Connecting structure of vertical shaft and shield tunnel in method of hanging well wall upside down

Abstract

The utility model relates to the technical field of vertical shaft supports, in particular to a connecting structure of a vertical shaft and a shield tunnel under a method of hanging a shaft wall upside down, which comprises a rectangular vertical shaft, the lower end of the vertical shaft is connected with the shield tunnel, and the connecting structure is characterized in that a plurality of support piles are uniformly arranged around the vertical shaft; the multiple supporting piles form a supporting enclosure structure on the periphery of the vertical shaft, the lower ends of the multiple supporting piles at the joint of the vertical shaft and the shield tunnel extend to the upper side of the shield tunnel, the lower ends of the other supporting piles extend to the lower side of the shield tunnel, and concrete supporting assemblies are arranged on the multiple supporting piles. The concrete supporting assembly comprises an annular first concrete waist beam which is arranged at the upper ends of the multiple supporting piles in a connected mode, and the multiple supporting piles are connected into a whole through the first concrete waist beam. The method has the effect of preventing the vertical shaft from collapsing.

Description

Technical Field

[0001] This application relates to the technical field of shaft support, and in particular to a connection structure between a shaft and a shield tunnel using an inverted shaft wall construction. Background Technology

[0002] Shield tunneling is a fully mechanized construction method within the cut-and-cover tunneling technique. It requires a tunnel boring machine (TBM) to excavate through the ground. The TBM is launched and received at the ends of a vertical shaft, which is a vertically oriented, well-like tunnel, essentially a type of sinkhole. In plan view, it is square, rectangular, or irregularly circular. The shaft walls are steep, almost vertical. Vertical shafts are widely used in water conservancy and hydropower projects for water intake, water diversion, ventilation, slag removal, and gas supply. Vertical shaft construction is characterized by its small footprint and minimal interference with surrounding construction.

[0003] In the construction of vertical shafts, the method of inverted shaft walls is required for excavation. During the downward excavation, the shaft walls are gradually reinforced to prevent the soil layer on the shaft walls from collapsing. Therefore, vertical shaft technology is required to spray concrete on the shaft walls and bottom to reinforce the shaft. However, directly applying concrete to the shaft walls results in poor bonding strength, making the concrete walls prone to cracking or even collapse. Utility Model Content

[0004] To prevent the shaft from collapsing, this application provides a connection structure between the shaft and the shield tunnel using an inverted shaft wall method.

[0005] This application provides a connection structure between a vertical shaft and a shield tunnel using an inverted shaft wall construction method, employing the following technical solution:

[0006] A vertical shaft and shield tunnel connection structure using an inverted shaft wall method includes a rectangular vertical shaft, the lower end of which is connected to the shield tunnel. Multiple support piles are evenly arranged around the vertical shaft, forming a support and retaining structure. The lower ends of the support piles at the connection point between the vertical shaft and the shield tunnel extend to the upper side of the shield tunnel, while the lower ends of the remaining support piles extend to the lower side of the shield tunnel. Concrete support components are installed on the support piles. Each concrete support component includes a first annular concrete waist beam connecting the upper ends of the multiple support piles, which connects the multiple support piles into a whole.

[0007] By adopting the above technical solution, multiple support piles are installed around the shaft to resist the inward compression of the soil around the shaft. The first concrete waist beam can connect the multiple support piles into a whole, thereby increasing the strength of the multiple support piles and enabling them to better resist the compression of the surrounding soil, while preventing the soil around the shaft from collapsing.

[0008] Preferably, multiple first support rods are provided on the inner side of the first concrete waist beam. The multiple first support rods are located on the first concrete waist beam and near the four corners, forming a triangular stable structure. The two ends of the first support rods are fixed to the annular first concrete waist beam.

[0009] By adopting the above technical solution, the first support rod and the first concrete waist beam form a triangular stable structure, thereby increasing the strength of the first concrete waist beam by multiple first support rods, thus better connecting and fixing multiple support piles.

