JP4377763B2 - Curve drilling device - Google Patents

Description

  The present invention relates to a curved hole drilling device for drilling a curved hole.

The curved hole drilling device for drilling a curved hole includes a double pipe comprising an outer pipe formed with the same curvature as the curved hole and an inner pipe with a water jet attached to the front end. There is a configuration in which a curved hole is drilled by inserting a double pipe into the ground while digging the ground by injecting high-pressure water from a water jet arranged at the front end of the pipe (see, for example, Patent Document 1) ).
JP 2004-84363 A (paragraph 0005, FIG. 5)

Here, in the conventional curved hole drilling device, when adjusting the excavation direction in the ground, it is necessary to rotate the water jet around the axis to change the injection direction of the high-pressure water. Specifically, by rotating the entire inner tube around the axis, the water jet attached to the front end of the inner tube is rotated to adjust the injection direction.
However, since the inner tube of the conventional curved hole drilling device needs to be deformed along the bending of the outer tube, a flexible member is used, and the rear end of the inner tube is rotated around its axis. In this case, the inner pipe is twisted, so that it is difficult to rotate the water jet in the ground. Thus, the conventional curved hole drilling device has a problem that it is difficult to adjust the excavation direction.

  Furthermore, when drilling a curved hole in hard ground that cannot be excavated with high-pressure water, a drilling means having a cutting bit is provided at the front end of the inner pipe, and this drilling means is rotated together with the inner pipe. The ground will be excavated. However, as described above, in the conventional curved hole drilling device, the inner pipe is twisted, so it is difficult to rotate the hole drilling means with a large rotational torque. There is a problem that can not be excavated.

  Therefore, in the present invention, by solving the above-described problem and transmitting the rotational force of the shaft member to the hole drilling means without causing twisting of the shaft member in the outer tube formed with the same curvature as the curved hole, It is an object of the present invention to provide a curved hole drilling device capable of reliably rotating the hole drilling means at the front end portion of the outer tube.

In order to solve the above-mentioned problem, the invention according to claim 1 is a curved drilling device capable of drilling a curved hole, wherein the outer tube is formed with the same curvature as the curved hole, and the front end portion of the outer tube. The arranged drilling means , the drilling shaft which is a straight hollow tube whose front end is attached to the drilling means and can rotate around the axis in the outer tube, and the front end is the rear end of the drilling shaft are connected in a state of being refracted with respect to, and a extension shaft is a hollow tube rotatable linear around the shaft outside the tube, bevel gear provided on the periphery of the rear end opening of the drilling shaft The rear end gear is engaged with the front end gear, which is a bevel gear provided at the periphery of the front end opening of the extension shaft, whereby the rotational force of the extension shaft is transmitted to the drilling shaft and together with the drilling shaft. drilling means is arranged to rotate, in the interior of the drilling shaft and extension shaft and through the water supply pipe, a front end portion of the extension shaft is cut Guide member tubular projecting into the axial interpolated is water tube by passing through the guide member, it is characterized in that it is arranged over the extension shaft and drilling axis.

Here, drilling means corresponds to various soil types such as a cutter that cuts the ground with a cutting bit, a water jet that cuts the ground by jetting high-pressure water, or an air hammer that hits the ground and crushes the ground. Therefore, the configuration is not limited.
Further, the refraction angle between the rear end portion of the drilling shaft and the front end portion of the extension shaft is not limited as long as the drilling shaft and the extension shaft are bent at the connecting portion.

As described above, in the curved hole drilling device of the present invention, in the outer pipe formed with the same curvature as the curved hole, the linear drilling shaft and the extension shaft are connected in a refracted state, and the drilling shaft and the extension shaft are connected. Since the rotational force of the extension shaft is transmitted to the drilling shaft by engaging the gear, the drilling shaft and the extension shaft can be formed by a hard member, and the strength of the drilling shaft and the extension shaft can be increased. Can be bigger. Thereby, the drilling means arranged at the front end of the outer tube can be reliably rotated without causing twisting of the drilling shaft and the extension shaft.
Also, by increasing the strength of the drilling shaft and the extension shaft, a large rotational torque can be transmitted to the drilling means.
Further, by transmitting the rotational force by engaging the gears of the drilling shaft and the extension shaft, the rotation amount of the drilling shaft can be grasped based on the rotation amount of the extension shaft. The amount can be accurately grasped.
Further, in the gear mechanism using the bevel gear, when the two gears are engaged, the rotation center axes of the gears are arranged in different directions, and further, by changing the inclination angle of the tooth surface, The angle formed by the rotation center axis of the gear can be variously set. Since the front end gear and the rear end gear of each adjacent shaft are bevel gears, a gear mechanism for transmitting rotational force between the shafts connected in a refracted state can be simplified. The outer diameter of the outer tube can be reduced, and the manufacturing cost can be suppressed.
Further, since the liquid can be supplied to the drilling means through the inside of the drilling shaft and the extension shaft without providing a liquid water supply pipe in the space between the drilling shaft and the extension shaft and the outer pipe, The inside of the outer tube can be simplified.

