JPH0913389A - Precast continuous footing unit and precast continuous footing and constructing method thereof - Google Patents

Abstract

PURPOSE: To shorten an operating time required for connecting a unit, and to stabilize the dimensional accuracy of the whole continuous footing and the flatness of a top face on the high quality side by dividing the unit into specified size, on which a car can be loaded, and burying connectors to parting faces. CONSTITUTION: A continuous footing is divided into three units A, B, C. The unit A has a long side a1 L-shaped bent sections a2 , a3 , short sides a4 , a5 and a box-shaped section a6 , and the front end faces of the short sides a4 , a5 are used as joint surfaces with the unit B. The unit B has a long side b1 , T-shaped crossed sections b2 , b3 and a central short side b7 , and both end faces of the short sides b4 , b5 and the central short side b7 are employed as joint surfaces with the unit A and the unit C. The unit C has a long side, L-shaped crossed sections c2 , c3 , a T-shaped crossed section c4 and a central short side c7 , and each end face of the short sides c5 , c6 and the central short side c7 are used as the joint surface of the unit B. End faces brought into contact at the time of connection and opened surfaces are exposed and residual surfaces are buried to the units in connectors buried to the end faces of the units.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth foundation for buildings such as houses. More specifically, it is a precast cloth foundation unit and a precast cloth foundation unit completed by connecting precast cloth foundations manufactured in a factory in advance. About the foundation and how to build it.

[0002]

2. Description of the Related Art A cloth foundation is a foundation for wooden construction, etc.
It refers to a concrete structure that is continuous in a strip shape with an inverted T-shaped cross section, and is also called a continuous footing foundation. The construction method that has been used for a long time is to lay a split stone or a frame stone at the place where the ground foundation is to be constructed, and assemble a concrete frame with a plate.
It takes a lot of labor and time to assemble the frame because the concrete was poured into the frame and the building work on the foundation took place after the concrete hardened. There was a drawback that required.

On the other hand, cloth foundations having various patterns, such as L-shaped blocks, T-shaped blocks, cruciform blocks, and linear blocks, are precast in a factory and these concrete blocks are produced on site. A method of selectively constructing a cloth foundation having a desired pattern has been proposed (JP-A-59-165737 and JP-A-61-38028).

However, this prior art has the advantage that it does not require a frame and does not require a concrete curing period on site, but on the other hand, since there are many connecting points between blocks, a large number of connecting tools and a great deal of labor are required. There are drawbacks.

[0005]

An object of the present invention is to increase the dimensional accuracy and strength of the cloth foundation as a whole and to reduce the site work as much as possible. The purpose of the present invention is to provide a precast cloth foundation and a method of constructing the precast cloth foundation that are as small as 2 to 4 pieces.

[0006] Another object of the present invention is a connecting means capable of maintaining high quality for many years without reducing the dimensional accuracy and strength of the rolled portion of the precast cloth foundation, and without deterioration even when exposed to wind and rain. Is to provide a precast fabric foundation with.

[0007]

The precast cloth foundation unit of the present invention manufactured in a factory to achieve the above object is divided into a size (about 2 m × 9 m) which can be loaded on a vehicle, and
It is characterized in that a connecting tool is embedded in the divided surface. It is preferable that the connecting tool is one member of the pair of fixing tools and is pre-welded to the reinforcing bar embedded in the precast cloth base unit.

In the precast cloth foundation of the present invention, the joint surface of the cloth base unit is adhered, and the joints of the joint surface are connected using a connecting device, and then the recess is filled with a filler to form a concave shape. It has a structure that fills the space and shuts off the connecting metal fittings from the outside air.

The method of constructing a precast cloth foundation according to the present invention is a factory in which a precast cloth foundation unit is divided into a size (about 2 m × 9 m) that can be loaded on a vehicle, and a connecting tool is embedded in the divided surface. It is characterized in that it has a step of manufacturing, a step of placing waste concrete with a horizontal upper surface at a place where a cloth foundation is laid at a construction site, and a step of connecting the bonded divided surfaces with a connecting device. After each of these steps is completed, it is preferable to fill the recess of the connecting portion with a filler such as plastic to fill the recess and to shield the connecting fitting from the outside air.

