JP2509395B2 - Structure of building foundation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a building foundation having an underground beam and a first floor slab.

[0002]

2. Description of the Related Art Conventionally, as a building foundation of this type, there is one as shown in FIGS. 6, 7 and 8 (FIG. 6 shows a view of the building foundation from above, and FIG. (A cross section taken along line VII-VII in FIG. 6 and FIG. 8 shows a cross section taken along line VIII-VIII in FIG. 6). As shown in FIG. 6, this building foundation portion has underground beams 101, 10 extending in the longitudinal direction of the outer periphery of the building.
2 and this underground girder 101,10 on each foundation 111,112
2 is provided with an underground beam 200 that vertically intersects with the above-mentioned underground beam 10.
Beams 104 and 105 are provided between 1 and 102 in parallel with them. As shown in FIGS. 7 and 8, the underground beams 101, 10
In No. 2, most of the beams are buried in the ground to have rigidity, and only a part of them are exposed on the ground 110.
This is because the first-floor slab 103 is regulated so as to have a constant height above the ground surface. The crossbeams 104 and 105 reinforce the first floor slab 103 and are entirely provided on the ground 110. And these underground beams 101, 102
The first floor slab 103 is provided on the cross beams 104 and 105.

First, the above-mentioned building foundation is constructed by the underground beams 101,
Preliminary foundation piles 113, 114 at the intersection of 102 and 200
Is laid in advance and is constructed as follows according to the construction procedure shown in FIG. First, as shown in FIGS. 7 and 8, excavation of the beam regions A, B and C where the underground beams 101, 102 and 200 and the foundation piles 111 and 112 are to be provided is performed (S101). Actually, both sides (ranges indicated by broken lines a, b, and c) of each beam area A, B, and C are also excavated obliquely to form flat grooves 201, 202, and 203 having tapered side surfaces. Next, gravel (crack chestnuts) 1 on the bottom of the grooves 201, 202, 203.
31,132,231 and the gravel 135 for the beam 104,105 is laid (S102), and the waste concrete 133,1
34 and 232 are placed (S103). Next, the beam area A,
Reinforcing bars 124, 125, 224, and 225 for underground beams are assembled to B and C (S104), and subsequently each reinforcing bar 124, 125, 224,
The formwork for underground beams is erected on both sides of 225 (S105).
Then, concrete is poured into the mold to form the underground beams 101, 102, 200 (S106). Foundation 1
Reinforcing bar assembly, formwork and concrete placing of 11,112 are performed at the same time as the construction of the underground beam. After standing for a certain period of time in this state to cure the poured concrete (S1
07), the formwork for the underground beam is removed (S108). After the grooves 201, 202, 203 formed in the beam regions A, B, C are backfilled (S109), the first floor slab and the formwork for the beam, and the reinforcing bars 126, 127, 128 are assembled (S110, S111). At this time, the reinforcing bars 126 for the first floor slab and the reinforcing bars 124, 125, 22 for the underground beams are provided above the underground beams 101, 102, 200.
4,225 is connected. Next, concrete is poured into the formwork, and the beam members 104 and 105 and the first floor slab 1
And 03 are simultaneously formed (S112). First floor slab 103
And underground beams 101, 102, 200 are reinforcing bars 126 and 12.
4,125,224,225 are connected. Finally, cure the poured concrete
(S113).

[0004]

However, in the conventional structure of the building foundation, as described above, the underground beam 1 is used.
01, 102, 200 and 1st floor slab 103 (and girder 1
No. 04, 105) are separately formed in separate steps, so there is a problem that the steps are complicated and the construction period is long. Further, the grooves 201, 202, 203 formed at the start of construction (S101) are replaced with the underground beams 101, 102, 2.
After the formation of 00, before the formation of the first floor slab 103, the entire area is backfilled (S109), which is considered to be a waste of time.
Further, the structure of the conventional building foundation is the underground beam 101,
The rigidity of 102, 200 tends to be insufficient, and there is a problem that the grooves 201, 202, 203 must be deeply formed to deeply bury the underground beams 101, 102, 200 in order to increase the rigidity.

Therefore, an object of the present invention is to construct a building foundation having an underground beam and a first-floor slab in a short period of time by a simple process, and to embed the underground beam by increasing the rigidity of the underground beam. The purpose is to provide a structure for the building foundation that can make the depth of the groove shallow.

