U-shaped steel connecting device with crumple energy absorption effect

Abstract

The invention relates to the technical field of coal mine safety support, and provides a U-shaped steel connecting device with a crumple energy absorption effect, which comprises a pair of U-shaped steels which are mutually lapped and partially overlapped; the clamping and connecting mechanism is arranged at the overlapping position of the U-shaped steel and comprises a pair of clamping plates and an energy absorption connecting piece, the clamping plates are arranged at the top and the bottom of the overlapping portion of the U-shaped steel respectively and connected with the free ends of the U-shaped steel located at the overlapping portion respectively, and the energy absorption connecting piece is connected with the clamping plates. The pair of clamping plates can generate opposite acting force on the corresponding U-shaped steel when the pair of U-shaped steel moves in a staggered mode in the first direction. The energy absorption connecting pieces are arranged on the two sides of the pair of U-shaped steel and connected between the pair of clamping plates, a plurality of crumple holes are formed in the energy absorption connecting pieces in the first direction, and at least one crumple hole can deform to absorb impact energy when the pair of U-shaped steel moves in a staggered mode in the first direction; and the reliability of shrinkage deformation of the U-shaped steel and the effectiveness of supporting are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine safety support, and in particular to a U-shaped steel connection device with collapse energy absorption function. Background Art

[0002] In recent years, with the gradual depletion of shallow coal resources, coal mining has gradually extended to deeper levels. The surrounding rock of the tunnel has been affected by "three highs and one disturbance". Deep mining is very likely to cause dynamic disasters such as impact ground pressure, resulting in coal wall spalling, roof subsidence, bottom bulging, tunnel closure and even casualties.

[0003] Traditional support forms often cannot meet the current needs of safe production in coal mines. For example, a U-shaped steel metal support is composed of multiple overlapping arc beams, and the overlapping sections are fixedly connected by cable clamps. When the surrounding rock is deformed, the overlapping arc beams slide relative to each other by resisting friction, thereby achieving dislocation and giving way, thereby ensuring the safety of tunnel support.

[0004] However, in the actual tunnel support process, it is difficult to maintain the friction force of the arc beam in the overlap area. The magnitude of the friction force is proportional to the positive stress borne by the overlap area, and the positive stress is determined by the preload of the clamp. At the same time, the friction force is also affected by the friction coefficient of the contact surface. The inner and outer surfaces of the arc beam of the conventional U-shaped steel support are smooth, and the friction coefficient is theoretically constant, but the harsh underground environment causes the surface to rust easily, thereby increasing the friction coefficient. When the impact ground pressure exceeds the limit load of the support and the arc beam does not produce relative displacement, the U-shaped steel support may be twisted and deformed, eventually leading to support failure, seriously affecting the safe production of the coal mine. In addition, when the U-shaped steel support shrinks, especially when it shrinks under the action of impact load, the support joints usually slip instantaneously, sparks are generated, and the preload force of the clamp is reduced after sliding, which also seriously affects the stability of the bearing capacity of the U-shaped steel support. Summary of the invention

[0005] The invention provides a U-shaped steel connection device with a collapse energy absorption function, which is used to solve the problem of poor stability of the bearing capacity of the U-shaped steel bracket in the prior art.

[0006] The present invention provides a U-shaped steel connection device with a collapse energy absorption function, comprising: A pair of U-shaped steels, the pair of U-shaped steels overlap each other and partially overlap; A clamping connection mechanism is arranged at the overlapping part of a pair of U-shaped steels, and the clamping connection mechanism includes a pair of clamping plates and an energy absorbing connection piece. The pair of clamping plates are respectively arranged at the top and bottom of the overlapping part of the pair of U-shaped steels, and are respectively connected to the free ends of the pair of U-shaped steels located at the overlapping part. The pair of clamping plates can respectively generate a reverse force on the corresponding U-shaped steels when the pair of U-shaped steels make a staggered movement along the first direction; The energy absorbing connecting piece is arranged on both sides of a pair of U-shaped steels and connected between a pair of clamping plates. A plurality of collapse holes are arranged on the energy absorbing connecting piece along a first direction. At least one of the collapse holes can be deformed to absorb impact energy when the pair of U-shaped steels make staggered motion along the first direction.

