Tunnel center drainage ditch cover plate cast-in-place bottom mold structure

Abstract

The application discloses a tunnel center drainage ditch cover plate cast-in-situ bottom die structure and belongs to the technical field of tunnel construction. The tunnel center drainage ditch cover plate cast-in-situ bottom die structure comprises a running device, a bottom die device and a bottom die lifting structure. The bottom die device comprises a steel die bottom die, an air bag bottom die and an air bag inflation and deflation structure. One pair of the bottom die lifting structures are fixedly installed on the running device. The steel die bottom die is installed on the bottom die lifting structure. Longitudinal steel grooves are arranged on the two sides of the steel die bottom die. The air bag bottom die is embeddedly installed in the longitudinal steel grooves. The air bag inflation and deflation structure is installed between the two longitudinal steel grooves. The tunnel center drainage ditch cover plate cast-in-situ bottom die structure can continuously perform construction operation on the cover plate of the tunnel center drainage ditch, avoids formwork and formwork dismantling at the bottom of the cover plate, reduces the labor intensity of workers, improves work efficiency, repeatedly uses the steel die bottom die and saves material cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel construction, and particularly relates to a tunnel center drainage ditch cover plate cast-in-place bottom mold structure. BACKGROUND

[0002] With the development of economic society, the highway industry is booming. However, because the mountainous area in China is vast, when building highways in mountainous areas, tunnel construction is required, and drainage is particularly important in the tunnel construction process, and the center drainage ditch is the most important. The existing tunnel center drainage ditch is first constructed with a drainage ditch, and then a cover plate is constructed on the top of the drainage ditch.

[0003] Generally, the conventional tunnel center drainage ditch cover plate is constructed by prefabrication and cast-in-place.

[0004] Construction method one: the tunnel inside or outside the site prefabricates the drainage ditch reinforced concrete cover plate, the cover plate and the plate seat concrete reach the strength, the plate seat sits the slurry to install the cover plate, and the plate joint is grouted and filled between the plates.

[0005] Construction method two: the cover plate bottom mold is erected in the center drainage ditch, the cover plate steel bar is installed, the cover plate concrete is poured, and after the cover plate concrete reaches the strength, the cover plate bottom mold in the drainage ditch is removed.

[0006] Construction method three: the bottom mold is laid in the drainage ditch, the bottom mold is not supported at the lower part, the cover plate is fixed with a lead wire hanging bottom mold above the horizontal steel pipe or cover plate main reinforcement, the cover plate steel bar is installed, the cover plate concrete is poured, and after the cover plate concrete reaches the strength, the hanging mold steel pipe and the cover plate bottom mold in the drainage ditch are removed.

[0007] Construction method four: on both sides of the plate seat in the drainage ditch, 32mm deep notches are symmetrically chiseled every 50cm, a 20mm diameter steel bar is laid on the steel bar, a 12mm thick cover plate bottom mold formwork is laid on the steel bar, after the gaps on both sides of the bottom mold are blocked, the cover plate steel bar is installed, the cover plate concrete is poured, and after the cover plate concrete reaches the strength, the formwork steel bar and the cover plate bottom mold in the drainage ditch are removed.

[0008] The above construction methods have many drawbacks: Methods 1, 2, and 3 require precast cover slabs to be precast outside the tunnel, or to be placed in the already narrow space inside the tunnel, affecting traffic flow; precast cover slabs are easily damaged during transportation and installation; installation requires grouting on the slab base, and if the installation is unstable, heavy vehicles transporting them inside the tunnel can damage or break the slabs; after installation, the gaps between the slabs need to be grouted. This method of precast cover slabs has multiple problems, and the precasting, transportation, hoisting, and installation operations are complex, labor-intensive, material-intensive, and time-consuming, while also failing to guarantee the secure and stable installation quality. Methods 2, 3, and 4 all require erecting formwork in the drainage ditch, and after the concrete reaches strength, removing the supporting frame and the bottom formwork of the cover slab inside the drainage ditch requires construction workers to climb into the narrow drainage ditch for formwork removal, which is time-consuming and labor-intensive. The fourth construction method is cast-in-place construction, but it still requires workers to dismantle the formwork in a confined space, which is extremely difficult. Cast-in-place cover slabs require a large amount of bottom formwork construction materials, resulting in high consumption and cost. Summary of the Invention

