A construction method for dismantling and quickly retreating a rectangular shield machine to a starting shaft

Abstract

The present invention discloses a construction method for dismantling a rectangular shield machine in a station and quickly retreating to a starting well. The method comprises the following steps: (1) transforming the outer shield body and the chest plate of the rectangular shield machine into a detachable segmented connection structure in advance; (2) dismantling the internal components of the rectangular shield machine in sequence, and hoisting them out from the starting well; (3) setting a guide rail and a gantry in the direction of the station, separating the front outer shield body from the middle and outer shield bodies by the gantry in cooperation with a hand chain hoist, and separating the upper and lower sections of the front outer shield body; (4) rotating the upper and lower sections of the front outer shield body by 90° through a turntable, and then dragging and sliding the rotated upper and lower sections of the front outer shield body to an electric rail car in a jacking channel by the gantry in cooperation with a hand chain hoist, and transporting them to the starting well for hoisting; (5) separating the middle and outer shield bodies and the rear outer shield body in sequence, moving them to the starting well, and hoisting them out in the same way. The present invention is suitable for all kinds of underground engineering jacking construction operations where the receiving end cannot realize hoisting operations.

Description

Technical Field

[0001] The invention relates to a construction method for disintegrating and quickly retreating a launching shaft in a rectangular shield machine station, which is mainly used for pipe jacking construction of underground projects where a hoisting operation cannot be achieved at a receiving end, and belongs to the technical field of pipe jacking construction. Background Art

[0002] In the construction of urban rail transit projects, the construction of ancillary structures such as entrances and exits often requires passing under urban roads, various pipelines, etc., and the jacking construction technology is often used. The conventional construction process is that the rectangular shield machine is hoisted into and assembled from the starting shaft. After the jacking excavation is completed, the machine is dismantled and hoisted out from the jacking receiving shaft. However, due to the restrictions and influences of various factors in urban engineering construction, the receiving shaft in the station is often capped prematurely and the shield machine cannot be hoisted out.

[0003] In view of the above situation, traditional construction technology usually has two ways of dealing with it. First, after the jacking is completed, the machine is dismantled inside the station and then moved horizontally, and lifted out from other lifting ports. This method requires a lot of reinforcement measures for the center plate of the station, which is time-consuming and labor-intensive, and overlaps with the construction of other internal structures of the station, resulting in low construction efficiency. Second, when it is impossible to move horizontally to other lifting ports due to obstructions from the internal structure of the station, the shell is abandoned, that is, after the internal structure of the shield machine is dismantled, the outer shield of the shield machine is directly poured into the concrete to become a part of the channel structure. This method causes serious waste of material resources and increases construction costs.

[0004] Therefore, a more advanced rectangular shield machine disassembly and lifting construction method is urgently needed to cope with the jacking construction work where the jacking receiving shaft is capped in advance and the lifting operation cannot be realized. Summary of the invention

[0005] In view of the above-mentioned defects existing in the prior art, the present invention provides a construction method for quickly retreating a rectangular shield machine to a starting shaft within a station, which has the advantages of simple construction, convenient operation, high construction efficiency and little waste of resources.

[0006] The present invention is realized by the following technical scheme: a construction method for disintegrating and quickly retreating a starting shaft of a rectangular shield machine in a station, characterized in that it comprises the following steps:

[0007] (1) The outer shield of the rectangular shield machine is transformed into a three-section structure along its length direction, namely, the front outer shield, the middle outer shield, and the rear outer shield. Each section of the outer shield is divided into two sections, the upper and lower sections. Bolts are used to connect the front outer shield, the middle outer shield, the rear outer shield, and the upper and lower sections of each outer shield. The chest plate of the rectangular shield machine is transformed into a detachable combined structure in advance.

[0008] (2) dismantling the internal components of the rectangular shield machine in sequence, and transporting the dismantled internal components to the starting shaft for hoisting and transporting them out; among them, the breast plate is disassembled and then hoisted and transported out;

[0009] (3) A guide rail and a gantry are provided near the station direction of the front outer shield of the rectangular shield machine. The gantry is movably provided on the guide rail, and the bolt connection between the front outer shield and the middle outer shield is released. A hand chain hoist is provided on the gantry to be connected with the front outer shield. The front outer shield is separated from the middle outer shield by the hand chain hoist, and then the connecting bolts between the upper and lower sections of the separated front outer shield are released. The upper section of the front outer shield is lifted by the gantry in cooperation with the hand chain hoist, so that the upper and lower sections of the front outer shield are separated;

[0010] (4) The upper and lower sections of the separated front outer shield are rotated 90° by a turntable placed under the gantry, and then the gantry cooperates with a hand chain hoist to drag and slide the rotated upper and lower sections of the front outer shield to the electric rail trolley in the top pipe channel at the rear of the rectangular shield machine, and then the electric rail trolley is used to transport them back to the starting shaft for hoisting;

[0011] (5) Using the same method, separate the middle and outer shields and the rear outer shield in turn, move them to the launching well, and hoist them out.

