Mobile support device for tunnel construction and tunnel construction method

Abstract

The present invention discloses 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 blind excavation construction in the prior art. The mobile support device for tunnel construction of the present invention includes 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. The equipment used in the present invention is simple, efficient, and low-cost; at the same time, excavation equipment can be flexibly selected according to actual conditions, and the excavation equipment has good reusability; it is conducive to large-scale engineering applications.

Description

Technical Field

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

[0002] Currently, underground excavation construction primarily utilizes traditional mining methods and mechanical methods. However, traditional mining methods for large-scale underground projects have inherent drawbacks, including complex support procedures, long construction periods, poor working environments, and significant material waste. Mechanical excavation, on the other hand, primarily involves the use of equipment such as pipe jacking machines, shield machines, and TBMs. These methods utilize high-precision equipment with high original value and low reusability, resulting in high costs for individual projects. This has prevented the widespread adoption of mechanical methods.

[0003] In recent years, with the development of science and technology, there have been a variety of improved technical studies for mining methods and mechanical methods, such as those recorded in Chinese patents with publication numbers CN105781595A, CN 114607397 A and CN213898973U. These methods divide and combine sections, which is an improvement on the mechanical underground excavation method. However, their essence is still a combination of multiple high-precision tunneling equipment, and they do not solve the problems of high price and low applicability. In addition, there are improved technologies for traditional mining methods, such as the patent with publication number CN114790896A, which is essentially an improved method for mining methods. During the construction process, it is still necessary to first do initial support and then do secondary structure. It does not solve the problems of the mining method with complicated procedures, long construction period, poor working environment and large waste of materials. 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 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 includes a double-layer sleeve mechanism and a pushing mechanism for providing jacking of the double-layer sleeve mechanism; the pushing mechanism includes an outer pushing drive member and an inner pushing drive member; the double-layer sleeve mechanism includes an outer sleeve and N inner sleeves, N ≥ 2; the inner sleeve corresponds to the inner pushing drive member, the outer pushing drive member corresponds to the outer sleeve, and adjacent inner sleeves, between the inner sleeve and the outer sleeve, and between the outer sleeve and the tunnel can move relative to each other under the action of the pushing 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 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 several outer pushing cylinders; the outer pushing cylinders are evenly distributed along the rear end face of the grid-type bracket; the internal pushing drive component includes several inner pushing cylinders, and the inner pushing cylinders are evenly distributed along the front end face of the grid-type bracket.

[0008] It is further preferred that 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. The directional sliding mechanism comprises a matching rail groove and a slide rail, wherein the rail 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 rotary pads used in conjunction with the jacking mechanism; the movable rotary pads are detachably mounted on the inner wall of the outer sleeve and can move with the inner sleeve. The movable rotary pads are used

[0011] Further preferably, the movable rotatable washer includes a pad, a moving block is provided in the middle of the pad for rotation, 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 via a traction member. Specifically, the moving block is in sliding or rolling cooperation with the slide groove. When the moving block is in sliding cooperation with the slide groove, the moving block is located in the slide groove and is in sliding cooperation with the slide groove; when the moving block is in rolling cooperation with the slide groove, a roller is provided on the moving block that is in cooperation with the slide groove; the moving block is in rotation cooperation with the through hole in the center of the pad via a central rotating shaft, and the pad is limited on the central rotating shaft by a nut member that is threadedly engaged with the central rotating shaft.

[0012] A tunnel construction method based on the mobile support device for tunnel construction comprises the following steps:

[0013] 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 underground 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.

[0014] S2, complete the installation and commissioning of mobile support devices and excavation equipment in the starting well.

[0015] S3, carry out 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 corresponding soil in the area and transport out the debris. After excavation reaches the designed advance, use the internal sleeve to push the driving part, and the pushing distance is the same as the excavation advance; then, with the support of the first internal sleeve and the second internal sleeve, carry out synchronous step-by-step excavation of the corresponding soil. After excavation reaches 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.

[0016] In step S3, when pushing the inner sleeve, if the cylinder stroke of the front pushing drive component is insufficient, a movable rotating shim is used to rotate its pad 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.

