JP2699292B2 - Mold for hollow concrete products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow concrete product forming die for forming a hollow concrete product such as a box culvert used for a culvert.

[0002]

2. Description of the Related Art A conventional general mold for molding a hollow concrete product is such that a pair of side plates and a pair of end plates are fastened with bolts, a core frame is placed between both side plates, and concrete is filled. Is a structure in which the side plate and the end plate are separated by removing the bolt, and the mold is removed. Also, in a molding die for large-sized concrete block, a side plate is provided so as to be movable back and forth, and when filling concrete, the side plate is clamped by a clamp device in a state where the side plate is advanced. It is known from the gazette.

[0003]

In the conventional mold for fastening the side plate and the end plate with bolts, an operator has to manually tighten or loosen a large number of bolts every time one product is formed. It requires a great deal of labor and time. Therefore, it has been difficult to improve the efficiency of the molding operation. Further, even if the side plate is provided so as to be able to move back and forth, and a structure in which this side plate is clamped by a clamp device is employed in a hollow concrete product forming die, an operation of moving the side plate every time one product is formed and a clamping device. Must be performed separately. Therefore, it is not possible to expect a significant increase in efficiency. For this reason, there has been a demand for the development of a hollow concrete product-like molding die that does not require bolt tightening and removal operations, is easy to operate, and can greatly improve the operation efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and has a fixed side plate erected on one side of a bed and a standing side plate on the other side of the bed so as to be movable back and forth toward the fixed side plate. A movable side plate, a first wedge plate rotatably mounted on left and right ends of the fixed side plate, a second wife plate rotatably mounted on left and right other ends of the fixed side plate, a fixed side plate and a movable side plate And a core frame that is detachably arranged between the first and second wedge plates, wherein the movable side plate is moved toward the fixed side plate to set the core frame between the two side plates, and one end of both side plates is closed, A first clamp mechanism for clamping the end plate and the end of the core frame in a state where the end is closed by a second end plate closed at the other end, a second clamp mechanism for clamping the end of the core frame and the bed, and movable A third clamping mechanism that clamps the side plate and the end plate, and a movable side plate that advances the movable side plate by a clamping operation. The retract the movable side plate solves the clamp by unclamping clamps on the bed 4
It is provided with a clamp mechanism.

[0005]

When the clamp operation of the fourth clamp mechanism is performed, the movable side plate advances and abuts on the bed. When the clamp operation is continued in this state, the movable side plate is clamped to the bed by the fourth clamp mechanism and fixed to the movable side plate. Install a core frame between the side plates, close the first wife plate and close one end of both side plates,
Close the second end plate and close the other end of both side plates. In this state, by clamping with the first clamp mechanism, the end plate and the end of the core frame can be fixed, and by clamping with the second clamp mechanism, the end of the core frame and the bed can be fixed. By clamping with the three clamps, the movable side plate and the end plate can be fixed. Thus, the movable side plate, the first
When the second end plate and the core frame are clamped and fixed, a predetermined gap is formed therein, and a product can be formed by filling concrete into the gap. When the clamps of the first and second clamp mechanisms are released, the core frame can be released. When the clamp release operation of the fourth clamp mechanism is performed, the clamp of the movable side plate is released.
When the clamp releasing operation is continued, the movable side plate is retracted. Therefore, when converted to this state, the product can be released.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a mold for molding a box culvert, and FIG. 2 is a front view. This mold is
A fixed side plate 2 erected on one side of the bed 1, a movable side plate 3 erected on the other side of the bed 1 so as to be able to move back and forth toward the fixed side plate 2, and a pivot on one of the left and right ends of the fixed side plate 2. A first end plate 4 pivotally attached to the second end plate 5 rotatably attached to the left and right ends of the fixed side plate 2, and a detachable arrangement between the fixed side plate 2 and the movable side plate 3. The movable side plate 3 is moved toward the fixed side plate 2 to install the core frame 6 between the side plates 2 and 3, the first end plate 4 is closed, and one end of each of the side plates 2 and 3 is provided. In the state where the gap is closed and the second end plate 5 is closed and the other end of both side plates 2 and 3 is closed, the end plate and the end of the core frame 6 are clamped by the first clamp mechanisms 7 and 7, and the core frame is The end of the bed 6 and the bed 1 are clamped by the second clamp mechanisms 8 and 8, the movable side plate 3 and the end plates 4 and 5 are clamped by the third clamp mechanisms 9 and 9, 3 and the bed 1 and the fourth clamping mechanism 1
It is configured to be clamped by 0. Then, between the bed 1 and the lower surface of the core frame 6, the fixed side plate 2 and the core frame 6
Between the movable side plate 3 and the side surface of the core frame 6, concrete is filled from the upper surface open portion into the gap 11 formed between the movable side plate 3 and the side surface of the core frame 6. A box culvert is formed by filling concrete to a predetermined thickness in the space between the upper edge and the upper edges of the end plates 4 and 5.

