JP3027494B2 - Independent installation method of PC foundation and connecting jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-standing installation method of a precast concrete foundation for connecting precast concrete foundations to each other for self-supporting, and a connecting jig.

[0002]

2. Description of the Related Art In order to construct a building in a stable state, it is necessary to construct a foundation on the ground stably and accurately. Conventionally, a foundation part for a house firstly excavates the ground of a building construction part continuously to form a root cutting part, lays a cobblestone on this root cutting part, forms a formwork, and forms this mold through supporting means. The frame is erected and supported, and concrete is poured into the mold, cured and solidified, then the mold is removed and the surface is treated with mortar.

In the conventional foundation construction work, the work of continuously erecting the formwork along the root cutting portion is troublesome, leads to a longer construction period, and increases costs. In addition, work to cure concrete,
It requires several days, causing the construction period to be prolonged, and the removal of the mold and the mortar treatment were also troublesome.

In order to simplify and speed up the work of constructing a foundation at a construction site, a construction method in which a precast concrete (hereinafter, referred to as PC) foundation preliminarily manufactured at a factory stage is installed at a root cutting portion is considered. Was.

In this type of construction, when constructing a foundation that crosses in a cross shape, the PC foundation is installed in a cross shape and the intersection is fixed with concrete. Until the PC foundation is firmly connected, the installed PC foundation must be kept from falling down.

FIG. 6 is a perspective view showing a state where the PC base is supported so as not to fall down. In the figure, four PC bases 100 are installed in a cross shape on a bottom plate (not shown), and are supported by PC base supports 110. The PC base support 110 has a flat plate receiving portion 114 provided at both ends of a steel pole 112.
One receiving part 114 is brought into contact with the side of the PC base 100,
The PC base 100 is supported by placing the other receiving portion 114 in contact with the ground. The PC base supports 110 are respectively installed on both side surfaces of the PC base 100, and the PC base 10 is provided by vibration and impact during operation.
0 is prevented from falling.

[0007]

However, the above conventional P
When the C base support 110 is used, it is necessary to install the PC base support 110 on both sides of the installed PC base 100, and in order to support the PC base 100 in a stable state, many The PC base support 110 had to be installed. Also, this PC base support 110
Is made of steel or the like in order to obtain a sufficient strength, so that it is very heavy and places a burden on transportation and installation work. Furthermore, this PC basic support 11
No. 0 protrudes outward from the PC base 100 and is set up with a space, so that it is obstructive when performing subsequent work, and the work efficiency is reduced.

[0008] Alternatively, since a formwork is required when placing concrete in a portion where the foundation crosses in a cross shape, the PC
Instead of the foundation support, each PC foundation 1
00 can also be linked. In this case, first, all the four PC bases 100 are installed in a cross shape with a crane, and then the formwork is attached. Therefore, when installing the next PC base 100 next to the existing PC base 100,
When the formwork was attached, the PC base 100 was in an unsupported state, and the operator had to support it by hand. In this case, since the PC base 100 was heavy, it was difficult to support it manually.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object the purpose of building a cross-shaped foundation using a PC foundation by simply attaching it to one place and saving space. Another object of the present invention is to provide a self-standing installation method and a connecting jig for a PC base, which can be made relatively light and easy to handle, and can make this PC base independent each time the PC base is installed.

[0010]

In order to achieve the above object, an invention according to claim 1 is a method for self-standing installation of a precast concrete foundation when constructing the foundation by installing the precast concrete foundation in a cross shape. After the first precast concrete foundation is installed, a second precast concrete foundation is installed at right angles to the first precast concrete foundation , and the upper end faces of these first and second precast concrete foundations are cross-shaped.
Step of connecting with a plate-shaped connecting jig, installing a third precast concrete foundation , connecting the upper end surface of the third precast concrete foundation and the connecting jig, and forming the third precast concrete Connecting a foundation to the first and second precast concrete foundations, installing a fourth precast concrete foundation , connecting an upper end surface of the fourth precast concrete foundation and the connection jig, Connecting the fourth precast concrete foundation to the first, second, and third precast concrete foundations, and connecting the precast concrete foundations to each other so as to be self-supporting.

