JP4863323B2 - Well drilling / well water pumping method and well drilling / well water pumping device - Google Patents

Description

  The present invention relates to a well excavation / well water pumping method and a well excavation / well water pumping apparatus that can easily provide a deep well having a relatively small diameter.

  As shown in FIG. 8 (a), a conventional well drilling / well water pumping method is performed by first connecting a drilling hydraulic pump 101 to the base end of the drilling pipe 100 and connecting the tip of the drilling pipe 100 to the tip of the drilling pipe 100. High pressure water is ejected vigorously from the jet nozzle 100a provided, and the excavation pipe 100 is advanced in the ground while making the excavation hole H, and excavation is performed until the tip end side of the excavation pipe 100 reaches the groundwater layer W. I was going.

  The determination as to whether or not the excavation pipe 100 has reached the groundwater layer W is based on the state of sludge water that overflows to the ground through the gap between the outer peripheral surface of the excavation pipe 100 and the excavation hole H. I was observing. The sludge water is a mixture of water ejected from the excavation pipe 100, soil, sand, and the like.

  When it is determined from this sludge water state that the tip end side of the excavation pipe 100 has reached the groundwater layer W, the excavation pipe 100 is extracted from the excavation hole H, and as shown in FIG. Is inserted into the drilling hole H. The outer pipe 102 has a plurality of water intake holes 102a on the peripheral wall on the distal end side. The outer pipe 102 is disposed in the excavation hole H so that the water intake hole 102 a of the outer pipe 102 enters the groundwater layer W.

  Next, as shown in FIG. 8C, the water absorption pipe 103 is disposed in the outer pipe 102, and the water absorption pump 104 is connected to the proximal end portion of the water absorption pipe 103.

  Finally, as shown in FIG. 9, the water absorption pump 104 is operated to pump up water in the groundwater layer W through the water absorption pipe 103.

  In addition, as another conventional excavation method of a well, for example, as disclosed in Patent Document 1, there is a method of construction using a rotary percussion drill. This rotary percussion drill is composed of a guide cell that can be moved up and down in the main body, a drill head that can be moved up and down in this guide cell, and a double pipe that is attached to the drill head. Has been.

  This double pipe is composed of an inner pipe and an outer pipe, and a bit is provided at the leading edge thereof. The double pipe is attached to the drill head, and the double pipe is struck, rotated and fed by the drill head, and the short pipe is sequentially added to the groundwater layer W. In this case, the cutting water is supplied to either the inner pipe or the gap between the inner and outer pipes and excavated while being circulated.

  Next, the inner tube is extracted, and the protective tube is inserted into the outer tube to a predetermined depth so as to leave only the outer tube. A slit, which is a plurality of openings, is formed on the outer peripheral surface on the lower end side of the protective tube, and a cylindrical protective tube filter is attached to the outer periphery thereof.

  Next, the outer tube is pulled out, and a seal ring is inserted from the upper part along the outer periphery of the protective tube to a predetermined depth in the upper portion of the hole to seal between the hole inner wall and the outer periphery of the protective tube. Then, a solidifying material such as cement mortar is filled up to the ground surface on the seal ring, and the upper end of the protective tube is fixed to the ground.

  Finally, a pumping pipe having a strainer at the lower end is inserted at a predetermined depth (below the well water surface), and its upper end is connected to a ground well pump.

JP-A-9-291777

  However, in the conventional well drilling / well water pumping method shown in FIG. 8, a step of drilling with the drilling pipe 100, a step of extracting the drilling pipe 100 from the drilling hole H, and an outer pipe 102 in the drilling hole H are provided. Each of the step of inserting and the step of arranging the water absorption pipe 103 in the outer pipe 102 and pumping up well water is performed individually and is multi-step, so a series of work is very troublesome and the whole work The time was also long.

  Further, during excavation, the water ejected from the excavation pipe 100 and the sludge mixed with soil, sand, etc. overflow through the gap between the outer peripheral surface of the excavation pipe 100 and the excavation hole H to the ground. Therefore, for example, when excavating to a depth of 100 m or more in the ground, the excavation hole H tends to collapse due to erosion due to overflow.

  When the excavation pipe 100 is extracted in a state where the excavation hole H is easily collapsed and the outer pipe 102 is inserted into the excavation hole H, the excavation hole H may be collapsed.