[0012] Since the size of the outer shield of the rectangular shield machine is consistent with that of the top pipe channel, in order to achieve the return to the top pipe channel and reduce the difficulty of later lifting, the present invention transforms the structure of the rectangular shield machine, transforms its outer shield into a detachable three-section structure, and transforms each section into two sections, and transforms the chest plate of the shield machine into a detachable combined structure. A gantry is set at the station position, and the gantry and hand winch are used to separate the segments of the outer shield. After the separated outer shield segments are rotated 90° by the turntable, they are moved to the electric rail car in the top pipe channel, and then retreated to the starting shaft by the electric rail car, and lifted out from the starting shaft. The construction problem that the shield machine cannot be lifted out due to the premature capping of the top pipe receiving shaft is solved.

[0013] Furthermore, in order to reduce the difficulty of lifting, the breast plate is composed of three sections: left, middle and right, and the three sections are connected by bolts.

[0014] Furthermore, in order to facilitate the removal of the internal components of the shield machine, in step (2), when removing the internal components of the rectangular shield machine, a lifting point is set on the outer shield body of the rectangular shield machine, and a hand winch is used to remove the cutter head, articulated pump station, internal power control cabinet, screw conveyor, cutter head motor, reducer, cutter head drive, and main machine chest plate in turn.

[0015] Furthermore, the turntable comprises a base, an upper tray, and a plurality of round balls arranged between the base and the upper tray. The turntable can be easily rotated with a load by applying a circumferential oblique pulling force.

[0016] Furthermore, when the outer shield segment rotated 90° is dragged and slid to the electric rail cart in the jacking channel by the gantry in cooperation with the hand winch, two rows of lifting points are preset in advance at the inner upper part of the middle and outer shields, the inner upper part of the rear outer shield, and the inner upper part of the first and second segments of the jacking channel at the rear of the rectangular shield machine to form lifting points for the transport channel. First, a hand winch is used to lift the outer shield segment to be moved through the two outermost lifting points of the transport channel and the lifting points of the gantry, so that its height is higher than the electric rail cart. At this time, the initial state of the hand winches at the two outermost lifting points of the transport channel is oblique, and the gantry is moved to move the lifted outer shield segment toward the transport channel to the outermost part of the transport channel. After the hand chain hoist at the lifting point is in a vertical state, it stops moving. Then, a hand chain hoist is set at the adjacent inner lifting point in the transport channel to connect with the lifted outer shield segment, and the connection between the outer lifting point of the transport channel and the outer shield segment is released. The gantry continues to be moved to make the lifted outer shield segment continue to move toward the transport channel. When the hand chain hoist for lifting the outer shield segment is in a vertical state, the lifting point of the hand chain hoist connected to the outer shield segment is replaced with the next inner lifting point in the transport channel to make the lifted outer shield segment continuously move toward the jacking channel. This process is repeated until the lifted outer shield segment is located directly above the electric rail cart in the jacking channel and then it is placed on the electric rail cart.

[0017] The beneficial effects of the present invention are as follows: the present invention abandons the traditional construction ideas, proposes a construction idea of ​​hoisting a rectangular shield machine from a starting shaft, and advances the transformation of the outer shield body and the chest plate of the rectangular shield machine, sets a gantry at the station position, uses the gantry and hand chain hoist to disassemble and separate the outer shield body of the rectangular shield machine and separate it up and down, uses a turntable to realize the rotation of the outer shield body segment of the shield machine, and uses the gantry to cooperate with the hand chain hoist to drag and slide the outer shield body segment to the electric rail plate car in the top pipe channel and return to the starting shaft for hoisting. The construction method of the present invention solves the construction problem that the rectangular shield machine cannot be hoisted out in the busy traffic area of ​​the city due to the early sealing of the top of the top pipe construction receiving shaft to restore the road, reduces the impact of urban road traffic on subway construction, avoids the shield machine shell abandonment, eliminates resource waste, and reduces construction costs. The method of the present invention has simple process, convenient operation, reduces construction difficulty, improves construction efficiency, is suitable for various underground engineering top pipe construction operations where the receiving end cannot realize hoisting operations, and has good application value and wide promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process flow in a specific embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the main view of the outer shield body after the transformation in the present invention;

[0020] Figure 3is a top view schematic diagram of the outer shield body after the transformation in the present invention;

[0021] Figure 4 is a schematic diagram of the back side of the modified chest plate of the present invention;

[0022] Figure 5 is a schematic top view of the turntable in the present invention;

[0023] Figure 6 yes Figure 5 AA cross-sectional view in FIG.

