A counterforce frame device suitable for longitudinal prestress reinforcement of a shield tunnel

Abstract

A counterforce frame device suitable for longitudinal prestress reinforcement of a shield tunnel, comprising a shield segment (1), a through hydraulic jack limiting box, a steel hinge line steering plate (21), a compression support structure and a tension support structure. The through hydraulic jack limiting box is a cuboid four-side box structure composed of a cover plate, a bottom plate, a locking surface plate and a compression baffle. The compression support structure comprises a high-strength quick connector (8), a solid compression rod (6), a variable cross-section section compression rod (5) and a lockable universal head sleeve (4). The tension support structure comprises a telescopic limiting rod (9), a limiting rod telescopic device (10) and a lockable universal head sleeve. The counterforce frame device has the advantages of light weight, small size, high flexibility, simple installation and removal; overcomes the installation defects of the traditional counterforce frame device caused by gravity and cannot be quickly moved; solves the problem of longitudinal tension reinforcement at different positions in the circumferential direction of the shield tunnel.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction equipment technology, and in particular to a reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels. Background Technology

[0002] Shield tunnels are crucial underground transportation infrastructure in modern urban construction. However, during their construction and operation, shield segments inevitably face damage risks due to the complex external environment. For example, the impact of nearby construction, natural disasters like earthquakes, and long-term high-intensity use can all lead to varying degrees of longitudinal deformation in operating shield tunnels. When the deformation is within a controllable or remedial range, there is an urgent need to develop rapid longitudinal repair and reinforcement technologies for shield tunnels to address different levels of damage. Rapid longitudinal repair and reinforcement of shield tunnels inevitably faces the challenge of longitudinal tensioning and reinforcement between tunnel segments. To better address this issue, longitudinal external prestressed steel strands need to be installed at the tension points of the shield tunnel for tensioning to counteract the tensile force borne by the tunnel. Typically, a through-hole hydraulic jack is used to tension the external steel strands in the shield tunnel; however, currently, there is no through-hole hydraulic jack reaction frame device that can be used in conjunction with shield segments.

[0003] Therefore, in order to achieve longitudinal maintenance and reinforcement of the tensile deformation points of shield tunnels and ensure that the through-hole hydraulic jack can stably and safely perform tensioning operations on the external steel strands, it is essential to design a through-hole hydraulic jack reaction frame device that can be installed on the shield segments and can be quickly disassembled. Summary of the Invention

[0004] The purpose of this invention is to address the longitudinal maintenance and reinforcement of shield tunnels under tension deformation, ensuring that the through-hole hydraulic jack can stably and safely tension the external steel strands. This invention discloses a reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels.

[0005] The technical solution implemented by this invention is as follows: a reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels, comprising shield tunnel segments, a through-type hydraulic jack limit box, a steel hinged steering plate, a compression support structure, and a tension support structure; the compression support structure and the tension support structure are respectively connected by a spherical hinge joint, a limit rod buckle, and the through-type hydraulic jack limit box; the reaction frame device is fastened and connected to the shield tunnel segments by lockable universal head sleeves and longitudinal connecting bolts at the ends of the compression support structure and the tension support structure.

[0006] The through-hole hydraulic jack limiting box is a rectangular four-sided box structure composed of a cover plate, a bottom plate, a lock panel, and a pressure baffle. The box is equipped with two jack limiting slots for installing the through-hole hydraulic jack. The lock panel is equipped with limiting rod slots at both ends and a cover plate lock in the middle. The pressure baffle is equipped with spherical hinge joints at 45° angles on both sides along its length. The pressure baffle has two steel wire outlet holes, which are aligned with the ends of the through-hole hydraulic jack.

[0007] The pressure-bearing support structure includes a high-strength quick connector, a solid pressure rod, a variable cross-section pressure rod, and a lockable universal sleeve. Two identical sets of pressure-bearing support structures are respectively connected to spherical hinge joints on both sides of the length direction of the pressure baffle of the hydraulic jack limit box. The high-strength quick connector is installed at the end of the spherical hinge joint. The other end of the high-strength quick connector is connected to the solid pressure rod. The other end of the solid pressure rod is connected to the variable cross-section pressure rod via the high-strength quick connector. The other end of the variable cross-section pressure rod is connected to the lockable universal sleeve. The tension support structure includes a telescopic limit rod, a limit rod telescopic device, and a lockable universal head sleeve; two telescopic limit rods are respectively inserted into the limit rod slots at both ends of the limit rod lock panel of the through-hole hydraulic jack and connected to the limit rod telescopic device; the other ends of the two telescopic limit rods are respectively connected to the lockable universal head sleeve.

