JP2772991B2 - Civil engineering method using foamable resin - Google Patents
Civil engineering method using foamable resinInfo
- Publication number
- JP2772991B2 JP2772991B2 JP10700390A JP10700390A JP2772991B2 JP 2772991 B2 JP2772991 B2 JP 2772991B2 JP 10700390 A JP10700390 A JP 10700390A JP 10700390 A JP10700390 A JP 10700390A JP 2772991 B2 JP2772991 B2 JP 2772991B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- foaming
- gas injection
- gas
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920005989 resin Polymers 0.000 title claims description 36
- 239000011347 resin Substances 0.000 title claims description 36
- 238000012407 engineering method Methods 0.000 title claims description 4
- 238000005187 foaming Methods 0.000 claims description 34
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 2
- 239000012508 resin bead Substances 0.000 description 22
- 239000006260 foam Substances 0.000 description 19
- 239000002356 single layer Substances 0.000 description 10
- 239000004576 sand Substances 0.000 description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Road Paving Structures (AREA)
Description
本発明は、発泡性樹脂を現場で必要形状に発泡させる
ことによって、盛土，人工地盤の形成，道路の拡幅工事
等を簡便に行う土木工法に関する。The present invention relates to a civil engineering method for easily performing embankment, formation of artificial ground, road widening work, and the like by foaming a foamable resin into a required shape on site.
発泡樹脂の軽量性を活かして、窪地を埋めたり人工地
盤の一部とする試みが従来から行われている。 たとえば、発泡性樹脂を工場で所定形状の発泡体ブロ
ックに成形し、この発泡体ブロックを盛土しようとする
原地盤に積み上げ、表層面にコンクリート床板や壁面保
護材等を張って仕上げている。また、内部に鉄筋等の補
強材を配置して、構造的な強度を向上させることも行わ
れている。 このように発泡体を積み重ねて地盤を形成するとき、
発泡体ブロック相互の間にズレが生じ易い。そこで、実
開昭63−81941号公報，実開昭63−81942号公報等におい
ては、このズレをなくすため、発泡体ブロックの表面に
凹凸を形成し、この凹凸を噛み合わせることが紹介され
ている。 ところが、工場で発泡させた後の発泡体ブロックを現
場まで運搬し、所定の形状に積み上げる方式では、運搬
や取扱いに手数がかかる。たとえば、この種のブロック
として２×１×0.5m程度の大型ブロックを使用している
が、このような大型のものにあっては、軽量であるにも
拘らず、運搬に人出を要する。また、その運搬は、実質
的には空気を運搬しているようなものであり、無駄が多
い。しかも、ブロックが大型になるほど、盛土等の作業
を施そうとする原地盤を平にして敷き詰められたブロッ
クとの間に隙間が形成されないようにすることが必要と
なる。 また、特開昭47−19617号公報では、窪地又は路床上
にウレタン，塩化ビニル，スチレン等の未発泡樹脂を散
布した後、発泡反応を行わせて、窪地等の充填を行うこ
とが開示されている。しかし、当該公報には、樹脂をど
のように発泡させるかに関して具体的に教示するところ
がない。ところで、単に樹脂を発泡させるだけでは、不
均一な発泡等に起因して発泡後の樹脂体表面が必要とす
る輪郭を持たないことが多い。また、自由界面で発泡さ
せると、発泡体の表面強度が充分でなく、踏圧が加わっ
たとき窪み等が生じ易くなる。Attempts have been made in the past to make use of the lightweight properties of the foamed resin to fill in depressions or to make them a part of artificial ground. For example, a foamable resin is molded into a foam block having a predetermined shape at a factory, the foam block is piled up on an original ground to be embanked, and a concrete floor plate, a wall protection material and the like are stretched on the surface layer to finish. Further, a reinforcing material such as a reinforcing bar is arranged inside to improve the structural strength. When stacking foam in this way to form the ground,
A gap easily occurs between the foam blocks. Accordingly, Japanese Utility Model Laid-Open No. 63-81941, Japanese Utility Model Laid-Open No. 63-81942, and the like introduce a method of forming irregularities on the surface of a foam block and engaging the irregularities in order to eliminate the deviation. I have. However, the method of transporting the foamed block after foaming at the factory to the site and stacking the foamed block in a predetermined shape takes time and effort to transport and handle. For example, a large block of about 2 × 1 × 0.5 m is used as this type of block, but such a large block requires a large number of people for transportation, despite its light weight. In addition, the transportation is substantially as if carrying air, and there is much waste. In addition, as the size of the block becomes larger, it is necessary to prevent the formation of a gap between the block and the block that is laid flat by flattening the original ground on which the work such as embankment is to be performed. Further, Japanese Patent Application Laid-Open No. 47-19617 discloses that an unfoamed resin such as urethane, vinyl chloride, styrene or the like is sprayed on a depression or a roadbed, and then a foaming reaction is performed to fill the depression or the like. ing. However, the publication does not specifically teach how to foam the resin. However, simply foaming the resin often does not have the required contour on the resin body surface after foaming due to uneven foaming or the like. In addition, when foaming is performed at the free interface, the surface strength of the foam is not sufficient, and dents and the like easily occur when a tread pressure is applied.
