Article 2: Bridge Engineering 1.
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Article 6: high risk equipment (tower cranes, people and goods elevators, material hoists, etc.) 1.
It is strictly forbidden to stay overnight on site..
3.
The pier and abutment body formwork system must have design and processing drawings and calculation instructions.
When the bridge is prestressed, it can only be tensioned or released after the concrete strength meets the design requirements.
The formwork system must have implementable and effective construction drawings.
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Article 6: power system 1.
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All side beam support systems must be connected with the inner frame as an organic whole, and it is strictly prohibited to support on the outer frame.
Article 4: outer frame system 1.
The chief engineer of the company must organize a joint review for special schemes with greater risks that exceed a certain scale.
Load bearing running test must be carried out before beam erection.
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Cement mortar cushion blocks or plastic cushion blocks must be used for reinforcement cushion blocks.
Article 7: the storage of initiating explosive devices the warehouse of initiating explosive devices must be attended by more than 2 employees with legal labor relations for 24 hours, and they must be trained and certified.
Article 2: technical data all technical data must be formed by the corresponding responsible person, and outsourcing is strictly prohibited.
Article 4: concrete works 1.
Article 8: concrete works 1.
The horizontal closure of the outer frame must meet the following requirements: the operation layer and the next layer of the operation layer, the first layer of the cantilever frame (climbing frame), the second layer of the floor frame, and the middle layer not more than 10 meters and not more than three layers must be completely closed.
2.
The remaining initiating explosive devices on site must be kept in the warehouse.
5.
When pouring concrete for dug piles (dry pouring method), tumbling barrels must be used.
The reinforcement connection must be effectively managed according to the special process and ensure that it meets the specification requirements.
The first red line of infrastructure: the implementation construction organization design of the project with high risk and the special plan with high risk must be approved in strict accordance with the procedures, and the project manager must organize the joint review of the project to ensure its operability.
Cement mortar cushion blocks or plastic cushion blocks must be used (except for specially made cushion blocks under special circumstances).
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2.
The distance between the bottom of tumbling barrels and the concrete surface is less than 1 meter, and the concrete should be vibrated in layers.
The construction scheme must be prepared by the construction party, and the chief engineer of the construction party must submit it to the general contractor for approval after approval.
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The chiseling treatment of construction joints must be carried out after the final setting of concrete and cleaned before entering the next process.
4.
When the grade of surrounding rock changes, it is necessary to communicate with the designer and supervisor in time, conduct on-site appraisal, and change the construction method after determining the change opinions.
2.
The action current of the leakage protector of the distribution box is 150mA, and the action time is 0.2S; The action current of the leakage protector of the switch box is 15mA or 30mA, and the action time is 0.1s.
Three level power distribution and two-level leakage protection system are adopted.
The lessee’s procedures must be complete and effective; The installation, jacking and demolition workers must have one person and one certificate.
The electric welding machine must be equipped with a secondary step-down protector (including electroslag pressure welding machine).
The support system of the post cast strip must be set separately, and it is strictly forbidden to return to the top after removal.
Transportation and erection of beams: the bridge erecting machine can only be used after being accepted by the local safety supervision department.
The excavation pile operation must be protected by the wall, and the wellhead must be set with a concrete lock 30cm higher than the ground, and personnel must use double safety ropes up and down.
The step distance shall not exceed 1.5m, and the top of the column at the bottom of the jacking shall be set with a horizontal bar along the vertical and horizontal direction.
3.
The leakage action current of the leakage protector of the general distribution box is 150mA, and the action time is 0.2S; The leakage action current of the switch box is 15mA or 30mA, and the action time is 0.1s.
Article 3: formwork system 1.
The outer frame system must have implementable and effective construction drawings.
3.
Except for the specially designed stereotyped formwork system, in any case, the distance between the pull screws must be less than or equal to 500mm.
Samples must be taken on site to make test blocks, which shall be cured and submitted for inspection according to the specification requirements.
2.
There must be a special and effective repair plan for concrete defects, which must be carefully implemented in strict accordance with the plan.
Article 5: reinforcement works 1.
Slab concrete must be vibrated with a plate vibrator; There must be at least 7 days of effective curing time for vertical members after formwork removal.
In the process of receiving, distributing and recycling, it must be registered and signed.
Tunnel excavation must be carried out in accordance with the design requirements, and the excavation method shall not be changed without approval.
The reinforcement connection must be managed according to the special process to ensure that it meets the specification requirements.
The construction support system of cast-in-place beam must have special design calculation, and the support must be preloaded after erection.
Article 7: reinforcement works 1.
After the completion of all concrete flattening, the surface must be finished for many times to ensure that there is no crack on the surface, and the effective curing period is not less than 7 days.
2.
The safe step distance of tunnel initial support, inverted arch and secondary lining construction shall strictly comply with the requirements of industry specifications or local competent departments.
Article 1 of the red line for housing construction: the construction organization design of the high-risk special scheme for the implementation of the project and the high-risk special scheme must be approved in strict accordance with the procedures, and the project manager must organize the joint review of the project and ensure its enforceability.
TN-S neutral protection system must be adopted.
Article 3: Tunnel Engineering 1.
4.
All construction joints, wet joints, post cast strips and beam end chiseling must meet the design requirements and be washed clean.
It is strictly forbidden to fill wood boards, asbestos tiles and other debris behind the sprayed concrete.
The chief engineer of the company must organize a joint review for special schemes with greater risks that exceed a certain scale.
2.
Article 5: power consumption system 1.
The guide rail or guide rod of the integral lifting frame must have three reliable wall connection points.
The over excavated part of the tunnel must be backfilled tightly, and it is strictly forbidden to have holes behind it.
The cantilever beam of the cantilever frame must adopt the national standard I-beam of no less than 16, the diameter of the cable-stayed wire rope shall not be less than 14, and the cantilever height of each time shall not exceed 20 meters.
In the process of tensioning and grouting, the whole process must be supervised by standing by.
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