Guide table mechanism for assisting installation of TBM (Tunnel Boring Machine)

Abstract

The utility model provides a guide table mechanism assisting in TBM installation. The guide table mechanism comprises a guide table structure and an inverted arch structure. The guide table structure comprises a foundation pit arranged at a tunnel portal, an arc-shaped guide table arranged in the foundation pit, a first guide rail and a second guide rail, wherein the first guide rail and the second guide rail are longitudinally arranged on the arc-shaped guide table; the longitudinal section of the arc-shaped guide table is arc-shaped, and the radius of the arc is equal to the radius of the outer contour line of the TBM equipment; the first guide rail and the second guide rail are symmetrically distributed on the table top of the arc-shaped guide table with the center line of the tunnel portal as the symmetric line. The inverted arch structure is fixedly arranged on the table surface of the arc-shaped guide table; the side face of the inverted arch structure abuts against the extending end of an auxiliary pushing oil cylinder of the TBM equipment. According to the utility model, the problems in the prior art that enough space is needed for assembling TBM equipment at a tunnel portal, the equipment is difficult to assemble in a scene with a limited field at the tunnel portal, and certain potential construction safety hazards exist in a mode that the equipment is moved by supporting a tunnel wall by using a supporting shoe can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of TBM excavation engineering, and more specifically to a guide platform mechanism for assisting TBM installation. Background Art

[0002] When a TBM (Tunnel Boring Machine) enters a tunnel, it is necessary to install the equipment. During the installation of the TBM, the conventional assembly method is to assemble it at the tunnel entrance, support the tunnel wall with the support boots of the equipment to withstand the reaction force on the tunnel wall to move the equipment, thereby moving multiple parts of the TBM equipment to the designated location for assembly.

[0003] At present, the above-mentioned TBM assembly method usually requires sufficient space for the assembly of TBM equipment. However, for scenarios with limited space at the tunnel entrance, it may not be able to accommodate the entire equipment assembly, which brings certain difficulties to the assembly of TBM equipment. In addition, for relatively broken surrounding rocks, the tunnel wall is supported by the support boots of the equipment to enable the equipment to move, which may easily cause problems such as rock falling and affecting construction safety. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a guide platform mechanism for assisting the installation of TBM, so as to solve the problems in the prior art that sufficient space is required to assemble TBM equipment at the tunnel entrance, equipment assembly is difficult in scenarios where the space at the tunnel entrance is limited, and the method of using support boots to support the tunnel wall to enable the equipment to move has certain construction safety hazards.

[0005] The utility model provides a guide platform mechanism for assisting TBM installation, comprising a guide platform structure and an inverted arch structure; wherein the guide platform structure comprises a foundation pit arranged at a tunnel entrance, an arc-shaped guide platform arranged in the foundation pit, and a first guide rail and a second guide rail longitudinally arranged on the arc-shaped guide platform; wherein the foundation pit is arranged along the propulsion direction of the TBM equipment into the tunnel chamber, and the length of the foundation pit is greater than the distance from the cutter head to the rear support of the TBM equipment; the longitudinal section of the arc-shaped guide platform is arc-shaped, and the radius of the arc is equal to the radius of the outer contour line of the TBM equipment; the first guide rail and the second guide rail are symmetrically distributed on the surface of the arc-shaped guide platform with the center line of the tunnel entrance as the symmetry line; the inverted arch structure is fixed on the surface of the arc-shaped guide platform; the side surface of the inverted arch structure abuts against the extended end of the auxiliary thrust cylinder of the TBM equipment.

[0006] In addition, a preferred structure is that the total length of the arc-shaped guide platform is the same as the equipment length of the TBM equipment that allows excavation conditions.

[0007] In addition, a preferred structure is that the longitudinal end of the arc-shaped guide platform is butted against the starting end of the excavation construction in the tunnel chamber.

[0008] In addition, a preferred structure is that the arc-shaped guide platform is made of cast concrete.

[0009] In addition, a preferred structure is that a backfill material layer is provided between the foundation pit and the outer side wall of the arc-shaped guide platform.

[0010] In addition, a preferred structure is that both the first guide rail and the second guide rail are steel rails.

[0011] In addition, a preferred structure is that the angle between the line connecting the first guide rail and the center of the tunnel opening and the line connecting the second guide rail and the center of the tunnel opening is 66°.

[0012] In addition, a preferred structure is that the top end of the first guide rail exposes 2 cm of the surface of the arc-shaped guide platform; and the top end of the second guide rail exposes 2 cm of the surface of the arc-shaped guide platform.

[0013] In addition, a preferred structure is that the lower ends of the first guide rail and the second guide rail are both buried inside the arc-shaped guide platform.