[0009] In view of this, the present invention provides a cast-in-place bottom formwork structure for a central drainage ditch cover plate in a tunnel, which improves construction quality, avoids the dismantling of the central formwork in the drainage ditch, and reduces the labor intensity of workers; by using the cast-in-place method, the steel formwork bottom formwork can be reused, saving costs.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A cast-in-place bottom formwork structure for a tunnel center drainage ditch cover includes: a traveling device, a bottom formwork device, and a bottom formwork lifting structure; the bottom formwork device includes a steel bottom formwork, an airbag bottom formwork, and an airbag inflation / deflation structure, a pair of bottom formwork lifting structures are fixedly installed on the traveling device, the steel bottom formwork is installed on the bottom formwork lifting structure, longitudinal steel grooves are provided on both sides of the steel bottom formwork, the airbag bottom formwork is embedded in the longitudinal steel grooves, and the airbag inflation / deflation structure is installed between the two longitudinal steel grooves.

[0012] Furthermore, the airbag inflation / deflation structure includes an air supply steel pipe and an air supply rubber hose. The air supply steel pipe is installed between the two longitudinal steel grooves and is connected to the bottom mold of the airbag. The multiple air supply steel pipes are connected to each other through the air supply rubber hose.

[0013] Furthermore, the traveling device includes a front section traveling part, a middle section traveling part, and a rear section traveling part, which are sequentially connected by pins.

[0014] Furthermore, the front end section traveling section, the middle section traveling section, and the rear end section traveling section each include a traveling crossbeam, a traveling longitudinal beam, and casters. A pair of traveling crossbeams are welded to the front and rear ends between two traveling longitudinal beams, and multiple casters are installed at the bottom ends of the traveling longitudinal beams.

[0015] Furthermore, the universal wheel in the front end section traveling part is a brake universal wheel.

[0016] Furthermore, the traveling device also includes a drive device, which includes a winch, a wire rope, and a tie rod. One end of the wire rope is fixed to the tie rod, and the other end of the wire rope is fixed to the winch. The winch is fixedly installed at the front end of the front section traveling part.

[0017] Furthermore, the bottom mold lifting structure includes a lifting wire rope, a lifting assembly, and a rotary roller. The top end of the lifting assembly is fixedly installed at the bottom end of the bottom mold, and the bottom end of the lifting assembly is fixedly installed on the traveling longitudinal beam. The rotary roller is rotatably installed on the rear end section traveling part. The lifting wire rope is fixedly installed on one side of the multiple lifting assemblies, and after passing around the rotary roller, it is fixedly installed on the other side of the multiple lifting assemblies.

[0018] Furthermore, the bottom formwork lifting structure also includes an ascending motor and a descending motor, both of which are mounted on the front end section traveling part. One end of the lifting wire rope is fixedly mounted on the output end of the ascending motor, and the other end of the lifting wire rope is fixedly mounted on the output end of the descending motor.

[0019] Furthermore, the lifting assembly includes lifting rods, an upper bolted base, a lower bolted base, and a wire rope locking part. The four lifting rods are sequentially hinged in a rhomboid shape to form an upper hinge part, a lower hinge part, a front hinge part, and a rear hinge part. The upper bolted base is hinged to the lifting rod at the upper hinge part, the lower bolted base is hinged to the lifting rod at the lower hinge part, and the wire rope locking part is hinged to the lifting rod at the front hinge part and the rear hinge part. The lifting wire rope passes through the wire rope locking part and is fixedly connected to the wire rope locking part.

