CN213898989U

CN213898989U - Buffer structure portal suitable for limited conditions of bridge-tunnel connection site

Info

Publication number: CN213898989U
Application number: CN202023033737.3U
Authority: CN
Inventors: 李健; 周军海; 曹勇; 唐晓铭; 赵旭伟; 冯宝才; 赵志国; 周萌; 吴超俊
Original assignee: China Railway Shanghai Design Institute Group Co Ltd
Current assignee: China Railway Shanghai Design Institute Group Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-08-06
Anticipated expiration: 2030-12-16

Abstract

The utility model belongs to the technical field of bridge and tunnel engineering technique and specifically relates to a buffer structure entrance to a cave suitable for continuous place restricted condition of bridge tunnel, its characterized in that: this buffer structure entrance to a cave includes open cut tunnel lining cutting, headwall, barricade and friction pile, wherein the open cut tunnel lining cutting divide into abutment section lining cutting of entering the cave and general section lining cutting, the abutment section lining cutting of entering the cave contains the excavation abutment, the headwall the barricade with friction pile combination constitutes supporting construction and sets up general section lining cutting's periphery. The utility model has the advantages that: the bridge-tunnel connection is met, the aerodynamic effect can be buffered, and the advantages of small brushing amount and small influence on the environment are achieved; the structural stability is strong, the brushing amount is effectively reduced, the length of the tunnel portal is shortened, and the tunnel portal is particularly suitable for the situation that the hillside is steep, and the places such as rivers, brooks, roads and the like are limited at the tunnel portal.

Description

Buffer structure portal suitable for limited conditions of bridge-tunnel connection site

Technical Field

The utility model belongs to the technical field of bridge and tunnel engineering technique and specifically relates to a buffer structure entrance to a cave suitable for continuous place restricted condition of bridge tunnel.

Background

In recent years, railway construction, particularly high-speed railway construction, is developed vigorously, the breadth of our country is vast, the terrain is in a trend of being high in the west and low in the east, and a plurality of engineering problems are faced by building a high-speed railway tunnel in the middle and west and crossing complex mountain areas. The restriction of a plane curve of a high-speed railway line is large, so that the situation that a plurality of bridges and tunnels are connected inevitably occurs when the high-speed railway line passes through a complex mountain area, roads such as a mountain ditch and a valley are dense, roads such as a county road and a rural road are staggered, and the construction condition of a tunnel entrance is limited. In recent years, the environmental protection requirement is increasingly strict, engineering construction strictly controls the damage of the surrounding environment, and the strict requirement is put forward in the design of the tunnel portal: follow the principle of 'early-in and late-out' and avoid digging a big brush.

When a high-speed railway train drives into a tunnel, a series of complex aerodynamic effects are generated at the tunnel opening. The generated aerodynamic effect not only has a crucial influence on driving safety and riding comfort, but also endangers the safety of facilities in the tunnel.

In summary, under the conditions of complex terrain and limited site conditions in mountainous areas, a tunnel structure which can meet bridge-tunnel connection, can buffer aerodynamic effect, has small prescription amount and small influence on environment needs to be designed urgently.

Disclosure of Invention

The utility model aims at providing a buffer structure door suitable for the continuous place restricted condition in bridge tunnel according to above-mentioned prior art, through setting up the door structure in a hole, when satisfying the bridge tunnel and linking to each other, can cushion the aerodynamic effect again to the brush square measure is little, little to the environmental impact.

The utility model discloses the purpose is realized accomplishing by following technical scheme:

the utility model provides a buffer structure portal suitable for the place restricted condition that links to each other of bridge tunnel which characterized in that: this buffer structure entrance to a cave includes open cut tunnel lining cutting, headwall, barricade and friction pile, wherein the open cut tunnel lining cutting divide into abutment section lining cutting of entering the cave and general section lining cutting, the abutment section lining cutting of entering the cave contains the excavation abutment, the headwall the barricade with friction pile combination constitutes supporting construction and sets up general section lining cutting's periphery.

The headwall sets up linking position between open cut tunnel lining and the dark hole lining, the barricade is followed the longitudinal arrangement of open cut tunnel lining and with the headwall is connected, the friction pile sets up headwall bottom supports it.

And the bridge abutment entry section lining is formed by including the excavation bridge abutment by adopting a separated type enlarged section.

And a pile foundation is supported below the lining of the bridge abutment entry section.

And opening a lateral opening in the open cut tunnel lining.

The area ratio of the total area of the openings to the effective area of the open cut tunnel lining is 0.2-0.35.

The area ratio of the open cut tunnel lining effective area to the hidden tunnel lining effective area is 1.35-1.5.

The utility model has the advantages that: the bridge-tunnel connection is met, the aerodynamic effect can be buffered, and the advantages of small brushing amount and small influence on the environment are achieved; the structural stability is strong, the brushing amount is effectively reduced, the length of the tunnel portal is shortened, and the tunnel portal is particularly suitable for the situation that the hillside is steep, and the places such as rivers, brooks, roads and the like are limited at the tunnel portal.

Drawings

Fig. 1 is a schematic plan view of the present invention;

FIG. 2 is a schematic view of the longitudinal section structure of the present invention;

FIG. 3 is a schematic view of the front structure of the utility model at the opening;

fig. 4 is a schematic diagram of the front structure of the end wall of the present invention.

