JPH03286022A - Method for driving joint pile - Google Patents

Abstract

PURPOSE:To improve the hardening of the ground end its filler by vibrating a joint pile vertically at a frequency and amplitude, which are prescribed based on the pile shape and the ground conditions, to drive the pile into the ground. CONSTITUTION:A joint pile 1 has joints 3 projected laterally from its body 2 of circular cross section and installed longitudinally at certain intervals. The pile 1 is arranged on the ground 5, held in a chuch 12 of a vibration pile driver 10 having variable vibration frequency and amplitude. On the ground surface around the pile 1, sand and cement are heaped up in a dried mixture. Then the vibration pile driven 10 is operated at a frequency and amplitude, which are prescribed considering the situations of the pile 1 and the ground 5 based on preliminary experimental data, to drive the pile 1 into the ground 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint pile in which joint portions projecting laterally from the body are provided at appropriate intervals along the axial direction. This invention relates to a knotted pile driving method in which jointed piles are driven into the ground.

[Conventional technology]

Conventionally, two methods have been used to drive knotted piles into the ground.

One method is to set a knotted pile on the ground into which it is to be driven, and drive the knotted pile into the ground by applying a striking force to the knotted pile by a hammer that falls under its own weight or is forcibly accelerated. The other method is to drill a vertical hole in the ground into which the knotted pile is to be driven, with a diameter larger than the body of the knotted pile and smaller than the knot, and then insert the knotted pile into the vertical hole. This is a static pressure press-in method in which the material is pressed into place using pressure.

When such a construction method is adopted, as the joint piles are driven, the ground around the joint piles is compacted by the joints, and a mixture of sand and cement is mixed around the joint piles on the ground. When a filler such as gravel or crushed stone is supplied, the filler is drawn into the ground by the downward movement of the joint of the knot pile and compacted tightly around the joint pile.

[Problem to be solved by the invention]

However, among the above-mentioned construction methods, when the impact construction method is adopted, it is inevitably accompanied by large noise and vibration, and there are often restrictions on the construction location and time of such construction method, and there are also When the press-in method is used, noise and vibration can be suppressed to an acceptable level, but it is difficult to achieve the same level of compaction effect for the ground and filling as with the percussion method.
Moreover, since it is necessary to drill a vertical hole in advance, the construction requires time and effort, which poses a problem in terms of construction efficiency.

In view of these points, the present invention makes it possible to improve the compaction effect of the ground and filler while suppressing noise and vibration as much as possible, and also to efficiently drive knotted piles into the ground. The purpose of this invention is to provide a knotted pile driving method that makes it possible to perform joint pile driving.

[Means to solve the problem]

In order to solve the above-mentioned purpose, the inventors of the present application conducted extensive research and found that by driving the joint pile into the ground while vibrating it vertically with a relatively high frequency and a certain amplitude, the above-mentioned object could be solved. I discovered that it is possible to vaguely forget the purpose.

The knotted pile driving method according to the present invention was developed based on such new knowledge and consideration based on it, and is basically based on the form of the knotted pile and the condition of the ground in which it is to be driven. The node pile is driven into the ground while applying vertical vibration with a predetermined frequency and amplitude to the node pile,
In this case, the frequency and amplitude can be set based on experiments or data obtained during actual construction.

In addition, when driving knotted piles, we use the vibration of the knotted pile and the downward movement of each joint to insert filler such as a mixture of sand and cement, gravel, or crushed stone between the knotted pile and the ground. It is desirable to fill the piles, and when driving knotted piles, it is possible to use an already developed vibratory pile driver with variable vibration frequency and amplitude.

[Effect]

According to the knotted pile driving method of the present invention having the above-mentioned configuration, the generation of noise and vibration is suppressed compared to the hammer method, and high-frequency vibrations are difficult to propagate through the ground, making construction easier. Restrictions on location and time can be reduced compared to hammer construction methods.

Furthermore, since the joint piles are vibrated at a relatively high frequency, the compaction effect of the ground and filling can be obtained higher than either the impact method or the hydrostatic press-in method.

Furthermore, existing vibrating pile drivers can be used, so
Its construction does not take much time and effort, and construction efficiency is greatly improved.

