A v-shaped seam forming device

Abstract

The utility model relates to tunnel second lining construction technical field discloses a V type joint forming device, including triangular rubber strip and fastening screw, fastening screw can fasten triangular rubber strip on the half triangular slope of having already poured second lining, V type joint forming device includes the backing plate, the backing plate is used for the backing between the cap nut of fastening screw and triangular rubber strip, and still be equipped with the recess structure of accommodating the cap nut of fastening screw on the backing plate, be provided with in recess structure and incline portion, incline portion can be perpendicular with the axis direction of fastening screw. The V type joint forming device of the utility model can conveniently pull up fastening screw, convenient operation, effectively improve the service life of rubber strip.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and more specifically, to a V-shaped joint forming device. Background Technology

[0002] The traditional method of forming a "V" shaped joint involves cutting the joint with a cutting machine and then grinding it with an angle grinder after the secondary lining is poured. However, this method is costly, has poor alignment control, and results in poor appearance quality. Furthermore, cutting the joint above the arch wall is a high-altitude operation, with limited lighting and poor air quality inside the tunnel, posing significant safety risks and occupational health hazards.

[0003] To address the aforementioned problems, a triangular piece is installed around the entire circumference of the end of the secondary lining trolley panel in the forward direction. When pouring the next slab of secondary lining concrete, the circumferential triangular piece at the end of the lining trolley template creates a half-V-shaped groove. During the construction of the next lining slab, a triangular rubber strip is pre-embedded at the circumferential construction joint and secured with cement nails. After molding, the template and rubber strip are removed, forming the V-shaped groove of the construction joint.

[0004] However, during the disassembly process, the cement nails are driven into the rubber strip, and the nuts are embedded in the rubber strip, making it difficult to remove the cement nails. Usually, the cement nails are removed by directly pulling the rubber strip, which causes serious damage to the rubber strip and reduces its service life. Utility Model Content

[0005] This invention addresses the problem of difficult disassembly of cement nails in existing technologies by providing a V-shaped seam forming device, which makes it easier to disassemble cement nails and thus effectively improves the service life of rubber strips.

[0006] This utility model is achieved through the following technical solution:

[0007] A V-shaped seam forming device includes a triangular rubber strip and a fastening screw. The fastening screw can fasten the triangular rubber strip to a semi-triangular inclined surface of a cast secondary lining. The V-shaped seam forming device includes a pad, which is used to place between the nut of the fastening screw and the triangular rubber strip. The pad is also provided with a groove structure to accommodate the nut of the fastening screw. The groove structure is provided with an inclined portion, which can be perpendicular to the axial direction of the fastening screw.

[0008] Optionally, the cross-section of the groove structure is a right-angled triangle, and it is formed by rotating and cutting around an axis.

[0009] Optionally, the cross-section of the groove structure is a right-angled triangle, and it is cut out along a straight line.

[0010] Optionally, it also includes a collar, which is fitted onto the fastening screw, and one end of the collar is provided with an annular protrusion, which can maintain a gap between the nut of the fastening screw and the washer.

[0011] Optionally, the outer periphery of the cross-section of the annular protrusion is arc-shaped.

[0012] Optionally, the pad is a steel plate.

[0013] Optionally, the pad has a circular or square cross-section.

[0014] Optionally, the thickness of the pad is 5mm-8mm.

[0015] The technical solution of this utility model has at least the following beneficial effects:

[0016] The V-shaped seam forming device of this utility model, by setting a pad, can prevent the nut of the fastening screw from being embedded in the rubber strip, making it easy to disassemble. On the other hand, it can also provide a support for the reaction force of the disassembly tool when disassembling the fastening screw. The pad has a groove structure, which can accommodate the screw nut and reduce the size of the screw nut protruding. The inclined part in the groove structure can well adapt to the inclined fastening screw. Attached Figure Description

[0017] Figure 1 A cross-sectional view showing the positional arrangement of the V-shaped seam forming device of this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of part A;

[0019] Figure 3 This is a cross-sectional view of the collar of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the pad of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the pad according to another embodiment of the present invention;

[0022] Figure label:

[0023] 1-Triangular rubber strip, 2-Fasting screw, 3-Washer plate, 4-Groove structure, 41-Inclined part, 5-Loop, 51-Annular protrusion. Detailed Implementation

