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Slow-setting prestressed cast-in-situ pile and method for pulling out

A cast-in-situ pile and prestressing technology, which is applied in excavation, sheet pile walls, foundation structure engineering, etc., can solve the problem that the underground engineering rigging cannot be replaced, the prestressed first damage and failure probability are high, and the excavation time of the foundation pit cannot be met. and other problems, to achieve the effect of strong pull-out and buoyancy resistance, easy construction and low cost

Active Publication Date: 2020-09-01
ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The working environment of cast-in-situ piles is rich in water, and the water and soil often contain corrosive trace elements. Under the action of water buoyancy, the concrete works with cracks, and the underground engineering rigging cannot be replaced. If the unbonded prestressing technology is used, the first prestressing damage and The probability of failure is high, and there is a great risk in the project; while the ordinary prestressing technology cannot meet the time requirements for foundation pit excavation

Method used

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  • Slow-setting prestressed cast-in-situ pile and method for pulling out
  • Slow-setting prestressed cast-in-situ pile and method for pulling out
  • Slow-setting prestressed cast-in-situ pile and method for pulling out

Examples

Experimental program
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Embodiment 1

[0034] Such as figure 1 , figure 2 , image 3 , Figure 4 The shown embodiment is a slow-setting prestressed cast-in-place pile for pulling out, including a reinforcement cage 1, a plurality of reinforcement bars 2 and several slow-setting prestressed tendons 3 arranged on the reinforcement cage; each reinforcement and each The slow-setting prestressed tendons all extend along the axial direction of the reinforcement cage, and the slow-setting prestressed tendons include a casing 31 and several prestressed steel strands 32 arranged in the casing, and the casing and each prestressed steel The skeins are filled with slow-bonding prestressing adhesive, and the lower end of each slow-setting prestressed tendon is provided with a prestressed anchor 33;

[0035] The platform includes an enclosed steel frame 41 and poured concrete cast on the enclosed steel frame; the top view of the platform is rectangular or triangular.

[0036] Such as image 3 As shown, the upper ends of th...

Embodiment 2

[0046] Embodiment 2 includes all structure and method parts of embodiment 1, such as Figure 6As shown, embodiment 2 also includes a support base 9, the support base includes a triangular pyramid-shaped spacer 91 and 3 triangular plates 92 arranged on the spacer, the upper ends of the 3 triangular plates are rotatably connected, and the upper ends of the 3 triangular plates are connected to the pads. The upper ends of the blocks are connected by ropes, and the lower ends of the three triangular plates are in contact with the lower edges of the pads.

[0047] Such as Figure 5 Shown, also comprise reamer 12, reamer comprises disc 10 and vertical rod 101, and the upper end of vertical rod protrudes outside the upper surface of disc, and the lower part of vertical rod is provided with arc scraper 102, and arc scraper and vertical rod Rotationally connected, the disc is provided with a first motor 103, the upper end of the vertical rod is provided with a gear ring 104, the gear 1...

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Abstract

The invention discloses a slow-condensation prestressed cast-in-place pile for anti-pulling and a method. The slow-condensation prestressed cast-in-place pile comprise a steel bar cage, a plurality ofsteel bars and a plurality of slow-condensation prestressed bars, wherein the steel bars and the slow-condensation prestressed bars are arranged on the steel bar cage; all the steel bars and all theslow-condensation prestressed bars extend in the axis direction of the steel bar cage, the slow-condensation prestressed bars comprise casing pipes and a plurality of prestressed steel strands arranged in the casing pipes, the spaces between the casing pipes and all the prestressed steel strands are filled with retard-bonded prestressed bonding agents, and a prestressed anchoring body is arrangedat the lower end of each slow-condensation prestressed bar; and all the steel bars and all the slow-condensation prestressed bars are connected with a bearing table. The slow-condensation prestressedcast-in-place pile has the characteristics of low construction cost, easy construction, and high anti-pulling and anti-floating ability.

Description

technical field [0001] The invention relates to the field of basement anti-floating technology, in particular to a slow-setting prestressed cast-in-situ pile and a method for anti-lifting. Background technique [0002] With the continuous development of urban construction, the utilization of underground space continues to advance. There are more and more multi-storey basements, and the foundations are buried deeper and deeper. It is not uncommon for residential projects to use two-story basements, and commercial projects to use three-story and above basements. In the eastern coastal areas, the groundwater is abundant, and the water level is often located on the outdoor floor during the flood season, so the anti-floating problem of the basement is serious. The basement in the above-mentioned areas needs to be equipped with uplift piles. Due to the need for durability, the uplift pile must be checked for cracks under the action of water buoyancy. At present, the amount of st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/58E02D5/34E02D17/02
CPCE02D5/34E02D5/58E02D17/02
Inventor 杨学林祝文畏
Owner ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES