JPH0457486B2 - - Google Patents
Info
- Publication number
- JPH0457486B2 JPH0457486B2 JP1048441A JP4844189A JPH0457486B2 JP H0457486 B2 JPH0457486 B2 JP H0457486B2 JP 1048441 A JP1048441 A JP 1048441A JP 4844189 A JP4844189 A JP 4844189A JP H0457486 B2 JPH0457486 B2 JP H0457486B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid chamber
- reinforced concrete
- side liquid
- cutter
- rotating cutter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 38
- 239000011150 reinforced concrete Substances 0.000 claims description 33
- 230000003014 reinforcing effect Effects 0.000 claims description 26
- 238000005553 drilling Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 14
- 238000001514 detection method Methods 0.000 description 16
- 239000004567 concrete Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/005—Devices for the automatic drive or the program control of the machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は鉄筋コンクリート製品の削孔方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for drilling holes in reinforced concrete products.
（従来技術）
鉄筋コンクリート製品に削孔する必要性は非常
に高い。例えば、下水管が接続されるマンホール
の場合、工場生産したヒユーム管に前もつて削孔
することができれば、マンホール設置場所に型枠
を配置してコンクリートを現場打ちする手間を要
さず、作業の能率化を図ることができる。(Prior art) There is a great need to drill holes in reinforced concrete products. For example, in the case of a manhole to which a sewage pipe is connected, if holes can be drilled in advance in the factory-produced fume pipe, there will be no need to place formwork at the manhole installation site and pour concrete on-site. It is possible to improve efficiency.
前記に鑑み別途提案された鉄筋コンクリート製
品の削孔方法（特開昭58−102719号公報；以下、
先行削孔方法という。）は、回転カツタおよび鉄
筋コンクリート製品の一方を他方に向けて押し付
け、回転カツタと鉄筋コンクリート製品の鉄筋と
が当つて回転カツタの回転抵抗が予め設定した値
になつたとき、回転カツタまたは鉄筋コンクリー
ト製品の押圧力の一時的な低下とその回復とを繰
り返すことを含む。 In view of the above, a method for drilling holes in reinforced concrete products was separately proposed (Japanese Patent Application Laid-open No. 102719/1983; hereinafter,
This is called the advance drilling method. ) presses one of the rotating cutter and the reinforced concrete product toward the other, and when the rotating cutter and the reinforcing steel of the reinforced concrete product come into contact and the rotational resistance of the rotating cutter reaches a preset value, the rotating cutter or the reinforced concrete product is pressed. It involves repeated temporary drops in pressure and its recovery.
先行削孔方法によれば、回転カツタと鉄筋コン
クリート製品の鉄筋とが当つて回転カツタの回転
抵抗が予め設定した値になつたとき、回転カツタ
または鉄筋コンクリート製品の押圧力を一時的に
低下し、再び回転カツタまたは鉄筋コンクリート
製品を押し付けて削孔するので、粘り強い鉄筋を
コンクリートと同じように困難なく切断できる。 According to the advance drilling method, when the rotary cutter and the reinforcing steel of the reinforced concrete product come into contact and the rotational resistance of the rotary cutter reaches a preset value, the pressing force of the rotary cutter or the reinforced concrete product is temporarily reduced, and then the reinforcing bar of the reinforced concrete product is pressed again. Since holes are drilled by pressing a rotating cutter or reinforced concrete product, tenacious reinforcing bars can be cut without difficulty in the same way as concrete.
（発明が解決しようとする問題点）
先行削孔方法は、回転カツタと鉄筋コンクリー
ト製品の鉄筋とが当つて回転カツタの回転抵抗が
予め設定した値となつたとき、液圧ジヤツキの押
し側液室を開放することにより、押圧力を一時的
に低下させている。この状態では、押し側液室に
圧力が存在することから、回転カツタおよびび鉄
筋の一方を他方に向けて押し付ける力が働き、回
転カツタが鉄筋から積極的に離れることはない。
そのため、回転カツタの鉄筋への食い込みを確実
に防止または解消できる保証はない。(Problem to be Solved by the Invention) In the pre-drilling method, when the rotary cutter comes into contact with the reinforcing bars of the reinforced concrete product and the rotational resistance of the rotary cutter reaches a preset value, the push-side liquid chamber of the hydraulic jack By opening , the pressing force is temporarily reduced. In this state, since there is pressure in the push-side liquid chamber, a force acts to push one of the rotary cutter and the reinforcing bar toward the other, and the rotary cutter does not actively separate from the reinforcing bar.
