Large-span multi-station tunnel trestle

Abstract

The invention relates to the technical field of tunnel construction, in particular to a large-span multi-station tunnel trestle which is arranged above a tunnel inverted arch in a spanning mode and comprises a front approach bridge, a main bridge and a rear approach bridge which are connected in sequence, walking wheels are arranged at the bottoms of the front approach bridge and the rear approach bridge, a telescopic supporting assembly and a movable walking assembly are arranged below the main bridge, and the main bridge is arranged above the front approach bridge. In the construction state, the supporting assembly is unfolded, and the walking assembly does not make contact with the ground; in the walking state, the supporting assembly is folded, and the walking assembly makes contact with the ground. The supporting assembly comprises a main support and a splayed support, and the walking assembly comprises a driving wheel train and an auxiliary wheel train. The trestle main bridge is long in span and small in downward deflection, the requirement for multi-position simultaneous tunnel inverted arch construction is met, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a large-span multi-station tunnel trestle. Background Art

[0002] Tunnel trestle is a professional equipment used for invert and filling in railway and highway tunnel construction. It is mainly composed of the main bridge, front and rear approach bridges, and multiple hydraulic systems and travel systems. By using the invert trestle to cross the invert operation section in tunnel construction, various vehicles, equipment and personnel can pass normally on the trestle, while operations such as tunnel invert reinforcement binding, invert and filling concrete pouring can be carried out under the trestle at the same time.

[0003] The span of tunnel trestles currently in use is mostly limited to within 40 meters. The downward deflection of steel box girders within 40 meters is small and easy to control. When the span increases, the central part of the steel box girder will show a large downward deflection, which seriously affects the practicality and reliability of the structure. In addition, due to the limitation of the construction space under the tunnel trestles within 40 meters, only limited-scale concrete pouring and other operations can be carried out, which will not only slow down the construction speed, but also may lead to an increase in project costs.

[0004] Therefore, there is an urgent need for a large-span multi-station tunnel trestle for invert construction that can effectively cope with the challenge of large spans while improving construction efficiency and safety. Summary of the invention

[0005] The invention solves the problem that the existing trestles have small spans and insufficient invert construction stations, and provides a large-span multi-station tunnel trestles. The main bridge of the trestles has a long span and a small deflection, which can meet the requirements of multiple tunnel invert construction stations being carried out simultaneously, thereby improving construction efficiency.

[0006] In order to achieve the above object, the technical solution of the present invention is: A large-span multi-station tunnel trestle is spanned above a tunnel invert, comprising a front approach bridge, a main bridge and a rear approach bridge connected in sequence, wherein the front approach bridge is located inside the tunnel invert, and the rear approach bridge is connected to a road, and running wheels are arranged at the bottom of the front approach bridge and the rear approach bridge, and a retractable support assembly and a movable running assembly are arranged under the main bridge. In the construction state, the support assembly is unfolded and the running assembly has no contact with the ground; in the running state, the support assembly is retracted and the running assembly contacts the ground.

[0007] The support assembly includes main supports arranged at both ends of the main bridge and at least one figure eight support arranged in the middle of the main bridge. The main supports are perpendicular to the ground, and the figure eight support is figure eight-shaped and spans above the inverted arch to overcome the large deflection caused by the large span.

[0008] The walking assembly includes a driving wheel system arranged at both ends of the main bridge, and at least one retractable auxiliary wheel system arranged in the middle of the main bridge. The auxiliary wheel system is retracted in the construction state, and is unfolded in the walking state. The auxiliary wheel system does not affect the construction state in the construction state, overcomes the large deflection caused by the large span in the walking state, and can ensure the stability of the trestle in the walking state.

[0009] Furthermore, the main bridge comprises two box beams arranged in parallel, and a transverse connecting beam is arranged inside the two box beams to ensure the rigidity requirement of the main bridge body.

[0010] Furthermore, the main support includes a first hydraulic cylinder and a hinge support, the first hydraulic cylinder is perpendicular to the horizontal plane, the fixed end of the first hydraulic cylinder is fixedly connected to the main bridge, and the telescopic end of the first hydraulic cylinder is rotatably connected to the hinge support. The main support is controlled by the first hydraulic cylinder.

