Middle partition wall construction method suitable for double-arch tunnel

Abstract

The invention discloses a mid-partition wall construction method suitable for a double-arch tunnel. The mid-partition wall construction method comprises the steps that a guide rail assembly is positioned on an arch wall; the guide rail assembly is installed at the set position of the arch wall, and the guide rail assembly is reinforced through the guide rail supporting assembly; the formwork trolley is in sliding fit with the guide rail assembly through a roller assembly, and concrete is poured between adjacent steel formworks installed on the formwork trolley in the sliding process of the formwork trolley to form a mid-partition wall; the structure that the guide rail assembly used for sliding of the formwork trolley is arranged on the arch wall is adopted, the problem that the construction precision is insufficient due to reference deviation and unstable supporting in a traditional technology can be solved, potential quality hazards of follow-up main tunnel construction are eliminated, and the safety and structural stability of mid-partition wall construction are enhanced; and meanwhile, the operation process is simplified, the labor cost and the material cost are reduced, and the construction efficiency is improved on the basis that it is guaranteed that the construction quality is accurate and controllable.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a method for constructing the central partition wall of a double-arch tunnel. Background Technology

[0002] The central partition wall of a twin-arch tunnel, as the core component separating the two tunnels, transferring loads, and ensuring structural stability, directly impacts the overall stress balance of the tunnel and the quality of subsequent main tunnel construction due to its construction precision. However, due to objective conditions such as narrow tunnel cross-sectional space or limited construction equipment layout, the quality and precision control of the pre-construction procedures for the central partition wall faces numerous challenges. Furthermore, limitations in material properties and construction techniques mean that areas such as the connection between the central partition wall and the arch wall, and construction joints, are prone to insufficient construction precision due to installation benchmark deviations and unstable support systems. This, in turn, affects the overall integrity and long-term safety of the tunnel structure. Simultaneously, the construction of the central partition wall needs to provide a precise benchmark for subsequent main tunnel construction, requiring high precision in its verticality, flatness, and connection with surrounding structures. Therefore, this has driven the development of central partition wall construction technology for twin-arch tunnels.

[0003] Existing construction techniques for the central partition walls of twin-arch tunnels primarily rely on traditional methods such as leveling the bottom concrete cushion and laying steel guide rails as the benchmark for formwork installation. These methods have several shortcomings. For example, the flatness of the concrete cushion itself is prone to variations, resulting in insufficient adhesion between the concrete cushion and the steel guide rails. This fails to provide a stable and precise support benchmark for the formwork trolley, leading to severely inaccurate construction precision for the central partition wall. Furthermore, the steel guide rails are simply laid and fixed, lacking a coordinated reinforcement structure with the tunnel arch walls, making them prone to displacement or deformation during construction and increasing installation deviations. The formwork trolley relies on a single track support, lacking a dual safety redundancy design, resulting in insufficient construction safety. The connection between the central partition wall construction and the initial tunnel support structure lacks a pre-designed structure, limiting the precise control of track positioning and formwork verification during installation and failing to offset the impact of construction errors and structural deformation. In addition, the equipment used in traditional construction has poor on-site adaptability, and some components are difficult to reuse, increasing construction costs and reducing efficiency.

[0004] Therefore, it is necessary to improve the existing construction technology of the central partition wall in the double-arch tunnel. This can not only solve the problem of insufficient construction accuracy caused by benchmark deviation and unstable support in the traditional process, and eliminate the quality risks of subsequent main tunnel construction, but also enhance the safety and structural stability of the central partition wall construction. It can also improve the on-site adaptability and reusability of construction equipment, simplify the operation process, reduce labor and material costs, and improve construction efficiency while ensuring accurate and controllable construction quality. Summary of the Invention

[0005] In view of the shortcomings of current construction technology for the central partition wall in twin-arch tunnels, the purpose of this invention is to provide a construction method for the central partition wall in twin-arch tunnels. This method not only solves the problems of insufficient construction accuracy caused by benchmark deviation and unstable support in traditional processes, eliminating potential quality hazards in subsequent main tunnel construction, and enhancing the safety and structural stability of the central partition wall construction, but also improves the on-site adaptability and reusability of construction equipment. At the same time, it simplifies the operation process, reduces labor and material costs, and improves construction efficiency while ensuring precise and controllable construction quality.

