Oblique launching method for large-section rectangular jacking pipe

A technology of rectangular pipe jacking and large cross-section, which is applied in the direction of earthwork drilling, mining equipment, tunnels, etc. It can solve the problems of unresolved vertical inclination and pipe joint backfilling, etc., so as to avoid uneven force and prevent deviation from exceeding The effect of limiting and saving construction costs

Pending Publication Date: 2021-08-24
BCEG CIVIL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this construction method, the concrete of the portal is removed and the yellow sand is backfilled, and the pipe jacking machine is excavated into the receiving shaft. section backfill problem

Method used

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  • Oblique launching method for large-section rectangular jacking pipe
  • Oblique launching method for large-section rectangular jacking pipe
  • Oblique launching method for large-section rectangular jacking pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like Figure 1-11 As shown, a preferred embodiment of the present invention provides a method for oblique initiation of large-section rectangular pipe jacking, including the following steps:

[0041]Step S1. Construct the enclosure structure 1 around the pipe jacking well. Specifically, glass fiber reinforcement is used for the reinforcement of the enclosure structure 1 facing the soil within the scope of the pipe jacking well opening, and the cutter head of the pipe jacking machine can be directly cut. The back soil surface of enclosure structure 1 (pipe jacking well side) adopts steel bars.

[0042] Step S2. Excavating the pipe jacking well, and pre-burying the oblique steel ring 2 at the portal in the jacking direction.

[0043] Step S3. Cut away the enclosure structure 1 at the opening where the pipe jacking starts, remove the reinforced concrete on the back soil surface, and keep the glass fiber reinforced concrete on the soil facing surface (thickness is about o...

Embodiment 2

[0057] In another preferred embodiment, the present invention provides a rectangular starting extension structure for pipe jacking, including an enclosure structure 1, an oblique steel ring 2, a guide rail 4, a wedge-shaped extending steel ring 5, and a low-strength machinable filling Material 7, wedge-shaped backrest 8, backstop device 12 and linkage top iron.

[0058] Concretely, the enclosure structure 1 is set outside the side wall 21 of the pipe jacking work well, and the reinforcement on the soil-facing surface of the enclosure structure within the scope of the opening of the work well is made of glass fiber reinforcement, and the cutter head of the pipe jacking machine can be directly cut.

[0059] Specifically, the cross-section of the oblique steel ring is L-shaped, and the overall shape is obliquely rectangular. The oblique direction is the same as the axial direction of the pipe jacking machine. The diameter ratio of the inner ring is greater than the diameter of the...

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PUM

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Abstract

The invention discloses an oblique launching method for a large-section rectangular jacking pipe. The oblique launching method includes the steps that S1, an enclosure structure is constructed on the periphery of a jacking pipe working well; S2, the pipe jacking working well is excavated, and an inclined steel ring is pre-buried at the position of a tunnel portal in the jacking direction; S3, the enclosure structure at the position of a jacking pipe starting portal is chiseled off; S4, according to the jacking direction, guide rail base concrete is constructed in the pipe jacking working well, and a guide rail is installed on the guide rail base concrete; S5, a wedge-shaped extension steel ring is installed, a rib plate is installed at the exposed end of the wedge-shaped extension steel ring, and a cavity formed by the enclosure structure, the inclined steel ring, the wedge-shaped extension steel ring and the rib plate is filled a low-strength machinable filler; S6, a wedge-shaped rear backrest, a jack support, a propelling jack and a rectangular pipe jacking machine are hoisted; S7, linkage jacking iron is placed in the pipe jacking working well and connected with the propelling jack, and retaining devices are installed on the two sides of the jack support on the inclined face side of the wedge-shaped rear backrest; and S8, the rectangular pipe jacking machine is pushed to move forwards for construction through the propelling jack, and the oblique launching of the rectangular jacking pipe is completed.

Description

technical field [0001] The invention relates to the technical field of pipe jacking construction, in particular to an oblique starting method for large-section rectangular pipe jacking. Background technique [0002] With the acceleration of urbanization, rail transit has become one of the important means to solve urban traffic congestion. Major cities are continuing to promote subway construction, and mechanized construction has gradually become the mainstream of subway construction methods, especially in recent years. Pipeline construction has become a new hot spot. However, subways are often built in the bustling areas of cities. Due to the tight urban land use and the complex layout of underground pipelines, the pipe jacking work well must be adjusted according to the actual situation. Between 0° and 90°, the cutter head of the pipe jacking machine cannot cut the soil in front, and the force is uneven, which may easily cause axis deviation and eccentric wear of the cutte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/10
CPCE21D9/10E21D9/1093
Inventor 赵洪岩李生光王锡军马云新武佑衡王根成李森卢会堂阚宝存
Owner BCEG CIVIL ENG
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