[0011] Furthermore, the eight-shaped support includes two second hydraulic cylinders, which are in an eight-shaped shape together, and the angle between the second hydraulic cylinder and the horizontal plane is 40° to 45°. The fixed end of the second hydraulic cylinder is fixedly connected to the main bridge, and the telescopic end of the second hydraulic cylinder is rotatably connected to the hinge support. The eight-shaped support is set above the inverted arch and does not affect the filling construction of the inverted arch.

[0012] Furthermore, the driving wheel system includes a third hydraulic oil cylinder and a driving wheel, the fixed end of the third hydraulic oil cylinder is arranged at the bottom of the main bridge, the telescopic end of the third hydraulic oil cylinder is arranged with a driving wheel, and the driving wheel is driven by a hydraulic motor. The driving wheel system is used for the travel of the tunnel trestle.

[0013] Furthermore, the auxiliary wheel system includes a fourth hydraulic oil cylinder, a swing arm and a driven wheel, one end of the swing arm is rotatably connected to the bridge body, and the other end is provided with a driven wheel, the fixed end of the fourth hydraulic oil cylinder is rotatably connected to the bridge body, and the telescopic end of the fourth hydraulic oil cylinder is rotatably connected to the swing arm. The auxiliary wheel system adopts an articulated telescopic mechanism, which does not affect the construction state and can ensure the stability of the trestle walking state.

[0014] Furthermore, a balancing valve is provided on the fourth hydraulic cylinder to ensure the self-stability of the trestle.

[0015] Furthermore, it also includes a cantilever lifting mechanism, and the cantilever lifting mechanism includes a cantilever crane, which is convenient for laying tracks and transporting materials.

[0016] Furthermore, it also includes a wind belt lifting mechanism, which includes guide sleeves fixedly arranged on both sides of the main bridge, a lifting rod slidably arranged in the guide sleeve, and a fifth hydraulic cylinder driving the lifting rod to move in the guide sleeve. When the lifting rod moves to the top, the volume of the top wind belt in the tunnel is compressed to increase the vehicle passing area and ensure that the vehicle does not interfere with the wind belt when passing on the trestle.

[0017] Furthermore, a connecting portion is provided between the two oppositely arranged lifting rods, and the connecting portion is crescent-shaped. When the lifting rods are raised, the connecting portion contacts the wind belt, thereby compressing the volume of the wind belt.

[0018] Furthermore, the front approach bridge and the rear approach bridge are connected by splicing of approach bridge units of multiple sections, and each approach bridge unit is detachably connected by a pin shaft, which facilitates the installation of the front and rear approach bridges and improves the efficiency of their installation and assembly.

[0019] Through the above technical solution, the beneficial effects of the present invention are: The overall structural design of the present invention is reasonable. In order to overcome the problems of deflection and strength caused by the large span, the main bridge is equipped with a main support, an eight-shaped support and an auxiliary wheel system. Compared with the existing trestles, the invert construction station under the present trestles is 72m, which meets the requirements of multiple tunnel invert construction positions at the same time, thereby improving construction efficiency.

[0020] The present invention is provided with a supporting assembly and a walking assembly. In the construction state, the supporting assembly is unfolded and the walking assembly has no contact with the ground; in the walking state, the supporting assembly is folded and the walking assembly contacts the ground, which can ensure walking or supporting in different working states, thereby ensuring the stability of the entire equipment and its adaptability to ground conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the main support at the front end of the tunnel of the present invention; Figure 3 It is a schematic diagram of the structure of the main support of the present invention at the rear end of the tunnel; Figure 4 It is a schematic diagram of the structure of the eight-shaped support in the tunnel of the present invention; Figure 5 It is a schematic diagram of the structure of the driving gear system of the present invention in a tunnel; Figure 6 is a schematic structural diagram of the auxiliary gear train of the present invention; Figure 7 It is a schematic diagram of the structure of the auxiliary wheel system of the present invention in a tunnel; Figure 8 It is a schematic diagram of the structure of the cantilever lifting mechanism of the present invention in a tunnel; Fig. 9It is a schematic diagram of the structure of the wind belt lifting mechanism of the present invention in the tunnel; The numbers in the attached drawings are: 1 is the front approach bridge, 2 is the rear approach bridge, 3 is the main bridge, 31 is the box beam, 32 is the connecting beam, 4 is the main support, 41 is the first hydraulic cylinder, 5 is the hinge support, 6 is the eight-shaped support, 61 is the second hydraulic cylinder, 7 is the driving wheel system, 71 is the third hydraulic cylinder, 72 is the driving wheel, 8 is the auxiliary wheel system, 81 is the fourth hydraulic cylinder, 82 is the swing arm, 83 is the driven wheel, 9 is the cantilever crane, 10 is the fifth hydraulic cylinder, 11 is the guide sleeve, 12 is the lifting rod, 13 is the connecting part, and 14 is the wind belt. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments: like Figure 1 As shown, this embodiment provides a large-span multi-station tunnel trestle, which is spanned above the tunnel invert, and includes a front approach bridge 1, a main bridge 3 and a rear approach bridge 2 connected in sequence, wherein the front approach bridge 1 is located inside the tunnel invert, and the rear approach bridge 2 is connected to the road. Travel wheels are arranged at the bottom of the front approach bridge 1 and the rear approach bridge 2, and a retractable support assembly and a movable travel assembly are arranged under the main bridge 3. In the construction state, the support assembly is unfolded and the travel assembly has no contact with the ground; in the travel state, the support assembly is retracted and the travel assembly contacts the ground.

