JP7412249B2 - Construction method of building entrance structure - Google Patents

Description

The present invention relates to a construction method for a building entrance structure .

A cloth foundation or a solid foundation is applied to the foundation of a building, and the exterior walls are placed on top of these foundations. Taking a cloth foundation as an example, backfilling soil is constructed up to the upper part of the footing that forms the cloth foundation, and earth floor concrete (or retaining concrete) is constructed on top of the backfilling soil.

When looking at the entrance of the building, as shown in the plan view shown in Figure 1 (plan view seen from above the cloth foundation) and the vertical cross-sectional view shown in Figure 2 (view taken along arrow II-II in Figure 1), For example, a cloth foundation 20 having a footing 21 and a rising portion 22 is constructed to surround the entrance dirt floor 10 which is rectangular in plan view (square in the illustrated example), and the cloth foundation 20 further extends around the outer wall of the building. Extend to support. By closing the cloth foundations 20 in this way, the backfill soil 28 for the earthen floor is backfilled and raised inside the closed cloth foundation 20, and the surface finish concrete 60 is constructed above the backfill soil 28 for the earthen floor. As a result, the entrance structure 70 is formed. That is, by closing the cloth foundation 20 as shown in the illustrated example, the backfilling soil 28 for the dirt floor can be retained. For example, mortar or the like is laid above the surface-finished concrete 60, and a surface finish is applied by pasting tiles or the like on the surface of the mortar or the like.

Of the cloth foundations 20 surrounding the entrance earthen floor 10, a porch 25 is constructed on the side of one of the cloth foundations 20 facing the outside of the building, and above the cloth foundation 20 corresponding to this porch 25 is an entrance. A door 27 is attached so that it can be opened and closed. Further, a dirt floor concrete 30 is constructed on the side of the entrance room 15 of the building from the entrance structure 70, a plurality of bundles are fixed on the dirt floor concrete 30, and a large pull is placed on the bundles. First floor flooring is supported on top of the drawers (none of which are shown).

In this way, in the conventional entrance structure 70, the cloth foundation 20 needs to be constructed in a closed form in order to retain the earth floor backfill soil 28 below the entrance earthen floor 10. The problem is that the amount is often large and construction time is required. This issue regarding construction time naturally occurs when constructing a new building, but it also occurs when renovating a building, such as adding or changing an entrance (this entrance includes a back door). can occur. In addition, since the height is being raised with backfill soil, it becomes necessary to widen the width of the footing in the cloth foundation 20 in order to resist the earth pressure due to the backfill soil, which causes another problem such as increasing the scale of the cloth foundation 20. There is also a problem, and an increase in the scale of the cloth foundation 20 also leads to further increase in the time and effort required to construct the cloth foundation 20.

Therefore, a foundation structure has been proposed in which the weight of the foundation is reduced by reducing the weight of the backfill material. Specifically, the space inside the concrete floor is filled with a material such as styrene foam mixed with cement, which is then hardened to create a lightweight foundation structure (for example, Patent Document 1, (see 2).

Japanese Patent Application Publication No. 2000-120077 Japanese Patent Application Publication No. 5-112950

However, the foundation structures described in Patent Documents 1 and 2 are both constructed by filling a space surrounded by a cloth foundation with a material such as styrene foam mixed with cement. It is necessary to surround the space to be filled with a cloth foundation. In that it has a structure surrounded by a cloth foundation, it is no different from the conventional entrance structure 70 already described with reference to FIGS. 1 and 2, and therefore, the technology includes the above-mentioned problem of requiring a lot of construction work. There is no change in the fact that it is.

Therefore, as shown in FIGS. 3 and 4, the construction of the foundation on the side of the entrance room 15 was eliminated, and after constructing the earthen floor concrete 30 inside the L-shaped cloth foundation 20 in plan view as shown in FIG. An entrance structure 80 is separately proposed, which is formed by installing a standard-shaped and as light-weight raising block material 35 on top of the entrance structure 30 and constructing surface finishing concrete 60 on top of the block material 35. There is.

However, in this entrance structure 80, the weight of the surface finish concrete 60 is completely supported by, for example, the lightweight block material 35, so there is a new problem inherent in the stability of supporting the surface finish concrete 60. .

The present invention has been made in view of the above-mentioned problems, and provides an entrance structure for a building that can reduce the amount of foundation construction around the entrance earthen floor and stably support surface finishing concrete. The purpose is to provide a construction method.

