JP2011148278A - Mechanism for lifting spacer member in core of concrete formwork - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism for lifting a spacer member in the core of a concrete formwork which can secure an enough lifting width of the spacer member. <P>SOLUTION: The core 1 of the concrete formwork is constituted as follows. A core form 3 having an opening over the total length of the lower surface of a peripheral wall forming a cylindrical form surface and the spacer member 4 which intervenes in the opening and opens/closes the opening are provided. The lifting of the spacer member 4 which opens/closes the opening is carried out by a link mechanism 5. The link mechanism 5 has a slider section installed in relation to a shaft 12 arranged/installed in the longitudinal direction between the core form 3 and the spacer member 4. In an upper link rod 6, the upper end part thereof is connected to the core form 3, and the lower end part is connected to the slider section, while in a lower part link rod 7, the upper end part is connected to the slider section, and the lower end part is connected to the spacer member 4, the lower end part of the upper link rod 6 of the link mechanism 5 is connected with the slider section of the link mechanism 5 below the axis of the shaft 12. The upper end part of a lower link 712 is connected with the slider section of the link mechanism 5 above the axis of the shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a core of a concrete mold used for forming a pipe block which is a concrete product, and more particularly, a spacer member for reducing the core frame is lifted and lowered by a simple mechanism, and a concrete product is provided. The present invention relates to an elevating mechanism for a spacer member in a core of a concrete mold that can be molded with a thicker wall with the same standard and can be easily removed.

  The pipe block that forms a waterway such as a sewer is a concrete product having a through hole in the center, and the core used together with the formwork to form this through hole is an easy to mold product after solidifying the concrete. A structure that can be released from and taken out from the machine is required.

Conventionally, in order to make it easier to pull out the inner frame installed inside the outer frame, the spacer member forming a part of the frame surface is mechanically removed by a link mechanism and fluid pressure to reduce the peripheral wall. Something to be restored is proposed.
Also, there is a type in which a link mechanism driven by a screw rod is provided on a core frame that can be contracted in the side surface direction, and the core frame is elastically deformed by this link mechanism to release the core frame.

  Furthermore, as a mechanism for moving the spacer member up and down using a link mechanism, a shaft is disposed in the longitudinal direction between the core frame and the spacer member, and a sleeve is slidably inserted into the shaft. There is a link mechanism for raising and lowering the spacer member, an advance / retreat mechanism is interposed between the sleeve and the shaft, and the advancement / retraction of the sleeve and the shaft and the link mechanism are interlocked to raise and lower the spacer member.

  The specific structure of the link mechanism is such that one end of the link rod is pivotally attached to the core frame or the spacer member, and the corresponding other end is overlapped to be pivotally attached on the axis of the sleeve or the shaft.

JP 52-19708 Shokai 57-70806 Japanese Utility Model Publication No.59-137003 Actual Kaihei 02-8907 Actual Kaihei 01-142746 JP2004-1568

The link mechanism and fluid pressure are suitable for a large-sized pipe block, but a pipe block having a small hole diameter is unsuitable and has a problem of high cost.
In addition, with the link mechanism and the screw rod, the rotation operation of the screw rod is complicated and requires a large driving force, and the screw rod is likely to be rusted. Oil has to be adhered to the surface, and the maintenance is very troublesome.

And what raises and lowers the spacer member by the link mechanism is one in which one end of the link rod is pivotally attached to the core frame or the spacer member, and the corresponding other end is overlapped to be pivotally attached on the axis of the sleeve or the shaft. Therefore, the range in which the link mechanism can perform an effective action in the core space is determined by the angle of the link rod.
In other words, the longer the link rod, the longer the distance between the pivots, and the greater the lift, the easier the product release and removal.

On the other hand, a pipe block installed on a road surface that receives the weight of an automobile or the like requires strength and has a thicker wall.
However, because the outer dimensions are constant, the core frame space is reduced in order to make it thicker. On the other hand, if the raising / lowering width of the link mechanism is not increased, the product can be released or removed. It will not be possible.

Further, in a product having a slit hole on one surface, a slit frame plate to be molded is suspended from the spacer member. If the one surface having the slit holes becomes thicker, the slit frame plate also hangs down accordingly, and the contact surface between the slit frame plate and the concrete product becomes wider. Since a frictional force is generated on this contact surface, the product cannot be taken out only by lateral movement in the longitudinal direction. Accordingly, the slit frame plate is moved laterally while being left in the product and taken out from the mold body, and then the slit frame plate is taken out from the product.
In this way, in order to release the slit frame plate from the product, it is a serious problem to secure the raising / lowering width of the spacer member on which the slit frame plate is suspended.

