JP3215768U - Impact tools - Google Patents

Abstract

A concrete compaction device capable of efficiently performing good concrete compaction is provided. An impact tool having a function of compacting concrete placed in concrete, wherein the contact tool is in contact with a concrete mold that is assembled and filled with concrete; An output shaft 21 connected to the contact portion 41 and an impact mechanism that applies a rotational impact force around the shaft to the output shaft 21 are provided. The output shaft 21 and the contact portion 41 may be connected via the socket 23, and the contact portion 41 may be detachable from the socket 23. [Selection] Figure 1

Description

  The present invention relates to a concrete compaction method and a concrete compaction device.

  Conventionally, when placing concrete, a concrete formwork is assembled and filled with ready-mixed concrete. In order to eliminate the air contained in the concrete that has not yet been set filled in the formwork, an operation called compaction is performed. For this compaction, a construction method described in Patent Document 1 is known. In this construction method, a plurality of bar-shaped high-frequency vibrators that vibrate concrete are prepared, and are inserted into the concrete to vibrate, thereby transmitting the vibration to surrounding concrete and compacting it by eliminating air.

JP-A-2005-48547

  However, in the construction method described in Patent Document 1 described above, since the reinforcing bars are densely arranged in the placed concrete, it may be difficult to insert the vibrator described above, and good compaction cannot be performed. There is a case. In addition, equipment costs increase due to the need to compact concrete like a vibrator, increasing equipment costs, securing storage locations on site, transporting to sites, etc. This is one of the causes of the increase.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a concrete compaction device capable of efficiently performing good concrete compaction.

  The impact tool according to the present invention is an impact tool having an output shaft that is subjected to a rotational impact around an axis by an impact mechanism, and urges the output shaft to urge the output shaft in the rotational direction even when no rotational impact occurs. It is characterized by having means.

  In the present invention, since the output shaft is urged in the rotational direction even when the rotational direction impact is not generated, the output shaft is restrained from reverse rotation due to the reaction at the time of impact. Shaking caused by the clearance between the output shaft and the socket is also suppressed. Therefore, waste of power can be reduced, and tightening torque measurement for torque control can be performed more accurately.

It is a side view of the impact tool which concerns on embodiment. It is explanatory drawing which shows the concrete placement method using the impact tool which concerns on embodiment. It is a schematic sectional drawing of the impact tool which concerns on embodiment. It is a block diagram of the impact tool which concerns on embodiment. It is a front view which shows the modification of the contact part of the impact tool which concerns on embodiment. It is a front view which shows the other modification of the contact part of the impact tool which concerns on embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same or equivalent parts and components are denoted by the same or equivalent reference numerals. The embodiments described below exemplify devices for embodying the technical idea of the present invention, and the technical idea of the present invention includes the material, shape, structure, The arrangement is not specified as follows. The technical idea of the present invention can be variously modified within the scope of the claims.

(Configuration of impact tool)
As shown in FIGS. 1 to 4, a concrete compaction device (impact tool) 11 is an impact tool having a function of compacting concrete C placed in a concrete mold 101 and assembled. An abutment portion 41 that abuts against a concrete mold 101 filled with concrete C therein, an output shaft 21 connected to the abutment portion 41, and an impact mechanism that applies a rotational impact force around the shaft to the output shaft 21 17.

  The contact portion 41 has a large number of convex portions 41 c with sharp tips on the surface that contacts the concrete mold 101. As shown in FIG. 5, the shape of the contact portion 41 can be a quadrangular shape or a hexagonal shape when viewed from the front. In the present embodiment, the output shaft 21 and the diaphragm 41b are connected via a socket 23 and a shaft 41a which are connecting portions on the surface opposite to the surface on which the convex portion 41c is formed. The shaft 41a of the contact portion 41 is attachable to and detachable from the socket 23, and other attachments such as a screwdriver, a wrench, and a drill can be connected to the socket 23 in place of the contact portion 41. . The contact part 41 and the shaft 41a may be configured integrally, or may be separable via engagement parts 41d and 41e as shown in FIG. Furthermore, the diaphragm 41b may be connected to the shaft 41a or the output shaft 21 so as to be rotatable via a flexible elastic member such as rubber or a wound spring.

  Here, the function and structure of the impact tool 11 itself will be described in detail. The impact tool 11 is usually used with an attachment such as an impact driver, an impact wrench, a drill or the like, and has a cylindrical body with a bottom. 13 and a handle portion 14 extending from the trunk portion constitute a housing 12.

