Enhanced steel pipe grating concrete supporting structure

Abstract

The utility model discloses a reinforced steel pipe grating concrete supporting structure which comprises a plurality of steel pipe grating arch frames, each steel pipe grating arch frame is formed by splicing a plurality of grating arch frame sections through connectors, and each grating arch frame section comprises a set of outer side main limb steel pipes and a set of inner side main limb steel pipes. Web plates are connected between the outer side main limb steel pipes and the inner side main limb steel pipes which are positioned on the same plane; a forepoling is mounted on a web plate on the grating arch frame section positioned at the arch part; reinforcing meshes are laid on the outer circumferential face and the inner circumferential face of the steel pipe grating arch frame. According to the supporting structure, a bearing system formed by combining the steel pipe grating lagging jacks, the longitudinal connecting pieces, the reinforcing meshes and the concrete spraying layers is adopted, the integrity of the primary supporting structure is enhanced, the bearing capacity of the primary supporting structure is improved, the flexural rigidity and the torsional rigidity are obviously improved, and the service life of the primary supporting structure is prolonged. The structure can effectively deal with the problems of large surrounding rock load and difficult deformation control of the complex deep soft rock tunnel.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel and underground engineering support, and specifically relates to a reinforced steel tube grid concrete support structure suitable for soft rock tunnels. Background Art

[0002] As the construction of transportation infrastructure in southwest my country enters a new stage of development, more and more tunnel projects are crossing complex geological environments such as deep buried high-stress soft rocks. The support safety issues faced during construction are becoming more prominent, which puts higher requirements on the bearing performance of the initial support structure of the tunnel. At present, the main support forms used in the project are still steel grids, I-beams, H-shaped steel arch frames, etc., but engineering disasters such as arch frame distortion and crushing, support intrusion, and severe cracking of the lining often occur, which also reflects the problems of insufficient bearing capacity, poor coupling effect, and poor stability of the initial support structures such as steel grids, I-beams, and H-shaped steel concrete.

[0003] Traditional grid arches use threaded steel bars as the main load-bearing members, and π-shaped bars, zigzag bars, 8-shaped bars or U-shaped bars as frame members. The grid arches themselves do not have high bearing capacity and rigidity. They can only exert high bearing performance after forming a stable combined structure with shotcrete, which makes it difficult to effectively control the early deformation of the tunnel surrounding rock. In addition, I-beam and H-beam arches have high bearing capacity and good deformation resistance when bent, but their torsional rigidity is low, and the coupling effect with shotcrete is poor, which is not conducive to the deformation control of the surrounding rock of deep soft rock tunnels.

[0004] In summary, the existing general support methods may not be applicable to soft rock tunnel projects under some complex geological conditions, and it is difficult to effectively control the large deformation of the tunnel. Therefore, a new arch frame structure with higher bearing capacity and better stability can be designed based on the existing arch frame structure, and the purpose of improving the stress of the support structure system and controlling the deformation of the tunnel surrounding rock can be achieved by strengthening the initial support structure. Utility Model Content

[0005] The purpose of the utility model is to provide a reinforced steel tube grid concrete support structure suitable for soft rock tunnels to meet the deformation stability control of deep soft rock tunnels, solve the problem of support system failure caused by excessive deformation of surrounding rock, and reduce construction costs.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is:

[0007] A reinforced steel tube grid concrete support structure, comprising a plurality of steel tube grid arch frames, wherein the steel tube grid arch frames are assembled from a plurality of grid arch frame segments through joints, wherein the grid arch frame segments include a group of outer main limb steel pipes and a group of inner main limb steel pipes, and a web is connected between the outer main limb steel pipes and the inner main limb steel pipes located on the same plane; an advance support is installed on the web of the grid arch frame segment located at the arch;

[0008] The outer circumference and inner circumference of the steel tube grid arch are both paved with steel mesh.

[0009] According to a further solution, the steel meshes located on the outer and inner circumferences of the steel tube grille arch are fixedly connected to the steel tube grille arch by U-shaped buckles.

