A corner support device for arched formwork of secondary lining in a mined tunnel

Abstract

This utility model discloses a corner support device for the arched formwork of the secondary lining of a mined tunnel, comprising: an upper support component including a U-shaped top support with a screw rod below it and an adjustable support rod rotatably mounted on the screw rod; a lower support component including a diagonal support rod, which is tubular, with its upper end set as a horizontal plane and its lower end set as a slope; and a vertical connecting fastener with a vertical rod inside. The adjustable support rod of this utility model is rotatably mounted on the screw rod through its internal threaded connecting part, achieving precise adjustment of the support height, adapting to the construction needs of different arch heights, and reducing the risk and difficulty of repeated high-altitude adjustments.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, specifically to a corner support device for the arched formwork of the secondary lining of a mined tunnel. Background Technology

[0002] In the construction of mined tunnels, the installation of arched formwork for secondary lining is a crucial step in ensuring the stability and quality of the tunnel structure. Due to the variable curvature of tunnel arches, traditional disc-locking support frames are significantly inadequate for corner support. Currently, the common practice is to use steel pipe couplers to diagonally lock onto the uprights for slanted top support. However, this method has revealed several problems in practical application: First, the diagonal steel pipes need to be cross-locked onto the uprights, severely encroaching on the working space below the tunnel and affecting material transportation and excavation efficiency. Second, the installation process requires repeated adjustments to the angle of the diagonal bracing, necessitating multiple operations at height, which is not only labor-intensive but also poses high safety risks. Furthermore, the inconvenience of operation leads to insecure locking, making it difficult to guarantee support stability. In addition, traditional steel pipe diagonal bracing is ill-suited to situations with significant variations in tunnel arch curvature, easily interfering with the crossbars, causing uneven distribution of support force at the corners of the formwork, and even leading to localized stress concentration, resulting in formwork deformation, misalignment of the concrete surface, and other quality problems. Utility Model Content

[0003] The purpose of this utility model is to provide a corner support device for the arched formwork of the secondary lining of a mined tunnel, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides a corner support device for the arched formwork of the secondary lining of a mined tunnel, comprising: an upper support member including a U-shaped top support, a screw rod disposed below the U-shaped top support, and an adjusting support rod rotatably disposed on the screw rod; a lower support member including an inclined support rod, the inclined support rod being tubular, the upper end of the inclined support rod being set as a horizontal plane, and the lower end of the inclined support rod being set as an inclined plane; and a vertical connecting fastener, wherein a vertical rod is disposed within the vertical connecting fastener, comprising a first arc-shaped steel plate and a second arc-shaped steel plate, two first pin holes are disposed above the first arc-shaped steel plate, two second pin holes are disposed above the second arc-shaped steel plate, and connecting pins are inserted into the first pin holes and the second pin holes, and the first arc-shaped steel plate and the second arc-shaped steel plate are fixedly connected below.

[0005] In a preferred embodiment, two third pin holes are spaced apart below the first arc-shaped steel plate, and two fourth pin holes corresponding to the third pin holes are spaced apart below the second arc-shaped steel plate. Fastening bolts are respectively inserted into the two sets of third pin holes and fourth pin holes, and fastening nuts are provided on the fastening bolts. The first arc-shaped steel plate and the second arc-shaped steel plate are fixedly connected below by fastening bolts and fastening nuts.

[0006] In a preferred embodiment, diagonal bracing rods are provided between the U-shaped top support and the screw rod in all four directions.

[0007] In a preferred embodiment, the adjusting support rod includes a connecting part with a thread inside. The connecting part is rotatably mounted on a screw. Support rods are horizontally arranged on both sides of the connecting part, and the outer sides of both support rods extend outward from the outer side of the inclined support rod.

[0008] In a preferred embodiment, the inclined surface of the lower end of the inclined support rod is set as an arc-shaped surface.

[0009] In a preferred embodiment, two first pin holes are spaced apart, and two second pin holes are spaced apart. The first pin hole is located at the front, and a second pin hole is located behind the frontmost first pin hole. A second first pin hole is located behind the second pin hole located behind the first pin hole, and a second second pin hole is located at the rear.

[0010] In a preferred embodiment, a leather gasket is provided on the inner side of the first arc-shaped steel plate and the second arc-shaped steel plate.

[0011] In a preferred embodiment, a secondary arched template is provided at the top of the U-shaped top support, the U-shaped top support is in contact with the secondary arched template, and a template support keel is provided between the U-shaped top support and the secondary arched template.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The adjustable support rod of this utility model is rotatably mounted on the screw rod through its internal threaded connecting part, which realizes precise adjustment of the support height, adapts to the construction needs of different arch heights, and reduces the risk and difficulty of repeated high-altitude adjustment operations.

