Subway tunnel split pump house structure and construction method based on full-whirl full casing

Abstract

This invention discloses a separate pump house structure for subway tunnels and a construction method based on a full-rotation, full-casing system. The separate pump house structure for subway tunnels mainly includes an entrance structural slab, a water-stopping device, a steel casing, a main structure, a ring beam, a cover plate, and a prefabricated pump station. The steel casing is located directly below the subway tunnel and serves as the protective wall between the main structure and the soil. The main structure, located inside the steel casing, is a prefabricated structure. The prefabricated pump station is a complete drainage system, facilitating installation and disassembly. The method mainly includes: using a steel casing with a cutting unit to vertically rotate downwards for cutting and excavation under the drive of a full-rotation device; removing the cut-off segments and excavated soil retained inside the steel casing, leaving the steel casing in place; and installing the main structure inside the steel casing. The beneficial effects of this invention are: the pump house structure is circular, allowing for flexible location, good stability, good durability, easy maintenance, and low cost; and the full-rotation, full-casing construction method ensures safety, efficiency, greenness, and environmental friendliness.

Description

Technical Field

[0001] This invention relates to the field of pump room technology in subway tunnels, and in particular to a separate pump room structure for subway tunnels and a construction method based on a full-rotation, full-casing system. Background Technology

[0002] Wastewater pumping stations in subway tunnel sections are typically located at the lowest point of the tunnel, integrated with connecting passageways. The standard dimensions are approximately 0.8m deep, 0.6m wide, and 14m long. They are primarily used to drain water leaking from the tunnel structure and to handle fire-fighting wastewater. Currently, wastewater pumping stations are generally installed using four methods: submerged pumping stations, externally mounted pumping stations, internally mounted pumping stations, and separate pumping stations.

[0003] 1) Submerged pump house

[0004] In conventional subway tunnels, underground tunnel sections typically employ a combined construction model for wastewater pumping stations and connecting passages, where the connecting passage also houses the wastewater pumping station. This combined connecting passage and wastewater pumping station is generally constructed using the mining method, with the pumping station located directly beneath the connecting passage (referred to as a "submerged pumping station"). Wastewater flows from the central ditch of the track bed through pre-buried pipes to a collection tank, and is then pumped out. Depending on the geological conditions, the soil around the pumping station is reinforced by grouting or freezing. After the connecting passage construction is completed, mining excavation is then carried out.

[0005] 2) External pump house

[0006] The external pump house is located on the side of the shield tunnel section and is constructed using the mining method. The quality of the frozen solidified body is improved by setting up a concrete diaphragm wall.

[0007] 3) Built-in pump room for track bed

[0008] When mechanical excavation is used for connecting passages, a wastewater pumping station integrated into the track bed is typically employed. This involves placing the pumping station in the middle of the main tunnel track bed. Wastewater from within the tunnel flows through drainage ditches, sedimentation tanks, and sump pits, ultimately being discharged by pumps. The pumping station is independently located at the lowest point of the tunnel, and steel segments are usually installed in the main tunnel lining at the location of the wastewater pumping station, using mechanical construction methods.

[0009] 4) Separate pump house

[0010] The separate pump house is located directly below the shield tunnel and is constructed vertically using the pipe jacking method.

[0011] The existing pump house technology has the following problems:

[0012] (1) Submerged pumping station: ① High construction risk. Generally, mining methods are used for construction, and the soil in the excavation area is reinforced by methods such as freezing or grouting. However, the reinforcement effect is difficult to control, and there are safety hazards at the excavation face; ② Inflexible location selection. The design location of the connecting passage and wastewater pumping station must be combined with the lowest point of the line. Therefore, the selection of the line slope and the location of the connecting passage is inflexible, and it is difficult to avoid complex geological conditions.

[0013] (2) External pump room: The mining method is used for construction. The quality of the frozen solid is improved by setting up a concrete diaphragm wall, but the construction cost is high, the safety risk is high, and the construction period is long.