[0017] 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, maintaining a synchronous step-by-step excavation state until the tunnel is broken through.

[0018] S5, receiving the tunnel boring machine; completing the receiving of the mobile support device and excavation equipment in the receiving well.

[0019] 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 pushing mechanism for providing jacking of the double-layer sleeve mechanism to carry out mechanized stepped 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-cost; at the same time, the excavation equipment can be flexibly selected according to actual conditions, and the tunneling equipment has good reusability; it is conducive to large-scale engineering applications.

[0020] 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. The surrounding rock and the face can remain stable under the support of the internal sleeve without collapse and instability, which greatly improves 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

[0021] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the internal structure of the mobile support device of the present invention;

[0023] Figure 2 It is a side view schematic diagram of the internal structure of the mobile support device of the present invention;

[0024] Figure 3 It is a schematic diagram of the grid-type bracket in the pushing mechanism;

[0025] Figure 4 It is a schematic diagram of the movable rotating washer in a vertical state;

[0026] Figure 5 It is a schematic diagram of the movable rotating pad in a horizontal state;

[0027] Figure 6 This is a plan view of the working well used in the present invention;

[0028] Figure 7 This is a schematic diagram of the initial excavation of the first inner sleeve;

[0029] Figure 8 This is a schematic diagram of the initial excavation of the first inner sleeve;

[0030] Figure 9 This is a schematic diagram of the initial excavation of the second inner sleeve;

[0031] Figure 10 This is a schematic diagram of the interior of the initial excavation of the second inner sleeve;

[0032] Figure 11 This is a schematic diagram of the initial excavation of the third inner sleeve;

[0033] Figure 12 This is a schematic diagram of the initial excavation of the third inner sleeve;

[0034] Figure 13 This is a schematic diagram of the initial excavation of the fourth inner sleeve;

[0035] Figure 14 This is a schematic diagram of the interior of the initial excavation of the fourth inner sleeve;

[0036] Figure 15 This is a schematic diagram of continuous excavation according to the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0038] Example 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 for the double-layer sleeve mechanism 2. The double-layer sleeve mechanism 2 cooperates with the stepped construction so that each operation process is carried out under the protection of the retaining sleeve, which makes the construction safe and efficient. The permanent structure can be cast in place or prefabricated according to actual needs, and is flexible in application. In this embodiment, the jacking mechanism 1 includes an outer jacking drive 101 and an inner jacking drive 102, which correspond to the outer sleeve 201 and inner sleeve 202 of the double-layer sleeve mechanism, so that the outer sleeve 201 and the inner sleeve 202 can perform a pushing action respectively. The double-layer sleeve mechanism 2 described in this embodiment includes an outer sleeve 201 and N inner sleeves 202, where N ≥ 2. The cross-section of the outer sleeve is basically consistent with the planned excavation cross-section. The inner sleeve is divided into several 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 several small sleeves. The inner sleeve 202 corresponds to the inner jacking drive 102, while the outer jacking drive 101 corresponds to the outer sleeve 201. The inner jacking drive 102 pushes the inner sleeve 202, while the outer jacking drive 101 pushes the outer sleeve 201. The jacking mechanism 1 enables relative movement between adjacent inner sleeves 202, between an inner sleeve 202 and outer sleeve 201, and between the outer sleeve 201 and the tunnel. In other words, both the inner sleeve 202 and outer sleeve 201 can independently move, enabling stepped excavation.

[0039] like Figure 2 As shown, the pushing mechanism 1 described in this embodiment also includes a grid-type 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-type support 103 correspond to the outer sleeve 201 and the N inner sleeves 202 respectively; that is, the outermost ring grid of the grid-type 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-type support 103 and is located on the outermost ring grid. This outer layer pushing drive can push on the assembled pipe segment 4, providing it with power to push the outer sleeve. The inner pushing drive 102 is arranged on the front end face of the grid-type support 103 and is located on the inner grid, and is used to push the corresponding inner sleeve.

