JP4519611B2 - How to repair blisters on elastic pavement surfaces - Google Patents
How to repair blisters on elastic pavement surfaces Download PDFInfo
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本発明は、弾性舗装の表層に生じた膨れを修復する方法に関する。より詳細には、弾性舗装において、該舗装の表層に生じる膨れをその内部の気体又は気体及び液体を真空ポンプで吸引除去して平坦な表面に戻し、膨れのない弾性舗装表面へ修復する方法に関する。 The present invention relates to a method for repairing a swelling generated on a surface layer of an elastic pavement. More particularly, the present invention relates to a method for restoring a pavement generated on the surface layer of the pavement to a flat surface by sucking and removing the gas or gas and liquid inside the pavement with a vacuum pump and returning to a flat surface in the elastic pavement. .
弾性舗装の表層に生じる膨れは、舗装表面の外観を損なうだけではなく、その膨れに基因して表層が大きく剥離、破壊され、重大な事故を引き起こしたり、弾性舗装を使用不可能にしたり、さらには、大々的な改修舗装工事を余儀なくされることになり、大きな問題とされている。
この膨れの現象は、特に弾性舗装において、アスファルトコンクリート層と弾性舗装層を含んで構成される弾性舗装において見られる現象である。このような構成からなる弾性舗装では、特に、ポリウレタン等の弾性舗装層では、表面層は殆ど通気性がなく、一方、弾性舗装層は太陽の輻射熱等により温度上昇し、該層とアスファルトコンクリート層との間に、層内水分や下地水分が蒸発して膨張し、これらが弾性舗装表層を押し上げて膨れを生じるとされている。
このような現象を根本的に防止するため、アスファルトコンクリート層と弾性舗装層との間に下地水分が浸入したり、溜まらないようにしたり、排水やエアー抜き等の工夫や、アスファルトコンクリート層と弾性舗装層の接着力を強化した開粒度アスファルトコンクリート層により層内を通気し易いようにする等の工夫がなされている。
しかしながら、このような方法を採用しても、膨れ現象を根本的に解消することは困難であり、実際施工された弾性舗装には、舗装表層の大きな剥離に繋がりかねない部分的膨れが生じることを避けることができない。
The swelling that occurs on the surface of the elastic pavement not only impairs the appearance of the pavement surface, but the surface layer is largely peeled and destroyed due to the swelling, causing a serious accident, and making the elastic pavement unusable. This is a big problem because it will require extensive renovation work.
This swelling phenomenon is a phenomenon observed in an elastic pavement including an asphalt concrete layer and an elastic pavement layer, particularly in an elastic pavement. In an elastic pavement having such a structure, particularly in an elastic pavement layer such as polyurethane, the surface layer has almost no air permeability, while the elastic pavement layer rises in temperature due to solar radiant heat or the like, and the layer and the asphalt concrete layer In the meantime, the moisture in the layer and the base moisture evaporate and expand, which pushes up the elastic pavement surface layer and causes swelling.
In order to fundamentally prevent such a phenomenon, the base moisture enters between the asphalt concrete layer and the elastic pavement layer so that it does not collect or collect, and measures such as drainage and air venting, asphalt concrete layer and elastic The open-graded asphalt concrete layer which strengthened the adhesive strength of the pavement layer has been devised to make it easy to ventilate the inside of the layer.
However, even if such a method is adopted, it is difficult to fundamentally eliminate the swelling phenomenon, and the actually constructed elastic pavement has a partial swelling that can lead to large peeling of the pavement surface layer. Cannot be avoided.
このような膨れが見出されたとき、膨れを対症療法的に修復する方法が採られている。
従来、膨れを修復するには、膨れ部分のそれぞれに数箇所の小さな孔を開け、膨れ部分の表面を押圧して、これらの孔から膨れ内部の気体又は気体及び液体を押出して除去し、その後、それらの孔から接着剤を注入して膨れ部分の表面を押圧し、内部を接着させる施工方法が採用されていた。
しかしながら、この方法で、注入した接着剤により膨れ内部を十分に接着させるには、膨れ部分の表面を押圧し、さらに膨れ部分の上に重しを載せて接着が完了するのを待たなければならなかった。そのため膨れの数に応じた多数の重しを施工現場に運搬する作業、修復しようとする膨れ部分のそれぞれに重しを載せる作業などの多大の労力、及び接着が完了するまでに相当の時間を必要としていた。また、この方法では膨れ内部に注入された接着剤のために膨れを平坦に修復することが困難であった。
When such a bulge is found, a method of symptomatically repairing the bulge has been adopted.
