Crossing frame with grid-type shear energy absorption device and energy consumption value calculation method

Abstract

The present invention belongs to the technical field of spanning frames for wireline construction, and specifically relates to a spanning frame with a grid-type shear energy absorption device and a method for calculating energy consumption. The present invention also includes a shear energy absorption device, the shell of the shear energy absorption device is fixed on the vertical pole, and the working end of the shear energy absorption device is fixed to the predetermined impacted rod section by a pull rope, wherein: the shear energy absorption device also includes a core shaft located in the shell and capable of reciprocating sliding along the axial direction of the shell, and one end of the core shaft constitutes the working end; radial guide rails and a slide that can perform radial displacement along the radial guide rails are arranged beside the core shaft, and the slide and the core shaft are connected to each other by an energy absorption block that can generate deformation energy absorption along the axial direction of the core shaft. The present invention has the advantages of compact structure and easy use, and can effectively improve the ability of the spanning frame to resist the impact of conductors based on the existing spanning frame, and ultimately prevent the conductors from interfering with the infrastructure under the spanning frame.

Description

Technical Field

[0001] The invention belongs to the technical field of a spanning frame for line construction, and in particular relates to a spanning frame with a grid-type shear energy absorption device and an energy consumption value calculation method. Background Art

[0002] In recent years, the construction and renovation of high-voltage transmission lines often intersect and interlace with important projects such as high-speed railways, highways, and bridges. In order to ensure the normal operation of the above-mentioned infrastructure projects, a spanning frame structure is generally used to achieve the spanning protection of the transmission line. However, due to the successive commissioning of large-section conductors and the significant increase in the impact load of the conductors under accident conditions, the impact force on the spanning frame is also increasing at the moment the conductor falls, and the impact resistance of the traditional spanning frame has been difficult to meet the actual needs. In particular, most of the current spanning frames use bamboo, crossbars or lattices, which are fixed rigid bodies; due to the short impact time of the conductor, the impact force is large, which often causes rigid damage to the spanning frame. In order to prevent the spanning frame from being damaged during impact, it is necessary to strengthen its structure, and thickened and thickened materials are often used, which makes the weight and volume of the top of the spanning frame and the overall structure increase unnecessarily, which is not only more expensive, but also takes a long time to set up; at the same time, due to the lack of design standard calculations for the energy of the conductor impact during the traditional spanning frame, it is easy to pile up too much material in order to have sufficient impact resistance margin. Later, people began to gradually develop energy-absorbing devices based on spanning frames, which are recorded in Chinese patent publications "CN115395423A" and "CN115324414A". However, these energy-absorbing devices all use elastic energy-absorbing structures, which not only have the problem of poor elastic deformation energy-absorbing performance, but also are prone to elastic fatigue due to their own elastic deformation. In addition, the elastic energy-absorbing structures in actual use are difficult to disassemble, replace, and upgrade due to their own complex structures. Therefore, it is urgent to solve this problem. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a crossing frame with a grid-type shear energy absorption device, which has the advantages of compact structure and easy use. Based on the existing crossing frame, it can effectively improve the crossing frame's ability to resist conductor impact and ultimately prevent the conductors from interfering with the infrastructure under the crossing frame.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A spanning frame with a grid-type shear energy absorbing device comprises a vertical pole, and is characterized in that: it also comprises a shear energy absorbing device, a housing of the shear energy absorbing device is fixed on the vertical pole, and a working end of the shear energy absorbing device is fixed to a predetermined impacted pole section through a pull rope, wherein:

[0006] The shear energy absorption device also includes a core shaft located in the shell and capable of reciprocating sliding motion along the axial direction of the shell, and one end of the core shaft constitutes the working end; a radial guide rail and a slide that can perform radial displacement motion along the radial guide rail are arranged next to the core shaft, and the slide and the core shaft are connected to each other through an energy absorption block that can generate deformation energy absorption motion along the axial direction of the core shaft.

