Shallow-buried unsymmetrical-pressure multi-arch tunnel structure suitable for city and construction method

Abstract

The invention discloses a shallow-buried unsymmetrical-pressure multi-arch tunnel structure suitable for cities and a construction method, and relates to the technical field of tunnel structures. The shallow-buried unsymmetrical-pressure multi-arch tunnel structure comprises a reinforced concrete column, reinforced concrete bases are arranged on the two sides of the reinforced concrete column, and concrete cushion layers are arranged between the reinforced concrete column and the reinforced concrete bases on the two sides; a reinforced concrete wall is integrally formed on the tops of the reinforced concrete bases, and a corrugated steel plate is arranged between the tops of the two reinforced concrete bases. The corrugated steel plate comprises arc-shaped sections, connecting sections and vertical sections, the number of the arc-shaped sections is two, the number of the vertical sections is two, the two arc-shaped sections are distributed above the two concrete cushion layers respectively, and the arc-shaped sections are in an arch shape. According to the shallow-buried unsymmetrical-pressure multi-arch tunnel structure suitable for the city, the corrugated steel plates serve as the arch lining structure of the multi-arch tunnel, the reinforced concrete columns, the reinforced concrete bases, the concrete cushion layers, the supporting assemblies and the like are arranged, the distance between the sidelines of the left pavement and the right pavement of the tunnel is reduced to 2 m from 5 m, the number of spread lines of the roadbed section outside the tunnel is greatly reduced, and environmental protection is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel structures, and in particular to a structure and a construction method for a shallow buried biased multi-arch tunnel suitable for an urban area. Background Art

[0002] With the acceleration of urban construction, urban construction has increasingly encountered the problem of roads being controlled by road red lines and having to cross low hills. Since the land planning on both sides of the road has been determined, the road cannot be displayed in the tunnel section; secondly, environmental protection requirements are gradually increasing, and large-scale excavation can no longer meet environmental impact assessments, which increases the difficulty in the design of roads crossing low hills.

[0003] The tunnel design scheme currently used to address the above problems is a multi-arch tunnel, and the excavation schemes are open-cut (can use eight lanes in both directions), dark-cut (generally six lanes in both directions) and top-pushing (can use eight lanes in both directions), but all have certain disadvantages. When the construction site is located in an environmentally sensitive area in an urban area, the open-cut scheme will be limited; low hills are generally strongly weathered rocks, and the dark-cut scheme is risky, especially as the excavation span increases, the risk is greater; the top-pushing scheme is limited by the tunnel length and is generally suitable for sections with a tunnel length of less than 100m.

[0004] In addition, since the median dividing strip of the roadbed outside the tunnel at both ends is only 50cm, and the distance between the left and right roadbed edges of a conventional multi-arch tunnel is 5m, the roadbed outside the tunnel needs to be extended to transition the median dividing strip from 50cm to 5m. The resulting problem is that the extension of the roadbed at the tunnel entrance will increase the amount of land acquisition, and in environmentally sensitive areas, it may exceed the red line, making the plan untenable.

[0005] Therefore, it is necessary to propose a structure and construction method suitable for urban shallow buried biased double-arch tunnels to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a structure and construction method suitable for urban shallow-buried biased double-arch tunnels, so as to solve the problem that the median dividing strip of the roadbed outside the tunnel at both ends of the tunnel is only 50 cm, while the spacing between the left and right roadbed edges of the conventional double-arch tunnel is 5m, resulting in the need to extend the roadbed outside the tunnel to transition the median dividing strip from 50 cm to 5m. The resulting problem is that the extension of the roadbed at the tunnel entrance increases a large amount of land acquisition, and in environmentally sensitive areas, it may break the red line, resulting in the failure of the plan.

[0007] To achieve the above object, the present invention provides the following technical solutions: a structure suitable for an urban shallow buried biased arch tunnel, comprising a reinforced concrete column, both sides of the reinforced concrete column are provided with reinforced concrete bases, concrete cushion layers are provided between the reinforced concrete column and the reinforced concrete bases on both sides, a reinforced concrete wall is integrally formed on the top of the reinforced concrete base, and a corrugated steel plate is provided between the tops of the two reinforced concrete bases;

[0008] The corrugated steel plate includes an arc segment, a connecting segment and a vertical segment. The arc segment and the vertical segment are both provided in two numbers. The two arc segments are respectively distributed above the two concrete cushion layers. The arc segments are in an arch shape. The vertical segment is fixedly installed on the corresponding reinforced concrete base. The connecting segment is provided between the two arc segments. One end of the arc segment away from the connecting segment is connected to the corresponding vertical segment.