[0010] Preferably, multiple first water-stop curtain piles are installed in the gap between two adjacent support piles, and the multiple first water-stop curtain piles interlock with each other and interlock with the two adjacent support piles.

[0011] By adopting the above technical solution, the first water-stop curtain pile can fill the gap between two adjacent support piles and prevent groundwater from entering the shaft.

[0012] Preferably, multiple second water-stop curtain piles are arranged in a ring outside the multiple support piles, with the multiple second water-stop curtain piles interlocking with each other, and the second water-stop curtain piles also interlock with the support piles and the first water-stop curtain piles respectively.

[0013] By adopting the above technical solution, the second water-stopping curtain pile can form a reinforced water-stopping structure outside the support pile, effectively preventing groundwater from seeping into the shaft.

[0014] Preferably, a steel support assembly is provided on the multiple support piles. The steel support assembly includes a steel waist beam connected to the multiple support piles and located below the first concrete waist beam. The steel waist beam is ring-shaped, and steel support rods are provided on the inner side of the steel waist beam and near the four corners. The two ends of the steel support rods are fixed to the steel waist beam and form a triangular structure.

[0015] By adopting the above technical solution, during the excavation of the vertical shaft, as the depth of the downward excavation gradually increases, the steel support components installed can quickly fix the support piles around the shaft. Compared with concrete waist beams, steel waist beams have a faster construction speed and prevent the support piles from tilting inward.

[0016] Preferably, the steel support assembly is provided in multiple sets, and the multiple sets of steel support assemblies are evenly arranged on the shaft wall above the shield tunnel.

[0017] By adopting the above technical solution, the multiple sets of steel support components can better support and fix the support piles, thereby improving the strength of the shaft support structure and preventing the shaft from collapsing and falling into the shield tunnel.

[0018] Preferably, the concrete support assembly further includes a second concrete waist beam installed on the shaft wall and located at the shield tunnel position. The horizontal direction of the second concrete waist beam is flush with the diameter direction of the shield tunnel. A second support rod is installed on the inner side of the second concrete waist beam and near the four corners. The two ends of the second support rod are fixed to the second concrete waist beam.

[0019] By adopting the above technical solution, after the shaft is gradually excavated to the position required by the design, the second concrete waist beam can be supported and fixed on the shaft wall around the shield tunnel, and the fixing strength of the concrete waist beam is higher than that of the steel waist beam.

[0020] Preferably, the steel support assembly further includes support members disposed on the steel waist beam. The support members include L-shaped support plates that are snapped together at the four corners of the steel waist beam. Reinforcing rods are connected and fixed between adjacent support plates. Multiple reinforcing rods form a rectangular structure. The two ends of the reinforcing rods are detachably fixed to the support plates.

[0021] By adopting the above technical solution, when setting steel support components on the well wall, the support blocks are quickly installed onto the corresponding steel waist beams, and reinforcing rods are installed on the support plates. This quick installation method improves the fixing efficiency of the vertical well wall and prevents the soil from collapsing rapidly when excavating soft soil. Therefore, the quick-installation support components can prevent soil collapse.

[0022] Preferably, a pair of parallel snap-fit ​​strips are fixed to the back of the support plate near the steel waist beam, and the two snap-fit ​​strips are arranged on the upper and lower sides of the steel waist beam; a U-shaped mounting seat is fixed on the inner side of the support plate at the position where it connects with the end of the reinforcing rod, and the end of the reinforcing rod is inserted into the mounting seat.

[0023] By adopting the above technical solution, the snap-fit ​​strip can quickly pre-fix the support plate to the steel waist beam during the installation of the support plate, and allow the end of the reinforcing rod to be quickly installed onto the mounting base, thereby improving the efficiency of installing the support components.

[0024] Preferably, a reinforcing rod is connected between two adjacent reinforcing rods, and the two ends of the reinforcing rod are fixed to the two adjacent reinforcing rods.

