JP4106694B2 - Tightening ring structure for ribbed pipe of flexible joint - Google Patents
Tightening ring structure for ribbed pipe of flexible joint Download PDFInfo
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- JP4106694B2 JP4106694B2 JP2004255274A JP2004255274A JP4106694B2 JP 4106694 B2 JP4106694 B2 JP 4106694B2 JP 2004255274 A JP2004255274 A JP 2004255274A JP 2004255274 A JP2004255274 A JP 2004255274A JP 4106694 B2 JP4106694 B2 JP 4106694B2
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- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 238000005452 bending Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 3
- 238000002788 crimping Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000221484 Tilletiaceae Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Description
本発明は、硬質塩化ビニル管等の外周にリブを有するリブ付管とマンホールとを接続する際に使用する可撓性継手のリブ付管用締付けリング構造であって、特に地震等による土圧の変化に追従して屈曲変位及び管軸方向の変位を確保するようにした可撓性継手のリブ付管用締付けリング構造に関するものである。 The present invention relates to a tightening ring structure for a ribbed tube of a flexible joint used when connecting a manhole with a ribbed tube having a rib on the outer periphery of a hard polyvinyl chloride tube or the like. The present invention relates to a tightening ring structure for a ribbed tube of a flexible joint, which is adapted to ensure a bending displacement and a displacement in the tube axis direction following the change.
従来、マンホールにリブ管を接続する構造としては、特許文献1に記載されたものがある。この文献の接続構造は、図７に示すように、リブ付きパイプ40をマンホール41に接続するためのマンホール継ぎ手42に関するものである。このマンホール継ぎ手42においては、リブ付きパイプ40を短管43に嵌挿し、短管43をサドル44に装着し、サドル44をマンホール側壁にモルタル等の結合材45で接続し、パイプ40のリブ47、47間に、リブ外周より大きめのパッキン46を装着することにより、リブ付きパイプ40と短管43の接続部を止水するようにしたものである。 Conventionally, as a structure for connecting a rib tube to a manhole, there is one described in Patent Document 1. The connection structure of this document relates to a manhole joint 42 for connecting a ribbed pipe 40 to a manhole 41, as shown in FIG. In this manhole joint 42, a pipe 40 with ribs is fitted into a short pipe 43, the short pipe 43 is attached to a saddle 44, the saddle 44 is connected to a manhole side wall with a bonding material 45 such as mortar, and a rib 47 of the pipe 40 is attached. , 47 is provided with a packing 46 larger than the outer periphery of the rib to stop the connection between the ribbed pipe 40 and the short pipe 43.
ところが、上記のモルタルによる接合は、不等沈下や地震などによりクラックが発生し易く、漏水や不明水の原因となる。このような欠点を解消すべく成されたものが特許文献２に記載された接続構造である。 However, the joining with the mortar described above tends to cause cracks due to unequal settlement, earthquakes, etc., causing water leakage and unknown water. The connection structure described in Patent Document 2 has been made in order to eliminate such drawbacks.
この特許文献２の構造は、図８に示すように、削孔50が設けられているマンホール51と、外周面にリブ52が設けられている管53とが、弾性を有する可撓性継手54によって連結されている接続構造であり、削孔50中には管53の端部が挿入される一方、可撓性継手54はマンホール51に取り付けられている固定部55、管53が挿入されている筒状部56及び固定部55と筒状部56とを連結する連結部57を備え、さらに筒状部56の内周面との間に設けられている止水材層58と、筒状部56の外周面に取り付けられている締結用部材59とを備えており、締結用部材59によって筒状部56および止水材層58が締めつけられ、止水材層58が管53の外周面のリブ52へと押圧されることによって、筒状部56と管53の外周面とが止水されるようにしたものである。
上記の特許文献２の接続構造において、可撓性継手54は、マンホール51の削孔の周囲に固定した部位と管53の外周に止水材層58を介して固定した部位とが可撓性を有する連結部57によって結合された構造により、マンホール51と管53との相対位置が地震等によって変化しても、その変位に追従して変形し得る構造としたものである。 In the connection structure of Patent Document 2 described above, the flexible joint 54 includes a portion fixed around the drilling hole of the manhole 51 and a portion fixed to the outer periphery of the tube 53 via the water blocking material layer 58. Even if the relative position between the manhole 51 and the pipe 53 changes due to an earthquake or the like, the structure coupled by the connecting portion 57 having the structure can be deformed following the displacement.
