JP3373484B2 - Double slab structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double slab structure for increasing the weight and weight of a concrete slab. 2. Description of the Related Art Conventionally, in a double slab structure of a concrete structure, a lightweight block such as styrene foam has been buried inside the concrete, and is applied to, for example, a basement of a concrete structure. A drainage unit for underground structures having a double slab structure has been proposed (Japanese Utility Model Laid-Open No. 13344/1991). In this underground structure drainage unit, as shown in FIG. 4, a large number of columnar legs 52 project from the lower surface of a plate 51 made of synthetic resin foam. A hollow bottomed columnar leg 5 having a cavity whose upper surface is open at some of the central part (or some of the four peripheral parts and the central part)
2a, the other columnar legs are solid columnar legs 52b, and these columnar legs 52 are regular so that the columnar legs of another plate can be received between adjacent columnar legs. They are scattered at intervals. If the drainage unit for underground structures having such a configuration is laid without gaps on the lower slab (basic concrete) 53 and concrete of the upper slab 54 is poured on it, the columnar leg 52 The space functions as a drain passage, and since the hollow portion of the hollow bottomed columnar leg portion 52a is filled with concrete, the drain unit is prevented from being crushed by the compressive force from the upper slab. Bond becomes strong. Further, since the drainage units can be stacked on each other by inserting their columnar legs between the columnar legs of another drainage unit, the bulk is reduced, so that transportation and storage are facilitated. [0005] However, in the case of the conventional drainage unit for underground structures as described above, it cannot be stacked in a plurality of stages, and is applied to the case where the height of the double slab is increased. Can not do. In addition, although the strength is improved by filling some of the numerous columnar legs with concrete, the columnar legs filled with concrete have a bottom and integrate the upper slab and the lower slab. Can not do. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to easily construct a lightweight double slab having a large slab height, and to form an upper slab and a lower slab. Is to provide a double slab structure capable of connecting and integrating the same. SUMMARY OF THE INVENTION The present invention is directed to a lower portion made of a synthetic resin foam (such as styrofoam) having a plurality of hollow columnar legs and solid columnar legs projecting from the lower surface of a plate. A block, and an upper block made of a synthetic resin foam (styrene foam or the like) in which a through-hole continuous with the through-hole of the hollow columnar leg is formed in a plate-like body, and the lower block is disposed on a lower slab. Then, at least one upper block is stacked on the lower block, concrete is poured into continuous through holes of the lower block and the upper block, and an upper slab (cast-in-place concrete or precast concrete) is placed on the upper block. It is a double slab structure characterized by being provided. In the above construction, the lower block and the upper block made of a synthetic resin foam disposed between the upper slab and the lower slab can easily reduce the weight of the double slab having a large slab height. Can be built.
In the lower block and the upper block, a vertically continuous through-hole is formed, and a concrete column is constructed by casting concrete into this through-hole, and the lower slab and the upper slab can be connected and integrated. Also, the compressive strength of the slab can be increased. Further, a drainage space and a drainage passage are formed at the lower portion of the lower block by a plurality of columnar legs, and can be used for drainage.
Furthermore, by using the lower block and the upper block made of a synthetic resin foam, a drainage basin, piping, and the like can be easily installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 shows an example of the basic configuration of the double slab structure of the present invention. FIG. 2 shows an example of a drainage basin section in the external structure of the double slab structure of the present invention. FIG. 3 shows an example of a pipe section in an external structure having a double slab structure according to the present invention. In FIG. 1, the double slab structure of the present invention comprises a lower block 3 for drain and an upper block 4 for raising between a lower concrete slab 1 and an upper concrete slab 2. Have been. The lower block 3 for drain is made of a synthetic resin foam such as styrene foam, and has a rectangular plan view.
It comprises a plate-like body 10 having a vertical and horizontal dimension of, for example, about 1 m, and a number of columnar legs 11 integrally projecting downward from the lower surface of the plate-like body 10. The columnar leg 11 is a columnar column (having a taper that slightly narrows downward as a draft during molding), and includes a hollow columnar leg 11a and a solid columnar leg 11b. Become. The hollow columnar leg 11a and the plate-like body 10 are provided with through holes 12 penetrating vertically. Note that the columnar leg 11 is not limited to a columnar shape, and may be a square columnar shape or the like. The columnar legs 11 are arranged at intervals in the vertical and horizontal directions in plan view, and the hollow columnar legs 11a are arranged, for example, every other in the vertical and horizontal directions. In addition, the columnar leg 11
Are interspersed at regular intervals so that the columnar legs of another plate-like body can be received between adjacent columnar legs. During storage and storage, the bulk is reduced. The upper block 4 is also made of a synthetic resin foam such as styrene foam. For example, a plurality of through holes 21 vertically penetrating a rectangular parallelepiped plate 20 having a length and width of about 1 m and a height of about 0.3 m are formed. It is configured to be installed. It is preferable that the plate-shaped body 20 has the same planar shape as the plate-shaped body 10 of the lower block 3. The through holes 21 of the upper block 4 have a circular cross section, and are regularly arranged so as to be continuous with the through holes 12 of the lower block 3 when stacked on the lower block 3. Concrete columns 5 are formed by placing concrete in the through holes 12 and 21 which are to be formed. The diameter of the through-hole 21 is larger than the diameter of the through-hole 12 to improve the flow of concrete and to ensure that concrete is filled to the bottom. The cross section of the through hole 21 is not limited to a circle, but may be a square or the like. The upper block 4 is stacked on the lower block 3 in one or more stages. here,
