JP3348934B2 - Grout injection device using flexible injection tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting device for inserting grout by inserting a flexible filling tube with a packer into an outer tube installed in the ground.

[0002]

2. Description of the Related Art In recent years, there have been a wide variety of ground injection methods, and various methods have been developed. One of the methods is to form injection holes at appropriate intervals in the ground and to use this injection method. After inserting and installing an outer tube wrapped with a rubber sleeve so as to cover the hole, insert a double tube-type injection tube with a double packer into this outer tube, and supply packer water from one of the flow paths. In a state where the upper and lower double packers are used, a grout injection material is supplied to the packer portion through the other flow path of the injection pipe, and the grout material is injected into the ground through the injection hole of the outer pipe. It is heavily used.

In such an injection method, when installing the injection pipe, a large number of short double-walled steel pipes are prepared in advance, and the short steel pipes are successively added to extend over several tens of meters. Is included.

[0004]

However, with the enlargement and deepening of the ground injection scale, the work of attaching and detaching the injection pipe has to be performed because the injection pipe is heavy or works inside the hole. Due to the inability to secure construction space, it has become a very heavy labor.

[0005] In addition, even when the outer pipe is installed, it is inserted into the ground while using a boring machine or the like while adding a hole. Particularly, when the drilling length is long, the hole is easily bent. In many cases, the tube is inserted while deforming in the middle of the tube. In such a case, even if an attempt is made to insert a rigid injection tube into the outer tube, the frictional force between the two may be too large to make insertion of the injection tube difficult. For this reason, various devices have been proposed in which the injection tube is made flexible so that it is wound on a reel, sequentially pulled out from the reel and inserted into the outer tube, and adapted to bend the hole. In the connection portion of the flexible injection tube to the reel shaft, the connection direction is orthogonal to the winding direction of the injection tube, so that when the flexible injection tube is wound up, it swells outward or bends at the connection portion. This causes problems such as the inability to smoothly feed grout material and the like. In addition, when the two injection pipes for grout and packer are wound simultaneously, the two injection pipes are easily entangled at the time of winding, and their lengths are different due to a line segment difference in the wound state. However, there is a problem that it is not possible to feed out in a uniform state. Further, there is a problem that it is extremely difficult to measure the feeding length.

[0006] On the other hand, in the injection management in the limited injection method, the injection is repeated every time a pulling of several tens of cm, most often about 30 to 50 cm, is performed. Since pressure injection, grout injection, packer depressurization, and pulling up by reel rotation are performed in order, the number of valves to be operated is large, and since there are also many management items, it may not depend only on manual operation by humans Operation errors are likely to occur.

Accordingly, a main object of the present invention is to solve the above-mentioned problems at once, and to contribute to automation of a series of injection operations, a grout injection device provided with a flexible injection tube winding device. Is provided.

[0008]

The object of the present invention is to provide a take-up reel which is rotatably supported on a movable carriage around a horizontal axis and driven by a rotary drive means, and which supports the take-up reel. A flow path for the grout injection material and a flow path for the packer working liquid or gas are formed in the rotating shaft, and a swivel communicating with each of the flow paths is provided on one end side and / or the other end side of the rotating shaft. In addition, a flow path connection port for the grout injection material and a flow path connection port for the packer working liquid or gas are provided in the middle of the rotation shaft, and at least one of these connection ports is substantially in the radial direction of the reel. The problem can be solved by connecting a tube material extending to the tube and connecting a flexible injection tube to the tip of the tube material.

In the connection relationship between the tube and each connection port, a flexible injection double tube consisting of a flexible outer tube and a flexible inner tube is connected to the tip of the tube, while the tube is connected to the tip. Another connection port may be connected to allow the two flow paths in the flexible injection double pipe to communicate with the grout injection material flow path and the packer working liquid or gas flow path, respectively.

In order to automate a series of injection operations, a flow meter and a control valve are provided in the middle of a grout hose connected to the swivel for feeding the grout injection material, and the packer working fluid is provided. Or, a pressure detector and a switching control valve for supplying and discharging the packer working fluid or gas are provided in the middle of the hose for the packer connected to the swivel to supply gas, and the flexible injection is provided to the movable carriage. A detection drum that is driven to rotate in contact with the pipe, and a stroke detector that detects a rotational displacement of the detection drum to detect a stroke length of the flexible injection pipe; A stroke setting device for setting a winding length for each stage of the tube and a step number setting device for setting the number of windings;
A controller for controlling a series of operations from packer inflation, grout injection, packer restoration, and pulling up of the flexible injection pipe based on a pressure detector of the packer working fluid or gas and a measurement signal of the grout injection material flow meter. Prepare.