ところが、上記の構造において、可撓性の連結部が管の軸方向の変位に追従して変形し得る量は連結部の変形量に依存するものであり、許容される変形量を超えると、連結部が損傷或いは破裂し、漏水の原因となる。 However, in the above structure, the amount that the flexible connecting portion can be deformed following the displacement in the axial direction of the tube depends on the deformation amount of the connecting portion. The connecting part may be damaged or ruptured, causing water leakage.
また、特許文献２の構造においては、締結用部材59により筒状部56及び止水材層58が締め付けられ、止水材層58にリブ52の先端が食い込んで止水される構造としてあるため、止水材層58を設けた部位において、管軸方向の移動をなすことは不可能である。 Further, in the structure of Patent Document 2, the cylindrical portion 56 and the water stop material layer 58 are fastened by the fastening member 59, and the tip of the rib 52 bites into the water stop material layer 58 so that the water stops. It is impossible to move in the tube axis direction at the portion where the water blocking material layer 58 is provided.
本発明は、上記のような事情に鑑みてなされたもので、マンホールにリブ付き管を接続する継手構造において、この継手構造が、止水性、屈曲性、伸縮性及び可撓性を有し、地震時の土圧の変動にも適応する屈曲変位及び所定の管軸方向の変位を確保するようにした可撓性継手のリブ付管用締付けリング構造を提供することを目的とする。 The present invention has been made in view of the above circumstances, and in a joint structure for connecting a ribbed tube to a manhole, the joint structure has water-stopping properties, flexibility, stretchability, and flexibility, It is an object of the present invention to provide a flexible ring-fitting tube tightening ring structure for a flexible joint adapted to ensure a bending displacement and a predetermined displacement in the direction of the pipe axis that can be adapted to fluctuations in earth pressure during an earthquake.
上記の目的を達成するために、本発明の請求項１は、円筒状の大径部と小径部とを有する可撓性継手の前記大径部をマンホールの削孔に固着する一方、該可撓性継手に挿入されたリブ付き管の外周に該可撓性継手の小径部を嵌着し、該可撓性継手の小径部の外周に、周部の途中に切断部を有するリブ付締付けリングを嵌合すると共に、該締付けリングの外周に締付けバンドを嵌着して締結するようにした可撓性継手のリブ付管用締付けリング構造において、前記締付けリングのリブに切込みを設けたことによって前記リブ付き管の変形に追従して該締付けリングの外径を変形するようにしたことを特徴とする。 In order to achieve the above object, the first aspect of the present invention is to fix the large-diameter portion of a flexible joint having a cylindrical large-diameter portion and a small-diameter portion to a drilling hole of a manhole. The small diameter portion of the flexible joint is fitted to the outer periphery of the ribbed tube inserted into the flexible joint, and the rib tightening has a cutting portion in the middle of the peripheral portion of the small diameter portion of the flexible joint. In the tightening ring structure for a ribbed tube of a flexible joint in which a ring is fitted and a tightening band is fitted and fastened to the outer periphery of the tightening ring, the rib of the tightening ring is provided with a cut The outer diameter of the clamping ring is deformed following the deformation of the ribbed tube.
また、本発明の請求項２は、請求項１において、前記締付けリングのリブの所定箇所に設けた切込みはＶ字形溝であることを特徴とする。 According to a second aspect of the present invention, in the first aspect, the notch provided at a predetermined portion of the rib of the tightening ring is a V-shaped groove .
さらに、本発明の請求項３は、請求項１において、前記締付けリングのリブの所定箇所に設けた切込みは切込み溝であることを特徴とする。
Further, a third aspect of the present invention is characterized in that, in the first aspect , the notch provided in a predetermined portion of the rib of the tightening ring is a notch groove .
