Tunnel steel arch fixture ruler

Abstract

The utility model discloses a tunnel steel arch fixture ruler, which relates to the technical field of fixture rulers, and comprises a horizontal cross rod, a first supporting rod and a second supporting rod, the central axis of the extension rod piece and the central axis of the horizontal cross rod are arranged in parallel or in an overlapped mode, the extension rod piece is movably arranged in the first containing groove and can slide in the first containing groove, and scale marks are arranged on the extension rod piece; the supporting leg assembly is arranged on the horizontal cross rod, and the supporting leg assembly is arranged to vertically support the horizontal cross rod; the extension rod piece is arranged to adjust the accumulated length of the displayed scale marks by sliding in the first containing groove. And the height of the supporting leg assembly can be independently adjusted. The supporting leg assembly is arranged to be of an independently-adjusted structure, horizontal supporting of the horizontal cross rod is guaranteed, and therefore the purposes that the levelness of the horizontal cross rod is guaranteed, and a clamping tool ruler does not need to be supported through external tools such as a cushion block are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture ruler, concretely relates to a tunnel steel arch support fixture ruler. BACKGROUND

[0002] Steel arch support is widely applied in tunnel initial support, especially when the surrounding rock condition is poor, can provide enough support resistance rapidly, satisfies the main rigidity required by initial support, controls the surrounding rock to continue to relax and plastic zone to continue to expand rapidly, limits the excessive deformation of surrounding rock, guarantees the stability of tunnel support structure system, and it is usually made of profile steel, such as I-beam, U-shaped steel etc. When installing tunnel steel arch support, in order to ensure the spacing and perpendicularity of steel arch support after installation, it needs to use fixture ruler to assist steel arch support installation, controls the spacing of steel arch support through horizontal connecting rod, and the perpendicularity of steel arch support is accurately controlled through bubble level, so that the support of steel arch support is uniform and the support force is vertically upward, and the optimal support effect is guaranteed.

[0003] The existing tunnel steel arch support fixture ruler is directly placed on the ground for horizontal adjustment when in use, for example, a kind of tunnel steel arch support fixture ruler is disclosed in the authorized announcement No.CN208282748U, including horizontal connecting rod and the end rod being arranged at the both ends of horizontal connecting rod, the end rod is perpendicular to the horizontal connecting rod, and the end rod and the horizontal connecting rod are located in the same plane, bubble level is arranged on the horizontal connecting rod, the spacing of steel arch support can be effectively controlled through horizontal connecting rod, the perpendicularity of steel arch support can be accurately controlled through bubble level, so that the spacing and perpendicularity of tunnel steel arch support can be guaranteed, the accuracy when installing tunnel steel arch support is controlled, the support of steel arch support is uniform and the support force is vertically upward, and the optimal support effect of tunnel steel arch support is guaranteed.

[0004] When in actual use, it is found that when tunnel initial construction, since the ground in tunnel is not flat enough, the fixture ruler is placed on the ground, in order to keep the horizontal of fixture ruler, the posture of fixture ruler needs to be adjusted artificially constantly, not only influence the use efficiency of fixture ruler, and when being touched by external object, the fixture ruler and the lower cushion block are easy to separate, and then the levelness of fixture ruler needs to be adjusted again, there is great inconvenience in use.

[0005] Therefore, the present application is proposed. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of tunnel steel arch support fixture ruler, the fixture ruler is kept by being set as the structure of independent adjustment to the supporting leg component, the horizontal support of horizontal cross bar is guaranteed, to solve the problem that manual adjustment horizontal cross bar height is complicated in prior art, fixture ruler bottom and cushion block separate after appearing and need to be adjusted again.

[0007] The utility model discloses an embodiment of the utility model provides a tunnel steel arch support fixture ruler, including,

[0008] Horizontal cross bar, its inside axial direction is provided with first containing groove;

[0009] Extension link, the central axis of which is parallel with or overlaps with the central axis of horizontal cross bar, and the extension link is movably arranged in the first containing groove and can slide in the first containing groove, and a scale line is arranged on the extension link;

[0010] Support leg assembly, arranged on horizontal cross bar, and the support leg assembly is arranged to vertically support horizontal cross bar;

[0011] Wherein, the extension link is arranged to adjust the cumulative length of the displayed scale line by sliding in the first containing groove.

[0012] The height of the support leg assembly can be independently adjusted.

[0013] Optionally, the support leg assembly includes a plurality of support leg pieces, the top of each support leg piece is hinged to the horizontal cross bar and can rotate at least 90 degrees around the horizontal cross bar.

[0014] Optionally, the support leg piece is provided with two, which are first support leg piece and second support leg piece, and the first support leg piece and the second support leg piece are arranged on both sides of the bottom of the horizontal cross bar, the top of the horizontal cross bar is provided with a level, and the first support leg piece and the second support leg piece are horizontally symmetrically arranged on the horizontal cross bar.

[0015] Optionally, each support leg piece includes a hollow support column and a telescopic leg, the telescopic leg is arranged in the hollow support column and can move axially in the hollow support column, the hollow support column is provided with a first fastening bolt, and the first fastening bolt is arranged to abut against the telescopic leg and vertically limit the telescopic leg in the hollow support column by screw adjustment.

[0016] Optionally, the telescopic leg is arranged at the bottom of the hollow support column, the side surface of the hollow support column is provided with a vertical side slot at the lower end, the top of the telescopic leg is provided with a sliding block, and the sliding block is arranged in the hollow support column, and the side slot is arranged to limit the vertical sliding of the sliding block within its range.

[0017] Optionally, the top of the hollow support column is provided with a fixing block, the fixing block is connected with the horizontal cross bar, and the hollow support column can rotate relative to the fixing block.

[0018] A first side block is arranged on the fixing block, a second side block is arranged on the hollow support column, the first side block is located above the second side block, the first side block and the second side block are connected by a vertical stud, and the vertical stud is arranged to limit the verticality of the hollow support column and the horizontal cross bar.

[0019] Optionally, the lengthening rod piece comprises a first lengthening rod and a second lengthening rod, the first lengthening rod and the second lengthening rod are arranged at two sides of the first accommodating groove respectively and are capable of axially sliding in the first accommodating groove;

[0020] The second fastening bolt is arranged to be capable of abutting against the first lengthening rod and axially limiting the first lengthening rod in the first accommodating groove through screw adjustment, and the third fastening bolt is arranged to be capable of abutting against the second lengthening rod and axially limiting the second lengthening rod in the first accommodating groove through screw adjustment.

[0021] Optionally, the first lengthening rod is internally axially provided with a second accommodating groove, and the second lengthening rod is arranged in the second accommodating groove and is capable of axially moving along the second accommodating groove.

[0022] The second lengthening rod is capable of being hidden in the second accommodating groove, and the first lengthening rod is capable of being hidden in the first accommodating groove.

[0023] Optionally, the scale line comprises a first scale line on the first lengthening rod and a second scale line on the second lengthening rod, one end of the first lengthening rod inserted into the first accommodating groove is provided with a limiting plate, and the limiting plate is used for preventing the first lengthening rod from being separated from the first accommodating groove.

[0024] Optionally, the other end of the first lengthening rod inserted into the first accommodating groove is provided with a first fitting plate, the other end of the second lengthening rod inserted into the second accommodating groove is provided with a second fitting plate, and the cross section of the first fitting plate and the second fitting plate is larger than the cross section of the horizontal cross bar.

[0025] The outer side of the first fitting plate and the second fitting plate is provided with an anti-skid line.

[0026] Compared with the prior art, the embodiment of the utility model has the following advantages and beneficial effects:

[0027] 1、The tunnel steel arch support fixture ruler provided by the embodiment of the utility model can keep the horizontal cross bar horizontal by adjusting the height of the supporting leg assembly when the steel arch support is measured, the supporting leg assembly can be independently adjusted, and the horizontal state can be quickly realized even on uneven bottom surface.

[0028] 2. The utility model discloses according to the length of steel arch, slide first extension rod and second extension rod, adjust the measurement range, when not need to use, second extension rod can hide in second containing groove, reduce the overall length of fixture ruler, convenient to carry. Through the combination setting of first extension rod and second extension rod, the measurement range of fixture ruler is expanded, and the sliding design of extension rod makes the adjustment of measurement range more flexible, reduces the complexity of manual operation, can adapt to steel arch of different lengths, enhances its versatility.

