Steel arch installation auxiliary device for tunnel construction

Abstract

The application discloses a kind of steel arch installation auxiliary devices for tunnel construction, including transverse support mechanism, lifting mechanism, arc support, the lifting mechanism is installed in the top of transverse support mechanism, the arc support is installed in lifting mechanism, vertical support mechanism is installed on arc support and adjusting support mechanism is installed in the both sides of vertical support mechanism, limit mechanism is also installed on arc support, the limit mechanism is matched with adjusting support mechanism.The application can support steel arch of different sizes, ensure the efficiency of steel arch installation, transverse support mechanism can entire device, vertical support mechanism and adjusting support mechanism are used to support steel arch, ensure that steel arch can be in close contact with the inner wall of tunnel, and adjusting support mechanism can support the specified position of steel arch according to need, ensure the installation quality of steel arch, adjusting mechanism can limit adjusting support mechanism after adjusting, ensure the normal work of adjusting support mechanism.

Description

Technical Field

[0001] This invention belongs to the field of tunnel construction technology, and specifically relates to an auxiliary device for installing steel arch frames in tunnel construction. Background Technology

[0002] With the booming development of my country's infrastructure industry, a large number of tunnel projects have emerged, and tunnel projects often become key projects affecting the progress of the entire project. With the improvement of tunnel construction technology, mechanized construction has become the development trend of tunnel construction. In the field of tunnel construction, mechanized construction can not only improve work efficiency, increase safety factor, improve working environment, and reduce work intensity, but also ensure project quality and effectively save resources, and is gradually replacing the traditional, extensive "human wave tactics".

[0003] The manual installation of steel arch frames in tunnel construction is labor-intensive, inefficient, and cannot guarantee the safety of construction workers. While existing steel arch frame installation auxiliary devices can improve work efficiency and reduce labor intensity, they can only meet the requirements of tunnels of specific sizes. Beyond the applicable range, the arch frame installation auxiliary devices need to be modified. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an auxiliary device for installing steel arch frames in tunnel construction. This device can support steel arch frames of different sizes, ensuring the efficiency of steel arch frame installation. The horizontal support mechanism supports the entire device, while the vertical support mechanism and the adjusting support mechanism support the steel arch frames, ensuring that the steel arch frames can be in close contact with the inner wall of the tunnel. The adjusting support mechanism can support the steel arch frames at designated positions as needed, ensuring the installation quality of the steel arch frames. The adjusting mechanism can limit the adjusted support mechanism after adjustment, ensuring the normal operation of the adjusting support mechanism.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An auxiliary device for installing a steel arch frame in tunnel construction includes a horizontal support mechanism, a lifting mechanism, and an arc-shaped bracket. The lifting mechanism is installed on top of the horizontal support mechanism, and the arc-shaped bracket is installed on the lifting mechanism. A vertical support mechanism and an adjusting support mechanism are installed on both sides of the vertical support mechanism on the arc-shaped bracket. A limiting mechanism is also installed on the arc-shaped bracket, and the limiting mechanism cooperates with the adjusting support mechanism.

[0007] Preferably, the transverse support mechanism includes a fixed shell, gears, a motor, a first support plate, and a second support plate. The fixed shell has a cavity structure. The first and second support plates are symmetrically installed inside the fixed shell. Racks are provided on the inner sides of the first and second support plates, and the other ends of the first and second support plates extend through the side wall of the fixed shell to the outer side of the fixed shell. The motor is installed at the bottom of the fixed shell, and the output shaft of the motor extends through the bottom of the fixed shell to the inside of the fixed shell. The gear is located inside the fixed shell and installed on the output shaft of the motor. The gear meshes with the racks on the first and second support plates respectively. A first limiting member is fixedly installed at the other end of the first and second support plates. The transverse support mechanism can fix the two ends of the steel arch frame, support the steel arch frame on the inner wall of the tunnel, achieve the purpose of supporting the steel arch frame, prevent the steel arch frame from falling and injuring workers during the installation process, and improve the installation efficiency of the steel arch frame.

