CN204282293U - For the tsunami structure of nuclear power plant's intake door - Google Patents

Abstract

The utility model discloses a tsunami prevention structure for a water intake door of a nuclear power plant, which comprises a hollow vertical dike formed by opening a water intake hole at the bottom of a caisson vertical dike, and the permeable vertical dike is arranged at the water intake of the water intake flood prevention structure of the nuclear power plant At the entrance or behind the water intake door, block the invasion path of the tsunami. Compared with the prior art, the anti-tsunami structure of the utility model for the water intake door of the nuclear power plant realizes the effective reduction of the wave amplitude under the premise of satisfying the normal water intake of the nuclear power plant by setting a vertical vertical embankment near the water intake, thereby Safe operation of nuclear power plants is guaranteed.

Description

Anti-tsunami structure for water intake doors in nuclear power plants

technical field

The utility model belongs to the safety field of nuclear power plants. More specifically, the utility model relates to a tsunami-proof structure for a water intake door of a nuclear power plant.

Background technique

On March 11, 2011, the severely destructive earthquake and tsunami caused a serious nuclear accident at the Fukushima Daiichi Nuclear Power Plant in Japan, which made all countries realize that safety should be the first priority in the development of nuclear power. Because some coastal nuclear power plants in my country may be affected by transoceanic tsunamis, especially in the South China Sea, which may generate relatively large tsunami waves, these nuclear power plants must have sufficient anti-tsunami capabilities to ensure safety.

However, the water intake and flood control schemes of many existing nuclear power plants have not considered the impact of large-scale tsunami disasters, and mainly adopt water intake and flood control structures surrounding the harbor basin or water intake and flood control structures along bank dams. These existing water intake and flood control structures all set breakwaters outside the coastline of the front of the nuclear power plant site, and leave a water intake door of appropriate width at a certain position of the breakwater, but do not arrange any cover structure at the water intake door. Such a structure will have a relatively large weakening effect on the waves formed by the wind, but because the wavelength of the tsunami is much larger than that of the waves formed by the wind, the diffraction and climbing capabilities are much stronger, so when extreme ocean storm surges and tsunami disasters occur , the water intake and flood control structures of the above-mentioned nuclear power plants still have relatively large risks, mainly including: 1) In extreme ocean storm surges and tsunami disasters, waves or tsunamis will directly reach the plant area after diffraction and reflection from the water intake door Therefore, revetment structures need to be installed at the front of the factory area for re-protection; 2) Tsunami has a stronger diffraction ability than sea waves, and the wave amplitude weakens less after entering the water intake door. 3) The existing water intake and flood control structure has not considered the tsunami, so the stability against overturning and sliding is insufficient. When the tsunami bypasses the water intake door, its huge force will The rear foundation of the water intake and flood control structure is damaged and the structure fails, causing the tsunami to directly attack the nuclear power plant and causing serious flooding accidents; 4) There is no barrier at the water intake gate. Entering the water intake door by mistake will bring safety hazards to the nuclear power plant.

In view of this, it is necessary to provide a tsunami-proof structure for the water intake door of a nuclear power plant.

Utility model content

The purpose of the utility model is to provide an anti-tsunami structure for the water intake door of the nuclear power plant, so as to ensure the safety of the nuclear power plant when extreme ocean storm surges and tsunami disasters occur.

In order to achieve the purpose of the utility model above, the utility model provides a tsunami-proof structure for the water intake door of a nuclear power plant, which includes a permeable vertical dike formed by opening a water intake hole at the bottom of the caisson vertical dike, and the permeable vertical dike is arranged on At the water intake door or behind the water intake door of the water intake and flood prevention structure of the nuclear power plant, the invasion path of the tsunami is blocked.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the hollow vertical embankment includes a box culvert, a caisson and an upper concrete structure; Properly embedded in the natural seabed, the caisson sits on top of the box culvert and the upper concrete structure sits on top of the caisson to cap the caisson.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the top of the box culvert is lower than the design low water level, and the top of the caisson is higher than the design high water level.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the box culvert is a culvert built with reinforced concrete box-shaped pipe joints, and the water intake hole allows water to pass through and enter the front of the plant area. To meet the water intake requirements of nuclear power plants.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the caisson is a reinforced concrete structure filled with rocks.

