Fall-prevention device for steel grid and Anti-fall steel grid

Abstract

Provided in the present invention are a fall-prevention device for a steel grid and an anti-fall steel grid. The steel grid comprises a support column and a grid body, wherein a steel grid bearing is mounted at the top of the support column, and the grid body comprises a bearing spherical joint and grid members and is welded to the steel grid bearing via the bearing spherical joint. The fall-prevention device comprises: a column sleeve, which is sleeved and fixed onto the column body at the top of the support column; a bearing spherical joint box, which is sleeved on the bearing spherical joint and also sleeved on several grid members; and at least one tension cable, one end thereof being connected and fixed to the column sleeve, and the other end being connected and fixed to the bearing spherical joint box. When the steel grid bearing detaches from the support column, the tension cable pulls the grid body via the bearing spherical joint box to prevent the grid body from falling. The present invention can prevent the risk of the steel grid falling and causing personnel injuries, ensure the structural safety of the steel grid structure under accidental conditions, and safeguard the safety of personnel and property.

Description

A fall protection device for a steel space frame, and a fall-proof steel space frame.

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202510069496.6, filed on January 16, 2025, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of building safety technology, specifically to a fall protection device for a steel space frame and a fall protection steel space frame. Background Technology

[0004] Steel space frame structures are mesh-like structural systems composed of many members arranged according to certain rules. They are characterized by light weight, large span, good structural stability, and fast construction speed. They are widely used in large public buildings such as stadiums, exhibition halls, and airport terminals. The design and construction of steel space frame structures must strictly comply with relevant national and industry standards to ensure the safety and functionality of the structure.

[0005] In recent years, due to illegal and irregular repairs and construction, corrosion of steel space frame members, nodes and supports, and insufficient load-bearing capacity of support members, there have been many safety incidents where the supports of steel space frame structures were pulled off and the entire steel space frame fell to the ground, causing casualties and large-scale economic losses.

[0006] It is evident that current technologies pose significant safety risks, and the safety of steel space frames should be given sufficient attention. Even in the event of a collapse, the principle of prioritizing life should be upheld to ensure that no casualties occur. Summary of the Invention

[0007] In view of the shortcomings of existing technology and the technical drawbacks of frequent falls from steel space frame structure supports, this invention designs a fall prevention device for steel space frames, which can eliminate the risk of injury from falling steel space frame structure supports and ensure the structural safety of steel space frame structures under accidental factors.

[0008] The technical solution of the present invention is as follows:

[0009] This invention first provides a fall protection device for a steel space frame, wherein the steel space frame includes supporting columns and a space frame body, a steel space frame support is installed at the top of the supporting columns, the space frame body includes a support ball joint and space frame members connected to the support ball joint, and the space frame body is welded to the steel space frame support via the support ball joint. The fall protection device includes:

[0010] Column sleeve clamp, wherein the column sleeve clamp is fitted and fixed to the column body at the top of the supporting column;

[0011] A ball joint box for bearings, wherein the ball joint box is fitted onto the ball joint and also onto several of the space frame members of the ball joint;

[0012] At least one pull rope, one end of which is connected and fixed to the column sleeve hoop, and the other end of which is connected and fixed to the support ball joint box;

[0013] When the steel space frame support detaches from the support column, the pull rope pulls the space frame body through the ball joint box of the support to prevent it from falling.

[0014] In some preferred embodiments, the column sleeve is formed by welding steel plates together from all four sides and is sleeved on the column body at the top of the support column; and, at least one of the steel plates has a bolt rod welded on its outer side wall, or at least one of the steel plates has a pre-set through hole through which a bolt rod passes, and the bolt rod passes into the support column for connecting and fixing the pull rope.

[0015] In some preferred embodiments, the bolt rods are symmetrically arranged on the two opposite steel plates of the column sleeve, and the pull ropes include two ropes, which are respectively connected to the bolt rods and the support ball joint box.

[0016] In some preferred embodiments, the support ball node box is formed by welding steel plates around and on the top, and is fitted onto the support ball node. The steel plates around the ball node have pre-drilled through holes corresponding to the space frame members, and are fitted onto the corresponding space frame members.

[0017] In some preferred embodiments, the steel plate corresponding to the space frame member on all four sides is composed of two half steel plates. Each half steel plate has a semi-circular hole pre-set in the center. When the two half steel plates are joined together, the two semi-circular holes form a through hole, which is fitted onto the corresponding space frame member.