[0014] (3) Built-in pump house: Long-term water accumulation in the track bed, severe corrosion of fasteners, and high maintenance costs. ① Due to the working principle of the submersible sewage pump, it is impossible to completely drain the water. The track bed sump is filled with water for a long time, so the rails, fasteners, vibration isolators and other components are severely corroded; ② Long-term water accumulation may also reduce the insulation performance of the track, resulting in rail sparking, local burning and chipping; ③ Specially selected submersible sewage pumps start frequently, have many failures, and need to be replaced frequently. The equipment also needs to be ordered in advance; ④ The track bed surface is prone to breakage and chipping due to water accumulation; ⑤ It greatly increases the maintenance costs of later operation.

[0015] (4) Separate pumping station: The vertical construction using the pipe jacking method requires the shield tunnel segments to be made of special steel segments, which is costly; the shield tunnel segments are cut across the entire cross section, resulting in a large cutting area that causes significant damage to the main tunnel and poses a high construction risk; and the pumping station needs to be located at the lowest point of the tunnel section, making the location inflexible; in addition, the side walls lack protective measures, making maintenance difficult.

[0016] In summary, existing technologies have many problems. The existing utility model patent with publication number CN215444138U, entitled "A Sunken Pumping Station in a Subway Tunnel," requires secondary lining reinforcement on steel segments, resulting in low mechanization, long construction periods, and difficulties in pumping station maintenance. To address the problems of existing technologies and the shortcomings of existing patents, the following invention is proposed. Summary of the Invention

[0017] The purpose of this invention is to address the shortcomings of existing pump room construction technologies, such as high construction risks and high maintenance costs due to long-term water accumulation in the pump room structure. This invention proposes a separate pump room structure for subway tunnels and a construction method based on a full-turn, full-casing system. The pump room structure is designed as a vertical shaft located directly below the main tunnel and separated from the connecting passage. It features flexible location, good stability, good durability, easy maintenance, and low cost. This pump room structure can be constructed using a full-turn, full-casing method, resulting in high mechanization, high construction efficiency, construction safety, and a green and environmentally friendly approach.

[0018] To achieve this objective, the present invention adopts the following technical solution:

[0019] A separate pumping station structure for a subway tunnel is disclosed. The separate pumping station structure is located at the bottom of the subway tunnel and includes a steel sleeve and a main structure. The steel sleeve forms a pumping station shaft, and the main structure is located on the inner wall of the pumping station shaft. The main structure is used to accommodate the pumping station.

[0020] Furthermore, the main structure is a precast reinforced concrete structure.

[0021] Furthermore, multiple steel sleeves are connected end to end to form the pump house shaft, and a base plate is provided at the bottom of the pump house shaft. The reinforcing bars in the base plate are welded to the inner wall of the steel sleeves.

[0022] Furthermore, the separate pump room structure for subway tunnels also includes an opening structure slab and a water-stopping device;

[0023] The opening structure slab is located on the inner wall of the bottom of the subway tunnel, and the top opening of the pump room shaft is located at the opening of the opening structure slab; the water-stopping device is located inside the opening of the opening structure slab.

[0024] The opening structure slab is equipped with built-in reinforcing bars, which are connected to the structural reinforcing bars of the subway tunnel.

[0025] Further, the separate pump house structure for subway tunnels also includes ring beams and cover plates;

[0026] The ring beam is located at the top of the pump room shaft, and the ring beam is used to connect the opening structure plate and the main structure; the cover plate is placed on the inner side of the ring beam;

[0027] The reinforcing bars in the opening structure slab and the main structure are all connected to the reinforcing bars in the ring beam.

[0028] Furthermore, the main structure includes a base plate and side walls, with the base plate located at the bottom end of the side walls and the top of the side walls connected to the ring beam.

[0029] A construction method for a separate pumping station in a subway tunnel based on a fully swirling, fully-cased design, the method comprising the following steps:

[0030] (1) Determine the location of the proposed pump house shaft at the bottom of the subway tunnel, and reinforce the soil below the location of the proposed pump house shaft and the surrounding area.

[0031] (2) The full-rotation equipment drives the steel casing to perform circumferential cutting and excavation on the subway tunnel segments at the proposed pump house entrance and the soil directly below the tunnel segments. The bottom end of the steel casing is fixed with a cutting unit.

