JPH0635794B2 - Friction reducer used in pipe propulsion method - Google Patents
Friction reducer used in pipe propulsion methodInfo
- Publication number
- JPH0635794B2 JPH0635794B2 JP16439488A JP16439488A JPH0635794B2 JP H0635794 B2 JPH0635794 B2 JP H0635794B2 JP 16439488 A JP16439488 A JP 16439488A JP 16439488 A JP16439488 A JP 16439488A JP H0635794 B2 JPH0635794 B2 JP H0635794B2
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- friction reducing
- fiber
- friction
- water
- 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
- 239000003638 chemical reducing agent Substances 0.000 title claims description 38
- 238000000034 method Methods 0.000 title description 8
- 239000000835 fiber Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 239000002562 thickening agent Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 5
- 229920002972 Acrylic fiber Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 229920006322 acrylamide copolymer Polymers 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical group OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims 1
- SKMHHHHLLBKNKR-UHFFFAOYSA-M sodium;prop-2-enamide;prop-2-enoate Chemical compound [Na+].NC(=O)C=C.[O-]C(=O)C=C SKMHHHHLLBKNKR-UHFFFAOYSA-M 0.000 claims 1
- 239000002250 absorbent Substances 0.000 description 22
- 230000002745 absorbent Effects 0.000 description 17
- 230000001603 reducing effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- NPERTKSDHFSDLC-UHFFFAOYSA-N ethenol;prop-2-enoic acid Chemical compound OC=C.OC(=O)C=C NPERTKSDHFSDLC-UHFFFAOYSA-N 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 229940047670 sodium acrylate Drugs 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- WWAZUUULUNZNFE-UHFFFAOYSA-N [Na].NC(=O)C=C Chemical compound [Na].NC(=O)C=C WWAZUUULUNZNFE-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ この発明は、下水道工事等で管渠を布設する場合の推進
工法において、地中管を元押ジャッキにより推進する際
に推進抵抗を減少させるために管体と地山との間に使用
する摩擦減少剤に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention reduces propulsion resistance when a subterranean pipe is propelled by an original push jack in a propulsion method for laying a pipe in sewer work or the like. The present invention relates to a friction reducing agent used between a pipe and a ground.
＜従来の技術＞ 従来、直径が 600mm〜3000mmのヒューム管等を地中に埋
設施工する工法として、地表に開口する立杭から横方向
に切羽を推進しながら埋設する管をジャッキ等で順次押
込む推進工法が知られている。この工法においては、管
体の推進距離が長くなるほど推進抵抗が増大してくるの
で、その推進抵抗をできるだけ小さくするために、地山
と管体との間に摩擦減少剤が使用されている。これは推
進抵抗が小さければ、一つの立杭からの推進可能な距離
が長くなり、推進距離が長くなるとそれだけ立杭の数が
少なくなるから、施工費を節約でき、さらに工期の短縮
や地表物への影響の減少などの点で非常に有利だからで
ある。<Prior art> Conventionally, as a method of burying Hume pipes with a diameter of 600 mm to 3000 mm in the ground, the pipes to be buried are pushed sequentially with jacks while pushing the face laterally from the vertical piles that open to the surface. The propulsion method is known. In this construction method, the propulsion resistance increases as the propulsion distance of the pipe increases, so a friction reducing agent is used between the ground and the pipe to minimize the propulsion resistance. This means that if the propulsion resistance is small, the distance that can be propelled from one vertical pile will be long, and if the propulsion distance is long, the number of vertical piles will be reduced accordingly, so the construction cost can be saved, and the construction period can be shortened and This is because it is very advantageous in terms of reducing the effect on
従来の摩擦減少剤としては、ベントナイト、鉱油、アク
リル酸ソーダ、ＣＭＣ（ガルボキシメチルセルローズ）
等を水に分散混合せしめて使用する標準滑剤が周知であ
る。Conventional friction reducing agents include bentonite, mineral oil, sodium acrylate, CMC (galboxymethyl cellulose)
Standard lubricants which are used by dispersing and mixing the above in water are well known.
