A node reinforced fabricated steel pipe concrete support structure
By using a composite connection method of steel tenons and steel ring plates, the problems of low construction efficiency and stress concentration at joints in steel pipe concrete supports in soft rock roadways and tunnels are solved, achieving efficient and stable support effects and adapting to complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENYANG JIANZHU UNIVERSITY
- Filing Date
- 2025-08-08
- Publication Date
- 2026-06-26
AI Technical Summary
Existing steel-concrete composite supports have low construction efficiency in soft rock roadways and tunnels, resulting in stress concentration at joints and difficulty in ensuring the quality of concrete pouring, thus failing to effectively support complex environments.
The system employs a dual mechanical connection method of steel tenons and steel ring plates. Precast steel pipe concrete segments are manufactured in the factory and assembled on site. The steel tenons are inserted into slots for connection, and the steel ring plates are fixed with high-strength bolts to form a node structure with mechanical interlocking and rigid wrapping.
It improved construction efficiency, ensured the strength and stability of nodes, enhanced the load-bearing capacity of the support structure, adapted to the needs of different roadway cross sections, and reduced the construction period and safety hazards.
Smart Images
Figure CN224413647U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of underground engineering support technology, specifically a node-reinforced prefabricated steel pipe concrete support structure, which is suitable for reinforced support of soft rock roadways or tunnels. Background Technology
[0002] As the depth of underground resource extraction continues to increase, tunnel engineering support faces more complex environments such as high stress, extremely soft rock, and strong mining activity. Steel supports, as a commonly used reinforced support method in soft rock tunnels and ducts, can effectively control the deformation of the surrounding rock. Steel supports can be divided into structural steel (such as U-shaped steel and I-beams) supports, lattice steel frames, and steel-concrete composite supports. Among them, steel-concrete composite supports utilize steel pipes to confine concrete, providing greater load-bearing capacity and rigidity, with a load-bearing capacity 2 to 5 times that of traditional structural steel supports. Currently, the construction of steel-concrete composite supports in soft rock tunnels mainly adopts on-site concrete pouring, which has a long construction period. Furthermore, due to space constraints, the concrete cannot be fully vibrated, making it difficult to guarantee the quality of underground concrete construction and posing certain safety hazards.
[0003] Patent CN222513256U proposes a reinforced connection node for edge-inserted steel-concrete composite columns, targeting variable cross-section beam-column nodes in high-rise steel structures. It strengthens the node through components such as diaphragms and corbels, but requires on-site reinforcement binding and concrete pouring, resulting in low construction efficiency. Patent CN120211379A proposes a fully prefabricated steel-joint concrete pipeline support structure and its manufacturing method, using prefabricated components and steel nodes for connection. However, the nodes are of a single flange or weld type, lacking stress concentration resistance design. Patent CN222119947U proposes a cast-in-place prefabricated double-hinged joint steel pipe support structure, employing steel pipe columns, horizontal bracing, and diagonal bracing with double-hinged pin connections. It primarily addresses the installation accuracy issue of bridge supports, but is only used for temporary bridge support. The nodes are ear-plate-pin double-hinged connections, offering high degrees of freedom but unable to withstand continuous deformation of the surrounding rock in tunnels. Utility Model Content
[0004] The purpose of this utility model is to provide a node-reinforced prefabricated steel pipe concrete support structure, which solves the technical problems faced by steel pipe concrete supports in soft rock roadways or tunnels, such as insufficient structural mechanical properties, node stress concentration, and difficulty in ensuring the quality of concrete pouring, through the double mechanical connection of "steel tenon-steel ring plate".
[0005] The technical solution of this utility model is:
[0006] A node-reinforced prefabricated steel-concrete composite support structure includes precast steel-concrete composite segments and steel ring plate connectors. The end faces of adjacent precast steel-concrete composite segments are connected, and the periphery of the joint is rigidly wrapped and connected by steel ring plate connectors. The precast steel-concrete composite segments are divided into a top arc segment, two side wall segments and a bottom arch segment, which are spliced at different positions. The two ends of the top arc segment are respectively connected to one end of the two side wall segments by steel ring plate connectors, and the other ends of the two side wall segments are respectively connected to the two ends of the bottom arch segment by steel ring plate connectors.