In order to achieve the above object, one aspect of the building entrance structure according to the present invention is as follows:
dirt floor concrete,
It has a raised block material arranged above the earthen floor concrete and forms an entrance earthen floor, and a surface finish concrete arranged on the upper surface of the raised block material,
A cloth foundation is provided at a position corresponding to the outer wall of the building among the periphery of the entrance earthen floor, and a cloth foundation is not provided at a position corresponding to the inside of the entrance of the building;
The block material is provided with a communication hole that communicates with the dirt floor concrete from the lower surface in contact with the dirt floor concrete to its upper surface, and a concrete bundle is provided in the communication hole, and the concrete bundle is connected to the surface finish concrete. It is characterized by supporting.

According to this aspect, by applying the block material for raising the level on the concrete of the entrance earthen floor, the shape of the block material does not collapse, making it unnecessary to surround the area around the entrance earthen floor with a foundation such as a cloth foundation. . Therefore, the construction of the foundation at a position corresponding to the inside of the entrance room of the building (the cloth foundation 20 on the side of the entrance room 15 in FIGS. 1 and 2) is not required, and the amount of foundation construction can be reduced. Furthermore, the concrete bundle can suppress mutual displacement of block materials during an earthquake. Here, the term "entrance" includes not only a normal entrance that is the main entrance to a building, but also a back door, and also includes an indoor terrace provided inside a sweeping window. Furthermore, "foundation" includes cloth foundations and solid foundations, and refers to reinforced concrete foundations with embedded reinforcing bars (including both site-constructed foundations and precast foundations).

The block material for raising the height is a standard block material, and the height of the entrance dirt floor may be raised with a single block material, or the height of the entrance dirt floor may be raised by stacking multiple blocks. You can. Furthermore, various block materials can be used as the block material, such as a lightweight block material, a lightweight block material with heat insulating properties, and a hard block material. In addition, a surface finishing layer is formed on the surface layer of surface finishing concrete using mortar, adhesive, etc., and the surface finish of the entrance can be improved by affixing tiles on the surface at predetermined intervals or by pasting sheets. administered.

In addition, in this aspect, the raising block material placed on top of the dirt floor concrete is provided with a communication hole communicating with the dirt floor concrete from the lower surface in contact with the dirt floor concrete to its upper surface. A concrete bundle is provided and the concrete bundle supports the facing concrete. For example, when fresh concrete for surface finishing concrete is poured, a portion of the fresh concrete flows into the communicating holes and hardens inside the communicating holes, thereby forming a concrete bundle. According to this forming method, since concrete bundles are automatically formed during construction of surface finishing concrete, concrete bundles can be efficiently formed in communicating holes.

Further, when the fresh concrete hardens inside the communication hole to form a concrete bundle, the lower end of the concrete bundle is fixed to the concrete on the earthen floor below. This can prevent the raising material made of a block material with a concrete bundle inside from shifting laterally with respect to the earthen floor concrete. Incidentally, if necessary, a concrete bundle made of reinforced concrete may be formed by accommodating reinforcing bars in the communicating holes and embedding the reinforcing bars in fresh concrete during surface finishing concrete construction. In this aspect, it is desirable that a plurality of communication holes be provided and that the surface finishing concrete be supported by a plurality of concrete bundles specific to each communication hole.

In the entrance structure of this aspect, a concrete bundle is provided between the surface finishing concrete and the dirt floor concrete, the surface finishing concrete is supported by the concrete bundle, and the weight of the surface finishing concrete is transmitted to the dirt floor concrete via the concrete bundle. This eliminates the need for the block material to support the weight of the surface-finished concrete, making it possible to stably support the surface-finished concrete.

Further, in another aspect of the entrance structure for a building according to the present invention, the block material has a rectangular shape in a plan view, and a notch is provided at a corner of the rectangle in a plan view,
It is characterized in that a plurality of the block materials are arranged side by side with each other, and the communication hole is formed by the cutout provided in the adjacent block materials.

According to this aspect, the plurality of block materials having a rectangular shape in plan view are provided with notches at the corners, and when the plurality of block materials are arranged side by side, the adjacent notches form communication holes. , each block material and concrete bundle can be brought into close contact with each other. That is, adjacent block materials can be connected to each other via the concrete bundle, and the integrity of the raised material is improved.

