Assembly suitable for shield launching of street crossing channel of subway station

Abstract

The utility model relates to the technical field of tunnel engineering, particularly discloses an assembly suitable for subway station crossing channel shield launching, and remarkably improves the efficiency and safety of subway crossing channel shield launching through optimization of construction site layout and structural innovation. According to the scheme, an existing middle plate main body structure is reserved, a reserved pit slot is formed, a shield main machine is borne through permanent and temporary combination, traditional temporary support building is omitted, the construction period is greatly shortened, and material waste is reduced; the design that a single pit slot is provided with a reaction frame is adopted, multi-tunnel split launching is achieved in a limited underground space, and the risk of multi-machine synchronous operation is avoided; hoisting equipment is arranged close to a road and is arranged on two sides of a muck pool / material storage yard, so that the operation radius of the truck crane covers a key area, and the transfer efficiency is improved in a narrow site; the transverse trolley layout breaks through the limitation of a long and narrow site, a split tunneling scheme is adopted, matched equipment does not need to be repeatedly hoisted in short tunnel construction, the construction period is shortened, and the method is particularly suitable for receiving well size limited scenes.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering, and more specifically, to an assembly suitable for shield tunneling initiation in subway station pedestrian crossings. Background Technology

[0002] With the acceleration of urbanization, the scale of subway construction is constantly expanding. Factors such as geological conditions, underground space environment, and surface site conditions place increasingly higher demands on the technical and economic aspects of subway construction. Among various subway construction scenarios, the initial excavation of subway pedestrian underpasses presents particularly significant challenges. One reason is that surface traffic flow is much higher, preventing construction from encroaching on roads, while the available space on both sides of the road is relatively narrow, making the use of gantry cranes impossible and requiring a high level of site layout. Secondly, multiple tunnels often need to be excavated simultaneously around pedestrian underpasses, further compressing surface and underground space, making it difficult to simultaneously accommodate tunneling equipment and its supporting systems underground. Thirdly, the shield tunneling for pedestrian underpasses often needs to start from the middle slab height rather than the bottom slab height. Because the tunneling equipment is heavy and has a large starting reaction force, full-span scaffolding or even a temporary middle slab is required as the shield tunneling starting platform, resulting in longer construction time and impacting the project schedule.

[0003] Therefore, there is an urgent need to develop a mature and complete construction plan that can effectively utilize the construction site and underground space, simplify the construction of the shield tunneling launch platform, take into account the launch requirements of multiple tunnels, thereby reducing the risk of shield tunneling launch at subway stations and shortening the construction period. Utility Model Content

[0004] The present invention aims to overcome at least one of the shortcomings of the prior art and provide an assembly suitable for shield tunneling initiation in subway station pedestrian crossings, which can adapt to narrow ground sites and limited underground spaces, ensuring the safety of multi-tunnel initiation while shortening the construction period.

[0005] The technical solution adopted by this utility model is to provide an assembly suitable for shield tunneling initiation in subway station pedestrian crossings, including a launching shaft set on one side of the road and a receiving shaft set on the other side of the road.

[0006] The subway station is provided with a base slab and a middle slab, the middle slab extending from the rear side to the front side of the starting shaft;

[0007] The launching shaft is equipped with a launching platform, which includes a launching frame and a reaction frame to support the tunnel boring machine. The launching frame is fixed to the base plate, and the reaction frame is mounted on the launching frame.

[0008] The middle plate is provided with multiple reserved slots with a length not greater than the length of the launching shaft and a width less than the diameter of the shield machine, and only one of the multiple reserved slots is equipped with a reaction frame.

[0009] The launching platform provided by this utility model does not remove all the middle plate inside the launching shaft, but retains most of the middle plate structure, only excavating a reserved pit to accommodate the tunnel boring machine (TBM). This utilizes the existing middle plate as a supporting foundation, eliminating the need for traditional full-span scaffolding or temporary middle plate construction, which helps shorten construction time and reduce material waste. During the TBM launching process, the permanent middle plate and the temporary launching platform share the load, enhancing structural stability. The pit design simplifies the subsequent TBM installation steps, avoiding repeated adjustments to the middle plate structure. When excavating multiple tunnels at the middle plate height, multiple reserved pits are provided, and the TBM launches independently in one of these reserved pits. Because the reaction force of a single TBM launch is large, multiple launches cannot be simultaneous; therefore, only one of the multiple reserved pits is equipped with a reaction frame to reduce safety hazards.

[0010] Furthermore, temporary supports are provided laterally in the reserved pits where no reaction frame is installed. This is to enhance the overall strength of the middle plate and prevent the launching platform from being unable to withstand the initial reaction force due to missing parts of the reserved pits.

