I. Quality requirements

1. When the reinforcement comes into play, the mechanical properties of the specimen should be tested according to the current national standards, and its quality must comply with the provisions of relevant standards.

2. All steel bars entering the site must carry certificates, signs and material reports in batches.

3. The steel products that have passed the supervision acceptance shall be placed according to the same batch of specifications and models, so as to avoid mistakes in blanking.

4. The surface of the steel bar should be clean. Before welding, the rust at the solder joint should be removed. If there is rust, the steel bar can be cold-drawn or derusted when straightening.

5. Reinforcement molding: the end of HPB235 grade reinforcement should be 180? The arc diameter of the hook should not be less than 2.5 times the diameter of the steel bar, and the length of the straight part of the hook after bending should not be less than 3 times the diameter of the steel bar. 2. When the design requires that the steel bar end should be 135? When the hook is bent, the inner diameter of HRB335 and HRB400 steel bars should not be less than 4 times the diameter of steel bars, and the length of the straight part after the hook is bent should meet the design requirements. 3. For general structure, the bending angle of stirrup hook should not be less than 90. Structures with seismic requirements should be 135? .

6. The welding quality of steel bars shall conform to industry standards and Standard for Test Methods of Welded Joints of Steel Bars.

Second, the quality and technical measures

1. Flash butt welding technology is adopted for steel bar welding in this project. In the process of flash butt welding, attention should be paid to the selection of flash allowance. The flash margin value of continuous flash butt welding is the sum of the severely flattened parts when two steel bars are cut off plus 8㎜, and the flash speed starts to approach zero from slow to fast, then it is about 1㎜/S, and finally reaches1.5 ~ 2 ㎜/s.

2. The upsetting allowance should be selected to make the welded joint of steel bar completely dense and produce certain plastic deformation. The allowance of high-grade or large-diameter steel bars should be 4 ~ 10 ㎜, which must be properly controlled during welding.

3. Upsetting speed should be as fast as possible, especially when upsetting starts at 0. 1S, the steel bar should be compressed for 2 ~ 3 ㎜, so that the welded joint can be closed quickly without oxidation, and then the power supply should be cut off, and upsetting will continue at a speed of 6㎜/S until the end.

4. Upsetting pressure should be enough to extrude all the molten metal out of the joint, and make the metal near the joint (about 10㎜) produce appropriate plastic deformation.

5. During the visual inspection of steel bar flash butt welding, there shall be no transverse crack at the joint, no obvious burn on the surface of the steel bar in contact with the electrode, the bending degree of the joint shall not be greater than 4, and the axis deviation of the steel bar at the joint shall not be greater than 0. 1 times the diameter of the steel bar, and shall not be greater than 2㎜.

6. Tensile and bending tests of steel bars on welded joints: The tensile strength of the three specimens should not be lower than the standard values of tensile and bending of steel bars of this grade. During construction, the simulated specimen should be tested first, and batch construction can be carried out only after it is qualified.

Third, the steel engineering

1. When installing reinforcement, the connection mode of longitudinal reinforcement should meet the design requirements, and the variety, grade, specification and quantity of reinforcement should meet the design requirements.

2. Steel bar joints should be set in places with less stress, and two or more joints should not be set for the same longitudinal reinforced bar. The distance from the end of the joint to the bending starting point of the steel bar should not be less than 10 times the diameter of the steel bar.

3. Reinforced joints set in the same component should be staggered, and the area percentage of longitudinal reinforced joints in the same level should meet the design and specification requirements.

4. The binding of adjacent longitudinal stressed steel bars in the same component should be staggered, and the transverse clear distance of steel bars in the binding joint should not be less than the diameter of steel bars and should not be less than 25mm.

5. After the reinforcement installation is completed, it shall be reported to the site supervisor for acceptance, and the next working procedure can be carried out only after it is qualified.

Fourth, the template project

1. Template installation quality requirements

(1) Before installation, pay off the template positioning foundation, center line and position, and use lines to pop up the inner edge and center line of the template, which is convenient for template installation and correction.

(2) Do a good job in elevation measurement, and use a level to guide the horizontal elevation of the building to the template installation position.

(3) The soil ground supporting the pillar should be tamped and leveled in advance, and waterproof and drainage settings should be made, and the bottom of the pillar should be padded with boards.

(4) The formwork shall be coated with release agent, and the structural surface shall be treated. It is forbidden to coat waste engine oil on the formwork.

