JP6292504B2 - Method and apparatus for burying horizontal drain material - Google Patents

Description

  The present invention relates to a horizontal drain material embedding method and an apparatus for embedding an artificial material drain material mainly used in a liquefaction countermeasure method in a horizontal direction in the ground.

  Conventionally, in sandy ground where groundwater has accumulated (called aquifered ground), the pressure between water (pore water) in the ground suddenly increases due to the impact of seismic motion, etc., and the balance between the sand and sand particles is balanced. It is known that a phenomenon that the soil and sand behave like a liquid, that is, a ground liquefaction phenomenon occurs.

  In such a stagnant ground, there is a risk of causing serious damage such as collapse of a building due to ground subsidence due to a liquefaction phenomenon, and therefore it is required to take measures to prevent the occurrence of liquefaction.

  Conventionally, many methods such as sand compaction pile method and high-pressure jet agitation method have been developed as countermeasures against liquefaction. Among them, drainage drain method does not require complicated or large-scale equipment, and noise and vibration. It is known as a useful construction method in urban areas because it can suppress the compacting work that causes the damage.

  In the drainage drain method, a plurality of drainage materials with water permeability are installed in the vertical (vertical) direction of the ground, and excess pore water generated by impact such as seismic motion flows into the drain material to increase pore water pressure. To suppress or dissipate pore water.

  In this drainage drain method, after excavating and discharging the casing to the desired depth of the target ground, drain material such as crushed stone and gravel is put into the casing and the drain material is compacted while the drain material is compacted. A crushed stone drain construction method in which a crushed stone drain pile made of crushed stone or the like is placed in the ground by pulling it out (see, for example, Patent Document 1), while digging and discharging a tubular casing to the desired depth of the ground, There is an artificial material drain construction method in which an artificial material drain material is embedded in the ground by inserting an artificial material drain material into the casing and pulling the casing from the ground (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 07-180132 JP 2004-36300 A

  However, in the conventional drainage drain method as described above, since it is assumed that the drain material is installed in the vertical (vertical) direction, many drain materials must be provided in order to ensure the desired drainage performance. In addition, there is a problem that a large number of water collecting pipes for connecting the drain materials must be provided.

  In addition, the conventional drainage drain method has a problem that if there is a building or a building on the target ground, it is impossible to install drainage material under the building. There was a problem that it was difficult to improve efficiency.

  Furthermore, in the conventional crushed stone drain construction method, there has been a problem that a crushed stone drain pile made of a drain material such as sand or crushed stone has to be placed, which is troublesome and the work efficiency is poor. .

  On the other hand, in view of the problems of the conventional drainage drain method, it is conceivable to bury the drain material horizontally in the target ground, but conventionally, in order to bury the drain material horizontally in the ground, It is necessary to rely on the excavation method of excavating the surface of the ground and embedding horizontal drain material, and it is not possible to cope with the case where buildings such as buildings and houses exist on the target ground. There is a risk of causing pollution such as traffic congestion by closing the area around the excavated area as the surface is excavated.

  Therefore, in view of such a conventional problem, the present invention is a horizontal drain material that can be easily embedded in a horizontal direction without cutting the ground surface, mainly for drain materials used for ground liquefaction countermeasures. It was made for the purpose of providing the burial method and its equipment.

