JP2013241790A - Installation method of water pumping well, and steel pipe casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method of a water pumping well, allowing for a deep construction depth.SOLUTION: A steel pipe casing 1 includes a steel pipe 2 and a lid body 10 to be detachably fixed to the tip of the steel pipe 2. The installation method of a water pumping well includes embedding a perforated pipe 20 which can be inserted in the steel pipe casing 1. The diameter of the tip part of the steel pipe 2 is set larger than the diameter of other parts. The steel casing 1 is screwed into a layer 80 to be treated in a state that the steel pipe 2 is fixed to the lid body 10. When the lid body 10 reaches a predetermined depth, the lid body 10 is removed from the steel pipe 2, and crushed stones S are then fed into the steel pipe 2. The steel pipe 2 is lifted up in the axis direction, leaving the lid body 10 and the crushed stones S so as to build a crushed stone column C. A collected crushed stone column Cis composed of a plurality of crushed stone columns C. Subsequently, the perforated pipe 20 is embedded in the collected crushed stone column C, using the steel pipe casing 1.

Description

  The present invention relates to a method for installing a pumping well and a steel pipe casing.

  Conventionally, in a waste disposal site for dumping and disposing of waste, a vent pipe is embedded in the waste layer (layer to be treated), and harmful gases are sucked from the waste layer through the vent pipe. A technique for removing it has been proposed and put into practical use.

  For example, at present, a detachable lid is attached to the tip of a hollow steel pipe to form a steel pipe casing, and the steel pipe casing is screwed into the waste layer with a vent pipe inserted into the steel pipe attached to the lid. A method has been proposed in which a ventilation pipe is embedded in a waste layer by removing the lid from the steel pipe and pulling out only the steel pipe when the lid reaches a predetermined depth (see Patent Document 1). .

JP 2009-249963 A

  By the way, in recent years, groundwater that has leached into the waste layer through the water conduit by embedding the water conduit in the waste layer by adopting the method described in Patent Document 1 described above. A method of pumping water (setting a pumping well) has been proposed.

  However, it is clear that the conventional method described in Patent Document 1 described above cannot be used to install a pumping well for the purpose of pumping at a deep depth exceeding 30 m, for example, for the following reason. It has become.

  First, in order to pump groundwater from a deep depth, it is necessary to use a large pump with a high pumping capacity. In the conventional method using a relatively small diameter PVC pipe, a large pump is used. There is a problem that can not be inserted into. Even when trying to adopt a large-diameter water pipe so that a large pump with a high pumping capacity can be inserted, the steel pipe casing used in the conventional method has a small inner diameter because the joint part has a small inner diameter. There is a problem that a water pipe cannot be inserted.

  In order to solve these problems, a means of adopting a large-diameter steel pipe casing can be considered. However, when such a large-diameter steel pipe casing is employed, the peripheral surface friction during construction becomes remarkably large, so that construction up to a deep depth (for example, about 40 m) becomes impossible. In addition, when a large-diameter steel pipe casing is adopted, the construction machine becomes correspondingly large and a new problem arises that it becomes difficult to carry it into the waste disposal site.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a pumping well installation method capable of realizing construction to a deep depth, and a steel pipe casing used in such a method. To do.

  In order to achieve the above object, a steel pipe casing according to the present invention includes a hollow steel pipe and a lid that is detachably attached to the tip of the steel pipe, and a spiral blade on the outer periphery in the vicinity of the tip of the steel pipe. The diameter of the first part extending a predetermined length from the tip of the steel pipe is set to be larger than the diameter of the second part excluding the first part of the steel pipe.

  When such a configuration is adopted, since the portion (first portion) extending a predetermined length from the tip of the steel pipe casing is set to a relatively large diameter, when the crushed stone column is configured using the steel pipe casing, Large crushed stone pillars can be built. Therefore, when a plurality of crushed stone pillars are assembled to form a crushed stone aggregate pillar or a crushed stone wall, the number of crushed stone pillars can be reduced and cost reduction can be realized. In addition, since the portion (second portion) excluding the portion extending a predetermined length from the tip of the steel tube of the steel tube casing is set to a relatively small diameter, the crushed stone column is constructed using the steel tube casing, or the well tube is connected to the crushed stone column. Or the like, when the steel pipe casing is pulled up from the layer to be treated or the crushed stone pillar, the friction of the peripheral surface can be reduced and the workability can be improved.

  The steel pipe casing which concerns on this invention WHEREIN: A steel pipe can be comprised by connecting a some steel pipe member via a spline joint. At this time, it is preferable to arrange the inner peripheral surface of the spline joint and the inner peripheral surface of the steel pipe member on substantially the same plane.

  If this method is adopted, the inner peripheral surface of the spline joint connecting the steel pipe members is arranged on substantially the same plane as the inner peripheral surface of the steel pipe member, and the spline joint does not protrude into the steel pipe member. A wide internal space can be secured. Therefore, it is possible to insert a relatively large diameter device (for example, a large pump having a high pumping capacity) into the steel pipe.

