A construction method for the conversion process of tunnel inclined shaft and positive tunnel excavation
A technology for converting process and construction methods, applied in tunnels, tunnel linings, shaft equipment, etc., can solve problems such as unproposed construction methods, achieve fast implementation, strong system, and reduce surrounding rock disturbance
Active Publication Date: 2022-08-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
In order to control the risk of landslide at the intersection of the inclined shaft entering the main tunnel, the construction method, construction method conversion, and support system are all particularly important. The progress of various technologies and how to effectively combine them have not yet proposed a more systematic construction method
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[0034] The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.
[0035] like Figure 1 to Figure 4 As shown, a support structure for the conversion process of tunnel inclined shaft and main tunnel excavation, including inclined shaft tunnel structure for support, pilot pit support system, main tunnel structure, pre-reinforced structure and support structure at the intersection of inclined shaft and main tunnel ;
[0036] further, as figure 1As shown, the inclined shaft tunnel structure includes the initial branch 1 of the inclined shaft and the second lining 2 of the inclined shaft. The initial branch 1 of the inclined shaft is in contact with the tunnel wall of the supporting inclined shaft, and the second lining 2 of the inclined shaft is arranged on the outer wall of the initial branch 1 of the inclined shaft. To jo...
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The invention discloses a construction method for the excavation conversion process of a tunnel inclined shaft and a positive tunnel, and relates to the field of tunnel construction. Lining constitutes the main tunnel structure for construction; before excavation and conversion, use locking foot anchor pipe, steel flower pipe, initial support steel frame of inclined shaft, concrete buttress, and temporary ballast to pre-reinforce the intersection section to prevent landslide disasters; door-shaped guide pit During excavation, a support system consisting of portal arches, steel supporting arch beams, portal-shaped steel frames, steel supporting beams, and portal-shaped steel frame columns was adopted; when the main hole was constructed after conversion, the primary grid steel frame and the portal-shaped steel frame were adopted. The secondary lining lintel ensures the stability of the intersection of the inclined shaft and the main tunnel. This method can ensure the safety of the process of converting the inclined shaft of the tunnel into the main tunnel, greatly reduce the disturbance to the surrounding rock during the construction, and ensure the safety of the construction, and the method considers strengthening reinforcement in special dangerous locations, with strong systematicness and flexible construction. high.
Description
technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for the excavation conversion process of a tunnel inclined shaft and a positive hole. Background technique [0002] With the development of economy and society, the construction length of highway tunnel projects is getting longer and longer. During the construction of highway tunnels, in order to improve the construction efficiency and shorten the construction period, auxiliary passages such as inclined shafts and vertical shafts are often set up, which can also be used as ventilation passages for extra-long tunnels after operation. However, due to the large construction section of the highway tunnel, when the inclined shaft of the tunnel is transferred to the main tunnel, it will face problems such as stress concentration of the rock mass and complicated process conversion, which is easy to cause geological disasters such as landslides, which directly aff...
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IPC IPC(8): E21D9/14E21D11/10E21D11/18
CPCE21D9/14E21D11/10E21D11/18Y02E10/20
Inventor 龚伦范正业孔超钟奎周平雷震
Owner SOUTHWEST JIAOTONG UNIV