Prefabricated fireproof and explosion-proof composite structural board

Abstract

The present invention discloses an assembled fireproof and explosion-proof composite structural board. It adopts an overall structural arrangement in which a front fire-resistant and explosion-proof defense sub-board and a back fire-resistant and explosion-proof defense sub-board clamp an inserted absorption energy explosion-proof and pressure-relief board. A plurality of positive board pressure-relief absorption holes, a plurality of inserted board pressure-relief absorption holes, a plurality of back board pressure-relief absorption holes and a plurality of built-in pressure-relief cavities of the inserted board designed by the present invention are connected and coordinated with each other. The fireproof and explosion-proof enhanced fiber mesh layer and the fireproof buffer damping body arranged in cooperation jointly dissipate the explosion impact energy, can significantly slow down the energy of the explosion impact on the overall structure of the wallboard, avoid the situation where the explosion destruction energy cannot be fully discharged, and enable the present invention to have sufficient strength while having the ability to resist explosion impact and buffer and shock absorption. The present invention can maximize the absorption of explosion impact energy and effectively play the roles of fire prevention and explosion prevention, while ensuring that the assembled fireproof and explosion-proof composite structural board has strength and the ability to absorb the energy generated by the explosion.

Description

Technical Field

[0001] The present invention belongs to the field of explosion-proof engineering, and particularly relates to a prefabricated fire-proof and explosion-proof composite structural board. Background Art

[0002] At the present stage, with the development of the national economy, the prefabrication technology is a policy vigorously advocated by the national government. A large number of prefabricated products are being built or under construction, which also significantly simplifies the installation operation.

[0003] The prefabrication speed is fast, which is conducive to promoting the industrialization process. The construction is simpler, the industrialized disassembly is very convenient, and it is easy to install. Moreover, at the present stage, various flammable and explosive petrochemical products often cause huge casualties and economic losses due to explosions. In order to minimize the losses caused by fires and explosions, it is necessary to develop explosion-proof structures with good explosion-proof effects, especially in military engineering bases such as warehouses, shooting ranges, dormitories, ammunition depots, command posts, garages, hangars, oil depots, equipment rooms, temporary warehouses, bomb disposal sites, field hospitals, and checkpoints, as well as various flammable and explosive petrochemical product processing plants, which often cause huge casualties and economic losses due to explosions. In order to minimize the losses caused by fires and explosions, it is very necessary to build a series of projects such as military safety explosion-proof structures, three-dimensional fortification explosion-proof structures, training base explosion-proof structures, field material warehouse explosion-proof structures, field camp explosion-proof structures, dangerous goods warehouse explosion-proof structures, chemical plant explosion-proof structures, oil refinery explosion-proof structures, firecracker factory explosion-proof structures, storage depot explosion-proof structures, barracks explosion-proof structures, etc. In view of this series of problems, the explosion-proof structure needs to have high crack resistance, strong impact resistance, be able to withstand extremely large impact pressures, have good explosion pressure resistance, extremely strong explosion resistance, high strength, extremely large deformation ability, and good buffering performance, can absorb the energy generated by explosion impacts to the greatest extent, can significantly control the disasters caused by explosions, and can effectively play the roles of fire prevention and explosion protection. Summary of the Invention

