Temporary supporting mechanism for tunnel steel arch

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a temporary supporting mechanism for a tunnel steel arch. The device comprises supporting plates and jacking mechanisms arranged on the supporting plates, the multiple supporting plates are arranged, a hollow frame structure is defined by the supporting plates, and supporting assemblies used for reinforcing the supporting plates are arranged between the adjacent supporting plates; the jacking mechanism comprises a first scissor rod, a second scissor rod and a displacement device, the first scissor rod and the second scissor rod are hinged to each other, the displacement device drives the first scissor rod and the second scissor rod to stretch out and draw back, the first scissor rod is hinged to the supporting plate, and a jacking plate is hinged to the first scissor rod. When the jacking mechanism of the device supports the steel arch frame, a worker can pass through the hollow frame defined by the supporting plates, and passing of the worker through a tunnel is not hindered; the jacking mechanism of the device can change the jacking height, so that the device can adapt to steel arches of different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a temporary supporting mechanism for a tunnel steel arch frame. Background Art

[0002] The steel arch frame is a circumferential steel support in the initial support of the tunnel. It is a special circumferential I-beam or other steel, and there is also a grid steel frame made of threaded steel welded together. During the tunnel construction process, the steel arch frame is the load-bearing structure of the tunnel. Its main function is to support the surrounding rock before the shotcrete takes effect, to reinforce the shotcrete, and to serve as a fulcrum for advance support. Together with anchor rods and shotcrete, it plays the role of initial support. However, since the steel arch frame generally adopts a segmented structure, when installing the steel arch frame, it relies on manual adjustment of the position and height of each segment, which makes it more difficult to hold and control it manually, and the labor intensity of the workers is high, which is easy to cause slipping and the construction risk is high.

[0003] Most of the existing temporary support installation equipment is installed using trolleys and scaffolding. Most of these tunnel support structures are fixed structures and cannot be adjusted according to the actual support height. For different support heights, support structures of different heights need to be built separately.

[0004] Chinese patent CN202322575069.4 discloses "A temporary support device for a tunnel steel arch frame", publication number CN220748290U, the device includes a fixed frame, a first support arm and two second support arms; the fixed frame is a T-shaped structure, including a vertical slide and a horizontal slide; the first support arm is arranged in the vertical slide; the two second support arms are respectively arranged at the two ends of the horizontal slide; two diagonal braces are symmetrically arranged on both sides of the first support arm, and a strip groove is arranged above the horizontal slide along the sliding direction of the second support arm, one end of the two diagonal braces is hinged on the first support arm, and the other end passes through the strip groove and extends into the horizontal slide, and is rotatably connected with the second support arm. However, the device has some defects: the device is a cross-shaped support structure, and after the device is installed in the tunnel, it will form a state of blocking the tunnel, hindering the staff from passing through the tunnel, and hindering the staff from moving equipment or tools. Utility Model Content

[0005] In order to solve the above problems of the prior art, the utility model provides a temporary support mechanism for a tunnel steel arch frame, which supports the tunnel steel arch frame without hindering workers from passing through the tunnel.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a temporary support mechanism for a tunnel steel arch frame, comprising a support plate and a lifting mechanism arranged on the support plate, wherein a plurality of support plates are arranged, and the support plates are combined to form an internal hollow frame structure, and a support assembly for reinforcing the support plates is arranged between adjacent support plates; the lifting mechanism comprises a first scissors rod and a second scissors rod hinged to each other, and a displacement device for driving the first scissors rod and the second scissors rod to extend and retract, the first scissors rod is hinged to the support plate, and the lifting plate is hinged to the first scissors rod.

[0007] With the above structural design, while the jacking mechanism supports the steel arch frame, the workers can pass through the hollow frame surrounded by the support plates without hindering the workers from passing through the tunnel.

[0008] Preferably, the support assembly includes a reinforcing plate connected to the support plate by bolts, two reinforcing plates are provided and are perpendicular to each other, and a diagonal bracing plate is provided between the reinforcing plates.

[0009] By adopting the above structural design, the support plates are connected to increase the firmness of the support plates; the device is transformed into an assembled structure, which is convenient for disassembly and installation.

[0010] Preferably, the displacement device includes a slider hinged to the second scissor rod, a screw threaded through the slider, an axle seat fixedly connected to the end of the screw, and a driving assembly for driving the screw to rotate, the slider is slidably connected to the support plate, and the axle seat is fixedly connected to the support plate.