[0011]

In the present invention, a flexible injection tube is used as the injection tube, and is inserted into the outer tube so as to be unwound from the take-up reel. Therefore, it is not necessary to connect the short injection pipes as in the related art, and even if the hole is bent, it can be deformed and inserted smoothly. In addition, since a pipe material substantially in the radial direction of the reel is connected to a connection port provided in the middle of the rotation shaft, and a flexible injection pipe is connected to a tip end of the pipe material, swelling at the time of winding up and the injection pipe Of the grouting material and the like can be smoothly fed. In this case, the small-diameter tubing for the packer is directly connected to the connection port of the rotating shaft portion, but the small-diameter tubing for the packer runs along the outside of the flexible grouting injection tube.

Further, one of the connection ports is connected to a pipe material substantially in the radial direction of the reel, and a distal end portion of the pipe material is provided with a flexible outer pipe and a flexible inner pipe. While connecting the flexible injection double pipe, connecting the tip and another connection port, the two flow paths in the flexible injection double pipe are connected to the grout injection material flow path and the packer hydraulic fluid or gas. By making them communicate with the flow channels, respectively, it becomes possible to form one injection pipe, and also prevent swelling or bending of the grout injection pipe and the parker injection pipe during winding.

Further, the connection corresponding to the flexible triple pipe is easy, and in this case, the main agent and the curing agent are fed to the injection section, and the ground or the ground is formed by a 1.5 shot or 2 shot method. This method can be applied to the case where the injection is carried out into a liquid, or the case where a compound injection method is performed in which a quick-setting drug solution and a slow-setting drug solution having a gel time of several minutes or more are combined.

A flow meter and a control valve are provided in the middle of the grouting hose, and a pressure detector and a switching control valve for supplying and discharging the liquid for the packer are provided in the middle of the hose for the packer. Therefore, information for sequence control is obtained by each of these measuring instruments, and direct injection operation and the like are directly controlled by these control valves. In addition, a stroke detector for detecting the rotational displacement of the detection drum is provided.
A stroke setting device for setting the pulling length for each stage and a step number setting device for setting the number of windings are provided, and the stroke detector, the pressure detector for the packer liquid, and the grout injection material flow meter are used based on measurement signals. Since a controller for controlling a series of injection operations is provided, a series of operations from packer inflation, grout injection, packer restoration, and pulling up of the flexible injection tube can be automatically performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.

In FIG. 1 to FIG. 3, supporting columns 6, 6 are erected on a movable table 1 movable by wheels 2, 2,..., And fixed to the tops of the supporting columns 6, 6. The rotating shaft 5 of the take-up reel 3 is rotatably supported by the bearings 7, 7, and the rotating force of the motor 4 fixed to the supporting column 6 is transmitted to the sprocket of the rotating shaft 5 by a chain 8 to rotate. Driven. Reference numeral 9 denotes a clutch for intermittently connecting the rotational force from the motor 4 to the rotating shaft 5 of the take-up reel 3 as needed, and draws out the flexible injection pipe P wound around the take-up reel 3. In this case, the clutch 10 is disconnected, the take-up reel 3 is freely rotated, and the flexible injection tube P is fed out. The injection pipe P is pulled up.

As shown in FIG. 4, a flow path 5a for the grout injection material, a flow path 5b for the packer working fluid, and a flow path 5c for the grout injection material are formed in the rotary shaft 5, as shown in FIG. I have. As the flow path, at least two flow paths of a grout injection material flow path 5a and a packer working liquid flow path 5b are required at a minimum, and two liquids of a main agent and a curing agent are further supplied as grout injection material. In the case of performing the injection or in the case of supplying two liquids of a slow-setting liquid and a quick-setting liquid in the case of a compound injection, two channels for grout injection material are formed as shown in the figure. Note that three flow paths may be formed in advance as shown in the figure, and only necessary flow paths may be used depending on the injection mode.

A swivel 15 communicating with the grout-injecting material flow path 5a is attached to one end of the rotating shaft 5, and the packer hydraulic fluid flow path 5b and the other end are connected to the other end. A swivel 16 is attached to communicate with the grout injection material flow path 5c. In this embodiment, a swivel 15 and a swivel 15 are provided on both sides of the rotary shaft 5.
Although 16 is provided, the formation of the flow path in the rotating shaft 5 is complicated, but a swivel may be provided on only one side of the rotating shaft 5.