  For this reason, the depth of the excavation hole H is limited to about 4 m to 5 m at most, and the efficiency of excavation work has been extremely deteriorated.

  In addition, in the conventional method for excavating and pumping well water, it is determined whether or not the tip of the excavation pipe 100 has reached the groundwater layer W between the outer peripheral surface of the excavation pipe 100 and the excavation hole H. Because we were observing the state of the sludge water that overflowed to the ground through the gaps in the area, we had to rely on the feeling of skilled craftsmen, and the excavation pipe 100 actually reached the underground water layer W I couldn't understand exactly whether or not.

  For this reason, when wells were provided, there were frequent situations where a sufficient amount of water could not be pumped.

  Further, in the conventional well drilling / well water pumping method, as shown in FIG. 9, a water absorption pipe 103 is arranged in the outer pipe 102 to pump water in the groundwater layer W. If the water in the groundwater layer W does not enter the outer pipe 102 until the predetermined height is reached, the water in the groundwater layer W cannot be actually pumped up by the water absorption pipe 103.

  In short, in order to pump up the water in the groundwater layer W in the conventional method, the water level S of the water in the groundwater layer W entering the outer pipe 102 has to be high.

  On the other hand, in the case of the well excavation method shown in Patent Document 1, since the excavation work is performed using a rotary percussion drill attached to a heavy machine, the excavation work becomes very large and requires a large amount of cost. Had.

  In addition, in the case of the well excavation method shown in Patent Document 1, in addition to the protection tube being inserted to a predetermined depth in the long and thin cylindrical outer tube, the protection tube filter protrudes from the lower end side of the protection tube. The cylindrical fibers having a predetermined thickness formed by a non-woven fabric having an outer diameter approximately equal to the inner diameter of the outer tube are stacked, and the non-woven fabric has a close eye inside. Due to the structure in which the eyes gradually become rougher toward the outside, there is a problem that the pumping efficiency tends to deteriorate when the amount of water in the groundwater layer W decreases.

  Therefore, the present invention was created in view of the existing circumstances as described above, and the excavation construction of the well and the pumping up of the well water can be performed easily and quickly without using heavy equipment, The purpose is to provide a well drilling / well water pumping method and a well drilling / well water pumping device that can efficiently pump the water in the groundwater layer regardless of the depth of the groundwater layer and the amount of water. And

  The well excavation / well water pumping method according to the present invention has a nozzle at the tip and a plurality of water intake holes on the peripheral wall of the tip, and the tip of the inner tube is directed to the nozzle of the outer tube. Assembling process to fix it in the back, and connecting a hydraulic pump for excavation to the base end side of the inner pipe, feeding the water into the inner pipe and proceeding the outer pipe in the ground while ejecting water from the nozzle of the outer pipe After the excavation process and the outer pipe reaches the groundwater layer, the inner pipe is removed from the outer pipe, a water absorption pump is connected to the proximal end of the outer pipe, and water is pumped up through the outer pipe. The above-mentioned problem was solved by comprising a pumping process.

  In addition, the water pumping process solved the above-mentioned problem by sucking up the water by making the inside of the outer tube into a vacuum state with a water absorption pump.

  Furthermore, the well excavation / well water pumping device according to the present invention has a nozzle at the tip, an outer tube having a plurality of water intake holes on the peripheral wall on the tip, and the tip is directed to the nozzle of the outer tube. It is composed of an inner pipe that is fixed in such a way that a drilling hydraulic pump can be connected to the base end side of the inner pipe, and a water absorption pump can be connected to the base end side of the outer pipe from which the inner pipe has been removed. As a result, the above-mentioned problem has been solved.

  Further, the outer tube nozzle is provided with a female screw portion on the inner peripheral surface, while a male screw portion is provided on the outer peripheral surface of the inner tube tip portion, and the male screw portion of the inner tube is connected to the female screw portion of the nozzle of the outer tube. The above-mentioned problem has been solved by fixing the inner tube in the outer tube by screwing together.

  In addition, the outer pipe is provided with a non-woven net for sand prevention on the tip end side having a plurality of water intake holes, thereby solving the above-mentioned problem.

  Moreover, the ratio of the diameter of an outer tube | pipe and an inner tube | pipe is about 2: 1, The problem mentioned above was solved similarly.