Further, the invention according to claim 2 is a self-standing installation method of the precast concrete foundation when the precast concrete foundation is installed in a cross shape and the foundation is constructed, wherein the method comprises the steps of: Installing a second precast concrete foundation at right angles to the first precast concrete foundation, connecting the first and second precast concrete foundations with a first connecting jig, and forming a third precast concrete foundation. Install and connect the second connecting jig to this third precast concrete foundation,
Connecting the second connecting jig to the first connecting jig and connecting the third precast concrete foundation to the first and second precast concrete foundations; and installing a fourth precast concrete foundation. Connecting the fourth precast concrete foundation and the second connecting jig to connect the fourth precast concrete foundation to the first, second and third precast concrete foundations. It is characterized by connecting each precast concrete foundation and making it independent.

Further, the invention according to claim 3 is the invention according to claim 1.
A jig for connecting a precast concrete foundation used in the above, in the form of a cross-shaped plate , can be connected to the upper end surface of each end of each precast concrete foundation installed in a cross, via a connecting means, The precast concrete foundations are formed so as to be connectable to each other.

[0013] The invention according to claim 4 is the invention according to claim 2.
A jig for connecting the precast concrete foundation used in the above, wherein the jig is formed so as to be connectable to an end of the first and second precast concrete foundations installed at right angles via a connecting means, and A first connecting jig having a connecting portion with a connecting jig, and an end of the third and fourth precast concrete foundations installed at right angles, formed so as to be connectable via connecting means, and A second connecting jig having a portion to be connected to the first connecting jig,
And by combining the first connection jig and the second connection jig, the precast concrete foundations are formed so as to be mutually connectable.

According to a fifth aspect of the present invention, in the third or fourth aspect, the connecting means includes an insert buried in an upper surface of an end portion of each precast concrete foundation, and a bolt screwed to the insert. And an adjusting jig which is formed so as to be able to adjust the position by inserting the bolt, clamping the bolt and the side end of the connecting jig, and pulling the precast concrete foundation.

[0015] Further, the invention according to claim 6 provides the invention according to claim 5.
Wherein the adjustment jig has a plurality of holes through which the bolts can be inserted, and is formed so as to be able to cope with a change in the burying position of the insert.

[0016]

According to the first aspect of the present invention, when the first PC base and the second PC base are installed and connected by the connecting jig, the two are installed at right angles, so that they are free standing so as not to fall down. I do. Then, when the third PC foundation is installed and coupled to the connecting jig, the third PC foundation is supported by the first and second PC foundations and becomes independent. Similarly, the fourth P
When the C foundation is installed and connected to the connecting jig, this fourth P
The C foundation is supported and independent by the first to third PC foundations. In this way, each PC foundation is mutually supported and independent.

In addition, according to the second aspect of the present invention, the connecting jig is divided into the first connecting jig and the second connecting jig, and these PC bases are connected. Therefore, after the first PC base and the second PC base are connected by the first connection jig, the work of installing the third PC base becomes easier. Then, when the second connecting jig is connected to the third PC base and the second connecting jig is connected to the first connecting jig, the third PC base becomes the first and second P jigs.
It is supported by C foundation and becomes independent. Furthermore, when the fourth PC foundation is installed, the work is not difficult if the connection between the second connecting jig and the first connecting jig is loosened. Then, the fourth PC base is installed and connected to the second connecting jig, and if this second connecting jig and the first connecting jig are firmly connected, the PC bases are mutually supported. And become independent.

Next, according to the third aspect of the present invention, each P
Since the PC bases can be connected to the ends of the C bases, the PC bases that are sequentially installed as described in claim 1 are connected each time they are installed, and the PC bases are interconnected. Can support and become independent.

According to the fourth aspect of the present invention, as described in the second aspect, the first PC base and the second PC
The first connection jig is used when connecting the base and the second connection jig is connected to the third PC base and the fourth PC base. Then, by connecting the first connecting jig and the second connecting jig, the PC bases can be connected to each other, supported, and made independent.

