JP4970104B2

JP4970104B2 - Piping coating method

Info

Publication number: JP4970104B2
Application number: JP2007082314A
Authority: JP
Inventors: 貴史中島; 哲治根本
Original assignee: A&A Material Corp
Current assignee: A&A Material Corp
Priority date: 2007-03-27
Filing date: 2007-03-27
Publication date: 2012-07-04
Anticipated expiration: 2027-03-27
Also published as: JP2008240899A

Description

本発明は、エルボ部を有する配管を被覆する方法に関し、特に、作業員が近寄り難い狭所に位置する配管部分を作業スペースのある遠隔位置から被覆する配管被覆方法に関するものである。 The present invention relates to a method of coating a pipe having an elbow section, particularly, to a pipe coating process for coating a pipe portion located at the narrow difficult to approach the worker from a remote location with a working space.

従来、各種のプラント設備や発電所等において、内部に液体や気体等の各種の流体が流れる配管は、その配管内を流れる液体の温度を保温すると共に、その配管の周囲環境に与える温度の影響を小さくするために、保温材（断熱材）により被覆されている。特に、原子力発電プラントにあっては、使用期間中の検査の実施やメインテナンスの関係でこの配管を被覆する保温材を剥がす必要があるため、配管には近年開発された着脱自在な配管用保温材が取り付けられている。 Conventionally, pipes in which various fluids such as liquids and gases flow in various plant facilities and power plants keep the temperature of the liquid flowing in the pipes and the influence of the temperature on the surrounding environment of the pipes In order to reduce the size, the substrate is covered with a heat insulating material (heat insulating material). In particular, nuclear In the power plant, it is necessary to peel off the insulation material covering the pipe in relation to the inspection implementation and maintenance of the busy period, thermal insulation material for a removable pipe which was developed in recent years to the pipe Is attached.

例えば、本出願人の先の出願である特許文献１には、二つ以上の弧状の構成体からなり、組み合わせると配管の周囲で筒状となる断熱カバーが開示され、複数の構成体をバックルによって結合し、必要に応じて配管に自由に着脱できるように構成されている。しかしながら、この特許文献１に開示された断熱カバーは、配管の直管部に取り付けられるものである。 For example, in Patent Document 1 is the applicant's earlier application, two or more consists arcuate structure, combined with the heat-insulating cover made cylindrical around the pipe is disclosed, buckle the plurality of structure It is comprised so that it can couple | bond together and can be freely attached or detached to piping as needed. However , the heat insulating cover disclosed in Patent Document 1 is attached to a straight pipe portion of piping.

配管には、上述した直管部の他に、ほぼ９０°に湾曲したエルボ部を有するものがあり、このようなエルボ部へ着脱自在に取り付けられる保温材としては、エルボ部へその湾曲方向の左右両側から二分割された半割り体を装着し、バックルによって結合するものが知られている（例えば、特許文献２参照）。そして、このようにエルボ部を被覆した保温材と配管の直管部を被覆した保温材とをバックルによって結合するように構成されている。 The pipe, in addition to the straight tube portion as described above, there are those having an elbow portion curved substantially 90 °, as the heat insulating material detachably attached to such elbow, in the bending direction of the elbow portion navel It is known that a halved body divided into two from the left and right sides is attached and joined by a buckle (for example, see Patent Document 2). And it is configured in this way heat insulating material coating the elbow portion and a heat insulating material coated with straight pipe portions of the pipe in so that to bond the buckle.

特開２００４−１１６９４号公報JP 2004-11694 A 特開２００３−２８７１９２号公報JP 2003-287192 A

しかしながら、例えば、原子炉圧力容器の下部に配設された原子炉圧力容器用ベント管（以下、「ＲＰＶベント管」と称する）は、その天側が原子炉圧力容器の金属保温材（以下、「ＲＰＶ金属保温」と称する）に、その左右側が制御棒駆動機構（ＣＲＤ）に、そして、その下側がサポートビームに囲まれ、作業員が接近して作業することが不可能な狭所に位置し、上述したような半割り体をバックルで結合する作業を要する場合には、作業スペースがないために、その部分の配管を保温材で被覆することができないという問題点があった。配管が直管部のみの場合には、作業スペースのある場所で配管の周囲に保温材を装着し、装着した保温材を直管の配管に沿って長さ方向に送り込むことも可能であったが、エルボ部を被覆する湾曲した保温材を送り込むことは不可能であった。 However, for example, lower the disposed a reactor pressure vessel vent pipe of the reactor pressure vessel (hereinafter, referred to as "RPV vent tube") has its top side reactor pressure vessel of the metal heat insulator (hereinafter, to be referred to as "RPV metal insulation"), on the left and right side the control rod drive mechanism (CRD), and is surrounded by the lower support beam, it is not possible to worker to work close Semasho In the case where it is necessary to perform the operation of connecting the halves with the buckle as described above, there is no work space, so that there is a problem that the pipe of that portion cannot be covered with the heat insulating material. If the pipe is a straight pipe section Mino, a heat insulating material is mounted around the pipe at the location of the working space, also der to feed the heat insulating material mounted in the longitudinal direction along the pipe straight tube Tsu and although it was not possible to feed the curved heat insulating material covering the elbow portion.

また、このＲＰＶベント管に関しては、配管が高温となるため、どうしても断熱する必要があり、現状では、例えば、ロックウールを芯材としその外周をガラスクロス等の外被材で被覆してなる布団状の保温材で覆うような断熱保温方法が一般的に採用されている。したがって、装着のための作業スペースのある場所から配管のエルボ部が存在する場所まで、約２．５ｍ先まで保温材を送り込んで施工することとなり、エルボ部を被覆する保温材が送り込みの途中で変形し、断熱性能を保つことができないものと予想されている。特に、ＲＰＶ金属保温材との取り合い部において布団状の保温材を施工するために、エルボ部を越えて保温材を送り込む場合には、さらなる変形が見込まれ、この取り合い部における断熱性能を保つことはできないものと予想されている。 With regard to the RPV vent pipe, piping hot and such because, there is absolutely necessary to insulate, at present, for example, formed by the outer periphery to the rock wool core material covered with enveloping member such as glass cloth Heat insulation method as covered in the futon-like insulation material is for generally adopted. Therefore, the location of the work space for mounting to where the elbow portion of the pipe is present, next to it to construction by feeding insulation material to about 2.5m away, write feed thermal insulation material covering the elbow portion Mino deformed halfway, Ru Tei is expected to not be able to maintain the heat insulating performance. In particular, in order to applying a futon-like heat insulating material have you to scramble portion of the RPV metal heat insulator, when feeding the heat insulating material beyond the elbow, the additional deformation is expected, Keru apply in this scramble unit adiabatic to keep the performance of Ru is expected to not be Tei.

