Tunnel construction inverted arch low side wall joint stub steel fixing auxiliary device

Abstract

The present application relates to tunnel construction inverted arch low side wall joint stub steel fixing auxiliary device, including a fixed seat, the bottom surface of fixed seat is provided with four fixed arms, four fixed arms are evenly arranged in the bottom surface of fixed seat with the center of fixed seat as the center, the inner end of fixed arm is rotatably connected to the outside of the bottom surface of fixed seat, the inner end of fixed arm is rotatably connected to the outside of the bottom surface of fixed seat, the inner end of fixed arm is rotatably connected to the outside of the bottom surface of fixed seat, the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the outer end of adjusting arm is extended to the outside of the outer end of fixed arm, and the

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction auxiliary equipment, in particular to a tunnel construction inverted arch low side wall jointing stub reinforcement fixing auxiliary device. BACKGROUND

[0002] The construction quality of the tunnel inverted arch low side wall directly affects the quality of the secondary lining.

[0003] The low side wall construction process flow includes draining accumulated water, measuring and laying out, removing low side wall foundation virtual debris, installing longitudinal ring drainage pipes, cutting off the outer leakage steel bar head, hanging geotextile and waterproof board and back sticking water stop belt, erecting low side wall foundation formwork, correcting and reinforcing formwork, applying release agent, pouring concrete, vibrating and tamping, placing jointing stub reinforcement water stop strip reserved groove, removing formwork, curing and watering maintenance. The jointing stub reinforcement is generally placed one hour after the concrete is poured. The jointing stub reinforcement is double-row steel bars arranged alternately, and the size of the steel bars, the distance between the steel bars, and the length of the steel bars exposed and inserted into the concrete are strictly regulated.

[0004] One of the requirements is that the embedded jointing stub reinforcement can achieve uniform exposed height, straight line type, and uniform spacing. In actual construction, the steel bars are mostly square or rectangular in distribution, and the exposed height of the steel bars and the distance between the steel bars mostly need to be determined by people using a ruler. It is difficult to avoid the movement and skewing of the steel bars after measurement, and it is difficult to avoid the phenomena of skewing, uneven exposure, uneven spacing, and straight line type of the jointing stub reinforcement after embedding. SUMMARY

[0005] To solve the above problems, the purpose of the present application is to provide a tunnel construction inverted arch low side wall jointing stub reinforcement fixing auxiliary device, which can quickly fix the tunnel construction inverted arch low side wall jointing stub reinforcement, accurately control the distance between multiple steel bars, and ensure the straightness of the steel bars.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] The application discloses a tunnel construction inverted arch low side wall jointing stub steel fixing auxiliary device, which comprises a fixing seat, four fixing arms arranged uniformly on the bottom surface of the fixing seat and centered on the center of the fixing seat, the inner ends of the fixing arms being rotatably connected to the outer side of the bottom surface of the fixing seat, an adjusting arm being slidably nested in the fixing arm, an adjusting screw being threadedly connected to the outer end of the adjusting arm, the adjusting screws on the adjusting arms being driven to rotate synchronously by a length adjusting mechanism so as to drive the adjusting arms to synchronously extend or retract into the fixing arms, two adjacent fixing arms and the other two fixing arms being synchronously adjusted and fixed by an angle adjusting mechanism, and the top surfaces of the positioning grooves for accommodating the jointing stub steels in the positioning seats being flush.

[0008] As one of the embodiments, the length adjusting mechanism comprises upper small bevel gears connected with the adjusting screws, each of the upper small bevel gears is engaged with an upper large bevel gear, and the upper large bevel gear is rotated to drive each of the upper small bevel gears to synchronously rotate.

[0009] As one of the embodiments, the adjusting screw is connected with the adjusting rotating shaft of the fixing upper small bevel gear through a connecting rod, and the connecting rod is connected with the adjusting screw and the adjusting rotating shaft through universal coupling joints at both ends.

[0010] As one of the embodiments, the angle adjusting mechanism comprises a sliding plate between the adjacent pair of fixing arms, the sliding plate is hingedly connected with a sliding plate rotating plate adjacent to the end of the fixing arm, the sliding plate rotating plate is hingedly connected with a fixing seat rotating plate fixed to the inner end of the fixing arm, a sliding plate screw is threadedly connected to the middle part of the sliding plate, lower small bevel gears are fixedly connected to the inner ends of the sliding plate screw, two lower small bevel gears are engaged with a lower large bevel gear, the lower large bevel gear is rotated to drive the two lower small bevel gears to synchronously rotate, and the two sliding plates are synchronously moved in and out to synchronously adjust the angle between the two fixing arms of the two pairs of fixing arms.