以上のように構成された発明により、締付けリングのリブに切込みを設けたことによってリブ付き管の変形に追従して該締付けリングの外径を変形し得る構造としたことにより、地震時等において土圧の変動が生じた際にも、リブ付き管の屈曲方向への変位に対しては、可撓性継手のゴム製弾性によって変形することにより対処することが可能となり、さらに管軸方向への変位に対しては、可撓性継手の小径部がリブ付き管の外周にて密着性を保ちながら滑り移動することによって対処することが可能となる。 With the invention configured as described above, by providing a notch in the rib of the tightening ring, the outer diameter of the tightening ring can be deformed following the deformation of the ribbed tube. Even when the earth pressure fluctuates, the displacement of the ribbed tube in the bending direction can be dealt with by deformation due to the rubber elasticity of the flexible joint, and further in the tube axis direction. It is possible to cope with this displacement by sliding the small diameter portion of the flexible joint while maintaining adhesion on the outer periphery of the ribbed tube.
また、本発明においては、地震時等の土圧の変動によって、リブ付き管が偏平した際にも、リブに設けたＶ字形溝或いは切込み溝によって、その偏平なる変形に追従して、締付けリングもまた変形することにより、管軸方向への変位に対しては、可撓性継手の小径部がリブ付き管の外周にて密着性及び止水性を保ちながら滑り移動することによって対処することが可能となる。 Further, in the present invention, even when the ribbed tube is flattened due to fluctuations in earth pressure during an earthquake or the like, the tightening ring follows the flat deformation by the V-shaped groove or the cut groove provided in the rib. Also, the deformation in the tube axis direction can be dealt with by the sliding movement of the small diameter portion of the flexible joint while maintaining the adhesion and water-stopping property on the outer periphery of the ribbed tube. It becomes possible.
以下、本発明の実施例について図面を参照しながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本発明による可撓性継手のリブ付管用締付けリング構造は、図１又は図２に示すように、円筒状の大径部4と小径部6とを有する可撓性継手3の大径部4をマンホール1の削孔2に固着する一方、該可撓性継手3に挿入されたリブ付き管5の外周に該可撓性継手3の小径部6を嵌着し、該可撓性継手3の小径部6の外周に、周部の途中に切断部８ａを有するリブ付締付けリング8を嵌合すると共に、該締付けリング8の外周に締付けバンド9を嵌着して締結するようにし、締付けリング8のリブ10に切込み（Ｖ字形溝22または切込み溝23）を設けたことによってリブ付き管の変形に追従して該締付けリングの外径を変形するようにしたものである。 The fastening ring structure for a ribbed pipe of a flexible joint according to the present invention has a large-diameter portion 4 of a flexible joint 3 having a cylindrical large-diameter portion 4 and a small-diameter portion 6 as shown in FIG. Is fixed to the drilling hole 2 of the manhole 1, while the small diameter portion 6 of the flexible joint 3 is fitted on the outer periphery of the ribbed tube 5 inserted into the flexible joint 3. A rib-fitted tightening ring 8 having a cut part 8a in the middle of the peripheral part is fitted to the outer periphery of the small-diameter part 6 and a fastening band 9 is fitted to the outer periphery of the tightening ring 8 and fastened. By providing a cut (V-shaped groove 22 or cut groove 23) in the rib 10 of the ring 8, the outer diameter of the tightening ring is deformed following the deformation of the ribbed tube.
このような構造についてより詳細に述べると、本実施例に使用された可撓性継手3は弾性を有するゴム製継手であって、その形状は円筒形の大径部4と円筒形の小径部6との間に斜形部12を有し、大径部4の内周には周形状の内周凹部13が形成され、また大径部4と斜形部12と境には外周に突出した鍔14が形成されている。 In more detail about such a structure, the flexible joint 3 used in this example is a rubber joint having elasticity, and the shape thereof is a cylindrical large diameter part 4 and a cylindrical small diameter part. 6 has a slanted portion 12, a circumferential inner recess 13 is formed on the inner periphery of the large-diameter portion 4, and projects to the outer periphery at the boundary between the large-diameter portion 4 and the slanted portion 12. A ridge 14 is formed.
