Grating arch frame for underground excavation tunnel

Abstract

The utility model relates to a grid lagging jack for a subsurface tunnel, belongs to the technical field of tunnel construction equipment, and solves the technical problems that when an existing grid lagging jack for the subsurface tunnel is assembled and fixed, the operation is tedious and laborious, and the assembling, fixing and supporting efficiency is low. The underground excavation tunnel grid lagging jack comprises a first arc lagging jack; a second arc-shaped lagging jack; a base is arranged at the bottom end of the third arc-shaped lagging jack; the second arc-shaped lagging jacks are connected between the first arc-shaped lagging jack and the third arc-shaped lagging jacks, and the two second arc-shaped lagging jacks and the two third arc-shaped lagging jacks are arranged on the two sides of the first arc-shaped lagging jack; connecting structures between the second arc-shaped arch frame and the first arc-shaped arch frame and between the second arc-shaped arch frame and the third arc-shaped arch frame are buckle type connecting mechanisms. According to the underground excavation tunnel grid lagging jack, tool-free convenient connection can be carried out only in a simple inserting mode, and welding equipment for welding or multiple bolts for connection are not needed on site.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction equipment, in particular to a grille arch frame for a dark-dig tunnel. Background Art

[0002] Dark tunneling is a common process for power pipelines to pass under municipal roads. During the dark tunneling process, grid arch frames are required to quickly support the surrounding rock in the excavated area. After the support is completed, the surrounding rock is sealed to form a ring and a support system together with the support, thereby minimizing the occurrence of surrounding rock deformation. In actual tunnel excavation, steel mesh, steel frame, etc. are used for the support of the outer lining. After the outer support, the inner lining support is started. When lining the inner layer, cast-in-place concrete is generally used, and waterproofing of the inner and outer layers is also required.

[0003] In the prior art, the utility model patent with publication number CN202370542U discloses a grille arch frame for a dark-cut tunnel, which has a reduced contact area with the lining layer on the inner surface of the tunnel. When the temperature changes, the concrete lining layer will not produce shrinkage cracks. The grille arch frame for the dark-cut tunnel is light in weight, easy to transport and install, and brings many conveniences to tunnel construction.

[0004] However, although the above-mentioned dark-excavated tunnel grid arch frame is divided into a first base arch frame, a plurality of intermediate arch frames and a second base arch frame, and can be assembled and fixed on site by means of a plurality of bolts and a plurality of nuts, and is divided into multiple sections for convenient transportation, it still has the following shortcomings: the on-site assembly and fixation method using a plurality of bolts and a plurality of nuts requires the use of special tools to tighten each one by one, the operation is cumbersome and time-consuming, the assembly and support efficiency is low, and it cannot meet the rapid support requirements after dark-excavation. Utility Model Content

[0005] The utility model provides a grille arch frame for a dark-digging tunnel, which is used to solve the technical problems in the prior art that the grille arch frame for a dark-digging tunnel needs to be assembled and fixed on site using multiple bolts and multiple nuts, resulting in cumbersome and laborious operation and low assembly and support efficiency.

[0006] The utility model is realized by the following technical scheme: a grille arch frame of a dark-excavated tunnel, comprising:

[0007] A first arc-shaped arch frame, used for supporting the top wall of the tunnel;

[0008] A second arc-shaped arch frame is used to support the middle wall of the tunnel;

[0009] A third arc-shaped arch frame, used for supporting the lower wall of the tunnel, and a base is provided at the bottom end of the third arc-shaped arch frame;

[0010] The second arc-shaped arch frame is connected between the first arc-shaped arch frame and the third arc-shaped arch frame, and the number of the second arc-shaped arch frame and the number of the third arc-shaped arch frame are both two, and the two second arc-shaped arch frames and the two third arc-shaped arch frames are symmetrically arranged on both sides of the first arc-shaped arch frame;

[0011] Wherein, the connection structure between the second arc-shaped arch frame and the first arc-shaped arch frame and the connection structure between the second arc-shaped arch frame and the third arc-shaped arch frame are both snap-on connection mechanisms.