On the upper surface and the lower surface of the plate-like body 20 of the upper block 4, a protrusion 20a and a recess 20b for preventing slippage that can be fitted to each other are provided (see FIG. 1A) so that positioning and connection integration can be performed. To facilitate stacking work. Although not shown, a convex portion or a concave portion may be provided on the upper surface of the lower block 3. In the above construction, a number of lower blocks 3 for drain are laid out on the lower concrete slab 1 without gaps, and an upper block 4 for raising is placed on this lower block 3 in one or more stages. The reinforcing bars are arranged as necessary in the through-holes 12 and the through-holes 21 that are vertically continuous, concrete is poured, and the concrete columns 5 are constructed. The upper concrete slab 2 is formed on such an upper block 4 by laying a prefabricated reinforcing bar or the like and laying concrete or laying a precast concrete plate. It is preferable that the lower concrete slab 1 and the upper concrete slab 2 and the concrete column 5 be integrated with a stud or the like. Next, a finishing material is provided on the upper concrete slab 2 to complete the double slab structure raised by the lightweight block. A drain block and a drain passage are formed on the lower concrete slab 1 by the drain lower block 3. In the lower block 3 and the upper block 4, a number of concrete pillars 5 connecting the upper and lower concrete slabs 1 and 2 are constructed, and the upper and lower concrete slabs 1 and 2 are connected and integrated to form a large and lightweight slab. A double slab is built. In the external drainage basin shown in FIG. 2, notches are provided at adjacent corners of the four lower blocks 3 and the upper block 4 in a plan view, and the formed rectangular space is formed in a plan view. A precast basin 30 is provided.
A leveling concrete 32 is poured into the lower part of the precast basin 30 via a raising material 31. A sleeper 33 is laid on the upper concrete slab 2 as a finishing material. In the external piping section shown in FIG. 3, the lower block 3 and the upper block 4 are disposed with a space 40 having a predetermined width at the piping location, and a pipe 41 is disposed in the storage space 40. The pipe 41 is supported by a support base (not shown) or the like. In the case of a thin pipe, the storage space 40 is formed by cutting out the end of the plate 20 of the upper block 4, and the pipe 41 is arranged and supported in the storage space 40. The upper part of the pipe 41 is covered with a lid block 42 made of styrene foam or the like or a plastic plate 43. In the case of a thin pipe, the plate 20 serves as a lid. In addition, a predetermined gap is provided between the upper surface of the pipe 41 and the pipe 41 so that no force is applied to the pipe 41 from above. In addition, piping 4
A lower block 3 'and an upper block 4' for special concrete columns can be arranged on both sides of 1 to increase the strength. Although an example in which the present invention is applied to the exterior of a building has been described above, it goes without saying that the present invention can be applied to other double slab structures. Further, it is needless to say that the plate-shaped body is not limited to styrene foam (polystyrene), and a synthetic resin foam such as foamed polyurethane can be used. According to the present invention having the above-described configuration, the following effects can be obtained. (1) By using a lower block and an upper block made of a synthetic resin foam disposed between the upper slab and the lower slab, a double slab having a large slab height and a reduced weight can be easily constructed. Can be. (2) A vertically continuous through-hole is formed in the lower block and the upper block, and a concrete column is constructed by pouring concrete into the through-hole, and the lower slab and the upper slab are connected and integrated. And the compressive strength of the slab can be increased. (3) A drain space and a drain passage are formed at the lower part of the lower block by a plurality of columnar legs, and can be used for drain. (4) By using the lower block and the upper block made of synthetic resin foam, drainage basins, pipes, and the like can be easily installed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an example of a basic configuration of a double slab structure according to the present invention, in which (a) is an exploded perspective view of a block portion, and (b) is an overall sectional view. FIG. 2 is an example of an external drainage basin having a double slab structure according to the present invention, where (a) is a plan view and (b) is a cross-sectional view. 3A and 3B are examples of an external piping section having a double slab structure according to the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view. FIG. 4 shows a conventional drainage unit for underground structures, (a) is a plan view of the drainage unit, (b) is a side view thereof, and (c) is an underground structure using the drainage unit. FIG. [Description of Signs] 1... Lower concrete slab 2... Upper concrete slab 3... Drain lower block 4... Raising upper block 5... Concrete pillar 10. ... Column legs 11a of lower block Hollow columnar legs 11b Solid columnar legs 12 Through holes 20 of lower block Plate members 20a of upper block Projections 20b Depressions 21 Upper block Through hole 30 of precast basin 31 Raising material 32 Leveling concrete 33 Finishing material (sleepers) 40 Storage space 41 Piping 42 Lid block 43 Plastic plate

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 31/02 E04B 1/16 E04B 5/43

Claims (1)

(57) [Claim 1] A lower block made of a synthetic resin foam having a large number of hollow columnar legs and solid columnar legs projecting from the lower surface of the plate-like body, and a plate-like body An upper block made of a synthetic resin foam having a through-hole continuous with the through-hole of the hollow columnar leg portion, wherein the lower block is disposed on a lower slab, and the upper block is disposed on the lower block. A double slab structure comprising: stacking at least one block; casting concrete in a continuous through hole of a lower block and an upper block; and providing an upper slab on the upper block.