In the present invention, "the size that can be loaded in a vehicle" means, for example, the size of a 10-ton truck bed is 2 m.
The size is about 9 m, which is close to the loading limit of such a large vehicle, and does not include a block member of about 1 m or less. If it is forcibly expressed by a numerical value, it can be limited to "the range of the long side of 5 m or more and 12 m or less". Also,
It can be limited to "a plurality of L-shaped bent portions, T-shaped intersecting portions, and cross-shaped intersecting portions, preferably three or more."

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a perspective view of an example of a cloth foundation simplified for explaining the present invention, and FIG. 2 shows a state in which the cloth foundation is divided into three units A, B and C. However, FIG.
In FIG. 2, illustration of the joining device of the joining surface is omitted.

The unit A has a straight long side a1, L-shaped bent portions a2 and a3 at both ends thereof, two short sides a4 and a5 perpendicular to the long side a1, and a central portion of the long side a1. It is provided with a box-shaped part a6 attached thereto, and the tip surfaces of the two short sides a4, a5 are joint surfaces with the unit B. Unit B is
A long side b1 parallel to the long side a1, T-shaped intersections b2 and b3 at both ends thereof, two short sides b4 and b5 including the T-shaped intersections b2 and b3 and perpendicular to the long side b1, and a long side Side b1
Is provided with a T-shaped intersection b6 at the center and a central short side b7 branched therefrom. Both end surfaces of the two short sides b4, b5 and the central short side b7 are joint surfaces of the unit A and the unit C.

The unit C has a long side c1 parallel to the long side a1.
And T-shaped intersections c2 and c3 at both ends and T at the center
The cross-shaped part c4 and the two short sides c5 perpendicular to the long side c1,
Central short side c7 diverging from c6 and T-shaped intersection c4
And each end face of the two short sides b5 and b6 and the central short side c7.
The end surface of is a joint surface with the unit B.

FIG. 3 shows a central longitudinal sectional view of an embodiment of the joining device for joining surfaces, FIG. 4 shows an exploded perspective view of the joining device, and FIG. 5 shows one of the precast cloth foundations shown in FIG. The end perspective view of unit 1A is shown.

The connecting tool 2 embedded in the end surface of the precast cloth base unit 1A has a box shape with one surface open,
The end surface 21 that contacts when connected and the opening surface 22 are exposed, and the remaining surface is embedded in the unit 1A. End face 21
A U-shaped opening 23 opened to the opening surface 22 is cut out, and a bolt / nut 24 is inserted into this opening 23 to connect the connecting tools 2 and 2. A joint 26 projects rearward from a rear surface 25 facing the end face 21, and the joint 26 is welded to the reinforcing bar 5 embedded in the unit 1. This welding operation is performed before precasting the concrete. The connecting tool 2 is embedded at a position where the opening surface 22 of the connecting tool 2 is retracted inward from the surface of the unit 1A. Therefore, a step 27 is formed between the opening surface 22 and the surface 1a of the unit 1A.

FIG. 6 shows a central longitudinal sectional view of another embodiment of the joining surface connecting device, FIG. 7 shows an exploded perspective view of the connecting device, and FIG. 8 shows one precast cloth foundation of FIG. The end perspective view of unit 1B is shown.

On the end face of the precast cloth base unit 1B, a recess 31 for receiving half of the intermediate fitting 3 is formed,
The bottom surface 32 of the recess is parallel to the end surface 1b of the unit 1B. The connector 4 embedded in the unit 1 is an insert nut type member, and its axial direction is parallel to the longitudinal direction of the unit 1B. Only the nut surface 33 of the connector 4 is exposed on the bottom surface 32 of the recess, and the distal end portion 34 at the back is welded to the reinforcing bar 5 embedded in the unit. Protrusions 35 are formed on the side surfaces of the connecting tool 4 to prevent them from coming out of the concrete. The intermediate metal fitting 3 has a box shape with one surface open, and has through holes 38, 38 for passing the bolt 37 through the both end surfaces 36, 36. Next, an example of the construction method of the present invention will be described.

