JP3177455B2 - Construction method of chemical injection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting a chemical solution, and more particularly to a method for injecting a chemical liquid into a ground after drilling the ground and then pouring the liquid into the ground from an inlet provided near the lower end of an injection rod built in the drilling hole. It belongs to the construction method of chemical liquid injection to inject materials and create consolidated soil and strengthen the ground.

[0002]

2. Description of the Related Art One of the ground improvement methods for improving the properties of the ground is a chemical liquid injection method. In the chemical injection method, an injection rod is inserted into the ground, and cement,
By injecting bentonite, water glass and other chemicals into the ground, solidified soil is created and the ground is strengthened.

[0003] In this type of chemical liquid injection method, except for the double pipe double packer method, the injection rod is generally inserted into the ground by drilling the target ground with the injection rod itself.

However, in the case where drilling by the injection rod itself is difficult because the hard ground such as a gravel layer is interposed in the target ground, conventionally, a tip opening bit such as a ring bit or a metal crown is provided at the tip. After drilling the ground with the casing pipe, installing the casing pipe in the ground, laying the injection rod in this casing pipe, and then pulling up the casing pipe while leaving the injection rod in the ground, The building method is adopted.

[0005]

However, the above prior art has the following problems.

[0006] When drilling holes in a casing pipe, an open-ended bit such as a ring bit or a metal crown is used, so that excavated soil is often clogged in the casing pipe during drilling, so-called core clogging. The casing pipe must be withdrawn once to remove the degree of excavation in the pipe. Therefore, it takes a lot of labor to lift the casing pipe and remove the excavated soil, and it takes a long time to drill holes in the casing pipe, which increases the construction cost.

[0007] The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of injecting a chemical solution, which can shorten the construction period, reduce the construction cost, and reduce the construction labor. On the point.

[0008]

The gist of the invention according to claim 1 is that after drilling the ground, the ground is solidified into the ground from an injection hole provided near the lower end of an injection rod built in the excavation hole. A method for injecting material to form consolidated soil and strengthen the ground, comprising: (1) an axially connected casing pipe provided with an outer bit at a tip thereof, and the casing pipe. The ground pipe is drilled in the ground by drilling the ground with the inner bit assembly inserted into the front end, the bite to be engaged is provided at the rear end, and the inner bit is attached to the front end so as not to fall off. (2) Inserting an inner bit lifting device having a bite portion at the front end capable of biting with the bite portion and having a rear end portion connected to a wire into the casing pipe; tip (3) elevating the inner bit assembly together with the inner bit by pulling out the wire, and (3) erecting the injection rod in the casing pipe. And (4) withdrawing the casing pipe while leaving the pouring rod; and (5) pouring a solidified material from the pouring port of the pouring rod to form consolidated soil, Top located at the tip of the casing pipe
Projection provided on a part of the casing (12) in the circumferential direction
(12a) can be opened and closed in the radial direction,
Cylindrical inner tube which forms the base of the print assembly (20)
Attached to the center of the probe (21), and on the opposite side in the radial direction
Located and radially outward by the latch spring (28)
Presses the side (27b) of the biased latch (27)
And rotating the inner bit assembly (20).
The inner bit drills the ground by the operation described above . The gist of the invention according to claim 2 is that after drilling the ground, a solidified material is injected into the ground from an injection hole provided near a lower end of an injection rod built in the excavation hole to consolidate the soil. A method for constructing and injecting a chemical solution for strengthening the ground, comprising: (1) an outer bit provided at a tip, a casing pipe connected in an axial direction, and a tip inserted in the tip of the casing pipe; Drilling the ground with an inner bit assembly having an occlusal portion provided at the rear end and an inner bit irremovably attached to the distal end and installing the casing pipe in the ground; An inner bit lifting device having an engaged bite portion at the front end, the rear end portion of which is connected to a wire, is inserted into the casing pipe, and the inner bit port at the front end of the casing pipe is inserted into the casing pipe. (3) retracting the inner bit assembly together with the inner bit by pulling out the wire, causing the bite portion of the assembly to bite into the bite portion, and (3) embedding the injection rod in the casing pipe; 4) a step of withdrawing the casing pipe with the injection rod remaining, and (5) a step of injecting solidification material from the injection port of the injection rod to form consolidated soil, and including a tip of the casing pipe.
In the circumferential direction of the top casing (12)
The provided protrusion (12a) can be freely opened and closed in the radial direction.
Cylindrical shape forming the base of the inner bit assembly (20)
Attached to the approximate center of the inner tube (21),
It is located on the opposite side in the radial direction, and is
Side surface of the latch (27) urged radially outward
(27b) and press the inner bit assembly
By rotating (20), the inner bit
The present invention resides in a method for injecting a chemical solution, which comprises drilling a ground . The gist of the invention described in claim 3 is that a cylindrical
The inner tube (21) forms a substrate,
The bite (22) is located at the base end of the
The occlusal part (22) is a male part on the proximal side.
(22a) has a cross-shaped leg (22b) on the tip side.
And the legs (22b) are spear pins (23).
The spear holder (24), which is a short tubular body.
Attached to the occlusal part (22) and the spear holder
-(24) closes the proximal end of the inner tube (21)
In the inner bit assembly (20) which is not closed
The drilling method according to claim 1, wherein drilling is performed while water is sprayed from the portion to the drilling surface .