  The first method according to the present invention uses a steel pipe casing provided with a hollow steel pipe and a lid that is detachably attached to the tip of the steel pipe and provided with a spiral blade on the outer periphery in the vicinity of the tip of the steel pipe. And installing a pumping well by embedding a perforated pipe that has a hole for water passage and can be inserted into a steel pipe casing, and the diameter of the first portion that extends a predetermined length from the tip of the steel pipe, Steel pipe diameter adjustment process to set larger than the diameter of the second part excluding the first part of the steel pipe, and with the steel pipe attached to the lid body, the lid body is directed downward, and the steel pipe is rotated to be treated. The steel pipe casing is screwed in, and when the lid reaches a predetermined depth, the lid is removed from the steel pipe, and then crushed stone is put into the steel pipe, and then the steel pipe is rotated backward to leave the lid and crushed stone. The crushed stone pillar is built by pulling up the shaft in the axial direction, and multiple crushed stone pillars The lid is lowered with the aggregate column forming step that forms the crushed stone aggregate column by building it apart from each other at a predetermined interval, and the perforated tube inserted in the steel pipe and the steel pipe attached to the lid Rotate the steel pipe to turn it, screw the steel pipe casing into the crushed stone collecting column, and when the lid reaches a predetermined depth, remove the lid and the perforated pipe from the steel pipe, reverse the steel pipe and rotate the lid And a perforated pipe embedding step of embedding the perforated pipe in the crushed stone collecting column by lifting the steel pipe in the axial direction while leaving the perforated pipe.

  Further, the second method according to the present invention uses a steel pipe casing provided with a hollow steel pipe and a lid body detachably attached to the tip of the steel pipe, and provided with a spiral blade on the outer periphery in the vicinity of the tip of the steel pipe. And installing a pumping well by embedding a perforated pipe that has a hole for water passage and can be inserted into a steel pipe casing, and the diameter of the first portion that extends a predetermined length from the tip of the steel pipe, Steel pipe diameter adjustment process to set larger than the diameter of the second part excluding the first part of the steel pipe, and with the steel pipe attached to the lid body, the lid body is directed downward, and the steel pipe is rotated to be treated. The steel pipe casing is screwed in, and when the lid reaches a predetermined depth, the lid is removed from the steel pipe, and then crushed stone is put into the steel pipe, and then the steel pipe is rotated backward to leave the lid and crushed stone. The crushed stone pillar is built by pulling up the shaft in the axial direction, and multiple crushed stone pillars An aggregate column forming process for constructing a crushed stone aggregate column by building it apart from each other at a predetermined interval, and with the steel pipe attached to the lid, the lid is directed downward, and the steel pipe is rotated to give crushed stone The steel pipe casing is screwed into the collecting column, and when the lid reaches a predetermined depth, the perforated pipe is inserted into the steel pipe and the perforated pipe reaches the lid, and then the lid is removed from the steel pipe. And the perforated pipe embedding step of embedding the perforated pipe in the crushed stone collecting column by pulling up the steel pipe in the axial direction leaving the lid and the perforated pipe.

  If such a method is adopted, first, a crushed stone aggregate column composed of a plurality of crushed stone columns is constructed in a treated layer using a steel pipe casing, and then a perforated pipe is buried in the crushed stone aggregate column using a steel pipe casing to form a pumping well. Can be installed. Here, since the portion (first portion) extending a predetermined length from the tip of the steel pipe of the steel pipe casing is set to have a relatively large diameter, a crushed stone column having a larger outer diameter can be built. Since the crushed stone pillars are constructed so as to be separated from each other at a predetermined interval, the number of crushed stone pillars can be reduced when the crushed stone collecting pillars are formed, and the cost can be reduced. In addition, since the portion (second portion) excluding the portion extending a predetermined length from the tip of the steel pipe casing is set to a relatively small diameter, the peripheral surface when the steel pipe casing is pulled up from the treated layer or the crushed stone collecting column Friction can be reduced and workability can be improved. Furthermore, by providing a gap between the crushed stone columns when constructing a plurality of crushed stone columns, it is possible to reduce circumferential friction and ground resistance acting on the steel pipe casing during the construction of the crushed stone columns. As a result, drilling can be performed to a deeper depth, and a pumping well having a higher function can be installed.

  The installation method of the pumping well which concerns on this invention can further include the steel pipe member connection process which connects a some steel pipe member and comprises a steel pipe. In the steel pipe member connecting step, a cylindrical female (male) spline joint is fixed to the upper end of the lower steel pipe member to be connected, and a cylindrical male (female) spline joint is fixed to the lower end of the upper steel pipe member to be connected. The spline joints are preferably fitted to each other in the vertical direction, and the two spline joints are fixed to each other by joint fixing means.

  When this method is employed, a long steel pipe can be configured by connecting a plurality of steel pipe members. At this time, the male and female spline joints fixed to the connection ends of the upper and lower steel pipe members in advance are fitted, and the connection work can be completed quickly only by fixing both the spline joints by joint fixing means such as bolts. Sufficient strength can be exhibited against torsional load and pull-out load.

  Moreover, in the installation method of the pumping well which concerns on this invention, it is preferable to arrange | position the internal peripheral surface of a male spline joint, and the internal peripheral surface of a steel pipe member on substantially the same surface.

