JP2997986B2 - Construction method of foundation with foundation for building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a foundation with a base in a building, in particular, a two-by-four house (frame wall method).

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a two-by-four house is a reinforced concrete having a substantially inverted T-shaped cross section having a seat portion 3a and a rising portion 3b on a discarded concrete layer 2 formed by covering a chestnut stone 1. A foundation 3 made of steel is constructed, and a base 4 is placed on the foundation 3. The base 3 is generally buried in the lower half in the soil 5 and has a moisture-proof film 6 on the indoor side.
A moisture-proof concrete layer 7 is provided through the base. An anchor bolt 8 is embedded in a rising portion 3b of the foundation 3, and an upper end portion 8a of the anchor bolt 8 protrudes from a top mortar layer 9 formed on the top surface of the rising portion 3b.

A large number of the anchor bolts 8 are arranged at predetermined intervals in the longitudinal direction of the foundation 3. Therefore, when the base 4 is installed after the foundation 3 is constructed, a hole 4a is formed in the base 4 and the base 4 is attached to the top mortar layer 9 while the upper end 8a of the anchor bolt 8 is inserted through the hole 4a. Install on top and fasten nuts. Note that reference numeral 1
0 is a joist and 11 is a floorboard.

The foundation 3 is constructed through the steps shown in FIG. That is, first, as shown in FIG. 5 (A), reinforcement is provided between a pair of temporary frames 12 and 12 assembled on the discarded concrete layer 2 and concrete is cast and cured to cure the foundation 3. Of the temporary frame 1
Remove 2,12.

Next, as shown in FIG. 5 (B), reinforcement is provided between the pair of temporary frames 13 and 13 assembled on the seat portion 3a, and concrete is poured into the temporary frames 13 so that the foundation 3 rises. The part 3b is formed. At this time, the rising portion 3b
An anchor bolt 8 is embedded in the temporary frame 13 after curing.
13 is removed.

As shown in FIG. 6 (A), the rising portion 3b has a wavy or uneven rough surface at the top end 14 and is not suitable for horizontally supporting the entire bottom surface of the base 4. Therefore, the top mortar layer 9 as described above must be formed. For this reason, as shown in FIG. 6A, the relief black 15 is hit on both sides of the rising portion 3 b, and a plate 16 having a predetermined width is attached along the relief black 15. The plates 16, 16 attached to both sides of the rising portion 3b are shown in FIG.
As shown in (1), it is clamped by the temporary fixing jig 17 and fixed to the rising portion 3b. Therefore, the top end mortar layer 9 is formed by spreading the mortar to the top of the plates 16, 16 to fill the entire top end, and the construction work of the foundation 3 is completed by removing the plates 16, 16. Layer 9
The base 4 is set on the.

[0007]

In the above prior art, it is indispensable to form the top mortar layer 9 in the construction until the foundation 3 is completed, and the work process is complicated. That is, as described above, after forming the rising portion 3b, it is necessary to perform the work of marking out the escape black ink 15, the work of attaching the plates 16, 16, the mortar painting work, and the smoothing work. For this reason, it is difficult to reduce the construction period and cost.

In addition, since the base 4 is not directly supported on the rising portion 3b of the foundation 3 but is supported by the fragile top mortar layer 9, the top mortar layer is subjected to a heavy load. 9 may be cracked. In addition, if the surface of the top mortar layer 9 is not horizontal and flat, but is wavy or inclined, the base 4 itself installed later suitably supports the load of the building. Cannot be performed, which causes quality problems.

Further, as described above, the anchor 4 is planted when the foundation 3 is constructed, and then the base 4 is installed. Therefore, the holes 4a are formed in the base 4 before the base 4 is installed. When drilling a hole, the hole 4a must be drilled while measuring while corresponding to the position of the anchor bolt 8, which is difficult to perform. In other words, many anchor bolts 8 are planted below the predetermined interval in the longitudinal direction of the foundation 3 by design, but it is inevitable that a slight error occurs in the interval at the actual site. Therefore, the drilling operation must be performed while measuring and confirming the position of the hole 4a to be formed in the base 4 on site.

