JPH02308011A - Installation spacer of precast concrete continuous footing - Google Patents

Abstract

PURPOSE:To easily and accurately adjust the height of the top face of a beam member, by screwing adjusting bolts at female screw part provided in a supporting member to support the beam and gradually lifting the supporting member. CONSTITUTION:A base plat 2 is placed on a foundation floor 32 and a supporting member 3 having a couple of protrusions 10, 10 is placed on the base plate. Next, a PC concrete beam is installed between both protrusions 10, 10 of the supporting member 3 and press-fitting members 11, 11 are forced to insert into the space between the both sides of the supporting member and the both protrusions 10, 10. Next, adjusting bolts 5, 5 in contact with the base plate 2 at the bottom thereof are screwed in female screw members 4, 4 equipped at the supporting member 3 to adjust the downward protruded length. The distance between the foundation floor 32 and the bottom of beam member 31 is adjusted to control the height of the upper face of the beam member 31 by gradually lifting the supporting member 3.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention uses a precast concrete beam member (hereinafter referred to as a PC concrete beam member) when constructing a cloth foundation.

) This relates to an installation spacer that supports the lower end surface of the construction floor by raising it above the construction floor.

[Prior Art] The most common method for constructing a cloth foundation is to assemble formwork on site and pour concrete, but this method suffers from low product precision and large variations in quality.

Therefore, in order to solve the above problem, a PC concrete cloth foundation member with an integrated beam part and footing part was manufactured at a factory, and after placing a plurality of said PC concrete cloth foundation members on the construction floor at the site. , the installation method of joining them together has become popular. Here, the construction floor refers to the surface on which the PC concrete cloth foundation members are placed, and is usually the top surface of chestnut stone or gravel scattered at the bottom of the root cut, or the top surface of discarded concrete.
In some cases, the root cut bottom becomes the construction floor as it is (the same applies throughout this specification). However, this one-piece PC concrete fabric foundation member is heavy and therefore difficult to transport and handle.

Therefore, recently, by manufacturing a PC concrete beam member with only the beam part in a factory and placing the PC concrete beam member on the construction floor via a spacer, the lower end surface of the PC concrete beam member is raised from the construction floor. An installation method has also come to be used in which a footing is formed by floating and supporting the beam member and pouring concrete or mortar from the construction floor to the lower part of the beam member.

Conventional spacers often consist of a support part of a certain height that supports the lower end surface of a PC concrete beam member, and a clamping part that pinches both sides of the beam member. When the beam member is placed, the distance between the construction floor and the lower end surface of the beam member, and ultimately the height of the upper end surface of the cloth foundation are determined as is.

[Problems to be Solved by the Invention] However, as mentioned above, the construction floor is formed by scattering chestnut stones, etc. at the bottom of the root cut, so it is difficult to obtain an accurate height, and there is also uneven digging of the root cut and unevenness in the chestnut stones, etc. It also has undulations. Therefore, when a PC concrete beam member is placed on the spacer, it is affected by the construction floor, making it difficult to accurately adjust the height of the upper end surface of the cloth foundation.

An object of the present invention is to provide a novel spacer for installing a PC concrete cloth foundation, which allows the height of the upper end surface of the cloth foundation to be easily and accurately adjusted depending on the site.

[Means for Solving the Problems] In order to achieve the above object, the spacer for installing a PC concrete cloth foundation according to claim 1 includes a bottom plate placed on a construction floor, and a spacer placed on the bottom plate. It consists of a support member that supports the lower end surface of a PC concrete beam member, a female thread member provided on the support member, and an adjustment bolt that is screwed into the female thread member and whose lower end abuts the bottom plate.

Furthermore, in the spacer for installing a cloth foundation according to claim 2,
A pair of protrusions sandwiching both sides of the PC concrete beam member with a gap were provided on the support member, and a press-fitting member was provided to be press-fitted between both the protrusions and both sides of the PC concrete beam member.

[Function] According to the installation spacer of claim 1, by placing the PC concrete beam member on the support member, screwing in the adjustment bolt and gradually lifting the support member, the construction floor and the PC are connected.
The height of the upper end surface of the concrete beam member can be adjusted by changing the distance from the lower end surface of the concrete beam member depending on the site.

Furthermore, according to the spacer for installing a cloth foundation according to claim 2, P
By press-fitting a press-fitting member between the C concrete beam member and the convex portion, it is possible to clamp the lower end of the beam member without wobbling and adjust the position in the orthogonal direction.

[First Example] A first example of a spacer for installing a PC concrete cloth foundation embodying the present invention will be described with reference to FIGS. 1 to 5.

