JP5322114B2 - Cutter head - Google Patents

Description

    The present invention relates to excavation technology using machinery for foundation work and the like, particularly in the field of manufacturing and providing a tip excavation head capable of constructing an excavation hole while supplying excavation liquid into the ground. From the field of providing, selling and providing equipment and instruments necessary for its transportation, storage, assembly and installation, materials necessary for such materials, machinery and parts, such as wood, stone, various fibers, Fields that provide plastics, various metal materials, etc., electronic components incorporated in them, control-related equipment that integrates them, fields of various measuring instruments, fields of power equipment that moves the equipment and instruments, and electric power used as energy Fields generally referred to as industrial machinery, such as the fields of electricity and oil, which are energy sources, as well as testing and researching those facilities and equipment, and displaying and selling them. , Fields related to imports and exports, results of their use, facilities for producing them, fields related to the collection and transportation of garbage debris generated by the operation of instruments, and efficient disposal of these garbage debris There is no technical field that is not related to the recycle field to be reused, to a new field that cannot be envisaged at this time.

(Points of interest)
Foundation works such as various buildings such as buildings and houses, bridges, steel towers, utility poles, traffic lights, traffic signs, and other various structures are ready-made according to individual installation locations, ground properties, durability, and other conditions. Appropriate methods must be selected and constructed from various methods such as pile method, cast-in-place pile method, continuous wall method, ground improvement method, etc. Earth auger, earth drill, cutter head, etc. should be used appropriately according to various geology and stratum such as bedrock, gravel, sand, clay soil (silt), clay, humus soil, etc. When drilling geological formations such as bedrock, gravel, sand, etc., it is common to drill while expelling drilling fluid from the tip of the auger head in order to suppress overheating, vibration, noise, etc. of the drilling bid. things and However, if there are layers of bedrock, gravel, sand, etc. under the stratum such as clay, silt, clay, humus, etc., use an auger head or cutter head suitable for the geology. It must be used from the beginning or excavated by exchanging the head each time. For example, it is stipulated to secure a predetermined penetration length regardless of geology, such as installation work of utility poles. In such cases, the hard ground must be deeply excavated, and despite the relatively small diameter holes, it takes time for construction and the construction cannot be carried out quickly. Therefore, improvement of excavation technology is awaited.

(Conventional technology)
(Conventional technology)
Reflecting this situation, proposals that can be used to overcome this situation are not unheard of.
For example, as typified by those proposed in the following Patent Documents 1 (1) to (4), a plurality of tips are provided on the tip of the rotating shaft that penetrates the inside of the propelling pipe and on a tapered cone or a conical peripheral wall surface. Equipped with a cutter head that supports each base shaft of multiple roller cutters in such a way that the tip end of each roller cutter crosses over the extension line of the center of the rotation axis, and makes it effective for hard ground such as rock And a conical outer peripheral wall set to an outer diameter that matches the inner diameter of the excavation hole, as shown in Patent Document 1 (5) and (6), etc. An auger head with an outer shape formed by wrapping protrusions is provided so that the soft ground can be cut efficiently. As in Patent Document 1 (7), the periphery of each auger shaft arranged in parallel One of the rotation miracles between neighboring objects There is mounted a casing mutually overlapping, such that enhanced drilling accuracy is scattered to increase the durability of the auger shaft in drilling.

    However, as shown in the former patent documents 1 (1) to (4), in which the rotating shaft is arranged in a longitudinal manner in the propulsion pipe, the propulsion pipe is used as a partition wall for mold filling for ready-mixed concrete after excavation. Leave the ground as a shield and fill the bulkhead shield with ready-mixed concrete at any stage, either while lifting the rotating shaft and the cutter head at the tip of the shaft to the ground, or after lifting it to the ground. Although it is effective for the construction method of forming a pile, for example, there is a disadvantage that it is not suitable for a so-called ready-made pile construction method in which a pre-made pillar-shaped object such as a pre-made pile or a utility pole is embedded. The outer auger head formed by wrapping a spiral belt-like projection around the conical outer wall of (6) is effective for soft ground, but is not suitable for geology such as rock, gravel, sand, Efficient drilling The multi-axis earth auger typified by the latter patent document 1 (7) realizes efficient excavation by increasing the strength of each auger shaft. Although it can, it is not suitable for cylindrical boring, and it has a fatal disadvantage that it cannot be used especially for installation of utility poles.

