JPS58189419A - Attachment for pile driving - Google Patents

Abstract

PURPOSE:To generate a striking force with short cycles and lesser vertical vibration amplitudes by a method in which an excavating tooth is projectionally provided at the downside of an attachment to be fitted with the lower end of a pile and an elastomer is set on the upside of the bottom plate. CONSTITUTION:In an attachment B for driving a pile, an H-shaped hollow cap 1 slightly larger than a pile A is formed by matching the shape of the lower end of various kinds of piles, e.g., H-shaped steel pile A. Also, an excavating tooth 2 of a triangle form is projectionally formed on the downside of the hollow cap 1, and an elastic material 3, e.g., plate spring, etc., is set on the inner bottom plate of the hollow cap 1. The attachment B is fitted into the lower end portion of the pile A and the pile is driven vibrationally, whereupon the vibration and load of the pile A are transmitted to the attachment B and a striking force is generated to the ground by the attachment B itself.

Description

[Detailed description of the invention] Currently, various types of piles (sheet piles,
HIl! (Steel bisivile crete piles, steel pipe piles, etc.) are being driven into the ground, and in order to prevent vibration and noise pollution, a vibration-generating type (pipe range-free) is used instead of a hammer for the pile driving work. One pile driver is used.

As is well known, the vibration-generating pile driver erects a pile vertically on the ground surface, supports the upper end of the pile, applies vibration and weight to the pile, vibrates the pile, and reduces the vibration of the lower end of the pile relative to the ground. and the load (
Due to the heavy noise of the pile driver and the pile's own weight), the load is gradually falling into the ground.

However, since the pile driving force is only vibration and load as in the 1st century, 1) Especially when driving into the ground of fluid soil such as sand, powder, or granules, the vibrations can easily remove the pile from the bottom end. When the soil is fluid, it returns to the bottom end of the pile before the pile can descend with a heavy force.In other words, the sand, etc. dances around the bottom end of the pile due to vibration, and the pile A phenomenon occurs in which the piles do not descend smoothly, and in reality, the time it takes to drive one pile takes 2 to 3 years of normal soil.

1) - The quality of the pond bed, especially if there are large rocks mixed in the soil,
When the bottom end of a pile hits a hard object, such as when there is a bedrock, it cannot be driven with vibration and load alone (unlike conventional hammering, which destroys the pile with a strong blow), and Pawning stops, the pile bends or changes direction, or the lower end of the pile splits at that point, making it impossible to continue driving.

3) In the case of viscous soil, the adhesive friction with the surrounding surface of the pile is large, so vibrations and loads are not well transmitted to the pile, slowing down the progress of penetration.

Problems such as these often occur, and the solution is 4! It was what was desired.

The present invention has been made in view of the above circumstances, and has developed a round attachment (-mt7) cap for driving through piles that fits into the lower end of a multi-fence pile prior to the pile driving operation.

In other words, the attachment V'i steel material, etc. is formed into a cap shape that is slightly larger than the shape of the lower end of each fence stake, and when driving the stake, the lower end of each fence stake is shaped like a cap. When the attachment is fitted to the pile in a vertically movable state that is slightly separated from the lower end surface and driving work is performed using the vibration-generating pile driver, the attachment is slightly separated from the shape of the lower end of the pile. Because they are loosely fitted, the movement and load of the pile are not directly transmitted as vibrations and loads, and the vibrations and loads of the pile are not directly transmitted as vibrations and loads, but as shocks or strikes (blows similar to hammer blows) with very fast cycles and small vertical vibration amplitudes. communicated.

Therefore, the attachment itself generates a blow with a very fast cycle and a small vertical motion amplitude (hereinafter simply referred to as a blow similar to a hit) to strike the lower surface contact ttht and descend into the excavation. This is what I did.