[0023] like Figure 2 to Figure 4 As shown, the support assembly includes main supports 4 arranged at both ends of the main bridge 3, and at least one S-shaped support 6 arranged in the middle of the main bridge 3. The main supports 4 are perpendicular to the ground, and the S-shaped support 6 is in an S-shape and is arranged above the invert. When in construction, the main supports 4 and the S-shaped support 6 support the main bridge 3, and below the main bridge 3 is a tunnel invert construction station.

[0024] like Figure 5 to Figure 7 As shown, the walking assembly includes a driving wheel train 7 arranged at both ends of the main bridge 3, and at least one retractable auxiliary wheel train 8 arranged in the middle of the main bridge 3. In the construction state, the auxiliary wheel train 8 is retracted; in the walking state, the auxiliary wheel train 8 is unfolded. In the walking state, the auxiliary wheel train 8 supports the main bridge 3 to overcome the large deflection caused by the large span.

[0025] The main bridge 3 includes two box beams 31 arranged in parallel, and a transverse connecting beam 32 is arranged inside the two box beams 31. The box beams 31 are assembled and connected by box beam units of multiple sections.

[0026] Figure 2 and Figure 3The figure shows a cross-sectional schematic diagram of the main support 4 in the tunnel. The main support 4 includes a first hydraulic cylinder 41 and a hinge support 5. The first hydraulic cylinder 41 is perpendicular to the horizontal plane. The fixed end of the first hydraulic cylinder 41 is fixedly connected to the main bridge 3. The telescopic end of the first hydraulic cylinder 41 is rotatably connected to the hinge support 5. In this embodiment, the main support 4 includes a group of first hydraulic cylinders 41 and hinge supports 5 symmetrically arranged on the box girder 31 of the main bridge 3. The main support 4 includes a front support and a rear support. Figure 2 As shown, the hinge support 5 of the front support is located inside the inverted arch and fits with the inverted arch; Figure 3 As shown, the hinge support 5 of the rear support is located on the road.

[0027] like Figure 4 As shown, the eight-shaped support 6 includes a second hydraulic cylinder 61 and a hinge support 5. There are two second hydraulic cylinders 61, and the two second hydraulic cylinders 61 are in an eight-shaped shape. The angle between the second hydraulic cylinder 61 and the horizontal plane is 40° to 45°. Preferably, the angle between the second hydraulic cylinder 61 and the horizontal plane is 42°. The fixed end of the second hydraulic cylinder 61 is fixedly connected to the main bridge 3, and the telescopic end of the second hydraulic cylinder 61 is rotatably connected to the hinge support 5. In this embodiment, the eight-shaped support 6 includes a group of second hydraulic cylinders 61 and hinge supports 5 symmetrically arranged on both sides of the bridge body. The fixed end of the second hydraulic cylinder 61 is arranged on the box girder 31 of the main bridge 3. Along the length direction of the main bridge 3, at least one eight-shaped support 6 is arranged on the main bridge 3. Since the eight-shaped support 6 is supported above the inverted arch, the construction of the inverted arch is not affected while maintaining the support strength.

