Portable bridge fabrication machine

Abstract

The light bridge fabrication machine comprises a main truss and a walking mechanism, the walking mechanism comprises a lifting oil cylinder, walking wheels, a track beam and a front support, a first cylinder body of the lifting oil cylinder is fixedly connected with the main truss, the walking wheels are connected with a first piston rod of the lifting oil cylinder, the track beam is arranged below the walking wheels, and the front support is fixedly arranged at the bottom of the main truss. According to the walking mechanism, a track does not need to be laid on a bridge floor in advance, the walking action of the main truss is achieved through cooperation of the liftable walking wheels and the track beams, the gravity center of the main truss can be low in the walking and concrete pouring process, and the overturning risk of the portable bridge fabrication machine can be reduced. Meanwhile, a reverse buckling wheel overturn-preventing mechanism, a mold opening and closing mechanism and a folding door curtain are further arranged, and the beneficial effects of being stable in operation, low in manufacturing cost, convenient to install and construct, high in reliability and the like are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction engineering equipment, and in particular to a portable bridge-building machine. Background Art

[0002] Bridge construction machine, also known as bridge building machine, is a kind of mechanical equipment specially used for bridge construction. It can complete multiple links in the overall construction of the bridge, such as pouring of the bridge. The use of bridge construction machine can greatly improve the efficiency and quality of bridge construction and reduce the input of manpower and material resources.

[0003] The main truss is an important supporting structure of the bridge-building machine. A template is hung in front of the main truss. The template includes an inner mold and an outer mold. After the inner mold and the outer mold are combined, a casting space for the box girder is formed. After a section of box girder is cast through the template, it is necessary to open the mold, and the main truss moves forward with the template. After it moves into place, the mold is closed to cast the next section of the box girder. This reciprocating process completes the casting of the entire box girder.

[0004] The existing main truss travel mechanism includes a track laid on the bridge deck (top surface of the box girder), a slider is provided on the track, the bottom of the main truss is fixed on the slider, and the main truss travels by relying on the cooperation of the slider and the track. The disadvantage is that the travel mechanism with tracks and sliders will raise the center of gravity of the main truss, and an excessively high center of gravity will increase the risk of the bridge-building machine tipping forward. Summary of the invention

[0005] The object of the present invention is to provide a portable bridge-building machine.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0007] A portable bridge-building machine comprises a main truss and a traveling mechanism, wherein the traveling mechanism comprises a lifting cylinder, traveling wheels, a track beam and a front support, wherein the first cylinder body of the lifting cylinder is fixedly connected to the main truss, the traveling wheels are connected to the first piston rod of the lifting cylinder, the track beam is arranged below the traveling wheels, and the front support is fixedly arranged at the bottom of the main truss.

[0008] As a further improved technical solution of the present invention, the main truss includes a telescopic beam, which includes a bottom chord beam, an outer beam, and an inner beam which are sequentially sleeved from the outside to the inside, and also includes a telescopic oil cylinder located on the inner side of the inner beam, the front end of the second piston rod of the telescopic oil cylinder is connected and fixed to the bottom chord beam, the front end of the second cylinder body of the telescopic oil cylinder is connected and fixed to the outer beam, the rear end of the second cylinder body is provided with a pulley, a transmission rope is wound around the pulley, and the two ends of the transmission rope are respectively fixedly connected to the front end of the bottom chord beam and the front end of the inner beam;

[0009] The second piston rod is provided with a joint portion for connecting the oil pipe near the front end, and the joint portion is communicated with the interior of the second cylinder body through a first oil hole and a second oil hole opened in the second piston rod.

[0010] As a further improved technical solution of the present invention, it also includes a reverse wheel anti-overturning mechanism, the reverse wheel anti-overturning mechanism includes a rear beam body, and the rear beam body includes a rear cross beam, a rear bow beam, and a rear mounting beam;

[0011] The rear cross beam is arranged across the built box beam and pressed on the rear part of the main truss, the rear bow beam is located on both sides of the rear cross beam, the upper end of the rear bow beam is fixedly connected to the rear cross beam, the lower end of the rear bow beam extends to the bottom of the flange of the built box beam, the rear mounting beam is connected to the rear bow beam, and the rear mounting beam is provided with a buckle wheel for cooperating with the bottom surface of the flange of the built box beam;

[0012] It also includes a first connecting member so that the rear beam can move synchronously with the main truss.

[0013] As a further improved technical solution of the present invention, the anti-overturning mechanism of the reverse wheel also includes a rear pressure beam, which is press-fitted and arranged at the rear of the main truss, and the rear pressure beam is anchored and connected to the built box beam through precision-rolled threaded steel bars.

[0014] As a further improved technical solution of the present invention, it also includes a mold opening and closing mechanism;

[0015] The mold opening and closing mechanism includes a sliding beam for carrying the outer mold, and also includes a front beam body and a middle beam body. The front beam body is arranged on both sides of the front cross beam, and the middle beam body is arranged on both sides of the door curtain.

[0016] The front beam body comprises a front bow beam and a front mounting beam, the top of the front bow beam is fixedly connected to the front cross beam, the bottom of the front bow beam is connected to the front mounting beam, and the front mounting beam is horizontally arranged;

[0017] The middle beam body includes a middle arch beam and a middle mounting beam, the top of the middle arch beam is fixedly connected to the door curtain, the bottom of the middle arch beam is connected to the middle mounting beam, and the middle mounting beam is horizontally arranged;

[0018] The front mounting beam is provided with a front vertical drive assembly, which is rigidly connected to the front end of the sliding beam to drive the front end of the sliding beam to move in the vertical direction. The front mounting beam is also provided with a front horizontal drive assembly to drive the front vertical drive assembly to move with the front end of the sliding beam in the horizontal direction.

[0019] A middle vertical drive assembly is provided on the middle mounting beam, and the middle vertical drive assembly is rigidly connected to the rear end of the sliding beam to drive the rear end of the sliding beam to move in the vertical direction. A middle horizontal drive assembly is also provided on the middle mounting beam to drive the middle vertical drive assembly to move with the rear end of the sliding beam in the horizontal direction.

