JP2011231590A - Curved boring method and boring device used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the volume of sludge discharged during boring work, facilitate treatment and recycling of the discharged sludge, reduce the load of boring machine due to decrease in viscosity of a boring liquid, and furthermore, reduce the whole construction period and the cost of construction by shortening the measuring time of boring trajectory by means of a gyroscope which affects the construction time.SOLUTION: In a boring device 10 used for curved boring method, an air bubble liquid producing and feeding device 60 feeds air bubble liquid to a leading-end bit 40 through a boring pipe 20 and boring work is carried out while injecting the air bubble liquid around the front-end bit 40. In a step of inserting a gyroscope 30 into the boring pipe 20, a high-pressure fluid feeder, for example a compressed-air feeder 50, sends out high-pressure fluid, for example compressed air, into the boring pipe 20 to force-feed the gyroscope 30 toward the front-end part of the boring pipe 20.

Description

  The present invention relates to a curved boring method and a drilling device used therefor, for example, when drilling obliquely from the ground toward the bottom of a building and forming a chemical injection work hole below the building. It is related with the construction method and apparatus which are used for.

  In order to prevent liquefaction due to earthquakes, a boring boring method is known as a method of drilling diagonally from the ground toward the bottom of the building and forming a chemical injection hole below the building. Yes. In the conventional bending boring method, bentonite mud is used to prevent the collapse of the groove wall during excavation (see Patent Document 1). The technique described in Patent Document 1 supplies a drilling mud (bentonite mud) from a ground excavating mud pump to a nozzle provided at the tip of a drilling pipe, and this drilling mud (bentonite mud) ) Is injected from the nozzle at high pressure.

  Further, in the bending boring method, it is common to insert a gyroscope into the drilling tube in order to grasp the drilling locus of the drilling tube. For example, as a method of grasping the drilling trajectory by the drilling tube, after inserting the gyroscope to the vicinity of the tip in the drilling tube, pull out the gyroscope from the drilling tube while recording the signal from the gyroscope Thus, a method for measuring a drilling locus is disclosed (see Patent Document 2).

  The technique described in Patent Document 2 is provided with a male or female die of a torsion detecting device configured to be rotatable with respect to the gyroscope at the tip of the gyroscope, and at the tip of the drill rod. A female mold or a male mold of the twist detection device fixed to the hole direction determining member is provided. And rotating the male or female die at the tip of the gyroscope to engage the female or male die at the tip of the drilling rod, and detecting the angle at which the male or female die is rotated, Including a step of drawing the gyroscope from a point where the male and female dies of the detection device are engaged to a storage position on the ground side, and a step of recording a signal from the gyroscope and measuring a drilling locus at that time It is out.

JP 2009-41301 A Japanese Patent No. 3763399

  By the way, in the conventional bent boring method, as described above, bentonite mud is used to prevent the collapse of the groove wall during excavation. Had to be treated as industrial waste. This amount of mud soil is larger than the amount of excavated soil, which not only requires labor, but also increases industrial waste treatment costs.

  Also, in order to improve the drilling accuracy in the curved boring method, every time drilling of about 3m (for one drilling tube), after feeding the gyroscope into the drilling tube, the drilling trajectory is pulled out Must be detected. In the conventional bending boring method, the signal cable of the gyroscope is wound around a large reel. By rotating this reel, the gyroscope connected to the tip of the signal cable is fed into the drilling pipe, It was pulled out of the tube. Since such work requires a lot of time, there is a problem that the construction time is prolonged.

  The present invention has been proposed in view of the above-described circumstances, and is intended to reduce the amount of mud soil discharged during excavation, facilitate the treatment and reuse of the generated mud, and reduce the viscosity of the drilling fluid. It is possible to reduce the load on the excavating machine, and further reduce the construction cost by shortening the overall construction period by shortening the measurement time of the drilling locus using the gyroscope that affects the construction time It is an object of the present invention to provide a bending boring method that can be used, and a drilling device used therefor.

  In order to achieve the above-described object, the bending boring method and the drilling device used therefor according to the present invention have the following features. That is, the bending boring method of the present invention and the drilling device used therefor are a method and an apparatus for drilling by attaching a tip bit to the tip of a drilling tube and inserting it into the ground, and the tip bit is tapered. When drilling in a straight line, the hole is drilled while rotating the drill tube and the tip bit, and when drilling a curve, press the tube into the ground without rotating the drill tube and the tip bit. The curve is propelled by earth pressure acting on the tapered portion of the tip bit, and after inserting the gyroscope into the drilling pipe, the drilling locus is measured while the gyroscope is pulled out.

