JP2004009703A - Method for boring continuous straight hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for boring a hole which eliminates a bend part and can accurately bore the hole in the direction of extending the continuous straight hole when the bend part is appeared in the hole while the continuous straight hole is bored in a reinforced concrete structure. <P>SOLUTION: In boring the continuous straight hole 1 in the reinforced concrete structure A with a boring rod 11, when the bend part 1a is appeared on the bored hole due to the presence of a reinforcing steel a, after enlarging the bend part 1a by pulling out the boring rod 11 and inserting a bit 22 for enlarging the hole, a hardening material C is filled in the enlarged bored hole part B and is hardened, and then again the boring rod 11 is inserted in the existing continuous straight hole 1 and the hole which is straightly communicated with the continuous straight hole 1 is bored in the hardening material C. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously drilling a straight hole in an object to be drilled such as a reinforced concrete structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when piping and the like are passed through an existing reinforced concrete structure, a continuous straight hole for inserting piping and the like is previously drilled through the reinforced concrete structure using a boring machine. ing.
[0003]
A boring machine drills an object to be drilled by rotating a rod having a bit attached to its tip while applying a propulsive force in the axial direction. If there is a difference in strength in the part to be pierced, for example, when the object to be pierced is a reinforced concrete structure, and when piercing the reinforced burial part or when the hard layer part and the soft layer coexist, or In the case where a crack is generated, the bit mounted on the tip of the rod being propelled while rotating may be punctured while bending toward the weaker strength.
[0004]
As described above, if a bent portion occurs partially during the formation of the continuous straight hole, the work of inserting the pipes or the like into the hole after the formation of the hole cannot be performed. For this reason, for example, as described in Japanese Patent Application Laid-Open No. 2000-140576, when a hole is bent when an object to be drilled is drilled by a boring machine, a cylinder is formed in the tip of the hollow rod of the boring machine. It is performed to correct the bent portion to a straight hole while changing the weight and the rolling direction of the weight of the weight by using a bending corrector that accommodates the weight of the shape so that it can roll freely in the circumferential direction. I have.
[0005]
[Problems to be solved by the invention]
However, in such a method for correcting a bent portion of a hole, since the tip of the rod is cut against the hole wall in a direction opposite to the bending direction of the hole, the hole wall is cut. It is extremely difficult, and the bend is not sufficiently corrected, or the bend is corrected more than necessary, causing a bend in the opposite direction, so that the existing straight hole cannot be accurately drilled in the straight line direction. There was a point.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to form a continuous straight hole in an object to be drilled such as a reinforced concrete structure or a bedrock. The present invention provides a method of drilling a continuous straight hole that can be formed into a straight hole that is accurately continuous in the direction in which the straight hole that has already been drilled is extended when the bend occurs. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a method of drilling a continuous straight hole according to the present invention is a method of drilling a hole in an object to be drilled in a continuous straight line, as described in claim 1, wherein In the case where a bend occurs in the hole formed by the above, after detecting the bent portion, the bent portion is enlarged and pierced, and the expanded material is filled with a hardening material, and after the hardened material is hardened, the hardening material is cured by the above-described drilling device. It is characterized in that a hole is drilled straight in the direction of extending the existing continuous straight hole in the material.
[0008]
Further, the invention according to claim 2 is characterized in that when a hole is continuously drilled in a reinforced concrete structure by a drilling device, when the presence of an embedded reinforcing bar is detected on the continuous straight hole to be drilled, Enlarging and piercing the buried portion, filling the enlarged perforated portion with a hardening material, and after hardening the hardening material, directly drilling a hole in a direction in which the existing continuous straight hole is extended in the hardened material by the above-described punching device. It is characterized.
[0009]
[Action]
A hole having a predetermined diameter is drilled in a continuous straight line in a drilling target object by a drilling machine having a cutting bit provided at the tip of a rod. If the hole is bent during the drilling of the hole, the bent portion is detected by the detecting means provided in the drilling device, and the rod of the drilling device is once removed from the hole. Thereafter, a drill bit is attached to the tip of the rod of the drilling device or the tip of another rod, and this rod is inserted into the bent portion through the hole, and the circumference of the bent portion is expanded by the drill bit, excavated and enlarged. Form a perforation.
