JP3303153B2 - Multi-cable support beam and roof or floor support structure using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cable support beam suitably used for supporting an artificial ground or a roof formed on a track, a bus terminal, a public plaza or the like with a large span, and the like. Related to roof or floor support structures.

[0002]

2. Description of the Related Art When supporting a floor made of artificial ground on a track, a bus terminal, a public plaza, or the like, or a roof of a building requiring a large pillar-free space such as a sports facility, a hall, a logistics facility, or the like. When supporting the floor, for example, a cable support beam 100 as shown in FIG. 17 is used.

[0003] The cable supporting beam 100 is a beam main body 10.
The bundle 102 extends downward from the middle part of the bundle 1, and the lower end of the bundle 102 is supported by cables 103 stretched at both ends of the beam main body 101. In this beam main body 101, the own weight of the beam main body 101 and the load on it are
2 is supported by the tensile force generated in the cable 103 via the cable 2, and has a structurally strong strength.

The vertical component of the tensile force T of the cable 103 is changed by
5 and the horizontal component is
At 04, the compression force C of the beam main body 101 is obtained.

Since the beam main body 101 bears the compressive force C due to the reaction force acting on the cable fixing portion 104 and the bending due to the fixed and loaded loads, when the span L becomes large, the central bundle 102 of the beam main body 101 becomes large. The distance a from the attached portion to the cable fixing portions 104 at both ends is also increased, and the cross section of the beam main body 101 is also increased. In order to avoid this, conventionally, as shown in FIG.
And the distance a is kept small.

[0006]

However, FIG.
In order to support the lower end of each bundle 102 with a predetermined supporting force by the cable 103, a level difference Da, Db,... Between the lower ends of the adjacent bundles 102 is required. There is a disadvantage that the height H to which the level differences Da, Db,. Further, since there is only one cable 103 for supporting the bundle 102 and the tensile force T is fixed, the force for supporting the bundle 102 cannot be adjusted, and there is a disadvantage that the fine stress control of the beam main body 101 cannot be performed. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and does not cause a bundle or a cable extending downward from a beam main body to protrude significantly downward, and can adjust stress control generated in the beam main body. And a roof or floor supporting structure using the same.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a beam main body spanned between spans is divided into a plurality of portions along a length direction, and the divided portions are divided into a plurality of portions. From the split point, the bundles having almost the same height are extended downward, and one bundle is
Other is divided into a plurality of sets of every two, the lower end of the bundle which is divided into the plurality of sets is supported for each bundle constituting each set by a plurality of cables strung span across the front
The bundle is arranged symmetrically with the center of the span as the axis of symmetry,
Also, the multiple cables stretched at both ends of the span
It is characterized by being arranged symmetrically .

[0009]

[0010]

According to a second aspect of the present invention, each of the plurality of bundles has a built-in length adjusting mechanism.

[0012] The invention according to claim 3 is characterized in that a length adjusting mechanism is incorporated in each of the plurality of cables.

[0013] In the invention according to claim 4 , the multiple cable supporting beams are arranged so as to cross each other so that the positions of the respective bundles intersect with each other, and are arranged above the multiple cable supporting beams. It is characterized by supporting a roof or floor.

[0014]

According to the first aspect of the present invention, the bundles extending downward from the intermediate portion of the beam main body are set to have substantially the same height, so that the bundles and the cables do not protrude significantly downward, and the entire support beam does not protrude. The height is not very high. In addition,
Even if the heights of the bundles are substantially equal, the bundles are supported by a plurality of cables for each of the bundles constituting the set, so that the supporting force at the lower end of the bundle does not become insufficient. Conversely, since the supporting force at the lower end of the bundle can be adjusted individually, stress generated in the beam main body can be controlled. Also, the bundle is divided into groups of one or two.
The lack of support at the bottom of the bundle
Layers can be prevented. By the way, 3 or more bundles 1
When supporting them with cables for each pair as a pair
, The height of each bundle is almost equal, so
Avoid the lack of support of the middle bundle that forms
Absent. In addition, the bundle has the center
A plurality of cables arranged symmetrically and stretched at both ends of the span
Cables are also arranged symmetrically, so individual
Even if the tension of the cable is changed, the left and right bundles are equal
The lifting force works, and the beam body has a good left-right balance.
Can be supported.

[0015]

[0016]

According to the second aspect of the present invention, since the length adjusting mechanism is incorporated in each of the plurality of bundles, the supporting force can be adjusted for each bundle. The tension of each cable can be adjusted according to the requirements, and even after the building is completed, the purpose of the building will be changed, the load on the floor will increase, and the stress will increase even if the deflection increases. Easy to deal with.

According to the third aspect of the invention, since the plurality of cables each have a length adjusting mechanism incorporated therein, the operation is the same as that of the fourth aspect of the invention.