[0008] The steel strand turning plate is fixed to the middle of the shield segment by turning plate bolts. The bottom surface of the steel strand turning plate is curved so that it can fit against the shield segment wall. A directional pulley is installed on the steel strand turning plate, and the steel strand is connected to the through-type hydraulic jack through the directional pulley. The other end of the steel strand passes through the anchor hole of the special anchor through the directional pulley.

[0009] The lockable universal joint sleeve consists of a steel sleeve, a lockable joint, and a solid end; the diameter of the steel sleeve is manufactured according to the size of the longitudinal connecting bolt.

[0010] The variable cross-section section pressure bar connects the solid pressure bar with a diameter of 80cm and the solid end of the lockable universal head sleeve with a diameter of 60cm through a linear variable cross-section connection. It is integrally formed with high-strength steel and the lockable universal head sleeve.

[0011] The telescopic limit rod is a hollow cylinder with an inner diameter of 60cm. It is connected to the telescopic limit rod by a thread, and the length of the telescopic limit rod can be adjusted by rotation.

[0012] The limiting rod buckle consists of a buckle head and a buckle seat. When the buckle head is inserted into the buckle seat, the protruding small piece will be stuck in the groove, thereby achieving connection and fixation.

[0013] The jack limiting slot is fixed to the base plate and the cover plate respectively by bolts, and the concave curved surface of the jack limiting slot is just in contact with the surface of the through-type hydraulic jack.

[0014] The lock panel and the limiting rod are integrally formed, and the cover plate can be locked during operation by means of the cover plate lock on the lock panel.

[0015] The cover plate is hinged to the pressure baffle via a hinge, and opening and closing the cover plate facilitates the removal or replacement of the through-hole hydraulic jack; the base plate is connected to the pressure baffle and the lock panel via bolts.

[0016] The lower edge of the directional pulley is at the same height as the steel strand hole on the pressure baffle, and the directional pulley can keep the steel strand parallel to the shield tunnel segment wall at all times during the tensioning process.

[0017] The working principle of this invention is as follows: This invention uses shield tunnel segments to provide external support. When the through-type hydraulic jack is tensioning the steel strand, the through-type hydraulic jack is fixed by a reaction frame, and the reaction frame transmits the force to the shield tunnel segments; thus solving the problem of longitudinal tensioning and reinforcement between tunnel segments in shield tunnels.

[0018] The beneficial effects of this invention are as follows: (1) This invention overcomes the shortcomings of the traditional jack reaction frame fixing method, which is limited to a single method. The reaction frame device of this invention has the advantages of light weight, small size and high flexibility. By rotating the position of the spherical hinge joint, replacing the solid pressure bar of different lengths, adjusting the length of the telescopic limit bar through the limit bar telescopic device and controlling the lockable universal head sleeve, it can be flexibly adapted to different specifications of tunnel segments in the shield tunnel ring direction. Moreover, it can overcome its own gravity and be firmly installed on the tunnel segments on the side and top of the shield tunnel.

[0019] (2) The present invention has the advantages of simple and quick installation and disassembly. By controlling the tightening device of the lockable universal head sleeve, the longitudinal connecting bolts can be engaged and disengaged. The high-strength quick connector can be disassembled and connected to the pressure-bearing support structure. The coordinated operation of the lockable universal head sleeve and the high-strength quick connector can achieve the effect of quick installation and disassembly on the shield tunnel segments, thereby effectively improving the working efficiency of the through-type hydraulic jack for continuous tensioning of steel strands.

[0020] (3) This invention can be used in conjunction with a steel strand turning plate. The directional pulley can keep the steel strand parallel to the shield tunnel segment wall at all times during the tensioning process, thereby reducing the bending moment on the anchor and improving the safety and durability of the anchor during the tensioning process.

[0021] (4) The present invention can replace the telescopic limit rods of different heights to achieve the effect of adjusting the tilt angle of the through-type hydraulic jack. It can be better used in conjunction with the directional pulley, and the tilting tension of the through-type hydraulic jack can generate a beneficial component force to overcome the weight of the device itself.