[0007] The aforementioned node-reinforced prefabricated steel-concrete composite support structure includes a steel pipe, a steel tenon, a slot, and concrete in each prefabricated steel-concrete composite segment. The steel pipe is filled with concrete, and a steel tenon is embedded in the concrete at one end of the steel pipe. A slot is provided in the concrete at the other end of the steel pipe, with one end of the steel tenon located in the concrete and the other end of the steel tenon protruding.
[0008] In the aforementioned node-reinforced prefabricated steel-concrete pipe support structure, when the end faces of two adjacent prefabricated steel-concrete pipe segments are connected, the protruding end of the steel tenon of one prefabricated steel-concrete pipe segment corresponds to and matches the slot of the other prefabricated steel-concrete pipe segment, so that the two adjacent prefabricated steel-concrete pipe segments are connected by inserting the steel tenon and the slot.
[0009] The aforementioned node-reinforced prefabricated steel-concrete composite support structure, after splicing the top arc segment, two side wall segments, and bottom arch segment, has a straight-wall semi-circular arch, a circle, or a horseshoe shape.
[0010] The node-reinforced prefabricated steel pipe concrete support structure has steel ring plate connectors with symmetrical upper and lower circumferential steel plates. The cross-section of each circumferential steel plate is semi-circular, and flanges are provided on both sides of the end face of each circumferential steel plate. Bolt holes are evenly distributed on the flanges.
[0011] In the aforementioned node-reinforced prefabricated steel pipe concrete support structure, when the end faces of two adjacent prefabricated steel pipe concrete segments are joined, the two circumferential steel plates of the steel ring plate connector wrap around the periphery of the joint, and high-strength bolts are inserted into the corresponding bolt holes. The two circumferential steel plates are fastened to the joint by high-strength bolts.
[0012] The node-reinforced prefabricated steel-concrete composite support structure has circumferential steel plates that are straight, curved, or polygonal.
[0013] The advantages and beneficial effects of this utility model are:
[0014] 1. This utility model provides a node-reinforced prefabricated steel pipe concrete support structure. The structure consists of multiple prefabricated steel pipe concrete segments, including a top arc segment, two side wall segments, and a bottom arch segment. The steel pipe concrete segments are fabricated at the prefabrication plant and transported to the construction site for assembly. The splicing nodes adopt a steel tenon + steel ring plate connection form to fully ensure the strength of the connection nodes and avoid structural system failure caused by stress concentration in local high stress areas of the support. This improves construction efficiency while ensuring the load-bearing capacity of the support structure system.
[0015] 2. The precast steel pipe concrete segment of this utility model has concrete poured in the factory, with sufficient vibration and controllable quality. On-site assembly is all that is needed, which greatly shortens the construction cycle, reduces underground wet work, and improves construction quality and efficiency.
[0016] 3. The steel tenon and slot of this utility model, together with the circumferential constraint of the steel ring plate, form a double-strengthened node with mechanical interlocking and rigid wrapping, which effectively disperses stress, avoids node failure caused by stress concentration, and enhances the strength and stability of the node.
[0017] 4. This utility model adopts multiple cross-sectional designs and adjustable steel ring plate shapes in its overall structure, which can adapt to different roadway cross-sectional requirements and has a wider range of applications. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the node-reinforced prefabricated steel pipe concrete support structure of this utility model.
[0019] Figure 2 for Figure 1 Schematic diagram of section AA.
[0020] Figures 3-6 This is a schematic diagram of a steel ring plate connector. Among them, Figure 3 This is a cross-sectional view. Figure 4 for Figure 3 The BB section view (linear) in the middle. Figure 5 for Figure 3 The BB section view (arc shape) in the middle, Figure 6 for Figure 3 BB section view (polyline).
[0021] Figures 7-9 This is a schematic diagram of the cross-sectional shape of the entire assembled component of this utility model. Figure 7 It is a straight-walled semi-circular arch. Figure 8 It is circular. Figure 9 It is horseshoe-shaped.
[0022] Figures 10-11 This is a schematic diagram of the two end faces of each precast steel-concrete composite segment. Figure 10 For one end face, Figure 11 This is the other end face.
