Shield secondary starting reaction frame in hole in limited space and installation detection method

Abstract

The invention relates to the technical field of counter-force frame supporting, in particular to a shield secondary starting counter-force frame in a hole in a limited space and an installation and detection method, and by means of non-disassembly operation, the disassembly and assembly frequency of a shield tunneling machine is reduced, the equipment damage risk is reduced, and the construction time is shortened. The anchor rod plate is constructed on the poured tunnel lining, and the hanging hoist is used for operation, so that the stability and the safety are enhanced. The top cross beam is suspended through a reserved hanging ring and adapts to narrow space. The ladder truck and the electric hoist are matched for operation, flexibility and efficiency are improved, and risks are reduced. The prefabricated concrete block base improves the construction speed, and the embedded steel plate enhances the stability. The right diagonal brace provides stability, particularly when eccentrically originating and space-limited. Required equipment and materials are prepared in advance, construction delay is reduced, and efficiency is improved. Therefore, the problem of installation failure caused by the fact that a right-angle structure of a traditional counter-force frame cannot be embedded into the second lining due to insufficient operation space on the right side of a subsurface tunnel is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of reaction frame supports, and particularly to a reaction frame for the second launch of a shield tunneling machine in a limited space inside a tunnel and an installation and detection method therefor. Background Art

[0002] Tunnel engineering plays a crucial role in the construction of urban underground transportation networks. As an efficient tunnel boring equipment, the stability and safety of a shield tunneling machine are of vital importance to the success of the entire project.

[0003] In tunnel engineering, the starting position of a shield tunneling machine usually requires a stable reaction frame support device to ensure the balance of the shield tunneling machine and control ground settlement. However, under certain specific engineering conditions, such as the second launch position inside the tunnel, eccentric launch in the shield-driven excavation section, and small operating space on the right side of the shield-driven tunnel, the installation and fixation of the reaction frame of the shield tunneling machine become extremely difficult. Especially when the columns above the right side of the reaction frame are affected by the tunnel space.

[0004] Traditional support methods cannot be directly installed, which makes it difficult to ensure the stability and safety of the shield tunneling machine during the starting process. In addition, the limited space also restricts the design and construction methods of the reaction frame, making it difficult for traditional support devices to adapt to this special working environment. Traditional reaction frame support devices for shield tunneling machines usually require a large installation space to ensure the stability of the shield tunneling machine during tunneling. However, under limited space conditions, these devices often cannot meet the construction requirements, especially when the reaction frame needs to closely cooperate with the tunnel structure. This not only affects the tunneling efficiency of the shield tunneling machine but also may increase construction risks. Summary of the Invention

[0005] The purpose of the present invention is to provide a reaction frame for the second launch of a shield tunneling machine in a limited space inside a tunnel and an installation and detection method therefor, aiming to solve the problem that the lack of operating space on the right side of the shield-driven tunnel causes the right-angle structure of the traditional reaction frame to be unable to be embedded inside the secondary lining, resulting in installation failure.

[0006] To achieve the above object, in a first aspect, the present invention provides a reaction frame for the second launch of a shield tunneling machine in a limited space inside a tunnel, including a reaction frame body, lifting rings, precast concrete block bases, a plurality of left diagonal braces, a plurality of right diagonal braces, and concrete linings;

[0007] The reaction frame body is welded to the precast concrete block base, the lifting rings are installed on the tunnel lining structure, one ends of the plurality of left diagonal braces are respectively connected to the reaction frame body, and the other ends are respectively welded to the guide platform embedded steel plates, and one ends of the plurality of right diagonal braces are respectively connected to the reaction frame body, and the other ends are respectively connected to the concrete linings.

[0008] Among them, the reaction frame body includes a top cross beam, a right column, a bottom cross beam and a left column. The left column is installed on the precast concrete block base, the top cross beam is installed on the left column, the bottom cross beam is installed at a position of the left column away from the top cross beam, and the right column is installed on a side of the bottom cross beam away from the left column.

