JP2006183268A - Grouting construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grouting construction method which enables a part of an outer-pipe ejection port to be closed by increasing a length by means of an expansion/contraction packer, can make an inner-pipe ejection port vertically movable, and enables concurrent grouting by the provision of the three or more expansion/contraction packers. <P>SOLUTION: An inner pipe 5 with the three or more expansion/contraction packers 6 are loosely inserted into an outer pipe 3 which is installed in the ground 1, a fluid is fed into the packer 6 and expanded so that a grouting liquid can be concurrently injected from an inner-pipe ejection port 7, subsequently, the fluid is discharged from the packer 6 so that the packer can be contracted, and after a grouting stage is moved by moving the inner pipe 5, the packer 6 is expanded so that the grouting liquid can be repeatedly and concurrently injected into the ground 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ground injection method for soft ground, water leakage ground, etc., and in particular, the expansion and contraction of a packer can be freely performed by using an expansion and contraction packer as a packer. Therefore, the outer tube is formed by lengthening and expanding the packer. The inner tube can be moved up and down in the outer tube by closing a part of the discharge port and contracted, and more than two outer tubes can be provided by providing three or more expansion / contraction packers. It is possible to inject from the outlet at the same time, so that not only is it possible to perform combined injection with superposition of grout and permeable grout, but also ground injection that can be injected simultaneously from multiple outer pipe outlets Concerning construction method.

  Conventionally, an injection method using an injection pipe 20 shown in FIG. 11 is known as a ground injection method for soft ground, leaked ground, and the like. (Patent No. 2772637)

  In FIG. 11, the injection tube 20 has an outer tube 21 and an inner tube 22, and when installing in the ground 23, the outer tube 21 is first installed in the ground 23. In the outer tube 21, a plurality of arbitrary discharge ports 25, 25... 25 are opened in the tube wall 24 at different positions in the axial direction. Each of the discharge ports 25 is covered with a rubber sleeve 26.

  Next, the inner tube 22 is loosely inserted into the outer tube 21. Arbitrary plural injection ports 28, 28... 28 are also opened in the inner wall 21 in the tube wall 27 at different positions in the axial direction. The injection ports 28, 28,... Are opened as small as possible, thereby generating a pipe internal pressure with respect to the amount of liquid to be injected per minute in the inner tube 22, and the injection liquid from the injection port 28 to the space 31. It is made to spray in.

  Further, at least three packers 30, 30... 30 are arranged at intervals in different positions in the longitudinal direction of the conduit 29 formed in the gap between the inner tube 22 and the outer tube 21, so that they are adjacent to each other. A plurality of independent spaces 31 are formed in the longitudinal direction between the combined packers 30, 30, that is, between the adjacent upper and lower packers 30, 30. Moreover, the packers 30 and 30 are arranged so that at least one outer tube discharge port 25 and inner tube injection port 28 are positioned in each space 31.

  Using the injection tube device 20 configured as described above, first, the sleeve grout 32 is injected into the gap between the outer tube 21 and the ground 23 and sealed. Next, an injection solution is introduced from the conduit 22a of the inner tube 22, and the injection solution is injected into the spaces 31, 31 from the injection ports 28, 28,. , 31, 31, the rubber sleeve 26 is pushed and expanded through the discharge port 25 of the outer tube 21, and the sleeve grout 32 is broken and injected into the ground 23.

However, the packer 30 existing in the injection tube 20 of the above-mentioned known technology is composed of a rubber ring, and therefore the inner tube 22 cannot be moved, and the packer cannot be made long, Therefore, it is impossible to perform a composite injection in which a quick setting grout or a penetrating grout is superimposed. Furthermore, in the above-described known injection pipe 20, when the earth pressure is applied and deformed, the inner pipe cannot move at all.
Japanese Patent No. 2772637

  Therefore, the problem to be solved by the present invention is to use three or more expansion / contraction packers as a packer instead of a rubber ring, to make the packer long and inflated to close a part of the outer tube discharge port. In addition, the inner tube can be moved up and down by contraction, so that not only is it possible to perform combined injection in which instantaneous grouting and permeable grouting are superimposed, but also multiple outer tube discharges. An object of the present invention is to provide a ground injection method which can be simultaneously injected from an outlet and which has improved the above-described drawbacks of the known technology.

