JP2018083287A - Boring method using water jet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring method using a water jet device which can efficiently drill a hole having a desired diameter while avoiding a buried object even if there is a buried object.SOLUTION: A method for boring an object 2 using a water jet device having a lance is provided, including: a step of attaching a first nozzle holder for a small bore diameter to a tip of the lance, jetting a high-pressure jet having at least an axial direction component from the first nozzle holder thereby drilling a small bore diameter hole 41; and a step of attaching a second nozzle holder 13B for enlarging diameter to a tip of a lance 11A, jetting a high pressure jet having at least a radial direction component from the second nozzle holder 13B, causing a water jet body 4 to advance along a guide body 3 while enlarging a diameter of the small bore diameter hole 41, thereby drilling a large bore diameter hole 42.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a water jet device that injects a high-pressure jet to drill an object and a drilling method using the water jet device, and is a technique that is particularly suitable when the drilling length is long or the drilling diameter is large. .

  When carrying out fishing, cutting, or drilling of a structure, a jet (water jet) ejected at a high flow rate by applying energy to water by an ultrahigh pressure pump may be used. The water jet method includes a narrow water jet method in which only water is ejected without mixing abrasives, and an abrasive jet method in which abrasives are mixed into water and ejected. The abrasive jet method is suitable for mainly disassembling and cutting structures because it can cut metal such as reinforcing bars and steel frames. On the other hand, the water jet method using only water is the crushing of concrete (removal of deteriorated parts, forming process, roughening, drilling, etc.), peeling of coating film with metal or concrete as the base, piping or heat exchanger It can be used for cleaning and the like, and only concrete can be crushed without damaging the reinforcing bars and the like, and therefore it is suitable mainly for repairing and reinforcing structures.

  In such a water jet method, the cutting ability or crushing ability of the water jet from a nozzle at a fixed position is attenuated by distance, so when crushing a wide area or drilling a deep hole, it matches the crushing area. It is necessary to move the nozzle. Patent Document 1 discloses a drilling device and a drilling method that have a single nozzle provided on a rod, ensure a large hole diameter, and efficiently perform cutting and drilling corresponding to the state of a cutting section. In the water jet method in which abrasives are mixed, or in which no abrasives are mixed, a jet nozzle is provided by attaching a jet angle variable mechanism to the casing rod, and the jet nozzle angle is arbitrarily set or changed arbitrarily. Further, there is disclosed a method of drilling a hole while rotating and moving the casing rod forward and backward.

JP-A-11-90832

  However, in the water jet device disclosed in Patent Document 1, since the jet angle is provided and the jet nozzle is provided, the device becomes complicated and a failure is likely to occur. Moreover, there is a possibility that a desired hole diameter cannot be ensured because the angle of the jet nozzle cannot be changed due to crushing waste (such as aggregate). In addition, when the drilling length is long, the rotating casing rod swings and the hole diameter becomes large, resulting in a decrease in drilling efficiency, or the casing rod or jet nozzle touching the inner wall surface of the hole and being damaged or worn. There is a risk that.

  Further, the water jet device of Patent Document 1 has the following problems. That is, in this water jet apparatus, a hole having a predetermined diameter is dug while changing the angle of the jet nozzle. However, when drilling holes without damaging existing objects such as reinforcing steel bars and PC steel wires, such as when drilling holes for reinforcing PC steel wires, their positions are unclear. In some cases, if a hole with a predetermined diameter is dug at a time, if it hits a buried object on the way, it must be repositioned from the beginning and the construction efficiency is poor.

  In view of such a background, it is a first object of the present invention to provide a water jet device that has a simple configuration, is unlikely to cause a failure, can secure a desired hole diameter, and has a high drilling efficiency. The present invention also provides a drilling method using a water jet device capable of efficiently drilling a hole having a desired diameter while avoiding the buried object even if the buried object exists. Let it be the second issue.

  In order to solve the first problem, the present invention is a water jet apparatus (1) for injecting a high-pressure jet to make a hole in the object (2). A fixed guide body (3), a swivel holder (10) provided slidably on the guide body and holding a swivel (9), and a liquid supplied from the swivel connected to the swivel A lance (11) having a flow passage (11a) formed therein, a nozzle holder (13) provided at the tip of the lance and ejecting the liquid (12), and the swivel holder A fixed drive source (14) for rotationally driving the lance, a guide pipe (15) fixed to the swivel holder so as to surround the lance, and rotatably holding the lance, and the guide pie The a configuration having a pipe guide (8) slidably held in the axial direction.

  According to this configuration, the liquid ejected from the nozzle while the drive source rotationally drives the lance crushes the object into a circular cross section, and the swivel holder slides along the guide body, so that the object is desired. Can be drilled. Since the lance is surrounded by the guide pipe and the lance is rotated inside the guide pipe by the drive source, it is difficult for a failure to occur. Even when the drilling length is long, the rotating lance is held by the guide pipe so that it does not sway, the hole diameter becomes larger than necessary and the drilling efficiency decreases, and the lance and nozzle holder There is no damage or wear on the inner wall of the hole.

  In the above invention, the pipe guide (8) includes a first pipe guide (8A) provided on the fixed end (6) side of the guide body (3) to the object. Can do.

  According to this configuration, since the first pipe guide can be fixed to the guide body in advance, the drilling operation can be made efficient. This is particularly effective when a short hole is drilled (when the wall thickness is small).

  In the above invention, the pipe guide (8) may include a second pipe guide (8B) attached to the object.

  According to this configuration, since the guide pipe is held on the distal end side (nozzle holder side) by the second pipe guide, the direction of the hole to be drilled can be made more accurate. In addition, since the distance from the second pipe guide to the swivel holder, that is, the distance between the support points is increased, it is possible to suppress the guide pipe from swinging with the lance when a long hole is formed.

  Moreover, in said invention, it can be set as the structure by which the window (17a) is formed in the said swivel holder side of the said guide pipe.

  If the guide pipe is inserted into the hole drilled in the object, the lance becomes invisible, so the worker notices this when the lance stops rotating due to crushing debris (such as aggregate). Hateful. Thus, with such a configuration, the rotation of the lance can be visually confirmed from the window.

