CN220336904U - Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch - Google Patents
Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch Download PDFInfo
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- CN220336904U CN220336904U CN202321348831.9U CN202321348831U CN220336904U CN 220336904 U CN220336904 U CN 220336904U CN 202321348831 U CN202321348831 U CN 202321348831U CN 220336904 U CN220336904 U CN 220336904U
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Abstract
本实用新型提供了一种隧道洞口连接段过泥石流沟的明洞结构，在暗挖隧道洞门墙外设置一定长度的明洞结构；所述明洞结构包括与暗挖隧道衬砌连接的明洞衬砌、明洞基础、明洞靠山侧挡墙、明洞衬砌上部的泥石流排导槽与护坡，以及用于填充各部件间空隙的钢筋石笼回填层、细石砼保护层及石渣回填区。本实用新型所述明洞结构既通过挡墙对泥石流进行阻拦又通过明洞衬砌上部排导槽对泥石流进行疏导，具有防止泥石流灾害对隧道洞口连接段破坏，保障过泥石流沟隧道正常通行的优点。
The utility model provides an open hole structure in which the connecting section of the tunnel entrance passes through the debris flow ditch. An open hole structure of a certain length is set outside the door wall of the underground tunnel; the open hole structure includes an open hole connected to the lining of the underground tunnel. Lining, open tunnel foundation, open tunnel side retaining wall, debris flow guide channel and slope protection on the upper part of the open tunnel lining, as well as the reinforced gabion backfill layer, fine stone concrete protective layer and gravel backfill area used to fill the gaps between various components . The open tunnel structure of the utility model not only blocks the debris flow through the retaining wall but also guides the debris flow through the upper drainage channel of the open tunnel lining. It has the advantages of preventing debris flow disasters from damaging the tunnel entrance connection section and ensuring the normal passage of the tunnel through the debris flow ditch. .
Description
Technical Field
The utility model relates to an open cut tunnel structure for a connection section of a subsurface tunnel portal to pass through a debris flow trench, which is suitable for the field of tunnel engineering.
Background
The mountainous areas in southwest of China have complex terrains, and a large number of mountain tunnels are required to be constructed in order to shorten mileage. Because the water quantity is abundant in the southwest area in the flood season, landslide disasters are frequent, a large amount of debris flow accumulation in the gully easily washes down the roadbed of the connecting section of the tunnel portal under the rainfall effect, and the debris flow accumulation flows into the undercut tunnel through the tunnel portal to block traffic and influence the operation safety.
Disclosure of Invention
The utility model aims to provide an open cut tunnel structure for enabling a large amount of debris flow accumulation in a gully to easily wash down a roadbed at a connecting section of a tunnel opening, and a construction method thereof.
For this purpose, the above object of the present utility model is achieved by the following technical solutions:
open cut tunnel structure of mud-rock flow ditch is crossed to undercut tunnel portal linkage segment, its characterized in that: setting an open cut tunnel structure with a certain length outside a wall of the underground excavation tunnel portal;
the open cut tunnel is connected with the undercut tunnel, and a debris flow drainage groove connected with the gully is formed in the top of the open cut tunnel structure, so that debris flows through the debris flow drainage groove to cross the top of the open cut tunnel and drain to the lower side of the open cut tunnel structure.
On the basis of adopting the technical scheme, the utility model can also adopt the following further technical schemes or use the further technical schemes in combination:
the open cut tunnel structure comprises an open cut tunnel lining, an open cut tunnel side retaining wall, an open cut tunnel foundation, a slope protection above the open cut tunnel, a reinforced gabion backfill layer for filling gaps among all the components, a fine-stone concrete protective layer and a stone slag backfill area; the open cut tunnel lining is arranged on the open cut tunnel foundation, the open cut tunnel lining is connected with the lining of the undercut tunnel, the fine stone concrete protection layer is arranged on the outer surface of the open cut tunnel lining, the reinforced concrete gabion backfill layer is arranged at the top of the rock residue backfill area, and the debris flow drainage groove is arranged on the rock residue backfill area. In the scheme, a C20 concrete pouring is adopted for the open cut tunnel foundation, an anchor rod is arranged in front of the original roadbed retaining wall for connection, and the anchor rod penetrates through the original roadbed retaining wall and is embedded into bedrock;
the cross section of the debris flow drainage groove is trapezoidal and is in a horn-shaped structure in space, the debris flow drainage groove is widened from top to bottom, and the groove depth is gradually shallower.