  In order to solve the above-described problems, according to the present invention, an outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and three outer pipes at different positions in the longitudinal direction are installed in the outer pipe. An inner tube having at least two expansion / contraction packers and having an inner pipe discharge port between adjacent expansion / contraction packers is loosely inserted, and a fluid is sent to the three or more expansion / contraction packers. Two or more outer tube inner spaces are formed between the expansion and contraction packers adjacent to each other, and an injection solution is simultaneously injected from the inner tube discharge port into the ground through the outer tube inner space and the outer tube discharge port. .

  Furthermore, in order to solve the above-described problems, according to the present invention, an outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and the positions in the longitudinal direction are different in the outer pipe. Three or more expansion / contraction packers are installed in the inner pipe, and an inner pipe having an inner pipe discharge port is loosely inserted between the expansion / contraction packers adjacent to each other. Inflating the contraction packer to form two or more outer tube inner spaces between adjacent expansion / contraction packers, and simultaneously injecting the injection solution from the inner tube discharge port into the ground through the outer tube inner space and the outer tube discharge port, The fluid is discharged from the expansion / contraction packer, the expansion / contraction packer is contracted, the inner tube is moved, the inner tube discharge port is aligned with the other outer tube discharge port, the injection stage is moved, and then the expansion / contraction packer is expanded. To form a space in the outer tube, and repeatedly inject the injection solution into the ground in the same way And it features.

  Furthermore, in order to solve the above-described problems, according to the present invention, an outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and the positions in the longitudinal direction are different in the outer pipe. Three or more expansion / contraction packers are installed in the inner pipe, and a plurality of inner pipes, each having an inner pipe discharge port located separately, are loosely inserted between the expansion / contraction packers adjacent to each other, and fluid is passed through the three or more expansion / contraction packers. To expand the expansion / contraction packer to form two or more outer tube inner spaces between the adjacent expansion / contraction packers, and the injection liquid from the inner tube discharge port to the ground through the outer tube inner space and the outer tube discharge port It is characterized by simultaneous injection.

  Furthermore, in order to solve the above-mentioned problem, according to the present invention, an outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and the longitudinal direction is set in the outer pipe. There are three or more expansion / contraction packers at different positions, and between the expansion / contraction packers adjacent to each other, a plurality of inner pipes each having an inner pipe discharge port located separately are loosely inserted, and the three or more expansion / contraction packers are provided. The expansion / contraction packer is expanded to form two or more outer tube inner spaces between the adjacent expansion / contraction packers, and the injected liquid is injected from the inner tube discharge port through the outer tube inner space and the outer tube discharge port. Simultaneously injecting into the ground, then discharging the fluid from the expansion / contraction packer, contracting the expansion / contraction packer, moving multiple inner pipes and injecting the inner pipe outlet to each other outer pipe outlet After moving the stage, the expansion / contraction packer is expanded to form the outer tube inner space. The injection solution, characterized in that it co-injected into the ground returns Ri.

