A quick installation method suitable for variable cross-section tunnel anchor plug body strength framework

Abstract

The application provides a quick installation method suitable for a variable cross-section tunnel anchor plug body rigid framework, which splits the rigid framework into a basic framework and multiple radial telescopic folding units, and completes the construction through the core processes of data acquisition and blanking, pre-assembly outside the hole, folding to the minimum cross-sectional size of the tunnel opening, reusing the original tunnel slag track for integral sliding, rigid fixing through mechanical locking components after unfolding inside the hole, and installation of prestressed pipes; the construction quality can be further improved by real-time correction through laser positioning, synchronous unfolding through hydraulic driving, adjustable hydraulic jacking for surrounding rock reinforcement, and accurate pipe laying through prestressed pipe positioning slots. The application perfectly adapts to the variable cross-section characteristics of the tunnel anchor, i.e., "small outside and large inside", does not need to additionally set up a special sliding track, cancels a large number of welding operations inside the hole, reduces safety hazards, greatly improves the installation efficiency and positioning accuracy, reduces the safety hazards of narrow space operation, and significantly optimizes the construction cost and construction period.

Description

Technical Field

[0001] This application relates to the field of bridge and tunnel anchor construction technology, specifically to a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug. Background Technology

[0002] As a core foundation structure of large bridges such as suspension bridges, the quality of the prestressed construction of the tunnel anchor plug directly determines the overall load-bearing capacity and durability of the bridge. During the construction of the tunnel anchor plug, the prestressed duct needs to be precisely positioned using a stiffening frame. The stiffening frame is a crucial support structure for the installation and positioning of the prestressed duct, and its installation accuracy must be strictly guaranteed to avoid misalignment of the prestressed duct and ensure the subsequent tensioning effect.

[0003] Because the tunnel anchor excavation construction requires the installation of a slag transport track for transporting excavated soil, and due to geological conditions and structural design limitations, the tunnel anchor has a variable cross-section structure with a "small outside and large inside" characteristic. The cross-sectional size of the tunnel entrance is small, while the cross-sectional size of the internal anchor plug gradually increases. In addition, the internal construction space is narrow, making it impossible for traditional large-scale hoisting equipment and hoisting machinery to enter the operation, which brings great challenges to the installation of the stiffening frame.

[0004] The traditional modular manual assembly method involves disassembling the rigid frame into multiple small components, transporting them to their designed locations inside the tunnel via muck transport tracks or manually, and then assembling them on-site by workers through welding or bolting. This method is currently the most common way to install tunnel anchor rigid frames, and there are no specific patents or proprietary documents describing it; it is a standard construction method in the industry.

[0005] Patent CN107227686A discloses a construction scheme for positioning supports. This patent is a construction method for positioning supports of a tunnel-type anchorage prestressed system. The core scheme is as follows: 2-3 fixed-size truss-type positioning support units are prefabricated outside the tunnel. A special sliding track (including the sliding track support outside the tunnel and the sliding track support inside the tunnel) is additionally erected inside the tunnel. The positioning support units are pulled along the special track to the design position by a winch. Then, manual work is carried out to "extend the vertical pole", "weld the horizontal bar to the pre-embedded steel support of the tunnel wall", and "bolt connect the front and rear truss units", finally forming a complete positioning support. The prestressed pipe is fixed by positioning steel plates welded to the truss horizontal bar.