  If this method is adopted, the inner peripheral surface of the male spline joint and the inner peripheral surface of the steel pipe member are arranged on substantially the same plane, and the male spline joint does not protrude into the steel pipe member, so that the internal space of the steel pipe is reduced. A large-diameter device (for example, a large pump having a high pumping capacity) can be inserted into the steel pipe.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the installation method of the pumping well which can implement | achieve construction to a deep depth, and the steel pipe casing used by this method.

1 is an overall view of a steel pipe casing according to an embodiment of the present invention. It is an enlarged view of the 1st steel pipe member which comprises the steel pipe of the steel pipe casing shown in FIG. It is a perspective view of the front-end | tip part and cover body of the 1st steel pipe member shown in FIG. It is a front view of the front-end | tip part and cover body of the 1st steel pipe member shown in FIG. The state which attached the cover to the front-end | tip part of the 1st steel pipe member shown in FIG. 2 is shown, (A) is a front view, (B) is a side view. (A) is sectional drawing of the VIA-VIA part of FIG. 5 (A), (B) is sectional drawing of the VIB-VIB part of FIG. 5 (B). It is sectional drawing of the VII-VII part of FIG. 6 (B). It is a disassembled perspective view of the connection structure of the steel pipe member which comprises the steel pipe of the steel pipe casing shown in FIG. It is an expanded sectional view of the connection structure of the steel pipe member which comprises the steel pipe of the steel pipe casing shown in FIG. It is sectional drawing of the XX part of FIG. It is a top view of the pumping well installed by the installation method which concerns on embodiment of this invention using the steel pipe casing shown in FIG. It is a vertical sectional view of the pumping well installed by the installation method which concerns on embodiment of this invention using the steel pipe casing shown in FIG. It is a top view of the crushed stone wall comprised using the steel pipe casing shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, by using a steel pipe casing 1 and embedding a perforated pipe 20 that can be inserted into the steel pipe casing 1, pumping of the groundwater at a deep depth (for example, exceeding 30 m) can be performed. How to install a well is explained.

  First, the structure of the steel pipe casing 1 used with the installation method which concerns on this embodiment is demonstrated using FIGS.

  As shown in FIGS. 1 and 3, the steel pipe casing 1 includes a hollow steel pipe 2 and a lid 10 that is detachably attached to the tip of the steel pipe 2. Is provided with a spiral blade 32. The steel pipe 2 is configured by connecting a plurality of steel pipe members (the first steel pipe member 30 and the second steel pipe member 40). After the lid 10 is attached to the tip and screwed into the waste layer, It is a member that is pulled up and collected while removing the lid 10 in the waste layer and leaving the lid 10 at the tip of the drilling hole.

In the present embodiment, as shown in FIG. 1, the outer diameter D ₁ of the first portion (portion constituted by the first steel pipe member 30) extending a predetermined length from the tip of the steel pipe 2 is set as the first diameter of the steel pipe 2. It is set to be larger than the outer diameter D ₂ of the second portion excluding the first part (part composed of the second steel pipe member 40). Since the portion (first portion) extending a predetermined length from the tip of the steel pipe 2 is set to have a relatively large diameter in this way, a crushed stone column with a larger outer diameter can be built, and a crushed stone aggregate column is constructed. In doing so, the number of crushed stone pillars can be reduced and the cost can be reduced. The values of D ₁ and D ₂ can be appropriately set according to the scale (diameter and depth) of the pumping well to be installed. For example, the outer diameter D ₁ of the first portion is set within the range of 300～320Mm, the difference between the outer diameter D ₂ is set within the range of 250~270mm (D ₁ and D ₂ of the second portion Within a range of 30 to 70 mm).

  As shown in FIGS. 2 and 3, the first steel pipe member 30 constituting the first portion of the steel pipe 2 is provided with a spiral blade 32 on the outer periphery in the vicinity of the lid attachment side end (lower end). The main body 31 is provided. As described above, if the spiral blade 32 is attached to the outer periphery of the steel pipe member 30, the blade 32 can be obtained by rotating the device so that the spiral tip 32a of the blade 32 enters the waste layer. Since the waste and earth and sand are easily moved relatively upward so as to ride on the upper surface of the steel pipe casing 1, the steel pipe casing 1 itself can be easily screwed into the waste layer.

Most of the body portion 31 of the first steel member 30 has a relatively large outer diameter D _1. On the other hand, the main body 31 is formed such that the outer diameter gradually decreases as it approaches the end (upper end) 31a opposite to the end on the lid attachment side, and the outer diameter of the upper end 31a is the second end. The same outer diameter D _{2 as} that of the steel pipe member 40 is set. A female spline joint 50 (described later) that constitutes a connection structure for connection with the end of the second steel pipe member 40 is attached to the upper end 31 a of the main body 31 of the first steel pipe member 30.

