JP2011001813A - Slime pumping method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide slime pumping method and device for removing the slime remaining in a diameter enlarged section in an excavated hole without fail and constructing a cast-in-place pile having good quality and sufficient load supporting force.SOLUTION: This slime pumping device is constituted by connecting a slime pumping path 7 and an injection path 7a branched from the slime pumping path 7 with a discharge port 57 for discharging the mixed fluid (a) in the excavated hole 1 sucked through a suction port 56 of a sand pump 4 and providing a flow rate adjusting mechanism 64 in the slime pumping path 7 and the injection path 7a to control flowing-out of the mixed fluid (a) into the slime pumping path 7 and the injection path 7a in accordance with change of depth of the sand pump 4 in the excavated hole 1.

Description

  The present invention relates to a slime pumping method and a pumping device for efficiently removing slime in a borehole excavated in the ground and replacing it with a clean stable liquid in the construction of a cast-in-place concrete pile or an underground continuous wall. About.

  Cast-in-place piles constructed as foundation piles for large structures are excavated in the ground with a predetermined diameter and a depth that reaches the support ground while injecting a stabilizing liquid into the borehole, and after excavation, this drilled pile is excavated. After removing the stabilizing liquid containing slime in the hole with a pumping means and replacing the stabilizing liquid containing slime with a clean stabilizing liquid, insert a reinforcing bar in the hole and cast concrete. It is built by doing.

  Here, the mud pumping means adopts a sand pump (submersible pump) or an air lift system, and slime is drilling waste generated in drilling holes such as sand, silt, gravel, etc. Is a solution (heavy liquid) in which bentonite, water, CMC and the like are mixed. Accordingly, the stabilizing liquid containing slime is a mixture of slime, which is excavated material generated by drilling a hole, in the stabilizing liquid, and is hereinafter referred to as a mixed fluid.

  The above-mentioned stabilizing liquid to be refilled in the drilling hole is used for the purpose of preventing the collapse of the hole wall in civil engineering excavation work in general and for the purpose of conveying excavated earth and sand. It is obliged to stabilize by managing.

  In the construction of cast-in-place piles as described above, slime remains at the bottom of the drilling hole if sufficient replacement cannot be performed during the pumping process in which the mixed fluid in the drilling hole is removed and replaced with a clean stabilizer. Therefore, when concrete is placed on the bottom of the hole where slime accumulates and the pile is constructed, the slime is mixed with the concrete, so that the pile bottom support force cannot be obtained sufficiently. A serious situation will occur that will cause settlement.

  Therefore, in the construction of cast-in-place piles as described above, the slime generated in the drilling hole is removed as much as possible to the one located at the bottom of the drilling hole, and the concrete in the state where the drilling hole is replaced with a clean stable liquid. Therefore, there has already been proposed a slime pumping method that can efficiently remove the slime inside the hole and replace it with a clean stabilizer.

  In the conventional slime muddying method, a sand pump suspended on a ground support member via a wire that is a flexible member is inserted into a drilling hole, and the mixed fluid in the drilling hole is sucked up by this pump to be out of the hole. At the same time, a clean stabilizer is supplied into the drilling hole, and the properties of the collected mixed fluid are measured to determine the amount of slime at the suction position in the drilling hole. By controlling the position of the sand pump in the hole horizontally or vertically, the mixed fluid in the drilling hole is replaced with a clean stable liquid (for example, see Patent Document 1).

Japanese Patent No. 4113504

  By the way, in the construction of cast-in-place piles, in order to increase the load bearing capacity at the pile bottom and the middle part of the pile, the diameter is larger than the outer diameter of the pile defined by the drilling in the middle of the drilling or at the bottom of the pile. In order to construct a high-quality cast-in-place pile with excellent load bearing capacity, of course, slime is also present in the stabilizing liquid in such an enlarged portion. It is necessary to surely remove the slime in the enlarged diameter portion before placing the concrete.

  However, as in the conventional method, in the muddying method in which the mixed fluid is sucked up by the sand pump suspended in the drilling hole by using a wire, the sand pump is positioned in the enlarged diameter portion having a larger diameter than the drilling hole. Therefore, even if the mixed fluid in the drilling hole can be sucked up, the inside of the enlarged diameter part cannot be sucked directly. If slime remains in the enlarged diameter part, and slime remains in the enlarged diameter part after slime processing of the drilling hole, as described above, in the construction of cast-in-place pile, the effect of the enlarged diameter part is obtained. There arises a problem that it cannot be fully utilized.

  Accordingly, the object of the present invention is to solve the above-mentioned problems, and it is possible to surely remove the slime in the enlarged diameter portion provided in the drilling hole, and a high-quality cast-in-place pile excellent in load bearing capacity. It is to provide a slime pumping method and a mud pumping device that can be constructed.

  In order to solve the above-mentioned problems, the invention of the method is a slime pumping method in which slime in a drilling hole is mixed with a stable liquid and fluid transported. Part or all of them are re-injected into the drilling hole from the injection port provided after the suction port of the mud pumping means, thereby forcibly generating convection with respect to the mixed fluid in the drilling hole. The mixed fluid is disturbed by a single pumping means and pumped up.

  The flow rate ratio between the amount of pumped mud of the mixed fluid of the pumping means and the amount injected into the drilling hole can be changed according to the distance between the pumping means and the bottom of the drilling hole.

  Measure the concentration or density value of the mixed fluid pumped by the above-mentioned mud pumping means or the mixed fluid in the borehole around the pumping means, and confirm the properties of the mixed fluid in the borehole based on this measured value Then, the flow rate ratio of the amount of mud of the mixed fluid of the mud lifting means and the amount of injection into the drilling hole may be controlled.

  It is also possible to change the fluid ejection direction of the ejection nozzle that ejects the mixed fluid into the drilling hole according to the distance between the pumping means and the drilled hole bottom.

  Next, according to the invention of the apparatus, the transport path of the mud means for sucking the mixed fluid of the slime and the stabilizing liquid in the drilling hole, the injection path for ejecting the mud mixed fluid to the periphery of the mud means, and the mud to the ground And a flow rate adjusting mechanism for changing the flow rate ratio of the mixed fluid flowing in the injection path and the muddy path.

  It can be set as the structure where the said flow volume adjustment mechanism changes the flow rate ratio according to the distance of a pumping means and a drill hole bottom.

  The flow rate adjusting mechanism is formed by measuring means for measuring the concentration or density value of the mixed fluid conveyed by the mud lifting means, or measuring means for measuring the concentration or density value of the mixed fluid in the borehole around the lifting mud means. You may be made to do.

  A structure having an angle control mechanism that makes the fluid ejection direction of the ejection nozzle provided in the ejection path variable, and changes the fluid ejection direction of the ejection nozzle according to the distance between the pumping means and the bottom of the drill hole. It can be.

  Here, the pumping means uses a sand pump, is suspended by a flexible member such as a wire, and is inserted into the drilling hole, thereby sucking the mixed fluid in the drilling hole from the lower suction port of the pump chamber. , And sent out from a discharge port provided at one place in the vicinity to a transport path connected thereto.

  Further, the injection path includes a plurality of injection nozzles arranged so as to surround the pumping means at an upper position of the pumping means, and a branch pipe that connects the plurality of injection nozzles in the middle of the pumping path. The injection nozzle is fixedly arranged or the angle of the injection direction is variable.