[0006]

In order to achieve the above object, the structure of the building foundation according to claim 1 is an underground beam and an underground beam.
A structure of a building foundation having a floor slab, wherein the underground girder and the first floor slab are integrally formed by reinforced concrete, and the bottom surface is almost entirely in contact with the ground in the area sandwiched by the underground girder. It is characterized in that a hollow closed box having rigidity is provided in contact with the inner side surface of the underground beam and the lower surface of the first floor slab.

Further, the structure of the building foundation according to claim 2 is a structure of a building foundation having an underground beam and a first floor slab, and the underground beam and the first floor slab are integrally made of reinforced concrete. In the area that is formed and sandwiched by the underground beams,
A closed box having a hollow rigidity is provided, the bottom surface of which is almost entirely in contact with the ground, and which is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab. The closed box is provided above the closed box. It is characterized in that a door is provided to allow access to the inside of the body and the first floor of the building.

Further, the structure of the building foundation according to claim 3 is a structure of a building foundation having an underground beam and a first floor slab, wherein the underground beam and the first floor slab are integrally made of reinforced concrete. In the area that is formed and sandwiched by the underground beams,
A hollow sealing body is provided which is in contact with the inner side surface of the underground beam and the lower surface of the first-floor slab, and a door which allows access to the inside of the sealing body and the first floor of the building above the sealing body. Is provided.

[0009]

The structure of the building foundation of claim 1 can be constructed by the following construction procedure. First, in a site where a building is to be constructed, a beam region in which an underground beam is to be provided and a region sandwiched inside the beam region are excavated to form a flat groove including each of the above regions. Next, in the region sandwiched by the beam regions in the groove, a hollow closed box body having a height exceeding the depth of the groove is arranged with its bottom surface substantially in contact with the ground.
Next, a plate-shaped formwork that exceeds the height of the closed box body is erected on the groove bottom outside the beam area, and for the underground beam on the beam area and the closed box body, respectively. Assemble the reinforcing bar for the 1st floor slab. Next, concrete is poured into the mold to form an underground beam in a gap between the closed box and the mold by the poured concrete, and at the same time, a first floor slab is formed on the closed box. In this way, the underground beam and the first floor slab are simultaneously formed by one-time concrete placing, so that the construction process is simplified as compared with the conventional method. That is, the work of backfilling the region sandwiched between the beam regions and the work of installing or removing the formwork for the first floor slab or the girder inside the beam region are omitted. This reduces the construction period. Moreover, while the formwork is erected only on the outer periphery of the building, the above-mentioned underground beam and the reinforcing bar for the first floor slab are the work inside the building, so the carpenter who is in charge of the former and the latter No more crossing with the reinforcing bar in charge.
Therefore, the form erection and the reinforcing bar assembly can be advanced in parallel, and the construction period can be shortened. Further, in the step of pouring concrete into the mold, since the bottom surface of the closed box body is almost entirely in contact with the ground, buoyancy is not generated in the closed box body. Therefore, the anchor for the closed box can be omitted or simplified. Further, since this closed box body is a closed body, there is no concern that concrete will enter the inside thereof. Therefore,
Concrete placing work can be done smoothly in a short time. In addition, the groove formed at the start of construction is required to backfill only the portion on the outer side (outer periphery of the building) of the underground beam, and the labor of backfilling the portion on the inner side of the underground beam is omitted. As a result of these, the structure of the building foundation is constructed in a short period of time with a simple process. Further, in the structure of the building foundation, a hollow rigid closed box which is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab is disposed in the area surrounded by the underground beam. Therefore, the rigidity of the underground beam is enhanced by the rigidity of the closed box body. This makes it possible to shorten the length of the portion of the underground beam to be buried in the ground, and to make the depth of the groove formed at the start of construction shallow.

The structure of the building foundation of claim 2 is the structure of claim 1.
It can be constructed by the same procedure as the structure of the building foundation of. Therefore, like the first aspect, it is constructed in a short period of time with simple steps. Further, since the rigidity of the underground beam is enhanced by the rigidity of the closed box body, the length of the portion of the underground beam embedded in the ground can be shortened, and the depth of the groove formed at the start of construction is shallow. It becomes possible. Moreover, in the structure of the building foundation, a door is provided above the closed box to allow access to the inside of the closed box and the first floor of the building. It can be used for various purposes, such as an underfloor storage.