  The feature of the invention method according to claim 1 for solving the conventional problems as described above is an embedding method of a horizontal drain material in which a drain material having water permeability is buried in the ground in the horizontal direction, A pair of shafts is formed at a predetermined interval from the ground surface, and a plurality of casing members are sequentially connected to the rear end side from one side of the shaft to the other side by a propulsion unit, and the compatible shafts are pushed out. A casing having a communication opening is buried, a drainage material having water permeability is inserted into the casing, and a water stop plug in the casing that can be expanded and contracted in the radial direction is inserted into one end of the shaft. In addition, the casing pull-out side end closing member for opening and closing the one shaft side end of the casing is fitted, and the casing is attached to the reaction force receiver extended through the casing from the other side of the shaft. By connecting the water stop plug in the casing, it is impossible to move the water stop plug in the casing to one of the shafts, and the end of the casing is closed by the casing withdrawal side end closing member, and the water stop in the casing is closed. With the plug reduced in diameter and with the contact pressure against the casing inner surface of the water stop plug in the casing removed, the casing is pulled out into the one shaft by the length of at least one casing member, and after the pulling operation The casing water stop plug is inflated to close the inside of the casing by press-contacting the inner surface of the casing member remaining in the ground, and then the pulled out casing member is removed, and the casing withdrawal side end A part closing member is fitted to the end of the underground casing member to seal it, and then the water stop plug in the casing is attached. The diameter is reduced, and the drawing operation of the casing and the removing operation of the drawn casing member are repeated to leave the drain material in the ground.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the connection of the subsequent casing member immediately after the leading end casing member at the extruding side end portion by the propulsion unit of the casing is performed by pulling out both casings. The joint of the other casing member is formed by connecting the socket part of one casing member and the insertion part of the other casing member by a screw joint.

  According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the casing pull-out side end closing member is screwed into a threaded joint at the rear end of the casing member, and the casing member rearward. That is, it has a lid that seals the end.

  According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, a casing that shields the casing at an opening portion to the other vertical shaft opposite to the pulling operation side of the casing. The tip shielding material is fixed, and this supports the water stop plug reaction force receiver in the casing.

The feature of the invention of claim 5 is that, in addition to the structure of any one of claims 1 to 3, the opening to the other shaft on the side opposite to the pulling operation side of the casing does not close it. The reaction force receiver of the water stop plug in the casing is inserted through the opening and the other shaft.

  The invention device according to claim 6 is characterized in that it is installed in one side of a pair of vertical shafts formed at a predetermined interval, and a cylindrical casing member having a predetermined length is extruded while being sequentially connected to the rear end side. And a casing that is buried between the compatible mine shafts and in which the drain material is inserted, and the drain material is left in the ground and is pulled out from either side of the vertical shaft. A pull-out means, a water stop plug that expands and contracts in the pull-out side end portion of the casing by the discharge of fluid, and shields the inside of the casing end during expansion; and the movement of the water stop plug on the casing pull-out side Provided with a reaction force receiving member made of a tensile wire led to the end opposite to the drawing side of the casing and a detachable casing drawing side end closing member for shielding the leading end of the casing on the drawing side. The casing pull-out side end closing member closes the opening of the casing member at the pull-out side end of the casing, and the length of at least one casing member of the casing is released in a state where the shielding by the water stop plug is released. The casing member pulled out in a state where the inside of the casing member in the ground is shielded by the water stop plug is removed.

  According to a seventh aspect of the present invention, in addition to the structure of the sixth aspect, the connection of the subsequent casing member immediately after the leading end casing member of the extrusion side end portion of the casing is performed between the two casing members by a drawing operation. The other joints of the casing members are separated from each other by connecting the socket part of one casing member and the insertion part of the other casing member by a threaded joint.

  According to an eighth aspect of the present invention, in addition to the configuration of the sixth or seventh aspect, the casing pull-out side end closing member is screwed into a threaded joint at the rear end of the casing member so as to That is, it has a lid that seals the end.

According to a ninth aspect of the present invention, in addition to the structure of any one of the sixth to eighth aspects , a casing that shields the casing at an opening to the other shaft on the side opposite to the drawing operation side of the casing. The tip shielding material is fixed, and this supports the water stop plug reaction force receiver in the casing.

