JP2506120Y2 - Single layer lattice shell using square steel pipe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a single-layer lattice shell using a square steel pipe developed for large space structures such as multipurpose halls used for sports and entertainment. Is.

[Conventional technology]

Conventionally, as a large space structure, a single-layer truss shell or a three-dimensional truss shell in which a grid of a triangle, a quadrangle, a hexagon, etc. is formed is known, and these shells usually use a circular steel pipe as a constituent member of the grid. At the nodes forming the grid, as shown in FIG. 4, a large number of screw holes 12 for mounting a circular steel pipe 11 are formed in a ball 10 made of cast steel at an angle according to the three-dimensional shape of the shell, and the front end portion is formed in this hole. Joining was performed by using a cast steel ball joint 15 with a bolt 14 attached at its tip after squeezing, a blade plate joint, and other metal fittings of complicated structure.

Further, as shown in FIG. 5, the rectangular steel pipes 16, 17a, 17b are used as the structural members of the truss, and the rectangular steel pipes 16, 17a, 1b are used.
Two planes 18 and 19 orthogonal to each other in the cross section of 7b form an angle of 45 degrees with the horizontal plane, and the horizontal ridge corner portion 20 of one square steel pipe 16
There is known a joint in which the peripheral edge 23 of the joint is welded to form a node 24 so that the horizontal ridge angles 21 and 22 of the other square steel pipes 17a and 17b are butt-joined to each other (Actual exploitation Sho 62-96403). However, there is no one in which each node of the lattice material in the single-layer lattice shell is rigidly joined by such welding.

[Problems to be Solved by the Invention]

The conventional planar space truss has the drawback that the number of nodes and the number of members are large, assembly and processing are complicated, and the weight of the reinforcing bar is significantly increased.To avoid this drawback, when a single-layer truss shell is used, Metallic parts such as cast steel ball joints are expensive when using cast steel ball joints etc. at the nodes of circular steel pipes, and the price of the truss shell is expensive due to the number of uses, and the truss shell is equivalent to the weight of these joints. Since there is a drawback that the structure is heavy as a whole, and since the connection by the ball joint is supported only by the bending rigidity of the bolt with a small diameter and is in a state substantially close to the pin connection, sufficient buckling resistance cannot be expected. As shown in the figure, local buckling is likely to occur at the node 26 of the shell 25, and it is a single-layer truss shell. As shown in Fig. 7, there is a problem that the entire buckling easily spreads and the roof span is limited to 20 to 30 m.

In addition, the conventional joint in which square steel pipes are welded to form nodes is only related to the joint in the truss structure as a beam, and the crossing angle of the square steel pipes, which is the lattice material of the single-layer lattice shell, is three-dimensional, complicated and delicate. Nothing is disclosed about the technical idea of preventing the overall buckling of the shell by welding the nodes that are related to each other at an accurate angle and by making this node a rigid joint, and suggests this. Without it, it was a place that no one could think of until now.

This invention increases the buckling resistance of each node of a rectangular steel pipe and does not cause overall buckling in spite of the single-layer shell structure, and obtains an economical single-layer lattice shell with a light weight and a long span, In particular, it is an object of the present invention to make the installation angle of the lattice material at the node accurate and to facilitate the welding process.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides a reinforcing / mounting plate mounted in front of one mounting plate of a mounting frame formed in a square shape by fillet welding, and a reinforcing / mounting mounted behind this mounting plate. Between the plates, the upper and lower sides of the rectangular steel pipes are joined so as to be parallel to and in line with the upper surface of the grid, and one mounting plate of the mounting frame and each of the reinforcing and mounting plates on both sides provided in front and back. Other right and left rectangular steel pipes, each of which has a notch so that its tip end abuts on the corner, crosses the crossed corners so as to form a straight line in the front and rear of the mounting frame, and the upper surface thereof. Is attached so as to be parallel to the upper surface of the grid, and diagonally abut against the front and rear rectangular steel pipes, and a single-layer lattice shell using a rectangular steel pipe in which the joint edges are fillet-welded to form nodes. And front The central part is a straight line having the width of the rectangular steel pipe, and the left and right sides of the mounting plate are inclined at an angle that matches the curvature of the lattice shell. 2 pairs of reinforcing and mounting plates are brought into contact with each other, and fillet welding is performed to assemble the mounting frame body.
Join each tip of the front and rear rectangular steel pipes in a straight line between a pair of reinforcing and mounting plates, and at the angle of 60 degrees at each corner between the mounting plate and each reinforcing and mounting plate. A means for a single-layer lattice shell using the above-mentioned rectangular steel pipe, in which the respective tip portions of the rectangular steel pipe are joined and the joining peripheral edge is fillet-welded to form nodes, is provided.

