JPH0573564B2 - - Google Patents

Description

Detailed Description of the Invention - Field of Industrial Application - This invention relates to a formwork for molding concrete blocks, including the structure of a core frame used to form a cylindrical cavity inside the block; In particular, it relates to its opening/closing structure.

-Technical Background- A block generally called a gutter block or a slit gutter block is a block in which a drainage ditch at the roadside is formed into a culvert, and a narrow slit for drainage is opened at the roadside. It has a shape as shown in the figure. The groove 30 serving as the underdrain is formed by a cylindrical core frame, but after the concrete hardens, the core frame must be squeezed inward and removed from the mold in the longitudinal direction. Furthermore, during block molding, it is necessary to secure both ends of the core frame into the openings provided in the edge plate without any gaps.

-Prior art and problems- Various structures are known for squeezing the core frame when demolding blocks, one of which is the one disclosed in Japanese Utility Model Application No. 137009/1983. .
In this conventional structure, a plate member (insertion member) with a trapezoidal cross section is inserted from the inside into a longitudinal slit provided in a cylindrical frame plate of a core frame, and this plate member and frame plates on both sides of the slit are inserted into a longitudinal slit. When the plate-shaped member is retracted, the pin pulls the inclined elongated hole, that is, the frame plate on both sides of the slit, by a cam action, and this pulling occurs. The core frame is narrowed by movement. That is, by retracting the plate-like member, a slit is formed to serve as the drawing margin for the frame plate, and the center is interlocked with the retracting operation of the plate-like member to form the slit by fitting the inclined elongated hole and the pin. The child frame is narrowed so that the core frame can be opened and closed with a single operation.

However, in this conventional structure, the pin slides against the side edge of the long hole while a large force is applied to squeeze the core frame, so a large force is required to squeeze the core frame, and the interaction between the long hole and the pin is There was also the problem of large wear on the sliding parts. Also, if the above structure is adopted for the formwork for forming the underdrain block with slit grooves,
Since it is necessary to start the drawing operation of the core frame after the wedge member forming the slit groove is largely retracted, a long dog-shaped elongated hole must be provided, which increases the size of the reinforcing plate. There were problems such as the difficulty of machining long holes.

-Object of the Invention- The object of the present invention is to provide a core frame having a particularly effective structure for forming a concrete block having a longitudinal slit groove 31 communicating with a groove 30 serving as an underdrain. The purpose of the present invention is to obtain a formwork that has a simpler structure and allows opening and closing of the core frame with less force.

-Structure of the invention- If explained using the symbols attached to the illustrated embodiments,
The core frame for molding groove blocks of the present invention has a core frame 4
A longitudinal slit 6 is provided in the cylindrical frame plate 5, and the core frame 4 is inserted into this slit from the inside.
A wedge member 14 that expands the slit 6 is provided, and connecting members 13, 24, 26, 27 that connect the frame plates 5b, 5b on both sides of the slit 6 are provided. When the wedge member 14 is withdrawn from the slit 6, the wedge member moves a predetermined distance and then engages with the connecting members 13, 24, 26, 27 to tension them. By making the slit 6
This is characterized by deforming the frame plate 5 in the direction of narrowing the frame plate.

-Operation- That is, the longitudinal wedge member 14 forming the slit 31 of the block is made to protrude and retract from the inside of the core frame 4, and the slit 6 for protruding and retracting the wedge member is used as the drawing margin of the frame plate 5 of the core frame. , the wedge member 1 is inserted into the slit 6.
By inserting the core frame 4, the core frame 4 is
The slit 6 can be expanded and fastened to the opening 2a of the edge plate 2 without any gaps.
Connecting members 13 and 2 connect the frame plates 5b and 5b on both sides of the
4, 26, and 27, and when the wedge member 14 is withdrawn from the slit 6, the wedge member 1 after a predetermined movement
4 and the connecting members 13, 24, 26, 27 are substantially engaged, and by further withdrawing the wedge member 14 after this engagement, the connecting members 13, 24, 26, 2
The frame plates 5b, 5b on both sides are pulled together through the inner frame 7, so that the core frame 4 is narrowed.

-Embodiment- Figures 1 to 3 show an embodiment of the present invention. FIG. 3 is a diagram showing the formwork for molding the block shown in FIG. 7 with one side plate open, where 1 is the substrate, 2, 2 are the edge plates, 3, 3 are the side plates, and 4 is the invention of the present invention. This is the core frame.

FIG. 1 is an enlarged side view of the core frame 4, in which 5 is a cylindrical frame plate having a longitudinal slit 6, 7, 7 and 8 are reinforcing plates fixed to the frame plate 5, and 9, 9 are reinforcing plates fixed to the frame plate 5. A stringer consisting of a square pipe fixed to a reinforcing plate 8, 10
11 is a bearing plate fixed to the bearing plate 10, 12, 12 is a pin implanted in the reinforcing plates 7, 7, 13 is a pin 12, 12
A connecting member 14 consisting of a strip plate installed between them is a wedge member that is inserted into and removed from the slit 6 from the inside. No reinforcing plates are provided at the upper corners 5a, 5a of the frame plate 5, and the core frame 4 is squeezed by elastic deformation of the frame plate 5 at the upper corners.