In addition, as disclosed in Patent Document 1 (8), the applicant of the present application has integrated a tubular rotary shaft in a skewered shape at a substantially central portion of an airtight container for storing cooling water, and a pipe line in the rotary shaft is the same. The container is provided with a cooling water supply port and a compressed air supply port, and a hollow excavation pipe having an auger head attached to the tip is connected to the lower end of the tubular rotation shaft. We have already developed an embedment construction device that connects the drive shaft to the upper end and ejects cooling water from the rotating auger head to excavate the burial hole for long workpieces. There is a need for the development of a drilling head that can be drilled efficiently even in difficult to drill ground.
(1) Japanese Patent Laid-Open No. 2002-115489 (2) Japanese Patent Laid-Open No. 2002-227593 (3) Japanese Patent Laid-Open No. 2008-88702 (4) Japanese Patent Laid-Open No. 2009-293256 (5) Japanese Patent Laid-Open No. 5-106223 (6) Japanese Unexamined Patent Application Publication No. 2005-61192 (7) Japanese Unexamined Patent Application Publication No. 2007-191885 (8) Japanese Unexamined Patent Application Publication No. 2009-162019

(Awareness of problems)
As mentioned above, various cutter heads, auger heads and multi-axis earth augers that have been proposed so far are all ready-made piles, utility poles, traffic lights, traffic signs, etc. For example, when the ground is difficult to excavate in a situation where a utility pole or traffic light that has collapsed due to a natural disaster or a traffic accident has to be restored quickly, the early restoration is not possible. It often becomes quite difficult, and the construction and civil engineering industry, power industry, communication industry, traffic signal and signage industry, etc. have long spent considerable time on restoration of various nearby lifelines and road traffic. In view of the fact that it was supposed to be, as one of those deeply involved in those industries, such a situation could not be left as it is.

(Object of invention)
Therefore, the present invention is based on the judgment that it is not possible to develop a new excavation technology that enables various pillars such as ready-made piles, utility poles, traffic signals, traffic signs, etc. to be placed efficiently and quickly on difficult excavated ground. As a result of the rapid development and research and repeated trials and errors over many years and numerous trials and experiments, this time, we finally succeeded in realizing a cutter head with a new structure. In the following, the configuration will be described in detail together with an embodiment representative of the present invention shown in the drawings.

(Structure of the invention)
As will be clearly understood from the embodiments representing the present invention shown in the drawings, the cutter head of the present invention basically comprises the following configuration.
That is, it is concentrically rotated with respect to the distal end of a hollow excavation shaft connected to a drilling fluid supply source, suspended and connected to a proximal end of a center shaft formed through a supply pipe line so as to be driven and rotated by a rotational drive source. A connecting mechanism that can be incorporated detachably is provided, and a tip injection port leading to the supply pipe line is formed at the tip of the center shaft, and a balanced circumferential angle is provided around the tip of the center shaft. For each, a total of a plurality of cone-shaped small cutters with a vertically inverted trapezoidal vertical cross section with a plurality of chips planted on the peripheral wall, each cone-shaped small cutter tip extension line is the center shaft tip, Arranged so as not to contact the peripheral wall of the center shaft at a predetermined angle posture intersecting with the shaft axis or its extension line, and between each cone-shaped small cutter around the base end of the center shaft To balance For each turning angle, a total of a plurality of cone-shaped large cutters with a trapezoidal shape with a vertically inverted trapezoidal cross section and a plurality of chips planted on the peripheral wall, and the extension line of the end of each cone-shaped large cutter is the center shaft. The tip end is arranged in a predetermined angle posture crossing the wrinkle shaft center or an extension line thereof so as to be non-contact with the peripheral wall of the center shaft, and both ends of the cutter shafts of each cone-shaped small cutter and each cone-shaped large cutter are Between each holder projecting from the center shaft peripheral wall, the shaft is rotatably mounted, and a supply pipe line is provided at a plurality of locations facing each peripheral wall of each cone-shaped small cutter and each cone-shaped large cutter on the center shaft peripheral wall. A cutter head having a gist of a configuration in which a plurality of peripheral wall injection ports branched from the nozzle are formed .