このほかに、特開昭58-27774号公報に、水を吸収すると
球状弾性体となる高吸水性高分子物質の吸水とした球状
弾性体を摩擦減少剤として用いることが開示されてい
る。In addition, Japanese Patent Laid-Open No. 58-27774 discloses the use of a spherical elastic body as a friction-reducing agent, which absorbs water and becomes a spherical elastic body.
また、特開昭56-26994号公報に、植物油または鉱物油に
対し高分子系増粘剤と有機または無機繊維物質を混合し
たものを水で稀釈溶解して使用する摩擦減少剤が開示さ
れており、繊維物質としては繊維長0.5〜0.1mmの石綿が
例示されている。Further, JP-A-56-26994 discloses a friction-reducing agent used by diluting and dissolving a mixture of a polymeric thickener and an organic or inorganic fiber substance in a vegetable oil or a mineral oil, and diluting and dissolving the mixture in water. Asbestos having a fiber length of 0.5 to 0.1 mm is exemplified as the fiber substance.
なお、これらの滑材もしくは摩擦減少剤はポンプを用い
て地山と管体外面との間に継続的に注入しているのが普
通である。In addition, it is usual that these lubricants or friction reducing agents are continuously injected between the ground and the outer surface of the pipe body by using a pump.
＜発明が解決しようとする課題＞ 地中管を布設する地中土質は、各現場で微妙に異ってい
る。土質が礫混じり砂層である場合は、注入した滑材が
地山中に移行し易く、管体表面の滑材が短時間で減少し
て摩擦減少効果が稀薄となる問題がある。この傾向は前
記高吸水性高分子物質を用いた摩擦減少剤においても認
められ、また前記繊維物質を用いた摩擦減少剤において
も認められる。砂礫層における摩擦減少剤の地山への移
行は、注入後の時間の経過と共に進行し、摩擦減少剤の
粘性の大小にあまり関係がない。<Problems to be solved by the invention> The underground soil quality for laying underground pipes differs slightly at each site. When the soil is a sand layer containing gravel, the injected lubricant easily migrates into the ground, and the lubricant on the surface of the pipe body is reduced in a short time, resulting in a weak friction reducing effect. This tendency is also observed in the friction reducing agent using the super absorbent polymer, and also in the friction reducing agent using the fiber material. The transfer of the friction-reducing agent to the ground in the gravel layer progresses with the passage of time after the injection, and has little relation to the viscosity of the friction-reducing agent.
推進工法においては管体が連続して後部より圧入されて
全長が数百ｍに達することがある。このように全長が長
くなると、土質が砂礫層である場合に従来の摩擦減少剤
では地山に移行した分を補う注入量が増大し、全長にわ
たって不足なく摩擦減少剤を十分に供給することが困難
となるから、一つの立杭から所定の方向へ伸びる管の長
さをある程度短くせざるをえない問題があった。In the propulsion method, the pipe body may be continuously press-fitted from the rear part to reach the total length of several hundred m. When the total length is increased in this way, when the soil is a gravel layer, the conventional friction reducing agent increases the injection amount that compensates for the amount that has moved to the ground, and it is possible to sufficiently supply the friction reducing agent throughout the entire length. Since it becomes difficult, there is a problem that the length of the pipe extending from one vertical pile in a predetermined direction must be shortened to some extent.
砂礫層において推進工法を適用する際に使用する摩擦減
少剤の地山への移行を防止するには、ある程度長い繊維
を混入することが考えられるが、石綿やパルプ綿では、
沈降し易いから分散性に問題があり、固さのあるもので
あるから流動性にも問題があり、従って繊維が均一に分
散した状態で管体外面と地山との間に供給することが困
難であり、ごわごわしてポンプによる円滑な注入も保証
できない。To prevent the friction-reducing agent used when applying the propulsion method in the gravel layer from being transferred to the ground, it is conceivable to mix some long fibers, but with asbestos and pulp cotton,
Since it is easy to settle, there is a problem in dispersibility, and since it has hardness, it also has a problem in fluidity. Therefore, it is possible to supply it between the outer surface of the pipe and the ground with the fibers uniformly dispersed. Difficult and stiff and cannot guarantee smooth pumping.
