During the construction, the elevation positioning shall be carried out at the four corners of the building and the elevator shaft, and the control points of the lower floor shall be measured upward by the laser verticometer during the construction of each floor.
2.
Errors should be avoided during the measurement and setting out of the formwork axis, and a special person must be organized to conduct technical review and acceptance after the measurement and setting out, and the subsequent formwork erection can be carried out only after it is confirmed to be correct.
7.
After the boom is extended or the main and auxiliary boom are all extended, the luffing shall not be less than the elevation angle specified for each length.
6.
When the water temperature of the internal combustion engine is 80 ~ 90 ℃, the lubrication performance is good.
13.
It is not allowed to damage the slope or collide with the support system or retaining pile to prevent collapse.
2.
10.
The submersible pump for foundation pit pumping and the power line should be well insulated and wired correctly.
5.
In the excavation process, if rock blasting is required, a special safety operation plan including charge calculation shall be formulated and submitted to the public security department for approval before blasting, and the transportation, requisition, storage and management of blasting equipment shall be strictly in accordance with the provisions of relevant blasting equipment.
2.
Ventilation, dust prevention, poison prevention and fire prevention measures shall be taken in the deep foundation pit.
During concrete pouring, they shall be poured evenly in layers around them.
During formwork erection, horizontal and vertical through lines shall be drawn, and vertical perpendicularity control lines shall be set to avoid deviation between the axis position of the building and the actual position of columns and walls.
The brushing of release agent shall be carried out after the residual concrete slurry on the formwork is removed.
11.
During the excavation of foundation pit, the anchor rod shall be pulled and fixed in time according to the design requirements.
It is strictly forbidden to measure upward layer by layer to prevent cumulative errors.
After the foundation pit is excavated to the design elevation, the pit bottom shall be fully closed in time, and the foundation construction shall be carried out in time to prevent the foundation pit from being exposed for too long.
At the same time, it is forbidden to use waste engine oil as the release agent, and chemicals such as soap liquid, talcum powder, lime water and so on shall be selected as the release agent.
12.
Formwork engineering and support system 1.
Sufficient elevation control points shall be set on each floor, the root of the vertical formwork shall be leveled, and the elevation mark shall be set on the top, and the construction shall be carried out in strict accordance with the mark.
5.
Although the formwork release agent is easy to brush, it is easy to cause pollution.
15.
The site where the crane travels and works shall be flat and solid, and a safe distance shall be maintained from the ditch and foundation pit.
2.
The load shall not exceed 20% of the rated lifting capacity under this working condition to prevent overload damage of the lifting mechanism or crane overturning accident.
4.
14.
8.
In order to avoid the safety risks of dangerous projects, construction enterprises should strengthen the safety management of divisional and subdivisional works of dangerous projects, carefully implement the safety production regulations and corresponding rules and regulations, strictly implement the supervision, timely summarize the relevant safety points, and effectively prevent the occurrence of safety production accidents.
When making the formwork, the moisture content of the formwork shall be strictly controlled, and the support at the junction of beams and columns shall be firm, and the formwork joints shall be tight without gaps, so as to avoid slurry leakage during concrete pouring.
When transporting soil by truck and shoveling soil by loader, there should be someone to command, obey the on-site traffic signs and instructions, and it is strictly forbidden to walk and carry vehicles around the foundation pit.
4.
Strictly implement the construction organization design and safety technical measures, and no unauthorized modification is allowed.
10.
The thickness of the decoration layer shall be considered when installing the stair step formwork.
During the operation, the principle of excavating layer by layer from top to bottom, sloping first, supporting first, and then excavating shall be adhered to.
The elevation of the building floor is controlled by the elevation of the first floor ± 0.000.
7.
3.
Entering the construction site must comply with the safety operation procedures and safety production disciplines.
Therefore, it should be painted evenly during the painting process, and the joint of reinforcement and concrete should not be polluted.
The release agent can be applied by brushing or spraying, but each layer should not be too thick, and the second layer should be applied as soon as possible before the first layer is fully cured, so as to make a good combination between the two, so as to avoid peeling and peeling due to the long curing time of the bottom layer.
Before the excavation of foundation pit, the geological, hydrological, road, nearby buildings, civil houses and other conditions should be checked and recorded.
8.
3.
When the water temperature does not reach 80 ℃, do not drive at high speed.
If any abnormality is found, emergency measures should be taken immediately.
Foundation Pit Engineering 1.
During construction, settlement joints shall be set correctly and the spacing of expansion joints shall be limited to avoid large cracks in the concrete structure beyond the specified range and affect the subsequent construction.
9.
3.
Hoisting and hoisting machinery installation and disassembly works 1.
The embedded parts and reserved holes shall be compared with the drawings before installation, and shall be accurately fixed at the design position after confirmation.
When pouring concrete, water should be poured in advance to ensure that the wood formwork is wet, so as to avoid the honeycomb, even holes, exposed reinforcement and other phenomena on the concrete surface caused by its expansion in subsequent works.
When abnormal phenomena such as crane inclination and unstable outriggers are found during operation, the crane shall immediately land under the heavy object in a safe area, and emergency braking shall not be used to avoid crane overturning accident..
During construction, grout stopping measures shall be taken at the splicing position, and foam double-sided adhesive tape shall be used to pad it between the formwork to ensure that the formwork splicing is seamless, tight and firm.
6.
3.
It is not allowed to over excavate without support.
5.
The formwork and support shall have sufficient rigidity, and the formwork structure shall be reasonable, so as to prevent cracking and concrete cracks caused by different deformation between the members of the formwork.
The changes should be observed frequently during the excavation process.
When the height of the building exceeds 30m, another elevation control line should be set, and there should be no less than 2 elevation measurement points on each floor for review.
11.
4.
1.
It is strictly forbidden to pile soil, materials and equipment under excessive load around the foundation pit, and it is not allowed to set up temporary shed facilities.
Before operation, it is necessary to comprehensively check whether the mechanical and electrical equipment of excavation meet the safety requirements, and whether the drainage, dewatering and water collection measures at the foundation pit site are implemented.
The upper part of the beam formwork and the wall formwork must be equipped with temporary bracing heads to ensure that the upper opening width of the beam and the wall is consistent during concrete pouring and tamping.
9.
When pumping, the operators in the pit should return to the ground, and the power supply must be cut off before moving the pump.
16.
