Large-size rectangular jacking pipe jacking force estimation method based on displacement control

A rectangular pipe jacking and displacement control technology, applied in calculation, computer-aided design, special data processing applications, etc., can solve the problems of pipe structural damage, uncertainty, jacking failure, etc., and achieve the effect of high estimation accuracy

Active Publication Date: 2019-09-03
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

In the numerical simulation of engineering mechanical behavior, the stress control method is usually used. Due to the uncertainty of the empirical calculation formula and the theoretical calculation formula, the estimation result of the jacking force is uncertain. If the jacking force is too large, the structure of the pipe section will be damaged, and if the jacking force is too small will lead to jacking failure

Method used

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  • Large-size rectangular jacking pipe jacking force estimation method based on displacement control
  • Large-size rectangular jacking pipe jacking force estimation method based on displacement control
  • Large-size rectangular jacking pipe jacking force estimation method based on displacement control

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Effect test

Embodiment example A2

[0058] Pipe jacking implementation case A 2 (design parameters, construction conditions and A 1 Consistent): actual measurement, empirical formula, pipe jacking implementation case A 1 The comparison of the fitting relationship between the jacking force and the jacking distance obtained by the displacement control finite element method under the optimal grouting pressure scheme (grouting pressure scheme 4), this figure can be used as an indication of whether the displacement control finite element method is universal a verification.

[0059] Table 5. B under different grouting pressure schemes 1 Comparison of Projected Push Force Estimation Deviations

[0060]

[0061] Pipe jacking implementation case B 1 : Comparison of the fitting relationship between jacking force and jacking distance obtained from actual measurement, empirical formula, and displacement control finite element model under different grouting pressure schemes.

[0062] Table 6. Case B 2 Bias in jack-t...

Embodiment example B2

[0065] Pipe jacking implementation case B 2 (design parameters, construction conditions and B 1 Consistent): actual measurement, empirical formula, and pipe jacking implementation case B1 under the optimal grouting pressure scheme (grouting pressure scheme 1) The comparison of the fitting relationship between the jacking force and the jacking distance obtained by the displacement control unit method, the figure It can be used as a verification of whether the displacement control finite element method is universal.

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Abstract

The invention relates to a large-size rectangular jacking pipe jacking force estimation method based on displacement control. The method comprises the following steps of 1, establishing a soil layer-rectangular jacking pipe numerical analysis model by using the numerical analysis software Abaqus; 2, applying a given jacking distance and grouting pressure scheme to the rectangular jacking pipe according to the established numerical analysis model; 3, obtaining different jacking forces according to different jacking distances and grouting pressure schemes, and drawing a fitting curve of the jacking forces along with the change of the jacking distances under different grouting pressure schemes; and 4, repeating the step 2 and the step 3 to obtain different fitting curves, comparing the fitting curves with an empirical formula and measured data to obtain an optimal fitting curve and a jacking force fitting function, and estimating the jacking force, wherein the fitting function can serve as a jacking pipe jacking force calculation general formula with the same design parameters and construction conditions. According to the method, the jacking force can be estimated easily instead of atime-consuming trial-and-error method, and the jacking force estimation method can better adapt to various pipeline and soil body contact conditions.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for estimating the jacking force of a large-size rectangular pipe jacking based on displacement control. Background technique [0002] Pipe jacking construction is to use the jacking force generated by the jacking equipment to overcome the friction between the pipeline and the surrounding soil in the working pit, and push the pipeline into the soil according to the designed slope. After one section of pipe has been jacked into the soil layer, the second section of pipe section continues to be jacked, and so on, and the pipe is buried between the two pits. During the pipe jacking construction process, the jacking force is the most critical parameter in the entire pipe jacking project. With the continuous excavation of the pipe jacking machine, all the pipes need to rely on the jacking force to be pushed into the soil, and the jacking force is transmitted betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06Y02E10/20
Inventor 肖尊群董琼英汤东桑王鑫杨凯曹童童姜亦男
Owner WUHAN INSTITUTE OF TECHNOLOGY
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