JP5461253B2 - Drilling machine for reinforced concrete body and method for drilling in reinforced concrete body - Google Patents

Description

  The present invention is a reinforced concrete body capable of cutting a reinforcing bar with a smooth cut surface to form a hole in a reinforced concrete body with good workability and efficiently and reasonably constructing the work with a single equipment configuration. The present invention relates to a hole drilling machine and a method for drilling holes in a reinforced concrete body.

  Patent Documents 1 and 2 disclose a technique for drilling holes in a reinforced concrete body when dismantling the reinforced concrete body. Patent Document 1 “Method for Drilling Continuous Groove into Reinforced Concrete Structure” is a method for detecting the position of a reinforcing bar in advance, and along the ridge line on one side of a continuous groove of a predetermined width to be drilled, the surface of the reinforced concrete structure To a part deeper than the position where the reinforcing bar is detected, a single continuous narrow groove is drilled with a wall saw, each reinforcing bar is cut at one point, and a hole adjacent to the narrow groove is drilled. By drilling the position in the continuous groove with a predetermined width from the surface of the reinforced concrete structure with a percussion drilling machine, the rebar in the area corresponding to the predetermined width is cut and removed, and further, using the same percussion drilling machine Drill a continuous groove of depth.

  Patent Document 2 “Method for Drilling Continuous Groove into Reinforced Concrete Structure” is a method for detecting the position of a reinforcing bar in advance, and along the ridge lines on both sides of a continuous groove of a predetermined width to be drilled, the surface of the reinforced concrete structure To the part deeper than the position where the rebar is detected, two rows of narrow grooves are drilled with a wall saw, and each reinforcing bar is cut at two points. The area is scraped from the surface of the reinforced concrete structure to form a shallow continuous groove with a predetermined width, and a continuous groove with a predetermined depth is drilled by a percussion drilling machine.

JP 2007-255081 A JP 2007-255082 A

  In any background art, continuous grooves can be formed satisfactorily, but two types of devices, a wall saw and a percussion drilling machine, have to be operated separately according to work procedures. In addition, there are various wall saws for cutting reinforcing bars, such as when the reinforcing bars are arranged shallow or deep from the surface of the concrete structure, so it is necessary to prepare multiple wall saw disk cutters. When trying to use both disk cutters, the size of the disk cutter was inevitably increased, and in any case, handling was complicated. Furthermore, there was a case where a separate punching work was necessary.

  From the above, it has been desired to devise a technique that can efficiently and rationally drill holes in a concrete body in which reinforcing bars are embedded.

  The present invention was devised in view of the above-described conventional problems, and with a single device configuration, a rebar can be cut with a smooth cut surface to form a hole in a reinforced concrete body with good workability, and the work An object of the present invention is to provide a drilling machine for reinforced concrete bodies that can be efficiently and rationally constructed and a method for drilling holes in reinforced concrete bodies.

  A drilling machine for a reinforced concrete body according to the present invention is a drilling machine that drills holes in a reinforced concrete body, and is capable of switching between reciprocating driving and rotational driving, and rotational driving, and a drive unit that drives a rod, The large-diameter perforated bit provided at the front end, and the large-diameter perforated bit are detachably mounted in front of the large-diameter perforated bit and protruded forward of the large-diameter perforated bit. Along with concrete drilling with a drill bit, a small-diameter drill bit drilling a pilot hole in concrete at the front position of the large-diameter drill bit, and a hollow cylindrical shape with the same outer diameter as the outer diameter of the large-diameter drill bit And a ring-shaped bit portion at the front end, which is detachably mounted in front of the large-diameter drill bit, protrudes forward of the large-diameter drill bit, and is rotated by the rod Characterized by comprising the concrete while cutting the reinforcing bars and reinforcing bars cutting bits forming a ring-shaped cut grooves.

