Large-diameter shield tunnel segment secondary lining edge inverted arch construction formwork trolley and construction method

Abstract

The application provides a template trolley for large-diameter shield tunnel segment secondary lining side inverted arch construction and a construction method. The template trolley comprises a portal trolley steel frame, a trolley running system, a side inverted arch template, a template lifting mechanism, a template positioning mechanism and a measuring system. The side inverted arch template comprises two groups of symmetrical arc-shaped templates arranged on the two sides of the portal trolley steel frame. The two arc-shaped templates are connected with the portal trolley steel frame through template supports. Pouring openings are arranged on the two arc-shaped templates. Pipeline suspension frames are arranged on the two side template supports. The lifting mechanism comprises two groups of symmetrical lifting oil cylinders arranged on the two vertical supports of the portal trolley steel frame. The template positioning mechanism comprises multiple groups of supporting oil cylinders which are arranged on the arc-shaped templates and used for positioning the arc-shaped templates. The application can realize the synchronous construction of the secondary lining of the side inverted arch area of the shield segment and the shield tunneling construction, saves the construction period, and is safer and more economical.

Description

Technical Field

[0001] This invention belongs to the field of shield tunneling construction, specifically a formwork trolley and construction method for the construction of the invert arch of the secondary lining of large-diameter shield tunnel segments in slurry shield tunneling, earth pressure shield tunneling, and TBM tunnel construction. Background Technology

[0002] In shield tunneling, slurry shields, because the medium is slurry, need to be continuously transported from the ground to the excavation chamber through slurry pipes, and then transported to the ground for separation through slurry discharge pipes. Earth pressure / TBM shields conventionally use continuous belt conveyor or hopper transport, so slurry inlet and outlet pipes or continuous belt conveyors need to be suspended on the segments inside the shield tunnel at all times. Moreover, since shield construction requires the use of external circulating water for cooling, high-voltage power lines for construction, sewage discharge, etc., also need to be suspended through the segments. In conventional secondary lining construction for large-diameter shield tunnels, all pipelines and auxiliary supports are suspended on the tunnel segments inside the tunnel. After the shield advances about 200 meters, the segments on both sides of the box culvert are roughened, the steel bars are tied, and the formwork is erected manually before concrete is poured. Once the concrete reaches the required strength, the mud pipes / continuous conveyor belts, circulating water pipes, various high-voltage cables and wires, lighting and related switch boxes on the segments are relocated to both sides of the box culvert for re-layout and fixation. After the pipeline relocation is completed, the secondary lining construction above the box culvert surface is carried out.

[0003] Under existing construction methods, during the construction of the secondary lining (i.e., side invert arch) areas on both sides of the box culvert, the location of pipelines needs to be changed. If the tunnel boring machine (TBM) continues to operate, the flow of mud, water, and air in the mud pipe / continuous conveyor belt, water pipe, and air pipe will increase the weight of the pipes. If they are not secured, they are prone to shaking, making it impossible for the pipes to work stably and thus affecting the TBM tunneling work. Therefore, in order not to affect the TBM tunneling work, it is necessary to stop the machine during the construction of the side invert arch. Generally, the relocation of pipelines / continuous conveyor belts requires a shutdown of at least 5-3 days, which has a significant impact on the construction period. Summary of the Invention

[0004] This invention addresses the problems existing in the background art by providing a template trolley and construction method for the construction of variable invert arch in the secondary lining of shield tunnel segments. The construction structure and method can be used for the side invert arch construction of large-diameter slurry shield tunnels, earth pressure shield tunnels, and TBM tunnels. It enables the secondary lining construction of the side invert arch area of ​​the segment to be completed during the non-stop tunneling of large-diameter shield tunnels, allowing the secondary lining of the segment to be carried out simultaneously with the shield tunneling process, saving construction time and meeting construction requirements.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a formwork trolley for the construction of the side invert arch of the secondary lining of a shield tunnel segment. The formwork trolley includes a portal trolley steel frame, a trolley traveling system, side invert arch formwork, a formwork lifting mechanism, a formwork positioning mechanism, and a measuring system. The side invert arch formwork includes two sets of arc-shaped formwork symmetrically arranged on both sides of the portal trolley steel frame. The two arc-shaped formworks are respectively connected to the portal trolley steel frame via formwork supports. Pouring inlets are provided on the two arc-shaped formworks, and pipeline suspension brackets are respectively provided on the formwork supports on both sides. The lifting mechanism includes two sets of symmetrically arranged on the portal trolley... The gantry trolley steel frame has two vertical supports for lifting cylinders. The upper and lower parts of the gantry trolley steel frame are connected by lifting cylinders. The template support is installed on the upper part of the gantry trolley steel frame and can drive the template support and the arc template to be lifted during the lifting process of the lifting cylinders. The measuring system includes a clear distance measuring instrument respectively set at the ends of the two template supports near the inner wall of the shield tunnel segment to control the lateral position of the side arch construction template trolley. The template positioning mechanism includes multiple sets of support cylinders, which are distributed on the arc template and used to position the arc template.