[0006] However, existing technologies, including patent CN107227686A, do not have a design to adapt to the "smaller outside, larger inside" variable cross-section. They all suffer from problems such as large workload of assembly and welding inside the tunnel, low installation efficiency, difficulty in ensuring positioning accuracy, the need to build additional sliding tracks, and significant safety hazards in welding operations inside the tunnel. Traditional modular manual assembly methods have many drawbacks: components are disassembled and scattered, the splicing process is cumbersome, and the limited space inside the hole makes it inconvenient for workers to operate; there is a lack of precise positioning and guiding devices, resulting in large errors in manual alignment; welding operations must be carried out in enclosed and narrow spaces, with poor ventilation and safety protection conditions; installation efficiency is extremely low and the assembly cycle is long; manual assembly relies on the experience of workers, resulting in poor positioning accuracy; the amount of welding work in narrow spaces is large, posing significant safety hazards. The patent CN107227686A solution also fails to adapt to the "small outside, large inside" variable cross-section structure of tunnel anchors: the positioning support unit of this patent is a fixed-size truss structure without telescopic or folding functions. If used for tunnel anchors with "small outside, large inside," the truss needs to be disassembled into smaller units (which will double the assembly workload), or the size adaptation can be achieved through a large number of "vertical rod extensions and horizontal rod extensions" splicing operations inside the tunnel. Essentially, it does not solve the core adaptation contradiction of variable cross-section structures. Furthermore, this patent requires the separate construction of sliding track supports outside and inside the tunnel. The track construction process is cumbersome, increasing material and labor costs and occupying the critical path construction period of the tunnel anchor. Utilizing existing muck transport tracks in the tunnel anchorage leads to a waste of construction resources; the amount of assembly and welding work inside the tunnel is large, with low efficiency and poor precision: after sliding into place, a large number of operations need to be carried out inside the tunnel, such as extending the vertical rods, welding the horizontal rods to the pre-embedded supports, and splicing the truss units. Relying on manual alignment and welding not only results in low construction efficiency, but the welding heat can easily cause deformation of the supports. Manual alignment has cumulative errors, making it difficult to guarantee the positioning accuracy of the prestressed ducts; high-altitude welding and component extension operations in the confined space inside the tunnel pose safety risks such as fire, poisoning from harmful gases, and falls from heights. In addition, manual adjustment of guy ropes and jacks are required to fine-tune the posture of the supports, resulting in high labor intensity and low operational safety.

[0007] Against this backdrop, the applicant proposed a new technical solution. Summary of the Invention

[0008] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a rapid installation method for the stiffening frame of a variable cross-section tunnel anchor plug, the technical solution of which includes: A rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug includes the following steps: S1. Data Acquisition and Material Cutting: Measure the actual size parameters of the tunnel anchor initial support, statistically analyze the design dimensions of each installation section of the stiffening frame, deliver the steel section to the back site for cutting, disassemble the stiffening frame into a basic frame and multiple radial telescopic folding units, and prefabricate the basic frame, multiple radial telescopic folding units and mechanical locking components in the back site. S2. Pre-assembly and retraction outside the tunnel: At the assembly site at the entrance of the tunnel anchorage, the prefabricated foundation frame and multiple radial telescopic folding units are transported to the site for assembly. The assembly is carried out using a crane. All radial telescopic folding units are connected to the foundation frame in an adjustable way by telescopic and / or folding to complete the pre-assembly of the stiffening frame. The angle and linearity of the stiffening frame are checked. After confirming that there are no errors, the radial telescopic folding units are retracted to the size of the minimum cross-section of the tunnel anchorage entrance and the retracted state is fixed by temporary fasteners. S3. Track Adaptation and Lifting: After the rigid frame is folded up, a sliding base is fixedly connected to its bottom. The sliding base includes a guide wheel assembly. The rigid frame is lifted onto the original muck transport track in the tunnel anchor hole. The guide wheel assembly is adjusted to ensure that it fits precisely with the muck transport track. The traction connection point between the traction system and the rigid frame is fixed. S4. Overall sliding: Start the traction system to drive the stiffened frame to slide at a constant speed along the slag transport track into the tunnel anchor hole, and drive the stiffened frame to slide along the slag transport track into the tunnel anchor hole to the design position. S5. Tunnel Deployment and Mechanical Locking: Release the temporary fasteners, deploy all radial telescopic folding units to the designed cross-sectional dimensions, and rigidly fix the radial telescopic folding units using the mechanical locking assembly; S6. Installation of prestressed ducts: Install the prestressed ducts sequentially at the outer ends of the radial expansion and folding units to complete the overall installation of the stiffening frame.

[0009] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. In step S2, the pre-assembly is carried out on the pre-assembly platform at the tunnel entrance using the long-line method. After the pre-assembly is completed, the overall angle, linearity and dimensions of each node of the rigid skeleton are checked. Temporary fixing parts are temporary steel wire ropes used to bind and fix the retracted radial telescopic folding unit to the foundation frame.

