JPH0451437B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a horizontal tank for a fast breeder reactor, and particularly to a fast breeder tank suitable for absorbing thermal expansion of a support plate even in the event of fluid leakage. This invention relates to a support plate for a horizontal tank in a furnace.

[Background of the invention]

The overall structure of a conventionally known horizontal tank for a fast breeder reactor is shown in FIGS. 4 to 6.

In FIG. 4a, the main body 1 of the horizontal tank is supported by fixed legs 2 and floating legs 3, and the fixed legs 2 and floating legs 3 are joined to support plates 4, 5. Further, the support plates 4 and 5 are joined to a sole plate 6, as shown in FIG. 4b, which is an enlarged view of A in FIG. is fixed. The bolts 8 connecting the support plates 4, 5 and the sole plate 6 are arranged as shown in FIG. The dimensions are approximately the same as those of the bolt holes 9 arranged in a row, so that the sole plate 6 and the support plate 4 are restrained from moving forward, backward, left or right. In contrast,
As shown in FIG. 6, the support plate 5 on the side of the floating leg 3 has bolt holes 11 arranged in two horizontal rows in an oval shape along the longitudinal direction of the horizontal tank body 1. 5 and sole plate 6 are structured to be movable in the longitudinal direction of the horizontal tank.

In the horizontal tank configured as described above, high-temperature coolant heated by the reactor plant flows into the tank during maintenance of the reactor plant.
The horizontal tank main body 1 mainly thermally expands in its longitudinal direction. At this time, since the bolt hole 9 of the support plate 4 of the fixed leg 2 is approximately the same diameter as the bolt 8 for joining to the sole plate 6, the fixed leg 2 is prevented from moving forward, backward, left or right. On the other hand, floating leg 3
is the bolt hole 1 drilled in the support plate 5
1 has an oval shape in the same direction as the longitudinal direction of the horizontal tank main body 1, so that the support plate 5 has an oval shape in the same direction as the longitudinal direction of the horizontal tank main body 1.
It has a structure that allows it to move left and right. Therefore, even if high-temperature coolant flows into the horizontal tank and the horizontal tank main body 1 expands thermally in the longitudinal direction, the floating legs 3 will not move due to this thermal expansion. It is now possible to absorb it. Furthermore, the shear force of the bolts 8 that connect the support plates 4, 5 and the sole plate 6 is sufficient in terms of earthquake resistance.

However, in the horizontal tank configured as described above, when taking into account coolant leakage, the coolant flows from the horizontal tank main body 1 through the fixed legs 2 or the floating legs 3 to the support plate 4 or Reach 5. At this time, the support plates 4 and 5 expand as shown by dotted lines in FIG. 7 due to the heat of the coolant. At this time, due to thermal expansion of the structural members of the support plates 4, 5 located between the bolt holes 9, 10, the bolts 8 connecting the support plates 4, 5 and the sole plate 6 are subjected to high shear force. In the end, shearing of the bolt occurs and the bolt 8 is damaged. As a result, the fixed legs 2 and 3, which were supporting the horizontal tank body 1, are replaced by the support plate 4,
5 is no longer connected to the sole plate 6, and in the worst case, the horizontal tank may fall over, resulting in a loss of structural integrity.

Used as legs for horizontal tanks for high temperatures in 1974.
There is an example described in Publication No. 37451. But this is
Since it consists of a link mechanism and a mating structure, consideration was not taken during an earthquake, and structural soundness could not be satisfied.

[Purpose of the invention]

An object of the present invention is to provide a support plate structure for a horizontal tank that can improve the structural integrity of the horizontal tank even when high-temperature coolant leaks.

[Summary of the invention]

In order to achieve such an object, the present invention includes a fixed leg and a floating leg that are arranged in parallel in the longitudinal direction of a horizontal tank, and the fixed leg and the floating leg are respectively joined to separate support plates. Each of the support plates is bolted to the sole plate;
In a support plate structure for a horizontal tank in which the sole plate is fixed to a foundation with an anchor bolt, the fixing leg has a protrusion having a symmetrical cross-sectional shape approximately in the center of the support plate and the sole plate, and the protrusion has a symmetrical cross-sectional shape. The horizontal tank is loosely fitted into a point-symmetrical hole formed in the support plate with longitudinal and lateral directions regulated, and is joined to a hole formed in the sole plate, and the floating leg is connected to the hole formed in the sole plate. Approximately in the center of the support plate and the sole plate, there is a linear-shaped protrusion extending along the longitudinal direction of the horizontal tank, and this protrusion is inserted into the linear-shaped hole formed in the support plate. The supporting plate is loosely fitted with the hand direction regulated and joined to the sole plate, and the support plate is fixed to the sole plate with the vertical direction regulated by bolts with a loose hole formed therein. be.