[0032] (3) After the tunneling is completed, the pipe segments and / or slag inside the steel casing are removed, and the steel casing forms a pump house shaft;

[0033] (4) Seal the bottom of the pump house shaft and install the main structure on the inner wall of the pump house shaft.

[0034] Furthermore, in step (4), adhesive is filled between the outer wall of the steel sleeve and the subway tunnel.

[0035] Furthermore, in step (4), after sealing the bottom of the pump house shaft, a bottom plate is installed at the bottom of the pump house shaft, so that the steel bars in the bottom plate are welded to the inner wall of the steel sleeve.

[0036] The main structure is installed from bottom to top inside the pump house shaft. The main structure is a precast reinforced concrete structure.

[0037] Furthermore, after reinforcing the soil below the location and surrounding area of ​​the proposed pump house shaft, a connecting plate for the opening is constructed at the location of the proposed pump house shaft, and the bottom end of the opening structure plate is connected to the subway tunnel as a whole. Subsequently, the water-stopping device is installed inside the opening of the opening structure plate.

[0038] Furthermore, after the main structure is installed, a ring beam is constructed at the top of the pump room shaft, and the steel bars in the opening structure plate and the main structure are all connected to the steel bars of the ring beam;

[0039] Then the prefabricated pumping station is placed into the main structure, and a cover plate is installed on the inner side of the ring beam.

[0040] The technical solution provided by this invention may include the following beneficial effects:

[0041] In the subway tunnel separated pump station structure of this invention, the steel sleeve forms the pump station shaft and serves as the protective wall structure. The steel sleeve and the main structure are combined to form a steel-concrete structure, which features good internal and external waterproofing, durability, and overall stability. In addition, the main structure is a prefabricated reinforced concrete structure, which allows for rapid installation and a short construction period. The prefabricated pump station is an integrated set of equipment, which is convenient to install and disassemble, and easy and cost-effective to maintain.

[0042] In the construction of pump house shafts using the full-rotation full-casing method of this invention, cutting units capable of cutting reinforced concrete structures are welded onto the steel casing. This eliminates the need for special steel segments in subway tunnels, reducing costs. Furthermore, the circumferential cutting of subway tunnel segments avoids full-section cutting, reducing the cutting range and damage to the subway tunnel, making construction safer, more efficient, time-saving, and allowing for more flexible placement. After the steel casing is constructed, slag removal and main structure installation are carried out under its protection, minimizing construction risks. The full-rotation construction process generates no mud pollution, making it environmentally friendly. Compared to existing technologies, the full-rotation full-casing method for shaft construction, internal mechanical slag removal, and prefabricated structure installation represents a higher degree of mechanization. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a radial cross-section of a subway tunnel-separated pump room structure according to an embodiment of the present invention.

[0044] Figure 2 yes Figure 1 Enlarged cross-sectional schematic diagram of the fixed structural plate and ring beam of the separated pump room structure in the subway tunnel shown;

[0045] Figure 3 This is a schematic diagram showing the cooperation between the water-stopping device and the opening structure plate;

[0046] Figure 4 This is a schematic diagram of the axial cross section of the subway tunnel during the excavation process in a construction method for a separate pumping station in a subway tunnel based on a fully rotating full casing according to an embodiment of the present invention.

[0047] Figure 5 yes Figure 4 The diagram shows a radial cross-section of the moving trolley and full-rotation equipment along the subway tunnel during the tunneling process.

[0048] Figure 6 This is a schematic diagram illustrating the construction method of a separated pumping station in a subway tunnel based on a full-rotation full-casing system according to an embodiment of the present invention, in which the slag removal machinery is used to remove the cut-off pipe segments and slag retained in the steel casing after the excavation is completed.

[0049] Figure 7 This is a schematic diagram of the prefabricated pumping station being hoisted into the main structure;

[0050] Among them, the cover plate is 100, the opening structure plate is 200, the steel sleeve is 300, the cushion layer is 310, the bottom plate is 320, the main structure is 330, the water-stopping device is 400, the embedded steel plate is 410, the grease pipe is 420, the wire brush is 430, the rubber curtain is 440, the bolt is 450, the ring beam is 500, the subway tunnel is 600, the prefabricated pump station is 700, the soil reinforcement zone is 800, the full-rotation equipment is 01, the mobile trolley is 02, the hoisting machinery is 03, and the slag removal machinery is 04. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0052] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0053] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The following is combined Figures 1 to 7 This invention describes a separate pump room structure for a subway tunnel and a construction method based on a full-rotation, full-casing pipe, according to an embodiment of the present invention.