Detailed Description

The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

as shown in fig. 1-4, the labels 1-9 in the figures are respectively expressed as: open cut tunnel lining 1, excavation abutment 2, end wall 3, anti-slide pile 4, retaining wall 5, power open pore 6, power open pore 7, excavation pile 8 and blind hole lining 9.

Example (b): the buffer structure entrance to a cave suitable for the continuous place limited condition of bridge tunnel in this embodiment is the tunnel that is used for bridge tunnel hookup location and advances entrance to a cave department structure, and it is when satisfying that bridge tunnel links to each other, can cushion the aerodynamic effect again to brush the square volume and be convenient for the construction, avoid destroying all ring edge borders for a short time to the environmental impact.

Specifically, as shown in fig. 1 and fig. 2, the buffer structure tunnel door in the present embodiment includes an open cut tunnel lining 1, an end wall 3, a retaining wall 5, and an anti-slide pile 4, wherein a blind tunnel lining 9 is connected to a rear end of the open cut tunnel lining 1 and communicated to form a tunnel structure. The open cut tunnel lining 1 is divided into an abutment entry section lining and a general section lining along the longitudinal direction (line direction), wherein the abutment entry section lining is used as an inlet end of the open cut tunnel lining 1, and the excavation abutment 2 is wrapped in a tunnel structure by adopting a separated type enlarged section open cut tunnel lining, so that the integrity of the bridge-tunnel connecting position can be improved, and the mutual influence between bridge-tunnel structures is avoided. The separated type means that the excavation abutment 2 is inserted into a limited position of the open cut tunnel lining 1 of the tunnel structure. The general section lining is arranged between the bridge abutment entry section lining and the rear hidden tunnel lining 9.

As shown in fig. 1 or fig. 3, a dug pile 8 serving as a pile foundation is arranged below the bridge abutment cave-entering section lining, and the dug pile 8 can improve the bearing capacity of the section lining and avoid adverse effects caused by the fact that the bearing capacity of the bearing stratum foundation does not meet the structural requirements.

Referring to fig. 1, 2 and 4, the end wall 3, the anti-slide piles 4 and the retaining wall 5 are combined to form a supporting structure at the periphery of the open cut tunnel lining 1 so as to reduce the longitudinal soil pressure of the line. Specifically, the wall body of the retaining wall 5 is arranged along the longitudinal extension of the open cut tunnel lining 1, one end of the retaining wall is connected with the end wall 3 arranged at the joint position of the open cut tunnel lining 1 and the blind cut tunnel lining 9, the bottom of the end wall 3 is provided with the slide-resistant pile 4 serving as a pile foundation, and the bottom of the slide-resistant pile 4 can be supported on a bearing layer. In some embodiments, the anti-slide piles 4 may be integrally constructed with the end walls 3 to increase the strength of the supporting structure and ensure that it meets the requirement of resisting the pressure of the soil.

As shown in fig. 1, the side wall of the open cut tunnel lining 1 is respectively provided with a power opening 6 and a power opening 7, and the power opening 6 and the power opening 7 are arranged at intervals along the longitudinal direction of the open cut tunnel lining 1. The open cut tunnel lining 1 is provided with the holes and is matched with the open cut tunnel lining 1 to enlarge the section, so that the aerodynamic effect is relieved jointly, and the driving safety of the tunnel and the safety of the tunnel structure body are ensured.

In the embodiment, in specific implementation: the sizes of the dynamic open pores 6 and the dynamic open pores 7 are preferably 4m in longitudinal length and 4m in height, the area ratio of the total open pore area to the effective area of the open cut tunnel lining 1 is 0.2-0.35, and the area ratio of the effective area of the open cut tunnel lining 1 to the effective area of the blind cut tunnel lining 9 is 1.35-1.5; by such a design, the effect of alleviating the aerodynamic effect can be further ensured.

This embodiment adopts the integrated configuration of headwall 3, friction pile 4 and barricade 5 to keep out the vertical direction soil pressure of circuit, and stability is strong to effectual reduction brush square volume has shortened portal length, is particularly useful for the hillside precipitous, and there are place limited circumstances such as river brook and road in entrance to a cave department.

Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.

Claims

1. The utility model provides a buffer structure portal suitable for the place restricted condition that links to each other of bridge tunnel which characterized in that: this buffer structure entrance to a cave includes open cut tunnel lining cutting, headwall, barricade and friction pile, wherein the open cut tunnel lining cutting divide into abutment section lining cutting of entering the cave and general section lining cutting, the abutment section lining cutting of entering the cave contains the excavation abutment, the headwall the barricade with friction pile combination constitutes supporting construction and sets up general section lining cutting's periphery.

2. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 1, characterized in that: the headwall sets up linking position between open cut tunnel lining and the dark hole lining, the barricade is followed the longitudinal arrangement of open cut tunnel lining and with the headwall is connected, the friction pile sets up headwall bottom supports it.

3. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 1, characterized in that: and the bridge abutment entry section lining is formed by including the excavation bridge abutment by adopting a separated type enlarged section.

4. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 1, characterized in that: and a pile foundation is supported below the lining of the bridge abutment entry section.

5. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 1, characterized in that: and opening a lateral opening in the open cut tunnel lining.

6. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 5, characterized in that: the area ratio of the total area of the openings to the effective area of the open cut tunnel lining is 0.2-0.35.

7. The door with the buffer structure suitable for limited site connected with bridge and tunnel according to claim 1, characterized in that: the area ratio of the open cut tunnel lining effective area to the hidden tunnel lining effective area is 1.35-1.5.