  The horizontal drain material embedding method and its apparatus according to the present invention are, as described above, a horizontal drain material embedding method for embedding a drain material having permeability in the horizontal direction in the ground, from the ground surface. A pair of shafts are formed at a predetermined interval, and a plurality of casing members are sequentially connected to the rear end side from one side of the shaft to the other side by a propulsion unit, thereby communicating between the compatible shafts. Embedded in the casing, a drain material having water permeability is inserted into the casing, a water stop plug in the casing that can be expanded and contracted in the radial direction is inserted into one end of the shaft, and the casing A casing pull-out side end closing member for opening and closing the one shaft side end of the casing is fitted, and the case is extended to the reaction force receiver extended through the casing from the other side of the shaft. By connecting the water stop plug in the casing, it becomes impossible to move the water stop plug in the casing to one shaft side, and the end of the casing is closed by the casing withdrawal side end closing member, and the water stop in the casing is closed. With the plug reduced in diameter and with the contact pressure against the casing inner surface of the water stop plug in the casing removed, the casing is pulled out into the one shaft by the length of at least one casing member, and after the pulling operation The casing water stop plug is inflated to close the inside of the casing by press-contacting the inner surface of the casing member remaining in the ground, and then the pulled out casing member is removed, and the casing withdrawal side end A part closing member is fitted to the end of the underground casing member to seal it, and then the water stop plug in the casing is attached. The drain material was repeatedly removed and the removed casing member was removed, so that the drain material was left in the ground. Therefore, it is possible to efficiently take measures against liquefaction on the ground with a small amount of drainage material. In addition, drain material can be buried directly under the building.

  Further, in the present invention, a tubular member oriented in the horizontal direction composed of the plurality of casing members is formed between the compatible shafts by propelling the leading conductor from one shaft toward the other shaft while sequentially arranging the casing members on the rear side. By burying the casing, it is possible to embed the casing in the ground efficiently without excavating the ground surface.

  In the present invention, the connection of the subsequent casing member immediately after the leading end casing member at the extrusion side end portion by the propulsion unit of the casing is a bayonet joint that separates the two casing members by a drawing operation, and the other casing members In this joint, the socket part of one casing member and the insertion part of the other casing member are connected by a threaded joint, so that the tip casing member can be left in communication with the shaft when the casing is pulled out. It becomes easy, the collapse of the drain port in the shaft can be prevented, and water stoppage between the shaft and the ground becomes easy.

  In the present invention, the casing pull-out side end closing member has a lid that is screwed into a screw joint at the rear end of the casing member to seal the rear end of the casing member. It can also be used as a member for pulling out the casing, and the apparatus can be simplified.

  In the present invention, a casing tip shielding material that shields the casing is secured to the opening to the other shaft on the opposite side to the pulling operation side of the casing, and the water stop plug reaction force receiver in the casing is supported thereby By doing so, a dry working space can be easily formed in both the compatible wells, and the working environment is improved.

  In the present invention, the opening to the other shaft on the side opposite to the drawing operation side of the casing does not close the opening, and the reaction force of the water stop plug in the casing passes through the opening and the other shaft. By inserting the receptacle, the device is simplified.

It shows an example of the implementation of the present invention and is a cross-sectional view showing a state where a casing is installed between shafts by a propulsion method. It is sectional drawing which expands and shows a part of propulsion machine same as the above. It is a fragmentary sectional view which shows the connection state of the casing member in FIG. It is sectional drawing which shows the outline of the apparatus for casing extraction after drain material insertion. It is sectional drawing which shows the casing water stop plug inserted in the casing edge part shown in FIG. 1, and a casing extraction side edge part closing member. It is sectional drawing which shows the drain material insertion process in a casing. It is sectional drawing which shows the drain material insertion completion state same as the above. It is a longitudinal cross-sectional view in the state where extraction of one casing member same as the above was completed. It is a longitudinal cross-sectional view of the state which removed one casing member same as the above. It is a longitudinal cross-sectional view of the drain material embedding completion state. It is a longitudinal cross-sectional view which shows the other Example of this invention.

  Next, an embodiment of the horizontal drain material embedding device according to the present invention will be described based on the illustrated examples. In addition, the code | symbol A is the sand ground (henceforth only the ground A) which performs a liquefaction countermeasure, the code | symbol B is a groundwater level, and the codes | symbols 1 and 2 are working shafts.

  As shown in FIG. 1, each shaft 1, 2 is formed in a dry state where the inner surface is covered with a water-impervious wall 3, and one of the shafts is an extrusion-side shaft 1 in which a propulsion machine 12 and the like are installed. The other shaft is the arrival side shaft 2.

  In addition, a penetration hole 4 is formed at a desired position in the impermeable wall 3, and the leading conductor 11 and the casing 10 are press-fitted into the ground through the penetration hole 4. Reference numeral 5 in the figure denotes the casing 10. It is a water stop material which stops water between the outer peripheral surface of this and the inside of the impermeable wall 3.

