JPH0517349B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> This invention relates to a method for constructing a cable truss type roof structure.

<<Background of the Invention>> Steel truss structures or air membrane structures have been known as large roof structures for large space structures such as baseball stadiums.

However, each of these structures had the following drawbacks.

That is, in a steel truss structure, the weight of the truss is heavy, and the temporary equipment required for erection is large-scale, increasing construction costs.

On the other hand, with an air membrane structure, the entire structure needs to be airtight, which requires a special structure for the entrance and exit, and in order to support the roof of the air membrane,
The disadvantage was that air had to be constantly supplied, which increased equipment costs and running costs.

Therefore, recently, a large roof with a cable truss structure has been proposed that can solve the above-mentioned problems.

However, although research and development of the truss structure itself, such as how to arrange cables in a cable truss structure, is actively conducted,
Not much research had been done on it, and very few had actually been constructed, so it lacked concreteness and was not easy to construct.

≪Object of the Invention≫ This invention has been made in view of the above-mentioned background, and its purpose is to provide a practical method for constructing a cable truss type roof structure with excellent workability. .

<<Structure of the Invention>> In order to achieve the above object, the present invention provides a method for constructing a roof structure in which top chord cables and diagonal cables with bundles arranged at appropriate locations are strung on beams forming the periphery of the roof structure. In this method, the outer ends of the upper string cables are fixed to the beams so as to be able to rotate freely in the vertical direction, and the outer ends of the diagonal cables are sequentially temporarily fixed to the beams in a loose state to arrange the entire arrangement. After that, the outer ends of the diagonal cables are tensioned and fixed to the beam, and tension is introduced into the upper string cable and the diagonal cables, and the tension introduced into the diagonal cables moves the bundle member upward. It is characterized in that the first string cable is stretched so as to rise upward.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a method for constructing a cable truss type roof structure according to the present invention.

In the construction method shown in the same figure, a beam 10 whose plane is formed into a substantially hexagonal shape and which forms the periphery of the roof structure is used.
Then, connect the opposing vertices of the beam 10 on a plane, and connect the upper chord cables so as to form two hexagons having the same shape and different diameters as the beam 10, spaced at equal intervals and directed toward the center of the beam 10. 12 and diagonal cables 14 are arranged, and rod-shaped bundle members 16 are arranged at the vertices of each hexagon and at the center of the beam 10, respectively.

In the construction method, first, the upper string cable 12, the diagonal cable 14, and the bundle material 16 are arranged.

The upper chord cable 12 connects the opposing vertices of the beam 10 in the radial direction.
a, and its outer end is locked so that it can freely rotate in the vertical direction, as shown in FIG.

The locking means is a sleeve-shaped connecting fitting 1 in which a bolt insertion hole is formed at the end of each upper string cable 12.
8 is fixed, and this connecting fitting 18 is attached via a pin 22 to a plate 20 buried near the upper end of the beam 10 and protruding from the inner surface thereof.

Then, the circumferential first chord cable 12b is arranged between the radial first chord cables 12a so as to form the same hexagon as the beam 10, and the first chord cable 12b in the radial direction and the circumferential direction intersect,
The upper end of each bundle material 16 is locked. Also, in the circumferential direction, a connecting member 15 forming a hexagonal plane similar to that of the upper chord cable 12 is provided between the lower ends of each bundle member 16.

Note that the circumferential first chord cable 12b can be omitted.

On the other hand, the diagonal cable 14 is notified in the radial direction.
As shown in FIG. 2a, from the lower end of the bundle material 16a located at the center, to the upper end of the bundle material 16b on the outside thereof, and from the lower end of the bundle material 16b to the further outer bundle material 1
6c and the lower end of the bundle material 16c to the vicinity of the upper end of the beam 10, each bundle material 16a,
The connection with 16b and 16c is a fixed connection,
The arrangement with the beam 10 is as shown in FIG.

That is, the outer end of the outermost diagonal cable 14a passes through the beam 10 and is inserted into a cylindrical sheath 24 buried inwardly,
The diagonal cable 14 abuts against the outer surface of the beam 10.
A wedge 26 is attached to fix the wedge 14a, and a tensioning jack 28 is attached to the edge of the wedge 26, and each diagonal cable 14a is temporarily fixed one after another in a loosened state.

Note that a sheath 24 is installed inside the beam 10 to avoid damage caused by sharp bends of the diagonal cable 14a.
A bracket 25 is provided under the opening.

The connection between the bundle material 16a and the first string cable 12a is shown in FIG.
2a, the diagonal cable 14, and the tie member 15 are shown in FIG. 2d, and the connection between the bundle member 16c, the upper chord cable 12a, the diagonal cables 14, 14a, and the tie member 15 is shown in FIG. 2e. Like cable 12a in FIG. 3, each cable is rotatably attached to gussets 17a-17j by connecting fittings. In addition, the gusset 17d in FIG. 2d,
A top string cable 12b (not shown) is attached to 17h.

As shown in FIG.
4. Due to the weight of the bundle material 16, the beam 10 forms a catenary curve shape that curves inward, and the lower end of each bundle material 16 is inclined toward the center.

