Super-thick and super-deep TRD ditch type cutting cement-soil stratum reinforcing structure

Abstract

The utility model relates to an ultra-thick and ultra-deep TRD channel type cutting cement soil stratum reinforcing structure which comprises a shield tunnel body, an end well enclosure structure, a cement soil reinforcing body, a concrete continuous wall, a plurality of RJP high-pressure jet grouting piles and a plurality of frozen low-carbon steel pipes. The cement soil reinforcement body is composed of a plurality of rows of TRD channel type cutting cement soil plain walls, the thickness of each row is 1200 mm, the lap joint width between the rows is not smaller than 350 mm, the reinforcement range of the cement soil reinforcement body is that the longitudinal reinforcement length is 19 m, the reinforcement width is 5.5 m in the left-right direction and 6 m in the lower direction outside the tunnel outline, and the anti-damage and anti-leakage assemblies are arranged outside the multiple frozen low-carbon steel pipes and used for dispersing external loads. The TRD ditch type cutting plain cement wall with the thickness of 1200 mm is adopted for stratum reinforcement, the applicable stratum is wide, the height of mechanical equipment is low, the reinforcement depth is large, the requirement for reinforcement of a shield end with the burial depth of 90 m can be met, lap joints can be reduced, the water stop effect can be improved, meanwhile, the construction cost can be reduced, and the construction period can be shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit construction, in particular to an ultra-thick and ultra-deep TRD channel-type cutting cement soil layer reinforcement structure. Background Art

[0002] The launching and receiving of shield tunnels are two key nodes of shield engineering and are also the links where safety accidents are prone to occur. The reliability and effective water-stopping effect of the reinforcement of the starting and receiving shafts are also the key points and difficulties in the entire construction process. With the acceleration of urban construction, the increasing buried depth of urban rail transit engineering stations and the widespread use of large-diameter slurry shields crossing rivers and seas, the requirements for the quality and effect of the end reinforcement of such ultra-deep foundation pit shield working shafts are becoming increasingly higher.

[0003] Currently, commonly used end reinforcement methods include grouting, RJP high-pressure jet grouting piles, and triaxial mixing piles. These methods are all limited to ultra-deep strata reinforcement exceeding 25m in depth, and the limited reinforcement depth makes quality difficult to guarantee. Current construction techniques suitable for ultra-deep strata reinforcement exceeding 25m, such as TRD, CSM, and MJS, have a conventional maximum width of only 850mm, resulting in numerous joints due to overlap considerations. CSM is also prone to numerous overlap joints due to limitations in mechanical equipment and construction techniques. While MJS can produce larger diameter cement piles, it is subject to stratum and depth limitations, making uneven grouting prone to impacting pile uniformity. Furthermore, the reinforcement costs associated with this process are very high. All three ultra-deep strata reinforcement methods are prone to leakage channels, leading to dangerous situations such as shield tunneling and receiving water leakage. Therefore, for the reinforcement of water-rich ultra-deep shield ends (reinforcement depth greater than 25m), there is an urgent need for a reliable water-isolating reinforcement method that can improve the reinforcement quality of the end soil, increase work efficiency, reduce overlap, and ensure that the reinforced body is uniformly dense. Utility Model Content

[0004] In response to the technical problems in the existing patents, the existing shield end reinforcement structure adopts conventional reinforcement methods to reinforce the ultra-deep shield starting and receiving end soil, resulting in unsatisfactory reinforcement effects and low reinforcement efficiency, and the leakage channels in the reinforcement body are prone to cause shield starting and receiving water leakage and many other problems. The utility model provides an ultra-thick and ultra-deep TRD channel-type cutting cement soil layer reinforcement structure, which can meet the requirements of 1.2m wide and 90m buried depth TRD shield end soil reinforcement, which can effectively reduce lap joints, shorten construction period, reduce investment, and effectively ensure the strength and water-proof properties of the end reinforced soil.

[0005] The technical solution adopted by the utility model is: an ultra-thick and ultra-deep TRD channel-type cutting cement soil layer reinforcement structure, including a shield tunnel body, an end well enclosure structure, a cement soil reinforcement body, a concrete continuous wall, a plurality of RJP high-pressure jet grouting piles and a plurality of frozen low-carbon steel pipes;

[0006] The cement soil reinforcement body is composed of multiple rows of TRD channel-cut cement soil plain walls, each row is 1200mm thick, and the overlap width between rows is not less than 350mm. The reinforcement range of the cement soil reinforcement body is: longitudinal reinforcement length 19m, and reinforcement width is within 5.5m left and right and 6m below the tunnel outline.

[0007] Preferably, the outside of the plurality of frozen low-carbon steel pipes are provided with anti-damage and leakage components, which are used to disperse external loads and reduce direct pressure on the frozen low-carbon steel pipes. The anti-damage and leakage components include a supporting load-bearing pipe that is passed through the interior of the cement-soil reinforcement body, and the frozen low-carbon steel pipe is sleeved inside the supporting load-bearing pipe, and the outer surface of the supporting load-bearing pipe is provided with a plurality of hollow slots.