  A motor 15 as a drive source is disposed at a position on the right side in FIG. An impact mechanism 17 is connected to the output shaft 16 of the motor 15 via a speed reduction mechanism 18. The reduction mechanism 18 decelerates the rotation of the motor 15 at a predetermined reduction ratio to obtain a necessary torque. The impact mechanism 17 generates impact force by converting the rotational power of the motor 15 into pulsed torque.

  The impact mechanism 17 includes a drive shaft 22 that is an output portion of the speed reduction mechanism 18, a hammer 19, an anvil 20, and an output shaft 21. The hammer 19 is attached to the drive shaft 22 via a cam mechanism, and is urged toward the output shaft 21 by a spring 24. The anvil 20 includes an engaging portion that engages with the hammer 19 in the rotation direction, and is integrated with the output shaft 21 or fixed to the output shaft 21. A tip tool is attached to the tip of the output shaft 21 via the socket 23 or directly.

  When no load is applied to the output shaft 21, the drive shaft 22 and the hammer 19 rotate integrally by coupling with the cam mechanism, and further, the output shaft 21 rotates integrally by engagement of the hammer 19 and the anvil 20. To do. However, when a load of a predetermined value or more is applied to the output shaft 21, the hammer 19 moves backward against the spring 24 while being restricted by the cam mechanism, and the hammer 19 is moved to the next point where the engagement with the anvil 20 is released. Advancing while rotating, an impact impact in the rotation direction is applied to the anvil 20 to rotate the output shaft 21.

  A battery pack 31 containing a secondary battery is detachably attached to the lower end portion of the handle portion 14. The battery pack 32 is connected to the main body control circuit 30 through the power line 33. The rechargeable impact tool 11 using the battery pack 32 as a driving power source is driven by an operator operating a trigger lever 29 provided in the handle portion 14.

  The motor 15 is provided with a speed detector 34 that detects the rotational speed of the motor 15. The speed detector 34 is a frequency generator, for example, and outputs a signal corresponding to the rotation speed to the main body control circuit 30. The main body control circuit 30 is connected to the motor 15 by the lead wire 35 while the torque measuring unit 26 and the rotation measuring unit 27 are connected by the signal lines 36 and 37, and controls the driving of the motor 15 and the like.

  In addition, a trigger switch that detects the operation of the trigger lever 29 is electrically connected to the main body control circuit 30. When the operator operates the trigger lever 29, control such as changing the rotation speed of the motor 15 in accordance with the pull-in amount of the trigger lever 29 is performed. The main body control circuit 30 that performs rotation control and torque setting of the motor 15 stops the motor 15 when the calculated torque value calculated using the output of the torque measurement unit 26 and the output of the rotation measurement unit 27 exceeds the torque setting value. Let it shut off.

  The torque measuring unit 26 and the rotation measuring unit 27 measure the torque Ts applied to the output shaft 21 and the rotation of the output shaft 21, respectively. The torque measuring unit 26 is, for example, a magnetostrictive strain sensor capable of detecting torsional distortion, and a coil in which a change in permeability according to the distortion of the shaft generated when torque is applied to the output shaft 21 is installed in a non-rotating portion. And output a voltage signal proportional to the distortion. The rotation measuring unit 27 is, for example, a rotary encoder, and outputs the angular position of the output shaft 21 as a digital signal.

  FIG. 4 shows details of the main body control circuit 30. The main body control circuit 30 includes a tightening torque calculation unit 90 and a recording unit 203 that records a torque value at the time of stop, in addition to a control unit 60 that performs torque management and speed control of the motor 15.

  The control unit 60 includes a motor speed measurement unit 62 that measures the motor speed from the output of the speed detection unit 34, a speed limit calculation unit 63, a motor control unit 64, a stop determination unit 66, and a target value of the tightening torque. A torque setting unit 61 for setting the set torque. The target torque for stopping the driving of the motor 15 is set by the operation of the torque setting unit 61 by the operator.

  The motor speed measuring unit 62 measures the rotational speed of the motor 15 based on a signal corresponding to the speed input from the speed detecting unit 34. The speed limit calculating unit 63 receives the measured rotational speed of the motor 15 and the set target torque, and limits the rotational speed of the motor 15 when the trigger lever 29 is pulled according to the magnitude of the target torque. Calculate the speed.