[0007] Preferably, the shell has a cylindrical frame shape, and the core shaft is located on the axis of the shell; the slide and the energy absorbing block that cooperate with each other form a group of energy absorbing units, and the energy absorbing units are more than two groups and are evenly distributed in sequence around the axis of the core shaft.

[0008] Preferably, the shell includes an upper ring body, a lower ring body and a connecting rod axially connecting the upper ring body and the lower ring body; each ring body has spokes extending radially toward the axis of the shell, and a guide hole for the coaxial insertion of the core shaft is provided at the intersection of the spokes on the same ring body; the spokes on the upper ring body and the lower ring body correspond to each other one by one and directional grooves constituting the radial guide rail are recessed at the adjacent surfaces of the spokes, and a guiding matching relationship for generating the radial displacement action is formed between the slide and the directional grooves.

[0009] Preferably, a mounting ear plate is fixed to a section of the shaft body on the core shaft between the upper ring body and the lower ring body, and a matching ear plate is arranged on the slide, and the plate surfaces of the matching mounting ear plate and the matching ear plate are parallel to the axis of the core shaft; positioning pins are protruding from both ear plates, and after the two ends of the energy absorbing block are respectively inserted into the corresponding positioning pins through the positioning holes, the purpose of detachable fastening is achieved by threaded fit or snap fit.

[0010] Preferably, a stop block for limiting the deformation amplitude of the energy absorbing block is arranged on the slide.

[0011] Preferably, a guide key is convexly provided on the core shaft, and a guide groove cooperating with the guide key is concavely provided on the wall of the guide hole.

[0012] Preferably, the energy absorbing block comprises two coplanar end plates for respectively cooperating with the slide and the core shaft, and the adjacent ends of the end plates are connected to each other by two frame rods parallel to each other; the square space enclosed by the frame rods and the end plates constitutes an installation area for installing the energy absorbing grid.

[0013] Preferably, the ends of each frame rod are respectively hinged with the corresponding corner ends of the end plate, and the hinge axis of the hinge is perpendicular to the end plate surface, and one of the hinges is formed by a detachable screw and nut; adjacent ends of the end plates are respectively provided with slots extending toward each other, and the two ends of the energy absorbing grid are respectively snap-fitted with the corresponding slots.

[0014] Preferably, it also includes a front end positioning hoop and a rear end positioning hoop, and the shell is tightened to the vertical pole through the rear end positioning hoop; the front end positioning hoop is tightened to the rod body of the predetermined impacted rod section, and the front end positioning hoop is rotatably matched with a winding roller for retracting and releasing the pull rope, and the winding roller tightens the pull rope by tightening the nut or tightening the pin or the ratchet pawl positioning method.

[0015] Preferably, the energy consumption value calculation method is applied to a spanning frame with a grid-type shear energy absorption device, and is characterized in that:

[0016] The energy consumption value U of a single energy absorbing grid is calculated by the following formula:

[0017] ;

[0018] ;

[0019] Where:

[0020] f y It is the yield stress of the material used for the energy absorbing grid, in MPa;

[0021] a is the length of the energy absorbing grid, in mm;

[0022] t is the thickness of the energy absorbing grid, in mm;

[0023] h is the height of the energy absorbing grid, in mm;

[0024] G is the shear modulus of the material, in MPa;

[0025] v is the Poisson's ratio of the material;

[0026] E is the elastic modulus of the material, in MPa.

[0027] The beneficial effects of the present invention are:

[0028] (1) Through the above scheme, the present invention realizes the assembly design while relying on the axial deformation of the energy absorbing block to cooperate with the radial displacement of the slide to form a specific shear energy absorption structure. Compared with the traditional spring energy absorption unit, the shear energy absorption method is plastic deformation energy absorption, which can absorb more energy. Therefore, it can be designed to be more compact under the condition of absorbing the same energy, and it is also lighter than the traditional spring energy absorption unit. And because of the use of plastic deformation energy absorption, it means that they may be more reliable in long-term or repeated use because they are not prone to failure due to spring fatigue. At the same time, shear energy absorption units can absorb energy and reduce impact in a shorter period of time, which makes them more suitable for applications that require rapid response.