[0009] Among them, the size of the precast concrete block base is 1300×1500×350 mm, and a steel plate of 1000×1000×20 mm is embedded in the precast concrete block base.

[0010] Among them, both the left inclined strut and the right inclined strut adopt a telescopic steel support structure, and its telescopic range is 0.5 m to 1.5 m, which can be adjusted according to the specific situation of the internal space of the tunnel.

[0011] Among them, stress monitoring sensors and displacement monitoring sensors are arranged on the reaction frame. The stress monitoring sensors and the displacement monitoring sensors are used to monitor the stress and deformation conditions of the reaction frame during the working process in real time.

[0012] In a second aspect, a method for installing and detecting a reaction frame for the second initial launch of a shield in a confined space is used for the reaction frame for the second initial launch of a shield in a confined space described in the first aspect, and includes the following steps:

[0013] Pre-install lifting rings on the tunnel lining structure and place the precast concrete block base at a predetermined position;

[0014] Using a scissor lift and an electric hoist lifting device, hoist each part of the reaction frame body onto the precast concrete block base respectively and perform welding and assembly according to the requirements;

[0015] According to the specific situation of the internal space of the tunnel and the requirements of the eccentric initial launch angle, adjust the telescopic length and angle of the left inclined strut and the right inclined strut;

[0016] Install stress monitoring sensors and displacement monitoring sensors on the reaction frame body;

[0017] During the initial launch of the shield machine, use the stress monitoring sensors and displacement monitoring sensors to monitor the stress and deformation conditions of the reaction frame in real time, analyze and evaluate according to the monitoring data, and make records and reports.

[0018] A reaction frame for the second launch of a shield tunneling machine in a confined space inside a tunnel according to the present invention includes a reaction frame body, lifting rings, precast concrete block bases, a plurality of left inclined braces, a plurality of right inclined braces, and a concrete lining. The reaction frame body is welded to the precast concrete block base. The lifting rings are installed on the tunnel lining structure. One end of each of the plurality of left inclined braces is connected to the reaction frame body, and the other end of each is welded to the embedded steel plate of the guide table. One end of each of the plurality of right inclined braces is connected to the reaction frame body, and the other end of each is connected to the concrete lining. By not disassembling the machine for operation, the present invention reduces the number of times of disassembling and assembling the shield tunneling machine, reduces the risk of equipment damage and construction time. The entire shield tunneling machine unit is translated horizontally to the starting end wall, simplifying the process and improving the efficiency. The disassembly and transportation of the reaction frame are flexible and adaptable to the limited space of the tunnel. Anchor plates are constructed on the already cast tunnel lining, and hanging hoists are used for operation, enhancing stability and safety. The top crossbeam is suspended using the reserved lifting rings, adapting to the narrow space. A scissor lift and an electric hoist cooperate for operation, improving flexibility and efficiency and reducing risks. A 1.7 m second lining structure is not cast, facilitating the installation and subsequent reinforcement of the reaction frame. The precast concrete block base improves the construction speed, and the embedded steel plate enhances stability. The right inclined braces provide stability, especially during eccentric launching and when space is limited. The required equipment and materials are prepared in advance, reducing construction delays and improving efficiency. The column supports are welded to the embedded steel plate, enhancing stability, improving the operation efficiency and safety, and reducing costs and risks. Thus, the problem that the traditional right-angle structure of the reaction frame cannot be embedded inside the second lining due to insufficient operating space on the right side of the mined tunnel, resulting in installation failure, is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 FIG. is a schematic structural diagram of a reaction frame for the second launch of a shield tunneling machine in a confined space inside a tunnel provided by the present invention.

[0021] Figure 2 FIG. is a schematic structural diagram of a left inclined brace.

[0022] Figure 3 FIG. is a schematic structural diagram of a right inclined brace.

[0023] Figure 4 FIG. is a flowchart of a method for installing and detecting a reaction frame for the second launch of a shield tunneling machine in a confined space inside a tunnel provided by the present invention.

