Movable supporting device for tunnel construction and tunnel construction method

Abstract

The invention discloses a movable supporting device for tunnel construction and a tunnel construction method. The problems that in the prior art, underground excavation construction of underground engineering is high in price and tedious in working procedure are solved. The movable supporting device for tunnel construction comprises a double-layer sleeve mechanism and a pushing mechanism used for providing jacking of the double-layer sleeve mechanism. The pushing mechanism comprises an outer-layer pushing driving part and an inner pushing driving part; the double-layer sleeve mechanism comprises an outer-layer sleeve and N inner sleeves, and N is larger than or equal to 2; the inner sleeves correspond to the inner pushing driving parts, the outer pushing driving parts correspond to the outer sleeves, and the adjacent inner sleeves, the inner sleeves and the outer sleeves and the outer sleeves and the tunnel can move relatively under the action of the pushing mechanisms. The equipment adopted by the invention is simple, efficient and low in manufacturing cost; meanwhile, excavation equipment can be flexibly selected according to actual conditions, and the reusability of the excavation equipment is good; and large-scale engineering application is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a supporting device for tunnel construction. Background Art

[0002] At present, underground engineering dark excavation construction mainly adopts two methods: traditional mining method and mechanical method. However, the traditional mining method has inherent disadvantages such as cumbersome support procedures, long construction period, poor working environment, and large material waste in the construction of large-section underground projects. The mechanical dark excavation method currently mainly refers to a type of construction method that uses equipment such as pipe jacking machines, shield machines, and TBM tunneling machines for construction operations. Most of the equipment used in this type of construction method is high-precision equipment with high mechanical original value and low reusability. The cost of a single project is high, which has led to the inability of the mechanical method to be applied on a large scale.

[0003] In recent years, with the development of science and technology, there have been a variety of improved technical studies on mining methods and mechanical methods, such as those recorded in Chinese patents with publication numbers CN105781595A, CN 114607397 A and CN213898973U, which divide and combine the cross-sections, which is an improvement on the mechanical dark excavation method, but its essence is still a combination of multiple high-precision excavation equipment, and it does not solve the problems of high price and low applicability. In addition, for the improvement technology of the traditional mining method, such as the patent with publication number CN114790896A, its essence is an improved method of the mining method. During the construction process, it is still necessary to do initial support first and then do secondary structure, which does not solve the problems of cumbersome mining procedures, long construction period, poor working environment and large material waste. Therefore, it is necessary to design a new type of equipment and method that can effectively reduce the equipment cost and solve the inherent shortcomings of the mining method. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a mobile support device for tunnel construction and a tunnel construction method, which solves the problems of high cost and complicated procedures in underground engineering dark excavation construction in the prior art.

[0005] The technical solution of the present invention is implemented as follows: a mobile support device for tunnel construction, including a double-layer sleeve mechanism and a jacking mechanism for providing jacking of the double-layer sleeve mechanism; the jacking mechanism includes an outer jacking drive member and an inner jacking drive member; the double-layer sleeve mechanism includes an outer sleeve and N inner sleeves, N≥2; the inner sleeve corresponds to the inner jacking drive member, the outer jacking drive member corresponds to the outer sleeve, and adjacent inner sleeves, inner sleeves and outer sleeves, and outer sleeves and tunnels can move relative to each other under the action of the jacking mechanism.

[0006] Further preferably, the pushing mechanism also includes a grid-type bracket, the grids of the grid-type bracket respectively correspond to the outer sleeve and the N inner sleeves, the outer pushing drive member is arranged on the rear end face of the grid-type bracket, and the internal pushing drive member is arranged on the front end face of the grid-type bracket.

[0007] Further preferably, the outer pushing drive component includes a plurality of outer pushing cylinders; the outer pushing cylinders are evenly arranged along the rear end surface of the grid-type support; the internal pushing drive component includes a plurality of inner pushing cylinders, and the inner pushing cylinders are evenly arranged along the front end surface of the grid-type support.

[0008] Further preferably, N inner sleeves are arranged in parallel inside the outer sleeve, and the N inner sleeves divide the interior of the outer sleeve into N closed areas; the cross-sectional structure formed by the N inner sleeves is consistent with the internal cross-sectional structure of the outer sleeve; ensuring that the excavation equipment excavates the soil corresponding to the outer sleeve without blind spots.

