Drainage device for tunnel steel supporting structure

Abstract

According to the drainage device for the tunnel steel supporting structure, the tunnel steel supporting structure comprises a corrugated steel plate layer and an arc-shaped steel plate layer, and the drainage device comprises a concrete water collecting area arranged on a corrugated steel plate of a prefabricated supporting piece and a drainage pipe arranged between the corrugated steel plate and the arc-shaped steel plate. The drainage pipes are connected with the water collection cavities of the multiple concrete water collection areas in the same column through the flow guide pipe sets, and leakage water of surrounding rock can flow into the water collection cavities through the flow guide faces of the multiple concrete water collection areas, then flow into the multiple drainage pipes and are discharged out of the tunnel. The assembly type waterproof supporting structure has the advantages of semi-mechanized construction and rapid assembly, the effectiveness of tunnel water prevention and drainage in a water-rich area can be guaranteed to the maximum extent, leakage water is prevented from being accumulated in the steel supporting structure, potential safety hazards are eliminated, and the structural safety of the tunnel in the construction period and the operation period is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of tunnel steel supporting structures, and in particular to a drainage device used for tunnel steel supporting structures. Background Art

[0002] The tunnel steel support structure is used to support the excavation surface during the tunnel excavation process. The existing commonly used steel support structure consists of multiple prefabricated support members. When a new circle of excavation surface is excavated along the length direction of the tunnel, multiple prefabricated support members are installed from the tunnel arch foot to the excavation surface in sequence to form a circle of semi-annular support structure. As the tunnel is continuously excavated, prefabricated support members are continuously installed on the new circle of excavation surface, so that adjacent semi-annular support structures are connected in sequence along the length direction of the tunnel, and finally a steel support structure covering the entire excavation surface of the tunnel is formed. The steel support structure includes a corrugated steel plate layer and a curved steel plate layer. The corrugated steel plate layer is located between the curved steel plate layer and the inner wall of the surrounding rock of the tunnel. The corrugated steel plate layer and the curved steel plate layer are respectively composed of corrugated steel plates and curved steel plates on multiple prefabricated support members, the anchor rods passed through the corrugated steel plates are inserted into the surrounding rock, and grouting is performed between the corrugated steel plate layer and the surrounding rock, as well as between the corrugated steel plate layer and the curved steel plate layer, so that the surrounding rock, anchor rods, corrugated steel plates and curved steel plates form an integral structure. However, when the seepage water of the tunnel leaks from the surrounding rock to the steel support structure, it is difficult for the steel support structure to discharge the seepage water in time, especially for water-rich areas with heavy rain, abundant groundwater resources and complex geological conditions. The existing tunnel steel support structure will cause safety hazards due to the accumulation of seepage water inside, and it is difficult to ensure the structural safety of the tunnel during the construction and operation periods. Summary of the invention

[0003] The purpose of the present invention is to provide a drainage device for a tunnel steel support structure to prevent leakage water from accumulating inside the steel support structure and ensure the structural safety of the tunnel during the construction and operation periods.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a drainage device for a tunnel steel support structure, wherein the tunnel steel support structure comprises a corrugated steel plate layer and an arc-shaped steel plate layer, the corrugated steel plate layer is located between the arc-shaped steel plate layer and the inner wall of the tunnel surrounding rock, the protruding portion of the corrugated steel plate layer close to the surrounding rock is defined as a wave crest, and the protruding portion close to the arc-shaped steel plate layer is defined as a wave trough, the wave crests and the wave troughs are alternately distributed along the axial direction of the tunnel, a plurality of wave crest positions are respectively and spaced apart with a plurality of anchor rods, one end of the anchor rod is inserted into the surrounding rock from the outer cavity between the corrugated steel plate layer and the surrounding rock, and the other end of the anchor rod extends to the corrugated steel plate layer. The inner cavity between the corrugated steel plate layer and the arc steel plate layer, the outer cavity and the inner cavity are respectively filled with waterproof materials formed by solidification after grouting, the corrugated steel plate layer and the arc steel plate layer are respectively composed of a plurality of corrugated steel plates and a plurality of arc steel plates, and the plurality of corrugated steel plates and the plurality of arc steel plates correspond to each other to form a plurality of prefabricated support members, and the prefabricated support members also include longitudinal flange plates and annular flange plates connected to the edges of the corrugated steel plates and the arc steel plates, the annular flange plates of two prefabricated support members adjacent to each other along the circumference of the tunnel are fitted and connected, and the longitudinal flange plates of two prefabricated support members adjacent to each other along the axial direction of the tunnel are fitted and connected, The drainage device includes a plurality of concrete water collection areas located in the outer cavity and a plurality of drainage pipes located in the inner cavity. The length direction of the drainage pipe is parallel to the axial direction of the tunnel. The plurality of drainage pipes are spaced apart along the circumference of the tunnel. The concrete water collection areas are attached to the surface of the corrugated steel plate and cover the trough and the side of the inclined surface on both sides of the trough facing the surrounding rock. The plurality of concrete water collection areas are divided into a plurality of rows. The plurality of concrete water collection areas in the same row are arranged along the axial direction of the tunnel. The plurality of rows of concrete water collection areas are spaced apart along the circumference of the tunnel, and the plurality of rows of concrete water collection areas are respectively close to the plurality of drainage pipes. A cylindrical water collection cavity is provided on the concrete water collection area, the axis of which is located on the central plane of the trough and tangent to the circumference of the tunnel, a water inlet is provided on the side of the water collection cavity away from the trough, and two sections of guide surfaces are provided on the side of the concrete water collection area away from the trough, the two sections of guide surfaces extend from the water inlet along the direction close to the surrounding rock and close to the wave crests on both sides, so that the leakage water of the surrounding rock can flow into the water collection cavity from the two sections of guide surfaces, a guide pipe group is connected between the corrugated steel plate and the drainage pipe, one end of the guide pipe group passes through the corrugated steel plate and the concrete water collection area and extends to the water collection cavity, so that the leakage water in the water collection cavity can flow out of the tunnel through the drainage pipe.

