JPH07139037A - Cable tension introducing method for dome roof frame - Google Patents

Abstract

PURPOSE:To reduce construction cost and to simplify tension control by facilitating tension introducing work, and to execute a tension introducing work simply and surely in the interior of a roof frame, the whole of which can be easily grasped. CONSTITUTION:As a tension introducing method for a cable, a connecting part where a bundle material T, a circumference cable 11a, and a radial cable 11b are concentrated to be put in the connecting state is remarked, the length of the radial cable 11b is previously set shorter, and the inner end part of the radial cable 11b and the lower end of the bundle material T are connected to each other by a connecting device S. After that, the connecting device S part and the circumference cable 11a are drawn nearer to each other by a jack 45 and connected to each other to introduce tension into the cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable tension introducing method for a dome type roof frame applied to athletic facilities such as baseball fields and soccer fields, or other large-scale facilities.

[0002]

2. Description of the Related Art In recent years, large-scale fixed dome type roofs have been adopted for indoor sports facilities. Steel truss structure, cable structure, stringed beam structure and the like are known as the structural types of the fixed dome type roof.

In the above-mentioned steel frame truss structure, the multi-layer truss dome in which the constituent steel aggregates are connected in the form of a multi-layer truss to obtain relatively good structural stability, and the structure steel aggregate shown in FIG. 21 are connected in the form of a plane truss. However, the multi-layer truss dome has various problems in terms of an increase in construction cost for obtaining the structural stability of the roof, a longer construction period, and the like. Therefore, the single-layer truss dome 1 is advantageous in terms of weight reduction, construction cost reduction, and construction period reduction.
May be adopted.

On the other hand, in the cable structure as a fixed dome type roof, as shown in FIG. 22, a large number of radiation cables 2 and 3 are arranged as a plurality of upper chord members and lower chord members. The cable 2 having a structure in which the bundle 4 is supported in a vertical arrangement in between, and the cable 2 in which a large tension is introduced in the outer peripheral direction is the dome boundary portion (the outer peripheral portion of the dome roof).
The structure is fastened to the compression ring 5.

By the way, the single-layer truss dome 1 described above is used.
Has a problem in terms of buckling proof strength of the dome constituent material that is easily collapsed due to an unbalanced load such as snow, and the dome boundary structure has a large thrust (single layer) applied to the dome boundary in the direction of arrow A. A strong tension ring 6 to handle the internal force of the dome that supports the entire dome.
Therefore, there is a problem that the construction cost for constructing the tension ring 6 and the outer peripheral structure for supporting the tension ring 6 increases significantly.

Also, in the above-mentioned cable structure,
Since the flexible cables 2 and 3 have a flexible structure in which they are constituent members, a large prestress is required for the cable 2 in order to enhance structural stability. Therefore, contrary to the single-layer dome 1, the dome boundary member has to be a strong compression ring 5 against a large thrust load in the direction of arrow B, and the compression ring 5 and the outer peripheral structure supporting the compression ring 5 are constructed. There was a problem that the construction cost required for the

Therefore, the applicant of the present invention, so-called "suspend dome", combines a single-layer truss dome and a cable dome to form a hybrid structure.
A structure that compensates for the drawbacks while effectively exerting the advantages of the single-layer truss dome roof frame and the cable type dome roof frame, thereby significantly reducing the weight and the thrust load applied to the outer peripheral boundary of the main frame. The dome type roof structure (Japanese Patent Application No. 5 -18
1659) has already been proposed.