[0023] The attached figures are labeled as follows: 1. Precast steel pipe concrete segment; 11. Steel pipe; 12. Steel tenon; 13. Slot; 14. Concrete; 15. Top arc segment; 16. Side wall segment; 17. Bottom arch segment; 18. Arc-shaped part; 19. Straight wall part; 2. Steel ring plate connector; 21. Circumferential steel plate; 22. Flange; 23. Bolt hole; 24. High-strength bolt. Detailed Implementation
[0024] like Figures 1-11 As shown, this utility model proposes a node-reinforced prefabricated steel-concrete composite support structure, mainly comprising prefabricated steel-concrete composite segments 1 and steel ring plate connectors 2. Adjacent prefabricated steel-concrete composite segments 1 are joined end-to-end, and the periphery of the joint is rigidly wrapped and connected by the steel ring plate connectors 2. Each prefabricated steel-concrete composite segment 1 is divided into a top arc segment 15, two side wall segments 16, and a bottom arch segment 17, which are spliced at different positions. The two ends of the top arc segment 15 are respectively connected to one end of each of the two side wall segments 16 via the steel ring plate connectors 2, and the other ends of each of the two side wall segments 16 are respectively connected to both ends of the bottom arch segment 17 via the steel ring plate connectors 2.
[0025] like Figure 1 , Figures 10-11 As shown, each precast steel-concrete segment 1 includes a steel pipe 11, a steel tenon 12, a slot 13, and concrete 14. The steel pipe 11 is filled with concrete 14. A steel tenon 12 is embedded in the concrete 14 at one end of the steel pipe 11, and a slot 13 is provided in the concrete 14 at the other end of the steel pipe 11. One end of the steel tenon 12 is located in the concrete 14, and the other end protrudes. When two adjacent precast steel-concrete segments 1 are joined end-to-end, the protruding end of the steel tenon 12 of one precast steel-concrete segment 1 corresponds to and matches the shape and size of the slot 13 of the other precast steel-concrete segment 1, allowing the two adjacent precast steel-concrete segments 1 to be connected by the steel tenon 12 and the slot 13.
[0026] like Figures 3-6 As shown, the steel ring plate connector 2 has symmetrical circumferential steel plates 21, each with a semi-circular cross-section. Each circumferential steel plate 21 has flanges 22 on both sides of its end face, with bolt holes 23 evenly distributed on the flanges 22. When two adjacent precast steel pipe concrete segments 1 are joined end-to-end, the two circumferential steel plates 21 of the steel ring plate connector 2 wrap around the joint, and high-strength bolts 24 are inserted through the corresponding bolt holes 23. The two circumferential steel plates 21 are then fastened to the joint by the high-strength bolts 24. The performance grade of the high-strength bolts 24 is 8.8 or higher.
[0027] like Figures 7-9As shown, the top arc segment 15 of the precast steel-concrete composite segment 1 is spliced to the two side wall segments 16 via steel ring plate connectors 2, and the two side wall segments 16 of the precast steel-concrete composite segment 1 are spliced to the bottom arch segment 17 via steel ring plate connectors 2. Depending on the shape of the soft rock tunnel or tunnel, the node-reinforced precast steel-concrete composite support structure of this utility model can be designed as a straight-wall semi-circular arch, circular, or horseshoe shape, etc., adapted to the shape of the soft rock tunnel or tunnel, providing stable and reinforced support for the soft rock tunnel or tunnel. The straight-wall semi-circular arch side wall segment 16 is an integral combination of the arc-shaped part 18 and the straight-wall part 19.
[0028] like Figures 1-11 As shown, the manufacturing process of this utility model is as follows:
[0029] (1) Fabrication of precast steel pipe concrete segment 1 with steel tenon 12. According to the design cross-sectional shape of soft rock roadway or tunnel, steel pipes 11 of top arc segment 15, two side wall segments 16 and bottom arch segment 17 are cut respectively. Concrete 14 is poured into the steel pipe 11. One end of the steel pipe 11 is pre-embedded with steel tenon 12. One end of the steel tenon 12 is pre-embedded in the concrete 14. The other end of the steel tenon 12 protrudes. The other end of the steel pipe 11 is reserved with a slot 13 that matches the shape and size of the protruding end of the steel tenon 12, thus forming the precast steel pipe concrete segment 1 with steel tenon 12.
