JPH05339933A - Vibration compactor - Google Patents

Abstract

PURPOSE:To increase penetration efficiency of a vibro-flot, by ejecting compressed air to the whole periphery of the front end of a vibration compactor penetrating the device by ejecting compressed air to help promote the penetration by compressed air and efficiently remove sand or the like at the periphery of the front end of the vibrator. CONSTITUTION:A vibration compactor 10 is composed of a vibrator 20, a rod 40, an isolator 30. In the vibrator 20, air jet 70 as compressed air for excavation is ejected from the air blowing opening 26 at the front end and air jet 70' as dispersing compressed air is ejected respectively from a couple of air blowing pipes 24 at the periphery of the front end as a part of dispersing means of compressed air, equipped at the opposite position on the outer peripheral plane of the ejecting opening at the front end, in order to help penetration of the vibration device by air jet 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration compactor for compacting soft ground such as loose sandy ground.

[0002]

2. Description of the Related Art As one of the conventional methods for improving soft ground, especially for loose sand, a vibrofloatation method using a vibrating compaction device called a vibroflot consisting of a vibrating section and a rod section is known. Are known. This construction method vibrates the vibrating section and jets jet water from the tip of the vibrating section to penetrate the vibro flot into the ground,
In addition, the stuffing material such as crushed stone and gravel is pulled out while being put in to compact the surrounding ground and form pillars of the stuffing material in the ground. The pillars are arranged at predetermined intervals to compact the entire ground.

However, since the apparatus used in the above-mentioned vibro-floatation method uses a large amount of jet water jetted from the tip portion, a large amount of muddy water is generated during construction, and its treatment is very expensive. At the same time, there was a problem that a facility for supplying water was required.
Further, in the vibro flotation method, the space between the hole wall and the vibro flot is filled with water discharged while holding the hole wall. Also flows out with water. Therefore, there is a problem that only a material having a large particle size such as crushed stone or gravel can be used as the filling material.

Therefore, in order to solve the above-mentioned problems, an air supply pipe for cutting is provided at the tip of the vibrating portion, and an air supply pipe for holding the hole wall is provided on the outer periphery of the vibrating portion to inject compressed air. A vibro flotation device has been proposed which penetrates the vibro flot while holding the hole wall.

[0005]

However, in the above-mentioned vibroflotation device, the compressed air for excavation ejected from the tip portion of the vibrating portion is only ejected in the direction in which the vibroflot penetrates. Therefore, there is a problem that diffusion of the hole wall and supply of a replenishing material such as sand to the hole bottom in the peripheral region of the tip are not sufficient, resulting in poor penetration efficiency of the vibro flot.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to inject compressed air around the entire compressed air for excavation and to remove sand or the like at the hole bottom in the peripheral region of the tip portion. An object of the present invention is to provide a vibration compaction device that can be efficiently supplied and that has excellent penetration efficiency of a vibro flot.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above object, and its gist is to provide a tip end compressed air supply means for injecting compressed air for excavation to penetrate the apparatus. A vibrating section, and a rod section connected to the vibrating section,
A vibration compaction device, which is disposed on the outer periphery of the vibrating portion and includes an outer peripheral compressed air supply means for injecting compressed air for holding a hole wall, wherein the excavation device is provided outside the tip compressed air supply means. A vibration compaction device characterized by comprising compressed air diffusing means for injecting compressed compressed air for assisting penetration of compressed air.

Here, the vibrating section is an oscillating device having a built-in eccentric load and driven by a motor. The rod portion is a columnar member made of a steel pipe or the like, and is a member whose length can be adjusted by adding as necessary.

The shape and material of the compressed air diffusing means are not particularly limited as long as the compressed air is injected not only in the penetration direction of the device but also in the entire tip portion of the vibrating portion.

[0010]

In the vibration compaction device of the present invention, first, a crane or the like is used to stand up at a predetermined position to vibrate the vibrating portion, and the compressed air for excavation is applied from the tip of the vibrating portion and the outer periphery of the vibrating portion. And the compressed air for holding the hole wall is ejected. Then, when the device is gradually moved downward, the compressed air for excavation cuts the ground, and the compressed air injected by the compressed air diffusing means causes the sand or the like in the peripheral region of the tip of the vibrating part to be pierced from the vibrating part. Remove to bottom. In addition, compressed air for holding the hole wall is supplied to the entire outer circumference of the vibrating portion to hold a gap between the device and the hole wall.

