Reinforcing structure for shield tunneling close to existing viaduct foundation

Abstract

The utility model provides a kind of reinforcing structure that shield tunnel is close range crossing existing viaduct foundation, it is related to shield tunnel construction technical field, including the steel plate being set on the outer wall of pier, the fixed connection of steel plate bottom and pile cap is formed, connecting plate is also set between the adjacent two pile caps, the second reinforcing bar that the soil of pile cap and pile foundation side is located the end of connecting plate and is arranged to stop, the supporting assembly that the upward support of connecting plate is arranged in the bottom of connecting plate.The utility model prevents the vibration force caused by the rotation cutting of shield machine cutterhead by setting steel plate, and the situation such as pier cracking is caused;By setting connecting plate, and setting second reinforcing bar on connecting plate, the soil of pile cap and pile foundation close to the construction side of shield machine can be stopped, prevent the vibration caused by shield machine construction, reduce the stability of pile cap and pile foundation, prevent the phenomenon of downward collapse of connecting plate after bottom soil loosening by setting supporting assembly.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnel construction technology, and in particular to a reinforcement structure for shield tunnels passing close to existing viaduct foundations. Background Technology

[0002] In rail transit construction, there are often situations where shield tunnels pass close to the foundations of existing viaducts. Shield tunnels require the use of tunnel boring machines (TBMs) for construction. When the TBM's cutterhead rotates and cuts, it causes vibrations to the viaduct, affecting the stability of the piers and abutments.

[0003] Furthermore, the strong vibrations generated when the cutterhead of the tunnel boring machine rotates and cuts can loosen the soil near the foundation and piles, affecting the stability of the foundation and piles. Utility Model Content

[0004] In order to solve the technical problem that the rotation and cutting of the cutterhead of the tunnel boring machine affects the stability of bridge piers, abutments and pile foundations in the existing technology, this utility model provides a reinforcement structure for tunnel boring machines to pass close to the foundation of existing viaducts.

[0005] This utility model provides a reinforcement structure for shield tunnels passing close to existing viaduct foundations, employing the following technical solution: A reinforcement structure for shield tunnels passing close to existing viaduct foundations includes steel plates installed on the outer wall of the piers to reinforce them. The bottom of the steel plates is fixedly connected to the foundation, and a connecting plate is installed between two adjacent foundations. Second reinforcing bars are installed at both ends of the connecting plate to stop the soil on the sides of the foundation and pile foundation. A support component is installed at the bottom of the connecting plate to support the connecting plate upward.

[0006] By adopting the above technical solutions: Steel plates are installed to enhance the shear and vibration resistance of the bridge piers, preventing cracking caused by vibrations generated during the tunnel boring machine's cutterhead rotation; connecting plates are installed between adjacent abutments, with a second reinforcing bar on the connecting plate to stop the soil on the side of the abutment and pile foundation closest to the tunnel boring machine, preventing vibrations from the tunnel boring machine from loosening the soil near the abutment and pile foundation, thus reducing their stability; and support components are installed to prevent the connecting plate from collapsing due to loosening of the bottom soil, ensuring the stability of the connection between the connecting plate and the abutment.

[0007] Furthermore, the steel plate includes a first steel plate and a second steel plate, and there are multiple second steel plates. The multiple second steel plates are arranged in a transverse manner and evenly bonded to the surface of the bridge pier with an adhesive. There are multiple first steel plates, and the multiple first steel plates are arranged in a longitudinal manner and evenly bonded to the surface of the bridge pier with an adhesive.

[0008] By adopting the above technical solution, both the first steel plate and the second steel plate are fixedly mounted on the surface of the bridge pier.

[0009] Furthermore, the first steel plate is pressed against the outside of the second steel plate, and a first reinforcing bar is provided on the outside of the first steel plate. The first reinforcing bar passes through the first steel plate and the second steel plate and is inserted into the pier. The bottom of the second steel plate extends to the upper part of the pier cap and is fixed by the first reinforcing bar.

[0010] By adopting the above technical solution: the placement positions of the first steel plate and the second steel plate are reinforced by setting the first reinforcing bar, so that the first reinforcing bar can transfer the tensile / shear force of the steel plate to the inside of the pier, avoiding the first reinforcing bar being easily peeled off by relying solely on adhesive layer bonding, and at the same time improving the shear and vibration resistance of the pier; the bottom of the second steel plate is extended to the upper part of the abutment to increase the stability between the pier and the abutment.

[0011] Furthermore, the connecting plate is disposed at the lower part of the bottom edge of the second steel plate and is fixed by the first reinforcing bar, which passes through the bottom edge of the second steel plate and the connecting plate and is then inserted into the upper part of the support platform.