Each cable 12, 14 and bundle material 16
When the whole is placed, the jack 28 attached to the outermost diagonal cable 14a is driven,
After tensioning the diagonal cable 14a by a predetermined amount so that it assumes a predetermined shape as shown in the imaginary line in FIG.
It is fixed to the beam 10 by a wedge 26. After fixing, the jack 28 is removed together with the jack stand 30.

With this operation, the upper string cable 12 becomes the state shown in the imaginary line in FIG.
As shown in Figure b, the first string cable 12 is raised upwards, tension is introduced into each cable 12, 14, and axial compressive force is introduced into each bundle 16, resulting in a stable state. It has a cable truss structure.

That is, when tension is applied to the diagonal cable 14a, an outward diagonally upward force is applied to the lower end of the outermost bundle member 16c. The vertical component of this force is the force that tries to push the bundle 16c upward (the bundle 16c
6c), and the bundle material 16
At the upper end of c, pull up the outer end of the diagonal cable 14 of the inner cable truss structure. In this way, the bundle members 16c, 16b, and 16a are pushed upward, and the first string cable 12 is pushed upward. The horizontal component of the tension in the diagonal cable 14a balances the reaction force generated in the circumferential tie member 15 and stabilizes the diagonal cable 16c in a vertical position.

Note that the jacks 28 attached to the outer ends of the diagonal cables 14a are attached via jack stands 30, but they can be placed on each jack stand 30 and tensioned at the same time, or they can be attached one after another only when tension is needed. It doesn't matter whether you're nervous or not.

Now, when the cable is constructed using the construction method having the above-mentioned configuration, when the bundle material 16 and the diagonal cable 14 are arranged, the first string cable 12 is in a downwardly curved state and its height is reduced. It can be installed using a simple temporary stand.

In addition, the construction is carried out after all the waxing cables 12, diagonal cables 14, and bundles 16 are placed at the designed positions.
Since this is done by tensioning the diagonal cables 14a on the outer periphery, even a large span roof structure can be easily erected, and the workability is also good.

FIGS. 4 and 5 show another embodiment of the invention, and only its features will be described below.

That is, in this embodiment, the upper string cable 1
2. Place the diagonal cable 14 and the tie material 15 on a flat surface,
In the case where the hexagonal beam 10 is arranged in a regularly arranged equilateral triangle, the outer ends of the first string cable 12 and the diagonal cable 14 are connected to the beam 10, one each. There are two locations A and two locations B.

For each point A, the method is the same as in the above example, and for each two points B, the sheath 24 is crossed on a plane at intervals in the vertical direction, and the same configuration as in the above example is used. Alternatively, a configuration as shown in FIG. 5 may be used.

That is, as shown in FIG. 5a, the upper string cable 12
A connecting fitting 18' bent at an angle of approximately 60 degrees is fixed to the end of the tie plate 1.
9 and are rotatably attached with pins 22 so that the bent portions are sandwiched from both sides of the plate 20.

On the other hand, each end of the diagonal cable 14a has a connecting fitting 1 bent in the same way as the upper string cable 12.
8' and connect them with a tie plate 19, and connect the connecting diagonal cable 14' to which a linear connecting fitting 18 is fixed in a three-pronged form with pins 22, thereby forming the connecting diagonal cable 14. ' is inserted into the sheath 24 embedded in the beam 10.

Even with this configuration, the same effects as in the above embodiment can be obtained.

In the above embodiment, the shape of the beam 10 is hexagonal, but the embodiments of the present invention are not limited to this, and may have other shapes, and the material thereof may be reinforced concrete. or steel frame.

Furthermore, the arrangement of the upper string cable 12, diagonal cable 14, and bundle material 16 is not limited to that described above. Furthermore, it is of course possible to attach and construct a roofing material such as a membrane material or a thin metal plate on the upper string cable 12.

<<Effects of the Invention>> As described above in detail in the examples, the method for constructing a cable truss type roof structure according to the present invention has specificity in accordance with the actual situation, is easy to construct, and is an extremely useful construction method. It's a method.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an overall perspective view, FIG.
b is an explanatory diagram showing the steps of the erection method, Figures 2 c to e
3 is a connection state diagram showing the connection between the bundle material and the cable, and FIG. 3 is a sectional view of the main part showing the connection between the cable and the beam. FIGS. 4 and 5 show other embodiments of the present invention, with FIG. 4 being an overall plan view and FIG. 5 being a plan view showing another arrangement of the cable and the beam. 10...Beam, 12...Top string cable, 14
... Diagonal cable, 16 ... Bundle material, 17 ... Gusset, 18 ... Connection fitting, 20 ... Plate, 2
2...pin, 24...sheath, 26...wedge, 28...jacket, 30...jacket stand.

Claims (1)

[Claims] 1. In a method of constructing a roof structure in which a top chord cable and a diagonal cable with bundles arranged at appropriate locations are strung on a beam forming the periphery of the roof structure, the outer end of the top chord cable is attached to the beam in the vertical direction. While the diagonal cables are rotatably locked, the outer ends of the diagonal cables are sequentially temporarily secured to the beam in a loose state to arrange the entire diagonal cable, and then the outer ends of the diagonal cables are tightened and attached to the beam. and tension is introduced into the upper string cable and the diagonal cable, and the tension introduced into the diagonal cable moves the bundle material upward so that the upper string cable is stretched upward. A method for constructing a cable truss type roof structure characterized by: