Note: Descriptions are shown in the official language in which they were submitted.
2 1 7~3
WEAK GROUND REINFORCING DRAIN STRUCTURE AND
METHOD AND APPARATUS FOR ARRANGING THE SAME
TECHNICAL FIELD
The present invention re~ates to a technology of reinforcing soft
grounds, and more particularly to a pack for molding a sand file to form a
drain, a pack guide casing for piling a pack underground, an automatic pack
pile driver which is used for piling a pack into a guide casing, and a drain
structure and an alignment method thereof.
BACKGROUND ART
A vertical draining method such as a flexible sand drain and/or a
paper drain is generally used for reinforcing a soft ground. A conventional
vertical draining method piles a cylindrical guide casing underground, inserts
a sand pack or a paper drain board into the guide casing, and then removes
the guide casing. FIG. 1 is a perspective view of a flexible sand pack and a
guide casing which are used for a conventional vertical draining method. As
shown in FIG. 1, the conventional vertical draining method is accomplished
by burying a cylindrical guide casing 10 underground, and then piling sand
pile molding pack 20 into guide casing 10. Pack 20, which is in a
matrix-type plain texture, is accomplished by overlapping two sheets of the
matrix-type plain textures, in which both ends are formed as reinforcement
portions 31 and 32 lengthwise by connecting both ends or thermally melting
them to attach to each other. The pack 20 inserted into guide casing 10 are
filled with the sands, and then guide casing 10 is removed at the
~73~3
sand-filled state to form a drain.
However, the conventional sand file molding pack has problems that
the manufacturing method is complicated and the manufacturing cost is
high. Also, there are breakage or cut-off of the pack, or some discrepancy
between latitude and longitude. Further, the conventional pack has a
problem that the reinforcement portion 31 or 32 is folded, through which a
fine soil cannot pass, and a film is formed which lowers a draining effect.
Also, since a cylindrical pack is used, a draining contact area is small to
lower a draining effect.
The conventional guide casing is formed as only a cylindrical shape, to
accordingly raise a phenomenon of twisting the pack when the pack is
inserted. Moreover, since the paper drain board is a structure of a thin plate
when the paper drain is formed, many spaces are formed therein. Thus,
removal of the casing causes to raise an excessive ground movement.
DISCLOSURE OF THE INVENTION
Therefore, to solve the above problems, it is an object of the present
invention to provide a sand pile molding pack with a simple manufacturing
process and a low manufacturing cost.
Another object of the present invention is to provide a rectangular
sand pile molding p~ck.
Yet another object of the present invention is to provide a pack in
which a flexible sand drain and a paper drain are simultaneously installed.
Still another object of the present invention is to provide a pack guide
member in which a pack is not twisted to each other.
~17~3
Still yet another object of the present invention is to provide a guide
casing which can prevent its bending when buried underground.
A further object of the present invention is to provide a casing
comprising an internal reinforcement member.
A yet further object of the present invention is to provide an
automatic pack pile driver for piling a pack into a guide casing.
A still further object of the present invention is to provide a drain
structure and an alignment method thereof in which a draining effect is
high.
To accomplish the above objects of the present invention, there is
provided a pack which is used for reinforcing a soft ground according to an
aspect of the present invention, wherein the pack is fabricated via an
injection molding.
A pack guide casing for guiding a pack which is used for reinforcing
a soft ground according to another aspect of the present invention
comprises a first member which is formed as a hollow vessel having a
predetermined length and having at least one guide path formed in the
vessel lengthwise; and a second member which is connected in the lower
end of the pack and guided by the guide path of the first member, to be
movable up and down.
A guide casing for guiding a drain board which is used for reinforcing
a soft ground according to yet another aspect of the present invention,
comprises a hollow rectangular box body having a predetermined length;
and at least one reinforcement member which is protruded in the body.
An automatic pack pile driver which is used for reinforcing a soft
~17~4~3
ground according to still another aspect of the present invention, comprises
a pack supply member having a rotatable cylindrical portion around which a
pack having a wider locker for every predetermined length is wound on the
outer surface thereof; and a pack guide member having a groove for
preventing passage of the wider locker of said pack.