[0006] The preferred technical solution of the present invention is as follows: the template trolley is slidably connected to the trolley track laid on the top of the box culvert in the middle of the segment through the trolley travel system, and moves along the trolley track. The two sets of template supports and the arc-shaped template are symmetrically located on both sides of the middle box culvert.

[0007] The preferred technical solution of the present invention is as follows: the arc-shaped template matches the curvature of the shield tunnel segment, and the area covered by each arc-shaped template matches the side arch area to be constructed on both sides of the central box culvert; multiple pouring ports are arranged on each arc-shaped template, and the pouring ports are arranged in groups from top to bottom, with each group including multiple pouring ports set at the same height.

[0008] The preferred technical solution of the present invention is as follows: the template support includes a horizontal support frame and multiple vertical support frames perpendicular to the horizontal support frame. One end of each vertical support frame is fixedly connected to the horizontal support frame, and the other end is vertically downward connected to the arc-shaped template. The pipeline suspension frame is a hanging ring or hook, which is set on the horizontal support frame, and the pipeline suspension frame is used in conjunction with a manual or electric hoist to suspend the pipelines / belts used in shield tunneling.

[0009] The preferred technical solution of the present invention is as follows: the trolley traveling system is provided with two sets of vertical support rods symmetrically arranged at the bottom of the gantry trolley steel frame, and multiple diagonal braces are provided between the transverse support frame and the vertical support rod of the gantry trolley steel frame.

[0010] The preferred technical solution of the present invention is as follows: The template positioning mechanism is provided in two sets, symmetrically distributed on two arc-shaped templates. Each set of template positioning mechanisms includes a first template support cylinder, a second template support cylinder, a third template support cylinder, and a template support cylinder. One end of the first template support cylinder is fixed to the bottom of the middle box culvert, and the other end is fixed to the arc-shaped template. One end of the second template support cylinder is fixed to the top of the middle box culvert, and the other end is fixed to the arc-shaped template. The first template support cylinder and the second template support cylinder are arranged at a 90-degree angle. One end of the third template support cylinder is fixed to the steel frame of the gantry trolley, and the other end is fixed to the middle of the arc-shaped template through a bracket. One end of the template support cylinder is fixed to the top of the template support, and the other end is fixed to the top of the steel frame of the gantry trolley. The second template support cylinder, the third template support cylinder, and the template support cylinder are parallel to each other.

[0011] To achieve the above-mentioned technical objectives, the present invention also provides a method for constructing the secondary lining invert arch of a shield tunnel segment. The method utilizes the aforementioned shield tunnel segment secondary lining invert arch construction template trolley, and its specific construction steps are as follows:

[0012] (1) Construction of the middle box culvert and installation of tunnel ventilation ducts; the box culvert is assembled simultaneously during the slurry shield tunneling process, and the slurry pipe of the shield machine trolley is arranged horizontally, with the bottom of the slurry pipe 0.6 to 0.8 m higher than the top surface of the box culvert; at the same time, the double ventilation ducts for tunnel ventilation are arranged inside the box culvert;

[0013] (2) The suspended parts on both sides of the box culvert after the shield tunneling machine exits the No. 4 trolley are laid with temporary pipeline supports. The temporary pipeline supports are 0.6 to 0.8 m high. One end of each temporary pipeline support is fixed to the upper surface of the box culvert on both sides, and the other end is fixed to the tunnel segment. The pipelines and belts used for shield tunneling in the tunnel are fixed on the temporary pipeline supports. The distance between the fixed pipelines and the inner wall of the shield segment is not less than 1 m.

[0014] (3) Construction of the arched side arches on both sides of the middle box culvert: First, install the matching side arch construction template trolley. After the shield tunneling is completed for one kilometer and the segment floating is basically stable, install the template trolley track on the top surface of the box culvert according to the design position, and assemble the portal steel frame of the side arch construction template trolley and the template supports on both sides. Control the template trolley to walk along the track into the tunnel. When the side arch construction template trolley walks to the position of the temporary pipeline support in step (2), remove the shield tunneling pipeline and belt from the temporary pipeline support and hang them on the pipeline suspension frame of the template support. Start dismantling the temporary pipeline support in the side arch construction area until the side arch construction template trolley is completely located in the side arch construction area. Install the two side arch templates on the two template supports respectively.

[0015] (4) Positioning of the formwork trolley and concrete pouring for the side arch construction; Adjust the lateral position of the trolley by using two distance measuring instruments on both sides of the formwork trolley so that the formwork trolley is in the middle of the tunnel; Then adjust the side arch formwork on both sides to the design position, and seal the end cap formwork at both ends of each side arch formwork. The side arch formwork and the end cap formwork form a pouring cavity that matches the arc side arch. Fix the formwork by using the formwork positioning mechanism on both sides. Then pour and vibrate the concrete through the pouring port on the side arch formwork from front to back and from bottom to top to complete the construction of the arc side arch in this section.