さらに、ドライウェル内においては、緊急（非常用）炉心冷却装置（ＥＣＣＳ）用配管特有の問題があり、繊維質保温材料が使えないため、保温材の施工が難しい状況にある。また、ＲＰＶベント管の周囲は、精密機器がある落下防止区域であり、粉塵等の飛散は好ましくない。 In addition, you Itewa in the dry well, emergency there is a (emergency) core cooling system (ECCS) piping of the specific problem, because it does not use the fibrous insulation materials, is in the construction is difficult situation of a heat insulating material. Moreover, the periphery of the RPV vent pipe is a fall prevention area with precision equipment , and scattering of dust and the like is not preferable.

従って、本発明は、このような従来の問題を解決するためになされたもので、作業員が近寄り難い狭所に位置するエルボ部を有する配管を作業スペースのある遠隔位置から容易に被覆する方法を提供することを主な目的とするものである。 Accordingly, the present invention has been made to solve such a conventional problem, and is a method for easily covering a pipe having an elbow portion located in a narrow place where an operator cannot easily approach from a remote position with a work space. The main purpose is to provide

また、本発明の他の目的は、繊維質保温材料の使用問題をクリアーし、粉塵が飛散し、落下しないクリーンな保温材により原子炉圧力容器用ベント管のエルボ部を作業スペースのある遠隔位置から着脱自在に被覆する方法を提供することである。 Another object of the present invention is to clear the use problems fibrous insulation material, dust scattered, remote location with a working space an elbow portion of the reactor pressure vessel vent pipe by a clean heat insulating material which does not fall It is providing the method of coat | covering detachably from .

このような目的を達成するため、請求項１に係る本発明の配管被覆方法は、配管のエルボ部の湾曲方向の前後方向に二分割され、結合してこのエルボ部の周囲を取り囲むように構成された第１エルボ部用保温材と第２エルボ部用保温材からなるエルボ部用保温材及び複数個の直管部用保温材を準備する段階と、作業スペースのある場所で、第１エルボ部用保温材を配管の直管部に配置し、この第１エルボ部用保温材に隣接してこの直管部に直管部用保温材を装着して連結し、さらに、この直管部用保温材に隣接して直管部用保温材を装着して連結し、同様にして、適当数の直管部用保温材を順次装着して連結することにより、第１エルボ部用保温材を直管部に沿ってエルボ部の一側へ送り込む段階と、前記第２エルボ部用保温材を前記エルボ部の他側に送り込む段階と、前記エルボ部の周囲を取り囲むように前記第１エルボ部用保温材と前記第２エルボ部用保温材とを結合する段階と、を備えることを特徴とする。 In order to achieve such an object, the pipe covering method of the present invention according to claim 1 is configured to be divided into two in the front-rear direction of the bending direction of the elbow part of the pipe and joined to surround the elbow part. preparing a first elbow portion for thermal insulation and the elbow section for thermal insulation and a plurality of straight tube portions for insulation material made of the second elbow portion for a heat insulating material which is, in the location of the work space, the first elbow The heat insulating material for the head portion is arranged in the straight pipe portion of the pipe, and the heat insulating material for the straight pipe portion is mounted and connected to the straight pipe portion adjacent to the heat insulating material for the first elbow portion. A heat insulating material for the first elbow part is attached by connecting and connecting the heat insulating material for the straight pipe part adjacent to the heat insulating material for the first elbow part in the same manner. a step of introducing into one side of the elbow portion along the straight pipe portion, the elbow of the second elbow portion for thermal insulation To the the step of introducing the other side, characterized in that it comprises the steps of coupling the first elbow portion for a heat insulating material and said second elbow portion for thermal insulation material so as to surround the periphery of the elbow portion.

ここで、「配管のエルボ部の湾曲方向の前後方向に二分割する」とは、ほぼ９０°に湾曲したエルボ部において、湾曲の曲率半径の小さい内側と、曲率半径の大きい外側とに二分割することをいい、エルボ部の左右両側方向に対称に二分割し、あるいは、湾曲したエルボ部の軸線に沿って扇型に二分割するものではない。また、「エルボ部の一側」とは、エルボ部において湾曲の曲率半径の小さい内側をいい、「エルボ部の他側」とは、湾曲の曲率半径の大きい外側をいう。 Here, “dividing into two in the longitudinal direction of the bending direction of the elbow part of the pipe” means that the elbow part is bent approximately 90 ° into two parts, that is, an inner side having a small curvature radius and an outer side having a large curvature radius. In other words, it is not divided into two symmetrically in the left and right direction of the elbow part, or divided into two fan-shaped parts along the axis of the curved elbow part. Further, “one side of the elbow part” refers to the inside of the elbow part having a small curvature radius, and “the other side of the elbow part” refers to the outside of the curvature radius of the curve.

なお、第１エルボ部用保温材に隣接する直管部用保温材には、その開放端部下端にガイド部材を配設し、第２エルボ部用保温材をエルボ部の他側に送り込む段階において、第２エルボ部用保温材の位置を調整することが好ましい。 In addition , the straight pipe part heat insulating material adjacent to the first elbow part heat insulating material is provided with a guide member at the lower end of the open end, and the second elbow part heat insulating material is fed to the other side of the elbow part. In the above, it is preferable to adjust the position of the second heat insulating material for the elbow part.

また、第２エルボ部用保温材をエルボ部の他側に送り込む段階においては、第２エルボ部用保温材を載置して搬送するための保温材搬送手段を準備し、第２エルボ部用保温材を第１エルボ部用保温材に当接するまで送り込むことができるのが好ましい。ここで、この保温材搬送手段を、エルボ部の他側にまで延設されている支持部材上で移動させることが好ましい。さらに、保温材搬送手段には位置調整手段を配設し、第１エルボ部用保温材に対して第２エルボ部用保温材の高さ位置を調整することが望ましい。 Further, Oite the step of introducing a second elbow portion for a heat insulating material on the other side of the elbow section prepares a heat insulating material conveying means for conveying and placing the second elbow portion for thermal insulation material, the second elbow It is preferable that the heat insulating material for the part can be fed until it comes into contact with the heat insulating material for the first elbow part. Here, the heat insulating material conveying means, and thereby it is preferably moved on a support member which extends to the other side of the elbow portion. Further , it is desirable that a position adjusting means is provided in the heat insulating material conveying means to adjust the height position of the second elbow heat insulating material with respect to the first elbow heat insulating material.

さらに、第１エルボ部用保温材と第２エルボ部用保温材とは着脱自在の結合手段により結合することが好ましい。例えば、第１エルボ部用保温材にはボルトを埋設し、第２エルボ部用保温材には、前記ボルトに対応する位置にボルト貫通穴を穿設し、第１エルボ部用保温材と第２エルボ部用保温材とを結合する段階において、第１エルボ部用保温材のボルトを第２エルボ部用保温材の対応するボルト貫通穴に挿通させた後、裏側から取り付け用冶具を用いてナット締め付けして結合することが好ましい。 Furthermore, it is preferable to couple | bond the 1st elbow part heat insulating material and the 2nd elbow part heat insulating material by the detachable coupling | bonding means . For example, the first elbow portion for a heat insulating material buried bolt, the second elbow portion for heat insulating material, bored bolt through holes at positions corresponding to the bolt, first a first elbow portion for thermal insulation in the step of coupling the for two elbow insulation material, after the bolt of the first elbow portion for thermal insulation is inserted into the corresponding bolt through-hole of the second elbow portion for thermal insulation, by using a mounting jig from the back It is preferable that the nuts be joined by tightening .

