CN219280462U - Construction structure for extending railway abutment into tunnel portal - Google Patents
Construction structure for extending railway abutment into tunnel portal Download PDFInfo
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- CN219280462U CN219280462U CN202320570531.9U CN202320570531U CN219280462U CN 219280462 U CN219280462 U CN 219280462U CN 202320570531 U CN202320570531 U CN 202320570531U CN 219280462 U CN219280462 U CN 219280462U
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Abstract
The utility model discloses a construction structure for a railway abutment to extend into a tunnel portal, which solves the problems of structural space conflict and construction difficulty of the two caused by the fact that the abutment extends into the tunnel portal at the bridge tunnel connection position of a railway line on a steep slope section. The utility model can solve the problem of structural space conflict after the abutment stretches into the tunnel portal, and provides a construction method for constructing the structure, which is a novel treatment mode and is also suitable for cross interference conditions of bridges and tunnels such as rail transit, highways, municipal roads and the like.
Description
Technical Field
The utility model relates to railway engineering, in particular to a construction structure of a railway abutment extending into a tunnel portal.
Background
With the rapid development of economic construction in China, traffic is certainly the most important infrastructure for regional economy development. The western region of China has mountain area characteristics, mountain canyons and extremely large terrain variation, and due to the large terrain variation, the situation that a large number of bridges and tunnels are connected and crossed is unavoidable, and new requirements are put forward for design and construction. The conventional mountain bridge-tunnel connection design is mainly based on a bridge abutment tail-connection tunnel portal, and the construction is relatively less in mutual interference, but the ideal bridge-tunnel connection mode cannot be realized when limited by steep slope topography in actual engineering, and the bridge abutment always directly stretches into the tunnel portal in a dangerous mountain area, so that the original topography of the tunnel portal is damaged by the construction of the bridge abutment by the conventional construction method, and the environment protection is not facilitated. The method is characterized by deep foundation pits, large excavation backfill amount, large protection amount, difficult protection, easy instability of the excavated side slope, large construction risk, long construction period and high engineering cost.
Disclosure of Invention
The utility model provides a construction structure for a railway abutment to extend into a tunnel portal, which can effectively reduce the size of a foundation pit, ensure the arrangement stability of an excavation surface, reduce construction risks, reduce the cross interference of abutment construction on the tunnel portal, save investment, reduce the collapse risk of peripheral side slopes, improve the construction safety and reduce the damage to the peripheral environment, and is a novel treatment mode.
In order to solve the problems, the utility model is realized by adopting the following technical scheme: the utility model provides a construction structures that railway abutment stretched into tunnel portal, includes bridge beam body, abutment cushion cap, abutment pile foundation, tunnel portal side direction pre-reinforcement stake, tunnel bright and dark boundary pre-reinforcement stake, counter-background safeguard measure, tunnel portal open cut tunnel, tunnel body, tunnel escape canal and open cut tunnel basis, abutment body is connected to bridge beam body, abutment body includes abutment cap, back wall and filler stone, abutment body connects abutment cushion cap, abutment cushion cap directly sets up on the abutment pile foundation, abutment cushion cap and tunnel portal open cut tunnel are connected and are formed closed system, and whole system is protected by tunnel portal side direction pre-reinforcement stake and tunnel bright and dark boundary pre-reinforcement stake, and tunnel portal open cut tunnel body is connected to the tunnel body, and the tunnel body is provided with the tunnel escape canal.
Preferably, the bridge abutment pile foundations are arranged in double rows in the forward direction.
Preferably, the abutment bearing platform is consistent with the open cut tunnel foundation in height.
Preferably, the tunnel portal lateral pre-reinforcing pile and the tunnel bright-dark boundary pre-reinforcing pile adopt hole digging piles, and the abutment pile foundation adopts hole drilling piles.
Preferably, the bottom of the open cut tunnel foundation is isolated from the bridge abutment bearing platform by two layers of felt.
Preferably, the tunnel body is provided with a bench back protection measure, and the bench back protection measure comprises an anchor spraying and soil nailing wall protection or a hole digging pile protection.
Preferably, when the abutment pile foundation and the tunnel shaft are constructed, a tunnel light-dark boundary pre-reinforcing pile and a tunnel portal lateral pre-reinforcing pile in front of the abutment are firstly constructed at one side with a high side slope, then an edge protection excavation construction platform is dug above the abutment top, the construction platform is as high as the bottom of the tunnel shaft, then the tunnel shaft is constructed, after a distance is reserved between the abutment pile foundation and the tunnel shaft, an abutment pile foundation is constructed on the platform, after the abutment pile foundation construction is completed and the tunnel shaft construction is not less than 10 meters, an abutment pile cap is excavated, the tunnel shaft hole is protected by adopting abutment back protection measures while excavation, then the abutment pile cap and the abutment shaft are constructed, foundation pit backfilling is carried out according to design, and a gap between the abutment back and the tunnel shaft hole is backfilled by concrete.