[0006] The present invention provides a method for constructing a central partition wall in a twin-arch tunnel, comprising the following steps:

[0007] S1. Fabricate the guide rail assembly, guide rail support assembly, and roller assembly, and position the guide rail assembly on the arch wall;

[0008] S2. Install the guide rail assembly at the designated position on the arch wall, and reinforce the guide rail assembly with the guide rail support assembly;

[0009] S3. The template trolley slides between the roller assembly and the guide rail assembly. During the sliding process of the template trolley, concrete is poured between the adjacent steel templates installed on the template trolley to form a partition wall.

[0010] Furthermore, in step S2, the guide rail assembly includes a first guide rail and a second guide rail, both of which are arranged along the entire length of the arch wall, with the first guide rail located above the second guide rail.

[0011] Furthermore, the first guide rail and the second guide rail each include a guide rail and a guide rail limiting plate. The guide rail is a channel steel structure, which includes a channel steel base plate and a channel steel side plate. The guide rail limiting plate is located on the outer edge of the channel steel side plate and is fixed to the channel steel side plate by welding, and adjacent guide rail limiting plates are directly opposite each other.

[0012] Furthermore, the guide rail support assembly includes a first guide rail support and a second guide rail support. The first guide rail support is located at the lower part of the first guide rail and is fixedly connected to the side wall of the arch wall, while the second guide rail support is located at the lower part of the second guide rail and is fixed to the ground.

[0013] Furthermore, the second guide rail support includes a support rod and a support base plate. The bottom surface of the support rod is fixed to the support base plate by welding, and the bottom surface of the channel steel side plate of the second guide rail overlaps the top surface of the support rod and is fixed by welding.

[0014] Furthermore, the bottom surface of the channel steel side plate of the first guide rail overlaps the top surface of the first guide rail support and is fixed by welding, and the bottom plate of the channel steel of the first guide rail is installed on the side wall of the arch wall.

[0015] Furthermore, in step S3, the roller assembly includes rollers and a transverse bearing, and the rollers are rotatably coupled to the transverse support of the template trolley via the transverse bearing.

[0016] Furthermore, the transverse support portion of the template trolley includes a transverse support column and a bearing mounting rod located at the end of the transverse support column. The bearing mounting rod passes through the inner ring of the transverse bearing and rotates with the roller.

[0017] Furthermore, it also includes a roller limiting plate, which is fixedly connected to the end of the bearing mounting rod. After the steel template is installed in place, the roller limiting plate is tightly attached to the inner surface of the channel steel base plate.

[0018] Furthermore, there are multiple first guide rail support members, which are evenly distributed along the length of the first guide rail;

[0019] The second guide rail support consists of multiple components, which are evenly distributed along the length of the second guide rail.

[0020] The beneficial effects of this invention are as follows: The present invention provides a method for constructing the central partition wall of a double-arch tunnel. By using a structure with a guide rail assembly for sliding the template trolley on the arch wall, it not only solves the problem of insufficient construction accuracy caused by benchmark deviation and unstable support in traditional processes, eliminating potential quality hazards in subsequent main tunnel construction, and enhancing the safety and structural stability of the central partition wall construction, but also improves the on-site adaptability and reusability of construction equipment. At the same time, it simplifies the operation process, reduces labor and material costs, and improves construction efficiency while ensuring precise and controllable construction quality. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the completed structure of the central partition wall construction method applicable to double-arch tunnels according to the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0025] Figure 4 This is a side view of the present invention.

[0026] Reference numerals: 1. Guide rail assembly; 101. First guide rail; 102. Second guide rail; 103. Guide rail limiting plate; 104. Channel steel base plate; 105. Channel steel side plate; 2. Guide rail support assembly; 201. First guide rail support component; 202. Second guide rail support component; 2021. Support rod; 2022. Support base plate; 3. Roller assembly; 301. Roller; 4. Arch wall; 5. Template trolley; 501. Transverse support part; 502. Transverse support column; 503. Bearing mounting rod; 504. Roller limiting plate; 6. Steel template; 7. Drive motor. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0028] This invention discloses a method for constructing a central partition wall suitable for twin-arch tunnels, comprising the following steps:

[0029] S1. Fabricate guide rail assembly 1, guide rail support assembly 2, and roller assembly 3, and position guide rail assembly 1 on arch wall 4; before positioning guide rail assembly 1, clean the initial sprayed concrete at the connection of arch wall 4, and treat the wall surface of arch wall 4 with hollow areas and insufficient density. The initial layout in the existing technology can be used to locate and determine the installation range of guide rail assembly 1, and then accurately lay out the layout, and mark the installation position and height of guide rail assembly 1 at arch wall 4. This will not be elaborated here.