[0010]
Next, the enlarged drilling portion is filled with a hardening material having a strength capable of being drilled by the drilling bit of the drilling device. After the hardening material is hardened, the rod of the drilling device is inserted into the hole again and propelled while rotating. By doing so, a straight hole is drilled in the hardened material by the cutting bit at the tip thereof in a direction to extend the existing continuous straight hole into which the rod of the drilling device is inserted up to the hardened material. In addition, the detection of the bent portion of the hole drilled by the drilling device may be performed after a hole of a predetermined length is drilled by the drilling device, or may be detected after the hole is drilled to the end. After detecting the bent portion, excavation of the enlarged perforated portion of the bent portion by the perforation bit, filling of the enlarged perforated portion with a hardening material, and perforation after hardening may be performed.
[0011]
Further, in the case where the object to be drilled is a reinforced concrete structure, if the reinforcing bar buried in the reinforced concrete structure exists on the planned drilling line, the reinforcing bar is cut by the cutting bit at the tip of the drilling device. Since the cutting resistance is higher at the part side than at the concrete part side, a situation occurs in which the cutting bit pierces while bending toward the concrete part side. In this case, as described above, after forming the bent portion of the hole while cutting the reinforcing bar with a cutting bit, the bent portion may be expanded and excavated, but a continuous straight hole may be formed in the reinforced concrete structure. While the cutting bit reached the reinforcing bar existing portion, the presence of this reinforcing bar was detected and the enlarged drilling portion was excavated by the hole expanding bit before drilling the bent portion. After the material is filled and cured, a straight hole communicating with the existing continuous straight hole may be formed in the cured material.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which an object to be drilled is a reinforced concrete structure A, and a straight hole having a predetermined diameter, that is, a continuous straight hole 1 is drilled in the reinforced concrete structure A by using a drilling device 10. Is shown. The above-mentioned perforating device 10 has a rod 11 called a core tube which has a fixed diameter and a constant diameter and can be formed long by being sequentially connected, and is detachably attached to a distal end portion of the rod 11 on the most distal side. Cutting bit 12, a swivel joint 13 for grasping the base end of the last rod 11, a hydraulic motor 14 for rotating and driving the rod 11 via the swivel joint 13, and a propulsion for propelling the rod 11. It comprises a mechanism 15, a rod guide 16 and a rod clamp 17.
[0013]
The hydraulic motor 14 is integrally attached to the back surface of the swivel joint 13, and the swivel joint 14 is fixed on a movable table 18 that is moved by a propulsion mechanism 15 in the front-rear direction (the length direction of the rod). The moving table 18 is disposed on a rail 20 laid horizontally in the front-rear direction on a fixed machine table 19 of the drilling device 10 so as to be movable back and forth. A feed chain 15c is bridged between the front and rear sprockets 15a and 15b rotatably supported by the shaft, and the feed chain 15c is connected to the moving table 18 so that the moving table 18 is moved back and forth by a hydraulic cylinder 15d. ing.
[0014]
The rod guide 16 and the rod clamp 17 are erected at the front end (front end) of the fixing machine base 19 with the rod clamp 17 on the front side, and the rod 11 gripped by the swivel joint 13 is pivoted on its axis. The rod guide 16 is supported so as to be movable back and forth on the line, and the rod 11 is clamped by the rod clamp 17 when the rod 11 is connected.
[0015]
In order to use the drilling device 10 configured as described above to drill the continuous straight hole 1 penetrating the reinforced concrete structure A at a predetermined location on the front and rear surfaces, first, the fixing machine base 19 of the drilling device 10 is attached to the reinforced concrete structure. A is installed and fixed in the vicinity of one surface (rear surface in the figure) of the A, and then the hydraulic motor 14 is driven to rotate the rod 11 whose base end is gripped by the swivel joint 13 and to drive the propulsion mechanism 15. When the moving table 18 is gradually moved forward by operating the hydraulic cylinder 15a, the cutting bit 12 attached to the tip of the rod 11 inserted and supported by the rod guide 16 is moved to the reinforced concrete structure A. After contact with the wall surface of the reinforced concrete structure A, a hole 1 having a constant diameter is formed in the reinforced concrete structure A by the rotation force of the rod 11 and the propulsion force in the axial direction. Drill in a shape.
