Tunnel slurry stopping wall crossing debris flow accumulation body

Abstract

The utility model relates to tunnel construction technical field, concretely relates to a kind of tunnel grout stop wall crossing debris flow accumulation, including wall and base, one side of the wall is attached with working face, and the outer periphery of the wall is attached with the circumferential wall surface of tunnel;The base is located at the bottom of the wall, and is seated on the stratum below the tunnel, and the contact area between the base and the bottom surface of the tunnel is greater than the bottom surface area of the wall.The utility model adds base structure at the bottom of grout stop wall wall, so that the contact area of grout stop wall bottom and stratum below tunnel is increased, the pressure of grout stop wall to stratum below is reduced, combined with the joint of grout stop wall and working face and tunnel circumferential wall surface, the subsidence of grout stop wall can be relieved under the construction condition of stratum below, the stability of grout stop wall wall in curtain grouting operation can be maintained, and the construction quality and safety are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a grout-stopping wall for tunnels traversing debris flow deposits. Background Technology

[0002] When tunnel construction encounters soft and unfavorable strata such as debris flow deposits, excavation disturbance can easily trigger overlying rock and soil collapse and tunnel collapse risks. Therefore, pre-reinforcement with curtain grouting is necessary before excavation. Before this process, a grout-stopping wall must be poured at the tunnel face to seal it and prevent backflow and leakage of high-pressure grouting fluid. However, in some particularly challenging geological conditions, the grout-stopping wall alone, relying solely on the consolidation of the tunnel face and the inner wall of the tunnel roof, may not provide sufficient stability. For example, if the rock strata at the tunnel bottom are soft, the pressure exerted by the bottom of the grout-stopping wall on the underlying rock strata after pouring can easily lead to downward collapse, affecting the curtain grouting operation, impacting project quality, and creating safety hazards. Utility Model Content

[0003] The purpose of this utility model is to overcome the technical problem that existing grout-stopping walls are prone to collapse during curtain grouting operations due to the weak underlying strata, which affects the quality of the project and causes safety hazards. This utility model provides a grout-stopping wall for tunnels that pass through debris flow deposits.

[0004] This utility model provides a grout-stopping wall for tunnels traversing debris flow deposits, comprising a wall body and a base. One side of the wall body is in contact with the tunnel face, and the outer periphery of the wall body is in contact with the circumferential wall of the tunnel. The base body is located at the bottom of the wall body and sits on the stratum below the tunnel. The contact area between the base body and the bottom surface of the tunnel is larger than the bottom surface area of ​​the wall body.

[0005] This invention adds a base structure to the bottom of the grout-stopping wall, increasing the contact area between the bottom of the grout-stopping wall and the stratum below the tunnel, reducing the pressure of the grout-stopping wall on the stratum below. Combined with the connection between the grout-stopping wall and the tunnel face and circumferential wall, it can alleviate the subsidence of the grout-stopping wall under construction conditions of soft stratum below. The base can be cast together with the wall to form an integral structure, or a portion of the surrounding rock below can be left unexcavated during tunnel excavation, and grout can be injected into the retained surrounding rock to form the base structure, and then the wall structure of the grout-stopping wall can be constructed on top of the base structure. The base structure formed by the above methods has sufficient rigidity and hardness, and at the same time forms a sufficiently large stress area with the stratum below, which can maintain the stability of the grout-stopping wall during curtain grouting operations, ensuring construction quality and safety.

[0006] Preferably, the base includes the undisturbed surrounding rock at the bottom of the tunnel and grout injected into the undisturbed surrounding rock.

[0007] Preferably, a plurality of steel mesh is embedded in the wall.

[0008] Preferably, the steel mesh includes transverse mesh and longitudinal mesh, which are arranged to cross each other.

[0009] Preferably, a plurality of anchor bolts are connected between the wall and the circumferential wall of the tunnel.

[0010] Preferably, a plurality of the anchor rods are arranged circumferentially along the wall of the tunnel, with one end of the anchor rod anchored in the circumferential wall of the tunnel and the other end of the anchor rod anchored in the wall.

[0011] Preferably, a working platform is provided above the base, and the working platform is connected to the wall.

[0012] Preferably, the side of the work platform away from the wall has a slope.

[0013] Preferably, the working platform extends from above the base in a direction away from the wall to above the bottom surface of the tunnel.