このような可撓性継手3をマンホール1の削孔2に取り付けるには、可撓性継手3の大径部4の内周凹部13に断面コ字形の圧着リング15を装着する。この圧着リング15は、これを装着した状態で可撓性継手3の大径部4の内周凹部13を外方へ押圧する構造を有し、可撓性継手3の大径部4をマンホール1の削孔2に挿入すると共に、鍔14をマンホール1の壁部に当てることによって位置決めし、この状態で圧着リング15を拡径することによって、可撓性継手3の大径部4をマンホール1の削孔2に堅固に固定することができる。 In order to attach such a flexible joint 3 to the drilling hole 2 of the manhole 1, a crimp ring 15 having a U-shaped cross section is attached to the inner peripheral recess 13 of the large diameter portion 4 of the flexible joint 3. This crimping ring 15 has a structure in which the inner circumferential recess 13 of the large-diameter portion 4 of the flexible joint 3 is pressed outward in a state in which the crimping ring 15 is mounted, and the large-diameter portion 4 of the flexible joint 3 is 1 is inserted into the drilling hole 2 and positioned by placing the flange 14 against the wall of the manhole 1, and in this state, the diameter of the crimping ring 15 is expanded so that the large-diameter portion 4 of the flexible joint 3 is It can be firmly fixed in the 1 drilling hole 2.
また、リブ付き管5（一例として、リブ付き硬質塩化ビニル管）の一端付近におけるリブ5ａ、5ａ間にポリエチレン等によるリング状の緩衝材17を嵌合した状態で、該緩衝材17が圧着リング15の断面コ字形の内部に嵌合されるように嵌め込む。この状態で、可撓性継手3の小径部6の外周に締付けリング8を嵌合する。 Further, in the state where a ring-shaped cushioning material 17 made of polyethylene or the like is fitted between the ribs 5a and 5a in the vicinity of one end of the ribbed tube 5 (for example, a rigid polyvinyl chloride tube with a rib), the cushioning material 17 is a compression ring. It is fitted so that it fits inside the 15 U-shaped section. In this state, the fastening ring 8 is fitted to the outer periphery of the small diameter portion 6 of the flexible joint 3.
この締付けリング8は、硬質の合成樹脂より作製され、外周に所定の離間幅を有して複数のリブ10を形成している。本実施例においては、全部で３条のリブ10を有し、その間に２個の締付けバント9を締結し得る構造としてあるが、その他、リブを２条としてその間に１個のバンドを締結する構造としても良いし、３個以上のリブを形成して、２個以上のバンドで締結する構造としてもよい。 The fastening ring 8 is made of a hard synthetic resin and has a plurality of ribs 10 having a predetermined separation width on the outer periphery. In the present embodiment, there are a total of three ribs 10 and two fastening bunts 9 can be fastened between them, but in addition, two ribs are used and one band is fastened between them. A structure may be used, or three or more ribs may be formed and fastened with two or more bands.
また、この締付けリング8は、図３又は図５に示すように、周部の途中に切断部8ａを有する構造とされている。即ち、締付けリング8は切断部8ａで途中が途切れたＣ字形のような形状を有し、リブ10、10間に締め付けバント9を巻き付けて締結する際、切断部8ａの幅だけ縮径することができる。 Further, as shown in FIG. 3 or FIG. 5, the tightening ring 8 has a structure having a cut portion 8a in the middle of the peripheral portion. In other words, the tightening ring 8 has a C-like shape that is cut off at the cutting portion 8a, and when the tightening band 9 is wound between the ribs 10 and 10 and tightened, the diameter of the tightening ring 8 is reduced by the width of the cutting portion 8a. Can do.
さらに、この締付けリング8のリブ10には切込み（Ｖ字形溝21、22又は切込み溝23）が設けられている。本実施例において、切込みは、図３及び図４に示す形態と図５及び図６に示す形態がある。 Further, the rib 10 of the tightening ring 8 is provided with cuts (V-shaped grooves 21 and 22 or cut grooves 23). In this embodiment, the incision has a form shown in FIGS. 3 and 4 and a form shown in FIGS. 5 and 6.
