Combined pipe roof equipment capable of integrally retreating and construction method

Abstract

The invention belongs to the technical field of tunnel engineering, and particularly provides overall retreating combined pipe curtain equipment which comprises a shield body mechanism, a combined pipe curtain and a retreating mechanism. The shield body mechanism comprises an outer shield body and an inner shield body; the outer shield body movably sleeves the periphery of the inner shield body; the combined pipe roofing is connected with the inner shield body; the rollback mechanism comprises a first driving piece and a connecting piece, the connecting piece is fixedly arranged on the inner shield body, the first driving piece is fixedly arranged outside a construction pipeline prearranged in the tunnel, the driving end of the first driving piece is connected with the connecting piece, and the first driving piece is used for integrally rollback the inner shield body and the combined pipe curtain arranged in the inner shield body. The outer shield body and the inner shield body are connected in a mechanical coupling mode, the inner shield body and the combined pipe roofing arranged in the inner shield body are made to return to the initial position through the return mechanism after construction is completed, the pipe roofing construction advancing frequency is reduced, and the overall construction quality and speed of the pipe roofing method are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering and relates to an integrally retractable combined pipe curtain device and a construction method. Background Art

[0002] The pipe curtain method involves creating a horizontal curtain of construction in the ground. It typically relies on a small-diameter pipe jacking machine to jack a single pipe. The pipes are then connected by interlocking joints to form a closed or semi-closed curtain. Trenchless construction is then achieved within the curtain enclosure. Pipe curtain construction can effectively support shallow, large-section tunnels, and complex geological conditions. It is the safest and most effective method for excavating large-diameter, short-distance, shallow-depth tunnels. It offers advantages such as no road reconstruction, no disruption to surface traffic, no pipeline rerouting, no groundwater extraction, and no need to reinforce building foundations or pile foundations. With the rapid construction of highways, subways, intercity railways, and high-speed railways, the number of intersecting transportation facilities has increased. Crossing highways and high-speed railways, in particular, imposes extremely stringent settlement control standards. In recent years, pipe curtain technology has seen increasing application, creating a significant market opportunity. However, the efficiency of pipe curtain construction is hampered by the heavy workload of cutting, connecting, and welding the pipe curtains, the inconvenience of returning the pipe curtain machine to its starting position, and long construction periods.

[0003] The combined pipe curtain technology is developed based on the single-tube pipe curtain method. It can combine multiple small-section pipe jacking machines into a pipe curtain structure, which greatly improves construction. It can be customized according to different geological conditions and construction requirements, effectively overcoming the problem of heavy workload of steel pipe cutting and welding in the single-tube pipe curtain method. However, the problem of the inconvenience of the pipe curtain machine returning to the starting position remains to be solved. Summary of the Invention

[0004] The present invention aims to provide an integral retractable combined pipe curtain device and construction method that can solve the problems of inconvenient transportation and high time cost in the process of returning the combined pipe curtain machine to the starting position after excavation is completed in the prior art.

[0005] The present invention provides an integral retractable combined pipe curtain device, comprising a shield mechanism, a combined pipe curtain and a retracting mechanism; The shield mechanism comprises an outer shield and an inner shield; the outer shield is movably sleeved on the periphery of the inner shield; The combined tube curtain is connected to the inner shield, and the combined tube curtain is configured as a structure composed of two or more cylindrical tubes arranged side by side in a horizontal direction or a vertical direction; The retraction mechanism includes a first driving member and a connecting member, wherein the connecting member is fixedly arranged on the inner shield body, the first driving member is fixedly arranged outside the construction pipe preset in the tunnel, and the driving end of the first driving member is connected to the connecting member, and is used to retract the inner shield body and the combined pipe curtain arranged in the inner shield body as a whole.

[0006] Furthermore, the outer shield body and the inner shield body are connected by mechanical coupling, and the inner shield body slides inside the outer shield body along the axis direction of the outer shield body.

[0007] Furthermore, the inner shield includes an inner shell and a shield connection mechanism; The shield connecting mechanism is connected to the inner shell and the outer shield at the same time; When the pipe curtain is being constructed, the shield connection mechanism extends outward, and the outer shield is fixedly connected to the inner shield; When the whole machine retracts, the shield connecting mechanism retracts inward, and the outer shield is separated from the inner shield, so that the whole machine can retract.

[0008] Furthermore, the connecting members are provided in at least two groups symmetrically arranged along the axis of the inner shield body, and a single group of connecting members is provided with at least one; The first driving member is configured as a winch.