  In addition, the length of the portion having the water intake hole in the outer pipe is approximately 50 cm to 1 m, thereby solving the above-described problem.

  The well excavation / well water pumping method according to the present invention has a nozzle at the tip and a plurality of water intake holes on the peripheral wall of the tip, and the tip of the inner tube is directed to the nozzle of the outer tube. Assembling process to fix it in the back, and connecting a hydraulic pump for excavation to the base end side of the inner pipe, feeding the water into the inner pipe and proceeding the outer pipe in the ground while ejecting water from the nozzle of the outer pipe After the excavation process and the outer pipe reaches the groundwater layer, the inner pipe is removed from the outer pipe, a water absorption pump is connected to the proximal end of the outer pipe, and water is pumped up through the outer pipe. Therefore, the well excavation work and the well water pumping operation can be performed easily and quickly without using heavy equipment.

  Further, according to the present invention, when the outer pipe is advanced in the ground while water is spouted and the tip of the outer pipe reaches the groundwater layer, the outer pipe is left in the excavation hole as it is. By removing the inner pipe from the pipe and connecting a water absorption pump to the base end side of the outer pipe, water in the groundwater layer can be pumped through the outer pipe.

  In other words, the outer pipe is used both when excavating a well and when pumping well water. Therefore, after drilling using a drilling pipe, after extracting the drilling pipe from the drilling hole, and then reinserting the outer pipe into the drilling hole, as in conventional well drilling and well water pumping methods The overall work time can be greatly shortened by omitting.

  In addition, the water pumping process draws up the water inside the outer tube by using a water absorption pump to suck up water, so that a sufficient amount of water can be efficiently supplied over a long period of time regardless of the depth of the groundwater layer or the amount of water. Can be pumped up.

  Specifically, for example, even when the outer tube itself is relatively long, as long as the tip end side of the outer tube reaches the groundwater layer, the water in the groundwater layer can be surely pumped up.

  Also, if the tip of the outer pipe reaches the groundwater layer, the water inside the outer pipe can be evacuated by the water suction pump to reliably suck up water, as in conventional well drilling and well water pumping methods, Under normal conditions, there is no influence of the water level entering the outer tube.

  On the other hand, the well excavation / well water pumping device according to the present invention has a nozzle at the tip, an outer pipe having a plurality of water intake holes on the peripheral wall on the tip, and the tip is directed to the nozzle of the outer pipe. It is composed of an inner pipe that is fixed in such a way that a drilling hydraulic pump can be connected to the base end side of the inner pipe, and a water absorption pump can be connected to the base end side of the outer pipe from which the inner pipe has been removed. Therefore, it is possible to easily and quickly perform well excavation work and well water pumping work without using heavy machinery.

  In addition, such a well drilling / well water pumping device can be configured relatively simply to reduce the manufacturing cost of the device.

  Further, the nozzle of the outer tube is provided with a female screw portion on the inner peripheral surface, while a male screw portion is provided on the outer peripheral surface of the tip portion of the inner tube, and the male screw portion of the inner tube is connected to the female screw portion of the nozzle of the outer tube. Since the inner pipe is fixed in the outer pipe by being screwed together, the inner pipe can be inserted into the outer pipe and fixed easily when excavating the well.

  And there is a groundwater layer by connecting a hydraulic pump for excavation to the proximal end side of the inner pipe, feeding water into the inner pipe and making the outer pipe advance in the ground while spouting water from the nozzle of the outer pipe For example, it can be easily excavated to a depth of 100 m or more.

  At this time, a part of the water ejected from the nozzle becomes sludge mixed with soil and sand and overflows to the ground through the gap between the outer peripheral surface of the outer pipe and the drilling hole, but the outer pipe is excavated. Since the state left as it is in the hole is maintained, there is no possibility that the excavation hole collapses.

  In addition, when pumping up well water, the inner pipe is extracted from the outer pipe, a water absorption pump is connected to the proximal end of the outer pipe, and water is pumped through the outer pipe, making it easy to drain water from the groundwater layer. Can be pumped up.

  Moreover, the outer pipe is used for both well excavation and well water pumping work. By omitting the steps of extracting the excavation pipe from the excavation hole and re-inserting the outer pipe into the excavation hole, the entire work time can be greatly shortened.