The structure of the building foundation of claim 3 can be constructed by the following construction procedure. First, in a site where a building is to be constructed, a beam region in which an underground beam is to be provided and a region sandwiched inside the beam region are excavated to form a flat groove including each of the above regions. Next, in the region sandwiched by the beam regions in the groove, a hollow hermetic body having a height exceeding the depth of the groove is installed and disposed on the ground. Next, a plate-shaped formwork that exceeds the height of the sealing body is erected on the groove bottom outside the beam area, and the beam area and the first floor are provided on the beam area and the sealing body, respectively. Assemble the rebar for the slab. Next, concrete is poured into the formwork, and an underground beam is formed in the gap between the sealing body and the formwork by the poured concrete, and at the same time, a first floor slab is formed on the sealing body. In this way, the underground beam and the first floor slab are simultaneously formed by one-time concrete placing, so that the construction process is simplified as compared with the conventional method. That is, the work of backfilling the region sandwiched between the beam regions and the work of installing or removing the formwork for the first floor slab or the girder inside the beam region are omitted. This reduces the construction period. Moreover, while the formwork is erected only on the outer periphery of the building, the above-mentioned underground beam and the reinforcing bar assembly for the first floor slab are the work inside the building, so the carpenter in charge of the former and the latter No more crossing with the reinforcing bar in charge. Therefore, the form erection and the reinforcing bar assembly can be advanced in parallel, and the construction period can be further shortened. Further, in the step of pouring the concrete into the mold, there is no concern that the concrete will enter the inside of the sealed body, so that the concrete placing work can be smoothly performed in a short time. In addition, the groove formed at the start of construction is required to backfill only the portion on the outer side (outer periphery of the building) of the underground beam, and the labor of backfilling the portion on the inner side of the underground beam is omitted. As a result of these, the structure of the building foundation is constructed in a short period of time with a simple process. In addition, in the structure of this building foundation, since a hollow sealing body that is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab is arranged in the area surrounded by the underground beam, The rigidity of the body beam increases the rigidity of the underground beam. This makes it possible to shorten the length of the portion of the underground beam to be buried in the ground, and to make the depth of the groove formed at the start of construction shallow. Moreover,
In the structure of the building foundation, a door is provided on the upper part of the above-mentioned hermetically sealed body so that the inside of the hermetically sealed body and the first floor of the building can be moved in and out. It can be used as a storage cabinet.

[0012]

EXAMPLES The structure of the building foundation of the present invention will be described in detail below with reference to examples.

FIG. 1 shows a sectional structure of a building foundation portion according to one embodiment. The building foundation includes underground beams 1 and 2 extending along the outer periphery of the building and perpendicular to the cross section, and a first floor slab 3 formed on the underground beams 1 and 2. Underground beams 1, 2
In order to have rigidity, the lower part is buried in the ground, and only the upper part is above the ground 9. In a region surrounded by the underground beams 1 and 2, three hollow box bodies 6, 7 and 8 each having a rectangular parallelepiped shape as a closed box body having rigidity are arranged separately from each other. The upper surface of each hollow box body 6, 7, 8 is the lower surface 3 of the first floor slab 3.
The outer side surfaces of the hollow box bodies 6 and 8 on both sides are in contact with b
It touches the inner side surface of 2. Also, each hollow box body 6, 7, 8
The lower surface of is almost entirely in contact with the ground at the bottom of the groove 10. Beams 4 and 5 are closely formed in the gaps between the hollow boxes 6, 7 and 8. The first floor slab 3, the underground beams 1, 2 and the small beams 4, 5 are integrally formed of reinforced concrete. In addition, the doors 21, 22, 23 that allow the inside and outside of the hollow boxes 6, 7, 8 and the building to enter and exit through the opening of the first floor slab 3 are provided above the hollow boxes 6, 7, 8. Is provided.