  The flow rate adjusting mechanism is formed by a first flow rate control valve provided at a position downstream of the branch pipe in the middle of the mud pumping path and a second flow rate control valve provided in the middle of the branch pipe. By controlling the opening of the valve, it is possible to control the flow rate of the mixed fluid sucked up by the muddying means to the muddy path and the injection path, and to block either the muddy path or the injection path. .

  The landing detection means used as a means for detecting the distance between the above-mentioned muddying means and the bottom of the hole mechanically detects that the muddying means has landed on the bottom of the drilling hole or suspends the muddy means. Adopting a mechanism that detects the occurrence of slack in the flexible member, mechanically or electrically interlocking the landing detection means and the flow rate adjusting mechanism, when the lifting means descends to the bottom of the drilling hole, The landing detection means that detects the flow actuates the flow rate adjusting mechanism and controls the opening degree of the first flow rate control valve and the second flow rate control valve. For example, part or all of the mixed fluid sucked by the mud lifting means Is caused to flow from the injection nozzle into the hole.

  The drilling hole is provided with an enlarged diameter portion at the bottom thereof, and when the mixed fluid is injected from the injection nozzle into the enlarged diameter portion in a state where the mud lifting means is landed on the bottom of the drilling hole, the enlarged diameter is obtained. In the part, forced convection is generated in the mixed fluid from the enlarged diameter part toward the suction port of the mud lifting means, whereby the slime in the enlarged diameter part flows and is disturbed and captured. .

  When the nozzle is fixedly arranged, the nozzle at the tip sprays the fluid mixture with the posture facing outward with respect to the sand pump, and when the angle is variable, the nozzle is normally inclined downward. The landing detection means lands on the bottom of the drilling hole, and the lifting means further descends, so that the angle changes horizontally, and the mixed fluid is injected tangentially outward with respect to the sand pump. In any case, when the pumping means reaches the bottom of the drill hole, the mixed fluid can be sprayed toward the inner periphery of the enlarged diameter portion of the drill hole, and the slime in the enlarged diameter portion can be efficiently disturbed. .

  After disturbing the slime in the enlarged-diameter portion in a state where the muddying means has landed on the bottom of the drilling hole, the flow adjusting mechanism is operated by raising the muddy means with respect to the landing detecting means, and the first flow adjusting mechanism is activated. If the opening degree of the flow rate control valve and the second flow rate control valve is changed to discharge the mixed fluid to the ground, the slime in the enlarged diameter portion can be efficiently captured and removed by suction.

  As a means for measuring the concentration or density value of the mixed fluid, a property measuring means such as a Coriolis mass flow meter can be used.

  According to the present invention, in the slime pumping method in which the slime in the drilling hole is mixed with a stabilizing liquid and transported by fluid, both the function of pumping mud and disturbance are realized by switching the fluid transport path in one pumping mud means. As a result, the apparatus can be reduced in size and cost.

  In addition, by injecting part or all of the mixed fluid sucked by the pumping means from the nozzles provided after the suction port of the pumping means into the drilling hole again, the pumped mixed fluid is jetted. Forcibly generate convection with respect to the mixed fluid in the hole, and improve the suction efficiency by disturbing the slime, efficiently removing the slime in the hole and replacing it with a clean stable liquid. Thus, a high-quality cast-in-place pile with excellent load bearing capacity can be constructed.

  Furthermore, the flow rate ratio between the pumping path and the injection path is changed according to the distance between the pumping means and the bottom of the drilling hole, so that slime is efficiently disturbed at the enlarged diameter part provided in the drilling hole. Thus, suction and capture can be performed, and slime in the enlarged diameter portion can be reliably removed.

  In addition, by confirming the properties of the pumped mixed fluid and changing the flow rate ratio between the pumping path and the injection path, the situation of slime distribution in the drilling hole can be grasped in real time, and a high concentration can be obtained. If it is possible to avoid dangerous work such as overloading of the pumping mud and sand clogging in the pumping mud route, and controlling the position of the pumping mud according to the situation of the slime distribution, The accuracy and efficiency of removal can be greatly improved.

  Moreover, excavation of the hole bottom ground by the injection mixed fluid can be avoided by changing the injection direction of the injection nozzle according to the hole bottom distance.

Longitudinal front view showing the state when slime is pumped by the automatic slime pump Top view showing the state when slime is pumped by the automatic slime pump Front view showing the state of the slime automatic mud device during storage Front view showing the state of the automatic slime pump Explanatory drawing showing the relationship between the undulation movement of the pump moving arm and the horizontal movement of the sand pump in the suspended state of the sand pump by the wire (A) is a longitudinal front view showing a state at the time of landing detection in the landing detection means of the third example of the sand pump, (b) is a vertical front view when the moving pulley is in the lowered position by wire feeding. (A) is an enlarged vertical front view when the sand pump is suspended in the landing detection means of the third example of the sand pump, and (b) is an enlarged vertical front view when the sand pump is landing. Explanatory drawing showing the relationship between the sand pump and the wire that suspends it in the slime automatic mud pump Longitudinal sectional view showing the mechanism for exchanging the sand pump and showing the state before the cable reel of the cable connected to the sand pump is attached to the pump moving arm of the slime automatic mud lifting device Longitudinal sectional view showing the mechanism for exchanging the sand pump and showing the cable reel of the cable connected to the sand pump attached to the pump moving arm of the slime automatic mud pump (A) is a front view showing a state in which a sand pump and a cable reel are set on a stand, and (b) is a longitudinal side view of the same. Front view showing a sand pump suspended from a wire and a landing detection means of a second example attached to the sand pump Side view showing a sand pump suspended from a wire and a landing detection means of a second example attached to the sand pump Front view showing a sand pump suspended from a wire and a third example of landing detection means attached to the sand pump Side view showing a sand pump suspended on a wire and a third example landing detection means attached to the sand pump Explanatory drawing which shows the relationship between the enlarged diameter part of a drilling hole, and the sand pump which removes the slime in this enlarged diameter part (A) is a front view of the state before landing showing the relationship between the variable angle injection nozzle provided on the outer periphery of the sand pump, the angle adjusting mechanism, and the landing detection means, and (b) is the same state when landing. Front view An enlarged cross-sectional plan view showing the relationship between the variable-angle nozzle nozzle provided on the outer periphery of the sand pump, the angle adjustment mechanism, and the landing detection means Front view showing the state before landing, in which the angle variable injection nozzle provided on the outer periphery of the sand pump and the angle adjustment mechanism are enlarged. Front view showing the state at the time of landing in which the angle variable injection nozzle provided on the outer periphery of the sand pump and the angle adjustment mechanism are enlarged.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the construction of cast-in-place concrete piles, the slime in the drilling hole and the enlarged diameter portion provided in the drilling hole is surely made efficient in the muddying process where the slime in the drilling hole is removed and replaced with a stable liquid. It is a slime muddying method and device that can be removed well and can build a highly safe cast-in-place concrete pile with excellent load bearing capacity.

  1 to 8 show a drilling hole 1 excavated in the ground for construction of cast-in-place concrete piles, etc., and a slime automatic mud lifting device A that removes slime in this drilling hole 1 and replaces it with a clean stable liquid. The drilling hole 1 has a predetermined hole diameter and a depth at which the hole bottom reaches the support ground, the inner periphery of the upper end is protected by the stand pipe 2, and a load supporting force is provided at the hole bottom part and the intermediate part as necessary. In order to increase the diameter, an enlarged diameter portion 3 (see FIG. 16) excavated larger than the outer diameter of the pile defined by the drilling hole 1 is provided.