[0010] In a further solution, the U-shaped buckle includes a U-shaped body, and both ends of the U-shaped body are fixedly provided with U-shaped grooves.

[0011] In a further solution, reinforcing ribs are connected between the outer main limb steel pipe and the inner main limb steel pipe; adjacent steel pipe grid arch frames are connected by longitudinal connecting pieces.

[0012] According to a further solution, the longitudinal connecting member includes upper and lower clamping plates which are arranged relatively to each other, the upper clamping plate includes a connecting rod, both ends of the connecting rod are respectively fixed with semi-circular ring clamping plates, the ends of the semi-circular ring clamping plates are provided with buckles which match the lower clamping plate; the semi-circular ring clamping plates on the upper and lower clamping plates are respectively clamped on the outer main limb steel pipe and the inner main limb steel pipe and clamped relatively to each other, and the connecting rod is fixedly connected by tightening bolts.

[0013] In a further solution, a support installation hole for installing an advance support is opened on the web, and the advance support is an advance pipe rack or an advance small guide tube.

[0014] In a further solution, the joint includes a connecting plate vertically fixed to the end of the grid arch segment, and adjacent grid arch segments are connected via the connecting plate and fixed with joint bolts.

[0015] In summary, the support structure provided by the utility model adopts a load-bearing system composed of a steel pipe grid arch frame + longitudinal connectors + steel mesh + concrete spray layer, which enhances the integrity of the initial support structure, improves its bearing capacity, and significantly improves the bending stiffness and torsional stiffness. This structure can effectively cope with the problems of large surrounding rock loads and difficult deformation control in complex deep soft rock tunnels.

[0016] The steel tube grid concrete support structure provided by the utility model adopts small-diameter seamless steel tubes or seamed steel tubes as the main load-bearing members, and welds webs between the inner and outer main limb steel tubes, which solves the problems of insufficient bearing capacity and low torsional rigidity of traditional arch frames, while also retaining the good coupling bearing effect of the grid structure and concrete, strengthening the bonding strength between the reinforced steel tube grid arch frame and the concrete, so that the support structures can bear and deform together, and maximize their respective performance characteristics, avoiding the problems of poor coupling effect and poor stability caused by using I-beams and H-beams as the initial support arch frames, and can provide important safety guarantees for the deformation stability control of deep soft rock tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0018] Figure 1 This is an overall schematic diagram of the utility model enhanced steel tube grid concrete support structure;

[0019] Figure 2 It is a structural schematic diagram of the steel tube grid arch frame in the utility model;

[0020] Figure 3 yes Figure 2 A magnified schematic diagram of the middle part;

[0021] Figure 4 This is a schematic diagram of the distribution of the web plate of the utility model on the steel tube grid arch frame Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the distribution of the web plate of the utility model on the steel tube grid arch frame Figure 2 ;

[0023] Figure 6 It is a schematic diagram of the distribution of the middle web of the utility model on three steel tube grid arch frames;

[0024] Figure 7 It is a schematic diagram of the installation of the super front pipe shed in the utility model;

[0025] Figure 8 It is a schematic diagram of the arrangement of the steel mesh in the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the steel mesh in the utility model;

[0027] Fig.10 It is a structural schematic diagram of the U-shaped buckle of the utility model;

[0028] Fig.11It is a schematic diagram of the arrangement of the longitudinal connecting member in the utility model;

[0029] Fig.12 It is a structural schematic diagram of the longitudinal connecting piece of the utility model.