Therefore, there is no guarantee that cutting into the reinforcing steel by the rotating cutter can be reliably prevented or eliminated.
従つて、本発明の目的は、回転カツタを鉄筋か
ら積極的に引き離すことにより、食い込みを確実
に解消する鉄筋コンクリート製品の削孔方法を提
供することにある。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for drilling holes in reinforced concrete products that reliably eliminates digging by actively separating a rotary cutter from a reinforcing bar.
（問題点を解決するための手段）
本発明は、ピストンによつて仕切られた押し側
液室と戻し側液室とを備える複動型の液圧ジヤツ
キを使用し、被駆動の回転カツタにより鉄筋コン
クリート製品に削孔する方法であつて、前記液圧
ジヤツキの前記押し側液室に圧液を供給し、これ
によつて前記回転カツタおよび前記鉄筋コンクリ
ート製品の一方を他方に向けて押し付け、前記回
転カツタと前記鉄筋コンクリート製品の鉄筋とが
当つて前記回転カツタの回転抵抗が予め設定した
値になつたとき、前記液圧ジヤツキの前記戻し側
液室に圧液を供給し、これによつて前記回転カツ
タと前記鉄筋とを引き離し、前記回転カツタと前
記鉄筋とを引き離した状態に維持し、その後、前
記押し側液室に圧液を供給することを含む。(Means for Solving the Problems) The present invention uses a double-acting hydraulic jack having a push-side liquid chamber and a return-side liquid chamber partitioned by a piston, and a driven rotary cutter. A method for drilling a hole in a reinforced concrete product, the method includes supplying pressure fluid to the pushing side liquid chamber of the hydraulic jack, thereby pushing one of the rotating cutter and the reinforced concrete product toward the other, and When the cutter and the reinforcing steel of the reinforced concrete product come into contact and the rotational resistance of the rotating cutter reaches a preset value, pressure fluid is supplied to the return side liquid chamber of the hydraulic jack, thereby causing the rotation of the cutter. The method includes separating the cutter and the reinforcing bar, maintaining the rotating cutter and the reinforcing bar in a separated state, and then supplying pressurized liquid to the pushing side liquid chamber.
（実施例）
本発明の削孔方法は、ピストンによつて仕切ら
れた押し側液室と戻し側液室とを備える複動型の
液圧ジヤツキを使用し、被駆動の回転カツタによ
り鉄筋コンクリート製品に削孔するものである。(Example) The drilling method of the present invention uses a double-acting hydraulic jack equipped with a push-side liquid chamber and a return-side liquid chamber partitioned by a piston, and uses a driven rotary cutter to drill a reinforced concrete product. The hole is drilled into the hole.
被駆動の回転カツタにより鉄筋コンクリート製
品に削孔するに際し、液圧ジヤツキの押し側液室
に圧液を供給して前記回転カツタおよび鉄筋コン
クリート製品の一方を他方に向けて押し付ける。
この場合の回転カツタの回転速度は一定であり、
第１図に示すように、押し側液室の圧力P1も一
定である。従つて、切削力さらには切削トルクは
一定であり、この切削トルクに基づく回転カツタ
の回転抵抗は一定である。この一定の切削トルク
T1の状態で鉄筋コンクリート製品の削孔が行わ
れる（同図ａ）。 When drilling a hole in a reinforced concrete product using a driven rotary cutter, pressurized fluid is supplied to a push-side liquid chamber of a hydraulic jack to press one of the rotary cutter and the reinforced concrete product toward the other.
In this case, the rotation speed of the rotating cutter is constant,
As shown in FIG. 1, the pressure P 1 in the push side liquid chamber is also constant. Therefore, the cutting force and further the cutting torque are constant, and the rotational resistance of the rotary cutter based on this cutting torque is constant. This constant cutting torque
Drilling of reinforced concrete products is carried out in the state of T 1 (Figure a).
