JPH09273225A - Structure construction method of large span frame in large space truss structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build an extremely large span frame by the use of an ordinary crane, reduce altitude works and temporary materials, shorten the construction period, decrease the cost, and improve safety. SOLUTION: The outer circumferential ring 3 and the outermost circumferential ring 2C of a large span frame 2 are built on a foundation 6, a first center part large span frame 2A and at least one intermediate part ring structure 2B are built by assembling on the ground, the first center part large span frame 2A (2-1) is elevated by suspending or the like to the end part connection height and connected to the intermediate part ring structure 2B so as to form a second large span frame 2-2, and the second large stretch frame 2-2 is elevated to the end part connection height by suspending or the like and connected to the outermost circumferential part ring structure 2C. All of 2A, 2B and 2C are provided with constraint mechanism, and by tension of the constrain mechanisms 11, fixed desin dimension is obtained and prestress is introduced to the member.

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 strut structure for constructing a roof of a large space truss structure such as a stadium, a gymnasium, a factory and an exhibition hall.

[0002]

2. Description of the Related Art Conventionally, there are many construction methods and examples of construction methods in which a truss member is assembled in a mesh to form an arch shape or a dome shape. For example, JP-A-4-89
Japanese Patent Application No. 940 or Japanese Patent Application No. 5-3 filed by the applicant.
No. 04550 “Construction method of Ohari frame structure composed of circle or polygon”.

In Japanese Patent Laid-Open No. 4-89940, since the frame structure is constructed by a tension beam, and the end portion of the tension beam and the end portion of the receiving truss are joined by a plate-shaped girder, the ends of the frame structure and the receiving truss are described. Even if the portion is narrowed or the end portion is formed in a shape that extends substantially in the vertical direction, it is possible to join the frame structure and the receiving truss without impairing the transmission of force. However, a large-span frame structure is composed of a truss structure in which a plurality of truss frame members in which upper chord members and lower chord members are connected through a belly member are combined, and the joint end faces of the side portions of the structure and the outer peripheral support member are vertically moved. If the shape along the direction is adopted, problems will occur in the frame shape between trusses and the transmission of axial force, and the joint end face between the side of the frame and the outer peripheral support member will be at a right angle to the slope or curved surface. With such a shape, the end of the outer peripheral support member interferes with both sides of the frame during the lifting process when the frame is lifted up, and the frame cannot be lifted.

Japanese Patent Application No. 5-304550 is a solution to the above-mentioned problems. An outer peripheral support member for supporting a convex oval strut frame having a circular shape or a polygonal shape is constructed, and the outer circumference is formed. The above-mentioned strut frame is built up inside the support member, and the cable is tensioned between the opposite side portions of this strut frame to maintain a predetermined design dimension. Is lifted by a lift-up device, and the outer peripheral end portion of the strut frame is joined to the inner peripheral portion of the outer peripheral support member via a connecting member.

[0005]

The large strut frame frame to which the present invention is applied is an extremely large large strut frame frame, and a crane for constructing the large strut frame frame as a base structure has high lift and large work. A crane with a large radius and a large lifting load is required, work is performed at an extremely high place, and a large amount of temporary materials to support the strut frame is also required. Further, there is a problem that the deformation of the frame becomes significantly large during the process of assembling the extremely large span span.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to make it possible to construct an extremely large strut frame and to construct it using a general crane. It is to provide a construction method for a large span truss structure in a large space truss structure, which can reduce the amount of work in high places and temporary materials, and can shorten the construction period, reduce costs and improve safety. .

[0007]

In order to achieve the above object, in the first aspect of the invention, the outer ring and the outermost ring structure of the straddle frame are constructed on the foundation, and at the same time, On the inner ground, a first central portion of the stretched frame, which constitutes the center portion of the stretched frame, and at least one intermediate ring structure that forms the middle portion of the stretched frame, are constructed. By lifting or pushing up the central taiga frame to the end joint height to connect the outer joint end of the first central taiga frame to the inner joint end of the middle ring structure A second large strut frame is formed, and the second large strut frame is lifted or pushed up to the end joint height, and when there are a plurality of intermediate ring structures, On the frame of Ohari formed with connection Repetition, characterized by finally connecting the outer peripheral joint end portion of the intermediate portion the ring structure on the inner peripheral joining end portion of the outermost periphery ring structure.

