JP2010237042A - Device for manufacturing sample for concrete strength test - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for manufacturing a sample for a concrete strength test applicable to the case using a tamping rod, and to thereby reduce operator's fatigue and homogenize the sample for the concrete strength test. <P>SOLUTION: The device includes a hammer member for hammering the outside surface of a formwork in order to vibrate fresh concrete in the formwork, a base for supporting the hammer member, and further an operation mechanism of the hammer member. The hammer member including a rod-like arm, and hammering part provided on one end of the arm, is supported by the base through a rotation center shaft provided on the arm so that hammering can be performed by a pendulum operation while the hammering part is suspended. The operation mechanism includes a movable member for performing either of a vertical reciprocating operation on the upward side of the formwork and a rotation operation around a vertical shaft, and the reciprocating operation or the rotation operation by the movable member is converted into the pendulum operation, to thereby perform hammering. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a concrete strength test specimen manufacturing apparatus, and more specifically, for example, a concrete strength test specimen is manufactured by a method in accordance with “How to make a concrete strength test specimen” prescribed in JIS A1132. The present invention relates to a specimen manufacturing apparatus for a concrete strength test that is possible.

Conventionally, in “How to make a specimen for concrete strength test” prescribed in JIS A1132, after filling fresh concrete into a formwork, the fresh concrete is compacted or deflated from the fresh concrete. For the purpose, it is prescribed to give vibration to the fresh concrete in the mold.
As a method for applying this vibration, this JIS standard defines a method using an internal vibrator. For example, in Patent Document 1 below, a specimen for bending strength test is prepared using a vibrator. Is described.

In addition, the JIS standard stipulates the case where a fresh stick in a form is pushed a predetermined number of times with a stick from the upper surface side, and the case of using a stick is specified in Annex 1 (reference) of the JIS standard. In the case of “use,” it is defined that after the end of the sticking, the side surface of the formwork is tapped with a mallet so that the hole made by the sticking rod is eliminated.
For example, if the specimen for concrete strength test is a specimen for compressive strength test, the diameter is usually 100 to 150 mmφ, the height is twice that, and the specimen is relatively small. It can be said that the method using a stick is an easy and simple method.
However, when hitting with a mallet, it usually moves the mallet horizontally with the wrist, elbow, or shoulder as a fulcrum, placing a heavy burden on the operator's wrist, elbow, and shoulder, leading to fatigue of the operator. It has the problem of being easy.
In addition, when a large number of concrete strength test specimens are produced, it is difficult to continue a stable impact due to the fatigue, and it may be difficult to produce a homogeneous concrete strength test specimen. Also have.

JP 2007-212348 A

  The present invention has been made in view of the above-described problems, and provides a concrete strength test specimen manufacturing apparatus that can be applied when using this thrust bar. The purpose is to homogenize specimens for concrete strength tests.

  In order to solve the above-mentioned problems, the present invention has a mold frame in which fresh concrete is accommodated and cured in order to form a specimen for concrete strength test, and to vibrate the fresh concrete accommodated in the mold frame. The hammer member further applies a hammer to the outer surface of the mold, a base supporting the hammer member, and an operation mechanism for causing the hammer member to perform the hammer, It has a rod-like arm part and a striking part provided at one end of the arm part, and is provided on the arm part so that the striking can be performed by a pendulum operation in a state where the striking part is suspended. It is supported on the base via a rotation center axis, and the operation mechanism performs either a reciprocating operation up and down or a rotation operation around a vertical axis on the upper side of the mold. A specimen for concrete strength test, comprising a movable member, wherein the striking is performed by converting the reciprocating motion or the pivoting motion by the movable member into the pendulum motion. Providing equipment.