[0014] 2. This utility model uses a U-shaped top support to connect with the arched template of the secondary lining, and sets a template support keel between the two to effectively transfer the upper load, enhance the uniformity of the load bearing at the corner of the template, and avoid local deformation.

[0015] 3. The inclined support rod adopts a tubular structure with a horizontal upper opening and an inclined arc lower opening, which makes it fully contact the outer surface of the vertical connecting fastener, significantly improving the stability of the support. The vertical connecting fastener is fastened to the upright through the first and second arc steel plates and fixed by connecting pins, fastening bolts and fastening nuts, realizing a quick and reliable connection with the upright, greatly improving installation efficiency and ensuring the strength of the joint. Attached Figure Description

[0016] Figure 1 This is a front view of the vertical connecting fastener of this utility model;

[0017] Figure 2This is a side view of the vertical connecting fastener of this utility model;

[0018] Figure 3 This is a schematic diagram showing the connection between the upper support member and the lower support member of this utility model;

[0019] Figure 4 This is a schematic diagram of the lower support component of this utility model;

[0020] Figure 5 This is a schematic diagram of the upper support component of this utility model;

[0021] Figure 6 This is a schematic diagram of the overall design of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1-U-shaped top support, 2-screw, 3-adjusting support rod, 4-diagonal support rod, 5-first arc-shaped steel plate, 6-second arc-shaped steel plate, 7-upright pole, 8-connecting pin, 9-fastening bolt, 10-fastening nut, 11-diagonal brace, 12-connecting part, 13-support rod, 14-leather washer, 15-secondary lining arch template, 16-template support keel. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Example 1:

[0025] like Figure 1 As shown in the figure, the present invention provides a corner support device for the arched formwork of the secondary lining of a mined tunnel, comprising: an upper support member, the upper support member including a U-shaped top support 1, the top of the U-shaped top support 1 being provided with a secondary lining arched formwork 15, the U-shaped top support 1 being in contact with the secondary lining arched formwork 15, and a formwork support keel 16 being provided between the U-shaped top support 1 and the secondary lining arched formwork 15.

[0026] A screw rod 2 is provided below the U-shaped top support 1. Diagonal bracing rods 11 are provided between the U-shaped top support 1 and the screw rod 2 in all four directions. An adjusting support rod 3 is rotatably provided on the screw rod 2. The adjusting support rod 3 includes a connecting part 12. The connecting part 12 is threaded inside and is rotatably provided on the screw rod 2. Support rods 13 are horizontally provided on both sides of the connecting part 12. The outer sides of the two support rods 13 extend outwards to the outer side of the diagonal support rod 4.

[0027] The lower support component includes a diagonal support rod 4, which is tubular. The upper end of the diagonal support rod 4 is set as a horizontal plane, and the lower opening of the diagonal support rod 4 is set as a slope. The slope of the lower opening of the diagonal support rod 4 is set as an arc-shaped surface.

[0028] A vertical connecting fastener is provided, with a vertical post 7 inside. The vertical connecting fastener includes a first arc-shaped steel plate 5 and a second arc-shaped steel plate 6. A leather washer 14 is provided on the inner side of the first arc-shaped steel plate 5 and the second arc-shaped steel plate 6. Two first pin holes are provided on the upper part of the first arc-shaped steel plate 5, and two second pin holes are provided on the upper part of the second arc-shaped steel plate 6. The two first pin holes are spaced apart, and the two second pin holes are spaced apart. The first pin hole is located at the foremost position, and a second pin hole is located behind the first pin hole. A second first pin hole is located behind the second pin hole behind the first pin hole, and the second second pin hole is located at the rearmost position. A connecting pin 8 passes through the first and second pin holes.

[0029] Two third pin holes are spaced apart below the first arc-shaped steel plate 5, and two fourth pin holes corresponding to the third pin holes are spaced apart below the second arc-shaped steel plate 6. Fastening bolts 9 are respectively inserted into the two sets of third and fourth pin holes, and fastening nuts 10 are provided on the fastening bolts 9. The first arc-shaped steel plate 5 and the second arc-shaped steel plate 6 are fixedly connected below by fastening bolts 9 and fastening nuts 10. The first arc-shaped steel plate 5 and the second arc-shaped steel plate 6 are fastened to the upright 7.

[0030] Example 2:

[0031] The following describes how to use this utility model:

[0032] Step 1: Install the vertical connecting fasteners. Fasten the first arc-shaped steel plate 5 and the second arc-shaped steel plate 6 onto the upright 7, ensuring that the inner leather washer 14 is tightly against the surface of the upright 7. Then, insert the connecting pin 8 into the first pin hole and the second pin hole to initially connect the two steel plates. Next, use the fastening bolt 9 and the fastening nut 10 to insert into the lower third pin hole and the fourth pin hole and tighten them to firmly fix the first arc-shaped steel plate 5 and the second arc-shaped steel plate 6 onto the upright 7. This step achieves a quick and reliable connection with the upright 7. The leather washer 14 effectively increases the friction and prevents metal wear, ensuring the rigidity and stability of the joint.

