JP3070991U - Grid type rectangular solid foundation structure - Google Patents

Abstract

(57) [Abstract] [Problem] In soft ground, etc., foundation reinforcement work (pile work, surface layer improvement work, column improvement work) is originally required, and for this reason a great deal of cost, material and labor is required for foundation work. (Man-hours) are required. SOLUTION: This is a foundation structure of a building on soft ground, in which a foundation for supporting the building is constructed in a girder type rectangular shape, and slab reinforcement is provided on the girder part vertically and horizontally and an underground beam is arranged to concrete. The girder-type rectangular solid foundation is constructed by casting and forming a girder-type rectangular solid foundation, and the foundation is constructed such that the center of gravity of the well-girder rectangular solid foundation substantially coincides with the total center of gravity of the building. .

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a girder-type rectangular solid foundation structure for reducing reinforcement work in soft ground (in the specification of the present application, refers to ground having a ground strength of less than 3 t / m2, including embankment).

[0002]

[Problems to be solved by the prior art and the invention]

 Detached houses are constructed using a variety of materials and construction methods, but most of the wooden frame construction methods (conventional construction methods) are supplied by small and medium-sized construction companies, and recently the housing by the two-by-four construction method has spread. Large companies have emerged.

[0003] Under these circumstances, the defective housing problem has recently been highlighted as a social problem. This is because many of the houses collapsed due to the earthquake were found to be more defective than the effects of the earthquake itself.

By the way, in Japan, soft ground areas with a ground bearing capacity of less than 3 t / m 2 are widely distributed, and many such 1- to 3-storey wooden buildings are built on such land. In this case, the eccentric load of the building caused by the difference in the center of gravity between the foundation and the building causes uneven settlement of the ground, which causes the building to tilt and the building to be damaged has been reported as a problem. . In addition to the area where soft ground is distributed, such deformation may occur in the newly constructed land that has just been embanked.

[0005] In such soft ground, etc., foundation reinforcement work (pile construction, surface layer construction work, columnar construction work) is originally required. Therefore, a great deal of cost, material, labor (man-hours) is required for foundation work. Etc. are required.

An object of the present invention is to provide a low-cost, girder-type rectangular solid foundation structure that does not require such reinforcement work even on soft ground and does not cause deformation.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the invention of the present application is a foundation structure of a building on soft ground, where a foundation for supporting the building is constructed in a cross-girder rectangular shape, and slab reinforcement is provided on the cross-girder part vertically and horizontally. A girder-shaped rectangular solid foundation is formed by arranging underground beams and placing concrete, and the foundation is constructed so that the center of gravity of the girder-shaped rectangular solid foundation almost matches the center of gravity of the building. This is a well-girder-type rectangular solid foundation structure.

[0008] According to this, since the load of the building is evenly supported by the entire foundation, even on soft ground having a ground bearing capacity of less than 3 t / m2, reinforcement of the foundation (pile construction, surface layer improvement work, columnar improvement work, etc.) ) Does not cause uneven settlement of the ground, and secures the integrity of the house. This will solve the problem of defective housing and guarantee housing performance in response to the enforcement of the Housing Quality Assurance Promotion Law.

[0009]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view illustrating a girder-type rectangular solid foundation 1 of the present invention. FIGS. 1 (a) and 1 (b) show a case where one cross-girder portion 2 is rectangular and a square, respectively. Show. FIG. 2 is a cross-sectional view of a main part of the girder type rectangular solid foundation 1 including the underground beam 5 and the slab reinforcement 6.

In FIGS. 1 (a) and 1 (b), the entire outer periphery 1a is rectangular when viewed as a whole, but is not limited thereto and may be square. For example, in (b), one row of girders may be eliminated to make the whole square.

[0012] In this manner, several cross-girder portions 2 of the same size are gathered to form one rectangular solid foundation.

The length of one side of each girder part 2 is 3 to 5 m, and the size of the girder part 2 is appropriately determined so that the center of gravity (center of gravity) of the entire solid foundation coincides with the total center of gravity of the building. You.

As shown in the cross-sectional view of the main part of FIG. 2, a rock stone 3 is laid in the ground at the bottom of the foundation in a wavy cross section. (If agricultural construction is not carried out, agricultural vinyl will be laid.) The reason for constructing discarded concrete 4 etc. in this way is that the contact of ready-mixed concrete that occurs at the time of concrete placement may cause a dehydration phenomenon of water, making it impossible to secure the water-cement ratio, and the required concrete strength may be reduced. This is because they may not be obtained.