[0016] (5) After the concrete of the side arch constructed in step (4) reaches the demolding condition, the side arch formwork is removed from the concrete surface, and the shield construction pipeline and belt are removed from the pipeline suspension frame. The side arch construction formwork trolley continues to move forward. After the side arch construction formwork trolley moves forward, the temporary pipeline support is immediately installed again in the area where the side arch construction is completed, and the shield construction pipeline and belt are fixed on the temporary pipeline support again for subsequent construction.

[0017] The preferred technical solution of the present invention is as follows: the length of the side arch construction template trolley in step (4) is 12m, and the construction area is 12m each time. The side arch template matches the curvature of the shield tunnel segment, and the distance between the outer surface of the side arch template and the inner wall of the shield tunnel segment is 0.3m to 0.5m. The sealing strip is installed at the position of the end cap template close to the segment to prevent mud from flowing out during the concrete pouring process. After each pouring port is vibrated and sealed, the next pouring port is poured, and both sides are poured at the same time until the entire section of concrete is poured.

[0018] The preferred technical solution of the present invention is as follows: the temporary pipeline support structure and installation position in steps (2) and (5) are the same, and channel steel support is used; one end of the two temporary pipeline supports in step (2) is fixed on both sides of the box culvert, and the other end is fixed on the tunnel segment; one end of the two temporary pipeline supports in step (5) is fixed on both sides of the box culvert, and the other end is fixed on the cast-in-place arc-shaped inverted arch.

[0019] The preferred technical solution of the present invention is as follows: the pipelines for shield tunneling in step (2) include mud pipes, cables, water pipes and air pipes during shield tunneling.

[0020] The secondary lining structure of the tunnel segment side arch area in this invention features a specially designed side arch construction formwork trolley, taking into account the placement of the shield tunneling pipeline. This solves the problems of side arch formwork erection and shield tunneling pipeline installation during construction, resolving the frequent shutdowns and pipeline / belt relocation issues encountered in traditional slurry, earth pressure, and TBM shield tunneling. It is the first invention to achieve simultaneous secondary lining construction for large-diameter shield tunnels without shutting down the machine. This invention enables fully mechanized rapid formwork erection for the secondary lining of the shield segment side arch area, simultaneously with shield tunneling. The fully automated formwork erection replaces traditional manual formwork, resulting in faster construction, reduced construction time, and safer, more economical construction that meets requirements. This invention offers advantages such as simple process, low construction cost, controllable schedule, and flexible process adjustments. It is applicable to long-distance, large-diameter shield tunneling and parallel secondary lining construction projects, significantly shortening the construction period. Attached Figure Description

[0021] Figure 1 This is a front structural diagram of the side arch formwork trolley in this invention;

[0022] Figure 2 This is a side structural diagram of the side arch formwork trolley in this invention;

[0023] Figure 3 This is a structural schematic diagram of the arc-shaped inverted arch before construction of the present invention;

[0024] Figure 4 and Figure 5 This is a schematic diagram of the construction process of the arc-shaped inverted arch of the present invention;

[0025] Figure 6 This is a schematic diagram of the construction plan of the arc-shaped inverted arch in this invention;

[0026] Figure 7 This is a schematic diagram of the sealing template during the construction of the arc-shaped inverted arch in this invention;

[0027] Figure 8 This is a schematic diagram of the structure after the construction of the arc-shaped inverted arch in this invention.

[0028] In the diagram: 1—Tunnel segment, 2—Central box culvert, 3—Arched side invert, 4—Side invert formwork trolley, 400—Arched formwork, 401—Formwork support, 402—Pipeline suspension frame, 403—Gantry trolley steel frame, 404—Pouring port, 405—Clear distance measuring instrument, 406—Traveling system, 407—Trolley track, 408—End formwork, 409—First formwork support cylinder, 410—Second formwork support cylinder, 411—Formwork support cylinder, 412—Third formwork support cylinder, 413—Inclined brace, 5—Pipelines for shield tunneling, 6—Temporary pipeline support, 7—Tunnel ventilation duct. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 8 All accompanying drawings are simplified versions of embodiments and are intended only to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to 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 limitations on this invention.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0032] Example 1 provides a formwork trolley for the construction of the invert arch of the secondary lining of a slurry shield tunnel segment, such as... Figures 1 to 5 As shown, the template trolley 4 includes a portal trolley steel frame 403, a trolley traveling system 406, an inverted arch template, a template lifting mechanism, a template positioning mechanism, and a measuring system. The template trolley 4 is slidably connected to the trolley track 407 located on the top of the box culvert 2 in the middle of the tunnel segment via the trolley traveling system 406, and moves along the trolley track 407. The template support 401 includes a horizontal support frame and multiple vertical support frames perpendicular to the horizontal support frame. One end of each vertical support frame is fixedly connected to the horizontal support frame, and the other end is vertically downward connected to the arc-shaped template 400. The trolley traveling system 406 has two sets, symmetrically arranged at the bottom of the vertical support rods of the portal trolley steel frame 403, and multiple diagonal braces 413 are provided between the horizontal support frame and the vertical support rod of the portal trolley steel frame 403.

