JPS59192124A - Pile head treatment and multiple tube therefor - Google Patents

Abstract

PURPOSE:To treat the head of a pile with good efficiency without occurrence of such pollution as vibration and noise by charging a static breaking agent into the inside tube of plural ringed tubes mutually connected with each other concentrically. CONSTITUTION:Steel sheath tubes 1 and 2 of a ring form are set in a concentrical form, and both ends of connecting metals 5 are clamped and connected to places at which the peripheries of the steel sheath tubes are almost equally divided into six sections to form a multiple tube. A tremie tube (not illustrated) is inserted into the inside of the inside sheath tube 2 and concrete is placed to the height of an extra-banking. A static breaking agent in the sheath tube 2 is expanded to develop cracks 10 horizontally along the line 8 and thereby the extra- banking portion of the concrete 9 is separated from the pile body portion 9b and easily removed by crane, etc., when cutting the footing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile cap treatment method for cast-in-place concrete piles and a multilayer pipe used therein.

Conventionally, the pile cap of a cast-in-place concrete pile does not have the specified strength because it is formed with a concentration of defective concrete mixed with impurities such as slime, so the pile cap is made higher than the specified top end of the pile in advance. Pile head treatment is carried out by forming a pile as a backfill, and after hardening, grinding the backfill with a breaker and removing it. However, the workability is poor and requires a lot of labor and time, increasing construction costs and construction time. Prolonged prolongation of 2 coming or 9?
It had the disadvantage of generating pollution such as noise and vibration. ◇ The non-invention was to arrange multiple ring-shaped g concentrically and connect them to each other, rearrange them on the horizontal dividing plan line, and pour concrete. After the Qi required time r11J has passed, the static crushing agent in the inner pipe expands and horizontally divides d [by separating the excess pile from the pile main body along the drawing line, it generates pollution such as noise and vibration. The illustrated embodiment will be described below.

1.2 is a ring-shaped sheath pipe made of 'dI, the outer sheath pipe l has a slightly larger diameter than the hoop reinforcement 4 of the cage reinforcing bar 3, and the inner sheath pipe 2 has a diameter of approximately the diameter of the sheath pipe l. It is 2/3 the diameter.

The sheath tubes 1.2 are arranged concentrically on the same plane, and the two ends of the connecting fittings 5 are tightened and connected with screws 6 at approximately six equal parts on each circumference to form a multiple tube. A known static crushing agent in the form of a slurry that develops expansion pressure after a predetermined period of time is fully injected into the outer sheath pipe 1.
Leave empty.

Thus, the above-mentioned multiplex 9k is fitted to the squirrel cage reinforcing bar 3 with the longitudinal bar 7 located between the sheath pipes 1 and 2, and the sheath pipe 17 is fitted to the cage reinforcing bar 3 with the vertical bar 7 located between the sheath pipes 1 and 2. The connection fitting 50PJrB is placed horizontally on the outside and tightened with wire, tape, etc. to the hoop muscle 4', and a foamed polyethylene wire is attached to the part of the vertical reinforcement 7 that extends slightly above the hoop muscle 4'. Cover the cylindrical insulating material 7'. After that, this cage-shaped reinforcing bar 3 is inserted into a pile hole or a casing tube (not shown), so that the sheath pipes 1 and 2 are located on the horizontal dividing planned line 8 between the extra layer and the pile body. Keep it
From the inside of the sheath t2, the tremie tube (l
b) Insert the purple concrete and pour it to the required height of the comfleet ladle.

In this way, after the required time has elapsed for the cast concrete 90, the static crushing agent in the sheath pipe 2 buried at the horizontal dividing M The horizontal cross-sectional area of only the outer sheath pipe 1 is missing, and the sheath pipe 1 is empty and its pressure resistance is lower than that of other parts. A crack of 1° occurs horizontally along the pile, and the excess portion 9a of the concrete 9 is separated from the pile body portion 9b, which can be easily removed using a crane or the like during root cutting.

In this case, the portion of the vertical reinforcement 7 extending above the hoop reinforcement 4' is completely covered with the insulating material 7'.

In the above embodiment, a case was explained in which two sheath pipes made of 'M' were connected, but an appropriate number of three or more pipes may be connected depending on the pile diameter, and static breakage,
The outermost tube into which the crushing agent is not injected may be made of any suitable material other than metal, such as a synthetic resin tube and a paper tube.

Also, static crushing agent? The inner tube to be injected is the heavy steel sheathed tube shown in the example, but it is not limited to this, and any material other than a sheathed tube may be used as long as it does not reduce the expansion pressure grade of the static crushing agent. A tube may also be used. Furthermore, the static crushing agent may be injected after the multiple pipes are attached to the cage reinforcing bars 3.

As stated above, it is clear from Section C that according to the uninvented invention, the expansion pressure of the static crushing agent crushes the comfleet and separates the excess pile from the pile main body. The disadvantages of increasing the construction cost, prolonging the construction period, and causing pollution due to one sound vibration when using a full breaker for the raised part are eliminated.
C can be resolved.

In addition, the expansion pressure of the static crushing agent injected into the inner pipe of multiple pipes arranged concentrically along the horizontal dividing plan line between the back pile part and the pile main part was generated. However, since the horizontal section 11i is missing only in the empty pipe section, and this pipe is empty, the pressure resistance strength is lower than that of other parts. It can be generated along the dividing planned line, and there is no possibility of accidentally crushing the pile body portion below the horizontal dividing planned line.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway perspective view of a multi-pipe tube, FIG. 2 is a front view of a connecting fitting, and FIG.
The figure is a perspective view showing the state in which multiple pipes are attached to the squirrel cage reinforcing bars, and Figure 4 is a cross-sectional view showing the state in which the reinforcement part and the pile body part are horizontally divided along the planned line. 9a... Excess portion, 9b... Pile main body part, 8... Horizontal division d [drawing line, 1, 2... Sheath pipe.

Claims (1)

[Scope of Claims] L A ring-shaped pipe injected with a static crushing agent and a ring-shaped pipe in which the static crushing agent is not injected are arranged completely concentrically on the planned horizontal dividing line between the pile main body portion and the extra heap portion. After that, concrete is poured, and after the required time has elapsed, cracks due to the expansion pressure of the static crushing agent are generated toward the pipes where the static crushing agent has not been fully injected, thereby causing the above separation. A pile head processing method characterized by separating the extra heap portion from the pile body portion force λ along the IT drawing line. 2. Multiple pipes used in the pile cap processing method, which are arranged in concentric circles and connected to each other, and all of the static crushing agent is injected into the inner pipe of a plurality of ring-shaped pipes.