[0007] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, a pair of U-shaped steels includes a first U-shaped steel and a second U-shaped steel, and the first U-shaped steel is overlapped in the cavity of the second U-shaped steel.

[0008] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, a pair of clamping plates includes a first clamping plate and a second clamping plate, the first clamping plate contacts the open end of the first U-shaped steel, and the second clamping plate contacts the bottom of the second U-shaped steel.

[0009] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, a first baffle is provided at one end of the first clamping plate, and the first baffle abuts against the end of the first U-shaped steel located in the overlapping part, and a second baffle is provided at the end of the second clamping plate away from the first baffle, and the second baffle abuts against the end of the second U-shaped steel located in the overlapping part.

[0010] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, the second clamping plate is provided with a groove, and the groove is adapted to the bottom of the second U-shaped steel.

[0011] The U-shaped steel connection device with collapse energy absorption function provided by the present invention also includes connecting bolts, which are distributed on both sides of the second U-shaped steel. The connecting bolts pass through the first clamping plate, the energy absorbing connecting piece and the second clamping plate in sequence to clamp the overlapping part of the first U-shaped steel and the second U-shaped steel between the first clamping plate and the second clamping plate.

[0012] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, first sliding connection holes are provided on both sides of the first clamping plate, second sliding connection holes are provided on both sides of the second clamping plate, and the energy absorbing connection piece is provided with a through hole for the connecting bolt to pass through. The connecting bolt passes through the first sliding connection hole, the through hole and the second sliding connection hole in sequence, and the connecting bolt can move in the first sliding connection hole and the second sliding connection hole along the first direction.

[0013] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, the first sliding connection hole is a strip hole, and the length direction of the first sliding connection hole is the same as the first direction; the second sliding connection hole is a strip hole, and the length direction of the second sliding connection hole is the same as the first direction.

[0014] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, the energy absorption connection piece is in a U-shaped structure, including a first connection section, an intermediate connection section and a second connection section, the first connection section, the intermediate connection section and the second connection section are all provided with a plurality of collapse holes along a first direction, and the through holes are provided at both ends of the first connection section and the second connection section, the first connection section is in contact with the inner side of the first clamping plate, the second connection section is in contact with the inner side of the second clamping plate, and the two ends of the intermediate connection section are respectively vertically connected to the first connection section and the second connection section.

[0015] According to the U-shaped steel connection device with collapse energy absorption function provided by the present invention, the energy absorption connection piece is in the shape of a rectangular tube, including a pair of first side plates and a pair of second side plates, and a plurality of grooves or collapse holes are arranged on the four side plates along the first direction, and the pair of the first side plates are respectively in contact with the inner sides of the first clamping plate and the second clamping plate, and the through holes are arranged at both ends of the first side plates.

[0016] The invention provides a U-shaped steel connection device with a collapse energy absorption effect. By overlapping and partially overlapping a pair of U-shaped steels, and cooperating with the design of a clamping connection mechanism, the whole device can maintain a high structural stability when subjected to external impact or vibration. A pair of clamping plates not only strengthens the connection between the overlapping parts of the pair of U-shaped steels, but also effectively avoids the pair of U-shaped steels from relatively shifting along their length direction, thereby improving the shear resistance and rigidity of the overall structure. By arranging energy-absorbing connectors on both sides of a pair of U-shaped steels and connecting them between a pair of clamping plates, when the device is subjected to external impact, the pair of U-shaped steels make staggered movements along a first direction, at which time the collapse holes on the energy-absorbing connectors will deform or even close, and in this process, the impact energy is absorbed by the plastic deformation of the metal material. Since the device can respond quickly when subjected to impact and absorb a large amount of energy through the deformation of the collapse holes, the situation of eccentric loading can be avoided, the accurate giving way of the U-shaped steel nodes is guaranteed, and the reliability of the shrinkage deformation of the U-shaped steels and the effectiveness of the support are guaranteed, so that the tunnel surrounding rock reaches a new balanced and stable state, thereby effectively ensuring the safe production of the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the overall structure of a U-shaped steel connection device with collapse energy absorption function provided by an embodiment of the present invention; Figure 2 A side view of a U-shaped steel connection device with collapse energy absorption function provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a second splint provided in an embodiment of the present invention; Figure 4 One of the overall structural schematic diagrams of the energy absorbing connector provided in an embodiment of the present invention; Figure 5 The second schematic diagram of the overall structure of the energy absorbing connector provided by the embodiment of the present invention; Figure 6 The third schematic diagram of the overall structure of the energy-absorbing connecting piece provided in an embodiment of the present invention.

