JP2012158958A - Removal type liquid chemical injection pipe and ultra multipoint simultaneous injection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a narrow pipe for injection after liquid chemical is injected from being left underground.SOLUTION: An ultra multipoint simultaneous injection method includes: a step of drilling a hole to a prescribed depth while sending water in a casing by using a drilling machine; a step of filling the inside of the casing with a sealant after drilling a hole to the prescribed depth; a step of inserting, into the casing filled with the sealant, a removal type liquid chemical injection pipe for which a sealant cutting and destroying implement with a pull-up core material installed is fixed to the center part of an injection bound narrow pipe for which a plurality of injection narrow pipes are bound and on the distal end side of the plurality of injection narrow pipes, and pulling out the casing; a step of injecting a liquid chemical for ground improvement from the injection narrow pipes of the removal type liquid chemical injection pipe; a step of cutting the solidified sealant by the sealant cutting and destroying implement while pulling out the pull-up core material after the injection of the liquid chemical for ground improvement is completed; and a step of pulling out the injection narrow pipe while discharging the sealant from a tip nozzle of the injection narrow pipe after the pull-up core material is pulled out.

Description

The present invention relates to a removable chemical liquid injection pipe capable of removing an injection thin tube after chemical liquid injection from the soil and a super multi-point simultaneous injection method using the removable chemical liquid injection pipe.
The present invention relates to a ground improvement (solidification) method, in particular, for the purpose of reducing the water permeability of the ground or increasing the strength of the ground, a chemical solution (injection material; suspension type cement system, solution type water glass system) -This technology relates to a technology for injecting polymer or special silica) into a predetermined location in the ground through a thin tube.

With the improvement of chemicals (injection material) (securing long-term durability and durability), examples of ground improvement methods that can be applied to liquefaction countermeasures and reinforcement of the foundation ground are increasing. The chemical injection method that can be constructed while sharing existing confined spaces and facilities is considered one of the methods that can greatly contribute to the maintenance and repair of existing social capital.
Recently, "super multi-point simultaneous injection method" (for example, refer to Patent Documents 1, 2, 3, and 4) that can suppress ground displacement during chemical solution injection construction has been developed. Construction examples are increasing in areas such as reinforcement work for existing tanks and liquefaction countermeasures for existing tank foundation ground.

An example is shown in FIG.
First stroke For example, a rotary percussion type drilling machine is used to drill holes in the ground 100 to a predetermined depth while feeding water with a casing 101 of about φ95 mm.
Second stroke After drilling to a predetermined depth, the casing 101 is filled with a gel-like sealing material 102 that is not solidified.

Third Step The injection thin tube 103 is inserted into the casing 101 filled with the sealing material 102, and the casing 101 is pulled out.
Fourth stroke A water injection test is performed in which water 104 is injected into the ground from the injection thin tube 103.

5th process The chemical | medical solution 105 for ground improvement is inject | poured from the thin tube 103 for injection | pouring.
Sixth step The injection of the chemical solution 105 for improving the ground of the injection thin tube 103 is completed. The injection capillary 103 is left in the ground.
This completes the construction.

Japanese Patent No. 2555253 Japanese Patent No. 2852721 Japanese Patent No. 3724644 Japanese Patent No. 3762353

However, the chemical injection is a method of injecting a drug through a thin tube (injection thin tube 103) installed in the ground, for example, as shown in FIG. 16, and the thin tube remains permanently in the ground. .
Moreover, as the construction range of the injection increases, the number of thin tubes (injection thin tubes 103) existing in the ground increases.
Normally, a thin tube for injection (injection thin tube 103) is installed in the ground at about 1 / 1m ² to 1 / 4m ² .

In the standard double tube double packer method used in the chemical solution injection method, a large number of PVC pipes (injection narrow tubes 103) having a diameter of about 50 to 100 mm are left in the ground.
The same applies to the super multi-point simultaneous injection method, which uses a narrower tube (injection tube 103) than the double tube double packer method, but there are still many injection tubes (PVC pipes and vinyl pipes) in the ground. Will be left behind.
When a large number of injection thin tubes (injection thin tubes 103) are left in the ground, it becomes an obstacle when newly excavating the injection target ground or performing earth retaining work or piping. In particular, in small-diameter propulsion work (sewage / water supply, communication piping) and shield work, an injection thin tube wraps around an auger of an excavator, which becomes a major obstacle. Further, since excavated sediment cannot be treated as general residual soil as it is, it is necessary to separate the injection thin tube from the sediment.

