Drilling rig extension, drilling rig, and drilling unit

Abstract

To provide a drilling rig extension that, compared to conventional extensions used in a drilling rig, promotes the discharge of soil and other materials generated inside a borehole during drilling operations, thereby improving work efficiency; a drilling rig comprising this extension; and a drilling unit.SOLUTION: A drilling rig extension 4 used in a drilling unit 1 comprises: a joint part 41 provided at one end of an elongated cylindrical body part 40; a mating joint part 42 provided at the other end; a cylindrical air channel part 43, connected to each of the joint part 41 and the mating joint part 42, and disposed within the body part 40; and spiral blades 44 that protrude spirally around the circumferential surface of the body part 40. The spiral blades 44 are formed at equal intervals in the circumferential direction, and comprise a plurality of engagement concavities 442 configured to engage with holding protrusions 32 of a holding part 31 of a rotating drive unit 3, and discharge concavities 443 formed between adjacent engagement concavities 442 and sized to allow soil and debris to pass through during operation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an extension for a drilling rig, a drilling rig, and a drilling unit, and more particularly to an extension for a drilling rig that can improve the efficiency of work by facilitating the discharge of soil or slime-like soil (also called mud, hereinafter collectively referred to as "soil, etc.") generated in a drilled hole during drilling work, compared with a conventional extension used in a drilling rig. [Background technology]

[0002] Conventionally, there have been proposed excavation devices and methods that combine an excavation device with a rotary drive device such as a rotary table that holds it rotatably, as excavation devices and methods that make it possible to operate long excavators at sites where large cranes cannot be used due to the presence of obstacles in the air, etc. For example, the present inventor has proposed the invention shown in Patent Document 1.

[0003] The drilling device, which is an invention described in Patent Document 1, includes a table base having a drive bush for rotating the drilling machine and a driving means for driving the drive bush, a lifting device provided on the table base to hold the drilling machine and raise and / or lower it, and a fall prevention means for stopping the drilling machine to prevent it from falling when the lifting device raises the drilling machine and removes the extension body on the upper part of the drilling machine, the lifting device has a liftable platform and a lifting drive means for raising and lowering the liftable platform, the liftable platform has a rotating body having a hole through which the drilling machine passes, the rotating body is fixed by a fixing means for fixing and releasing the drilling machine passed through the hole, a rotary table for a rotary drilling machine that rotates with the rotation of the drilling machine, and a drilling machine (Note that "drilling" as used in this specification has the same meaning as the above-mentioned term "drilling"). According to the drilling device described in Patent Document 1, it is possible to use a long drilling device to perform work even at a site where the use of a large crane is inappropriate, which is convenient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4649518 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when the inventor was operating the drilling equipment described in Patent Document 1, he noticed that it sometimes took time to drain the soil that was generated in the drilled hole during excavation work, especially the soil that had absorbed moisture and turned into a slime or liquid state. He thought that if the time required for this drainage could be shortened, it might be possible to move on to the subsequent process more quickly.

[0006] The present invention has been devised in consideration of the above points, and aims to provide an extension for an excavation equipment that promotes the discharge of soil and other materials generated in the excavation hole during excavation operations and improves work efficiency compared to conventional extensions used in excavation equipment, as well as an excavation equipment and excavation unit equipped with the same. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the extension for an excavation device of the present invention is used by connecting it to an excavation section arranged at the front of the excavation device, and comprises a long cylindrical main body, a joint section provided on one end of the main body and connectable to other members, a joined section provided on the other end of the main body and connectable to other members, an air flow path section which is a cylinder provided within the main body and has one end connected to the joint section and the other end connected to the joined section, a spiral blade which protrudes in a spiral shape on the circumferential surface of the main body and is formed at equal intervals in the circumferential direction, and a discharge recess formed between adjacent engaging recesses, the engaging recesses being configured to be able to engage with locking protrusions formed on a holding section which rotatably holds the extension for an excavation device in a rotary drive device, and the discharge recesses being sized to allow soil or slime-like soil that rises during operation to pass through.

[0008] The above-mentioned extension body for the drilling device is used by connecting it to the drilling section disposed at the front of the drilling device, and by sequentially connecting and extending it above the drilling section located at the back of the hole, which becomes deeper as the work progresses, it is possible to supply air, which serves as the working fluid for the drilling section, and to transmit the driving force to rotate the drilling section.