[0030] S2. Install the guide rail assembly 1 at the designated position on the arch wall 4, and reinforce the guide rail assembly 1 with the guide rail support assembly 2; the setting of the guide rail support assembly 2 can prevent the guide rail assembly 1 from shifting or deforming during construction, ensure that the verticality and flatness of the central partition wall meet the actual construction requirements, reduce the impact on the quality of subsequent main tunnel construction, and after reinforcing the guide rail assembly 1, the accuracy of the guide rail assembly 1 can also be checked, which will not be elaborated here;

[0031] S3. The template trolley 5 slides with the guide rail assembly 1 via the roller assembly 3. During the sliding process, the template trolley 5 pours concrete between the adjacent steel templates 6 installed on the template trolley 5 to form a partition wall. This method can achieve continuous one-time concrete pouring, avoiding the splicing problem caused by the layered and segmented pouring required by the existing small template assembly construction. This makes the partition wall form a complete force system with more uniform and reasonable force distribution, improving its ability to resist lateral pressure during the excavation of the main tunnel. The template trolley 5 is customized according to the design dimensions of the partition wall and slides along the guide rail assembly 1 via the roller assembly 3. The positioning is accurate during the sliding process, which can effectively avoid the positional deviation problem that is easy to occur when manually assembling templates. Generally, templates need to be disassembled, transported and stacked manually piece by piece. In the narrow space of the pilot tunnel in the double arch tunnel, this process is not only time-consuming and labor-intensive, but also easily interferes with other processes. In this embodiment, the template trolley 5 can slide as a whole along the guide rail assembly 1 via the roller assembly 3, without repeated disassembly and assembly, and pouring while sliding, shortening the construction cycle.

[0032] In this embodiment, in step S2, the guide rail assembly 1 includes a first guide rail 101 and a second guide rail 102. Both the first guide rail 101 and the second guide rail 102 are arranged along the entire length of the arch wall 4, and the first guide rail 101 is located above the second guide rail 102. The upper and lower guide rails can limit the formwork trolley 5 at two points, constructing a stable vertical support system, distributing the lateral pressure to the first guide rail 101, the second guide rail 102, and the stress points of the arch wall 4, effectively avoiding problems such as formwork running or grout leakage caused by excessive pressure during the pouring process. The space in the pilot tunnel of the double-arch tunnel is narrow, and the formwork trolley 5 moves when... The stability of the template directly affects the alignment accuracy. The first guide rail 101 and the second guide rail 102 cooperate with the roller assembly 3, which is equivalent to setting up double insurance for the template trolley 5, avoiding the jamming or offset problems that are prone to occur with single-layer guide rails. The first guide rail 101 and the second guide rail 102 can be installed in place at one time after the initial support of the central guide hole is completed, without the need for repeated disassembly and adjustment. Compared with the traditional distributed template support, this structure reduces the temporary support erection process, and the guide rails can be used as the reference for the subsequent positioning of the template trolley 5 after installation, shortening the time for the template trolley 5 to be positioned and debugged, and improving construction efficiency. Further details will not be elaborated here.