[0012] Further, in order to better realize the present invention, both ends of the first arc-shaped arch frame, the top and bottom ends of the second arc-shaped arch frame, and the top end of the third arc-shaped arch frame are all connecting ends, and the snap-on connecting mechanism is installed between two adjacent connecting ends one above and one below, and of the two adjacent connecting ends, the one located above is the upper connecting end, and the one located below is the lower connecting end;

[0013] The snap-on connection mechanism comprises:

[0014] A first block, the top surface of which is welded to the upper connecting end, an insert block is fixedly arranged on the bottom surface of the first block, an inclined surface is arranged on the outer wall of the insert block, and a clamping hole is opened on the inclined surface;

[0015] A second block, the bottom surface of which is welded to the lower connecting end, a slot adapted to the plug block is provided on the top surface of the second block, and a sliding hole is provided on the side groove wall of the slot;

[0016] A clamping rod is slidably inserted into the sliding hole, and the clamping rod is elastically connected to the second block through an elastic member;

[0017] The first block is overlapped on the second block, and the insert block is inserted into the slot;

[0018] When the insert block is inserted into the slot, the inclined surface presses the clamping rod so that the clamping rod enters the sliding hole and compresses the elastic member;

[0019] When the clamping hole corresponds to the clamping rod, the clamping rod is inserted into the clamping hole under the driving of the elastic member.

[0020] Furthermore, in order to better implement the present invention, the outer side wall of the second block is further provided with a mounting hole, in which a mounting tube is installed, and the tube mouth of the mounting tube corresponds to and communicates with the sliding hole;

[0021] One end of the clamping rod is used to cooperate with the inclined surface, and the other end of the clamping rod passes through the sliding hole and extends into the mounting tube. A sliding block is fixedly connected to the other end of the clamping rod, and the sliding block is slidably inserted in the mounting tube. The elastic member is installed between the sliding block and the bottom of the mounting tube.

[0022] Furthermore, in order to better implement the present invention, the elastic member is a spring, a concave hole is provided on the end surface of the sliding block away from the clamping rod, and one end of the spring is placed in the concave hole.

[0023] Furthermore, in order to better implement the present invention, the sliding block is a structural member made of ferromagnetic material, and an electromagnet is also installed at the bottom of the installation cylinder.

[0024] Furthermore, in order to better implement the present invention, a ball groove is provided at one end of the clamping rod, and a ball for rolling cooperation with the inclined surface is rollingly installed in the ball groove.

[0025] Furthermore, in order to better implement the present invention, a positioning protrusion is provided on the top edge of the second block, a positioning notch adapted to the positioning protrusion is provided on the bottom edge of the first block, and the positioning protrusion is inserted into the positioning notch.

[0026] Furthermore, in order to better implement the present invention, a support rod is installed between the inner arc wall of the first arc-shaped arch frame and the inner arc wall of the second arc-shaped arch frame.

[0027] Furthermore, in order to better implement the present invention, a clamping seat is welded on the inner arc wall of the second arc-shaped arch frame, and the clamping seat is provided with a clamping groove;

[0028] A support is welded on the inner arc wall of the first arc-shaped arch;

[0029] One end of the support rod is clamped in the clamping groove, and the other end of the support rod is hinged to the support.

[0030] Furthermore, in order to better realize the present utility model, the first arc-shaped arch frame, the second arc-shaped arch frame and the third arc-shaped arch frame are all grid frames, and the grid frame includes an outer arc-shaped plate, an inner arc-shaped plate and a plurality of reinforcing ribs, and the plurality of reinforcing ribs are welded and fixed between the outer arc-shaped plate and the inner arc-shaped plate to form a grid.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] The utility model provides a grille arch frame for a dark-excavated tunnel, comprising a first arc-shaped arch frame for supporting a top wall of the tunnel, a second arc-shaped arch frame for supporting a middle wall of the tunnel, and a third arc-shaped arch frame for supporting a lower wall of the tunnel. A base is provided at the bottom end of the third arc-shaped arch frame so as to place it on the ground of the tunnel. The second arc-shaped arch frame is connected between the first arc-shaped arch frame and the third arc-shaped arch frame, and the number of the second arc-shaped arch frame and the number of the third arc-shaped arch frames are both two. The two second arc-shaped arch frames and the two third arc-shaped arch frames are symmetrically arranged on both sides of the first arc-shaped arch frame. The connection structure between the second arc-shaped arch frame and the first arc-shaped arch frame and the connection structure between the second arc-shaped arch frame and the third arc-shaped arch frame are both snap-on connection mechanisms.

