JP2515227B2 - Installation method of cast-in-place concrete foundation and precast concrete wall slab - Google Patents

Description

Detailed Description of the Invention

A. OBJECT OF THE INVENTION (1) Field of Industrial Use The present invention relates to a cast-in-place concrete cloth foundation constructed in the field, more specifically, a precast concrete wall slab placed on the cloth foundation and the cloth foundation. Regarding mounting method.

(2) Conventional Technology As shown in FIG. 3, a conventional cast-in-place concrete foundation for small and medium-scale buildings has a convex cross section and is continuously formed in the horizontal longitudinal direction. That is, in FIG.
a is a wide bottom plate part that is fixedly placed on the foundation ground, b is a narrow standing wall part that rises from the center of the bottom plate part a, and a core part is constituted by these, and the distribution reinforcing bar c is formed in the core part.
Is arranged. By making the cross section convex in this way, a structure advantageous in terms of stress is realized. However, on the other hand, the shape is complicated, and the efficiency of the concrete driving is deteriorated. That is, a two-step construction in which the formwork of the bottom plate part a is assembled, concrete is placed in the part, and the formwork of the standing wall part b is assembled after placing the concrete and the concrete is placed. Therefore, the construction will be troublesome. 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 the standing wall b.
There is no special consideration other than the anchor bolts f planted above, and there is a problem with the strength of this joint. Furthermore,
If only the height adjusting cement e is used, the waterproofness between the outside and the inside of the building is insufficient, and deterioration of the foundation due to intrusion of rainwater from this part is also a problem.

(3) Problems to be Solved by the Invention In view of the above circumstances, the present invention provides a cast-in-place concrete cloth foundation with good workability, and in the above cloth foundation,
It is an object of the present invention to provide a mounting method capable of obtaining a strong bond with a concrete wall slab placed on the upper part thereof and good water blocking performance.

B. Configuration of the Invention (1) Means for Solving the Problem The method for attaching the cast-in-place concrete cloth foundation and the precast concrete wall slab of the present invention has the following configuration to achieve the above object. That is, the lower surface has a plurality of bolt insertion holes at predetermined intervals along the longitudinal direction, has a recessed portion that opens inward facing the bolt insertion holes, and extends in the longitudinal direction from the inner side surface of the lower end portion. A precast concrete wall slab having a plurality of horizontal reinforcing bars horizontally projected at a predetermined interval while avoiding the bolt insertion hole, and having a thickness of at least 2 than the thickness of the precast concrete wall slab.
With a width more than double, it has a substantially rectangular cross section, and a plurality of anchor bolts that are inserted into the bolt insertion holes of the precast concrete wall slab are planted in the center of the upper surface in the longitudinal direction, on the inner side of the upper surface. A method of attaching to a top of a cast-in-place concrete cloth foundation, which is arranged at an intermediate position of each horizontal reinforcing bar of the concrete wall slab and is planted with vertical reinforcing bars projecting intersecting with the horizontal reinforcing bars, After installing the precast concrete wall slab on the upper part of the cloth foundation by inserting the anchor bolts of the cloth foundation into its bolt insertion hole, the precast concrete wall slab and the horizontal and vertical reinforcing bars intersecting each other of the precast concrete wall slab and the cloth foundation. The precast concrete wall slab is characterized in that an additional concrete is poured into the concave portion.

(2) Action During construction and construction of the cloth foundation, the formwork is installed at intervals corresponding to the width of the cloth foundation, and then concrete is poured. When the precast concrete wall slab is installed on the cloth foundation, the anchor bolts are inserted into the bolt insertion holes to automatically maintain a predetermined positional relationship, and the horizontal reinforcing bars and the vertical reinforcing bars are intersected. Then, in the pouring of the additional concrete, a strong joint is obtained by the horizontal and vertical reinforcing bars, and a water blocking portion continuous in the longitudinal direction is formed.

(3) Example An example of the method for attaching the cast-in-place concrete cloth foundation and the precast concrete wall slab of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an example of application of the embodiment to a cloth foundation for a medium-scale building. That is, FIG. 1 shows a sectional structure after the construction, and FIG. 2 shows a side surface structure of a main part during the construction.

Referring to FIGS. 1 and 2, reference numeral 1 denotes a cast-in-place concrete cloth foundation (hereinafter abbreviated as cloth foundation) constructed by the method of the present invention, which is a groove formed by digging the ground E to an appropriate depth. The cracked stone 3 and the leveling concrete 4 are placed on the groove bottom 2a of 2 to be installed.

