An auxiliary prefabricated part for longitudinal assembly of a tunnel steel structure support

Abstract

An auxiliary prefabricated part for longitudinal assembly of a tunnel steel structure support, comprising a fixed rod, a translation rod and two rotating rods, the fixed rod being welded to the inner arc surface of a ring-shaped steel support, the two ends of the fixed rod being rotatably connected to the two rotating rods, the middle part of the fixed rod being welded with a sliding groove, the middle part of the translation rod being provided with a sliding block matched with the sliding groove, the rotating rod being connected with a handle, the handle being capable of driving the rotating rod to rotate between a pre-assembly position and a post-assembly position, the sliding block being connected with a hand pushing block, the hand pushing block being capable of driving the translation rod and the sliding block to reciprocate between the pre-assembly position and the post-assembly position. When the adjacent steel structures are in the butt joint position, the L-shaped bending part of the rotating rod reaches the inner arc surface of another ring-shaped steel support by adjusting the position of the rotating rod and the translation rod, and the close connection between the adjacent steel structures is realized by limiting the free movement of the rotating rod and the translation rod, without the need for any other large equipment to assist, thereby saving cost.

Description

Technical Field

[0001] This invention relates to the field of tunnel steel structure support, and more particularly to an auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support. Background Technology

[0002] During tunnel excavation, support is required to prevent accidents such as tunnel settlement or collapse. Steel structure support is a commonly used tunnel support structure, typically using corrugated steel plates and annular steel plates to form a ring-shaped sheet structure. Multiple annular sheet structures are gradually spliced ​​together from the bottom sides of the newly excavated tunnel location towards the arch to form an integral ring-shaped steel support structure. Then, as the tunnel continues to be excavated, adjacent ring-shaped steel support structures are spliced ​​longitudinally. In the above construction process, due to the large joint length of adjacent ring-shaped steel support structures, large auxiliary equipment is required to adjust the joint position of adjacent ring-shaped steel support structures to ensure a tight connection between them. The actual construction is time-consuming, labor-intensive, and costly. Summary of the Invention

[0003] The purpose of this invention is to provide an auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support, which is easy to operate, requires no large auxiliary equipment, and effectively achieves a tight connection between adjacent steel structures.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support, used to be set at the longitudinal docking position of two adjacent annular steel supports. The prefabricated component includes a fixed rod, a translation rod, and two rotating rods. The fixed rod is welded to the inner arc surface of an annular steel support. The length direction of the fixed rod is perpendicular to the axial direction of the annular steel support. The two ends of the fixed rod along the length direction are respectively rotatably connected to the two rotating rods. A groove is welded to the middle of the fixed rod along the length direction. The length direction of the groove is parallel to the axial direction of the annular steel support. The translation rod is located on the side of the fixed rod near the edge where the annular steel support is longitudinally docked. The length direction of the translation rod is parallel to the length direction of the fixed rod. A slider matching the groove is provided in the middle of the translation rod. A handle is connected to the end of the rotating rod near the fixed rod. The handle allows the rotating rod to rotate between the pre-assembly position and the post-assembly position. A push block is connected to the slider. The push block allows the translation rod and the slider to reciprocate along the slide groove between the pre-assembly position and the post-assembly position. When in the pre-assembly position, the length direction of the rotating rod is parallel to the length direction of the fixed rod. The end of the rotating rod away from the fixed rod has an L-shaped bend extending towards the translation rod. A limit groove is provided on the inner side of the L-shaped bend. Limiting protrusions are provided at both ends of the translation rod along its length. When in the pre-assembly position, the projections of the translation rod and the two rotating rods along the radial direction of the annular steel support are all located on the inner arc surface of the annular steel support to which the fixed rod is connected. When rotated to the post-assembly position, the L-shaped bends of the two rotating rods are located on the inner arc surface of the adjacent annular steel support, and the limiting grooves of the two L-shaped bends face the limiting protrusions at both ends of the translation rod. When moving along the slide to the post-assembly position, the sidewalls of the two limiting protrusions can respectively fit against the inner walls of the two limiting grooves, thereby restricting the rotation of the rotating rod. The slider has a positioning hole, in which a countersunk screw is placed. The bottom of the slide has a through hole, and a positioning nut is welded to the bottom surface of the slide away from the slider. The threaded hole of the positioning nut is aligned with the through hole of the slide. When the slider is in the post-assembly position, the countersunk screw can pass through the through hole and be screwed into the positioning nut, thereby restricting the movement of the translation rod.