[Action]

 The operation of this invention will be described with reference to an embodiment.

As shown in FIG. 1, an upper surface 2 in a cross section of a rectangular steel pipe 1 constituting a grid A of a single-layer lattice shell of the present invention.
Since the nodes 3 are formed in parallel with the grid A surface, the welding length around the joint surface of the rectangular steel pipe 1 at the nodes 3 is larger than that using a ball joint at the tip of the circular steel pipe. Is much longer, the bond is strong and forms a rigid joint, and the buckling strength is significantly increased. Therefore, even though the lattice shell is a single layer, the number of nodes in the lattice is 10
It can have a span of 0 m or more.

Further, the mounting frame body 6 is pre-assembled by fillet welding, and the tips 8a, 8b of the front and rear rectangular steel pipes 1a, 1b are joined between the left and right reinforcing / mounting plates 5a, 5b, 5c, 5d. Since the fillet is welded around the joint edge, welding is easy and the reinforcing and mounting plate 5
a, 5b, 5c, 5d reinforce the abdomen of the rectangular steel pipes 1a, 1b when attaching the oblique rectangular steel pipes 1c, 1d, 1e, 1f to the abdomen of the front and rear rectangular steel pipes 1a, 1b, and also reinforce with the mounting plate 4. Angled rectangular steel pipes 1c, 1d, 1e, 1f between the mounting plates 5a, 5b and 5c, 5d, tips 8c, 8d,
Since 8e and 8f can be accurately cut and joined at an angle that matches the curvature of the lattice shell, the attachment angle can be attached without any error in accuracy, and the welded periphery is fillet welded, so welding is easy and node 3 is used. Accurate and easy to configure.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a single-layer lattice shell using the square steel pipe 1, which is composed of an assembly of triangular grids A, each grid A uses the square steel pipe 1 as a lattice material, The upper surface 2 is arranged so as to be parallel to the surface of the grid A, and the intersecting nodes 3 of the respective lattice members are rigidly joined by welding.

FIGS. 2 and 3 show the details of the node 3. Two pairs of steel plate reinforcements and attachments with the width W of the square steel pipes 1a and 1b are arranged from the front and the back so as to be orthogonal to the steel plate attachment plate 4. Board 5a, 5
The b, 5c, and 5d are arranged in a straight line and abutted in a square shape when viewed from above, and the joining peripheral edge thereof is fillet welded to assemble the mounting frame body 6 in advance.

When viewed from the front, the mounting plate 4 has a width W of the rectangular steel plate 1a in the central portion.
It has a linear shape having a length of and the left and right sides 7a and 7b are inclined at an angle that matches the curvature of the lattice shell.

To form the lattice shell, the front and rear rectangular steel pipes 1a, 1b
Install the tip parts 8a, 8b of the left and right between the reinforcing and mounting plates 5a, 5b and
5c and 5d are joined so as to fit in between them, and the peripheral edge of the joint is fillet welded, and then the mounting plate 4 and the reinforcing and mounting plates 5a, 5b, 5
Angled rectangular steel pipes 1c, 1d, 1 at the outward corners formed by c, 5d
Seeing the tips 8c, 8d, 8e, 8f of e, 1f with the rectangular steel pipes 1a, 1b in a plane
Mounting plate 4 so as to form an angle of 60 degrees and when viewed from the side
The left and right sides 7a, 7b are abutted at an angle corresponding to the inclination, and the joining peripheral edge is fillet welded.

Reference numeral 9 is an oblique rectangular steel pipe 1c, 1d, 1e, 1f inside the rectangular steel pipe 1a, 1b.
It is a partition wall provided near the intersection of the outer edge of and the reinforcing / mounting plates 5a, 5b, 5c, 5d, and can be mounted for reinforcement as required.

[Advantage of the Invention] In the invention of claim 1, since all the intersecting nodes of the rectangular steel pipe which is the lattice material of the single-layer lattice shell are rigidly joined by welding, the buckling strength of each node is the node by the conventional pin joint. Although it is significantly larger than the conventional single-layer lattice shell, it does not buckle as a whole, has a much longer span than before, and does not use heavy cast steel ball joints. Due to the increased flexural strength, it is possible to use a member with a smaller cross-sectional area of the lattice material, so it is possible to reduce the weight of the entire lattice shell,
An economical single layer lattice shell that can be constructed at low cost is obtained.