[0009] Furthermore, in addition to the above structure, the present invention provides an integrally retractable combined pipe-roof device, further comprising a tunneling cutterhead and a pipe-roof main drive; The pipe curtain main drive is provided with multiple pieces arranged in a one-to-one correspondence with two or more cylindrical pipe bodies. The single-piece pipe curtain main drive is arranged inside the single-piece cylindrical pipe body and connected to the excavation cutter head to provide excavation power to the excavation cutter head.

[0010] Furthermore, the excavation cutterhead is configured as a folding cutterhead structure, and the excavation cutterhead includes a fixing portion, a connecting assembly and a folding portion; The connecting component is arranged between the fixed portion and the folding portion, and the connecting component is connected to the fixed portion and the folding portion at the same time, and the fixed portion, the connecting component and the folding portion are connected to each other to form a variable diameter cutter head structure; The middle part of the fixed part is connected to the main drive of the pipe curtain, so that the fixed part is driven by the main drive of the pipe curtain to perform excavation.

[0011] Furthermore, the connecting assembly includes a rotating shaft for connecting the fixing portion and the folding portion and a second driving member for driving the rotating shaft to rotate; The fixed end of the second driving member is fixedly connected to the fixing portion, and the driving end of the second driving member is fixedly connected to the rotating shaft.

[0012] Furthermore, in addition to the above structure, the overall retractable combined pipe curtain device provided by the present invention also includes a slag discharge pipeline; The slag discharge pipeline is arranged inside the inner shield body, and the slag discharge pipeline is communicated with the excavation cutter head, and is used to discharge the rock slag generated by the excavation cutter head during the excavation process.

[0013] As a further embodiment of the present invention, the present invention also provides a method for carrying out construction using the above-mentioned integrally retractable combined pipe curtain device, comprising the following steps: Step 1: Excavation and jacking; The main drive of the pipe curtain starts, driving the cutting disc to excavate the section; The combined tube curtain moves synchronously; Step 2: Reduce the diameter of the cutter head; When the excavation of the combined pipe curtain is completed, the connecting assembly on the tunneling cutterhead rotates toward the cross-section through the folding portion, so that the end face projection diameter of the tunneling cutterhead shrinks to below the inner diameter of the inner shield; Step 3: Separate the shield body; The shield connection mechanism retracts toward the center of the shield mechanism and retracts to the outer periphery of the inner shield. At this time, the inner shield and the outer shield are mechanically decoupled, and the combined pipe curtain machine main unit and the inner shield used for constructing the combined pipe curtain slide inside the outer shield. Step 4: Roll back the entire machine; Start the winch in the retraction mechanism and pull the cable between the winch and the connector provided on the inner shield to quickly retract the combined pipe curtain along the inner wall of the construction pipeline to the starting position; Step 5: Update location; The combined pipe curtain is reassembled with the newly prefabricated outer shield in the starting shaft, the diameter of the excavation cutterhead is restored to its original size, and the starting position of the combined pipe curtain is adjusted to facilitate the excavation and jacking of the next set of pipe curtain channels.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides an integral retractable combined pipe curtain device, which connects the outer shield body and the inner shield body by mechanical coupling, and enables the inner shield body and the combined pipe curtain arranged in the inner shield body to retract to the initial position through a retracting mechanism after the construction is completed, thereby reducing the number of times the pipe curtain construction is advanced, and greatly improving the overall construction quality and speed of the pipe curtain method.

[0015] (2) In the present invention, the excavation cutter disc is set as a folding cutter disc structure, and the folding cutter disc, the inner and outer shield bodies and the retraction mechanism are coordinated to make the cutter disc and the inner shield body have the conditions for retraction, thereby realizing the rapid retraction of the combined pipe curtain machine as a whole, thereby improving the excavation efficiency and construction progress.

[0016] (3) The present invention provides a construction method for an integrally retractable combined pipe curtain device. By assembling the combined pipe curtains accordingly, after the combined pipe curtain tunnel is formed, all the cutter heads are folded and reduced in diameter, and the retraction mechanism is used to quickly return to the starting position, and the next pipe curtain construction is performed again, thereby improving the excavation efficiency and construction progress.

