CN113027210A

CN113027210A - Cast-in-place ultra-high performance concrete (UHPC) combined shielding shell

Info

Publication number: CN113027210A
Application number: CN202110161275.3A
Authority: CN
Inventors: 程书剑; 郑明光; 李成; 李韶平; 豆燚
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-06-25
Also published as: WO2022166164A1

Abstract

The invention aims to disclose a cast-in-place ultra-high performance concrete (UHPC) combined shielding shell, which comprises a UHPC layer, a rigid disassembly-free template, an RC layer and a back anti-cracking panel, wherein the UHPC layer is arranged on the UHPC layer; the stiff disassembly-free template is arranged between the UHPC layer and the RC layer, and the RC layer is arranged between the UHPC layer and the back anti-cracking panel; the RC layer and the UHPC layer are mutually connected and fixed through a connecting piece; compared with the prior art, the UHPC layer has higher strength and toughness, is not easy to crack and splash under high-speed impact, the back anti-cracking panel avoids the back scab sheet, the whole stress performance of the impacted part can be better kept, the damage of the impact of a flying object to the main body structure is further reduced, and the purpose of the invention is realized.

Description

Cast-in-place ultra-high performance concrete (UHPC) combined shielding shell

Technical Field

The invention relates to a cast-in-place ultra-high performance concrete (UHPC) combined shielding shell, in particular to a cast-in-place ultra-high performance concrete (UHPC) -Reinforced Concrete (RC) -back anti-cracking panel combined shielding shell.

Background

In order to deal with the threat of large flying objects, buildings with special protection requirements generally adopt shielding shells on the surfaces to protect main structures. Taking a nuclear power plant as an example, in order to protect a reactor from external events (large missile impact, tornado, etc.), a containment (i.e., a shielding shell) needs to be arranged outside the reactor. A common nuclear power plant reactor external shielding shell includes: conventional Reinforced Concrete (RC) shield cans and steel-concrete (SC) shield walls used in large-scale applications in recent years. In order to achieve the same protection effect, the Reinforced Concrete (RC) shielding shell has larger thickness and long construction period, while the steel plate-concrete (SC) shielding wall has smaller thickness, but the construction difficulty is large, and the construction and operation and maintenance costs are high.

Therefore, a cast-in-place Ultra High Performance Concrete (UHPC) combined shielding shell is particularly needed to solve the above existing problems.

Disclosure of Invention

The invention aims to provide a cast-in-place ultra-high performance concrete (UHPC) combined shielding shell, aiming at the defects of the prior art, the UHPC has excellent performance, provides strong impact resistance, reduces the wall thickness and greatly reduces the manufacturing cost and the construction difficulty.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

a cast-in-place ultra-high performance concrete (UHPC) combined shielding shell is characterized by comprising a UHPC layer, a rigid disassembly-free template, an RC layer and a back anti-cracking panel; the stiff disassembly-free template is arranged between the UHPC layer and the RC layer, and the RC layer is arranged between the UHPC layer and the back anti-cracking panel; the RC layer and the UHPC layer are mutually connected and fixed through a connecting piece.

In one embodiment of the invention, the back crack-resistant panel is welded with studs, and the back crack-resistant panel is connected with the RC layer through the studs.

In one embodiment of the invention, the UHPC layer is cast of ultra high performance concrete and provided with construction steel.

In one embodiment of the invention, the RC layer is formed by pouring common concrete, and the RC layer is provided with RC layer main ribs and RC layer tie ribs.

In one embodiment of the invention, the stiff non-demolition templates are arranged staggered with respect to each other in horizontal and vertical directions.

In one embodiment of the invention, the stiff disassembly-free formwork is an industrial building stiff formwork.

In one embodiment of the invention, the pegs are machined from high strength carbon steel or low alloy tube.

In one embodiment of the invention, the RC layer main bars, RC layer tie bars and construction steel bars are industrial building hot rolled ribbed steel bars, including but not limited to HRB 400E steel bars.

In one embodiment of the invention, the connector passes through the non-release stiff template and interconnects the UHPC layer and the RC layer.

In one embodiment of the invention, the connectors include, but are not limited to, tie bars and bolts.

If the cast-in-place combined shielding shell is impacted by a high-speed missile, the UHPC layer, the RC layer and the back anti-cracking panel at the impacted part work cooperatively. Compared with the prior art, the UHPC layer has higher strength and toughness, is not easy to crack and splash under high-speed impact, the back anti-cracking panel avoids the back scab sheet, the whole stress performance of the impacted part can be better kept, the damage of the impact of a flying object to the main body structure is further reduced, and the purpose of the invention is realized.

The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.

Drawings

FIG. 1 is a schematic structural view of a cast-in-place combined shielding case of the present invention;

fig. 2 is a schematic view of the section a-a of fig. 1.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Examples

As shown in fig. 1 and 2, the cast-in-place combined shielding shell of the invention comprises a UHPC layer 1, a stiff non-dismantling formwork 2, an RC layer 3 and a back anti-cracking panel 4; the stiff disassembly-free template 2 is arranged between the UHPC layer 1 and the RC layer 3 and is used as a separating strip for cast-in-place of the UHPC layer 1 and the RC layer 3 in construction; the RC layer 3 is arranged between the rigid disassembly-free template 2 and the back anti-cracking panel 4; the RC-layer 3 and the UHPC-layer 1 are connected to each other by means of connectors 9, i.e. civil engineering construction measures.

The stud 5 is welded on the back anti-cracking panel 4 and used for connecting the back anti-cracking panel 5 with the RC layer 3; the stud 5 can be made of high-strength carbon steel or low-alloy steel.