[0030] The symbols in the figure are:

[0031] 1-steel tube grating arch; 2-grating arch segment; 3-joint; 4-longitudinal connector; 5-web; 6-advanced pipe shed; 7-steel mesh; 8-concrete spraying layer; 9-outer main limb steel pipe; 10-inner main limb steel pipe; 11-reinforcement rib; 12-joint bolt; 13-connecting plate; 14-support mounting hole; 15-U-shaped buckle, 151-U-shaped main body, 152-U-shaped slot; 161-connecting rod, 162-semicircular ring clamp; 17-fastening bolt. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the present application, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0034] See also Figure 1-12 A reinforced steel tube grid concrete support structure comprises a plurality of steel tube grid arch frames 1, wherein the steel tube grid arch frame 1 is assembled from a plurality of grid arch frame segments 2 through joints 3, wherein the grid arch frame segments 2 comprise a group of outer main limb steel pipes 9 and a group of inner main limb steel pipes 10, wherein a web plate 5 is connected between the outer main limb steel pipes 9 and the inner main limb steel pipes 10 located on the same plane; an advance support is installed on the web plate 5 on the grid arch frame segment 2 located on the arch;

[0035] The outer and inner surfaces of the steel tube grid arch 1 are both paved with steel mesh sheets 7 .

[0036] That is, in this embodiment, the steel tube grid arch frame is composed of inner and outer main limb steel tubes as main load-bearing members, webs and reinforcing ribs (such as U-shaped ribs, π-shaped ribs, "Z"-shaped ribs, "8"-shaped ribs) as frame members, which are fixedly connected to each other. The number of main limb steel tubes can be designed to be 4, 6, or 8. In this embodiment, four main limb steel tubes are used as an example for explanation.

[0037] The enhanced steel tube grid concrete support structure provided by the utility model comprises a plurality of steel tube grid arch frames 1 which are sequentially arranged along the longitudinal direction of the tunnel; the steel tube grid arch frames 1 are built inside the concrete spraying layer 8.

[0038] A reinforcing rib 11 is connected between the outer main limb steel pipe 9 and the inner main limb steel pipe 10; the nodes of the grid arch segments are connected by joints. Figure 3 As shown, it includes a connecting plate 13 and a joint bolt 12, wherein the connecting plate 13 is vertically fixed to the end of the grid arch segment 2, and adjacent grid arch segments 2 are connected through the connecting plate 13 and then fixed with the joint bolt 12. A through hole is opened in the middle of the connecting plate 13 to form a "U" shape. When spraying concrete, the middle of the connecting plate 13 will be filled with concrete. This design type improves the overall strength of the connecting plate 3 and the concrete spraying layer 8.

[0039] The inner and outer main limb steel pipes can be made of small-diameter round steel pipes or square steel pipes, and the inner cavity of the steel pipe can be poured with or without concrete. That is, the present application uses small-diameter steel pipes as the main load-bearing parts, and welds webs between the inner and outer main limb steel pipes, which greatly improves the bearing capacity, bending stiffness and torsional stiffness of the steel pipe grid arch frame, and also has a good coupling bearing effect with shotcrete, maximizes the performance characteristics of the steel pipe grid arch frame and shotcrete, enables the support structure to carry and deform together, and solves the problem that the traditional arch frame structure is prone to failure and damage in deep soft rock tunnels.

[0040] In addition, the main limb steel pipe can be seamless steel pipe or seamed steel pipe, and threads can be added on the surface of the steel pipe. The material performance characteristics of seamless steel pipe or seamed steel pipe are used to increase the toughness of the structure and enhance the ductility of the support system; the web is welded between the outer main limb steel pipe 9 and the inner main limb steel pipe 10 to improve the integrity and stability of the structure and enhance the bearing capacity of the support system.

[0041] The web is processed into a whole sector plate, and a support installation hole of suitable size can be drilled on the sector plate to facilitate the installation of the advanced pipe rack and the advanced small pipe. The length and thickness of the web can be set according to the bearing capacity requirements.