[0008]

However, in such a dome type roof frame of various structural types, in particular,
In a dome type roof frame structure using cables such as a cable dome structure, a suspension / dome structure, or a string beam structure, it is necessary to introduce tension to many cables that make up the roof frame structure. There were the following issues. That is, as the tension introduction work, for example, in a cable dome or a suspension dome, a method is used in which tension is introduced by pulling a large number of radiation cables positioned on the outer peripheral portion of the roof frame from the outer peripheral structure side with a jack. However, the number of jacks to be used is the same as the number of radiating cables, so that there is a problem that the cost for introducing the tension becomes large. In particular, in the case of a structure such as a cable dome that has a large number of cables to which tension is introduced, and where there are multiple points where tension is overlapped or intersects, it is important to introduce tension to the cable. It was a problem. In addition, there is a problem that it is difficult to grasp the entire roof frame necessary for the work by the method of introducing the tension by the jack from the outer peripheral part of the roof frame such as a cable dome.

The present invention has been made in consideration of the above points, and as a method for introducing tension into a cable, attention has been paid to a connecting portion where the bundle material, the circumferential cable and the radiation cable are concentratedly connected. , The length of the radiation cable is set to be short in advance, and the inner end of the radiation cable and the lower end of the bundle are connected by using a connecting device, and then the connecting device portion and the circumferential cable are connected. The method is to introduce tension to the cable by pulling them with a jack and connecting them to each other.This makes it easy to introduce the tension to reduce the construction cost, simplify the tension management, and make the cable tension uniform. Furthermore, the present invention intends to provide a cable tension introducing method for a dome-type roof frame that can easily and surely perform the tension introducing work inside the roof frame which makes it easy to grasp the entire roof frame. .

[0010]

The invention according to claim 1 is
A dome-shaped main frame that is erected on the outer peripheral structure for supporting the roof, a reinforcing frame that is arranged on the lower surface side of the main frame to reinforce the main frame, and the lower end is connected to this reinforcing frame. A bundle member whose upper end is connected to the main frame, and at least the reinforcing frame of the main frame and the reinforcing frame is annularly arranged so as to be located inside the outer peripheral ring of the main frame. A cable tension introducing method for a dome type roof frame composed of a circumferential cable and a plurality of radiating cables stretched between the circumferential cable and the outer boundary ring of the main frame, wherein The length of the cable is set short, and the inner end of this radiation cable and the lower end of the bundle are connected using a connecting device, and then the connecting device portion and the circumferential cable are jacked. Attract each other It is characterized by introducing a tension to the cable by connecting.

The invention according to claim 2 is the cable tension introducing method for a dome type roof frame according to claim 1, wherein the connecting device is a universal joint mechanism at a connecting portion between a circumferential cable and a radiation cable. It is characterized by having.

[0012]

In the cable tension introducing method for the dome type roof frame according to the first aspect of the present invention, the length of the radiating cable is set to be short in advance, so that the tension introducing margin is formed in the cable. Then, the inner end of the radiation cable and the lower end of the bundle are connected using a connecting device, and then the connecting device portion and the circumferential cable are pulled together by a jack to connect them to each other. Great tension is introduced in the radiating and circumferential cables. At this time, since the lower end of the bundle is connected to one end of the radiating cable and the upper end is connected to the main frame, the upward axial force of the bundle is increased in the process in which tension is introduced into the cable that constitutes the reinforcing frame. Occurs, and this axial force acts as a force to push the main frame upward. That is, when a large tension is introduced into the cable forming the reinforcing frame by the jack, this tension acts as a reaction force that pushes up the main frame via the bundle material.

In the cable tension introducing method for the dome type roof frame according to claim 2, since the connecting device is provided with a universal joint mechanism at a connecting portion between the circumferential cable and the radiation cable, the universal joint mechanism is provided. This effectively prevents twisting or bending between the circumferential cable and the radiation cable, which tends to occur when the tension is introduced by the jack.

[0014]

EXAMPLE An example of a cable tension introducing method for a dome type roof frame according to the present invention will be described below with reference to FIGS. The embodiment shown in the figure shows an example in which the cable tension introducing method for a dome type roof frame according to the present invention is applied to a dome type roof frame "suspension dome" having a hybrid structure by combining a single-layer truss dome and a cable dome. Before describing the cable tension introducing method according to the present invention, first, the structure of the dome type roof frame structure shown in these drawings will be described.