[0010]

Means for Solving the Problems The present invention provides a method of constructing a foundation with a base, which solves the above-mentioned problems.
When concrete is cast in the casting space between 3 and 33 to form the foundation rising portion 23b: The base 24 on which the anchor bolts 28 are suspended is attached to the inner surface of the temporary frame 33 located outside the room. By temporarily fixing the base 24, the base 24 and the auxiliary member 31 are placed near the outdoor side of the placement space and fixed in a state where the bottom surface of the auxiliary member 31 is flush with the base 24, and the base 24 is positioned on the indoor side of the base 24 and driven. A step of opening the upper opening U of the space; after that, concrete is poured from the upper opening and filled into the casting space, and the concrete rises above the bottom surface of the base 24 near the upper opening U. Upright portion 23 of the foundation 23 for curing the poured concrete, curing the anchor bolt 28 and supporting the bottom of the base 24.
b), and then removing the temporary frames 33, 33 together with the attachment member 31 to form a base.
Forming a base rising portion 23b supporting the bottom of the base 24;
And the top of the outdoor portion 37 of the base rising portion 23b.
On the surface, a horizontal surface on the outdoor side in a state flush with the bottom of the base 24
This is to form an outer wall margin 36 that extends .

[0011]

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a foundation with a foundation built in a two-by-four house according to the method of the invention. A base 23 made of reinforced concrete having a substantially L-shaped cross section having a seat portion 23a and a rising portion 23b is constructed on a discarded concrete 22 formed by covering the chestnut stone 21, and a base 24 is installed on the base 23. Have been. About one third of the foundation 23 is buried in the soil 25, and a moisture-proof concrete layer 27 is provided on the indoor side via a moisture-proof film 26. At the top of the rising portion 23b of the foundation 23, an anchor bolt 28 is embedded near the outdoor side,
The upper end 28a of the anchor bolt 28 is
4a, and the nut is fastened. A large number of the anchor bolts 28 are arranged at predetermined intervals in the longitudinal direction of the foundation 23 and the base 24. Reference numeral 30 denotes a joist and reference numeral 31 denotes a floor plate.

The foundation with the base is constructed through the steps shown in FIG.

First, as shown in FIG. 2 (A), reinforcement is provided between a pair of temporary frames 32, 32 assembled on the discarded concrete layer 22, and concrete is cast and cured to cure the foundation. 23 are formed, and the temporary frames 32, 32 are removed.

Next, as shown in FIG. 2B, a casting space S having an opening U at an upper portion is defined between the pair of temporary frames 33, 33 assembled on the seat portion 23a. This casting space S is wider than the prior art shown in FIG. 5B, and the inner temporary frame 33 is arranged along the indoor side end of the seat 23a. The temporary frames 33 are fixed by a well-known separator metal fitting or the like.

Prior to forming the rising portion 23b of the foundation 23, an anchor bolt 28 is suspended from the base 24 in advance. That is, holes 24a are drilled at intervals in the longitudinal direction of the base 24 in accordance with the dimensions based on the design values, the anchor bolts 28 are inserted through the holes 24a, and the nuts are fastened. Vertically.

Then, the base 24 with the anchor bolts 28 faces the opening U of the casting space S, and is arranged and fixed near the outdoor side. Therefore, the other side of the base 24, that is,
On the indoor side, the opening U is left open.
In the illustrated embodiment, an attachment member 34 facing the opening U from the side is provided on the inner side surface of the temporary frame 33 located on the outdoor side. It is temporarily fixed to the temporary frame 33 by the fixing means.

Thereafter, concrete C is poured from the opening U and filled in the casting space S, and the concrete C is filled so as to rise above the bottom surface of the base 24 near the opening U. . That is, the concrete C filled in the casting space S is, as shown in FIG.
It has a raised portion 35 that rises upward from the bottom surface of the base 24 by a predetermined dimension D.

When the concrete C is cured in this state, as shown in FIG. 3, it receives a downward load DN due to its own weight of the raised portion 35, and an upward fluid force UP acts below the base 24. For this reason, the concrete C is cured while being brought into close contact with the lower surface of the base 24,
There is no nest below 4 and the filling degree is high, and further, a rising portion 23b in which the base 24 is integrated is formed.
In addition, since the auxiliary member 34 is disposed outside the room of the base 24, the concrete C does not overflow therefrom.