[0011] Furthermore, the assembly for shield tunneling in subway station pedestrian crossings also includes hoisting equipment located between the launching shaft and the road. Due to high ground traffic volume preventing road occupancy for construction, and the relatively narrow available space on both sides of the road, construction sites often present a long and narrow shape parallel to the road, and gantry cranes are generally not feasible. Therefore, placing the hoisting equipment between the launching shaft and the road maximizes the utilization of the hoisting radius of equipment such as truck cranes.

[0012] The assembly for shield tunneling in subway station pedestrian crossings also includes a spoil heap and a material storage yard, located on the left and right sides of the launching shaft, respectively. Since the longest-running task for hoisting equipment during launching and tunneling is the transfer of spoil and materials, placing the spoil heap and material storage yard on the left and right sides of the launching shaft maximizes the coverage of these two areas by the hoisting radius, improving transfer efficiency and saving construction time.

[0013] Furthermore, the assembly for shield tunneling starting in subway station pedestrian crossings also includes a trolley area. The trolley area is located on the side of the starting shaft away from the hoisting equipment, and is equipped with a bridge and multiple trolleys. The bridge is used to carry the main pipeline, and the main pipeline is used to connect the trolleys and the shield machine located in the starting shaft.

[0014] Furthermore, the multiple trolleys are arranged laterally parallel to the starting well or road. Since construction sites are often long and narrow, parallel to the road, arranging the multiple trolleys in this manner helps save space.

[0015] Furthermore, the trolley area is equipped with additional pipelines to extend the main pipeline; the distance between the launching shaft and the receiving shaft does not exceed twice the total length of the multiple trolleys. Due to the short underground space, it is difficult to simultaneously install the tunneling equipment and its supporting systems. Therefore, a separate launching and fully separate tunneling scheme is adopted. That is, during the launching and tunneling of the tunnel boring machine (TBM), the main pipeline connecting the TBM and the trolley is continuously extended through additional pipelines. This scheme avoids two hoisting operations for the subsequent lowering and exiting of the supporting shafts, which not only reduces the downtime of the TBM during the process of passing under important roads and lowers the construction risk, but also shortens the construction period by about 5 days. In addition, this scheme is particularly suitable for the launching and tunneling of short tunnels, as well as for TBM reception with a small receiving shaft opening. Taking the pedestrian crossing of an urban rail transit station as an example, on the one hand, its receiving shaft is small in size, making it difficult to lift the trolley out; on the other hand, the overall length of the pedestrian crossing is limited, which cannot accommodate multiple trolleys and will not bring the side effect of reduced pumping pressure due to excessively long pipelines. Therefore, it is suitable to adopt a scheme of split starting and full-process split tunneling.

[0016] Furthermore, the assembly suitable for shield tunneling in subway station pedestrian crossings also includes a ground cooling pool, a mid-plate cooling pool, and a booster pump connected in sequence via water supply pipelines, with the booster pump connected to the shield machine. To mitigate the side effect of reduced pumping pressure due to excessively long pipelines, a mid-plate cooling pool and a booster pump are provided to increase pumping pressure and ensure the supply of cooling water to the shield machine.

[0017] Furthermore, the top of the launching frame is lower than the middle plate and fixedly connected to the middle plate, and the reaction frame is mounted on the launching frame, the top of the launching frame being lower than the middle plate and fixedly connected to the middle plate.

[0018] This utility model provides an assembly suitable for shield tunneling launch in subway station pedestrian underpasses. Through optimized construction site layout and structural innovation, it significantly improves the efficiency and safety of shield tunneling launch in subway pedestrian underpasses. Its beneficial effects are reflected in:

[0019] 1) Retain the existing main structure of the middle plate and precisely set the reserved pits, which not only uses a combination of permanent and temporary structures to support the shield machine, but also eliminates the need for traditional temporary support construction, which greatly shortens the construction period and reduces material waste;

[0020] 2) The single-pit configuration reaction frame design enables the separate launching of multiple tunnels within a limited underground space, avoiding the risks of simultaneous operation of multiple machines and improving construction safety;

[0021] 3) The hoisting equipment is arranged close to the road and on both sides of the slag pit / material storage yard, so that the working radius of the truck crane covers the key area and maximizes the transfer efficiency under the constraints of narrow space.

[0022] 4) The transverse trolley layout and split tunneling scheme break through the limitations of narrow sites. Combined with the main pipeline extension technology, the construction of short tunnels does not require repeated hoisting of supporting equipment, shortening the construction period by 5 days. It is especially suitable for scenarios where the size of the receiving shaft is limited.

[0023] 5) A three-stage cooling system is set up to compensate for pump pressure loss through pressurization of the middle plate, ensuring the continuous and stable operation of the tunnel boring machine.

[0024] This solution comprehensively addresses the conflict between limited construction space and multiple parallel operations in the urban core area, achieving multi-dimensional optimization of shield tunneling in terms of safety, schedule, and cost. Attached Figure Description

[0025] Figure 1 This is a layout diagram of the launching site for the high-altitude shield tunneling launching platform provided in Example 1.