[0014] In addition, a preferred structure is that the inverted arch structure is located in the middle of the table top of the arc-shaped guide platform; the inverted arch structure includes a steel pipe base buried inside the arc-shaped guide platform and an inverted arch block fixedly installed on the top of the steel pipe base; the side surface of the inverted arch block abuts against the protruding end of the auxiliary thrust cylinder of the TBM equipment; and a water flow hole is longitudinally arranged on the inverted arch block.

[0015] It can be seen from the above technical scheme that the guide platform mechanism for assisting the installation of the TBM provided by the utility model, by setting a guide platform structure at the tunnel entrance site, using the first guide rail and the second guide rail to reduce the friction generated by the movement of the segmented TBM equipment, and using the invert arch structure to provide a propulsion reaction force for the stepping of the spliced ​​TBM equipment, effectively solves the problem of insufficient surrounding rock strength and greatly improves its overall stability and safety; the TBM equipment is assembled in sections, and the assembled parts are gradually pushed into the cavern of the starting tunnel to complete the installation of the TBM equipment in a limited space, effectively solving the problems of difficulty in assembling equipment in the existing technology in scenarios with limited tunnel entrance sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other purposes and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0017] Figure 1It is a structural schematic diagram of a guide platform mechanism for assisting TBM installation according to an embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a longitudinal section of an arc-shaped guide platform according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the top view of the arc-shaped guide platform according to an embodiment of the utility model;

[0020] Figure 4 It is a side view structural schematic diagram of the arc-shaped guide platform according to an embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of an invert block according to an embodiment of the utility model.

[0022] In the attached drawings, 1-arc guide platform, 2-first guide rail, 3-second guide rail, 4-outer contour line of TBM equipment, 5-center line of tunnel opening, 6-backfill layer, 7-steel pipe base, 8-inverted arch block, 9-water flow hole.

[0023] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0024] In response to the above-mentioned issues, in the prior art, sufficient space is required to assemble TBM equipment at the tunnel entrance. In scenarios where the tunnel entrance has limited space, equipment assembly is difficult, and the method of using support boots to support the tunnel wall to move the equipment has certain construction safety hazards. A guide platform mechanism for assisting the installation of TBM is proposed.

[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] In order to illustrate the guide platform mechanism for assisting TBM installation provided by the utility model, Figure 1 The structure of the guide platform mechanism for assisting TBM installation according to an embodiment of the utility model is shown; Figure 2 The structure of the longitudinal section of the arc-shaped guide platform according to the embodiment of the utility model is shown; Figure 3 The top view structure of the arc-shaped guide platform according to the embodiment of the utility model is shown; Figure 4 The side view structure of the arc-shaped guide platform according to the embodiment of the utility model is shown; Figure 5 The structure of the invert block according to the embodiment of the utility model is shown.

[0027] like Figures 1 to 5As shown together, the guide platform mechanism for assisting TBM installation provided by the utility model includes: a guide platform structure and an inverted arch structure; wherein, the guide platform structure includes a foundation pit arranged at the tunnel entrance, an arc-shaped guide platform 1 arranged in the foundation pit, a first guide rail 2 and a second guide rail 3 longitudinally arranged on the arc-shaped guide platform 1; wherein, the foundation pit is arranged along the pushing direction of the TBM equipment into the tunnel chamber, and the length of the foundation pit is greater than the distance from the cutter head of the TBM equipment to the rear support; the longitudinal section of the arc-shaped guide platform 1 is arc-shaped, and the radius of the arc is equal to the radius of the outer contour line 4 of the TBM equipment; the first guide rail 2 and the second guide rail 3 are symmetrically distributed on the table surface of the arc-shaped guide platform 1 with the center line 5 of the tunnel entrance as the symmetry line; the inverted arch structure is fixed on the table surface of the arc-shaped guide platform 1; the side surface of the inverted arch structure abuts against the extended end of the auxiliary thrust cylinder of the TBM equipment.

[0028] The guide platform structure is set at the assembly site of the TBM equipment at the tunnel entrance (it can be set inside or outside the entrance as needed). Instead of the traditional stepping assembly, the auxiliary thrust cylinder is installed at the rear of each TBM equipment to be assembled, and the assembly block of the TBM equipment is moved to the tunnel chamber on the first guide rail 2 and the second guide rail 3 by the backward thrust of the cylinder. Multiple TBM equipment are located on the table of the same arc guide platform 1, and are assembled in parts on the arc guide platform 1 to improve the installation efficiency. The arc guide platform 1 is set on the ground of the equipment advancement route, and the length of the foundation pit is greater than the distance from the cutter head of the TBM equipment to the rear support; the longitudinal length of the arc guide platform 1 is basically consistent with the normal excavation size of the TBM equipment. In the form of "arc guide platform + auxiliary thrust system (auxiliary thrust cylinder)", the TBM equipment is pushed in blocks to enter the excavation construction section of the tunnel chamber directly after assembly.