The body portion of the cloth foundation 1 is made of reinforced concrete, has a rectangular or square cross section, and is formed to be long in the horizontal direction. That is, the upper surface, that is, the top end 1a and the lower surface are horizontal, the side surface 1b is substantially vertical, and the side surface 1b is inwardly inward with respect to vertical moldability in consideration of mold release from the mold. You can tilt up. The skeleton part of the cloth foundation 1 is composed of a reinforcing bar 6a arranged inside and extending along the longitudinal direction, a reinforcing bar 6 such as a stirrup 6b surrounding the distributing bar 6a, and concrete 8. In this cloth foundation 1, the height is about the same as that of the conventional cloth foundation under the condition of the same supporting load, but the width of the top end 1a is made larger than the width of the standing wall portion of the conventional cloth foundation. The width is smaller than the bottom plate.

A plurality of anchor bolts 10 are embedded in the central portion of the upper surface 1a of the cloth foundation 1 at appropriate intervals in the longitudinal direction and the upper portions of which protrude from the upper surface 1a of the cloth foundation 1.
The anchor bolt 10 has a lower anchor portion 10a embedded in the cloth foundation 1, and an upper screw portion 10b rises vertically from the upper surface 1a of the cloth foundation 1. Further, on the inner side of the cloth foundation 1, a vertical reinforcing bar 12 having a strength similar to that of the distribution reinforcing bar 6 a is appropriately spaced in the longitudinal direction of the cloth foundation 1 so that the upper part thereof protrudes from the upper surface of the base 1. Will be planted. The distance between the vertical reinforcing bars 12 is smaller than the distance between the anchor bolts 10, that is, the distance between the anchor bolts 10 is small.
So that they do not overlap.

A precast concrete wall slab 14 is placed on the cloth foundation 1 and serves as an outer wall of the building, and has a predetermined thickness. The concrete wall slab 14 is provided with a recess 15 at the bottom thereof, which opens inward, and a fitting 18 having a bolt insertion hole 17 through which the anchor bolt 10 is inserted and which faces the recess 15 is fixed. There is. Therefore, the recess 15 and the mounting member 18 are arranged at a constant interval so as to correspond to the anchor bolt 10, and the diameter of the bolt insertion hole 17 is set to a size that allows the anchor bolt 10 to be loosely fitted. The pitch is equal to the pitch of the anchor bolt 10.

A plurality of horizontal reinforcing bars 20 are arranged below the concrete wall slab 14 so as to project horizontally from the inner surface of the concrete wall slab 14. The intervals of the horizontal reinforcing bars 20 are determined so that they are arranged between the vertical reinforcing bars 12 projecting from the cloth foundation 1 at the set position of the concrete wall slab 14 on the cloth foundation 1.

The concrete wall slab 14 is supported on the upper surface 1a of the cloth foundation 1 through an appropriate interposing member, for example, several iron plates (not shown), and the lower surface of the concrete wall slab 14 and the cloth foundation 1 are supported. The filling mortar 22 is filled in the gap formed between the upper surface 1a and the upper surface 1a. Reference numeral 24 is a tightening nut that is screwed into the threaded portion 10b of the anchor bolt 10 protruding above the bolt insertion hole 17 of the mounting member 18.

On the inside of the upper surface of the cloth foundation 1 and the inside of the lower part of the concrete wall slab 14, these vertical and horizontal reinforcing bars 12, 20 are provided around these intersections of the vertical and horizontal reinforcing bars 12, 20. The additional concrete 26 is continuously cast in the buried state along the longitudinal direction. A part of the overfilled concrete 26 is a concrete wall slab 14
Filled in the concave portion 15. Further, in the figure, 30 is the backfill soil filled in the groove 2, 31 is the rubble stone on the building side, 3
2 is floor concrete.

The method of attaching the upper part of the cloth foundation and the wall slab in the cast-in-place concrete cloth foundation of this embodiment is carried out according to the following procedure.

(1) The ground E is dug down to an appropriate depth, and the scouring stones 3 are laid on the groove bottom 2a of the groove 2 along the building direction of the cloth foundation and solidified.

(2) Next, the leveling concrete 4 is cast on the split stone 3 and the upper surface thereof is used as the level surface.

(3) The formwork is arranged in the longitudinal direction on the leveling concrete 4 with a predetermined interval. The reinforcing bars 6 are formed in the formwork, and anchor bolts 10 are erected at a predetermined interval along the longitudinal direction at the center of the upper part, and a vertical reinforcing bar 12 is provided at the inner side of the upper part in the longitudinal direction. Are installed upright at a predetermined interval along. It should be noted that the interval between the molds facing each other is the width of the cloth foundation 1, and the height thereof is equal to or higher than the height of the cloth foundation 1. Then, cast concrete in the formwork and wait for its consolidation.

(4) When the concrete of the cloth foundation 1 is solidified, the precast concrete wall slab 14 is hung on the upper part of the cloth foundation 1 and the anchor bolt 10 is inserted into the bolt insertion hole 17 for installation. At this time, the concrete wall slab 14 is temporarily received on the cloth foundation 1 via the interposing member such as an iron plate as described above.

