JP4036275B2 - Construction method of large roof by vent method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a large roof by a vent method.
[0002]
[Prior art]
Conventionally, vent construction methods shown in FIGS. 4 to 6 are known as typical construction methods for constructing a dome-shaped or ring-shaped large roof.
In this construction method, first, a large roof to be constructed is laid in units of block roof units (hereinafter referred to as block roofs). Next, as shown in FIG. 4, the block roof 2 is installed on a support member 4 such as a pillar spaced apart from each other, and a vent gantry 6 installed between the support members 4. Here, a jack 8 is disposed on the vent gantry 6, and a part of the block roof 2 is placed on the jack 8. In addition, the member of the code | symbol 10 connected with the center lower part of the block roof 2 is a bundle material used at the time of cable tension.
[0003]
Next, as shown in FIG. 5, the jack 8 on the vent gantry 6 is moved up to check the vent reaction force.
Next, as shown in FIG. 6, the cable 12 is stretched between the lower end portion of the bundle member 10 and both end portions of the block roof 2, and the jack 8 is moved down by a predetermined amount, and at the same time, a tension jack (not shown), etc. The tension is applied to the cable 12 using the above device. At this time, the down operation of the jack 8 is divided into a plurality of steps, and the tensioning operation of the cable 12 is similarly divided into a plurality of steps, and the jack 8 is gradually lowered so that the final design tension T _S is finally obtained. Operation, tension operation of the cable 12 is performed.
[0004]
[Problems to be solved by the invention]
However, the construction method described above places jacks 8 on each vent gantry 6, and each jack 8 must use a large apparatus, which may increase the construction cost.
Further, since the down operation of the jack 8 and the tension operation of the cable 12 must be performed in a plurality of steps, the jack down management during construction and the tension management of the cable 12 become complicated, and the vent gantry 6 is Since the installation period is long, it hinders the frame construction under the large roof, which is problematic in terms of workability.
[0005]
The present invention has been made in view of the above circumstances, and provides a method for constructing a large roof by a rational vent method excellent in economic efficiency and workability, which requires no or almost no jack at the top of a vent gantry. It is aimed.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a method for constructing a large roof by a vent method according to the present invention includes a step of laying a large roof to be constructed for each block roof unit, and supporting the block roof unit such as columns separated from each other. A cable is installed between the lower end of the bundle connected to the center of the lower surface of the block roof unit and both ends of the block roof unit. Disposing the vent gantry and introducing a first-stage tension to the cable via the bundle by downward displacement of the block roof unit; and a large roof constituent member for the block roof unit When the block roof unit whose weight is increased by the large roof constituent member is further displaced downward, the first stage tension is applied to the cable via the bundle. Ri is a method which includes a step of gradually introducing the major design tension.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment of a construction method of a large roof by a vent method according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component as the conventional construction method shown in FIGS. 4-6, and the description is abbreviate | omitted.
Also in the present embodiment, first, a large roof to be constructed is laid for each block roof unit (hereinafter referred to as a block roof).
[0008]
Next, as shown in FIG. 1, the block roof 2 is installed on a support member 4 such as a pillar spaced apart from each other and a vent gantry 6 installed between the support members 4. Here, a small jack 14 is arranged on the vent gantry 6 so that the height of the block roof 2 can be slightly adjusted.
Next, as shown in FIG. 2, the cable 12 is stretched between the lower end portion of the bundle member 10 and both ends of the block roof 2, and the vent gantry 6 supporting the block roof 2 is dismantled. . As a result, the entire block roof 2 moves downward, and the bundle 10 moves downward therewith, so that the first stage tension T ₁ is automatically introduced into the cable 12. The first stage tension T ₁ is smaller than the finally introduced design tension T _S (T ₁ <T _S ).
[0009]
Next, as shown in FIG. 3, the roof finishing material 16 is laid on the upper portion of the block roof 2. By laying the roof finishing material 16, the weight of the block roof 2 is increased, whereby the bundle material 10 further moves downward. At this time, the design tension T _S is introduced into the cable 12. In addition, the said roof finishing material 16 is corresponded to the large roof structural member of this invention.
[0010]
Thus, in this embodiment, it is possible to construct a large roof without arranging a large jack on each vent gantry 6, and it is necessary to perform jackdown management and cable tension management as in the conventional method. Since there is no such thing, it is possible to provide an economical method with reduced equipment and labor costs.
Moreover, since the tension | tensile_strength is introduce | transduced into the cable 12 using the load of the block roof 2 and the roof finishing material 16, it becomes a simple large roof construction method compared with the conventional method.
[0011]
Further, as shown in FIG. 3, the vent gantry 6 supporting the block roof 2 is dismantled at an early stage, and the construction of the lower housing 18 can be performed in parallel with the construction of the large roof. It can be shortened.
In addition, the large roof structural member of this invention is not restricted to the roof finishing material 16 mentioned above, For example, what is necessary is just a member in which the dead weight of the block roof 2, such as a roof reinforcement member and an internal lighting installation, increases.
[0012]
【The invention's effect】
As described above, according to the method for constructing a large roof according to the vent method of the present invention, it is possible to construct a large roof without arranging a large jack on each vent gantry. Since it is not necessary to perform down management and cable tension management, it is possible to provide an economical method with reduced equipment and labor costs.
[0013]
Moreover, since the tension | tensile_strength is introduce | transduced into the cable using the load of a block roof unit and a large roof structural member, it becomes the construction method of a simple large roof compared with the conventional method.
Furthermore, since the bent gantry supporting the block roof unit is dismantled early, and the lower frame can be constructed in parallel with the construction of the large roof, the construction period can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a view showing a state in which a block roof unit is installed on a support member such as a pillar and a vent gantry installed between the support members in the present invention.
FIG. 2 is a diagram showing a state in which the first stage of tension is introduced into the cable by dismantling the vent gantry.
FIG. 3 is a view showing a state in which a large roof constituent member is arranged in a block roof unit and design tension is introduced into a cable.
FIG. 4 is a diagram showing a state in which a block roof unit is installed on a vent gantry equipped with a large jack in a conventional large roof construction method.
FIG. 5 is a diagram showing a state in which a jack up operation is performed in a conventional large roof construction method.
FIG. 6 is a diagram showing a state in which a jack down operation and a cable tension introduction operation are performed simultaneously in a conventional large roof construction method.
[Explanation of symbols]
2 Block roof (block roof unit)
4 Support Member 6 Bent Gantry 10 Bundle Material 12 Cable 16 Roof Finishing Material (Large Roof Component)
T ₁ First stage tension T _S Design tension

Claims (1)

A process of laying a large roof to be constructed for each block roof unit;
Laying the block roof unit on support members such as pillars spaced apart from each other and a vent gantry installed between these support members;
A cable is stretched between the lower end portion of the bundle member connected to the lower surface central portion of the block roof unit and both ends of the block roof unit, and the vent gantry is disassembled to cause downward displacement of the block roof unit. Introducing a first stage tension into the cable via the bundle;
A large roof constituent member is arranged in the block roof unit, and the block roof unit whose weight is increased by the large roof constituent member is further displaced downward, whereby the first roof is connected to the cable via the bundle member. And a method for constructing a large roof by a vent method, characterized by comprising a step of introducing a design tension larger than a stage tension.

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