A high strength steel composite structure mounting device

Abstract

The application relates to the technical field of underground space steel-concrete structure support reinforcement, and particularly discloses a high-strength steel-concrete structure mounting device which comprises a foldable annular support frame, the annular support frame comprises a plurality of arc-shaped rods, the arc-shaped rods are sequentially hingedly connected in a head-to-tail mode, one transition rod is hingedly connected to each of the two arc-shaped rods at two ends, a base is hingedly connected to each of the transition rods, and two arc-shaped beams are rotationally connected between the two bases. The foldable annular support frame is greatly reduced in volume in a folded state, so that the folded annular support frame can easily pass through the inner hole of a previously installed and fixed annular support frame; the conical hole formed by the combination of the inclined rods when the arc-shaped beams are unfolded is used as a precise positioning reference, so that the anchor rod hole can be conveniently and accurately drilled and the grouting anchor rod can be installed.

Description

Technical Field

[0001] This invention relates to the field of underground space steel-concrete structure support and reinforcement technology, and in particular to a high-strength steel-concrete structure installation device. Background Technology

[0002] Fault fracture zones are common adverse geological conditions in tunnel construction. These areas feature fractured surrounding rock with poor self-stability, making them prone to large-scale deformation and even collapse, posing a serious threat to construction safety and project quality. To ensure tunnel stability in fault fracture zone sections, high-strength steel-concrete composite structures are typically used for support and reinforcement. Currently, tunnel steel-concrete support structures mainly employ composite support systems combining steel arch frames or ring-shaped steel support frames with shotcrete. CN202021712965.0 discloses a steel-concrete composite tunnel support system using a steel-concrete composite structure, in which multiple steel-concrete arch frames are arranged longitudinally along the tunnel. Each arch frame comprises multiple spliced ​​square steel sections, with concrete poured into the steel pipes. Shotcrete is used to fill the spaces between adjacent arch frames, ultimately forming a steel-concrete composite support structure.

[0003] In the aforementioned tunnel support system, with the tunnel's inner diameter remaining essentially unchanged, when multiple annular steel arches are installed longitudinally along the tunnel, the previously installed arches already occupy the tunnel's internal space. Subsequent annular support frames struggle to pass through these already installed arches during transportation and assembly, increasing construction difficulty and time costs. Although existing technologies employ multi-segment splicing for easier single-segment transportation, flexible passage between adjacent arches remains impossible after overall assembly, impacting construction efficiency. Furthermore, the aforementioned tunnel support system primarily provides passive support and reinforcement from the tunnel's inner wall, lacking proactive measures for internal treatment of fault fracture zones. The surrounding rock in fault fracture zones often contains numerous fissures and cavities. The wall support structure formed solely by steel arches and shotcrete is insufficient to fundamentally fill the fractured areas within the surrounding rock, improve its overall stability, and enhance its self-bearing capacity. If external loads are significant or the surrounding rock continues to deform, the support structure may experience localized failure due to uneven stress. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-strength steel-concrete structure installation device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-strength steel-concrete structure installation device includes a foldable annular support frame. The annular support frame includes multiple arc-shaped rods, which are sequentially hinged end to end. A transition rod is hinged to each of the two arc-shaped rods at both ends. A base is hinged to each transition rod, and two arc-shaped beams are rotatably connected between the two bases.

[0006] Preferably, both ends of the arc-shaped beam are fixedly connected to rotating shafts, and each base is provided with a rotating hole, with the rotating shafts rotatably connected in the rotating holes one by one.

[0007] Preferably, a set of diagonal rods is fixedly connected to each of the two arc-shaped beams, and the two sets of diagonal rods are set one-to-one. Each diagonal rod has an arc-shaped groove at one end. As the arc-shaped beams rotate, the corresponding diagonal rods can contact each other one-to-one. When the corresponding diagonal rods contact each other, the two arc-shaped grooves combine to form a conical hole.

[0008] Preferably, each curved beam has a set of locking holes on its side. The locking holes are staggered with the diagonal bars. When the corresponding diagonal bars come into contact, the two sets of locking holes are coaxial and correspond one-to-one. At this time, a locking rod is inserted into the corresponding locking hole, and the curved beam is restricted from rotating.

[0009] Preferably, anchor bolt holes are drilled into the inner wall of the tunnel at the conical hole, and grouting anchor bolts are driven into the anchor bolt holes.

[0010] Preferably, one end of the grouting anchor is provided with a conical ring. When the grouting anchor is inserted to the bottom of the anchor hole, the conical ring is located exactly inside the conical hole and fits snugly against it. After the grouting anchor is driven in, the conical ring secures the grouting anchor between the two inclined rods, preventing the grouting anchor from moving during the grouting process.

