JPH0743177Y2 - Mounting structure of concrete cloth foundation and precast concrete wall slab - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention (1) Field of Industrial Application This invention relates to a concrete cloth foundation for small and medium-scale buildings, and more particularly to a mounting structure for a concrete cloth foundation and a precast concrete wallboard.

(2) Conventional Technology As shown in FIG. 6, a conventional cast-in-place concrete foundation for small and medium-sized buildings has a convex cross section and is continuously formed in the horizontal longitudinal direction. That is, in the figure,
a is a wide bottom plate fixed to the foundation ground, b is a narrow standing wall part rising from the center of the bottom plate a, and the core part is constituted by these, and the distribution reinforcing bar c is attached to the core part.
Are arranged. By making such a cross section convex, a structure advantageous in terms of stress is realized.

However, on the other hand, the shape is complicated, and the efficiency of concrete driving is deteriorated. That is, the bottom part a
Assemble the formwork of, pour concrete into the formwork,
After that, it is a two-step construction in which the concrete of the standing wall portion b is assembled with the solidification of the concrete and the concrete is placed, which requires time and labor for the construction.

In the prefabricated building, the precast concrete wall slab d is placed on the standing wall b through the height-adjusting cement e, but the connection between the standing wall b of the cloth foundation and the concrete wall slab d is on the standing wall b. No particular consideration is given to anything other than the implanted anchor bolts f, and there is a problem with the strength of this joint. Furthermore, if only the height adjusting cement e is used, the water blocking ability between the outside and the inside of the building is insufficient, and deterioration of the foundation due to intrusion of rainwater from this portion also poses a problem.

(3) Problems to be Solved by the Invention The present invention has been made in view of the above circumstances, and provides a precast base material that enables easy construction and construction of a cloth foundation, and also provides the precast base material and the precast base material. It is an object of the present invention to provide a mounting structure that is excellent in strength and water blocking property in connection with a concrete wall slab placed on a floor.

B. Configuration of the Invention (1) Means for Solving Problems The mounting structure of the concrete cloth foundation and the precast concrete wall slab of the present invention has the following configurations to achieve the above object.

That is, there is a skeleton part having a U-shaped cross section, which is composed of side walls facing each other and having a groove part, and a bottom plate connecting the bottom parts of the side walls. A precast base material in which both end portions of the skeleton portion are exposed with a distribution reinforcing bar arranged in the skeleton portion over a predetermined length, and the notch portion is exposed with a stirrup arranged in the skeleton portion. A cloth foundation using a precast base material, in which the groove portion of the precast base material is filled with filling concrete, and anchor bolts are planted in the filling concrete at predetermined intervals in the longitudinal direction. In addition, a vertical reinforcement bar is erected on the inner side, has a bolt insertion hole along the longitudinal direction on the lower surface, and a horizontal reinforcement bar is projected from the side surface of the lower end along the longitudinal direction. The wall slab is fixed by inserting the bolt through holes into the anchor bolts, and additional concrete is poured at the intersections of the horizontal and vertical reinforcing bars of the concrete wall slab and the precast foundation material. And

(2) Action In the construction and construction of the cloth foundation, the horizontally arranged precast foundation materials intersect each other at the exposed portions of the force distribution muscles, and the exposed muscles of the stirrup are bridged. Then, the filling concrete is poured into the groove portion of the precast base material. At this time, anchor bolts are embedded in the filled concrete, and vertical reinforcing bars are planted inward of the cloth foundation so as to intersect the exposed portion of the stirrup. After that, the precast concrete wall slab was placed directly on this cloth foundation,
It is fixed via anchor bolts. Further, the horizontal reinforcing bars of the precast concrete wall slab and the vertical reinforcing bars erected from the precast foundation material are intersected with each other, and additional concrete is poured into the parts.

According to this attachment structure of the cloth foundation and the concrete wall slab, a strong joint is obtained by the horizontal and vertical reinforcing bars in the overfilled concrete portion, and a continuous water stop portion is formed in the longitudinal direction.

(3) Example An example of the mounting structure of the concrete cloth foundation and the precast concrete wall slab of the present invention will be described with reference to the drawings.

1 to 4 show a concrete cloth foundation having a rectangular cross section according to one embodiment.

1 and 2 show a precast foundation material H which constitutes this concrete cloth foundation.