[0033] Example 1 provides a formwork trolley for the construction of the invert arch of the secondary lining of a slurry shield tunnel segment, such as... Figures 1 to 5 As shown, the side arch formwork includes two sets of symmetrically arranged arc-shaped formwork 400 on both sides of the portal trolley steel frame 403. The two arc-shaped formwork 400 are connected to the portal trolley steel frame 403 through formwork supports 401. The arc-shaped formwork 400 matches the curvature of the shield tunnel segment 1, and the area covered by each arc-shaped formwork 400 matches the side arch area to be constructed on both sides of the central box culvert 2. Pouring ports 404 are provided on the two arc-shaped formwork 400, and multiple pouring ports 404 are arranged on each arc-shaped formwork 400. The pouring ports 404 are arranged in groups from top to bottom, and each group includes multiple pouring ports 404 set at the same height. The two sets of template supports 401 and the arc-shaped template 400 are symmetrically located on both sides of the central box culvert 2. Pipeline suspension frames 402 are respectively provided on the template supports 401 on both sides. The pipeline suspension frames 402 have hanging rings or hooks, which are set on the horizontal support frame. The pipeline suspension frames 402 are used in conjunction with manual or electric hoists to suspend the pipelines 5 and belts used for shield tunneling.

[0034] Example 1 provides a formwork trolley for the construction of the invert arch of the secondary lining of a slurry shield tunnel segment, such as... Figures 1 to 5As shown, the lifting mechanism includes two sets of lifting cylinders 408 symmetrically arranged on the two vertical supports of the gantry trolley steel frame 403. The upper and lower parts of the gantry trolley steel frame 403 are connected by the lifting cylinders 408. The template support 401 is installed on the upper part of the gantry trolley steel frame 403, and can drive the template support 401 and the arc template 400 to be lifted during the lifting process of the lifting cylinders 408. The measuring system includes a net distance measuring instrument 405 respectively set at the ends of the two template supports 401 near the inner wall of the shield tunnel segment to control the lateral position of the side arch construction template trolley. The template positioning mechanism includes multiple sets of support cylinders, which are distributed on the arc template 400 and used to position the arc template 400. The template positioning mechanism consists of two sets, symmetrically distributed on the two arc-shaped templates 400. Each set of template positioning mechanisms includes a first template support cylinder 409, a second template support cylinder 410, a third template support cylinder 412, and a template support cylinder 411. One end of the first template support cylinder 409 is fixed to the bottom of the middle box culvert 2, and the other end is fixed to the arc-shaped template 400. One end of the second template support cylinder 410 is fixed to the top of the middle box culvert 2, and the other end is fixed to the arc-shaped template 400. 0, and the first template support cylinder 409 and the second template support cylinder 410 are arranged at 90 degrees; one end of the third template support cylinder 412 is fixed on the gantry trolley steel frame 403, and the other end is fixed to the middle of the arc template 400 through the bracket; one end of the template support cylinder 411 is fixed to the top of the template support 401, and the other end is fixed to the top of the gantry trolley steel frame 403, and the second template support cylinder 410, the third template support cylinder 412 and the template support cylinder 411 are parallel to each other.

[0035] In this embodiment, temporary pipeline supports 6 are also required during construction. The tunnel boring machine (TBM) pipelines 5 include slurry pipes, cables, water pipes, and air pipes used during TBM construction. Figure 4 As shown, the temporary pipeline support 6 is made of channel steel. Before the construction of the curved side invert 3, the temporary pipeline support is horizontally erected on both sides of the central box culvert 2, and the shield tunneling pipeline 5 is laid on the temporary pipeline support 6. The height of the temporary pipeline support 6 is 0.6m to 0.8m, and the distance between the pipeline fixed on the temporary pipeline support and the inner wall of the tunnel segment 1 is not less than 1m. At this time, one end of the temporary pipeline support 6 is fixed to the side of the central box culvert 2, and the other end is fixed to the tunnel segment 1. When the curved side invert 3 is constructed, the temporary pipeline support 6 is removed. After the construction of the curved side invert 3 is completed, but before the cast-in-place lane slab is installed, the pipeline can be temporarily supported again by the temporary pipeline support 6. At this time, one end of the temporary pipeline support 6 is fixed to the side of the central box culvert 2, and the other end is fixed to the curved side invert 3.

