A pressure-yielding support structure

Abstract

The present invention provides a pressure-yielding support structure. It includes a plurality of arch frame units and a plurality of pressure-yielding assemblies; adjacent arch frame units are connected by pressure-yielding assemblies; the pressure-yielding assembly includes a pressure-yielding tube, and at least two grooved areas with different recessed depths are provided on the outer wall of the pressure-yielding tube along the axial direction of the pressure-yielding tube. The present invention provides at least two grooved areas with different recessed depths on the outer wall of the pressure-yielding tube along the axial direction of the pressure-yielding tube, and reduces the cross-sectional area of ​​the grooved area of ​​the pressure-yielding tube through the grooves, resulting in a decrease in the axial compressive stiffness of the grooved area of ​​the pressure-yielding tube, thereby inducing the pressure-yielding tube to generate axial compression deformation in the grooved area when it is subjected to surrounding rock pressure, thereby achieving an active pressure-yielding effect; and the deeper the cutting depth of the grooves, the lower the compressive stiffness of the overall structure. By providing at least two grooved areas with different recessed depths on the outer wall of the pressure-yielding tube, the effect of staged resistance change can be achieved according to the change of surrounding rock pressure borne by the pressure-yielding support structure.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a yielding support structure. Background Art

[0002] Affected by complex geological conditions and tectonic stress, large deformation problems of soft rock with characteristics of fast deformation rate, large deformation magnitude and long convergence duration are very likely to occur during tunnel construction. In response to the large deformation problem of tunnels, the support technologies used at home and abroad can be divided into three categories: strong support, layered support and yield support. Among them, the yield support technology is to appropriately release the deformation energy in the tunnel surrounding rock by setting a yield structure between the lining and the tunnel surrounding rock or in the support structure, so as to achieve the effect of optimizing the force of the support structure.

[0003] At present, there have been many achievements in the research on yielding support at home and abroad. Many scholars have developed structures such as retractable steel frames and flexible joints. However, due to the construction differences and variability of surrounding rock properties during tunnel surrounding rock support, the existing yielding support structures often have unstable performance in actual applications. The main manifestations are: (1) The deformation in the constant resistance yielding stage is too small, such as Figure 8 Compared with curve ③ (theoretical value), the yielding deformation B0B1 section of curve ② is smaller than the theoretical B0B3 section, resulting in insufficient release of the deformation energy of the tunnel surrounding rock; (2) the deformation amount in the constant resistance yielding stage is too large, such as Figure 8 Compared with curve ③ (theoretical value), the yielding deformation B0B5 section of curve ④ is larger than the theoretical B0B3 section, which causes the support structure to deform too much and fail as a whole. In addition, the "constant resistance" design of the existing yielding support structure fails to fit the three stages of tunnel surrounding rock deformation, which also limits the full play of support performance to a certain extent. Figure 8 As shown in the figure, curve ① represents the mechanical characteristic curve of the surrounding rock: (1) Linear elastic stage. In this stage, the deformation of the tunnel surrounding rock is large, but the surrounding rock pressure will decrease rapidly with the increase of deformation. Therefore, the support structure is required to have high compressibility, so as to obtain a significant reduction in the surrounding rock pressure with sufficient deformation; (2) Plastic stage. In this stage, the deformation rate of the surrounding rock is accelerated and the surrounding rock pressure does not decrease significantly. Therefore, the support structure is required to have a certain variable resistance, so as to gradually balance the surrounding rock pressure through the continuous enhancement of support resistance and finally reach stability; (3) Loosening and failure stage. In this stage, the surrounding rock pressure no longer decreases with the increase of deformation, but the stress increases inversely. Therefore, the support structure is required to have a limited amount of compression, that is, to ensure that the compression process is completed in the plastic stage, so as to avoid the surrounding rock after support entering the loosening and failure stage.

[0004] In view of the above characteristics, the constant resistance and yielding property of the existing yielding support structure cannot well match the staged deformation law of the surrounding rock, resulting in the yielding support performance not being fully utilized.