[0018] In some preferred embodiments, the top steel plate is welded to and fixed with ear plates, which are provided with through holes for connecting and fixing the pull rope by means of connecting bolts.

[0019] In some preferred embodiments, the ear plates include two symmetrically arranged plates for symmetrically connecting and fixing the two pull ropes.

[0020] In some preferred embodiments, end plates are provided at both ends of the pull rope, and through holes are provided on the end plates.

[0021] In some preferred embodiments, both the column sleeve clamp and the support ball joint box are welded together on site.

[0022] The present invention also provides a fall-prevention steel grid frame, which is equipped with the aforementioned fall-prevention device for the steel grid frame.

[0023] The advantages of this invention compared to the prior art are: this invention provides a fall protection device for steel space frames, overcoming the shortcomings of the prior art, preventing the steel space frame structure from falling or collapsing, thereby ensuring the safety of personnel and property. Specific advantages include at least one or more of the following:

[0024] (1) The anti-fall device provided by the present invention will automatically enter the working state immediately when an accidental event causes the support of the steel space frame structure to be damaged and fall, and pull the steel space frame to prevent it from falling.

[0025] (2) The fall prevention device provided by the present invention uses high toughness material for the pull rope. Multiple pull ropes can be set according to the actual situation. When it enters the working state, the tensile load can bear the weight of the entire steel grid frame, ensuring that the device plays its intended role.

[0026] (3) The anti-fall device provided by the present invention connects the steel grid body through the design of the support ball node box, ensuring a firm and stable connection and ensuring that the steel grid will not fall off the device in the event of an accident.

[0027] (4) The anti-fall device provided by the present invention uses steel plates to weld the column sleeve hoop and the support ball node box on site. It is simple and convenient to install and can adapt to different types of support columns and steel grid bodies.

[0028] (5) The fall protection device provided by the present invention has a simple structural design and is easy to promote and use.

[0029] It should be understood that the implementation of any embodiment of the present invention does not mean that it will simultaneously possess or achieve multiple or all of the above-mentioned beneficial effects. Attached Figure Description

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0032] Figure 1 is a schematic diagram of the steel space frame structure in the background art of this invention;

[0033] Figure 2 is an enlarged schematic diagram of the steel space frame structure in the background art of this invention;

[0034] Figure 3 is a schematic diagram of the stress situation of the steel space frame support in the background art of the present invention;

[0035] Figure 4 is an enlarged schematic diagram of the stress situation of the steel space frame support in the background art of the present invention;

[0036] Figure 5 is a schematic diagram of the installation of a fall prevention device for a steel space frame according to an embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of a fall protection device for a steel space frame according to an embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the normal state of a steel space frame anti-fall device according to an embodiment of the present invention;

[0039] Figure 8 is a schematic diagram of the working state of a steel space frame anti-fall device according to an embodiment of the present invention;

[0040] Figure 9 is a schematic diagram of a column sleeve hoop structure according to an embodiment of the present invention;

[0041] Figure 10 is a schematic diagram of the support ball node box structure according to an embodiment of the present invention;

[0042] Figure 11 is a schematic diagram of the connection between the steel plate of the support ball joint box and the rod in an embodiment of the present invention;

[0043] Figure 12 is a schematic diagram of a rope structure according to an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Steel space frame; 101. Support column; 102. Steel space frame support; 103. Support ball joint; 104. Space frame member; 105. General ball joint;

[0046] 200. Fall arrestor; 201. Column sleeve clamp; 201a. Bolt rod; 201b. Nut; 202. Support ball joint box; 202a. Ear plate; 202b. Connecting bolt; 203. Pull rope; 203a. End plate.

[0047] The same or corresponding marks in the diagram indicate the same or corresponding parts. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0051] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] A typical steel space frame structure is shown in Figure 1, and the connection near the supports of the steel space frame structure is shown in Figure 2. The members are connected by ball joints, which are divided into general ball joints and support ball joints. The support ball joints are fixed to the supports, and the supports are then fixed to the supporting columns, thus forming a stable structure.