The bed 1 is a hollow rectangular plate-like member in which the fourth clamp mechanism 10 and the slide support mechanism of the movable side plate 3 can be housed by welding an iron plate, and an upper stage for forming the lower surface of the box culvert. The upper surface of the portion is a smooth surface, and the fixed side plate 2 is provided upright on one side of the lower portion.

As shown in FIG. 3, the fixed side plate 2 is a rectangular plate member having a predetermined strength by welding an iron plate, and has a surface on the side of the movable side plate 3 forming the side surface of the box culvert. It has a smooth surface and its lower end is fixed on the bed 1 by welding or bolts. The left and right widths are set according to the length of the box culvert to be molded, and the height is set according to the vertical dimensions of the box culvert. Also,
In the figure, reference numeral 12 denotes a reinforcing member for connecting and reinforcing the outer surface of the fixed side plate 2 and the end of the bed 1.

As shown in FIGS. 4 and 5, the movable side plate 3 is a rectangular plate member having substantially the same size as the fixed side plate 2.
The lower end of the support pillar 13 attached to the outer surface is fixed to the carriage 14, and the wheels 15 of the carriage 14 are supported by being mounted on rails 16 provided in the bed 1.
It is configured to be able to move back and forth with respect to. The movable side plate 3 moves forward by the clamp operation of the fourth clamp mechanism 10 and retreats by the release operation of the clamp. The configuration of the fourth clamp mechanism 10 will be described later.

The first end plate 4 is a substantially rectangular frame formed with a substantially rectangular opening 17 slightly smaller than the end face of the core frame 6, and the end on the fixed side plate 2 side is separated from the bracket and the shaft. The hinge 18 is pivotally attached to one end of the fixed side plate 2. By rotating about the axis of the hinge 18, the one end of the fixed side plate 2 and one end of the movable side plate 3 can be opened and closed.

The second end plate 5 is symmetrical to the first end plate 4 in the left and right direction, but has the same structure.
9, the other end of the fixed side plate 2 is pivotally attached to the other end of the fixed side plate 2 by a hinge 20, and the other end of the fixed side plate 2 and the movable side plate 3 Can be opened and closed with the other end.

On the inner surfaces of the first and second end plates 4 and 5, irregularities (not shown) for forming spigot concaves or convexes for joining the end faces of the box culverts are formed. I have.

The core frame 6 has side members 22, 22 rotatably fixed to the left and right side edges of the bottom member 21, and the upper member 23 can be moved up and down between the upper ends of the both side members 22, 22. The upper part of each side member 22 and the end surface of the upper surface member 23 are connected by a link piece 24 that can be bent in the middle, and one end is axially mounted and one end is axially mounted on the upper surface member 23 or the bottom member 21.
The bottom member 21 and the top member 23 are connected by a cross arm 25 whose other end is slidably attached to the bottom member 21 or the top member 23. Therefore, at the time of molding, as shown by a solid line in FIGS.
When the upper surface member 23 is lifted by the action of, the left and right side members 22, 22 rise substantially vertically via the link pieces 24,
When the upper member 23 is raised to a predetermined height, the upper member 2
3 closes the gap between the upper ends of both side members 22 and 22, and the inclined side end surface of the upper surface member 23 can press and contact the left and right side members 22 and 22 to prevent concrete from leaking from the seam. can do.

