JP2000061922A - Opening-closing device of concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To open and close side plates of a form simply, to execute a smooth shift from form opening to form closing, thereby preventing application of impact on the side plates. SOLUTION: A form 1 is constituted of a bottom plate 2 and side plates 3 fitted pivotally to the peripheral edge of the bottom plate 2 and an outer frame 10 surrounding the side plates 3 is provided upright outside the side plates 3. Rotating shafts 11 having eccentric cams 14 are supported axially by the outer frame 10 respectively and, by rotating one of the rotating shafts 11, the rotating shafts 11 are rotated all together by bevel gears provided at the opposite ends of each rotating shaft 11. By engagement of the eccentric cams 14 with engaging holes 15 formed in support plates 13 of the side plates 3, each side plate 3 is moved outside and thereby the form 1 can be opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete form opening device for forming a slope protection block which is constructed on a slope of a river or a mountain to protect a slope, a block for seawall protection, and the like.

[0002]

2. Description of the Related Art Conventionally, a concrete formwork for molding a slope protection block, a coastal revetment block, etc. has a bottom plate,
The bottom plate is composed of a side plate pivotally attached to the periphery of the bottom plate. When the concrete formwork is clamped, the side plates are erected and adjacent side plates are connected by a fixing means such as a clamp to form a mold having a predetermined shape. Then, concrete is placed inside the mold, and after the concrete is hardened, the tightening means for connecting the side plates is released to open the side plates and remove the mold.

In such concrete formwork,
When forming a block, it is necessary to open and close the heavy side plates, but conventionally, opening and closing of the side plates in this type of concrete formwork has been manually operated. For this reason, not only is it necessary to stand up each heavy side plate when clamping the mold, but since each standing side plate is fixed by a clamp, the work of doing work is difficult as it involves the work of attaching and detaching the clamp as the mold is opened and closed. It was inferior.

Therefore, in order to solve such a problem, the applicant of the present application constructed such that, when the hardened concrete block is lifted by a crane after molding, the mold is opened in association with the lifting operation of the concrete block. Japanese Patent Application No. 8-292079 for a mold opening device for concrete formwork
It is submitted in the issue. This mold opening device for a concrete block has guide columns for vertically holding side plates at the four corners of a bottom plate.The guide columns are formed on the guide columns, and guide grooves are formed in the guide columns. Is provided, the side plate is raised in association with the lifting operation of the concrete block, and the side plate is opened by the engagement of the guide pin provided on the side plate and the guide groove provided on the guide strut.

According to this mold opening device for a concrete formwork, the side plate of the concrete formwork automatically rotates in the mold opening direction at the time of demolding, and at the time of demolding, as the side plate is separated from the block. The side plate is dropped, and the side plate is clamped by the engagement of the guide pin formed on the side plate and the guide groove of the guide strut in conjunction with the lowering operation of the side plate. For this reason, it is possible to save labor for opening and closing the mold, and it is not necessary to clamp the side plate with a clamp or the like, which is efficient in terms of work. However, in this mold opening device for concrete formwork, after the concrete block that is the product is molded, the side plate separated from the concrete block freely falls, so that the side plate is impacted by the fall. For this reason, impact force due to repeated falling is applied to the side plate during molding of the block, which may cause deformation of the side plate.

The present invention is intended to solve such a problem, and saves labor for opening and closing the side plate and reduces labor required for opening and closing the side plate, and at the same time, it is possible to form the frame without impacting the side plate. An object of the present invention is to provide a mold opening device for a concrete formwork that can smoothly shift from mold opening to mold closing.

[0007]

According to a first aspect of the present invention, there is provided a concrete formwork having a bottom plate and a plurality of side plates standing upright on a peripheral portion of the bottom plate, and the concrete form is pivotally supported outside each of the side plates. Rotating shafts, transmission means for connecting the rotating shafts and transmitting the rotation of each rotating shaft, an eccentric cam fixed coaxially to each rotating shaft, and an eccentric cam provided on the side plate. An engaging receiving portion that engages, the rotating shafts are simultaneously rotated by the transmitting means, and the side plates are opened and closed by rotation of the eccentric cams fixed to the rotating shafts. is there.

With the above structure, when the rotating shaft is rotated, the eccentric cam fixed to the rotating shaft rotates together with the rotating shaft. With the rotation of the eccentric cam, the side plates are separated from the bottom plate by the engagement between the eccentric cam and the engaging holes, and the mold is opened. If the rotating shaft is rotated in the opposite direction, the mold is brought into contact with the bottom plate by the eccentric cam and the mold is clamped. Since the side plates are opened / closed by the rotation of the eccentric cam in this manner, the transition from the mold opening to the mold clamping is smoothly performed without applying an impact to each side plate.