[0009] The cylindrical shape of the main body makes it less susceptible to earth pressure when entering a hole, and the long length of the main body makes it possible to connect the excavation part located at a predetermined depth to other members such as a swivel joint, thereby extending the excavation depth (length). The main body also serves as a mounting base for the joint part, the joined part, and the spiral blade, and as a protective member for the air flow path.

[0010] The joint part can be connected to a swivel joint, which is an air supply member from the outside (or a joined part relating to another drilling device extension when multiple drilling device extensions are joined; equivalent to "other parts"). The joined part can also be connected to a drilling part (or a joint part relating to another drilling device extension when multiple drilling device extensions are joined; equivalent to "other parts"). The air flow path part serves as a flow path for discharging the compressed air that flows in from the joint part from the joined part.

[0011] The aforementioned helical blade can form an earth discharge path between itself and the inner wall of the excavation hole. The earth discharge path is a semi-closed space surrounded by the inner wall of the excavation hole, the circumferential surface of the main body, and the pair of upper and lower helical blades, and is continuous in the direction in which the helical blades are formed. Soil and sand are lifted up (transported) through the earth discharge path by the lifting action of the helical blade, and are discharged from the opening of the excavation hole provided in the ground or the like.

[0012] The aforementioned discharge recess allows the soil and sand rising from below the excavation hole to pass through. As a result, a portion of the soil and sand (that has passed through the discharge recess) rises by taking a shortcut through the soil discharge path formed between the inner wall of the excavation hole and the spiral blade, facilitating the discharge of soil and sand generated in the excavation hole, and improving work efficiency by shortening the work time. The aforementioned engagement recess fits into the locking protrusion provided on the holding part of the rotary drive device, and the driving force applied from the rotary drive device during excavation work can be transmitted without loss.

[0013] The terms used in the description of the present invention have the following meanings. The term "soil" refers to soil generated in a hole during excavation work, including the soil containing pebbles and gravel. The term "slime-like soil" refers to mud mixed with water injected into the hole during excavation work or lubricating oil seeping out from the excavator.

[0014] An example of the "discharge recess" is one in which a notch is formed that opens outward from the spiral blade and faces the main body, and the notch may, for example, be one in which the part facing the main body is formed in a semicircular or angular shape.

[0015] The "drilling section" may be a structure capable of striking an object with a pneumatically operated hammer bit. Although the detailed structure is not limited, examples of the inventions disclosed in Patent No. 3721381, Patent No. 4076565, Patent No. 5049913, Patent No. 6322520, Patent No. 6716085, Patent No. 6864199, Patent No. 7111356, or Patent No. 7177471, JP 2022-45415, etc., which are invented by the present inventor. In addition, each of the inventions invented by the present inventor above is mainly a multi-hammer bit type structure, but is not limited thereto, and the "drilling section" in the present invention may be a single hammer bit type structure.

[0016] The above-mentioned excavation device extension may have a helical blade with 3 to 6 threads per meter in the longitudinal direction of the main body. According to the excavation device extension of this embodiment, the width of the soil discharge path formed between the inner wall of the excavation hole and the helical blade does not hinder the smooth flow of soil and sand passing through the soil discharge path.

[0017] By the way, when the inventor prototyped and tested an extension for an excavation device, it was found that, regarding the number of threads of the helical blades per meter in the longitudinal direction of the main body, if the number is less than 3, the width of the soil discharge path formed as described above is too wide, which reduces the friction coefficient of soil between the helical blades and reduces the upward force, which is undesirable, and on the other hand, if the number exceeds 6, the width of the soil discharge path formed as described above is too narrow, which can cause soil to become clogged, which reduces the transport force, which is undesirable. From these test results, the inventor arrived at the extension for an excavation device of this embodiment, and by limiting the number of threads of the helical blades to the above-mentioned range, the width of the soil discharge path formed is appropriate so as not to hinder the smooth flow of soil passing through.

[0018] The above-mentioned extension body for a drilling device may be configured such that the discharge recess opens outwardly of the helical blade and the cutout portion is formed in a semicircular arc shape toward the main body portion.