この発明は、前述したようなことから、砂礫層において
前進工法を適用する際に使用する摩擦減少剤が地山へ移
行し難いようにすると共にポンプによる注入に支障がな
いようにすることを課題とする。As described above, the present invention aims to make it difficult for the friction reducing agent used when applying the advancing method in the gravel layer to migrate to the ground level and not to hinder the injection by the pump. And
＜課題を解決するための手段＞ この発明の手段は、少なくとも吸水した高吸水性粒状樹
脂と高分子増粘剤とを水に分散せしめた摩擦減少剤中
に、吸水した高吸水性繊維を分散せしめたことを特徴と
する。<Means for Solving the Problems> The means of the present invention is to disperse water-absorbed superabsorbent fibers in a friction reducing agent in which at least water-absorbed superabsorbent granular resin and a polymer thickener are dispersed in water. Characterized by the fact that
前記高吸水性繊維としては、高吸水性アクリル繊維又は
高吸水性アクリル酸ソーダ・アクリルアミド共重合体繊
維をベースにしたものがよい。The super absorbent fibers are preferably those based on super absorbent acrylic fibers or super absorbent sodium acrylamide / acrylamide copolymer fibers.
前記高吸水性粒状樹脂としては、ビニルアルコール・ア
クリル酸共重合体をベースにしたものがよい。The super absorbent polymer is preferably based on a vinyl alcohol / acrylic acid copolymer.
前記高分子増粘剤としては、ポリアクリル酸ソーダがよ
い。The polymer thickener is preferably sodium polyacrylate.
また、前記手段において、ベンナイトを混入するのがよ
い。Further, in the above means, it is preferable to mix Bennite.
＜作用＞ この発明の手段によれば、吸水した高吸水性粒状樹脂及
び吸水した高吸水性繊維を水に分散させたものであるか
ら、砂礫層に使用した場合、増粘した水が地山の大小の
微小間隙を通って地山側へ移行しようとするが、その微
小間隙を高吸水性粒状樹脂と高吸水性繊維とが混じり合
った状態で塞ぎ、摩擦減少剤を構成する増粘した水が地
山へ移行することを防止する。<Action> According to the means of the present invention, since the water-absorbed superabsorbent granular resin and the water-absorbed superabsorbent fiber are dispersed in water, when the sand-gravel layer is used, thickened water is not a natural substance. It tries to move to the ground side through the small and large microscopic gaps, but it closes the microscopic gaps in a state where the super absorbent polymer and super absorbent fiber are mixed, and the thickened water that constitutes the friction reducing agent. Prevent the landlord from migrating to the ground.
高吸水性粒状樹脂の混入は、従来使用されているように
そのベアリング作用（摩擦減少作用）、保水性の良さ、
地山へ移行し難いこと等を利用するのである。Incorporation of highly water-absorbent granular resin has its bearing action (friction reducing action), good water retention, as used conventionally.
It utilizes the fact that it is difficult to move to the ground.
そして、高吸水性繊維の混入は、高吸水性粒状樹脂が粒
状であるために単独では粒子間に必然的に生じる間隙を
埋める形で膨潤した高吸水性繊維が位置するように考え
たものであり摩擦減少剤中の水が地山の微小間隙へ移行
しようとする際に、高吸水性粒状樹脂並びに地山の砂粒
の微小間隙を高吸水性繊維が塞ぐように作用する。これ
によって水が地山へ移行することを防止する。吸水して
膨潤した高吸水性繊維を水中に分散させたものは、流動
性が良く滑剤としても作用する。また、水中に分散させ
た高吸水性繊維は、繊維長さが相当に長くても流動性が
よく、実験では繊維長が80mm程度であっても支障なくポ
ンプで給送できた。Then, the mixing of the super absorbent fibers is such that the super absorbent fibers are swollen in such a manner that the super absorbent particles are singly filled because they are granular because the super absorbent granular resin is granular. Yes When the water in the friction reducing agent tries to migrate to the fine gaps of the natural ground, the superabsorbent fiber acts so as to close the fine gaps of the super absorbent polymer and the sand grains of the natural ground. This prevents the water from moving into the ground. A product obtained by dispersing superabsorbent fibers which have absorbed water and swelled in water has good fluidity and also acts as a lubricant. In addition, the superabsorbent fiber dispersed in water had good fluidity even if the fiber length was considerably long, and in the experiment, even if the fiber length was about 80 mm, it could be pumped without any trouble.