Conventionally, in order to repair the bulge, several small holes are made in each of the bulge portions, the surface of the bulge portion is pressed, and the gas or gas and liquid inside the bulge is pushed out from these holes and then removed. A construction method has been adopted in which an adhesive is injected from these holes to press the surface of the swollen portion to bond the inside.
However, in this method, in order to sufficiently bond the inside of the bulge with the injected adhesive, it is necessary to press the surface of the bulge portion and further put a weight on the bulge portion and wait for the bonding to be completed. There wasn't. Therefore, a great deal of labor, such as the work of transporting a large number of weights according to the number of blisters to the construction site, the work of placing a weight on each of the swollen parts to be repaired, and a considerable amount of time to complete the bonding I needed it. Further, it has been difficult for this method to flatten the blister due to the adhesive injected into the blister.
本発明の課題は、弾性舗装の表層、特にポリウレタン弾性舗装やゴム系シート弾性舗装等の表層に生じた膨れを簡単な方法で修復し、平坦な表面に戻す方法を提供することである。 An object of the present invention is to provide a method for repairing a swelling generated on a surface layer of an elastic pavement, particularly a surface layer of a polyurethane elastic pavement or a rubber sheet elastic pavement, by a simple method and returning the surface to a flat surface.
本発明者等は、この課題に関し鋭意検討し、特殊な装置や薬剤を使用せず簡単な方法及び操作により弾性舗装の膨れを修復する方法を見出した。
すなわち、本発明は、弾性舗装の表層に生じた膨れを、該膨れ部分内部の気体又は気体及び液体を吸引除去して平坦な表面に戻すことを特徴とする弾性舗装表面の膨れ修復方法である。
膨れの内部に生じた気体又は気体及び液体を吸引除去するには、弾性舗装の膨れ部分の表面層に小径の挿入管を挿し込み、この管を通して真空ポンプを用いて行う。
The present inventors diligently studied on this problem, and found a method for repairing the swelling of the elastic pavement by a simple method and operation without using a special device or medicine.
That is, the present invention is a method for repairing a blister on the surface of an elastic pavement, wherein the blister generated on the surface layer of the elastic pavement is returned to a flat surface by removing the gas or gas and liquid inside the swollen portion by suction. .
In order to suck and remove the gas or gas and liquid generated inside the bulge, a small diameter insertion tube is inserted into the surface layer of the bulge portion of the elastic pavement, and a vacuum pump is used through the tube.
本発明の方法によれば、弾性舗装表層の膨れ部分に殆ど損傷を与えず、平坦な表面に修復することが可能であり、膨れが生じていた弾性舗装表層の状態を殆ど原状に修復することができる。
使用する装置又は器具として、通常の各種施工に使用される小〜大型、特に小型の真空ポンプ等を用い、及び弾性舗装表層の膜を通すことができる挿入管を用いれば、特に、接着剤を膨れ内部に注入することなく、膨れ内部の気体又は気体及び液体を吸引除去するだけで、また膨れ部分の表面を押圧することなく、膨れ内部の弾性舗装層とアスファルトコンクリート層を密着させ、膨れを修復することができる。
According to the method of the present invention, it is possible to restore the flat surface without causing any damage to the swollen portion of the elastic pavement surface layer, and to restore the state of the elastic pavement surface layer in which the swollenness is almost restored to the original state. Can do.
As an apparatus or instrument to be used, if using a small to large, especially small vacuum pump, etc., used for various ordinary constructions, and using an insertion tube that can pass the membrane of the elastic pavement surface layer, in particular, an adhesive is used. Without injecting into the inside of the bulge, only the gas or gas and liquid inside the bulge is sucked and removed, and without pressing the surface of the bulged part, the elastic pavement layer and the asphalt concrete layer inside the bulge are brought into close contact with each other, and Can be repaired.