[0004] In order to solve the above existing technical problems, the present invention provides a prefabricated fire-proof and explosion-proof composite structural board, which significantly simplifies the installation operation and has a fast prefabrication speed. While ensuring the strength of the prefabricated fire-proof and explosion-proof composite structural board, it has the ability to absorb the energy generated by explosions. It adopts an overall structural setting in which a front resistance flame-retardant defense sub-board and a back resistance flame-retardant defense sub-board clamp a plug-in energy-absorbing explosion-proof pressure relief board, and designs a plurality of front board pressure relief absorption holes, a plurality of plug-in board pressure relief absorption holes, a plurality of back board pressure relief absorption holes, and a plurality of plug-in board built-in pressure relief cavities to communicate and coordinate with each other. The fire-proof and explosion-proof enhanced fiber mesh layer and the fire-proof buffer damping body are cooperatively arranged to jointly dissipate the explosion impact energy, can significantly slow down the energy of the explosion impact on the overall structure of the wallboard, avoid the situation where the explosion damage energy cannot be fully discharged, and enable the present invention to have sufficient strength while having the ability to resist explosion impacts and buffer and shock absorption.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] An assembled fireproof and explosion-proof composite structural board is assembled by a front fire-resistant and explosion-proof defense sub-board, an inserted energy-absorbing explosion-proof pressure-relieving board, and a back fire-resistant and explosion-proof defense sub-board. The front fire-resistant and explosion-proof defense sub-board includes a positive board fire-resistant base layer. On one side of the positive board fire-resistant base layer, a number of positive board inserted middle ribs, positive board inserted side ribs, and positive board inserted reserved openings are provided. Among them, the positive board inserted side ribs are arranged at both ends, and the positive board inserted middle ribs and the positive board inserted reserved openings are alternately arranged between the two positive board inserted side ribs. A number of longitudinal bars are arranged inside the front fire-resistant and explosion-proof defense sub-board, and positive board built-in anchoring connecting bars are arranged to anchor and connect the longitudinal bars. A positive board built-in connecting and interpenetrating board is arranged in the front fire-resistant and explosion-proof defense sub-board. The positive board built-in connecting and interpenetrating board is formed by connecting a positive board built-in board length sub-board and positive board built-in board short sub-boards arranged at both ends thereof. A row of long sub-board through-bar reserved openings is respectively arranged on both sides of the positive board built-in board length sub-board. A number of rows of long sub-board pressure-relieving absorption holes are arranged on the positive board built-in board length sub-board. A row of short sub-board inserted bar reserved openings is arranged on the positive board built-in board short sub-board. The positive board built-in connecting and interpenetrating board is fixedly connected by the positive board built-in board short sub-board and the positive board built-in anchoring connecting bar. A number of rows of through positive board pressure-relieving absorption holes are arranged in the front fire-resistant and explosion-proof defense sub-board. A number of through positive board splicing through-bar vertical reserved holes are respectively arranged on both sides of the front fire-resistant and explosion-proof defense sub-board. A number of vertical installation openings are respectively arranged on both sides of the front fire-resistant and explosion-proof defense sub-board. The vertical installation openings are communicated with the adjacent positive board splicing through-bar vertical reserved holes. A number of through positive board fastening inserted bar horizontal reserved holes are arranged in the positive board inserted middle ribs and the positive board inserted side ribs. A number of horizontal installation openings are respectively arranged on both sides of the front fire-resistant and explosion-proof defense sub-board. The horizontal installation openings are communicated with the adjacent positive board fastening inserted bar horizontal reserved holes. An outer coating is respectively arranged on the front side and both sides of the front fire-resistant and explosion-proof defense sub-board. In the structure of the inserted energy-absorbing explosion-proof pressure-relieving board, inserted board reserved positive side openings are respectively arranged at both ends of the front side of the inserted board base layer. A number of inserted board inserted ribs and inserted board reserved interval openings are alternately arranged between the two inserted board reserved positive side openings. Inserted board reserved back side openings are respectively arranged at both ends of the back side of the inserted board base layer. A number of inserted board inserted ribs and inserted board reserved interval openings are alternately arranged between the two inserted board reserved back side openings. A number of inserted board built-in pressure-relieving cavities and two fire-separating and explosion-proof enhanced fiber mesh layers are arranged in the inserted energy-absorbing explosion-proof pressure-relieving board. Among them, the fire-separating and explosion-proof enhanced fiber mesh layers all pass through each inserted board built-in pressure-relieving cavity. A fireproof buffer damping body is arranged between the two fire-separating and explosion-proof enhanced fiber mesh layers in each inserted board built-in pressure-relieving cavity. A row of inserted board pressure-relieving absorption holes is arranged in each inserted board inserted rib. Among them, the inserted board pressure-relieving absorption holes are communicated with the inserted board built-in pressure-relieving cavity. A number of inserted board fastening inserted bar horizontal reserved holes are arranged in each inserted board inserted rib. A number of inserted board splicing through-bar vertical reserved holes are respectively arranged on both sides of the inserted energy-absorbing explosion-proof pressure-relieving board. An outer coating is applied to the left and right ends of the inserted board base layer. In the structure of the back fire-resistant and explosion-proof defense sub-board,On one side of the backplane resisting the flame-retardant base layer, a number of backplane insertion middle ribs, backplane insertion side ribs, and backplane insertion reserved openings are provided. Among them, the backplane insertion side ribs are arranged at both ends, and the backplane insertion middle ribs and the backplane insertion reserved openings are alternately arranged between the two backplane insertion side ribs. A number of longitudinal ribs are arranged inside the backplane resisting the flame-retardant defense sub-board, and backplane built-in anchoring connecting ribs are arranged to anchor and connect the longitudinal ribs. A backplane built-in connecting and inserting board is arranged in the backplane resisting the flame-retardant defense sub-board. The backplane built-in connecting and inserting board is formed by connecting a backplane built-in long board sub-board and backplane built-in short board sub-boards arranged at both ends thereof. A row of long board through-rib reserved openings is arranged on both sides of the backplane built-in long board sub-board. A number of rows of long board pressure relief and absorption holes are arranged on the backplane built-in long board sub-board. A row of short board inserting-rib reserved openings is arranged on the backplane built-in short board sub-board. The backplane built-in connecting and inserting board is fixedly connected by the backplane built-in short board sub-board and the backplane built-in anchoring connecting ribs. A number of rows of through-backplane pressure relief and absorption holes are arranged in the backplane resisting the flame-retardant defense sub-board. A number of through-backplane splicing through-rib vertical reserved holes are arranged on both sides of the backplane resisting the flame-retardant defense sub-board. A number of vertical installation openings are arranged on both sides of the backplane resisting the flame-retardant defense sub-board. The vertical installation openings are communicated with the adjacent backplane splicing through-rib vertical reserved holes. A number of through-backplane fastening inserting-rib horizontal reserved holes are arranged in the backplane insertion middle ribs and the backplane insertion side ribs. A number of horizontal installation openings are arranged on both sides of the backplane resisting the flame-retardant defense sub-board. The horizontal installation openings are communicated with the adjacent backplane fastening inserting-rib horizontal reserved holes. Outer coating layers are arranged on the back side and both sides of the backplane resisting the flame-retardant defense sub-board. When connecting the front-side flame-retardant defense sub-board and the inserting energy-absorbing explosion-proof pressure relief board, a number of two-board fastening inserting ribs are arranged to pass through the front-board fastening inserting-rib horizontal reserved holes, the inserting-board fastening inserting-rib horizontal reserved holes, and the short board inserting-rib reserved openings, and both ends of the two-board fastening inserting ribs extend into the horizontal installation openings, and at the same time, fixing nuts are used for installation and fastening in the horizontal installation openings. When connecting the inserting energy-absorbing explosion-proof pressure relief board and the backplane resisting the flame-retardant defense sub-board, a number of two-board fastening inserting ribs are arranged to pass through the backplane fastening inserting-rib horizontal reserved holes, the inserting-board fastening inserting-rib horizontal reserved holes, and the short board inserting-rib reserved openings, and both ends of the two-board fastening inserting ribs extend into the horizontal installation openings, and at the same time, fixing nuts are used for installation and fastening in the horizontal installation openings. When connecting the front-side flame-retardant defense sub-board, the inserting energy-absorbing explosion-proof pressure relief board, and the backplane resisting the flame-retardant defense sub-board, a number of three-board splicing through-ribs are arranged to pass through the long board through-rib reserved openings, the front-board splicing through-rib vertical reserved holes, the inserting-board splicing through-rib vertical reserved holes, and the backplane splicing through-rib vertical reserved holes, and both ends of the three-board splicing through-ribs extend into the vertical installation openings, and at the same time, installation screws are used for installation and fastening in the vertical installation openings.,

[0007] Further, after installing the installation screws in the vertical installation openings, mortar is filled, and after installing the fixing nuts in the horizontal installation openings, mortar is filled.

