JP3364051B2 - Substrate for concrete slab partially lacking embedding material, concrete slab construction method using the substrate, and its structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheath for a synthetic resin electric wire pipe (CD pipe) used as a shield for electric wiring, telephone wiring, etc., for water supply, hot water supply pipe, etc., inside a concrete slab of a structure. The present invention relates to a concrete slab substrate that enables easy laying of various equipment pipes such as pipes, a concrete slab construction method using the substrate, and a structure having the substrate.

[0002]

2. Description of the Related Art In recent years, floor structures of concrete apartment houses are generally finished with a straight floor or a straight ceiling from the viewpoint of economical efficiency, and pipes for various facilities are directly buried inside a concrete slab. It has become so. On the other hand, as a construction method for a concrete slab, as shown in FIG. 5, an embedding material 1 having a hollow portion inside made of a synthetic resin foam molded article such as expanded polystyrene, for the purpose of reducing the weight and improving the sound insulation effect. Are placed on a concrete substrate 3 having truss bars 2 at a predetermined interval during the curing process in which the concrete is uncured, and are locked by a locking tool. Using the substrate A for hollow concrete slab, which is fixed and fixed to the concrete substrate 3, the substrate A for concrete slab is carried into the construction site, and as shown in FIG. 6, the necessary number is arranged between the beams B and B of the frame However, after the slab upper end streak 4 and the like have been attached, a construction method of placing a cast-in-place concrete C to construct a so-called hollow concrete slab CS is widely used. 7 and 8
Is an example of the embedding material 1, and has a box-like (rectangular) shape as a whole having the top plate portion 10, the side wall portion 11, and the partition wall 12, and has a relatively large bottom with one side open inside. It has a plurality of hollow portions S each having an area (Japanese Patent Publication No. 57-470).
08 gazette etc.). The hollow portion S is provided for the purpose of reducing the weight of the embedding material 1 and saving the material.

Then, in performing the burying work of the pipe as described above in the concrete slab CS using the burying material 1 as described above, as shown in FIG. 9, between the burying material 1 and the burying material 1. The above-mentioned equipment pipe P is arranged in the space SS for filling the cast-in-place concrete formed in 1, and the cast-in-place concrete is poured from above. for that reason,
It is inevitable to take a detour for piping between the two target points, and a piping distance longer than originally necessary is required. In addition, the amount of concrete to be placed is reduced by the volume occupied by the pipes.

[0004]

When the number of pipes to be buried in the concrete slab is small, the increase in the pipe distance has a small effect on the construction cost, and there is no particular problem. Also, even if a pipe is placed in the space for filling the cast-in-place concrete between the potting material and the cast-in-place concrete is placed from above, the cast concrete will spread densely in the space. Since it is possible to reduce the amount of cast concrete, the concrete slab does not cause a significant cross-section loss.

However, in the concrete-type housing complex constructed in recent years, in addition to the conventional piping for electricity and telephone lines, wiring for satellite broadcasting, cable broadcasting, etc., piping for home security equipment, and further Various pipes such as pipes for water supply and hot water supply pipes are being buried in concrete slabs, and there is a tendency for each room to have its own outlet. , The number of branches required for distribution of electricity, water, etc. is increasing, and the piping distance is also increasing.

For this reason, as shown in FIG. 9, a large number of pipes P are arranged in the concrete filling space SS, and if sufficient attention is not paid at the time of pouring the cast-in-place concrete, the space P will be filled. In SS, concrete may not densely enter and a void may be formed between the pipe P and the pipe P. Also, since the amount of concrete to be placed is reduced, sufficient construction management is required from this aspect as well. Furthermore, arranging a large number of pipes while circumventing the concrete-filling space portion formed in a grid shape requires a lot of work, and also increases the pipe distance.

[0007] It has also been performed in part to shorten the pipe distance by partially cutting or grooving an embedding material to form a passage for piping at a construction site and performing piping through the passage. However, it is not easy to add processing to the embedding material on site, and when the embedding material is processed, the machined surface of the embedding material may communicate with the hollow part. When concrete is poured, there is a risk that the cast-in-place concrete will enter the hollow portion from the open surface and the weight of that portion will become excessive. This reduces the porosity of the concrete slab.

The object of the present invention is to eliminate the above-mentioned problems that occur when a large number of equipment pipes are embedded in a concrete slab having an embedding material made of a synthetic resin foam molded product inside. Especially.

[0009]

A concrete slab substrate according to the present invention for solving the above-mentioned problems has a hollow or solid embedding material made of a synthetic resin foam molded article on a concrete substrate at predetermined intervals. A concrete slab substrate that is arranged, characterized in that the embedding material is not arranged at a location where piping is planned to be laid when the concrete slab substrate is constructed using the concrete slab substrate. .

