A method for disassembling and translating a shield under a narrow space and for shell construction of a shield tail

Abstract

The application discloses a construction method for shield disassembly translation and shield tail shell removal in a narrow space, which effectively plans the space of an existing line station before construction and designs the mechanical tooling of the construction method; the shield bracket is reinforced and assembled with the moving slide rail; the vertical jack reliably jacks up the shield machine through the design of the support and the support platform; the shield tail shell removal of the shield machine forms the in-hole segment reinforced ring, reinforces the tunnel structure and protects the weak segment at the hole opening; the front shield and the middle shield are translated into the station passage for disassembly and hoisting; the screw machine and the matched equipment are transported to the starting end and hoisted out. The construction efficiency of the shield disassembly is effectively improved through the adjustment of the construction steps, the optimization of the sliding translation mechanism and the jacking mechanism, the problem of the operation difficulty under the construction in the narrow space caused by the conflict between the shield end point and the existing line station is solved, the shield tail of the shield machine is utilized, the hoisting cost is reduced, the construction difficulty of the weak segment at the hole opening is fundamentally solved and the tunnel structure is twice reinforced.

Description

TECHNICAL FIELD

[0001] The present application relates to a subway engineering construction technology, in particular to a shield disassembly translation and shield tail shell construction method in a narrow space. BACKGROUND

[0002] Shield disassembly is a necessary procedure for shield retreat after shield engineering is completed. Because the volume and weight of the shield machine are large, more supporting and hoisting equipment are required. The conventional operation of domestic and foreign shield disassembly is to disassemble and hoist in the station receiving well after the shield operation is completed. This will cause difficulties in the disassembly of the shield machine in a narrow space, especially when the shield operation endpoint is a station of an existing line. Opening a hoisting well will greatly change the ground surface and underground structure of the existing line station, and cause great inconvenience to the operation of the subway station.

[0003] The shield tail is generally pulled out backward using a chain, and then hoisted out of the ground using a crane. However, the segment at the shield tail exit is very weak, so in actual engineering, the segment at the hole will be damaged to a large extent during the pulling out of the shield tail. In addition, the front, middle and rear shields have special properties, and the equipment is heavy. If complete in-hole disassembly is adopted, the completeness of the disassembled machine will be poor, and if the traditional hoisting method is used, the operation cannot be carried out in a narrow space.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application provides a shield disassembly translation and shield tail shell construction method in a narrow space to solve the above technical problems in the prior art.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] The shield disassembly translation and shield tail shell construction method in a narrow space of the present application comprises the following steps:

[0008] S1: construction preparation;

[0009] S2: shield bracket and slide rail assembly;

[0010] According to the measurement and planning arrangement of the station structure, the shield bracket, shield bracket heightening frame and slide rail are arranged at the actual exit position of the shield machine;

[0011] S3: vertical jack preliminary assembly and jacking;

[0012] After the shield bracket is installed, four vertical jack supports are welded to the lower part of both sides of the shield machine shell, and a support platform is arranged below the jack supports. A base connecting shaft is arranged under the shield machine. After completion, the four vertical jacks are placed between the jack supports and the support platform.

[0013] S4: Tunnel boring machine tail shield detachment;

[0014] Once the four vertical jacks have positioned the front and middle shields, scaffolding is erected at the connection between the tail shield and the middle shield. The weld at the connection is then opened from top to bottom. After the tail shield separates from the front and middle shields, the auger is unloaded by an electric chain hoist onto a battery-powered vehicle. Together with the rear supporting trolley, the auger is transported from the tunnel to the starting shaft and lifted out, thus leaving the rear shield within the section structure to form a segment reinforcement ring. During the process, the status of the supporting jacks is closely monitored to prevent displacement. At this point, the shield shell removal is completed, and the shield machine is moved and dismantled.

[0015] S5: Front and middle shield air ducts shift horizontally;

[0016] The shield support is driven by a self-contained movable reaction frame slide rail device to achieve longitudinal translation of the front and middle shields of the tunnel boring machine and enter the station ventilation duct;

[0017] S6: Final dismantling and translation work;

[0018] Four jacks were activated simultaneously to lift the tunnel boring machine and shield support frame in one go, change the built-in movable reaction frame slide rail device to a horizontal state, and set two jack backs on the station structure on the horizontal side of the shield support frame. The jacks were directly installed on the contact surface of the jack backs. Two jacks were activated simultaneously to move the base horizontally to the predetermined distance, completing the horizontal translation of the tunnel boring machine.