本発明者等は、現場施工の利点を活かしながら、必要
とする強度をもつ人工地盤等を形成する工法として、型
枠で仕切られた原地盤に発泡性樹脂のビーズを散布し、
加熱気体によって樹脂ビーズを発泡させることにより人
工地盤をを構築する方法を開発した。 ところで、樹脂ビーズを発泡させて人工地盤を構築す
るとき、樹脂ビーズを発泡させて人工地盤を構築すると
き、樹脂ビーズの不均一な発泡が起こりがちである。そ
の結果、発泡後の樹脂体表面での凹凸発生や内部の空洞
発生等の欠陥が生じることになる。このような欠陥は、
樹脂ビーズに対する蒸気等の加熱気体の不均一な接触に
起因するものと推察される。 そこで、本発明は、発泡の全工程にわたり樹脂ビーズ
に満遍なく加熱気体を接触させることにより、樹脂ビー
ズを均一に発泡させ、目標とする形状をもった樹脂発泡
体製の人工地盤を構築することを目的とする。The present inventors, while making use of the advantages of on-site construction, as a method of forming an artificial ground having the required strength, as a method of forming foam, spread beads of foamable resin on the original ground partitioned by a formwork,
A method for constructing artificial ground by foaming resin beads with heated gas was developed. By the way, when constructing an artificial ground by foaming resin beads, when constructing artificial ground by foaming resin beads, uneven foaming of resin beads tends to occur. As a result, defects such as generation of irregularities on the surface of the resin body after foaming and generation of internal cavities will occur. Such defects are:
It is presumed to be caused by uneven contact of the heating gas such as steam with the resin beads. Therefore, the present invention provides a method for constructing an artificial ground made of a resin foam having a target shape by uniformly bringing a heated gas into contact with the resin beads throughout the foaming process, thereby uniformly foaming the resin beads. Aim.
本発明の土木工法は、この目的を達成するため、三次
元格子状のガス吹込み管体を原地盤上に配置し、該ガス
吹込み管体の隙間に発泡性樹脂のビーズを充填し、前記
ガス吹込み管体の上側開口部に型枠に穿設した貫通孔に
プラグを挿入し、前記ガス吹込み管体から前記ビーズ中
に加熱気体を吹き込むことによって前記発泡性樹脂を発
泡させ、発泡による樹脂の体積膨張に応じて前記プラグ
を上昇させながら加熱気体の吹込みを継続することを特
徴とする。In order to achieve this object, the civil engineering method of the present invention arranges a three-dimensional lattice-shaped gas injection pipe on the original ground, and fills gaps between the gas injection pipes with beads of foamable resin. A plug is inserted into a through hole formed in the mold at the upper opening of the gas injection pipe, and the foaming resin is foamed by blowing a heated gas into the beads from the gas injection pipe, The blowing of the heating gas is continued while raising the plug according to the volume expansion of the resin due to foaming.