  As shown in FIG. 1, the horizontal drain material embedding device is a propulsion device in which the casing 10 is embedded in the ground A by sequentially connecting casing members 10 a, 10 b, 10 b... 4 and a casing removing means 13 for pulling out the casing 10 from the ground A as shown in FIG. 4, and as shown in FIGS. 1 and 6, horizontal in the ground from one shaft 1 to the other shaft 2 The drain material 14 is inserted into the casing 10 embedded in the direction, and the casing 10 is pulled out from the state toward the shaft 1 so that the drain material 14 can be embedded in the ground A in the horizontal direction. It has become.

  The drain material 14 is a columnar or cylindrical artificial material drain material having water permeability, and is formed into a hollow cylindrical column shape with a filter material made of synthetic resin having water permeability, for example, and axial ends thereof are connected to each other. And inserted into the casing 10.

  The casing 10 includes a plurality of tubular casing members 10a, 10b, 10b,... Made of steel pipes, vinyl chloride pipes, etc., and the casing members 10a, 10b, 10b,. By connecting in the axial direction, it is formed into a long tubular shape extending between the compatible wells 1 and 2.

  As shown in FIG. 3, each casing member 10a, 10b is formed in a cylindrical shape, and as shown in FIG. 3, the leading end casing member 10a protruding from the push-out side of the propulsion unit 12, that is, the leading end side shaft 2, and the subsequent casing member 10b immediately thereafter. Is an insertion joint that is fitted by inserting the insertion portion 18 at the front end of the subsequent casing member 10b into the socket portion 17 formed at the rear end of the front end casing member 10a, and is easily detached when a force in the pulling direction is applied. Is used.

  The subsequent casing members 10b, 10b are connected by a screw joint that is connected by screwing the male screw portion 15 to the female screw portion 16 at the tip, and is not separated only by an external force in the pulling direction. ing.

  In addition, a water-stopping packing 19 is interposed in each joint portion so as to be connected while maintaining watertightness.

  As shown in FIGS. 1 and 2, the propulsion unit 12 includes a tip conductor 11 having a cutter head 21 rotatably at a front portion in a traveling direction of the tip conduit 20, and a screw having a tip connected to the rear end of the cutter head 21. A rotary shaft 22 including a shaft, a rotary drive unit 24 for applying rotational power to the rotary shaft 22, and the rotary drive unit 24 move back and forth on the base 25 to press the casing member 10b at the rearmost end in the traveling direction. A pressing unit 26 and a propulsion unit front / rear drive unit 28 for moving the pressing unit 26 and the rotary drive unit 24 back and forth are provided.

  The pressing portion 26 is formed in a flat plate shape with the front face directed in the propulsion direction, has a shaft insertion hole 27 that opens in the front and rear directions, and has a lower end that is movably supported on the base 25. It is designed to move back and forth.

  The propulsion unit front / rear drive unit 28 includes a cylinder 29 such as a hydraulic cylinder having a cylinder body 29a fixed to the pressing portion 26 and a rod 29b supported so as to be able to enter and exit the cylinder body 29a. The pressing part 26 is moved back and forth by inserting and removing the rod 29b fixed to the base end fixing part 30 disposed in the rear part with respect to the cylinder body 29a.

  In addition, the rotary drive unit 24 is connected to the pressing portion 26 via a connecting member 31 that also serves as a shock absorber, and the rotary drive unit 24 also moves as the pressing portion 26 moves.

  The rotation drive unit 24 includes a rotation operation unit 23 rotatably supported in the rotation shaft unit main body 24a, and the rotation operation unit 23 is rotated by a motor 32 such as an electric motor or a hydraulic motor via a reduction gear. It is supposed to work.

  The rotation operation unit 23 has a through-hole 33 opened in the front and rear in the center, and a base end of the rotation shaft 22 is detachably connected to the center of the front surface.

  On the other hand, as shown in FIG. 4, the casing removing means 13 also serves as the propulsion unit 12 described above, and pulls out the casing 10 by the retreating operation of the pressing portion 26 by the front and rear drive unit 28. When the water in the ground in the casing 10 flows in, the water in the casing is closed in the casing member at the end so that the water is not discharged into one shaft 1 where the propulsion unit 12 is installed. It has the plug 50 and the casing extraction | drawer side edge part closing member 51 which closes the shaft 1 inner side edge part of this casing member.