[0008] Preferably, a plurality of positioning and anti-movement strips are fixed to the outer surface of the supporting force-bearing tube.

[0009] Preferably, one end of the end shaft enclosure structure is connected to the shield tunnel body.

[0010] Preferably, a plurality of the RJP high-pressure jet grouting piles are arranged in a row adjacent to the end well enclosure structure to form a jet grouting pile reinforcement body, and the frozen low-carbon steel pipe is fixedly connected to the RJP high-pressure jet grouting piles.

[0011] Preferably, the concrete continuous wall is arranged in a U-shape around the periphery of the cement soil reinforcement body and is connected to the end well enclosure structure.

[0012] Preferably, a gap of 800 mm is left between the cement soil reinforcement body and the end well enclosure structure, and a single row of High-pressure jet grouting piles are used for jointing.

[0013] The beneficial effects of the utility model are:

[0014] 1. Use 1200mm thick TRD channel-cut cement soil wall for stratum reinforcement. It is applicable to a wide range of strata, has low height of mechanical equipment, and has a large reinforcement depth. It can meet the requirements of shield end reinforcement with a burial depth of 90m.

[0015] 2. Using 1200mm thick TRD channel-cut cement soil wall for stratum reinforcement can reduce overlap joints, improve water-stopping effects, reduce project costs and shorten construction periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3It is an exploded cross-sectional view of the frozen low-carbon steel pipe and the anti-leakage component in the utility model.

[0019] The markings in the figure are: 1. Shield tunnel body; 2. End shaft retaining structure; 3. Cement soil reinforcement; 4. Concrete continuous wall; 5. RJP high-pressure rotary jet pile; 6. Frozen low-carbon steel pipe; 7. Anti-leakage component; 71. Support load-bearing pipe; 72. Hollow slot; 73. Positioning anti-shift strip. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0022] The following is combined with Figure 1-3 The utility model is further described.

[0023] In order to solve the problems existing in the background technology, the present application proposes the following technical solution: an ultra-thick and ultra-deep TRD channel-cut cement soil layer reinforcement structure.

[0024] The specific technical solution includes a shield tunnel body 1, an end shaft retaining structure 2, a cement soil reinforcement body 3, a concrete continuous wall 4, multiple RJP high-pressure rotary grouting piles 5, multiple frozen low-carbon steel pipes 6 and multiple anti-leakage components 7. The cement soil reinforcement body 3 is composed of multiple rows of TRD channel-type cut cement soil plain walls, each row is 1200mm thick, and the overlap width between rows is not less than 350mm. The reinforcement range of the cement soil reinforcement body 3 is: the longitudinal reinforcement length is 19m, and the reinforcement width is within 5.5m to the left and 6m below the tunnel outline. The RD method is a method of connecting a chain saw-type cutting box inserted into the foundation with the main machine, moving, cutting and pouring cement slurry in the horizontal direction, forming convection in the trough, mixing, stirring and consolidating the soil in the original position, and forming an equal-thickness cement soil underground mixing wall. The conventional TRD wall thickness is 550-850mm, and the wall depth should not be greater than 50m. For the reinforcement of the end of ultra-deep and large-diameter slurry shield, a 1200mm thick TRD channel-cut cement soil wall is used for stratum reinforcement. It is applicable to a wide range of strata, has low height of mechanical equipment, and has a large reinforcement depth, which can meet the requirements of shield end reinforcement with a burial depth of 90m.

[0025] The reinforcement area is divided into 21 sections, and the method of one-on-one and jump construction is adopted. It is suitable for a wide range of strata, low height of mechanical equipment, and large reinforcement depth. It can meet the reinforcement of shield ends with a burial depth of 90m. The shield tunnel body 1 is arranged above the end well retaining structure 2, and the opposite ends of the shield tunnel body 1 and the end well retaining structure 2 are connected to it. The cement soil reinforcement body 3 is arranged above the end well retaining structure 2 and is located outside the shield tunnel body 1. Multiple RJP high-pressure rotary jet piles 5 are arranged in rows of rotary jet pile reinforcement bodies adjacent to the end well retaining structure 2. Frozen low-carbon steel pipes 6 are fixedly connected to the RJP high-pressure rotary jet piles 5. The concrete continuous wall 4 is U-shaped and arranged around the outside of the cement soil reinforcement body 3 and connected to the end well retaining structure 2. An 800mm gap is left between the cement soil reinforcement body 3 and the end well retaining structure 2, and a single row of High-pressure rotary jet piles 5 are used for joints, and an 800mm thick concrete continuous wall 4 is constructed on the periphery with C20 plain concrete. The reinforcement range of the cement soil reinforcement body 3 is a longitudinal reinforcement length of 19m, and the reinforcement width is within 5.5m to the left and 6m below the tunnel outline. The end well retaining structure 2 adopts a 1500mm thick underground continuous wall.

