Contracting and overlapping type tunnel construction trolley

Abstract

The utility model provides a contraction overlapping type tunnel construction trolley, which relates to the field of tunnel construction machinery and comprises a trolley body, a jacking platform, a temporary supporting mechanism and a trestle. The jacking platform is fixed to the vehicle body and can ascend and descend relative to the top of the tunnel face. The temporary supporting mechanism is installed on the jacking platform, and the temporary supporting mechanism and the jacking platform are slidably matched in the horizontal direction so that the temporary supporting mechanism can be supported on the bottom face of the tunnel after extending out of the tail of the vehicle body; the trestle is matched with the temporary supporting mechanism in a liftable mode, and the trestle can be lowered to the bottom face of the tunnel after the temporary supporting mechanism is supported on the bottom face of the tunnel. The vehicle body can walk to a trestle which is placed on the bottom face of a tunnel. The trolley is high in mechanization degree, labor-saving and convenient to operate and control and high in environment adaptability.

Description

Technical Field

[0001] The utility model relates to the field of tunnel construction machinery, in particular to a shrinkable and overlapping tunnel construction trolley. Background Art

[0002] A tunnel is a building built underground, underwater or in a mountain for laying railways or building roads for motor vehicles to pass through. According to its location, it can be divided into three categories: mountain tunnels, underwater tunnels and urban tunnels. A mountain tunnel is a tunnel that passes under mountains or hills to shorten the distance and avoid steep slopes; an underwater tunnel is a tunnel that passes under a river or seabed to cross a river or strait; an urban tunnel is a tunnel that passes underground in a city to meet the needs of railways passing through large cities. The construction process of a tunnel mainly includes tunnel planning, surveying, design, penetration control measurement and construction. During the construction process, in order to ensure safety, it is generally necessary to use a trolley to support the tunnel, and the operators rely on the trolley to carry out construction operations such as charging, clearing dangers, erecting frames or hanging mesh.

[0003] In the prior art, the trolley is generally pushed to the set position manually, and some uneven ground areas in the tunnel are beyond the reach of the trolley, which limits construction. Utility Model Content

[0004] The utility model aims to provide a retractable and overlapping tunnel construction trolley, which can improve the degree of mechanization, improve the safety of operation, and be flexible in construction and adaptable to various working conditions.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a retractable and overlapping tunnel construction trolley, comprising:

[0007] A car body, a lifting platform, a temporary support mechanism and a trestle; the lifting platform is fixed on the car body, and the lifting platform can be raised and lowered relative to the top of the tunnel face; the temporary support mechanism is installed on the lifting platform, and the temporary support mechanism and the lifting platform can be slidably matched in the horizontal direction so that they can be supported on the bottom surface of the tunnel after extending out of the tail of the car body; the trestle and the temporary support mechanism can be raised and lowered, and the trestle can be lowered to the bottom surface of the tunnel after being supported by the temporary support mechanism on the bottom surface of the tunnel; the car body can walk onto the trestle lowered on the bottom surface of the tunnel.

[0008] In an optional embodiment, the jacking platform includes multiple layers of jacking brackets, which are stacked in sequence, and the jacking brackets located at the bottom layer are fixedly connected to the vehicle body, and the jacking bracket located above two adjacent jacking brackets can be lifted and matched with the jacking bracket located below.

[0009] Based on the above solution, by setting up multiple layers of jacking brackets, except for the bottom jacking bracket connected to the vehicle body which cannot be height adjusted, the jacking brackets above the bottom jacking bracket can be height adjusted as needed, with a wide adjustment range.

[0010] In an optional embodiment, the temporary supporting mechanism is slidably matched with the jacking support at the bottom layer in the horizontal direction.

[0011] Based on the above solution, the temporary support mechanism is connected to the jacking bracket whose height is not adjustable. The temporary support mechanism will not rise or fall with the jacking bracket. The temporary support mechanism can only slide relative to the jacking mechanism in the horizontal direction, and the operation is stable and reliable.