[0016]
When a continuous straight hole 1 having a length substantially equivalent to the length of one rod 11 is drilled, the swivel joint 13 releases the gripping of the rod 11, and the base end of the rod 11 is moved to the rod. After being fixed by the clamp 17 and retreating the moving table 18 by the propulsion mechanism 15, the distal end of the next fixed length rod 11 is connected to the proximal end of the rod 11, and the proximal end of the rod 11 is connected to the swivel joint. 13, the rod 11 is propelled while rotating the rod 11 in the same manner as described above, thereby drilling the continuous straight hole 1.
[0017]
As described above, the horizontal continuous straight hole 1 penetrating between the front and rear walls of the reinforced concrete structure A is formed by successively adding the fixed-length rods 11. When the length is large, horizontal continuous straight holes 1 and 1 are drilled from the front and rear wall surfaces by a drilling device 10, and these continuous straight holes 1 and 1 are formed in the middle part of the reinforced concrete structure A. What is necessary is just to communicate on the same straight line. Further, since the rod 11 is a core tube, and the reinforced concrete structure portion cut by the cutting bit 12 becomes cylindrical and is taken into the rod 11, when drilling the long continuous straight hole 1, Each time a hole 1 having a length corresponding to the length of the rod 11 is pierced, once the rod 11 is withdrawn from the continuous straight hole 1 over the entire length from the continuous straight hole 1 to the rod 11 at the forefront end, and the connection of the rod 11 is released. A method in which a columnar concrete mass taken in the rod 11 at the forefront end is removed, and the rods 11 are again inserted into the continuous straight hole 1 while sequentially connecting the rods, thereby forming the continuous straight hole 1. It is.
[0018]
During the drilling of the continuous straight hole 1 by the drilling device 10, when there is a difference in strength in the portion of the reinforced concrete structure A to be drilled, for example, as shown in FIG. When the rebar buried portion is cut by the cutting bit 12 attached to the tip of the rod 11, the cutting bit 12 is deflected in a direction to escape from the reinforcing bar a, and the tip of the rod 11 is moved toward the weakened portion. Punching is performed while bending, and a bending portion 1a is generated in the continuous straight hole 1 that has been drilled in a horizontal straight line.
[0019]
The detection of the bent portion 1a is performed by detecting a piercing state such as a rotational torque and a thrust of the rod 11 by a detecting means such as a load cell, or by detecting the center position of a target mounted on the tip of the rod through the hollow interior of the rod. Can be detected by measuring
[0020]
When such a bent portion 1a is detected, the moving table 10 of the drilling device 10 is retracted, the rod 11 is pulled out from the hole 1 in which the hole has already been drilled, that is, the existing continuous straight hole 1, and the cutting bit 12 is attached to the tip. As shown in FIG. 3, instead of the foremost rod 11 mounted, a hollow rod 21 having a hole-expanding bit 22 mounted on its distal end is connected. The hollow rod 21 is formed to have the same outer diameter and the same length as the rod 11, and has an expansion / contraction mechanism for expanding / contracting the hole expansion bit 22 in the distal end thereof. The hole-expanding bit 22 is mounted on the distal end of a segment 23 which is formed by dividing the distal end of the hollow rod 21 in the circumferential direction and which can be expanded and contracted in the inward and outward directions. ) Is formed on the tapered surface 24 whose diameter gradually decreases.