[0026] Multiple anti-leakage components 7 are respectively arranged on the outside of multiple frozen low-carbon steel pipes 6, and multiple frozen low-carbon steel pipes 6 are arranged in a grid pattern inside the cement soil reinforcement body 3, and both ends extend to the outside of the cement soil reinforcement body 3. The anti-leakage components 7 are used to disperse external loads and reduce direct pressure on the frozen low-carbon steel pipes 6, which helps to prevent the frozen low-carbon steel pipes 6 from being damaged by external pressure or impact during construction, resulting in coolant leakage and affecting the freezing effect. The anti-leakage components 7 include a supporting force-bearing pipe 71 that is passed through the cement soil reinforcement body 3, and the frozen low-carbon steel pipe 6 is sleeved inside the supporting force-bearing pipe 71. The outer surface of the supporting force-bearing pipe 71 is provided with multiple hollow slots 72 to retain the necessary contact volume between the frozen low-carbon steel pipe 6 and the cement soil reinforcement body 3 to prevent the normal performance of the frozen low-carbon steel pipe 6 from being affected after being fully surrounded. The outer surface of the supporting force-bearing pipe 71 is fixed with multiple positioning anti-movement strips 73, which are restricted by the positioning anti-movement strips 73 to stabilize the supporting force-bearing pipe 71.

[0027] The supporting force-bearing tube 71 arranged around the frozen low-carbon steel pipe 6 can reduce the external impact and pressure on the frozen low-carbon steel pipe 6, effectively disperse the external load, and enhance the overall stability, thereby preventing the external pressure from damaging the frozen low-carbon steel pipe 6. It helps to prevent the frozen low-carbon steel pipe 6 from being damaged by external pressure or impact during the construction process, resulting in coolant leakage, which affects the use effect of the frozen low-carbon steel pipe 6.

[0028] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0029] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-thick and ultra-deep TRD channel-type cutting cement soil layer reinforcement structure, characterized by: It includes a shield tunnel body (1), an end well enclosure structure (2), a cement soil reinforcement body (3), a continuous concrete wall (4), a plurality of RJP high-pressure jet grouting piles (5), and a plurality of frozen low-carbon steel pipes (6); The cement soil reinforcement body (3) is composed of multiple rows of TRD channel-cut cement soil plain walls, each row is 1200 mm thick, and the overlap width between rows is not less than 350 mm. The reinforcement range of the cement soil reinforcement body (3) is: the longitudinal reinforcement length is 19 m, and the reinforcement width is within the range of 5.5 m to the left and 6 m below the tunnel outline.

2. The ultra-thick and ultra-deep TRD channel cutting cement soil layer reinforcement structure according to claim 1 is characterized in that: The exterior of the plurality of frozen low-carbon steel pipes (6) is provided with an anti-damage and leakage component (7), and the anti-damage and leakage component (7) is used to disperse the external load and reduce the direct pressure on the frozen low-carbon steel pipe (6). The anti-damage and leakage component (7) includes a support stress-bearing pipe (71) that is penetrated into the interior of the cement soil reinforcement body (3), and the frozen low-carbon steel pipe (6) is sleeved inside the support stress-bearing pipe (71), and the outer surface of the support stress-bearing pipe (71) is provided with a plurality of hollow slots (72).

3. The ultra-thick and ultra-deep TRD channel cutting cement soil layer reinforcement structure according to claim 2 is characterized in that: A plurality of positioning and anti-movement strips (73) are fixed to the outer surface of the supporting force-bearing tube (71).

4. The ultra-thick and ultra-deep TRD channel cutting cement soil layer reinforcement structure according to claim 1 is characterized in that: One end of the end well enclosure structure (2) is connected to the shield tunnel body (1).

5. The ultra-thick and ultra-deep TRD channel cutting cement soil stratum reinforcement structure according to claim 1 is characterized in that: A plurality of the RJP high-pressure jet grouting piles (5) are arranged in a row adjacent to the end well enclosure structure (2) to form a jet grouting pile reinforcement body, and the frozen low-carbon steel pipe (6) is fixedly connected to the RJP high-pressure jet grouting piles (5).

6. The ultra-thick and ultra-deep TRD channel cutting cement soil stratum reinforcement structure according to claim 1 is characterized in that: The concrete continuous wall (4) is arranged in a U-shape around the periphery of the cement soil reinforcement body (3) and is connected to the end well enclosure structure (2).

7. The ultra-thick and ultra-deep TRD channel cutting cement soil layer reinforcement structure according to claim 1 is characterized in that: A gap of 800 mm is left between the cement soil reinforcement body (3) and the end well enclosure structure (2), and a single row of 1500@1100RJP high pressure jet grouting piles (5) are used for jointing.

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