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Pile sinking method for U-shaped pre-tensioning prestressed concrete slab

A concrete slab, prestressed technology, applied in sheet pile wall, construction, infrastructure engineering and other directions, can solve the problems of small contact surface of the connecting part, affecting the water-stop performance, and difficult alignment of the datum plane, so as to achieve easy construction, Guarantee construction quality and ensure the effect of water-stop performance

Active Publication Date: 2014-06-11
ZHONGYIFENG CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its U-shaped cross-section, compared with sheet piles with rectangular and I-shaped cross-sections, the contact surface of the connecting part is smaller, the reference plane is not easy to align and level, and it is difficult to combine the first connecting part and the second connecting part. Water-stop performance, resulting in difficulties in pile sinking construction

Method used

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  • Pile sinking method for U-shaped pre-tensioning prestressed concrete slab
  • Pile sinking method for U-shaped pre-tensioning prestressed concrete slab
  • Pile sinking method for U-shaped pre-tensioning prestressed concrete slab

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment one: see figure 1 Shown, a kind of pretensioning method U-shaped prestressed concrete sheet pile sinking method comprises the following steps:

[0035] 1. Positioning and setting out

[0036] According to the measurement control points and design drawings provided by the construction unit, the position of the center line of the pile row is initially determined. After the trench is excavated, the center line of the pile row is accurately measured and calibrated, the steel purlin is erected, and each pile is determined according to the size of the sheet pile. At the central point, the construction can start after the construction unit and other relevant unit personnel review and inspect the line. Surveyors are required to record the center point and horizontal elevation of each pile position with a high degree of responsibility to ensure that the pile location is accurate and the pile top elevation basically meets the requirements. During the construction pro...

Embodiment 2

[0066] Embodiment 2: A road box culvert project with a total length of about 340.0m and a width of 6.0m. The soil layer distributed on the surface of the site is miscellaneous fill and silt in order, with a thickness of 0.7-1.3m; silty clay 1.0-2.3m; silty silty clay 2.1-5.3m; silty clay 3.3-3.7m; ~4.6m. The box culvert slope enclosure adopts pretensioned U-shaped prestressed concrete sheet piles.

[0067] The pretensioned U-shaped prestressed concrete sheet piles are constructed using the vibration method. The longest pile length is L=10m, passing through 3 layers of silty clay, and the piles are assisted by spiral soil extraction holes, which saves the construction period.

Embodiment 3

[0068] Embodiment 3: A retaining wall enclosure project, the soil layer distributed on the surface of the site is miscellaneous fill soil in sequence, with a thickness of 0.8-1.2m; clay 0.5-1.0m; silty clay 1.5-1.9m; ​​silt 10.0-11.1m; Quality clay 1.7 ~ 4.6m. The length of the retaining wall enclosure is 770m. In the case of using the traditional support form, the enclosure body is a temporary structure, which will be discarded after the construction of the retaining wall. The current enclosure structure adopts pre-tensioned U-shaped prestressed concrete sheet piles. The "two walls in one" of the wall and the enclosure sheet pile shortens the construction period while saving the project cost.

[0069] The pretensioned U-shaped prestressed concrete sheet piles are constructed using the vibration method, the pile length L=11.3m, the pile ends are located in the silt soil layer, and the piles are sunk directly without auxiliary measures.

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Abstract

The invention discloses a pile sinking method for a U-shaped pre-tensioning prestressed concrete slab, which comprises the following steps: determining the centre lines of rows of piles, and marking the positions of the central point of each slab pile; arranging a profile steel guide frame; arranging a pair of temporary support steel piles; causing the upper surface of a guide beam of the profile steel guide frame to be lower than the standard height of the top of the pile, and causing the lower surface of a connecting piece to be higher than the height of the top of the pile; sinking a first slab pile; inserting the next slab pile to the corresponding position in the profile steel guide frame; arranging a roller device perpendicular to the guide beam on the outer side of the slab pile; withdrawing a positioning rig; clamping the slab pile to be sunk with the roller device to be sunk; loosening the second temporary steel support pile when the profile steel guide frame can not accommodate the next slab pile; moving the profile steel guide frame and the first steel temporary support pile; causing the other end of the profile steel guide frame to clamp the sunk slab pile by the steel guide frame; and repeating the above steps until the pile sinking operation is accomplished. With the pile sinking method, the problem that the U-shaped slab pile is hard to align during sinking pile is solved, the pile sinking method is suitable for construction, and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to the manufacture of enclosure structures in the construction field, in particular to a method for carrying out pile sinking operations on U-shaped concrete sheet piles. Background technique [0002] The foundation pit enclosure structure mainly bears the water pressure and earth pressure generated by the excavation and unloading of the foundation pit, and transmits this pressure to the support. It is a construction temporary retaining wall structure for stabilizing the foundation pit. At present, the methods for foundation pit support mainly include bored piles, underground diaphragm walls, and steel sheet piles. Chinese invention patent application CN101812840A discloses a U-shaped concrete sheet pile, which is made of concrete and has a generally U-shaped cross-section, wherein the U-shaped cross-section has a bent section at the bottom of the U-shaped, As well as the first connecting section and the second connecting section...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D7/18E02D13/04
Inventor 程月红
Owner ZHONGYIFENG CONSTR GRP