The above-mentioned building foundation is first constructed of foundation piles 13 and 1.
4 is placed, and is constructed as follows according to the construction procedure shown in FIG. First, as shown in FIG. 1, excavating the beam regions A and B in which the underground beams 1 and 2 are to be provided and the region between the beam regions A and B are excavated, and a flat groove including each of the above regions is excavated. 10 is formed (S1). The groove side surfaces outside the beam regions A and B (outer peripheral side of the building) are tapered as in the conventional case. Next, at the bottom of the groove 10, gravel (split chestnuts) 31 and 32 are laid in the beam regions A and B, and anchors 15 and 1 are provided in the region sandwiched between the beam regions A and B.
Set 6 and 17 (S2, S3). These anchors 1
5, 16 and 17 serve to fix the hollow box bodies 6, 7 and 8 to the bottom of the groove 10. Next, waste concretes 33 and 34 are placed in the beam areas A and B, respectively (S4). Then, in the area surrounded by the beam areas A and B, hollow box bodies 6, 7, and 8 having a height exceeding the depth of the groove 10 are arranged with their bottom surfaces substantially in contact with the ground. Yes (S5). Next, the beam area A,
At the bottom of the groove on the outside of B, a plate-shaped mold which exceeds the height of the hollow box bodies 6, 7, 8 is erected. In parallel with this, beam areas A and B
On the inner and hollow boxes 6, 7 and 8 respectively,
Assemble the reinforcing bar for the 1st floor slab. At the same time, hollow boxes 6 and 7,
Reinforcing rods are assembled in the gaps 7 and 8 (S6). At this time, the reinforcing bar work can be carried out on the hollow boxes 6, 7 and 8 and work efficiently. Next, concrete is poured into the formwork, and the underground beams 1 and 2 are formed in the gap between the hollow box bodies 6 and 8 and the formwork outside thereof by the poured concrete. First floor slab 3 is formed on 6, 7, and 8. At the same time, the small beams 4, 5 are formed in the gaps between the hollow box bodies 6, 7, 8 (S7).
At this time, the reinforcing bars of the foundations 11 and 12 and concrete are placed at the same time. After the poured concrete is cured (S8), the form is removed, and the groove 10 partially remaining outside the underground beams 1 and 2 is backfilled.

As described above, by arranging the hollow boxes 6, 7, 8 in the region sandwiched between the beam regions A, B, the underground beams 1, 2 and the first floor slab 3, and further the small beam 4, Since 5 is formed at the same time by one-time concrete pouring, the construction process can be simplified as compared with the conventional method. That is, the beam area A,
It is possible to omit the work of backfilling the region sandwiched between B and the work of installing and removing the formwork for the first floor slab 3, the joists 4 and 5 inside the beam regions A and B. Thereby, the construction period can be shortened. Moreover, while the work to erect the formwork is performed only on the outer periphery of the building, the underground beam and the reinforcing bar assembly for the first floor slab are performed inside the building, so the carpenter in charge of the former and the steel bar worker in charge of the latter are The intersection of will not occur. Therefore, the form erection and the reinforcing bar assembly can be advanced in parallel, and the construction period can be shortened. Further, since the hollow box bodies 6, 7 and 8 are closed bodies, there is no concern that concrete will enter the inside thereof, and the concrete placing work can be carried out smoothly in a short time. Actually, the construction period is 1
It can be shortened from 0 days to 2 weeks. In addition, the groove 10 formed at the start of construction (S1) needs to be filled only in the portion outside the underground beams 1 and 2 (outer periphery of the building), and is filled in the portion inside the underground beams 1 and 2. You can save the trouble. In this example, since the bottoms of the hollow boxes 6, 7, 8 are almost entirely in contact with the ground in the step of pouring concrete into the formwork, the hollow boxes 6, 7, 8 are Buoyancy does not occur. Therefore, the hollow box body 6, 7, 8
It is possible to reduce the number of the anchors 15, 16 and 17 for the above, or to omit the work for setting the anchor without providing the anchor in an extreme case.

In addition, the constructed building foundation is composed of underground beams 1,
The outer side surfaces of the hollow box bodies 6 and 8 are in contact with the inner side surface of 2, and the hollow box bodies 6, 7, and 8 are in contact with the lower surface 3b of the first floor slab 3. Therefore, the rigidity of the underground beams 1, 2 can be increased by the rigidity of the hollow boxes 6, 7, 8. Further, this makes it possible to shorten the length of the portion of the underground beams A and B to be buried in the ground, and to make the depth of the groove 10 formed at the start of construction shallow. In addition, since the closed hollow boxes 6, 7, and 8 are provided directly below the first-floor slab 3, an air layer can be formed under the first-floor, unlike the conventional case, thus improving the heat retention of the first-floor. Can be made.

Further, doors 21, 22 and 23 are provided on the upper parts of the hollow boxes 6, 7 and 8 to allow access to and from the interior of the hollow boxes 6, 7 and 8 and the first floor of the building. Therefore, the inside of the hollow box bodies 6, 7 and 8 can be used for various purposes.
For example, it can be used for an underfloor storage, a piping pit, an inspection pit, a water pit, a water tank, an equipment machine room, and the like.

