阅读说明：本技术 一种锥台嵌挤装配式复合防护结构 (Frustum inlays crowded assembled composite protection structure ) 是由 孙宇雁 王子国 朱亚光 徐培蓁 王松涛 于 2021-02-25 设计创作，主要内容包括：一种锥台嵌挤装配式复合防护结构,包括约束框架、背板、填充块和缓冲垫块,所述约束框架内设有多个与填充块大小相匹配的通孔构成安装孔,所述约束框架设置在背板上,所述填充块为锥台型,所述缓冲垫块设置在填充块的小端上,所述缓冲垫块和填充块安装在约束框架的安装孔内,并且所述填充块通过锥面配合楔紧在约束框架的安装孔内,同时将所述缓冲垫块约束在安装孔的底部；本装置约束框架由多块填充块拼装而成,在分区块预应力约束下,侵彻或者爆炸作用后的损伤范围将明显减少,可以经受多次打击,而且受损后的填充块容易拆卸更换,修复简便快捷。(A frustum embedding and extruding assembly type composite protection structure comprises a constraint frame, a back plate, a filling block and a buffer cushion block, wherein a plurality of through holes matched with the filling block in size are formed in the constraint frame to form a mounting hole, the constraint frame is arranged on the back plate, the filling block is in a frustum shape, the buffer cushion block is arranged at the small end of the filling block, the buffer cushion block and the filling block are arranged in the mounting hole of the constraint frame, the filling block is wedged tightly in the mounting hole of the constraint frame through conical surface matching, and the buffer cushion block is constrained at the bottom of the mounting hole; the restraint frame of the device is formed by assembling a plurality of filling blocks, under the restraint of block prestress, the damage range after penetration or explosion is obviously reduced, the device can withstand multiple times of striking, the damaged filling blocks are easy to detach and replace, and the repair is simple, convenient and quick.)

1. The utility model provides a frustum inlays crowded compound protective structure of assembled which characterized in that: including restraint frame (2), backplate (5), filling block (1) and cushion block (3), restraint frame (2) set up on backplate (5), filling block (1) is the frustum type, cushion block (3) set up on the tip of filling block (1), be equipped with in restraint frame (2) a plurality ofly and filling block (1) size assorted through-hole formation mounting hole, install in the mounting hole of restraint frame (2) cushion block (3) and filling block (1), and filling block (1) wedge through conical surface cooperation in the mounting hole of restraint frame (2), will simultaneously cushion block (3) restraint is in the bottom of mounting hole.

2. The frustum-embedded assembled composite protective structure of claim 1, wherein: the restraint frame (2) is formed by mutually connecting a plurality of cuffs matched with the filling blocks (1) in shape, and the mounting holes are formed in the inner cavities of the cuffs.

3. The frustum-embedded assembled composite protective structure of claim 2, wherein: the filling block (1) is of a hexagonal frustum shape, a regular quadrangular frustum shape, a conical frustum shape or a regular dodecagonal frustum shape.

4. The frustum-embedded assembled composite protective structure of claim 2, wherein: be provided with apron (4) on the opening side of restraint frame (2), restraint frame (2) press from both sides and be equipped with at least one bolt hole (11) between backplate (5) and apron (4), correspond on apron (4), filling block (1), cushion block (3) and backplate (5), apron (4) and backplate (5) are through bolt (6) with filling block (1), cushion block (3) mutual fixed connection.

5. The frustum-embedded assembled composite protective structure of claim 2, wherein: and a gap filling body (7) is filled in the gap between the hoops.

6. The frustum-embedded assembled composite protective structure of claim 5, wherein: be provided with apron (4) on the opening side of restraint frame (2), restraint frame (2) press from both sides and are equipped with at least one bolt hole (11) between backplate (5) and apron (4), correspond on apron (4), gap obturator (7) and backplate (5), apron (4), gap obturator (7) and backplate (5) are through bolt (6) mutual fixed connection.

7. The frustum-embedded assembled composite protective structure of claim 1, wherein: the bolt anchoring piece (8) is embedded in the filling block (1), and the bolt anchoring piece (8) in the filling block (1) penetrates out of a bolt hole (11) reserved in the back plate (5) and is anchored with the back plate (5).

8. The frustum-embedded assembled composite protective structure of claim 1, wherein: the filling block (1) is of a single-layer or multi-layer structure, the filling block (1) is formed by laminating one or more materials of ceramics, concrete and glass, and the outer surface of the filling block (1) is wrapped by fiber reinforced polymers or metal plates to form a surface reinforcing layer.

