A semi-rigid connecting device for reinforcing a bolt ball net rack by an external prestressed steel strand

Abstract

The application relates to the field of buildings and discloses a semi-rigid connecting device of a bolt-sphere net rack reinforced by external prestressed steel strands, which comprises a U-shaped hoop, a flange plate arranged at the upper end of the opening part of the U-shaped hoop, lug ears arranged at the upper part of the flange plate, a connecting block arranged at the middle position of the closed section of the U-shaped hoop and a sealing plate arranged at the lower part of the connecting block. The semi-rigid connecting device of the bolt-sphere net rack reinforced by external prestressed steel strands can effectively improve the bearing capacity of the bolt-sphere net rack and reduce the deflection of the bolt-sphere net rack. The semi-rigid connecting device of the bolt-sphere net rack reinforced by external prestressed steel strands basically does not reduce the net height of the indoor space, has low construction cost, short construction period and simple operation.

Description

TECHNICAL FIELD

[0001] The application relates to the field of buildings, in particular to a semi-rigid connecting device for reinforcing a bolt-sphere net rack by external prestressed steel strands. BACKGROUND

[0002] The net rack structure can be divided into a double-layer plate type net rack structure, a single-layer and double-layer shell type net rack structure. The rod members of the plate type net rack and the double-layer shell type net rack are divided into upper chord rods, lower chord rods and web rods, and mainly bear tension and pressure. At present, most of the net rack structures in China adopt the plate type net rack structure, and the net rack is used in sports stadiums, exhibition centers, auditoriums, cultural facilities, transportation hubs and even industrial plants which require large span and large space. The net rack structure has the advantages of small steel consumption, good integrity and fast production and installation. However, with the development of economy, the requirement for decoration effect is higher and higher, and the existing net rack will inevitably face the problem of increased decoration load during decoration. The increase of the load directly leads to insufficient bearing capacity of the original net rack. The external prestress can effectively change the internal force distribution of the original structure and reduce the stress level of the original structure, but the connection between the prestressed steel strands and the original structure becomes an inevitable technical problem for the external prestressed reinforced net rack. SUMMARY

[0003] In view of the above problems in the prior art, the purpose of the present application is to provide a semi-rigid connecting device for reinforcing a bolt-sphere net rack by external prestressed steel strands.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A semi-rigid connecting device for reinforcing a bolt-sphere net rack by external prestressed steel strands, comprising a U-shaped hoop, a flange plate is arranged at the upper end of the opening part of the U-shaped hoop, a lifting lug is arranged at the upper part of the flange plate, a connecting block is arranged at the middle position of the closed section of the U-shaped hoop, and a sealing plate is arranged at the lower part of the connecting block.

[0006] Further, the flange plate is fixed to the opening part of the U-shaped hoop by a nut matched with the U-shaped hoop.

[0007] Further, a bolt hole is arranged in the middle part of the connecting block, and the connecting block is connected with the lower chord bolt-sphere by a bolt.

[0008] Further, the sealing plate is fixed to the connecting block by a fastening bolt.

[0009] The specific construction process of the semi-rigid connecting device for reinforcing a bolt-sphere net rack by external prestressed steel strands comprises:

[0010] Step one: arrange the steel strand in the middle range of the bolt ball net rack cross section, install the steel strand tensioning end and the prestressed steel strand fixed end, the steel strand passes through the lifting lug hole (the lifting lug and the flange are welded into one on the ground) and moderately tension the steel strand to make it arc-shaped;

[0011] Step two: install the semi-rigid connecting device, fix the connecting block on the bolt ball reference hole of the lower chord with high-strength bolts, pass the U-shaped hoop through the connecting block and fix the sealing plate to prevent the U-shaped hoop from falling, install the two nuts at the lowermost part of the opening end of the U-shaped hoop, then pass the U-shaped hoop through the flange, install the four nuts at the uppermost part of the opening end of the U-shaped hoop, at this time the connecting device and the steel strand have been successfully installed, but the steel strand is in a relaxed state, and the nuts at the opening end of the U-shaped hoop are not tightened;

[0012] Step three: install the support rod, connect the support rod and the lifting lug through bolts, appropriately tension the steel strand to a tight state, adjust the semi-rigid connecting device to the optimal height through the nuts at the opening end of the U-shaped hoop, tighten the nuts at the opening end of the U-shaped hoop and firmly fix the support rod, and tension the steel strand.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] (1) The semi-rigid connecting device for the externally prestressed steel strand reinforced bolt ball net rack can effectively improve the bearing capacity of the bolt ball net rack and reduce the deflection of the bolt ball net rack. On the one hand, when the steel strand is tensioned to the design tension value and is in a working state, an upward lifting force can be effectively generated on the net rack, which is not possessed by the net rack itself, so that the bearing capacity of the net rack is effectively improved. On the other hand, the deflection of the net rack under its own weight is reduced or even offset due to the existence of the lifting force.

[0015] (2) In the semi-rigid connecting device for the externally prestressed steel strand reinforced bolt ball net rack, the installation positions of all parts except the connecting block are located within the height range of the net rack cross section, so that the indoor net height is basically not reduced by using the device.