[0009] A support assembly for temporary support is arranged on the side of the reinforced concrete base facing away from the reinforced concrete column, and the support assembly includes a U-shaped steel sheet pile and a prestressed anchor cable.

[0010] Preferably, the concrete cushion layer is arranged in an arc shape, and the middle section of the concrete cushion layer is concave downwards.

[0011] Preferably, the U-shaped steel sheet piles are fixedly installed in the access road, the U-shaped steel sheet piles are vertically distributed, one end of the prestressed anchor cable is fixedly connected to the corresponding reinforced concrete base, and the other end of the prestressed anchor cable passes through the U-shaped steel sheet piles and is fastened to the access road wall.

[0012] Preferably, the support components are arranged in multiple groups, and the multiple groups of support components are evenly distributed along the length direction of the reinforced concrete base.

[0013] Preferably, a drainage component is provided between the connecting section and the reinforced concrete wall, and the drainage component includes a first drainage hole, a second drainage hole and a third drainage hole, the first drainage hole is opened through the connecting section, the second drainage hole is opened on the reinforced concrete wall, the third drainage hole is opened at the bottom of the side wall of the reinforced concrete wall, one end of the second drainage hole is connected to the first drainage hole, and the other end of the second drainage hole is connected to the third drainage hole.

[0014] Preferably, the drainage components are arranged in multiple groups, and the multiple groups of drainage components are evenly distributed.

[0015] Preferably, a guide frame is provided on the side of the reinforced concrete base close to the reinforced concrete column, a first drainage ditch is provided on the side of the guide frame close to the reinforced concrete column, a first drainage channel is provided on the side of the first drainage ditch close to the reinforced concrete column, the first drainage ditch cooperates with the first drainage channel, a second drainage ditch is provided on the side of the reinforced concrete column close to the reinforced concrete base, a second drainage channel is provided below the second drainage ditch, and the second drainage ditch cooperates with the second drainage channel.

[0016] Preferably, a road surface is paved between the first drainage channel and the second drainage ditch, and the road surface includes a surface layer and a base layer, and the base layer is located below the surface layer.

[0017] Preferably, the road surface is inclined, with one end of the road surface close to the first drainage channel sloping downward.

[0018] The present invention also proposes a construction method for a shallow buried biased double-arch tunnel in an urban area, comprising the above-mentioned shallow buried biased double-arch tunnel structure in an urban area, and further comprising the following steps:

[0019] S1. Excavate the construction access road along the designed U-shaped steel sheet pile plane, and then construct the U-shaped steel sheet pile;

[0020] S2. After the U-shaped steel sheet pile construction is completed, the foundation pit is excavated, and the reinforced concrete columns, reinforced concrete base and concrete cushion are constructed. After completion, the gap between the reinforced concrete base and the U-shaped steel sheet pile is backfilled with M20 mortar, and then the prestressed anchor cable is constructed;

[0021] S3. Construct reinforced concrete walls and reserve longitudinal drainage holes;

[0022] S4, assembling corrugated steel plates;

[0023] S5. Use HT low-carbon new material for backfilling.

[0024] Technical effects and advantages of the present invention:

[0025] 1. The present invention uses corrugated steel plates as the arch lining structure of the multi-arch tunnel, and sets reinforced concrete columns, reinforced concrete foundations, concrete cushions, support components, etc., reducing the distance between the left and right road surface edges of the tunnel from 5m to 2m, greatly reducing the extension of the roadbed section outside the tunnel, which will be beneficial to environmental protection;

[0026] 2. Set up reinforced concrete columns, reinforced concrete foundations and concrete cushions to form the bottom structure of the tunnel. The concrete cushion is in an arc shape, which can improve the overall stability of the multi-arch tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is applicable to the schematic diagram of the structure of an urban shallow buried biased multi-arch tunnel.

[0028] Figure 2 It is a schematic diagram of the U-shaped steel sheet pile and prestressed anchor cable structure of the present invention.

[0029] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0030] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B in the middle.

[0031] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point C in the middle.

[0032] Figure 6 It is a schematic diagram of the reinforced concrete column and reinforced concrete wall structure of the present invention.