2. Quality assurance measures

(1) The formwork shall be assembled according to the design of distribution board before installation to ensure the overall stability of the formwork system.

(2) The accessories must be inserted firmly, and the bearing surfaces under the pillars and braces should be flat and padded, with sufficient compression area.

(3) The reserved holes of embedded parts must be located correctly and installed firmly.

(4) The foundation formwork must be firmly supported to prevent deformation, and the bottom of the side formwork diagonal brace should be padded.

(5) the bottom of the wall column template should be flush with the upper end, and the upper end should be aligned with the positioning datum prepared in advance. Template should have reliable support points, and correct its straightness.

Five, template removal

1. The sequence and method of formwork dismantling shall be carried out in accordance with the provisions of distribution board design, and the principle of supporting first and then dismantling, non-bearing part first, bearing part later and top-down. It is forbidden to pry open the template with a sledgehammer and crowbar.

2. Dismantle the side formwork first, and then dismantle the bearing formwork.

3. The combined template should be removed in large pieces.

4. The supports and connectors shall be removed together with the parts, and the formwork shall be removed together with the blocks, and the formwork and concrete shall not be damaged during removal.

5. Dismantled templates and accessories should be classified and neatly stacked, and accessories should be placed in the toolbox.

Six, quality requirements

1. When pouring concrete, the uniformity and compactness of concrete should be controlled. After the concrete mixture is transported to the pouring place, it should be poured immediately. If the uniformity and consistency of the concrete mixture are found to have changed greatly, it should be handled in time.

2. When pouring concrete, attention should be paid to prevent concrete delamination and segregation. When concrete is discharged from the hopper and funnel for pouring, its free inclination angle should generally not exceed 2M, and the height of pouring concrete in the vertical structure should not exceed 3M.

3. When pouring concrete, observe the conditions of templates, supports, steel bars, embedded parts and reserved holes at any time. When deformation or displacement is found, pouring should be stopped immediately, and the poured concrete should be fixed before it sets.

4. In the process of concrete pouring and standing, measures should be taken to prevent cracks. Non-structural surface cracks caused by settlement and drying shrinkage of concrete should be repaired before final setting of concrete.

Seven, quality assurance measures

1. Obtain the mixture ratio from the laboratory according to the design requirements, and convert the construction mixture ratio into the mixture ratio according to the moisture content of sand and gravel on site.

2. Before pouring concrete, steel bars, templates and other engineering projects should be concealed and accepted in advance, and pouring can only be carried out after the acceptance of supervision.

3. The sequence of mixing and loading is gravel → cement → sand. Before mixing concrete with concrete mixer every time, start the mixer to run idle, and then add materials and stir after it is normal. When mixing is started according to the new mixture ratio, when the raw materials change, attention should be paid to the unpacking appraisal and test work before mixing.

4. The mixing time starts from the time when all raw materials are put into the mixing barrel to the time when the concrete mixture is discharged, and the shortest time is 90 seconds, so as to ensure that all components of the mixed concrete are evenly mixed and have the same color.

5. Before pouring concrete, the garbage, wood tips, dirt and oil stains on steel bars in the formwork shall be cleaned up, and the wooden formwork shall be watered and wetted, but there shall be no water.

6. When pouring concrete, ensure uninterrupted water, electricity and lighting, and check it before pouring. Engineering materials required before pouring or pouring to construction joints shall be prepared at the pouring site to prevent accidental shutdown or shutdown.

7. In the concrete pouring stage, we should master the changes of concrete, especially in the thunderstorm and cold current. Ensure the continuous pouring sequence of concrete and ensure the quality of concrete.

Eight, construction preparation

The foundation concrete project adopts on-site mixing, and the tower crane transports it to the pouring site. On-site mechanical equipment: tower crane 1 set, concrete mixer 1 set, and 2 concrete plug-in vibrators.

Labor force: 8 rebar workers, formwork workers 10, 20 geotechnical workers, and general workers 10.

Materials: ordinary portland PO32.5 cement is used as the cement.

Pebbles are pebbles with a particle size of 2 ~ 4 ㎝.

Sand adopts water sand.

Water is drinking water.