[0011] As one of the embodiments, the upper large bevel gear and the lower large bevel gear are both sleeved on a longitudinal rotating rod, an upper outer gear ring and a lower outer gear ring are sequentially arranged on the rotating rod from top to bottom, an upper inner gear ring with internal teeth and cooperating with the upper outer gear ring is arranged in the center of the upper large bevel gear, a lower inner gear ring with internal teeth and cooperating with the lower outer gear ring is arranged in the center of the lower large bevel gear, and the upper outer gear ring on the rotating rod is engaged with the upper inner gear ring or the lower outer gear ring is engaged with the lower inner gear ring by moving the rotating rod up and down.

[0012] As one of the implementation forms, the rotating rod is fixedly connected with a longitudinal rotating handle, the rotating handle is slidingly sleeved in a fixed sleeve fixed on the top surface of the fixed base, a plurality of annular grooves are arranged on the rotating handle from top to bottom, and a movable pull rod is arranged on the fixed sleeve and matched with the annular grooves.

[0013] As one of the implementation forms, the rotating handle is slidingly sleeved in a longitudinal stepped hole of the fixed sleeve, the lower part of the rotating handle is sleeved with a rotating handle spring, the upper end of the rotating handle spring is connected with the wall of the longitudinal stepped hole, and the lower end of the rotating handle spring is connected with the bottom of the rotating handle.

[0014] As one of the implementation forms, the pull rod is slidingly sleeved in a transverse stepped hole on the fixed sleeve, the inner end of the pull rod is sleeved with a pull rod spring, the outer end of the pull rod spring is connected with the inner wall of the transverse stepped hole, the inner end of the pull rod spring is connected with the inner end of the pull rod, the inner end of the pull rod is matched with the annular groove of the rotating handle, and the pull rod spring is arranged to always match the inner end of the pull rod with the annular groove of the rotating handle under the condition that no external force is applied.

[0015] As one of the implementation forms, the bottom surface of the fixed base is provided with a downwardly protruding central base, the central base has a cavity in the inside, transverse mounting holes are arranged on the longitudinal side wall of the central base and correspond to the positions of the adjusting screws, respectively, and the adjusting shafts are rotatably arranged in the mounting holes; the upper large bevel gear is rotatably connected with the top wall of the cavity of the central base, the lower large bevel gear is rotatably connected with the bottom wall of the cavity of the central base, and the bottom wall of the central base is provided with a slot hole corresponding to the position of the rotating rod.

[0016] As one of the implementation forms, the front and rear sides of the positioning groove are respectively provided with clamping plates, the clamping plate on the front side is connected with a positioning screw, the positioning screw is fixedly connected with a handle after penetrating through a positioning screw hole arranged on the positioning base, the left and right sides of each clamping plate are respectively fixed with a sliding block, the sliding blocks are slidingly matched with a sliding groove arranged in the positioning groove in the front-rear direction, a positioning spring connecting the two sliding blocks is arranged between the two sliding blocks on the same side of the left and right sides of the two clamping plates, one end of a pull rope connected with the rear side sliding block, and the other end of the pull rope penetrates through a through hole arranged on the front side sliding block, winds around a rotatable rotating rod fixed on the front side positioning base, and is fixed on the front side sliding block.

[0017] The present application has the following beneficial effects:

[0018] The present application can quickly fix a plurality of steel bars, accurately control the distance between the steel bars, ensure the straightness of the steel bars, and avoid the phenomenon that the embedded steel bars are inclined, exposed, have different distances, and have an uneven line type. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application from the top surface;

[0020] Figure 2 isometric view of the present application from the bottom;

[0021] Figure 3 isometric view of the present application from the top;

[0022] Figure 4 isometric view of the present application from the bottom; Figure 3 isometric view of the present application from the bottom;

[0023] Figure 5 isometric view of the present application from the bottom; Figure 4 isometric view of the present application from the bottom;

[0024] Figure 6 isometric view of the present application from the bottom; Figure 3 isometric view of the present application from the bottom;

