JP2006299557A - Method for apparatus for impact type compaction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus, which bring about the efficient high-density compaction of a viscous material to be compacted, particularly, such as bentonite. <P>SOLUTION: In the impact type compaction method, the material to be compacted is compacted by randomly reciprocating each of a plurality of compaction rods where a compacting surface with an area large enough to prevent the destruction of the material to be compacted is formed at its leading end, depending on a driving force of a driving source of a reciprocating mechanism; an edge, at a leading end in the traveling direction of a moving machine body, of the compacting surface is retreated along the returning route of a reciprocating motion at least until it is flush with a surface of the material-to-be-compacted before the compaction; and the reciprocating motion is repeated while the plurality of compaction rods are simultaneously moved in the traveling direction of the machine body, so that compacting operations can be continuously performed by using an impact force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compacting method and apparatus for compacting a material that is difficult to compact, for example, a material having viscosity such as bentonite.

Conventionally, a large compaction device such as a vibration roller, a load roller, or a tire roller has been widely used as a compaction device in a wide range of construction sites.
In addition, small compaction devices such as vibration compactors, tampers, and rammers are used in confined or relatively small construction sites where the large devices cannot work.
All of the above compaction devices are suitable for compacting flat ground, but it is extremely difficult or almost impossible to compact slopes and vertical surfaces.

On the other hand, in a radioactive waste burial facility, high density bentonite is constructed on the entire periphery of the burial facility for the purpose of water shielding.
In many cases, the radioactive waste burial facility is a tunnel built in bedrock. In this case, the large compaction device such as a vibration roller, a road roller, a tire roller, etc. is a narrow part after the construction of the structure. In the lower part of the ceiling, it is impossible to operate.
On the other hand, the above-described vibration compactor, tamper, and rammer are devices that strike the vicinity of the surface of a material with a flat plate having a relatively large area. Since bentonite is a viscous material, when these devices are used, a film in which gas is difficult to permeate is formed on the surface of the material, and air contained in the entire material below the film including the material film is released to the outside. I can't. For this reason, bentonite which is a material to be compacted cannot be compacted with high density. In addition, since the vicinity of the surface of the viscous material is pressed and compacted, it is difficult to reach a deep portion and it is necessary to operate for a very long time.

Therefore, the present inventors use a suspension device for a hardened material comprising a main body base, a plurality of tamping rods that are reciprocally movable from the main body base, and a drive mechanism for reciprocating the rod. The invention proposes a compacting method in which the cured material is compacted by pressing the compacted material while applying an impact force with the tamping rod of a suspension device, and a patent application has been filed.
However, this compaction method is a method of stopping the compaction device and compacting by pressing (pressing) the compacted portion against the compacted material while applying an impact force by a reciprocating tamping rod. Therefore, the compaction operation is repeatedly performed intermittently, and although a predetermined value can be obtained as the compaction density of bentonite, the work efficiency is not satisfactory.
The present invention has been made in view of the above circumstances, and has an object to provide a method and an apparatus for compacting a compacted material having viscosity such as bentonite with high density and efficiency. To do.
Japanese Patent Application No. 2003-360420

In order to solve the above problems, the compaction method of the present invention according to claim 1 comprises:
A plurality of ramming rods, each of which has a ramming surface with an area that does not destroy the material to be ramified, is reciprocated at random and tightened according to the driving force of the driving source of the reciprocating mechanism at the tip. In the return path of the reciprocating motion, the solidifying material is compacted, and the leading edge in the traveling direction of the moving body of the compacting surface is retracted at least until it is flush with the surface before compacting of the compacted material, The reciprocating motion was repeated while moving the tamping rods in the airframe traveling direction all at once, and the tamping operation by impact force was continuously executed.

The compaction method of the present invention according to claim 2 comprises:
The material to be compacted is a viscous material having viscosity such as bentonite that is difficult to compact. It is squeezed out into the mold and compacted, and this squeezing and compacting process is repeated in order to prevent impermeable walls. It was decided to form a layer.

