JPH0228025Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an opening device for a mold for manufacturing a hume tube, which connects a pair of half-split barrel frames to form a cylindrical shape.

The manufacturing method for humid pipes using such formwork involves putting concrete inside the formwork, rotating the formwork, and compacting the concrete into a cylindrical shape using centrifugal force or rolling pressure using rolls. There are methods to cure the product as it is and then disassemble the formwork to take out the product, or to remove the formwork after molding and cure the semi-finished hume tube, but both methods require disassembling the formwork and removing the product. It is necessary to take it out.

In this way, when removing the product from the formwork, an appropriate mold release agent is applied to the inner surface of the formwork to improve the releasability of the concrete between the inner surface of the formwork and the product.
Separating the formwork from the product requires time-consuming work such as removing the bolts that connect the flanges of the upper and lower shell frames and driving an arrow shape into the joint between the flanges. Very difficult.

This invention was made in order to solve the problems of the conventional formwork disassembly work as described above, and provides a formwork opening device that can easily remove the formwork from the product after forming the humid tube. The purpose is to

That is, the structure of the formwork opening device of this invention is a formwork for a humid pipe in which a pair of half-split bodies are connected by a plurality of connectors, and a band is fixed to the outside of each body frame constituting the formwork. A pair of levers each having an engagement hole at both ends and whose rear ends are rotatably connected by a shaft are each provided with an engagement pin that can move forward and backward to detachably engage the engagement hole of the band, and Since the opposing parts of both levers are equipped with hydraulic jacks that push both levers open, the formwork that is in close contact with the product formed by the action of the hydraulic jacks can be removed very easily. It is.

Hereinafter, embodiments of the formwork opening device of this invention will be described based on the accompanying drawings.

Reference numeral 1 denotes a formwork for producing humid pipes, and 2 a pair of upper and lower semicircular frames forming the formwork 1. Flanges 3 are fixed to both sides of each frame 2.

Each flange 3 is provided with a large number of holes at appropriate intervals, and the upper and lower body frames 2 are connected using bolts and bolts 4, such as bolts and nuts, inserted into each hole, and the form 1 is constructed into a cylindrical shape. are doing. Further, reinforcing bands 5 are fixed to the outside of each barrel frame 2 at appropriate intervals in the circumferential direction.

In the opening tool A shown in FIGS. 3 and 4, 6 and 7 are a pair of upper and lower levers, and a protrusion 8 provided downward at the rear end of the upper lever 6 is a recess formed at the rear end of the lower lever 7. It fits loosely into the slot 9 and is rotatably connected by a pin 10.

The front portion of each lever 6, 7 is composed of two pieces as shown in FIG. 4, and the band 5 of the formwork 1 is loosely fitted between the levers 6, 7.

Further, a cylinder 11 is fixed to one side of the outer end of each lever 6, 7, and an engagement pin 12 loosely fitted into this cylinder 11 so as to be able to move forward and backward is fitted into a hole in the lever 6 or 7. It is removably engaged with the engagement hole of the band 5 sandwiched between the bands 7 and 7.

Further, a spring 13 for pushing the pin 12 forward is provided in the cylinder 11, a lid 14 is screwed onto the outer end of the cylinder 11, and the rear end of the pin 12 penetrates through the lid 14 and protrudes outward. A knob 15 is provided here.

Reference numeral 16 in FIG. 3 is a hydraulic jack, which has a configuration as shown in FIG. 5. In this FIG. 5, 17 is a cylinder provided on the lower lever 7, 18 is a ram fitted into this cylinder 17, and the upper end of this ram 18 is loose in a recess 19 provided on the lower surface of the upper lever 6. It's fitted.

A hydraulic pipe 20 is connected to the lower end of the cylinder 17, and this hydraulic pipe 20 is connected to a hydraulic unit (not shown).

Knob 15 of opening tool A configured as above
While pulling the engagement pin 12 with the handle and retracting its tip, fit the upper and lower levers 6 and 7 into both sides of the band 5 of the upper and lower body frames 2, and then tighten each pin 12 with the spring 1.
3 to engage each pin in the engagement hole of the band 5 as shown in FIG.

Install a total of four opening tools, two on one side of the formwork 1 or two on each side of the formwork 1, using the method described above, and connect each cylinder 1 from the hydraulic pipe 20 of each opening tool A.
When hydraulic pressure is applied in 7, the ram 18 pushes up the lever 6.

For this reason, the upper lever 6 rotates upward about the shaft 10 and pushes up the upper frame 2 connected by the pin 12, so the upper frame 2 is removed from the product 21 in the form 1. .

Thereafter, the upper body frame 2 is removed from the product using a crane or the like, and the lower body frame 2 is also appropriately removed.

In the formwork removing device of this invention, a pair of upper and lower levers that can be pushed open by a hydraulic jack are engaged with holes in bands provided in the upper and lower shell frames using pins, and the upper and lower shells are opened by the action of the hydraulic jack. Since the frame is pushed open and separated from the product, it requires less manpower and is extremely safe compared to the conventional method of driving in arrow shapes, and since hydraulic pressure is used, the opening tool is small and lightweight. Regardless, it can exert tremendous power.

Therefore, it is ideal for opening large formworks.

[Brief explanation of the drawing]

Figure 1 is a front view with a part of the formwork for manufacturing humid pipes cut out and partially cut away, Figure 2 is a cross-sectional side view of the same as above, and Figure 3 is a state where the formwork opening tool is attached to the formwork. FIG. 4 is an enlarged partially longitudinal sectional view of the same as above, and FIG. 5 is an enlarged longitudinal sectional view of the hydraulic jack. 1... Formwork for manufacturing humid pipes, 2... Trunk frame, 3
...Flange, 4...Joiner, 5...Band,
6, 7...Lever, 10...Shaft, 12...Engagement pin, 16...Hydraulic jack.

Claims (1)

[Scope of utility model registration request] In a formwork for a humid pipe formed into a cylindrical shape by integrally connecting flanges provided on both sides of a pair of half-split shells with a plurality of connectors such as bolts, the outside of each shell forming the formwork. Engagement holes are provided at both ends of the band fixed to the band, and the front end of a pair of levers whose rear ends are rotatably connected by a shaft is provided with an engagement pin that can move forward and backward to detachably engage with the engagement hole of the band. What is claimed is: 1. An opening device for a formwork for manufacturing a hume tube, characterized in that a hydraulic jack for pushing open both levers is provided at opposing portions of the levers.