[0033] Through the above structure, the dark-excavated tunnel grating arch frame provided by the utility model utilizes multiple sections of arc-shaped arch frames to jointly support the wall of the tunnel. The multiple sections of arc-shaped arch frames are prefabricated in the factory and transported to the construction site, and then assembled. Therefore, the dark-excavated tunnel grating arch frame has the advantage of being easy to transport, thereby facilitating the movement of the dark-excavated tunnel grating arch frame to the construction site. Moreover, each section of the arc-shaped arch frame is connected by a snap-on connection mechanism. Therefore, during assembly, it is only necessary to perform tool-free, convenient self-locking connection and fixation of multiple arc-shaped arch frames by simple plug-in, without the need for on-site welding equipment or multiple bolt connections, which saves time and effort, improves on-site assembly connection efficiency and operation convenience, and improves the efficiency of dark-excavated tunnel assembly and support. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of a grille arch frame of a dark-excavated tunnel provided by an embodiment of the utility model;

[0036] Figure 2 yes Figure 1 Another perspective view of the grille arch of the dark-excavated tunnel shown;

[0037] Figure 3 yes Figure 1 The front view of the grille arch of the dark-excavated tunnel is shown;

[0038] Figure 4 yes Figure 3 A partial enlarged view of area A in .

[0039] In the figure:

[0040] 100-first arc-shaped arch frame, 110-support, 200-second arc-shaped arch frame, 210-clamping seat, 300-third arc-shaped arch frame, 310-base, 400-snap-type connection mechanism, 410-first block, 411-insertion block, 412-inclined surface, 413-clamping hole, 420-second block, 421-slot, 422-sliding hole, 423-installing cylinder, 424-electromagnet, 425-positioning protrusion, 430-clamping rod, 431-sliding block, 432-ball, 440-spring, 500-support rod, 600-outer arc-shaped plate, 700-inner arc-shaped plate, 800-reinforcement rib. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0042] Example:

[0043] The utility model provides a dark tunnel grid arch frame such as Figure 1-Figure 3 As shown, it includes a first arc-shaped arch frame 100, a second arc-shaped arch frame 200 and a third arc-shaped arch frame 300, wherein:

[0044] The first arc-shaped arch frame 100 is used to support the top wall of the tunnel, the second arc-shaped arch frame 200 is used to support the middle wall of the tunnel, and the third arc-shaped arch frame 300 is used to support the lower wall of the tunnel. The second arc-shaped arch frame 200 is connected between the first arc-shaped arch frame 100 and the third arc-shaped arch frame 300. The number of the second arc-shaped arch frame 200 and the third arc-shaped arch frame 300 is two, and the two second arc-shaped arch frames 200 and the two third arc-shaped arch frames 300 are symmetrically arranged on both sides of the first arc-shaped arch frame 100. In this way, one first arc-shaped arch frame 100, two second arc-shaped arch frames 200 and two third arc-shaped arch frames 300 form a superior arc-shaped support structure with a lower opening. A base 310 is provided at the bottom end of the third arc-shaped arch frame 300 so that it can be placed on the tunnel ground.

[0045] The connection structure between the second arc-shaped arch frame 200 and the first arc-shaped arch frame 100 and the connection structure between the second arc-shaped arch frame 200 and the third arc-shaped arch frame 300 are both snap-fit ​​connection mechanisms 400. Specifically, the top end of the second arc-shaped arch frame 200 is connected to the end of the first arc-shaped arch frame 100 through the snap-fit ​​connection mechanism 400, and the top end of the third arc-shaped arch frame 300 is connected to the bottom end of the second arc-shaped arch frame 200 through the snap-fit ​​connection mechanism 400.

[0046] Through the above structure, the dark-excavated tunnel grating arch frame provided by the utility model utilizes multiple sections of arc-shaped arch frames to jointly support the wall of the tunnel. The multiple sections of arc-shaped arch frames are prefabricated in the factory and transported to the construction site, and then assembled. Therefore, the dark-excavated tunnel grating arch frame has the advantage of being easy to transport, thereby facilitating the movement of the dark-excavated tunnel grating arch frame to the construction site. Moreover, each section of the arc-shaped arch frame is connected by a snap-on connection mechanism 400. Therefore, during assembly, it is only necessary to perform tool-free, convenient self-locking connection and fixation of multiple arc-shaped arch frames by simple plug-in, without the need for on-site welding equipment or multiple bolt connections, which saves time and effort, improves on-site assembly connection efficiency and operation convenience, and improves the efficiency of dark-excavated tunnel assembly and support.

