JP5775786B2 - Ground improvement chemical injection support system - Google Patents

Description

  The present invention relates to a ground improvement chemical solution injection support system, and more specifically, when performing a ground improvement chemical solution injection operation using a double pipe, alignment of the discharge port of the inner tube and the injection port of the outer tube is performed. The present invention relates to a ground improvement chemical injection support system that can perform with high accuracy and improve work efficiency.

  In order to strengthen the ground, various methods for injecting a ground improvement chemical into the target ground using a double pipe have been proposed (for example, see Patent Document 1). When injecting the ground improvement chemical solution into the ground, the inner pipe inserted into the outer pipe is moved up and down, so that the discharge port provided in the peripheral wall of the inner pipe is positioned at the inlet provided in the peripheral wall of the outer pipe. In addition, the chemical solution discharged from the discharge port is injected into the ground through the injection port. Normally, the outer tube is formed with multiple injection ports at intervals in the vertical direction, so that the inner tube is moved up and down sequentially, and the discharge ports are aligned with the injection ports at the respective locations. Inject.

  By the way, the alignment operation between the discharge port and the injection port is performed, for example, by attaching a tape or the like to the inner tube with a predetermined interval in the vertical direction and inserting it into the outer tube, and then inserting the upper end of the outer tube. The position of the discharge port is grasped on the basis of the tapes of the inner pipe exposed from the nozzle and is aligned with the injection port whose depth position is grasped in advance. As described above, since the tapes attached to the inner tube were used as a guideline, the positioning of the discharge port and the injection port was not highly accurate. If the alignment is insufficient, the chemical solution is wasted and extra injection time is required. And, in order to align accurately, if the alignment operation is performed many times, the operation time becomes long, leading to a decrease in operation efficiency.

  Also, in the operation of simply aligning the discharge port and the injection port with the tapes affixed to the inner tube as a guideline, whether the chemical solution was injected with the discharge ports aligned with all the required injection ports I can't confirm. Therefore, since it is necessary to pay great attention so as not to forget to inject the chemical solution from the necessary injection port and proceed with the operation, it is a disadvantageous method for improving the work efficiency.

JP 2009-2154 A

  It is an object of the present invention to accurately align the discharge port of the inner tube and the injection port of the outer tube and improve the work efficiency when performing a ground improvement chemical solution injection operation using a double tube. An object of the present invention is to provide an injection support system for a ground improvement chemical solution that can be used.

In order to achieve the above object, the ground improvement chemical solution injection support system of the present invention comprises an outer tube having an injection port for injecting a chemical solution into the ground on the peripheral wall, and the chemical solution inserted into the outer tube so as to be movable in the tube axis direction. Connected to the upper end of the inner tube, an inner tube having a discharge port in the peripheral wall, a magnetic member fixed to the outer peripheral surface of the outer tube, a magnetic sensor fixed to the outer peripheral surface of the inner tube , A cord length device for detecting the movement length of the cord-like member, a calculation device to which a detection signal by the magnetic sensor and a detection length by the cord length device are input, and a monitor connected to the calculation device. When the chemical solution supplied through the inner pipe is discharged from the discharge port and injected into the ground from the injection port , the gap between the injection port and the magnetic member, which is grasped in advance, the discharge port and the magnetic sensor Interval, detection signal and detection length Based on, to calculate the positional relationship between the inlet and the outlet by the computing device, and displays the positional relationship on the monitor, the inlet and injecting the drug solution, that is injected been to the arithmetic unit By inputting, the fact that the injection has been completed is displayed on the monitor .

  According to the present invention, when the inner tube is inserted into the outer tube and moved in the tube axis direction, the position of the magnetic member can be grasped by the detection signal detected by the magnetic sensor, and the detection length detected by the cord length device. The movement length of the inner pipe can be grasped by the above, and the interval between the injection port and the magnetic member and the interval between the discharge port and the magnetic sensor are grasped in advance. Can be accurately calculated and displayed on the monitor. Therefore, by adjusting the position in the tube axis direction of the inner tube while referring to the positional relationship between the inlet and outlet displayed on the monitor, compared to the conventional method, the outlet of the inner tube and the outer tube Positioning with the inlet can be performed with high accuracy. In addition, since a magnetic sensor is used, the burden of caution when aligning the discharge port and the injection port and the burden of caution when injecting a chemical without forgetting it through the necessary injection port are alleviated. It will be advantageous to improve.

