JP2554422B2 - Manufacturing method of precast concrete block for building foundation - 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 manufacturing a precast concrete (PC) block for a building foundation, and can be used particularly when constructing a unit building.

[0002]

BACKGROUND ART The foundation of a building is generally made by assembling a formwork at a construction site and placing concrete in this formwork. However, in a unit building, a PC block foundation prepared in advance in a factory is used in order to increase the industrialization rate.

FIG. 6 shows a part of the PC block foundation 60. According to the figure, the PC block foundation 60 is composed of a footing member 61 and a rising member 62 having a predetermined length. The riser members 62 are adapted to be joined at the ends 63A, which is why the ends of each riser member 62 are
63A is an enormous part having a width dimension larger than that of the main body part 63. These end portions 63A have recesses 66 that are open to the outer end side.
Are formed. Due to the recess 66, the end portion 63A is provided with a first extending portion 64 linearly extending from the main body portion 63 and a second extending portion 65 parallel to the first extending portion 64, and these extending portions are provided. The outlets 64, 65 are joined at the base 69 and therefore the end 63
A has a flat U shape. When such a rising member 62 is produced in a factory, a predetermined reinforcing member, an upper end streak, a lower end streak, and the like are arranged in the molding frame of the rising member 62, and concrete slurry is poured. When connecting the rising members 62, a reinforcing member made of a stirrup 67 or the like is provided in each recess 66 of the rising members 62.
68 is provided, and concrete slurry is cast in the recess 66 to connect the two rising members 62, 62.

[0004]

However, in the method of manufacturing the PC block foundation 60 as described above, the first and second extending portions 64 and 65 are sandwiched between the end portion 63A of the rising member 62 and the recess portion 66. The PC block foundation 60 is manufactured by placing concrete slurry on a molding frame. In such a manufacturing method, the rising member 62
Since the end portion 63A of the PC has a complicated shape such as a U-shape in a plan view, there is a problem in that it is difficult for the concrete slurry to flow to every corner and it is difficult to manufacture the PC block foundation 60.

It is an object of the present invention to provide a method for manufacturing a precast concrete block for a building foundation, which can easily form a planar U-shape at the connecting end.

[0006]

Therefore, a first aspect of the present invention is a precast concrete block for a foundation of a building having a U-shape in a plan view , which has recesses whose ends connected to each other are open toward the outer end. In the manufacturing method, the end portion of the precast concrete block is formed of a main body and an ancillary portion that are arranged to face each other with the recessed portion interposed therebetween, and the annexed portion is pre-manufactured in advance , and then the main body is produced at the time of manufacturing the main body
It is arranged on the upper surface side of the manufacturing mold and has a thickness dimension
Is fixed and is supported by the dimensions equally formed support member of the saw unit before <br/> Symbol Body method foundation for precast concrete block building, characterized in that it is integrated with the body It is what

A second aspect of the invention is a method of manufacturing a precast concrete block for a foundation of a building, which has a U-shape in a plan view and has recesses whose ends are connected to each other and open toward the outer end. Precast concrete for a building foundation in which a main body and an ancillary part, whose ends are opposed to each other with the end of the concrete block interposed therebetween, are formed as separate bodies, and the main body and the ancillary part are connected to integrate the two. This is a block manufacturing method.

[0008]

In the first aspect of the invention as described above, the precast concrete block for the foundation of a building has a prefabricated auxiliary part and a supporting member arranged on the upper surface side of a mold for manufacturing the main body.
And is fixed to the main body at the time of manufacturing the main body, and is integrated with the main body to be manufactured. If the prefabricated accessory is fixed to the main body and the two are integrated, the thickness of the support member will be reduced.
Since the size is equal to the size of the recess, the end having the recess can be easily formed, and the precast concrete block for the foundation of the building having the flat U-shaped end can be easily manufactured. It

In the second aspect of the invention, the precast concrete block for the foundation of the building is manufactured by connecting the prefabricated auxiliary part and the main body. The auxiliary part and the main body are manufactured in advance, and if these are connected, it becomes an end having a recess, and a precast concrete block for a building foundation having a planar U-shaped end can be easily manufactured. To be achieved.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a precast concrete block 1 for a foundation manufactured by the manufacturing method according to this embodiment (hereinafter,
The edge of the PC block is shown). PC
The block 1 includes a footing member 2 made of PC and a rising member 3 made of PC arranged on the footing member 2.