[0010] According to an embodiment of the present invention, a rapid installation method for a stiffening frame of a variable cross-section tunnel anchor plug body includes a positioning and calibration step in step S3: fixing the correction component to the stiffening frame, installing a laser emitter at the entrance of the tunnel anchor hole, installing a laser receiver at the end of the stiffening frame, and calibrating the laser axis to coincide with the designed axis of the tunnel anchor hole; step S4 also includes a real-time correction step: during the sliding process, the laser receiver receives the laser signal in real time, and when the stiffening frame is detected to be deviated, the correction component is activated to push and correct the deviation until the stiffening frame slides to the designed position.

[0011] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. In step S4, the traction system uses a winch for transporting the original excavated soil in the tunnel anchor hole.

[0012] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. In step S4, the traction system drives the rigid skeleton to slide at a constant speed along the slag transport track into the tunnel anchor hole until it precisely abuts against the preset limit block.

[0013] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. In step S2, a hydraulic drive is provided on the base frame, and the hydraulic drive is connected to the radial telescopic folding unit. In step S5, all radial telescopic folding units are simultaneously expanded to the designed cross-sectional size by the hydraulic drive on the base frame.

[0014] According to an embodiment of the present invention, a rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug is provided. After step S5 is completed, a surrounding rock reinforcement step is also included: installing a hydraulic jacking connector on the rigid frame, installing an adjustable hydraulic jacking on the hydraulic jacking connector, using the adjustable hydraulic jacking as a temporary support, and evenly arranging it along the circumference of the rigid frame to reinforce the rigid frame with the surrounding rock of the tunnel anchor hole, preventing displacement during the pouring process, and completing the overall installation and positioning of the rigid frame.

[0015] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. In step S6, the outer end of the radial telescopic folding unit is provided with a prestressed duct positioning slot. The prestressed duct is fixed in the prestressed duct positioning slot by a snap-fit ​​method. All prestressed duct positioning slots are coaxially aligned when the radial telescopic folding unit is unfolded to the design position.

[0016] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. When the length of the tunnel anchor hole is long and multiple rigid skeletons need to be installed, positioning slot steel pipe joints are set at the front and rear ends of the foundation frame. The coaxial splicing of multiple skeletons is achieved through the positioning slot steel pipe joints. After the splicing is completed, steps S3-S6 are repeated to complete the installation of the subsequent skeletons.

[0017] According to an embodiment of the present invention, a rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug is provided. The radial telescopic folding unit includes a telescopic connection unit, a hinged folding connection unit, and / or a telescopic hinged combination unit. The members exceeding the minimum cross-section of the tunnel opening are made of hinged folding units, while the rest are made of telescopic connection units or telescopic hinged combination units.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This invention employs an adjustable connection method with telescopic and / or folding features to design a radially telescopic and folding unit. This allows the rigid frame to retract to the minimum cross-sectional size of the tunnel anchor opening outside the tunnel, smoothly entering the anchor hole and unfolding to the designed cross-sectional size inside. This perfectly adapts to the variable cross-section structure of the tunnel anchor, which is smaller on the outside and larger on the inside. It directly reuses the existing muck transport track in the tunnel to achieve overall sliding, eliminating the need for additional dedicated sliding tracks. This significantly simplifies construction procedures, reduces material and labor costs, and shortens the critical path construction period. The process involves overall pre-assembly outside the tunnel, mechanical unfolding inside the tunnel, and mechanical locking. This method eliminates a large amount of welding work inside the tunnel, significantly improving installation efficiency and completely avoiding safety hazards such as fires and poisoning from harmful gases caused by welding in confined spaces. Laser positioning and real-time correction further improve the positioning accuracy of the rigid frame. Adjustable hydraulic jacks reinforce the frame against the surrounding rock, effectively preventing frame displacement during concrete pouring. Prestressed duct positioning slots ensure coaxial alignment of the ducts, significantly improving installation efficiency while maintaining positioning accuracy, reducing safety hazards in confined spaces, and optimizing construction costs and schedule. (See attached diagram.) The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the design of the tunnel anchorage and portal assembly site in this invention; Figure 2 This is a schematic diagram of the stiffening frame of the present invention; Figure 3 This is a schematic diagram of the rigid frame of the present invention sliding along the slag transport track inside the tunnel anchor hole; Figure 4 This is a schematic diagram of the fit between the rigid frame and the slag transport track in this invention; Figure 5 This is a schematic diagram of the rigid frame of the present invention being installed and deployed inside the tunnel anchorage.