[0005] Preferably, the distance between the axis of the water collecting chamber and the wave trough along the radial direction of the tunnel is not less than 1 / 2 of the amplitude of the corrugated steel plate, and the diameter of the water collecting chamber does not exceed 1 / 5 of the wave pitch of the corrugated steel plate.

[0006] Preferably, the guide pipe group includes a single-sided pipe group and a double-sided pipe group. The single-sided pipe group includes a vertical pipe connected to the drain pipe at a vertical position, and the end of the vertical pipe away from the drain pipe is connected to an inclined pipe, which passes through the inclined surface on one side of the trough and extends to the water collection chamber; the double-sided pipe group also includes a vertical pipe connected to the drain pipe at a vertical position, and the end of the vertical pipe away from the drain pipe is connected to two inclined pipes at the same time, and the two inclined pipes respectively pass through the inclined surfaces on the opposite sides of two adjacent troughs and extend to the two water collection chambers respectively.

[0007] Preferably, the vertical tubes and the inclined tubes of the single-sided tube group are integrally formed.

[0008] Preferably, the vertical pipe and the two inclined pipes of the double-sided pipe group are connected by a three-way joint.

[0009] Preferably, a plurality of support bodies are provided on the side of the arc-shaped steel plate facing the corrugated steel plate, and the support bodies are in contact with the side of the drain pipe away from the corrugated steel plate, thereby supporting the drain pipe, and the contact positions of the plurality of support bodies with the drain pipe include the axial positions where the drain pipe is respectively connected to all vertical pipes.

[0010] Preferably, grouting holes are provided on the longitudinal flange plate and / or the annular flange plate.

[0011] According to the above technical solution, the beneficial effects of the present invention are: The present invention arranges a concrete water collection area on the corrugated steel plate of the prefabricated support, and arranges a drainage pipe between the corrugated steel plate and the curved steel plate, and then connects the drainage pipe to the water collection cavity of multiple concrete water collection areas in the same row through a guide pipe group. The leakage water of the surrounding rock can flow into the water collection cavity through the guide surfaces of the multiple concrete water collection areas, and then flow into the multiple drainage pipes and be discharged outside the tunnel. Compared with the traditional waterproof system, the prefabricated waterproof support structure has the advantages of semi-mechanized construction and rapid assembly, which can maximize the effectiveness of tunnel waterproofing and drainage in water-rich areas, prevent leakage water from accumulating inside the steel support structure, eliminate safety hazards, ensure the structural safety of the tunnel during the construction and operation periods, and have extremely high comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the axial schematic diagram of the tunnel steel support structure; Figure 2 It is a partial schematic diagram of a prefabricated support member; Figure 3 is a schematic diagram of the drainage device; Figure 4 Schematic diagram of the circumferential distribution of multiple concrete water collection areas.