[0011]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows an oscillating compaction device 10 of the present invention. This oscillating compaction device 10 includes a vibrating portion 20, a rod portion 40 which is connected to an upper portion of the vibrating portion 20, and is interposed between them. And an isolator 30 that operates. Further, the vibration compaction device 10 includes a drilling air supply pipe (not shown) disposed inside the head section 42 of the rod part 40 to the tip of the vibrating device 21 of the vibrating part 20, the vibrating part 20, and the isolator. And an outer peripheral portion 50 arranged along the outer peripheries of the rotor 30 and the rod portion 40.

The vibrating section 20 comprises a vibrating device 21 which is a steel column member and a vibrating section rod 22. The vibration device 21 is
An eccentric weight, a hydraulic motor for driving the eccentric weight, and an excavation air supply pipe are incorporated to apply horizontal vibration to the vibrating section 20. Further, the tip air outlet 26 as a part of the tip compressed air supply means connected to the excavation air supply pipe.
In order to assist the penetration of the air jet 70 as the compressed air for excavation from the device and the device (vibration device) by the air jet 70, the compressed air is provided at a position facing each other on the outer peripheral surface of the tip air outlet. Air diffusion means 1
Air-jets 70 ', which are compressed air for diffusion, are jetted from the air blow-out pipes 24 in the peripheral region of the pair of front end portions as a part. Further, on the outer peripheral surface of the vibrating device 21 in the upper part of the air blowing pipe 24, a pair of vibrating portion fins 23 are arranged at opposing positions so as to be displaced by 90 ° in the circumferential direction with respect to the air blowing pipe 24. The vibrating rod 22 has outer peripheral air blowing pipes 25, which are a part of outer peripheral compressed air supply means for injecting an air jet 71 as compressed air for holding the hole wall, at opposite positions on the outer peripheral surface. The outer peripheral air blowing pipe 25 is arranged at 90 ° in the circumferential direction with respect to the mounting position of the pair of vibrating fins 23. An air hose 51 is attached.

The isolator 30 is a steel columnar member having an elastic member and the excavation air supply pipe inside, and is connected to the vibrating section 20 and the rod section 40 by joints 31 at the upper and lower ends thereof. Thus, a vibration insulating portion that prevents horizontal vibration of the vibrating portion 20 from being transmitted to the rod portion 40 is formed.

The rod portion 40 mainly comprises an extension pipe 41 having a digging air supply pipe inside and joints 46 at both ends, and a rod 47. At this time, the extension pipe 41 can be added if necessary. A head section for suspending the vibration compaction device 10 from the crane 61 is provided at the upper end of the extension pipe 41 with a tip end air-supply port 43 for connecting compressed air to the air-hose 55. 42 and the pulley 44 provided on the upper part thereof are attached. The rod 47 is an isolator 30 and an extension pipe 41.
Is a steel columnar member interposed between the drilling air supply pipe and the outer circumference thereof along the axial direction of the rod 47 and arranged in two rows at opposite positions of the outer circumference. Four fins 45 are welded per row. Also,
A hole wall holding air supply port 52, to which an air hose 55 is connected, is installed at an opposite position on the outer circumference of the rod portion 40, and the hole wall holding air supply port 52 is flexible. Two hole wall holding air pipes 50 each having a high pressure air hose 51 are attached. Flexible high pressure air hose 5
Since No. 1 is arranged across the joint 31 of the vibrating portion 20 and the isolator 30, the vibration of the vibrating portion 20 is not transmitted to the hole wall holding air pipe 50. The two rows of fins 45 arranged on the outer circumference of the rod 47 are
It is arranged on the same plane as 3, that is, at the same position in the circumferential direction, and is displaced by 90 ° in the circumferential direction with respect to the two hole wall holding air pipes 50.