[0028] like Figure 5 As shown, the driving wheel system 7 includes a third hydraulic cylinder 71 and a driving wheel 72. The fixed end of the third hydraulic cylinder 71 is arranged at the bottom of the main bridge 3, and the telescopic end of the third hydraulic cylinder 71 is provided with the driving wheel 72, and the driving wheel 72 is driven by a hydraulic motor. In this embodiment, the fixed end of the third hydraulic cylinder 71 is arranged at the bottom of the transverse connecting beam 32, and the third hydraulic cylinder 71 is arranged perpendicular to the horizontal plane.

[0029] like Figure 6 As shown, the auxiliary wheel train 8 includes a fourth hydraulic oil cylinder 81, a swing arm 82 and a driven wheel 83. One end of the swing arm 82 is rotatably connected to the bridge body, and the other end is provided with the driven wheel 83. The fixed end of the fourth hydraulic oil cylinder 81 is rotatably connected to the bridge body, and the telescopic end of the fourth hydraulic oil cylinder 81 is rotatably connected to the swing arm 82. The fourth hydraulic oil cylinder 81 controls the swing arm 82 to rotate relative to the main bridge 3, thereby controlling the folding or unfolding of the driven wheel 83. In this embodiment, the auxiliary wheel train 9 is arranged at the bottom of the transverse connecting beam 32. Figure 7 Shown is a cross-sectional view of the auxiliary gear train 8 in a tunnel.

[0030] In order to keep the extension height and force of the auxiliary wheel train 9 consistent, a balancing valve is provided on the fourth hydraulic cylinder 81 .

[0031] like Figure 8 As shown, the main bridge 3 is also provided with a cantilever lifting mechanism, which includes a cantilever crane 9. The cantilever crane 9 is a light crane, including a column, a slewing arm, a slewing drive device and an electric hoist. In this embodiment, the column is fixed on the top of the box beam 31, and a slewing arm is rotatably arranged at the top of the column. The slewing drive device drives the slewing arm to rotate. The cantilever lifting mechanism facilitates the laying of tracks and the transportation of materials.

[0032] like Fig. 9 As shown, the main bridge 3 is also provided with a wind belt lifting mechanism, which includes guide sleeves 11 fixedly arranged on both sides of the main bridge 3, a lifting rod 12 slidably arranged in the guide sleeve 11, and a fifth hydraulic cylinder 10 driving the lifting rod 12 to move in the guide sleeve 11. When the lifting rod 12 moves to the top, the volume of the top wind belt 14 in the tunnel is compressed. The wind belt lifting mechanism ensures that vehicles do not interfere with the wind belt 14 when passing on the trestle.

[0033] Specifically, a crescent-shaped connection part 13 is connected to the top of a group of lifting rods 12 arranged opposite to each other, and the width of the connection part 13 is greater than the width of the wind belt 14. The wind belt 14 is made of canvas and fixedly arranged on the top of the tunnel to maintain air circulation in the tunnel. When a large vehicle passes by, the fifth hydraulic cylinder 10 controls the lifting rod 12 to rise, and the connection part 13 between the two relatively arranged lifting rods 12 flattens the wind belt 14 to increase the vehicle passing area. The fixed end of the fifth hydraulic cylinder 10 is arranged on the top of the box beam 31, and the telescopic end of the fifth hydraulic cylinder 10 is connected to the lifting rod 12.

[0034] The front approach bridge 1 and the rear approach bridge 2 are connected by splicing of approach bridge units of multiple sections, and each approach bridge unit is detachably connected by a pin shaft. In the walking state, the front approach bridge 1 and the rear approach bridge 2 move together with the main bridge 3.

[0035] Working principle of the present invention: When the trestle is under construction, the large-span main bridge 3 of the trestle is equipped with main supports 4 and cross-shaped supports 6 to overcome the large deflection caused by the large span. Both the main supports 4 and cross-shaped supports 6 are hydraulically driven and equipped with balancing valves to ensure the self-stability of the trestle.

[0036] When the trestle is in the walking state, the main support 4 and the eight-shaped support 6 are retracted and retracted to leave the ground, and at the same time, the driving wheel system 7 at the front and rear ends of the large-span main bridge 3 of the trestle contacts the ground. Since the span of the trestle is large, the front and rear wheel systems are far apart, so an auxiliary wheel system 8 is set in the middle of the main bridge 3 of the trestle to overcome the large deflection caused by the large span. The auxiliary wheel system 8 adopts an articulated telescopic mechanism, which does not affect the construction state and can ensure the stability of the trestle in the walking state.