[0025] Figure 7 isometric view of the present application from the bottom; Figure 6 isometric view of the present application from the bottom;

[0026] Figure 8 isometric view of the present application from the bottom. DETAILED DESCRIPTION

[0027] The present application will be further described in conjunction with the accompanying drawings and specific embodiments:

[0028] Referring to Figures 1 to 8 , the tunnel construction inverted arch low side wall joint stub reinforcing bar fixing auxiliary device comprises a fixing seat 1, the cross-sectional shape of the fixing seat 1 is preferably square. A downwardly protruding center seat 11 is arranged at the center of the bottom surface of the fixing seat 1, and the center seat 11 has a cavity inside. Downwardly protruding side seats 12 are arranged around the bottom surface of the fixing seat 1.

[0029] Four fixing arms 21 are arranged on the bottom surface of the fixing seat 1, and the four fixing arms 21 are uniformly arranged on the bottom surface of the fixing seat 1 with the center of the fixing seat 1 as the center. The inner end of the fixing arm 21 is rotationally connected to the outer side of the bottom surface of the fixing seat 1 through a fixing arm rotating shaft, and the outer end of the fixing arm 21 extends to the outside of the fixing seat 1. An inner cavity 211 extending along the length direction of the fixing arm 21 is arranged inside the fixing arm 21, the inner cavity 211 of the fixing arm 21 penetrates the outer end of the fixing arm 21, and an adjusting arm 22 is slidably nested in the inner cavity 211 of the fixing arm 21, the inner end of the adjusting arm 22 is located inside the fixing arm 21, and the outer end of the adjusting arm 22 extends to the outside of the fixing arm 21. A transverse screw hole 221 extending along the length direction of the adjusting arm 22 is arranged in the adjusting arm 22, the transverse screw hole 221 penetrates the inner end of the adjusting arm 22, and a transverse through hole extending along the length direction of the fixing arm 21 and penetrating the inner end of the fixing arm 21 is arranged in the fixing arm 21 corresponding to the transverse screw hole 221 of the adjusting arm 22.

[0030] The transverse screw hole 221 is screwed with an adjusting screw 31, the inner end of the adjusting screw 31 extends to the inner end of the fixed arm 21 through the transverse through hole of the fixed arm 21. The adjusting screw 31 in each adjusting arm 22 is driven to rotate synchronously by a length adjusting mechanism arranged in the central seat 11. The longitudinal side wall of the central seat 11 is provided with a transverse mounting hole corresponding to the position of each adjusting screw 31, the adjusting shaft 321 is rotatably mounted in the mounting hole through a rotating part such as a bearing, the outer end of the adjusting shaft 321 is axially provided with a square hole, a square shaft 322 is fixedly sleeved in the square hole, the square shaft 322 is connected with the adjusting screw 31 through a connecting rod 323, and the two ends of the connecting rod 323 are respectively connected with the adjusting screw 31 and the adjusting shaft 321 through universal joint connectors 324. The length adjusting mechanism comprises an upper small bevel gear 331 fixedly connected to the end of the adjusting shaft 321 extending into the cavity of the central seat 11, and each upper small bevel gear 331 is engaged with an upper large bevel gear 332 rotatably connected to the top wall of the cavity of the central seat 11. By rotating the upper large bevel gear 332, each upper small bevel gear 331 is driven to rotate synchronously, thereby driving the adjusting screw 31 in each adjusting arm 22 to rotate, so that the adjusting arm 22 is driven to synchronously extend out or retract into the fixed arm 21.

[0031] Two adjacent fixed arms 21 and the other two fixed arms 21 are respectively adjusted in angle by an angle adjusting mechanism. Specifically, the angle adjusting mechanism comprises a slide plate 41 located between the adjacent pair of fixed arms 21. The slide plate 41 is hinged with a slide plate rotating plate 421 adjacent to the end of the fixed arm 21, the slide plate rotating plate 421 is hinged with a fixed seat rotating plate 422 fixed to the inner end of the fixed arm 21, specifically, one end of the fixed seat rotating plate 422 is fixedly connected to the inner end of the fixed arm 21, and the other end is hinged with the slide plate rotating plate 421. The slide plate 41 is provided with a slide plate screw hole penetrating through the opposite two sides of the slide plate 41 along the bisector direction of the two fixed arms 21, the slide plate 41 is screwed with a slide plate screw 43, the outer end of the slide plate screw 43 is screwed on the side seat 12 corresponding to the side of the bottom surface of the fixed seat 1, the inner end of the slide plate screw 43 extends to the cavity of the central seat 11 through the slide plate 41 and the central seat 11 in sequence, and the inner end is fixedly connected with a lower small bevel gear 441, and the two lower small bevel gears 441 are engaged with a lower large bevel gear 442 rotatably connected to the bottom wall of the cavity of the central seat 11. By rotating the lower large bevel gear 442, the two lower small bevel gears 441 are driven to rotate synchronously, thereby driving the two slide plate screws 43 to rotate, and driving the two slide plates 41 to move synchronously to adjust the angle between the two pairs of fixed arms 21 synchronously.