  The above slime automatic mud lifting device A suspends a single mud lifting means (hereinafter referred to as a sand pump) 4 by a flexible member (hereinafter referred to as a wire) 5 and inserts it into the hole 1. The mixed fluid (stable liquid containing slime) a in the drilling hole 1 is taken out to the ground by moving up and down by winding, and further horizontally moving by planar turning and forward and backward movement. In addition to the suspension wire 5, a power supply cable (capty) 6, a pumping mud path 7 as a transport path for guiding the mixed fluid a sucked into the discharge port to the ground, and a hose 8 connected thereto are connected. Has been.

  This slime automatic mud lifting device A is a flat base frame 9 installed in a horizontal state on the ground outside the upper end portion of the stand pipe 2, and is flat on the upper surface of the base frame 9 around the axis of the swivel wheel 10. The revolving frame 11 provided so as to be able to revolve and the support frame 12 fixed to the upper surface of the revolving frame 11 are attached to the front portion of the revolving frame 11 and can be raised and lowered while standing upright. A pair of pump moving arms 13, a hose drum 15 rotatably attached to the rear position at the upper end of the support base 12 and driven by a hydraulic motor 14, and both sides of the rear end portion on the upper surface of the swivel frame 11. And a movable table 17 that can be inserted into and removed from the front portion of the base frame 9.

  The pump moving arm 13 includes a large-diameter pipe 13a having a rear end attached to the upper surface of the support base 12 by a pivot 18 and a small-diameter pipe 13b that can be taken in and out from the tip of the large-diameter pipe 13a. The pump 19 can be expanded and contracted by a cylinder 19 provided between the pipes 13b. The pump moving arms 13 are arranged opposite to each other on both sides of the upper part of the swivel frame 11, and the cable 6 is wound between the tips of both small diameter pipes 13b. A cable reel 20 for taking and feeding is rotatably supported, and a hydraulic motor 21 for driving the cable reel 20 is attached to both small-diameter pipes 13b.

  Brackets 22 having both ends extending in a letter C shape are fixed to the outer surfaces of both small-diameter pipes 13b behind the cable reel 20, and guide pulleys 23 and 24 of the wire 5 are attached to both ends of each bracket 22 to face each other. A guide roller 25 for guiding the cable 6 of the sand pump 4 to the cable reel 20 is rotatably provided between one bracket 22 and the other end of the pump moving arm 13 when the pump moving arm 13 is lying down. A winch 26 that winds and unwinds the wire 5 is fixed to a back position that is on the upper side when the pump moving arm 13 is overturned. Further, a horizontal overturn is provided between the opposing surfaces of both the small-diameter pipes 13b. Sometimes a hose guide 27 for guiding the hose 8 of the sand pump 4 to the hose drum 15 is rotatably mounted at a position below the bracket 22 on the lower side. It is.

  The pump moving arm 13 is substantially upright with a truck transporting posture (FIG. 4) that lies down substantially horizontally by expansion and contraction of a hoisting cylinder 28 provided so as to connect the support base 12 and the tip of the large-diameter pipe 13a. It moves up and down at a variable angle between the standing storage position (FIG. 3).

  Further, as shown in the plan view of FIG. 2, the winch 26 has a structure in which a pair of drums 26a positioned immediately above the small-diameter pipes 13b on both sides are driven by a motor 26b. By simultaneously winding or unwinding, the sand pump 4 is moved up and down. A hydraulic unit 29 for driving each cylinder and hydraulic motor is installed on the revolving frame 11.

  Here, the slime pumping operation in the drilling hole 1 by the sand pump 4 is performed while the sand pump 4 is continuously or intermittently transferred from the upper part of the drilling hole 1 to the lower part to the lower side. However, as shown in FIG. 1, it is necessary to move the sand pump 4 horizontally at each height position in the drilling hole 1 in order to remove slime located at the same height level.

  Since the sand pump 4 is suspended by the wire 5 hanging from the guide pulley 23 provided at the tip of the pump moving arm 13, the sand pump 4 can be moved up and down by winding or unwinding the wire 5 by the winch 26.

  Moreover, the horizontal movement of the sand pump 4 uses a method in which the pump moving arm 13 is swung together with the swivel frame 11 and a method in which the pump moving arm 13 is moved up and down and moved in the front-rear direction, either alone or in combination. Will do.

  For example, when the sand pump 4 is horizontally moved in the front-rear direction of the slime automatic mud lifting device A by moving the pump moving arm 13 up and down, the wire 5 is used to sandwich the sand from the tip of the pump moving arm 13 that is generally used. In the structure in which the pump 4 is suspended, the sand pump 4 moves up and down at the same time as the pump moving arm 13 undulates. It is necessary to absorb the change in the height of the sand pump 4 by feeding, and in order to automatically wind or unwind such a wire 5, a separate winch control mechanism is required, and automatic slime mud There is a problem that the equipment cost of the apparatus A is increased.

  Therefore, in the present invention, the wire pump 5 is suspended from the pump moving arm 13 so that the sand pump 4 moves approximately horizontally even when the pump moving arm 13 is raised and lowered. The adoption of the control mechanism is omitted, and the equipment cost is reduced.

  FIGS. 1 to 4 show a specific structure of the wire 5 routing process, and an outlet pulley 30 and an entry pulley 31 are attached to the upper ends of both the columns 16 described above, and they move up and down along the columns 16. A weight 33 that is lighter than the weight of the sand pump 4 is attached to the lower portion of the movable pulley 32, and the landing detection means of the first example is formed by detecting the lowered position of the weight 33 with a sensor or the like. be able to.

  The wire 5 for suspending the sand pump 4 is used in a state in which a long one is folded in half, and the sand pump is connected to the folded portion which is the middle of the wire 5 via the equalizers 74 and 74 on both sides of the equalizer member 34 as shown in FIG. 4 is suspended, the parallel parts on both sides of the wire 5 are symmetric, the part rising from the equalizer member 34 is guided by both guide pulleys 23 and 24 of the bracket 22, and the exit side provided on the column 16 from the guide pulley 24 To the pulley 26 of the winch 26 by folding back at the moving pulley 32 and guiding it from the entry pulley 31 to the drum 26a of the winch 26. Both ends of the wire 5 are wound around the drums 26a. The sand pump 4 is moved up and down by winding or unwinding the wire 5.

  As shown in FIG. 7, a shaft-like stopper 35 that restricts the upper limit of the movable pulley 32 is provided in the middle of the both struts 16 so as to be movable up and down. In addition, a landing detector 37 is fixed to the upper end portion of the support 16, and a landing detection sensor 38 that detects the presence or absence of the landing detector 37 and a lower limit of the movable pulley 32 are set on the support column 16. The lower limit sensor 39 for detecting by is attached.

  When the sand pump 4 is suspended by the wire 5 at the tip of the pump moving arm 13, the weight of the sand pump 4 and the weight 33 are used in the state where the winch 26 is fixed so that the wire is not fed out from the drum 26 a. As shown in FIG. 7A, the wire 5 is tensioned, the moving pulley 32 is pulled up to the raised position, the upper end surface comes into contact with the stopper 35, the spring 36 is compressed by the weight of the sand pump 4, and the stopper 35 is Stopping at the phase pushed up to the raised position, and the landing detector 37 moving away from the landing detection sensor 38, the landing detection sensor 38 detects that the sand pump 4 is not landing, In this state, even if the suspended sand pump 4 is moved up and down by the activation of the winch, the sand pump is further driven by turning or undulating movement of the pump moving arm 13. Also in horizontal movement, no change in the relationship between the movable pulley 32 and the stopper 35 since the weight of the sand pump 4 is acting, Agedoro process will be carried out in such a state for drilling 1.