  The motor control unit 64 controls the driving of the motor 15 so as to limit the rotation speed of the motor 15 to be equal to or lower than the limit speed. That is, when the target torque is small, the motor 15 is limited to a speed that does not reach the maximum speed even when the trigger lever 29 is pulled to the maximum.

  The stop determination unit 66 compares the tightening torque calculated by the tightening torque calculation unit 90 with the target torque, and when the tightening torque reaches the target torque, the motor control unit 64 stops the drive current in the motor 15. The impact mechanism 17 is stopped by outputting a stop signal for instructing to stop the motor 15. This calculation control is performed every time the impact mechanism 17 strikes the output shaft 21, and it is determined whether or not the next strike is necessary. Further, the stop determination unit 66 causes the recording unit 203 to record the torque value required for tightening for each work performed by the operator, the time required for tightening, and the like.

  The tightening torque calculation unit 90 receives the shaft torque calculation unit 91 that calculates torque (measurement torque) applied to the output shaft 21 from the output of the torque measurement unit 26 and the signal output from the rotation measurement unit 27 and calculates the rotation angle. And a rotation angle calculation unit 92. In addition, an angular acceleration calculation unit 96 that calculates angular acceleration based on the rotation angle calculated by the rotation angle calculation unit 92, an inertia moment setting unit 95 that inputs an inertia moment around the rotation axis of the socket 23, etc., and a measurement torque And a total torque calculator 94 for calculating a tightening torque based on the angular acceleration and the moment of inertia.

  As the moment of inertia, the moment of inertia itself may be used, or a value corresponding to or proportional to the moment of inertia may be employed. Further, the tightening torque calculation unit 90 of the present embodiment accumulates the waveform for one hit in the measured torque calculated by the shaft torque calculation unit 91 in the buffer unit 93.

(How to use impact tools)
By using the impact tool having the above configuration, the concrete placing method according to the present embodiment can be implemented.

  As shown in FIG. 2, the impact tool 11 is driven so as to press the contact portion 41 against the outer wall portion of the assembled concrete mold 101. A rebar 103 is assembled in the concrete mold 101, and a lower part of the rebar 103 is buried under a partially cast concrete placing surface.

  The impact tool 11 generates vibration when driven, and the generated vibration is transmitted to the wall surface of the mold 101 and the reinforcing bars 103a and 103b. This vibration is further transmitted to the portion of the reinforcing bar 103 buried in the concrete C, and compaction of the surrounding concrete C is realized.

(Effect of device)
According to the impact tool according to the present embodiment described above, there is no need to insert a device such as a vibrator into the concrete even when the reinforcing bars are densely arranged in the placed concrete. Good compaction can be easily performed. Moreover, since the impact tool 11 can exchange the contact part 41 of the front-end | tip with other attachments, such as a driver and a wrench, the apparatus specialized for the purpose of compacting concrete like a vibrator becomes unnecessary, The facility cost can be omitted, and it is not necessary to secure a storage place for such a special device or to transport it to the site, so that the entire construction cost can be reduced. As a result, according to the present embodiment, it is possible to provide a concrete compaction device that can efficiently execute good concrete compaction.

C ... Concrete 11 ... Impact tool 12 ... Housing 13 ... Body 14 ... Handle part 15 ... Motor 16 ... Output shaft 17 ... Impact mechanism 18 ... Deceleration mechanism 19 ... Hammer 23 ... Socket 41 ... Contact part 41a ... Shaft 41b ... Vibration Plate 41c ... convex part 41d ... engaging part 101 ... concrete formwork 101 ... formwork 103 ... rebar 103a, 103b ... rebar

Claims (5)

An impact tool having a function of compacting concrete placed in a concrete formwork,
An abutting portion that is assembled and abutted against a concrete formwork filled with concrete;
An output shaft connected to the contact portion;
An impact tool comprising: an impact mechanism that applies a rotational impact force around the shaft to the output shaft.   The impact tool according to claim 1, wherein the output shaft and the contact portion are connected via a connecting portion, and the contact portion is detachable from the connecting portion.   The impact tool according to claim 2, wherein a screwdriver or a drill can be connected to the connecting portion instead of the contact portion.   The impact tool according to any one of claims 1 to 3, wherein the abutting portion is formed with a large number of convex portions with pointed tips on a surface in contact with the concrete formwork.   The impact tool according to any one of claims 1 to 4, wherein the contact portion is connected to the output shaft so as to be rotatable via an elastic member.