[0017] (4) The present invention provides a construction method for an integrally retractable combined pipe curtain equipment. By configuring a foldable cutter disc, the diameter of the cutter disc after folding is smaller than the diameter of the pipe section, thereby realizing the retractable function of the cutter disc; by configuring an outer shield body and an inner shield body, when the whole machine is retracted, the inner shield body and the outer shield body are separated, thereby realizing the retractable function of the whole machine; a retracting device is configured to realize the rapid retraction of the combined pipe curtain machine; the force of the combined pipe curtain machine can be adjusted by the steering and rotation speed of the left and right side cutter discs, thereby realizing stable support of the combined pipe curtain machine and improving the accuracy and quality of tunnel construction.

[0018] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic structural diagram of an integrally retractable combined pipe curtain device according to an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the folding cutter disc; Figure 3 yes Figure 2 A partial side view of the connection between the middle connecting assembly and the folding portion; Figure 4 yes Figure 1 Schematic diagram of the structure of the middle shield mechanism.

[0020] in: 1. Folding cutterhead, 11. Fixing part, 12. Folding part, 13. Connecting assembly, 2. Main drive of pipe curtain, 3. Outer shield, 4. Inner shield, 41. Inner shell, 42. Shield connecting mechanism, 421. Base, 422. Telescopic cylinder, 423 Connecting parts, 5. Slag discharge pipeline, 6. Lifting lug, 7. Construction pipeline, 8. Winch. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more clear and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the drawings of the present application are all simplified and use non-accurate proportions, and are only used to facilitate and clearly assist in describing the implementation of the present application; the number of several mentioned in the present application is not limited to the specific number in the example of the drawings; the directions or position relationships mentioned in the present application, such as 'front','middle','rear', 'left', 'right', 'top', 'bottom', 'top', 'bottom','middle', are all based on the directions or position relationships shown in the drawings of the present application, and do not indicate or imply that the devices or parts referred to must have a specific direction, nor can it be understood as a limitation on the present application.

[0022] Embodiment 1 Referring to Figures 1 to 4 As shown in the drawings, the whole back-off combined pipe curtain equipment provided by the present application comprises a combined pipe curtain, a pipe curtain main drive 2, a back-off mechanism, a folding cutter head 1 and a shield body mechanism; The combined pipe curtain is arranged in a structure in which two or more cylindrical pipe bodies are arranged side by side in a horizontal direction or a vertical direction; The pipe curtain main drive 2 is provided with a plurality of parts corresponding to the two or more cylindrical pipe bodies, and a single pipe curtain main drive 2 is arranged inside a single cylindrical pipe body to provide excavation power for the folding cutter head 1; The folding cutter head 1 comprises a fixed part 11, a connecting assembly 13 and a folding part 12; the connecting assembly 13 is arranged between the fixed part 11 and the folding part 12, and the connecting assembly 13 is connected to the fixed part 11 and the folding part 12 at the same time, and the fixed part 11, the connecting assembly 13 and the folding part 12 are connected to each other to form a variable-diameter cutter head structure; the middle part of the fixed part 11 is connected to the pipe curtain main drive 2, so as to drive the fixed part 11 to excavate through the pipe curtain main drive 2; The back-off mechanism is arranged behind the folding cutter head 1, and the back-off mechanism comprises a lifting lug 6 and a winch 8; the lifting lug 6 is provided with a plurality of parts arranged on the inner shield body 4, and the plurality of lifting lugs 6 are preferably arranged symmetrically; the winch 8 is arranged outside the construction pipe 7, and is connected to the lifting lug 6 through a cable, and is used to provide power for the back-off of the combined pipe curtain after construction; The shield mechanism includes an outer shield 3 and an inner shield 4; the outer shield 3 and the inner shield 4 are mechanically coupled to each other, and the inner shield 4 can slide along its axial direction within the outer shield 3. Specifically, in this embodiment, the outer shield 3 is sleeved on the inner shield 4; the inner shield 4 includes an inner shell 41 and a shield connection mechanism 42, and the shield connection mechanism 42 preferably includes multiple groups, each of which is fixedly mounted on the inner shell 41. When the pipe curtain is being constructed, the shield connection mechanism 42 extends outward, and the outer shield 3 is fixedly connected to the inner shield 4; when the entire machine is retracted, the shield connection mechanism 42 retracts inward, and the outer shield 3 is separated from the inner shield 4, realizing the retractable function of the entire machine.

[0023] Preferably, in this embodiment, the combined pipe curtain is configured to be composed of three cylindrical pipe bodies arranged parallel to each other in the horizontal direction. The middle pipe body should be excavated and constructed first, followed by the pipe bodies on both sides, and the axial staggered excavation is realized to realize the combined section excavation.

