Method for arranging jacking pipe of rectangular open caisson

A caisson and pipe jacking technology, applied in pipeline laying and maintenance, mechanical equipment, cable installation, etc.

Active Publication Date: 2012-12-19
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, these documents, based on central jacking, proposed their own calculation methods for the stress state and maximum allowable jacking force of the working well, but they did not analyze the earth pressure distribution and allowable jacking force of the eccentric jacking of the rectangular working well.

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  • Method for arranging jacking pipe of rectangular open caisson
  • Method for arranging jacking pipe of rectangular open caisson
  • Method for arranging jacking pipe of rectangular open caisson

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example

[0070] The test site is a pipe jacking project, the depth of the working well is 18.9m, the width is 18.2m, and the center of the pipe jacking is 12.9m from the surface.

[0071] In order to optimize the calculation of the maximum jacking force, such as figure 1 force mode. The specific method and steps are as follows:

[0072] 1) Measure the average internal friction angle of the excavation through sampling test or in-situ test The average cohesion c=9kPa, the bulk density of soil γ=18kN / m3. According to the construction plan, it is determined that the buried depth from the bottom of the working well to the original ground is Hs=18.9m, the width of the working well is B=18.2, and the length L=11.2m.

[0073] Table 1 Soil layer material parameters

[0074]

[0075] 2) Substituting the soil mass and working well parameters into each earth pressure formula, determining the earth pressure acting on the working well, taking the safety factor of 2.0, and calculating F max ...

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Abstract

The invention provides a method for arranging a jacking pipe of a rectangular open caisson, which comprises the following steps: (a) obtaining soil parameters and open caisson parameters of a region of a working area applying the rectangular open caisson; (b) calculating soil pressure along each direction of the open caisson according to the soil parameters and the open caisson parameters; and (c) calculating an allowed jacking force for eccentrically jacking of the jacking pipe according to a distribution mode of the soil pressure and the soil pressure, and causing a jacking force required by the advancing of the jacking pipe to be less than the allowed jacking force for eccentrically jacking. According to the method provided by the invention, the soil parameters of the working area are confirmed according to the geological data and test data; the soil pressure acted on each direction of a working well is solved by utilizing the jacking force of the pipeline, a soil pressure formula and a given soil pressure distribution shape; the allowed jacking force for eccentrically jacking of the jacking pipe of the working well is finally calculated; and according to the allowed jacking force, the jacking pipe of the rectangular open caisson can be safely arranged.

Description

technical field [0001] The present invention relates to the technical field of construction engineering, in particular to a pipe jacking method for a rectangular caisson. Background technique [0002] As a construction method of underground excavation, pipe jacking construction has many advantages, such as small footprint; underground construction does not affect ground activities; when crossing obstacles such as railways, highways, rivers, and buildings, it can reduce the workload of demolition along the line; During the construction process, the existing pipelines and structures will not be damaged, and the normal use will not be affected; the construction will be noiseless and reduce environmental pollution along the line. Therefore, pipe jacking construction technology has been widely used in recent years. The laying of upper and lower sewers, gas, electric power, communication engineering, liquefied petroleum gas, natural gas pipelines and various communication cables ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/028H02G9/06
Inventor 程仕远雷晗陈锦剑王建华
Owner SHANGHAI JIAO TONG UNIV
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