A drain structure for reinforcing a soft ground according to still yet
another aspect of the present invention, is characterized by that the drain
structure is in a rectangular shape.
A drain alignment method for reinforcing a soft ground according to a
further aspect of the present invention comprises the steps of maintaining a
virtual line which connects a center line of each drain in four rectangular
drains adjacent to each other to form a square; and aligning each drain of a
length direction perpendicular to an adjacent drain lengthwise at the center.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspectlve view of a flexible pack and a gide casing for
explaining a vertical draining method.
FIGs. 2A through 2C are perspective views of a sand pile molding
pack according to one embodiment of the present invention.
FIGs. 3A through 3D are plan views of a sand pile molding pack
according to another embodiment of the present invention.
FIG. 4 is an exploded perspective view of a guide casing of a sand
pile molding pack according to one embodiment of the present invention.
FIG. 5 is a cross-sectional view of a combined state cut along a
direction of I-I of FIG. 4.
-- 4 --
~7~a3
FIG. 6 is perspective view of a second member of FIG. 4 according to
another embodiment of the present invention.
FIGs. 7A through 7F are plan views of a second member of FIG. 4
according to various embodiments of the present invention.
FIG. 8 is a plan view of a guide casing according to another
embodiment of the present invention.
FIGs. 9A through 9D are plan views of guide casings according to
different embodiments of the present invention.
FIGs. 10A and 10B are perspective views of an automatic pack pile
driver according to the present invention.
FIG. 11 is a plan view of a plurality of integrally constructed guide
casings to embody a drain aligning method according to the present
invention.
FIG. 12 is a conceptual view for explaining a drain aligning method
according to the present invention.
FIG. 13A is a perspective view of a conventional drain structure.
FIG. 13B is a perspective view of a drain structure according to the
present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinbelow, preferred embodiments of the present invention will be
described in detail with reference to the accompanying drawings.
FIGs. 2A through 2C are perspective views of a sand pile molding
pack according to one embodiment of the present invention. The pack of the
present invention is fabricated by a metal injection molding method. FIG. 2A
,_ ~170~3
is a perspective view of a sand pile molding pack 40 which is obtained by
the injection molding method without any reinforcement portions. FIG. 2B
shows a sand pile molding pack material 50 having a reinforcement 51 at
a constant interval which is obtained by the injection molding. A sand pile
molding pack 60 shown in FIG. 2C is obtained by cutting pack material 50
of FIG. 2B to include at least one reinforcement portion 51 and combining
the cut pack materials with each other.
FIGs. 3A through 3D are plan views of sand pile molding packs
according to other embodiments of the present invention. It can be seen that
the packs of the present embodiments are extended lengthwise and in the
same pattern even without showing perspective views.
FIGs. 3A and 3B show rectangular packs and FIGs. 3C and 3D show
cylindrical packs. In these embodiments, the pack includes net portions 71
and a plurality of reinforcement portions 72. The reinforcement portion 72
can be attached with a sub-texture. Thus, the packs according to these
embodiments have a merit that a flexible sand drain and a paper drain can
be simultaneously formed.
Further, since the pack is in a rectangular shape, a draining area
increases more than 30% compared with a cylindrical pack which consumes
the same amount of the sands as that of the rectangular pack. That is, the
rectangular pack has circumferential length of more than 30% at the same
area compared with the cylindrical pack. Thus, a draining effect of more
than 30% can be obtained, even though the same amount of the sands is
used.
Furthermore, the conventional flexible pack is continuously produced
-- 6 --
~i7a~
without any marking in the same shape and color, and then is measured
and cut by necessary lengths in use. The drain which is constructed by
using such a pack has an exposed portion of the same shape and color.
Thus, to ascertain whether the underground drain has been constructed up
to a target depth, construction drawings or records should be checked or it
should be measured using other equipment.
Thus, the pack of the present invention has markings which can
identify the length of the pack. That is, when the pack is produced, various
colors or figures are marked on the pack. Alternatively, reinforcement
portions having the identified patterns are made and attached to the pack,
and then it is more preferable that the identification of the length is made
by human vision. Thus, after construction, identification of the markings of
the exposed drain can make a judgement whether such a construction was
properly done. Accordingly, poor construction can be prevented, and easy
construction or effective construction control can be performed.
