Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A double-layer casing device and construction method for restricting the expansion of the head of cast-in-place pile

A technology for cast-in-place piles and protection devices, which is applied to sheet pile walls, infrastructure engineering, construction, etc., can solve the problems of inability to perform, crack control and crack prevention, and cannot be well adapted to special terrain, so as to save costs and ensure bearing capacity. force effect

Active Publication Date: 2021-07-13
CHINA THREE GORGES UNIV
View PDF0 Cites 0 Cited by
  • 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 cannot well limit the continuous expansion of the pile head of the cast-in-situ pile and cannot be well adapted to special terrains. Defects, so it can not play a good role in crack limit and crack prevention

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A double-layer casing device and construction method for restricting the expansion of the head of cast-in-place pile
  • A double-layer casing device and construction method for restricting the expansion of the head of cast-in-place pile
  • A double-layer casing device and construction method for restricting the expansion of the head of cast-in-place pile

Examples

Experimental program
Comparison scheme
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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a double-layer casing device for limiting the expansion of the head of a cast-in-situ pile and a construction method for the pile. The device uses a double-layer casing as the main structure. The casing is composed of four curved steel plates of equal size, adjacent The arc-shaped steel plates are connected by springs, and a space layer is formed between the two casings. Different materials are filled in according to the actual project. The pouring of the cast-in-place piles is divided into two circles, the inner and outer circles, and the high-pressure grouting and secondary grouting processes are coordinated. Use, so as to limit the continuous expansion of the cast-in-situ pile head, prevent itself from cracking due to continuous expansion, and ensure the bearing capacity of the pile head. The invention is simple to install, has obvious restrictive effects, and high bearing capacity. Corresponding improvement measures can be added according to different foundation conditions It is used, and the present invention not only limits the expansion of the pile head, but can be arranged at any position below the surface of the cast-in-situ pile, and can be widely used in 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com