[0019] After the inventors made a prototype and conducted extensive research, they found that with the extension body for an excavation device of this embodiment, the cutout portion of the aforementioned discharge recess is easy to machine, and the shape of the discharge recess is unlikely to provide resistance when rising soil or sand passes through it, making it possible to achieve a smooth flow that does not hinder the rising of soil or sand.

[0020] In order to achieve the above object, the drilling device of the present invention comprises a drilling section having a structure capable of striking an object with a pneumatically operated hammer bit, and the above-mentioned drilling device extension body which is used by connecting to the drilling section.

[0021] In the above-mentioned drilling device, the drilling section can strike an object (such as the ground) with a pneumatically operated hammer bit. The power source, air, is introduced from outside the machine through the drilling device extension. The effects of the drilling device extension are as described above, so a description thereof will be omitted.

[0022] According to this excavation device, the above-mentioned effects of the excavation section and the extension body for the excavation device promote the discharge of soil and other materials generated in the excavation hole during excavation operations, thereby improving work efficiency, compared to conventional extension bodies used in excavation devices.

[0023] In order to achieve the above-mentioned objective, the drilling unit of the present invention comprises a drilling device having a drilling section configured to be able to strike an object with a pneumatically operated hammer bit, and the above-mentioned drilling device extension that is connected to the drilling section for use, and a rotary drive device having a holding section that rotatably holds the drilling device, the rotary drive device being configured so that a locking protrusion formed on the holding section fits into an engaging recess provided on the spiral blade of the drilling device extension.

[0024] In the above-mentioned drilling device, the drilling section can strike an object (such as the ground) with a pneumatically operated hammer bit. The power source, air, is introduced from outside the machine through the drilling device extension. The effects of the drilling device extension are as described above, so a description thereof will be omitted.

[0025] The rotary drive device rotatably holds the drilling device and can perform work while rotating the drilling device in the axial direction. This makes it possible to use the striking surface of the hammer bit evenly, so that the striking surface is less unevenly worn and the bottom surface of the hole formed is also less uneven.

[0026] Furthermore, the rotary drive unit has a locking protrusion formed on the holding portion that comes into contact with the excavation device when the excavation device is held, and can be fitted into an engagement recess provided on the spiral blade of the excavation device extension body, thereby preventing idling when rotating the excavation device and enabling efficient power transmission.

[0027] According to this drilling unit, the above-mentioned effects achieved by the drilling equipment and rotary drive unit promote the discharge of soil and other materials generated in the drilled hole during drilling operations, thereby improving work efficiency, compared to conventional extension bodies used in drilling equipment. Effect of the Invention

[0028] The extension body for a drilling rig, drilling rig, and drilling unit of the present invention can promote the discharge of soil and other materials generated in the drilling hole during drilling operations, thereby improving work efficiency, compared to conventional extension bodies used in drilling rigs. [Brief description of the drawings]

[0029] [Figure 1] FIG. 2 is an explanatory diagram showing the configuration of a drilling unit according to the present invention. [Diagram 2] FIG. 2 is a perspective view of an extension body for an excavation device shown in FIG. 1, in which (a) is a perspective view seen from a joint portion side, and (b) is a perspective view seen from a joined portion side. [Diagram 3] FIG. 2 is a longitudinal sectional view of the extension body for the drilling device shown in FIG. 1. [Figure 4] 2 is a side view of the extension body for the excavation equipment shown in FIG. 1, in which (a) is a side view seen from the joint portion side, and (b) is a side view seen from the joined portion side. FIG. [Diagram 5] FIG. 13 is an explanatory diagram showing a state in which the extension body for the drilling device and the holding portion of the rotary drive device are fitted together; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The embodiments of the present invention will be described in more detail with reference to Figures 1 to 5. Furthermore, the reference numerals in each drawing are given within the scope of reducing complexity and facilitating understanding, and when multiple equivalent parts are given the same reference numerals, the reference numerals may be given to only some of them.

[0031] [Drilling Unit 1] The drilling unit 1 shown in Figure 1 comprises a drilling device 2, a rotary drive 3 and a drilling device extension 4. Each part will be described below.

[0032] [Drilling rig 2] The drilling device 2 has a drilling section 20 that is structured to be able to strike an object with a pneumatically operated hammer bit, and an extension body 4 for the drilling device that is used by connecting to the drilling section 20. The structure of the extension body 4 for the drilling device will be described later.