[0019] Figure 7 This is a fourth schematic diagram of the overall structure of the energy-absorbing connecting piece provided in an embodiment of the present invention.

[0020] Figure 8This is one of the overall structural schematic diagrams of an energy-absorbing connector provided in another embodiment of the present invention.

[0021] Fig. 9 The second schematic diagram of the overall structure of the energy absorbing connector provided by another embodiment of the present invention Reference numerals: 1. Energy absorbing connector; 11. First connecting section; 12. Middle connecting section; 13. Second connecting section; 14. Through hole; 15. First side plate; 16. Second side plate; 2. Shrinkage holes; 3. first U-shaped steel; 4. second U-shaped steel; 5. first clamping plate; 51. first baffle plate; 52. first sliding connection hole; 6. Second clamping plate; 61. Second baffle plate; 62. Second sliding connection hole; 7. Connecting bolt. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Combine the following Figure 1-Figure 9 The invention describes a U-shaped steel connection device with collapse energy absorption function.

[0024] The embodiment of the present invention provides a U-shaped steel connection device with a collapse energy absorption function, comprising: A pair of U-shaped steel and clamping connection mechanism.

[0025] Specifically, a pair of U-shaped steels overlap each other and partially overlap, and a clamping connection mechanism is arranged at the overlapping part of a pair of U-shaped steels. The clamping connection mechanism includes a pair of clamping plates and an energy-absorbing connection member 1. The pair of clamping plates are respectively arranged at the top and bottom of the overlapping part of the pair of U-shaped steels, and are respectively connected to the free ends of the pair of U-shaped steels located at the overlapping part. The pair of clamping plates can generate a reverse force on the corresponding U-shaped steels when the pair of U-shaped steels make an interlaced movement along a first direction, wherein the first direction is the length direction of the U-shaped steel; that is, the pair of clamping plates can prevent the pair of U-shaped steels from relative displacement along their length direction while clamping the pair of U-shaped steels.

[0026] The energy-absorbing connector 1 is arranged on both sides of a pair of U-shaped steels and connected between a pair of clamping plates. A plurality of collapse holes 2 are arranged on the energy-absorbing connector 1 along a first direction. At least one collapse hole 2 can be deformed to absorb impact energy when a pair of U-shaped steels make staggered motion along the first direction.

[0027] It can be seen from the above scheme that the present invention adopts traditional U-shaped steel, overlaps a pair of U-shaped steels with each other and partially overlaps, and cooperates with the design of the clamping connection mechanism, so that the entire device can maintain a high structural stability when subjected to external impact or vibration. A pair of clamping plates not only strengthens the connection between the overlapping parts of a pair of U-shaped steels, but also effectively avoids the relative displacement of a pair of U-shaped steels along their length direction, thereby improving the shear resistance and rigidity of the overall structure; by arranging energy-absorbing connectors 1 on both sides of a pair of U-shaped steels and connecting them between a pair of clamping plates, when the device is subjected to external impact, a pair of U-shaped steels make staggered movements along a first direction, at which time the collapse holes 2 on the energy-absorbing connectors 1 will deform or even close, and in this process, the impact energy is absorbed by the plastic deformation of the metal material. Since the device can respond quickly when subjected to impact and absorb a large amount of energy through the deformation of the collapse holes 2, the situation of eccentric loading can be avoided, the accurate giving way of the U-shaped steel nodes is guaranteed, and the reliability of the shrinkage deformation of the U-shaped steel and the effectiveness of the support are guaranteed, so that the tunnel surrounding rock reaches a new balanced and stable state, thereby effectively ensuring the safe production of the coal mine.