[0005] In summary, there is an urgent need for a compression support structure to solve the problems existing in the prior art. Summary of the invention

[0006] The present invention aims to provide a pressure-yielding support structure to solve the problem of pressure-yielding support structure changing resistance and giving up pressure in stages.

[0007] To achieve the above-mentioned purpose, the present invention provides a pressure-releasing support structure, comprising a plurality of arch frame units and a plurality of pressure-releasing assemblies; adjacent arch frame units are connected by pressure-releasing assemblies; the pressure-releasing assemblies include a pressure-releasing tube, and at least two grooved areas with different recessed depths are provided on the outer wall of the pressure-releasing tube along the axial direction of the pressure-releasing tube.

[0008] Preferably, a deep concave pattern area, a medium concave pattern area and a shallow concave pattern area are provided on the outer wall of the yield tube; the depression depth of the deep concave pattern area is 60% to 80% of the wall thickness of the yield tube, the depression depth of the medium concave pattern area is 40% to 60% of the wall thickness of the yield tube, and the depression depth of the shallow concave pattern area is 20% to 40% of the wall thickness of the yield tube.

[0009] Preferably, the deep groove area, the middle groove area and the shallow groove area are symmetrically arranged with respect to the center of the length direction of the pressure relief tube, and the distance between adjacent groove areas is 6 mm to 8 mm.

[0010] Preferably, the deep groove area, the medium groove area and the shallow groove area are each provided with a plurality of annular grooves; and the spacing between adjacent annular grooves in each groove area is 2 mm to 4 mm.

[0011] Preferably, the width of the annular groove is 2 mm to 4 mm.

[0012] Preferably, the pressure-releasing assembly further comprises a connecting plate 1 provided at both ends of the pressure-releasing pipe, and the connecting plate 1 is connected to adjacent arch frame units.

[0013] Preferably, a second connecting plate is provided at the end of the arch frame unit connected to the pressure-releasing assembly, and connecting holes are provided on both the second connecting plate and the first connecting plate.

[0014] Preferably, both sides of the connecting plate 1 are provided with limiting pieces; and both sides of the pressure-releasing assembly are provided with rigidity limiting plates for cooperating with the limiting pieces on the same side.

[0015] Preferably, a slide groove is provided on the rigidity limiting plate to enable the limiting member to slide in the slide groove; and the length direction of the slide groove is parallel to the axial direction of the pressure relief tube.

[0016] Preferably, the limiting member is a bolt assembly.

[0017] The application of the technical solution of the present invention has the following beneficial effects:

[0018] (1) In the present invention, at least two grooved areas with different depression depths are provided on the outer wall of the yield pipe along the axial direction of the yield pipe, and the grooves reduce the cross-sectional area of ​​the grooved area of ​​the yield pipe, resulting in a decrease in the axial compressive stiffness of the grooved area (i.e., the cutting area) of the yield pipe, thereby inducing the yield pipe to generate axial compression deformation in the grooved area when it is subjected to surrounding rock pressure, thereby achieving an active yield effect; and the deeper the cutting depth of the grooves, the lower the compressive stiffness of the overall structure. By providing at least two grooved areas with different depression depths on the outer wall of the yield pipe, the effect of staged resistance change can be achieved according to the change of surrounding rock pressure borne by the yield support structure.

[0019] (2) In the present invention, by setting deep grooves, medium grooves and shallow grooves on the pressure-yielding pipe, the compression deformation of the deep grooves is first exchanged for a significant reduction in the surrounding rock pressure, thereby releasing the high deformation energy in the tunnel surrounding rock to the maximum extent; then the compression deformation of the pressure-yielding support structure is limited by the medium grooves, thereby gradually balancing the surrounding rock pressure through the continuously enhanced support resistance and reaching a stable state; finally, since the shallow grooves have a high axial compressive stiffness, the pressure-yielding deformation of the pressure-yielding pipe is completed in the plastic deformation stage of the surrounding rock through high-strength support, thereby preventing the surrounding rock after support from entering the loosening and damage stage. Such a pressure-yielding support structure is applied to the large deformation tunnel support structure, which can achieve the effect of staged adaptive variable resistance.