[0033] In this embodiment, the first guide rail 101 and the second guide rail 102 each include a guide rail and a guide rail limiting plate 103. The guide rail is a channel steel structure, which includes a channel steel base plate 104 and a channel steel side plate 105. The guide rail limiting plate 103 is located at the outer edge of the channel steel side plate 105 and is fixed to the channel steel side plate 105 by welding. Adjacent guide rail limiting plates 103 face each other. The channel steel is a channel-shaped structure with a channel steel base plate 104 and a channel steel side plate 105. Compared with flat guide rails, it has a larger moment of inertia and stronger bending and torsional resistance. When pouring the partition wall, the vertical pressure transmitted by the formwork trolley 5 and the lateral thrust of the concrete will be distributed to the channel steel base plate 104 and the channel steel side plate 105 through the roller assembly 3. The channel steel structure can easily... The formwork trolley is designed to withstand these loads without easily deforming. The adjacent guide rail limiting plates 103 can constrain the roller assembly 3 of the formwork trolley 5. When the formwork trolley 5 slides, the roller assembly 3 is always within the channel formed by the guide rail limiting plates 103 on both sides, which can effectively avoid lateral displacement caused by the lateral pressure of concrete or the inertia of the formwork trolley 5. At the same time, it can also prevent the risk of the roller assembly 3 derailing. The trough structure can provide a natural sliding channel for the roller assembly 3. The roller assembly 3 is in close contact with the channel steel side plate 105, with low sliding friction. With the auxiliary guidance of the guide rail limiting plates 103 on both sides, the formwork trolley 5 will not jam or deviate when sliding. Even when moving a long distance on the long guide rail, it can remain smooth, reducing the time for positioning and adjusting the formwork trolley 5.

[0034] In this embodiment, the guide rail support assembly 2 includes a first guide rail support 201 and a second guide rail support 202. The first guide rail support 201 is located below the first guide rail 101 and is fixedly connected to the side wall of the arch wall 4. The second guide rail support 202 is located below the second guide rail 102 and is fixed to the ground. The lateral thrust during concrete pouring and the vibration load during the movement of the formwork trolley 5 can be transferred to the arch wall 4 and the ground respectively through the first guide rail support 201 and the second guide rail support 202, thereby improving the overall anti-overturning and anti-deformation capabilities of the guide rail assembly 1 and avoiding problems such as formwork slippage or grout leakage caused by support failure during the pouring process. The positions of the first guide rail 101 and the second guide rail 102 can be precisely controlled. The side wall of the arch wall 4 and the ground can be preset with reference lines. The two guide rail supports 202 are fixed according to the reference, which can quickly ensure the parallelism, perpendicularity and linearity of the first guide rail 101 and the second guide rail 102, avoid the guide rail tilting, and ensure that the template trolley 5 slides along the set trajectory. It also saves space resources in a narrow space. The space of the central guide tunnel is limited. The upper part uses the side wall of the arch wall 4 to install the first guide rail support 201, and the lower part is fixed to the ground. There is no need to set up a large area of ​​scaffolding or support platform, which avoids occupying the space for personnel passage, material transportation and concrete delivery. At the same time, it simplifies the installation and dismantling process. The guide rail support component 2 has a simple structure and can be quickly installed after the initial support of the central guide tunnel and the ground leveling. The upper and lower supports can be operated independently without interfering with each other. After the construction is completed, the guide rail support component 2 is easy to dismantle and will not cause large-scale damage to the arch wall and the ground, reducing subsequent cleaning and repair work.

[0035] In this embodiment, the second guide rail support 202 includes a support rod 2021 and a support base plate 2022. The bottom surface of the support rod 2021 is fixed to the support base plate 2022 by welding. The bottom surface of the channel steel side plate 105 of the second guide rail 102 overlaps the top surface of the support rod 2021 and is fixed by welding, so that the support base plate 2022, the support rod 2021 and the second guide rail 102 form a complete load-bearing unit, rather than a simple splicing of independent parts. This integrated structure can reduce the loads such as the weight of the formwork trolley 5 and the lateral thrust generated by concrete pouring from the first... The two guide rails 102 smoothly transmit the force to the support rod 2021, and then distribute it evenly to the ground through the support base plate 2022, avoiding deformation or damage of components caused by localized force concentration and increasing the load-bearing capacity of the support system. The support base plate 2022 increases the contact area with the ground, which on the one hand reduces the pressure of the support structure on the ground and prevents the support rod 2021 from sinking into the ground under the heavy pressure of the pouring operation. On the other hand, it can also disperse the reaction force of the ground, reduce the risk of tilting and bending of the support rod 2021 due to excessive force at a single point, and ensure the stability of the support. Further details are omitted here.