[0008] Preferably, the first limiting member includes a base plate and side plates installed on both sides of the base plate. The base plate and the side plates on both sides of the base plate form a groove-shaped structure with openings at both ends. The first limiting member is used to hold the ends of the steel arch frame to ensure the stability of the steel arch frame during installation, prevent the steel arch frame from shaking during installation, and ensure the installation efficiency of the steel arch frame.

[0009] Preferably, the lifting mechanism is a scissor-type lifting mechanism, which is used to lift the arc-shaped support to ensure that the vertical support mechanism and the adjusting support mechanism can provide support for the steel arch frame, thus ensuring the installation efficiency of the steel arch frame.

[0010] Preferably, the arc-shaped support includes a fixed plate and an arc-shaped plate. Two arc-shaped plates are provided and symmetrically installed on both sides of the fixed plate. An arc-shaped groove is opened in the middle of the arc-shaped plate, and a limiting groove is opened at the lower edge of the arc-shaped groove. The limiting groove cooperates with a limiting mechanism. Multiple limiting grooves are provided and evenly distributed on the arc-shaped groove. The arc-shaped support facilitates the support of the vertical support mechanism and the adjustment of the support mechanism. It also facilitates the adjustment of the rotation angle of the support mechanism, ensuring that the fixed-point support of the steel arch frame can be achieved by adjusting the support mechanism, thus ensuring the support quality and support efficiency of the steel arch frame.

[0011] Preferably, the limiting mechanism includes a limiting plate, a connecting plate, a baffle, and a support block. One end of the connecting plate is fixedly mounted on the limiting plate, and the other end of the connecting plate is fixedly mounted on the baffle. A strip groove is formed on the connecting plate, and a slider is provided in the strip groove. A telescopic rod is installed on the slider, and the other end of the telescopic rod is installed at the bottom of the support block. A spring is sleeved on the telescopic rod, and one end of the spring is installed at the top of the slider and the other end is installed at the bottom of the support block. A notch is formed in the middle of the support block, and the notch cooperates with one of the arc-shaped plates. A pressing block is installed on the support block. The limiting mechanism is used to restrict the rotation of the adjusting support mechanism, ensuring that the adjusting support mechanism can support the adjusting support mechanism after rotating at an angle, thus ensuring the support of the adjusting support mechanism for the steel arch frame and improving the installation efficiency and quality of the steel arch frame.

[0012] Preferably, the vertical support mechanism includes a mounting base, a first sleeve, a first support rod, and a first cylinder. The bottom of the first sleeve is fixedly mounted on the mounting base, and a sliding groove is formed on the side of the first sleeve. One end of the first support rod is located inside the first sleeve, and the other end extends above the first sleeve. A fixing rod is mounted on the first support rod, and both ends of the fixing rod extend through the sliding groove to the outside of the sliding groove. The first cylinder is mounted on the outside of the first sleeve on the fixing plate, and the other end of the piston rod of the first cylinder is mounted on the fixing rod. A second limiting member is mounted on the top of the first support rod. The vertical support mechanism is used to support the top of the steel arch frame and ensure the stability of the steel arch frame. The second limiting member is used to lock the steel arch frame and ensure the installation quality and efficiency of the steel arch frame.

[0013] Preferably, the adjusting support mechanism includes a second sleeve, a second support rod, and a second cylinder. The bottom of the second sleeve is rotatably mounted on the side of the mounting base. A fixing groove is formed on the side of the second sleeve. The second support rod is disposed inside the second sleeve. A fixing block is installed at the bottom of the second support rod. The fixing block extends through the fixing groove to the outside of the fixing groove. The second cylinder is fixedly mounted on the top side of the second sleeve. The piston rod of the second cylinder is fixedly mounted on the fixing block. A third limiting member is installed on the top of the second support rod. The adjusting support mechanism is used to support specific positions of the steel arch frame as needed, ensuring the installation quality of the steel arch frame and improving the installation efficiency of the steel arch frame.

[0014] Preferably, the second limiting member and the third limiting member have the same structure, which facilitates subsequent maintenance and replacement.