FIG. 2 is a diagram showing a mechanism for inserting and extracting the wedge member 14 into and out of the slit 6. Reference numeral 15 is a screw rod that is rotatably but immovably supported in the axial direction by the bearing 11. Screws 16a, 1 in the opposite direction
6b, that is, a right-hand thread 16a and a left-hand thread 16b are provided. 17, 17 are nut members screwed into the screws 16a, 16a, respectively; 18, 18 are pins implanted on both sides of the nut members 17, 17;
19, 19 are protrusions 2 formed on the upper edge of the wedge member 14.
0 through pin, 21, 21 is pin 18, 1
Links 22 pivotally connect the 9 parts, respectively, and 22 are handles for rotating the screw rods 15.

Next, the expanding and squeezing operations of the core frame 4 during mold assembly and mold removal will be described with reference to FIGS. 1 to 3.

When the core frame 4 is inserted into the opening 2a of the edge plate 2 and its both ends are supported by the edge plates 2, 2, and the screw rod 15 is rotated in a direction in which the nut members 17, 17 approach each other, the connecting link 21, 21 respectively rotate in the rising direction about the pin 19, thereby pushing the wedge member 14 downward. When the wedge member 14 moves downward, the slit 6 is expanded by the wedge action, and the frame plate 5 is expanded by elastic deformation of both upper corners 5a and 5a, and is fastened to the opening 2a of the edge plate 2. The wedge member 14 protruding from the slit 6 functions as a mold for forming the slit 31 of the block.

When opening the mold after block molding, use the screw rod 15.
If you rotate it in the opposite direction, nut member 1
7 and 17 move away from each other, and the connecting links 21 and 21 rotate in the direction of collapse, so the wedge member 14 is pulled up and the slit 6 and the wedge member 14 are pulled up.
There will be a gap between the two. When the wedge member 14 is pulled up further, the protrusion 20 on the upper edge of the wedge member 14 comes into contact with the connecting member 13, and as the wedge member moves up further, the connecting member 13 is moved as shown by the imaginary line in FIG. bend. Due to this bending, the pins 12, 12 are pulled in the direction in which they are drawn toward each other, and the frame plate 5
Both upper corners 5a, 5a of the core frame 4 are bent inward and the core frame 4 is squeezed, creating a gap required for demolding between the molded block and the core frame 4. Therefore, by pulling out the core frame 4 in the longitudinal direction through the opening 2a of the edge plate 2, the core frame 4 can be demolded. Third
In the form shown in the figure, balls 23, 23 are provided on the edge plate 2 to support the core frame 4 during demolding, so that the core frame 4 can be pulled out with a lighter weight.

In the above embodiment, the connecting member 13 made of a band plate is used as a member for connecting the frame plates 5b, 5b on both sides of the slit 6 via the pins 12, 12. Wires 24, 24 can also be used as shown. In the embodiment shown in FIG. 4, the pins 12 and 12 and the pin 25 implanted in the upper edge of the wedge member 14 are connected to the wires 24 and 25, respectively.
The wire is tensioned between both pins 12 and 25 when the wedge member 14 moves upward by a predetermined distance, and the wires 24 and 24 tighten the pin 12 by the subsequent upward movement of the wedge member 14. , 12 are drawn toward each other. Also, although this is not a highly recommended structure from a cost standpoint, as shown in Figure 5, links 26, 27, and 26
Of course, it is also possible to have a structure in which 2 and 12 are connected.

- Effects of the Invention - According to the core frame of the present invention as described above, the core frame can be expanded and narrowed by moving the wedge member forward and backward, and a strong force due to the wedge action is applied during expansion. The core frame can be fastened to the opening of the edge plate, and the core frame is simultaneously squeezed by retracting the wedge member for forming the slit 31 of the block, so that the work of demolding the core frame can be done efficiently. be able to. In addition, when the wedge member is moved out of the slit, the wedge member moves a predetermined distance and then engages with the connecting member. This allows a large drawing allowance to be formed, making it particularly suitable as a core frame structure for slit-groove block molding, and because the inclination angle of the wedge member can be made small, a large expansion can be achieved in the core frame with a small pushing force. It can give you strength. Furthermore, since the connecting member squeezes the pushed core frame without causing relative slippage at the contact part with the wedge member from which it exits, there is no wastage of operating force due to friction when squeezing the core frame, and a lighter force is used. The core frame can be opened and closed.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a side view of the core frame, FIG. 2 is a perspective view showing the advancing and retracting mechanism of the wedge member, and FIG. FIG. 3 is an overall side view of the formwork shown with the side plates opened. Fourth
5 and 5 are side views schematically showing other embodiments of the present invention, and FIGS. 6 and 7 are perspective views showing examples of molded blocks. In the figure, 2 is the edge board, 4 is the core frame, 5 is the frame board, and 6
is a slit, 7 and 8 are reinforcing plates, 10 is a bearing plate, 1
2 is a pin, 13 is a connecting member, 14 is a wedge member, 15
1 is a screw rod, 16a and 16b are screws in opposite directions, 17 is a nut member, 21 is a link, 24 is a wire, and 26 and 27 are connecting links.

Claims (1)

[Claims] 1 A longitudinal slit is provided in the cylindrical frame plate of the core frame, and a wedge member is provided that is inserted into this slit from the inside to expand the core frame, and the frame plates on both sides of the slit are A coupling member is provided for connecting the coupling member, the coupling member being arranged to engage and tension the wedge member exiting the slit, and the coupling member being arranged to engage and tension the wedge member as it exits the slit, after the wedge member has traveled a predetermined distance when the wedge member exits the slit. A core frame for molding a grooved block, characterized in that a frame plate is deformed in a direction to narrow the slit by engaging and tensioning a member.