A construction method for installing a tunnel top segment reinforcement cage

Abstract

The application provides a construction method for mounting a tunnel top segment reinforcement cage, and belongs to the technical field of tunnel construction. A bracket carrying a reinforcement cage is driven to the lower part of a trolley by a transport vehicle, and the bracket is hoisted to the reinforcement cage storage area of the trolley by a winch on the trolley. The reinforcement cage on the bracket is hoisted and moved to the middle position by a first arc-shaped track on the trolley, and the reinforcement cage is rotated from the longitudinal direction to the transverse direction. Then, the longitudinal transfer trolley on the trolley receives the reinforcement cage and moves to the reinforcement cage mounting trolley on the second arc-shaped track, the reinforcement cage is gripped and fixed by the reinforcement cage mounting trolley, and the reinforcement cage is transported to the designated position along the second arc-shaped track. Then, the reinforcement cage mounting trolley adjusts the reinforcement cage in six degrees of freedom, so that the reinforcement cage is accurately mounted to the target mounting position of the tunnel top surface. The application improves the work efficiency and effectively ensures the accuracy of the reinforcement cage mounting position.

Description

Technical Field

[0001] This invention belongs to the field of tunnel construction technology, specifically relating to a construction method for installing segmented steel reinforcement cages at the top of a tunnel. Background Technology

[0002] In tunnel construction, rebar cage binding is a mandatory step. Only after the rebar is bound can the secondary lining concrete be poured. The quality and efficiency of the rebar cage binding directly affect subsequent procedures and even the overall quality and progress of tunnel construction. Current tunnel rebar installation uses a binding method, requiring multiple people standing at different positions on a rebar trolley to pass the cage up to the trolley and then lift it together to position and fix it. This method is inefficient, requires a large number of personnel, is labor-intensive, and cannot effectively guarantee the accuracy of the rebar cage's installation position. Currently, existing rebar trolleys only function as scaffolding and cannot meet the needs of modular rebar installation.

[0003] For the installation of prefabricated rebar cages, the rebar cages at the tunnel ceiling are arc-shaped and need to be installed in sections (can be divided into 3 sections, i.e., at one cross-section construction location, 3 arc-shaped rebar cage sections are sequentially laid out at the tunnel ceiling to form a large arc-shaped rebar cage at the tunnel ceiling). During construction, each rebar cage section weighs approximately 800 kg, which is quite heavy and cannot be installed manually. Therefore, it is necessary to design a construction method for installing segmented rebar cages at the tunnel ceiling to improve work efficiency, reduce manpower input, and effectively ensure the accuracy of the rebar cage installation position. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a construction method for installing segmented steel reinforcement cages at the top of a tunnel.

[0005] This invention is achieved through the following technical solution:

[0006] A construction method for installing segmented steel reinforcement cages at the top of a tunnel includes the following steps:

[0007] Step 1: The ground material transport vehicle carries the bracket containing the steel cage and drives it to the area under the trolley;

[0008] Step 2: Use the winch on the trolley to hoist the bracket on the ground material transport vehicle to the steel cage storage area of ​​the trolley;

[0009] Step 3: The hoist trolley on the first arc track of the trolley lifts the top layer of the steel cage on the bracket. After lifting it to a height higher than the ventilation pipe, the hoist trolley moves the steel cage to the middle position below the first arc track. Then, the construction workers rotate the steel cage from longitudinal to transverse.

[0010] Step 4: The longitudinal transfer trolley on the trolley moves along the longitudinal track on the top of the trolley to the bottom of the horizontally positioned steel cage lifted by the hoist trolley. The hoist trolley is then disconnected from the steel cage, so that the horizontally positioned steel cage is placed on the lifting arm of the longitudinal transfer trolley.

[0011] Step 5: The longitudinal transfer trolley carrying the rebar cage moves along the longitudinal track on the top of the trolley to the rebar cage installation trolley on the second arc track on the trolley. The lifting arm of the longitudinal transfer trolley lowers, placing the rebar cage on the rebar cage installation trolley. The rebar cage installation trolley grabs and fixes the rebar cage, completing the material receiving. Then, the rebar cage installation trolley transports the rebar cage along the second arc track to the designated position. Then, the rebar cage installation trolley adjusts the rebar cage in six degrees of freedom: longitudinal movement, deflection, radial movement, flipping, pitching, and circumferential movement, so that the rebar cage is accurately installed at the target installation position on the tunnel roof.