[0029] (2) Another core difference between the present invention and traditional energy absorption methods is that the present invention has stronger adaptability.

[0030] The present invention uses a pull rope to achieve effective connection between the shell and the predetermined impacted rod section, and the pull rope itself has an adjustable length, which makes the present invention adaptable to cross-over frames of different spans and easy to install. It can be installed on the cross-over frame using only traditional scaffolding clamps, etc., which is simple for workers to operate and does not require training, making it more practical.

[0031] (3) The energy absorbing structure of the present invention preferably adopts an energy absorbing grid plate with a grid structure, and is fixed in the slot of the end plate in an easily detachable manner, so as to facilitate replacement or installation of the energy absorbing grid plate.

[0032] Energy absorbing grids are the main energy absorbing and shock absorbing units and can be prefabricated in different sizes in the factory. The larger the size, the stronger the energy absorbing performance. The number of energy absorbing units required can be adjusted according to the needs of the project. In theory, the more the number, the stronger the energy absorbing performance and the stronger the impact resistance of the spanning frame. Specifically, the calculation formula proposed in the present invention can be used to optimize the number to achieve the best balance between cost and performance. In actual work, the purpose of upgrading and replacement can be achieved by replacing the energy absorbing grids.

[0033] (4) The present invention has good energy absorption performance.

[0034] Compared with the traditional shear type damper, the grid form of the energy absorption grid of the present invention is equivalent to adding criss-cross stiffening ribs to the traditional shear type damper. This approach can effectively limit the out-of-plane instability of the web. By reasonably arranging the stiffening ribs, not only the buckling stress of the web can be increased and the out-of-plane instability of the web can be delayed, but also the tensile stress field and the compressive stress field of the web can be redistributed, so that the area of ​​the web entering the yield zone is expanded, and multi-point yield is achieved on the web section, which effectively improves the energy consumption capacity.

[0035] (5) The present invention can achieve energy absorption effectiveness while minimizing costs, thus having a higher cost-effectiveness.

[0036] The present invention provides a calculation formula for energy absorbing grids, so that the energy consumed by a single energy absorbing grid under a certain shear deformation can be accurately calculated. After obtaining the energy consumption capacity of a single energy absorbing grid, the number of energy absorbing grids required to prevent the wires from falling can be conventionally calculated and assembled according to the quality and height of the wires at the construction site. In fact, the maximum number of energy absorbing grids is theoretically infinite, and is only restricted by the production cost. The more energy absorbing grids there are, the stronger the impact resistance is, but the cost will naturally increase. The present invention provides a calculation model to ensure that while clarifying the performance of the energy absorbing grid, the cost is minimized and the cost-effectiveness is ensured, ultimately achieving the effect of saving materials and components, and ultimately achieving the purpose of rapid and cost-effective design of the entire energy absorption system and even the spanning frame structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a usage state diagram of the present invention;

[0038] Figure 2 for Figure 1 A local enlarged view of part I;

[0039] Figure 3 for Figure 1 A partial enlarged view of part II;

[0040] Figure 4 is a schematic diagram of the three-dimensional structure of the shear performance device;

[0041] Figure 5 The figure is a diagram of the matching state of the housing, the slide and the positioning groove;

[0042] Figure 6 This is the matching state diagram of the end plate and the frame rod;

[0043] Figure 7 It is a front view of the energy absorbing grid;

[0044] Figure 8 is a schematic diagram of the three-dimensional structure of the slide;

[0045] Fig. 9 It is a schematic diagram of the three-dimensional structure of the core shaft.

