Borehole inner diameter cutting device and method for forming side protrusion of pile using same

Abstract

The present invention relates to a borehole inner diameter cutting device and a method for forming side protrusions of a pile using same. The present invention relates to a borehole inner diameter cutting device comprising: a cutting device portion configured to cut or grind the rock wall inside an excavated borehole to create a space; and an operation driving device portion configured to control the operation of the cutting device unit from the ground. The operation driving device portion is configured to determine the longitudinal position of the cutting device portion through an extension rod and rotate the extension rod continuously or intermittently using the rotational force of a drive motor, thereby controlling the position and cutting speed of the cutting device portion. The cutting device unit comprises: a cutting unit transfer means coupled to the lower end of the extension rod such that the position thereof is determined and configured to operate by means of an externally provided fluid pressure; a cutting motor driven by an externally provided power source; and a cutting member configured to be rotated / driven by the rotational driving force from the cutting motor, thereby cutting or grinding the borehole inner wall. If a fluid pressure is applied, the cutting unit transfer means operates to move the cutting motor toward the borehole inner wall, enabling the cutting member to cut or grind the borehole inner wall to form a space.

Description

A device for cutting the inner diameter of a perforated hole and a method for forming a side projection of a pile using the same

[0001] The present invention relates to a device for cutting the inner diameter of a perforated hole and a method for forming a side projection of a pile using the same, and more particularly, to a device for cutting the inner diameter of a perforated hole and a method for forming a side projection of a pile using the same, which can efficiently widen the diameter by cutting or grinding the side of the lower part of a perforated hole in the ground to bury a pillar in the ground, and further, can secure the stability of the device through the degree of the cutting component.

[0002] Typically, when constructing a foundation for a building, an excavator is used to first dig a hole through the ground, and then concrete is filled in along with steel pipes or steel frames to form columns that are buried in the ground. However, in order to sufficiently withstand the weight of the building and prevent ground subsidence, the hole must be dug as deep as possible or the diameter of the hole must be expanded.

[0003] Figure 1 is a drawing showing a general pile construction device. As in the related technology, Republic of Korea Patent Publication No. 10-2011-0103787, when forming an enlarged bulb, an auger equipped with a bit is inserted into a circular tube and rotates while mutually rotating counterclockwise to penetrate, and at this time, the bit attached to the end of the auger excavates the ground, and the excavated soil rises up the screw rod inserted inside the circular tube and is discharged to the outside.

[0004] To scrape the ground slightly wider than the inside diameter of the pile, or to excavate more widely around the pile tip after drilling, an expansion bit or expansion auger is used. In Figure 1, the "A" portion is where the hammer or bit is replaced at the lower end of the screw-equipped rod.

[0005] A conventional expansion bit or expansion auger is configured with an expansion structure provided on the side of the excavation rod, and is structured to be expanded by the operation of a mechanical device separately provided for forward and reverse rotation or expansion.

[0006] However, conventional expansion augers require a separate, complex mechanical device or hydraulic device to expand or collapse the expansion auger, which causes the hollow space through which air normally passes to be utilized as a space for the operation of the mechanical device or hydraulic device, or requires a complex additional configuration. In addition, since it is configured to be folded during forward rotation and unfolded during reverse rotation, after expansion drilling, the expanded portion must be folded by rotating forward again, but a malfunction occurs in which the expansion auger does not completely collapse, causing problems during the recovery stage.

[0007] Meanwhile, in the case of conventional excavation using a hammer, the upper and lower parts of the hole had to have the same diameter, so there was a problem that it took a lot of time and money to excavate a deep and large hole, and the equipment also had to be large.

[0008] This problem can be solved by introducing equipment that can locally expand only the lower part of the excavated hole. To solve this problem, an "expandable hammer (patent registration no. 10-0928029)" has been proposed.

[0009] FIG. 2 is a drawing for explaining a conventional expansion hammer structure in which expansion is performed with the lifting and lowering block raised. In the case of an "expansion hammer", the lifting and lowering block (400) is raised by a hydraulic cylinder (300) and each air hammer (200) is pushed outward, thereby increasing the excavation radius of the hammer bit (220). However, the following problems exist during construction.

[0010] First, as the lifting and lowering block (400) is raised and lowered, the air hammer (200) rotates and the angle of inclination formed with the hammer body (100) changes, but the lifting and lowering block (400) cannot actively accommodate the change in angle of the air hammer (200), so the outer surface of the lifting and lowering block (400) cannot stably support the outer surface of the air hammer (200) (there is no surface contact between the outer surface of the lifting and lowering block (400) and the outer surface of the air hammer (200), but rather line contact or point contact occurs, causing a problem in load transfer), and there is a problem in that a severe shaking phenomenon occurs during work.

[0011] Second, there is a problem that there is no device to stably support the air hammer (200) as the air hammer (200) is spread out from the outer wall of the hammer body (100) when the hammer expands, and due to this structural instability, eccentricity is applied to the main components such as the hammer and bit when striking for expansion, resulting in a problem that it cannot be used for expanding rock.

[0012] Third, there is a problem that it is difficult to clean up the residue after work because there is no separate means to discharge the sludge.

[0013] Therefore, there is a need for research and development of a new structural device that can expand the side walls of a perforation hole more effectively.

[0014] Prior art literature (patent literature)

[0015] (Patent Document 1) Republic of Korea Patent Publication No. 10-2011-0103787 (published on September 21, 2011)

[0016] (Patent Document 2) Republic of Korea Patent Publication No. 10-2020-0037981 (Published on April 10, 2020)

[0017] (Patent Document 3) Republic of Korea Patent No. 10-0928029 (Published on November 24, 2099)

[0018] (Patent Document 4) Republic of Korea Patent Publication No. 10-0990201 (Published on October 29, 2010)

[0019] (Patent Document 5) Republic of Korea Patent No. 10-1367359 (Published on February 26, 2014)

[0020] (Patent Document 6) U.S. Patent Publication No. 4,271,915 (Published on June 9, 1981)

[0021] Accordingly, the present invention, which aims to solve the above-mentioned conventional problems, provides a device for cutting the inner diameter of a perforated hole, which can efficiently widen the diameter by cutting or grinding the side of the lower part of a perforated hole formed in the ground to bury a pillar in the ground, and further, can secure device stability through the degree of the cutting component, and a method for forming a side projection of a pile using the same.

