A wedge-type sealing device for longitudinal construction joints of tunnel lining and construction method thereof

Abstract

The present invention provides a wedge-type sealing device for a longitudinal construction joint of a tunnel lining and a construction method thereof. The wedge-type sealing device comprises a longitudinal chamfer and a rubber strip. The longitudinal chamfer is arranged on the top of both sides of an invert along the longitudinal direction of the tunnel. The rubber strip is arranged on the lower part of both sides of a trolley side form along the longitudinal direction of the tunnel. The rubber strip is at least partially embedded in the longitudinal chamfer. The construction method comprises the following steps: installing an invert curved wall formwork, and installing a side form chamfer on the invert curved wall formwork along the longitudinal direction of the tunnel; pouring concrete to form an invert, and forming a longitudinal chamfer on the invert at the same time; installing a secondary lining trolley, and arranging a rubber strip on the trolley side formwork of the secondary lining trolley; overlapping the trolley side formwork with the invert through the secondary lining trolley, so that the rubber strip is at least partially embedded in the longitudinal chamfer; pouring concrete to form a secondary lining. The present invention can ensure that there is no slurry leakage during the pouring process of the secondary lining, which is beneficial to improving the overall density and strength of the secondary lining and ensuring the safety of tunnel construction.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel lining construction, in particular to a wedge-type sealing device for a longitudinal construction joint of a tunnel lining and a construction method thereof. Background Art

[0002] In the construction of the secondary lining of the tunnel, the traditional method is to construct the tunnel invert (including the curved low side wall) first, then construct the invert filling, and finally construct the secondary lining.

[0003] At present, the invert arch and filling construction of the tunnel generally adopts the invert arch arc-shaped steel formwork for casting construction, and the secondary lining is cast through the trolley side formwork of the fully hydraulic secondary lining trolley. After the invert arch casting construction is completed, the trolley side formwork and the invert arch are overlapped by the fully hydraulic secondary lining trolley. Affected by the installation accuracy and measurement error of the previous invert arch formwork, longitudinal construction joints will be generated at the left and right overlaps of the trolley side formwork and the invert arch. During the pouring of the secondary lining concrete, the cement slurry of the concrete will flow out from the longitudinal construction joint, especially when the insertion type is used for concrete pouring, the cement slurry will flow out in large quantities, which will affect the strength of the concrete in the area above the longitudinal construction joint, resulting in insufficient strength of the secondary lining.

[0004] Tunnel engineering is a permanent transportation construction project. The strength of the secondary lining directly affects the durability and safety of the later railway or highway operation. In the existing technology, most of them use cotton cloth or other materials to fill the longitudinal construction joint to prevent the outflow of cement slurry. However, the blocking effect of this method is relatively poor, and the filling and removal operations are also inconvenient, which greatly affects the construction efficiency. Summary of the invention

[0005] The first object of the present invention is to provide a wedge-type sealing device for a longitudinal construction joint of a tunnel lining.

[0006] The second object of the present invention is to provide a construction method for a wedge-type sealing device for a longitudinal construction joint of a tunnel lining.

[0007] In order to achieve the above-mentioned first purpose, the present invention provides a wedge-type sealing device for a longitudinal construction joint of a tunnel lining, comprising a longitudinal chamfer and a rubber strip, wherein the longitudinal chamfer is arranged on the top of both sides of the invert along the longitudinal direction of the tunnel, and the rubber strip is arranged on the lower part of both sides of the trolley side mold along the longitudinal direction of the tunnel, and the rubber strip is at least partially embedded in the longitudinal chamfer.

[0008] It can be seen from the above scheme that by providing a rubber strip on the trolley side formwork and setting a longitudinal chamfer on the invert, the rubber strip is at least partially embedded in the longitudinal chamfer, which can ensure that there is no leakage of slurry during the pouring of the secondary lining, which is beneficial to improving the overall density and strength of the secondary lining and ensuring the safety of tunnel construction.

[0009] A further solution is that the lower part of the trolley side form overlaps with the upper part of the invert to form a building area, the rubber strip is at least partially arranged in the overlapping area, and the longitudinal chamfer is at least partially arranged in the overlapping area.

[0010] A further solution is that the cross-section of the rubber strip includes a first connecting part, a second connecting part and a raised part, and the first connecting part and the second connecting part are arranged on the upper and lower sides of the raised part; the first connecting part and the second connecting part are respectively provided with multiple connecting parts, and the rubber strip is connected to the trolley side mold through the multiple connecting parts.

[0011] A further solution is that the cross-section of the protrusion is in the shape of a triangle.

[0012] A further solution is that the rubber strip is made of rubber material.

[0013] In order to achieve the above-mentioned second purpose, the present invention provides a construction method of a wedge-type sealing device for a longitudinal construction joint of a tunnel lining, comprising the following steps: installing an inverted arch curved wall formwork, and installing a side form chamfer on the inverted arch curved wall formwork along the longitudinal direction of the tunnel; pouring concrete to form an inverted arch, and simultaneously forming a longitudinal chamfer on the top of the inverted arch; installing a secondary lining trolley, and providing a rubber strip on the trolley side formwork of the secondary lining trolley; overlapping the trolley side formwork and the inverted arch through the secondary lining trolley, so that the rubber strip is at least partially embedded in the longitudinal chamfer; pouring concrete to form a secondary lining.