[0036] Example 2 describes the construction of a railway shield tunnel section. The tunnel's internal structure mainly consists of a prefabricated intermediate box culvert, prefabricated side lap slabs, cast-in-place secondary lining, and cast-in-place structures. The total length of the shield tunnel section is 6230m, with a designed construction period of 1150 days. The installation and dismantling of the large-diameter shield machine takes about 5 months, leaving only 1000 days for effective tunneling, resulting in significant pressure on the shield construction schedule. The side arch location of this project includes two 500mm diameter mud pipes, two 150mm high-voltage cables, three 150mm diameter water pipes, and cables of other diameters. To achieve simultaneous secondary lining and shield construction within the tunnel segments, the amount of overlapping construction is substantial, making the construction organization and difficulty extremely high.

[0037] The existing construction process for large-diameter shield tunnels involves assembling tunnel segments and intermediate box culverts simultaneously during the excavation process. The intermediate box culverts serve as horizontal transport channels within the tunnel. All pipelines and auxiliary supports used in shield tunneling are suspended on the tunnel segments inside the tunnel. After the initial excavation of 200m, the roadway slabs on both sides of the tunnel and other secondary structures are constructed simultaneously. Since the medium in slurry shield tunnels is slurry, it needs to be continuously transported from the ground to the excavation chamber through slurry pipes. Then, the excavated soil is transported to the ground for separation through slurry discharge pipes. Two large slurry inlet pipes and slurry discharge pipes need to be suspended on the tunnel segments inside the shield tunnel at all times. External circulating water is required for cooling during shield construction. High-voltage power lines for construction and sewage discharge also need to be suspended through the tunnel segments. If secondary lining is required, these pipes and lines must be removed before construction can proceed. Therefore, conventional secondary lining construction for large-diameter shield tunnels involves roughening the tunnel segments on both sides of the box culvert, binding reinforcing bars, and manually erecting formwork after the shield has advanced approximately 200 meters. Concrete is then poured, and once the concrete reaches the required strength, the slurry pipes, circulating water pipes, various high-voltage cables and wires, lighting, and related switch boxes on the tunnel segments are relocated to the sides of the box culvert for relocation and fixation. This pipeline relocation requires a 5-3 day shutdown, significantly impacting the construction schedule. Secondary lining construction above the box culvert surface is then carried out after the pipeline relocation is completed. This project involves a long railway tunneling distance; proceeding with secondary lining construction after tunneling completion would result in a long construction period that cannot meet the project schedule. To shorten the construction period, the project team proposed the synchronous construction method for tunnel segment secondary lining during large-diameter slurry shield tunneling, as described in this invention.

[0038] In response to the engineering characteristics and difficulties of this construction project, a side arch formwork trolley was specifically developed and designed. It can meet the requirements of horizontal transportation, passing, concrete road blockage during secondary lining construction, and safe working space. It ensures that the secondary lining and shield tunneling are constructed simultaneously. In addition, the tunnel structure spatial layout is different from conventional construction, avoiding the need for secondary adjustments to the spatial arrangement of shield tunneling pipelines, which saves both pipeline modification time and pipeline overlay costs. For the secondary lining structure, the manual formwork erection process is eliminated, improving construction efficiency.

[0039] In Example 2, the side arch construction formwork trolley 4 from Example 1 is used for construction. The specific construction process is as follows:

[0040] (1) Construction of box culverts and installation of tunnel ventilation ducts; The box culverts are assembled simultaneously during shield tunneling, and the mud pipes of the shield machine trolley are arranged horizontally, with the bottom of the mud pipes 0.6 to 0.8 m higher than the top surface of the box culverts; At the same time, the DN1400 double ventilation ducts for tunnel ventilation are arranged inside the box culverts; This project has carried out targeted design and modification of the shield machine mud pipe replacement device and platform so that the bottom of the mud pipes is 0.3 m higher than the box culvert surface; After the construction of the middle box culvert 2 is completed, guardrails and lighting strips are installed on both sides of the middle box culvert 2, and the lighting strips are installed on the guardrails.

[0041] (2) The suspended portions on both sides of the box culvert where the shield tunneling machine exits the No. 4 trolley are laid using temporary pipeline supports 6, such as... Figure 3 As shown, the temporary pipeline support 6 is 0.3m high. One end of each temporary pipeline support 6 is fixed to the upper surface of the box culvert on both sides, and the other end is fixed to the tunnel segment 1. The pipelines used for shield tunneling in the tunnel are fixed on the temporary pipeline support 6. The distance between the fixed pipelines and the inner wall of the shield segment is not less than 1m. In order to increase construction safety, guardrails and lighting strips can also be installed on both sides of the middle box culvert 2.