  In the drilling step, the bubble liquid is sent to the tip bit through the hole drilling tube, and the hole drilling is performed while injecting the bubble liquid around the tip bit. Further, in the step of inserting the gyroscope into the drilling tube, a high-pressure fluid is sent into the drilling tube and the gyroscope is pumped toward the tip of the drilling tube. The hole drilling device used in this bent boring method includes a bubble liquid creating machine for creating a bubble liquid and a bubble liquid sending machine for sending the bubble liquid into the hole drilling tube. Further, when the gyroscope is pumped toward the tip of the drilling tube by sending the high-pressure fluid into the drilling tube, a high-pressure fluid feeder is further provided for sending the high-pressure fluid into the drilling tube. Yes.

  In the bent boring method and the drilling device having such a configuration, a bubble liquid is injected around the tip bit instead of the bentonite mud used for preventing the groove wall collapse during excavation. The bubble liquid is, for example, a foamed mixture of an aqueous solution of a protein-based foaming agent or surfactant and air.

  Also, when measuring the drilling locus, after inserting the gyroscope into the drilling tube from the base end side of the drilling tube, attach a seal material around the signal cable at the base end of the drilling tube to cut the drilling track. The proximal end of the hole tube is sealed. Then, the gyroscope is pumped toward the tip of the drilling pipe by sending a high-pressure fluid into the drilling pipe using a high-pressure fluid delivery machine. In addition, the gyroscope is pulled out from the drilled pipe by winding the signal cable connected to the gyroscope with a winch. The high-pressure fluid is, for example, compressed air or high-pressure water. When sending compressed air, a compressor is used as the high-pressure fluid delivery machine. When sending high-pressure water, high-pressure fluid delivery is used. A pump is used as a machine.

  In the bent boring method of the present invention and the drilling device used therefor, by drilling while injecting the bubbling liquid, the amount of discharged mud soil is reduced and the generated mud is easily treated and reused. Furthermore, it becomes possible to reduce the load on the excavating machine due to the decrease in the viscosity of the drilling fluid. Further, when the gyroscope is inserted into the drilling tube, the bubble liquid serves as a lubricant and a buffer material, and the insertion load of the gyroscope is reduced, so that the insertion of the gyroscope is facilitated.

  Further, in the bending boring method of the present invention and the drilling device used therefor, the gyroscope is inserted into the drilled pipe by the pumping force of a high-pressure fluid such as compressed air or high-pressure water. Therefore, by extending the signal cable connected to the gyroscope as in the conventional technology, the gyroscope reaches the tip of the drilling tube quickly compared to inserting the gyroscope into the drilling tube. Can be made. For this reason, since the measurement time of the drilling locus | trajectory using the gyroscope which affects construction time can be shortened, the whole construction period is shortened and it becomes possible to reduce construction cost.

Schematic which shows the whole structure of the drilling apparatus which concerns on embodiment of this invention, and an attachment apparatus. Sectional drawing of a front-end | tip bit. Sectional drawing of the front-end | tip bit in the state which inserted the gyroscope. Explanatory drawing which shows the preparation procedure of bubble liquid.

  Hereinafter, with reference to the drawings, an embodiment of the bending boring method of the present invention and a drilling device used therefor will be described. FIGS. 1 to 3 illustrate a drilling device used in the bending boring method. FIG. 1 is a schematic diagram showing the overall configuration of the drilling device and an accessory device, FIG. 2 is a sectional view of a tip bit, and FIG. 3 is a gyro. It is sectional drawing of the front-end | tip bit in the state which inserted the scope. FIG. 4 is an explanatory diagram showing a procedure for creating the bubble liquid.

<Drilling device>
As the drilling device 10 used in the present invention, a conventionally known horizontal drilling device can be used. As shown in FIG. 1, the drilling device 10 is mounted on a base 11, a connection cutting device 12 for connecting and cutting the drilling tube 20, and the drilling tube 20. An angle adjusting device 13 for adjusting the insertion angle and a propulsion driving device 14 for propelling the drilled tube 20 are provided. A winch 15 for winding up the signal cable 31 connected to the gyroscope 30 is disposed behind the hole drilling device 10. Further, the hole drilling device 10 used in the present invention includes a compressed air delivery device 50, a bubble liquid production delivery device 60, and a foaming agent tank 61.