[0020] Furthermore, the lifting assembly also includes an upward limiter and a downward limiter, which are fixedly installed on the lifting wire rope and are located on the front and rear sides of each wire rope locking part, respectively.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention utilizes a traveling section to carry the steel formwork bottom mold. With the assistance of a bottom mold lifting structure, it completes the traditional formwork erection and dismantling operations, avoiding the need for manual climbing into the drainage ditch for dismantling, thus saving time and labor. Using a cast-in-place method, the steel formwork bottom mold can be reused, saving costs. The cast-in-place cover plate has minimal impact on the tunnel construction site and traffic, and the cast-in-place concrete cover plate has strong integrity. The airbag bottom mold inflates on both sides of the steel formwork bottom mold, pressing and filling the gap between the steel formwork bottom mold and the drainage ditch, preventing water leakage and avoiding concrete from flowing into the drainage ditch, thus improving construction quality. For flexible assembly during on-site construction, it is divided into three standard sections of 2-3 meters: a front-end traveling section, a middle traveling section, and a rear-end traveling section. During on-site assembly, one front-end section and one rear-end section are each used, with the number of middle sections added according to construction needs. This flexible configuration facilitates construction. The braked universal wheels on the front-end traveling section improve the stability of the device during use. The bottom mold lifting structure avoids the use of traditional hydraulic press devices, reduces the use of hydraulic equipment, simplifies the device, and enables the bottom mold of the steel mold to rise and fall synchronously in the front section, middle section and rear section traveling parts. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a structural diagram illustrating the construction of a cast-in-place bottom formwork structure for a tunnel center drainage ditch cover plate during the drainage ditch construction.

[0025] Figure 2 This is a structural diagram of a cast-in-place bottom formwork structure for a central drainage ditch cover plate in a tunnel.

[0026] Figure 3 This is the northeast isometric view of the bottom mold assembly.

[0027] Figure 4 This is the southwest isometric view of the bottom mold assembly.

[0028] Figure 5 This is a schematic diagram of the traveling device.

[0029] Figure 6 This is a schematic diagram of the bottom formwork lifting structure on the traveling device.

[0030] Figure 7 This is a structural diagram of the lifting assembly.

[0031] Figure 8 This is a schematic diagram of the lifting component in its raised state.

[0032] Figure 9 This is a schematic diagram of the lowering state of the lifting component.

[0033] In the figure:

[0034] 100-Traveling device, 110-Front end section traveling part, 111-Traveling crossbeam, 112-Traveling longitudinal beam, 113-Wheel caster, 114-Brake wheel caster, 115-Pin, 120-Intermediate section traveling part, 130-Rear end section traveling part, 140-Drive device, 141-Winder, 142-Wire rope, 143-Tie rod, 210-Steel mold bottom mold, 211-Longitudinal steel channel, 220-Airbag bottom mold, 231-Air supply steel pipe, 232-Air supply rubber hose, 300- Bottom mold lifting structure, 310-lifting wire rope, 320-rotating roller, 330-lifting assembly, 331-lifting rod, 3311-upper hinge, 3312-lower hinge, 3313-front hinge, 3314-rear hinge, 332-bolted upper base, 333-bolted lower base, 334-wire rope locking part, 335-upper limiter, 336-lower limiter, 340-lifting motor, 350-lowering motor, 400-drainage ditch, 500-cover plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] See attached document Figures 1-9As shown, the present invention provides a cast-in-place bottom formwork structure for a tunnel center drainage ditch cover, comprising: a traveling device 100, a bottom formwork device 200, and a bottom formwork lifting structure 300; the bottom formwork device 200 includes a steel bottom formwork 210, an airbag bottom formwork 220, and an airbag inflation / deflation structure, a pair of bottom formwork lifting structures 300 are fixedly installed on the traveling device 100, the steel bottom formwork 210 is installed on the bottom formwork lifting structure 300, longitudinal steel grooves 211 are provided on both sides of the steel bottom formwork 210, the airbag bottom formwork 220 is embedded in the longitudinal steel grooves 211, and the airbag inflation / deflation structure is installed between the two longitudinal steel grooves 211. During construction, the traveling device 100 is positioned within the drainage ditch 400. The bottom formwork lifting structure 300 raises the steel bottom formwork 210 to a horizontal height flush with the drainage ditch wall 400. An external air compressor connected to the airbag inflation / deflation structure inflates the airbag bottom formwork 220, causing the airbag bottom formwork 220 on both sides of the steel bottom formwork 210 to press against the drainage ditch wall 400, ensuring no leakage between the airbag bottom formwork 220 and the drainage ditch wall 400. Concrete is poured at the top of the steel bottom formwork 210 and the drainage ditch wall 400, as well as in the middle of the tunnel structures on both sides, forming a cover plate 500 on-site. After the cover plate 500 has cured, the airbag bottom formwork 220 is deflated. The bottom formwork lifting structure 300 lowers the steel bottom formwork 210, and the traveling device 100, carrying the bottom formwork device 200 and the bottom formwork lifting structure 300, moves forward along the drainage ditch 400, sequentially pouring the cover plate 500 on-site. This invention avoids the need for manual erection and dismantling of formwork in narrow drainage ditches 400, enables the reuse of steel formwork bottom formwork 210, improves construction efficiency, and saves labor and material costs.

