FRUSTUM EMBEDDED FABRICATED COMPOSITE PROTECTIVE STRUCTURE

Abstract

A frustum embedded fabricated composite protective structure is provided, including a restraint frame, a back plate, an infill block and a buffer block. The restraint frame is provided with a plurality of mounting holes matching with the shape of the infill block, the restraint frame is arranged on the back plate, the infill block is in a frustum shape. The buffer block and the infill block are installed in the mounting hole of the restraint frame, the buffer block is arranged on the smaller end of the infill block, and the infill block is wedged into the mounting hole of the restraint frame through a wedge surface mating. Because this protective structure is assembled by multiple restraint frames and infill blocks, under the prestress restraint of partition blocks, the damage range after penetration or explosion will be significantly reduced, and it can withstand multiple blows.

Claims

1. A frustum embedded fabricated composite protective structure, comprising a restraint frame, a back plate, an infill block and a buffer block, wherein the restraint frame is arranged on the back plate, the infill block is in a frustum shape, the buffer block is arranged on the smaller end of the infill block, and the restraint frame is provided with a plurality of through holes matching a size of the infill block to form mounting holes, the buffer block and the infill blocks are installed in the mounting holes of the restraint frame, and the infill block is wedged into the mounting hole of the restraint frame through a wedge surface mating, while the buffer block is constrained at a bottom of the mounting hole, and the infill block, the buffer block and the back plate are fastened by fasteners.

2. The frustum embedded fabricated composite protective structure according to claim 1, wherein the restraint frame is formed by connecting a plurality of hoops matching a shape of the infill block, and an inner cavity of each of the plurality of hoops forms the mounting hole.

3. The frustum embedded fabricated composite protective structure according to claim 2, wherein the shape of infill block is a frustum of hexagonal pyramid, a frustum of regular pyramid, a frustum of cone or a frustum of regular twelve pyramid.

4. The frustum embedded fabricated composite protective structure according to claim 2, wherein a cover plate is arranged on an opening side of the restraint frame, the restraint frame is clamped between the back plate and the cover plate; the fasteners comprise bolts and nuts, and at least one bolt hole penetrates through the cover plate, the infill block, the buffer block and the back plate; the cover plate and the back plate fixedly connect the infill block and the buffer block with each other through the bolts and the nuts.

5. The frustum embedded fabricated composite protective structure according to claim 2, wherein the gaps between the hoops are filled with a gap filler.

6. The frustum embedded fabricated composite protective structure according to claim 5, wherein an opening side of the restraint frame is provided with a cover plate, the restraint frame is clamped between the back plate and the cover plate; the fasteners comprise bolts and nuts, and at least one bolt hole penetrates through the cover plate, the gap filler, and the back plate; the cover plate, the gap filler and the back plate are fixedly connected with each other through the bolts and the nuts.

7. The frustum embedded fabricated composite protective structure according to claim 1, wherein the fasteners comprise bolts and nuts, at least one of the bolts is embedded in the infill block, and a corresponding bolt hole is provided to penetrate the buffer block and the back plate, the bolt passes through the bolt hole reserved in the back plate, and the infill block, the buffer block and the back plate are fixedly connected with each other.

8. The frustum embedded fabricated composite protective structure according to claim 2, wherein an opening side of the restraint frame is provided with a cover plate, the restraint frame 2 is clamped between the back plate and the cover plate; the fasteners comprise bolts and nuts, and at least one bolt hole is provided to penetrate edge areas of the cover plate 4 and the back plate 5; the cover plate 4 and the back plate 5 are fixedly connected with each other through the bolts and the nuts, and the cover plate 4 and the infill block 1 are bonded by a binder.

9. The frustum embedded fabricated composite protective structure according to claim 1, wherein the infill block is a single-layer or multi-layer structure, the infill block is composed of one or more materials from ceramics, concrete and glass, and an outer surface of the infill block is wrapped with fiber reinforced polymer or metal plate to form a surface reinforcement layer.

10. The frustum embedded fabricated composite protective structure according to claim 2, wherein inclined angles of the infill block and the hoop matching with the infill block ranges from 0.5° to 10°.

11. The frustum embedded fabricated composite protective structure according to claim 1, wherein a thickness of the infill block decreases from a centre of the restrained frame to a periphery in a parabola or linear form, and a thickness of the buffer block increases correspondingly with the decrease of the thickness of the infill block, so that a total thickness of the infill block and the buffer block in each mounting hole matches a depth of the mounting hole.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is an internal structure assembly diagram of embodiment 1 of the present disclosure.

[0023] FIG. 2 is an external structure diagram of embodiment 1 of the present disclosure.