  The signal cable 31 of the gyroscope 30 used in the present invention is used to receive a signal from the gyroscope 30 and to pull out the gyroscope 30 from the drilled tube 20. On the other hand, the signal cable in the conventional bending boring method is used not only for these functions but also for feeding the gyroscope 30 into the drilled tube 20. Therefore, the signal cable 31 in the present embodiment is thinner than the conventional signal cable. For this reason, the winch 15 of this embodiment can be reduced in size compared with the reel used by the conventional bending boring method.

<Tip bit>
A tip bit 40 is attached to the tip portion of the drilling tube 20. As shown in FIGS. 2 and 3, the tip bit 40 has a tapered portion 44 whose tip is tapered, and the drilling tube 20 and the tip bit 40 are rotated during straight drilling. In the case of curved drilling, curved drilling is performed by press-fitting into the ground without rotating the drill tube 20 and the tip bit 40 and by earth pressure acting on the tapered portion 44 of the tip bit 40. Yes. 2 and 3, reference numeral 41 denotes a tip jig.

  Further, at the distal end portion of the distal end bit 40, a spout 42 for ejecting the bubble liquid that is transported through the hole drilling tube 20, and a spout for communicating the inside of the hole drilling tube 20 with the spout 42. A tube 43 is provided. During the drilling, the bubble liquid is sent from the bubble liquid creation / delivery machine 60 through the hole drilling pipe 20, and this bubble liquid is transferred from the spout 42 provided at the tip of the tip bit 40 to the periphery of the tip bit 40. Injected into the part. The bubble liquid after the injection is returned to the ground part through the gap between the drilling tube 20 and the ground.

<Bubble liquid production and delivery machine>
The bubble liquid production and delivery machine 60 is a device that has both a bubble liquid production function and a bubble liquid delivery function. It is supposed to be. Specifically, for example, by jetting high-pressure air into a foaming agent diluted with water, air can be mixed into the foaming agent to create a bubble liquid. Then, the bubbling liquid is fed into the drilling tube 20 by a compressor (not shown) that exhibits the bubbling liquid feeding function. In this embodiment, the apparatus has both the bubble liquid creation function and the bubble liquid delivery function. However, the apparatus (bubble liquid creation apparatus) having the bubble liquid creation function and the apparatus (bubble liquid delivery apparatus) having the bubble liquid delivery function. May be provided as separate devices. In the present embodiment, the foaming agent (diluent) is stored in the foaming agent tank 61.

<Creation of bubble liquid>
As described above, the bubbling liquid is created by injecting high-pressure air into the diluted foaming agent. Specifically, as shown in FIG. 4, a diluted foaming agent is prepared by diluting a foaming agent stock solution to a predetermined concentration (for example, a concentration about 100 times that of the foaming agent stock solution). Store in the foam tank 61. And by injecting high-pressure air into the diluted foaming agent, air is mixed into the diluted foaming agent, and a predetermined volume (for example, about 25 times the volume of the diluted foaming agent) Created. In addition, the preparation method of bubble liquid is not specifically limited, A well-known technique is applicable if it is the method of mixing air in a dilution foaming agent and generating a bubble.

<Antifoaming agent>
The bubble liquid injected into the ground is returned to the ground part through the gap between the drilling tube 20 and the ground. Therefore, the foam liquid can be separated into water and waste mud by mixing the antifoaming agent in the foam liquid returned to the ground part. In the present embodiment, the diluted foaming agent is foamed so as to have a volume of about 25 times by mixing air into the diluted foaming agent. Therefore, by mixing a defoaming agent into the bubble liquid returned to the ground part to eliminate the bubbles, the mixed bubble liquid can be returned to a volume of about 1/25. As an antifoamer, well-known antifoamers, such as a silicone type antifoamer, surfactant, polyether, a higher alcohol, can be used, for example.

<Compressed air delivery machine>
The compressed air delivery device 50 is a device that functions as a high-pressure fluid delivery device, and includes, for example, a known compressor. In order to pressure-feed the gyroscope 30 toward the distal end portion of the drilling tube 20 using the compressed air delivery device 50, first, the gyroscope 30 is inserted into the drilling tube 20 from the proximal end side of the drilling tube 20. After the insertion, a sealing material (not shown) is attached around the signal cable 31 at the base end portion of the hole drilling tube 20 to seal the base end portion of the hole drilling tube 20. When the high-pressure fluid is sent into the drilling tube 20 using the compressed air delivery device 50, the gyroscope 30 can be pumped toward the tip of the drilling tube 20.