In the chemical solution injection method, it has become a big problem that an indispensable injection tube (injection tube 103) is left in the ground. In particular, in connection with maintenance and renewal and repair of existing social capital development, construction work on the ground around existing structures (the chemical injection method has already been implemented) has been increasing, and the remaining injection capillaries (for injection) Removal and processing of capillaries 103) has become a major problem.
In particular, when a high ground improvement effect is expected, it is common to use a method of injecting a chemical solution from an injection capillary (injection capillary 103) installed in the ground. The material of the injection tube (injection tube 103) used for the super-multi-point simultaneous injection method is polyethylene or the like, and the degradation rate in the natural state is very slow, and it remains permanently after being left in the soil after injection. This is an environmental problem.

  The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a removable chemical solution injection tube capable of removing the injection thin tube from the soil after the chemical solution injection and the removal thereof. It is to provide a super multi-point simultaneous injection method using a chemical liquid injection pipe.

According to the first aspect of the present invention, the sealing material cutting breaker provided with the lifting core is fixed to the central portion of the bundling tubule for bundling a plurality of tubules for injection and to the tip side of the plurality of tubules for injection. It is characterized by that.
The invention according to claim 2 is the removal-type chemical solution injection tube according to claim 1, wherein the seal material cutting breaker has a tip at the tip thereof so that it can be easily built and inserted. It is characterized by having a bell-shaped cap that can reduce the insertion resistance at the time of installation.

According to a third aspect of the present invention, in the removable chemical liquid injection tube according to the first aspect, the sealing material cutting breaker is arranged in multiple stages.
According to a fourth aspect of the present invention, in the removable chemical liquid injection tube according to the third aspect, the outer diameter of the sealing material cutting breaker disposed at the upper stage is smaller than the outer diameter of the cutting breaker disposed at the lower stage. It is characterized by that.

  The invention according to claim 5 is a process of drilling to a predetermined depth while supplying water with a casing using a drilling machine, and a process of filling the casing with a sealing material after drilling to a predetermined depth. 5. A process of inserting the removable chemical liquid injection pipe according to claim 1 into the casing filled with the sealing material, and pulling out the casing; and injection of the removable chemical liquid injection pipe A step of injecting a chemical solution for ground improvement from a thin capillary tube, a step of cutting the sealing material solidified while pulling out the lifting core material after completion of the injection of the chemical solution for ground improvement, and the lifting method And a step of pulling out the injection thin tube while discharging the sealing material from the most advanced nozzle of the injection thin tube after the core material is pulled out.

ADVANTAGE OF THE INVENTION According to this invention, the thin capillary for injection | pouring which becomes a hindrance even when it newly constructs in the ground where the chemical | medical solution injection construction method was constructed, and its vicinity can be removed reliably.
According to the present invention, since an artificial object such as a thin capillary for injection does not remain in the soil, it is possible to provide a construction method in which the removal cost is not reduced from the asset value in a private land.

1 is a side view showing a removal type chemical liquid injection tube 1 according to a first embodiment of the present invention. It is sectional drawing along the AA line of FIG. It is a side view which shows the sealing material cutting destruction tool 10 used for 1st embodiment of FIG. It is a side view which shows the sealing material cutting destruction tool main body 11 in FIG. It is sectional drawing along the BB line of FIG. It is a side view which shows the front end cap 18 in FIG. It is sectional drawing along CC line of FIG. It is a side view which shows the wedge 17 in FIG. FIG. 9 is an end view of the wedge 17 in FIG. 8. It is a side view which shows the spring 17d in FIG. It is a figure explaining the construction procedure of the super multi-point injection method using the removal type chemical | medical solution injection pipe | tube 1 which concerns on 1st embodiment shown in FIG. It is a side view which shows 1 A of pipes for removal type chemical | medical solution injection which concern on 2nd embodiment of this invention. It is sectional drawing along the DD line of FIG. It is a side view which shows the sealing material cutting destructive tool 10B used for 2nd embodiment shown in FIG. It is a figure explaining the construction procedure of the super multi-point injection construction method using 1A of removal-type chemical | medical solution injection pipes which concern on 2nd embodiment shown in FIG. It is a figure explaining the construction procedure of the conventional super multi-point injection construction method.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[First embodiment]
FIG. 1 thru | or FIG. 10 shows the removal type chemical | medical solution injection tube 1 which concerns on 1st embodiment of this invention.
The removal type chemical liquid injection tube 1 according to the present embodiment includes, for example, as shown in FIGS. 1 to 5, a sealing material cutting breaker provided with a lifting core material 25 made of a steel wire having a diameter of about 12.7 mm, for example. 10 and a bundling tube 30 for injection in which a plurality of injection tubes 31 having a length of 10 m or less are bundled, and the sealing material cutting breaker 10 is arranged at the center of the bundling tube 30 for injection, and the tip (hole It is configured by fixing to the injection tube 31 on the bottom) side with a binding body 33.