[0008] Furthermore, the dimensions of the reserved openings for the long partition board to pass through the reinforcement bars, the vertical reserved holes for the positive board splicing to pass through the reinforcement bars, the vertical reserved holes for the insertion board splicing to pass through the reinforcement bars, and the vertical reserved holes for the back board splicing to pass through the reinforcement bars are set to be the same and are set according to the cross-sectional diameter of the three-board splicing reinforcement bars; the dimensions of the horizontal reserved holes for the positive board fastening reinforcement bars, the horizontal reserved holes for the insertion board fastening reinforcement bars, and the reserved openings for the short partition board reinforcement bars are set to be the same and are set according to the cross-sectional diameter of the two-board fastening reinforcement bars; the dimensions of the horizontal reserved holes for the back board fastening reinforcement bars, the horizontal reserved holes for the insertion board fastening reinforcement bars, and the reserved openings for the short partition board reinforcement bars are set to be the same and are set according to the cross-sectional diameter of the two-board fastening reinforcement bars.

[0009] Furthermore, the fireproof buffer damping body is made of rock wool; the outer coating is made of styrene-acrylic emulsion.

[0010] Furthermore, the two-board fastening reinforcement bars, the positive board built-in anchoring connection bars, and the back board built-in anchoring connection bars are staggered from each other in the vertical height direction.

[0011] Furthermore, the three-board splicing reinforcement bars, the two-board fastening reinforcement bars, the positive board built-in anchoring connection bars, and the back board built-in anchoring connection bars are staggered from each other in the vertical height direction.

[0012] Furthermore, the fire and explosion isolation and strengthening fiber mesh layer is made of explosion-proof polypropylene fiber, and circular mesh holes are provided thereon, and the mesh hole diameter is set to be 1.5 - 3.5 mm.

[0013] Furthermore, the positive board pressure relief absorption holes and the insertion board pressure relief absorption holes in the insertion board insertion ribs inserted into the positive board insertion reserved openings are correspondingly arranged.

[0014] Furthermore, the back board pressure relief absorption holes and the insertion board pressure relief absorption holes in the insertion board insertion ribs inserted into the back board insertion reserved openings are correspondingly arranged.

[0015] Furthermore, a number of longitudinal bars are provided inside the front fire resistance and flame retardant defense partition board, and positive board built-in anchoring connection bars are provided to anchor and connect the longitudinal bars. A number of longitudinal bars are provided inside the back fire resistance and flame retardant defense partition board, and back board built-in anchoring connection bars are provided to anchor and connect the longitudinal bars. The anchoring connection method is all welding connection. The positive board built-in connection and insertion board are fixedly connected by the positive board built-in short partition board and the positive board built-in anchoring connection bars. The back board built-in connection and insertion board are fixedly connected by the back board built-in short partition board and the back board built-in anchoring connection bars. The fixed connection method is all welding connection.

[0016] The advantages and beneficial effects of the present invention are:

[0017] The present invention relates to an assembled fireproof and explosion-proof composite structural board. It adopts an overall structural arrangement in which a front fire-resistant and explosion-proof defense sub-board and a back fire-resistant and explosion-proof defense sub-board sandwich an inserted energy-absorbing explosion-proof pressure relief board. The front fire-resistant and explosion-proof defense sub-board and the back fire-resistant and explosion-proof defense sub-board are made of high-strength concrete with explosion-proof steel fibers added to form wallboards with high anti-explosion impact strength. The inserted energy-absorbing explosion-proof pressure relief board is made of a mixture of polyvinyl alcohol or polypropylene emulsion and lightweight concrete, making the inserted energy-absorbing explosion-proof pressure relief board a high-damping concrete wallboard with certain damping performance. At the same time, rock wool is used, which has a significant dual role of heat insulation and fire separation, significantly improving the explosion-proof and fireproof performance. Moreover, multiple positive plate pressure relief absorption holes, multiple inserted plate pressure relief absorption holes, multiple back plate pressure relief absorption holes, and multiple inserted plate internal pressure relief cavities designed in the present invention are connected and coordinated with each other. The fireproof and explosion-proof enhanced fiber mesh layer and the fireproof buffer damping body are cooperatively arranged to jointly dissipate the explosion impact energy, significantly reducing the energy of the explosion impact on the overall structure of the wallboard, avoiding the situation where the explosion destruction energy cannot be fully discharged, enabling the present invention to have sufficient strength while having the ability to resist explosion impact and buffer and shock absorption. The present invention significantly simplifies the installation operation and has a fast assembly speed, shortening the construction period. It not only saves project investment but also facilitates industrialized disassembly. At the same time, it increases the construction safety and the structural reliability, can maximize the absorption of explosion impact energy while effectively achieving the fireproof and explosion-proof effects, ensuring that the assembled fireproof and explosion-proof composite structural board has strength while having the ability to absorb the energy generated by the explosion. The overall structure is reasonably stressed and highly efficient in resisting explosion impact, effectively avoiding the situation where local stress increases in the wallboard of the present invention due to explosion, resulting in structural instability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the assembled fireproof and explosion-proof composite structural board in the present invention with reference to the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the assembled fireproof and explosion-proof composite structural board in the present invention.

[0020] Figure 2 It is a front view schematic diagram of the assembled fireproof and explosion-proof composite structural board in the present invention.

[0021] Figure 3 It is a back view schematic diagram of the assembled fireproof and explosion-proof composite structural board in the present invention.

[0022] Figure 4 It is a side view schematic diagram of the assembled fireproof and explosion-proof composite structural board in the present invention.

[0023] Figure 5 It is a schematic diagram of the front fire-resistant and explosion-proof defense sub-board in the assembled fireproof and explosion-proof composite structural board in the present invention.

[0024] Figure 6 It is an elevation view schematic diagram of the front fire-resistant and explosion-proof defense sub-board in the assembled fireproof and explosion-proof composite structural board in the present invention.