(5) Determine the level of the concrete wall slab 14,
Also, after confirming that the vertical and horizontal reinforcing bars 12 and 20 are arranged at predetermined positions in a cross shape, a mortar 22 is placed in the gap between the upper surface of the cloth foundation 1 and the lower surface of the concrete wall slab 14. .

(6) When the mortar 22 is solidified, the tightening nut 24 is screwed into the threaded portion 10b of the anchor bolt 10 and rotationally tightened to fix the concrete wall slab 14.

(7) Next, a form is placed on the inner side of the upper surface of the cloth foundation 1, and the additional concrete 26 is poured so as to embed the vertical and horizontal reinforcing reinforcing bars 12 and 20. The additional concrete 26 is poured so as to be filled also in the concave portion 15 of the concrete wall slab 14.

(Effects of the embodiment) According to the cloth foundation 1 constructed by the method of this embodiment, the cloth foundation 1 is constructed by the above-mentioned procedure. Therefore, it is only necessary to install the formwork and the concrete. Therefore, construction efficiency is good. When installing the precast concrete wall slab 14 on the cloth foundation 1,
When the anchor bolt 10 is inserted into the bolt insertion hole 17, a predetermined positional relationship is automatically maintained, and the horizontal reinforcing bar 20
And the vertical reinforcing bar 12 are crossed. Further, in the place where the additional concrete 26 is placed, it is strongly reinforced by the vertical and horizontal reinforcing bars 12 and 20, so that not only the bond between the cloth foundation 1 and the precast concrete wall slab 14 is strengthened, but also Concrete part 26 is cloth foundation 1
Since it is continuous in the horizontal longitudinal direction, it has watertightness and reliably blocks water flow between the outside and the inside of the building. Further, the overfilled concrete 26 is also filled in the recesses 15 and solidified to further promote the integration of the cloth foundation 1 and the precast concrete wall slab 14.

C. EFFECTS OF THE INVENTION According to the method of attaching the cast-in-place concrete cloth foundation and the precast concrete wall slab of the present invention, since the cloth foundation has a rectangular cross section, the installation work of the formwork becomes easy, and
The efficiency of construction is improved because it is only necessary to cast concrete once. Further, when the precast concrete wall slab is installed on the cloth foundation, the horizontal reinforcing bars and the vertical reinforcing bars are automatically intersected by inserting the anchor bolts into the bolt insertion holes, and a predetermined positional relationship is maintained. Further, in the cast-in portion of the additionally reinforced concrete, it is strongly reinforced by the vertical and horizontal reinforcing bars, a strong bond between the cloth foundation and the concrete wall slab is obtained, and the waterproofness is improved,
It is possible to prevent deterioration of the base portion from this portion.
Further, the overfilled concrete is also filled in the recesses and solidified to further promote the integration of the cloth foundation and the precast concrete wallboard.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an application example of a method for attaching a cast-in-place concrete cloth foundation and a precast concrete wall slab of the present invention to a cloth foundation for small-scale buildings.

FIG. 2 is an enlarged view taken along the arrow X in FIG.

FIG. 3 is a cross-sectional view of a conventional cloth foundation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cloth foundation, 1a ... Top surface (top surface), 10 ... Anchor bolt, 12 ... Vertical reinforcing bar, 14 ... Precast concrete wall slab, 15 ... Recessed part, 17 ... Bolt insertion hole, 20 ...
Horizontal reinforcement, 26 ... Reinforced concrete

Claims (1)

(57) [Claims] 1. A lower surface having a plurality of bolt insertion holes at predetermined intervals along the longitudinal direction, a concave portion opening inwardly facing the bolt insertion holes, and an inner side surface of a lower end portion. A precast concrete wall slab that avoids the bolt insertion holes along the longitudinal direction and horizontally projects a plurality of horizontal reinforcing bars at a predetermined interval, and has a width that is at least twice the thickness of the precast concrete wall slab. Have
A plurality of anchor bolts, which have a substantially rectangular cross section and are inserted in the bolt insertion holes of the precast concrete wall slab in the longitudinal direction in the center of the upper surface, are planted horizontally on the inner side of the upper surface. A method for mounting on a top of a cast-in-place concrete cloth foundation, which is arranged at an intermediate position of the reinforcing bar and in which vertical reinforcing bars projectingly intersect with the horizontal reinforcing bars are planted. After installing the wall slab by inserting the anchor bolt of the cloth foundation into its bolt insertion hole, in the intersection of the horizontal and vertical reinforcing bars of the precast concrete wall slab and the cloth foundation and the recess of the precast concrete wall slab Pour-in-place concrete foundation and precast, characterized by placing additional concrete Method of mounting the Nkurito wall version.