CN217354388U - Combined retaining type tunnel portal structure suitable for bias steep slope terrain - Google Patents
Combined retaining type tunnel portal structure suitable for bias steep slope terrain Download PDFInfo
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- CN217354388U CN217354388U CN202221442764.2U CN202221442764U CN217354388U CN 217354388 U CN217354388 U CN 217354388U CN 202221442764 U CN202221442764 U CN 202221442764U CN 217354388 U CN217354388 U CN 217354388U
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Abstract
The utility model discloses a combined retaining type tunnel portal structure suitable for bias steep slope terrain, which comprises an open cut tunnel lining and a tunnel portal wall, wherein an anti-slide pile is arranged at the inner side of the open cut tunnel lining close to a mountain body, a bias retaining wall for assisting the filling of a tunnel top and a balance weight type retaining wall for stabilizing a tunnel base foundation are sequentially arranged at the outer side far away from the mountain body, and a supplementary material is arranged between the bias retaining wall and the balance weight type retaining wall; and a wall back backfilling structure is arranged between the anti-slide pile and the offset retaining wall and at the rear part of the tunnel door wall. Through setting up at the open cut tunnel lining cutting and leaning on the anti-slide pile of massif inboard to resist the terrain biasing force, set up the basis that weighing type barricade guaranteed tunnel portal structure stable, set up the biasing barricade and can avoid the hole top backfill to collapse to the massif outside, guarantee that the backfill has good stability, through the collaborative atress of three kinds of retaining structures, can improve the stability and the reliability of tunnel entrance to a cave structure greatly, satisfy the essential condition that tunnel entrance to a cave section open cut tunnel extension was under the steep slope topography of biasing, and can effectively ensure the construction safety and the operation safety of tunnel entrance to a cave section.
Description
Technical Field
The utility model relates to a combination retaining type tunnel portal structure suitable for bias voltage abrupt slope topography belongs to tunnel construction technical field.
Background
Receive the restriction of the whole linear shape of road, tunnel entrance to a cave section may meet with bias voltage abrupt slope topography, and tunnel portal design needs to deal with many difficult problems such as high side and upward slope, structure bias pressure atress this moment, if punishment is improper, then probably leads to the side and upward slope unstability to collapse, accident such as slope body danger stone falls, tunnel structure fracture deformation, and then leaves not little risk hidden danger for construction safety and operation period driving safety. Aiming at the situation, the existing relatively mature treatment scheme is to properly push the tunnel portal structure to the interior of the mountain, guarantee the operability of the construction of the portal by adopting a wall-mounted type hole entering mode, carry out strong protection on the top-high side up slope of the tunnel through structural measures such as anchor cable lattice beams, anchor rod lattice beams and the like, and set an active or passive protective net at the appropriate position of the top side up slope of the tunnel according to the situation. The safety of tunnel entrance to a cave section can be guaranteed to a certain extent to above-mentioned engineering measure, nevertheless has defects such as engineering cost height, great to entrance to a cave environment destruction, and the slope protection effect directly depends on the construction quality of hidden projects such as anchor rope, stock, and the risk controllability is relatively poor.
Lengthening the open cut tunnel is a relatively more reliable countermeasure than strengthening the side-to-side slope protection. However, due to the limitation of the terrain in bias, the tunnel portal section generally has the practical problems of large terrain bias force on the inner side of the slope body, unstable foundation of the structure on the outer side of the slope body and the like, so that the implementation of the scheme for prolonging the open cut tunnel has great condition limitation. In view of the above situation, it is of great practical significance to research a combined supporting and blocking type tunnel portal structure suitable for a bias steep slope terrain.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a combination fender type tunnel portal structure suitable for bias voltage abrupt slope topography can overcome the not enough of prior art.
The utility model aims at realizing through the following technical scheme:
a combined supporting and retaining type tunnel portal structure suitable for a bias steep slope terrain comprises a open cut tunnel lining and a tunnel portal wall, wherein an anti-slide pile is arranged on the inner side, close to a mountain, of the open cut tunnel lining, a bias retaining wall used for assisting in filling soil at the top of a tunnel and a balance type retaining wall used for stabilizing a foundation of a tunnel base are sequentially arranged on the outer side, far away from the mountain, and a supplementary material is arranged between the bias retaining wall and the balance type retaining wall; and a wall back backfilling structure is arranged between the anti-slide pile and the offset retaining wall and at the rear part of the tunnel door wall.