[0020] (3) In the present invention, the deep groove area, the middle groove area and the shallow groove area are symmetrically arranged about the center of the length direction of the pressure-releasing tube. When the pressure-releasing tube is subjected to the surrounding rock pressure, the compression deformation at both ends of the pressure-releasing tube along its axis is kept as consistent as possible.

[0021] (4) In the present invention, by arranging stiffness limiting plates on both sides of the pressure-yielding assembly, the lateral stiffness of the adaptive variable resistance pressure-yielding support structure can be enhanced. While limiting the lateral displacement, the vertical compression deformation of the pressure-yielding assembly during the variable resistance pressure-yielding process (i.e., the axial compression deformation of the pressure-yielding pipe) is not affected, thereby ensuring that the pressure-yielding assembly arranged in the initial support structure of the tunnel has sufficient lateral stiffness.

[0022] (5) In the present invention, the pressure-yielding support structure includes a pressure-yielding assembly and an arch frame unit, wherein the pressure-yielding assembly includes a pressure-yielding pipe, a connecting plate and a stiffness limiting plate. The manufacturing process is simple and the structure can be prefabricated and assembled by welding and bolting. The structure can be easily installed on site during tunnel construction. Therefore, the pressure-yielding support structure has the advantages of controllable cost, convenient manufacturing and simple installation.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of a yield support structure applied to tunnel support in an embodiment of the present application;

[0026] Figure 2 This is an embodiment of the present application Figure 1 A magnified view of part A;

[0027] Figure 3 This is an embodiment of the present application Figure 2 Schematic diagram of the structure of the middle pressure pipe;

[0028] Figure 4 This is an embodiment of the present application Figure 2 A schematic diagram of the structure of the middle connecting plate 1;

[0029] Figure 5 This is an embodiment of the present application Figure 2 The structural diagram of the middle connecting plate 2;

[0030] Figure 6 This is an embodiment of the present application Figure 2 Schematic diagram of the structure of the medium stiffness limiting plate;

[0031] Figure 7 is the compression mechanical characteristic curve of the yield support structure in the embodiment of the present application;

[0032] Figure 8 It is a comparison diagram of mechanical characteristic curves between the existing pressure-yielding support structure and the pressure-yielding support structure of the present application;

[0033] Fig. 9 It is the compression mechanical characteristic curve of the yield pipe with different groove depths;

[0034] Among them, 1. Arch frame unit, 1.1. Connecting plate 2, 1.2. Arch frame section, 2. Pressure relief assembly, 2.1. Pressure relief pipe, 2.1.1. Deep concave groove area, 2.1.2. Medium concave groove area, 2.1.3. Shallow concave groove area, 2.2. Connecting plate 1, 2.2.1. Limiting piece, 2.3. Stiffness limiting plate, 2.3.1. Slide groove. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims. Example

[0036] See also Figures 1 to 9, a pressure-yielding support structure, this embodiment is applied to adaptive variable resistance pressure-yielding support of large deformation tunnels.

[0037] A yielding support structure, see Figure 1 , comprising a plurality of arch frame units 1 and a plurality of pressure-releasing components 2; adjacent arch frame units 1 are connected by the pressure-releasing components 2, and a plurality of arch frame units 1 are connected end to end to form an arc-shaped arch frame matching the cross-sectional profile of the tunnel; see Figure 2 and Figure 3 , the pressure-yielding component 2 includes a pressure-yielding tube 2.1, and at least two groove areas with different depression depths are provided on the outer wall of the pressure-yielding tube 2.1 along the axial direction of the pressure-yielding tube 2.1; and the axial direction of the pressure-yielding tube 2.1 is parallel to the connection direction between the pressure-yielding component 2 and the arch frame unit 1. In this embodiment, the pressure-yielding tube 2.1 is made of a hollow steel tube, and grooves are cut on the outer wall of the hollow steel tube. The grooves reduce the cross-sectional area of ​​the grooved area of ​​the hollow steel tube, resulting in a decrease in the axial compressive stiffness of the grooved area (i.e., the cutting area) of the pressure-yielding tube 2.1, thereby inducing the pressure-yielding tube 2.1 to produce axial compression deformation in the grooved area when it is subjected to the surrounding rock pressure, thereby achieving the effect of active pressure-yielding. The deeper the cutting depth of the groove (i.e., the depression depth of the groove relative to the outer wall of the pressure-yielding tube 2.1), the lower the compressive stiffness of the overall structure. Fig. 9 As shown; by providing at least two concave areas with different depression depths on the outer wall of the pressure-releasing pipe 2.1, the effect of variable resistance in stages can be achieved according to the change of surrounding rock pressure borne by the pressure-releasing support structure.