According to a second aspect of the present invention, in a concrete formwork including a bottom plate and a plurality of side plates pivotally attached to a peripheral portion of the bottom plate, an outer frame is erected on the outer side of each side plate, and the outer frame is provided. And each of the side plates are connected by a pair of link arms, and the upper end of the crank lever is pivotally attached to the pivotal attachment portion of each link arm, and the crank lever is moved up and down on the lower end side of the crank lever. Elevating means for opening and closing the side plate is provided.

With the above-described structure, the lifting / lowering body is lowered to move the pivotally mounted portion of each link arm downward by the crank lever pivotally mounted on the lifting / lowering body. As a result, the link arm connecting the side plate and the outer frame is pulled, each side plate is rotated outward, and the form is opened. On the other hand, when the elevating body is raised, the link arm connecting the side plate and the outer frame is pushed, each side plate is rotated inward, and the form is closed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the concrete formwork of the present invention will be described below with reference to FIGS. In the figure, the mold 1 for molding concrete is
Bottom plate 2 and four side plates 3 pivotally attached to the periphery of the bottom plate 2.
And a base 4 on which the bottom plate 2 is placed.
A plurality of projecting pieces 6 for fixing the pivot shafts 5 are vertically provided at a lower end of the side plate 3 at intervals, while a plurality of receiving pieces 7 projecting outward are provided on a side part of the bottom plate 2. Are fixed at intervals, and the receiving piece 7 is formed with an elongated hole 8 for rotatably supporting the pivot shaft 5. The elongated hole 8 is inclined obliquely upward, and by pivotally attaching the pivot shaft 5 to the elongated hole 8, the pivot shaft 5 slides obliquely upward along the elongated hole 8.

Reference numeral 10 denotes an outer frame which is provided upright on the peripheral edge of the base 4 corresponding to the side plates 3, and a pair of arms for pivotally supporting both ends of the rotary shaft 11 on both inner surfaces of the outer frame 10. While being fixed to the piece 12, a receiving plate 13 through which the rotary shaft 11 penetrates is fixed to the outer surface of each side plate 3. In addition, the rotary shaft 11,
The eccentric cam 14 is integrally fixed, and an engaging hole 15 serving as an engaging means of the eccentric cam 14 is formed in the receiving plate 13. The eccentric cam 14 and the engagement hole that engages with the eccentric cam 14.
Each of the 15 has a circular shape, but the engagement hole 15 is formed to have a diameter larger than that of the eccentric cam 14. Further, bevel gears 18 serving as transmission means are fixed to both ends of each of the rotary shafts 11, respectively, and the bevel gears 18 provided on the adjacent rotary shafts 11 are meshed with each other to transmit the rotation of the rotary shafts 11. Is configured as follows. A handle 19 is integrally fixed to one of the four rotary shafts 11, the rotary shaft 11 is manually rotated by the handle 19, and the rotary shaft 11 is rotated by the umbrella. Transmission to the other rotary shafts 11 by the gear 18 causes the rotary shafts 11 to rotate in unison. Further, a stopper shaft 20 orthogonal to the rotating shaft 11 is fixed to each rotating shaft 11, and an abutting portion 21 that abuts the stopper shaft 20 is fixed to the inner surface side of the outer frame 10. on the other hand,
A holder 22 that holds the handle 19 by contacting the handle 19 is provided on the side surface of the outer frame 10.
It rotates between the abutting portion 21 and the holder 22, and the rotating range of the handle 19 is regulated to approximately 90 degrees by the abutting portion 21 and the holder 22.

