CN213836265U - Reinforced foundation of tunnel portal and bridge-tunnel butt joint structure - Google Patents
Reinforced foundation of tunnel portal and bridge-tunnel butt joint structure Download PDFInfo
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- CN213836265U CN213836265U CN202022249733.2U CN202022249733U CN213836265U CN 213836265 U CN213836265 U CN 213836265U CN 202022249733 U CN202022249733 U CN 202022249733U CN 213836265 U CN213836265 U CN 213836265U
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Abstract
The utility model discloses a reinforced foundation and bridge and tunnel butt-joint structure of tunnel entrance to a cave, reinforced foundation of tunnel entrance to a cave includes: pile foundation, joist, shear bar and net spout concrete, wherein, the pile foundation is a plurality of, and the interval sets up, the joist connect in the top of pile foundation will the pile foundation links into whole, the one end of shear bar set up in the joist for connect joist and tunnel portal or open cut tunnel, net spout concrete and spout near on abutment excavation side in the pile foundation. This reinforced foundation and bridge tunnel butt-joint structural of tunnel entrance to a cave, it is rational in infrastructure, promoted wholeness, the stability of tunnel entrance to a cave structure, improved the reliability and the security of abutment foundation ditch excavation to can effectively control bridge tunnel junction post-construction settlement uneven problem.
Description
Technical Field
The utility model belongs to the technical field of bridge tunnel interface engineering is used, a reinforced foundation and bridge tunnel butt-joint structural of tunnel entrance to a cave is provided very much.
Background
With the continuous development and progress of high-speed railways and highways in China, the proportion of bridges and tunnels in engineering construction is gradually improved, bridge-tunnel connection engineering is rare, and bridge-tunnel butt joint is a common form of bridge-tunnel combination. Bridge and tunnel butt joint is that bridge abutment and tunnel entrance to a cave hug closely, and tunnel entrance to a cave pile number coincidence is in bridge abutment pile number, and bridge and tunnel structure passes through the movement joint and separates, and bridge and tunnel design, construction restrict each other, influence each other. Based on the characteristics of bridge-tunnel butt joint, the design and construction of a bridge-tunnel butt joint section are complex, the construction difficulty is high, the load change and the stress redistribution can be caused to surrounding rocks around a cave entrance in the bridge abutment excavation process, so that the stability of the surrounding rocks is reduced, and the engineering safety problem is increased; the tunnel portal or open cut tunnel structure, especially the end wall type portal, has high requirements on the bearing capacity, stability and deformation of the base. In the implementation of bridge-tunnel butt-joint engineering, besides certain interference factors exist between the bridges and the tunnels, the bridge-tunnel butt-joint engineering is also limited by site and geographical factors, so that more reasonable tunnels, bridges and supporting structures are needed. In addition, because of the deformation joint between the bridge and the tunnel, after the bridge and the tunnel are subjected to the action of load in the later operation process, if the deformation of the abutment and the tunnel is not consistent seriously, the driving smoothness and the safety are poor, and certain potential safety hazards exist.
Therefore, a novel reinforced foundation structure for a bridge-tunnel butt-joint tunnel portal is proposed, which becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a reinforced foundation and bridge tunnel butt joint structure of tunnel entrance to solve in traditional construction tunnel entrance to a cave section excavation big, the rock mass destroys drawback big, that the disturbance is big, the wholeness of tunnel entrance to a cave structure, poor stability, reliability and the security of abutment foundation ditch excavation are poor, bridge tunnel junction settlement inequality after-construction can not obtain effective control scheduling problem.
The utility model discloses an aspect provides a reinforcement basis of tunnel entrance to a cave, include: pile foundation, joist, shear bar and net spout concrete, wherein, the pile foundation is a plurality of, and the interval sets up, the joist connect in the top of pile foundation will the pile foundation links into whole, the one end of shear bar set up in the joist for connect joist and tunnel portal or open cut tunnel, net spout concrete and spout near on abutment excavation side in the pile foundation.
Preferably, the pile foundation is a cast-in-situ bored pile or a cast-in-situ dug pile.
Further preferably, the top surface of the joist is fitted with a tunnel portal or open cut tunnel.
Preferably, the pile foundation is embedded into the joist to realize connection or the pile foundation is connected with the joist through a pile top main rib.
Further preferably, the shearing ribs are arranged in a staggered manner in a plum blossom shape.
Further preferably, the net sprayed concrete comprises C25 sprayed concrete and a reinforcing steel bar net, the thickness of the C25 sprayed concrete is 10-15 cm, the grid spacing of the reinforcing steel bar net is 25cm multiplied by 25cm, and the diameter of the reinforcing steel bar is 8 mm.
