JPH0738894U - Split type heat insulation device for nuclear power plant piping - Google Patents

Abstract

(57) [Summary] [Purpose] The division of the heat insulating material arranged in the circumferential direction and the axial direction of the pipe can be installed quickly and accurately and firmly, and even if any division is removed, other divisions can be made. (EN) Provided is a split type heat retention device for piping of a nuclear power plant, in which there is no risk of misalignment or dropping of a single unit, and which enables quick detachment / attachment work of a single unit. [Structure] Divided single bodies A that are adjacent to each other in the circumferential direction of the pipe are connected by a buckle-type hook-type connecting fitting. In the divided unit A adjacent in the axial direction of the pipe, a bifurcated operation handle 4 is rotatably provided on a holder 3 that slidably supports a rod 2, and a hook member 7 is rotatably provided on the handle 4. From the first metal fitting b ₁ provided and the second metal fitting b ₂ provided with the recess 14a capable of hooking the hooking portion 7b of the hook member 7 on the bearing body 14 that receives the rod 2 of the first metal fitting. Connect with the connecting metal fittings. [Effects] By using the connecting fitting B, it is possible to bear the shearing force received from the weight of the divided pieces and to firmly attach the divided pieces to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a split type heat retaining device attached to piping of a nuclear power plant.

[0002]

[Prior art]

 In nuclear plants, it is legally obligatory to carry out inspections during the service period.Therefore, heat insulation materials that cover the piping of the plant should be attached and detached to minimize the exposure dose during maintenance and inspection work under radiation. A split-type heat retaining device is adopted for easy operation.

The inventors of the present invention have previously found that, in Japanese Utility Model Laid-Open No. 122222/1990 (Japanese Patent Application No. 1-23490), a circle of a pipe is included in a divided single piece of a heat insulating material divided so as to embrace the pipe. Split type heat retaining device configured so that the split single units that are adjacent to each other in the circumferential direction are connected with a buckle-type hooking type connecting fitting, and the split single units that are adjacent to each other in the axial direction of the pipe are connected with a rod sliding type connecting fitting. Is proposed.

In the rod slide type connection fitting, an operation handle is rotatably provided on a holder for slidably supporting the rod with a support shaft as a fulcrum, and the holder is rotated by rotating the handle. And a second metal fitting made up of a member for receiving the rod of the first metal fitting, wherein the rod supported by the first metal fitting is used as a second metal fitting. By inserting it, the divided single bodies that are adjacent in the axial direction are connected.

In the case of attaching the divided single body of the heat insulating material to the pipe, all the divided single bodies which are adjacent to each other in the circumferential direction and the axial direction of the pipe may be connected by a buckling type connecting metal fitting. , The buckle type metal fittings can withstand tensile force but cannot bear shearing force, so when detaching any split unit during pipe inspection work, it is arranged on the same circumference as the removed split unit. If the load of the divided single units acts as a shearing force in the circumferential direction on the latching type connecting metal fittings that connect these divided single bodies to the axially adjacent divided single bodies, the metal fittings may be damaged. . On the other hand, when the rod sliding type connection fitting is used, the shearing force acting in the circumferential direction can be received by the rod member which is strong in terms of strength, so that there is no risk of breakage and the splitting. It is possible to prevent the unit from being dislocated in the circumferential direction and falling off.

Further, since the rod-sliding connection metal fitting is configured such that the rod can be slid by the turning operation of the handle, the first metal fitting and the second metal fitting forming the connection metal fitting are connected to each other. It is advantageous in that the connection and disconnection can be performed quickly, and the detachment work of the divided unit can be speeded up.

[0007]

[Problems to be solved by the device]

 However, in the split type heat retention device for pipes having the above-mentioned configuration, the rod sliding type connecting metal fittings that connect the divided single bodies adjacent to each other in the axial direction of the pipe are functionally connected to the first metal fittings by simply inserting the rod. Since it is a structure that only engages two metal fittings, even if it is strong against shearing force, there is no tensile force for pulling together and closely adhering the divided single bodies that are adjacent in the axial direction through both metal fittings. In addition, there is no resistance force for holding the split unitary body so as not to separate from the adjacent position via both the metal fittings.

[0008]

[The purpose of the device]

 The present invention has been made in order to solve the above problems, and makes use of the advantages of the rod sliding type connecting metal fitting described above, and through the first metal fitting and the second metal fitting which constitute the metal fitting, The main object of the present invention is to provide a split type heat insulation device for piping in a nuclear power plant, which is capable of attracting and bringing into close contact with adjacent split single units and holding them so that they do not separate from each other.

[0009]

[Means for Solving the Problems]

 The present invention relates to a split type heat retention device for a nuclear plant pipe, which is constructed by arranging and covering a divided single piece of a heat insulating material that is divided so as to hold a nuclear plant pipe in the circumferential direction and the axial direction of the pipe. Of the unit that are adjacent to each other in the circumferential direction of the pipe are connected by a hook-type connecting fitting, and the unit of the unit that is adjacent to the axial direction of the pipe is provided with a rotating handle on a holder that slidably supports the rod. A first metal fitting in which a hook member is rotatably supported by the handle, and a recess for hooking the hook member in a member for receiving the rod of the first metal fitting. The gist is that they are connected by a connecting metal fitting that is a combination of metal fittings.