The concrete strength test specimen manufacturing apparatus of the present invention has a movable member that performs a reciprocating operation up and down or a rotating operation in the horizontal direction on the upper side of the mold, and the reciprocating operation, or There is provided an operation mechanism for converting the turning operation into a pendulum operation of the hammer member to perform the hitting of the mold.
The present invention is intended to perform the operation of the movable member by a motor such as a motor or by human power, but in any case, the mold can be hit by an operation on the upper surface side of the mold. it can.

  For example, it employs a movable member that is moved downward by striking from above and then reciprocating back using a repulsive force of a spring or the like. In the case of adopting an action mechanism that converts to a batting, the entire arm can be hit in the vertical direction compared to the case where a horizontal batting with the wrist, elbow or shoulder as a fulcrum is performed on the outer surface of the formwork. Therefore, the load on the wrist, elbow, and shoulder can be reduced, and the worker's fatigue can be reduced.

  Further, in the present invention, a plurality of the hammer members are provided so that the hitting can be performed at a plurality of locations in the circumferential direction of the mold, and the plurality of hammer members can perform the hitting simultaneously. It is preferable to have the operation mechanism that operates the plurality of hammer members at a time.

According to such an aspect, since a plurality of hammer members are provided, for example, in the case of having a movable member that performs the reciprocating operation as described above, the mold is formed with a single hit against the movable member. Will be hit at multiple locations.
Therefore, it is possible to reduce the number of times of hitting until the hole of the thrust bar disappears, and the labor of the operator can be further reduced.

Further, in the present invention, it is preferable that the plurality of hammer members are arranged so that the hit location is in a state of symmetry around the formwork.
According to such an aspect, since the hit | damage location has the symmetry in the circumferential direction of the said formwork, the position shift of the formwork by a hit | damage can be suppressed, and simplification of the effort of alignment etc. can be performed. It can be planned.

The three-plane figure which shows the specimen manufacturing apparatus for concrete strength tests which concerns on 1st embodiment. The front view which shows the mechanism of the specimen manufacturing apparatus for concrete strength tests of the embodiment. The top view which shows the example of a change of an impact position. The front view which shows the aspect used combining the test body manufacturing apparatus for different concrete strength tests. The front view and partial top view which show the specimen manufacturing apparatus for concrete strength tests which concern on 2nd embodiment.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings, taking as an example the case of use in the production of a specimen for compressive strength test prescribed in JIS A1132.
1 is a three-side view ((a) front view, (b) top view, and (c) side view) of a concrete strength test specimen manufacturing apparatus (hereinafter also simply referred to as “manufacturing apparatus”) according to the present embodiment. FIG. 2 is a front view showing how a concrete strength test specimen (hereinafter also simply referred to as “specimen”) is produced using the manufacturing apparatus shown in FIG. 1.

(First embodiment)
As shown in FIGS. 1 and 2, the manufacturing apparatus 1 according to the present embodiment has the above-described columnar shape inside to form a concrete strength test specimen by curing the fresh concrete A in a columnar shape. It has a mold 10 provided with a storage space, and has a hammer member 20 for striking the mold 10 from the outside and applying vibration to the fresh concrete.
More specifically, the mold 10 has a cylindrical shape, and two hammer members 20 are provided so that the mold 10 arranged in a vertically placed state can be hit from the outside at two opposing positions. It has been.
And the manufacturing apparatus 1 of this embodiment is further provided with the base 30 which supports the said some hammer member 20 in the state which can be rotated in a pendulum shape, The said hammer supported by this base 30 An operation mechanism 40 is further provided to allow the member 20 to perform a pendulum operation at a time to strike the formwork 10.

The base 30 includes a flat board portion 31 that is substantially rectangular when viewed from above, and four base portions extending downward from the four corners of the substrate portion 31 in order to support the substrate portion 31 at a position higher than the mold 10. Are formed in a table shape.
The base 30 has a projecting piece 33 that rises upward from the upper surface of the substrate portion 31 at a location corresponding to the central portion on the short side of the two opposing two sides of the rectangle. .
Two protrusions 33 are formed on each side of the base 30, and the protrusions 33 on each side are erected with a slight gap, and the protrusions 33 in the gaps The substrate portion 31 is formed with a cutout portion having an outer edge cut inward.