[0014] It can be seen from the above scheme that by forming a longitudinal chamfer when pouring the inverted arch, and by arranging a rubber strip on the side form of the trolley, when the side form of the trolley and the inverted arch overlap, the rubber strip is matched and connected with the longitudinal chamfer. During the pouring process, the concrete and the rubber strip are tightly fitted, which can not only effectively prevent leakage of slurry, but also has the characteristics of simple and convenient operation compared with the existing technology.

[0015] A further solution is that the construction method also includes the following steps: after the second lining meets the demolding requirements, the trolley side formwork is removed, and a longitudinal V-shaped groove is formed at the connection between the back arch and the second lining; the ditch cable trough formwork is installed; concrete is poured in the ditch cable trough formwork and the longitudinal V-shaped groove to form a ditch cable trough platform.

[0016] A further solution is that after the trolley side formwork is overlapped with the invert arch, the second lining trolley reinforces the trolley side formwork.

[0017] A further solution is that the cross section of the rubber strip includes a first connecting portion, a second connecting portion and a raised portion, the first connecting portion and the second connecting portion are arranged on upper and lower sides of the raised portion, and the cross section of the raised portion is a triangle.

[0018] A further solution is that the rubber strip is made of rubber material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic cross-sectional view of a tunnel during the second lining construction process of the tunnel according to an embodiment of the present invention.

[0020] Figure 2 It is a partial enlarged view of point A of an embodiment of the present invention.

[0021] Figure 3 It is a flow chart of the construction method of an embodiment of the present invention.

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0023] See also Figures 1 to 2 , Figure 1 is a schematic cross-sectional view of a tunnel during the second lining construction process of an embodiment of the present invention, Figure 2 It is a partial enlarged view of point A of an embodiment of the present invention. The wedge-type sealing device of the longitudinal construction joint of the tunnel lining includes a longitudinal chamfer 11 and a rubber strip 3. The longitudinal chamfer 11 is arranged on the top of the left and right sides of the invert 1 along the longitudinal direction of the tunnel, and intersects with the top surface 12 of the short side wall of the invert 1. The rubber strip 3 is arranged at the lower part of the left and right sides of the trolley side mold 2 along the longitudinal direction of the tunnel, and protrudes outward along the side surface facing the invert 1. The rubber strip 3 is at least partially embedded in the longitudinal chamfer 11. In the embodiment of the present invention, preferably, a part of the rubber strip 3 is embedded in the longitudinal chamfer 11, and the other part protrudes from the longitudinal chamfer 11.

[0024] The trolley side formwork 2 is arranged on the secondary lining trolley 4 and is arranged in an arc structure along the tunnel circumferential direction. The trolley side formwork 2 includes two free ends arranged at the bottom, and the two free ends overlap the left and right ends of the inverted arch 1 respectively to form a construction area. The rubber strip 3 is at least partially arranged in the overlapping area, and the longitudinal chamfer 11 is at least partially arranged in the overlapping area. When the rubber strip 3 is partially embedded in the longitudinal chamfer 11, the upper part of the rubber strip 3 protrudes from the top surface 12 of the short side wall of the inverted arch 1 to ensure that the gap between the inverted arch 1 and the trolley side formwork 2 is completely filled by the rubber strip 3 to avoid leakage when pouring concrete. Specifically, the cross section of the rubber strip 3 includes a first connecting portion 31, a second connecting portion 32 and a protruding portion 33, and the first connecting portion 31 and the second connecting portion 32 are respectively arranged on the upper and lower sides of the protruding portion 33. A plurality of first mounting holes are respectively provided on the first connection part 31 and the second connection part 32, and the plurality of first mounting holes are arranged in the longitudinal direction of the tunnel; a plurality of second mounting holes are respectively provided on the left and right sides of the trolley side form 2, and the plurality of second mounting holes are arranged one by one in correspondence with the first mounting holes. The rubber strip 3 is detachably connected to the trolley side form 2 through a connecting piece that sequentially passes through the first mounting hole and the second mounting hole. The connecting piece is preferably a screw. The nut of the screw is preferably flush with the surface of the first connection part 31 or the second connection part 32. The cross-sectional shape of the raised part 33 is a triangle, preferably an isosceles triangle. When the rubber strip 3 is connected to the longitudinal chamfer 11, the vertex of the isosceles triangle intersects with the top surface 12 of the short side wall of the invert 1. The rubber strip 3 is made of rubber material. When the second lining 5 is poured, the rubber strip 3 is tightly fitted with the longitudinal chamfer 11 under the pressure of the concrete, which is conducive to improving the sealing effect and preventing leakage.