配管が原子炉圧力容器の下部に配設された原子炉圧力容器用ベント管であって、エルボ部用保温材を金属保温材とすることができる。 Pipe A vent pipe lower portion disposed a reactor pressure vessel of a nuclear reactor pressure vessel, an elbow portion for heat insulating material may be a metal heat insulators.

配管のエルボ部の湾曲方向の前後方向に二分割された第１及び第２エルボ部用保温材の第１エルボ部用保温材を、作業スペースのある場所で配管の直管部に配置し、この第１エルボ部用保温材に隣接して直管部用保温材を直管部に装着して連結し、さらに、この直管部用保温材に隣接して直管部用保温材を装着して連結し、同様にして、適当数の直管部用保温材を順次装着して連結することにより、第１エルボ部用保温材を直管部に沿ってエルボ部の一側に送り込み、他側に送り込まれた第２エルボ部用保温材とこのエルボ部の周囲を取り囲むように結合することにより、作業員が近寄り難い狭所にあっても、エルボ部を有する配管を保温材で被覆するものである。特に、原子炉圧力容器の下部に配設された原子炉圧力容器用ベント管を金属保温材からなるエルボ部用保温材で被覆することにより、繊維質保温材料を使用する際の問題がクリアーされ、粉塵が飛散、落下の無いクリーンな保温が可能となる。 The first elbow part heat insulating material of the first and second elbow part heat insulating material divided in the longitudinal direction of the bending direction of the elbow part of the pipe is disposed in the straight pipe part of the pipe at a place where there is a work space, A straight pipe part heat insulating material is attached to and connected to the straight pipe part adjacent to the first elbow part heat insulating material, and a straight pipe part heat insulating material is attached adjacent to the straight pipe part heat insulating material. In the same manner, by sequentially attaching and connecting an appropriate number of heat insulating materials for the straight pipe part, the first heat insulating material for the elbow part is sent to one side of the elbow part along the straight pipe part , by binding to surround the periphery of the elbow and the second elbow portion for a heat insulating material fed into the other side, even where the narrow difficult to approach worker, covering a pipe having an elbow section with a heat insulating material it is intended to. In particular, by the lower part disposed the reactor pressure vessel vent pipe of the reactor pressure vessel coated with elbow for thermal insulation material made of a metal heat insulating material, clear problems when using fibrous insulation materials is, dust is flying, clean thermal insulation is made possible without falling.

次に、本発明の好適な実施の形態を、添付図面を参照しながら説明する。図中、同一符号は、同一又は対応部分を示す。 Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings . In the drawings, the same reference numerals indicate the same or corresponding parts.

最初に、図１〜図４を参照しながら、本発明に係る配管被覆方法に使用するエルボ部用保温材を詳述する。図１は原子炉圧力容器の下部に配設された原子炉圧力容器用ベント管２（以下、「ＰＲＶベント管」と称する）のエルボ部２ａの周囲を取り囲むように配置されたエルボ部用保温材１０の結合前の状態を示す概略側面図であり、図２はエルボ部用保温材１０の結合状態を示す側面図、図３はエルボ部用保温材１０の一側の構成要素である第１エルボ部用保温材２０を示す側面図、正面図及び上面図、そして、図４は他側の構成要素である第２エルボ部用保温材４０を示す正面図、側面図及び上面図である。 First, the elbow part heat insulating material used in the pipe coating method according to the present invention will be described in detail with reference to FIGS. FIG. 1 shows a heat retention for an elbow part arranged so as to surround an elbow part 2a of a reactor pressure vessel vent pipe 2 (hereinafter referred to as "PRV vent pipe") disposed at the lower part of the reactor pressure vessel. 2 is a schematic side view showing a state before the material 10 is joined, FIG. 2 is a side view showing the joined state of the heat retaining material 10 for the elbow part, and FIG. 3 is a component on one side of the heat retaining material 10 for the elbow part. FIG. 4 is a front view, a side view, and a top view showing a second elbow part heat insulating material 40 that is a component on the other side. .

まず、図１を参照するに、ＰＲＶベント管２は、エルボ部２ａと、このエルボ部２ａに連設される水平直管部２ｂ及び鉛直直管部２ｃとで構成されており、鉛直直管部２ｃの周囲は、原子炉圧力容器の下側を保温するように配設された原子炉圧力容器用金属保温材４（以下、「ＲＰＶ用金属保温材」と称する）に覆われている。結合するとエルボ部２ａの周囲を取り囲むように構成されるエルボ部用保温材１０は、このエルボ部２ａの湾曲方向の前後方向に二分割されたものであり、すなわち、ほぼ９０°に湾曲したエルボ部において、湾曲の曲率半径の小さい内側に配置される第１エルボ部用保温材２０と、曲率半径の大きい外側に配置される第２エルボ部用保温材４０とからなっている。第１エルボ部用保温材２０の水平直管部２ｂ側には、水平直管部２ｂの周囲を被覆するための直管部用保温材６０が配設されている。直管部用保温材６０は複数個接続して水平直管部２ｂを被覆するものであるが、詳細は後述する。一方、第２エルボ部用保温材４０は、保温材搬送手段としての保温材搬送装置７０に載置されており、この保温材搬送装置７０によってエルボ部２ａの他側、すなわち、エルボ部２ａの湾曲の曲率半径の大きい外側に送り込まれるが、詳細は後述する。なお、参照符号９０は、第１エルボ部用保温材２０と第２エルボ部用保温材４０とを結合するために、ナット１００を操作するための取付冶具であるが、これも詳細は後述する。 Referring first to FIG. 1, PRV vent pipe 2, the elbow portion 2a, is composed of a horizontal straight tube portion 2b and the vertical straight portion 2c Ru is provided continuously to the elbow portion 2a, a vertical straight The periphery of the part 2c is covered with a reactor pressure vessel metal heat insulating material 4 (hereinafter referred to as "RPV metal heat insulating material") disposed so as to keep the temperature below the reactor pressure vessel. Upon binding elbow portion 2a elbow portion for heat insulator 10 configured so as to surround the periphery of the Der those bisected in the longitudinal direction of the bending direction of the elbow portion 2a is, i.e., curved approximately 90 ° in elbow, it has a first elbow portion for thermal insulation material 20, the second elbow portion for thermal insulation 40 that is disposed in a large outer radius of curvature which is arranged in a small inner radius of curvature of the curved. On the horizontal straight pipe portion 2b side of the first elbow portion heat insulating material 20, a straight pipe portion heat insulating material 60 for covering the periphery of the horizontal straight pipe portion 2b is disposed . Straight pipe section for thermal insulation 60 is one in which covers the horizontal straight tube portion 2b by connecting a plurality, details will be described later. On the other hand, the second heat insulating material 40 for the elbow part is placed on a heat insulating material transfer device 70 as a heat insulating material transfer means, and the other side of the elbow part 2a, that is, the elbow part 2a by the heat insulating material transfer device 70. Although it sends to the outer side where the curvature radius of curvature is large, details will be described later. Reference numeral 90 in order to bond the first elbow portion for a heat insulating material 20 and a second elbow section for thermal insulation 40, is a mounting jig for operating the nut 100, which is also described in detail later To do.