[0033] In this embodiment, the drilling section 20 has an air tank section 21 and a hammer unit section 22. The hammer unit section 22 used in this embodiment is a multi-hammer bit type, but as described above, it may be a single hammer bit type. In addition, since the drilling section 20 is equivalent to the invention disclosed in JP 2022-45415 A, detailed description will be omitted and only an outline will be described.

[0034] The air tank section 21 is structured so that compressed air introduced from outside the machine can pass through or be temporarily stored therein, and can supply the compressed air to the hammer unit section 22 .

[0035] The hammer unit 22 is connected to the air tank 21 and can introduce compressed air, and has a structure in which multiple cylinders are stored in a cylindrical casing, with each cylinder storing a piston. Each piston moves forward and backward with the compressed air distributed by a distribution means, striking the mounting shaft end of the drilling bit attached to each end of the cylinder, and excavating the target object with the working surface of the drilling bit. Note that detailed structure of the hammer unit 22 is omitted from the illustration.

[0036] The hammer unit section 22 is structured so that the distribution timing of the compressed air sent to each cylinder by the distribution means is changed, and the timing of impact of each drilling bit is different. The hammer unit section 22 is structured so that increasing the pressure of the compressed air increases the reciprocating speed of each piston (i.e., the impact speed increases), while decreasing the pressure of the compressed air decreases the reciprocating speed of the piston (i.e., the impact speed decreases), making it possible to easily adjust the impact speed.

[0037] Furthermore, the drilling section 20 is capable of generating a treated fluid in the air tank section 21 by mixing compressed air and misted water, and the treated fluid supplied to the hammer unit section 22 drives each piston while cooling it, and is discharged from a discharge hole provided at the tip of each drilling bit.

[0038] [Rotational drive device 3] The rotary drive device 3 is also called a rotary table, and has a retaining portion 31 (also called a rotary bush) of the excavation device provided on the rotary drive portion, on which a locking protrusion 32 serving as an engaging element is formed (see FIG. 5), and each locking protrusion 32 fits (engages) with an engaging recess 442 serving as an engaged element on the excavation device side, thereby applying a rotational force to the excavation device. Note that the rotary drive device 3 has a publicly known structure equivalent to the rotary drive device disclosed in, for example, JP 2011-26955 A, and therefore the explanation of the structure and operation will be limited to the above outline, and detailed explanation and illustration of other components of the rotary drive device 3 will be omitted.

[0039] [Extension body for drilling equipment 4] It is used by connecting it to the drilling section 20 and comprises a main body section 40, a joint section 41, a joined section 42, an air flow path section 43, and a spiral blade 44.

[0040] The main body 40 is provided in a long cylindrical shape. Note that, although the main body 40 in this embodiment is provided with a length of 9 m and a diameter of 50 cm, the length and diameter of the main body 40 may be set appropriately.

[0041] The joint part 41 is provided on one end side of the main body part 40 so as to be connectable to another member. In this embodiment, the joint part 41 is a hexagonal column fixed to an end face on one end side of the main body part 40, and has an air passage 411 along its axial direction to allow ventilation. One end of the air passage 411 communicates with the air flow path part 43, and the other end becomes an opening 412 formed at the tip of the main body part 40 (see Fig. 2, the upper side of Fig. 3, and Fig. 4(a)).

[0042] The jointed part 42 is provided on the other end side of the main body part 40 so that other members can be connected thereto. In this embodiment, the jointed part 42 has a socket 421 opened on an end surface on one end side of the main body part 40, and the space behind the socket 421 is a hexagonal socket hole that is shaped to fit the joint part 41 and the joint part 211 provided on the tip of the air tank part 21 just right. The hole of the jointed part 42 is also open at the back and communicates with the air flow path part 43 (see Fig. 2(b), the lower side of Fig. 3, and Fig. 4(b)).

[0043] The air flow path portion 43 is a long tube (cylinder) provided inside the main body portion 40, one end of which is connected to and communicates with the air passage 411 of the joint portion 41, and the other end of which is connected to and communicates with the deepest part of the hole of the joined portion 42 (see Figure 3).

