JPH1193131A - Friction increasing mat for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to maintain good deformation of a mat reused by preventing small stone or the like from being caught and remained on the bottom surface of the mat when reusing the friction-increasing mat for ocean structure or the like. SOLUTION: A sheet-shaped member 12 such as a rubber sheet is arranged on the bottom surface and side surface of an asphalt mat 10 as in one united body, and the asphalt mastic of the upper and lower layers 10a, 10b and an internal reinforcing member 11 are placed and arranged. If these are constructed as the friction-increasing mat for installing a caisson 1 on the top of foundation mound 15, even though a bump 16 of a large stone or a small stone is or the like is caught, the direct contact and adhesion between the stone and the asphalt can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction increasing member disposed on the bottom of a structure such as a caisson and, more particularly, to a base mound which can be used when an asphalt mat is used for a short time and then reused in another place. The present invention relates to a mat for increasing friction of a structure which has been treated so that small stones and the like do not adhere to and remain on the mat.

[0002]

2. Description of the Related Art When constructing a marine structure such as a breakwater or a quay, a foundation mound is constructed on a seabed, and a mat such as an asphalt mat is laid on the foundation mound. The caisson, etc., which constitutes the structure, is installed above. The asphalt mat is used as a friction increasing member on a foundation mound of a marine structure, and even if there are some irregularities on the surface of the foundation mound, the mat is deformed with respect to the irregularities. The bottom surface of the asphalt mat does not have any irregularities on the top surface thereof, so that the support function can be favorably exhibited. As the asphalt mat, for example, a structure shown in Japanese Patent Application Laid-Open No. 8-27759 is known.

A marine structure using a general asphalt mat is installed as shown in FIG. 6. In the example shown in FIG. 6, a foundation mound 5 is constructed on a seabed ground 3, Caisson 1 after leveling the upper surface
Breakwaters and other marine structures are constructed by placing such structures. Further, the scouring prevention mat member 4 extends over the surface of the foundation mound 5 and the seabed ground 3.
It is also practiced to provide a means for protecting the foundation mound and the seabed from being scoured by ocean currents and waves. The upper surface of the foundation mound 5 and a structure 1 such as a caisson
A mat 6 for increasing friction is arranged between the bottom surface 2 and the mat 6. When the caisson is manufactured, the mat 6
In many cases, the caisson is integrally attached to the lower surface of the bottom plate 2.

As a mat to be attached to the lower surface of the caisson, an asphalt mat is often used. As shown in FIG. 7, an asphalt mat having a thickness of about 8 to 10 cm is set. Generally used as a standard product. When manufacturing the asphalt mat, an internal reinforcing member 7 is disposed between the upper and lower layers 6a and 6b, and the internal reinforcing member 7 is a sheet-like member made of a wire mesh or a glass cloth, or another net. It is configured by arbitrarily combining fibrous materials, wires, reinforcing bars and the like. And the asphalt mat 6
Is installed between the bottom plate of the caisson 1 on the foundation mound 5 and large and small projections 8 such as large stones 8 and small stones 9 on the surface of the foundation mound 5 bite into the lower layer 6b of the asphalt mat. Becomes Therefore, by forming the unevenness on the lower surface of the asphalt mat, the contact area with the surface of the base mound is increased, and the support performance of the caisson or the like can be exhibited well.

[0005]

A structure such as the above-mentioned caisson is often used as a structure which is not permanently moved once installed, and is often moved to another place after several years of use. . However, as shown in FIG. 7, after using the asphalt mat by laying it on the lower surface of the caisson and then trying to reuse only the asphalt mat, the asphalt mat becomes as shown in FIG. On the lower surface of the lower layer 6b, there is a problem that, besides deformation such as unevenness due to the contact of the large protrusion of the stone, a small stone 9 or the like remains as a single piece. Deformation due to the large protrusion of the stone is not a serious problem since it is deformed following the unevenness of the surface of a new foundation mound when the stone is next installed on another foundation mound. On the other hand, when the small stone 9 that has cut into the lower surface of the lower layer of the asphalt mat remains integrally with the asphalt mat, the small stone 9 comes into contact with the large protrusion of the stone of the new foundation mound, and becomes larger upward. It is in a state of being pressed. When a small stone biting into the asphalt mat is greatly pressed, there is a concern that the small stone penetrates the internal reinforcing member of the asphalt mat and projects to the bottom surface of the structure.