The dome type roof frame in the illustrated example is a main frame 10 (see FIG. 1 and FIG. 2) which is curved upward in side view and is constructed in a circular shape in plan view to cover a large-scale facility. The multi-story truss portion 18 (see FIG. 3) integrally constructed in the central portion of the frame 10, the reinforcing frame 11 (see FIGS. 4 and 6) that reinforces the main frame 10, and the lower end of the reinforcing frame 11 are connected to each other. And a plurality of bundles T whose upper ends are connected to the main frame 10 (see FIGS. 6 and 9 to 11).

The main frame 10 has a diameter of 200 m and a height of 3 and is constructed by connecting a plurality of steel aggregate members to each other in a plane truss shape.
It is a lattice type structure of about 0 m (rise / span ratio 0.15). That is, as shown in FIG. 1, a plurality of outer peripheral members 1 are provided on the outer peripheral edge of the main frame 10 formed in a circular shape in plan view.
The two are joined together to form a peripheral boundary ring 13.

Further, inside the outer peripheral boundary ring 13, a plurality of circumferential members 15 are joined to each other while gradually reducing the diameter with the outer peripheral boundary ring 13 and the center P of the circle aligned. Inner circumferential circles 14a, 14b ... Are formed. Further, the inner circumferential circles 14a, 14b, ... Are provided in a form in which the height gradually increases toward the center P of the circle.

Further, in the radial direction passing through the circle center P of the outer peripheral boundary ring 13, a plurality of radiators 16 are joined to each other with the height gradually increasing toward the circle center P. The radiators 16 are joined in the radial direction on the circle center P side, but are gradually joined in the circumferential direction toward the outer peripheral boundary ring 13 side.

By connecting the outer peripheral member 12, the peripheral member 15 and the radiating member 16 to each other, the main frame 10 which is curved upward in a circular shape in plan view and has a circular opening 17 at the center of the upper portion thereof is formed. It is configured. The outer peripheral boundary ring 13 provided on the outer periphery of the main frame 10 described above is a thrust F generated in the outer peripheral edge of the main frame 10 in a side view arrow direction.
It has a structure that bears 1 (force to push the facility supporting the main frame).

On the other hand, the reinforcing frame 11 is arranged integrally with the main frame 10 below the main frame 10. That is, as shown in FIGS. 4 to 6, the reinforcing frame 11 has a circumferential cable 11a formed in a ring shape having a diameter smaller than that of the outer circumferential boundary ring 13 of the main frame 10, and the circumferential cable 11a and the outer circumferential boundary. A plurality of radiation cables 1 stretched between the rings 13
1b ...

In the embodiment, the ring diameter (diameter) of the circumferential cable 11a is substantially the same as the diameter of the inner circumferential circle 14a located inside the outer circumferential boundary ring 13 of the main frame 10. Therefore, the upper end of each bundle T has the circumference member 15 and the radiation member 16 on the inner circumference circle 14a.
It is configured to be rotatably connected to the joint portion B with the.

As shown in FIGS. 5 and 6, the reinforcing frame 11 having the above structure is constructed by being assembled on the inner surface side of the main frame 10 with the centers of the main frame 10 aligned with each other. . At that time, the upper end of each bundle T is connected to the main frame 10
And the lower ends thereof are connected to the intersections of the circumferential cable 11a and the radiation cable 11b by using a connecting device described later, and the outer ends of all the radiation cables 11b are As shown in FIG. 7, it is fastened to the outer peripheral boundary ring 13 of the main frame 10.