[0056] A separate pump house structure for subway tunnels is disclosed. Located at the bottom of a subway tunnel, the structure includes a steel sleeve 300 and a main structure 330. The steel sleeve 300 forms a pump house shaft, and the main structure 330 is located on the inner wall of the shaft, accommodating the pump station. In this separate pump house structure, the steel sleeve 300 is constructed directly below the subway tunnel 600 to form the pump house shaft. The steel sleeve 300 is a structure used for full-rotation pipe jacking construction, formed by connecting precision-machined single steel pipe sections with a wall thickness of 1.5cm-2cm. The steel sleeve 300 can be vertically driven into the soil using a full-rotation device 01 to perform circumferential cutting on the subway tunnel 600 (shield tunnel segment) and the soil. Afterward, the cut-off segments and soil are removed, and the steel sleeve 300 remains in its original position as a protective wall structure during the installation of the main structure 330 of the pump house shaft. The main structure 330 is installed under the protection of the steel casing 300, ensuring safe construction of the pump house shaft. The construction of the pump house structure is highly mechanized, greatly improving construction efficiency and safety. The main structure 330 is also a load-bearing, waterproof, and corrosion-resistant structure. The combination of the steel casing 300 and the main structure 330 forms a steel-concrete structure, which makes the pump house structure have good internal and external waterproofing, good durability, and good overall stability.

[0057] Preferably, the main structure 330 is a precast reinforced concrete structure, which matches the shape of the steel sleeve 300. It can be precast in a factory through standardized production and transported to the tunnel for installation in the vertical shaft formed by the steel sleeve 300. Compared with cast-in-place structures, the construction period is shorter.

[0058] When the pump house shaft is of considerable depth, multiple steel sleeves 300 are connected end to end to form the pump house shaft. A base plate is installed at the bottom of the pump house shaft, and the reinforcing bars within the base plate are welded to the inner wall of the steel sleeves to obtain a stable structure. Below the base plate is a cushion layer 310, which is a sand cushion layer or a plain concrete cushion layer.

[0059] A prefabricated pumping station 700 is installed within the main structure; specifically, the prefabricated pumping station 700 is an integrated prefabricated pumping station 700. Specifically, in this invention, the prefabricated pumping station 700 also includes a pumping station control box for controlling the drainage pumps. In this embodiment, the pumping station control box is located within the subway tunnel 600.

[0060] To improve the positioning of the steel sleeve 300 with both the main structure 330 and the subway tunnel 600, and to enhance waterproofing, adhesives are applied between the outer wall of the steel sleeve 300 and the subway tunnel 600, and between the inner wall of the steel sleeve 300 and the outer wall of the main structure 330. This adhesive provides the aforementioned positioning and waterproofing effects; preferably, an epoxy resin adhesive is preferred.

[0061] The subway tunnel separate pump room structure of this embodiment of the invention also includes an opening structure plate 200 and a water-stopping device 400;

[0062] The portal structural slab 200 is located on the inner wall of the bottom of the subway tunnel 600, providing a working platform for installing the water-stopping device during the vertical construction of the full-swivel sleeve. It will later become part of the subway track bed structure. The water-stopping device 400 is located inside the portal of the portal structural slab 200, used to prevent water inrush during the full-swivel vertical construction. The portal structural slab 200 has internal reinforcing bars, which connect with the structural reinforcing bars of the subway tunnel, making the structure a unified whole. The internal reinforcing bars improve the strength of the connection between the portal structural slab 200 and the subway tunnel 600. It is understood that the portal structural slab 200 is made of concrete.