Here, for example, when four block materials are placed side by side to form a raised material that is rectangular in plan view, a total of four notches at the corners of the four block materials communicate with each other in the center. A hole is formed. In addition, a communication hole is formed in the center of the four end sides of the raised material by a total of two notches at the corners of the two block materials. Further, at the four corners of the raised material, communication holes are formed only by the notches at the corners of each block material.

The communicating hole formed at each location can have various planar shapes such as rectangular (square or rectangular) and circular shape. In addition, the planar dimensions of each communicating hole may be different from each other, or the planar dimensions of the notch at each corner of each block material may be adjusted so that the planar dimensions of all communicating holes are the same. may be adjusted. Furthermore, the raising material may be formed by, for example, four blocks being arranged side by side to form a single raising material, and may include a plurality of layers. In this form, in addition to the corresponding notches in the adjacent block materials placed side by side communicating with each other horizontally, the corresponding notches in the block materials in the vertical relationship also communicate vertically with each other. A communicating hole is thus formed. In addition to the form in which all block materials have notches at each corner, there are also forms in which all block materials have notches in one to three corners, and block materials with notches. It may also be a form in which a block material without a notch is provided.

Another aspect of the building entrance structure according to the present invention is characterized in that the block material is made of foamed plastic.

According to this aspect, since the block material is made of foamed plastic, the weight of the entrance earthen floor can be reduced, and the entrance earthen floor can be provided with heat insulation properties. Furthermore, although foamed plastic is lightweight, it has a certain degree of rigidity. By reducing the weight of the entrance earthen floor, it is possible to reduce the scale of the footing for the foundation (for example, a cloth foundation) that is installed at a position corresponding to the outer wall of the building around the entrance earthen floor, further reducing the labor involved in constructing the foundation. It can be reduced. For example, even if blocks are placed immediately after pouring concrete for earthen floor concrete, since the blocks are made of lightweight foamed plastic, they will not be excessively hardened than the uncured earthen concrete. There is no risk of loading weight. Furthermore, since the surface finishing concrete is supported by the concrete bundle, the expansion ratio of the foamed plastic can be increased.

In another aspect of the entrance structure of a building according to the present invention, a concrete stopper surrounding the block material and the surface finishing concrete is provided at a position corresponding to the interior side of the entrance of the building that does not have the cloth foundation. It is erected,
The concrete stopper is characterized in that the concrete is prevented from flowing during construction of the surface finishing concrete.

According to this aspect, the concrete stopper is erected and left at a position corresponding to the inside of the entrance of a building that does not have a cloth foundation, thereby preventing the concrete from flowing during construction of the surface finishing concrete. can be achieved. Here, the concrete stopper is formed of, for example, a concrete block plate, a steel plate, a somewhat hard resin plate, or the like. The concrete stopper can be maintained in its upright position by fixing its lower end with a lower fastener and fastening its upper end or the vicinity of the upper end to a block material via an upper fastener.

Further, one aspect of the construction method for the entrance structure of a building according to the present invention is as follows:
A step of constructing a cloth foundation at a position corresponding to the outer wall of the building among the surroundings of the entrance dirt floor, and not constructing a cloth foundation at a position corresponding to the inside of the entrance room of the building;
Step B of constructing dirt floor concrete at the lower position of the entrance dirt floor;
Step C of installing a block material for raising the level on the concrete floor;
D step of pouring concrete for surface finishing concrete on the block material for raising the height,
In the C step, the block material is provided with a communication hole communicating with the dirt floor concrete from the lower surface in contact with the dirt floor concrete to its upper surface, and in the D step, the concrete for the surface finishing concrete is formed. A portion of the concrete flows into the communicating hole, hardens inside the communicating hole, and forms a concrete bundle that supports the surface finishing concrete.

According to this aspect, in step C, by installing the blocks for raising the level on the concrete of the entrance earthen floor, the shape of the blocks will not collapse, so the area around the entrance earthen floor can be surrounded with a foundation such as a cloth foundation. The amount of foundation construction can be reduced. Furthermore, this block material is provided with a communication hole extending from the lower surface in contact with the dirt floor concrete to the inside thereof and communicating with the dirt floor concrete, and in step D, a part of the concrete for surface finishing concrete flows into the communication hole, thereby forming a concrete bundle. By forming a concrete bundle, the surface finishing concrete can be supported by this concrete bundle. In other words, by supporting the surface finishing concrete with concrete bundles that are constructed at the same time as the surface finishing concrete is being constructed, it becomes unnecessary to support the weight of the surface finishing concrete with block materials, and the surface finishing concrete can be stably supported. It is possible to construct a doorway structure that can be used.