[0012] In an optional embodiment, the retractable and overlapping tunnel construction trolley also includes a first gear drive mechanism, which includes a first motor, a first drive gear and a first transmission rack. The first motor is fixed to the bottom layer of the jacking bracket, the first drive gear is fixedly connected to the output shaft of the first motor, the first transmission rack is fixedly connected to the temporary support mechanism, and the first gear is meshed with the first transmission rack.

[0013] Based on the above scheme, when it is necessary to adjust the position of the temporary support mechanism relative to the vehicle body in the horizontal direction, the first motor is started, the first motor drives the first drive gear to rotate, the first drive gear engages with the first transmission rack, thereby driving the first transmission rack to slide in the horizontal direction, the first transmission rack is connected to the temporary support mechanism, and finally drives the temporary support mechanism to slide in the horizontal direction, which is convenient and flexible to operate.

[0014] In an optional embodiment, the temporary support mechanism includes a slide, a support leg and a diagonal brace, the slide is slidably matched with the jacking platform in the horizontal direction, the support leg is rotatably connected to the slide, one end of the diagonal brace is rotatably connected to the slide, and the other end is unlockably connected to the support leg.

[0015] Based on the above scheme, when the temporary support mechanism slides horizontally to the set position, the support legs are rotated and opened relative to the slide, and then the diagonal braces are connected to the slide and the support legs at the same time to reinforce the support legs and improve the support stability of the support legs. At the same time, during the horizontal sliding process of the temporary support mechanism, the support legs are in a folded state, which is not easy to interfere with other components, which is conducive to the horizontal movement of the temporary support mechanism.

[0016] In an optional embodiment, a fastener is provided on the diagonal brace, and the diagonal brace is unlockably connected to the supporting leg via the fastener.

[0017] Based on the above scheme, the fasteners can be pins or bolts, etc. When the supporting legs are unfolded, the fasteners are used to fix the ends of the diagonal braces to the supporting legs. The connection between the diagonal braces and the supporting legs is firm and reliable, the position of the supporting legs is stable and reliable, and the support safety is high.

[0018] In an optional embodiment, the temporary support mechanism further includes a suspension unit, wherein the suspension unit is fixed to the slide, the trestle is detachably connected to the suspension unit, and the suspension unit is used to lower or lift the trestle.

[0019] Based on the above solution, when the temporary support mechanism is extended to the set position, the trestle is lowered using the suspension unit, which is convenient and labor-saving to operate.

[0020] In an optional embodiment, the suspension unit is configured as an electric hoist or a winch.

[0021] Based on the above scheme, the suspension unit has a simple structure, is easy to install, easy to operate, and has high stability and safety. After the suspension mechanism lowers the trestle to the bottom of the tunnel, the connection between the suspension unit and the trestle is disassembled, the temporary support mechanism is separated from the trestle, and the temporary support mechanism can be retracted into the vehicle body, occupying a small space, which is conducive to the movement of the vehicle body in the tunnel.

[0022] In an optional embodiment, the trestle includes a load-bearing bridge plate and a support frame, wherein the support frame is fixed to the load-bearing bridge plate and is used to contact the bottom surface of the tunnel; the load-bearing bridge plate and the slide frame are slidably matched in the vertical direction, and the load-bearing bridge plate and the suspension unit are detachably connected.

[0023] Based on the above scheme, when the trestle is lowered to the bottom of the tunnel by the suspension unit, the support frame is supported on the bottom of the tunnel, and the load-bearing bridge plate is basically arranged horizontally, which is conducive to the vehicle body walking on the trestle.

[0024] In an optional embodiment, the lifting bracket includes a base frame, an unfolding frame and a second gear drive mechanism; the base frames of adjacent lifting brackets are connected, and the unfolding frame is slidably matched with the base frame in the horizontal direction; the second gear drive mechanism includes a second motor, a second drive gear and a second transmission rack, the second motor is fixed to the base frame, the second drive gear is fixed to the output shaft of the second motor, the second transmission rack is fixed to the unfolding frame, and the second drive gear is meshed with the second transmission rack.