[0029] The propulsion measures of this structure are to set the first guide rail 2 and the second guide rail 3 on the arc guide platform 1, and use the auxiliary thrust cylinder to press the prefabricated inverted arch structure (the first inverted arch bottom block presses against the concrete surface at the end of the arc guide platform) to provide reaction force for the TBM equipment to step. After stepping to the appropriate position, the inverted arch block (located on the upper part of the inverted arch bottom block) is installed. The guide rail is to reduce the friction between the TBM head and the arc guide platform 1. The auxiliary thrust system (auxiliary thrust cylinder) is supported on the side of the inverted arch block to provide propulsion reaction force for the TBM equipment to step. The top elevation of the arc guide platform 1 is consistent with the top elevation of the inverted arch block 8, which is convenient for the installation of the conventional section inverted arch prefabricated block.

[0030] By setting up a guide platform structure at the tunnel entrance, using the first guide rail 2 and the second guide rail 3 to reduce the friction generated by the movement of the segmented TBM equipment, and using the invert structure to provide a propulsion reaction force for the stepping of the spliced ​​TBM equipment, the problem of insufficient surrounding rock strength is effectively solved, and its overall stability and safety are greatly improved; the TBM equipment is assembled in sections, and the assembled parts are gradually pushed into the cavern of the starting tunnel to complete the installation of the TBM equipment in a limited space, which effectively solves the problem of difficulty in assembling equipment in the existing technology in scenarios with limited tunnel entrance sites.

[0031] As a preferred solution of the utility model, the total length of the arc guide platform 1 is the same as the equipment length of the TBM equipment that allows the excavation condition, so that the TBM equipment of the corresponding length can be assembled according to the excavation length.

[0032] As a preferred solution of the utility model, the longitudinal end of the arc-shaped guide platform 1 is butted against the starting end of the tunneling construction in the tunnel chamber, so as to facilitate the assembled TBM equipment to be directly and quickly put into the tunneling construction.

[0033] As a preferred solution of the utility model, the arc-shaped guide platform 1 is made of concrete casting. It is preferably cast from C30 concrete, which has high strength, is strong and durable. For example, the guide platform structure is constructed from 27m in the small mileage direction of the guide tunnel and 215m in the tunnel. A foundation pit with a depth of 1.9m is excavated and filled with 0.3m of C30 concrete to form the arc-shaped guide platform 1. The chord height of the arc-shaped guide platform 1 is preferably 1.6m, and the radius is preferably the same as the outer contour line 4 of the TBM equipment, for example, preferably 4.4m, and the chord length is preferably 6.788m. A width of 50cm is left at both ends of the chord length to increase the firmness between the arc-shaped guide platform 1 and the ground. The width of the arc-shaped guide platform 1 is preferably 7.788m. Of course, the above-mentioned parameter data can be determined according to actual construction needs, and the utility model does not make any special restrictions on this.

[0034] As a preferred solution of the utility model, a backfill material layer 6 is provided between the foundation pit and the outer side wall of the arc-shaped guide platform 1 .

[0035] As a preferred solution of the present invention, the first guide rail 2 and the second guide rail 3 are both steel rails. Steel rails are strong and durable.

[0036] As a preferred solution of the present invention, the angle between the line connecting the first guide rail 2 and the center of the tunnel opening and the line connecting the second guide rail 3 and the center of the tunnel opening is 66°. This angle setting can further reduce the friction of the equipment movement.

[0037] As a preferred solution of the utility model, the top of the first guide rail 2 exposes 2 cm of the table surface of the arc-shaped guide platform 1; the top of the second guide rail 3 exposes 2 cm of the table surface of the arc-shaped guide platform 1, so that the equipment can slide on the guide rail.

[0038] As a preferred solution of the utility model, the lower ends of the first guide rail 2 and the second guide rail 3 are both buried inside the arc-shaped guide platform 1. This makes the guide rail installation more fixed and improves installation performance. The center distance between the first guide rail 2 and the second guide rail 3 is preferably 4793 mm.

[0039] As a preferred solution of the utility model, the inverted arch structure is located in the middle of the table surface of the arc-shaped guide platform 1; the inverted arch structure includes a steel pipe base 7 buried in the arc-shaped guide platform 1 and an inverted arch block 8 fixedly installed on the top of the steel pipe base 7; the side of the inverted arch block 8 abuts against the extended end of the auxiliary thrust cylinder of the TBM equipment; and a water flow hole 9 is longitudinally arranged on the inverted arch block 8. The steel pipe base 7 is used to fix the inverted arch block 8 on the arc-shaped guide platform 1, and the inverted arch block 8 provides a propulsion reaction force for the auxiliary thrust cylinder of the TBM equipment, so that the TBM equipment moves forward along the guide rail. The water flow hole 9 is arranged to facilitate the movement of water flow on both sides of the inverted arch block 8 in rainy days or watery environments.