The anti-slide piles are arranged in the open cut tunnel section at intervals.
And rigid connection is established among the door wall, the anti-slide pile, the bias retaining wall and the open cut tunnel lining through connecting steel bars.
And the door wall and the bias baffle wall are both provided with drain holes.
The supplementary material is C20 concrete.
The top of the door wall is higher than the vault lining of the tunnel, and the height of the door wall is determined according to the height of a wall back backfilling structure.
The wall back backfilling structure comprises a C15 concrete backfill layer, a soil and stone backfill layer and a clay water-resisting layer which are arranged from bottom to top, and a green plant layer is arranged at the top of the clay water-resisting layer.
And a communicated tunnel top ditch is arranged at the top of the wall back backfilling structure and the biased retaining wall.
Compared with the prior art, the utility model discloses a combination retaining type tunnel portal structure suitable for bias steep slope topography, it includes open cut tunnel lining and tunnel portal wall, is equipped with anti-slide pile in the inboard that open cut tunnel lining is close to the massif, and the outside of keeping away from the massif is equipped with the bias voltage barricade that is used for assisting the hole top to fill in soil and is used for making the balanced type barricade of tunnel base foundation stability in proper order, is equipped with the help material between bias voltage barricade and balanced type barricade; a wall back backfilling structure is arranged between the anti-slide pile and the bias retaining wall and at the rear part of the tunnel door wall; the cave door wall, the anti-slide pile, the bias type retaining wall structure and the open cut tunnel lining are mutually nested and connected, and the top surfaces of the cave door wall and the bias type retaining wall structure are mutually flush, so that a relatively flat combined retaining cave door structure is formed. The anti-slide piles arranged on the inner side of the mountain body close to the open cut tunnel lining are used for resisting terrain biasing force, the balance weight type retaining wall is arranged to ensure that the foundation of the tunnel portal structure is stable, the bias pressure retaining wall is arranged to meet the engineering requirement of backfill at the tunnel open cut tunnel section tunnel top, the tunnel top backfill is prevented from collapsing to the outer side of the mountain body, the backfill is ensured to have good stability, the necessary conditions of extension construction of the tunnel portal section open cut tunnel under the bias steep slope terrain can be effectively met through the synergistic stress of the three retaining structures, and the structural reliability and the protection effectiveness of the tunnel portal structure are ensured.
The beneficial effects of the utility model are that:
(1) the utility model discloses a set up the biasing force that the friction pile resists the entrance to a cave section massif, set up the basis that the balance weight barricade guarantees tunnel portal structure is stable, set up the bias voltage barricade in order to satisfy the engineering demand that the tunnel open cut tunnel section hole top backfilled, through the collaborative atress of three kinds of retaining structures, can improve the stability and the reliability of tunnel portal structure greatly, be particularly useful for the construction of bias voltage abrupt slope tunnel, the good reliability, application scope is wide; (2) the utility model discloses can effectively reduce the tunnel operation phase and suffer the safety threat that hole topside adverse slope local landslide, danger stone roll off to the overall stability of hole topside adverse slope is promoted through the measure that open cut tunnel backpressure was backfilled, the construction safety and the operation safety of tunnel entrance to a cave section can effectively be ensured.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a backfill schematic diagram of a wall back backfill structure.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are presented for purposes of illustration only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1-3, a combined retaining type tunnel portal structure suitable for a bias steep slope terrain comprises an open cut tunnel lining 5 and a portal wall 6, wherein an anti-slide pile 1 is arranged on the inner side of the open cut tunnel lining 5 close to a mountain, a bias retaining wall 3 for assisting the filling of a tunnel roof and a balance weight retaining wall 2 for stabilizing a tunnel base foundation are sequentially arranged on the outer side far away from the mountain, and a supplementary material 4 is arranged between the bias retaining wall 3 and the balance weight retaining wall 2; a wall back backfill structure 8 is arranged between the slide-resistant pile 1 and the offset retaining wall 3 and at the rear part of the tunnel portal wall 6; the tunnel portal wall 6 is connected with the anti-slide pile 1, the bias retaining wall 3 and the open cut tunnel lining 5 in a mutually nested manner, and the surfaces of the tunnel portal wall and the bias retaining wall are mutually flush, so that a relatively flat combined retaining type tunnel portal structure is formed.
