JP2554284Y2 - Split type thermal insulation equipment for nuclear power plant piping - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a split type heat insulating device attached to a pipe of a nuclear power plant.

[0002]

2. Description of the Related Art In a nuclear power plant, inspections must be carried out during the operation period of the nuclear power plant. In order to minimize the temperature, a split-type heat retaining device that is easily detachable is adopted.

[0003] The inventors of the present invention have previously described the Japanese Utility Model Application Laid-Open No. 2-122229.
In No. 6 (Jpn. Pat. Appln. KOKAI Publication No. 1-32490), among the divided heat insulating materials divided so as to embrace the pipe, the divided single pieces adjacent to each other in the circumferential direction of the pipe are mutually connected by a buckle-type latching fitting. There has been proposed a split-type heat retaining device that is configured so as to be connected to each other so as to connect divided single units adjacent to each other in the axial direction of a pipe with a rod sliding connection fitting.

[0004] In the rod sliding connection fitting, an operation handle is rotatably provided on a support shaft as a fulcrum on a holder for slidably supporting the rod. A first metal fitting that allows the supported rod to slide back and forth; and a second metal fitting made of a member that receives the rod of the first metal fitting, and inserts the rod of the first metal fitting into the second metal fitting. By doing so, the divided single bodies adjacent in the axial direction are connected.

[0005] In the case of attaching the divided heat insulating material to the pipe, all of the divided pieces adjacent to each other in the circumferential direction and the axial direction of the pipe may be connected by a hook-type connecting fitting such as a buckle type. The buckle-type bracket can withstand the tensile force, but cannot bear the shearing force.Therefore, when inspecting the piping, when removing any split single unit, the splits arranged on the same circumference as the removed single unit If the load of a single unit acts as a circumferential shearing force on a latch-type connection fitting that connects these divided single unit and the divided single unit adjacent in the axial direction, the bracket may be damaged. On the other hand, according to the use of the rod sliding type connection fitting, since the shear force acting in the circumferential direction can be received by the strong rod member, there is no possibility of breakage, and the divided single unit is not used. It is possible to prevent misalignment and falling off in the circumferential direction.

Further, since the rod-sliding connection fitting has a structure in which the rod is slidable by rotating the handle, the first and second fittings constituting the connection fitting are connected. This is advantageous in that the connection can be quickly released, and the work of attaching and detaching the divided unit can be speeded up.

[0007]

However, in the split type thermal insulation device for piping having the above-described structure, the rod-sliding type connection fitting for connecting the divided units adjacent in the axial direction of the pipe is functionally simply a rod. The structure is such that the first metal fitting and the second metal fitting are only engaged by the insertion, so even if it is strong against the shearing force, the divided single bodies adjacent to each other in the axial direction are attracted to each other through the two metal fittings and adhere to each other. There is no pulling force to make it work. In addition, there is no resistance force for holding the divided unit so as not to be separated from the adjacent position via both metal fittings.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and makes use of the advantages of the rod-sliding type connection fitting described above, as well as a first fitting and a second fitting which constitute the fitting. A main object of the present invention is to provide a split-type heat insulation device for nuclear power plant piping that can draw adjacent single units through metal fittings to make them adhere to each other, and hold the split single units so as not to separate from each other. I have.

[0009]

SUMMARY OF THE INVENTION The present invention provides a nuclear power plant constructed by covering a nuclear power plant pipe by arranging divided heat insulating materials divided so as to embrace the pipe in a circumferential direction and an axial direction of the pipe. In a split type heat retaining device for a pipe, the divided single pieces that are adjacent to each other in the circumferential direction of the pipe are connected by a hook-type connecting bracket, and the split single piece that is adjacent to the pipe in the axial direction is a holder that slidably supports a rod. A first fitting having a handle rotatably provided on the handle, and a hook member rotatably supported by the handle; and a recess capable of hooking the hook member on a member for receiving the rod of the first fitting. Is connected by a connection fitting made of a combination with a second fitting provided with a second fitting.

