JP2017115499A - Lower pit structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable effective utilization of an in-pit space, and efficiently bear building stress.SOLUTION: In a lower pit structure of a building, an in-pit space is formed between a foundation slab of a mat foundation and a floor slab of a lowermost layer of an upper building part. A connecting short support, which is located in a position except a lower position of a column of the upper building part to connect the foundation slab and the floor slab together in such a manner as to enable stress transfer, is arranged in the in-pit space.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lower pit structure of a building in which a pit space is formed.

  In the above-mentioned lower pit structure, a space in the pit is formed between the foundation slab of the solid foundation and the floor slab in the lowermost layer of the upper building, and the space in the pit is used to install various equipment, underfloor piping, wiring, etc. It is used as a space.

  In the lower pit structure, as an upright part of the solid foundation, the outer foundation side beam arranged on the outer circumference side in plan view, and the inner foundation beam arranged between the column bases of the upper building part in the pit space A structure provided with is known. However, in this structure, since the internal foundation beam is located in the space inside the pit, a through hole must be formed in the internal foundation beam in order to perform underfloor piping and wiring. It is difficult to secure a large space as an installation space.

  Therefore, conventionally, a connecting member that connects the column base and the foundation slab is provided in the space in the pit for each column of the upper building, and stress is transmitted from the column to the foundation slab via the connection member. The structure which eliminated the internal foundation beam is proposed (for example, refer patent document 1).

JP-A-2005-155093

  However, in the above-mentioned Patent Document 1, the internal foundation beam bearing the bending stress and shear stress is omitted, and the stress of the building is transmitted from the column to the foundation slab by the joining member. Higher ones are required, leading to an increase in size and complexity of the foundation structure.

  In view of this situation, a main problem of the present invention is to provide a lower pit structure of a building that can effectively use the space in the pit and can efficiently bear the stress of the building.

The first characteristic configuration of the present invention is a lower pit structure of a building in which a space in the pit is formed between a solid foundation slab and a lowermost floor slab of the upper building part.
In the space in the pit, a connecting column for connecting the foundation slab and the floor slab so as to be able to transmit stress is arranged in a non-columnar part other than the columnar part of the upper building part. is there.

  According to this structure, since the connecting bundling column connects the foundation slab and the floor slab so as to transmit stress, stress can be applied not only to the foundation slab but also to the floor slab. Therefore, the stress load on the foundation slab side can be reduced, the foundation structure can be simplified, and the inner foundation beam can be omitted as the foundation structure while ensuring a desired proof stress. By omitting the internal foundation beam, a large space can be secured in the space in the pit, and the space can be effectively used as an installation space for various equipment, underfloor piping and wiring. Also, it is possible to flexibly respond to the change of the position of the underfloor piping and the change of the wiring position due to the change of the position of the water without using the work such as forming a through hole by effectively utilizing the space in the pit. Can do.

  According to a second characteristic configuration of the present invention, the foundation slab and the floor slab include an outer foundation side beam provided on the outer circumference side of the foundation slab, the connecting bundle column, and the under-column part of the foundation slab. Are connected and integrated so as to be able to transmit stress at each of the upper parts of the foundations under the pillars.

  According to this configuration, the foundation slab and the floor slab are connected to each other so that stress can be transmitted through the outer foundation side beam, the connecting column and the upper part of the foundation under the pillar. Can increase the sex. Therefore, it is possible to provide a rational foundation structure that can appropriately share stress between the foundation slab and the floor slab.

  A third characteristic configuration of the present invention is that the plurality of connecting bundle columns are configured to have a lower strength than the column base upright and are arranged at a pitch narrower than the column span.

  According to this configuration, the connecting bundling column can have a simple structure having a lower strength than that of the under-column foundation stand. By making the pitch of the connecting bundle columns narrower than the column span, it is possible to effectively connect the foundation slab and the floor slab while appropriately supporting the floor slab by the connecting columns having a simple structure.

Plan view showing the lower pit structure in the entire building Fig. 1 is an enlarged plan view partially enlarged. III-III longitudinal sectional view in FIG. 1 is a longitudinal sectional view of IV-IV in FIG. Longitudinal sectional view showing the joint structure of foundation slab, connecting column and floor slab

An embodiment of a lower pit structure of a building according to the present invention will be described with reference to the drawings.
For example, as shown in FIG. 1, the building having the lower pit structure is formed in a rectangular shape in plan view, but the shape can be appropriately changed. As shown in FIGS. 3 and 4, the lower pit structure includes an upper building part 2 provided with a pillar 1 and a solid foundation 3 that supports the upper building part 2, and a foundation slab 4 and an upper part of the solid foundation 3 A space 6 in the pit is formed between the floor slab 5 of the lowermost layer of the building part 2.