Then, when the upper surface member 23 is lowered by the action of the cross arm 25, the left and right side members 22, 22 are respectively pulled down through the link pieces 24 as shown by the two-dot chain line in FIG. The core frame 6 is converted into a collapsed state. Therefore, when removing the core, the core frame 6 can be easily taken out from the openings 17 and 19 of the end plates 4 and 5 by converting the core frame 6 to a closed state.

Next, each clamp mechanism will be described.
The first clamp mechanism 7 is provided on the outer surface of the first and second end plates 4 and 5 and clamps the end plate and the end of the core frame 6.

The first clamping mechanism 7 provided on the second end plate 5
As shown in FIG. 2, the first
The rotating shaft 26a is connected to the second rotating shaft 26b along the side edge on the fixed side plate 2 side, and the third rotating shaft 2 is
6c are arranged, and each rotating shaft 26 is supported by a bearing 29 fixed to the end plate 5, and a first, second and third rotating shafts 26a, 26b, 26b, 26c are provided by a bevel gear 30 provided at an end of each rotating shaft 26. 26c are connected, and clamp members 31 are provided in the middle of each rotary shaft 26.

The clamp member 31 has a U-shaped cross section and one end fixed to the rotation shaft 26. The clamp member 31 has a substantially C-shaped bend in the middle so that the side surface is opened, and one end is pin 33. A crank 34 pivotally attached to the other end of the rotary cam 32 so as to be rotatable, and a T-shaped hook 35 at the tip.
And a hook rod 36 whose base end is fixed to the other end of the crank 34. One end of the rotating cam 32 fixed to the rotating shaft 26 is In this state, the hook rod 36, the rotating shaft 26, and the pin 33 are located in a straight line, or the pin 33 is bent more than the position of the rotating shaft 26 in this state. The dimensions of the rotary cam 32 and the crank 34 are set such that the rotary cam 32 and the crank 34 can be stopped at the open side (upper side in the figure) of the portion 37.

In the drawing, reference numeral 38 denotes stopper plates which are erected on the end face of the core frame 6 at intervals in which the hook rods 36 enter. The receiving groove 39 is formed, and as shown in FIG. Therefore, hook rod 36
When the rotary cam 32 is rotated in the counterclockwise direction in FIG. 8 by the rotation of the rotary shaft 26 in a state where the leading end portion is between the stopper plates 38, the pin 33 gradually moves away from the stopper plate 38 by this rotation. As a result, the hook rod 36 is pulled by the pin 33 and moves to the right in FIG.
When the pin 33 approaches a farthest position farthest from the stopper plate 38, that is, a position intersecting a line extending from a straight line connecting the receiving groove 39 and the rotary shaft 26, the catching portion 35 moves the receiving groove 39 of the stopper plate 38. When the pin 33 is further rotated to the farthest position, the pin 33 pulls the hooking rod 36 most strongly.
As a result, a pulling force acts on the hooking rod 36, and the pulling force firmly engages the hooking portion 35 in the receiving groove 39. Even if the pin 33 slightly passes through the farthest position, the above described pulling force acts on the hooking rod 36, and the clamped state continues.

In this state, even if a force in the opposite direction (left direction in FIG. 8) acts on the hooking rod 36 due to vibration or the like, this force acts as a force for rotating the rotary cam 32 counterclockwise. The rotating cam 32 does not return clockwise. Therefore, once the hooking portion 35 is
9, the clamped state is stably maintained even when subjected to vibration.