[0012] Step 6: Repeat steps 3-5 to install the next section of the steel cage.

[0013] In the above technical solution, the trolley includes a trolley body, with a first arc-shaped track and a second arc-shaped track on the top of the trolley body. The position of the trolley body below the first arc-shaped track is set as a rebar cage storage area, which is used to accommodate brackets. Winches for hoisting brackets are set on both sides of the rebar cage storage area. A hoist trolley is installed on the first arc-shaped track to provide hoisting and transportation functions for the rebar cage. A rebar cage installation trolley is installed on the second arc-shaped track to grab the rebar cage and transport it to the designated installation position on the tunnel top. A longitudinal transfer trolley is set on the trolley body to transport the rebar cage hoisted by the hoist trolley to the rebar cage installation trolley.

[0014] In the above technical solution, in step 1, each bracket supports three stacked longitudinal steel cages. These three steel cages are three segmented steel cages to be installed on the tunnel roof, namely: segment B steel cage, segment C steel cage and segment D steel cage.

[0015] In the above technical solution, two steel cage installation trolleys are set on the second arc-shaped track. During construction, the first steel cage installation trolley is used to receive and install the steel cage section B. At the same time as the steel cage section B is installed, the second steel cage installation trolley receives the steel cage section D and sends it to the installation position. After the steel cage section B is installed, the first steel cage installation trolley receives the steel cage section C, and then the steel cage sections C and D are installed simultaneously.

[0016] In the above technical solution, the curvature of the first arc track and the second arc track is consistent with the curvature of the tunnel top surface, the first arc track and the second arc track are set at intervals, and the upper surface of both the first arc track and the second arc track is provided with teeth.

[0017] In the above technical solution, the steel cage storage area is located outside the ventilation duct.

[0018] In the above technical solution, the longitudinal transfer trolley is installed on the longitudinal track at the middle position of the top of the trolley body, and can move longitudinally. The height of the longitudinal transfer trolley is less than the height of the first arc track, so that the longitudinal transfer trolley can pass through the first arc track.

[0019] In the above technical solution, the main frame of the trolley body includes a lower gantry and an upper gantry. The middle left area of ​​the upper gantry is used to accommodate two ventilation pipes side by side, and the right area of ​​the upper gantry serves as the storage area for the steel cage. A longitudinal rail is set at the top middle position of the upper gantry for the longitudinal transport trolley to move. A ladder is also set on the trolley body for construction personnel to go up and down. Guide tubes for ventilation pipes are set at both ends of the trolley body. The first arc-shaped rail is installed on the upper gantry, and the second arc-shaped rail is installed on the lower gantry. The height of the first arc-shaped rail is greater than the height of the second arc-shaped rail.

[0020] In the above technical solution, the bottom end of the hoist rope of the hoist trolley is connected to the hanger, the hanger is arc-shaped, and multiple hooks are set at intervals on the hanger.

[0021] In the above technical solution, the structure of the longitudinal transfer trolley is as follows: it includes a base plate with wheels at the bottom; a frame is installed on the base plate, and a lifting arm driven by a lifting drive cylinder is installed on the frame. The lifting arm is used to insert into the bottom of the steel cage and lift the steel cage.