As an improvement of the utility model for the tsunami anti-tsunami structure of the water intake door of the nuclear power plant, the upper concrete structure includes a capping structure for capping the caisson, and also includes a wave retaining wall arranged in front of the capping structure.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the shape of the wave retaining wall is an "eagle mouth" structure with a certain radian.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, it also includes a weight block; the back sea side of the box culvert is extended to the back sea side protruding from the caisson, and the weight block is placed on The top of the box culvert, and close to the sea side of the caisson.

As an improvement of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant, the vertical dike is in the shape of a "one", broken line or arc, and is arranged at an angle of 90 degrees to the direction of the tsunami movement.

Compared with the prior art, the anti-tsunami structure of the utility model for the water intake door of the nuclear power plant realizes the effective reduction of the wave amplitude under the premise of satisfying the normal water intake of the nuclear power plant by setting a vertical vertical embankment near the water intake, thereby Safe operation of nuclear power plants is guaranteed.

Description of drawings

The tsunami-proof structure of the utility model for the water intake door of a nuclear power plant and its beneficial effects will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Fig. 1 is a cross-sectional schematic diagram of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant.

Fig. 2 is a prefabricated schematic diagram of the first block method of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant.

Fig. 3 is a prefabricated schematic diagram of the second block method of the utility model for the anti-tsunami structure of the water intake door of the nuclear power plant.

Detailed ways

In order to make the purpose, technical solution and beneficial technical effects of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the utility model, not for limiting the utility model.

Please refer to Fig. 1, the anti-tsunami structure used for the water intake door of the nuclear power plant of the utility model includes a box culvert 10, a caisson 20, a ballast 30 and an upper concrete structure 40. The anti-tsunami structure is arranged in the shape of a "one", broken line or arc at the water intake gate of the water intake and flood prevention structure of the nuclear power plant, and forms an angle of 90 degrees with the direction of the tsunami movement, thereby blocking the path of the tsunami attack. If there are wharves and other facilities in the water intake door that require boats to and fro, they can be arranged behind the wharf and closer to the factory area, as long as the attack path of the tsunami is blocked as much as possible.

The box culvert 10 is a culvert built with reinforced concrete box-shaped pipe joints, which is placed on the foundation stone 52 of the natural seabed surface 50, and the unevenness of the natural seabed surface 50 is filled with presser foot concrete blocks 54; The bottom of the culvert 10 is slightly embedded in the natural seabed surface 50 , and the top is lower than the design low water level 56 . The water intake hole 12 in the box culvert 10 can allow the water flow 14 to enter the front of the plant area through the water intake door, thereby meeting the water intake requirements of the nuclear power plant.

The caisson 20 is a reinforced concrete structure filled with stones 22 and sits on top of the box culvert 10 . The top of the caisson 20 is higher than the design high water level 58 , and the front end (ie, the end facing the outer sea side) is aligned with the front end of the box culvert 10 .

The ballast block 30 is a square made of concrete or large stone materials that are easily obtained locally, and it is placed on the top of the box culvert 10 and is close to the rear end of the caisson 20 (that is, the end facing the sea side), so as to ensure that the box culvert 10 and caisson 20 have sufficient stability when being impacted by tsunami.

The upper concrete structure 40 is a capping structure 42 located on the top of the caisson 20 and capping the caisson 20. The capping structure 42, the front ends of the caisson 20 and the box culvert 10 are all aligned to form a vertical plane. According to actual needs such as tsunami scale and protection requirements, a wave wall 44 can also be provided at the position in front of the capping structure 42 . In order to avoid damage when the tsunami hits, the wave wall 44 also has a reinforced concrete structure, and has a certain bending and shear structural strength; in addition, for the consideration of reducing the tsunami's climbing height and waves, the wave wall 44 is preferably set Formed into a "olecranon" structure with a certain radian.

The utility model is used for the anti-tsunami structure of the water intake door of the nuclear power plant, which is prefabricated on land first. During the prefabrication, different forms of blocks are carried out according to the natural conditions of the nuclear power plant and the convenience of implementation. For example, it can be divided into boxes as shown in Figure 2. 10. The caisson 20, the ballast 30 and the upper concrete structure 40 are divided into four pieces for prefabrication. It is also possible to make the front part of the box culvert 10 together with the caisson 20 into a hollow caisson 20a as shown in FIG. The culvert 10a, the air-permeable caisson 20a, the ballast 30 and the upper concrete structure 40 are prefabricated. After prefabrication, it can be transported by ship to the water intake of the nuclear power plant for placement: if the prefabrication plant is close to the shore, slideway launching can be used for installation; if the prefabrication plant is far away, it can be transported to the implementation site by ship, and if the caisson structure is large Floating towing method can also be used.