In the above-mentioned example, the cubic hollow boxes 6, 7 and 8 are arranged as the closed box, but the present invention is not limited to this. As shown in FIG. 2, a cylindrical hollow tube 46, 47, 4 whose both end faces are hermetically sealed as a hermetically sealed body.
8 may be arranged with a gap therebetween. The hollow tube 4
6, 47 and 48 may be arranged so that the directions of the central axes are aligned as shown in the figure, or may be arranged so that the central axes are orthogonal to each other. Alternatively, they may be arranged diagonally. Also in this case, the hollow tubes 46, 47, 48 are provided above the hollow tubes 46, 47, 48.
Doors 21,22 that allow access to and from the interior and the first floor of the building
By providing 23, this hollow tube 46, 47, 4
8 The inside can be used for various purposes. For example,
It can be used for underfloor storage, piping pits, inspection pits, water pits, water storage tanks, equipment machine rooms, etc.

Further, instead of directly providing the hollow tubes 46, 47, 48 (or the hollow box bodies 6, 7, 8) at the bottom of the groove 10, as shown in FIG. 3, the hollow tubes 46, 47, 48 are provided. Under the slab 8
3 may be formed. In this case, the upper and lower slabs 3 and 83 can be connected to the underground beams 1 and 2 (it can be said that a hollow tube space is formed in one thick slab). It is possible to increase the rigidity of Nos. 2 and 2. The construction is performed by hollow tubes 46, 47, 48 (or hollow box body 6,
Prior to setting (7, 8) in the groove 10, all that is required is to add the reinforcing bar work for the lower slab 83.

In the above-mentioned three examples, between the hollow box bodies 6, 7 and 8 as the closed box body, and the hollow tube 46 and the hollow tube body as the closed body.
Although a gap is provided between 47 and 48, the present invention is not limited to this, and the hollow beams or hollow tubes may be brought into close contact with each other to omit the beams 4 and 5.

[0021]

As is apparent from the above, the structure of the building foundation according to claim 1 is the structure of the building foundation having the underground beam and the first floor slab. The slab is formed integrally with reinforced concrete, and the bottom surface is almost entirely in contact with the ground in the area sandwiched by the underground beams. Since a closed box body having is arranged,
The underground beam and the first floor slab can be simultaneously formed by one concrete placing. Therefore, the construction process can be simplified as compared with the related art. That is, it is possible to omit the work of backfilling the region sandwiched between the beam regions and the work of installing or removing the formwork for the first floor slab or the beam on the inside of the beam region. Thereby, the construction period can be shortened. Moreover, while the formwork is erected only on the outer periphery of the building, the above-mentioned underground beam and the reinforcing bar for the first floor slab are the work inside the building, so the carpenter who is in charge of the former and the latter No more crossing with the reinforcing bar in charge. Therefore, the formwork erection and the reinforcing bar assembly can be advanced in parallel, and the construction period can be further shortened. Further, in the step of pouring concrete into the mold, since the bottom surface of the closed box body is almost entirely in contact with the ground, buoyancy is not generated in the closed box body. Therefore, the anchor for the closed box can be omitted or a simple one can be used. Also,
Since the closed box is a closed body, there is no concern that concrete will enter the inside. Therefore, the concrete pouring work can be smoothly performed in a short time. In addition, the groove formed at the start of construction is required to backfill only the portion on the outer side (outer periphery of the building) of the underground beam, and the labor for backfilling the portion on the inner side of the underground beam can be omitted. In this way, the structure of the building foundation can be constructed in a short time by a simple process. Further, in the structure of the building foundation, a hollow rigid closed box which is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab is disposed in the area surrounded by the underground beam. Therefore, the rigidity of the underground beam can be increased by the rigidity of the closed box body. As a result, the length of the portion of the underground beam embedded in the ground can be shortened, and the depth of the groove formed at the start of construction can be made shallow.

The structure of the building foundation of claim 2 is the structure of claim 1.
Similar to, it can be built in a short time with simple steps. Also, since the rigidity of the underground beam can be increased by the rigidity of the closed box, the length of the portion of the underground beam embedded in the ground can be shortened, and the depth of the groove formed at the start of construction can be reduced. Can be shallow. Moreover, at the top of the sealed box,
Since a door is provided to allow access to and from the inside of the closed box and the first floor of the building, the inside of the closed box can be used for various purposes such as an underfloor storage.