本発明の方法は、アスファルトコンクリート層（以下、単にアスコン層と言う）上に弾性舗装層を打設した弾性舗装の表層に生じる膨れを、該膨れ部分の内部に存在する気体又は気体及び液体を吸引除去することを特徴とする弾性舗装表面の膨れを修復する方法である。
本発明における弾性舗装とは、特にポリウレタン弾性舗装層やクロロプレン等のゴム系シート弾性舗装層を用いる弾性舗装であって、基盤上にアスコン層を積層しその上に、ポリウレタン弾性層、更にエンボス層及びトップコート層等、又はゴム系シートを積層して得られる弾性舗装である。
また、弾性舗装に生じる膨れとは、弾性舗装表面が部分的に膨れ上がる現象を言う。本発明に於いて、弾性舗装表層の膨れは大きさや数等が特定されるものではない。
この膨れは、ブリスタリング現象と称され、弾性舗装であるポリウレタン弾性舗装やゴム系シート弾性舗装層では、舗装の運営・維持管理上、極めて大きな問題であり、この現象の発生の確認と速やかな修復は弾性舗装表面の安全な維持管理には必要不可欠である。
ブリスタリング現象は、太陽光の副射熱により温度上昇し、弾性舗装層表面が膨張したり、及び内部のアスコン層も軟化したり、同時にアスコン層と弾性舗装層間内部に残存していた水分や下地を通して齎される地下水分が、蒸発、気化して膨張し、軟化した弾性舗装層表面に膨れとして現れる現象である。
すなわち、本発明で言う膨れとは、弾性舗装内部のアスコン層と弾性舗装層内に生じた気体、又は気体及び液体が、舗装層内で膨張して弾性を有する弾性舗装の表面が部分的に膨れ上がる現象である。
According to the method of the present invention, a bulge generated in a surface layer of an elastic pavement in which an elastic pavement layer is placed on an asphalt concrete layer (hereinafter simply referred to as an ascon layer) is removed from a gas or a gas and a liquid existing inside the bulge portion. It is a method for repairing the swelling of the elastic pavement surface characterized by suction removal.
The elastic pavement in the present invention is an elastic pavement using a rubber-based sheet elastic pavement layer such as a polyurethane elastic pavement layer or chloroprene in particular, and an ascon layer is laminated on a base, and a polyurethane elastic layer and further an emboss layer And an elastic pavement obtained by laminating a top coat layer or the like or a rubber-based sheet.
Further, the swelling generated in the elastic pavement refers to a phenomenon in which the elastic pavement surface partially swells. In the present invention, the size and number of the swelling of the elastic pavement surface layer are not specified.
This swelling is called a blistering phenomenon, and is an extremely large problem in the operation and maintenance of pavement in polyurethane elastic pavement and rubber sheet elastic pavement, which are elastic pavements. Restoration is essential for safe maintenance of elastic pavement surfaces.
The blistering phenomenon is caused by the temperature rising due to the side heat of sunlight, the surface of the elastic pavement layer expands, and the internal ascon layer softens. This is a phenomenon in which underground moisture drowned through the foundation expands by evaporation, vaporization, and appears as swelling on the softened elastic pavement surface.
That is, the swelling referred to in the present invention means that the gas generated in the ascon layer and the elastic pavement layer inside the elastic pavement, or the gas and liquid expands in the pavement layer, and the surface of the elastic pavement having elasticity is partially It is a phenomenon that swells up.
本発明に於いては、膨れの原因であるアスコン層と弾性舗装層間に生成して存在する気体又は気体及び液体を吸引除去するために真空ポンプを用いる。
真空ポンプは、特に限定されるものではない。弾性舗装層の膨れ部分の内部から気体又は気体及び液体を排出除去できるものであれば、舗装表面に膨れの大きさに応じて適切な種類と規模の真空ポンプを選択して使用できる。
膨れは、発生原因、発生から発見までの時間の経過等により形、大きさは種々様様である。したがって、修復に用いる真空ポンプは、膨れの規模や状態に応じて、簡易に使用できる手動式吸引ポンプ、小型から大型の揺動ピストン型真空ポンプ、ダイアフラム真空ポンプ等の往復動式ポンプ、油回転真空ポンプ、ドライポンプ等の回転式ポンプ等から選択することができる。また、膨れ部分の大きさによっては、通常、自転車タイヤ、球技用ボール等の空気入れとして使用されるポンプを真空ポンプ用として改造して吸引のために使用することもできる。
In the present invention, a vacuum pump is used to suck and remove the gas or gas and liquid that are generated between the ascon layer and the elastic pavement layer, which are the cause of swelling.