The precast base material H has a U-shaped cross section and is mainly composed of a reinforced concrete skeleton portion 1 which is long in the longitudinal direction.

That is, the skeleton part 1 includes side wall parts 2 arranged to face each other and a bottom plate part 3 connecting the bottom parts of the side wall parts 2,
A groove I is formed inside.

A notch 4 is formed in the upper portion of the side wall portion 2 so as to face the inside and is recessed in the longitudinal direction.

The width and height of the skeleton part 1 are determined to have predetermined dimensions as a rectangular cross section cloth foundation. That is, under the condition of the same supporting load,
The height h of the skeleton part 1 is about the same as the height of the conventional cloth foundation with footing, but its width b is made larger than the width of the standing wall of the conventional cloth foundation with footing, and is smaller than the bottom board. To be done. The length is preferably as long as possible, but is limited to about 8 m for transportation reasons.

The body part 1 has a cross-sectional structure in which the force distribution muscles 5 arranged in the horizontal direction and the stirrup 6 for connecting the force distribution muscles 5 to each other.
And concrete 7 that wraps these reinforcing bars.

The force distribution muscles 5 project from both side ends of the body portion 1, and the exposed portions 8
Has its tip 8a bent in a hook shape.

The upper end of the stirrup 6 is exposed in the notch 4, and the tip 6a is bent into a hook shape. In this embodiment, the stirrup 6 on both sides has the same height, but the upper end of the stirrup 6 on one side may be further extended (indicated by a broken line 6a ') and bent inward.

This precast base material H is manufactured in a factory, and concrete is finely finished by autoclave curing or the like. Further, although the level of the top end surface 2a of the both side wall portions 2 needs to be accurately made, it is finished at a high precision because it is manufactured in a factory.

3 and 4 show a cloth foundation structure constructed using the above-mentioned precast foundation material H.

In the figure, E is a ground, and a groove 10 is dug down to a suitable depth in the ground E, and a crushed stone 11 and leveled concrete 12 are placed at the bottom of the groove 10.

The precast base material H is installed on the leveled concrete 12.

Reference numeral 14 is filling concrete that is cast in the groove portion 1 of the precast base material H at the site. The upper surface 14a is aligned with the upper surface 2a of the precast base material H and forms a flat surface.

When pouring the filling concrete 14, a distribution bar 15 is installed so as to intersect with the upper part of the stirrup 6, and a transverse bar 16 can be arranged so as to intersect with the distribution bar 15.

Reference numeral 17 is an anchor bolt which is planted on the filled concrete 14 at appropriate intervals in the longitudinal direction. The anchor bolt 17 has a lower anchor portion 17a filled with concrete 1
It is embedded in the inside 4 and the upper screw part 17b rises vertically from the upper surface 14a of the filled concrete 14. Further, on the inner side of the cloth foundation, a vertical reinforcing bar 18 is planted in the filling concrete 14 so as to intersect the exposed portion 6a of the stirrup 6. The distance between the vertical reinforcing bars 18 is smaller than the distance between the anchor bolts 17, that is, they are densely arranged, but they do not overlap with the anchor bolts 17.

In the aspect in which the upper end portion of the stirrup 6 is extended as described above, this extended portion can be folded back and replaced with a vertical reinforcing bar.

Reference numeral 20 denotes a precast concrete wall slab that is placed on the upper surface of the cloth foundation, that is, the upper surface 14a of the filled concrete 14, and serves as the outer wall of the building, and has a predetermined thickness. In the lower part of the concrete wall slab 20, a concave portion 21 that opens inward is formed, and a mounting metal fitting 23 having a bolt insertion hole 22 that faces the concave portion 21 and through which the anchor bolt 17 is inserted is fixed. There is. Therefore, the recess 21 and the mounting bracket
23 are arranged at a constant interval so as to correspond to the anchor bolts 17, the diameter of the bolt insertion holes 22 is set to a size in which the anchor bolts 17 are loosely fitted, and the pitch thereof is the pitch of the anchor bolts 17. be equivalent to.

A horizontal reinforcing bar 25 is arranged below the concrete wall slab 20 so as to project from the inner surface of the concrete wall slab 20. The intervals of the horizontal reinforcing bars 25 are determined so as to be arranged between the vertical reinforcing bars 18 projecting from the cloth foundation at the set position of the concrete wall slab 20 on the cloth foundation.