Nine, the construction progress

The progress of this foundation project is as follows:

1. Reinforcement Fabrication 2004 1 1.02

2. Concrete pouring: June 65438+1October 365438+1October 2004

3. Template installation and removal: June 2004165438+1October 0 1

4. Backfilling of foundation: June 5438+065438+1October 9, 2004.

X. Safety measures

The following points should be paid attention to when processing steel bars:

1. The length of the working platform and the lower part of the cutter to keep the horizontal working point when cutting steel bars shall be set according to the length of the processed material.

2. When the machine reaches normal operation, it is not allowed to cut materials. When cutting materials, you must use the small and medium parts of the tool. When grasping the steel bar and quickly putting it into feeding, hold the steel bar tightly and press it on the side of the fixed blade to prevent the steel bar from popping up and hurting people.

3. Do not shear the rebar and red-hot rebar whose diameter and strength exceed the rating of mechanical nameplate.

4. In the process of steel bar straightening, the end of straightening block is not fixed, and the material can be received only after the end of protective cover is covered. During operation, it is forbidden to open the protective cover of each component and adjust the gap.

5. When the steel bar is locked, the hand and the wheel must keep a certain distance, and shall not be close to each other.

6. When the steel bar is bent, the mandrel, iron retaining shaft and turntable of the bending machine should be free of cracks and damage, and the protective cover should be firm and reliable. After confirming that the idling is normal, the operation can be started.

7. It is forbidden to change the shaft core, pin shaft, change the angle and speed regulation during operation, and it is also forbidden to clean and refuel.

XI。 Precautions for template installation and removal:

1. When disassembling the template, someone should meet from top to bottom, and the moving parts should be firmly fixed. It is forbidden to pile up and throw on the scaffold board.

2. When disassembling the template, a firm climbing tool must be used, and the operator should wear a seat belt when working high above the ground.

3. After the formwork and accessories are dismantled, bonding mortar shall be removed in time. Deformed and damaged templates and accessories must be repaired, and templates and accessories with unqualified maintenance quality shall not be used.

4. 36V low-voltage power supply or other effective safety measures should be adopted for the wires erected on the formwork and the electric tools used.

5. When working high above the ground, all kinds of accessories should be placed in the toolbox or tool bag, and it is strictly prohibited to put them on the template or scaffold. All kinds of tools should be hung on the operator or put in the tool bag, and must not fall off.

6. After the strength of the concrete to be poured reaches 1.2N/㎜2, pedestrians and templates can be installed on it.

7. Covering watering and curing of concrete shall be carried out within 12 hours after pouring, so as to ensure that the concrete is fully wet.

8. Water conservation time shall not be less than 7d.

9. In the process of concrete curing, if it is found that the cover is not good, the water is insufficient, the surface is white or small cracks appear due to drying shrinkage, it should be carefully covered immediately, the curing work should be strengthened, the curing date should be fully watered, and the remedy should be carried out.

Foundation engineering construction scheme

A, the construction specification requirements

1, the construction unit should carry out the whole process quality control of production control and qualification control. The quality management of the construction site requires corresponding construction technical standards, a sound quality management system, construction quality control and quality inspection system, and an approved construction organization design and construction technical scheme for specific construction projects.

2. When the reinforcement comes into play, the mechanical properties of the specimen shall be tested according to the current national standards, and its quality must comply with the provisions of relevant standards.

All steel bars entering the site must carry certificates, signs and material reports in batches.

3. The steel products that have passed the supervision acceptance shall be placed according to the same batch of specifications and models, so as to avoid mistakes in discharging.

4, steel surface should be clean, before welding, the rust at the solder joints should be removed. If there is rust, steel bars can be cold-drawn or derusted when straightening.

5. Reinforcement molding: the end of HPB235 grade reinforcement should be 180? The inner diameter of the hook should not be less than 2.5 times the diameter of the steel bar, and the length of the straight part of the hook after bending should not be less than 3 times the diameter of the steel bar. 2. When the design requires that the steel bar end should be 135? When the hook is bent, the inner diameter of HRB335 and HRB400 steel bars should not be less than 4 times the diameter of steel bars, and the length of the straight part after the hook is bent should meet the design requirements. 3. For general structure, the bending angle of stirrup hook should not be less than 90. Structures with seismic requirements should be 135? .

6. The welding quality of steel bars shall conform to industry standards and Standard for Test Methods of Welded Joints of Steel Bars.

Second, the number of projects and the organization of construction personnel, machinery and materials

1. The main building foundation concrete of this project is about 1320 cubic meters, the podium concrete is about 500 cubic meters, the main building reinforcement is about 100 tons, and the podium concrete is about 20 tons.