The vacuum pump is not particularly limited. As long as gas or gas and liquid can be discharged and removed from the inside of the swelling portion of the elastic pavement layer, a vacuum pump of an appropriate type and scale can be selected and used on the pavement surface according to the size of the swelling.
Swelling varies in shape and size depending on the cause of the occurrence and the passage of time from occurrence to discovery. Therefore, the vacuum pumps used for restoration are hand-operated suction pumps that can be used easily according to the scale and condition of the swelling, small to large oscillating piston vacuum pumps, reciprocating pumps such as diaphragm vacuum pumps, oil rotation It can be selected from rotary pumps such as vacuum pumps and dry pumps. Also, depending on the size of the swollen part, a pump that is usually used as a pneumatic pump for bicycle tires, ball balls, etc. can be modified for a vacuum pump and used for suction.
真空ポンプの吸気口側に繋いだ耐圧ゴム管の先端に、膨れ内部の気体又は気体及び液体を吸入除去するため耐圧性の小径の挿入管、例えば、注射針や注入針のような小径の管を取り付ける。
この挿入管を弾性舗装表層の膨れ部分の任意の個所に挿入する。膨れ部分の空間まで十分に挿入した後、真空ポンプを稼動させて膨れ部分内部の気体又は気体及び液体を吸引除去して真空状態とする。また、膨れ部分内部の気体が液体を含む場合は、真空ポンプと挿入管を繋ぐ耐圧管の途中に液体を除去するためのトラップを設置する。
真空ポンプで膨れ部分内部の気体又は気体及び液体を吸引した後、挿入管を抜いた孔は自然に塞がれるか、または必要により接着剤で塞ぐことにより弾性舗装層とアスコン層との空間は真空状態となる。
真空状態となることにより、弾性舗装層とアスコン層は膨れを生じていた状態から、弾性舗装竣工時のほぼ原状に戻り、内部はアスファルト固有の接着性により強固に接着し、膨れ部分の表面を平坦な表面に修復させる。この際、膨れ部分の表面からの押圧や、通常使用される装置を用いて転圧する必要はない。
吸引終了後、更に押圧又は転圧によって内部のアスコン層を接着させる必要はないが、膨れを内部の気体又は気体及び液体を吸引除去して、平坦な表面に戻した後、接着剤を注入して、表面を押圧する方法を併用してもよい。
この際使用する接着剤は特に限定されず、ポリウレタン弾性層の施工に適切な接着剤を適宜選択して使用できる。
At the tip of a pressure-resistant rubber tube connected to the suction port side of the vacuum pump, a pressure-resistant small-diameter insertion tube, for example, a small-diameter tube such as an injection needle or an injection needle, for sucking and removing the gas or gas and liquid inside the blister Install.
This insertion tube is inserted into an arbitrary portion of the swollen portion of the elastic pavement surface layer. After fully inserting into the space of the bulging portion, the vacuum pump is operated to suck and remove the gas or gas and liquid inside the bulging portion to obtain a vacuum state. In addition, when the gas inside the swollen portion contains liquid, a trap for removing the liquid is installed in the middle of the pressure tube connecting the vacuum pump and the insertion tube.
After sucking the gas or gas and liquid inside the swollen part with a vacuum pump, the hole extracted from the insertion tube is naturally closed, or if necessary, the space between the elastic pavement layer and the ascon layer is closed with an adhesive. It becomes a vacuum state.
By entering the vacuum state, the elastic pavement layer and the ascon layer were swollen, returning to almost the original shape when the elastic pavement was completed, and the inside was firmly bonded by the asphalt-specific adhesiveness, and the surface of the swollen part was Repair to a flat surface. At this time, there is no need to press from the surface of the swollen portion or to use a normally used device for rolling.
After completion of the suction, there is no need to further bond the inner ascon layer by pressing or rolling, but the blister is removed by suctioning the internal gas or gas and liquid back to a flat surface, and then the adhesive is injected. A method of pressing the surface may be used in combination.
The adhesive used in this case is not particularly limited, and an adhesive suitable for the construction of the polyurethane elastic layer can be appropriately selected and used.
