JPS63147032A - Construction having tensile string beam floor structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure comprising a novel floor structure.

(Prior art and its problems) Conventional floor structures generally consist of a floor, small beams, large beams, and columns, and the small beams and large beams handle floor loads (fixed loads, precise loads, This was to transmit snow load) to the pillars.

Therefore, increasing the column spacing has been difficult due to functional, economical, and material constraints.

On the other hand, the strung beam structure that has been used for conventional roof structures,
The main feature is that the stress and deformation of the beam material are controlled by introducing prestress using tensile materials such as cables.

That is, as shown in the example shown in FIG. 12, the stringed beam structure has a beam 2 between a pair of columns 1.1 that are opposed to each other with a predetermined interval.
At the same time, a cable 3 is stretched between the columns 1 and 1 at a position below the beam 2, and the beam 2 and the cable 3 are connected approximately at the center by an auxiliary member 4. , a beam 2 and a cable 3, and a pair of columns 1. For example, one side of the joint with L is a pin fulcrum 5 and the other side is a roller fulcrum 6.

Therefore, the tension generated in the cable 3 due to the weight of the beam 2 can be borne by the beam 2 itself as an axial force, and since it is a so-called zero anchor type, no anchor is required, and furthermore, a predetermined prestress can be introduced to the cable 3. Accordingly, beam 2
This has the advantage that it is possible to obtain an optimal stress distribution for.

Therefore, the present invention focuses on the fact that the above-mentioned effect increases as the fixed load is larger than the added load or as the span becomes larger. This was proposed for the purpose of further application as a floor structure suitable for the like.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, in the direction between the beams between the columns facing each other at a predetermined interval, the floor structure surface of a certain layer has a 1 tensile material, and horizontal members are placed on the floor structure surface of one layer above it, respectively, between each of the above-mentioned columns or between each of the girders placed between the columns in the girder direction. ,
Each of the horizontal members of the upper layer and each of the corresponding first tensile members of the layer immediately below are connected by a bundle member, and the first tensile member at or near the lower end of the bundle member and the first tensile member of the horizontal member of the layer directly below are connected by a bundle member. By connecting both ends with a second tension member, the horizontal member and
The present invention is characterized by a structure having a strung beam floor structure in which a strung beam is constituted by a first tensile member, a second tensile member, and a bundle material.

(Example) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention, and are an example in which the floor structure according to the embodiment is applied to a multi-story parking lot.

The parking lot IO according to this embodiment is a three-layer structure, conceptually consisting of columns 11, girders 12, horizontal members 13,
Tensile material 14. Second tensile material 15, bundle material 16. and floor body 17
It consists of

Therefore, in terms of structure, a stringed beam floor structure T as a vertical load resistance system is arranged in the direction between the beams, and a lattice beam structure as a horizontal load resistance system is arranged in the direction of the first row, and auxiliary horizontal It is made up of a load-resisting structure.

As shown in FIGS. 1 to 3, in the direction between the beams, the first tensile material 14 is applied to the floor surface of the second layer as an even layer, and the floor structure of the third layer as an odd layer is applied. Six horizontal members 13 are arranged on each side of the structure.

In this embodiment, the first tensile member 14 and the horizontal member 15 are both made of H-beam steel, and the horizontal member 14 is made of a member with a larger cross section.

Both ends of the first tensile member 14 and the horizontal member 15 are as follows.

At the outer circumferential position δ of the parking lot 10, as shown in FIG. 2, the pillars 11 and 11 are placed between each other, while at the inside position of the building, as shown in FIG. .11
It is mounted between each girder l2.12 mounted between.

Thus, each of the horizontal members 13 of the third layer and each of the first tensile members 14 of the second layer, which is the layer immediately below it, are connected by a pair of bundle members 16 each disposed at an intermediate position in the direction between the beams. connected, and
a first tensile member 14 at or near the lower end of the bundle member 16;
Both ends 13a, 13a of the horizontal member 13 are connected by second tension members 15 and 15, respectively.

As a result, the stretched beam T is constituted by the horizontal member 13, the first tensile member 14, the second tensile member 15, and one bundle member 16.

In addition, in FIG. 3, 1B is a stud placed between the upper and lower girders 12 and 12.

In addition, as shown in Figures 1 and 4, the stringed beam T on the outer periphery is
The horizontal load resisting structures 19, 19 are each projected from the horizontal load resisting structures 19,19.

The structure 19 connects two wooden columns 11.11 to each other at the floor structure positions of the second and third layers with a girder 20, and also connects the two wooden columns 11. The first tensile member 14 and the horizontal member 13 and the column bodies 11 and 11, which face each other in position, are
A lattice beam is formed by connecting the two girders 20, 20, the girder 20 of the second layer, and the lower end of the column with diagonal members 22, and the seismic force applied in the direction between the beams is , and is configured to bear horizontal forces such as wind pressure.