The compaction method of the present invention according to claim 3 comprises:
When the tamped surface formed at the tip of the tamping rod is a smooth surface, and all the ramming rods ramify the compacted material, the tamped surface formed on the compacted material covers the entire surface. It was decided to be a plane with almost no gap.

A compaction device according to a fourth aspect of the present invention comprises:
A mobile body capable of traveling, a cylinder attached to the base of the mobile body through a height position adjusting means, one end of which is opened, and compressed air is supplied to the cylinder upper chamber and the cylinder lower chamber in the cylinder. A striking element that reciprocates by a striking element driving means that alternately supplies and exhausts, a front head that includes a plurality of through holes formed in a columnar body in the axial direction, and is attached to an open end of the cylinder, and the plurality A plurality of ramming rods, each of which is arranged in a through-hole of a book, and retreats to project a base part thereof into the cylinder lower chamber while reciprocating with a tip part projecting from the front head; Each of the plurality of tamping rods is formed at the tip according to the driving force of the driving source of the reciprocating mechanism and destroys the material to be compacted. A rod formed with a ramming surface having an unoccupied area, and a sliding member having a diameter larger than that of the rod and reciprocating while contacting the inner wall of the through-hole, and adjusting the height position The means is that the height position of the cylinder is such that the leading edge in the traveling direction of the moving body of the compaction surface is at least flush with the surface of the compacted material before compaction at the retracted position of the compaction rod. After the adjustment, the level is maintained, and the ramming rod driving means is configured to move backward so that the sliding member reaches the bottom dead center and is retracted by the air compressed by the sliding member in the through hole. And a forward drive means for striking the base of the compaction rod projecting into the cylinder lower chamber when the sliding member is located at the top dead center, and each compaction rod is the compaction Rod drive By repeating the random reciprocating motion independently by means, the tamped surface of the rod is pressed into the compacted material by impact force, and the tamped surface is compacted while forming a compacted surface on the compacted material. While the operation was repeatedly performed, the mobile body was an impact compaction device that continuously traveled while maintaining the height position of the cylinder at a constant level by the height position adjusting means.

The compaction device of the present invention according to claim 5 comprises:
A plurality of cylinders are connected in a direction perpendicular to the traveling direction of the mobile body, and a smooth plate is attached to the tip of each of the plurality of tamping rods, and the gap between the smooth plates is minute.

The compaction device of the present invention according to claim 6 comprises:
In the height position adjusting means, the height position of the cylinder is such that the leading edge in the traveling direction of the moving body of the compaction surface at the retracted position of the compaction rod is at least the surface before compaction of the compacted material. After adjusting to be flush, the level was kept at a constant level following the surface height of the compacted material.

  According to the first aspect of the present invention, the plurality of ramming rods each having a ramming surface having an area corresponding to the driving force of the driving source of the reciprocating mechanism and not destroying the material to be compacted are formed at the tip. Reciprocating each other randomly to squeeze the compacted material, and at the return path of the reciprocating motion, at least the leading edge of the squeezed surface in the traveling direction of the moving body is at least the surface before compacting of the compacted material. The reciprocating motion is repeated while moving the plurality of tamping rods in the airframe traveling direction all at once, and the tamping operation by impact force is continuously executed. The material can be compacted continuously while discharging the internal air from the material, so that the material to be compacted can be uniformly densified to the deep part, and the compacting operation can be simplified and made more efficient. It can be.

  According to the second aspect of the present invention, the material to be compacted is a viscous material having viscosity such as bentonite, which is difficult to compact, and is squeezed out into the mold and compacted. Since the wall-like impermeable layer is formed by sequentially repeating the hardening process, the wall-like impermeable layer of bentonite can be easily and quickly formed.

  According to the third aspect of the present invention, when the tamped surface formed at the tip of the ramming rod is a smooth surface, and all the ramming rods ramify the material to be compacted, the material to be compacted becomes Since the formed tamped surface is flat with almost no gap over the entire surface, the finished surface becomes smooth in combination with continuous compaction.