[0025] By adopting the above technical solution, the strength of multiple reinforcing rods is increased by setting up a ring-shaped reinforcing rod structure inside the steel waist beam, thereby increasing the strength of the steel waist beam. It is also more convenient and quick to set up the steel waist beam support, preventing the collapse of the inner wall of the shaft.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. In the process of reinforcing the shaft wall, before excavating the shaft, a first concrete waist beam is pre-fabricated at the top of multiple support piles. Then, after excavating the shaft to a certain depth, a first support rod can be installed on the first concrete waist beam to increase its strength. During the subsequent excavation, a steel waist beam is used for rapid fixation to prevent the shaft wall from collapsing. Therefore, this application uses a combination of concrete waist beams and steel waist beams to support and fix the shaft wall.

[0028] 2. The first water-stop curtain pile set between two adjacent support piles and the second water-stop curtain pile set around the support piles and the first water-stop curtain pile can form a double-layer sealing structure on the well wall, effectively preventing groundwater in the soil around the well wall from seeping into the well wall.

[0029] 3. The support components installed on the steel girders can quickly form a support and fixation on the steel girders, improving the efficiency of installing steel support components and preventing soil collapse. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram illustrating the concrete support assembly and the steel support assembly in the embodiments of this application.

[0032] Figure 3 This is a schematic diagram illustrating the support component in an embodiment of this application.

[0033] Figure 4 This is a schematic diagram illustrating the snap-fit ​​strip in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Shaft; 2. Support pile; 3. First water-stop curtain pile; 4. Second water-stop curtain pile; 5. Concrete support assembly; 51. First concrete wainscoting beam; 52. First support rod; 53. Second concrete wainscoting beam; 54. Second support rod; 6. Steel support assembly; 61. Steel wainscoting beam; 62. Steel support rod; 63. Support component; 631. Support plate; 632. Connecting strip; 633. Reinforcing rod; 634. Mounting base; 635. Fixing bolt; 636. Reinforcing rod. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a connection structure between a vertical shaft and a shield tunnel under an inverted shaft wall construction method. It includes a vertical shaft 1 that is set at the location of the shield tunnel and excavated. The vertical shaft 1 has a rectangular structure and is connected to the shield tunnel after excavation.

[0037] Example 1

[0038] Reference Figure 1 and Figure 2 A method of connecting a vertical shaft and a shield tunnel using an inverted shaft wall construction includes support piles 2 vertically installed on the inner walls of the vertical shaft 1. The diameter of the pile hole of the support pile 2 is 1 meter. Multiple support piles 2 are installed and evenly distributed on the inner walls of the vertical shaft 1. The multiple support piles 2 form a supporting and retaining structure around the vertical shaft 1. Workers excavate the vertical shaft 1 inside the multiple support piles 2. During the excavation of the vertical shaft 1, construction is carried out by alternating holes to avoid continuous excavation and collapse of the pile hole.

[0039] Multiple support piles 2 extend downwards and reach the location of the shield tunnel. The lower ends of multiple support piles 2 at the location where the shield tunnel passes through the shaft 1 extend above the shield tunnel. The length of the support pile 2 at this location is 10 meters, and there are 6 piles. The lower ends of the remaining support piles 2 extend below the shield tunnel. The length of the support pile 2 at this location is 23 meters, and there are 18 piles. There are gaps between adjacent support piles 2, which makes it easy for groundwater to flow into the shaft 1 through the gaps. Multiple first water-stopping curtain piles 3 are installed between any two adjacent support piles 2. The multiple first water-stopping curtain piles 3 are interlocked and flush with each other, and are located on the outer side of the support piles 2. The installed first water-stopping curtain piles 3 can be used to prevent groundwater from entering the shaft 1. The diameter of the first water-stopping curtain pile 3 is 0.7 meters, the spacing between two adjacent first water-stopping curtain piles 3 is 0.5 meters, the length of the first water-stopping curtain pile 3 is the same as the length of the support pile 2, and the first water-stopping curtain pile 3 located at the shield tunnel crossing position is also the same as the length of the support pile 2.