However, the "method of injecting a chemical solution" of the present invention.
Does not include the so-called double pipe double packer method.

[0010]

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

First, a drilling device 1 used in the method of performing chemical injection according to the present embodiment will be described. As shown in FIG. 1, the drilling device 1 is for drilling a ground G in a vertical direction, and is roughly composed of a casing pipe 10 and an inner bit assembly 20 inserted therein and located on the distal end side. ing. In the present embodiment, the tip side refers to the side of the drilling direction (the direction indicated by the white arrow in FIGS. 1 and 2). In the drawing, reference numeral 40 is an overshot, and reference numeral 50 is a reference numeral.
Is a wire. FIG. 1 is simplified for the sake of space.

As shown in FIG. 2, the casing pipe 10 includes a plurality of rods 11 connected in the axial direction, and a top casing 1 connected to the rods 11 and located at the tip.
2 is roughly constituted.

The rod 11 is a cylindrical body having a male thread cut at a distal end and a female thread cut at a proximal (ground surface) end.

The top casing 12 has an outer bit 13 screwed to the distal end and a female thread cut to the proximal end. The male screw of the rod 11 is screwed to this female screw, and the outer bit 13 is located on the distal end side. The inside diameter of the portion where the latch 27 comes into contact is larger than the inside diameter of the distal end of the rod 11, and a step 11a is formed. Further, as shown in FIGS. 2 and 3, a convex portion 12a is provided in a part of the circumferential direction so as to extend in the axial direction.

As shown in FIG. 2, the inner bit assembly 20 has a cylindrical inner tube 21 as a base. An inner bit 33 is screwed to the distal end side of the inner tube 21. A spear (occlusal portion) 22 is attached to the proximal end side of the inner tube 21.

As shown in FIGS. 2 and 4, the spear 22 has a male portion 22a (not shown in FIG. 4) on the base end side.
A cross-shaped leg 22b is formed on the distal end side. The leg 22b is attached to a spear holder 24 by a spear pin 23.

The spear holder 24 is a short tubular body. A flange 24a protruding radially inward is formed on the proximal end, and a male screw is cut on the distal end. The spear holder 24 is attached to the latch holder 25.

As shown in FIGS. 2 and 5, the latch holder 25 is a substantially cylindrical body having two latch holding pieces 25a at the distal end side, and is provided with a base of the inner tube 21 (not shown in FIG. 5). The end outer surface is slidably covered in the axial direction. The two latching pieces 25a have the same shape, are curved with the same curvature as the cylindrical portion, and are spaced at a predetermined interval in the circumferential direction. A rectangular latch hole 25b is opened at a substantially central portion in the longitudinal direction of each latch holding piece 25a. A bolt hole 25c is formed in the base. This bolt hole 25c
The latch holder 25 is attached to the inner tube 21 by a pair of stopper bolts 26 (not shown in FIG. 5) which are provided on the opposite side in the radial direction.