  According to the fourth aspect of the present invention, a mobile machine body that can travel, a cylinder that is attached to a machine base of the mobile machine body through a height position adjusting means, and one end of which is opened, and a cylinder that is disposed inside the cylinder, An open end of the cylinder, comprising an impactor that reciprocates by an impactor drive means for alternately supplying and exhausting compressed air to and from the upper chamber and the lower chamber of the cylinder, and a plurality of through holes formed in the axial direction in the columnar body. The front head mounted on the part and the plurality of through holes are respectively disposed, retreat and reciprocate with the base part protruding into the cylinder lower chamber while the tip part protrudes from the front head. An impact-type compaction device comprising a plurality of tamping rods composed of rods, each of the plurality of ramming rods responding to the driving force of the drive source of the reciprocating motion mechanism at the tip. And a rod formed with a tamped surface having an area that does not destroy the compacted material, and a sliding member that is reciprocally moved in contact with the inner wall of the through-hole having a diameter larger than that of the rod in the middle of the rod. And the height position adjusting means is configured such that the height position of the cylinder is such that the leading edge in the traveling direction of the mobile body of the ramming surface in the retracted position of the ramming rod is at least the compaction of the material to be compacted. After adjusting to be flush with the front surface, the level of the ramming rod driving means is adjusted by the sliding member within the through hole. Retreat drive means for retreating by compressed air, and advance drive means for striking the base of the tamping rod protruding into the cylinder lower chamber when the sliding member is located at the top dead center. The above When the moving member is located at the top dead center, it comprises the striking element for striking the base of the compaction rod protruding into the lower chamber of the cylinder, and each compaction rod is independently randomized by the compaction rod driving means. The reciprocating motion is repeated, and the ramming surface of the rod is pressed into the compacted material by impact force, and the tamped surface repeatedly performs a compacting operation while forming a compacted surface on the compacted material. Meanwhile, since the mobile body is an impact-type compacting device that continuously runs while maintaining the height position of the cylinder at a certain level by the height position adjusting means, the internal air is discharged from the compacted material. However, since the compaction can be performed continuously, the material to be compacted can be uniformly densified up to a deep portion, and the compacting operation can be simplified and made efficient.

  According to the fifth aspect of the present invention, a plurality of cylinders are connected in a direction orthogonal to the traveling direction of the mobile body, and a smooth plate is attached to each tip of the plurality of tamping rods. Since the gap is very small, the compacting operation can be made more efficient and the finished surface can be flattened.

According to the sixth aspect of the present invention, the height position adjusting means is configured such that the height position of the cylinder is such that the leading edge in the traveling direction of the mobile body of the compacted surface is the retracted position of the compacted rod. After adjusting the surface of the compacted material so that it is flush with the surface before compaction, the level is kept at a constant level following the surface height of the compacted material. Even if there is land, the material can be firmly solidified and compacted.
If the height position adjusting means is constituted by a pneumatic cylinder, and the height of the cylinder having the striker is held in a biased state toward the material, the height position adjusting means can be realized with a simple configuration. .

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view and a side view of an impact-type compacting device in which a compacting device 10 is mounted on a swivelable mobile body A, and FIG. 2 is a diagram showing the compacting device 10 mounted on a construction machine B equipped with a boom C. FIG. 3 is a side view of the impact compaction device in which the compaction device 10 is mounted on the XY direction moving device D, and FIG. 4 is a longitudinal sectional view of an embodiment of the compaction device 10. It is.

As shown in FIG. 1, the present invention is an embodiment in which a compacting device 10 is mounted on a swivelable mobile body A that can be supplied with compressed air, and a construction that is equipped with a boom C as shown in FIG. There is a mode in which the compacting device 10 is mounted on the machine B, and a mode in which the compacting device 10 is mounted on the XY direction moving device D as shown in FIG.
In any aspect, it has a height position adjusting means capable of adjusting the height of the compacting device 10 with respect to the mobile body.
1 and 3, the height of the compacting device 10 is adjusted by operating the hydraulic cylinder S up and down, and in the mode shown in FIG. 2, the boom C is operated up and down. To adjust the height of the compacting device 10.
At that time, the height of the tip of the retracted tamping rod is adjusted to be higher than at least the height of the squeezed material to be compacted.
The tamping surface of the tamping rod is not limited to a horizontal plane, but as shown in FIG. In this case, the leading edge in the traveling direction of the mobile body on the tamping surface may be adjusted to be higher than the height of the squeezed material to be compacted.
Since the present invention is characterized by the compaction device 10, its configuration will be described in detail below.