Further, the present invention provides a method for constructing a concrete slab using the above concrete slab substrate by laying the above concrete slab substrate at a site where piping is planned and burying the concrete slab substrate. Disclosed is a method for constructing a concrete slab, which comprises performing a necessary piping work by passing through a place where an insert material is not arranged, and then pouring a cast-in-place concrete from the place. In a more preferred embodiment of the above-mentioned construction method, after the piping work through the portion where the embedding material is not arranged, it is preferably composed of a synthetic resin foam-molded product for the portion where the embedding material is to be originally arranged. Another embedding material is fixed and fixed, and then cast-in-place concrete is poured.

In another aspect of the method for constructing a concrete slab according to the present invention, after performing the necessary piping work through a portion of the substrate for the concrete slab where the embedding material is not arranged, the embedding material is The portion where the embedding material is originally not disposed is covered with another embedding material, preferably a synthetic resin foam-molded product, having at least a downwardly open space into which the pipe can be inserted from above. And fix it, and then pour in-place concrete from above. This other embedding material may have a space part that opens downward from the beginning, and it is an embedding material that initially has a solid body or a hollow part, and the space may be changed depending on the piping conditions at the construction site. You may make it form a part. In that case, by embedding a solid or hollow embedding material in the pipe part from above to form a crushed part along the pipe on the surface and forming a space part along the crushed part, it is easy. The required space can be obtained.

The present invention also discloses a structure having the above-mentioned concrete slab substrate as a substrate for the concrete slab.

[0013]

[Operation] According to the substrate for concrete slabs of the present invention, the embedding material does not exist on the concrete substrate from the beginning at the place where piping is planned when the concrete slab is constructed. Therefore, the laying of piping can be performed easily and without being hindered by the embedding material (and thus without taking the detour route) as in the conventional concrete slab substrate in which the embedding material is arranged all over. It becomes possible to carry out with a short piping distance. After finishing the necessary piping, preferably, another embedding material made of a synthetic resin foam-molded product cut into a required size and shape is placed and fixed at a place where the embedding material is to be originally placed, or After fixing another embedding material with an open space on the lower surface side from above, fix it.After that, if necessary, perform the same work as the conventional construction method such as attaching the slab upper end streak, and then cast in-place concrete. Then, the concrete slab execution method according to the present invention is completed.

In the concrete slab in which the substrate for concrete slab according to the present invention is laid, it is possible to avoid the conventional arrangement of a large number of pipes in the space SS for casting concrete in a concentrated manner. Insufficient integration of cast-in-place concrete and concrete substrate and generation of voids due to equipment piping in the space can be avoided. In addition, since multiple pipes are placed in the place where there is no embedding material, a certain porosity can be achieved despite the absence of embedding material, and the function as a hollow concrete slab is maintained. .

[0015]

The present invention will be described in more detail based on the following examples. FIG. 1 is a plan view schematically showing an example of a concrete slab CS portion of a structure in which a concrete slab substrate A is arranged between the beams B and B of a frame as shown in FIG. 6, for example. In FIG. _5, five concrete slab substrates A (A _{1 to} A ₅ ) are arranged.
In this concrete slab CS, a pipe box V ₁ is attached to a _second concrete slab substrate A ₂ as shown in the drawing, and from there, toward the outlets 21, 22, 23 provided on the three side walls. , Various equipment pipes P1, P2 for electric wires or water as described above,
It is designed so that P3 can be placed, and the piping boxes V ₂ and V ₃ are also attached to the fourth concrete slab board A ₄ and the fifth concrete slab board A ₅ for both pipes. Piping P between boxes V ₂ and V ₃
It is designed to connect with 4. An embodiment of the present invention will be described below by taking the case of constructing a concrete slab according to these design conditions as an example.

In this case, when manufacturing the concrete slab substrates A _{1 to} A ₅ at the factory, the following five different structures are prepared. That is, as shown in the drawing, when performing the piping work at the construction site, the concrete slab substrate A ₁ is 3 from the right in FIG.
The pipe P2 passes through the embedded materials x1 to x3 indicated by the diagonal lines located in the row. Therefore, when manufacturing this concrete slab substrate A _{1 in} a factory, the standardized embedding material 1 as shown in, for example, FIGS. 7 and 8 is excluded except for the embedding materials x1 to x3 indicated by diagonal lines.・ ・ Place and fix. Depending on the case, a solid embedding material may be used.

