Device for improving the accuracy of node placement in grid shell structures

Abstract

In the field of grid shell roof structures, we provide a device for improving the accuracy of node placement in grid shell structures. [Solution] The system comprises multiple fixed-side grid shell units 1 and connecting-side grid shell units 2 that are joined together, and multiple tapered-head pins are provided on the side surface of the connecting-side grid shell unit that penetrate the joining surface of the fixed-side grid shell unit. According to this invention, the joining operation of the tapered-head pins can be assisted and accelerated using the fixed-side traction pulley 12 and the movable traction pulley 21, and the tapered-head pins can be prevented from coming out of the pin holes after joining. Furthermore, by using grooves formed on the inner surface of the frame ends of the fixed-side grid shell unit and the connecting-side grid shell unit, and precision positioning keys, high-precision positioning is possible, and the precision positioning key structure can prevent the tapered-head pins from falling out in subsequent processes.

Description

Technical Field

[0001] This invention belongs to the technical field of grid shell roof structures, and particularly relates to a device for improving the node installation accuracy of grid shell structures.

Background Art

[0002] A grid shell roof structure (hereinafter also referred to as a grid shell structure) is a shell-like structure formed by members arranged in a net shape and is a type of space lattice structure. Since the members mainly bear axial forces, it has the feature of high material utilization efficiency. Generally, grid shell structures are classified into forms such as cylindrical shapes, spherical shapes, and twisted curved surface shapes. In large-span buildings, a two-layer grid shell structure is often adopted. This structure is composed by arranging discrete members along a curved surface shape, and has both spatial bearing capacity performance and constructability, and is applied to large-span buildings such as stadiums and exhibition halls. During construction, a general method is to divide the designed grid shell structure into a plurality of unit structures, and sequentially assemble them after transporting them to the construction site. At the time of assembly, a method of connecting a fixed-side grid shell unit already fixed to a support such as a pillar and a connecting-side grid shell unit suspended by a crane with a tapered-head pin is widely used. However, although this method can ensure the general stability and position accuracy after assembly, in a complex grid shell structure, since the tapered-head pin functions as a support member even after connection, as a result of adopting a clearance fit with the pin hole for the purpose of facilitating pin insertion, there is a problem that the installation accuracy after assembly decreases. Therefore, in the node joining of a complex grid shell structure, an auxiliary positioning structure that can realize higher installation accuracy while ensuring stable joining by a tapered-head pin is required.

Summary of the Invention

[0003] The problem that this invention aims to solve is that in conventional devices for improving the installation accuracy of grid shell nodes, tapered-head pins used during the assembly of complex grid shell structures also serve as support functions, making it difficult to ensure sufficient installation accuracy and requiring a separate high-precision positioning member.

[0004] To solve the above problems, the present invention employs the following technical means. Specifically, the device for improving the node installation accuracy of a grid shell structure according to the present invention comprises a plurality of fixed-side grid shell units and connecting-side grid shell units that are joined together, and a plurality of tapered-head pins that penetrate the joining surface of the fixed-side grid shell unit are provided on the side surface of the connecting-side grid shell unit. Fixed-side traction pulleys and movable traction pulleys are provided on the outer surfaces of both ends of the frame of the fixed-side grid shell unit and the outer surfaces of both ends of the frame of the connecting-side grid shell unit, respectively. Furthermore, recessed grooves having a convex cross-section are formed on the inner surfaces of both ends of the frame of the fixed-side grid shell unit and the inner surfaces of both ends of the frame of the connecting-side grid shell unit, respectively, and a hammer-in fitting member for precision positioning (hereinafter referred to as a precision positioning key) is arranged inside the I-shaped groove formed by joining these pair of recessed grooves. Preferably, below the fixed-side traction pulley and the movable traction pulley, positioning blocks are provided that are inserted into the outer surfaces of both ends of the frames of the fixed-side grid shell unit and the connecting-side grid shell unit, respectively. Preferably, the fixed-side traction pulley and the movable-side traction pulley are attached to the outer surfaces of both ends of the frames of the fixed-side grid shell unit and the connecting-side grid shell unit, respectively, via a bolt structure. Preferably, one end of the precision positioning key is tapered. Preferably, a towing rope is stretched around the outer circumference of the fixed towing pulley, and the other end of the towing rope is wrapped around the movable towing pulley. Preferably, both the fixed-side traction pulley and the movable traction pulley are configured as pulleys having an "I"-shaped cross-section. Preferably, the entrance portion of the pin hole on the side surface of the fixed-side grid shell unit is formed as a curved shape.