2, according to the size of the quantity, ready to organize carpentry 30 people, 25 steel workers, pouring concrete.

There are 30 workers and 5 to 7 technicians, and the construction team is well organized.

3. According to the actual construction situation of this project, the mechanical equipment includes: a 500 concrete mixer, a steel bar forming machine, a flash butt welder, a steel bar bending machine, a cutting machine, a woodworking saw and a planer. Because no tower crane was installed, three motor tricycles were equipped for transportation. The main building is equipped with four Luoyang shovels, five small windmills and one low-voltage transformer.

4. Prepare 500 tons of cement, 600 cubic meters of medium sand, stones 1300 cubic meters, square timber 1000 cubic meters, bamboo plywood 1000 square meters, steel bars 130 tons, 7 tons of steel pipes, 5,000 fasteners and various odds and ends.

Third, quality assurance measures

1, according to the specification and design requirements, use theodolite to control the axis, pile position and foundation sideline, the elevation shall be measured to the foundation pit wall according to the absolute elevation provided by Party A, and the horizontal control pile is the only horizontal control pile for the whole building foundation.

2, according to the requirements of drawings, release the foundation sideline, self-check the pile position, check the axis size, and report to the inspection supervision department for line inspection after passing the inspection. After inspection, foundation excavation and pile hole excavation shall be carried out.

3. When excavating the foundation and pile position, assign special personnel to follow the class to control the foundation elevation, hole depth, pile diameter and foundation size.

4. The foundation excavation of the podium is strictly controlled at the design elevation of +300.

5. After the earthwork excavation of the independent foundation, the sand cushion with the thickness of 100mm shall be laid according to the design requirements. The thickness of sand cushion is not more than 0.9, and then it is vibrated with a flat vibrator.

6. Make the foundation C 10 concrete cushion. When pouring the cushion, control the elevation, level the surface, and dry the surface until the water is collected.

7, the main building into a hole in strict accordance with the construction specifications.

8, sediment should be put into the reinforcing cage, before concrete pouring for secondary cleaning, its thickness shall not be greater than the specification.

9. According to the requirements of the drawings, the static pressure value of the pile with enlarged head and tail shall be not less than 800mm, which shall be well matched with the geology and designed as a slot inspection.

10, reinforcement engineering

(1) When installing reinforcement, the connection mode of longitudinal reinforcement shall meet the design requirements, and the variety, grade, specification and quantity of reinforcement shall meet the design requirements.

(2) Steel bar joints should be set in places with less stress, and two or more joints should not be set for the same longitudinal steel bar. The distance from the end of the joint to the bending starting point of the steel bar shall not be less than 10 times the diameter of the steel bar.

(3) The rebar joints set in the same component should be staggered, and the area percentage of longitudinal stressed joints in the same level should meet the design and specification requirements.

(4) In the same component, the binding of adjacent longitudinal stressed steel bars should be staggered, and the transverse clear distance of steel bars in the binding joint should not be less than the diameter of steel bars, and should not be less than 25mm.

⑤ After the installation of steel bar is completed, it shall be reported to the site supervisor for acceptance, and the next working procedure can be carried out only after it is qualified.

1 1, formwork engineering

(1) Before installation, pay off the template positioning foundation, center line and position, and use lines to pop up the inner edge and center line of the template, which is convenient for template installation and correction.

(2) Do a good job in elevation measurement, and use a level to guide the horizontal elevation of the building to the template installation position.

(3) The soil ground supporting the pillar should be tamped and leveled in advance, and waterproof and drainage settings should be made, and the bottom of the pillar should be padded with boards.

(4) The formwork shall be coated with release agent, and the structural surface shall be treated. It is forbidden to coat waste engine oil on the formwork.

⑤ Before the formwork is installed, it should be assembled according to the design order of the distribution board to ensure the overall stability of the formwork system.

⑥ The connectors must be inserted firmly, and the supporting surfaces under the pillars and supports should be smooth and padded, with sufficient compression area.

⑦ The reserved holes of embedded parts must be located correctly and installed firmly.

Today the foundation formwork must be firmly supported to prevent deformation, and the bottom of the side formwork support should be padded.

Pet-name ruby wall column template bottom should be flush with the top, should be aligned with the positioning datum prepared in advance, close to the cushion layer, the template should have reliable support points, and its straightness should be corrected.