[0022] In summary, the reaction frame device of the present invention has the advantages of being lightweight, small in size, highly flexible, and easy to install and disassemble; it overcomes the installation defect of traditional reaction frame devices that cannot be moved quickly due to gravity, and can be installed on the segments on the side and top of the shield tunnel despite gravity, thus solving the problem of longitudinal tensioning and reinforcement at different positions in the circumferential direction of the shield tunnel.

[0023] The reaction frame device of this invention is installed on the shield tunnel segments and works with specially designed anchors to tension steel strands between the segments. It can also be easily disassembled and assembled on the shield tunnel segments with the help of a track trolley according to construction requirements, so as to achieve the effect of quickly and accurately moving the reaction frame device to the next working position. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the installation of the present invention in conjunction with tunnel lining segments; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the pressure-bearing support structure of the present invention; Figure 4 This is a schematic diagram of the tension support structure of the present invention; Figure 5 This is a schematic diagram of the locking universal joint sleeve and the longitudinal connecting bolt of the tube segment of the present invention. Figure 6 This is a schematic diagram of the internal structure of the through-hole type hydraulic jack limit box of the present invention; Figure 7 This is a schematic diagram of the steel strand turning plate structure of the present invention; Figure 8 This is a schematic diagram of the reaction frame device of the present invention installed on the shield tunnel segment and connected to the anchor steel strand; Figure 9 This is a schematic diagram of a steel strand installed on an anchor. In the diagram, 1 is a tunnel segment; 2 is a longitudinal connecting bolt; 3 is a grouting hole; 4 is a lockable universal joint sleeve; 5 is a variable cross-section section pressure bar; 6 is a solid pressure bar; 7 is a spherical hinge joint; 8 is a high-strength quick connector; 9 is a telescopic limit rod; 10 is a limit rod expansion joint; 11 is a limit rod buckle; 12 is a through-type hydraulic jack; 13 is a jack handle; 14 is a jack limit slot; 15 is a cover plate; 16 is a cover plate handle; 17 is a base plate; 18 is a lock panel; 19 is a cover plate lock; 20 is a pressure baffle; 21 is a steel strand steering plate; 22 is a directional pulley; 23 is a steering plate handle; 24 is a steering plate bolt; 25 is a steel strand; and 26 is an anchor. Detailed Implementation

[0025] This embodiment discloses a reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels, comprising a shield segment 1, a through-type hydraulic jack limit box, a steel hinged steering plate 21, a compression support structure, and a tension support structure. The compression support structure and the tension support structure are respectively connected by a spherical hinge joint 7, a limit rod buckle 11, and the through-type hydraulic jack limit box.

[0026] The through-hole hydraulic jack limiting box of this embodiment is a rectangular four-sided box structure composed of a cover plate 15, a base plate 17, a locking panel 18, and a pressure-bearing baffle 20. The box contains two jack limiting slots 14 for installing the through-hole hydraulic jack 12; the locking panel 18 has limiting rod slots 11 at both ends of its outer surface and a cover plate lock 19 in the middle; spherical hinge joints 7 are provided at 45º angles on both sides of the pressure-bearing baffle along its length; the pressure-bearing baffle 20 has two steel wire outlet holes, the positions of which are aligned with the ends of the through-hole hydraulic jack.

[0027] The pressure-bearing support structure of this embodiment includes a high-strength quick connector 8, a solid pressure rod 6, a variable cross-section pressure rod 5, and a lockable universal sleeve 4. Two identical sets of pressure-bearing support structures are respectively connected to spherical hinged joints 7 on both sides of the length direction of the pressure baffle 20 of the hydraulic jack limit box; the high-strength quick connector 8 is installed at the end of the spherical hinged joint 7; the other end of the high-strength quick connector 8 is connected to the solid pressure rod 6; the other end of the solid pressure rod 6 is connected to the variable cross-section pressure rod 5 through the high-strength quick connector 8; the other end of the variable cross-section pressure rod 5 is connected to the lockable universal sleeve 4.

[0028] The tension support structure of this embodiment includes a telescopic limit rod 9, a limit rod telescopic device 10, and a lockable universal head sleeve 4. The two telescopic limit rods 9 are inserted into the limit rod slots 11 at both ends of the limit rod lock panel 18 of the through-hole hydraulic jack limit box and connected to the limit rod telescopic device 10; the other ends of the two telescopic limit rods 9 are respectively connected to the lockable universal head sleeve 4.