高分子増粘剤の混入は、吸水した高吸水性粒状樹脂が水
中で浮上するものであり、吸水した高吸水性繊維が水中
で沈降するものであることから、粘度を高めることによ
って高吸水性粒状樹脂及び高吸水性繊維が分散した状態
を維持するようにしたものである。The mixing of the polymeric thickener is such that the absorbed water-absorbent granular resin floats in water, and the absorbed water-absorbent fibers settle in water, thus increasing the viscosity The particulate resin and the super absorbent fiber are maintained in a dispersed state.
また、ベントナイトを混入する場合は、主にその増粘剤
としての作用を利用するものであり、高分子増粘剤の混
入量をある程度減じることができる。なお、ベントナイ
トの懸濁液はチキソトロピー性があるため、注入後のゲ
ル化により摩擦減少剤の地山の移行をある程度防止する
作用が得られる。When bentonite is mixed, its action as a thickener is mainly used, and the mixed amount of the polymeric thickener can be reduced to some extent. Since the suspension of bentonite has thixotropic properties, gelation after injection has the effect of preventing the migration of the friction reducing agent to a certain extent.
＜実施例＞ この発明の１実施例を次に説明する。高吸水性繊維とし
て旭化成工業株式会社製のカシミロンＫＫＦ（商品名、
吸水性が重量で150 倍のアクリル繊維）の繊維長さを約
５mmとしたものを用い、この高吸水性繊維0.15kgを190
の水に混入しよく撹拌して分散せしめる。同繊維が膨
潤した後に、ベントナイト8.4kg、高吸水性粒状樹脂と
して住友化学工業株式会社製スミカゲルＳ−50（商品
名、吸水性が重量で約 600倍、吸水状態で直径約２mmの
球形）を用い、この高吸水性粒状樹脂0.15kg、高分子増
粘剤としてポリアクリル酸ソーダ0.2kgを投入し、撹拌
して均一に分散せしめると約10分後に粘度が640cpsの粘
性のある摩擦減少剤が得られる。<Example> One example of the present invention will be described below. As a super absorbent fiber, Kashimilon KKF (trade name, manufactured by Asahi Kasei Corporation)
Acrylic fibers with a water absorption capacity of 150 times by weight) with a fiber length of about 5 mm are used.
Mix well with water and stir well to disperse. After the fiber swelled, 8.4 kg of bentonite, Sumika Gel S-50 manufactured by Sumitomo Chemical Co., Ltd. as a highly water-absorbent granular resin (trade name, water absorption is about 600 times by weight, water absorption is a spherical shape with a diameter of about 2 mm) Using 0.15 kg of this highly water-absorbent granular resin, 0.2 kg of sodium polyacrylate as a polymeric thickener, and stirring and evenly dispersing, after about 10 minutes the viscosity of 640 cps is a viscous friction reducing agent. can get.
この実施例と比較のために、比較例として前記実施例の
配合から高吸水性繊維を除き高吸水性粒状樹脂を0.2kg
に増加させた摩擦減少剤を作った。その10分後の粘度は
1120cps であった。For comparison with this example, as a comparative example, 0.2 kg of superabsorbent granular resin excluding superabsorbent fibers from the formulation of the above example.
Made an increased friction reducer. The viscosity after 10 minutes is
It was 1120 cps.
この実施例と比較例について行った網目通過性及び摩擦
減少効果のテスト及びその結果を次に示す。The test and the result of the mesh passability and the friction reducing effect performed for this example and the comparative example are shown below.
