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Construction method for improving bearing capacity of inclined steel pipe pile

A construction method and technology of steel pipe piles, which are applied in sheet pile walls, foundation structure engineering, construction, etc., can solve problems that easily affect the bearing capacity of pile foundations, and achieve improved sinking construction efficiency, high reliability, and grouting volume Reduced effect

Active Publication Date: 2020-01-24
SHANGHAI CHANGKAI GEOTECHN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain problems in the construction process, which can easily affect the bearing capacity of the pile foundation.

Method used

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  • Construction method for improving bearing capacity of inclined steel pipe pile
  • Construction method for improving bearing capacity of inclined steel pipe pile
  • Construction method for improving bearing capacity of inclined steel pipe pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: as Figure 1-5 As shown, this embodiment specifically relates to a construction method for improving the bearing capacity of inclined steel pipe piles. The construction method mainly includes the following steps:

[0024] (1) Insert the oblique steel pipe pile 1 obliquely into the soil layer to a predetermined depth using the sinking machine, and use the self-stiffness of the oblique steel pipe pile 1 to ensure that the inclination of the pile body meets the design requirements;

[0025] Among them, the main body of the oblique steel pipe pile 1 is the steel pipe pile body 2, and the lower end of the steel pipe pile body 2 is provided with a reducing pipe section 3 and a guide pipe 4 in sequence, the reducing pipe section 3 has a trumpet-shaped opening, and the guide pipe 4 is a cylindrical thin wall with upper and lower openings, the large diameter port of the variable diameter pipe section 3 is connected with the lower port of the steel pipe pile body 2,...

Embodiment 2

[0030] Embodiment 2: as Image 6 As shown, this embodiment specifically relates to the application of the construction method for improving the bearing capacity of inclined steel pipe piles in Embodiment 1 to the foundation pit enclosure engineering, which specifically includes the following steps:

[0031] (1) Use the construction method in Example 1 to construct oblique steel pipe piles 1 in the soil outside the foundation pit and connect them coaxially with the rotary grouting reinforcement section 9 to form an integrated oblique force-bearing body;

[0032] (2) Afterwards, the upper end of the oblique steel pipe pile 1 is connected through the ring beam 11, so that the oblique force-bearing body can be connected with the entire foundation pit enclosure body 10, and the oblique force-receiving body is opposite to the foundation pit enclosure body. 10 plays the role of pulling anchors, preventing the foundation pit enclosure 10 from tilting inward to affect the safety of the...

Embodiment 3

[0033] Embodiment 3: as Figure 7 As shown, this embodiment specifically relates to the application of the construction method for improving the bearing capacity of inclined steel pipe piles in Embodiment 1 to the foundation pit enclosure engineering, which specifically includes the following steps:

[0034] (1) Use the construction method in Example 1 to construct oblique steel pipe piles 1 in the soil in the foundation pit and connect them coaxially with the rotary grouting reinforcement section 9 to form an integrated oblique force-bearing body;

[0035] (2) Afterwards, the upper end of the oblique steel pipe pile 1 is connected through the ring beam 11, so that the oblique force-bearing body can be connected with the entire foundation pit enclosure body 10, and the oblique force-receiving body is opposite to the foundation pit enclosure body. 10 acts as an oblique upward support, preventing the foundation pit enclosure 10 from inwardly tilting and affecting the safety of t...

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Abstract

The invention discloses a construction method for improving bearing capacity of an inclined steel pipe pile. The construction method comprises the following steps that (1) the inclined steel pipe pileis obliquely inserted into a soil layer to a predetermined depth by a sinking machine, the inclined steel pipe pile comprises a steel pipe pile body, and a variable diameter pipe section and a guidepipe are sequentially arranged at the lower end of the steel pipe pile body; (2) a high-pressure rotary jet drill rod on a drilling machine is extended into the steel pipe pile body, and is drilled tothe design top elevation position of a to-be-constructed rotary jet strengthening section in the soil layer under the guidance of the guide pipe; (3) after drilling to the design top elevation position, the high-pressure rotary jet drill rod rotarily jets cement slurry with high pressure while drilling, and a rotary jet strengthening section is formed; and (4) the high-pressure rotary jet drill rod is lifted off the inclined steel pipe pile, then the inclined steel pipe pile is subjected to sinking construction to the depth of the rotary jet strengthening section, and thus the inclined steelpipe pile and the rotary jet strengthening section form a coaxial integrated structure. The construction method has the advantages of simple and fast construction method, high reliability and low project cost.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a construction method for improving the bearing capacity of inclined steel pipe piles. Background technique [0002] The construction method of oblique steel pipe piles is usually to carry out a certain length of high-pressure rotary jet reinforcement in a certain area at the end of the steel pipe pile, and then insert the steel pipe pile into the reinforcement body, and finally ensure that the steel pipe and the pile end reinforcement body are jointly stressed. However, due to the high flexibility of the high-pressure rotary grouting drill pipe, it is difficult to ensure the line shape of the drill pipe during oblique drilling (from oblique line to deflection line), and the reinforcement area is prone to deviation, which leads to the failure of subsequent steel pipe piles. It can be effectively inserted into the high-pressure rotary grouting reinforcement a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/22E02D5/46
CPCE02D5/22E02D5/46
Inventor 顾宏尹骥陈晖毛喜云王克文徐司慧吕强
Owner SHANGHAI CHANGKAI GEOTECHN ENG
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