[0029] Generally, the utility model discloses the tunnel steel arch fixture ruler of embodiment provided passes to the horizontal support of horizontal cross bar with the structure that the support leg component is set to independent adjustment, guarantees the levelness of horizontal cross bar, does not need to use the purpose of external tool such as cushion block and supports fixture ruler. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be to the drawing needed in the embodiment used briefly introduces, should understand, the following drawing only shows some certain embodiment of the utility model, therefore should not be seen as the limitation to the scope, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0031] Figure 1 For the tunnel steel arch fixture ruler structure schematic diagram of embodiment of the utility model provides;

[0032] Figure 2 For the support leg piece structure schematic diagram of embodiment of the utility model provides;

[0033] Figure 3 For the telescopic leg structure schematic diagram of embodiment of the utility model provides;

[0034] Figure 4 For the first extension rod structure schematic diagram of embodiment of the utility model provides.

[0035] Mark and corresponding part name in the drawing:

[0036] 1-horizontal cross bar, 2-first containing groove, 3-extension rod piece, 4-first support leg piece, 5-second support leg piece, 6-level meter, 7-hollow support column, 8-telescopic leg, 9-first fastening bolt, 10-side groove, 11-sliding block, 12-fixed block, 13-first side block, 14-second side block, 15-perpendicular stud, 16-first extension rod, 17-second extension rod, 18-second fastening bolt, 19-third fastening bolt, 20-second containing groove, 21-first scale line, 22-second scale line, 23-limiting plate, 24-first lamination, 25-second lamination, 26-anti-skid pattern, 27-roughness. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0041] EMBODIMENT

[0042] As shown in Figure 1 The embodiments of the present application provide a tunnel steel arch support fixture ruler, which comprises a horizontal cross bar 1 and a level 6, wherein the level 6 is installed on the surface of the horizontal cross bar 1, the level 6 can be a conventional horizontal test tool on the market, and the tunnel steel arch support fixture ruler further comprises a second fastening bolt 18, a third fastening bolt 19, a first extension rod 16, a second extension rod 17, a first bonding plate 24, a second bonding plate 25 and a leg assembly.

[0043] The first extension rod 16 and the second extension rod 17 are both slidingly installed in the horizontal cross bar 1, and for example, a first accommodating groove 2 can be formed in the horizontal cross bar 1, and then the first extension rod 16 and the second extension rod 17 are inserted into the first accommodating groove 2. The axis of the first extension rod 16 and the second extension rod 17 is in line with the axis of the horizontal cross bar 1, and of course, in other embodiments, the central axis of the first extension rod 16 and the second extension rod 17 can also not overlap with the central axis of the horizontal cross bar 1, but can be arranged in parallel. The first fitting plate 24 and the second fitting plate 25 are respectively installed at the end of the first extension rod 16 and the second extension rod 17, and the installation mode can be adhesion, clamping, threaded connection, welding and the like, or even the first extension rod 16 and the first fitting plate 24 can be integrally arranged, and the second extension rod 17 and the second fitting plate 25 can be integrally arranged. In the embodiment of the utility model, the cross section of the first fitting plate 24 and the second fitting plate 25 can be arranged to be larger than the cross section of the horizontal cross bar 1. In this way, the contact area of the first fitting plate 24 and the second fitting plate 25 with the steel arch can be increased, the fitting gauge and the steel arch can be closely fitted, and the stability and reliability of the measurement can be improved. The leg assembly includes the first leg piece 4 and the second leg piece 5, and the first leg piece 4 and the second leg piece 5 are horizontally symmetrically installed at the bottom of the horizontal cross bar 1. In the embodiment of the utility model, the height of each leg piece can be independently adjusted without affecting each other, and the symmetrically arranged first leg piece 4 and the second leg piece 5 can better balance the weight of the horizontal cross bar 1 and ensure its stability. After being subjected to external force such as collision, the leg assembly can be restored to the vertical state through simple operation without the need for re-adjustment.