[0042] like Figure 8 , 9 As shown, in order to further reduce the rebound rate of the concrete spraying layer 8 and improve the bearing performance of the initial support structure, the steel mesh 7 located on the outer and inner surfaces of the steel tube grid arch frame 1 are fixedly connected to the steel tube grid arch frame 1 through U-shaped buckles 15. The structure of the U-shaped buckle 15 is as shown in FIG. Fig.10As shown, it includes a U-shaped main body 151, and both ends of the U-shaped main body 151 are fixed with U-shaped grooves 152. That is, the steel mesh 7 is laid on the outer and inner surfaces of the steel tube grid arch 1. When fixing the outer surface steel mesh 7, the U-shaped buckle 15 is first inserted from one side, and its U-shaped main body 151 is just stuck on an outer main limb steel pipe 9 on the steel tube grid arch 1. The two U-shaped grooves 152 extend out and are clamped on the steel mesh 7, that is, the steel mesh 7 on the outer surface is fixed; similarly, the inner main limb steel pipe 10 is connected to the steel mesh 7 on the inner surface through the U-shaped buckle 15 to achieve the fixation of the steel mesh 7 on the inner surface. It is easy to operate and can be operated on site by hand. The steel mesh 7 is installed by on-site assembly, which can greatly reduce on-site welding work, improve the construction environment, and speed up the construction progress.

[0043] In addition, the arrangement of the inner and outer double-layer steel mesh 7 can better restrain the concrete spray layer 8, improve the bonding effect between the steel tube grid arch 1 and the concrete spray layer 8, and enhance the supporting strength of the overall structure.

[0044] In a further embodiment, the adjacent steel tube grid arch frames 1 are connected by longitudinal connectors 4, and the longitudinal connectors 4 are arranged at a certain distance along the tunnel annular direction. Fig.11 , 12 As shown, the longitudinal connector 4 includes upper and lower clamping plates arranged relatively, the upper clamping plate includes a connecting rod 161, and the two ends of the connecting rod 161 are respectively fixed with semi-circular clamping plates 162, and the ends of the semi-circular clamping plates 162 are provided with buckles matching the lower clamping plate; the structure of the lower clamping plate is the same as that of the upper clamping plate, and the only difference is that the ends of the semi-circular clamping plates are different, and they are tooth-like structures that bite each other. The semi-circular clamping plates 162 on the upper and lower clamping plates are respectively clamped on the outer main limb steel pipe 9 and the inner main limb steel pipe 10 and are relatively clamped, and the connecting rod 161 is fixedly connected by tightening bolts 17. This mechanical connection method is simple and easy, and the construction efficiency is significantly improved.

[0045] like Figure 4-6 As shown, a web 5 is connected between the outer main limb steel pipe 9 and the inner main limb steel pipe 10 located on the same plane, and a support installation hole 14 for installing an advance support is opened on the web 5 located partially at the arch portion. The advance support is an advance pipe rack 6 or an advance small guide tube. Figure 4 The middle web 5 is welded between the inner and outer main limb steel pipes at intervals; Figure 5 A support installation hole 14 for installing an advance support is provided on the web 5 located in the arch portion; Figure 6 The figure shows the distribution of the webs 5 in three steel tube grid arch frames, wherein a support installation hole 14 is provided on the web 5 of the arch portion of one of the steel tube grid arch frames.

[0046] The length and thickness of the web 5 can be dynamically adjusted according to the engineering geological conditions. When the surrounding rock pressure is large, the length and thickness of the web 5 can be increased; when the surrounding rock pressure is small, the length and thickness of the web 5 can be reduced. Specifically, when designing the steel tube grid arch 1, the spacing between adjacent webs 5 in the annular direction can be optimized according to actual needs. By changing the spacing, the bearing capacity of the support structure can be enhanced or weakened.

[0047] like Figure 7 As shown, the enhanced steel tube grid concrete support structure provided by the utility model also includes an advanced pipe shed 6, which is arranged within a certain range of the tunnel arch, passes through the support installation hole 14 on the web 5, and the advanced pipe shed 6 is welded to the steel tube grid arch frame 1 into a whole, forming a stable support for the tunnel excavation surface.

[0048] In this embodiment, the steel tube grid arch frame is divided into several sections based on factors such as the tunnel profile and the weight of the arch frame. The sections are recorded as type A (A1, A2, A3), type B (B1, B2) and type C; the structures of the A1, A2 and A3 sections are exactly the same, wherein the A1 and A3 sections are respectively located at the left and right shoulders of the arch frame, and the A2 section is located at the top of the arch frame; the structures of the B1 and B2 sections are exactly the same, and are respectively located at the left and right waists of the arch frame; the C section is located at the bottom of the arch frame.