[0047] An optional implementation of the present embodiment is as follows: define the two ends of the above-mentioned first arc arch 100, the top and bottom ends of the second arc arch 200, and the top end of the third arc arch 300 as connecting ends, and the two connecting ends of the second arc arch 200 are respectively connected to the connecting end of the first arc arch 100 and the connecting end of the third arc arch 300 through different above-mentioned snap-on connecting mechanisms 400, that is, the snap-on connecting mechanism 400 is installed between two adjacent connecting ends one above and one below, and define that of the two adjacent connecting ends, the one located above is the upper connecting end, and the one located below is the lower connecting end.

[0048] The buckle connection mechanism 400 in this embodiment is shown in Figure 4, which includes a first block 410, a second block 420 and a clamping rod 430, wherein:

[0049] The top surface of the first block 410 is welded to the above-mentioned upper connecting end, and the bottom surface of the first block 410 is a plane. An insert block 411 is integrally formed in the middle position of the bottom surface of the first block 410, and the outer wall of the insert block 411 is provided with a slope 412, which extends from the middle and upper position of the insert block 411 to its bottom end, and a clamping hole 413 located at the end of the slope 412 is opened on the outer side wall of the middle and upper part of the insert block 411.

[0050] The bottom surface of the second block 420 is welded to the above-mentioned lower connecting end, and the top surface of the second block 420 is a plane. A slot 421 is provided in the middle position of the top surface of the second block 420, and the slot 421 corresponds to and fits with the above-mentioned plug-in block 411. A sliding hole 422 is provided on the side groove wall of the slot 421, and the sliding hole 422 is located on the side corresponding to the inclined surface 412 on the plug-in block 411.

[0051] The above-mentioned clamping rod 430 is slidably inserted into the above-mentioned sliding hole 422, and the clamping rod 430 is adapted to the above-mentioned clamping hole 413 so that the clamping rod 430 can be inserted into the above-mentioned clamping hole 413. The clamping rod 430 is elastically connected to the above-mentioned second block 420 through an elastic member. The setting of the elastic member allows the clamping rod 430 to elastically expand and contract in the sliding hole 422.

[0052] It should be noted that the first block 410 is pre-welded to the above-mentioned upper connecting end in the factory, and the second block 420 is also pre-welded to the above-mentioned lower connecting end in the factory. Specifically, the above-mentioned first block 410 is welded at both ends of the above-mentioned first arc arch 100, the above-mentioned second block 420 is welded at the top of the second arc arch 200, the above-mentioned first block 410 is welded at the bottom end of the second arc arch 200, and the above-mentioned second block 420 is welded at the top of the third arc arch 300.

[0053] During assembly, the first block 410 is overlapped on the second block 420 so that the bottom surface of the first block 410 is connected to the bottom surface of the second block 420, and then the insert block 411 is inserted into the above-mentioned slot 421. During the process of inserting the insert block 411 into the above-mentioned slot 421, the above-mentioned inclined surface 412 squeezes one end of the above-mentioned clamping rod 430, so that the clamping rod 430 enters the above-mentioned sliding hole 422 and compresses the above-mentioned elastic member. At this time, the elastic member accumulates elastic potential energy. When the insert block 411 enters the appropriate position of the slot 421, the clamping hole 413 on the insert block 411 is opposite to the above-mentioned sliding hole 422, and the clamping rod 430 is opposite to the above-mentioned clamping hole 413. At this time, the elastic member releases elastic potential energy, thereby driving the clamping rod 430 to insert into the above-mentioned clamping hole 413.

[0054] Therefore, during the assembly process, the staff only needs to insert the plug block 411 on the first block 410 into the slot 421 in the second block 420 through simple plugging, and the clamping rod 430 can be automatically inserted into the clamping hole 413, thereby automatically locking the second block 420 and the first block 410, which is simple and convenient to operate. In fact, the locking principle of the above-mentioned snap-on connection mechanism 400 is the limiting effect of the clamping rod 430 on the first block 410 and the second block 420.