[0020] As a further improved technical solution of the present invention, the front vertical drive assembly includes a front slide plate, a front vertical worm seat, and a front vertical worm, the front slide plate is slidably matched with the front mounting beam, the front vertical worm seat is arranged on the front slide plate, and the top of the front vertical worm is connected to the front end of the sliding beam;

[0021] The front horizontal driving assembly includes a front horizontal worm seat, a front horizontal worm, and a front supporting block. The front supporting block is fixedly connected to the front mounting beam. The front horizontal worm seat and the front horizontal worm are arranged between the front supporting block and the front slide plate.

[0022] As a further improved technical solution of the present invention, the middle vertical drive assembly includes a middle slide plate, a middle vertical worm seat, and a middle vertical worm, the middle slide plate is slidably matched with the middle mounting beam, the middle vertical worm seat is arranged on the middle slide plate, and the top of the middle vertical worm is connected to the rear end of the sliding beam;

[0023] The middle horizontal driving assembly includes a middle horizontal worm seat, a middle horizontal worm, and a middle supporting block. The middle supporting block is fixedly connected to the middle mounting beam. The middle horizontal worm seat and the middle horizontal worm are arranged between the middle supporting block and the middle slide plate.

[0024] As a further improved technical solution of the present invention, it also includes a folding door curtain, the folding door curtain includes two groups of door curtain bodies arranged in mirror symmetry, and a connecting mechanism arranged between the two groups of door curtain bodies, the connecting mechanism can adjust the distance between the two groups of door curtain bodies, so that the width of the folding door curtain is adjustable;

[0025] Each group of the door curtain bodies includes two lower beams arranged in parallel and at intervals, and an upper beam located between the two lower beams, and a plurality of first connecting rods are arranged between the upper beam and the lower beams, and the first connecting rods are hingedly connected to the lower beam and the upper beam, so that the upper beam can be folded and stored between the two lower beams.

[0026] As a further improved technical solution of the present invention, the upper cross beams of the two groups of door curtain bodies are both provided with a fixing plate, and the connecting mechanism includes a first screw rod and a connecting plate;

[0027] The first screw rod passes through the through hole on the fixing plate and is connected to the fixing plate through a nut, so that the distance between the upper sides of the two sets of door curtain bodies can be adjusted through the fixed position of the first screw rod and the fixing plate;

[0028] The connecting plate is provided with a plurality of connecting holes at intervals, and the connecting plate is connected to the lower cross beam via bolts matched with the connecting holes, so that the distance between the lower sides of the two groups of door curtain bodies can be adjusted by selecting the connecting holes.

[0029] As a further improved technical solution of the present invention, the door curtain body also includes a connecting head for fixing the upper cross beam on the main truss uprights, the connecting head includes a large end for limiting and a small end for connecting with the upper cross beam, a plurality of first pin holes are provided on the small end at intervals, and a plurality of second pin holes are provided on the upper cross beam.

[0030] Compared with the prior art, the technical effects of the present invention are:

[0031] The traveling mechanism of the present invention does not require pre-laying of tracks on the bridge deck, and the traveling movement of the main truss is achieved by the cooperation of the liftable traveling wheels and the track beams, so that the main truss has a lower center of gravity during the walking and concrete pouring processes, which is beneficial to reducing the risk of overturning of the lightweight bridge-building machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the three-dimensional structure of the main truss in an embodiment of the present invention;

[0033] Figure 2 is a schematic cross-sectional structural diagram of a main truss in an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 A schematic diagram of the local enlarged structure at F in the middle;

[0035] Figure 4 is a schematic diagram of the three-dimensional structure of the telescopic beam in an embodiment of the present invention;

[0036] Figure 5 is a schematic cross-sectional structural diagram of a telescopic beam in an embodiment of the present invention;

[0037] Figure 6 yes Figure 5 A schematic diagram of the local enlarged structure at E in the middle;

[0038] Figure 7 Schematic diagram of the exploded structure of the telescopic beam in the embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of the three-dimensional structure of a portable bridge-building machine used to demonstrate the anti-overturning mechanism of the reverse buckle wheel in an embodiment of the present invention;

[0040] Fig. 9 yes Figure 8 A schematic diagram of the local enlarged structure at point A in the middle;

[0041] Fig.10is a schematic diagram of the three-dimensional structure of the rear beam body in an embodiment of the present invention;

[0042] Fig.11 It is a schematic diagram of the three-dimensional structure of a portable bridge-building machine used to display the mold opening and closing mechanism in an embodiment of the present invention;

[0043] Fig.12 yes Fig.11 A schematic diagram of the local enlarged structure at C in the middle;

[0044] Fig.13 2 is a schematic diagram of the structure of a portable bridge-building machine from the right side according to an embodiment of the present invention;

[0045] Fig.14 yes Fig.13 A schematic diagram of the local enlarged structure at D in the middle;

[0046] Fig.15 is a schematic diagram of the three-dimensional structure of the folding door curtain in an embodiment of the present invention;

[0047] Fig.16 It is a schematic diagram of the three-dimensional structure of a portable bridge-building machine for displaying a folding door curtain in an embodiment of the present invention;

[0048] Fig.17 yes Fig.16 Schematic diagram of the local enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0049] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0050] The following are explanations of some of the names that appear in this article:

[0051] A box girder is an existing bridge structure. A built box girder refers to a box girder that has been cast and the concrete has solidified, and can be regarded as a stable installation platform.

[0052] The flange refers to the edges that extend out on both sides of the top of the box girder.

[0053] The main truss is an important supporting structure of the bridge-building machine, which usually includes two sets of main trusses in a diamond-shaped frame.

[0054] The front crossbeam is a transverse beam fixed to the front end of the main truss.

[0055] The door curtain is a connecting structure fixed in the middle of the main truss, and is used to connect two sets of main trusses into one.

[0056] See also Figures 1 to 3A portable bridge-building machine includes a main truss 200 and a traveling mechanism, wherein the traveling mechanism includes a lifting cylinder 71, a traveling wheel 72, a track beam 73, and a front support 79. The first cylinder body 711 of the lifting cylinder 71 is fixedly connected to the main truss 200, the traveling wheel 72 is connected to the first piston rod 712 of the lifting cylinder 71, the track beam 73 is arranged below the traveling wheel 72, and the front support 79 is fixedly arranged at the bottom of the main truss 200.

