JPS6011177Y2 - Concrete formwork vent pipe - Google Patents

Description

[Detailed description of the invention] This invention is based on a formwork segment 9 consisting of side plates 6, 6, end plates 7, and outer circumferential plate 8. openings 2 at both ends of the double tube 1;
2 is a concrete formwork vent pipe formed by edges 3 obliquely intersecting the central axis a of the intermediate pipe 1, respectively.

The edges 3, 3 can be sloped in opposite directions (FIG. 4), in the same direction (FIG. 5), chevron-shaped (FIG. 6), or in opposite directions (FIG. 7).

The material for the 0-shaped tube 1 is preferably formed by heating and bending the center part of a short hardened vinyl chloride tube, but it may also be made of metal.

In this project, a groove was excavated and Huyume pipes 4 and 4 were inserted into the groove.
In order to connect the joints 4' in an annular manner with cement concrete, steel flanges 5, 5 are attached to the outer peripheries of opposite ends of the hume pipes 4, 4, respectively, and fan-shaped side plates 6, 5 are attached along the outer peripheries of the flanges 5, 5. 6. A plurality of formwork segments 9 consisting of end plates 7 and outer peripheral plates 8 are attached to form an annular formwork 10.

Then, the opposing end plates 7, 7 of the adjacent segments 9, 9 are
It is held between two tubes 1, and both ends thereof are in contact with the outer circumferential plate 8.

Further, the O-shaped tube 1 is inserted from the inner peripheral edge of the required side plate 6 into the inside and outside of the same side plate 6, so that one end of the side tube 1 is exposed to the outside of the segment 9.

In this state, cement mortar is injected or press-fitted into the annular formwork 10.

This injection mortar fills the annular formwork 10 from the bottom to the top, and removes the air remaining at the boundary between the end plate 7 and the outer peripheral plate 8 from the opening 2 at one end of the tube 1 to the opening 2 at the other end. extrusion,
Mortar enters from the opening 2 at one end and flows out from the opening 2 at the other end, so that no air remains inside the pipe 1.

When mortar attempts to enter both end openings 2, 2 at the same time, the mortar moves from the larger entrance to the smaller one, and no air remains in the interpipe 1.
The above difference in inlet pressure can be achieved by providing the mortar injection port on the left or right side of FIG.

When the mortar is filled along the outer circumferential plate 8, the mortar flows out from the opening 2 at one end of the O-shaped tube 1 that appears on the outside of the side plate 6. The air remaining inside the segment 9 is carried out by the mortar injection pressure to the outside from the opening 2 at one end of the O-shaped tube 1 provided at the top. It can be seen that the upper part of the upper segment 9 is filled with mortar.

Since the present invention is constructed as described above, it can be used appropriately in the air remaining portion of a cement concrete formwork, and has the practical advantage of evacuating air and properly forming concrete using the formwork.

[Brief explanation of the drawing]

Figure 1 is a front view showing the usage status of the proposed concrete formwork vent pipe, Figure 2 is a longitudinal cross-sectional side view taken along line A-A in Figure 1,
FIG. 3 is a perspective view of the trachea in use, FIG. 4 is a perspective view of the trachea, and FIGS. 5, 6, and 7 are perspective views of the other side of the trachea. 1...U-shaped tube, 2...Both end openings, a
...Central axis line, 3 ... Edge, 6 ...
... Side plate, 7 ... End plate, 8 ... Outer plate, 9 ... Formwork segment.

Claims (2)

[Scope of utility model registration request] (1) In the formwork segment 9 consisting of the side plates 6, 6, end plates 7, and outer circumferential plate 8, openings at both ends of the O-shaped tube 1 that can be inserted toward the outer circumferential plate 8 along both sides of the side plates 6 or end plates 7 Part 2,
2 are formed by edges 3 that obliquely intersect with the center axis a of the intermediate pipe 1. (2) The concrete formwork vent pipe according to claim 1, wherein the 0-shaped pipe 1 is made of vinyl chloride.