[0049] Therefore, the support structure of the utility model adopts a load-bearing system composed of a steel pipe grid arch frame + longitudinal connectors + steel mesh + concrete spray layer, which enhances the integrity of the initial support structure, improves its bearing capacity, and significantly improves the bending stiffness and torsional stiffness. This structure can effectively cope with the problems of large surrounding rock loads and difficult deformation control in complex deep soft rock tunnels.

[0050] Taking the two-step method construction as an example, the support process of the above-mentioned enhanced steel tube grid concrete support structure is explained, which includes the following steps:

[0051] S1. Calculate the required bearing capacity of the steel tube grid arch frame according to the surrounding rock pressure, select the length and thickness of the web plate, and then weld the processed web plate between the inner and outer main limb steel pipes on the grid arch frame segment 2;

[0052] S2. After excavating the upper steps, the surveyors will stake out the arch positions, check the cross-sectional dimensions, and mark the arch positions and elevations on the base surface;

[0053] S3, assembling A-type grid arch segments, which are three A1, A2, and A3 segments with the same structure, wherein the A1 and A3 segments are located at the left and right shoulders of the arch respectively, and the A2 segment is located at the top of the arch; then placing the A1, A2, and A3 segments in a predetermined position in sequence and connecting the joints 3 on the adjacent segments;

[0054] The specific process is as follows:

[0055] First, assemble the A1 segment, place the A1 segment at the preset position, remove the floating ballast at the bottom of the arch frame, and use concrete pads to support it; after the arch frame positioning is qualified, use the longitudinal connector 4 to connect the upper steel pipe grid arch frame into a whole, and then lay the inner and outer steel mesh 7;

[0056] Then, assemble the A2 segment, also place the A2 segment at the preset position, adjust the arch frame posture, assemble the A1 segment and the A2 segment together through the connecting plate 3, use the longitudinal connector 4 to connect the A2 segment with the previous steel tube grid arch frame into a whole, and then lay the inner and outer steel mesh 7;

[0057] Finally, assemble the A3 segment, also place the A3 segment at the preset position, remove the floating ballast at the bottom of the arch frame, use concrete pads to support it, adjust the arch frame posture, assemble the A3 segment and the A2 segment together through the connecting plate 3, use the longitudinal connector 4 to connect the A3 segment with the previous steel tube grid arch frame into a whole, and finally lay the inner and outer steel mesh 7;

[0058] S4. Install locking anchor pipes at the arch feet on both sides of the steps, install advance support on the arch, and then spray concrete to seal the surrounding rock and wrap the A-type grid arch frame segment;

[0059] Two locking foot anchor pipes are set at each arch foot, which are symmetrically installed at 50 cm on both sides of the arch foot. The length of the locking foot anchor pipes is designed according to the surrounding rock conditions. In order to ensure the overall rigidity of the steel frame, the locking foot anchor pipes are fixed to the arch frame by mechanical connection. The angle and direction of the locking foot anchor pipes are determined in combination with the inclination and trend of the rock formation, the development direction of the joints, etc.; the advanced pipe shed 6 is installed in a certain range of the arch as required. Since the web 5 has reserved support installation holes 14, the installation of the advanced pipe shed 6 can be facilitated; after the processes of the upper step steel pipe grid arch frame 1, the steel mesh 7, the longitudinal connector 4, the advanced pipe shed 6, etc. are completed, concrete is sprayed in time to seal the surrounding rock and wrap the arch frame.