回転カツタが鉄筋に至つて鉄筋に食い込むよう
になると、摩擦抵抗が増大するので、切削トルク
はtT2に増加する。切削トルクの増加は回転カツ
タ駆動装置の回転抵抗の増加をもたらす。この増
加の量が前もつて設定した値に達したとき、液圧
ジヤツキの戻し側液室に圧液を供給する。その結
果、それまでP1であつた押し側液室の圧力はP2
のようにゼロの値となる（同図ｂ）。 When the rotating cutter reaches the reinforcing bar and begins to bite into the reinforcing bar, the frictional resistance increases, so the cutting torque increases to tT 2 . An increase in cutting torque results in an increase in rotational resistance of the rotary cutter drive. When the amount of this increase reaches a preset value, pressure fluid is supplied to the return side fluid chamber of the hydraulic jack. As a result, the pressure in the push-side liquid chamber, which was previously P 1 , becomes P 2
The value becomes zero as shown in (b) of the same figure.
先行削孔法は、摩擦抵抗が増大したとき、押し
付け力を低下するものであつて、具体的には、液
圧ジヤツキの押し側液室に連なる配管にバイパス
管を設け、押し側液室の圧力をバイパス管によつ
て開放している。しかし、この開放によつて押し
側液室の圧力がゼロとなることはなく、押し付け
力は依然として存在する。本発明では、液圧ジヤ
ツキの戻し側液室に圧液を供給した結果、押し側
液室内の圧力がP2のようにゼロとなり、回転カ
ツタおよび鉄筋コンクリート製品の一方を他方へ
向けて押し付ける力はなくなる。そればかりでは
なく、液圧ジヤツキの戻し側液室に圧液を供給す
ることにより、一方を他方から引き離す力が働
く。 The advance drilling method reduces the pushing force when frictional resistance increases. Specifically, a bypass pipe is installed in the piping connected to the pushing side liquid chamber of the hydraulic jack, and the pushing force is reduced when the frictional resistance increases. The pressure is released by a bypass pipe. However, this opening does not cause the pressure in the push-side liquid chamber to become zero, and the pushing force still exists. In the present invention, as a result of supplying pressure fluid to the return side liquid chamber of the hydraulic jack, the pressure in the push side liquid chamber becomes zero as shown in P 2 , and the force pushing one of the rotary cutter and the reinforced concrete product toward the other is It disappears. Not only that, but by supplying pressurized liquid to the return side liquid chamber of the hydraulic jack, a force is exerted that separates one from the other.
回転カツタおよび鉄筋コンクリート製品の一方
を他方から引き離す力が働くと、回転カツタの鉄
への食い込みが解消され、回転カツタと鉄筋とは
離れる。これにより、切削トルクは急激に低下し
て定常の切削トルクT1より低いT3となる。この
ときの切削トルクT3はゼロに近い値である。 When a force is applied to separate one of the rotating cutter and the reinforced concrete product from the other, the cutting of the rotating cutter into the iron is eliminated, and the rotating cutter and the reinforcing bar are separated. As a result, the cutting torque rapidly decreases to T3 , which is lower than the steady cutting torque T1 . The cutting torque T3 at this time is a value close to zero.
回転カツタと鉄筋とを引き離した後、回転カツ
タと鉄筋とを引き離した状態に維持する。これは
切削トルクをT3に保つことである。 After separating the rotating cutter and the reinforcing bar, the rotating cutter and the reinforcing bar are maintained in a separated state. This is to keep the cutting torque at T 3 .
切削トルクをT3に保つた後、液圧ジヤツキの
押し側液室に再び圧液を供給して圧力をP1に戻
す。そうすると、切削トルクは定常の切削トルク
T1に至るものと考えられる。もつとも、たまた
ま回転カツタが鉄筋に食い込むことがあると、切
削トルクは定常の切削トルクより大きいT4のよ
うな値を取ることもある。この切削トルクT4に
なつたとき、回転カツタの駆動が継続されると、
切削トルクはそのままT2まで上昇する外、一旦
T1まで下るなどの態様を取り得る。 After maintaining the cutting torque at T 3 , pressure fluid is again supplied to the push side liquid chamber of the hydraulic jack to return the pressure to P 1 . Then, the cutting torque is the steady cutting torque
This is thought to lead to T 1 . However, if the rotating cutter happens to bite into the reinforcing steel, the cutting torque may take a value such as T 4 , which is larger than the steady cutting torque. When the cutting torque reaches T 4 , if the rotating cutter continues to be driven,
The cutting torque continues to increase up to T 2 , but once
It is possible to take a mode such as descending to T 1 .