[0013] Markings in the figure: 1. surrounding rock, 2. anchor rod, 3. corrugated steel plate, 4. curved steel plate, 5. longitudinal flange plate, 6. circumferential flange plate, 7. concrete water collection area, 8. water collection cavity, 9. diversion surface, 10. drainage pipe, 11. support body, 12. vertical pipe, 13. inclined pipe, 14. three-way joint. DETAILED DESCRIPTION

[0014] With reference to the accompanying drawings, the specific implementation is as follows: like Figure 1 , 2 As shown, a drainage device for a tunnel steel support structure, the tunnel steel support structure includes a corrugated steel plate layer and a curved steel plate layer, the corrugated steel plate layer is located between the curved steel plate layer and the inner wall of the tunnel surrounding rock 1, the protruding portion of the corrugated steel plate layer close to the surrounding rock 1 is defined as a crest, and the protruding portion close to the curved steel plate layer is defined as a trough, the crests and troughs are alternately distributed along the axial direction of the tunnel, and multiple anchor rods 2 are respectively arranged at intervals at multiple crest positions, and one end of the anchor rod 2 is inserted into the surrounding rock 1 from the outer cavity between the corrugated steel plate layer and the surrounding rock 1.

[0015] like Figure 3 As shown, the other end of the anchor rod 2 extends to the inner cavity between the corrugated steel plate layer and the arc-shaped steel plate layer, the outer cavity and the inner cavity are respectively filled with waterproof materials formed by solidification after grouting, the corrugated steel plate layer and the arc-shaped steel plate layer are respectively composed of a plurality of corrugated steel plates 3 and a plurality of arc-shaped steel plates 4, and the plurality of corrugated steel plates 3 and the plurality of arc-shaped steel plates 4 correspond to each other to form a plurality of prefabricated support members, and the prefabricated support members also include a longitudinal flange plate 5 and an annular flange plate 6 connected to the edges of the corrugated steel plate 3 and the arc-shaped steel plate 4, the annular flange plates 6 of two prefabricated support members adjacent to each other along the circumference of the tunnel are fitted and connected, and the longitudinal flange plates 5 of two prefabricated support members adjacent to each other along the axial direction of the tunnel are fitted and connected.

[0016] like Figure 3 , 4 As shown, the drainage device includes a plurality of concrete water collection areas 7 located in the outer cavity and a plurality of drainage pipes 10 located in the inner cavity. The length direction of the drainage pipes 10 is parallel to the axial direction of the tunnel. The plurality of drainage pipes 10 are spaced apart along the circumference of the tunnel. The concrete water collection areas 7 are attached to the surface of the corrugated steel plate 3 and cover the trough and the side of the inclined surface on both sides of the trough facing the surrounding rock 1. The plurality of concrete water collection areas 7 are divided into a plurality of columns. The plurality of concrete water collection areas 7 in the same column are arranged along the axial direction of the tunnel. The plurality of columns of concrete water collection areas 7 are spaced apart along the circumference of the tunnel, and the plurality of columns of concrete water collection areas 7 are respectively close to the plurality of drainage pipes 10.

[0017] like Figure 3As shown, a cylindrical water collection cavity 8 is provided on the concrete water collection area 7, the axis of the water collection cavity 8 is located on the central plane of the wave trough and is tangent to the circumference of the tunnel, the distance between the axis of the water collection cavity 8 and the wave trough along the radial direction of the tunnel is not less than 1 / 2 of the amplitude of the corrugated steel plate 3, and the diameter of the water collection cavity 8 does not exceed 1 / 5 of the wave pitch of the corrugated steel plate 3. A water inlet is provided on the side of the water collection cavity 8 away from the wave trough, and two sections of guide surfaces 9 are provided on the side of the concrete water collection area 7 away from the wave trough. The two sections of guide surfaces 9 extend from the water inlet along the direction close to the surrounding rock 1 and close to the wave crests on both sides, so that the seepage water of the surrounding rock 1 flows into the water collection cavity 8 from the two sections of guide surfaces 9. A guide pipe group is connected between the corrugated steel plate 3 and the drainage pipe 10, one end of which passes through the corrugated steel plate 3 and the concrete water collection area 7 and extends to the water collection cavity 8, so that the seepage water in the water collection cavity 8 flows out of the tunnel through the drainage pipe 10.

[0018] like Figure 3 As shown, the guide pipe group includes a single-sided pipe group and a double-sided pipe group. The single-sided pipe group includes a vertical pipe 12 vertically connected to the drainage pipe 10, and the vertical pipe 12 and the inclined pipe 13 of the single-sided pipe group are integrally formed. The end of the vertical pipe 12 away from the drainage pipe 10 is connected to an inclined pipe 13, and the inclined pipe 13 passes through the inclined surface on one side of the trough and extends to the water collecting chamber 8.