In general, when a friction-increasing mat such as an asphalt mat is used, a fixed value of the residual thickness (generally, 3 cm) is eventually obtained even if the mat is pressed by a large projection or the like. Designed and constructed according to remaining standards. However, when using the asphalt mat used once in another place, it is necessary to perform processing work such as removing small stones etc. in order to reuse those that bite small stones etc. Required, and in practice the reuse of asphalt mats remains a major challenge. The fact that small stones and the like bite into and remain attached to the asphalt mat as described above is due to the property that the asphalt easily adheres to the stones and the like, but the characteristics of the asphalt are very low as a mat for increasing friction. At present, there is a demand for the development of a mat that can be reused while maintaining the properties of asphalt mats.

[0007] In addition to the problems at the time of construction as described above, after asphalt mats are manufactured, the asphalt mats are sometimes stored in a stock yard before being transported to a construction site. There are many stones and other irregularities on the ground of the stockyard, and if left as it is for a relatively long time, the mat lower surface may be deformed by the unevenness of the ground or pebbles may enter. Then, when the pebble or the like that has digged into the lower surface of the mat is placed on the foundation mound, the pebble may cause inconvenience such as breaking through the mat by the large projection of the foundation mound as shown in FIG. Is concerned.

The present invention solves the above-mentioned drawbacks of the conventional asphalt mat. The lower surface and side surfaces of the asphalt mat are treated so as not to adhere to stones and the like, and the asphalt mat can be reused. It is intended to provide a mat.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an asphalt mat located at the bottom of a structure and used to increase frictional forces on a foundation mound. The invention of claim 1 of the present invention is characterized in that a surface of the asphalt mat which is in contact with a surface of a foundation mound is subjected to a treatment for preventing the stone from being adhered to the mound. The invention of claim 2 is characterized in that a sheet-like member having high elasticity and elongation is arranged on the surface and the side surface of the asphalt mat in contact with the base mound, and the asphalt and the sheet-like member are bonded. The invention according to claim 3 is characterized in that a granular material of a material having high elasticity is arranged at a constant thickness on a surface in contact with a base mound of the asphalt mat, and a sheet-like material having high elasticity and elongation is provided on a side surface of the asphalt mat. Is provided by bonding.

With the above-described structure, when a sheet-like member having a large elasticity and an elongation rate is arranged on the surface of the asphalt mat of the present invention, the sheet-like member may have a large protrusion such as a stone. Follows the deformation of the mat in contact with the surface, but prevents adhesion between asphalt and stone,
Small stones and the like can be prevented from remaining on the lower surface of the asphalt mat. Further, even when a granular material having high elasticity is used as a member for covering the lower surface of the asphalt mat, the same operation as that of the sheet-like member can be performed. When the asphalt mat is pulled up from the foundation, it can be easily dropped. Therefore, even if large irregularities are formed on the lower surface of the mat after once using the asphalt mat, it can be used for the next structure as it is, and can be effectively used without impairing the characteristics of the asphalt mat. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mat for increasing friction of a structure according to the present invention will be described with reference to the illustrated example. In the example shown in FIG. 1, when manufacturing the asphalt mat 10, the form member 14 is arranged on the production ground, and the sheet-like member 12 is arranged on the ground and on the side surface of the form member.
The asphalt mastic of the lower layer 10b is constructed. After the lower asphalt mastic is applied to a predetermined thickness, the upper surface thereof is leveled, the internal reinforcing member 11 is arranged, and the upper layer 10a having a predetermined thickness is placed on the internal reinforcing member.
The asphalt mat 10 having a constant thickness is formed by constructing the asphalt mastic.

