JP5437843B2 - Double tube drilling device swivel adapter, double tube drilling device swivel, and drilling method - Google Patents

Description

The present invention relates to a double-pipe drilling device swivel adapter, a double-pipe drilling device swivel, and a drilling method, and in particular, the stroke between the down-the-hole hammer and the swivel extension does not interfere with the rocky soil. The present invention relates to a double pipe drilling device swivel adapter, a double pipe drilling device swivel, and a drilling method that enable continuous drilling even in soil layers mixed with soft soil.

  The double-pipe drilling method using rotary percussion is a method of drilling by attaching a drill bit to the tips of the inner rod and outer rod, respectively, and transmitting the percussion motion and rotational motion of the rotary percussion. A swivel is interposed between the rotary percussion and both rods, and drilling water and drilling mud are drained (air may be sent). This double pipe drilling method is particularly effective for drilling soft soil.

  On the other hand, in the case of rocky soil, a down-the-hole hammer that strikes and drills rock is effective. This enables efficient rock drilling by air pressure and striking reaction to the rock.

  Here, the soil is not limited to soft soil or only rocky soil, and there are many situations where drilling is necessary in a place where these soils are mixed. In particular, it is unpredictable when the depth of drilling becomes deeper or the distance from the previous boring point becomes soft or rocky soil or rocky or soft soil.

  Accordingly, there is a case where a method of drilling by mounting a down-the-hole hammer at the inner rod tip and a drill bit at the outer rod tip may be employed. According to this, both soft and rocky soils can be handled.

However, the conventional technique has the following problems.
Down-the-hole hammers are originally drilling devices that are independent of rotary percussion and operate independently. Accordingly, there is a problem that the excavation operation is not stable due to the relationship between the impact amplitude and impact frequency of the rotary percussion and the impact amplitude and impact frequency of the down-the-hole hammer, and the down-the-hole hammer and the inner rod may be damaged. Here, damage is not caused if the down-the-hole hammer is increased in strength such as increasing the thickness of the casing, but the specifications of the rotary percussion are various and there is no universal thickness. In addition, the thicker the thickness, the higher the strength, but there is an outer rod on the outside of the inner rod, and a gap for passing drilling mud, crushed gravel, etc. is required, so there is a situation that the thickness cannot be increased. .

  In addition, the driving efficiency of the down-the-hole hammer is increased by the striking reaction, so that in the case of soft soil, there is a problem that the effective striking reaction is not obtained and the excavation efficiency is difficult to increase.

  In addition, some rotary percussion can stop the batting operation and transmit only the rotational motion. However, the outer rod does not rotate in rocky soil, and even if it rotates, there is no hitting. Therefore, there is a problem that the excavation efficiency is not good because the inner down-the-hole hammer cannot be excavated. In such a case, pull out the rod and drill with the outer rod diameter down-the-hole hammer, then pull out the set of rods, and drill again twice while protecting the hole with the drill bit in the outer rod. There was a problem that a construction method with poor drilling efficiency was adopted.

JP 2000-87676 A JP 2001-173358 A JP 2002-21461 A JP 2003-239672 A

  In other words, the problem to be solved is to use a general-purpose rotary percussion, a general-purpose swivel and a general-purpose down-the-hole hammer, even if the soil is a mixture of soft soil and rock soil, It is a point that continuous drilling is realized without the need to attach / detach the hole bit or down-the-hole hammer.

  An adapter according to claim 1 is a double pipe having an extension for connecting an inner rod, a coupling for connecting an outer rod, and a drill head for transmitting a rotary motion and a striking motion of a rotary percussion to the extension and the coupling. An adapter to be attached to the tip of a swivel for a hole drilling device, which is screwed into an outer rod screw groove of a coupling and extends in the axial direction. An outer rod screw groove is provided at the tip, and a rotary is provided on the side periphery. Cylindrical base with a hole with a predetermined width longer than the percussion striking stroke length, inserted into the cylindrical base at a position ahead of the extension tip, and provided with an inner rod threading groove at the tip Cylindrical inner rod assembly and inner rod so that the shaft center of the inner rod does not deviate from the shaft center of the outer rod. An inner rod holding body for holding the coalescence from the outer side of the cylindrical base body, the swivel outer side or the rotary percussion, and a holding arm extending from the inner rod holding body and joined to the inner rod joined body through the hole portion, Of the turning motion and striking motion of the drill head, only the turning motion is transmitted to the inner rod assembly.