[0037] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A large-span multi-station tunnel trestle, spanning above a tunnel invert, comprising a front approach bridge (1), a main bridge (3) and a rear approach bridge (2) connected in sequence, characterized in that: The front approach bridge (1) and the rear approach bridge (2) are both provided with walking wheels at the bottom, and a retractable support assembly and a movable walking assembly are provided below the main bridge (3). In the construction state, the support assembly is unfolded and the walking assembly is not in contact with the ground; in the walking state, the support assembly is retracted and the walking assembly is in contact with the ground; The support assembly comprises main supports (4) arranged at both ends of the main bridge (3), and at least one figure-eight support (6) arranged in the middle of the main bridge (3), wherein the main supports (4) are perpendicular to the ground, and the figure-eight support (6) is in the shape of a figure-eight and is arranged above the invert; The walking assembly comprises a driving wheel train (7) arranged at both ends of the main bridge (3), and at least one retractable auxiliary wheel train (8) arranged in the middle of the main bridge (3); in a construction state, the auxiliary wheel train (8) is retracted; in a walking state, the auxiliary wheel train (8) is extended.

2. A large-span multi-station tunnel trestle according to claim 1, characterized in that: The main bridge (3) comprises two box beams (31) arranged in parallel, and a transverse connecting beam (32) is arranged inside the two box beams (31).

3. A large-span multi-station tunnel trestle according to claim 1, characterized in that: The main support (4) comprises a first hydraulic cylinder (41) and a hinge support (5); the first hydraulic cylinder (41) is perpendicular to a horizontal plane; a fixed end of the first hydraulic cylinder (41) is fixedly connected to the main bridge (3); and a telescopic end of the first hydraulic cylinder (41) is rotatably connected to the hinge support (5).

4. A large-span multi-station tunnel trestle according to claim 1, characterized in that: The eight-shaped support (6) comprises two second hydraulic cylinders (61), the two second hydraulic cylinders (61) together form an eight-shaped shape, the angle between the second hydraulic cylinders (61) and the horizontal plane is 40° to 45°, the fixed end of the second hydraulic cylinder (61) is fixedly connected to the main bridge (3), and the telescopic end of the second hydraulic cylinder (61) is rotatably connected to the hinge support (5).

5. The large-span multi-station tunnel trestle according to claim 1, characterized in that: The driving wheel train (7) comprises a third hydraulic cylinder (71) and a driving wheel (72); the fixed end of the third hydraulic cylinder (71) is arranged at the bottom of the main bridge (3); the telescopic end of the third hydraulic cylinder (71) is arranged on the driving wheel (72); and the driving wheel (72) is driven by a hydraulic motor.

6. The large-span multi-station tunnel trestle according to claim 1, characterized in that: The auxiliary wheel train (8) comprises a fourth hydraulic cylinder (81), a swing arm (82) and a driven wheel (83); one end of the swing arm (82) is rotatably connected to the bridge body, and the other end is provided with the driven wheel (83); the fixed end of the fourth hydraulic cylinder (81) is rotatably connected to the bridge body, and the telescopic end of the fourth hydraulic cylinder (81) is rotatably connected to the swing arm (82).

7. The large-span multi-station tunnel trestle according to claim 1, characterized in that: The fourth hydraulic cylinder (81) is provided with a balancing valve.

8. The large-span multi-station tunnel trestle according to claim 1, characterized in that: It also includes a cantilever lifting mechanism, wherein the cantilever lifting mechanism includes a cantilever crane (9).

9. The large-span multi-station tunnel trestle according to claim 1, characterized in that: The invention also comprises a wind belt lifting mechanism, the wind belt lifting mechanism comprising a guide sleeve (11) fixedly arranged on both sides of the main bridge (3), a lifting rod (12) slidably arranged in the guide sleeve (11), and a fifth hydraulic cylinder (10) driving the lifting rod (12) to move in the guide sleeve (11); when the lifting rod (12) moves to the top, the volume of the wind belt (14) at the top of the tunnel is compressed.

10. A large-span multi-station tunnel trestle according to claim 9, characterized in that: A connecting portion (13) is provided between two supporting rods (12) arranged opposite to each other, and the connecting portion (13) is crescent-shaped.

Images