  Here, as the magnetic member, a magnetic tape having an adhesive surface on a surface in contact with the outer peripheral surface of the outer tube can be used. Thereby, a magnetic member can be easily fixed to the desired position of the outer peripheral surface of an outer tube | pipe.

In the present invention, the inlet to inject the liquid by entering that the injection already on the computing device, for that the injection already in configuration to be displayed on the monitor. Thereby, the malfunction of forgetting the chemical | medical solution injection | pouring operation | work from a required inlet can be prevented.

For example, an insertion hole bent in the middle is formed in the ground, and the outer tube is inserted along the insertion hole. The positional relationship between the injection port and the discharge port may be displayed in real time on the monitor. As a result, the positional relationship between the two can be grasped at a glance, which is advantageous for improving work efficiency.

It is a schematic diagram of the injection | pouring assistance system of the ground improvement chemical | medical solution of this invention. It is explanatory drawing which illustrates the state which inserted the inner tube | pipe which supplies a quick setting solidification liquid in the outer tube | pipe. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is explanatory drawing which illustrates the state which is inject | pouring the instantaneous setting solidification liquid into the ground. It is explanatory drawing which illustrates the state which inserted the inner pipe | tube which supplies a ground improvement chemical | medical solution to the outer pipe | tube. It is B1-B1 sectional drawing of FIG. It is explanatory drawing which illustrates the state which is inject | pouring the ground improvement chemical | medical solution into the ground. It is explanatory drawing which illustrates the state which has formed the insertion hole. It is explanatory drawing which shows another example of an outer tube | pipe. It is explanatory drawing which illustrates the state which supplies the instantaneous setting solidification liquid from the inner tube inserted in the outer tube | pipe of FIG. 10, and is expanding the outer tube | pipe packer. It is explanatory drawing which illustrates the state which is inject | pouring the instantaneous setting solidification liquid into the ground.

  Hereinafter, the ground improvement chemical injection support system of the present invention will be described based on embodiments. In FIGS. 1, 2, 5, 6, 8, and 10 to 12, the outer tube 3 is shown in a vertical cross section in order to clarify the internal structure.

  As illustrated in FIGS. 1 to 4, the ground support chemical injection support system according to the present invention includes an outer tube 3 inserted into an insertion hole S formed by drilling the ground, and inserted into the outer tube 3. And an inner tube 5A movable in the outer tube axis direction. The inner tube 5A supplies the instantaneous solidifying liquid C. Further, apart from the inner tube 5A, there is an inner tube 5B inserted into the outer tube 3 and movable in the outer tube axis direction. The inner pipe 5B supplies the ground improvement chemical solution G. In this embodiment, a cylindrical body whose tip is sealed is used as the outer tube 3 and the inner tubes 5A and 5B. The outer tube 3 is a resin tube and is made of, for example, vinyl chloride. Many portions of the inner pipes 5A and 5B are made of a flexible material such as rubber.

  The peripheral wall of the outer tube 3 is formed with a plurality of injection ports 3a communicating with the inner side of the tube and the outer side of the tube, spaced apart in the axial direction of the outer tube. The size of the injection port 3a is, for example, about 3 mm to 10 mm in diameter. Further, two inflatable outer tube packers 16 are provided on the outer peripheral surface of the outer tube 3 so as to be separated from each other in the outer tube axial direction. The two outer tube packers 16 are arranged such that at least one injection port 3a exists on the peripheral wall of the outer tube 3 between them. Examples of the outer tube packer 16 include a swelling material that absorbs moisture and expands, or a sealing material that can be expanded and contracted by the fluid pressure of gas or liquid flowing into and out of the inside.

  The inlet 3a disposed between the outer tube packers 16 is covered with a check valve 17 that is a cover member. The check valve 17 is, for example, a ring-shaped metal fixture that is fitted around the outer tube 3 by wrapping a belt-like member made of an elastic material such as rubber around the outer tube 3 so as to cover the inlet 3a. 14 is attached to the outer tube 3. The check valve 17 abuts two belt-like bodies at a position on the inlet 3a.