[0025] Based on the above solution, the lifting bracket can not only achieve height adjustment, but also, after the height adjustment, can drive the deployment frame to be deployed relative to the vehicle body through the second gear drive mechanism, thereby increasing the area for the operator to stand and expanding the operating range of the operator. It should be understood that the number of deployment frames can be two, and the two deployment frames are deployed from both sides in the width direction of the vehicle body respectively, further expanding the operating area.

[0026] The beneficial effects of the embodiments of the utility model are:

[0027] In summary, the shrinkable and superimposed tunnel construction trolley provided in the present embodiment, when in use, first drives the car body to the edge with a recessed position, makes the tail of the car body face the recessed position, makes the temporary support mechanism move horizontally outward from the rear of the car and stretches out, when the temporary support mechanism is stretched out, the temporary support mechanism is supported at the bottom of the tunnel. Then, the trestle is lowered from the temporary support mechanism, and the trestle is supported at the bottom of the tunnel. Next, the temporary support mechanism is retracted into the car body. At this point, the erection of the trestle is completed. A trestle is provided at the recessed position at the bottom of the tunnel, and the car body can be driven onto the trestle, so that the jacking platform is transported to the area to be operated, and the jacking platform is raised according to demand, and the construction personnel can rely on the support of the jacking platform to perform related operations inside the tunnel. After the construction is completed, the temporary support mechanism extends out, and the trestle is retracted onto the temporary support mechanism, and finally the temporary support mechanism and the trestle are recovered into the car body together, which can be repeatedly used, and the construction cost is low. At the same time, the construction trolley can move to the set position according to needs, and the transfer is flexible and convenient, saving time and effort, and is less affected by environmental factors and has a wide construction range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a retractable and overlapping tunnel construction trolley according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 3 A schematic diagram of a state of a retractable and overlapping tunnel construction trolley according to an embodiment of the utility model;

[0032] Figure 4A schematic diagram of another state of the retractable and overlapping tunnel construction trolley according to an embodiment of the utility model;

[0033] Figure 5 It is a schematic diagram of another state of the shrinkable and superimposed tunnel construction trolley according to an embodiment of the utility model;

[0034] Figure 6 It is a schematic diagram of a forward state of a shrinkable and overlapping tunnel construction trolley according to an embodiment of the utility model;

[0035] Figure 7 It is a schematic diagram of another forward state of the shrinkable and superimposed tunnel construction trolley according to an embodiment of the utility model;

[0036] Figure 8 for Figure 7 Schematic diagram of the partial enlargement of point B in the middle.

[0037] icon:

[0038] 001-span; 002-recessed position; 100-car body; 200-lifting platform; 210-lifting bracket; 211-base frame; 212-unfolding frame; 213-second gear drive mechanism; 2131-second motor; 2132-second drive gear; 2133-second transmission rack; 300-temporary support mechanism; 310-slide; 320-support leg; 330-diagonal brace; 340-fastener; 350-suspension unit; 400-trestles; 410-bearing bridge plate; 420-support frame; 500-first gear drive mechanism; 510-first motor; 520-first drive gear; 530-first transmission rack. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the prior art, the trolley is generally constructed by a steel structure frame, and in order to facilitate the movement of the trolley, a walking wheel is installed at the bottom of the steel structure frame. When the trolley moves, it is generally pushed manually, which is time-consuming and labor-intensive, and inefficient. In addition, the trolley can generally only walk and support on a horizontal surface, and the support effect is poor on uneven locations, which limits its use.

[0046] In view of this, the designer provides a retractable and overlapping tunnel construction trolley that can be driven to a set position, is easy and quick to move, can adapt to the construction environment, is less affected by construction environment factors, and has a wide construction range.