網目通過テストは、内径55mm、長さ230mmの透明アクリ
ル製円筒の一端に40メッシュの金網を固定して底を形成
し、この円筒容器内に摩擦減少剤を収容して時間の経過
に対する液面の低下長さを測定する。実施例及び比較例
共に調整後24時間放置してから、400cc を前記円筒容器
内に収容して測定した。結果を第１図に示す。なお、24
時間放置後の粘度は実施例のもので6000cps 、比較例の
もので5300cps であった。第１図のグラフから理解でき
るように、実施例のものは最初の１〜２分の間に僅かな
（１mm程度）液面の低下が認められるがそれ以後は液面
の低下がなく、比較例のものは初めから約30分を経過す
るまでは液面が低下し、その後は殆ど低下しない。この
結果から、膨潤した高吸水性繊維は実施例の摩擦減少剤
が直ちに網目を塞いで増粘した水の流出を阻止する作用
に大きく貢献していることがわかる。なお、実施例の配
合から高吸水性繊維の量を0.1kg に、さらに0.075kg に
減少させると、網目通過テストにおいて3.5mm と４mmと
に液面が低下するがそれ以上の低下は認められなかっ
た。In the mesh passage test, a mesh of 40 mesh is fixed to one end of a transparent acrylic cylinder with an inner diameter of 55 mm and a length of 230 mm to form a bottom, and a friction reducing agent is contained in this cylindrical container to keep the liquid surface against the passage of time. Measure the drop length. Both the examples and the comparative examples were left for 24 hours after the adjustment, and then 400 cc was housed in the cylindrical container for measurement. The results are shown in Fig. 1. 24
The viscosity after standing for a time was 6000 cps in the example and 5300 cps in the comparative example. As can be seen from the graph of FIG. 1, in the example, a slight (about 1 mm) drop in the liquid level was observed during the first 1-2 minutes, but no further drop in the liquid level was observed thereafter. In the case of the example, the liquid level drops from the beginning until about 30 minutes have passed, and thereafter it hardly drops. From this result, it is understood that the swollen superabsorbent fiber greatly contributes to the action of the friction-reducing agent of the example immediately blocking the mesh and preventing the outflow of the thickened water. When the amount of superabsorbent fiber was reduced to 0.1 kg and further to 0.075 kg from the formulation of Example, the liquid level was lowered to 3.5 mm and 4 mm in the mesh passing test, but no further reduction was observed. It was
摩擦減少効果のテストは、第２図に示すように摩擦減少
剤を４箇所から注入できるようにパイプ（内径５mm）１
を埋込んだコンクリート棒（70Φ×980mm）を各別に砂
層３及び砂礫層４の中に一定の深さで位置するように入
れ、この棒２を一定速度（50mm／min ）で移動させ、摩
擦減少剤を注入しない場合、実施例及び比較例の摩擦減
少剤を夫々注入した場合について摩擦抵抗を力検出器５
で測定した。その結果を表１に示す。使用した試験機は
ストログラフＲ（株式会社東洋精機製作所の商品名）で
ある。前記砂層３の組成は、粒径と重量割合で示すと、
粗砂分（２〜0.42mm）41％、細砂分（0.42〜0.074mm）5
9％であり、前記砂礫層４の組成は、同様に、礫分（4.7
6mm以上の粒子）30％、細礫分（4.76〜２mm）24％、粗
砂分（２〜0.42mm）18.86％、細砂分（0.42〜0.074mm）
27.14％である。As shown in Fig. 2, the test of the friction reducing effect was carried out by using a pipe (inner diameter 5 mm) 1 so that the friction reducing agent could be injected from 4 points
Insert concrete rods (70Φ x 980mm) with embedded so that they are located in sand layer 3 and gravel layer 4 at a certain depth, move this rod 2 at a constant speed (50mm / min), and rub it. In the case where the reducing agent is not injected, and when the friction reducing agents of the example and the comparative example are respectively injected, the friction resistance is measured by the force detector 5.
It was measured at. The results are shown in Table 1. The test machine used is Strograph R (trade name of Toyo Seiki Seisakusho Co., Ltd.). The composition of the sand layer 3 is expressed in terms of particle size and weight ratio,
Coarse sand content (2-0.42mm) 41%, Fine sand content (0.42-0.074mm) 5
9%, and the composition of the gravel layer 4 is the same as the gravel content (4.7
6 mm or more) 30%, fine gravel (4.76-2 mm) 24%, coarse sand (2-0.42 mm) 18.86%, fine sand (0.42-0.074 mm)
27.14%.