[0044] It should be noted that the number of leg pieces is not limited to the first leg piece 4 and the second leg piece 5 described above, and a third leg piece, a fourth leg piece and the like can also be arranged, or even only one leg piece can be arranged, which is not limited here, as long as the purpose of sufficient support stability can be achieved. Generally speaking, the more the number of leg pieces is arranged, the better the support stability is, but too many leg pieces can cause waste of materials. In the embodiment of the utility model, the first extension rod 16 and the second extension rod 17 form the extension rod piece 3, and of course, in other embodiments, the extension rod piece 3 can only include the first extension rod 16, or can be arranged to include the first extension rod 16, the second extension rod 17, a third extension rod, a fourth extension rod and the like, and the specific structure is not limited here, as long as the purpose of sufficient extension length can be achieved.

[0045] The second fastening bolt 18 and the third fastening bolt 19 are screwed on the side wall of the horizontal crossbar 1, and the end of the second fastening bolt 18 abuts against the side wall of the first extension rod 16, and the end of the third fastening bolt 19 abuts against the side wall of the second extension rod 17; after the second fastening bolt 18 and the third fastening bolt 19 are loosened, the first extension rod 16 and the second extension rod 17 can be pulled; after the second fastening bolt 18 and the third fastening bolt 19 are tightened, the first extension rod 16 and the second extension rod 17 can be fixed; the height of the first supporting leg 4 and the second supporting leg 5 can be independently adjusted to adapt to the uneven bottom surface, that is, the length of the first supporting leg 4 and the second supporting leg 5 can be flexibly adjusted to adapt to the uneven bottom surface in the tunnel, so that the horizontal crossbar 1 is kept in a horizontal state; and in use, in order to ensure the support stability of the supporting leg assembly, a flat plate with a larger width can be installed at the bottom of the supporting leg assembly.

[0046] Exemplarily, referring to FIGS. 1 to 3, Figure 2 and Figure 3 the first supporting leg 4 or the second supporting leg 5 comprises a hollow support column 7, a first side block 13, a vertical stud 15, a second side block 14, a fixing block 12, a side groove 10, a sliding block 11, a telescopic leg 8 and a first fastening bolt 9; the fixing block 12 is installed at the bottom of the horizontal crossbar 1, and can be connected by bonding, clamping, screwing, welding or the like, which is not limited here as long as the purpose of achieving sufficient connection stability can be achieved. The first side block 13 is fixed on the side wall of the fixing block 12, and the hollow support column 7 is rotatably installed at the bottom of the fixing block 12; the rotating structure can adopt an existing joint structure, and the rotating range is preferably 90 degrees, so that the telescopic leg 8 can be conveniently stored and used, and the flexibility of adjustment is improved; the vertical stud 15 can limit the rotation of the telescopic leg 8, and the support stability is improved.

[0047] The second side block 14 is fixed on the side wall of the hollow support column 7, the vertical stud 15 is screw-connected between the first side block 13 and the second side block 14, the side groove 10 is formed between the side walls of the support column, the sliding block 11 is slidingly arranged in the side groove 10, the telescopic leg 8 is fixed at the bottom of the sliding block 11 and can be integrally arranged or spliced, and the bottom of the telescopic leg 8 penetrates the bottom of the hollow support column 7 into the hollow interior; the first fastening bolt 9 is screwed on the side wall of the hollow support column 7, and the end of the first fastening bolt 9 abuts against the side wall of the telescopic leg 8; after the first fastening bolt 9 is loosened, the sliding block 11 can be slid in the side groove 10, so as to drive the telescopic leg 8 to move in the hollow structure, thereby changing the total length of the hollow support column 7 and the exposed telescopic leg 8, and the length of the two groups of supporting leg assemblies can be independently adjusted to adapt to the uneven ground surface in the tunnel.

[0048] As an embodiment of the present application, referring to FIGS. 1 to 3, Figure 4The surface of the first extension rod 16 is provided with a limiting plate 23, the limiting plate 23 prevents the first extension rod 16 from separating from the horizontal crossbar 1, and the inside of the first extension rod is provided with a second accommodating groove 20 matched with the second extension rod 17, the second extension rod 17 can be accommodated in the first extension rod 16 when being contracted, thereby reducing the total length when being contracted, so that the clamping ruler is convenient to carry and use.