本発明の方法で、弾性舗装表面の膨れを修復した例を以下説明する。
長さ３００ｍｍ×幅３００ｍｍ×高さ５０ｍｍの金枠を用いて密粒度アスコンを作製した。これに水分を含ませ、上部表面の除く５面に２液型エポキシを塗布硬化させ、塗膜面とした。ついで下地処理剤、２液型ウレタンを５ｍｍの厚さに塗布した試料を調製した。これらの試料を、室温４０℃にし、次いで試料上部に設置した赤外線ランプで照射し、試料の温度を５０〜７０℃まで上げて弾性層表面に強制的に膨れを生じさせた。
手動式真空ポンプ（アルベック社製真空ポンプＧ−５）の吸気口側に耐圧管を取り付け、その先端に内径約１ｍｍの注入針を取り付けた。また、耐圧管の途中にトラップを取り付け、膨れ内部に気体とともに含まれる液体を捕集できるようにした。
挿入管を膨れの任意の個所に挿し込み、真空ポンプを作動させた。膨れ部分内の気体及び液体は吸引除去され、膨れ部分は平坦となった。真空ポンプを止めて挿入管を抜き取った。挿入管を挿入した孔は瞬間接着剤で塞いだ。
このよう方法による膨れ部分内の気体及び液体の吸引除去は瞬時に完結し、膨れ部分は、平坦となりその表面を小太鼓のバチで叩いても内部に空間があるような音は認められず、修復後の膨れ内部に空隙がないことを示した。修復前では膨れ部分を叩くとあたかも太鼓を叩いているような音を発する。
An example in which the swelling of the elastic pavement surface is repaired by the method of the present invention will be described below.
Dense particle size ascon was produced using a metal frame of length 300 mm × width 300 mm × height 50 mm. Moisture was added to this, and two-component epoxy was applied and cured on the five surfaces excluding the upper surface to form a coating film surface. Subsequently, the sample which apply | coated the surface treating agent and 2 liquid type urethane to the thickness of 5 mm was prepared. These samples were brought to a room temperature of 40 ° C., and then irradiated with an infrared lamp installed on the top of the sample, and the temperature of the samples was raised to 50 to 70 ° C. to forcibly cause swelling on the elastic layer surface.
A pressure-resistant tube was attached to the inlet side of a manual vacuum pump (Albec vacuum pump G-5), and an injection needle having an inner diameter of about 1 mm was attached to the tip. In addition, a trap was attached in the middle of the pressure tube so that the liquid contained with the gas inside the bulge could be collected.
The insertion tube was inserted into any part of the bulge and the vacuum pump was activated. The gas and liquid in the swollen portion were removed by suction, and the swollen portion became flat. The vacuum pump was stopped and the insertion tube was removed. The hole into which the insertion tube was inserted was closed with an instantaneous adhesive.
The suction and removal of the gas and liquid in the swollen portion by this method is completed instantly, and the swollen portion is flat, and even if the surface is struck with a small drumstick, there is no sound that has a space inside, It was shown that there was no void inside the bulge after repair. Before repairing, hitting the swollen part sounds like a drum hit.
比較のため、試料の表面の膨れ部分の任意位置に数箇所の孔をあけ、膨れ部分の表面を押して膨れ内部の気体と液体を押出した。膨れを平坦な表面にするには、かなりの圧力で押さえつける必要があった。押えて平坦にした後、注入針を用いて液状の接着剤を注入し、その後、この膨れ部分上面を押圧又は転圧して平坦にした。
さらにその後、その部分に板を置き、さらにその上に重しを載せて数時間放置し、膨れ内部が完全に接着するのを待った。
この方法では、注入した接着剤により膨れ部分を完全に平坦にするのが困難である。また、この方法では、膨れの数に応じた重しを予め準備しておくことや接着剤の硬化まで放置しておく時間が必要であるなどの問題がある。
又、修復の度合いを確かめる定性的な方法として上記のような小太鼓のバチで修復後の膨れ部分の表面を叩くと、修復後の膨れ部分の中には内部に空隙が残っているような音を発するものが残り、これらは再度修復作業を行い、膨れ部分内部を十分に接着させねばならなかった。
For comparison, several holes were made at arbitrary positions on the swollen portion of the surface of the sample, and the surface of the swollen portion was pushed to extrude the gas and liquid inside the swollen portion. In order to make the blister flat, it was necessary to press it down with considerable pressure. After pressing and flattening, a liquid adhesive was injected using an injection needle, and then the upper surface of the swollen portion was pressed or rolled to flatten it.