[0021]
The expanding / contracting mechanism for expanding / contracting the hole expanding bit 22 includes a distal end portion of a hollow rod 21 formed in a cylinder portion 25, and a distal end of a rod 27 of a piston 26 disposed slidably back and forth in the cylinder portion 25. A frustoconical wedge member 28 whose surface is formed in a tapered surface pressed against the tapered surface 24 of all the divided pieces 23 is integrally fixed, and this wedge member 28 is press-fitted into the cylinder portion 25 in a normal state. The split piece 23 is retracted by the resilience of the spring 29 to reduce the diameter of the split piece 23 to the diameter equal to the outer diameter of the hollow rod 21 by the elastic restoring force of the split piece 23 itself. By injecting pressurized water into the hollow rod 21 through the hollow interior of the rod 11 being held, the back pressure of the piston 26 is pressed by the water pressure to advance the wedge 28 and the divided piece 23 And configured to increase the diameter of the cutting bit 12 by refracting outward.
[0022]
Then, the hollow rod 21 is inserted from the rear end face of the reinforced concrete structure A into the continuous straight hole 1 (hereinafter, this hole is referred to as an existing continuous straight hole 1), and the rod 11 is sequentially inserted into the hollow rod 21 as described above. In the same manner, the expansion bit 22 is inserted until it reaches the bent portion 1a.
[0023]
Thereafter, the hydraulic motor 14 is driven to rotate the hollow rod 21 connected in series via the rod 11 whose base end is gripped to the swivel joint 13 and to inject pressurized water into the hollow rod 21. As a result, the piston 25 is advanced against the force of the spring 29 to advance the wedge body 28 integrally through the rod 11, and as shown in FIG. 22 is preferably enlarged to a larger diameter including all the bent portions 1a so as to be larger than the diameter of the existing continuous straight hole 1 at a position on a drilling planning line where the holes should be originally drilled, and the bent portions 1a are enlarged. To excavate.
[0024]
Further, by driving the propulsion mechanism 15 of the drilling device 10 and propelling the hollow rod 21 through the rod 11, the expanded bit 22 is advanced to expand the bent portion 1a over its entire length. As shown in FIG. 5, the enlarged perforated portion B is excavated and formed. The expansion / contraction mechanism is provided with a small-diameter through-hole 30 communicating from the center of the rear surface of the piston 26 to the center of the distal end surface of the wedge 28 through the piston rod 27. A part thereof is supplied into the enlarged excavated portion B to be excavated, and the cutting pieces and the cuttings cut by the hole expanding bit 22 are passed through the gap between the outer peripheral surfaces of the rods 11 and 21 and the hole wall of the existing continuous straight hole 1. It is configured to discharge to the outside.
[0025]
In this way, after forming the enlarged perforated portion B in which the bent portion 1a is enlarged by the enlarged bit 22, the diameter of the enlarged bit 22 is reduced, and the rod 11 and the hollow rod 21 are sequentially extracted from the existing continuous straight hole 1. Then, a hardening material injection pipe 31 having a smaller diameter than the continuous straight hole 1 (an outer diameter smaller than the inner diameter of the rod 11 composed of the core tube) is inserted into the continuous straight hole 1. As shown in FIG. 6, the tip nozzle portion 31a is projected into the enlarged perforated portion B, and the hardening material C is supplied into the injection pipe 31 from outside the reinforced concrete structure and injected into the enlarged perforated portion B from the tip nozzle portion 31a. , Filling.
[0026]
The hardening material C may be a mortar obtained by kneading cement and sand, or a material obtained by adding bentonite to this mortar, or a mixture of water glass and sand. Any liquid may be used as long as it is a liquid having fluidity and cures after a certain period of time after injection. In order to shorten the hardening time of the hardening material C, it is desirable to use a quick-hardening material. The injection of the hardening material C is performed by installing a mixer (not shown) outside the hole, kneading with the mixer, and supplying the kneaded material to the injection pipe 31 by driving a pump.
[0027]
The hardening material C for the inside of the enlarged perforated portion B needs to be densely filled with uniform strength as a whole so that no weakened portion is formed in the enlarged perforated portion B. When the end face of the filled hardening material C facing the existing continuous straight hole 1 is also perpendicular to the hole axis direction, when the filled hardening material C is drilled again by the cutting bit 12, Although it is desirable to maintain the straightness of the cutting bit 12, it is not always necessary to fill the cutting bit in this way. For example, if the mortar is poorly mixed, it can be easily drilled by the cutting bit 12.