Now, to explain the embodiments of the present invention, the pile driving attachment B of the present invention can be used to attach various sails A1 to
For example, an H-shaped hollow cap part L that matches the shape of the lower end of the H-shaped steel pile', A and is slightly larger than the skeleton part is formed, and a thick wall such as a triangle is formed on the lower surface of the hollow cap part. Steel plate pieces, etc. are integrally welded and fixed to form a protruding rigid tooth part,
An elastic material 3 such as a plate ridge is installed on the bottom plate surface of the trench 9 and the hollow cap 1. A crane or a heavy lifting machine that uses a motion-generating pile driver, S indicates a motion-generating pile driver.

Note that the hollow cap and drilling teeth are normally energized.
lf, is expressed using a steel material, and the material is changed depending on the application, taking strength into consideration, and heat treatment for drilling teeth, bonding of carbide tips, etc. are performed.

In addition, the above example shows the case of H-type steel pile A, and #'i is used for sheet piles, concrete piles, and steel pipe piles. If you compose it, it becomes a town.

In the above configuration, when the attachment B of the present invention is fitted to the lower end of the pile to be driven by the motion-generating pile driver S, and vibration driving is performed in the same manner as in the conventional method, the pile is driven as described above. The motion and load of A are transmitted to attachment B as a blow similar to a hammer blow, and therefore attachment B itself generates and acts on the ground as a blow similar to a hammer blow, excavating the ground and penetrating and descending. .

During the above action, the elastic material 3 in the hollow cap I uses its elastic force to act as a scrap wire due to the downward load of the pile A due to the vibration, and directly transmits the blow to the attachment member (H), and the upward load of the pile A causes the elastic material 3 to become elastic. It acts to release the attachment member) B from the resistor A, and the attachment member) B is attached to the lower part of the pile A and moves together, so it is simply a symbiotic body of vibration and load action. This prevents the above-mentioned effects of the present invention from being lost. The elastic material 3 may be a plate spring pond, a coil spring, a combination of a spring and an upper plate piece, a rubber plate, or the like.

In addition, if earth and sand enters between the attachment B and the aSS surface directly below the pile when the person advances, if the attachment of the present invention is used in the above-mentioned Yujo Kisumi formation and action, 1), fluid sand, powdery , even for granular soil 1,
Since the present invention uses a blow similar to a hammer rather than photography and load, the earth and sand that has been removed and removed will not return to the underside of the pile.
Pile driving by horizontal hammer driving can be performed with the same efficiency as the conventional method.

2) Even if a collision occurs with hard ground or rocks mixed in the soil, bedrock, etc., it is not only due to vibration and load, but due to a blow similar to hammering, so it is necessary to destroy them by impact (rock drilling). Function) It is possible to drive the pile, so there is no risk of damaging the lower end of the pile or changing the direction of pile driving. obtain.

In addition, when driving into ground with a lot of rock, it is also possible to selectively use some powerful attachments with high excavation performance.

3) Furthermore, because the attachment of the present invention is formed slightly larger than the lower end of the pile due to its structure, the area of the hole to be drilled is naturally larger than the cross-sectional area of the pile. When continuing, there is less friction between the pile circumferential surface and the inner circumferential surface of the excavation hole, which improves the transmission of vibration and load to the pile. However, by using the attachment of the present invention, the friction on the circumferential surface of the pile was reduced and #Zoni was resolved.

In addition to solving the problem of conventional methods, there are many new methods that have many new effects and can make pile driving work more efficient.

[Brief explanation of drawings]

#l is an explanatory view of driving a pile fitted with eight examples of the attachment of the present invention (H1 # attachment). 1 How many minutes, A... resistance, B... pile driving of the present invention Instep attachment; l...-hollow camp part, C...excavation tooth part, 3...elastic material, D...crane manake heavy weight, S...vibration-generating pile driver. Figure 1 ヱ 2.rI!J B8'A'-A' Figure 3

Claims (1)

[Claims] Form a hollow cap part slightly larger than the upper end shape of each type of pile with steel material, etc., and integrate the excavation tooth part with a thick triangular piece of steel material etc. on the lower surface of the hollow cap part. An attachment for driving piles that has a protruding shape and has elastic members such as plate ribs installed on the inner bottom plate surface of the hollow cap.