[0026] Figure 2 This is a longitudinal section view of the high-altitude shield tunneling launching platform provided in Example 1.

[0027] Figure 3 This is a schematic diagram of the temporary support for the right-line trench when the left line starts launching.

[0028] Figure 4 This is a cross-sectional schematic diagram of the shield tunneling machine and its supporting equipment during the initial launch and tunneling process of Example 1.

[0029] Numbering Explanation: Launching Shaft 100, Bottom Slab 110, Middle Slab 120, Reserved Pit 121, Temporary Support 122, Shield Tunneling Machine 130, Reactor Frame 200, Launching Frame 300, Lifting Equipment 410, Slag Pit 420, First Material Stockpile 430, Second Material Stockpile 440, Trolley Area 450, Bridge Frame 451, Trolley 452, Main Pipeline 453, Road 500, Station Functional Area 600, Other Tunnel Construction Areas 700. Detailed Implementation

[0030] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] The present invention will now be further described with reference to specific examples. The following embodiments are only for explaining the present invention and do not constitute a limitation thereof. Unless otherwise specified, the tools, building materials, etc. used in the following embodiments can be obtained commercially.

[0032] Example

[0033] like Figures 1-4 As shown, this embodiment provides an assembly suitable for shield tunneling initiation in subway station pedestrian crossings, including a launching manhole 100 located on one side of road 500 and a receiving manhole located on the other side of road 500;

[0034] The subway station is provided with a base plate 110 and a middle plate 120, the middle plate 120 extending from the rear side to the front side of the starting shaft 100;

[0035] The launching shaft 100 is equipped with a launching platform, which includes a launching frame 300 and a reaction frame 200 for supporting the tunnel boring machine. The launching frame 300 is fixed to the base plate 110, and the reaction frame 200 is mounted on the launching frame 300.

[0036] The middle plate 120 is provided with a plurality of reserved slots 121 with a length not greater than the length of the launching shaft 100 and a width less than the diameter of the shield machine host 130, and only one of the plurality of reserved slots 121 is provided with a reaction frame 200.

[0037] The launching platform provided by this utility model does not remove all the middle plates 120 within the launching shaft 100, but retains most of the structure of the middle plates 120, only excavating reserved pits 121 to accommodate the tunnel boring machine (TBM). This utilizes the existing middle plates 120 as a supporting foundation, eliminating the need for traditional full-span scaffolding or temporary middle plates 120 construction, which helps shorten construction time and reduce material waste. During the TBM launching process, the permanent structure middle plates 120 and the temporary launching platform share the load, enhancing structural stability. The pit design simplifies the subsequent TBM installation steps, avoiding repeated adjustments to the middle plate 120 structure. When excavating multiple tunnels at the height of the middle plates 120, multiple reserved pits 121 are provided, and the TBM 130 launches independently in one of the reserved pits 121. Because the reaction force of a single TBM launching is large, multiple launches cannot be simultaneous; therefore, only one of the multiple reserved pits 121 is equipped with a reaction frame 200 to reduce safety hazards.

[0038] Temporary supports 122 are provided laterally in the reserved pit 121 where the reaction frame 200 is not provided. This is used to enhance the overall strength of the middle plate 120 and to prevent the launching platform from being unable to withstand the initial reaction force due to the absence of the reserved pit 121.

[0039] The assembly for shield tunneling in subway station pedestrian crossings also includes a hoisting device 410 located between the launching shaft 100 and the road 500. Due to the large volume of ground traffic, construction cannot be carried out on the road. Under the pressure of the road 500, the station functional area 600, and other tunnel construction areas 700, the construction site presents a long and narrow shape parallel to the road 500, making it impossible to use a gantry crane. Therefore, placing the hoisting device 410 between the launching shaft 100 and the road 500 is beneficial to maximizing the hoisting radius of the hoisting device 410, such as a truck crane.

[0040] The assembly for shield tunneling in subway station pedestrian crossings also includes a spoil heap 420 and a first material storage yard 430, located on the left and right sides of the launching shaft 100, respectively. Since the longest-running task for the hoisting equipment 410 during launching and tunneling is the transfer of spoil and materials, placing the spoil heap 420 and the first material storage yard 430 on the left and right sides of the launching shaft 100 maximizes the coverage of these two areas by the hoisting radius, improving transfer efficiency and saving construction time. In addition, a second material storage yard 440 is provided outside the hoisting radius. Materials from this yard are transported to the side of the launching shaft 100 by small vehicles and then hoisted into the launching shaft 100 by the hoisting equipment 410.

