JPH03253618A - Method and apparatus for setting stopper in central hole of pile - Google Patents

Abstract

PURPOSE:To raise the efficiency of closing operation by a method in which an explainable synthetic resin in the resin container of upper opening set on a desired position of the center hole of pile is expanded and the center hole is closed with the resin coming from the upper opening. CONSTITUTION:The first and second expandible resin liquids 1 and 2 confined in a given amount in packing bags 3 are put in a resin container 4 with stirring, and the container 4 is inserted into the center hole of a prestressed concrete pile 11. The coupler 7 of each hanger 6 is set on the opening edge 11 of the pile 11 and the center hole of the pile 11 is closed with the spherical synthetic resin expanded to 15-20 times volume after ten minutes. The expanded synthetic resin stopper 12 is formed in the center hole of the pile 11 to form a concrete- receiving rack and both the resin liquids 1 and 2 are again mixed for forming a stopper to prevent falling-down. The upper end of the center hole of the pile 11 is closed with the resin 13 expanded spherically. The needs for welding operation or expanding operation of balloon can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and apparatus for plugging the center hole of a pile driven into the ground surface for supporting a superstructure.

<Prior art> Generally, a pile is a cylindrical prestressed concrete or steel pipe, with a central hole with a circular cross section passing through between the upper end face and the lower end face, and a steel plate of a driving shoe welded to the lower end face. The lower end opening of the center hole is closed.

These piles are driven perpendicularly into the ground surface, with the rest of the pile buried in the ground except for the top end of the pile, with the pile cap protruding above the ground and exposed.

After the pile is driven, in order to prevent people or objects from falling into the center hole that opens on the upper end of the pile exposed above the ground,
Close the upper end opening of the center hole.

The opening at the upper end of the center hole of the pile is closed by welding a steel plate to the upper end surface of the pile.

After that, when constructing the footing foundation that connects the pile and the superstructure, remove the fall prevention steel plate welded to the top end of the pile, open the top opening of the center hole of the pile, and insert the footing into the center hole of the pile. The receiver forms a shelf at a depth of about 1 m from the upper end surface,
For the support in the center hole of the pile, insert the lower part of the multiple connecting reinforcing bars into the shelf from the upper opening of the center hole of the pile, pour concrete, and fix the lower part of the connecting reinforcing bar to the top of the pile with concrete. do.

To form the above shelf, connect an air injection valve attached to a synthetic resin film balloon to the tip of the connection pipe of a foot-operated air pump placed on the ground, and place the balloon connected to the air pump at the center of the pile. Insert the balloon into the desired position in the hole, activate the foot-operated air pump on the ground, inject air into the balloon in the center hole of the pile, expand the diameter of the balloon, and force-fit the balloon into the center hole of the pile. After fixing the balloon to the desired position in the center hole of the pile, remove the connecting tube tip of the air pump from the balloon's air injection valve.

In addition, after a pile with an open bottom opening in the center hole is driven into the ground using the hollow hole method or rotary burying method, precautions should be taken to prevent mud, muddy water, cement milk, etc. from flowing out from the top opening in the center hole of the pile. , close the top of the center hole of the pile.

Closing the upper part of the center hole of this pile is similar to the case where the holder forms a shelf in a pile with the lower end opening of the center hole closed.A balloon is inflated inside the center hole of the pile, and the balloon is pressed into the center hole of the pile. fit.

<Problem to be solved by the invention> However, it is difficult to weld a steel plate to the top end of the pile to prevent it from falling.
Removing the iron plate requires a skilled welder and welding equipment, which takes a lot of time and effort.

Furthermore, when air is injected into a balloon in the center hole of a pile using a foot-operated air pump on the ground, and the balloon is inflated and press-fitted into the center hole of the pile, it takes time and effort to operate the single-foot type air pump. Moreover, balloons made of synthetic resin film may be damaged due to damage to the synthetic resin film or damage to the air injection valve.
Air often leaks out, so it takes a lot of effort to force-fit the balloon into the center hole of the stake.

After all, the operation of closing the desired position of the center hole of the pile requires a lot of effort and cannot be carried out efficiently.

An object of the present invention is to solve the conventional problems as described above.

Means for Solving the Problems> The present inventor focused on the fact that 1. When a foamed synthetic resin liquid is foamed, it expands and significantly increases in volume, and then solidifies to become a porous foamed synthetic resin. I tried foaming a foamed synthetic resin liquid inside the center hole of the pile.