In the concrete slab substrate A ₂ , as shown in the drawing, two embedding materials x4 and x5 shown in the third row from the right and shown on the left and right of the embedding material x5. Connect the four embedded materials x6 to x9 to the pipe P
1, P2, P3 pass through. Therefore, when manufacturing the substrate A ₂ for concrete slab, the standard hollow or solid embedding materials 1 ... Are arranged and fixed except for the six embedding materials x4 to x9 shown by diagonal lines.

On the concrete slab substrate A ₃ part,
As shown, there are no plans to lay the plumbing. Therefore, as for the concrete slab substrate A ₃ , standardized hollow or solid embedding materials 1 ... Are arranged and fixed over the entire surface of the concrete substrate, as in the conventional case. In the concrete slab substrate A ₄ , as shown in the figure, the pipe P4 passes through only the embedded materials x10 and x11 indicated by the two diagonal lines from the top in the fourth row from the right, and the concrete slab substrate A ₅ In, the pipe P4 passes only the lowest embedding material x12 in the third row from the right and the two embedding materials x13, x14 indicated by the diagonal lines in the middle of the second row from the right. Therefore, the concrete slab substrates A ₄ and A
_{In 5} , the embedding materials x10 and x11, and x
A standard hollow or solid embedding material 1 ... Is arranged and fixed except for the 12 to x14 portion.

The above-mentioned substrate A for concrete slab
_{1 to} A ₅ are manufactured in the same manner as in the case of the conventional concrete slab substrate disclosed in, for example, JP-B-57-47008, except that the embedding material is not arranged at a specific position. When constructing concrete slabs, multiple types of concrete slab substrates (A _{1 to} A ₅ ) manufactured in the factory as described above in accordance with the piping design status of the concrete slabs in each dwelling unit or each floor
However, they will be brought together to the construction site of the structure. At the construction site, the concrete slab substrates having different shapes are arranged between the beams B and B of the frame according to the design drawing, and the predetermined pipes P1 to P4 are assembled through the portion where the embedding material is not arranged. Then, if the design conditions of the structure allow, the construction of the concrete slab is completed by arranging the slab upper end bar and the like and then pouring in-place concrete, as in the conventional method.

FIG. 2 is a perspective view showing an example of the concrete slab board A according to the present invention described above. In the figure, the embedding material 1u portion indicated by the dotted line is not attached to the concrete board from the beginning of manufacture. A conventional standard hollow or solid embedding material 1 is fixed and fixed to the other portions (note that trusses are omitted in FIG. 2 for ease of illustration). And in this example,
A pipe box V is embedded in a part of a portion of the concrete substrate 3 where the embedding material is not arranged, and as shown in the drawing, the pipe P is attached through a portion where the embedding material is not arranged. The place to be piped is flat, there are no obstacles, and it is easy to pipe.

In the construction of the hollow concrete slab using the concrete slab substrate according to the above-mentioned embodiment, only the pipe P runs at the portion where the embedding material is missing, and the in-situ concrete is poured as it is. When installed, the amount of poured concrete in that part may exceed the design allowable value. FIG. 3 is an example of the countermeasure, and shows a state in which another embedding material 1a ... Is fixed to a portion where the embedding material is originally to be arranged and the pipe P is not located. The embedding material 1a, ... May be a solid synthetic resin foam plate cut into an appropriate size at the construction site, and is attached to the concrete substrate 3 by an appropriate fixing means such as a concrete nail or an adhesive. It is desirable that the thickness of the embedding material 1a ... Is the same as the height of the surrounding standard embedding material 1 ..., and the shape after mounting is the same as the outer shape of the standard embedding material. However, the height and the shape may be arbitrary as long as the design conditions allow. Further, it may have a hollow portion instead of a solid material.

FIG. 4 shows another example of the embedding material used for this countermeasure. The embedding material 1b is preferably formed in a rectangular shape as a whole, and the peripheral wall portion 1 thin on four circumferences.
1b and also has a large number of projections 12b ... Tapered downward, forming a continuous space Sb open to the lower surface inside (in the figure, upper and lower Inverted). A large number of the embedding materials 1b are manufactured as standard products at the factory and brought to the construction site. At the construction site, after finishing the piping work as described above, a part of the surrounding side wall 11b is cut off according to the position of the pipe to open the pipe insertion port Po, and the embedding material 1 is originally present. Fix it by covering it from above. This embedding material 1b has a large number of protrusions 12b, which are tapered downward on the back side, and therefore can be easily covered from above regardless of the position of the pipe, and the pipe is formed there. It is accommodated in the continuous hollow portion Sb.