[0005] Preferably, the slider has two positioning holes, and the bottom surface of the groove is welded with two positioning nuts.

[0006] Preferably, a drive gear is installed in the inner cavity of the end of the fixed rod, and a driven gear is installed in the inner cavity of the end of the rotating rod. The handle is connected to the axle of the drive gear, and the driven gear and the drive gear mesh with each other. When the handle drives the drive gear to rotate, the driven gear can drive the rotating rod to rotate around the axle of the drive gear.

[0007] Preferably, the fixed rod has positioning blocks at both ends, and the rotating rod has positioning grooves on its side walls. When the rotating rod is rotated to the spliced ​​position, the positioning blocks can enter the positioning grooves and fit together to limit the position.

[0008] According to the above technical solution, the beneficial effects of the present invention are: The auxiliary prefabricated components of this invention have a simple structure and low cost. The fixed rods, rotating rods, translation rods, and sliding grooves are all components that can be obtained through simple machining. During construction, the fixed rods only need to be welded to the inner arc surface of the annular steel support, and care should be taken to control the projection positions of the rotating rods and translation rods located in the pre-assembly position. Before longitudinal assembly, multiple auxiliary prefabricated components can be set at different positions on the inner arc surface of the annular steel support. During the longitudinal assembly process, when the adjacent steel structures are in the docking position, by adjusting the positions of the rotating rods and translation rods of the multiple auxiliary prefabricated components, the L-shaped bend of the rotating rod can reach the inner arc surface of another annular steel support. By restricting the free movement of the rotating rods and translation rods, a tight connection between adjacent steel structures can be achieved, making the longitudinally assembled steel support structure less prone to deformation and greatly enhancing the overall integrity of the structure. Compared with traditional connection methods, it is simple to operate, requires no other large equipment for assistance, and can greatly shorten construction time and save costs. Attached Figure Description

[0009] Figure 1A schematic diagram of the prefabricated components and steel structure support; Figure 2 A 3D view of the prefabricated components after assembly; Figure 3 This is a front view of the prefabricated component after assembly. Figure 4 The front view of the prefabricated component before assembly; Figure 5 A perspective view of the connection point between the fixed rod and the rotating rod; Figure 6 This is a magnified view of a section of the groove and slider; Figure 7 This is a perspective view of the groove and the slider.

[0010] The markings in the diagram are: 1. Ring steel support, 2. Precast component, 3. Fixed rod, 4. Rotating rod, 5. Translation rod, 6. Slide groove, 7. Sliding block, 8. Limiting protrusion, 9. Limiting groove, 10. Positioning block, 11. Handle, 12. Driving gear, 13. Driven gear, 14. Hand push block, 15. Positioning hole, 16. Countersunk screw, 17. Positioning nut. Detailed Implementation

[0011] Referring to the attached diagram, the specific implementation method is as follows: An auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support, such as... Figure 1 As shown, the precast component 2 is set at the longitudinal joint position of two adjacent annular steel supports 1, and usually multiple components are set at different positions on the inner arc surface.

[0012] like Figure 2-4 As shown, the precast component 2 includes a fixed rod 3, a translation rod 5, and two rotating rods 4. The fixed rod 3 is welded to the inner arc surface of an annular steel support 1. The length direction of the fixed rod 3 is perpendicular to the axial direction of the annular steel support 1. The two ends of the fixed rod 3 along its length direction are rotatably connected to the two rotating rods 4 respectively. A groove 6 is welded to the middle of the fixed rod 3 along its length direction. The length direction of the groove 6 is parallel to the axial direction of the annular steel support 1. The translation rod 5 is located on the side of the fixed rod 3 near the edge where it is longitudinally joined with the annular steel support 1. The length direction of the translation rod 5 is parallel to the length direction of the fixed rod 3. A slider 7 matching the groove 6 is provided in the middle of the translation rod 5.