FIG. 4 is an exploded perspective view of a guide casing of a sand
pile molding pack according to one embodiment of the present invention. As
shown in FIG. 4, the casing of the present invention is buried by a
predetermined depth into a soft ground. The casing has a first member 80
having lengthy guiding paths 81 which are formed along the whole
lengthwise surface, and a second member 90 which is integrally combined
with sand pile molding pack P, and are moved up and down at the state
which is engaged with guide paths 81 in first member 80. Therefore, when
sand pile molding pack P is driven into first member 80, variation such as
twisting or distortion does not occur. In this embodiment, guide paths 81
217~4~3
._
are located at four positions. However, it is possible to use more than or
less than four guide paths 81. Even though guide paths 81 are shown as
protruded shapes, the guide paths can be formed in grooves if second
member 90 is modified to have the grooves therein.
Second member 90 has a predetermined width and thickness and is
formed to have a semicircular surface 92 at the area contacting the inner
circumferential surface of first member 80. By forming semicircular surface
92, second member 90 moves smoothly along the inner circumferential
surface of first member 80.
FIG. 5 is a cross-sectional view of a combined state cut along a
direction of I-I of FIG. 4. Referring to FIG. 5, one embodiment of the
installation of the present invention will be described below.
In FIG. 5, first member 80 is driven at a predetermined position into
soft ground E. Here, the lower end of first member 80 is driven in an
opening state, but the lower end thereof is actually driven in a closed state.
Also, a plurality of first members 80 are mutually connected and used
according to a target depth to install first member 80. Here, it is preferable
that guide paths 81 are linearly driven without discrepancy. Sand pile
molding pack P, which is made of a net of a flexible material and is
integrally combined with second member 90, is driven into the inside of
first member 80 which is driven underground.
It is preferable that a predetermined amount of the sands is filled into
the end of pack P prior to driving pack P into first member 80, and then
the pack P is driven into first member 80. The reason why the sands are
filled into the end of the pack P is for swiftly and accurately driving pack
4 0 3
P up to a target depth of first member 80 due to the weight of the sands.
Other weight materials can be used as weight balance instead of the sands.
In this state, if sand pile molding pack P is driven into first member 80,
second member 90 is located swiftly at a predetermined position along guide
paths 81 in first member 80. Thus, sand pile molding pack P is linearly
located in first member 80 while maintaining the original state without
twisting sand pile molding pack P. A reference numeral 100 designates a
sand driver for filling the sands into pack P.
FIG. 6 is a perspective view of the second member of FIG. 4
according to another embodiment of the present invention. In this
embodiment, second member 90 is formed of a plate member in which a
curved portion 97 is wholly bent downwards and an engagement hole 94
for engaging pack P is formed thereon. The reason why curved portion 97
is formed in the plate member is for making the smoothly concave portion
due to the curved portion 97 more naturally adapting to a convex portion of
the pack, because the lower end of pack P forms the convex spherical body
when filling the sands into pack P.
FIGs. 7A through 7F are plan views of second members 90 of FIG. 4
according to various embodiments of the present invention. The same
elements are assigned with the same reference numerals as those of FIG. 4.
FIG. 7A shows that a single guide path 81 is formed in first member 80
and second member 90 is formed as a circular plate having a single recess
98. FIGs. 7B and 7C show second members 90 having recesses as many as
the number of guide paths 81 in first member 80, respectively. FIGs. 7D
through 7F show that second members 90 can rotate to some extent in first
a 3
-
member 80. The detailed description thereof will be omitted since it will be
appreciated through the drawings without further descriptions.
FIG. 8 is a plan view of the guide casing according to another
embodiment of the present invention. As shown in FIG. 8, guide casing 100
in this embodiment is integrated with at least one reinforcement member
101. The reinforcement member 101 is for bending a paper drain board 102
and guiding it into casing 100. It is more preferable that paper drain
board 102 is made of an easily bendable material at the portions which are
shown as dotted lines. As described above, since paper drain board 102 is
bent and installed by reinforcement member 101, a wider drain board can be
driven as a smaller cross-sectional area than in the linearly installed case.