[0063] Specifically, the water-stopping device 400 includes a pre-embedded steel plate 410, a grease pipe 420, a wire brush 430, a rubber curtain 440, and bolts 450. The pre-embedded steel plate 410 is fixed inside the opening of the opening structure slab 200. The grease pipe 420 is located inside the opening structure slab 200, with one end of the grease pipe 420 located on the top wall of the opening structure slab 200 and the other end located inside the opening of the opening structure slab 200 with its opening located in the pre-embedded steel plate 410. The wire brush 430 is fixed to the pre-embedded steel plate 410 and located inside the opening of the opening structure slab 200. The rubber curtain 440 is located inside the opening of the opening structure slab 200 and above the wire brush 430. The top of the rubber curtain 440 is pressed against the top of the embedded steel plate 410. The bolt 450 passes through the pressure plate and the top of the rubber curtain 440 from top to bottom and extends into the top of the embedded steel plate 410. The bolt 450 secures the top of the rubber curtain 440 between the pressure plate and the embedded steel plate 410.

[0064] The subway tunnel separate pump station structure of this invention includes a ring beam 500 and a cover plate 100. The ring beam 500 is located at the top of the shaft and connects the opening structure slab 200 and the main structure 330. The cover plate 100 covers the inner side of the ring beam 500 and encloses the prefabricated pump station 700 within the main structure 330. The reinforcing bars in the opening structure slab 200 and the main structure 330 are connected to the reinforcing bars of the ring beam 500, ensuring the robust connection between the ring beam 500, the main structure 330, the opening structure slab 200, and the subway tunnel 600. Specifically, the ring beam 500 is made of concrete.

[0065] This invention also provides a construction method for a separate pumping station in a subway tunnel based on a full-rotation, full-casing system. This method is used for constructing the aforementioned separate pumping station structure in a subway tunnel and includes the following steps:

[0066] (1) Determine the location of the proposed pump house shaft on the inner wall of the bottom of the subway tunnel 600, and reinforce the soil below the location and surrounding area.

[0067] (2) A cutting unit is fixed at the bottom of the steel casing 300. The full-rotation device 01 drives the steel casing 300 together with the cutting unit to vertically downwards to perform ring cutting and excavation on the subway tunnel 600 segments at the proposed pump house opening and the soil directly below the subway tunnel 600. After reaching the preset depth, the work stops.

[0068] (3) After the tunneling is completed, the steel casing 300 is used as the wall protection structure, and the pipe segments and / or slag that have been cut off in the ring and retained in the steel casing 300 are removed manually or mechanically.

[0069] (4) The bottom of the cylindrical pump house shaft formed by the steel casing 300 is sealed, and then the main structure 330 is installed from bottom to top. The steel casing 300 is left between the soil and the main structure 330 without being removed.

[0070] The above method features high mechanization, low safety risk, high construction efficiency, and environmental friendliness. Specifically, a fully rotary device 01 drives a steel casing 300 vertically downwards to perform circular cutting and excavation of the subway tunnel segments 600 and the soil beneath the tunnel. After excavation, the slag and / or segments inside the steel casing 300 are removed, and the steel casing 300 remains in its original position. Under the protective effect of the steel casing 300, the main structure 330 is installed, and then the prefabricated pump station 700 is placed inside. Compared with existing technologies, this method significantly improves construction efficiency.

[0071] It should be noted that the lower end of the first 300mm steel casing is welded with a special high-strength alloy cutting tool capable of cutting reinforced concrete structures. The use of the full-rotation full-casing construction method eliminates the need for special steel segments in the subway tunnel, resulting in lower costs. Specifically, the 300mm steel casing performs circumferential cutting of the subway tunnel segments, avoiding the full-section cutting of existing technologies, reducing the cutting range and damage to the subway tunnel, making construction safer, more efficient, time-saving, and allowing for more flexible placement. After the steel casing is installed, slag removal and main structure installation are carried out under its protection, minimizing construction risks; the full-rotation construction process produces no mud pollution, making it environmentally friendly. The full-rotation full-casing construction method, including shaft and internal mechanical slag removal and prefabricated structure installation, represents a higher degree of mechanization compared to existing technologies.

[0072] Specifically, within the existing subway tunnel 600 meters, the location of the proposed pump house shaft will be accurately determined through surveying. Grouting will then be used to reinforce the soil around the pump house shaft. Preferably, the MJS grouting method will be used for soil reinforcement. The reinforced area should be larger than the pump house diameter and shaft depth, determined based on geological conditions.

