JPS6319752B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a support shim structure used in a support device for a nuclear reactor vessel, piping, etc.

For example, the method for supporting a pressurized water reactor vessel is
As shown in the figure, the nozzle portion 5 of the reactor vessel 1 is mounted on a reactor vessel support (referred to as a pedestal) 2a of the primary shielding concrete 2 via a support 3. In this case, the support 3 is fixed to a base plate 9 which is stretched over the upper surface of the support base 2a and which is fixed to the primary shielding concrete by studs. FIGS. 2 and 3 are diagrams showing details of a conventional support structure, in which a concave groove 7 is formed in the support 3 parallel to the axis of the nozzle,
This concave groove 7 is configured to receive and support a support pad (supported body) 6, which is integrally cast with the nozzle on the lower surface of the nozzle portion 5. However, for positioning and level adjustment of the reactor vessel 1, a support shim 8 is inserted between the support body 3 and the support pad 6, which is a supported body.

In the conventional support device configured in this way, it is necessary to cut and adjust the plate thickness of the support shim 8 using a surface cutting machine such as a milling machine, so as shown in FIG. 8
c, and a split type side shim 8a, 8b is adopted.

However, although conventional support devices can fully perform the original functions of the support shim, such as adjusting the level and positioning of the reactor vessel and allowing for radial thermal displacement of the reactor vessel due to temperature rise, In the event of a hypothetical accident such as a material loss accident,
Because an excessively large horizontal load acts on the support part and deforms the support, for example, as shown in Figure 4, a force acts in the direction of lifting the side shims, which may cause the side shims to come off the concave grooves of the support. This has been pointed out, and countermeasures are desired.

This invention has been made in view of the above circumstances, and provides a side shim structure configured to prevent the side shims from coming off from the concave grooves of the support body even if an excessive horizontal load is applied to the support portion. The purpose is to

Corresponding to this purpose, the support shim structure having a detachment prevention function of the present invention is configured such that the bottom and both sides of the supported object are slidably supported in the concave groove of the support through the support shim. In the support device, the support shims include one side shim that is placed in contact with both side surfaces of the concave groove of the support body, and one side shim that is placed in contact with the side shim on both sides and a bottom surface of the concave groove. a bottom shim, and a key structure engages the abutting portions of the bottom shim and the side shim, and the key structure is configured to engage the side surface of the bottom shim that abuts the side shim or the side surface of the side shim. One of the parts facing the side surface of the bottom shim is provided with a series of protrusions extending in the longitudinal direction of the shim, and the other part is a groove for receiving the series of protrusions.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment. Note that the same reference numerals are used for parts that are the same as those in the prior art, and description thereof will be omitted.

5 and 6, 3 is a support body, and on the upper surface of the support body 3 there is a support pad 6 which is a supported body.
A concave groove 7 is formed to receive the. Support shims 10 for receiving the support pads 6 in the concave groove 7 for positioning and level adjustment of the reactor vessel (not shown) are provided on both sides of the concave groove 7, that is, 7a and 7b. One side shim 10a and one side shim 10b arranged in contact with each other
, both side surfaces abut against the side shims 10a and 10b, and the bottom surface 7 of the concave groove 7 of the support body 3
and a bottom shim 10c disposed in contact with the bottom shim 10c, and the contact portions 15 between the bottom shim 10c and the side shims 10a and 10b are engaged by a key structure.

In this case, the key structure is the side shim 10a.
A series of protrusions 11a and 11b connected in the longitudinal direction of the bottom shim 10c are provided on the side surface of the bottom shim 10c that abuts the side shims 10b and 10b.
a and 10b, the series of protrusions 11a and 1
forming grooves 12a and 12b for receiving the series of protrusions in a portion facing 1b, or
As shown in FIG. 7, side shims 10a and 10
A series of protrusions 11a and 11b are provided at positions facing the side surfaces of the bottom shim 10c, and grooves 12a and 12b for receiving the series of protrusions 11a and 11b are provided on the side surfaces of the bottom shim 10c opposite to the side shims 10a and 10b. It is done by forming.

Although not shown, the positioning and level adjustment of the reactor vessel is carried out by lifting or jacking up the reactor vessel and adjusting the plate thickness of the support shim 10 inserted between the support body 3 and the support pad 6 (plate The support shim 10 is inserted or pulled out along the concave groove 7 of the support 3. Therefore, after the reactor vessel is in place, the load of the reactor vessel is applied to the bottom shim 10c, so the bottom shim 10c itself will not easily move due to vibrations, etc., but the side shims 10a and 10b are In order to ensure accurate fitting with the bottom shim 10c due to the structure, or to further enhance the restraint of the side shims, a series of partial protrusions as shown in FIG. It is preferable to use the partial protrusion 13 of . In this case, it goes without saying that the opposing support shim of the partial protrusion 13 is formed with a groove 14 corresponding to and receiving the partial protrusion 13 .

The support shim structure is applicable not only to a support device for a reactor vessel but also to a support device in which the bottom and both sides of a supported object, that is, a support pad, is supported in a concave groove of a support body through a support shim. For example, it can be applied to a pipe support device 17 using a portal frame 20 as shown in FIG.

In the support shim structure having a detachment prevention function configured as described above, even if an excessively large load that deforms the support is applied at the support part between the supported object and the support, the key structure prevents the side shim from breaking. Since the movement of the side shims is restrained by the bottom shims, separation of the side shims from the support body can be prevented, and a structurally stable support device can therefore be obtained. Moreover, since the support shim is separated into a side shim and a bottom shim, even if the key structure is used for engagement, adjustment of the thickness of the support shim using a facing machine such as a milling machine is extremely easy as in the conventional case.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram showing the support device for the reactor vessel;
Fig. 2 is a diagram showing details of a conventional support structure, Fig. 3 is a sectional view taken along arrow A-A in Fig. 2, Fig. 4 is a diagram showing a situation where the side shim comes off from the support body, and Figs. FIG. 7 is an explanatory diagram of a support shim structure having a detachment prevention function according to an embodiment of the present invention;
FIG. 8 is a partial explanatory diagram of a support shim structure according to another embodiment, and FIG. 9 is a diagram showing an example of application of the support shim structure of the present invention to a pipe support device. 3... Support body, 6, 16... Support pad (supported body), 7... Concave groove, 10... Support shim structure, 10a, 10b... Side shim, 10c
...Bottom shim, 11a, 11b...Series of protrusions, 12a, 12b, 14...Groove, 13...Partial protrusion, 17...Piping support device, 18...Piping.

Claims (1)

[Claims] 1. In a support device in which the bottom and both sides of the supported body are slidably supported in the concave groove of the support body via support shims, the support shims are provided on both sides of the concave groove of the support body. It is composed of one side shim which is placed in contact with each other, and a bottom shim whose both side surfaces are in contact with the side shim and which are placed in contact with the bottom surface of the concave groove, and the bottom shim and the side shim are in contact with each other. The contact portions are engaged by a key structure, and the key structure is such that either a side surface of the bottom shim that contacts the side shim or a portion of the side shim that faces the side surface of the bottom shim is continuous in the longitudinal direction of the shim. A support shim structure having a detachment prevention function, comprising a series of protrusions, the other of which is a groove for receiving the series of protrusions.