In addition, since the mounting frame is formed in a square shape, the nodes can be easily and accurately manufactured by fillet welding, and the square steel pipe that is the lattice material can be mounted without error, and the upper surface of the lattice steel pipe of the lattice material is Since it is made parallel to the top surface of the grid, the cross section of the rectangular steel pipe is
Since the structure of the mounting frame is simpler than that of the flexible one, the manufacturing is easy, and the mounting and welding work of the square steel pipe which is the lattice material is easy.

According to a second aspect of the present invention, a central portion of the front surface is a straight line having a width equal to the width of a rectangular steel pipe, and the left and right sides of the mounting plate are inclined at an angle matching the curvature of the lattice shell. Since two pairs of reinforcing and mounting plates are brought into contact with each other at the same intervals as the width and fillet welded to assemble the mounting frame, the roof of the single-layer lattice shell has a hemispherical shape with an appropriate inclination angle. Is very easy to assemble, and the corners between the mounting plate of the mounting frame and each of the reinforcing and mounting plates are joined to each other at each 60 ° angle, and the ends of each rectangular steel pipe are joined together. Since the fillets were welded to each other, the unit grid forms an equilateral triangle, so that the single-layer lattice shell roof can be assembled accurately and easily.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view, FIG. 2 is an enlarged plan view of a node portion, FIG. 3 is a front view thereof, and FIGS. Figure 7 shows a conventional example,
FIG. 4 is a front view showing the right half in section, FIG. 5 is a plan view, and FIGS. 6 and 7 are explanatory views. 1,1a, 1b, 1c, 1d, 1e, 1f …… Square steel pipe, 2 …… Top surface, 3…
… Nodal points, 4 …… Mounting plate, 5a, 5b, 5c, 5d …… Reinforcing and mounting plate, 6 …… Mounting frame, 7a, 7b …… Left, right, 8a, 8b, 8c,
8d, 8e, 8f …… Tip, A …… Grid, W …… Width.

Claims (2)

(57) [Scope of utility model registration request] 1. Reinforcing and mounting plates (5a), (5b) mounted in front of one mounting plate (4) of a mounting body (6) formed in a square shape by fillet welding, and this mounting plate (4). Between the reinforcing and mounting plates (5c) and (5d) attached to the rear of (), the upper surfaces (2) of the front and rear rectangular steel pipes (1a) and (1b) are parallel to the upper surface of the grid (A), and a straight line is formed. Reinforcing and mounting plates (5a), (5b) on both sides of the mounting frame (6) and one mounting plate (4) of the mounting frame (6)
(5c), (5d) and the outside of the corner, the tip (8c), (8d), (8e), and (8f) are cut out so as to abut the corner. The other left and right rectangular steel pipes (1c), (1d), (1e) and (1f) are aligned so as to form a straight line before and after the mounting frame (6), and the upper surface (2) of the grid (A). Attached so that it is parallel to the upper surface of the above, and obliquely abutted against the front and rear rectangular steel pipes (1a), (1b), and their joint peripheral edges are fillet-welded to form the nodes (3). Single layer lattice shell using steel pipe. 2. A mounting plate in which a central portion of the front surface is a straight line having a width (W) of a rectangular steel pipe (1), and its left and right (7a), (7b) are inclined at an angle matching the curvature of the lattice shell. In (4), two pairs of reinforcing and mounting plates (5a), (5b) and (5c), (5d) are arranged at the same interval as the width (W) of the rectangular steel pipe (1) so as to be orthogonal to this, from the front and back. ) Are contacted with each other and fillet welded to assemble the mounting frame body (6), and the front and rear rectangular steel pipes (1a) are provided between the front and rear two pairs of the reinforcing and mounting plates (5a), (5b) and (5c), (5d). ), (1b) are joined together so that they are aligned with each other (8a), (8b), and the mounting plate (4) and the reinforcing and mounting plates (5a), (5c) and (5)
b), each corner of each square steel pipe (1c), (1e), (1d), (1f) at each corner of 60 degrees in the corner between (5d), (8c),
The single-layer lattice shell using a square steel pipe according to claim 1, wherein (8e), (8d), and (8f) are joined, and the joining peripheral edge is fillet-welded to form a node (3).