The latch 27 is mounted substantially at the center of the inner tube 21 so as to be freely opened and closed in the radial direction. The two latches 27 are located on opposite sides in the radial direction as shown in FIG.
It is urged radially outward by a latch spring 28 (not shown in FIG. 3). Therefore, the latch holder 2
5 is attached to the inner tube 21,
The outer portion of the latch 27 in the radial direction is inserted into the latch hole 25b shown in FIGS.

At the proximal end of the inner tube 21,
As shown in FIG. 2, a spring push 32 is screwed. The spring push 32 is a short tubular body,
A flange 32a protruding radially outward is formed at the proximal end. The proximal end surface of the flange 32a is
The spear holder 24 is in contact with the front end surface. The flange 32a is pressed by a spring 31 interposed between the front end surface and the inner peripheral projection 25e of the latch holder 25. The spring 31 presses the spring push 32 toward the proximal end, and the latch holder 25 screwed to the spear holder 24 is in a state of being urged toward the distal end. In the figure, reference numerals 29 and 30 are O-rings.

Next, an overshot 40 (inner bit lifting device) for lifting the inner bit assembly 20 will be described. Overshot 40
Is connected to a wire 50 as shown in FIG. 6, and a spear latch 41 (occlusal portion) is provided at the tip.

The spear latch 41 has two latch pieces 42.
(The latch piece 42 indicated by a two-dot chain line on the right side of the paper is shown in an open state) is a washing scissors-like member rotatably connected by a spring pin 43 at a substantially central portion. The distal end side is formed in a shape that can bite the spear 22. The proximal end is urged by a latch spring 45 so that the distal end is closed. The spear latch 41 is connected to a latch out ring 46 by another spring pin 44. The latch out ring 46 is connected to a pipe 48 via a hanger shaft 47. A cap 49 is screwed on the proximal end of the pipe 48.

Next, the operation of the drilling apparatus 1 configured as described above will be described with reference to FIGS. 7 to 9 are partial sectional views. The latch 27 is depicted on its side.

When excavating, as shown in FIG. 7, the step 11a of the rod 11 presses the free end 27a of the latch 27 so that the rod 11 pushes the inner bit assembly 20. At the same time, the protruding portion 12a of the top casing 12 shown in FIG. 3 presses the side surface 27b of the latch 27 to rotate the inner bit assembly 20. By these operations, the inner bit 33 (FIGS. 7 to 9)
(Not shown) can drill the ground (the casing pipe 10 itself including the rod 11 is rotated and excavated by a boring machine installed on the ground surface). As a result, the ground can be drilled by the inner bit 33 together with the outer bit 13 (not shown in FIGS. 7 to 9). As the outer bit 13, an existing ring bit, metal crown, or the like can be used. As the inner bit 33, a bit having the same shape as an existing cross bit or button bit can be used.

The overshot 40 (not shown in FIGS. 7 to 9) connected to the wire 50 is lowered into the casing pipe 10, and the spear latch 41 urged inward in the radial direction is connected to the spear 22 shown in FIG. When it abuts, it opens along its shape and engages the spear 22 as shown in FIG.

When the wire 50 is wound up with the spear latch 41 engaged with the spear 22, the latch holder 2
5 slides to the proximal end side, and the inner end surface 25d also shown in FIG. When the wire 50 is further wound, as shown in FIG.
5d presses the latch 27 to close it. When the wire 50 is further wound up, the front end surface 25f shown in FIG. Further wire 50
, The inner bit assembly 20 can be pulled up.

Next, a method of injecting the present chemical using the drilling device 1 will be described with reference to FIGS.

First, as shown in FIG. 10, the ground G is drilled to a predetermined depth by the drilling device 1 and the casing pipe 1 is drilled.
0 is installed underground.

After the drilling is completed, the wire 50 is wound up and the inner assembly 20 is pulled up by the overshot 40 as shown in FIG.

Next, as shown in FIG.
0 is built in the casing pipe 10. In the figure, reference numeral 6
Reference numeral 1 denotes an injection port for discharging an injection material.

Next, the casing pipe 10 is pulled up with the injection rod 60 remaining. At this time, the casing pipe 10 is completely pulled out to the ground.