  The injection ports 3a other than the injection port 3a disposed between the outer tube packers 16 are covered with a porous coating material 15 as a cover member. The porous coating material 15 has a large number of through-holes having an area smaller than that of the injection port 3a, and is formed of resin, metal, or the like. Examples of the form of the porous coating material 15 include a mesh body such as a resin mesh and a metal mesh, and a porous plate. The thickness of the porous coating material 15 is set to about 0.2 mm to 1.0 mm, for example, and a specification having a large number of minute through holes is preferable. Alternatively, a tubular braided body formed by braiding resin fibers can be used as the porous coating material 15. For example, a plurality of nylon resin fibers having a wire diameter of about 0.1 mm to 0.5 mm are juxtaposed to form a belt-like body, and the plurality of belt-like bodies are knitted at a predetermined braiding angle to form a cylinder.

  The porous coating material 15 is attached to the outer tube 3 by a ring-shaped metal metal fixture 14 fitted on the outer tube 3. A check valve 17 may be attached in place of the porous coating material 15.

  The inner pipe 5A has two inflatable and contractible packers 6a spaced apart in the inner pipe axis direction on the outer peripheral surface thereof, and the inner wall between the two inflatable and inflatable packers 6a has the instantaneous solidifying liquid C. Discharge port 5a for supplying C1 liquid and discharge port 5b for supplying C2 liquid are arranged. The inside of the inner pipe 5A is divided into two as illustrated in FIG. 3, and two channels are formed, a solidified liquid flow path 7a through which the C1 liquid flows and a solidified liquid flow path 7b through which the C2 liquid flows. It has become.

  Inside the inner tube 5A, packer expansion pipes 8a extend in the inner tube axis direction and are connected to the respective packers 6a. The packer 6a is formed of a hollow elastic body such as rubber that can be expanded and contracted, expands by inflow of fluid through the packer expansion pipe 8a, and contracts by outflow of fluid.

  As shown in FIGS. 6 and 7, the other inner pipe 5B has two inflatable / expandable packers 6b spaced from each other in the axial direction of the inner pipe on the outer peripheral surface thereof. The discharge port 5c which supplies the ground improvement chemical | medical solution G is arrange | positioned at the surrounding wall between. The inside of the inner pipe 5B is a chemical solution flow path 7c through which the ground improvement chemical solution G flows.

  Inside the inner pipe 5B, packer expansion pipes 8b extend in the inner pipe axis direction and are connected to the respective packers 6b. The packer 6b is formed of a hollow elastic body that can be expanded and contracted, such as rubber. The packer 6b expands by inflow of fluid through the packer expansion pipe 8b and contracts by outflow of fluid.

  The injection support system further includes a magnetic member 10 fixed to the outer peripheral surface of the outer tube 3, a magnetic sensor 9 fixed to the outer peripheral surface of the inner tubes 5 </ b> A and 5 </ b> B, a calculation device 12, and a calculation device 12. The cable 11 and the monitor 13 to be connected are provided. The rope lengther 11 is, for example, a wire type linear encoder. A string-like member 11a such as a wire is connected to the upper ends of the inner pipes 5A and 5B, and the length of the string-like member 11a (feeding and feeding length) is detected by the cord length unit 11.

  The magnetic sensor 9 is connected to the arithmetic device 12 by wire or wireless. The magnetic sensor 9 is covered with, for example, a resin cover and protected from external force. In order to protect the magnetic sensor 9 from external moisture, the magnetic sensor 9 is made waterproof.

  As the magnetic member 10, for example, a magnetic tape in which a surface in contact with the outer peripheral surface of the outer tube 3 is an adhesive surface can be used. A magnet or the like can be used, but in the case of a magnetic tape, it can be easily fixed at a desired position on the outer peripheral surface of the outer tube 3 and can be easily removed. The magnetic tape may be wound around the outer peripheral surface of the outer tube 3 one or more times. Thereby, even if the inner pipes 5A and 5B inserted into the outer pipe 3 rotate around the pipe axis direction, if the magnetic sensor 9 comes to a position corresponding to the magnetic tape, the circumferential position of the magnetic sensor 9 Regardless, the magnetic tape can be detected. That is, the magnetic member 10 can be reliably detected by the magnetic sensor 9.

  The magnetic member 10 can be provided at only one location, but when the injection port 3a is present at a plurality of locations (ranges), it is provided at a plurality of locations corresponding to the locations (ranges) of the respective injection ports 3a. You can also.

  The arithmetic unit 12 is, for example, a personal computer, and the movement length is input to the detection signal when the magnetic sensor 9 detects the magnetic member 10 and the string-like member 11 a detected by the cord length unit 11. Further, since the interval in the tube axis direction between the injection port 3a and the magnetic member 10 and the interval in the tube axis direction between the discharge ports 5a, 5b, 5c and the magnetic sensor 9 are known, these intervals that are known in advance are calculated by the arithmetic unit 12. Has been entered.

