JPH05256032A - Controlling method for operation of multiple core drill - Google Patents

Abstract

PURPOSE:To raise the efficiency of operation by a method in which the operation of a multiple core drill for core-drawing operations is controlled according to the condition of wall on the drilling position. CONSTITUTION:A rotary plate-fixing base 1 to be fixed by an anchor bolt 2 to the drill center and attraction metal plate 15 to support the reaction of the core drill on the periphery of the base 1 are attached to the concrete wall on the drilling position. A core-drawing operation is made by using a multiple- type core drill in which a core drill is provided to the tip of a slewing frame 6 to be fixed to the metal plate 15 on a setting position and supported rotatably by the support shaft of the base 1, where a rotary bit 10 is pressed on the concrete wall for drilling by a preset pressing force. When an excessive load beyond a set value is applied to the bit 10 during the core-drawing operation, the times of the excessive load are counted and reach a set times, the bit 10 is separated from the concrete wall to restore it to a waiting position for the next drilling operation. The core drill can thus be protected and the core- drawing operation can be automatically made.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a concrete wall surface,
Or a large diameter hole on the floor surface, and a small number of small diameter holes on the outer peripheral part of the multiple core core drill to be used adjacently in the inner peripheral direction so as to avoid the embedded reinforcing bars in the wall etc. ,
It relates to a method of controlling the operation.

[0002]

2. Description of the Related Art When a large-diameter hole is formed in a concrete wall or a floor surface in a pump room, a breaker is used to crush the concrete wall or floor at the hole. However, vibration is transmitted to this concrete wall and other parts of the building,
For this reason, there is a defect that cracks occur in the concrete wall and floor. For this reason, recently, a core drill has been used instead of a breaker, and a large number of small diameter holes in the outer peripheral direction of a large diameter hole are formed adjacent to each other. Has been done.

[0003]

A conventional core drill uses a plurality of core drills alone according to the small diameter of a hole to be drilled, and fixes the core drills at the drilling positions to concrete walls or floors using anchor bolts or the like. , Drilling work is performed, and when this drilling, that is, one core removal is completed, move this core drill unit to an adjacent drilling position, fix it again with anchor bolts, etc., and repeat fixing and moving sequentially in the circumferential direction. Since it is perforated with holes, if reinforcing bars are embedded in the wall at the perforation position, it becomes impossible to perforate,
The work efficiency is poor.

It is an object of the present invention to control the operation of a multiple core drill in core removal work in accordance with the wall condition at the drilling position to improve the work efficiency.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a rotary plate mounting base fixed to a concrete wall surface at a drilling position by an anchor bolt at the center of the drilling hole, and this mounting. The adsorption metal plate that supports the reaction force of the core drill is fixed on the outer periphery of the base, and is pivotally supported by the support shaft of the mounting base, and is fixed to the adsorption metal plate at the set position by the fixing means. When performing core removal work using a multiple core drill with a core drill provided at the tip of the revolving frame, a rotating bit is pressed against a concrete wall surface with a preset pressing force to punch the When the bit is overloaded more than the set value during work, the number of overloads is counted, and when it reaches the set number, the bit is separated from the concrete wall and waits. Back to the position, so as to initiate the drilling operation of the next order to protect the core drill, automatically summarized in that performing cored work.

[0006]

[Operation] A turning frame having a core drill and a fixing means at its tip is rotatably supported by a mounting base which is fixed in advance on a concrete surface, and the turning frame is set at an adsorbing metal plate fixed to the concrete surface by the fixing means. The core drill can be easily moved during core removal work, and the core drill can be easily and firmly fixed, and the core drills can be accurately moved on the same circumference to align the core removal holes. ..

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multiple core drill used in an operation control method for a multiple core drill of the present invention will be described below with reference to the embodiments shown in FIGS. In FIGS. 1 and 2, 1 is a concrete wall, or a rotary plate mounting base that is fixed in advance to a concrete wall or the like with a plurality of anchor bolts 2 at the center position of a hole drilled in a large diameter of the floor, which is of a relatively small size. It has an outer shape such as a circular shape or a square shape, and a bolt 3 that serves as a rotation support shaft is provided in the center of the projecting piece.

The rotating plate 4 is fitted to the bolt 3 projecting from the center plate of the rotating plate mounting base 1, and the rotating plate 4 is attached to the bolt 3.
A fastening tool 5 is screwed so that it can be fixed at a set angle in the orbiting direction, and the rotary plate 4 is clamped and fixed by the fastening tool 5, and the rotary plate 4 is swung. It is fixed to the center of the frame 6 with bolts. The revolving frame 6 is formed by arranging two angle members in parallel and bridging a horizontal rail so as to be integrated, and is configured to be adjustable in expansion and contraction as needed.

The core drill mounts 7, 7 are attached to the tip of the revolving frame 6 with bolts. In this case, the core drill mounts 7, 7 are located at both ends of the revolving frame 6.
When the turning frame 6 makes a turning motion with the bolt 3 as a central axis, both mounting bases 7 and 7 draw a locus having the same radius.

A pillar 8 is established on the upper surface of the core drill mount 7, and a lifting frame 9 is supported so that the pillar 8 can be slid on the pillar 8 and fixed at a set position, and a core is removed from the lifting frame 9. Bit 10 and this bit 10
And a moving motor 12 for moving (elevating) the elevating frame 9 along the column 8.

Further, one or two or more electromagnets 13 are provided on the lower surfaces of both sides of the core drill mounting base 7 so that the electromagnets 13 are energized and excited by the operation of the switch 14 provided on the revolving frame or the like. The attracting force of the iron core of the electromagnet 13 is directed toward the concrete wall surface to be drilled,
A donut-shaped magnetically attracting adsorbing metal plate 15 is attached to the concrete wall W so as to face the electromagnet 13.