[0047] Please combine Figure 1-Figure 8In this embodiment, the retractable and superimposed tunnel construction trolley includes a car body 100, a jacking platform 200, a temporary support mechanism 300 and a trestle 400. The jacking platform 200 is fixed on the car body 100, and the jacking platform 200 can be raised and lowered relative to the top of the tunnel face 001; the temporary support mechanism 300 is installed on the jacking platform 200, and the temporary support mechanism 300 and the jacking platform 200 can be slidably matched in the horizontal direction, so that they can be supported on the bottom surface of the tunnel after extending out of the tail of the car body 100; the trestle 400 and the temporary support mechanism 300 can be raised and lowered, and the trestle 400 can be lowered to the bottom surface of the tunnel after the temporary support mechanism 300 is supported on the bottom surface of the tunnel; the car body 100 can walk to the trestle 400 lowered on the bottom surface of the tunnel.

[0048] Based on the above, the working principle of the retractable and superimposed tunnel construction trolley provided in this embodiment is as follows:

[0049] When in use, first drive the car body 100 to the edge with the recessed position 002, make the tail of the car body 100 face the recessed position 002, make the temporary support mechanism 300 move horizontally outward from the rear of the car and stretch out, when the temporary support mechanism 300 is stretched out, the temporary support mechanism 300 is supported at the bottom of the tunnel. Then, put down the trestle 400 from the temporary support mechanism 300, and support the trestle 400 at the bottom of the tunnel. Next, retract the temporary support mechanism 300 into the car body 100. At this time, the erection of the trestle 400 is completed. The recessed position 002 at the bottom of the tunnel is provided with the trestle 400, and the car body 100 can be driven onto the trestle 400, so that the jacking platform 200 is transported to the area to be operated, and the jacking platform 200 is raised according to the demand, and the construction personnel can rely on the support of the jacking platform 200 to perform relevant operations inside the tunnel. After the construction is completed, the temporary support mechanism 300 is extended, and the trestle 400 is retracted onto the temporary support mechanism 300, and finally the temporary support mechanism 300 and the trestle 400 are recovered together into the vehicle body 100, which can be repeatedly used multiple times, and the construction cost is low. At the same time, the construction trolley can move to the set position according to the needs, and the transfer is flexible and convenient, saving time and labor, and is less affected by environmental factors and has a wide construction range.

[0050] The following embodiments illustrate the details of the retractable and overlapping tunnel construction trolley provided in the present application by way of examples.

[0051] Please combine Figure 6In this embodiment, the jacking platform 200 optionally includes multiple layers of jacking brackets 210, which are stacked in sequence, and the jacking bracket 210 at the bottom is fixedly connected to the car body 100, and the jacking bracket 210 located above the two adjacent jacking brackets 210 can be lifted and lowered to cooperate with the jacking bracket 210 located below. For example, in this embodiment, the jacking bracket 210 is set to four layers, wherein the jacking bracket 210 at the bottom is fixed to the car body 100. The jacking bracket 210 at the bottom may not be lifted or lowered, or may be lifted or lowered after the trestle 400 is lowered and the temporary support mechanism 300 is recovered. By setting up multiple layers of jacking brackets 210, except for the jacking bracket 210 at the bottom that is connected to the car body 100, which is generally not height-adjustable, the jacking brackets 210 above the jacking bracket 210 at the bottom can be height-adjusted as needed, with a wide adjustment range and a wide construction area.

[0052] Optionally, the temporary support mechanism 300 is slidably matched with the bottommost lifting bracket 210 in the horizontal direction. The temporary support mechanism 300 is connected to the lifting bracket 210 whose height is not adjustable, and the temporary support mechanism 300 will not rise or fall with the lifting bracket 210. The temporary support mechanism 300 can only slide relative to the lifting mechanism in the horizontal direction, and the operation is stable and reliable.

[0053] It should be understood that a guide structure may be provided between the temporary support mechanism 300 and the lifting bracket 210 so that the temporary support mechanism 300 can slide more stably.