ガス吹込み管体から加熱気体が吹き出される位置は、
発泡の進行に伴って上昇する。したがって、必要とする
箇所に発泡用の加熱気体が供給され、樹脂ビーズの均一
な発泡が行われる。また、発泡終了後は、ガス吹込み管
体は、補強部材として樹脂発泡体内部に残存する。その
ため、樹脂発泡体の構造強度が向上し、型崩れ等の問題
を生じることがない。 本発明で使用される発泡性樹脂としては、スチレン樹
脂，フェノール樹脂，尿素樹脂，ウレタン樹脂等、各種
のものが市販されている。発泡温度は、これら樹脂の種
類によって適宜定められるが、通常70〜200℃程度で充
分な発泡反応を進行させることができる。また、発泡倍
率の程度によって、発泡体の強度を調製することができ
る。The position where the heated gas is blown out from the gas injection pipe is
It rises with the progress of foaming. Therefore, a heating gas for foaming is supplied to a required portion, and uniform foaming of the resin beads is performed. After the foaming is completed, the gas injection tube remains inside the resin foam as a reinforcing member. Therefore, the structural strength of the resin foam is improved, and there is no problem such as shape collapse. As the foamable resin used in the present invention, various resins such as styrene resin, phenol resin, urea resin and urethane resin are commercially available. The foaming temperature is appropriately determined depending on the type of the resin, and usually a foaming reaction can be sufficiently performed at about 70 to 200 ° C. Further, the strength of the foam can be adjusted depending on the degree of the expansion ratio.
以下、図面を参照しながら、窪地の盛土に適用した実
施例により、本発明を具体的に説明する。 本実施例においては、第１図及び第２図に示すように
原地盤１に生じている深さ80cmの窪地２に所定の盛土を
する。このとき、窪地２の内部にガス吹込み管体３を配
設する。また、必要に応じて窪地の底部に砂４を充填
し、ガス吹込み管体３の下部を砂層４に埋設する。砂層
４は、特に発泡の初期に樹脂ビーズ５に水蒸気等の加熱
気体を均一に供給する上で有効である。 ガス吹込み管体３は、第２図に示すように、パイプを
井桁状に組み合わせた単層管体3a,3b,3c・・・を縦管3
x,3y,3z・・・で接続して多段に構成したものである。
そして、これら管体の周面に、内部に連通した複数のガ
ス噴出孔3pが穿設されている。なお、単層管体3a,3b,3c
・・・を積み上げる段数は、盛土を使用とする窪地２の
深さに応じて調製される。そのため、各単層管体3a,3b,
3c・・・ごとに接続或いは分離可能なように、縦管3x,3
y,3zを着脱自在とすることが好ましい。 最上段にある縦管3zは、その上端部が開口している。
そして、この開口端部から、型枠６の貫通孔6aに挿通さ
れたプラグ７が縦管3z,3y,3xに挿通される。プラグ７が
挿入されている箇所にある縦管（第２図では中段の縦管
3y及び最上段の縦管3z）のガス噴出孔3pは閉塞されてお
り、プラグ７の下端より下方に位置す最下段3xのるガス
噴出孔3pが開放されている。 プラグ７は、天板８に一体的に固定されている。天板
８は、昇降シリンダ９によって昇降自在となっている。
昇降シリンダ９の駆動は、使用する樹脂ビーズ５の種類
に応じた発泡反応の進行状態を予め取り込んだプログラ
ムによって駆動される。或いは、窪地２内部の発泡の進
行を検出し、発泡体の高さに応じて昇降シリンダ９を駆
動させ、プラグ７を上昇させても良い。プラグ７の上昇
に伴って、プラグ７でガス噴出孔3pが閉塞されている箇
所が上方に移動する。 最下層の単層管体3aには、給気管10が閉口している。
そして、給気管10は、給気ポンプ11を介してボイラー12
につながっている。これにより、ボイラー12で発生した
水蒸気は、給気ポンプ11によってガス吹込み管体３に送
り込まれた後、砂層４を経由して或いは直接に樹脂ビー
ズ５の層内に吹き込まれる。 水蒸気の温度は、樹脂ビーズ５の種類にもよるが、ス
チレン樹脂の場合には80〜120℃程度の水蒸気が使用さ
れる。 樹脂ビーズとしては、平均粒径0.9mmのスチレン樹脂
を使用した。この樹脂は、第３図に示すように温度及び
時間との関係で発泡反応を開始し、反応終了時に発泡倍
率30〜45倍程度の発泡体に膨張し、発泡後の密度が約0.