On the other hand, in the girder direction, as shown in FIG. 5, the girders 12.12 are arranged at the floor structure positions of the second and third layers, and the diagonal beams 22.12 are arranged between the two girders. A lattice beam is formed with 22, and is designed to resist horizontal force loads in the column direction.

Next, FIG. 6 is an explanatory diagram showing the planar configuration of the first layer portion, and FIG. 7 is an explanatory diagram showing the planar configuration of the second layer portion and the third layer portion. All three levels are configured so that they can be used as parking spaces.

That is, the ground surface of the first layer portion is the vehicle elevation M shown in FIG.
23 and the area other than vehicle traffic space 24 is parking space 25, and #! 2nd and 3rd layer from top
When moving a vehicle to the parking space 25 in the layered portion, the vehicle is moved onto the lifting device 23 from the lower center position in FIG. is raised to set the vehicle to a level that matches the end δ of the second or third layer.

Next, the vehicle is moved forward from the elevator M23 in FIG.
Set above.

Thereafter, the carrier 26 is operated to horizontally move left and right to a vacant predetermined parking space 25, and from that position the vehicle itself is operated to move to each parking space 25.
The vehicle is moved and parked inside the vehicle.

Furthermore, when returning the vehicle from the parking position to the ground, the vehicles parked on the second and third tiers may be moved to the ground in the reverse procedure as described above.

In addition, in Fig. 1, the reference numeral 30 is a connecting member that interconnects the stringed beams arranged in the direction between the beams, and in Figs. 1 and 7, the reference numeral 31 is a place for improving the horizontal rigidity of the floor structure. 32 in FIG. 1 indicates a pantograph mechanism as an example of a mechanism for raising and lowering the elevating device.

In this embodiment, prestress is introduced into the first tensile member 14 and the second tensile member 15 in order to realize the features of the tensioned beam floor structure T.
In addition to the method of directly introducing tension into the bundle material 16, there is a method of introducing compressive force into the bundle material 16.

FIG. 8 shows an example of a tension introducing device 27 using the latter method, in which a cylindrical portion 27a of a predetermined length is fixed to the lower end of the bundle main body 16, and the inner peripheral surface thereof is coated with acid. Screws are engraved.

The upper part of a bolt 27b having a predetermined length is screwed into the cylindrical part 27a, and the lower end of the bolt 27b is a bottomed part formed integrally with the first tensile member 14 and the second tensile member 15. It is fitted into the cylindrical pressure receiving part 27c.

Therefore, the bolt 27b has a pair of nuts 28a, 28.
b are screwed together in advance, and when the upper nut 28a is rotated to move the bolt 27b downward in the figure, the lower end of the bolt 27b presses the pressure receiving part 27c with a predetermined strength, and the bolt The pressing force applied to the tension members 14 and 15 can be adjusted according to the amount of descent of the tension member 27b.

Note that since the nut 28b does not move from its original position, it is possible to know the amount of movement of the nut 28a and check the strength of the applied compressive force.

Therefore, the bolt 27b receives pressure fi! By pressing the tension members 14 and 15 integrated with 127c, a predetermined tension is generated in the tension members 14 and 15.

Note that the tension introducing device 27 is not limited to the above example, but may be configured as shown in FIG. 9, for example.

That is, the first bolt 27d is screwed into the main body 16 of one bundle so that it can move up and down, and the i2
While the lower end of the bolt 27e is fixed, the lower part of the first bolt 27d and the upper part of the second bolt 27e are screwed into the common rotating member 27f from above and below, respectively, and the threading direction of both bolts is reversed. If set, one rotation member 27f
By rotating the bolts in a predetermined direction, both bolts move in the direction of separation, and a predetermined tension can be generated in the tension members 14 and 15 in the same manner as in the above example.

After the above-mentioned frame is formed, the floor body 17 is shaped by, for example, pouring concrete as a floor material on the floor structure surfaces of the second and third layers, and the multi-level parking according to this embodiment is formed. Construction of the main structure of the parking lot 10 is completed.

In addition, as shown in FIG. 1θ, the horizontal member 13 in this embodiment is mounted so that the end portion 13a of the horizontal member is supported by a roller on the support portion 29 provided on the column 11 (or the girder 12). A is placed in close proximity.

Here, one of the features of this embodiment, which is a change in the support state of the strung beam floor end due to concrete pouring, will be explained.