[0038] In this embodiment, the outer wall of the pressure-releasing tube 2.1 is provided with a deep groove area 2.1.1, a medium groove area 2.1.2 and a shallow groove area 2.1.3; the depression depth of the deep groove area 2.1.1 is 60% to 80% of the wall thickness of the pressure-releasing tube 2.1, the depression depth of the medium groove area 2.1.2 is 40% to 60% of the wall thickness of the pressure-releasing tube 2.1, and the depression depth of the shallow groove area 2.1.3 is 20% to 40% of the wall thickness of the pressure-releasing tube 2.1. In order to ensure the pressure-releasing support effect, the pressure-releasing tube 2.1 is usually made of Q235 hollow steel pipe with a diameter of 100mm to 120mm and a wall thickness of 10mm to 20mm. In this embodiment, the wall thickness of the pressure-releasing tube 2.1 is 10mm, which is made of Fig. 9 It can be seen that when the depression depth of the groove is between 0% and 90% of the wall thickness, it has different compression deformation characteristics. When the depression depth is deeper, its slope shows a trend of gradually decreasing, indicating that the deeper the groove depth cut on the surface of the pressure tube 2.1, the lower the compressive stiffness of the overall structure of the pressure tube 2.1.

[0039] See also Figure 8The characteristic of the yielding support structure is that the yielding support mechanical characteristic curve ⑤ releases the deformation energy of the surrounding rock through the "zero slope" constant resistance DE segment. When its deformation reaches the limit, the stiffness of the support structure begins to gradually increase (EF segment) until it intersects with the surrounding rock mechanical characteristic curve ①, thereby ensuring the stability of the surrounding rock. Therefore, the yielding support structure of this application has the characteristics of "resisting and yielding at the same time", which is suitable for dealing with large deformation problems in tunnels.

[0040] See also Figure 7 and Figure 8 In the initial stage of support structure stress, the pressure support structure is in the variable resistance I stage. When the tunnel surrounding rock is in the linear elastic deformation stage (i.e. Figure 8 In the linear elastic stage, the deformation of the tunnel surrounding rock is large, and the surrounding rock pressure will decrease rapidly as the deformation increases. At this time, the deep groove area 2.1.1 with the smallest cross-sectional area on the pressure pipe 2.1 will first undergo compression deformation due to its small axial compressive stiffness, thereby exchanging sufficient deformation for a significant reduction in surrounding rock pressure and releasing the high deformation energy in the tunnel surrounding rock to the maximum extent. When the deformation of the tunnel surrounding rock continues to develop from linear elastic deformation to plastic deformation stage (i.e. Figure 8 In the plastic stage in the tunnel, the deformation of the surrounding rock increases rapidly and the surrounding rock pressure does not decrease significantly. At this time, the yield support structure is in the variable resistance II stage. The middle concave area 2.1.2 provides greater rigidity for the yield support structure while limiting the compression deformation of the yield support structure, thereby gradually balancing the surrounding rock pressure through the continuously enhanced support resistance and reaching a stable state. In order to prevent the surrounding rock deformation from entering the loosening and failure stage from the plastic deformation stage, the yield support structure is in the variable resistance III stage in the late stage of the plastic deformation stage of the surrounding rock. Since the shallow concave area 2.1.3 has a higher axial compressive stiffness, the yield deformation of the yield pipe 2.1 is completed in the plastic deformation stage of the surrounding rock through high-strength support, thereby preventing the surrounding rock after support from entering the loosening and failure stage. Such a yield support structure is applied to the large deformation tunnel support structure, which can achieve the effect of staged adaptive variable resistance.