015g/cm3となるものであった。この発泡反応に与える温
度及び時間の影響は、樹脂ビーズの種類によって定まっ
ているものである。 窪地２としては、1m×1mの断面積で深さ80cmのものを
試堀した。 内径20mmの鋼管に口径1mmのガス噴出孔3pを１個/cm2
の割合で穿設し、23cm間隔で縦横合計８本を井桁状に組
み合わせたものを単層管体3a,3b,3cとし、これら単層管
体3a、3b,3cを段差30cm間隔で同様な縦管3a,3bで接続し
てガス吹込み管体３とした。また、最上層の単層管体3c
には、長さ25cmの縦管3zを接続した。 また、最上層の縦管3zに対応する位置に、直径20cmで
長さ75cmのプラグ７を植設した型枠６を用意した。プラ
グ７としては、縦管3x,3y,3zの内壁面に対する密着性が
良好で、且つ摩擦抵抗が小さなゴム製のものを使用し
た。 組み立てられたガス吹込み管体３を、試堀した窪地２
内に配置し、最下層の単層管体3aが埋まる量の砂を敷き
詰めて砂層４を形成した。そして、砂層４の上に、厚み
2.3cmで樹脂ビーズ５を散布した後、縦管3x,3y,3zにプ
ラグ７を挿通させて型枠６を配置した。 そして、ボイラー12から給気ポンプ11及び給気管10を
経てガス吹込み管体３に温度100℃の水蒸気を毎分0.1m3
の流量で供給した。吹込み開始当初は、最下層の単層管
体3aから砂層４を経由して樹脂ビーズ５に水蒸気が供給
され、その部分の樹脂ビーズ５の発泡が行われた。 樹脂ビーズ５が発泡するに従って、その容積が増大し
た。そこで、プラグ７を毎分5cmの速度で上昇させなが
ら、水蒸気の吹込みを16分間継続した。 このようにして、樹脂ビーズ５の発泡を行わせた後、
型枠６を取り外し、樹脂発泡体を垂直方向に切り出し
た。そして、樹脂発泡体の断面を観察したところ、垂直
方向に関する発泡状態の変化は認められなかった。ま
た、垂直方向に関する樹脂発泡体の耐圧縮強度も1.5〜
2.0kg/cm2の範囲にあり、車輛走行時に加わる平均的な
踏圧である0.5kg/cm2よりも充分に大きな値であった。 更に、発泡樹脂体の内部にガス吹込み管体３が補強材
として配設されているため、走行車輛等による踏圧の大
半がガス吹込み管体３で受け止められ、強固な地盤とし
て使用することができる。また、ガス吹込み管体３の最
下層管体3aに杭13を取り付け、この杭13を窪地２の底面
に打ち込むと、発泡樹脂体が原地盤１の所定位置に確実
に確保される。 以上の実施例では、窪地２の盛土を例にとって説明し
ているが、同様の方法によって傾斜地の造成や路幅の拡
張等に本発明を適用することもできる。このような工事
においては、樹脂発泡体の一側面が開放されているの
で、原地盤の所定位置に発泡樹脂体を固定する杭13の作
用がより顕著に現れる。Hereinafter, the present invention will be described in detail with reference to the drawings by using an example applied to embankment of a depression. In this embodiment, as shown in FIGS. 1 and 2, a predetermined embankment is formed in a depression 2 having a depth of 80 cm formed in the original ground 1. At this time, the gas injection pipe 3 is disposed inside the depression 2. If necessary, the bottom of the depression is filled with sand 4 and the lower part of the gas injection pipe 3 is buried in the sand layer 4. The sand layer 4 is effective in uniformly supplying a heated gas such as water vapor to the resin beads 5 particularly at the beginning of foaming. As shown in FIG. 2, the gas injection pipe 3 is composed of single-layer pipes 3a, 3b, 3c,.
It is configured by connecting in x, 3y, 3z.
Further, a plurality of gas ejection holes 3p communicating with the inside are formed in the peripheral surface of these pipes. The single-layer tubes 3a, 3b, 3c
.. Are stacked in accordance with the depth of the depression 2 using the embankment. Therefore, each single-layer tube 3a, 3b,
3c ... vertical tube 3x, 3
It is preferable that y and 3z be detachable. The upper end of the vertical pipe 3z at the top is open.
