Cantilever excavation trolley suitable for tunnel weak surrounding rock full-section micro-step method

Abstract

The utility model discloses a cantilever excavation trolley suitable for a tunnel weak surrounding rock full-section micro-step method, which comprises a vertical installation truss arranged at the top of an excavation trolley body, and the vertical installation truss comprises a first vertical installation truss and a second vertical installation truss; a plurality of cantilever plates are arranged on the two sides of the excavation trolley body, and one end of each cantilever plate is fixedly connected with the outer side of the first vertical installation truss. One end of the first vertical mounting truss and one end of the second vertical mounting truss are arranged opposite to each step surface structure of the full-section micro-platform in the tunnel excavation direction; a movable platform structure capable of moving telescopically is arranged at the top end of the excavation trolley body, and a hydraulic supporting device is arranged at one end of the movable platform structure. The problems that when a conventional tunnel excavation trolley is used for tunnel weak surrounding rock full-section micro-step method construction, the excavation trolley cannot effectively meet the anti-overturning requirement, is complex and heavy in structure and does not have enough construction operation space, and consequently excavation work cannot be conveniently conducted by entering and exiting a tunnel face every time are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering, in particular to a cantilever excavation trolley suitable for a full-section micro-step method for soft surrounding rock in tunnels. Background Art

[0002] Traditional construction methods for large-section soft rock tunnels include double-sidewall pilot tunneling, CD, and CRD. These methods are slow, inefficient, and have limitations. However, the three-bench method, due to its advantages, has been widely used in recent years in the construction of single- and double-track railway passenger tunnels in Class IV-V surrounding rock. The three-bench excavation method involves first excavating the upper half of the section. Once excavated to a certain length, the middle section is then excavated. After the middle section has advanced a certain distance, the lower section is excavated. This process involves simultaneous excavation of the upper, middle, and lower sections. To accelerate tunnel construction and optimize the three-bench construction method, the full-section micro-bench method has been gradually adopted in engineering practice. Due to the improved cross-section stability after excavation, the upper bench can be kept within 5 meters of the middle bench. The excavation lengths of the middle and lower benches are controlled at approximately 3 to 5 meters. This method allows for simultaneous construction of the upper, middle, and lower benches, minimizing interference between related processes and saving tunnel excavation time.

[0003] Conventional tunnel excavation trolleys are no longer sufficient for this method. Especially for the upper steps, the cantilever length must be at least 8 meters to meet excavation requirements. Such a large cantilever prevents the trolley from effectively meeting the requirements for overturning resistance. Furthermore, its complex and bulky structure lacks sufficient working space, making it difficult to enter and exit the tunnel face for excavation work. Therefore, developing a cantilever excavation trolley suitable for the full-section micro-step method in tunnels with weak surrounding rock is particularly important. Summary of the Invention

[0004] The utility model provides a cantilever excavation trolley suitable for a full-section micro-step method of soft surrounding rock in a tunnel, so as to overcome the above technical problems.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A cantilever excavation trolley suitable for a full-section micro-step method for tunneling soft surrounding rock, comprising an excavation trolley body, a top of which is provided with a vertical mounting truss, the vertical mounting truss comprising a first vertical mounting truss and a second vertical mounting truss;

[0007] The first vertical mounting truss and the second vertical mounting truss are fixedly connected via a truss crossbeam and form an excavation trolley body together with the excavation trolley body;

[0008] A plurality of cantilever plates are provided on both sides of the excavation trolley body, and one end of the cantilever plate is fixedly connected to the outer side of the first vertical installation truss to form a plurality of layers of tunnel excavation platforms;

[0009] One end of the first vertical mounting truss and the second vertical mounting truss are arranged opposite to each step surface structure of the full-section micro-platform along the tunnel excavation direction, and the step surface of the full-section micro-platform includes a bottom face structure, a middle face structure and a top face structure;

[0010] A telescopically movable platform structure is provided on the top of the excavation trolley body, and a hydraulic support device is provided at one end of the movable platform structure.

