JPH0232123B2 - CHUKUSANKAKUBUROTSUKUNOKATAWAKUDATSUGATAHOHO - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention is a hollow triangular block mold that separates and demolds the formwork from a molded hollow triangular block while maintaining the same conditions as during concrete pouring and concrete curing. Regarding the frame demolding method, in detail, a triangular pyramid-shaped mold with corner corners is supported in an inverted state, a demolding device is inserted into the upper hollow part of the mold, and the three pieces forming the mold are passed through other hollow parts. The present invention relates to a method for demolding a hollow triangular block formwork by applying a pressing force to the outer frame of the block and safely separating three outer frames at the same time.

B. Prior Art Hollow triangular blocks are increasingly being used in embankment construction and seawall construction as they are excellent in wave-dissipating effects, stability, strength, economy, and construction suitability.

The production of this hollow triangular block involves assembling the formwork,
Concrete pouring, concrete curing, demolding of formwork, cleaning of formwork, and application of release agent are performed in this order.

Assembling the formwork consists of three outer frames to which inner frames for forming the inner hollow part forming the triangular outer surface of the hollow triangular block are fixed, and one inner frame to form the remaining hollow part. This is done using a frame. First, two people support the two outer frames using hanging hooks, and then
A person aligns the bolt holes in the ribs provided at the edge of the outer frame with a chisel, inserts the bolts, and temporarily tightens them with nuts. Next, the remaining outer frames are attached to the two outer frames in the same manner. Remove the hanging hook, check the alignment of the three outer frames, and then fully tighten the bolts. Next, a formwork consisting of three outer frames is erected in an inverted position with the apex touching the ground using a three-point hook, and supports are attached to each outer frame. After that, a worker used a crane to lift the inner frame and climbed onto the formwork, and attached the inner frame to the center of the formwork's opening.

Concrete is poured into the formwork assembled in this way from the outside of the middle frame, and the exposed surface is leveled and then the concrete is cured.

To remove the formwork, first lift the middle frame with a crane and pull it out, then hook the three-point hooks of the crane to each outer frame of the formwork to tip the formwork sideways, and then remove it. After replacing the hooks and turning the formwork upside down from when pouring concrete, remove all the bolts that connect the outer frame to other outer frames, attach a demolding machine to one of the outer frames, and start molding. One of the outer frames is separated from the hollow triangular block, and the first outer frame is safely removed from the mold using the hanging hook of the crane. Next, the position of the demolding machine is changed and the other outer frames are successively demolded.

The three demolded outer frames are rearranged and a release agent is applied to the inner surfaces in preparation for the next molding.

C. Problems to be Solved by the Invention In this way, conventionally, the hollow triangular block molded after concrete curing was left in the formwork and the formwork was overturned several times to remove the mold. Therefore, it was impossible to avoid negative effects such as damaging the formwork or causing cracks by applying a shock to the molded hollow triangular block.

Therefore, it was necessary to extend the curing period of the concrete in order to withstand falling shocks.

In addition, since demolding work is performed while overturning a large formwork, the work is not only dangerous, but also troublesome and expensive to manufacture.

D. Means for Solving the Problems In view of the above points, an object of the present invention is to provide a method for demolding a hollow triangular block formwork that can be safely and quickly demolded without overturning the formwork. shall be.

The means for achieving the above object is that in a formwork apparatus in which a formwork A assembled in the shape of a triangular pyramid is supported in an inverted state, and a hollow triangular block 4 is molded using the formwork A, Remove middle frame 3, remove middle frame 3
The demolding device B is set in the hollow portion 5 of the hollow triangular block 4 from which the mold has been removed, and the pressing force of the demolding device B is transmitted from the hollow portions 5 on the other three sides to the three outer frames 1 constituting the formwork A. However, the three outer frames 1 are simultaneously tilted in a fixed direction by the pressing force, and the hollow triangular blocks 4 are held in an inverted state regardless of whether the outer frames 1 are removed from the mold.

E. Function Formwork A with the middle frame 3 set in the center of the upper opening
When concrete is placed between the inner frame 3 and the concrete is cured, a hollow triangular block 4 is formed within the formwork A.

The middle frame 3 is lifted and removed from the formwork A using a crane.

Next, the demolding device B is set in the hollow part 5 of the hollow triangular block 4 from which the middle frame 3 has been removed, and the outer frame 1 is pressed outward using the hollow parts 5 on the other three sides to remove the hollow triangular block. Three outer frames 1 are separated from 4 at the same time.

Each separated outer frame 1 is attached to the receiving bar 21 of the apex frame 2.
It is guided by the robot and falls toward the normal position, and is cushioned by old tires and the like, and then inverted into the normal position.

At this time, the three supports 2 supporting formwork A
The upper end of the block 6 directly supports the hollow triangular block 4.

Next, the hollow triangular block 4 is lifted up by three-point hooking and separated from the vertex frame 2.

A peeling agent is applied to the inner surfaces of the three outer frames 1 and the vertex frame 2 while they are in the same state, in preparation for the next assembly.