In another aspect of the method for constructing an entrance structure for a building according to the present invention, in the step D, the block material and the surface finishing The present invention is characterized in that a concrete stopper is erected to surround the concrete, and a dirt floor concrete swell prevention material is installed outside the legs of the concrete stopper.

According to this aspect, in step D, a concrete stopper is erected at a position corresponding to the inside of the entrance of a building that does not have a cloth foundation, thereby preventing the flow of concrete during construction of surface finishing concrete. be able to. Furthermore, by installing soil concrete swell prevention materials on the outside of the legs of the concrete stopper, for example, when blocks are installed while the soil concrete is uncured and surface finishing concrete is poured. The weight of the dirt floor concrete bulge prevention material can prevent the uncured dirt floor concrete from being pushed out to the side by the weight of the surface finishing concrete. Here, as the material for preventing the concrete from rising on the earthen floor, for example, plywood, plywood, control panel, etc. can be used.

As can be understood from the above explanation, according to the construction method of the entrance structure of a building of the present invention, it is possible to reduce the amount of foundation construction around the entrance earthen floor, and to stably support the surface finish concrete. Can be done.

FIG. 2 is a plan view of an example of a conventional entrance structure of a building, viewed from above a cloth foundation. FIG. 2 is a view taken along the line II-II in FIG. 1, and is a vertical cross-sectional view of an example of a conventional building entrance structure. FIG. 3 is a plan view of another example of the conventional entrance structure of a building, viewed from above the cloth foundation. FIG. 4 is a view taken along the line IV-IV in FIG. 3, and is a vertical cross-sectional view of another example of the conventional building entrance structure. It is a process diagram of an example of the construction method of the entrance structure of the building based on embodiment, Comprising: It is a top view seen from above the cloth foundation. 6 is a view taken along the line VI-VI in FIG. 5. FIG. Continuing from FIG. 5, it is a process diagram of an example of the construction method for the entrance structure of a building according to the embodiment, and is a plan view seen from above the cloth foundation. FIG. 8 is a view taken along the line VIII-VIII in FIG. 7; Continuing from FIG. 7, it is a process diagram of an example of the construction method for the entrance structure of a building according to the embodiment, and is a plan view seen from above the cloth foundation. FIG. 9 is a view taken along the line XX in FIG. 9; Continuing from FIG. 9, it is a process diagram of an example of the construction method of the entrance structure of the building according to the embodiment, and is a plan view seen from above the cloth foundation, and is an example of the entrance structure of the building according to the embodiment. FIG. FIG. 12 is a view taken along arrows XII-XII in FIG. 11;

Hereinafter, a building entrance structure and its construction method according to an embodiment will be described with reference to the attached drawings. Note that in this specification and the drawings, substantially the same constituent elements may be given the same reference numerals to omit redundant explanation.

[Entrance structure of building and its construction method according to embodiment]
An example of a construction method for a building entrance structure according to an embodiment and an example of a building entrance structure according to an embodiment constructed by this construction method will be described with reference to FIGS. 5 to 12. Here, FIG. 5, FIG. 7, FIG. 9, and FIG. 11 are process diagrams of an example of the construction method of the entrance structure of a building according to the embodiment, and are plan views seen from above the cloth foundation, FIG. 11 is a diagram further showing an example of a building entrance structure according to the embodiment. 6, FIG. 8, FIG. 10, and FIG. 12 are respectively a VI-VI arrow view in FIG. 5, an VIII-VIII arrow view in FIG. 7, an XX arrow view in FIG. 9, and FIG. It is a XII-XII arrow view. In the following description, a cloth foundation will be used as a foundation, but the foundation may be a solid foundation or the like other than a cloth foundation. Further, illustration of reinforcement inside the cloth foundation 20 and the concrete floor 30 is omitted.