  In the case where the injection ports 3a are provided at a plurality of locations (ranges), it is only necessary to input the distance in the tube axis direction between the single inlet 3 and the magnetic member 10 that are representative at each location (range). When there are a plurality of discharge ports 5a, 5b, and 5c, the distance between the representative discharge ports 5a, 5b, and 5c and the magnetic sensor 9 in the tube axis direction may be input in each of the inner tubes 5A and 5B.

  When the ground is improved and strengthened by using the ground improvement chemical solution injection support system of the present invention, first, as illustrated in FIG. 9, the casing rod 2 is extended from the hole drilling machine 1 to form the insertion hole S. Form. In FIG. 9, in order to improve the ground below the structure 18, the insertion hole S is bent in the middle, but when the insertion hole S is formed in the vertical direction as shown in FIG. The rod 2 is extended vertically downward. Next, after inserting the outer tube 3 into the casing rod 2, the outer tube 3 is installed in the insertion hole S by pulling the casing rod 2 to the ground.

Next, as illustrated in FIG. 2, the outer tube 3 is inserted into the drilled insertion hole S. Then, as illustrated in FIG. 5, the contracted outer tube packer 16 is brought into a state of being in contact with the inner peripheral surface of the insertion hole S or having a slight gap. Incidentally, the gap between the inner and outer circumferential surfaces of the outer tube 3 of the insertion hole S, may be left filled with a filler in advance cement bentonite.

  Next, in order to inject the instantaneous solidifying liquid C into the ground, the inner tube 5A inserted in the outer tube 3 is positioned at the inlet 3a disposed between the two expanded outer tube packers 16. It positions so that the discharge outlet 5a (5b) may match. At the time of this positioning, the packer 6a is contracted and moved in the tube axis direction in the outer tube 3 of the inner tube 5A.

  For example, the inner tube 5A is inserted into the outer tube 3 and gradually moved downward. During this movement, the magnetic sensor 9 detects the magnetic member 10. Since the distance between the injection port 3a and the detected magnetic member 10 in the tube axis direction and the distance between the discharge port 5a (5b) and the magnetic sensor 9 are known in advance, the injection port 3a and the discharge port 5a (5b) The positional relationship in the tube axis direction is calculated. Therefore, the moving distance of the inner tube 5A necessary for aligning the injection port 3a and the discharge port 5a (5b) is determined from the position where the magnetic sensor 9 detects the magnetic member 10.

  The calculated positional relationship between the injection port 3a and the discharge port 5a (5b) is displayed on the monitor 13, and the movement distance of the inner tube 5A is detected by the cord 11 and displayed on the monitor 13. Therefore, when the inner pipe 5A is moved by the necessary distance while referring to the display on the monitor 13, the alignment between the two is completed.

  In this way, the discharge port 5a (5b) and the injection port 3a can be accurately aligned as compared with the conventional method. In addition, since the burden of caution when aligning the discharge port 5a (5b) and the injection port 3a and the burden of caution for injecting a chemical solution through the necessary injection port 3a are reduced, work efficiency is improved. This is advantageous.

  Further, in the present invention, since the magnetic sensor 9 is used, erroneous detection is less likely to occur. For example, when a metal sensor is used, false detection may occur if a metal material is buried in the ground. When the magnetic sensor 9 is used, erroneous detection may occur if a magnetic material is embedded in the ground. However, the possibility that the metal material is buried in the ground and the possibility that the magnetic material is buried are much lower in the latter case. Therefore, the present invention is advantageous for preventing erroneous detection by the sensor.

  Further, the positional relationship between the injection port 3a and the discharge port 5a (5b) can be displayed and displayed in real time on the monitor 13, but the display is more preferable. By displaying the figure, if the monitor 13 is glanced, the positional relationship between the two can be grasped, which is advantageous in improving the work efficiency.

  After positioning the injection port 3a and the discharge ports 5a and 5b, the packer 6a is inflated and brought into pressure contact with the inner peripheral surface of the outer tube 3. In this state, the C1 liquid is supplied from the discharge port 5a, and the C2 liquid is supplied from the discharge port 5b. Thereby, C1 liquid and C2 liquid are mixed and it solidifies rapidly, and it becomes the quick setting solidified liquid C. Examples of the quick setting solidified liquid C include water glass grout, plastic grout and the like.