As shown in FIG. 3, for example, the sealing material cutting / breaking tool 10 includes a sealing material cutting / breaking tool main body 11, a split or split wedge 17, and a bell-shaped (conical) tip cap 18. .
As shown in FIGS. 3 to 5, for example, the sealing material cutting breaker main body 11 includes a conical portion 12 provided with six (usually six or eight) cutting blades 13 in a star shape on the outer periphery, Six pieces (usually six pieces) that are integrally connected to the large diameter side of the conical portion 12 and are integrally connected to the six cutting blades 13 provided in a star shape on the outer periphery of the conical portion 12. Or a cylindrical portion 14 provided with eight cutting blades 15 on the outer periphery, and a through hole 16 provided in the central portion of the conical portion 12 and the cylindrical portion 14 in order to insert the lifting core 25 It has.

In addition, although this embodiment demonstrated the case where the six cutting blades 13 and 15 were provided in the star shape, this invention is not restricted to this. In the present invention, the number of the cutting blades 13 and 15 can be achieved usually by about six or eight, but eight or more may be provided.
The sealing material cutting breaker main body 11 can cut the sealing material 52 solidified by, for example, the star-shaped cutting blades 13 and 15 into a wedge shape by lifting with the lifting core material 25. The uniaxial compressive strength qu = 100 to 300 kN / m ² ; the mechanical strength of about 1 to 3 kgf / cm ² or more is required. Therefore, it is desirable that the sealing material cutting breaker main body 11 is made of a metal material, but may be made of a hard resin such as hard polyethylene.

The through hole 16 has an insertion hole 16a of the same diameter provided from the small diameter end 12a side to the large diameter end 12b side of the conical portion 12, and the open end 14a of the cylindrical portion 14 connected to the insertion hole 16a. A wedge mounting hole 16b provided so as to expand in a tapered shape, and a tip cap mounting hole provided at the same diameter toward the open end 14a of the tubular portion 14 connected to the large diameter end side of the wedge mounting hole 16b. 16c.
The insertion hole 16 a has a hole diameter slightly larger than the outer diameter of the lifting core 25 so that the lifting core 25 can be inserted.

The wedge mounting hole 16b faces the open end 14a of the tubular portion 14 so that the split or split wedge 17 can be mounted and the lifting core 25 can be restrained by the split or split wedge 17. The diameter is increased in a tapered shape.
The tip cap mounting hole 16c is used for screwing the tip cap 18 and the space 161 in which the wedge stopper 17b and the head 17c side of the split or three-piece wedge 17 are arranged on the boundary side with the wedge mounting hole 16b. And an internal thread portion 162.

The split or split wedge 17 is inserted into the through hole 16 from the open end side of the tubular portion 14 in order to restrain the lifting core 25 inserted through the through hole 16 in the through hole 16.
The split or split wedge 17 is provided with a spring clamp 17b, and the spring 17d is attached to the spring clamp 17b with each wedge piece 17a assembled into a split or split wedge 17. It is configured to be assembled by. In the through hole 16, a force for spreading the split or split wedge 17 is exerted so that the wedge effect of the wedge pieces 17 a on the lifting core 25 can be exerted to restrain the lifting core 25. When hung, the respective wedge pieces 17a can be made to spread evenly by the springs 17d attached to the spring clamps 17b. At the same time, when the wedge pieces 17a are spread, the springs 17d attached to the spring clasps 17b are regulated so as not to be displaced from each other.