The present invention has three or more expansion / contraction packers at different positions in the longitudinal direction, and an inner tube having an inner tube discharge port is loosely inserted between these expansion / contraction packers and the fluid is sent to the expansion / contraction packer. Two or more outer tube inner spaces are formed between the expansion and contraction packers adjacent to each other, and an injection solution is simultaneously injected from the inner tube discharge port into the ground through the outer tube inner space and the outer tube discharge port. Further, the fluid is discharged from the expansion / contraction packer and contracted. In this state, the inner tube is moved to another injection stage, and then the expansion / contraction packer is expanded, and the injection solution is repeatedly injected in the same manner. Therefore, even if the packer is long, the inner tube can be moved up and down by removing the fluid from the packer and reducing it. In addition, while a part of the outer tube discharge port is closed by the expansion / contraction packer, injection can be performed from another discharge port, and composite injection in which instantaneous setting grout and permeable grout are overlapped is possible.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view for explaining the steps of the ground injection method of the present invention. FIG. 2 is a cross-sectional view of a state where the fluid is discharged from the expansion / contraction packer and the inner tube is moved to another injection stage. FIG. 3 is a cross-sectional view of a state where the expansion / contraction packer of FIG. 2 is expanded and injection is performed from another injection stage. FIG. 4 is a cross-sectional view showing a state in which a plurality of inner pipes are used. FIG. 5 is a cross-sectional view of a state in which a fluid is discharged from the expansion / contraction packer of FIG. 4 and a plurality of inner tubes are moved to another injection stage. FIG. 6 is a cross-sectional view of a state where the expansion / contraction packer of FIG. 5 is expanded and injection is performed from another injection stage. FIG. 7 is a cross-sectional view of a state in which an expansion / contraction packer is further provided in the outer tube inner space. FIG. 8 is a cross-sectional view of a state in which a fluid is discharged from the expansion / contraction packer of FIG. 7 and a plurality of inner tubes are moved to another injection stage. FIG. 9 is a cross-sectional view of a state where the expansion / contraction packer of FIG. 8 is expanded and injection is performed from another injection stage. FIG. 10 is a sectional view of an injection tube actually used. FIG. 11 is a cross-sectional view of a known injection tube.

  As shown in FIG. 1, according to the present invention, first, an outer tube 3 having a plurality of outer tube discharge ports 2, 2,. Although not shown, the outer tube 3 is installed on the ground 1 by forming a hole in the ground 1 and inserting the outer tube 3 into the hole. The outer tube discharge ports 2, 2... 2 are each covered with a rubber sleeve 4.

  Next, the inner tube 5 is loosely inserted into the outer tube 3. The inner pipe 5 has three or more expansion / contraction packers 6, 6,... 6 at different positions in the outer longitudinal direction, and an inner pipe comprising an injection port between the expansion / contraction packers 6, 6 adjacent to each other. It has a discharge port 7.

  In the present invention, a fluid such as air or water is sent to three or more expansion / contraction packers 6, 6, 6 through a packer passage 8 communicated with the expansion / contraction packers 6, 6, 6. Inflate 6, 6,. As a result, two or more outer tube inner spaces 9, 9,... 9 are formed between the expansion / contraction packers 6 and 6 adjacent to each other, and injected liquid is injected from the inner tube discharge port 7 into the outer tube inner space 9 and the outer tube discharge port 2. Then, it is simultaneously injected into the ground 1 to form consolidated regions 10, 10,. At this time, the discharge ports other than the outer tube discharge port 2 existing between the expansion / contraction packers 6 and 6 adjacent to each other are closed by the expansion / contraction packer 6.

  Next, as shown in FIG. 2, the fluid is discharged from the expansion / contraction packers 6, 6,... 6 to contract the expansion / contraction packers 6, 6,. In this way, the inner tube 5 is moved upward so that the inner tube discharge port 7 is matched with the other outer tube discharge port 2, and the injection stage is moved. That is, after the inner tube 5 is moved to a position where the position of the inner tube discharge port 7 coincides with the outer tube discharge port 2 closed by the expansion / contraction packers 6, 6,. In this manner, the expansion / contraction packers 6, 6,... 6 are expanded to form outer tube inner spaces 9, 9,... 9 and repeatedly injected simultaneously into the ground 1 in the same manner as in FIG. 10 are overlapped.

  In the above-described present invention, by using a quick setting grout as the injection solution in FIG. 1 and using an osmotic grout as the injection solution in FIG. 3, complex injection is possible. That is, in FIG. By injecting the instantaneous setting grout and then moving the injection stage and injecting the permeable grout having a long setting time in FIG. 3, the combined injection becomes possible.

  FIG. 4 is a cross-sectional view of an example in which a plurality of inner tubes 5 are used. As shown in FIG. 4, as in FIG. 1, an outer tube 3 having a plurality of outer tube discharge ports 2, 2... 2 is installed in the ground 1 at different positions in the axial direction. A plurality of inner pipes 7, 7,. The plurality of inner tubes 7, 7,... 7 have three or more expansion / contraction packers 6, 6,... 6 at different positions in the longitudinal direction as in FIG. Each of the inner pipe discharge ports 7, 7,... Then, as shown in FIG. 4, the fluid is sent to three or more expansion / contraction packers 6, 6, 6 to be expanded so that two or more outer tube inner spaces 9, 9. 9 is formed, and the injection solution is simultaneously injected from the inner tube discharge port 7 into the ground through the outer tube inner space 9 and the outer tube discharge port 2 to form the consolidated region 10.

