JPH0418087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to pile driving performed at a construction site, particularly to a hollow pile driving method.

[Conventional technology]

In conventional pile driving work, piles are driven by applying impact to the base end of the pile using a diesel pile hammer or vibrating pile driver, or by applying continuous vibration. I found a way to do that.

[Problems to be Solved by the Invention] However, in this conventional method of applying impact to the pile and placing it, the impact noise and vibrations caused by the impact when the ram hammer collides with the pile propagate to the vicinity, and With the method of driving piles while applying vibrations, small vibrations are constantly propagated, causing discomfort, etc. If used in narrow spaces in the city, it will be a nuisance to nearby people, and the piles may be damaged by impact. The problem was that it was difficult to manage.

[Means for solving problems]

The present invention was made to solve this conventional problem, and its purpose is to create a pile driving method that prevents the impact noise and vibrations during pile driving from propagating to the outside and prevents pile damage. As a technical means for that purpose, the present invention involves inserting a hollow pile with a removably attached end cap into an insertion hole previously drilled in the ground, and inserting the hollow pile into a through hole in the hollow pile body. A ram hammer that is appropriately longer than the total length of the main body is inserted, a head hammer for driving the hollow pile main body is provided on the top of the ram hammer, a cushion material is inserted between the head hammer and the hollow pile, and the end cap is fixed with the ram hammer. Driving it into the ground and separating it from the hollow pile body to create an appropriate gap, extending the insertion hole with the end cap and driving the hollow pile body through the cushion material with the head hammer,
The pile can be inserted to the required depth with low vibration and noise.

[Effect]

Therefore, in the present invention, the ram hammer is formed to be appropriately longer than the hollow pile body, the ram hammer is inserted into the through hole of the hollow pile, the tip cap is driven in, and the tip cap is removed from the hollow pile body by an appropriate distance to open the insertion hole. Extend. Then, when the base end of the hollow pile body is driven through the cushion material with a head hammer, the insertion hole extended by driving the tip cap is driven. These two driving operations are repeated simultaneously to drive the hollow pile to a predetermined length. During this driving process, the end cap is driven into the ground, so the sound of the impact is absorbed underground. Also, since the hollow pile is driven through the cushion material, the impact is absorbed and vibrations are not transmitted to the outside, allowing the pile to be built quietly. Pouring can be carried out.

Furthermore, since the pile is placed through the cushion, there is no possibility of the pile being damaged by impact.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The hollow pile 1 used in the hollow pile driving method of this embodiment includes a hollow pile main body 2, a tip cap 3
Consisted of. Further, 4 is a ram hammer, 5 is a head hammer, and 6 is a cushion material.

The hollow pile main body 2 has a through hole 7, and the tip 8 has a tip cap 3 formed in a conical shape from a steel plate.
is removably attached to the head, and the base end 9 is used as a striking surface by the head hammer 5.

Further, the ram hammer 4 has a head hammer 5 at the top.
A piece 10 for lifting the crane is provided at the upper end, and the base end 11 of the ram hammer is connected to the tip cap 3.
It is used as a hitting surface. This ram hammer 4 is constructed by attaching a cushion material 6 to the head hammer 5 and the base end 9 of the hollow pile body 2 in a sanderch shape, inserting it into the through hole 7, and when the ram hammer base end 11 comes into contact with the tip cap 3, the head hammer 5 and A gap L is provided between the cushion material 6 and the cushion material 6.

Note that 12 is an insertion hole, and 13 is a wire rope for lifting the ram hammer. The cushion material 6 is made of urethane rubber or the like and is formed into a donut shape, and is held from the head hammer 5 by a wire rope 14.

The hollow pile 1 of this embodiment is fitted with a tip cap 3 and inserted from the tip cap 3 side into an insertion hole 12 previously drilled with an earth auger. Then, the cushion material 6 is inserted into the ram hammer 4, which is inserted into the through hole 7 of the hollow pile 1, and the ram hammer 4 is dropped from a certain height to the ram hammer base end 1.
1 collides with the tip cap 3. By repeating this, the tip cap 3 is driven forward until the head hammer 5 comes into contact with the cushion material 6, that is, until the gap L between the head hammer 5 and the cushion material 6 becomes zero. When this gap interval L becomes zero, that is, the head hammer 5 touches the cushion material 6.
When they come into contact with each other, a gap L is formed between the tip cap 3 and the tip 8 of the hollow pile body 2. Then, the pouring continues as it is, but the tip end cap 3 is struck underground so that the impact sound is not transmitted to the ground, and the insertion hole 12 is silently extended. Also, hollow pile 1
is inserted by simply hitting the proximal end 9 with the head hammer 5 through the cushion material 6. Therefore, the shock caused by the head hammer 5 is absorbed by the cushion material 6, and the vibration is not transmitted to the outside. Further, since the hollow pile body 2 is hit through the cushion material 6, there is no possibility that the hollow pile body 2 is damaged.

After finally driving the hollow pile body 2 to a predetermined depth, it is sufficient to continue driving only the hollow pile body 2 until there is no gap between it and the tip cap 3.

Although the embodiments of the present invention have been described above with reference to the drawings,
The specific configuration of the present invention is not limited to this embodiment, and any design changes that do not depart from the gist of the invention are included within the technical scope of the present invention.

For example, the tip cap 3 is formed of a steel plate into a conical shape, and the cushion material 6 is formed of urethane rubber into a donut shape, but the material and shape are not limited and any material and shape can be selected.

〔Effect of the invention〕

As explained above, according to the present invention, the ram hammer is inserted into the through hole of the hollow pile and hits the tip cap provided at the tip of the hollow pile, so the impact sound does not travel to the ground. Since the impact is made through the cushion material, vibrations are not transmitted and the pile can be placed quietly. Further, there is an advantage that the pile is not damaged by impact during installation and a highly reliable finish can be achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a hollow pile according to an embodiment of the present invention;
FIG. 2 is an explanatory diagram of the pouring order. 1...Hollow pile, 2...Hollow pile body, 3
... Tip cap, 4 ... Ram hammer, 5 ... Head hammer, 6 ... Cushion material, 7 ... Through hole, 12 ... Insertion hole, L ... Gap interval (gap).

Claims (1)

[Claims] 1 Insert a hollow pile with a removably attached tip cap into an insertion hole previously drilled in the ground,
A ram hammer that is appropriately longer than the overall length of the hollow pile body is inserted into the through hole of the hollow pile body, a head hammer for driving the hollow pile body is provided above the ram hammer, and a cushion material is placed between the head hammer and the hollow pile. The end cap is driven into the ground with the ram hammer, separated from the hollow pile body to create an appropriate gap, and the end cap is used to extend the insertion hole, and the head hammer is used to insert the cap into the hollow pile body through the cushion material. A hollow pile driving method characterized by inserting piles to the required depth with low vibration and low noise.