  The invention according to claim 2 is the curved hole drilling device according to claim 1, wherein a plurality of extension shafts are connected to the drilling shaft in a state of being sequentially refracted, and the front extension is provided. The rear end gear provided at the rear end portion of the shaft is engaged with the front end gear provided at the front end portion of the rear extension shaft so that the rotational force is transmitted to each extension shaft. It is characterized by being.

  As described above, in the curved hole drilling device of the present invention, a plurality of extension shafts are connected in a state of being sequentially refracted, and a curved hole having various curvatures is cut by changing the refraction angle of each adjacent extension shaft. Can be perforated.

The invention according to claim 3 is the curved hole drilling device according to claim 1 or 2 , wherein the earth and sand excavated by the hole drilling means are discharged through the outer pipe. It is characterized by having.

  As described above, in the curved hole drilling device of the present invention, the earth and sand move smoothly by discharging the earth through the outer pipe as compared with the case of discharging the earth and sand around the outer pipe. Soil efficiency can be increased. This is effective when excavating hard ground.

According to such a curved hole drilling device, the linear drilling shaft and the extension shaft are refracted in the outer tube formed to have the same curvature as the curved hole, and the gears of the drilling shaft and the extension shaft are connected. Since the rotational force is transmitted, the drilling shaft and the extension shaft can be formed of a hard member, and the strength thereof can be increased. Accordingly, the drilling means arranged at the front end portion of the outer tube can be reliably rotated without causing twisting of the drilling shaft and the extension shaft, so that the drilling means can be easily controlled. , Drilling efficiency and drilling accuracy can be increased.
In addition, by increasing the strength of the drilling shaft and the extension shaft, a large rotational torque can be transmitted to the drilling means. Therefore, a cutting bit is provided in the drilling means, and this drilling means is rotated to rotate the hard ground. Can be excavated.
Furthermore, by engaging the gears of the drilling shaft and the extension shaft, the rotation amount of the drilling shaft can be grasped based on the rotation amount of the extension shaft, so that the rotation amount of the drilling means can be grasped. The excavation direction can be adjusted accurately.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a side view showing the curved hole drilling device of the present embodiment. FIG. 2 is a side sectional view showing a connecting portion of the curved hole drilling device of the present embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 showing the connecting portion of the curved hole drilling device of the present embodiment. FIG. 4 is a cross-sectional view showing a curved hole drilled by the curved drilling apparatus of the present embodiment.
In the following description, the front corresponds to the left side of FIG. 1, and the rear corresponds to the right side of FIG.
In the present embodiment, a curved hole drilling apparatus capable of drilling a curved hole having a diameter of about 80 to 200 mm and a radius of about 4 m will be described as an example.

[Curved hole drilling device]
First, as shown in FIG. 1, the curved hole drilling apparatus 1 includes an outer tube 2 formed in an arc shape, a hole drilling means 3 disposed at a front end portion of the outer tube 2, and a front end portion of the hole drilling unit 3. Is connected to the linear drilling shaft 10 that is rotatable around the axis within the outer tube 2 in a state where the front end portion is refracted with respect to the rear end portion of the drilling shaft 10. A linear extension shaft 20 rotatable around the shaft, and a plurality of other extension shafts 20 'are sequentially connected to the extension shaft 20 in a state of being refracted. The extension shaft 20 ′ is rotated around the axis by the driving device 4, and the rotational force is transmitted to the drilling shaft 10 through the extension shafts 20, 20 ′, so that the hole drilling means 3 together with the hole drilling shaft 10. It is configured to rotate.