次に、エルボ部用保温材１０の構造を詳述する。配管２のエルボ部２ａの一側に配置される第１エルボ部用保温材２０は、半円筒状をした水平胴部２１と、同じく半円筒状をした鉛直胴部２２（図３参照）とを、ほぼ９０°の状態に組み合わせた形状をしている。第１エルボ部用保温材２０の内側には、鉛直胴部２２の開放端部２３から水平胴部２１の開放端部２４に亘って、ＲＰＶベント管２のエルボ部２ａの形状に整合する湾曲面が形成された第１空洞部２５が画成されている。鉛直胴部２２の第２エルボ部用保温材４０と対向する第１鉛直接合面２６には、第１空洞部２５を挟んだ両側の対称位置に、ボルト２７が２本、第１鉛直接合面２６から水平方向に突出するように埋め込まれている。これらのボルト２７は、第２エルボ部用保温材４０を取り付ける際の位置決めガイドとしても機能するが、その作用は後述する。なお、ボルト２７の数は、この実施例の２本に限定されるものではなく、１本でも、あるいは３本以上でもよい。また、水平胴部２１の下側の第１空洞部２５を挟む両側面は、第１水平接合面２８として機能する。 Next, the structure of the elbow part heat insulating material 10 will be described in detail. The first elbow part heat insulating material 20 disposed on one side of the elbow part 2a of the pipe 2 includes a semi-cylindrical horizontal body part 21 and a semi-cylindrical vertical body part 22 (see FIG. 3). Are combined in a state of approximately 90 °. On the inner side of the heat insulating material 20 for the first elbow part, a curve that matches the shape of the elbow part 2 a of the RPV vent pipe 2 extends from the open end part 23 of the vertical trunk part 22 to the open end part 24 of the horizontal trunk part 21. A first cavity 25 having a surface is defined. The first vertical joint surface 26 facing the second elbow part heat insulating material 40 of the vertical body 22 has two bolts 27 at the symmetrical positions on both sides of the first cavity 25 and the first vertical joint surface. 26 is embedded so as to protrude in the horizontal direction. These bolts 27 also function as positioning guides when the second elbow part heat insulating material 40 is attached, and the operation thereof will be described later. The number of bolts 27 is not limited to two in this embodiment, but may be one or three or more. Further, both side surfaces sandwiching the first cavity portion 25 below the horizontal body portion 21 function as the first horizontal joint surface 28.

エルボ部用保温材１０の他方の構成要素であり、エルボ部２ａの他側に配置される第２エルボ部用保温材４０（図４参照）は、半円筒状をした鉛直胴部４１と、直方体状をした水平胴部４２とを、ほぼ９０°の状態に組み合わせた形状をしている。第２エルボ部用保温材４０の内側には、鉛直胴部４１の開放端部４３から水平胴部４２の開放端部４４に亘って、ＲＰＶベント管２のエルボ部２ａを囲繞するような第２空洞部４５が画成されている。鉛直胴部４１の第１エルボ部用保温材２０と対向する第２鉛直接合面４６には、第２空洞部４５を挟んだ両側の対称位置で、且つ第１エルボ部用保温材２０のボルト２７に対応する位置に、ボルト用の貫通穴４８が２箇所、湾曲表面４７に向かって水平に穿設されており、さらに、これらの貫通穴４８に連通するように、図１に示すようなナット１００を保持する取付冶具９０を挿入し得る大きさの作業用穴４９が湾曲表面４７から穿設されている。なお、水平胴部４２の上側の第２空洞部４５を挟む両側面は、第２水平接合面５０として機能する。また、水平胴部４２の下側の載置面５１は、図１に示すように、保温材搬送装置７０に載置し易くするために平坦になっているが、保温材搬送装置７０の支持面７８と相補形状であれば、どのような形状であってもよい。 The second elbow part heat insulating material 40 (see FIG. 4), which is the other component of the elbow heat insulating material 10 and is disposed on the other side of the elbow part 2a, includes a semi-cylindrical vertical body 41, A rectangular body-like horizontal body portion 42 is combined in a substantially 90 ° state. Inside the second elbow part heat insulating material 40, the elbow part 2 a of the RPV vent pipe 2 is surrounded from the open end part 43 of the vertical trunk part 41 to the open end part 44 of the horizontal trunk part 42. Two cavities 45 are defined. On the second vertical joint surface 46 of the vertical body portion 41 facing the first elbow portion heat insulating material 20, the bolts of the first elbow portion heat insulating material 20 at symmetrical positions on both sides of the second cavity 45. As shown in FIG. 1, two through holes 48 for bolts are drilled horizontally toward the curved surface 47 at positions corresponding to 27, and are further communicated with these through holes 48. A working hole 49 is drilled from the curved surface 47 so that the mounting jig 90 for holding the nut 100 can be inserted. Note that both side surfaces sandwiching the second hollow portion 45 above the horizontal body portion 42 function as the second horizontal joint surface 50. Further, as shown in FIG. 1, the mounting surface 51 on the lower side of the horizontal body portion 42 is flat so as to be easily placed on the heat insulating material transfer device 70, but the support of the heat insulating material transfer device 70 is supported. Any shape can be used as long as it is complementary to the surface 78.

以上で説明した第１エルボ部用保温材２０と第２エルボ部用保温材４０とを、ボルト２７及びナット１００で着脱自在に結合させると、図２に示すようなエルボ部用保温材１０が形成され、その内部には、第１空洞部２５と第２空洞部４５とによりエルボ部２ａを取り囲む空洞部１２が画成される。この際、第１エルボ部用保温材２０の第１鉛直接合面２６と第１水平接合面２８とは、各々、第２エルボ部用保温材４０の第２鉛直接合面４６と第２水平接合面５０と接合し、空洞部１２を密閉することができる。この実施例では、エルボ部用保温材１は、金属保温材である。それは、ＲＰＶベント管２の位置するドライウェル内においては、繊維質保温材の使用により粉塵を発生させることができず、クリーンな保温をする必要があり、そのために全て金属製の金属保温材を用いるものである。 When the first elbow part heat insulating material 20 and the second elbow part heat insulating material 40 described above are detachably coupled with bolts 27 and nuts 100, the elbow part heat insulating material 10 as shown in FIG. It is formed, on its inside, the cavity 12 surrounding the elbow portion 2a is defined by a first cavity 25 and second cavity 45. At this time, the first vertical joint surface 26 and the first horizontal joint surface 28 of the first elbow part heat insulating material 20 are respectively the second vertical joint surface 46 and the second horizontal joint surface of the second elbow part heat insulating material 40. Joining to the surface 50, the cavity 12 can be sealed. In this embodiment, the elbow part heat insulating material 1 is a metal heat insulating material. In the dry well where the RPV vent pipe 2 is located, dust cannot be generated due to the use of the fiber heat insulating material , and it is necessary to maintain a clean heat. For this reason, all metal metal heat insulating materials are used. one in which Ru used.