[0022] In the above technical solution, the structure of the rebar cage installation trolley is as follows: it includes a base shell, on which a wheel set that mates with the second arc-shaped track is installed, enabling the rebar cage installation trolley to travel along the second arc-shaped track; two rebar cage gripping and positioning mechanisms are symmetrically arranged on the base shell for gripping and positioning the rebar cage; each rebar cage gripping and positioning mechanism includes a longitudinally arranged support frame, on which two slide blocks are slidably mounted, and each slide block is provided with a gripping hook, which is mounted on the outer wall of the slide block via a rotating shaft and a rotating shaft connecting lug. The system includes a gripping drive cylinder located between the bottom end of the gripping hook and the bottom end of the slide block; a longitudinal movement drive cylinder is installed on the support frame, which is connected to one of the slide blocks, and the two slide blocks are connected by a connecting plate, thereby driving the two slide blocks to slide synchronously along the support frame through the longitudinal movement drive cylinder; a lifting drive cylinder is installed inside the base housing, and the support frame is mounted on top of the lifting drive cylinder via a hinged support; the hinge axis of the hinged support is perpendicular to the longitudinal support frame, and a pitch drive cylinder is installed between the hinged support and the support frame.

[0023] The advantages and beneficial effects of this invention are as follows:

[0024] The present invention has a first arc-shaped track and a second arc-shaped track on the top of the trolley. The trolley body below the first arc-shaped track is set as a steel cage storage area, which is used to accommodate the bracket. Winches for hoisting the bracket are set on both sides of the steel cage storage area, so as to realize the material handover with the ground material transport vehicle. That is, the ground material transport vehicle transports the bracket carrying the steel cage to the position below the trolley, and then the bracket is connected to the hoisting rope of the winch, and the winch lifts the bracket carrying the steel cage to the steel cage storage area.

[0025] The present invention has a hoist trolley installed on the first arc-shaped track. The hoist trolley first lifts the steel cage in the longitudinal position in the steel cage storage area from the outside of the ventilation pipe to a height higher than the ventilation pipe. Then the hoist trolley lifts the steel cage and moves it to the middle position below the first arc-shaped track, so that the steel cage has enough room to move in the middle position, which makes it easy to rotate the steel cage from longitudinal to transverse.

[0026] The present invention also includes a longitudinal transfer trolley on the trolley, which is used to transport the steel cage in a transverse position, which is lifted by the hoist trolley, to the steel cage installation trolley.

[0027] The present invention has a steel cage installation trolley installed on the second arc track. The steel cage installation trolley can grab and fix the steel cage and adjust the steel cage in six degrees of freedom: longitudinal movement, deflection, radial movement, flipping, pitching and circumferential movement, so that the steel cage can be accurately installed to the target installation position on the top surface of the tunnel.

[0028] This invention features two rebar cage installation trolleys mounted on the second arc-shaped track. During construction, the first rebar cage installation trolley first receives and installs the B-section rebar cage. Simultaneously, the second rebar cage installation trolley receives the D-section rebar cage and delivers it to the installation position. After the B-section rebar cage is installed, the first rebar cage installation trolley receives the C-section rebar cage, and then both the C-section and D-section rebar cages are installed simultaneously, thereby greatly improving construction efficiency and shortening the construction cycle.

[0029] The trolley of this invention utilizes the coordinated work of a hoist trolley, a longitudinal transport trolley, and a rebar cage installation trolley, which can greatly improve work efficiency, reduce personnel input, and effectively ensure the accuracy of the rebar cage installation position. Attached Figure Description

[0030] Figure 1 This is a front view structural diagram of the trolley.

[0031] Figure 2 This is a side view diagram of the trolley structure.

[0032] Figure 3 This is a schematic diagram of the bracket's hoisting structure.

[0033] Figure 4 This is a schematic diagram of the main frame of the trolley.

[0034] Figure 5 This is a schematic diagram of the structure of the hoist trolley's rope connection frame.

[0035] Figure 6 This is a schematic diagram of the longitudinal transfer trolley.

[0036] Figure 7 This is a schematic diagram of the structure after the longitudinal transfer trolley is raised.

[0037] Figure 8 A three-dimensional structural diagram of the trolley used to install the steel reinforcement cage.

[0038] Figure 9 A side view of the internal structure of the trolley used to install the steel cage.

[0039] Figure 10 A frontal view of the internal structure of the trolley used to install the steel cage.

[0040] Figure 11 This is a schematic diagram showing the material delivery status when the ground material transport vehicle is moving under the trolley.

[0041] Figure 12 This is a schematic diagram showing the state of the steel cage after it has been rotated from longitudinal to transverse.