[0057] Specifically, the first cylinder body 711 is fixedly connected to the bottom chord beam 201 of the main truss 200, the front support 79 is fixed to the bottom of the bottom chord beam 201, the running wheel 72 includes a wheel body and a wheel seat, the wheel body is mounted on the wheel seat through a rotating shaft, and the wheel seat of the running wheel 72 is connected to the first piston rod 712. When the running wheel 72 is not pressed on the track beam 73, the track beam 73 can move in the front-rear direction under human push and pull.

[0058] When the main truss 200 is fixed in position, the front support 79 is directly pressed on the bridge deck, and the first piston rod 712 raises the traveling wheel 72. At this time, the track beam 73 is not under force; when the main truss 200 needs to move forward, the track beam 73 is first pulled forward. After the track beam 73 is adjusted forward into position, the first piston rod 712 presses down with the traveling wheel 72 until the main truss 200 is lifted up, and the front support 79 slightly leaves the bridge deck. At this time, the traveling wheel 72 can roll on the track beam 73, allowing the main truss 200 to move forward.

[0059] The traveling mechanism of the present invention does not need to pre-lay tracks on the bridge deck. The traveling movement of the main truss 200 is achieved by cooperating with the liftable traveling wheels 72 and the track beams 73. This allows the main truss 200 to have a lower center of gravity during traveling and pouring concrete, which is beneficial to reducing the risk of overturning of the lightweight bridge-building machine.

[0060] In the prior art, the bottom of the main truss is usually set as a telescopic beam, and a cylinder is arranged in the telescopic beam. When the main truss needs to be adjusted forward, the telescopic beam is extended by the cylinder to make the main truss move forward.

[0061] The existing main truss telescopic beam is usually a two-section telescopic beam consisting of the bottom chord beam of the main truss and the inner beam arranged in the bottom chord beam. During the movement of the main truss, the length of the inner beam extension is the stroke of the main truss, which means that the inner beam needs to be extended to a longer length to ensure the single travel of the main truss. A template is suspended at the front end of the main truss, which will transmit a downward force to the front end of the bottom chord beam, causing the bottom chord beam to have a tendency to press down at the front end and tilt up at the rear end, which in turn causes contact friction between the inner wall of the bottom chord beam and the outer wall of the inner beam. Especially when the inner beam is extended beyond its own center point, the friction between the inner beam and the bottom chord beam increases geometrically, and the movement resistance of the main truss becomes very large.

[0062] The oil cylinder in the existing telescopic beam is provided with a joint for connecting the oil pipe near both ends of the cylinder body (the joint is arranged along the radial direction of the cylinder body and protrudes from the cylinder body), and the joint is connected to the inside of the cylinder body through the oil hole on the cylinder body (coaxially arranged with the joint). The traditional oil cylinder with joints at both ends of the cylinder body takes up a lot of space and cannot be well adapted to the installation and use in the narrow space of the telescopic beam.

[0063] See also Figures 4 to 7 In the present embodiment, the main truss 200 includes a telescopic beam, which includes a bottom chord beam 201, an outer beam 202, and an inner beam 203 which are sequentially sleeved from the outside to the inside, and also includes a telescopic cylinder 6 located on the inner side of the inner beam 203, the front end of the second piston rod 61 of the telescopic cylinder 6 is connected and fixed to the bottom chord beam 201, the front end of the second cylinder body 62 of the telescopic cylinder 6 is connected and fixed to the outer beam 202, and the rear end of the second cylinder body 62 is provided with a pulley 7, a transmission rope 8 is wound around the pulley 7, and the two ends of the transmission rope 8 are respectively fixedly connected to the front end of the bottom chord beam 201 and the front end of the inner beam 203.

[0064] It should be noted that the outer beam 202 is a name relative to the inner beam 203 . In fact, the outer beam 202 is located between the bottom chord beam 201 and the inner beam 203 .

[0065] The front end of the second piston rod 61 is fixed to the bottom chord beam 201 by a positioning pin (not shown), and the front end of the second cylinder body 62 is fixed to the front end of the outer beam 202, so when the telescopic cylinder 6 is in operation, the second cylinder body 62 will drive the outer beam 202 to extend or shorten.

[0066] When the second cylinder 62 moves backward, it applies force to the transmission cable 8 through the pulley 7, and then the transmission cable 8 pulls the inner beam 203 to extend.

[0067] After the main truss 200 has finished moving, the inner beam 203 can be pushed back manually, or a set of pulleys and transmission cables can be set up again, so that the inner beam 203 can automatically retract under the drive of the telescopic oil cylinder 6. Specifically, the working principle of the pulley and transmission cable used to drive the inner beam 203 to automatically retract is similar to the pulley 7 and transmission cable 8 used to drive the inner beam 203 to extend. The difference is that the pulley used to drive the inner beam 203 to automatically retract needs to be set at the front end of the second cylinder body 62, and the two ends of the transmission cable are respectively fixedly connected to the rear end of the bottom chord beam 201 and the rear end of the inner beam 203. The present invention does not limit the retraction method of the inner beam 203.

[0068] A joint portion 611 for connecting an oil pipe is provided near the front end of the second piston rod 61 . The joint portion 611 is connected to the interior of the second cylinder body 62 through a first oil hole 63 and a second oil hole 64 provided in the second piston rod 61 .

[0069] Specifically, the first oil hole 63 and the second oil hole 64 are respectively communicated with the spaces on both sides of the piston inside the second cylinder body 62 .

[0070] When the first oil hole 63 supplies oil to the second cylinder body 62, the second oil hole 64 returns oil, and the second cylinder body 62 extends; when the second oil hole 64 supplies oil to the second cylinder body 62, the first oil hole 63 returns oil, and the second cylinder body 62 shortens.

[0071] It should be noted that the joint part 611 is block-shaped, and a number of oil circuits are provided in the joint part 611 as needed. In practical applications, not only the two-way joints of the telescopic cylinder 6 for driving the telescopic beam to operate can be integrated on the joint part 611, but also the joints of other cylinders of the main truss (such as the lifting cylinder 71) can be integrated on the joint part 611.

[0072] In this embodiment, a solenoid valve is provided on the joint part 611 (not shown, the solenoid valve is fixed on the top surface of the joint part 611 and is connected to the oil circuit of the joint part 611). The solenoid valve is used to control the conduction or cutoff of the oil circuit. The joint part 611 is connected to the oil pipe through the solenoid valve.

[0073] In other implementations, the oil pipe may be directly connected to the joint portion 611 , and the solenoid valve or other valve bodies may be disposed outside the telescopic beam.