[0019] like Figure 3 As shown, the double-sided pipe group also includes a vertical pipe 12 vertically connected to the drain pipe 10. The end of the vertical pipe 12 away from the drain pipe 10 is connected to two inclined pipes 13 at the same time through a three-way joint 14. The two inclined pipes 13 respectively penetrate the inclined surfaces on the opposite sides of two adjacent troughs and extend to the two water collection chambers 8 respectively.

[0020] like Figure 3 As shown, a plurality of support bodies 11 are provided on the side of the arc steel plate 4 facing the corrugated steel plate 3. The support bodies 11 are in contact with the side of the drain pipe 10 away from the corrugated steel plate 3, thereby supporting the drain pipe 10. The contact positions of the plurality of support bodies 11 and the drain pipe 10 include the axial positions where the drain pipe 10 is connected to all the vertical pipes 12 respectively. The support bodies 11 can ensure that the drain pipe 10 will not be displaced or deformed due to the slurry during grouting. Since the drain pipe 10 is relatively long, the drain pipe 10 usually adopts a segmented structure. When adjacent prefabricated support members are connected along the length direction of the tunnel, not only the adjacent two longitudinal flange plates 5 are fitted and connected, but also the ends of the drain pipe 10 on the adjacent two longitudinal flange plates 5 are butted together to form a whole, so that the drain pipe 10 can be gradually extended along the assembly process of the steel support structure, ensuring that the water collection chamber 8 of the newly assembled steel support structure is connected to the drain pipe 10.

[0021] In this embodiment, before the excavation process of the tunnel, the corrugated steel plate 3, the curved steel plate 4, the longitudinal flange plate 5 and the annular flange plate 6 are connected and formed, and the anchor rod 2 is inserted into the corrugated steel plate 3. Then, concrete is filled on the surface of the corrugated steel plate 3 through a mold, and a guide surface 9 and a water collecting cavity 8 are formed on the concrete. A vertical pipe 12, an inclined pipe 13 and a section of drainage pipe 10 are installed between the corrugated steel plate 3 and the curved steel plate 4 to obtain a prefabricated support. After a new excavation surface is dug along the length of the tunnel, multiple prefabricated supports are installed from the tunnel arch foot to the excavation surface in sequence, and grouting is performed between the corrugated steel plate 3 and the arc steel plate 4 through the grouting holes opened on the longitudinal flange plate 5 or the annular flange plate 6, so that the anchor rod 2 and the steel structure can quickly form a whole. After the grouting of the adjacent annular steel structure is completed, the annular flange and high-strength bolts are used for annular assembly to form a semi-annular support structure, and then the wall back grouting is performed between the corrugated steel plate 3 and the surrounding rock 1, so that the surrounding rock 1, the anchor rod 2, and the steel structure form a supporting whole. After the annular assembly of the steel structure is completed, the longitudinal assembly is carried out. During the longitudinal assembly, it is still assembled symmetrically from the arch foot to the middle, and the adjacent two steel structures are connected by high-strength bolts, and the drainage pipes 10 at the corresponding positions are connected. The corrugated steel arch foot is connected to the cast-in-place concrete pier through anchor bolts and steel connectors to achieve the stability of the arch foot.

[0022] After the steel support structure is set up, the leakage water in the tunnel surrounding rock is collected through the concrete collection area 7. When the water level in the water collection chamber 8 is higher than the connection position between the inclined pipe 13 and the water collection chamber 8, the leakage water flows into the inclined pipe 13 and the vertical pipe 12 in turn, and finally flows into the drainage pipe 10 and is discharged outside the tunnel, which can maximize the effectiveness of tunnel drainage.