As a first example, as shown in FIG. 5, a part of a side surface of the rotating shaft 5 is cut out to form a seating surface 5A, as shown in FIG. An extension pipe (tube material according to the present invention) 51 which is in communication with the grout injection material flow path 5a and extends substantially in the radial direction of the reel is connected. The extension tube 51 has a mounting base 50 fixed to the base end side,
A tip head 55 is fixedly provided on the tip side, and the mounting base 50 is fixed to the seat surface 5 by bolts 50a, 50a.
a. The flexible injection tube 25 is connected to the connection port of the tip head 55. on the other hand,
The packer tube 26 is directly connected to the packer working fluid flow path 5b, and the flexible injection tube 25 and the packer tube 26 are wound in parallel and simultaneously.
A payout is performed.

Next, as a second example, FIG. 6 and FIG.
As shown in the figure, the flexible injection tube is formed as an injection tube having a double tube structure by the outer injection tube 33 and the inner injection tube (packer tube) 32, and the first injection tube is provided for the grout injection material flow path 5a. As in the example, the extension tube 51 is connected, and the outer tube 33 is connected to the distal end head 52 of the extension tube 51.
As for the inner tube 32, a connection hole 56 is formed on the opposite side of the tip head 52 to the side where the injection outer tube 33 is connected, and the inner tube 32 is connected to the inside of the connection hole 56, The connection hole 56 and the packer working liquid flow path 5b are connected by a connection tube 54.

Further, as a third example, as shown in FIG.
And a grout tube 62, which is a flexible injection tube that secures three flow paths. An extension pipe 51 is connected to the grout injection material flow path 5a as in the first example. The distal end head 52 of the extension tube 51 is connected to the outer injection tube 3.
3 is connected. As for the packer tube 61 and the grout tube 62, two connection holes 5 are formed on the opposite side of the tip head 52 to the side where the outer injection tube 33 is connected.
9 and 60 are formed, and these tubes 61 and 62 are connected to the inside of the connection holes 59 and 60, respectively.
The connection tubes 59, 60 are connected to the connection holes 59, 60, the flow path 5b for the packer working fluid, and the flow path 5c for the grout filler, respectively.
Connect at 7,58.

These flexible injection tubes are provided at the tip with double packers which can be expanded and restored by supplying a packer working fluid. First, in the case of the flexible injection tube 25 shown in FIG. 5, as shown in FIG. 9, an upper packer 34 and a lower packer 36 made of elastic rubber or the like are provided at the tip of the injection tube 25, Tube 26 is connected to the upper packer 34, and the upper packer 34 and the lower packer 36 are connected to the connecting tube 27,
When the packer hydraulic fluid W is supplied by the packer tube 26, the upper packer 34 expands and adheres to the inner surface of the outer tube 30, and the packer hydraulic fluid W is also supplied to the lower packer 36 by the connection tube 27. It expands in the same manner as the upper packer 34 and closely adheres to the inner surface of the outer tube 30,
The grout injection material is prevented from flowing out of the section sandwiched between the upper and lower packers 34, 36. Grout injection material G fed through the inside of the flexible injection tube 25 as a flow path
Is discharged from the nozzle 28 into the space between the double packers 34 and 36, and is further injected through the injection hole 30 a of the outer tube 30 into the surrounding ground so as to push the rubber sleeve 31 wrapped outside. The space between the outer pipe 30 and the excavation hole h is filled with the sleeve grout SG to prevent the grout injection material G from escaping.

Next, in the case of the flexible injection tube shown in FIG. 6, as shown in FIG.
Is supplied to the upper packer 34 at the same time as the packer hydraulic fluid W is supplied to the lower packer 36 by the connection tube 37, and a space closed by the upper and lower packers 34, 36 is formed. The grout injection material G is supplied to the portion through the injection outer tube 33 as a flow path, and is injected into the ground so as to spread the rubber sleeve 31 of the outer tube 30. Incidentally, N2 gas may be supplied in place of the packer working liquid W.

On the other hand, the swivel 16 of the take-up reel 3
, A hose 18 for supplying the water for the packer is connected, and a pressure detector 21 and a switching control valve 19 for the water for the packer are provided in the middle of the hose 18 for the packing, and the switching control valve 19 The control air is supplied, and the supply / discharge switching of the packer water W is automatically performed. A hose 20 for feeding the grout injection material is connected to the swivel 15, and a flow meter 2 is provided in the middle of the grout hose 20.
2 and a control valve 23 are provided. The control valve 23 may be an on-off valve, but is preferably a three-way valve, and when the supply to the grout injection device is stopped, the control valve 23 is continuously returned to the mixer side continuously, so that the inside of the pipe is controlled. It is desirable to prevent sedimentation and to prevent the tube from closing.