  Immediately before being injected into the ground in this way, the instantaneous solidifying liquid C obtained by mixing the C1 liquid and the C2 liquid is injected into the ground through the inlet 3a located between the two expanded packers 6a. The instantaneous solidifying liquid C supplied through the inner pipe 5A is pushed out through the injection port 3a so as to leak from the butting surface of the check valve 17 and injected into the ground. Since the injection port 3a for injecting the instantaneous solidifying liquid C is sandwiched between the two outer tube packers 16, the instantaneous solidifying liquid C is guided between the two outer tube packers 16 to the ground. To penetrate. Thereby, the gap between the inner peripheral surface of the insertion hole S and the outer peripheral surface of the outer tube 3 can be reliably sealed by the packer P formed of the instantaneous setting solidified liquid C.

  Next, the packer 6a is contracted, the inner tube 5A is pulled out from the outer tube 3, and another inner tube 5B is inserted into the outer tube 3 as illustrated in FIG. And it positions so that the discharge port 5c may match the position of the injection port 3a covered with the porous coating material 15. During this positioning, the packer 6b is kept in a contracted state.

  For example, the inner pipe 5B is gradually moved downward. During this movement, the magnetic sensor 9 detects the magnetic member 10. Since the distance between the injection port 3a and the detected magnetic member 10 in the tube axis direction and the distance between the discharge port 5c and the magnetic sensor 9 in the tube axis direction are known in advance, the distance between the injection port 3a and the discharge port 5c in the tube axis direction is known. The positional relationship is calculated. Therefore, the moving distance of the inner tube 5B necessary for aligning the injection port 3a and the discharge port 5c is found from the position where the magnetic sensor 9 detects the magnetic member 10.

  The calculated positional relationship between the injection port 3a and the discharge port 5c is displayed on the monitor 13, and the movement distance of the inner tube 5B is detected by the cord length device 11 and displayed on the monitor 13. Therefore, when the inner pipe 5B is moved by the necessary distance while referring to the display on the monitor 13, the alignment between the two is completed.

  In this way, it is possible to accurately align the discharge port 5c and the injection port 3a as compared with the conventional method. Moreover, since the burden of attention when aligning the discharge port 5c and the injection port 3a and the burden of attention for injecting a chemical solution through the necessary injection port 3a without being forgotten are reduced, work efficiency can be improved. Become advantageous.

  After positioning the injection port 3a and the discharge port 5c, the packer 6b is expanded and brought into pressure contact with the inner peripheral surface of the outer tube 3 as illustrated in FIG. In this state, the ground improvement chemical solution G is supplied from the discharge port 5c. Examples of the ground improvement chemical solution G include water glass grout, cement grout and the like.

  The supplied ground improvement chemical | medical solution G passes the porous coating | covering material 15 which covers the injection hole 3a, when inject | pouring into a ground. Therefore, even if the injection pressure is high, the pressure is reduced moderately by the porous coating material 15 so that the ground improvement chemical solution G does not simply go straight from the injection port 3a in the direction orthogonal to the outer tube axis (horizontal direction) but spread over a wide range. Become.

  When the ground improvement chemical solution G is injected into the ground at another height position, the outer tube packer 16 and the porous coating material 15 described above are also provided at another height position of the outer tube 3. Then, the inner tubes 5A and 5B inserted into the outer tube 3 are moved in the tube axis direction by the same procedure as described above, and the discharge port 5c and the target injection port 3a are aligned.

  That is, after the inner tube 5A is inserted into the outer tube 3 and the operation of injecting the instantaneous solidifying liquid C is completed at a required height position, the inner tube 5A is removed from the outer tube 3. Next, the inner pipe 5B is inserted into the outer pipe 3, and the ground improvement chemical solution G is sequentially injected into the ground at a necessary height position.

  As described above, in the present invention, the detection signal by the magnetic sensor 9 and the detection length by the cord length unit 11 are used for alignment between the target inlet 3a and the outlets 5a, 5b, and 5c. It is advantageous to improve the work efficiency because the burden of attention at the time of the alignment work and the burden of attention for injecting the instantaneous setting solid solution C and the ground improvement chemical solution G without forgetting through the necessary inlet 3a are reduced. Become.