In the asphalt mat 10 constructed as described above, the asphalt mastic is manufactured according to the mixing ratio of the asphalt generally used conventionally, and the internal reinforcing member 11 is made of a wire mesh or glass cloth. Sheet-like members, other net-like fiber materials, wires, reinforcing bars, and the like. Further, in addition to the internal reinforcing member, a wire or the like for cargo handling can be arranged.
In the asphalt mat 10, as the sheet-like members 12, 12a arranged on the lower surface and side surfaces of the mat,
A rubber sheet or the like having an arbitrary thickness can be used. Alternatively, a sheet-like material having high elasticity and high elongation similar to the rubber sheet can be used. When the sheet member 12 is used, the surface of the sheet member 12 that is in contact with the asphalt mastic is coated with an adhesive having an adhesive property to asphalt, and the sheet member 12 is integrated with the mat body. It is good to try.

In the example shown in FIG. 2, an asphalt mat 10 is manufactured by arranging a layer of a highly elastic rubber chip or the like on the lower surface of the asphalt mat, arranging a sheet member 12a on the side surface, and casting asphalt mastic. Is shown. In the asphalt mat of this example, the chip-shaped member 1 is placed on the asphalt mat production ground.
3, the sheet member 12a is arranged so as to cover the inner surface and a part of the bottom surface of the form member 14, the asphalt mastic of the lower layer 10b is constructed, and then the internal reinforcing member 11 is arranged. Then, an asphalt mastic of the upper layer 10a is formed thereon to have a predetermined thickness and integrated therewith. As the chip-shaped member 13, a rubber chip formed by pulverizing an old tire or the like, or any other material can be used, but from the viewpoint of easy availability,
It is good to use a material such as rubber chips made by grinding old tires.

The tip-like member 13 is formed, for example, as a lump having a maximum diameter of about 5 to 10 mm, is laid on the ground with a thickness of 1 to 2 cm, and asphalt mastic is cast thereon. Part of the melted asphalt enters between the chip-shaped members to form a layer integral with the lower layer 10b. When the chip-shaped member is integrated with asphalt as an adhesive, it has the same properties as general rubber asphalt, and therefore, when used as a mat, there is no change in its characteristics. In addition, even if the tip-shaped member is partially peeled off during the loading of the asphalt mat or during the first construction, it will dig in with the small stones attached as long as the asphalt is not exposed. Can be prevented from remaining.

When the asphalt mat constructed as described above is arranged on the foundation mound and the caisson 1 is supported on the foundation mound, as shown in FIG. The large projection 16 and the small stone 17 of the stones in contact with the lower surface of the asphalt mat 10 are pressed. Since the lower surface of the lower layer 10b of the asphalt mat 10 is greatly deformed following the irregularities of the surface of the foundation mound, the coefficient of friction between the surface of the foundation mound and the lower surface of the asphalt mat is increased. It is set so as to exhibit a good property of holding the structure against the force of waves. Further, even when the lower surface of the asphalt mat is deformed due to the unevenness of the surface of the base mound, the layer of the chip-shaped member is always in contact with the surface of the large protrusion of the stone, so that the stone directly contacts the asphalt. It is not adhered and held.

FIG. 4 shows another example of the construction of the asphalt mat according to the present invention. In the example shown in FIG. 4, a large stone projection is formed at the boundary between two asphalt mats arranged on the lower surface of a caisson or the like. 16 is assumed to protrude greatly. As in the example of FIG. 4 described above, even when the large protrusion 16 of the stone bites into the boundary between the two asphalt mats, the sheet member 12 is disposed at the bite portion of the large protrusion of the stone. Therefore, it is possible to prevent the surface of the large protrusion of the stone from directly contacting the asphalt and prevent the stone from being attached to the asphalt.
That is, in the asphalt mat of the present invention, the lower surface and the side surface of the asphalt mat are treated so that the asphalt is not exposed, so that the asphalt mat is placed on the foundation mound or directly on the ground. Even in the case where a small stone or the like is left under the mat, the small stone or the like can be prevented from remaining.