[0011] Furthermore, the telescopically movable platform structure includes a first pulley motor group, a second pulley motor group and a fixed pulley;

[0012] One end of the vertical installation truss is provided with a mounting groove structure that is clamped with one end of the movable excavation platform, and the mounting groove structure is provided with a plurality of steel pin hole structures at equal intervals;

[0013] The first pulley motor group is fixedly arranged at the bottom end of the vertically mounted truss, and the fixed pulley is installed at the bottom of the other end of the movable excavation platform, and the fixed pulley is arranged opposite to the first pulley motor group;

[0014] The second pulley motor group is arranged on the bottom surface of the top tunnel face structure;

[0015] One end of the cable wound around the pulley of the first pulley motor group passes around the fixed pulley and is fixed to the housing of the first pulley motor group, and one end of the cable wound around the pulley of the second pulley motor group passes around the fixed pulley and is fixed to the housing of the second pulley motor group; and the rotation directions of the first pulley motor group and the second pulley motor group are opposite.

[0016] Furthermore, the second vertical truss is installed on the inner side of the first vertical truss through a truss crossbeam;

[0017] Furthermore, the plane where the top chord of the second vertical truss is located coincides with the plane where the top chord of the first vertical truss is located.

[0018] Furthermore, the tunnel excavation platform includes a bottom excavation platform and other excavation platforms located on the top of the bottom excavation platform;

[0019] The remaining excavation platforms include, from bottom to top, a second excavation platform, a third excavation platform, a fourth excavation platform, and a fifth excavation platform;

[0020] A hydraulic support device is provided at the bottom end of the bottom excavation platform;

[0021] The bottom ends of the excavation platforms of the remaining layers are all provided with platform support tilting rods connected to the first vertical installation trusses.

[0022] Furthermore, the second excavation platform is provided with a weight block for balancing the excavation trolley body.

[0023] Furthermore, guardrails are provided at the top of each excavation platform.

[0024] Furthermore, I-beams for laying steel grids are provided at the top ends of the corresponding chords of the first vertical installation trusses and the second vertical installation trusses connected to the third excavation platform, the fourth excavation platform and the fifth excavation platform.

[0025] Furthermore, walking wheels with a locking function are installed at the bottom of the excavation trolley body.

[0026] Beneficial effect: The utility model provides a cantilever excavation trolley suitable for the full-section micro-step method of soft surrounding rock in tunnels. The excavation trolley body is formed by arranging a vertical installation truss on the top of the excavation trolley body and fixing it with a truss crossbeam. Through the installation of the vertical installation truss and the truss crossbeam, the on-site construction operation is simple and the labor input is small. It is safe and reliable and can be disassembled and reused, while reducing the construction cost. A number of cantilever plates are provided on both sides of the excavation trolley body to obtain several layers of tunnel excavation platforms, so as to change the previous three-step scattered construction into centralized construction, which is beneficial to construction management and greatly improves construction efficiency and tunnel construction progress, saving working hours. A retractable and movable platform structure is provided on the top of the excavation trolley body to achieve retraction and extension along the tunnel excavation direction, which is highly practical and increases the working space of the construction personnel. A hydraulic support device is provided at one end of the movable platform structure to improve safety during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 This is a schematic structural diagram of a cantilever excavation trolley suitable for the full-section micro-step method for tunnels with soft surrounding rocks according to the utility model;

[0029] Figure 2 This is a schematic diagram of the front view of the cantilever excavation trolley in this embodiment;

[0030] Figure 3 This is a schematic rear view of the cantilever excavation trolley in this embodiment;

[0031] Figure 4 Schematic diagram of the telescopic movable platform structure in this embodiment.