12, template removal

(1) The order and method of formwork dismantling shall be carried out in accordance with the provisions of the distribution board design, following the principle of first supporting and then dismantling, first non-load-bearing part, then load-bearing part, and top-down principle. It is forbidden to pry with a sledgehammer and crowbar when dismantling formwork.

(2) Dismantle the side formwork first, and then dismantle the bearing formwork.

(3) The combined formwork shall be dismantled in large pieces as a whole.

(4) The supports and connectors shall be removed together with the parts, and the formwork shall be removed together with the blocks, and the formwork and concrete shall not be damaged during removal.

⑤ The removed templates and accessories should be classified and neatly stacked, and the accessories should be placed in the toolbox.

13, concrete pouring project

(1) When pouring concrete, the uniformity and compactness of concrete should be controlled. After the concrete mixture is transported to the pouring site, it should be poured immediately. If the uniformity and consistency of concrete mixture are found to have changed greatly during pouring, it should be handled in time.

(2) When pouring concrete, attention should be paid to prevent concrete from delamination and segregation. When concrete is discharged from the hopper and funnel for pouring, its free inclination angle should generally not exceed 2M, and the height of pouring concrete in the vertical structure should not exceed 3M.

(3) When pouring concrete, observe the conditions of formwork, support, steel bar, embedded parts and reserved holes from time to time. When deformation and displacement are found, pouring should be stopped immediately, and the poured concrete should be repaired before setting.

(4) In the process of pouring and static concrete, measures should be taken to prevent cracks. Non-structural surface cracks caused by settlement and drying shrinkage of concrete should be repaired before final setting of concrete.

Fourth, security measures.

The following points should be paid attention to when processing steel bars:

1. The length of the working platform and the lower part of the cutter to keep the horizontal working point when cutting steel bars shall be set according to the length of the processed material.

2. When the machine reaches normal operation, it is not allowed to cut materials. When cutting materials, you must use the small and medium parts of the tool. When grasping the steel bar and quickly putting it into feeding, hold the steel bar tightly and press it on the side of the fixed blade to prevent the steel bar from popping up and hurting people.

3, shall not be shear diameter and strength more than mechanical nameplate rated steel bar and red-hot steel bar.

4, steel bar in the process of straightening, straightening block at the end of the fixed, cover at the end of the cover shall not be closed, homework it is forbidden to open the ministries cover and adjust the gap.

5, when the steel bar in, hand and wheel must keep a certain distance, shall not be close to.

6, steel bending, bending movement shaft, iron shaft, turntable, etc. There should be no cracks and damage, and the protective cover should be firm and reliable. It can only be operated after idling is confirmed to be normal.

7. During operation, it is forbidden to change the shaft core and pin shaft, change the angle and speed adjustment, or clean and refuel.

(2) Precautions for template installation and removal:

1, when disassembling the template, someone should meet up and down, run with the disassembly, and the moving parts should be fixed firmly. It is forbidden to pile up and throw on the scaffold board.

2, disassembling template, must use solid climbing tools, aerial work, the operator should hang up your seat belt.

3. After the formwork and accessories are dismantled, bonding mortar shall be removed in time. Deformed and damaged templates and accessories must be repaired, and templates and accessories with unqualified maintenance quality shall not be used.

4. 36V low-voltage power supply or other effective safety measures should be adopted for the wires erected on the formwork and the electric tools used.

5, climbing, all kinds of accessories should be put in the toolbox or tool bag, it is forbidden to put on the template or scaffolding, all kinds of tools should be hung on the operator, or put in the tool bag, shall not fall.

6. After the strength of the concrete to be poured reaches 1.2N/㎜2, pedestrians and templates can be installed on it.

7. Covering watering and curing of concrete shall be carried out within 12 hours after pouring, so as to ensure that the concrete is fully wet.

8, water conservation time shall not be less than 7 d. ..

9, concrete in the process of curing, such as found that the coverage is not good, insufficient water, so that the surface is white or small cracks, should be carefully covered immediately, strengthen the maintenance work when covering, fully water and extend the curing date to remedy.

Flash butt welding technology is adopted for steel bar welding in this project. In the process of flash butt welding, attention should be paid to the selection of flash allowance. The flash margin value of continuous flash butt welding is the sum of the severely flattened parts when two steel bars are cut off plus 8㎜, and the flash speed starts to approach zero from slow to fast, then it is about 1㎜/S, and finally reaches1.5 ~ 2 ㎜/s.