[0005] Compared to the conventional technology, the advantages of this invention are as follows. According to this invention, the joining operation of the tapered-head pin can be assisted and accelerated using a fixed-side traction pulley and a movable traction pulley, and the tapered-head pin can be prevented from coming out of the pin hole after joining. Furthermore, by using grooves formed on the inner surface of the frame ends of the fixed-side grid shell unit and the connecting-side grid shell unit, and a precision positioning key, high-precision positioning is possible, and the precision positioning key structure prevents the tapered-head pin from falling out in subsequent processes. [Brief explanation of the drawing]

[0006] [Figure 1] Figure 1 is an overall plan view of the device for improving the node placement accuracy of a grid shell structure according to the present invention. [Figure 2] Figure 2 is a cross-sectional view taken along line AA in Figure 1. [Figure 3] Figure 3 is an overall bottom view of the device according to the present invention. [Figure 4] Figure 4 is a structural diagram of the fixed-side grid shell unit of the device according to the present invention. [Figure 5] Figure 5 is an exploded view showing the connection between the fixed traction pulley and the movable traction pulley of the device according to the present invention. [Figure 6] Figure 6 is a structural diagram of the precision positioning key of the device according to the present invention. [Modes for carrying out the invention]

[0007] The present invention will be described in more detail below based on the drawings. As shown in Figures 1, 2, and 4, in the assembly process of a conventional grid shell structure, the connecting side grid shell unit 2 is generally positioned while suspended by a crane in order to quickly connect the fixed side grid shell unit 1, which is fixed to a support column or the like, and the connecting side grid shell unit 2, which is in the process of joining, at a high altitude. To ensure positional accuracy after joining, the side surface of the connecting side grid shell unit 2 is provided with multiple tapered-head pins 11 that penetrate the joining surface of the fixed side grid shell unit 1. Furthermore, to ensure tolerance during joining, the entrance portion of the pin hole on the side surface of the fixed side grid shell unit 1 is curved, specifically, the pin hole entrance portion is formed as a tapered opening with a curved surface. As a result, the tapered-head pins 11 slide along the tapered opening during joining and are smoothly inserted into the pin hole.

[0008] As shown in Figures 1, 2, and 5, in order to quickly move the connecting-side grid shell unit 2 to the vicinity of the fixed-side grid shell unit 1 and to roughly align the tapered-head pin 11 with the pin hole, and to facilitate temporary positioning in subsequent processes (since the tapered-head pin 11 is used as the main alignment connecting pin, it is difficult to ensure high positioning accuracy after joining, and it only functions as temporary positioning), a fixed-side traction pulley 12 and a movable traction pulley 21 are provided on the outer surfaces of both ends of the frame of the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2, respectively. A traction rope 121 is stretched around the outer circumference of the fixed-side traction pulley 12, and the other end of the traction rope 121 is wrapped around the movable traction pulley 21. The fixed-side traction pulley 12 and the movable traction pulley 21 are arranged to be parallel to each other after positioning is complete. Furthermore, to prevent the towing rope 121 from getting caught in the groove of the pulley, both the fixed-side towing pulley 12 and the movable towing pulley 21 are configured as pulleys with an "I" shaped cross-section. When in use, the fixed-side towing pulley 12 and the movable towing pulley 21 are attached to the joining surfaces of the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2, respectively. Typically, one set is installed at each end of the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2 to ensure stability during joining and to facilitate alignment of the tapered-head pin 11 and the pin hole. One end of the towing rope 121 is fixed to the fixed-side towing pulley 12, and the other end is wrapped around the movable towing pulley 21 multiple times. Then, by simultaneously pulling the towing rope 121 at both ends of the fixed-side grid shell unit 1, the connecting-side grid shell unit 2 is stably moved toward the fixed-side grid shell unit 1. This gradually guides the tapered-head pin 11 into the pin hole, completing the joining of both grid shell units. As shown in Figures 2, 3, 4, and 6, in order to achieve high-precision positioning of the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2, recessed grooves 3 having a convex cross-section are formed on the inner surface of the frame ends of both units. A precision positioning key 31 is placed inside the I-shaped groove formed by joining these two recessed grooves 3. One end of the precision positioning key 31 is tapered to ensure a tolerance for fitting into the recessed groove 3. The precision positioning key 31 can be driven in using a soft hammer. The precision positioning key 31 has an I-shaped block structure formed by connecting two convex block sections, and engages with the recessed groove 3 by a hammer-in fitting connection. The number of precision positioning keys 31 used is set according to the dimensions of the joint and the distribution of load points, with the main purpose being to ensure structural stability after joining.

