2.
4.
The most important item is the inspection of formwork reinforcement, and the tie rod must be used φ 16 above, the bottom formwork must be reinforced with double nuts, check the stress mode of the formwork, and add necessary top support steel pipes, especially on both sides and ends, to avoid formwork expansion and formwork explosion.
The main reinforcement or horizontal reinforcement shall be welded to the support reinforcement, densified at the position of 1m-2m and fixed firmly; 9.
The surface of the template must be painted with release agent or oil (prohibit the use of waste oil) or oil and diesel mixture.
Box culvert construction III.
The debris, powder and garbage generated after roughening shall be cleaned up, otherwise the concrete shall not be reported for issuance; 2.
For the verticality inspection of the culvert wall formwork (hanging with a plumb hammer), it is required to check three sides, namely, the inside, outside and the side of the settlement joint.
other inspection 1.
The pipe section with reinforcement leakage is not allowed to be used on the construction site.
Check whether there is reinforcement leakage inside the pipe section of circular pipe culvert.
Before erecting the formwork, the construction team shall be required to roughen the concrete joint surface.
The roughening standard has been issued to all construction teams and technicians.
H is the height of culvert abutment; 5.
The formwork shall not be staggered, otherwise the formwork shall be spliced again until there is no dislocation.
The concrete joint surface shall be roughened; 2.
For the linear control of formwork, the line must be checked to ensure the linearity is smooth and straight; 3.
Allowable range of staggering at the bottom of adjacent pipe joints: 1) 3mm when the pipe diameter is less than or equal to 1m; 2) 5mm for pipe diameter greater than 1m; Circular pipe culvert construction ~ ~ recommended reading ~ ~ project visa, progress payment, settlement review, these key points must be mastered! What are the six problems that should be solved in the implementation of list quotation? What is the preparatory work? What is the impact of canceling the approval of project cost qualification on the industry?..
The project department requires that the upper and lower height difference be controlled within 10mm, and the specification requires 0.3% H.
The pipe joint of circular pipe culvert must correspond to the settlement joint.
4.
The protective layer of reinforcement must meet the design value, which is within the specification requirements and ± 5mm.
Template inspection: 1.
Reinforcement model, quantity and spacing (the quantity of reinforcement directly affects the spacing of reinforcement); Two.
The elevation problem shall be controlled by itself to avoid major problems (the simplest inspection method is to measure the distance between the concrete surface and the abutment cap with a tape or tower ruler to see whether it meets the design clear height); 10.
It is forbidden to use mud and soil; 6.
Special attention shall be paid to that the width between the platform caps shall be 5cm larger than the length of the designed cover plate (to avoid that the cover plate cannot be put down); 7.
4、 Quality control of circular pipe culvert 1.
Template check before culvert concrete pouring.
Effective measures shall be taken to block the bottom, side and tie rod eyes of the formwork to prevent honeycomb and pitted surface caused by slurry leakage; Measures include mortar and double-sided adhesive tape.
The height of the abutment cap is also recommended to be 1-2cm higher than the design; 8.
1、 Reinforcement inspection 1.
3.
Pay special attention to the inspection of the side of the settlement joint, which will directly affect the later installation of the cover plate.
For concrete curing, measures shall be taken immediately after formwork removal, and the curing shall be carried out in strict accordance with the quality requirements documents.
Check that the clear hole distance of the culvert is not less than the design value, that is, the distance between the inner formwork on both sides is not less than the design value.