  The method for drilling holes in a reinforced concrete body according to the present invention is a method for drilling holes in a reinforced concrete body using the above-mentioned drilling machine for reinforced concrete bodies, and is directed toward the reinforcing bar position by the small diameter drill bit and the large diameter drill bit. A concrete drilling step for drilling in concrete, a reinforcing bar cutting step for forming a ring-shaped cutting groove in the concrete while attaching the reinforcing bar cutting bit and cutting the reinforcing bar with the reinforcing bar cutting bit, and removing the reinforcing bar cutting bit A concrete crushing step of crushing and drilling the concrete inside the ring-shaped cutting groove with the small-diameter drill bit and the large-diameter drill bit.

  In the drilling machine for reinforced concrete bodies and the method for drilling holes in the reinforced concrete bodies according to the present invention, the reinforced concrete bodies can be drilled with good workability by cutting the reinforcing bars with a smooth cut surface with a single equipment configuration. At the same time, the work can be performed efficiently and rationally.

It is a side view of the state comprised with the parent-child bit which shows suitable one Embodiment of the drilling machine for reinforced concrete bodies which concerns on this invention. It is a partially broken side view which shows the principal part of the drilling machine for reinforced concrete bodies of FIG. It is a perspective view which shows the reinforcing bar cutting bit used for the drilling machine for reinforced concrete bodies of FIG. It is process drawing which shows suitable one Embodiment of the method of drilling in the reinforced concrete body which concerns on this invention. It is explanatory drawing explaining the mode of the cross section of the hole which cut | disconnected the reinforcing bar by this embodiment, and the mode of the cross section of the undesirable hole. It is a partially broken side view which shows the principal part of the modification of the drilling machine for reinforced concrete bodies shown in FIGS.

  Hereinafter, preferred embodiments of a drilling machine for a reinforced concrete body according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a drilling machine 1 for a reinforced concrete body according to the present embodiment. As shown in FIGS. 1 and 2, the reinforced concrete body drilling machine 1 is mainly provided with a drive unit 2, a rod 3 detachably connected to the drive unit 2, a front end of the rod 3, and a concrete C A large-diameter perforation bit 4 and a parent-child bit 6 composed of a small-diameter perforation bit 5 are drilled in a reinforced concrete body 7 in which a rebar R is embedded in concrete C.

  The drive unit 2 includes a rotation motor 8 and a transmission 9 connected to the rotation motor 8. As is well known in the art, the transmission 9 outputs the rotational motor output as it is as a rotational driving force, or the output format can be switched freely by a shifting operation, and the rotational motor output is output as a rotational driving force and a reciprocating driving force. To do. The drive unit 2 transmits the rotation motor output to the rod 3 connected to the rotation motor 8 via the transmission 9, and the rod 3 is driven to rotate around the axis along with the reciprocating drive along the axial direction by a speed change operation. Or it is simply driven to rotate around the axis.

  At the front end of the rod 3, a large-diameter drill bit 4 of a parent-child bit 6 is detachably provided by a screw type or a chuck type. A bit portion 4 a for drilling holes in the concrete C is provided on the front end face of the large-diameter drill bit 4. Further, a male screw body 4b is provided at the center of the front end surface of the large-diameter perforated bit 4 so as to protrude forward.

  The large-diameter perforated bit 4 is provided with a small-diameter perforated bit 5 that forms a parent-child bit 6 together with the large-diameter perforated bit 4. The small-diameter perforated bit 5 is obtained by reducing the diameter of the large-diameter perforated bit 4, and a bit portion 5 a for drilling holes in the concrete C is provided on the front end surface thereof. A female screw portion 5b is formed at the rear end portion of the small-diameter drill bit 5 so as to be detachably attached to the large-diameter drill bit 4. The female screw portion 5b is screwed onto the male screw body 4b of the large-diameter drill bit 4. Combined. As a result, the small-diameter perforation bit 5 protrudes in front of the large-diameter perforation bit 4. The connection between the large-diameter drill bit 4 and the small-diameter drill bit 5 is not limited to a screw type, but may be a chuck type.

  The small-diameter perforated bit 5 is rotated by the rod 3 that is driven to rotate, and the position of the bit portion 5a is moved around the axis of the rod 3, while the concrete C is crushed by striking or vibrating by the rod 3 that is driven reciprocally. A pilot hole PH is drilled in the concrete C at a position in front of the diameter drilling bit 4. At the same time, the large-diameter drill bit 4 is reciprocally driven while the position of the bit portion 4a is moved around the axis of the rod 3 by being rotated by the rod 3 that is rotationally driven at a position behind the small-diameter drill bit 5. The concrete C is crushed by striking or vibrating, and the pilot hole PH is cut and widened to form a large hole H.