[0054] Structural mechanics calculations, as shown in Figures 3 and 4, reveal that when the steel space frame structure bears various roof loads, it exerts a downward vertical pressure N and an inward horizontal tension T on the supports. The inward horizontal tension T can pull the supports off the supporting columns, causing the steel space frame to collapse. Current methods involve fixing the supports to the supporting columns using welding or bolting connections, and through structural design, ensuring that the load-bearing capacity of the support connections exceeds the inward horizontal tension T, thereby preventing the steel space frame from collapsing.

[0055] However, although structural design ensures that steel space frame structures will not experience support failure or collapse in most cases, unforeseen circumstances can still occur, causing the supports to detach from the supporting columns, leading to the entire steel space frame structure collapsing and resulting in loss of life and property. Accidents caused by the collapse of steel space frame structure supports are all too common.

[0056] In view of this, the present invention designs a fall protection device for steel space frame, which can avoid the risk of steel space frame structure collapse and injury caused by the falling of the support of the steel space frame structure, and ensure the structural safety of the steel space frame structure under accidental factors.

[0057] The implementation of the present invention will be described in detail below with reference to preferred embodiments.

[0058] A steel space frame structure is a mesh-like structural system composed of many members arranged according to certain rules. It features lightweight construction, large span, good structural stability, and fast construction speed. The steel space frame 100 structure shown in Figure 1 is a typical steel space frame structure used in practice, widely applied in large public buildings such as stadiums, exhibition halls, and airport terminals. Figure 2 shows the connection near the steel space frame support 102. The space frame members 104 are connected by ball joints, which are divided into general ball joints 105 and support ball joints 103. The support ball joints 103 are connected and fixed to the steel space frame support 102, which in turn is connected and fixed to the supporting column 101, thus forming a stable structure. As shown in Figures 3 and 4, in practice, when the steel space frame 100 structure bears various loads from the roof, it applies a downward vertical pressure N and an inward horizontal tension T to the steel space frame support 102. The inward horizontal tension T will pull the steel space frame support 102 off the support column 101, causing the steel space frame 100 to fall.

[0059] Referring to Figure 2, the steel space frame 100 includes support columns 101 and a space frame body. A steel space frame support 102 is mounted on the top of the support columns 101. In some embodiments, to increase stability, the steel space frame support 102 is welded to the top of the support columns 101. The space frame body includes support ball joints 103 and space frame members 104 connected to the support ball joints 103. The space frame members 104 intersect at the support ball joints 103 and conventional ball joints 105, forming a cross-network structure. The space frame body is welded to the steel space frame support 102 via the support ball joints 103. The steel space frame support 102 mainly serves to support the space frame body and transfer the weight load of the space frame body to the support columns 101.

[0060] The anti-fall device 200 for the steel space frame 100 provided by the present invention, as shown in Figures 5 to 7, mainly includes: column sleeve hoop 201, support ball joint box 202 and at least one pull rope 203.

[0061] Specifically, the column sleeve 201 is fitted and fixed to the top of the supporting column 101, and the support ball joint box 202 is fitted onto the support ball joint 103, and simultaneously fitted onto several space frame members 104 of the support ball joint 103. One end of the pull rope 203 is connected and fixed to the column sleeve 201, and the other end is connected and fixed to the support ball joint box 202. When the steel space frame support 102 detaches from the supporting column 101, the pull rope 203 pulls the space frame body through the support ball joint box 202 to prevent it from falling, thereby improving the safety of the steel space frame structure and ensuring the safety of personnel and property.

[0062] Referring again to Figures 5 through 9, to more securely connect and fix the column sleeve 201 to the steel space frame 100 and install it on the already assembled steel space frame 100 structure, the column sleeve 201 is welded on-site. The column sleeve 201 is formed by welding steel plates together from all four sides. That is, according to the dimensions of the column and considering the load-bearing capacity, the steel plates are pre-cut to the required size, and then the construction workers weld the steel plates tightly against the perimeter of the column. After welding, the column sleeve 201 is fitted onto the top of the supporting column 101.

[0063] In some embodiments, if the support column 101 is a square column, the welded column sleeve 201 will be U-shaped. It should be noted that the shape of the welded column sleeve 201 matches the shape of the support column 101. For example, when the column is cylindrical, the welded column sleeve 201 forms a ring enclosing the column. In the event of an accident, the column sleeve 201 acts as a fixing node, preventing the steel space frame 100 from collapsing.