[0012] By adopting the above technical solution, two adjacent foundations are connected by a connecting plate, so that the two adjacent foundations can jointly resist the vibration force generated by the tunnel boring machine during construction.

[0013] Furthermore, the second reinforcing bar consists of multiple bars evenly distributed in front of the pile cap and the pile foundation, and the second reinforcing bar is arranged in two staggered rows.

[0014] By adopting the above technical solution, the second steel bars are arranged in two staggered rows to increase the stopping force of the second steel bars on the soil and prevent the soil from moving out from the gap between two adjacent second steel bars.

[0015] Furthermore, the sides at both ends of the connecting plate extend outward with trapezoidal plates, and multiple third reinforcing bars are inserted around the outer edge of the trapezoidal plates.

[0016] By adopting the above technical solution, the third steel bar can stop the soil on the side of the pile cap and pile foundation, so as to prevent the soil on the side of the pile cap and pile foundation from loosening during the tunnel boring machine construction.

[0017] Furthermore, the surface of the connecting plate is provided with multiple elongated holes for water infiltration, and multiple connecting ribs are formed on the surface of the connecting plate through the arrangement of the elongated holes.

[0018] By adopting the above technical solution, the surface of the connecting plate can be kept relatively dry by setting elongated holes, thereby increasing the service life of the connecting plate.

[0019] Furthermore, the support assembly includes a trapezoidal support member and an insert plate. The trapezoidal support member is disposed at the bottom of the connecting rib. A connecting rod is welded to the bottom of the trapezoidal support member. The connecting rod passes through the connecting rib and extends upward to form a sliding connection with the connecting rib. A drive plate is disposed at the top of the connecting rod.

[0020] By adopting the above technical solution, the trapezoidal support can be moved downward at the bottom of the connecting plate by applying force to the drive plate.

[0021] Furthermore, the upper part of the trapezoidal support is provided with pillars on both sides. The pillars extend upward after passing through the connecting ribs and form a sliding connection with the connecting ribs. Multiple mounting slots are provided on the pillars. Limiting sleeves are welded on the connecting ribs at positions corresponding to the pillars. Insert plates are inserted into the limiting sleeves. After passing through the limiting sleeves, the insert plates are inserted into the mounting slots.

[0022] By adopting the above technical solution, the connecting plate and the support component are fixedly connected, so that the support component can provide upward support to the connecting plate through the structural design of the column and the insert plate.

[0023] In summary, the beneficial effects of this utility model are as follows: 1. This utility model enhances the shear and vibration resistance of bridge piers by incorporating steel plates and first reinforcing bars, preventing cracking caused by vibrations generated during the rotation and cutting of the tunnel boring machine's cutterhead. Furthermore, by installing a connecting plate between two adjacent pier caps, and placing a trapezoidal plate, second reinforcing bar, and third reinforcing bar on the connecting plate, the soil near the tunnel boring machine's construction side of the pier caps and pile foundations can be contained, preventing vibrations from the tunnel boring machine from loosening the soil near the pier caps and pile foundations and reducing their stability.

[0024] 2. By setting a support component at the bottom of the connecting plate, when in use, the insert plate is removed from the mounting slot, and force is applied to the drive plate to make the connecting rod drive the trapezoidal support to move downward to compact the soil. Then, the insert plate is inserted into the corresponding mounting slot to form a fixed connection between the support component and the connecting plate, so that the support component can support the connecting plate upward. This structural design prevents the connecting plate from collapsing downward due to the loosening of the soil at the bottom, and ensures the stability of the connection between the connecting plate and the foundation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Enlarged view of part A in the middle; Figure 3 This utility model Figure 1 Enlarged view of part B in the middle; Figure 4This is a schematic diagram of the support component structure of this utility model; Figure 5 This is a schematic diagram of the bottom structure of this utility model.