  The foundation slab 4 is composed of a pressure plate made of concrete, for example. As shown in FIG. 1 and FIG. 4, as the upright portion of the solid foundation 3, a concrete outer peripheral side beam 7 is arranged on the outer peripheral side of the foundation slab 4 over the entire periphery.

  As shown in FIGS. 1 to 3, a plurality of under-post foundation standing portions 8 are arranged in the pit space 6. The upper building part 2 is provided with the pillars 1 with a predetermined pillar span, and the pit space 6 is provided with a lower part 4a corresponding to the position of the pillars 1 in plan view (see FIGS. 1 and 2). The under-column foundation uprights 8 are disposed in each of these, and the under-column foundation uprights 8 are also disposed on the outer peripheral side.

  As shown in FIGS. 1, 2, and 4, a plurality of bundling columns 9 for connection are arranged in the pit space 6 in addition to the under-post foundation standing portion 8. This connecting column 9 is usually connected to a first non-columnar portion 4b (a position indicated by a dotted line in FIG. 1 and FIG. 2) between the columnar portion 4a and the columnar portion 4a where the foundation beam is disposed. Reference). A plurality of connecting bundle pillars 9 are arranged at intervals in the first non-pillar lower portion 4b. As described above, the column foundation foundation 8 is arranged with the column span of the upper building part 2, and the connecting bundle columns 9 are narrower than the column span of the upper building part 2 (pitch of the column foundation foundation 8). Arrange at the pitch.

  In this embodiment, as shown in FIGS. 1 and 2, not only the first non-columnar part 4b corresponding to the space between the columnar part 4a and the columnar part 4a, but also other second non-columnar parts 4c. Also, the connecting bundle pillars 9 are arranged. Similarly to the first non-columnar site 2b, the connecting bundle columns 9 of the second non-columnar site 4c are also arranged at a pitch narrower than the column span of the upper building part 2 (pitch of the columnar foundation upper part 8). . As a result, in the first non-columnar site 4b and the second non-columnar site 4c, which are non-columnar sites other than the columnar site 4a, the connecting bundle columns 9 are dispersedly arranged in a plurality of rows.

  As shown in FIG. 3, the column foundation foundation 8 is made of concrete that joins the foundation slab 4 and the floor slab 5, and connects the foundation slab 4 and the floor slab 5 so as to transmit stress. As shown in FIGS. 3 and 4, the connecting bundle pillar 9 is made of concrete such as precast concrete that joins the foundation slab 4 and the floor slab 5, and can transmit stress between the foundation slab 4 and the floor slab 5. Connected to.

  As shown in FIG. 2, for example, the cross-sectional shape of the under-column foundation standing portion 8 and the connecting bundle column 9 is rectangular, and the connecting bundle column 9 has a cross-sectional area larger than that of the under-column foundation standing portion 8. Form small. As a result, the connecting bundle pillar 9 is configured to have a lower strength than the under-base foundation standing portion 8, thereby simplifying the structure of the connecting bundle pillar 9.

  By arranging a plurality of connecting columns 9 for connection, stress can be borne not only on the foundation slab 4 but also on the floor slab 5, while omitting internal foundation beams across the column bases of the upper building part 2, Can be supported efficiently. Therefore, it is possible to obtain a foundation structure that can appropriately bear bending stress and shear stress while reducing the stress burden on the foundation slab 4 side. Moreover, in the pit space 6, a large space can be secured by omitting the internal foundation beam, and the space can be effectively used as an installation space for various equipment, underfloor piping and wiring. In addition, it is possible to flexibly respond to the change of the position of the underfloor piping and the change of the wiring due to the change of the position of the water without using the work in the pit space 6 and forming a through hole. .