If the expression of the cutter head composed of this basic structure is changed, the cutter head is suspended and connected to the base end of the center shaft with the feed pipe passing through it so that it can be driven and rotated by a rotational drive source. A concentric, non-rotatable and detachable connecting mechanism is provided for the tip of the hollow excavation shaft connected to the liquid supply source, and a tip injection port leading to the supply pipe is formed at the tip of the center shaft. In addition, a plurality of cone-shaped small cutters each having a vertically inverted trapezoidal vertical cross-section and having a plurality of chips planted on the peripheral wall are arranged around each end of the center shaft near the tip. The tip of the small cutter tip is arranged so that the extension line of the center axis of the small shaft crosses the center axis of the center shaft or the extension line so that it does not contact the peripheral wall of the center shaft. In the vicinity of the base end of the cone-shaped large cutter with a vertically inverted trapezoidal vertical cross section and a plurality of chips planted on the peripheral wall for each circumferential angle to be balanced, as arranged between each cone-shaped small cutter A total of a plurality of cone-shaped large cutter tips with the extension line of the wrinkle axis intersecting the center shaft tip with the wrinkle axis or its extension line at the same angle and posture as each cone-shaped small cutter. Arranged so as to be non-contact with the shaft peripheral wall, each end of the cutter shaft of each cone-shaped small cutter and each cone-shaped large cutter is rotatably mounted between the holders projecting from the center shaft peripheral wall, From the configuration in which a plurality of peripheral wall injection ports branched from the supply pipe are drilled in a plurality of locations facing the peripheral walls of each of the cone-shaped small cutter and each cone-shaped large cutter of the center shaft circumferential wall. Become a cutter head .

    As described above, according to the cutter head of the present invention, unlike the conventional one, each of the conical shapes that revolve around the center shaft with the rotation of the center shaft from the unique characteristic configuration as described above. The cutter rotates in the opposite direction to the center shaft due to contact friction with the inner peripheral wall of the drilling hole of each tip, and the drilling fluid supplied through the supply pipe passes through the peripheral wall injection port and the tip throughout the excavation. Since it will be discharged continuously from the injection port, the formation around the cutter head in the excavation hole is effectively mud, and the frictional resistance generated by the rotation and excavation of each conical cutter and each tip is greatly reduced and cooled. In addition to dramatically improving durability against erosion and wear, it excels in excavation and agitation performance. Until now, bedrock, gravel, sand, etc. Although I was very hard at work to install off-the-shelf piles and utility poles on difficult-to-excavate geology, these obstacles were solved all at once and the workability of lifeline laying and restoration work, etc. was greatly improved, and safety In addition, the excellent feature of being able to be constructed quickly is obtained.

    In addition, a plurality of small cone-shaped cutters are arranged around the tip of the center shaft, and a plurality of large cone-shaped cutters are arranged between the cone-shaped small cutters around the base end of the center shaft. The cutter head is arranged in such a way that each cone cutter is distributed around the center shaft, and a small-diameter cone-shaped cutter is arranged near the tip of the center shaft. It is possible to reduce the pressure to a lower level, and it is possible to realize the effect that it is possible to realize further efficient and efficient drilling to the difficult excavation formation.

    In addition, the cutter head with the mounting orientation of each cone-shaped small cutter and each cone-shaped large cutter at a constant angle greatly reduces the excavation resistance, and can also efficiently excavate into rock or concrete. In addition, the wear resistance and durability can be remarkably increased.

    A cutter head in which the tips of the large cone-shaped cutters are arranged adjacent to each other between the base ends of the cone-shaped small cutters is arranged such that each cone-shaped small cutter arranged near the tip of the center shaft and the center As the continuity of the outer shape with each cone-shaped large cutter located near the shaft base end is greatly enhanced, the excavation mud, sand, gravel, crushed stone, etc. of the cutter head tip can be made even more smoothly. The cutter head base end can be discharged to the hook.