再び、図１を参照するに、第１エルボ部用保温材２０の開放端部２４側には、水平直管部２ｂの周囲を保温するために被覆する直管部用保温材６０が配設されている。この直管部用保温材６０は、どのようなものでも良いが、先に背景技術で説明した本出願人の先の出願である特許文献１に開示されたような、二つ以上の弧状の構成体からなり、組み合わせると配管の周囲で筒状となる断熱カバーに金属保温材を使用して、バックルなどで着脱自在に結合されるものが好ましい。第１エルボ部用保温材２０に隣接して装着される直管部用保温材６０には、適当数のオス型バックル６１が取り付けられており、これに対応する第１エルボ部用保温材２０の水平胴部２１には、メス型バックル２９が適当数取り付けられている。したがって、これらのバックルを連結することにより、第１エルボ用保温材２０と直管部用保温材６０とを連結することができる。直管部用保温材６０は、図９に示すように、配管の直管部を被覆するために必要な数だけ複数個用意されるが、原子炉圧力容器の下側の場合、作業員が作業することができる作業スペースのある場所からエルボ部２ａの一側まで第１エルボ部用保温材２０を送り込むために必要な距離は、約３ｍぐらいである。従って、適当数の直管部用保温材６０ａ〜６０ｄ・・・を配管の直管部に順次装着し、且つ順次図示しないバックル等の連結手段を用いて長手方向に連結しながら、第１エルボ部用保温材２０をエルボ部２ａの一側まで配管に沿って送り込むことができる。このように、直管部用保温材６０を複数個連結しながら送り込むことにより、第１エルボ部用保温材２０を単独で押し込む手間が省け、作業時間を短縮することができる。また、バックル等で結合して連結することにより、配管上に配置した第１エルボ部用保温材２０が回転することがなく、エルボ部２ａに対する位置合わせを行うことができるので、その一側に正確に送り込むことができる。 Again, referring to FIG. 1, the open end 24 side of the first elbow portion for thermal insulation material 20, disposed is a straight pipe section for thermal insulation 60 covering to insulation around the horizontal straight tube portion 2b Has been. The straight pipe section for thermal insulation member 60, What is also good Iga, previously as disclosed in Patent Document 1 is the applicant's earlier application described in the background art, two or more arcuate consists of structure, combined with the use of metal heat insulator in the heat insulating cover comprising a cylindrical around the pipe, also it is preferable is detachably coupled such buckle. An appropriate number of male buckles 61 are attached to the straight pipe heat insulating material 60 mounted adjacent to the first elbow heat insulating material 20, and the first elbow heat insulating material 20 corresponding thereto is attached. An appropriate number of female buckles 29 are attached to the horizontal barrel 21. Therefore , by connecting these buckles, the first elbow heat insulating material 20 and the straight pipe heat insulating material 60 can be connected. As shown in FIG. 9, a plurality of the heat insulation materials 60 for the straight pipe part are prepared as many as necessary to cover the straight pipe part of the piping. The distance required to feed the first elbow part heat insulating material 20 from a place where there is a work space where work can be performed to one side of the elbow part 2a is about 3 m. Therefore, sequentially mounting the straight tube portion for thermal insulation 60 a to 60 d · · · of the appropriate number of straight pipe portion of the pipe, while connected to the machine direction using a connecting means of the buckle or the like and not sequentially shown, first elbow The thermal insulation material 20 for a part can be sent along piping to one side of the elbow part 2a. In this way, by feeding a plurality of straight pipe part heat insulating materials 60 while connecting them, it is possible to save the trouble of pushing the first elbow part heat insulating material 20 alone and to shorten the working time. In addition, by connecting and connecting with a buckle or the like, the first elbow part heat insulating material 20 arranged on the pipe does not rotate and can be aligned with the elbow part 2a. Can be sent accurately.

また、第１エルボ部用保温材２０に隣接して装着される直管部用保温材６０の第１エルボ部用保温材側の開放端部６２には、その下端に板状のガイド部材６３が取り付けられている。ガイド部材６３は、図から明らかなように、開放端部６２から前方且つ下方に向かって傾斜するように突設されており、第２エルボ部用保温材４０を第１エルボ部用保温材２０に挿入する際に、第２エルボ部用保温材４０の水平胴部４２の開放端部４４の下端を案内することにより、両者の位置決めを行えるようにするものである。また、第１エルボ部用保温材２０の第１鉛直接合面２６から突出したボルト２７も、第２エルボ部用保温材４０の貫通穴４８を挿入する際、両者の位置決めを行えるようにするものであり、ボルト２７とガイド部材６３とを併用することにより、容易に正確な位置合わせを行うことができる。 Further, the open end portion 62 on the first elbow portion heat insulating material side of the straight tube portion heat insulating material 60 mounted adjacent to the first elbow portion heat insulating material 20 has a plate-like guide member 63 at the lower end thereof. Is attached. As is apparent from the drawing, the guide member 63 protrudes from the open end 62 so as to incline forward and downward, and the second elbow part heat insulating material 40 is connected to the first elbow part heat insulating material 20. At the time of insertion, the lower end of the open end portion 44 of the horizontal body portion 42 of the second elbow portion heat insulating material 40 is guided so that both can be positioned. Further, the bolt 27 protruding from the first vertical joint surface 26 of the first elbow part heat insulating material 20 can also be positioned when the through hole 48 of the second elbow part heat insulating material 40 is inserted. Thus, by using the bolt 27 and the guide member 63 in combination, accurate alignment can be easily performed.