F. Example Hereinafter, with reference to the drawings, a first example of implementing the method of the present invention will be described.
An example will be explained in detail.

A is an example of a formwork used to carry out the method of the present invention,
Three outer frames 1 forming the outer periphery of the hollow triangular block 4; and a triangular pyramid-shaped apex frame 2 that connects each outer frame 1 to form one apex of the hollow triangular block 4.
and a triangular cylindrical inner frame 3 forming the upper hollow part of the hollow triangular block 4. As shown in FIGS. 1 and 2, the apex frame 2 and three outer frames 1 form a truncated triangular pyramid shape Assemble the inner frame 3 in the center of the top opening.
This is to set the .

Each outer frame 1 forming the side circumferential outer surface of the hollow triangular block 4 has a triangular tube 6 of the same shape and size of the inner frame 3 forming the hollow part 5 of the hollow triangular block 4 inward from the approximate center of the trapezoidal plate 7. An inclined plate 9 that protrudes in the direction and forms one side of the corner 8 of the hollow triangular block 4 is provided above the trapezoidal plate 7, and also forms half surfaces of the corner 8 on both sides of the trapezoidal plate 7. Ribs 11, 11 for connecting to the side plates 10, 10 and other outer frames 1, 1 are provided in series, and a rib 1 for attaching to the apex frame 2 is provided at the bottom.
2 and 12 are arranged in series. Note that each of the ribs 11 and 12 is provided with a bolt hole (not shown).

A support frame 14 is attached to the triangular tube 6 of each outer frame 1, as shown in FIG. A ball 15 for smoothly receiving the pressing force of the demolding device B is rotatably fitted to the tip of the push rod 13 for demolding, and the rear end of the push bar 13 is fixed to the support frame 14 with a cap nut 16. has been done.

A triangular pyramid-shaped apex frame 2 located at the bottom of the outer frame 1
A triangular plate 17 has a rib 2a connected to the rib 12 of the outer frame 1 at its upper end, and a side plate 18 has a rib 2a connected to the rib 12 of the side plate 10 of the outer frame 1 at its upper end. , 18, and a ground stabilizing base plate 1 that holds the triangular plate 17 and side plates 18, 18 in an inverted state.
It consists of 9.

The rib 2a of the vertex frame 2 is formed shorter than the rib 12, as shown in FIG. The outer frame 1 and the apex frame 2 have bolt holes (not shown) in the rib 12.
The L-shaped hook 20 inserted into the rib 2a
It is connected and fixed by clamping it.

Further, above the outer surface of the triangular plate 17 of the apex frame 2, a receiving bar 21 having a bulging U-shaped tip is fixed vertically.

For this receiving bar 21, a pair of guides 22, 22 are inserted with the receiving bar 21 sandwiched between the ribs 12 of the outer frame 1.
is installed vertically, and a receiving bar 2 is installed at the bottom of the guides 22, 22.
A stopper 23 passing through the outer frame 1 is hung to prevent the outer frame 1 from separating and falling off during demolding. Note that the rib 2a of the vertex frame 2 has a guide 22,
A notch is provided for passage of 22.

Further, a hook 25 for hooking one end of a wire 24 is planted in the base plate 19 of the apex frame 2, and the other end of the wire 24 is connected to the lower end of a support 26 for supporting the formwork A. The bottom end is fixed.

The upper end of the support 26 supporting the formwork A is inserted into the outer frame 1, 1 through the notch 11a in the rib 11, 11 portion of the outer frame 1, 1, as shown in FIG.
A receiving plate 27 is loosely fitted to support the hollow triangular block 4 formed at the tip in a stable state during demolding, and a cover 28 is inserted to cover the notch 11a. A pin 29 is used to prevent the cover 28 from falling off, and is removably inserted into the upper end of the support 26.

Next, the demolding device B simultaneously removes the three forms A in which the hollow triangular blocks 4 have been molded, and as shown in FIG. is rotatably installed, and a cone 3 that comes into contact with the ball 15 of the push rod 13 is attached to the screw rod 32.
3 are screwed together, and a rotational drive mechanism 34 for rotating the threaded rod 32 is attached to the machine frame 31 with a bracket 35, and guides 36, 36 for preventing rotation of the cone 33 are implanted in the cone 33, penetrating the bracket 35. It is something. The outer peripheral tapered surface of the cone 33 is parallel to the support frame 14 of the outer frame 1 and is perpendicular to the push rod 13, so that the pressing force accompanying the descent of the cone 33 is effectively applied to the balls 15 and push rods 18 of each outer frame 1. It is designed so that each outer frame 1 can be pressed outward and the three outer frames 1 can be removed from the mold at the same time.

The demolding device B does not rely on the cone 33 and the push rod 13, but instead has a hydraulic cylinder 37 installed in the center of the machine frame 31, and three pistons 38 at the bottom of the hydraulic cylinder 37, as shown in FIG. are arranged to move forward and backward, and when demolding, the piston 38 is advanced into the triangular cylinder 6 of the outer frame 1, and the head 39 of the piston 38 is moved forward and backward.
may be brought into contact with the support frame 14 of the outer frame 1, and the outer frame 1 is pressed outward to remove three pieces of the outer frame 1 at the same time.