[0028]
In addition, a small-diameter exhaust pipe 33 whose leading end reaches the rear end of the base end of the tip nozzle part 31a is attached to the outer peripheral surface of the injection pipe 31, and the hardening material C is filled in the enlarged perforated part B. Accordingly, the air in the enlarged perforated portion B is discharged to the outside so that the hardening material C is densely filled.
[0029]
Further, since the filling amount of the hardening material C can be determined from the length and the hole diameter of the enlarged perforated portion B, as the hardening material C is filled into the enlarged perforated portion B from the tip nozzle portion 31a, the injection pipe 31 is gradually moved. The tip nozzle portion 31a may be retracted and gradually pulled back from the deep side of the enlarged perforated portion B toward the existing continuous straight hole 1, and after filling, it may be withdrawn through the continuous straight hole 1 together with the injection pipe 31, Since the position of the enlarged perforated portion B and the filling state of the hardening material C cannot be confirmed from the outside, the tip nozzle portion 31a of the injection pipe 31 inserted from the continuous straight hole 1 is inserted into the bottom surface of the enlarged perforated portion B. After contacting the hardening material C, the hardened material C is filled into the enlarged perforated portion B in a compacted state, and the filling pipe is filled. Rotate 31 The tip nozzle portion 31a screwed to the tip portion of the pipe 31 is cut off and left in the filled hardening material C, and only the injection pipe 31 is removed and removed, and the tip nozzle portion 31a is hardened by the hardening material C. Is cut into the rod 11 when it is cut by the tip cutting bit 12 of the rod 11 made of a core tube.
[0030]
The filling of the hardening material C into the enlarged perforated portion B may be performed using the hollow rod 21 provided with the perforated bit 22 without using the injection pipe 31. That is, after the enlarged drilling portion B is excavated and formed by the expanding bit 22 provided at the distal end of the hollow rod 21 as described above, when the hollow rod 21 is pulled out from the continuous straight hole 1, the expanding and contracting mechanism is used. The hardening material C may be filled in the enlarged perforated portion B through a small diameter through hole 30 penetrating from the rear end of the piston 26 to the front end of the wedge body 28. If the filling of the hardening material C is performed using the hollow rod 21 in this manner, the steps of inserting and filling the injection pipe 31 can be omitted.
[0031]
After the hardening material C is filled and hardened in the enlarged perforated portion B in this manner, the rod 11 having the cutting bit 12 attached to the tip thereof is inserted again through the existing continuous straight hole 1 and, if necessary, Then, the rod 11 is extended so that the cutting bit 12 reaches the enlarged drilled portion B, and then the swivel joint 13 is driven to rotate and the propulsion mechanism 15 is operated to propel the rod 11 in the pipe axis direction. As shown in FIG. 7, a hole 1b having the same diameter as the continuous straight hole 1 is drilled in the direction of extending the existing continuous straight hole 1 in the center of the hardened material C by the cutting bit 12 in a straight line. .
[0032]
In this case, when the enlarged piercing portion B is not filled with the hardening material C, when the distal end portion of the rod 11 projects into the enlarged piercing portion B, it is deflected downward due to its own weight and from the bottom of the enlarged piercing portion B. When the hole is cut by the cutting bit 12, the center of the hole may be displaced from the center of the existing continuous straight hole 1, so that the hardening material C is filled in the enlarged perforated portion B as described above. The hole is drilled while the tip of the rod 11 is supported straight in the hole drilled by the cutting bit 12.
[0033]
After drilling the straight hole 1b through the hardening material C as described above, the rod 11 is further propelled while rotating, and the continuous straight hole 1b is cut from the hardening material C into the reinforced concrete structure A by the cutting bit 12. When the bent portion 1a is formed while the continuous straight hole 1 is formed, the bent portion 1a is expanded again in the same manner as described above, and the hardening material C is added to the expanded hole B. After curing and filling, a hole 1b communicating with the hardened material C from the existing continuous straight hole 1 in a straight line is provided, and a continuous straight hole 1 of a predetermined length is provided in the reinforced concrete structure A. It is. The object to be drilled is not limited to the reinforced concrete structure A, and the continuous straight hole 1 can be drilled in the rock in the same manner as described above, even if the rock is rock.