[0024] Figure 7 Schematic diagram of the upper section rotation process of the front outer shield in a specific embodiment of the present invention;

[0025] Figure 8 It is a schematic diagram of the replacement of the lifting point when the outer shield segment is lifted in a specific embodiment of the present invention;

[0026] In the figure, 1, front outer shield, 2, middle outer shield, 3, rear outer shield, 4, gantry, 5, guide rail, 6, turntable, 7, upper and lower connecting bolts, 8, front and rear connecting bolts, 9, first segment, 10, second segment;

[0027] 1.1, upper section of front outer shield, 1.2, lower section of front outer shield;

[0028] 6.1. Base, 6.2. Round ball, 6.3. Upper tray. DETAILED DESCRIPTION

[0029] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0030] A construction method for a rectangular shield machine to disintegrate quickly and retreat to the starting shaft in the station, and the construction process is as follows: Figure 1 shown.

[0031] The specific construction steps are as follows:

[0032] (1) Preparation before construction: Modify the rectangular shield machine in advance, reasonably plan the weight of the individual components, and reduce the difficulty of lifting construction. Figure 2-Figure 3 As shown in the figure, the outer shield of the rectangular shield machine is transformed into a three-section structure of a front outer shield 1, a middle outer shield 2, and a rear outer shield 3 along its length direction. Each outer shield section is divided into an upper section and a lower section. For example, the front outer shield 1 is divided into an upper section 1.1 of the front outer shield and a lower section 1.2 of the front outer shield. The front outer shield 1, the middle outer shield 2, and the rear outer shield 3 are all connected by bolts, that is, the front and rear connecting bolts 8 shown in the figure. The upper and lower sections of each outer shield are also connected by bolts, that is, the upper and lower connecting bolts 7 shown in the figure. As shown in the figure Figure 4As shown, the chest plate of the rectangular shield machine is transformed into a detachable combined structure. In this embodiment, the chest plate is transformed into a combination of three sections: left, middle and right. The three sections of the chest plate are connected by flanges and bolts.

[0033] (2) After the demolition of the ground-connected wall and the temporary sealing of the tunnel gate are completed, the internal components of the rectangular shield machine, such as the cutterhead, articulated pump station, internal power control cabinet, screw conveyor, cutterhead motor, reducer, cutterhead drive, and main engine breast plate, are removed in sequence by setting a lifting point on the outer shield of the rectangular shield machine using a hand chain hoist, and the removed internal components are transported to the starting shaft and hoisted out; when hoisting the breast plate, the connecting bolts between the three breast plates are first removed, and then the three breast plates are hoisted out separately;

[0034] (3) As attached Figure 7 As shown, a guide rail 5 and a gantry 4 are provided at the station direction near the front outer shield 1 of the rectangular shield machine. The gantry 4 is movably provided on the guide rail 5, and the center line of the gantry 4 should be consistent with the center line of the shield machine. The bolt connection between the front outer shield 1 and the middle outer shield 2 is released, and a hand chain hoist is provided on the gantry 4 to connect with the front outer shield 1. The front outer shield 1 is separated from the middle outer shield 2 by the hand chain hoist, and then the connecting bolts between the front outer shield upper section 1.1 and the front outer shield lower section 1.2 of the separated front outer shield 1 are released, and then the front outer shield upper section 1.1 is lifted by the gantry 4 in cooperation with the hand chain hoist, so that the front outer shield upper section 1.1 and the front outer shield lower section 1.2 are separated;

