Method for processing prestress square pile

A processing method and prestressing technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of time-consuming, labor-intensive, erosion, and durability-affected reinforcement cages, and achieve improved crack resistance and ultimate bending moment, Improve the tensile bearing capacity of the structure and the effect of increasing the vertical bearing capacity

Inactive Publication Date: 2008-11-12
DALIAN GREAT GOLDEN HORSE INFRASTRUCTURE
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AI Technical Summary

Problems solved by technology

[0002] In the design of pile foundation, ordinary reinforced concrete piles cannot bear 4-5N / mm 2 Tensile stress. Under normal conditions, cracks will inevitably appear when the pile is hammered into the soil. For slender piles, cracks will also appear during stacking, transportation, hoisting, and erection. When the pile is underground, the cracks will seep The erosion of harmful substances and harmful substances will inevitably affect its durability. Therefore, in ordinary reinforced concrete piles, although a large number of steel bars are configured, it is still difficult to solve the problem of cracks in the pile body and cannot ensure the service life of the pile.
Prestressed concrete piles can effectively improve the crack resistance of piles. Pre-set steel cages are used, and the steel cages need 50-100 stirrups to tighten the main reinforcement at a certain distance, and then the molds are cast and maintained. The production process of stressed concrete piles is complicated, and the production of steel cages is time-consuming and laborious, which increases the production cost of prestressed concrete piles

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  • Method for processing prestress square pile
  • Method for processing prestress square pile

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Experimental program
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Effect test

Embodiment 1

[0019] Process and produce prestressed concrete solid piles as shown in Figures 1 and 2 as follows:

[0020] The first step of threading the reinforcement: first place the square and octagonal spiral stirrups and prefabricated pile tips on the prestressed tensioning platform, and then thread the octagonal main reinforcement inside the inner octagonal spiral stirrup according to the hole position of the end formwork, that is, 2, 4 , No. 15, 13, 7, 11, 10, and No. 6 holes wear the main rib to form the inner octagonal main rib, and then wear the four-corner main rib at the four corners of the four-corner stirrup, that is, the No. 1, 5, 16, and No. 12 holes wear the main rib to form an outer The quadrilateral main rib is locked with a tracing tool at both ends;

[0021] The second step of tensioning: the tensioning control stress is 70% of the standard strength of the steel bar. Firstly stretch the inner octagonal main reinforcement on the opposite side of the main reinforcement ...

Embodiment 2

[0025] Process and produce prestressed concrete hollow piles as shown in Figures 1 and 3 as follows:

[0026] The first step is to thread the reinforcement: first place the square spiral stirrup 17, the octagonal spiral stirrup 18 and the prefabricated pile tip 19 on the prestressed tensioning table, and then thread the octagonal spiral stirrup in the inner octagonal spiral stirrup according to the hole position of the end template. The main reinforcement of the spiral rib steel bar, that is, No. 2, 3, 4, 15, 14, 13, 7, 11, 10, and No. 6 holes wear the main reinforcement to form an inner octagonal main reinforcement, and then wear the four-corner main reinforcement at the four corners of the four-corner stirrup, that is, 1 , No. 5, 16, and 12 holes pass through the main rib to form an outer quadrilateral main rib, and lock both ends with a tracing tool;

[0027] The second step of tensioning: the tensioning control stress is 70% of the standard strength. Firstly stretch the i...

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Abstract

The invention relates to the construction field. The processing method of a pre-stress square pile includes the steps that: firstly, bar sheathing, wherein, a main octagonal reinforced bar is sheathed in an inner octagonal spiral hoop bar according to a hole position and then a main tetragonal reinforced bar is sheathed in a tetragonal position in a tetragonal hoop bar and the two ends are locked tightly by anchorages; secondly, tensioning, wherein, the main reinforced bar is tensioned by sections in a tensioning platform to 105 percent of the tension and then anchoring is carried out; thirdly, casting, wherein, the concrete casting is conducted in compound die after the inspection of tension and when the strength of the concrete meets the requirements, the reinforced bar is released and the unwanted main reinforced bar is cut; fourthly, finishing operation is carried out. Compared with the similar processing method, the method of the invention does not need pre-cast reinforced cage, and the bar sheathing can be directly conducted in the tensioning platform; the hoop bar is a spiral bar, thus having convenient installation but no breaking end, saving time and labor and having no need for wielding. The processing method of the invention can be used for pre-making solid pile or hollow pile in various sizes, thus increasing the anti-cracking strength and the limit bending moment of the pile body and prolonging the service life to 50 to 100 years.

Description

1. Technical field: [0001] The invention relates to the field of building construction, in particular to a square pile production method. 2. Background technology: [0002] In the design of pile foundation, ordinary reinforced concrete piles cannot bear 4-5N / mm 2 Tensile stress. Under normal conditions, cracks will inevitably appear when the pile is hammered into the soil. For slender piles, cracks will also appear during stacking, transportation, hoisting, and erection. When the pile is underground, the cracks will seep The erosion of harmful substances will inevitably affect its durability. Therefore, in ordinary reinforced concrete piles, although a large number of steel bars are configured, it is still difficult to solve the problem of cracks in the pile body, and the service life of the pile cannot be guaranteed. Prestressed concrete piles can effectively improve the crack resistance of piles. Pre-set reinforcement cages are used, and the reinforcement cages require 50...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/30E02D5/72
Inventor 徐世大
Owner DALIAN GREAT GOLDEN HORSE INFRASTRUCTURE
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