  In the above invention, the swivel (9) is integrated with the swivel holder (10), and is provided so as to be rotatable relative to the fixing member (9a) to which the high-pressure hose is connected, and the fixing member. And the window (17a) is provided at a position corresponding to a connecting portion (9c) between the lance (11) and the swivel member (9b) of the swivel. It can be.

  According to this configuration, when the connection between the lance and the swivel rotating member is loosened, the connecting portion can be retightened with the tool inserted from the window without removing the guide pipe from the swivel holder. Therefore, working efficiency is further improved.

  In the above invention, the guide body may further include support means (60) for supporting a side opposite to a fixed end to the object.

  According to this configuration, since the shake of the guide body due to the rotation of the lance can be reduced, the hole can be drilled in the object more accurately.

  In order to solve the second problem, the present invention is a method of drilling an object (2) using a water jet device (1) having a lance (11), the guide for the object. A step of fixing the body (3) along the direction of drilling (FIG. 7B) and a step of slidably providing the water jet main body (4) with respect to the guide body (FIG. 8D) The first nozzle holder (13A) for small diameter is attached to the tip of the lance, the high-pressure jet having at least an axial component is ejected from the first nozzle holder, and the water jet main body is moved while crushing the object. A step of making a small-diameter hole (41) by advancing along the guide body (FIGS. 8E, 8G, 9I and 9K) and a second nozzle for expanding the diameter Attach the holder (13B) to the tip of the lance A high-pressure jet having at least a radial component is ejected from the second nozzle holder to expand the small-diameter hole (41), and the water-jet main body is advanced along the guide body to increase the large-diameter hole (42). ) Is formed (FIGS. 10 (M), (O), FIG. 11 (Q), (S)).

  According to the method of this configuration, since the large-diameter hole is drilled after the small-diameter hole is first drilled, the position is shifted when the small-diameter hole is struck and hits the embedded object. Even if the small-diameter hole is formed again, the lost work time can be reduced. It is also possible to check the inner wall surface of the small-diameter hole after the small-diameter hole has been drilled, and to shift the center of the large-diameter hole from the center of the small-diameter hole when there is an exposed buried portion. Therefore, it is possible to prevent the work from being lost. That is, a hole having a desired diameter can be efficiently drilled while avoiding an embedded object.

  In the above invention, in the step of drilling the small-diameter hole (41) and the step of drilling the large-diameter hole (42), the small-diameter hole or the After drilling the large-diameter hole partway, replace the lance with a second length longer than the first length to extend the small-diameter hole or the large-diameter hole (FIG. 8F, FIG. 9 (H), (J), FIG. 10 (N), FIG. 11 (P), and (R)) may be performed at least once.

  According to this configuration, since the distance for moving the lance during the drilling operation is shortened, the length of the guide body that slidably supports the water jet main body can be reduced. And since length becomes short, the bending of a guide body becomes small and it can drill a hole with higher precision. Further, since the rigidity required for the guide body is reduced, the guide body can be reduced in size.

  In the above invention, before drilling the small-diameter hole (41), the core drilling device (50) having a diameter equal to or larger than the diameter of the large-diameter hole (42) is used to plan the drilling of the object. A step of drilling a bottomed hole (2a) at a position (FIGS. 7B and 7C), the step of drilling the small-diameter hole and the step of drilling the large-diameter hole; The lance can be directly or indirectly held slidable in the axial direction by the guide means (8B) installed in the bottomed hole.

  According to this configuration, the lance can be supported at two places, that is, the sliding support portion of the water jet main body and the guide means, so that the support accuracy of the lance can be increased and the positional accuracy of the hole can be increased. In particular, the guide means is supported not by the guide body but by the object, and the support point interval becomes long. Therefore, even when a long hole is drilled, the lance can be prevented from swinging around.

  In the above invention, in the step of forming the large-diameter hole, the water jet main body (4) can be slid at a constant speed.

  According to this configuration, the diameter of the large-diameter hole can be made constant.

  As described above, according to the present invention, it is possible to provide a water jet device that has a simple configuration, is unlikely to cause a failure, can secure a desired hole diameter, and has a high drilling efficiency. In addition, according to the present invention, there is provided a drilling method using a water jet device capable of efficiently drilling a hole having a desired diameter while avoiding an embedded object even if the embedded object exists. Can do.

Side view of a water jet device according to an embodiment II-II sectional view in FIG. III-III sectional view in FIG. Longitudinal sectional view of the tip of the guide pipe shown in FIG. (A) Side view (B) Front view (C) Explanatory drawing of usage mode of small diameter nozzle holder shown in FIG. (A) Side view (B) Front view (C) Explanatory drawing of the large diameter nozzle holder shown in FIG. Preparatory work procedure illustration Explanatory drawing of the drilling procedure for small-diameter holes Explanatory drawing of the drilling procedure for small-diameter holes Explanatory drawing of the procedure for drilling large-diameter holes Explanatory drawing of the procedure for drilling large-diameter holes Side view of a water jet device according to a modified embodiment XIII arrow view in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view of the water jet apparatus 1. The water jet device 1 ejects a high-pressure jet to drill an object, and is attached to a side surface of a reinforced concrete body 2 as an object in a state where the drilling direction is substantially horizontal. In the following description, the drilling direction will be described as the front with reference to this posture. The water jet device 1 includes a guide body 3 attached to the reinforced concrete body 2 and a water jet main body 4 attached to the guide body 3 and supported by the guide body 3 as main elements.

  The guide body 3 is fixed to the reinforced concrete body 2 by an anchor bolt 5 and has a rectangular shape 6 in front view, and is erected on the base 6 and extends in a direction perpendicular to the bottom surface of the base 6, that is, the side surface of the reinforced concrete body 2. It has a guide shaft 7 and pipe guides 8 (8A, 8B) which are guide means for holding a guide pipe 15 (to be described later) slidably in the direction of drilling. In this embodiment, the pipe guide 8 is reinforced concrete in a state where the pipe guide 8 is inserted into the first pipe guide 8A attached to the guide shaft 7 so as to be slidable and position-fixable, and the pilot hole 2a formed in the reinforced concrete body 2. Two pipe guides 8B attached to the body 2 are used.