[0074] In this embodiment, the outer beam 202 is provided with a first roller 2021 that cooperates with the inner wall of the bottom chord beam 201. The first roller 2021 is used to reduce the friction between the outer beam 202 and the bottom chord beam 201.

[0075] In this embodiment, the inner beam 203 is provided with a second roller 2031 that cooperates with the inner wall of the outer beam 202. The second roller 2031 is used to reduce the friction between the inner beam 203 and the outer beam 202.

[0076] A three-section structure consisting of a bottom chord beam 201, an outer beam 202, and an inner beam 203 is adopted to distribute the travel of the main truss to the outer beam 202 and the inner beam 203. The outer beam 202 does not need to extend too long from the bottom chord beam 201, and the inner beam 203 does not need to extend too long from the outer beam 202 to meet the single travel travel of the main truss 200, which is beneficial to suppressing the friction between the telescopic beam bodies, so that the main truss 200 can travel smoothly. At the same time, the joints of the two oil circuits required by the telescopic cylinder 6 are integrated and arranged at the front end of the second piston rod 61, and the joint part 611 and the inside of the second cylinder body 62 are connected through the first oil hole 63 and the second oil hole 64 arranged in the second piston rod 61, which has the characteristic of occupying a small installation space and is particularly suitable for installation and use in a narrow space in a telescopic beam.

[0077] In the prior art, since the center of gravity of the bridge-building machine is naturally forward (on the template side), an anti-overturning mechanism is provided near the rear side of the bridge-building machine to prevent the bridge-building machine from overturning forward.

[0078] The existing anti-overturning mechanism of the main truss of the bridge-building machine during its travel usually includes a reverse wheel and a track. The track is connected and fixed to the top of the built box beam through a connector and a vertical pier (the vertical pier is a vertically arranged steel bar that needs to be pre-embedded and anchored on the box beam), and the main truss of the bridge-building machine cooperates with the track through the reverse wheel.

[0079] The shortcomings of the existing anti-overturning mechanism are high cost, difficulty in installation and construction, and poor reliability. Specifically, the complex structure and the need to repeatedly disassemble and assemble a large number of embedded parts (mainly vertical piers) lead to high cost and difficulty in installation and construction; if the anchor points are not evenly distributed or the welding is not firm, it may cause local stress concentration, causing deformation or fracture of the track connection structure, and poor reliability.

[0080] See also Figures 8 to 10 In this embodiment, the portable bridge-building machine further includes a reverse-knock wheel anti-overturning mechanism, and the reverse-knock wheel anti-overturning mechanism includes a rear beam body 100, and the rear beam body 100 includes a rear cross beam 101, a rear bow beam 102, and a rear mounting beam 103;

[0081] The rear cross beam 101 is arranged across the built box beam 400 and pressed on the rear part of the main truss 200 of the portable bridge-building machine. The rear bow beam 102 is located on both sides of the rear cross beam 101. The upper end of the rear bow beam 102 is fixedly connected to the rear cross beam 101. The lower end of the rear bow beam 102 extends to the bottom of the flange 401 of the built box beam 400. The rear installation beam 103 is connected to the rear bow beam 102. The rear installation beam 103 is provided with a buckle wheel 104 for cooperating with the bottom surface of the flange 401 of the built box beam 400.

[0082] A first connecting member is also included to enable the rear beam body 100 to move synchronously with the main truss 200 .

[0083] A template 300 is suspended in front of the main truss 200. After a section of the box girder 400 is cast through the template 300, the main truss 200 needs to be adjusted to move forward with the template 300 to cast the next section of the box girder 400, and the casting of the entire box girder 400 is completed in this way. The first connecting member is used to connect the rear beam body 100 and the main truss 200 to ensure that the rear beam body 100 moves synchronously during the movement of the main truss 200, and is always pressed on the rear part of the main truss 200, so as to prevent the main truss 200 from tipping forward.

[0084] In this embodiment, a door curtain body 500 is connected to the middle of the main truss 200, and both sides of the door curtain body 500 are connected to a middle beam body, and the middle beam body includes a middle bow beam 601 and a middle mounting beam 602, and the middle mounting beam 602 is connected to a sliding beam 1;

[0085] The first connecting member is two groups of second connecting rods 111 (each group of second connecting rods 111 consists of two, one on each side), one group of second connecting rods 111 connects the rear bow beam 102 and the middle bow beam 601, and the other group of second connecting rods 111 connects the rear mounting beam 103 and the sliding beam 1.

[0086] During the movement of the main truss 200, the positions of the door curtain body 500, the middle beam body, and the sliding beam 1 are fixed relative to the main truss 200. After the rear bow beam 102, the middle bow beam 601, the rear installation beam 103, and the sliding beam 1 are connected by the second connecting rod 111, the rear beam body 100 and the main truss 200 are indirectly connected as an integrated structure to overcome the friction between the anti-knock wheel 104 and the bottom surface of the flange 401, so that the rear beam body 100 and the main truss 200 can move synchronously. Since the connection position of the second connecting rod 111 on the rear beam body 100 (the rear bow beam 102 and the rear installation beam 103) is close to the anti-knock wheel 104 (the component that generates friction during the movement), the synchronization of the movement of the rear beam body 100 and the main truss 200 can be more reliably guaranteed, which is a preferred embodiment of the first connecting member.

[0087] Of course, in other embodiments, it is not excluded that bolts may be used as the first connecting member to directly connect and fix the rear beam body 100 and the main truss 200 at the pressing point between the rear cross beam 101 and the main truss 200, so that the rear beam body 100 can move synchronously with the main truss 200.

[0088] In this embodiment, a plurality of third pin holes 115 are provided at intervals in the vertical direction on the rear bow beam 102, and the rear mounting beam 103 is connected to the rear bow beam 102 via a first positioning pin 116 penetrating the third pin holes 115, so that the distance between the anti-knock wheel 104 and the bottom surface of the flange 401 of the built box beam 400 is adjustable. During the installation process, the position of the anti-knock wheel 104 should be adjusted according to the specifications of the actual box beam 400, so that the anti-knock wheel 104 is set close to or close to the bottom surface of the flange 401.