[0033] In the figure: 1. reinforced concrete column; 2. reinforced concrete base; 3. concrete cushion; 4. U-shaped steel sheet pile; 5. prestressed anchor cable; 6. reinforced concrete wall; 7. corrugated steel plate; 8. arc section; 9. connecting section; 10. first drainage hole; 11. second drainage hole; 12. surface layer; 13. base layer; 14. first drainage channel; 15. guide frame; 16. first drainage ditch; 17. third drainage hole; 18. second drainage channel; 19. second drainage ditch; 20. vertical section. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clarify the technical solutions in the embodiments of the present invention; it is clearly described in detail. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention provides Figure 1 to Figure 6 The structure shown is suitable for a shallow buried biased arch tunnel in an urban area, comprising a reinforced concrete column 1, a reinforced concrete base 2 is arranged on both sides of the reinforced concrete column 1, a concrete cushion layer 3 is arranged between the reinforced concrete column 1 and the reinforced concrete base 2 on both sides, and the concrete cushion layer 3 is arranged in an arc shape, and the middle section of the concrete cushion layer 3 is concave downward. The reinforced concrete column 1, the reinforced concrete base 2 and the concrete cushion layer 3 are all made of C30 steel bars and concrete materials, and the structure is stable. The reinforced concrete column 1, the reinforced concrete base 2 and the concrete cushion layer 3 are arranged to form the bottom structure of the tunnel, and the concrete cushion layer 3 is in an arc shape, which can improve the overall stability of the arch tunnel.

[0036] A reinforced concrete wall 6 is integrally formed on the top of the reinforced concrete base 2, and a corrugated steel plate 7 is arranged between the tops of the two reinforced concrete bases 2. The corrugated steel plate 7 is in an arch shape to form a supporting structure.

[0037] The corrugated steel plate 7 includes an arc segment 8, a connecting segment 9 and a vertical segment 20. The arc segment 8 and the vertical segment 20 are both provided in two numbers. The two arc segments 8 are respectively distributed above the two concrete cushion layers 3. The arc segment 8 is arch-shaped. The vertical segment 20 is fixedly installed on the corresponding reinforced concrete base 2. The connecting segment 9 is provided between the two arc segments 8. One end of the arc segment 8 away from the connecting segment 9 is connected to the corresponding vertical segment 20.

[0038] The top of the corrugated steel plate 7 can be backfilled with HT low-carbon new material, or it can be made from local materials and excavated waste soil, which can be adjusted according to specific usage conditions.

[0039] Considering the bias pressure of the mountain, the present invention provides the reinforced concrete wall 6 and the vertical section 20 to prevent the corrugated steel plate 7 lining from being subjected to excessive bias pressure.

[0040] A support assembly for temporary support is provided on the side of the reinforced concrete base 2 facing away from the reinforced concrete column 1. The support assembly is arranged in multiple groups, and the multiple groups of support assemblies are evenly distributed along the length direction of the reinforced concrete base 2. The support assembly includes a U-shaped steel sheet pile 4 and a prestressed anchor cable 5. The U-shaped steel sheet pile 4 is fixedly installed in the access road. The U-shaped steel sheet pile 4 is vertically distributed. One end of the prestressed anchor cable 5 is fixedly connected to the corresponding reinforced concrete base 2, and the other end of the prestressed anchor cable 5 passes through the U-shaped steel sheet pile 4 and is fastened to the access road wall.

[0041] U-shaped steel sheet piles 4 and prestressed anchor cables 5 are used as temporary support for the foundation pit, and M20 mortar can be used for backfilling, and longitudinal drainage holes are reserved at the backfilling location for drainage. The combination of temporary support and backfilling occupies a small area.

[0042] The present invention uses a corrugated steel plate 7 as the arch lining structure of the multi-arch tunnel, and arranges reinforced concrete columns 1, reinforced concrete bases 2, concrete cushions 3, support components, etc., and reduces the distance between the left and right road surface edges of the tunnel from 5m to 2m, greatly reducing the extension line of the roadbed section outside the tunnel, which will be beneficial to environmental protection.

[0043] In order to improve the drainage efficiency inside the tunnel, a guide frame 15 is provided on the side of the reinforced concrete base 2 close to the reinforced concrete column 1, a first drainage ditch 16 is provided on the side of the guide frame 15 close to the reinforced concrete column 1, a first drainage channel 14 is provided on the side of the first drainage ditch 16 close to the reinforced concrete column 1, the first drainage ditch 16 cooperates with the first drainage channel 14, and the first drainage channel 14 is connected to the drainage pipe outside the tunnel. The water on one side of the reinforced concrete base 2 is discharged into the first drainage ditch 16 by the guide frame 15, and is discharged by the first drainage channel 14, and a filter screen or other structure can be provided on the top of the first drainage ditch 16 to filter impurities such as leaves to prevent the first drainage ditch 16 and the first drainage channel 14 from being blocked.

