JPH0324662Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is used in the field of constructing cast-in-place concrete piles to process the excess concrete of the pile head mixed with a retardant without hardening it. Concerning pile head reinforcement concrete processing machine.

BACKGROUND ART The quality and strength of the pile head of a cast-in-place concrete pile deteriorates due to the concrete separating and dispersing when washed with water, or becoming entangled with slime and the like.

Therefore, in the past, it has been common practice to use a considerable amount of additional concrete and scoop out the additional concrete after excavating the ground.

In addition, recently, research has been conducted on a method of mixing a retarder into the excess concrete at the head of a pile to statically and easily remove the excess concrete without hardening it or in a state that is not very hard. ing.

Problems that the invention aims to solve Conventionally, heavy equipment such as a rock drill was required to scoop out the excess concrete part of the pile cap, and the scooping work required a great deal of time and effort. figure,
That's how expensive it was. In addition, there is a problem in that heavy noise, vibration, and dust are generated during the raking operation, which significantly deteriorates the working environment.

To implement a method in which a retardant is mixed into the excess concrete at the pile head so that the excess concrete does not harden, the retardant must be added immediately and uniformly to the entire area of the excess concrete after the concrete has been poured to a specified level. Must be mixed evenly. It must also be mixed in without being deterred by the presence of cage-shaped reinforcing bars for piles, so if a rotating blade is used, for example, high-speed rotation of about 100 to 150 rpm is required. Furthermore, since the pile cap of a cast-in-place concrete pile is usually at a depth of several meters to more than 10 meters underground, for example, a long rotating shaft driven by an above-ground rotary machine is inserted into the stirring impeller to rotate at the high speed described above. When I try to do this, the rotating shaft shakes so much that it becomes unusable. For the above reasons, at present, mixing of retardants,
A serious problem is that no effective means or equipment for processing excess concrete, known as stirring, has been found.

Therefore, the object of this invention is to provide a pile head concrete processing machine that can quickly, reliably, easily, and inexpensively process concrete concrete by mixing a retardant and stirring it.

Means for Solving the Problems As a means for solving the above problems, the pile head reinforcement concrete treatment machine for cast-in-place concrete piles according to this invention is suspended above the ground as shown in the drawing. A supported rod 1 of a required length, a drive unit casing 2 with a watertight container structure attached to the lower end of the rod 1, and a hydraulic motor 3 installed inside the casing 2.
and a planetary gear mechanism 7 rotationally driven by the prime mover, and a shaft 7d of the planetary gear 7c in the planetary gear mechanism 7 that protrudes downward from the lower end of the casing 2 as short as possible and in a watertight manner. A rotating shaft 4, a stirring blade 5 attached to the rotating shaft 4, and a retardant injection nozzle 6 opened at a portion of the stirring blade 5.

Note that the drive unit casing 2 is provided with a stabilizer 20 on its outer periphery.

Function: This pile head concrete processing machine is used by suspending and supporting the rod 1 using, for example, a crane 10 on the ground, and inserting the rod 1 into the pile head concrete 23 underground.

That is, when the hydraulic motor 3, which is the power source, is started, it drives the planetary gear mechanism 7, and the planetary gear 7
The axis 7d of c is rotated (rotated) at a high speed of about 100 to 150 rpm, which is necessary for stirring the extra concrete 23, while revolving around the earth. Therefore, the stirring blade 5 attached to the rotating shaft 4 also rotates at high speed while largely revolving around the rotating shaft 4, and the excess concrete 23 is vigorously stirred.

In particular, since the stirring blades 5 revolve around each other, even if the mechanical device itself is installed and fixed at approximately the center of the pile hole 21, the excess concrete 23 will cover the entire area from the center to the periphery. is efficiently stirred. In particular, when treating piles with a diameter of φ800 to φ2000, the diameter of the stirring blade 5 should be at most φ600, which is sufficient. On the other hand, if the diameter of the stirring blade 5 is small, the power of the hydraulic motor 3 may be correspondingly small, so that even a lower-priced one can be used.