[0009] Further preferably, a directional sliding mechanism is provided between adjacent inner sleeves and between an inner sleeve and an outer sleeve, wherein the directional sliding mechanism comprises a matching track groove and a slide rail, and the track groove and / or the slide rail are provided on the inner wall of the outer sleeve and the outer wall of the corresponding inner sleeve along the tunneling direction.

[0010] Further preferably, the mobile support device for tunnel construction further comprises a plurality of movable rotatable pads used in conjunction with the jacking mechanism; the movable rotatable pads are detachably arranged on the inner wall of the outer sleeve and can move with the inner sleeve. The movable rotatable pads are used Further preferably, the movable rotatable pad includes a pad, a moving block is rotatably provided in the middle of the pad, the moving block cooperates with a slide groove provided on the inner wall of the outer sleeve, and fixed lock buckles are provided at both ends of the pad; the pad moves with the inner sleeve through a traction member. Specifically, the moving block is slidably or rollably matched with the slide groove, and when the moving block is slidably matched with the slide groove, the moving block is located in the slide groove and slidably matched with the slide groove; when the moving block is rollably matched with the slide groove, a roller matching with the slide groove is provided on the moving block; the moving block is rotatably matched with the through hole in the center of the pad through the central rotating shaft, and the pad is limited on the central rotating shaft by a nut member threadedly matched with the central rotating shaft.

[0011] A tunnel construction method based on the mobile support device for tunnel construction, the steps are as follows: S1, working shaft construction; according to the plane layout of the entrance and exit passages to be excavated, select suitable locations around the proposed entrance and exit passages to build vertical shaft working shafts. The vertical shaft working shafts are arranged at both ends of the proposed dark excavation construction passage section to form a starting shaft and a receiving shaft; set up grouting reinforcement areas, backing structures, and temporary support components in the vertical shaft working shafts.

[0012] S2, complete the installation and commissioning of mobile support devices and excavation equipment in the starting well.

[0013] S3, conduct initial excavation; break the starting side wall within the shield range of the double-layer sleeve mechanism, and then, under the support of the first internal sleeve, excavate the soil corresponding to the area and transport the slag out. After excavation to the designed advance, use the internal sleeve to push the driving part, and the pushing distance is the same as the excavation advance; then, synchronously step-by-step excavation is carried out on the corresponding soil under the support of the first internal sleeve and the second internal sleeve. After excavation to the designed advance, push the first internal sleeve and the second internal sleeve at the same time, and the pushing distance is the same as the excavation advance; and so on, complete the initial excavation of N internal sleeves.

[0014] In step S3, when pushing the inner sleeve forward, if the cylinder stroke of the front pushing drive member is insufficient, a movable rotating shim is used to turn its shim block from a vertical state to a horizontal state and install it to the end of the cylinder to increase the pushing stroke, so that the N inner sleeves form a stepped excavation state.

[0015] S4, continuous excavation; after the initial excavation is completed, the outer sleeve is pushed by the outer pushing drive, and the pipe segment or support structure is assembled at the tail of the outer sleeve; then the soil in the corresponding areas of N inner sleeves is excavated simultaneously, and the synchronous step-by-step excavation state is maintained until the tunnel is broken through.

[0016] S5, receiving by tunnel boring machine: completing the receiving of mobile support device and excavation equipment in the receiving well.

[0017] The beneficial effects of the present invention are as follows: the mobile support device for tunnel construction of the present invention adopts a double-layer sleeve mechanism and a jacking mechanism for providing jacking of the double-layer sleeve mechanism to carry out mechanized step-by-step construction. Compared with the mining method, no initial support is required, which greatly simplifies the construction process, shortens the construction period, and reduces the waste of engineering materials. At the same time, since there is no spraying and mixing process, the working environment in the tunnel is greatly improved; and compared with mechanical construction, the equipment used in the present invention is simple, efficient, and low in cost; at the same time, the excavation equipment can be flexibly selected according to the actual situation, and the tunneling equipment has good reusability; it is conducive to large-scale engineering applications.

