JP3328213B2 - Hollow slab structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hollow slab structure constituting a floor slab of a building structure.

[0002]

2. Description of the Related Art A hollow slab structure is used as one of floor slab (plate) structures of reinforced concrete and steel reinforced concrete building structures. This is formed as a floor slab having a hollow portion by embedding a hollow pipe such as a spiral steel pipe in a reinforced concrete slab, and its production is performed by casting in place. This hollow slab can be lightened without reducing the bending stiffness of the slab, and can be installed over a long span without providing small beams or large beams if the appropriate thickness is selected. ing.

When the hollow slab is virtually cut at the center of the hole along the direction of the hole, its cross-sectional shape becomes an I-shaped beam, and it is considered that these I-shaped beams are continuously gathered. When forming the actual hollow slab structure, the main reinforcement is inserted above and below the direction of the hole, shear reinforcement is arranged between the upper and lower reinforcements to act as beams, and the secondary reinforcement is set in a direction perpendicular to the main reinforcement. Various measures are taken, such as arranging reinforcing bars and integrating them with the slab.

[0004] In the construction of the hollow slab, first, a formwork is erected, a pipe position is allocated to a predetermined position of the formwork, and a bottom end bar (main reinforcing bar and sub-reinforcing bar) is arranged thereon.
At this time, a plurality of pipe pedestals are fixed at predetermined intervals, and a pipe is set thereon and fixed. Next, it is a general process to arrange the upper reinforcing bar (main reinforcing bar and secondary reinforcing bar) on top of it, attach the shear reinforcing bar across the lower reinforcing bar and the upper reinforcing bar, and finally cast concrete. It is a target.

[0005]

However, the hollow slab method has many problems as described above, and has a problem that it takes a long work period due to a large work load at a construction site. Therefore, rationalization is desired. Also, a large number of panels (panels) to be used as the formwork are required, but these are removed after construction and most of them are disposed of as waste material. It is desired from the viewpoint of reduction.

The present invention provides a hollow slab structure that can streamline the process of forming a hollow slab structure and omit the use of a mold frame, while keeping in mind the various problems of the conventional hollow slab structure. The task is to

[0007]

According to the present invention, as a means for solving the above-mentioned problems, one side of a long member having an L-shaped cross section is used as a base and the other vertical side is used as a hollow body support. A hollow slab forming member formed by integrally forming a half member having a cross section obtained by integrally dividing a hollow body near a tip of a surface on a base side of a support portion, the hollow body support portions are adjacent to each other back to back, and the base is horizontal , There is a partition where the cross section of the hollow body is longitudinally cut in the center
The hollow slab structure was formed by arranging a plurality of sets so as to have a hollow cross section and casting concrete thereon.

As another solution, one side of a long member formed in an L-shaped cross section is used as a base, and the other vertical side is used as a hollow member support portion, and a pair of long member hollow member supports are made to adjoin back to back. base is joined to a pair of long material to be horizontal, the assembly section of a portion of the periphery from the upper end of the hollow body supporting portion in the longitudinal direction thereof is inserted a hollow body which is cut in a slit-shaped hollow body is a central
A plurality of hollow slab forming members integrally formed with a hollow cross section having a partition to be longitudinally formed may be provided side by side, and a hollow slab structure may be formed by casting concrete thereon.

In any of the above inventions having such a configuration, a hollow slab structure obtained by arranging a plurality of sets of hollow slab forming members and casting concrete thereon has substantially the same configuration. Therefore, in any of the hollow slab structures of the present invention, since the hollow body supporting portion forms a rib that passes through the center of the cross section of the hollow body, the load applied to the hollow body at the time of placing concrete (self-weight + driving load)
Effectively acts on and is not easily deformed. Further, since the hollow body support portion forms a vertical rib in the longitudinal direction of the base portion, it exhibits rigidity against a load applied to the base portion, and the number of supports (supports) for supporting the slab can be reduced.