[0055] Of course, the locking rod 430 in the snap-on connection mechanism 400 in this embodiment can also be replaced by a locking pin. In this case, a first locking hole is opened on the side groove wall of the above-mentioned slot 421, and the first locking hole passes through the above-mentioned second block 420. A second locking hole is opened on the outer side wall of the above-mentioned slot 421, and the second locking hole corresponds to the first locking hole. When the plug block 411 is inserted into the slot 421, the locking pin can be inserted into the first locking hole and the second locking hole from the side.

[0056] An optional implementation of the present embodiment is as follows: a mounting hole is opened on the outer wall of the second block 420, and the mounting hole corresponds to and is connected with the above-mentioned sliding hole 422. A mounting cylinder 423 is screwed or welded in the mounting hole, and the cylinder mouth of the mounting cylinder 423 is located on the inner side of the mounting hole, and the cylinder bottom of the mounting cylinder 423 is located on the outer side of the mounting hole, and the cylinder mouth of the mounting cylinder 423 corresponds to and is connected with the above-mentioned sliding hole 422.

[0057] The above-mentioned clamping rod 430 is a straight rod, one end of which is used to cooperate with the above-mentioned inclined surface 412, and the other end of the clamping rod 430 passes through the sliding hole 422 and extends into the above-mentioned mounting tube 423. A slider 431 is fixedly provided at the other end of the clamping rod 430, and the slider 431 is adapted to the above-mentioned mounting tube 423. The slider 431 is slidably inserted in the mounting tube 423, and the slider 431 is used to position and guide the translation of the clamping rod 430. The above-mentioned elastic member is installed between the slider 431 and the bottom of the mounting tube 423.

[0058] When the plug block 411 enters the slot 421, the inclined surface 412 abuts against the clamping rod 430 and pushes the clamping rod 430 toward the inside of the installation tube 423, so that the slider 431 moves toward the bottom of the installation tube 423, and the slider 431 compresses the elastic member. When the clamping rod 430 corresponds to the clamping hole 413, the elastic member releases the elastic force and drives the slider 431 to move toward the side of the tube mouth of the installation tube 423, so that the clamping rod 430 enters the clamping hole 413. It should be noted that the outer diameter of the above-mentioned slider 431 is larger than the inner hole of the above-mentioned sliding hole 422, so that the slider 431 will not enter the above-mentioned sliding hole 422.

[0059] The above-mentioned installation tube 423 is actually a specific installation method of the slide rod. Of course, the above-mentioned slide hole 422 can also not penetrate the second block 420, and the elastic member is placed in the slide hole 422, and then the clamping rod 430 is placed in the slide hole 422. In this case, the above-mentioned installation tube 423 is not required.

[0060] Optionally, the elastic member is a spring 440, and a concave hole is provided on the end surface of the slider 431 away from the clamping rod 430, one end of the spring 440 is placed in the concave hole, and the other end of the spring 440 abuts against the bottom of the mounting tube 423. Of course, the elastic member can also be an inflatable sac.

[0061] An optional implementation of this embodiment is as follows: the slider 431 is a structural member made of ferromagnetic carbon material (such as iron), the mounting tube 423 and the clamping rod 430 are structural members made of non-ferromagnetic materials such as stainless steel, and an electromagnet 424 is also installed at the bottom of the mounting tube 423. Of course, it also includes a battery for powering the electromagnet 424, which is installed in the mounting tube 423, and a wire connecting the electromagnet and the electromagnet 424, which is electrically connected to a wireless switch for remote control.

[0062] Thus, when the electromagnet 424 is powered on, a magnetic attraction is generated to attract the slider 431, so that the clamping rod 430 is retracted into the slide hole 422, thereby facilitating the disassembly of the snap-on connection structure. When disassembly is not required, the electromagnet 424 is kept powered off.

[0063] Of course, the electromagnet 424 may not be installed. In this case, if the snap-fit ​​connection structure needs to be disassembled, a hammer may be used to violently knock open the snap-fit ​​connection structure.

[0064] An optional implementation of this embodiment is as follows: a ball 432 groove is provided at one end of the above-mentioned clamping rod 430 that cooperates with the inclined surface 412, and a ball 432 is rollingly installed in the ball 432 groove, and the ball 432 is used to roll with the inclined surface 412. With the help of the above-mentioned ball 432, the insert block 411 can be inserted into the slot 421 more smoothly.

