JP2000246714A - Liquid sealing structure for joint face of form for molding concrete fabricated product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the mounting and replacement of a gasket with a U-shaped section and upgrade the hermetic sealing effect and further, minimize damage to be inflicted to the gasket by providing a thin platelike lip side, slightly spaced, to a joint face on the opposite side, on one of mutually joined cavity demarcating members and fitting the gasket into the lip side. SOLUTION: Face plates 1, 2 which are cavity demarcating members demarcate a cavity 3 by bringing the end side of the face plate 1 into contact with the face plate 2. A guide plate 4 is attached to the face plate 2 by welding and thus the position of the face plate 1 in the face orthogonal direction is regulated. In addition, a gasket holder 7 is fixed with machine screws 5, 6 along the end side of the face plate 1. This gasket holder 7 is made of hoop steel with one lateral side fabricated into a thin plate form as a lip side 9 for mounting a gasket 8. Further, the lip side 9 is introduced and fitted into a U-shaped groove while the U-shaped groove of the gasket 8 with a U-shaped section is widened by pinching the holding side on the wide side of the gasket 8. Consequently, the holding side on the narrow side finds its way into a space between the lip side 9 and an adjacent wall face 15 to come into contact with the lip side 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a secondary concrete product such as a box culvert, a U-shaped groove block, an L-shaped retaining wall block, a wave-dissipating block, and a segment for a tunnel. The present invention relates to a liquid sealing structure which is provided on a joint surface between members such as a side plate and a bottom plate to prevent leakage of water and mortar from inside a mold.

[0002]

2. Description of the Related Art When mortar leaks from a joint such as a side plate and a bottom plate of a mold for forming a secondary concrete product, the cement content in the mortar is reduced, and the strength of the portion is reduced, and the skin of the product is reduced. In addition, a pattern like a Murakmo remains on the product, which significantly impairs the appearance of the product. Therefore, in order to prevent this, various gaskets are attached to the joint of the mold. The material of the gasket is natural rubber, artificial rubber, soft plastics, or the like, and these gaskets are mounted in a state of being pushed into grooves provided on the joint surface of the mold.

[0003] A mold for molding a secondary concrete product is used for molding a standardized product such as a box culvert, a U-shaped groove block, an L-shaped retaining wall block and the like. It is used in a cycle of pouring concrete into a mold twice, waiting for solidification, opening a part of the mold and taking out the product. At this time, the gasket mounted on the joint surface of the formwork is rubbed or scratched, and its performance deteriorates. If the gasket exceeds a certain limit, it must be replaced.

[0004]

In this replacement work, when removing an old gasket, since the mortar that has entered the groove is hardened around the gasket, it takes time and effort to insert a new gasket into the groove. In addition, it is necessary to perform a pre-treatment such as cleaning of the groove and application of an adhesive for preventing the groove from falling off, and furthermore, the replacement operation is considerably troublesome because the gasket does not fit in the groove smoothly.

That is, in a conventional liquid-ring structure in which a gasket having a round cross-section or a ribbon gasket having an irregular cross-section is inserted into a groove provided at a joint portion of a mold, if the cross-sectional area of the groove is increased, the gasket comes off or a concrete gap is formed. When the cross-sectional area of the groove is reduced,
It becomes difficult to mount the gasket so that the amount of protrusion (crushing allowance) of the gasket from the groove becomes constant, and liquid leakage occurs from the part where the crushing allowance is reduced, or it protrudes from the part where the crushing allowance is increased. This causes a problem that the damaged gasket is caught between the joining surfaces and is damaged.

Since the gasket is made of a rubber material, it becomes thinner when stretched, so that it can be easily installed in the groove.
If the tension is not uniform, the amount of protrusion will increase or decrease.If the fitting is attempted without stretching, the gasket will be deformed due to frictional resistance with the peripheral wall of the groove, and the amount of protrusion from the groove will also change. Will occur.

