Safety net protection frame and installation method thereof

Abstract

The present invention discloses a safety net protection frame and an installation method thereof, comprising a safety net and several steel pipes, characterized in that: one end of the steel pipe is erected on the wall with a variable angle structure with the wall surface, one end of the safety net is fixed to the wall, and the other end is connected to the other end of the steel pipe away from the wall surface. The safety net protection frame of the present invention has a good bearing capacity, and the erection of the protection frame can be simplified by assembling and connecting the steel pipe with the base and the connecting seat with pins, and a buffer elastic member is arranged between the steel pipe and the base to buffer when bearing impact loads, which can avoid problems such as structural fracture caused by rigid connection. The installation method is simple and effective, and is based on the reserved hole construction of the climbing frame, which further simplifies the construction process.

Description

Technical Field

[0001] The invention relates to the technical field related to building construction safety, and in particular to a safety net protection frame and an installation method thereof. Background Art

[0002] When a safety net is used for construction at high altitude, a protective net is installed under or on the side of the building to prevent accidents caused by falling people or objects. For vertically arranged safety nets, the traditional practice is to tie them together with one side of the steel pipe. Due to the strong wind force at high altitudes and the weak impact load resistance, the safety net is prone to deformation and the safety protection level is low. Especially in the case of modern industrialized buildings using external climbing frames, when the climbing frame is lifted, the outer wall at the bottom of the climbing frame has no other protection. If a person or object falls from the climbing frame or falls from the bottom of the climbing frame, it will fall directly to the ground, which is very dangerous. Based on this, a safety net protection frame is designed to protect people or objects when they fall, and can effectively reduce the impact force, protect falling people or objects, and improve safety. Summary of the invention

[0003] The object of the present invention is to provide a safety net protection frame and an installation method thereof to solve the problems raised in the above background technology.

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

[0005] A safety net protection frame comprises: a safety net and a plurality of steel pipes, characterized in that: one end of the steel pipe is erected on the wall with a variable angle structure with the wall surface, one end of the safety net is fixed to the wall, and the other end is connected to the other end of the steel pipe away from the wall surface.

[0006] The connection position between one end of the steel pipe and the wall is lower than the connection position between one end of the safety net and the wall.

[0007] The steel pipe is erected on the wall with one end thereof forming a structure with a changeable angle with the wall surface, and comprises a base and a steel plate. The steel plate is fixed to the wall surface of the wall by anchor bolts, and the base is fixed to the steel plate. An open cavity is arranged in the base, and a buffer elastic part is arranged in the cavity. A through pin hole is arranged on the side of the base, and the steel pipe is provided with a pin hole. A fixing pin is arranged in the pin hole. The fixing pin passes through the pin holes on the base and the steel pipe respectively to realize the rotation connection of the steel pipe in the cavity of the base. A buffer elastic part is arranged between the connection between the steel pipe and the cavity of the base, and the buffer elastic part changes the angle between the steel pipe and the base.

[0008] The steel pipe comprises a main pipe body and a secondary pipe body. The secondary pipe body is sleeved on the bottom of the main pipe body. Corresponding pin holes are arranged on the secondary pipe body and the main pipe body, and are respectively penetrated by fixing pins and rotatably connected with the base.

[0009] The top end of the main pipe body is provided with a pin hole, and the top end of the main pipe body is connected with a connecting seat through a fixing pin.

[0010] The connecting seat is provided with a mounting hole, and the connecting seats corresponding to two adjacent steel pipes are connected by a steel cable, and the other end of the safety net is tied to the steel cable.

[0011] The buffer elastic member is a compression spring.

[0012] A plurality of fixing rings are fixedly arranged on the wall corresponding to the installation position of the safety net. The fixing rings are connected by steel cables, and one end of the safety net is tied to the steel cable.

[0013] A method for installing a safety net protection frame as described above, characterized in that: the installation method is based on the inclined steel pipes that can elastically buffer and set up the safety net, and includes the following steps:

[0014] S1. Generally, the outer wall of the climbing frame construction has through-wall screw holes with a height of about 0.4m-0.6m. The steel plate with the base and the fixing ring are installed at the reserved hole height;

[0015] S2. A connecting seat is installed at one end of the steel pipe through a pin and a pin hole, and the other end is sleeved on the bottom of the main pipe through the auxiliary pipe body, and then connected to the base with a variable angle structure through the pin, the pin hole and the buffer elastic member;

[0016] S3, connecting the corresponding connection seats of two adjacent steel pipes through steel cables;

[0017] S4. Connect one end of the safety net to the fixed ring and tie the other end to the steel cable to achieve horizontal placement of the safety net to form an external wall safety net protection frame.

[0018] In step S4, before the safety net is placed horizontally, it can be placed horizontally only after the climbing frame is lifted.