  Next, as shown in FIG. 5, the fluid is discharged from the expansion / contraction packers 6, 6,. Thereafter, the plurality of inner tubes 5, 5,... 5 are moved upward so that the inner tube discharge port 7 is moved to the other outer tube discharge port and the injection stage is moved, as shown in FIG. Then, the expansion / contraction packers 6, 6,... 6 are expanded to form the outer tube inner space 9, and the injection solution is repeatedly injected into the ground 1 in the same manner, and the consolidated regions are overlapped.

  FIG. 7 is a cross-sectional view of an example in which an in-space expansion / contraction packer 11 is further provided in the outer tube inner space 9 of FIG. As shown in FIG. 7, as in FIG. 1 or in the same manner as in FIG. 4, an outer tube 3 having a plurality of outer tube discharge ports 2, 2,. A plurality of inner tubes 7, 7... 7 are loosely inserted into the outer tube 3. The plurality of inner tubes 7, 7,... 7 have three or more expansion / contraction packers 6, 6,... 6 at different positions in the longitudinal direction, and the spaces 12, 12 divided by the space expansion / contraction packers 11 In each case, one inner pipe discharge port 7 is arranged. The inner tube discharge port does not necessarily have to be an injection port, and can also be a pore.

  Then, as shown in FIG. 7, the fluid is sent to three or more expansion / contraction packers 6, 6... 6 and the in-space expansion / contraction packer 11 to expand the expansion / contraction packer 6 and the in-space expansion / contraction packer 11. The injection solution is simultaneously injected into the ground 1 through the divided space 12 and the outer tube discharge port 2 from the inner tube discharge port 7 of the space 12 separated from each other, thereby forming a consolidated region 10.

  Next, as shown in FIG. 8, fluid is removed from the expansion / contraction packers 6, 6,... Thereafter, the plurality of inner tubes 5, 5,... 5 are moved upward, the inner tube discharge port 7 is moved to the other outer tube discharge port and the injection stage is moved, as shown in FIG. The expansion / contraction packers 6, 6... 6 and the in-space expansion / contraction packer 11 are expanded to form a partitioned space 12. Similarly, the injection solution is repeatedly injected simultaneously into the ground 1, and the consolidated region 10 is formed. Overlapping to form.

  In FIG. 4, a packer flow path 8 connected to the expansion / contraction packer 6 is further loosely inserted into the outer tube 3, and a fluid is sent to the expansion / contraction packer 6 through the packer flow path 8 to expand the packer. Alternatively, the fluid is discharged from the expansion / contraction packer 6 to contract the packer. Further, in FIG. 7, the packer flow path 8 communicated with the expansion / contraction packer 6 and the space expansion / contraction packer 11 is loosely inserted into the outer tube 3, and the expansion / contraction packer 6 and the space expansion / contraction packer 11 are passed through the packer flow path 8. Fluid is sent to expand the packer, or fluid is discharged from the packers 6 and 11 to contract the packer.

  FIG. 10 is a cross-sectional view showing an actual injection pipe actually used in the field, and the method of the present invention is carried out using this injection pipe. In particular, the tip 16 of the inner tube 5 is connected by a flexible member 13 such as a rubber tube. Further, the injection liquid (A liquid, B liquid) is used as an injection liquid flow path of the inner pipe 5 from the injection liquid tank 15 through the pump P, the pressure gauge P, and the flow meter F using an automatically controlled injection liquid delivery device (not shown). The liquid A and the liquid B are respectively ejected from the separate inner tube discharge ports 7 and 7 and injected into the ground 1 from the outer tube discharge port through the outer tube inner space 9. Next, the inner pipe 5 is moved upward and injected into the ground 1 as described above.