Then, from this opening end, the plug 7 inserted into the through hole 6a of the mold 6 is inserted into the vertical tubes 3z, 3y, 3x. The vertical pipe in the place where the plug 7 is inserted (the vertical pipe in the middle stage in FIG. 2)
The gas outlet 3p of 3y and the uppermost vertical pipe 3z) is closed, and the gas outlet 3p of the lowermost 3x located below the lower end of the plug 7 is opened. The plug 7 is integrally fixed to the top plate 8. The top plate 8 can be raised and lowered by a lifting cylinder 9.
The lifting cylinder 9 is driven by a program in which the progress of the foaming reaction according to the type of the resin beads 5 to be used is previously taken. Alternatively, the plug 7 may be raised by detecting the progress of foaming inside the depression 2 and driving the lifting / lowering cylinder 9 according to the height of the foam. As the plug 7 rises, the position where the gas outlet 3p is closed by the plug 7 moves upward. An air supply pipe 10 is closed in the lowermost single-layer pipe 3a.
The air supply pipe 10 is connected to the boiler 12 via the air supply pump 11.
Is connected to Thereby, the steam generated in the boiler 12 is sent into the gas injection pipe 3 by the air supply pump 11 and then blown into the layer of the resin beads 5 via the sand layer 4 or directly. The temperature of the steam depends on the type of the resin beads 5, but in the case of a styrene resin, steam of about 80 to 120 ° C. is used. As the resin beads, a styrene resin having an average particle size of 0.9 mm was used. This resin starts a foaming reaction in relation to temperature and time as shown in FIG. 3, and expands to a foam having a foaming ratio of about 30 to 45 at the end of the reaction, and has a density of about 0.
It was 015 g / cm 3 . The effects of temperature and time on the foaming reaction are determined by the type of resin beads. As the depression 2, a sample having a cross section of 1m x 1m and a depth of 80cm was tested. 1mm diameter gas injection hole 3p in steel pipe with 20mm inside diameter 1 / cm 2
The single-layer pipes 3a, 3b, 3c are obtained by combining eight pipes in a vertical and horizontal direction at 23cm intervals, and the same single-layer pipes 3a, 3b, 3c are formed at intervals of 30cm. The gas injection pipe 3 was connected by connecting the vertical pipes 3a and 3b. In addition, the uppermost single-layer tube 3c
Was connected to a vertical tube 3z having a length of 25 cm. Further, a mold 6 having a plug 7 having a diameter of 20 cm and a length of 75 cm was prepared at a position corresponding to the uppermost vertical tube 3z. As the plug 7, a rubber plug having good adhesion to the inner wall surfaces of the vertical tubes 3x, 3y, and 3z and low frictional resistance was used. The hollow 2 where the assembled gas injection pipe 3 was tested
And a sand layer 4 was formed by spreading the sand in such an amount that the lowermost single-layer tube 3a was filled. And, on the sand layer 4, thickness
After the resin beads 5 were scattered at 2.3 cm, the plugs 7 were inserted through the vertical tubes 3x, 3y, 3z, and the mold 6 was arranged. Then, steam at a temperature of 100 ° C. is supplied from the boiler 12 to the gas injection pipe 3 through the air supply pump 11 and the air supply pipe 10 at a rate of 0.1 m 3 per minute.
At a flow rate of At the beginning of the blowing, steam was supplied from the lowermost single-layer tube 3a to the resin beads 5 via the sand layer 4, and the resin beads 5 in that portion were foamed. As the resin beads 5 foamed, the volume increased. Then, while the plug 7 was raised at a speed of 5 cm per minute, the blowing of steam was continued for 16 minutes. After the resin beads 5 are foamed in this manner,
The mold 6 was removed, and the resin foam was cut out in the vertical direction. When the cross section of the resin foam was observed, no change in the foaming state in the vertical direction was observed. Also, the compressive strength of the resin foam in the vertical direction is 1.5 to
The value was in the range of 2.0 kg / cm 2 , which was sufficiently larger than 0.5 kg / cm 2, which is the average tread pressure applied during vehicle running. Further, since the gas injection pipe 3 is provided as a reinforcing material inside the foamed resin body, most of the tread pressure caused by a running vehicle or the like is received by the gas injection pipe 3 and used as a solid ground. Can be. Further, when the pile 13 is attached to the lowermost pipe 3a of the gas injection pipe 3 and the pile 13 is driven into the bottom of the depression 2, the foamed resin body is reliably secured at a predetermined position on the original ground 1. In the above embodiment, the embankment of the depression 2 is described as an example. However, the present invention can be applied to the creation of a sloping land, the expansion of the road width, and the like by the same method. In such a construction, since one side surface of the resin foam is open, the action of the pile 13 for fixing the foam resin body at a predetermined position on the original ground appears more remarkably.