As described above, the horizontal member 13 is placed and joined to the support portion 29 provided on the column 11 so that the end portion 13a of the horizontal member is supported by rollers. When cast-in-place concrete is poured as shown in FIG. 10, the horizontal members 13 are deflected by a predetermined amount due to the concrete's own weight, and the ends 13a of the horizontal members slide by a predetermined distance to the left in FIG. .

In this state, the concrete hardens and the floor body 17, the horizontal members 13, and the girders 12 are integrated, so the horizontal members 13 are attached to the supporting parts 29, which are already integrated with the girders 12 and the columns 11. On the other hand, it becomes unable to slide, and changes to a pin-supported state after hardening.

Figure 11 is a conceptual diagram of the above changes, and before concrete pouring, the horizontal members 13
Both ends 13a are supported by rollers, but when concrete is poured, a uniformly distributed load acts on the horizontal members 13, and as shown in FIG. 11(b), a deflection δ occurs, and both ends 13a are each moved slightly inward relative to the support portion 29.

Next, when the concrete hardens, the horizontal member end portion 13a becomes pin-supported with respect to the support portion 29, as described above.
This is shown in FIG. 11(c).

However, in the large span structure targeted by the stringed beam floor structure according to the present embodiment, the vertical load due to the parting concrete floor body 17 and other loaded objects will be extremely large due to the large span. If the end portion 13a of the horizontal member is supported by pins on the support portion 29 from the beginning, a large bending moment will be generated in the support portion 29 when the vertical load is applied. The pillars, etc. had an unnecessarily large cross section, which was a problem in conventional structural design.

However, if the configuration of this embodiment is adopted, the end portion 13a of the horizontal member is initially supported by the support member 29 by rollers, so that the bending stress due to the floor load is not generated in the support member 29. Since only a vertical force acts, the supporting member 29 can be a member with a much more economical cross-sectional performance than the conventional example.

However, after the concrete has been placed and hardened, the horizontal members 13 are fixed in a predetermined deformed state under the load of the concrete, so even if both ends 13a are supported by pins, the concrete No bending force is applied to the support member 29 due to the initial load such as
Assuming only the bending force due to short-term loads such as snow loads, it is sufficient to create a structure that can withstand this.

Therefore, compared to the conventional example, a very rational structural design is possible.

In addition, if the above-mentioned deflection amount δ of the horizontal member 13 is assumed in advance in the state shown in FIG. After the concrete has hardened, the horizontal members 13 and the floor body 17 can be formed on exactly horizontal surfaces, and in this case, the same effects as described above can be achieved.

In addition, the entire floor body 17 can be made of cast-in-place concrete, or only the joints between the horizontal members 13 and the columns 11 and girders 12 can be cast-in-place, and the other parts can be made of precast concrete plates. Depending on the design conditions, a suitable flooring material such as expanded metal may be used instead of concrete casting.

Further, although the first tensile member 14 and the second tensile member 15 are made of shaped steel in this embodiment, steel rods, cables, etc. may also be used depending on the design conditions. It is possible, and other members such as the pillars 11, the girders 12, the horizontal members 13, and the bundle members 16 can also be selected and used as appropriate depending on the conditions.

The multi-story parking lot IO according to this embodiment is configured as described above, and jI! Compared to conventional parking lots that use only the upper part, it is possible to secure approximately three times as much parking space.

Furthermore, by adjusting the magnitude of the tension introduced into the first tensile material 14 and the second tensile material 15, it is possible to control the stress distribution and amount of deformation on the floor surface, which is not possible with conventional floor structures. Large span structures, which were previously difficult to achieve, can be formed economically.

Next, in terms of construction, conventional floor structures require temporary materials such as shoring when concrete is poured, and when this temporary material is removed, there are problems such as stress and deformation due to the weight of the floor slab.

However, if the floor structure according to the present invention is adopted, there is no need for temporary materials, and as mentioned above, since deformation corresponding to the concrete's own weight occurs during concrete pouring, only the stress after the concrete hardens is transferred to the horizontal bridge. There is also an advantage that the material 13, the column 11, etc. can be designed.

Furthermore, another feature is that if the horizontal load resisting structure 19 is constructed in advance as a self-supporting structure during construction, the structure 19 can also be used as a guide for erecting other structures. There are advantages.

That is, the above embodiment shows an example of a three-layer structure, and the present invention is based on the above-mentioned strung beam structure T consisting of the second layer M and the third layer. It is possible to form a structure with an arbitrary number of layers by building a plurality of unit structures on the ground in advance and sequentially layering and connecting them.
The horizontal load resisting structure 19 described above is formed in advance to a height corresponding to a predetermined layer to be constructed, and the structure 19 is
It is sufficient to lift up each unit structure upward one by one using the construction guide as a construction guide, thereby increasing the efficiency of the construction work.

