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Large-size rectangular pipe jacking construction method for upper-soft lower-hard stratum

A technology of rectangular pipe jacking and construction method, which is applied in earthwork drilling, mining equipment, tunnels, etc., can solve the problems of lack of construction technology and large-scale rectangular pipe jacking construction, and achieves improved construction efficiency, good lubrication, The effect of high construction safety

Pending Publication Date: 2022-01-18
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] There has been no solution to the construction of large-size rectangular pipe jacking in complex strata with soft top and hard bottom, and there is no similar construction technology in related technologies

Method used

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  • Large-size rectangular pipe jacking construction method for upper-soft lower-hard stratum
  • Large-size rectangular pipe jacking construction method for upper-soft lower-hard stratum
  • Large-size rectangular pipe jacking construction method for upper-soft lower-hard stratum

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0041] In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, so as to Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

[0042] refer to Figure ...

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Abstract

The invention discloses a large-size rectangular pipe jacking construction method for an upper-soft lower-hard stratum, and belongs to the technical field of pipe jacking construction. The large-size rectangular pipe jacking construction method for the upper-soft lower-hard stratum comprises the following steps that S01, hard rock pretreatment is conducted, specifically, hard rock invading a pipe jacking tunnel is subjected to pre-crushing treatment; S02, the excavation diameter is enlarged, specifically, a cutter head is adjusted, and the excavation diameter of the bottom of a pipe jacking machine is enlarged; S03, pressure injection of slurry and a thickening agent is conducted, specifically, the slurry and the thickening agent are pressure-injected in front of the cutter head, so that the workability of a soil body is improved, the pressure of the soil body is balanced, and the excavation surface of a sand layer is kept stable; S04, anti-sedimentation treatment is conducted, specifically, high-consistency bentonite is injected into the periphery of the duct piece for filling; and S05, posture adjustment is conducted, in the jacking process, axis deviation correction and posture roll correction are conducted on the pipe jacking machine, and jacking accuracy is guaranteed. The technical problems that in upper-soft lower-hard complex geological large-size rectangular pipe jacking construction, the pipe jacking machine floats upwards and rolls left and right are effectively solved.

Description

technical field [0001] The invention relates to the technical field of pipe jacking construction, in particular to a large-size rectangular pipe jacking construction method in upper soft and lower hard strata. Background technique [0002] Large-size rectangular pipe jacking construction is commonly used in the fields of urban subway entrance and exit pedestrian passages, underground parking lots, street crossing passages, and comprehensive pipe corridors. The construction of large-size rectangular pipe jacking avoids the excavation of roads and facilitates transportation. At the same time, its construction safety and high efficiency have attracted more and more attention. [0003] However, the geological conditions of the city are complex, and the existing large-size rectangular pipe jacking construction is generally suitable for soft soil or sandy soil stratum. During the jacking process of the complex formation with upper soft and lower hard, because the cutter head cann...

Claims

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Application Information

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IPC IPC(8): E21D9/08E21D9/00E21D9/06E21D9/093
CPCE21D9/08E21D9/093E21D9/03E21D9/0678E21D9/001
Inventor 张国林吴祯冯宏朝
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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