[0015] Under the outer periphery 1a of the foundation is a valley portion of the chestnut stone 3, in which an underground beam 5 is constructed and formed, and another underground beam 5 having a certain span (usually 3 to 5 m) is formed. Is formed in the valley of Kuriishi 3. The reinforcement structure of the underground beam 5 includes a pair of upper reinforcements 5a arranged at each corner of the rectangle and a pair of lower reinforcements 5b disposed below the reinforcement, and a star connecting these longitudinally. It is constituted by a wrap (stirrup) 5c.

FIGS. 3A and 3B show two examples of slab arrangement guides. In each case, slab reinforcing bars 6 are constructed vertically and horizontally (in (a), in square shape in (b)) so as to connect the top reinforcement 5a of the underground beam 5, and in two steps up and down. The slab arrangement shown in FIG. 2 is an example of double arrangement of upper and lower stages, but may be a single arrangement arranged only at the upper end arrangement. Note that the oblique streaks 6a are arranged so as to connect the lower end struts 5b of the underground beams 5 diagonally from the lower slab reinforcing bars 6 toward the valleys.

A stirrup 7 extending upward from the underground beam 5 and rebars 8 are arranged vertically so as to adhere to the stirrup 7 and extend horizontally in the outer periphery 1 a of the foundation. The upper strut, the lower strut, the underground beam, and the slab arrangement are used as strength bones, and concrete 9 is cast on the strength struts to form a girder-type rectangular solid foundation.

FIG. 4A shows a planar outline of the building, and G shows the position of the total center of gravity of the building. On the other hand, FIG. 4 (b) shows the plane of the grid-type rectangular solid foundation, and Gf indicates the position of the center of gravity (center of gravity) of the grid-type rectangular solid foundation. When constructing a one- to three-story building on a girder-shaped rectangular solid foundation constructed as described above, the position of the total center of gravity of the building is calculated in advance, and the girder-shaped rectangular solid is added to the position of the center of gravity. The size and shape of the rectangle of the girder-shaped rectangular solid foundation are determined so that the center of gravity of the foundation matches.

For example, the position of the total center of gravity of a three-story building is obtained as follows. Floor area 1st floor: A1, 2nd floor: A2, 3rd floor: A3 x-direction center of gravity position 1st floor: Gx1 2nd floor: Gx2, 3rd floor: Gx3 y-center of gravity position 1st floor: Gy1 2nd floor: Gy2, 3rd floor : Gy3 Total gravity center position in the x direction GX = (A1 × Gx1 + A2 × Gx2 + A3 × Gx3) / (A1 + A2 + A3) Total gravity center position in the x direction GY = (A1 × Gy1 + A2 × Gy2 + A3 × Gy3) / (A1 + A2 + A3)

[0021] By making the center of gravity of the girder-type rectangular solid foundation substantially coincide with the total center of gravity of the building, the load of the building is evenly distributed over the entire foundation, thereby preventing uneven settlement of the ground ( It does not generate defective houses. If there is a difference of 60 cm or more between the outer periphery of the girder-type rectangular solid foundation and the outer wall of the building, it is necessary to consider the jump due to the unloaded upper load and the first floor load.

[0021]

[Effect of the invention]

 The invention of the present application is implemented in the form described above, and has the following effects.

[0022] Since the load of the building is evenly supported by the entire foundation, even if the ground is less than 3 t / m2, even if the ground is weak, the foundation can not be reinforced (pile work, surface improvement work, pillar improvement work). The land can be maintained without uneven settlement, and the house can be maintained. Therefore, it is possible to prevent the occurrence of defective housing and to guarantee the performance of housing in response to the enforcement of the Act on the Promotion of the Quality Assurance of Housing.

[Brief description of the drawings]

FIG. 1 is a plan view of a girder-type rectangular solid base structure 1 of the present invention, wherein (a) and (b) show a case where one cross-girder portion 2 is rectangular and a square, respectively.

FIG. 2 is a cross-sectional view of a main part of a girder type rectangular solid foundation including slab reinforcement and underground beams.

FIGS. 3A and 3B show two examples of slab arrangement diagrams.

4A is a diagram illustrating a center of gravity position of a building, and FIG. 4B is a diagram illustrating a center of gravity position of a solid foundation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... (Girder type rectangular) Solid foundation 2 ... Girder part 3 ... Kuriishi 4 ... Discarded concrete 5 ... Underground beam 5a ... Top reinforcement 5b ... Bottom reinforcement 6 ... Slab reinforcement 7 ... Stirrup (stirrup) 8 ... Rebar 9 …concrete

Claims (1)

[Utility model registration claims] 1. A foundation structure of a building on soft ground, wherein a foundation for supporting the building is constructed in a cross-girder rectangular shape, and the cross-girder portion is slab-arranged vertically and horizontally, and an underground beam is arranged. A girder-type rectangular solid foundation is formed, and the foundation is constructed such that the center of gravity of the girder-type rectangular solid foundation substantially coincides with the total center of gravity of the building. Rectangular solid foundation structure.