A bell-shaped tip cap 18 covers the tip of the lifting core 25 and presses the split or split wedge 17 to exert the restraining force of the split or split wedge 17; and In order to reduce the insertion resistance of the sealing material cutting / breaking tool 10 and to reduce the insertion resistance and to facilitate the insertion, a screw is inserted into the through hole 16 from the open end 14a side of the cylindrical portion 14 of the sealing material cutting / breaking tool body 11. Worn.
A bell-shaped tip cap 18 has a male threaded portion 18b on the outer periphery and a cylindrical portion 18a provided with a wedge holding portion 18c on the opening end side, and a bell (conical) provided on the distal end side of the cylindrical portion 18a. 18d, and a hole 18e that covers the tip of the lifting core 25 provided from the wedge retainer 18c of the cylindrical portion 18a toward the bell-shaped portion 18d. A hexagonal bolt-shaped rotating portion 18f is provided at the boundary between the cylindrical portion 18a and the bell-shaped portion 18d in order to rotate the bell-shaped tip cap 18.

For example, as shown in FIG. 11, when the sealing material cutting breaker 10 and the bundling capillaries 30 for injection are built in a casing 51 filled with a sealing material (non-solidified gel) 52, buoyancy, etc. There is a possibility that the injection thin tube 31 is twisted by the influence of the above. In the state where the injection capillary 31 is twisted, there is no hindrance to the chemical injection, but when the sealing material cutting breaker 10 is lifted, the possibility of cutting the injection capillary 31 is increased, and the injection capillary 31 is completely removed. It cannot be removed.
For this reason, by installing the bell-shaped tip cap 18 having a weight that opposes the assumed buoyancy at the tip of the sealing material cutting breaker main body 11, the injection capillary 31 is not twisted and the efficiency is improved. Can be built in.

An injection capillary 31 is arranged around the sealing material cutting breaker 10 (star-shaped recess), and is a bundle 33 made of a relatively low-strength adhesive or a material that can be easily broken, for example, bean tape. The sealing material cutting breaker 10, the tensile core material 25, and the injection bundling capillary 30 are integrated, and then installed in the injection hole (in the casing 51 filled with the sealing material 52).
The injecting bundling capillaries 30 are composed of, for example, a plurality of injecting capillaries 31 having a diameter of about 50 to 100 mm and made of vinyl pipes or vinyl pipes of 10 m or less.

Next, based on FIG. 11, the construction procedure of the super multi-point injection method using the removal-type chemical solution injection pipe 1 according to the first embodiment of the present invention will be described.
First stroke For example, a rotary percussion type drilling machine is used to drill holes in the ground 50 to a predetermined depth while feeding water with a casing 51 of about φ95 mm.

Second stroke After drilling to a predetermined depth, the casing 51 is filled with an unsolidified gel-like sealing material 52.
The uniaxial compressive strength of the solidified sealing material 52 is about cu = 100 to 300 kN / m ² ; about 1 to 3 kgf / cm ² .

Third Step The removable chemical liquid injection pipe 1 provided with the sealing material cutting breaker 10 is inserted into the casing 51 filled with the sealing material 52, and the casing 51 is pulled out.
Fourth Step A chemical solution 53 for ground improvement is injected from the injection thin tube 31. By injecting the chemical solution 53 for ground improvement, a solidified layer of the chemical solution 53 for ground improvement is formed in the soil around the hole cut by the casing 51.

Fifth step After the completion of the injection of the chemical solution 53 for ground improvement, the center hole type hydraulic jack installed on the ground is applied to the lifting core member 25 equipped with the sealing material cutting breaker 10 to operate the center hole type hydraulic jack. By pulling up the lifting core material 25, the sealing material 52 solidified by the cutting blades 13 and 15 of the sealing material cutting breaker 10 is pulled out while cutting.
As a result, innumerable cuts are formed in the solidified sealing material 52 along the trajectory of the sealing material cutting / breaking tool 10 in the vertical direction, and the adhesion of the solidified sealing material 52 to the injection thin tube 31 is significantly reduced. be able to.