[0032] In the figure: 1. Excavation trolley body; 2. Vertical installation truss; 21. First vertical installation truss; 22. Second vertical installation truss; 23. Truss crossbeam; 24. Mounting groove structure; 3. Cantilever plate; 4. Step surface of full-section micro-platform; 41. Bottom-layer tunnel face structure; 42. Middle-layer tunnel face structure; 43. Top-layer tunnel face structure; 5. Movable platform structure; 51. First pulley motor group; 52. Second pulley motor group; 53. Fixed pulley; 6. Hydraulic support device; 7. Platform support tilt rod; 8. Counterweight block; 9. Guardrail; 10. I-beam; 11. Travel wheel. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0034] This embodiment provides a cantilever excavation trolley suitable for the full-section micro-step method for tunneling soft surrounding rock, comprising an excavation trolley body 1, a vertical mounting truss 2 provided on the top of the excavation trolley body 1, and the vertical mounting truss 2 comprising a first vertical mounting truss 21 and a second vertical mounting truss 22;

[0035] The first vertical installation truss 21 and the second vertical installation truss 22 are fixedly connected by a truss cross beam 23. The second vertical installation truss 22 is installed on the inner side of the first vertical installation truss 21 through the truss cross beam 23. The plane where the top chord of the second vertical installation truss 22 is located coincides with the plane where the top chord of the first vertical installation truss 21 is located, and together with the excavation trolley body 1, the excavation trolley body is formed.

[0036] A plurality of cantilever plates 3 are provided on both sides of the excavation trolley body, and one end of the cantilever plate 3 is fixedly connected to the outer side of the first vertical mounting truss 21 to form a plurality of layers of tunnel excavation platforms;

[0037] One end of the first vertical mounting truss 21 and the second vertical mounting truss 22 are arranged opposite to each step surface 4 structure of the full-section micro-platform along the tunnel excavation direction, and the step surface 4 of the full-section micro-platform includes a bottom face structure 41, a middle face structure 42 and a top face structure 43;

[0038] A retractable and movable platform structure 5 is provided at the top of the excavation trolley body, and a hydraulic support device 6 is provided at one end of the movable platform structure 5, which is supported on the upper step ground during operation. The movable platform structure 5 is changed from a cantilever plate to a simply supported plate, ensuring the stability and safety of the structure.

[0039] This embodiment forms an excavation trolley body by providing a vertically mounted truss on the top of the excavation trolley body and fixing the truss cross beam to connect the truss cross beam. By installing the vertically mounted truss and the truss cross beam, on-site construction operation is simple and requires less labor, and it is safe, reliable, and can be disassembled and reused, while reducing construction costs. A number of cantilever plates are provided on both sides of the excavation trolley body to obtain several layers of tunnel excavation platforms, so that the previous three-step scattered construction is changed to centralized construction, which is beneficial to construction management and greatly improves construction efficiency and tunnel construction progress, saving working hours. A retractable and movable platform structure is provided on the top of the excavation trolley body to achieve retraction and extension along the tunnel excavation direction, which is highly practical and increases the working space of construction personnel, and a hydraulic support device is provided at one end of the movable platform structure to improve safety during construction.

[0040] In a specific embodiment, the telescopically movable platform structure 5 includes a first pulley motor group 51, a second pulley motor group 52 and a fixed pulley 53;

[0041] One end of the vertically mounted truss 2 is provided with a mounting groove structure 24 that is engaged with one end of the movable platform structure 5, wherein one end of the vertically mounted truss 2 and one end of the movable platform structure 5 can be inserted into each other by using large and small square steel pipes, and after being stretched into place, a steel pin is inserted to temporarily fix them; and the mounting groove structure 24 is provided with a plurality of steel pin holes at equal intervals; the first pulley motor group 51 is fixedly arranged at the bottom end of the vertically mounted truss 2, and the fixed pulley 53 is installed at the bottom of the other end of the movable platform structure 5, and the fixed pulley 53 is arranged opposite to the first pulley motor group 51;

[0042] The second pulley motor group 52 is arranged on the bottom surface of the top face structure 43;

[0043] One end of the cable wound around the pulley of the first pulley motor group 51 passes around the fixed pulley 53 and is fixed to the housing of the first pulley motor group 51, and one end of the cable wound around the pulley of the second pulley motor group 52 passes around the fixed pulley 53 and is fixed to the housing of the second pulley motor group 52; and the rotation directions of the first pulley motor group 51 and the second pulley motor group 52 are opposite.

