JP4033367B2 - Caisson mat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a caisson mat connected to the bottom surface of a concrete caisson. The caisson constructed for the gravity-type revetment is a rectangular body made of concrete, and a rubber plate caisson mat is mainly attached to the bottom surface.
[0002]
[Prior art]
Conventionally, in order to stabilize harbor structures and prevent disasters such as wave power and earthquakes, caisson mats are attached to the bottom of caisson constructed for gravity-type revetment. Such a caisson mat is a mat-like rubber plate that stabilizes a structure by increasing a sliding resistance with a discarded stone mound against disasters such as wave power and an earthquake. The concrete caisson 5 to which the rubber plate-like caisson mat 1 is attached is placed on a discarded stone mound 6 as shown in FIG. When building a quay, concrete caissons 5 are placed on a stone mound 6 in a row as shown in FIG. 5, for example.
[0003]
In recent years, since the caisson mat is a rubber plate and has elasticity and toughness, the coefficient of friction between the caisson and the rubble mound can be set to 0.75 or more, the structure is stabilized and the safety is improved. It has been. In addition, the caisson can be downsized, leading to cost savings.
[0004]
As shown in FIG. 6, a large number of anchor members 7 are attached to the rubber plate caisson mat. The anchor member 7 fixes the caisson mat 1 to the concrete caisson poured thereon. Various methods of attaching the anchor member 7 to the caisson mat 1 have been proposed so far, and all of them have been provided with through holes in the caisson mat and attached using bolts and nuts.
[0005]
For example, in the caisson rubber disclosed in Japanese Utility Model Publication No. 3-2044, as shown in FIG. 5, a flat and large-diameter bolt head 10 and a head cover 11 that wraps the bolt head 10 are countersunk against the rubber plate mat 12. The anchor member is screwed into the threaded portion 15 of the bolt that is fixed to the belt 13 and fixed through the nut 14 and protrudes from the surface of the caisson mat. Similarly, as a type in which a through hole is provided in a caisson mat and an anchor member is attached using a bolt and a nut or the like, for example, Japanese Utility Model Laid-Open No. 62-2000741, Japanese Utility Model Laid-Open No. The one disclosed in No. 71041 is known.
[0006]
[Problems to be solved by the invention]
As described above, the anchor member attachment method to the rubber plate caisson mat that has been proposed and adopted in the past uses bolts and nuts or the like through the through holes provided in the rubber plate caisson mat. The anchor member is attached. Such an operation is often performed on site, and in this case, it is not easy to perform alone, and this causes a reduction in workability of caisson installation. Moreover, in the method of attaching an anchor member using a bolt and a nut, there is a problem that the nut loosens after the attachment.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a caisson mat that can be easily attached by an anchor member from one side in a state where the caisson mat is arranged or stacked.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventor has intensively studied to make it possible for one person to easily attach the anchor member to the caisson mat from only one side. As a result, the present invention has been completed.
[0009]
That is, the caisson mat of the present invention is a rubber plate-like caisson mat connected to the bottom surface of a concrete caisson, and through holes are formed at appropriate locations in the rubber plate-like caisson mat. In the caisson mat in which the embedded anchor member is inserted, a spring plate nut is installed in the through hole , and a washer wider than the spring plate nut is disposed on the upper surface of the spring plate nut on the caisson side . It is characterized by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A caisson mat in a preferred embodiment of the present invention will be described with reference to the drawings.
[0011]
First, the spring plate nut used in the present invention will be described. The spring plate nut is a self-locking type that is fixed by simply pushing it into the mating shaft without cutting the groove. It is a nut that can hold parts by the spring action of an elastic material such as steel. Things are known. In the present invention, such a spring plate nut is applied to a through-hole formed in the caisson mat, and a component to be held is used as an embedded anchor member. In the conventional anchor member, the thread groove is cut as described above. However, in the present invention, the spring plate nut is installed in the through hole of the caisson mat, so that it is not necessary to cut the thread groove in the anchor member.
[0012]