[0089] Furthermore, the buckle wheel 104 includes a first wheel seat 1041 and a plurality of first wheel bodies 1042, the first wheel seat 1041 is fixedly connected to the rear mounting beam 103, and the plurality of first wheel bodies 1042 are connected to the first wheel seat 1041 via a rotating shaft.

[0090] Furthermore, the rear cross beam 101 is anchored and connected to the existing box beam 400 through the precision-rolled threaded steel bar 2 .

[0091] Furthermore, the anti-overturning mechanism of the reverse wheel also includes a rear pressure beam 112, which is press-fitted and arranged at the rear part of the main truss 200, and the rear pressure beam 112 is anchored and connected to the built box beam 400 through the precision-rolled threaded steel bar 2.

[0092] It should be noted that the fine-rolled threaded steel bar 2 is fixedly connected to the built box girder 400, and the rear cross beam 101 and the rear compression beam 112 are connected to the fine-rolled threaded steel bar 2 through the first nut 113 and the gasket 114. After the main truss 200 is moved, before the concrete is poured in the template 300, the rear cross beam 101 is anchored and connected to the built box girder 400 through the fine-rolled threaded steel bar 2, and the rear compression beam 112 is anchored and connected to the built box girder 400 through the fine-rolled threaded steel bar 2, all in order to strengthen the load-bearing capacity of the anti-overturning mechanism. After the pouring is completed, when the concrete in the template 300 is solidified, the anchoring connection between the rear cross beam 101 and the rear compression beam 112 and the built box girder 400 can be disconnected by loosening the first nut 113 connected to the fine-rolled threaded steel bar 2 or cutting off the fine-rolled threaded steel bar 2. At this time, the main truss 200 can move forward, and the anti-overturning is achieved only by the buckle wheel 104 buckled on the bottom surface of the flange 401.

[0093] If the reverse wheel 104 is only close to, but not close to the bottom surface of the flange 401 (there is a small gap) when installing the rear beam 100, after disconnecting the anchor connection between the rear cross beam 101, the rear pressure beam 112 and the built box beam 400, the portable bridge machine will tilt forward slightly, and the reverse wheel 104 will rise and be close to the reverse surface of the flange 401 to achieve the anti-overturning effect.

[0094] The anti-overturning mechanism 200 is prevented from rolling over during the movement of the main truss 200 by cooperating with the anti-hook wheel 104 and the bottom surface of the flange 401 of the built box girder 400. There is no need to set up a track that cooperates with the anti-hook wheel 104. The structure is simple and eliminates the process of repeatedly disassembling and assembling a large number of embedded parts for installing the track. The structure has the advantages of low cost and convenient installation and construction. The anti-hook wheel 104 directly cooperates with the bottom surface of the flange 401 of the built box girder 400. There is no problem of deformation or breakage of the existing track connection structure, and the reliability of anti-overturning is high.

[0095] In the prior art, the sliding beam is a beam body used to support the outer mold. When pouring concrete, the front end of the sliding beam is anchored to the front crossbeam through fine-rolled threaded steel bars, and the rear end of the sliding beam is anchored to the built box beam through fine-rolled threaded steel bars. When it is necessary to open the mold and adjust the template to move forward, the fine-rolled threaded steel bars connected to the sliding beam will be disconnected, and the front end of the sliding beam will be connected to the front crossbeam through the steel cable of the manual hoist, and the rear end of the sliding beam will be connected to the door curtain through the steel cable of the manual hoist. When opening the mold, the worker lowers the sliding beam through the manual hoist so that the top of the outer mold leaves the bottom of the flange of the box beam. When the mold is in place and needs to be closed, the manual hoist is also used to lift the sliding beam so that the top of the outer mold is flush with the bottom of the flange of the built box beam, and then the sliding beam is anchored again with fine-rolled threaded steel bars.

[0096] The disadvantage of the prior art of adjusting the height of the slide beam by the steel cable of the manual hoist to complete the opening and closing of the outer mold is that the outer mold cannot move horizontally when opening the mold, and the straight plate of the outer mold in the vertical direction will still rub against the outer side of the box beam, and the resistance is large when the template moves forward and the outer side of the box beam is easy to scratch. At the same time, because the steel cable is made of soft material, the outer mold is easy to shake when the template moves forward, which poses a safety hazard.

[0097] See also Figures 11 to 14 , in this embodiment, the portable bridge-building machine further includes a mold opening and closing mechanism;

[0098] The mold opening and closing mechanism includes a sliding beam 1 for supporting an outer mold 301, and also includes a front beam body 700 and a middle beam body 600. The front beam body 700 is arranged on both sides of the front cross beam 3, and the middle beam body 600 is arranged on both sides of the door curtain body 500 (in other embodiments, it is not excluded that the folding door curtain formed by the door curtain body 500 can be replaced by a door curtain of a traditional structure connected to the middle beam body 600).

[0099] It should be noted that the front beam body 700 and the middle beam body 600 are both hard structures made of steel. The front beam body 700 is fixedly connected to the front cross beam 3 , and the middle beam body 600 is fixedly connected to the door curtain body 500 .

[0100] The front beam body 700 includes a front bow beam 701 and a front mounting beam 702. The top of the front bow beam 701 is fixedly connected to the front cross beam 3, and the bottom of the front bow beam 701 is connected to the front mounting beam 702. The front mounting beam 702 is horizontally arranged.

[0101] The middle beam body 600 includes a middle arch beam 601 and a middle mounting beam 602 . The top of the middle arch beam 601 is fixedly connected to the door curtain body 500 , and the bottom of the middle arch beam 601 is connected to the middle mounting beam 602 . The middle mounting beam 602 is horizontally arranged.

[0102] The front mounting beam 702 is provided with a front vertical drive assembly 10, and the front vertical drive assembly 10 is rigidly connected to the front end of the sliding beam 1 to drive the front end of the sliding beam 1 to move in the vertical direction. The front mounting beam 702 is also provided with a front horizontal drive assembly 20 to drive the front vertical drive assembly 10 to move with the front end of the sliding beam 1 in the horizontal direction.

[0103] Similar to the structure of the front vertical drive assembly 10 provided on the front mounting beam 702, a middle vertical drive assembly 30 is provided on the middle mounting beam 602, and the middle vertical drive assembly 30 is rigidly connected to the rear end of the sliding beam 1 to drive the rear end of the sliding beam 1 to move in the vertical direction. Similar to the structure of the front horizontal drive assembly 20 provided on the front mounting beam 702, a middle horizontal drive assembly 40 is also provided on the middle mounting beam 602 to drive the middle vertical drive assembly 30 to move the rear end of the sliding beam 1 in the horizontal direction.