The present invention facilitates mounting of a gasket on a mold and replacement of a damaged gasket in a mold for molding a secondary concrete product, and also cleans concrete concrete that has entered the periphery of the gasket mounting portion and has solidified. It is an object of the present invention to provide a liquid-sealing structure that can be easily formed, can improve a sealing effect of a joint portion, and can greatly reduce damage to a gasket during use.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a concrete milk in a cavity provided on a joint surface between cavity defining members 1, 2, 19, 28 such as side plates and a bottom plate of a mold for forming a secondary concrete product. In the liquid sealing structure of the joint surface of the concrete secondary product molding form for preventing leakage of moisture and mortar, the cavity defining members 1, 2, 19, and 28 to be joined to each other are directed toward the mating joint surface. The above-mentioned problem is solved by providing a structure in which a thin plate-like lip side 9 having a front edge slightly separated from a mating joint surface is provided, and a gasket 8 having a U-shaped cross section is fitted to the lip side.

According to a second aspect of the present invention, in the liquid sealing structure having the above-mentioned means, the lip side 9 is separated from the wall surface 15 adjacent to the lip side 9 of the cavity defining members 1 and 19 provided with the lip side 9 by a predetermined distance. The gasket 8 provided and fitted on the lip side has a tip side pressed against the counterpart member when the defining member is joined to the counterpart member, and at least one side of the gasket 8 has the adjacent wall surface. Characterized by being pressed against. In this case, the sealing effect of the gasket is exerted on two sides, so that the sealing performance is higher than the conventional type.

According to a third aspect of the present invention, in the liquid sealing structure provided with the above means, the lip side 9 is integrally provided on the strip-shaped gasket holder 7 removably mounted on the cavity defining member 1 provided with the lip side 9. It is characterized by being carried out. For example, if the gasket holder is configured to be attached with a tap screw or the like, and the gasket is replaced and the gasket holder is removed and the work is performed, reliable work can be easily performed.

[0011]

According to the present invention, the gasket is mounted by fitting the lip side into the groove formed in the gasket, instead of fitting the gasket into the groove as in the prior art. Has a deformable space, so when the gasket is attached or when the members are joined together and the gasket is crushed, the deformation of the gasket in the direction of expanding outward is not restricted, The gasket can be easily mounted at the correct position, and the gasket is not damaged by excessive force.

As the gasket used in the present invention, a gasket having a sectional shape widely used for fixing and sealing a glass plate in the field of window sashes can be used as it is, and a gasket having a special sectional shape can be used. No new design is needed. In terms of compatibility with concrete, the hardness of the gasket material and the raw material of the material may be changed, but the mold for gasket molding should use a suitable size from the conventional cross section, There is no need to manufacture a new mold, and the effect in terms of cost is great.

Although a gasket having a U-shaped cross section is always prepared in a considerable size depending on the thickness of a target glass, a gasket for sealing a formwork for forming a secondary concrete product has dimensions as shown in FIG. Are suitable. The lip side to which it is attached can be machined or formed with a combination of thin steel plates, and the lip side formed in this way should be formed into a 90-degree bend with a moderate curve and a certain degree of roundness. A commercially available glass window gasket is also flexible enough to follow this.

According to the second aspect of the present invention, since the side of the gasket abuts on the adjacent wall surface 15 adjacent to the lip side 9, intrusion of concrete into the gasket mounting space can be prevented.
Further, according to the structure of the third aspect, there is a feature that the concrete that has entered between the gasket 8 and the adjacent wall surface 15 and solidified can be easily and completely cleaned.

[0015]

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, face plates 1 and 2 serving as cavity defining members define a cavity 3 for molding a secondary concrete product, with an end of one face plate 1 abutting on the other face plate 2. On the other face plate 2,
The guide plate 4 is attached by welding,
The guide plate 4 defines the position of the one face plate 1 in the direction perpendicular to the surface.

