JP3022310B2 - Joint material for caisson - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of a concrete or steel caisson, such as a dike, for forming a dike. To a joint material to be interposed.

[0002]

2. Description of the Related Art When a caisson, which is a concrete box, is used for revetment, embankment construction, etc., as a joint material vertically interposed between joints formed between end faces of adjacently arranged caissons. And Japanese Patent Publication No. 3-79488.

[0003] This is to form a foldable portion in which the lower end of a deformable flat cylindrical body is folded upward, and the end portion is overlapped to close the bottom portion so that the bottom portion can be enlarged. The folded portion at the upper end is removed to form a folded portion side portion.

According to this structure, when the inside of the cylindrical body is filled with the filler and the internal pressure is applied, the fold at the lower end portion protrudes outward and expands, and the contact area of this portion is increased to form the seal portion. Can be increased. As a result, even if the shape of the joint changes due to tightening, subsidence, vibration due to waves, displacement due to waves, extrusion due to earth pressure, etc. after installation of the caisson, the movement of the bottom of the caisson is followed, and a gap is formed at the bottom of the caisson. It is possible to prevent inundation and outflow of sediment and the like (filled material inside) on the landfill side due to the occurrence.

[0005]

However, in the above-mentioned conventional structure, the ability to follow the gap formed below the joint portion when the adjacent caissons are relatively displaced vertically is insufficient. In particular, as shown in FIG. 16 which is a vertical cross-sectional view, when the caisson 1 on which the joint material 4 is mounted is relatively displaced downward with respect to the adjacent caisson 2, C in FIG. As shown in FIG. 17, which is a cross-sectional view of FIG.
As shown in FIG. 18 which is a cross-sectional view of FIG. 18, the expansion of the bottom is restricted by the base 3 of the adjacent caisson 2 located on the upper side. 5 are generated, and there is a problem that water is infiltrated into the caisson through the gap 5 and an outflow of the internal filling occurs.

The present invention has been made in view of the above-mentioned problems of the prior art. Even when an adjacent caisson is displaced up and down relatively, the caisson expands following the shape of the underground end of the eye and creates a gap. It is intended to provide a joint material for caisson without any.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a joint material for caisson according to the present invention is provided in a joint formed between end faces of adjacently arranged caissons. A bag-like member is integrally joined to a lower end of a hollow cylindrical body having an opening for filling a filler at an upper end with an elastic material in a state of being concavely fitted in the hollow portion. In addition, a swelling permitting portion for allowing the bag-shaped member to swell to the front side is formed at a front edge of a lower end of the tubular main body.

The bulging portion is a notch of a predetermined size formed at a front edge of a lower end of the cylindrical body.

The bulging portion is provided with a protection member for covering the notch, and the protection member is formed with a vertical fold for facilitating deformation in the horizontal direction. It is characterized by the following.

[0010] Further, the protection member is characterized in that the tubular main body is extended.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of one embodiment of a caisson joint material according to the present invention, FIG. 2 is a front view of a lower end portion, and FIG. 3 is a side view of a lower end portion.

The joint material 10 for a caisson shown is a front plate 11A which is parallel and spaced apart by a predetermined distance such that a cylinder having a predetermined thickness is crushed in a radial direction by an elastic material such as synthetic rubber or synthetic resin. The main body 11 as a cylindrical main body is formed in a shape in which both sides of the back plate 11B are connected in an arc shape, and the back plate 11B has a plate-like shape extending left and right on both sides on the back side. The mounting flange 12 is formed so as to protrude with a predetermined width.

The length is set substantially equal in the longitudinal direction of the caisson, and is fixed to the end face of the caisson via the mounting flange 12. A reinforcing cloth is embedded in the tubular main body 11 as necessary.

At the lower end of the main body 11, an inner bag 13 as a bag-like member is provided so as to be joined and integrated into the hollow portion, and the lower end opening is closed by the inner bag 13. ing.

The inner bag 13 is tapered and has a predetermined depth and is formed of a material having elasticity similarly to the main body 11, and has an opening edge joined to a lower end opening edge of the main body 11. Have been. The inner bag 13 and the main body 11 are
After being formed separately, they may be joined or integrally formed.

A cutout portion 14 is formed at the lower end edge of the front side of the main body portion 11 (the side that comes into contact with an adjacent caisson) as a swellable portion.

The notch 14 is formed by cutting the front surface of the main body 11 into a rectangle having a width of the front plate 11A and a predetermined depth in the longitudinal direction, and also cutting the inner bag 13 into a corresponding shape. The main body 11 and the inner bag 13
4 are joined at the edge.