[0019] In the diagram: 10. Basic frame; 20. Sliding base; 30. Slag transport track; 40. Radial telescopic folding unit; 50. Positioning slot steel pipe joint; 60. Assembly site; 70. Crane; 80. Laser emitter; 90. Tunnel anchor hole; 100. Winch. Detailed Implementation

[0020] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0021] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] This invention provides a rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug, comprising the following steps: S1. Data acquisition and material cutting: Measure the actual size parameters of the tunnel anchor initial support, count the design dimensions of each installation section of the stiffening frame, deliver the steel section to the back site to complete the cutting, and disassemble the stiffening frame into a basic frame 10 and multiple radial telescopic folding units 40. In the back site, prefabricate the basic frame 10, multiple radial telescopic folding units 40 and the components of the mechanical locking assembly. S2. Pre-assembly and folding outside the tunnel: such as Figure 1 , 2As shown, at the assembly site 60 at the entrance of the tunnel anchorage 90, the prefabricated foundation frame 10 and multiple radial telescopic folding units 40 are transported to the site for assembly using a crane 70. The radial telescopic folding unit 40 includes telescopic connecting units, hinged folding connecting units, and / or telescopic hinged combination units. Members exceeding the minimum cross-section of the tunnel entrance use hinged folding units, while the rest use telescopic connecting units or telescopic hinged combination units. All radial telescopic folding units 40 are connected to the foundation frame 10 via telescopic and / or folding connections. The adjustable connection method of the stacking completes the pre-assembly of the stiffening frame. The pre-assembly is carried out on the pre-assembly platform at the tunnel entrance using the long line method. The overall angle, linearity and the dimensions of each node of the stiffening frame are checked. After confirming that there are no errors, the radial telescopic folding unit 40 is folded up to the size of the minimum cross-section of the tunnel anchor hole 90. The folded state is fixed by temporary fasteners, which are temporary steel wire ropes, and the folded radial telescopic folding unit 40 is tied and fixed to the foundation frame 10. A hydraulic drive is provided on the foundation frame 10 and is connected to the radial telescopic folding unit 40. S3. Track adaptation and hoisting: such as Figure 3 As shown, the folded rigid frame is fixedly connected to the sliding base 20 at its bottom. The sliding base 20 includes a guide wheel assembly. The rigid frame is hoisted onto the original muck transport track 30 of the tunnel anchor hole 90. The guide wheel assembly is adjusted to ensure that it is precisely fitted with the muck transport track 30. The traction connection point between the traction system and the rigid frame is fixed. The correction component is fixedly connected to the rigid frame. A laser emitter 80 is installed at the entrance of the tunnel anchor hole 90, and a laser receiver is installed at the end of the rigid frame. The laser axis is calibrated to coincide with the design axis of the tunnel anchor hole 90. S4, Overall Sliding: (e.g., ...) Figure 3 , 4 As shown, the traction system is started. The traction system uses the existing winch 100 for transporting excavated soil in the tunnel anchor hole 90 to drive the rigid frame to slide at a constant speed along the excavated soil transport track 30 into the tunnel anchor hole 90. During the sliding process, the laser receiver receives laser signals in real time. When the rigid frame is detected to be deviated, the correction component is activated to push and correct the deviation until the rigid frame slides along the excavated soil transport track 30 into the tunnel anchor hole 90 to the design position. In specific implementation, a limit block is installed at the predetermined design position. The rigid frame is brought to slide until it precisely abuts against the preset limit block. S5. In-cavity deployment and mechanical locking: such as Figure 5As shown, the temporary fasteners are released, and all radial telescopic folding units 40 are simultaneously expanded to the designed cross-sectional size by the hydraulic drive unit on the base frame 10. The radial telescopic folding units 40 are rigidly fixed by the mechanical locking assembly. A hydraulic jacking connector is installed on the stiffening frame, and an adjustable hydraulic jacking is installed on the hydraulic jacking connector. The adjustable hydraulic jacking is used as a temporary support and is evenly arranged along the circumference of the stiffening frame to reinforce the stiffening frame with the surrounding rock of the tunnel anchor hole 90, preventing displacement during the pouring process and completing the overall installation and positioning of the stiffening frame. S6. Installation of prestressed ducts: Install the prestressed ducts sequentially at the outer end of the radial telescopic folding unit 40. Specifically, a prestressed duct positioning slot is provided at the outer end of the radial telescopic folding unit 40. The prestressed ducts are fixed in the prestressed duct positioning slot by snap-fit. All prestressed duct positioning slots are coaxially aligned when the radial telescopic folding unit 40 is unfolded to the design position, thus completing the overall installation of the stiffening frame. When the length of the tunnel anchor hole 90 is relatively long and multiple stiffening frames need to be installed, positioning slot steel pipe joints 50 are set at the front and rear ends of the foundation frame 10. The coaxial splicing of multiple frames is achieved through the positioning slot steel pipe joints 50. After the splicing is completed, steps S3-S6 are repeated to complete the installation of the subsequent frames.