  When the chemical solution (instantaneous solidifying solution C or ground improvement chemical solution G) is injected through the target injection port 3a, the calculation device 12 indicates that the chemical solution has already been injected into the calculation device 12 through the injection port 3a. It is good to input and memorize. And it is set as the structure which displays on the monitor 13 that it has already inject | poured through the inlet 3a. Thereby, the malfunction of forgetting to inject | pour a chemical | medical solution through the required inlet 3a can be prevented.

  In the above-described embodiment, the instantaneous setting solidified liquid C and the ground improvement chemical liquid G are supplied using different inner pipes 5A and 5B. An improved chemical solution G can also be supplied. In addition, the magnetic sensor 9 is provided in each of the inner pipes 5A and 5B. However, the present invention is applied only when the magnetic sensor 9 is provided only in the inner pipe 5B for supplying the ground improvement chemical solution G and the ground improvement chemical solution G is injected. It can also be applied.

  In the present invention, the outer tube packer 16 can be expanded by filling the inside thereof with the instantaneous solidifying liquid C. In this case, as illustrated in FIG. 10, injection ports 3 b and 3 c that communicate the inside and the outside of the tube are provided on the peripheral wall of the outer tube 3 at the position where the two inflatable outer tube packers 16 are provided. In other words, the two inflatable outer tube packers 16 are arranged at the positions where the injection ports 3b and 3c are formed. Then, the instantaneous solidifying liquid C is filled into the two outer tube packers 16 through the inlets 3b and 3c to be expanded.

  Specifically, check valves 17b and 17c are provided at the respective inlets 3b and 3c arranged in the front and rear in the tube axis direction with the inlet 3a for injecting the instantaneous solidifying liquid C into the ground. The check valves 17b and 17c are formed, for example, by winding a belt-like body made of an elastic body such as rubber around the surface of the outer tube 3 so as to cover the injection ports 3b and 3c. The expandable outer tube packer 16 is attached to the surface of the outer tube 3 so as to cover the check valves 17b and 17c.

  A check valve 17a is also provided at the inlet 3a for injecting the instantaneous solidifying liquid C into the ground. The check valve 17a is formed, for example, by winding a belt-like body made of an elastic body such as rubber around the surface of the outer tube 3 so as to cover the injection port 3a. The check valve 17a abuts two belt-like bodies at a position on the inlet 3a.

  When the outer tube packer 16 is expanded, as shown in FIG. 11, two expandable packers of the inner tube 5A inserted into the outer tube 3 are provided in the range where the outer tube packer 16 is provided. Position the discharge ports 5a and 5b so that the ranges between 6a overlap. The alignment between the range in which the outer tube packer 16 is provided and the range between the two packers 6a of the inner tube 5A is performed by the injection port 3a and the discharge ports 5a, 5b, 5c described in the previous embodiment. The detection signal of the magnetic sensor 10 and the detection length of the cord length device 11 are used.

  After positioning, each packer 6a is expanded and brought into pressure contact with the inner peripheral surface of the outer tube 3, and the C1 liquid is supplied from the discharge port 5a and the C2 liquid is supplied from the discharge port 5b. As a result, the instantaneous solidifying liquid C in which the C1 liquid and the C2 liquid are mixed pushes up the check valves 17b and 17c through the inlets 3b and 3c, and the check valves 17b and 17c and the surface of the outer tube 3 It passes through the gap and enters the outer tube packer 16. The instantaneous solidifying liquid C that has entered enters the outer tube packer 16 so that the outer tube packer 16 expands and comes into pressure contact with the inner peripheral surface of the insertion hole S.

  At the same time, as illustrated in FIG. 12, the instantaneous solidification liquid C supplied through the inner pipe 5A is extruded through the injection port 3a so as to leak from the butt surface of the check valve 17a and injected into the ground. . Since the injection port 3a for injecting the instantaneous solidifying liquid C is sandwiched between the two inflated outer tube packers 16, the instantaneous solidifying liquid C flows between the inner peripheral surface of the insertion hole S and the outer tube 3. It does not flow out into the gap with the outer peripheral surface of the. Therefore, the instantaneous setting solidified liquid C surely penetrates the ground and rapidly solidifies to form a strong packer P around the inlet 3a. Thereby, the gap between the inner peripheral surface of the insertion hole S and the outer peripheral surface of the outer tube 3 can be reliably sealed by the packer P formed of the instantaneous setting solidified liquid C.