Next, as shown in FIG.
From the injection port 61 of 0, an instantaneous injection material as a primary injection material gf is injected into the gap between the outer peripheral surface of the injection rod 60, the excavation hole and the gap, and the ground material is roughly injected into the ground G.

Next, as shown in FIG. 14, a loosely or long-lasting injection material is injected into the ground G from the injection port 61 as a secondary injection material gs.
To form consolidated soil C.

Thereafter, the process of raising the required amount of the injection rod 60 and the step of injecting the primary injection material gf and the secondary injection material gs are alternately repeated to form the consolidated soil C to a predetermined depth.

Next, the effect of the method for injecting a chemical according to the present embodiment will be described.

Since the inner bit 33 is provided at the end of the casing pipe 10, the casing can be bored without causing the core of the casing pipe 10 to be clogged. It becomes unnecessary. Also, the inner bit assembly 20 can be quickly pulled up simply by engaging the overshot 40 attached to the tip of the wire 50 with the inner bit assembly 20 and winding up the wire 50. Injection rod 60 in casing pipe 10
Can be built. As a result, the construction period can be shortened, and the construction cost can be reduced.

When actually drilling holes, it is preferable to drill holes while pouring water from the inside of the inner bit assembly 20 to the drilling surface. Such water discharge is possible because the spear 22 and the spear holder 24 do not block the base end side of the inner tube 21 as shown in FIGS.

Further, the rod 11, the top casing 1
2. The length, diameter and shape of the inner bit assembly 20 may be suitable for practicing the present invention unless otherwise specified.

In the above embodiment, the spear (occlusal portion) 22 is attached to the inner bit assembly 20.
Although the spear latch (occlusal portion) 41 is provided on the overshot 40, in the present invention, the occlusal portion may be provided on the inner bit assembly 20 and the occlusal portion may be provided on the overshot 40.

Further, the bite portion and bite portion are not limited to the above-described embodiment, and any structure may be used in the present invention as long as they can bite each other.

In the above embodiment, the case of the double-phase double pipe strainer method in which the secondary injection step is performed is described.
In the present invention, the present invention can be applied to a single-phase double-tube strainer method in which only the primary injection step is performed, a single-tube rod injection method, or the like.

The present invention is not limited to the ascending step implantation but can be applied to the descending step implantation.

In the above figure, the same components are denoted by the same reference numerals.

[0044]

Since the present invention is configured as described above, the following effects can be obtained.

(1) Since the inner bit 33 is provided in the casing pipe, casing drilling can be performed without causing clogging of the core in the casing pipe.

(2) By simply pulling out the wire, the inner bit attached to the tip of the casing pipe can be pulled up, and the injection rod can be built into the casing pipe immediately after drilling.

(3) At the time of drilling, since the inner bit is attached to the front end of the casing so as not to fall off, the inner bit can be rotated both forward and reverse, and drilling can be performed efficiently.

As a result, according to the present invention, the construction period can be shortened, the construction cost can be reduced, and the construction labor can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a drilling apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 3;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along the line CC of FIG. 2;

FIG. 5 is a perspective view of a latch holder.

FIG. 6 is a side view of an overshot.

FIG. 7 is a view showing the operation of the drilling device.

FIG. 8 is a diagram showing the operation of the drilling device.

FIG. 9 is a diagram showing the operation of the drilling device.

FIG. 10 is a process chart of a method for injecting a chemical solution according to the embodiment.

FIG. 11 is a process chart of a method for injecting a chemical solution according to the embodiment.

FIG. 12 is a process chart of a method for injecting a chemical solution according to the embodiment.

FIG. 13 is a process chart of a method for injecting a chemical solution according to the embodiment.

FIG. 14 is a process chart of a method for injecting a chemical solution according to the embodiment.

