JPH0346286B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to formwork for long products that automates assembly and demolding, and is mainly used for long precast concrete products such as reinforced concrete and prestressed concrete girders, beams, and slabs. Regarding formwork for manufacturing.

[Prior Art] In general, formwork for manufacturing concrete products is assembled and demolded by inputting inputs using fasteners such as bolts and nuts and bolts on formwork members.

Formwork for long precast concrete products manufactured in factories or production yards, such as reinforced concrete and prestressed concrete girders, beams, and slabs, is no exception; the formwork is moved by a crane and assembled using bolts, nuts, etc. There is.

[Problem that the invention seeks to solve]

Among these precast concrete formworks, for relatively small-scale mass-produced concrete product manufacturing formworks, forms have been developed that use a lever system or the like to assemble and remove the formwork in one operation. However, formwork for large and long concrete products has not yet been realized.

The present invention was developed in view of the above-mentioned circumstances, and an object of the present invention is to provide a formwork for a long product in which assembly and demolding are automated.

[Means for solving problems]

The present invention is applied to a formwork for a long precast product having a bottom plate and both side plates, and includes the following technical means.

In a formwork for long products that is equipped with a bottom plate and frames on both sides, (1) one side frame is attached so that it can be tilted laterally around a pin joint attached to the lower frame, and (2) the other side frame is , the lower end bottom surface is in close contact with the upper surface of the end of the bottom plate, and the side frame is tiltably connected with a pin to a bracket protruding from a cart that can be retracted by remote operation from the side of the bottom plate, and the side frame is tilted outward. an actuator is provided on a trolley, (3) the form frame is provided with a receiving part having a positioning recess of the same shape into which the bracket is fitted, and (4) when the bracket is fitted into the positioning recess, the bottom surface of the side frame is placed in close contact with the upper surface of the bottom plate of the formwork, and (5) is characterized by being equipped with a fluid pressure device that operates the entire side frame at the same time.

[Effect]

The formwork of the present invention has the following functions.

(a) Side frame assembly and demolding of long precast formwork can be performed all at once using fluid pressure.

(b) Significant labor savings.

(c) Particularly suitable for large precast formwork that is used repeatedly.

〔Example〕

A plan view of an embodiment of the formwork of the present invention is shown in FIG. 2, its AA arrow view is shown in FIG. 1, and the BB arrow view is shown in FIG. 4. FIG. 3 is a partially enlarged view showing details of section C in FIG. 1.

The formwork 1 has a width of 600 to 1500 mm and a length of about 15 to 30 m, and includes a bottom plate 2 and side frames 3a and 3b. The side frames 3a and 3b are connected to a rocker arm 6 by an actuator 4 as shown in FIG.
Rotate around pin 6a, and
The tip of the side frame 3a is pressed against the lower end of the side frame 3a, and the bottom surface of the lower end of the side frame is brought into close contact with the upper surface of the bottom plate 2, and a seal portion is formed at this close contact portion.

The side frames 3a, 3b are provided with actuators 5a, 5b for tilting the side frames outward as shown by arrows 8. The appropriate tilt angle of this side frame is 15 degrees to 45 degrees.

Further, one of the side frames 3b is tilted as shown by the arrow 8 by the actuator 5b, and then the trolley device 9 moves forward and backward as shown by the arrow 10, thereby allowing the work to be carried out between the bottom plate 2 and the side frame 3b. This allows personnel to enter and perform various tasks easily. As shown in FIG. 3, the side frame 3b and the truck 9 are connected by a pin 12 of a bracket 11, and the mounting portion of the pin 12 of the bracket 11 is attached to the formwork bottom plate frame as the truck 9 moves forward. It fits into the recess 14 of the metal holder 13.

The shape of this recess 14 is the same as the outer shape of the pin attachment part of the bracket 11, and when the trolley device 9 is advanced toward the formwork 1 and pressed, the pin 12
to locate it in the appropriate position. This proper position is a position where the bottom surface of the lower end of the side frame 3b comes into close contact with the top surface of the bottom plate when the actuator 5b pushes the side frame 3b up from the tilted position to the formwork upright position.