[0019] S7: Lifting operation;

[0020] After the shield machine cutterhead, front shield, and middle shield are moved laterally to the shield hoisting shaft, the cutterhead and front and middle shields are hoisted, completing the shield's horizontal movement and dismantling.

[0021] Compared with the prior art, the shield dismantling and translation and shield tail shell removal construction method in a confined space provided by the present invention can make full use of the space of the existing line station for translation and dismantling, and can also avoid the problem of damaging weak segments by using the shell removal method, and can even strengthen the segments at the tunnel entrance. Attached Figure Description

[0022] Figure 1 A construction flowchart of the shield tunneling disintegration and translation and shield tail shell removal construction method in a confined space provided by an embodiment of the present invention;

[0023] Figure 2The construction site plan of the subway shield disassembly translation and shield tail shell construction method in a narrow space is provided for the embodiment of the present application.

[0024] Figure 3 The shield bracket, steel pipe support and sliding rail engineering arrangement structure diagram is provided for the embodiment of the present application.

[0025] Figure 4 The jack support, supporting platform and base connection engineering arrangement structure diagram is provided for the embodiment of the present application.

[0026] Figure 5 The front and middle shield pushing out and shield tail separation position schematic diagram of the shield machine is provided for the embodiment of the present application.

[0027] In the figure,

[0028] 1, shield left line exit hole, 2, station air duct, 3, shield right line exit hole, 4, shield hoisting well, 5, existing line station, 6, shield machine, 7, shield bracket, 8, reinforced steel plate, 9, shield bracket heightening frame, 10, sliding rail, 11, jack support, 12, supporting platform, 13, jack. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, which does not constitute a limitation on the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0030] First, the terms that can be used in the present text are described as follows:

[0031] The term "and / or" means either of the two or both can be realized at the same time, for example, X and / or Y means three cases including "X" or "Y" and "X and Y".

[0032] The terms "include", "contain", "have", "possess" or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example: including a technical feature element (such as raw materials, components, ingredients, carriers, dosage forms, materials, sizes, parts, components, mechanisms, devices, steps, processes, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or articles, etc.) should be interpreted as not only including the explicitly listed technical feature element, but also including other technical feature elements that are not explicitly listed but are well known in the art.

[0033] The term "consisting of' shall be used in the claims to refer exclusively to the specified components. If used in the Docket as a transitional term, such term refers only to those components specifically named plus any other components necessarily present in the claim. If used in the Docket as a transitional term, such term commences a list of elements open-ended indicating that additional elements can be present not only in other claims but also in the claim itself.

[0034] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0035] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0036] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that steps can be executed in different sequence, where practical depending on the circumstances, without changing the essence of the present application.

[0037] The narrow space under-shield disassembly translation and shield tail shell construction method of the present application comprises the following steps:

[0038] S1: construction preparation;

[0039] S2: shield bracket and slide rail assembly;

[0040] According to the measurement and planning arrangement of the station structure, the shield bracket, the shield bracket heightening frame and the slide rail between the heightening frame and the shield bracket are arranged at the actual exit position of the shield machine;

[0041] S3: vertical jack preliminary assembly and jacking;

[0042] After the shield bracket is installed, four vertical jack supports are welded on the lower part of the two sides of the shield shell, and a supporting platform is arranged below the jack supports, a base connecting shaft is arranged under the shield, and after completion, the four vertical jacks are placed between the jack supports and the supporting platform;

[0043] S4: Shell removal of the shield tail of the shield machine;

[0044] After the four vertical jacks support the front and middle shields in place, a scaffold is erected at the connection between the shield tail and the middle shield, and the weld joint is blown open from top to bottom. After the shield tail is separated from the front and middle shields, the screw machine is unloaded from the electric hoist to the electric car, and together with the rear matching trolley, it is transported from the tunnel to the starting shaft by the electric car and hoisted out, so that the rear shield is reserved in the interval structure, forming a segment reinforcing ring. During the process, the state of the supporting jack is closely monitored to prevent the jack from shifting. Thus, the shell removal of the shield is completed, and the translation disassembly of the shield machine begins;

[0045] S5: Translation of the front and middle shield air ducts;

[0046] The shield bracket is pushed by a self-contained movable counterforce frame sliding rail device to realize the longitudinal translation of the front and middle shields of the shield machine and enter the station air duct;

[0047] S6: Translation disassembly and finishing work;

[0048] Synchronously start the four jacks to lift the shield machine and the shield bracket at one time, change the self-contained movable counterforce frame sliding rail device to a horizontal state, set two jack backs on one side of the shield bracket in the horizontal station structure, directly install jacks on the contact surface of the jack backs, synchronously start the two jacks to horizontally translate the base to a predetermined distance, and complete the horizontal translation of the shield machine;

[0049] S7: Hoisting operation;

[0050] After the entire assembly of the cutter head, the front shield, and the middle shield of the shield machine is horizontally translated to the position of the shield hoisting shaft, the cutter head is hoisted, and the front and middle shields are hoisted, and the translation disassembly of the shield is completed.