[0044] The helical blade 44 has an engagement recess 442 and a discharge recess 443 formed in a blade main body 441 that is provided in a spiral shape with a predetermined protruding height and thickness on the outer circumferential surface of the main body 40. The helical blade 44 is provided so that the number of threads per meter in the longitudinal direction of the main body 40 is 4.

[0045] In this embodiment, the "predetermined protruding height" of the spiral blade 44 is 5.5 cm from the outer peripheral surface of the main body 40, and the thickness of the spiral blade 44 is 3.2 cm, but this is not limited to this and may be changed according to the thickness of the extension body 4 for the drilling device, which is set according to the drilling hole.

[0046] A plurality of engaging recesses 442 are formed at equal intervals in the circumferential direction, and in this embodiment, the number of engaging recesses 442 is three per row, and the engaging recesses 442 formed in each row are arranged to coincide in the axial direction. Also, the engaging recesses 442 have a shape that can be fitted with the locking protrusions 32 formed in the holding part 31 of the rotation drive device 3, and in this embodiment, the engaging recesses 442 are formed by opening at the outer edge of the spiral blade 44 and cutting out a square shape with a depth reaching the outer circumferential surface of the main body part 40.

[0047] The discharge recess 443 is located between adjacent engagement recesses 442, opens outward from the spiral blade 44, and is formed in a semicircular arc shape with a depth such that the tip of the cutout portion reaches the outer circumferential surface of the main body 40. The opening width of the discharge recess 443 in the spiral blade 44 is set to about 2.5 times the opening width of the engagement recess 442. In this embodiment, the number of discharge recesses 443 per row is three, and the discharge recesses 443 formed in each row are arranged to coincide in the axial direction.

[0048] According to the extension body 4 for the drilling device, the drilling device 2 to which it is applied can be rotatably attached to the rotary drive device 3, and a drilling method (hereinafter referred to as the "rotary drilling method") can be carried out in which the drilling device 2 is rotated by the rotary drive device 3.

[0049] (effect) The effects of the drilling unit 1, and the drilling equipment 2 and drilling equipment extension body 4 used therein will be described.

[0050] The drilling unit 1 is used by connecting a swivel joint 5 to a joint part (either joint part 211 or joint part 41) located at the top of the drilling device 2, and suspending the drilling device 2 from a crane vehicle or a crane (not shown) via the swivel joint 5. When starting drilling work, if the drilling hole has not been formed and therefore the connection of the drilling device extension body 4 is not necessarily required, the drilling device extension body 4 may be directly connected to the joint part 211 provided on the upper part of the air tank part 21 of the drilling device 2, instead of the joint part 41 of the drilling device extension body 4, and then, after the drilling hole becomes deeper, the drilling device extension body 4 may be added to the drilling device 2 and the joint part 41 and the swivel joint 5 may be connected.

[0051] The swivel joint 5 has its suspension height adjusted by a wire (not shown) that is let out from the boom of the crane. A compressed air supply pipe (not shown) is connected to the swivel joint 5, and compressed air is supplied to the excavation device 2 from an external compressor (compressed air supply source; not shown) via this supply pipe.

[0052] (1) The drilling unit 1 is installed at the site where the drilling work is to be performed, and the swivel joint 5 is connected. At this time, the drilling device 2 is installed through the holding part 31 of the rotary drive device 3, and the engaging recess (which has the same structure as the spiral blade 44 and the engaging recess 442 of the drilling device extension body 4; not shown) formed on the spiral blade provided on the peripheral surface of the air tank part 21 is fitted (engaged) with the locking protrusion 32 of the holding part 31. As a result, the rotary drive device 3 can rotate the drilling device 2 and perform the drilling work until the depth of the drilled hole reaches about the middle of the drilling device 2 (the top of the drilling device 2 reaches the top surface of the rotary drive device 3).

[0053] (2) When the drilling work progresses and the depth of the excavated hole reaches about the middle of the drilling rig 2, the work is stopped and the drilling rig extension body 4 is connected to the drilling rig 2.

[0054] Specifically, the swivel joint 5 is removed from the excavation equipment 2, the joint part 211 of the excavation equipment 2 is inserted and fixed into the joined part 42 of the excavation equipment extension body 4, and the joint part 41 of the excavation equipment extension body 4 is connected to the swivel joint 5. Next, the engagement recess 442 of the excavation equipment extension body 4 is fitted (engaged) with the locking protrusion 32 of the holding part 31. Since the engagement recess 442 fits with the locking protrusion 32 of the rotation drive unit 3, the driving force applied from the rotation drive unit 3 during excavation work can be transmitted without loss.