[0030] (2) Fabrication of steel ring plate connector 2. The steel ring plate connector 2 consists of two circumferential steel plates 21 with a semi-circular cross-section. Each circumferential steel plate 21 has flanges 22 on both sides of its end face, and bolt holes 23 are reserved on the flanges 22. At different splicing positions (top arc segment and two side side segments, two side side segments and bottom arch segment), the circumferential steel plates 21 are made into straight lines, arcs, or broken lines as needed.
[0031] like Figures 1-11 As shown, the installation process of this utility model is as follows:
[0032] (1) During construction, the surrounding rock is first reinforced by advanced small pipe grouting, shotcrete and anchor support, and a foam concrete flexible pressure relief layer is set between the steel pipe concrete support and the surrounding rock.
[0033] (2) Install the node-reinforced prefabricated steel pipe concrete support structure: Apply epoxy resin construction adhesive to the surface of the steel tenon 12 and the slot 13, place the bottom arc segment 17 of the prefabricated steel pipe concrete segment 1 in the design position, and connect the two side side segments 16 and the top arc segment 15 in sequence; install the steel ring plate connector 2 at the connection position of the prefabricated steel pipe concrete segment 1, align the bolt holes 23 on the flanges 22 of the two circumferential steel plates 21, insert the high-strength bolts 24 into the reserved bolt holes 23 and tighten them to form a prefabricated steel pipe concrete support structure with steel tenon-steel ring plate connection, and then spray concrete to seal the steel pipe concrete support.
[0034] The results show that this utility model uses factory prefabrication to ensure component quality, solves the problem of stress concentration at nodes through the composite connection of steel tenons and steel ring plates, and adopts a flexible pressure relief layer and a structural design that can adapt to various cross-sections to achieve adaptability to complex environments such as soft rock roadways or tunnels.
Claims
1. A node-stiffened fabricated steel tube concrete braced structure, characterized by, It includes precast steel pipe concrete segments and steel ring plate connectors. The end faces of adjacent precast steel pipe concrete segments are connected, and the periphery of the joint is rigidly wrapped and connected by steel ring plate connectors. The precast steel pipe concrete segments are divided into a top arc segment, two side wall segments and a bottom arch segment, which are spliced at different positions. The two ends of the top arc segment are connected to one end of the two side wall segments by steel ring plate connectors, and the other ends of the two side wall segments are connected to the two ends of the bottom arch segment by steel ring plate connectors.
2. The node-stiffened fabricated steel tube concrete braced structure according to claim 1, wherein Each precast steel-concrete composite segment includes a steel pipe, a steel tenon, a slot, and concrete. The steel pipe is filled with concrete, and a steel tenon is embedded in the concrete at one end of the steel pipe. A slot is provided in the concrete at the other end of the steel pipe, with one end of the steel tenon located in the concrete and the other end of the steel tenon protruding.
3. The node-stiffened fabricated steel tube concrete braced structure according to claim 2, wherein When two adjacent precast steel pipe concrete segments are joined end-to-end, the protruding end of the steel tenon of one precast steel pipe concrete segment corresponds to the slot of the other precast steel pipe concrete segment and the shapes and dimensions match, so that the two adjacent precast steel pipe concrete segments are connected by inserting the steel tenon and the slot.
4. The node-stiffened fabricated steel tube concrete braced structure according to claim 1, wherein The top arch segment, the two side wall segments, and the bottom arch segment, when spliced together, form a straight-wall semi-circular arch, a circle, or a horseshoe shape.
5. The node-stiffened fabricated steel tube concrete braced structure according to any one of claims 1 to 4, characterized in that, The steel ring plate connector has symmetrical upper and lower circumferential steel plates. The cross-section of each circumferential steel plate is semi-circular. Flanges are provided on both sides of the end face of each circumferential steel plate, and bolt holes are evenly distributed on the flanges.
6. The node-stiffened fabricated steel tube concrete braced structure according to claim 5, wherein When the end faces of two adjacent precast steel pipe concrete segments are joined, the two circumferential steel plates of the steel ring plate connector wrap around the outside of the joint, and high-strength bolts are inserted into the corresponding bolt holes. The two circumferential steel plates are fastened to the joint by high-strength bolts.
7. The node-stiffened fabricated steel tube concrete braced structure according to claim 5, wherein The circumferential steel plate can be straight, curved, or zigzag.