JP2000192551A - Construction method for large span frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply reduce a temporary material, and simplify temporary work by completely removing the rotation moments applied to a roof structure outer peripheral part at hanging-up time when lifting up/constructing a roof structure central part. SOLUTION: A roof structure outer peripheral part 1B is constructed on a lower structure 2 constructed on a structure footing 3, support working platforms 4 integrated by a plan view ring-shaped support structure supported on this roof structure outer peripheral part by a bundle member 5 and a diagonal member 6 are arranged in a plurality at intervals in the circumferential direction, lift-up devices 7 are arranged on the respective support working platforms 4, and at the same time, a roof structure central part 1A is constructed on the structure footing 3, a central part 1A is pulled up by the lift-up devices 7, and the central part 1A rising up to a prescribed height is fixed to an outer peripheral part 1B. A height of the support working platforms in a joining part of the outer peripheral part 1B and the bundle member 5 and a distance up to a hanging point of the central part 1A from the joining part are adjusted to offset the two rotation moments acting on the outer peripheral part 1B to make resultant force of vertical reaction and horizontal reaction coincide with the member axis of the outer peripheral part 1B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a large span frame applied when a roof of a stadium or an event hall is lifted up and constructed.

[0002]

2. Description of the Related Art FIG. 6 shows a typical prior art for building a roof structure by lifting it up.

FIG. 6A shows a support gantry 50 provided on a roof structure outer peripheral portion 1B divided from a roof structure central portion 1A, and a lift-up device 7 installed on the support gantry 50. The lift-up device 7 allows the roof structure center 1A to be used.
The vent (temporary support member) 51 is provided below the support gantry 50 so that the rotational moment during the lifting is not imposed on the outer peripheral portion 1B of the roof structure.

FIG. 6B shows a support gantry 60 provided directly above the lower structure 2 for supporting the outer peripheral portion 1B of the roof structure, and the central portion 1A of the roof structure being lifted on the outer peripheral portion 1B of the roof structure. This prevents rotation torque from being applied.

FIG. 6 (c) shows a structure in which the roof structure outer peripheral portion 1B is supported by a cable 70 in order to prevent the roof structure outer peripheral portion 1B from drooping inward. in this case,
In general, the roof structure central portion 1A is pushed up by a jack 71 arranged on the ground.

[0006]

However, in the conventional construction method as described above, in the case of FIG. 6 (a), many temporary materials are required and the temporary work takes time. In the case of FIG. 6 (b), the distance between the suspension point and the support part is increased, so that the support gantry needs to have a strong structure and the connection part between the support gantry and the lower structure needs to be reinforced. There is a problem such as there is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to completely reduce the rotational moment applied to the outer peripheral portion of the roof structure during lifting when constructing the center portion of the roof structure. It is an object of the present invention to provide a method of constructing a large span frame that can be temporarily removed, and that can significantly reduce temporary materials and simplify temporary work.

[0008]

According to the construction method of the present invention, a lower structure is constructed on a structural foundation, and an outer peripheral portion of a roof structure is constructed on the lower structure. On the roof structure, a plurality of support gantry supported by the bundle material and the diagonal material and integrated by a ring-shaped support structure in plan view are provided at intervals in the circumferential direction, and lifts on each support gantry Along with arranging the lifting device, the central portion of the roof structure is constructed on the foundation of the structure, the central portion of the roof structure is pulled up by the operation of the lift-up device, and the central portion of the roof structure lifted up to a predetermined height is covered with the roof. It is characterized by being fixed to the outer peripheral portion of the structure (claim 1).

In the construction method of a large span frame according to claim 1, a height of a support gantry at a joint portion between an outer peripheral portion of the roof structure and a bundle material, and a hanging point from the joint portion to a center portion of the roof structure. By controlling the horizontal reaction force at the joint between the roof structure outer periphery and the bundle material by adjusting the distance to the roof structure, the rotational moment due to the vertical reaction force and the horizontal reaction force is controlled. 2).

In the above structure, a vertical load and a horizontal force are applied to the support gantry by the central portion of the roof structure suspended by the lift-up device, and the vertical load and the horizontal force cause the outer peripheral portion of the roof structure to move. A vertical reaction force and a horizontal reaction force are applied to the joint portion of the bundle of the support gantry. The rotational moment caused by the vertical reaction force and the horizontal reaction force acts in a direction in which the outer peripheral portion of the roof structure is drooped inward by the vertical reaction force and in a direction in which the roof reaction structure is pushed upward by the horizontal reaction force, and acts in directions that cancel each other. As a result, the rotational moment acting on the outer peripheral portion of the roof structure can be removed, and the resultant force of the vertical reaction force and the horizontal reaction force can be directed to the member central axis direction of the outer peripheral portion of the roof structure,
Only an axial force can be applied to the outer peripheral portion of the roof structure.