The compacting device 10 includes a cylindrical cylinder 41 whose one end is open, a cylindrical striker 42 that is reciprocated by air pressure inside the cylinder 41, and a cylindrical cylinder. 41, a front head 20 fixed to the open end of 41, a tamping rod 30 provided so as to be capable of reciprocating within the front head 20, and a compressor for supplying compressed air (not shown) Z)) is the main part. In the compaction operation using the tamping rod, the height is not normally changed.
However, if there is unevenness on the surface of the material to be compacted, it will not be possible to follow a small depression, and the compaction of the material of the depression will be insufficient.
In order to cope with this, it is effective to keep the level of the compacting device following the surface height of the material to be compacted.
For this purpose, the height position adjusting cylinder S shown in FIGS. 1 and 3 is driven by air pressure, and the height position of the compacting device 10 is moved to the retracted position of the compaction rod. After adjusting the leading edge of A in the traveling direction to be at least flush with the surface before compaction of the compacted material, the compaction device 10 is urged to press the compacted material with a weak force. The air pressure of the height position adjusting cylinder S may be adjusted so that the height of the compacting device 10 follows the surface height of the material to be compacted and the constant height is maintained from the surface of the undulating material.
If it does in this way, the air which has the pressure in a cylinder will change in volume elastically, and it will be able to follow unevenness.

Referring to FIG. 4, the front head 20 is formed in a substantially cylindrical shape that is solid. In the axial direction of the front head 20, six through holes 20 a for penetrating the front head 20 and inserting the tamping rod 30 are provided. The through holes 20 a are provided so as to be positioned at substantially equal angles in the cross-sectional direction of the front head 20.
The number of through holes may be any number as long as it is plural, but is preferably four or more.

The tamping rod 30 is formed of a substantially cylindrical rod 33 and a tamping rod body 31 attached to the tip of the rod 33.
Each rod 33 is inserted into the through hole 20 a of the front head 20, and the base portion can protrude into the lower chamber of the cylinder 41. And each tamping rod 30 can reciprocate along the said through-hole 20a by being struck by the front-end | tip part of the striker 42. FIG.
The tamping rod body 31 attached to the tip of each rod 33 is configured such that six smooth plates 35 having a triangular shape are provided at the tip.

The smooth plate 35 has a larger area than the cross-sectional area of the tip of the substantially cylindrical rod 33 itself. When the rods 33 are arranged on the same plane, the smooth plate 35 is located between the six smooth plates 35. There is almost no gap between them, and they are attached in a regular hexagonal shape.
The tamping rod 30 is struck by the striker 42 and moves forward to ramify the material to be compacted, so it needs to be driven reliably.
For this reason, the area of each smooth plate 35 is determined according to the driving force of the reciprocating drive mechanism of the tamping rod 30 described later.
Further, the area of each smooth plate 35 is such that the material to be compacted is not destroyed, that is, the advancement of the tamping rod 30 scatters the material to be compacted and the material cannot be compacted only by being disturbed. It is set not to be
Reinforcing ribs 36 are provided in the axial direction on each side of the smooth plate 35.

  If such a compaction device 10 is used, an impact load can be applied uniformly over the entire range of the material to be compacted by the flat plate 35 having a large area, so that compaction can be ensured. It can be done and the compaction surface can be smoothed.