即ち、図３及び図４に示す切込みは、締付けリング8のリブ10における切断部8ａを合致した際（図４に示す状態）にＶ字形となるＶ字形溝21とその対称位置のリブ10における部位にＶ字形溝22を設けたものである。なお、このような構造においては各リブ10の同位置にＶ字形溝21、22が設けられている。 That is, the notches shown in FIGS. 3 and 4 are formed in the V-shaped groove 21 which becomes V-shaped when the cut portion 8a in the rib 10 of the tightening ring 8 is matched (the state shown in FIG. 4) and the rib 10 at the symmetrical position. A V-shaped groove 22 is provided at the site. In such a structure, V-shaped grooves 21 and 22 are provided at the same positions of the ribs 10.
さらに、図５及び図６に示す切込みは、締付けリング8のリブ10における切断部8ａを一箇所として、該リブ10の上下左右の４箇所に切込み溝23を設けたものである。従って、図６に示すように、締付けリング8のリブ10における切断部8ａを合致した際、その合致部が切込み溝23の一箇所となり、他に３箇所の均等間隔位置に切込み溝23が設けられた構造となる。なお、このようにリブ10に切込み溝23を形成する構造においても、各リブ10の同位置に同様に切込み溝23を設けた構造となる。 Further, the cuts shown in FIG. 5 and FIG. 6 are provided with cut grooves 23 at four places on the rib 10 of the tightening ring 8 at four places on the top, bottom, left and right of the rib 10. Therefore, as shown in FIG. 6, when the cut part 8a in the rib 10 of the tightening ring 8 is matched, the matched part becomes one place of the cut groove 23, and the cut grooves 23 are provided at three other equally spaced positions. Structure. Note that the structure in which the cut grooves 23 are formed in the ribs 10 in this way is a structure in which the cut grooves 23 are similarly provided at the same positions of the ribs 10.
上記の構成により、可撓性継手3の小径部6の外周に締付けリング8を嵌合すると共に、締付けバンド9を装着して締付けると、締付けリング8を縮径してゴム製の小径部6がリブ付き管58の各リブ5ａ、即ち、図示のように複数個のリブ5ａ、5ａ…の外周に相当する部位にて締付けられ、その接触部においては密着性を保つことにより、マンホール1の内部の水圧及びマンホール1の外部の水圧に対する良好な止水性を発揮することができる。 With the above configuration, when the fastening ring 8 is fitted to the outer periphery of the small-diameter portion 6 of the flexible joint 3 and the fastening band 9 is attached and tightened, the diameter of the fastening ring 8 is reduced to reduce the small-diameter portion 6 made of rubber. Is tightened at each rib 5a of the ribbed tube 58, that is, at the portion corresponding to the outer periphery of the plurality of ribs 5a, 5a... A good water-stopping property against the internal water pressure and the water pressure outside the manhole 1 can be exhibited.
また、地震時等において土圧の変動が生じた際にも、リブ付き管5の屈曲方向への変位に対しては、可撓性継手3のゴム弾性によって変形することにより対処することができる。さらに管軸方向への変位に対しては、可撓性継手3の小径部6がリブ付き管5の外周にて密着性を保ちながら滑り移動することによって対処することができる。 In addition, when the earth pressure fluctuates during an earthquake or the like, the displacement of the ribbed tube 5 in the bending direction can be dealt with by deformation by the rubber elasticity of the flexible joint 3. . Furthermore, the displacement in the tube axis direction can be dealt with by the sliding movement of the small diameter portion 6 of the flexible joint 3 while maintaining the adhesiveness on the outer periphery of the ribbed tube 5.
