JP4070355B2 - Press-in assist device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a press-fitting auxiliary device for press-fitting steel pipe piles, and in particular, a press-fitting auxiliary device that can press-fit a steel pipe pile efficiently while securing a peripheral surface supporting force without requiring large power and auxiliary materials for filling. About.
[0002]
[Prior art]
When the steel pipe pile is press-fitted into the hard ground, an auger apparatus having a large diameter exceeding the outer diameter of the steel pipe is used, or a press-fitting auxiliary apparatus including an auger screw that can move up and down at the center position of the steel pipe pile.
[0003]
[Problems to be solved by the invention]
However, not only does it require a large amount of power to drive the large-diameter auger screw, but it also takes time to solidify the auxiliary material such as cement and chemicals and the like in order to secure the peripheral surface support force. Has the problem of becoming longer.
[0004]
An object of the present invention is to provide a press-fitting auxiliary device capable of efficiently press-fitting a steel pipe pile while securing a peripheral surface supporting force without requiring large power and auxiliary materials.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a press-fit comprising a mounting base having a fixing means for fixing to a steel pipe pile to be press-fitted, and a drilling means held by the mounting base and drilling a hole in the ground at the lower end of the steel pipe pile. In the auxiliary device, the drilling means comprises a casing auger that passes through the center of the steel pipe pile and a cored head that drills a circumferential groove along the inner periphery of the steel pipe pile, each exceeding the lower end position of the steel pipe pile. The press-fitting auxiliary device is configured by providing the mounting base with advance / retreat drive portions for the casing auger and the core removal head so as to advance and retreat.
[0006]
The press-fitting auxiliary device does not require a large amount of power by drilling means by a casing auger and a core punching head by dividing the inner peripheral ground of the steel pipe pile into a central part and an outer peripheral part, and without requiring a large amount of power. Because it can efficiently drill a hole with a large diameter that is almost the same as the inner diameter of the steel pipe pile without causing loosening of the steel pipe pile, the steel pipe pile is efficiently inserted with reduced tip resistance during press fitting, and the outer peripheral surface is supported. Power can be secured.
[0007]
The hole drilling means is provided with a rock drilling head that crushes the ground between the cored head and the casing auger, thereby dividing the inner peripheral side ground of the steel pipe pile into a central part, an outer peripheral part, and an intermediate part thereof. Drilling power can be further reduced by drilling.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the technical idea constituting the above-described solving means will be described below with reference to the drawings.
FIG. 1 is a side view showing a state where the press-fitting auxiliary device of the present invention is attached to a steel pipe pile to be press-fitted.
[0009]
The press-fitting auxiliary device 1 includes a mounting base 3 for fixing to a steel pipe pile 2 to be press-fitted, a casing auger 4 that passes through the center of the steel pipe pile 2, and a core that drills a circular groove along the inner periphery of the steel pipe pile 2. It consists of a punching head 5 and a rock drilling head 6 that crushes between the core punching head 5 and the casing auger 4.
[0010]
The steel pipe pile 2 is held to be press-fitted by a press-fitting device such as a pile press-fitting / retracting machine (not shown), and includes an advancing / retreating drive unit 7 such as a cylinder on the upper part of the mounting base 3. Provide up and down operation. The casing auger 4 is configured by providing an auger screw 10 in a pipe-shaped casing 9 provided with a rotation drive unit 9a and a discharge port 9b in the upper part.
[0011]
FIG. 2 is a longitudinal sectional view of a main part showing an internal configuration of the press-fitting auxiliary device of FIG.
The mounting base 3 is formed with a small-diameter portion 11 for fitting the steel pipe pile 2 on the outer peripheral portion thereof. The small-diameter portion 11 is provided with a fixing means such as a clamp 12 and surrounds the casing auger 4 at a lower portion thereof. The intermediate frame 13 is extended, and a lower frame 14 is provided at the lower end of the intermediate frame 13. The upper portion of the small-diameter portion 11 is a large-diameter portion for positioning that approximates the outer diameter of the steel pipe pile 2, and is configured separately if necessary. The fixing means acts on the outer side of the clamp 12 or the like and is fixed to the inner peripheral surface of the steel pipe pile 2.
