Roadbed anti-sedimentation pre-reinforcing structure suitable for tunnel underneath pass construction

Abstract

The utility model discloses a roadbed anti-sedimentation pre-reinforcing structure suitable for tunnel underneath pass construction, which belongs to the field of tunnel underneath pass construction and comprises a pre-reinforcing structure arranged at the intersection of a roadbed and a tunnel, and the pre-reinforcing structure comprises concrete guide beams arranged at slope toe positions on two sides of the roadbed. Vertical anti-pulling stand columns are fixedly arranged at the front end and the rear end of the concrete guide beam, a plurality of oblique grouting pipe sheds are obliquely arranged on the middle section of the concrete guide beam, and the oblique grouting pipe sheds on the two sides are arranged in a staggered mode. The vertical anti-pulling stand columns are used for fixing the concrete guide beams, the concrete guide beams are used for guiding and end locking of the oblique grouting pipe sheds, then the oblique grouting pipe sheds are used for effective pre-reinforcement treatment of the roadbed, and adverse disturbance to the road surface in the roadbed underneath passing process of the structure can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of tunnel underpass construction, specifically relates to a roadbed anti -settlement pre -reinforcement structure suitable for tunnel underpass construction. BACKGROUND

[0002] In the process of constructing underground structures such as tunnels, there will be more or less a position conflict with existing structures, at which time the overpass or underpass method needs to be used for processing, and the pipeline underpass processing scheme accounts for a large proportion. However, the tunnel underpass process will inevitably cause construction interference to the existing structures, and if not controlled, it may affect the structural stability of the existing structures, which is a construction problem that needs special attention. When the underground pipeline underpasses the deformation-sensitive structure such as the roadbed, the related requirements for settlement deformation are particularly strict, and how to control the roadbed settlement deformation has become the most core problem of the underpass scheme.

[0003] At present, the most conventional measure is to try to enlarge the net distance between the tunnel and the roadbed, so as to reduce the adverse effects of tunnel construction on the stability of the roadbed. However, if the tunnel line position is limited and there is no possibility to separate the distance between the tunnel and the roadbed, reliable roadbed pre-reinforcement measures need to be taken to deal with the construction disturbance problem by improving the stability of the roadbed itself. For example, the utility model discloses a supporting structure for preventing settlement control of shield underpass buildings, which comprises a reinforcing support arranged along the axial direction of the shield tunnel, the reinforcing support is located below the two ends of the underpass building, an injection pipe is obliquely arranged on the side of the building and inserted into the lower part of the building, a reinforcing layer is formed by pouring the lower part of the building through the injection pipe, and the shield tunnel passes through the reinforcing supports at both ends; a plurality of horizontal pipe sheds are longitudinally arranged above the arch part of the shield tunnel, the horizontal pipe sheds are arranged vertically to the reinforcing supports, a pipe core is arranged in the horizontal pipe shed, and rotating jet piles are arranged around the pipe core and are mutually engaged. The horizontal pipe shed and the reinforcing layer improve the compressive strength of the arch part of the stratum, the reinforcing support is used as the fulcrum of the tunnel, and the reinforcing layer and the horizontal pipe shed form an anti-settlement structure to ensure the deformation and stress requirements of the soil layer during the shield underpass building construction and improve the safety and stability during the tunnel underpass building construction. UTILITY MODEL CONTENTS

[0004] In order to solve the above problems, the utility model aims at providing a roadbed anti-settlement pre-reinforcement structure suitable for tunnel underpass construction.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: A kind of embankment anti-settling pre-reinforcement structure suitable for tunnel underpass construction, including embankment and the tunnel passing through from the lower part of embankment, a pair of concrete guide beam is horizontally arranged at the intersection of embankment and tunnel, vertical uplift column is inserted in the vertical direction of concrete guide beam, and several oblique grouting pipe sheds that are inclined to the lower part of embankment are further connected on concrete guide beam, and the oblique grouting pipe shed of the two sides of embankment is staggered arrangement.

[0006] Further, the concrete guide beam is a reinforced concrete structure, and is arranged at the position of the slope foot of the two sides of the embankment.