The construction method of the entrance structure according to the embodiment is a construction method that allows the construction of the earthen floor concrete 30 that constitutes the entrance structure to the construction of the surface finish concrete 60 to be performed on the same day. Since both types of concrete are placed on the same day, the dirt floor concrete 30 is in an unhardened state at the stage of placing the concrete for the surface finishing concrete 60. Below, we will explain the construction method that made it possible to construct both types of concrete on the same day. In addition, the construction method of the entrance structure may be a construction method in which the construction date of the earthen floor concrete and the construction date of the surface finishing concrete are different. In this construction method, after the concrete for the earthen floor is placed, after a curing period of several days, for example, blocks are placed on the completely hardened concrete for the earthen floor, and surface finish concrete is placed.

First, as shown in FIGS. 5 and 6, a cloth foundation 20 is constructed around the entrance dirt floor 10 at a position corresponding to the outer wall of the building, and a cloth foundation 20 is constructed at a position 12 corresponding to the entrance room 15 side of the building. will not be constructed. Here, the cloth foundation 20 may be constructed on-site by arranging reinforcement and pouring concrete on-site, or by transporting a plurality of precast cloth foundations (divided bodies) to the site. The entire cloth foundation 20 may be formed by assembling the parts.

The cloth foundation 20 has a footing 21 and a rising portion 22, and the cloth foundation 20 is constructed on top of a crushed stone layer and a sacrificial concrete layer (none of which are shown) (step A).

After constructing the cloth foundation 20, backfill soil is backfilled to a predetermined height of the rising portion 22, and after the backfill soil is compacted, fresh concrete for the earthen floor concrete 30 is placed on the surface layer of the backfill soil. (Step B). Note that FIGS. 5 and 6 show the state before the fresh concrete for the dirt floor concrete 30 hardens. Here, the porch 25 leading to the entrance earthen floor 10 is constructed at an appropriate timing, such as after the A process or the B process, or after the C process described below.

Next, as shown in FIGS. 7 and 8, and then in FIGS. 9 and 10, before the fresh concrete for the earthen floor concrete 30 is completely hardened, a block material 40 for raising the level (in the illustrated example) is placed on top of the fresh concrete. A total of three layers of block material) will be installed one after another. At this time, a lower fastener 53 with a claw is interposed between the fresh concrete 30 and the block material 40. This lower fastener 53 is a fastener that fixes the lower end of the concrete stopper 50, which will be described below. In addition, the block material of the form which is a single layer block material which has the height of three layers of the illustrated example, and is provided with the several notch which extends from the lower surface to the upper surface may be applied.

The block materials 40 shown in FIGS. 7 to 10 are square blocks in plan view having a planar area equal to the quarter of the square entrance dirt floor 10 in plan view, and each block material 40 has four corner portions. is provided with a notch 41 that is rectangular in plan view. Note that the block material may be rectangular in plan view, and the cutout may be tapered (triangular) or quarter circular in plan view. Furthermore, not all of the block materials 40 may have notches at each corner (for example, there may be notches at one to three corners), or there may be notches at all corners. There may also be block materials that do not have.

Here, the block material 40 is preferably formed of foamed plastic. Foamed plastic is a material made by foaming raw synthetic resin at a predetermined expansion ratio. Raw synthetic resins include polyurethane (PUR), polystyrene (PS), and polyolefins (mainly polyethylene (PE) and polypropylene (PP)). ), phenolic resin (PF), polyvinyl chloride (PVC), urea resin (UF), silicone (SI), polyimide (PI), and melamine resin (MF). Polyurethane foam (sponge, foaming magnification is about 10 to 60 times), polystyrene foam, polyethylene foam (PE foam; PE includes low-density polyethylene, high-density polyethylene, linear polyethylene, ethylene-vinyl acetate copolymer (EVA) ) and ethylene-propylene copolymers). Further, the block material 40 can be molded by various molding methods, such as expanded polystyrene (EPS), expanded polystyrene sheet (PSP), and extruded polystyrene (XPS).

As shown in FIG. 7, when four block materials are placed side by side to form a raised material that is square in plan view, in the center of the raised material, there are A communication hole 43 is formed by the four notches 41 . Moreover, a communication hole 42 is formed in the center of the four end sides of the raised material by a total of two notches 41 at the corners of the two block materials 40. Further, at the four corners of the raised material, communication holes 41 are formed only by the notches 41 at the corners of each block material 40.

As shown in FIGS. 9 and 10, the raised material in the illustrated example is entirely constructed by laminating three layers of one layer of raised material each made of four blocks 40. In the formed raised material, each communication hole 41, 42, 43 extends from the uncured earthen floor concrete 30 to the upper surface of the uppermost block material 40.