[0046] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0047] 10-shear energy absorption device; 11-housing; 111-upper ring body; 112-lower ring body; 113-connecting rod; 114-spoke; 115-guide hole; 12-mandrel; 121-mounting ear plate; 122-guide key; 13-slide; 131-matching ear plate; 132-stop block; 14-energy absorption block; 141-positioning hole; 142-end plate; 143-frame rod; 144-energy absorption grid; 145-slot; 15-orientation slot;

[0048] 20-pull rope; 30-front end positioning hoop; 40-rear end positioning hoop; 50-winding roller. DETAILED DESCRIPTION

[0049] For ease of understanding, here we combine Figure 1 to Figure 9 The specific structure and working mode of the present invention are further described as follows:

[0050] The present invention is a modification of the traditional span frame, the core part of which is the shear energy absorption device 10 and related configuration components;

[0051] When installing, refer to Figure 1~Figure 3 As shown, the shear energy absorption device 10 is assembled on the vertical pole through the rear end positioning hoop 40, and then matched with the corresponding predetermined impact rod section through the front end positioning hoop 30; once the predetermined impact rod section is subjected to the impact force of the falling wire, the predetermined impact rod section and the surrounding rod body are deformed, driving the pull rope 20 to move and pull the working end of the shell 11, that is, the pulling core shaft 12, so that the energy absorption block 14 is deformed and drives the slide 13 to shift, and finally achieves a shear-type energy absorption and buffering effect. Among them:

[0052] The housing 11 of the shear energy absorption device 10 is preferably made of high-strength aluminum alloy, with a plurality of energy absorption blocks 14 in the middle and a corresponding slide 13 to form an energy absorption unit. The housing 11 is a hollow cylindrical housing 11, and the outer frame is formed by an upper ring body 111, a lower ring body 112, a connecting rod 113 and a spoke 114. Figure 4~Figure 5 As shown. Figure 5 In the embodiment, two spokes 114 corresponding to each other in the axial direction form a pair of rod groups, and there are three rod groups, and the three rod groups are all provided with directional grooves 15; a slide 13 is buckled in the directional groove 15, and the slide 13 can slide back and forth along the directional groove 15. When designing, the slide 13 can also be as follows Figure 8 The rollers are arranged as shown to achieve a rolling sliding effect. A guide hole 115 is provided at the intersection of each spoke 114 of the same ring body, so as to cooperate with the core shaft 12 to achieve a non-rotating guiding sliding effect between the guide key 122 and the guide groove.

[0053] During manufacturing, the housing 11 can be completed by welding in the factory and fastened to the vertical pole of the spanning frame by means of a clamp or the like. There are three slides 13, made of high-strength aluminum alloy, which are rolled in cooperation with the directional groove 15 by rollers. Figure 5 As shown, the slide 13 is provided with a matching ear plate 131, and the matching ear plate 131 and the Fig. 9The positioning pins on the mounting ear plate 121 at the core shaft 12 are matched to achieve the effect of fixing the two ends of the energy absorbing block 14; on the other hand, each slide 13 is also equipped with two stop blocks 132 to prevent the energy absorbing unit from shearing too much and colliding with the slide 13, thereby destroying the slide 13. Since the slide 13 is rollingly matched on the directional groove 15, when the energy absorbing block 14 is sheared, the radial length is shortened, and the slide 13 can slide radially along the circular cross section.

[0054] The energy absorbing block 14 includes end plates 142 at both ends and frame rods 143 connecting the end plates 142. The frame rods 143 and the end plates 142 are hinged parallel to each other and finally enclose a placement area for the energy absorbing grid plate 144 to be placed. Figure 6 and Figure 7 As shown. The four corners of the placement area are equipped with a screw and three pins forming a hinge. When installing the energy absorbing grid 144, remove the screws and the matching nuts to install it; at the same time, the pins and screws at the four corners can ensure that the energy absorbing block can shear as a whole. The energy absorbing block can also use the positioning hole 141 at the end plate 142 to snap into the positioning pins at the slide 13 and the core shaft 12, and then fix it with a buckle to achieve the purpose of convenient disassembly and assembly; the buckle can directly use common accessories on the market, such as convenient buckles.