When the rotating shaft 26 is rotated clockwise from the above clamped state, the pin 33 pulls the hooking rod 36 the most when passing through the farthest position, so that the clamping strength is maximized at this time. When the pin 33 descends in FIG. 8 after passing through the farthest position, it gradually approaches the stopper plate 38 side. Therefore, the movement of the pin 33 causes the hook rod 36 to gradually move toward the stopper plate 38, whereby the hook portion 35 is disengaged from the receiving groove 39 and the clamp is released.

When the rotating shaft 26 is further rotated to about 180 degrees, the end of the side connecting portion 40 of the rotating cam 32 contacts the inclined portion 41 of the crank 34, and the rotating shaft 26 is further rotated in this contact state. When rotated, the rotating cam 32
Rotate while pressing 4. Therefore, the hook rod 36 rotates with the rotation of the rotary cam 32 and comes off the stopper plate 38. And, the rotating cam 32 is about 25
When stopped at a position rotated by 0 degrees, as shown by a two-dot chain line in FIG. Therefore, in this state, the hanging rod 36 is moved to the opening 1 of the second end plate 5.
There is no hindrance to the core frame removal operation performed from step 9.

In this state, when the rotating shaft is rotated counterclockwise in the drawing, the hanging rod 36 rotates together with the crank 34. When the rotating shaft rotates about 90 degrees, the leading end of the hanging rod 36 moves between the stopper plates 38. Then, when the rotating shaft is further rotated, the distal end portion of the hanging rod 36 is left between the stopper plates 38, and the crank 34 is rotated counterclockwise about the rotating shaft 26, whereby the pin 33 is rotated. As it descends, it gradually separates from the stopper plate 38, and when the pin 33 approaches the farthest position, the hooking portion 35 engages in the receiving groove 39 of the stopper plate 38, and becomes the clamped state as described above. Therefore, the end of the core frame 6 is fixed to the second end plate 5.

The basic clamping operation and releasing operation of the clamp member 31 are as described above.
6, a clamp member 31 is attached in the same phase.
Also, the first, second, and third rotating shafts 26a, 26b, 26c
Are connected by bevel gears 30. Therefore, when one of the rotation shafts 26 is rotated by manually rotating a handle (not shown) provided on the rotation shaft 26 or by driving a motor or the like connected to the rotation shaft 26, the first and second rotations are performed. , The third rotating shafts 26a, 26b, 26c all rotate by the same angle, and all the clamp members 31 perform the clamping operation or the releasing operation all at once, and clamp the end of the core frame 6 to the second end plate 5 It can be clamped or released by a mechanism.

The first clamping plate 7 is also provided with a similar first clamping mechanism 7, so that the rotating shaft 2
The other end of the core frame 6 is rotated by rotating the
It can be clamped or released on the wife plate 4.

As shown in FIGS. 12 and 13, the tips of both hooking rods 36, 36 of the clamp members 31 provided on the rotating shaft 26 are connected by a connecting rod 42, and are connected to the ends of the rotating shaft 26. Is connected to the base ends of the auxiliary rods 43, and a spring 44 is wound around each of the auxiliary rods 43 to urge the hooking rod 36 toward the distal end side.
6 is connected by the connecting rod 42 and can be surely rotated synchronously. In addition, when the clamp is released, the hook portion 35 is securely separated from the receiving groove 39 by the bias of the spring 44.

The second clamp mechanism 8 is provided on each of the left and right end faces of the bed 1 and clamps the end of the core frame 6 and the bed 1.
This is the same as the clamp mechanism 7. That is, the rotating shaft 45 is arranged along the end face of the bed 1 and supported by the bearing 46, and the rotating cam 47, the crank 48 and the hook rod 4 are attached to the rotating shaft 45.
9 is provided, and is hooked on a receiving groove of a stopper plate 51 provided at an end of the core frame 6.
Is configured to be able to be engaged and disengaged.

Therefore, when the rotation shaft 45 is rotated to one side, the hook rod 49 in a substantially horizontal state is moved to the rotation cam 4.
7, the upper end portion of the hooking rod 49 enters between the stopper plates 51 when the hanging rod 49 is rotated substantially vertically, and when the rotating shaft 45 is further rotated, the pin is rotated. 53 is closer to the farthest position and pulls down the hook rod 49, so that the hook 52
Are engaged in the receiving groove to be in a clamped state, and when the rotary shaft 45 rotates about 250 degrees, the pin 53 passes through the farthest position and the clamped state is stabilized. Therefore, the end of the core frame 6 is fixed to the bed 1.