[0024] Preferably, the connecting assembly 13 includes a rotating shaft for connecting the fixing portion 11 and the folding portion 12 and a second driving member for driving the rotating shaft to rotate; The fixed end of the second driving member is fixedly connected to the fixing portion 11 , and the driving end of the second driving member is fixedly connected to the rotating shaft.

[0025] Further preferably, in this embodiment, the second driving member is preferably configured as a pushing cylinder or a rotating cylinder with a stroke, a rotating motor, etc., so as to limit its rotation range or pushing range through its own stroke switch on the basis of providing power when the folding part 12 is folded or unfolded relative to the fixed part 11.

[0026] Preferably, the shield connecting mechanism 42 includes a base 421, a telescopic cylinder 422 and a connecting piece 423; The base 421 is fixed to the inside of the inner shell 41; the telescopic cylinder 422 is placed on the base 421 to achieve the movement of extending from the inside to the outside and retracting from the outside to the inside; The connecting piece 423 is fixed on the piston of the telescopic oil cylinder 422. The telescopic oil cylinder 422 extends to push the connecting piece 423 into the through hole of the outer shield 3, thereby achieving a fixed connection between the inner and outer shields. The telescopic oil cylinder 422 retracts and pulls the connecting piece 423 back to the inner shield body 4 , thereby realizing relative separation between the inner shield body 4 and the outer shield body 3 .

[0027] As a further embodiment of the present invention, in addition to the above structure, the present invention provides an integrally retractable combined pipe curtain device, further comprising a slag discharge pipeline 5; The slag discharge pipeline 5 is arranged inside the inner shield body 4, and the slag discharge pipeline 5 is communicated with the folding cutter head 1, and is used to discharge the rock slag generated by the excavation cutter head during the excavation process.

[0028] Example 2: The present invention also provides a construction method for an integrally retractable combined pipe curtain device, which specifically comprises the following steps: Step 1: Excavation and jacking; The main drive of the pipe curtain is started, driving the folding cutter head to perform cross-section excavation. The propulsion device in the pipe curtain machine simultaneously pushes the combined pipe curtain to move, so as to realize the excavation and jacking of the combined pipe curtain, thereby greatly improving the overall construction efficiency of the pipe curtain method.

[0029] Step 2: Reduce the diameter of the cutter head; When the excavation of the combined pipe curtain is completed, the connecting assembly on the folding cutterhead rotates toward the cross-section through the folding portion, so that the end face projection diameter of the folding cutterhead shrinks to below the inner diameter of the inner shield, thereby ensuring that a safe distance is maintained between the folding cutterhead and the shield mechanism during subsequent retraction operations.

[0030] Step 3: Separate the shield body; The shield connection mechanism shrinks toward the center of the shield mechanism and shrinks to the outer peripheral position of the inner shield. At this time, mechanical decoupling is achieved between the inner shield and the outer shield. The combined pipe curtain machine main unit and the inner shield used for constructing the combined pipe curtain slide inside the outer shield, making the overall retraction of the combined pipe curtain machine main unit feasible.

[0031] Step 4: Roll back the entire machine; Start the winch in the retraction mechanism and pull the cable between the winch and the connector provided on the inner shield to quickly retract the combined pipe curtain along the inner wall of the construction pipeline to the starting position.

[0032] Step 5: Update location; The combined pipe curtain machine is reassembled with the newly prefabricated outer shield in the starting well, the diameter of the folding cutter disc is restored to its original size, the starting position of the combined pipe curtain machine is adjusted, and the excavation and jacking of the next group of pipe curtain channels are carried out.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An integrally retractable combined pipe curtain device, characterized in that: It includes a shield mechanism, a combined pipe curtain and a retraction mechanism; The shield mechanism comprises an outer shield (3) and an inner shield (4); the outer shield (3) is movably sleeved on the periphery of the inner shield (4); The combined tube curtain is connected to the inner shield body (4), and the combined tube curtain is configured as a structure formed by two or more cylindrical tube bodies arranged in parallel in a horizontal direction or a vertical direction; The retraction mechanism comprises a first driving member and a connecting member, wherein the connecting member is fixedly arranged on the inner shield body (4), the first driving member is fixedly arranged outside a construction pipe (7) preset in the tunnel, and the driving end of the first driving member is connected to the connecting member, and is used to retract the inner shield body (4) and the combined pipe curtain arranged in the inner shield body (4) as a whole.