[0060] S5. After excavating the lower step, the surveyor will lay out the arch frame position, place the assembled B-type grid arch frame segment at the preset position, and connect the joints 3 of the adjacent segments; the B-type grid arch frame segment is two B1 and B2 segments with the same structure, which are located at the left and right waist of the arch frame respectively;

[0061] That is, the A1 segment and the B1 segment are assembled together, and the A3 segment and the B2 segment are assembled together; after the arch frame positioning is verified to be qualified, the two adjacent steel frames are connected into a whole by using the longitudinal connector 4, and then the inner and outer steel meshes 7 are laid;

[0062] S6. Assemble C-type grid arch segments, place the C-type grid arch segments at the preset arch bottom position, assemble one end of the C segment with the B1 segment through the joint 3, and assemble the other end of the C segment with the B2 segment, and form a closed arch bearing ring after connection; after the arch positioning is verified to be qualified, use the longitudinal connector 4 to connect the two adjacent steel frames into a whole, and lay the inner and outer steel meshes 7, and spray concrete in time to seal the surrounding rock and wrap the steel pipe grid arch.

[0063] The supporting structure provided by the utility model adopts a large number of assembled connection methods on site, which can not only ensure the construction quality, but also speed up the construction progress to a great extent and improve the working environment.

[0064] In addition, the utility model can also dynamically adjust the model of the main limb steel pipe, the size and arrangement spacing of the web, the arrangement spacing of the steel pipe grid arch frame and the longitudinal connectors, the reinforcement of the steel mesh, and the grade of shotcrete according to the geological conditions of the tunnel surrounding rock.

[0065] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are within the scope of protection of the pending claims of the present application.

[0067] In the description of the present invention, terms such as "longitudinal", "circumferential", "radial", "parallel", "left", "right", "upper", "lower", "inner", and "outer" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0068] In addition, the terms "installation", "setting", "connection" and "fixed connection" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A reinforced steel tube grid concrete support structure, comprising a plurality of steel tube grid arch frames (1), wherein the steel tube grid arch frames (1) are assembled from a plurality of grid arch frame segments (2) through joints (3), characterized in that: The grid arch segment (2) comprises a group of outer main limb steel pipes (9) and a group of inner main limb steel pipes (10), and a web (5) is connected between the outer main limb steel pipes (9) and the inner main limb steel pipes (10) located on the same plane; an advance support is installed on the web (5) on the grid arch segment (2) located on the arch; The outer circumferential surface and the inner circumferential surface of the steel tube grid arch frame (1) are both paved with steel mesh sheets (7).

2. The reinforced steel tube grid concrete support structure according to claim 1 is characterized in that: The steel mesh sheets (7) located on the outer circumference and inner circumference of the steel tube grid arch frame (1) are fixedly connected to the steel tube grid arch frame (1) via U-shaped buckles (15).

3. The reinforced steel tube grid concrete support structure according to claim 2 is characterized in that: The U-shaped buckle (15) comprises a U-shaped main body (151), and both ends of the U-shaped main body (151) are fixedly provided with U-shaped clamping grooves (152).

4. The reinforced steel tube grid concrete support structure according to claim 1, characterized in that: A reinforcing rib (11) is connected between the outer main limb steel pipe (9) and the inner main limb steel pipe (10); and adjacent steel pipe grid arch frames (1) are connected via a longitudinal connecting piece (4).

5. The reinforced steel tube grid concrete support structure according to claim 4 is characterized in that: The longitudinal connecting member (4) comprises upper and lower clamping plates which are arranged opposite to each other, the upper clamping plate comprises a connecting rod (161), and semi-circular clamping plates (162) are respectively fixed at both ends of the connecting rod (161), and the ends of the semi-circular clamping plates (162) are provided with buckles which match the lower clamping plate; the semi-circular clamping plates (162) on the upper and lower clamping plates are respectively clamped on the outer main limb steel pipe (9) and the inner main limb steel pipe (10) and are relatively clamped, and the connecting rod (161) is fixedly connected by tightening bolts (17).

6. The reinforced steel tube grid concrete support structure according to claim 1, characterized in that: The web (5) is provided with a support installation hole (14) for installing an advance support, and the advance support is an advance pipe rack (6) or an advance small pipe.

7. The reinforced steel tube grid concrete support structure according to claim 1, characterized in that: The joint (3) comprises a connecting plate (13) vertically fixed to the end of the grid arch segment (2); adjacent grid arch segments (2) are butt-jointed via the connecting plate (13) and then fixed with joint bolts (12).

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