[0019] Compared with the prior art, the invention has the following beneficial effects: the safety net protection frame of the invention has a good bearing capacity, and the installation of the protection frame can be simplified by assembling and connecting the steel pipe with the base and the pins between the connecting seats, and a buffer elastic member is arranged between the steel pipe and the base to buffer when bearing impact loads, thereby avoiding problems such as structural fracture caused by rigid connection. The installation method is simple and effective, and is based on the reserved hole construction of the climbing frame, which further simplifies the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the connection between the anchor bolt fixing ring and the safety net in the present invention.

[0022] Figure 3 It is a structural schematic diagram of the connection between the steel pipe and the base in the present invention.

[0023] Figure 4 It is a structural schematic diagram of the connection between the steel pipe and the connecting seat in the present invention.

[0024] Figure 5 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0025] Figure 6 This is another reference diagram of the use effect of the overall structure of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0027] See also Figures 1 to 5 A safety net protection frame includes: a safety net 2 and several steel pipes 3, one end of the steel pipe 3 is set on the wall 1 with a variable angle structure with the wall 1, one end of the safety net 2 is fixed on the wall 1, and the other end is connected to the other end of the steel pipe 3 away from the wall.

[0028] The connection position between one end of the steel pipe 3 and the wall 1 is lower than the connection position between one end of the safety net 2 and the wall 1 .

[0029] The steel pipe 3 is erected on the wall 1 at one end thereof with a variable angle structure with the wall 1, and comprises a base 4 and a steel plate 5. The steel plate 5 is fixed to the wall surface of the wall 1 by anchor bolts, and the base 4 is fixed on the steel plate 5. An open cavity is arranged in the base 4, and a buffer elastic member 41 is arranged in the cavity. A through pin hole is arranged on the side of the base 4, and the steel pipe 3 is arranged with a pin hole. A fixing pin 6 is arranged in the pin hole. The fixing pin 6 passes through the pin holes on the base 4 and the steel pipe 3 respectively, so as to realize the rotation connection of the steel pipe 3 in the cavity of the base 4. A buffer elastic member 41 is arranged between the cavity connection of the steel pipe 3 and the base 4, and the buffer elastic member 41 changes the angle between the steel pipe and the base.

[0030] The steel pipe 3 includes a main pipe body 31 and a secondary pipe body 32 . The secondary pipe body 32 is sleeved on the bottom of the main pipe body 31 . Corresponding pin holes are provided on the secondary pipe body 32 and the main pipe body 31 , and are respectively penetrated by fixing pins 6 to be rotatably connected to the base 4 .

[0031] The top of the main pipe body 31 is provided with a pin hole, and the top of the main pipe body 31 is connected to a connecting seat 33 via a fixing pin 6 .

[0032] The connection seat 33 is provided with a mounting hole, and the connection seats 33 corresponding to two adjacent steel pipes 3 are connected by a steel cable 34 , and the other end of the safety net 2 is tied to the steel cable 34 .

[0033] The buffer elastic member 41 is a compression spring, which can be directly welded in the cavity of the base 4 . A compression block is provided at the position of the auxiliary tube body 32 corresponding to the buffer elastic member 41 to achieve good force and pressure with the buffer elastic member 41 .

[0034] The wall 1 is fixedly provided with a plurality of fixing rings 21 corresponding to the installation positions of the safety net 2 . The anchor fixing rings 21 are connected by steel cables 34 , and one end of the safety net 2 is tied to the steel cable 34 .

[0035] A method for installing a safety net protection frame as described above, characterized in that: the installation method is based on the inclined steel pipes that can elastically buffer and set up the safety net, and includes the following steps:

[0036] S1. Generally, the outer wall of the climbing frame construction has through-wall screw holes with a height of about 0.4m-0.6m. The steel plate 5 with the base 4 and the fixing ring 21 are installed at a height of about 0.4m-0.6m at the reserved hole position;

[0037] S2. A connecting seat 33 is installed at one end of the steel pipe 3 through a pin and a pin hole, and the other end is sleeved on the bottom of the main pipe 31 through the auxiliary pipe body 32, and then connected to the base 4 with a variable angle structure through the pin, the pin hole and the buffer elastic member 41;

[0038] S3, connecting the corresponding connection seats 33 of two adjacent steel pipes 3 through a steel cable 34;

[0039] S4. Connect one end of the safety net 2 to the fixing ring 21, and tie the other end to the steel cable 34 to achieve horizontal placement of the safety net 2, forming an external wall safety net protection frame.

[0040] In step S4, before the safety net 2 is placed horizontally, it can be placed horizontally only after the climbing frame is lifted.

[0041] The steel pipe is Thickness 3.0mm, total length of steel pipe 3000mm, inclined steel pipe angle 21 degrees -30 degrees. The connecting screws between steel pipe and steel plate (i.e. the above-mentioned pins) are M16*160, and the through-wall screws are M16*260.