The UHPC layer 1 is formed by pouring ultra-high performance concrete, and the UHPC layer 1 is provided with a constructional steel bar 8.

The RC layer 3 is formed by pouring common strength concrete, and the RC layer 3 is provided with RC layer main ribs 6 and RC layer tie bars 7. The RC layer main bars 6, the RC layer tie bars 7 and the construction steel bars 8 adopt industrial building hot-rolled ribbed steel bars, including but not limited to HRB 400E steel bars.

The stiff disassembly-free formworks 2 are arranged in a staggered manner along the horizontal and vertical directions, and steel wire mesh stiff formworks can be preferably adopted.

The back crack control panel 4 may preferably be a common structural carbon steel plate.

And the connecting piece 9 penetrates through the rigid non-dismantling template 2 to connect the UHPC layer 1 and the RC layer 3. Preferably, in order to further increase the integrity, the connecting piece 9 and the stud 5 or the back anti-cracking panel 4 can be further welded or lapped under the condition that the construction conditions are met; the connectors 9 include, but are not limited to, steel bars and bolts, preferably ribbed steel bars or ribbed bolts.

The cast-in-place combined shielding shell is mainly used for an outer shielding shell of a nuclear power plant with the requirement of resisting impact of large-scale flying objects.

In specific implementation, a UHPC outer temporary template is also used, and the UHPC outer temporary template is arranged on the outer side of the UHPC layer 1. The outer temporary formwork belongs to a construction measure, needs to be dismantled in the later period, and is not part of the invention.

The connection method of the present embodiment is as follows: mounting the back anti-cracking panel 4 (containing the stud 5) in place; installing RC layer main ribs 6 and RC layer tie ribs 7; installing a rigid disassembly-free template 2; installing a constructional steel bar 8 and a connecting piece 9; then installing a UHPC outer side temporary template; respectively pouring a UHPC layer 1 (ultra-high performance concrete) and an RC layer 3 (common concrete); and finally, removing the UHPC outer temporary template.

When the present embodiment is used specifically, the structural form of the present invention is usually used to manufacture a cylindrical or square main housing, and a dome with a half-cone shape, a half-ellipsoid shape or other shapes is added according to engineering requirements.

The cast-in-place combined shielding shell has the following beneficial effects:

1. compared with the traditional Reinforced Concrete (RC) shielding shell, the thickness of the shielding shell can be greatly reduced for preventing the impact of a flying object, the space size of a building is saved, and the construction cost is reduced.

2. Compared with the traditional steel plate-concrete (SC) shielding shell, the UHPC is used for replacing the steel plate on the side with the protection requirement, so that the construction difficulty can be reduced, the total manufacturing cost is obviously reduced, and the maintenance cost is greatly reduced in the operation and maintenance stage (the SC shielding shell steel plate needs to be regularly cleaned and painted for maintenance).

3. The damage is usually limited to the UHPC layer, the main stressed steel bars of the RC layer cannot be influenced, and the repairing is more convenient compared with the traditional RC shielding shell or SC shielding shell.

4. The size and the appearance of each component (UHPC, RC and back anti-cracking panel) of the shielding shell can be flexibly adjusted according to the shape and the protection requirement of a building, and the engineering application value is wide. Particularly, the rigidity-density ratio can be flexibly adjusted by adjusting the thickness of each part, so that the floor reaction spectrum can be flexibly adjusted, and the method has special significance for the design of a nuclear power plant.

5. The shielding shell is suitable for the protection requirement of the flying objects outside the building, and the UHPC and the back plate can be exchanged at the shielding shell, so that the shielding shell can be used for the protection requirement of the flying objects inside the building.

6. The UHPC layer and the RC layer are separated by a rigid disassembly-free template, can be alternately poured at the same time, and have good integrity.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. A cast-in-place ultra-high performance concrete (UHPC) combined shielding shell is characterized by comprising a UHPC layer, a rigid disassembly-free template, an RC layer and a back anti-cracking panel; the stiff disassembly-free template is arranged between the UHPC layer and the RC layer, and the RC layer is arranged between the UHPC layer and the back anti-cracking panel; the RC layer and the UHPC layer are mutually connected and fixed through a connecting piece.

2. The cast-in-place combined shielding shell according to claim 1, wherein a stud is welded on the back anti-cracking panel, and the back anti-cracking panel is connected with the RC layer through the stud.

3. The cast-in-place composite shield shell of claim 1, wherein the UHPC layer is cast of ultra high performance concrete and provided with construction rebar.

4. The cast-in-place combined shielding shell according to claim 1, wherein the RC layer is formed by casting common concrete, and is configured with RC layer main ribs and RC layer tie ribs.

5. The cast-in-place composite shielding shell of claim 1, wherein the stiff non-dismantling templates are arranged staggered with respect to each other in the horizontal and vertical directions.

6. The cast-in-place combined shielding shell of claim 1, wherein the stiff disassembly-free formwork is a stiff formwork of an industrial building.

7. The cast-in-place composite shielding shell of claim 1, wherein the stud is machined from high strength carbon steel or low alloy pipe.

8. The cast-in-place composite shield shell of claim 1, wherein said RC layer main ribs, RC layer tie ribs and construction steel bars are industrial building hot rolled ribbed steel bars, including but not limited to HRB 400E steel bars.

9. The cast-in-place composite shield can of claim 1, wherein the connector passes through the non-demolition stiff form and interconnects the UHPC layer and the RC layer.

10. The cast-in-place composite shielding shell of claim 1, wherein the connectors include, but are not limited to, tie bars and bolts.