  The base 6 holds the proximal end portion of the guide shaft 7 at the center of the upper end in the left-right direction when attached to the reinforced concrete body 2. The guide shaft 7 is a guide member having a substantially constant cross section having an I-shaped cross section (see FIG. 3), and has a rack 7a in which a plurality of gears are arranged in the drilling direction at a position closer to the rear of the upper surface. doing. In this embodiment, the rack 7a has a length of more than 1 m, and the guide shaft 7 has a length longer than that, and the drilling can be advanced by about 1 m by one drilling operation. As the base 6 and the guide shaft 7, those generally used in the core drill device 50 (FIG. 7B) can be used. The first pipe guide 8A is fixed in front of the position where the rack 7a is provided on the guide shaft 7, and the second pipe guide 8B is fitted and fixed inside the reinforced concrete body 2. Details of the guide shaft 7 will be described later.

  The water jet main body 4 has a swivel holder 10 that is slidably attached to the guide shaft 7 and holds the swivel 9. The swivel 9 is connected to a high-pressure pump (not shown) to which a high-pressure hose for supplying high-pressure drilling water is connected, and a fixed member 9a connected to the fixed member 9a so as to be rotatable relative to the fixed member 9a. It is a joint which has the rotation member 9b which receives supply of drilling water. A nut 9c, which is a fastening member for fixedly connecting a lance 11 described later, is integrally attached to the rotating member 9b of the swivel 9. A pinion gear that meshes with the gear of the rack 7a is rotatably provided inside the swivel holder 10. A handle 10a for operating the rotation is connected to the pinion gear, and the operator can move the swivel holder 10 forward and backward by operating the handle 10a.

  A lance 11 is connected to the rotating member 9b of the swivel 9 through a nut 9c so as not to be relatively rotatable. Inside the lance 11, a flow path 11 a (see FIG. 3) is formed through which high-pressure drilling water supplied from the rotating member 9 b of the swivel 9 flows. The lance 11 is a rotating shaft that supplies the drilling water forward and rotates together with the rotating member 9b to transmit the rotational force. A cylindrical nozzle holder 13 (13A, 13B) having a nozzle 12 for ejecting the supplied drilling water is detachably attached to the tip (front end) of the lance 11. Details of the nozzle holder 13 will be described later.

  On the rear surface side of the swivel holder 10, an electric motor 14 is fixed as a drive source for rotationally driving the rotating member 9 b of the swivel 9. When the electric motor 14 rotates, the rotational force is transmitted to the nozzle holder 13 through the rotating member 9b and the lance 11 of the swivel 9, and the nozzle holder 13 rotates.

  On the other hand, a tubular guide pipe 15 is fixed to the front side of the swivel holder 10 so as to surround the lance 11. The guide pipe 15 has an inner diameter larger than the outer diameter of the lance 11, and is provided integrally with a main body portion 16 having an outer diameter smaller than the outer diameter of the nozzle holder 13, and a base end side of the main body portion 16 and holds a swivel. A cylindrical base 17 that is detachably fixed to the tool 10 and has an inner diameter and an outer diameter larger than the main body 16 and a bearing (at least inside the front end of the main body 16) that holds the lance 11 rotatably. 2). The guide pipe 15 has a length corresponding to the length of the lance 11, specifically, a length in which the front end is located slightly in front of the front end of the lance 11 when attached to the swivel holder 10. Therefore, the nozzle holder 13 is disposed at a position slightly spaced forward from the front end of the guide pipe 15.

  In addition, although mentioned later for details, when drilling the reinforced concrete body 2 which is so thick that it does not penetrate by one drilling, a plurality of guide pipes 15 and lances 11 having different lengths are prepared. That is, the guide pipe 15 and the lance 11 are not added, but one piece having different lengths is prepared. This will slightly increase the manufacturing cost of the device, but it can prevent a decrease in the straightness of the hole due to a decrease in the rigidity of the joint, and also prevent interruption of the work due to the looseness of the joint during drilling work, improving the quality. Improvement of work efficiency is achieved.

  A rotation confirmation window 17 a is formed on the peripheral wall of the base portion 17 of the guide pipe 15. By forming the rotation confirmation window 17a, the operator can visually confirm the rotation of the lance 11 covered with the guide pipe 15. The rotation confirmation window 17a is formed as a long hole in the circumferential direction at a position corresponding to the axial direction and a nut 9c that fastens the rotating member 9b of the swivel 9 and the lance 11. Thereby, it is possible to tighten the nut 9c by inserting a tool from the rotation confirmation window 17a, and even if the fastening between the rotating member 9b and the lance 11 is loosened during the drilling operation, the guide The nut 9 c can be tightened without removing the pipe 15 from the swivel holder 10.

  FIG. 2 shows a longitudinal sectional view of the tip of the guide pipe 15. The main body portion 16 of the guide pipe 15 has a thin portion 16a having an enlarged inner diameter at the tip, and two annular grooves 16b that are separated from each other in the axial direction are formed on the inner surface on the tip side of the thin portion 16a. Yes. Snap rings 19 are fitted in both annular grooves 16b. Two ball bearings 18 described above are installed behind the rear snap ring 19 in the thin portion 16 a, and the axial load of the lance 11 is supported by the guide pipe 15 via both ball bearings 18. A seal member 20 is mounted between the snap rings 19 so as to be sandwiched between them. By disposing the seal member 20 at the tip of the guide pipe 15, it is possible to prevent crushing debris (such as aggregate) due to the water jet from entering the gap between the guide pipe 15 and the lance 11.

  As shown in FIG. 3, the first pipe guide 8 </ b> A includes a slider portion 21 slidably fitted to the guide shaft 7, a height adjusting portion 22 attached to the slider portion 21, and a height adjusting portion 22. It has a holding part 23 attached to the side opposite to the slider part 21. The slider portion 21, the height adjusting portion 22 and the holding portion 23 are integrated together by a long bolt 24 provided in a pair on the left and right. The holding portion 23 is provided with a linear bush 25, and the guide pipe 15 is held by the linear bush 25 so as to be slidable in the drilling direction. That is, the first pipe guide 8A holds the guide pipe 15 to indirectly hold the lance 11 so as to be slidable in the axial direction.