[0018] In the construction method of the present invention, the excavation process refers to the step method, that is, the internal sleeve faces are kept at a certain distance to ensure that the soil section excavated in each step is small, and the surrounding rock and the face can remain stable under the support of the internal sleeve without collapse and instability, thereby greatly improving the construction safety; it will provide a more economical, environmentally friendly, fast and simple construction method for the construction of underground projects. On the basis of improving the level of construction mechanization, the construction of underground projects will be safer and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the internal structure of the mobile supporting device of the present invention; Figure 2 It is a schematic side view of the internal structure of the mobile support device of the present invention; Figure 3 It is a schematic diagram of the grid-type support in the push mechanism; Figure 4 It is a schematic diagram of a movable rotating pad in a vertical state; Figure 5 It is a schematic diagram of the movable rotating pad in a horizontal state; Figure 6 This is a plan view of the working well used in the present invention; Figure 7 This is a schematic diagram of the initial excavation of the first inner sleeve; Figure 8 This is a schematic diagram of the initial excavation of the first inner sleeve; Fig. 9 This is a schematic diagram of the initial excavation of the second inner sleeve; Fig.10 This is a schematic diagram of the interior of the initial excavation of the second inner sleeve; Fig.11 This is a schematic diagram of the initial excavation of the third inner sleeve; Fig.12 This is a schematic diagram of the initial excavation of the third inner sleeve; Fig.13 This is a schematic diagram of the initial excavation of the fourth inner sleeve; Fig.14 This is a schematic diagram of the interior of the initial excavation of the fourth inner sleeve; Fig.15 It is a schematic diagram of continuous excavation of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] Embodiment 1, as Figure 1 ,2 As shown, a mobile support device for tunnel construction includes a double-layer sleeve mechanism 2 and a jacking mechanism 1 for providing jacking of the double-layer sleeve mechanism 2; the double-layer sleeve mechanism 2 cooperates with the step-by-step construction so that each operation process is carried out under the protection of the retaining sleeve, the construction is safe and efficient, and the permanent structure can be cast in situ or prefabricated according to actual needs, and the application is flexible. In this embodiment, the jacking mechanism 1 includes an outer jacking drive 101 and an inner jacking drive 102, corresponding to the outer sleeve 201 and the inner sleeve 202 of the double-layer sleeve mechanism; so that the outer sleeve 201 and the inner sleeve 202 can perform pushing actions respectively. The double-layer sleeve mechanism 2 described in this embodiment includes an outer sleeve 201 and N inner sleeves 202, N≥2; the cross-section of the outer sleeve is basically consistent with the planned excavation cross-section; the inner sleeve is divided into a number of small cross-sections according to the planned cross-section of the partial excavation, and each small sleeve is independently closed. The inner sleeve is composed of a number of small sleeves. The inner sleeve 202 corresponds to the inner jacking drive member 102, and the outer jacking drive member 101 corresponds to the outer sleeve 201. The inner jacking drive member 102 performs a jacking action on the inner sleeve 202; the outer jacking drive member 101 performs a jacking action on the outer sleeve 201. Adjacent inner sleeves 202, inner sleeves 202 and outer sleeves 201, and outer sleeves 201 and tunnels can move relative to each other under the action of the jacking mechanism 1; that is, the inner sleeve 202 and the outer sleeve 201 can both be independently jacked and moved; so as to realize stepped excavation.

[0023] like Figure 2 As shown, the pushing mechanism 1 described in this embodiment also includes a grid support 103, which is arranged at the rear end of the outer sleeve and can be pushed forward together with the outer sleeve. The grids of the grid support 103 correspond to the outer sleeve 201 and the N inner sleeves 202 respectively; that is, the outermost ring grid of the grid support 103 corresponds to the outer sleeve, and N grids are arranged inside it, and the N grids correspond to the N inner sleeves; the outer layer pushing drive 101 is arranged on the rear end face of the grid support 103 and is located on the outermost ring grid; the outer layer pushing drive can push on the assembled pipe segment 4 to provide it with power to push the outer sleeve; the internal pushing drive 102 is arranged on the front end face of the grid support 103 and is located on the internal grid, and is used to push the corresponding inner sleeve.

[0024] The outer layer push drive member 101 described in this embodiment includes a plurality of outer layer push cylinders; the outer layer push cylinders are evenly arranged along the rear end face of the grid-type support 103; and it is ensured that the outer layer push cylinders can act on the end face of the outer sleeve wall. The inner layer push drive member 102 includes a plurality of inner layer push cylinders, which are evenly arranged along the front end face of the grid-type support 103, and it is ensured that the inner layer push cylinders can act on the end face of the inner sleeve wall. The cylinders are arranged in zones, and the cylinders corresponding to the outer sleeve and the inner sleeve arranged in the zones, whose pushing direction is consistent with the tunnel excavation direction, are the inner layer push cylinders, which provide pushing power for the inner sleeve; the cylinders opposite to the tunnel excavation direction are the outer layer push cylinders, which provide pushing power for the outer sleeve.