According to the fifth aspect of the present invention, since the insert in the connecting means is embedded in the upper surface of the side end of the PC base, the connecting jig is connected to the upper surface of the PC base. . In addition, the connection between the PC base and the connecting jig is performed using bolts, but since there is clearance in the holes through which the bolts are inserted, the bolts can be inserted even if the PC base is installed at a slightly shifted position. can do.
Therefore, in this case, an adjusting jig is used. That is, the bolt can be inserted into the adjusting jig, and the bolt can be clamped between the side ends of the connecting jig, and the PC base can be pulled to adjust the position.

According to the sixth aspect of the present invention, the PC
Since the position of the insert buried in the foundation may be symmetrical at both ends, or the position of this insert may vary depending on the thickness of the PC foundation, the adjusting jig is provided with a plurality of holes through which bolts can be inserted, It is possible to respond to changes in the burying position of the insert.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a cross-shaped foundation constructed by connecting four PC foundations. FIG. 1 shows a state in which a connecting jig 20 and the like for connecting each PC foundation 10 in FIG. 1 are removed. It is shown in FIG.

In FIG. 2, a PC foundation 10 is installed on a PC bottom 1 installed at a root cutting portion formed by digging the ground. The PC bottom 1 is provided with a concrete pouring opening 2 in the center, where concrete is poured and integrated with the ground.

As shown in FIG. 2, there are two types of PC bases 10 installed on the PC base 1, one having a long side end and the other having a short side end.
Is shown in FIG. FIG. 1A is a plan view, and FIG. 2B is a front view.

In FIG. 3, the PC base 11 is a substantially rectangular plate-like member, and is made of concrete with a reinforcing steel bar (not shown) embedded therein, which has been subjected to a surface treatment in advance at a factory. Has become. The upper end surface of the PC foundation 11 is formed flat so that a building can be constructed and supported, and cutouts 15 are formed at predetermined intervals to allow ventilation under the building. Also, on this upper end surface,
A plurality of inserts 16 are buried at both ends and an intermediate portion. The inserts 16 are used to screw bolts (not shown) having connecting portions to facilitate lifting the PC base 11 with a crane or the like. The insert 16 is also used to attach a connecting jig 20 for connecting to the adjacent PC base 10.

An end of the PC base 11 is connected to a built-in reinforcing bar (not shown) in a state
Are embedded in two places, and the ends of the double bars 17 project sideways in a U-shape (not shown). Further, a convex portion 18 protruding laterally is provided at a center side of the double streaks 17 for a predetermined distance, and a formwork (not shown) is attached to this convex portion 18 so as to be located at a position where the double streaks 17 are embedded. Concrete is cast and can be connected and fixed to the adjacent PC foundation 10. Further, both ends of the PC base 11 are chamfered.

Thus, the PC having a long side end in FIG.
The base 11 is formed as described above, while the PC base 10 having a short side end is as described above, except that the side end is short and the double streaks 17 are buried one at each end. It has the same configuration as.

When installing these PC bases 10 in a cross shape, as shown in FIG.
The C foundation 11 is set so that the side end enters the center of the cross, and the PC base 10 having a short side end is set at the remaining three places. In this way, a gap through which the connecting bar 19 passes can be formed by the PC foundation 10 having a short side end portion. When concrete for connecting and fixing the PC foundations 10 is cast, the connecting bar 19 is built into the concrete, and The side end of the long PC base 11 is hard to cast concrete, so that the PC bases 10 can be firmly integrated with each other.

Next, the connecting jig 20 for connecting the PC bases 10 for constructing the cross-shaped base will be described. The connecting jig 20 includes a first connecting jig 21 and a second connecting jig 22.

First, FIG. 4 is a perspective view showing the first connecting jig 21 and the second connecting jig 22, and these will be described with reference to FIG.

The first connecting jig 21 is a PC to be installed first.
A jig for connecting the base 11 and the second PC base 12 to be installed, and an adjusting jig guide 21b is provided on the connecting plate 21a.
And a reinforcing plate 21c and a bolt 21d.