2. The integrally retractable combined tube curtain device according to claim 1, characterized in that: The outer shield body (3) and the inner shield body (4) are connected by mechanical coupling, and the inner shield body (4) slides inside the outer shield body (3) along the axial direction of the outer shield body (3).

3. The integrally retractable combined pipe curtain device according to claim 1, characterized in that: The inner shield (4) comprises an inner shell (41) and a shield connecting mechanism (42); The shield connecting mechanism (42) is connected to both the inner shell (41) and the outer shield (3); When the pipe curtain is being constructed, the shield connecting mechanism (42) extends outward, and the outer shield (3) is fixedly connected to the inner shield (4); When the entire machine retracts, the shield connecting mechanism (42) retracts inward, and the outer shield (3) and the inner shield (4) are separated, thereby enabling the entire machine to retract.

4. The integrally retractable combined tube curtain device according to claim 1, characterized in that: The connecting pieces are provided in at least two groups symmetrically arranged along the axis of the inner shield body (4), and a single group of connecting pieces is provided with at least one; The first driving member is configured as a winch (8).

5. The integrally retractable combined pipe curtain device according to any one of claims 1 to 4, characterized in that: Also includes the main drive for the cutting head and the pipe curtain (2); The pipe curtain main drive (2) is provided with multiple pieces arranged in a one-to-one correspondence with two or more cylindrical pipe bodies. A single pipe curtain main drive (2) is arranged inside the single cylindrical pipe body and connected to the excavation cutter head, and is used to provide excavation power to the excavation cutter head.

6. The integrally retractable combined pipe curtain device according to claim 5, characterized in that: The excavation cutterhead is configured as a folding cutterhead structure, and the excavation cutterhead comprises a fixing portion (11), a connecting assembly (13), and a folding portion (12); The connecting component (13) is arranged between the fixed portion (11) and the folding portion (12), and the connecting component (13) is connected to both the fixed portion (11) and the folding portion (12). The fixed portion (11), the connecting component (13) and the folding portion (12) are connected to each other to form a variable diameter cutter head structure. The middle portion of the fixed portion (11) is connected to the pipe curtain main drive (2), so that the fixed portion (11) is driven by the pipe curtain main drive (2) to perform excavation.

7. The integrally retractable combined pipe curtain device according to claim 6, characterized in that: The connecting assembly (13) comprises a rotating shaft for connecting the fixing portion (11) and the folding portion (12), and a second driving member for driving the rotating shaft to rotate; The fixed end of the second driving member is fixedly connected to the fixed portion (11), and the driving end of the second driving member is fixedly connected to the rotating shaft.

8. The integrally retractable combined pipe curtain device according to claim 6 or 7, characterized in that: It also includes a slag discharge pipeline (5); The slag discharge pipeline (5) is arranged inside the inner shield body (4), and the slag discharge pipeline (5) is interconnected with the excavation cutter head, and is used to discharge the rock slag generated by the excavation cutter head during the excavation process.

9. A method for carrying out construction using the integrally retractable combined pipe curtain device according to claim 8, characterized in that: The following steps are involved: Step 1: Excavation and jacking; The main drive (2) of the pipe curtain is started to drive the cutting disc to excavate the section; The combined tube curtain moves synchronously; Step 2: Reduce the diameter of the cutter head; When the excavation of the combined pipe curtain is completed, the connecting assembly on the excavation cutter head is rotated in the cross-section direction through the folding portion, so that the end face projection diameter of the excavation cutter head is shrunk to below the inner diameter of the inner shield body (4); Step 3: Separate the shield body; The shield connecting mechanism shrinks toward the center of the shield mechanism and shrinks to the outer peripheral position of the inner shield (4), at which time the inner shield (4) and the outer shield (3) are mechanically decoupled, and the combined pipe curtain machine main unit and the inner shield (4) for constructing the combined pipe curtain slide inside the outer shield (3); Step 4: Roll back the entire machine; Starting the winch (8) in the retraction mechanism, pulling the cable between the winch (8) and the connector provided on the inner shield (4), so as to quickly retract the combined pipe curtain along the inner wall of the construction pipeline (7) to the starting position; Step 5: Update location; The combined pipe curtain is reassembled with the newly prefabricated outer shield (3) in the starting well, the diameter of the excavation cutterhead is restored to its initial size, and the starting position of the combined pipe curtain is adjusted to facilitate excavation and jacking of the next set of pipe curtain channels.

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