  In the present embodiment, a rebar cutting bit 10 for cutting the rebar R is provided as a replacement part of the small-diameter drill bit 5 constituting the parent-child bit 6 as shown in FIG. The reinforcing bar cutting bit 10 is mainly provided at the hollow cylindrical main body part 10a opened at the front and sealed at the rear, the ring-shaped bit part 10b provided at the front end of the main body part 10a, and the rear end of the main body part 10a. And the female screw portion 10c. The ring-shaped bit part 10b is provided along the front-end opening part of the hollow cylindrical main-body part 10a.

  The rebar cutting bit 10 is detachably mounted in front of the large-diameter drilling bit 4 by screwing the female screw portion 10c into the male screw body 4b of the large-diameter drilling bit 4 from which the small-diameter drilling bit 5 is removed. Thus, it is provided in front of the large-diameter drill bit 4. A chuck type may be adopted for the connection between the large-diameter drill bit 4 and the reinforcing bar cutting bit 10. The outer diameter dimension of the main body portion 10a of the reinforcing bar cutting bit 10 is such that the reinforcing bar R cut thereby does not interfere with the succeeding large diameter drilling bit 4 and the hole H drilled by the large diameter drilling bit 4 is also used. It is formed with the same outer diameter as the large-diameter perforated bit 4 so that the reinforcing bar cutting bit 10 can be smoothly inserted.

  The reinforcing bar cutting bit 10 is rotated by the rod 3 driven only to rotate, and forms a ring-shaped cutting groove S in the concrete C while cutting the reinforcing bar R inside the reinforced concrete body 7 (see FIG. 4C). The outer groove surface Sf of the ring-shaped cutting groove S is continuous with the inner surface of the hole H drilled by the large-diameter drill bit 4, while the concrete cylindrical portion X remaining inside the ring-shaped cutting groove S is cut. Including the reinforcing bar piece RP (see FIG. 4D), it is received inside the main body 10a.

  The ring-shaped bit 10b is a cutter for cutting the reinforcing bars R. The material of the ring-shaped bit 10b is a large-diameter drill bit 4 for crushing and drilling concrete C, or bit portions 4a and 5a of the small-diameter drill bit 5. In contrast, ultra-hard materials, composite materials mixed with ultra-hard materials, diamond, etc. are used.

  Next, a method of drilling holes in the reinforced concrete body 7 using the reinforced concrete body drilling machine 1 will be described. As shown in FIGS. 1 and 4, first, a parent-child bit 6 in which a large-diameter perforation bit 4 and a small-diameter perforation bit 5 are combined is attached to the front end of the rod 3. The drive unit 2 is activated, and the rod 3 is reciprocally driven and rotationally driven by the rotary motor 8 by a speed change operation of the transmission 9.

  The rod 3 is advanced toward the reinforced concrete body 7 and, as shown in FIG. 1 and FIG. 4 (A), the concrete C is moved by the small-diameter drill bit 5 at the front position of the large-diameter drill bit 4 by the rotation, hammering and vibration by the rod 3. The pilot hole PH is drilled at the same time, and at the same time, the concrete C is drilled by the subsequent large-diameter drill bit 4 to form the hole H by spreading the pilot hole PH. By this drilling operation, the reinforced concrete body 7 is drilled toward the rebar R position.

  The position of the reinforcing bar R can be known by a change in a state when the pilot hole PH is drilled with the prior measurement or the small diameter drill bit 5. Even when the small-diameter drill bit 5 gives up the reinforcing bar R, the position of the reinforcing bar R can be known by the change in the drilling state by the large-diameter drill bit 4. When the bar arrangement position of the reinforcing bar R is reached, the concrete drilling step is finished.

  When the rebar R position is reached, the parent and child bit 6 together with the rod 3 is extracted from the hole H, replaced with the small diameter drill bit 5, and the reinforcing bar cutting bit 10 is mounted in front of the large diameter drill bit 4. Together with the rod 3 and the large diameter drilling bit 4, the reinforcing bar cutting bit 10 is inserted into the foremost position of the hole H drilled by the large diameter drilling bit 4.