[0104] The sliding beam 1 is driven to move horizontally by the front horizontal driving component 20 and the middle horizontal driving component 40. When the mold is opened, the straight plate part of the outer mold 301 (the straight plate part of the outer mold 301 refers to the part of the outer mold 301 set in the vertical direction) can be separated from the outer side surface of the box beam 400. When the template moves forward, the resistance is small and the outer side surface of the box beam 400 will not be scratched.

[0105] By setting the front beam body 700 and the middle beam body 600 as the installation platform, and the front vertical driving assembly 10 and the middle vertical driving assembly 30 for driving the sliding beam 1 to move up and down are rigidly connected to the sliding beam 1, the outer mold 301 runs smoothly and is not easy to shake during the forward movement of the template.

[0106] In this embodiment, the front vertical drive assembly 10 includes a front slide plate 11, a front vertical worm seat 12, and a front vertical worm 13. The front slide plate 11 is slidably matched with the front mounting beam 702. The front vertical worm seat 12 is arranged on the front slide plate 11. The top of the front vertical worm 13 is connected to the front end of the sliding beam 1.

[0107] The front slide plate 11 can slide horizontally on the front mounting beam 702 along the mold opening and closing direction. The front vertical worm seat 12 is fixedly connected to the front slide plate 11. By rotating the handle on the front vertical worm seat 12, the front vertical worm 13 can be driven to extend or shorten, thereby driving the front end of the sliding beam 1 to rise or fall.

[0108] The front horizontal drive assembly 20 includes a front horizontal worm seat 21, a front horizontal worm 22, and a front supporting block 23. The front supporting block 23 is fixedly connected to the front mounting beam 702. The front horizontal worm seat 21 and the front horizontal worm 22 are arranged between the front supporting block 23 and the front slide plate 11.

[0109] The front horizontal worm seat 21 is fixedly connected to the front slide 11, and the front horizontal worm 22 is fixedly connected to the front supporting block 23. By rotating the handle on the front horizontal worm seat 21, the front horizontal worm 22 can be driven to extend or shorten, thereby driving the front slide 11 to move horizontally in the mold opening and closing direction.

[0110] In this embodiment, the middle vertical drive assembly 30 includes a middle slide plate 31, a middle vertical worm seat 32, and a middle vertical worm 33. The middle slide plate 31 is slidably matched with the middle mounting beam 602. The middle vertical worm seat 32 is arranged on the middle slide plate 31. The top of the middle vertical worm 33 is connected to the rear end of the sliding beam 1.

[0111] The middle slide plate 31 can slide horizontally on the middle mounting beam 602 along the mold opening and closing direction. The middle vertical worm seat 32 is fixedly connected to the middle slide plate 31. By rotating the handle on the middle vertical worm seat 32, the middle vertical worm 33 can be driven to extend or shorten, thereby driving the rear end of the sliding beam 1 to rise or fall.

[0112] The middle horizontal driving assembly 40 includes a middle horizontal worm seat 41, a middle horizontal worm 42, and a middle supporting block 43. The middle supporting block 43 is fixedly connected to the middle mounting beam 602. The middle horizontal worm seat 41 and the middle horizontal worm 42 are arranged between the middle supporting block 43 and the middle slide plate 31.

[0113] The middle horizontal worm seat 41 is fixedly connected to the middle supporting block 43, and the middle horizontal worm 42 is fixedly connected to the middle slide plate 31. By rotating the handle on the middle horizontal worm seat 41, the middle horizontal worm 42 can be driven to extend or shorten, thereby driving the middle slide plate 31 to move horizontally in the mold opening and closing direction.

[0114] In this embodiment, two sliding beams 1 are correspondingly provided on each side of the outer mold 301. The two sliding beams 1 on the same side are arranged in parallel and spaced apart. The front ends of the two sliding beams 1 are fixedly connected by screws and nuts, and the rear ends of the two sliding beams 1 are also fixedly connected by screws and nuts to connect the two sliding beams 1 into one.

[0115] When performing the mold opening operation, first disconnect the high-precision rolled threaded steel bar 2 connected to the sliding beam 1, then rotate the handles on the front vertical worm seat 12 and the middle vertical worm seat 32 to lower the sliding beam 1, thereby allowing the top of the outer mold 301 to leave the bottom of the flange 401 of the box beam 400, and then rotate the handles on the front horizontal worm seat 21 and the middle horizontal worm seat 41 to move the sliding beam 1 horizontally outward, thereby separating the straight plate part of the outer mold 301 from the outer side of the box beam 400.

[0116] When performing the mold closing operation, the handles on the front horizontal worm seat 21 and the middle horizontal worm seat 41 are rotated in the opposite direction to move the sliding beam 1 horizontally inward, so that the straight plate part of the outer mold 301 reaches the extended position on the outer side of the box beam 400, and then the handles on the front vertical worm seat 12 and the middle vertical worm seat 32 are rotated in the opposite direction to raise the sliding beam 1, so that the top of the outer mold 301 reaches the height of the bottom of the flange 401 of the box beam 400, and the front end of the sliding beam 1 is anchored to the front cross beam 3 with the fine-rolled threaded steel bar 2, and the rear end of the sliding beam 1 is anchored to the built box beam 400, and concrete pouring can be carried out again.

[0117] The portable bridge-building machine disclosed in the present invention is provided with a front horizontal driving assembly 20 and a middle horizontal driving assembly 40 for driving the sliding beam 1 to move horizontally. When the mold is opened, the straight plate part of the outer mold 301 can be separated from the outer side surface of the box beam 400. When the template moves forward, the resistance is small and the outer side surface of the box beam 400 will not be scratched. By setting the front beam body 700 and the middle beam body 600 as the installation platform, and the front vertical driving assembly 10 and the middle vertical driving assembly 30 for driving the sliding beam 1 to move up and down are rigidly connected to the sliding beam 1, the outer mold 301 runs smoothly and is not easy to shake when the template moves forward.

[0118] In the prior art, the door curtain of the bridge-building machine is a fixed truss structure.