After that, a plate was placed on the portion, a weight was placed on the plate, and the plate was allowed to stand for several hours.
In this method, it is difficult to completely flatten the swollen portion with the injected adhesive. In addition, this method has a problem that a weight corresponding to the number of blisters is prepared in advance, and it is necessary to leave the adhesive until it is cured.
In addition, as a qualitative method for confirming the degree of repair, when the surface of the swollen portion after repair is hit with a small drumstick as described above, voids remain in the swollen portion after repair. Some of the sound remained, and these had to be repaired again and the inside of the bulges had to be well bonded.
上記の本発明の修復方法は、従来実施していた修復方法に比べ、著しく優れた特徴を有する。この方法で、予想外であった効果は、吸引で膨れ内部空間を真空状態とすると、アスコン層と弾性舗装層が密着して、アスファルト固有の接着性により強固に接着するためか、弾性舗装表面の膨れが、平坦で且つ安定な表面に修復されることである。また、作業は簡潔であり、従来実施していた方法に比べ、時間と手間を省くことができる。 The above-described repair method of the present invention has remarkably superior characteristics as compared with a repair method that has been conventionally performed. The unexpected effect of this method is that if the internal space is swollen by suction and the internal space is evacuated, the ascon layer and the elastic pavement layer come into close contact with each other and adhere firmly to the asphalt-specific adhesiveness. The blisters are repaired to a flat and stable surface. Moreover, the work is simple and time and labor can be saved compared with the method conventionally implemented.
弾性舗装のアスコン層と弾性舗装層との間で、この層間に浸透してくる地下水分が弾性舗装表面からの太陽輻射熱により気化して生じる弾性舗装の表面に膨れを、簡単な方法で確実に、且つ平坦な表面に修復できる本発明の方法は、弾性舗装の維持管理上、大きな問題である弾性舗装表面の膨れを修復する方法として極めて有用である。 Between the Ascon layer and the elastic pavement layer of the elastic pavement, it is ensured by a simple method that the underground moisture that permeates between the layers is vaporized by the solar radiant heat from the surface of the elastic pavement and swells on the surface of the elastic pavement. The method of the present invention that can restore a flat surface is extremely useful as a method for repairing the swelling of the elastic pavement surface, which is a major problem in maintaining and managing the elastic pavement.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0516809U (en) * | 1991-08-09 | 1993-03-02 | 日勝スポーツ工業株式会社 | Structure of tracks and courts such as athletic fields |
| JPH06101211A (en) * | 1992-08-07 | 1994-04-12 | Yuki Jidosha Kojo:Kk | Cooling method for asphalt pavement and asphalt pavement cooling sheet |
| JPH06240617A (en) * | 1993-02-22 | 1994-08-30 | Hitachi Chem Co Ltd | Repair of structure |
| JPH0853940A (en) * | 1994-08-10 | 1996-02-27 | Kiyuuken Sangyo Kk | Concrete surface finishing method |
| JPH1037116A (en) * | 1996-07-25 | 1998-02-10 | Chikada Kogyosho:Goushi | Slip preventing groove forming tool and using method thereof |
| JP2004137682A (en) * | 2002-10-15 | 2004-05-13 | Nippo Corporation:Kk | Core sampling method of asphalt pavement body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0516809U (en) * | 1991-08-09 | 1993-03-02 | 日勝スポーツ工業株式会社 | Structure of tracks and courts such as athletic fields |
| JPH06101211A (en) * | 1992-08-07 | 1994-04-12 | Yuki Jidosha Kojo:Kk | Cooling method for asphalt pavement and asphalt pavement cooling sheet |
| JPH06240617A (en) * | 1993-02-22 | 1994-08-30 | Hitachi Chem Co Ltd | Repair of structure |
| JPH0853940A (en) * | 1994-08-10 | 1996-02-27 | Kiyuuken Sangyo Kk | Concrete surface finishing method |
| JPH1037116A (en) * | 1996-07-25 | 1998-02-10 | Chikada Kogyosho:Goushi | Slip preventing groove forming tool and using method thereof |
| JP2004137682A (en) * | 2002-10-15 | 2004-05-13 | Nippo Corporation:Kk | Core sampling method of asphalt pavement body |
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