[0035] (4) As attached Figure 7 As shown, the separated upper section 1.1 of the front outer shield is placed on the turntable 6 below the gantry 4, and after rotating it 90° through the turntable 6, the gantry 4 cooperates with the hand winch to drag and slide the rotated upper section 1.1 of the front outer shield to the electric rail trolley in the top pipe channel at the rear of the rectangular shield machine, and the electric rail trolley is used to transport it back to the starting shaft for lifting out; according to the same method as above, the lower section 1.2 of the front outer shield is placed on the turntable 6, and after rotating it 90° through the turntable 6, the gantry 4 cooperates with the hand winch to drag and slide the rotated lower section 1.2 of the front outer shield to the electric rail trolley in the top pipe channel at the rear of the rectangular shield machine, and the electric rail trolley is used to transport it back to the starting shaft for lifting out. As shown in the attached figure Figure 5-Figure 6 As shown, the turntable 6 used in this embodiment includes a base 6.1, an upper tray 6.3, and a plurality of round balls 6.2 arranged between the base 6.1 and the upper tray 6.3. The outer shield body segment is placed on the upper tray 6.3, and can be easily rotated with load by applying circumferential oblique pulling force.

[0036] (5) Separate the middle and outer shields and the rear outer shield in turn, move them to the launching well, and hoist them out using the same method as above.

[0037] In the present invention, when the outer shield segment rotated 90° is dragged and slid to the track vehicle by the gantry and the hand chain hoist, the specific method adopted is:

[0038] Take the upper section 1.1 of the mobile front outer shield as an example. Figure 8 As shown:

[0039] Two rows of lifting points are preset in advance at the inner upper part of the middle and outer shield bodies 2, the inner upper part of the rear outer shield body 3, and the inner upper part of the first pipe segment 9 and the inner upper part of the second pipe segment 10 of the top pipe channel at the rear of the rectangular shield machine, forming lifting points for the transportation channel. First, a hand chain hoist is used to lift the upper section 1.1 of the front outer shield body to be moved through the two outermost lifting points (d1, d2) of the transportation channel and the gantry lifting points, so that its height is higher than the electric rail car, wherein the gantry lifting point is connected to the front of the upper section 1.1 of the front outer shield body, and the two outermost lifting points (d1, d2) of the transportation channel are connected to the rear of the upper section 1.1 of the front outer shield body. At this time, the initial state of the hand chain hoist at the two outermost lifting points (d1, d2) of the transportation channel is oblique, and the gantry 4 is moved to move the upper section 1.1 of the front outer shield body toward the transportation channel. , stop moving after the hand chain hoist at the outermost lifting point (d1, d2) of the transport channel is in a vertical state, then set a hand chain hoist at the adjacent inner lifting point (d3, d4) in the transport channel to connect with the rear part of the front outer shield upper section 1.1, and release the connection between the outer lifting point (d1, d2) of the transport channel and the front outer shield upper section 1.1, continue to move the gantry 4 to make the front outer shield upper section 1.1 continue to move toward the transport channel, and when the hand chain hoist for lifting the front outer shield upper section 1.1 is in a vertical state, connect The gantry lifting points of the front outer shield upper section 1.1 are replaced with the lifting points (d1, d2) in the transport channel. At this time, the front outer shield upper section 1.1 is suspended through the lifting points (d1, d2) and the lifting points (d3, d4). Then, a hand chain hoist is set at the lifting points (d5, d6) in the transport channel to connect with the rear part of the front outer shield upper section 1.1, and the connection between the lifting points (d3, d4) and the front outer shield upper section 1.1 is released. The front outer shield upper section 1.1 is dragged to the jacking channel by the hand chain hoist, and the hand chain hoist at the lifting points (d5, d6) is set. After being in the vertical state, a hand winch is set at the lifting point (d3, d4) to connect with the front part of the front outer shield upper section 1.1, and the connection between the lifting point (d1, d2) and the front outer shield upper section 1.1 is released. At this time, the front outer shield upper section 1.1 is suspended by the lifting points (d3, d4) and the lifting points (d5, d6). The lifting points are moved repeatedly until the lifted front outer shield upper section 1.1 is located directly above the electric rail trolley in the top pipe channel, and then it is placed on the electric rail trolley, and then transported back to the starting well by the electric rail trolley for lifting.

[0040] The lower section 1.2 of the front outer shield is also moved and lifted according to the above method.

[0041] Each segment of the middle outer shield 2 and the rear outer shield 3 is also moved and hoisted according to the above method. When the upper and lower segments of the middle outer shield 2 are moved, they are moved with the help of the gantry hanging points and the preset hanging points on the rear outer shield 3, the first segment 9, and the second segment 10; when the upper and lower segments of the rear outer shield 3 are moved, they are moved with the help of the gantry hanging points and the preset hanging points on the first segment 9 and the second segment 10.