Claims

1. A drainage device for a tunnel steel support structure, the tunnel steel support structure comprising a corrugated steel plate layer and an arc-shaped steel plate layer, the corrugated steel plate layer being located between the arc-shaped steel plate layer and the inner wall of the tunnel surrounding rock (1), the protruding portion of the corrugated steel plate layer close to the surrounding rock (1) being defined as a wave crest, and the protruding portion close to the arc-shaped steel plate layer being defined as a wave trough, the wave crests and the wave troughs being alternately distributed along the axial direction of the tunnel, a plurality of wave crest positions being interspersed with a plurality of anchor rods (2) at intervals, one end of the anchor rod (2) being inserted into the surrounding rock (1) from an outer cavity between the corrugated steel plate layer and the surrounding rock (1), and the other end of the anchor rod (2) extending to an inner cavity between the corrugated steel plate layer and the arc-shaped steel plate layer. The outer cavity and the inner cavity are respectively filled with waterproof materials formed by solidification after grouting, the corrugated steel plate layer and the arc steel plate layer are respectively composed of a plurality of corrugated steel plates (3) and a plurality of arc steel plates (4), and the plurality of corrugated steel plates (3) and the plurality of arc steel plates (4) correspond to each other to form a plurality of prefabricated support members, and the prefabricated support members also include longitudinal flange plates (5) and annular flange plates (6) connected to the edges of the corrugated steel plates (3) and the arc steel plates (4), the annular flange plates (6) of two prefabricated support members adjacent to each other along the circumference of the tunnel are fitted and connected, and the longitudinal flange plates (5) of two prefabricated support members adjacent to each other along the axial direction of the tunnel are fitted and connected, characterized in that: The drainage device comprises a plurality of concrete water collection areas (7) located in the outer cavity and a plurality of drainage pipes (10) located in the inner cavity, the length direction of the drainage pipes (10) being parallel to the axial direction of the tunnel, the plurality of drainage pipes (10) being spaced apart along the circumference of the tunnel, the concrete water collection areas (7) being attached to the surface of the corrugated steel plate (3) and covering the trough and the side of the inclined surface on both sides of the trough facing the surrounding rock (1), the plurality of concrete water collection areas (7) being divided into a plurality of rows, the plurality of concrete water collection areas (7) in the same row being arranged along the axial direction of the tunnel, the plurality of rows of concrete water collection areas (7) being spaced apart along the circumference of the tunnel, and the plurality of rows of concrete water collection areas (7) being respectively close to the plurality of drainage pipes (10); A cylindrical water collecting cavity (8) is provided on the concrete water collecting area (7). The axis of the water collecting cavity (8) is located on the central plane of the wave trough and is tangent to the circumference of the tunnel. A water inlet is provided on the side of the water collecting cavity (8) away from the wave trough. The side of the concrete water collecting area (7) away from the wave trough has two sections of guide surfaces (9). The two sections of guide surfaces (9) extend from the water inlet along directions close to the surrounding rock (1) and close to the wave crests on both sides, respectively, so that seepage water of the surrounding rock (1) flows into the water collecting cavity (8) from the two sections of guide surfaces (9). A guide pipe group is connected between the corrugated steel plate (3) and the drainage pipe (10). One end of the guide pipe group passes through the corrugated steel plate (3) and the concrete water collecting area (7) and extends to the water collecting cavity (8), so that seepage water in the water collecting cavity (8) flows out of the tunnel through the drainage pipe (10).

2. A drainage device for a tunnel steel support structure according to claim 1, characterized in that: The distance between the axis of the water collecting chamber (8) and the wave trough along the radial direction of the tunnel is not less than 1 / 2 of the amplitude of the corrugated steel plate (3), and the diameter of the water collecting chamber (8) is not more than 1 / 5 of the wave pitch of the corrugated steel plate (3).

3. A drainage device for a tunnel steel support structure according to claim 1, characterized in that: The flow guide pipe group comprises a single-sided pipe group and a double-sided pipe group. The single-sided pipe group comprises a vertical pipe (12) vertically connected to the drainage pipe (10), one end of the vertical pipe (12) away from the drainage pipe (10) is connected to an inclined pipe (13), and the inclined pipe (13) passes through the inclined surface on one side of the wave trough and extends to the water collection chamber (8); the double-sided pipe group also comprises a vertical pipe (12) vertically connected to the drainage pipe (10), one end of the vertical pipe (12) away from the drainage pipe (10) is simultaneously connected to two inclined pipes (13), and the two inclined pipes (13) respectively pass through the inclined surfaces on the opposite sides of two adjacent wave troughs and respectively extend to the two water collection chambers (8).

4. A drainage device for a tunnel steel support structure according to claim 3, characterized in that: The vertical tube (12) and the inclined tube (13) of the single-sided tube group are integrally formed.

5. The drainage device for a tunnel steel support structure according to claim 3, characterized in that: The vertical pipe (12) and two inclined pipes (13) of the double-sided pipe group are connected via a three-way joint (14).

6. A drainage device for a tunnel steel support structure according to claim 3, characterized in that: A plurality of support bodies (11) are provided on a side of the arc-shaped steel plate (4) facing the corrugated steel plate (3), and the support bodies (11) are in contact with a side of the drainage pipe (10) away from the corrugated steel plate (3), thereby supporting the drainage pipe (10), and the contact positions of the plurality of support bodies (11) and the drainage pipe (10) include the axial positions where the drainage pipe (10) is respectively connected to all the vertical pipes (12).

7. The drainage device for a tunnel steel support structure according to claim 1, characterized in that: Grouting holes are provided on the longitudinal flange plate (5) and / or the annular flange plate (6).

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