A gasket holder 7 is fixed along the edge of the one face plate 1 with small screws 5 and 6. This gasket holder is formed by processing one side of a strip steel material into a thin plate shape, and the portion processed into the thin plate is a lip side 9 for mounting a gasket 8. The lip side 9 can be formed by superposing and welding a wide plate material 11 and a narrow plate material 12 as shown in FIG. 2 in addition to the structure formed by machining. The gasket holder 7 is fixed such that the lip side 9 is located at a position slightly retreated from the edge 13 of the face plate 1 on which the gasket holder 7 is mounted, and on the back surface (opposite to the cavity side) of the face plate 1. When the gasket holder 7 is fixed to the back surface of the face plate 1, the lip side 9 is located at a predetermined distance 14 from the back surface, and the back surface 15 of the face plate close to the lip side is adjacent to the lip side. It becomes a wall.

FIG. 3 shows an example of a gasket 8 having a U-shaped cross section which is mounted on the lip side 9. This gasket may have the same shape as the gasket mounted on the periphery of the glass plate to be fitted into the sash frame of the window of the building. This type of gasket is U-shaped, and the width of one of the gripping sides 16 facing each other is wider than the other. When not mounted, the cross section is bent in an arc shape in a direction in which the widened side is outside. It is common to do. The gasket 8 having such a shape is formed by inserting the lip side 9 into the groove 18 while grasping the gripping side on the wide side and expanding the U-shaped groove 18.
It can be easily attached to the lip side 9.

In this mounting state, the gripping side on the narrow side enters between the lip side 9 and the adjacent wall surface 15, and the side edge contacts the adjacent wall surface 15.

When the face plate 1 is joined to the face plate 2, the tip side of the gasket 8 comes into contact with the mating face plate 2 and
Is slightly crushed. In the example shown in FIG. 1, the outer side of the gasket contacts the guide plate 4 at this time. Concrete that is about to leak to the outside through the joint between the face plates 1 and 2 is prevented by the contact between the gasket 8 and the face plate 2, and
Since the side edge of the gasket 8 contacts the adjacent wall surface 15, it is possible to prevent the gasket 8 from entering between the lip edge 9 and the adjacent wall surface 15.

FIGS. 4 to 12 show second to tenth embodiments of the liquid ring structure of the present invention. In these embodiments, the cavity defining members 19 and 28 on which the gasket 8 is mounted are formed of a honeycomb structure.
That is, the cavity defining members 19, 2
8 is a face plate 2 facing the concrete and receiving its internal pressure.
And a back plate 22 arranged at a predetermined distance from the face plate, a honeycomb core 23 sealed between the face plate 21 and the back plate 22 and bonded to the face plate and the back plate, and reinforcement provided as necessary And a frame member 24.
The gasket holder 7 having the lip side 9 for mounting the gasket 8 becomes a part of a frame member for reinforcing the face plate 21 and the back plate 22 by welding the gasket holder 7 to the face plate 21 and the back plate 22. I have.

In the example shown in FIG. 4, the periphery of the face plate 21 is bent by 90 ° toward the back plate 22 and its bent end is welded to the back plate 22, and the periphery of the back plate 22 is bent from the bent portion 25 of the face plate 21. The gasket 8 is bent toward the face plate 21 at a predetermined distance, and the bent end is a lip side 9 for mounting the gasket 8. The distal end of the gasket 8 contacts the mating member 28 to be joined, and the side contacts the outer surface of the bending portion 26 of the face plate.

In the example of FIG. 5, the bending portion 2 at the periphery of the face plate 21 is provided.
5 and a bent portion 26 on the peripheral edge of the back plate 22 are butt-welded, and a gasket holder 7 made of a steel strip material whose lip side 9 is formed by machining is welded to the back surface of the back plate 22. One side of the gasket 8 is the rear plate 2.
2 is fitted to the lip side 9 in a state of contact with the back surface.

In the structure shown in FIG. 6, a gasket holder 7 having the same structure as that shown in FIG. 5 is welded to the outside of the bent portion of the face plate 21 provided with the bent portion 29 at the peripheral edge. It is welded and fixed inside the bending portion 29 of the face plate.