[0036] In this embodiment, the bottom surface of the channel steel side plate 105 of the first guide rail 101 overlaps with the top surface of the first guide rail support 201 and is fixed by welding. The channel steel bottom plate 104 of the first guide rail 101 is installed on the side wall of the arch wall 4. The channel steel bottom plate 104 installed on the side wall of the arch wall 4 can bear part of the lateral load with the help of the high strength of the arch wall 4. The bottom surface of the channel steel side plate 105 is welded and fixed to the first guide rail support 201, which can transfer the vertical load to the first guide rail support 201. The bidirectional fixation ensures that the first guide rail 101 will not loosen due to force in one direction, enhancing the overall anti-overturning and anti-deformation ability. At the same time, the welded connection ensures that the first guide rail 101 and the first guide rail support 201 are connected. The rail support 201 forms a rigid whole, which can effectively resist the lateral thrust generated during concrete pouring. The dual positioning reduces deviation. The structural position of the side wall of the arch wall 4 is relatively fixed. The channel steel base plate 104 installed here can serve as the reference surface for positioning the first guide rail 101. Combined with the secondary fixing welded to the first guide rail support 201, the position of the first guide rail 101 can be restricted from both horizontal and vertical dimensions. This dual positioning method can effectively ensure the linearity of the first guide rail 101 and its parallelism with the second guide rail 102 below, thereby ensuring that the template trolley 5 slides smoothly along the preset trajectory and avoids problems such as uneven thickness of the partition wall and surface unevenness caused by guide rail deviation.

[0037] In this embodiment, in step S3, the roller assembly 3 includes a roller 301 and a transverse bearing. The roller 301 and the transverse support part 501 of the template trolley 5 are rotatably engaged through the transverse bearing. The transverse bearing can convert the sliding friction between the roller 301 and the template trolley 5 into rolling friction. The coefficient of friction of rolling friction is much smaller than that of sliding friction, which reduces the resistance when the template trolley 5 moves. On the one hand, it makes it easier to adjust the pouring position of the template trolley 5, and it can be easily pushed without the need for high-power drive equipment, which is suitable for the complex working environment in the tunnel. On the other hand, the low friction characteristic can reduce energy loss during operation. This reduces heat generated by friction, prevents components from deforming due to high temperatures, ensures the stability of the formwork trolley 5 during long-term continuous operation, and improves the overall construction progress. When the formwork trolley 5 is in operation, it not only has to bear its own weight, but also is subjected to loads in multiple directions, such as the lateral thrust generated by concrete pouring and vibration during operation. The transverse bearing is usually a cross-type transverse bearing, with its internal rollers arranged in a cross-shaped structure, which can simultaneously bear radial, axial and torque loads. This characteristic allows the roller assembly 3 to evenly distribute the complex loads transmitted from the formwork trolley 5, avoiding localized force concentration that could cause the rollers 301 to jam or be damaged. This will not be elaborated further here.

[0038] In this embodiment, the transverse support part 501 of the template trolley 5 includes a transverse support column 502 and a bearing mounting rod 503 located at the end of the transverse support column 502. The bearing mounting rod 503 passes through the inner ring of the transverse bearing and rotates with the roller 301. The bearing mounting rod 503 is independently designed and can be precisely machined according to the inner ring size of the transverse bearing. This precise fit can prevent the transverse bearing from shaking or shifting during rotation, so that the roller 301 always rotates along the preset trajectory, thereby ensuring the linear accuracy of the template trolley 5 sliding along the guide rail. The transverse support column 502 and the bearing mounting rod 503 can adopt an integrated structure to ensure their perpendicularity and coaxiality, avoiding the problem of roller 301 jamming and uneven force due to component misalignment during operation, making the movement of the template trolley 5 smoother. Of course, a drive motor 7 for driving the template trolley 5 to slide is also provided. The drive motor 7 is an existing drive motor structure, which will not be described in detail here.

[0039] In this embodiment, a roller limiting plate 504 is also included. The roller limiting plate 504 is fixedly connected to the end of the bearing mounting rod 503. After the steel template 6 is installed in place, the roller limiting plate 504 is tightly attached to the inner surface of the channel steel base plate 104. The tight attachment between the roller limiting plate 504 and the inner surface of the channel steel base plate 104 can form a rigid lateral constraint on the template trolley 5. When the steel template 6 is installed in place, the tight attachment between the roller limiting plate 504 and the channel steel base plate 104 can serve as a direct calibration benchmark for the horizontality and verticality of the template trolley 5. By observing the attachment status, construction personnel can quickly determine whether the template trolley 5 is in a horizontal position without the need to use tools such as a level to adjust, thus shortening the debugging time for the steel template 6 to be installed. Further details are omitted here.