[0022] The problems solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0023] According to one aspect of the present invention for achieving the above objects and other features of the present invention, there is provided a drilling hole inner diameter cutting device used to expand the diameter of the lower part of an excavation hole, the cutting device comprising: a cutting device part configured to cut or grind rock of an inner wall of an excavation hole to form a space; And a motion driving device configured to control the operation of the cutting device unit on the ground; wherein the motion driving device determines the longitudinal position of the cutting device unit through an extension rod, and is configured to control the position and cutting speed of the cutting device unit by continuously or intermittently rotating the extension rod with the rotational force of a driving motor, and the cutting device unit includes a cutting unit moving means coupled to the lower end of the extension rod to determine the position, and operated by an externally provided fluid pressure, a cutting motor driven by an externally provided power source, and a cutting member configured to cut or grind the inner wall of a drilling hole by rotational driving force of the cutting motor, wherein when fluid pressure is applied, the cutting motor moves toward the inner wall of the drilling hole by the operation of the cutting unit moving means, and the cutting member cuts or grinds the inner wall of the drilling hole to form a space.

[0024] In one aspect of the present invention, the cutting device unit may be configured such that the cutting motor is coupled to the other end of a rotating frame, one end of which is rotatably coupled to an end of a coupling frame coupled to the lower end of the extension rod, and the cutting unit moving means rotates the rotating frame so that the cutting motor moves back and forth in a direction opposite to the direction toward the inner wall of the drilling hole and the direction toward the inner wall of the drilling hole.

[0025] In one aspect of the present invention, the cutting device unit may include a rotating frame having one end rotatably coupled to an output shaft of the cutting motor, a cutting rotation shaft having the other end of the rotating frame rotatably coupled, a cutting member coupled to the cutting rotation shaft, and a drive belt or drive chain connecting the output shaft of the cutting motor and the cutting rotation shaft to transmit the rotational force of the cutting motor to the cutting rotation shaft, so that the cutting unit moving means may rotate the rotating frame so that the cutting member moves back and forth in a direction opposite to a direction toward the inner wall of the drilling hole and a direction toward the inner wall of the drilling hole.

[0026] In one aspect of the present invention, the bearing housing may further be provided at the other end of the rotating frame, wherein a plurality of bearings are provided inside the bearing housing, and the cutting rotation shaft may be configured to be rotatably coupled thereto.

[0027] In one aspect of the present invention, the cutting device part may be configured such that the cutting motor is coupled to the forward and backward driving rod of the cutting unit moving means provided at the end of the coupling frame coupled to the lower end of the extension rod, and moves forward and backward linearly in a direction toward the inner wall of the perforation hole and in a direction opposite to the direction toward the inner wall of the perforation hole.

[0028] In one aspect of the present invention, the present invention may further include a water-cooling chamber having a through-hole through which the cutting motor is surrounded and a power transmission line is passed through; and an output shaft water-cooling means provided between the water-cooling bottom surface and the output shaft while the output shaft of the cutting motor is exposed to the outside by passing through an opening provided in the water-cooling bottom plate of the water-cooling chamber.

[0029] In one aspect of the present invention, a pneumatic injection hole is formed in the water supply chamber, and pneumatic pressure having a pressure higher than the water pressure outside the water supply chamber is injected through the pneumatic injection hole to prevent external water from seeping in.

[0030] In one aspect of the present invention, a differential pressure switch may be further included, one side of which is connected to the outside of the water supply chamber to introduce external pressure, the other side of which is connected to the inside of the water supply chamber to introduce internal pressure, and a pressure difference between the inside and outside is set, and the switch is blocked when the pressure difference is greater than the set pressure difference, and the switch is connected when the pressure difference is less than the set pressure difference, thereby controlling the opening and closing of the electric valve, thereby maintaining the pressure inside the water supply chamber at a certain value or higher than the external pressure.

[0031] In one aspect of the present invention, a pneumatic discharge hole is formed in the water pressure chamber, and a differential pressure valve is provided in the pneumatic discharge hole, wherein the differential pressure valve sets the difference between the external water pressure and the internal pneumatic pressure to a constant value, and when the pneumatic pressure inside the water pressure chamber increases above the set value, the valve opens to discharge the pneumatic pressure and maintain the pressure difference below the set value.

[0032] In one aspect of the present invention, the cutting member may be configured to be arranged in multiple layers on the output shaft of the cutting motor, or may be configured to be arranged in multiple layers on a rotary shaft connected to the output shaft of the cutting motor via a chain or belt.

[0033] In one aspect of the present invention, the motion driving device unit may include a driving motor provided on a support structure provided on the ground to provide continuous or intermittent rotational force; an extension rod having an upper end rotatably connected to a lower portion of the support structure and a lower end to which the cutting device unit is coupled; and the rotational force generated by the driving motor may be transmitted through the extension rod to rotate the cutting device unit.

[0034] In one aspect of the present invention, the extension rod may further include a support and fixing device configured to support and fix the extension rod to the excavation hole.

[0035] In one aspect of the present invention, the support fixing device portion comprises: a rotation permitting means rotatably provided to surround the extension rod; a wall support frame extending from the rotation permitting means toward the inner wall of the perforation hole; and a fixing member provided at an end of the wall support frame; so that when fluid pressure is supplied, the fixing member is brought into close contact with the inner wall of the perforation hole, so that the extension rod is supported and fixed in position with respect to the perforation hole and only allowed to rotate, so that cutting or grinding work can be performed.

[0036] In one aspect of the present invention, the fixing member may be composed of a hydraulic cylinder, a water cylinder, or a pneumatic cylinder whose length increases when fluid pressure is applied.

[0037] In one aspect of the present invention, the cutting member is configured to be arranged in multiple layers in the longitudinal direction, and is configured to move the cutting member in the transverse direction by a forward-backward driving device coupled to the extension rod, and may further include a crushing means configured to directly crush some remaining rock slices after cutting or grinding using the plurality of cutting members.

