JP3350856B2 - Method and apparatus for cleaning a flow path of an injection pipe having a plurality of flow paths - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep mixing method in which a solidified material such as soil and cement is mixed and stirred to form an improved column. TECHNICAL FIELD The present invention relates to a method and an apparatus for cleaning a flow path of an injection pipe having a flow path.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-62167 by the present applicant discloses a ground improvement method and an apparatus therefor. FIGS. 5A to 5G are explanatory views showing the procedure of the invention method. The rod body 10 is formed by connecting a stirring head 11 with a joint or the like to a lower end of a screw rod 13 having a screw blade 12 formed on the outer periphery. The stirring head 11 has upper and lower three-stage stirring blades 14, 15, 16 Is attached. The screw rod (injection pipe) 13 and the stirring head 11 are each formed in a double pipe structure, and an upper discharge port is opened at the lower end of the inner pipe, and a lower discharge port is opened at the lower end of the outer pipe. I have. A solidifying material such as a cement-based solidifying material is supplied to the inner pipe and the outer pipe from a device on the ground, and the solidified material is discharged from each discharge port at a predetermined pressure.

The outer diameter of the screw rod 13 is
That is, the outer diameter of the screw blade 12 is different from each stirring blade 14,1.
The diameter is formed smaller than the outer diameter of 5,16. In this case, it is preferable to set the outer diameter of the screw rod 13 so that the amount discharged from the screw blade 12 corresponds to the amount of the solidified material injected. In the drawings, one screw rod 13 and one stirring head 11 are shown. However, a two-shaft structure in which two screw rods 13 and two stirring heads 11 are connected in parallel may be used.

[0004] A ground improvement method using the above apparatus will now be described with reference to FIG. First, as shown in FIGS. 5A and 5B, the rod body 10 is fed while rotating (forward rotation), and excavation is performed to a predetermined depth in the sections A and B where no improvement is required. Next, in order to improve the tip C, FIG.
As shown in (d), the solidified material S flows from the lower discharge port of the stirring head 11.
The rod 13 is rotated forward while discharging the water, and feed is performed. The distance between the upper and lower discharge ports is almost excavated and stirred to the lower end of the improved section B. The discharge pressure of the solidified material S in this case is 1 to 50 kg /
A low pressure of cm ² is preferred.

Next, as shown in FIGS. 5E and 5F, the solidified material S is discharged from the upper discharge port and the screw rod 1 is discharged.
Stir and lift while rotating 3 forward. In this pouring, stirring and lifting step, the soil of the diameter of the screw blade 12 is sequentially carried upward by the action of the screw blade 12 and discharged to the ground, and the remaining soil and the solidified material S are mixed with the stirring blade 14, 15 and 16 are mixed and stirred. Therefore,
Volume expansion of the improved section B due to solidification material injection can be prevented. It is preferable that the amount discharged from the screw blades 12 is equal to the amount of the solidified material to be injected.

The discharge pressure from the upper discharge port in the pouring, stirring and lifting step is preferably as low as 1 to 50 kg / cm ² , but may be as high as 50 to 200 kg / cm ² . The reason why the discharge port of the solidified material in the injection stirring and withdrawing step is the upper discharge port is that the stirring blades 14, 15,
This is for making the mixing and stirring effect of No. 16 more effective.

[0007] When the pouring, stirring and lifting in the improved section B is completed, the discharge of the solidified material from the upper discharge port is stopped as shown in Fig. 5 (g), and the screw rod 13 is rotated in the reverse direction (or may be rotated in the normal direction). Withdrawing and finishing the construction.

[0008] Since the solidified material remains in the passage of the solidified material in the inner and outer pipes of the screw rod (injection pipe) 13 after the lifting is completed, the solidified material is solidified unless the flow path is immediately cleaned. Becomes impossible. Therefore, the screw rod 13
Was washed each time it was lifted and separated.

The method will be described with reference to FIG. 4. Whenever one screw rod 13 is pulled up and separated, pressurized water is injected from a solidified material injection hose 17a connected to the drill head 17. Is switched from a silo, a water tank 18 to a hose 18a connected to a water pump (not shown) by a switching valve (not shown).
After that, the outer tube of the screw rod 13 was washed with the pressurized water. In the figure, reference numeral 18b denotes a water hose used for cleaning the injection tube in the present invention. In the figure,
21 is a ground improvement machine main body, 22 is a plant, 23 is a flow meter, and 24 is a generator.