When the rotating shaft 45 is rotated in the opposite direction from the clamped state, the rotating cam 47 rotates in the direction in which the pin 53 is raised, and the rising rod 49 gradually rises due to the rising of the pin 53, so that the hooking portion 52 is received. The clamp is released from the groove. Then, the rotation shaft 45 is further rotated to about 18
When rotated to 0 degrees, the end of the side connecting portion of the rotating cam 47 comes into contact with the inclined portion 41 of the crank 48. When the rotating shaft 45 further rotates in this contact state, the rotating cam 47 presses the crank 48. Rotate. Therefore, the hook rod 49 rotates with the rotation of the rotary cam 47 and comes off the stopper plate 51. Then, when the rotary cam 47 rotates to about 250 degrees, it stops, and the hooking rod 49 stops in a substantially horizontal state. Therefore, in this state, the hanging rod 49 does not hinder the work performed from the opening 19 of the second end plate 5.

The second clamp mechanisms 8 provided on the left and right end faces of the bed 1 have the same structure.

The third clamping mechanism 9 is provided at each of the left and right ends of the movable side plate 3 and clamps the ends of the first and second end plates 4 and 5 and the end of the movable side plate 3. The detailed structure is the same as that of the first and second clamp mechanisms 7 and 8 described above. That is, the rotating shaft 5 extends along the left and right side edges of the movable side plate 3.
4 are disposed and supported by bearings 55, and a stopper is provided at the end of each of the end plates 4, 5, with the rotating shaft 54 provided with three clamping members 59 each including a rotating cam 56, a crank 57, and a hook rod 58. The rod 61 hooked on the receiving groove of the plate 60
Is configured to be able to be engaged and disengaged.

Accordingly, when the movable side plate 3 is advanced to close the first and second end plates 4 and 5 and each of the rotating shafts 54 is rotated to one side, the hook rod 61 is moved together with the rotary cam 56 to the end portions of the end plates 4 and 5. Can be turned horizontally toward
When the hook rod 61 rotates until it is substantially parallel to the movable side plate 3, the tip of the hook rod 61 enters between the stopper plates 60, 60. When the rotation shaft 54 is further rotated, the pin 63 is moved to the farthest position. Approaching hook rod 6
1 is pulled toward the center of the movable side plate 3 so that the hook portion 62 is engaged in the receiving groove to be in a clamped state, and the rotary shaft 54
When the pin 63 rotates to 50 degrees, the pin 63 passes through the farthest position, and the clamped state is stabilized. Therefore, the first and second wife plates 4,
5 are fixed to the left and right end surfaces of the movable side plate 3.

When each rotating shaft 54 is rotated in the opposite direction from the clamped state, the rotating cam 56 rotates in a direction to bring the pin 63 closer to the end plate side, and the rotation of the pin 63 causes the hooking rod 61 to gradually move to the distal end side. Then, this movement causes the hook portion 62 to be disengaged from the receiving groove, and the clamp is released. When the rotating shaft 54 is further rotated to about 180 degrees, the end of the side connecting portion of the rotating cam 56 contacts the inclined portion of the crank 57. When the rotating shaft 54 further rotates in this contact state, The rotating cam 56 rotates while pressing the crank 57. Therefore, the hanging rod 61 is
6 and comes off from the stopper plate 60. When the rotary cam 56 rotates to about 250 degrees, it stops, and the hook rod 61 stops in a state substantially orthogonal to the movable side plate 3.

The third clamp mechanisms 9 provided on the left and right edges of the movable side plate 3 are symmetrical but have the same structure. As shown in FIG. 14, the third clamp mechanism 9 connects the distal ends of the hooking rods 61, 61 with a connecting rod 64, similarly to the first crank mechanism 7, and uses a spring wound around an auxiliary rod 65. May be energized.