[0044] A second drainage ditch 19 is provided on one side of the reinforced concrete column 1 close to the reinforced concrete base 2, and a second drainage channel 18 is provided below the second drainage ditch 19, and the second drainage ditch 19 cooperates with the second drainage channel 18. The second drainage channel 18 is connected to the drainage pipe outside the tunnel, and the water on one side of the reinforced concrete column 1 is discharged into the second drainage ditch 19 and discharged from the second drainage channel 18. A filter screen or other structure can be provided on the top of the second drainage ditch 19 to filter impurities such as leaves to prevent the second drainage ditch 19 and the second drainage channel 18 from being blocked.

[0045] In order to achieve drainage of the recessed position at the top of the corrugated steel plate 7, a drainage component is arranged between the connecting section 9 and the reinforced concrete wall 6. The drainage components are arranged in multiple groups, and the multiple groups of drainage components are evenly distributed. The drainage components include a first drainage hole 10, a second drainage hole 11 and a third drainage hole 17. The first drainage hole 10 is opened through the connecting section 9, the second drainage hole 11 is opened on the reinforced concrete wall 6, and the third drainage hole 17 is opened at the bottom of the side wall of the reinforced concrete wall 6. One end of the second drainage hole 11 is connected to the first drainage hole 10, and the other end of the second drainage hole 11 is connected to the third drainage hole 17.

[0046] The accumulated water at the concave position of the top end of the corrugated steel plate 7 is discharged into the second drainage ditch 19 through the first drainage hole 10 , the second drainage hole 11 and the third drainage hole 17 , and then discharged through the second drainage channel 18 .

[0047] A filter assembly may be provided at the top of the first drainage hole 10. The filter assembly includes a filter net and other structures, which may filter soil and the like to prevent blockage of the first drainage hole 10, the second drainage hole 11 and the third drainage hole 17, thereby ensuring drainage efficiency.

[0048] A road surface is paved between the first drainage channel 14 and the second drainage ditch 19, and the road surface includes a surface layer 12 and a base layer 13, and the base layer 13 is located below the surface layer 12. The base layer 13 can be made of, but not limited to, graded crushed stone, lime-stabilized soil, cement crushed stone and other materials. Graded crushed stone is a commonly used base material, which has good bearing capacity and stability, can effectively disperse vehicle loads and prevent road deformation. Lime-stabilized soil is a material that improves the engineering properties of soil by adding lime. It can improve the strength and stability of the soil and is suitable for occasions where strength requirements are not particularly high. Cement crushed stone is a more solid choice. Through the bonding effect of cement, it forms a stronger bond between the crushed stones and is suitable for occasions that need to withstand greater pressure and load.

[0049] The surface layer 12 may be made of, but not limited to, asphalt material, which has obvious advantages in terms of wear resistance and is not prone to surface wear. In addition, asphalt itself has excellent adhesion, which can ensure that the wear resistance of the road surface is long-lasting.

[0050] The road surface is inclined, and one end of the road surface close to the first drainage channel 14 is inclined downward with a suitable inclination angle to prevent water accumulation and improve drainage efficiency.

[0051] The present invention also discloses a construction method applicable to a shallow buried biased double-arch tunnel in an urban area, comprising the above-mentioned shallow buried biased double-arch tunnel structure applicable to an urban area, and further comprising the following steps:

[0052] S1, excavate the construction access road along the designed plane position of the U-shaped steel sheet pile 4, and then construct the U-shaped steel sheet pile 4;

[0053] After the construction of S2 and U-shaped steel sheet piles 4 is completed, the foundation pit is excavated, and the reinforced concrete column 1, reinforced concrete base 2 and concrete cushion 3 are constructed. After completion, the gap between the reinforced concrete base 2 and the U-shaped steel sheet piles 4 is backfilled with M20 mortar, and then the prestressed anchor cable 5 is constructed;

[0054] S3, construct reinforced concrete wall 6 and reserve longitudinal drainage holes;

[0055] S4, assembling corrugated steel plate 7;

[0056] S5. Use HT low-carbon new material for backfilling.