  FIG. 5 shows the relationship between the undulation movement of the pump moving arm 13 and the horizontal movement of the sand pump 4 in the suspended state of the sand pump 4 by the wire 5 as described above, and the pump moving arm 13 is inclined forward. Thus, as shown by the solid line in the figure, when the pump moving arm 13 is tilted forward, the length of the wire 5 between the sand pump 4 and the drum 26a is the length A1 between the sand pump 4 and the guide pulley 23, The length A2 between the guide pulleys 23 and 24, the length A3 between the guide pulley 24 and the exit pulley 30, the length A4 between the exit pulley 30 and the moving pulley 32, and between the moving pulley 32 and the entry pulley 31 This is the sum of the length A5 and the length A6 between the entry pulley 31 and the drum 26a.

  Further, as shown by a two-dot chain line in FIG. 5, when the pump moving arm 13 is standing, the length of the wire 5 between the sand pump 4 and the drum 26 a is the length between the sand pump 4 and the guide pulley 23. B1, a length B2 between the guide pulleys 23 and 24, a length B3 between the guide pulley 24 and the exit pulley 30, a length B4 between the exit pulley 30 and the moving pulley 32, a moving pulley 32 and the entry pulley 31 It is the total of the length B5 between and the length B6 between the entrance pulley 31 and the drum 26a.

  The total of the lengths A1 to A6 and the total lengths B1 to B6 described above is substantially equal even when the undulation angle of the pump moving arm 13 changes when the drum 26a is stopped. When 13 rises from the solid line in FIG. 5 as shown by a two-dot chain line, the height of the guide pulleys 23 and 24 rises and the sand pump 4 is pulled up. At this time, the pump moving arm 13 is raised and lowered. Since the pivot 18 serving as a fulcrum is located in front of the exit pulley 30 and the entry pulley 31, the distance between the guide pulley 24 and the exit pulley 30 and the distance between the drum 26a and the entry pulley 31 approach each other. As a result, the wire 5 is drawn from the guide pulley 23 to the sand pump 4 side by the approached length, and the length B1 becomes longer than the length A1, thereby eliminating the lifting of the sand pump. , Even derricking angle is changed in the pump moving arm 13, sand pump 4 will be approximately horizontal movement along a longitudinal direction of undulation of the pump moving arm 13.

  Thus, when the slime in the hole 1 is pumped by the sand pump 4 suspended by the wire 5, the sand pump 4 is moved approximately horizontally in the front-rear direction only by moving the pump moving arm 13 up and down. Therefore, the slime can be efficiently removed with a simple mechanism at the same plane position in the drilling hole 1.

  6B, the drum 26a of the winch 26 is rotated to feed out the wire 5, and when the lowered sand pump 4 is landed on the bottom of the hole 1 or as shown in FIG. When the sand pump 4 is placed on the table 17, the weight of the sand pump 4 does not act on the wire 5, so that the wire 5 is loosened, so that the movable pulley 32 is moved down by the weight 33 and the stopper 35 is pushed up. In order to solve this problem, the stopper 35 and the landing detector 37 attached to the stopper 35 are lowered by the pushing force of the spring 36, and the landing detection sensor 38 detects the landing detector 37 to confirm the landing of the sand pump 4. Then, the drum 26a of the winch 26 is stopped to stop the feeding of the wire 5.

  Further, when the moving pulley 32 moves downward and the lower limit sensor 39 detects the lower end of the weight 33, the lower limit sensor 39 stops the drum 26 a of the winch 26 to stop the feeding of the wire 5, and the weight 5 is attached to the wire 5. The slack is prevented by applying a tension with the weight of, and the occurrence of turbulent winding during winding of the wire 5 by the drum 26a of the winch 26 is prevented.

  When the above-described slime automatic mud lifting apparatus A is transported by truck, first, as shown in FIG. 3, the pump moving arm 13 is erected in an upright state, the sand pump 4 is lifted to the raised position, and is moved to the front portion of the base frame 9. The table 17 is pulled out, the wire 5 is drawn out from the drum 26a of the winch 26 and placed on the movable table 17 while the sand pump 4 is lowered. The lower limit sensor 39 detects the weight 33 and the drum 26a is automatically operated. It is extended until it stops (the state shown in FIG. 6 (b)). In this state, if the pump moving arm 13 is brought down to the horizontal state as shown in FIG. The height can be made compact.

  At this time, the hose 8 and the cable 6 connected to the sand pump 4 are automatically pulled out by tension because the hose drum 15 and the cable reel 20 are controlled by the hydraulic motor.

  Further, it is necessary to select a sand pump 4 having a discharge capacity adapted to the diameter of the drilling hole 1 and the like. For this reason, the sand pump 4 can be easily replaced with the slime automatic mud lifting device A. It is preferable to do so.

  The sand pump 4 is provided with a hose 8, a cable 6 and a wire 5. However, since the cable 6 cannot secure insulation by taping or the like like an air cable, the sand pump 4 can be replaced. In order to do so, it is necessary to devise the cable 6 connection process.

  FIGS. 9 to 11 show a mechanism for exchanging the sand pump 4. The sand pump 4 and the cable reel 20 around which the cable 6 connected to the sand pump 4 is wound are set as one set. A horizontal cylinder shaft 41 is rotatably supported by a bearing 40 fixed to the distal end portion of the small-diameter pipe 13b, and this cylinder shaft 41 is driven by a hydraulic motor 21 fixed to the small-diameter pipe 13b. One end of the cable 6a housed in the cable and the cap tire 6b connected to the power source are electrically connected by a slip ring in a box 42 provided so as not to rotate to one end side of the cylindrical shaft 41, and the other end side of the cylindrical shaft 41 Are provided with a circular plate 43 that rotates integrally with the cylindrical shaft 41 and a cylindrical reel mounting shaft 44 that protrudes from the cylindrical shaft 41, and the other end of the cable 6a is connected to the reel mounting shaft 44. Connecting outlet 45 and electrically to provided inside the tip.

  The cable reel 20 is provided with flanges 47 at both ends of a cylindrical shaft 46 fitted around the reel mounting shaft 44, and a pair of coupling portions 48 for transmitting rotation between the flange 47 and the disc 43, A cable 6 is wound around the outer periphery of a winding drum 49 provided between the flanges 47, and the inner end side of the cable 6 is pulled out from the inner side of the winding drum 49 to the outside of the other flange 47 and plugged into the outlet 45 at the end thereof. 50 is provided.

  FIG. 9 shows a state before the sand pump 4 is attached to the slime automatic mud lifting apparatus A, and FIG. 10 shows a use state in which the sand pump 4 is attached to the slime automatic mud lifting apparatus A. 46 is fitted and inserted, the cable reel 20 is attached, the coupling portion 48 is engaged, the bolt 51 is tightened, and the outlet 45 and the plug 50 are connected, so that the cable reel 20 can be attached to and detached from the tip of the small-diameter tube 13b. The cable reel 20 can be driven by a hydraulic motor 21.