The fourth clamp mechanism 10 is provided in the bed 1 to move the movable side plate 3 forward by clamping operation, clamp the movable side plate 3 to the bed 1, release the clamp by releasing the clamp, and release the movable side plate 3. 3 is a clamp mechanism for retracting 3.

The fourth clamping mechanism 10 shown in FIG. 6 and FIGS. 15 to 18 has a rotating shaft 66 disposed at one end inside the bed 1 along the side edge of the bed 1 and a bearing 67 fixed to the bed 1. The rotating shaft 66 is supported, and four clamp members 68 are provided in the middle of the rotating shaft 66.
Through the lower end of the movable side plate 3.

The clamp member 68 has a U-shaped cross section and one end fixed to the rotary shaft 66. The clamp member 68 is bent substantially in a C-shape so that the side surface is opened, and the other end is a pin 70. A crank 71 rotatably mounted on the other end of the rotary cam 69 by a rotating shaft 69, and a connecting shaft 72 protruding left and right.
And a connecting rod 73 having a base end fixed to the other end of the crank 71. As shown in FIG. In this state, the connecting rod 73, the rotating shaft 66 and the pin 70 are located in a straight line, or the pin 70 is The dimensions of the rotary cam 69 and the crank 71 are set so that the rotary cam 69 and the crank 71 can be stopped at the open side (upward in the figure).

In the drawing, reference numeral 75 denotes a shaft mounting bracket 75 for holding the connecting shaft 72 of the connecting rod 73 in a rotatable state, and is fixed to the lower end of the movable side plate 3. Then, as shown in FIG. 15, the connecting rod 73 is connected to the movable side plate 3 so that the pin 70 is located on the opposite side of the mounting bracket 75 with the rotating shaft 66 interposed therebetween so that the movable side plate 3 can be brought into contact with the end surface of the bed 1 and clamped. The length and the position of the shaft mounting bracket 75 are set.

Therefore, when the rotary cam 69 is rotated counterclockwise by the rotation of the rotary shaft 66, the pin 70 gradually moves away from the shaft mounting bracket 75 by this rotation, whereby the connecting rod 73 is pulled by the pin 70. 15, the movable side plate 3 is pulled toward the bed 1 side. When the pin 70 approaches a farthest position farthest from the shaft mounting bracket 75, that is, a position intersecting a line extending from a straight line connecting the connecting shaft 72 and the rotating shaft 66, the lower end of the movable side plate 3 becomes the lower end of the bed 1. When the pin 70 further rotates to the farthest position, the pin 70 pulls the connecting rod 73 most strongly to the right in the drawing, whereby a pulling force acts on the connecting rod 73, and this pulling force is applied. Clamps the movable side plate 3. Even if the pin 70 slightly passes through the farthest position, the above-described pulling force acts on the connecting rod 73, and the clamped state is continued.

In this state, even if a force in the opposite direction (left direction in FIG. 15) acts on the connecting rod 73 due to vibration or the like, this force acts as a force for rotating the rotary cam 69 in the counterclockwise direction. The cam 69 does not return to rotate clockwise and rotate. Therefore, once clamped, the clamped state is stably maintained even when subjected to vibration.

When the rotating shaft 66 is rotated clockwise from the above-described clamped state, the connecting rod 73 is pulled most when the pin 70 passes through the farthest position, so that the clamping strength is maximized at this time. When the pin 70 passes through the distant position and descends in the drawing, it gradually moves to the shaft mounting bracket 75 side. The connecting shaft 72 of the connecting rod 73 is restrained in the vertical position by a mounting bracket 75. Therefore, when the pin 70 moves toward the shaft mounting bracket 75 while descending, the connecting rod 73 gradually moves in a direction separating the movable side plate 3 from the bed 1, thereby not only releasing the clamp but also moving the movable side plate 3. Can be retracted. Then, when the rotating shaft 66 further rotates and the pin 70 rotates to about 180 degrees which is closest to the shaft mounting bracket 75, the movable side plate 3 retreats to a predetermined position.