The following procedure is used to mold the hollow triangular block 4 using such a mold A and to remove the mold A.

(a) Assembling the formwork Three outer frames 1 are sequentially connected on top of the apex frame 2 with hook bolts 20, and ribs 11, 11 of adjacent outer frames 1, 1 are connected with bolts and nuts.
Incorporate the middle frame 3 in the center of the top surface.

(b) Placing concrete and curing concrete Pour concrete into formwork A from around the middle frame 3, level the top surface, and allow the concrete to cure for a certain period of time.

(c) Demolding the formwork After the concrete has cured for a certain period of time, the middle frame 3 is lifted up by a crane and removed.

Next, the demolding device B is set in the hollow part 5 of the hollow triangular block 4 in which the middle frame 3 was assembled.

When the demolding device B is set, the lower end of the cone 33 of the demolding device B comes into contact with the ball 15 of the push rod 13, as shown in FIGS.

At this time, remove the bolts that connected the ribs 11, 11 of the outer frames 1, 1, loosen the hook bolts 20 that connected the outer frames 1 and the apex frame 2, and rotate the hook bolts 20. Vertex frame 2
release the locked state from the rib 2a.

Next, the rotation drive mechanism 34 is driven to rotate the screw rod 32.
When rotated in the normal direction, the cone 3 screwed into the screw rod 32
3 descends and presses the ball 15 of the push rod 13. When the balls 15 are pressed, each outer frame 1 is pressed outward via the push rods 13. When each outer frame 1 is pressed outward, the three outer frames 1 and the molded hollow triangular blocks 4 are simultaneously separated and demolded, as shown in FIG.

As shown in FIG. 3, each separated outer frame 1 is guided by the guides 22, 22 of the outer frame 1 to the receiving bar 21 fixed to the triangular plate 17 of the apex frame 2, so that the stopper 23 is prevented from swinging laterally. Receiver bar 2
It falls down while being held in contact with the inside of the tip of 1.
If necessary, place old tires, old wood, etc. as a cushioning material at this fixed position where it will fall.

Even if each outer frame 1 is separated from the hollow triangular block 4, the upper end of the support 26 supports the hollow triangular block 4 via the support plate 27, so the hollow triangular block 4 remains with its apex inserted into the apex frame 2. Supported in an inverted position.

In this state, next, the hollow triangular block 4 is lifted up with a three-point hook using a crane and separated from the apex frame 2.

Although the hollow triangular block 4 is molded through the above steps, the cleaning and application of a release agent to the inside of the outer frame 1 and apex frame 2 necessary for remolding are carried out in the demolded state.

G. Effects of the Invention As described above, the present invention can perform everything from assembling the formwork A to pouring concrete and removing the mold while supporting the formwork A in an inverted state, so there is no possibility of damaging the formwork A or the molded hollow triangular block 4. Therefore, the curing period of concrete can be relatively shortened. Moreover, demolding work can be carried out safely and quickly, and production costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the formwork A, Fig. 2 is a schematic perspective view of the inner frame 3 removed from the mold, Fig. 3 is a schematic perspective view of the outer frame 1 removed from the mold, and Fig. 4 is a schematic perspective view of the formwork A removed. 5 is a schematic enlarged sectional view showing the relationship between the mold device B and the push rod 13, FIG. 5 is a schematic enlarged sectional view showing the relationship between the outer frame 1 and the triangular plate 17 of the apex frame 2, and FIG.
FIG. 7 is a cross-sectional view of the hollow triangular block 4 in a molded state, and FIG. 8 is a cross-sectional view showing the state in which the cone 33 of the demolding device B and the ball 15 of the push rod 13 are in contact with each other. , FIG. 9 is a cross-sectional view showing the state in which the cone 33 is lowered and the outer frame 1 is expanded;
The figure is a sectional view showing another example of demolding means, and FIG. 11 is a perspective view of a molded hollow triangular block 4. Main symbols in the diagram: A...Formwork, B...Mold removing device,
1...Outer frame, 2...Vertex frame, 3...Middle frame, 4...
Hollow triangular block.

Claims (1)

[Claims] 1. In a formwork device that supports a formwork A assembled in the shape of a triangular pyramid in an inverted state and molds a hollow triangular block 4 with the formwork A, the middle frame 3 assembled on the top surface is removed, and the middle frame 3 is removed. A demolding device B is set in the hollow portion 5 of the hollow triangular block 4 that has been extracted, and the pressing force of the demolding device B is transmitted from the hollow portions 5 on the other three sides to the three outer frames 1 constituting the formwork A. A method for demolding a formwork of a hollow triangular block, characterized in that three outer frames 1 are simultaneously pushed down in a fixed direction by the pressing force, and the hollow triangular block 4 is held in an inverted state regardless of whether the outer frame 1 is demolded. .