[0011] The beneficial effects of the present invention are as follows: The foldable ring support frame of the present invention has a significantly reduced volume when folded, which allows the folded ring support frame to easily pass through the inner hole of the installed and fixed preceding ring support frame; The present invention uses the conical hole formed by the combination of inclined bars when the arc beam is unfolded as a precise positioning reference, which can conveniently and accurately drill anchor bolt holes and install grouting anchor bolts. Attached Figure Description

[0012] Figure 1 This is a perspective view of the folded annular support frame of the present invention; Figure 2 This is a front view of the folded annular support frame of the present invention; Figure 3 This is a perspective view of the unfolded annular support frame of the present invention; Figure 4 This is a schematic diagram of the basic structure after two diagonal bars come into contact. Figure 5 yes Figure 4 Enlarged view of point A; Figure 6 This is a schematic diagram of the structure of the ring support frame after it has been folded and is located inside the tunnel; Figure 7 This is a schematic diagram of the structure of the ring support frame inside the tunnel after it has been deployed. Figure 8 This is a diagram showing the usage status of the ring-shaped support frame inside the tunnel; Figure 9 yes Figure 8 Enlarged view of point N. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] Example 1 like Figures 1 to 9 As shown in the figure, this embodiment provides a high-strength steel-concrete structure installation device, including a foldable annular support frame. The annular support frame is used to be set at intervals along the longitudinal direction of the tunnel 9, and forms an integral steel-concrete structure support body after spraying concrete.

[0015] The annular support frame includes multiple arc-shaped rods 1, which are sequentially hinged end-to-end via hinge shafts, forming an arc-shaped chain. A transition rod 2 is hinged to each of the two arc-shaped rods 1 at both ends of the chain. A base 3 is hinged to each transition rod 2, and two arc-shaped beams 4 are rotatably connected between the two bases 3. Rotating shafts 42 are fixedly connected to both ends of the arc-shaped beams 4. Each base 3 has a rotating hole, and the rotating shafts 42 are rotatably connected within these holes. The rotating shafts 42 guide the rotation of the arc-shaped beams 4, facilitating their rotation and ensuring their stability under the pressure of surrounding rock. In this embodiment, the arc-shaped rods 1, arc-shaped beams 4, and bases 3 can all be made of high-strength alloy structural steel or I-beams through cold bending to ensure sufficient bending stiffness.

[0016] When folding the arc-shaped rod 1, the two arc-shaped beams 4 must first be rotated manually or with the aid of tools, so that the outer arc surfaces of the two arc-shaped beams 4 face the center of the annular support frame and the two arc-shaped beams 4 are in contact. This provides sufficient space for the rotation of multiple arc-shaped rods 1, effectively incorporating the arc-shaped beams 4 into the internal contour space of the annular support frame. This releases the space originally occupied by the arc-shaped beams 4, providing ample clearance for the folding and rotation of multiple arc-shaped rods 1. The operator can then gather and fold the multiple arc-shaped rods 1 inward, thereby significantly reducing the space occupied by the annular support frame. The folded annular support frame can then be easily transported along the axial direction of tunnel 9 through the inner hole of the installed and unfolded annular support frame to the next installation station.

[0017] Two sets of diagonal braces 5 are fixedly connected to the sides of the two arc-shaped beams 4. The two sets of diagonal braces 5 are set one-to-one, and each diagonal brace 5 has an arc-shaped groove 51 at the end away from the arc-shaped beam 4. The steps for changing the ring support frame from the folded state to the unfolded state are as follows: First, unfold the multiple arc-shaped rods 1 gathered together along the circumference of the inner wall of the tunnel so that the arc-shaped rods 1 basically fit the inner wall contour of the tunnel 9. Then, rotate the two arc-shaped beams 4 in the opposite direction so that the arc-shaped beams 4 are opened from the center position towards the inner wall of the tunnel 9. As the arc-shaped beams 4 are rotated and opened, on the one hand, the arc-shaped beams 4 themselves fit against the inner wall of the tunnel 9. On the other hand, when the arc-shaped beams 4 rotate, they generate a compressive force on the base 3 and the transition rod 2. Under the transmission of the base 3 and the transition rod 2, this compressive force generates an outward compressive force on the entire arc-shaped rod 1, forcing each arc-shaped rod 1 to fully rotate into place and tightly press against the inner wall of the tunnel. When the curved beam 4 rotates into position, the two sets of diagonal braces 5 also move with the curved beam 4 and come into contact with each other. At this time, the two opposing curved grooves 51 combine to form a complete conical hole. At the same time, the two sets of diagonal braces 5 and the inner wall of the tunnel 9 enclose a reinforced space with a cross-section that is roughly "triangular".

[0018] To lock the annular support frame, this embodiment provides a set of locking holes 41 on the side of each arc beam 4. The locking holes 41 and the diagonal bars 5 are staggered along the length of the arc beam 4. When the corresponding diagonal bars 5 contact each other, the locking holes 41 on the two sets of arc beams 4 also reach a coaxial state. At this time, the operator inserts the locking rod 7 into the coaxial locking hole 41. The insertion of the locking rod 7 into the locking hole 41 restricts the arc beam 4 from rotating again, ensuring that the annular support frame will not shrink or deform when subjected to the impact of shotcrete and the pressure of the surrounding rock. In this embodiment, the locking rod 7 is made of high-strength threaded steel to provide strong longitudinal tensile restraint. Since the locking rod 7 extends along the axial direction of the tunnel 9, it acts as a "steel skeleton" for longitudinal reinforcement or tie bars in the subsequently formed steel-concrete structure, enhancing the longitudinal tensile and shear resistance between multiple annular support frames.