[0040] The outer thrust drive 101 described in this embodiment includes a plurality of outer thrust cylinders, which are evenly distributed along the rear end face of the lattice support 103 and ensure that the outer thrust cylinders can act on the end face of the outer sleeve wall. The inner thrust drive 102 includes a plurality of inner thrust cylinders, which are evenly distributed along the front end face of the lattice support 103 and ensure that the inner thrust cylinders can act on the end face of the inner sleeve wall. The cylinders are arranged in zones. For the outer and inner sleeves arranged in zones, the cylinders whose thrust direction is consistent with the tunneling direction are the inner thrust cylinders, providing thrust for the inner sleeve; the cylinders whose thrust direction is opposite to the tunneling direction are the outer thrust cylinders, providing thrust for the outer sleeve.

[0041] In this embodiment, N inner sleeves 202 are arranged side by side within outer sleeve 201, dividing the interior of outer sleeve 201 into N enclosed areas. The cross-sectional structure formed by the N inner sleeves 202 is consistent with the internal cross-sectional structure of outer sleeve 201, ensuring that the excavation equipment excavates the soil corresponding to the outer sleeve without blind spots, achieving full cross-sectional excavation.

[0042] Traditional shield equipment requires multiple supporting trolleys, which take up a lot of space when starting as a whole and complicate the construction process when starting in separate sections, resulting in low efficiency. However, the support device described in the present invention simplifies the equipment structure, reduces the number of supporting trolleys, and makes starting and receiving operations more flexible.

[0043] Example 2, a tunnel construction method based on the mobile support device for tunnel construction described in Example 1, comprising the following steps:

[0044] S1, Working Shaft Construction: Based on the planar layout of the planned entrance and exit tunnels, vertical working shafts 100 are constructed at appropriate locations around the proposed entrance and exit tunnels. Vertical working shafts 100 are located at both ends of the planned tunnel section, forming the launch and receiving shafts. Grouting reinforcement areas 1001, backrest structures 1002, and temporary support structures 1003 are installed in vertical working shafts 100. Before construction, the dimensions and shapes of the outer and inner sleeves are fitted based on the tunnel cross-section and the sub-excavation areas.

[0045] S2, complete the installation and commissioning of mobile support devices and excavation equipment in the starting well.

[0046] 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 debris out. After excavation reaches the designed advance, use the upper push drive member 102 to push the internal sleeve 202, and the pushing distance is the same as the excavation advance; then, under the support of the first internal sleeve 202 and the second internal sleeve 202, perform synchronous step-by-step excavation of the corresponding soil. After excavation reaches 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.

[0047] S4, continue excavation; after the initial excavation is completed, the outer sleeve 201 is pushed by the outer pushing drive 101, and the pipe segment or support structure is assembled at the tail of the outer sleeve 201; then continue to excavate the soil in the corresponding areas of N inner sleeves 202 at the same time, maintaining a synchronous step-by-step excavation state until the tunnel is broken through.

[0048] S5, receiving the tunnel boring machine; completing the receiving of the mobile support device and excavation equipment in the receiving well.

[0049] Compared with the mining method, the above-mentioned construction method of the present invention does not require initial support, eliminating 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 is 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.

[0050] Example 3, a mobile support device for tunnel construction, is a further improvement on Example 1. In this embodiment, a directional sliding mechanism is provided between adjacent inner sleeves 202 and between an inner sleeve 202 and an outer sleeve 201. That is, each inner sleeve and the inner sleeve and the outer sleeve can slide, ensuring support stability. In this embodiment, the directional sliding mechanism preferably includes a matching rail groove 203 and a slide rail 204. The rail groove 203 and / or slide rail 204 are provided on the inner wall of the outer sleeve 201 and the outer wall of the corresponding inner sleeve 202 along the direction of tunnel excavation. For the outer sleeve, if the inner wall is provided with an axial rail groove, the outer wall of the corresponding inner sleeve is provided with a slide rail, enabling stable sliding of the inner sleeve relative to the outer sleeve. For the inner sleeve, if the outer wall is provided with an axial rail groove, the outer walls of adjacent inner sleeves are provided with slide rails, enabling stable sliding between adjacent inner sleeves.