[0044] In this embodiment, when the first pulley motor group 51 rotates forward, the cable connected to it is driven to be retracted, and then the movable platform structure 5 is driven by the fixed pulley to move along the installation groove structure 24 toward the first pulley motor group 51. At the same time, the second pulley motor group 52 is reversed, so that the cable connected to it is stretched, and the movable platform structure 5 is moved to one side through the fixed pulley and coordinated with the movable platform structure 5. After reaching the preset position, the first pulley motor group 51 and the second pulley motor group 52 are stopped, and the movable platform structure 5 is fixed to the installation groove structure 24 by the steel pin to improve the stability of the movable platform structure 5. When the unit 52 rotates forward, it drives the cable connected to it to be retracted, and then drives the movable platform structure 5 along the installation groove structure 24 through the fixed pulley to move away from the first pulley motor unit 51. At the same time, the first pulley motor unit 51 reverses, so that the cable connected to it is stretched, and the movable platform structure 5 moves to the other side through the fixed pulley. After reaching the preset position, the first pulley motor unit 51 and the second pulley motor unit 52 are stopped, and the movable platform structure 5 and the installation groove structure 24 are fixed by steel pins, thereby improving the stability of the movable platform structure 5 and realizing flexible adjustment of the working space of the construction personnel.

[0045] In a specific embodiment, the tunnel excavation platform includes a bottom excavation platform and other layers of excavation platforms located on the top of the bottom excavation platform; the other layers of excavation platforms include a second layer of excavation platform, a third layer of excavation platform, a fourth layer of excavation platform and a fifth layer of excavation platform in order from bottom to top;

[0046] The bottom end of the bottom excavation platform is provided with a hydraulic support device 6; since the bottom excavation platform cannot be provided with a diagonal brace in the height direction, it is equipped with a hydraulic support device, which is supported on the ground of the lower step during operation to ensure the safety of its cantilever structure;

[0047] The bottom ends of the remaining excavation platforms are all provided with platform support tilting rods 7 connected to the first vertical mounting trusses 21 to ensure the stability of the remaining excavation platforms and the safety of the construction workers.

[0048] In a specific embodiment, a weight block 8 for balancing the excavation trolley body is provided on the second excavation platform, thereby ensuring the overturning stability of the entire trolley during movement and operation.

[0049] In a specific embodiment, a guardrail 9 is provided at the top of each layer of the excavation platform to prevent construction workers from carelessly falling off the excavation platform and causing personal injury, thereby effectively improving the safety of construction operations.

[0050] In a specific embodiment, the top ends of the corresponding chords of the first vertical mounting trusses 21 and the second vertical mounting trusses 22 connected to the third excavation platform, the fourth excavation platform and the fifth excavation platform are provided with I-beams 10 for laying steel grid meshes, and the laid steel grid meshes are used for construction workers to use for drilling operation stations, thereby increasing additional construction working space.