[0042] Figure 13This is a schematic diagram showing the longitudinal transfer trolley moving to the position below the hoist trolley.

[0043] Figure 14 This is a schematic diagram showing the longitudinal transfer trolley moving to the location of the rebar cage installation trolley.

[0044] Figure 15 This is a schematic diagram for installing the steel reinforcement cage in section B.

[0045] Figure 16 This is a schematic diagram for installing the C-section and D-section steel cages.

[0046] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0048] This embodiment provides a construction method for installing segmented steel reinforcement cages at the top of a tunnel, which is based on a trolley.

[0049] See Appendix below. Figure 1 - Appendix Figure 10 The trolley described herein is introduced.

[0050] See appendix Figure 1 and attached Figure 2 The trolley includes a trolley body 1, with a traveling wheel device 101 at the bottom for moving the trolley along the tunnel. A first arc-shaped track 11 and a second arc-shaped track 12 are provided on the top of the trolley body 1. The curvature of the first arc-shaped track 11 and the second arc-shaped track 12 matches the curvature of the tunnel ceiling, and the first and second arc-shaped tracks are spaced apart. Below the first arc-shaped track 11, at the position of the trolley body, a rebar cage storage area 2 is set up. This rebar cage storage area 2 is located outside the ventilation pipe 4 and is used to accommodate a bracket 9. The bracket 9 is used to support longitudinally arranged rebar cages 3. Preferably, the bracket 9 supports three stacked longitudinally arranged rebar cages 3, which are three segmented rebar cages to be installed on the tunnel ceiling. Winches 91 are provided on both sides of the rebar cage storage area 2 for hoisting the bracket 9 to the rebar cage storage area 2. For details, see the appendix. Figure 3Two winches 91 are symmetrically arranged on both sides of the rebar cage storage area 2. A pulley assembly 92 is installed above each winch 91. The hoisting rope of the winch 91 passes through the pulley assembly 92 and connects to the bracket 9, thereby enabling the raising and lowering of the bracket 9. This facilitates material transfer with the ground material transport vehicle (i.e., the ground material transport vehicle transports the bracket carrying the rebar cage to the position below the trolley, then connects the bracket 9 to the hoisting rope of the winch 91, and the winch 91 lifts the bracket carrying the rebar cage to the rebar cage storage area 2). A hoist trolley 5 is installed on the first arc-shaped track 11. The hoist trolley 5 can travel on the first arc-shaped track 11 to provide hoisting and moving functions for the rebar cage 3 (here, hoisting and moving functions refer to both vertical lifting and horizontal moving functions; firstly, the rebar cage 3 in the longitudinally placed state in the rebar cage storage area 2 is lifted from the outside of the ventilation pipe 4). The steel cage 3 is hoisted to a height higher than the ventilation duct, and then the hoist trolley 5 lifts the steel cage 3 and moves it to the middle position below the first arc-shaped track 11, so that the steel cage 3 has enough room to move in the middle position (to facilitate the rotation of the steel cage 3 from longitudinal to transverse); a steel cage installation trolley 6 is installed on the second arc-shaped track 12, which can travel on the second arc-shaped track 12 to grab the steel cage and transport it to the designated installation position on the top of the tunnel; a longitudinal transfer trolley 7 is provided on the trolley body 1, which is installed on the longitudinal track 8 at the middle position of the top of the trolley body 1, and can move longitudinally. The height of the longitudinal transfer trolley 7 is less than the height of the first arc-shaped track 11, so that the longitudinal transfer trolley 7 can pass through the first arc-shaped track 11. The longitudinal transfer trolley 7 is used to transport the steel cage 3 hoisted by the hoist trolley 5 to the steel cage installation trolley 6.

[0051] Furthermore, a ladder 104 is also provided on the trolley body 1 for construction personnel to go up and down; and a guide tube 105 is provided at both ends of the trolley body 1, through which the ventilation pipe 4 passes.

