JPH0797867A - Construction method of large-sized roof dome truss - Google Patents

Abstract

PURPOSE:To construct a large-sized roof dome truss with high precision safely in a short time. CONSTITUTION:A large-sized roof dome truss 10 is assembled through the ground erection of the dome truss parts 10A, 10B, and 10C each of which has a ring-shaped three-divided shape. Then, the dome truss part 10C is connected with the dome truss part 10B, and the connected dome truss parts 10B and 10C are connected with the dome truss part 10A, and an integral dome truss 10 is constituted. The dome truss 10 is lifted up on the peripheral wall 5 of a building and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a large roof dome truss for forming a roof of a multipurpose facility building or the like.

[0002]

2. Description of the Related Art As a construction method for constructing a large roof dome, there is one shown in FIG. That is, 1 in step 1
The floor frame is constructed and a rotary mount 101 is provided, and in step 2, the upper frame and the steel frame are sequentially assembled and joined from the outer periphery at the ground level toward the center using a tower crane, a crawler crane and the like. In the middle part, the frame units 111 ... 111 assembled on the rotary mount 101 are sequentially rotated in the direction of the installation range, and in step 3, the large roof dome truss 100 is completed. In Step 4, the building peripheral wall 105 is provided with a lift-up machine 103 such as a center hole jack, and Step 5
Then, the dome truss 100 is lifted up and fixed to the building peripheral wall 5 by the lift-up machine 103, and the process is completed as shown in step 6.

[0003]

However, in the conventional construction method as described above, the temporary mount 101 to be rotationally moved needs to be large-scale and have sufficient rigidity, which is expensive, and the roof dome truss. It is difficult to secure a working area for the crane at the erection stage in the central part of. Also, when the entire roof dome truss is divided into the outer peripheral part, the middle part, and the central part in plan view, the movable scaffolding can be adopted only for the middle part in the rotary movable frame, and for the other parts. Is a troublesome construction method because the conventional assembly and disassembly scaffold is used. Furthermore, problems such as the need for special measures to be taken when an earthquake occurs during the construction of the middle and central areas, which gradually increase in height, have occurred.

The present invention has been devised in view of the problems of the above-mentioned conventional construction method. It is possible to reduce the construction cost by reducing the number of temporary members, and it is easy to secure a place for work by a crane.
It is intended to provide a construction method for a large roof dome truss that can ensure the safety of construction in the event of an earthquake.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] The construction method for a large roof dome truss according to the present invention to achieve the above object is a central dome truss having a shape obtained by dividing a large roof dome truss into a plurality of rings in plan view. And the process of assembling each ring dome truss on the ground, the process of sequentially lifting up and connecting the inner dome truss to the outer ring dome truss, and finally constructing the large roof dome truss It is characterized by the process of lifting up on the peripheral wall of the building.

A process of constructing the peripheral wall of the building during the assembling process and / or the connecting process of the central and ring-shaped dome trusses can be included in the above configuration.

[0007]

In the construction method of the large roof dome truss having the above structure, the large roof dome truss is divided into three in a ring shape in plan view, for example, the outer peripheral portion, the middle portion, and the central portion, and these are grounded. Since several of them are assembled in parallel at the same time with a crane and a low scaffold, a large and expensive hypothetical pedestal is not used, and the construction cost can be reduced and the construction period can be shortened. Further, since the inner dome truss is sequentially lifted up and connected to the outer ring dome truss, proficiency of work and reliable progress of work can be expected. The large roof dome truss that was finally assembled has a high finishing accuracy, and even if it is lifted up on the peripheral wall of the building, the installation work will be easier and the lift-up equipment can be used effectively. Further, the erection and assembly of the divided basic parts can be carried out at a level close to the ground level, and it is easy to ensure accuracy and safety.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction method for a large roof dome truss according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing an example of dividing a large roof dome truss according to the present invention into three parts, FIG. 2 is an explanatory view showing a construction procedure of the large roof dome truss, and FIG. 3 is a large roof dome. It is a partial top view which shows the basic grid of a truss.

As shown in FIG. 1, a ring-shaped dome truss portion 1 on the outer peripheral portion of a large roof dome truss 10 in plan view.
0A and a ring-shaped dome truss portion 10B which is an intermediate portion of a regular hexagon and a central dome truss portion 1 which is a central portion of a regular hexagon.
Divide into 0C and assemble on the ground. The ground is reinforced with earthen concrete to withstand the load of cranes and vents.

As shown in FIG. 2A, first, the ring-shaped dome truss portion 10A and the ring-shaped dome truss portion 10B are assembled from the outer periphery and the center by using a crawler crane, and then the central dome truss portion 10C is connected to the track lane. Assemble using. The assembly is performed while measuring the position of each node at night when the temperature is constant, and also performing the accuracy control based on the deformation of the dome truss portion in advance based on its own weight. Each dome truss section 10A, 10B, 10C
The suspension scaffold used later when attaching roofing material is attached to this. In addition, the purlin material for attaching the roof finishing material is temporarily fixed. Here, the outer peripheral members of the central dome truss portion 10C and the ring-shaped dome truss portion 10B are temporarily fixed by a clamp or the like for accuracy adjustment so that the connecting work can be smoothly performed between subsequent blocks.