The mud-rock flow drainage groove adopts reinforced concrete pouring, and a double-layer reinforcing steel mesh is paved at the top, so that the wear resistance is enhanced.
A first retaining wall (31) is arranged on the mountain side of the open cut tunnel; c15 concrete and stone slag are adopted to backfill the retaining wall and the open cut tunnel from bottom to top in sequence, and the stone slag backfill area is arranged at the top; and the stone residue backfilling area is arranged in the space on the mountain leaning side of the first retaining wall.
And a second retaining wall is arranged at a position closer to the mountain body, and the gap between the two retaining walls is backfilled by stone slag.
The debris flow drainage groove and the open cut tunnel mountain side retaining wall are jointly arranged, the debris flow drainage groove is arranged above the second retaining wall, and the debris flow drainage groove is arranged at the top of the open cut tunnel foundation after being lined above the open cut tunnel.
The method comprises the steps of firstly laying a fine stone concrete protection layer on the upper part of the open cut tunnel lining, and then laying a reinforced gabion backfill layer which is connected with a debris flow drainage groove on the upper part of the open cut tunnel lining.
Along the axis direction of the tunnel, slope protection is arranged between the upward slope of the underground excavation tunnel opening and the mud-rock flow drainage groove, and gaps between the slope protection and the open cut tunnel lining are filled with reinforced concrete gabion backfill layers under the slope protection.
When both ends of the open cut tunnel structure are connected with the underground excavation tunnel portal wall, the open cut tunnel structure is provided with an evacuation channel, the open cut tunnel structure far away from the side of the evacuation channel is poured in advance, and the evacuation channel is used as a construction channel to pour the rest section of open cut tunnel structure.
According to the open cut tunnel structure, the retaining wall is used for blocking the debris flow and the drainage groove at the upper part of the open cut tunnel lining is used for dredging the debris flow, so that the damage of the debris flow disaster to the connecting section of the tunnel opening is prevented, and the normal passing of the tunnel passing through the debris flow channel is ensured.
Drawings
Fig. 1 is a plan view of an open cut tunnel structure according to an embodiment.
Fig. 2 is a longitudinal section view of the open cut tunnel structure in the embodiment, that is, a section view A-A in fig. 1.
Fig. 3 is a cross-sectional view of the open cut tunnel structure of the embodiment, i.e., a section B-B of fig. 1.
Detailed Description
As shown in fig. 1 to 3, the utility model discloses an open cut tunnel structure for a connecting section of a hidden tunnel portal to pass through a debris flow ditch, which comprises the following steps: setting an open cut tunnel structure with a certain length outside a wall of the underground excavation tunnel portal; the open cut tunnel is connected with the underground tunnel, and a debris flow drainage groove 4 connected with the gully is arranged at the top of the open cut tunnel structure, so that debris flows through the debris flow drainage groove 4 to span the top of the open cut tunnel and is drained to the lower side of the open cut tunnel structure.
The open cut tunnel structure comprises an open cut tunnel lining 1, an open cut tunnel side retaining wall, an open cut tunnel foundation 2, a slope protection 5 positioned above the open cut tunnel, a reinforced gabion backfill layer 6 for filling gaps among all the components, a fine stone concrete protective layer 7 and a stone slag backfill area 8; the open cut tunnel lining 1 is arranged on the open cut tunnel foundation 2, the open cut tunnel lining 1 is connected with the lining of the undercut tunnel, the fine stone concrete protection layer 7 is positioned on the outer surface of the open cut tunnel lining 1, the reinforced gabion backfill layer 6 is positioned at the top of the rock residue backfill area 8, and the debris flow drainage groove 4 is arranged on the rock residue backfill area 8.