[0040] The utility model has a simple structure and low investment cost. It only needs to utilize the guide rail sliding and the TBM auxiliary thrust system (auxiliary thrust cylinder) to push the arch block 8 back to provide propulsion reaction force for stepping. It is suitable for various terrain and geological conditions and various types of shield machine equipment. It only needs to make an arc guide platform that conforms to the shape of the TBM outer shell, and install the guide rail and the arch block. The traditional TBM is fixed by the friction between the support shoe and the rock wall. The strength of its surrounding rock directly determines the stability and safety performance. The arc guide platform adopts the setting of the arc guide platform, reduces the friction through the guide rail, and provides reaction force for the TBM stepping by installing the arch block, which effectively solves the problem of insufficient surrounding rock strength and greatly improves its overall stability and safety. The upper end of the arc guide platform can be flush with the ground, and with the help of the lower space, it can be used in the scene where the tunnel entrance is limited and the entire equipment cannot be assembled.

[0041] It can be seen from the above specific implementation methods that the guide platform mechanism for assisting TBM installation provided by the utility model, by setting a guide platform structure at the tunnel entrance site, using the first guide rail and the second guide rail to reduce the friction generated by the movement of the segmented TBM equipment, and using the invert arch structure to provide a propulsion reaction force for the stepping of the spliced ​​TBM equipment, effectively solves the problem of insufficient surrounding rock strength and greatly improves its overall stability and safety; the TBM equipment is assembled in sections, and the assembled parts are gradually pushed into the cavern of the starting tunnel to achieve the installation of the TBM equipment in a limited space, effectively solving the problems of equipment assembly difficulties in the existing technology for scenarios with limited tunnel entrance sites.

[0042] As described above, the guide mechanism for assisting TBM installation proposed by the utility model is described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the guide mechanism for assisting TBM installation proposed by the utility model without departing from the content of the utility model. Therefore, the protection scope of the utility model should be determined by the content of the attached claims.

Claims

1. A guide mechanism for assisting TBM installation, characterized in that: include: The guide platform structure and the invert arch structure; among them, The guide platform structure includes a foundation pit arranged at the tunnel entrance, an arc-shaped guide platform arranged in the foundation pit, and a first guide rail and a second guide rail longitudinally arranged on the arc-shaped guide platform; wherein, The foundation pit is arranged along the advancing direction of the TBM equipment into the tunnel chamber, and the length of the foundation pit is greater than the distance from the cutter head of the TBM equipment to the rear support; the longitudinal cross-section of the arc-shaped guide platform is arc-shaped, and the radius of the arc is equal to the radius of the outer contour line of the TBM equipment; the first guide rail and the second guide rail are symmetrically distributed on the surface of the arc-shaped guide platform with the center line of the tunnel opening as the symmetry line; The inverted arch structure is fixed on the table surface of the arc-shaped guide platform; the side surface of the inverted arch structure abuts against the extended end of the auxiliary thrust cylinder of the TBM equipment.

2. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The total length of the arc-shaped guide platform is the same as the equipment length of the TBM equipment that allows excavation conditions.

3. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The longitudinal end of the arc-shaped guide platform is butted against the starting end of the excavation construction in the tunnel chamber.

4. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The arc-shaped guide platform is made of concrete pouring.

5. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: A backfill material layer is arranged between the foundation pit and the outer side wall of the arc-shaped guide platform.

6. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The first guide rail and the second guide rail are both steel rails.

7. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The angle between the line connecting the first guide rail and the center of the tunnel opening and the line connecting the second guide rail and the center of the tunnel opening is 66°.

8. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The top of the first guide rail is exposed 2 cm above the surface of the arc-shaped guide platform; The top end of the second guide rail is exposed 2 cm from the surface of the arc-shaped guide platform.

9. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The lower ends of the first guide rail and the second guide rail are both buried inside the arc-shaped guide platform.

10. The guide platform mechanism for assisting TBM installation according to claim 1, characterized in that: The inverted arch structure is located in the middle of the table surface of the arc-shaped guide platform; the inverted arch structure includes a steel pipe base buried in the arc-shaped guide platform and an inverted arch block fixedly installed on the top of the steel pipe base; the side surface of the inverted arch block abuts against the protruding end of the auxiliary thrust cylinder of the TBM equipment; and a water flow hole is longitudinally arranged on the inverted arch block.

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