[0041] See also Figure 3 The deep groove area 2.1.1, the middle groove area 2.1.2 and the shallow groove area 2.1.3 are symmetrically arranged along the length direction of the pressure-releasing tube 2.1. When the pressure-releasing tube 2.1 is subjected to the surrounding rock pressure, the compression deformation of the pressure-releasing tube 2.1 at both ends along its axis is kept as consistent as possible; the distance between adjacent groove areas is 6mm~8mm. In this embodiment, the groove areas on the pressure-releasing tube 2.1 are arranged from top to bottom as follows: middle groove area 2.1.2, shallow groove area 2.1.3, deep groove area 2.1.1, shallow groove area 2.1.3, deep groove area 2.1.1, shallow groove area 2.1.3, middle groove area 2.1.2, as shown in FIG. Figure 3 shown.

[0042] The deep groove area 2.1.1, the medium groove area 2.1.2 and the shallow groove area 2.1.3 are all provided with a plurality of annular grooves; in this embodiment, the spacing between adjacent annular grooves in each groove area is 2mm~4mm, and the width of the annular grooves is 2mm~4mm, which is convenient for realizing the compression deformation of the pressure-releasing pipe 2.1 when it is subjected to the surrounding rock pressure. The groove depth and groove interval can be adjusted according to the actual support requirements, and the axial compressive stiffness and limited deformation of the pressure-releasing pipe 2.1 can be adjusted to different degrees through different combinations of the groove depth and groove interval.

[0043] The pressure-releasing assembly 2 further comprises a connecting plate 1 2.2 disposed at both ends of the pressure-releasing pipe 2.1, wherein the connecting plate 1 2.2 is connected to the adjacent arch frame unit 1. In this embodiment, the connecting plate 1 2.2 and the pressure-releasing pipe 2.1 are fixedly connected by welding; a connecting plate 2 1.1 is disposed at the end where the arch frame unit 1 is connected to the pressure-releasing assembly 2, and the connecting plate 2 1.1 and the connecting plate 1 2.2 are both provided with corresponding connecting holes, such as Figure 2 , Figure 4 and Figure 5 As shown, four circular connection holes are provided at the four corners of the connecting plate 1 2.2 and the connecting plate 2 1.1, and the connecting plate 1 2.2 and the connecting plate 2 1.1 are fixedly connected by bolts passing through the connection holes, thereby forming an arc-shaped arch frame with a pressure-yielding support function to support the tunnel. In this embodiment, the connecting plate 1 2.2 and the connecting plate 2 1.1 are both made of high-strength steel plates. The arch frame unit 1 also includes an arc-shaped arch frame segment 1.2 welded to the connecting plate 2 1.1, and the arch frame segment 1.2 is made of I-beam.