Then, the foamed synthetic resin liquid expanded and closed the center hole of the pile, and then solidified and adhered to the center hole of the pile, forming a plug of foamed synthetic resin in the center hole of the pile.

The stopper was made of porous synthetic resin foam and could be removed by cutting it with a knife.

The present invention was completed based on this experiment.

That is, in the present invention, a resin liquid container with an open top is placed at a desired position in the center hole of a pile, and the foamed synthetic resin liquid in the resin liquid container is foamed and expanded.
The foamed synthetic resin expanded from the top opening of the resin liquid container closes the center hole of the pile, and the foamed synthetic resin that closed the center hole of the pile is solidified and fixed to the center hole of the pile, and foam is formed in the center hole of the pile. This is a method of plugging the center hole of a pile, which is characterized by forming a synthetic resin plug.

Further, the present invention provides the following methods:
This is a device for plugging the center hole of a pile, which is characterized by comprising a resin liquid container with an open top surface and a foamed synthetic resin liquid that is poured into the resin liquid container and expands and solidifies.

Function> In the method of plugging the center hole of a pile according to the present invention, a resin liquid container is placed at a desired position in the center hole of the pile, and the foamed synthetic resin liquid in the resin liquid container is foamed and expanded. When solidified, a foamed synthetic resin plug is formed in the center hole of the pile.

In the apparatus for plugging the center hole of a pile according to the present invention, a resin liquid container is placed at a desired position in the center hole of the pile, and the foamed synthetic resin liquid placed in the resin liquid container is foamed, expanded, and solidified. Then, a foamed synthetic resin plug is formed in the center hole of the pile.

When a foamed synthetic resin plug is formed at the upper end of the center hole of a pile driven into the ground, the plug serves as a fall prevention plug.

Note that this stopper can be removed by cutting it with a knife.

When a plug made of foamed synthetic resin is formed slightly below the upper end of the center hole of the pile driven into the ground, the plug serves as a shelf for the connecting reinforcing bars of the footing foundation and the concrete supports for fixing the reinforcing bars.

When a plug made of foamed synthetic resin is formed at the top of the center hole of a pile with an open bottom end that is driven into the ground using the Nakahori method or rotary burying method, the plug can be used to prevent muddy soil, muddy water, cement milk, etc. from flowing out. Become.

<Effects of the Invention> In the present invention, the center hole of the pile is plugged by foaming and solidifying the foamed synthetic resin, so unlike the conventional methods of welding iron plates or press-fitting balloons, there is no need for welding or inflating the balloons. It does not require any work and does not require much effort.

First Embodiment (See Figures 1 to 7)> The device for plugging the center hole of the pile in this example is as shown in the first factor, a foamed synthetic resin liquid 1.2 and a resin liquid container 4. and a hanging tool 6.

The foamed synthetic resin liquid contains a first resin containing incyanate as a main component.
It consists of a liquid 1 and a second liquid 2 whose main component is polyol, and when the first liquid 1 and the second liquid 2 are mixed, they foam, expand, and solidify to form porous polyurethane foam.

As shown in FIG. 1, predetermined amounts of the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid are respectively placed in a packaging bag 3 and sealed.

The packaging bag 3 is made of a composite sheet in which polyester film, aluminum foil, and polyethylene film are sequentially laminated.

As shown in FIG. 1, the resin liquid container 4 is a pot-shaped synthetic resin container with an open circular top surface and a plurality of hanging engagement holes 5 arranged at equal intervals around the top end. Penetrated in position.

As shown in FIG. 1, the hanging tool 6 is a plurality of wires having a desired length, and the upper and lower ends of each wire are formed into hook-shaped engaging portions 7, respectively.

When plugging the center hole of a pile using the above device, the lower end retaining part 7 of the hanging tool 6 is engaged with each suspension engagement hole 5 of the resin liquid container 4, and one foamed synthetic resin liquid is applied. 1st liquid 1 and 2nd liquid 2
The packaging bags 3 are torn open, the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid are put into the resin liquid container 4, and the first liquid 1 and the second liquid 2 in the resin liquid container 4 are stirred. and mix.

Then, the foamed synthetic resin liquid l in the resin liquid container 4.

2 starts foaming.