FIGS. 7 and 8 show an example of a support structure (peripheral support structure) for the outer peripheral boundary ring 13 of the main frame 10. The outer peripheral structure is a lower structure for supporting the outer peripheral boundary ring 13 portion. It is supported via a pin roller mechanism 20 provided between the upper part of K and the outer peripheral boundary ring 13. The pin roller mechanism 20 includes an outer boundary ring 13
An upper shoe 21 integrally provided with the lower shoe 22, a lower shoe 22 provided on the outer peripheral structure K, and a bearing plate 23 interposed between the upper shoe 21 and the lower shoe 22.
And a peripheral boundary ring 13
Is supported by the outer peripheral structure K in a form of radial direction free and circumferential pin support. In FIG. 8, reference numeral 24 indicates a stopper for preventing the outer peripheral boundary ring 13 from rising.

In the present embodiment, the lower end of the bundle T is connected to a connecting device S for connecting the circumferential cable 11a and the radiation cable 11b, as shown in FIG.
This connecting device S has a cylindrical main body 3 whose upper surface is closed.
0, the lower end of the bundle T is hinged to the pair of brackets 31 protruding from the upper surface of the main body 30 so as to be vertically rotatable via bolts 31a.

Radiation brackets 32, 32 extending radially from the outer peripheral surface of the main body portion 30 are respectively provided so as to project therefrom.
As shown in, the inner end of the radiation cable 11b is hinge-coupled via a pair of connecting plates 33, 33 and bolts 34, 34. Further, turnpacks 35, 35 for adjusting the length of the radiation cable 11b are provided in the middle of the radiation cable 11b.

Further, the body portion 30 has a circumferential cable 11
The clamp 36 for connecting a is a universal joint mechanism 37.
It is provided so as to be rotatable around the horizontal axis and the vertical axis via. The clamp (fulcrum metal fitting) 36 has a pair of holding plates 36a, 36a for holding (friction joining) the pair of circumferential cables 11a, 11a sandwiched therebetween, and both holding plates 36a, 36a integrally. Bolts and nuts for fixing 3
6b and has a through hole 36c in the center.
Is provided.

Inside the cylindrical main body 30, horizontal slidable plates 37a extending in the radial direction of the main body 30 are screwed from the outer peripheral portions of the main body 30 facing each other in the diametrical direction. It is attached by 37b and 37b, and is provided so as to be rotatable in the up-down direction with these lateral bolts as a rotation axis. The connecting rod 37c is connected to the horizontal sliding plate 37a.
Is rotatably provided in the left-right direction with a vertical bolt 37d provided in a form penetrating in the plate thickness direction of the horizontal sliding plate 37a, and further allows the main body portion 30 to rotate the connecting rod 37. A notch 38 is provided to allow the connecting rod 37 to rotate about the horizontal axis and the vertical axis, thereby forming the universal joint mechanism 37. Therefore, the clamp 36 is fitted into the connecting rod 37c by utilizing the through hole 36c of the clamp 36, and the nut 3 is not attached.
It is attached by 7e.

As will be described later, a pull-in rod 39 is connected to the end portion of the connecting rod 37c so as to use it as an operating rod of the center hole jack when the cable tension is introduced by the jack. Although there are various connection structures, for example, a threaded hole extending in the axial direction is provided at the end of the connection rod 37c, and a male screw to be screwed into this threaded hole is provided at the outer periphery of the end of the retracting rod 39 so as to be detachable. The method of connecting to is adopted.

A method of introducing cable tension to the reinforcing frame 11 of the dome type roof frame having the above structure will be described below.

(Step 1) First, as shown in FIG. 13, the upper ends of the bundles T are connected to the main frame 10 that has been erected and suspended. In that case, a platform 40 that serves as a workbench or a scaffold is installed. (Step 2) As shown in FIG.
On the upper part, members and jigs required for cable connection such as the connection device S and the circumferential cable 11a are temporarily placed.

(Step 3) As shown in FIG. 15, the connecting device S is placed directly below the bundle T, and the adjusting table 41 is provided as necessary.
The upper and lower positions of the connecting device S are adjusted by using, and the lower end of the bundle T is attached to the pair of brackets 31 on the upper surface of the connecting device S by a bolt 31a
Connect by. And clamp 3 to the connecting rod 37c
The nut 37e for fixing 6 is screwed, and the nut 37e is further connected to the connecting rod 37c and the pulling rod 39.
e is sufficiently loosened and it is slidably placed on the retracting rod 39.