  In this embodiment, as shown in FIGS. 4 and 5, when the main body 31 of the first steel pipe member 30 is developed on a plane, the angle formed by the attachment line of the blades 32 with respect to the horizontal direction is 10. The blades 32 are attached to the main body 31 so as to be in a range of ˜20 °. If the angle is less than 10 °, the effect of attaching the blades 32 is low. If the angle exceeds 20 °, the vertical approach distance with respect to the rotation of the steel pipe casing 1 becomes long, and the burden on the heavy machinery for screwing the steel pipe casing 1 increases. This is not preferable. The angle is preferably 10 ° to 15 °.

  The outer diameter of the blade 32 is preferably 1.5 to 3 times the outer diameter of the main body 31 to which the blade 32 is attached. If the outer diameter of the blade 32 is less than 1.5 times the outer diameter of the main body 31, the effect of attaching the blade 32 is low, and even if it exceeds three times, there is no difference in effect, and the steel pipe casing 1 is screwed in. This is not preferable because the burden on heavy machinery increases. In the present embodiment, the central angle of the spiral from the leading end 32a of the spiral of the blade 32 to the rear end 32b is 360 °, but is not limited to this configuration, and is 225 to 720 °. It may be in the range. When the angle is less than 225 °, the effect of moving the waste or earth and sand upward by the blades 32 is reduced, which is not preferable. In view of the ease of construction, 720 ° or less is preferable.

  In the present embodiment, as shown in FIG. 3, a projecting portion 33 is formed on the outer periphery in the vicinity of the lower end portion of the main body portion 31 of the first steel pipe member 30. When the lid body 10 is attached to the first steel pipe member 30, the protruding portion 33 covers the entire gap between the main body portion 11 (described later) of the lid body 10 and the first steel pipe member 30. As a result, when the steel pipe casing 1 is screwed into the waste layer, it is possible to prevent waste and earth and sand from entering the gap, and it is difficult to remove the lid 10 from the first steel pipe member 30. There is no fear of becoming.

  The lid 10 is attached to the tip of the first steel pipe member 30 to close the tip of the first steel pipe member 30 and prevents waste and earth and sand in the waste layer from entering the first steel pipe member 30. It is a member to do. Further, the tip of the perforated pipe 20 is also attached to the lid body 10, and the perforated pipe 20 is embedded at the same time as the steel pipe casing 1 is screwed into the waste layer.

  As shown in FIGS. 3 and 4, the lid body 10 has a cylindrical main body portion 11 whose front end is closed, and a steel pipe fixing cylinder 15 is disposed concentrically inside the main body portion 11 with a predetermined gap therebetween. Has been. And the front-end | tip of the 1st steel pipe member 30 is inserted in the gap | interval between the inner periphery of the main-body part 11 of the cover body 10, and the outer periphery of the steel pipe fixing cylinder 15, and the 1st steel pipe member 30 and the cover body 10 and Is to be locked.

  In the present embodiment, as a locking means between the first steel pipe member 30 and the steel pipe fixing cylinder 15, a locking piece 34 that protrudes inward in the vicinity of the inner peripheral tip of the main body 31 of the first steel pipe member 30. And a notch 16 is formed in the steel tube fixing cylinder 15 so as to cut into a substantially L shape.

  When attaching the lid 10 to the first steel pipe member 30, the first steel pipe member 30 is checked while confirming the position so that the locking piece 34 enters the notch 16 of the steel pipe fixing cylinder 15. The tip of the steel pipe member 30 is inserted between the main body part 11 of the lid 10 and the steel pipe fixing cylinder 14, and then the first steel pipe member 30 is rotated so that the locking piece 34 enters below the locking part 16a. The lid 10 and the first steel pipe member 30 are locked and integrated. It is preferable to provide two pairs of the notches 16 and the locking pieces 34 at symmetrical positions about the central axis of the first steel pipe member 30.

  When removing the lid 10 from the first steel pipe member 30, it may be lifted by rotating it in the direction opposite to the direction in which the first steel pipe member 30 is screwed. If it does in this way, the locking piece 34 will remove | deviate from the latching | locking part 16a, and will detach | leave easily.

  In the present embodiment, the example in which the notch portion 16 is provided in the steel pipe fixing cylinder 15 and the locking piece 34 is provided in the first steel pipe member 30 in consideration of the manufacturing cost is shown, but conversely, the steel pipe fixing cylinder 15 is provided. The notch 16 may be provided in the first steel pipe member 30.

  A perforated tube fixing cylinder 14 for attaching the tip of the perforated tube 20 via a predetermined gap is further provided inside the steel tube fixing tube 15 of the lid 10 in the present embodiment. They are arranged concentrically. When the inner periphery of the perforated tube fixing cylinder 14 is too larger than the outer periphery of the perforated tube 20, the work of attaching the perforated tube 20 to the perforated tube fixing cylinder 14 becomes complicated. It is preferable to adjust the inner circumference of the perforated pipe 20 to be slightly larger than the outer circumference of the perforated pipe 20 to be used.

  Further, in this embodiment, in order to make the screwing easier, the excavation blade 12 is attached to the tip of the main body 11 of the lid body 10 and two L-shaped excavation claws 13 are attached to the side surface. However, these may not be necessary. Moreover, you may provide the shape and number of excavation blades and excavation claws different from this embodiment. 5 and 6, with the first steel pipe member 30 attached to the lid 10, the tip 32a of the blade 32 is disposed at a position slightly protruding from the horizontal position of the excavation claw 13. However, the positional relationship is not particularly limited.