[0034]
FIG. 8 is a flowchart in the case where the continuous straight hole 1 is drilled in an object to be drilled, such as a reinforced concrete structure A, and the drill bit 10 is attached to the tip using the drilling device 10 as described above. The drilling of the continuous straight hole 1 is started in the object to be drilled while the rod 11 being rotated and propelled, and once the continuous straight hole 1 of a predetermined length is drilled, the drilling is temporarily stopped and the continuous straight hole 1 is stopped. The bend of the hole 1 is measured, and if no bend occurs, the drilling is continued and the continuous straight hole 1 is drilled to a predetermined length while adding the rod 11.
[0035]
On the other hand, when bending is measured during drilling of the continuous straight hole 1, the rod 11 is pulled out from the existing continuous straight hole 1, and the hollow rod 21 having the widening bit 22 attached to the tip thereof is connected to the continuous rod 1. After being inserted into the straight hole 1 and enlarging and bending the bent portion 1a to form an enlarged perforated portion B, a hardening material C is filled and hardened in the enlarged perforated portion B, and thereafter, the continuous straight portion is again formed. The rod 11 is inserted into the hole 1, and the continuous straight hole 1 penetrates the hardening material C by the tip cutting bit 12 and communicates with the existing continuous straight hole 1 in a straight line.
[0036]
In the above embodiment, when the object to be drilled is the reinforced concrete structure A and the reinforcing bar a embedded in the reinforced concrete structure A exists on the planned drilling line, the tip cutting bit 12 of the rod 11 is used. The rebar a is propelled while being cut off, and the bent portion 1a of the hole generated at that time is once formed. However, before the bent portion 1a is formed, the rebar a that forms the bent portion 1a is formed. May be detected and the reinforcing bar buried portion may be enlarged and excavated.
[0037]
FIG. 9 shows a flow chart of the process, in which the continuous straight hole 1 is formed in the reinforced concrete structure A while rotating and propelling the rod 11 having the cutting bit 12 attached to the tip as described above using the drilling device 10. While drilling is started and the rod 11 is propelled while drilling the continuous straight hole 1, the presence or absence of the reinforcing bar a, that is, the cutting bit 12 attached to the rod tip abuts on the reinforcing bar and a part thereof Detects whether or not cutting has occurred.
[0038]
This detection is performed by detecting the propulsion force and the rotation torque of the rod 11 by a load cell or the like. If the presence of the reinforcing bar a is not detected, the continuous straight hole 1 is continuously drilled to a predetermined length. When the presence of the reinforcing bar a is detected while the straight hole 1 is drilled, the drilling of the continuous straight hole 1 is temporarily stopped without cutting the reinforcing bar a with the cutting bit 12 and the rod 11 is removed. A hollow rod 21 having a widening bit 22 attached to the distal end thereof withdrawn from the continuous straight hole 1 is inserted into the continuous straight hole 1, and a continuous enlarged drilled portion B is continuously drilled from the continuous straight hole 1. Thereafter, the hardening material C is filled and hardened in the enlarged perforated portion B, and thereafter, the rod 11 is inserted again into the continuous straight hole 1, and the hardening material C is penetrated by the tip cutting bit 12 so as to pass through the hardening material C. Communicates straight to the existing continuous straight hole 1 Is intended to bored continue straight hole 1. The work after the stop of the drilling may be performed after the rebar a is cut off by the cutting bit 12.
[0039]
Further, in the above embodiment, the continuous straight hole 1 is pierced by the rod 11 made of a core tube, that is, core boring, but the present invention can be satisfied even by employing other piercing means. The continuous straight hole 1 can be applied to the drilling of an object to be drilled such as a reinforced concrete structure or a bedrock at any angle including not only the horizontal direction but also the vertical direction.