That is, in the invention according to claim 1, since the inner rod does not directly attach to the extension, it floats stably, the striking stroke is not transmitted to the inner rod, and the turning force is transmitted, so that the down-the-hole hammer can be adopted at the tip of the inner rod. This enables effective drilling with a drill bit at the outer rod tip in the case of soft soil, and effective drilling with down-the-hole hammers in rocky soil, even if the soil changes. Continuous drilling that eliminates the need for rod insertion and removal and replacement of the drill bit or down-the-hole hammer is possible.
In addition to the striking motion and the rotational motion, the rotary percussion is pushed in the direction of the hole and drilled. Of course, this propulsive force is also transmitted to the inner rod assembly.

  The cylindrical substrate can be a hollow cylinder, for example. The number of holes is not limited to one, and from the viewpoint of holding stability of the inner rod assembly or the inner rod itself, it is preferable to open a plurality of locations (two places, three places, four places, etc.) in rotational symmetry. Depending on the down-the-hole hammer, the axial length of the hole may be the length of the stroke length of the rotary percussion + the actual stroke length of the down-the-hole hammer.

  In addition, the position beyond the extension tip means that the entire inner rod assembly is physically separated, and for example, a hole having a diameter larger than the extension tip is formed on the base end side of the inner rod assembly. It is assumed that a mode of being provided and inserted and not interfering (not touching) is also included.

  Further, the outer side of the cylindrical base or the outer side of the swivel means that the outer side of each inner peripheral surface is outside, and depending on the mode of use, a groove is provided in the thick portion, and the inner rod holder slides the groove to move the inner part. A configuration that does not fly to the outer peripheral side that holds the rod may be used. In addition, it is assumed that the drilling mud, crushed gravel and the like are not leaked in the hole portion.

  In the adapter according to claim 2, in the adapter according to claim 1, when the inner rod holder is provided outside the cylindrical base body or outside the swivel, the inner rod holder is extrapolated to the cylindrical base body or swivel. It is characterized by being a cylinder or a ring.

  That is, the invention according to claim 2 can hold the inner rod holder more stably. In addition, you may make it a part which contacts a cylindrical base | substrate and a swivel slide smoothly with an appropriate bearing.

Double pipe drilling apparatus swivel according to claim 3, characterized in that integrated adapter according to 請 Motomeko 1 or 2.

  In other words, the invention according to claim 3 can provide a novel swivel, which enables suitable combined excavation or continuous excavation using the down-the-hole hammer and excavation bit.

According to a fourth aspect of the present invention, in the drilling method, the double tube drilling device swivel is connected to the rotary percussion and the adapter according to the first or second aspect is attached thereto, or the rotary percussion is described in the third aspect. A double pipe drilling device swivel is attached, and an inner rod and an outer rod are connected, a down-the-hole hammer is attached to the inner rod tip, and a drill bit is attached to the outer rod tip for drilling. And

  That is, according to the invention according to claim 4, even in a place where soft soil and bedrock are alternately laminated, in the case of a soft layer, effective drilling can be realized by the drill bit at the tip of the outer rod, In the case of rocky layers (hard layers), effective drilling can be achieved with down-the-hole hammers, and continuous drilling is possible without the need to insert / remove rods or replace drill bits or down-the-hole hammers even when soil conditions change. It becomes possible.

  According to the present invention, it is possible to realize continuous drilling that does not require insertion / removal of rods or mounting / dismounting of a drill bit or down-the-hole hammer even if soil quality changes.

It is the figure which showed the schematic diagram of the drilling system of this Embodiment equipped with the adapter which is this invention. It is the fragmentary sectional view which showed the swivel, the adapter, and the rod and the joining state among the drilling systems of this Embodiment. It is the fragmentary sectional view which showed the swivel terminal part, the adapter, and the rod and the joining state among the drilling systems of this Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a schematic diagram of a drilling system of the present embodiment in which an adapter according to the present invention is mounted. The right half is a cross-sectional view below the middle of the swivel. FIG. 2 is a partial cross-sectional view showing a joined state of the swivel, the adapter, and the rod. FIG. 3 is a partial cross-sectional view showing a joined state of the swivel end portion, the adapter, and the rod. In each figure, for convenience of explanation, the scale is changed as appropriate, and a part of the configuration is omitted.