[0032] The fixed seat 1 top surface center position is provided with a handle mechanism. The handle mechanism includes a fixed sleeve 51 fixed on the top surface of the fixed seat 1, the fixed sleeve 51 is provided with a longitudinal stepped hole 511 inside, and a handle 52 is slidably sleeved in the longitudinal stepped hole 511. The handle 52 is fixedly connected with a handlebar 521 at the top, and a plurality of annular grooves 522, specifically three, are arranged from top to bottom in the middle of the handle 52. The upper part of the fixed sleeve 51 is provided with a transverse stepped hole 512, the inner end of the transverse stepped hole 512 penetrates the longitudinal stepped hole 511, and a pull rod 53 is slidably sleeved in the transverse stepped hole 512, the outer end of the pull rod 53 extending out of the fixed sleeve 51 is fixedly connected with a pull plate 531, the inner end of the pull rod 53 is sleeved with a pull rod spring 532, the outer end of the pull rod spring 532 is connected to the inner wall of the transverse stepped hole 512, the inner end of the pull rod spring 532 is connected to the inner end of the pull rod 53, and the inner end of the pull rod 53 is clamped to the annular groove 522 of the handle 52. The pull rod spring 532 always clamps the inner end of the pull rod 53 to the annular groove 522 of the handle 52 without external force. The lower part of the handle 52 is sleeved with a handle spring 523, the upper end of the handle spring 523 is connected to the wall of the longitudinal stepped hole 511, and the lower end of the handle spring 523 is connected to the bottom of the handle 52. The bottom of the handle 52 is fixedly connected with a longitudinally arranged rotating rod 54, the rotating rod 54 penetrates through a longitudinal through hole in the fixed seat 1 and extends into the cavity of the center seat 11, the bottom and the bottom end of the rotating rod 54 are respectively provided with an upper outer gear ring 541 and a lower outer gear ring (not shown in the figure), the upper large bevel gear 332 and the lower large bevel gear 442 are sleeved on the rotating rod 54, the center of the upper large bevel gear 332 is provided with an upper inner gear ring 543 which is penetrated from top to bottom and has internal teeth and cooperates with the upper outer gear ring 541, and the center of the lower large bevel gear 442 is provided with a lower inner gear ring 544 which is penetrated from top to bottom and has internal teeth and cooperates with the lower outer gear ring. The bottom wall of the center seat 11 is provided with a slot hole 111 corresponding to the position of the rotating rod 54 to accommodate the bottom end of the rotating rod 54.

[0033] When the pull plate 531 is pulled outwards, the pull rod 53 is disengaged from the middle annular groove 522 of the handle 52, the handle 52 is moved upwards so that the middle annular groove 522 is aligned with the pull rod 53, the pull plate 531 is loosened so that the inner end of the pull rod 53 is inserted into the middle annular groove 522, at this time, the upper outer gear ring 541 of the rotating rod 54 is located below the upper bevel gear 332, the lower outer gear ring of the rotating rod 54 is inserted into the lower inner gear ring 544 of the lower bevel gear 442, the rotating handle 521 is rotated, the two sliding plates 41 are moved inwards or outwards through the meshing of the lower and upper bevel gears, thereby synchronously adjusting the angle of the two pairs of fixed arms 21. After the angle adjustment of the fixed arms 21 is completed, the pull plate 531 is pulled outwards again, the pull rod 53 is moved outwards and disengaged from the middle annular groove 522 of the handle 52, the handle 52 is moved upwards so that the bottom annular groove 522 is aligned with the pull rod 53, the pull plate 531 is loosened so that the inner end of the pull rod 53 is inserted into the bottom annular groove 522, at this time, the upper outer gear ring 541 of the rotating rod 54 is inserted into the upper inner gear ring 543 of the upper bevel gear 332, the lower outer gear ring of the rotating rod 54 is located above the lower bevel gear 442, the rotating handle 521 is rotated, the screw rod is rotated through the meshing of the upper and lower bevel gears, thereby synchronously adjusting the length of each adjusting arm 22 extending from the fixed arm 21, thereby forming a square or rectangle with different lengths matching the stub reinforcement at the end of the four adjusting arms 22.