Furthermore, since the strung beam structure is an effective bridge against fixed loads, by arranging resistance elements against horizontal forces such as seismic forces and wind loads on the outer periphery of the building as in the above example, the three-dimensional structure according to the above example can be In addition to parking lots, the present invention can be applied to any structure having a large-span floor structure, such as pilotis, sports spaces, and factories.

Further, as described above, the structure according to the present invention has a tensioned beam floor 41i.
A building can have any number of layers, with two layers constituting the structure as one unit, and the two-story unit structures may be formed continuously in the height direction, or they may be formed intermittently. It goes without saying that various modifications are possible without departing from the gist of the present invention, such as arranging them in different directions.

(Effects of the Invention) As described in detail above, in the present invention, the first tensile material is applied to the floor structure surface of a certain layer in the direction between the beams between the column bodies facing each other at a predetermined interval. In addition, on the floor structure surface of the upper layer, horizontal members are placed between each of the columns or between each of the girders placed between the columns in the direction of one row, and each of the columns on the upper layer is A horizontal member and each of the corresponding first tensile members in the layer immediately below the member are connected by a bundle member, and the first tensile member at or near the lower end of the bundle member and both ends of the horizontal member are respectively connected. The present invention is characterized in that the horizontal member, the first tension member, the second tension member, and one bundle member constitute a stringed beam by connecting them with a second tension member.

Therefore, we aimed to reduce the load burden on the girder as the main structure,
It is now possible to arbitrarily control the stress distribution and amount of deformation on the floor according to the design conditions, making it possible to construct large-span floor structures at low cost without the need for complex and large-scale equipment and work as in the past. It can produce various useful effects, such as the ability to achieve

[Brief explanation of the drawing]

Figures 1 to 8 show a structure having a strung beam floor structure as an embodiment of the present invention. Figure 1 is a conceptual perspective view showing the main structure of the structure, and Figures 2 to 5 are 6 and 7 are conceptual diagrams showing the planar configuration of the structure, respectively.
The figure is a conceptual diagram of the main parts showing the configuration of the bundle material and tensile material and an example of the tension introduction device. Figure 9 is a conceptual diagram of the main parts showing another example of the tension introduction device. FIG. 11(a) and FIG. 11(b) are conceptual diagrams of main parts showing an example of a joining method. FIG. 11(c) is a conceptual diagram showing changes in the support state of the horizontal members according to the present embodiment, and FIG. 12 is a conceptual diagram showing an example of a conventional strung beam floor structure. 10--Structure (multi-story parking lot), 11--Column, 12--Girder, 13--
・Horizontal member, -14--First tension member, 15--Second tension member, 16--Bundle material, 17--Floor body,
1B--Stud. 19--Structure building for horizontal load resistance. 20.21... Girder, 22-- Diagonal material, 23-... Lifting device. 24--Vehicle passing space, 25--Parking space, 26--Carrier, 27
...Tension introducing device, 29... Support member, 30-...
Tie material, 31---place material. Patent applicant Norihide Imagawa (2 others)

Claims (6)

[Claims] (1) In the beam-to-beam direction between the columns facing each other at a predetermined interval, a first tensile material is applied to the floor structure of a certain layer,
Further, on the floor structure surface of one layer above the specific layer, horizontal members are placed between each of the columns or between each of the girders placed between the columns in the row direction, and Each of the horizontal members in the upper layer and the corresponding first tensile members in the layer directly below are connected by a bundle member, and the first tensile member at or near the lower end of the bundle member and both ends of the horizontal member The horizontal member, the first tensile member, and the second tensile member are connected by a second tensile member, respectively.
1. A structure having a strung beam floor structure, characterized in that the strung beam is constructed with bundled materials. (2) A structure having a tensioned beam floor structure according to claim 1, wherein the first tensile member is formed of a section steel. (3) A structure having a strung beam floor structure according to claim 1 or 2, wherein the structure is a multi-story parking lot. (4) The horizontal members are supported by rollers on the columns or girders, and by pouring floor concrete on top, the concrete is deformed by its own weight. 4. A structure having a strung beam floor structure according to any one of claims 1 to 3, which is in a pin-supported state after hardening. (5) The structure has the strung beam structure as a vertical load resistance system, in which the girder of the specific layer and each girder of the upper layer are connected with diagonal members to form a truss beam in the girder direction; A structure having a tensioned beam floor structure according to any one of claims 1 to 4, which is formed by separating a peripheral support structure as a horizontal load resistance system. (6) The structure has a stretched beam floor structure according to any one of claims 1 to 5, in which an auxiliary horizontal load resistance structure is attached to the outer periphery in the inter-beam direction. construct.