[0054] Please combine Figure 6-Figure 8 In this embodiment, optionally, the lifting bracket 210 includes a base frame 211, an unfolding frame 212 and a second gear driving mechanism 213; the base frames 211 of adjacent lifting brackets 210 are connected, and a telescoping device such as a cylinder or a hydraulic cylinder can be set between adjacent base frames 211, so as to drive the upper base frame 211 to rise and fall relative to the lower base frame 211. The unfolding frame 212 and the base frame 211 can be slidably matched in the horizontal direction. The second gear driving mechanism 213 includes a second motor 2131, a second driving gear 2132 and a second transmission rack 2133, the second motor 2131 is fixed on the base frame 211, the second driving gear 2132 is fixed on the output shaft of the second motor 2131, the second transmission rack 2133 is fixed on the unfolding frame 212, and the second driving gear 2132 is meshed with the second transmission rack 2133.

[0055] With such a design, the lifting bracket 210 can not only realize height adjustment, but also, after the height adjustment, can drive the deployment frame 212 to be deployed relative to the vehicle body 100 through the second gear drive mechanism 213, thereby increasing the area for the operator to stand and expanding the operating range of the operator. It should be understood that the number of the deployment frames 212 can be two, and the two deployment frames 212 are deployed from both sides in the width direction of the vehicle body 100, respectively, to further expand the operating area.

[0056] Please combine Figure 1-Figure 3 In this embodiment, optionally, the temporary support mechanism 300 includes a slide 310, a support leg 320, a diagonal brace 330 and a fastener 340. The slide 310 is slidably matched with the lifting platform 200 in the horizontal direction. Specifically, the slide 310 is slidably matched with the base frame 211 of the bottom lifting bracket 210 in the horizontal direction. The support leg 320 is rotatably connected to the slide 310, one end of the diagonal brace 330 is rotatably connected to the slide 310, and the other end is unlockably connected to the support leg 320 through the fastener 340. When the temporary support mechanism 300 slides horizontally to the set position, the support leg 320 is rotated and opened relative to the slide 310, and then the diagonal brace 330 is simultaneously connected to the slide 310 and the support leg to reinforce the support leg 320 and improve the support stability of the support leg 320. Meanwhile, during the horizontal sliding of the temporary support mechanism, the support legs 320 are in a folded state and are not likely to interfere with other components, which is beneficial to the horizontal movement of the temporary support mechanism 300 .

[0057] It should be understood that there can be multiple supporting legs 320 to improve the supporting stability. Moreover, each supporting leg 320 can be configured as a telescopic leg, for example, the supporting leg 320 is a hydraulic cylinder structure, which is conducive to adjusting the length of the supporting leg 320 to adapt to the support of the recessed position 002 of different depths.

[0058] In addition, the support leg 320 may be driven by a pneumatic cylinder or a hydraulic cylinder to rotate relative to the slide 310 .

[0059] Optionally, the fastener 340 may be a latch or a bolt, etc. After the height adjustment of the support leg 320 is completed, the diagonal brace 330 is rotated to align the hole on the diagonal brace 330 with the hole on the support leg 320, and the fastener 340 is inserted into the two holes. It should be understood that when the support leg 320 is a telescopic structure, the support leg 320 has a fixed portion and a telescopic portion, the fixed portion is rotatably matched with the slide 310, and the telescopic portion can slide relative to the fixed portion to adjust the height. The diagonal brace 330 is detachably connected to the fixed portion. The fixed portion and the telescopic portion can be driven to telescope by a cylinder or a hydraulic cylinder.

[0060] Please combine Figure 1 and Figure 2In this embodiment, optionally, the retractable and overlapping tunnel construction trolley also includes a first gear drive mechanism 500, which includes a first motor 510, a first drive gear 520 and a first transmission rack 530. The first motor 510 is fixed to the bottom-level lifting bracket 210, the first drive gear 520 is fixedly connected to the output shaft of the first motor 510, the first transmission rack 530 is fixedly connected to the slide 310 of the temporary support mechanism 300, and the first gear is meshed with the first transmission rack 530.