[0064] At least one of the outer side walls of the welded column sleeve 201 is welded with a bolt rod 201a, or at least one of the steel plates is pre-drilled with a through hole through which the bolt rod 201a is inserted for connecting and fixing the pull rope 203. The bolt rod 201a can be further inserted into the support column 101 for connecting and fixing the pull rope 203 to enhance the connection strength of the bolt rod 201a.

[0065] In some embodiments, end plates 203a are provided at both ends of the pull rope 203. After the end plates 203a are sleeved on the bolt rod 201a, the nuts 201b are tightened to fix them, thereby achieving a stable connection between the column sleeve clamp 201 and the pull rope 203.

[0066] In some embodiments, since the support column 101 is a square column, the column sleeve 201, after being welded together, forms a U-shape. Bolt rods 201a are symmetrically arranged on the two steel plates opposite the U-shaped sides of the column sleeve 201. Meanwhile, in order to increase the tensile load of the fall arrestor 200, the pull rope 203 includes two ropes, with both ends connected to the bolt rods 201a on the column sleeve 201 and the support ball joint box 202, respectively.

[0067] Referring to Figures 2, 5, 6, 10, and 11, the support ball joint box 202 is also welded on-site. The steel plate is pre-cut according to the size of the support ball joint 103. The support ball joint box 202 is formed by welding the steel plate from all sides and the top, and is fitted onto the support ball joint 103. The steel plates corresponding to the space frame members 104 have pre-set through holes on all sides, and are fitted onto the corresponding space frame members 104. It should be noted that, as shown in Figure 11, the steel plates corresponding to the space frame members 104 are composed of two and a half steel plates. Each half steel plate has a pre-set semi-circular hole in its center. When the two half steel plates are joined, the two semi-circular holes form a through hole, fitting onto the corresponding space frame member 104. Both half steel plates and their pre-set semi-circular holes are pre-cut and designed according to the dimensions of the support ball joint 103 and the space frame member 104.

[0068] In some embodiments, the welded support ball joint box 202 has a cubic structure, as shown in Figures 5 and 10. The steel plates on the three sides of the cube are all welded from two and a half steel plates to ensure that they can be fitted onto the space frame members 104 on the steel space frame. Each of the two half steel plates has a pre-set semi-circular hole in its center. When the two half steel plates are joined together, the two semi-circular holes form a through hole, and are spliced ​​into a square steel plate. The space frame members 104 of the steel space frame 100 pass through the through hole. This design ensures a stable connection between the support ball joint box 202 and the support ball joint 103 of the steel space frame 100. In the event of an accident, the pull rope 203 can pull the steel space frame 100 through the support ball joint box 202 to prevent it from falling.

[0069] Referring again to Figures 5 and 10, in some embodiments, a pair of ear plates 202a are welded to the steel plate at the top of the support ball joint box 202. The ear plates 202a are two in number and symmetrically arranged for symmetrically connecting and fixing the two pull ropes 203. The ear plates 202a are provided with through holes for connecting and fixing the end plates 203a of the pull ropes 203 using connecting bolts 202b.

[0070] Referring to Figures 5 and 12, the pull rope 203 is made of a high-strength, high-toughness, flexible material, such as steel strand. Each end of the pull rope 203 has a circular end plate 203a with a through hole. The through holes on the end plate 203a and the ear plate 202a are connected and fixed using connecting bolts 202b, forming a fixed connection between the pull rope 203 and the support ball joint box 202. The through hole on the other end plate 203a is fitted onto the bolt rod 201a of the column sleeve clamp 201, forming a fixed connection between the pull rope 203 and the column sleeve clamp 201.

[0071] Under the condition of steel space frame support 102 falling, the design calculation formula for the cross-sectional area A of the high-strength, high-toughness tension rope is as follows:

[0072] In the formula: μ is the dynamic load coefficient, F is the load value within the influence range of the device, and [σ] is the allowable stress value of the rope material.

[0073] It should be noted that, depending on the load-bearing requirements, multiple pull ropes 203 can be installed, and multiple bolt rods 201a and multiple ear plates 202a can be connected to them accordingly.

[0074] The working principle of this invention is as follows:

[0075] Referring again to Figure 7, which shows the normal state of the fall arrestor 200 of the present invention:

[0076] (1) The column sleeve 201 is fixed at the top of the support column 101;

[0077] (2) Weld the cut steel plate at the position of the support ball node 103 to form the support ball node box 202;

[0078] (3) By bolt connection, the end plate 203a of one end of the pull rope 203 is connected to the column sleeve hoop 201, and the end plate 203a of the other end is connected to the support ball node box 202.