According to the fourth aspect of the present invention, a plurality of multi-cable supporting beams are arranged so as to intersect with each other so that the positions of the bundles intersect with each other, and the roof is arranged on the upper portion by the multi-cable supporting beams. Or, because the floor is supported, cables and bundles do not protrude significantly below the multiple cable support beam, and the space under the multiple cable support beam is made evenly high over the entire surface for effective use. Can be achieved. Also,
Since the supporting force of each bundle can be adjusted according to each loading load, fine stress control of the beam main body can be performed, and the height of the roof or floor can be minimized.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment of Multiple Cable Support Beam> FIG. 1 shows a first embodiment of a multiple cable support beam according to the present invention. As shown in this figure, a beam main body 2 made of a single material such as an H-beam is spanned between spans of a multiple cable supporting beam 1, and the beam main body 2 has a plurality of portions 2a, …
Are divided into It is desirable to divide the beam main body 2 symmetrically with the center of the span as the axis of symmetry, but this is not always necessary depending on the load conditions applied to the beam main body 2 and the like. In FIG. 1, the beam main body 2 is substantially equally divided into six pieces.

Then, bundles 3a, 3b,... Having substantially the same height extend downward from each of the divided points of the beam main body 2 so that their lower ends are substantially aligned with a horizontal plane. And the bundles 3a, 3b
are divided into a plurality of sets. In FIG. 1, only one bundle 3 is provided at the center as shown in FIG.
a, the center of the span is symmetrical, such as bundles 3b, 3b disposed on the left and right sides of the central bundle 3a as shown in FIG. 3, and bundles 3c, 3c provided on the left and right ends as shown in FIG. It is divided into three sets that are symmetrical about the axis.

Each of the bundles 3a, 3
are supported for each bundle 3a, 3b,... constituting a group by a plurality of cables 5a, 5b,.
As described above, since the bundles 3a, 3b,.
Are supported on the bundles 3a, 3b,... And are also arranged symmetrically with the center of the span as the axis of symmetry.

That is, the multiple cable support beam 1 shown in FIG. 1 is composed of a plurality of cable support beams 1a,
It can be said that 1b and 1c are overlapped and integrated.

In order to adjust the pulling force of each of the cables 5a,...
a length adjusting mechanism 6 for adjusting the length of the bundle, such as a jack, is incorporated in each of the cables b,.
A length adjusting mechanism 7 such as a turnbuckle and a jack is incorporated in each of a, 5b, and 5c.

The bundles 3a, 3b... Have their lower ends connected to the individual cables 5a, 5b as described above.
Although they are divided into a plurality of sets on the basis of the relationship supported by b and 5c, in this case, they are divided into one or two sets.
For example, when the number of the bundles 3a, 3b,... Is odd, the bundle is divided into a set of two at the center of the beam main body 2 and the other at the outside as shown in FIGS. Bundles 3a, 3
If the number of b,... is an even number, they are all divided into two sets as shown in FIG.

When a load is applied to the multiple cable supporting beam 1 having the above-described structure, first, the load is applied from the beam main body 2 to the bundle 3a,
, And a tensile force is generated in the cables 5a,. The portions of the beam main body 2 supported by the bundles 3a,... Are supported from below by the tensile force generated in the cables 5a,.

The bundles 3a,.
Are aligned substantially along the horizontal plane, so that when the multi-cable support beam 1 is viewed as a whole structure, bundles 3a,... And cables 5a,. The space below the multiple cable support beam 1 can be effectively used without protruding greatly downward.

Here, in the case where the beam main body 2 has a single continuous structure, the bending stress of the beam main body 2 is greatly changed depending on how the divided individual portions 2a are supported by the bundles 3a,. Come. It is more economical to make the bending stress of the beam main body 2 as uniform as possible in each of the divided portions 2a,. As a means for that, there is a method in which the beam main body 2 is pin-joined at the dividing point and is not a continuous beam. However, the beam main body 2 is preferably a continuous beam in all respects of bending stress, axial force, vibration, and deflection. It is more preferable to use a continuous beam because it is advantageous.

When the beam body 2 is a continuous beam, the stress and deformation of the beam body 2 can be controlled by changing the push-up force and the amount of vertical movement of the bundles 3a,. Thus, an economical structure is possible. The lifting force of the bundles 3a,... And the amount of vertical movement are determined by the bundles 3a,.
The tension of the cables 5a,... Can be changed by changing the length adjusting mechanisms 6, 7 pre-installed in the.

The bundles 3a,.
are supported by a,..., so that if the tension of the cables 5a,... is changed, only the bundles 3a,.