[0029] In this embodiment, the steel strand turning plate 21 is fixed to the middle of the shield segment 1 by the turning plate bolt 24. The bottom surface of the steel strand turning plate 21 is curved and can fit against the wall of the shield segment 1. A directional pulley 22 is installed on the steel strand turning plate 21, and the steel strand 25 is connected to the through-type hydraulic jack 12 through the directional pulley 22.

[0030] In this embodiment, the reaction frame device is fastened to the shield tunnel segment 1 by locking the universal head sleeve 4 at the end of the compression support structure and the tension support structure and the longitudinal connecting bolt 2.

[0031] like Figure 1 As shown, the entire reaction frame device is connected by four lockable universal head sleeves 4 on the compression support structure and the tension support structure to the longitudinal connecting bolts 2 on the shield segment 1, respectively. The steel strand turning plate 21 is threadedly connected to the grouting hole 3 on the shield segment 1 through the turning plate bolt 24.

[0032] like Figure 2 As shown, the entire reaction frame device consists of a through-hole hydraulic jack limit box, a compression support structure, and a tension support structure, and is an axisymmetric structure. The compression support structure and the tension support structure are connected to the through-hole hydraulic jack limit box by the spherical hinge joint 7 and the limit rod buckle 11, respectively, which can achieve the effect of quick assembly and disassembly of the reaction frame device.

[0033] like Figure 3 As shown, the pressure-bearing support structure consists of the spherical hinge joint 7, the high-strength quick connector 8, the solid pressure bar 6, the variable cross-section pressure bar 5, and the lockable universal head sleeve 4. The high-strength quick connector 8 allows for quick replacement of the solid pressure bar 6 of different lengths to accommodate different specifications of tunnel segments. The spherical hinge joint 7 can be rotated at different angles to adjust the position of the pressure-bearing support structure, enabling the lockable universal head sleeve 4 to more accurately and quickly engage with the longitudinal connecting bolts 2. During the tensioning of the steel strand by the through-type hydraulic jack 12, the pressure is transmitted to the pressure-bearing support structure through the pressure baffle 20.

[0034] like Figure 4As shown, the tension support structure consists of the telescopic limiting rod 9, the limiting rod telescopic device 10, and the lockable universal joint sleeve 4. The length of the telescopic limiting rod 9 can be adjusted by rotating the limiting rod telescopic device 10, allowing the telescopic limiting rod 9 to quickly adapt to shield tunnel segments of different specifications. The tension support structure can limit the movement of the limiting box of the through-hole hydraulic jack during operation, ensuring the safety of the through-hole hydraulic jack 12 during operation. Replacing the telescopic limiting rod 9 with different heights allows for adjustment of the tilt angle of the through-hole hydraulic jack 12, enabling better coordination with the directional pulley 22.

[0035] like Figure 5 As shown, the diameter of the lockable universal joint sleeve 4 is manufactured according to the size of the longitudinal connecting bolt 2, so that the two can be tightly engaged when they are connected. Before locking, the joint of the lockable universal joint sleeve 4 can rotate flexibly. After the working position is determined, the joint can be locked, and the lockable universal joint sleeve 4 will no longer rotate until the joint lock is released again. This allows the force transmitted from the pressure support structure to be more reasonably transferred to the shield tunnel segment 1.

[0036] like Figure 6 As shown, the through-type hydraulic jack limiting box consists of the limiting rod buckle 11, the through-type hydraulic jack 12, the jack handle 13, the jack limiting groove 14, the cover plate 15, the cover plate handle 16, the base plate 17, the lock panel 18, the cover plate lock 19, and the pressure baffle 20. The concave curved surface of the jack limiting groove 14 fits perfectly with the surface of the through-type hydraulic jack 12, ensuring that the through-type hydraulic jack 12 does not shift during operation. The through-type hydraulic jack 12 can be easily removed or placed in by pulling the jack handle 13. The cover plate 15 and the pressure baffle 20 are connected by a pivot, and the cover plate 15 can be closed and opened by pulling the cover plate handle 16. In operation, the cover lock 19 can lock the cover 15 and the lock panel 18, ensuring the integrity of the through-hole hydraulic jack limit box structure. The limit rod buckle 11 firmly fixes the retractable limit rod 9 to the through-hole hydraulic jack limit box, and the limit rod buckle 11 can be quickly opened and closed.

[0037] like Figure 7As shown, the steel strand turning plate 21 consists of the directional pulley 22, the turning plate handle 23, and the turning plate bolt 24. The turning plate bolt 24 is threadedly connected to the grouting hole 3. The turning plate handle 23 allows for convenient movement of the steel strand turning plate 21. The directional pulley 22 ensures that the steel strand 25 remains parallel to the shield tunnel segment wall during tensioning, thereby reducing the bending moment on the anchorage.