[0037] The airbag inflation / deflation structure includes an air supply steel pipe 231 and an air supply rubber hose 232. The air supply steel pipe 231 is installed between two longitudinal steel channels 211 and is connected to the airbag bottom mold 220. Multiple air supply steel pipes 231 are connected to each other through the air supply rubber hoses 232. An external air compressor is connected to the air supply steel pipes 231 to inflate and deflate the airbag bottom mold 220. Due to the long length of the drainage ditch 400, a long air supply steel pipe 231 is avoided. Multiple air supply steel pipes 231 are spliced ​​together using air supply rubber hoses 232, which facilitates disassembly and transportation and can adapt to drainage ditches 400 of different lengths.

[0038] The traveling device 100 includes a front traveling section 110, a middle traveling section 120, and a rear traveling section 130, which are connected sequentially by pins 115. For flexible assembly during on-site construction, it is available in three standard sections of 2-3 meters: the front traveling section 110, the middle traveling section 120, and the rear traveling section 130. During on-site assembly, one section each of the front and rear traveling sections is used, with the number of middle traveling sections added according to construction needs. To facilitate the installation of the airbag inflation / deflation structure onto the front section traveling section 110, the middle section traveling section 120, and the rear section traveling section 130, a section of air supply steel pipe 231 can be arranged on each of the front section traveling section 110, the middle section traveling section 120, and the rear section traveling section 130. In this way, when splicing the front section traveling section 110, the middle section traveling section 120, and the rear section traveling section 130, the air supply steel pipes 231 can be connected between the traveling sections using air supply rubber hoses 232.

[0039] The front section traveling section 110, the middle section traveling section 120, and the rear section traveling section 130 all include a traveling crossbeam 111, a traveling longitudinal beam 112, and casters 113. A pair of traveling crossbeams 111 are welded to the front and rear ends between two traveling longitudinal beams 112, and multiple casters 113 are installed at the bottom ends of the traveling longitudinal beams 112. After the construction of one stage of the cover plate 500 is completed, the traveling device 100 moves along the drainage ditch 400 to the next construction section with the help of the casters 113. Then, the device is braked by the braking casters 114 under the front section traveling section 110, which improves the stability of the device during construction.

[0040] The traveling device 100 also includes a drive device 140, which includes a winch 141, a wire rope 142, and a tie rod 143. One end of the wire rope 142 is fixed to the tie rod 143, and the other end is fixed to the winch 141. The winch 141 is fixedly installed at the front end of the front section traveling part 110. The tie rod 143 is fixed to the unconstructed drainage ditch 400 at the front end. The winch 141 is switched on and off. One end of the wire rope 142 is fixed to the tie rod 143 and remains stationary. The wire rope 142 is continuously wound onto the winch 141. During this process, because the winch 141 is fixedly installed on the front section traveling part 110, the front section traveling part 110, the middle section traveling part 120, and the rear section traveling part 130 are dragged forward.