[0073] It should be noted that before construction begins, a small full-rotation tunneling machine and a steel casing 300 corresponding to the size of the pump house shaft need to be manufactured, and the mobile trolley 02, hoisting machinery 03 and slag removal machinery 04 need to be transported to the location of the proposed pump house shaft inside the subway tunnel.

[0074] Before tunneling, the full-spinning equipment 01 is transported to the planned pump house shaft location inside the subway tunnel using a mobile trolley 02. Then, the hoisting machinery 03 lifts the full-spinning equipment 01 onto the tunnel entrance structural slab 200. The full-spinning equipment 01, along with the steel casing 300, performs circular cutting and tunneling of the subway tunnel segments 600 and the soil within the soil reinforcement zone 800 within the tunnel entrance area. The mobile trolley 02 can transport equipment within the subway tunnel 600. Specifically, the mobile trolley 02 moves the full-spinning equipment 01 to the side of the planned pump house shaft location, and then the hoisting machinery 03 lifts the full-spinning equipment 01 onto the working platform for precise positioning. Afterward, the steel casing 300 is installed on the full-spinning equipment 01, and the full-spinning equipment 01 is started to vertically downwards to perform circular cutting and tunneling of the subway tunnel 600 (subway tunnel segments) and the soil below the subway tunnel 600.

[0075] like Figure 3-6 As shown, the sides and top of the mobile trolley 02 abut against the inner wall of the subway tunnel 600 via abutment rods, ensuring stable positioning of the mobile trolley 02 within the subway tunnel 600 during operation. Furthermore, the hoisting machinery 03 is installed on the mobile trolley 02, allowing the full-spinning equipment 01, slag removal machinery 04, and prefabricated pump station 700 transported by the mobile trolley 02 to be more easily hoisted to their designated positions by the hoisting machinery 03.

[0076] In step (3), after tunneling is completed, preferably, a slag removal machine 04 is used to enter the steel casing 300 to remove the slag and / or segments that have been cut off and retained inside the steel casing 300. When the mechanical slag removal depth is close to the design depth, the remaining soil is removed manually.

[0077] To further explain, in step (4), adhesive is filled between the outer wall of the steel sleeve and the subway tunnel.

[0078] After sealing the bottom of the pump house shaft, a base slab is installed at the bottom of the shaft. The reinforcing bars within the base slab are welded to the inner wall of the steel sleeve 300, and then concrete is poured. Following this, the main structure 330 is installed from bottom to top, forming an integral load-bearing structure with the steel sleeve 300. The main structure is a precast reinforced concrete structure. Specifically, a cushion layer 310 is laid at the bottom of the pump house shaft, and a reinforcing mesh is installed above the cushion layer 310. The reinforcing mesh is welded to the inner wall of the steel sleeve 300, and then concrete is poured above the cushion layer 310. The concrete and the reinforcing mesh form the base slab of the reinforced concrete structure.

[0079] After the main structure is installed, a ring beam 500 is constructed at the top of the pump house shaft, and the reinforcing bars in the opening structure slab 200 and the main structure 330 are all connected to the reinforcing bars of the ring beam 500. Then, the prefabricated pump station is placed into the main structure, and a cover plate is constructed on the inner side of the ring beam. Due to the large weight of the prefabricated pump station 700, the prefabricated pump station 700 is hoisted into the main structure 330 of the pump house shaft using hoisting machinery 03, which ensures that the prefabricated pump station 700 can enter the main structure of the pump house smoothly.

[0080] It should be noted that, in order to facilitate construction, after the soil below the location and surrounding area of ​​the proposed pump house shaft is reinforced, an opening connection plate is constructed at the location of the proposed pump house shaft, and the bottom end of the opening structure plate 200 is connected to the subway tunnel 600 as a whole. Subsequently, the water-stopping device 400 is installed on the inside of the opening of the opening structure plate.