Next, the operation of this embodiment having the above structure will be described. First, as shown by the solid line in FIG. 3, when the mold 1 is clamped, the stopper shafts protruding from the rotary shafts 11 are provided.
The abutting member 20 contacts the abutting portion 21 of the outer frame 10 and is held in a horizontal state. At this time, the centers of the rotary shaft 11, the eccentric cam 14, and the engagement hole 15 are aligned on a straight line along the axis of the stopper shaft 20, as shown in FIG. In the mold clamped state of the frame 1, concrete is filled in the space surrounded by the bottom plate 2 and the side plates 3 to form a block (not shown). Then, after the concrete filled in the mold 1 is hardened, the mold 1 is opened.
In this mold opening, the handle 19 manually fixed to the rotating shaft 11 is rotated downward to rotate the rotating shaft 11. The rotation of the rotary shaft 11 is transmitted to the other rotary shafts 11 by the bevel gear 18, and thereby all the rotary shafts 11 pivotally supported by the outer frame 10 rotate at the same time. The rotation of the rotating shaft 11 causes the eccentric cam 14 to rotate. In addition, each rotating shaft 11 is a handle
Rotate until 19 comes into contact with the holder 22 attached to the outer frame 10, and with the handle 19 in contact with the holder 22, the handle 19
By holding the holder 22 in the holder 22, the rotary shafts 11 rotate 90 degrees, and the rotation of the rotary shafts 11 is restricted. This allows
An eccentric cam 14 fixed to each rotary shaft 11 is attached to each rotary shaft 11 together with 9
The side plates 3 are rotated 0 degrees, and the side plates 3 are obliquely moved upward by the engagement of the eccentric cams 14 and the engagement holes 15 formed in the side plates 3. At this time, the pivot shaft 5 of the side plate 3 slides obliquely upward along the elongated hole 8 formed in the receiving piece 7 of the bottom plate 2. As a result, as shown by the chain line in FIG. 3, the side plates 3 move diagonally upward and separate from the bottom plate 2, and the concrete block molded by the mold 1 is removed from the mold. After that, by rotating the handle 19 to the initial upper side, the side plate 4 of the formwork 1 is rotated.
Due to the engagement of the eccentric cam 14 and the engagement hole 15, the mold moves in a slanting downward direction and comes into contact with the bottom plate 2 to be in a mold clamping state.

As described above, in this embodiment, when the rotating shaft 11 is rotated by the handle 19, the eccentric cam 14 fixed to the rotating shaft 11 is rotated integrally with the rotating shaft 11, and the eccentric cam 14 and the side plate are rotated. By engaging with the engagement hole 15 formed in 4,
Each side plate 4 can be opened and closed. Therefore, the mold 1 is rotated by a rotary shaft without performing the troublesome opening and closing work such as manually opening and closing the four side plates 3 to open and close the mold 1.
It can be opened and closed in conjunction with the rotation of 11. Further, in the mold clamping state of the mold 1, the pressing force P toward the outside is applied to each side plate 3 by the pressure of the concrete filled in the mold 1 as shown in FIG. 3, but is fixed to the rotating shaft 11. The stopper shaft 20 abuts on the abutting portion 21 formed on the outer frame 10, and the outer end portion of the stopper shaft 20 abuts on the outer frame 10 to be held in a horizontal state, and each rotary shaft 11 and the eccentric cam Since the respective centers of 14 and the engaging hole 15 are located on a straight line along the axis of the stopper shaft 20 which is held horizontally, the pressing force P applied to each side plate 3 is applied to the side plate 3 via the stopper shaft 20. Abutment
Since the pressing force P is applied to the side plates 21, the side plates 3 do not open. As a result, it is not necessary to fix each side plate 3 by a tightening means such as a clamp, so that it is possible to save the labor of opening and closing the formwork 1 and to reduce the labor involved in the opening and closing work. Further, when the mold 1 is opened, the eccentric cam 14 that engages with the engaging hole 15 of each side plate 3 by the rotating shaft 11 pivotally supported by the outer frame 1.
Since the side plates 3 are moved in parallel to the diagonally upper side by rotating, the eccentric cams 14 rotate without impact on each side plate 3 to smoothly shift from the mold opening to the mold clamping time. It is possible to prevent deformation of each side plate 3 and enhance the durability of the formwork 1.

4 to 6 show a second embodiment of the present invention,
The parts having the same functions as those in the first embodiment are designated by the same reference numerals, the description of the overlapping parts will be omitted, and only different parts will be described. Although the first embodiment has shown an example in which four side plates 3 are pivotally attached to the peripheral edge of the bottom plate 2 and the rotary shaft 11 for opening and closing the side plates 3 is horizontally supported, the outer frame is used in this embodiment. Ten
A pair of upper and lower receiving parts 31 are horizontally projected from the
A pair of left and right rotating shafts 30 are vertically supported between the two. In addition, the outer frame 10 has a rotary shaft 30 corresponding to the rotary shaft 30.
A pair of driven shafts 33 connected by 30 and a belt 32 are rotatably supported, and each of the driven shafts 32 has a belt 32A.
Are linked by. That is, in this embodiment, each belt 32, 32A constitutes a transmission means so that all the rotary shafts 11 pivotally supported on the outer frame 10 are rotated at the same time. Further, the eccentric cams 14 similar to those of the first embodiment are coaxially fixed near the upper and lower ends of each rotary shaft 30, while the engaging holes 15 of the eccentric cams 14 are provided from the upper and lower ends of the side plate 11. The receiving plate 13 having the is fixed integrally. In the first embodiment, the engaging hole 15 of the side plate 11 is formed to have a diameter larger than that of the eccentric cam 14. However, in the present embodiment, the eccentric cam 14 is fitted into the engaging hole 15, and thus, Each side plate 3 is supported and supported by two rotary shafts 30 which are pivotally supported by the outer frame 10.