[0026] In the diagram: 1. Pier; 2. Abutment; 21. Pile foundation; 3. Steel plate; 5. First reinforcing bar; 6. Connecting plate; 7. Support assembly; 31. First steel plate; 32. Second steel plate; 61. Trapezoidal plate; 62. Second reinforcing bar; 63. Third reinforcing bar; 64. Connecting bar; 65. Long hole; 71. Trapezoidal support; 72. Column; 73. Limiting sleeve; 74. Insert plate; 75. Connecting rod; 721. Mounting groove; 751. Drive plate. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0028] Reference Figure 1 and Figure 2 As shown, this utility model discloses a reinforcement structure for a shield tunnel passing close to an existing viaduct foundation. It includes steel plates 3 reinforced on the outer wall of a pier 1. Each steel plate 3 comprises a first steel plate 31 and a second steel plate 32. Multiple second steel plates 32 are horizontally arranged and evenly bonded to the surface of the pier 1 using an adhesive. Multiple first steel plates 31 are longitudinally arranged and evenly bonded to the surface of the pier 1 using an epoxy resin adhesive. Furthermore, the first steel plates 31 are pressed against the outside of the second steel plates 32. A first reinforcing bar 5 is located outside the first steel plate 31, passing through the first and second steel plates 31 and then inserted into the pier 1. By setting the first reinforcing bar 5 to reinforce the positions of the first steel plate 31 and the second steel plate 32, a collaborative force-bearing system of "steel plate 3-adhesive layer-first reinforcing bar 5-original structure" is formed. The first reinforcing bar 5 can transmit the tensile / shear force of the steel plate 3 to the inside of the pier 1, avoiding the easy peeling of the first reinforcing bar 5 due to the adhesive layer alone. At the same time, it improves the shear and vibration resistance of the pier 1 and prevents the vibration force generated when the shield machine cutterhead rotates and cuts, which may cause the pier 1 to crack.

[0029] Furthermore, the bottom of the second steel plate 32 extends to the upper part of the pier cap 2 and is fixed by the first reinforcing bar 5 to increase the stability between the pier 1 and the pier cap 2. A connecting plate 6 is also provided between two adjacent pier caps 2. The connecting plate 6 is located at the lower part of the bottom edge of the second steel plate 32 and is fixed by the first reinforcing bar 5. The first reinforcing bar 5 passes through both the bottom edge of the second steel plate 32 and the connecting plate 6 and is inserted into the upper part of the pier cap 2. The connecting plate 6 connects two adjacent pier caps 2, so that the two adjacent pier caps 2 can jointly resist the vibration force generated by the tunnel boring machine during construction.

[0030] Second reinforcing bars 62 are also provided at both ends of the connecting plate 6. Multiple second reinforcing bars 62 are evenly distributed in front of the foundation 2 and pile foundation 21. These second reinforcing bars 62 act as a stop for the soil in front of the foundation 2 and pile foundation 21, preventing the soil from loosening or shifting due to vibrations generated during tunnel boring machine construction, thus ensuring the stability of the foundation 2 and pile foundation 21. Preferably, the second reinforcing bars 62 are arranged in two staggered rows to increase the stopping force on the soil and prevent soil from migrating out through the gaps between adjacent second reinforcing bars 62.

[0031] The sides of the connecting plate 6 extend outwards to form trapezoidal plates 61. Multiple third steel bars 63 are threaded around the outer edge of the trapezoidal plates 61. The third steel bars 63 can stop the soil on the sides of the foundation 2 and the pile foundation 21 to prevent the soil on the sides of the foundation 2 and the pile foundation 21 from loosening during the tunnel boring machine construction.

[0032] Reference Figure 3 As shown, the surface of the connecting plate 6 has multiple elongated holes 65 for water infiltration. Multiple connecting ribs 64 are formed on the surface of the connecting plate 6 through the elongated holes 65. The elongated holes 65 allow the surface of the connecting plate 6 to remain relatively dry, thereby increasing the service life of the connecting plate 6.

[0033] Reference Figures 3-5As shown, a support assembly 7 is provided at the bottom of the connecting rib 64 to provide upward support for the connecting plate 6. When the tunnel boring machine (TBM) cutterhead rotates and cuts, the soil layer above the TBM is thin and prone to loosening. The support assembly 7 provides upward support for the connecting plate 6 to prevent it from collapsing downwards due to soil loosening at the bottom. Specifically, the support assembly 7 includes a trapezoidal support member 71 and an insert plate 74. The trapezoidal support member 71 is located at the bottom of the connecting plate 6, and a connecting rod 75 is welded upwards from the bottom of the trapezoidal support member 71. The connecting rod 75 passes through the connecting plate 6 and extends upwards, forming a sliding connection with the connecting plate 6. A drive plate 751 is located at the top of the connecting rod 75. By applying force to the drive plate 751, the trapezoidal support member 71 can move downwards from the bottom of the connecting plate 6. Support columns 72 are provided on both sides of the upper part of the trapezoidal support member 71. The support columns 72 pass through the connecting plate 6 and extend upwards, forming a sliding connection with the connecting plate 6. Furthermore, the support column 72 is provided with multiple mounting slots 721, and a limiting sleeve 73 is welded to the connecting plate 6 at the position corresponding to the support column 72. An insert plate 74 is inserted into the limiting sleeve 73 and then inserted into the mounting slot 721 after passing through the limiting sleeve 73, so that the connecting plate 6 and the support assembly 7 form a fixed connection, so that the support assembly 7 can provide upward support to the connecting plate 6 through the structural design of the support column 72 and the insert plate 74.