[Outer tube]
As shown in FIGS. 1 and 4, the outer tube 2 is a hollow tube formed with the same curvature as the curved hole K to be constructed, and is a member left in the ground after the drilling operation is completed. The outer tube 2 is configured to correspond to the entire length of the curved hole K by sequentially adding hollow tubes of a predetermined length.
In addition, the joint structure of the hollow pipe which comprises the outer pipe | tube 2 is not limited, It can add by a bolt joint or welding.
Moreover, the outer tube | pipe 2 should just be provided with the intensity | strength of the grade which can maintain a predetermined curvature in the ground, The material is not limited.

[Hole drilling means]
As shown in FIG. 1, the hole drilling means 3 is a member having a circular cross section disposed in front of the front end portion of the outer tube 2 and having a central axis disposed in the digging direction. It is smaller than the inner diameter.
Further, a plurality of cutting bits 3a are attached to the front end face of the hole drilling means 3, and the ground can be excavated by the cutting bits 3a by rotating the hole drilling means 3 around the central axis.
Further, the hole drilling means 3 is formed with an opening for soil removal (not shown) penetrating in the axial direction, and the excavated earth and sand excavated at the front end surface of the hole drilling means 3 is the opening for soil removal. It is comprised so that it may be discharged to the back of the hole drilling means 3 through.
Furthermore, in the center of the hole drilling means 3, a drain hole 3b for discharging water to be poured into the face surface penetrates in the front-rear direction.

[Drilling shaft]
As shown in FIGS. 1 and 2, the drilling shaft 10 is a linear hollow tube that can rotate around the axis in the outer tube 2, and the drilling means 3 is attached to the front end, The drilling means 3 is configured to rotate together with the drilling shaft 10.
A rear end gear 11, which is a bevel gear, is formed on the periphery of the rear end opening of the drilling shaft 10.
The drilling shaft 10 only needs to have a strength that does not cause twisting when a rotational force for rotating the drilling means 3 is applied, and the material thereof is not limited.
Moreover, the structure which attaches the front-end part of the drilling shaft 10 to the drilling means 3 will not be specifically limited if an attachment state can be maintained at the time of excavation.

[Extension shaft]
As shown in FIGS. 1 and 2, the extension shaft 20 is a linear hollow tube that can rotate around the axis in the outer tube 2, and its front end portion is refracted with respect to the rear end portion of the drilling shaft 10. Connected.
Further, a plurality of other extension shafts 20 'are connected to the rear end portion of the extension shaft 20 in a state of being sequentially refracted, and a plurality (three in FIG. 1) of extension shafts 20 are provided in the outer tube 2. , 20 ′ are arranged.
The extension shaft 20 and the other extension shaft 20 ′ have the same configuration, and further, a connecting portion between the drilling shaft 10 and the extension shaft 20, a connecting portion between the extension shaft 20 and another extension shaft 20 ′, or Since the connecting portions of the other extension shafts 20 ′ and 20 ′ adjacent to each other have the same configuration, the following description will focus on the extension shaft 20 connected to the drilling shaft 10. The description of the connecting portion with the other extension shaft 20 ′ and the connecting portion of each of the adjacent other extension shafts 20 ′ and 20 ′ is omitted.
Further, the number of the extension shafts 20 and 20 ′ disposed in the outer tube 2 is not limited, and is set according to the length and curvature of the curved hole to be constructed, and corresponds to the progress of the drilling. They are connected sequentially.

The refraction angle of the extension shaft 20 with respect to the drilling shaft 10 is set corresponding to the curvature of the outer tube 2 so that the extension shaft 20 having a predetermined length is accommodated in the outer tube 2.
Further, a front end gear 21 that is a bevel gear is formed on the periphery of the front end opening of the extension shaft 20 so as to engage with the rear end gear 11 of the drilling shaft 10.
Thus, by engaging the rear end gear 11 having the inclined tooth surface and the front end gear 21, the drilling shaft 10 and the extension shaft 20 are connected in a state maintaining a predetermined refraction angle, A rotational force can be transmitted between the drilling shaft 10 and the extension shaft 20.
The extension shaft 20 only needs to have a strength that does not cause twisting when a rotational force for rotating the hole drilling means 3 is applied, and the material is not limited.