The utility model also provides a bridge tunnel butt-joint structural, include: tunnel portal or open cut tunnel, abutment cushion cap, abutment and the reinforcement basis of foretell tunnel portal, wherein, the reinforcement basis of tunnel portal includes pile foundation, joist, shear bar and net shotcrete, wherein, the pile foundation is a plurality of, and the interval sets up, the joist connect in the top of pile foundation will the pile foundation links into whole, tunnel portal or open cut tunnel pass through the shear bar with the joist is connected, net shotcrete sprays the abutment excavation side that closes on in the pile foundation, abutment cushion cap and abutment are located one side of the reinforcement basis of tunnel portal, just the abutment cushion cap set up in under the abutment.
Preferably, the pile foundation is embedded below the bottom of the abutment cap.
Preferably, the shear bar is a steel bar with the diameter of 20-25mm, and the depth of the shear bar embedded into the tunnel portal or open cut tunnel is more than 50 cm.
Preferably, a deformation joint with the width of 2cm is reserved between the joist and the abutment.
The utility model provides a reinforced foundation of tunnel portal, which takes into account the functions of tunnel portal or open cut tunnel foundation and abutment foundation pit excavation protecting pile, ensures the integrity and stability of tunnel portal structure, and effectively controls the settlement deformation of tunnel portal or open cut tunnel; the effective combination of pile foundation and net shotcrete has solved the tunnel portal section excavation behind the platform big, the rock mass destroys greatly, the big drawback of disturbance, has reduced the risk that slides and collapses of rock mass in the work progress, and engineering safety hidden danger reduces. The reinforced foundation of the tunnel portal has the characteristic of combining a permanent foundation with protection engineering, and has a good control effect on uneven bridge and tunnel settlement in the post-construction operation stage.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments:
fig. 1 is a front view of a bridge-tunnel docking structure provided by the present invention;
fig. 2 is a side view of a bridge-tunnel docking structure provided by the present invention;
the method comprises the following steps of 1-pile foundation, 2-joist, 3-shear bar, 4-net-sprayed concrete, 5-tunnel portal or open cut tunnel, 6-abutment cushion cap, 7-abutment and 8-deformation joint.
Detailed Description
The invention will be further explained below with reference to specific embodiments, without limiting the invention.
As shown in fig. 1 and fig. 2, the utility model provides a reinforced foundation and bridge and tunnel butt-joint structural of tunnel entrance to a cave, wherein, reinforced foundation of tunnel entrance to a cave, include: pile foundation 1, joist 2, shear bar 3 and net spout concrete 4, wherein, pile foundation 1 is a plurality of, and the interval sets up, joist 2 connect in pile foundation 1's top will pile foundation 1 links into whole, the one end of shear bar 3 set up in be used for connecting joist 2 and tunnel portal or open cut tunnel 5 in joist 2, net spouts concrete 4 and sprays in the abutment excavation side that closes on of pile foundation 1.
The reinforced foundation of the tunnel portal takes the functions of a tunnel portal or open cut tunnel foundation and a bridge foundation pit excavation protective pile into consideration, ensures the integrity and stability of the tunnel portal structure, and effectively controls the settlement deformation of the tunnel portal or open cut tunnel; the effective combination of pile foundation and net shotcrete has solved the tunnel portal section excavation behind the platform big, the rock mass destroys greatly, the big drawback of disturbance, has reduced the risk that slides and collapses of rock mass in the work progress, and engineering safety hidden danger reduces. The reinforced foundation of the tunnel portal has the characteristic of combining a permanent foundation with protection engineering, and has a good control effect on uneven bridge and tunnel settlement in the post-construction operation stage.
As the improvement of the technical scheme, the pile foundation 1 is a cast-in-situ bored pile or a cast-in-situ dug pile, and preferably, the pile diameter of the pile foundation is more than 1.0 m.
As an improvement of the technical scheme, the top surface of the joist 2 is matched with a tunnel portal or an open cut tunnel 5, and preferably, the thickness of the joist is more than 100 cm.
As the improvement of the technical scheme, the connection mode of the pile foundation and the joist has two types: the pile foundation 1 is embedded into the joist 2 to realize connection or the pile foundation 1 is connected with the joist 2 through a pile top main rib.
As the improvement of the technical scheme, the shearing ribs are arranged in a staggered manner in a plum blossom shape.
As an improvement of the technical scheme, the net sprayed concrete 4 comprises C25 sprayed concrete and a reinforcing steel bar net, the thickness of the C25 sprayed concrete is 10-15 cm, the grid spacing of the reinforcing steel bar net is 25cm multiplied by 25cm, and the diameter of the reinforcing steel bar is 8 mm.
As shown in fig. 1 and fig. 2, the utility model also provides a bridge and tunnel butt-joint structure, include: tunnel portal or open cut tunnel 5, abutment cushion cap 6, abutment 7 and the reinforcement basis of above-mentioned tunnel portal, wherein, the reinforcement basis of tunnel portal includes pile foundation 1, joist 2, shear bar 3 and net spout concrete 4, wherein, pile foundation 1 is a plurality of, and the interval sets up, joist 2 connect in pile foundation 1's top will pile foundation 1 links into whole, tunnel portal or open cut tunnel 5 through shear bar 3 with joist 2 is connected, net spout concrete 4 and spray in the abutment excavation side that closes on of pile foundation 1, abutment cushion cap 6 and abutment 7 are located one side of the reinforcement basis of tunnel portal, just abutment cushion cap 6 set up in under the abutment.