According to the above configuration, when the horizontal tank expands in the longitudinal direction due to the heat of the coolant, the floating legs are movable in the longitudinal direction, so that the thermal expansion of the horizontal tank can be absorbed.

In addition, even if high-temperature coolant leaks from the horizontal tank and reaches the support plate through the fixed legs or floating legs, and the support plate expands due to heat, the fixed legs and floating legs will remain at approximately the center of the support plate. Because the support plate is positioned so that the elongation due to thermal expansion of the support plate is averaged in each direction, and the bolt holes that fix the support plate to the sole plate are blank holes, the thermal expansion of the support plate is equalized in each direction. There is no effect on the floating leg or sole plate.

Furthermore, in the event of an earthquake, the shearing force transmitted from the sole plate to the support plate via the fixed leg or the floating leg can be similarly absorbed, and only a minimum number of bolts are required to support the load only in the vertical direction.

[Embodiments of the invention]

An embodiment of the support plate structure for a horizontal tank according to the present invention will be described with reference to FIGS. 1 to 3. In this figure, the same reference numerals as in FIGS. 4 to 6 indicate the same materials.

The horizontal tank body 1 is joined to fixed legs 2 and floating legs 3, which are supporting legs, and the fixed legs 2 and floating legs 3 are joined to support plates 4 and 5. Furthermore, the support plates 4 and 5 are provided with a sole plate 6.
This sole plate 6 is fixed to the foundation by anchor bolts 7.

The fixed leg 2 has a protrusion having a cross-shaped cross section approximately at the center of the contact surface of the sole plate 6, and this protrusion is fitted into a cross-shaped hole formed in the surface of the sole plate 6. .

Furthermore, the floating leg 3 has a linear protrusion extending along the longitudinal direction of the horizontal tank at approximately the center of the contact surface of the sole plate 6, and this protrusion is formed on the surface of the sole plate 6. It is fitted into a single-shaped hole.

In the above structure, when high-temperature sodium heated by the reactor plant flows into the horizontal tank main body 1 during maintenance of the nuclear reactor plant, the horizontal tank main body 1 is heated by the heat of the coolant.
Thermal expansion occurs in the longitudinal direction. As a result, the fixed legs 2, which are supporting legs supporting the horizontal tank body 1,
As shown in FIG. 8, the key slot 9 drilled in the support plate 4 is also drilled in the longitudinal direction and perpendicular direction of the horizontal tank body 1, and the key slot 9 is also drilled in the longitudinal direction and perpendicular direction of the horizontal tank body 1. The supporting plate 5 has a key slot 1 for being coupled to the sole plate 6.
0 is opened parallel to the longitudinal direction of the horizontal tank main body 1, so thermal expansion of the horizontal tank main body can be absorbed because the floating legs are movable in the longitudinal direction. . In FIG. 8, the dotted line on the floating leg side 5 indicates the position at the time of thermal expansion.

Further, if the coolant leaks, the coolant leaking from the horizontal tank body 1 reaches the support plates 4 and 5 through the fixed legs 2 or the floating legs 3, which are supporting legs. At this time, this coolant is still at a high temperature, and it is necessary to consider the thermal expansion of the support plates 4 and 5 themselves. In this case, the key slots 9, 10 for joining the support plates 4, 5 and the sole plate 6 are
An opening is made in the center of the support plate 4, and the shearing force due to thermal expansion of the support plate 4 itself is not applied to the key at this location, as shown in FIG. A dotted line in the figure indicates a state in which the support plate 4 itself is thermally expanded. Furthermore, due to coolant leakage, the support plates 4 and 5 become high temperature, and the support plates 4 and 5 become hot.
Even if the support plates 4 and 5 undergo thermal expansion, the bolt holes in the bolts 12 that connect the support plates 4 and 5 and the sole plate 6 are made with blank holes, so that the shear caused by the thermal expansion of the support plate 4 will occur as shown in FIG. No force is applied, and the bolt 12 can be prevented from breaking.

As described above, the horizontal tank of a fast breeder reactor that employs a support plate like this structure can be used even if high temperature coolant flows in and the horizontal tank main body 1 expands thermally during reactor maintenance. , the floating legs 3 can absorb the elongation due to this thermal expansion, and furthermore, if the coolant leaks, the thermal expansion of the support plates 4, 5 themselves due to the high temperature coolant will also be absorbed by the support plates 4, 5.
It is possible to create a structure that does not generate shearing force on the key 8 that connects the sole plate 6 to the key 8.