As is clear from FIG. 1, the actuator 5
b is mounted on the trolley device 9 and connected near the upper end of the side frame 3b to tilt the side frame 3b. Naturally, therefore, the bottom surface of the lower end of the side frame 3b, which is close to the pin 12, is strongly pressed against the top surface of the bottom plate due to the "lever" principle. Since the pressing force acts in the vertical direction, regardless of the size of the lateral pressing force of the trolley device, the sealing performance between the lower surface of the side frame and the bottom plate is significantly improved, and paste does not leak from the joint between the side plate and the bottom plate. . This completely eliminates the disadvantage that when pressing the side frame against the side surface of the bottom plate for sealing, a large number of carriage devices must be provided at short pitches and forceful pressing must be performed.

In a formwork with a bottom plate width of 1 m and a side frame height of about 1 to 1.5 m, the actuators 4 should be installed at a pitch of about 2.4 m, and the actuators 5a, 5b and the evacuation trolley device 9 should be installed at a pitch of 3.6 m to 7.2 m. That's fine.

FIG. 5 shows an example of a formwork in which the side frame 3a is a low-height formwork, such as a formwork for a concrete slab, and the actuator 4 for pressing the lower end of the side frame is attached to the side of the embodiment shown in FIGS. 1 to 4. This is an example in which it is also used as the frame tilting actuator 5a. In such a low-height formwork, the side frame 3a is fixed to the rocker arm 6, and the side frame can be tilted together with the rocker arm as shown by arrow 15.

One side frame 3a of a 20.4 m long prestressed concrete girder manufacturing form is equipped with four air cylinders as actuators 5a for tilting the side frame by 30 degrees, and the other side frame 3b is equipped with four trolleys. Device 9
and the actuator 5b mounted thereon respectively.
A formwork was prepared in which the left and right side frames each had nine air cylinders as the actuator 4 for pressing the lower ends of the left and right side frames. By using electromagnetic valves to remotely control the compressed air supplied to each air cylinder, this formwork allowed assembly and demolding of the side frames to be performed remotely in one operation, greatly contributing to labor savings. The device of the present invention eliminates the need for conventional wedges and bolts and nuts, and eliminates the need for hammering, resulting in labor savings and noise reduction. In addition, an overhead traveling crane was previously used to assemble and demold the side frames, but this is no longer necessary, and the overhead crane can be used for other tasks. Therefore,
Work efficiency has been improved, and in one example, the production efficiency of prestressed concrete girder PHH119 (13.1t/piece) has been reduced by 50% from 4.1t/piece to 6.6t/piece.
This resulted in more efficiency improvements.

〔Effect of the invention〕

According to the present invention, in the formwork for large-sized long precast concrete products, the formwork assembly, demolding, and side frame retraction can be performed simultaneously in one operation by operating a solenoid valve, which greatly contributes to improving efficiency and reducing labor. It is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention (A-A arrow view in FIG. 2), FIG. 2 is a plan view thereof, FIG. 3 is a partially enlarged view of section C in FIG. Figure 4 is B in Figure 2.
-B arrow view and FIG. 5 are explanatory diagrams of another embodiment. 1... Formwork, 2... Bottom plate, 3a, 3b... Side frame, 4, 5a, 5b... Actuator, 6...
Rotzker arm, 8, 10, 15...arrow, 9...
...Dolly device.

Claims (1)

[Scope of Claims] 1. In a formwork for a long product that includes a bottom plate and both side frames, one side frame is attached so as to be tiltable laterally around a pin joint attached to the lower frame, and the other side frame The dolly is equipped with an actuator on the dolly that is pin-coupled to a bracket protruding from a dolly that can be retracted laterally by remote operation, and tilts the side frame outward, and the bracket is fitted into the form frame. a metal holder having a positioning recess of the same shape, the other side frame has a shape such that the bottom surface of the side frame is in close contact with the upper surface of the formwork bottom plate when the bracket is tightly fitted into the positioning recess, and the entire side frame A formwork for long products that automates assembly and demolding, characterized by being equipped with a fluid pressure device that operates simultaneously.