[0042] (3) Construction of the arched side inverts on both sides of the central box culvert: First, install the matching side invert construction formwork trolley 4, such as Figure 4 As shown, the side arch formwork includes two sets of symmetrically arranged arc-shaped formwork 400 on both sides of the portal trolley steel frame. The two arc-shaped formwork 400 are connected to the portal trolley steel frame 403 through formwork supports 401. Pouring ports 404 are opened on the two arc-shaped formwork 400. Pipeline suspension brackets 402 are respectively provided on the formwork supports 401 on both sides. A clear distance measuring instrument 405 is located at the end of the two formwork supports 401 near the inner wall of the shield tunnel segment to control the lateral position of the side arch construction formwork trolley. After the shield tunneling is completed for one kilometer, the settlement of the tunnel segment is basically stable, and the side arch construction begins. For the construction of the invert arch, firstly, the guardrails and lighting strips on both sides of the central box culvert 2 are removed, and the template trolley track 407 is laid on the top surface of the central box culvert 2 according to the design position. Then, the portal trolley steel frame 403 and the template supports 401 on both sides of the side invert arch construction template trolley 4 are assembled. After the portal trolley steel frame 403 and the template supports 401 of the template trolley are installed, the side invert arch construction template trolley 4 travels into the tunnel along the track through its walking system 406. When the side invert arch construction template trolley 4 travels to the position of the temporary pipeline support 6 in step (2), such as Figure 4 and Figure 5As shown, the pipelines used in shield tunneling are removed from the temporary pipeline supports and suspended on the pipeline suspension frame 402 of the formwork support 401. Generally, only the mud pipes and water pipes with larger diameters and weights need to be suspended on the formwork support 401. The suspension process uses a manual hoist or an electric hoist, and during the suspension process, the pipelines are kept in their original positions or slightly above their original positions to keep the mud pipes and water pipes stable during operation. This prevents the mud pipes and water pipes from shaking due to the liquid inside the pipes during operation, which would affect the normal operation of the pipelines. Since the cable is relatively light and only a portion of the temporary pipeline support 6 is being removed, there is no need to suspend the cable. After the mud pipe and water pipe are suspended, the temporary pipeline support 6 in the side arch construction area can be dismantled, so that the entire side arch construction template trolley 4 is located in the area excluding the side arch construction area. The two side arch arc templates are then installed on the two template supports 401 respectively. The side arch construction template trolley is 12m long, and its construction area is 12m each time. The side arch template matches the curvature of the shield tunnel segment, and the distance between the outer surface of the side arch arc template 400 and the inner wall of the shield tunnel segment 1 is 0.4m (i.e., the side arch thickness is 0.4m).

[0043] (4) Positioning of the formwork trolley and concrete pouring for the side arch construction; the lateral position of the formwork trolley is adjusted by using two distance measuring instruments 409 on both sides of the formwork trolley to position the formwork trolley in the middle of the tunnel, such as... Figure 6 As shown; then adjust the two side arched formwork sections 400mm to the designed position, as shown. Figure 7 As shown, end cap templates 408 are sealed at both ends of each side arch template. The end cap templates 408 are fitted with sealing strips close to the pipe segments to prevent slurry from flowing out during concrete pouring. The side arch arc templates 400 and end cap templates 408 form a pouring cavity that matches the arc side arch. The templates are reinforced and inspected by the hydraulic cylinders of the template trolley. Then, the concrete is poured and vibrated sequentially from front to back and from bottom to top through the pouring port 404 on the side arch arc template 400 to complete the construction of this section of the arc side arch. Each pouring port is sealed after vibration before the next pouring port is poured, and both sides are poured simultaneously until the entire section of concrete is poured.

[0044] (5) Advancement of the formwork trolley for the side invert arch construction and reinstallation of temporary pipeline supports; after the concrete of the side invert arch in step (6) reaches the demolding conditions, such as Figure 5As shown, the lifting cylinder 408 of the side arch construction template trolley 4 drives the side arch arc template 400 to detach from the concrete surface of the poured arc side arch 3, and removes the shield construction pipeline 5 from the pipeline suspension frame of the template support 401. The side arch construction template trolley 4 continues to move forward along the track. After the side arch construction template trolley 4 moves forward, the temporary pipeline support 6 is immediately installed again in the area where the side arch construction is completed, and the shield construction pipeline 5 is fixed on the temporary pipeline support 6 again. The temporary pipeline support 6 has the same structure and installation position as the temporary pipeline support 6 in step (2). At this time, one end of the temporary pipeline support 6 is fixed on both sides of the box culvert, and the other end is fixed on the poured arc side arch 3. The temporary pipeline support 6 and the middle box culvert 2 can be connected by a slot. In order to increase its stability, it can also be fixed by bolts after being connected. The other end of the temporary pipeline support 6 and the arc side arch 3 can be fixed by the reserved bolts. The relay pump and its supporting equipment were installed on the processing platform at the designated relay pump (slurry inlet and outlet) installation point.