The installation spacer 1 of this embodiment supports the ends of two PC concrete beam members 31 installed adjacently, and its basic configuration is that it is placed on a construction floor 32 at the installation site. a bottom plate 2; and a support member 3 placed on the bottom plate 2 and supporting the lower end surface of the PC concrete beam member 31;
, a female screw member 4 provided on the support member 3, and an adjustment bolt 5 which is screwed onto the female screw member 4 and whose lower end abuts the bottom plate 2. As mentioned above, there are various cases regarding the construction floor 32, but in this embodiment, the root cut bottom 33
A construction floor 32 formed by laying chestnut stone 34 is shown as an example. Further, in this specification, the length direction of the two PC concrete beam members 31 is simply referred to as a longitudinal direction, and similarly, the plate thickness direction is referred to as an orthogonal direction.

The floor plate 2 is made of a hard plate such as a metal plate or a concrete plate (in this embodiment, an iron plate) that is flat and does not easily deform, and is placed on a chestnut stone 34 of a construction floor 32 in this embodiment.

The support member 3 is composed of two block bodies 6 that respectively support two PC concrete beam members 31 and a connecting body 7 that connects them, and these are integrally molded from concrete or mortar. A flat receiving surface 8 for receiving the lower end surface of the PC concrete beam member 31 is provided on the upper surface of each block body 6, and a flat receiving surface 8 is provided at the center of the receiving surface 8 to allow the foundation reinforcing bars 35 extending in the length direction to escape. A relief recess 9 is formed. P on both sides and longitudinal ends of the receiving surface 8
A pair of protrusions 10 sandwiching both side surfaces of the C concrete beam member 31 with a gap ' are integrally provided, and the inner walls of the protrusions 10 are inclined. A wedge-shaped press-fit member 1 is provided between these convex portions 10 and both sides of the PC concrete beam member 31.
1 is press-fitted to clamp the lower end of the PC concrete beam member 31 so that it does not wobble, and to enable position adjustment in the orthogonal direction. A pair of extension parts 12 are integrally provided on both sides of the convex part 10, and an insertion hole 20 through which the adjustment bolt 4 passes is vertically formed in the extension parts 12.

As shown in FIGS. 1 and 3, the female thread member 4 is embedded in the lower surface of the extension portion 12 so as to be continuous with the insertion hole 20, and in this embodiment, the female thread member 4 has a female thread cut on the inner periphery. A conical member is used.

The adjustment bolt 5 is inserted into the female threaded member 4 through the insertion hole 20.
It is screwed together so that it can move up and down and back and forth, and further protrudes downward to come into contact with the upper surface of the bottom plate 2.

Next, a method for installing a PC concrete cloth foundation using the installation spacer 1 will be explained according to a general process order.

(2) Place the bottom plate 2 on the construction floor 32, and place the support member 3 on top of the bottom plate 2. The foundation reinforcing bars 35 are routed in the length direction, and the portions that touch the support members 3 are arranged in the relief recesses 9.

■ Lift up the two PC concrete beam members 31 one after another and place them on the receiving surface 8 of the support member 3, and
A press-fitting member 11 is press-fitted between the beam member 31 and the convex portion 10 to clamp the lower end of the beam member 31 so that it does not wobble, and to adjust the position in the orthogonal direction.

In addition, by screwing the adjustment bolt 5 into the female thread member 4 and changing the downward protrusion length, the support member 3 is gradually lifted, and the distance between the construction floor 32 and the lower end surface of the PC concrete beam member 31 is adjusted. The height of the upper end surface of the beam member 31 is accurately adjusted by changing the height according to the undulating state of the floor 32.

(2) The protruding reinforcing bars 36 that protrude downward from the PC concrete beam member 31 and the foundation reinforcing bars 35 are fixed by binding or welding. Furthermore, the joining metal fittings 37 fixed to the butt end faces of both PC concrete beam members 31 are fixed by welding together.

(2) A footing portion 38 is formed by pouring concrete or mortar from the construction floor 32 to the lower part of the PC concrete beam member 31.

Further, by pouring concrete or mortar between the butted end faces of both PC concrete beam members 31, installation of the cloth foundation is completed.

As described above, according to the installation spacer 1 of this embodiment, the distance between the construction floor 32 and the lower end surface of the PC concrete beam member 31 can be changed depending on the site, and the height of the upper end surface of the cloth foundation can be adjusted accurately and easily. Can be adjusted.

Note that this installation spacer 1 is a so-called T shown in FIG.
It can also be used as a spacer for joints. That is, the center part of the PC concrete beam member 31 is placed across the receiving surfaces 8 of the two block bodies 6, and the ends of another PC concrete beam member 31 are placed on the side edges of both water receiving surfaces 8. Place both PC concrete beam members 31 side by side.
It is used when connecting two parts in a planar T-shape. Furthermore, the present spacer 1 can also be used as a spacer for a planar cross-shaped PC concrete beam member (not shown), and the above-mentioned effects can be achieved even when used in these cases.

[Second embodiment] Installation spacer 13 of the second embodiment shown in FIGS. 6 to 8
This embodiment has the same basic structure as the first embodiment, but is different in the specific aspects of each member.