  The drilling system 1 includes a rotary percussion 2, a swivel 3, an adapter 4, an inner rod 5, an outer rod 6, a down-the-hole hammer 7, and a drill bit 8 as main components.

  The swivel 3 mainly includes a drill head 31, a coupling 32, an extension 33, and a swivel case 34. The swivel 3 supplies drilling water to the inner rod 5, cools both rods, and pushes and discharges drilling earth and sand and crushed gravel. And each part is as follows. The drill head 31 transmits a striking motion, a rotational motion and a push-in from the rotary percussion 2 in the distal direction. The coupling 32 is provided with a screw 32a capable of screwing the outer rod 6 at the tip thereof. The extension 33 is provided with a screw 33a capable of screwing the inner rod 5 at its tip. Note that the coupling 32 and the extension 33 may be integrated, or may be in a relationship of pivoting with respect to the other party.

  The swivel case 34 is rotatably inserted in the coupling 32 and discharges the earth and sand and crushed gravel excavated from between the water feed port 34 i for supplying the drilling water to the inner rod 5 and between the inner rod 5 and the outer rod 6. And a discharge port 34o. In the figure, the water supply / drainage mechanism is not shown.

  Next, the adapter 4 will be described. The adapter 4 mainly includes an outer rod joint 41, an inner rod joint 42, an outer holder 43, and a holding arm 44.

  The outer rod joint 41 has a cylindrical shape, is screwed into the screw 32a of the coupling 32 and extends in the axial direction, and a screw 41a for joining the outer rod 6 is provided at the tip. The screw 41a and the screw 32a are basically the same pitch, but it is possible to increase the choice of the outer rod by changing the diameter and the pitch. In the present embodiment, it is assumed that the outer periphery of the outer rod joint 41 and the outer periphery of the coupling 32 constitute a cylinder that is joined without a step so that the surfaces are aligned.

  On the side periphery of the outer rod joint 41, four longitudinal holes 41b having a length equal to or longer than the striking stroke length of the rotary percussion 2 are formed in four axially symmetrical directions (90 ° rotational symmetry). The shape of the hole is not particularly limited, and may be an oval shape such as a motion track or a rectangle. As will be described later, since the vertically long hole 41 b is provided, it is realized that the inner rod joint 42 does not interfere with the striking motion of the outer rod joint 41 and the extension 33. On the other hand, the holding arm 44 comes into contact with the long side 41bl of the hole 41b, and the rotational movement of the outer rod joint 41 can be transmitted to the inner rod joint 42.

  The inner rod joint 42 has a cylindrical basic shape and is inserted at a position ahead of the tip of the extension 33 in the outer rod joint 41. A screw 42 a capable of screwing the inner rod 5 is provided at the tip of the inner rod joint 42. The diameter and pitch of the screw 42a are basically the same as the diameter and pitch of the extension 33. However, it is possible to increase the number of options for the inner rod by making different.

  The outer holder 43 is extrapolated to a side peripheral portion of the outer rod joint 41 and the coupling 32 so that the inner rod 5 does not fluctuate, that is, the axial center of the inner rod 5 does not deviate from the axial center of the outer rod 6. The inner rod joint 42 is held via the holding arm 44. Here, in order to hold stably, the length of the outer holder 43 in the axial direction is set to a predetermined length.

  The holding arm 44 joins the outer holder 43 and the inner rod joint 42 to form a rigid body. The holding arm 44 passes through the hole 41 b to connect the inner rod joint 42 inside the outer rod joint 41 and the outer outer holder 43. The holding arm 44 hits the long side 41bl of the hole 41b, and the inner rod joint 42 rotates following the rotational movement of the outer rod joint 41. In addition, although illustration is abbreviate | omitted, the hole 41b part shall be sealed etc. so that excavation mud, crushed gravel, etc. may not leak.

  Since the adapter 4 has the above-described configuration, the inner rod 5 is not directly attached to the extension 33, and the inner rod joint 42 does not interfere with the extension 33. In addition, although the stroke of the rotary percussion 2 is directly transmitted to the outer rod 6 by the hole 41b, it is not transmitted to the inner rod 5, but on the contrary, the rotational force from the rotary percussion 2 is directly transmitted to the outer rod 6 to cause the holding arm 44 to move. To the inner rod 5 indirectly.