[0015] The beneficial effects of this invention are:

[0016] 1) This device can support steel arches of different sizes, ensuring the efficiency of steel arch installation. The horizontal support mechanism supports the entire device, while the vertical support mechanism and the adjusting support mechanism support the steel arches, ensuring that the steel arches can be in close contact with the inner wall of the tunnel. The adjusting support mechanism can support the steel arches at designated positions as needed, ensuring the installation quality of the steel arches. The adjusting mechanism can limit the adjusted support mechanism to ensure its normal operation.

[0017] 2) The transverse support mechanism in this device can fix the two ends of the steel arch frame and support the steel arch frame on the inner wall of the tunnel, thereby achieving the purpose of supporting the steel arch frame, preventing the steel arch frame from falling and injuring workers during the installation process, and improving the installation efficiency of the steel arch frame.

[0018] 3) The first limiting component in this device includes a base plate and side plates installed on both sides of the base plate. The base plate and the side plates installed on both sides of the base plate form a groove-shaped structure with openings at both ends. The first limiting component is used to hold the ends of the steel arch frame to ensure the stability of the steel arch frame during installation, prevent the steel arch frame from shaking during the installation process, and ensure the installation efficiency of the steel arch frame.

[0019] 4) The lifting mechanism in this device is a scissor lifting mechanism. The lifting mechanism is used to lift the arc-shaped support, ensuring that the vertical support mechanism and the adjustable support mechanism can provide support for the steel arch frame, thus ensuring the installation efficiency of the steel arch frame.

[0020] 5) The arc-shaped bracket in this device facilitates the support of the vertical support mechanism and the adjustment of the support mechanism. It also makes it easy to adjust the rotation angle of the support mechanism, ensuring that the steel arch frame can be fixedly supported by adjusting the support mechanism, thus ensuring the support quality and efficiency of the steel arch frame.

[0021] 6) The limiting mechanism in this device is used to limit the rotation of the adjusting support mechanism, ensuring that the adjusting support mechanism can support the adjusting support mechanism after rotating at the specified angle, thus ensuring the support of the adjusting support mechanism on the steel arch frame and improving the installation efficiency and quality of the steel arch frame.

[0022] 7) In this device, the vertical support mechanism is used to support the top of the steel arch frame to ensure the stability of the steel arch frame, and the second limiting member is used to lock the steel arch frame to ensure the installation quality and efficiency of the steel arch frame.

[0023] 8) The adjustable support mechanism in this device is used to support the steel arch frame at specific positions as needed, ensuring the installation quality of the steel arch frame and improving the installation efficiency of the steel arch frame.

[0024] 9) The second and third limiting components in this device have the same structure, which facilitates subsequent maintenance and replacement. Attached Figure Description

[0025] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Appendix Figure 2 This is a schematic diagram of the transverse support mechanism in this invention.

[0027] Appendix Figure 3 This is a schematic diagram of the arc-shaped support structure in this invention.

[0028] Appendix Figure 4 This is a schematic diagram of the adjusting support mechanism in this invention.

[0029] Appendix Figure 5 This is a schematic diagram of the vertical support mechanism in this invention.

[0030] Appendix Figure 6 This is a schematic diagram of the limiting mechanism in this invention.

[0031] Appendix Figure 7 This is a schematic diagram of the working structure of the present invention.

[0032] In the diagram: 1. Lateral support mechanism; 101. First limiting component; 102. First support plate; 103. Rack; 104. Gear; 105. Fixed shell; 106. Motor; 2. Lifting mechanism; 3. Arc-shaped bracket; 301. Fixed plate; 302. Arc-shaped plate; 303. Limiting groove; 304. Arc-shaped groove; 4. Adjustable support mechanism; 401. Fixed block; 402. Second sleeve; 403. Second cylinder; 404. Second support rod; 405. Fixed groove; 40 6. Third limiting component; 5. Vertical support mechanism; 501. First cylinder; 502. First sleeve; 503. Slide groove; 504. Second limiting component; 505. First support rod; 506. Fixed rod; 507. Mounting base; 6. Limiting mechanism; 601. Connecting plate; 602. Limiting plate; 603. Strip groove; 604. Notch; 605. Support block; 606. Pressing block; 607. Baffle; 608. Spring; 609. Telescopic rod; 6010. Slider. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-7 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] An auxiliary device for installing a steel arch frame in tunnel construction includes a horizontal support mechanism 1, a lifting mechanism 2, and an arc-shaped bracket 3. The lifting mechanism 2 is installed on top of the horizontal support mechanism 1, and the arc-shaped bracket 3 is installed on the lifting mechanism 2. A vertical support mechanism 5 and an adjusting support mechanism 4 are installed on both sides of the vertical support mechanism 5. A limiting mechanism 6 is also installed on the arc-shaped bracket 3, and the limiting mechanism 6 cooperates with the adjusting support mechanism 4.