A bush presser 22, which is a disk in which a circular hole 22 a having the same shape as the through hole 20 a is formed, is attached to the front surface of the front head 20 by a hexagonal bolt 24. A chisel bushing 23 is interposed between the through hole 20 a of the front head 20 and the circular hole 22 a of the bush presser 22.
Reference numeral 34 denotes a sliding member that is provided in the middle of the rod 33 and slides inside the through hole 20a.
A compressed air supply hole 47 communicating with the inside of the cylinder 41 is provided at a substantially intermediate height position in the side surface portion of the cylinder 41 so as to protrude. The compressor is connected to a compressed air supply hole 47 via a connection hose (not shown), and can supply compressed air as a drive source to the cylinder 41 and the empty chamber 56 of the front head 20. Yes.
Further, the rear end portion of the cylinder 41 is closed by a back head 43 having a substantially convex cross section by a plurality of side bolts 44 and side bolt nuts 45. The front end portion of the side bolt 44 is screwed into the front head 20, and the front head 20 and the cylinder 41 are integrated.

  The striker 42 is formed with an insertion hole 42a from the rear end portion to a predetermined position so that the front end portion of the back head 43 can be inserted therein.

The cylinder 41 is partitioned into an upper chamber 52 and a lower chamber with the striking element 42 interposed therebetween. The striking element 42 has an air passage 53 for introducing compressed air into the upper chamber 52 and a striking element 42 below the air passage 53. A vent passage 54 for discharging the compressed air in the upper chamber 52 is formed at a position shifted in the circumferential direction. Further, an annular groove for introducing compressed air when the striker 42 is raised is formed above the outer wall of the striker 42.
On the other hand, on the inner wall of the cylinder 41, a compressed air introduction path 55 for raising the striker 42, a compressed air introduction path 56 for lowering the striker 42, and a discharge path for discharging air when the striker 42 rises, in order from the top. 57 are each formed in the form of an annular groove.

Hereinafter, an example of compacting bentonite will be described.
With the above configuration, immediately before the striker 42 reaches the top dead center, high-pressure compressed air is introduced into the upper chamber 52 from the compressed air introduction path 56 and the ventilation path 53, and the striker 42 is moved downward to show a broken line. Move down to the position indicated by. At this time, the striker 42 strikes the base of the tamping rod 30. Then, the tamping rod 30 suddenly moves from the left side of FIG. 4 to the right side of the figure, and a material of about 160 mm thick newly struck on the already struck material is squeezed. The height of the surface is lowered by about 40 to 50 mm. The drive mechanism of the tamping rod 30 will be described later.
The lower chamber of the cylinder 41 does not have a structure for exhaust. For this reason, when the striker 42 is moving downward, the air in the lower chamber of the cylinder 41 is compressed and stores a force for elastically pushing back the striker 42 upward.
And just before the striker 42 reaches the bottom dead center, the air passage 54 for discharging the compressed air in the upper chamber 52 communicates with the discharge passage 57 to discharge the compressed air in the upper chamber 52 of the cylinder 41, The inside of the empty room 56 is depressurized. At substantially the same time, the compressed air introduction passage 55 for raising the striker 42 formed on the inner wall of the cylinder 41 communicates and moves the striker 42 upward in cooperation with the compressed air in the cylinder lower chamber.
The striker 42 reaches top dead center and repeats the above operation.
The striker 42 is driven by the above striker drive mechanism and moves up and down at a speed exceeding, for example, 1500 rpm / min.

Next, the drive mechanism of the tamping rod 30 will be described.
The striker 42 strikes the base of the tamping rod 30 and moves the rod downward. At this time, the sliding member 34 reaches the bottom dead center while compressing the air in the empty chamber 56 and increasing the pressure in the empty chamber 56. As a result, the ramming rod 30 is moved upward by the pressure of the compressed air in the vacant chamber 56, and the state of the left side in FIG. 4 is the position of the top dead center where the base of the rod protrudes into the lower chamber of the cylinder 41. And wait for the next striker 42 to be struck.
If the space between the tamping rod 30 and the chisel bushing 23 is airtight, the ramming rod 30 can be moved up only by the air pressure in the vacant space 56, but in reality, a gap is formed between them due to wear or the like. An annular groove is formed on the inner wall of the cylinder 41. This annular groove functions as a compressed air introduction path 59 for moving the tamping rod 30 upward, and introduces compressed air into the vacant chamber 56 to forcibly project in addition to the automatic pressure increase due to the downward movement. It is also effective to drive the compacting rod 30.
The time required for one stroke of the tamping rod 30 is considerably longer than that of the striker 42. Further, the time required for one stroke of each tamping rod 30 varies depending on each stroke.
For this reason, the reciprocating motion of each tamping rod 30 has no regularity and moves at random.
Since the stroke of the tamping rod 30 has a stroke of about 85 mm, it can be retracted to a position sufficiently higher than the newly ground material surface. For this reason, it is possible to ram the impact type compaction device while continuously running it.