The rising member 3 is formed with a recess 4 which is open toward the outer end, and the rising member 3 has a main body 5 which is disposed to face the recessed member 4 and which is attached to the main body 5. And a part 6. End 7 of body 5
Is inside the width of the central part 8 of the main body 5 (obliquely right side in FIG. 1)
Is slightly narrower.

The auxiliary portion 6 is connected to the outside of the central portion 8 of the main body 5, and a distal end portion which is continuous with the proximal end portion 9 and extends toward the outer end portion and is parallel to the central portion 8. 10 and is formed in a cap shape of a substantially fountain pen on a plane. The tip portion 10 is formed to be slightly narrower outside the width of the base portion 9 (obliquely left side in FIG. 1). In this way, the end portion 7 of the main body 5 and the tip end portion 10 of the auxiliary portion 6 form the recessed portion 4, thereby forming a planar U-shape.

2 and 3 show a first embodiment for manufacturing the rising member 3 as described above. In this embodiment, the accessory 6A is manufactured in advance.
Inside the 6A, there is embedded a bar arrangement 20 extending from the tip end portion 10A to the base end portion 9A and bent from the tip end portion 10A toward the main body 5A side by approximately 90 degrees.

The main body 5A is formed by pouring concrete slurry 23 in a mold 21 shown in FIGS. 2 and 3 with a crucible 22 or the like. The mold 21 is formed in a box shape having a width H corresponding to the height of the main body 5A of the rising member 3, a height W corresponding to the width of the central portion 8 of the main body 5A, and a predetermined length. The end of the mold 21 is a stepped portion 11 having a height W1 which is lower than the height W. The portion formed by the step portion 11 is the end portion 7 of the main body 5A corresponding to the end portion 7 of the main body 5 in FIG.

A hollow box-shaped support member 24 is provided in the stepped portion 11 of the mold 21 so as to be freely inserted and removed. The thickness dimension of this support member 24 should not be equal to the dimension of the depression 4.
ing. Therefore, when the accessory 6A is placed on the mold 21, it can come into contact with the lower surface of the tip 10A of the accessory 6A, and the width is wider than the width H of the mold 21. It is formed in a size protruding outward from the end.

A plurality of bar arrangements 26 are arranged in the formwork 21,
This bar arrangement 26 is fixed by placing concrete slurry 23. Further, the reinforcing bar 26 can be engaged with the reinforcing bar 20 of the auxiliary section 6A, and when the auxiliary section 6A is installed, the reinforcing bars 26, 20 are fixed to each other by welding. When attaching the accessory 6A to the mold 21, the accessory 6A is placed on the support member 24, and the accessory 6A, the support 24, and the mold 21 are connected by a band 27 or the like, and are further firmly fixed. It is like this.

Next, the operation of this embodiment will be described. Formwork 21
Attach the support member 24 on the step 11 of the
Place 6A. At this time, while arranging so that the base end portion 9A of the auxiliary portion 6A is located in the inside of the form 21, the bar 20 of the auxiliary part 6A is engaged with the bar 26 of the main body 5A to weld them together. The annex 6A is fixed to the form 21. Further, the band 27 and the like are turned around the auxiliary portion 6A, the support member 24, and the mold 21 to firmly fix them.

Next, the concrete slurry 23 is cast on the mold 21 by the crucible 22. When the concrete slurry 23 is filled in the mold 21 and then solidified, the band 27 and the like are removed, and the support member 24 is further removed. PC in this way
The rising member 3 made of metal is formed. In addition, in order to connect the rising member 3 as described above, a reinforcing member made of stirrup or the like is provided in the hollow portion 4 and the concrete slurry 23 is placed in the hollow portion 4 as in the prior art. To do.

