It is strictly prohibited to fill wood boards, asbestos tiles and other sundries behind the shotcrete.
Click the blue word to pay attention to the first red line of our house construction category: the construction organization design of the special scheme with high risk for project implementation and the special scheme with high risk 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.
2.
When pouring concrete for hole digging pile (dry pouring method), tumbling barrel must be used.
In the process of receiving, distribution and recycling, it must be registered and signed.
Article 8: concrete works} 1.
Except for the specially designed shaped formwork system, in any case, the spacing of split screws must be less than or equal to 500mm.
4.
The top of the column at the bottom of the jacking shall be provided with a horizontal bar along the vertical and horizontal direction.
The outer frame system must have implementable and effective construction drawings.
Article 4: concrete works 1.
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The safety step of tunnel initial support, inverted arch and secondary lining construction shall strictly comply with the requirements of industry specifications or local competent authorities.
The step distance shall not exceed 1.5m.
Samples must be taken on site to make test blocks, which shall be cured and submitted for inspection according to the specification requirements.
Article 7: reinforcement works {1.
2.
The chief engineer of the company must organize joint review for the special scheme with high risk exceeding a certain scale.
Cement mortar cushion blocks or plastic cushion blocks must be used (except specially made cushion blocks under special circumstances).
3.
Article 3: formwork system 1.
The formwork system must have implementable and effective construction drawings.
The horizontal sealing 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 no more than 10m and no more than three layers must be completely closed.
Load bearing running test must be conducted before beam erection.
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The over excavated part of the tunnel must be backfilled tightly, and it is strictly prohibited to have holes behind it.
The support system for cast-in-situ beam construction must have special design and calculation, and the support must be preloaded after erection.
Adopt three-level distribution and two-level leakage protection system.
When the grade of surrounding rock changes, communicate with the designer and supervisor in time, conduct on-site appraisal, and change the construction method after determining the change opinions.
Article 2: Bridge Engineering} 1.
The support system of the post cast strip must be set separately, and it is strictly prohibited to return to the top after removal.
2.
The chief engineer of the company must organize joint review for the special scheme with high risk exceeding a certain scale.
Article 3: tunnel engineering} 1.
2.
All construction joints, wet joints, post cast strips and beam ends must meet the design requirements and be washed clean.
There must be a special and effective repair scheme for concrete defects, which shall be carefully implemented in strict accordance with the scheme.
4.
The lessee’s procedures must be complete and effective; The installation, jacking and demolition workers must have one person and one certificate.
In the process of tensioning and grouting, the whole process must be supervised.
2.
The cantilever beam of the cantilever frame must adopt no less than 16 national standard I-beam, the diameter of the cable-stayed steel wire rope shall not be less than 14, and the cantilever height of each time shall not exceed 20m.
The pier and abutment body formwork system must have design and processing drawings and calculation instructions.
Tunnel excavation must be carried out in accordance with the design requirements, and the excavation method shall not be changed without approval.
The construction scheme must be prepared by the construction party and submitted to the general contractor for approval after being approved by the chief engineer of the construction party.
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.
Cement mortar cushion block or plastic cushion block must be used for reinforcement cushion block.
Article 1 of the red line for infrastructure: for special schemes with high risks, the project implementation construction organization design and special schemes with high risks 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.
Article 5: reinforcement works {1.
5.
Beam transportation and erection construction: the bridge erecting machine can only be used after being accepted by the local safety supervision department.
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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.
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Article 6: high risk equipment 1.
It is strictly prohibited to stay overnight on site..
When the bridge is prestressed, it can be tensioned or released only when the concrete strength meets the design requirements.
Article 5: power consumption system {1.
2.
The reinforcement connection must be managed according to the special process to ensure that it meets the specification requirements.
The remaining initiating explosive devices on site shall be kept in the warehouse.
2.
The guide rail or guide rod of the integral lifting frame must have three reliable wall connection points.
4.
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 double safety ropes must be used for personnel up and down.
Article 6: power system 1.
The floor concrete must be vibrated with a plate vibrator; There shall be at least 7 days of effective curing time for vertical members after formwork removal.
The roughening treatment of construction joints must be carried out after the final setting of concrete and cleaned before entering the next process.
After the completion of all concrete leveling, the surface must be closed for many times to ensure that there are no cracks on the surface, and the effective curing period shall not be less than 7 days.
The electric welding machine must be equipped with secondary step-down protector (including electroslag pressure welding machine).
The reinforcement connection must be effectively managed according to the special process and ensure that it meets the specification requirements.
The action current of leakage protector in 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.
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The bottom surface of tumbling barrel shall be less than 1m from the concrete surface, and the concrete shall be vibrated in layers.
Article 2: technical data all technical data must be formed by the corresponding responsible person, and outsourcing is strictly prohibited.
TN-S neutral protection system must be adopted.
3.
Article 7: the storage of initiating explosive devices and the warehouse of initiating explosive devices must be attended by more than 2 employees with legal labor relations for 24 hours, who have been trained and work with certificates.
Article 4: outer frame system 1.