[0009] In implementing this invention, the positioning blocks 13 provided on the bottom surfaces of the fixed-side traction pulley 12 and the movable-side traction pulley 21 are inserted into corresponding recesses formed in the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2, respectively, and fixed by screwing. At this time, it is necessary to position the pulleys so that their rotation directions coincide. One end of the traction rope 121 is wrapped around the fixed-side traction pulley 12, and the other end is wrapped around the bottom surface of the movable-side traction pulley 21 multiple times. Then, by pulling the traction rope 121, the connecting-side grid shell unit 2 is pulled towards the fixed-side grid shell unit 1. As a result, the tapered-head pin 11 on the connecting-side grid shell unit 2 side is gradually inserted into the pin hole of the fixed-side grid shell unit 1, completing the temporary positioning. After the insertion of the tapered-head pin 11 is complete, the tensioned traction rope 121 is tied and fixed to the grid member of the fixed-side grid shell unit 1, and then the precision positioning key 31 is driven into the groove 3 with a soft hammer. If it is necessary to prevent the precision positioning key 31 from falling out, auxiliary fixing with screws may be performed. The precision positioning key 31 also has the function of preventing the tapered head pin 11 from coming out of the pin hole. After fixing is complete, the fixed-side traction pulley 12 and the movable traction pulley 21 are removed, and the assembly process for the connecting-side grid shell unit 2 is started. After the fixed-side grid shell unit 1 and the connecting-side grid shell unit 2 are joined, a block made of the same material as the grid shell and with the same dimensions as the positioning block 13 is fitted into the recess after the positioning block 13 has been removed, and then sealed by screwing it in. This prevents dust and rainwater from accumulating in the recess.

[0010] The above description illustrates the present invention and its embodiments, but its scope of protection is not limited thereto. The drawings also show only one embodiment of the present invention, and actual applications are not limited thereto. In other words, any structural configuration and embodiment similar to the technical means designed by a person skilled in the art, without departing from the spirit of the present invention and without creativity, should all fall within the scope of protection of the present invention. [Explanation of Symbols]

[0011] 1. Fixed-side grid shell unit 11 Tapered head pins 12 Fixed side traction pulley 121 Towing rope 13 Positioning block 2. Connecting side grid shell unit 21 Movable traction pulley 3. Recessed groove 31 Precision positioning keys

Claims

1. The present invention relates to a device for improving the node placement accuracy of a grid shell structure, It comprises a plurality of fixed-side grid shell units (1) and connecting-side grid shell units (2) that are joined together, Multiple tapered-head pins (11) are provided on the side surface of the connecting-side grid shell unit (2), passing through the joining surface of the fixed-side grid shell unit (1). Fixed-side traction pulleys (12) and movable-side traction pulleys (21) are provided on the outer surfaces of both ends of the frame of the fixed-side grid shell unit (1) and the outer surfaces of both ends of the frame of the connecting-side grid shell unit (2), respectively. The inner surfaces of both ends of the frame of the fixed-side grid shell unit (1) and the inner surfaces of both ends of the frame of the connecting-side grid shell unit (2) each have grooves (3) having a convex cross-section. A precision positioning key (31), which is a hammer-in fitting member, is positioned inside the "I" shaped groove formed by the joining of these pair of recessed grooves (3). A device for improving the accuracy of node placement in a grid shell structure, characterized by the following features.

2. Below the fixed-side traction pulley (12) and the movable traction pulley (21), positioning blocks (13) are provided, which are inserted into the outer surfaces of both ends of the frames of the fixed-side grid shell unit (1) and the connecting-side grid shell unit (2), respectively. A device for improving the nodal installation accuracy of a grid shell structure according to claim 1, characterized by the above.

3. The fixed-side traction pulley (12) and the movable traction pulley (21) are attached via a bolt structure to the outer surfaces of both ends of the frames of the fixed-side grid shell unit (1) and the connecting-side grid shell unit (2), respectively. A device for improving the nodal installation accuracy of a grid shell structure according to claim 2, characterized by the above.

4. One end of the precision positioning key (31) is tapered. A device for improving the nodal installation accuracy of a grid shell structure according to claim 1, characterized by the above.

5. A towing rope (121) is stretched around the outer circumference of the fixed towing pulley (12), and the other end of the towing rope (121) is wrapped around the movable towing pulley (21). A device for improving the nodal installation accuracy of a grid shell structure according to claim 1, characterized by the above.

6. Both the fixed-side traction pulley (12) and the movable traction pulley (21) are configured as pulleys having an "I"-shaped cross-section. A device for improving the node placement accuracy of a grid shell structure according to claim 5, characterized by the above.

7. The entrance portion of the pin hole on the side surface of the fixed-side grid shell unit (1) is formed in a curved shape. A device for improving the nodal installation accuracy of a grid shell structure according to claim 1, characterized by the above.

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