[Fitting pipe]
Further, as shown in FIGS. 1 and 2, in the connecting portion between the drilling shaft 10 and the extension shaft 20, the rear end portion of the drilling shaft 10 and the front end portion of the extension shaft 20 are inserted into the joint pipe 30. It is in the state.
Bearings 31 and 31 are interposed in the gap between the joint pipe 30 and the drilling shaft 10 or the gap between the joint pipe 30 and the extension shaft 20, and the drilling shaft 10 and the extension are provided by the bearings 31 and 31. The shaft 20 is rotatable around the shaft in the joint pipe 30.
Further, the inner peripheral surface of each bearing 31, 31 is engaged with the outer peripheral surface of the drilling shaft 10 or the extension shaft 20, and the outer peripheral surface of each bearing 31, 31 is engaged with the inner peripheral surface of the joint pipe 30. In addition, since the drilling shaft 10 and the extension shaft 20 are locked to the joint pipe 30, the drilling shaft 10 and the extension shaft 20 are prevented from being separated.

In addition, annular packings 32 are provided at both ends of the joint pipe 30 to prevent dirt and water from entering the gap between the drilling shaft 10 or the extension shaft 20 and the joint pipe 30. .
Further, as shown in FIGS. 2 and 3, an annular spacer 33 is provided at the connecting portion between the drilling shaft 10 and the extension shaft 20 so as to be detachably provided in the outer tube 2 before and after the connecting portion. It has been.
The spacer 33 includes a cylindrical mounting portion 33a externally fitted to the joint pipe 30 and a leg portion 33b extended from the mounting portion 33a so that a tip portion of the spacer 33 abuts on the inner peripheral surface of the outer tube 2. 4 legs 33b are provided at equal intervals in the circumferential direction. Thereby, the inside of the outer tube 2 is communicated between the leg portions 33b before and after the spacer 33.

[Water pipe]
As shown in FIGS. 2 and 3, the water supply pipe 5 passing through the inside of the drilling shaft 10 and the extension shaft 20 is disposed at the center of the outer pipe 2.
A front end portion of the water supply pipe 5 communicates with a drain hole 3b of the hole drilling means 3 (see FIG. 1), and a rear end portion protrudes from the outer pipe 2 and is connected to a water storage tank (not shown). . In this way, water can be supplied from the water storage tank to the drilling means 3 through the water supply pipe 5. It should be noted that a swivel (not shown) is interposed at the connecting portion between the hole drilling means 3 and the drain hole 3b of the water supply pipe 5, and when the hole drilling means 3 is rotated by providing this swivel. In addition, water can be supplied without rotating the water supply pipe 5.
Thus, in the curved hole drilling device 1 of the present embodiment, water is supplied to the hole drilling means 3 without arranging the water supply pipe 5 in the space between the hole drilling shaft 10 and the extension shaft 20 and the outer tube 2. Therefore, the inside of the outer tube 2 can be simplified.

Further, a guide member 6 for preventing damage to the water supply pipe 5 is inserted in the front end portion of the extension shaft 20.
The guide member 6 is a tubular member, and a front end portion thereof projects into the drilling shaft 10. Since the water supply pipe 5 is disposed across the drilling shaft 10 and the extension shaft 20 by passing through the guide member 6, the water supply pipe 5 is brought into contact with the rear end gear 11 or the front end gear 21. Damage is prevented.

[Driver]
The drive device 4 includes an output unit that can rotate the other extension shaft 20 ′ arranged at the rear end about the axis, and various existing devices can be used. Then, the rear end portion of the other extension shaft 20 ′ arranged at the rear end is attached to the output portion of the drive device 4, and the other extension shaft 20 ′ is rotated by the output of the drive device 4. It is transmitted to the drilling shaft 10 via the extension shafts 20 and 20 ′, and the drilling means 3 is configured to rotate together with the drilling shaft 10.