[0007] Further, the two ends of the concrete guide beam are vertically provided with a plurality of vertical uplift columns, and a plurality of oblique pipe shed guide pipes are equidistantly arranged in the middle of the concrete guide beam, and the oblique pipe shed guide pipes are obliquely arranged in the concrete guide beam.

[0008] Further, the vertical uplift column is made of a grouting steel flower pipe or a large-diameter threaded steel bar.

[0009] Further, a steel cage is arranged in the oblique grouting pipe shed, and a grouting process is used, and the grouting pressure is 0.2-0.5 MPa.

[0010] Further, the vertical uplift column is welded with the steel bars inside the concrete guide beam, and is fixed into the underlying soil layer of the embankment and the tunnel.

[0011] Further, one end of the oblique grouting pipe shed is sleeved with the oblique pipe shed guide pipe inside the concrete guide beam, and the other end is obliquely and downwardly inserted into the intersection soil layer of the embankment and the tunnel.

[0012] Further, the plurality of oblique grouting pipe sheds connected to the two concrete guide beams are staggered with each other along the axial direction of the embankment, and are cross-lapped along the transverse direction of the embankment, and the cross-lapping length is greater than 1 m.

[0013] Further, the oblique construction angle of the oblique grouting pipe shed is determined according to the corresponding size of the embankment and the vertical distance between the tunnel and the embankment, wherein the minimum distance of the oblique grouting pipe shed from the tunnel is greater than 1 m, and the distance from the top surface of the embankment is greater than 2 m.

[0014] Further, the oblique construction angle of the oblique grouting pipe shed is 15-25°.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] (1) The utility model discloses a pre-reinforcement structure composed of a concrete guide beam, a vertical uplift column and an oblique grouting pipe shed, which is constructed below the embankment, can effectively reduce the adverse effects of tunnel underpass construction on the top embankment and pavement structure.

[0017] (2) The vertical anti-pulling column is used for fixing the concrete guide beam, the concrete guide beam is used for guiding and end locking the inclined grouting pipe shed, and the inclined grouting pipe shed is used for effectively pre-reinforcing the roadbed, the structure design is reasonable, and stress is reliable.

[0018] (3) The related structure construction of the utility model is carried out on the side of the roadbed, the road can keep normal operation in the construction process, the construction interference is small, and the construction speed is relatively fast and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the specific embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings described below are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for the ordinary skilled in the art.

[0020] Figure 1 It is the plane plan view of the roadbed anti-settlement pre-reinforcement structure in the utility model;

[0021] Figure 2 It is the side view of the roadbed anti-settlement pre-reinforcement structure in the utility model;

[0022] In the drawing, 1-tunnel; 2-roadbed; 3-concrete guide beam; 3.1-inclined pipe shed guide pipe; 4-vertical anti-pulling column; 5-inclined grouting pipe shed. DETAILED DESCRIPTION

[0023] The utility model will be further illustrated below in combination with the drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the utility model is limited to the following embodiments, and various modifications, replacements and changes made according to the ordinary technical knowledge and conventional means in the art without departing from the above technical idea of the utility model are included in the scope of the utility model.

[0024] REFERENCE Figure 1 It is a kind of roadbed anti-settlement pre-reinforcement structure suitable for tunnel under construction, to provide a kind of new technical scheme of construction convenient, reliable stress for roadbed pre-reinforcement construction.

[0025] The subgrade anti-settling pre-reinforcing structure is as follows: a tunnel 1 passes through under a subgrade 2, a pair of concrete guide beams 3 are horizontally arranged at the intersection of the subgrade 2 and the tunnel 1, vertical uplift resisting columns 4 are vertically inserted into the concrete guide beams 3, a plurality of inclined grouting pipe sheds 5 are connected to the concrete guide beams 3 and are inclined to the lower part of the subgrade 2, and the inclined grouting pipe sheds 5 on both sides of the subgrade 2 are staggered. A plurality of vertical uplift resisting columns 4 are vertically arranged at the both ends of the concrete guide beams 3, a plurality of inclined pipe shed guide pipes 3.1 are equidistantly arranged in the middle of the concrete guide beams 3, and the inclined pipe shed guide pipes 3.1 are obliquely arranged in the concrete guide beams 3. The vertical uplift resisting columns 4 are welded with the steel bars in the concrete guide beams 3 and are fixed into the underlying soil layer of the subgrade 2 and the tunnel 1. One end of the inclined grouting pipe shed 5 is sleeved with the inclined pipe shed guide pipe 3.1 in the concrete guide beam 3, and the other end is obliquely and downwardly fixed into the intersection soil layer of the subgrade 2 and the tunnel 1.