The hammer member 20 has a square bar-shaped arm portion 21 and a columnar, prismatic, or spherical striking portion 22 provided at one end of the arm portion 21, and the arm portion 21 is connected to the protruding piece 33. The arm portion 21 is supported by the base 30 in a rotatable state so that the arm portion 21 extends in the vertical direction in a natural state.
More specifically, the base 30 is pivotable via a pivot center axis C passing through the two projecting pieces 33 and the arm portion 21 therebetween, with the striking portion 22 positioned on the lower end side. The pendulum is supported so that it can be operated.
Further, the hammer member 20 in the present embodiment extends from the upper end portion of the arm portion 21 located above the rotation center axis C so as to be bent at a substantially right angle and extend to the center of the substrate portion 31. A portion 23 is formed, and the two hammer members 20 are supported by the base 30 in a state where the extending portions 23 face each other.

In the manufacturing apparatus according to the present embodiment, the extending portions 23 are spaced apart from each other, and the operation mechanism 40 includes a movable member 41 that reciprocates up and down between the extending portions 23. Yes.
The movable member 41 includes an inverted truncated cone-shaped enlarged diameter portion 41a that expands upward, and a cylindrical portion 41b that extends downward from the lower end of the expanded diameter portion 41a. It is supported from below by a cylindrical receptacle 42 provided in the center and a spring (not shown) accommodated in the receptacle 42.
Further, the diameter-expanded portion 41a of the movable member 41 is formed such that the lowest diameter lower end portion is smaller in diameter than the distance between the extended portions 23 of the two hammer members 20 shown above. A portion having the same diameter as the distance between the two extending portions 23 is formed between the upper end portion having the largest diameter.

The cylindrical portion 41b has a cylindrical shape having the same diameter as the lower end portion of the enlarged diameter portion 41a, and the receiver 42 has a cylindrical shape whose inner diameter is slightly larger than that of the cylindrical portion 41b. And has a mechanism for adjusting the depth of entry of the cylindrical portion 41b.
That is, the movable member 41 is supported by causing the cylindrical portion 41b to enter the receiver 42 from above, and when the movable member 41 is pressed from above, the movable member 41 is contracted downward while contracting an internal spring. It is supported to be pushed back to its original position by the restoring force of the spring by releasing the pressure.

  And as shown above, the said enlarged diameter part 41a is that the lower end part is smaller in diameter than the distance between the said extension parts 23, and the upper end part is smaller than the distance between the said extension parts 23. Since the diameter is large, the movable member 41 interferes with the extending portion 23 in the reciprocating motion in the vertical direction.

This will be described in more detail with reference to FIG. 2. When the movable member 41 is moved downward, both the extending portions 23 are brought into contact with the side surface of the enlarged diameter portion 41a. Further, when the movable member 41 is moved downward while spreading the extending portion 23 outward, the hammer member 20 is rotated via the rotation center axis C, and FIG. As shown in FIG. 2, the hitting portion 22 is caused to collide with the outer surface of the mold 10 placed vertically in the central portion of the base 30.
Therefore, for example, when a hammer is applied to the upper end portion of the movable member 41 in the vertical direction, the vertical reciprocation of the movable member 41 causes the side surface of the enlarged diameter portion 41a and the extending portion 23 to move. By the interference, the pendulum action of the hammer member 20 is changed, and the form 10 is hit from both the left and right sides when viewed from the front of FIG. 2, and vibration is applied to the fresh concrete FC accommodated in the form 10. Will be.