[0045] (6) Lane slab construction; after the completion of the arc-shaped inverted arch 3, lay precast slabs in the area. One side of the precast slab is placed on the corbel of the box culvert, and the other side is placed on the corbel of the arc-shaped inverted arch. After the precast slabs are installed, tie the reinforcing bars of the lane slabs on both sides of the box culvert, install the lane slab pouring template, and pour the lane slabs. During the lane slab construction process, gradually remove the temporary pipeline support 6 in step (5).

[0046] The above description is merely one embodiment of the present invention, and while it is quite specific and detailed, it should not be construed as limiting the scope of the invention. For earth pressure shield tunneling and TBM shield tunneling segment box culverts with fewer pipelines on both sides, the side arch trolley of this invention can be directly used for construction. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for constructing a large-diameter shield tunnel segment secondary lining edge inverted arch, characterized in that: The construction method uses a large-diameter shield tunnel segment secondary lining side inverted arch construction formwork trolley to carry out construction, the formwork trolley (4) comprises a portal trolley steel frame (403), a trolley running system (406), side inverted arch formworks, a formwork lifting mechanism, a formwork positioning mechanism and a measuring system, the side inverted arch formworks comprise two groups of symmetrical arc-shaped formworks (400) arranged on the two sides of the portal trolley steel frame (403), the two arc-shaped formworks (400) are connected with the portal trolley steel frame (403) through formwork supports (401) respectively, pouring openings (404) are formed in the two arc-shaped formworks (400), and pipeline suspension frames (402) are arranged on the two formwork supports (401) respectively; the lifting mechanism comprises two groups of symmetrical lifting oil cylinders (408) arranged on the two vertical supports of the portal trolley steel frame (403), the upper part and the lower part of the portal trolley steel frame (403) are connected through the lifting oil cylinders (408), the formwork supports (401) are installed on the upper part of the portal trolley steel frame (403) and can drive the formwork supports (401) and the arc-shaped formworks (400) to be lifted in the lifting process of the lifting oil cylinders (408); the measuring system comprises clearance measuring instruments (405) arranged adjacent to the inner wall end portions of the shield segments on the two formwork supports (401) respectively, so as to control the transverse position of the side inverted arch construction formwork trolley; and the formwork positioning mechanism comprises a plurality of groups of supporting oil cylinders which are arranged on the arc-shaped formworks (400) in a scattered manner and are used for positioning the arc-shaped formworks (400); The specific construction steps are as follows: (1) construction of the middle box culvert and installation of the tunnel air pipe; the box culvert is assembled synchronously during the shield construction, the mud pipe of the shield machine trolley is arranged horizontally, the bottom of the mud pipe is 0.6-0.8 m higher than the top surface of the box culvert, and the double air pipes for tunnel ventilation are arranged in the box culvert; (2) the suspended part of the box culvert on the two sides of the No. 4 trolley is laid by using temporary pipeline supports, the temporary pipeline supports are 0.6-0.8 m high, one end of the two temporary pipeline supports is fixed on the upper surface of the box culvert on the two sides respectively, and the other end is fixed on the tunnel segment; the pipeline and the belt for tunnel shield construction are fixed on the temporary pipeline supports, and the spacing between the fixed pipelines and the inner wall of the shield segment is not less than 1 m; (3) construction of the arc-shaped side inverted arch on the two sides of the middle box culvert; after the shield construction is completed for one kilometer and the segment floating is basically stable, the formwork trolley track is installed on the top surface of the box culvert according to the design position, the portal trolley steel frame of the side inverted arch construction formwork trolley and the formwork supports on the two sides are assembled, the formwork trolley is controlled to walk into the hole along the track, the pipeline and the belt for shield construction are removed from the temporary pipeline supports and are hung on the pipeline suspension frames of the formwork supports when the side inverted arch construction formwork trolley walks to the position of the temporary pipeline supports in step (2), the temporary pipeline supports in the side inverted arch construction area are removed, the side inverted arch construction formwork trolley is located in the side inverted arch construction area, and the two side inverted arch formworks are installed on the two formwork supports respectively; (4) The side inverted arch construction formwork trolley is positioned and concrete is poured; the lateral positions of the formwork trolley are adjusted through two distance measuring instruments on the two sides of the formwork trolley, so that the formwork trolley is located in the middle of the tunnel; then the side inverted arch formworks on the two sides are adjusted to the design positions, and end closure formworks are sealingly installed at the two ends of each side inverted arch formwork, a pouring cavity matching the arc-shaped side inverted arch is enclosed through the side inverted arch formworks and the end closure formworks, the formworks are fixed through the formwork positioning mechanisms on the two sides, and then concrete is poured from front to back and from bottom to top through the pouring openings in the side inverted arch formworks, so that the side inverted arch construction in this section is completed; (5) After the side inverted arch concrete in step (4) is constructed and reaches the demolding condition, the side inverted arch formworks are separated from the concrete surface, the shield construction pipelines and belts are removed from the pipeline suspension frames, the side inverted arch construction formwork trolley continues to advance, the temporary pipeline supports are immediately installed again in the area where the side inverted arch construction is completed after the side inverted arch construction formwork trolley advances, the shield construction pipelines and belts are fixed on the temporary pipeline supports again, and subsequent construction is performed.