〔Example〕

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

As shown in the attached drawing, the knotted pile 1 driven by an example of the knotted pile driving method according to the present invention has knotted portions 3 that protrude laterally from a body portion 1 having a circular cross section, which is constant along the axial direction. When driving the joint piles 1 into the ground 5, the joint piles 1 are first restrained by the chuck 12 of the existing vibrating pile driver 10 whose vibration frequency and amplitude are variable. The joint pile 1 is placed on the ground in a suspended state, and sand and cement are dried on the ground around the joint pile 1.

Leave the mixture to rise.

Based on data obtained in advance through experiments, etc.,
The exciter (not shown) of the vibratory pile driver 10 is operated at a frequency and amplitude determined by taking into consideration the form of the knotted pile 1, the condition of the ground 5, etc. As a result, the chuck 12 of the vibratory pile driver 1 is vibrated in the vertical direction while holding the gnarled pile 1, and while the frictional force acting on the circumferential surface of the gnarled pile 1 is kept small, the chuck 12 of the vibratory pile driver 10 is Depending on the weight and the own weight of the knotted pile 1, the knotted pile 1 is designated as A and B in the attached drawing.

As shown in C, they sink into the ground and are driven into the ground.

At this time, due to the vibration of the knotted pile 1 and the downward movement of each knotted portion 3, the filling material 4 is drawn into the ground and compacted very densely around the knotted pile.

By implementing the method of driving the knotted piles 1 as described above, the generation of noise and vibration is significantly suppressed compared to the hammering method, since the knotted piles 1 are driven using vibration. Moreover, since high-frequency vibrations are difficult to propagate through the ground, there are no significant restrictions on construction location or time, and knot piles can be constructed in urban areas or residential areas.

In addition, since the knot pile is vibrated at a relatively high frequency, the compaction effect of the ground and filling is higher than that of either the impact method or the hydrostatic press-in method, and therefore the knot pile support characteristics are extremely excellent. In addition, existing vibrating pile drivers can be used, so
There is no need for laborious and time-consuming work such as drilling vertical holes, which greatly improves construction efficiency.

〔Effect of the invention〕

As is clear from the above explanation, according to the knotted pile driving method according to the present invention, it is possible to significantly improve the compaction effect of the ground and filling while suppressing noise and vibration as much as possible. It is possible to efficiently drive knotted piles into the ground simply by using an existing vibrating pile driver, without requiring any labor-intensive and time-consuming work such as drilling vertical holes. It can make an extremely large contribution to construction.

[Brief explanation of drawings]

Figures A, B, and C are views sequentially showing a state in which an example of the knotted pile driving method according to the present invention is being implemented. In the figure, 1 is a knot pile, 2 is a body, 3 is a knot 4 is a filler, 5 is the ground, and 10 is a vibrating pile driver. 12 is a chuck. Procedural amendment (method) % formula % 1. Display of the case Patent Application No. 82922 of 1990 2. Name of the invention Pile driving method 3. Person making the amendment Relationship with the case Patent applicant address Kita, Osaka City 3-14-16 Nishitenma Ward (Nishitenma Park Building 3) Name Kencho Kobe Co., Ltd. (and 1 other person) Representative
Yutaka Mizutani 4, Agent Address: 15-7-6 Toranomon-chome, Minato-ku, Tokyo Subject of amendment (1) Detailed description of the invention in the specification (2) Brief description of the drawings in the specification Column (3) Appropriate drawings (Figure 1) 7. Contents of amendment (1) On page 6 of the specification, lines 18-19, the phrase “A, B, C of the attached drawings” has been replaced with “A, B, C of the attached drawings”. In Figure 1, A, B, and C, please correct this. (2) “Figure A, Figure B, and Figure C” on page 8, line 12 of the specification
, correct J to read ``Figure 1 A, B, and C are''. (3) As per attached sheet

Claims (1)

[Claims] 1. The form of the joint pile and how it should be driven into the joint pile, in which joint parts projecting laterally from the trunk are provided at appropriate intervals along the axial direction. A knotted pile driving method characterized by driving the knotted pile into the ground while applying vertical vibration with a frequency and amplitude determined based on the condition of the ground. 2.Using the vibration of the joint pile and the downward movement of each joint,
2. The knotted pile driving method according to claim 1, wherein the knotted pile is driven into the ground while filling a filler such as a mixture of sand and cement, gravel, or crushed stone between the knotted pile and the ground. 3. The knotted pile driving method according to claim 1, characterized in that the knotted pile is driven into the ground while applying vibration to the knotted pile using a vibrating pile driver whose vibration frequency and amplitude are variable.