[0081] Other components and operations of the subway tunnel separate pump room structure and the construction method based on the full-rotation full casing according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0082] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A separate pump house structure for subway tunnels, wherein the separate pump house structure for subway tunnels is located at the bottom of the subway tunnel, characterized in that, It includes a steel casing and a main structure. The steel casing forms a pump house shaft, and the main structure is located on the inner wall of the pump house shaft. The main structure is used to accommodate the pump station. The full-rotation equipment drives the steel casing to perform circumferential cutting and excavation on the subway tunnel segments at the proposed pump house entrance and the soil directly below the tunnel segments. The bottom end of the steel casing is fixed with a cutting unit. The main structure is a precast reinforced concrete structure; It also includes the opening structure slab and the water-stopping device; The opening structure slab is located on the inner wall of the bottom of the subway tunnel, and the top opening of the pump room shaft is located at the opening of the opening structure slab; the water-stopping device is located inside the opening of the opening structure slab. The opening structure slab is equipped with built-in steel bars, which are connected to the structural steel bars of the subway tunnel. The water-stopping device includes a pre-embedded steel plate, a grease pipe, a wire brush, a rubber curtain, and bolts. The pre-embedded steel plate is fixed inside the opening of the opening structure slab. The grease pipe is located inside the opening structure slab, with one end of the grease pipe located on the top wall of the opening structure slab and the other end of the grease pipe located inside the opening of the opening structure slab with its opening located on the pre-embedded steel plate. The wire brush is fixed to the pre-embedded steel plate and located inside the opening of the opening structure slab. The rubber curtain is located inside the opening of the opening structure slab and above the wire brush. The top end of the rubber curtain is pressed against the top end of the embedded steel plate. The bolt passes through the top end of the pressure plate and the top end of the rubber curtain from top to bottom and extends into the top end of the embedded steel plate. The bolt secures the top end of the rubber curtain between the pressure plate and the embedded steel plate. Multiple steel sleeves are connected end to end to form the pump house shaft. The bottom of the pump house shaft is provided with a base plate, and the reinforcing bars in the base plate are welded to the inner wall of the steel sleeves. It also includes ring beams and cover plates; The ring beam is located at the top of the pump room shaft, and the ring beam is used to connect the opening structure plate and the main structure; the cover plate is placed on the inner side of the ring beam; The reinforcing bars in the opening structure slab and the main structure are all connected to the reinforcing bars in the ring beam.

2. A construction method for a separate pump station in a subway tunnel based on a full-rotation, full-casing system, characterized in that, This method is used for the construction of the subway tunnel separated pump house structure as described in claim 1, and includes the following steps: (1) Determine the location of the proposed pump house shaft at the bottom of the subway tunnel, and reinforce the soil below the location of the proposed pump house shaft and the surrounding area; the soil reinforcement method is MJS grouting method; the reinforcement area should be larger than the diameter of the pump house and the depth of the shaft. (2) The full-rotation equipment drives the steel casing to perform circumferential cutting and excavation on the subway tunnel segments at the proposed pump house entrance and the soil directly below the tunnel segments. The bottom end of the steel casing is fixed with a cutting unit. (3) After the tunneling is completed, the segments and / or slag inside the steel casing are removed, and the steel casing forms a pump house shaft; (4) Seal the bottom of the pump house shaft and install the main structure on the inner wall of the pump house shaft; In step (4), adhesive is filled between the outer wall of the steel sleeve and the subway tunnel; In step (4), after sealing the bottom of the pump house shaft, a bottom plate is installed at the bottom of the pump house shaft, and the steel bars in the bottom plate are welded to the inner wall of the steel sleeve. The main structure is installed from bottom to top inside the pump house shaft. The main structure is a precast reinforced concrete structure. After reinforcing the soil below the location and surrounding area of ​​the proposed pump house shaft, a hole connection plate is constructed at the location of the proposed pump house shaft, and the bottom end of the hole structure plate is connected to the subway tunnel as a whole. Then, the water-stopping device is installed inside the hole of the hole structure plate. After the main structure is installed, a ring beam is constructed at the top of the pump room shaft, and the steel bars in the opening structure plate and the main structure are connected to the steel bars in the ring beam. Then the prefabricated pumping station is placed into the main structure, and a cover plate is installed on the inner side of the ring beam.

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