Sixth Step After the lifting core 25 is pulled out, the injection thin tube 31 is pulled out while discharging the sealing material 52 from the most advanced nozzle of the injection thin tube 31. At this time, each of the injection capillaries 31 is in a state where it can be easily peeled off from the sealing material 52 solidified in the fifth stroke.

As described above, according to the present embodiment, it is possible to reliably remove the injection narrow tube 31 that becomes an obstacle even when a new work is performed on the ground 50 where the chemical solution injection method is applied or in the vicinity thereof.
Moreover, according to this embodiment, since the artificial object like the injection | pouring thin tube 31 does not remain in the ground 50, the construction method by which removal cost is not reduced from an asset value in a private land can be provided.

[Second Embodiment]
12 to 14 show a removable chemical liquid injection tube 1A according to the second embodiment of the present invention.
This embodiment is applied when the length of the injection capillary 31 exceeds 10 m. In this embodiment, the removal type chemical | medical solution injection pipe | tube 1A which has arrange | positioned the sealing material cutting destructive tool 10 in two steps is shown.

When the sealing material cutting breaker 10 is installed in multiple stages, the outer diameter of the sealing material cutting breaker 10B arranged in the upper stage is smaller than the outer diameter of the sealing material cutting breaker 10A arranged in the lower stage.
When the injection thin tube 31 is long (exceeding 10 m), the frictional resistance of the lifting core 25 increases due to the influence of the restraint pressure of the natural ground, and the cutting efficiency is assumed to be reduced. Further, since the contact area between the injection thin tube 31 and the sealing material 52 also increases, the lifting resistance of the injection thin tube 31 increases, and the possibility of the injection thin tube 31 breaking increases.

For this reason, the sealing material cutting breaker 10B having an outer diameter smaller than that of the sealing material cutting breaker 10A at the tip is provided in the intermediate portion, and the number of cutting locations of the sealing material 52 is increased, thereby It is necessary to reduce the friction (lifting) resistance. The outer diameter of the sealing material cutting breaker 10B installed at the intermediate part is thinner than the outer diameter of the sealing material cutting breaker 10A installed at the tip part by the outer diameter (φ12.7 mm) of the lifting core 25. It is as a diameter.
The intermediate sealing material cutting breaker 10B and the distal end sealing material cutting breaker 10A can efficiently cut the sealing material 52 and reduce the adhesion resistance between the injection thin tube 31 and the sealing material 52. There is a difference in the outer diameter between the sealing material cutting breaker 10A and the intermediate sealing material cutting breaker 10B.

Further, in the sealing material cutting / breaking tool 10B at the intermediate portion, the hole portion 18e of the tip cap 18A is configured as a through hole so that the lifting core member 25 can be inserted, and the bell-shaped portion 18d is formed as a hole. It has a truncated cone shape cut along the opening end of the portion 18e.
In the present embodiment, as shown in FIG. 13, the case where six injection thin tubes 31 are used has been described. However, the present invention is not limited to this, and the cutting blade 13 provided in the sealing material cutting breaker main body 11, It can be arbitrarily adjusted by increasing or decreasing the number of 15 sheets.
The other structure is comprised similarly to the sealing material cutting destructive tool 10 shown in 1st embodiment.

Next, the construction procedure of the super multi-point injection method using the removal type chemical solution injection pipe 1A according to the second embodiment of the present invention will be described based on FIG.
First stroke For example, a rotary percussion type drilling machine is used to drill holes in the ground 50 to a predetermined depth while feeding water with a casing 51 of about φ95 mm.

Second stroke After drilling to a predetermined depth, the casing 51 is filled with an unsolidified gel-like sealing material 52.
The uniaxial compressive strength of the solidified sealing material 52 is about cu = 100 to 300 kN / m ² ; about 1 to 3 kgf / cm ² .

Third Step The removable chemical liquid injection pipe 1A provided with the sealing material cutting breakers 10A and 10B is inserted into the casing 51 filled with the sealing material 52, and the casing 51 is pulled out.
Fourth Step A chemical solution 53 for ground improvement is injected from the injection thin tube 31. By injecting the chemical solution 53 for ground improvement, a solidified layer of the chemical solution 53 for ground improvement is formed in the soil around the hole cut by the casing 51.