[0025] Figure 7 This is a side view schematic diagram of the front resistance flame-retardant and explosion-proof sub-board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0026] Figure 8 This is a top view schematic diagram of the built-in connection and interpenetrating board in the front board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0027] Figure 9 This is an elevation view schematic diagram of the built-in connection and interpenetrating board in the front board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0028] Figure 10 This is a side view schematic diagram of the built-in connection and interpenetrating board in the front board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0029] Figure 11 This is a schematic diagram of the plug-in energy-absorbing explosion-proof and pressure-relieving board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0030] Figure 12 This is an elevation view schematic diagram of the plug-in energy-absorbing explosion-proof and pressure-relieving board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0031] Figure 13 This is a side view schematic diagram of the plug-in energy-absorbing explosion-proof and pressure-relieving board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0032] Figure 14 This is a schematic diagram of the back resistance flame-retardant and explosion-proof sub-board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0033] Figure 15 This is an elevation view schematic diagram of the back resistance flame-retardant and explosion-proof sub-board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0034] Figure 16 This is a side view schematic diagram of the back resistance flame-retardant and explosion-proof sub-board in the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0035] Figure 17 This is a top view schematic diagram of the built-in connection and interpenetrating board in the back board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0036] Figure 18 This is an elevation view schematic diagram of the built-in connection and interpenetrating board in the back board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0037] Figure 19 This is a side view schematic diagram of the built-in connection and interpenetrating board in the back board of the prefabricated fireproof and explosion-proof composite structure board of the present invention.

[0038] Figure 20 This is a splicing schematic diagram of the prefabricated fireproof and explosion-proof composite structure board of the present invention when not assembled.

[0039] In the figure: 1 is the front resistance flame-retardant defense sub-board; 2 is the plug-in energy-absorbing explosion-proof pressure relief board; 3 is the back resistance flame-retardant defense sub-board; 4 is the three-board splicing through-bar; 5 is the installation screw; 6 is the two-board fastening insertion bar; 7 is the fixing nut; 8 is the outer coating; 9 is the vertical installation opening; 10 is the horizontal installation opening; 11 is the vertical reserved hole for the front board splicing through-bar; 12 is the horizontal reserved hole for the front board fastening insertion bar; 13 is the middle rib of the front board plug-in; 14 is the side rib of the front board plug-in; 15 is the reserved opening for the front board plug-in; 16 is the built-in anchoring connection bar of the front board; 17 is the longitudinal bar; 18 is the front board resistance flame-retardant base layer; 19 is the pressure relief absorption hole of the front board; 20 is the built-in connection and interpenetrating board of the front board; 21 is the built-in connection and interpenetrating board of the back board; 22 is the long sub-board of the front board built-in; 23 is the short sub-board of the front board built-in; 24 is the long sub-board of the back board built-in; 25 is the short sub-board of the back board built-in; 26 is the pressure relief absorption hole of the long sub-board; 27 is the reserved hole for the long sub-board through-bar; 28 is the reserved hole for the short sub-board insertion bar; 29 is the base layer of the plug-in board; 30 is the plug-in rib of the plug-in board; 31 is the reserved interval opening of the plug-in board; 32 is the reserved front edge opening of the plug-in board; 33 is the reserved back edge opening of the plug-in board; 34 is the built-in pressure relief cavity of the plug-in board; 35 is the fire-separating and explosion-proof reinforced fiber mesh layer; 36 is the fire-proof buffer damping body; 37 is the pressure relief absorption hole of the plug-in board; 38 is the vertical reserved hole for the plug-in board splicing through-bar; 39 is the horizontal reserved hole for the plug-in board fastening insertion bar; 40 is the back board resistance flame-retardant base layer; 41 is the middle rib of the back board plug-in; 42 is the side rib of the back board plug-in; 43 is the reserved opening for the back board plug-in; 44 is the built-in anchoring connection bar of the back board; 45 is the pressure relief absorption hole of the back board; 46 is the vertical reserved hole for the back board splicing through-bar; 47 is the horizontal reserved hole for the back board fastening insertion bar. Detailed implementation mode

[0040] To further illustrate the present invention, the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0041] Embodiment 1:

[0042] An assembled fireproof and explosion-proof composite structural board of the present invention mainly includes a front fire-resistant and explosion-proof defense sub-board 1, an inserted absorption explosion-proof pressure relief board 2, a back fire-resistant and explosion-proof defense sub-board 3, a three-board splicing reinforcing bar 4, a mounting screw 5, a two-board fastening inserted bar 6, a fixing nut 7, an outer coating 8, a vertical mounting opening 9, a horizontal mounting opening 10, a vertical reserved hole 11 for the front board splicing reinforcing bar, a horizontal reserved hole 12 for the front board fastening inserted bar, a front board inserted middle rib 13, a front board inserted side rib 14, a front board inserted reserved opening 15, a front board built-in anchoring connection bar 16, a longitudinal bar 17, a front board fire-resistant base layer 18, a front board pressure relief absorption hole 19, a front board built-in connection and insertion board 20, a back board built-in connection and insertion board 21, a front board built-in long sub-board 22, a front board built-in short sub-board 23, a back board built-in long sub-board 24, a back board built-in short sub-board 25, a long sub-board pressure relief absorption hole 26, a long sub-board reinforcing bar reserved opening 27, a short sub-board inserted bar reserved opening 28, an inserted board base layer 29, an inserted board inserted rib 30, an inserted board reserved interval opening 31, an inserted board reserved front edge opening 32, an inserted board reserved back edge opening 33, an inserted board built-in pressure relief cavity 34, a fire and explosion isolation and strengthening fiber mesh layer 35, a fireproof buffer damping body 36, an inserted board pressure relief absorption hole 37, a vertical reserved hole 38 for the inserted board splicing reinforcing bar, a horizontal reserved hole 39 for the inserted board fastening inserted bar, a back board fire-resistant base layer 40, a back board inserted middle rib 41, a back board inserted side rib 42, a back board inserted reserved opening 43, a back board built-in anchoring connection bar 44, a back board pressure relief absorption hole 45, a vertical reserved hole 46 for the back board splicing reinforcing bar, and a horizontal reserved hole 47 for the back board fastening inserted bar.