In the present embodiment, the distal end of the first steel pipe member 30 is inserted into the gap between the main body 11 of the lid body 10 and the steel pipe fixing cylinder 15 to lock the lid body 10 and the first steel pipe member 30. To do. Therefore, the outer diameter D ₁ of the front end portion of the first steel pipe member 30 is formed smaller than the inner diameter of the main body portion 11 of the lid body 10, and the inner diameter of the front end portion of the first steel pipe member 30 is the steel pipe fixed cylinder 15. It is formed larger than the outer diameter.

  In the present embodiment, as shown in FIGS. 5 and 6, the locking region between the first steel pipe member 30 and the lid body 10 is covered with the main body portion 11 of the lid body 10, and the front end is covered by the main body portion 11. All sides are blocked. For this reason, when the steel pipe casing 1 is screwed into the waste layer, the locking region does not directly contact the waste layer, and waste is entangled in the locking region, or waste or earth and sand adheres. Therefore, the screwing of the steel pipe casing 1 is not hindered, and the removal of the lid 10 from the first steel pipe member 30 is not hindered.

The 2nd steel pipe member 40 which comprises the 2nd part of the steel pipe ₂ has a main-body part which has the outer diameter D2 smaller than the outer diameter D1 of the _1st steel pipe member 30, as shown in FIG. ing. Thus, since the part (2nd part) except the part extended predetermined length from the front-end | tip of the steel pipe 2 is set to the comparatively small diameter, the surrounding surface at the time of pulling up the steel pipe casing 1 from a to-be-processed layer or a crushed stone aggregate pillar Friction can be reduced and workability can be improved.

  Here, the connection structure for connecting the 1st steel pipe member 30 and the 2nd steel pipe member 40 is demonstrated using FIGS. 8-10. In addition, this connection structure is employ | adopted also for the connection of the 2nd steel pipe members 40.

  This connection structure has a cylindrical female spline joint 50 fixed to the upper end of the first steel pipe member 30 (lower steel pipe member) to be connected and the lower end of the second steel pipe member 40 (upper steel pipe member) to be connected. A cylindrical male spline joint 60 fixed to the two, and a bolt (joint fixing means) 70 for fixing the two spline joints 50 and 60 to each other.

  As shown in FIGS. 9 and 10, the outer diameter surface of the upper end portion 31 a of the first steel pipe member 30 to be connected is fitted into the engagement step portion 51 on the inner diameter surface of the lower end portion of the female spline joint 50. In the fitting portion, the female spline joint 50 and the first steel pipe member 30 are fixed by welding 52. On the other hand, the lower end portion of the second steel pipe member 40 that is another connection target is fixed to the upper end portion of the male spline joint 60 by welding 61.

  As shown in FIGS. 8 to 10, the female spline joint 50 is provided with a certain length of female spline 53 at a constant pitch in the circumferential direction downward from the upper end of the inner peripheral surface thereof, and the lower end of each female spline 53 is closed. It has been. Further, on the outer peripheral surface of the female spline joint 50, an appropriate number of a pair of upper and lower countersink recesses 54 are provided in the circumferential direction so as to avoid the female spline 53, and through holes 55 are formed at the bottom of each countersink recess 54. Is provided.

  As shown in FIGS. 8 to 10, the male spline joint 60 has a constant pitch in the circumferential direction so that a male spline 62 having a predetermined length can be fitted to the female spline 53 upward from the lower end of the outer peripheral surface thereof. Is provided. In addition, a pair of upper and lower screw holes 63 are provided in positions between the male splines 62 at positions that match the through holes 55 of the female spline joint 50. A bolt 70 as a joint fixing means is screwed into the screw hole 63 from the countersink recess 54 through the through hole 55.

  In the present embodiment, male and female spline joints 50 and 60 having a relatively large diameter are employed, and the female spline joint 50 is attached to the outer side in the radial direction of the first steel pipe member 30 as shown in FIG. . Moreover, since the inner peripheral surface of the male spline joint 60 disposed on the inner periphery of the female spline joint 50 is substantially flush with the inner peripheral surfaces of the upper and lower steel pipe members 30 and 40 and does not protrude into the steel pipe 2. A wide internal space of the steel pipe 2 can be secured. As a result, it is possible to insert a relatively large diameter device (for example, a large pump having a high pumping capacity) into the steel pipe 2. Further, the torsional load at the time of press-fitting is supported by the meshing portions of the male and female splines 53 and 62, and the load in the drawing direction is supported by each bolt 70.

  Next, the perforated pipe | tube 20 used with the installation method which concerns on this embodiment is demonstrated.

  In the present embodiment, a relatively large diameter SUS pipe having air permeability and water permeability is adopted as the perforated pipe 20. The perforated tube 20 in the present embodiment has its tip attached to the lid 10 in advance. Specifically, as shown in FIG. 6 (A), it is only necessary to fix the hole 21 of the perforated tube 20 and the through hole 14a of the perforated tube fixing cylinder 14 through a cutting bar 41.