Thus, in the curved hole drilling device 1 of the present embodiment, the linear drilling shaft 10 and the extension shafts 20 and 20 ′ arranged in the outer tube 2 formed with the same curvature as the curved hole are refracted. Since the rotational force of the extension shafts 20, 20 ′ is transmitted to the drilling shaft 10 by engaging the gears of the adjacent shafts 10, 20, 20 ′ in the state and engaging the gears of the adjacent shafts 10, 20, 20 ′, The extension shafts 20, 20 ′ can be formed of a hard material, and the strength of the shafts 10, 20, 20 ′ in the outer tube 2 can be increased. Thereby, the drilling means 3 provided at the front end portion of the outer tube 2 can be reliably rotated without causing the shafts 10, 20, and 20 ′ in the outer tube 2 to be twisted.
In addition, since a large rotational torque can be transmitted to the drilling means 3 by increasing the strength of the drilling shaft 10 and the extension shafts 20 and 20 ', the drilling means 3 provided with the cutting bit 3a is hard. The ground can be excavated.
Further, by making the rear end gear 11 and the front end gear 21 of the adjacent shafts 10, 20, and 20 ′ bevel gears, a rotational force is generated between the shafts 10, 20, and 20 ′ connected in a refracted state. The gear mechanism for transmission can be simplified, the outer diameter of the outer tube 2 can be reduced, and the manufacturing cost of the curved hole drilling device 1 can be suppressed.

Next, the drilling operation of the curved hole using the curved drilling apparatus 1 of the present embodiment will be described.
Here, a case where a curved hole is drilled along the outer shape of the notch portion in order to widen the side wall of the tunnel by notching it in an arc shape will be described as an example.

First, as shown in FIG. 1, the drilling means 3 is arranged at the front end portion of the arc-shaped outer tube 2 formed with the same curvature as the curved hole K to be constructed (see FIG. 4), and the rear end of the outer tube 2 The front end portion of the drilling shaft 10 inserted from the portion is attached to the drilling means 3.
Further, the rear end portion of the drilling shaft 10 is attached to the output portion of the driving device 4 so that the drilling shaft 10 can rotate around the shaft by the output of the driving device 4.
Further, the water supply pipe 5 is inserted into the drilling shaft 10, and the front end portion of the water supply pipe 5 is communicated with the drainage hole 3b (see FIG. 1) of the drilling means 3 through a swivel (not shown). The rear end portion protrudes from the outer tube 2 and is connected to a water storage tank (not shown).

Subsequently, as shown in FIG. 1, the hole drilling means 3 is brought into contact with the position that is the starting point of the curved hole K, the driving device 4 is started, and the hole drilling shaft 10 is rotated around the axis, thereby drilling the hole. The ground is excavated by means 3.
Further, by supplying water from the water supply pipe 5 to the drilling means 3 and pouring water into the face surface from the drainage hole 3b of the drilling means 3, the ground hardness can be lowered, so that excavation efficiency can be improved. it can.
Further, the excavated earth and sand is taken into the outer pipe 2 from the opening for earth removal (not shown) of the hole drilling means 3, and passes through the space between the hole drilling shaft 10 and the outer pipe 2 to the rear of the outer pipe 2. It is discharged from the end. Thereby, compared with the case where earth and sand are made to flow around the outer pipe 2 and discharged, the excavated earth and sand can be discharged smoothly.
In this manner, the ground is excavated by the hole drilling means 3 so that the drilling shaft 10 and the outer tube 2 are dug into the ground along the curvature of the curved hole K.

Then, after drilling to the rear part of the drilling shaft 10 and once stopping the rotation of the drilling shaft 10, the extension shaft 20 is inserted from the rear end part of the outer tube 2, and the front end gear 21 at the front end part is drilled. By engaging with the rear end gear 11 of the shaft 10, the front end portion of the extension shaft 20 is connected in a refracted state with respect to the rear end portion of the drilling shaft 10.
As shown in FIG. 2, a spacer 33 is attached to the joint pipe 30, and in this state, the joint pipe 30 and the spacer 33 are arranged around the connecting portion between the drilling shaft 10 and the extension shaft 20. Further, the water supply pipe 5 is disposed inside the extension shaft 20.
On the other hand, the rear end portion of the extension shaft 20 is attached to the output portion of the drive device 4 so that the extension shaft 20 can rotate around the shaft by the output of the drive device 4.

Subsequently, the ground is excavated by the drilling means 3 by starting the driving device 4 and rotating the extension shaft 20 around the axis.
Here, in the curved hole drilling device 1 of the present embodiment, the gears of the linear hole shaft 10 and the extension shaft 20 connected in a refracted state are engaged to rotate between the shafts 10 and 20. Since the force is transmitted and the strength of the shafts 10 and 20 in the outer tube 2 can be increased, a large rotational torque can be transmitted to the hole drilling means 3 provided at the front end of the outer tube 2. The hard ground can be reliably excavated by the drilling means 3 provided with the cutting bit 3a.