[0028] like Figure 1-Figure 2 As shown, a pair of U-shaped steels in this embodiment include a first U-shaped steel 3 and a second U-shaped steel 4, the first U-shaped steel 3 is overlapped in the cavity of the second U-shaped steel 4, and two adjacent U-shaped steels are overlapped with each other to form a combined bracket; a pair of clamping plates include a first clamping plate 5 and a second clamping plate 6, the first clamping plate 5 is in contact with the open end of the first U-shaped steel 3, and the second clamping plate 6 is in contact with the bottom of the second U-shaped steel 4, that is, the overlapping parts of the first U-shaped steel 3 and the second U-shaped steel 4 are clamped and fixed in the space between the first clamping plate 5 and the second clamping plate 6.

[0029] Preferably, the first clamping plate 5 and the second clamping plate 6 provided in this embodiment are both made of high-strength steel. Compared with the traditional cable clamp structure, they have the characteristics of high rigidity and large protected surface area. They can effectively improve the bearing capacity of the U-shaped steel node in the radial direction along the tunnel section, and solve the problem that the traditional U-shaped steel cable clamp structure is prone to instability in the plane.

[0030] Furthermore, the second clamping plate 6 is provided with a groove, and the groove is adapted to the bottom of the second U-shaped steel 4, so that the second clamping plate 6 can better clamp the second U-shaped steel 4 from the outside.

[0031] In some embodiments, a first baffle 51 is provided at one end of the first clamping plate 5, and the first baffle 51 abuts against the end of the first U-shaped steel 3 located at the overlapping portion, and a second baffle 61 is provided at one end of the second clamping plate 6 away from the first baffle 51, and the second baffle 61 abuts against the end of the second U-shaped steel 4 located at the overlapping portion; Figure 2As shown, the first baffle 51 can be a rectangular plate, which is arranged at one end of the first clamping plate 5, and is used to abut against the end of the first U-shaped steel 3; the second baffle 61 can be an arc-shaped plate, which is arranged at the end of the second clamping plate 6, and can be arranged at the end of the groove part, and is used to abut against the end of the second U-shaped steel 4; thereby, during the contraction and sliding process of the U-shaped steel, the first U-shaped steel 3 pushes the first baffle 51, thereby driving the first clamping plate 5 to slide together, and the second U-shaped steel 4 pushes the second baffle 61, thereby driving the second clamping plate 6 to slide together.

[0032] With such arrangement, through the design of the first baffle plate 51 and the second baffle plate 61, the movement of the U-shaped steel along its length direction can be further restricted, the ability to resist impact can be improved, and the overlapping parts of a pair of U-shaped steels can be more firmly fixed to ensure that they will not easily slide or dislocate when subjected to external forces, thereby improving the overall stability of the device and enhancing the reliability of the connection points.

[0033] In addition, the positions of the two baffles can be adjusted to adapt to U-shaped steels of different specifications to ensure a good connection effect. If the relative positions between the U-shaped steels need to be adjusted, this can also be achieved by changing the positions of the two baffles along the first direction.

[0034] In this embodiment, it also includes connecting bolts 7, which are high-strength bolts. The connecting bolts 7 are distributed on both sides of the second U-shaped steel 4. The connecting bolts 7 pass through the first clamping plate 5, the energy-absorbing connector 1 and the second clamping plate 6 in sequence, and clamp the overlapping part of the first U-shaped steel 3 and the second U-shaped steel 4 between the first clamping plate 5 and the second clamping plate 6.