According to the second aspect of the present invention, the lower part of the central stretched frame structure, the intermediate ring structure and the outermost ring structure are deformed so that their shapes are designed dimensions.
Alternatively, a restraint mechanism for introducing prestress is provided.

In the third aspect of the invention, the restraint mechanism is left attached even after the construction of the strut frame is completed.
In the fourth aspect of the invention, the restraint mechanism is to be removed after the construction of the strut frame is completed.

In the fifth aspect of the invention, since the outermost peripheral ring structure cannot be jacked down (the other central portion strut frame and the intermediate ring structure can be jacked down by the lift-up device). ), Instead, loosen the restraint mechanism for the outermost ring structure.

In the above-described structure, the taiga span structure is divided into a central taiga frame structure, at least one intermediate ring structure and an outermost ring structure, and the central taiga frame structure and the middle part are divided. After the ring structure is erected, it is assembled by sequentially ascending from the smaller first large span frame to the larger large span frame, and finally the nth large span frame is the outermost part. It is joined to the ring structure to construct the entire span structure. It is possible to construct the Ochan span frame near the ground, and it is possible to construct an extremely large O span frame using a general crane. Also, work at high places is reduced, and temporary materials are also reduced.

By providing the restraint mechanism, the tension of the restraint mechanism allows the shape of the frame to always have a designed size, and prestress can be introduced into the structural member.

When the restraint mechanism is still attached, the strength of the frame can be maintained as a shell structure of the straddle frame. Further, by loosening the restraint mechanism of the outermost peripheral ring structure, it becomes possible to transmit and couple the axial force of the final structural member of the entire strut frame.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. 1 to 4 show, in order, sectional construction views of the construction method of the Ootari frame structure of the present invention, and FIG. 6 and 7 show a plan view of the taiga span frame in the first step and a plan view of the taiga span frame after the construction is completed.

As shown in FIGS. 4 and 7, the large space truss structure 1 is an ellipse or an ellipse in plan view, and is an extremely large structure. The large space truss structure 1 is an upper chord member,
A dome-shaped large span structure 2 in which lower chord members and abdominal members are assembled in a mesh shape in a plan view, and an outer peripheral ring 3 that constitutes the outermost peripheral portion.
And a lower structure 5 that supports the outer peripheral ring 3 through the columns 4. The strut frame 2 is concentrically divided into three parts in a plan view, and is composed of a central strut frame 2A, a middle ring structure 2B, and an outermost peripheral ring structure 2C in order from the center.

The large space truss structure 1 as described above is constructed by the following procedure.

(1) As shown in FIG. 1, FIG. 5 (i) and FIG. 6, a lower structure 5, pillars 4 and outer peripheral ring 3 are constructed on a foundation 6, and on the foundation 6 and the lower structure 5. Assemble a number of vents 7 on the
A, middle ring structure 2B, outermost ring structure 2
Build C at the same time. The outermost peripheral ring structure 2C is constructed at a design height position using a large crawler crane 8 and a crawler crane 9, and the outermost peripheral part thereof is connected to the outer peripheral ring 3. The center-portion stretchable frame 2A and the intermediate-portion ring structure 2B are constructed (ground) near the ground using the crawler crane 10. It should be noted that the roof material is finished on the central stretched frame 2A, the intermediate ring structure 2B, and the outermost ring structure 2C.

(2) In the assembled state shown in FIG. 1, a large number of restraint mechanisms 11 are attached to the lower portions of the central stretched frame structure 2A, the intermediate ring structure 2B, and the outermost peripheral ring structure 2C. As shown in FIGS. 8 (a) and 8 (b), the restraint mechanism 11 is provided inside (in the case of 2A) or inner peripheral end portions (2B, 2C) of the strut frame.
In the case of), a bundle member 12 hung vertically from the lower surface, a frame member 13 such as a cable or a steel frame for connecting the lower end portions of the bundle member 12, and three points on the lower surface at the outer peripheral end of the strut frame. A support member 14 having a bifurcated shape in plan view, and pulley groups 15, 16 provided at the lower end of the bundle member 12 and the tip of the support member 14.
And a tension cable 17 having one end attached to the bundle 12 and wound around the pulley group, and the other end wound around the winch 18 on the foundation 6. The bundles 12 are provided at the same circumferential mark positions, the frame 13 constitutes a polygonal frame body in a plan view, and the tension cables 17 and the support 14 are radially arranged.

