JP2877286B2 - Construction method of large roof dome truss - Google Patents

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 FIG. 4 shows a construction method for constructing a large roof dome. That is, 1 in step 1
At the step 2, the upper frame and the steel frame are assembled and joined toward the center by using a tower crane, a crawler crane, etc. from the outer periphery at the ground level. In the middle part, the frame units 111... 111 assembled on the rotary frame 101 are sequentially rotated in the direction of the erection range, and the large-sized roof dome truss 100 is completed in step 3. In step 4, a lift-up machine 103 such as a center hole jack is provided on the peripheral wall 105 of the building.
Then, the dome truss 100 is lifted up and fixed on the peripheral wall 5 of the building by the lift-up machine 103, and completed as shown in Step 6.

[0003]

However, in the conventional method as described above, the temporary gantry 101 to be rotated and moved needs to have a large scale and sufficient rigidity, which increases the cost and increases the roof dome truss. It is difficult to secure a work place for the crane in the erection stage of the central part of the city. In addition, when the entire roof dome truss is divided into an outer peripheral part, an intermediate part, and a central part in a plan view, a movable scaffold can be used only for the intermediate part in a rotationally movable frame, and for other parts Is a reasonable construction method using a conventional assembly / disassembly scaffold. In addition, there have been problems such as the necessity of special measures for countermeasures in the event of an earthquake during the construction of the middle part and the central part, which are gradually rising.

The present invention has been devised in view of the above-mentioned problems of the conventional construction method. The construction cost can be reduced by reducing the number of temporary members, and it is easy to secure a place for work by a crane.
An object of the present invention is to provide a construction method for a large-sized roof dome truss that can ensure the safety of construction work during an earthquake or the like.

[0005]

A construction method of a large-sized roof dome truss according to the present invention, which achieves the above object, comprises a central dome truss in which a large-sized roof dome truss is divided into a plurality of rings in plan view. And a process of assembling each ring-shaped dome truss on the ground, a process of sequentially lifting up and connecting the inner dome truss to the outer ring-shaped dome truss, and finally forming a large roof dome truss. And a step of lifting up on the peripheral wall of the building.

[0006] The above construction can include a step of building the peripheral wall of the building during the assembling step and / or the connecting step of the center and ring-shaped dome trusses.

[0007]

In the construction method of the large-sized roof dome truss having the above structure, the large-sized roof dome truss is divided into a ring shape in a plan view, for example, into three parts such as an outer peripheral part, an intermediate part, and a central part. As a result, some of them can be assembled simultaneously with a crane and a low scaffold, so that a large and expensive hypothetical stand is not used, so that the construction cost can be reduced and the construction period can be shortened. In addition, since the inner dome truss is sequentially lifted up and connected to the outer ring-shaped dome truss, it is possible to expect proficiency in work and reliable work progress. The large-sized roof dome truss that is finally assembled has good finishing accuracy, and even if it is lifted up on the peripheral wall of the building as in the past, the installation work is easy and the lift-up equipment can be used effectively. Furthermore, the erection and assembly of the divided basic parts can be performed at a level close to the ground, and it is easy to ensure accuracy and safety.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a construction method of a large roof dome truss according to the present invention.

FIG. 1 is a plan view showing an example of dividing a large-sized roof dome truss according to the present invention into three parts, FIG. 2 is an explanatory view showing a construction procedure of the large-sized roof dome truss, and FIG. It is a partial plan view showing a 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-sized roof dome truss 10 is viewed in plan.
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.
It is divided into 0C and assembled on the ground. The ground is reinforced with concrete between the ground to withstand the load of cranes and vents.

As shown in FIG. 2 (a), first, a ring-shaped dome truss portion 10A and a ring-shaped dome truss portion 10B are assembled from the outer periphery and the center by using a crawler crane. Assemble using The assembling is performed while measuring the position of each node at night when the air temperature is constant, and while performing accuracy control on the assembling shape of the dome truss part in advance based on deformation by its own weight in advance. Each dome truss part 10A, 10B, 10C
, A hanging scaffold to be used later for attaching a roofing material is attached. Also, a purlin for mounting 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 with a clamp or the like for accuracy adjustment, so that the connecting operation between subsequent blocks can be performed smoothly.