On the other hand, a detection drum 10 which rotates in contact with the flexible injection pipe P which is continuously fed is provided on the movable carriage 1 at the feeding section of the flexible injection pipe P. And the rotation shaft 10 of the detection drum 10
a, a stroke detector 12 for reading the rotational displacement of the detection drum 10 and detecting the feeding length is provided. Reference numeral 11 denotes a pressure roller that presses the flexible injection tube P against the guide drum 10 by the spring force of a spring, and 12 denotes a guide roller for guiding the flexible injection tube P to a predetermined feeding position. is there.

In this embodiment, a controller 14 for controlling a sequence of grout injection operation is provided separately from the injection tube winding device. This controller 14
Is provided with a stroke setting device for setting the winding length of the flexible injection tube P for each stage and a step number setting device for setting the number of windings. The stroke detector 12 and the pressure of the packer operating fluid are provided. Based on the measurement signals of the detector 21 and the grout filler flow meter 22, the packer expansion,
A series of operations from grouting, packer restoration, and pulling up of the flexible injection tube are sequenced.

In actual construction, first, FIG.
As shown in (1), drilling is performed while inserting the casing pipe 40 into the ground by a drilling machine (not shown). Next, as shown in FIG. 11B, an outer tube 30 having a rubber sleeve 31 is erected at an appropriate interval inside the casing pipe 40, and a sleeve grout is inserted into a gap between the outer tube 30 and the casing pipe 40. SG is filled and the casing pipe 40 is removed.

Next, the clutch 10 of the take-up reel 3 will be described.
Then, the take-up reel 3 is freely rotated to sequentially feed out the flexible injection pipes P, and the flexible injection pipes P are inserted into the outer pipe 30. After inserting the flexible injection pipe P to the deepest part of the outer pipe 30, the discharge port of the flexible injection pipe P is positioned near the rubber sleeve 31 at the lowermost end, as shown in FIG. Then, the packer hydraulic fluid W is fed until the pressure gauge 21 reaches a predetermined pressure to expand the double packers 34 and 36 so that the double packers 34 and 36 are brought into close contact with the inner surface of the outer tube 30. The grout injection material G is fed through the rubber grout and the grout is injected from the rubber sleeve 31 into the surrounding ground. The grout injection amount for each stage is managed by the flow meter 22, and when the injection of the predetermined amount is completed, the control valve 23
Is closed and the injection at the stage is completed.

Next, the switching control valve 19 is switched by a signal from the controller 14, the packer hydraulic fluid W is drained, and the upper and lower packers 34, 36 are restored to their original shapes.

Thereafter, the flexible injection pipe P is pulled up by driving the motor 4 until the discharge port of the flexible injection pipe P comes to the position of the rubber sleeve 31 immediately above. Management of the pulling length
The pulling length is continuously measured by the stroke detector 12, and the motor 4 is driven until the value reaches the value set in the stroke setting device. When the pulling of the flexible injection tube P is completed, the packer expands again,
Grout injection and packer restoration are performed. In this way, grouting is performed in a limited manner from the position of each rubber sleeve 31 repeatedly and finally, a columnar solid body is formed in the depth direction of the ground.

[0031]

As described above, according to the present invention,
It is possible to obtain a grouting device without bulging or bending when winding the flexible filling tube, and to automate a series of filling operations of repeated packer expansion, grouting, packing recovery, and pulling up the filling tube. As a result, complicated injection work is released.

[Brief description of the drawings]

FIG. 1 is a side view of a grout injection device according to the present invention.

FIG. 2 is a front view of a grout injection device according to the present invention.

FIG. 3 is a plan view of a grout injection device according to the present invention.

FIG. 4 is an enlarged vertical sectional view of a distal end portion of a flexible injection tube.

FIG. 5 is a diagram showing a connection mode of a first flexible injection tube.

FIG. 6 is a view showing a connection mode of a second flexible injection tube.

FIG. 7 is a top view of the connection mode of the second flexible injection tube.

FIG. 8 is a view showing a connection mode of a third flexible injection tube.

FIG. 9 is an enlarged view of a distal end portion in the case of a first flexible injection tube.

FIG. 10 is an enlarged view of a distal end portion in the case of a second flexible injection tube.