[0010]

[Action]

 In the split heat insulation device for nuclear power plant piping configured as described above, when an arbitrary split single unit is removed, the split single units arranged on the same circumference as the removed split single unit are divided into adjacent split single units. Since they are connected and held via connecting metal fittings that can sufficiently bear the shearing force due to the load of the divided units, positional deviation in the circumferential direction is prevented. When the first metal fitting side rod is inserted into the second metal fitting side by hooking the first metal fitting side hook member on the second metal fitting side when rotating the handle on the first metal fitting side, A pulling force is drawn between the metal fittings via the hook member, and the two metal fittings are firmly connected by this pulling force, and at the same time, the divided single bodies are brought into close contact with each other.

[0011]

【Example】

 1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view of a pipe in which a heat insulating material is divided and covered with a single piece, and FIG. 2 is a division adjacent to the axial direction of the pipe. 3 is a plan view, FIG. 4 is a cross-sectional view, and FIG. 5 is a side view of the connection metal fitting in a state where the connection is released.

In the figure, P is a pipe, A is a box-shaped divided unit divided into a plurality of pipes so as to embrace the pipe, and the divided units arranged in the circumferential direction of the pipe are buckle-type hooks. The divided units that are connected by the formula connection fittings 1a and 1b and are arranged adjacent to each other in the axial direction of the pipe are connected by the connection fitting B.

The connecting fitting B is a combination of a first fitting b ₁ and a second fitting b ₂ . The first metal fitting b ₁ is configured as follows. That is, the bifurcated plate portion 4a of the handle 4 is attached to the holding body 3 which slidably supports the rod 2 and is rotatably mounted around the shaft 5 as a supporting shaft. The pin 6 penetrating in the diametrical direction is inserted into the guide long hole 4b of the bifurcated plate portion 4a through the guide long hole 3a of the holder 3 [see FIG. 5], and the handle 4 is rotated to hold the pin 6. The rod 2 supported by the receiving body 3 can be slid back and forth. Further, the fork-shaped plate portion 7a of the hook member 7 is wrapped around the outer portion of the forked-plate portion 4a of the handle 4 and is rotatably attached about a shaft 8 as a supporting shaft. the tip of the bifurcated plate portion 7a, it hooked hooking portion 7b to the second fitting b ₂ to be described later is provided. Furthermore, a lock member 9 with a knob for locking the rod 2 at the forward sliding position is provided on the upper surface side of the holder 3. Reference numeral 10 is a cylindrical portion for guiding the lock member 9, 11 is a coil spring for urging the lock member toward the rod, and the tip of the lock member 9 is a recess 2a formed on the peripheral surface of the rod 2 by the action of the spring 11. The rod is locked by being fitted into [see FIG. 3]. At the rear end portion of the holding body 3, a receiving barrel 13 for receiving an operating rod 12 [see FIG. 5] for rotating the handle 4 is fixed by means such as welding.

A second fitting b _2, the first fitting b bearing body 14 capable of receiving a rod 2 of ₁ is the main unit, hooking portions of the first fitting b ₁ side of the hook member 7 on its upper surface A concave portion 14a [see FIG. 4] for receiving 7b is formed.

The above-mentioned heat retaining device for a nuclear power plant is constructed at the construction site according to the following procedure. First, the divided unit A is applied to the pipe and sequentially connected in the circumferential direction by the hook-type connecting metal fittings 1a and 1b, and a part of the pipe is annularly covered with the divided unit. Next, as described above, the divided unit A having the annular coating of the pipes is abutted with the unit A adjacent to each other in the axial direction, and these are sequentially connected in the circumferential direction. After that, the divided single bodies that are adjacent to each other in the axial direction are connected by the connecting fitting B. The connecting work by the connecting metal fitting B is generally performed by fixing the first metal fitting b ₁ and the second metal fitting b ₂ to the divided single bodies A and A before construction and rotating the handle 4. Is. However, with the second metal fitting b ₂ receiving the rod of the first metal fitting b ₁ in advance, the first metal fitting b ₁ and the second metal fitting b ₂ are respectively attached to the divided single units A and A adjacent to each other in the axial direction. It is also possible to take a construction procedure of fixing by fastening, screwing, welding or the like. In this case, it does not take time and effort for the rod centering work at the work site.

2 to 4 show a state in which the first metal fitting b ₁ and the second metal fitting b ₂ are connected, and FIG. 5 shows a state in which the connection is released. That is, the operating rod 12 is inserted into the receiving tube 13 fixed to the rear end portion of the handle 4 on the side of the first metal fitting b _1, and the handle 4 is rotated rightward or leftward via the operating rod 12. As a result, the rod 2 can be inserted into or withdrawn from the bearing body 14 of the second metal fitting b ₂ . When the rod is inserted, the hook member 7 rotatably attached to the handle 4 is pivotally operated to engage the hooked portion 7a of the hook member 7 with the recess 14a of the bearing body 14, By rotating the handle 4, a pulling force pulling the _two metal fittings b ₁ and b ₂ from each other via the hook member 7 is generated at the same time when the rod is inserted. They are brought into close contact with each other and firmly held in the close contact state. In that case, even if the mounting positions of the first metal fitting and the second metal fitting are slightly displaced, the relative position of the split unit is accurately regulated by the insertion of the rod through the first metal fitting and the second metal fitting.