When the rotating shaft 66 is rotated in the counterclockwise direction in this figure, the pin 70 pulls the connecting rod 73 toward the bed 1 so that the movable side plate 3 moves forward and the rotating shaft 66 is rotated.
Is rotated about 180 degrees, the movable side plate 3 comes into contact with the bed 1, and the pin 70 passes through the farthest position. Therefore, the movable side plate 3 is fixed to the bed 1.

The rotating shaft 66 may be rotated manually, or may be rotated using a driving source such as a motor.

Next, the operation of forming a box culvert using the mold having the above-described configuration will be briefly described. First, the inner surface of the fixed side plate 2, the inner surface of the movable side plate 3, the inner surfaces of the first and second end plates 4 and 5, the outer peripheral surface of the core frame 6 and the like are cleaned and a release agent is applied. And
By rotating the rotating shaft 66 of the fourth clamp mechanism 10, the movable side plate 3 is advanced until it comes into contact with the bed 1. In this state, the rotating shaft 66 is further rotated to clamp the lower end of the movable side plate 3 to the bed 1. Fix it.

After that, the first and second end plates 4 and 5 are rotated so that their free ends abut against the side edges of the movable side plate 3 to close the gap between the fixed side plate 2 and the movable side plate 3. Rotation axis 54 of
, The free ends of the first and second end plates 4 and 5 are clamped and fixed to the left and right ends of the movable side plate 3. Then, after the rebar is inserted into the inside, the core frame 6 is inserted from the openings 17 and 19 of the end plates 4 and 5, and the rotation shaft 26 of the first clamp mechanism 7 is rotated. And the base plates 4 and 5 are clamped and fixed, and the core frame 6 and the bed 1 are clamped and fixed by rotating the rotation shaft 45 of the second clamp mechanism 8.

When the clamping of each member is completed in this way, concrete is charged and vibration is applied, and then the upper surface of the concrete is leveled evenly.

When the poured concrete has hardened, the mold is moved to a predetermined position in the demolding area, and the rotating shafts of the first clamp mechanism 7 and the second clamp mechanism 8 are rotated in reverse to clamp the core frame 6. Cancel.

Next, the left and right upper surface members 23 of the core frame 6 are lowered, and the left and right side members 22, 22 are tilted inward to be crushed.
The core frame 6 is released from the molds 7 and 19.

When the removal of the core frame 6 is completed, the rotating shaft of the third clamp mechanism 9 is rotated in the reverse direction to release the clamp between the first and second end plates 4, 5 and the movable side plate 3. Then, in this released state, the first and second end plates 4 and 5 are opened by rotation, and each end plate is peeled from the end face of the product. Then, the rotating shaft 66 of the fourth clamp mechanism 10 is rotated in the reverse direction to release the clamp between the movable side plate 3 and the bed 1, and the rotating shaft 66 is further rotated to retreat the movable side plate 3 so that the movable side plate 3 Peel off from the side.

When the above operation is completed, one side surface and both end surfaces of the product are open, so that the product can be completely removed.

When the product is released from the mold in this way, each member is cleaned and a release agent is applied in preparation for the next molding. Therefore, the mold according to the present invention can be used repeatedly.

The first, second, and third clamping mechanisms 7, 8, and 9 in the present invention are not limited to the above-described embodiment, and clamp predetermined members without using bolts and nuts. Any configuration is possible as long as it is possible. The fourth clamp mechanism 10 may have any configuration as long as the movable side plate 3 can be moved forward by the clamp operation and then clamped to the bed 1 and the movable side plate 3 can be retracted by the release operation of the clamp. Also, core frame 6
The structure is not limited to the illustrated structure, and any structure may be used as long as the upper surface member can be lowered or the lower surface member can be raised and the left and right side members can be tilted inward and contracted.