[0044] See also Figure 2, limit pieces 2.2.1 are provided on both sides of the connecting plate 2.2; stiffness limiting plates 2.3 are provided on both sides of the yielding assembly 2 for cooperating with the limit pieces 2.2.1 on the same side, for enhancing the local lateral stiffness of the yielding support structure during the surrounding rock support process, and avoiding twisting of the yielding assembly 2, which affects the support effect. When stiffness limiting plates 2.3 are not provided on both sides of the yielding assembly 2, the yielding assembly 2 is only resisted by the yielding tube 2.1 against lateral shear force and bending moment; when stiffness limiting plates 2.3 are provided on both sides of the yielding assembly 2, the yielding assembly 2 is jointly resisted by two stiffness limiting plates 2.3 and the yielding tube 2.1 against lateral shear force and bending moment; from the force analysis, it can be obtained that when the stiffness limiting plates 2.3 are provided, the overall shear stiffness of the yielding assembly 2 can be increased by 5.6 times, and the bending stiffness can be increased by 4.2 times. By setting the stiffness limiting plates 2.3 on both sides of the pressure-releasing component 2, the lateral stiffness of the adaptive variable resistance pressure-releasing support structure can be enhanced. While limiting the lateral displacement, the vertical compression deformation of the pressure-releasing component 2 during the variable resistance pressure-releasing process (i.e., the axial compression deformation of the pressure-releasing tube 2.1) is not affected, and the pressure-releasing component 2 arranged in the initial support structure of the tunnel is guaranteed to have sufficient lateral stiffness. The pressure-releasing component 2 can be flexibly arranged in the initial support structure of the tunnel, so that the pressure-releasing support structure in this application has strong adaptability and better practical performance. In this embodiment, the stiffness limiting plate 2.3 is made of a high-strength steel plate with a thickness of 10 mm to 20 mm.

[0045] See also Figure 6 The stiffness limiting plate 2.3 is provided with a slide groove 2.3.1 along the center line of the plate surface to enable the limiting member 2.2.1 to slide in the slide groove 2.3.1; the length direction of the slide groove 2.3.1 is parallel to the axial direction of the pressure-releasing tube 2.1, so as to limit the lateral displacement of the pressure-releasing assembly 2 while avoiding affecting the axial compression of the pressure-releasing tube 2.1.

[0046] In this embodiment, the stopper 2.2.1 is a bolt assembly, which includes a long screw rod welded to both sides of the connecting plate 2.2 and a locking nut installed at the free end of the long screw rod; the specification of the long screw rod is M12, the material is 45# steel, the length is set to 30mm~35mm, and it is fixedly installed at the center of the edge surface of both sides of the connecting plate 2.2 by welding, such as Figure 4 When in use, the long screw rod is passed through the rigidity limiting plate 2.3 and then locked by the locking nut so that the long screw rod can slide in the slide groove 2.3.1.

[0047] The manufacturing and use method of the above-mentioned yielding support structure is as follows:

[0048] Step 1: Making a pressure relief pipe 2.1: Cut a high-rigidity thick-walled hollow steel pipe to obtain a 20cm~30cm long hollow steel pipe, and then use a machine tool to make grooves. First, start cutting from the two ends of the hollow steel pipe with a cutting depth of 40%~60% of the pipe wall thickness to prepare a medium groove area 2.1.2, until the cutting working surface is 2 / 3 of the total length from the center of the hollow steel pipe, use 20%~40% of the pipe wall thickness as the cutting depth to prepare a shallow groove area 2.1.3; until the cutting working surfaces on both sides are 1 / 2 of the total length from the center of the hollow steel pipe, use 60%~80% of the pipe wall thickness as the cutting depth to prepare a deep groove area 2.1.1; until the cutting working surfaces on both sides are 5 / 6 of the total length from the center of the hollow steel pipe, use 20%~40% of the pipe wall thickness as the cutting depth to prepare a shallow groove area 2.1.3, until the full length of the hollow steel pipe is cut, and the production of the pressure relief pipe 2.1 is completed;

[0049] Step 2: Making the connection plate 1 2.2 and the connection plate 2 1.1: Cut the high-strength steel plate into a square steel plate, and use a machine tool to prepare connection holes at the four corners of the square steel plate to complete the production of the connection plate 2 1.1; when making the connection plate 1 2.2, it is also necessary to weld M12 long screws on both sides of the square steel plate;

[0050] Step 3: Making the stiffness limiting plate 2.3: Cut the high-strength steel plate into a square steel plate, and then use a machine tool to cut a U-shaped slide groove 2.3.1 at the center line of the square steel plate surface to complete the making of the stiffness limiting plate 2.3;

[0051] Step 4: Assembly of the pressure-releasing assembly 2: Weld the two connecting plates 2.2 to the two ends of the pressure-releasing tube 2.1 respectively, and make the limiting pieces 2.2.1 of the two connecting plates 2.2 correspond to each other and parallel, so that the axial position of the long screw in the limiting piece 2.2.1 remains consistent, and then install the two rigidity limiting plates 2.3 on both sides of the two connecting plates 2.2, so that the long screw passes through the slide groove 2.3.1 of the rigidity limiting plate 2.3, and fix the long screw and the rigidity limiting plate 2.3 with a locking nut to complete the assembly of the pressure-releasing assembly 2.