[0041] The assembly for shield tunneling starting in a subway station pedestrian crossing also includes a trolley area 450, which is located on the side of the starting shaft 100 away from the hoisting equipment 410. The trolley area 450 is equipped with a bridge frame 451 and multiple trolleys 452. The bridge frame 451 is used to support the main pipeline 453, and the main pipeline 453 is used to connect the trolleys 452 and the shield machine host 130 located in the starting shaft 100.

[0042] The multiple trolleys 452 are arranged laterally parallel to the starting manhole 100 or the road 500. Since the construction site is often long and narrow in shape and parallel to the road 500, arranging the multiple trolleys 452 in this manner helps to save site space.

[0043] The trolley area 450 is also equipped with additional pipelines to extend the main pipeline 453; the distance between the launching shaft 100 and the receiving shaft does not exceed twice the total length of the multiple trolleys 452. Due to the short underground space, it is difficult to simultaneously install the tunneling equipment and its supporting systems. Therefore, a separate launching and fully separate tunneling scheme is adopted. That is, during the launching and tunneling of the tunnel boring machine (TBM), the main pipeline 453 connecting the TBM and the trolleys 452 is continuously extended through additional pipelines. This scheme avoids two hoisting operations for the subsequent lowering and exiting of the supporting equipment, which not only reduces the downtime of the TBM during the process of passing under important roads and lowers the construction risk, but also shortens the construction period by about 5 days. In addition, this scheme is particularly suitable for the launching and tunneling of short tunnels, as well as for TBM reception with a small receiving shaft opening. Taking the pedestrian crossing of an urban rail transit station as an example, on the one hand, its receiving shaft is small in size, making it difficult to lift out the trolley 452; on the other hand, the overall length of the pedestrian crossing is limited, which cannot accommodate multiple trolleys 452, and will not bring the side effect of reduced pumping pressure due to excessive pipeline length. Therefore, it is suitable to adopt a scheme of split starting and full-process split tunneling.

[0044] The assembly for tunnel boring machine (TBM) launching in subway station pedestrian crossings also includes a ground cooling tank, a central plate 120 cooling tank, and a booster pump connected in sequence via a water supply pipeline. The booster pump is connected to the TBM host 130. To mitigate the side effect of reduced pumping pressure due to excessively long pipelines, the central plate 120 cooling tank and the booster pump are installed to increase pumping pressure and ensure the supply of cooling water to the TBM host 130.

[0045] The top of the launching frame 300 is lower than the middle plate 120 and is fixedly connected to the middle plate 120. The reaction frame 200 is disposed on the launching frame 300, and the top of the launching frame 300 is lower than the middle plate 120 and is fixedly connected to the middle plate 120.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An assembly for shield tunneling initiation in a pedestrian crossing of a subway station, comprising a launching shaft located on one side of the road and a receiving shaft located on the other side of the road; The subway station is provided with a base slab and a middle slab, the middle slab extending from the rear side to the front side of the starting shaft; The launching shaft is equipped with a launching platform, which includes a launching frame and a reaction frame to support the tunnel boring machine. The launching frame is fixed to the base plate, and the reaction frame is mounted on the launching frame. Its features are, The middle plate is provided with multiple reserved slots with a length not greater than the length of the launching shaft and a width less than the diameter of the shield machine, and only one of the multiple reserved slots is equipped with a reaction frame.

2. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 1, characterized in that, Temporary supports are provided laterally in the reserved pits where no reaction frame is installed.

3. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 1, characterized in that, It also includes hoisting equipment located between the starting well and the road.

4. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 1, characterized in that, It also includes a slag pit and a material storage yard, located on the left and right sides of the launching well, respectively.

5. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 3, characterized in that, It also includes a trolley area, which is located on the side of the launching shaft away from the hoisting equipment. The trolley area is equipped with a bridge and multiple trolleys. The bridge is used to carry the main pipeline, and the main pipeline is used to connect the trolleys and the shield tunneling machine located in the launching shaft.

6. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 5, characterized in that, The multiple trolleys are arranged in a transverse layout parallel to the starting well or road.

7. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 5, characterized in that, The trolley area is also equipped with additional pipelines to extend the main pipeline.

8. The assembly for shield tunneling starting in a subway station pedestrian crossing as described in claim 5, characterized in that, The distance between the launching well and the receiving well shall not exceed twice the total length of the multiple trolleys.

9. An assembly for shield tunneling starting in a pedestrian underpass at a subway station, as described in any one of claims 1 to 8, characterized in that, It also includes a ground cooling pool, a middle plate cooling pool, and a pressurization pump connected in sequence via water supply pipelines, with the pressurization pump connected to the tunnel boring machine.

10. An assembly for shield tunneling starting in a subway station pedestrian crossing, as described in any one of claims 1 to 8, characterized in that, The top of the launching frame is lower than the middle plate and is fixedly connected to the middle plate. The reaction frame is mounted on the launching frame, and the top of the launching frame is lower than the middle plate and is fixedly connected to the middle plate.

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