[0055] Thereafter, by rotating the rotary drive device 3, the drilling device extension 4 rotates, and the drilling device 2 connected to the drilling device extension 4 also rotates in unison, restarting the drilling operation. As a result, the rotary drive device 3 can rotate the drilling device 2 to perform the drilling operation until the depth of the drilled hole reaches the top of the drilling device extension 4 (the top of the drilling device extension 4 reaches the top surface of the rotary drive device 3).

[0056] (3) When the drilling work progresses and the depth of the drilled hole reaches the top of the drilling equipment extension body 4, the work is stopped and the next (hereinafter referred to as the "second") drilling equipment extension body 4 is connected to the drilling equipment extension body 4 connected in (2) above.

[0057] Specifically, the swivel joint 5 is removed from the extension body 4 for the drilling equipment, the joint part 41 of the extension body 4 for the drilling equipment is inserted and fixed into the joined part 42 of the second extension body 4 for the drilling equipment, and the joint part 41 of the second extension body 4 for the drilling equipment is connected to the swivel joint 5.

[0058] In addition, since the engagement recesses 442 of the extension body 4 for the drilling device are arranged to coincide in the axial direction, when the extension body 4 for the drilling device that was connected first is connected to the second extension body 4 for the drilling device, the opening positions of the engagement recesses 442 arranged on each of them coincide in the axial direction. As a result, the engagement recesses 442 of the second extension body 4 for the drilling device and the locking protrusions 32 of the rotation drive device 3 naturally fit together without any fitting work, which saves the effort of performing the same work and contributes to improving work efficiency.

[0059] Also in the second excavator extension body 4, the engagement recess 442 and the locking protrusion 32 of the rotation drive unit 3 fit together, so that the driving force applied from the rotation drive unit 3 during excavation work can be transmitted without loss.

[0060] Thereafter, by rotating the rotary drive 3, the second drilling device extension 4 rotates, and the first drilling device extension 4 and the drilling device 2 connected thereto also rotate in unison, thereby restarting the drilling operation. As a result, the rotary drive 3 can rotate the drilling device 2 to perform the drilling operation until the depth of the drilled hole reaches the top of the second drilling device extension 4 (the top of the second drilling device extension 4 reaches the top surface of the rotary drive 3).

[0061] (4) As the drilling work continues, the drilling work can be continued until the desired depth is reached by adding the third, fourth, etc. drilling device extensions 4. Note that the connection of the third and subsequent drilling device extensions 4 is the same as that described in (3) above, so the explanation will be omitted here.

[0062] (5) Then, each part of the extension body 4 for the excavation device that has penetrated into the ground has the following functions and effects.

[0063] The drilling device extension body 4 is used by connecting it to the drilling section 20 disposed at the tip of the drilling device 2, and by sequentially connecting and extending it above the drilling section 20 located at the back of the hole as the depth increases as the work progresses, it is possible to supply air, which is the working fluid of the drilling section 20, and to transmit the driving force to rotate the drilling section 20.

[0064] Because the main body 40 is cylindrical, it is less susceptible to the effect of earth pressure when entering a hole, and because it is long, it can connect between the excavation part 20 located at a predetermined depth and the swivel joint 5, or between the swivel joint 5 and another excavation device extension body 4 that is already connected, thereby extending the excavation depth (length). In addition, the main body 40 serves as an installation base for the joint part 41, the joined part 42, and the spiral blade 44, and also serves as a protective member for the air flow path part 43.

[0065] The joint part 41 can be connected to the swivel joint 5 or another connected drilling device extension 4. The joined part 42 can be connected to the drilling part 20 or another connected drilling device extension 4. The air flow path part 43 serves as a flow path for discharging the compressed air flowing in from the joint part 41 from the joined part 42.