  Therefore, the present invention provides a mechanism for raising and lowering the spacer member in the core of the concrete mold frame that can secure a sufficient raising / lowering width even when the inner space of the core frame is small and narrow, and can be formed on one surface of the product. In addition, the product can be removed from the mold in the horizontal direction as before, and the purpose is to improve the efficiency of the die-cutting operation.

The raising / lowering mechanism of the spacer member in the core of the concrete mold according to claim 1 includes a core frame having an opening over the entire length of the lower surface of the peripheral wall forming the cylindrical frame, and an opening interposed between the opening and the opening. A spacer member that opens and closes the opening portion, and the spacer member that opens and closes the opening portion is moved up and down by a link mechanism. This link mechanism is provided in association with a shaft disposed in the longitudinal direction between the core frame and the spacer member. The upper link rod is connected to the core frame, the lower end portion is connected to the slider portion, and the lower link rod is connected to the slider portion and the lower end portion is connected to the spacer member. In the core of the formwork,
The lower end of the upper link rod of the link mechanism is connected to the slider of the link mechanism below the shaft axis, and the upper end of the lower link is connected to the slider of the link mechanism above the shaft axis. It is characterized by.

  A lifting mechanism for a spacer member in a core of a concrete mold according to claim 2 is the link mechanism according to claim 1, wherein the sleeve is slidably fitted into the shaft and has at least one slider portion fixed to the sleeve. And a link mechanism having at least one slider portion fixed to the shaft, an advance / retreat mechanism is interposed between the sleeve and the shaft, and the advance / retreat of the sleeve and the shaft is linked with the link mechanism. It is what

  The lift mechanism of the spacer member in the core of the concrete mold according to claim 3 is characterized in that, in claim 1, the shaft has a screw shaft portion in which left and right screws are threaded, and at least one pair of slider portions Is characterized by having one or the other nut member that is screwed into one or the other screw shaft portion and approaches or separates from each other as the shaft rotates.

  The lifting mechanism of the spacer member in the core of the concrete mold according to claim 4 is the structure according to any one of claims 1 to 3, wherein the upper link rod and the lower link have the same shape, and the lower end of the upper link rod and The pivot of the slider part of the link mechanism to which the upper end of the lower link is connected is formed at a position symmetrical with respect to the axis.

  According to the elevating mechanism of the spacer member in the core of the concrete mold according to any one of claims 1 to 3, the lower end of the upper link rod is connected to the slider portion of the link mechanism below the axis of the shaft, and the upper end of the lower link is Since it is connected to the slider part of the link mechanism above the shaft axis, the upper link rod and lower link are longer than the conventional sleeve and the link rod pivotally mounted on the shaft axis, so that it can move up and down. It has an effect that can be increased.

  In addition, the pivot of the slider portion of the corresponding link rod of the related art is provided by superimposing on the axis of the shaft and is configured with a three-point axis, whereas each pivot of the upper link rod and the lower link is independent. Since it is composed of four-point axes, each of them acts on the movement of the shaft, so that an effect of smooth vertical movement without interference can be expected.

  According to the fourth aspect of the present invention, the lifting mechanism of the spacer member in the core of the concrete mold forms the same as the lifting mechanism of the spacer member in the core of the concrete mold of the first aspect. The link has the same shape, and the pivot axis of the slider part of the link mechanism to which the lower end of the upper link rod and the upper end of the lower link are connected is formed in a vertically symmetrical position with respect to the axis line. The link can be a common part.

  Therefore, in a mold for molding a product having the same outer shape, the core spacer member can be made wider to increase the width of the core, thereby making it possible to mold a thick and sturdy product. Thus, the product can be taken out from the mold without being affected by the slit frame plate only by the lateral movement.

It is a principal part longitudinal section front view at the time of the fall of the core which shows one embodiment of the concrete formwork of this invention. It is a partial cross-sectional front view in the cross-sectional line CC of FIG. It is the partially longitudinal front view which expanded D part of FIG. It is a principal part vertical side view at the time of the raise of the core of the concrete formwork of this invention of FIG. It is a cross-sectional side view of the concrete product shape | molded using this core. It is a principal part longitudinal front view at the time of the fall of the core which shows other embodiment of the concrete formwork of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal front view of the concrete formwork core of the present invention when the core is lowered (during molding). FIG. 2 is a partial cross-sectional front view taken along a cross-sectional line CC in FIG.
The core 1 of the present invention is used with a main body of a concrete formwork (not shown), and is used for manufacturing a hollow tube block (see FIG. 5) which is a concrete product 30.