  In the present invention, the expansion and contraction of the packer can be freely performed by using the expansion and contraction packer as the packer. Therefore, by extending the packer and expanding it, a part of the outer tube discharge port can be closed and contracted. In this way, the inner tube can be moved up and down in the outer tube, and more than two expansion / contraction packers can be simultaneously injected from two or more outer tube discharge ports. Combined injection with superposed grout and permeable grout is possible, and it is highly useful in the field of ground injection.

It is sectional drawing for demonstrating the process of this invention ground injection construction method. It is sectional drawing of the state which discharged | emitted the fluid from the expansion / contraction packer and moved the inner pipe | tube to the other injection | pouring stage. It is sectional drawing of the state which expanded the expansion / contraction packer of FIG. 2, and inject | poured from another injection | pouring stage. It is sectional drawing showing the state which used multiple inner pipes. FIG. 5 is a cross-sectional view of a state in which fluid is discharged from the expansion / contraction packer of FIG. 4 and a plurality of inner tubes are moved to another injection stage. It is sectional drawing of the state which expanded the expansion / contraction packer of FIG. 5, and inject | poured from another injection | pouring stage. It is sectional drawing of the state which further provided the expansion / contraction packer in the outer pipe | tube inner space. It is sectional drawing of the state which discharged | emitted the fluid from the expansion / contraction packer of FIG. 7, and moved several inner pipe | tubes to the other injection | pouring stage. It is sectional drawing of the state which expanded the expansion / contraction packer of FIG. 8, and inject | poured from another injection | pouring stage. It is sectional drawing of the injection tube actually used. It is sectional drawing of a well-known injection tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Outer tube discharge port 3 Outer tube 5 Inner tube 6 Expansion / contraction packer 7 Inner tube discharge port 8 Packer flow path 9 Outer tube inner space 10 Consolidation region 11 Intra-expansion / contraction packer 12 Delimited space

Claims (21)