[0010]

However, in the conventional method, since the screw rod (injection pipe) 13 is washed while being suspended from the drill head 17, the construction work using the drill head 17 during the cleaning is required. Since it is not possible, construction efficiency has been reduced. In particular, in deep ground improvement with a large number of connecting rods, the reduction in construction efficiency was remarkable.

The present invention has been made in view of the above-mentioned circumstances, and does not hang the injection pipe on the drill head 17, but raises the injection pipe (screw rod 13).
The present invention provides a method and an apparatus for cleaning a flow path of an injection pipe having a plurality of flow paths, which are immediately placed on the ground and configured to separately clean the flow path of the solidified material.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, a method for cleaning a flow path of an injection pipe having a plurality of flow paths according to the present invention is completed by injecting a solidified material and being lifted to the ground. Attach the communication cap to the tip of the injection tube and attach the drainage cap to the base end, connect the water hose to the first washing port of the injection and drainage cap, pass through the first flow path of the injection tube, and attach to the tip The solidified material is discharged together with the pressurized water from another washing port of the pouring / draining cap through a blind hole communicating with another flow path of the communication cap, and then through another flow path of the injection pipe.

The apparatus for cleaning a flow path of an injection pipe having a plurality of flow paths according to the present invention is mounted on a joint at the base end of the injection pipe and communicates with a first flow path at the inlet of the injection pipe. A pouring / draining cap having a washing port and at least one other washing port communicating with at least one other flow path, and a plurality of flow paths at the tip of the injection pipe which are attached to a joint at the tip of the injection pipe; And a communication cap that communicates with each other through

Further, a screw-shaped drill bit is formed at the tip of the communication cap.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a state in which a flow path cleaning device is attached to an injection pipe having two flow paths of the present invention, FIG. 2 is a front view of a biaxial drilling head connected to a lower end of the injection pipe, and FIG. FIG. 4 is a partial explanatory view in the middle of construction by a biaxial excavating head, and FIG. 4 is a layout diagram of construction equipment.

In FIG. 1, reference numeral 30 denotes an injection pipe, 40 denotes a pouring / draining cap, and 50 denotes a communication cap.
The communication cap 50 is attached to the proximal end and the distal end of the injection tube 30, respectively. Note: The drain cap 40 is
O-ring 31 in the first flow path 31a of the inner pipe 31 at 0
b, and connected to a second flow path 32, which is another flow path outside the inner pipe 31, via a packing 33, and a first cleaning port 41 and a second cleaning port, which are other cleaning ports, respectively. It communicates with the cleaning port 42. A blind hole 51 is formed in the communication cap 50, and the first flow path 31 of the injection pipe 30 is formed in the blind hole 51.
a and the second flow path 32 are open and communicate with each other. The second flow path 32 and the second cleaning port 42
May be two or more. The blind hole 51 is sealed to the tip of the injection tube 30 via the packing 34.

A screw-shaped drill bit 52 is integrally formed at the end of the communication cap 50. In the figure, reference numeral 35 denotes a cotter pin, which is driven in a state where the injection / drainage cap 40 and the communication cap 50 are attached to hexagonal joints 36a, 36b at the base end and the tip end of the injection pipe 30, so that the two 40, 50 do not come off. The cotter pins 35 allow the two 40 and 50 to be attached and detached.

The injection / drainage cap 40 and the communication cap 50 are used for cleaning the injection pipe 30 and for storage before reuse, and the joints 36a and 36b are used when the improved column is installed. 60 (see FIG. 2). The drainage cap 40 and the communication cap 50 are not used when the screw rod 13 (the injection pipe 30) is connected to the drill head 17 shown in FIG. 4, and the injection pipe 30 is continuously connected to the drill head 17. The lower end has a drilling head 60 as shown in FIG.
(2 axes in the case of the figure). In addition, in FIG. 1, reference numeral 43 is a hanging tool, which is lifted through the hanging tool.

In FIG. 2, reference numeral 61 denotes an excavating blade, 62 denotes a stirring blade (stirring blade), a discharge port 63a from an inner pipe (first flow path) at a lower end, and an outer pipe (second flow path) at an upper end. The discharge port 63b is opened.

FIGS. 1 and 2 show the case where the flow path is composed of two flow paths, ie, a first flow path and a second flow path. Even if it has a path, it can be washed similarly.