[0010]

In the split type thermal insulation apparatus for nuclear power plant piping of the above configuration, when an arbitrary split single unit is removed, the split single units arranged on the same circumference as the removed split single unit are separated from each other in the axial direction. Since it is connected and held via the connection fitting which can sufficiently bear the shearing force due to the load of the single unit and the divided single unit, positional displacement in the circumferential direction is prevented.
In addition, when the handle of the first metal fitting is turned, the hook member of the first metal fitting is hooked on the second metal fitting so that the first metal rod is inserted into the second metal fitting. A pulling force is generated between the two fittings via the hook member, and the two fittings are firmly connected by this pulling force, and at the same time, the divided single pieces are brought into close contact with each other.

[0011]

1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view showing a state in which a pipe is covered with a single piece of a heat insulating material, and FIG. 2 is an axial direction of the pipe. , FIG. 3 is a plan view, FIG. 4 is a cross-sectional view, and FIG. 5 is a side view of the connection 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 pieces so as to embrace the pipe,
The divided single pieces arranged in the circumferential direction of the pipe are connected to each other by buckle type latching connection fittings 1a and 1b, and the divided single pieces arranged adjacent to each other in the axial direction of the pipe are connected to each other by a connection fitting B.

[0013] The connecting fitting B first fitting b ₁ and the second
Consisting of a combination of metal fittings b _2. First fitting b ₁ is constructed as follows. That is, the forked plate portion 4a of the handle 4 is hung on the holder 3 that slidably supports the rod 2, and is rotatably mounted around the shaft 5 as a support shaft.
On the other hand, a pin 6 pierced in the diameter direction of the rod 2 is inserted through a guide elongated hole 3a of the holder 3 (see FIG. 5) into a guide elongated hole 4b of the bifurcated plate portion 4a. The rod 2 supported by the holder 3 can be slid back and forth by rotation. Further, a forked plate portion 7a of a hook member 7 is hung on the outer portion of the forked plate portion 4a of the handle 4, and is rotatably mounted on a shaft 8 as a support shaft. the tip of the Joban portion 7a, hooked hooking portion 7 to the second fitting b ₂ to be described later
b is provided. Further, a lock member 9 with a knob for locking the rod 2 in the forward sliding position is provided on the upper surface side of the holding body 3. 10 is a lock member 9
Is a coil spring that urges the lock member toward the rod side, and a tip of the lock member 9 is formed in a concave portion 2
a (see FIG. 3), the rod is locked. A receiving cylinder 13 for receiving an operation rod 12 (see FIG. 5) for rotating the handle 4 is fixed to a rear end portion of the holder 3 by means such as welding.

The second fitting b ₂ is mainly provided with a bearing body 14 capable of receiving the rod 2 of the first fitting b ₁ .
The upper surface side to the first fitting b ₁ side of the recess 14a for receiving the hooking portion 7b of the hook member 7 [see Fig. 4] is formed.

The above-mentioned heat insulation apparatus for a nuclear power plant is constructed at the construction site according to the following procedure. First, the divided single unit A is applied to the pipe, and the pipes are sequentially connected in the circumferential direction by the latching connection fittings 1a and 1b, and a part of the pipe is annularly covered with the divided single unit. Next, the divided single bodies A having the pipes annularly covered as described above are applied adjacently in the axial direction to the divided single bodies A, and these are sequentially connected in the circumferential direction. Thereafter, the divided single bodies adjacent in the axial direction are connected to each other by the connection fitting B. Connecting operation by coupling fitting B is divided single A first fitting b ₁ and the second fitting b ₂ before installation, A
Generally, it is performed by rotating the handle 4. However, the second fitting b ₂ is
As state previously accepted rods fitting b _1, divided single A adjacent the axial direction, the first bracket to A b ₁ and the second
Each stop rivets fittings b _2, set screws, can take construction process of fixing by welding or the like. In this case, there is no need for the work of aligning the rod at the construction site.

FIGS. 2 to 4 show a state where the first fitting b ₁ and the second fitting b ₂ are connected, and FIG. 5 shows a state where the connection is released. I.e., the operating rod 12 to the bushing 13 that is secured to the rear end portion of the first fitting b ₁ side of the handle 4 by inserting and turning the handle 4 to the left or right through the operation rod 12 Accordingly, it is possible to extract the rod 2 inserted into the second bearing member 14 of the fitting b _2, or from the bearing member 14. When the rod is inserted, the hook member 7 rotatably attached to the handle 4 is rotated to engage the hook portion 7 a of the hook member 7 with the concave portion 14 a of the bearing body 14. , A pulling force is generated between the metal fittings b ₁ and b ₂ via the hook member 7 at the same time as the rod is inserted, whereby the adjacent divided units A and A are brought into close contact with each other. It is firmly held in a close contact state. In that case, even if there is some deviation in the mounting position of the first metal fitting and the second metal fitting,
By inserting the rod, the relative position of the divided single body is accurately regulated via the first metal fitting and the second metal fitting.