(3) A large number of lift-up devices 20 are set on the upper surfaces of the inner peripheral portions of the intermediate ring structure 2B and the outermost peripheral ring structure 2C. This lift-up device 2
As shown in FIG. 9, 0 is composed of a pair of jacks 21, a lifting rod 22, and a support stand 23. Jack 2
Reference numeral 1 is, for example, a center hole jack, and the lifting rod 22 is alternately gripped by the upper and lower gripping mechanisms to move the jack 21 up and down to make a straddle frame connected to the lower end of the lifting rod 22 in a length scale type. It is a lifting device that raises. In addition, this lifting device is a lift-up device 20.
The device is not limited to this, and may be a device that pushes up from below.

(4) Restraint mechanism 11 of the central stretched frame 2A
After tensioning the tension cable 17 of No. 2, the central portion of the tensioned frame 2A has a predetermined design shape, or after prestressing is introduced into its structural member, as shown in FIGS. 2 and 5 (ii), The partial O-bari frame 2A (the first O-bar frame 2-1) is raised by the lift-up device 20 of the intermediate ring structure 2B, and the outer peripheral end 2a and the intermediate ring of the central O-bar frame 2A. When the heights of the inner peripheral end 2b of the structure 2B match, the rising is stopped and the outer peripheral end 2a and the inner peripheral end 2b are joined. The lift-up device 20 slightly lifts down the central tension frame 2A to form a second tension frame 2-2 (2A + 2B). The lift-up device 20 is disassembled and removed from the middle ring structure 2B. The lift-up device 20 may be used as a lift-up device for the outermost peripheral ring structure 2C in the next step.

(5) As shown in FIG. 3, by tensioning the tension cable 17 of the restraint mechanism 11 of the intermediate ring structure 2B, the intermediate ring structure 2B is curved and deformed into a predetermined design shape. Alternatively, after the prestress is introduced into the structural member, the second Ohari frame 2-2 (2A + 2
B) is a lift-up device 2 for the outermost ring structure 2C
When the height of the outer peripheral end 2c of the second strut frame 2-2 and the height of the inner peripheral end 2d of the outermost peripheral ring structure 2C match, the rise is stopped and the outer peripheral end 2c is stopped. And the inner peripheral end 2d are joined. By slightly lifting down the second Ootari frame 2-2 by the lift-up device 20, as shown in FIG.
5 (iii) and 7 shown in FIG.
C) is formed. Lift-up device 2 on the Oharima frame
0 is dismantled and removed.

(6) As shown in FIG. 4, the vent 7 is disassembled, and the central stretched frame 2A, the intermediate ring structure 2B,
The tension of each tension cable 17 of the outermost peripheral ring structure 2C is released. Since the outermost peripheral ring structure 2C cannot perform the above-mentioned lift down, the tension is released instead. By releasing this tension, the final structural members of the entire strut frame 2 are joined, and by connecting all the structural members, it becomes possible to couple the axial force as the strut strut frame.
Construction of the Oharima frame 2 is completed, and the large space truss structure 1 is completed. The restraint mechanism 11 may be left attached or may be removed. When the restraint mechanism 11 is left, the span structure 2 becomes a shell structure, which further contributes to maintaining the strength of the structure.

In the above embodiment, the joint ends 2a to 2d are shown as vertical planes parallel to each other in the vertical direction. However, as shown in FIG. 10, a plane perpendicular to the curved surface of the strut frame is shown. And an appropriate gap is provided between these joint end faces, and the connecting member 3
It is also possible to join via 0. With such a structure, the axial endurance can be improved by eliminating the joint end face that is parallel to the vertical direction, and the joint end face does not interfere during the ascending process. You can

It should be noted that although the example in which the Ootari frame is divided into three parts has been described, it is needless to say that the construction method of the present invention can be applied to the case of four or more parts.