[0014] Preferably, an early-strength agent is added to the concrete used to pour the wall.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention provides a grout-stopping wall for tunnels traversing debris flow deposits. A base structure is added to the bottom of the grout-stopping wall, increasing the contact area between the bottom of the wall and the underlying strata, thus reducing the pressure exerted by the wall on the strata. Combined with the connection between the grout-stopping wall and the tunnel face and circumferential wall, it can alleviate the subsidence of the grout-stopping wall under construction conditions in soft underlying strata. The base can be cast integrally with the wall using concrete, or a portion of the underlying surrounding rock can be left unexcavated during tunnel excavation, and grout can be injected into this retained rock to form the base structure. The grout-stopping wall structure is then constructed on top of the base structure. The base structures formed by these various methods all possess sufficient rigidity and hardness, and simultaneously create a sufficiently large stress-bearing area with the underlying strata, maintaining the stability of the grout-stopping wall during curtain grouting operations, ensuring construction quality and safety. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional view of the tunnel where the grouting wall is located.

[0018] Figure 2 A schematic diagram of the radial cross-section of the tunnel where the grouting wall is located.

[0019] Marked in the image:

[0020] 1. Wall, 2. Foundation, 3. Steel mesh, 31. Horizontal mesh, 32. Vertical mesh, 4. Anchor bolt, 5. Working platform, 51. Slope, 6. Working face. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0022] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0025] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0027] Example

[0028] This embodiment provides a grout-stopping wall for tunnels traversing debris flow deposits.

[0029] Figure 1 A longitudinal sectional view of the tunnel where the grouting wall is located; Figure 2 A schematic diagram of the radial cross-section of the tunnel where the grouting wall is located.

[0030] like Figure 1 and Figure 2 As shown, the grout-stopping wall of the tunnel traversing debris flow deposits of this utility model includes a wall 1 and a base 2. One side of the wall 1 is attached to the tunnel face 6, and the outer periphery of the wall 1 is attached to the circumferential wall of the tunnel. The base 2 is located at the bottom of the wall 1 and sits on the stratum below the tunnel. The contact area between the base 2 and the bottom surface of the tunnel is larger than the bottom surface area of ​​the wall 1.

[0031] This invention adds a base structure 2 to the bottom of the grout-stopping wall 1, increasing the contact area between the bottom of the grout-stopping wall and the stratum below the tunnel, reducing the pressure of the grout-stopping wall on the stratum below. Combined with the connection between the grout-stopping wall and the tunnel face 6 and the tunnel circumferential wall, it can alleviate the subsidence of the grout-stopping wall under the construction conditions of the soft stratum below. The base 2 can be cast together with the wall 1 to form an integral structure by concrete pouring, or a part of the surrounding rock below can be left unexcavated during tunnel excavation, and grout can be injected into the reserved surrounding rock to form the base structure 2, and then the wall 1 structure of the grout-stopping wall can be constructed on top of the base structure. The base structure 2 formed by the above methods has sufficient rigidity and hardness, and at the same time forms a sufficiently large stress area with the stratum below, which can maintain the stability of the grout-stopping wall 1 in the curtain grouting operation, ensuring construction quality and safety.

[0032] Depend on Figure 1As can be seen, the longitudinal dimension of the base 2 along the tunnel is significantly larger than the thickness of the wall 1. This results in the force-bearing area between the base 2 and the underlying stratum being larger than the bottom area of ​​the wall 1. Compared to not setting the base 2 and allowing the wall 1 to sit directly on the underlying stratum, this reduces the pressure of the grout-stopping wall on the underlying stratum, thereby alleviating or even preventing the grout-stopping wall from sinking. Specifically, two methods can be used to form the grout-stopping wall. The first method involves casting the base 2 and the wall 1 together. This requires creating a flat bottom surface during the initial excavation of the tunnel. Then, a formwork for casting the wall 1 and base 2 is erected in front of the tunnel face 6. A steel mesh 3 is then installed between the formwork and the tunnel face 6, i.e., in the casting space between the wall 1 and the base 2. Concrete is then poured from bottom to top into the casting space between the formwork and the tunnel face 6 to form the base 2. The first method involves an integrated grout-stopping wall structure with the wall 1. The second method involves preserving the surrounding rock and grouting to form a base 2, then pouring concrete to form the wall 1. During the initial excavation of the tunnel, it is necessary to avoid excavating the surrounding rock at the location of the base 2 and to shape the surrounding rock at the location of the base 2 accordingly. Grouting is then injected into the surrounding rock to reinforce the surrounding rock structure and serve as the base 2. The wall 1 template is then erected above the base 2 and in front of the tunnel face 6 at the corresponding position, and the steel mesh 3 in the wall 1 is supported. Finally, concrete is poured in the pouring space between the wall 1 template above the base 2 and the tunnel face 6 to form the wall 1 structure. The final grout-stopping wall structure is a base 2 formed by grouting the lower surrounding rock and a wall 1 formed by pouring concrete on the upper part. Both methods can achieve the effect of preventing subsidence.