  In this way, the sand pump 4 can be easily replaced by simply attaching and detaching the cable reel 20 to and from the reel mounting shaft 44, and inserting and removing the outlet 45 and the plug 50. The pump 4 and the cable reel 20 to be replaced are shown in FIG. As described above, if it is supported by the dedicated stand 52, the replacement work can be performed efficiently.

  FIGS. 12 to 16 show the structure of an example in which the sand pump 4 which is the mud lifting means of the present invention and a fixed injection nozzle are attached thereto, and a casing 55 in which an impeller 54 is incorporated in an internal pump chamber 53. In addition, a suction port 56 located at the center of the lower portion and an upward discharge port 57 located at a part of the outer periphery are provided, and a motor 58 for driving the impeller 54 is located at the upper portion of the casing 55. And a hose 8 connected to the upper end of the discharge pipe 60 and the discharge pipe 60 and the hose 8 to send the mixed fluid a to the ground. Route 7 is obtained.

  12 to 16, an annular pipe 61 surrounding the outside of the sand pump 4 is disposed at the upper position of the sand pump 4 in order to eject the mixed fluid a toward the outside of the sand pump 4. The pipe 61 is connected to the middle of the discharge pipe 60 serving as the mud pumping path 7 by a branch pipe 62, and the annular pipe 61 and the branch pipe 62 serve as an ejection path 7a in the transport path.

  This annular pipe 61 uses a pipe having a circular cross section, is formed in a circular ring shape that is fitted on the outside of the upper portion of the sand pump 4, and a plurality of injection nozzles 63 are provided on the outer peripheral portion at predetermined intervals in the circumferential direction. The mixed fluid a pumped up by the sand pump 4 is ejected to the outside of the sand pump 4 from a front end jet port which is obliquely downward of the jet nozzle 63.

  A flow rate adjusting mechanism 64 that controls the discharge of the mixed fluid a sucked by the sand pump 4 to the discharge pipe 60 of the pumping mud path 7 and the branch pipe 62 of the jetting path 7a with respect to the mud pump path 7 or the injection path 7a. The flow rate adjusting mechanism 64 is mechanically or electrically controlled by the landing detection means 65 that detects that the sand pump 4 has reached the bottom of the drilling hole 1. The flow rate control of the sucked mixed fluid a to the mud path 7 and the injection path 7a and the blocking of either the mud path 7 or the injection path 7a can be performed.

  The flow rate adjusting mechanism 64 includes a first flow rate control valve 66 provided at a position downstream of the branch pipe 62 in the middle of the discharge pipe 60 and a second flow rate control valve 67 provided in the middle of the branch pipe 62. As shown in FIGS. 12 and 13, the valve shafts 68 of both flow control valves 66 and 67 are coupled to each other, and when one of the flow control valves 66 or 67 is in the valve opening phase, the other flow control valve When the valve shaft 68 is rotated in conjunction with the valve closing phase 66 or 67, the outflow of the mixed fluid a sucked by the sand pump 4 is increased in one of the muddy path 7 and the injection path 7a. The flow is reduced, or one or the other of the mud path 7 and the injection path 7a is blocked.

  FIGS. 12 and 13 show the landing detection means 65 of the second example, and the landing member is attached to the lower end of the lifting rod 70 held so as to be movable up and down by a rod guide 69 provided outside the sand pump 4. The flooring member 71 is in a descending phase, usually lower than the lower end of the strainer 59, and the lower end of the lowered sand pump 4 is at the bottom of the drilling hole 1. Before landing, it reaches the bottom of the hole 1 and stops, and moves relative to the descending sand pump 4.

  The upper end of the link 72 pivotally connected to the upper end of the lifting rod 70 is pivotally connected to the tip of the lever 73 fixed to the valve shaft 68 of the first and second flow control valves 66 and 67 in the flow rate adjusting mechanism 64. The first flow rate control valve 66 and the second flow rate control valve 67 are simultaneously controlled by the relative rise of the lifting rod 70 with respect to the sand pump 4.

  12 and 13 show a state when the sand pump 4 is not landed on the bottom of the drilling hole 1, and the lifting rod 70 is in the lowered position with respect to the sand pump 4, and the first and second Since the lever 73 of the flow control valves 66 and 67 is pulled down, the second flow control valve 67 of the branch pipe 62 is in the valve closing phase, and the first flow control valve 66 of the discharge pipe 60 is in the valve opening phase. ing. For this reason, the mixed fluid a sucked by the sand pump 4 does not reach the injection nozzle 63 and flows out from the mud path 7 to the ground.

  FIG. 16 shows a state in which the sand pump 4 has landed on the bottom of the hole. The elevating rod 70 is in a raised position with respect to the sand pump 4 and the levers 73 of the first and second flow control valves 66 and 67 are moved to 90. Therefore, the second flow control valve 67 of the branch pipe 62 connected to the annular pipe 61 is in the valve opening phase, and the first flow control valve 66 of the discharge pipe 60 is in the valve closing phase. For this reason, the mixed fluid a sucked by the sand pump 4 stops flowing out to the mud pumping path 7 and flows from the branch pipe 62 to the annular pipe 61, and from the outlet nozzle 63 of the annular pipe 61 to the outside of the sand pump 4. Will erupt towards.

  The opening degree of the first and second flow control valves 66 and 67 gradually increases from the time when the lower end of the lifting rod 70 comes into contact with the bottom of the hole until the lowered sand pump 4 reaches the floor. It is controlled so that the outflow to the mud path 7 gradually decreases and the flow to the injection path 7a gradually increases.

  FIGS. 14 and 15 show the third landing detection means 65a, and the first and second flow control valves 66, 67 are generated by using the slack generated when the wire 5 that suspends the sand pump 4 is landed. The opening is controlled at the same time. In order to suspend the sand pump 4 from the folded portion of the wire 5, the equalizer member 34 attached to the top of the sand pump 4 winds the wire 5 on both sides thereof. Equalizers 74 and 74 are provided.

  The third landing detection means 65a is located at a position below the equalizer member 34 in the upper part of the sand pump 4, and at one end of the swing arm 75 that is pivotable up and down with one end pivoted to the sand pump 4. A pulley 76 is provided on the wire 5, and a portion of the equalizer member 34 located between the equalizers 74, 74 is wound around the pulley 76 at the folded-back portion of the wire 5, and the tip of the swing arm 75 and the first and second flow control. The front end of the lever 73 fixed to the valve shaft 68 of the valves 66 and 67 is coupled by a connecting member 77, and a spring 78 is provided between the front end of the lever 73 and the sand pump 4 to constantly pull down the lever 73. ing.

  When the sand pump 4 is suspended by the wire 5 during normal lifting, the wire 5 on which the weight of the sand pump 4 is applied is strained. Therefore, the wire 5 is a portion located between the equalizers 74 and 74 of the equalizer member 34. Pulls up the pulley 76 of the swing arm 75, the swing arm 75 pulls up the lever 73 against the elasticity of the spring 78 via the connecting member 77, and the flow rate adjusting mechanism 64 pulls up the lever 73. Since the second flow rate control valve 67 of the branch pipe 62 is in the valve closing phase and the first flow rate control valve 66 of the discharge pipe 60 is in the valve opening phase, the mixed fluid a sucked by the sand pump 4 is Will not flow into the injection path 7a and will flow out of the mud path 7 to the ground.