In this embodiment constructed as described above, the handle 19 fixed to the rotary shaft 11 is manually rotated in the horizontal direction to rotate the rotary shaft 11. The rotation of the rotary shaft 11 is transmitted to the other rotary shafts 11 by the belts 32 and 32A, so that all the rotary shafts 11 pivotally supported by the outer frame 10 are simultaneously rotated as in the first embodiment. The eccentric cam 14 fixed to each rotating shaft 11 rotates integrally with each rotating shaft 11. Then, by rotating the rotary shafts 11 by 90 degrees in the horizontal direction, the eccentric cams 14 engage with the engagement holes 15 formed in the side plates 3, so that the side plates 3 move from the bottom plate 2 to each other as shown in FIG. The form 1 is opened by moving horizontally so as to be separated. Further, when the rotary shaft 11 is rotated in the opposite direction, the side plate 4 of the mold 1 is horizontally moved to the bottom plate 2 side by the engagement between the eccentric cam 14 and the engagement hole 15, and the bottom plate 2 is moved.
And the mold is clamped.

As described above, in this embodiment, the eccentric cam 14 fixed to the rotary shaft 11 is horizontally rotated by the handle 19, and the eccentric cam 14 is engaged with the engaging hole 15 formed in the side plate 4. The side plates 4 can be opened and closed. Therefore, similar to the first embodiment, the mold 1 is opened and closed by interlocking with the rotation of the rotary shaft 11 without performing the troublesome work of manually undulating the four side plates 3 to open and close the mold 1. In addition, since each side plate 3 can be smoothly moved from mold opening to mold clamping without impact on each side plate 3, deformation of each side plate 3 can be prevented.

FIGS. 7 and 8 show a third embodiment of the present invention, in which parts having the same functions as those of the above-mentioned embodiments are designated by the same reference numerals, and the description of the overlapping parts is omitted and only different parts are described. To do. In this embodiment, the side plate 4 is pivotally attached to the peripheral edge of the bottom plate 2 by the pivot shaft 5, and the side plate 4 and the outer frame 10 are connected.
A pair of left and right are connected by link arms 40 and 41. A crank lever 45 is pivotally attached to a pivoting portion 42 of each of the link arms 40 and 41, and a lower end of the crank lever 45 is vertically guided along a guide rod 46 standing on the base 4. Body 47 is pivotally attached. An operating lever 49 is fixed in a seesaw shape to a horizontal shaft 48 fixed to the base 4, and one end of this operating lever 49 is pivotally attached to the elevating body 47.

In this embodiment having the above-described structure, the operating lever 49 is pulled upward and the operating lever 49 pivotally attached to the elevating body 47 lowers the elevating body 47 to pivot the elevating body 47. The pivot lever 42 of each link arm 40, 41 is pulled down by the attached crank lever 45 and moved downward. As a result, as shown in FIG.
The side plates 3 which are bent in a dogleg shape and are connected to the outer frame 10 via the link arms 40 and 41 pivot outwardly around the pivot shaft 5 to open the formwork 1. Further, when closing the form 1, the side plates 3 are rotated in the standing direction by raising the elevating body 47 along the guide rod 46 by depressing the operation lever 49 or the like contrary to the above-mentioned mold opening operation. The form 1 is closed by moving. As in the first embodiment, bevel gears (not shown) are fixed to both ends of the rotary shaft 11 to which the operation lever 49 is attached, and the bevel gears of the adjacent rotary shafts 11 are meshed with each other so that the rotary shafts 11 can be moved. The side plates 3 can be opened and closed at the same time by rotating all at once. Therefore, also in this embodiment, similarly to each of the above-described embodiments, after the mold is opened, the side plates 3 can be smoothly moved from the mold opening to the mold clamping without being applied with an impact, and the deformation of each side plate 3 can be prevented. it can.

