JPH0756175B2 - How to build a roof for a structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of constructing a roof of a structure, and more particularly to a method of constructing a roof which is effectively used when constructing a long span structure.

"Prior Art" As a frame structure of a roof of a long span structure, various structures such as a truss structure, a shell structure, a suspension structure and an air film structure are used. Above all, a truss structure using a long-span parallel string truss beam is widely used because it has an advantage that the indoor space does not become larger than necessary and that it can be easily adapted to an extension.

In constructing such a structure with a long span truss structure, first, construct a structure that forms the outer wall of this structure, and lift a roof frame structure preassembled on the ground between the structures. It is common to use a construction method in which the roof is hung by hanging it over.

"Problems to be Solved by the Invention" By the way, in the roof erection method as described above, an ultra-large crane for lifting the assembled long span roof frame is required, or the inside of the structure However, there was a problem that the temporary construction work would be large-scaled, and this made it difficult in terms of construction period and construction cost. further,
When a structure constructed with trusses becomes long, not only will columns and beams be greatly deflected, but the weight ratio of the truss to the total weight of the structure will increase, which is uneconomical. was there.

The present invention has been made in view of the above circumstances, and is a method of constructing a roof that simplifies temporary construction work, shortens the construction period, reduces the construction cost, and can reduce the bending of the truss beam. Its purpose is to provide.

[Means for Solving the Problems] Therefore, the present invention is a method of erection a roof above a pair of structures forming an outer wall of a structure, and is orthogonal to the longitudinal direction of the structure. And a step of placing a erection gantry having a length extending in the direction and extending over the distance between the structures adjacent to one end of the structure, and placing the grounded roof framing unit on the erection gantry. A step of placing a roof on the roof frame unit, a step of introducing prestress to a lower chord member of the roof frame unit, the roof frame unit mounted on a frame frame and another roof frame unit The step of connecting above and the step of sending out the connected roof frame unit in the length direction of the structure and bridging them between the structures are provided. Ya on the unit I decided to do it after placing the roots.

"Operation" The roof frame unit assembled on the ground is placed on the temporary structure stand, and this is sent out in the length direction of the structure.
The roof is erected by sequentially connecting other roof frame units. In addition, the prestress introduced to the lower chord members of the roof frame unit increases the strength of the truss beams constituting the roof frame unit against the load.

[Embodiment] An embodiment of a method for constructing a roof according to the present invention will be described with reference to FIGS. 1 to 5. Here, FIG. 1 to FIG. 3 are side views for explaining one embodiment of the present invention, but for the sake of simplicity of description in these drawings, a completed portion of a roof erected by the erection method described below. 7 has already been shown.

In the drawings, reference numeral 1 denotes a structure on which a roof is to be installed, and the illustrated one represents a part (end) of one of the pair of structures. In order to build a roof on the structure 1, first, a temporary gantry is installed on one end side in the length direction of the structure 1 to have a height substantially the same as that of the structure 1 and slightly longer than a distance between the structures 1. Build 2. A guide rail 3 for slidingly moving the roof is attached to the girder 1a which constitutes the length direction of the upper portion of the structure 1, and the guide rail 3 projects from the end of the structure 1. It extends above the temporary gantry 2. The projecting portion of the guide rail 3 may be removed after the roof has been installed.

Next, a method of constructing a roof following the state shown in FIG. 1 will be described. The assembled roof frame unit 4 is placed on the guide rails 3 on the temporary gantry 2 by an unloading device such as a truck crane. The roof frame unit 4 is a roof structure to be erected on the structure 1, and is formed of a truss.

Next, the roof body 5 and the ceiling of the roof frame unit 4 are constructed to complete one unit constituting the roof. In this embodiment, the roof body 5 is composed of divided roof bodies 5a and 5b which are divided in the length direction (direction orthogonal to the length direction of the structure 1).

Thereafter, one unit of the roof body 5 is further placed on the roof body 5 (FIG. 2). By doing so, when prestressing is introduced to the roof frame unit 4, which will be described later, the roof body 5 becomes a load and the frame unit 4
It is possible to prevent peeling of the roof and it is extremely convenient when constructing a roof on the adjacent connection part.

Next, prestress is introduced into the lower chord member 4a constituting the roof frame unit 4. As shown in FIG. 4 and the like, the lower chord member 4a is made of H-shaped steel. To introduce prestress, the lower chord member 4a penetrates through ribs 9 provided at predetermined intervals on both sides of the web 8. The PC steel wire 11 passed through the sheath tube 10 having the length of the entire lower chord member 4a may be tensioned. After tensioning the PC steel wire 11, its both ends are fixed to both ends of the lower chord member 4a. The truss thus introduced with the prestress, that is, the roof frame unit 4 can not only reduce its deflection but also bear a part of the tensile load applied to the lower chord member 4a by the introduced prestress. Therefore, the roof frame unit 4 can be reduced in weight accordingly.