[0038] According to another aspect of the present invention, there is provided a method for forming a side projection of a pile by expanding the diameter of the lower portion of a perforation hole of an excavated ground, the method comprising: a first step of positioning a cutting device of an inner diameter cutting device according to claim 1 at the lower portion of a perforation hole where a projection is to be formed; a second step of continuously or intermittently rotating the cutting device around the central axis of the perforation hole, supplying fluid pressure to a cutting unit moving means of the cutting device to advance a cutting motor and a cutting member toward the inner wall of the perforation hole while providing power to the cutting motor so that the cutting member cuts or grinds the inner wall of the perforation hole to expand the diameter; a third step of blocking the fluid pressure to return the cutting unit moving means to retract the cutting device member in a direction away from the inner wall of the perforation hole; a fourth step of moving the cutting device member to the outside of the perforation hole; and a fifth step of injecting a filler into the perforation hole.

[0039] In another aspect of the present invention, prior to the first step, a casing is installed to prevent collapse of the wall in the soft upper ground, and then the first and third steps are performed by blocking fluid pressure for vertical movement of the cutting device part inside the drilling hole, thereby retracting the cutting unit moving means, and the cutting member is performed without touching the inner wall of the drilling hole, and between the fourth and fifth steps, removing slime remaining in the lower part of the drilling hole may be further included.

[0040] In another aspect of the present invention, the second step may be performed repeatedly while setting the height of the cutting part differently.

[0041] The device for cutting the inner diameter of a perforation hole according to the present invention and the method for forming a side projection of a pile using the same provide the following effects.

[0042] First, the present invention has a relatively simple structure compared to conventional expansion devices, so it has excellent manufacturing efficiency, and thus has the effect of ensuring economic feasibility.

[0043] Second, the present invention has the effect of significantly improving workability and constructability by enabling easy recovery after inner diameter expansion.

[0044] Third, the present invention has the effect of enabling precise expansion to the designed expansion depth.

[0045] Fourth, the present invention has the effect of being able to expand the hole to have a uniform inner diameter.

[0046] The effects of the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0047] Figure 1 is a drawing showing a conventional pile construction device.

[0048] Figure 2 is a drawing for explaining a conventional expansion hammer structure in which expansion is performed with the lifting and lowering block raised.

[0049] Figure 3 is a drawing showing the configuration of a perforation hole inner diameter cutting device according to the present invention.

[0050] FIG. 4 is a drawing showing a cutting device part of a first embodiment included in a perforation hole inner diameter cutting device according to the present invention.

[0051] FIG. 5 is a drawing showing one embodiment of a cutting member included in a cutting device part of a first embodiment of a perforation hole inner diameter cutting device according to the present invention.

[0052] FIG. 6 is a drawing showing modified examples of a cutting device part of the first embodiment included in a perforation hole inner diameter cutting device according to the present invention, and is a drawing showing part “A” of FIG. 4.

[0053] FIG. 7 is a drawing showing a cutting device part of a second embodiment included in a perforation hole inner diameter cutting device according to the present invention.

[0054] FIG. 8 is a drawing explaining a cutting operation according to a modified example of the cutting device part of the second embodiment shown in FIG. 7.

[0055] FIG. 9 is an exemplary drawing of securing space for an inner diameter (expanded hole) by one embodiment of a cutting member constituting a cutting device section of a second embodiment of a perforation hole inner diameter cutting device according to the present invention.

[0056] FIG. 10 is an exemplary drawing of securing space for an inner diameter (expanded hole) by another embodiment of a cutting member constituting a cutting device section of a second embodiment of a perforation hole inner diameter cutting device according to the present invention.

[0057] Fig. 11 is a drawing showing a crushing means included in a perforation hole inner diameter cutting device according to the present invention.

[0058] FIG. 12 is a drawing showing a cutting device part of a third embodiment of a perforation hole inner diameter cutting device according to the present invention, (A) is a plan view, and (B) is a front view.

[0059] FIG. 13 is a drawing showing an embodiment in which a number unit included in a perforation hole inner diameter cutting device according to the present invention is provided.

[0060] Fig. 14 is a drawing showing a degree unit including a component provided in part “A” of Fig. 13.

[0061] Fig. 15 is a drawing showing a drainage guide groove formed on a drainage bottom plate of a drainage unit included in a drilling hole inner diameter cutting device according to the present invention.

[0062] Fig. 16 is a drawing showing an additional component of a number unit included in a perforation hole inner diameter cutting device according to the present invention.

[0063] Fig. 17 is a drawing showing the configuration of a support and fixing device included in a perforation hole inner diameter cutting device according to the present invention.

[0064] Figure 18 is a cross-sectional view showing a construction process using a method for forming a side projection of a pile using a perforation hole inner diameter cutting device according to the present invention.

[0065] Additional objects, features and advantages of the present invention can be more clearly understood from the following detailed description and accompanying drawings.

[0066] Before going into a detailed description of the present invention, it should be understood that the present invention can be modified in various ways and can have various embodiments, and that the examples described below and illustrated in the drawings are not intended to limit the present invention to specific embodiments, but include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0067] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0068] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0069] Additionally, terms such as “... part,” “... unit,” and “... module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software.

[0070] In addition, when describing with reference to the attached drawings, identical components will be assigned the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted. When describing the present invention, if a detailed description of a related known technology is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0071] Hereinafter, a preferred embodiment of a perforation hole inner diameter cutting device and a method for forming a side projection of a pile using the same according to the present invention will be described in detail with reference to the attached drawings. In the following description, securing space by "cutting" includes securing space by "cutting with a cutter" and securing space by "grinding." In other words, it means securing space by cutting or grinding the inner wall of a perforation hole.

[0072] First, the device for cutting the inner diameter of a perforation hole according to the present invention will be described in detail with reference to FIGS. 3 to 6.

[0073] FIG. 3 is a drawing showing the configuration of a drilling hole inner diameter cutting device according to the present invention, FIG. 4 is a drawing showing a cutting device part of a first embodiment included in a drilling hole inner diameter cutting device according to the present invention, FIG. 5 is a drawing showing one embodiment of a cutting member included in a cutting device part of a first embodiment included in a drilling hole inner diameter cutting device according to the present invention, and FIG. 6 is a drawing showing modified examples of a cutting device part of a first embodiment included in a drilling hole inner diameter cutting device according to the present invention, and is a drawing showing part “A” of FIG. 4.