In addition, since the two hammer members 20 arranged in a state that opposes the left and right act as a pendulum at the same time and strikes the mold 10 at the same time, a single blow on the movable member 41 causes two hits on the mold 10. By changing the number of vibration occurrence points to the fresh concrete FC, for example, the holes formed by the stab will disappear more quickly, and the specimen will be produced efficiently. can do.
Also, at this time, since the batting operation with a mallet or the like becomes the batting operation in the vertical direction, the conventional “when using a stick” method of hitting the formwork from the outside with the wrist, elbow, or shoulder as a fulcrum As a result, the burden on the operator can be reduced.

  Furthermore, in the conventional method, since the formwork was struck from the outside by the mallet, there was a case in which the formwork moved depending on the strength of the hitting. Since the impact is applied, the risk of displacement of the mold 10 due to the impact is suppressed, and the risk of alignment is also suppressed.

In addition, about the simplification of such alignment work, for example, as shown in FIG. 3, if the entire hitting location has symmetry in the circumferential direction of the mold, it is illustrated in FIG. 1 and FIG. It can be said that this is the same effect as that of the manufacturing apparatus.
FIG. 3 is a top view of the mold 10 and shows that a hit is applied in the direction of the arrow in the figure. FIG. 3 (a) to FIG. FIG. 2 shows a case where a blow is applied to the mold so as to be opposed from the left and right in the same manner as the manufacturing apparatus illustrated in FIG.
That is, as shown in FIG. 3 (a), the case shown in (b) has a rotational symmetry that is two-fold symmetrical in the circumferential direction, or has a rotational symmetry that is three-fold symmetrical in the circumferential direction (c). In such a case, the manufacturing apparatus 1 illustrated in FIGS. 1 and 2 is the same as that shown in FIGS. 1 and 2 in that a plurality of strikes can be performed at one time while suppressing the displacement of the formwork.

In addition, in the above, since the case where the specimen for compressive strength test is produced is illustrated, a manufacturing apparatus having a cylindrical formwork is illustrated. For example, a specimen for bending strength test is produced. If it is a case, the manufacturing apparatus of a specimen can be comprised similarly to said 1st embodiment by employ | adopting a square tube-shaped formwork.
In that case, it is also possible to provide a striking spot having a four-fold rotational symmetry as shown in FIG.

Moreover, in this embodiment, although the case where the movable member 41 which reciprocates up and down has the reverse frustoconical shape enlarged diameter part 41a is illustrated, the side surface becomes a taper shape which spreads outward toward the upper side. If it is, the same kind of effect can be obtained by the movable members having various shapes regardless of the inverted truncated cone shape.
That is, the rotation center axis C is positioned between the lower end portion and the upper end portion of the arm portion 21, and the plurality of hammer members 20 should position the upper end portion of the arm portion 21 above the mold frame 10. A movable member 41 that is formed and has an extending portion 23 that extends from the upper end portion of the arm portion 21 toward the center of the mold 10, and that reciprocates, is disposed in front of the extending portion 23 and moves downward. The side surface of the hammer member 20 has a shape capable of coming into contact with the extending portions 23 of all the hammer members 20, and is formed so as to be further movable downward from the corresponding contact state. As long as the extension part 23 is moved to the outside by the movement and the plurality of hammer members 20 can perform the pendulum operation at once, the side surface is formed in a tapered shape that spreads outward upward. The above example It is possible to obtain the effect of the same type and function in the same manner as the forming device 1.

Normally, when preparing specimens in accordance with the method for preparing concrete strength test specimens stipulated in JIS A1132, the specimens are driven into the mold several times, and each time the projecting work Since the work of striking the formwork is performed until the hole of the rod disappears, for example, it is possible to use two manufacturing apparatuses having different striking positions as shown in FIG.
That is, as shown in FIG. 4A, the arm portion 21 from the rotation center axis C to the striking portion 22 is long (the striking portion 22 is low in position), and the apparatus 1 ′ for driving the lower layer, FIG. As shown in (b), the length of the arm portion 21 from the rotation center axis C to the striking portion 22 is shorter than the lower striking device 1 ′ (the striking portion 22 is higher in position). "May be prepared and used separately for each driving.
Alternatively, a single device capable of adjusting the striking location on the mold by changing the position of the striking portion 22 relative to the arm portion 21 or the position of supporting the arm portion 21 via the rotation center axis C is used for lower layer driving. It can also be used for both upper and lower layer driving.