According to the above-described embodiment, the following effects can be obtained. That is, in order to manufacture the rising member 3 having a flat U-shaped end, the previously manufactured auxiliary portion 6A is fixed to the mold 21 for manufacturing the main body 5A of the rising member 3, and the rising member 3 is fixed to the mold 21. It is only necessary to pour the concrete slurry 23, and by solidifying the concrete slurry 23, the annex 6A
Since the main body 5A is integrated with the main body 5A, the rising member 3 can be easily manufactured.

Also, the recess 4 at the end of the rising member 3
Since the support member 24 may be interposed between the auxiliary portion 6A and the main body 5A in order to form the above, the recessed portion 4 can be easily formed. Furthermore, in order to fix the accessory part 6A to the form 21, in addition to engaging and welding the reinforcement bars 20 and 26 of both, since it is also tied by the band 27, etc., it can be fixed more firmly, therefore, Since the ancillary portion 6A does not become unstable when the concrete slurry 23 is cast on the form 21, the rising member 3 with high accuracy can be manufactured.

FIG. 4 shows a second embodiment for producing the rising member 3. This embodiment is different from the first embodiment in that the main body 5A of the first embodiment is also made of a prefabricated PC. That is, the accessory part 6B made of PC and the main body 5B are later joined to integrate them.

The overall shape of the attachment 6B is the same as that of the attachment 6A of the first embodiment, and therefore the details thereof will be omitted.
A counterbore hole 30 is formed in the base end portion 9B of the auxiliary portion 6B,
A bolt 31 can be inserted into the counterbore 30.
The overall shape of the main body 5B is also the same as that of the main body 5 of the PC block 1 described above, and therefore the details thereof will be omitted.
An embedded nut 35 is previously embedded in the central portion 8A of the main body 5B, and a bolt 31 inserted from the side of the accessory portion 6B is screwed into the embedded nut 35.
Thus, the bolt 31 and the embedded nut 35 are screw-engaged with each other, and the accessory portion 6B and the main body 5 are integrated with each other, whereby the rising member 3 made of PC is formed.

In the second embodiment as described above, the accessory portion 6B made of PC is brought into contact with the main body 5B, the bolt 31 is inserted from the counterbore hole 30 of the accessory portion 6B, and the bolt 31 is screwed into the embedded nut 35. , The attachment part 6B is integrally connected to the main body 5B. In order to connect the rising members 3 as described above, as described above, a reinforcing member made of stirrup or the like is provided in the hollow portion 4, and the concrete slurry is placed in the hollow portion 4.
Place 23 and perform.

In such a second embodiment, the attachment 6B and the main body
5B is made of PC manufactured in advance, and these are connected by screwing the bolt 31 and the embedded nut 35. Therefore, the rising member 3 made of PC having the recessed portion 4 at the end is formed.
Has the effect that it can be easily manufactured.

FIG. 5 shows a third embodiment for producing the rising member 3. In this embodiment, as in the second embodiment, the accessory part 6C and the main body 5C are made of PC, which is manufactured in advance, and both are joined and integrated later.

The overall shapes of the auxiliary body portion 6C and the main body 5C are the same as those in the above-mentioned respective embodiments, and therefore the details thereof will be omitted. Inside the annex body portion 6C, there is provided a bar arrangement 40 installed in the longitudinal direction of the annex part 6C. Further, a protrusion extending orthogonal to the bar arrangement 40 and extending to the outside of the annex part 6C and the main body 5C side. A bar arrangement 41 is provided.

On the other hand, inside the main body 5C, there is also a bar arrangement 42 installed in the longitudinal direction of the main body 5C.
A protruding bar 43 is provided which is orthogonal to 42 and extends to the outside of the main body 5C and to the side of the auxiliary portion 6C. This protruding bar 43
Can be engaged with the projecting bar 41 of the attached portion 6C, and both are fixed by, for example, flare welding 44 or the like. In order to connect the rising members 3 as described above, as described above, a reinforcing member made of stirrup or the like is provided in the recess 4 and the concrete slurry 23 is placed in the recess 4. To do.

