JPH0568583B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of constructing a cable dome for constructing a large dome-shaped roof for covering a large space such as a stadium.

[Prior Art] As shown in FIGS. 2 and 3, in a conventional cable dome, a large number of radial rigid cables 14 are installed from a center ring 12 at the center of a cable dome 11 to a compression ring 13 on the outer periphery. A large number of posts 15 arranged in a circular manner at the same position of each rigid cable 14
and a ring cable 1 that concentrically connects the lower part of the ring cable.
6 and center ring 12 or inner post 1
5, and a diagonal cable 17 extending outward through the upper part of the outer post 15. To construct this cable dome, as shown in Figure A in Figure 4, a central gantry with a height slightly lower than the compression ring 13 whose top position is located at the center of the cable dome and located at a high position corresponding to the bleachers. 18, the center ring 12 is placed on the top of the gantry, and a number of rigid cables 14 of a predetermined length are loosely hung radially between the center ring 12 and the compression ring 13 above the outer periphery of the cable dome. After the diagonal cable 17 is installed in the same state as shown in Figure B, one end of the diagonal cable 17 is attached to the compression ring 13, and the other diagonal cable 17 in the middle part is connected to the compression ring 13.
is placed at a predetermined position on a concentric circle centered on the center ring 12 of the rigid cable 14, and its tip 19 is allowed to hang down. Next, as shown in Figure C, connect the rigid cable 14 to 1 post 2 in order from the outside.
0. After attaching and hanging the upper end of the second post 21 and temporarily installing a brace (not shown) between the posts adjacent in the circumferential direction, the ring cable 22 is wound by winding the cable on the ground as shown in Figure D. Form. Next, as shown in figure E, each post 2
The ring cable 22 is attached to the lower end of the first post 20 and the compression ring 13, and the lower end of the second post 21 and the first
A diagonal cable 17 is attached between the upper end of the post 20 and the upper end of the post 20. Next, as shown in Figure F, the first
Lower part of post 20 and compression ring 13
The rigid cable 14 between the upper end of the first post 20 and the compression ring 13 is lifted by introducing tension into the diagonal cable 17 between the first post 20 and the compression ring 13. At this time, the center ring 12 lifts up from the center gantry 18 due to the tension of the rigid cable 14, so the lower ring 12a is attached to the center ring 12 as shown in Figure G, and a diagonal is connected between the lower ring 12a and the upper end of the second post 21. Attach cable 17.
Next, as shown in FIG.
By applying tension to the diagonal cables 17, 17 between the cables 2a, the entire rigid cable 14 is lifted to complete the cable dome.

[Problems to be Solved by the Invention] In the conventional cable dome construction method described above, the rigid cable 14 has two compression rings 13 at a high position corresponding to the audience seats and a compression ring 13 at a slightly lower but considerably higher height. The diagonal cable 1 is stretched high between the central gantry 18.
7 along the rigid cable 14, attaching the first post 20 and second post 21, or attaching the ring cable 22 to each post 20, 21, work at heights is highly dangerous and requires scaffolding. In addition, when tension is introduced into the diagonal cable 17 to make it tense, the rigid cable 14 is bent downward, so the diagonal cable 17 has to be pulled in a large amount, and a large tension is required. There are problems,
Furthermore, if tension is applied so that the dome has a high rise, the rigid cable 14 will become unstable, so it will be necessary to temporarily install braces between the posts 20 or 21 adjacent in the circumferential direction, which will significantly reduce costs and shorten the construction period. However, there was a problem that I could not expect.

[Means for Solving the Problems] In order to solve the above problems, the present invention installs a gantry supporting the center ring in the center, positions the center ring at a low position of the gantry, and connects the center ring and the outer periphery. The rigid cables are installed loosely in a radial manner between the compression rings, and the upper ends of the diagonal cables are attached to the rigid cables located on a concentric circle centered on the center ring, and the center ring is gradually raised to connect the outer posts and the inner Attach the upper end of the post to the position of the rigid cable with the diagonal cable attached, attach the ring cable to the lower end of the outer post and inner post, and attach the tip of each of the diagonal cables to the lower end of the outer post, inner post, and center ring. After installing the cable dome, the center ring is raised to the top position of the dome, and tension is sequentially introduced into the diagonal cable from the outside to the inside to raise the outer post and the inner post. The measures will be taken to:

[Example] An example of the present invention will be described with reference to the drawings.