  The propulsion unit 12 when used as the pulling-out means 13 for removing the casing removes the rotary shaft 22 when used as the propulsion unit, and as shown in FIG. 4, the connection attachment is connected to the shaft 1 side end of the casing member. 43 is attached. Then, the tip of the succeeding casing member 10b protruding to the shaft 1 side is connected to this, and the pressing portion 26 is moved backward to leave the tip casing member 10a and pull out the casing 10 made of the succeeding casing member 10b to the shaft 1 side. I have to.

  The connection attachment 43 includes a cylindrical body 45 fitted into the pressing portion 26 by a set screw 45a so as not to fall off. The cylindrical body 45 is integrally provided with a casing extraction side end closing member 51.

  The casing drawing side end closing member 51 is constituted by a flat shield plate 51a and a cover body including a casing member attaching / detaching ring 51b protruding coaxially with a cylindrical body 45 on the front surface thereof, and the outer periphery of the ring 51b. The male screw formed on the surface is screwed into the female screw at the inner periphery of the distal end portion of the subsequent casing member 10b to be connected to the subsequent casing member 10b.

  As shown in FIGS. 4 and 5, the in-casing water stop plug 50 includes a columnar base portion 52 and a hollow annular seal portion 53 fixed to the outer peripheral portion of the base portion 52. The exhaust gas expands and contracts in the radial direction by exhaust gas, and is inflated so as to be pressed against the inner peripheral surface of the casing member 10b and shielded from passing water, and by contracting, the inner peripheral surface of the casing member 10b is reduced. The contact pressure is removed, and relative movement between the two becomes possible.

  Injecting / exhausting into the water stop plug 50 in the casing is performed through an injecting / exhaust hose 54, and although not shown, the injecting / exhausting is performed by switching between a compressor and an exhaust hole by a switching valve. It has become.

  The exhaust hose 54 extends through the central portion of the casing drawing side end closing member 51, and the penetrating portion is sealed with a packing 55.

  The exhaust hose 54 is connected to the casing drawing-side end closing member 51 and the in-casing water stop plug 50 by couplers 56 and 56 that can be separated and connected, and the in-casing water stop plug 50 is connected to the exhaust hose 54. The length between the casing drawing side end closing member 51 and the casing drawing side end closing member 51 is long enough to prevent the casing member 10b described later from being pulled out and removed. Both couplers 56 are provided with cocks 57 for opening and closing the internal flow paths. The couplers 56, 56 may have an automatic opening / closing valve that automatically opens when connected and automatically closes when separated, in which case the cock 57 is unnecessary. .

  As shown in FIG. 4, the water stop plug 50 in the casing is connected to a reaction force receiver 60 extended from the other shaft 2 side through the inside of the casing 10, so that the water stop plug 50 in the casing is connected to one shaft 1 side. Not to move.

  The reaction force receiver 60 has a casing tip shielding member 61 fitted to the opening to the other shaft 2 opposite to the pulling operation side of the casing 10 so as to shield the casing 10, and the shielding member 61. It is comprised from the tension | pulling wire 62 which connects the water stop plug 50 in a casing. The tensile wire 62 is connected to a length adjusting shaft 63 that is passed through the shielding member 61, and the length adjusting shaft 63 can be moved in the axial direction by an adjusting screw 64.

  The casing front end shielding member 61 includes a flat shielding plate 65, an insertion portion 66 projecting from the back surface thereof, and a ring-shaped water-stopping packing 67 made of a rubber-like elastic material fitted on the outer periphery of the insertion portion 66. Then, the insertion portion 66 is press-fitted into the opening portion of the tip casing 10a to shield it watertightly.

  The casing front end shielding member 61 is fixed to the front end casing member 10a by a stopper 70 so as to be immovable. The stopper 70 is a shielding member against the support fitting 71 welded between the water shielding wall 3 and the casing 70. The 61 shielding plates 65 are bolted.