  Therefore, even if the down-the-hole hammer 7 is attached to the tip of the inner rod 5 and driven, the blow of the rotary percussion 2 is not transmitted, so that the down-the-hole hammer 7 (and the inner rod 5) can be excavated without being damaged. On the other hand, since both the impact and rotation of the rotary percussion 2 act on the outer rod 6, the operating efficiency of the drill bit 8 at the tip does not decrease, and even if the soil quality changes in cooperation with the down-the-hole hammer 7. Continuous drilling is possible without the need for double digging or insertion / extraction. Further, since the down-the-hole hammer 7 rotates, this further increases the drilling efficiency. That is, according to the present invention, a general-purpose excavation system can be easily changed to a more efficient excavation apparatus.

  The present invention is not limited to the embodiment described above. For example, the outer holder 43 has a cylinder shape, but may have a ring shape as long as the inner rod joint 42 is stably held. At this time, a groove is formed on the side peripheral surface of the outer rod joint 41, a protrusion that fits into the groove is provided on the inner side of the ring shape of the outer holder 43, and the outer holder 43 slides along the groove. Also good. Further, the outer holder 43 may be attached to the end portion of the rotary percussion 2. In this case, you may make it interpose a bearing suitably so that rotation is possible.

  In the above example, the inner rod 5 and the swivel 3 are separate bodies, but may be integrated with the swivel. In this case, the degree of freedom in design is high, and the water conductivity of the extension 33 to the inner rod joint 42 of the drilling water can be further increased.

  As a method of feeding the drilling water or air from the extension 33 to the inner rod joint 42, an embodiment in which both are connected by a bellows hose or the like can be mentioned. Thereby, the striking movement can be substantially not transmitted.

  According to the present invention, a general-purpose swivel 3 is connected to a general-purpose rotary percussion 2, an adapter 4 is attached to the general-purpose rotary percussion 2, and a general-purpose inner rod 5 and a general-purpose outer rod 6 are connected to the adapter 4. A general-purpose down-the-hole hammer 7 is attached to the tip of 4 and a drill bit 8 is attached to the tip of the outer rod 6 to enable efficient continuous excavation.

DESCRIPTION OF SYMBOLS 1 Drilling system 2 Rotary percussion 3 Swivel 4 Adapter 5 Inner rod 6 Outer rod 7 Down the hole hammer 8 Drilling bit 31 Drill head 32 Coupling 32a Screw 33 Extension 33a Screw 34 Swivel case 34i Water supply port 34o Outlet 41 Outer rod joint 41a Screw 41b Hole 41bl Long side 42 Inner rod joint 42a Screw 43 Outer holder 44 Holding arm

Claims (4)

Attached to the tip of a swivel for double tube drilling equipment that has an extension for connecting the inner rod, a coupling for connecting the outer rod, and a drill head that transmits the rotary percussion turning and striking motion to the extension and the coupling. An adapter to
The outer rod screw groove is coupled to the coupling outer groove and extends in the axial direction. The outer rod screw groove is provided at the tip, and a hole having a predetermined width longer than the percussion stroke length of the rotary percussion is provided on the side periphery. An opened cylindrical substrate; and
A cylindrical inner rod assembly that is inserted into the cylindrical base body at a position ahead of the extension tip, and is provided with an inner rod threading groove at the tip;
An inner rod holding body for holding the inner rod joined body from the outer side of the cylindrical base body, the swivel outer side, or the rotary percussion so that the axis center of the inner rod does not deviate from the axis center of the outer rod;
A holding arm extending from the inner rod holder and joined to the inner rod assembly through the hole portion;
Comprising
Of the pivoting motion and the striking motion of the drill head, an adapter that transmits only the pivoting motion to the inner rod assembly.   The inner rod holder is provided as a cylindrical body or an annular body that is extrapolated to the cylindrical base body or the swivel when the inner rod holder is provided outside the cylindrical base body or the swivel side. adapter. 請 Motomeko 1 or 2 double pipe drilling apparatus swivel, characterized in that with an integrated adapter according to. A double tube drilling device swivel is connected to the rotary percussion, and the adapter according to claim 1 or 2 is attached thereto,
Or
A rotary percussion is mounted with the swivel for a double pipe drilling device according to claim 3,
Furthermore, connect the inner rod and outer rod,
A drilling method characterized by mounting a down-the-hole hammer at the inner rod tip and drilling by mounting a drill bit at the outer rod tip.

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