Specifically, the bias retaining wall 3 is arranged close to the outer side of the open cut tunnel lining 5 and can be used as a secondary supporting and blocking structure for resisting mountain bias and a side blocking structure of a tunnel portal wall back backfill 8; the balance weight type retaining wall 2 is opposite to the bias retaining wall 3 in position and is arranged in a stable foundation on the outermost side of the bias terrain of the tunnel opening to serve as a supporting and blocking structure for the slope retraction of the outer edge of the tunnel portal structure foundation, so that the tunnel foundation is stable; the supplementary material 4 arranged between the bias retaining wall 3 and the balance retaining wall 2 is used for supplementing and filling the hollow part of the tunnel portal foundation, the mechanical property of the used material should meet the related bearing capacity requirement, and a relatively light material is preferably selected to reduce the stress load of the balance retaining wall 2, preferably C20 concrete is selected.
The anti-slide piles 1 are arranged in the open cut tunnel section at intervals and serve as main retaining structures for resisting the biasing force of the mountain. The number of the anti-slide piles 1 is determined according to the length of the open cut tunnel, and the center distance between adjacent anti-slide piles is generally controlled to be 4-5 m.
Rigid connection is established between the tunnel portal wall 6 and the anti-slide pile 1, the bias retaining wall 3 and the open cut tunnel lining 5 through connecting steel bars, so that the overall stability of the combined supporting and retaining tunnel portal structure is improved.
And the door wall 6 and the bias retaining wall 3 are both provided with drain holes to ensure that accumulated water on the back of the wall is drained smoothly.
The counterbalanced retaining wall 2 and the biased retaining wall 3 are of plain concrete construction.
The top of the portal wall 6 is higher than the vault lining of the tunnel, the specific height of the portal wall is flexibly adjusted according to the height of the wall back backfilling structure 8, and the height of the portal wall is not less than 0.5m higher than the top surface of the wall back backfilling structure 8. Meanwhile, the protective structure can be used as a passive protective structure for blocking landslides or rolling objects on the surface layer of the top side of the tunnel, and the landslides or rolling objects are prevented from directly falling onto the road to influence the driving safety.
The backfill area of the wall back backfill structure 8 is a closed space surrounded by an anti-slide pile 1, a bias retaining wall 3, an open cut tunnel lining 5, a hole door wall 6, an upward slope excavation surface and a foundation; specifically, the wall back backfill structure 8 comprises a C15 concrete backfill layer 8.1, a soil and stone backfill layer 8.2 and a clay water-resisting layer 8.3 which are arranged from bottom to top, a green plant layer is arranged on the top of the clay water-resisting layer 8.3, and grass planting greening can be carried out on the green plant layer.
And a through hole top ditch 7 is arranged at the top of the wall back backfill structure 8 and the bias retaining wall 3, and the hole top ditch 7 can be used as a drainage channel for surface rainwater in the tunnel entrance area.
The specific construction process comprises the following steps:
1) after the construction of the tunnel portal section intercepting drainage structure is completed, necessary side and up slope protection construction is carried out, and then anti-slide piles 1 on one side, close to the mountain, of the line are constructed;
2) after the construction of the anti-slide pile 1 is completed, the excavation construction of a tunnel entrance section is carried out, and then the construction of a line backer body outer side weighing type retaining wall 2 is carried out;
3) after the construction of the balance weight type retaining wall 2 is completed, leveling the site of the tunnel entrance section, and filling and rolling the hollow part of the foundation by using a supplementary material 4; if the bearing capacity of the foundation at the hole opening section is insufficient, carrying out corresponding foundation reinforcement treatment;
4) constructing a cover arch and a tunnel portal section pipe shed, then carrying out tunnel blind hole construction under the protection of the pipe shed, and constructing a tunnel portal section secondary lining and open cut tunnel lining 5 as soon as possible after about 15m of upper section excavation of the tunnel blind hole;
5) and after the open cut tunnel lining 5 is constructed, constructing the bias retaining wall 3 and the portal wall 6, and then performing the backfill 8 of the back of the portal wall and the construction of the tunnel top ditch 7, thereby completing the whole construction of the combined retaining type tunnel portal structure.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, which is confidential, and any simple modification, equivalent change and modification made by the technical entity of the present invention to the above embodiments do not depart from the technical solution of the present invention.