    In addition, the center shaft is provided with a tip bit attachment / detachment mechanism at the tip injection port, and in addition to excavation by sending drilling fluid from the tip injection port, for example, a deep bit is attached. The excavation performance at the tip can be greatly improved, and the tip bit can be removed and replaced according to changes in geology and formation, and the tip bit that has been worn, deformed or damaged can be easily replaced. The characteristic is obtained.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
The center shaft forms the central axis portion of the cutter head, and the base end thereof can be connected to the distal end of the hollow excavation shaft, and a supply pipe for drilling fluid communicating from the base end to the distal end is secured inside the center shaft. And a plurality of peripheral wall injection holes that integrally support the holders that support the plurality of conical cutters and that can supply drilling fluid toward the peripheral walls of the conical cutters supported between the holders. It has a function to enable formation, and has sufficient durability to excavate hard rock by receiving the rotational driving force from the rotational drive source and hollow excavation shaft, and at the base end of the hollow excavation shaft On the other hand, a concentric, non-rotatable and detachable connecting mechanism is provided, and a supply pipe line extends from the base end to the tip, and a tip injection port leading to the supply pipe is formed at the tip. Around the center shaft The circumferential each angle that must be assumed that formed by projecting a plurality of holders to freely allow journalled rotate at an appropriate angle and orientation of each conical cutter.

    The coupling mechanism has the function of allowing the center shaft base end to be concentrically, non-rotatably and detachably incorporated at the distal end of the hollow excavation shaft so that it can be maintained in a safe and reliable integrated state during excavation. For example, as shown in the embodiments described later, the center shaft base end is formed in a hexagonal shape in the horizontal section, as shown in the head of the hexagonal bolt, and hollow excavation is performed. It is desirable that a hexagonal concentric hole is formed at the shaft tip so that it can be fitted and removed concentrically, and can be firmly connected using a connecting pin that penetrates in the diameter direction. The horizontal cross-sectional shape of the proximal end can be various polygonal shapes such as triangular, quadrangular, pentagonal, heptagonal, octagonal, + -shaped, star-shaped, etc. It is.

    The supply line can supply the drilling fluid supplied from the drilling fluid supply source to the base end of the center shaft through the hollow drilling shaft to the tip of the center shaft, and is sent from each peripheral wall injection port and tip injection port of the center shaft. The functions to be enabled are shared, and should be formed with an accuracy that does not cause a large amount of drilling fluid to leak from the connection mechanisms other than the peripheral wall injection ports and the tip injection ports. As shown in the embodiment, it is desirable that the center shaft be formed so as to pass through in a straight line concentric or parallel to the axis of the center shaft.

    The peripheral wall injection port branches from the supply pipe line in the center shaft and has a function of supplying and discharging the drilling fluid toward the peripheral wall of each cone-shaped cutter. It should be opened at least at one location between them, and if it is a midway location on the center shaft, it can be drilled at a location other than the location facing the peripheral wall of the conical cutter, In order to be able to supply a sufficient amount of drilling fluid to almost the entire cone-shaped cutter, as shown in the examples described later, it is necessary to confront each peripheral wall near the proximal end and the distal end of each cone-shaped cutter. It can be an opening.

    The tip injection port is capable of discharging the drilling fluid from the tip of the center shaft in a concentric direction and / or a predetermined angle direction, and can be used as a spray nozzle for discharging the drilling fluid. As shown in Fig. 2, for example, a detachable mechanism is provided that allows a tip bit such as a triple cone bit to be attached while maintaining the function as a drilling fluid discharge nozzle. The drilling fluid can be discharged from the center of the bit.