[0024] FIG. 3 is an internal structure assembly diagram of embodiment 2 of the present disclosure.

[0025] FIG. 4 is an external structure diagram of embodiment 2 of the present disclosure.

[0026] FIG. 5 is an internal structure assembly diagram of embodiment 3 of the present disclosure.

[0027] FIG. 6 is the structural diagram of the restraint frame, the frustum filler and the buffer block in embodiment 3 of the present disclosure.

[0028] FIG. 7 is an internal structure assembly diagram of embodiment 4 of the present disclosure.

[0029] FIG. 8 is an external structure diagram of embodiment 4 of the present disclosure.

[0030] FIG. 9 is an internal structure assembly diagram of embodiment 5 of the present disclosure.

[0031] FIG. 10 is an external structure diagram of embodiment 5 of the present disclosure.

[0032] FIG. 11 is an internal structure assembly diagram of embodiment 6 of the present disclosure.

[0033] FIG. 12 is an external structure diagram of embodiment 6 of the present disclosure.

[0034] FIG. 13 is an internal structure assembly diagram of embodiment 7 of the present disclosure.

[0035] FIG. 14 is an external structure diagram of embodiment 7 of the present disclosure.

[0036] Numbers marked in the figures: 1. infill block; 11. bolt holes; 2. restraint frame; 3. buffer block; 4. cover plate; 5. back plate; 6. bolts; 7. gap filler; 8. bolt anchor; 9. nut.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Several embodiments of the disclosure are described in detail below according to the drawings.

Embodiment 1

[0038] In this embodiment, the infill block 1 is an infill block 1 in the shape of frustum of a hexagonal pyramid. The restraint frame 2 is a honeycomb type restraint frame 2, the honeycomb type restraint frame 2 is composed of multiple hoops in the shape of frustum of a hexagonal pyramid, and the infill block 1 in the shape of frustum of a hexagonal pyramid and the restraint frame 2 constitute the device shown in FIG. 1. The hoop is anchored on the back plate 5 by bolts or connected with the back plate 5 by welding. At the bottom of mounting hole of each hoop, a buffer block 3 made of elastic and buffering materials such as foam aluminum and foam polymer is filled, and then the infill block 1 is pressed into the hoop in the restraint frame 2, and the lateral confining prestress of infill block 1 is controlled by controlling the pressing depth, such that the anti-penetration and anti-explosion performance of infill block 1 is optimized.

[0039] The cover plate 4 is covered on the restraint frame after all infill blocks 1 are pressed into the restraint frame 2. The reserved bolt holes 11 on the back plate 5, the buffer block 3, the infill block 1 and the cover plate 4 are used to combine the components of the back plate 5, the restraint frame 2 and the cover plate 4 into an integral structure through bolts, as shown in FIG. 2. By adjusting the tightness of the bolts, the prestress in the direction perpendicular to the flat top of infill block 1 can be adjusted, so that the three-dimensional prestress can be achieved for infill block 1, and the ballistic and impact resistance of the infill block 1 can be enhanced. When the structure is damaged, it can be quickly disassembled and repaired.

Embodiment 2

[0040] As shown in FIG. 3, the difference between this embodiment and Embodiment 1 lies in that in this embodiment, the infill block 1 is an infill block 1 in the shape of frustum of a cone, and the hoop of the restraint frame 2 is a hoop in the shape of frustum of a cone. When the infill block 1 in the shape of frustum of a cone is assembled, there is a gap between the hoops, so the gap filler 7 should be filled between the hoops. The gap filler 7 may be materials such as concrete, fiber reinforced polymer or foam aluminum and other materials, and the integral structure assembled by the back plate 5, the cover plate 4, the restraint frame 2 and the infill block 1 in the shape of frustum of a cone is shown in FIG. 4.

Embodiment 3

[0041] As shown in FIG. 5 and FIG. 6, this difference between Embodiment 1 and this embodiment lies in that the infill block 1 in this embodiment is an infill block 1 in the shape of frustum of a regular pyramid. In order to fit the side surface of the frustum of a regular pyramid, the hoop is formed by connecting four wedge-shaped side plates with linearly varying thickness or by using equal-thickness side plates placed according to the inclination of the side surface of the frustum of the regular pyramid.

