Shield device for excavation of various sections and construction method
An excavation surface and shield technology, which is applied in the field of shield equipment, can solve the problems of inability to automatically balance the excavation surface, difficulty in maintaining air pressure, and difficulty in continuous excavation, so as to achieve the ease of shield transportation and on-site installation, and reduce the number of shields. The effect of low weight and cutting energy consumption
Pending Publication Date: 2020-09-29
中交铁道设计研究总院有限公司
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Problems solved by technology
However, traditional air pressure balance shields are difficult to maintain air pressure in formations with high air permeability coefficients, and water is prone to gushing in water-rich sand layers. Auxiliary measures such as precipitation or grouting and water sealing are required to balance the excavation surface, and cannot achieve automatic balance in the state of excavation. The excavation surface; the improved local air pressure shield still has the problems of difficulty in continuous excavation and air leakage in the air pressure chamber
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[0029] The present invention will be described more fully below using examples. This invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.
[0030] For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" may be used herein to describe the relationship of one element or feature relative to another element or feature shown in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientatio...
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The invention discloses a shield device for excavation of various sections and a construction method. A shield body is free of a cutter head. The shield body comprises a shield shell, an air pressurebin, a slurry water bin, a rotary jet grouting mechanism, a slurry spraying pipe, an air pressure pipeline system and a slurry pipeline system. The air pressure bin is disposed at the front end of theshield body. The slurry water bin is disposed behind the air pressure bin. A plurality of rotary jet grouting pipes are disposed in the air pressure bin. Rotary jet grouting working faces of the rotary jet grouting pipes are overlapped to cover an excavation face of a tunnel. The slurry spraying pipe is disposed in the air pressure bin and sprays high-concentration slurry to the excavation face so that a slurry protection wall can be automatically formed under the action of air pressure. A slurry pool is disposed at the bottom of the air pressure bin, and a cut soil body enters the slurry pool to be stirred and then enters the slurry water bin and is then discharged by a slurry discharge pipe. The shield device balances the excavation face jointly by the slurry protection wall and compressed air at a tunneling state. By means of the shield device, excavation of the tunnel with various sections (including large sections) can be realized, and the problems of stratum air leakage, water-rich sand layer gushing, air pressure bin air leakage and continuous soil output difficulty of a traditional air pressure balanced shield are solved.
Description
technical field [0001] The invention relates to the field of tunnel engineering or tunnel shield technology, in particular to a shield device and a construction method for excavating various sections. Background technique [0002] According to the function and force of the tunnel, it is more reasonable to adopt rectangular, horseshoe-shaped, oval, straight-wall arched, multi-centered circular and other cross-sectional forms than circular cross-sections, which can reduce the excavation area, lining engineering amount, muck disposal amount and backfilling Reduce the amount of concrete, thereby improving construction efficiency and space utilization, and reducing the total cost of the project. At present, Japan has developed a variety of special-shaped shields with specially designed cutterheads such as rectangles, horseshoes, ovals, and multi-center circles. They all use specially designed cutterheads, and the design of the cutterheads is very complicated. Therefore, it is ne...
Claims
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IPC IPC(8): E21D9/06E21D9/12E21D11/10
CPCE21D9/06E21D9/0607E21D9/12E21D11/105E21D9/03
Inventor 程小虎
Owner 中交铁道设计研究总院有限公司