[0024] Reference Figures 1-5The V-shaped joint forming device of this utility model includes a triangular rubber strip 1 and a fastening screw 2. The fastening screw 2 is made of cement steel nail and can fasten the triangular rubber strip 1 to the semi-triangular inclined surface of the poured secondary lining. During construction, a triangular piece with a height of 5cm and a base width of 3cm is installed around the end of the secondary lining trolley panel in the forward direction to reserve the semi-triangle at the forward end. When constructing the next plate of secondary lining, the triangular rubber strip 1 (base width 60mm, height 50mm) is pre-embedded at the circumferential construction joint. The triangular rubber strip 1 is fixed to the poured lining concrete with cement steel nails with a length of 5cm. After demolding, the triangular rubber strip is removed to form the "V" shaped groove of the construction joint.

[0025] The V-shaped seam forming device of this utility model includes a pad 3, which is used to place between the nut of the fastening screw 2 and the triangular rubber strip 1. The pad 3 also has a groove structure 4 for accommodating the nut of the fastening screw 2. The groove structure 4 has an inclined part 41, which is perpendicular to the axis of the fastening screw 2. By providing the pad 3, on the one hand, the nut of the fastening screw 2 can be prevented from being embedded in the rubber strip, making disassembly convenient; on the other hand, it provides a support for the reaction force of the disassembly tool when disassembling the fastening screw 2. Disassembly is simple and convenient; it can be disassembled by simply using a claw hammer to turn it upside down and apply force. The groove structure 4 on the pad 3 can accommodate the screw nut and reduce the size of the protruding screw nut. Since the rigid pad 3 structure is used, the screw nut will protrude slightly. In order not to affect the forming, the groove structure 4 is used to greatly reduce the protruding size. The inclined part 41 in the groove structure 4 can be well adapted to the inclined fastening screw 2.

[0026] The pad 3 is made of steel plate, and has a circular or square cross-section. The thickness of the pad 3 is 5mm-8mm. After tightening the screw 2, the pad 3 can be embedded into the triangular rubber strip 1, thus preventing it from protruding.

[0027] The groove structure 4 can be formed by cutting a right-angled triangle with a cross-section around an axis; or it can be formed by cutting a right-angled triangle with a cross-section around a straight line. The straight-line cutting method can form a groove with a larger space. When disassembling the fastening screw 2, the claw hammer can cut in along the straight line and easily insert under the nut to pull out the fastening screw 2.

[0028] To further facilitate the removal of the fastening screw 2, the V-shaped slit forming device of this utility model also includes a collar 5. The collar 5 is fitted onto the fastening screw 2, and one end of the collar 5 is provided with an annular protrusion 51. The annular protrusion 51 can maintain a gap between the nut of the fastening screw 2 and the washer 3. The outer periphery of the cross-section of the annular protrusion 51 is arc-shaped. By fitting the collar 5 onto the fastening screw 2, a certain gap exists between the nut and the washer 3 after tightening. Although this gap increases the protrusion of the screw to some extent, this protrusion can be overcome by increasing the thickness of the washer 3 and increasing the depth of the groove structure 4, but it facilitates the removal of the fastening screw 2.

Claims

1. A V-shaped joint forming apparatus comprising a triangular rubber strip and a fastening screw capable of fastening the triangular rubber strip on a half-triangular slope of a casted secondary lining, characterized in that, The V-shaped seam forming device includes a pad plate, which is used to place between the nut of the fastening screw and the triangular rubber strip. The pad plate is also provided with a groove structure to accommodate the nut of the fastening screw. The groove structure is provided with an inclined part, which can be perpendicular to the axial direction of the fastening screw.

2. The V-slit forming device of claim 1, wherein The groove structure has a right-angled triangle cross-section and is formed by rotating and cutting around an axis.

3. The V-slit forming device of claim 1, wherein The groove structure has a right-angled triangle cross-section and is cut out along a straight line.

4. The V-slit forming device of claim 1, wherein It also includes a collar, which is fitted onto the fastening screw, and one end of the collar is provided with an annular protrusion, which can maintain a gap between the nut of the fastening screw and the washer.

5. The V-slit forming device of claim 4, wherein The outer periphery of the cross-section of the annular protrusion is arc-shaped.

6. The V-slit forming device of claim 1, wherein The pad is made of steel plate.

7. The V-slit forming device of claim 1, wherein The pad has a circular or square cross-section.

8. The V-slit forming device of claim 1, wherein The thickness of the pad is 5mm-8mm.

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