Claims (8)
1. The utility model provides a combination props up fender type tunnel portal structure suitable for bias voltage abrupt slope topography, includes open cut tunnel lining (5) and hole portal wall (6), its characterized in that: an anti-slide pile (1) is arranged on the inner side of the open cut tunnel lining (5) close to the mountain, a bias retaining wall (3) used for assisting the top filling of the tunnel and a balance weight retaining wall (2) used for stabilizing the foundation of the tunnel foundation are sequentially arranged on the outer side far away from the mountain, and a supplementary material (4) is arranged between the bias retaining wall (3) and the balance weight retaining wall (2); and a wall back backfill structure (8) is arranged between the anti-slide pile (1) and the bias retaining wall (3) and at the rear part of the tunnel door wall (6).
2. The composite support and blocking type tunnel portal structure suitable for biasing steep slope terrain as claimed in claim 1, wherein: the anti-slide piles (1) are arranged in the open cut tunnel section at intervals.
3. The combined retaining tunnel portal structure adapted for biasing steep slope terrain according to claim 1 or 2, wherein: the opening door wall (6) is rigidly connected with the anti-slide pile (1), the bias retaining wall (3) and the open cut tunnel lining (5) through connecting steel bars.
4. The modular spur tunnel portal structure for biasing steep slope terrain as in claim 3, wherein: and the door wall (6) and the bias retaining wall (3) are both provided with water drainage holes.
5. The modular spur tunnel portal structure for biasing steep slope terrain as in claim 3, wherein: the supplementary material (4) is C20 concrete.
6. The modular spur tunnel portal structure for biasing steep slope terrain as in claim 3, wherein: the top of the tunnel portal wall (6) is higher than the vault lining of the tunnel, and the height of the tunnel portal wall is determined according to the height of the wall back backfill structure (8).
7. The modular spur tunnel portal structure for biasing steep slope terrain as in claim 6, wherein: the wall back backfill structure (8) comprises a C15 concrete backfill layer (8.1), an earth and stone backfill layer (8.2) and a clay water-resisting layer (8.3) which are arranged from bottom to top, and a green plant layer is arranged at the top of the clay water-resisting layer (8.3).
8. The modular spur tunnel portal structure for biasing steep slope terrain as in claim 3, wherein: and a communicated tunnel top ditch (7) is arranged at the top of the wall back backfill structure (8) and the biased retaining wall (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442764.2U CN217354388U (en) | 2022-06-10 | 2022-06-10 | Combined retaining type tunnel portal structure suitable for bias steep slope terrain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442764.2U CN217354388U (en) | 2022-06-10 | 2022-06-10 | Combined retaining type tunnel portal structure suitable for bias steep slope terrain |
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| CN217354388U true CN217354388U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221442764.2U Active CN217354388U (en) | 2022-06-10 | 2022-06-10 | Combined retaining type tunnel portal structure suitable for bias steep slope terrain |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052421A (en) * | 2023-10-13 | 2023-11-14 | 湖南省通盛工程有限公司 | Tunnel portal supporting structure in deep slippage and large bias state and construction method |
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2022
- 2022-06-10 CN CN202221442764.2U patent/CN217354388U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052421A (en) * | 2023-10-13 | 2023-11-14 | 湖南省通盛工程有限公司 | Tunnel portal supporting structure in deep slippage and large bias state and construction method |
| CN117052421B (en) * | 2023-10-13 | 2024-01-09 | 湖南省通盛工程有限公司 | Tunnel portal supporting structure in deep slippage and large bias state and construction method |
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