[0055] In actual use, the installation of the shearing energy absorbing device 10 of the present invention can be completed in advance in the factory. On site, it is only necessary to use bolts to connect the shearing energy absorbing device 10 and the vertical pole through the rear end positioning hoop 40, and then install the winding roller 50 with the front end positioning hoop 30, and then connect the shearing energy absorbing device 10 and the winding roller 50 with the pull rope 20. The positioning and fixing method of the winding roller 50 is relatively common, such as using a conventional fastening nut or fastening pin to locate the position of the winding roller 50, and even using a ratchet pawl mechanism to limit the winding state of the winding roller 50.

[0056] The actual installation steps of the present invention are as follows:

[0057] S1. The factory pre-processes the various parts and the housing 11 and inserts the three slides 13 into the housing 11 along the directional grooves 15 .

[0058] S2. The mandrel 12 is inserted into the housing 11 along the guide hole 115 at the housing 11;

[0059] It should be noted at this time that due to the assembly interference between the mounting ear plate 121 and the guide hole 115, during factory manufacturing, the core shaft 12 should be plugged into the guide holes 115 at both ends of the shell 11 from the inside of the shell 11; then the upper ring body 111 and the connecting rod 113 are welded one by one; the length of the mounting ear plate 121 should be designed to meet the plug-in action, and at the same time, the matching clearance between the guide hole 115 and the core shaft 12 also needs to be properly adjusted to meet the plug-in requirements, which will not be repeated here.

[0060] S3. Insert the energy absorbing grid 144 into the slot 145 of the placement area formed by the end plate 142 and the frame rod 143. After completion, align the four positioning holes 141 at both ends of the energy absorbing block 14 with the positioning pins of the slide 13 and the core shaft 12 respectively, and then insert the buckle into the positioning pin to clamp the energy absorbing block 14 between the slide 13 and the core shaft 12.

[0061] S4. Install the shear energy absorbing device 10, install the pull rope 20 on the working end of the core shaft 12, and wind the pull rope 20 around the winding roller 50 fixed by the front end positioning hoop 30 at the predetermined impact section; at the same time, the shell 11 is also fixed to the corresponding vertical pole through the rear end positioning hoop 40.

[0062] S5. Turn the winding roller 50, and after the pull rope 20 is completely stretched straight, fix the position of the winding roller 50, and the installation is completed.

[0063] The energy absorbing grid 144 is set to be a , Gao Wei h , thickness is t , with five vertical stiffening ribs and five transverse stiffening ribs, which are staggered perpendicularly to each other to form a Figure 7 The energy absorbing grid 144 shown. The length of the small cells divided by each stiffening rib is a x , Gao Wei a y , the uniform thickness of each stiffener is t w ,width b .

[0064] The following calculations and verifications are performed for the energy absorbing grid 144 of the present invention:

[0065] The energy absorbing grid plate 144 required for verification is made of 7A04-T6 aluminum alloy. a =200mm, h =100mm, width-to-thickness ratio: h / t ≤100.

[0066] Since the stop block 132 is added, the maximum deformation degree of the energy absorbing block 14 is limited. Through field experiments, the maximum shear deformation of the energy absorbing block 14 is obtained to be 0.08 rad.