  Next, as shown in FIG. 4B, the drive unit 2 is activated, and the rod 3 is only rotationally driven by the speed change operation of the transmission 9. The rod 3 is advanced to the back of the reinforced concrete body 7, and the ring-shaped cutting groove S is formed in the concrete C while cutting the reinforcing bar R with the reinforcing bar cutting bit 10 as shown in FIG. The reinforcing bar cutting bit 10 surrounds the cylindrical part X of the concrete C including the cut reinforcing bar piece RP with the main body 10a and receives it inside, and the ring-shaped cutting groove S formed by the reinforcing bar cutting bit 10 includes: The inner surface of the hole H drilled with the large-diameter drilling bit 4 is continuously connected.

  The formation of the ring-shaped cutting groove S by the reinforcing bar cutting bit 10 is approximately the same as the length dimension of the pilot hole PH (the length dimension of the small diameter drilling bit 5 protruding forward from the large diameter drilling bit 4). Complete with a slightly longer stroke than the length you added. When the cutting of the reinforcing bar R is completed, the reinforcing bar cutting step is terminated.

  When the cutting of the reinforcing bar R is completed, the reinforcing bar cutting bit 10 is extracted from the hole H together with the large diameter drilling bit 4 and the rod 3, replaced with the reinforcing bar cutting bit 10, and the small diameter drilling bit 5 is mounted again. The parent and child bit 6 is inserted into the hole H together with the rod 3, and is inserted to the cylindrical portion X of the concrete C remaining inside the ring-shaped cutting groove S. The drive unit 2 is activated, and the rod 3 is reciprocally driven and rotated by a speed change operation of the transmission 9.

  The rod 3 is advanced to the back of the reinforced concrete body 7, and as shown in FIG. 4 (D), the cylindrical portion X is crushed by both the small-diameter drill bit 5 and the large-diameter drill bit 4 by rotation, striking and vibration by the rod 3. Drill holes. As a result, holes H are formed by drilling holes in the reinforced concrete body 7. The reinforcing bar pieces RP separated by crushing the cylindrical portion X can be easily removed by adsorbing with a magnet or the like (not shown) inserted into the hole H. When the crushing of the cylindrical portion X is completed, the concrete crushing step is finished.

  Further, when the drilling operation for the concrete C is advanced, if the state of FIG. 4 is continued, the process proceeds to the concrete drilling step as it is. Moreover, when the reinforcing bar R is arranged further in the back of the reinforced concrete body 7, the reinforcing bar cutting step and the concrete crushing step may be repeated according to reaching the reinforcing bar R position.

  According to the piercing machine 1 for a reinforced concrete body according to the present embodiment described above, the rebar cutting bit 10 is attached to the driving unit 2 with the rod 3 for driving the parent / child bit 6 in place of the small diameter drilling bit 5. Thus, it is possible to drill holes in the reinforced concrete body 7 in which the reinforcing bars R are embedded with a single device configuration.

  Since the reinforcing bar cutting bit 10 is driven to rotate and cuts the reinforcing bar R, the reinforcing bar R can be cut along the rotation trajectory along a smooth cutting surface T as shown in FIG. When the reinforcing bar R is broken by striking or vibrating, as shown in FIG. 5 (B), a rough fractured surface Z that is torn off is likely to be formed. When drilling with the small-diameter drill bit 5 or the large-diameter drill bit 4 that is continued with the above, inconveniences such as the rod 3 etc. being caught can occur. On the other hand, in the present embodiment, the inner surface of the hole H at the position of the reinforcing bar R can be smoothed, and the rough fractured surface Z does not remain in the hole H. can do.

  Also, with respect to the work procedure, unlike the background art, it is not necessary to use two types of equipment according to the work procedure, and both the drilling of the concrete C and the cutting of the rebar R can be performed by the same rod 3 insertion operation. From this aspect, it is easy to handle and can improve operability and workability. Furthermore, in a series of operations for drilling concrete C and rebar R, the cutting operation of rebar R by rebar cutting bit 10 is the extent to which the length dimension of pilot hole PH and the outer diameter dimension of rebar R are added. For the concrete C, which requires only a short stroke and is easy to drill, the labor and consideration required for cutting the rebar R can be minimized and the drilling operation can be performed efficiently and rationally.