[0026] The concrete guide beam 3 is closely attached to the slope surface of the subgrade 2, and the inside of the concrete guide beam 3 is provided with steel bars to improve the bending resistance. The inside of the concrete guide beam 3 is further provided with the inclined pipe shed guide pipe 3.1, which is welded and connected with the steel bars in the concrete guide beam 3 and serves as a guide positioning device for the construction of the inclined grouting pipe shed 5.

[0027] The vertical uplift resisting column 4 selectively uses a grouting steel flower pipe or a large-diameter threaded steel bar, the upper end of the vertical uplift resisting column 4 passes through the middle of the horizontal dimension of the concrete guide beam 3 and is fixedly connected with the concrete guide beam 3, and the lower end of the vertical uplift resisting column 4 is fixed into the stratum, which serves to firmly fix the concrete guide beam 3 at the subgrade slope foot position and prevent the concrete guide beam 3 from moving due to the force of the inclined grouting pipe shed 5. The vertical uplift resisting column 4 is welded and connected with the steel bars in the concrete guide beam 3.

[0028] The inclined grouting pipe shed 5 uses the inclined pipe shed guide pipe 3.1 as a guide positioning device and is constructed at the lower part of the subgrade 2, and the left and right inclined grouting pipe sheds 5 are staggered along the axial direction of the subgrade 2 and are cross-lapped along the transverse direction of the subgrade 2, and the cross-lapping length is greater than 1 m. The oblique construction angle of the inclined grouting pipe shed 5 is controlled to be between 15-25°, the minimum distance between the inclined grouting pipe shed 5 and the tunnel 1 is greater than 1 m, and the distance between the inclined grouting pipe shed 5 and the top surface of the subgrade 2 is greater than 2 m, that is, the oblique construction angle of the inclined grouting pipe shed 5 is determined according to the corresponding size of the subgrade and the vertical distance between the tunnel 1 and the subgrade 2. The grouting pressure of the inclined grouting pipe shed 5 is controlled to be between 0.2-0.5 MPa, and the observation of the top surface of the subgrade should be strengthened during the grouting process to prevent the grouting from causing the road surface to crack. A steel cage can be arranged in the pipe of the inclined grouting pipe shed 5 to increase the bending stiffness of the pipe shed.

[0029] The construction steps of the subgrade anti-settling pre-reinforcing structure are as follows:

[0030] S1, first measure and determine the intersection section of the tunnel 1 and the subgrade 2 and the vertical distance between the tunnel 1 and the subgrade 2;

[0031] S2, according to the determined tunnel 1 and the location of the roadbed 2 intersection, determine the position of the concrete guide beam 3, and then construct the vertical anti-pulling column 4 in the corresponding position;

[0032] S3, binding the steel bars of the concrete guide beam 3, welding the vertical anti-pulling column 4 with the steel bars, and constructing the inclined pipe shed guide pipe 3.1 relying on the steel bars;

[0033] S4, set the concrete guide beam 3 template, and then pour the concrete guide beam 3;

[0034] S5, after the concrete guide beam 3 forms strength, the inclined grouting pipe shed 5 is constructed by means of the inclined pipe shed guide pipe 3.1, and the grouting construction is carried out;

[0035] S6, after the slurry of the inclined grouting pipe shed 5 forms strength, the tunnel 1 is constructed again according to the relevant process.

[0036] The utility model discloses a pre-reinforced structure composed of concrete guide beam, vertical anti-pulling column and inclined grouting pipe shed is made in advance under the roadbed to be underpunched, the vertical anti-pulling column is used for fixing the concrete guide beam, the concrete guide beam is used for guiding and end locking the inclined grouting pipe shed, and then the inclined grouting pipe shed is used for effectively pre-reinforcing the roadbed, which can effectively reduce the adverse disturbance to the road surface in the process of underpunching the structure through the roadbed, and is suitable for the construction field of municipal tunnel underpunching existing road or railway.