[0034] When using this reinforcement structure, the shear and vibration resistance of the pier 1 is enhanced by setting steel plates 3 and first reinforcing bars 5, preventing cracking of the pier 1 caused by the vibration force generated when the shield machine cutterhead rotates and cuts. Furthermore, by setting connecting plates 6 between two adjacent pier caps 2, and installing trapezoidal plates 61, second reinforcing bars 62, and third reinforcing bars 63 on the connecting plates 6, the soil near the shield machine construction side of the pier caps 2 and pile foundations 21 can be stopped, preventing vibration generated during shield machine construction from loosening the soil near the pier caps 2 and pile foundations 21, thus reducing the stability of the pier caps 2 and pile foundations 21. Furthermore, by setting a support component 7 at the bottom of the connecting plate 6, when in use, the insert plate 74 is removed from the mounting groove 721, and force is applied to the drive plate 751 to cause the connecting rod 75 to drive the trapezoidal support member 71 to move downward and compact the soil. Subsequently, the insert plate 74 is inserted into the corresponding mounting groove 721 to form a fixed connection between the support component 7 and the connecting plate 6, so that the support component 7 can support the connecting plate 6 upward. This structural design prevents the connecting plate 6 from collapsing downward due to the loosening of the soil at the bottom, ensuring the stability of the connection between the connecting plate 6 and the foundation 2.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A reinforcement structure for a shield tunnel passing close to an existing viaduct foundation, comprising steel plates (3) installed on the outer wall of the pier (1) to reinforce the pier (1), characterized in that, The bottom of the steel plate (3) is fixedly connected to the foundation (2). A connecting plate (6) is also provided between two adjacent foundations (2). Second steel bars (62) are provided at both ends of the connecting plate (6) to stop the soil on the side of the foundation (2) and the pile foundation (21). A support component (7) is provided at the bottom of the connecting plate (6) to support the connecting plate (6) upward.

2. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 1, characterized in that, The steel plate (3) includes a first steel plate (31) and a second steel plate (32). There are multiple second steel plates (32). The multiple second steel plates (32) are arranged in a transverse manner and are evenly bonded to the surface of the bridge pier (1) by adhesive. There are multiple first steel plates (31). The multiple first steel plates (31) are arranged in a longitudinal manner and are evenly bonded to the surface of the bridge pier (1) by adhesive.

3. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 2, characterized in that, The first steel plate (31) is pressed against the outside of the second steel plate (32). A first reinforcing bar (5) is provided outside the first steel plate (31). The first reinforcing bar (5) passes through the first steel plate (31) and the second steel plate (32) and is inserted into the pier (1). The bottom of the second steel plate (32) extends to the upper part of the pier (2) and is fixed by the first reinforcing bar (5).

4. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 3, characterized in that, The connecting plate (6) is located at the bottom of the second steel plate (32) and fixed by the first reinforcing bar (5). The first reinforcing bar (5) passes through the bottom of the second steel plate (32) and the connecting plate (6) and is then inserted into the upper part of the support platform (2).

5. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 4, characterized in that, The second steel bar (62) is a plurality of the two steel bars evenly distributed in front of the foundation (2) and the pile foundation (21), and the second steel bar (62) is arranged in two staggered rows.

6. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 1, characterized in that, The sides of the connecting plate (6) extend outward to form trapezoidal plates (61), and multiple third steel bars (63) are provided around the outer edge of the trapezoidal plates (61).

7. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 1, characterized in that, The surface of the connecting plate (6) is provided with a plurality of elongated holes (65) for water to seep in, and a plurality of connecting ribs (64) are formed on the surface of the connecting plate (6) through the arrangement of the elongated holes (65).

8. The reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 7, characterized in that, The support assembly (7) includes a trapezoidal support member (71) and a insert plate (74). The trapezoidal support member (71) is located at the bottom of the connecting rib (64). A connecting rod (75) is welded upward from the bottom of the trapezoidal support member (71). The connecting rod (75) passes through the connecting rib (64) and extends upward to form a sliding connection with the connecting rib (64). A drive plate (751) is located at the top of the connecting rod (75).

9. A reinforcement structure for a shield tunnel passing close to an existing viaduct foundation as described in claim 8, characterized in that, The trapezoidal support (71) has two pillars (72) on its upper sides. The pillars (72) extend upward after passing through the connecting ribs (64) and form a sliding connection with the connecting ribs (64). The pillars (72) have multiple mounting slots (721). A limiting sleeve (73) is welded on the connecting ribs (64) at the position corresponding to the pillars (72). An insert plate (74) is inserted into the limiting sleeve (73). The insert plate (74) passes through the limiting sleeve (73) and is inserted into the mounting slot (721).

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