It can be seen from the above description that the utility model is used for the anti-tsunami structure of the water intake door of the nuclear power plant. By setting the air-permeable vertical embankment at the water intake, the purpose of blocking the tsunami invasion path under the premise of satisfying the normal water intake of the nuclear power plant is realized, effectively Safe operation of nuclear power plants is guaranteed. Then, the utility model also adds box culvert 10a and concrete ballast 30 at the rear of the vertical dike according to the force and damage characteristics of the tsunami to the hollow vertical dike, thereby ensuring its stability under the action of the tsunami.

Compared with the prior art, the anti-tsunami structure of the utility model for the water intake door of the nuclear power plant has at least the following advantages:

1) The air-permeable vertical embankment formed by setting the water intake hole 12 at the bottom can effectively reduce the wave amplitude on the premise of ensuring the safe water intake of the nuclear power plant, so that the water surface in front of the water intake pump room of the nuclear power plant is stable, and has a favorable impact on the water intake of the nuclear power plant;

2) It can block the tsunami invasion path and reduce the wave amplitude reaching the front of the plant area, thereby ensuring the safe operation of the nuclear power plant;

3) It can optimize the revetment design at the front of the plant area, reduce the increase in the use of the nuclear power plant area caused by the revetment land occupation, and reduce the revetment investment at the same time;

4) It can effectively block floating objects, oil pollution, and ships, and avoid safety problems caused by accidental entry to nuclear power plants;

5) The weight block 30 has the effect of anti-overturning and slipping, and can protect the foundation behind the structure, avoid damage to the vertical dike caused by the impact of the surfing water body, and enhance the stability of the vertical dike.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (9)

1. A tsunami-proof structure for the water intake door of a nuclear power plant, characterized in that: it includes a hollow vertical dike formed by opening a water intake hole at the bottom of the caisson vertical dike, and the hollow vertical dike is arranged at the water intake of the nuclear power plant water intake flood control structure At the entrance or behind the water intake door, block the invasion path of the tsunami. 2. The anti-tsunami structure for the water intake door of a nuclear power plant according to claim 1, characterized in that: the air-permeable vertical embankment comprises a box culvert, a caisson and an upper concrete structure; the box culvert is placed on the natural seabed surface The caissons sit on top of the box culverts and the upper concrete structure sits on top of the caissons and caps the caissons on top of the bedrock and properly embedded in the natural seabed. 3. The anti-tsunami structure for the water intake door of nuclear power plant according to claim 2, characterized in that: the top of the box culvert is lower than the design low water level, and the top of the caisson is higher than the design high water level. 4. The anti-tsunami structure for the water intake door of a nuclear power plant according to claim 2, characterized in that: the box culvert is a culvert built with reinforced concrete box-shaped pipe joints, and the water intake holes allow water to pass through And enter the front of the plant area to meet the water intake requirements of the nuclear power plant. 5. The anti-tsunami structure for a water intake door of a nuclear power plant according to claim 2, wherein the caisson is a reinforced concrete structure filled with rocks. 6. The anti-tsunami structure for the water intake door of a nuclear power plant according to claim 2, characterized in that: the upper concrete structure includes a capping structure for capping the caisson, and also includes a retaining structure arranged in front of the capping structure wave wall. 7. The anti-tsunami structure for the water intake door of a nuclear power plant according to claim 6, characterized in that: the shape of the wave retaining wall is an "eagle mouth" structure with a certain radian. 8. The anti-tsunami structure for the water intake door of a nuclear power plant according to claim 2, characterized in that: it also includes a weight block; the back sea side of the box culvert is extended to protrude from the back sea side of the caisson, The ballast is placed on the top of the box culvert and close to the sea side of the caisson. 9. The anti-tsunami structure for the water intake door of a nuclear power plant according to any one of claims 1 to 8, characterized in that: the hollow vertical embankment is in the shape of a "one", a broken line or an arc, And arranged at a 90-degree angle to the direction of tsunami movement.