[0074] The drilling hole inner diameter cutting device according to the present invention is an inner diameter cutting device used to expand (or enlarge) the diameter of the lower part of an excavated drilling hole, and as shown in FIGS. 3 to 6, it largely includes a motion driving device unit (100); and a cutting device unit (200).

[0075] Specifically, the drilling hole inner diameter cutting device according to the present invention is an inner diameter cutting device used to expand (or enlarge) the diameter of the lower part of an excavated drilling hole, and includes, as shown in FIGS. 3 to 6, a motion driving device unit (100) configured to control the operation of a cutting device unit (200) on the ground; and a cutting device unit (200) configured to cut or grind the rock of the inner wall of the excavated drilling hole to form a space under control of the motion driving device unit (100).

[0076] The above motion driving device unit (100) is a component configured to control the operation of the cutting device unit (200) coupled to the lower end of the extension rod (140) constituting the motion driving device unit (100).

[0077] Specifically, the above-described motion driving device unit (100) is provided on a support structure (110) provided on the ground, and includes a driving motor (120) that provides continuous or intermittent rotational force, and an upper end rotatably coupled to the support structure (110), and a cutting device unit (200) coupled to the lower end, so that the driving force of the driving motor (120) is transmitted through a gear train (130) to rotate the rotating extension rod (140).

[0078] The above extension rod (140) is connected so that it can be extended to match the depth of the perforation hole, and its lowermost part is coupled to the cutting device unit (200). In other words, the motion driving device unit (100) determines the longitudinal (including vertical) position of the cutting device unit (200) through the extension rod (140).

[0079] Here, the extension rod (140) is provided in the form of a hollow pipe and can be configured to supply pressure fluid (e.g., hydraulic pressure or pneumatic pressure) to the cutting device unit (200) through its interior.

[0080] This motion driving device (100) continuously or intermittently rotates the extension rod (140) by the rotational force of the driving motor (120), and the fluid pressure provided through a compressor (P) such as a pneumatic compressor, an inlet compressor, or a hydraulic compressor is supplied to the cutting device (200) through a communication path inside the extension rod (140), thereby driving the cutting motor (221) constituting the cutting device (200).

[0081] Here, the cutting motor (221) may be configured as a motor that uses hydraulic pressure or pneumatic pressure, and the cutting unit moving means (230) and the fixing member (330) of the support fixing device (300) to be described below may be configured as a single-acting cylinder that operates with hydraulic pressure or pneumatic pressure, and may be configured as a motor that uses electricity provided from the outside as a power source.

[0082] Here, the single-acting cylinder is configured with a return spring inside the cylinder.

[0083] Next, the cutting device unit (200) is a component configured to cut or grind the rock on the inner wall of an excavation hole to form a space by being controlled by the motion driving unit (100).

[0084] Specifically, the cutting device unit (200) includes a coupling frame (210) coupled to the lower end of the extension rod (140) of the motion driving device unit (100), a cutting unit (220) provided at each end of the coupling frame (210) to cut or grind the rock of the inner wall of the excavation hole, and a cutting unit moving means (230) configured to move the cutting unit (220) toward the inner wall of the excavation hole.

[0085] The above cutting unit (220) includes a cutting motor (221) driven by an externally provided power source, and a cutting member (222) coupled to a rotating output shaft (251) of the cutting motor (221).

[0086] The cutting member (222) is provided with cutting edges (222a, 222b) along the edge shown in FIG. 5. When the cutting member (222) is viewed horizontally, the cutting edges (222a, 222b) are configured to have alternately different heights with respect to the cutting direction, that is, adjacent cutting edges (222a, 222b) can be provided alternately and offset from the center. That is, the cutting edges (222a, 222b) provided at the edge of the cutting member body (222c) can be provided alternately with different heights. Accordingly, the cutting member (222) can widen the cutting range.

[0087] The cutting unit (220) has a cutting motor (221) coupled to the other end of a rotating frame (223) that is rotatably coupled to one end of a connecting frame (210), and the rotating frame (223) is rotated by a forward and backward moving rod of the cutting unit moving means (230) so that the cutting motor (221) moves in the opposite direction to the inner wall of the perforation hole.

[0088] Here, the cutting unit moving means (230) is configured as a single-acting cylinder to provide a force for the cutting motor (221) to move toward the inner wall of the perforation hole, and when the fluid supply to the single-acting cylinder is cut off, the cutting motor can be configured to move in the opposite direction to the direction toward the inner wall of the perforation hole by the operation of a spring.

[0089] In addition, the cutting unit moving means (230) can be configured to start cutting the inner wall while the cutting motor (221) rotates at a certain rotation speed or higher by supplying the pressure fluid to the cutting motor (221) through a pressure fluid pipe (not shown) that can be controlled separately from the pressure fluid supplied to the cutting motor (221).

[0090] In addition, the cutting unit moving means (230) is configured as a double-acting hydraulic or pneumatic cylinder that provides the cutting motor (221) with a force to move in the direction of the inner wall of the perforation hole, and can be configured to change the direction of fluid supply to the double-acting cylinder so that the cutting motor (221) moves in the opposite direction to the direction toward the inner wall of the perforation hole.

[0091] Meanwhile, the cutting device unit (200) may further include a cutting depth adjustment means configured to limit the cutting depth of the inner wall of the perforation hole by limiting the rotation angle of the rotating frame (223).

[0092] As shown in (A) of Fig. 6, the above cutting depth adjustment means is composed of a stop cable (232) of a certain length provided between the rotating frame (223) and the connecting frame (210) or the extension rod (140), and can limit the cutting depth of the inner wall of the perforation hole by limiting the rotation angle of the rotating frame (223).

[0093] In addition, as shown in (B) of FIG. 6, the cutting depth adjustment means is provided with a support plate (211) on one side of the connecting frame (210), and a plurality of stop pin fixing holes are formed at regular intervals in the rotational direction of the rotational frame (223) on the support plate (211), and by selectively fixing stop pins (231) to the support pin fixing holes, the rotational angle of the rotational frame (223) is limited, thereby limiting the cutting depth of the inner wall of the perforation hole.