次に、図１、図６及び図７を参照しながら、第２エルボ部用保温材４０を搬送する保温材搬送装置７０を説明する。保温材搬送装置７０は、第２エルボ部用保温材４０を載置する底板７２及び背板７３とからなる本体部７１と、本体部７１の下側に取り付けられた二個の可動輪７４と、本体部７１の背板７３に回動可能に取り付けられた搬送用連結棒７５とを備えており、搬送用連結棒７５の長手方向に沿って本体部７１を移動させることができるように構成されている。搬送用連結棒７５の長さとしては、作業員が作業することができる作業スペースからエルボ部２ａの他側まで第２エルボ部用保温材４０を送り込むために必要な長さと同程度かあるいはそれ以上の長さが必要であり、本実施形態においては、約３ｍぐらいである。搬送用連結棒７５の開放端側には、手で掴み易いようにするための把持部７６が設けられている。本体部７１の底板上には、位置調整手段としてのレベル調整装置７７が取り付けられ、第２エルボ部用保温材４０を第１エルボ部用保温材に取り付ける際の高さ位置を微調整できるようになっている。レベル調整装置７７としては、遠隔操作できるような構成であればどのようなものでも良く、例えば、把持部７６を回動させることにより歯車機構が作動して上下動するような構成でもよい。なお、本体部７１の形状は、第２エルボ部用保温材４０をエルボ部まで搬送し、その後は回収することができればよいのであるから、移動方向の前方及び上方が開放された形状がよく、左右方向に第２エルボ部用保温材４０がズレないようにするために二枚の側板を設けることが好ましい。また、可動輪７４は、本実施形態においては、二個であるが、本発明にこれに限定されるものではなく、一個でも、あるいは三個以上でもよい。 Next, with reference to FIGS. 1, 6, and 7, a heat insulating material transporting device 70 that transports the second elbow portion heat insulating material 40 will be described. The heat insulating material transfer device 70 includes a main body 71 composed of a bottom plate 72 and a back plate 73 on which the second elbow heat insulating material 40 is placed, and two movable wheels 74 attached to the lower side of the main body 71. , And a transfer connecting rod 75 rotatably attached to the back plate 73 of the main body 71, and the main body 71 can be moved along the longitudinal direction of the transfer connecting rod 75. Has been. The length of the transport connecting rod 75 is approximately the same as that required for feeding the second heat retaining material 40 from the work space where the worker can work to the other side of the elbow part 2a , or the length thereof. The above length is necessary, and in this embodiment, it is about 3 m. On the open end side of the conveying connecting rod 75, a gripping portion 76 is provided to facilitate gripping by hand. On the bottom plate of the main body portion 71, a level adjusting device 77 as a position adjusting means is attached so that the height position when the second elbow heat insulating material 40 is attached to the first elbow heat insulating material can be finely adjusted. It has become. The level adjusting device 77 may be of any configuration as long as it can be remotely operated. For example, the level adjusting device 77 may be configured such that the gear mechanism is moved up and down by rotating the grip portion 76. The shape of the main body portion 71, a second elbow portion for a heat insulating material 40 is conveyed to the elbow portion, then since it is the only has to be recovered may form the front and top are open in the direction of movement, In order to prevent the second elbow part heat insulating material 40 from shifting in the left-right direction, it is preferable to provide two side plates. Further, although there are two movable wheels 74 in the present embodiment, the present invention is not limited to this, and may be one or three or more.

原子炉圧力容器のＲＰＶベント管２の下側には、必ずＣＲＤハウジング用のサポートビーム６が配設されている。すなわち、このサポートビーム６は、エルボ部２ａの他側にまで延設されている支持部材であり、上述した保温材搬送装置７０は、サポートビーム６の上をその長手方向に移動させることによって、第２エルボ部用保温材４０をエルボ部２ａの他側にまで送り込むように構成するのが好ましい。 A support beam 6 for the CRD housing is always disposed below the RPV vent pipe 2 of the reactor pressure vessel. That is, the support beam 6 is a support member that extends to the other side of the elbow portion 2a, the heat insulating material transporting device 70 described above, by Rukoto move over the support beams 6 in the longitudinal direction preferably, forming the second elbow portion for thermal insulation material 40 as feed write No to the other side of the elbow portion 2a.

次に、図１及び図８を参照しながら、第１エルボ部用保温材２０と第２エルボ部用保温材４０とをボルト・ナットで結合するために、ナットを操作するための取付冶具９０を説明する。取付冶具９０は、軸方向に細長い本体部９１と、本体部９１の一端に取り付けられた操作用の把持部９２と、本体部９１の他端側に取り付けられたナット保持部９３とを備えている。取付冶具９０の本体部９１は、作業員が作業できる作業スペースのある場所からエルボ部２ａの位置までの長さと同程度かあるいはそれ以上の長さが必要で、本実施形態においては、搬送用連結棒７５と同じように、約３ｍぐらいである。このように構成された取付冶具９０のナット保持部９３にナット１００を装着し、このナット１００を第２エルボ部用保温材４０の作業用穴４９に挿入して後、把持部９２を回転させることにより、第１エルボ部用保温材２０のボルト２７に対しナット１００を締め付けることができる。 Next, with reference to FIGS. 1 and 8, in order to bind to the first elbow portion for a heat insulating material 20 and a second elbow section for thermal insulation 40 with bolts and nuts, the mounting jig for operating the nut 90 will be described. The mounting jig 90 includes a main body 91 that is elongated in the axial direction, a grip 92 for operation attached to one end of the main body 91, and a nut holding portion 93 attached to the other end of the main body 91. Yes. The main body 91 of the mounting jig 90 needs to have a length approximately equal to or longer than the length from the place where there is a work space where the worker can work to the position of the elbow part 2a. Like the connecting rod 75, it is about 3m. The nut 100 is attached to the nut holding portion 93 of the mounting jig 90 configured as described above, and the nut 100 is inserted into the work hole 49 of the second elbow portion heat insulating material 40 and then the grip portion 92 is rotated. it is thus possible to apply tightening the nuts 100 against the bolt 27 of the first elbow portion for thermal insulation 20.

以上のように構成された各部材を用いて原子炉圧力容器の下部に配設されたＲＰＶベント管２のエルボ部２ａを有する配管を遠隔位置から被覆する作業手順を、図９〜図１１を参照しながら説明する。最初に、作業スペースのある場所で、第１エルボ部用保温材２０を水平直管部２ｂの上側に配置し、この第１エルボ部用保温材２０に隣接して直管部用保温材６０ａを水平直管部２ｂに装着して連結し、さらに、この直管部用保温材６０ａに隣接して直管部用保温材６０ｂを水平直管部２ｂに装着して連結し、その後、順次同様にして、直管部用保温材６０ｃ、６０ｄを装着して連結し、図９に示すように、第１エルボ部用保温材２０をエルボ部２ａの湾曲の曲率半径の小さい内側にまで送り込む。この時、各保温材は図１に示すバックルで連結して送り込まれるので、第１エルボ部用保温材２０が水平直管部２ｂの上で回転することがなく、エルボ部２ａに対する位置合わせを正確に行うことができる。 The operation procedure for covering the pipe having the elbow portion 2a of the RPV vent pipe 2 disposed in the lower part of the reactor pressure vessel from the remote position using the respective members configured as described above is shown in FIGS. The description will be given with reference. First, in a place where there is a work space, the first elbow part heat insulating material 20 is disposed on the upper side of the horizontal straight pipe part 2b , and the straight pipe part heat insulating material 60a is adjacent to the first elbow part heat insulating material 20. Is attached to and connected to the horizontal straight pipe portion 2b, and the straight pipe portion heat insulating material 60b is attached to and connected to the horizontal straight pipe portion 2b adjacent to the straight pipe portion heat insulating material 60a. Similarly, the straight pipe heat insulating materials 60c and 60d are mounted and connected, and as shown in FIG. 9, the first elbow heat insulating material 20 is fed into the inside of the elbow portion 2a where the curvature radius of curvature is small. . At this time, since each heat insulator sends linked buckle shown in FIG. 1 write Murrell, without first elbow portion for heat insulating material 20 is rotated on a horizontal straight tube portion 2b, the position relative to the elbow portion 2a suit can be carried out accurately.