[0025] The present invention uses the assembly structure design of radial telescopic folding unit 40 and basic frame 10 to fold and assemble the whole outside the tunnel and then slide quickly using slag transport track 30. Then, it is hydraulically driven to unfold and lock inside the tunnel. The whole process does not require the handling of scattered components and a large amount of welding. Only a small number of personnel are needed to operate, which significantly shortens the construction cycle. This invention reduces sliding positioning errors by coordinating the correction and limiting functions of the laser positioning component and the track sliding component; it reuses the existing slag transport track 30 in the tunnel anchor hole 90, eliminating the need for additional sliding channels; the skeleton module is reusable, reducing material waste and lowering overall construction costs; the sliding component is precisely matched with the slag transport track 30, integrating guiding, correction, and limiting functions, eliminating the need for additional construction and reducing costs and construction time; This invention has low safety risks. The radial telescopic folding unit 40 can be unfolded and locked inside the hole without welding operations, avoiding the risks of fire and poisoning from high-altitude and overhead welding in confined spaces, and reducing the labor intensity of manual handling. The invention enables a unified process of "external tunnel assembly and retraction - overall track sliding - internal radial deployment - locking and positioning" through the coordinated operation of its various components. This eliminates the need for extensive welding work, significantly improves efficiency and accuracy, eliminates safety hazards, and enables rapid, precise, and safe installation of the variable cross-section tunnel anchorage skeleton. It effectively solves various defects of traditional processes and significantly improves construction quality and economic benefits.

[0026] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug, characterized in that, The steps include the following: S1. Data acquisition and material cutting: Measure the actual size parameters of the tunnel anchor initial support, count the design dimensions of each installation section of the stiffening frame, deliver the steel section to the back site to complete the cutting, and disassemble the stiffening frame into a basic frame (10) and multiple radial telescopic folding units (40). In the back site, prefabricate the components of the basic frame (10), multiple radial telescopic folding units (40) and mechanical locking components. S2. Pre-assembly and retraction outside the tunnel: At the assembly site (60) at the entrance of the tunnel anchor hole, the prefabricated foundation frame (10) and multiple radial telescopic folding units (40) are transported to the site for assembly. The assembly is carried out using a crane (70). All radial telescopic folding units (40) and the foundation frame (10) are connected by telescopic and / or folding adjustable connection to complete the pre-assembly of the stiffening frame. The angle and linearity of the stiffening frame are checked. After confirming that there are no errors, the radial telescopic folding units (40) are retracted to the size of the minimum cross section of the tunnel anchor hole entrance and the retracted state is fixed by temporary fasteners. S3. Track adaptation and hoisting: After the rigid frame is folded up, a sliding base (20) is fixedly connected to its bottom. The sliding base (20) includes a guide wheel assembly. The rigid frame is hoisted onto the original slag transport track (30) of the tunnel anchor hole. The guide wheel assembly is adjusted to ensure that it fits precisely with the slag transport track (30). The traction connection point between the traction system and the rigid frame is fixed. S4. Overall sliding: Start the traction system to drive the stiffened frame to slide at a constant speed along the slag transport track (30) into the tunnel anchor hole, and drive the stiffened frame to slide along the slag transport track (30) into the tunnel anchor hole to the design position; S5. Deployment and mechanical locking inside the tunnel: Release the temporary fixings, deploy all radial telescopic folding units (40) to the designed cross-sectional dimensions, and rigidly fix the radial telescopic folding units (40) through the mechanical locking assembly; S6. Installation of prestressed ducts: Install the prestressed ducts sequentially at the outer end of the radial expansion and folding unit (40) to complete the overall installation of the stiffening frame.