[0065] An optional implementation of the present embodiment is as follows: a positioning protrusion 425 is provided on the top edge of the second block 420, and a positioning notch is provided on the bottom edge of the first block 410, the positioning notch is matched with the positioning protrusion 425, and when assembled, the positioning protrusion 425 is inserted into the positioning notch, thereby positioning the first block 410 and the second block 420, and avoiding relative translation of the first block 410 and the second block 420 in the horizontal direction when assembled.

[0066] An optional implementation of this embodiment is as follows: a support rod 500 is installed between the inner arc wall of the first arc arch 100 and the inner arc wall of the second arc arch 200. With the support rod 500, the structural strength of the entire dark-excavated tunnel grid arch is further enhanced, so that the dark-excavated tunnel grid arch can more effectively support the tunnel wall, and the probability of deformation of the dark-excavated tunnel grid arch during use is reduced.

[0067] Optionally, a holder 210 is welded on the inner arc wall of the second arc arch 200, and the holder 210 is provided with a slot, and a support 110 is welded on the inner arc wall of the first arc arch 100, and the support 110 can further enhance the structural strength of the first arc arch 100. One end of the support rod 500 is clamped in the slot, and the other end of the support rod 500 is hinged to the support 110. After the first arc arch 100 and the second arc arch 200 are assembled together, the support rod 500 is rotated so that one end of the support rod 500 is clamped in the slot.

[0068] Of course, both ends of the support rod 500 may also be respectively welded and fixed to the inner arc wall of the first arc-shaped arch frame 100 and the inner arc wall of the second arc-shaped arch frame 200 .

[0069] An optional implementation of this embodiment is as follows: the first arc-shaped arch frame 100, the second arc-shaped arch frame 200 and the third arc-shaped arch frame 300 are all grid frames, and the grid frame includes an outer arc-shaped plate 600, an inner arc-shaped plate 700 and a plurality of reinforcing ribs 800, and the plurality of reinforcing ribs 800 are welded and fixed between the outer arc-shaped plate 600 and the inner arc-shaped plate 700 to form a grid. The first arc-shaped arch frame 100, the second arc-shaped arch frame 200 and the third arc-shaped arch frame 300 of this structure have high structural strength and are light in weight.

[0070] The specific assembly process of the dark-excavated tunnel grid arch provided in this embodiment is as follows:

[0071] First, place the base 310 on the third arc arch 300 flat on the ground in the tunnel, so that the third arc arch 300 supports the lower wall of the tunnel, and then place the second arc arch 200 on the top of the third arc arch 300, so that the plug 411 on the first block 410 at the bottom of the second arc arch 200 is inserted into the slot 421 on the second block 420 at the top of the third arc arch 300 and locked, and then place the first arc arch 100 on the second arc arch 200, so that the plug 411 on the first block 410 at the end of the first arc arch 100 is inserted into the slot 421 on the second block 420 at the top of the second arc arch 200 and locked, and finally rotate the support rod 500 so that the support rod 500 is clamped on the base 210 on the second arc arch 200.

[0072] Of course, if the installation space in the tunnel is limited, the grille arch frame can be assembled outside the tunnel first, and then the assembled dark-bored tunnel can be transported into the tunnel.