[0042] The safety net protection frame has a good bearing capacity. The installation of the protection frame can be simplified by assembling and connecting the steel pipe with the base and the pins between the connecting seats. The buffer elastic parts are arranged between the steel pipe and the base to buffer when bearing impact loads, which can avoid problems such as structural fracture caused by rigid connection. The installation method is simple and effective, and is based on the reserved holes for climbing frame construction, which further simplifies the construction process.

[0043] Structural verification of the above safety net protection frame:

[0044] 1. Calculation of bearing capacity of inclined steel pipe:

[0045] 1. Check the steel structure design standard "GB 50017-2017" 4.4.1, and you can get the design value of the steel pipe bending strength f = 215N / mm 2 , shear strength design value f v =125N / mm 2 .

[0046] Assuming that a person weighs 65 kg and falls from a height of 10 m onto a safety net, and the impact time is 0.8 s, the impact load is:

[0047]

[0048] The impact load on the safety net is transferred to the wall 1 and the inclined steel pipe 3. The two steel pipes 3 and the two points on the wall 1 form a rectangular safety net 2. Assuming that the load is evenly transferred to the four corner points, the end of an inclined steel pipe 3 is subjected to a vertical pressure of 0.28kN. The horizontal distance between the end of the steel pipe 3 and the steel plate 5 is about 2600mm. The maximum shear force and bending moment of the steel pipe are calculated as:

[0049] V max =0.28kN, M max =0.28×2.6=0.73kN·m

[0050] The steel pipe is erected on the steel plate, which is simplified as a hinged node. Therefore, the load on the steel plate where the steel pipe is erected is:

[0051]

[0052] The shear force at the bolt connected to the steel pipe is: F1 = 4.3-0.28 = 4.02 kN

[0053] 2. According to the steel structure design standard "GB 50005-2017" 6.1.1, the bending bearing capacity is calculated as follows:

[0054]

[0055] Meet the requirements.

[0056] 3. According to Article 6.1.3 of the steel structure design standard "GB 50017-2017", the shear bearing capacity is calculated as follows:

[0057]

[0058] Meet the requirements.

[0059] 4. Therefore, the bearing capacity of the inclined steel pipe 3 meets the design requirements.

[0060] 2. Calculation of bearing capacity of steel plate at bolted joint

[0061] According to Article 4.4.1 of the steel structure design standard GB 50017-2017, the design value of the bending strength of steel plate 5 is f = 215N / mm 2 , shear strength design value f v =125N / mm 2 .

[0062] 1. Bolts pass through two steel plates and steel pipes to fix the steel pipes on the steel plates. From the previous calculations, we know that the maximum shear force and bending moment on the steel plates are:

[0063] M max =2.01×0.18=0.36kN·m;

[0064] 2. According to Article 6.1.3 of the steel structure design standard "GB 50017-2017", the shear bearing capacity is calculated as follows:

[0065]

[0066] Meet the requirements.

[0067] 3. According to the steel structure design standard "GB 50017-2017" 6.1.1, the bending bearing capacity is calculated as follows:

[0068]

[0069] Meet the requirements.

[0070] 4. Therefore, the bearing capacity of the steel plate meets the design requirements.

[0071] 3. Check the bearing capacity of bolts

[0072] The bolt is M16. According to the steel structure design standard GB 50017-2017, 4.4.6, the bolt shear strength design value f can be obtained. v b =140N / mm 2 .

[0073] 1. From the previous calculation, we know that the maximum shear force on the bolt is

[0074] 2. According to Article 11.4.1 of the steel structure design standard GB 50017-2017, the shear bearing capacity of the bolts is calculated as follows:

[0075]

[0076] 3. Therefore, the bearing capacity of the bolts meets the design requirements.

[0077] 4. Check the bearing capacity of anchor bolts

[0078] The steel plate is fixed to the wall 1 by an anchor bolt, which is made of carbon steel with a performance grade of 5.8, an effective diameter of 14.123 mm, and an effective cross-sectional area of ​​156.7 mm 2 According to Article 3.2.3 of the Technical Specification for Rear Anchorage of Concrete Structures (JGJ 145-2013), the standard value of anchor yield strength f can be obtained. yk =400N / mm 2 .

[0079] 1. Assuming that the anchor bolts are uniformly sheared, the shear force at the anchor bolts is 0.5kN. According to Article 6.1.13 of the Technical Code for Post-Anchorage of Concrete Structures (JGJ 145-2013), the shear bearing capacity of the anchor bolts is calculated as follows:

[0080]

[0081] V Rk,s =0.5f yk A s =0.5×400×156.7=31.3kN

[0082]

[0083] Meet the requirements.