  An outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and there are three or more expansion / contraction packers at different positions in the longitudinal direction, and adjacent to each other. An inner tube having an inner tube discharge port is loosely inserted between the expansion / contraction packs to be sent, a fluid is sent to the three or more expansion / contraction packers, the expansion / contraction packers are expanded, and two or more expansion / contraction packers are adjacent to each other. A ground injection method characterized by forming an outer pipe inner space and injecting an injection solution from the inner pipe outlet into the ground through the outer pipe inner space and the outer pipe outlet.   An outer pipe having a plurality of outer pipe discharge ports is installed in the ground at different positions in the axial direction, and there are three or more expansion / contraction packers at different positions in the longitudinal direction, and adjacent to each other. An inner tube having an inner tube discharge port is loosely inserted between the expansion / contraction packs to be sent, a fluid is sent to the three or more expansion / contraction packers, the expansion / contraction packers are expanded, and two or more expansion / contraction packers are adjacent to each other. Forming the outer pipe inner space, and simultaneously injecting the injection liquid from the inner pipe outlet through the outer pipe inner space and the outer pipe outlet to the ground, and then discharging the fluid from the expansion / contraction packer to contract the expansion / contraction packer, Move the inner tube to match the inner tube discharge port with the other outer tube discharge port, move the injection stage, expand the expansion / contraction packer to form the inner space of the outer tube, and repeat the injection solution repeatedly in the same way Ground injection method characterized by injecting into the ground.   The ground injection method according to claim 1 or 2, wherein the inner pipe discharge port is an injection port.   3. The inner tube according to claim 1, wherein the inner tube includes a packer flow passage communicated with the expansion / contraction packer, and a fluid is sent to the expansion / contraction packer to expand the packer, or the fluid is discharged from the expansion / contraction packer. Alternatively, the ground injection method according to claim 1 or 2, wherein the packer is contracted by reducing the fluid pressure in the packer.   The ground injection method according to claim 4, wherein the fluid is gas or water.   3. When a grout having different permeability is used in combination, firstly, the grout having the lower permeability is injected as the injection liquid, and then the grout having the better permeability is injected by moving the injection stage. The ground injection construction method according to claim 1 or 2.   In the ground, an outer pipe having a plurality of outer pipe discharge ports is installed at different positions in the axial direction, and there are three or more expansion / contraction packers at different positions in the longitudinal direction. A plurality of inner pipes, each having an inner pipe discharge port positioned separately, are inserted between the contraction packers and fluids are sent to the three or more expansion / contraction packers to inflate the expansion / contraction packers so that they are adjacent to each other. A ground injection method characterized in that two or more outer pipe inner spaces are formed between packers, and an injection solution is injected from the inner pipe outlet into the ground through the outer pipe inner space and the outer pipe outlet.   In the ground, an outer pipe having a plurality of outer pipe discharge ports is installed at different positions in the axial direction, and there are three or more expansion / contraction packers at different positions in the longitudinal direction. Between the contraction packers, a plurality of inner pipes each having an inner pipe discharge port positioned separately are loosely inserted, and fluid is sent to the three or more expansion / contraction packers to inflate the expansion / contraction packers. Two or more outer pipe inner spaces are formed between the packers, and the injection solution is simultaneously injected from the inner pipe discharge port into the ground via the outer tube inner space and the outer tube discharge port. Shrink packer, move multiple inner pipes, align inner pipe discharge port with other outer pipe discharge port and move injection stage, then expand and contract packer to form outer pipe inner space In the same way, the ground injection is characterized by repeatedly injecting the liquid into the ground. Law.   The ground injection method according to claim 1 or 2, wherein the inner pipe discharge port is an injection port.   In Claim 7 or 8, the packer flow path communicated with the expansion / contraction packer is further loosely inserted into the outer tube, and fluid is sent to the expansion / contraction packer through the packer flow path to expand the packer, or the expansion / contraction The ground injection method according to claim 7 or 8, wherein fluid is discharged from the packer, or the packer is contracted by reducing the fluid pressure in the packer.   The ground injection method according to claim 10, wherein the fluid is gas or water.   9. In the case of using grout with different permeability in combination with claim 7 or 8, as an infusion, firstly grout with poor permeability is injected, and then the stage is moved to inject grout with better permeability. The ground injection construction method according to claim 7 or 8.   9. The inner tube discharge space according to claim 7 or 8, further comprising an in-space expansion / contraction packer in the outer tube inner space, wherein one inner tube discharge port is disposed in each space partitioned by the in-space expansion / contraction packer. Or the ground injection construction method of 8.   The ground injection method according to claim 13, wherein the inner pipe discharge port arranged in the space delimited by the expansion / contraction packer in the space is a pore.   14. The in-space expansion / contraction packer is connected to a packer flow path, and fluid is sent to the internal expansion / contraction packer through the packer flow path to expand the packer, or the fluid is discharged from the expansion / contraction packer in the space. Alternatively, the ground injection method according to claim 13, wherein the packer is contracted by reducing the fluid pressure in the packer.   16. The ground injection construction method according to claim 4, 10 or 15, wherein the inner pipe is provided with a depressurization device, and the inner pipe injection liquid is depressurized as the expansion / contraction packer contracts.   9. The expansion / contraction packer according to claim 1, wherein the expansion / contraction packer is an elastic, water-impermeable cylindrical bag body that expands until it comes into close contact with the inner wall of the outer tube by the internal pressure of the fluid in the packer. The ground injection method according to claim 1, 2, 7, or 8, wherein the ground pipe contracts by lowering the pressure of the inner pipe so that the inner pipe can move within the outer pipe.   The ground injection construction method according to claim 1, 2, 7 or 8, wherein the inner pipe is connected by a flexible joint.   9. The method according to claim 1, wherein an electric earth pressure gauge, a strain gauge or a pore water pressure gauge is installed on the tube wall near the discharge port to measure the injection pressure at the time of injection. The ground injection method according to 2, 7, or 8.   20. The ground injection method according to claim 19, wherein the injection pressure information is collected on the ground by wire or wireless and used for injection control. 9. The ground injection according to claim 1, 2, 7 or 8, wherein a flow rate measuring sensor is provided at the inner pipe outlet to measure the injection speed and the injection amount at the time of injection. Construction method.

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