Furthermore, since the rotating shaft 4 is short, there is almost no vibration during high-speed rotation, allowing stable operation.

Therefore, when the retarder 8 (including the super retarder) is supplied through the injection pipe 6, the retarder 8 is rapidly and homogeneously mixed in the entire area of the excess concrete 23, improving its effectiveness. This is where you can fully demonstrate your skills.

In other words, the solidification of the extra concrete 23 is delayed, and it can be rejected as a soft material that has not fully hardened even after the ground has been opened, making it possible to easily expose a high-quality concrete portion as a pile head, and to remove the concrete from the previous pile. No work is required.

Embodiment Next, a preferred embodiment of the invention shown in FIGS. 1 and 2 of the drawings will be described.

First, FIG. 1 shows the structure of the main parts of the pile head reinforcement concrete processing machine according to this invention.

1 in the figure is the crane 1 on the ground as shown in Figure 2.
It is a rod suspended and supported vertically. The lower end of the rod 1 has three chambers 2A, 2, upper, middle, and lower.
A drive unit casing 2 having a watertight container structure made of B and 2C is attached.

The rod 1 serves as a non-rotating support to take the reaction force against the rotation of the stirring blade, and is therefore made into a rectangular rod. Moreover, in order to make it possible to use the crane 10 to dispose of pile heads located between 0 m and 10 m underground, a crane with a length of about 10 m or more is usually used.

Reference numeral 3 in FIG. 1 denotes a hydraulic motor (or a prime mover or other rotary prime mover) as a rotary power source.
This is installed in the upper casing 2A forming the drive part casing 2. Its output shaft 3a
reaches the lower casing 2c that houses the planetary gear mechanism 7 through the intermediate casing 2B,
It is supported by a bearing 12 provided on the partition plate 11.

The planetary gear mechanism 7 is mainly composed of a pair of upper and lower rotary plates 7a, 7a which are arranged concentrically with the output shaft 3a and are integrated by a connecting rod 7b. This rotating plate 7a,
Between 7a, the eccentric distance R is about 250mm,
The vertical shaft 7d of the planetary gear 7c is connected to the bearings 7e, 7e.
It is rotatably supported by. Planetary gear 7c
is meshed with an internal gear 7i fixedly provided on the lower casing 2c. A swivel ring 7f provided in the shape of a skirt on the upper rotary plate 7d is rotatably supported with a ball 2h sandwiched between the swivel ring 7f and a binding ring 7g fixed to the lower casing 2c on its outer periphery. The lower rotary plate 7a is connected to the lower casing 2c.
It is rotatably and watertightly slidably contacted with the lower end of the seal ring 7k via the seal ring 7k. Planetary gear 7c
The shaft 7d projects downward in a watertight manner via a seal ring 7m installed on the bearing portion of the lower rotary plate 7a. A shaft joint 13 is provided at the upper center of the upper rotating plate 2a, and is connected to the output shaft 3a of the hydraulic motor 3.

Therefore, when the hydraulic motor 3 is started, the shaft 7d of the planetary gear 7c revolves on the circumference of the radius R.
Due to the meshing motion between the planetary gear 7c and the internal gear 7i, the gear rotates at a desired high speed (rotation) of 100 to 150 rpm based on the tooth ratio of both wheels.

Reference numeral 4 in FIG. 1 is a rotating shaft with a length of about 1.5 m that is connected to the shaft 7d of the planetary gear 7c and projects downward. A stirring blade 5 having a radial shape and having a diameter of about φ600 is attached to its lower end.

Further, numeral 6 in FIG. 1 is a retardant injection nozzle formed of a rigid metal pipe or the like, and its tip is opened at a position directly above the stirring blade 5. The injection nozzle 6 is provided so as to pass through the center of the upper and lower rotating plates 7a, 7a of the planetary gear mechanism 7, and communicate with an injection hole 15 provided in the axial direction of the center of the output shaft 3a. The upper end of the injection hole 15 is connected to the swivel hose 18 via an annular groove 17 formed on the inner peripheral surface of the swivel joint member 16.
The swivel hose 18 is connected to a swivel pump unit 19 on the ground.