  As shown in FIG. 4, the second pipe guide 8 </ b> B has a contour along the pilot hole 2 a of the reinforced concrete body 2, and a cylindrical outer frame 31 fixed to the reinforced concrete body 2, and an inner surface of the outer frame 31. It has three support columns 32 that are installed at equal intervals and project inward in the radial direction, and a holding portion 33 that is held in the center of the outer frame 31 by the three support columns 32. The holding portion 33 is provided with a linear bush 35, and the guide pipe 15 is held by the linear bush 35 so as to be slidable in the drilling direction. That is, the second pipe guide 8B holds the guide pipe 15 to indirectly hold the lance 11 so as to be slidable in the axial direction. Three spaces formed between the support columns 32 in the annular space between the holding portion 33 and the outer frame 31 function as discharge ports 36 for discharging crushed waste due to the water jet to the outside. The size of the outer frame 31 may be smaller than the large-diameter hole 42 described later, but the lower hole 2a is the same as or larger than the large-diameter hole 42 from the beginning in order to eliminate the trouble of twice opening. It is good to set it as the above magnitude | size.

  Since the nozzle holder 13 has a larger diameter than the guide pipe 15 and cannot pass the linear bush 35, the guide pipe 15 in a state where the nozzle holder 13 is not attached is used as the linear bush 35 of the second pipe guide 8B. After passing, the nozzle holder 13 is attached to the tip of the guide pipe 15 and then the second pipe guide 8B is installed in the prepared hole 2a of the reinforced concrete body 2 so that the water jet device 1 is brought into the state shown in FIG. .

  As described above, when drilling a reinforced concrete body 2 that is so thick that it does not penetrate through a single hole, a plurality of guide pipes 15 and lances 11 having different lengths are prepared. On the other hand, the shape of the nozzle holder mounting portion of the lance 11 is common. Therefore, the nozzle holder 13 may be replaced and used every time the lance 11 having a different length is used. On the other hand, when a hole having a diameter that is so large that it cannot be drilled at one time due to the amount of high-pressure water limited by the rating of the high-pressure pump, the diameter of the high-pressure hose, the diameter of the lance 11, etc. For this, a plurality of different nozzle holders 13 are used. The outline of the nozzle holder 13 will be described with reference to FIGS. 5 and 6.

  FIG. 5 shows a nozzle holder 13 (hereinafter, referred to as a first nozzle holder 13A) that is first used for drilling. (A) is a side view, (B) is a front view, and (C) is a use state. The side view of is shown. As shown to (A) and (B), the lance 11 is connected to the rear surface of the 1st nozzle holder 13A, and the high pressure water channel 13a connected to the flow path 11a of the lance 11 is a front surface inside the 1st nozzle holder 13A. It is formed in the center visually. In the illustrated example, three nozzles 12 (holes) extending from the high-pressure water channel 13a to the outer surface of the first nozzle holder 13A are formed. As a matter of course, the channel cross-sectional area of each nozzle 12 and the total channel cross-sectional area of all the nozzles 12 are smaller than the channel cross-sectional area of the high-pressure water channel 13a.

  One of the three nozzles 12 is formed in parallel with the drilling direction along the axis 11X of the lance 11 and opens at the center of the front surface of the first nozzle holder 13A. The other one is formed with a first inclination angle θ1 with respect to the axis 11X of the lance 11, and opens at a position slightly deviated from the center on the front surface of the first nozzle holder 13A. The last one is formed with a second inclination angle θ2 larger than the first inclination angle θ1 with respect to the axis 11X of the lance 11, and opens at a position more deviated from the center on the front surface of the first nozzle holder 13A. ing.

  Therefore, at the time of drilling, as shown in (C), three water jets are jetted forward or obliquely forward from the front surface of the first nozzle holder 13A along the extending direction of the three nozzles 12 in this state. When the lance 11 and the first nozzle holder 13A rotate and move forward at a constant speed, a relatively small diameter hole (hereinafter referred to as a small diameter hole 41) larger than the diameter of the first nozzle holder 13A is formed. . The water jet is composed only of a liquid that does not contain an abrasive. Therefore, although concrete is crushed, steel materials such as rebars remain as they are without being crushed. The crushed concrete debris (aggregate) is pushed together with the water used for the water jet through the space formed on the outer periphery of the guide pipe 15 to the inlet side of the small-diameter hole 41, and the second pipe of FIG. It is discharged to the outside of the reinforced concrete body 2 through the discharge port 36 of the guide 8B.

  In addition, after installing the 2nd pipe guide 8B in the lower hole 2a, as shown in FIG. 1, the hole which has a larger diameter than the lower hole 2a and penetrates the guide pipe 15 was formed in the circular bottom plate. The water treatment pad 44 is attached to the surface of the reinforced concrete body 2, and the waste water discharged from the lower hole 2a is received by the water treatment pad 44 and simultaneously sucked by the vacuum hose 45 connected to the water treatment pad 44 for simultaneous collection. carry out.

  Although not shown in detail, a similar water treatment pad 46 (see FIG. 8D) is also provided on the surface of the reinforced concrete body 2 on the outlet side of the small-diameter hole 41. However, there is no insertion hole for the guide pipe 15. .) Is attached at the latest before the small-diameter hole 41 penetrates to prevent the water jet from scattering when the small-diameter hole 41 penetrates. The water treatment pad 46 on the outlet side is used not only for preventing the water jet from scattering when penetrating through the small-diameter hole 41 but also for drainage treatment when drilling the large-diameter hole 42 described later.

  FIG. 6 shows a nozzle holder 13 (hereinafter referred to as a second nozzle holder 13B) used after the formation of the small-diameter hole 41. Similarly, (A) is a side view, (B) is a front view, and (C ) Shows a side view of the usage state. As shown to (A) and (B), the lance 11 is connected to the rear surface of the 2nd nozzle holder 13B, and the high pressure water channel 13a connected to the flow path 11a of the lance 11 is the front in the 2nd nozzle holder 13B. It is formed in the center visually. In the illustrated example, three nozzles 12 (holes) extending from the high-pressure water channel 13a to the outer surface of the second nozzle holder 13B are formed.

  One of the three nozzles 12 is formed with a third inclination angle θ3 larger than the second inclination angle θ2 (FIG. 5) with respect to the axis 11X of the lance 11, and the front surface of the second nozzle holder 13B. Open to the outer periphery. The other one is formed with a fourth inclination angle θ4 larger than the third inclination angle θ3 with respect to the axis 11X of the lance 11, and opens near the front outer periphery of the second nozzle holder 13B. The last one is formed with a fifth inclination angle θ5 larger than the fourth inclination angle θ4 with respect to the axis 11X of the lance 11, and opens on the side surface of the second nozzle holder 13B.