[0035] In this way, the energy-absorbing connector 1 is fixed to a pair of clamping plates by connecting bolts 7 passing through both sides of the second U-shaped steel 4. During the shrinkage and sliding process of the U-shaped steel, the energy-absorbing connector 1 is squeezed by the connecting bolts 7 on both sides, and its collapse hole 2 is gradually squeezed and closed. In this process, energy is absorbed by the plastic deformation of the metal material.

[0036] Specifically, first sliding connection holes 52 are provided on both sides of the first clamping plate 5, and a pair of holes may be provided on each side, so that first sliding connection holes 52 are provided at the four corners of the first clamping plate 5; second sliding connection holes 62 are provided on both sides of the second clamping plate 6, and similarly, second sliding connection holes 62 are provided at the four corners of the second clamping plate 6, and the energy absorbing connector 1 is provided with a through hole 14 for the connecting bolt 7 to pass through, and the through hole 14 is adapted to the connecting bolt 7, and the connecting bolt 7 passes through the first sliding connection hole 52, the through hole 14 and the second sliding connection hole 62 in sequence, and the connecting bolt 7 can move in the first sliding connection hole 52 and the second sliding connection hole 62 along the first direction.

[0037] In this way, the design of the sliding connection hole allows the connection bolt 7 to move within a certain range along the length direction of the U-shaped steel, so that when the device is subjected to external impact, the U-shaped steel can be relatively displaced to a certain extent, reducing the stress concentration phenomenon at the connection part, and the impact force can be more evenly distributed at the connection part, thereby better absorbing and dispersing the impact energy and extending the service life of the device. In addition, through the movement of the connection bolt 7, the collapse hole 2 on the energy-absorbing connector 1 can be more fully deformed during the impact process, thereby more effectively absorbing the impact energy and improving the efficiency of energy absorption.

[0038] In addition, the device can be better adapted to the use requirements under different working conditions. For example, under temperature changes or long-term vibration environments, the U-shaped steel may undergo slight dimensional changes, and the sliding connection hole can allow these changes without affecting the reliability of the connection.

[0039] In some embodiments, the first sliding connection hole 52 is a bar-shaped hole, and the length direction of the first sliding connection hole 52 is the same as the first direction; the second sliding connection hole 62 is a bar-shaped hole, and the length direction of the second sliding connection hole 62 is the same as the first direction.

[0040] Reference Figure 4 In this embodiment, the energy absorbing connecting member 1 has a U-shaped structure, including a first connecting section 11, an intermediate connecting section 12 and a second connecting section 13. The first connecting section 11, the intermediate connecting section 12 and the second connecting section 13 are all provided with a plurality of collapse holes 2 along the first direction, and through holes 14 are provided at both ends of the first connecting section 11 and the second connecting section 13. The first connecting section 11 contacts the inner side of the first clamping plate 5, the second connecting section 13 contacts the inner side of the second clamping plate 6, and the two ends of the intermediate connecting section 12 are respectively vertically connected to the first connecting section 11 and the second connecting section 13.

[0041] In this way, the first connecting section 11 contacts the inner side of the first clamping plate 5, and the second connecting section 13 contacts the inner side of the second clamping plate 6. This multi-point contact design increases the stability of the connection between the energy-absorbing connector 1 and a pair of clamping plates, preventing the U-shaped steel from sliding or dislocating when subjected to external force; and this multi-section design can not only enhance the structural stability and reliability of the energy-absorbing connector 1, but also enable multiple areas to deform simultaneously when impacted, so that the impact force can be more evenly distributed on each connecting section, avoiding the situation of excessive local force, thereby more efficiently absorbing and dispersing the impact energy, and improving the overall impact resistance.

[0042] Alternatively, if Figure 4-Figure 7As shown, the collapse hole 2 on the first connecting section 11 and the second connecting section 13 can be a circular hole, a rectangular hole, a hexagonal hole, etc.; the collapse hole 2 on the middle connecting section 12 can be a strip hole, in addition, it also includes but is not limited to elliptical, diamond, crescent and other shapes, and the size of the collapse hole 2 is determined according to the actual required sliding stroke.