9. The frustum-embedded assembled composite protective structure of claim 2, wherein: the size range of the inclination angle of the conical surface between the filling block (1) and the matched hoop is 0.5-10 degrees.

10. The frustum-embedded assembled composite protective structure according to any one of claims 1 to 9, wherein: the thickness of the filling block (1) is reduced in a parabolic manner or linearly reduced from the center of the restraint frame (2) to the periphery, and the thickness of the cushion block (3) is correspondingly increased along with the reduction of the thickness of the filling block (1), so that the total thickness of the filling block (1) and the cushion block (3) in each mounting hole is matched with the depth of the mounting hole.

Technical Field

The invention relates to an embedded and extruded assembly type composite protection structure of a frustum.

Background

In recent years, with weaponsThe continual upgrade and development of equipment, and the severe situation of terrorist explosion attacks, have made more serious challenges to the protective capabilities of armor equipment and protective structures, and have made it a great deal of burden to develop lighter, more effective armor and protective structures. Ceramic material (e.g. Al)₂O₃、B₄C、SiC、TiB₂AlN and the like) has the characteristics of low density, high hardness, high compressive strength and the like, can effectively passivate and abrade the projectile, and can obviously improve the penetration resistance of the armor. Concrete is one of the most widely used civil engineering materials at present, is widely used in military and civil air defense engineering, and is also an extremely important material of nuclear containment. However, ceramic and concrete, which are brittle materials with low toughness and low tensile strength, are prone to integral brittle fracture and collapse under the impact of an elastomer, and penetration resistance is seriously affected. When the ceramic or concrete material bullet-shielding layer structure is restrained by the tough materials (steel pipes, fiber reinforced materials and the like) in blocks, the elasticity resistance of the bullet-shielding layer structure is obviously superior to that of the bullet-shielding layer structure under the unconfined condition, and the smaller the diameter of the basic unit restrained by the blocks is, the better the penetration resistance and the multiple-strike resistance of the bullet-shielding layer structure are. The radial expansion and crack development of the steel are limited under the constraint action, so that the strength and toughness of the steel are greatly improved, and the penetration resistance of the steel is obviously improved.

Research shows that the ceramic material is prestressed on the basis of blocking constraint, and the penetration resistance can be further improved. It was found that the static, dynamic strength and hardness of the ceramic target, constrained by the lateral plates and subjected to biaxial pre-stress (confining pressure), all increased with increasing pre-stress. The prestress applied to the ceramic target can counteract the transient tensile stress of local impact of the projectile, and effectively inhibit the initiation and the propagation of cracks in the target body. Even if the interior of the ceramic is broken or broken under high-speed impact, the broken blocks are tightly extruded and only have cracks without expansion, so that greater penetration resistance exists in the broken ceramic region, and the penetration resistance and the impact resistance of the ceramic are effectively improved. Although the concrete under the prestress constraint condition is rarely researched in penetration resistance, the partitioned prestress constraint effect is also suitable for brittle materials such as concrete, glass and the like.

The block ceramic prestress constraint mainly comprises a mechanical extrusion method and a hot charging method. The mechanical extrusion method is that a lateral plate is pushed in the in-plane direction of a ceramic panel to directly extrude the side surface of the ceramic plate, and transverse prestress is applied to the ceramic; the shrink-fit method is to assemble the ceramic block and the metal constraining ring with poor filling at high temperature, the metal with larger thermal expansion coefficient and faster contraction is compressed into ceramic after the whole body is cooled down to apply prestress, for example, the constrained ceramic-metal composite bulletproof armor plate and the preparation method thereof disclosed in the Chinese patent application with the application number of 201810777211.4. However, the two methods are difficult to apply prestress on the ceramic material, and difficult to perform block prestress constraint on the brittle materials such as concrete, glass and the like with poor heat resistance. The Chinese patent application with the application number of 202010591444.2 discloses a prestress restraint block for a composite armor structure, which is wedged tightly through the matching of a frustum filler and a conical surface of a restraint ring, so that radial prestress can be applied to the filler simply and conveniently, and biaxial prestress can be applied to filling materials such as ceramics, concrete or glass under the room temperature condition. If a third-direction prestress is further applied to the restraint block on the basis of the biaxial prestress, the elasticity resistance of the restraint block can be greatly improved.