Next, a compaction method using the impact compaction device will be described.
First, the compacted material is ground to a desired location for about 160 mm.
Subsequently, while running the impact type compaction device at a speed of about 2 km / h, an impact force is applied by the tamping rod body 31 to operate the tamping rod body 31 over the entire area to be compacted. As a result, all the compacted materials can be compacted. According to this work, since the air inside the compacted material is continuously and quickly discharged by the impact force of the tamping rod body 31 of the compacting device 10, the compacted material is brought to a deep part. It is possible to increase the density uniformly and efficiently.
By this operation, the thickness of the compacted material that has been averaged by about 160 mm is preliminarily compacted to a thickness of about 120 to 110 mm.
Instead of this preliminary compaction work, preliminary compaction may be performed by rolling with a compaction roller. In this case, the thickness of the compacted material that has been averaged by about 160 mm is compacted to a thickness of about 110 mm.

Next, a final finishing compaction operation is performed.
The content of the compacting operation is the same as that of the preliminary compacting operation described above, but the traveling speed is 0.05 to 0.1 km / h.
By this operation, the thickness of the compacted material that has been averaged by about 160 mm is compacted to a thickness of about 100 mm, and compacted to a predetermined density of 1.6 g / cm ³ .
In addition, in the case of performing the above-described operation, an example in which the compacting operation is performed while the amount of the compacted material suitable for compacting is gradually squeezed, etc., is explained. It is also possible to carry out the entire compaction work after squeezing and smoothing.
Further, when applying the impact compaction method of the present invention, not only when the portion to be compacted has a linear boundary surface, but also a circular, elliptical or other curved boundary surface. It is applicable even in the case of a part having it.
That is, when compacting a portion having a curved boundary, the material to be compacted is compacted while the tamping rod body 31 of the compacting device 10 is spirally swung along the boundary. It can be carried out.
In addition, surfaces that slope at the corners of vertical walls and horizontal floors may be compacted.
In this case, the machine frame to which the compaction device 10 is attached is turned 90 degrees, and the compaction device 10 located in front of the traveling direction is positioned on the side in the traveling direction to perform the compacting operation.

Thus, since the present invention is an excellent impact compaction method and apparatus, it can be applied to compaction of various civil engineering materials and building materials.
For example, according to the present invention, it is possible to suitably compact a high-density bentonite constructed for the purpose of water shielding over the entire outer periphery of a radioactive waste burying facility. In other words, because bentonite has viscosity, it is difficult to compact when it is compacted by using a compacting device such as a conventional tamper, and it is necessary to operate for a very long time. However, the device may be broken due to impact force and reaction force acting on the device. However, in the present invention, the bentonite can be uniformly densified because compaction is performed using a device designed to have a long-term durability against a large impact force.

  In addition, the present invention is not only applied to compaction in the field, but after the compaction material is put into a mold of a predetermined size, compaction is performed using an impact compaction device, and a precast product ( It can also be applied when manufacturing and using blocks.

Furthermore, since the impact compaction device can be reduced in size, it can be used by being attached to the backhoe B or the like (other various traveling devices). Therefore, if the backhoe B and the like are automatically controlled, it is possible to perform automated construction, and it is particularly effective in a narrow part where it has been difficult to use a compaction machine and construction is difficult.
Further, since the impact compaction device is driven by compressed air, it can be applied regardless of the construction site as long as a compressor for supplying compressed air can be connected.

  As mentioned above, although an example about a suitable embodiment was explained about the present invention, the present invention is not restricted to the embodiment concerned, and a design change is possible suitably in the range which does not deviate from the meaning of the present invention.

