Patent Application
20240229463
The present invention relates to a cast-in-place composite shielding shell with ultra-high performance concrete (UHPC), and in particular to a cast-in-place composite shielding shell with ultra-high performance concrete (UHPC), reinforced concrete (RC), and a back anti-crack panel.
In order to deal with the threat of large projectiles, buildings with special protection requirements generally use shielding shells on the surface thereof to protect the main structure thereof. Taking a nuclear power plant as an example, in order to protect a reactor from the effects of external events (impact of a large projectile, tornado, etc.). it is necessary to construct a containment (i.e., a shielding shell) outside the reactor. Common outer shielding shells for a nuclear power plant reactor include: conventional reinforced concrete (RC) shielding shells and steel plate-concrete (SC) shielding walls. the latter of which have been widely used in recent years. In order to achieve the same protective effect, the thickness of the reinforced concrete (RC) shielding shell is relatively large and its construction period is long, while the thickness of the steel plate-concrete (SC) shielding wall is relatively small, its construction is difficult and its cost for construction, operation and maintenance is high.
Therefore, there is a special need for a cast-in-place composite shielding shell with ultra-high performance concrete (UHPC) to solve the above-mentioned existing problems.
The purpose of the present invention is to provide a cast-in-place composite shielding shell with ultra-high performance concrete (UHPC) to address the shortcomings of the prior art by utilizing the excellent performance of UHPC to provide strong impact resistance, reduce wall thickness, and thereby significantly reducing cost and construction difficulty.
The present invention can solve the above technical problems by adopting following technical solutions.
A cast-in-place composite shielding shell with ultra-high performance concrete (UHPC) comprises an UHPC layer, rigid dismantling-free formworks, a RC layer, and a back anti-crack panel. The rigid dismantling-free formworks are disposed between the UHPC layer and the RC layer, and the RC layer is disposed between the UHPC layer and the back anti-crack panel; and the RC layer and the UHPC layer are connected and fixed to each other by means of connectors.
In one embodiment of the present invention, studs are welded to the back anti-crack panel, and the back anti-crack panel is connected to the RC layer through the studs.
In one embodiment of the present invention, the UHPC layer is casted with ultra-high performance concrete and is configured with constructional steel reinforcements.
In one embodiment of the present invention, the RC layer is casted with ordinary concrete and is configured with RC layer main reinforcements and RC layer tension reinforcements.
In one embodiment of the present invention, the rigid dismantling-free formworks are arranged in horizontal and vertical directions with staggered seams.
In one embodiment of the present invention, the rigid dismantling-free formworks are rigid formworks for industrial buildings.
In one embodiment of the present invention, the studs are made of high-strength carbon steel or low alloy steel.
In one embodiment of the present invention, the RC layer main reinforcements, the RC layer tension reinforcements, and the constructional steel reinforcement are hot-rolled ribbed steel reinforcements for industrial buildings, including but not limited to HRB400E steel reinforcements.
In one embodiment of the present invention, the connectors pass through the rigid dismantling-free formworks and are connected with the UHPC layer and the RC layer.
In one embodiment of the present invention, the connectors include but are not limited to tension reinforcements and bolts.
When the cast-in-place composite shielding shell of the present invention is struck by a projectile at a relatively high speed, the UHPC layer, the RC layer, and the back anti-crack panel work together at the impacted site. Compared with the existing technology, the UHPC layer has higher strength and toughness, and is not prone to breakage and splashing under high-speed impact, and the back anti-crack panel prevents the presence of scabs on the back, and can better maintain the overall stress performance of the impacted site, thereby reducing damage to a main structure caused by the impact of a projectile, which achieves the purpose of the present invention.
The features of the present invention can be clearly understood by referring to the drawings of the present invention and the detailed description of the following preferred embodiments.
In order to facilitate understanding the technical means, design features, goals and effects achieved by the present invention, the present invention will be further described below in conjunction with specific illustrations.
As shown in
Studs 5 are welded to the back anti-crack panel 4 for connecting the back anti-crack panel 5 and the RC layer 3. The studs 5 may be made of high-strength carbon steel or low alloy steel.