[0051] The step S1 comprises:

[0052] S1.1: Before the construction of the shield disassembly translation and the shell removal of the shield tail, the construction site is detected and arranged, including the collection of the station structure diagram, the measurement of the station structure, and the cleaning of the station floor;

[0053] S1.2: The preliminary preparation, design, and manufacturing of the new mechanical equipment and tooling used in the construction of the shield disassembly translation and the shell removal of the shield tail, including the manufacturing of the shield bracket or the modification of the existing shield bracket, the processing and manufacturing of the trolley sleeper support, the design and processing of the jack support and the sliding rail device, the removal of the circuit pipeline, and the rear matching trolley.

[0054] In the step S2,

[0055] The shield bracket heightening frame adopts φ600mm steel pipe for heightening;

[0056] The slide rail adopts 10mm thick steel plate for repair welding and is arranged at the contact surface directly contacted by the slide rail and the shield bracket.

[0057] In the step S3:

[0058] The jack support adopts three steel plates with a thickness of 30mm to form a triangular support after cutting and welding;

[0059] The support platform adopts 45# steel blocks to act on the bottom of the jack to form a reinforcing effect;

[0060] The base connecting shaft adopts 14# I-shaped steel to connect the shield machine and the shield machine bracket as a whole;

[0061] The vertical jack adopts 100t level to provide stable and continuous jacking force.

[0062] In the step S4, the segment reinforcing ring refers to the mechanical structure generated between the pipe segment and the soil by the shield tail of the shield machine, including the structure left between the pipe segment and the soil after the disassembly of the screw machine and the subsequent supporting trolley, so as to reinforce the weak pipe segment at the hole.

[0063] In the step S5, the front shield and the middle shield of the shield machine are translated into the station air duct for subsequent disassembly;

[0064] The self-provided movable counterforce frame slide rail device includes a socket steel beam, a triangular counterforce frame, a steel round pin, a hydraulic jack and a hydraulic pump station;

[0065] The longitudinal translation operation of the front shield and the middle shield of the shield machine includes:

[0066] S5.1: The triangular counterforce frame is in place, fixed on the steel beam with a round pin, the jack is installed, the hydraulic pipeline is checked, and the steel beam is smeared with lubricating oil;

[0067] S5.2: Start the jack, close after reaching 5t, check whether the triangular counterforce frame / jack has displacement, whether the force surface of the jack is tightly attached, etc., continue to start the jack after meeting the requirements, the sliding speed is controlled within 60mm / min, the deviation between the steel beam and the triangular counterforce frame is measured to ensure the sliding direction;

[0068] S5.3: Close the jack after sliding 1m, move the triangular counterforce frame to perform the next cycle of translation.

[0069] In the step S6:

[0070] The shield machine and shield support are lifted to a height of 200mm at one time, which creates a gap between the shield machine support and the self-contained movable reaction frame slide rail device, thereby removing the socket steel beam and changing the translation direction.

[0071] Two jack backs are installed on the station structure on one side of the shield bracket, one side is installed at the head of the front shield, and the other side is installed at the tail of the middle shield.

[0072] The back of the jack is made of 50# I-beam steel, which acts as a reinforcement at the back of the jack;

[0073] The lateral translation of the base to the predetermined distance should ensure that the center of the shield tunnel coincides with the center of the standard section structure.

[0074] In summary, the shield dismantling and translation and tail shell removal construction method in confined spaces of the present invention effectively improves the efficiency of shield dismantling by adjusting the construction sequence, optimizing the sliding translation mechanism and the jacking mechanism, and solves the problem of construction difficulties in confined spaces caused by the conflict between the shield end point and the existing line station. Through the shield shell removal method, the shield tail of the shield machine is utilized, the hoisting cost is reduced, and the construction difficulty of the weak segments at the tunnel entrance is fundamentally solved, thereby strengthening the tunnel structure a second time.

[0075] The beneficial technical effects are:

[0076] 1. By improving the construction sequence and construction site, the limited space was effectively utilized, resource input was reduced, and construction efficiency was improved.

[0077] 2. The shield tail section remains between the tunnel lining segments and the soil, eliminating the need for hoisting and transportation of the shield tail and effectively avoiding safety issues that might arise from lifting the shield tail out.