In the structure shown in FIG. 7, two grooves are formed on one side surface of a thick steel strip, and a lip side 9 for mounting a gasket 8 is formed between the two grooves. . Face plate 2
1 and the back plate 22 are fixed by welding their peripheral edges to the gasket holder 7.
The inner one 30 of the grooves is narrower than the outer one 31, and the side of the gripping side inserted into the inner groove 30 contacts the side wall surface of the groove, and concrete flows into the groove. In addition, the width of the outer groove is increased so that the gasket can be deformed in the outer groove.

In the example shown in FIG. 8, the gasket holder 7 having the same structure as that described with reference to FIGS. 5 and 6 is welded to the bending portions of the face plate 21 having the bending portions 29 and 32 on the periphery and the bending portion of the back plate 22. . Further, the structure shown in FIG. 9 is a structure in which the gasket holder 7 bent into an L-shaped cross section is welded to the periphery of the face plate 21 and the back plate 22, and the lip side 9 corresponds to the side of the side facing the outside of the L-shaped gasket holder. Formed by machining,
And a face plate 2 extending to a position adjacent to the lip side
1 forms an adjacent wall surface 15.

FIG. 10 shows a gasket holder 7 having a structure similar to that described with reference to FIGS. 5 and 6 welded to the outside of a bent portion 29 provided on the peripheral edge of the face plate 21 or the back plate 22. Is welded. The structure shown in FIG. 11 is a structure in which the gasket holder 7 is welded between a flat face plate 21 and a back plate 22 having an outer peripheral edge bent in a U-shape. Further, the structure shown in FIG. 12 is a structure in which the two structures shown in FIG. 4 are welded back to back, and such a structure is such that the joint surface is defined by a cavity, such as a middle partition plate of a multi-cavity mold. This structure is used when the member is provided on both sides of the member.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of the gasket holder different from that of FIG. 1;

FIG. 3 is a diagram showing an example of a cross-sectional shape of a U-shaped gasket in cross-section.

FIG. 4 is a sectional view showing a main part of the second embodiment.

FIG. 5 is a sectional view showing a main part of a third embodiment.

FIG. 6 is a sectional view showing a main part of a fourth embodiment.

FIG. 7 is a sectional view showing a main part of a fifth embodiment.

FIG. 8 is a sectional view showing a main part of a sixth embodiment.

FIG. 9 is a sectional view showing a main part of a seventh embodiment.

FIG. 10 is a sectional view showing a main part of an eighth embodiment.

FIG. 11 is a sectional view showing a main part of a ninth embodiment;

FIG. 12 is a sectional view showing a main part of a tenth embodiment.

[Explanation of symbols]

 1 face plate 2 face plate 8 gasket 9 lip piece 15 adjacent wall surface 19 cavity defining member 28 cavity defining member

Claims (3)

[Claims] 1. A concrete secondary product forming mold having a cavity defining member (1, 2, 19, 28), such as a side plate or a bottom plate, provided on a joint surface between the cavity defining members (1, 2, 19, 28). In the liquid ring structure to prevent leakage,
One cavity defining member to be joined to each other (1, 2, 19, 28)
Is provided with a thin lip side (9) having a front edge slightly separated from the mating surface toward the mating surface, and a rubber gasket (8) having a U-shaped cross section is fitted to the lip side. A liquid sealing structure for a joint surface of a formwork for forming a secondary concrete product, characterized in that: 2. A lip side (9) is provided at a predetermined distance from a wall surface (15) adjacent to the lip side (9) of the cavity defining member (1, 19) provided with the lip side, and is fitted to the lip side. In the gasket (8), when the defining member is joined to the mating member, the tip side is pressed against the mating member, and at least one side thereof is pressed against the adjacent wall surface. The liquid sealing structure of the joint surface of the mold for molding a secondary concrete product according to claim 1, characterized in that: 3. A lip side (9) is provided integrally with a band-shaped gasket holder (7) removably mounted on a cavity defining member (1) provided with the lip side (9). A liquid sealing structure for a joint surface of the formwork for forming a secondary concrete product according to claim 1.