The UHPC layer 1 is casted with ultra-high performance concrete and is configured with constructional steel reinforcements 8.
The RC layer 3 is casted with ordinary strength concrete and is configured with RC layer main reinforcements 6 and RC layer tension reinforcements 7. The RC layer main reinforcements 6, the RC layer tension reinforcements 7, and the constructional steel reinforcement 8 are implemented by hot-rolled ribbed steel reinforcements for industrial buildings, including but not limited to HRB400E steel reinforcements.
The rigid dismantling-free formworks 2 are arranged in horizontal and vertical directions with staggered seams. Preferably. the rigid dismantling-free formwork 2 is a steel mesh rigid formwork.
Preferably, the back anti-crack panel 4 is an ordinary structural carbon steel plate.
The connectors 9 pass through the rigid dismantling-free formworks 2 and are connected with the UHPC layer 1 and the RC layer 3. Preferably, in order to further enhance the integrity, if the construction conditions are met, the connectors 9 can be further welded to or overlapped on the studs 5 or the back anti-crack panel 4. The connectors 9 include but are not limited to steel reinforcements and bolts, preferably ribbed steel reinforcements or ribbed bolts.
The cast-in-place composite shielding shell of the present invention is mainly used as an outer shielding shell of a nuclear power plant requiring protection against the impact of a large projectile.
In the specific implementation, an UHPC outer temporary formwork is also used. The UHPC outer temporary formwork is arranged outside the UHPC layer 1. The outer temporary formwork is part of construction measures and needs to be removed at a later stage, which is not part of the present invention.
The connection method of this embodiment is as follows: the back anti-crack panel 4 (including the studs 5) is installed in place; the RC layer main reinforcements 6 and the RC layer tension reinforcements 6 are installed; the rigid dismantling-free formworks 2 are installed; the constructional steel reinforcements 8 and the connectors 9 are installed; then the UHPC outer temporary formwork is installed; then the UHPC layer 1 (ultra-high performance concrete) and the RC layer 3 (ordinary concrete) are concreted; and the UHPC outer temporary formwork is finally removed.
In the specific application of this embodiment, the above-mentioned structural form of the present invention is usually used to make a cylindrical or square main shell, and a semi-conical, semi-ellipsoidal or other shaped dome is added thereon according to engineering requirements.
The cast-in-place composite shielding shell of the present invention has the following beneficial effects:
1. Compared with the conventional reinforced concrete (RC) shielding shell, in order to prevent the impact of projectiles, a thickness of the shielding shell of the present invention can be greatly reduced, thus saving the space size of the building and reducing the construction cost.
2. Compared with the conventional steel plate-concrete (SC) shielding shell, the UHPC is used instead of steel plate on the side of the building with protection requirements, which can reduce the difficulty of construction, significantly reduce the overall cost, and greatly reduce the maintenance cost in the operation and maintenance stage (the steel plate in the SC shielding shell needs frequent cleaning and painting maintenance).
3. The damage is usually confined to the UHPC layer and does not affect the main stress reinforcement of the RC layer, so that it is easier to be repaired compared with the traditional RC shielding shell or SC shielding shell.
4. The sizes and contours of the respective components (the UHPC layer, the RC layer and the back anti-crack panel) of the shielding shell can be flexibly adjusted according to the shape and protection requirement of a building, and the engineering application value is extensive. In particular, by adjusting the thickness of each component, the stiffness-density ratio can be flexibly adjusted, and then the response spectrum of the building surface can be flexibly adjusted, which has special significance for the design of nuclear power plants.
5. It is not only suitable for the protection requirements against projectiles outside the building, but also can be used to meet the protection requirements against projectiles inside the building by interchanging the positions of the UHPC and the back panel in the shielding shell.
6. The UHPC layer and the RC layer are separated by the rigid dismantling-free formworks and thus can be concreted alternately at the same time, so as to achieve good integrity.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the essence and scope of the present invention, the present invention will also have various modifications and improvements which fall within the claimed scope of the present invention as defined by the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110161275.3 | Feb 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/113735 | 8/20/2021 | WO |
