JPH0417628Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a cylindrical casing for pile holes that fits into the upper end of the pile hole to prevent collapse of the pile hole during the construction of cast-in-place piles. be.

(Prior art) Conventionally, when constructing piles by casting on site, a pile hole is excavated and a cylindrical casing is fitted into the upper end of the pile hole. We are trying to protect it.

Further, after the pile hole is excavated, excavated soil and bentonite, which has replaced the excavated soil, remain in the pile hole, and this residue is discharged to the outside of the pile hole through the upper end hole of the cylindrical casing.

(Problem that the invention aims to solve) However, in the conventional method, the residue discharged from the upper hole of the cylindrical casing spreads and scatters around the pile hole, polluting the surrounding area and worsening the working environment. In addition, there is a problem in that cleaning work is required, which reduces work efficiency.

The basic purpose of this invention is to solve the above-mentioned problems, and to provide a cylindrical casing that can easily collect the waste from the pile hole and prevent the outside of the pile hole from being contaminated.

(Means for Solving the Problems) In order to achieve the above object, the cylindrical casing of this invention has a plurality of discharge holes formed in the upper side wall that protrudes above the ground surface when the pile hole is inserted. It is characterized in that a discharge passage is connected to the hole. Although the discharge passage is branched into a gutter shape on the side connected to the discharge hole, the structure is not limited to this.

(Operation of the invention) That is, according to this invention, the residue in the pile hole is discharged into the discharge passage from the discharge hole in the side wall of the casing that is fitted into the upper end of the pile hole. Therefore, the residue is reliably and easily collected through the discharge channel without leaking out of the discharge channel.

(Example) An example of this invention will be described below with reference to FIGS. 1 and 2.

A cylindrical casing body 1 is fitted into a pile hole 2 with its upper part protruding from the ground surface. Side wall 1 of the above-mentioned protruding portion of the casing body 1
Three discharge ports 3 . . . 3 are formed in a, two at diametrical positions and one in between. This side wall 1
A groove-shaped discharge passage 4 connected to the discharge holes 3, 3 at the diametrical position is branched and arranged along the direction a, and another discharge port 3 is disposed at the convergence part of the groove-shaped discharge passage 4.
are connected.

Furthermore, a communication port 5 is provided at the end of the confluence part of the discharge path 4.
is formed. One end of a storage tank 6 is connected to the communication port 5, and one end of a flexible discharge hose 7 is connected to the other end of the storage tank 6. Note that a suction pump 8 is interposed in the discharge hose 7. The connecting portion between the communication port 5 and the storage tank 6 is formed by a locking groove 5a formed outwardly along the vertical direction on both side walls of the connecting port 5, and a locking groove 5a formed outwardly along the vertical direction at one end of the storage tank 6. A locking protrusion 6a formed in the opposite direction is locked, and a tongue piece 6b provided horizontally at the bottom of the storage tank 6 overlaps the bottom plate of the communication hole 5.

Next, how to use this cylindrical casing will be explained.

First, for installation in pile hole 2, excavate pile hole 2,
The cylindrical casing body 1 is inserted into the pile hole 2 with the upper part protruding above the ground surface. Next, the storage tank 6 is lowered and the locking strip 6a is inserted into the communication hole 5.
It is inserted into the locking groove 5a and locked, and the tongue piece 6b is overlapped on the bottom plate of the communication hole 5. The tip of the discharge pipe 7 is installed at a suitable discharge collection location (not shown).

In this way, the cylindrical casing is installed in the pile hole, and then the residue inside the pile hole is discharged out of the pile hole by displacement. This residue or discharged material rises in the pile hole due to displacement and is discharged from the discharge hole 3 of the casing body 1 to the discharge passage 4 as shown by arrow A. The discharged material passes through the discharge path 4, is guided to the communication port 5, is sucked by the suction pump 8, is once introduced into the storage tank 6, and is then sent to the collection site by the discharge hose 7. Note that the communication port 5 and the storage tank 6 have an overlapping portion between the locking groove 5a and the locking strip 6a, and furthermore, the tongue piece 6b overlaps the bottom plate of the communication port 5, and the storage tank 6 has an overlapping portion with the locking groove 5a and the locking strip 6a. During the transfer of the effluent to the tank 6, leakage to the outside is prevented.

As described above, the residue in the pile hole 2 can be reliably and easily recovered to a predetermined location without leaking to the vicinity of the pile hole 1.

In addition, in the above embodiment, the discharge path is groove-shaped, but it may be cylindrical. In short, any material that can move the inflowing waste to a predetermined location without leaking out of the discharge channel is sufficient.

Further, the discharge path does not need to be along the side wall of the casing body, but it is sufficient if it is at least in communication with the discharge hole. However, in order to make the device compact, it is preferable that the discharge path run along the side wall of the casing body.

(Effect of the invention) As explained above, according to this invention, the cylindrical casing is fitted into the upper end of the pile hole, and the upper side wall that protrudes above the ground surface when the pile hole is inserted has a plurality of discharge holes. Since the drain hole is formed and the drain path is connected to the drain hole, there is an effect that the residue inside the pile hole can be transported to a predetermined location and reliably collected without leaking to the vicinity of the pile hole.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing an embodiment of this invention, and FIG. 2 is a partially front view. 1... Casing body, 3... Discharge hole, 4...
Exhaust channel.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cylindrical casing that is fitted into the upper end of a pile hole, in which a plurality of discharge holes are formed in the upper side wall that protrudes above the ground surface when the pile hole is inserted, and in these discharge holes,
A cylindrical casing for pile holes characterized by connected discharge passages. 2. The cylindrical casing for a pile hole according to claim 1, wherein the discharge passage is branched into a gutter-like shape on the side connected to the discharge hole.