After mixing the first liquid 1 and the second liquid 2 in the resin liquid container 4, as shown in FIG.
1 into the center hole of each hanging engagement hole 5 of the resin liquid container 4.
The upper end retaining part 7 of each hanging tool 6, which has been engaged with the lower end retaining part 7, is engaged with the upper end opening edge of the stake 11, and the resin liquid container 4 is placed at a depth of about 1 m from the upper end opening of the stake 11. Place it by hanging it.

The foamed synthetic resin liquid 1.2 in the resin liquid container 4 placed in the center hole of the pile 11 stops foaming and expands to about 15 to 20 times its volume after about 10 minutes from the start of foaming. However, as shown in FIG. 3, the center hole of the stake 11 is closed by the substantially spherical foamed synthetic resin 12 bulging from the upper opening of the resin liquid container 4.

The roughly spherical foamed synthetic resin 12 that has closed the center hole of the pile 11 solidifies and adheres to the center hole of the pile 11 about 5 minutes after the end of foaming.

That is, as shown in FIG. 3, a plug 12 made of porous polyurethane foam, that is, foamed synthetic resin, is formed at a depth of about 1 m from the upper end opening of the center hole of the pile 11, as shown in FIG.

When constructing a footing foundation that connects the pile 11 and the superstructure, this plug 12 serves as a shelf for the connecting reinforcing bars and the concrete for fixing the reinforcing bars.

After forming the stopper 12 for the shelf, the receiver forms a stopper for preventing falling, so again, as in the previous case, the lower end retaining part 7 of the hanging tool 6 is inserted into the hanging engagement hole 5 of the resin liquid container 4. , open the packaging bag 3 containing the first liquid 1 of the foamed synthetic resin liquid and the second liquid 2, put the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid into the resin liquid container 4, and The first liquid 1 and the second liquid 2 in the liquid container 4 are stirred and mixed.

Thereafter, as shown in FIG. 4, the resin liquid container 4 is inserted into the center hole of the stake 11, and the upper end retaining part 7 of the hanging tool 6, which has the lower end retaining part 7 engaged with the resin liquid container 4, is attached to the stake 11. The resin liquid container 4 is engaged with the upper end opening edge and is suspended and disposed at the upper end position of the center hole of the stake 11.

The foamed synthetic resin liquid 1.2 in the resin liquid container 4 expands to about 15 to 20 times its volume after 10 minutes of the foaming time, and as shown in FIG. The upper end of the center hole of the pile 11 is closed by the substantially spherical foamed synthetic resin 13 bulging from the opening.

A substantially spherical foamed synthetic resin 1 with the upper end of the center hole of the pile 11 closed.
3 solidifies after about 5 minutes of solidification time, and the pile 11
It is fixed to the upper end of the center hole.

That is, at the upper end of the center hole of the pile 11, as shown in FIG.
A plug 13 of foamed synthetic resin is formed.

This stopper 13 serves as a fall prevention stopper.

After that, when constructing the footing foundation that connects the pile 11 and the superstructure, the fall prevention stopper 13 is cut and removed with a knife, as shown in FIG. 7, as shown in FIG. Next, a footing foundation 16 is constructed by inserting connecting reinforcing bars 14 and reinforcing bar fixing concrete 15 on top of the shelf plug 12 in the center hole of the pile 11.

Second Embodiment (See Figure 8) The device for plugging the center hole of the pile in this example uses the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid and the resin liquid container 4, as in the previous example. However, unlike the previous example, instead of putting the first and second liquids 2 of the foamed synthetic resin liquid into each packaging bag 3, as shown in FIG. A batch of a batch was added to each tank 21.
Put it in 22.

As shown in FIG. 8, the 191st tank 21 and the second liquid 2 tank 22 are each connected with a pump 23 driven by high pressure air from a compressor, and one end of a hose 24 is connected to each pump 23. and connect the other ends of both hoses 24 to the injection gun 25 so that the injection starts from 725 to the first liquid l.
and the second liquid 2 are mixed in a desired ratio and then injected.

When plugging the center hole of a pile using the above device, engage the lower end retaining part of the suspension tool with the suspension engagement hole of the resin liquid container, and drive the empty resin liquid container into the ground surface. Insert the suspension tool into the center hole of the pile, engage the upper end retaining part of the hanging tool with the lower end retaining part engaged with the resin liquid container, and engage the upper end opening edge of the pile. Hang and place it in the desired position.

After that, in the empty resin liquid container placed at the desired position of the center hole of the pile, the tank 21 containing the first liquid 1 of the foamed composite resin liquid and the second
The first liquid 1 is supplied from the injection gun 25 connected to the liquid 2 tank 22.
and the second liquid 2 are mixed in a desired ratio and injected.