[0052] Furthermore, two first arc-shaped tracks 11 and two rebar cage storage areas 2 are set on the trolley body 1. Each first arc-shaped track 11 is equipped with a hoist trolley 5, and each rebar cage storage area 2 is equipped with a bracket 9. Each bracket 9 is hoisted by a winch 91 on the trolley body 1. The winches 91 are positioned on both sides of the rebar cage storage area 2. Each bracket 9 supports three longitudinally stacked rebar cages 3. Thus, one trolley can carry two sets of rebar cages 3 (each set includes three stacked rebar cages).

[0053] As a preferred method, further explanation can be found in the appendix. Figure 4The main frame of the trolley body 1 includes a lower gantry 102 and an upper gantry 103. The left-hand area 1031 of the upper gantry 103 is used to accommodate two parallel ventilation pipes 4, and the right-hand area 1032 of the upper gantry 103 serves as the steel cage storage area 2. A longitudinal rail 8 is provided at the top center of the upper gantry 103 for the longitudinal transport trolley 7 to travel. The first arc-shaped rail 11 is installed on the upper gantry 103, and the second arc-shaped rail 12 is installed on the lower gantry 102, making the length of the second arc-shaped rail 12 large enough to allow the steel cage installation trolley 6 on the second arc-shaped rail 12 to travel to the construction positions of the three sections B, C, and D on the tunnel top surface. In addition, the height of the first arc-shaped rail 11 is greater than the height of the second arc-shaped rail 12, and there is sufficient gap between the second arc-shaped rail 12 and the tunnel top surface for installing the steel cage installation trolley 6. The upper surfaces of the first arc-shaped track 11 and the second arc-shaped track 12 are both provided with teeth to enable the hoist trolley 5 and the steel cage installation trolley 6 to move on the tracks.

[0054] As a preferred method, further explanation can be found in the appendix. Figure 5 The bottom end of the hoist rope of the hoist trolley 5 is connected to the hanger 51. The hanger 51 is arc-shaped and has multiple hooks 52 spaced apart. The hooks 52 are connected to the steel cage 3.

[0055] As a preferred method, further explanation can be found in the appendix. Figure 6 and attached Figure 7 The longitudinal transfer trolley 7 has the following structure: it includes a base plate 71, with wheels 72 mounted on the bottom of the base plate 71. The wheels 72 are driven by a motor to move the longitudinal transfer trolley 7. A stand 73 is mounted on the base plate 71, and a lifting arm 74 is mounted on the stand 73 via a slider 75. A lifting drive cylinder 76 is mounted on the stand 73, and the actuating end of the lifting drive cylinder 76 is connected to the slider 75 via a connector, thereby controlling the lifting arm 74 to rise and fall. During operation, the lifting arm 74 is inserted into the bottom of the reinforcing cage 3, and then the lifting drive cylinder 76 controls the lifting arm 74 to rise, thus lifting the reinforcing cage 3. Furthermore, the bottom of the stand 73 is connected to the base plate 71 via a pivot 77, and a tilting drive cylinder 78 is mounted on the base plate 71. This tilting drive cylinder 78 is used to adjust the tilt angle of the stand 73, thereby adjusting the pitch angle of the reinforcing cage.