次に、図１０に示すように、ＲＰＶベント管２の下側に配設されたサポートビーム６の上に、第２エルボ部用保温材４０を載せた保温材搬送装置７０を載置し、把持部７６を手で掴んで第２エルボ部用保温材４０をエルボ部２ａの湾曲の曲率半径の大きい外側にまで送り込む。 Next, as shown in FIG. 10, on the support beam 6 disposed on the lower side of the RPV vent pipe 2, a heat insulating material transfer device 70 on which the heat insulating material 40 for the second elbow part is placed is placed. The holding part 76 is grasped by hand, and the second heat insulating material 40 for the elbow part is fed to the outside where the curvature radius of the elbow part 2a is large.

そして、図１１に示すように、ＲＰＶベント管２のエルボ部２ａの周囲を取り囲むように、第１エルボ部用保温材２０と第２エルボ部用保温材４０を突き合わせる。この時、第２エルボ部用保温材４０に向かって突出している第１エルボ部用保温材２０のボルト２７と直管部用保温材６０の下側に取り付けられたガイド部材６３とが位置決め部材として機能すると共に、保温材搬送装置７０のレベル調整装置７７により高さ方向の微調整を行うことができるため、第２エルボ部用保温材４０を正確に第１エルボ部用保温材２０に突き合わせることができる。この状態において、取付冶具９０に保持したナット１００を第２エルボ部用保温材４０の作業用穴４９に挿入し、貫通穴４８から突出しているボルト２７に締め付けて固定することにより、第１エルボ部用保温材２０と第２エルボ部用保温材４０とが着脱自在に密着結合され、エルボ部２ａを含む配管を金属保温材であるエルボ部用保温材で被覆することができる。なお、結合後は、取付冶具９０及び保温材搬送装置７０を引き抜き回収すれば、被覆作業は終了する。 And as shown in FIG. 11, the 1st elbow part heat insulating material 20 and the 2nd elbow part heat insulating material 40 are faced | matched so that the circumference | surroundings of the elbow part 2a of the RPV vent pipe 2 may be surrounded. At this time, the bolt 27 of the first elbow part heat insulating material 20 protruding toward the second elbow part heat insulating material 40 and the guide member 63 attached to the lower side of the straight pipe heat insulating material 60 are positioning members. And the fine adjustment in the height direction can be performed by the level adjusting device 77 of the heat insulating material conveying device 70, so that the second elbow heat insulating material 40 is accurately matched to the first elbow heat insulating material 20. Can be. In this state, the nut 100 held by the mounting jig 90 is inserted into the work hole 49 of the second elbow part heat insulating material 40, and is fastened and fixed to the bolt 27 protruding from the through hole 48. The elbow part heat insulating material 20 and the second elbow part heat insulating material 40 are detachably tightly coupled, and the pipe including the elbow part 2a can be covered with the elbow part heat insulating material which is a metal heat insulating material. After the coupling, if the attachment jig 90 and the heat insulating material transfer device 70 are pulled out and collected , the covering operation is completed.

点検等で被覆した保温材を取り除く場合には、上述した手順を逆に行えばよく、第２エルボ部用保温材４０の下に保温材搬送装置７０を移動させ、その後、取付冶具９０を用いてナット１００を取り外し、第２エルボ部用保温材４０を第１エルボ部用保温材２０から引き離して原子炉圧力容器の下側の狭所から引き出すと共に、作業スペースのある場所で、直管部用保温材６０ｄと直管部用保温材６０ｃとの連結を外し、直管部用保温材６０ｄを水平直管部２ｂから取り外し、次いで、同様に残りの直管部用保温材を引き出し、直管部用保温材６０ｃと直管部用保温材６０ｂとの連結を外し、直管部用保温材６０ｃを水平直管部２ｂから取り外すようにして、順次直管部用保温材を直管水平部２ｂから取り外して行けば、最後には、第１エルボ部用保温材２０を作業スペースのある場所まで引き出して、配管から取り外すことができる。 When removing the heat insulating material covered by inspection or the like, the above-described procedure may be reversed. The heat insulating material transporting device 70 is moved below the heat insulating material 40 for the second elbow part, and then the attachment jig 90 is used. The nut 100 is removed, and the second elbow part heat insulating material 40 is pulled away from the first elbow part heat insulating material 20 and pulled out from the narrow space below the reactor pressure vessel. Remove the connection between the heat insulating material 60d for the straight pipe and the heat insulating material 60c for the straight pipe section, remove the heat insulating material 60d for the straight pipe section from the horizontal straight pipe section 2b , and then pull out the remaining heat insulating material for the straight pipe section in the same manner. Remove the connection between the heat insulating material 60c for the pipe section and the heat insulating material 60b for the straight pipe section, and remove the heat insulating material 60c for the straight pipe section from the horizontal straight pipe section 2b. if you remove it from the part 2b, in the end, the first El The Department for the heat insulating material 20 and pull out to the location of the work space, can be removed from the pipe.

以上の実施形態において、第１エルボ部用保温材２０と第２エルボ部用保温材４０とを着脱自在に結合する方法として、第１エルボ部用保温材２０にボルト２７を埋設し、第２エルボ部用保温材４０の背面側からナット１００で締着するように構成したが、図５Ａに示すように、第１エルボ部用保温材２０’側にねじ切をして、第２エルボ部用保温材４０’の背面側からボルト１０２で着脱自在に結合することもできる。 In the above embodiment, as a method of detachably coupling the first elbow part heat insulating material 20 and the second elbow part heat insulating material 40, the bolt 27 is embedded in the first elbow part heat insulating material 20, and the second Although it comprised so that it might fasten with the nut 100 from the back side of the heat insulating material 40 for elbow parts, as shown to FIG. 5A, it thread-cuts to the heat insulating material 20 'side for 1st elbow parts, and is for 2nd elbow parts It can also detachably couple | bond with the volt | bolt 102 from the back side of heat insulating material 40 '.

また、図５Ｂに示すように、第１エルボ部用保温材２０’’の鉛直胴部から両外向きにフランジ１０４を突設すると共にボルト１０６を止着し、第２エルボ部用保温材４０’’の鉛直胴部から両外向きにフランジ１０８を突設させて、背面側からナット１１０で締着するようにしてもよい。フランジが出っ張る分、幅をとるが、第２エルボ部用保温材４０’’の鉛直胴部に穴を穿設することがないので、保温性がよくなる。 Further, as shown in FIG. 5B, the flange 104 is projected outward from the vertical body portion of the first elbow portion heat insulating material 20 ″, and the bolts 106 are fastened to fix the second elbow portion heat insulating material 40. The flange 108 may protrude outwardly from the vertical body portion of '' and may be fastened with the nut 110 from the back side. Although the width is increased by the protrusion of the flange, since no hole is drilled in the vertical body portion of the second elbow portion heat insulating material 40 ″, the heat retaining property is improved.

さらに、図５Ｃに示すように、第１エルボ部用保温材２０’’’と第２エルボ部用保温材４０’’’とをバックル１１２によって着脱自在に結合することもできる。この場合には、取付冶具９０のナット保持部９３の形状を、遠隔操作でバックルを止められるような形状に変更すればよい。 Further, as shown in FIG. 5C, the first elbow part heat insulating material 20 ″ ″ and the second elbow part heat insulating material 40 ″ ″ may be detachably coupled by the buckle 112. In this case, what is necessary is just to change the shape of the nut holding | maintenance part 93 of the attachment jig 90 to a shape which can stop a buckle by remote control.