Then, the foamed synthetic resin liquid 1.2 in the resin liquid container is
It foams and expands in volume by about 15 to 20 times, and the center hole of the pile is closed by the roughly spherical foamed synthetic resin that bulges out from the upper opening of the resin container, as in the previous example.

The foamed synthetic resin that has closed the center hole of the pile solidifies and adheres to the center hole of the pile.

That is, a plug of foamed synthetic resin is formed at the desired position of the central hole of the pile, as in the previous example.

In this example, compared to the previous example, the first liquid 1 of the foamed synthetic resin liquid
and the trouble of tearing and opening each packaging bag 3 of the second liquid 2, and
It does not take much effort to mix the liquid 1 and the second armpit 2.

Furthermore, since the empty resin liquid container is placed in the center hole of the stake, the resin liquid container can be easily placed.

Therefore, it is convenient when plugging each layer at a site where a large number of piles have been driven.

In this example, the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid are
The discharge force of the pump 23 is used as the power to inject the foamed synthetic resin liquid, but the tank 21 for the first liquid 1 and the tank 22 for the second liquid 2 of the foamed synthetic resin liquid are filled with compressed gas, and both tanks 21 and 22 are filled with compressed gas.
．． Due to the expansion force of the compressed gas of 22, the 1st f & 1 and the 2nd
A configuration may also be adopted in which the liquid 2 is injected from the injection gun 25.

3rd Embodiment (See Figures 9 to 11) The device for plugging the center hole of the pile in this example is as follows: 2. Same as the first embodiment, 1. 2 liquid 2 and resin liquid container and hanging tool 6
Predetermined amounts of the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid are respectively placed in a packaging bag and sealed. The first packaging bag is configured to also serve as a resin liquid container.

The packaging bag 31 for the first liquid 1 of the foamed synthetic resin liquid is made of a composite sheet in which polyester film, aluminum foil, and polyethylene film are sequentially laminated, and is a horizontally long rectangular bag. Put it in, close the bag,
The first liquid 1 is sealed.

As shown in FIG. 9, this packaging bag 31 is configured to be opened by cutting along the upper side between the right side and the left side of a horizontally long rectangular bag, as shown in FIGS. 9 and 1O. In addition, on the front and rear sides of the bag directly below the expected cutting opening line 32, a hanging engaging part 33 consisting of a central part through which the end of the wire pierces and a reinforced peripheral part is formed, and the front side of the bag is A foldable bottom surface 34 is provided between the bottom side and the lower side of the rear side.

When plugging the center hole of a pile using the above device, unfold the foldable bottom 34 of the packaging bag 31 for the first foamed synthetic resin liquid 1, and align the packaging bag 31 with the planned cutting opening line 32. As shown in FIG. 11, the upper side of the packaging bag 31 is opened, and a wire is attached to each hanging engagement part 33 on the front and rear sides of the opening edge of the packaging bag 31. The hook-shaped lower end retaining portion 7 of the tool 6 is pierced and engaged.

Next, as shown in FIG. 11, the packaging bag 3 for the second liquid 2 of the foamed synthetic resin liquid is torn open, and the second liquid 2 in the packaging bag 3 is poured into the packaging bag 31 from the top opening of the packaging bag 31. The first liquid l in the packaging bag 31 and the second liquid l in the packaging bag 31 are stirred and mixed.

Thereafter, as in the first embodiment, the packaging bag 31 containing the resin liquid containing the first liquid 1 and the second liquid 2 of the foamed synthetic resin liquid is inserted into the center hole of the pile, and the lower end is inserted into the packaging bag 31. Engagement part 7
The upper end retaining portion 7 of the hanging tool 6 is engaged with the upper end opening edge of the stake, and the packaging bag 31 is suspended and arranged at a desired position in the center hole of the stake.

The foamed synthetic resin liquid 1.2 in the packaging bag 31 containing the resin liquid is
The foamed synthetic resin expands to about 15 to 20 times its volume, and the substantially spherical foamed synthetic resin bulges out from the top opening of the packaging bag 31, closing the center hole of the pile.

The foamed synthetic resin that has closed the center hole of the pile solidifies and adheres to the center hole of the pile.

That is, a plug made of foamed synthetic resin is formed at a desired position of the center hole of the pile, as in the first embodiment.