When the asphalt mat 10 having the structure shown in FIGS. 1 and 2 is used once and removed from the construction site, it is deformed according to the surface of the foundation mound as shown in FIG. Then, the lower surface of the asphalt mat remains formed with the unevenness 18 of the lower surface according to the unevenness of the surface of the foundation mound previously applied, but the unevenness of the lower surface is deformed again by the unevenness of the basic mound to be applied next. Therefore, even if new lower surface irregularities are formed, the performance as a mat can be maintained. In other words, in the asphalt mat of the present invention, small stones or the like are not adhered and held on the unevenness on the lower surface, so a small stone as shown in the conventional example is pressed by the next large projection, and the mat is removed. There is no breakthrough problem. In the asphalt mat, the case where the internal reinforcing member is deformed by one use is also assumed, but even if the deformation of the internal reinforcing member remains, the characteristics of the asphalt mat do not have a significant effect, The performance as a mat for increasing friction of a structure can be sufficiently exhibited.

[0018]

Since the asphalt mat of the present invention has the above-described structure, when a sheet-like member having high elasticity and elongation is arranged on the surface of the asphalt mat, the sheet-like member is not provided with the sheet-like member. The member follows the deformation of the mat by contacting the surface of the large protrusion of the stone, etc., but prevents the asphalt and the stone from bonding, preventing small stones from remaining on the lower surface of the asphalt mat. it can. Further, even when a granular material having high elasticity is used as a member for covering the lower surface of the asphalt mat, the same operation as that of the sheet-like member can be performed. When the asphalt mat is pulled up from the foundation, it can be easily dropped. Therefore, even if large irregularities are formed on the lower surface of the mat after once using the asphalt mat, it can be used for the next structure as it is, and can be effectively used without impairing the characteristics of the asphalt mat. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an asphalt mat of the present invention.

FIG. 2 is an explanatory view showing another configuration of the asphalt mat of the present invention.

FIG. 3 is an explanatory view of a construction state of an asphalt mat of the present invention.

FIG. 4 is an explanatory view of a construction state of an asphalt mat different from FIG.

FIG. 5 is an explanatory view of a deformed state of the asphalt mat of the present invention.

FIG. 6 is an explanatory diagram of a construction state of a general offshore structure.

FIG. 7 is an explanatory view of a construction state of a conventional asphalt mat.

8 is an explanatory diagram of a deformed state of the asphalt mat of FIG.

[Explanation of Signs] 1 caisson, 2 bottom plate, 3 submarine ground, 4
Anti-scour mat, 5 Basic mound, 6
Asphalt mat, 7 internal reinforcing member, 8 large protrusion of stone, 9 small stone, 10 asphalt mat, 11 internal reinforcing member, 12 sheet member, 13 chip member, 14 form member,
15 Foundation mound, 16 Large protrusion of stone, 1
7 Small stone, 18 Unevenness on the bottom.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuki Waki 1-2-29-4 Tsurugamine, Asahi-ku, Yokohama-shi, Kanagawa Prefecture Inside World Engineering Co., Ltd. (72) Inventor Mitsuru Nonotada 2--11 Tamagawa, Ota-ku, Tokyo No. 20 Japan Road Co., Ltd. (72) Inventor Takahiko Ito 3-13-1 Kyobashi, Chuo-ku, Tokyo Taisei Rotec Co., Ltd. (72) Inventor Katsuo Matsuzaki 2-10-9 Akasaka, Minato-ku, Tokyo Japan Marine Construction Co., Ltd. (72) Inventor Yuzo Kogami 2-10-9, Akasaka, Minato-ku, Tokyo Nihon Marine Construction Co., Ltd. (72) Inventor Hiroshi Nakano 2- 10-9 Akasaka, Minato-ku, Tokyo Nihonkai Construction Inside the corporation

Claims (3)

[Claims] 1. An asphalt mat disposed at the bottom of a structure and used to increase frictional force on a foundation mound, wherein the surface of the asphalt mat in contact with the surface of the foundation mound has the stone of the mound attached thereto. A mat for increasing friction of a structure, which has been subjected to a treatment for preventing adhesion. 2. The asphalt mat according to claim 1, wherein a sheet-like member having high elasticity and elongation is disposed on a surface and a side surface of the asphalt mat which are in contact with a base mound, and the asphalt and the sheet-like member are bonded. A mat for increasing friction of the structure as described. 3. A sheet-like member having high elasticity and elongation is provided on a surface of the asphalt mat in which a granular material of high elasticity is disposed at a constant thickness on a surface in contact with a base mound of the asphalt mat. The mat for increasing friction of a structure according to claim 1, wherein the mat is provided by bonding.