[0056] As a preferred method, further explanation can be found in the appendix. Figure 8 - Appendix Figure 10The structure of the rebar cage installation trolley 6 is as follows: it includes a base shell 61, on which a wheel set is installed to cooperate with the second arc-shaped track 12, enabling the rebar cage installation trolley to travel along the second arc-shaped track 12; two rebar cage gripping and adjusting mechanisms 62 are symmetrically arranged on the base shell 61 for gripping and adjusting the rebar cage; specifically, the rebar cage gripping and adjusting mechanism 62 includes a longitudinally arranged support frame 621, on which two slide blocks 622 are slidably installed, and each slide block 622 is provided with a gripping hook 623, which is mounted on the slide block 62 through a rotating shaft 624 and a rotating shaft connecting lug 6241. On the outer wall of component 2, a gripping drive cylinder 625 is installed between the bottom end of the gripping hook 623 and the bottom end of the slide block 622. This gripping drive cylinder 625 drives the gripping hook 623 to grip the rebar cage, thus stably fixing the rebar cage onto the slide block 622. Furthermore, the upper surface of the slide block 622 is inclined to better adapt to the shape of the rebar cage and provide better support. A longitudinal movement drive cylinder 626 is installed on the support frame 621. This longitudinal movement drive cylinder 626 is connected to one of the slide blocks 622, and the two slide blocks 622 are connected by a connecting plate 6221. Thus, the longitudinal movement drive cylinder 626 drives both slide blocks 622. The sliding blocks 622 slide synchronously along the support frame 621. When the longitudinal movement drive cylinders 626 of the two rebar cage gripping and adjusting mechanisms 62 operate synchronously, the overall longitudinal movement position of the rebar cage is adjusted. When the longitudinal movement drive cylinders 626 of the two rebar cage gripping and adjusting mechanisms 62 operate asynchronously, the deflection angle of the rebar cage is adjusted. A lifting drive cylinder 627 is installed inside the base housing 61. The support frame 621 is mounted on top of the lifting drive cylinder 627 via a hinged support 628. The lifting drive cylinder 627 controls the lifting and lowering of the support frame 621. Therefore, when the lifting drive cylinders 627 of the two rebar cage gripping and adjusting mechanisms 62 operate synchronously, the overall longitudinal movement position of the rebar cage is adjusted. The overall radial movement position of the rebar cage (since the rebar cage installation trolley travels on an arc-shaped track, the lifting here refers to radial adjustment along the tunnel) is adjusted by asynchronously moving the lifting drive cylinders 627 of the two rebar cage gripping and adjusting mechanisms 62 to adjust the flipping angle of the rebar cage. The hinge axis of the hinge support 628 is perpendicular to the longitudinal support frame 621, giving the support frame 621 a degree of freedom to rotate around the hinge axis, which can be called pitch freedom. A pitch drive cylinder 629 is set between the hinge support 628 and the support frame 621 to adjust the pitch angle of the support frame 621, thereby adjusting the pitch angle of the rebar cage. In summary, through the above-mentioned longitudinal movement, deflection, radial movement, flipping, and pitching, as well as the circumferential movement of the rebar cage installation trolley 6 along the second arc-shaped track 12, the six degrees of freedom adjustment of the rebar cage is achieved, enabling the rebar cage to be accurately installed to the target position on the tunnel top surface.

[0057] Furthermore, the wheel set includes a driven wheel set 63 and a driving wheel set 64. The driven wheel set 63 is disposed on both side walls of the base housing 61, with two sets of driven wheels on each side wall. Each set of driven wheels includes two driven wheels arranged vertically and staggered. These two driven wheels respectively abut against the upper and lower sides of the flange of the second arc-shaped track 12, thereby ensuring that the base housing 61 is stably mounted on the second arc-shaped track 12 and will not detach from it. The driving wheel set 64 is disposed inside the base housing and connected to the drive motor 65 inside the base housing. The driving wheel set 64 meshes with the teeth on the upper surface of the second arc-shaped track 12, thereby driving the rebar cage installation trolley 6 to move on the second arc-shaped track 12. Furthermore, a clamping parking device 66 is also disposed on the side wall of the base housing 61. When the rebar cage installation trolley 6 stops at a certain position, the clamping parking device 66 clamps the flange of the second arc-shaped track 12, ensuring the rebar cage installation trolley 6 is stably parked. Alternatively, in the absence of a clamping parking device 66, a drive motor 65 with good braking function can be selected to achieve a stable stop of the steel cage installation trolley 6 on the second arc track 12 at the required position.

[0058] Based on the aforementioned trolley, the construction method for installing the segmented steel reinforcement cage at the top of the tunnel according to the present invention is as follows:

[0059] Step 1: See Appendix Figure 11 A ground material transport vehicle 100 carries two brackets 9 that hold steel cages. The vehicle travels to the bottom of the trolley. Each bracket 9 holds three stacked longitudinal steel cages 3. These three steel cages 3 are the three segmented steel cages to be installed on the top surface of the tunnel, referred to as segment B, segment C, and segment D (the steel cages on both sides of the tunnel are referred to as segment A and segment E). The construction method of this invention describes how to install the three segments B, C, and D steel cages.