[0040]
【The invention's effect】
As described above, according to the method for drilling a continuous straight hole according to claim 1 of the present invention, when the hole drilled in the object to be drilled by the drilling device detects the bent portion. Thereafter, the bent portion is enlarged and perforated, and a hardening material is filled in the enlarged perforated portion. After the hardening material is hardened, a hole is formed in a straight line in a direction in which the existing continuous straight hole is extended in the hardened material by the above-described punching device. Since the bent portion of the hole generated during drilling is enlarged, the hardening material is filled into the large-diameter enlarged drilled portion where the bent portion has been eliminated and the bent portion is eliminated, and the hardened material is hardened. When piercing the hardened material, the outer peripheral surface of the piercing device is supported by the hardened material having a uniform strength, and it is possible to accurately and efficiently pierce a continuous linear hole without bending so as to extend a continuous straight hole. And a continuous straight line of the desired length with high accuracy It is possible to form the hole.
[0041]
According to the second aspect of the invention, the object to be drilled is a reinforced concrete structure, and when a hole is continuously drilled in the reinforced concrete structure by a drilling device, a continuous straight hole is drilled. When the presence of an embedded reinforcing bar is detected on the hole, the reinforcing bar buried portion is enlarged and pierced, and the enlarged perforated portion is filled with a hardening material. It is characterized by drilling holes straight in the direction in which the holes are extended, so if there is a reinforcing bar during drilling of continuous straight holes, the propulsion force and torque of the drilling device fluctuate. Therefore, it is possible to easily and reliably detect the location of the reinforcing bar which cannot be confirmed from the outside at all, and therefore, it is possible to enlarge the reinforcing bar buried portion without cutting off the reinforcing bar by the drilling device. Efficient drilling work Since the hardening material is filled and hardened in the enlarged perforated portion, when the hardening material is pierced by the piercing device through the continuous straight hole, the outer peripheral surface of the piercing device is uniform as described above. The present invention enables accurate and efficient drilling in a linear direction extending a continuous straight hole without bending by being supported by a hardened material having strength.
[Brief description of the drawings]
FIG. 1 is a simplified longitudinal side view of a state in which a continuous straight hole is drilled in an object to be drilled;
FIG. 2 is a longitudinal sectional side view of a tip portion of a hole in a state where a bent portion is formed in the hole;
FIG. 3 is a longitudinal side view of a distal end portion of a hollow rod provided with a perforated bit;
FIG. 4 is a vertical sectional side view of a distal end portion of a hollow rod in a state where a diameter of a hole expanding bit is expanded;
FIG. 5 is a longitudinal sectional side view showing a state where an enlarged perforated portion is formed in a bent portion;
FIG. 6 is a vertical cross-sectional side view showing a state where a hardening material is filled.
FIG. 7 is a longitudinal sectional side view showing a state where a straight hole is formed in a hardening material.
FIG. 8 is a flowchart for explaining an embodiment of the present invention;
FIG. 9 is a flowchart for explaining another embodiment of the present invention.
[Explanation of symbols]
A reinforced concrete structure
B Enlarged hole
C hardening material
1 continuous straight hole
1a Bent section
10 Punching device
11 Rod
12 Cutting bits
21 Hollow rod
22 Expanding bit

Claims (2)

A method of continuously piercing a hole in an object to be pierced, wherein when a hole formed by a piercing device is bent, the bent portion is detected, and then the bent portion is enlarged and pierced. This enlarged perforated portion is filled with a hardening material, and after the hardening material is hardened, a hole is formed in the hardening material in a straight line in a direction of extending the existing continuous straight hole by the punching device. Drilling method of hole. When a hole is continuously drilled in a reinforced concrete structure by a drilling device, if the presence of an embedded reinforcing bar is detected on a continuous straight hole to be drilled, the reinforcing bar buried portion is enlarged and drilled. Filling the portion with a hardening material, after the hardening of the hardening material, a hole is formed in a straight line in the direction of extending the existing continuous straight hole in the hardening material by the punching device, characterized in that Perforation method.

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