The adsorbing metal plate 15 is a donut-shaped disc having a small diameter which is close to the circumference drawn when the bit 10 attached to the tip of the revolving frame 6 reciprocally revolves around the bolt 3 together with the frame. This is divided into two or more and divided into two or more arc-shaped ones to form a required circular shape, which is fixed to the concrete wall W by the anchor bolts 16.

Lifting frame 9, motor 11, bit 10
When drilling a concrete wall with the bit of the core drill, the reaction force is received by the core drill mounting base and the turning frame via the lifting frame and the columns. Even with respect to this reaction force, the adsorption force by the electromagnet is determined so that the tip of the bit is pressed against the concrete surface at a required pressure, but a fixing bracket 17 having a U-shaped cross section is provided to supplement this electromagnet. It can also be used.

An operation control method for drilling a large diameter hole in a concrete wall or floor using the multiple core drill constructed as described above will be described below with reference to FIG. First, attach the rotating plate mounting base 1 to the center of the hole to be drilled.
, And the adsorbing metal plate 15 is fixed to the outer periphery thereof via anchor bolts 2 and 16, respectively. Next, the revolving frame 6 is arranged on the rotary plate mounting base 1. At this time, the bolt 3 is passed through the center of the rotary plate 4 fixed to the swivel frame, and the fastening tool 5 is screwed onto the bolt 3 to excite the electromagnet 13 or the fixing metal fitting 17, or both of them. After fixing the revolving frame 6 to a predetermined angle, the motor 1
In step 2, the elevating frame 9 is pressure-bonded to the concrete surface with a required pressure, and the bit 10 is driven by the motor 11 to punch.

When starting the multiple core drill, the electromagnetic valve for discharging the cooling water is opened so that the cooling water is applied to the tip of the bit, and the bit is rotated. Then, a predetermined fixed time is set as a preparatory exercise, and when a predetermined time for this preparation has elapsed, the bit 10 is pressed against the concrete wall surface with a required pressure by the elevating frame to start core removal. In this way, while the bit is pressed against the concrete wall, it is perforated by the rotation of the bit. When the embedded rebar or stone contacts the rotating bit, the rotating motor of the bit is loaded with a load larger than the set value.

When the load of the bit becomes larger than the set value, the rotation speed of the bit is switched to a predetermined low speed rotation to operate, and when the load becomes less than the set value, the bit is rotated at the rated speed. Then, it is detected whether the overload has occurred again during the rated rotation of this bit.

At this time, if an overload occurs, the number of overloads is counted and the bit rotation is stopped. Then, it detects whether the number of overloads reaches the set number, and if the number of overloads does not reach the set number, raise the bit for a certain period of time,
Press again to re-rotate the bit and continue the core removal work operation.

When the number of load times reaches the set number, the electromagnetic valve for cooling water is closed, an alarm is issued, the bit is lifted and stopped if necessary, and it is detected that it is impossible to continue drilling work.

When the rated operation of the bit starts descent of the bit, that is, when a predetermined time has elapsed after pressing the concrete wall surface, the number of overloads is reset, and when the constant time has not elapsed from the start of the bit operation, the bit is rated. Continue the operation and detect whether the bit has penetrated to the set position. When it detects that it has penetrated to the set position, core removal is completed, so the bit rotation is stopped, the cooling water solenoid valve is closed, the bit is raised, that is, separated from the concrete wall surface, returned to the standby position, and one core is removed. Complete the work.

When the concrete wall is penetrated by the bit in this way, the bit is retracted and the swivel frame 6 is released from the mounting base to be swivelable. Then, with the bit diameter or a predetermined interval as one pitch, the swivel frame is swung for only one pitch, that is, swiveled and fixed again as shown in FIG. 1, and the bit is driven to perform the next punching. In this way, the holes are successively drilled, a large number of small holes are adjacently drilled along the periphery of the hole of large diameter, and the concrete inside is cut off to open.

[0021]

The operation control method of the multiple core drill according to the present invention, when drilling a concrete wall surface by rotating a bit,
When the bit is overloaded and the number of overloads reaches the set number or more, the bit is raised to stop the drilling work, and the drilling is performed at another position, thus protecting the core drill, and It has an advantage that a large-diameter hole can be drilled by automatic operation.

[Brief description of drawings]

FIG. 1 is a plan view of a multiple core drill of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a control flow chart when core removal work is performed using the multiple core drill of the present invention.

[Explanation of symbols]

 1 Rotating plate mounting base 2 Anchor bolts 3 Bolts serving as a spindle 4 Rotating plate 6 Revolving frame 7 Core drill mounting base 10 Bit 13 Electromagnet 15 Adsorption metal plate

Claims (1)

[Claims] 1. A rotating plate mounting base fixed to the concrete wall surface at the drilling position with anchor bolts at the center of the drilling, and an adsorbing metal plate supporting the reaction force of the core drill at the outer periphery of the mounting base, Also, a core is formed by using a multiple core drill which is rotatably supported by a support shaft of the mounting base and is fixed to the adsorbing metal plate at a set position by a fixing means and which is provided with a core drill at the tip of the rotating frame. In the case of punching work, the rotating bit is pressed against the concrete wall surface with a preset pressing force to punch, and at the time of this drilling work, when the bit is overloaded more than the set value, this overload Count the number of times, and when it reaches the set number of times, move the bit away from the concrete wall and return it to the standby position to start the next drilling work and keep the core drill. An operation control method for multiple core drills, which protects and automatically performs core removal work.