Furthermore, the bundles 3a,... Are arranged symmetrically and the cables 5a,... Are also arranged symmetrically, so that even if the tension of each cable 5a,. The push-up force acts and the balance between the left and right stresses is not broken, and the stress can be easily adjusted.

<Modified Example of Multiple Cable Support Beam> In the above embodiment, the beam main body 2 is made of a single material such as H-beam,
Are extended downward from each of the dividing points, and the cables 5a,... Are hung on the lower ends of the bundles 3 and supported. However, the structure of the beam main body 2 is limited to that described above. Instead, the following can also be used.

FIG. 6 shows an example in which a beam body 2 having a truss structure is used, and FIG. 7 shows an example in which a beam body 2 of Fireendale is used. FIG. 8 shows an example in which the beam main body 2 having a truss structure is used, and the lower end of the beam main body 2 is located at substantially the same position as the lower end of the cable 5. FIG. 9 shows the beam main body 2 of Fireendale. This is an example in which the lower end of the beam main body 2 is used at the same position as the lower end of the cable 5.
10 and 11 show an example in which the beam main body 2 of the truss structure or the Firendale is used, and the lower end of the beam main body 2 is lower than the lower end of the cable 5. In FIGS. 10 and 11, the internal space of the beam main body 2 can be used as a room.

<Embodiment of Roof or Floor Supporting Structure Using Multiple Cable Supporting Beams> The one shown in FIG. 12 uses a plurality of the above-described multiple cable supporting beams, and the positions of each bundle become intersections. Is an example of a support structure that is arranged to intersect and support the roof or floor above it by the multiple cable support beams.

That is, what is shown in these figures is a multi-cable supporting beam 2 having a beam main body 21 having a four-part structure.
In this example, the multiple cable support beams 20 are assembled in a lattice shape such that the positions of the bundles 22 are located at intersections in a plan view.

A bundle 2 per one multi-cable support beam 20
Since the number of 2 is three, each of the three beam main bodies 21 is assembled in a lattice shape in the X and Y directions as shown in FIG. The bundle of intersections 22 is shared by the multiple cable support beams 20 in both the X and Y directions. The lengths of the bundles 22 are aligned so that the lower ends of the bundles 22 are substantially aligned with the horizontal plane. A cable 25 is bridged between the lower end of the bundle 22 and the cable fixing portions 24 at both ends of the beam main body 21, and a tensile force is introduced to the cable 25. Structures such as floors and roofs are formed above the multiple cable support beams 20,.

Here, when a load is applied to the structure such as the floor or the roof, the load is transmitted to the bundle 22 via the beam main body 21, and a tensile force is generated in the cable 25. With this tensile force, each division point of the beam main body 21 is supported via the bundle 22. And when the cable 25 is prestressed,
The lifting force of the beam main body 21 by the bundle 22 is changed, so that the stress and deflection of the beam main body 21 can be arbitrarily changed.

Since the bundle 22 is supported by separate cables 25, the tension and the tension of each cable 25 are adjusted to freely control the stress and deformation of each beam body 21 on the upper side of the bundle 22. be able to. Therefore, even when a localized concentrated load is applied to a limited number of the multiple cable support beams 20, it is possible to easily cope with the case.

Specifically, the tension of the cable 25 related to the multiple cable support beam 20 to which a concentrated load is applied is increased. Since the cable 25 is directed in both the X and Y directions, if one of the cables 25 in the X and Y directions is strongly pulled and the other is weakly pulled, a load can be caused to flow toward the strongly pulled one. Therefore, the magnitude of the axial force of the surrounding pillars that support these beam bodies 21 can be controlled, and the degree of freedom in designing the pillars, foundations, and the like also increases.

<Modification of Roof or Floor Support Structure Using Multiple Cable Support Beams> The above support structure mechanically secures left-right symmetry so that the left and right stress balances of individual multiple cable support beams are not lost. Within the range, various modifications are possible as described below.

In the above embodiment, the multiple cable support beams 20
The beam main body 21 used for the above had a four-part structure,
The beam body is not necessarily limited to the four-segment structure, and may be a six-segment structure or a five-segment structure as shown in FIG. 1 or FIG. As shown in FIGS. 14 and 15, the span and the number of divisions in the X and Y directions may be arbitrarily changed.
Is not necessarily 90 degrees, and FIG.
As shown in FIG. The bundle 22 is supported by cables 25 in both X and Y directions, but as shown in FIG.
The other side may be omitted while leaving one of the directions.

When a large span roof is supported by such a structure, for example, the lower ends of the bundle 22 and the cable 25 can be aligned. Stage equipment such as grape shelves can be placed under the slab, and installation work such as catwalk is also simplified. Further, when the ceiling is extended, the ceiling surface can be made horizontal, so that there is an advantage that no useless space is generated in the room.