[0043] Reference Figure 8-Figure 9 In other embodiments, the energy-absorbing connector 1 is in a rectangular tube shape, including a pair of first side plates 15 and a pair of second side plates 16. A plurality of collapse holes 2 are arranged on the four side plates along the first direction, and of course, they can also be arranged as a plurality of grooves, preferably arc-shaped grooves; the pair of first side plates 15 are in contact with the inner sides of the first clamping plate 5 and the second clamping plate 6 respectively, and through holes 14 are arranged at both ends of the first side plates 15.

[0044] With such arrangement, compared with the U-shaped structure, the rectangular tube can further improve the stability of the connection between the energy-absorbing connector 1 and a pair of clamping plates while achieving the effect of absorbing and dispersing impact energy, thereby enhancing the structural stability and reliability of the energy-absorbing connector 1.

[0045] The working process of a U-shaped steel connection device with collapse energy absorption function provided by the present embodiment is as follows: first, overlap the first U-shaped steel 3 on the first U-shaped steel 3 to ensure that the length of the overlapping part is the same as the length of a pair of clamping plates; buckle the first clamping plate 5 on the open end of the first U-shaped steel 3, and make the end of the U-shaped steel in the overlapping part contact with the first baffle 51 of the first clamping plate 5; install the second clamping plate 6 on the outer side of the bottom end of the first U-shaped steel 3, so that the end of the U-shaped steel in the overlapping part contacts with the second baffle 61 of the second clamping plate 6; place the energy absorption connecting members 1 on both sides in the middle of a pair of clamping plates, and pass the connecting bolts 7 through the first sliding connection hole 52 of the first clamping plate 5, the through hole 14 on the energy absorption connecting member 1 and the second sliding connection hole 62 of the second clamping plate 6, so as to clamp the overlapping part of the U-shaped steel between the first clamping plate 5 and the second clamping plate 6, and the pre-tightening force applied by the connecting bolts 7 is calculated and determined according to the specific parameters of the actual coal mine tunnel.

[0046] When impact ground pressure occurs, and when the impact ground pressure exceeds the limit load that the U-shaped steel retractable support can withstand, the two sections of U-shaped steel are relatively displaced to make way, and the sliding of a pair of U-shaped steels pushes the baffles corresponding to their respective ends to drive the clamping plates to move together. Due to the limiting effect of the sliding connection holes, the connecting bolts 7 slide in the first sliding connection holes 52 and the second sliding connection holes 62. In this process, due to the limitation of the connecting bolts 7 on both sides, the energy-absorbing connecting piece 1 is squeezed, thereby causing the collapse hole 2 to be gradually squeezed and closed. The impact energy generated by the impact ground pressure acting on the tunnel is continuously absorbed through the plastic deformation of the metal material, avoiding the occurrence of eccentric loading, ensuring the accurate making way of the U-shaped steel nodes, and at the same time ensuring the reliability of shrinkage deformation and the effectiveness of support, so that the tunnel surrounding rock reaches a new balanced and stable state, thereby effectively ensuring the safe production of the coal mine.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A U-shaped steel connection device with collapse energy absorption function, characterized in that: include: A pair of U-shaped steels, the pair of U-shaped steels overlap each other and partially overlap; A clamping connection mechanism is arranged at the overlapping part of the pair of U-shaped steels, the clamping connection mechanism comprises a pair of clamping plates and an energy absorbing connection member (1), the pair of clamping plates are respectively arranged at the top and bottom of the overlapping part of the pair of U-shaped steels, and are respectively connected to the free ends of the pair of U-shaped steels located at the overlapping part, and the pair of clamping plates can respectively generate a reverse force on the corresponding U-shaped steels when the pair of U-shaped steels make a staggered movement along a first direction; The energy absorbing connecting piece (1) is arranged on both sides of a pair of U-shaped steels and connected between a pair of clamping plates. A plurality of collapse holes (2) are arranged on the energy absorbing connecting piece (1) along a first direction. At least one of the collapse holes (2) can be deformed to absorb impact energy when the pair of U-shaped steels make staggered movements along the first direction.