    The cone-shaped cutter functions to enable efficient drilling of difficult-to-excavate geology such as rock, gravel, and sand around the center shaft. It has a vertically inverted trapezoidal shape with multiple chips implanted on the peripheral wall. The center shaft peripheral wall is arranged at every balanced circumferential angle around the center shaft, and the extension line of the tip shaft axis intersects the center shaft tip or the extension line at a predetermined angle posture. It is arranged so that it is not in contact with itself, and is pivotally mounted around the axis of itself (conical cutter), and if drilling fluid is supplied, it is easy to excavate hard rock It should have sufficient durability to the extent that it does not wear or deform, and should be fitted with both ends of the conical cutter between the holders protruding in a branched manner from the peripheral wall of the center shaft, Tongue on the perimeter wall It is possible to further improve the wear resistance by painting Tencarbide particle hard materials, etc., and as shown in the examples to be described later, it is supported by a central support shaft and a bearing. In addition, it is possible to arrange a plurality of cone-shaped small cutters at the center shaft tip and a plurality of cone-shaped large cutters at the center shaft base end. In the case of the above, it is assumed that each large cone-shaped cutter is axially attached at the same angle as each small cone-shaped cutter, and the tip of each large cone-shaped cutter is adjacent to the base end of each small cone-shaped cutter. It shall be arranged in a proper arrangement.

    The chips are scattered on the peripheral wall of the cone-shaped cutter and share the function of excavating and stirring the ground, and are implanted so as to protrude in a dotted manner on the peripheral wall of the cone-shaped cutter. It is possible to make the outer wall of the cone-shaped cutter interspersed so as to be arranged in a spiral like a drill, etc., and integrated with the peripheral wall of the cone-shaped cutter In addition, it may be removable and replaceable, such as a bolt-like screw provided at the base and removably screwed into a screw hole drilled in the peripheral wall of the conical cutter. It can be said that the material is preferably made of cemented carbide such as tungsten carbide or its alloy, or a material having durability strength equal to or higher than that, but other alloy tool steel, high speed Tool steel, stainless steel and other hard and tough, Can also be of Xiu a steel material to abrasive, further, it is of course possible to made by coating a hard material such as titanium or titanium carbonitride nitride.

    The holder bears the function of allowing the tip and base ends of each cone-shaped cutter to be pivotally mounted around the center shaft. Set the dimensions and shape so that the outer diameter of the cutter does not protrude beyond the tip diameter of the cutter. It should be set to a size and shape that do not protrude, and each must support each cone-shaped cutter with sufficient strength, and each cone-shaped cutter can be incorporated in a non-detachable manner. As shown in the embodiment, both ends of the central support shaft of each cone-shaped cutter can be detachably mounted using a sinking plug or the like with various bearings or the like interposed between them. .

    Rotation drive source fulfills the function of allowing the base end of the cutter head center shaft connected to the tip of the hollow excavation shaft to be driven to rotate at a torque and speed capable of excavation. It can be hung on various mobile cranes such as cranes, truck mounted cranes, etc., and the output from various drive sources such as hydraulic pumps, electric motors, or engines can be transmitted to the base end of the hollow excavation shaft as rotational driving force For example, crawler drill, drill jumbo, boring machine, vertical pile excavator, tunnel boring machine, free section excavator, press-fitting small-diameter propulsion machine, pile driver, low noise and low vibration earth auger, Or it can be built into various construction machines such as earth drills, for example , Not to mention also it may be the like buried construction apparatus, as described in the patent document 1 (8).

    The drilling fluid supply source has a function of enabling the drilling fluid to be pumped to the supply line of the cutter head, and a sufficient amount of drilling fluid is supplied from each peripheral wall injection port and the tip injection port of the cutter head during excavation. It must be capable of releasing gas, and can be a drilling fluid tank and feed pump that can be mounted on various construction machines and transport vehicles such as trucks, supply lines such as pressure hoses and pipes, etc. This can also be a buried construction device described in the above-mentioned Patent Document 1 (8) and already proposed by the present inventor.

    When the drilling fluid is sent into the ground from the peripheral wall injection port and the tip injection port of the cutter head, they become cooling liquid to cool the cutter head and improve the fluidity of earth and sand and crushed stone in the drilling hole. , Which functions to prevent clogging or accumulation of each movable part of the cutter head and enable smooth and efficient drilling, such as water, bentonite, clay, polymer, water, hydrocarbons, etc. It is possible to use various solutions containing as a main component, a gas-liquid mixed fluid, or the like, and it can be replaced with a slurry for backfilling or cement milk according to the contents of construction.