[0011] With the above structural design, the slider is displaced by rotating the screw rod, thereby realizing the telescopic function of the first scissor rod and the second scissor rod, thereby being able to change the jacking height, thereby being able to adapt to steel arch frames of different specifications.

[0012] Preferably, the drive assembly includes a first self-locking handwheel fixedly connected to the end of the screw.

[0013] With the above structural design, the screw rod is directly rotated by the first self-locking hand wheel, which has a simple structure, is easy to operate and saves costs.

[0014] Preferably, the drive assembly includes a driven bevel gear fixedly connected to the end of the screw, an active bevel gear meshing with the driven bevel gear, a rotating shaft fixedly connected to the active bevel gear, and a second self-locking handwheel fixedly connected to the rotating shaft, the rotating shaft is passed through a fixed plate, and the fixed plate is fixedly connected to the support plate.

[0015] By adopting the above structural design and adjusting the installation position of the second self-locking handwheel, it is convenient for the staff to rotate the second self-locking handwheel, so that the size of the second self-locking handwheel is not limited by the width of the support plate.

[0016] Preferably, the lifting plate is an arc-shaped plate.

[0017] By adopting the above structural design, the curvature of the jacking plate is matched with the curvature of the steel arch frame, which can better disperse and transfer the load during the support process, reduce the problem of concentrated stress, and help reduce the risk of sliding and tipping.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1) While the lifting mechanism of the device supports the steel arch frame, the workers can pass through the hollow frame surrounded by the support plates without hindering the workers from passing through the tunnel.

[0020] 2) The lifting mechanism of the device can change the lifting height, so as to adapt to steel arch frames of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0022] Figure 2 This is a front view of the structure of the first embodiment of the utility model;

[0023] Figure 3 This is a structural schematic diagram of a jacking mechanism in Embodiment 1 of the utility model;

[0024] Figure 4 This is a structural schematic diagram of the jacking mechanism of the second embodiment of the utility model; DETAILED DESCRIPTION

[0025] Embodiment 1:

[0026] See also Figure 1 , Figure 2 , Figure 3 The utility model provides a technical solution: a temporary support mechanism for a tunnel steel arch frame, comprising a support plate 1, and a lifting mechanism arranged on the support plate 1, wherein a plurality of support plates 1 are arranged, and the support plates 1 are enclosed to form an internal hollow frame structure, and a support assembly for reinforcing the support plates is arranged between adjacent support plates 1; the lifting mechanism comprises a first scissor rod 21 and a second scissor rod 22 hinged to each other, and a displacement device for driving the first scissor rod 21 and the second scissor rod 22 to extend and retract, the first scissor rod 21 is hinged on the support plate 1, a lifting plate 23 is hinged on the first scissor rod 21, and the second scissor rod 22 is arranged on the support plate 1.

[0027] Three groups of support plates 1 are provided, connection holes are provided at the ends of adjacent support plates 1, and adjacent support plates 1 are connected by bolts.

[0028] The support assembly includes a reinforcing plate 3 connected to the support plate 1 by bolts. Two reinforcing plates 3 are provided and are perpendicular to each other. A diagonal support plate 31 is provided between the reinforcing plates 3 .

[0029] The displacement device includes a slider 41 hinged to the second scissor rod 22, a screw 42 threadedly inserted into the slider 41, an axle seat 43 fixedly connected to the end of the screw 42, and a driving component for driving the screw 42 to rotate. The slider 41 is slidably connected to the support plate 1, and the axle seat 43 is fixedly connected to the support plate 1.

[0030] The driving assembly includes a driven bevel gear 51 fixedly connected to the end of the screw 42, an active bevel gear 52 meshing with the driven bevel gear 51, a rotating shaft 53 fixedly connected to the active bevel gear 52, and a second self-locking handwheel 54 fixedly connected to the rotating shaft 53. The rotating shaft is penetrated by a fixed plate 55, and the fixed plate 55 is fixedly connected to the support plate 1.

[0031] The lifting plate 23 is an arc-shaped plate, and the curvature of the lifting plate 23 matches the curvature of the steel arch frame, which better disperses and transmits the load during the support process, reduces the problem of concentrated stress, and helps to reduce the risk of sliding and tipping.