[0067] At this point, it can be known that the energy consumption value U of a single energy absorbing grid plate 144 of the present invention is:

[0068] ;

[0069] Where:

[0070] f yis the yield stress of the material used for the energy absorbing grid plate 144, in MPa; the relevant specifications may be consulted for calculation, and the specific value may be obtained through on-site experiments;

[0071] a is the length of the energy absorbing grid 144, in mm;

[0072] t is the thickness of the energy absorbing grid 144, in mm;

[0073] h is the height of the energy absorbing grid 144, in mm;

[0074] G is the shear modulus of the material, in MPa, and

[0075] ;

[0076] v is the Poisson's ratio of the material; generally 0.25-0.33, the specific value can be obtained through field experiments;

[0077] E It is the elastic modulus of the material, in MPa. When the material is 7A04-T6 aluminum alloy, 70000 MPa is generally used in calculation. The specific value can be obtained through field experiments.

[0078] In order to verify the correctness of the calculation method of the present invention, a total of 7 simulation models of energy absorbing grids 144 with different thicknesses are established here. The material properties are quoted from the article "Testing, modelling and design of 7A04-T6 high-strength thaluminium alloy RHS columns under axial compression". The elastic modulus E is 73.2 GPa, and the yield stress is f y Take 528.75MPa.

[0079] The specific simulation model parameters and calculation results are shown in Table 1:

[0080] Table 1

[0081] ;

[0082] As can be seen from Table 1 above, the calculation results of the energy consumption value formula of a single energy absorbing grid 144 of the present invention have a low deviation rate from the calculation results of the simulation model, and are both within the allowable value range, which is sufficient to prove that the present invention can accurately calculate the energy consumed by a single energy absorbing grid 144 under a certain shear deformation and can meet actual use requirements. After obtaining the energy consumption capacity of a single grid, the conventional data accumulation process can be entered, that is, according to the quality and height of the wires at the construction site, the number of grids required to prevent the wires from falling can be calculated through the conservation of capacity, and then assembled.

[0083] So far, the technical advantages of the present invention are mainly manifested in:

[0084] (1) All parts are prefabricated in the factory, with simple structure and convenient installation, which facilitates the rapid construction of safe and reliable spanning frames;

[0085] (2) The shear energy absorption device 10 is used to absorb energy through plastic deformation, and the grid form has a larger yield area, absorbs more energy, and has strong impact resistance;

[0086] (3) Due to its strong energy absorption performance, the shear energy absorption device 10 of the present invention is smaller in size than the conventional energy absorption device 10, and can be made of aluminum alloy, lead and other materials, making it lighter and more convenient to carry and transport;

[0087] (4) By adopting the assembled solution, the energy absorbing grid 144 can be replaced more conveniently after being impacted. Only the energy absorbing grid 144 needs to be replaced, without replacing all parts.

[0088] (5) Due to the use of plastic deformation to absorb energy, the response is faster and the response to emergencies is more rapid, without considering fatigue failure;

[0089] (6) The material used for the shear energy absorption device 10 of the present invention is not limited to aluminum alloy. In theory, any material that meets the strength requirements can be used. Aluminum alloy is the recommended material.

[0090] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar methods that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description.

[0091] The technical parts not described in detail in the present invention are all well-known technologies.