[0079] Referring again to Figure 8, Figure 8 shows the working state of the fall arrestor 200 of the present invention:

[0080] In the event of an accidental event causing the steel space frame support 102 to break and fall, the fall arrestor 200 will automatically activate. The fall arrestor 200 will effectively limit the fall of the steel space frame 100 structure, protecting personnel and property below it from damage. It should be noted that the material used for the guy rope 203 should be high-strength and high-toughness, and the dimensions of the device must be designed and calculated to ensure that the device functions as intended.

[0081] The specific design and installation steps of this invention are as follows:

[0082] (1) Based on the current status of the steel space frame 100, design the drawings for the fall protection device 200 and determine the dimensions of the steel plate;

[0083] (2) Cut the steel plates according to the design drawings;

[0084] (3) According to the design, the steel plate structure that can be welded in advance is welded in the factory to reduce the amount of on-site welding work;

[0085] (4) On site, the column sleeve hoop 201 and the support ball node box 202 are spliced ​​and welded firmly;

[0086] (5) Connect the welded column sleeve hoop 201 and the support ball node box 202 with a pull rope 203.

[0087] The present invention also includes a fall-prevention steel grid frame, which is equipped with the fall-prevention device of the aforementioned steel grid frame.

[0088] It will be readily understood by those skilled in the art that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fall arrestor for a steel space frame, the steel space frame comprising support columns and a space frame body, a steel space frame support mounted on the top of the support columns, the space frame body comprising a support ball joint and space frame members connected to the support ball joint, the space frame body being welded to the steel space frame support via the support ball joint, characterized in that, The fall protection device includes: Column sleeve clamp, wherein the column sleeve clamp is fitted and fixed to the column body at the top of the supporting column; A ball joint box for bearings, wherein the ball joint box is fitted onto the ball joint and also onto several of the space frame members of the ball joint; At least one pull rope, one end of which is connected and fixed to the column sleeve hoop, and the other end of which is connected and fixed to the support ball joint box; When the steel space frame support detaches from the support column, the pull rope pulls the space frame body through the ball joint box of the support to prevent it from falling.

2. The anti-fall device for the steel space frame according to claim 1, characterized in that, The column sleeve is formed by welding steel plates from all four sides and is sleeved on the top of the support column. At least one of the steel plates has a bolt rod welded to its outer side wall, or at least one of the steel plates has a pre-set through hole through which a bolt rod passes, and the bolt rod passes into the support column to connect and fix the pull rope.

3. The anti-fall device for the steel space frame according to claim 2, characterized in that, The bolt rods are symmetrically arranged on the two opposite steel plates of the column sleeve. The pull ropes include two ropes, which are respectively connected to the bolt rods and the support ball joint box.

4. The anti-fall device for the steel space frame according to claim 1, characterized in that, The support ball node box is formed by welding steel plates from all sides and top, and is fitted onto the support ball node. The steel plates corresponding to the space frame members have pre-drilled through holes on all sides and are fitted onto the corresponding space frame members.

5. The anti-fall device for the steel space frame according to claim 4, characterized in that, The steel plates corresponding to the space frame members around the perimeter are composed of two and a half steel plates. Each of the two and a half steel plates has a semi-circular hole pre-set in the center. When the two and a half steel plates are joined together, the two semi-circular holes form a through hole, which is then fitted onto the corresponding space frame member.

6. The anti-fall device for the steel space frame according to claim 4, characterized in that, The top steel plate is welded and fixed with ear plates, which are provided with through holes for connecting and fixing the pull rope by means of connecting bolts.

7. The anti-fall device for the steel space frame according to claim 6, characterized in that, The ear plate comprises two symmetrically arranged plates for symmetrically connecting and fixing the two pull ropes.

8. The anti-fall device for a steel space frame according to any one of claims 1-7, characterized in that, The pull rope is provided with end plates at both ends, and the end plates are provided with through holes.

9. The anti-fall device for a steel space frame according to any one of claims 1-7, characterized in that, Both the column sleeve and the support ball joint box are welded on site.

10. A fall-prevention steel space frame, characterized in that, The steel space frame is equipped with a fall protection device as described in any one of claims 1-9.

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