In this example, compared to the first embodiment, the packaging bag 31 for the first liquid 1 of the foamed synthetic resin liquid is also used as a resin liquid container, so the packaging bag is effectively used and a dedicated resin liquid container is not required. be.

In addition, instead of the packaging bag 31 for the first liquid 1 of the foamed synthetic resin liquid, the packaging bag 3 for the second liquid 2 may also be used as a resin liquid container.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a device for plugging the center hole of a pile according to a first embodiment of the present invention. FIGS. 2 and 3 are cross-sectional views of each step of forming a plug for a shelf in the same method of plugging the center hole of a pile. FIGS. 4 and 5 are cross-sectional views of each step of forming a fall prevention plug in the same method of plugging the center hole of a pile. FIG. 6 is a cross-sectional view of the fall prevention stopper being removed. FIG. 7 is a sectional view of the footing foundation constructed using the stopper of the shelf. FIG. 8 is a side view of a device for mixing and spraying a first liquid and a second liquid of foamed synthetic resin liquid in a device for plugging the center hole of a pile according to the second embodiment. FIG. 9 is a front view of a packaging bag for the first foamed synthetic resin liquid in the apparatus for plugging the center hole of a pile according to the third embodiment. FIG. 10 is a central vertical sectional view of the packaging bag. FIG. 11 is a perspective view of the step of mixing the second liquid into the packaging bag for the first liquid, which also serves as a resin liquid container, in the method of plugging the center hole of the pile in the same example. 2. First scoop of foamed synthetic resin liquid 2: Second armpit of foamed synthetic resin liquid 3: Packaging bag 4: Resin liquid container 6: Hanging tool 11: Pile 12: Foamed synthetic resin plug, receiver is shelf 13: Foamed Synthetic resin stopper, fall prevention stopper 21: Tank 22: Tank 25: Injection gun 31: Resin liquid container that also serves as a packaging bag 15 11)

Claims (1)

[Claims] 1. A resin liquid container with an open top is placed at a desired position in the center hole of the pile, and the foamed synthetic resin liquid in the resin liquid container is foamed and expanded;
The foamed synthetic resin expanded from the top opening of the resin liquid container closes the center hole of the pile, and the foamed synthetic resin that closed the center hole of the pile is solidified and fixed to the center hole of the pile, and foam is formed in the center hole of the pile. A method for plugging the center hole of a pile, which is characterized by forming a synthetic resin plug. 2. The foamed synthetic resin liquid consists of a first liquid and a second liquid, and foams when the first and second liquids are mixed. Before placing the resin liquid container at the desired position in the center hole of the pile. ,
2. The method of plugging the center hole of a pile according to claim 1, wherein the first and second foamed synthetic resin liquids are placed in a resin liquid container. 3 The foamed synthetic resin liquid consists of a first liquid and a second liquid.
When the liquid and the second liquid are mixed, it foams, and after placing the resin liquid container at the desired position in the center hole of the pile,
2. The method of plugging the center hole of a pile according to claim 1, wherein the first and second foamed synthetic resin liquids are placed in a resin liquid container. 4. A center hole of a pile, which is characterized by comprising a resin liquid container with an open top surface, which is placed at a desired position in the center hole of the pile, and a foamed synthetic resin liquid that is placed in the resin liquid container and is foamed, expanded, and solidified. A device for plugging. 5 The foamed synthetic resin liquid consists of a first liquid and a second liquid.
A plug is inserted into the central hole of the pile according to claim 4, wherein the liquid and the second liquid are foamed when mixed, and the first liquid and the second liquid of the foamed synthetic resin liquid are each placed in a packaging bag. A device that does 6 The foamed synthetic resin liquid consists of a first liquid and a second liquid.
When the liquid and the second liquid are mixed, it foams, and the first and second foamed synthetic resin liquids are placed in tanks, and injection guns are connected to the first and second liquid tanks. 5. The apparatus for plugging the center hole of a pile according to claim 4, wherein the first liquid and the second liquid are mixed in a desired ratio and injected from the injection gun. 7. Claim 5, characterized in that the packaging bag for the first liquid or the packaging bag for the second liquid of the foamed synthetic resin liquid is configured to double as a resin liquid container placed at a desired position in the center hole of the pile. A device that plugs the center hole of the pile described above. 8. Claims 4 and 5, characterized in that the resin solution container includes a hanging tool for suspending the resin liquid container from the upper end of the center hole of the pile to a desired depth position.
A device for plugging the center hole of the pile according to , 6 or 7.