Although not described in detail here, the device for manufacturing a specimen in the first embodiment can be configured using a general structural material such as wood or a metal material.
In addition, fresh concrete for producing a specimen can be constituted by generally used components, and as the components, usually cement, coarse aggregate, fine aggregate, water and the like can be mentioned.

Portland cement such as normal, early strong, moderate heat, low heat Portland cement, white cement, alumina cement, and eco-cement using waste such as municipal waste incineration ash / sewage sludge incineration ash as raw materials Is mentioned.
Moreover, what added inorganic powders, such as blast furnace slag powder, fly ash, limestone powder, silica stone powder, and silica fume, to these cements can also be used.

Examples of the coarse aggregate include gravel having a particle diameter of about 5 to 25 mm, crushed stone, a mixture thereof, and lightweight aggregate.
Examples of the fine aggregate include river sand, sea sand, mountain sand, crushed sand, or a mixture thereof.
And the content rate of the fine aggregate in all the aggregates is about 30-60 volume% normally.
In addition, about water, the quantity can be adjusted suitably based on water cement ratio etc., and it can be made to contain in fresh concrete.

  Also, for fresh concrete, concrete admixtures such as lignin, naphthalene sulfonic acid, melamine, polycarboxylic acid, etc., AE water reducing agent, high performance AE water reducing agent, glass fiber, Inorganic fibers such as rock wool and asbestos, synthetic fibers such as vinylon, nylon and acrylic, and various fibers such as steel fibers can be contained.

  This fresh concrete can be obtained by putting the above components into a conventional forced kneading mixer or the like and kneading them. By hitting with the hammer member until there is no hole due to, and hardening for a predetermined time, it can be used for the manufacture of the specimen.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 (a) corresponds to FIG. 1 (a) relating to the manufacturing apparatus of the first embodiment, and is a front view of the manufacturing apparatus according to the present embodiment, and FIG. 5 (b) is FIG. 5 (a). It is the partial top view which looked at the location of the broken line A in FIG.

As shown in FIG. 5, the manufacturing apparatus 1 in the first embodiment and the manufacturing apparatus 1 x in the present embodiment are different from each other in terms of the movable member.
That is, as the manufacturing apparatus 1 in the first embodiment, the operating mechanism 40 has the movable member 41 that reciprocates in the vertical direction, but the operating mechanism 40x of the present embodiment has a vertical axis ( A disc-shaped movable member 41x that rotates in the horizontal direction, a motor 42 that rotates the movable member 41x, and a connecting member 43 that connects the movable member 41x and the extending portion 23 of the hammer member 20. And are provided.

In this manufacturing apparatus 1x, as shown in FIG. 5 (b), the motor 42 is provided so that its rotating shaft is directed vertically upward, and the movable member 41x is fixed to the rotating shaft. Has been.
More specifically, the rotating shaft of the motor 42 is fixed to the movable member 41x in a state of passing through the central portion of the movable member 41x whose plane direction is substantially horizontal, and in the direction of the arrow R in the drawing. By rotating the movable member 41x, the extending portion 23 is drawn toward the center of the mold 10 through the connecting member 43, and extended through the connecting member 43 by rotating in the direction opposite to the arrow R. It operates to spread the part 23 outward.
That is, the movable member 41x provided in the operation mechanism 40x is configured so that the turning operation around the vertical axis is converted into the pendulum operation of the hammer member 20 to hit the mold 10.
The specimen manufacturing apparatus 1x shown in FIG. 5 is automated by adopting a motor 42, and can be effectively used to reduce the labor of a specimen preparation worker.