Further, a communication opening 33 a is formed in the spacer 33 provided at the connecting portion between the drilling shaft 10 and the extension shaft 20, and the front and rear of the spacer 33 communicate with each other. The soil can be discharged smoothly without clogging.
Then, by drilling the ground with the drilling means 3, the drilling shaft 10, the extension shaft 20 and the outer tube 2 are dug into the ground along the curvature of the curved hole K.

Further, as the drilling shaft 10, the extension shaft 20 and the outer tube 2 are dug, another extension shaft 20 'is sequentially connected to the rear end portion of the extension shaft 20, and the outer tube 2 is sequentially added to extend. To do. In this way, the drilling shaft 10, the extension shafts 20, 20 ′ and the outer pipe 2 are dug while extending, and a curved hole K is constructed as shown in FIG. 4.
Thereafter, the drilling means 3, the drilling shaft 10 and the extension shafts 20 and 20 'are pulled out from the outer tube 2 and collected (see FIG. 1) to leave the outer tube 2 in the ground.

Further, similarly, a plurality of curved holes K are arranged side by side in the extending direction of the tunnel, and the notch portion T sandwiched between the curved holes K and the side wall surface of the tunnel is removed, thereby removing the tunnel side wall. Widen. At this time, since the outer shape of the cutout portion T to be removed is edged by a plurality of curved holes K, the side surface of the tunnel can be easily cut out and widened.
In this way, since the side wall of the tunnel can be widened, a shelter, an evacuation passage, or a branch junction of roads can be constructed in the tunnel using the curved hole drilling device 1.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.
FIG. 5 is a side view showing another configuration of the present embodiment, in which the cross section of the hole drilling means is formed substantially the same as the front end surface of the outer tube. FIG. 6 is a view showing another configuration of the curved hole drilling device of the present embodiment, and is a side view of a configuration using a water jet.

For example, in the present embodiment, as shown in FIG. 1, the drilling means 3 formed smaller than the inner diameter of the outer tube 2 is used, but as shown in FIG. 5, the cross section is the front end surface of the outer tube 2. Alternatively, a hole drilling means 3 ′ having substantially the same diameter may be used.
Also in this configuration, the configuration for attaching the front end portion of the drilling shaft 10 to the drilling means 3 'is not particularly limited, but a curved hole with one end closed is constructed, and the drilling shaft 10 and the extension shaft are constructed. Since the drilling means 3 'cannot pass through the outer pipe 2 when the 20 is pulled out from the outer pipe 2, the drilling shaft 10 and the extension shaft 20 are left in a state where the drilling means 3' is left in the ground. Needs to be pulled out from the outer tube 2.
Therefore, in order to cope with such a case, in the above-described configuration, the male screw formed at the front end portion of the drilling shaft 10 is screwed to the female screw formed in the drilling means 3 ′, and the screw is tightened during excavation. By rotating the drilling shaft 10 in the direction to be rotated, the screwed state between the drilling means 3 and the drilling shaft 10 is maintained. When removing the drilling shaft 10 from the drilling means 3 ′, the drilling shaft 10 is rotated in the direction opposite to the direction of rotation during excavation, that is, in the direction in which the screw is loosened. The screwing with the hole shaft 10 can be released.

  In the present embodiment, as shown in FIG. 1, the ground is excavated by the drilling means 3 having a plurality of cutting bits 3a. However, when the curved hole K is drilled in the soft ground, FIG. As shown in the side view, a hole drilling means 4 using a water jet may be used. In the hole drilling means 4 by this water jet, the ground is cut by jetting high-pressure water onto the face, and when adjusting the excavation direction, the hole drilling means 4 is rotated around the central axis and jetted. Need to change direction.

At this time, in the curved hole drilling device 1 of the present embodiment, by engaging the gears 11, 21 of the linear shafts 10, 20, 20 ′ arranged in the outer tube 2, the shafts 10, 20 are engaged. , 20 ′, and the rotation amount of the drilling shaft 10 can be grasped based on the rotation amount of the other extension shaft 20 ′ arranged at the rearmost position. The amount of rotation of the drilling means 4 can be grasped, and the excavation direction of the drilling means 4 can be adjusted accurately.
When excavating the soft ground, the excavated soil can be drained around the outer pipe 2, and it is not necessary to drain through the outer pipe 2. , 20 ′, the outer tube 2 does not need to be communicated with the spacer 33 (see FIG. 2), and the outer diameter of the outer tube 2 can be reduced.