[0024] In the figure: 1 - top crossbeam, 2 - right vertical column, 3 - bottom crossbeam, 4 - left vertical column, 5 - lifting ring, 6 - precast concrete block base, 7 - right diagonal brace, 8 - left diagonal brace, 9 - concrete lining, 10 - stress monitoring sensor, 11 - displacement monitoring sensor. Specific embodiments

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0026] Please refer to Figures 1 to 3 , in the first aspect, the present invention provides a reaction frame for the second launching of a shield in a limited - space tunnel, including a reaction frame body, a lifting ring 5, a precast concrete block base 6, a plurality of left diagonal braces 8, a plurality of right diagonal braces 7, and a concrete lining 9;

[0027] The reaction frame body is welded to the precast concrete block base 6, the lifting ring 5 is installed on the tunnel lining structure, one ends of the plurality of left diagonal braces 8 are respectively connected to the reaction frame body, and the other ends are respectively welded to the guide table embedded steel plates. One ends of the plurality of right diagonal braces 7 are respectively connected to the reaction frame body, and the other ends are respectively connected to the concrete lining 9.

[0028] The reaction frame body includes a top crossbeam 1, a right vertical column 2, a bottom crossbeam 3, and a left vertical column 4. The left vertical column 4 is installed on the precast concrete block base 6, the top crossbeam 1 is installed on the left vertical column 4, the bottom crossbeam 3 is installed on the left vertical column 4 away from the top crossbeam 1, and the right vertical column 2 is installed on the side of the bottom crossbeam 3 away from the left vertical column 4.

[0029] The size of the precast concrete block base 6 is 1300×1500×350 mm, and a steel plate with a size of 1000×1000×20 mm is embedded inside the precast concrete block base 6.

[0030] Both the left diagonal brace 8 and the right diagonal brace 7 adopt a telescopic steel support structure, and its telescopic range is from 0.5 m to 1.5 m, which can be adjusted according to the specific situation of the internal space of the tunnel.

[0031] Stress monitoring sensors 10 and displacement monitoring sensors 11 are arranged on the reaction frame. The stress monitoring sensors 10 and the displacement monitoring sensors 11 are used to monitor the stress and deformation conditions of the reaction frame during the working process in real - time.

[0032] In this embodiment, the shield machine is translated as a whole to the position of 14.4m from the starting end wall through a push operation (i.e., no excavation, only machine movement) without dismantling the machine, and then the push operation is suspended. After the reaction frame is dismantled, it is hoisted into the starting well, transported to the connecting bridge position by a battery car, and then dragged out horizontally from both sides. During the operation, an anchor plate (greater than 1.0m from the construction joint position) can be applied on the poured tunnel lining, and a hanging hoist can be used for operation. After the reaction frame is transported to the designated location, due to space limitations and the requirement that the shield machine is not dismantled for installation, it is necessary to first hang the top beam of the reaction frame on the top of the shield machine using the 4 sets of lifting rings 5 ​​(double-piece diameter 32mm) reserved by the tunnel lining structure. The specific operation is carried out by a climbing vehicle in conjunction with an electric hoist. After the shield machine passes, the beam is lowered to the installation position. After the suspension and reinforcement of the top beam of the reaction frame is completed, the shield machine unit continues to push it to the starting end wall to install the reaction frame. The invert arch and secondary lining structure at the installation position of the shield reaction frame are reserved for 1.7m and will not be cast for the time being. Two 200H steels are used as rail supports at the lower part of the guide rail within the reserved range to prevent the rail from deforming. The shield tunneling section adopts an eccentric starting method. Since the operating space on the right side of the dark excavation tunnel is small, it is necessary to transport the reaction steel ring, welding machine and other equipment and materials required for the starting preparation to the secondary starting section in advance. The bottom of the reaction frame adopts a prefabricated concrete block base 6 (size is 1300×1500×350mm), and a 1000×1000×20mm steel plate is embedded in the base. The reaction frame column support is welded to the concrete embedded steel plate. First install the right column 2 of the reaction frame, and then install the bottom crossbeam and the left column 4. Anchor plates can be applied on the structural lining, and the installation operation can be carried out with a 15t hand winch. The reaction frame diagonal brace adopts a steel support with a diameter of 609mm, and 3 supports are set on the left and right sides of the reaction frame. The bottom of the diagonal brace of the left column 4 is welded and fixed to the embedded steel plate of the guide platform, and the first support of the right column 2 is fixed to the poured concrete lining 9. The present invention reduces the number of disassembly and assembly of the shield machine by not disassembling the machine, reducing the risk of equipment damage and construction time. The shield unit is translated to the starting end wall as a whole, simplifying the process and improving efficiency. The reaction frame is flexible to disassemble and transport, and adapts to the limited space of the tunnel. The anchor plate is applied on the poured tunnel lining, and the suspension hoist is used for operation, which enhances stability and safety. The top crossbeam is suspended by the reserved lifting ring 5 to adapt to the narrow space. The aerial platform and the electric hoist work together to improve flexibility and efficiency and reduce risks. The 1.7m second lining structure is reserved and not poured, which is convenient for the installation of the reaction frame and subsequent reinforcement. The prefabricated concrete block base 6 increases the construction speed, and the embedded steel plate enhances stability. The right diagonal brace provides stability, especially when the starting is eccentric and the space is limited. Prepare the required equipment and materials in advance to reduce construction delays and improve efficiency. The column supports are welded to the embedded steel plates to enhance stability, improve work efficiency and safety, and reduce costs and risks.Thus, the problem that the traditional right-angle structure of the reaction frame cannot be embedded inside the secondary lining due to insufficient operating space on the right side of the mined tunnel, resulting in installation failure, is solved.