The connecting plate 21a is formed so that each PC base 10 has a right angle L
It is a plate-shaped steel material formed in an L-shape because it is installed in the shape of a letter, and is a bolt insertion hole 2 for coupling with the PC base 10.
4 are formed at both ends of each four. As described above, a plurality of bolt insertion holes 24 are provided because a plurality of bolts
This is because it is possible to cope with a change in the burying position of the insert 16 of the PC foundation 10 as well as in the case of coupling with the C foundation 10. For example, as shown in FIG.
When the mounting position of the connecting bolt 50 on the base 11 and the connecting position of the connecting bolt 50 on the third PC base 13 are symmetrical, or the embedding position of the insert 16 is changed depending on the thickness of the PC base 10. When
If a plurality of bolt insertion holes 24 are formed, it is effective because it is not necessary to newly manufacture a bolt insertion hole 24 whose position is changed.

An adjusting jig guide 21b is provided adjacent to the bolt insertion hole 24 of the connecting plate 21a to form a slit 25 through which the adjusting jig 30 can be inserted and guided.

Further, at the corner of the connecting plate 21a,
A reinforcing plate 21c, which is a plate-like steel material, is superimposed for reinforcement, and a bolt 21d is provided upright on this upper surface. The reinforcing plate 21c may be omitted depending on the strength of the connecting plate 21a.

Next, the second connecting jig 22 has an L-shape in which a rectangular connecting plate 22a provided with a bolt insertion hole 24 and an adjusting jig guide 22b is connected in an L-shape by a connecting plate 22c. It is a member of. Here, the bolt insertion hole 24 and the adjustment jig guide 22b are the same as those of the first connection jig 21.

The second connecting jig 22 is connected to the connecting plate 2.
2a is not formed in an L-shape with one plate, but a pair of rectangular connecting plates 22a, 22a are connected by connecting plates 22c at upper end portions to form an L-shape. The facing end surface 26 is L-shaped and is guided by the L-shaped corner of the first connecting jig 21 so that a right angle can be easily obtained.

Further, the connecting plate 22c is provided with a connecting hole 28 through which the bolt 21d of the first connecting jig 21 can be inserted. As shown by an arrow in FIG. Bolt 21d is connected to the connection hole 28 of the second connection jig 22.
, And are positioned so as to draw a cross at a right angle, and the two can be connected by a nut 60 (see FIG. 1).

In this embodiment, the position of the PC base 10 can be adjusted by the adjusting jig 30 before connecting the PC bases 10 with the connecting jig 20. FIG. 5 is a view showing the adjustment jig 30. FIG. 5A is a plan view thereof, and FIG. 5B is a side view thereof.

This adjustment jig 30 adjusts the installation position of the PC foundation 10. That is, PC basic 10
As shown in FIG. 1, the connecting jig 20 is placed on the upper surface and the two are connected by a connecting bolt 50.
The 0 bolt insertion hole 24 is formed slightly larger so that the coupling bolt 50 can be easily inserted. Therefore, even if the installation position of the PC base 10 is slightly shifted, the coupling bolt 50 can be inserted, and the PC base 10 is connected with the installation position shifted in this state. Therefore, the installation position of the PC foundation 10 can be adjusted by the adjustment jig 30.

The adjusting jig 30 has a drawing plate 32, a drawing bolt 34, a pressure plate 36, and a handle 38.

The pulling plate 32 is of a size that can be inserted into the slit 25 of the connecting jig 20, and has a bolt insertion hole 24 formed at one end side, and
A connection bolt 50 for connecting the connection jig 20 to the connection jig 20 can be inserted therethrough. Note that a plurality of the bolt insertion holes 24 are formed similarly to the bolt insertion holes 24 of the connection jig 20. The other end of the drawer plate 32 is bent in an L-shape, and a nut 32a is welded and fixed to the other end. A pulling bolt 34 is screwed into the nut 32 a, and a crimping plate 36 is rotatably attached to a tip of the pulling bolt 34 inside the pulling plate 32, and is attached to a side end of the connecting jig 20. It can be crimped, and a handle 38 is attached to the opposite end. In this manner, when the handle 38 is turned, the crimping plate 36 moves in the axial direction of the drawing bolt 34, so that the bolt insertion hole 24
And the pressure plate 36 can be changed in distance.

Next, the auxiliary plate 40 is inserted into the slit 25 of the connecting jig 20 when the position of the PC base 10 is accurately set and there is no need to adjust the position. 30 has the same configuration as the distribution plate 32.

This embodiment is configured as described above, and the connection work of this PC base will be described below.

First, a first PC having a long side end shown in FIG.
The base 11 is set on the PC base 1, and the second PC base 12 is set at right angles to the base. Then, as shown in FIG. 1, the first connection jig 21 (see FIG. 4) is placed on the corners of the PC foundations 11 and 12, and the auxiliary plate 40 is inserted through the slit 25 of the first connection jig 21. , Auxiliary plate 40 and bolt insertion hole 24 of first connecting jig 21 (see FIGS. 4 and 5)
Then, the connecting bolt 50 is inserted into the insert 16 (see FIG. 3) of the first PC base 11, and the connecting bolt 50 is screwed and connected.

Next, on the second PC base 12 side, the adjusting jig 30 is inserted into the slit 25 of the first connecting jig 21, and the bolt inserting hole 24 (of the adjusting jig 30 and the first connecting jig 21). 4 and 5), insert the connecting bolt 50 and insert 16 of the second PC base 12 (see FIG. 3).
The connecting bolt 50 is screwed into the connector and left loose to some extent.

Here, FIG. 1 assumes that the second PC base 12 is slightly displaced. Then, when the handle 38 of the adjusting jig 30 is turned to clamp the connecting bolt 50 and the side end of the first connecting jig 21, the PC base 12 is pulled and moved in the direction indicated by the arrow in FIG. Position adjustment can be performed.

In this way, the second PC base 12 is set at the correct position, and when the connecting bolt 50 is further tightened,
The second PC base 12 is connected to the connecting jig 21 and is connected to the first PC base 11 already connected by the connecting jig 21. Then, since the first PC base 11 and the second PC base 12 are connected at a right angle, they are mutually supported and stand alone.

Next, a third PC base 13 is set facing the first PC base 11. And the second connecting jig 2
2 (see FIG. 4) is inserted into the connection hole 28 of the first connection jig 21.
Is placed on the first connecting jig 21 and the third PC base 13 while inserting the bolt 21d. Here, the second connecting jig 22 is guided at an L-shaped corner of the first connecting jig 21 so that a right angle can be easily obtained.

The bolt 21d of the first connecting jig 21
Are tightened with a nut 60, the auxiliary plate 40 is inserted into the slit 25 of the second connecting jig 22, and the second connecting jig 22 and the third PC base 13 are connected by the connecting bolt 50. Then, the third PC basic 13 becomes the first PC basic 11
And the second PC base 12 to be mutually supported and independent.

Next, the fourth PC base 14 is set so that its end is located below the second connecting jig 22. At this time, if the nut 60 connecting the first connection jig 21 and the second connection jig 22 is loosened, the operation of positioning the end of the fourth PC base 14 below the second connection jig 22 is performed. Can be easily performed. Then, the auxiliary plate 40 is inserted into the slit 25 of the second connecting jig 22, and the second connecting jig 22 and the fourth PC base 14 are connected by the connecting bolt 50. Then, the fourth PC basic 14 is composed of the first PC basic 11 and the second PC basic.
The base 12 and the third PC base 13 are connected to each other to be mutually supported and self-supporting.

As described above, the PC bases 10 are installed in a cross shape, and each is supported independently of each other,
Subsequent work can be easily performed.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, the PC bases 10 were connected using the first connection jig 21 and the second connection jig 22, however, the first connection jig 21 and the second connection jig 22
May be integrated into one jig. In this case, it is preferable that the jig is formed in the shape of a cross plate, and the jig is bent at the hinge so that the second and subsequent PC bases can be easily fixed.

In the above embodiment, the adjusting jig 30 or the auxiliary plate 40 is used when connecting the PC bases 10. However, the adjusting jig 30 and the auxiliary plate 40 are omitted, and the connecting jig is directly connected. 20 by inserting a connecting bolt 50 into each P
The connection with the C foundation 10 may be achieved.

[0055]

As described above, according to the first or third aspect of the present invention, when constructing a cross-shaped foundation using a PC foundation, this P
There is an effect that the C foundation can be made independent, the connecting jig does not take up space, and the structure can be made relatively light and easy to handle.

In addition, according to the second or fourth aspect of the present invention, since the connecting jig is divided into the first connecting jig and the second connecting jig, the PC bases are connected. This has the effect of making work easier.

Further, according to the fifth aspect of the present invention, the position of the PC base can be adjusted by the adjusting jig.

According to the invention described in claim 6, since the adjusting jig is provided with a plurality of holes through which bolts for coupling to the PC base can be inserted, it is possible to cope with a change in the insertion position of the insert. effective.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cross-shaped foundation according to the present embodiment.

FIG. 2 is a plan view showing a state where a connecting jig and the like are removed in FIG.

FIG. 3 shows a PC base, (1) is a plan view thereof, and (2).
Is a front view thereof.

FIG. 4 is a perspective view showing a connecting jig.

FIG. 5 shows an adjusting jig, (1) is a plan view thereof, and (2).
Is a side view thereof.

FIG. 6 is a perspective view showing a conventional method of supporting a PC foundation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 PC basic 11 first PC basic 12 second PC basic 13 third PC basic 14 fourth PC basic 16 insert 20 connecting jig 21 first connecting jig 22 second connecting jig 30 adjusting jig 50 Coupling bolt

Claims (6)

(57) [Claims] 1. Cross-shaped precast concrete foundation
Precast concrete when installing on a building
Self-supporting installation method of the foundation, and after installing the first precast concrete foundation,
At right angles to this first precast concrete foundation
Of precast concrete foundation
And second precast concrete foundationTop edge of
To, Cross plateConnect with connecting jig
Process and installing a third precast concrete foundation
Three precast concrete foundationsTop edge ofAnd the connection
Combine with the jig to make this third precast concrete
The first and second precast concrete concrete
Connecting a fourth precast concrete foundation,
Four precast concrete foundationsTop edge ofAnd the connection
Combine with the jig, and this fourth precast concrete
The first, second and third precast concrete
Connecting each precast concrete foundation to a cleat foundation.
Of precast concrete foundation
Independent installation method. 2. A method for self-standing installation of a precast concrete foundation when the precast concrete foundation is installed in a cross shape and constructing the foundation, wherein after the first precast concrete foundation is installed,
Installing a second precast concrete foundation at right angles to the first precast concrete foundation, connecting the first and second precast concrete foundations with a first connecting jig, and installing a third precast concrete foundation Then, a second connecting jig is connected to the third precast concrete foundation, and the second connecting jig is connected to the first connecting jig. Connecting to a second precast concrete foundation, installing a fourth precast concrete foundation, connecting the fourth precast concrete foundation and the second connection jig, and joining the fourth precast concrete foundation Connect to the first, second and third precast concrete foundations It includes a degree, a free standing installation method of precast concrete foundation, characterized in that to self by connecting each precast concrete foundation with each other. 3. The connecting jig for a precast concrete foundation used in claim 1, wherein the jig has a cross-shaped plate shape, and is provided on an upper end face of each end of each precast concrete foundation installed in a cross shape.
A connecting jig for a precast concrete foundation, wherein the jig can be connected to each other via a connecting means so that the precast concrete foundations can be connected to each other. 4. A jig for connecting a precast concrete foundation used in claim 2, wherein the jig can be connected to ends of the first and second precast concrete foundations installed at right angles via a connecting means. A first connecting jig formed and having a connecting portion with the second connecting jig, and connected to ends of the third and fourth precast concrete foundations installed at right angles via connecting means. And a second connecting jig having a portion to be connected to the first connecting jig, and, by connecting these first connecting jig and the second connecting jig, each precast A connection jig for a precast concrete foundation, which is formed so that the concrete foundations can be connected to each other. 5. The connecting means according to claim 3, wherein said connecting means includes an insert buried in an upper surface of an end portion of each precast concrete foundation, a bolt screwed to said insert, and said bolt inserted therethrough. An adjusting jig formed so as to adjust the position by pulling the precast concrete foundation by clamping the bolt and a side end of the connecting jig. 6. The precast according to claim 5, wherein the adjusting jig has a plurality of holes through which the bolts can be inserted, and is formed so as to be able to cope with a change in the burying position of the insert. Connection jig for concrete foundation.