[0040] Reference Figure 1 and Figure 2 Multiple second water-stopping curtain piles 4 are installed outside the multiple support piles 2 and multiple first water-stopping curtain piles 3. These second water-stopping curtain piles 4 interlock and form a ring structure. The second water-stopping curtain piles 4 interlock with both the support piles 2 and the first water-stopping curtain piles 3. The installation of these second water-stopping curtain piles 4 creates a reinforced water-stopping structure outside the support piles 2, effectively preventing groundwater from seeping into the shaft 1. The diameter of the second water-stopping curtain piles 4 is the same as the diameter of the first water-stopping curtain piles 3 and is not... The pile heights at the same location are also the same. The spacing between two adjacent second water-stop curtain piles 4 is 0.5 meters. In addition, the hole depths for processing the first and second water-stop curtains are 25 meters and 12 meters, respectively. The excess part is formed by dry mixing of concrete. The cement used for the pile body materials of the support piles 2, the first water-stop curtain piles 3, and the second water-stop curtain piles 4 is PO42.5, with a water-cement ratio of 1:1. Other design parameters are determined based on the test results at the construction site to meet the design requirements of the pile body.

[0041] Reference Figure 1 and Figure 2 A concrete support assembly 5 is installed on multiple support piles 2. The concrete support assembly 5 includes a first concrete waist beam 51 installed on the support piles 2 and near the opening of the shaft 1. The first concrete waist beam 51 has a rectangular structure. After the support piles 2 are constructed, the first concrete waist beam 51 is constructed on the multiple support piles 2. During construction, the first concrete waist beam 51 engages with the multiple support piles 2, allowing the multiple support piles 2 to be connected into a whole through the first concrete waist beam 51. After the construction of the first concrete waist beam 51 is completed, the shaft 1 is excavated; Multiple first support rods 52 are provided on the inner side of the waist beam 51. The multiple first support rods 52 are distributed at the four corners of the annular first concrete waist beam 51 and are inclined. The first support rods 52 are steel structures, and the first support rods 52 and the first concrete waist beam 51 form a triangular stable structure. The multiple first support rods 52 increase the strength of the first concrete waist beam 51, thereby allowing the first concrete waist beam 51 to better support the support piles 2, the first water-stop curtain piles 3 and the second water-stop curtain piles 4, and prevent them from tilting into the vertical shaft 1.

[0042] Reference Figure 1 and Figure 2 The concrete support assembly 5 also includes a second concrete waist beam 53 installed on the wall of the shaft 1 and at the connection point with the shield tunnel. The second concrete waist beam 53 has the same structure as the first concrete waist beam 51, and the second concrete waist beam 53 is also embedded in the support piles 2, allowing multiple support piles 2 to be connected as a whole. The second concrete waist beam 53 is set in a horizontal direction, and the horizontal direction of the second concrete waist beam 53 is the same as the diameter direction of the cross-section of the shield tunnel. The second concrete waist beam 53 is divided into two parts by the shield tunnel, which are symmetrically set on both sides of the shield tunnel entrance. A second support rod 54 is installed on the inner side of the second concrete waist beam 53 at each of the four corners. The second support rod 54 is made of the same material as the first support rod 52, which is steel structure. The two ends of the second support rod 54 are fixed to the second concrete waist beam 53, and the second support rod 54 and the second concrete waist beam 53 form a stable triangular structure, so that the second concrete waist beam 53 can fix the support piles 2, the first water-stop curtain piles 3 and the second water-stop curtain piles 4, and prevent the lower end from being squeezed and deformed by the soil.