(Step 4) As shown in FIG. 16, the outer ends of all the radiation cables 11b having the turn puckles 35 for length adjustment are fixed to the outer peripheral boundary ring 13 of the main frame 10, respectively. The inner ends are respectively connected to the connecting devices S. Then, the turn puckle 35 is tightened to shorten the length of each radiation cable 11b in advance, and the bundle T
Is inclined toward the radiation cable side, whereby an introduction margin necessary for introducing cable tension is formed in advance.

(Step 5) As shown in FIG. 17, the center hole jack 45 having the pull-in rod 39 as an operating rod is set, and a cylindrical member serving as a pressure supporting member is provided between the center hole jack 45 and the clamp 36. The ram chair 39a is attached and the cable tension introduction preparation is performed. In this case, the center hole jacks 45 are set at all the connection points of the inner end of the radiation cable 11b, the lower end of the bundle T, and the circumferential cable 11a to prepare for the cable tension introduction.

(Step 6) As shown in FIG. 18, when the center hole jacks 45 are operated synchronously and the retracting rod 39 is sequentially retracted, the main body 30 of the connecting device S and the clamp 36 gradually approach each other. By this, a large tension is gradually introduced into the circumferential cable 11a and the radiation cable 11b. Then, the main body portion 30 of the connection device S
The target tension is introduced when the clamp 36 and the clamp 36 approach each other as shown in FIG. At this time, the bundle T is in a vertical state, and an upward axial force is generated in the bundle T during the transition of the bundle T from the inclined state to the vertical state, and this axial force acts as a force for pushing up the main frame 10. To work.

(Step 7) After the pull-in operation of the pull-in rod 39 is completed, the nut 37e is then screwed in, and the clamp 36 is positioned and fixed in a fixed position as shown in FIG. Then, as shown in FIG. 19, the center hole jack 45 is removed. In this state, the lower end of the bundle T and the inner end of the radiation cable 11b are integrally connected by the connecting device S, but these are twisted, bent, or unbalanced due to the presence of the respective hinges and the universal joint mechanism 37. It becomes difficult to cause such problems. (Step 8) As shown in FIG. 20, the gantry 40 is disassembled, and the work of introducing tension into each cable is completed.

According to such a cable tension introducing method, the length of the radiation cable 11b is previously set to be short by adjusting the turnpuckle 35, so that the main body portion 30 of the connecting device S and the circumferential cable 11a are held. Since the clamp 36 for fixing is then separated, the tension introduction margin for introducing tension to the cable is formed by pulling the clamp 36 apart by the distance.

Then, the inner end of the radiation cable 11b and the lower end of the bundle T are connected using a connecting device S, and then the connecting device S portion and the circumferential cable 11 are connected.
A large tension is introduced to the radiation cable 11b and the circumferential cable 11a by pulling a and a by the center hole jack 45 and connecting them to each other. At this time, the lower end of the bundle T is connected to the inner end of the radiation cable 11b,
Since the upper end is connected to the main frame 10, the reinforcing frame 11
An upward axial force is generated in the bundle T in the process in which the tension is introduced into the cable constituting the above, and this axial force acts as a force for pushing the main frame 10 upward. That is, when a large tension is introduced into the cable forming the reinforcing frame 11 by the center hole jack 45, this tension acts as a reaction force that pushes up the main frame 10 via the bundle T on the contrary.

Further, since the connecting device S is provided with the universal joint mechanism 37 at the connecting portion between the circumferential cable 11a and the radiation cable 11b, the tension of the center hole jack is exerted by the action of the universal joint mechanism 37. It is possible to effectively prevent twisting or bending between the circumferential cable 11a and the radiation cable 11b, which tends to occur at the time of introduction.