以上に説明したように、本発明においては、樹脂ビー
ズの発泡を現場で行って地盤を構築する際に、樹脂ビー
ズの発泡に合わせて発泡用の気体の吹込み高さを調節し
ている。そのため、発泡後の樹脂は、垂直方向に関して
ほぼ一様な発泡状態となり、局部的に圧縮強度が低下す
ることがなくなる。また、ガス吹込みに使用された管体
は、発泡樹脂体の補強材として働くため、より強固な地
盤が構築される。As described above, in the present invention, when the resin beads are foamed on site to construct the ground, the blowing height of the gas for foaming is adjusted in accordance with the foaming of the resin beads. Therefore, the foamed resin is in a substantially uniform foamed state in the vertical direction, and the compressive strength is not locally reduced. Further, the pipe used for gas injection works as a reinforcing material for the foamed resin body, so that a stronger ground is constructed.
第１図は本発明を窪地の盛土に適用した実施例を説明す
るための図、第２図はその断面を示した仮想斜視図、第
３図は発泡状態を温度及び時間との関係で表したグラフ
である。 １……原地盤、２……傾斜面 ３……ガス吹込み管体、3a〜3c:単層管体 3x〜3z:縦管、3p:ガス噴出孔 ４……砂層、５……樹脂ビーズ ６……型枠、７……プラグ ８……天板、９……昇降シリンダ 10……給気管、11……給気ポンプ 12……ボイラー、13……杭FIG. 1 is a view for explaining an embodiment in which the present invention is applied to embankment of a depression, FIG. 2 is a virtual perspective view showing a cross section thereof, and FIG. 3 shows a foaming state in relation to temperature and time. It is the graph which did. 1 ... Original ground, 2 ... Inclined surface 3 ... Gas injection pipe, 3a-3c: Single-layer pipe 3x-3z: Vertical pipe, 3p: Gas ejection hole 4 ... Sand layer, 5 ... Resin beads 6 ... Mold, 7 ... Plug 8 ... Top plate, 9 ... Lifting cylinder 10 ... Air supply pipe, 11 ... Air supply pump 12 ... Boiler, 13 ... Pile
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 17/18 E02D 3/00 E01C 3/00──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) E02D 17/18 E02D 3/00 E01C 3/00
Claims (1)
に配置し、該ガス吹込み管体の隙間に発泡性樹脂のビー
ズを充填し、前記ガス吹込み管体の上側開口部に型枠に
穿設した貫通孔にプラグを挿入し、前記ガス吹込み管体
から前記ビーズ中に加熱気体を吹き込むことによって前
記発泡性樹脂を発泡させ、発泡による樹脂の体積膨張に
応じて前記プラグを上昇させながら加熱気体の吹込みを
継続することを特徴とする発泡樹脂を使用した土木工
法。1. A gas injection pipe having a three-dimensional lattice shape is disposed on an original ground, and a gap between the gas injection pipes is filled with beads of a foamable resin, and an upper opening of the gas injection pipe is provided. A plug is inserted into a through-hole formed in the formwork at the portion, and the foaming resin is foamed by blowing a heated gas into the beads from the gas blowing tube, and according to the volume expansion of the resin due to foaming. A civil engineering method using a foamed resin, wherein blowing of a heated gas is continued while raising the plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10700390A JP2772991B2 (en) | 1990-04-23 | 1990-04-23 | Civil engineering method using foamable resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10700390A JP2772991B2 (en) | 1990-04-23 | 1990-04-23 | Civil engineering method using foamable resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH045318A JPH045318A (en) | 1992-01-09 |
| JP2772991B2 true JP2772991B2 (en) | 1998-07-09 |
Family
ID=14448026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10700390A Expired - Lifetime JP2772991B2 (en) | 1990-04-23 | 1990-04-23 | Civil engineering method using foamable resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2772991B2 (en) |
-
1990
- 1990-04-23 JP JP10700390A patent/JP2772991B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH045318A (en) | 1992-01-09 |
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