[0043] Steel support components 6 are also installed on multiple support piles 2. Multiple sets of steel support components 6 are evenly arranged in the height direction of the support piles 2, and the multiple sets of steel support components 6 are located between the first concrete waist beam 51 and the second concrete waist beam 53. The steel support components 6 include a steel waist beam 61 that is connected and arranged on multiple support piles 2 in a ring shape. The steel waist beam 61 is parallel to the first concrete waist beam 51 and the second concrete waist beam 53, and the steel waist beam 61 is fixed to each support pile 2 by anchor rods or bolts and other fasteners. The steel waist beam 61 is arranged in a horizontal direction. Steel support rods 62 are installed on the inner side of the steel waist beam 61 and near the four corners. The two ends of the steel support rods 62 are fixed to the steel waist beam 61 and form a triangular structure, thereby increasing the strength of the steel waist beam 61 and enabling it to better withstand the force of the support piles 2, the first water-stop curtain piles 3 and the second water-stop curtain piles 4 squeezing into the shaft 1.

[0044] The implementation principle of Example 1 is as follows: In the vertical shaft 1 connected to the shield tunnel, a preliminary structure of the vertical shaft 1 is formed by setting support piles 2 in a rectangular distribution around the shaft wall of the vertical shaft 1. A first water-stop curtain pile 3 is set between two adjacent support piles 2, thereby forming a closed shaft wall with the support piles 2 to prevent groundwater from seeping into the interior of the vertical shaft 1. In addition, a second water-stop curtain pile 4 is set outside the support piles 2 and the first water-stop curtain pile 3, which can better waterproof and increase the strength of the support piles 2, preventing the support piles 2 from tilting inward after being squeezed. The concrete support component 5 and the steel support component 6 set on the inner side of the support piles 2 can be connected with the support piles 2 to form a whole, preventing the support piles 2 from tilting inward.

[0045] Example 2

[0046] Reference Figure 1 , Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that the steel support assembly 6 includes a support member 63 disposed on the steel waist beam 61. The support member 63 includes multiple support plates 631 that are snapped onto the steel waist beam 61. The multiple support plates 631 are distributed at the four corners of the steel waist beam 61, and the support plates 631 are L-shaped. The support plates 631 are composed of horizontal plates and vertical plates. A pair of snap-fit ​​strips 632 are fixedly connected to the back of the horizontal plates and vertical plates facing the steel waist beam 61. The two snap-fit ​​strips 632 are both horizontally arranged and parallel to the steel waist beam 61. The two snap-fit ​​strips 632 are located on the upper and lower sides of the steel waist beam 61. When the support plate 631 is installed on the steel waist beam 61, the support plate 631 can be snapped onto the steel waist beam 61 by the two snap-fit ​​strips 632. The support plates 631 increase the strength of the connection point of the steel waist beam 61 and prevent the steel waist beam 61 from breaking.

[0047] Reference Figure 1 , Figure 3 and Figure 4A reinforcing rod 633 is fixedly connected between each pair of adjacent support plates 631. Multiple reinforcing rods 633 and multiple support plates 631 form a rectangular reinforcement structure inside the steel waist beam 61. Both ends of the reinforcing rod 633 are detachably fixed to the support plates 631. U-shaped mounting seats 634 are fixed to the inner surfaces of the horizontal and vertical plates on the support plates 631. When installing the reinforcing rod 633, both ends of the reinforcing rod 633 can be inserted into the corresponding mounting seats 634. A fixing bolt 635 is provided at the end of the reinforcing rod 633. 35 passes through the reinforcing rod 633 and the mounting base 634, and fixes both of them; a reinforcing rod 636 is set between two adjacent reinforcing rods 633 and near the four corners of the steel waist beam 61. The two ends of the reinforcing rod 636 are respectively connected and fixed to the two adjacent reinforcing rods 633. The two ends of the reinforcing rod 636 are respectively fixed to the reinforcing rods 633 by the set fixing bolts 635. The set reinforcing rod 636 increases the strength of multiple reinforcing rods 633, thereby increasing the strength of the steel waist beam 61, and making it more convenient to set up the support for the steel waist beam 61.