[0051] In a specific embodiment, the bottom of the excavation trolley body 1 is equipped with a locking wheel 11. There are four running wheels at the bottom of the excavation trolley body 1. When the trolley reaches the designated position, the temporary locking device set on the running wheel works to prevent the trolley from moving forward and backward.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cantilever excavation trolley suitable for full-section micro-stepping method of soft surrounding rock in tunnels, characterized by: It comprises an excavation trolley body (1), the top of the excavation trolley body (1) is provided with a vertical installation truss (2), and the vertical installation truss (2) comprises a first vertical installation truss (21) and a second vertical installation truss (22); The first vertical installation truss (21) and the second vertical installation truss (22) are fixedly connected via a truss crossbeam (23), and together with the excavation trolley body (1) form an excavation trolley main body; A plurality of cantilever plates (3) are provided on both sides of the excavation trolley body, and one end of the cantilever plate (3) is fixedly connected to the outer side of the first vertical installation truss (21) to form a plurality of layers of tunnel excavation platforms; One end of the first vertical mounting truss (21) and the second vertical mounting truss (22) are arranged opposite to each step surface (4) structure of the full-section micro-platform along the tunnel excavation direction, and the step surface (4) of the full-section micro-platform includes a bottom face structure (41), a middle face structure (42), and a top face structure (43); A telescopically movable platform structure (5) is provided at the top of the excavation trolley body, and a hydraulic support device (6) is provided at one end of the movable platform structure (5).

2. The cantilever excavation trolley suitable for the full-section micro-step method of soft surrounding rock in tunnels according to claim 1 is characterized in that: The telescopically movable platform structure (5) comprises a first pulley motor group (51), a second pulley motor group (52) and a fixed pulley (53); One end of the vertical installation truss (2) is provided with a mounting groove structure (24) that is clamped with one end of the movable platform structure (5), and the mounting groove structure (24) is provided with a plurality of steel pin holes at equal intervals; The first pulley motor group (51) is fixedly arranged at the bottom end of the vertical installation truss (2), the fixed pulley (53) is installed at the bottom of the other end of the movable platform structure (5), and the fixed pulley (53) is arranged opposite to the first pulley motor group (51); The second pulley motor group (52) is arranged on the bottom surface of the top face structure (43); One end of the cable wound around the pulley of the first pulley motor group (51) passes around the fixed pulley (53) and is fixed to the housing of the first pulley motor group (51); one end of the cable wound around the pulley of the second pulley motor group (52) passes around the fixed pulley (53) and is fixed to the housing of the second pulley motor group (52); and the first pulley motor group (51) and the second pulley motor group (52) rotate in opposite directions.

3. The cantilever excavation trolley suitable for the full-section micro-step method of tunnel soft surrounding rock according to claim 1 is characterized in that: The second vertical installation truss (22) is installed on the inner side of the first vertical installation truss (21) through a truss crossbeam (23); Furthermore, the plane where the top chord of the second vertical installation truss (22) is located coincides with the plane where the top chord of the first vertical installation truss (21) is located.

4. The cantilever excavation trolley suitable for the full-section micro-step method of tunnel soft surrounding rock according to claim 3 is characterized in that: The tunnel excavation platform includes a bottom excavation platform and other excavation platforms located on the top of the bottom excavation platform; The remaining excavation platforms include, from bottom to top, a second excavation platform, a third excavation platform, a fourth excavation platform, and a fifth excavation platform; A hydraulic support device (6) is provided at the bottom end of the bottom excavation platform; The bottom ends of the remaining excavation platforms are all provided with platform support tilting rods (7) connected to the first vertical installation truss (21).

5. The cantilever excavation trolley suitable for the full-section micro-step method of tunnel soft surrounding rock according to claim 4 is characterized in that: The second excavation platform is provided with a weight block (8) for balancing the excavation trolley body.

6. The cantilever excavation trolley suitable for full-section micro-step method of soft surrounding rock in tunnels according to claim 1, characterized in that: The top of each excavation platform is provided with a guardrail (9).

7. The cantilever excavation trolley suitable for full-section micro-stepping method of soft surrounding rock in tunnels according to claim 4, characterized in that: I-beams (10) for laying steel grids are provided at the top ends of corresponding chords of the first vertical installation trusses (21) and the second vertical installation trusses (22) connected to the third, fourth and fifth excavation platforms.

8. The cantilever excavation trolley suitable for full-section micro-stepping method of soft surrounding rock in tunnels according to claim 1, characterized in that: Travel wheels (11) with a locking function are installed at the bottom of the excavation trolley body (1).

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