Since the block material 40 is installed when the earthen floor concrete 30 is not yet hardened, air bubbles and laitance (including bleeding water) may occur on the surface layer of fresh concrete even after the block material 40 is installed. On the other hand, the three-layer raising material is equipped with communication holes 41, 42, and 43 extending from the uncured earthen floor concrete 30 to the top surface of the top layer block material 40, thereby communicating the air bubbles and laitance that occur. It can be accommodated in the holes 41, 42, and 43. As a result, even if the block material 40 is placed on the upper surface of the earthen floor concrete 30 while it is still unhardened, there will be a weak part between the hardened earthen floor concrete 30 and the lowermost block material 40. The formation of a certain laitance layer is suppressed.

Furthermore, since the block material 40 is made of foamed plastic, the weight of the entrance earthen floor 10 can be reduced, and the entrance earthen floor 10 can be provided with heat insulation properties. Furthermore, since the lightweight block material 40 is placed on the unhardened dirt floor concrete 30, the unhardened dirt floor concrete 30 is prevented from being pushed excessively by the weight of the block material 40.

As shown in FIGS. 9 and 10, after three layers of block material 40 (elevating material) are installed on the uncured earthen floor concrete 30, concrete is placed so as to surround the side surface of the block material 40 on the entrance room 15 side. A stopper 50 is set up. Here, the concrete stopper 50 is formed of, for example, a concrete panel, plywood, a concrete block board, a steel plate, a somewhat hard resin board, or the like.

The lower end of the concrete stopper 50 is fixed to the lower fastener 53, and the upper fastener 51, such as a round separator, is inserted through an opening (not shown) opened near the upper end, and the tip of the upper fastener 51 is inserted. The vertical position of the concrete stopper 50 is maintained by engaging the nails on the upper surface of the block material 40, inserting the wedge material 52 through the upper fastener 51, and fastening it to the back surface near the upper end of the concrete stopper 50. do. In addition, the lower fastener can be arranged in the horizontal direction and its claws are engaged with the block material 40 as shown in the example, or alternatively, the lower fastener can be arranged vertically and the lower end is connected to the dirt floor concrete. The lower end of the concrete stopper 50 may be fixed by embedding it in the concrete stopper 30 and engaging the nail near the upper end with the concrete stopper 50.

As shown in FIG. 10, there is a difference in height between the upper end of the rising part 22 of the cloth foundation 20 and the upper end of the concrete stopper 50, and the upper surface of the block material 40 of the top layer. The upper space S formed by the stopper material 50 and the block material 40 becomes a space for surface finishing concrete. By erecting the concrete stopper 50 at a position corresponding to the entrance room 15 side of a building that does not have a cloth foundation, it is possible to prevent the concrete from flowing during surface finishing concrete construction.

Further, on the outside of the legs of the concrete stopper 50, a dirt floor concrete bulge prevention material 55 is installed. In the post-process, when pouring the surface finishing concrete into the space S, since the earthen floor concrete 30 is still unhardened, the unhardened earthen floor concrete 30 will be lateralized by the weight of the surface finishing concrete at the time of pouring. There is a risk of being pushed out. Therefore, by disposing the dirt floor concrete bulge prevention material 55 on the outside of the leg part of the concrete stopper 50, it is possible to suppress the dirt floor concrete 30 from being pushed out to the side by the weight of the dirt floor concrete bulge prevention material 55. Here, as the soil concrete heave prevention material 55, for example, a plywood board, plywood, a control panel, etc. can be used.

In addition, after pouring the dirt floor concrete 30, a plurality of spacers (not shown) may be embedded inside the uncured dirt floor concrete 30, or a plurality of spacers may be installed before pouring the dirt floor concrete 30. (Concrete is placed on the earthen floor after the spacers are installed.) The block material 40 may be supported by a plurality of spacers. With this method as well, the weight of the placed surface finishing concrete is supported by the spacer via the block material 40, so the unhardened earth floor concrete 30 is crushed by the weight of the surface finishing concrete and pushed out to the side. (hereinafter referred to as step C).

Next, as shown in FIGS. 11 and 12, fresh concrete for surface finishing concrete 60 is poured into the rising part 22 of the cloth foundation 20 and the upper space S formed by the concrete stopper 50 and the block material 40. (Step D). In addition, when pouring fresh concrete for the surface finishing concrete 60, reinforcing bars may be accommodated inside the communication holes 41, 42, 43.