[0060] Step 2: Use the winch 91 on the trolley to hoist the two brackets 9 on the ground material transport vehicle to the two steel cage storage areas 2 on the trolley respectively.

[0061] Step 3: The hoist trolley 5 on the first arc-shaped track 11 of the trolley lifts the uppermost steel cage (section B steel cage) on the bracket 9. After lifting it to a height higher than the ventilation duct, the hoist trolley 5 moves the steel cage 3 to the middle position below the first arc-shaped track 11, so that the steel cage 3 has sufficient room to move in the middle position. Then, the construction workers rotate the steel cage 3 from longitudinal to transverse (see appendix). Figure 12 ).

[0062] Step 4: See Appendix Figure 13The longitudinal transfer trolley 7 on the trolley moves along the longitudinal track on the top of the trolley to below the steel cage 3 lifted by the hoist trolley 5, disconnects the hoist trolley 5 from the steel cage 3 in the transverse state, and places the steel cage 3 in the transverse state on the lifting arm 74 of the longitudinal transfer trolley 7.

[0063] Step 5: See Appendix Figure 14 The longitudinal transfer trolley 7, carrying the rebar cage 3, moves along the longitudinal track on the top of the trolley to the rebar cage installation trolley 6 on the second arc track 12 on the trolley (the rebar cage installation trolley 6 needs to be moved to the middle position of the top of the second arc track 12 in advance, i.e., the receiving position). The lifting arm 74 of the longitudinal transfer trolley 7 lowers, so that the rebar cage 3 is placed on the rebar cage installation trolley 6, and the rebar cage installation trolley 6 grabs and fixes the rebar cage 3, completing the receiving. Then, the rebar cage installation trolley 6 transports the rebar cage along the second arc track 12 to the designated position (i.e., preliminary positioning). Then, the rebar cage installation trolley 6 adjusts the rebar cage in six degrees of freedom: longitudinal movement, deflection, radial movement, flipping, pitching, and circumferential movement (i.e., fine-tuning positioning), so that the rebar cage is accurately installed at the target installation position on the tunnel top surface (the rebar cage needs to be manually fixed).

[0064] Step 6: Repeat steps 3-5 to install the next section of the steel cage on the bracket.

[0065] As a preferred option, two rebar cage installation trolleys 6 are installed on the second arc-shaped track 12. During construction, the first rebar cage installation trolley 6 is used to receive and install the rebar cage 31 in section B (see appendix). Figure 15 While the B-section rebar cage is being installed, the second rebar cage installation trolley 6 receives the material and delivers the D-section rebar cage to its installation position. After the B-section rebar cage is installed, the first rebar cage installation trolley 6 receives the material for the C-section rebar cage, and then simultaneously installs the C-section rebar cage 32 and the D-section rebar cage 33 (see appendix). Figure 16 ).

[0066] Step 7: After the installation of the two sets of BCD section steel cages is completed, the lower bracket 9 is hoisted onto the ground material transport vehicle, and the ground material transport vehicle drives away with the empty bracket 9.

[0067] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0069] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A construction method for installing segmented steel reinforcement cages at the top of a tunnel, characterized in that, Includes the following steps: Step 1: The ground material transport vehicle carries the bracket containing the steel cage and drives it to the area under the trolley; Step 2: Use the winch on the trolley to hoist the bracket on the ground material transport vehicle to the steel cage storage area of ​​the trolley; Step 3: The hoist trolley on the first arc track of the trolley lifts the top layer of the steel cage on the bracket. After lifting it to a height higher than the ventilation pipe, the hoist trolley moves the steel cage to the middle position below the first arc track. Then, the construction workers rotate the steel cage from longitudinal to transverse. The hoist trolley is used to provide both vertical lifting and transverse movement for the steel cage. Step 4: The longitudinal transfer trolley on the trolley moves along the longitudinal track on the top of the trolley to the bottom of the horizontally positioned steel cage lifted by the hoist trolley. The hoist trolley is then disconnected from the steel cage, so that the horizontally positioned steel cage is placed on the lifting arm of the longitudinal transfer trolley. Step 5: The longitudinal transfer trolley carrying the rebar cage moves along the longitudinal track on the top of the trolley to the rebar cage installation trolley on the second arc track on the trolley. The lifting arm of the longitudinal transfer trolley lowers, placing the rebar cage on the rebar cage installation trolley. The rebar cage installation trolley grabs and fixes the rebar cage, completing the material receiving. Then, the rebar cage installation trolley transports the rebar cage along the second arc track to the designated position. Then, the rebar cage installation trolley adjusts the rebar cage in six degrees of freedom: longitudinal movement, deflection, radial movement, flipping, pitching, and circumferential movement, so that the rebar cage is accurately installed at the target installation position on the tunnel roof. Step 6: Repeat steps 3-5 to install the next section of the steel cage on the bracket.