[0013] A handle 11 is connected to one end of the rotating rod 4 near the fixed rod 3. The handle 11 can drive the rotating rod 4 to rotate between the pre-assembly position and the post-assembly position. A push block 14 is connected to the slider 7. The push block 14 can drive the translation rod 5 and the slider 7 to reciprocate between the pre-assembly position and the post-assembly position along the slide groove 6.

[0014] like Figure 4As shown, when in the pre-assembly position, the length direction of the rotating rod 4 is parallel to the length direction of the fixed rod 3, and the end of the rotating rod 4 away from the fixed rod 3 has an L-shaped bend extending toward the translation rod 5. A limit groove 9 is provided on the inner side of the L-shaped bend, and the translation rod 5 has limit protrusions 8 at both ends along the length direction.

[0015] When in the pre-assembly position, the radial projections of the translation rod 5 and the two rotating rods 4 along the annular steel support 1 are all located on the inner arc surface of the annular steel support 1 connected to the fixed rod 3. When rotated to the post-assembly position, the L-shaped bends of the two rotating rods 4 are located on the inner arc surface of the adjacent annular steel support 1, and the limiting grooves 9 of the two L-shaped bends face the limiting protrusions 8 at both ends of the translation rod 5. When moving along the slide 6 to the post-assembly position, the sidewalls of the two limiting protrusions 8 can respectively fit into contact with the inner walls of the two limiting grooves 9, thereby restricting the rotation of the rotating rods 4.

[0016] like Figure 6-7 As shown, the slider 7 has two positioning holes 15, and countersunk screws 16 are placed in the two positioning holes 15 respectively. The bottom of the groove 6 has two through holes. Two positioning nuts 17 are welded to the bottom surface of the groove 6 away from the slider 7. The threaded holes of the two positioning nuts 17 are aligned with the two through holes. When the slider 7 is in the spliced ​​position, the two countersunk screws 16 can pass through the through holes and be screwed into the two positioning nuts 17 respectively, thereby restricting the movement of the translation rod 5.

[0017] like Figure 5 As shown, a drive gear 12 is installed in the inner cavity of the end of the fixed rod 3, and a driven gear 13 is installed in the inner cavity of the end of the rotating rod 4. The handle 11 is connected to the axle of the drive gear 12. The driven gear 13 and the drive gear 12 mesh with each other. When the handle 11 drives the drive gear 12 to rotate, the driven gear 13 can drive the rotating rod 4 to rotate around the axle of the drive gear 12.

[0018] like Figure 5 As shown, positioning blocks 10 are provided at both ends of the fixed rod 3, and positioning grooves are provided on the side wall of the rotating rod 4. When the rotating rod 4 is rotated to the spliced ​​position, the positioning blocks 10 can enter the positioning grooves and fit together to limit the position.

[0019] During tunnel excavation, the tunnel face is pre-reinforced to ensure its stability. The steel structure is erected and assembled starting from the tunnel arch foot. During installation, the circumferential structure is assembled first, using mechanical grippers to position the steel structure at the design location. The steel structure at the arch foot is connected to the cast-in-place concrete pier via anchor bolts and steel connectors to ensure arch foot stability. Once the steel structure is accurately positioned, it is stabilized using supports. Adjacent circumferential steel structures are connected via flanges and high-strength bolts. This step requires real-time monitoring and correction of the steel structure's position to prevent any deviation. The steel structure is assembled symmetrically from both ends towards the center, finally completing the circumferential assembly at the arch crown.

[0020] After the circumferential assembly of the steel structure is completed, longitudinal assembly is carried out. During longitudinal assembly, the assembly still starts from the arch foot and proceeds symmetrically towards the middle. During the longitudinal assembly process, when adjacent steel structures are in the docking position, by adjusting the positions of the rotating rods and translation rods of multiple auxiliary prefabricated components, the L-shaped bend of the rotating rod can be made to reach the inner arc surface of another ring-shaped steel support. By restricting the free movement of the rotating rods and translation rods, a tight connection between adjacent steel structures can be achieved.