At present, prestressed concrete is widely applied to a large-span structure, and common prestressing methods comprise a pretensioning method and a post-tensioning method, wherein both prestressing methods apply prestressing force through the resilience of pretensioned reinforcing steel bars. The pretensioning method is suitable for small and medium-sized members, prestress can be easily applied to small-sized concrete members, confining pressure prestress constraint is difficult to realize on a combined structure of a plurality of small-sized members, and the prestress can not be adjusted for the second time once the prestress is applied. The post-tensioning method is generally used for large-scale components, the prestressed concrete is easy to collapse and splash in a large area under the action of explosion or penetration strong dynamic load, and the prestress can possibly play a role in reaction; when the prestressed reinforcement is applied to small-size components, the prestressed reinforcement is difficult to arrange, even if the prestressed reinforcement is arranged, the prestress loaded by the material cannot be accurately controlled due to the extremely large prestress loss caused by the over-short reinforcement, and the effective prestress is difficult to apply. Except for the pre-tensioning method and the post-tensioning method, the expansion concrete can also generate prestress in the material, the prestress is 0.17-3.45 MPa, but the prestress is smaller, so the expansion concrete is mainly used for shrinkage compensation and self-stress concrete, and is not generally used as a prestress loading mode of a concrete structure. Therefore, the blocking prestress constraint is difficult to realize by adopting the prestress method. At present, doors, plates, walls and other large-scale reinforced concrete or steel plate-concrete structures for protective structures are mostly adopted, and concrete protective structures such as doors, plates, walls and the like with prefabricated partitioned prestressed restraint are not available.

Disclosure of Invention

The invention provides a frustum embedded and extruded assembled composite protection structure, which solves the defects of the prior art and is characterized in that a filling block made of materials such as concrete, ceramic, glass and the like is pressed into a hoop made of metal or fiber reinforced polymer or each grid of hoops of a constraint frame, and the hoops apply bidirectional or three-way prestress on the filling block in a conical surface wedging mode to form a partitioned prestress constraint and assembled composite protection structure.

The invention is realized by adopting the following technical scheme:

the utility model provides a frustum inlays crowded compound protective structure of assembled, includes restraint frame, backplate, filling block and buffering cushion block, be equipped with a plurality ofly in the restraint frame and constitute the mounting hole with filling block size assorted through-hole, the restraint frame sets up on the backplate, the filling block is the frustum type, the buffering cushion block sets up on the tip of filling block, install in the mounting hole of restraint frame buffering cushion block and filling block, and the filling block passes through conical surface cooperation wedging in the mounting hole of restraint frame, will simultaneously buffering cushion block retrains the bottom at the mounting hole.

In this embodiment, the constraining frame is formed by connecting the outer walls of a plurality of cuffs, and the inner cavity of each cuff forms the mounting hole.

In the present embodiment, the filling block is of a hexagonal frustum type, a regular quadrangular frustum type, a truncated cone type, or a regular dodecagonal frustum type. When the filling block is of a hexagonal frustum shape, the constraining frame is formed into a honeycomb shape by a plurality of hexagonal ferrules connected with each other.

In this embodiment, the cover plate is arranged on the opening side of the constraint frame, the constraint frame is clamped between the back plate and the cover plate, at least one bolt hole is correspondingly formed in the cover plate, the filling block, the cushion block and the back plate, and the filling block and the cushion block are fixedly connected with each other through the bolts in the cover plate and the back plate. By adopting the structure, the prestress between the back plate and the filling block and along the direction vertical to the table top of the filling block is adjusted by the tightness of the bolt, and the strength of the filling block is correspondingly increased along with the increase of the prestress.

In the present embodiment, the gap between the ferrules is filled with a gap filler. The gap filling body is made of materials such as concrete or fiber reinforced polymers, and on one hand, the gap filling body can be connected with adjacent cuffs, and on the other hand, the integrity of the restraint frame is improved.

In this embodiment, a cover plate is disposed on an opening side of the constraint frame, the constraint frame is clamped between the back plate and the cover plate, at least one bolt hole is correspondingly disposed on the cover plate, the gap filling body and the back plate, and the cover plate, the gap filling body and the back plate are fixedly connected with each other through bolts.

In this embodiment, a bolt anchoring member is pre-embedded in the filling block, and the bolt anchoring member in the filling block penetrates out of a bolt hole reserved in the back plate and is anchored with the back plate.