  In addition, since the outer pipe is provided with a non-woven net for sand control on the tip end side having a plurality of water intake holes, it prevents the occurrence of a situation where sand enters the outer pipe, Water from the groundwater layer can be taken in.

  In addition, the ratio of the diameter of the outer pipe and the inner pipe is about 2: 1, and in the pumping work of the well water, the diameter of the outer pipe itself is larger than the diameter of the inner pipe to be removed. The amount of water pumped up by the outer pipe can be increased.

  In addition, when excavating a well in which the inner pipe is fixed in the outer pipe, a predetermined space exists between the inner peripheral wall of the outer pipe and the outer peripheral wall of the inner pipe. Therefore, when the tip of the outer pipe reaches the groundwater layer, water rapidly enters the outer pipe from the intake hole of the outer pipe and moves upward through the space between the inner peripheral wall of the outer pipe and the outer peripheral wall of the inner pipe. , Overflowing to the ground.

  As a result, anyone can easily understand that the distal end side of the outer pipe has reached the groundwater layer, and the subsequent work can be performed smoothly.

  In addition, since the length of the portion having the water intake holes in the outer pipe is approximately 50 cm to 1 m, when the distal end side of the outer pipe reaches the groundwater layer, a sufficient amount of water is passed through these water intake holes. Can be taken into the outer tube and pumped up.

It is a side view which shows the structure of an outer tube | pipe. It is a perspective view which shows the structure of the water intake hole part of an outer tube | pipe. It is a perspective view which shows the state which inserted the inner pipe | tube in an outer pipe | tube, and fixed the front end of the inner pipe | tube in the nozzle of the outer pipe. It is sectional drawing which shows the state of excavation construction of a well. It is sectional drawing which shows the state which the front-end | tip part side of the outer pipe | tube reached the groundwater layer in the excavation construction of a well. It is sectional drawing which shows the state which extracted the inner pipe | tube from the outer pipe | tube which the front-end | tip part side has reached the groundwater layer. It is sectional drawing which shows the state which pumps up the water of a groundwater layer by connecting a water absorption pump to the outer pipe | tube which the front-end | tip part side has reached the groundwater layer. The conventional method of excavating and pumping up well water is shown. (A) is a cross-sectional view of a state where the excavation pipe is used for excavation of the well, and (b) is an excavation pipe extracted from the excavation hole. Sectional drawing of the state which inserted the outer pipe in the hole, (c) is sectional drawing of the state which has arrange | positioned the water absorption pipe in the outer pipe. It is a sectional view showing a state of pumping well water by arranging a water absorption pipe in the outer pipe and connecting a water absorption pump to the base end of the water absorption pipe, showing a conventional method for well drilling and well water pumping .

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 3 and 4, the well excavating apparatus and well water pumping apparatus according to the present invention includes an outer pipe 1 and an inner pipe 2 disposed in the outer pipe 1.

  As shown in FIGS. 1 and 2, the outer tube 1 is provided with a nozzle 3 at the tip. Further, the outer tube 1 is provided with a plurality of water intake holes 4 in the peripheral wall on the distal end side.

  As shown in FIG. 3, the inner tube 2 is detachably fixed in the outer tube 1 so that the tip thereof is directed to the nozzle 3 of the outer tube 1. The ratio of the diameters of the outer tube 1 and the inner tube 2 is set to approximately 2: 1.

  4 and 5, the excavating hydraulic pump 11 is connected to the proximal end side of the inner pipe 2, so that high-pressure water is fed into the inner pipe 2 and provided at the distal end of the outer pipe 1. The nozzle 3 is formed so that water can be ejected vigorously.

  Further, as shown in FIG. 7, a water suction pump 10 is connected to the base end side of the outer pipe 1 via an elbow pipe 9, so that the nozzle 3 and water intake provided on the distal end side of the outer pipe 1 are connected. It is formed so as to suck up water in the groundwater layer W from the hole 4. At this time, the inner tube 2 is removed from the outer tube 1.

  The outer tube 1 is formed of a cylindrical material such as steel or polyethylene having a length of about 8 m to 10 m and an inner diameter of about 30 mm. As shown in FIGS. 1 and 2, a nozzle 3 having an inner diameter of about 15 mm is provided at the distal end of the outer tube 1 through a tapered portion 5 having a conical diameter. An internal thread portion 6 is provided on the inner peripheral surface of the nozzle 3.