[0043] As Figure 1-4 shown in FIGS. 19 and 20, the assembled fireproof and explosion-proof composite structural board of the present invention is assembled by a front fire-resistant and explosion-proof defense sub-board 1, an inserted absorption explosion-proof pressure relief board 2, and a back fire-resistant and explosion-proof defense sub-board 3. As Figure 5-7 shown in FIG. 21, in the structure of the front fire-resistant and explosion-proof defense sub-board 1, a plurality of front board inserted middle ribs 13, front board inserted side ribs 14, and front board inserted reserved openings 15 are arranged on one side of the front board fire-resistant base layer 18. Among them, the front board inserted side ribs 14 are arranged at both ends, and the front board inserted middle ribs 13 and the front board inserted reserved openings 15 are alternately arranged between the two front board inserted side ribs 14. A plurality of longitudinal bars 17 are arranged inside the front fire-resistant and explosion-proof defense sub-board 1, and the front board built-in anchoring connection bar 16 is arranged to anchor and connect the longitudinal bars 17. The front board built-in connection and insertion board 20 is arranged in the front fire-resistant and explosion-proof defense sub-board 1. As Figure 8-10As shown in the figure, the positive plate built-in connection and interpenetrating plate 20 is formed by connecting the positive plate built-in plate long sub-plate 22 and the positive plate built-in plate short sub-plates 23 provided at both ends thereof. A row of long sub-plate reinforcing bar reserved holes 27 is provided on each side of the positive plate built-in plate long sub-plate 22. A number of rows of long sub-plate pressure relief and absorption holes 26 are provided on the positive plate built-in plate long sub-plate 22. A row of short sub-plate reinforcing bar reserved holes 28 is provided on the positive plate built-in plate short sub-plate 23. The positive plate built-in connection and interpenetrating plate 20 is fixedly connected by the positive plate built-in plate short sub-plate 23 and the positive plate built-in anchoring connection reinforcing bars 16. A number of rows of through positive plate pressure relief and absorption holes 19 are provided in the front resistance flame-retardant and defense sub-plate 1. A number of through positive plate splicing reinforcing bar vertical reserved holes 11 are provided on both sides of the front resistance flame-retardant and defense sub-plate 1 respectively. A number of vertical installation openings 9 are provided on both sides of the front resistance flame-retardant and defense sub-plate 1 respectively. The vertical installation opening 9 is communicated with the adjacent positive plate splicing reinforcing bar vertical reserved hole 11. A number of through positive plate fastening reinforcing bar horizontal reserved holes 12 are provided in the positive plate plug-in middle rib 13 and the positive plate plug-in side rib 14. A number of horizontal installation openings 10 are provided on both sides of the front resistance flame-retardant and defense sub-plate 1 respectively. The horizontal installation opening 10 is communicated with the adjacent positive plate fastening reinforcing bar horizontal reserved hole 12. Outer coating 8 is provided on the front side and both sides of the front resistance flame-retardant and defense sub-plate 1, as Figure 11-13 As shown in the figure, in the structure of the plug-in energy-absorbing explosion-proof pressure relief plate 2, plug-in plate reserved positive edge openings 32 are provided at both ends of the front side of the plug-in plate base layer 29 respectively. A number of plug-in plate plug-in ribs 30 and plug-in plate reserved interval openings 31 are alternately arranged between the two plug-in plate reserved positive edge openings 32. Plug-in plate reserved back edge openings 33 are provided at both ends of the back side of the plug-in plate base layer 29 respectively. A number of plug-in plate plug-in ribs 30 and plug-in plate reserved interval openings 31 are alternately arranged between the two plug-in plate reserved back edge openings 33. A number of plug-in plate built-in pressure relief cavities 34 and two fireproof and explosion-proof enhanced fiber mesh layers 35 are provided in the plug-in energy-absorbing explosion-proof pressure relief plate 2. The fireproof and explosion-proof enhanced fiber mesh layers 35 are all arranged through each plug-in plate built-in pressure relief cavity 34. A fireproof buffer damping body 36 is provided between the two fireproof and explosion-proof enhanced fiber mesh layers 35 in each plug-in plate built-in pressure relief cavity 34. A row of plug-in plate pressure relief and absorption holes 37 is provided in each plug-in plate plug-in rib 30. The plug-in plate pressure relief and absorption hole 37 and the plug-in plate built-in pressure relief cavity 34 are arranged in a through manner. A number of plug-in plate fastening reinforcing bar horizontal reserved holes 39 are provided in each plug-in plate plug-in rib 30. A number of plug-in plate splicing reinforcing bar vertical reserved holes 38 are provided on both sides of the plug-in energy-absorbing explosion-proof pressure relief plate 2 respectively. Outer coating 8 is applied to the left and right ends of the plug-in plate base layer 29. As Figure 14-16As shown, in the structure of the backside fire-resistant and flame-retardant defense sub-board 3, a number of backplane insertion middle ribs 41, backplane insertion side ribs 42, and backplane insertion reserved openings 43 are arranged on one side of the backplane fire-resistant and flame-retardant base layer 40. Among them, the backplane insertion side ribs 42 are arranged at both ends, and the backplane insertion middle ribs 41 and the backplane insertion reserved openings 43 are alternately arranged between the two backplane insertion side ribs 42. A number of longitudinal bars 17 are arranged inside the backside fire-resistant and flame-retardant defense sub-board 3, and backplane built-in anchoring connecting bars 44 are arranged to anchor and connect the longitudinal bars 17. A backplane built-in connecting and inserting plate 21 is arranged in the backside fire-resistant and flame-retardant defense sub-board 3, such as Figure 17-19As shown, the backplane built-in connection and interpenetrating plate 21 is formed by connecting the backplane built-in plate long sub-board 24 and the backplane built-in plate short sub-boards 25 provided at both ends thereof. A row of long sub-board through-rib reserved holes 27 is provided on each side of the backplane built-in plate long sub-board 24. A number of rows of long sub-board pressure relief and absorption holes 26 are provided on the backplane built-in plate long sub-board 24. A row of short sub-board inserting rib reserved holes 28 is provided on the backplane built-in plate short sub-board 25. The backplane built-in connection and interpenetrating plate 21 is fixedly connected by the backplane built-in plate short sub-board 25 and the backplane built-in anchoring connection ribs 44. A number of rows of through backplane pressure relief and absorption holes 45 are provided in the back resistance flame-retardant and defense sub-board 3. A number of through backplane splicing through-rib vertical reserved holes 46 are provided on both sides of the back resistance flame-retardant and defense sub-board 3 respectively. A number of vertical mounting openings 9 are provided on both sides of the back resistance flame-retardant and defense sub-board 3 respectively. The vertical mounting openings 9 communicate with the adjacent backplane splicing through-rib vertical reserved holes 46. A number of through backplane fastening inserting rib horizontal reserved holes 47 are provided in the backplane inserting middle rib 41 and the backplane inserting side rib 42. A number of horizontal mounting openings 10 are provided on both sides of the back resistance flame-retardant and defense sub-board 3 respectively. The horizontal mounting openings 10 communicate with the adjacent backplane fastening inserting rib horizontal reserved holes 47. Outer coating 8 is provided on the back side and both sides of the back resistance flame-retardant and defense sub-board 3. When connecting the front resistance flame-retardant and defense sub-board 1 and the inserting energy-absorbing explosion-proof and pressure-relieving plate 2, a number of two-board fastening inserting ribs 6 are arranged to pass through the front board fastening inserting rib horizontal reserved holes 12, the inserting board fastening inserting rib horizontal reserved holes 39 and the short sub-board inserting rib reserved holes 28, and both ends of the two-board fastening inserting ribs 6 extend out into the horizontal mounting openings 10. At the same time, fixing nuts 7 are installed and fastened in the horizontal mounting openings 10. When connecting the inserting energy-absorbing explosion-proof and pressure-relieving plate 2 and the back resistance flame-retardant and defense sub-board 3, a number of two-board fastening inserting ribs 6 are arranged to pass through the backplane fastening inserting rib horizontal reserved holes 47, the inserting board fastening inserting rib horizontal reserved holes 39 and the short sub-board inserting rib reserved holes 28, and both ends of the two-board fastening inserting ribs 6 extend out into the horizontal mounting openings 10. At the same time, fixing nuts 7 are installed and fastened in the horizontal mounting openings 10. When connecting the front resistance flame-retardant and defense sub-board 1, the inserting energy-absorbing explosion-proof and pressure-relieving plate 2 and the back resistance flame-retardant and defense sub-board 3, a number of three-board splicing through-ribs 4 are arranged to pass through the long sub-board through-rib reserved holes 27, the front board splicing through-rib vertical reserved holes 11, the inserting board splicing through-rib vertical reserved holes 38 and the backplane splicing through-rib vertical reserved holes 46, and both ends of the three-board splicing through-ribs 4 extend out into the vertical mounting openings 9. At the same time, mounting screws 5 are installed and fastened in the vertical mounting openings 9.