The lock member 9 [see FIG. 4] fitted in the recess 2 a of the rod 2 reliably locks the rod 2 inserted in the bearing body 14 of the second metal fitting b _{2 at} the insertion position. It is provided for the purpose. When pulling out the rod 2, the handle 4 is rotated while the rod member 9 is pulled up and unlocked. Further, the tip of the lock member 9 pulled up when pulling out the rod is placed on the peripheral surface of the rod apart from the recess 2a of the rod, but when the rod is inserted, the action of the spring 10 automatically causes the rod 2 to move. It is fitted in the recess 2a.

In the configuration of the connecting fitting B of the above-mentioned embodiment, the operating rod 12 is used to facilitate the turning operation of the handle 4. However, the receiving cylinder 13 of this operating rod is omitted and the handle 4 is directly attached. It may be configured to rotate. Further, the lock member 9 is for more surely locking the rod 2 placed at the insertion position, and this may be omitted.

Further, although the above-mentioned embodiment shows an example in which the split single body is coated on the horizontal pipe, the present invention can also be applied to the split single body coating on the vertical pipe. In the case of this vertical pipe, there is a possibility that the divided individual pieces may separate from each other due to the weight of the divided individual pieces, but since the first metal fitting and the second metal fitting are firmly connected by the hook member, there is no possibility that the divided single pieces may be separated from each other. Absent.

[0020]

[Effect of device]

 According to the heat insulation device for nuclear power plant piping according to the present invention, it is possible to quickly and accurately and firmly attach the divided heat insulating materials arranged in the circumferential direction and the axial direction of the pipe, and at the There is no risk of misalignment or dropping of other divided units even if the divided unit is removed, and the detaching operation of the divided unit can be performed quickly and safely.

In particular, in the present invention, in the case of the connecting metal fitting used for connecting the divided single bodies adjacent to each other in the axial direction of the pipe, when the handle of the first metal fitting is rotated, the hook member of the first metal fitting is attached. By hooking on the second metal fitting side, when the rod on the first metal fitting side is inserted into the second metal fitting side, a pulling force is drawn between the two metal fittings via the hook member, and this pulling force is generated. Both metal fittings can be firmly connected, and at the same time, the adjacent split units can be brought into close contact with each other, so that the heat insulation can be further improved. That is, in the connecting fitting used in the present invention, the pulling force pulling the first and second fittings toward each other in the sliding direction of the rod (X-axis direction) resists each other, and also in the Y-axis direction and the Z-direction. Since it has an excellent function of simultaneously resisting the axial direction by shearing force and constraining it in the three directions at the same time, the workability and safety at the time of coating the split unit to the nuclear power plant piping and maintenance work In addition, it can greatly contribute to the improvement of heat insulation.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a perspective view showing a state in which a nuclear insulation plant is covered with a divided heat insulating unit.

FIG. 2 is a side view of a connecting fitting for connecting the divided single bodies that are adjacent to each other in the axial direction.

FIG. 3 is a plan view of the connecting fitting.

FIG. 4 is a cross-sectional view of the connecting fitting.

FIG. 5 is a side view of the connection fitting in a state where the connection is released.

[Explanation of symbols] P Piping A Split heat insulating material single unit 1a, 1b Buckle type latching type connection metal fitting B Connection metal fitting for connecting split single elements adjacent in the axial direction b ₁ First metal fitting b ₂ Second metal fitting 2 Rod 2a Recessed Location 3 Holding body 3a Guide long hole 4 Handle 4a Bifurcated plate portion 5 Shaft 6 pin 7 Hook member 7a Bifurcated plate portion 7b Hooking portion 8 Shaft 9 Lock member 10 Cylindrical portion 11 Spring 12 Operating rod 13 Receiving cylinder 14 Bearing body 14a Recess

Claims (1)

[Scope of utility model registration request] 1. A split type heat retention device for a nuclear power plant pipe, which is constructed by arranging and covering a divided single piece of a heat insulating material which is divided so as to hold a nuclear power plant pipe in a circumferential direction and an axial direction of the pipe, The separate pipes that are adjacent to each other in the circumferential direction of the pipe are connected by a hook-type connecting metal fitting, and the separate pipes that are adjacent to each other in the axial direction of the pipe have an operating handle that is rotatable on a holder that slidably supports the rod. A first metal fitting provided on the handle, in which a hook member is rotatably supported, and a second metal fitting having a recess for hooking the hook member on a member for receiving a rod of the first metal fitting. A split type heat retaining device for piping of a nuclear power plant, which is connected by a connecting metal fitting made of a combination of