[0084] 2. The anchor bolt is subjected to bending moment and tension. According to Article 6.1.1 of the Technical Specification for Post-anchoring of Concrete Structures (JGJ 145-2013), the tensile bearing capacity of the anchor bolt is calculated as follows:

[0085] M max =4.3×0.25-4.02×0.07=0.8kN·m

[0086]

[0087] N Rk,s =f yk A s =400×156.7=62.7kN

[0088]

[0089] Meet the requirements.

[0090] 3. According to Article 6.1.28 of the Technical Specification for Post-Anchorage of Concrete Structures (JGJ 145-2013), the failure bearing capacity of anchor steel under tension-shear combined stress is calculated as follows:

[0091]

[0092] Meet the requirements.

[0093] 4. Therefore, the bearing capacity of the anchor bolts meets the design requirements.

[0094] In summary, the safety net protection frame of the present invention has a good load-bearing capacity. The installation of the protection frame can be simplified by assembling and connecting the steel pipe, the base and the connecting seat with pins. A buffer elastic member 41 is arranged between the steel pipe 3 and the base 4 to provide buffering when subjected to impact loads, thereby avoiding problems such as structural fracture caused by rigid connections.

[0095] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0096] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A safety net protection frame, comprising: A safety net (2) and several steel pipes (3), characterized in that: one end of the steel pipe (3) is arranged on the wall (1) at a variable angle with the wall (1), one end of the safety net (2) is fixed on the wall (1), and the other end is connected to the other end of the steel pipe (3) away from the wall, the connection position of one end of the steel pipe (3) and the wall (1) is lower than the position of one end of the safety net (2) and the wall (1), one end of the steel pipe (3) is arranged on the wall (1) at a variable angle with the wall (1), comprising a base (4) and a steel plate (5), wherein the steel plate (5) is fixed to the wall (1) by anchor bolts. 1), a base (4) is fixed on a steel plate (5), an open cavity is arranged in the base (4), a buffer elastic member (41) is arranged in the cavity, a through pin hole is arranged on the side of the base (4), a steel pipe (3) is arranged with a pin hole, a fixing pin (6) is arranged in the pin hole, the fixing pin (6) respectively passes through the base (4) and the pin hole on the steel pipe (3) to realize the rotation connection of the steel pipe (3) in the cavity of the base (4), a buffer elastic member (41) is arranged between the connection between the steel pipe (3) and the cavity of the base (4), and the buffer elastic member (41) changes the size of the angle between the steel pipe and the base.

2. A safety net protection frame according to claim 1, characterized in that: The steel pipe (3) comprises a main pipe body (31) and a secondary pipe body (32). The secondary pipe body (32) is sleeved on the bottom of the main pipe body (31). Corresponding pin holes are provided on the secondary pipe body (32) and the main pipe body (31), and are respectively penetrated by fixing pins (6) to be rotatably connected with the base (4).

3. A safety net protection frame according to claim 2, characterized in that: The top end of the main pipe body (31) is provided with a pin hole, and the top end of the main pipe body (31) is connected to a connecting seat (33) via a fixing pin (6).

4. A safety net protection frame according to claim 3, characterized in that: The connection seat (33) is provided with a mounting hole, and the connection seats (33) corresponding to two adjacent steel pipes (3) are connected by a steel cable (34), and the other end of the safety net (2) is tied to the steel cable (34).

5. A safety net protection frame according to claim 1, characterized in that: The buffer elastic member (41) is a compression spring.

6. A safety net protection frame according to claim 1, characterized in that: A plurality of fixing rings (21) are fixedly arranged on the wall (1) at the installation position corresponding to the safety net (2); the fixing rings (21) are connected by steel cables (34); and one end of the safety net (2) is tied to the steel cable (34).

7. A method for installing a safety net protection frame according to any one of claims 1 to 6, characterized in that: The installation method is based on the elastic buffering of inclined steel pipes to set up a safety net, and includes the following steps: S1. The outer wall of the climbing frame construction has through-wall screw holes, which are separated by a height of 0.4-0.6 meters. The steel plate (5) with the base (4) and the fixing ring (21) are installed in the reserved holes at the separated heights; S2, a connecting seat (33) is installed at one end of the steel pipe (3) through a pin and a pin hole, and the other end is sleeved on the bottom of the main pipe (31) through the auxiliary pipe body (32), and then connected to the base (4) in a variable angle structure through the pin, the pin hole and the buffer elastic member (41); S3, connecting the corresponding connection seats (33) of two adjacent steel pipes (3) through a steel cable (34); S4. Connect one end of the safety net (2) to the fixing ring (21) and tie the other end to the steel cable (34) to achieve horizontal placement of the safety net (2) to form an external wall safety net protection frame.

8. The method for installing a safety net protection frame according to claim 7, characterized in that: In step S4, before the safety net (2) is placed horizontally, it can only be placed horizontally after the climbing frame is lifted.

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