JP2741653B2 - Drilling tube for 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 chemical injection for injecting a chemical into the ground for the purpose of strengthening the ground around the underground structure when constructing various underground structures such as tunnels and foundations. For drilling pipes

[0002]

2. Description of the Related Art Conventionally, when constructing an underground structure, a drilling hole is previously drilled from the ground for the purpose of strengthening the ground around the structure or stopping water, etc. The ground improvement to inject a chemical solution into the ground is performed.

[0003] As a conventional chemical liquid injection method, a water supply hose is connected via a water swivel to an upper end of a boring rod to which a rotating force is applied by a boring device, and a boring rod having a drilling blade at a lower end is sprayed with water from the lower end. Rotate while pushing it into the ground to a predetermined depth, dug down to a predetermined depth while adding a rod appropriately, and then pull up the rod upward while ejecting the chemical solution from the lower end of the rod by the water pump pressure Next, a layer of the solidified body by the chemical solution is constructed.

[0004]

The demand for this chemical solution injection work is increasing as urban development progresses. In urban areas, however, pipes such as gas pipes, water pipes, sewage pipes, etc. Since many buried objects such as common trenches for telephone and power cables are buried, it is necessary to investigate beforehand the presence or absence of these buried objects near the construction site before starting construction.

Needless to say, it is necessary to avoid injecting a chemical solution in a place where the presence of the above-mentioned buried object is confirmed. However, a part of the buried object is located in a place where its existence is difficult to be confirmed, such as under a national road. In some cases, the chemical solution must be injected in such a place if necessary. In such a case, the boring is performed to the upper part of the depth where the buried object is presumed to be present.

[0006] As described above, when boring is performed in the ground where the buried object is presumed to exist, the depth of the buried object is not specifically known, so that the boring rod is rotated. Excavation may cause accidental damage to buried objects, causing a major accident. Conventionally, to prevent such accidents from occurring, excavation is performed by moving the boring rod up and down while spraying water from the lower end of the boring rod into the underground where it is estimated that buried objects exist. However, such a method is not appropriate as a measure for preventing damage to a buried object, and has a problem that the efficiency is extremely poor.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the problem of boring in the ground where it is presumed that such a buried object exists. As a means, in a drilling pipe for chemical liquid injection for constructing a solid body for soil improvement in the ground, a water injection hose nozzle for drilling and a small TV camera or endoscope are provided inside the lower end of the drilling pipe. It is characterized in that it is rotatably provided with respect to the inner wall of the bored pipe, and a connecting pipe that can be opened and closed in a length direction is added to the upper end of the bored pipe.

Means for providing a water injection hose nozzle for drilling and a small TV camera or an endoscope inside the lower end of the drilling tube so as to be rotatable with respect to the inner wall of the drilling tube include: On the inner wall, a disc-shaped holder for closing the inner wall is provided rotatably, and a small TV at the tip of the nozzle of the water injection hose and the tip of the camera cable, which are conducted into the drilled pipe.
A camera or endoscope is fixedly mounted on the disc-shaped holder.

[0009]

According to the present invention, since a water injection hose nozzle for drilling and a small TV camera or endoscope are provided inside the lower end of the drilling pipe so as to be rotatable with respect to the inner wall of the drilling pipe. When the pipe is pushed into the ground, the water injection hose and the cable for the TV camera provided in the pipe are not twisted even when the drilled pipe is rotated, and the drilled pipe is spouted with water from the lower excavation blade. The excavation is advanced by rotating, and in the process, the presence or absence of underground objects can be monitored from the ground using a small camera or endoscope, so that the drilling hole for chemical injection can be safely drilled without fear of damaging the underground objects. Can be set up.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a drilling tube for chemical injection according to the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is an overall explanatory view of a drilling tube 1 (boring rod), and FIG. It is an expanded sectional view showing the composition of the lower end part of tube 1. As shown in FIG. 3, the drilled pipe 1 has a drilled pipe main body 1 having a drilling blade 2 at a lower end and a predetermined length, and a connecting pipe 11 appropriately extended above the drilled pipe main body 1. The drilling pipe main body 1 is first pushed into the ground by the excavation blade 2 by being supported by the rotation transmitting portion 4 of the boring device 3 and being transmitted rotation.

A water injection pump 5 and a television monitoring device 8 are provided outside the boring device 3. Two water injection hoses 6 extending from the water injection pump 5 and one television cable extending from the television monitoring device 8. 9 are introduced into the pipe from the upper end of the drilled pipe main body 1 supported by the rotation drive unit 4 via a suspension guide 12 provided above the rotation transmission unit 4 in the boring device 3. 6
The nozzle 7 at the end of the hole and the small TV camera 10 at the end of the cable 9 are rotatably attached to the inner wall at the lower end of the drilled tube main body 1.

A disk-shaped holder 13 for closing the inner wall of the drilled pipe main body 1, preferably directly above the excavating blade 2, is closed via a bearing 14 and a water-stopping O-ring 15. The water injection nozzle 7 at the end of the hose 6 and the small TV camera 10 at the end of the cable 9 are fixedly mounted on the disc-shaped holder 13. Note that the small TV camera 10 may be an endoscope.