2. The construction method for the secondary lining invert arch of a large-diameter shield tunnel segment as described in claim 1, characterized in that: The formwork trolley (4) is slidingly connected with the trolley track (407) arranged on the top of the middle box culvert (2) through a trolley walking system (406) and moves along the trolley track (407), and the two groups of formwork supports (401) and arc-shaped formworks (400) are symmetrically located on the two sides of the middle box culvert (2).

3. The method according to claim 1 or 2, characterized in that: The arc-shaped formworks (400) match the curvature of the shield tunnel segment (1), and the area covered by each arc-shaped formwork (400) matches the side inverted arch area to be constructed on the two sides of the middle box culvert (2); a plurality of pouring openings (404) are arranged on each arc-shaped formwork (400), and the pouring openings (404) are arranged in groups from top to bottom, and each group includes a plurality of pouring openings (404) arranged at the same height.

4. The method according to claim 1 or 2, characterized in that: The formwork support (401) includes a horizontal support frame and a plurality of vertical support frames perpendicular to the horizontal support frame, one end of the plurality of vertical support frames is fixedly connected with the horizontal support frame, and the other end is connected with the arc-shaped formwork (400) vertically downward; the pipeline suspension frame (402) is a hanging ring or a hook, which is arranged on the horizontal support frame, and the pipeline suspension frame (402) cooperates with a manual or electric hoist to suspend the shield construction pipeline (5).

5. The method according to claim 1 or 2, characterized in that: The trolley walking system (406) is provided with two groups of vertical support rods symmetrically arranged at the bottom of the door-shaped trolley steel frame (403), and a plurality of inclined support frames (413) are arranged between the horizontal support frame and the vertical support rods of the door-shaped trolley steel frame (403).

6. The construction method for the secondary lining invert arch of a large-diameter shield tunnel segment according to claim 2, characterized in that: The template positioning mechanism is provided with two groups, which are symmetrically distributed on the two arc-shaped templates (400). Each group of template positioning mechanisms comprises a first template support oil cylinder (409), a second template support oil cylinder (410), a third template support oil cylinder (412) and a template support bracket support oil cylinder (411). One end of the first template support oil cylinder (409) is fixed to the bottom of the middle box culvert (2), and the other end is fixed to the arc-shaped template (400). One end of the second template support oil cylinder (410) is fixed to the top of the middle box culvert (2), and the other end is fixed to the arc-shaped template (400). The first template support oil cylinder (409) and the second template support oil cylinder (410) are arranged at an angle of 90 degrees. One end of the third template support oil cylinder (412) is fixed to the door-shaped trolley steel frame (403), and the other end is fixed to the middle part of the arc-shaped template (400) through a bracket. One end of the template support bracket support oil cylinder (411) is fixed to the top of the template support bracket (401), and the other end is fixed to the top of the door-shaped trolley steel frame (403). The second template support oil cylinder (410), the third template support oil cylinder (412) and the template support bracket support oil cylinder (411) are parallel to each other.

7. The construction method for the secondary lining invert arch of a large-diameter shield tunnel segment as described in claim 1, characterized in that: The length of the side inverted arch construction formwork trolley in step (4) is 12 m, and the construction area of each time is 12 m. The side inverted arch formwork matches the curvature of the shield tunnel segment, and the distance between the outer surface of the side inverted arch formwork and the inner wall of the shield tunnel segment is 0.3 m to 0.5 m. A sealing strip is arranged at the position of the end cap formwork close to the segment to prevent mud from flowing out during the concrete pouring process. After each pouring opening is vibrated and closed, the next pouring opening is poured, and both sides are poured at the same time until the entire section of concrete pouring is completed.

8. The method according to claim 1, wherein the method further comprises the steps of: providing a second lining segment; and connecting the second lining segment to the first lining segment. The temporary pipeline support structures in steps (2) and (5) are the same in installation position and adopt channel steel supports. One end of the two temporary pipeline supports in step (2) is fixed to the sides of the box culvert, and the other end is fixed to the tunnel segment. One end of the two temporary pipeline supports in step (5) is fixed to the sides of the box culvert, and the other end is fixed to the already poured arc-shaped side inverted arch.

9. The construction method for the secondary lining invert arch of a large-diameter shield tunnel segment according to claim 1, characterized in that: The pipeline for shield construction in step (2) comprises mud pipes, cables, water pipes and gas pipes used in the shield construction process.

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