[0044] After installing the mounting screws 5 in the vertical mounting openings 9, mortar is filled. After installing the fixing nuts 7 in the horizontal mounting openings 10, mortar is filled.

[0045] The dimensions of the long split board rebar penetration reserved opening 27, the front board splicing rebar vertical reserved hole 11, the inserted board splicing rebar vertical reserved hole 38, and the back board splicing rebar vertical reserved hole 46 are the same and are set according to the cross-sectional diameter of the three-board splicing rebar 4.

[0046] The dimensions of the front board fastening rebar horizontal reserved hole 12, the inserted board fastening rebar horizontal reserved hole 39, and the short split board rebar reserved opening 28 are the same and are set according to the cross-sectional diameter of the two-board fastening rebar 6.

[0047] The dimensions of the back board fastening rebar horizontal reserved hole 47, the inserted board fastening rebar horizontal reserved hole 39, and the short split board rebar reserved opening 28 are the same and are set according to the cross-sectional diameter of the two-board fastening rebar 6.

[0048] The fireproof buffer damping body 36 is made of high-quality rock wool.

[0049] The two-board fastening rebar 6, the front board built-in anchoring connecting rebar 16, and the back board built-in anchoring connecting rebar 44 are staggered with each other in the vertical height direction.

[0050] The three-board splicing rebar 4, the two-board fastening rebar 6, the front board built-in anchoring connecting rebar 16, and the back board built-in anchoring connecting rebar 44 are staggered with each other in the vertical height direction.

[0051] The outer coating 8 is made of styrene-acrylic emulsion.

[0052] The front board insertion middle rib 13, the front board insertion side rib 14, and the front board fire resistance and flame retardant base layer 18 in the front resistance fireproof and flame retardant partition board 1 can be made of high-strength concrete. In this embodiment, the front board insertion middle rib 13, the front board insertion side rib 14, and the front board fire resistance and flame retardant base layer 18 are all made of high-strength concrete added with explosion-proof steel fibers. The weight of the explosion-proof steel fibers is 1-3% of the weight of the high-strength concrete.

[0053] The back board fire resistance and flame retardant base layer 40, the back board insertion middle rib 41, and the back board insertion side rib 42 in the back resistance fireproof and flame retardant partition board 3 can be made of high-strength concrete. In this embodiment, the back board fire resistance and flame retardant base layer 40, the back board insertion middle rib 41, and the back board insertion side rib 42 are all made of high-strength concrete added with explosion-proof steel fibers. The weight of the explosion-proof steel fibers is 1-3% of the weight of the high-strength concrete.

[0054] The inserted board base layer 29 and the inserted board insertion rib 30 in the inserted energy-absorbing explosion-proof pressure relief board 2 can both be made of lightweight concrete. In this embodiment, the inserted board base layer 29 and the inserted board insertion rib 30 are made of lightweight concrete added with polyvinyl alcohol. The weight of the polyvinyl alcohol is 2-5% of the weight of the lightweight concrete.

[0055] The fire-separating and explosion-proof enhanced fiber mesh layer 35 is made of explosion-proof polypropylene fibers, and circular mesh holes are provided thereon, and the mesh hole diameter is set at 1.5 - 3.5 mm.

[0056] The positive plate pressure relief absorption holes 19 in the positive resistance fire-retardant defense sub-board 1 and the plug-in board pressure relief absorption holes 37 in the plug-in board plug ribs 30 inserted into the positive plate plug-in reserved openings 15 are correspondingly arranged.

[0057] The back plate pressure relief absorption holes 45 in the back resistance fire-retardant defense sub-board 3 and the plug-in board pressure relief absorption holes 37 in the plug-in board plug ribs 30 inserted into the back plate plug-in reserved openings 43 are correspondingly arranged.