Although the respective embodiments of the present invention have been described in detail above, the present invention is not limited to the respective embodiments.
Various modifications can be made within the scope of the present invention.
That is, in the first embodiment, in order to transmit the rotation of the rotating shafts 11, the bevel gears that mesh with each other at both ends of each rotating shaft 11.
Although an example in which 18 is provided is shown, for example, as shown in FIG.
A universal joint 60 is attached to the end of each rotary shaft 11.
The pedals 61 may be fixed to the universal joints 60, and the adjacent pedals 61 may be connected to each other to form a transmission unit. In this way, each rotation axis
By connecting 11 with each universal joy 60, and further connecting the universal joy 60 to each other, by stepping on the pedal 61 fixed to the universal joy 60 with each foot, if each rotation shaft 11 turns, The rotation of the rotating shafts 11 is transmitted to the other rotating shafts 11 by the universal joint 60, so that the rotating shafts 11 rotate in unison. As described above, the transmission means of the rotary shaft is not limited to the bevel gear, and may be appropriately selected. Further, although the example in which the rotary shaft is manually rotated is shown, the rotary shaft may be electrically driven to open and close the side plate of the mold. Further, the shape of the mold, the configuration of the mold, etc. are not limited to the above-mentioned embodiments.

[0021]

According to the invention of claim 1, in a concrete formwork provided with a bottom plate and a plurality of side plates standing upright on the peripheral edge of the bottom plate, the rotation is pivotally supported outside each of the side plates. Shafts, transmission means for connecting the respective rotary shafts to transmit the rotation of the respective rotary shafts, eccentric cams coaxially fixed to the respective rotary shafts, and engagement with the eccentric cams provided on the side plates. Since the rotating shafts are simultaneously rotated by the transmitting means, the side plates are opened and closed by rotation of the eccentric cams fixed to the rotating shafts. The side plates move due to the rotation of the eccentric cam, so that the mold can be opened without the troublesome work of manually opening the side plates. Further, by rotating the eccentric cam in the opposite direction, the side plate moves to the bottom plate side and the mold is clamped, and the mold is smoothly moved from the mold opening to the mold clamping without impact on the side plate.

According to the second aspect of the present invention, in a concrete formwork comprising a bottom plate and a plurality of side plates pivotally attached to the peripheral edge of the bottom plate, an outer frame is erected on the outside of each of the side plates. The outer frame and each side plate are connected by a pair of link arms,
Since the upper end portion of the crank lever is pivotally attached to the pivotal attachment portion of each link arm, and the lower end side of the crank lever is provided with an elevating means for vertically moving the crank lever to open and close the side plate. As a result, the side plate rotates outward due to the lowering of the elevating body, and the mold can be opened without the troublesome work of manually opening the side plate. Further, by raising the elevating body, the side plate rotates in the mold clamping direction, and the side plate is smoothly moved from the mold opening of the frame to the mold clamping without impact.

[Brief description of drawings]

FIG. 1 is a sectional view of a formwork showing a first embodiment of the present invention.

FIG. 2 is a plan view in which a part of the same mold frame is cut away.

FIG. 3 is an enlarged cross-sectional view of the mold showing the opening / closing operation of the mold.

FIG. 4 is a cross-sectional view showing a second embodiment of the present invention with a part of the formwork omitted.

FIG. 5 is a plan view of the same mold.

FIG. 6 is an enlarged plan view of the form showing the opening / closing operation of the upper side plate.

FIG. 7 is an enlarged sectional view of a formwork showing a third embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view showing a mold open state of the same mold.

FIG. 9 is a plan view showing a modified example of the transmission means of the present invention.

[Explanation of symbols]

1 formwork 2 Bottom plate 3 side plates 10 outer frame 11,30 rotation axis 14 Eccentric cam 15 Engagement hole (engagement means) 18 Bevel gear (transmission means) 32, 32A belt (transmission means) 40, 41 link arm 45 crank lever 47 Lifting body (lifting means) 60 Universal joint (Transmission means)

Claims (2)

[Claims] 1. A concrete formwork comprising a bottom plate and a plurality of side plates standing upright on the peripheral edge of the bottom plate, wherein rotary shafts pivotally supported on the outside of the respective side plates and the rotary shafts are connected to each other. And transmission means for transmitting the rotation of each rotary shaft,
An eccentric cam that is coaxially fixed to each of the rotating shafts, and an engagement receiving portion that engages with the eccentric cam that is provided on the side plate, and rotate the rotating shafts simultaneously by the transmission means, An opening / closing device for a concrete formwork, characterized in that each side plate is opened / closed by rotation of the eccentric cam fixed to each rotation shaft. 2. A concrete formwork comprising a bottom plate and a plurality of side plates pivotally attached to a peripheral portion of the bottom plate, wherein an outer frame is erected on the outside of each side plate, and the outer frame and the side plates are provided. Are connected by a pair of link arms, and the upper end of the crank lever is pivotally attached to the pivotal attachment portion of each link arm, and the lower side of the crank lever is moved up and down to open and close the side plate. An opening and closing device for concrete formwork, characterized by being provided with lifting means.