[0033] Step 2: Assemble and adjust the lower support component. Align the upper horizontal surface of the inclined support rod 4 with the end of the installed adjusting support rod 3, and fix the arc-shaped surface of its lower opening to the upright rod 7.

[0034] Step 3: Install and precisely adjust the upper support components. Rotate the adjusting support rod 3 onto the screw rod 2 via its internal threaded connection. Adjust the height of its top end by rotating the adjusting support rod 3, so that the U-shaped top support 1 is accurately raised to the designed elevation position of the corner of the secondary lining arch template 15. Install the template support keel 16 between the U-shaped top support 1 and the secondary lining arch template 15. This step, by adjusting the threaded engagement between the support rod 3 and the screw rod 2, achieves precise and convenient adjustment of the support height, perfectly adapting to the elevation requirements of different curvatures of the arch. The cooperation between the U-shaped top support 1 and the template support keel 16 ensures uniform distribution of jacking force, greatly reducing the operational risks and labor intensity of repeated adjustments at height.

[0035] Step 4: Reinforcement and Overall Acceptance. Diagonal bracing rods 11 are installed between the U-shaped top support 1 and the screw rod 2 in four directions to further reinforce the upper structure. After all components are installed, all connection nodes are thoroughly inspected to ensure that the connecting pins 8, fastening bolts 9, and fastening nuts 10 are all tightened in place, and that the diagonal support rods 4 provide stable support. The entire corner support device is confirmed to fully meet design requirements. This step, by adding diagonal bracing rods 11, greatly enhances the overall rigidity and resistance to lateral deformation in the U-shaped top support 1 area, effectively preventing possible displacement during concrete pouring. Comprehensive acceptance ensures the safety and reliability of the entire support system.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corner support device for the arched formwork of the secondary lining of a mined tunnel, characterized in that: include: The upper support component includes a U-shaped top support (1), a screw (2) is provided below the U-shaped top support (1), and an adjusting support rod (3) is rotatably provided on the screw (2). The lower support member includes a diagonal support rod (4), which is tubular, with the upper end of the diagonal support rod (4) set as a horizontal plane and the lower end of the diagonal support rod (4) set as a slope. A vertical connecting fastener is provided inside the vertical connecting fastener, which includes a first arc-shaped steel plate (5) and a second arc-shaped steel plate (6). The first arc-shaped steel plate (5) has two first pin holes above it, and the second arc-shaped steel plate (6) has two second pin holes above it. A connecting pin (8) passes through the first pin holes and the second pin holes. The first arc-shaped steel plate (5) and the second arc-shaped steel plate (6) are fixedly connected below each other. The first arc-shaped steel plate (5) and the second arc-shaped steel plate (6) are fastened to the upright (7).

2. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 1, characterized in that: Two third pin holes are provided at intervals below the first arc-shaped steel plate (5), and two fourth pin holes corresponding to the third pin holes are provided at intervals below the second arc-shaped steel plate (6). Fastening bolts (9) are respectively inserted into the two sets of third pin holes and fourth pin holes, and fastening nuts (10) are provided on the fastening bolts (9). The first arc-shaped steel plate (5) and the second arc-shaped steel plate (6) are fixedly connected below by fastening bolts (9) and fastening nuts (10).

3. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 2, characterized in that: The U-shaped top support (1) is provided with diagonal bracing rods (11) in all four directions between it and the screw (2).

4. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 3, characterized in that: The adjusting support rod (3) includes a connecting part (12), the connecting part (12) is provided with a thread inside, the connecting part (12) is rotatably mounted on the screw (2), and support rods (13) are horizontally arranged on both sides of the connecting part (12), and the outer sides of the two support rods (13) extend outward from the outer side of the inclined support rod (4).

5. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 4, characterized in that: The inclined surface of the lower opening of the inclined support rod (4) is set as an arc surface.

6. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 5, characterized in that: Two first pin holes are spaced apart, and two second pin holes are spaced apart. The first pin hole is located at the front, and a second pin hole is located behind the frontmost first pin hole. A second first pin hole is located behind the second pin hole located behind the first pin hole, and the second second pin hole is located at the rear.

7. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 5, characterized in that: The first arc-shaped steel plate (5) and the second arc-shaped steel plate (6) are provided with leather gaskets (14).

8. The corner support device for the arched formwork of the secondary lining of a mined tunnel according to claim 5, characterized in that: The top of the U-shaped top support (1) is provided with a secondary arched template (15), the U-shaped top support (1) is in contact with the secondary arched template (15), and a template support keel (16) is provided between the U-shaped top support (1) and the secondary arched template (15).

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