[0094] Next, the cutting device part of the second embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a drawing showing the cutting device part of the second embodiment included in the drilling hole inner diameter cutting device according to the present invention, and FIG. 8 is a drawing explaining a cutting operation according to a modified example of the cutting device part of the second embodiment shown in FIG. 7.

[0095] The cutting device unit (200) of the second embodiment may be configured such that a cutting motor (221) is coupled to a rod of a cutting unit moving means provided in a combination frame (210) to move forward and backward linearly in a direction toward the inner wall of the perforation hole and in a direction opposite to the direction toward the inner wall of the perforation hole.

[0096] Here, the cutting device unit (200) is provided on each of the connecting frames (210) provided on the extension rod (210) at a predetermined interval, for example, 90° or 180°, and as shown in FIG. 8, one cutting member (222) is inclined downward 45° (+45°) with respect to the inner wall of the perforation hole ((A) of FIG. 8), and the other cutting member (222) is inclined upward 45° (-45°) with respect to the inner wall of the perforation hole ((B) of FIG. 8), and can be configured to be movable by the cutting unit moving means (230). The angle of the cutting member can be changed depending on the cross-sectional shape of the desired protrusion.

[0097] In this configuration, an upward cut is first made by a cutting device (200) on one side, and a downward cut is made secondarily by rotating an extension rod (140) to the first cut by a cutting device (200) on the other side, thereby forming an expanded space on the inner wall of the perforation hole.

[0098] The above cutting motor (221) may be configured as a pressurized rotary motor operated by fluid pressure, preferably by fluid pressure supplied through the extension rod (140), and may also be configured as an electric motor.

[0099] In the second embodiment described above, the cutting member (222) may be configured with the same structure as the alternate cutting blades (222a, 222b) described above.

[0100] Meanwhile, FIGS. 9 and 10 are exemplary drawings showing securing space for the inner diameter (expanding hole) by means of embodiments of cutting members constituting the cutting device section of the second embodiment of the drilling hole inner diameter cutting device according to the present invention. FIG. 11 is a drawing showing a crushing means included in the drilling hole inner diameter cutting device according to the present invention.

[0101] The cutting member (222) of the above cutting unit (220) may be formed in a blunt arrow shape or an arrow shape at the front end, as shown in FIG. 9, and is not particularly limited as long as it has a shape or shape that can grind the inner wall of the perforation hole while rotating.

[0102] In addition, the cutting member (222) of the cutting unit (220) may be configured with multiple cutting blades arranged in multiple layers on the output shaft (251) of the cutting motor (221), as shown in FIG. 10.

[0103] Here, the cutting member (222) has multiple cutting blades with different diameters arranged in multiple layers with intervals on the output shaft (251) of the cutting motor (221), and at this time, the shape of the protrusion formed on the side wall of the perforation hole can be adjusted by varying the degree of protrusion of each cutting blade.

[0104] In addition, the inner diameter cutting device of the present invention may further include a crushing means (224) for crushing the rock slide (3) so as to crush some remaining rock slices (3) after cutting or grinding using a plurality of cutting members (223) as shown in FIG. 11.

[0105] The above crushing means (224) may be formed as a crushing member provided in a driving device capable of being driven forward and backward (for example, a component such as the above-described rotating frame (223) or cutting unit driving means) in one embodiment, and may be configured to directly crush a rock slice by the rotation of the extension rod (140).

[0106] The above crushing means (224) may be configured as a member having a V-shaped or wedge-shaped cross-section inserted between the rock slices (3) so as to break the upper and lower remaining slices between the rock slices (3).

[0107] The above crushing means (224) is equipped with a disc with a V-shaped cross-section that can rotate around a central axis, and uses a cylinder that operates with fluid pressure and has one end fixed to the extension rod (140) or cutting device (200) to push a wedge member between the rock slices (3) to break and remove the rock slices (3). Here, by rotating the extension rod (140) while the crushing means (224) is inserted between the rock slices (3), continuous crushing can be performed.

[0108] Here, the crushing means (224) can be configured in a V shape with a thickness that is asymmetrical from top to bottom so as to crush multiple rock slices (3) simultaneously.

[0109] In the description of the above-mentioned cutting device unit (100), the cutting member (222) is described as being directly provided on the output shaft of the cutting motor (221), but the cutting member (222) may be provided on a rotating shaft whose upper and lower ends are rotatably installed on a support bracket, and the rotating shaft may be configured to be connected to the output shaft of the cutting motor (221) through a chain or belt, etc.

[0110] Specifically, FIG. 12 is a drawing showing a cutting device section of a third embodiment of a perforation hole inner diameter cutting device according to the present invention, (A) is a plan view and (B) is a front view. In the description of the third embodiment, the same components as those in the above-described embodiments are given the same reference numerals.

[0111] The cutting device unit (200) of the third embodiment, as shown in FIG. 12, includes a cutting motor (221) provided on one side of a coupling frame (210) coupled to the lower end of an extension rod (140), a rotation frame (223) having one end rotatably coupled to an output shaft (251) of the cutting motor (221), a cutting rotation shaft (225) coupled to the other end of the rotation frame (223) rotatably, a cutting member (222) coupled to the cutting rotation shaft (224), a drive belt or drive chain (not shown) connecting the output shaft (251) of the cutting motor (221) and the cutting rotation shaft (225) to transmit the rotational force of the cutting motor (221) to the cutting rotation shaft (225), and a cutting unit moving means (230) configured to move the other end of the rotation frame (223) toward the inner wall of a drilling hole.

[0112] The cutting device (200) of this third embodiment is configured such that the cutting unit moving means (230) rotates the rotating frame (223) so that the cutting member (222) moves back and forth in the direction opposite to the direction toward the inner wall of the perforation hole and the direction toward the inner wall of the perforation hole.

[0113] Here, the other end of the above-mentioned rotating frame (223) further includes a bearing housing (226), and a plurality of bearings (227) are provided inside the bearing housing (226), and the cutting rotation shaft (225) is rotatably coupled thereto.