The joining of the basic slab 4 and the floor slab 5 will be described.
As shown in FIG. 5, in each of the plurality of connecting bundle columns 9, reinforcing bars 10 are arranged across the foundation slab 4, the connecting bundle columns 9, and the floor slab 5 in the vertical direction. Joins the foundation slab 4 and the floor slab 5. Incidentally, in FIG. 5, 11 is a reinforcing bar arranged on the basic slab 4, and 12 is a reinforcing bar arranged on the floor slab 5. Reinforcing bars 11 on the side of the foundation slab 4 are arranged by narrowing the interval between the lower reinforcing bars 11 at the joint site with the connecting bundle pillars 9, and the reinforcing bars 12 on the floor slab 5 side are arranged on the connecting bundle pillars. 9 is arranged with the space between the upper reinforcing bars 12 being narrowed at the joint portion.

  Although illustration is omitted, also in the outer peripheral side beam 7, similarly to the connecting bundle column 9, reinforcing bars are arranged across the basic slab 4, the outer peripheral side beam 7 and the floor slab 5 in the vertical direction, The outer peripheral side foundation beam 7 joins the foundation slab 4 and the floor slab 5. In addition, in the under-column foundation upright 8, reinforcing bars are arranged in the vertical direction across the foundation slab 4, the under-column foundation upright 8, and the floor slab 5. The floor slab 5 is joined.

  The foundation slab 4 and the floor slab 5 are joined to each other at the outer foundation foundation slab 4 by connecting the foundation slab 4 and the floor slab 5 at each of the outer foundation foundation beam 7, the connecting bundle pillar 9, and the lower foundation upright 8. The beam 7, the connecting bundle column 9, and the bottom base upright portion 8 are connected and integrated so as to transmit stress. By this integration, the structural integrity of the foundation slab 4 and the floor slab 5 can be enhanced, and a rational foundation structure that can bear stress not only by the foundation slab 4 but also by the floor slab 5 is constructed. . Further, by increasing the structural integrity of the foundation slab 4 and the floor slab 5, the foundation structure itself can also improve the overall rigidity.

[Another embodiment]
(1) In the above-described embodiment, the arrangement positions of the connecting bundle pillars 9 are the first non-columnar part 4b and the second non-columnar part 4c. For example, only the first non-columnar part 4b is for connection. A bundle pillar 9 can also be arranged.

(2) In the above embodiment, the connecting bundle pillars 9 are configured to have a lower cross-sectional area than the under-column foundation uprights 8 and to have a lower strength than the under-column foundation uprights 8. Instead of this, for example, by adopting the material strength of the concrete that is lower in the connecting bunch column 9 than the under-column foundation upright 8, the connecting bundling column 9 than in the under-column foundation upright 8. Can also be configured with low strength. At this time, by making the cross-sectional area of the connecting bundle pillar 9 and the under-base foundation upright 8 the same or substantially the same, when manufacturing the concrete connecting bundle pillar 9 and the under-column foundation upright 8 Can be used as a mold.

  Further, the connecting bundle pillar 9 can be configured to have a lower strength than the under-column foundation upright portion 8 by other methods than the cross-sectional area and the material strength of the concrete.

(3) In the above-described embodiment, the foundation slab 4 and the floor slab 5 are connected and integrated so as to be able to transmit stress at each of the outer peripheral side foundation beam 7, the connecting bundle column 9, and the column base foundation upper portion 8. . Alternatively, the foundation slab 4 and the floor slab 5 can be integrated by connecting the outer side foundation beam 7 and the connecting bundle column 9 so that stress can be transmitted. It is also possible to connect and integrate the foundation upright portion 8 so that stress can be transmitted.

DESCRIPTION OF SYMBOLS 1 Column 2 Upper building part 3 Solid foundation 4 Foundation slab 4a Lower column part 4b First non-column lower part 4c Second non-column lower part 5 Floor slab 6 Space in pit 7 Outer foundation foundation beam 8 Lower column foundation upper part 9 Connection Bunch pillar

Claims (3)

A lower pit structure of a building in which a space in the pit is formed between a foundation slab of a solid foundation and a floor slab of the lowermost layer of the upper building part,
In the space in the pit, there is a connecting column that is connected to the base slab and the floor slab so as to be able to transmit stress in a non-columnar part other than the columnar part of the upper building part. Lower pit structure.   The foundation slab and the floor slab are an outer foundation side beam provided on the outer circumference side of the foundation slab, the connecting bundle column, and a column foundation foundation upright provided in the lower part of the foundation slab. The lower pit structure of a building according to claim 1, wherein the two are integrated so as to be capable of transmitting stress.   3. The lower pit structure of a building according to claim 1, wherein a number of the connecting column pillars are configured to have a lower strength than the base upright portion under the pillar and are arranged at a pitch narrower than a column span.

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