  A stopper portion 12 is provided at the opening edge of the tip of the nozzle 3 in order to lock the tip of the inner tube 2 screwed into the female screw portion 6 from the inside. The stopper portion 12 is formed in a tapered shape having a conical diameter.

  In addition, a plurality of water intake holes 4 having a diameter of about 6 mm are formed on the peripheral wall on the distal end side of the outer tube 1 positioned above the tapered portion 5 of the outer tube 1 over a length of about 50 cm to 1 m. Provided. Further, a non-woven net 8 for preventing sand is wound around the peripheral wall on the distal end side of the outer tube 1 so as to cover the water intake hole 4. This sandless nonwoven net 8 is fixed to the outer tube 1 using, for example, a copper wire.

  On the other hand, the inner tube 2 is formed of a cylindrical material such as steel or polyethylene having a length of about 8 m to 10 m, which is substantially the same as the outer tube 1, and an inner diameter of about 15 mm, which is about half of the outer tube 1. As shown in FIG. 3, a male screw portion 7 is provided on the outer peripheral surface of the tip portion.

  At the time of excavation of the well, as shown in FIG. 3, the inner tube 2 is inserted into the outer tube 1, and the male screw portion 7 provided at the distal end portion of the inner tube 2 is provided at the distal end portion of the outer tube 1. The inner tube 2 is fixed in the outer tube 1 by being screwed into the female screw portion 6 of the nozzle 3 from the inside.

  Then, as shown in FIG. 4, a water pressure pump 11 for excavation is connected to the base end side of the inner pipe 2, high pressure water is fed into the inner pipe 2, and from the nozzle 3 provided at the distal end portion of the outer pipe 1. Water is ejected vigorously to excavate underground.

  On the other hand, at the time of pumping up the well water, as shown in FIG. 6, the male screw portion 7 provided at the tip portion of the inner tube 2 is removed from the female screw portion 6 of the nozzle 3 provided at the tip portion of the outer tube 1. Then, the inner tube 2 is removed from the outer tube 1.

  After that, as shown in FIG. 7, a water absorption pump 10 is connected to the base end side of the outer tube 1 via an elbow tube 9, and the outer tube 1 is evacuated by the water absorption pump 10, thereby The water in the groundwater layer W is sucked up from the nozzle 3 and the water intake hole 4 provided on the front end side of the first water.

  The well drilling method and well water pumping method using the well drilling device and the well water pumping device will be described in detail below.

(Assembly process for fixing the tip of the inner tube to the nozzle of the outer tube in the outer tube having a nozzle at the tip and a plurality of water intake holes on the peripheral wall of the tip)

  First, as shown in FIG. 3, the inner tube 2 is inserted into the outer tube 1, and the male screw portion 7 provided at the distal end portion of the inner tube 2 is provided with the nozzle 3 provided at the distal end portion of the outer tube 1. The inner tube 2 is fixed in the outer tube 1 by being screwed into the female screw portion 6 from the inside.

(Excavation process in which a hydraulic pump for excavation is connected to the proximal end of the inner pipe, water is fed into the inner pipe, and the outer pipe advances in the ground while water is ejected from the nozzle of the outer pipe)

  Next, as shown in FIG. 4, the excavating hydraulic pump 11 is connected to the base end side of the inner pipe 2, high-pressure water is fed into the inner pipe 2, and water is ejected vigorously from the nozzle 3 of the outer pipe 1. The outer pipe 1 is advanced in the ground while making the excavation hole H.

  At this time, a part of the water ejected vigorously from the nozzle 3 of the outer pipe 1 becomes sludge water mixed with soil, sand, etc., and passes through the gap between the outer peripheral surface of the outer pipe 1 and the excavation hole H to the ground. Overflowing.

  In addition, when excavating deeply in the ground, a plurality of outer tubes 1 and inner tubes 2 are appropriately connected in the longitudinal direction to perform the excavation.