[0036] The transverse support mechanism 1 includes a fixed housing 105, a gear 104, a motor 106, a first support plate 102, and a second support plate. The fixed housing 105 has an internal cavity structure. The first support plate 102 and the second support plate are symmetrically installed inside the fixed housing 105. A rack 103 is provided on the inner side of the first support plate 102 and the second support plate, and the other end of the first support plate 102 and the second support plate extends through the side wall of the fixed housing 105 to the outer side of the fixed housing 105. The motor 106 is installed at the bottom of the fixed housing 105, and the output shaft of the motor 106 passes through the fixed housing 105. The bottom of the fixed shell 105 extends into the interior of the fixed shell 105. The gear 104 is located inside the fixed shell 105 and is mounted on the output shaft of the motor 106. The gear 104 meshes with the rack 103 on the first support plate 102 and the second support plate, respectively. A first limiting member 101 is fixedly installed at the other end of the first support plate 102 and the second support plate. The transverse support mechanism 1 can fix the two ends of the steel arch frame and support the steel arch frame on the inner wall of the tunnel, thereby achieving the purpose of supporting the steel arch frame, preventing the steel arch frame from falling and injuring workers during the installation process, and improving the installation efficiency of the steel arch frame.

[0037] The first support plate 102 has the same structure as the second support plate.

[0038] During operation, the motor 106 is turned on as needed to drive the gear 104 to rotate. The gear 104 meshes with the rack 103, and the gear 104 drives the rack 103 to move, which in turn drives the first support plate 102 and the second support plate to move to both sides until the first limiting piece 101 on the first support plate 102 and the second support plate contacts the steel arch frame and presses the steel arch frame tightly against the tunnel wall.

[0039] The first limiting member 101 includes a base plate and side plates installed on both sides of the base plate. The base plate and the side plates installed on both sides of the base plate form a groove-shaped structure with openings at both ends. The first limiting member 101 is used to hold the end of the steel arch frame to ensure the stability of the steel arch frame during installation, prevent the steel arch frame from shaking during installation, and ensure the installation efficiency of the steel arch frame.

[0040] The lifting mechanism 2 is a scissor-type lifting mechanism. The lifting mechanism 2 is used to lift the arc-shaped support 3 to ensure that the vertical support mechanism 5 and the adjusting support mechanism 4 can provide support for the steel arch frame, thus ensuring the installation efficiency of the steel arch frame.

[0041] The arc-shaped support 3 includes a fixed plate 301 and an arc-shaped plate 302. Two arc-shaped plates 302 are provided and symmetrically installed on both sides of the fixed plate 301. An arc-shaped groove 304 is opened in the middle of the arc-shaped plate 302. A limiting groove 303 is opened at the lower edge of the arc-shaped groove 304. The limiting groove 303 cooperates with the limiting mechanism 6. Multiple limiting grooves 303 are provided and evenly distributed on the arc-shaped groove 304. The arc-shaped support 3 is designed to facilitate the support of the vertical support mechanism 5 and the adjustment of the support mechanism 4, and to facilitate the adjustment of the rotation angle of the support mechanism 4. This ensures that the steel arch frame can be fixedly supported by adjusting the support mechanism 4, thus ensuring the support quality and efficiency of the steel arch frame.