The embedding material 1b preferably has the same outer shape as the standard embedding material 1, but may have any shape within the range allowed by the design conditions. Further, the shape of the protrusion 12b is not limited to the conical protrusion as shown in the figure, and may be a prismatic shape. The use of such an embedding material has an advantage that the hollow ratio of the concrete slab after the in-situ concrete construction can be more averaged when the standard embedding material 1 having a hollow portion is used. The embedding material 1b is preferably a synthetic resin foam molded product, but may be a synthetic resin molded product.

Although not particularly shown, a hollow or solid embedding material as a standard product can be used as it is as another embedding material for covering the pipe portion from above. In that case, the embedding material as the standard product is first pressure-welded from above the already piped portion. By pressure contact, since a recess along the pipe is formed on the surface of the embedding material, a groove (space) of a required size that allows the pipe to enter along the recess is formed by an appropriate means, Put it over the pipe. Of course, depending on the condition of the pipe, the recessed groove (space portion) of a desired size may be directly formed without forming a recess by pressure contact.

As can be seen from the above description, according to the present invention, it is necessary for the equipment to be placed in the space for filling the cast-in-place concrete which is conventionally formed between the potting materials. By using the substrate for concrete slab according to the present invention, it becomes possible to lay the pipe easily and with a short pipe distance as planned at the time of design. Also,
In the illustrated example, the case where one pipe is laid is explained, but
By using the concrete slab substrate A of the present invention, it is possible to arrange a plurality of pipes at the same time in a plane. In that case, the arranged pipes themselves function as a void forming material. As described above, the hollow ratio of the concrete slab can be sufficiently averaged without using the other embedding material 1a or 1b.

Naturally, the embedding material 1 as a standard material to be arranged has an arbitrary shape, and the embedding material is provided with an opening for removing steam generated during curing of the concrete substrate from the hollow portion S. Material (see Japanese Patent Laid-Open No. 5-208410)
Etc. can also be used effectively. Furthermore, the mounting of the embedding material on the concrete substrate is also limited to the one that is attached by the fastener in the conventional uncured state of the concrete. Or a method of fixing after concrete hardening, using a locking tool such as concrete nails, an adhesive, an adhesive tape, or the like (Japanese Patent Laid-Open No. 5-2084).
No. 11), etc. can also be used.

[0027]

As is apparent from the above description, by using the concrete slab base material according to the present invention,
Piping work when constructing a concrete slab becomes easy and the piping distance can be shortened.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a concrete slab constructed using a concrete slab substrate according to the present invention.

FIG. 2 is a perspective view illustrating a concrete slab substrate according to the present invention and a usage state thereof.

FIG. 3 is a perspective view illustrating another usage state of the concrete slab substrate according to the present invention.

FIG. 4 is a perspective view showing another embedding material used when constructing a concrete slab according to the present invention.

FIG. 5 is a bird's-eye view showing a conventional concrete slab substrate.

FIG. 6 is a view showing an example of a concrete slab and a structure using a conventional substrate for concrete slab.

FIG. 7 is a diagram showing an example of an embedding material.

FIG. 8 is a diagram showing an example of an embedding material.

FIG. 9 is a diagram illustrating a piping state using a conventional concrete slab substrate.

[Explanation of sign]

A ... Concrete slab substrate, P ... Piping, V ... Piping box, 1 ... Embedding material, 3 ... Concrete substrate

Claims (5)

(57) [Claims] 1. A concrete slab substrate in which embedding materials made of a synthetic resin foam-molded product are arranged on a concrete substrate at a predetermined interval, and at the time of constructing a concrete slab using the concrete slab substrate. A substrate for a concrete slab, in which the embedding material is not placed at a place where piping is planned to be laid. 2. A concrete slab substrate, wherein the concrete slab substrate according to claim 1 is laid at a site where piping is planned, and the concrete slab substrate passes through a place where no embedding material is arranged. A method for constructing a concrete slab, characterized in that the necessary piping work is performed, and then the cast-in-place concrete is placed from above. 3. After the piping is performed, another embedding material is placed and fixed on a portion where the embedding material is not arranged and the piping is not arranged, and then a cast-in-place concrete is poured. The method for constructing a concrete slab according to claim 2, wherein 4. The concrete slab substrate according to claim 1 is laid on the body side, and a necessary piping work is performed by passing through a place where the embedding material is not arranged, and the embedding material is arranged. Characterized by placing another embedding material that has a space that opens at the bottom where at least piping can enter into the unfilled part, and fixing it from above, and then pouring cast-in-place concrete from above Construction method for concrete slabs. 5. A structure having the substrate for concrete slab according to claim 1 as a substrate for concrete slab.