In this embodiment, the filling block has a single-layer or multi-layer structure, the filling block is formed by stacking one or more materials of ceramic, concrete and glass, and the outer surface of the filling block is wrapped with a fiber reinforced polymer or a metal plate to form a surface reinforcing layer. Because the frustum of materials such as ceramic, concrete, etc. is pushing into the cuff in-process, the local damage appears in the filling block edge region that contacts with the cuff easily, therefore can pack the fibre reinforced polymer or set up the sheet metal material and carry out the surface reinforcement before the filling block pushes into the cuff on its surface, prevent to push the too big and destroy or appear layering of local stress in-process. At least one bolt is pre-buried in the filling block, and the bolt pre-buried in the filling block penetrates out of the bolt hole reserved in the back plate and is anchored with the cover plate.

In this embodiment, the inclination angle of the inner conical surface of the filling block and the matched ferrule is in the range of 0.5 to 10 degrees, preferably 1 to 4 degrees, where the inclination angle of the conical surface is an included angle between a conical generatrix of the outer side wall of the frustum of the filling block and the inner ring wall of the ferrule and the vertical direction or an included angle between a pyramid crest line of the outer side wall of the frustum and the inner ring wall of the ferrule and the vertical direction.

In this embodiment, the thickness of the filling block decreases in a parabolic manner or linearly decreases from the center of the constraint frame to the periphery, and the thickness of the cushion block increases correspondingly with the decrease of the thickness of the filling block, so that the total thickness of the filling block and the cushion block in each mounting hole matches with the depth of the mounting hole. Through the change of the thickness of the filling block, the filling block in the middle of the whole structure of the device is thicker than the filling blocks around, so that after the structure is subjected to explosion or an out-of-plane forced dynamic loading effect, the bending moment is reduced from a midspan area to the periphery, the cost is saved, and the utilization rate of materials is improved.

The invention has the beneficial effects that:

compared with the prior art, the invention ensures that the hoop constraint filling block has the self-tightening function through the hoop constraint principle, can greatly improve the protection effect when the device is used as a protection structure, presses the filling block into the hoop in the constraint frame, can control the magnitude of confining pressure prestress by controlling the pressing depth during assembly, ensures that the penetration resistance and the explosion resistance of the filling block reach the optimal performance, can adjust the magnitude of the prestress between the back plate and the filling block and along the direction vertical to the table top of the filling block through the tightness of the bolt, correspondingly increases the strength of the filling block along with the increase of the prestress, in the device, the filling block can be made of concrete, ceramic or glass and the like, and the hoop can be made of metal or fiber reinforced polymer, so the hoop can very simply and conveniently apply the prestress to the filling block in the radial direction and the vertical direction under the room temperature condition, therefore, the crack propagation of the filling block can be effectively restrained, the penetration resistance of the whole structure is improved, and the prestressed concrete filling block is suitable for applying prestress to protective members with various sizes; the restraint frame adopts the form that a plurality of cuffs are combined, and when the restraint frame structure is damaged, quick disassembly and repair of the restraint frame can be realized by replacing the cuffs, in addition, because the filling block is frustum-shaped, the outer diameter of the bottom surface of the filling block has larger tolerance with the inner diameter of the cuff mounting hole, larger processing errors can be allowed, compared with other assembly modes, the method is more environment-friendly and easier to realize, and prestress is applied or adjusted more simply and conveniently. The single ferrule pre-stressed restraint packing block has excellent local impact resistance, while the plurality of ferrules combined into the honeycomb restraint frame has excellent integrity and bending resistance, and shows very good overall performance. Because the filling block is pushed into the hoop to form the plate body structures such as a door, a plate, a wall and the like, the confining pressure prestress constraint action can greatly improve the compressive strength of the filling block, correspondingly improve the compressive strength of a pressed area of the plate body, and improve the whole bending strength and bending rigidity of the plate body, so that the structure has more excellent performance of resisting whole effect loads such as explosion impact and the like.

In conclusion, the assembled composite protection structure is formed by assembling the constraint frame and the plurality of filling blocks, the penetration resistance and the explosion resistance of the structure can be improved by the block prestress constraint action, the damage range of penetration or explosion action is reduced to a great extent, and multiple strikes can be endured. Under the condition that only a certain filling block is damaged, other filling blocks do not need to be replaced, and only the damaged filling block needs to be taken out and replaced, so that the cost is saved more than the cost for replacing the whole large-area filling block. And when the filling block is damaged, the filling block can be detached from the large port of the ferrule and taken out, so that the damaged component can be quickly repaired and replaced. In view of the advantages, the invention has wide application prospect in various protection fields such as island and reef protection structures, airplane cave depots, missile well covers, ships, armed helicopters, armored cars, tanks and the like.