Except for the difference in the operation mechanism, the manufacturing apparatus 1x of the second embodiment can be configured in the same manner as the manufacturing apparatus 1 of the first embodiment. The change can be applied to the manufacturing apparatus 1x of the second embodiment, and the same effects as the manufacturing apparatus 1 of the first embodiment are obtained in that various effects described in the first embodiment can be obtained. .
In addition, the manufacturing apparatus according to the first embodiment and the second embodiment is illustrated with a specific example because it has an excellent point that the structure is simple and can be handled easily. The present invention is not limited to these embodiments, and various types of manufacturing apparatuses can be employed.

  The present invention is mainly directed to a concrete strength test specimen manufacturing apparatus used for producing a concrete strength test specimen defined in JIS A1132, but is not limited to this JIS standard, for example, the JIS standard. In the same manner as the above, the present invention can be widely used in the production of concrete strength test specimens that are required to strike the formwork from the outside and apply vibration to the fresh concrete inside. Is in range.

DESCRIPTION OF SYMBOLS 1 Concrete strength test specimen manufacturing apparatus 1x Concrete strength test specimen manufacturing apparatus 10 Formwork 20 Hammer member 21 Arm part 22 Strike part 23 Extension part 30 Base 40 Operation mechanism 40x Operation mechanism 41 Movable member 41x Movable member 42 Motor 43 connecting material C rotation center axis FC fresh concrete

Claims (5)

  A hammer which has a formwork in which fresh concrete is received and hardened to form a concrete strength test specimen, and which strikes the outer surface of the formwork to vibrate the fresh concrete contained in the formwork A hammer, a base that supports the hammer member, and an operation mechanism for causing the hammer member to perform the hitting, wherein the hammer member includes a rod-shaped arm portion and one end portion of the arm portion. And a striking portion provided on the arm via a pivot center shaft provided on the arm portion so that the striking can be performed by a pendulum operation in a state where the striking portion is suspended. The moving mechanism is provided with a movable member that performs either a reciprocating motion up and down or a rotating motion around a vertical axis on the upper side of the mold, The reciprocating operation by the movement member, or the rotational operation concrete strength test specimen manufacturing apparatus characterized by the striking is carried out by being converted to the pendulum action.   The plurality of hammer members are provided so that the hitting can be performed at a plurality of locations in the circumferential direction of the mold, and the plurality of hammer members are provided so that the plurality of hammer members can perform the hitting simultaneously. The specimen manufacturing apparatus for concrete strength test according to claim 1, comprising the operation mechanism that operates at a time.   The specimen manufacturing apparatus for concrete strength test according to claim 2, wherein the plurality of hammer members are arranged so that the hit location is in a state of symmetry around the formwork.   The rotation center axis is located between a lower end portion and an upper end portion of the arm portion, and the plurality of hammer members are formed so that the upper end portion of the arm portion is positioned above the mold. And an extending portion extending from the upper end portion of the arm portion toward the center of the mold, and the movable member that performs the reciprocating operation is disposed in front of the extending portion and is side surface thereof when moved downward. Is formed so as to be able to move further downward from the corresponding contact state, and the extension by the downward movement. 4. The concrete according to claim 2, wherein the side surface is formed in a tapered shape so that the plurality of hammer members can perform the pendulum action at a time by moving the portion outward. For strength test Specimen manufacturing equipment.   The rotation center axis is located between a lower end portion and an upper end portion of the arm portion, and the plurality of hammer members are formed so that the upper end portion of the arm portion is positioned above the mold. And an extending portion extending from the upper end portion of the arm portion toward the center of the mold, and the movable member that performs the rotating operation is disposed in front of the extending portion and rotates in one direction. The upper end of the arm portion can be moved closer to the center of the formwork during the movement, and the hammer member can perform the pendulum action by moving away from the center in the rotation in the direction opposite to the one direction. The specimen manufacturing apparatus for concrete strength test according to claim 2 or 3, wherein the specimen is connected to the extending portion.

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