[0033] Please refer to Figure 4 , secondly, a method for installing and detecting the reaction frame for the second launching of a shield tunneling machine in a confined space, which is used for the reaction frame for the second launching of a shield tunneling machine in a confined space described in the first aspect, includes the following steps:

[0034] S1 Pre-install the lifting rings 5 on the tunnel lining structure and place the precast concrete block base 6 at the predetermined position;

[0035] Specifically, pre-install the lifting rings 5 on the tunnel lining structure and ensure their firmness and reliability. At the same time, check whether the position of the embedded steel plate of the precast concrete block base 6 is accurate and whether the dimensions meet the requirements. Place the precast concrete block base 6 at the predetermined position and fixedly connect it to the tunnel floor through appropriate fixing devices (such as anchor bolts) to ensure the stability of the base.

[0036] S2 Use a boom lift and an electric hoist lifting equipment to hoist each part of the reaction frame body to the precast concrete block base 6 respectively and weld and assemble them according to the requirements;

[0037] Specifically, use lifting equipment such as a boom lift and an electric hoist to hoist each part of the reaction frame body (including the top cross beam 1, the right column 2, the bottom cross beam 3, and the left column 4) to the precast concrete block base 6 respectively and weld and assemble them according to the design requirements. During the assembly process, ensure the firm connection between the components.

[0038] S3 Adjust the telescopic length and angle of the left diagonal brace 8 and the right diagonal brace 7 according to the specific situation of the internal space of the tunnel and the requirements of the eccentric launching angle;

[0039] Specifically, adjust the telescopic length and angle of the left diagonal brace 8 and the right diagonal brace 7 (both are telescopic steel support structures) according to the specific situation of the internal space of the tunnel and the requirements of the eccentric launching angle. For the adjustable-angle connectors at the upper part of the right column 2, adjust the angle as needed to meet the stability requirements of the reaction frame.

[0040] S4 Install stress monitoring sensors 10 and displacement monitoring sensors 11 on the reaction frame body;

[0041] Specifically, install stress monitoring sensors 10 and displacement monitoring sensors 11 on the reaction frame and ensure that they can accurately monitor the stress and deformation of the reaction frame during operation. At the same time, debug and calibrate the monitoring devices to ensure their accuracy.