The open cut tunnel mountain side retaining wall comprises a first retaining wall 31 and a second retaining wall 32, and the first retaining wall 31 is arranged on the open cut tunnel mountain side; c15 concrete and stone slag are adopted to backfill the retaining wall and the open cut tunnel from bottom to top in sequence, and a stone slag backfill area 8 is arranged at the top; the stone residue backfill area 8 is arranged in the space on the side of the backer of the first retaining wall 31. A second retaining wall 32 is provided at a position closer to the mountain, and the gap between the two retaining walls is backfilled with stone slag.
As shown in fig. 1, in order to prevent the debris flow from blocking and accumulating in the drainage groove, the debris flow drainage groove 4 at the upper part of the open cut tunnel structure in this embodiment is designed to be a horn-shaped structure, i.e., narrow and tall near the mountain side and wide and short far from the mountain side. The bottom of the drainage groove is downwards inclined to the top of the first retaining wall 31 along the 10% gradient from the top of the second retaining wall 32, and then downwards inclined to the top of the open cut tunnel foundation 2 at the mountain side along the 20% gradient; the discharge groove was 5m wide on the near mountain side and then gradually widened, and finally 15m wide at the exit on the far mountain side. In order to prevent the debris flow from scouring, the debris flow drainage groove in the embodiment adopts C35 reinforced concrete pouring, and a double-layer reinforcing steel mesh is paved on the top, so that the wear resistance is enhanced.
As shown in fig. 2 and 3, a reinforced gabion backfill layer 6 is adopted to fill the gap between the open cut tunnel lining 1 and the debris flow drainage groove 4; in order to prevent the reinforced gabion backfill layer 6 from damaging the open cut tunnel lining, a C20 fine stone concrete protective layer 7 with the length of 7cm is paved on the upper part of the open cut tunnel lining.
As shown in fig. 2, in this embodiment, along the tunnel axis direction, a concrete slope protection 5 is set between the elevation slope of the underground excavation tunnel hole and the mud-rock flow drainage groove 4 at a slope ratio of 1:10, and the gap between the concrete slope protection 5 and the open cut tunnel lining 1 is filled with a reinforced gabion backfill layer 6.
As shown in fig. 2, in this embodiment, the open cut tunnel structure is implemented in sections, that is, the open cut tunnel structure far away from the reserved lateral channel side is firstly constructed after the retaining wall is completed, and the rest is taken as a hole top backfill construction space; and the open cut tunnel of the post pouring section adopts a reserved transverse channel as a construction channel to carry out material lifting.
As shown in fig. 3, the open cut tunnel foundation 2 is poured by adopting C20 concrete, is connected with an phi 25 anchor rod arranged in front of the original roadbed retaining wall, and is penetrated through the original roadbed retaining wall and embedded into bedrock.
It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that various changes, additions and substitutions can be made by those skilled in the art without departing from the scope of the utility model.
Claims (10)
1. Open cut tunnel structure of mud-rock flow ditch is crossed to undercut tunnel portal linkage segment, its characterized in that: setting an open cut tunnel structure with a certain length outside a wall of the underground excavation tunnel portal;
the open cut tunnel is connected with the undercut tunnel, and a debris flow drainage groove (4) connected with the gully is arranged at the top of the open cut tunnel structure, so that debris flows through the debris flow drainage groove (4) to cross the top of the open cut tunnel and drain to the lower side of the open cut tunnel structure.