[0025] In this embodiment, N inner sleeves 202 are arranged in parallel inside the outer sleeve 201, and the inner sleeves 202 divide the inner part of the outer sleeve 201 into N closed areas. The cross-sectional structure formed by the N inner sleeves 202 is consistent with the internal cross-sectional structure of the outer sleeve 201, ensuring that the excavation equipment excavates the soil corresponding to the outer sleeve without blind areas, and achieving full-section excavation.

[0026] Traditional shield equipment needs to be equipped with multiple rear supporting trolleys, which takes up a lot of space when starting as a whole, and has a complex construction process and low efficiency when starting in parts. The support device of the present invention can simplify the equipment structure, reduce the number of rear supporting trolleys, and make the starting and receiving construction more flexible.

[0027] Embodiment 2, a tunnel construction method based on the mobile support device for tunnel construction described in Embodiment 1, comprising the following steps: S1, working shaft construction; according to the plane layout position of the entrance and exit passage to be excavated, a suitable position is selected around the proposed entrance and exit passage to build a vertical shaft working shaft 100, and the vertical shaft working shaft 100 is arranged at both ends of the proposed dark excavation construction passage section to form a starting shaft and a receiving shaft; a grouting reinforcement area 1001, a backing structure 1002, and a temporary support member 1003 are set in the vertical shaft working shaft 100. Before construction, the size and shape of the external sleeve and the size and shape of the internal sleeve are fitted according to the tunnel section and the partial excavation area division.

[0028] S2, complete the installation and commissioning of mobile support devices and excavation equipment in the starting well.

[0029] S3, perform initial excavation; break the starting side wall 1004 within the shield range of the double-layer sleeve mechanism 2, and then, under the support of the first internal sleeve 202, excavate the soil corresponding to the area and transport the slag out. After excavating to the designed advance, use the internal sleeve 202 to push the internal sleeve 202, and the pushing distance is the same as the excavation advance; then, synchronously step-by-step excavate the corresponding soil under the support of the first internal sleeve 202 and the second internal sleeve 202. After excavating to the designed advance, push the first internal sleeve 202 and the second internal sleeve 202 at the same time, and the pushing distance is the same as the excavation advance; and so on, complete the initial excavation of N internal sleeves 202.

[0030] S4, continue excavation; after the initial excavation is completed, the outer layer pushing driving member 101 is used to push the outer layer sleeve 201, and the pipe segment or supporting structure is assembled at the tail of the outer layer sleeve 201; then continue to excavate the soil in the corresponding areas of the N inner sleeves 202 at the same time, and maintain the synchronous step-by-step excavation state until the tunnel is broken through.

[0031] S5, receiving by tunnel boring machine: completing the receiving of mobile support device and excavation equipment in the receiving well.

[0032] Compared with the mining method, the above-mentioned construction method of the present invention does not require initial support, and eliminates the initial support process of "initial spraying → laying steel mesh → erecting steel arch frame or grid steel frame → re-spraying". The permanent structure is directly installed or cast under the protection of the support device sleeve, which greatly simplifies the construction process, shortens the construction period, and reduces the waste of engineering materials. At the same time, since there is no spraying and mixing process, the working environment in the tunnel has been greatly improved. Compared with mechanical construction, the equipment used in this method is simple, efficient, and low-cost; at the same time, this method can flexibly select excavation equipment according to actual conditions, and the tunneling equipment has good reusability; it is conducive to large-scale engineering applications.

[0033] Embodiment 3, a mobile support device for tunnel construction, this embodiment is further preferred on the basis of embodiment 1, in this embodiment, a directional sliding mechanism is provided between adjacent inner sleeves 202 and between the inner sleeve 202 and the outer sleeve 201. That is, each inner sleeve and the inner sleeve and the outer sleeve can slide; to ensure the stability of the support. In this embodiment, as a preferred embodiment, the directional sliding mechanism includes a matching rail groove 203 and a slide rail 204, and the rail groove 203 and / or the slide rail 204 are arranged on the inner wall of the outer sleeve 201 and the corresponding outer wall of the inner sleeve 202 along the tunnel excavation direction. For the outer sleeve, the inner wall is provided with a rail groove along the axial direction, and the outer wall of the corresponding inner sleeve is provided with a slide rail, so as to realize the stable sliding of the inner sleeve relative to the outer sleeve; for the inner sleeve, the outer wall is provided with a rail groove along the axial direction, and the outer wall of the adjacent inner sleeve is provided with a slide rail, so as to realize the stable sliding between the two adjacent inner sleeves.