The hollow excavation shaft allows the rotary drive source and the drilling fluid supply source to be detachably connected to the proximal end of the cutter head center shaft. It must be connected to the power source and be able to supply the drilling fluid to the cutter head through the internal conduit, and suspended in a vertical position on a crane mounted on various construction machines, transport vehicles such as trucks, etc. Either directly connected to the arm-shaped boom tip which can be changed to a horizontal posture or tilted posture, or the rotating shaft of the boom tip itself, or tunnel boring It can be either directly connected to a horizontal drive source rotary shaft as in a machine, or can be either a drive source rotary shaft itself.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

    1 is a cross-sectional view of the cutter head of FIG. 1, a plan view of the cutter head of FIG. 2, a cross-sectional view of the AA line portion in FIG. 1 of FIG. 3, a cross-sectional view of the BB line portion of FIG. 5 is a cross-sectional view taken along line CC in FIG. 1, a cross-sectional view of a cutter head incorporating the tip bit of FIG. 6, a cross-sectional view of the cutter head having the tip bit of FIG. 7, and a perspective view of the cutter head of FIG. 9 and the perspective view of the cutter head connected to the hollow excavation shaft of FIG. 9, the connection mechanism 21 is provided at the base end 20 of the center shaft 2 through which the supply pipe 23 passes vertically, and the tip injection port is provided at the tip 25. 26, and a plurality of conical cutters 3, 3,... With a plurality of chips 4, 4,... 3, 3,... Cutter shafts 32, 32,. .. Are rotatably mounted between the holders 5, 5,... Projecting from the peripheral wall of the shaft 2, and a plurality of peripheral wall injection ports 24, 24,. A typical embodiment of the cutter head according to the present invention is shown.

    As can be clearly seen from each of these drawings, the cutter head 1 of the present invention has a pipe-type center shaft 2 in which a supply pipe 23 extends vertically in the center, and as shown in FIGS. 1 and 3, The base end 20 of the center shaft 2 is formed in a thick tubular tube having a regular hexagonal cross section so as to form a connection mechanism 21, and a connection hole 22 for a connection pin (not shown) penetrating in the diameter direction is formed. As shown in FIG. 9, it is suspended and connected so as to be able to be driven and rotated by the rotation drive source 6, and is detachably attachable to a socket portion 80 formed at the tip 80 of the hollow excavation shaft 8 connected to the excavation fluid supply source 7. As shown in FIG. 1, a tip injection port 26 communicating with the supply pipe 23 is opened at the tip 25 of the center shaft 2.

    As shown in FIGS. 6 to 9, the distal end 25 of the center shaft 2 is formed by processing a female screw for attaching a distal end bit 27 such as a triple cone bit which is a deep punching bit into a concentric cylindrical inner peripheral wall. The attaching / detaching mechanism 28 can be provided, and as shown in FIGS. 1 and 2, the periphery of the center shaft 2 near the tip 25 is provided at every balanced circumferential angle (120 °). Conical small cutters 30, 30, which have a vertically inverted trapezoidal vertical cross section and are planted so that a plurality of chips 4, 4,... Are arranged evenly distributed on a peripheral wall 31 whose inclination angle β from the center is set to 9 °. 30 in total, a predetermined angle α (12 °) at which the extension line of each cone-shaped small cutter 30, 30, 30 has an axis extending from the center axis of the center shaft 2 intersects the extension line of the axis axis. In the posture, 2 rounds of the center shaft Arranged so as to be non-contact with the wall, and further around the proximal end 20 of the center shaft 2, a balanced circumferential angle (120 °) so as to be arranged between the small cone-shaped cutters 30, 30, 30. ), A total of three cone-shaped large cutters 35, 35, 35 each having a vertically inverted trapezoidal vertical section and having a plurality of chips 4, 4,... The extension line of the shaft center of the 35, 35 crosses the extension line of the center shaft 2 tip 25 of the center shaft 2 and has the same angle α (12 °) posture as each of the cone-shaped small cutters 30, 30, 30. The center shaft 2 is arranged so as to be in non-contact with the peripheral wall of the center shaft 2, and the center shaft 2 of the peripheral wall in which the centrifugal cones of the small cone-shaped cutters 30, 30, 30 and the large cone-shaped cutters 35, 35, 35 are arranged. Each cone shape is set so that the inclination angle θ with respect to the angle is set to 21 °. A small cutter 30, 30, 30 and each cone shaft end of each cone-shaped large cutter 35, 35, 35 are respectively pivoted between holders 5, 5,. I wear it.