Next, a method for cleaning the flow path of the injection pipe according to the present invention will be described with reference to FIG. The screw blade 37 is attached to the injection pipe 30 in FIG. 3, but the cleaning method is the same even if the screw blade is not attached as shown in FIG. After excavating and stirring to the lower end of the improved section, as shown in FIG. 3A, the upper outlet port 63b (FIG. 2)
After agitating and lifting one solid while discharging the solidified material from the first, the first injection pipe 30 is cut off and the drill head 17 is removed.
And move sideways as shown in (b),
With the communication cap 50 shown in FIG. 1 attached to the lower end of the injection pipe 30, the injection pipe 30 is embedded in the ground 64 while being rotated and separated from the drill head 17 as shown in FIG. Next, as shown in (d), the drill head 17 is moved above the improved column 65 and connected to the second injection pipe 30. Similarly, while the solidified material is discharged from the discharge port at the upper end, the length of one drill head is increased. Stir and lift. At this time, the pouring / draining cap 40 shown in FIG. 1 is attached to the upper end of the first injection pipe 30 embedded in the ground 64 at the same time, and the water hose 18b shown by a two-dot chain line in FIGS. When connected to the port 41 (FIG. 1) and operating a pump (not shown) to push the pressurized water into the first flow path 31a (FIG. 1), the first pressurized water flows into the first flow path 31a as shown by the arrow in FIG. The second flow path 32 (another flow path) is raised through the blind hole 51 of the communication cap 50 through the flow path 31a, and the second cleaning port 42 (another cleaning port) of the pouring / draining cap 40.
Is discharged together with the solidified material, so that the flow path of the injection pipe 30 is washed. This cleaning operation is performed simultaneously with the operation by the drill head 17. A protective cap 43 is attached to the communication cap 40 of the cleaned first injection tube 30.

However, as shown in FIG. 3, the detached injection pipe 30 may be washed without being buried in the ground 64 and placed horizontally on the ground. However, in this case, when installing the second improved column, the drill head 17 of the cleaned injection pipe 30 is used.
Takes extra time to connect to

[0023]

According to the present invention described in detail above, the following effects can be obtained. (1) The drill head is not washed while the injection pipe is suspended from the drill head as in the prior art, and the drill head continues to be constructed and can be washed separately in parallel with the drill head, thereby improving work efficiency.

(2) Since the injection pipe can be buried in the ground for cleaning, the cleaned injection pipe can be quickly connected to the drill head, and work efficiency is improved (claim 3).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, in a state where a flow channel cleaning device is mounted on an injection pipe having two flow channels.

FIG. 2 is a front view of a biaxial drilling head connected to a lower end of an injection pipe.

FIGS. 3 (a), 3 (b), 3 (c), and 3 (c) are partial explanatory views showing an embodiment of the present invention during construction by a biaxial drilling head. FIGS.
(D).

FIG. 4 is a layout diagram of construction equipment.

FIG. 5 is an explanatory view of a ground improvement method.

[Explanation of symbols]

 Reference Signs List 30 Injection pipe 31a First flow path 32 Second flow path 36a, 36b Joint part 40 Injection / drain cap 41 First washing port 42 Second washing port 50 Communication cap 51 Blind hole 52 Drilling bit

Claims (3)

(57) [Claims] 1. A filling cap is attached to a tip of a pouring pipe pulled up to the ground after the pouring of the solidified material, and a pouring / draining cap is mounted at a base end, and a water hose is provided at a first washing port of the pouring / pouring cap. Through the first flow path of the injection tube, through a blind hole communicating with the other flow path of the communication cap attached to the tip,
A method for cleaning a flow path of an injection pipe having a plurality of flow paths, wherein the solidified material is discharged together with pressure water through another flow path of the injection pipe through another flow path of the injection pipe. 2. A first washing port attached to a joint portion at a base end of the injection pipe and communicating with a first flow path at an inlet of the injection pipe, and at least one other communicating with at least one other flow path. And a communication cap attached to a joint at the tip of the injection pipe, wherein a plurality of flow paths at the tip of the injection pipe communicate with each other through blind holes. Washing device for an injection pipe having a flow path. 3. The apparatus for cleaning a flow path of an injection pipe having a plurality of flow paths according to claim 2, wherein a screw-shaped drill bit is formed at a tip of said communication cap.