  Accordingly, when drilling, as shown in (C), three water jets are jetted obliquely forward or substantially radially from the front or side surface of the second nozzle holder 13B along the extending direction of the three nozzles 12. In this state, the lance 11 and the second nozzle holder 13B advance at a constant speed while rotating, so that a hole having a larger diameter than the small hole 41 (hereinafter referred to as a large hole 42) is formed. In other words, the small-diameter hole 41 is expanded to the large-diameter hole 42.

  Even when the large-diameter hole 42 is drilled, since the water jet does not include the abrasive, only the concrete is crushed and the steel material such as the reinforcing bar is not crushed. The crushed concrete litter (aggregate) is pushed to the entrance side of the large-diameter hole 42 through the space formed on the outer periphery of the guide pipe 15 together with the water used for the water jet, or the small-diameter hole in the front. 41 is pushed to the outlet side of the small-diameter hole 41. The wastewater containing the crushed waste that has been swept away is received by the water treatment pads 44 and 46 and simultaneously sucked by the vacuum hose 45 and simultaneously collected.

  When drilling a larger diameter hole, the advance speed of the second nozzle holder 13B is slowed or omitted, but for example, a nozzle holder 13 in which only a plurality of nozzles 12 having a fifth inclination angle are formed is used. Then, the diameter may be expanded again.

  As described above, the water jet device 1 according to the embodiment includes the guide body 3, the swivel holder 10, the lance 11, the nozzle holder 13, the electric motor 14, the guide pipe 15, and the pipe guide 8. Accordingly, the water jet ejected from the nozzle 12 while the electric motor 14 rotationally drives the lance 11 crushes the object into a circular cross section, and the swivel holder 10 slides along the guide body 3, thereby A hole having a desired diameter can be drilled in an object.

  Since the lance 11 is surrounded by the guide pipe 15 and the lance 11 is rotated inside the guide pipe 15 by the electric motor 14, a failure is unlikely to occur. In addition, even when the drilling length is long, the rotating lance 11 is held by the guide pipe 15 so that it does not sway, and the hole diameter becomes larger than necessary, so that the drilling efficiency is reduced. The nozzle holder 13 does not come into contact with the inner wall surface of the hole and is not damaged or worn.

  In the present embodiment, the pipe guide 8 includes a first pipe guide 8A provided on the base 6 side for fixing the guide body 3 to the reinforced concrete body 2. Therefore, the first pipe guide 8A can be fixed to the guide body 3 in advance, and the efficiency of drilling work can be improved. This is particularly effective when a short hole is drilled (when the wall thickness is small).

  Moreover, in this embodiment, the pipe guide 8 contains the 2nd pipe guide 8B attached to the reinforced concrete body 2. FIG. Therefore, since the guide pipe 15 is held on the tip side (nozzle holder 13 side) by the second pipe guide 8B, the direction of the hole to be drilled becomes more accurate. Further, since the distance from the second pipe guide 8B to the swivel holder 10, that is, the distance between the support points, is increased, the guide pipe 15 is prevented from swinging with the lance 11 when the length is drilled.

  If the guide pipe 15 is inserted into the hole drilled in the object, the lance 11 becomes invisible, so that when the crushing waste (such as aggregate) is caught and the rotation of the lance 11 stops, Although it is difficult to notice this, as described above, the rotation confirmation window 17a is formed in the base 17 of the guide pipe 15 on the swivel holder 10 side, so that the rotation of the lance 11 can be easily confirmed visually from the rotation confirmation window 17a. can do.

  Further, the swivel 9 is integrated with the swivel holder 10 and has a fixing member 9a to which a hose is connected, and a rotating member 9b provided so as to be rotatable relative to the fixing member 9a, and a rotation confirmation window 17a. Is provided at a position corresponding to the nut 9c for connecting the lance 11 and the rotating member 9b of the swivel 9 to each other. Therefore, when the connection between the lance 11 and the rotating member 9b of the swivel 9 is loosened, the nut 9c can be retightened with a tool inserted from the window without removing the guide pipe 15 from the swivel holder 10. Is further improved.

  Next, a procedure for drilling the reinforced concrete body 2 using the water jet device 1 according to the embodiment (perforating the large-diameter hole 42) will be described with reference to FIGS.

  First, the procedure of the preparation work will be described with reference to FIG. Here, as shown in (A), the reinforced concrete body 2 is a bridge pier having a thickness of about 4 m, and in order to add a PC steel wire for seismic reinforcement, a large-diameter hole 42 of about 4 m shown by an imaginary line. (Through hole) is formed. First, as shown in (B), the guide body 3 of the water jet device 1 is fixed to one side surface of the reinforced concrete body 2 where the large-diameter hole 42 is planned to be drilled, and a known core drill device 50 is attached to the guide body 3. Set. The core drill device 50 is driven to rotate the core bit, and the handle 50a is operated to an extent that the rotation speed of the core drill does not become extremely low to apply a forward force to the core drill device 50 to form the core hole. Thereafter, as shown in (C), the core drill device 50 is removed, and the core is taken out by a known method using a wedge or a thread to form the bottomed prepared hole 2a. The diameter of the lower hole 2a is preferably equal to or larger than the diameter of the large-diameter hole 42 as described above.

  Next, a procedure for drilling the small-diameter hole 41 will be described with reference to FIGS.

  First, as shown in FIG. 8D, the first pipe guide 8A is attached to the guide body 3, and the first lance 11A and the first guide pipe 15A each having a length of about 1 m are attached to the water jet main body 4. set. After inserting the first guide pipe 15A of the water jet main body 4 into the second pipe guide 8B, the first nozzle holder 13A for small diameter is attached to the tip of the first lance 11A, and the second pipe guide 8B is inserted into the lower hole 2a. The water jet main body 4 is attached to the guide body 3 while being inserted and fixed to the reinforced concrete body 2. Further, a water treatment pad 44 and a vacuum hose 45 are set on the surface of the reinforced concrete body 2 on the inlet side of the small diameter hole 41. The water treatment pad 46 and the vacuum hose 45 are also set on the exit side surface of the small-diameter hole 41 in the reinforced concrete body 2.