FIGS. 11A to 11E are grout injection procedure diagrams.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving cart 2 Wheel 3 Take-up reel 4 Motor 5 Rotating shaft 5a Grout filler flow path 5b Packer working fluid flow path 5c Grout filler flow path 6 Support column 7 Bearing 10 Detection drum 12 Stroke detector 14 Control Device 15 Swivel 16 Swivel 19 Switching control valve 21 Pressure detector 22 Flow meter 23 Control valve 30 Outer tube 31 Rubber sleeve 32 Injection inner tube (tube for packer) 33 Injection outer tube 34 Upper packer 36 Lower packer 51 Extension tube (Tube material) ) 52 Tip Head 55 Tip Head

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norio Ohtsubo 3-17-4, Nanyodai, Hachioji-shi, Tokyo (72) Inventor Shigeo Nakajima 5-16-15, Saida, Setagaya-ku, Tokyo Front Engineering Co., Ltd. (72) Inventor Fumio Sugama 2-25-3 Ojihonmachi, Kita-ku, Tokyo Toyo Shoji Co., Ltd. (56) Reference JP-A-63-201264 (JP, A) JP-A-53-53111 (JP, A) JP JP-A-59-114321 (JP, A) JP-A-3-125786 (JP, A) JP-A-60-139828 (JP, U) JP-A-3-69031 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E02D 3/12 101 E21B 33/126

Claims (4)

(57) [Claims] 1. A winding reel which is rotatably supported about a horizontal axis and driven by a rotary drive means, and a grout injection material flow path and a packer are provided in a rotating shaft which supports the winding reel. Forming a flow path for hydraulic fluid or gas, and providing a swivel communicating with each flow path at one end side and / or the other end side of the rotary shaft, and for the grout injection material in the middle of the rotary shaft. A flow path connection port, and a flow path connection port for packer working liquid or gas are provided,
Grout injection using a flexible injection tube, characterized in that a tube material extending substantially in the radial direction of the reel is connected to at least one of the connection ports, and a flexible injection tube is connected to the tip of the tube material. apparatus. 2. A grout-injecting material flow path and a packer are provided in a rotating shaft supporting the winding reel, the winding reel being rotatably supported about a horizontal axis and driven by a rotary driving means. Forming a flow path for hydraulic fluid or gas, and providing a swivel communicating with each flow path at one end side and / or the other end side of the rotary shaft, and for the grout injection material in the middle of the rotary shaft. A flow path connection port, and a flow path connection port for packer working liquid or gas are provided,
One of these connection ports is connected to a pipe extending substantially in the radial direction of the reel, and a flexible injection double pipe consisting of a flexible outer pipe and a flexible inner pipe is connected to the distal end of the pipe. On the other hand, the front end and the other connection port are connected, and the two flow paths in the flexible injection double pipe are respectively used as the grout injection material flow path and the packer working liquid or gas flow path. A grout injection device using a flexible injection tube, wherein the grout injection device is in communication. 3. A grout injection material is provided rotatably around a horizontal axis and driven by a rotation drive means, and two grout injection material channels are provided in a rotation shaft supporting the take-up reel. And a flow path for the packer working fluid or gas, and a swivel communicating with each flow path is provided at one end side and / or the other end side of the rotary shaft, and the two A flow path connection port for grout injection material and a flow path connection port for packer working fluid or gas are provided, respectively, and one of these connection ports is connected to a pipe material extending in a substantially reel radial direction, The distal end of the tube is connected to a flexible injection triple tube consisting of a flexible outer tube and two flexible inner tubes contained in the flexible outer tube, while the distal end is connected to the other two tubes. And two connection ports, and in the flexible injection triple tube A grout injection device using a flexible injection pipe, characterized in that the three flow paths are communicated with the two grout injection material flow paths and the packer working liquid or gas flow path, respectively. 4. A grouting hose connected to the swivel for feeding the grout injection material, comprising a flow meter and a control valve in the middle of a grout hose, and supplying the packer hydraulic fluid or gas to the swivel. A pressure detector and a switching control valve for supplying / discharging the packer working fluid or gas in the middle of the connected packer hose, and a detection drum that rotates following the movable carrier in contact with the flexible injection tube. And a stroke detector for detecting the rotational displacement of the detection drum to detect the stroke length of the flexible injection tube, and further setting the winding length of the flexible injection tube for each stage. A stroke setting device for setting the number of windings and a step number setting device for setting the number of windings, the stroke detector, the pressure detector for the packer working fluid or gas, and the grout injection material flow. The controller according to any one of claims 1 to 3, further comprising: a controller that controls a series of operations from packer expansion, grouting, packer restoration, and pulling up of the flexible injection tube based on the measurement signal of the meter. The grout injection device described in the above.