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 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 actuated, and the lifting position is measured using a surveying instrument. The central dome truss portion 10C is connected to the ring-shaped dome truss portion 10B under computer control by a data logger. The joints of the facing members of the dome truss portions 10C and 10B are adjusted and connected by performing main welding. The lift-up vent 21 is dismantled in parallel with the main welding.

Next, as shown in FIG. 2 (c), for example, the outer periphery of the connected dome truss portions 10C and 10B
Eight lift-up vents 23 are set, 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 the correction is appropriately performed. Then, the dome trusses 10C and 10B are lifted using the center hole jacks 25... 25 similarly to the lifting of the center dome truss 10C. Dome truss part 10C,
When 10B rises to a predetermined position, dome truss part A
The gap is measured and the position is adjusted, and the outermost member is temporarily fixed to the dome truss portion A. Adjust the joint of each member and perform the main welding, and in parallel with this, lift-up vent 23
・ ・ Dismantle 23. With this, large roof dome truss 10
Of the entire dome truss portion 10C, 10B, 10A is completed.

Next, as shown in FIG.
A winch 27 and a gantry 28 for lifting up the entire dome truss portions 10C, 10B, 10A are installed thereon, and the lift-up vents 22 ... 22 of the dome truss portions 10C, 10B and the dome truss portion A are supported. Release vent. Measure and correct the accuracy after vent release.
Dome truss parts 10C, 10B by winch 27,
The entire block 10A is lifted while measuring the reaction force and position during lift-up as in the previous step, and the entire block is fixed to the building peripheral wall 5. Adjustment of the purlin material and final fixing are performed after the entire block is lifted in order to reduce the weight of the lift-up and to avoid the influence of deformation in the main welding.

As shown in FIG. 3, the basic structure of each dome truss portion 10C, 10B, 10A is formed by combining steel pipes 12 in a regular triangular shape via a steel connection member 13. Assembled on a surface plate on clay concrete. The diameter of the steel pipe 12 is 650 [mm], and the diameter of the connection member 13 is 1450 [mm].

The building peripheral wall 5 includes a dome truss 10A,
10B and 10C during the assembling process (FIG. 2A), or during the connecting process of the dome trusses 10A, 10B and 10C (FIGS. 2B and 2C), or the dome trusses 10A and 1C.
What is necessary is just to build during the connection process from the assembly process of 0B, 10C.

[0017]

As described above, according to the construction method of the large-sized roof dome truss of the present invention, the large-sized roof dome truss is divided into a plurality of rings in plan view, and this is divided on the ground. Since the components are assembled, several members can be assembled simultaneously in parallel, so that the use of a large and expensive temporary gantry can be omitted, thereby reducing the cost and shortening the construction period. . In addition, it is easy to secure accuracy and safety by working at a level close to the ground.

Further, 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 equipment can be used effectively. Yes, it is possible to gradually master the work by lift-up work
Good finishing accuracy can be ensured as a whole.

[Brief description of the 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-sized roof dome truss according to the present invention.

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

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

[Explanation of symbols]

 5 Perimeter wall of building 10 Large roof dome truss 10A, 10B Ring-shaped dome truss part 10C Central dome truss part

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiharu Kurihara 5-4-1, Wadamiya-dori, Hyogo-ku, Kobe-shi, Hyogo Inside Mitsubishi Heavy Industries, Ltd. No. 1 Inside Mitsubishi Heavy Industries, Ltd. (56) References JP-A-4-176931 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 21/14

Claims (2)

(57) [Claims] A step of assembling a central dome truss part and each ring-shaped dome truss part in a shape obtained by dividing a large roof dome truss into a plurality of rings in plan view; It is characterized by comprising a process of sequentially lifting up and connecting to the ring-shaped dome truss part of the above, and a process of lifting up the large roof dome truss finally assembled on the surrounding wall of the building Large roof dome truss construction method. 2. During the assembling process of the central dome truss portion and each ring-shaped dome truss portion, or during the connecting process of the central dome truss portion and the ring-shaped dome truss portion,
2. The method for constructing a large-sized roof dome truss according to claim 1, further comprising a step of building the peripheral wall of the building during an assembling process and a connecting process of the central dome truss portion and each ring-shaped dome truss portion. .