  Subsequently, as shown in (E), the electric motor 14 is driven to rotate the first lance 11A and the first nozzle holder 13A, and a water jet mainly having an axial component is ejected, so that the concrete of the reinforced concrete body 2 is made. While crushing, the water jet main body 4 is advanced at a constant speed, and a small-diameter hole 41 is formed by about 1 m. During the drilling, both the crushed concrete waste and the water used for the water jet are washed away to the inlet side of the small-diameter hole 41 and are received by the water treatment pad 44 and discharged by the vacuum hose 45. Thereafter, the fixing of the second pipe guide 8B to the reinforced concrete body 2 is released, the water jet main body 4 is retracted, the first nozzle holder 13A is once removed, and the first lance 11A and the first guide pipe 15A are removed from the water jet main body 4. Remove.

  Subsequently, as shown in (F), the second lance 11 </ b> B and the second guide pipe 15 </ b> B each having a length of about 2 m are set on the water jet main body 4. In other words, lance replacement is performed to replace the lance 11 with a longer one. After inserting the second guide pipe 15B of the water jet main body 4 into the second pipe guide 8B, the first nozzle holder 13A is attached to the tip of the second lance 11B, and the second pipe guide 8B is inserted into the pilot hole 2a to reinforce the concrete. The water jet main body 4 is attached to the guide body 3 while being fixed to the body 2.

  Subsequently, as shown in (G), the electric motor 14 is driven to rotate the second lance 11B and the first nozzle holder 13A, and a water jet mainly having an axial direction component is ejected, so that the concrete of the reinforced concrete body 2 is made. While crushing, the water jet main body 4 is advanced at a constant speed, and the small-diameter hole 41 is further drilled by about 1 m so as to be about 2 m. Thereafter, the first nozzle holder 13 </ b> A is once removed and the second lance 11 </ b> B and the second guide pipe 15 </ b> B are removed from the water jet main body 4 in the manner described in (E).

  Subsequently, as shown in FIG. 9 (H), in the same manner as (F), the third lance 11C and the third guide pipe 15C each having a length of about 3 m or more are set on the water jet main body 4, and the third After inserting the guide pipe 15C into the second pipe guide 8B, the first nozzle holder 13A is attached to the tip of the third lance 11C, the second pipe guide 8B is attached to the lower hole 2a, and the water jet main body 4 is attached to the guide body 3. set.

  Subsequently, as shown in (I), the electric motor 14 is driven to rotate the third lance 11C and the first nozzle holder 13A, and a water jet mainly having an axial component is ejected, so that the concrete of the reinforced concrete body 2 is made. While crushing, the water jet main body 4 is advanced at a single speed, and the small-diameter hole 41 is further drilled by about 1 m to about 3 m. Thereafter, the first nozzle holder 13A is once removed and the third lance 11C and the third guide pipe 15C are removed from the water jet body 4 in the manner described in (E).

  Subsequently, as shown in (J), in the same manner as (F), the fourth lance 11D and the fourth guide pipe 15D each having a length of about 4 m or more are set on the water jet main body 4, and the fourth guide pipe After inserting 15D into the second pipe guide 8B, the first nozzle holder 13A is attached to the tip of the fourth lance 11D, the second pipe guide 8B is set in the lower hole 2a, and the water jet main body 4 is set in the guide body 3. .

  Subsequently, as shown in (K), the electric motor 14 is driven to rotate the fourth lance 11D and the first nozzle holder 13A, and a water jet mainly having an axial component is ejected, so that the concrete of the reinforced concrete body 2 is made. While crushing, the water jet main body 4 is advanced at a single speed, and the small-diameter hole 41 is further drilled by about 1 m to penetrate the reinforced concrete body 2. At the time of penetration, a water jet ejected from the first nozzle holder 13A is received by the water treatment pad 46 to prevent scattering. After the penetration, the first nozzle holder 13A, the fourth lance 11D, and the fourth guide pipe 15D are removed from the water jet main body 4.

  When the small-diameter hole 41 hits an embedded object such as a reinforcing bar, the first nozzle holder 13A comes into contact with the water jet main body 4 so that the water jet main body 4 cannot move forward. The inside of the small-diameter hole 41 is confirmed. If the obstacle is a rebar that is not allowed to be cut, shift the position and start over. Further, even when the first nozzle holder 13A has advanced without colliding with an obstacle, the inner wall surface is inspected after the small-diameter hole 41 is penetrated. When a reinforcing bar that is not allowed to be cut is exposed, the position of the large-diameter hole 42 to be described below may be appropriately shifted, that is, the fixing position of the guide body 3 may be shifted.

  Next, a procedure for drilling the large-diameter hole 42 will be described with reference to FIGS. Here, the description will be made assuming that the drilling position of the large-diameter hole 42 is not shifted from the position of the small-diameter hole 41.

  First, as shown in (L) of FIG. 10, the first lance 11 </ b> A and the first guide pipe 15 </ b> A each having a length of about 1 m are set on the water jet main body 4 again. After the first guide pipe 15A of the water jet main body 4 is inserted into the second pipe guide 8B, the second nozzle holder 13B is now attached to the tip of the first lance 11A, and the second pipe guide 8B is inserted into the lower hole 2a. The water jet main body 4 is attached to the guide body 3 while being fixed to the reinforced concrete body 2. In the reinforced concrete body 2, the water treatment pad 44 and the vacuum hose 45 are set on the inlet side surface of the large diameter hole 42, and the water treatment pad 46 and the vacuum hose 45 are set on the outlet side surface of the large diameter hole 42. This is the same as when the small-diameter hole 41 described in FIG. 8 is drilled.

  Subsequently, as shown in (M), the electric motor 14 is driven to rotate the first lance 11A and the second nozzle holder 13B, and the water jet mainly having the radial direction component is ejected, so that the concrete of the reinforced concrete body 2 is made. The water jet main body 4 is advanced at a constant speed while being crushed, and a large-diameter hole 42 is formed by about 1 m. During the drilling, both the crushed concrete waste and the water used for the water jet are washed away to the inlet side of the small-diameter hole 41 and are received by the water treatment pad 44 and discharged by the vacuum hose 45. Moreover, since the water used for the concrete scrap and the water jet also flows out to the outlet side of the small-diameter hole 41 in the reinforced concrete body 2, the vacuum hose 45 of the water treatment pad 46 attached to the outlet side surface is also operated. Keep it. Thereafter, the fixing of the second pipe guide 8B to the reinforced concrete body 2 is released, the water jet main body 4 is retracted, the second nozzle holder 13B is once removed, and the first lance 11A and the first guide pipe 15A are removed from the water jet main body 4. Remove.

