JPH0743164Y2 - Chuck mechanism of pile press-in / pull-out machine equipped with fluid ejection mechanism - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a chuck of a pile press-in / pull-out machine, and more specifically, a pile press-in / pull-out machine equipped with a mechanism for injecting a fluid onto the surface of a steel pile clamped by the chuck. Regarding chucks.

(Prior art) Steel piles such as steel sheet piles and steel pipe sheet piles that are continuously driven in the ground and used for various civil engineering works such as construction of retaining walls are installed on the surface of the piles during underground driving or pulling out. A large friction resistance is applied.

For this reason, in the past, in order to reduce the frictional resistance when driving and pulling out the pile, reduce the frictional resistance by spraying water on the surface of the pile with a hose or by manually applying oil or bituminous agent to the surface of the pile or the grip part. I was trying.

(Problems to be solved by the invention) However, when water is sprinkled on the surface of the pile, a large amount of water is required, which often makes it difficult to secure the water source.
However, there were drawbacks such as the softening of the ground due to the large amount of water being poured into the ground.

Therefore, a method of applying a friction-reducing agent to the surface of the pile to be press-fitted in advance was also considered, but this method requires time and effort to obtain the application of the friction-reducing agent, which is rather inefficient. It was

Furthermore, the adhesion force of the friction resistance agent to the pile surface is weak when applied manually. This is because sand or dust adheres to the surface of the pile, which hinders adhesion of the friction reducer to the surface of the pile, or bubbles are generated in the friction reducer during application.

The present invention has been made in view of such an actual situation, and by attaching a fluid injection mechanism to the chuck and ejecting the fluid to the surface of the pile at the time of press-fitting and withdrawing, the resistance when the press-fitting of the pile is easily and surely reduced. In addition, it is an object of the present invention to provide a chuck mechanism for a pile press-in / pull-out machine that can remove soil and the like attached to the pile surface.

(Means for Solving the Problems) In order to solve the above problems, the present invention comprises a clamp below the base, a mast is provided vertically above the base, and a tip of the mast leader is provided. A pile press-fitting / pulling machine in which an arm having a chuck is slidably mounted is characterized in that a fluid injection mechanism is formed below the inside of the chuck.

(Operation) The pile which is press-fitted is clamped by the chuck configured in front of the base of the pile press-in / pull-out machine, and the chuck is lowered to press the pile into the ground.
At the time of this press-fitting, the friction reducing agent is injected from the injection mechanism onto the surface of the pile. As a result, the friction resistance between the ground and the pile is reduced when the pile is pressed in, and efficient pile press-in can be performed.

At the time of pulling out the pile, water is jetted from the jetting mechanism to the surface of the pile to remove the soil adhering to the surface of the pile while pulling it out.

(Embodiment) An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a pile press-fitting / pulling machine, and FIG. 2 is an enlarged front view of a chuck.

The pile press-fitting / extracting machine 1 described in the present embodiment is fixed to the upper end of a steel sheet pile P press-fitted into the ground via a plurality of clamps 4 formed at the lower end of a base 5. A mast 6 is erected vertically on the pile press-in / pull-out machine 1, and an arm 8 having a chuck 2 for clamping the press-in pile at the tip is slidably attached to a leader 7 of the mast 6. . When the arm 8 is lowered, the steel sheet pile P held by the chuck 2 is pressed into the ground.

A fluid ejection mechanism 3 is formed near the chuck 2. The jetting mechanism 3 includes a plurality of nozzles 31 formed inside the lower end of the chuck 2 and a pipe as a fluid passage.
32 and a fluid storage tank (not shown).

The number of nozzles 31 of the above-mentioned jetting mechanism is appropriate, and the jetting sheet P can be constructed on one side or both sides of the chuck 2 so that only one side or both sides can be jetted. In particular, the nozzle 31 can be provided with directivity so that the nozzle 31 is intensively jetted to a portion having a large frictional resistance such as the grip portion P1 of the steel sheet pile P. Further, the injection pressure or the injection angle of the fluid can be adjusted in order to evenly spray the steel sheet pile P surface.

In this way, the friction reducing agent is sprayed to remove sand and dust adhering to the surface of the steel sheet pile P while being surely applied in close contact with the surface of the steel sheet pile P, so that the application effect lasts for a long time. Even when the steel sheet pile P is pressed into the ground, peeling of the friction reducing agent can be minimized.

The fluid storage tank may be configured integrally with the pile press-fitting / pulling machine 1, or may be configured separately. This tank is
Two types are required, one for the friction reducing agent and one for the water, and a switching valve is provided in the middle of the pipe 32 so that the fluid to be sprayed can be appropriately selected.

As the friction reducing agent, various kinds of surfactants and other arbitrary materials can be selected. Preferably, after spraying, it adheres to the surface of the steel sheet pile P to form a gel, and even after the steel sheet pile P is pressed into the ground, it adheres to the surface of the steel sheet pile, and when the steel sheet pile is pulled out, this friction reducing agent causes pullout resistance. What can reduce the

In the use of this embodiment, the pile press-in / pull-out machine 1 is arranged on the existing steel sheet pile, and the steel sheet pile P to be press-fitted is clamped by the chuck 2 and lowered to press the steel sheet pile P into the ground.

When press-fitting the steel sheet pile P, the surface of the steel sheet pile P or the grip portion
The injection mechanism 3 injects a friction reducing agent to P1. Therefore, a film of a friction reducing agent is formed on the surface of the steel sheet pile P, and friction with the ground when the steel sheet pile P is press-fitted is reduced.

Further, when the steel sheet pile P is pulled out, water is jetted from the jetting mechanism 3 onto the surface of the steel sheet pile P to wash away the dirt and the like adhered to the surface of the steel sheet pile P.

Conventionally, steel sheet piles pulled out from the ground are rarely washed at the construction site, and they are transported with soil adhered and washed in stockyards. For this reason, there have been problems such as the vehicle becoming heavily soiled and the road being transported contaminated. However, according to the above-described embodiment, the above problems are solved by pulling out the steel sheet pile while cleaning.

In this embodiment, the case where the steel sheet pile is press-fitted by using the pile press-fitting / extracting machine is described, but the present invention is not limited to this and can be applied to a steel pipe pile or a steel pipe sheet pile.

(Effect of the Invention) As described above, according to the present invention, since the fluid ejecting mechanism is provided in the lower part of the inside of the chuck, the labor and time for attaching it outside the chuck can be saved, and the fluid ejecting mechanism is prevented from being damaged by an external force. it can. Also, since the fluid can be applied to the surface of the pile in a simple and reliable manner while press-fitting the pile into the ground, the work time for fluid application is shortened and no manpower is required. And the like.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of a pile press-fitting / pulling machine, FIG. 2 is an enlarged front view of a chuck, and FIG.
The figure is a plan view showing a jetting state of a fluid. 1 ... Pile press-in / pull-out machine, 2 ... Chuck 3 ... Injection mechanism, P ... Steel sheet pile

Claims (1)

[Scope of utility model registration request] 1. A pile press-fitting / extracting machine in which a clamp is formed below a base, a mast is vertically provided above the base, and an arm having a chuck at its tip is slidably attached to a leader of the mast. A chuck mechanism for a pile press-fitting / extracting machine having a fluid ejecting mechanism, wherein a fluid ejecting mechanism is provided below the inside of the chuck, and the fluid is ejected from the ejecting mechanism onto the surface of the pile sandwiched by the chuck.