However, the injection nozzle 6 may be provided so as to reach the stirring blade 5 in a detour around the outside of the drive unit casing 2.

Reference numeral 20 in FIG. 1 denotes stabilizers provided radially around the outer periphery of the upper casing 2A, which are used to prevent vibration during operation.

An example of how to use the pile head reinforcement concrete processing machine with the above configuration is shown in Fig. 2. That is, the rod 1 is suspended and supported by a crane 10, and is passed through a rotary pedestal 26 fixed to the upper end of a pile hole 21 to receive a rotational reaction force, and the stirring blade 5 is suspended from the pile hole 21.
Cast-in-place piles in 1 that have already been concreted 2
Insert it until it reaches the excess concrete 23 in 2. Then, the hydraulic unit 25 on the ground is operated to start the hydraulic motor 3 to make the stirring blades 5 revolve and rotate, and at the same time, the swivel pump unit 19 is started and the retarder 8 is injected.

The rod 1 and the drive unit casing 2 are positioned approximately at the center of the pile hole 21 so that the stirring blade 5 does not interfere with the cage-shaped reinforcing bar 24 of the cast-in-place pile 22. The hydraulic motor 3 is connected to the ground hydraulic unit 25.
is connected with a hydraulic hose.

The rod 1 is used as an earth drill rod in place of the crane 10, and has a drive part casing 2 at its lower end.
It can also be used with the following attached:

Effects of the invention As described above in detail along with the examples, the pile head excess concrete processing machine of this invention has the following features:
By suspending and supporting the rod 1 with a crane 10 or the like on the ground, it can be used to quickly and reliably process the pile head concrete pile 23, regardless of the underground depth position of the pile head pile concrete 23.

At this time, since the stirring blade 5 rotates while revolving greatly, by appropriately selecting the revolution diameter 2R, the diameter of the stirring blade 5 can remain as small as φ600 for cast-in-place piles 22 with a diameter of φ800 to φ2000. In addition, even if the center position of the machine remains fixed, the entire area of the excess concrete 23 can be stirred uniformly and efficiently.

In particular, since the stirring blade 5 makes a planetary motion,
Since turbulence is likely to occur in the excess concrete 23 and the stirring effect is large, the entire area of the excess concrete 23 is sufficiently stirred and the retardant 7 is mixed homogeneously despite the presence of reinforcing bars 24. Therefore, the effect of the retarder 7 can be fully exhibited.

Therefore, the extra concrete 23 is not hardened,
Alternatively, it can be easily removed after excavating the ground without becoming too hard. In other words, the processing work can be done much more easily, inexpensively, and in a shorter time than by combing, and without deteriorating the work environment.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of the pile head reinforcement reconcrete processing machine according to this invention, and FIG. 2 is an elevational view showing the state of use.

Claims (1)

[Claims for Utility Model Registration] [1] A rod 1 of a required length that is suspended and supported on the ground, a drive unit casing 2 with a watertight container structure attached to the lower end of the rod 1, and installed within the casing 2. A prime mover such as a hydraulic motor 3 and the like, and a planetary gear mechanism 7 rotationally driven by the prime mover, and a shaft 7d of the planetary gear 7c in the planetary gear mechanism 7 that extends downward from the lower end of the casing 2 in a short and watertight manner. A cast-in-place pile comprising: a protruding rotating shaft 4; a stirring blade 5 attached to the rotating shaft 4; and a retardant injection nozzle 6 opened at a portion of the stirring blade 5. Pile head excess concrete processing machine. [2] Utility Model Registration A pile head excess concrete processing machine for cast-in-place piles, characterized in that the drive unit casing 2 described in claim 1 is provided with a stabilizer 20 on its outer periphery.