  Subsequently, as shown in (N), the second lance 11 </ b> B and the second guide pipe 15 </ b> B each having a length of about 2 m are set on the water jet main body 4. In other words, lance replacement is performed to replace the lance 11 with a longer one. After inserting the second guide pipe 15B of the water jet body 4 into the second pipe guide 8B, the second nozzle holder 13B is attached to the tip of the second lance 11B, and the second pipe guide 8B is inserted into the pilot hole 2a to reinforce the concrete. The water jet main body 4 is attached to the guide body 3 while being fixed to the body 2.

  Subsequently, as shown in (O), the electric motor 14 is driven to rotate the second lance 11B and the second nozzle holder 13B, and a water jet mainly having a radial component is ejected to make the concrete of the reinforced concrete body 2 The water jet main body 4 is advanced at a constant speed while crushing, and the large-diameter hole 42 is further drilled by about 1 m so as to be about 2 m. Thereafter, the second nozzle holder 13B is once removed and the second lance 11B and the second guide pipe 15B are removed from the water jet body 4 in the manner described in (M).

  Subsequently, as shown in FIG. 11 (P), the third lance 11C and the third guide pipe 15C each having a length of about 3 m are set on the water jet main body 4 in the same manner as (N). After the third guide pipe 15C of the water jet body 4 is inserted into the second pipe guide 8B, the second nozzle holder 13B is attached to the tip of the third lance 11C, and the second pipe guide 8B is inserted into the lower hole 2a. 4 is set on each guide body 3.

  Subsequently, as shown in (Q), the electric motor 14 is driven to rotate the third lance 11C and the second nozzle holder 13B, and the water jet mainly having a radial direction component is ejected, so that the concrete of the reinforced concrete body 2 is made. While crushing, the water jet main body 4 is advanced at a single speed, and the large-diameter hole 42 is further drilled by about 1 m to about 3 m. Thereafter, the second nozzle holder 13B is once removed and the third lance 11C and the third guide pipe 15C are removed from the water jet main body 4 as described in (M).

  Subsequently, as shown in (R), the fourth lance 11D and the fourth guide pipe 15D each having a length of about 4 m or more are set in the water jet main body 4 in the same manner as (N). After the fourth guide pipe 15D of the water jet main body 4 is inserted into the second pipe guide 8B, the second nozzle holder 13B is attached to the tip of the fourth lance 11D, and the second pipe guide 8B is inserted into the lower hole 2a. 4 is set on each guide body 3.

  Subsequently, as shown in (S), the electric motor 14 is driven to rotate the fourth lance 11D and the second nozzle holder 13B, and a water jet mainly having a radial direction component is ejected, so that the concrete of the reinforced concrete body 2 is made. The water jet main body 4 is advanced at one speed while being crushed, and the large-diameter hole 42 is further drilled by about 1 m to penetrate the reinforced concrete body 2, and the drilling of the large-diameter hole 42 is completed.

  In this way, after the small-diameter hole 41 is first drilled (FIGS. 8 and 9), the large-diameter hole 42 is formed while the small-diameter hole 41 is expanded using the second nozzle holder 13B for expanding the diameter. (FIGS. 10 and 11), when the small-diameter hole 41 is pierced with an embedded object when the small-diameter hole 41 is pierced, even if the small-diameter hole 41 is pierced again by shifting the position, Less work time. Further, after the drilling of the small-diameter hole 41 is completed, the inner wall surface of the small-diameter hole 41 is confirmed, and when there is an exposed embedded portion, the center of the large-diameter hole 42 is shifted from the center of the small-diameter hole 41. It is possible to prevent the work from being lost. That is, a hole having a desired diameter can be efficiently drilled while avoiding an embedded object.

  Further, when the small-diameter hole 41 is drilled (FIGS. 8 and 9) and when the large-diameter hole 42 is drilled (FIGS. 10 and 11), the small lance 11 is used first. After drilling the bore 41 or the large bore 42 to the middle, the lance 11 is replaced with a longer lance 11 and the lance exchange for extending the small bore 41 or the large bore 42 is performed at least once. Further, the distance for moving the lance 11 is shortened, and the length of the guide body 3 that slidably supports the water jet main body 4 can be shortened. And since length becomes short, the bending of the guide body 3 becomes small and it becomes possible to drill a hole with higher precision. Further, since the rigidity required for the guide body 3 is reduced, the guide body 3 can be downsized.

  In this embodiment, before drilling the small-diameter hole 41, the bottomed bottom hole 2 a is formed at the planned drilling position of the reinforced concrete body 2 using the core drill device 50 having a diameter equal to or larger than the diameter of the large-diameter hole 42. (FIGS. 7B and 7C), when drilling the small-diameter hole 41 (FIGS. 8 and 9) and when drilling the large-diameter hole 42 (FIGS. 10 and 11) The lance 11 is indirectly held slidable in the axial direction by the second pipe guide 8B installed in the lower hole 2a. Therefore, the lance 11 is supported at two locations of the swivel holder 10 which is a sliding support portion of the water jet main body 4 and the second pipe guide 8B, and the support rigidity is increased, and the positions of the holes (41, 42) are increased. Accuracy is also increased. In particular, since the second pipe guide 8B is supported not by the guide body 3 but by the reinforced concrete body 2, and the support point interval becomes long, the lance 11 can be prevented from swinging even when long holes (41, 42) are drilled. Is done.

  In addition, when the large-diameter hole 42 is formed (FIGS. 10 and 11), the diameter of the large-diameter hole 42 can be made constant by sliding the water jet main body 4 at a constant speed. . In this embodiment, the operator operates the handle 10a to advance the water jet main body 4 at a constant speed. However, it is preferable to provide a forward drive device that advances the swivel holder 10 at a predetermined speed. The water jet main body 4 may be advanced at a constant speed.