As shown in Figure A in Figure 1, the first step is to install the gantry 1 at the center of the cable dome, and fit the center ring 2 into the gantry 1 so that it can rise, supporting it at a low position close to the ground. A large number of rigid cables 4 are laid loosely in a radial manner between the center ring 2 and the compression ring 3 on the outer periphery of the cable dome, and as shown in Figure B, the center ring 2 is placed at the center as a second step. Attach the upper end of the diagonal cable 6 to a predetermined position of the rigid cable 4 located on a concentric circle, and place it along the rigid cable 4 so that the tip lies on the ground. Next, as shown in Figure C, as a third step, the outer diagonal cable 6 is After attaching the hydraulic jack 8 to the gantry 1 and pulling up the center ring 2 so that the rigid cable 4 rises to the height at which the first post 7 can be attached from the ground, the first The post 7 is attached to the rigid cable 4, the ring cable 9 is attached to the lower end of the first post 7, and the lower ring 2a is attached to the lower part of the center ring 2. Next, as shown in Fig. E, as a fifth step, the second post 10 is attached. Pull up the center ring 2 so that the rigid cable 4 rises to a height where it can be attached from the ground, and attach the diagonal cable 6 to the lower end of the first post 7 and the lower ring 2a, and then attach the diagonal cable 6 to the second post as shown in Figure F. 10 to the rigid cable 4, and the diagonal cable 6 and ring cable 9 to the lower end of the second post 10, as shown in Figure G, as a sixth step, the center ring 2 is raised to the top position of the dome, Finally, as shown in Figure H, as a seventh step, tension is introduced into the diagonal cable 6 between the compression ring 3 and the first post 7.
The post 7 is raised, thereby raising the rigid cable 4 between the compression ring 3 and the upper end of the first post 7, then between the first post 7 and the second post 10, and then the second post 7. The cable dome is completed by sequentially introducing tension into the diagonal cables 6 between the cable dome 10 and the lower ring 2a, and raising the rigid cables 4 one after another from the outside to the inside. Furthermore, after the cable dome is completed, the gantry 1 will be dismantled and removed.

[Effects of the Invention] This invention has the following advantages: (1) A gantry is installed in the center of the cable dome, and the center ring is located at a low position close to the ground at the start of work. There is no need to install a large number of temporary scaffolds to attach the center ring to the rigid cable or to attach the ring cable, which eliminates the need for a large amount of materials and labor to install temporary scaffolds. (3) The diagonal cable and the inner and outer posts can be installed on the ground, so the diagonal cable does not have to hang long as in the past. (4) The rigid cable can be pulled up to the top position with the center ring, making it almost dome-shaped. Because of the conical shape, there is no need to repeatedly introduce tension into the diagonal cable, raise the post, and lift the rigid cable as in the past. When the rise of the dome becomes high, the rigid cable becomes unstable, so in order to prevent this, it is necessary to temporarily install a brace between adjacent posts, but this invention eliminates the material of the brace and the labor of constructing it. (6) Overall, the amount of cables used is small, materials for temporary scaffolding can be saved, costs can be reduced, construction is easy and labor can be saved, and construction period can be shortened.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of this invention.
H is an explanatory view as seen from the front, Fig. 2 is a perspective view showing the cable dome, Fig. 3 is an explanatory view showing a cut front view, and Fig. 4 shows the conventional method of constructing a cable dome. FIG. 1... Gantry, 2... Center ring, 3... Compression ring, 4... Rigid cable,
6... Diagonal cable, 7... Outer post, 9... Ring cable, 10... Inner post.

Claims (1)

[Claims] 1. A gantry 1 supporting a center ring 2 is installed in the center, the center ring 2 is positioned at a lower position of the gantry 1, and a rigid cable is installed between the center ring 2 and the compression ring 3 on the outer periphery. 4 are loosely installed radially, and the upper end of the diagonal cable 6 is attached to the rigid cable 4 located on a concentric circle centered on the center ring 2.
gradually raise the outer post 7 and inner post 10, attach the upper ends of the outer post 7 and the inner post 10 to the position of the rigid cable 4 to which the diagonal cable 6 is attached, attach the ring cable 9 to the lower ends of the outer post 7 and the inner post 10, and then attach the ring cable 9 to the lower ends of the outer post 7 and the inner post 10. After attaching the tips of the diagonal cables 6 to the lower ends of the post 7, the inner post 10 and the center ring 2,
The center ring 2 is raised to the top position of the dome, tension is sequentially introduced into the diagonal cable 6 from the outside to the inside, the outer post 7 and the inner post 10 are raised, and the rigid cable 4 is raised to the top position of the dome.
A method of constructing a cable dome in which the domes are raised one after the other. 2 A gantry 1 that supports the center ring 2 so that it can rise is installed in the center, and a large number of rigid cables 4 are installed radially between the center ring 2 placed at a low position on the gantry 1 and the compression ring 3 on the outer periphery. The first step of loose construction and center ring 2
The second step is to place the diagonal cable 6 along the rigid cable 4 located on a concentric circle centered on the center ring so that the tip lies on the ground, and the center ring until the outer post 7 can be attached to the rigid cable 4 from the ground. 2 and the upper end of the outer post 7 is connected to the rigid cable 4.
The fourth step is to attach the ring cable 9 to the lower end of the outer post 7 and attach the lower ring 2a to the lower part of the center ring 2, and the center ring 2 is attached until the inner post 10 can be attached to the rigid cable 4 from the ground. Pull up and attach the upper end of the inner post 10 to the rigid cable 4,
A fifth step of attaching the ring cable 9 to the lower end of the inner post 10 and the tips of each of the diagonal cables 6, attaching the diagonal cable 6 to the lower ring 2a, and a sixth step of raising the center ring 2 to the top position of the dome. and a seventh step of raising the rigid cable 4 one after another by sequentially introducing tension into the diagonal cable 6 from the outside to the inside and raising the outer post 7 and the inner post 10. A method for constructing a cable dome according to item 1.