On the ground of the cloth foundation laying site at the construction site, as shown in FIG.
As shown in (A), a trapezoidal groove 41 is dug, a crushed stone or crushed stone 42 is laid on the bottom of the groove 41, and crushed gravel 43 is filled in the gap and then hardened with a rammer or the like (B). Next, FIG.
As shown in (C), the concrete 44 is thrown out on it and the concrete surface is finished to a horizontal surface by using a level meter such as a communicating pipe. Since this discarded concrete 44 has a small thickness and a small amount of water content, it solidifies in a short time. The precast cloth foundation unit 1 illustrated in FIG. 2 is installed on the upper surface of the discarded concrete 44 as shown in FIG.

As shown in FIG. 3, the connecting and joining surface of each unit is connected to both connecting members 2, 2 by bolts and nuts 24.
After connecting, the periphery of the T-shaped joint surface of the units 1 and 1 is sealed with gum tape or an adhesive, and while evacuating from one end of the joint surface, the adhesive is press-fitted from the other end to fill the entire joint surface with the adhesive. . To facilitate the press fit of this adhesive,
A slight gap may be provided on the joint surface, and the bolt / nut 24 may be fully tightened after the adhesive is filled. The adhesive is preferably a slow-drying adhesive such as a caulking agent. After the bolts and nuts 24 are fully tightened, an adhesive such as a caulking agent is filled in the recesses of the connectors 2 and 2 where the bolts and nuts are exposed. By this filling work, the metal fittings are shielded from the outside air, and rust does not occur for many years without deterioration. In this way, a plurality of units are integrated to obtain the same cloth foundation as one concrete skeleton. After that, the groove 41 is backfilled with earth and sand 45 if necessary.

According to the present invention, the height of the cloth base unit 1 to be precast can be manufactured with high precision, so that the upper surface of the discarded concrete 44 is finished to be a horizontal surface, so that the joint surface of the cloth base unit 1 is The levels inevitably match and there is no step. Nevertheless, the following level adjusting means can be used together when it is desired to ensure the levels of the joint surfaces.

FIG. 10 shows a central longitudinal sectional view of the embodiment, and FIG. 11 shows an end perspective view of the unit 1C. The connecting device is omitted in FIGS. 10 and 11. On the upper surface 1d of the unit 1C, a rectangular recess 51 that opens to the joint surface 1b.
Are formed. The bottom surface 52 of this recess 51 is the top surface 1d.
The insert nut 5 is parallel to the bottom surface 52 of the recess.
3,53 are buried in advance. Also, the upper surface 1d
The depth h from the bottom of the recess 52 to the bottom 52 of the recess is manufactured with high precision in common to each unit. Bolts 55, 55 are fitted to the insert nuts 53, 53.

When connecting the cloth base unit 1C, first, an adhesive is applied to the joint surfaces to join them, and the bottom surfaces 52, 52 of the recesses are joined together.
The iron plate 54 for adjustment is applied to the upper part, and the iron plate 54 is firmly fastened to the unit 1C by the bolts 55, 55. Then, the fastener of the connecting device (see FIGS. 4 and 7) is tightened. Finally,
Filler 5b is provided in the recesses 51, 51 together with the recess of the connecting device.
Fill. According to this level adjusting means, the unit 1
Since the depth h of the recess 51 is significantly smaller than the height H of C, the unit upper surface 1d can be set easily and with high accuracy.

FIG. 12 shows a case where this adjusting means is applied to the ends 1e, 1e of the cloth base unit 1D lacking the T-shaped vertical portion as shown in FIG. 1F. FIG.
Since it is the same as, the description will be omitted.