Claims

1. An auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support, used for setting at the longitudinal joint position of two adjacent annular steel supports (1), characterized in that: The precast component (2) includes a fixed rod (3), a translation rod (5), and two rotating rods (4). The fixed rod (3) is welded to the inner arc surface of an annular steel support (1). The length direction of the fixed rod (3) is perpendicular to the axial direction of the annular steel support (1). The two ends of the fixed rod (3) along the length direction are rotatably connected to the two rotating rods (4). A groove (6) is welded to the middle of the fixed rod (3) along the length direction. The length direction of the groove (6) is parallel to the axial direction of the annular steel support (1). The translation rod (5) is located on the side of the fixed rod (3) near the edge where the annular steel support (1) is longitudinally joined. The length direction of the translation rod (5) is parallel to the length direction of the fixed rod (3). A slider (7) matching the groove (6) is provided in the middle of the translation rod (5). A handle (11) is connected to one end of the rotating rod (4) near the fixed rod (3). The handle (11) can drive the rotating rod (4) to rotate between the pre-assembly position and the post-assembly position. A push block (14) is connected to the slider (7). The push block (14) can drive the translation rod (5) and the slider (7) to reciprocate between the pre-assembly position and the post-assembly position along the slide groove (6). When it is in the pre-assembly position, the length direction of the rotating rod (4) is parallel to the length direction of the fixed rod (3). The end of the rotating rod (4) away from the fixed rod (3) has an L-shaped bend extending toward the translation rod (5). A limit groove (9) is opened on the inner side of the L-shaped bend. Limiting protrusions (8) are provided at both ends of the translation rod (5) along the length direction. When in the pre-assembly position, the projections of the translation rod (5) and the two rotating rods (4) along the radial direction of the annular steel support (1) are all located on the inner arc surface of the annular steel support (1) connected to the fixed rod (3); when rotated to the post-assembly position, the L-shaped bends of the two rotating rods (4) are all located on the inner arc surface of the adjacent annular steel support (1), and the limiting grooves (9) of the two L-shaped bends face the limiting protrusions (8) at both ends of the translation rod (5); when moved along the slide (6) to the post-assembly position, the sidewalls of the two limiting protrusions (8) can respectively interact with the two limiting grooves. (9) The inner wall of the sliding block (7) is in contact with the sliding block (4), thereby restricting the rotation of the rotating rod (4); the sliding block (7) is provided with a positioning hole (15), and a countersunk screw (16) is placed in the positioning hole (15). The bottom of the sliding groove (6) is provided with a through hole, and a positioning nut (17) is welded to the bottom surface of the sliding groove (6) away from the sliding block (7). The threaded hole of the positioning nut (17) is aligned with the through hole of the sliding groove (6). When the sliding block (7) is in the spliced ​​position, the countersunk screw (16) can pass through the through hole and be screwed into the positioning nut (17), thereby restricting the movement of the translation rod (5).

2. The auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support according to claim 1, characterized in that: Two positioning holes (15) are provided on the slider (7), and two positioning nuts (17) are welded to the bottom surface of the groove (6).

3. The auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support according to claim 1, characterized in that: A drive gear (12) is installed in the inner cavity of the end of the fixed rod (3), and a driven gear (13) is installed in the inner cavity of the end of the rotating rod (4). The handle (11) is connected to the axle of the drive gear (12). The driven gear (13) and the drive gear (12) mesh with each other. When the handle (11) drives the drive gear (12) to rotate, the driven gear (13) can drive the rotating rod (4) to rotate around the axle of the drive gear (12).

4. The auxiliary prefabricated component for longitudinal assembly of tunnel steel structure support according to claim 1, characterized in that: The fixed rod (3) has positioning blocks (10) at both ends, and the rotating rod (4) has a positioning groove on its side wall. When the rotating rod (4) is rotated to the spliced ​​position, the positioning blocks (10) can enter the positioning groove and fit together to limit the position.

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