再び、定常の切削トルクT1で回転カツタが駆
動されたとき、鉄筋が未だ切断されていないと、
回転カツタは鉄筋に食い込む。そうすると、切削
トルクは再び上昇してT2となり、前記と同じ操
作を繰り返す。鉄筋が切断されると、もはや切削
トルクに変動を及ぼす要因はないので、回転カツ
タは定常の切削トルクT1で駆動される。 Again, when the rotating cutter is driven with a steady cutting torque T 1 , if the reinforcing bar has not yet been cut,
The rotating cutter bites into the reinforcing steel. Then, the cutting torque increases again to T 2 and the same operation as above is repeated. Once the reinforcing steel is cut, there are no longer any factors that affect the cutting torque, so the rotary cutter is driven with a steady cutting torque T1 .
前記したところから明らであるように、本発明
の削孔方法では、任意の削孔時点での回転カツタ
の切削トルクに基づく回転抵抗を定常状態の切削
トルクに基づく回転抵抗に維持するように、液圧
ジヤツキの押し側液室と戻し側液室とに圧液の供
給を行ないつつ、鉄筋を切断するのである。 As is clear from the above, in the drilling method of the present invention, the rotational resistance based on the cutting torque of the rotary cutter at any point in drilling is maintained at the rotational resistance based on the cutting torque in a steady state. The reinforcing steel is cut while supplying pressure fluid to the push-side liquid chamber and the return-side liquid chamber of the hydraulic jack.
前記した本発明の削孔方法は、回転抵抗の増大
を圧力計とか電流計で確認し、液圧ジヤツキへの
圧液の供給を手動操作で切り換えることによつて
も実施できる。しかし、第２図に示すように、自
動操作することが好ましい。 The above-described hole drilling method of the present invention can also be carried out by checking the increase in rotational resistance using a pressure gauge or an ammeter and manually switching the supply of pressure fluid to the hydraulic jack. However, as shown in FIG. 2, automatic operation is preferred.
液圧モータからなる駆動装置１０により、円筒
状その他の回転カツタであつて回転軸線の回りに
削孔可能な回転カツタ１２を回転させながら、液
圧ジヤツキ１４で回転カツタ１２を鉄筋コンクリ
ート製品１６に向けて押し付ける。逆に、鉄筋コ
ンクリート製品１６を回転カツタ１２に向けて押
し付けることもできるが、以下の実施例では、回
転カツタ１２を鉄筋コンクリート製品１６に向け
て押し付ける場合について説明する。 A driving device 10 consisting of a hydraulic motor rotates a rotary cutter 12, which is a cylindrical or other rotary cutter and is capable of drilling holes, around a rotation axis, and a hydraulic jack 14 directs the rotary cutter 12 toward a reinforced concrete product 16. and press it. Conversely, it is also possible to press the reinforced concrete product 16 toward the rotating cutter 12, but in the following embodiment, a case where the rotating cutter 12 is pressed toward the reinforced concrete product 16 will be explained.
電動機１８によつて駆動されるポンプ２０から
の圧液は、中立エンベロープ２１ａ、正転エンベ
ロープ２１ｂおよび逆転エンベロープ２１ｃを有
する切換弁２２を経て駆動装置１０に送られ、回
転カツタ１２を回転する。切換弁２２は手動操作
される。 Pressure fluid from a pump 20 driven by an electric motor 18 is sent to the drive device 10 through a switching valve 22 having a neutral envelope 21a, a forward envelope 21b, and a reverse envelope 21c, and rotates the rotary cutter 12. The switching valve 22 is manually operated.
電動機２４によつて駆動されるポンプ２６から
の圧液は、中立エンベロープ２７ａ、ピストンロ
ツド伸長エンベロープ２７ｂおよびピストンロツ
ド縮小エンベロープ２７ｃを有する切換弁２８を
経て液圧ジヤツキ１４に送られる。 Pressure fluid from a pump 26 driven by an electric motor 24 is delivered to the hydraulic jack 14 via a switching valve 28 having a neutral envelope 27a, a piston rod extension envelope 27b and a piston rod reduction envelope 27c.