In the third embodiment as described above, the accessory portion 6C and the main body 5C are made of PC which is manufactured in advance, and the connection between the two is fixed by flare welding 44 or the like between the projecting reinforcement bars 43 and 41. Therefore, it is possible to easily manufacture the rising member 3 made of PC having the recess 4 at the end. Further, in the third embodiment, the projecting reinforcements 43, 41 need only be provided by bending the existing reinforcements, and special work such as embedding an embedding nut or the like in the auxiliary portion 6C and the main body 5C is performed. Since it does not need to be provided, there is an effect that the labor for that is saved, and as a result, the manufacturing of the rising member 3 made of PC becomes easier.

The present invention is not limited to the above-mentioned embodiments but includes the following modifications. That is, in the first embodiment, the supporting member 24 interposed between the stepped portion 11 of the mold 21 and the auxiliary portion 6A is a box-shaped member, but the present invention is not limited to this. For example, a rectangular member having a rib in the inserting direction. It may be a gutter shape. In this way, the support member can be easily manufactured.

Further, the planar U-shape formed at the end of the rising member 3 in each of the above-mentioned embodiments is formed by the end 7 of the main body 5 and the tip 10 of the auxiliary portion 6, both of which are flat. It is only necessary to form a U-shape, and for example, the end portion 7 on the main body 5 side may have the same width as the central portion 8 or the stepped portion of the auxiliary portion 6 may be eliminated. The point is that the recess 4 that connects the rising members 3 may be formed.

Further, in the second embodiment, the bolt 31 is provided on the side of the auxiliary portion 6B and the embedded nut 35 is embedded on the side of the main body 5B, but these may be provided in reverse, that is, on the side of the additional portion 6B. The embedded nut 35 may be embedded and the bolt 31 may be provided on the main body 5B side. In short, it suffices if the accessory part 6B and the main body 5B can be connected.

In addition, the specific structure and shape for carrying out the present invention may be any other structure as long as the object of the present invention can be achieved.

[0033]

As described above, according to the method for manufacturing a precast concrete block for a building foundation of the present invention, it is possible to easily form the planar U-shape of the end portion of the precast concrete block .

[Brief description of drawings]

FIG. 1 is a perspective view of a rising member manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a first embodiment for manufacturing a rising member.

FIG. 3 is a perspective view of the first embodiment.

FIG. 4 is a vertical sectional view showing a second embodiment for manufacturing a rising member.

FIG. 5 is a vertical sectional view showing a third embodiment for manufacturing a rising member.

FIG. 6 is a perspective view in which conventional rising members are provided facing each other.

[Explanation of symbols]

 1 PC block foundation 2 PC footing member 3 PC block PC rising member 4 Recessed part 5,5A, 5B, 5C Main body 6,6A, 6B, 6C Attached part 24 Support member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-96615 (JP, A) JP-A-61-162636 (JP, A) Jikkoku 52-53373 (JP, Y2)

Claims (2)

(57) [Claims] 1. A method of manufacturing a precast concrete block for a foundation of a building, wherein the end portions connected to each other have a recess portion that opens toward the outer end, and the precast concrete block for a foundation of a building has a U-shape in plan view. The part is formed of a main body and an auxiliary part that are arranged to face each other with the recessed part in between, and the auxiliary part is pre-manufactured and then, when the main body is manufactured, is arranged on the upper surface side of the mold for manufacturing the main body. Thickness
Support member having a flat dimension equal to that of the recess
Supported fixed to the present body, method for manufacturing a foundation for precast concrete block building, characterized in that it is integrated with the body. 2. A method for manufacturing a precast concrete block for a foundation of a building, the end portions of which are connected to each other and which have a recessed portion that opens toward the outer end and have a U-shape in plan view, wherein the end portion of the precast concrete block is A precast concrete for a building foundation, characterized in that the main body and an ancillary section, which are opposed to each other with the hollow section sandwiched therebetween, are formed separately, and the main body and the ancillary section are connected to integrate the two. Block manufacturing method.