[0049] As an embodiment of the utility model, referring to Figure 3 The rough part 27 extends to the side wall of the sliding block 11, under the action of the rough part 27, the friction between the first fastening bolt 9 and the sliding block 11 and the telescopic leg 8 can be increased, so that the telescopic leg 8 and the hollow support column 7 remain relatively stationary. It should be noted that the rough part 27 here can be a nylon material added, or can be sandblasting, scoring or coating treatment on the surface of the telescopic leg 8 to increase the surface roughness, which can be set according to actual needs. Similarly, referring to Figure 1 The anti-skid lines 26 can improve the measurement stability when being in contact with the steel arch.

[0050] As an embodiment of the utility model, referring to Figure 1 The surface of the first extension rod 16 and the surface of the second extension rod 17 are respectively provided with first scale lines 21 and second scale lines 22, the first scale lines 21 extend to both ends of the first extension rod 16, and the second scale lines 22 extend to both ends of the second extension rod 17, the total length of the clamping ruler can be conveniently checked through the scale lines, and the total length is the length of the horizontal crossbar 1 plus the scale value on the first extension rod 16 and the second extension rod 17 and the thickness of the two adhering plates. It should be noted that the length of the horizontal crossbar 1 and the thickness of the two adhering plates can be set according to actual working conditions, which is not limited here.

[0051] Working principle: in use, first need to hollow pillar 7 from the horizontal state to the vertical state, ensure its extension line with horizontal crossbar 1 keep perpendicular, so as to provide stable support for subsequent operation basis. Subsequently, the vertical stud 15 through the second side block 14 and with the first side block 13 screw connection, further fixed position of hollow pillar 7, make it with horizontal crossbar 1 always keep perpendicular relationship. Next, according to the ground level, loosen the first fastening bolt 9, pull the telescopic leg 8 along the side groove 10 sliding, adjust the exposed length of telescopic leg 8 to adapt to uneven ground. When the telescopic leg 8 adjustment to the appropriate position, tighten the first fastening bolt 9, will be telescopic leg 8 tightly fixed, ensure that the horizontal crossbar 1 is in the horizontal state. In addition, the telescopic leg 8 near the first fastening bolt 9 side is provided with roughness 27, which extends to the side wall of the sliding block 11, by increasing the friction between the first fastening bolt 9 and the sliding block 11 and the telescopic leg 8, ensure that the telescopic leg 8 and hollow pillar 7 keep relative static.

[0052] After the horizontal crossbar 1 is adjusted to the horizontal state, loosen the second fastening bolt 18 and the third fastening bolt 19, according to the construction width of the tunnel steel arch pull out the first extension rod 16 and the second extension rod 17. By sliding the first extension rod 16 and / or the second extension rod 17, the total length of the fixture ruler can be adjusted flexibly to adapt to steel arches of different lengths. After adjusting to the appropriate position, tighten the second fastening bolt 18 and the third fastening bolt 19, limit and fix the first extension rod 16 and the second extension rod 17, so as to ensure the stability during measurement. This structure not only improves the applicability of the fixture ruler, but also significantly improves the construction efficiency and measurement accuracy, especially in the complex construction environment in the tunnel.

[0053] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that the structures or components shown in the drawings are not necessarily drawn to scale, and the present application omits the description of known components and processing techniques and processes to avoid unnecessary limitation of the present application.

Claims

1. A tunnel steel arch frame clamp ruler, characterized in that, include: A horizontal crossbar (1) has a first receiving groove (2) axially arranged inside it; The extension rod (3) is arranged with its central axis parallel to or overlapping with the central axis of the horizontal bar (1). The extension rod (3) is movably arranged in the first receiving groove (2) and can slide in the first receiving groove (2). The extension rod (3) is provided with scale lines. A support leg assembly is disposed on the horizontal crossbar (1), and the support leg assembly is configured to provide vertical support for the horizontal crossbar (1); The extension rod (3) is configured to adjust the cumulative length of the displayed scale line by sliding it in the first receiving groove (2); The height of the outrigger assembly can be adjusted independently.