[0042] When this embodiment is applied to a protective door, panel or wall structure, the boundaries around the door, panel or wall structure are generally constrained such that the bending moment of the overall structure of this device generally decreases from the mid-span region to the periphery after being subjected to strong dynamic load such as explosion or penetration. In order to improve material utilization, the thickness of the infill block in this embodiment decreases from the center of the restrained frame to the periphery in a parabola or linear form, or varies according to the magnitude of the bending moment. The thickness of the buffer block increases with the decrease of the thickness of the infill block, so that the total thickness of the infill block and the buffer block in each mounting hole matches the depth of the mounting hole. The buffer block use aluminum foam, honeycomb material, polymer flexible material as cushioning layer to absorb energy such as shock waves and reduce damage to people and objects behind the door, panel or wall. The back plate 5 is welded or bolted to the restraint frame 2. To further increase the protective effect, panel restraint can be added by fastening the back plate 5 and panel with bolts to further apply prestress in the direction of the bolt axis to the infill block 1 to achieve three-dimensional prestress restraint and increase the protective performance.

Embodiment 4

[0043] In this embodiment, the infill block is an infill block 1 in the shape of frustum of a regular dodecagonal pyramid, the restraint frame 2 takes the hoop in the shape of frustum of a regular dodecagonal pyramid as the basic unit, and a plurality of the infill blocks 1 in the shape of frustum of a regular dodecagonal pyramid and the restraint frame 2 are assembled into a hexagonal composite protective structure, as shown in FIG. 7. The hoop is anchored on the back plate 5 by bolts, or connected to the back plate 5 by welding or bonding. Buffer blocks 3 such as foam aluminum and foam polymer are filled at the bottom of the mounting hole of each hoop, and then the infill block 1 is pressed into the hoop in the restraint frame 2. The size of lateral confining prestress of the infill block 1 is controlled by controlling the pressing depth, so that the anti-penetration and anti-explosion performance of infill block 1 is optimal. Concrete, fiber reinforced polymer or foam aluminum and other materials are used as gap filler 7 for filling gaps between the hoops in the shape of frustum of a regular dodecagonal pyramid. The integral structure assembled by the back plate 5, the cover plate 4, the buffer block 3, the restraint frame 2 and the infill block 1 in the shape of frustum of a regular dodecagonal pyramid is shown in FIG. 8. The prestress in the direction perpendicular to the flat top of infill block 1 can be adjusted with the bolt tightness.

Embodiment 5

[0044] As shown in FIG. 9, the difference between this embodiment and Embodiment 1 is that in this embodiment, the overall structure is a hexagonal composite protective structure assembled by a plurality of infill blocks 1 in the shape of frustum of regular hexagonal pyramid and a restraint frame 2. The overall structure is shown in FIG. 10.

Embodiment 6

[0045] As shown in FIG. 11, this embodiment is based on Embodiment 5. The difference between the two is that bolt holes 11 are not set on infill block 1 in the shape of frustum of hexagonal pyramid and the buffer block 3 in this embodiment, and bolt holes are only set at the edges of the cover plate 4 and the back plate 5. The cover plate 4 and the back plate 5 are bonded with the infill block 1 by the binder, and the surrounding of the structure is connected with bolts. The embodiment is applicable to small protective structural members, such as small ceramic composite armor plate. The overall structure is shown in FIG. 12.

Embodiment 7

[0046] As shown in FIG. 13, the difference between this embodiment and Embodiment 5 is that the structure in this embodiment is not provided with a cover plate 4, but is anchored with the back plate 5 by embedded bolt anchor 8 in the infill block 1. The size of lateral confining prestress of infill block 1 is controlled by the fastening degree of embedded bolt anchor 8 and the back plate 5, and the overall structure is shown in FIG. 14. In this embodiment, the outer surface of the infill block 1 can be wrapped with fiber reinforced polymer or provided with metal plate materials for surface reinforcement, so the cover plate 4 may not be provided. In this embodiment, in order to enhance the structural integrity and the controllability of lateral confining prestress, more bolt anchors 8 can be embedded in the infill block 1.

[0047] In the above embodiments 1-5, each infill block 1 only reserves one bolt hole 11. However, in order to enhance the structural integrity and increase the size of the third direction prestress, more bolt holes 11 can be reserved on each infill block 1, or at least one bolt anchor 8 can be embedded in the infill block 1 to connect the back plate 5.

[0048] The shape of the fabricated composite protective structure in the above seven embodiments is not limited to rectangular or hexagonal shapes, such as doors, panels, walls, etc., but also can be assembled into circular shapes, such as missile well covers, or special-shaped shapes. The protective structure panel can also be assembled into cylindrical, spherical and other curved shapes. The shape of the restraint frame 2 and the number of infill blocks 1 are determined according to the actual working conditions. Except for Embodiment 3, the thickness of the infill block 1 in other embodiments can also be reduced parabola or linear from the mid-span region to the periphery according to the possible bending moment distribution.