  Here, before the instantaneous solidifying liquid C is supplied from the inlet 3a to the ground, in order to surely fill the outer tube packer 16 with the instantaneous solidifying liquid C and expand it, rather than through the inlet 3a. The structure is such that the quick-setting solidified liquid C can be easily supplied to the outside through the respective inlets 3b and 3c. Therefore, for example, the area of the inlet 3a for supplying the instant solidifying liquid C to the ground (in the case of a plurality of inlets 3a, the total area obtained by adding them) is given to the outer tube packer 16 as the instantaneous solidifying liquid C. Is smaller than the area of each of the inlets 3b and 3c (in the case of a plurality of inlets 3b and 3c, the total area obtained by adding them). Alternatively, the check valve 17a is less elastically deformed than the check valves 17b and 17c. Alternatively, the area of each injection port 3b, 3c is larger than the area of the injection port 3a, and the check valve 17a is less elastically deformed than each check valve 17b, 17c, so The structure is such that the quick-setting solidified liquid C can be easily supplied to the outside through the inlets 3b and 3c.

  Further, of the inlets 3b and 3c, the inlet 3c on the distal end side of the outer tube 3 located far from the supply source of the instantaneous solidifying liquid C is less likely to supply the instantaneous solidifying liquid C to the outside. . When the outer tube 3 extends vertically, the lower injection port 3c located far from the supply source of the instantaneous solidifying liquid C has an instantaneous setting property compared to the upper injection port 3b. It becomes difficult to supply the solidified liquid C to the outside.

  Therefore, for example, the area of the inlet 3c (the total area obtained by adding them in the case of a plurality of inlets 3c) is calculated from the area of the inlet 3b (the total area obtained by adding them up in the case of the plurality of inlets 3b). Also make it bigger. Alternatively, the check valve 17b is less likely to be elastically deformed than the check valve 17c. Alternatively, the area of the injection port 3c is made larger than the area of the injection port 3b, and the check valve 17b is less likely to be elastically deformed than the check valve 17c.

  If the outer tube packer 16 is inflated by the instantaneous setting solidified liquid C as described above, it is not necessary to provide a special pipe for circulating the fluid for expanding the outer tube packer 16.

DESCRIPTION OF SYMBOLS 1 Hole cutter 2 Casing rod 3 Outer pipe | tube 3a, 3b, 3c Inlet 4 Anchor 5A, 5B Inner pipe | tube 5a, 5b, 5c Discharge port 6a, 6b Expandable / shrinkable packer 7a, 7b Solidified liquid flow path 7c Chemical liquid flow path 8a, 8b Packer expansion pipe 9 Magnetic sensor 10 Magnetic member 11 Rope 11a String member 12 Arithmetic unit 13 Monitor 14 Metal fixture 15 Porous coating material (cover member)
16 Outer tube packer 17, 17a, 17b, 17c Check valve (cover member)
18 Structure S Insertion hole G Ground improvement chemical P Packer C Instantaneous solidification liquid

Claims (4)

An outer tube having an injection port for injecting a chemical solution into the ground on the peripheral wall, an inner tube having a discharge port inserted into the outer tube so as to be movable in the axial direction of the tube and discharging the chemical solution on the peripheral wall, and an outer periphery of the outer tube A magnetic member fixed to a surface, a magnetic sensor fixed to the outer peripheral surface of the inner tube , a cord length device for detecting a moving length of a string-like member connected to an upper end portion of the inner tube, and the magnetic An arithmetic device to which a detection signal by a sensor and a detection length by the cord length device are input, and a monitor connected to the arithmetic device, and the chemical solution supplied through the inner pipe is discharged from the discharge port to When injecting into the ground from the injection port , the arithmetic unit calculates the injection based on the previously known interval between the injection port and the magnetic member, the interval between the discharge port and the magnetic sensor, the detection signal and the detection length. Calculate the positional relationship between the inlet and outlet And displays the positional relationship on the monitor, the inlet and injecting the drug solution, by inputting that the injection already on the computing device, and the display means displays that the injection already on the monitor An injection support system for ground improvement chemicals.   The ground support chemical injection support system according to claim 1, wherein the magnetic member is a magnetic tape having a surface that contacts an outer peripheral surface of the outer tube as an adhesive surface. The ground support chemical injection support system according to claim 1 or 2, wherein an insertion hole bent in the middle is formed in the ground, and the outer tube is inserted along the insertion hole .   The ground support chemical injection support system according to any one of claims 1 to 3, wherein the positional relationship between the injection port and the discharge port is displayed in real time on the monitor.

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