[0040] In this embodiment, there are multiple first guide rail supports 201, which are evenly distributed along the length of the first guide rail 101; there are multiple second guide rail supports 202, which are evenly distributed along the length of the second guide rail 102. The even distribution of multiple guide rail supports can distribute the load along the length of the guide rail to various support points, avoiding localized stress concentration caused by sparse guide rail supports. The evenly distributed guide rail supports can form a multi-point lifting effect. By having each guide rail support share part of the load, it ensures that the guide rail always maintains its designed straightness, reducing the sliding and jamming of the formwork trolley 5 or the positional displacement of the steel formwork 6 caused by deformation. For the first guide rail... The support component 201, with its even distribution, can uniformly transfer the load to the side wall of the arch wall 4, preventing local cracking or detachment of the arch wall 4 due to excessive stress. The second guide rail support component 202 can distribute the load to the ground, preventing local ground settlement and further ensuring the overall stability of the guide rail. The evenly distributed guide rail support components can serve as reference points during guide rail installation. By precisely controlling the height and position of each guide rail support component, it is ensured that the guide rail strictly follows the design linearity along its entire length. The multi-point uniform support can more effectively resist the deformation of the guide rail caused by temperature changes or material stress release, maintaining the straightness or curvature of the guide rail over a long period of time, and ensuring the accuracy of the sliding trajectory of the template trolley 5.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for constructing a mid-partition wall suitable for a double-arch tunnel, characterized in that, The method comprises the following steps: S1. manufacturing a guide rail assembly, a guide rail support assembly and a roller assembly, and positioning the guide rail assembly on an arch wall; S2. installing the guide rail assembly at a set position of the arch wall, and reinforcing the guide rail assembly through the guide rail support assembly; S3. sliding the formwork trolley through the sliding cooperation between the roller assembly and the guide rail assembly, and pouring concrete between adjacent steel forms installed on the formwork trolley to form a partition wall during the sliding process of the formwork trolley.

2. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 1, characterized in that: In step S2, the guide rail assembly comprises a first guide rail and a second guide rail, both of which are arranged along the length of the arch wall, and the first guide rail is located above the second guide rail.

3. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 2, characterized in that: The first guide rail and the second guide rail each comprise a guide rail and a guide rail limiting plate, the guide rail is a channel steel structure, the channel steel structure comprises a channel steel bottom plate and a channel steel side plate, the guide rail limiting plate is located at the outer edge of the channel steel side plate and is fixed between the channel steel side plate through welding, and the adjacent guide rail limiting plates face each other.

4. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 2, characterized in that: The guide rail support assembly comprises a first guide rail support and a second guide rail support, the first guide rail support is located at the lower part of the first guide rail and is fixedly connected to the side wall of the arch wall, and the second guide rail support is located at the lower part of the second guide rail and is fixed to the ground.

5. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 4, characterized in that: The second guide rail support comprises a support rod and a support bottom plate, the bottom surface of the support rod is fixed between the support bottom plate through welding, and the bottom surface of the channel steel side plate of the second guide rail is lapped on the top surface of the support rod and is fixed through welding.

6. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 3, characterized in that: The bottom surface of the channel steel side plate of the first guide rail is lapped on the top surface of the first guide rail support and is fixed through welding, and the channel steel bottom plate of the first guide rail is installed on the side wall of the arch wall.

7. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 1, characterized in that: In step S3, the roller assembly comprises a roller and a transverse bearing, and the roller is rotationally connected between the transverse support part of the formwork trolley and the transverse bearing.

8. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 7, characterized in that: The transverse support part of the formwork trolley comprises a transverse support column and a bearing mounting rod located at the end of the transverse support column, the bearing mounting rod penetrates the inner ring of the transverse bearing and rotationally connects with the roller.

9. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 8, characterized in that: A roller limiting plate is further included, which is fixedly connected to the end of the bearing mounting rod, and after the steel form is installed in place, the roller limiting plate tightly abuts against the inner surface of the channel steel bottom plate.

10. The method for constructing a mid-partition wall applicable to a double-arch tunnel according to claim 4, characterized in that: The first guide rail support is a plurality of and is evenly distributed along the length direction of the first guide rail; The second guide rail support is a plurality of and is evenly distributed along the length direction of the second guide rail.

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