Claims

1. A structure suitable for shallow buried biased arch tunnel in an urban area, comprising a reinforced concrete column (1), characterized in that: Reinforced concrete bases (2) are provided on both sides of the reinforced concrete column (1), concrete cushion layers (3) are provided between the reinforced concrete column (1) and the reinforced concrete bases (2) on both sides, a reinforced concrete wall (6) is integrally formed on the top of the reinforced concrete base (2), and a corrugated steel plate (7) is provided between the tops of the two reinforced concrete bases (2); The corrugated steel plate (7) comprises an arc segment (8), a connecting segment (9) and a vertical segment (20), wherein the arc segment (8) and the vertical segment (20) are both provided in two numbers, the two arc segments (8) are respectively distributed above the two concrete cushion layers (3), the arc segment (8) is in an arch shape, the vertical segment (20) is fixedly mounted on the corresponding reinforced concrete base (2), the connecting segment (9) is provided between the two arc segments (8), and the end of the arc segment (8) away from the connecting segment (9) is connected to the corresponding vertical segment (20); A support component for temporary support is arranged on the side of the reinforced concrete base (2) facing away from the reinforced concrete column (1), and the support component comprises a U-shaped steel sheet pile (4) and a prestressed anchor cable (5).

2. The structure of a shallow-buried biased double-arch tunnel suitable for use in an urban area according to claim 1, characterized in that: The concrete cushion layer (3) is arranged in an arc shape, and the middle section of the concrete cushion layer (3) is concave downwards.

3. The shallow buried biased double-arch tunnel structure applicable to cities according to claim 1 is characterized by: The U-shaped steel sheet piles (4) are fixedly installed in the access road, and the U-shaped steel sheet piles (4) are vertically distributed. One end of the prestressed anchor cable (5) is fixedly connected to the corresponding reinforced concrete base (2), and the other end of the prestressed anchor cable (5) passes through the U-shaped steel sheet piles (4) and is fastened to the access road wall.

4. The structure of a shallow-buried biased double-arch tunnel suitable for use in an urban area according to claim 3, characterized in that: The support components are arranged in multiple groups, and the multiple groups of support components are evenly distributed along the length direction of the reinforced concrete base (2).

5. The structure of a shallow-buried biased double-arch tunnel suitable for use in an urban area according to claim 1, characterized in that: A drainage component is provided between the connecting section (9) and the reinforced concrete wall (6), and the drainage component comprises a first drainage hole (10), a second drainage hole (11) and a third drainage hole (17); the first drainage hole (10) is provided through the connecting section (9); the second drainage hole (11) is provided on the reinforced concrete wall (6); the third drainage hole (17) is provided at the bottom of the side wall of the reinforced concrete wall (6); one end of the second drainage hole (11) is communicated with the first drainage hole (10); and the other end of the second drainage hole (11) is communicated with the third drainage hole (17).

6. The structure of a shallow-buried biased double-arch tunnel applicable to an urban area according to claim 5, characterized in that: The drainage components are arranged in multiple groups, and the multiple groups of drainage components are evenly distributed.

7. The shallow buried biased double-arch tunnel structure applicable to cities according to claim 1 is characterized by: A flow guide frame (15) is provided on the side of the reinforced concrete base (2) close to the reinforced concrete column (1); a first drainage ditch (16) is provided on the side of the flow guide frame (15) close to the reinforced concrete column (1); a first drainage channel (14) is provided on the side of the first drainage ditch (16) close to the reinforced concrete column (1); the first drainage ditch (16) cooperates with the first drainage channel (14); a second drainage ditch (19) is provided on the side of the reinforced concrete column (1) close to the reinforced concrete base (2); a second drainage channel (18) is provided below the second drainage ditch (19); the second drainage ditch (19) cooperates with the second drainage channel (18).

8. The structure of a shallow-buried biased double-arch tunnel applicable to an urban area according to claim 7, characterized in that: A road surface is paved between the first drainage channel (14) and the second drainage ditch (19), and the road surface comprises a surface layer (12) and a base layer (13), wherein the base layer (13) is located below the surface layer (12).

9. The shallow buried biased double-arch tunnel structure applicable to cities according to claim 8, characterized in that: The road surface is arranged inclined, and one end of the road surface close to the first drainage channel (14) is inclined downward.

10. A construction method for shallow buried biased double arch tunnel in cities, characterized by: The method comprises the structure applicable to an urban shallow buried biased multi-arch tunnel as claimed in any one of claims 1 to 9, and further comprises the following steps: S1, excavating a construction access road along the designed plane position of the U-shaped steel sheet pile (4), and then constructing the U-shaped steel sheet pile (4); After the construction of S2 and U-shaped steel sheet piles (4) is completed, a foundation pit is excavated, and reinforced concrete columns (1), reinforced concrete bases (2) and concrete cushions (3) are constructed. After completion, the gap between the reinforced concrete bases (2) and the U-shaped steel sheet piles (4) is backfilled with M20 mortar, and then prestressed anchor cables (5) are constructed; S3, constructing reinforced concrete walls (6) and reserving longitudinal drainage holes; S4, assembling corrugated steel plates (7); S5. Use HT low-carbon new material for backfilling.

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