[0037] The roadbed anti-settlement pre-reinforced structure suitable for tunnel underpunching construction provided by the utility model is introduced in detail, and the structure and working principle of the utility model are described by applying specific examples. The above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the utility model claims.

Claims

1. A subgrade anti-settlement pre-reinforcement structure suitable for tunnel underpass construction, characterized in that: The utility model provides a kind of tunnel and roadbed crossing structure, including roadbed (2) and tunnel (1) passing from below roadbed (2), a pair of concrete guide beam (3) is horizontally arranged at the intersection of roadbed (2) and tunnel (1), vertical uplift resisting column (4) is inserted in the vertical direction of concrete guide beam (3), and several oblique grouting pipe shed (5) inclined to the lower part of roadbed (2) are also connected on concrete guide beam (3), and oblique grouting pipe shed (5) on both sides of roadbed (2) is staggered arrangement.

2. The settlement-prevention pre-reinforcement structure for embankment suitable for tunnel underpass construction according to claim 1, characterized in that: The concrete guide beam (3) is a reinforced concrete structure, and is arranged at the toe position of the roadbed (2) on both sides.

3. The settlement-prevention pre-reinforcement structure for embankment suitable for tunnel underpass construction according to claim 2, characterized in that: The two ends of the concrete guide beam (3) are vertically provided with a plurality of vertical uplift resisting columns (4), and a plurality of oblique pipe shed guide pipes (3.1) are arranged at equal intervals in the middle of the concrete guide beam (3), and the oblique pipe shed guide pipes (3.1) are inclinedly arranged in the concrete guide beam (3).

4. The settlement resistant pre-reinforced structure of subgrade suitable for tunnel underpass construction according to claim 1, characterized in that: The vertical uplift resisting column (4) is a grouting steel flower pipe or a large-diameter threaded steel bar.

5. The settlement resistant pre-reinforced structure of subgrade suitable for underpass tunneling construction according to claim 1, characterized in that: The oblique grouting pipe shed (5) is provided with a steel cage, and uses a grouting process with a grouting pressure of 0.2-0.5 MPa.

6. The roadbed anti-settlement pre-reinforcement structure suitable for tunnel underpass construction according to claim 3 or 4, characterized in that: The vertical uplift resisting column (4) is welded with the steel bars inside the concrete guide beam (3) and is fixed into the underlying soil layer of the roadbed (2) and the tunnel (1).

7. The settlement-preventing pre-reinforcement structure for embankment suitable for under-crossing tunnel construction according to claim 1 or 3, characterized in that: One end of the oblique grouting pipe shed (5) is sleeved with the oblique pipe shed guide pipe (3.1) inside the concrete guide beam (3), and the other end is inclinedly and downwardly inserted into the intersection soil layer of the roadbed (2) and the tunnel (1).

8. The settlement resistant pre-reinforced structure of subgrade suitable for tunnel underpass construction according to claim 1, characterized in that: The plurality of oblique grouting pipe sheds (5) connected to the two concrete guide beams (3) are staggered with each other along the axial direction of the roadbed (2), and are cross-lapped along the cross-sectional direction of the roadbed (2), and the cross-lapping length is greater than 1 m.

9. The settlement resistant pre-reinforced structure of sub-grade suitable for underpass tunneling construction according to claim 1, characterized in that: The oblique construction angle of the oblique grouting pipe shed (5) is determined according to the corresponding size of the roadbed and the vertical distance between the tunnel (1) and the roadbed (2), wherein the minimum distance between the oblique grouting pipe shed (5) and the tunnel (1) is greater than 1 m, and the distance from the oblique grouting pipe shed (5) to the top surface of the roadbed is greater than 2 m.

10. The settlement-prevention pre-reinforcement structure for embankment suitable for under-crossing tunnel construction according to claim 7, characterized in that: The oblique construction angle of the oblique grouting pipe shed (5) is 15-25°.

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