[0019] In this embodiment, the location of the fault fracture zone around tunnel 9 is first detected using a detection device. When installing the annular support frame, the arc beam 4 in the annular support frame is positioned towards the fault fracture zone. After the annular support frame is unfolded and locked in place, the interior of the fault fracture zone is reinforced by grouting. Specifically, a conical hole formed by two inclined rods 5 is used as a positioning reference and a drill guide hole. An anchor bolt hole is drilled deep into the inner wall of tunnel 9 along the central axis of the conical hole using a rock drill or drilling rig. The depth of the anchor bolt hole needs to penetrate the loosened zone of the surrounding rock and enter a relatively stable rock layer or pass through the fracture zone area. Then, grouting anchor bolts 6 are driven into the anchor bolt hole. A conical ring 61 is welded to one end of the grouting anchor bolt 6. When the grouting anchor bolt 6 is driven to the designed depth, the conical ring 61 is precisely wedged into the conical hole composed of two arc grooves 51 and fits tightly against the hole wall of the conical hole. This conical mating structure effectively locks the tail end of the grouting anchor rod 6, preventing it from being pushed out or shaken by the reaction force during subsequent high-pressure grouting.

[0020] After all the annular support frames of the fault fracture zone are fully installed and the grouting anchors 6 are inserted, cement grout or chemical grout is injected into the surrounding rock under high pressure through the grouting pipes of the grouting anchors 6. Under pressure, the grout penetrates and fills the fissures, joints and cavities in the geological layers surrounding tunnel 9, actively reinforcing the fault fracture zone from the inside, improving the physical and mechanical properties of the surrounding rock, and enhancing the self-bearing capacity of the surrounding rock.

[0021] After the concrete grout has initially set, concrete is sprayed onto the inner wall of tunnel 9. The sprayed concrete covers the arc-shaped rod 1, the arc-shaped beam 4, and the "triangular" reinforced space. The concrete forms a continuous inner wall reinforcement layer on the surface of tunnel 9. At the "triangular" reinforced space, due to the presence of the diagonal rod 5 and the locking rod 7, the concrete fills the "triangular" reinforced space and forms a raised reinforcing rib with a large cross-sectional dimension. At this time, the exposed end of the grouting anchor 6 and the conical ring 61 are also completely wrapped and anchored in the concrete of the raised reinforcing rib. Through the connecting action of the grouting anchor 6, the deep grouting reinforcement zone of the surrounding rock, the grouting anchor body, and the inner wall support layer of the steel-concrete structure are effectively connected, so that the shallow support structure and the deep surrounding rock form a synergistic whole structure, which greatly improves the long-term stability of the tunnel in the fault fracture zone.

[0022] It should be noted that the above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural modifications made based on the description and drawings of this invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this invention.

Claims

1. A high-strength steel-concrete structure installation device, characterized in that: The device includes a foldable ring support frame, which includes multiple arc rods (1) that are sequentially hinged end to end. A transition rod (2) is hinged to each of the two arc rods (1) at both ends. A base (3) is hinged to each of the transition rods (2). Two arc beams (4) are rotatably connected between the two bases (3).

2. The high-strength steel-concrete structure installation device according to claim 1, characterized in that: Both ends of the arc beam (4) are fixedly connected to rotating shafts (42), and each base (3) is provided with a rotating hole, with the rotating shafts (42) rotating in the rotating holes one by one.

3. The high-strength steel-concrete structure installation device according to claim 1, characterized in that: Two sets of diagonal rods (5) are fixedly connected to each of the two arc beams (4). The two sets of diagonal rods (5) are set one-to-one. Each diagonal rod (5) has an arc groove (51) at one end. As the arc beam (4) rotates, the corresponding diagonal rods (5) can contact each other one-to-one. When the corresponding diagonal rods (5) contact each other, the two arc grooves (51) combine to form a conical hole.

4. The high-strength steel-concrete structure installation device according to claim 3, characterized in that: Each of the arc beams (4) has a set of locking holes (41) on its side. The locking holes (41) are staggered with the inclined rods (5). When the corresponding inclined rods (5) come into contact, the two sets of locking holes (41) are coaxial and correspond one to one. At this time, a locking rod (7) is inserted into the corresponding locking hole (41), and the arc beam (4) is restricted from rotating.

5. The high-strength steel-concrete structure installation device according to claim 3, characterized in that: Drill anchor bolt holes into the inner wall of the tunnel (9) at the conical hole, and drive grouting anchor bolts (6) into the anchor bolt holes.

6. The high-strength steel-concrete structure installation device according to claim 4, characterized in that: One end of the grouting anchor rod (6) is provided with a conical ring (61). When the grouting anchor rod (6) extends to the bottom of the anchor rod hole, the conical ring (61) is located inside the conical hole and fits into the conical hole.

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