[0119] The disadvantages are: the door curtain of the fixed structure is large in size and inconvenient to transport; when the bridge-building machine is used to build bridges of different widths, the spacing between the two sets of main trusses needs to be adjusted to adapt to the current bridge specifications. Since the width of the door curtain of the fixed structure cannot be adjusted, the door curtain can only be manufactured separately according to the main truss spacing required by different bridge specifications, and the versatility of the door curtain is poor.

[0120] See also Figures 15 to 17 In this embodiment, the portable bridge-building machine further comprises a folding door curtain, which comprises two groups of door curtain bodies 500 arranged in mirror symmetry, and a connecting mechanism arranged between the two groups of door curtain bodies 500, wherein the connecting mechanism can adjust the distance between the two groups of door curtain bodies 500, so that the width of the folding door curtain is adjustable;

[0121] Each group of the door curtain bodies 500 includes two lower beams 501 arranged in parallel and spaced apart, and an upper beam 502 located between the two lower beams 501 , and a plurality of first connecting rods 503 are provided between the upper beam 502 and the lower beams 501 , and the first connecting rods 503 are hingedly connected to the lower beams 501 and the upper beams 502 , so that the upper beam 502 can be folded and stored between the two lower beams 501 .

[0122] Before the door curtain body 500 is installed on the main truss 200, the connection mechanism and the fixing rod 507 are removed, and the upper crossbeam 502 and the first connecting rod 503 can be folded and stored between the two lower crossbeams 501, which has a small volume and is convenient for transportation.

[0123] After the door curtain bodies 500 are installed on the main truss 200 , the distance between the two groups of door curtain bodies 500 can be adjusted through the connection mechanism, so that the distance between the main truss 200 can be adjusted.

[0124] In this embodiment, the upper cross beams 502 of the two groups of door curtain bodies 500 are both provided with a fixing plate 504 , and the connecting mechanism includes a first screw rod 505 and a connecting plate 506 .

[0125] The first screw 505 is arranged to pass through the through hole on the fixing plate 504 and is connected to the fixing plate 504 through a nut, so that the spacing between the upper sides of the two groups of door curtain bodies 500 can be adjusted through the fixed position of the first screw 505 and the fixing plate 504. Specifically, the nut is threadedly matched with the first screw 505, and a nut is provided on both sides of the fixing plate 504 to fix the first screw 505 on the fixing plate 504. The fixed position of the first screw 505 and the fixing plate 504 can be adjusted by adjusting the position of the nut on the first screw 505, thereby adjusting the spacing between the upper sides of the two groups of door curtain bodies 500.

[0126] The connecting plate 506 is provided with a plurality of connecting holes 5061 at intervals. The connecting plate 506 is connected to the lower cross beam 501 by bolts matched with the connecting holes 5061, so that the spacing between the lower sides of the two groups of door curtain bodies 500 can be adjusted by selecting the connecting holes 5061. Specifically, the plurality of connecting holes 5061 are arranged at intervals in the length direction of the connecting plate 506. If the spacing between the lower sides of the two groups of door curtain bodies 500 is to be reduced, the connecting holes 5061 with a closer distance are selected to install bolts to connect the connecting plate 506 and the lower cross beam 501 together. Conversely, if the spacing between the lower sides of the two groups of door curtain bodies 500 is to be increased, the connecting holes 5061 with a farther distance are selected to install bolts to connect the connecting plate 506 and the lower cross beam 501 together.

[0127] In other embodiments, the connection plates 506 of corresponding lengths may be customized according to the spacing of the main trusses 200 required by different bridge specifications, and the spacing of the lower side of the door curtain body 500 may be adjusted by replacing the connection plates 506 of different lengths, thereby achieving the spacing adjustment of the main trusses 200. The connection plates 506 are cheap and will not increase the cost too much.

[0128] In this embodiment, the door curtain body 500 further includes a fixing rod 507 to form a triangular structure with the first connecting rod 503 and the upper cross beam 502 .

[0129] The two ends of the fixing rod 507 are connected to the upper crossbeam 502 and the lower crossbeam 501 respectively by bolts, and the structure of the door curtain body 500 is strengthened by the stability of the triangular structure.

[0130] In this embodiment, the door curtain body 500 also includes a connector 508 for fixing the upper cross beam 502 on the vertical rod 201 of the main truss 200, and the connector 508 includes a large end for limiting and a small end for connecting with the upper cross beam 502, and a plurality of first pin holes 5081 are provided at intervals on the small end, and a plurality of second pin holes 5021 are provided on the upper cross beam 502.

[0131] In this embodiment, the lower cross beam 501 is provided with a mounting hole 5011 for connecting with the main truss 200 .

[0132] When installing the folding door curtain, the lower crossbeam 501 is fixed to the vertical pole 201 of the main truss 200 by means of bolts passing through the mounting holes 5011, the small end of the connector 508 is passed through the through hole on the vertical pole 201 (the diameter of the large end of the connector 508 is larger than the through hole), the tubular end of the upper crossbeam 502 is sleeved with the small end of the connector 508, and the connector 508 is connected to the upper crossbeam 502 by means of positioning pins passing through the first pin hole 5081 and the second pin hole 5021. After the upper crossbeam 502, the lower crossbeam 501 and the vertical pole 201 are connected, a suitable connecting hole 5061 is selected on the connecting plate 506, the connecting plate 506, the lower crossbeam 501 and the lower end of the fixing rod 507 are hingedly connected by bolts, the upper end of the fixing rod 507 is connected to the upper crossbeam 502 by means of bolts, and the position of the nut on the first screw rod 505 is adjusted to tighten the upper sides of the two sets of door curtain bodies 500.

[0133] The folding door curtain is composed of two groups of foldable door curtain bodies 500. After the connecting mechanism is removed and the door curtain bodies 500 are folded, the door curtain has a smaller volume and is convenient for transportation. At the same time, the distance between the main trusses 200 can be adjusted through the connecting mechanism with adjustable distance between the door curtain bodies 500, which has good versatility.

[0134] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation modes, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present invention.

Claims

1. A portable bridge-building machine, comprising a main truss and a traveling mechanism, characterized in that: The walking mechanism includes a lifting cylinder, a walking wheel, a track beam, and a front support. The first cylinder body of the lifting cylinder is fixedly connected to the main truss, the walking wheel is connected to the first piston rod of the lifting cylinder, the track beam is arranged below the walking wheel, and the front support is fixedly arranged at the bottom of the main truss.