[0041] The bottom mold lifting structure 300 includes a lifting wire rope 310, a lifting assembly 330, and a rotary roller 320. The top end of the lifting assembly 330 is fixedly installed on the bottom end of the bottom mold 210, and the bottom end of the lifting assembly 330 is fixedly installed on the traveling longitudinal beam 112. The rotary roller 320 is rotatably installed on the rear end section traveling part 130. The lifting wire rope 310 is fixedly installed on one side of the multiple lifting assemblies 330, passes around the rotary roller 320, and is fixedly installed on the other side of the multiple lifting assemblies 330. A pair of bottom mold lifting structures 300 are installed on the traveling longitudinal beam 112, and the lifting wire rope 310 is connected in series and fixedly installed on the multiple lifting assemblies 330 on the traveling longitudinal beam 112. Simultaneously pulling one end of the inner lifting wire rope 310 of the two lifting components 30, the lifting wire rope 310 passes around the rotary roller 320, and the outer lifting wire rope 310 of the two lifting components 30 moves in the opposite direction to the inner lifting wire rope 310. The lifting wire rope 310 pulls the lifting component 300 on both the inner and outer sides at the same time, which can realize the upward movement of the lifting component 330 and drive the bottom mold 210 of the steel mold to rise. At the same time, pulling one end of the outer lifting wire rope 310 of the two lifting components 30, the lifting wire rope 310 passes around the rotary roller 320, and the inner lifting wire rope 310 of the two lifting components 30 moves in the opposite direction to the inner lifting wire rope 310. The lifting wire rope 310 pulls the lifting component 300 on both the inner and outer sides at the same time, which can realize the downward movement of the lifting component 330 and drive the bottom mold 210 of the steel mold to fall.

[0042] The bottom mold lifting structure 300 also includes a lifting motor 340 and a lowering motor 350. Both the lifting motor 340 and the lowering motor 350 are mounted on the front section traveling part 110. One end of the lifting wire rope 310 is fixedly mounted on the output end of the lifting motor 340, and the other end of the lifting wire rope 310 is fixedly mounted on the output end of the lowering motor 350. The lifting motor 340 pulls the lifting wire rope 310 on the inner side of the two lifting components 300, which realizes the lifting component 330's upward movement, driving the bottom mold 210 of the steel mold to rise. The lowering motor 350 pulls the lifting wire rope 310 on the outer side of the two lifting components 300, which realizes the lifting component 330's downward movement, driving the bottom mold 210 of the steel mold to fall.

[0043] The lifting assembly 330 includes lifting rods 331, a bolted upper base 332, a bolted lower base 333, and a wire rope locking part 334. The four lifting rods 331 are sequentially hinged in a rhomboid shape to form an upper hinge part 3311, a lower hinge part 3312, a front hinge part 3313, and a rear hinge part 3314. The bolted upper base 332 is hinged to the lifting rods 331 at the upper hinge part 3311, and the bolted lower base 333 is hinged to the lifting rods 331 at the lower hinge part 3312. The wire rope locking part 334 is hinged to the lifting rods 331 at the front hinge part 3313 and the rear hinge part 3314. The lifting wire rope 310 passes through the wire rope locking part 334 and is fixedly connected to the wire rope locking part 334. When the lifting motor 340 pulls the lifting wire rope 310, the lifting wire rope 310 pulls the wire rope locking part 334 to move horizontally. Since the wire rope locking part 334 is hinged to the front hinge part 3313 and the rear hinge part 3314 to the lifting rod 331, and the four lifting rods 331 are sequentially hinged to each other in a diamond shape. The lifting motor 340 pulls the lifting wire rope 310 on the inner side of the lifting assembly 300. The lifting wire rope 310 pulls the wire rope locking parts 334 on both sides of the lifting assembly 300 to move in opposite directions, which makes the four rhomboidly hinged lifting rods 331 "tall and thin". The upper hinge part 3311 is bolted to the upper base 332, which drives the bottom mold 210 of the steel mold to rise. The lowering motor 350 pulls the lifting wire rope 310 on the outer side of the lifting assembly 300. The lifting wire rope 310 pulls the wire rope locking parts 334 on both sides of the lifting assembly 300 to move in opposite directions, which makes the four rhomboidly hinged lifting rods 331 "short and fat". The upper hinge part 3311 is bolted to the upper base 332, which drives the bottom mold 210 of the steel mold to fall.