Next, the air blowing pipe 2 around the tip end portion
4 is explained in detail, FIG.
2B is a front enlarged view of FIG.
FIG. 2C is a BB sectional view thereof. The air blow-out pipe 24 has a taper portion 81 protruding outward at a tip end thereof, a semi-elliptical notch 82 provided above a central portion of an end of the taper portion 81, and a taper portion 81.
Has an egg-shaped build-up portion 83 protruding from the inner surface of the tip end portion corresponding to. As a result, the air jet 70 'ejected from the air blowing pipe 24 is supplied to the entire peripheral region of the air jet 70 ejected in the direction of each arrow and ejected from the tip portion of the vibrating portion.

Next, a vibration compaction method using the apparatus of the present invention will be described with reference to FIGS. 3 (a) to 3 (d). First, the pile core is set at a predetermined position to vibrate the vibrating section 20, and at the same time, the tip air outlet 26 of the vibrating section 20 is
An air jet 70 for excavation that penetrates the vibration compaction device from the air blowing pipe 24 in the peripheral region of the tip portion and the air blowing pipe 25 in the outer peripheral region, and an air jet 70 'and a hole for ejecting from the surroundings to assist the penetration. Wall-holding air
Jets 71 are ejected respectively. As a result, the vibration compaction device 10 penetrates into the ground due to the vibration, the excavation by the air jets 70 and 70 'for excavation, and the self-weight.
(a). During the penetration, most of the sand and the like in the tip part peripheral region of the vibrating part is removed by the air jet 70 'for excavation from the air blowing pipe 24 in the tip part peripheral region, and the pressure due to the sand or the like is not applied to the vibrating part 20, Smooth penetration of equipment with air jets for excavation. Further, the action of the air jet 71 for holding the hole wall and the fins 45 of the lot section 40 widens and holds the gap 76 between the hole wall and the apparatus.
(b). When the vibration compaction device 10 penetrates to a predetermined depth, the injection amount of the air jets 70, 70 'for excavation is reduced, and the filling material 73 is put into the space 76 while the vibration compaction device 10 is being pulled out (c). ). At this time, due to the action of the air pressure by the air-jet 71 for holding the hole wall and the holding force by the fins 45, the filling material 73 dropped into the bottom 74 of the perforation 72 without causing clogging and vibrates. Compacted by. When the vibration compaction device 10 is completely withdrawn, pillars 75 of filling material are formed in the ground (d). The pillars 75 of the filling material are arranged at predetermined intervals to compact the entire ground.

[0018]

The vibration compaction device of the present invention has the compressed air diffusing means, and the compressed compressed air for diffusion is supplied from the periphery of the compressed air for excavation which penetrates the vibration compaction device to the periphery of the tip portion of the vibrating portion. Since it can be jetted over the whole area, sand or the like in the peripheral region of the tip can be efficiently discharged, and the penetration of the vibro flot can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a side view showing a vibration compaction device of the present invention.

FIG. 2 (a) is a front end peripheral region air blowing pipe 2
4 is an enlarged front view of FIG. 4, FIG. 2 (b) is its AA sectional view, and FIG. 2 (c) is its BB sectional view.

3 (a) to 3 (d) are explanatory views showing a vibration compaction method using the vibration compaction device of the present invention.

[Explanation of symbols]

 10 Vibration Compaction Device 20 Vibration Unit 21 Vibration Device 24 Tip Circumferential Area Air Blowoff Pipe 25 Peripheral Air Blowoff Pipe 26 Tip Air Blowout Port 30 Isolator 40 Rod Part 45 Fin 50 Hole Wall Holding Air Pipe 70, 70 '' Air-jet for excavation 71 Air-jet for hole wall holding 72 Perforation 73 Filling material 75 Pillar of filling material 76 Void

Claims (1)

[Claims] 1. A vibrating section provided with a tip end compressed air supply means for injecting compressed air for excavation to penetrate the apparatus, a rod section connected to the vibrating section, and an outer periphery of the vibrating section. A vibration compaction device including an outer peripheral compressed air supply means for injecting compressed air for holding a hole wall, the auxiliary compaction device further promoting penetration of the compressed air for excavation outside the tip compressed air supply means. A vibration compaction device characterized by comprising compressed air diffusion means for injecting compressed air for diffusion.