  When the sand pump 4 is landed on the bottom of the drilling hole 1, the wire 5 is loosened at the portion located between the equalizers 74, 74 of the equalizer member 34, so that the swing arm 75 lifts the connecting member 77. And the lever 73 is pulled down by the spring 78, whereby the flow rate adjusting mechanism 64 is switched, and the second flow rate control valve 67 of the branch pipe 62 enters the valve opening phase. Since the flow control valve 66 of No. 1 is in a closed phase, the mixed fluid a sucked by the sand pump 4 does not flow out to the mud pumping path 7 but flows into the injection path 7a and flows from the injection nozzle 63 to the sand pump 4. Will spout toward the outside of the.

  Moreover, as the fourth landing detection means, the landing detector 37 and the sensor 38 shown in FIGS. 6 and 7 can be used, and the sand pump 4 is landed on the hole bottom of the drilling hole to wire 5. By detecting that the sand pump 4 is loosened, it is possible to know on the ground that the sand pump 4 has landed.

  When a structure using a sensor is employed, such as the first landing detection means and the fourth landing detection means described above, the first flow control valve 66 and the second flow control of the flow adjustment mechanism 64 are used. The valve 67 controls the opening degree by power means such as a motor or a cylinder, and operates the power means wired or wirelessly by a landing signal obtained by detecting the looseness of the wire by the sensor, and the first and second flow rates. The opening degree of the control valves 66 and 67 may be controlled in synchronization.

  In order to deal with drilling without an enlarged diameter portion, the mechanical landing detection means directly connected to the flow rate adjusting mechanism 64 can be disconnected from the flow rate adjusting mechanism 64, or the power means can be wired or wireless. If the landing detecting means that is operated in step S3 is not operated, the mixed fluid a is not injected from the injection nozzle 63 of the annular pipe 61 even if the sand pump 4 is attached to the bottom of the hole. Can be.

On the other hand, the mechanical landing detection means directly connected to the flow rate adjusting mechanism 64 is forcibly pulled up from the ground with a wire or the like, or the landing detection means for operating the power means by wire or wirelessly. If the power means is operated, the mixed fluid a can be jetted from the jet nozzle 63 while the sand pump 4 is at an appropriate depth of the bore 1. The discharge mode and the injection mode can be freely selected according to conditions such as the presence or absence of 3.

  17 to 20, the angle of the fluid injection direction of the injection nozzle 63 provided on the outer periphery of the sand pump 4 is variable, and the mixing of the injection nozzle 63 is performed by the angle control mechanism 91 interlocked with the landing detection means 65. The example which changed the injection direction of the fluid a automatically according to the distance of the sand pump 4 and a hole bottom is shown.

  In order to mount the injection nozzle 63, it is supported on the outer periphery of the sand pump 4 by an annular fixing ring 92 fixed to the sand pump 4 and a plurality of guide rollers 93 provided on the fixing ring 92. In addition, a movable ring 94 that is rotatable directly above the fixed ring 92 is provided, and a large number of injection nozzles 63 can be rotated around the pivot shaft 95 at regular intervals on the outer peripheral surface of the fixed ring 92. It is installed to become.

  The jet nozzle 63 is arranged in a tangential direction with respect to the outer periphery of the sand pump 4 as shown in FIGS. 17A and 19 in a horizontal posture, and is a lever 96 fixed to the pivot 95. When the movable ring 94 rotates toward the left side of FIG. 19, the jet nozzle 63 faces obliquely downward, and the movable ring 94 moves to the right side of FIG. When the nozzle is rotated toward the nozzle, the injection nozzle 63 is rotated so as to be horizontal upward.

  The angle control mechanism 91 arranges a long plate cam 98 on the outside of the fixed ring 92 and the movable ring 94 by fixing it in the middle of the lifting rod 70 in the landing detection means 65 shown in FIG. The plate cam 98 is provided with a long cam groove 99 whose upper end is inclined upward to the right in FIG. 19 with respect to the vertical line, and is located at the upper position of the movable ring 94 with respect to the upward plate 100 provided from the fixed ring 92. A swing lever 102 attached by a pivot 101 is disposed, and a groove wheel 103 attached to one end of the swing lever 102 is fitted into the cam groove 99, and the other end of the swing lever 102 and the movable ring 94 are linked to a link 104. It has a structure that is pivotally connected via

  When the lifting rod 70 of the landing detection means 65 does not reach the hole bottom with respect to the sand pump 4, the lifting rod 70 and the plate cam 98 are at the lower limit position as shown in FIGS. The groove wheel 103 of the swing lever 102 is pulled down at the upper end of the cam groove 99, and the movable ring 94 is pulled to the left side of FIG. 19 by the swing lever 102, and each injection nozzle 63 has a link 97 and a lever 96. It is inclined diagonally downward by the action of.

  When the sand pump 4 is landed on the bottom of the hole, the lifting rod 70 and the plate cam 98 of the landing detecting means 65 are in contact with the sand pump 4 as shown in FIGS. When the plate cam 98 rises, the inclined cam groove 99 pushes up the groove wheel 103 of the swing lever 102, and the swing lever 102 rotates counterclockwise in FIG. When the movable ring 94 is pushed to the right side in FIG. 19 via the link 104 and the movable ring 94 moves to the right side, each nozzle nozzle 63 changes to a horizontal posture by the action of the link 97 and the lever 96.

  Although not shown in the drawings, the above-described branch pipe 62 is connected to each of the injection nozzles 63 via a flexible hose, and the mixed fluid a supplied by opening the second flow control valve 67 is injected. Each of the injection nozzles 63 becomes horizontal when the sand pump 4 reaches the bottom of the hole, and sprays the mixed fluid a toward the outside in the tangential direction of the sand pump 4. The mixed fluid a is accurately jetted toward the enlarged diameter portion 3 to generate convection, and the slime in the enlarged diameter portion 3 can be reliably disturbed, and the hole bottom of the drilled hole 1 can be injected with the jet flow of the mixed fluid a. There is an advantage that it is not damaged.

  As described above, in the example shown in FIGS. 17 to 20, in the injection of the mixed fluid a from the injection nozzle 63, the injection of the injection nozzle 62 in conjunction with the movement of the lifting rod 70 of the landing detection means 65. Since the angle of the direction is automatically changed, the flow rate ratio of the mixed fluid a to the injection nozzle 62 provided in the pumping path 7 and the injection path 7a according to the distance between the sand pump 4 and the hole bottom, and the injection Control of the injection direction of the mouth nozzle 63 is performed in conjunction.

  As shown in FIGS. 12 to 16, the measurement path 79 of the mixed fluid a is branched and connected to the discharge pipe 60 of the sand pump 4, and the mixed fluid a sucked up by the sand pump 4 is caused to flow into the measurement path 79. Is detected in real time and the distribution of slime in the drilling hole 1 is grasped, so that the vertical movement and horizontal movement of the sand pump 4 are controlled from the ground, and the replacement work of the slime and the stable liquid in the drilling hole 1 is accurately performed. It is designed to be efficient.

  A storage chamber 81 incorporating a filter cylinder 80 is provided in the upstream side of the connection portion of the branch pipe 62 of the discharge pipe 60 in the pumping path 7, and the measurement path 79 includes an upstream pipe 79a and a downstream side. An upstream pipe 79a is connected to the storage chamber 81, and the downstream pipe 79b is connected to the upstream pipe 79a via a three-way switching valve 82. The downstream pipe 79b rises vertically. Is provided with a property measuring means 83 such as a Coriolis mass flow meter, and a part of the mixed fluid sucked up by the sand pump 4 is caused to flow into the measuring path 79, and the property measuring means 83 uses the stable liquid concentration or density of the mixed fluid. The value is measured, and the pumping position of the sand pump 4 is controlled based on the measurement result.