The core 1 is interposed in a substantially circular cylindrical core frame 3 in which an opening 2 is formed over the entire length of the lower surface, and the opening 2 of the core frame 3, and the opening 2 extends over the entire length. A spacer member 4 having an inverted trapezoidal cross section is provided.
The spacer member 4 is provided with a slit frame plate 4A for forming a slit hole provided on one surface of the product, and a link mechanism 5A between the spacer member 4 facing the inner side of the ceiling portion 3A of the core frame 3; 5B is provided so that the spacer member 4 can be moved up and down.

Next, the structure of this link mechanism 5A is demonstrated using the partial longitudinal cross-sectional front view which expanded D part of FIG. 1 of FIG. The link mechanism 5B is obtained by reversing the right and left of FIG.
A bearing member 8 is fixed to the inner side of the ceiling portion 3A of the core frame 3, and the upper end portions of the upper link rods 6A (6B) are pivotally attached 9 to shafts on the front and back sides of the bearing member 8, respectively. The bearing member 10 is fixed on the spacer member 4 so as to face this, and the lower end of the lower link rod 7A (7B) is pivotally attached 11 to the shaft of the bearing member 10 on the front and back side. ing.

On the other hand, a shaft 12 is disposed in the longitudinal direction in the core frame 3 at an intermediate portion between the upper link rod 6A (6B) and the lower link rod 7A (7B). A sleeve 13 is fitted on the outer peripheral surface on the end side.
The sleeve 13 or the shaft 12 is connected to the lower ends of the upper link rods 6A and 6B and the upper ends of the lower link rods 7A and 7B of the link mechanism 5A or 5B.

A holder bearing 14A corresponding to the slider portion is fixed to the sleeve 13. The holder bearing 14A has two shafts at the upper and lower symmetrical positions off the axis of the shaft 12 on the front back side, and one lower shaft. The upper link rod 6A has a lower end pivotally attached 15 to the other upper shaft, and an upper end of the lower link rod 7A is pivotally attached 16 to the other upper shaft.
If the position of the pivot 15 is separated from the axis of the shaft 12, the lifting width will be larger, but considering the required thickness of the molded product, the burden on the advance / retreat means and the operability of the link rod To be designed.

Similarly, a holder bearing 14B corresponding to the slider portion is fixed to the shaft 12 on which the link mechanism 5B is disposed on the opposite side to which the sleeve 13 is provided, and the axis of the shaft 2 is connected to the front back side of the holder bearing 14B. There are two shafts at the upper and lower symmetrical positions, and the lower end of the upper link rod 6B is pivotally attached 15 to one lower shaft, and the upper end portion of the lower link rod 7B is pivoted to the other upper shaft. It is pivotally attached 16 so that it can freely rotate.
In order to make the lift consistent with the link mechanism 5A, in the drawing, it is configured by the same member that is easy to align the vertical height position of the shaft, the sleeve 17 is integrally fixed to the shaft 12, and the holder bearing 14B is provided. Wearing. Therefore, the holder bearing 14 </ b> B moves together with the shaft 12.

  The upper and lower link rods 6 and 7 have the same length so that they do not interfere with each other when the upper and lower link rods 6 and 7 are extended or retracted. Curving the middle part, installing the link mechanisms 5A and 5B with the upper and lower link rods tilted, and arranging them in a generally U shape in the opposite direction are the same as the basic structure of the link mechanism.

Hereinafter, the crank mechanism 18 that is a means for moving the shaft 12 back and forth will be described with reference to FIGS. The crank mechanism 18 includes a swing link 19, a rotation link 20, a handle 21 and a connecting plate 22.
The swing link 19 is swingably connected to the base end of the shaft 12, and the swing link 19 and the rotation link 20 are pivotally attached by a pin 23.
The connecting plate 22 is formed integrally with the sleeve 13. A rotating link 20 is pivotally attached to the connecting plate 22. When the rotation link 20 is rotated by the handle 21, the shaft 12 and the sleeve 13 move relative to expand / retract the link mechanisms 5A and 5B.

Next, a method of using the core having such a configuration will be described.
In the core 1 of the drawing showing an embodiment, a concrete product 30 as shown in FIG. 5 is molded.
The core 1 is mounted in an expanded state on a concrete formwork body (not shown) (FIG. 1), and the concrete is cast and solidified.

After solidification, when the core 1 is retracted and removed, the front and rear frames of the concrete mold body (not shown) and the end plate on the crank mechanism 18 side are turned over.
As shown in FIG. 2, when the handle is turned 180 degrees so that the shaft 12 advances to the front side (crank mechanism mounting side) of the core 1, the turning link is turned to the front side of the core 1. The linked rocking link (shaft 12) and the connecting plate 22 (sleeve 13) move relative to each other, and the linked link mechanisms 5A and 5B are degenerated so that the spacer member has less contact surface with the concrete. 4 is raised.