[0012]
The core removal head 5 is provided with a blade 18 for forming a cylindrical groove having an outer diameter approximate to the inner diameter of the steel pipe pile 2 and forming a circular groove on the lower end surface thereof. A barrel portion 19 is extended on the upper portion of the core removal head 5, the barrel portion 19 is rotatably supported on a base 20 of the core removal head, a rotation drive portion 19a is provided on the base 20, and the rotation drive portion 19a. Thus, the cylindrical body portion 19 is driven around. The base 20 of the core removal head 5 is provided at the lower part of the mounting base 3 so as to be movable up and down via an advancing / retreating drive unit 20a such as a cylinder. The core removal head 5 is stroked up and down using the advance / retreat drive unit 20a as a slide guide.
[0013]
The trunk portion 19 has a smaller diameter than the inner diameter dimension of the steel pipe pile 2 and a larger diameter than the outer diameter dimension of the lower frame 14, and the acting force of the advancing / retreating driving section 20a and the rotation driving section 19a via the trunk section 19 is. Is transmitted to the core removal head 5.
[0014]
The rock drilling head 6 is configured by attaching a rock drilling machine 22a and a crushing claw 22b in a ring shape from the rock drilling part frame 21 surrounding the lower part of the casing auger 4 downward. The rock drilling part frame 21 is attached to the lower end of the lower frame 14 so as to be movable up and down via a rocking head advancing / retreating drive part 23 such as a cylinder.
[0015]
The press-fitting process of the steel pipe pile by the press-fitting auxiliary device having the above configuration will be described below.
FIG. 3 is an operation explanatory view showing the first step (center hole drilling step).
By lowering the casing auger 4 while being rotationally driven, a center hole A is formed in the ground at the center position of the steel pipe pile 2. In this case, the use of the casing auger 4 having a small diameter relative to the diameter of the steel pipe pile 2 enables efficient drilling without requiring large power.
[0016]
FIG. 4 is an operation explanatory view showing the second step (circular groove forming step).
The casing auger 4 is lifted and lowered while the cored head 5 is driven to rotate, thereby forming a circular groove B extending over a radial position substantially equal to the position of the inner peripheral surface of the steel pipe pile 2. The core removal head 5 can form the circular groove B by the circular operation without causing loosening of the inner and outer peripheral walls. In this case, the use of the core removal head 5 that forms a groove having a width smaller than the diameter of the steel pipe pile 2 makes it possible to efficiently form the circumferential groove without requiring large power.
[0017]
FIG. 5 is an operation explanatory view showing the third step (hole expanding step).
A hole substantially equal to the inner diameter of the steel pipe pile 2 by crushing the ring portion C remaining between the center hole A and the circumferential groove B by raising the core removal head 5 and lowering the rock drilling head 6 while operating. Is formed. In this case, the crushing waste is dropped into the center hole A, while the circular groove B can maintain the outer peripheral wall without loosening.
When press-fitting a small-diameter steel pipe pile, the rock drilling head 6 is omitted, and the entire cross section of the hole is efficiently drilled with low power and in the same manner in two stages by the casing auger 4 and the cored head 5. can do.
[0018]
FIG. 6 is an operation explanatory view showing the fourth step (pile press-fitting step).
By raising the rock drilling head 6 and lowering the steel pipe pile 2 by the pile press-fitting device, the steel pipe pile 2 is press-fitted along the large-diameter hole forming the outer peripheral wall of the circumferential groove B. In this case, since the steel pipe pile 2 and the press-fitting auxiliary device 1 are integrally lowered, it can be repeated from the first step. This repetition is continued until a predetermined press-fitting depth is reached.