In the case of supporting the artificial ground , not only the cable pulling force can be adjusted according to the load acting on the multiple cable supporting beam during construction, but also,
Even if the use of the building is changed after the completion of the building, and the load placed on the floor or the like increases and the stress increases in bending, the advantage that it can be easily dealt with by changing the cable tension is obtained.

[0044]

According to the first aspect of the present invention, the bundles extending downward from the intermediate portion of the beam main body are set to have substantially the same height, so that the bundles and cables do not protrude significantly downward. Since the height of the whole supporting beam is not so high and the supporting force at the lower end of the bundle can be adjusted individually, the stress generated in the beam main body can be controlled. One or two bundles
Since the book is divided into pairs, the supporting force at the lower end of the bundle is not
The addition can be further prevented. Also before
The bundle is arranged symmetrically with the center of the span as the axis of symmetry.
Also, multiple cables stretched at both ends of the span
Since the cables are symmetrically arranged, the tension of each cable can be reduced.
Even if changed, equal push-up force works on the left and right bundles respectively
Therefore, it is possible to support the beam body with good left-right balance.

[0045]

[0046]

According to the second aspect of the present invention, since the length adjusting mechanism is incorporated in each of the plurality of bundles, the supporting force can be adjusted for each bundle. The tension of each cable can be adjusted according to the working load.In addition, after the building is completed, the purpose of the building is changed, the load on the floor etc. increases, and the stress changes the cable tension even when the deflection increases. Can be easily dealt with.

According to the third aspect of the present invention, since the plurality of cables each have a length adjusting mechanism incorporated therein, the same effect as that of the fourth aspect of the invention can be obtained.

According to the fourth aspect of the present invention, a plurality of multiple cable support beams are arranged so as to intersect with each other so that the positions of the bundles are at intersections.
Since the roof or floor placed on top of the cable is supported, cables and bundles do not protrude significantly below the multiplex cable support beam, and the space under the multiplex cable support beam is completely uniform. Height can be used effectively. In addition, since the supporting force of each bundle can be adjusted in accordance with each loading load, fine stress control of the beam main body can be performed, and the height of the roof or floor can be kept to a minimum.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of a multiple cable support beam according to the present invention.

FIG. 2 is an exploded side view showing the structure of the multiple cable support beam.

FIG. 3 is an exploded side view showing the structure of the multiple cable support beam.

FIG. 4 is an exploded side view showing the structure of the multiple cable support beam.

FIG. 5 is a schematic side view showing another embodiment of the multi-cable support beam according to the present invention.

FIG. 6 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 7 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 8 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 9 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 10 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 11 is a schematic side view showing a modified example of the multiple cable support beam according to the present invention.

FIG. 12 is a plan view and a side view showing an embodiment of a roof or floor support structure using multiple cable support beams according to the present invention.

FIG. 13 is a schematic perspective view showing an embodiment in which one of the cables in the X and Y directions is omitted.

FIG. 14 is a plan view showing a modification of the roof or floor support structure using the multiple cable support beams according to the present invention.

FIG. 15 is a plan view showing a modification of the roof or floor support structure using the multiple cable support beams according to the present invention.

FIG. 16 is a plan view showing a modification of the roof or floor support structure using the multiple cable support beams according to the present invention.

FIG. 17 is a side view illustrating a conventional cable support beam.

FIG. 18 is a side view illustrating a conventional cable support beam.

[Explanation of symbols]

 1, 20 Multiple cable support beams 2, 21 Beam main body 3a, 3b, 3c, 22 bundle 4, 24 Cable fixing unit 5a, 5b, 5c, 25 Cable 6 Bundle length adjustment mechanism 7 Cable length adjustment mechanism

Claims (4)

(57) [Claims] 1. A beam main body spanned between spans is divided into a plurality of portions along a length direction, and bundles having substantially the same height are respectively extended downward from the divided points. At the same time, the bundles are divided into a plurality of sets of one or two, and the lower ends of the divided bundles are respectively constituted by a plurality of cables stretched at both ends of the span. Each bundle is supported , and the bundles are arranged symmetrically with the center of the span as the axis of symmetry.
And a plurality of cables stretched at both ends of the span.
A multi-cable support beam, which is symmetrically arranged . 2. The multiple cable support beam according to claim 1 , wherein a length adjustment mechanism is incorporated in each of the plurality of bundles. 3. The multi-cable support beam according to claim 1 , wherein a length adjustment mechanism is incorporated in each of the plurality of cables. 4. A multiple cable supporting beam according to claim 1 or 2 , wherein a plurality of the multiple cable supporting beams are arranged so as to intersect with each other so that the positions of the respective bundles intersect with each other. A roof or floor support structure using a multi-cable support beam, characterized by supporting a roof or floor disposed on a floor.