[0114] The cutting device unit (200) of the third embodiment may be configured to include components described in the cutting device units of the first and second embodiments, for example, components that can limit the cutting depth of the inner wall of the perforation hole by limiting the rotation angle of the rotating frame (223), and a detailed description thereof is omitted for simplicity and clarity.

[0115] Meanwhile, in the present invention, the cutting device unit (200) may be configured to further include a plurality of wall contact means provided on the opposite side of the cutting blade (222a, 222b) to prevent shaking due to rotation of the cutting blade.

[0116] The above wall contact means can be configured to contact or detach from the wall by the operation of the fluid cylinder.

[0117] Additionally, for example, the wall contact means may be configured to rotate around a hinge portion by the operation of the fluid cylinder so that the contact portion contacts or detaches from the wall.

[0118] Meanwhile, the drilling hole inner diameter cutting device according to the present invention may further include a water drain unit (240) for draining the cutting motor (221) of the cutting device unit (200) from water (friction cooling water, groundwater, etc.) present in the drilling hole.

[0119] FIG. 13 is a drawing showing an embodiment in which a water level unit included in a drilling hole inner diameter cutting device according to the present invention is provided, FIG. 14 is a drawing showing a water level unit including a component provided in part "A" of FIG. 13, FIG. 15 is a drawing showing a drainage guide groove formed in a water level bottom plate of a water level unit included in a drilling hole inner diameter cutting device according to the present invention, and FIG. 16 is a drawing showing an additional component of a water level unit included in a drilling hole inner diameter cutting device according to the present invention.

[0120] The above-mentioned water supply unit (240) includes a water supply chamber (241) that surrounds the cutting motor (221) and has a through-hole for allowing a wire (249) to pass through, a water supply base plate (242) that is provided on the bottom of the water supply chamber (241) and through which the output shaft (251) of the cutting motor (221) passes, and an output shaft water supply means (250) that is provided between the water supply base surface (242) and the output shaft (251) while the output shaft (251) is exposed to the outside by passing through an opening (243) provided in the water supply base plate (242) of the water supply chamber (241).

[0121] In addition, the above-mentioned water supply unit (230) may be configured to have a pneumatic injection hole (244) formed in the water supply chamber (241) to inject pneumatic pressure having a pressure higher than the water pressure outside the water supply chamber (241) so that external water does not seep in.

[0122] In addition, a drainage guide groove (245) surrounding an opening (243) is formed in the drainage floor plate (242) inside the above-mentioned drainage chamber (241), so that water that has seeped around the output shaft drainage means (250) is guided to the drainage guide groove (245) and collected in a reservoir (246) provided below the drainage chamber (241).

[0123] The above reservoir (246) is equipped with a check valve (248) to prevent external water from penetrating, and water collected in the reservoir (246) is discharged to the outside through the check valve (248) when air pressure exceeding the surrounding water pressure is applied through the air injection hole (244).

[0124] The above-mentioned check valve (238) may be configured as a check valve that allows flow in one direction and blocks flow in the opposite direction, for example, but is not limited thereto.

[0125] The above output shaft order means (250) may be an O-ring alone or an O-ring with a backup ring, and may be composed of a retainer or a mechanical seal, etc.

[0126] That is, the output shaft sealing means (250) may be configured to include an O-ring (252) or a combination of an O-ring and a backup ring (253) or a sealing member such as a retainer or a mechanical seal, which is provided in a form that surrounds the output shaft (251), and a sealing housing (254) that surrounds the sealing member.

[0127] In addition, the above-described water supply unit (240) may further include a differential pressure switch (not shown) that has one side connected to the outside of the water supply chamber (241) to introduce external pressure, and the other side connected to the inside of the water supply chamber (241) to introduce internal pressure, sets a pressure difference between the inside and outside, blocks the switch when the pressure difference is greater than the set pressure difference, and connects the switch when the pressure difference is less than the set pressure difference, thereby controlling the opening and closing of the electric valve, thereby maintaining the pressure inside the water supply chamber at a certain value or higher than the external pressure.

[0128] In addition, a pneumatic discharge hole is formed in the above-mentioned pressure chamber (241), and a pressure differential valve is provided in the pneumatic discharge hole.

[0129] Here, the differential pressure valve sets the difference between the external water pressure and the internal air pressure to a constant value, and when the air pressure inside the water pressure chamber increases above the set value, the valve opens to discharge the air pressure and maintain the pressure difference below the set value.

[0130] The above differential pressure valve is a valve that sets the difference between external water pressure and internal air pressure, and when the internal air pressure rises above the set value, the valve opens to discharge the air pressure and maintain the pressure difference below the set value.

[0131] Meanwhile, the device for cutting the inner diameter of a perforated hole according to the present invention may further include a support and fixing device (300) provided on an extension rod to stably support and fix the extension rod.

[0132] Fig. 17 is a drawing showing the configuration of a support and fixing device included in a perforation hole inner diameter cutting device according to the present invention.

[0133] The above-mentioned support fixing device (300) includes a rotation permitting means (310) that surrounds an extension rod (140) and is rotatably provided on the extension rod (140), a wall support frame (320) that extends from the rotation permitting means (310) toward the inner wall of the perforation hole, and a fixing member (330) that is provided at an end of the wall support frame (320). When fluid pressure is supplied, the fixing member (3330) is brought into close contact with the inner wall of the perforation hole, so that cutting or grinding work is performed while being fixed to the inner wall of the perforation hole without shaking.

[0134] The above rotation permitting means may be composed of a bearing member, and the fixing member (330) may be composed of a hydraulic cylinder. That is, the fixing member (330) may be composed of a hydraulic cylinder, a water cylinder, or a pneumatic cylinder whose length increases when fluid pressure is applied.

[0135]

[0136] *In addition, the fixing member (330) may be configured as a single-acting cylinder whose one end is connected to the wall support frame (320) and whose other end is in contact with the inner wall of the perforation hole when fluid pressure is supplied and is spaced a certain distance from the inner wall of the perforation hole when fluid pressure is blocked.