[0025]

As described above, according to the present invention, the large strut frame is divided into a plurality of frames, and the grounded first central strut frame is lifted and connected to the grounded intermediate ring structure. As a result, the second large strut frame was formed and finally connected to the outermost ring structure, and the small large strut frame was constructed gradually to the larger large strut frame. It produces such an effect.

(1) It becomes possible to construct an extremely large span span structure which was impossible in the past.

(2) It is possible to construct a large-scale large span frame using a relatively small general crane.

(3) A large-scale large span frame can be constructed almost on the ground, work in high places is reduced, and temporary materials such as vents are also reduced.

(4) From the above, it is possible to shorten the construction period, reduce the cost, and improve the safety when constructing a large-scale large span frame.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first step of a construction method for a span span structure according to the present invention.

FIG. 2 is a cross-sectional view showing a second step of the construction method for the Ootari frame structure according to the present invention.

FIG. 3 is a cross-sectional view showing a third step of the construction method for the Ootari frame structure according to the present invention.

FIG. 4 is a cross-sectional view showing a fourth step of the method for constructing a stretchable frame structure according to the present invention.

FIG. 5 is a side view showing in sequence the method of constructing a span span structure according to the present invention.

FIG. 6 is a plan view showing a first step of the construction method for the Ootari frame structure according to the present invention.

FIG. 7 is a plan view showing a state after completion of construction of the Ootari frame according to the present invention.

8 (a) is a plan view and FIG. 8 (b) is a perspective view showing a restraint mechanism of a strut frame according to the present invention.

FIG. 9 is a perspective view showing a lift-up device for a strut frame according to the present invention.

FIG. 10 is a schematic cross-sectional view showing a modified example of the joint end portion of the strut frame structure according to the present invention.

[Explanation of symbols]

 1 ... Large space truss structure 2 ... Large strut frame 2A ... Center strut strut frame 2B ... Middle ring ring structure 2C ... Outermost ring ring structure 3 ... Outer ring 4 ... Strut 5 ... Lower structure 6 ... Foundation 7 ... Vent 8, 9, 10 ... Crawler crane 11 ... Restraint mechanism 12 ... Bundle material 13 ... Frame material 14 ... Support material 15, 16 ... Pulley group 17 ... Tension cable 18 ... winch 20 ... lift up device 21 ... jack 22 ... lifting rod 23 ... support stand

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Mukai 6-2-10 Ginza, Chuo-ku, Tokyo Within Tomoe Corporation (72) Ryo Muranaka 6-2-10 Ginza, Chuo-ku, Tokyo Stock Company, Tomoe Corporation

Claims (5)

[Claims] 1. A first central part which constructs an outer peripheral ring and an outermost peripheral ring structure of a strut frame on a foundation and constitutes a central part of the strut frame on the ground inside these structures. Constructing the taiga span frame and at least one intermediate ring structure that constitutes an intermediate part of the taiga span frame, and lifting or pushing up the first central taiga span frame to the end joint height. The second outer strut frame is formed by connecting the outer circumferential joint end of the first central portion strut frame to the inner circumferential joint end of the intermediate ring structure. Is lifted to the end joint height by lifting or pushing up, and if there are multiple intermediate ring structures, the intermediate ring structures are repeatedly connected and the formed tension span frame is repeatedly raised until the intermediate part The outer peripheral joint end of the ring structure is the outermost peripheral portion. A construction method for a large span frame in a large space truss structure characterized by connecting to the inner peripheral joint end of a ring structure. 2. The method for constructing a stretched frame structure according to claim 1, wherein the shape of the center stretched frame structure, the middle ring structure and the outermost ring structure is lower than the design size. A construction method for a large span truss structure in a large space truss structure, characterized by being provided with a restraint mechanism for deforming or introducing prestress. 3. The method of constructing a large span frame according to claim 2, wherein the restraint mechanism remains attached even after the construction of the large span frame is completed. Construction method of frame. 4. The construction method for the Ootari frame structure in a large space truss structure according to claim 2, wherein the restraint mechanism is removed after completion of the construction of the Ootari frame structure. . 5. The construction method for a large span strut frame in a large space truss structure according to claim 2, wherein the restraint mechanism of the outermost ring structure is loosened.