[0052]

As described above, according to the present invention, when assembling the forming die, the clamping can be performed by merely operating each clamping mechanism without tightening the bolts and nuts. By performing the clamping operation of the mechanism, the movable side plate can be moved forward and the movable side plate can be clamped to the bed. Therefore, the movement of the movable side plate and the clamping can be completed by a single operation, and work efficiency can be improved. Also, when removing the mold, the mold can be separated by operating each clamp mechanism without loosening the bolts and nuts one by one, and the clamp can be released only by performing the clamp release operation of the fourth clamp mechanism. The retraction of the movable side plate can be completed by one operation. Therefore, the efficiency of the demolding operation can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a molding die in a state where a movable side plate is advanced and a rear plate is closed.

FIG. 2 is a side view of the molding die shown in FIG.

FIG. 3 is a front view of a fixed side plate.

FIG. 4 is a front view of a movable side plate.

FIG. 5 is a side view of a movable side plate.

FIG. 6 is a plan view of a fourth clamp mechanism provided in the bed.

FIG. 7 is a side view of the core frame.

FIG. 8 is a side view of the first, second, and third clamp mechanisms.

9A is a front view of the crank, and FIG. 9B is a side view of the crank.

10A is a front view of a rotating cam, and FIG. 10B is a side view of the rotating cam.

FIG. 11 is a side view of a hook rod.

FIG. 12 is a plan view of a main part of another embodiment of a clamp mechanism provided with a connecting rod, an auxiliary rod, and a spring.

FIG. 13 is a front view of another embodiment of the first clamp mechanism.

FIG. 14 is a front view of another embodiment of the third clamp mechanism.

FIG. 15 is a side view of a fourth clamp mechanism.

FIG. 16 is a plan view of a fourth clamp mechanism.

FIG. 17 is a side view of the connecting rod.

FIG. 18 is a plan view of a connecting rod.

[Explanation of symbols]

 Reference Signs List 1 bed 2 fixed side plate 3 movable side plate 4 first end plate 5 second end plate 6 core frame 7 first clamp mechanism 8 second clamp mechanism 9 third clamp mechanism 10 fourth clamp mechanism 66 rotation axis of fourth clamp mechanism 68th Clamping member of 4 clamp mechanism 69 Rotating cam of 4th clamp mechanism 70 Pin of 4th clamp mechanism 71 Crank of 4th clamp mechanism 72 Connection shaft of 4th clamp mechanism 73 Connection rod of 4th clamp mechanism 74 Crank bending space 75 Axle mounting bracket

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location E03F 3/04 E03F 3/04 Z

Claims (2)

(57) [Claims] 1. A fixed side plate erected on one side of a bed, a movable side plate erected on the other side of the bed so as to be able to move back and forth toward the fixed side plate, and rotatable at left and right ends of the fixed side plate. A first wedge plate pivotally mounted on the left and right ends of the fixed side plate, and a core frame detachably disposed between the fixed side plate and the movable side plate; The movable side plate is moved closer to the fixed side plate, a core frame is installed between the both side plates, and the end plate is closed with one end of the both ends closed by a second end plate and the other end is closed by the second end plate. A first clamp mechanism for clamping the end of the core frame, a second clamp mechanism for clamping the end of the core frame and the bed, a third clamp mechanism for clamping the movable side plate and the end plate, and movable by a clamp operation Move the side plate forward, clamp the movable side plate to the bed, and clamp by the unclamping operation. Hollow concrete mold products, characterized in that a fourth clamping mechanism to retract the movable side plate Solve. 2. A fourth clamp mechanism comprising: a rotary shaft provided along one edge of the bed; a rotary cam having one end fixed to the rotary shaft; and a pin bent at one end so that the side surface is opened. A crank pivotally attached to the other end of the rotating cam so as to be rotatable, and a connecting shaft protruding left and right at its tip,
2. A connecting rod having a base end fixed to the other end of the crank and a shaft mounting bracket fixed to a lower end of the movable side plate and rotatably mounting the connecting shaft. The mold for hollow concrete product as described in the above.