Claims

1. A spanning frame with a grid-type shear energy absorption device, comprising a vertical pole, characterized in that: It also includes a shear energy absorbing device, the housing (11) of the shear energy absorbing device is fixed on the vertical pole, and the working end of the shear energy absorbing device is fixed to a predetermined impacted pole section via a pull rope (20), wherein: The shear energy absorption device further comprises a core shaft (12) located in the housing (11) and capable of reciprocatingly sliding along the axial direction of the housing (11), one end of the core shaft (12) constituting the working end; a radial guide rail and a slide frame (13) capable of radial displacement along the radial guide rail are arranged beside the core shaft (12), and the slide frame (13) and the core shaft (12) are connected to each other via an energy absorption block (14) capable of generating deformation energy absorption along the axial direction of the core shaft (12); The shell (11) is in the shape of a cylindrical frame, and the core shaft (12) is located on the axis of the shell (11); the slide frame (13) and the energy absorbing block (14) that cooperate with each other form a group of energy absorbing units, and the energy absorbing units are more than two groups and are evenly distributed in sequence around the axis of the core shaft (12); The housing (11) comprises an upper ring body (111), a lower ring body (112) and a connecting rod (113) axially connecting the upper ring body (111) and the lower ring body (112); spokes (114) are radially extended toward the axis of the housing (11), and a guide hole (115) for coaxial insertion of the core shaft (12) is provided at the intersection of the spokes (114) on the same ring body; the spokes (114) on the upper ring body (111) and the lower ring body (112) correspond to each other one by one, and directional grooves (15) constituting the radial guide rail are concavely provided at adjacent surfaces of the spokes (114), and a guiding matching relationship for generating the radial displacement action is formed between the slide frame (13) and the directional grooves (15); A mounting ear plate (121) is fixed to a section of the shaft on the core shaft (12) between the upper ring body (111) and the lower ring body (112), and a matching ear plate (131) is arranged on the slide (13), and the plate surfaces of the matching mounting ear plate (121) and the matching ear plate (131) are parallel to the axis of the core shaft (12); positioning pins are protruding from the two ear plates, and after the two ends of the energy absorbing block (14) are respectively inserted into the corresponding positioning pins through the positioning holes (141), the purpose of detachable fastening is achieved through threaded matching or snap-fitting.

2. The spanning frame with a grid-type shear energy absorption device according to claim 1, characterized in that: A stop block (132) for limiting the deformation amplitude of the energy absorbing block (14) is arranged on the slide frame (13).

3. The spanning frame with a grid-type shear energy absorption device according to claim 1, characterized in that: A guide key (122) is convexly provided on the core shaft (12), and a guide groove cooperating with the guide key is concavely provided on the wall of the guide hole (115).

4. The spanning frame with a grid-type shear energy absorption device according to any one of claims 1 to 3, characterized in that: The energy absorbing block (14) comprises two coplanar end plates (142) for respectively cooperating with the slide (13) and the core shaft (12); adjacent ends of the end plates (142) are connected to each other via two frame rods (143) parallel to each other; a square space enclosed by the frame rods (143) and the end plates (142) constitutes a placement area for installing an energy absorbing grid plate (144).

5. The spanning frame with a grid-type shear energy absorption device according to claim 4 is characterized in that: The ends of each frame rod (143) are respectively hinged with the corresponding corner ends of the end plate (142), and the hinge axis of the hinge is perpendicular to the plate surface of the end plate (142), and one of the hinges is formed by a detachable screw and nut. The adjacent ends of the end plate (142) are respectively provided with slots (145) extending toward each other, and the two ends of the energy absorbing grid plate (144) are respectively snap-fitted with the corresponding slots (145).

6. The spanning frame with a grid-type shear energy absorption device according to any one of claims 1 to 3, characterized in that: The invention also comprises a front end positioning hoop (30) and a rear end positioning hoop (40), wherein the housing (11) is clamped on the vertical pole by the rear end positioning hoop (40); the front end positioning hoop (30) is clamped on the pole body of the predetermined impacted pole section, and a reel (50) for retracting and releasing the pull rope (20) is rotatably matched on the front end positioning hoop (30), and the reel (50) tightens the pull rope (20) by means of a tightening nut or a tightening pin or a ratchet pawl positioning method.

7. A method for calculating energy consumption value, which is applied to the spanning frame with a grid-type shear energy absorption device as claimed in claim 4, characterized in that: The energy consumption value U of a single energy absorbing grid plate (144) is calculated by the following formula: ； ； Where: f y is the yield stress of the material used for the energy absorbing grid (144), in MPa; a is the length of the energy absorbing grid (144), in mm; t is the thickness of the energy absorbing grid (144), in mm; h is the height of the energy absorbing grid (144), in mm; G is the shear modulus of the material, in MPa; v is the Poisson's ratio of the material; E is the elastic modulus of the material, in MPa.

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