The construction structure for extending the railway abutment into the tunnel portal has the following advantages:
(1) The problem that the bridge abutment stretches into the tunnel portal to cause the conflict of the structural space of the bridge abutment and the tunnel portal can be effectively solved.
(2) The problem of mutual interference in abutment construction and tunnel portal construction is effectively solved.
(3) In the early stage, by adopting measures such as pre-reinforcing piles, the excavation backfill amount of railway bridge abutment and tunnel foundation is greatly reduced, the protection engineering is reduced, and the engineering implementation is safer and more reliable.
(4) The construction period is shortened, the engineering cost is saved, the method is economical and reasonable, and the technology is innovative.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a vertical view of a railway abutment and tunnel structure of the present utility model;
FIG. 2 is a plan of the railway abutment and tunnel arrangement of the present utility model;
FIG. 3 is a front elevational view of the railway abutment of the present utility model;
FIG. 4 is a front face of a railway abutment tail according to the present utility model;
in the figure: the bridge comprises a 1-bridge body, a 2-abutment body, a 3-abutment bearing platform, a 4-abutment pile foundation, a 5-tunnel portal lateral pre-reinforcing pile, a 6-tunnel bright-dark boundary pre-reinforcing pile, 7-abutment back protection measures, an 8-tunnel portal open cut tunnel, a 9-tunnel body, a 10-tunnel drainage ditch and an 11-open cut tunnel foundation.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
As shown in figures 1-4, the construction structure for the railway abutment extending into the tunnel portal comprises a bridge girder body 1, an abutment body 2, an abutment bearing platform 3, an abutment pile foundation 4, a tunnel portal lateral pre-reinforcing pile 5, a tunnel bright-dark boundary pre-reinforcing pile 6, an abutment back protection measure 7, a tunnel portal open cut tunnel 8, a tunnel body 9, a tunnel drainage ditch 10 and an open cut tunnel foundation 11.
The bridge abutment body 2 comprises an abutment cap, a back wall and a filler stone, the length S4 of the bridge abutment body 2 is determined according to the height difference between the tunnel drainage ditch 10 and the tunnel portal foundation according to the drainage slope rate, the width S1 of the back wall of the bridge abutment is as wide as the bridge girder body 1, the height h2 of the back wall is determined by the height h of the bridge girder and the heights of the support, the filler stone and the abutment cap, and the bridge abutment supports the bridge girder body 1 through the support.
The abutment bearing platform 3 is directly arranged on the abutment pile foundation 4, the width S2 of the abutment bearing platform 3 is determined by the requirement of the space between the foundations of the tunnel portal, the length S3 of the abutment bearing platform is determined by the arrangement of the pile foundations, and the thickness of the abutment bearing platform is 2 times as large as the diameter of the abutment pile foundation 4. The bridge abutment pile foundations 4 are arranged in double rows along the bridge direction, the transverse bridge direction row number is determined according to S2 and the pile spacing, and the pile diameter and the pile length h4 are determined according to stress calculation. The materials are reinforced concrete.
The bridge abutment bearing platform 3 and the open cut tunnel foundation 11 are consistent in height, a closed system is formed with the open cut tunnel 8 of the whole section of tunnel opening, and the whole system is protected by the tunnel portal lateral pre-reinforcing piles 5 and the tunnel bright-dark boundary pre-reinforcing piles 6, so that the stability of the whole system is guaranteed.
When the abutment pile foundation 4 and the tunnel shaft 9 are constructed, the pre-reinforced pile 6 of the light-dark boundary of the tunnel and the pre-reinforced pile 5 of the tunnel portal in front of the abutment are firstly constructed on one side or two sides of the side slope, then the abutment top is dug with the edge to protect the excavation construction platform at the opening of the tunnel shaft 9, and the construction platform is as high as the bottom of the tunnel shaft 9. And then constructing a tunnel body 9, and constructing an abutment pile foundation 4 on the platform after entering the tunnel for a certain distance. After the abutment pile foundation 4 is constructed and the tunnel hole body 9 is constructed to be not less than 10 meters, excavating an abutment bearing platform 3 foundation pit, and adopting the abutment protection measure 7 to protect the hole opening of the tunnel hole body 9 while excavating, wherein the abutment protection measure 7 can adopt the anchor spraying and soil nailing wall protection or the hole digging pile protection according to the bottom layer condition. And then constructing the abutment bearing platform 3 and the abutment body 2, and backfilling the foundation pit according to the design, wherein the gap between the abutment back and the opening of the tunnel body 9 is backfilled with concrete.
The tunnel portal lateral pre-reinforcing pile 5 and the tunnel light-dark boundary pre-reinforcing pile 6 can be hole digging piles, and the abutment pile foundation 4 is a hole drilling pile.