[0073] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope recorded in the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A dark tunnel grid arch frame, characterized in that: include: A first arc-shaped arch (100) for supporting the top wall of the tunnel; A second arc-shaped arch (200) is used to support the middle wall of the tunnel; A third arc-shaped arch frame (300) is used to support the lower wall of the tunnel, and a base (310) is provided at the bottom end of the third arc-shaped arch frame (300); The second arc-shaped arch frame (200) is connected between the first arc-shaped arch frame (100) and the third arc-shaped arch frame (300), and the number of the second arc-shaped arch frame (200) and the number of the third arc-shaped arch frame (300) are both two, and the two second arc-shaped arch frames (200) and the two third arc-shaped arch frames (300) are symmetrically arranged on both sides of the first arc-shaped arch frame (100); Wherein, the connection structure between the second arc-shaped arch frame (200) and the first arc-shaped arch frame (100) and the connection structure between the second arc-shaped arch frame (200) and the third arc-shaped arch frame (300) are both snap-on connection mechanisms (400); Both ends of the first arc-shaped arch frame (100), the top and bottom ends of the second arc-shaped arch frame (200), and the top end of the third arc-shaped arch frame (300) are all connecting ends, and the snap-on connecting mechanism (400) is installed between two adjacent connecting ends, one above and one below, and of the two adjacent connecting ends, the one located above is the upper connecting end, and the one located below is the lower connecting end; The snap-on connection mechanism (400) comprises: A first block (410), the top surface of which is welded to the upper connection end, an insert block (411) is fixedly arranged on the bottom surface of the first block (410), an inclined surface (412) is arranged on the outer wall of the insert block (411), and a clamping hole (413) is opened on the inclined surface (412); A second block (420), the bottom surface of which is welded to the lower connecting end, a slot (421) adapted to the insert block (411) is provided on the top surface of the second block (420), and a sliding hole (422) is provided on the side groove wall of the slot (421); A clamping rod (430) is slidably inserted into the sliding hole (422), and the clamping rod (430) is elastically connected to the second block (420) via an elastic member; The first block (410) is overlapped on the second block (420), and the insert block (411) is inserted into the slot (421); When the insert block (411) is inserted into the slot (421), the inclined surface (412) presses the clamping rod (430) so that the clamping rod (430) enters the sliding hole (422) and compresses the elastic member; When the clamping hole (413) corresponds to the clamping rod (430), the clamping rod (430) is inserted into the clamping hole (413) under the drive of the elastic member.

2. The dark-excavated tunnel grid arch according to claim 1 is characterized in that: The outer side wall of the second block (420) is also provided with a mounting hole, in which a mounting tube (423) is mounted, and the tube mouth of the mounting tube (423) corresponds to and communicates with the sliding hole (422); One end of the clamping rod (430) is used to cooperate with the inclined surface (412), and the other end of the clamping rod (430) passes through the sliding hole (422) and extends into the installation tube (423). A sliding block (431) is fixedly connected to the other end of the clamping rod (430), and the sliding block (431) is slidably inserted in the installation tube (423). The elastic member is installed between the sliding block (431) and the bottom of the installation tube (423).

3. The dark-excavated tunnel grid arch according to claim 2 is characterized in that: The elastic member is a spring (440), and a concave hole is provided on the end surface of the sliding block (431) away from the clamping rod (430), and one end of the spring (440) is placed in the concave hole.

4. The dark-excavated tunnel grid arch according to claim 3 is characterized in that: The sliding block (431) is a structural member made of ferromagnetic material, and an electromagnet (424) is also installed at the bottom of the installation cylinder (423).

5. The dark-excavated tunnel grid arch according to claim 4 is characterized in that: A ball groove is formed at one end of the clamping rod (430), and a ball (432) is rollingly installed in the ball groove for rolling cooperation with the inclined surface (412).

6. The dark-excavated tunnel grid arch according to claim 1, characterized in that: A positioning protrusion (425) is provided on the top edge of the second block (420), and a positioning notch adapted to the positioning protrusion (425) is provided on the bottom edge of the first block (410), and the positioning protrusion (425) is inserted into the positioning notch.

7. The dark-excavated tunnel grid arch according to any one of claims 1 to 6, characterized in that: A support rod (500) is installed between the inner arc wall of the first arc-shaped arch frame (100) and the inner arc wall of the second arc-shaped arch frame (200).

8. The dark-excavated tunnel grid arch according to claim 7, characterized in that: A clamping seat (210) is welded on the inner arc wall of the second arc-shaped arch frame (200), and the clamping seat (210) is provided with a clamping slot; A support (110) is welded on the inner arc wall of the first arc-shaped arch frame (100); One end of the support rod (500) is clamped in the clamping groove, and the other end of the support rod (500) is hinged to the support (110).

9. The dark-excavated tunnel grid arch according to claim 1, characterized in that: The first arc-shaped arch frame (100), the second arc-shaped arch frame (200) and the third arc-shaped arch frame (300) are all grid frames, and the grid frames include an outer arc-shaped plate (600), an inner arc-shaped plate (700) and a plurality of reinforcing ribs (800), and the plurality of reinforcing ribs (800) are welded and fixed between the outer arc-shaped plate (600) and the inner arc-shaped plate (700) to form a grid.

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