Next, as shown in FIG. 2B, for example, six lift-up vents 21 ... 21 are installed on the outer peripheral portion of the central dome truss portion 10C, and the central dome truss portion 10 is provided.
The support vent 22 supporting C at each node is released to check the accuracy. After confirming and making necessary corrections, the wire clamp type center hole jacks 25 ... 25 mounted on the lift-up vents 21 ... 21 are operated, and the hoisting position is measured using a surveying instrument. The central dome truss section 10C is connected to the ring-shaped dome truss section 10B under computer control by physically performing a data logger. The joining portions of the opposing members of both dome truss portions 10C and 10B are adjusted and main welding is performed to connect them, but the lift-up vent 21 is disassembled in parallel with the main welding.

Next, as shown in FIG. 2 (c), for example, 1 is attached to the outer peripheral portion of the connected dome truss portions 10C and 10B.
Eight lift-up vents 23 ... 23 are installed, and the support vent 24 of the ring-shaped dome truss portion 10B is released. After the vent is released, the accuracy is measured, and after making appropriate corrections, the dome truss parts 10C and 10B are hoisted using the center hole jacks 25 ... 25 as in the case of hoisting the central dome truss part 10C. Dome truss section 10C,
Dome truss part A when 10B rises to the specified position
And the position is adjusted to temporarily fix the outermost peripheral member to the dome truss portion A. Adjust the joint of each member and perform main welding. In parallel with this, lift up vent 23.
・ Dismantle 23. Large roof dome truss 10
The entire dome truss parts 10C, 10B and 10A are completed.

Next, as shown in FIG. 2D, the building peripheral wall 5
A winch 27 and a pedestal 28 for lifting up the entire dome truss parts 10C, 10B, 10A are installed on the upper part, and the lift-up vents 22 ... 22 and the dome truss part A of the dome truss parts 10C, 10B are supported. Release the vent. Measure and correct the accuracy after vent opening.
The winch 27 allows the dome truss portions 10C, 10B,
As in the previous step, the entire block 10A is lifted while measuring the reaction force and position during lift-up, and the entire block is fixed to the building peripheral wall 5. Adjustment and main fixing of the main building materials are performed after the whole block is lifted up in order to reduce the lift-up weight and to avoid the effects of deformation in main welding.

Further, as shown in FIG. 3, the basic structure of each dome truss portion 10C, 10B, 10A is constructed by combining steel pipes 12 in a regular triangle shape through a steel joint member 13, It is assembled on a surface plate on earth concrete. The diameter of the steel pipe 12 is 650 [mm], and the diameter of the joint material 13 is 1450 [mm].

The peripheral wall 5 of the building is a dome truss 10A,
10B, 10C during the assembly process (FIG. 2 (a)), or during the connection process of the dome trusses 10A, 10B, 10C (FIGS. 2 (b) (c)), or the dome truss 10A, 1
It may be built during the assembly process from 0B and 10C to the connection process.

[0017]

As described above, according to the construction method of the large roof dome truss of the present invention, the large roof dome truss is divided into a plurality of rings in a plan view, and this is grounded. Since they are assembled, several members can be assembled in parallel at the same time, the use of a large and expensive temporary mount can be omitted, and the construction cost and the construction period can be shortened. . Further, it becomes easy to ensure accuracy and safety by working at a level close to the ground.

Furthermore, since the inner dome truss portion is sequentially lifted up and connected to the outer ring-shaped dome truss portion, the lift-up equipment can be sequentially diverted and the same equipment can be effectively used. Yes, you can master the work step-by-step by lift-up work and carry out the work reliably.
It is possible to secure good finishing accuracy as a whole.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of dividing a large roof dome truss into three parts.

FIG. 2 is an explanatory view showing a construction procedure of a large roof dome truss according to the present invention.

FIG. 3 is a partial plan view showing the structure of a basic grid of a large roof dome truss.

FIG. 4 is an explanatory view showing a construction procedure of a conventional large roof dome truss.

[Explanation of symbols]

 5 Building peripheral wall 10 Large roof dome truss 10A, 10B Ring dome truss section 10C Central dome truss section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toshiharu Kurihara Inventor Toshiharu Kurihara 5-4-1 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo Within Mitsubishi Heavy Industries, Ltd. (72) Hidetoshi Abe 5-4 Wadamiya-dori, Hyogo-ku, Hyogo, Japan No. 1 Mitsubishi Heavy Industries Construction Co., Ltd.

Claims (2)

[Claims] 1. A process of assembling a central dome truss portion and each ring-shaped dome truss portion, which are formed by dividing a large roof dome truss into a ring shape in plan view, and an inner dome truss portion being outside. It is composed of a process of sequentially lifting up and connecting to the ring-shaped dome truss part of the above, and a process of finally lifting up the assembled large roof dome truss onto the peripheral wall of the building. Construction method for large roof dome truss. 2. A process of assembling the central dome truss part and each ring-shaped dome truss part, or a process of connecting the central dome truss part and the ring-shaped dome truss part,
Alternatively, the method for constructing a large roof dome truss according to claim 1, further comprising a step of constructing the peripheral wall of the building during an assembling step and a connecting step of the central dome truss section and each ring-shaped dome truss section. .