  Note that the means for attaching the tip of the perforated tube 20 to the lid 10 is not limited to the cutting bar 41, and a wire or the like may be used. It is preferable that the front end protruding from the through hole 14a can be fixed with a nut. The diameter of the cutting bar 41 is about 6 to 15 mm.

  Then, the installation method of the pumping well which concerns on this embodiment is demonstrated using FIG.11 and FIG.12.

In the steel pipe casing 1 used in the present embodiment, the outer diameter D ₁ of the first portion extending from the tip of the steel pipe 2 for a predetermined length is set to the outside of the second portion excluding the first portion of the steel pipe 2. It is set larger than the diameter D _2. Moreover, the steel pipe 2 is comprised by connecting the some steel pipe members 30 * 40. That is, in this embodiment, the steel pipe casing 1 is prepared through processes corresponding to the “steel pipe diameter adjusting process” and the “steel pipe member connecting process” in the present invention.

First, the lid 10 is directed downward with the lid 10 attached to the tip of the first steel pipe member 30 constituting the steel pipe 2 of the steel pipe casing 1, and the steel pipe 2 is rotated by a heavy machine. The steel pipe casing 1 is screwed into the layer 80 to be treated. Then, when the lid body 10 reaches a predetermined depth, the crushed stone S is put into the steel pipe 2 after the lid body 10 is removed from the steel pipe 2, and then the steel pipe 2 is rotated in the reverse direction to leave the lid body 10 and the crushed stone S. to construction crushed stone columns C _S by pulling the steel pipe 2 in the axial direction Te. Such lithotripsy Column C _S a plurality in the same procedure, by construction by spaced apart from each other at predetermined intervals G, constitutes a crushed stone aggregate columns C _A (collectively pillar configuration step). In the present embodiment, it is set to be configured as shown in FIG. 11, a plan view hexagonal crushed stone aggregate columns C _A consisting of seven crushed stone pillars C _S. In the present embodiment, the gap G of the gap provided between the crushed stone column C _S, the blade 32 from the outer peripheral surface of the main body portion 31 of the first steel member 30 constituting the steel pipe casing 1 protrudes outward It is set to about twice the size.

Next, with the perforated pipe 20 inserted into the steel pipe 2 and the first steel pipe member 30 constituting the steel pipe 2 being attached to the lid body 10, the lid body 10 is directed downward and rotated to the steel pipe 2 by heavy equipment. the giving, screwing the steel casing 1 at the center portion of the crushed stone aggregate columns C _a shown in FIGS. 11 and 12. Then, when the lid body 10 reaches a predetermined depth, the lid body 10 and the perforated pipe 20 are removed from the steel pipe 2, and then the steel pipe 2 is reversely rotated to leave the lid body 10 and the perforated pipe 20 and the steel pipe 2 is removed. by pulling in the axial direction, to embed the perforated pipe 20 to the crushed stone aggregate column C _a (perforated pipe embedding step). By going through these process groups, a pumping well capable of pumping up groundwater at a deep depth (for example, exceeding 30 m) will be installed.

In the steel pipe casing 1 according to the embodiment described above, the portion (first portion) extending a predetermined length from the tip of the steel pipe 2 is set to have a relatively large diameter D ₁ , and therefore, the crushed stone using the steel pipe casing 1 is used. when configuring a pillar C _S, it can be construction more crushed stone pillar C _S of larger outer diameter. Therefore, when a plurality of crushed stone columns C _S are assembled to form the crushed stone column C _A , it is possible to reduce the number of crushed stone columns C _S and reduce the cost. Further, since the setting part (second part) excluding the portion for a predetermined Uncompressed standing from the front end of the steel pipe 2 of the steel pipe casing 1 relatively small diameter D _2, constituting the crushed stone pillar C _S with a steel casing 1 when or installing the perforated pipe 20 to or crushed stone column C _S that, by reducing the skin friction when pulling a steel casing 1 from the treatment layer 80 and crushed stone columns C _S, to improve the workability Can do.

  Moreover, in the steel pipe casing 1 which concerns on embodiment described above, the internal peripheral surface of the male spline joint 60 which connects the steel pipe members 30 * 40 is arrange | positioned on the substantially the same surface as the internal peripheral surface of the steel pipe members 30 * 40. Since the male spline joint 60 does not protrude into the steel pipe members 30 and 40, a wide internal space of the steel pipe 2 can be secured. Accordingly, it is possible to insert a relatively large diameter device (for example, a large pump having a high pumping capacity) into the steel pipe 2.