[0042] The limiting mechanism 6 includes a limiting plate 602, a connecting plate 601, a baffle 607, and a support block 605. One end of the connecting plate 601 is fixedly installed on the limiting plate 602, and the other end of the connecting plate 601 is fixedly installed on the baffle 607. A strip groove 603 is formed in the connecting plate 601, and a slider 6010 is provided in the strip groove 603. A telescopic rod 609 is installed on the slider 6010, and the other end of the telescopic rod 609 is installed at the bottom of the support block 605. A spring 608 is sleeved on the telescopic rod 609. One end of 608 is installed on the top of slider 6010, and the other end is installed on the bottom of support block 605. The support block 605 has a notch 604 in the middle, which cooperates with one of the arc plates 302. A pressing block 606 is installed on support block 605. Limiting mechanism 6 is used to limit the rotation of adjustment support mechanism 4, ensuring that after the adjustment support mechanism 4 rotates, it can still support the adjustment support mechanism 4, thus ensuring the support of the adjustment support mechanism 4 for the steel arch frame and improving the installation efficiency and quality of the steel arch frame.

[0043] During operation, first press the pressing block 606 to compress the telescopic rod 609 and the spring 608, then push the connecting plate 601 upwards to push it into the strip groove 603. If necessary, move the limiting plate 602 to the corresponding limiting groove 303, then place the connecting plate 601 in the limiting groove 303, stop pressing the pressing block 606, and then push the pressing block 606 inwards to ensure that the support block 605 contacts the arc plate 302, thereby achieving the purpose of fixing the connecting plate 601 and ensuring the stability of the connecting plate 601, thus ensuring the stability of the adjusting support mechanism 4. After the operation is completed, press the pressing block 606 downwards and then push the support block 605 outwards so that the notch 604 on the support block 605 cooperates with one of the arc plates 302, thereby releasing the restriction on the limiting mechanism 6.

[0044] The vertical support mechanism 5 includes a mounting base 507, a first sleeve 502, a first support rod 505, and a first cylinder 501. The bottom of the first sleeve 502 is fixedly mounted on the mounting base 507. A sliding groove 503 is formed on the side of the first sleeve 502. One end of the first support rod 505 is located inside the first sleeve 502, and the other end extends above the first sleeve 502. A fixing rod 506 is mounted on the first support rod 505. The two ends of the fixing rod 506 extend through the slide groove 503 to the outside of the slide groove 503. The first cylinder 501 is installed on the outside of the first sleeve 502 on the fixing plate 301, and the other end of the piston rod of the first cylinder 501 is installed on the fixing rod 506. A second limiting member 504 is installed on the top of the first support rod 505. The vertical support mechanism 5 is used to support the top of the steel arch frame to ensure the stability of the steel arch frame. The second limiting member 504 is used to lock the steel arch frame to ensure the installation quality and installation efficiency of the steel arch frame.

[0045] During operation, the first cylinder 501 pushes the first support rod 505 upward, so that the top of the first support rod 505 contacts the steel arch frame, thereby achieving the purpose of supporting the steel arch frame.

[0046] The adjusting support mechanism 4 includes a second sleeve 402, a second support rod 404, and a second cylinder 403. The bottom of the second sleeve 402 is rotatably mounted on the side of the mounting base 507. A fixing groove 405 is opened on the side of the second sleeve 402. The second support rod 404 is located inside the second sleeve 402. A fixing block 401 is installed at the bottom of the second support rod 404. The fixing block 401 extends through the fixing groove 405 to the outside of the fixing groove 405. The second cylinder 403 is fixedly mounted on the top side of the second sleeve 402. The piston rod of the second cylinder 403 is fixedly mounted on the fixing block 401. A third limiting member 406 is installed on the top of the second support rod 404. The adjusting support mechanism 4 is used to support specific positions of the steel arch frame as needed, ensuring the installation quality of the steel arch frame and improving the installation efficiency of the steel arch frame.

[0047] During operation, the second sleeve 402 rotates around its bottom end at an angle as needed, and is then restricted by the limiting mechanism 6. The second cylinder 403 is then opened, causing the second support rod 404 to move upward until the third limiting piece 406 contacts the steel arch frame, thereby supporting the steel arch frame and ensuring the installation quality and efficiency of the steel arch frame.

[0048] The second limiting member 504 and the third limiting member 406 have the same structure, which facilitates subsequent maintenance and later replacement.