[0033] Alternatively, the base 2 includes the unexcavated surrounding rock at the bottom of the tunnel and the grout injected into the unexcavated surrounding rock; the second method of forming the grout stop wall, that is, the method of grouting the base 2 in the unexcavated surrounding rock at the bottom of the tunnel to form the base 2, can reduce the amount of excavation compared with the method of simultaneously pouring the base 2 and the wall 1, and there is no need to set up the base 2 formwork separately. The grouting process in the surrounding rock is also very simple, which can reduce the amount of construction work and improve the construction efficiency. Therefore, the second method of grouting the base 2 in the unexcavated surrounding rock at the bottom of the tunnel to form the base 2 can be regarded as the preferred option.

[0034] In this embodiment, multiple steel mesh 3 are embedded in the wall 1; in order to improve the strength of the grout-stopping wall to withstand the high-pressure grout injected during the curtain grouting operation, steel mesh 3 needs to be installed between the formwork and the working face 6 before pouring.

[0035] Optionally, the reinforcing mesh 3 includes transverse mesh 31 and longitudinal mesh 32, which are arranged intersectingly. As shown in the figure, the transverse mesh 31 is horizontally arranged, and the longitudinal mesh 32 is vertically arranged. Multiple layers of transverse mesh 31 and multiple layers of longitudinal mesh 32 can be arranged on horizontal planes at different heights, which can keep the mechanical properties of the wall 1 of the grout-stopping wall balanced at various positions. During the installation of the mesh, the longitudinal mesh 32 can be driven downward into the base 2 for anchoring, and then the transverse mesh 31 can be welded to the longitudinal mesh 32, or the transverse mesh 31 and longitudinal mesh 32 can be tied and fixed by binding. Finally, the transverse mesh 31 and longitudinal mesh 32 are combined to form the overall structure of the reinforcing mesh 3. Both the transverse mesh 31 and the longitudinal mesh 32 are fixed by binding or welding multiple steel bars. Of course, the setting direction of the mesh can be selected according to actual needs, and it can also be set to non-transverse or non-longitudinal, such as diagonal, etc. This utility model does not make specific limitations in this regard.

[0036] In this embodiment, multiple anchor rods 4 are connected between the wall 1 and the circumferential wall of the tunnel. To strengthen the bonding strength between the wall 1 and the circumferential wall of the tunnel and further alleviate the tendency of the wall 1 to sink, anchor rods 4 can be pre-embedded between the wall 1 and the circumferential wall of the tunnel. The pre-embedded positions of the anchor rods 4 can be at the tunnel arch, on the side wall of the tunnel, or both at the arch and the side wall.

[0037] In this embodiment, multiple anchor bolts 4 are arranged circumferentially along the tunnel wall. One end of each anchor bolt 4 is anchored in the circumferential wall of the tunnel, and the other end is anchored in the wall 1. Arranging multiple anchor bolts 4 in the circumferential wall of the tunnel, that is, pre-embedding them simultaneously in the side walls and the arch of the tunnel, and embedding both ends of each anchor bolt 4 into the tunnel wall and the wall 1 respectively, can maximize the anchoring effect between the wall 1 and the tunnel wall. Of course, the anchor bolts 4 can also be arranged as follows... Figure 1 As shown, the anchor rods are arranged along the length of the tunnel, i.e., the thickness direction of the wall 1. This utility model does not specifically limit the arrangement direction of the anchor rods 4.

[0038] In this embodiment, a working platform 5 is provided above the base 2 and is connected to the wall 1. The working platform 5 can be constructed in front of the grout-stopping wall so that the base 2 is embedded in the working platform 5. The working platform 5 can be formed by spraying concrete above the base 2 or by setting up formwork and pouring concrete. The working platform 5 can be used to support grouting equipment, excavators and other operating machinery and personnel.

[0039] Optionally, a ramp 51 is formed on the side of the working platform 5 away from the wall 1. Since the working platform 5 formed during construction is higher than the base 2 and also higher than the bottom of the tunnel, a ramp 51 can be set on one side of the working platform 5 to facilitate the access of grouting equipment, excavators and other working machinery and personnel. The ramp 51 can be formed by erecting a corresponding template and casting it together with the working platform 5 to form an integrated structure, or it can be formed separately by setting up a steel structure panel, etc. The present invention does not specifically limit the setting method of the ramp 51.