The construction sequence of the bridge-tunnel butt-joint structure is as follows:
the method comprises the following steps: excavating earth and stones at a tunnel portal or open cut tunnel section to a substrate;
step two: constructing a pile foundation and a joist at the butt joint of the bridge and the tunnel, and embedding shear ribs when constructing the joist;
step three: excavating bridge bearing platform earthwork and timely applying construction net spraying concrete;
step four: constructing a bridge foundation, a bridge abutment and a bridge abutment;
step five: and constructing a tunnel portal or open cut tunnel.
As the improvement of the technical scheme, the pile foundation 1 is embedded below the bottom of the abutment platform 6, preferably below 4.0m, and meets the requirements of bearing capacity and stability.
As an improvement of the technical scheme, the shear bar 3 is a steel bar with the diameter of 20-25mm, and the depth of the shear bar embedded into the tunnel portal or open cut tunnel is more than 50 cm.
As an improvement of the technical scheme, a deformation joint 8 with the width of 2cm is reserved between the joist 2 and the abutment 7.
The embodiments of the present invention are written in a progressive manner, emphasizing the differences of the various embodiments, and similar parts can be referred to each other.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. The reinforcement basis of tunnel entrance to a cave, its characterized in that includes: pile foundation (1), joist (2), shear bar (3) and net spout concrete (4), wherein, pile foundation (1) is a plurality of, and the interval sets up, joist (2) connect in the top of pile foundation (1), will pile foundation (1) links into whole, the one end of shear bar (3) set up in joist (2) for connect joist (2) and tunnel portal or open cut tunnel (5), net spouts concrete (4) and sprays in the abutment excavation side that closes on of pile foundation (1).
2. The reinforced foundation for a tunnel portal of claim 1, wherein: the pile foundation (1) is a cast-in-situ bored pile or a cast-in-situ dug pile.
3. The reinforced foundation for a tunnel portal of claim 1, wherein: the top surface of the joist (2) is matched with a tunnel portal or an open cut tunnel (5).
4. The reinforced foundation for a tunnel portal of claim 1, wherein: the pile foundation (1) is embedded into the joist (2) to realize connection or the pile foundation (1) is connected with the joist (2) through a pile top main rib.
5. The reinforced foundation for a tunnel portal of claim 1, wherein: the shearing ribs (3) are arranged in a staggered manner in a plum blossom shape.
6. The reinforced foundation for a tunnel portal of claim 1, wherein: the net sprayed concrete (4) comprises C25 sprayed concrete and a reinforcing steel bar net, the thickness of the C25 sprayed concrete is 10-15 cm, the grid spacing of the reinforcing steel bar net is 25cm multiplied by 25cm, and the diameter of the reinforcing steel bar is 8 mm.
7. Bridge tunnel butt-joint structural, its characterized in that includes: tunnel portal or open cut tunnel (5), abutment cap (6), abutment (7) and the reinforcement foundation of a tunnel portal according to one of claims 1 to 6, wherein the reinforced foundation of the tunnel portal comprises a pile foundation (1), a joist (2), shear bars (3) and net-sprayed concrete (4), wherein the pile foundations (1) are arranged at intervals, the joists (2) are connected above the pile foundations (1) to connect the pile foundations (1) into a whole, the tunnel portal or open cut tunnel (5) is connected with the joist (2) through a shear rib (3), the net spraying concrete (4) is sprayed on the side of the pile foundation (1) close to the bridge abutment excavation side, the abutment bearing platform (6) and the abutment (7) are positioned on one side of the reinforced foundation of the tunnel portal, and the abutment bearing platform (6) is arranged right below the abutment (7).
8. A bridge and tunnel docking structure according to claim 7, wherein: the pile foundation (1) is embedded below the bottom of the abutment bearing platform (6).
9. A bridge and tunnel docking structure according to claim 7, wherein: the shear rib (3) is a steel bar with the diameter of 20-25mm, and the depth of the shear rib embedded into the tunnel portal or open cut tunnel is more than 50 cm.
10. A bridge and tunnel docking structure according to claim 7, wherein: and a deformation joint (8) with the width of 2cm is reserved between the joist (2) and the abutment (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022249733.2U CN213836265U (en) | 2020-10-12 | 2020-10-12 | Reinforced foundation of tunnel portal and bridge-tunnel butt joint structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022249733.2U CN213836265U (en) | 2020-10-12 | 2020-10-12 | Reinforced foundation of tunnel portal and bridge-tunnel butt joint structure |
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| Publication Number | Publication Date |
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| CN213836265U true CN213836265U (en) | 2021-07-30 |
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| CN202022249733.2U Active CN213836265U (en) | 2020-10-12 | 2020-10-12 | Reinforced foundation of tunnel portal and bridge-tunnel butt joint structure |
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