Accordingly, a draining effect is largely enhanced and the ground movement
is reduced when driven.
FIGs. 9A through 9D are plan views of guide casings according to
different embodiments of the present invention. As shown in FIGs. 9A
through 9D, guide casings 110 in these embodiments have at least one outer
protrusion 111, respectively. Such protrusions 111 are to prevent bending of
guide casings 110 when guide casings 110 are driven underground,
respectively.
FIGs. 10A through 10B are perspective views of an autQmatic pack pile
driver according to the present invention. The automatic pack pile driver
according to the present invention includes a pack supply member 120 and a
pack guide member 130. FIG. 10A is a perspective view of pack supply
member 120 and pack guide member 130. Pack supply member 120 includes
a cylindrical body 121 which winds the pack therearound and a support 122
- 10 -
217~03
which supports the pack in both ends of cylindrical body 121. One support
122 and cylindrical body 121 forms a first groove 123 which is lengthwise
formed. Pack guide member 130 includes a circular plate member 132 in
which a second groove 131 is formed downwards in parallel with first
groove 123 and a support 133 which is integrally with circular plate member
132. A reference numeral 140 is a hanger member 120 for ratatably hanging
pack supply member 120.
FIG. 10B is a perspective view for explaining an operation when pack
P is driven into the automatic pack pile driver. As shown in FIG. 10B, pack
P wound in pack supply member 120 is driven into second groove 131 in
pack guide member 130. A stopper edge 150 is formed in pack P every
predetermined length. Thus, if pack P is inserted into a guide casing (not
shown) by a predetermined length, the stopper edge 150 is stopped by
second groove 131 and the driving operation is interrupted. Here, it can be
seen that second groove 131 is made so that pack P passes therethrough
but the stopper edge 150 of pack P cannot pass therethrough. Moreover,
first groove 123 fixes pack P in the inside of cylindrical body 121 after
inserting one end of pack P thereinto.
FIG. 11 is a plan view of the pack guide casings in which a plurality
of the pack guide casings are simultaneously buried underground. As can
be seen from the drawing, a plurality of the pack guide casings 160 are
mutually connected by first connectors 161. Thus, bending of the casing can
be prevented when a plurality of the guide casings are simultaneously
driven underground, The dotted lines in the drawing represent second
connectors 162 for effectively preventing the bending of the casing.
- ~17~4(~3
FIG. 12 is a conceptual view for explaining a drain aligning method
according to the present invention. As shown in the drawing, the draining
method according to the present invention has processes of maintaining a
virtual line which connects a center line of each drain in four rectangular
drains adjacent to each other to form a square, and of aligning each drain
of a length direction to be perpendicular to an adjacent drain lengthwise at
the center. Thus, an effective draining radius is balanced and a ground
sink is also expedited since a draining interval is compact.
FIG. 13A is a perspective view of the conventional flexible drain
structure. The conventional flexible drain is in a cylindrical shape and the
diameter of the cylindrical body is limited to a range between 5cm and
25cm. The reason why the size of the diameter is limited resides in a fact
that a normal draining is not performed if the diameter is less than 5cm,
and the pack used in the draining or the flexibility of the drain is broken in
case of the diameter of more than 25cm.
FIG. 13B is a perspective view of a drain structure according to the
present invention. The drain structure of the present invention is a
rectangular shape. The rectangular shape should have a length between 5cm
and 25cm in both sides, respectively. Thus, the draining becomes smooth
and solves the breakage of flexibility of the drain. When compared with the
conventional art, the present invention provides effects that the same
amounts of the sands are consumed and the draining contact surface area is
widened. That is, referring to FIGs. 13A and 13B, under the assumption of
the same height, the drains of FIGs. 13A and 13B have the nearly same
areas, but the FIG. 13B drain has much larger surface areas in view of the
2 ~ J 3
circumferential length.
INDUSTRIAL APPLICABILITY
The present invention can be used for reinforcing a soft ground, and
also employed in an earth work, foundation work and pile driving work
which requires for reinforcing a soft ground.
-- 13 --