  Further, the hole drilling means 3 is not limited to a configuration in which the ground is cut by the cutting bit 3a (see FIG. 1) or a configuration in which the ground is cut by jetting high-pressure water (see FIG. 5). Thus, it can be appropriately selected according to various soil properties such as an air hammer for crushing the ground. When the hole drilling means 3 is constituted by an air hammer, a compressed air supply pipe can be disposed inside the hole drilling shaft 10 and the extension shafts 20 and 20 '.

  Further, in the curved hole drilling device 1 shown in FIGS. 1, 5 and 6, the inclination angles of the tooth surfaces of the gears 11 and 21 provided on the hole drilling shaft 10 and the extension shafts 20 and 20 ′ are changed. By changing the angle formed by the shafts 10, 20, and 20 ', curved holes with various curvatures can be drilled. Further, the curvature of the curved hole need not be constant, and an elliptical curved hole can be constructed.

  Furthermore, although this embodiment demonstrated as an example the case where the curved hole drilling apparatus 1 was used for the operation | work which widens the side wall of a tunnel, the curved hole drilling apparatus 1 of this invention is used for the various construction which constructs a curved hole. be able to. For example, a curved hole 4 (see FIG. 4) is constructed by using the curved hole drilling device 1, and a solidifying agent is injected into the outer pipe 2 left in the ground, whereby a plurality of pre-formed outer pipes 2 are formed. It is also possible to improve the ground by injecting a solidifying agent into the ground through the through hole. Moreover, when the antifreezing agent is injected into the ground instead of the solidifying agent, the freezing of the ground can be prevented.

It is the side view which showed the curve drilling apparatus of this embodiment. It is the sectional side view which showed the connection part of the curved hole drilling apparatus of this embodiment. It is AA sectional drawing of FIG. 2 which showed the connection part of the curved hole drilling apparatus of this embodiment. It is sectional drawing which showed the curved hole drilled with the curved hole drilling apparatus of this embodiment. It is the figure which showed the other structure of this embodiment, and is a side view of the structure by which the cross section of the drilling means was formed substantially the same as the front end surface of an outer tube | pipe. It is the figure which showed the other structure of the curved hole drilling apparatus of this embodiment, and is a side view of the structure using a water jet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curve drilling apparatus 2 Outer pipe 3 Drilling means 10 Drilling shaft 11 Rear end gear 20 Extension shaft 20 'Other extension shaft 21 Front end gear K Curved hole

Claims (3)

A curve drilling device capable of drilling a curved hole,
An outer tube formed in the same curvature as the curved hole;
Drilling means disposed at the front end of the outer tube;
A drilling shaft which is a linear hollow tube having a front end attached to the drilling means and rotatable around the axis in the outer tube;
An extension shaft that is connected in a state where the front end portion is refracted with respect to the rear end portion of the drilling shaft, and is a linear hollow tube that is rotatable around the axis within the outer tube,
By engaging a rear end gear that is a bevel gear provided at the periphery of the rear end opening of the drilling shaft and a front end gear that is a bevel gear provided at the periphery of the front end opening of the extension shaft. , The rotational force of the extension shaft is transmitted to the drilling shaft, and the drilling means rotates with the drilling shaft ,
A water supply pipe passes through the bore shaft and the extension shaft,
A tubular guide member projecting into the drilling shaft is inserted into a front end portion of the extension shaft, and the water supply pipe passes through the guide member, so that the drilling shaft and the extension shaft are connected. Curved hole drilling device characterized by being arranged across . A plurality of the extension shafts are connected to the drilling shaft in a state of being sequentially refracted,
By engaging a rear end gear provided at the rear end portion of the front extension shaft and a front end gear provided at the front end portion of the rear extension shaft, a rotational force is transmitted to each extension shaft. The curved hole drilling device according to claim 1, wherein the curved hole drilling device is configured as described above. The curved hole drilling device according to claim 1 or 2 , wherein the earth and sand excavated by the hole drilling means is configured to be discharged through the outer pipe.

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