2. The U-shaped steel connection device with collapse energy absorption function according to claim 1 is characterized in that: The pair of U-shaped steels comprises a first U-shaped steel (3) and a second U-shaped steel (4), wherein the first U-shaped steel (3) is overlapped in the cavity of the second U-shaped steel (4).

3. The U-shaped steel connection device with collapse energy absorption function according to claim 2 is characterized in that: The pair of clamping plates comprises a first clamping plate (5) and a second clamping plate (6), wherein the first clamping plate (5) contacts the open end of the first U-shaped steel (3), and the second clamping plate (6) contacts the bottom of the second U-shaped steel (4).

4. The U-shaped steel connection device with collapse energy absorption function according to claim 3 is characterized in that: A first baffle (51) is provided at one end of the first clamping plate (5), and the first baffle (51) abuts against the end of the first U-shaped steel (3) located at the overlapping portion; a second baffle (61) is provided at one end of the second clamping plate (6) away from the first baffle (51), and the second baffle (61) abuts against the end of the second U-shaped steel (4) located at the overlapping portion.

5. The U-shaped steel connection device with collapse energy absorption function according to claim 3, characterized in that: The second clamping plate (6) is provided with a groove, and the groove is adapted to fit the bottom of the second U-shaped steel (4).

6. The U-shaped steel connection device with collapse energy absorption function according to claim 3, characterized in that: It also includes connecting bolts (7), which are distributed on both sides of the second U-shaped steel (4). The connecting bolts (7) pass through the first clamping plate (5), the energy absorbing connecting member (1) and the second clamping plate (6) in sequence, so as to clamp the overlapping portion of the first U-shaped steel (3) and the second U-shaped steel (4) between the first clamping plate (5) and the second clamping plate (6).

7. The U-shaped steel connection device with collapse energy absorption function according to claim 6, characterized in that: First sliding connection holes (52) are provided on both sides of the first clamping plate (5), second sliding connection holes (62) are provided on both sides of the second clamping plate (6), the energy absorbing connecting member (1) is provided with a through hole (14) for the connecting bolt (7) to pass through, the connecting bolt (7) passes through the first sliding connection hole (52), the through hole (14) and the second sliding connection hole (62) in sequence, and the connecting bolt (7) can move in the first sliding connection hole (52) and the second sliding connection hole (62) along a first direction.

8. The U-shaped steel connection device with collapse energy absorption function according to claim 7, characterized in that: The first sliding connection hole (52) is a strip-shaped hole, and the length direction of the first sliding connection hole (52) is the same as the first direction; the second sliding connection hole (62) is a strip-shaped hole, and the length direction of the second sliding connection hole (62) is the same as the first direction.

9. The U-shaped steel connection device with collapse energy absorption function according to claim 7, characterized in that: The energy absorbing connecting member (1) has a U-shaped structure, comprising a first connecting section (11), an intermediate connecting section (12) and a second connecting section (13); the first connecting section (11), the intermediate connecting section (12) and the second connecting section (13) are all provided with a plurality of collapse holes (2) along a first direction, and the through holes (14) are provided at both ends of the first connecting section (11) and the second connecting section (13); the first connecting section (11) is in contact with the inner side of the first clamping plate (5), the second connecting section (13) is in contact with the inner side of the second clamping plate (6), and the two ends of the intermediate connecting section (12) are respectively vertically connected to the first connecting section (11) and the second connecting section (13).

10. The U-shaped steel connection device with collapse energy absorption function according to claim 7, characterized in that: The energy absorbing connecting piece (1) is in the shape of a rectangular tube and comprises a pair of first side plates (15) and a pair of second side plates (16). A plurality of grooves or the collapse holes (2) are arranged on the four side plates along a first direction. The pair of the first side plates (15) are in contact with the inner sides of the first clamping plate (5) and the second clamping plate (6), respectively, and the through holes (14) are arranged at both ends of the first side plates (15).

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