The joint material 10 for caisson constructed as described above.
As shown in FIG. 4 which is a longitudinal sectional view, the caisson 1 is fixed to the end face of the caisson 1 by the mounting flange 12, and the caisson 1 and the caisson 2 adjacent thereto are arranged at a predetermined joint interval. Is filled with a filler 20 such as coarse sand, asphalt mastic, or the like from the upper end opening in the hollow portion. As a result, the main body 11 bulges in a circular direction due to the filling pressure of the filler 20, and the front surface thereof is pressed against the end surface of the adjacent caisson 2 to be in close contact therewith.

As shown in FIG. 4 and FIG. 5, which is a view taken along the line AA of FIG. 5, the inner bag 13 is also pressed by the filler 20 to be inverted and pushed downward from the lower end of the main body 11. At the same time, it bulges forward from the cutout portion 14 on the front surface of the lower end, and comes into pressure contact with the upper surface of the cobblestone of the foundation 3 and the end surface of the adjacent caisson 2.

After the construction, the foundation and ground are tightened,
When the caisson 1 adjacent to the caisson 1 to which the joint material 10 is attached (the caisson 2 to which the joint material 10 is pressed) is relatively displaced to the side where the joint width is widened due to vibration, displacement due to waves, extrusion by earth pressure, or the like. , FIG. 6 and FIG.
As shown in FIG. 8, the main body 11 expands due to the pressure of the filler 20 and widens as shown in FIG. At the basement of the eye, the inner bag 13 bulges downward, of course.
The bulging forward through the notch 14 prevents a gap from being formed between the base 3. Even when the caisson 1 and 2 are displaced in the vertical direction, the inner bag 13 bulges forward through the notch portion 14 to flexibly correspond to the step of the foundation 3 and maintain a close contact state. can do. Therefore, no gap is formed at the lower end of the joint, and it is possible to prevent flooding and outflow of the filling material from the formed gap.

Also, before construction, the caisson 1 and the caisson 2 adjacent to the caisson 2 are widened even when they are displaced relative to each other as shown in FIG. 6, thereby preventing a gap between the caisson 2 and the foundation 3 as shown in FIG.

Next, another embodiment of the present invention whose overall perspective view is shown in FIG. 9 will be described. The parts having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the illustrated joint material 10 ', an inner bag 13 is provided at the lower end of the main body 11 similarly to the above-described embodiment, and the main body 11 is extended to the lower end without being cut off. A folded portion 15 is formed at the front side edge corresponding to the notch 13A. That is, the main body 11
The lower edge of the inner bag 13 is formed horizontally, but the lower edge of the front side of the inner bag 13 is cut out upward and joined to the main body 11 at the lower edge. The folding part 15 is formed in the main body part 11 located on the front side.

That is, in the present configuration, the notch 13A of the inner bag 13 and the folded portion 15 of the main body 11 constitute a bulging-allowing portion, and the notch 13A of the main body 11 located in front of the notch 13A of the inner bag 13 is formed. The folding part 15 constitutes a protection member.

The folded portion 15 is formed by forming a plurality of folds 15A along the longitudinal direction at predetermined intervals on the front plate 11A of the main body 11.

As shown in an enlarged view of FIG. 10, the fold 15A has a wedge-shaped cross section directed inward, and
Is formed in such a manner that the width of the lower end and the penetration amount are the largest and the cross-sectional shape becomes smaller as going upward.

The folded portion 15 having the above configuration can be easily expanded and deformed by expanding the fold 15A. As a result, it does not prevent the inner bag 13 from bulging forward.
It does not impair the ability of the inner bag 13 to follow the gap formed at the lower end of the joint, and acts to cover and protect the front side of the inner bag 13. In addition, from the viewpoint of protection of the inner bag 13, the folded portion 15 may be any as long as it can cover the front surface of the inner bag 13 without being continuous with the main body 11.
Further, the shape of the fold 15A is not limited to this, and the inner bag 1
What is necessary is just to be able to allow the bulging of No.3.