[0010] In the hollow slab structure, the pitch of the hollow body is determined by the width of the base and the height of the hollow body of the support portion is automatically determined. Therefore, the work on site is unnecessary, and the hollow body pitch and the like can be accurately matched with the dimensions predetermined in design. Since the base plays the role of the formwork, the formwork material is not required and the work of assembling and dismantling the formwork is also eliminated.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view including a cross section of a main part of a hollow slab forming member used for forming a hollow slab structure of an embodiment. As shown in the figure, the hollow slab forming member 1 is made of a long material having an L-shaped cross section.
One horizontal side is the base 2, and the other vertical side is the pipe (hollow body) support 3. A pipe half member 4 having a semicircular cross section is integrally formed near the tip of the base-side surface of the pipe support portion 3. A reinforcement rib 5 having a trapezoidal cross section is formed integrally with the base at an end edge of the base 2 opposite to the pipe support 3,
Reinforces the longitudinal rigidity of long materials.

The pipe half member 4 is not limited to a perfect semicircle, but may be a half-split member having various hollow body sections such as an ellipse, an oval, and a square. Near the lower end of the pipe support portion 3, a power distribution muscle insertion hole 6 is provided in accordance with the pitch of the lower horizontal muscle (power distribution muscle). The distribution bars are provided in a direction perpendicular to the longitudinal direction of the long material, thereby tightly fastening the hollow slab forming members 1 to each other to impart strength. In the case where the floor slab is long, the length of the long material may be formed by appropriately combining a long material having a fixed length or a fixed length.

As shown in FIG. 2, a plurality of hollow slab forming members 1 formed as described above are arranged so that the respective pipe supporting portions 3 are back-to-back and adjacent to each other so that the base 2 is at the lower bottom. When the ribs 5 are overlapped and assembled, a slab skeleton is formed. When the bases 2 are combined to be horizontally continuous, the horizontal bases form the slab formwork. Further, since the pipe half members 4 having a semicircular cross section are joined to each other by the pipe support portion 3, the assembly cross section is formed as a hollow section 9 having a circular cross section with a partition at the center.

Thus, a plurality of hollow slab forming members 1
When the concrete 7 is cast to a predetermined thickness on a side-by-side assembled structure, a hollow slab structure A shown in FIG. 3 is formed. 8 is an upper end surface of the slab. In the hollow slab structure formed as described above, the width of the base 2 is
Is determined by the pitch. Since the width of the base 2 is set to の of the pitch of the hollow portion 9 and the reinforcing ribs 5 are continuously formed in a bulging shape on the end edge opposite to the pipe support portion 3, adjacent ribs are laid at the time of laying. If they are overlapped, they can be laid without gaps, and they are also effective for reinforcing the rigidity of the base. The height dimension of the pipe support 3 erected vertically at both ends of the base 2 is determined by the thickness of the slab. The base 2, the pipe support 3, and the pipe half 4 are integrally formed by bending a single galvanized steel sheet having a thickness of, for example, 0.6 mm.

FIG. 4 is a perspective view including a cross section of a main part of a hollow slab forming member 1 'according to a second embodiment. In this example, the hollow slab forming member 1 'is a long material having a U-shaped cross section. A horizontal portion having a U-shaped cross section is used as a base 2, and two vertical portions are used as a pipe support portion 3, and a pipe half member 4 is integrally formed on a side of each pipe support portion 3 facing the base 2.
The width of the base 2 is the pitch of the hollow slab 9, and a reinforcing rib 5 is provided at an intermediate position of the base 2.

When the hollow slab forming member 1 'having the above-mentioned shape is assembled into one unit, and a plurality of the hollow slab forming members 1' are assembled with the pipe supporting portions 3 back to back as in the case of FIG. 1, a cross section shown in FIG. A substantially similar slab frame is formed. However, since the reinforcing ribs 5 are formed integrally, there is no need to overlap them. When concrete 7 is cast on the slab frame, a hollow slab structure exactly the same as in the first example is obtained.

FIG. 5 is a perspective view of a hollow slab forming member 1 "of the third embodiment including a cross section of a main part. In this example, the hollow slab forming member 1" has an L-shape as in the example of FIG. A long material having a cross section is used. It is the same as FIG. 1 that one side of the long member having the L-shaped cross section is the base 2 and the other side is the pipe support 3. The pipe support portion 3 is provided with a slit 6 'for a muscle in the vertical direction in accordance with the pitch of the muscle.