The locking member 9 is fitted in the recess 2a of the rods 2 [see Fig. 4] is a rod 2 inserted into the second bearing member 14 of the fitting b _2, to securely lock its insertion position It is provided in. When the rod 2 is pulled out, the handle 4 is rotated in a state where the lock is released by pulling up the rod member 9. The distal end of the lock member 9 pulled up at the time of pulling out of the rod is separated from the concave portion 2a of the rod and is located on the peripheral surface of the rod. At the place 2a.

In the structure of the connection fitting B of the above embodiment, the operating rod 12 is used to facilitate the turning operation of the handle 4, but the receiving cylinder 13 of the operating rod is omitted and the handle 4 is removed.
May be directly rotated. Further, the lock member 9 is for locking the rod 2 at the insertion position more securely, and may be omitted.

Although the above-described embodiment is an example in which the present invention is applied to a case where a single unit is coated on a horizontal pipe, the present invention can also be applied to a single unit where a vertical pipe is covered. In the case of this vertical pipe, there is a possibility that the divided unit may separate from each other due to the weight of the divided unit.
Since the metal fittings are firmly connected by the hook members, there is no danger that the divided simple substances are separated from each other.

[0020]

[Effect of the Invention] According to the heat insulation device for a nuclear power plant piping according to the present invention, the heat insulating materials divided in the circumferential direction and the axial direction of the piping can be quickly and accurately and firmly attached. Even if any one of the divided units is removed at the time of maintenance and inspection, there is no danger that the other divided units will be displaced or fall off, and the work of attaching and detaching the divided units can be performed quickly and safely.

In particular, in the present invention, in the connecting bracket used for connecting the divided single bodies adjacent in the axial direction of the pipe,
When the handle of the first metal fitting is turned, the hook member of the first metal fitting is hooked on the second metal fitting so that the first metal fitting rod is inserted into the second metal fitting. A pulling force is drawn between the two brackets via
The two metal fittings can be firmly connected by this tensile force, and at the same time, the adjacent divided single bodies can be brought into close contact with each other, so that the heat insulating property can be further improved. That is, in the connection fitting used in the present invention,
In the sliding direction (X-axis direction) of the rod, the first and second metal fittings are resisted by a pulling force that draws each other together, and in the Y-axis direction and the Z-axis direction, they are resisted by a shearing force. Has an excellent function of simultaneously constraining the construction, and can greatly contribute to the improvement of workability, safety, and heat insulation at the time of covering and applying a single unit to a nuclear power plant piping and maintenance and inspection work.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, showing a state in which a nuclear power plant piping is coated with a divided heat-retaining simple substance.

FIG. 2 is a side view of a connection fitting for connecting divided single bodies adjacent in the axial direction.

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

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

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

[Explanation of symbols]

P pipe A heat insulator divided alone 1a, connecting fitting b ₁ first fitting b ₂ second fitting 2 rod 2a recesses 3 lifting receptacle for connecting the divided single adjacent 1b buckle type latch type connection fitting B axis direction 3a Guide slot 4 Handle 4a Bifurcated plate portion 5 Shaft 6 Pin 7 Hook member 7a Bifurcated plate portion 7b Hook portion 8 Shaft 9 Lock member 10 Tube portion 11 Spring 12 Operating rod 13 Receiving cylinder 14 Bearing body 14a Recess

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A split type heat insulating apparatus for nuclear power plant piping, which is constructed by arranging and dividing a heat insulating material divided so as to embrace a nuclear power plant piping in a circumferential direction and an axial direction of the piping. The divided units adjacent in the circumferential direction of the pipe are connected by a hook-type connection bracket, and the divided units adjacent in the axial direction of the pipe are rotatably operated by a holding body that supports the rod slidably. A first fitting provided with a hook member rotatably supported by the handle; and a second fitting provided with a recess capable of hooking the hook member on a member for receiving the rod of the first fitting. A split type heat insulating device for nuclear power plant piping, which is connected by a connecting fitting comprising a combination of