[0058] A number of longitudinal bars 17 are arranged inside the positive resistance fire-retardant defense sub-board 1, and at the same time, positive plate built-in anchoring connection bars 16 are arranged to anchor and connect the longitudinal bars 17. A number of longitudinal bars 17 are arranged inside the back resistance fire-retardant defense sub-board 3, and at the same time, back plate built-in anchoring connection bars 44 are arranged to anchor and connect the longitudinal bars 17. The anchoring connection methods are all welding connections. The positive plate built-in connection and interpenetrating plate 20 is fixedly connected to the positive plate built-in plate short sub-board 23 and the positive plate built-in anchoring connection bars 16. The back plate built-in connection and interpenetrating plate 21 is fixedly connected to the back plate built-in plate short sub-board 25 and the back plate built-in anchoring connection bars 44. The fixed connection methods are all welding connections.

[0059] Embodiment 2:

[0060] The difference between this embodiment and Embodiment 1 is only that the raw materials for preparing the plug-in board base layer 29 and the plug-in board plug ribs 30 are different.

[0061] In this embodiment, the plug-in board base layer 29 and the plug-in board plug ribs 30 are made of lightweight concrete added with polypropylene emulsion, and the weight of the polypropylene emulsion is 2 - 5% of the weight of the lightweight concrete.

[0062] The rest is the same as Embodiment 1.

[0063] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An assembled fireproof and explosion-proof composite structural board, characterized in that: It is assembled by a front resistance flame-retardant defense sub-board (1), a plug-in energy-absorbing explosion-proof pressure relief board (2), and a back resistance flame-retardant defense sub-board (3). The front resistance flame-retardant defense sub-board (1) includes a front board resistance flame-retardant base layer (18). On one side of the front board resistance flame-retardant base layer (18), a number of front board plug-in middle ribs (13), front board plug-in side ribs (14), and front board plug-in reserved openings (15) are provided. Among them, the front board plug-in side ribs (14) are arranged at both ends, and the front board plug-in middle ribs (13) and the front board plug-in reserved openings (15) are alternately arranged between the two front board plug-in side ribs (14). A number of longitudinal ribs (17) are arranged inside the front resistance flame-retardant defense sub-board (1), and front board built-in anchoring connecting ribs (16) are arranged to anchor and connect the longitudinal ribs (17). The anchoring connection method is welding connection; A front board built-in connection and insertion board (20) is arranged in the front resistance flame-retardant defense sub-board (1). The front board built-in connection and insertion board (20) is formed by connecting a front board built-in board long sub-board (22) and front board built-in board short sub-boards (23) arranged at both ends thereof. A row of long sub-board reinforcing bar reserved openings (27) are respectively arranged on both sides of the front board built-in board long sub-board (22). A number of rows of long sub-board pressure relief absorption holes (26) are arranged on the front board built-in board long sub-board (22). A row of short sub-board reinforcing bar reserved openings (28) are arranged on the front board built-in board short sub-board (23). The front board built-in connection and insertion board (20) is fixedly connected with the front board built-in anchoring connecting rib (16) by using the front board built-in board short sub-board (23). The fixed connection method is welding connection; A number of columns of through positive plate pressure relief absorption holes (19) are provided in the front resistance flame-retardant defense sub-board (1). A number of through positive plate splicing reinforcement vertical reserved holes (11) are respectively provided on both sides of the front resistance flame-retardant defense sub-board (1). A number of vertical installation ports (9) are respectively provided on both sides of the front resistance flame-retardant defense sub-board (1). The vertical installation ports (9) are communicated with the adjacent positive plate splicing reinforcement vertical reserved holes (11). A number of through positive plate fastening reinforcement horizontal reserved holes (12) are provided in the positive plate plug-in middle rib (13) and the positive plate plug-in side rib (14). A number of horizontal installation ports (10) are respectively provided on both sides of the front resistance flame-retardant defense sub-board (1). The horizontal installation ports (10) are communicated with the adjacent positive plate fastening reinforcement horizontal reserved holes (12). Outer coating layers (8) are respectively provided on the front side and both sides of the front resistance flame-retardant defense sub-board (1). In the structure of the plug-in energy absorption explosion-proof pressure relief board (2), plug-in board reserved positive side openings (32) are respectively provided at both ends of the front side of the plug-in board base layer (29). A number of plug-in board plug-in ribs (30) and plug-in board reserved interval openings (31) are alternately arranged between the two plug-in board reserved positive side openings (32). Plug-in board reserved back side openings (33) are respectively provided at both ends of the back side of the plug-in board base layer (29). A number of plug-in board plug-in ribs (30) and plug-in board reserved interval openings (31) are alternately arranged between the two plug-in board reserved back side openings (33). A number of plug-in board built-in pressure relief cavities (34) and two fireproof explosion-proof enhanced fiber mesh layers (35) are provided in the plug-in energy absorption explosion-proof pressure relief board (2). The fireproof explosion-proof enhanced fiber mesh layers (35) are all arranged through each plug-in board built-in pressure relief cavity (34). A fireproof buffer damping body (36) is arranged between the two fireproof explosion-proof enhanced fiber mesh layers (35) in each plug-in board built-in pressure relief cavity (34). A column of plug-in board pressure relief absorption holes (37) is provided in each plug-in board plug-in rib (30). The plug-in board pressure relief absorption holes (37) and the plug-in board built-in pressure relief cavities (34) are arranged in a through manner. A number of plug-in board fastening reinforcement horizontal reserved holes (39) are provided in each plug-in board plug-in rib (30). A number of plug-in board splicing reinforcement vertical reserved holes (38) are respectively provided on both sides of the plug-in energy absorption explosion-proof pressure relief board (2). Outer coating layers (8) are applied to the left and right ends of the plug-in board base layer (29). In the structure of the back resistance flame-retardant defense sub-board (3), a number of back board plug-in middle ribs (41), back board plug-in side ribs (42), and back board plug-in reserved openings (43) are provided on one side of the back board resistance flame-retardant base layer (40). The back board plug-in side ribs (42) are provided at both ends. The back board plug-in middle ribs (41) and the back board plug-in reserved openings (43) are alternately arranged between the two back board plug-in side ribs (42). A number of longitudinal bars (17) are provided inside the back resistance flame-retardant defense sub-board (3), and back board built-in anchoring connecting bars (44) are simultaneously provided to anchor and connect the longitudinal bars (17). The anchoring connection method is welding connection; A backplane built-in connection and insertion board (21) is arranged in the backside resistance flame-retardant defense sub-board (3). The backplane built-in connection and insertion board (21) is formed by connecting a backplane built-in board long sub-board (24) and backplane built-in board short sub-boards (25) arranged at both ends thereof. A row of long sub-board reinforcement insertion reserved holes (27) is arranged on each of the two sides of the backplane built-in board long sub-board (24). A plurality of rows of long sub-board pressure relief absorption holes (26) are arranged on the backplane built-in board long sub-board (24). A row of short sub-board reinforcement insertion reserved holes (28) is arranged on the backplane built-in board short sub-board (25). The backplane built-in connection and insertion board (21) is fixedly connected by using the backplane built-in board short sub-board (25) and a backplane built-in anchoring connection reinforcement (44), and the fixed connection method is welding connection; A number of columns of through backplane pressure relief absorption holes (45) are provided in the backside fire-resistant and flame-retardant defense sub-board (3). A number of through backplane splicing reinforcement vertical reserved holes (46) are respectively provided on both sides of the backside fire-resistant and flame-retardant defense sub-board (3). A number of vertical installation ports (9) are respectively provided on both sides of the backside fire-resistant and flame-retardant defense sub-board (3). The vertical installation ports (9) communicate with the adjacent backplane splicing reinforcement vertical reserved holes (46). A number of through backplane fastening reinforcement horizontal reserved holes (47) are provided in the backplane plug-in middle rib (41) and the backplane plug-in side rib (42). A number of horizontal installation ports (10) are respectively provided on both sides of the backside fire-resistant and flame-retardant defense sub-board (3). The horizontal installation ports (10) communicate with the adjacent backplane fastening reinforcement horizontal reserved holes (47). Outer coating (8) is provided on the backside and both sides of the backside fire-resistant and flame-retardant defense sub-board (3). When connecting the front-side fire-resistant and flame-retardant defense sub-board (1) and the plug-in energy absorption explosion-proof pressure relief board (2), a number of two-board fastening reinforcements (6) are provided to pass through the front-board fastening reinforcement horizontal reserved holes (12), the plug-in board fastening reinforcement horizontal reserved holes (39) and the short sub-board reinforcement reserved openings (28), and the two ends of the two-board fastening reinforcements (6) extend into the horizontal installation ports (10), and at the same time, fixing nuts (7) are used for installation and fastening in the horizontal installation ports (10). When connecting the plug-in energy absorption explosion-proof pressure relief board (2) and the backside fire-resistant and flame-retardant defense sub-board (3), a number of two-board fastening reinforcements (6) are provided to pass through the backplane fastening reinforcement horizontal reserved holes (47), the plug-in board fastening reinforcement horizontal reserved holes (39) and the short sub-board reinforcement reserved openings (28), and the two ends of the two-board fastening reinforcements (6) extend into the horizontal installation ports (10), and at the same time, fixing nuts (7) are used for installation and fastening in the horizontal installation ports (10). When connecting the front-side fire-resistant and flame-retardant defense sub-board (1), the plug-in energy absorption explosion-proof pressure relief board (2) and the backside fire-resistant and flame-retardant defense sub-board (3), a number of three-board splicing reinforcements (4) are provided to pass through the long sub-board reinforcement reserved openings (27), the front-board splicing reinforcement vertical reserved holes (11), the plug-in board splicing reinforcement vertical reserved holes (38), the backplane splicing reinforcement vertical reserved holes (46), and the two ends of the three-board splicing reinforcements (4) extend into the vertical installation ports (9), and at the same time, installation screws (5) are used for installation and fastening in the vertical installation ports (9); After installing the installation screws (5) in the vertical installation ports (9), mortar is used for filling. After installing the fixing nuts (7) in the horizontal installation ports (10), mortar is used for filling.

2. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, characterized in that: The dimensions of the long partition board reinforcing bar passing-through reserved openings (27), the vertical reserved holes for the positive board splicing and reinforcing bar passing-through (11), the vertical reserved holes for the inserted board splicing and reinforcing bar passing-through (38), and the vertical reserved holes for the back board splicing and reinforcing bar passing-through (46) are the same and are set according to the cross-sectional diameter of the three-board splicing reinforcing bar (4); the dimensions of the horizontal reserved holes for the positive board fastening reinforcing bar (12), the horizontal reserved holes for the inserted board fastening reinforcing bar (39), and the short partition board reinforcing bar reserved openings (28) are the same and are set according to the cross-sectional diameter of the two-board fastening reinforcing bar (6); the dimensions of the horizontal reserved holes for the back board fastening reinforcing bar (47), the horizontal reserved holes for the inserted board fastening reinforcing bar (39), and the short partition board reinforcing bar reserved openings (28) are the same and are set according to the cross-sectional diameter of the two-board fastening reinforcing bar (6).

3. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, characterized in that: The fireproof buffer damping body (36) is made of rock wool; the outer coating (8) is made of styrene-acrylic emulsion.

4. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, wherein: The two-board fastening reinforcing bar (6) is staggeredly arranged with the positive board built-in anchoring connecting bar (16) and the back board built-in anchoring connecting bar (44) in the vertical height direction.

5. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, wherein: The fire and explosion isolation and strengthening fiber mesh layer (35) is made of explosion-proof polypropylene fiber, and circular mesh holes are provided thereon, and the mesh hole diameter is set at 1.5 - 3.5 mm.

6. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, wherein: The positive board pressure relief absorption holes (19) and the inserted board pressure relief absorption holes (37) in the inserted board insertion ribs (30) inserted into the positive board insertion reserved openings (15) are correspondingly arranged.

7. The prefabricated fireproof and explosion-proof composite structural board according to claim 1, wherein: The back board pressure relief absorption holes (45) and the inserted board pressure relief absorption holes (37) in the inserted board insertion ribs (30) inserted into the back board insertion reserved openings (43) are correspondingly arranged.

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