2. The rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, In step S2, the pre-assembly is carried out on the pre-assembly platform at the opening using the long line method. After the pre-assembly is completed, the overall angle, linearity and dimensions of each node of the rigid frame are checked. Temporary fasteners are temporary steel wire ropes used to tie and fix the retracted radial telescopic folding unit (40) to the basic frame (10).

3. The rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, Step S3 also includes a positioning calibration step: the correction component is fixedly connected to the stiffening frame, a laser emitter (80) is installed at the entrance of the tunnel anchor hole, a laser receiver is installed at the end of the stiffening frame, and the laser axis is calibrated to coincide with the design axis of the tunnel anchor hole; Step S4 also includes a real-time correction step: during the sliding process, the laser receiver receives the laser signal in real time, and when the stiffening frame is detected to be deviated, the correction component is activated to push and correct the deviation until the stiffening frame slides to the design position.

4. The rapid installation method for a rigid skeleton of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, In step S4, the traction system uses the existing winch (100) for transporting excavated soil in the tunnel anchor hole.

5. The rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, In step S4, the traction system drives the stiffened frame to slide at a constant speed along the slag transport track (30) into the tunnel anchor hole until it precisely contacts the preset limit block.

6. The rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, In step S2, a hydraulic drive unit is provided on the base frame (10), and the hydraulic drive unit is connected to the radial telescopic folding unit (40); in step S5, all radial telescopic folding units (40) are simultaneously unfolded to the designed cross-sectional size through the hydraulic drive unit on the base frame (10).

7. The rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 1, characterized in that, After step S5 is completed, the following steps are also included: installing hydraulic jacking connectors on the rigid frame, installing adjustable hydraulic jacking on the hydraulic jacking connectors, using adjustable hydraulic jacking as temporary support components, evenly arranging them along the circumference of the rigid frame, and reinforcing the rigid frame with the surrounding rock of the tunnel anchor hole to prevent displacement during the pouring process, thus completing the overall installation and positioning of the rigid frame.

8. A rapid installation method for a rigid frame of a variable cross-section tunnel anchor plug body according to claim 7, characterized in that, In step S6, the outer end of the radial telescopic folding unit (40) is provided with a prestressed pipe positioning slot. The prestressed pipe is fixed in the prestressed pipe positioning slot by a snap-fit ​​method. All the prestressed pipe positioning slots are coaxially aligned when the radial telescopic folding unit (40) is unfolded to the design position.

9. The rapid installation method according to claim 1, characterized in that, When the length of the tunnel anchor hole is long and multiple stiffening frames need to be installed, positioning slot steel pipe joints (50) are set at the front and rear ends of the foundation frame (10). The coaxial splicing of multiple frames is achieved through the positioning slot steel pipe joints (50). After the splicing is completed, repeat steps S3-S6 to complete the installation of the subsequent frames.

10. The rapid installation method according to claim 1, characterized in that, The radial telescopic folding unit (40) includes a telescopic connection unit, a hinged folding connection unit and / or a telescopic hinged combination unit, wherein the members exceeding the minimum cross-section of the opening adopt a hinged folding unit, and the rest adopt a telescopic connection unit or a telescopic hinged combination unit.

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