The joint material 10 'of this construction is also fixed to the end face of the caisson 1 by the mounting flange 12 similarly to the above-described embodiment, and the caisson 1 and the adjacent caisson 2 are arranged at a predetermined joint interval. After that, as shown in FIG. 11 which is a longitudinal sectional view, the hollow portion of the main body 11 is filled with a filler 20 such as coarse sand or asphalt mastic from the upper end opening, and the filling pressure of the filler 20 is applied. Body part 11
Bulges in the direction in which it becomes circular, and the front surface of the main body portion 11 is pressed against the end surface of the adjacent caisson 2 to come into close contact therewith. As shown in FIG. 11 and FIG.
The main body 11 is inverted by being pressed by the filler 20.
Is pushed downward from the lower end of the base 3 and pressed against the upper surface of the foundation 3, and the folded portion 15 on the front surface is pushed forward and pressed against the end surface of the adjacent caisson 2.

FIG. 3 is a longitudinal sectional view showing a case where the adjacent caissons 1 and 2 are relatively displaced due to tightening of the foundation and the ground, settlement of the ground, vibration due to waves, displacement, extruding due to earth pressure, etc., and the joint width is widened. FIG. 13 and FIG. 14 which is a plan view thereof.
As shown in FIG. 15, the main body 11 expands and widens due to the pressure of the filler 20 to prevent the generation of a gap as shown in FIG. At the bottom of the eye, the inner bag 13 bulges downward, and the inner bag 13 bulges forward through the notch 13A.
Prevents a gap from being formed between the foundation 3 and the caisson 1,
Even when a relative displacement in the vertical direction occurs in the base 2, the close contact state is maintained flexibly corresponding to the step of the foundation 3. For this reason, it is possible to prevent infiltration and outflow of the filling material inside without generating a gap, and there is no fear of breakage of the inner bag 13 because the front surface of the inner bag 13 is covered by the folded portion 15. The durability can be high.

Before construction, the caisson 2 adjacent to the caisson 1 widens even when it is displaced relative to each other as shown in FIG. 13 to prevent the gap between the caisson 2 and the foundation 3 as shown in FIG.

[0031]

As described above, according to the joint material for caisson according to the present invention, even when the adjacent caissons are relatively displaced up and down, the bag-shaped member provided at the lower end is allowed to pass through the bulging allowance. By bulging forward, it is possible to flexibly correspond to the shape of the underground end portion of the eye, without forming a void portion, and it is possible to prevent flooding and outflow of the filling material inside.

Further, in a configuration in which the lower end edge of the upper cylinder body is cut out to form a bulging-allowed portion, by providing a protection member for covering the notch, the protection member prevents the inner bag from being damaged and is durable. The performance is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a caisson joint material according to the present invention.

FIG. 2 is a front view of a lower end portion of FIG. 1;

FIG. 3 is a side view of a lower end portion of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a construction state.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a process of following a displacement of a caisson.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a longitudinal sectional view showing a state where the caisson is displaced.

FIG. 9 is a perspective view of another embodiment.

FIG. 10 is an enlarged view of a folding part.

FIG. 11 is a longitudinal sectional view showing a construction state.

FIG. 12 is a sectional view taken along line BB of FIG. 11;

FIG. 13 is a longitudinal sectional view showing a process of following the displacement of the caisson.

FIG. 14 is a plan view of FIG.

FIG. 15 is a longitudinal sectional view showing a state where the caisson is displaced.

FIG. 16 is a longitudinal sectional view of an underground end of a conventional caisson when the caisson is displaced.

FIG. 17 is a sectional view taken along the line CC in FIG. 16;

18 is a sectional view taken along line DD of FIG.

[Explanation of symbols]

 1, 2 caisson 3 foundation 10, 10 'jointing material (joining material for caisson) 11 main body part (cylindrical main body) 13 inner bag (bag-like member) 14 notch part (bulging allowable part) 15 folding part (protection member) )

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Claims (3)

(57) [Claims] 1. A joint material vertically interposed between joints formed between end faces of caissons arranged adjacent to each other, the joint material being formed into a hollow shape having an opening for filling a filler at an upper end by an elastic material. At the lower end of the formed cylindrical main body, a bag-shaped member is integrally joined and provided in a concavely fitted state in the hollow portion, and at the front lower edge of the lower end of the cylindrical main body, the front side of the bag-shaped member is provided. A swelling permitting portion for allowing swelling is formed ,
The bulging portion is formed at a front edge of the lower end of the cylindrical body.
Characterized in that it is a notch of a predetermined size . 2. The swelling permitting portion is provided with a protection member for covering the notch, and the protection member is formed with a vertical fold for facilitating the deformation in the horizontal direction. caisson for joint compound according to claim 1, characterized in that. 3. The joint material for caisson according to claim 2 , wherein the protection member is configured by extending the tubular main body.