[0137] The above-mentioned support fixing device (300) can be configured on at least one extension rod (140) of the lowermost cutting motor and the uppermost cutting motor.

[0138] Next, a method for forming a side projection of a pile using a perforation hole inner diameter cutting device according to the present invention described above will be described with reference to FIG. 18.

[0139] Figure 18 is a cross-sectional view showing a construction process using a method for forming a side projection of a pile using a perforation hole inner diameter cutting device according to the present invention.

[0140] The method for forming a side projection of a pile using a drilled hole inner diameter cutting device according to the present invention comprises, as shown in FIG. 18, a first step of positioning a cutting device unit (200) included in the above-described inner diameter cutting device below a drilled hole in which a projection is to be formed; a second step of operating a driving device unit (100) to continuously or intermittently rotate the cutting device unit (200) around the central axis of the drilled hole, and supplying fluid pressure such as hydraulic pressure, inflow, or pneumatic pressure to a fluid pressure cylinder of a cutting unit moving means (230) of the cutting device unit (200) to advance the cutting motor (221) and the cutting member (222) toward the inner wall, thereby providing power to the cutting motor (221) so that the cutting member (222) cuts or grinds the inner wall of the drilled hole to widen the diameter; It includes a third step of retracting the cutting device unit (200) away from the inner wall of the perforation hole by blocking the fluid pressure and returning the fluid pressure cylinder of the cutting unit moving means (230); a fourth step of moving the cutting device unit (200) to the outside of the perforation hole; and a fifth step of injecting a filler into the perforation hole.

[0141] In addition, the method for forming a side projection of a pile of the present invention is performed after a casing is installed to prevent collapse of the hole wall in the soft upper ground before the first step, and the first and third steps are performed by blocking hydraulic or pneumatic pressure for the vertical movement of the cutting device (200) inside the drilling hole to retract the cutting unit moving means (230) of the cutting unit moving means (230) so that the cutting member (222) does not touch the inner wall of the drilling hole.

[0142] In addition, the method for forming a side projection of a pile of the present invention may further include removing slime remaining in the lower part of the perforation hole between the fourth and fifth steps.

[0143] In addition, in the method for forming a side projection of a pile of the present invention, the second step can be repeatedly performed while setting the height of the cutting portion differently.

[0144] In addition, in the method for forming a side projection of a pile of the present invention, the method may further include a step 2-1 of temporarily blocking the fluid pressure of the support and fixing device part (300) after the end of the second step and then providing it again so that the support and fixing device part (300) is detached from the inner wall of the perforation hole and then fixed again; and a step 2-2 of removing some rock slices (3) remaining between the plurality of cutting members (222) by rotating the second step or cutting device part in reverse after the end of the second step, or a step 2-3 of removing some rock slices (3) remaining between the plurality of cutting members (222) by rotating the cutting device part (200) in reverse while maintaining the rotation of the cutting motor (221) after the end of the second step.

[0145] The above 2-1 step is configured such that the fixing member (330) of the support fixing device (300) is a single-acting cylinder that operates by hydraulic pressure or pneumatic pressure. The single-acting cylinder is provided with a return spring inside the cylinder, so that when fluid pressure is supplied, the fixing member (330) comes into contact with the inner wall of the perforation hole, and when the fluid pressure is cut off, it is separated from the inner wall of the perforation hole by a certain distance and then fixed again.

[0146] The embodiments described in this specification and the attached drawings are merely illustrative of some of the technical concepts encompassed by the present invention. Therefore, the embodiments disclosed in this specification are intended to illustrate, rather than limit, the technical concepts of the present invention. Therefore, it is self-evident that the scope of the technical concepts of the present invention is not limited by these embodiments. All modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical concepts contained in the specification and drawings of the present invention should be construed as being included within the scope of the rights of the present invention.

[0147] The present invention relates to a device for cutting the inner diameter of a perforated hole and a method for forming a side projection of a pile using the same. Specifically, the device can efficiently widen the diameter of a bottom side of a perforated hole in the ground formed by cutting or grinding in order to bury a pillar in the ground, and further, can secure device stability through the number of cuts in the cutting component, so that it has industrial applicability.

Claims

1. A drilling hole inner diameter cutting device used to expand the diameter of the lower part of the excavated drilling hole. A cutting device configured to cut or grind the rock on the inner wall of an excavation hole to form a space; and It includes a motion driving device configured to control the operation of the cutting device on the ground; The above-mentioned motion driving device determines the longitudinal position of the cutting device through the extension rod, and is configured to control the position and cutting speed of the cutting device by continuously or intermittently rotating the extension rod with the rotational force of the driving motor. The above cutting device part includes a cutting unit moving means that is coupled to the lower end of the extension rod to determine its position and operates by fluid pressure provided from the outside, a cutting motor driven by a power source provided from the outside, and a cutting member configured to cut or grind the inner wall of a perforation hole by being rotated by the rotational driving force of the cutting motor. The above cutting unit moving means is configured with a double-acting hydraulic or pneumatic cylinder that provides the cutting motor with a force to move in the direction of the inner wall of the drilling hole, and is configured to change the direction of fluid supply to the double-acting hydraulic or pneumatic cylinder so that the cutting motor moves in the direction opposite to the direction toward the inner wall of the drilling hole. A device for cutting an inner diameter of a perforation hole, characterized in that when fluid pressure is applied, the cutting motor moves toward the inner wall of the perforation hole by the operation of the cutting unit moving means, and the cutting member cuts or grinds the inner wall of the perforation hole to form a space.

2. In paragraph 1, The above cutting device part, A drilling hole inner diameter cutting device characterized in that the cutting motor is coupled to the other end of a rotary frame, one end of which is rotatably coupled to the end of a coupling frame coupled to the lower end of the extension rod, and the rotary frame is rotated by the cutting unit moving means so that the cutting motor moves back and forth in the direction opposite to the direction toward the inner wall of the drilling hole and the direction toward the inner wall of the drilling hole.