[0016] (3) The semi-rigid connecting device for the externally prestressed steel strand reinforced bolt ball net rack can avoid difficult high-altitude welding and high-temperature welding of the rod under stress, has low construction cost, short construction period and simple operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0018] Figure 1 isometric view of the semi-rigid connecting device for the externally prestressed steel strand reinforced bolt ball net rack of the present application;

[0019] Figure 2 Split view of the semi-rigid connecting device of the bolted spherical net rack reinforced by the in-situ prestressed steel strand of the present application;

[0020] Figure 3 Layout of the in-situ prestressed steel strand;

[0021] Figure 4 A-A sectional view of Figure 3

[0022] Markings in the figure: ① prestressed steel strand, ② prestressed steel strand tensioning end, ③ prestressed steel strand fixed end, ④ strut, ⑤ semi-rigid connecting device

[0023] 5-1 bolt, 5-2 connecting block, 5-3 U-shaped hoop, 5-4 sealing plate, 5-5 fastening bolt, 5-6 flange, 5-7 lifting lug, 5-8 nut. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These are within the scope of the present application.

[0025] As shown in Figures 1-2 , a semi-rigid connecting device of a bolted spherical net rack reinforced by an in-situ prestressed steel strand, comprising a U-shaped hoop 5-3, a flange 5-6 is arranged at the upper end of the opening part of the U-shaped hoop, and the flange is fixed to the opening part of the U-shaped hoop through a nut 5-8 matched with the U-shaped hoop.

[0026] A lifting lug 5-7 is arranged at the upper part of the flange, a connecting block 5-2 is arranged at the middle position of the closed section of the U-shaped hoop, a sealing plate 5-4 is arranged at the lower part of the connecting block, and the sealing plate is fixed to the connecting block through a fastening bolt 5-5; a bolt hole is arranged at the middle part of the connecting block, and the connecting block is connected with the lower chord bolt ball through a bolt 5-1.

[0027] The components of the semi-rigid connecting device in this embodiment are shown in the table below:

[0028]

[0029] As shown in Figures 3-4 , the specific construction process of the semi-rigid connecting device of the bolted spherical net rack reinforced by the in-situ prestressed steel strand comprises:

[0030] ​Step one: arrange the steel strand 1 in the middle of the bolt ball net frame cross section, install the steel strand tensioning end 2 and the prestressed steel strand fixed end 3, the steel strand passes through the lug hole (the lug and the flange are welded into one on the ground) and moderately tension the steel strand to make it arc-shaped;

[0031] Step two: install the semi-rigid connecting device 5, fix the connecting block 5-2 on the bolt ball reference hole of the lower chord with high-strength bolt 5-1, pass the U-shaped hoop 5-3 through the connecting block and fix the sealing plate 5-4 to prevent the U-shaped hoop from falling, install the two nuts at the lowermost opening end of the U-shaped hoop, then pass the U-shaped hoop through the flange 5-6, install the four nuts 5-8 at the uppermost opening end of the U-shaped hoop, at this time the connecting device and the steel strand have been successfully installed, but the steel strand is in a relaxed state, and the nuts at the opening end of the U-shaped hoop are not tightened;

[0032] Step three: install the support rod 4, connect the support rod and the lug 5-7 through bolts, appropriately tension the steel strand to a tight state, adjust the semi-rigid connecting device to the optimal height through the nuts at the opening end of the U-shaped hoop, tighten the nuts at the opening end of the U-shaped hoop and fix the support rod firmly, and tension the steel strand.

[0033] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various modifications or changes within the scope of the claims, which does not affect the essential content of the present application.

Claims

1. A construction method for a semi-rigid connection device of an externally prestressed steel strand reinforced bolted ball grid frame, characterized in that, The semi-rigid connection device includes a U-shaped hoop, with a flange at the upper end of the opening of the U-shaped hoop, a lifting lug at the upper part of the flange, a connecting block at the middle of the closed section of the U-shaped hoop, and a sealing plate at the lower part of the connecting block. The construction method includes: Step 1: Arrange the steel strands in the middle of the cross-section of the bolt ball grid frame, install the tensioning end of the steel strands and the fixing end of the prestressed steel strands, and pass the steel strands through the lifting lug holes. The lifting lugs and flanges are first welded together, and the steel strands are tensioned appropriately to make them into an arc shape. Step 2: Install the semi-rigid connection device. Fix the connecting block to the reference hole of the lower chord bolt ball with high-strength bolts. Pass the U-shaped hoop through the connecting block and fix the sealing plate to prevent the U-shaped hoop from falling. After installing the two nuts at the bottom of the U-shaped hoop opening end, pass the U-shaped hoop through the flange and install the four nuts at the top of the U-shaped hoop opening end. At this time, the connection device and the steel strand have been successfully installed, but the steel strand is in a loose state and the nuts at the opening end of the U-shaped hoop are not tightened. Step 3: Install the support rod, connect the support rod to the lifting lug with bolts, tension the steel strand to a taut state, adjust the semi-rigid connection device to the optimal height using the nut at the open end of the U-shaped hoop, tighten the nut at the open end of the U-shaped hoop and fix the support rod firmly, and tension the steel strand.

2. The construction method of the semi-rigid connection device for the externally prestressed steel strand reinforced bolted ball grid frame according to claim 1, characterized in that, The flange is fixed to the opening of the U-shaped hoop by a nut that fits into the U-shaped hoop.

3. The construction method of the semi-rigid connection device for the externally prestressed steel strand reinforced bolted ball grid frame according to claim 1, characterized in that, The connecting block has a bolt hole in the middle, and the connecting block is connected to the lower chord bolt ball by bolts.

4. The construction method of the semi-rigid connection device for the externally prestressed steel strand reinforced bolted ball grid frame according to claim 1, characterized in that, The sealing plate is fixed to the connecting block by fastening bolts.

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