[0032] As a further improvement of the utility model, a stabilizing plate 7 is arranged between the relatively arranged supporting plates 1, and the stabilizing plate 7 is fixedly connected to the lower end of the supporting plate 1 by bolts. The end of the stabilizing plate 7 is fixedly connected to the angle brace 71, and the angle brace 71 is fixedly connected to the supporting plate 1 by bolts.

[0033] When the device is in use, the staff uses bolts to connect adjacent support plates 1, and then uses bolts to install the reinforcement plate on the support plate 1, and then uses bolts to install the stabilizing plate 7 and the angle brace 71 on the support plate 1; the staff erects the hollow frame surrounded by the support plates, and then the staff turns the second self-locking handwheel 54 to drive the active bevel gear 52 to rotate, so that the active bevel gear 52 drives the driven bevel gear 51 to rotate, and the driven bevel gear 51 rotates to drive the screw rod 42 to rotate, and the slider 41 on the screw rod 42 moves to the left on the support plate 1, the first scissor rod 21 and the second scissor rod 22 approach each other, and the jacking plate 23 moves until the jacking plate 23 supports the segmented steel arch frame.

[0034] Embodiment 2:

[0035] like Figure 4 As shown, the second embodiment is modified relative to the first embodiment. The driving assembly includes a first self-locking hand wheel 6 fixedly connected to the end of the screw rod 42, and the rest is in accordance with the second embodiment.

[0036] When the device is in use, the staff uses bolts to connect adjacent support plates 1, and then uses bolts to install the reinforcement plate on the support plate 1. Next, the staff uses bolts to install the stabilizing plate 7 and the angle brace 71 on the support plate 1; the staff erects the hollow frame surrounded by the support plates, and then the staff turns the first self-locking handwheel 6 to drive the screw 42 to rotate, and the slider 41 on the screw 42 moves to the left on the support plate 1, the first scissor rod 21 and the second scissor rod 22 approach each other, and the jacking plate 23 moves until the jacking plate 23 supports the segmented steel arch frame.

[0037] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0038] The present invention is described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the protection scope of the present invention. Various improvements may be made to the present invention and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A temporary support mechanism for a tunnel steel arch, comprising a support plate (1) and a jacking mechanism arranged on the support plate (1), characterized in that: A plurality of support plates (1) are provided, and the support plates (1) are enclosed to form an internal hollow frame structure, and support components for reinforcing the support plates are provided between adjacent support plates (1); the jacking mechanism comprises a first scissor rod (21) and a second scissor rod (22) hinged to each other, and a displacement device for driving the first scissor rod (21) and the second scissor rod (22) to extend and retract, the first scissor rod (21) being hinged on the support plate (1), and the jacking plate (23) being hinged on the first scissor rod (21).

2. A temporary support mechanism for a tunnel steel arch according to claim 1, characterized in that: The support assembly comprises a reinforcing plate (3) connected to a supporting plate (1) by means of bolts, two reinforcing plates (3) are provided and are perpendicular to each other, and a diagonal support plate (31) is provided between the reinforcing plates (3).

3. A temporary support mechanism for a tunnel steel arch according to claim 1, characterized in that: The displacement device comprises a slider (41) hinged to the second scissor rod (22), a screw rod (42) threadedly inserted into the slider (41), an axle seat (43) fixedly connected to the end of the screw rod (42), and a driving component for driving the screw rod (42) to rotate; the slider (41) is slidably connected to the support plate (1), and the axle seat (43) is fixedly connected to the support plate (1).

4. A temporary support mechanism for a tunnel steel arch according to claim 3, characterized in that: The drive assembly comprises a first self-locking hand wheel (6) fixedly connected to the end of a screw rod (42).

5. A temporary support mechanism for a tunnel steel arch according to claim 3, characterized in that: The driving assembly comprises a driven bevel gear (51) fixedly connected to the end of a screw rod (42), an active bevel gear (52) meshing with the driven bevel gear (51), a rotating shaft (53) fixedly connected to the active bevel gear (52), and a second self-locking hand wheel (54) fixedly connected to the rotating shaft (53); the rotating shaft is passed through a fixed plate (55), and the fixed plate (55) is fixedly connected to the support plate (1).

6. A temporary support mechanism for a tunnel steel arch according to claim 1, characterized in that: The lifting plate (23) is an arc-shaped plate.

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