(A) is a top view which shows an impact type compaction apparatus, (b) is the same side view. It is a side view which shows the impact type compaction apparatus attached to the backhoe. It is a side view which shows the impact type compaction apparatus attached to the XY direction moving apparatus. It is a figure which shows the Example of a compaction apparatus, (a) is sectional drawing, (b) is a X direction arrow directional view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Compaction apparatus 20 Front head 22 Bush presser 30 Clamping rod 31 Clamping rod body 33 Clamping rod 34 Sliding member 35 Smooth plate 40 Clamping rod drive mechanism 41 Cylinder 42 Stroke 50 Water injection mechanism A Mobile machine body B Backhoe C Boom D XY direction moving device S Height position adjustment cylinder

Claims (6)

  A plurality of ramming rods, each of which has a ramming surface with an area that does not destroy the material to be ramified, is reciprocated at random and tightened according to the driving force of the driving source of the reciprocating mechanism at the tip. In the return path of the reciprocating motion, the solidifying material is compacted, and the leading edge in the traveling direction of the moving body of the compacting surface is retracted at least until it is flush with the surface before compacting of the compacted material, An impact-type compaction method in which the reciprocating motion is repeated while moving the tamping rods all at once in the airframe traveling direction, and the tamping operation by the impact force is continuously executed.   The material to be compacted is a viscous material having viscosity such as bentonite, which is difficult to compact, and is squeezed into a mold to be compacted. 2. The impact-type compaction method according to claim 1, which is a compaction method for forming a water-permeable layer.   The tamped surface formed at the tip of the tamping rod is a smooth surface, and when the rammed rods all rammed the compacted material, the tamped surface formed on the compacted material is 3. The impact-type compaction method according to claim 1, wherein the entire surface is flat without a gap. A mobile body capable of traveling;
A cylinder that is attached to the base of the mobile body via a height position adjusting means and that is open at one end;
A striking element reciprocating by a striking element driving means for alternately supplying and exhausting compressed air to and from the cylinder upper chamber and the cylinder lower chamber,
A front head provided with a plurality of through-holes formed in a columnar body in an axial direction and attached to an open end of the cylinder;
A plurality of tamping rods, each of which is arranged in the plurality of through-holes, and is made of a rod that retreats and reciprocates with its base portion protruding into the cylinder lower chamber and a tip portion protruding from the front head. When,
An impact compaction device comprising:
Each of the plurality of ramming rods includes a rod having a ramming surface formed at an end thereof in accordance with a driving force of a driving source of a reciprocating motion mechanism and having an area that does not destroy a material to be compacted. It is equipped with a sliding member that reciprocates while being in contact with the inner wall of the through hole that is larger in diameter than the rod in the middle.
In the height position adjusting means, the height position of the cylinder is such that the leading edge in the traveling direction of the moving body of the compaction surface at the retracted position of the compaction rod is at least the surface before compaction of the compacted material. After adjusting to be flush, keep that level,
The ramming rod driving means includes a retraction driving means for causing the sliding member to reach a bottom dead center and retreating by air compressed by the sliding member in the through hole, and the sliding member When located at the dead center, the striking element comprises forward drive means for striking the base of the compaction rod protruding into the cylinder lower chamber,
Each ramming rod repeats a random reciprocating motion independently by the ramming rod driving means, and the ramming surface of the rod is press-fitted into the material to be compacted by impact force, and the surface of the tamping surface is compacted. While the ramming operation is repeatedly performed while the ramming surface is formed, the mobile body continuously travels while maintaining the height position of the cylinder at a constant level by the height position adjusting means. Compaction device.   A plurality of the cylinders are connected in a direction perpendicular to the traveling direction of the mobile body, a smooth plate is attached to each tip of the plurality of tamping rods, and a gap between the smooth plates is minute. An impact compaction device according to claim 5, characterized in that   In the height position adjusting means, the height position of the cylinder is such that the leading edge in the traveling direction of the moving body of the compaction surface at the retracted position of the compaction rod is at least the surface before compaction of the compacted material. The impact type according to any one of claims 4 to 5, wherein the level is adjusted to be flush with the level of the surface of the material to be compacted and maintained at a constant level. Compaction device.