[0034] In this embodiment, the mobile supporting device for tunnel construction also includes a number of movable rotatable shims 3 used in conjunction with the jacking mechanism 1; the movable rotatable shims 3 are detachably arranged on the inner wall of the outer sleeve 201 and can move with the inner sleeve 202; the movable rotatable shims move with the inner sleeve 202, and when the inner propulsion cylinder of the internal jacking drive 102 has insufficient cylinder stroke during the jacking process of the inner sleeve, the movable rotatable shims 3 are placed between the inner sleeve and the inner propulsion cylinder to ensure continuous jacking of the inner sleeve.

[0035] Specifically, if Figure 4 , 5 As shown, the movable rotating pad 3 includes a pad 301, and a moving block 302 is rotated in the middle of the pad 301. The moving block 302 cooperates with a slide groove 304 set on the inner wall of the outer sleeve 201. The moving block 302 moves along the slide groove to drive the movement of the pad. The slide groove is set along the axial direction of the outer sleeve. The pad can be a long rectangular block to increase the effective length of the pad. Fixed locks 303 are provided at both ends of the pad 301; when the pad is not in use, the pad is in a vertical state to reduce the occupied space; when the pad needs to be used, the pad can be removed and fixed between the oil cylinder and the inner sleeve through the fixed lock and in a horizontal state to increase the propulsion stroke of the oil cylinder. The pad 301 moves with the inner sleeve 202 through a traction member; the traction member can be a wire rope, etc.; it moves with the inner sleeve, and when the push stroke needs to be increased, it can be taken and used at any time, which is simple and convenient. The moving block 302 in this embodiment is slidably matched or rolled with the slide groove 304. Multiple moving blocks can be connected in series in one slide slot to adapt to oil cylinders with different strokes. It should be noted that when the moving block 302 slides with the slide slot 304, the moving block 302 is located in the slide slot 304 and slides with the slide slot 304; when the moving block 302 rolls with the slide slot 304, a roller matching the slide slot 304 is provided on the moving block 302. The moving block 302 rotates with the through hole in the center of the cushion block 301 through the central rotating shaft 305; to facilitate the change of the cushion block state, the cushion block 301 is limited on the central rotating shaft 305 by a nut member threadedly matched with the central rotating shaft 305; the cushion block can be flexibly disassembled and assembled. When the stroke of the oil cylinder is not enough, the shim is rotated and positioned to increase the length of the shim and assist the inner sleeve to be pushed into place.

[0036] Embodiment 4, in this embodiment, N=4 is taken as an example, that is, the double-layer sleeve mechanism 2 has one outer sleeve 201 and four inner sleeves 202; the entire section is divided into four parts; based on the tunnel construction method of the mobile support device for tunnel construction, a mechanized step method is adopted for construction, and the entire section is divided into four parts as an example, which is divided into initial excavation and continuous excavation; the specific steps are as follows: S1, working pit construction; Figure 6As shown, according to the planar layout of the entrance and exit passages to be excavated, a suitable position is selected around the proposed entrance and exit passages to build a vertical shaft working shaft 100, and the vertical shaft working shaft 100 is arranged at both ends of the proposed dark excavation construction passage section to form a starting shaft and a receiving shaft; a grouting reinforcement area 1001, a rear structure 1002, and a temporary support member 1003 are set in the vertical shaft working shaft 100; the working shaft is only a starting and receiving space for excavation equipment, such as existing underground spaces, such as existing station main structures, existing tunnels, existing basements, etc., if the space or platform size meets the starting and receiving requirements, a separate working shaft may not be set.

[0037] S2, complete the installation and commissioning of the mobile support device and excavation equipment in the starting shaft; this embodiment uses a small cantilever tunneling machine for excavation operations, and a variety of tunneling machines such as excavators and crushers can be flexibly selected on site according to actual conditions.