[0061] In this way, when it is necessary to adjust the position of the temporary support mechanism 300 relative to the vehicle body 100 in the horizontal direction, the first motor 510 is started, the first motor 510 drives the first drive gear 520 to rotate, the first drive gear 520 engages with the first transmission rack 530, thereby driving the first transmission rack 530 to slide in the horizontal direction, the first transmission rack 530 is connected to the temporary support mechanism 300, and finally drives the temporary support mechanism 300 to slide in the horizontal direction, and the operation is convenient and flexible.

[0062] Please combine Figure 3 In this embodiment, the temporary support mechanism 300 may further include a suspension unit 350, which is fixed to the slide 310. The trestle 400 is detachably connected to the suspension unit 350, and the suspension unit 350 is used to lower or lift the trestle 400. When the temporary support mechanism 300 is extended to the set position, the trestle 400 is lowered by using the suspension unit 350, which is convenient and labor-saving to operate.

[0063] It should be understood that the suspension unit 350 is configured as an electric hoist or a winch. The suspension unit 350 has a simple structure, is easy to install, is easy to operate, and has high stability and safety. After the suspension mechanism lowers the trestle 400 to the bottom of the tunnel, the position where the suspension unit 350 is connected to the trestle 400 is disassembled, and the temporary support mechanism 300 is separated from the trestle 400. The temporary support mechanism 300 can be retracted into the vehicle body 100, occupying a small space, which is conducive to the movement of the vehicle body 100 in the tunnel.

[0064] It should be noted that, taking the suspension unit 350 as a winch as an example, the winch is fixed on the slide 310, the winch is provided with a cable, the cable is provided with a hook, a hanging ring can be provided on the pier 400, the hook is connected to the hanging ring, when the winch rotates to untie the entangled cable, the pier 400 descends, and when the pier 400 descends to the set position, it continues to descend to a certain height to relax the cable, which is conducive to separating the hook and the hanging ring.

[0065] In addition, the number of the suspension units 350 may be two, and the two suspension units 350 are arranged at intervals in the length direction of the slide 310 , and can cooperate with both ends of the pier 400 to improve the stability of the lifting pier 400 .

[0066] Please combine Figure 3 Optionally, the trestle 400 includes a load-bearing bridge plate 410 and a support frame 420, the support frame 420 is fixed on the load-bearing bridge plate 410, and the support frame 420 is used to contact the bottom surface of the tunnel; the load-bearing bridge plate 410 and the slide 310 are slidably matched in the vertical direction, and the load-bearing bridge plate 410 and the suspension unit 350 are detachably connected. When the trestle 400 is lowered to the bottom surface of the tunnel by the suspension unit 350, the support frame 420 is supported on the bottom surface of the tunnel, and the load-bearing bridge plate 410 is basically arranged horizontally, which is conducive to the vehicle body 100 walking on the trestle 400.

[0067] It should be understood that the support frame 420 can be configured as a steel structure frame with high structural strength.

[0068] The retractable and overlapping tunnel construction trolley provided in this embodiment has a high degree of mechanization, is flexible and labor-saving to move, and is convenient and fast to transfer; it can also adapt to complex tunnel terrain and has a wide construction range.

[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A retractable and overlapping tunnel construction trolley, characterized in that: include: A vehicle body (100), a lifting platform (200), a temporary support mechanism (300) and a trestle (400); the lifting platform (200) is fixed on the vehicle body (100), and the lifting platform (200) can be raised and lowered relative to the top of the tunnel face (001); the temporary support mechanism (300) is installed on the lifting platform (200), and the temporary support mechanism (300) and the lifting platform (200) can be slidably matched in the horizontal direction so that they can be supported on the bottom surface of the tunnel after extending out of the rear of the vehicle body (100); the trestle (400) and the temporary support mechanism (300) can be raised and lowered, and the trestle (400) can be lowered to the bottom surface of the tunnel after being supported by the temporary support mechanism (300) on the bottom surface of the tunnel; the vehicle body (100) can walk onto the trestle (400) lowered on the bottom surface of the tunnel.

