JPH10204997A - Cable dome erecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable dome which assures a small tension applied to each diagonal in the erecting operation, facilitates control of the tightening works, and enables quick execution of works. SOLUTION: A cable dome includes struts 4 whose tops are attached to the intersection of main cables 3 arranged in the radial and circumferential directions or in the form of lattice, when viewed on the plan, wherein the struts 4 are supported by tying the bottom of each struct 4 by a diagonal 5 to the top of another strut 4 positioned nearer the end part adjacent to the first named strut 4. The constituent members are primarily assembled in the condition that only part of each diagonal 5 is elongated from the design length, and each provisionally installed rope 10 having a certain length is attached to the top of each strut 4, while the other ends of the provisional ropes 10 are gathered, and the gathering end is lifted by a crane 12, and the members are installed in their specified positions approximately so that a dome shape is generated, and with this condition held, the diagonals 5 are tightened into the specified length and fixed. Thus the skeleton of the dome is erected in the normal position, and then the ropes 10 are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a cable dome which can be quickly raised into a dome shape after laying members constituting the cable dome.

[0002]

2. Description of the Related Art As a method of constructing a radial cable dome, for example, the prior art shown in FIGS. 6 to 8 is known. This cable dome is provided with a center tension ring 2 disposed at a central portion inside a wall 1 constructed in a circular shape.
A main cable 3 radiating from the tension ring 2, a plurality of bundles 4 having upper ends connected to the main cable 3, and an oblique connection between a lower end of the bundle 4 and an upper end of the bundle 4 outside the main cable 3. A material 5 and a ring cable (not shown) connecting the lower ends of the bundles 4 in the circumferential direction are provided. From the state in which the members are assembled as shown in FIG. A pulling force is applied to the outside of the slant 5 fixed to the upper end of the bundle 4 at the end and the lower end of the bundle 4a on the inner side to raise the bundle 4, and subsequently, the same as the slant 5 of the inner bundle 4a. By repeating the operation of applying the tensile force of FIG.
Has been completed.

[0003]

However, in the above-mentioned construction method, the work of tensioning the diagonal material is controlled because the diagonal material supports the entire load and is sequentially raised in a dome shape. It is difficult to adjust the tension of each part, and it takes a long time to perform the construction.

The present invention solves the above-mentioned drawbacks. An object of the present invention is to reduce the tension applied to each diagonal member during a start-up operation, to easily control a tension operation, and to enable rapid construction. And a method for constructing a cable dome.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bundling material having an upper end attached to an intersection of main cables arranged on a plane, in a radial direction and a circumferential direction, or in a grid. Cable that connects the lower end of the bundle and the upper end of the bundle near the end adjacent to the bundle with a diagonal material, and that connects the lower ends of the bundles with a ring cable that connects in the circumferential direction to support the bundle. In the dome, after assembling the members with all or a part of the diagonal member or the ring cable being longer than a design length, a temporary rope having a predetermined length is attached to an upper end of each bundle, and The other end of the rope is gathered at one or several places, the gathered end is lifted by lifting means, and the respective members are erected at substantially predetermined positions to form a dome shape, and the design length is maintained while maintaining this state. Oblique longer than Or by fixing by tensioned ring cables to length, assembled dome normal position, then, is characterized in that removing the temporary rope.

Therefore, in the method of the present invention, in the state of being suspended by the temporary rope, the entire load is not applied to the diagonal material, and the tension work is only required to stand each bundle material vertically. It can be done easily. Then, by removing the temporary rope, the load is deposited on the diagonal material, and in this state, the load becomes independent while maintaining the dome shape.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1
FIG. 3 shows a construction procedure when the present invention is applied to construction of a radial cable dome. Since the members forming the dome are almost the same as those in the related art, the same members will be described using the same reference numerals, and only the newly added portions will be described using different reference numerals.

In the figure, the cable dome includes a center tension ring 2 disposed at a central portion inside a wall 1 constructed in a circular shape and a main cable 3 radiating from the tension ring 2 in a radial manner, as in the prior art. When,
A plurality of bundles 4 whose upper ends are connected to the main cable 3
1, a diagonal member 5 connecting the lower end of the bundle 4 and the upper end of the outer bundle 4 and a ring cable (not shown) connecting the lower end of each bundle 4 in the circumferential direction. As shown in (1), the work of assembling each member is exactly the same as the conventional one.

However, unlike the conventional method, each member is laid in a state where only a part of the diagonal member 5 is longer than the design length.
In addition, a wire rope 1
0 is connected at one end.