  Further, according to the method of drilling holes in the reinforced concrete body 7 according to the present embodiment, the hole drilling machine 1 that simply replaces the small-diameter drill bit 5 and the reinforcing bar cutting bit 10 is used to simply drill the hole H in the drilling direction. By simply inserting and removing the rod 3, the concrete drilling step for drilling the concrete C, the reinforcing bar cutting step for cutting the reinforcing bar R, and the concrete C inside the ring-shaped cutting groove S remaining by cutting the reinforcing bar R are crushed. The concrete crushing step for drilling can be carried out sequentially, whereby the reinforced concrete body 7 in which the rebar R is embedded can be drilled with good workability.

  Since the ring-shaped cutting groove S is formed to cut the rebar R, as shown in FIG. 5, the inner surface of the hole H at the position of the rebar R can be smoothed to ensure good drilling workability. it can. Furthermore, in a series of operations for drilling concrete C and rebar R, the rebar R cutting operation requires only a short stroke after the concrete drilling step. Therefore, the labor and consideration required for cutting can be kept to a minimum, and work can be performed efficiently and rationally.

  FIG. 6 shows a modification of the concrete body drilling machine 1 according to the embodiment. In this modification, instead of the method of exchanging the small-diameter perforated bit 5 and the reinforcing bar cutting bit 10, a method of adding the reinforcing bar cutting bit 10 to the parent-child bit 6 is used. Specifically, a male screw portion 5c is formed on the outer periphery of the small-diameter perforated bit 5, and the female screw portion 10c of the reinforcing bar cutting bit 10 is screwed into the male screw portion 5c and attached.

  In this way, when moving from the concrete drilling step to the reinforcing bar cutting step and when shifting from the reinforcing bar cutting step to the concrete crushing step, there is no need to remove and attach the small-diameter drill bit 5 and further work. Efficiency can be improved.

DESCRIPTION OF SYMBOLS 1 Reinforced concrete body drilling machine 2 Drive part 3 Rod 4 Large diameter drilling bit 5 Small diameter drilling bit 7 Reinforced concrete body 10 Reinforcing bar cutting bit 10b Ring-shaped bit part C Concrete H hole PH Pilot hole R Rebar S Ring-shaped cutting groove X Ring shape The cylindrical part of concrete inside the cutting groove

Claims (2)

A drilling machine that drills holes in reinforced concrete bodies.
A reciprocating drive and a rotational drive, and a rotational drive can be switched, and a drive unit that drives the rod;
A large-diameter perforated bit provided at the front end of the rod;
The large-diameter drill bit is detachably mounted in front of the large-diameter drill bit and protrudes forward from the large-diameter drill bit. A small-diameter drill bit that drills a pilot hole in concrete at a position in front of the diameter drill bit;
The large-diameter perforated bit is formed in a hollow cylindrical shape having the same outer diameter as the outer diameter and has a ring-shaped bit portion at the front end, and is detachably mounted in front of the large-diameter perforated bit. A drilling machine for a reinforced concrete body, comprising a reinforcing bar cutting bit that forms a ring-shaped cutting groove in concrete while cutting the reinforcing bar by the rod that is projected forward and driven to rotate. A method for drilling holes in a reinforced concrete body using the drilling machine for reinforced concrete bodies according to claim 1,
Concrete drilling step for drilling in concrete toward the reinforcing bar position by the small diameter drill bit and the large diameter drill bit;
Reinforcing bar cutting step for forming a ring-shaped cutting groove in concrete while mounting the reinforcing bar cutting bit and cutting the reinforcing bar with the reinforcing bar cutting bit;
A concrete crushing step of removing the reinforcing bar cutting bit and crushing and drilling the concrete inside the ring-shaped cutting groove with the small diameter drill bit and the large diameter drill bit,
A method for drilling holes in a reinforced concrete body.

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