That is, in the embodiment, the connecting rod 37 to which the circumferential cable 11a is attached via the clamp 36.
c is rotatable about the vertical bolt 37d with respect to the main body 30 in the lateral direction in the range of about 20 to 30 degrees to the right and left, and is also rotatable about the horizontal bolt 37b in the vertical direction. In addition, the inner end of the one radiation cable 11b is hinged to the main body 30 via a bolt so as to be rotatable in the vertical direction, and the upper end of the main cable 1b.
The lower end of the bundle T that is rotatably connected to
Since it is hingedly connected to and is rotatable, these operations do not cause twisting or bending in the connection between the cables and the bundle.

When introducing the tension to each cable, first, each radiating cable 11b and the lower end of the bundle T are connected by using the connecting device S, and in this state, the radiating cable and the circumferential cable are pulled together by the jack to connect. The number of jacks can be reduced by half compared to the method of introducing tension by attaching and pulling a jack to each radiation cable from the outer end of each radiation cable. It also becomes easier by that amount, thereby reducing the construction cost and simplifying the tension management.Furthermore, since this tension introduction work will be performed inside the roof frame, the condition of the entire roof frame will be maintained. It is easy to grasp, and therefore the tension can be introduced while grasping the installation state, so that the tension introduction work can be performed easily and reliably.

Further, in the dome type roof frame in which the tension is introduced in this way, in the main frame 10 alone, thrust is generated in the outer peripheral boundary ring 13 in the direction of arrow F1 as shown in FIG. Since the reinforcing frame 11 and the bundle T are combined together to form a roof frame, the tension T1 introduced into the radiation cables 11b as a reaction force against the thrust F1 is applied to the outer peripheral boundary ring 1.
3, the thrust F1 of the outer peripheral boundary ring 13 is reduced. Therefore, it is possible not only to construct the outer peripheral boundary ring 13 without using a large amount of steel material (tension material) having excellent tensile strength but also to use the lower structure for supporting the outer peripheral boundary ring 13. It is also possible to significantly reduce the construction cost for constructing a certain peripheral structure K or the like.

Further, a reinforcing frame 11 is constructed at a lower position of the main frame 10 which is formed by connecting a plurality of steel frame members (outer peripheral member 12, circumferential member 15, radiating member 16) to each other in a plane truss shape. , All radiating cables 11 of the reinforced frame 11
By introducing a tension T1 directed outward in the radial direction into b ..., the main frame 10 is caused by the bundle axial force of the vertically arranged bundle 11c (the force by which the bundle rises and pushes up the joint portion of the main frame). The joint B between the steel aggregates is uniformly pushed up.
As a result, the weight of the steel frame is significantly reduced compared to the multi-layer truss dome, and the structural stability against snow etc. becomes the same level as the multi-layer truss dome due to the cable reinforcement of the main frame 10 by the reinforcing frame 11. The instability of the main frame 10 adopting the single-layer truss dome structure is sufficiently avoided, and the buckling resistance of the steel aggregate is sufficiently enhanced.

Further, since the outer peripheral boundary ring 13 is supported by the outer peripheral structure K via the pin roller mechanism 20 in the form of radial free and circumferential pin support, thrust and radial directions are supported. It exerts the action of releasing seismic force, temperature stress, etc. and further reducing the load on the outer peripheral structure K.

In the above embodiments, the cable tension introducing method of the present invention using a bundle is applied to a "suspend dome" having a hybrid structure by combining a single-layer truss dome and a cable dome. I showed you
It goes without saying that the main frame structure and the reinforcing frame structure can also be applied to a known cable dome structure including cables, and further to a string beam structure.

[0045]

As described above, the cable tension introducing method for a dome type roof frame according to the present invention has the following excellent effects.

