Double-layer pile casing device for limiting expansion of head of cast-in-place pile and construction method

A technology of cast-in-situ piles and protection devices, which is applied in sheet pile walls, foundation structure engineering, buildings, etc., can solve problems such as inability to achieve cracks, limit cracks and prevent cracks, and special terrain cannot be well adapted, so as to save costs and ensure bearing capacity force effect

Active Publication Date: 2020-04-21
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, methods to limit the continuous expansion of the pile tip include wrapping the head with carbon fiber cloth and adding expansive concrete to the steel pipe pile. However, these methods ca

Method used

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  • Double-layer pile casing device for limiting expansion of head of cast-in-place pile and construction method
  • Double-layer pile casing device for limiting expansion of head of cast-in-place pile and construction method
  • Double-layer pile casing device for limiting expansion of head of cast-in-place pile and construction method

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Experimental program
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Effect test

Embodiment 1

[0050] see Figure 1-9 , a double-layer casing device that limits the expansion of the head of the cast-in-situ pile, it includes an outer casing 1 and an inner casing 2, the outer casing 1 is made of a plurality of outer arc-shaped steel plates, and the adjacent outer arc-shaped The steel plates are connected by a stretching device 21, and are integrally connected to form a ring structure; the outer casing 1 and the inner casing 2 are connected by a telescopic device 31, and the inner casing 2 is located in the middle of the outer casing 1 ; An air-space layer 3 is formed between the outer casing 1 and the inner casing 2 . The device can be placed at any position of the pile body, and the device can be installed at any position of the pile body to limit its expansion, so the position of the device is more flexible.

[0051] Further, the inner casing 2 is made of a plurality of inner arc-shaped steel plates, and adjacent inner arc-shaped steel plates are connected by a stretc...

Embodiment 2

[0058] The construction method of the double-layer casing device for limiting the expansion of the head of the cast-in-situ pile includes the following steps:

[0059] S1: Fix the position of the inner casing 2 through the telescopic device 31, and then add ceramsite to the space layer 3; then lay a piece of carbon fiber cloth along the inner casing 2, and the total length of the carbon fiber cloth is higher than the top edge of the device , the carbon fiber cloth is provided with a circle of uniform folds around the bottom of the inner casing 2;

[0060] S2: Drilling, drilling to the design depth, raising the drilling, extending into the conduit, and spraying grout around the pile hole;

[0061] S3: Place the double-layer casing device at the bottom of the pile hole, lower the reinforcement cage, and lower the sleeve between the reinforcement cages;

[0062] S4: Concrete pouring at the pile end, which is divided into two circles, the inner and outer circles. The outer circle...

Embodiment 3

[0065] Such as Figure 4 As shown, for different foundations and different substances added in the space layer, high-strength ceramsite is added to the space layer, which is suitable for places where large deformation of the soil is not allowed; low-strength ceramsite is added to the space layer, which is suitable It is suitable for places where large deformation of the soil is allowed; coral sand is added to the space layer, which is suitable for coral sand foundations.

[0066] A construction method of a double-layer casing device for limiting the expansion of the head of a cast-in-place pile is characterized by comprising the following steps:

[0067] S1: Fix the position of the inner casing 2 through the telescopic device 31, and then add ceramsite to the space layer 3 according to the allowable deformation of the soil; then lay a piece of carbon fiber cloth along the inner casing 2, and the carbon fiber cloth The length is higher than the top edge of the device, and the ...

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Abstract

The invention discloses a double-layer pile casing device for limiting expansion of a head of a cast-in-place pile and a cast-in-place pile construction method. According to the device, double-layer pile casings are used as a main body structure, wherein each pile casing is composed of four arc-shaped steel plates with the same size; every two adjacent arc-shaped steel plates are connected througha spring; a spacing layer is formed between every two adjacent pile casings; different substances are selected to be filled according to actual engineering; the pile end of the cast-in-place pile ispoured in an inner circle and an outer circle; and the high-pressure grouting process and the secondary grouting process are used in cooperation, so that continuous expansion of the head of the cast-in-place pile is limited, the head is prevented from cracking due to continuous expansion, and the bearing capacity of the pile head is guaranteed. The double-layer pile casing device is easy to place,obvious in limiting effect and high in bearing capacity, and corresponding improvement measures can be added according to different foundation conditions for use; and the double-layer pile casing device not only limits expansion of the pile head, but also can be arranged at any position below the ground surface of the cast-in-place pile, and can be widely applied to coral sand foundations or foundations with particle crushing properties.

Description

technical field [0001] The invention relates to the fields of architecture and civil engineering construction, in particular to a double-layer casing device and a construction method for limiting the expansion of the head of a cast-in-place pile. Background technique [0002] Coral sand is coral or shell fragments, with the characteristic of continuous release of calcium carbonate, with different particle sizes and various specifications. The biggest feature of coral sand is that it is rich in micropores, low in strength, easy to break, and difficult to recover after structural damage. When piles are formed in calcareous sand foundation, since the calcareous sand particles will be broken under very small stress, no matter whether it is driven pile or cast-in-place pile, due to the disturbance of calcareous sand foundation soil, the calcareous sand around the pile will be broken. After being squeezed, the particles are broken, resulting in a large gap. After the pile is form...

Claims

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Application Information

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IPC IPC(8): E02D5/66E02D5/38E02D27/12E02D27/32
CPCE02D5/38E02D5/665E02D27/12E02D27/32E02D2200/1621E02D2250/003E02D2300/0029E02D2600/20
Inventor 刘杰陶鑫波王芳张瀚
Owner CHINA THREE GORGES UNIV
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