Reference numeral 27 is a tightening nut that is screwed into the threaded portion 17b of the anchor bolt 17 protruding above the bolt insertion hole 22 of the mounting bracket 23.

Further, on the inside of the upper surface of the cloth foundation and the inside of the lower portion of the concrete wall slab 20, the additional concrete 28 is continuously laid along the longitudinal direction at the intersection of the above-mentioned vertical and horizontal reinforcing bars 18, 25. A part of the additional concrete 28 is filled in the recess 21 of the concrete wall slab 20.

Furthermore, in the figure, 30 is the backfill soil filled in the excavation trench 10, 31 is the rubble stone on the building side, and 32 is floor concrete.

The precast base materials H are joined to each other by intersecting the exposed portions 8 of the force distribution muscles 5, installing a formwork at the portions, and pouring concrete. Alternatively, instead of the mold, a precast base material for joining shown in FIG. 5 may be arranged.

That is, the I-type precast base material J shown in FIG. 5 (a) is used for the straight line portion, the L-type precast base material K shown in FIG. 5 (b) is used for the corner portion, and the T-shape shown in FIG. 5 (c) is used. The mold precast base material L is used for the orthogonal portion.

Since the precast foundation material H is used in the construction of the above-mentioned cloth foundation, the construction speed is further increased. In addition, since the precast base material H has an accurate rectangular shape, the plane of the upper surface 14a of the filled concrete 14 can be easily and accurately obtained, and therefore, a means such as height adjusting cement is applied to the upper surface of the cloth foundation. The precast wall slab 20 can be placed directly without the need.

Thus, the lower surface of the precast wall slab 20 is placed in close contact with the upper surface 14a of the cloth foundation, the precast wall slab 20 is firmly bonded by the additional concrete 28, and the water stopping property is also improved.

C. Effect of the Invention According to the mounting structure of the concrete cloth foundation and the precast concrete wall slab of the present invention, the rectangular cross section cloth foundation can be easily obtained by placing the filling concrete in the groove of the precast foundation material, and the construction of the cloth foundation. The construction speed in construction can be increased, and its quality and strength are improved. Then, the cloth foundation and the concrete wall slab are joined together through the anchor bolts, and a strong joint is obtained by the additional concrete cast at the intersection of the vertical reinforcing bar and the horizontal reinforcing bar, and The water proofing is improved by the overfilled concrete, and the deterioration of the foundation part from this part can be prevented.

[Brief description of drawings]

1 to 5 show an embodiment of an attachment structure of a concrete cloth foundation and a precast concrete wall slab of the present invention, and FIG. 1 is a perspective view showing one embodiment of a precast foundation material used for the cloth foundation. , Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is a cross-sectional view showing the installed condition of this concrete cloth foundation, Fig. 4 is a view in the X direction of Fig. 3, and Fig. 5 is another precast foundation. FIG. FIG. 6 is a sectional view of a conventional cloth foundation. H: precast base material, 1 ... body part, 2 ... side wall part, 3 ... bottom plate part, 4 ... notch part, 5 ... distribution reinforcing bar,
6 …… Star wrap, 14 …… Filled concrete, 17…
… Anchor bolts, 18 …… vertical reinforcing bars, 22 …… bolt insertion holes, 25 …… horizontal reinforcing bars, 28 …… increase concrete

Claims (1)

[Scope of utility model registration request] 1. A skeleton having a U-shaped cross section composed of side walls facing each other with a groove and a bottom plate connecting the bottoms of the side walls, and a notch is formed inside the upper edge of the side wall. Is provided in a recessed direction, the reinforcing bars arranged in the body part are exposed at both ends of the body part for a predetermined length, and the stirrup arranged in the body part is exposed in the cutout part. A cloth foundation using a precast foundation material, wherein the precast foundation material is filled with filling concrete in the groove portion of the precast foundation material, and the anchors are provided at predetermined intervals in the longitudinal direction in the filling concrete. Precast in which bolts are planted, vertical reinforcing bars are erected inward, and there are bolt insertion holes in the lower surface along the longitudinal direction, and horizontal reinforcing bars project from the lower end side surface in the longitudinal direction. Ko The cleat wall slab is fixed by inserting the bolt through holes into the anchor bolts, and additional concrete is poured at the intersections of the horizontal and vertical reinforcing bars of the concrete wall slab and the precast foundation material. A mounting structure of a concrete cloth foundation and a precast concrete wall slab.