2. The shrinkable and foldable tunnel construction trolley according to claim 1 is characterized in that: The jacking platform (200) comprises a plurality of layers of jacking brackets (210), wherein the plurality of layers of jacking brackets (210) are stacked in sequence, wherein the jacking bracket (210) located at the bottom layer is fixedly connected to the vehicle body (100), and the jacking bracket (210) located at the top of two adjacent jacking brackets (210) can be lifted and matched with the jacking bracket (210) located at the bottom.

3. The shrinkable and superimposed tunnel construction trolley according to claim 2 is characterized in that: The temporary support mechanism (300) is slidably matched with the lifting bracket (210) at the bottom layer in the horizontal direction.

4. The shrinkable and foldable tunnel construction trolley according to claim 3 is characterized in that: The retractable and superimposed tunnel construction trolley further comprises a first gear drive mechanism (500), the first gear drive mechanism (500) comprising a first motor (510), a first driving gear (520) and a first transmission rack (530), the first motor (510) being fixed to the bottom layer of the jacking bracket (210), the first driving gear (520) being fixedly connected to the output shaft of the first motor (510), the first transmission rack (530) being fixedly connected to the temporary support mechanism (300), and the first gear being meshed with the first transmission rack (530).

5. The shrinkable and foldable tunnel construction trolley according to claim 1 is characterized in that: The temporary support mechanism (300) includes a slide (310), a support leg (320) and a diagonal brace (330); the slide (310) is slidably matched with the jacking platform (200) in the horizontal direction; the support leg (320) is rotatably connected to the slide (310); one end of the diagonal brace (330) is rotatably connected to the slide (310), and the other end is unlockably connected to the support leg (320).

6. The shrinkable and overlapping tunnel construction trolley according to claim 5 is characterized in that: The diagonal brace (330) is provided with a fastener (340), and the diagonal brace (330) is unlockably connected to the supporting leg (320) via the fastener (340).

7. The shrinkable and foldable tunnel construction trolley according to claim 5 is characterized in that: The temporary support mechanism (300) further comprises a suspension unit (350), wherein the suspension unit (350) is fixed on the slide frame (310), the trestle (400) is detachably connected to the suspension unit (350), and the suspension unit (350) is used to lower or lift the trestle (400).

8. The shrinkable and foldable tunnel construction trolley according to claim 7 is characterized in that: The suspension unit (350) is configured as an electric hoist or a winch.

9. The shrinkable and foldable tunnel construction trolley according to claim 7, characterized in that: The trestle (400) includes a load-bearing bridge plate (410) and a support frame (420), wherein the support frame (420) is fixed on the load-bearing bridge plate (410), and the support frame (420) is used to contact the bottom surface of the tunnel; the load-bearing bridge plate (410) and the slide frame (310) are slidably matched in the vertical direction, and the load-bearing bridge plate (410) and the suspension unit (350) are detachably connected.

10. The shrinkable and foldable tunnel construction trolley according to claim 2, characterized in that: The lifting bracket (210) comprises a base frame (211), an unfolding frame (212) and a second gear driving mechanism (213); the base frames (211) of adjacent lifting brackets (210) are connected, and the unfolding frame (212) and the base frame (211) are slidably matched in the horizontal direction; the second gear driving mechanism (213) comprises a second motor (2131), a second driving gear (2132) and a second transmission rack (2133); the second motor (2131) is fixed on the base frame (211), the second driving gear (2132) is fixed on the output shaft of the second motor (2131), the second transmission rack (2133) is fixed on the unfolding frame (212), and the second driving gear (2132) is meshed with the second transmission rack (2133).

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