  The shielding plate 65 is provided with a pouring / draining passage 68 that can be opened and closed by an opening / closing valve 69.

  Next, an example of the horizontal drain embedding method according to the present invention will be described.

  First, the vertical shafts 1 and 2 are formed at intervals in the horizontal direction on the target ground A to be subjected to liquefaction countermeasures, and the dry walls are formed by shielding the inner surfaces of the vertical shafts 1 and 2 with the water shielding walls 3.

  Next, as shown in FIG. 1, a propulsion unit 12 is installed in one of the vertical shafts 1, and a casing 10 made of a steel pipe, a vinyl chloride pipe, or the like is embedded in the ground between the compatible mines 1 and 2 by a propulsion method.

  That is, the excavation process of excavating the ground A by the cutter head 21 and moving the pressing portion 26 forward to push the casing member 10b at the rear end disposed behind the leading conductor 11 by a desired distance, and the pressing portion 26 to retreat. The step of adding the rotating shaft 22 and the step of adding a new casing member 10b to the rear end of the casing member 10b at the rearmost end are repeated, and the tubular casing 10 is buried between the compatible shafts 1 and 2.

  Then, when the burying of the casing 10 is completed and the leading conductor 11 reaches the other shaft 2, the leading conductor 11 is removed from the other shaft 2, and the rotating shaft 22 is removed from the rotating operation unit 23, and the rotating shaft 22 is removed. The propulsion unit 12 is sequentially removed while being pulled out from the casing 10 so that the propulsion device 12 can be switched to the casing removal means 13.

  Next, as shown in FIG. 6, the drain material 14 is inserted into the casing 10 sequentially from one shaft 1 side while being added, and as shown in FIG. 7, over the substantially entire length of the casing 10, that is, the target ground. A is arranged so as to spread horizontally in A.

  When the drain material insertion is completed, as shown in FIG. 4, the in-casing water stop plug 50 is inserted into the casing end portion on the shaft 1 side in a reduced diameter state, and the tensile wire 62 on the back surface is inserted through the drain material 14 into the shaft. It is pulled out to the second side, and the length adjustment shaft 63 at the tip thereof is passed through the casing tip shield member 61, and the casing tip shield member 61 is fitted and fixed to the opening of the tip casing member 10a protruding to the shaft 2. Thereafter, a nut is fitted to the length adjusting shaft 63 to adjust the protruding length in the casing so that the water stop plug 50 in the casing is not moved from the predetermined position of the casing end to the shaft 1 side. To do.

  Next, the intake / exhaust hose 54 between the water stop plug 50 in the casing and the casing drawing side end closing member 51 is communicated by coupling the couplers 56, 56, and the end opening protruding into the shaft 1 of the casing 10 is shielded from the casing. The connecting attachment 43 is connected to the pressing portion 26 of the propulsion unit 12 by shielding with the tool 51, and the pressing portion 26 is retracted by the length of one of the subsequent casing members 10b.

  As a result, as shown in FIG. 8, the succeeding casing member 10b immediately after the leading casing member 10a is pulled out, and the entire casing 10 including the succeeding casing member 10b is pulled out into the shaft 1 by one succeeding casing. At this time, the groundwater enters the casing 10 from between the front casing member 10a and the subsequent casing member 10b, but since both ends of the casing 10 are closed, the groundwater is not discharged into the shafts 1 and 2.

  When the drawing operation for one succeeding casing member is completed in this manner, as shown in FIG. 9, the compressed air is injected into the in-casing water stop plug 50 to expand, and the outer peripheral surface is left in the ground. The inner part of the next succeeding casing member 10b is pressed against the inner peripheral surface to shield the inside.

  When the shielding by the in-casing water stop plug 50 is completed, the casing withdrawal side end closing member 51 is removed, the cocks 57 of both couplers 56 are closed, the couplers 56 and 56 are disconnected, and the shafts 1 are drawn into the shaft 1. The succeeding casing member 10b is separated from the ground and removed.