A portion of the fresh concrete for the surface finishing concrete 60 cast in the space S flows into the plurality of communication holes 41, 42, 43, and the insides of the communication holes 41, 42, 43 are filled with fresh concrete. Then, the entrance structure 100 is constructed by hardening the fresh concrete for the unhardened dirt floor concrete 30 and the surface finishing concrete 60, and the fresh concrete inside the communication holes 41, 42, and 43. Incidentally, when the surface finish concrete 60 has hardened to some extent, the upper fastener 51 and the lower fastener 53 are removed, and the concrete stopper 50 is also removed. Note that the upper fastener 51 may be left in place, or the concrete stopper 50 may be left in place.

During step D, the dirt floor concrete 30 in the lowest layer is still uncured (not completely hardened), but due to the weight of the dirt floor concrete swell prevention material 55 located outside the legs of the concrete stopper 50, The weight of the surface finishing concrete 60 prevents the dirt floor concrete 30 from being pushed out to the side.

In addition, air bubbles and laitance may occur on the surface of the uncured concrete 30, but the air bubbles and laitance that occur are contained in the communication holes 41, 42, and 43 until the surface finishing concrete is placed. can do. Furthermore, when fresh concrete for surface finishing concrete 60 flows into the communication holes 41, 42, 43, air bubbles, etc. inside the communication holes 41, 42, 43 are pushed out to the outside of the communication holes 41, 42, 43. . Therefore, even if the block material 40 is placed on the dirt floor concrete 30 at an unhardened stage, a laitance layer, which is a weak part in strength, is formed between the hardened dirt floor concrete 30 and the block material 40. is suppressed.

Moreover, a plurality of concrete bundles 65 are provided between the surface finishing concrete 60 and the dirt floor concrete 30, the surface finishing concrete 60 is supported by the plurality of concrete bundles 65, and the surface finishing concrete is applied to the dirt floor concrete 30 via the concrete bundles 65. By transmitting the weight of the finished concrete 60, it becomes unnecessary to support the weight of the finished concrete 60 by the lightweight block material 40, and the entrance structure 100 in which the finished concrete 60 is stably supported can be constructed.

Therefore, the amount of foundation construction can be reduced by reducing the amount of cloth foundation on the side of the entrance room 15, and the surface finish concrete 60 can be supported stably, and the surface finish concrete 65 is supported by the concrete bundle 65. The strength of the lightweight block material 40 may be low, so that the foaming magnification of the plastic foam from which it is formed can be increased. Furthermore, it is possible to place the earthen floor concrete and the surface finishing concrete on the same day without creating structural weaknesses due to the laitance layer, etc., thereby significantly shortening the construction period of the entrance structure 100. becomes possible.

It should be noted that other embodiments may be adopted in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be appropriately determined depending on the application form.

10: Entrance dirt floor 20: Fabric foundation 30: Earthen floor concrete (fresh concrete)
40: Block material 41: Notch (communication hole)
42, 43: Communication hole 50: Concrete stopper 51: Upper fastener 52: Wedge material 53: Lower fastener 55: Earth floor concrete heap prevention material 60: Surface finish concrete 65: Concrete bundle 100: Entrance structure (building entrance structure )

Claims (1)

A construction method for a building entrance structure,
A step of constructing a cloth foundation at a position corresponding to the outer wall of the building among the surroundings of the entrance dirt floor, and not constructing a cloth foundation at a position corresponding to the inside of the entrance room of the building;
Step B of constructing dirt floor concrete at the lower position of the entrance dirt floor;
Step C of installing a block material for raising the level on the concrete floor;
D step of pouring concrete for surface finishing concrete on the block material for raising the height,
In the C step, the block material is provided with a communication hole communicating with the dirt floor concrete from the lower surface in contact with the dirt floor concrete to its upper surface, and in the D step, the concrete for the surface finishing concrete is formed. A portion flows into the communication hole and hardens inside the communication hole to form a concrete bundle that supports the surface finishing concrete ,
In step D, a concrete stopper surrounding the block material and the surface finishing concrete is erected at a position corresponding to the inside of the entrance of the building that does not have the cloth foundation, and the legs of the concrete stopper are erected. A method of constructing an entrance structure for a building , which is characterized by installing a material to prevent concrete from building up on the outside of the building.

Images