[0038] like Figure 8 As shown in the diagram, the reaction frame device of the present invention is connected to the anchor 26 installed on the adjacent shield tunnel segment via a steel strand 25. Figure 9 The two steel strands 25 shown are connected to the anchor 26.

Claims

1. A reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels, comprising shield segments, characterized in that, The device also includes a through-hole hydraulic jack limit box, a steel strand steering plate, a compression support structure, and a tension support structure; the compression support structure and the tension support structure are respectively connected by a spherical hinge joint and a limit rod buckle and the through-hole hydraulic jack limit box; The through-hole hydraulic jack limiting box is a rectangular four-sided box structure composed of a cover plate, a bottom plate, a lock panel, and a pressure baffle. The box is equipped with two jack limiting slots for installing the through-hole hydraulic jack. The lock panel is equipped with limiting rod slots at both ends and a cover plate lock in the middle. The pressure baffle is equipped with spherical hinge joints at 45° angles on both sides along its length. The pressure baffle has two steel strand outlet holes, which are aligned with the ends of the through-hole hydraulic jack. The pressure-bearing support structure includes a high-strength quick connector, a solid pressure rod, a variable cross-section pressure rod, and a lockable universal sleeve. Two identical sets of pressure-bearing support structures are respectively connected to spherical hinge joints on both sides of the length direction of the pressure baffle of the hydraulic jack limit box. The high-strength quick connector is installed at the end of the spherical hinge joint. The other end of the high-strength quick connector is connected to the solid pressure rod. The other end of the solid pressure rod is connected to the variable cross-section pressure rod via the high-strength quick connector. The other end of the variable cross-section pressure rod is connected to the lockable universal sleeve. The tension support structure includes a telescopic limit rod, a limit rod telescopic device, and a lockable universal head sleeve; two telescopic limit rods are respectively inserted into the limit rod slots at both ends of the limit rod lock panel of the through-hole hydraulic jack limit box and connected to the limit rod telescopic device; the other ends of the two telescopic limit rods are respectively connected to the lockable universal head sleeve. The steel strand turning plate is fixed to the middle of the shield segment by turning plate bolts. The bottom surface of the steel strand turning plate is a curved surface that fits against the wall of the shield segment. A directional pulley is installed on the steel strand turning plate, and the steel strand is connected to the through-type hydraulic jack through the directional pulley. The reaction frame device is fastened to the shield tunnel segment by locking universal head sleeves and longitudinal connecting bolts at the ends of the compression support structure and the tension support structure.

2. The reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The lockable universal joint sleeve consists of a steel sleeve, a lockable joint, and a solid end; the diameter of the steel sleeve is manufactured according to the size of the longitudinal connecting bolt.

3. A reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The variable cross-section section pressure bar connects the solid pressure bar with a diameter of 80cm and the solid end of the lockable universal head sleeve with a diameter of 60cm through a linear variable cross-section connection. It is integrally formed with high-strength steel and the lockable universal head sleeve.

4. A reaction frame device suitable for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The telescopic limit rod is a hollow cylinder with an inner diameter of 60cm. It is connected to the telescopic limit rod by a thread, and the length of the telescopic limit rod can be adjusted by rotation.

5. A reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The limiting rod buckle consists of a buckle head and a buckle seat. When the buckle head is inserted into the buckle seat, the protruding small piece will be stuck in the groove, thereby achieving connection and fixation.

6. A reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The jack limiting slot is fixed to the base plate and the cover plate respectively by bolts, and the concave curved surface of the jack limiting slot is just in contact with the surface of the through-type hydraulic jack.

7. A reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The lock panel and the limiting rod are integrally formed, and the cover plate can be locked during operation by means of the cover plate lock on the lock panel.

8. A reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The cover plate is hinged to the pressure baffle via a hinge, and opening and closing the cover plate facilitates the removal or replacement of the through-hole hydraulic jack; the base plate is connected to the pressure baffle and the lock panel via bolts.

9. A reaction frame device for longitudinal prestressed reinforcement of shield tunnels according to claim 1, characterized in that, The lower edge of the directional pulley is at the same height as the steel strand hole on the pressure baffle, and the directional pulley can keep the steel strand parallel to the shield tunnel segment wall at all times during the tensioning process.

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