  After the removal, the couplers 56 and 56 are connected, the cock 57 is opened, the pressure from the compressor is applied, and the pressing portion 26 is advanced in a state where the expanded state of the water stop plug 50 in the casing is maintained. Similarly, the casing withdrawal side end closing member 51 is fitted to the end of the next succeeding casing member 10b protruding from the ground and closed. In this state, the pressurized air in the casing water stop plug 50 is discharged to reduce the diameter, and the pressure contact state with the inner surface of the casing is released. Thereafter, the pressing portion 26 is moved backward in the same manner as described above to obtain one subsequent casing member 10b. Pull out the casing by the length of.

  The succeeding casing member 10b is sequentially removed by repeating the operation of pulling out and removing the one succeeding casing member, and the last succeeding casing member 10b is left in a state where the water shielding wall 3 of the shaft 1 is penetrated. The embedding of the drain material 14 is completed.

  After the completion of the burial, the equipment such as the propulsion unit 12 in the shaft 1 is removed, the submersible pump 72 is installed in the compatible shafts 1 and 2, the casing withdrawal side end closing member 51, the casing water stop plug 50, the casing tip The shielding material 61 is removed.

  Finally, as shown in FIG. 10, water is drained from the submersible pump 72 into the compatible mines 1 and 2, and the water level in the ground A is lowered to prevent liquefaction.

  As a result, the drain material 14 can be buried horizontally in the ground A without excavating the ground surface, and excess pore water flows into the shafts 1 and 2 through the drain material 14, resulting in seismic motion or the like. It is possible to suppress a sudden rise in the pressure of water (pore water) between the earth and sand particles in the ground due to the impact, and the occurrence of the liquefaction phenomenon of the ground A can be prevented.

  Further, according to the method of the present invention, the drain material 14 can be embedded in the ground direction with high accuracy without damaging the ground material under the building such as a house or a building. With a small number, it can be drained efficiently even in the ground A directly under the building.

  In the example described above, the casing front end shielding member 61 is fitted into the casing opening of the reaching side shaft and sealed, and this shielding member 61 is used as a reaction force receiver for the water stop plug 50 in the casing. As shown in FIG. 11, the ground water may flow into the reaching side shaft 2 without using the material, and the tensile wire 62 may be led upward through the shaft 2 and fixed to the upper portion of the shaft.

  In the above-described embodiment, the example in which the propulsion unit 12 is used as the casing removal unit 13 has been described. However, the casing removal unit 13 may be provided separately from the propulsion unit 12, and in that case, the other shaft 2 may be provided with the casing removing means 13.

  Moreover, although the above-mentioned Example demonstrated the example which left the compatible mine 1 and 2 after the drain material 14 embed | buried, and installed drainage means, such as the pump 72, in the compatible mine 1 and 2, after the drain material 14 embed | buried The water shielding wall 3 may be removed from one of the shafts 1 and the earth and sand may be backfilled to remove the one shaft 1.

A Ground B Groundwater level 1, 2 Vertical shaft 3 Impervious wall 4 Penetration hole 5 Water stop material 10 Casing 10a, 10b Casing member 11 Lead conductor 12 Propeller 13 Casing removing means 14 Drain material 15 Male thread 16 Female thread 17 Socket 18 Insertion part 19 Water stop packing 20 Lead pipe 21 Cutter head 22 Rotating shaft 24 Rotation drive unit 25 Base 26 Press part 28 Front / rear drive unit 29 Cylinder 30 Base end fixing part 31 Connecting member 32 Motor 33 Insertion hole 40 Water stop body 41 Water stop body support Member 43 Connection attachment 45a Set screw 45 Cylindrical body 50 Water stop plug 51 in casing Casing pull-out side end closing member 51a Shield plate 51b Casing member attaching / detaching ring 52 Cylindrical base 53 Sealing part 54 Exhaust hose 55 Packing 56 Coupler 57 Cock 60 anti Receiving 61 casing tip shield member 62 pull wire 63 length adjusting shaft 64 adjustment screw 65 blocking plate 67 waterproofing packing 68 Note drainage passage 69 opening valve 70 stop 71 Bracket 72 water pump

Claims (9)