[0042] During the initial launch of the shield machine, the stress monitoring sensor 10 and the displacement monitoring sensor 11 are used to monitor the stress and deformation conditions of the reaction frame in real time, and the monitoring data is analyzed and evaluated, and records and reports are made.

[0043] Specifically, after the installation of the reaction frame is completed, a comprehensive safety inspection and quality acceptance are carried out. Check whether the connections between the components are firm and reliable, whether the support strength of the diagonal braces is appropriate, whether the monitoring devices are operating normally, etc. Ensure that the reaction frame meets the design requirements and construction safety requirements. During the initial launch of the shield machine, the stress monitoring sensor 10 and the displacement monitoring sensor 11 are used to monitor the stress and deformation conditions of the reaction frame in real time. Analyze and evaluate the monitoring data. If abnormal conditions or conditions that do not meet the design requirements are found, adjustments and repairs are made in a timely manner to ensure construction safety and the stability of the reaction frame. Record in detail the various data, problems found, and solutions taken during the installation and inspection process, and compile a complete installation and inspection report. This report should be used as part of the construction data for reference in subsequent construction and maintenance.

[0044] The above-disclosed is only a preferred embodiment of the reaction frame and the installation and inspection method for the secondary initial launch of the shield in a limited space cave of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A secondary initial reaction frame for a shield machine in a limited space tunnel, characterized in that: It includes a reaction frame, a lifting ring, a prefabricated concrete block base, a plurality of left diagonal braces, a plurality of right diagonal braces and a concrete lining; The reaction frame is welded to the prefabricated concrete block base, the lifting ring is installed on the tunnel lining structure, one end of the plurality of left diagonal braces is respectively connected to the reaction frame, and the other end thereof is respectively welded to the embedded steel plate of the guide platform, one end of the plurality of right diagonal braces is respectively connected to the reaction frame, and the other end thereof is respectively connected to the concrete lining.

2. The secondary initial reaction frame of the shield machine in a limited space hole as claimed in claim 1, characterized in that: The reaction frame includes a top crossbeam, a right column, a bottom crossbeam and a left column. The left column is installed on the prefabricated concrete block base, the top crossbeam is installed on the left column, the bottom crossbeam is installed on the side of the left column away from the top crossbeam, and the right column is installed on the side of the bottom crossbeam away from the left column.

3. The secondary initial reaction frame of the shield machine in a limited space hole as claimed in claim 2, characterized in that: The dimensions of the prefabricated concrete block base are 1300×1500×350 mm, and a steel plate of 1000×1000×20 mm is embedded inside the prefabricated concrete block base.

4. The secondary initial reaction frame of the shield machine in a limited space hole as claimed in claim 1, characterized in that: The left diagonal brace and the right diagonal brace both adopt a telescopic steel support structure with a telescopic range of 0.5m to 1.5m, which can be adjusted according to the specific conditions of the internal space of the tunnel.

5. The secondary initial reaction frame of the shield machine in a limited space hole as claimed in claim 1, characterized in that: The reaction frame is provided with a stress monitoring sensor and a displacement monitoring sensor, and the stress monitoring sensor and the displacement monitoring sensor are used to monitor the stress and deformation of the reaction frame in real time during operation.

6. A method for installing and detecting a secondary initial reaction frame of a shield machine in a limited space hole, used for the secondary initial reaction frame of a shield machine in a limited space hole as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Pre-install lifting rings on the tunnel lining structure and place the precast concrete block base at the predetermined position; Use aerial platform and electric hoist to hoist each part of the reaction frame onto the prefabricated concrete block base, and then weld and assemble them; According to the specific conditions of the tunnel's internal space and the requirements of the eccentric starting angle, adjust the telescopic length and angle of the left and right diagonal braces; Install stress monitoring sensors and displacement monitoring sensors on the reaction frame; During the start-up process of the shield machine, stress monitoring sensors and displacement monitoring sensors are used to monitor the stress and deformation of the reaction frame in real time, and the monitoring data are analyzed and evaluated, recorded and reported.

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