Also, more than in the method of installing the pumping wells according to the embodiment described, the crushed stone aggregate columns C _A composed of a plurality of crushed stone pillar C _S using first a steel casing 1 constitutes a processed layer 80, then the steel pipe casing 1 by embedding the perforated pipe 20 to the crushed stone aggregate columns C _a may be installed pumping wells used. Here, since the set to a relatively large diameter D ₁ of the portion (first portion) by a predetermined Uncompressed standing from the front end of the steel pipe 2 of the steel pipe casing 1, which construction more crushed stone pillar C _S of larger outer diameter that can be, also, because of the construction by spaced apart from each other at a plurality of crushed stone column C _S a predetermined distance G, reduce the construction number of crushed stone column C _S when configuring the crushed stone aggregate columns C _a Thus, cost reduction can be realized. Further, since the setting part (second part) excluding the portion for a predetermined Uncompressed standing from the front end of the steel pipe 2 of the steel pipe casing 1 relatively small diameter D _2, the steel pipe from the treatment layer 80 and crushed stone aggregate columns C _A The circumferential friction at the time of pulling up the casing 1 can be reduced and workability can be improved. Further, by providing a gap between crushed stone column C _S during the construction of the plurality of crushed stone column C _S, reducing the skin friction and soil resistance acting on the steel pipe casing 1 when crushed stone column C _S construction Can do. As a result, drilling can be performed to a deeper depth, and a pumping well having a higher function can be installed. Incidentally, since the even though the gap is provided between crushed stone column C _S, the outer periphery of the steel tube casing 1 spiral blade 32 is provided at the time of construction a plurality of crushed stone column C _S, in the gap Wastes and the like can be sufficiently disturbed, and water permeability can be secured.

  Moreover, in the method which concerns on embodiment described above, the some steel pipe member 30 * 40 can be connected and the elongate steel pipe 2 can be comprised. At this time, the male and female spline joints 50 and 60 fixed in advance to the connection ends of the upper and lower steel pipe members 30 and 40 are fitted together, and the splicing joints 50 and 60 are fastened by the bolts 70 to complete the connection work quickly. And sufficient strength against torsional load and pull-out load can be exhibited.

  Moreover, in the method which concerns on embodiment described above, the internal peripheral surface of the male spline joint 60 and the internal peripheral surface of the steel pipe members 30 and 40 are arrange | positioned on the substantially the same surface, The male spline joint 60 is a steel pipe member. Since it does not protrude into the inside of 30 and 40, the internal space of the steel pipe 2 can be ensured widely. As a result, it is possible to insert a relatively large diameter device (for example, a large pump having a high pumping capacity) into the steel pipe 2.

In the present embodiment, an example in which the perforated pipe 20 is screwed together with the steel pipe 2 and the lid body 10 in the perforated pipe embedding process is shown. However, after the steel pipe 2 and the lid body 10 are screwed in, the perforated pipe 20 is perforated. may be by inserting a tube 20 into the steel pipe 2 is embedded perforated pipe 20 to the crushed stone aggregate columns C _a. That is, toward the lid 10 downward in a state of mounting only the first steel member 30 constituting the steel pipe 2 to the lid 10, screwed steel pipe casing 1 in crushed stone aggregate columns C _A giving rotation to the steel pipe 2 When the lid body 10 reaches a predetermined depth, the perforated pipe 20 is inserted into the steel pipe 2 to allow the perforated pipe 20 to reach the lid body 10, and then the lid body 10 is removed from the steel pipe 2. The perforated pipe can be embedded in the crushed stone aggregate column C _A by rotating the steel pipe 2 in the reverse direction and leaving the lid 10 and the perforated pipe 20 and pulling up the steel pipe 2 in the axial direction.

Further, in the present embodiment has shown an example in which the plan view hexagonal crushed stone aggregate columns C _A consisting of seven crushed stone pillars C _S, the number and crushed stone aggregate crushed stone pillars constituting the crushed stone aggregate column The planar shape of the column is not limited to this. For example, a crushed stone aggregate column having a substantially triangular shape in plan view composed of four crushed stone columns, a crushed stone aggregate column having a substantially square shape in plan view composed of five crushed stone columns, and the like may be configured.

  In the present embodiment, the female spline joint 50 is fixed to the first steel pipe member 30 (lower steel pipe member) constituting the steel pipe 2, and the male spline joint 60 is attached to the second steel pipe member 40 (upper steel pipe member). Although the example which adhered is shown, you may replace a male and female spline coupling. That is, the male spline joint 60 can be fixed to the first steel pipe member 30 (lower steel pipe member) constituting the steel pipe 2, and the female spline joint 50 can be fixed to the second steel pipe member 40 (upper steel pipe member).

Further, in the present embodiment has shown an example in which the plurality of crushed stone columns C _S plan view hexagonal crushed stone aggregate columns C _A consisting of using a steel casing 1, as shown in FIG. 13, the steel pipe A plurality of crushed stone pillars C _S arranged in a certain direction using the casing 1 can be constructed to form a crushed stone wall C _W having a predetermined width extending in a substantially straight line in plan view. When such a crushed stone wall C _W is configured, a perforated tube 20 is embedded in the crushed stone column C _S constituting the crushed stone wall C _W using the steel pipe casing 1. The groundwater can be pumped up through the perforated pipe 20.