  As the spacer member 4 is lifted, the side wall of the core 2 is elastically bent inward and contracted (actually there is an auxiliary mechanism for contraction), and the core frame 3 and the spacer member 4 adhere to the concrete. Since it leaves | separates from a surface, a concrete product can be extracted from the core 1 to a horizontal direction.

  When the core 1 is returned to the original position in preparation for the next process of placing the concrete, if the handle is rotated 180 degrees and the shaft is moved backward to the rear side of the core 1 as shown in FIG. The link mechanisms 5A and 5B extend, the spacer member 4 descends, and the side wall portion of the core frame 3 returns to its original state by elasticity.

FIG. 6 is a longitudinal sectional front view of a main part when the core is lowered, showing another embodiment of the link mechanism of the concrete form of the present invention.
The relationship with the slider portion provided in relation to the shaft of the link mechanism is different from that of the above-described embodiment, the other is the same configuration, and the corresponding members are denoted by the same reference numerals.

  Screw shaft portions 23A and 23B are formed by screwing left and right screws on the left and right sides from the central portion of the shaft 12, and nut members 26A and 26B that are screwed into the screw shaft portions 25A and 25B are provided. The lower end portions of the upper link rods 6A and 6B and the upper end portions of the lower link rods 7A and 7B of the link mechanism 5A or 5B are connected to the slider portion having the members 26A and 26B.

The connection with each link rod has two shafts at the upper and lower symmetrical positions of the nut members 26A and 26B off the axis of the shaft 12, and the lower end portion of the upper link rod 6A is rotated on one lower shaft. The lower link rod 7A is pivotally attached 16 to the other upper shaft.
Therefore, when the shaft 12 is rotated forward and backward, the nut members 24A and 24B approach and separate from each other, and the link mechanisms 5A and 5B extend and retract, thereby moving the spacer member 4 up and down.

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment, and the relationship between the shaft serving as the expansion / contraction means of the link mechanism and the slider portion is also limited. However, the core can be applied to a cylindrical core having an oval cross section or a square cross section without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Core 2 Opening part 3 Core frame 4 Spacer member 5 Link mechanism 6A, 6B Upper link rod 7A, 7B Lower link rod 8, 10 Bearing member 9, 11, 15, 16, 24 Pivot 12 Shaft 13, 17 Sleeve 14A, 14B Holder bearing 18 Crank mechanism 19 Swing link 20 Rotating link 21 Handle 22 Connecting plate 23 Pin 25A, 25B Screw shaft portion 26A, 26B Nut member

Claims (4)

A spacer frame that has an opening over the entire length of the lower surface of the peripheral wall that forms the cylindrical frame surface, and a spacer member that is interposed in the opening and that opens and closes the opening. The link mechanism moves up and down, and this link mechanism includes a slider portion provided in association with the shaft disposed in the longitudinal direction between the core frame and the spacer member, and the upper link rod has an upper end portion on the core frame. In the core of the concrete mold, the lower end portion is connected to the slider portion, and the lower link rod is connected to the slider portion and the lower end portion is connected to the spacer member.
The lower end of the upper link rod of the link mechanism is connected to the slider of the link mechanism below the shaft axis, and the upper end of the lower link is connected to the slider of the link mechanism above the shaft axis. Lifting mechanism of the spacer member in the core of the concrete mold characterized by the above.   A sleeve is slidably inserted into the shaft, and a link mechanism having at least one slider portion fixed to the sleeve and a link mechanism having at least one slider portion fixed to the shaft are provided. 2. The raising / lowering mechanism of the spacer member in the core of the concrete mold according to claim 1, wherein an advancing / retreating mechanism is interposed between the sleeve and the shaft, and the advancing / retreating of the sleeve and the shaft is linked with the link mechanism.   The shaft has a screw shaft portion in which left and right screws are threaded, and the slider portion constituting at least one pair is screwed into one or the other screw shaft portion and either approaches or separates as the shaft rotates. 2. The raising / lowering mechanism of the spacer member in the core of the concrete mold according to claim 1, comprising the other nut member.   The upper link rod and the lower link have the same shape, and the pivot axis of the slider portion of the link mechanism to which the lower end portion of the upper link rod and the upper end portion of the lower link are connected is formed at a vertically symmetrical position of the axis. The raising / lowering mechanism of the spacer member in the core of a concrete formwork in any one of Claim 1 thru | or 3 characterized by the above-mentioned.

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