[0078] 3. The shield tail is reused to form a segment reinforcement ring while conserving resources. This strengthens the weak points of the segments at the tunnel entrance, thereby protecting the segments exiting the tunnel and further enhancing the overall strength of the tunnel.

[0079] 4. To make more rational use of the limited space, avoid direct dismantling in the tunnel, which would reduce the reliability, wear rate and reuse rate of parts, and at the same time avoid damaging the underground and surface structures around the existing line station and eliminating major safety hazards in the tunnel in order to add a hoisting shaft.

[0080] To more clearly demonstrate the technical solution and its effects provided by the present invention, the embodiments of the present invention will be described in detail below with reference to specific examples.

[0081] Example 1

[0082] like Figures 1 to 5 As shown:

[0083] The construction method is buried and disassembled by rear shield shell removal and mechanical translation in a narrow space, thereby improving construction efficiency.

[0084] The specific technical solutions are as follows:

[0085] I. Construction preparation

[0086] Before construction, a position relationship diagram of the existing line air duct and the shield tunneling route is drawn, so that the air duct space can be used for the translation of the shield machine into the inside to complete the disassembly and hoisting, and corresponding tooling is prepared before construction.

[0087] II. Shield bracket and slide rail assembly

[0088] As shown in Figure 2 , the reinforcing steel plate is firmly welded with the slide rail in the shield receiving stage, so that the strength between the direct contact surface of the shield bracket and the slide rail is increased, and the displacement deviation problem caused by the relative movement between the slide rail and the shield bracket and the accelerated wear of the slide rail is prevented, and the shield bracket pad is raised, so that the height difference between the existing height of the shield machine and the height of the air duct section is reduced.

[0089] III. Vertical jack preliminary assembly and jacking

[0090] As shown in Figure 3 , Figure 4 , the steel plate and the shell contact surface of the jack support are cut into a circular arc shape and double-face welded before jacking, the base connecting shaft is pre-installed between the shield machine support and the shell, the jacking shell gravity is dispersed, the fatigue cracking caused by the weak mechanical properties of the jack support weld is prevented, and the inclination problem in the shell jacking process is prevented. The jack support platform solves the problem of insufficient stroke that may occur during the jacking process, and strengthens the strength of the jacking process.

[0091] IV. Shield machine shield tail shell removal

[0092] As shown in Figure 5 , after the shield machine is received, the weld joint at the connection between the middle shield and the shield tail is completely blown open, so that the shield tail is buried between the segment and the soil, forming a segment reinforcing ring, thereby reducing the shield tail hole and subsequent hoisting work, and the weak segment at the hole is strengthened, and the structure stability of the whole tunnel is better protected.

[0093] V. Translation in the front shield and middle shield air duct

[0094] The self-activity type counterforce frame sliding rail device enables the front shield and the middle shield to be stably longitudinally translated and completely enter the air duct, and then a jack is used to lift, so that the sliding rail device is spaced from the shield machine support, the sliding rail device is adjusted to be transverse, and further translation is performed by cooperating with a transverse jack. The shield hoisting well is arranged at the transverse bottom end of the air duct, the station air duct is reasonably utilized, the arrangement of the shield hoisting well does not change the ground surface and underground structure of the existing line station.

[0095] Six, disassembly, translation and ending operation

[0096] After the air duct translation is completed, cutter head hoisting and front shield and middle shield hoisting are performed at the shield hoisting well, and after the shield machine shield tail shell-off operation is completed, the screw machine and the rear matched trolley are simultaneously disassembled and removed, and are transported to the starting well mouth to be hoisted out, and thus the whole construction process of the shield disassembly, translation and shield tail shell-off construction method in a narrow space is completed.

[0097] The above merely describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. The information disclosed in the background section of the present application is merely intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes the prior art known to the person skilled in the art.