[0044] The lifting assembly 330 also includes an upward limiter 335 and a downward limiter 336, which are fixedly installed on the lifting wire rope 310. The upward limiter 335 and the downward limiter 336 are located on the front and rear sides of each wire rope locking part 334, respectively. The upward limiter 335 and the downward limiter 336 can limit the travel of the wire rope locking part 334 and the lifting wire rope 310, improving the stability of the lifting assembly 300 during operation and preventing the bottom mold 210 of the steel mold from being too high or too low.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cast-in-place bottom formwork structure for a tunnel center drainage ditch cover, characterized in that, include: Traveling device, bottom formwork device, and bottom formwork lifting structure; The bottom mold device includes a steel bottom mold, an airbag bottom mold, and an airbag inflation / deflation structure. A pair of bottom mold lifting structures are fixedly installed on the traveling device. The steel bottom mold is installed on the bottom mold lifting structure. Longitudinal steel grooves are provided on both sides of the steel bottom mold. The airbag bottom mold is embedded in the longitudinal steel grooves. The airbag inflation / deflation structure is installed between the two longitudinal steel grooves. The airbag inflation / deflation structure includes an air supply steel pipe and an air supply rubber hose. The air supply steel pipe is installed between the two longitudinal steel grooves and is connected to the bottom mold of the airbag. The multiple air supply steel pipes are connected to each other through the air supply rubber hose. The traveling device includes a front section traveling part, a middle section traveling part, and a rear section traveling part, which are connected in sequence by pins. The front section traveling section, the middle section traveling section, and the rear section traveling section each include a traveling crossbeam, a traveling longitudinal beam, and casters. A pair of traveling crossbeams are welded to the front and rear ends between two traveling longitudinal beams, and multiple casters are installed at the bottom ends of the traveling longitudinal beams. The bottom mold lifting structure includes a lifting wire rope, a lifting assembly, and a rotary roller. The top end of the lifting assembly is fixedly installed at the bottom end of the bottom mold, and the bottom end of the lifting assembly is fixedly installed on the traveling longitudinal beam. The rotary roller is rotatably installed on the rear end section traveling part. The lifting wire rope is fixedly installed on one side of the multiple lifting assemblies, passes around the rotary roller, and is fixedly installed on the other side of the multiple lifting assemblies. The bottom formwork lifting structure also includes a lifting motor and a lowering motor. Both the lifting motor and the lowering motor are installed on the front end section traveling part. One end of the lifting wire rope is fixedly installed on the output end of the lifting motor, and the other end of the lifting wire rope is fixedly installed on the output end of the lowering motor. The lifting assembly includes lifting rods, a bolted upper base, a bolted lower base, and a wire rope locking part. The four lifting rods are sequentially hinged in a rhomboid shape to form an upper hinge part, a lower hinge part, a front hinge part, and a rear hinge part. The bolted upper base is hinged to the lifting rod at the upper hinge part, and the bolted lower base is hinged to the lifting rod at the lower hinge part. The wire rope locking part is hinged to the lifting rod at the front hinge part and the rear hinge part. The lifting wire rope passes through the wire rope locking part and is fixedly connected to the wire rope locking part. The lifting assembly also includes an upward limiter and a downward limiter, which are fixedly installed on the lifting wire rope. The upward limiter and the downward limiter are located on the front and rear sides of each wire rope locking part, respectively.

2. The cast-in-place bottom formwork structure for a tunnel center drainage ditch cover plate according to claim 1, characterized in that, The casters in the front section traveling section are brake casters.

3. The cast-in-place bottom formwork structure for a tunnel center drainage ditch cover plate according to claim 1, characterized in that, The traveling device also includes a drive device, which includes a winch, a wire rope, and a tie rod. One end of the wire rope is fixed to the tie rod, and the other end of the wire rope is fixed to the winch. The winch is fixedly installed at the front end of the front section traveling part.

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