JPS6333531B2 - - Google Patents

Description

[Detailed Description of the Invention] (Prior Art) When constructing a large dome, generally, after connecting beams in a planar shape as shown in FIGS. , by lifting it from below with a jack, etc.
It is designed to have a three-dimensional dome shape, and then a person climbs onto the three-dimensional dome to fix each connecting portion 22 of the beam.

However, in this case, since the height of the dome is quite high, large-scale special equipment such as a crane and jack is required. There is the inconvenience of having to transport the materials to the construction site one by one. In particular, in the case of a large dome with a height of about 10 meters that houses a meteorological radar, large-scale special equipment such as a crane must be transported to the top of a high mountain, which is extremely troublesome.

Furthermore, Japanese Patent Laid-Open No. 56-20251 has been provided as a recent method of constructing a large dome. As described in the specification of this product, hinges are provided at the nodes of the beams, and the hinges are extended by lifting the entire structure, thereby forming a dome shape. Although this case has the advantage of being able to work on the ground, there is a problem in that large-scale special equipment is always required to lift the whole thing.

(Purpose) The present invention was made in view of the above circumstances, and its purpose is to eliminate the need for the use of large-scale special equipment such as cranes and jacks, or to minimize the use of large-scale special equipment such as cranes and jacks. The object of the present invention is to provide a method that can be used for construction and is therefore suitable for construction in remote areas, remote islands, mountain tops, etc.

(Structure) The present invention determines the curvature and crossing angle of the beams constituting a large dome, curves the beams in advance according to the determined curvatures, intersects the beams, and rotates the intersecting portions. This is a method in which the angle is adjusted to the above-determined crossing angle, the beam is fixed in the adjusted state, and then other beams are successively connected. A feature of the present invention is that the intersection angle of the beams is adjusted to the determined intersection angle by rotating the intersection portions of the beams, and the beams are fixed in the adjusted state.

The drawings show an embodiment to which the present invention is specifically applied, and the present invention will be explained below based on this embodiment.
Fig. 1 is a plan view of the beam 1 constructed in the shape of a birdcage, Fig. 2 is a side view of the same, and Fig. 3 shows a canvas 2 stretched over the constructed beam 1, and a long tube 3 forming an entrance. FIG. 3 is a perspective view of a state in which it is provided and fixed with a rope 4.

In FIGS. 1 and 2, a large number of beams 1 constitute the framework of a large dome, and are provided in a manner that they intersect with each other. In the case of the example shown in the drawing, two beams 1 are installed in parallel in close proximity by lightweight and strong FRP rods. The curvature and intersection angle of each beam 1 are determined in advance according to the assembly position of the beam 1, and the beam 1 is curved in advance according to the curvature. It is desirable that the bending be performed in advance during the manufacturing process of the beam 1. Note that the curvature and intersection angle of each beam 1 are often different.

Next, the beams 1 are crossed with each other. When crossing, in the case of the example shown in the drawings, a crossing tool 5 is used which allows the crossing angle of the beam 1 to be adjusted as shown in FIGS. 4 to 6. The cross tool 5 includes an insertion member 6 provided in an overlapping state, a cover 7 fitted to the insertion member 6, and a bolt 8a that fixes these and allows the insertion member 6 to rotate in a loosened state. and a fastener 8 having a nut 8b.
The insertion member 6 is made of hard rubber or synthetic resin molded product to increase the frictional force.
As shown in FIG. 6, it has an insertion hole 9 extending parallel to both sides, through which the beam 1 can be inserted, and also has an uneven part 11 on the top surface, and a fastener 8 in the center.
It has a bolt insertion hole 12 into which the bolt 8a is inserted.

Thus, a beam 1 is inserted into each of the insertion holes 9 of the insertion member 6.
By inserting the beams 1, the beams 1 are made to intersect alternately as shown in FIG. Next, the intersection angle of the beams 1 is adjusted by rotating the intersection portions of the beams 1. As mentioned above, the intersection angle is predetermined according to the assembly position of each beam 1, and is adjusted to this determined intersection angle. In the case of the example shown in the drawing, the adjustment is made using the bolt 8 of the fastener 8.
This is done by appropriately rotating the beam 1 with a loosened. In FIG. 2, the crossing angle of the crossing tool 5 is θ, and its two insert members 6 are alternated. If the length of the beam 1 is long, it is preferable to divide it into predetermined lengths and connect the ends with appropriate connectors. FIG. 8 and FIG. 9 show an example in the middle of connection.

Once the adjustment has been made as described above, the beam 1 is fixed in the adjusted state so that it cannot rotate. In the example shown in the drawings, this is done by tightening the bolt 8a of the fastener 8. In this case, the insertion member 6 is made of hard rubber with a large frictional force as described above, and the uneven portion 11 is formed in the overlapped portion.
1 engage with each other, thus preventing the insertion member 6 from shifting, and there is no problem that the intersecting angle varies during or after construction.

(Effects) As described above, in the present invention, a pre-curved beam 1 is used to construct a three-dimensional structure from the beginning, and by rotating the intersection portion of the beam 1, the intersection angle can be adjusted. Since the dome is adjusted, the dome can be constructed without requiring the use of large-scale special equipment such as a crane or jack, or with a minimum amount of use, unlike conventional equipment.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a plan view of a beam constructed in the shape of a birdcage, Figure 2 is a side view of the same, and Figure 3 is a diagram of a canvas stretched over the constructed beam. Completed perspective view, Figure 4 is a perspective view of the crossing tool with the beam inserted, Figure 5 is a longitudinal side view of the same, Figure 6
The figure is a perspective view of the insertion member, and FIGS. 7A and 7B are side views for explaining the conventional method. FIGS. 8 and 9 are side views showing a state in which the beams are connected. In the figure, 1 is a beam, 5 is a cross member, 6 is an insertion member, and 8 is a fastener.

Claims (1)

[Claims] 1 Determine the curvature and intersection angle of the beams that make up the large dome, bend the beams in advance according to the curvatures, intersect the beams, and rotate the intersection part to adjust the intersection angle of the beams to the determined intersection. Adjust to the angle,
A method of constructing beams that make up a large dome, in which the beams are fixed in an adjusted state, and then other beams are connected in sequence.