JPH01190822A - Head structure for steel pipe pile - Google Patents

Abstract

PURPOSE:To reduce noise as well as to drive a pile efficiently by arranging a cushion member between a cap and a hammer, and thereby concurrently arranging a cushion member between the crest of a steel pipe pile and the cap. CONSTITUTION:A cushion member 2 fitted into the lower section of a cap 4 which has a hollow section at the upper and lower sections thereof, is arranged onto the crest of a steel pipe pile 1 the supporting section 1a of which is thickened. And a cushion member 2' is also arranged, which is fitted into the hollow section at the upper section of the cap 2. Then, the pile 1 is driven via the cushion members 2 and 2' by a hammer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a head structure of a steel pipe pile that is formed to reduce impact noise generated during driving.

[Prior art and problems to be solved by the invention] Conventionally, in driving steel pipe piles, both the pile driving machine and the pile body are covered with a soundproof cover, and at the same time, a steel pipe is installed on the end of the pile as shown in Figure 7. This is done by installing a cap and interposing a cushioning material on top to reduce the sound of the hammer.
The current situation is that the above measures are still not sufficient considering the impact on nearby residential areas.

This invention was made based on this background, and attempts to propose a new steel pipe pile structure with even higher soundproofing effects.

[Means to solve the problem]

In the present invention, further noise reduction is achieved by adding a cushioning material between the cap placed on the top of the steel pipe pile and the top of the pile.

At this time, if the cushioning material is simply placed on the steel pipe pile, the force will be concentrated on the thin steel pipe wall portion, and the cushioning material will be easily damaged when the pile is hit.

Therefore, this is supported on the anti-head under the cushion material,
A thickened support part is formed to prevent damage and at the same time transmit the impact force of the hammer downward, or a ring-shaped horizontal plate is installed between the cushion material and the top surface to perform the same role.

(Example〕 The present invention will be explained below based on the drawings showing one embodiment.

As shown in FIG. 1, this invention installs a cushion material 2 on the top end of a steel pipe pile 1, and stiffens the head support part 1a that receives the cushion material 1, or stiffens the cushion material 2 between the top end and the cushion material 2. A horizontal plate 3 is interposed therebetween.

As shown in the figure, the cushion material 2 is fitted under a cap 4 having hollow portions at the top and bottom and placed on the top end.

A conventional cushioning material 2' is fitted into the upper hollow part.

The cushioning material 2 is preferably made of wood, a heat-resistant reinforced resin, a material with elastic-plastic properties such as a metal softer than steel, or a composite material of these and rope.

In the embodiments shown in FIGS. 1 and 2, the support portion 1a is stiffened by increasing its thickness, and is made of steel and concrete, respectively. In the former case, an extra-thick steel pipe 5 having the same outer diameter as the steel pipe pile 1 is welded to the top of the steel pipe pile 1, and in the latter case, a pipe 7 wrapped with concrete 6 is welded to the top end of the steel pipe pile 1. is formed.

In the embodiment shown in FIG. 2, a steel horizontal plate 3 is disposed between the cushion material 2 and the concrete 6 in consideration of wear and tear.

The embodiment shown in FIG. 3 has a structure in which the cushion material 2 is supported by a ring-shaped horizontal plate 3.

The horizontal plate 3 is fixed to the top surface of the steel pipe pile 1 by welding or the like, and furthermore, a reinforcing rib 9 is provided below to prevent the horizontal plate 3 from being dented and to ensure that the impact force of the hammer 8 is transmitted to the steel pipe pile 1. Placed.

The reinforcing ribs 9 can be joined to the inner circumferential surface of the steel pipe pile 1 and the horizontal plate 3 through the holes in the horizontal plate 3, but in order to improve the efficiency of on-site work, it is recommended that they be integrated in advance at the factory or yard. is desirable.

In addition, when the diameter of the steel pipe pile 1 is small, the horizontal plate 3 may not be ring-shaped but may be a blind plate.

4 and 5 show other embodiments using a horizontal plate 3. In FIG. 4, a cushion material 2 approximately equal to the inner diameter of the steel pipe pile 1 is placed on the horizontal plate 3. This is an example in which a force transmission part is provided inside the pile, and FIG. 5 shows an example in which a cushion material 2 larger than the outer diameter is placed so that the force transmission part is placed directly above the thick carcass part. In the latter case, a side plate 3a is attached to the horizontal plate 3 to restrain the movement of the cushion material 2.

Fig. 7 shows an example of reinforcement when the cushioning material 2 is shaped into a donut shape to reduce its weight.
0.10 is inserted.

〔Effect of the invention〕

This invention is as described above, and has a structure in which, in addition to the cushioning material between the cap and the hammer, a cushioning material is also arranged between the top end of the steel pipe pile and the cap, and a force transmission means is provided to the head. It is possible to effectively reduce the noise between the cap and the pile during hammer impact, and at the same time, it is possible to efficiently and evenly impact the pile.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an embodiment of the first claim,
3-1 and II are a cross-sectional view, a plan view, and FIG. 4, respectively, showing an embodiment of the second claim. FIG. 5 is a sectional view showing another embodiment, FIG. 6-1, I[
7 is a cross-sectional view and a plan view showing an example of reinforcing a donut-shaped cushioning material, and FIG. 7 is a cross-sectional view showing a conventional structure. 1... Steel pipe pile, la... Support part, 2,
2°...Cushion material, 3...Horizontal plate, 3a...Side plate, 4...Cap, 5...Extremely thick pipe, 6... Concrete, 7... Pipe, 8... Hammer, 9... Reinforcement rib, 10... Steel rib. Figure 4 Figure 5 Figure 6 ■ Figure 7

Claims (2)

[Claims] (1) A steel pipe pile with a cushioning material installed between the driving cap placed on the top and the top.The head supports the cushioning material and reduces the impact force of the hammer downwards. A head structure for a steel pipe pile, characterized by forming a thickened support part that transmits information to the pile. (2) The first claim is characterized in that instead of the support part, a ring-shaped horizontal plate is installed between the bottom of the cushion material and the top surface to support the cushion material and transmit the impact force of the hammer downward. Head structure of the steel pipe pile described in Section 1.