また、図５Ｄに示すように、第１エルボ部用保温材１２０に直管部用保温材６０の一個を一体成形し、直管部用保温材に相当する部分の下側にガイド部材１２２を取り付けるようにしてもよい。この場合には、一体成形された第１エルボ部用保温材１２０と直管部用保温材６０を、左右両側方向に対称に二分割する構成とし、水平直管部２ｂに装着の際、バックル等によって周方向に結合させるのがよい。 Further, as shown in FIG. 5D, one piece of the heat insulating material 60 for the straight pipe part is integrally formed with the heat insulating material 120 for the first elbow part, and the guide member 122 is provided below the portion corresponding to the heat insulating material for the straight pipe part. You may make it attach. In this case, the integrally formed heat insulating material 120 for the first elbow part and the heat insulating material 60 for the straight pipe part are divided into two symmetrically in the left and right side directions, and the buckle is attached to the horizontal straight pipe part 2b. it is preferable Ru bound circumferentially by like.

本発明に係る配管被覆方法に使用する各構成部材の概要を示す概略側面図である。It is a schematic side view which shows the outline | summary of each structural member used for the piping coating method which concerns on this invention. エルボ部用保温材の結合状態を示す概略側面図である。It is a schematic side view which shows the combined state of the heat insulating material for elbow parts. 第１エルボ部用保温材を示す側面図、正面図及び上面図である。It is the side view, front view, and top view which show the heat insulating material for 1st elbow parts. 第２エルボ部用保温材を示す正面図、側面図及び上面図である。It is the front view, side view, and top view which show the heat insulating material for 2nd elbow parts. 結合手段の別の実施形態を示す概略側面図である。It is a schematic side view which shows another embodiment of a coupling | bonding means. 結合手段のさらに別の実施形態を示す概略上面図である。It is a schematic top view which shows another embodiment of a coupling | bonding means. 結合手段のさらにまた別の実施形態を示す概略側面図である。It is a schematic side view which shows another embodiment of a coupling | bonding means. 第１エルボ部用保温材の別の実施形態を示す概略側面図である。It is a schematic side view which shows another embodiment of the heat insulating material for 1st elbow parts. 保温材搬送装置の概略を示す一部切断側面図である。It is a partially cut side view which shows the outline of a heat insulating material conveying apparatus. 原子炉圧力容器の下側における保温材搬送装置の使用状態を示す概略図である。It is the schematic which shows the use condition of the heat insulating material conveying apparatus in the lower side of a reactor pressure vessel. 取付冶具の概略を示す一部切断側面図である。It is a partially cut side view which shows the outline of an attachment jig. 本発明に係る配管被覆方法の第２段階を示す図である。It is a figure which shows the 2nd step of the piping coating method which concerns on this invention. 本発明に係る配管被覆方法の第３段階を示す図である。It is a figure which shows the 3rd step of the piping coating method which concerns on this invention. 本発明に係る配管被覆方法の操作手順の最終段階を示す図である。It is a figure which shows the last step of the operation procedure of the piping coating method which concerns on this invention.

２原子炉圧力容器用ベント管
２ａエルボ部
２ｂ水平直管部
４原子炉圧力容器用金属保温材
６サポートビーム
１０エルボ部用保温材
２０第１エルボ部用保温材
２７ボルト
４０第２エルボ部用保温材
４８貫通穴
４９作業用穴
６０直管部用保温材
７０保温材搬送装置
９０取付冶具
１００ナット 2 Reactor pressure vessel vent pipe 2a Elbow part 2b Horizontal straight pipe part 4 Reactor pressure vessel metal heat insulating material 6 Support beam 10 Elbow part heat insulating material 20 First elbow part heat insulating material 27 Bolt 40 For second elbow part Thermal insulation material 48 Through hole 49 Work hole 60 Thermal insulation material for straight pipe part 70 Thermal insulation material transport device 90 Mounting jig 100 Nut

Claims

It divided into two parts in the longitudinal direction of the bending direction of the elbow of the pipe, combined with elbow portion consisting of the first elbow portion for thermal insulation material and the second elbow portion for a heat insulating material which is configured so as to surround the periphery of the elbow portion Preparing a heat insulating material and a plurality of heat insulating materials for the straight pipe portion ;
In a place where there is a work space, the heat insulating material for the first elbow part is arranged in the straight pipe part of the pipe, and the heat insulating material for the straight pipe part is mounted on the straight pipe part adjacent to the heat insulating material for the first elbow part. In addition, it is connected by attaching a heat insulating material for the straight pipe part adjacent to the heat insulating material for the straight pipe part, and in the same manner, an appropriate number of heat insulating materials for the straight pipe part are sequentially attached and connected. By feeding the heat insulating material for the first elbow part to one side of the elbow part along the straight pipe part,
Feeding the heat insulating material for the second elbow part to the other side of the elbow part;
Piping coating method comprising the steps of coupling the first elbow portion for a heat insulating material and said second elbow portion for thermal insulation material so as to surround the periphery of the elbow portion.

The straight pipe part heat insulating material adjacent to the first elbow part heat insulating material is provided with a guide member at the lower end of the open end, and the second elbow part heat insulating material is fed to the other side of the elbow part. The piping covering method according to claim 1 , wherein the position of the heat insulating material for the second elbow part is adjusted .

In the step of feeding the heat insulating material for the second elbow part to the other side of the elbow part, a heat insulating material conveying means for placing and conveying the heat insulating material for the second elbow part is prepared, and the heat insulating material for the second elbow part The pipe covering method according to claim 1 or 2, wherein the material is fed until it comes into contact with the heat insulating material for the first elbow part .

The pipe covering method according to claim 3 , wherein the heat insulating material conveying means is moved on a support member extending to the other side of the elbow portion .

The piping according to claim 3 , wherein a position adjusting means is disposed in the heat insulating material conveying means, and the height position of the second elbow heat insulating material is adjusted with respect to the first elbow heat insulating material. Coating method.

The pipe covering method according to any one of claims 1 to 5 , wherein the first elbow part heat insulating material and the second elbow heat insulating material are coupled by a detachable coupling means .

Bolts are embedded in the heat insulating material for the first elbow part,
In the heat insulating material for the second elbow part, a bolt through hole is formed at a position corresponding to the bolt,
In the step of joining the first elbow part heat insulating material and the second elbow part heat insulating material, the bolts of the first elbow part heat insulating material are inserted into the corresponding bolt through holes of the second elbow part heat insulating material. The pipe covering method according to claim 6 , wherein the nut is tightened and joined from the back side using a mounting jig .

The piping is a reactor pressure vessel vent pipe disposed at the bottom of the reactor pressure vessel,
The pipe covering method according to any one of claims 1 to 7 , wherein the elbow portion heat insulating material is a metal heat insulating material .