特に、本発明においては、地震時等の土圧の変動によって、リブ付き管5が偏平した際にも、上記のように締付けリング8のリブ10に設けたＶ字形溝21、22或いは切込み溝23によって、その偏平なる変形に追従して、締付けリング8もまた変形することにより、管軸方向への変位に対しては、可撓性継手3の小径部6がリブ付き管5の外周にて密着性を保ちながら滑り移動することによって対処することができる。 In particular, in the present invention, even when the ribbed tube 5 is flattened due to fluctuations in earth pressure during an earthquake or the like, the V-shaped grooves 21 and 22 provided in the rib 10 of the tightening ring 8 or the cut grooves as described above. 23, the clamping ring 8 is also deformed following the flat deformation, so that the small-diameter portion 6 of the flexible joint 3 is placed on the outer periphery of the ribbed tube 5 with respect to displacement in the tube axis direction. It is possible to cope with this by sliding while maintaining adhesion.
なお、本実施例の構造を用いて試験を行った結果、レベル２程度の地震に適応する性能として、屈曲変位１°、かつ管軸方向の変位±６０mmの状態で、外水圧0.10ＭＰa及び内水圧0.05ＭＰaに耐える止水性を有することを確認することができた。この場合、リブ付き管5の管外径の４％の偏平した場合でも、上記と同様の屈曲変位及び管軸方向の変位に対する止水性を有することを確認することができた。 As a result of testing using the structure of this example, the external water pressure of 0.10 MPa and the internal pressure in a state where the bending displacement is 1 ° and the displacement in the tube axis direction is ± 60 mm as performance suitable for level 2 earthquakes. It was confirmed that the water pressure resistance of the water pressure was 0.05 MPa. In this case, even when the ribbed tube 5 was flattened by 4% of the outer diameter of the tube, it was confirmed that it had the same water blocking capability as the above-described bending displacement and displacement in the tube axis direction.
本発明は、マンホールにリブ管を接続する継手構造において、止水性、屈曲性、伸縮性及び可撓性を有し、地震時の土圧の変動に対しても、所定の屈曲変位及び所定の管軸方向の変位を確保することができる可撓性継手のリブ付管用締付けリング構造としての利用が可能である。 The present invention provides a joint structure in which a rib tube is connected to a manhole, and has water-stopping properties, flexibility, stretchability, and flexibility. It can be used as a clamping ring structure for a ribbed tube of a flexible joint capable of ensuring displacement in the tube axis direction.
1…マンホール
2…削孔
3…可撓性継手
4…大径部
5…リブ付き管
6…小径部
7…切断部
8…リブ付締付けリング
8ａ…切断部
9…締付けバンド
10…リブ
12…斜形部
13…内周凹部
14…鍔
15…圧着リング
17…緩衝材
21、22…Ｖ字形溝
23…切込み溝
1 ... Manhole
2 ... Drilling
3 ... Flexible joint
4 ... Large diameter part
5 ... Ribbed tube
6 ... Small diameter part
7 ... Cutting part
8 ... Rive clamp ring
8a ... cutting part
9 ... Tightening band
10 ... Ribs
12 ... Slanted part
13… Inner recess
14 ... 鍔
15 ... Crimp ring
17 ... cushioning material
21, 22 ... V-shaped groove
23 ... Infeed groove
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004255274A JP4106694B2 (en) | 2004-09-02 | 2004-09-02 | Tightening ring structure for ribbed pipe of flexible joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004255274A JP4106694B2 (en) | 2004-09-02 | 2004-09-02 | Tightening ring structure for ribbed pipe of flexible joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2006070569A JP2006070569A (en) | 2006-03-16 |
| JP4106694B2 true JP4106694B2 (en) | 2008-06-25 |
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|---|---|---|---|---|
| JP5865637B2 (en) * | 2011-09-13 | 2016-02-17 | 株式会社Ｎｓワーク | Manhole bottom plate and assembly manhole |
| KR102120042B1 (en) * | 2013-10-30 | 2020-06-09 | 주태훈 | Connecting structure for corrugated pipe to cable pathway of manhole |
| KR101626278B1 (en) * | 2015-08-17 | 2016-06-01 | 주식회사 퍼팩트 | protective case for a sluice valve of easy gradient adjustment |
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