FIG. 1 shows a spring plate nut that can be suitably used in the present invention. In the spring plate nut 2 shown in FIG. 1, a plurality of pleat portions 3 are provided to be inclined downward at the inner circular edge portion, and when an anchor member 7 without a thread groove is inserted into the spring plate nut 2, The pleat 3 is expanded and elastically holds the embedded anchor member 7. The anchor member 7 once inserted is elastically held by the fold portion 3 facing downward, so that it is difficult to pull it out upward, and it is possible to maintain a good connection between the caisson mat and the concrete caisson. it can.
[0013]
The location where the spring plate nut 2 is installed in the through hole of the rubber plate-shaped caisson mat 1 is preferably below the middle portion in the thickness direction of the caisson mat 1 as shown in FIG. Further, as shown in FIG. 2B, a washer 4 wider than the spring plate nut is provided on the upper surface of the spring plate nut 2, and the inserted embedded anchor member 7 is further stabilized. be able to.
[0014]
The embedded anchor member inserted into the through hole of the caisson mat 1 has an L-shaped portion embedded in the concrete, and the portion driven into the spring plate nut 2 is for easy insertion into the spring plate nut 2 The tip is preferably tapered. The material is not particularly limited, such as steel or resin.
[0015]
When the embedded anchor member 7 having a diameter larger than the diameter formed by the pleat portion 3 of the spring plate nut 2 is driven into the spring plate nut 2, the pleat portion 3 is elastically expanded in diameter, whereby the embedded anchor member 7 Is erected on the rubber plate caisson mat surface. In the method of the present invention, as described above, the anchor member 7 can be fixed to the rubber plate caisson mat 1 only by being pushed in or hammered, so that it can be easily carried out by one person alone. That is, the working efficiency is further increased and the construction cost is reduced as compared with the conventional mounting method using bolts and nuts which cannot be easily performed by one person.
[0016]
As shown in FIG. 3, after the embedded anchor member is erected, the caisson mat is laid at a designated place, and according to a conventional method, a mold is assembled thereon, and concrete is poured into the mold and solidified. To form a concrete caisson.
[0017]
The number of through holes of the caisson mat in the present invention, the shape, material and size of the embedded anchor member may be appropriately selected according to the size and shape of the caisson to be joined.
[0018]
Further, the size and thickness of the rubber plate caisson mat according to the present invention are also appropriately selected according to the size and shape of the caisson to be constructed, and are not particularly limited. For example, the length is 1000 mm, the width is A thickness of about 2000 mm and a thickness of about 30 mm is common.
[0019]
【The invention's effect】
As described above, in the caisson mat of the present invention, it is easy for one person to attach the embedded anchor member to the caisson mat from one side in a state where the caisson mat is arranged or stacked with a simple member. Therefore, it is possible to increase the work efficiency and reduce the construction cost.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred example of a spring plate nut according to the present invention.
FIG. 2 is a cross-sectional view showing a method for installing a spring nut on a caisson mat.
FIG. 3 is a perspective view of a caisson mat during attachment of an embedded anchor member.
FIG. 4 is a perspective view showing a state in which a concrete caisson to which a rubber plate caisson mat is attached is installed on a discarded stone mound.
FIG. 5 is a perspective view showing a state in which concrete caissons are disposed in a row on a stone mound.
FIG. 6 is a perspective view of a caisson mat after attachment of a conventional anchor member.
FIG. 7 is an explanatory view showing a method of attaching an anchor member to a caisson mat of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Caisson mat 2 Spring board nut 3 Folding part 4 Washer 5 Concrete caisson 6 Discard stone mound 7 Anchor member 10 Bolt head 11 Head cover 12 Rubber plate mat 13 Counterbore 14 Nut 15 Threaded part

Claims (2)

A rubber plate-like caisson mat connected to the bottom surface of a concrete caisson, wherein through holes are drilled at appropriate locations in the rubber plate-like caisson mat, and embedded anchor members are inserted into the through holes. In the caisson mat, a spring plate nut is installed in the through hole , and a washer wider than the spring plate nut is disposed on the upper surface of the spring plate nut on the caisson side .   The caisson mat according to claim 1, wherein the spring plate nut is made of an elastic material and holds the embedded anchor member by a spring action.

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