When the prestress is introduced into the roof frame unit 4, the roof frame unit 4 and the completed section 7 are connected. As shown in FIG. 2, the completed portion 7 is formed by connecting members 6 having the same span as the roof frame unit 4.
It suffices to connect the roof frame unit 4 located at the end of the roof frame unit 4 and the roof frame unit 4 on the temporary frame 2 to each other.

Next, the attachment work of the roof body 5 and other ceilings is performed on this connecting portion. At this time, since the roof body 5 to be constructed at this connecting portion is already placed on the roof frame unit 4 adjacent to both sides of this connecting portion, the work is very simple.

And if the construction of the roof of the connection part etc. is completed,
As shown in FIG. 3, on the guide rail 3 by moving means (not shown), two spans in the length direction of the structure 1,
In other words, the distance for the span of the next roof frame unit and the connecting portion is slid and sent out.

If the above steps are performed, then the temporary gantry 2
After placing the next roof frame unit 4 grounded on it, applying the roof body 5 to it, and further placing the roof 5 of the adjacent portion on it, on the lower chord member 4a of this roof frame unit 4. After introducing prestress and connecting with the completed part 7, and finishing the construction of the roof body and ceiling of this connection part, in the same way as above, send out on the guide rail 3 in the length direction of the structure 1. Good. Hereinafter, the roof covering the entire upper part of the structure 1 is erected by sequentially repeating the above procedure.

Although the method described above has been described assuming that the completed unit 7 already exists, at the beginning of the process, that is, at the stage where the completed unit 7 does not yet exist, the temporary installation is performed similarly to the procedure described above. The roof frame unit 4 that has been prestressed after the roof, ceiling, etc. have been installed on the gantry 2.
It is sufficient to send the two spans on the guide rail 3 alone in the longitudinal direction of the structure 1 as it is.

According to the above method, when constructing the roof, no work such as temporary construction work inside the structure is necessary, and all work can be performed only from the outside. Therefore,
Not only can other work be performed in parallel in the internal space, but the unloading device required for this work is only required to have the ability to safely suspend one roof unit 4. Furthermore, since prestress is introduced into the lower chord member 4a of the roof frame unit 4 made of a truss, the bending can be reduced and the weight can be reduced.

It is also possible to eliminate the protrusion of the guide rail 3 from the structure 1 by arranging and installing the erection gantry 2 between the structures 1.

[Effects of the Invention] As described above, according to the method for erection of the roof of the structure according to the present invention, the roof framing unit is completed on the temporary gantry, and it is sent out and sequentially connected and added. Therefore, the work such as temporary construction work inside the structure is not necessary at all, it is possible to carry out all the work only from the outside, and because a large crane etc. is not required, the construction period can be shortened, And reduce the construction cost. Furthermore, since prestressing is introduced into the lower chord members of the roof frame units that make up the roof, it is possible to reduce the bending of the roof frame units or reduce the weight of the units, which is not only economical, but especially long spans. It has excellent effects such as being applicable to structures.

[Brief description of drawings]

1 to 3 are side views for explaining an embodiment of a method for constructing a roof of a structure according to the present invention. 4 and 5 are views showing a truss constituting the roof frame unit 4, FIG. 4 is a partial front view thereof, and FIG. 5 is a sectional view taken along the line II ′ in FIG. 1 …… Structure, 2 …… Temporary gantry, 4 …… Roof frame unit, 4
a …… Lower chord member, 5 …… Roof body, 6 …… Connecting member, 7 …… Completed part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Koshida 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shuji Okuda 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Building Co., Ltd. (72) Inventor Hideo Shimomura 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Honda Kyushu 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Masato Kawaguchi 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Kunoo Kuno 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. In-house (72) Inventor Takeki Kumagai 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tetsuo Aoyama 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. Inside the company (72) Kenichi Sugisaki 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tadayoshi Fujii 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor, Kido, 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor, Hiroshi Ueda, 2--16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction ( 72) Inventor Kunio Mogi 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Nobuo Kato 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction (56) References JP-A-57-116868 (JP, A)

Claims (1)

[Claims] 1. A method of erection a roof between a pair of structures forming an outer wall of a structure, the method extending between the structures extending in a direction orthogonal to a length direction of the structures. A step of providing a temporary gantry having a length over a distance adjacent to one end side of the structure, a step of placing the roof frame unit erected on the temporary gantry, and a roof being placed on the roof frame unit. A step of introducing a prestress to the lower chord member of the roof frame unit, a step of connecting the roof frame unit mounted on a temporary frame to another roof frame unit on the structure, and connecting The step of feeding the roof frame unit to the structure in the longitudinal direction and bridging it between the structures, and in the step of introducing prestress to the lower chord member, the roof is placed on the roof frame unit. Characterized by doing later Erection method of the roof of that structure.