1. The upsetting allowance should be selected so that the reinforced joint is completely closed and produces certain plastic deformation. The allowance should be 4 ~ 10 ㎜ high-grade or large-diameter steel bars, which must be properly controlled during welding.

2. Upsetting speed should be as fast as possible, especially when upsetting starts at 0. 1S, the steel bar should be compressed for 2 ~ 3 ㎜, so that the welded joint can be closed quickly without oxidation, and then the power supply should be cut off, and upsetting will continue at a speed of 6㎜/S until the end.

3. Upsetting pressure should be enough to extrude all molten metal from the joint, and make the metal near the joint (about 10㎜) produce appropriate plastic deformation.

4. During the visual inspection of steel bar flash butt welding, there shall be no transverse crack at the joint, no obvious burn on the surface of the steel bar in contact with the electrode, the bending degree of the joint shall not be greater than 4, and the axis deviation of the steel bar at the joint shall not be greater than 0. 1 times the diameter of the steel bar, and shall not be greater than 2㎜.

5. Tensile and bending tests of steel bars on welded joints: The tensile strength of the three specimens should not be lower than the standard values of tensile and bending of steel bars of this grade. During construction, the simulated specimen should be tested first, and batch construction can be carried out only after it is qualified.

Construction Scheme (Masonry of Building No.8)

Luoyang Jiudu Chunbao Building No.8 is a comprehensive office building invested and developed by Shangcheng Real Estate Co., Ltd., which is a three-story frame building integrating business office, kindergarten and hospital. The inner wall is made of 200-thick aerated concrete blocks, while the outer wall was originally designed as 240-thick aerated concrete blocks. As Party A proposed to reduce doors and windows and increase walls, after design review, the number of external wall aerated blocks was changed from 240 to 200, and the total number of aerated concrete blocks was about 260m3. The bulk density is 533kg/m3, and the reinforcement is? 6.5@500 first gear, planting steel bars in the field, and the Rachel strength of planting steel bars meets the requirements.

A, construction preparation:

1. On-site aerated block, sand and cement can be used in the project only after passing the second interview.

2. Check the installation of mortar machine and hoist before use.

3. Check whether the axis and elevation are correct.

4. Some shovels, ropes, rope hammers and tile knives.

Second, the operation process:

1. Dry pendulum brick, the brick specification is 600× 200× 240; Check whether the bricks are placed correctly.

2. Mortar shall be stirred in strict accordance with the mixing ratio, which is cement: sand: water: gypsum (1: 5.04: 1.42: 0.35). Mortar shall be used up within 2 hours after mixing, and shall not be directly poured on the floor.

3. Aerated blocks cannot be directly cut with tile cutter. Saw the aerated block with a woodworking saw.

4. Each floor-build by laying bricks or stones three small bricks first, then build by laying bricks or stones aerated blocks, and build by laying bricks or stones solid bricks on both sides of the windowsill.

5. The wall reinforcement has been inserted as required. If it is exposed, it must be filled in, with a length of not less than 1.00 and not less than 1/5 wall length.

6. No frame holes shall be left in the masonry.

7. The block should be properly watered, not too much water.

8. Masonry should not be less than 1/3 of the length of masonry, and the upper and lower mortar joints should be staggered.

Third, the quality requirements:

1. Masonry horizontal mortar plumpness is not less than 90%, and vertical mortar joint plumpness is not less than 80%.

2. The thickness of mortar joint is 10~ 15mm, and both sides of vertical joint are clamped with formwork, and the mortar should be dense, and the vertical mortar joint is not more than 20 mm ..

3. Allowable deviation:

Axis displacement: 10 verticality: 5 surface flatness: 5

Up-and-down displacement of external wall window: 15 Windows and doors opening: 5.

Fourth, finished product protection:

1. When building walls, clean them up.

2. Mortar should not collide with walls and columns.

Don't bump into the wall and post when pushing the cart.

4. Clean up after work.

Verb (abbreviation for verb) safety requirements:

1. Before operation, you must check whether the environment and machinery are safe.

2. When the height of the wall exceeds 1.2m, scaffolding must be erected, and bricks shall not be piled on the scaffolding, and the same scaffolding shall not exceed two people.

3. Enter the construction site, fasten your seat belt and wear safety helmet.

Don't throw things on the floor in case of injury.

I sent it to you. . . . Change it according to the actual situation. .