[0042] The electric track trolley in the present invention is an original device in the jacking channel during the jacking construction, and can be moved to the starting well along the track in the jacking channel.

[0043] The other parts of this embodiment are all prior art and will not be described in detail here.

Claims

1. A construction method for a rectangular shield machine to disintegrate quickly and retreat to a starting shaft in a station, characterized by: The steps include: (1) The outer shield of the rectangular shield machine is transformed into a three-section structure along its length direction, namely, the front outer shield, the middle outer shield, and the rear outer shield. Each section of the outer shield is divided into two sections, the upper and lower sections. Bolts are used to connect the front outer shield, the middle outer shield, the rear outer shield, and the upper and lower sections of each outer shield. The chest plate of the rectangular shield machine is transformed into a detachable combined structure in advance. (2) dismantling the internal components of the rectangular shield machine in sequence, and transporting the dismantled internal components to the starting shaft for hoisting and transporting them out; among them, the breast plate is disassembled and then hoisted and transported out; (3) A guide rail and a gantry are provided near the station direction of the front outer shield of the rectangular shield machine. The gantry is movably provided on the guide rail, and the bolt connection between the front outer shield and the middle outer shield is released. A hand chain hoist is provided on the gantry to be connected with the front outer shield. The front outer shield is separated from the middle outer shield by the hand chain hoist, and then the connecting bolts between the upper and lower sections of the separated front outer shield are released. The upper section of the front outer shield is lifted by the gantry in cooperation with the hand chain hoist, so that the upper and lower sections of the front outer shield are separated; (4) The upper and lower sections of the separated front outer shield are rotated 90° by a turntable placed under the gantry, and then the gantry cooperates with a hand chain hoist to drag and slide the rotated upper and lower sections of the front outer shield to the electric rail trolley in the top pipe channel at the rear of the rectangular shield machine, and then the electric rail trolley is used to transport them back to the starting shaft for hoisting; (5) Using the same method, separate the middle and outer shields and the rear outer shield in turn, move them to the launching well, and hoist them out.

2. The construction method for the rectangular shield machine to disintegrate quickly and retreat to the starting shaft in the station according to claim 1 is characterized by: The breast plate is composed of three sections: left, middle and right, and the three sections are connected by bolts.

3. The construction method for the rectangular shield machine to disintegrate quickly and retreat to the starting shaft in the station according to claim 1 is characterized by: In step (2), when dismantling the internal components of the rectangular shield machine, a lifting point is set on the outer shield body of the rectangular shield machine, and a hand winch is used to dismantle the cutter head, articulated pump station, internal power control cabinet, screw conveyor, cutter head motor, reducer, cutter head drive, and main machine chest plate in sequence.

4. The construction method for the rectangular shield machine to disintegrate quickly and retreat to the starting shaft in the station according to claim 1 is characterized by: The turntable comprises a base, an upper tray, and a plurality of round balls arranged between the base and the upper tray.

5. The construction method for the rectangular shield machine to disintegrate and quickly retreat to the starting shaft in the station according to claim 1, 2, 3 or 4, characterized in that: When the outer shield segment rotated 90° is dragged and slid to the electric rail cart in the jacking channel by the gantry and the hand winch, two rows of lifting points are preset in advance at the inner upper part of the middle and outer shields, the inner upper part of the rear outer shield, and the inner upper part of the first and second segments of the jacking channel at the rear of the rectangular shield machine to form the lifting points of the transportation channel. First, the hand winch is used to lift the outer shield segment to be moved through the two outermost lifting points of the transportation channel and the gantry lifting points, so that its height is higher than the electric rail cart. At this time, the initial state of the hand winches at the two outermost lifting points of the transportation channel is oblique. The gantry is moved to move the lifted outer shield segment toward the transportation channel to the outermost lifting points of the transportation channel. After the hand chain hoist at the position is in a vertical state, it stops moving. Then, a hand chain hoist is set at the adjacent inner lifting point in the transport channel to connect with the lifted outer shield segment, and the connection between the outer lifting point of the transport channel and the outer shield segment is released. The gantry continues to be moved to make the lifted outer shield segment continue to move toward the transport channel. When the hand chain hoist for lifting the outer shield segment is in a vertical state, the lifting point of the hand chain hoist connected to the outer shield segment is replaced with the next inner lifting point in the transport channel to make the lifted outer shield segment continuously move toward the jacking channel. This process is repeated until the lifted outer shield segment is located directly above the electric rail cart in the jacking channel and then it is placed on the electric rail cart.

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