<High pressure fluid>
The high-pressure fluid delivered into the drilling pipe 20 is not limited to compressed air, and high-pressure water can be used, or both compressed air and high-pressure water can be used in combination. When high-pressure water is used, a known pump may be used as a high-pressure fluid delivery device. When compressed air is used as a high-pressure fluid for pumping the gyroscope 30, the air injected into the ground returns to the ground surface through the gap between the drilled tube 20 and the ground and is diffused into the atmosphere. For this reason, the discharge amount of waste does not increase by the use of compressed air. On the other hand, when high-pressure water is used as a high-pressure fluid for pumping the gyroscope 30, the water injected into the ground returns to the ground surface through the gap between the drilling pipe 20 and the ground, and thus requires drainage treatment. However, high-pressure water has an advantage over the compressed air because the gyroscope 30 has a higher pumping capacity than the compressed air. Therefore, depending on various factors that affect the pumping of the gyroscope 30 such as the inner diameter and the degree of bending of the drilled tube 20, compressed air, high pressure water, compressed air and high pressure water are used. Appropriate construction can be performed by using them together. The pressures of the compressed air and high-pressure water sent into the drilling tube 20 can be set as appropriate according to the inner diameter of the drilling tube 20, the degree of bending, the size and weight of the gyroscope 30, and the like.

<Drilling method>
Next, the bending boring method of the present invention will be described.
In the bending boring method of the present invention, the drilling tube 20 is penetrated into the ground by the propulsion driving device 14 while the drilling tube 20 is connected by the connection / cutting device 12 of the drilling device 10 installed on the ground, and the tip bit is inserted. Drilling is carried out by 40. At this time, the bubbling liquid is created by the bubbling liquid creating and sending machine 60, and the bubbling liquid is sent to the tip bit 40 through the drilling tube 20. The bubble liquid is injected into the periphery of the tip bit 40 from a spout 42 provided in the tip bit 40.

  Then, the gyroscope 30 is inserted into the drilling pipe 20 as needed as the drilling progresses. At this time, the compressed air delivery device 50 sends compressed air into the bore tube 20 to pressure-feed the gyroscope 30 toward the tip bit. When the gyroscope 30 reaches the position of the tip bit 40, the direction of the tip bit 40 is detected by a rotation angle measuring mechanism (not shown).

  The rotation angle measuring mechanism may be any mechanism, for example, a fixed magnet portion is attached to the proximal end portion of the distal end bit 40 and a rotating magnet portion is rotatably attached to the distal end portion of the gyroscope 30. Thus, the rotation magnet unit can be brought close to the fixed magnet unit, and a rotation angle measuring device including a pulse encoder or the like can be used to detect the rotation angle of the rotation magnet unit.

  From this state, the signal cable 31 is wound up by the winch 15 and the pulling locus (drilling locus) of the gyroscope 30 is measured while the gyroscope 30 is pulled. The signal cable 31 of the gyroscope 30 and the signal cable (not shown) of the rotation angle measuring mechanism are connected to a computer (not shown), and the direction of the tip bit 40 and the pulling locus (cutting) of the gyroscope 30 are cut by the computer. Hole trajectory) is calculated and displayed on a display device or the like.

  Then, based on the measured direction of the tip bit 40, the subsequent drilling direction is predicted and displayed on a display device or the like. If the predicted direction of the tip bit 40 is different from the planned line, the direction of the tip bit 40 is controlled by rotating the drilling tube 20 and the tip bit 40 to determine the drilling direction. do it. At this time, the planned line displayed on the display device is also changed with the rotation of the drill tube 20 and the tip bit 40. In this way, it is possible to perform highly accurate drilling by correcting the drilling direction while measuring the drilling locus as needed as the drilling progresses.

  In the curved boring method of the present embodiment, the bubbling liquid mixed with excavated soil returns to the ground part along with the drilling, but the debris is removed by mixing the defoaming agent into the bubbly liquid and defoaming. Will occur. Although this waste mud is treated as industrial waste, the amount of waste mud soil that must be treated as industrial waste is significantly larger than when bentonite mud is used as the drilling fluid, as will be described in detail later. Reduced to

<Comparison with conventional technology>
In the bending boring method of the present invention and the hole drilling device used therefor, after the foaming agent is diluted to a predetermined magnification (about 100 times), the bubble liquid having a foaming ratio of about 25 times using the bubble liquid production and delivery machine 60 is used. Have created. For this reason, since the bubble liquid about 2500 times that of the foaming agent “1” can be created, the material cost can be reduced.