Drawings

Fig. 1 is an assembly view of an internal structure of embodiment 1 of the present invention.

Fig. 2 is an external configuration diagram of embodiment 1 of the present invention.

Fig. 3 is an assembly view of the internal structure of embodiment 2 of the present invention.

Fig. 4 is an external configuration diagram of embodiment 2 of the present invention.

Fig. 5 is an assembly view of the internal structure of embodiment 3 of the present invention.

Fig. 6 is a schematic structural diagram of a restraint frame, a frustum filler and a cushion block in embodiment 3 of the present invention.

Fig. 7 is an assembly view of the internal structure of embodiment 4 of the present invention.

Fig. 8 is an external configuration diagram of embodiment 4 of the present invention.

Fig. 9 is an assembly view of the internal structure of embodiment 5 of the present invention.

Fig. 10 is an external configuration diagram of embodiment 5 of the present invention.

Fig. 11 is an assembly view of the internal structure of embodiment 6 of the present invention.

Fig. 12 is an external configuration diagram of embodiment 6 of the present invention.

Fig. 13 is an assembly view of the internal structure of embodiment 7 of the present invention.

Fig. 14 is an external configuration diagram of embodiment 7 of the present invention.

Reference numbers in the figures: 1. filling blocks; 11. bolt holes; 2. a constraint frame; 3. buffering cushion blocks; 4. a cover plate; 5. a back plate; 6. a bolt; 7. a gap filler; 8. and (6) anchoring the bolt.

Detailed Description

Several embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Example 1:

in this embodiment, the filling block 1 is a frustum pyramid shaped filling block 1, the constraint frame 2 is a honeycomb type constraint frame 2, the honeycomb type constraint frame 2 is formed by combining a plurality of frustum pyramid shaped ferrules, and the frustum pyramid shaped filling block 1 and the constraint frame 2 form the device shown in fig. 1. The hoop is anchored on the back plate 5 through a bolt or is connected with the back plate 5 through a welding mode, a cushion pad block 3 made of elastic materials with a buffering function such as foamed aluminum and foamed polymer is filled at the bottom of each hoop mounting hole, then the filling block 1 is pressed into the hoop in the constraint frame 2, and the lateral confining pressure prestress of the filling block 1 is controlled through controlling the pressing depth, so that the penetration resistance and the explosion resistance of the filling block 1 are optimal.

After all the filling blocks 1 are pressed into the constraint frame 2, the cover plate 4 is covered, bolt holes 11 are reserved in the back plate 5, the buffer cushion block 3, the filling blocks 1 and the cover plate 4, and the back plate 5, the constraint frame 2 and the cover plate 4 are combined into an integral structure by bolts, as shown in fig. 2. Through the elasticity regulation of bolt, can adjust the prestressing force of 1 mesa direction of perpendicular filling block to realize three-dimensional prestressing force to filling block 1, increase the bullet resistance and the shock resistance of filling block 1, and after this structure takes place to destroy, can dismantle fast and restore.

Example 2:

as shown in fig. 3, the present embodiment is different from embodiment 1 in that, in the present embodiment, the filling block 1 is a truncated cone type filling block 1, the ferrules of the constraining frame 2 are truncated cone type ferrules, and when the truncated cone type filling block 1 is assembled, gaps exist between the ferrules, so that gap filling bodies 7 are filled between the ferrules, the gap filling bodies 7 are made of concrete, fiber reinforced polymer or foamed aluminum, and the like, and the back plate 5, the cover plate 4, the constraining frame 2, the truncated cone type filling block 1, and other components are assembled into an integral structure as shown in fig. 4.

Example 3:

as shown in fig. 5 and 6, the present embodiment is different from embodiment 1 in that the filling block 1 in the present embodiment is a regular quadrangular frustum pyramid type filling block 1, and in order to fit with a regular quadrangular frustum side, the ferrule is formed by connecting four linearly variable-thickness wedge-shaped cross-section side plates or by connecting side plates of equal thickness after being placed at an inclination angle to the frustum side.