<Modified Embodiment>
Next, with reference to FIG. 12 and FIG. 13, the water jet apparatus 1 which concerns on the deformation | transformation embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the member and site | part same as the said embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 12, the water jet device 1 according to the present modified embodiment includes a support frame 60 that supports the rear portion (the side opposite to the base 6) of the guide shaft 7 in addition to the configuration of the above embodiment. . The support base 60 is not limited to a specific configuration as long as it can support a load in the direction orthogonal to the drilling direction of the rear portion of the guide shaft 7 (particularly the vertical load in the present modified embodiment). . In the present modified embodiment, the support pedestal 60 is a temporary scaffold that is installed by assembling a single pipe on a support surface 61 (such as the ground or the upward surface of the reinforced concrete body 2) below the drilling position of the reinforced concrete body 2. Is used.

  Specifically, the support frame 60 is erected so as to surround the water jet main body 4 attached to the guide body 3, and includes four support columns 62 including a jack 62 a for height adjustment at the lower end and four support columns 62. The upper and lower horizontal connecting members 63 arranged in a rectangular shape so as to connect the upper and lower portions of the support post 62, the scaffolding plate 64 installed on the lower horizontal connecting member 63, and the two rear support posts 62 And a support single tube 65 that supports the rear end of the guide shaft 7 and a clamp 66 fixed to the support single tube 65. As shown in FIG. 13, an angle 7b is attached to the rear end of the guide shaft 7 so as to extend in the vertical direction, and the clamp 66 grips one side of the angle 7b to guide the guide shaft. The rear end of 7 is fixed.

  As described above, the water jet device 1 further includes the support frame 60 as a support means for supporting the side of the guide body 3 opposite to the fixed end to the reinforced concrete body 2, whereby the rear portion of the guide body 3 due to the rotation of the lance 11. Since the fluctuation can be reduced, the small-diameter hole 41 and the large-diameter hole 42 can be drilled in the reinforced concrete body 2 more accurately.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above-described embodiment, the reinforced concrete body 2 has been described as an object to be drilled as an example, but the object is not limited to this and can be widely applied. In the modified embodiment, the support frame 60 using a temporary scaffold is used as the support means for supporting the rear part of the guide body 3. For example, four chain blocks locked to the rear part of the guide body 3 are used. Thus, it is possible to apply a tensile force in the vertical and horizontal directions to fix the rear portion of the guide body 3. In addition, the specific configuration and arrangement of each member and part, the quantity, the angle, the procedure of each operation, and the like can be changed as appropriate without departing from the spirit of the present invention. On the other hand, all the components and procedures shown in the above embodiment are not necessarily essential, and can be selected as appropriate.

1 Water jet device 2 Reinforced concrete body (object)
2a Pilot hole (bottomed hole)
3 Guide body 4 Water jet body 6 Base (fixed end)
7 Guide shaft 8 Pipe guide 8A First pipe guide 8B Second pipe guide (guide means)
9 Swivel 9a Fixing member 9b Rotating member 9c Nut (connection part)
DESCRIPTION OF SYMBOLS 10 Swivel holder 11 Lance 11a Flow path 12 Nozzle 13 Nozzle holder 13A 1st nozzle holder 13B 2nd nozzle holder 14 Electric motor (drive source)
15 Guide pipe 17a Rotation confirmation window (window)
41 Small-diameter hole 42 Large-diameter hole 50 Core drill device 60 Support frame (support means)

The present disclosure relates to a water jet apparatus that injects a high-pressure jet to drill an object and a drilling method using the water jet apparatus, and is a technique that is particularly suitable when the drilling length is long or the drilling diameter is large. .

Claims (10)

A water jet device that injects a high-pressure jet to drill an object,
A guide body fixed to the object so as to follow the drilling direction;
A swivel holder provided slidably on the guide body and holding a swivel;
A lance that is connected to the swivel and has a channel formed therein for circulating the liquid supplied from the swivel.
A nozzle holder provided at the tip of the lance and having a nozzle for ejecting the liquid;
A drive source fixed to the swivel holder and driving the lance to rotate;
A guide pipe fixed to the swivel holder so as to surround the lance and holding the lance rotatably;
A water jet device comprising: a pipe guide for holding the guide pipe slidably in an axial direction.   The water jet device according to claim 1, wherein the pipe guide includes a first pipe guide provided on a fixed end side of the guide body to the object.   The water jet device according to claim 1, wherein the pipe guide includes a second pipe guide attached to the object.   The water jet device according to any one of claims 1 to 3, wherein a window is formed on the swivel holder side of the guide pipe. The swivel is integrated with the swivel holder, and includes a fixing member to which a high pressure hose is connected, and a rotating member provided to be rotatable relative to the fixing member.
The water jet device according to claim 4, wherein the window is provided at a position corresponding to a connecting portion between the lance and the rotating member of the swivel.   The water jet device according to any one of claims 1 to 5, further comprising support means for supporting a side of the guide body opposite to a fixed end to the object. A method of drilling an object using a water jet device having a lance,
Fixing the guide body along the drilling direction to the object; and
Providing a water jet body slidably with respect to the guide body;
A first nozzle holder for a small diameter is attached to the tip of the lance, and a high-pressure jet flow having at least an axial component is ejected from the first nozzle holder to break the object along the water jet main body along the guide body. Advancing and drilling a small bore,
A second nozzle holder for expanding the diameter is attached to the tip of the lance, and a high pressure jet having at least a radial component is ejected from the second nozzle holder to expand the small-diameter hole and guide the water jet main body to the guide. A drilling method using a water jet device, the method comprising: advancing along the body to form a large-diameter hole.   In the step of drilling the small-diameter hole and the step of drilling the large-diameter hole, the first hole is partially drilled using the lance having the first length, and then the first The water jet device according to claim 7, wherein the lance replacement is performed at least once by replacing the lance with a second length longer than the lance length and extending the small diameter hole or the large diameter hole. The drilling method used. Before drilling the small-diameter hole, further comprising the step of drilling a bottomed hole at the planned drilling position of the object using a core drill device having a diameter equal to or larger than the diameter of the large-diameter hole;
In the step of drilling the small-diameter hole and the step of drilling the large-diameter hole, the lance is directly or indirectly held slidable in the axial direction by guide means installed in the bottomed hole. A hole drilling method using the water jet device according to claim 7 or 8.   The step using the water jet device according to any one of claims 7 to 9, wherein in the step of forming the large-diameter hole, the water jet main body is slid at a constant speed. Hole method.

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