[0052] Step 5: Use of the yielding support structure: Connect the arch frame unit 1 with the yielding assembly 2 at the place where the tunnel needs support, align the connection holes of the connecting plate 1 2.2 and the connecting plate 2 1.1, and adjust the position of the yielding assembly 2 until the surface of the stiffness limiting plate 2.3 faces the tunnel rock surface. Fix the connecting plate 1 2.2 and the connecting plate 2 1.1 with bolts to achieve adaptive variable resistance yielding support for large deformation tunnels.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A yield support structure, characterized in that: The invention comprises a plurality of arch frame units (1) and a plurality of pressure-releasing components (2); adjacent arch frame units (1) are connected via the pressure-releasing components (2); the pressure-releasing components (2) comprise a pressure-releasing pipe (2.1), and at least two concave pattern areas with different concave depths are provided on the outer wall of the pressure-releasing pipe (2.1) along the axial direction of the pressure-releasing pipe (2.1); The outer wall of the pressure-releasing tube (2.1) is provided with a deep groove zone (2.1.1), a medium groove zone (2.1.2) and a shallow groove zone (2.1.3); the depression depth of the deep groove zone (2.1.1) is 60% to 80% of the wall thickness of the pressure-releasing tube (2.1), the depression depth of the medium groove zone (2.1.2) is 40% to 60% of the wall thickness of the pressure-releasing tube (2.1), and the depression depth of the shallow groove zone (2.1.3) is 20% to 40% of the wall thickness of the pressure-releasing tube (2.1).

2. A pressure-yielding support structure according to claim 1, characterized in that: The deep groove area (2.1.1), the middle groove area (2.1.2) and the shallow groove area (2.1.3) are symmetrically arranged around the center of the length direction of the pressure relief tube (2.1), and the distance between adjacent groove areas is 6 mm to 8 mm.

3. A pressure-yielding support structure according to claim 2, characterized in that: The deep groove area (2.1.1), the medium groove area (2.1.2) and the shallow groove area (2.1.3) are all provided with a plurality of annular grooves; the spacing between adjacent annular grooves in each groove area is 2 mm to 4 mm.

4. A pressure-yielding support structure according to claim 3, characterized in that: The width of the annular groove is 2 mm to 4 mm.

5. The pressure-yielding support structure according to claim 1, characterized in that: The pressure-releasing assembly (2) further comprises a connecting plate (2.2) provided at both ends of the pressure-releasing pipe (2.1), wherein the connecting plate (2.2) is connected to an adjacent arch frame unit (1).

6. A pressure-yielding support structure according to claim 5, characterized in that: The end portion where the arch frame unit (1) is connected to the pressure-releasing assembly (2) is provided with a second connecting plate (1.1), and both the second connecting plate (1.1) and the first connecting plate (2.2) are provided with connecting holes.

7. A pressure-yielding support structure according to claim 5 or 6, characterized in that: Limiting pieces (2.2.1) are provided on both sides of the connecting plate 1 (2.2); and rigidity limiting plates (2.3) for cooperating with the limiting pieces (2.2.1) on the same side are provided on both sides of the pressure-releasing assembly (2).

8. The pressure-yielding support structure according to claim 7, characterized in that: The rigidity limiting plate (2.3) is provided with a slide groove (2.3.1) for enabling the limiting member (2.2.1) to slide in the slide groove (2.3.1); the length direction of the slide groove (2.3.1) is parallel to the axial direction of the pressure relief tube (2.1).

9. The pressure-yielding support structure according to claim 7, characterized in that: The limiting member (2.2.1) is a bolt assembly.

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