Further, the structure of the building foundation according to claim 3 is a structure of a building foundation having an underground beam and a first floor slab, and the underground beam and the first floor slab are integrally made of reinforced concrete. In the area that is formed and sandwiched by the underground beams,
Since the hollow hermetic body that is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab is provided, the underground beam and the first floor slab can be simultaneously formed by one-time concrete pouring. Therefore, the construction process can be simplified as compared with the related art. That is, it is possible to omit the work of backfilling the region sandwiched between the beam regions and the work of installing or removing the formwork for the first floor slab or the beam on the inside of the beam region. Thereby, the construction period can be shortened. Moreover, while the formwork is erected only on the outer periphery of the building, the above-mentioned underground beam and the reinforcing bar for the first floor slab are the work inside the building, so the carpenter who is in charge of the former and the latter No more crossing with the reinforcing bar in charge. Therefore, the formwork erection and the reinforcing bar assembly can be advanced in parallel, and the construction period can be further shortened. Further, in the step of pouring the concrete into the mold, there is no concern that the concrete will enter the inside of the closed body, so that the concrete placing work can be smoothly performed in a short time. In addition, the groove formed at the start of construction is required to backfill only the portion on the outer side (outer periphery of the building) of the underground beam, and the labor for backfilling the portion on the inner side of the underground beam can be omitted. In this way, the structure of the building foundation can be constructed in a short time by a simple process. Further, in the structure of the building foundation, since a hollow hermetic body that is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab is arranged in the area surrounded by the underground beam, The rigidity of the body beam can increase the rigidity of the underground beam. As a result, the length of the portion of the underground beam embedded in the ground can be shortened, and the depth of the groove formed at the start of construction can be made shallow. Moreover, in the structure of the building foundation, since a door is provided on the upper part of the sealed body to allow entry and exit of the sealed body and the first floor of the building, the sealed body has various uses, For example, it can be used as an underfloor storage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a building foundation portion according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a building foundation portion according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a structure of a building foundation portion according to still another embodiment of the present invention.

FIG. 4 is a process diagram for explaining a method of constructing a building foundation according to the present invention.

FIG. 5 is a process diagram illustrating a conventional method of constructing a building foundation.

FIG. 6 is a plan view showing a structure of a conventional building foundation.

7 is a view showing a cross section taken along the line VII-VII in FIG.

8 is a view showing a cross section taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 1,2 Underground beam 3 1st floor slab 4,5 Small beam 6,7,8 Hollow box 9 Ground 10 Groove 11,12 Foundation 13,14 Foundation pile 15,16,17 Anchor 21,22,23 Door 24, 25 Reinforcing bars for underground beams 26 Reinforcing bars for first floor slabs 27,28 Reinforcing bars for small beams 31,32 Gravel floor 33,34 Waste concrete 46,47,48 Hollow pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-47-15908 (JP, A) JP-A-60-43529 (JP, A)

Claims (3)

(57) [Claims] 1. A structure of a building foundation having an underground beam and a first floor slab, wherein the underground beam and the first floor slab are integrally formed by reinforced concrete, and are formed in an area between the underground beams. The bottom of the building has a hollow rigid box which is almost entirely in contact with the ground and is in contact with the inner side surface of the underground beam and the lower surface of the first floor slab. Construction. 2. A structure of a building foundation having an underground beam and a first floor slab, wherein the underground beam and the first floor slab are integrally formed by reinforced concrete, and are formed in an area sandwiched between the underground beams. , A bottom surface is almost entirely in contact with the ground, and an inner side surface of the underground beam and a lower surface of the first floor slab are provided with a hollow rigid closed box body, and the closed box body is provided above the closed box body. A structure of a building foundation, characterized in that a door is provided to allow access to the inside of the box and the first floor of the building. 3. A structure of a building foundation having an underground girder and a first floor slab, wherein the underground girder and the first floor slab are integrally formed by reinforced concrete and are located in a region sandwiched by the underground girder. , A hollow hermetic body that is in contact with the inner side surface of the underground beam and the lower surface of the first-floor slab is provided, and allows the inside of the hermetic body and the first floor of the building to enter and exit above the hermetic body. The structure of the building foundation, which is characterized by having a door.