  The present invention is not limited to the above-described embodiment, and those in which those skilled in the art appropriately modify the design are included in the scope of the present invention as long as they have the features of the present invention. . That is, each element provided in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those illustrated, but can be appropriately changed (for example, the male and female spline joints are switched upside down. Can do). Moreover, each element with which the said embodiment is provided can be combined as much as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe casing 2 ... Steel pipe 10 ... Lid 20 ... Perforated pipe 30 ... First steel pipe member (lower steel pipe member)
32 ... Blade 40 ... Second steel pipe member (upper steel pipe member)
50 ... Female spline joint 60 ... Male spline joint 70 ... Bolt (Fitting fixing means)
80 ... to be treated layer C _A ... crushed stone aggregate columns C _S ... crushed stone pillars S ... crushed stone

Claims (7)

A hollow steel pipe, and a lid body detachably attached to the tip of the steel pipe,
A spiral blade is provided on the outer periphery near the tip of the steel pipe,
The diameter of the first part extending a predetermined length from the tip of the steel pipe is set larger than the diameter of the second part excluding the first part of the steel pipe,
Steel pipe casing. The steel pipe is configured by connecting a plurality of steel pipe members via a spline joint, and the inner peripheral surface of the spline joint and the inner peripheral surface of the steel pipe member are arranged on substantially the same plane. ,
The steel pipe casing according to claim 1. A steel pipe casing provided with a hollow steel pipe and a lid body detachably attached to the tip of the steel pipe and provided with a spiral blade on the outer periphery in the vicinity of the tip of the steel pipe, and having a hole for passing water, A method of burying a perforated pipe that can be inserted into a steel pipe casing and installing a pumping well,
A steel pipe diameter adjusting step for setting the diameter of the first portion extending a predetermined length from the tip of the steel pipe to be larger than the diameter of the second portion excluding the first portion of the steel pipe;
When the steel pipe is attached to the lid body, the lid body is turned downward, the steel pipe casing is rotated by rotating the steel pipe, and the lid body reaches a predetermined depth. After the lid is removed from the steel pipe, the crushed stone is put into the steel pipe, and then the steel pipe is rotated in the reverse direction to leave the lid and the crushed stone, and the steel pipe is pulled up in the axial direction to construct a crushed stone column. A plurality of the crushed stone pillars are separated from each other at a predetermined interval to construct a crushed stone aggregate pillar;
With the perforated pipe inserted into the steel pipe and the steel pipe attached to the lid body, the lid body is directed downward, the steel pipe is rotated and the steel pipe casing is screwed into the crushed stone collecting column. When the lid body reaches a predetermined depth, the lid body and the perforated pipe are removed from the steel pipe, and the steel pipe is reversely rotated to leave the lid body and the perforated pipe in the axial direction. A perforated pipe embedding step of embedding the perforated pipe in the crushed stone collecting column,
How to install a pumping well. A steel pipe casing provided with a hollow steel pipe and a lid body detachably attached to the tip of the steel pipe and provided with a spiral blade on the outer periphery in the vicinity of the tip of the steel pipe, and having a hole for passing water, A method of burying a perforated pipe that can be inserted into a steel pipe casing and installing a pumping well,
A steel pipe diameter adjusting step for setting the diameter of the first portion extending a predetermined length from the tip of the steel pipe to be larger than the diameter of the second portion excluding the first portion of the steel pipe;
When the steel pipe is attached to the lid body, the lid body is turned downward, the steel pipe casing is rotated by rotating the steel pipe, and the lid body reaches a predetermined depth. After the lid is removed from the steel pipe, the crushed stone is put into the steel pipe, and then the steel pipe is rotated in the reverse direction to leave the lid and the crushed stone, and the steel pipe is pulled up in the axial direction to construct a crushed stone column. A plurality of the crushed stone pillars are separated from each other at a predetermined interval to construct a crushed stone aggregate pillar;
With the steel pipe attached to the lid body, the lid body is directed downward, the steel pipe is rotated to screw the steel pipe casing into the crushed stone collecting column, and the lid body reaches a predetermined depth. At the time, the perforated pipe is inserted into the steel pipe, and after the perforated pipe reaches the lid body, the lid body is removed from the steel pipe, and the steel pipe is rotated in the reverse direction so that the lid body and the perforated pipe A perforated pipe embedding step of embedding the perforated pipe in the crushed aggregate column by pulling up the steel pipe in the axial direction, leaving
How to install a pumping well. A steel pipe member connecting step of connecting a plurality of steel pipe members to constitute the steel pipe;
In the steel pipe member connecting step, a cylindrical female spline joint is fixed to the upper end of the lower steel pipe member to be connected, and a cylindrical male spline joint is fixed to the lower end of the upper steel pipe member to be connected. Fitting each other in the vertical direction, the two spline joints are fixed by joint fixing means,
The installation method of the pumping well of Claim 3 or 4. A steel pipe member connecting step of connecting a plurality of steel pipe members to constitute the steel pipe;
In the steel pipe member connecting step, a cylindrical male spline joint is fixed to the upper end of the lower steel pipe member to be connected, and a cylindrical female spline joint is fixed to the lower end of the upper steel pipe member to be connected. Fitting each other in the vertical direction, the two spline joints are fixed by joint fixing means,
The installation method of the pumping well of Claim 3 or 4. The inner peripheral surface of the male spline joint and the inner peripheral surface of the steel pipe member are arranged on substantially the same plane.
The installation method of the pumping well of Claim 5 or 6.

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