[0051] In this embodiment, the mobile support device for tunnel construction also includes a number of movable rotating shims 3 used in conjunction with the pushing mechanism 1; the movable rotating shims 3 are detachably arranged on the inner wall of the outer sleeve 201 and can move with the inner sleeve 202; the movable rotating shims move with the inner sleeve 202, and when the inner propulsion cylinder of the internal pushing drive 102 has insufficient cylinder stroke during the pushing process of the inner sleeve, the movable rotating shims 3 are placed between the inner sleeve and the inner propulsion cylinder to ensure continuous pushing of the inner sleeve.

[0052] Specifically, if Figure 4 、 5 As shown, the movable rotatable shim 3 comprises a pad 301. A movable block 302 is pivotally mounted in the middle of the pad 301. The movable block 302 engages a chute 304 provided on the inner wall of the outer sleeve 201. The movable block 302 moves along the chute, driving the pad. The chute is arranged axially along the outer sleeve. The pad can be a long rectangular block to increase its effective length. Locking catches 303 are provided at each end of the pad 301. When not in use, the pad is held in a vertical position, minimizing space. When needed, the pad can be removed and secured horizontally between the cylinder and the inner sleeve using the locking catches, increasing the cylinder's thrust stroke. The pad 301 moves with the inner sleeve 202 via a traction member, such as a steel wire rope. The traction member moves with the inner sleeve, allowing for easy and convenient removal when increased thrust stroke is required. In this embodiment, the movable block 302 engages with the chute 304 in a sliding or rolling manner. Multiple moving blocks can be connected in series in a chute to accommodate cylinders with different strokes. It should be noted that when the moving block 302 slides with the chute 304, the moving block 302 is located in the chute 304 and slides with the chute 304; when the moving block 302 rolls with the chute 304, the moving block 302 is provided with a roller that matches the chute 304. The moving block 302 rotates with the through hole in the center of the pad 301 through the central rotating shaft 305; to facilitate the change of the pad state, the pad 301 is limited on the central rotating shaft 305 by a nut that is threadedly engaged with the central rotating shaft 305; the pad can be flexibly disassembled and assembled. When the cylinder stroke is insufficient, the shim is rotated to increase its length and assist in pushing the inner sleeve into place.

[0053] Example 4: In this example, N=4 is used as an example, i.e., the double-layer sleeve mechanism 2 has one outer sleeve 201 and four inner sleeves 202; the entire cross section is divided into four parts; based on the tunnel construction method of the mobile support device for tunnel construction described above, a mechanized step method is adopted for construction, and the entire cross section is divided into four parts as an example, which is divided into initial excavation and continuous excavation; the specific steps are as follows:

[0054] 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 construct a vertical shaft working shaft 100, and the vertical shaft working shaft 100 is arranged at both ends of the proposed underground 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; the working shaft is only a starting and receiving space for the excavation equipment. For example, if the existing underground space, such as the existing station main structure, the existing tunnel, the existing basement, etc., or the platform size meets the starting and receiving requirements, a separate working shaft may not be set.

[0055] S2, complete the installation and commissioning of the mobile support device and excavation equipment in the starting shaft; this embodiment uses a small cantilever tunnel boring machine for excavation operations, and various tunnel boring machines such as excavators and crushers can be flexibly selected on site according to actual conditions.

[0056] 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 inner sleeve 202, excavate the soil corresponding to the area and transport the slag. 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 a stepped manner 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. The pushing distance is the same as the excavation footage, as shown in FIG. Figure 9 、 10 Similarly, the first, second and third inner sleeves 202 are excavated synchronously in steps, as shown. Figure 11 、 12 Then, the first, second, third, and fourth internal sleeves 202 are excavated synchronously in steps, as shown. Figure 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.

[0057] In step S3, when pushing the inner sleeve 202, if the cylinder stroke of the front pushing drive member 102 is insufficient, a movable rotating pad 3 is used to rotate its pad 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 202 form a stepped excavation state.

[0058] S4, continuous excavation; Figure 15As shown, after initial excavation is completed, the outer sleeve 201 is pushed forward using the outer push-driving element 101, and segments or support structures are assembled at the rear of the outer sleeve 201. This embodiment uses a prefabricated assembly solution, but a cast-in-place solution using a formwork trolley can also be used. The specific implementation can be flexibly adjusted according to actual conditions. Excavation of the soil corresponding to the four inner sleeves 202 is then continued simultaneously, maintaining a synchronized, stepped excavation process until the tunnel is broken through.