切換弁２８は電磁作動弁またはパイロツト圧可
変型パイロツト作動弁であつて、この切換弁２８
が自動操作下におかれた場合、駆動装置１０の作
動回路３０に組み込まれた、回転抵抗の増大を検
知する圧力スイツチのような検知装置３２から検
知信号が出力していないとき、ピストンロツド伸
長エンベロープ２７ｂが連通し、検知装置３２か
ら検知信号が出力しているとき、ピストンロツド
縮小エンベロープ２７ｃが連通する。 The switching valve 28 is an electromagnetically operated valve or a variable pilot pressure type pilot operating valve.
When the piston rod extension envelope is placed under automatic operation, when no detection signal is output from a detection device 32, such as a pressure switch, which is incorporated in the actuation circuit 30 of the drive device 10 and detects an increase in rotational resistance, the piston rod extension envelope 27b is in communication and the detection device 32 is outputting a detection signal, the piston rod reduction envelope 27c is in communication.
検知装置３２から検知信号が出力すると、タイ
マ３４が働き、このタイマ３４に設定した所定の
時間が経過するまで検知信号を出力状態に保つ。
これにより、検知装置３２が検知信号を出力した
後、この信号がすぐになくなるようなことがあつ
ても、切換弁２８の頻繁な切り換えを防止する。 When the detection signal is output from the detection device 32, the timer 34 operates and keeps the detection signal in the output state until a predetermined time set in the timer 34 has elapsed.
This prevents frequent switching of the switching valve 28 even if the detection signal disappears immediately after the detection device 32 outputs the detection signal.
切換弁２２を正転エンベロープ２１ｂに切り換
えると駆動装置１０は回転カツタの回転を始め
る。他方、切換弁２８を自動操作にすると、検知
装置３２から検知信号が出力していないので、切
換弁２８のピストンロツド伸長エンベロープ２７
ｂが連通状態となる。その結果、液圧ジヤツキ１
４の押し側液室１５ａに圧液が供給され、回転カ
ツタ１２を鉄筋コンクリート製品１６に向けて押
し付ける。この場合、回転カツタの回転速度は一
定であり、押し付け力も一定に保たれるので、切
削力従つて、切削トルクは一定である。これは第
１図ａの切削トルクT1の状態である。 When the switching valve 22 is switched to the forward rotation envelope 21b, the drive device 10 starts rotating the rotary cutter. On the other hand, when the switching valve 28 is set to automatic operation, since no detection signal is output from the detection device 32, the piston rod expansion envelope 27 of the switching valve 28
b becomes in communication state. As a result, hydraulic jack 1
Pressure liquid is supplied to the push-side liquid chamber 15a of No. 4, and the rotary cutter 12 is pressed against the reinforced concrete product 16. In this case, the rotational speed of the rotary cutter is constant and the pressing force is also kept constant, so the cutting force and hence the cutting torque are constant. This is the state of cutting torque T 1 in FIG. 1a.
回転カツタ１２が鉄筋に至り、これに食い込む
ようになると、摩擦抵抗が増大するので、切削ト
ルクはT2に増加する。この切削トルクの増加は
回転カツタ１２の駆動装置１０の回転抵抗の増加
をもたらす。その増加の程度が前もつて設定した
設定値に達すると、検知装置３２から検知信号が
出力され、タイマ３４が作動する。同時に、切換
弁２８が切り換えられて、ピストンロツド縮小エ
ンベロープ２７ｃが連通する。その結果、ポンプ
２６から送られた圧液は液圧ジヤツキ１４の戻し
側液室１５ｂに供給され、液圧ジヤツキ１４の押
し側液室１５ａの圧力はP2のようにゼロとなり、
回転カツタ１２は鉄筋コンクリート製品１６から
引き離される。 When the rotary cutter 12 reaches the reinforcing bar and begins to bite into it, the frictional resistance increases, so the cutting torque increases to T2 . This increase in cutting torque results in an increase in rotational resistance of the drive device 10 for the rotary cutter 12. When the degree of increase reaches a preset value, the detection device 32 outputs a detection signal and the timer 34 is activated. At the same time, the switching valve 28 is switched to communicate the piston rod reduction envelope 27c. As a result, the pressure liquid sent from the pump 26 is supplied to the return side liquid chamber 15b of the hydraulic jack 14, and the pressure in the push side liquid chamber 15a of the hydraulic jack 14 becomes zero as indicated by P2 .