[0025] See also Figure 3 As shown, Figure 3 1 is a flow chart of a construction method of an embodiment of the present invention. The construction method of the wedge-type sealing device comprises the following steps:

[0026] In step S1, an inverted arch curved wall formwork is installed, and a side form chamfer is installed on the inverted arch curved wall formwork. The side form chamfer is arranged on a side surface of the inverted arch curved wall formwork facing the inverted arch along the longitudinal direction of the tunnel. The cross section of the side form chamfer is a triangle, preferably an obtuse triangle. One side of the obtuse angle in the obtuse triangle is closely fitted with the surface of the inverted arch curved wall formwork. The other side of the obtuse angle in the obtuse triangle is flush with the upper surface of the inverted arch curved wall formwork, so that after the inverted arch is cast and formed, the top surface of the short side wall of the inverted arch is flush with the upper surface of the side form chamfer. The width of one side of the obtuse triangle flush with the upper surface of the inverted arch curved wall formwork is preferably greater than 5 cm.

[0027] Then, step S2 is performed to pour concrete on the inverted arch curved wall formwork to form the inverted arch, and at the same time, a longitudinal chamfer is formed on the inverted arch by chamfering the side formwork installed on the inverted arch curved wall formwork. The longitudinal chamfer is arranged on the top of the left and right sides of the inverted arch along the longitudinal direction of the tunnel and intersects with the top surface of the short side wall of the inverted arch.

[0028] In step S3, a secondary lining trolley is installed, and a rubber strip is arranged on the trolley side mold of the secondary lining trolley, and the rubber strip is made of rubber material. The rubber strip is arranged at the lower part of the left and right sides of the trolley side mold along the longitudinal direction of the tunnel, and protrudes outward along the side surface facing the invert arch. The cross section of the rubber strip includes a first connecting portion, a second connecting portion and a protruding portion, and the first connecting portion and the second connecting portion are arranged on the upper and lower sides of the protruding portion. The first connecting portion and the second connecting portion are used for detachable connection with the trolley side mold. The cross section of the protruding portion is a triangle, preferably an isosceles triangle.

[0029] Then, step S4 is performed, and the side form of the trolley is overlapped with the inverted arch by the second lining trolley, so that the rubber strip is at least partially embedded in the longitudinal chamfer. When the side form of the trolley is overlapped with the inverted arch, the second lining trolley can be used to measure, calibrate and position, and the side form of the trolley is reinforced by the hydraulic system so that the rubber strip is closely fitted with the longitudinal chamfer. At this time, the first connecting portion of the rubber strip is closely fitted with the inner surface of the inverted arch, the lower surface of the raised portion of the rubber strip is closely fitted with the longitudinal chamfered surface, and the upper surface of the raised portion of the rubber strip and the second connecting portion are both placed above the top surface of the short side wall of the inverted arch.

[0030] Then, step S5 is performed to pour concrete to form the second lining. After the side form of the trolley is reinforced, the pouring construction of the lining concrete can be carried out. It is preferred to pour the concrete symmetrically from the bottom to the top of the short side walls on the left and right sides of the inverted arch, so that during the pouring process, the concrete itself exerts a downward compression effect on the rubber strip, further improving the sealing effect of the rubber strip at the longitudinal construction joint.

[0031] The construction method also includes the following steps:

[0032] After the secondary lining meets the requirements for demoulding, the side formwork of the trolley is removed, and a longitudinal V-shaped groove is formed at the connection between the invert and the secondary lining; one side wall of the longitudinal V-shaped groove is the longitudinal chamfer of the invert.

[0033] Install trench cable trough templates;

[0034] Concrete is poured in the water ditch cable trough template and in the longitudinal V-shaped groove to form a water ditch cable trough platform. The water ditch cable trough platform completely covers the longitudinal V-shaped groove.

Claims

1. A construction method for a wedge-type sealing device for a longitudinal construction joint of a tunnel lining, characterized in that: The following steps are involved: Installing an inverted arch curved wall formwork, and installing side form chamfers on the inverted arch curved wall formwork along the longitudinal direction of the tunnel; pouring concrete to form an inverted arch, and simultaneously forming a longitudinal chamfer on the inverted arch; Install a secondary lining trolley, and set a rubber strip on the trolley side mold of the secondary lining trolley, the cross section of the rubber strip includes a first connecting portion, a second connecting portion and a raised portion, the first connecting portion and the second connecting portion are arranged on the upper and lower sides of the raised portion, and the cross section of the raised portion is a triangle; The side form of the trolley is overlapped with the invert arch by a secondary lining trolley, so that the rubber strip is at least partially embedded in the longitudinal chamfer; pouring concrete to form the secondary lining; After the second lining meets the requirements for demoulding, the side mold of the trolley is removed, and a longitudinal V-shaped groove is formed at the connection between the invert and the second lining; Install trench cable trough templates; Pour concrete inside the ditch cable trough template and the longitudinal V-shaped groove to form a ditch cable trough platform.

2. The construction method according to claim 1, characterized in that: After the trolley side formwork is overlapped with the invert arch, the second lining trolley reinforces the trolley side formwork.

3. The construction method according to claim 2, characterized in that: The rubber strip is made of rubber material.

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