[0034] Optionally, positioning holes 20 are arranged on the fixed arms 21 and the adjusting arms 22 respectively, so as to fix the two positions after adjustment by using bolts or the like.

[0035] Positioning seats 6 are fixed to the bottom surfaces of the fixed arms 21 and the adjusting arms 22 respectively. Positioning grooves 61 accommodating the top of the stub reinforcement are arranged in the positioning seats 6, and the top surfaces of the positioning grooves 61 of the positioning seats 6 of the fixed arms 21 and the positioning grooves 61 of the positioning seats 6 of the adjusting arms 22 are flush. Clamping plates 62 clamping the stub reinforcement are arranged on the front and rear side surfaces of the positioning grooves 61 respectively, and the clamping plate 62 on the front side is connected to a positioning screw 63, which is fixedly connected to a handle 631 after penetrating through a positioning screw hole arranged on the positioning seat 6. A sliding block 64 is fixed to the left and right sides of each clamping plate 62 respectively, and the sliding block 64 is in sliding cooperation with a sliding groove arranged in the positioning groove 61 in the front-rear direction. A positioning spring 65 connecting the two sliding blocks 64 is arranged between the two sliding blocks 64 on the same side of the left and right sides of the two clamping plates 62, and one end of a pull rope 66 is connected to the rear sliding block 64. The pull rope 66 is fixed to the front sliding block 64 after penetrating through a through hole of the front sliding block 64 and winding around a rotatable rotating rod 67 fixed to the front positioning seat 6. By rotating the positioning screw 63, the front clamping plate 62 is moved rearwards, and the rear clamping plate 62 is pulled forward through the pull rope 66 between the front and rear sliding blocks 64 on the same side, thereby clamping the stub reinforcement.

[0036] The above merely describes a specific embodiment of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, or direct or indirect application in other related technical fields, based on the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. An auxiliary device for fixing reinforcing bars at the joint of the short side wall of the tunnel invert arch, characterized in that: The application relates to a fixing base (1); four fixing arms (21) are arranged on the bottom surface of the fixing base (1) and are evenly arranged on the bottom surface of the fixing base (1) with the center of the fixing base (1) as the center; the inner end of the fixing arm (21) is rotationally connected to the outer side of the bottom surface of the fixing base (1); An adjusting arm (22) is slidably nested in the fixing arm (21), the outer end of the adjusting arm (22) extends to the outer end of the fixing arm (21), and the adjusting arm (22) is internally threadedly connected with an adjusting screw (31); the adjusting screws (31) on the adjusting arms (22) are driven to synchronously rotate by a length adjusting mechanism so as to drive the adjusting arms (22) to synchronously extend out of or retract into the fixing arms (21); the length adjusting mechanism comprises upper small bevel gears (331) connected with the adjusting screws (31); the upper small bevel gears (331) are meshed with an upper large bevel gear (332); Two adjacent fixing arms (21) and the other two fixing arms (21) are synchronously adjusted by an angle adjusting mechanism and the angle between the two fixing arms (21) of each pair of fixing arms (21) is fixed; the angle adjusting mechanism comprises a slide plate (41) located between the adjacent pair of fixing arms (21); the slide plate (41) is hingedly connected with a slide plate rotating plate (421) adjacent to the end of the fixing arm (21); the slide plate rotating plate (421) is hingedly connected with a fixing base rotating plate (422) fixed to the inner end of the fixing arm (21); the middle part of the slide plate (41) is threadedly connected with a slide plate screw (43); the inner end of the slide plate screw (43) is fixedly connected with lower small bevel gears (441); the two lower small bevel gears (441) are meshed with a lower large bevel gear (442); The upper large bevel gear (332) and the lower large bevel gear (442) are sleeved on a longitudinal rotating rod (54); the rotating rod (54) is sequentially provided with an upper outer gear ring (541) and a lower outer gear ring from top to bottom; the center of the upper large bevel gear (332) is provided with an upper inner gear ring (543) penetrating up and down and having internal teeth matched with the upper outer gear ring (541); the center of the lower large bevel gear (442) is provided with a lower inner gear ring (544) penetrating up and down and having internal teeth matched with the lower outer gear ring; the upper outer gear ring (541) on the rotating rod (54) is meshed with the upper inner gear ring (543) or the lower outer gear ring is meshed with the lower inner gear ring (544) by moving the rotating rod (54) up and down; The bottom surface of each fixing arm (21) and adjusting arm (22) is fixedly provided with a positioning base (6) fixedly connected with a reinforcing steel bar; the top surface of a positioning groove (61) in each positioning base (6) for containing the reinforcing steel bar is flush.

2. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 1, characterized in that: The adjusting screw (31) is connected with an adjusting rotating shaft (321) fixed with the upper small bevel gear (331) through a connecting rod (323); the two ends of the connecting rod (323) are respectively connected with the adjusting screw (31) and the adjusting rotating shaft (321) through universal coupling joints (324).

3. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 1, characterized in that: The rotating rod (54) is fixedly connected with a longitudinal rotating handle (52), the rotating handle (52) is slidingly sleeved in a fixed sleeve (51) fixed on the top surface of the fixed base (1), a plurality of annular grooves (522) are arranged on the rotating handle (52) from top to bottom, and the fixed sleeve (51) is provided with a pull rod (53) capable of moving in and out and matched with the annular grooves (522), the pull rod (53) is clamped in the annular grooves (522).

4. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 3, characterized in that: The rotating handle (52) is slidingly sleeved in a longitudinal stepped hole (511) of the fixed sleeve (51), the rotating handle (52) is sleeved with a rotating handle spring (523), the upper end of the rotating handle spring (523) is connected to the wall of the longitudinal stepped hole (511), and the lower end of the rotating handle spring (523) is connected to the bottom of the rotating handle (52).

5. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 3, characterized in that: The pull rod (53) is slidingly sleeved in a transverse stepped hole (512) of the fixed sleeve (51), the pull rod (53) is sleeved with a pull rod spring (532), the outer end of the pull rod spring (532) is connected to the inner wall of the transverse stepped hole (512), the inner end of the pull rod spring (532) is connected to the inner end of the pull rod (53), the inner end of the pull rod (53) is clamped in the annular groove (522) of the rotating handle (52), and the pull rod spring (532) always clamps the inner end of the pull rod (53) in the annular groove (522) of the rotating handle (52) without external force.

6. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 3, characterized in that: The bottom surface of the fixed base (1) is provided with a downwardly protruding central base (11) at the center, the central base (11) has a cavity inside, transverse mounting holes are arranged on the longitudinal side wall of the central base (11) at positions corresponding to the positions of the adjusting screws (31), respectively, and adjusting rotating shafts (321) are rotatably mounted in the mounting holes; an upper large bevel gear (332) is rotatably connected to the top wall of the cavity of the central base (11), a lower large bevel gear (442) is rotatably connected to the bottom wall of the cavity of the central base (11), and a slot hole (111) accommodating the bottom end of the rotating rod (54) is formed in the bottom wall of the central base (11) at a position corresponding to the position of the rotating rod (54).

7. The auxiliary device for fixing the joint bar of the inverted arch low sidewall of the tunnel construction according to claim 1, characterized in that: The positioning grooves (61) are provided with clamping plates (62) on the front and rear sides, respectively, the clamping plate (62) on the front side is connected with a positioning screw (63), the positioning screw (63) is fixedly connected with a handle (631) after penetrating through a positioning screw hole arranged on the positioning base (6), each clamping plate (62) is fixed with a sliding block (64) on the left and right sides, respectively, the sliding blocks (64) are slidingly matched with sliding grooves arranged in the positioning grooves (61) in the front and rear directions, a positioning spring (65) connecting the two sliding blocks (64) is arranged between the two sliding blocks (64) on the same side of the left and right sides of the two clamping plates (62), and one end of a pull rope (66) is connected to the rear sliding block (64), the other end of the pull rope (66) is fixed to the front sliding block (64) after penetrating through a through hole formed in the front sliding block (64) and winding around a rotatable rotating rod (67) fixed to the front positioning base (6).

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