The bottom of the open cut tunnel foundation 11 is equal in height with the bottom of the abutment bearing platform 3, the foundation pits are excavated and then constructed together, but 2 layers of felt are adopted between the foundation pits and the foundation pits to isolate the foundation pits, so that the foundation pits are stressed clearly and do not interfere with each other.
The main construction steps and the method of the utility model are as follows:
1. firstly, constructing to complete protection measures of a tunnel top plane, cleaning an unstable slope, constructing a tunnel drainage ditch 10, a drainage system and the like.
2. The construction tunnel portal lateral pre-reinforcement pile 5 and the tunnel bright-dark boundary pre-reinforcement pile 6.
3. And excavating a hole construction platform according to the principles of 'excavating layer by layer and protecting along with excavating', wherein the excavation height of each layer is not more than 2m.
4. And constructing a tunnel body 9, and constructing the abutment pile foundation 4 after entering the tunnel for a certain distance.
5. After the tunnel body 9 is constructed more than 10 meters, excavating a foundation pit of the abutment bearing platform 3, and adopting the abutment protection measures 7 to protect while excavating. The remainder of the tunnel shaft 9 may be constructed simultaneously.
6. A construction bridge abutment cap 3 and an open cut tunnel foundation 11.
7. And constructing the abutment body 2.
8. And after the strength of the abutment body 2 meets the requirement, backfilling the foundation pit between the abutment body 2 and the tunnel hole body 9 with concrete.
9. And constructing a tunnel portal open cut tunnel 8.
10. And backfilling the foundation pit at the outer side according to the design requirement.
11. And erecting a bridge girder body 1.
12. And constructing other auxiliary structures to finish the construction.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (7)
1. A construction structure that railway abutment stretches into tunnel portal which characterized in that: including bridge beam body (1), abutment body (2), abutment cap (3), abutment pile foundation (4), tunnel portal side direction pre-reinforcement stake (5), tunnel bright and dark boundary pre-reinforcement stake (6), platform back safeguard (7), tunnel portal open cut tunnel (8), tunnel portal body (9), tunnel escape canal (10) and open cut tunnel basis (11), abutment body (2) are connected in bridge beam body (1), abutment cap (3) are connected in abutment body (2) including abutment cap, back wall and filler stone, abutment cap (3) are connected in abutment body (2), abutment cap (3) directly set up on abutment pile foundation (4), abutment cap (3) are connected with tunnel portal open cut tunnel (8) and are formed closed system, and whole system is protected by tunnel portal side direction pre-reinforcement stake (5) and tunnel portal open cut tunnel (8) pre-reinforcement stake (6), and tunnel portal open cut tunnel body (9) are provided with tunnel escape canal (10).
2. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: the abutment pile foundation (4) is arranged in double rows along the bridge direction.
3. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: the bridge abutment platform (3) is consistent with the open cut tunnel foundation (11) in height.
4. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: the lateral pre-reinforcing pile (5) of the tunnel portal and the pre-reinforcing pile (6) of the tunnel bright-dark boundary adopt hole digging piles, and the bridge abutment pile foundation (4) adopts hole drilling piles.
5. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: and two layers of felt are adopted to isolate the bottom of the open cut tunnel foundation (11) from the abutment bearing platform (3).
6. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: the tunnel portal is characterized in that a bench back protection measure (7) is arranged on the tunnel portal body (9), and the bench back protection measure (7) comprises an anchor spraying and soil nailing wall protection or a hole digging pile protection.
7. The construction structure for extending a railway abutment into a tunnel portal according to claim 1, wherein: during construction of abutment pile foundation (4) and tunnel shaft (9), firstly construct tunnel bright-dark boundary pre-reinforcement stake (6) and pre-abutment tunnel portal side direction pre-reinforcement stake (5) in one side of limit slope, then at tunnel shaft (9) entrance to a cave, the abutment bench (2) is dug the limit with the top and is protected excavation construction platform, construction platform is co-altitude with tunnel shaft (9) bottom, then construction tunnel shaft (9), after entering a section of distance, construction abutment pile foundation (4) on the platform, abutment pile foundation (4) construction is accomplished and tunnel shaft (9) construction is not less than 10 meters after, excavation abutment cushion cap (3) foundation pit, adopt stage back safeguard measure (7) to protect tunnel shaft (9) entrance to a cave simultaneously, then carry out construction of abutment cushion cap (3) and abutment bench (2), and backfill the gap between stage back and tunnel shaft (9) entrance to a cave adopts concrete backfill according to the design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320570531.9U CN219280462U (en) | 2023-03-22 | 2023-03-22 | Construction structure for extending railway abutment into tunnel portal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320570531.9U CN219280462U (en) | 2023-03-22 | 2023-03-22 | Construction structure for extending railway abutment into tunnel portal |
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| Publication Number | Publication Date |
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| CN219280462U true CN219280462U (en) | 2023-06-30 |
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| CN202320570531.9U Active CN219280462U (en) | 2023-03-22 | 2023-03-22 | Construction structure for extending railway abutment into tunnel portal |
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