3. In paragraph 1, The above cutting device part, Including a rotary frame having one end connected to the output shaft of the cutting motor as a rotary material, a cutting rotary shaft connected to the other end of the rotary frame as a rotary material, a cutting member connected to the cutting rotary shaft, and a drive belt or drive chain connecting the output shaft of the cutting motor and the cutting rotary shaft to transmit the rotational force of the cutting motor to the cutting rotary shaft. A drilling hole inner diameter cutting device characterized in that the cutting unit moving means is configured to rotate the rotating frame so that the cutting member moves back and forth in a direction opposite to the direction toward the inner wall of the drilling hole and the direction toward the inner wall of the drilling hole.

4. In paragraph 3, A device for cutting an inner diameter of a perforated hole, characterized in that it further includes a bearing housing provided at the other end of the above-mentioned rotating frame, wherein a plurality of bearings are provided inside the bearing housing, and the cutting rotation axis is rotatably coupled thereto.

5. In paragraph 1, The above cutting device part A drilling hole inner diameter cutting device characterized in that the cutting motor is coupled to the front-back driving rod of the cutting unit moving means provided at the end of the coupling frame coupled to the lower end of the extension rod, and is configured to move forward and backward linearly in a direction toward the inner wall of the drilling hole and in a direction opposite to the direction toward the inner wall of the drilling hole.

6. In paragraph 1, A discharge chamber having a through-hole surrounding the cutting motor and through which a power transmission line passes; and A drilling hole inner diameter cutting device characterized in that it further includes an output shaft cutting means provided between the output shaft and the output shaft while the output shaft of the cutting motor is exposed to the outside by penetrating an opening provided in the bottom plate of the bottom chamber.

7. In paragraph 6, A drilling hole inner diameter cutting device characterized in that a pneumatic injection hole is formed in the above-mentioned water chamber, and pneumatic pressure having a pressure higher than the water pressure outside the above-mentioned water chamber is injected through the pneumatic injection hole to prevent external water from seeping in.

8. In paragraph 6 or 7, A drilling hole inner diameter cutting device characterized in that one side is connected to the outside of the water chamber to introduce external pressure, the other side is connected to the inside of the water chamber to introduce internal pressure, and a differential pressure switch is further included to control the opening and closing of the electric valve by setting the pressure difference between the inside and outside, blocking the switch when the pressure difference is greater than the set pressure difference, and connecting the switch when the pressure difference is less than the set pressure difference, thereby maintaining the pressure inside the water chamber at a certain value or higher than the external pressure.

9. In paragraph 8, A drilling hole inner diameter cutting device characterized in that a pneumatic discharge hole is formed in the above-mentioned water chamber, and a differential pressure valve is provided in the pneumatic discharge hole, wherein the differential pressure valve sets the difference between the external water pressure and the internal pneumatic pressure to a constant value, and when the pneumatic pressure inside the water chamber increases above the set value, the valve opens to discharge the pneumatic pressure and maintain the pressure difference below the set value.

10. In paragraph 1, The above cutting member A drilling hole inner diameter cutting device characterized in that it is configured in a multi-layer arrangement on the output shaft of the cutting motor or in a multi-layer arrangement on a rotary shaft connected to the output shaft of the cutting motor via a chain or belt.

11. In paragraph 1, The above motion driving device unit is, A drive motor provided on a support structure installed on the ground to provide continuous or intermittent rotational power; The upper part is rotatably connected to the lower part of the support structure, and the lower part includes the extension rod to which the cutting device part is coupled; A drilling hole inner diameter cutting device characterized in that the rotational force generated by the driving motor is transmitted through the extension rod to rotate the cutting device unit.

12. In paragraph 1, A drilling hole inner diameter cutting device characterized in that it further includes a support and fixing device provided on the above extension rod and configured to support and fix the extension rod with respect to the drilling hole.

13. In paragraph 12, The above support fixing device part A rotation permitting means that is provided to be rotatable and surround the above extension rod; A perforation hole inner wall support frame extending from the above rotation permitting means; and Equipped with a fixing member provided at the end of the above-mentioned wall support frame; A device for cutting an inner diameter of a perforation hole, characterized in that when fluid pressure is supplied, the fixing member is pressed against the inner wall of the perforation hole, and the extension rod is fixed in position with respect to the perforation hole and only rotation is permitted, thereby performing cutting or grinding work.

14. In paragraph 13, A drilling hole inner diameter cutting device characterized in that the above fixing member is composed of a hydraulic cylinder, a water cylinder, or a pneumatic cylinder whose length increases when fluid pressure is applied.

15. In paragraph 1 or paragraph 3, The above cutting member is configured to be arranged in multiple layers in the longitudinal direction, A drilling hole inner diameter cutting device characterized in that it further includes a crushing means configured to move the cutting member laterally by a forward / backward driving device coupled to the extension rod, and configured to directly crush some remaining rock slices after cutting or grinding using a plurality of the cutting members.

16. A method for forming a side projection of a pile by expanding the diameter of the lower part of a perforated hole in the excavated ground, A first step of positioning a cutting device portion of an inner diameter cutting device according to claim 17 at the bottom of a perforation hole to form a protrusion; A second step in which the cutting device unit is continuously or intermittently rotated around the central axis of the drilling hole, fluid pressure is supplied to the cutting unit moving means of the cutting device unit to advance the cutting motor and cutting member toward the inner wall of the drilling hole, and power is provided to the cutting motor so that the cutting member cuts or grinds the inner wall of the drilling hole to expand the diameter; A third step of blocking the fluid pressure to return the cutting unit moving means and retract the cutting device part away from the inner wall of the perforation hole; A fourth step of moving the cutting device part outside the perforation hole; and A method for forming a side projection of a pile, characterized in that it comprises a fifth step of injecting a filler into a perforation hole.

17. In paragraph 16, Before the above first stage, the casing is installed to prevent the collapse of the wall in the soft ground above, and then executed. The first and third steps are performed by blocking the fluid pressure to move the cutting device up and down inside the perforation hole, thereby retracting the cutting unit moving means, and the cutting member does not touch the inner wall of the perforation hole. A method for forming a side projection of a pile, characterized in that it further comprises removing slime remaining in the lower part of the perforation hole between the fourth and fifth steps.

18. In paragraph 16 or 17, A method for forming a side projection of a pile, characterized in that the second step is repeatedly performed while setting the height of the cutting part differently.

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