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A construction method of arch-connected tunnel with small clear distance in mountainous area
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A technology for expressway and tunnel construction, which is applied to tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of difficult construction and many bridges connected to tunnels, and achieve the effect of simple construction methods, less interference, and clear ideas
Active Publication Date: 2022-06-24
四川省交通勘察设计研究院有限公司
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[0003] The technical problem to be solved by the present invention is that in the prior art, there are many bridge-connected tunnels, and the design and construction are relatively difficult. , low cost features
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Embodiment example 1
[0039] Implementation case 1: A construction method for a small clear distance tunnel connected by arches on a mountain expressway, in which area A is the first construction branch hole, and area B is the hole used to connect the first construction branch hole and the right side of the split section opening Body section, area C is the second construction branch hole, area D is the body section used to connect the second construction branch hole and the left hole separated section opening, and area E is used to connect the first construction branch hole and the right hole with the arch section The ultra-small clear distance section and the small clear distance section, the F area is the middle pilot tunnel of the connecting arch section, the G area is the connecting arch section of the right hole, and the H area is the ultra-small space used to connect the second construction support tunnel and the connecting arch section of the left hole. The small clear distance and the small ...
Embodiment example 2
[0058] Implementation case 2: The separate section adopts a separate lining structure, the small clear distance section adopts a small clear distance lining structure, and the multi-arch section adopts a multi-arch lining structure. In the left line H area, the clear distance is less than 6m. The non-joint arch section is excavated with a milling machine or a cantilever roadheader. The weakest part of the small clear distance tunnel is the middle rock wall, and the damage of the middle rock wall starts from the arch waist position on the side of the leading hole. Therefore, the middle rock wall is the focus of the monitoring and measurement of the small clear distance tunnel, and the focus of the monitoring and measurement of the middle rock wall is the position of the arch waist on the side of the leading hole.
[0059] In the ultra-small clear distance non-joint arch section with clear distance less than 6m in the left line H area, the blasting rate should be controlled durin...
Embodiment example 3
[0060] Implementation case 3: The tunnel excavation method is selected according to the geological conditions, and the excavation method is adjusted according to the deformation convergence.
[0061] In order to facilitate the assembly of the secondary lining trolley, the excavation clearance in the main hole of the secondary lining trolley is expanded by 50cm, and the secondary lining concrete of the same level is used for backfilling.
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Abstract
The invention discloses a construction method for a multi-arch-connected small clear-distance tunnel on an expressway in mountainous areas, which belongs to the technical field of expressway tunnels, and comprises the following steps: constructing area A, constructing auxiliary tunnel construction branch holes, excavating area E first, After the excavation, do the initial support in time, and then close the face of the E area, and suspend the excavation of the E area; then excavate the B area, and carry out the construction of the large pile number section of the right hole. In area C, excavate the second construction branch hole between the left and right holes, and build the second lining lining at the intersection of A, B, C, and E areas, complete the intersection lock, excavate 50m in area H, and Afterwards, the initial support was implemented in time, and then the face of the H area was closed, and the excavation of the H area was suspended; the D area was then constructed, and the construction of the large stake section of the left hole was carried out; while the D area was being constructed, the H area had been completed The two lining trolleys are assembled in the excavated cavern, and the invention enters the small clear distance section through the construction branch hole, and then excavates to both ends respectively.
Description
technical field [0001] The invention belongs to the technical field of expressway tunnels, and in particular relates to a construction method of a small clear distance tunnel connected by arches on a mountain expressway. Background technique [0002] In recent years, more and more mountain expressways have been planned and constructed. Expressways have brought great convenience to mountain traffic. However, since the expressway is a high-grade highway, the linear index is required to be high, the terrain in the mountainous area is steep and the undulations are large, and more and more tunnels and bridges have appeared. bigger. More and more bridges are connected to tunnels on highways in mountainous areas, especially the bridge sections where the entrance is connected to the entire width. There is no construction site at the entrance, and auxiliary tunnel construction is required. The tunnel is a continuous arch opening connected to a small clear distance opening and then ...
Claims
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Application Information
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