[0059] S5, TBM Receiving: The mobile support device and excavation equipment are received in the receiving well. If the construction site does not have the conditions for a receiving well, the outer large shield can be discarded and the inner small shield can be disassembled and transported.

[0060] As described above, during the construction of the tunnel boring machine of the present invention, the jacking mechanism advances the inner sleeves one by one, while simultaneously completing the excavation of the soil in the area within the inner sleeves. During the excavation process, the steps are referred to, and the faces of the inner sleeves are kept a certain distance apart to ensure that the cross-section of the soil excavated in each step is small. The surrounding rock and the face can remain stable under the support of the inner sleeves without collapsing or becoming unstable. After completing one excavation cycle, assembly or pouring operations are carried out under the support of the rear outer sleeve to complete the construction of the permanent structure. The next cycle of construction operations is then carried out in sequence until the entire underground project is connected, and the excavation equipment is disassembled and transported out. Therefore, according to the present invention, safe excavation of large-section underground structures can be achieved without the need for initial support, resulting in a simple and efficient process. At the same time, due to its simple equipment, the excavation and slag removal systems can be flexibly selected according to actual conditions. The original equipment cost is relatively low, which is conducive to large-scale promotion and application.

[0061] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mobile support device for tunnel construction, characterized by: The invention comprises a double-layer sleeve mechanism (2) and a pushing mechanism (1) for providing pushing of the double-layer sleeve mechanism (2); the pushing mechanism (1) comprises an outer pushing driving member (101) and an inner pushing driving member (102); the double-layer sleeve mechanism (2) comprises an outer sleeve (201) and N inner sleeves (202), N ≥ 2; the inner sleeves (202) correspond to the inner pushing driving member (102), the outer pushing driving member (101) corresponds to the outer sleeve (201), and adjacent inner sleeves (202), the inner sleeves (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 pushing mechanism (1); 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 face of the grid-type support (103), and the inner pushing drive member (102) is arranged on the front end face of the grid-type support (103); 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.

2. The mobile support device for tunnel construction according to claim 1, characterized in that: The outer layer thrust driving member (101) includes 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) includes a plurality of inner layer thrust cylinders, which are evenly arranged along 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: 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.

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

5. The mobile support device for tunnel construction according to claim 4, characterized in that: The movable rotary 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.

6. The mobile support device for tunnel construction according to claim 5, characterized in that: The moving block (302) is rotatably engaged with the through hole in 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 engaged with the central rotating shaft (305).

7. A tunnel construction method based on the mobile support device for tunnel construction according to claim 1 or 6, characterized in that: Here are the steps: S1, construction of a working shaft; according to the planar layout of the entrance and exit passage to be excavated, a suitable location is selected around the proposed entrance and exit passage to construct a vertical shaft working shaft (100); the vertical shaft working shaft (100) is arranged at both ends of the proposed underground 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 the mobile support device and excavation equipment in the launch shaft; S3, perform initial excavation; break the starting side wall (1004) within the shield range of the double-layer sleeve mechanism (2), then excavate the soil corresponding to the area and transport the slag under the support of the first internal sleeve (202), after excavation reaches the designed advance, use the internal jacking drive (102) to push the internal sleeve (202), the jacking 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 excavation reaches the designed advance, push the first internal sleeve (202) and the second internal sleeve (202) at the same time, the jacking distance is the same as the excavation advance; and so on, complete 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 the pipe segment or support structure is assembled at the tail of the outer sleeve (201); then the soil corresponding to 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 the tunnel boring machine; completing the receiving of the mobile support device and excavation equipment in the receiving well.

8. The tunnel construction method using the mobile support device for tunnel construction according to claim 7, characterized in that: In step S3, when the internal sleeve (202) is pushed in, if the oil cylinder stroke of the internal pushing drive member (102) is insufficient, a movable rotating pad (3) is used to rotate its pad from a vertical state to a horizontal state and install it to the end of the oil cylinder to increase the pushing stroke, so that the N internal sleeves (202) form a stepped excavation state.

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