(After the distal end of the outer tube reaches the water layer, the inner tube is removed from the outer tube, a water absorption pump is connected to the proximal end of the outer tube, and water is pumped up through the outer tube)

  When the distal end side of the outer pipe 1 reaches the groundwater layer W, the water in the groundwater layer W rapidly enters the outer pipe 1 from the intake hole 4 of the outer pipe 1 as shown in FIG. And the water moves vigorously through the space between the outer peripheral wall of the inner pipe 2 and overflows to the ground.

  As a result, anyone can easily understand that the distal end side of the outer pipe 1 has reached the groundwater layer W.

  When the distal end side of the outer tube 1 reaches the groundwater layer W, as shown in FIG. 6, it is provided at the distal end portion of the inner tube 2 from the female screw portion 6 of the nozzle 3 provided at the distal end portion of the outer tube 1. The male thread portion 7 is removed, and the inner tube 2 is extracted from the outer tube 1.

  Then, as shown in FIG. 7, a water absorption pump 10 is connected to the base end side of the outer pipe 1 via an elbow pipe 9, and groundwater is discharged from the nozzle 3 and the water intake hole 4 provided on the distal end side of the outer pipe 1. Suck up water from layer W.

  At this time, the inside of the outer pipe 1 is evacuated by the water absorption pump 10 to suck up the water in the groundwater layer W.

  It should be noted that the present invention is not limited to the above-described embodiment, and all improvements and modifications within the scope that can achieve the object of the present invention are included in the present invention.

  In addition to being used to provide a deep well having a relatively small diameter, the present invention provides, for example, a well for exchanging heat or performing drainage work in tunnel construction of the ground. Can be used widely.

H ... Drilling hole W ... Groundwater layer S ... Water level

DESCRIPTION OF SYMBOLS 1 ... Outer pipe 2 ... Inner pipe 3 ... Nozzle 4 ... Water intake hole 5 ... Taper part 6 ... Female thread part 7 ... Male thread part 8 ... Non-woven net for sand stop 9 ... Elbow pipe 10 ... Water absorption pump 11 ... For excavation Water pressure pump 12 ... Stopper

DESCRIPTION OF SYMBOLS 100 ... Excavation pipe 100a ... Jet nozzle 101 ... Excavation hydraulic pump 102 ... Outer pipe 102a ... Water intake hole 103 ... Water absorption pipe 104 ... Water absorption pump

Claims (7)

An assembly step of fixing the tip of the inner tube so as to be directed to the nozzle of the outer tube in the outer tube having a nozzle at the tip and a plurality of water intake holes on the peripheral wall on the tip side;
A drilling process in which a hydraulic pump for excavation is connected to the base end side of the inner pipe, water is fed into the inner pipe, and the outer pipe advances in the ground while ejecting water from the nozzle of the outer pipe;
After the outer pipe reaches the groundwater layer, the inner pipe is removed from the outer pipe, a water absorption pump is connected to the proximal end of the outer pipe, and water is pumped up through the outer pipe. A method for excavating a well and pumping well water.   The method for pumping wells and pumping well water according to claim 1, wherein the water pumping step sucks water by making the inside of the outer tube into a vacuum state by a water absorption pump.   Consists of an outer tube having a nozzle at the distal end and a plurality of water intake holes on the peripheral wall on the distal end side, and an inner tube that fixes the distal end so as to reach the nozzle of the outer tube. A well excavation / well water pumping device characterized in that a hydraulic pump for excavation can be connected to the part side, and a water absorption pump can be connected to the base end side of the outer pipe from which the inner pipe is removed.   The outer tube nozzle is provided with a female threaded portion on the inner peripheral surface, while a male threaded portion is provided on the outer peripheral surface of the tip portion of the inner tube, and the male threaded portion of the inner tube is screwed onto the female threaded portion of the nozzle of the outer tube. The well excavation / well water pumping device according to claim 3, wherein the inner tube is fixed inside the outer tube.   5. The well drilling / well water pumping device according to claim 3 or 4, wherein the outer pipe is provided with a non-woven net for sand control on a tip end side having a plurality of water intake holes.   6. The well excavation / well water pumping device according to any one of claims 3 to 5, wherein the ratio of the diameter of the outer tube and the inner tube is approximately 2: 1.   7. The well excavation / well water pumping device according to any one of claims 3 to 6, wherein a length of the portion having the water intake hole in the outer pipe is approximately 50 cm to 1 m.

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