The rotating cutter 12 is separated from the reinforced concrete product 16.
液圧ジヤツキ１４の押し側液室１５ａの圧力が
ゼロになり、回転カツタ１２の切削トルクがT3
となると、駆動装置１０の回転抵抗が低下する。
回転抵抗が低下すると、検知装置３２からの信号
の出力はなくなるが、タイマ３４に設定した時間
が経過するまで、液圧ジヤツキ１４の戻し側液室
１５ａに圧液を供給した状態が維持される。タイ
マ３４に設定した時間が経過すると、切換弁２８
はピストンロツド伸長エンベロープ２７ｂに切り
換えられる。以下、同じ操作がなされ、鉄筋コン
クリート製品１６の鉄筋は切断される。 The pressure in the push side liquid chamber 15a of the hydraulic jack 14 becomes zero, and the cutting torque of the rotary cutter 12 becomes T 3
Then, the rotational resistance of the drive device 10 decreases.
When the rotational resistance decreases, the signal is no longer output from the detection device 32, but the state in which pressure fluid is supplied to the return side fluid chamber 15a of the hydraulic jack 14 is maintained until the time set in the timer 34 has elapsed. . When the time set in the timer 34 has elapsed, the switching valve 28
is switched to the piston rod extension envelope 27b. Thereafter, the same operation is performed to cut the reinforcing bars of the reinforced concrete product 16.
（発明の効果）
本発明の削孔方法によれば下記の効果が得られ
る。(Effects of the Invention) According to the drilling method of the present invention, the following effects can be obtained.
回転カツタと鉄筋コンクリート製品の鉄筋とが
当つて回転カツタの回転抵抗が予め設定した値に
なつたとき、液圧ジヤツキの戻し側液室に圧液を
供給することにより、回転カツタと鉄筋とを積極
的に引き離すことができる。 When the rotating cutter and the reinforcing bar of the reinforced concrete product come into contact and the rotational resistance of the rotating cutter reaches a preset value, the rotating cutter and the reinforcing bar are actively moved by supplying pressure fluid to the return side liquid chamber of the hydraulic jack. can be separated from the target.
これにより、回転カツタの鉄筋への食い込みを
確実に防止または解消できる。 Thereby, it is possible to reliably prevent or eliminate the rotary cutter from biting into the reinforcing steel.
また、回転カツタと鉄筋とを円を積極的に引き
離すことにより、回転しているカツタと鉄筋との
相対位置を変えることができる。そのため、その
後再び削孔しようとするとき、回転カツタが、先
に当たつた鉄筋の同じ箇所に当たる可能性は極め
て小さくなる。 Furthermore, by actively separating the circle between the rotating cutter and the reinforcing bar, the relative position between the rotating cutter and the reinforcing bar can be changed. Therefore, when attempting to drill a hole again afterwards, the possibility that the rotating cutter will hit the same spot on the reinforcing bar that it hit earlier becomes extremely small.
さらに、本願発明によれば、回転カツタの回転
抵抗が予め設定した値になつたとき、たとえば回
転カツタが鉄筋に食い込んだとき、回転カツタを
鉄筋から離した状態に維持するので、回転カツタ
が先に当たつた鉄筋の同じ箇所に当たる可能性を
一層小さくすることができる。 Furthermore, according to the present invention, when the rotational resistance of the rotating cutter reaches a preset value, for example, when the rotating cutter bites into the reinforcing steel, the rotating cutter is kept separated from the reinforcing steel, so that the rotating cutter is placed first. It is possible to further reduce the possibility of hitting the same part of the reinforcing bar that was hit.
粘り強い鉄筋をコンクリートと同じように困難
なく切断でき、削孔が極めて容易である。 It can cut tenacious reinforcing bars without difficulty, just like concrete, and drilling holes is extremely easy.
