What should be paid attention to in the construction of bridge piers

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The main quality standards and main construction precautions for the construction of pro-bridge piers are as follows: measurement and positioning 1), before the pier body template is assembled, the measurement class should be accurately measured and released; 2) After the completion of the vertical mold, the measurement team should open the Tongran to measure and review the pier body template; The connection part of the cushion cap and the pier body should be chiseled with a pickaxe, and the fresh concrete bedrock surface should be exposed, and the debris or garbage at the bottom must be cleaned up before the vertical mold and the concrete is poured, and the concrete can be poured only after being moistened with water. The reinforcement protective layer cushion block must be provided with the cushion block whose strength, compactness and durability meet the requirements of high-performance concrete on the pier body reinforcement, and the size of the cushion block should meet the design and specification requirements, and be completed before the formwork is installed.

The number of cushion blocks should meet the requirements of 4, and the protective layer cushion blocks of top cap reinforcement should be properly encrypted and laid. The definition of cap beam refers to the cross beam set at the top of the row frame pile pier for supporting, distributing and transmitting the load of the superstructure. Which quality control of the cap beam wheel is aware of the cross-sectional size of the key points of the virtual system:

5mm,-8mmTop elevation: 10mm Vertical and horizontal axis displacement: 8mm, I hope mine can help you <>

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Content from user: Zhong Jian.

Directory. First, the general situation of the project - 3 -1, the basis of preparation - 3 -2, the project content - 3 - 2, the construction organization - 3 -1, the project organization and personnel readiness - 3 -2, the preparation of equipment and materials - 4 -3, the specific construction organization - 5 -4, the construction arrangement - 6 - 3, the construction process description - 6 - 4, the specific construction plan - 8 - (1) construction preparations - 8 - (2) rectangular and circular column pier construction - 9 -1, support and working platform - 9 -2, steel bar binding - 9 -3, Formwork construction - 10 -4, concrete pouring - 12 -5, concrete health - 13 - (2) double thin-walled plate pier construction - 13 -1, formwork construction - 13 - 2, concrete construction - 15 -3, construction joint treatment - 15 - 5, engineering quality inspection standards - 15 - 6, quality assurance system and quality assurance measures - 16 quality assurance system: - 16 quality management measures - 16 sub-project and sub-project quality assurance measures - 16 concrete pouring quality control measures - 16 Quality control measures for steel processing and installation- 17 Key technical measures to prevent common quality problems- 19 - IX. Safety assurance measures- 20 Safety management system measures: - 20 Safety management organization measures:

21 Safety measures for construction machinery operations:- 21 Safety measures for electrical work:- 21 Safety measures for support construction- 21 Safety measures for aerial work- 22 -10. Main measures for environmental protection- 22 Measures for environmental protection of life:

22 Ecological protection measures:- 23 Soil and water conservation measures- 23 - X.

1. Civilized construction management measures - 23 - 1. Project overview 1. Basis for compilation.

1) Technical specifications for highway bridge and culvert construction JTJ041-2000 (2) Highway engineering quality inspection and evaluation standards 2 according to the different forms of pier stud BCoordination between the plant and the site should be strengthened to ensure that the concrete arrives at the work.

1. Before construction, the top surface of the foundation should be washed clean, the concrete foundation should be chiseled off the surface slurry, and the connecting steel bars should be repaired, and the 2 pier formwork and support should meet the requirements of strength, stiffness, suffocation and stability. The joints of the formwork should be tight and should not leak slurry.

3. When the formwork is hoisted as a whole, it should be firmly connected to ensure its integrity, and the height of the section can be determined according to the hoisting capacity.

4. When pouring pier abutment concrete, scaffolding, working platform, etc. shall not be connected with the formwork support. The support should act on a reliable foundation,5 and when pouring concrete, the formwork, reinforcement and embedded parts, the position of the reserved hole and the thickness of the protective layer should be checked frequently.

6. Inspection content of pier formwork installation: pier formwork installation generally needs to check the size of the centerline before and after the left and right, the surface of the flat bridge, the height difference of the adjacent two plate surfaces, the height difference between the two pads of the same pier platform, the embedded parts and the position of the reserved hole.

7. The concrete of the pier should be poured continuously at one time. When pouring intermittently, the construction joints should comply with the provisions of the code.

Matters that should be paid attention to in the construction of bridge piers:

1) The formwork should be made of shaped steel formwork, the surface should be flat and smooth, the joints of the formwork should be tight, and there should be no slurry leakage; The bracket can be made of steel pipe bracket.

2) The formwork should have the necessary strength, stiffness and stability, and can reliably bear the various loads that may be generated in the construction process.

3) The template should be easy to disassemble and assemble to ensure that the shape and size of the structure are accurate.

4) Concrete vibrating must vibrate until it is compact. The sign is that the concrete has stopped sinking, no longer bubbles, and the surface is flat and slurry. When vibrating, avoid the vibrating rod touching the template, steel bar and other embedded parts.

5) In the process of concrete pouring, the construction should be carried out in strict accordance with the construction mix ratio to prevent the water-cement ratio from being too large and the slump from being too large, which will affect the appearance quality of the column and the strength of the concrete.

6) After the concrete is mixed, the slump test should be done at the pouring site and the mixing station respectively to ensure that the water consumption not only meets the requirements of the mix ratio, but also ensures the smooth discharge of the concrete tanker. At the same time, the concrete test block is made according to the regulations.

Before the start of construction, a special construction plan and formwork support structure verification book should be formulated and submitted to the supervision for approval.

Strengthen the alignment control of the pier body. After the installation of each section of the formwork, the elevation, center and plane size of the top surface of the formwork should be detected.

Concrete pouring should be carried out displacement observation, make a good observation record, should strictly control the verticality or slope of the pier body, found that the deviation is corrected immediately.

Safety precautions to be paid attention to in the reinforcement of bridge piers:

Formulate construction plans, safety operation procedures, and safety training.

Lifting injuries are used to overweight equipment (special equipment inspection reliability, operator qualifications: certified to work.

Electric shock to the use of electricity (temporary electricity approval, safety and reliability of electrical line erection, operator qualifications: certificate to work);

Mechanical Injuries Use of other machinery (mechanical equipment inspection, safety and reliability, operating procedures);

Falling from height: There is work at height (special operation personnel qualification, certified to work; scaffolding stability; safety helmets, safety ropes);

Hot work, electric welding, gas welding (hot work approval, special operation personnel qualification, certificate to work) object strike, use of tools and equipment;

Other injuries such as bruises, abrasions.