Active pile foundation underpinning structure and constructing method thereof

A technology of active piles and foundations, which is applied in foundation structure engineering, foundation structure repair, construction, etc., can solve problems such as unclear allocation, small force, and uncontrollable deformation of buildings in advance

Inactive Publication Date: 2007-11-07
铁道第二勘察设计院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The force distribution between the new structure and the column, pile or foundation that needs to be underpinned is not clear;
[0004] 2. The deformation of the building that needs to be underpinned cannot be controlled in advance;
[0005] 3. The deformation of the building that needs to be underpinned after underpinning cannot be readjusted;
[0006] 4. It is only suitable for the underpinning of columns, piles or foundations with little stress

Method used

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  • Active pile foundation underpinning structure and constructing method thereof
  • Active pile foundation underpinning structure and constructing method thereof
  • Active pile foundation underpinning structure and constructing method thereof

Examples

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Embodiment Construction

[0041] Referring to Fig. 1~Fig. 9, underpinning new pile 2, underpinning beam slab 3 are arranged among the present invention. Underpinning the new pile 2 can be based on the construction operation space, using manual hole-digging piles or mechanical hole-forming piles; the columns and piles that need to be underpinned correspond to the shear joints 4 at the underpinning beams (slabs) 3. It is realized by arranging shear tooth slots 8, planting shear keys (reinforcing bars, steel members) 9 on the surface of replaced columns and piles, and applying longitudinal prestress 10 and transverse prestress 11 to the joint;

[0042] Referring to Fig. 10 and Fig. 11, a jacking jack 5 and an adjustable safety self-locking device 12 are placed on the above-mentioned underpinning new top pile cap 6, and the new underpinning pile cap underpinning beam (plate), Embedded with steel plate spacers 13a, 13b, 13c, 13d. In the adjustable safety self-locking device 12, there are steel nuts 12a, st...

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Abstract

The present invention provides one kind of active pile foundation underpin structure, which includes a new underpin pile with pile cap and an underpin beam slab, and has a lifting jack on the pile cap for pre-lifting and unloading the underpin beam slab so as to transfer the load from the pile to be underpinned to the newly constructed underpin structure and realize force conversion. The present invention also provides the construction process of the active pile foundation underpin structure. The present invention makes it possible to control actively the deformation of the upper building to be underpinned, and is suitable for pile foundation underpin with great axial force.

Description

Technical field: [0001] The invention relates to an active pile foundation underpinning structure and a construction method thereof, belonging to the fields of foundation reinforcement and pile foundation underpinning. Background technique: [0002] When constructing underground projects such as subways under existing buildings, it is often necessary to deal with the existing pile foundations and implement pile foundation underpinnings, that is, to support columns, piles or foundations that need to be underpinned by building new underpinning structures. , and transfer the load it bears to the newly constructed underpinning structure. In the past, pile foundation underpinning projects generally used to expand the load-bearing range of pile foundations (such as tree root piles, rafts, etc.), or to build structural slabs (beams) connected to columns, piles, and foundations that need to be underpinned at one time. The new structure formed by piles can reduce the force of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D37/00
Inventor 罗世培刘建国周运斌潘明亮王浩许志艳涂强朱祖华张海波周勇牟锐扈森方昌福喻波刘启峰李德才郭俊李隆平杜兴平
Owner 铁道第二勘察设计院
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