5th stroke After the completion of the injection of the chemical solution 53 for ground improvement, the center hole type hydraulic jack installed on the ground is applied to the lifting core member 25 equipped with the sealing material cutting breakers 10A and 10B, and the center hole type hydraulic jack is attached. By operating and pulling up the lifting core material 25, the sealing material 52 solidified by the cutting blades 13 and 15 of the sealing material cutting breakers 10A and 10B is pulled out while being cut.
As a result, the solidified sealing material 52 has innumerable cuts in the vertical direction along the trajectories of the sealing material cutting breakers 10A and 10B, and the adhesive force of the solidified sealing material 52 to the injection thin tube 31 is remarkably increased. Reduce.

Sixth Step After the lifting core 25 is pulled out, the injection thin tube 31 is pulled out while discharging the sealing material 52 from the most advanced nozzle of the injection thin tube 31. At this time, each of the injection capillaries 31 is in a state where it can be easily peeled off from the sealing material 52 solidified in the fifth stroke.

  As described above, according to the present embodiment, even when the length of the injection thin tube 31 exceeds 10 m, the core material for lifting of the removable chemical liquid injection tube 1A including the sealing material cutting breakers 10A and 10B is provided. 25, the solidified sealing material 52 is pulled out while being surely cut to destroy the adhesion force of the sealing material 52 so that the injection thin tube 31 can be easily lifted, and then the sealing material 52 is removed from the injection thin tube 31. Therefore, it is possible to reliably perform refilling with the sealing material 52 simultaneously with the lifting of the injection thin tube 31. Therefore, it is possible to reliably remove the injection thin tube 31 that becomes an obstacle even when a new work is performed on the ground 50 where the chemical solution injection method is applied or in the vicinity thereof.

  Moreover, according to this embodiment, since the artificial object like the injection | pouring thin tube 31 does not remain in the ground 50, the construction method by which removal cost is not reduced from an asset value in a private land can be provided.

1,1A Removable chemical liquid injection tube 10, 10A, 10B Sealing material cutting destruction tool 11 Sealing material cutting destruction tool body 12 Conical part 13, 15 Cutting blade 14 Cylindrical part 16 Through hole 16a Insertion hole 16b Wedge mounting hole 16c Tip cap mounting hole 17 Split or split wedge 18, 18A Bell (cone) tip cap 25 Lifting core 30 Injection bundling thin tube 31 Injection thin tube 33 Bundling body 50 Ground 51 Casing 52 Sealing material 53 Ground improvement Chemicals for

Claims (5)

  A removal type characterized in that a sealing material cutting / disrupting tool provided with a lifting core material is fixed to the central portion of a bundling tubule for bundling a plurality of tubules for injection and to the tip side of the plurality of tubules for injection. Tube for chemical injection. In the removal type chemical injection tube according to claim 1,
A bell-shaped cap capable of reducing insertion resistance at the time of installation is installed at the tip of the sealing material cutting / breaking tool so as to facilitate the installation and insertion of the sealing material cutting / breaking tool. A removable chemical solution injection tube. In the removal type chemical injection tube according to claim 1,
A removal-type chemical solution injection tube, wherein the sealing material cutting breaker is arranged in multiple stages. In the removable chemical liquid injection tube according to claim 3,
The removal type chemical injection tube characterized in that an outer diameter of the sealing material cutting / disrupting tool disposed in the upper stage is smaller than an outer diameter of the cutting / disrupting tool disposed in the lower stage. Using a drilling machine, the process of drilling to a predetermined depth while feeding water in the casing,
A step of filling the casing with a sealing material after drilling to a predetermined depth;
A step of inserting the removable chemical injection pipe according to any one of claims 1 to 4 into the casing filled with the sealing material, and pulling out the casing.
A step of injecting a chemical solution for ground improvement from an injection thin tube of the removable chemical solution injection tube;
A step of cutting the sealing material solidified while pulling out the lifting core after the completion of the chemical improvement for the ground improvement by the sealing material cutting breaker;
A super multi-point simultaneous injection method comprising: a step of pulling out the injection thin tube while discharging a sealing material from the most advanced nozzle of the injection thin tube after the drawing core material is pulled out.

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