  A power line and a control line for the three-way switching valve 82 and a power line and a control line for the property measuring unit 83 are connected to the box 84 that houses the property measuring unit 83.

  The property measuring means 83 is installed in the middle of the measurement path 79 as shown in the figure, or adopts a structure in which it is incorporated directly into the upstream side of the branch pipe 62 in the middle of the pumping path 60, or sand. You may make it provide in the external vicinity position of the pump 4. FIG.

  Since the property measuring means 83 provided in the measurement path 79 and the measurement path 79 itself are continuously used, slime or the like adheres with the passage of the detection time and the detection accuracy decreases. A backwash pipe 86 is connected so that the suction port 85 faces the suction port 56 of the sand pump 4.

  During normal pumping by the sand pump 4, the three-way switching valve 82 blocks communication between the measurement path 79 and the backwash pipe 86, and the mixed fluid a flows from the upstream pipe 79 a to the downstream pipe 79 b of the measurement path 79. The stable liquid concentration or density value of the mixed fluid a is measured by the property measuring means 83.

  When such a measurement is performed for a predetermined time, the three-way switching valve 82 is switched for a certain time, the upstream pipe 79a is shut off, and the backwash pipe 86 is connected to the downstream pipe 79b. Since a negative pressure is generated at the suction port 85 by the flow of the mixed fluid toward 56, a suction force acts on the downstream side pipe 79 b due to this negative pressure, and the downstream side pipe 79 b extends above the sand pump 4. Therefore, the mixed fluid in the drilling hole 1 located above the sand pump 4 is sucked into the downstream pipe 79b, whereby the flow of the mixed fluid a from the downstream pipe 79b toward the backwash pipe 86 is caused. The detection accuracy is restored and maintained by cleaning the inner circumference of the property measuring means 83 and the upstream pipe 79a by the back flow of the mixed fluid a to the property measuring means 83. Door can be.

  The property measurement result of the mixed fluid a by the property measurement unit 83 is not shown in the figure, but is managed and recorded in time series using a slime property management unit on the ground such as a general-purpose computer equipped with a PLC and a monitor. Then, the slime automatic mud lifting device A is controlled to move the sand pump 4.

  Next, the automatic mud raising method using the slime automatic mud raising device of this invention is demonstrated.

  As shown in FIG. 1 and FIG. 2, the slime automatic mud lifting device A is set to the drilling hole 1 excavated in the ground, and the discharge side end portion of the hose 8 connected to the discharge port 57 of the sand pump 4, A slime treatment device installed on the ground is connected by a mud pumping route, and a stabilizing liquid supply means is installed between the slime treatment device and the drilling hole.

  The pump moving arm 13 is inclined at a predetermined angle, and the sand pump 4 suspended from the pump moving arm 13 by the wire 5 is settled in the drilling hole 1 by the wire feeding of the winch 26. At this time, the flow rate adjusting mechanism 64 is such that the first flow rate control valve 66 of the discharge pipe 60 is in the open phase and the second flow rate control valve 67 of the branch pipe 62 is in the closed phase, and the three-way switching valve 82 is 79, the upstream pipe 79a and the downstream pipe 79b are connected to each other.

  In the above state, the sand pump 4 is activated, and the mixed fluid a in the drilling hole 1 sucked up from the suction port 56 is sent to the ground from the discharge port 57 via the mud path 7 and the hose 8, Then, a new stabilizing liquid is supplied in an amount corresponding to the pumping mud, and the mixed fluid a in the drilling hole 1 is replaced with a new stabilizing liquid (discharge mode).

  When the mixed fluid a is mud, a part of the mixed fluid a sucked up by the sand pump 4 passes through the measurement path 79 and is discharged into the drilling hole 1, and property measuring means 83 provided in the middle of the measurement path 79. Is measured by measuring the stable liquid concentration or density value of the mixed fluid a passing through, and measuring the distribution of slime in the portion where the sand pump 4 is located, and sending the information to the slime property management means on the ground. The slime automatic mud lifting device A is controlled.

  That is, when the mixed fluid a is sucked up with the sand pump 4 suspended at a certain position and the amount of slime contained in the mixed fluid a is large, the mixed fluid a is not moved at the position without moving the sand pump 4. When the amount of slime contained in the mixed fluid a decreases, the sand pump 4 is moved by a fixed distance in a plane, and the mud is pumped at another position on the same plane, and thus the same plane. When the distribution of slime is reduced, the sand pump 4 is lowered by a predetermined amount, the above-described muddying operation is performed again at the lowered position, and this is repeated until the bottom of the hole 1 is reached.

  Here, the planar movement of the sand pump 4 can be performed by using the turning movement of the pump moving arm 13 and the change in the undulation angle of the pump moving arm 13 singly or in combination in the slime automatic mud lifting apparatus A. 4 can be lowered by feeding the wire 5 out of the drum 26a.

  When the above-described muddying operation is performed for a predetermined time, the three-way switching valve 82 is communicated with the downstream pipe 79b of the measuring path 79 and the backwash pipe 86 in accordance with a command from the ground while the muddying operation is performed. Thus, the property measuring means 83 is cleaned by restoring a detection performance by flowing a relatively clean stabilizing liquid from the downstream pipe 79b of the measurement path 79 to the backwash pipe 86. .

  When the replacement of the mixed fluid a in the drilling hole 1 and the clean stabilizing liquid proceeds as described above and the sand pump 4 reaches the hole bottom of the drilling hole 1, the sand pump 4 is attached by the landing detection means 65 and 65a. It will detect the floor.

  By the way, the pile bottom portion of the drilling hole 1 is provided with an enlarged diameter portion 3 excavated larger than the outer diameter of the pile. Of course, slime is also present in the enlarged diameter portion 3, but it is suspended by the wire 5. Since the lowered sand pump 4 is restricted in movement toward the inner peripheral surface side by the inner diameter of the drilling hole 1, it cannot be positioned inside the enlarged diameter portion 3.

  Therefore, in the present invention, the sand nozzle 4 is provided with the injection nozzle 63 at a position facing the enlarged diameter portion 3 when the sand pump 4 is landed, and from the time when the lower end of the lifting rod 70 contacts the bottom of the hole. When the landing detection means 65 or 65a detects that the sand pump 4 has landed, the flow rate adjusting mechanism 64 is gradually switched, and the first flow rate control valve 66 of the mud path 7 is brought to a closed phase, The second flow control valve 67 of the branch pipe 62 is set to the valve opening phase (injection mode).

  As a result, the mixed fluid a sucked up by the sand pump 4 is reduced in the amount of mud to the ground, flows into the branch pipe 62 and is ejected from the spray nozzle 63 toward the outside of the sand pump 4. Flows into the expanded diameter portion 3 to forcibly generate convection from the expanded diameter portion 3 toward the suction port 56 of the sand pump 4 in the mixed fluid a in the expanded diameter portion 3. The slime located at is moved to the sand pump 4 side, whereby the slime in the enlarged diameter portion 3 is efficiently sucked and captured by the sand pump 4.

  Here, among the slime layers deposited in the hole 1, the slime concentration is higher in the lower layer, and there is a high density of gravel, and when the hole 1 has an expanded bottom structure, the slime layer is closer to the vicinity of the hole bottom. By changing the jet flow rate of the mixed fluid a in accordance with the hole bottom distance according to these conditions, the pore diameter is increased, and the diffusion of the deposited slime can be made efficient.