Further, by adjusting the height of the supporting gantry at the joint between the outer peripheral portion of the roof structure and the bundle and the distance from the joint to the suspension point at the center of the roof structure, the magnitude of the horizontal reaction force is increased. The vertical reaction force and the horizontal reaction force cancel out the rotational moment even if the inclination of the roof structure outer periphery changes, and the combined force of the vertical reaction force and the horizontal reaction force The member can be directed in the central axis direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. This is an example in which the present invention is applied to a circular roof such as a stadium or an event venue. 1 and 2 show a roof structure and a lift-up facility for implementing the construction method of the present invention. 3 and 4 show details of the lift-up facility. FIG. 5 shows the construction method of the present invention in the order of steps.

As shown in FIG. 1 and FIG. 2, the Ochoma structure is mainly composed of a roof structure 1, a lower structure 2, and a structure foundation 3, and in the present invention, the roof structure 1 is divided into a roof structure center portion 1A having a circular shape in plan view and a ring-shaped roof structure outer portion 1B having a ring shape in plan view. 1B
And then, on the structural foundation 3, the center 1 of the roof structure
A is assembled and constructed, and the support gantry 4 is installed on the outer peripheral portion 1B of the roof structure via the bundle member 5 and the diagonal member 6,
The central portion 1A of the roof structure is lifted by the lift-up device 7 disposed on the support gantry 4.

The support gantry 4, the bundle member 5, and the diagonal member 6 are arranged at appropriate intervals in the circumferential direction of the outer peripheral portion 1B of the roof structure. Lumber 9
The support structure is connected by the connecting member 10 and has a polygonal ring shape in plan view (see FIG. 1A).

The lift-up device 7 includes a plurality of bare lock jacks (jacks capable of holding a hydraulic pressure and supporting a load even after jack-up / down) installed on an end of the support gantry 4 on the center side of the structure. And a suspension rod 13 for connecting the lifting member 12 of the jack 11 and a node at the peripheral edge of the roof structure central portion 1A. Suspension rod 13
Is a so-called step bar in which pin holes are drilled at intervals corresponding to the jack stroke. Pins provided above and below the jack device are alternately inserted into the pin holes, and the suspension rod 13 is lifted with the upper pin inserted. Then, after the lower pin is inserted and the upper pin is pulled out, the jack is lowered while the upper pin is pulled out, so that the step bar is pulled up in a so-called scale insect type.

In the above structure, when the roof structure center 1A is lifted by the lift-up device 7, the rotational moment acting on the roof structure outer periphery 1B is improved as follows.

[0017] That is, as shown in FIG. 3, the lift-up device 7 and the support gantry 4, a horizontal force towards the downward hanging load V _a and the structure around by the roof structure center portion 1A H
_a (which is converted into a ring-shaped compression force by the support gantry connected in a ring shape and maintains a balanced state) acts, and the support gantry 4 is connected in a ring shape (polygonal shape),
A vertical reaction force _Vb and a horizontal reaction force _Hb act on the joint between the bundle 5 and the roof structure outer peripheral portion 1B. The vertical reaction force _Vb and the horizontal reaction force _Hb cause the roof structure outer peripheral portion 1B to hang down inward at the joint between the bundle member 5 and the roof structure outer peripheral portion 1B by the vertical reaction force _Vb. a rotation moment M _V of, rotation moment M _H in the direction pushing up the upper works by a roof structure outer peripheral portion 1B horizontal reaction force H _b.

Therefore, by controlling the horizontal reaction force _Hb acting on the joint between the bundle 5 and the outer peripheral portion 1B of the roof structure,
Assuming that M _V = M _H , the rotational moment applied to the outer peripheral portion 1B of the roof structure is offset, and the resultant force of the vertical reaction force _Vb and the horizontal reaction force _Hb is directed toward the central axis of the member of the outer peripheral portion 1B of the roof structure. The force applied to the roof structure outer peripheral portion 1B can be only the axial force.

Assuming that the height of the support gantry 4 is h and the distance from the center of the bundle 5 to the suspension point of the lift-up device 7 is e,
Horizontal reaction force H _a, H _b is represented by _{H a = H b = V a} · e / h, by setting arbitrarily the h and e, they change the slope of the roof structure outer peripheral portion 1B, Roof structure outer periphery 1B
The two rotational moments applied to the roof structure can be offset, and the force applied to the roof structure outer peripheral portion 1B can be made only the axial force. Accordingly, the roof structure outer peripheral portion 1B can be simplified, and the vent (temporary support material) can be greatly reduced (as described later, the vent is used only for the construction of the roof structure central portion 1A). ), And these temporary work can be omitted.

As shown in FIG. 4, the bundle member 5 and the diagonal member 6 of the support gantry 4 are constituted by connecting unit members, or a length adjusting mechanism 14 is provided so that the length can be adjusted. The horizontal reaction force _Hb can be appropriately set according to the inclination of the roof structure outer peripheral portion 1B.