Further, according to the situation, the rock drilling head 6 is fixed to the lower frame 14, and the rock drilling operation is performed together with the press-fitting and lowering of the steel pipe pile 2, so that the third and fourth processes are efficiently inserted into the hole. It is possible.
[0019]
As described above, the press-fitting auxiliary device requires a large amount of power when the hole drilling means including the casing auger and the core removal head divides and drills the inner peripheral ground of the steel pipe pile corresponding to the radial dimension. Without drilling the peripheral wall without causing loosening of the peripheral wall, it is possible to efficiently drill a hole with a large diameter substantially equal to the inner diameter of the steel pipe pile, and the steel pipe pile can be filled while suppressing the tip resistance during press-fitting. Therefore, the supporting force of the outer peripheral surface can be ensured without requiring a secondary material.
[0020]
FIG. 7 is a longitudinal sectional view of an essential part showing another embodiment of the press-fitting auxiliary device of the present invention.
The press-fitting auxiliary device 31 includes a mounting base 33 having a diameter smaller than the inner diameter of the steel pipe pile 2, and a separate positioning member (not shown) is provided above the mounting base 33 as necessary. The intermediate frame 13 that hangs down from the mounting base 33 is formed to a length that satisfies the vertical stroke of the core removal head 5, and the fixing means 12 and other members are configured in the same manner as described above. The press-fitting auxiliary device 31 can be applied regardless of the length of the steel pipe pile 2 by a compact configuration by being fixed in the steel pipe pile 2 by the small-diameter mounting base 33.
[0021]
【The invention's effect】
The press-fitting auxiliary device of the present invention has the following effects.
The above-mentioned press-fitting auxiliary device does not require a large amount of power by drilling means comprising a casing auger and a core removal head by dividing the inner peripheral side ground of the steel pipe pile into a central portion and an outer peripheral portion, and without requiring a large amount of power. Since the hole having the inner diameter of the steel pipe pile can be efficiently drilled without causing the loosening of the peripheral wall, the steel pipe pile can secure the supporting force of the outer peripheral surface while suppressing the tip resistance during press-fitting.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a press-fitting auxiliary device of the present invention is attached to a steel pipe pile to be press-fitted. FIG. 2 is a longitudinal sectional view of an essential part showing an internal configuration of the press-fitting auxiliary device shown in FIG. FIG. 4 is an operation explanatory view showing the second step (circular groove forming step). FIG. 5 is an operation explanatory showing the third step (hole expanding step). FIG. 6 is an operation explanatory view showing the fourth step (pile press-fitting step). FIG. 7 is a longitudinal sectional view of an essential part showing another embodiment of the press-fitting auxiliary device of the present invention.
DESCRIPTION OF SYMBOLS 1 Press-in auxiliary device 2 Steel pipe pile 3 Mounting base 4 Casing auger 5 Core removal head 7 Casing auger forward / backward drive part 12 Clamp (fixing means)
13 Intermediate frame 14 Lower frame 19 Trunk portion 19a Rotating drive portion 20 Base 20a Core withdrawal head advance / retreat drive portion 23 Rock drilling head advance / retreat drive portion 31 Press-fit auxiliary device 33 Mounting base A Center hole B Circumferential groove C Ring portion

Claims (2)

In the press-fitting auxiliary device comprising a mounting base having a fixing means for fixing to a steel pipe pile to be press-fitted, and a drilling means held in the mounting base and drilling a hole in the ground at the lower end of the steel pipe pile, the above-mentioned drilling means Consists of a casing auger that passes through the center of the steel pipe pile and a cored head that drills a circumferential groove along the inner circumference of the steel pipe pile, each for advancing and retreating beyond the lower end position of the steel pipe pile. And a press-fitting auxiliary device, wherein the mounting base is provided with an advancing / retreating drive unit for the core removal head. The press-fitting auxiliary device according to claim 1, wherein the drilling means includes a rock drilling head for crushing the ground between the core removal head and the casing auger.

Images