2. The tunnel steel arch frame clamp ruler according to claim 1, characterized in that, The outrigger assembly includes several outrigger pieces, the top of each outrigger piece being hinged to a horizontal crossbar (1) and capable of rotating about the horizontal crossbar (1) within a range of at least 90 degrees.

3. A tunnel steel arch frame clamp ruler according to claim 2, characterized in that, There are two support legs, namely a first support leg (4) and a second support leg (5). The first support leg (4) and the second support leg (5) are respectively located on both sides of the bottom of the horizontal crossbar (1). A level (6) is provided on the top of the horizontal crossbar (1). The first support leg (4) and the second support leg (5) are horizontally symmetrically arranged on the horizontal crossbar (1).

4. A tunnel steel arch frame clamp ruler according to claim 2, characterized in that, Each of the support legs includes a hollow support column (7) and a telescopic leg (8). The telescopic leg (8) is disposed inside the hollow support column (7) and is axially movable within the hollow support column (7). A first fastening bolt (9) is provided on the hollow support column (7). The first fastening bolt (9) is configured to abut against the telescopic leg (8) by screw adjustment and vertically limit the telescopic leg (8) within the hollow support column (7).

5. A tunnel steel arch frame clamp ruler according to claim 4, characterized in that, The telescopic leg (8) is located at the bottom of the hollow support column (7). A vertical side groove (10) is provided at the lower side of the hollow support column (7). A slider (11) is provided at the top of the telescopic leg (8). The slider (11) is located inside the hollow support column (7). The side groove (10) is configured to restrict the slider (11) from sliding vertically within its range.

6. A tunnel steel arch frame clamp ruler according to claim 4, characterized in that, The hollow support column (7) is provided with a fixing block (12) at its top. The fixing block (12) is connected to the horizontal crossbar (1). The hollow support column (7) can rotate relative to the fixing block (12). The fixing block (12) is provided with a first side block (13), and the hollow support column (7) is provided with a second side block (14). The first side block (13) is located above the second side block (14). The first side block (13) and the second side block (14) are connected by a vertical stud (15). The vertical stud (15) is configured to restrict the hollow support column (7) from being perpendicular to the horizontal bar (1).

7. A tunnel steel arch frame clamp ruler according to claim 1, characterized in that, The extension rod (3) includes a first extension rod (16) and a second extension rod (17). The first extension rod (16) and the second extension rod (17) are respectively disposed on both sides of the first receiving groove (2) and both can slide axially within the first receiving groove (2). The horizontal crossbar (1) is provided with a second fastening bolt (18) and a third fastening bolt (19) on both sides. The second fastening bolt (18) is configured to abut against the first extension rod (16) by screw adjustment and to axially limit the first extension rod (16) in the first receiving groove (2). The third fastening bolt (19) is configured to abut against the second extension rod (17) by screw adjustment and to axially limit the second extension rod (17) in the first receiving groove (2).

8. A tunnel steel arch frame clamp ruler according to claim 7, characterized in that, The first extension rod (16) has a second receiving groove (20) axially arranged inside, and the second extension rod (17) is arranged in the second receiving groove (20) and can move axially along the second receiving groove (20); The second extension rod (17) can be hidden in the second receiving groove (20), and the first extension rod (16) can be hidden in the first receiving groove (2).

9. A tunnel steel arch frame clamp ruler according to claim 8, characterized in that, The scale lines include a first scale line (21) on the first extension rod (16) and a second scale line (22) on the second extension rod (17). A limiting plate (23) is provided at one end of the first extension rod (16) that is inserted into the first receiving groove (2). The limiting plate (23) is used to prevent the first extension rod (16) from disengaging from the first receiving groove (2).

10. A tunnel steel arch frame clamp ruler according to claim 8, characterized in that, The other end of the first extension rod (16) inserted into the first receiving groove (2) is provided with a first bonding plate (24), and the other end of the second extension rod (17) inserted into the second receiving groove (20) is provided with a second bonding plate (25). The cross-sections of the first bonding plate (24) and the second bonding plate (25) are larger than the cross-section of the horizontal bar (1). The outer sides of both the first bonding plate (24) and the second bonding plate (25) are provided with anti-slip texture (26).

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