  In this state, when the sand pump 4 is slightly raised and the landing detection state by the landing detection means 65 or 65a is changed to the middle state or completely solved, the flow rate adjusting mechanism 64 causes the first flow control valve 66 of the discharge pipe 60. Becomes the valve opening phase, the second flow control valve 67 of the branch pipe 62 becomes the valve closing phase, and the mixed fluid a sucked up by the sand pump 4 is taken out from the discharge pipe 60 to the ground by the hose 8.

  When the sand pump 4 is lowered again, the first flow rate control valve 66 and the second flow rate control valve 67 of the flow rate adjusting mechanism 64 are switched to generate the jet flow of the mixed fluid a from the jet nozzle 63, thereby expanding the diameter. Convection from the portion 3 toward the suction port 56 of the sand pump 4 is generated, and the sand pump 4 is moved up and down several times in this manner, so that the slime in the enlarged diameter portion 3 is effectively produced by the flow of the mixed fluid a. And can be replaced with a clean stabilizer.

  In this case, the mixed fluid a sucked up by the sand pump 4 has properties such as a stable liquid concentration and a density value detected in real time by the property measuring means 83 of the measurement path 79, so that the property of the mixed fluid a is a predetermined value. By repeating the up and down movement of the sand pump 4 until it becomes, the slime in the enlarged diameter portion 3 can be surely replaced with a clean stable liquid, and the flow rate ratio of the mud and injection is changed based on the measurement result. Thus, it is possible to lift mud at a high concentration, and at the same time, it is possible to avoid dangerous work such as overloading of the sand pump 4 and clogging of the mud path 7.

  Further, as shown in FIGS. 17 to 20, when the injection direction of the injection nozzle 63 is changed according to the hole bottom distance, the injection nozzle 63 becomes in a horizontal posture by detecting the enlarged diameter portion. Since the mixed fluid a is jetted outward in the tangential direction of the sand pump 4, the mixed fluid a can be surely jetted to the enlarged diameter portion, and at the same time, excavation of the hole bottom ground by the jetted mixed fluid a is avoided. There is an advantage that you can.

  When the replacement of the mixed fluid a in the drilling hole 1 and the clean stabilizing liquid is completed as described above, the sand pump 4 is taken out from the drilling hole 1 and the rebar rod is inserted into the drilling hole 1 as is well known. The cast-in-place pile is constructed by placing concrete.

  In the illustrated embodiment, a first flow control valve 66 is provided in the pumping path 7, a second flow control valve 67 is provided in the injection path 7 a, and both flow control valves 66 and 67 are controlled in synchronization. Thus, the flow rate ratio between the mud path 7 and the injection path 7a is changed, but only one of the mud path 7 and the injection path 7a is provided with a flow rate control valve. It is also possible to change the flow rate ratio by controlling.

  Further, the mud pumping by the slime pumping method and apparatus of the present invention can be used not only for the construction of cast-in-place concrete piles but also for the construction of underground underground walls.

A Slime automatic mud lifting device 1 Drilling hole 2 Stand pipe 3 Expanded part 4 Sand pump 5 Wire 6 Cable 7 Mud passage 7a Injection route 8 Hose 9 Base frame 10 Swivel wheel 11 Swivel frame 12 Support base 13 Pump moving arm 14 Hydraulic pressure Motor 15 Hose drum 16 Strut 17 Movable table 18 Axis 19 Cylinder 20 Cable reel 21 Hydraulic motor 22 Bracket 23 Guide pulley 24 Guide pulley 25 Guide roller 26 Winch 26a Drum 27 Hose guide 28 Lifting cylinder 29 Hydraulic unit 30 Exit side pulley 31 Enter Side pulley 32 Dynamic pulley 33 Weight 34 Equalizer member 35 Stopper 36 Spring 37 Landing detector 38 Landing detection sensor 39 Lower limit sensor 40 Bearing 41 Cylindrical shaft 42 Box 43 Disc 44 Reel mounting shaft 45 Outlet 6 Cylindrical shaft 47 Flange 48 Coupling portion 49 Winding drum 50 Plug 51 Bolt 52 Stand 53 Pump chamber 54 Impeller 55 Casing 56 Suction port 57 Discharge port 58 Motor 59 Strainer 60 Discharge pipe 61 Annular pipe 62 Branch pipe 63 Injection nozzle 64 Flow rate Adjustment mechanism 65 Landing detection means 66 First flow control valve 67 Second flow control valve 68 Valve shaft 69 Rod guide 70 Lifting rod 71 Landing member 72 Link 73 Lever 74 Equalizer 75 Swing arm 76 Pulley 77 Connecting member 78 Spring 79 Measuring path 80 Filter cylinder 81 Reservoir chamber 82 Three-way switching valve 83 Property measuring means 84 Box 85 Suction port 86 Backwash pipe 91 Angle control mechanism 92 Fixed ring 93 Guide roller 94 Movable ring 95 Pivot 96 Lever 97 Link 98 Plate cam 99 Cam groove 100 Upward plate 1 1 pivot 102 swing lever 103 sheave 104 links

Claims (8)

In the slime pumping method that mixes the slime in the drilling hole with the stabilizing liquid and transports the fluid,
A part or all of the mixed fluid of slime and stabilizing liquid sucked by the pumping means is re-injected into the drilling hole from the injection port provided after the suction port of the pumping means. On the other hand, a slime pumping method characterized by forcibly generating convection and disturbing the mixed fluid around the pumping means by a single pumping means to pump the mud.   2. The flow rate ratio between the amount of muddying of the mixed fluid of the muddying means and the amount of injection into the drilling hole is changed according to the distance between the muddying means and the bottom of the drilling hole. Slime deep mud method.   Measure the concentration or density value of the mixed fluid pumped by the above-mentioned mud pumping means or the mixed fluid in the borehole around the pumping means, and confirm the properties of the mixed fluid in the borehole based on this measured value 3. The slime mud pumping method according to claim 1 or 2, wherein a flow rate ratio between a mud pumped amount of the mixed fluid of the mud pumping means and an injection amount into the bore is controlled.   The slime according to any one of claims 1 to 3, wherein the fluid injection direction of the injection nozzle for injecting the mixed fluid into the drilling hole is changed according to the distance between the pumping means and the drilling hole bottom. The mud method.   The transport path of the mud means for sucking the mixed fluid of slime and stabilizing liquid in the drilling hole has an injection path for ejecting the mixed fluid that has been pumped to the periphery of the mud means and a mud path for pumping the mud to the ground. A slime pumping device provided with a flow rate adjusting mechanism for changing the flow rate ratio of the mixed fluid flowing in the jet route and the pumping route in the transport route.   The slime mud lifting apparatus according to claim 5, wherein the flow rate adjusting mechanism changes a flow rate ratio according to a distance between the mud lifting means and the drill hole bottom.   The flow rate adjusting mechanism is formed by measuring means for measuring the concentration or density value of the mixed fluid conveyed by the mud lifting means, or measuring means for measuring the concentration or density value of the mixed fluid in the borehole around the lifting mud means. 6. The slime mud lifting device according to claim 5.   An angle control mechanism is provided that makes the fluid ejection direction of the ejection nozzle provided in the ejection path variable, and changes the fluid ejection direction of the ejection nozzle according to the distance between the pumping means and the bottom of the drill hole. Item 8. The slime frying device according to any one of Items 5 to 7.

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