When the device is applied to a protective door, a plate or a wall structure, the peripheral boundary of the door, the plate or the wall structure is generally restricted, so that after the overall structure of the device is subjected to explosion or penetration strong dynamic load, the bending moment of the device is generally reduced from a midspan area to the periphery, in order to improve the utilization rate of materials, the thickness of the filling block of the embodiment is reduced from the center of a restraint frame to the periphery in a parabolic form or linearly reduced or changed according to the bending moment, and the thickness of the buffer cushion block is correspondingly increased along with the reduction of the thickness of the filling block, so that the total thickness of the filling block and the buffer cushion block in each mounting hole is matched with the depth of the mounting hole. The cushion pad adopts foamed aluminum, honeycomb materials and high polymer flexible materials as the cushion pad to absorb energy such as shock waves and the like, and reduces the damage to people and objects behind doors, plates or walls. Backplate 5 and restraint frame 2 welded connection or bolted connection, in order to further increase the protective effect, can increase the panel restraint, through bolt fastening backplate 5 and panel, further exert the prestressing force of bolt axis direction to filling block 1, realize the restraint of three-dimensional prestressing force, increase barrier propterty.

Example 4:

in this embodiment, the filling blocks are regular dodecapyramid type filling blocks 1, the constraint frame 2 uses a regular dodecapyramid type ferrule as a basic unit, and a hexagonal composite protective structure assembled by a plurality of regular dodecapyramid type filling blocks 1 and the constraint frame 2 is shown in fig. 7. The hoop is anchored on the back plate 5 through a bolt and can also be connected with the back plate 5 through welding or bonding, a cushion pad 3 such as foamed aluminum, foamed polymer and the like is filled at the bottom of each hoop mounting hole, then the filling block 1 is pressed into the hoop in the constraint frame 2, and the lateral confining pressure prestress of the filling block 1 is controlled by controlling the pressing depth, so that the penetration resistance and the explosion resistance of the filling block 1 are optimal. The filling gap filling body 7 between the regular dodecapyramid-shaped cuffs is made of concrete, fiber reinforced polymer or foamed aluminum and other materials. The back plate 5, the cover plate 4, the cushion block 3, the restraint frame 2, the regular dodecagonal frustum-shaped filling block 1 and other components are assembled into an integral structure as shown in fig. 8, and prestress perpendicular to the table surface direction of the filling block 1 is adjusted by tightness of bolts.

Example 5:

as shown in fig. 9, the present embodiment is different from embodiment 1 in that, in the present embodiment, the overall structure of the hexagonal composite protective structure assembled by a plurality of regular hexagonal frustum-shaped filling blocks 1 and a constraining frame 2 is as shown in fig. 10.

Example 6:

as shown in fig. 11, this embodiment is based on embodiment 5, except that bolt holes 11 are not provided on the regular hexagonal frustum shaped filler block 1 and the cushion block 3 of this embodiment, and bolt holes are provided only at the edges of the cover plate 4 and the back plate 5, wherein the cover plate 4 and the back plate 5 are adhesively connected with the filler block 1 by using an adhesive, and the structure is connected by using bolts. This embodiment is suitable for small protective structural members such as small ceramic composite armor plates, and the overall structure is shown in fig. 12.

Example 7:

as shown in fig. 13, the present embodiment is different from embodiment 5 in that the structure of the present embodiment is not provided with the cover plate 4, but the embedded bolt anchors 8 are connected with the back plate 5 in the filling block 1 in an anchoring manner, the magnitude of the lateral confining pressure prestress of the filling block 1 is controlled by the fastening degree of the embedded bolt anchors 8 and the back plate 5, and the overall structure is as shown in fig. 14. In this embodiment, the outer surface of the filling block 1 may be covered with fiber reinforced polymer or provided with a metal plate material for surface reinforcement, so that the cover plate 4 may not be provided. In this embodiment, in order to enhance the structural integrity and the controllability of the lateral confining pressure prestress, more bolt anchoring members 8 may be pre-embedded in the filling block 1.

In the above embodiments 1-5, only one bolt hole 11 is reserved in each filling block 1, but in order to enhance the structural integrity and increase the third axial prestress, more bolt holes 11 may be reserved in each filling block 1, or at least one bolt anchor 8 may be pre-embedded in the filling block 1 for connecting the back plate 5.

The shapes of the assembled composite protection structures in the 7 embodiments are not limited to rectangles or hexagons (such as doors, plates, walls and the like), and can be spliced into various shapes such as circles (such as missile well covers and the like) or abnormity, the protection structure panels can also be spliced into curved surface shapes such as cylindrical surfaces, spherical crown surfaces and the like, and the shapes of the constraint frames 2 and the number of the filling blocks 1 are determined according to actual working conditions. In addition to embodiment 3, the thickness of the filling block 1 of other embodiments can also be reduced in a parabolic or linear manner from the mid-span region to the periphery according to the distribution of bending moments which may occur.

The above description is only a few specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the design concept should fall within the scope of infringing the protection scope of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.