[0049] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An auxiliary device for installing steel arch frames in tunnel construction, characterized in that, The system includes a horizontal support mechanism, a lifting mechanism, and an arc-shaped bracket. The lifting mechanism is mounted on top of the horizontal support mechanism, and the arc-shaped bracket is mounted on the lifting mechanism. A vertical support mechanism and adjusting support mechanisms on both sides of the vertical support mechanism are mounted on the arc-shaped bracket. A limit mechanism is also mounted on the arc-shaped bracket, which cooperates with the adjusting support mechanism. The horizontal support mechanism includes a fixed shell, gears, a motor, a first support plate, and a second support plate. The fixed shell has a cavity structure. The first and second support plates are symmetrically mounted inside the fixed shell. Racks are provided on the inner sides of the first and second support plates, and the other ends of the first and second support plates extend through the side wall of the fixed shell to the outer side of the fixed shell. The motor is mounted at the bottom of the fixed shell. The output shaft extends through the bottom of the fixed housing and into the interior of the fixed housing. The gear is located inside the fixed housing and mounted on the output shaft of the motor. The gear meshes with the racks on the first support plate and the second support plate, respectively. A first limiting member is fixedly installed at the other end of the first support plate and the second support plate. The first limiting member includes a base plate and side plates installed on both sides of the base plate. The base plate and the side plates on both sides of the base plate form a groove structure with openings at both ends. The lifting mechanism is a scissor lifting mechanism. The arc-shaped bracket includes a fixed plate and an arc-shaped plate. There are two arc-shaped plates, which are symmetrically installed on both sides of the fixed plate. An arc-shaped groove is opened in the middle of the arc-shaped plate. A limiting groove is opened at the lower edge of the arc-shaped groove. The limiting groove cooperates with the limiting mechanism. There are multiple limiting grooves, which are evenly distributed on the arc-shaped groove.

2. The auxiliary device for installing steel arch frames in tunnel construction according to claim 1, characterized in that, The limiting mechanism includes a limiting plate, a connecting plate, a baffle, and a support block. One end of the connecting plate is fixedly mounted on the limiting plate, and the other end of the connecting plate is fixedly mounted on the baffle. A strip groove is formed on the connecting plate, and a slider is provided in the strip groove. A telescopic rod is installed on the slider, and the other end of the telescopic rod is installed at the bottom of the support block. A spring is sleeved on the telescopic rod, and one end of the spring is installed at the top of the slider and the other end is installed at the bottom of the support block. A notch is formed in the middle of the support block, and the notch cooperates with one of the arc-shaped plates. A pressing block is installed on the support block.

3. The auxiliary device for installing steel arch frames in tunnel construction according to claim 1, characterized in that, The vertical support mechanism includes a mounting base, a first sleeve, a first support rod, and a first cylinder. The bottom of the first sleeve is fixedly mounted on the mounting base. A sliding groove is formed on the side of the first sleeve. One end of the first support rod is located inside the first sleeve, and the other end extends above the first sleeve. A fixing rod is mounted on the first support rod. The fixing rod is mounted on the first support rod, and both ends of the fixing rod extend through the sliding groove to the outside of the sliding groove. The first cylinder is mounted on the outside of the first sleeve on the fixing plate, and the other end of the piston rod of the first cylinder is mounted on the fixing rod. A second limiting member is mounted on the top of the first support rod.

4. The auxiliary device for installing steel arch frames in tunnel construction according to claim 3, characterized in that, The adjusting support mechanism includes a second sleeve, a second support rod, and a second cylinder. The bottom of the second sleeve is rotatably mounted on the side of the mounting base. A fixing groove is opened on the side of the second sleeve. The second support rod is located inside the second sleeve. A fixing block is installed at the bottom of the second support rod. The fixing block extends through the fixing groove to the outside of the fixing groove. The second cylinder is fixedly mounted on the top side of the second sleeve. The piston rod of the second cylinder is fixedly mounted on the fixing block. A third limiting member is installed on the top of the second support rod.

5. The auxiliary device for installing steel arch frames in tunnel construction according to claim 4, characterized in that, The second limiting member has the same structure as the third limiting member.

Images