[0038] S3, initial excavation; break the starting side wall 1004 within the shield range of the double-layer sleeve mechanism 2, and then excavate the soil corresponding to the area and transport the slag under the support of the first inner sleeve 202. After excavating to the designed footage, use the upper push drive member 102 to push the inner sleeve 202, and the pushing distance is the same as the excavation footage; Figure 7 , 8 As shown, then, the corresponding soil is excavated synchronously in steps under the support of the first inner sleeve 202 and the second inner sleeve 202. After the first inner sleeve is excavated to the second design footage and the second inner sleeve is excavated to the first design footage, the first inner sleeve 202 and the second inner sleeve 202 are pushed in simultaneously, and the pushing distance is the same as the excavation footage, as shown in FIG. Fig. 9 , 10 Similarly, the first, second, and third internal sleeves 202 are excavated synchronously in steps, as shown in FIG. Fig.11 , 12 Then, the first, second, third, and fourth internal sleeves 202 are excavated synchronously in steps, as shown in FIG. Fig.13 , 14 As shown in the figure, at this point, the excavation of the soil in the four areas corresponding to the four internal sleeves and the advancement of the sleeves are completed. At this point, the four sleeves are pushed forward in a stepped manner.

[0039] In step S3, when pushing the internal sleeve 202, if the cylinder stroke of the front pushing drive member 102 is insufficient, a movable rotating shim 3 is used to turn its shim block from a vertical state to a horizontal state and install it to the end of the cylinder to increase the pushing stroke, so that the N internal sleeves 202 form a stepped excavation state.

[0040] S4, continuous excavation; Fig.15As shown, after the initial excavation is completed, the outer layer pushing driving member 101 is used to push the outer layer sleeve 201, and the pipe segment or support structure is assembled at the tail of the outer layer sleeve 201; this embodiment adopts a prefabricated assembly scheme, and a template trolley cast-in-place scheme can also be adopted. The specific implementation can be flexibly adjusted according to actual conditions. Then continue to excavate the soil in the corresponding areas of the four inner sleeves 202 at the same time, and maintain a synchronous step-by-step excavation state until the tunnel is broken through.

[0041] S5, receiving by the tunnel boring machine: receiving the mobile support device and excavation equipment in the receiving well. If the construction site does not have the conditions to build a receiving working well, the outer large shield shell can be discarded and the inner small shield shell can be disassembled and transported out.

[0042] As described above, in the construction of the tunnel boring machine of the present invention, the jacking mechanism pushes the internal sleeves one by one, and at the same time completes the soil excavation of the area in the internal sleeve. During the excavation process, the step method is referred to, and the internal sleeve faces are kept at a certain distance to ensure that the soil section excavated in each step is small, and the surrounding rock and the face can remain stable without collapse and instability under the support of the internal sleeve. After completing a tunneling cycle, the assembly operation or casting operation is carried out under the support of the tail outer sleeve to complete the construction of the permanent structure. Then the next cycle of construction operations is carried out in sequence until the entire underground project is connected, and the tunneling equipment is disassembled and transported out. Therefore, according to the present invention, the safe excavation of large-section underground structures can be achieved, and there is no need to apply initial support, and the process is simple and efficient; at the same time, due to its simple equipment, the excavation and slag discharge system can be flexibly selected according to actual conditions, and the original value of the equipment is low, which is conducive to large-scale promotion and application.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mobile support device for tunnel construction, characterized in that: The invention comprises a double-layer sleeve mechanism (2) and a jacking mechanism (1) for providing jacking for the double-layer sleeve mechanism (2); the jacking mechanism (1) comprises an outer jacking driving member (101) and an inner jacking driving member (102); the double-layer sleeve mechanism (2) comprises an outer sleeve (201) and N inner sleeves (202), N≥2; the inner sleeve (202) corresponds to the inner jacking driving member (102), the outer jacking driving member (101) corresponds to the outer sleeve (201), and adjacent inner sleeves (202), the inner sleeve (202) and the outer sleeve (201), and the outer sleeve (201) and the tunnel can move relative to each other under the action of the jacking mechanism (1).

2. The mobile support device for tunnel construction according to claim 1, characterized in that: The pushing mechanism (1) further comprises a grid-type support (103), wherein the grids of the grid-type support (103) correspond to the outer sleeve (201) and the N inner sleeves (202), respectively, the outer pushing drive member (101) is arranged on the rear end surface of the grid-type support (103), and the inner pushing drive member (102) is arranged on the front end surface of the grid-type support (103).