2. The construction method for installing segmented steel reinforcement cages at the top of the tunnel according to claim 1, characterized in that: The trolley includes a trolley body, with a first arc-shaped track and a second arc-shaped track on the top of the trolley body. The area below the first arc-shaped track of the trolley body is designated as a rebar cage storage area, which is used to accommodate brackets. Winches for hoisting brackets are installed on both sides of the rebar cage storage area. A hoist trolley is installed on the first arc-shaped track to provide hoisting and transportation functions for the rebar cages. A rebar cage installation trolley is installed on the second arc-shaped track to grab the rebar cages and transport them to the designated installation position on the tunnel roof. A longitudinal transfer trolley is installed on the trolley body to transport the rebar cages hoisted by the hoist trolley to the rebar cage installation trolley.

3. The construction method for installing segmented steel reinforcement cages at the top of the tunnel according to claim 1, characterized in that: In step 1, each bracket supports three stacked longitudinal steel cages. These three steel cages are three segmented steel cages to be installed on the tunnel roof, namely: segment B steel cage, segment C steel cage and segment D steel cage.

4. The construction method for installing segmented steel reinforcement cages at the top of the tunnel according to claim 3, characterized in that: Two steel cage installation trolleys are set on the second arc track. During construction, the first steel cage installation trolley is used to receive and install the steel cage section B. At the same time as the steel cage section B is installed, the second steel cage installation trolley receives the steel cage section D and delivers it to the installation position. After the steel cage section B is installed, the first steel cage installation trolley receives the steel cage section C, and then the steel cage sections C and D are installed simultaneously.

5. The construction method for installing segmented steel reinforcement cages at the top of a tunnel according to claim 1, characterized in that: The curvature of the first and second arc-shaped tracks is consistent with the curvature of the tunnel top surface. The first and second arc-shaped tracks are set at intervals, and the upper surfaces of both the first and second arc-shaped tracks are provided with teeth.

6. The construction method for installing segmented steel reinforcement cages at the top of a tunnel according to claim 1, characterized in that: The longitudinal transfer trolley is installed on the longitudinal track at the middle position of the top of the trolley body, and can move longitudinally. The height of the longitudinal transfer trolley is less than the height of the first arc track, so that the longitudinal transfer trolley can pass through the first arc track.

7. The construction method for installing segmented steel reinforcement cages at the top of the tunnel according to claim 2, characterized in that: The main frame of the trolley body includes a lower gantry and an upper gantry. The middle left area of ​​the upper gantry is used to accommodate two ventilation pipes side by side, and the right area of ​​the upper gantry serves as the storage area for the rebar cage. A longitudinal rail is set at the top center of the upper gantry for the longitudinal transport trolley to move. A staircase is also set on the trolley body for construction personnel to go up and down. Guide tubes for ventilation pipes are set at both ends of the trolley body. The first arc-shaped rail is installed on the upper gantry, and the second arc-shaped rail is installed on the lower gantry. The height of the first arc-shaped rail is greater than the height of the second arc-shaped rail.

8. The construction method for installing segmented steel reinforcement cages at the top of a tunnel according to claim 1, characterized in that: The bottom end of the hoist trolley's lifting rope is connected to a hanging frame, which is arc-shaped and has multiple hooks spaced apart.

Images