2. Open cut tunnel structure according to claim 1, characterized in that: the open cut tunnel structure comprises an open cut tunnel lining (1), an open cut tunnel side retaining wall, an open cut tunnel foundation (2), a slope protection (5) positioned above the open cut tunnel, a reinforced gabion backfill layer (6) for filling gaps among all the components, a fine stone concrete protection layer (7) and a stone slag backfill area (8); open cut tunnel lining (1) sets up on open cut tunnel basis (2), and open cut tunnel lining (1) links up with the lining up in undercut tunnel, and fine stone concrete protective layer (7) are located the surface of open cut tunnel lining (1), and reinforced bar gabion backfill layer (6) are located the top of stone sediment backfill district (8), and mud-rock flow drainage groove (4) set up on stone sediment backfill district (8).
3. Open cut tunnel structure according to claim 1, characterized in that: the cross section of the debris flow drainage groove (4) is trapezoidal and is in a horn-shaped structure in space, the debris flow drainage groove is widened from top to bottom, and the groove depth is gradually shallower.
4. Open cut tunnel structure according to claim 1, characterized in that: the mud-rock flow drainage groove (4) adopts reinforced concrete pouring, and a double-layer reinforcing mesh is paved at the top, so that the wear resistance is enhanced.
5. An open cut tunnel structure according to claim 2, wherein: a first retaining wall (31) is arranged on the mountain side of the open cut tunnel; c15 concrete and stone slag are adopted to backfill the retaining wall and the open cut tunnel from bottom to top in sequence, and a stone slag backfill area (8) is arranged at the top; the stone slag backfilling area (8) is arranged in the space on the side of the backer of the first retaining wall (31).
6. The open cut tunnel structure of claim 5, wherein: and a second retaining wall (32) is arranged at a position closer to the mountain body, and the gap between the two retaining walls is backfilled by stone slag.
7. The open cut tunnel structure of claim 6, wherein: the debris flow drainage groove (4) and the open cut tunnel backer side retaining wall are arranged in a combined mode, the debris flow drainage groove is arranged above the second retaining wall (32), and the debris flow drainage groove is arranged at the top of the open cut tunnel foundation (2) after passing through the upper part of the open cut tunnel lining (1).
8. An open cut tunnel structure according to claim 2, wherein: the upper part of the open cut tunnel lining (1) is firstly laid with a fine stone concrete protection layer (7), and then is laid with a reinforced gabion backfill layer (6) which is connected with a debris flow drainage groove (4) at the upper part of the open cut tunnel lining.
9. The open cut tunnel structure according to claim 1, wherein a slope protection (5) is arranged between a downhill slope of a tunnel opening to a debris flow drainage groove (4) along the axial direction of the tunnel, and a gap between the slope protection (5) and the open cut tunnel lining (1) is filled with a reinforced gabion backfill layer (6) under the slope protection.
10. Open cut tunnel structure according to claim 1, characterized in that: when both ends of the open cut tunnel structure are connected with the underground excavation tunnel portal wall, the open cut tunnel structure is provided with an evacuation channel, the open cut tunnel structure far away from the side of the evacuation channel is poured in advance, and the evacuation channel is used as a construction channel to pour the rest section of open cut tunnel structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321348831.9U CN220336904U (en) | 2023-05-30 | 2023-05-30 | Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321348831.9U CN220336904U (en) | 2023-05-30 | 2023-05-30 | Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch |
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| CN220336904U true CN220336904U (en) | 2024-01-12 |
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| CN202321348831.9U Active CN220336904U (en) | 2023-05-30 | 2023-05-30 | Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116816375A (en) * | 2023-05-30 | 2023-09-29 | 中国电建集团华东勘测设计研究院有限公司 | Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch |
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2023
- 2023-05-30 CN CN202321348831.9U patent/CN220336904U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116816375A (en) * | 2023-05-30 | 2023-09-29 | 中国电建集团华东勘测设计研究院有限公司 | Open cut tunnel structure for connecting section of underground excavation tunnel portal to pass through debris flow ditch |
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