That is, in this installation spacer 13, a concrete plate is used as the bottom plate 2, and a channel steel material that separately supports the two PC concrete beam members 31 is used as the support member 3.

Further, as the female thread member 4, a hexagonal nut welded to the lower surface of the channel steel material is used.

Further, at both ends of the two channel steel members, connecting members 14 having a substantially U-shaped cross section are provided to connect them and prevent them from falling down.
is removably fitted.

The installation method of the PC concrete cloth foundation using the above-mentioned installation spacer 13 is as follows.

(2) The bottom plate 2 is placed on the construction floor 32, and the two support members 3 are placed on the bottom plate 2 and connected by the connecting member 14. The foundation reinforcing bars 35 are routed in the length direction, and the portions that span the support members 3 are passed under them.

■ Place the two PC concrete beam members 31 on the support member 3, change the distance between the construction floor 32 and the lower end surface of the PC concrete beam member 31 according to the site, and accurately adjust the height of the upper end surface of the beam member 31. The method of adjustment is the same as in the first embodiment. However, in this embodiment, since the PC concrete beam member 31 is not clamped by the press-fit member 11, for example, as shown in FIG. Concrete beam member 3
It is necessary to support the upper end surface of 1.

■ After adjusting the height above, the P
A wedge member 40 made of concrete or mortar is driven into the gap between the C concrete beam member 31 and the floor plate 2 so that the PC concrete beam member 31 is supported by the wedge member 40, and the installation spacer 13 is removed and the next step is performed. Used repeatedly in construction.

■ The above-mentioned wedge member 40 is buried in the construction floor 32.
From the bottom of the PC concrete beam member 31! The footing portion 38 is formed by pouring concrete or mortar.

According to the installation spacer 13 of this embodiment as described above,
Effects similar to those of the first embodiment can be obtained with a simple configuration.

[Third Embodiment] Installation spacer 1 of the third embodiment shown in FIGS. 9 to 11
5 also has the same basic structure as the first embodiment, but is different in the specific aspects of each member.

That is, in this installation spacer 15, a concrete plate is used as the bottom plate 2, and the two support members 3 that separately support the two PC concrete beam members 31 are connected to the two support walls 16 at the bottom surface. It is composed of two connecting plates 17. A plate-shaped convex portion 18 is provided protrudingly on the support wall body 16, and a press-fitting member 11 is press-fitted between the convex portion 18 and the side surface of the PC concrete beam member 31. Further, as the female thread member 4, a hexagonal nut welded to the lower surface of the connecting plate 17 is used.

Furthermore, connection angles 19 are inserted into grooves formed at both ends of the support walls 16 of the two support members 3 to connect the support members 3 and prevent them from falling down.

The method of installing a cloth foundation using this installation spacer 15 is substantially the same as that of the second embodiment, and this embodiment can also achieve the same effects as the first embodiment with a simple configuration.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and may be embodied by making arbitrary changes within the scope of the invention, such as changing the shape, dimensions, or material of the bottom plate or supporting member as appropriate. You can also.

[Effects of the Invention] According to the spacer for installing a PC concrete cloth foundation according to the first aspect, the height of the upper end surface of the PC concrete beam member can be adjusted accurately and easily depending on the site.

Furthermore, according to the installation spacer of the second aspect, it is possible to easily clamp the lower end of the PC concrete beam member and adjust the position in the orthogonal direction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the first embodiment embodying the present invention, and FIG.
3 is a partially cut away side view, FIG. 4 is a perspective view, and FIG. 5 is a plan view of another usage. FIG. 6 is a front view of the second embodiment, FIG. 7 is a side view, and FIG. 8 is a perspective view. FIG. 9 is a front view of the third embodiment, FIG. 10 is a side view of the first embodiment, and FIG.
FIG. 1 is also a perspective view. 1.13.15... Installation spacer, 2... Bottom plate,
3... Support member, 4... Female thread member, 5... Adjustment bolt, 10.18... Convex portion, 31... PC concrete beam member, 32... Construction floor. Patent applicant Sekisui House Co., Ltd. Showa Concrete Kogyo Co., Ltd.

Claims (1)

[Claims] 1. An installation spacer that supports the lower end surface of a precast concrete beam member (31) by floating it above a construction floor (32), comprising: a floor plate (2) placed on the construction floor (32); , a support member (3) placed on the floor plate (2) and supporting the lower end surface of the precast concrete beam member (31);
Precast concrete composed of a female threaded member (4) provided on the support member (3) and an adjustment bolt (5) that is screwed into the female threaded member (4) and whose lower end abuts the bottom plate (2). Spacer for installing cloth foundations. 2. A pair of convex portions (10, 18) sandwiching both side surfaces of the precast concrete beam member (31) with a gap is provided on the support member (3), and both convex portions (10, 18) and the precast concrete The spacer for installing a precast concrete cloth foundation according to claim 1, further comprising a press-fitting member (11) press-fitted between both side surfaces of the beam member (31).