3. The mobile support device for tunnel construction according to claim 2, characterized in that: The outer layer thrust driving member (101) comprises a plurality of outer layer thrust cylinders, which are evenly arranged along the rear end surface of the grid-type support (103); and the inner layer thrust driving member (102) comprises a plurality of inner layer thrust cylinders, which are evenly arranged along the front end surface of the grid-type support (103).

4. The mobile support device for tunnel construction according to any one of claims 1 to 3, characterized in that: N inner sleeves (202) are arranged in parallel inside the outer sleeve (201), and the N inner sleeves (202) divide the interior of the outer sleeve (201) into N closed areas.

5. The mobile support device for tunnel construction according to claim 4, characterized in that: Directional sliding mechanisms are provided between adjacent inner sleeves (202) and between an inner sleeve (202) and an outer sleeve (201); the directional sliding mechanisms include matching rail grooves (203) and slide rails (204); the rail grooves (203) and / or slide rails (204) are provided on the inner wall of the outer sleeve (201) and the outer wall of the corresponding inner sleeve (202) along the tunnel excavation direction.

6. The mobile support device for tunnel construction according to claim 1 or 5, characterized in that: It also includes a plurality of movable rotatable washers (3) used in conjunction with the pushing mechanism (1); the movable rotatable washers (3) are detachably arranged on the inner wall of the outer sleeve (201) and can move with the inner sleeve (202).

7. The mobile support device for tunnel construction according to claim 6, characterized in that: The movable rotating washer (3) comprises a pad (301), a moving block (302) is rotatably provided in the middle of the pad (301), the moving block (302) cooperates with a slide groove (304) provided on the inner wall of the outer sleeve (201), and fixed lock buckles (303) are provided at both ends of the pad (301); the pad (301) moves with the inner sleeve (202) through a traction member.

8. The mobile support device for tunnel construction according to claim 7, characterized in that: The moving block (302) is rotationally matched with the through hole at the center of the cushion block (301) via the central rotating shaft (305), and the cushion block (301) is limited on the central rotating shaft (305) via a nut member threadedly matched with the central rotating shaft (305).

9. A tunnel construction method based on the mobile support device for tunnel construction according to claim 1 or 8, characterized in that: Here are the steps: S1, working shaft construction; according to the plane layout position of the entrance and exit passage to be excavated, a vertical shaft working shaft (100) is constructed at a suitable position around the proposed entrance and exit passage, and the vertical shaft working shaft (100) is arranged at both ends of the proposed dark excavation construction passage section to form a starting shaft and a receiving shaft; a grouting reinforcement area (1001), a backing structure (1002), and a temporary support member (1003) are set in the vertical shaft working shaft (100); S2, complete the installation and commissioning of mobile support devices and excavation equipment in the starting well; S3, initial excavation; breaking the starting side wall (1004) within the shield range of the double-layer sleeve mechanism (2), then excavating the soil corresponding to the area and transporting the slag under the support of the first internal sleeve (202), after excavation to the designed advance, using the front jacking drive (102) to push the internal sleeve (202), the jacking distance being the same as the excavation advance; then, synchronously step-wise excavation of the corresponding soil is performed under the support of the first internal sleeve (202) and the second internal sleeve (202), after excavation to the designed advance, the first internal sleeve (202) and the second internal sleeve (202) are pushed simultaneously, the jacking distance being the same as the excavation advance; and so on, completing the initial excavation of N internal sleeves (202); S4, continuous excavation; after the initial excavation is completed, the outer sleeve (201) is pushed by the outer pushing driving member (101), and a pipe segment or a supporting structure is assembled at the tail of the outer sleeve (201); then the soil in the corresponding areas of the N inner sleeves (202) is excavated simultaneously, and the synchronous step-by-step excavation state is maintained until the tunnel is broken through; S5, receiving by tunnel boring machine: completing the receiving of mobile support device and excavation equipment in the receiving well.

10. The tunnel construction method using the mobile support device for tunnel construction according to claim 9, characterized in that: In step S3, when the internal sleeve (202) is pushed in, if the oil cylinder stroke of the front push driving member (102) is insufficient, a movable rotating shim (3) is used to turn its shim from a vertical state to a horizontal state and install it to the end of the cylinder to increase the push stroke, so that the N internal sleeves (202) form a stepped excavation state.

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