表１から摩擦減少率Ｓ（％）を算出すると表２のように
なる。なお、摩擦減少率の計算式は次式による。 When the friction reduction rate S (%) is calculated from Table 1, Table 2 is obtained. The formula for calculating the friction reduction rate is as follows.
Ａｏは摩擦減少剤を注入しない場合の摩擦抵抗値、Ｘは
摩擦減少剤を注入した場合の摩擦抵抗値である。 Ao is the frictional resistance value when the friction reducing agent is not injected, and X is the frictional resistance value when the friction reducing agent is injected.
表２から明らかなように、砂礫層４に対する実施例の摩
擦減少効果は非常に顕著である。また、摩擦減少剤の注
入量は300cc と450cc の２例を示したが、注入量が多い
方が効果が大きい。 As is clear from Table 2, the friction reducing effect of the example on the gravel layer 4 is very remarkable. The injection amount of friction-reducing agent was 300cc and 450cc, but the larger the injection amount, the greater the effect.
上記実施例の配合は、作業性並びにコスト面を考慮して
最も好ましい値を示したものであるが、夫々の原料の混
入量は次のように増減しても良好な結果が得られる。す
なわち、得ようとする摩擦減少剤の量を大略200kg とす
るとして水 190に対し、高吸水性繊維0.01〜1.1kg、
ベントナイト０〜50kg、高吸水性粒状樹脂0.05〜0.4k
g、高分子増粘剤0.05〜２kgの夫々の範囲内である。The blends of the above-mentioned examples show the most preferable values in consideration of workability and cost, but good results can be obtained even if the mixing amounts of the respective raw materials are increased or decreased as follows. That is, assuming that the amount of the friction-reducing agent to be obtained is approximately 200 kg, 0.01 to 1.1 kg of super absorbent fiber per 190 of water,
Bentonite 0-50kg, super absorbent granular resin 0.05-0.4k
g, polymeric thickener 0.05 to 2 kg.
また実施例における高吸水性繊維の長さを約５mmとした
が、３〜80mm程度までは使用可能であり、同様な効果が
得られる。Although the length of the super absorbent fiber in the examples is about 5 mm, it can be used up to about 3 to 80 mm, and the same effect can be obtained.
上記実施例において使用した高吸水性繊維のほかに、例
えば日本エクスラン工業株式会社製造のランシール−Ｆ
（商品名、超吸水加工した外層とアクリル繊維である内
層をもつ２槽構造の繊維）や住友化学工業株式会社製の
スミカゲルのＦタイプ（商品名、高吸水性の繊維でアク
リル酸ソーダ・アクリルアミド共重合体の繊維）などを
使用してもよい。In addition to the super absorbent fibers used in the above examples, for example, Lanseal-F manufactured by Japan Exlan Industrial Co., Ltd.
(Product name, two-tank structure fiber having an outer layer that is super absorbent and an inner layer that is acrylic fiber) and Sumika Gel F type manufactured by Sumitomo Chemical Co., Ltd. (Product name, super absorbent fiber made of sodium acrylate and acrylamide) Copolymer fibers) and the like may be used.
＜発明の効果＞ この発明によれば、高吸水性繊維を使用することによ
り、ポンプの作動に支障なく、しかも砂礫層に使用して
従来のものよりも地山へ移行し難くかつ摩擦減少効果の
大きい摩擦減少剤を提供できる。従って、管の推進工法
に使用して、従来よりも小さい圧力で管を推進できて省
エネルギ効果が得られ、また管の推進可能な距離が従来
よりも長くなり、工期を短縮でき、摩擦減少剤の使用量
が従来よりも少なくてよく、そしてこれらの理由で管渠
の布設コストを低減できる効果が得られる。<Effects of the Invention> According to the present invention, by using the super absorbent fiber, there is no hindrance to the operation of the pump, and moreover, it is used in the gravel layer so that it is harder to transfer to the ground than the conventional one and the friction reducing effect. It is possible to provide a large friction reducing agent. Therefore, it can be used in the pipe propulsion method to propel the pipe with a smaller pressure than before, resulting in an energy saving effect. Also, the propulsable distance of the pipe is longer than before, the construction period can be shortened, and friction can be reduced. The amount of the agent used may be smaller than before, and for these reasons, the effect of reducing the cost of laying the conduit can be obtained.