[0040] Alternatively, the work platform 5 extends from above the base 2 in a direction away from the wall 1 to above the bottom surface of the tunnel. In order to make the work platform 5 form a sufficient area for personnel and equipment to park, the work platform 5 can be extended from the base 2 to the bottom surface of the tunnel. The specific extension dimension of the work platform 5 can be determined according to the area occupied by the equipment and personnel to be parked. This utility model does not specifically limit the extension distance of the work platform 5, that is, the dimension of the work platform 5 in the tunnel length direction.

[0041] Optionally, an accelerator can be added to the concrete used for pouring wall 1. To shorten the construction period, improve construction efficiency, and enable the concrete of the grout-stopping wall to reach the structural load-bearing requirements earlier, an accelerator can be added to the concrete of wall 1. This allows the concrete to reach its critical strength earlier, shortening the period of covering for insulation or wet curing and reducing curing costs. The accelerator can also indirectly improve the long-term durability of the concrete, enabling rapid development of early strength, reducing the risk of plastic shrinkage cracks, and decreasing the likelihood of moisture evaporation and external erosion. In addition, the accelerator allows the concrete to form a strong structure in a timely manner at low temperatures, avoiding freeze-thaw damage.

[0042] Commonly used early strength agents include inorganic salts (such as sodium sulfate, calcium chloride, etc.), organic compounds (such as triethanolamine, calcium formate, etc.), and composite types combining inorganic and organic components.

[0043] In summary, this utility model provides a grout-stopping wall for tunnels traversing debris flow deposits. By adding a base structure at the bottom of the grout-stopping wall, the contact area between the bottom of the wall and the underlying strata is increased, reducing the pressure exerted by the wall on the strata. Combined with the connection between the grout-stopping wall and the tunnel face and circumferential wall, it can alleviate the subsidence of the grout-stopping wall under construction conditions in soft underlying strata. The base can be cast integrally with the wall using concrete, or a portion of the underlying surrounding rock can be left unexcavated during tunnel excavation, and grout can be injected into this retained rock to form the base structure. The grout-stopping wall structure is then constructed on top of the base structure. The base structures formed by these various methods all possess sufficient rigidity and hardness, and simultaneously create a sufficiently large stress-bearing area with the underlying strata, maintaining the stability of the grout-stopping wall during curtain grouting operations, thus ensuring construction quality and safety.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grout-stopping wall for tunnels traversing debris flow deposits, characterized in that, It includes a wall (1) and a base (2). One side of the wall (1) is attached to the tunnel face (6), and the outer periphery of the wall (1) is attached to the circumferential wall of the tunnel. The base (2) is located at the bottom of the wall (1) and sits on the stratum below the tunnel. The contact area between the base (2) and the bottom surface of the tunnel is greater than the bottom surface area of ​​the wall (1).

2. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 1, characterized in that, The base (2) includes the unexcavated surrounding rock at the bottom of the tunnel and the grout injected into the unexcavated surrounding rock.

3. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 1, characterized in that, Several steel meshes (3) are embedded in the wall (1).

4. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 3, characterized in that, The steel mesh (3) includes a transverse mesh (31) and a longitudinal mesh (32), which are arranged to cross each other.

5. The tunnel grout-stopping wall traversing debris flow deposits according to claim 1, characterized in that, Several anchor bolts (4) are connected between the wall (1) and the circumferential wall of the tunnel.

6. The tunnel grout-stopping wall traversing debris flow deposits according to claim 5, characterized in that, Several anchor rods (4) are arranged circumferentially along the wall of the tunnel, with one end of the anchor rod (4) anchored in the circumferential wall of the tunnel and the other end of the anchor rod (4) anchored in the wall (1).

7. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 1, characterized in that, A working platform (5) is provided above the base (2), and the working platform (5) is connected to the wall (1).

8. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 7, characterized in that, The working platform (5) has a slope (51) on the side away from the wall (1).

9. The tunnel grout-stopping wall for traversing debris flow deposits according to claim 7, characterized in that, The work platform (5) extends from above the base (2) in a direction away from the wall (1) to above the bottom surface of the tunnel.

10. The tunnel grout-stopping wall traversing debris flow deposits according to any one of claims 1 to 9, characterized in that, An early-strength agent was added to the concrete used to pour the wall (1).

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