A horizontal drain material embedding method in which a drain material having water permeability is embedded in the ground in the horizontal direction,
A pair of shafts are formed at a predetermined interval from the ground surface,
A casing having a communication opening between the compatible pits is buried by pushing out a plurality of casing members sequentially connected to the rear end side from one side of the shaft to the other side by a propulsion unit,
Inserting a drainage material having water permeability into the casing;
A casing internal water stop plug that can be expanded and contracted in the radial direction is inserted into one shaft side end portion of the casing, and a casing withdrawal side end closing member that opens and closes the one shaft side end portion of the casing is fitted. Combined
By connecting the water stop plug in the casing to the reaction force receiver extended through the inside of the casing from the other side of the shaft, the water stop plug in the casing cannot be moved to one shaft side,
The casing pull-out side end closing member closes the end of the casing, reduces the diameter of the water stop plug in the casing, and removes the contact pressure of the water stop plug in the casing against the casing inner surface. The length of one casing member of the part is pulled out into the one vertical shaft,
After the pulling-out operation, the inside of the casing is closed by expanding the water stop plug in the casing and bringing it into pressure contact with the inner surface of the casing member remaining in the ground,
Next, the pulled out casing member is removed, the casing withdrawal side end closing member is fitted to the end of the underground casing member, and this is sealed.
Thereafter, the drain plug in the casing is reduced in diameter, and the operation of pulling out the casing and the operation of removing the drawn casing member are repeated to leave the drain material in the ground. Construction method.   The connection of the subsequent casing member immediately after it to the front end casing member at the extrusion side end by the casing propulsion unit is an insertion joint in which the two casing members are separated by a drawing operation, and the other casing member joint is one of the joints. The horizontal drain material embedding method according to claim 1, wherein the socket portion of the casing member and the insertion portion of the other casing member are connected by a screw joint.   3. The horizontal drain member according to claim 1, wherein the casing pull-out side end closing member has a lid that is screwed into a screw joint at a rear end of the casing member to seal the rear end of the casing member. Buried construction method. The casing front-end | tip shielding material which shields this is fixed to the opening part to the other vertical shaft on the opposite side to the extraction operation side of the said casing, The said water stop plug reaction force receptacle in the said casing is supported by this. The horizontal drain material embedding method according to any one of ?   The opening to the other shaft on the opposite side to the pulling operation side of the casing is not closed, and the reaction force receiver of the water stop plug in the casing is inserted through the opening and the other shaft. The horizontal drain material embedding method according to any one of Items 1 to 3. A propulsion unit that is installed in one side of a pair of vertical shafts formed at a predetermined interval, and embeds a casing between the compatible shafts by extruding a cylindrical casing member of a predetermined length sequentially connected to the rear end side thereof; ,
A casing extraction means for extracting a casing embedded between the compatible mine shafts and having a drain material inserted therein, from either side of the shaft while leaving the drain material in the ground,
A water stop plug that expands and contracts by draining and discharging the fluid in the drawing side end of the casing, and shields the inside of the casing at the time of expansion,
A reaction force receiver made of a tensile wire led out from the casing pulling side of the water stop plug to the end side opposite to the pulling side of the casing;
A detachable casing withdrawal side end closing member that shields the leading end of the casing on the withdrawal side;
The casing pull-out side end closing member closes the casing member opening at the pull-out side end of the casing, and the length of at least one casing member of the casing is pulled out with the shielding by the water stop plug being released. , embedded devices in the horizontal drain material made as a feature that it has to be removed the casing member is withdrawn while shielding the interior of the casing member during ground by the water stop plugs. The connection of the subsequent casing member immediately after it to the front end casing member at the end of the extrusion side of the casing is a bayonet joint that separates the two casing members by a pulling operation, and the other casing member joint is one of the casing members. The horizontal drain member embedding apparatus according to claim 6, wherein the socket portion and the insertion portion of the other casing member are connected by a screw joint.   The horizontal drain according to claim 6 or 7, wherein the casing drawing side end closing member has a lid that is screwed into a screw joint at a rear end of the casing member to seal the rear end of the casing member. Material burying equipment. The casing front-end | tip shielding material which shields this is fixed to the opening part to the other vertical shaft on the opposite side to the drawing-out operation side of the said casing, The said water stop plug reaction force receptacle in the said casing is supported by this. The horizontal drain material embedding device according to any one of ˜8.

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