2. The portable bridge-building machine according to claim 1, characterized in that: The main truss comprises a telescopic beam, which comprises a bottom chord beam, an outer beam, and an inner beam which are sequentially sleeved from the outside to the inside, and also comprises a telescopic oil cylinder located inside the inner beam, the front end of the second piston rod of the telescopic oil cylinder is connected and fixed to the bottom chord beam, the front end of the second cylinder body of the telescopic oil cylinder is connected and fixed to the outer beam, the rear end of the second cylinder body is provided with a pulley, a transmission rope is wound around the pulley, and two ends of the transmission rope are respectively fixedly connected to the front end of the bottom chord beam and the front end of the inner beam; The second piston rod is provided with a joint portion for connecting the oil pipe near the front end, and the joint portion is communicated with the interior of the second cylinder body through a first oil hole and a second oil hole opened in the second piston rod.

3. The portable bridge-building machine according to claim 1, characterized in that: It also includes a reverse wheel anti-overturning mechanism, which includes a rear beam body, and the rear beam body includes a rear cross beam, a rear bow beam, and a rear mounting beam; The rear cross beam is arranged across the built box beam and pressed on the rear part of the main truss, the rear bow beam is located on both sides of the rear cross beam, the upper end of the rear bow beam is fixedly connected to the rear cross beam, the lower end of the rear bow beam extends to the bottom of the flange of the built box beam, the rear mounting beam is connected to the rear bow beam, and the rear mounting beam is provided with a buckle wheel for cooperating with the bottom surface of the flange of the built box beam; It also includes a first connecting member so that the rear beam can move synchronously with the main truss.

4. The portable bridge-building machine according to claim 3 is characterized in that: The anti-overturning mechanism of the reverse-knob wheel also includes a rear pressure beam, which is press-fitted and arranged at the rear of the main truss, and the rear pressure beam is anchored and connected to the built box beam through precision-rolled threaded steel bars.

5. The portable bridge-building machine according to claim 1, characterized in that: It also includes a mold opening and closing mechanism; The mold opening and closing mechanism includes a sliding beam for carrying the outer mold, and also includes a front beam body and a middle beam body. The front beam body is arranged on both sides of the front cross beam, and the middle beam body is arranged on both sides of the door curtain. The front beam body comprises a front bow beam and a front mounting beam, the top of the front bow beam is fixedly connected to the front cross beam, the bottom of the front bow beam is connected to the front mounting beam, and the front mounting beam is horizontally arranged; The middle beam body includes a middle arch beam and a middle mounting beam, the top of the middle arch beam is fixedly connected to the door curtain, the bottom of the middle arch beam is connected to the middle mounting beam, and the middle mounting beam is horizontally arranged; The front mounting beam is provided with a front vertical drive assembly, which is rigidly connected to the front end of the sliding beam to drive the front end of the sliding beam to move in the vertical direction. The front mounting beam is also provided with a front horizontal drive assembly to drive the front vertical drive assembly to move with the front end of the sliding beam in the horizontal direction. A middle vertical drive assembly is provided on the middle mounting beam, and the middle vertical drive assembly is rigidly connected to the rear end of the sliding beam to drive the rear end of the sliding beam to move in the vertical direction. A middle horizontal drive assembly is also provided on the middle mounting beam to drive the middle vertical drive assembly to move with the rear end of the sliding beam in the horizontal direction.

6. The portable bridge-building machine according to claim 5, characterized in that: The front vertical drive assembly includes a front slide plate, a front vertical worm seat, and a front vertical worm, wherein the front slide plate is slidably matched with the front mounting beam, the front vertical worm seat is arranged on the front slide plate, and the top of the front vertical worm is connected to the front end of the sliding beam; The front horizontal driving assembly includes a front horizontal worm seat, a front horizontal worm, and a front supporting block. The front supporting block is fixedly connected to the front mounting beam. The front horizontal worm seat and the front horizontal worm are arranged between the front supporting block and the front slide plate.

7. The portable bridge-building machine according to claim 5, characterized in that: The middle vertical drive assembly comprises a middle slide plate, a middle vertical worm seat, and a middle vertical worm, wherein the middle slide plate is slidably matched with the middle mounting beam, the middle vertical worm seat is arranged on the middle slide plate, and the top of the middle vertical worm is connected to the rear end of the sliding beam; The middle horizontal driving assembly includes a middle horizontal worm seat, a middle horizontal worm, and a middle supporting block. The middle supporting block is fixedly connected to the middle mounting beam. The middle horizontal worm seat and the middle horizontal worm are arranged between the middle supporting block and the middle slide plate.

8. The portable bridge-building machine according to claim 1, characterized in that: Also included is a folding door curtain, the folding door curtain comprising two groups of door curtain bodies arranged in mirror symmetry, and a connecting mechanism arranged between the two groups of door curtain bodies, the connecting mechanism can adjust the distance between the two groups of door curtain bodies, so that the width of the folding door curtain is adjustable; Each group of the door curtain bodies includes two lower beams arranged in parallel and at intervals, and an upper beam located between the two lower beams, and a plurality of first connecting rods are arranged between the upper beam and the lower beams, and the first connecting rods are hingedly connected to the lower beam and the upper beam, so that the upper beam can be folded and stored between the two lower beams.

9. The portable bridge-building machine according to claim 8, characterized in that: The upper cross beams of the two groups of door curtain bodies are both provided with a fixing plate, and the connecting mechanism comprises a first screw rod and a connecting plate; The first screw rod passes through the through hole on the fixing plate and is connected to the fixing plate through a nut, so that the distance between the upper sides of the two sets of door curtain bodies can be adjusted through the fixed position of the first screw rod and the fixing plate; The connecting plate is provided with a plurality of connecting holes at intervals, and the connecting plate is connected to the lower cross beam via bolts matched with the connecting holes, so that the distance between the lower sides of the two groups of door curtain bodies can be adjusted by selecting the connecting holes.

10. The portable bridge-building machine according to claim 8, characterized in that: The door curtain body also includes a connector for fixing the upper cross beam on the main truss uprights, the connector includes a large end for limiting and a small end for connecting with the upper cross beam, a plurality of first pin holes are arranged at intervals on the small end, and a plurality of second pin holes are arranged on the upper cross beam.

Images