    At the center of each cone-shaped small cutter 30, 30, 30 and each cone-shaped large cutter 35, 35, 35, there are center support shafts 32, 32,..., Bearings 33, 33,. ,... Are incorporated and are detachably mounted between the holders 5, 5,..., And in particular, each holder 5, which supports the tip of each cone-shaped small cutter 30, 30, 30. 5 and 5 can be integrated with the tip injection port 26 as shown in FIG. 1, or can also serve as the attachment / detachment mechanism 28 for attaching the tip bit 27 as shown in FIG. Further, as shown in FIGS. 1 to 8, the cutter head 1 is configured such that the tips of the large cone-shaped cutters 35, 35, 35 are adjacent to the proximal ends of the small cone-shaped cutters 30, 30, 30. 1 and FIG. As shown in FIG. 7, the respective cone-shaped small cutters 30, 30, 30 and the cone-shaped large cutters 35, 35, 35 on the circumferential wall of the center shaft 2 face each other and the base ends face each other. Each of the peripheral walls is formed with peripheral wall injection ports 24, 24,... That communicate with the supply pipe line 23, respectively.

(Operation / Effect of Example 1)
As shown in FIG. 9, the cutter head 1 of the present invention having the above-described configuration is suspended and connected so as to be able to be driven and rotated by a rotation drive source 6, for example, a drilling fluid tank or a drilling fluid (70) (not shown). For the tip socket 80 of the hollow excavation shaft 8 suspended from a crane (not shown) of a construction vehicle equipped with a drilling fluid supply source 7 such as a supply pump, a compressor for supplying compressed air, etc. 6 to 8, the connecting mechanism 21 of the center shaft 2 base end 20 is fitted and mounted, and a connecting pin (not shown) is inserted into the connecting hole 22 so as to be concentric, non-rotatable, and detachable. It can be in a startable state.

    As shown in FIGS. 7 to 9, the center shaft 20 supplies the drilling fluid 70 supplied from the drilling fluid supply source 7 through the hollow drilling shaft 8 to the tip injection port 26 and the peripheral wall injection ports 24, 24,. ..., for example, a small-diameter leading hole previously drilled in the surface of the support layer while rotating in a certain direction (as indicated by the arrow in FIG. 8) following the rotation drive source 6 and the hollow excavation shaft 8 When driven in accordance with (not shown), each cone-shaped small cutter 30, 30, 30 and each cone-shaped large cutter 35, 35, 35 revolve around the center shaft 20 and come into contact with the inner peripheral wall of the excavation hole. By the friction of the tips 4, 4,..., The center shaft 20 rotates in the opposite direction, and can be excavated and stirred in the ground, and as shown in FIGS. Deep punching bit Those equipped with a tip bit 27, such as a triple cone bits, it is possible to drill more efficiently also like harder rock.

(Conclusion)
As described above, the cutter head according to the present invention can achieve the intended purpose evenly by its novel configuration, and is easy to manufacture, and various cutter heads, auger heads, and multi-axis type earthing devices. Compared to auger technology, etc., it has greatly improved wear resistance and durability, excellent maintainability, lower maintenance costs, and can be made much more economical, while greatly improving drilling performance. In the past, it took a long time to drill to difficult-to-excavate geology, but the construction and civil engineering industry, the power industry, the telecommunications industry, In addition to the traffic signal and signage industry, it has been highly praised by ordinary households and companies that wish to drastically reduce the time required for laying and restoring lifelines. It is expected to be to go thing.

The drawings show some typical embodiments embodying the technical idea of the cutter head of the present invention.
It is sectional drawing which shows a cutter head. It is a top view which shows a cutter head. It is sectional drawing which shows the AA line part in FIG. It is sectional drawing which shows the BB line part in FIG. It is sectional drawing which shows the CC line | wire part in FIG. It is sectional drawing which shows the cutter head incorporating a front-end | tip bit. It is sectional drawing which shows the cutter head which has a front-end | tip bit. It is a perspective view which shows a cutter head. It is a perspective view which shows the cutter head connected with the hollow excavation shaft.