[0066] The spiral blade 44 can form an earth discharge path between itself and the inner wall of the excavation hole. The earth discharge path is a semi-closed space surrounded by the inner wall of the excavation hole, the circumferential surface of the main body 40, and the pair of upper and lower spiral blades 44, and is continuous in the direction in which the spiral blades 44 are formed. Soil and sand, etc., are lifted up (transported) through the earth discharge path by the swirling action of the spiral blade 44, and are discharged from the opening of the excavation hole provided in the ground, etc.

[0067] As mentioned above, if the number of helical blades provided per meter in the longitudinal direction of the main body is less than three and more than six, it may hinder the smooth flow of soil and sand passing through. However, in this embodiment, the helical blade 44 has four blades per meter in the longitudinal direction of the main body 40, so that the width of the soil discharge path formed between the main body 40 and the inner wall of the excavation hole does not hinder the smooth flow of soil and sand passing through the soil discharge path.

[0068] The discharge recess 443 allows soil and sand rising from below the excavation hole to pass through the blade body 441. As a result, a portion of the soil and sand (that has passed through the discharge recess) rises by taking a shortcut through the soil discharge path formed between the inner wall of the excavation hole and the spiral blade 44 (the blade body 441), facilitating the discharge of soil and sand generated in the excavation hole, and improving work efficiency by shortening work time. In addition, because the discharge recess 443 has the above-mentioned shape, the cutout portion can be easily machined, and the shape is unlikely to provide resistance to the rising soil and sand when it passes through the discharge recess 443, realizing a smooth flow that does not impede the rising of the soil and sand.

[0069] In this way, the drilling unit 1, and the drilling equipment 2 and extension body 4 for the drilling equipment used therein can promote the discharge of soil and other materials generated in the drilling hole during drilling operations, thereby improving work efficiency, compared to conventional extension bodies used in drilling equipment.

[0070] The terms and expressions used in the present specification and claims are merely explanatory and not limiting, and are not intended to exclude terms and expressions equivalent to the features described in the present specification and claims and parts thereof. It goes without saying that various modifications are possible within the scope of the technical idea of ​​the present invention. Furthermore, the terms first, second, etc. do not mean rank or importance, but are used to distinguish one element from another element. [Explanation of symbols]

[0071] 1. Drilling Unit 2. Drilling rig 20 Excavation Section 21 Air tank section 211 Joint 22 Hammer unit 3 Rotational drive unit 31 Holding part 32 Locking protrusion 4. Extension for drilling equipment 40 Main body 41 Joint 411 Ventilation Channel 412 Opening 42 Joint part 421 Underbite 43 Air flow passage 44 Spiral Feather 441 Blade body 442 Engagement recess 443 Discharge recess 5 Swivel joint

Claims

1. It is used by connecting it to a drilling section disposed at the front of the drilling device, A long cylindrical main body portion, a joint portion provided on one end side of the main body portion and connectable to another member; a joint portion provided on the other end side of the main body portion and capable of connecting another member; an air flow passage portion which is a cylinder provided in the main body portion and has one end connected to the joint portion and the other end connected to the joined portion; a spiral blade provided on the peripheral surface of the main body with a plurality of engagement recesses formed at equal intervals in the circumferential direction and a discharge recess formed between adjacent engagement recesses, the engagement recesses being provided so as to be engageable with locking protrusions formed on a holding portion that rotatably holds the excavation device extension in a rotary drive device, and the discharge recesses being sized to allow soil or slime-like soil that rises during operation to pass through; Equipped Extension for drilling equipment.

2. The number of grooves per meter in the longitudinal direction of the main body is set to 3 to 6.

2. The extension for a drilling rig according to claim 1.

3. The discharge recess is open to the outside of the spiral blade, and a cutout portion is formed in a semicircular arc shape toward the main body.

3. An extension for a drilling rig as claimed in claim 1 or 2.

4. A drilling section having a structure capable of striking an object with a pneumatically operated hammer bit; The extension body for a drilling device according to claim 1 or 2, which is used by connecting it to the drilling section; Equipped Drilling equipment.

5. a drilling device having a drilling section having a structure capable of striking an object with a pneumatically operated hammer bit, and the drilling device extension body according to claim 1 or 2, which is used by being connected to the drilling section; a rotary drive device having a holding portion for rotatably holding the drilling device, the rotary drive device having a structure in which a locking protrusion formed on the holding portion is fitted into an engagement recess provided on the spiral blade of the drilling device extension body; Equipped Drilling unit.

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