In addition, since no shearing force is applied to the key 8, and the support plates 4 and 5 are pulled vertically due to the moment generated in the horizontally placed tank, the shear force is applied to the periphery of the support plates 4 and 5. This can be dealt with by drilling a hole (dumb hole) that does not work, and installing a bolt 12 to support the load only in the tensile direction. Thereby, it is only necessary to consider that the bolts 12 installed on the support plates 4 and 5 receive a load in the tensile direction, and the number of bolts 12 can be reduced compared to the conventional case.

Next, another embodiment of the present invention will be described using FIG. 10. A circular key hole 15 is provided in the center of the support plate 4, which supports the horizontal tank body 1 and is joined to the fixed legs 2. On the other hand, the support plate 5 on the side of the floating leg 3 has a key hole 10 provided in the center of the support plate 5 in parallel to the longitudinal direction of the horizontal tank body 1.

According to the horizontal tank support structure having such a configuration, when high-temperature coolant flows into the tank during reactor maintenance and the horizontal tank expands in the longitudinal direction of the tank, the support structure is joined to the fixed legs 2. The support plate 4 exerts a shearing force with the sole plate 6 or the foundation using the circular key 16, so that the fixed leg 2 does not move, and the thermal expansion of the horizontal tank is absorbed by the floating leg 3.
Since the bolt holes of the support plate 5 are opened parallel to the longitudinal direction of the horizontal tank body 1, the support plate 5 can absorb water as it moves on the sole plate 6.

Furthermore, even in the event of coolant leakage, since there is only one support plate 4 located at the center of the key hole 15, it is unlikely that the key 16 will be sheared due to thermal expansion. However, in this case, it is necessary to provide bolts 12 around the support plates 4 and 5 to prevent the horizontal tank from falling over. However, the purpose of installing this bolt is not to receive shear, but to suppress the force in the vertical direction of the support plates 4 and 5, so the bolt hole 13 is a blank hole with a gap between it and the bolt 12. , and the shearing force due to thermal expansion no longer acts. Furthermore, since the shear force due to earthquake resistance acts on the key 16, it is also advantageous in terms of earthquake resistance.

In the above-mentioned embodiment, the protrusion on the abutment surface of the sole plate of the fixed leg has a cruciform or circular cross-sectional shape, but it goes without saying that other shapes, that is, point-symmetric shapes, can also have the same effect. It is.

〔Effect of the invention〕

As is clear from the above explanation, according to the support plate structure of the horizontal tank of the present invention, the fitting structure of the fixed leg and the floating leg is located approximately at the center of the support plate, and the horizontal tank and the support plate Since the elongation due to thermal expansion can be absorbed, the structural integrity of the horizontal tank can be improved even in the event of a leak of high-temperature coolant or even in the event of an earthquake.

[Brief explanation of the drawing]

1 to 3 are configuration diagrams showing one embodiment of the support plate structure of a horizontal tank according to the present invention, FIG. 1 is a plan view, and FIGS. 2 and 3 are A of FIG. 1, respectively. -A', sectional view at B-B', 4th
7 to 7 are block diagrams showing an example of the conventional support plate structure for a horizontal tank, and FIGS. 8 and 9 are explanatory diagrams showing the effects of the support plate structure for a horizontal tank according to the present invention, respectively. 10a and 10b are configuration diagrams showing other embodiments of the support plate structure for a horizontal tank according to the present invention, FIG. 10a is a perspective plan view, and FIG.
It is a sectional view at A'. 1...Horizontal tank body, 2...Fixed legs, 3...
Floating leg, 4...Support plate (fixed leg side), 5...
...Support plate (idling leg side), 6...Sole plate, 7...Anchor bolt, 8...Key (support plate sole plate), 9...Key hole (+ shape)
(Fixed leg side), 10... Key hole (- type) (Floating leg side), 12... Bolt (for tensile direction load loading), 1
5...Key (round shape), 16...Key hole (round shape),
11...Bolt hole.

Claims (1)

[Scope of Claims] 1. A horizontal tank includes a fixed leg and a floating leg arranged in parallel in the longitudinal direction, the fixed leg and the floating leg are each connected to a separate support plate, and each of the support plates is attached to a sole. In a horizontal tank support plate structure in which the sole plate is bolted to a plate and the sole plate is fixed to a foundation by an anchor bolt, the fixed leg has a projection having a symmetrical cross-sectional shape approximately in the center of the support plate and the sole plate. the protrusion is loosely fitted into a point-symmetrical hole formed in the support plate while restricting the longitudinal and lateral directions of the horizontal tank, and is joined to the hole formed in the sole plate; The floating leg has a linear protrusion extending along the longitudinal direction of the horizontal tank at approximately the center of the support plate and the sole plate, and the protrusion is inserted into the linear hole formed in the support plate. The horizontal tank is loosely fitted in a transverse direction and joined to the sole plate, and the support plate forms a loose hole and is fixed to the sole plate with bolts in a vertical direction. Features a horizontal tank support plate structure.