[Explanation of symbols]

 C Consolidated soil gf, gs Injection material 1 Drilling device 10 Casing pipe 11 Rod 11a Step portion 12 Top casing 12a Convex portion 13 Outer bit 20 Inner bit assembly 21 Inner tube 22 Spear 22a Male portion 22b Leg 23 Spear pin 24 Spear holder Reference numeral 24a Flange 25 Latch holder 25a Latch clipping piece 25b Latch hole 25c Bolt hole 25d Inner end surface 25e Inner peripheral convex portion 25f End side 26 Stopper bolt 27 Latch 27a Free end 27b Side surface 27c Fixed end 28 Latch spring 29, 30 O-ring 31 spring 32 Spring push 32a Flange 33 Inner bit 34 Water channel 40 Overshot 41 Spear latch 42 Latch piece 43,44 Spring pin 45 Latch Ne 46 latch out ring 47 hanger shaft 48 pipe 49 cap 50 wire 60 implanted rod 61 inlet

Claims (3)

(57) [Claims] After drilling the ground, a solidified material is injected into the ground from an injection hole provided near a lower end of an injection rod built in the excavation hole to form consolidated soil. (1) An outer bit is provided at an end, a casing pipe connected in an axial direction, and an occluded part inserted at an end part in the casing pipe is rearward. Drilling the ground with the inner bit assembly provided at the end and having the inner bit undetachably attached to the tip and installing the casing pipe in the ground; (2) biting the bite portion With a possible bite at the tip,
An inner bit lifting device having a rear end connected to a wire is inserted into the casing pipe, and the bite portion is engaged with the bite portion of the inner bit assembly at the tip of the casing pipe, and the wire is pulled out. a step of refloat the inner bit assembly together with the inner bit by the steps of Tatekomu the (3) the injection rod into the casing pipe, comprising the steps of refloat the casing pipe while leaving the (4) infusion rod, (5) a step of injecting a solidifying material from the injection port of the injection rod to form consolidated soil, wherein the top casing is located at a tip of the casing pipe.
(12a) provided on a part of the lug (12) in the circumferential direction
The inner bit assemble can be freely opened and closed in the radial direction.
Cylindrical inner tube (2)
1) is attached to the approximate center, located on the opposite side in the radial direction,
Biased radially outward by the latch spring (28)
Press the side surface (27b) of the latch (27)
For the operation of rotating the inner bit assembly (20)
Therefore, the inner bit drills the ground, and the chemical solution is injected. 2. After drilling the ground, a solidified material is injected into the ground from an injection hole provided near a lower end of an injection rod built in the excavation hole to form consolidated soil. A method of injecting a chemical solution to be strengthened, comprising: (1) an axially connected casing pipe having an outer bit provided at a tip thereof, and a rear end having an occlusal portion inserted at the tip of the casing pipe. A step of drilling the ground by means of an inner bit assembly provided at the tip and having the inner bit undetachably attached to the tip end and installing the casing pipe in the ground; and (2) the bite portion can bite Having the bite portion at the tip,
An inner bit lifting device having a rear end connected to a wire is inserted into the casing pipe, a bite portion of the inner bit assembly at a tip portion of the casing pipe is bited by the bite portion, and the wire is pulled out. a step of refloat the inner bit assembly together with the inner bit by the steps of Tatekomu the (3) the injection rod into the casing pipe, comprising the steps of refloat the casing pipe while leaving the (4) infusion rod, (5) a step of injecting a solidifying material from the injection port of the injection rod to form consolidated soil, wherein the top casing is located at a tip of the casing pipe.
(12a) provided on a part of the lug (12) in the circumferential direction
The inner bit assemble can be freely opened and closed in the radial direction.
Cylindrical inner tube (2)
1) is attached to the approximate center, located on the opposite side in the radial direction,
Biased radially outward by the latch spring (28)
Press the side surface (27b) of the latch (27)
For the operation of rotating the inner bit assembly (20)
Therefore, the inner bit drills the ground, and the chemical solution is injected. 3. A base material comprising : a tubular inner tube (21);
And a proximal end of the inner tube (21)
The occlusal part (22) is attached, and the occlusal part (2 ) is attached.
2) is a male part (22a) at the base end and a cross at the tip end
A leg-shaped leg (22b) is formed, and the leg (22b) is
A spiaho which is a short tubular body is formed by a pier pin (23).
The occlusal part (22) is attached to the rudder (24).
And the spear holder (24) is an inner tube.
(21) The inner bit of which the base end side is not closed.
While spraying water from inside the assembly (20) to the drilled surface
The method according to claim 1, wherein the hole is drilled .