However, the pipe member 4 'of this example does not have a semicircular cross section as in the first embodiment, but has a slit 10 provided at one location around the pipe along the length direction of the pipe as shown in the figure. Is used. Similarly to the first embodiment, two L-shaped pipe support members 3 having a long section are joined back to back, and the pipe member 4 ′ is inserted through the slit 10 from above the pipe support units 3. Consists of a fixed cover.

However, in this example, the pipe supporting portions 3, 3 are arranged side by side, the power distribution muscles are inserted through the slits 6 'for the power distribution muscles, and the reinforcements are arranged. To cover the pipe member 4 '. Also in this example, the swelling reinforcing ribs 5 are provided at one end edge of the base 2 as in the first embodiment. Furthermore, the hollow slab forming member 1 ″ may be formed using a long member having a U-shaped cross section similar to that of the second embodiment in FIG.

It is to be noted that the hollow slab forming members 1, 1 ', 1 "of each of the above embodiments are laid and arranged according to a desired area and fixed by a fixing means such as welding or band fastening as necessary. In this case, the reinforcing bars may be arranged according to the conventional design standard.

The advantages of the hollow slab structure of each embodiment configured as described above are specifically described as follows. 1. By manufacturing the width of the base and the height of the pipe support portion in accordance with the design specifications, the work of allocating the pipe position at the construction site becomes unnecessary. 2. Since the pipe support and the pipe are integrated, the pipe fixing work at the construction site is not required. 3. Since the base portion is laid without gaps, a formwork such as a control panel is not required. 4. Since no formwork is used, dismantling work after concrete placement and disposal are not required. 5. Since the pipe support acts as a rib perpendicular to the base, the number of supports for supporting the slab during concrete casting can be reduced. As a result, work on the construction site is reduced and the construction period can be shortened, and at the same time, it contributes to cost reduction, resource saving and environmental improvement.

[0022]

As described above in detail, the hollow slab structure of the present invention is formed by arranging a plurality of hollow slab forming members side by side and casting concrete on the hollow slab forming members. Since the hollow part is formed and the hollow body supporting part acts as a rib that runs through the center of this hollow part, the process of forming the hollow slab structure can be greatly rationalized, and the use of formwork is omitted. The remarkable effect that can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view including a cross section of a main part of a hollow slab forming member of a first embodiment.

FIG. 2 is a sectional view of a hollow slab using the same hollow slab forming member.

FIG. 3 is an external perspective view of the hollow slab.

FIG. 4 is a perspective view of a hollow slab forming member according to a second embodiment, including a cross section of a main part.

FIG. 5 is a perspective view of a hollow slab forming member according to a third embodiment, including a cross section of a main part.

DESCRIPTION OF SYMBOLS 1, 1 ', 1 "Hollow slab forming member 2 Base 3 Pipe support 4 Pipe half member 5 Reinforcement rib 6 Distributing muscle insertion hole 7 Concrete 9 Hollow

Claims (3)

(57) [Claims] 1. A side of a long member having an L-shaped cross section is defined as a base and the other vertical side is defined as a hollow body support, and the hollow body is divided in half near a tip of a base side surface of the hollow body support. A hollow slab forming member formed by integrally forming a half member having a cross-section, the hollow body supporting portions are adjacent to each other back to back, and the base portion is horizontal and hollow.
A hollow slab structure in which a plurality of sets are arranged side by side so that an assembly cross section of the body has a hollow cross section having a vertical section at the center, and concrete is cast thereon. 2. The hollow slab forming member is formed of a long material having a U-shaped cross section, and a common side thereof is used as a base, and vertical sides of both ends of the base are used as hollow body support parts. the halves of the cross-section of the hollow body and half to the tip side of the surface facing the base are integrally formed, assembled cross-section of the hollow body at the center
2. The hollow slab structure according to claim 1, wherein the hollow slab structure is formed by forming a hollow cross section having a partition that cuts longitudinally . 3. A long side member having an L-shaped cross section is defined as a base, and the other vertical side is defined as a hollow body support section. A pair of long members are joined so that a hollow body having a part of the outer circumference cut into a slit shape in the longitudinal direction is inserted from the upper end of the hollow body support portion, and the assembly cross section of the hollow body is vertically cut at the center.
A hollow slab structure formed by arranging a plurality of hollow slab forming members integrally formed in a hollow cross section and casting concrete thereon.