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Shielding shaft vertical jacking mold testing device and method

A model test device and jacking technology, applied in teaching models, educational tools, instruments, etc., can solve problems affecting the safety and durability of tunnel structures, complex engineering conditions, and low numerical accuracy, and achieve simple structure and low cost. Inexpensive, easy-to-make effects

Pending Publication Date: 2019-06-28
GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the vertical jacking construction process of the shaft, the disturbance characteristics of the overlying and underlying soil layers of the shield tunnel determine the magnitude of the jacking force and the processing range of the soil layer during vertical jacking, and the deformation characteristics of the shield segments affect the safety of the tunnel structure and durability; the current soil disturbance characteristics and reinforcement range mainly rely on empirical judgment, segment deformation can be estimated by simplified theory, but the actual engineering conditions are extremely complex, and the numerical values ​​calculated by experience and simplified theory have low accuracy and large dispersion. Therefore exercise test simulation is crucial

Method used

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  • Shielding shaft vertical jacking mold testing device and method
  • Shielding shaft vertical jacking mold testing device and method
  • Shielding shaft vertical jacking mold testing device and method

Examples

Experimental program
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Embodiment 1

[0055] Embodiment 1, using a PE pipe with a diameter of 600mm, a thickness of 30mm, and a ring width of 150mm to simulate a shield tunnel 3, including a 20° capping block, two 62° adjacent blocks and three 72° standard blocks , to meet the similarity ratio of 1:10. The shield tunnel 3 includes four pipe rings with a total length of 600 mm. There are 12 and 11 longitudinal ring joints 6 of the shield tunnel 3 respectively. According to the similarity theory and the principle of equivalent stiffness, a 10 mm wide plastic sheet and bolts 5 constitutes the longitudinal circular seam joint 6. The pipe jacking tunnel 4 is simulated with a PE pipe with a diameter of 180 mm, a thickness of 20 mm, and a ring width of 200 mm. The opening of the shield tunnel 3 with the pipe jacking is a semicircular ring with a diameter of 95 mm. The counter force diffusion block 9 has a width of 200mm, the bottom is attached to the shield tunnel 3, and the height of the midpoint is 30mm.

[0056] The...

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Abstract

The invention discloses a shielding shaft vertical jacking mold testing device and method. The testing device comprises a tank body, a shielding tunnel, a top tube tunnel, a soil body and a monitoringsystem. The testing device is established according to similarity theories, rigidity equivalent effect theories and symmetry, and in addition is simple in structure, and components can be replaced according to actual situations. By adopting the testing method, the actual vertical jacking process of a shielding shaft can be simulated, by adopting the monitoring system, structure change of the shielding tunnel and the soil body can be finely fed back, a tester can visibly experience the structure change of the soil body, and an effective instruction function can be achieved. The device is applied to the field of underground building construction.

Description

technical field [0001] The invention relates to the field of underground construction engineering, in particular to a vertical jacking model test device and method for a shield shaft. Background technique [0002] During the construction of shield tunnels, it is common for shield machines to pass through shafts, especially in the shield construction of municipal pipelines such as electric power and water transportation. The above phenomenon is more prominent because the distance between the wells is relatively small. Every time the shield machine passes through a shaft, the When it comes to shield tunnel entry and exit issues, if the conventional scheme of excavating shafts first and then tunnel construction is adopted, a large number of auxiliary measures for entry and exit holes are required, which is risky and takes a long time. In contrast, the tunnel-first-the-well construction method of excavating the shaft after the tunnel construction has made up for the shortcomings...

Claims

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Application Information

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IPC IPC(8): G09B25/04
Inventor 魏立新杨春山刘力英汪传智叶婷婷
Owner GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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