After that, the temporary frame 3 together with the attachment member 34
By removing 3, 33, the base 2 as shown in FIG.
The foundation 23 with 4 is completed. As shown in the drawing, the bottom surface of the attachment member 34 is arranged flush with the bottom surface of the base 24, so that the rising portion 23 b of the formed base 23 is located outside the base 24 and the outer wall margin 36. To form

[0022]

According to the present invention, the rising portion 2 of the foundation 23 is provided.
When forming the base 3b, the concrete C is cast in a state where the base 24 is placed in the setting space S, and the rising portion 23b integrally provided with the base 24 is formed. Since the base 24 is directly supported by the portion 23b, a strong and high-quality base with a base can be provided.

Since the mortar coating operation and the leveling operation for forming the top mortar layer 9 as in the prior art, and the associated blacking-out operation of the relief ink 15 are not required, the construction period is greatly reduced. Thus, a significant cost reduction can be achieved.

Further, since the anchor bolt 28 can be set on the base 24 before the foundation 23 is constructed,
It is not necessary to perform strict dimension measurement as in the related art, and the hole 24a to be drilled can be easily positioned.

Further, according to the present invention, when the concrete C is poured into the placing space S in which the base 24 with the anchor bolts 28 is set, the concrete C is placed near the upper opening U of the placing space S. Since the filling is performed so as to rise above the bottom surface of the concrete 24, during the curing, the upward flow force UP of the concrete C is applied below the base 24 by the downward load DN caused by the weight of the raised ridge 35, and As a result, it is possible to obtain the rising portion 23b without a nest, and to provide a foundation with a high load strength in which the rising portion 23b is suitably brought into close contact with the entire lower surface of the base 24.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a building using a foundation with a base constructed according to an embodiment of the method of the present invention.

FIG. 2 shows one embodiment of the method of the present invention, wherein (A) is a cross-sectional view showing steps for forming a base seat, (B)
Is a cross-sectional view showing a process for forming the rising portion of the foundation,
(C) is sectional drawing which shows the foundation with a base after formation.

FIG. 3 is a cross-sectional perspective view showing an operation when forming a rising portion of a foundation in one embodiment of the method of the present invention.

FIG. 4 is a cross-sectional view showing a building using a foundation with a base constructed by a conventional method.

5A and 5B show a conventional method, in which FIG. 5A is a cross-sectional view showing a process for forming a seat portion of a foundation, and FIG. 5B is a cross-sectional view showing a process for forming a rising portion of the foundation. , (C)
FIG. 4 is a cross-sectional view showing a process for forming a top mortar layer at a rising portion.

6A and 6B show a process for forming a top mortar layer in a conventional method, in which FIG. 6A is a cross-sectional perspective view showing an operation for printing out the escape black ink, and FIG. It is a perspective view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 23 foundation 23a seat 23b rising part 24 base 24a hole 28 anchor bolt 28a upper end 32 temporary frame 33 temporary frame 34 attachment member 35 ridge

Claims (1)

(57) [Claims] When a concrete is cast in a space between a pair of temporary frames 33, 33 to form a foundation rising portion 23b: a temporary frame in which an anchor bolt 28 is suspended is positioned outside the room. By temporarily fixing the inner surface of the base 33 via the attachment member 34 via the attachment member 34, the base 24 and the attachment member 31 are arranged and fixed near the outdoor side of the casting space with the bottom surfaces of the attachment member 31 flush with each other. A step of opening the upper opening U of the casting space located on the indoor side of the vehicle; then, casting concrete from the upper opening and filling the casting space, and placing the concrete in the vicinity of the upper opening U. A step of filling so as to rise above the bottom of the base 24; curing the cast concrete, embedding the anchor bolts 28, and supporting the bottom of the base 24;
3) forming a rising portion 23b, and then removing the temporary frames 33, 33 together with the attachment member 31, thereby forming a base rising portion for supporting the bottom of the base 24.
23b, and the base rising portion 23b is formed.
The top surface of the outdoor portion 37 is flush with the bottom surface of the base 24.
To form an outer wall allowance 36 extending as a horizontal surface outside the room
How to build a foundation with a foundation in the building, characterized in that that.