回転カツタが鉄筋に食い込んだとき、回転カツ
タを鉄筋から離した状態に維持するので、機器の
頻繁な作動を抑えることができる。 When the rotating cutter bites into the reinforcing steel, the rotating cutter is kept away from the reinforcing steel, which reduces the frequent operation of the equipment.
第１図は本発明に係る削孔方法の実施に際し
て、切削トルクと液圧シリンダ内の圧力が変化す
る状態を定性的に示すグラフ、第２図は回路図で
ある。
１０：駆動装置、１２：回転カツタ、１４：液
圧シリンダ、１５ａ：押し側液室、１５ｂ：戻し
側液室、１６：鉄筋コンクリート製品、２２，２
８：切換弁、３２：検知装置、３４：タイマ。
FIG. 1 is a graph qualitatively showing how the cutting torque and the pressure inside the hydraulic cylinder change when carrying out the drilling method according to the present invention, and FIG. 2 is a circuit diagram. 10: Drive device, 12: Rotating cutter, 14: Hydraulic cylinder, 15a: Push side liquid chamber, 15b: Return side liquid chamber, 16: Reinforced concrete product, 22,2
8: switching valve, 32: detection device, 34: timer.
Claims (1)
し側液室とを備える複動型の液圧ジヤツキを使用
し、被駆動の回転カツタにより鉄筋コンクリート
製品に削孔する方法であつて、前記液圧ジヤツキ
の前記押し側液室に圧液を供給し、これによつて
前記回転カツタおよび前記鉄筋コンクリート製品
の一方を他方に向けて押し付け、前記回転カツタ
と前記鉄筋コンクリート製品の鉄筋とが当つて前
記回転カツタの回転抵抗が予め設定した値になつ
たとき、前記液圧ジヤツキの前記戻し側液室に圧
液を供給し、これによつて前記回転カツタと前記
鉄筋とを引き離し、前記回転カツタと前記鉄筋と
を引き離した状態に維持し、その後、前記押し側
液室に圧液を供給することを含む、鉄筋コンクリ
ート製品の削孔方法。1. A method for drilling holes in reinforced concrete products with a driven rotary cutter using a double-acting hydraulic jack equipped with a push-side liquid chamber and a return-side liquid chamber separated by a piston, the method comprising: A pressure liquid is supplied to the pushing side liquid chamber of the pressure jack, thereby pushing one of the rotating cutter and the reinforced concrete product toward the other, and the rotating cutter and the reinforcing bar of the reinforced concrete product come into contact with each other, causing the rotation. When the rotational resistance of the cutter reaches a preset value, pressure fluid is supplied to the return side liquid chamber of the hydraulic jack, thereby separating the rotating cutter and the reinforcing bar, and separating the rotating cutter and the reinforcing bar from each other. A method for drilling a hole in a reinforced concrete product, the method comprising maintaining the reinforcing steel in a separated state and then supplying pressurized liquid to the push-side liquid chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4844189A JPH0214108A (en) | 1989-03-02 | 1989-03-02 | Boring method for reinforced concrete product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4844189A JPH0214108A (en) | 1989-03-02 | 1989-03-02 | Boring method for reinforced concrete product |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7500284A Division JPS60219012A (en) | 1984-04-16 | 1984-04-16 | Method of boring reinforced concrete product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0214108A JPH0214108A (en) | 1990-01-18 |
| JPH0457486B2 true JPH0457486B2 (en) | 1992-09-11 |
Family
ID=12803442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4844189A Granted JPH0214108A (en) | 1989-03-02 | 1989-03-02 | Boring method for reinforced concrete product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0214108A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1021353C2 (en) * | 2002-04-26 | 2003-10-28 | Adamas Holding B V | Drilling method, uses control device to process drilling data obtained by repeatedly measuring drilling unit work parameter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102719A (en) * | 1981-12-14 | 1983-06-18 | 長野油機株式会社 | Method and device for boring reinforced concrete product |
-
1989
- 1989-03-02 JP JP4844189A patent/JPH0214108A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102719A (en) * | 1981-12-14 | 1983-06-18 | 長野油機株式会社 | Method and device for boring reinforced concrete product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0214108A (en) | 1990-01-18 |
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