  In addition, a bubbling liquid is used as the hole drilling liquid instead of bentonite mud, but this bubbling liquid is generated by mixing air with a foaming agent (diluted foaming agent), and thus generated. By adding an antifoaming agent to the mud (bubble liquid), the original diluted foaming agent can be restored. For this reason, the amount of generated mud can be reduced by about 50 to 60% compared to bentonite mud.

  Further, by using the bubble liquid as the hole drilling liquid, the viscosity of the hole drilling liquid can be reduced, and the hole drilling speed can be increased. That is, since the bubble liquid has a lower viscosity than the bentonite mud water, the rotational torque of the hole drilling tube 20 is reduced and the hole drilling speed is increased.

  In addition, it is sandy soil (N <20 liquefied layer) that can be suitably applied to the conventional bending boring method, but in the present invention, it can be applied to hard ground due to the bearing effect of bubbles. Become.

  Moreover, since a foaming agent (bubble liquid) is a neutral chemical | medical agent, the quality of a ground improvement body (for example, chemical | medical solution injection improvement body) can be improved. Conventionally, bentonite mud used as a drilling fluid is alkaline, and there is concern about the quality of ground improvement bodies. In other words, pH control is very important for chemicals used for chemical injection, and if the pH balance is changed, a predetermined injection cannot be performed, and it becomes an irregular improvement rather than a spherical improvement. There was a case. On the other hand, in the present invention, since a neutral hole-pouring liquid (bubble liquid) is used, pH management becomes easy and a spherical improved body with good quality can be created.

DESCRIPTION OF SYMBOLS 10 Drilling device 11 Base 12 Connection cutting device 13 Angle adjustment device 14 Propulsion drive device 15 Winch 20 Drilling tube 30 Gyroscope 31 Signal cable 40 Tip bit 41 Tip jig 42 Jet outlet 43 Delivery tube 44 Taper part 50 Compressed air Dispenser 60 Bubble liquid production dispenser 61 Foaming agent tank

Claims (4)

A drilling method in which a tip bit is attached to the tip of a drilling tube and inserted into the ground to make a hole. The tip bit has a tapered taper portion, and at the time of straight drilling, Drilling while rotating the hole tube and the tip bit, and at the time of curve drilling, the soil that presses into the ground without rotating the hole tube and the tip bit and acts on the tapered portion of the tip bit In the curved boring method of measuring the drilling locus while pulling out the gyroscope after pushing the curve with pressure and inserting the gyroscope into the drilling tube,
A bending boring method characterized in that, in the hole making step, the bubble liquid is sent to the tip bit through the hole drilling tube, and the hole hole is drilled while injecting the bubble liquid around the tip bit.   2. The step of inserting the gyroscope into the drilling tube, sending a high-pressure fluid into the drilling tube and pumping the gyroscope toward the tip of the drilling tube. The bending boring method described. A drilling device that attaches a tip bit to the tip of a drilling tube and inserts it into the ground to make a hole, and the tip bit has a tapered taper portion. Drilling while rotating the hole tube and the tip bit, and at the time of curve drilling, the soil that presses into the ground without rotating the hole tube and the tip bit and acts on the tapered portion of the tip bit In the drilling device used in the bending boring method for measuring the drilling locus while pulling out the gyroscope after pushing the curve by pressure and inserting the gyroscope into the drilling tube,
A bubbling liquid creation machine that creates bubbling liquid
A bubble liquid delivery machine for delivering the bubble liquid into the drilling tube;
With
The bubbling liquid is created by the bubbling liquid creating machine, the bubbling liquid sending machine is used to send the bubbling liquid to the tip bit through the drilling tube, and the bubbling liquid feeding port provided in the tip bit is used to A drilling apparatus used for a bending boring method, wherein the drilling is performed while injecting the bubble liquid around a tip bit. A high-pressure fluid delivery device for delivering a high-pressure fluid into the drilling tube;
In the step of inserting the gyroscope into the drilling tube, the high-pressure fluid delivery device sends high-pressure fluid into the drilling tube and pumps the gyroscope toward the tip of the drilling tube. 4. A drilling device for use in the bending boring method according to claim 3.

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