The drilling pipe main body 1 is rotated by the rotation transmitting portion 4 of the boring device 3 while the water injection hose 6 is rotated.
, And water is ejected from the nozzle 7 to be sequentially pushed into the ground. As shown in FIG. 3, when it is necessary to add another drilling pipe after the drilling pipe main body 1 is pushed into a predetermined depth, a connecting pipe 11 is attached to the upper end of the drilling pipe main body 1. Is added. As shown in FIG. 3, the connecting pipe 11 connects two gutter-shaped plates 16 by hinges 17 so as to be openable and closable in a longitudinal direction, and fixes the fixture 1 such as a ring or a band.
8, a closed state can be maintained in a cylindrical shape, and both ends have a connection portion 19 formed by a screw or a coupling which can be joined to the drilled tube main body 1 or another connection tube 11.

When connecting the connecting pipe 11 to the upper end of the drilled pipe main body 1, the two gutter-shaped plates 16 are opened by the hinge 17, and the water injection hose 6 suspended from the upper hanging guide 12 and Wrap the cable 9 inside and close it,
The lower end connecting portion 19 is connected to the upper end of the drilled pipe main body 1 by being fixed in a tubular shape by the fixture 18, and the rotation of the drilling pipe main body 1 is transmitted to the connection pipe 11 by the rotation transmitting portion 4. Send into the ground. Connection pipe 1 added as described above
When the pipe 1 is sent into the ground, the drilled pipe main body 1 can be pushed into a predetermined depth by adding another connection pipe 11 to the upper end of the connection pipe 11.

[0015]

According to the drilling pipe of the present invention, a hose for water injection 6 and a cable 9 for a TV camera are introduced into the pipe, and the nozzle 7 and the small TV set at the tip of the hose 6 and the cable 9 are introduced.
Since the camera or the endoscope 10 is fixedly mounted on the disc-shaped holder 13 rotatably provided on the inner wall of the lower end of the tube, the disc-shaped holder 13 does not rotate even when the drilled tube 1 is rotated by the boring device 3. Therefore, drilling can be performed without giving a twist to the hose 6 and the cable 9.

Since the drilled pipe can be rotated without twisting the hose 6 and the cable 9 in which the drilled pipe is arranged, the hose 6 and the cable 9 can be sequentially extended from the ground according to the depth of pushing the drilled pipe into the ground. Water can be spouted from the lower end of the drilled pipe, and a small TV camera or endoscope 10
Thereby, while observing the ground state of the drilled portion from the ground, the state where there is no buried object 20 can be confirmed and drilling can be continued.

The position of the small TV camera or the endoscope 10 is close to the lower end of the drilling tube, and water is continuously squirting from the lower end of the drilling tube. Since the state can be easily confirmed by the monitoring device on the ground, when the excavating blade 2 approaches the buried object 20 in the ground, it is possible to confirm the abnormality of the ground condition to be excavated. It is possible to prevent the occurrence of a major accident due to damage.

In addition, in the drilling pipe of the present invention, the drilling pipe is provided with a drilling pipe main body 1 for mounting a water injection hose and a nozzle, a TV cable and a camera, and the hose connected to the drilling pipe main body. Since the connection pipe 11 is configured by the openable and closable connection pipe 11 that can conduct the cable, it is not necessary to remove the water injection hose or the TV cable when connecting the drilled pipe main body and the connection pipe. It can be performed smoothly and efficiently in a dry state without getting wet with water.

Further, according to the drilled tube of the present invention, a small TV
Cameras or endoscopes can be used to confirm the presence of objects buried underground to prevent the occurrence of accidents, and to conduct drilling without twisting the drilling pipe that rotates the water injection hose and nozzle. Since water can be spouted in the process of drilling, after drilling to a predetermined depth without damaging the buried object, the drilling water sprayed from the water injection nozzle is switched to a chemical solution, and the Thus, there is an advantage that a chemical solution for ground improvement can be extracted into the ground through the ground, and a chemical solution injection operation at a part of the buried object, which has conventionally been a problem, can be performed safely while preventing damage to the buried object.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of a drilling pipe for chemical injection according to the present invention.

FIG. 2 is an enlarged sectional view showing a configuration of a lower end portion of a drilled pipe.

FIG. 3 is a sectional view showing a drilling process of the drilling tube.

FIG. 4 is a perspective view showing a configuration of a connection pipe connected to a drilled pipe main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling pipe main body 2 Drilling blade 3 Boring device 4 Rotation transmission part 5 Water injection pump 6 Water injection hose 7 Water injection nozzle 8 TV monitoring device 9 Cable 10 Small TV camera / endoscope 11 Connection pipe 12 Hanging guide 13 Disk holder 14 Bearing 15 O-ring 16 Gutter plate 17 Hinge 18 Fixture 19 Connection part 20 Buried object

Claims (2)

(57) [Claims] 1. A drilling tube for injecting a chemical solution for constructing a solid body for ground improvement in the ground, wherein a water injection hose nozzle for drilling and a small TV camera or endoscope are provided inside the lower end of the drilling tube. A drilling tube for injecting a chemical solution, wherein the drilling tube is provided rotatably with respect to the inner wall of the drilling tube, and a connecting pipe which can be opened and closed in a length direction is added to an upper end of the drilling tube. 2. A disc-shaped holder rotatably provided on an inner wall at a lower end portion of a drilling tube so as to close the inner wall, and a nozzle at a tip of a water injection hose and a tip of a camera cable connected to the drilling tube. 2. The drilling tube for chemical injection according to claim 1, wherein a small TV camera or an endoscope is fixedly mounted on said disc-shaped holder.