According to the first aspect of the present invention, as a method of introducing tension into the cable, attention is paid to a connecting portion where the bundle material, the circumferential cable and the radiation cable are concentrated and connected, and the length of the radiation cable is set in advance. In addition to setting it short, the inner end of this radiation cable and the lower end of the bundle are connected using a connecting device, and then the connecting device portion and the circumferential cable are pulled together by a jack and connected to each other. Since the tension is introduced into the cable by doing so, the number of jacks will be half compared to the method of introducing the tension by attaching and pulling a jack to each radiation cable from the outer end of each radiation cable. It is possible,
Therefore, the tension introduction work will be correspondingly easier, thereby reducing the construction cost and simplifying the tension management. Furthermore, since this tension introduction work will be performed inside the roof frame, the entire roof frame It is also easy to grasp the installation state of, and therefore it can be performed while grasping the installation state, so that the tension introduction work can be performed easily and reliably.

According to the second aspect of the present invention, since the connecting device is provided with a universal joint mechanism at a connecting portion between the circumferential cable and the radiation cable, the center hole jack is operated by the action of the universal joint mechanism. It is possible to effectively prevent twisting or bending between the circumferential cable and the radiation cable, which tends to occur when the tension is introduced by. In particular, when an uneven load is applied to the dome due to snowfall or the like, the load tension applied to the cable can be made uniform at all times.

[Brief description of drawings]

FIG. 1 is a plan view of a main frame showing an embodiment of the present invention.

FIG. 2 is a side view of the main frame showing an embodiment of the present invention.

FIG. 3 is a sectional view of a main frame showing an embodiment of the present invention.

FIG. 4 is a plan view of a reinforcing frame showing an embodiment of the present invention.

FIG. 5 is a perspective view of a main frame showing an embodiment of the present invention.

FIG. 6 is a perspective view of a reinforcing frame showing an embodiment of the present invention.

FIG. 7 is a sectional view of a support mechanism showing an embodiment of the present invention.

FIG. 8 is a side view of the support mechanism showing the embodiment of the present invention.

FIG. 9 is a perspective view of a connection device showing an embodiment of the present invention.

FIG. 10 is a partial cross-sectional plan view of a connection device showing an embodiment of the present invention.

FIG. 11 is a side view of the main part of the connection device showing the embodiment of the present invention.

FIG. 12 is a partial plan view of the connection device showing the embodiment of the present invention.

FIG. 13 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 14 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 15 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 16 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 17 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 18 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 19 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 20 is a schematic process diagram illustrating a tension introducing method according to an example of the present invention.

FIG. 21 is a perspective view showing a conventional example.

FIG. 22 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 10 Main Frame 11 Reinforcement Frame 11a Circular Cable 11b Radiation Cable 12 Perimeter Material 13 Perimeter Boundary Ring 15 Circumference Material 16 Radiation Material 30 Main Body 35 Turnpuckle 36 Clamp 37 Universal Joint Mechanism 37C Connecting Rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuo Tatemichi 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Satoshi Fujiwara 2--1026 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (2)

[Claims] 1. A dome-shaped main frame which is erected on an outer peripheral structure for supporting a roof, a reinforcing frame which is arranged on a lower surface side of the main frame and reinforces the main frame, and the reinforcing frame. A bundle member having a lower end connected to the main frame and an upper end connected to the main frame, and at least the reinforcing frame of the main frame and the reinforcing frame is located inside the outer boundary ring of the main frame. It is a cable tension introduction method for a dome type roof frame composed of a circumferential cable arranged in an annular shape and a plurality of radiating cables stretched between the circumferential cable and the outer boundary ring of the main frame. Then, the length of the radiation cable is set to be short in advance, and the inner end of the radiation cable and the lower end of the bundle are connected by using a connecting device, and then the connecting device portion and the circumferential cable are connected. And jack A cable tension introducing method for a dome type roof frame, wherein tension is introduced to the cables by pulling them together and connecting them to each other. 2. The cable tension introducing method for a dome type roof frame according to claim 1, wherein the connecting device is provided with a universal joint mechanism at a connecting portion between the circumferential cable and the radiation cable. A method of introducing cable tension for a characteristic dome roof frame.