1 Cutter head 2 Center shaft
20 Same base
21 Same connection mechanism
22 Same connecting hole
23 Supply pipeline
24 Same wall outlet
25 Same tip
26 Same tip injection port
27 Same tip bit
28 Detachable mechanism 3 Conical cutter
30 Same cone-shaped small cutter
31 Same wall
32 Same center spindle
33 Same bearing
34 The same sinking plug
35 Cone-shaped large cutter
36 Same circumferential wall β Inclination angle of conical cutter peripheral wall surface α Conical cutter posture angle θ Inclination angle of conical cutter peripheral wall surface relative to center shaft 4 Tip 5 Holder 6 Rotation drive source 7 Drilling fluid supply source
70 Same drilling fluid 8 Hollow drilling shaft
80 Same tip (socket part)

Claims (4)

    Concentric, non-rotatable with respect to the distal end of a hollow excavation shaft that is suspended and connected to a proximal end of a center shaft formed through a supply pipe and rotatably driven by a rotational drive source, and connected to a drilling fluid supply source A connecting mechanism that can be detachably installed is provided, and a tip injection port that leads to the supply pipe line is formed at the tip of the center shaft. , The vertical cross section of the trapezoidal small inverted cutter with a vertically inverted trapezoidal shape with multiple chips implanted on the peripheral wall. In a predetermined angle posture intersecting the center or its extension line, it is arranged so as to be non-contact with the peripheral wall of the center shaft, and around the base end of the center shaft, it is arranged between each cone-shaped small cutter, Equilibrium around For each degree, a total of a plurality of cone-shaped large cutters having a trapezoidal shape with a vertically inverted trapezoidal cross section and a plurality of chips planted on the peripheral wall, and the extension line of each cone-shaped large cutter tip is the center shaft tip Arranged so as not to contact the peripheral wall of the center shaft at a predetermined angle posture intersecting with the center axis of the flange or its extension line, and both ends of the cutter shaft of each cone-shaped small cutter and each cone-shaped large cutter are connected to the center. Between the holders projecting from the shaft peripheral wall, the shaft is rotatably mounted, and a plurality of conical small cutters and large cone cutters of the center shaft peripheral wall are opposed to the respective peripheral walls from the supply pipe line. A cutter head comprising a plurality of branched peripheral wall injection holes.     Concentric, non-rotatable with respect to the distal end of a hollow excavation shaft that is suspended and connected to a proximal end of a center shaft formed through a supply pipe and rotatably driven by a rotational drive source, and connected to a drilling fluid supply source A connecting mechanism that can be detachably installed is provided, and a tip injection port that leads to the supply pipe line is formed at the tip of the center shaft. , The vertical cross section of the trapezoidal small inverted cutter with a vertically inverted trapezoidal shape with multiple chips implanted on the peripheral wall. In a predetermined angle posture intersecting the center or its extension line, it is arranged so as to be non-contact with the peripheral wall of the center shaft, and around the base end of the center shaft, it is arranged between each cone-shaped small cutter, Equilibrium around For each degree, a total of a plurality of cone-shaped large cutters having a trapezoidal shape with a vertically inverted trapezoidal cross section and a plurality of chips planted on the peripheral wall, and the extension line of each cone-shaped large cutter tip is the center shaft tip Crossed over the axis of the flange or its extension line, arranged at the same angle and posture as each cone-shaped small cutter so as not to contact the center shaft peripheral wall, and each cone-shaped small cutter and each cone-shaped large cutter cutter A plurality of positions where both ends of the shaft are rotatably mounted between the holders protruding from the peripheral wall of the center shaft, and are opposed to the peripheral walls of the small cone cutters and the large cone cutters of the central shaft circumferential wall. The cutter head is characterized in that a plurality of peripheral wall injection ports branched from the supply pipe are formed. The cutter head according to any one of claims 1 and 2 , wherein a tip of each cone-shaped large cutter is disposed adjacent to a base end of each cone-shaped small cutter. The cutter head according to any one of claims 1 to 3 , wherein the center shaft is provided with an attachment / detachment mechanism for attaching a tip bit at a tip injection port thereof.

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