Next, as shown in FIG. 2, the other end of the temporary wire rope 10 is slung on the hook block 12a of the crawler crane 12 and rolled up. 6 is lifted in the same shape as the completed state.

In this suspended state, some of the diagonal members 5 longer than the designed length are in a loosened state when the diagonal members 5 are cables, and the diagonal members 5 are rigid rod-shaped. In the case of a member, the bundle 4 that is to be finally in a vertical posture is inclined. Therefore, in this state, a part of the diagonal member 5 is corrected to a regular cable dome shape by being tensioned or shortened until the length becomes substantially the designed length. Means for tensioning or shortening include turnbuckles, screw spindles, jacks, and the like. When the diagonal member 5 is a rope, the extra length of the rope end of the diagonal member 5 wrapped around a pulley provided at a position to be the end of the diagonal member 5 can be tensioned by a winch. At this point, since the entire cable dome is suspended on the temporary wire rope 10, a large load is not applied to each member, and the work of tensioning or shortening is relatively easy. Thus, a portion of the diagonal member 5 that has been tensioned or shortened by any of these means is fixed.

However, in this construction method, since the tension work is performed in a state where no load is applied, it is necessary to set the tension length in consideration of the initial elongation when the load is applied,
This kind of problem can be solved by performing a tensioning operation in advance with a length in consideration of the amount of elongation or by lifting the tensioner at a position higher than the desired shape.

After that, if the load is sequentially deposited on the diagonal member 5 while the pulling force of the wire rope is reduced, the diagonal member 5 bears the load in a state of being extended by the initial elongation amount, and completely retains the shape of the cable dome. I do. Thereafter, each wire rope 10 is hung and removed from the hook block 12a, and the wire rope 10 itself is also removed, thereby completing the frame 6 of the cable dome as shown in FIG.

Incidentally, this kind of cable dome is generally a large-scale building, and as shown in the drawing, it is often impossible to lift the cable dome from the viewpoint of its scale with only one crawler crane 12. Therefore, in such a case, as shown in FIG. 4, for example, a plurality of crawler cranes 12 may be used to carry out the lifting operation at the same time while sharing the load.

Alternatively, as shown in FIG. 5, for example, a plurality of tower posts 14 or tower cranes are temporarily erected inside the building, and the wire ropes 10 are suspended and supported by the tower posts 14 or tower cranes, thereby lifting each member. You can also.

Further, in the above embodiment, the case where the construction method of the present invention is applied to a radial cable dome has been described. However, it is needless to say that the construction method can be applied to a lattice-like cable dome.

Further, the member which is longer than the design length is
Instead of the diagonal member 5, all or a part of the ring cable may be used.

[0018]

As is apparent from the above description, in the method of constructing a cable dome according to the present invention, each member constituting the skeleton is suspended in advance by a temporary rope, and the dome shape is maintained. Compared to the conventional construction method in which the diagonal material is tensioned, the tension applied to each diagonal material is small, and the tensioning work can be controlled easily and quickly There is an advantage that construction is possible.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a laying stage in a construction method of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a state of being lifted by the temporary rope.

FIG. 3 is an explanatory sectional view showing the completed state.

FIG. 4 is an explanatory sectional view showing a lifting state using a plurality of crawler cranes.

FIG. 5 is an explanatory cross-sectional view illustrating a lifting state using a plurality of tower posts.

FIG. 6 is an explanatory cross-sectional view showing a laying stage in a conventional construction method.

FIG. 7 is an explanatory sectional view showing the start-up process.

FIG. 8 is an explanatory sectional view showing the completed state.

[Explanation of symbols]

 3 Main cable 4 Bundle material 5 Diagonal material 6 Cable dome (frame) 10 Temporary wire rope 12 Crawler crane (lifting means) 14 Tower post (lifting means)

Claims (1)

[Claims] 1. A lower end of a bundle having an upper end attached to an intersection of main cables arranged on a plane, in a radial direction and a circumferential direction, or in a lattice, and a bundle near an end adjacent to the bundle. A cable dome of a type that connects the upper end of the bundle with a diagonal material and supports the bundle by connecting the lower end of each bundle with a ring cable that ties the circumference of the bundle, wherein all or a part of the diagonal material or the ring cable After assembling the members in a state longer than the design length, a temporary rope of a predetermined length is attached to the upper end of each bundle, and the other end of each temporary rope is assembled at one place or several places,
The assembly end is lifted by lifting means, and the respective members are erected at substantially predetermined positions to form a dome shape. While maintaining this state, a diagonal member or a ring cable longer than the design length is tensioned to a predetermined length. A cable dome construction method characterized by assembling the dome at a regular position by fixing the cable dome, and then removing the temporary rope.