[0024]

According to the present invention, since the precast cloth foundation is divided into a small number of units of 2 to 4 and each unit is manufactured at the factory, the work time required for connecting the units on site is reduced by the conventional block. It is shorter than that of the formula, and the dimensional accuracy of the entire cloth foundation and the flatness of the upper surface are stable on the high quality side.

By mounting the unit joint surface, the capillary phenomenon of water rising from the ground or containing water along the gap between the joint surfaces is eliminated, and rust of the connecting metal fitting is prevented. Similarly, by filling the recessed portion of the connecting portion with the filler, the connecting fitting is blocked from the outside world and rust is prevented. As a result, the durability of the connecting portion is improved.

Further, since the reinforcing bars embedded in the precast cloth foundation unit and the metal objects welded to each other are connected by a connecting device, a tensile load does not act on the concrete portion, and a conventional temporary frame is provided to provide on-site inspection. Similar to the method of placing ready-mixed concrete, it is possible to obtain a cloth foundation that is strong against earthquakes by utilizing the tensile stress of reinforcing bars.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a simple embodiment of a cloth foundation of the present invention.

FIG. 2 is a perspective view showing an example of division of the cloth base unit shown in FIG.

FIG. 3 is a central longitudinal sectional view of an embodiment of the connecting device of the present invention.

4 is an exploded perspective view of the coupling device of FIG.

5 is an end perspective view of one cloth base unit 1A of FIG. 3. FIG.

FIG. 6 is a central cross-sectional view of another embodiment of the coupling device of the present invention.

FIG. 7 is an exploded perspective view of the coupling device of FIG. 6.

FIG. 8 is an end perspective view of one cloth base unit 1B of FIG.

FIG. 9 is an explanatory view of an embodiment of the method of the present invention.

FIG. 10 is a central longitudinal sectional view showing an embodiment of the level adjusting means of the present invention.

11 is an end perspective view of one cloth base unit 1C of FIG.

FIG. 12 is a central longitudinal sectional view showing another embodiment of the level adjusting means of the present invention.

[Explanation of symbols]

A, B, C ... ・ Precast cloth foundation unit D, E, F, G, H ... ・ Splitting / connecting points of precast cloth foundation 1, 1A, 1B, 1C, 1D ... Precast cloth foundation Unit 2 ・ ・ ・ ・ Coupling tool (box type) 3 ・ ・ ・ ・ ・ ・ Intermediate metal fitting 4 ・ ・ ・ ・ Coupling tool (insert nut type) 5 ・ ・ ・ ・ Reinforcing bar 44 ・ ・ ・ ・ ・ ・ Waste concrete

Claims (5)

[Claims] 1. A size which can be loaded on a vehicle (2 m × 9 m)
The precast cloth foundation unit is characterized in that it is divided into two parts, and a connecting tool is embedded in the divided surface. 2. A size (2 m × 9 m) that can be loaded on a vehicle
A precast cloth base unit, characterized in that a plurality of precast cloth base units divided into sections are installed on abandoned concrete, and the joint surfaces of each precast cloth base unit are connected by connecting means. 3. The precast fabric base unit according to claim 2, wherein the connecting means comprises a bonding device for bonding the joining surfaces and a connecting device welded to a reinforcing bar embedded in the longitudinal direction in the precast fabric base unit. 4. A step of manufacturing a precast cloth foundation in a factory, which is divided into a size (about 2 m × 9 m) that can be loaded on a vehicle, and a connecting tool is embedded in the divided surface,
The step of placing abandoned concrete with a horizontal top surface at the place of laying a cloth foundation at the construction site, installing the above precast cloth foundation unit on the top surface of the abandoned concrete, and bonding the dividing surface with the bonded dividing surface A method for constructing a precast cloth foundation, comprising the step of connecting with a device. 5. A pre-cast cloth base unit is provided with a recess on an upper surface of a joint surface, the bottom surface of the recess is parallel to the upper surface, and one is provided on the recess of both units in a joined state. 3. The parallel metal fittings according to claim 2 are fixed.
Alternatively, the precast cloth foundation according to claim 3.