Claims

1. A construction method for shield disassembly translation and shield tail unshelling in a narrow space, characterized in that, The method comprises the following steps: S1: construction preparation; S2: shield bracket and slide rail assembly; According to the measurement and planning arrangement of the station structure, the shield bracket and the shield bracket cushion stand are arranged at the actual exit position of the shield machine, and the slide rail is arranged between the cushion stand and the shield bracket; S3: vertical jack preliminary assembly and jacking; After the shield bracket is installed, four vertical jack supports are welded on the lower part of the two sides of the shield machine shell, a supporting platform is arranged below the jack support, a base connecting shaft is arranged below the shield machine, and after the completion, the four vertical jacks are arranged between the jack support and the supporting platform; S4: shield tail shell removal; After the four vertical jacks support the front and middle shields in place, a scaffold is erected at the connection between the shield tail and the middle shield, the connection is blown open from top to bottom, and after the shield tail is separated from the front and middle shields, the screw machine is unloaded from the electric chain to the electric car, and together with the rear supporting trolley, it is transported from the tunnel to the starting well by the electric car and hoisted out, so that the rear shield is reserved in the interval structure, forming a segment reinforcing ring, and the state of the supporting jack is closely observed during the process to prevent the jack from shifting, thus completing the shield shell removal and starting the shield machine translation disassembly; S5: front shield and middle shield air duct translation; The shield bracket is pushed by a self-provided movable counterforce frame slide rail device to realize longitudinal translation of the front and middle shields of the shield machine and enter the station air duct; After the front and middle shields of the shield machine are translated into the station air duct, subsequent disassembly is carried out; The self-provided movable counterforce frame slide rail device comprises a socket type steel beam, a triangular counterforce frame, a steel round pin, a hydraulic jack and a hydraulic pump station; S6: translation disassembly finishing operation; Four jacks are started synchronously to lift the shield machine and the shield bracket at one time, the self-provided movable counterforce frame slide rail device is changed to a horizontal state, two jack back supports are arranged on one side of the shield bracket in the station structure, jacks are directly installed on the contact surface of the jack back supports, two jacks are started synchronously to horizontally translate the base to a predetermined distance, and the horizontal translation of the shield machine is completed; S7: hoisting operation; After the whole assembly parts of the cutter head, the front shield and the middle shield are horizontally translated to the shield hoisting well position, the cutter head is hoisted, the front and middle shields are hoisted, and the shield translation disassembly is completed; The step S1 comprises: S1.1 shield disassembly translation and shield tail shell removal before construction, including station structure diagram collection, station structure measurement and station bottom plate cleaning; S1.2 preliminary preparation, design and manufacture of new mechanical equipment and tools used in shield disassembly translation and shield tail shell removal, including shield bracket manufacturing or existing shield bracket modification, sleeper support processing and manufacturing, jack support and slide rail device design and processing, and removal circuit pipeline and rear supporting trolley.

2. The method according to claim 1, wherein, In the step S2: The shield bracket cushion stand is raised by a φ600mm steel pipe; The slide rail is supplemented by a 10mm thick steel plate, and is arranged on the contact surface directly contacted by the slide rail and the shield bracket.

3. The method according to claim 2, wherein, In the step S3: The jack support is a triangular support formed by welding three steel plates with a thickness of 30mm after cutting; The supporting platform is a 45# steel block acting on the bottom of the jack to form a reinforcing effect; The base connecting shaft is made of 14# I-shaped steel to connect the shield machine and the shield machine bracket as a whole. The vertical jack is of 100t level to provide stable and continuous jacking force.

4. The method according to claim 3, wherein, In the step S4, the segment reinforcing ring refers to the mechanical structure generated by the shield tail of the shield machine buried between the segment and the soil, including the structure left between the segment and the soil after the shield tail is disassembled from the screw machine and the rear supporting trolley, so as to reinforce the weak segment at the hole.

5. The method according to claim 4, wherein, In the step S5, the longitudinal translation operation of the front and middle shields of the shield machine includes: S5.1: the triangular counterforce frame is positioned and fixed on the steel beam by round pins, the jack is installed, the hydraulic pipeline is checked, and the steel beam is smeared with lubricating oil; S5.2: the jack is started, and after reaching 5t, it is closed, the triangular counterforce frame / jack is checked for displacement, and the force receiving surface of the jack is checked for tightness, and after meeting the requirements, the jack is continuously started, the sliding speed is controlled within 60mm / min, the deviation between the steel beam and the triangular counterforce frame is measured to ensure the sliding direction; S5.3: after sliding 1m, the jack is closed, the triangular counterforce frame is moved forward for the next cycle of translation.

6. The method according to any one of claims 1 to 5, wherein, In the step S6: The one-time jacking height of the shield machine and the shield bracket is 200mm, so that the shield bracket and the self-provided movable counterforce frame sliding rail device generate a gap, so as to extract the socket type steel beam and change the translation direction; The shield bracket is provided with two jack backs on the transverse one side of the station structure, one on the front shield head and the other on the middle shield tail. The jack back is made of 50# I-shaped steel, which acts on the rear of the jack to form reinforcement; The horizontal translation of the base to the predetermined distance should ensure that the center of the shield coincides with the center of the standard segment structure.

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