[0048] The implementation principle of Example 2 is as follows: When the steel support component 6 is set, the support 63 can quickly form a support inside the steel waist beam 61 and support the steel waist beam 61 to prevent it from deforming. In addition, the support 63 can reduce the area occupied by the steel waist beam 61 at the wellhead, making the construction area of ​​the wellhead larger and more convenient for hoisting construction.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vertical shaft and shield tunnel connection structure using an inverted shaft wall construction, comprising a rectangular vertical shaft (1), the lower end of which is connected to the shield tunnel, characterized in that: Multiple support piles (2) are evenly arranged around the shaft (1). The multiple support piles (2) form a support and enclosure structure around the shaft (1). The lower ends of the multiple support piles (2) at the connection between the shaft (1) and the shield tunnel extend to the upper side of the shield tunnel, and the lower ends of the remaining support piles (2) extend to the lower side of the shield tunnel. Concrete support components (5) are provided on the multiple support piles (2). The concrete support components (5) include a first concrete waist beam (51) that connects the upper ends of the multiple support piles (2) and is in the shape of a ring. The first concrete waist beam (51) connects the multiple support piles (2) into a whole.

2. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 1, characterized in that: Multiple first support rods (52) are provided on the inner side of the first concrete waist beam (51). The multiple first support rods (52) are located on the first concrete waist beam (51) and near the four corners, forming a triangular stable structure. The two ends of the first support rods (52) are fixed to the annular first concrete waist beam (51).

3. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 1, characterized in that: Multiple first water-stop curtain piles (3) are installed in the gap between two adjacent support piles (2). The multiple first water-stop curtain piles (3) interlock with each other and interlock with the two adjacent support piles (2).

4. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 1, characterized in that: Multiple second water-stop curtain piles (4) are arranged in a ring outside the multiple support piles (2). The multiple second water-stop curtain piles (4) interlock with each other, and the second water-stop curtain piles (4) also interlock with the support piles (2) and the first water-stop curtain piles (3) respectively.

5. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 1, characterized in that: A steel support assembly (6) is provided on multiple support piles (2). The steel support assembly (6) includes a steel waist beam (61) connected to the multiple support piles (2) and located below the first concrete waist beam (51). The steel waist beam (61) is ring-shaped. A steel support rod (62) is provided on the inner side of the steel waist beam (61) and near the four corners. The two ends of the steel support rod (62) are fixed to the steel waist beam (61) and form a triangular structure.

6. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 5, characterized in that: The steel support assembly (6) is provided in multiple sets, and the multiple sets of steel support assemblies (6) are evenly arranged on the shaft wall of the vertical shaft (1) above the shield tunnel.

7. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 1, characterized in that: The concrete support assembly (5) also includes a second concrete waist beam (53) set on the wall of the shaft (1) and located at the shield tunnel position. The horizontal direction of the second concrete waist beam (53) is flush with the diameter direction of the shield tunnel. A second support rod (54) is set on the inner side of the second concrete waist beam (53) and near the four corners. The two ends of the second support rod (54) are fixed to the second concrete waist beam (53).

8. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 5, characterized in that: The steel support assembly (6) also includes a support member (63) set on the steel waist beam (61). The support member (63) includes a support plate (631) that is snapped into the four corners of the steel waist beam (61) and is L-shaped. A reinforcing rod (633) is connected and fixed between two adjacent support plates (631). Multiple reinforcing rods (633) form a rectangular structure. The two ends of the reinforcing rod (633) are detachably fixed to the support plate (631).

9. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 8, characterized in that: A pair of parallel snap-fit ​​strips (632) are fixed on the back of the support plate (631) near the steel waist beam (61), and the two snap-fit ​​strips (632) are set on the upper and lower sides of the steel waist beam (61); a U-shaped mounting seat (634) is fixed on the inner side of the support plate (631) at the position where it connects with the end of the reinforcing rod (633), and the end of the reinforcing rod (633) is inserted into the mounting seat (634).

10. The connection structure between the vertical shaft and the shield tunnel using the inverted shaft wall construction method according to claim 8, characterized in that: A reinforcing rod (636) is connected between two adjacent reinforcing rods (633), and the two ends of the reinforcing rod (636) are fixed to the two adjacent reinforcing rods (633).

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