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Constructing method for in tunnel weak soil layer by freezing method horizontally

A technology for connecting channels and construction methods, which is applied in the field of construction engineering, and can solve problems such as unintroduced permafrost support methods and unexposed permafrost

Inactive Publication Date: 2005-05-11
SHANGHAI TUNNEL ENGINEERING CO. LTD.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned freezing construction method is widely used in various constructions through unstable alluvium and fractured aquifers at present, but there are following deficiencies: (1) the freezing curtain is only used as a foundation pit water sealing structure, and the frozen soil is not exposed during the foundation pit excavation process. , did not introduce the support method used when the permafrost is exposed
(3) There is no description of the technical measures to control the thawing of permafrost

Method used

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Examples

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Embodiment Construction

[0032] Provide following construction example in conjunction with content of the present invention:

[0033] Taking the construction of a horizontal frozen connecting channel in a cross-river tunnel project as an example, there are two connecting channels between two river-crossing tunnels, both located at the bottom of the river, with a distance of about 400m. The net distance of the connecting passage (1) is 25.665m, and the height difference between the tunnels is 3.565m; the net distance of the connecting passage (2) is about 17.175m, and the height difference between the tunnels is 0.345m.

[0034] (1) Determination of freezing main technical indicators;

[0035] ①Frozen brine temperature: Active period: -30℃~-32℃

[0036] Maintenance period: -24℃~-26℃;

[0037] ②Average temperature of frozen soil wall: -8℃~-10℃;

[0038] ③ Frozen soil strength: δ 压 =3.4Mpa~4.5Mpa; δ 拉弯 =1.8Mpa~2.3Mpa; δ 剪 =1.5Mpa

[0039] ④ Thickness of freezing wall: thickness o...

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Abstract

A horizontal freezing method for constructing the tunnel in soft stratum includes such steps as determining the saline temp in active freezing period and maintaining freezing period, the average temp of frozen earth wall and the strength of frozen earth, designing and arranging the freezing hole, calculating the cold needed by freezing, excavating the horn-shaped portal tunnel segments at both ends, excavating middle segments, and enlarging the tunnel.

Description

technical field [0001] The invention relates to a construction method for a connecting channel, in particular to a construction method for a horizontally frozen connecting channel in a soft soil layer, which is used in the technical field of construction engineering. Background technique [0002] In the 1860s, the freezing method was first applied to building foundation engineering in South Wales, England. In 1883, German engineer P.H.Potsch successfully constructed a 103m-deep shaft in the Albari coal mine by freezing method, and obtained a patent for freezing technology, which attracted worldwide attention. All countries in the world have widely used freezing technology, which has promoted the development of freezing technology. Freezing method started relatively late in our country, but its development speed is very fast. Since the first application of the freezing method to drill wells in the Kailuan mining area in 1955, the freezing method has developed into the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/115E02D29/063
Inventor 杨国祥丁光莹朱俊翁家杰章仁财段如同岳丰田秦一雄
Owner SHANGHAI TUNNEL ENGINEERING CO. LTD.
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