In the above configuration, the lift-up construction of the roof structure 1 is performed in the following procedure (see FIG. 5). (1) As shown in FIG. 5 (i), a lower structure 2 is constructed on a structure foundation 3, and a roof structure outer peripheral portion 1B is constructed on the lower structure 2 by a crane.

(2) As shown in FIG. 5 (ii), a ring-shaped support structure composed of the support gantry 4, the bundle 5 and the diagonal 6 is constructed on the roof structure outer peripheral portion 1B. , Each supporting gantry 4
The lift equipment 7 is installed. During this work, a vent 15 is temporarily provided on the structure foundation 3, and a roof structure central portion 1A is assembled and built thereon. By simultaneously working in this manner, the working efficiency can be naturally increased. When the central portion 1A of the roof structure is large, the bundle 16
And a cable 17 with a cable 17.

(3) As shown in FIG. 5 (iii), the central portion 1A of the roof structure is lifted up to a predetermined height by the lift-up device 7. Next, the roof structure 1 is completed by connecting the roof structure central portion 1A and the roof structure outer peripheral portion 1B with the connecting member 18.

The joint between the central portion 1A of the roof structure and the outer peripheral portion 1B of the roof structure is formed between the case where the roof structure 1 has a truss structure as described above and the case where the roof structure 1 has a steel structure formed of a shaped steel or the like. The structure can be changed. In the case of a steel frame structure, as shown in FIG. 4 (c), the connecting member can be omitted and the vertical cut surfaces can be bolted together via the joint plate 19.

Although the above description has been made with reference to a circular roof of a stadium, an event hall, or the like, the present invention is not limited to this, and the present invention can be applied to a lift-up construction of a roof of a non-circular structure. Further, the support structure is formed in a polygonal ring shape in plan view, but may be circular as long as it is closed in a ring shape.

[0026]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) Since the rotational moment acting on the outer periphery of the roof structure can be completely removed, the number of vents (temporary supporting members) can be greatly reduced, and these temporary operations are also omitted. Can be. Therefore, shortening of a construction period and reduction of cost are achieved.

(2) Only the combined axial force of the load and the horizontal force needs to be considered for the outer peripheral portion of the roof structure, and the outer peripheral portion of the roof structure can be simplified, and its design is clear.
It will be easier.

(3) By making the length of the bundle or diagonal of the supporting gantry adjustable for the purpose of adjusting the rotational moment, the construction plan suitable for the current situation of constructing the structure can be easily made.
In addition, the support gantry can be diverted many times by using standard components.

[Brief description of the drawings]

1A and 1B are a plan view and a front sectional view, respectively, showing a roof structure and a lift-up facility for implementing a construction method according to the present invention.

FIG. 2 is a partial cross-sectional side view of FIG.

FIG. 3 is a front sectional view showing the lift-up equipment of the present invention and the state of action of force.

FIG. 4 is a front sectional view showing a detailed structure of a lift-up facility according to the present invention, wherein (a) and (b) show cases where the roof structure has a truss structure, and (c) shows a case where the roof structure has a steel frame structure.

FIG. 5 is a longitudinal sectional view showing the order of steps in the construction method of the present invention.

FIG. 6 is a front sectional view showing a conventional construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Roof structure 1A ... Roof structure center part 1B ... Roof structure outer peripheral part 2 ... Lower structure 3 ... Structural foundation 4 ... Supporting gantry 5 ... Bundle material 6 ... Diagonal material 7 ... Lift-up device 8 ... Outer ring Material 9 ... Inner ring material 10 ... Connecting material 11 ... Bear lock jack 12 ... Elevating member 13 ... Hanging rod 14 ... Length adjusting mechanism 15 ... Vent 16 ... Bundling material 17 ... Cable 18 ... Connecting material 19 ... Coupling plate

Claims (2)

[Claims] 1. A lower structure is constructed on a structure foundation, a roof structure outer peripheral portion is constructed on the lower structure, and a flat structure supported by a bundle material and a diagonal material is provided on the roof structure. A plurality of support gantry integrated with a ring-shaped support structure are provided at intervals in the circumferential direction, a lift-up device is placed on each support gantry, and the center of the roof structure on the structure foundation And a roof section center is lifted up to a predetermined height by fixing a roof section center section by operating a lift-up device, and the roof section center section is fixed to the roof section outer peripheral section. Construction method. 2. The method according to claim 1, wherein a height of a support gantry at a joint between the outer peripheral portion of the roof structure and the bundle material, and a hanging point from the joint to the center of the roof structure. By controlling the distance to the roof structure, the horizontal reaction force at the joint between the outer periphery of the roof structure and the bundle is controlled to control the rotational moment due to the vertical reaction force and the horizontal reaction force. The construction method of the Ocho-ma frame.