第１図はこの発明の実施例及び比較例の網目通過テスト
の結果を示す時間に対する液面の低下長さのグラフ、第
２図は摩擦減少効果のテストに用いた装置の概略側面図
である。 １……パイプ、２……コンクリート棒、４……砂礫層。FIG. 1 is a graph showing the drop length of the liquid surface with respect to time, showing the results of the mesh passage test of Examples and Comparative Examples of the present invention, and FIG. 2 is a schematic side view of the apparatus used for testing the friction reducing effect. . 1 ... pipe, 2 ... concrete rod, 4 ... gravel layer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 淳 兵庫県神戸市垂水区学が丘７丁目１―1742 (56)参考文献 特開 昭56−26994（ＪＰ，Ａ) 特開 昭58−27774（ＪＰ，Ａ) 特開 昭59−33381（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Atsushi Maeda Atsushi Maeda 7-1174 Gakugaoka, Tarumi-ku, Kobe-shi, Hyogo (56) References JP-A-56-26994 (JP, A) JP-A-58-27774 (JP) , A) JP-A-59-33381 (JP, A)
Claims (5)
分子増粘剤とを水に分散せしめた摩擦減少剤中に、吸水
した高吸水性繊維を分散せしめたことを特徴とする管の
推進工法に使用する摩擦減少剤。1. A propulsion of a pipe, characterized in that a superabsorbent fiber having absorbed water is dispersed in a friction reducing agent in which at least a superabsorbent granular resin which has absorbed water and a polymer thickener are dispersed in water. Friction reducing agent used in construction method.
前記高吸水性繊維が、高吸水性アクリル繊維又は高吸水
性アクリル酸ソーダ・アクリルアミド共重合体繊維をベ
ースにしたものである摩擦減少剤。2. The friction reducing agent according to claim 1, wherein:
A friction reducing agent, wherein the superabsorbent fiber is based on superabsorbent acrylic fiber or superabsorbent sodium acrylate-acrylamide copolymer fiber.
おいて、前記高吸水性粒状樹脂が、ビニルアルコール・
アクリル酸共重合体をベースにしたものである摩擦減少
剤。3. The friction reducing agent according to claim 1, wherein the super absorbent polymer is vinyl alcohol.
Friction modifiers based on acrylic acid copolymers.
載の摩擦減少剤において、前記高分子増粘剤が、ボリア
クリル酸ソーダである摩擦減少剤。4. The friction reducing agent according to any one of claims (1), (2) and (3), wherein the polymer thickening agent is sodium polyacrylate.
一つに記載の摩擦減少剤において、ベントナイトが混入
されている摩擦減少剤。5. The friction reducing agent according to any one of claims (1), (2), (3) and (4), wherein bentonite is mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16439488A JPH0635794B2 (en) | 1988-06-30 | 1988-06-30 | Friction reducer used in pipe propulsion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16439488A JPH0635794B2 (en) | 1988-06-30 | 1988-06-30 | Friction reducer used in pipe propulsion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0213697A JPH0213697A (en) | 1990-01-18 |
| JPH0635794B2 true JPH0635794B2 (en) | 1994-05-11 |
Family
ID=15792297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16439488A Expired - Lifetime JPH0635794B2 (en) | 1988-06-30 | 1988-06-30 | Friction reducer used in pipe propulsion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635794B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002038139A (en) * | 2000-07-26 | 2002-02-06 | Komatsu Im Engineering Kk | Lubricant for jacking method |
-
1988
- 1988-06-30 JP JP16439488A patent/JPH0635794B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0213697A (en) | 1990-01-18 |
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