Steel-structure modularized integrated building structure system

Abstract

Abstract The present invention relates to a steel-structure modularized integrated building structure system. A steel-structure unit house module includes four vertical columns, two upper crossbeams, two lower crossbeams, two upper longitudinal beams, two lower longitudinal beams, a sub-frame, a supporting rod, a floor slab, an outer wall system, a sidewall system, a ceiling and roof system, and a foundation connecting structure. The vertical column is provided with an upper connecting box and a lower connecting box at the top thereof and the bottom thereof, respectively. The steel-structure unit house modules are assembled laterally and longitudinally to assemble a prefabricated building. With a base positioning pin, the module is rapidly mounted with a foundation, improving construction efficiency. The prefabricated building is sealed with a vertical waterproof cover plate and a lateral waterproof cover plate at the outer side thereof, respectively, significantly improving waterproofing, moisture resistance, and fireproof performances. Abstract 20 26 20 80 15 22 J ul 2 02 6 A b s t r a c t 2 0 2 6 2 0 8 0 1 5 2 2 J u l 2 0 2 6 A b s t r a c t 2 0 2 6 2 0 8 0 1 5 2 2 J u l 2 0 2 6

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese Patent Application No.2026205253315, entitled “STEEL-STRUCTURE MODULARIZED INTEGRATED BUILDING STRUCTURE SYSTEM”, filed on April 18, 2026 (DAS code: EBAE), which is hereby incorporated by reference in its entirety. TECHNICAL FIELD

[0002] The present invention relates to the field of prefabricated building construction technology, and specifically to a steel-structure modularized integrated building structure system. BACKGROUND

[0003] For a modularized integrated building, the fabrication of a steel-structure module, the pouring of a concrete for a floor slab, and the installation of a wall plate and an outer-wall decorative material can all be prefabricated in a factory before being transported to a site for assembly. Such an assembled prefabricated building not only ensures high compressive strength, a safe load-bearing performance, and an environmentally friendly building material and construction process, but also retains the characteristics of a traditional architecture. In particular, the assembled prefabricated building can be rapidly assembled and have high construction efficiency, making it a major trend in the modern construction industry.

[0004] In the prior art, the connection between modularized prefabricated building modules commonly involves drilling numerous bolt holes in a crossbeam and using a large number of bolts. The disadvantage of this connection method is that, due to the arbitrary formation of a bolt hole, it is difficult to align the bolt holes (whether assembled side-by-side or top-to-bottom) of a module during on-site installation, which affects both construction quality and progress. Furthermore, similar problems exist in the connection between a steel-structure unit house module and a concrete 2026208015   22 Jul 2026 foundation.

[0005] Additionally, when the steel-structure unit house modules are assembled laterally or longitudinally, how to effectively address fireproofing and waterproofing issues at an assembled gap remains a challenge. For the steel-structure unit house module provided with a corridor, how to assemble the corridor more quickly is another problem that needs to be resolved.

[0006] In view of this, the inventor of the present invention was dedicated to developing a steel-structure modularized integrated building system and designed a connecting component between building modules to rapidly connect a left-floor module to a right-floor module and connect an upper-floor module to a lower-floor module, which improves installation efficiency, reduces a required connection space, decreases the number of connecting bolts, and lowers a labor cost. Furthermore, a new connection structure for connecting the steel-structure unit house module to a foundation is proposed.

[0007] At the same time, the steel-structure modularized integrated building system can effectively address waterproofing and fireproofing problems at an assembled gap during both the lateral and longitudinal assembly of the steel-structure unit house modules.

[0008] On this basis, the inventor of the present invention also proposed a new design for the convenient and rapid installation of the corridor in the steel-structure unit house module provided with the corridor. SUMMARY

[0009] For the above problems and shortcomings, an objective of the present invention is to provide a steel-structure modularized integrated building system, and a joint connecting device for the rapid assembly of a steel-structure unit house module. With a module positioning pin, a connecting plate, and a module connecting bolt, left and right modules, as well as upper-floor and lower-floor modules are rapidly connected and mounted in place, thereby reducing installation difficulty, improving construction efficiency, and simultaneously saving a connecting space and material. The present invention also provides a connecting structure for rapidly and conveniently 2026208015   22 Jul 2026 connecting the steel-structure unit house module to a concrete foundation. On this basis, a further objective of the present invention is to provide a construction and a device that effectively waterproof and fireproof the lateral and longitudinal assembled gaps of a steel-structure unit house module. On this basis, a further objective of the present invention is to provide a modularized integrated building structure system for conveniently and rapidly mounting a corridor.

[0010] To achieve the above inventive objectives, the technical solution of the present invention is as follows: a steel-structure modularized integrated building structure system includes a plurality of cube-shaped steel-structure unit house modules assembled both laterally and longitudinally. The steel-structure unit house module includes four vertical columns, two upper crossbeams, two lower crossbeams, two upper longitudinal beams, two lower longitudinal beams, a sub-frame, a supporting rod, a floor slab, an outer wall system, a sidewall system, and a ceiling and roof system. The vertical column is provided with an upper connecting box and a lower connecting box at the top thereof and the bottom thereof, respectively. With a module positioning pin, a connecting plate, and a module connecting bolt that cooperates with the upper connecting box and the lower connecting box, the steel-structure unit house modules are assembled laterally and longitudinally to assemble a prefabricated building.

[0011] The upper connecting box includes an upper connecting box bottom plate, an upper connecting box top plate, an upper connecting box back plate, and an upper connecting box side plate. The upper connecting box forms an upper connecting box operational recess at the opening of the outer side thereof. The upper connecting box bottom plate, the upper connecting box top plate, the upper connecting box back plate, and the upper connecting box side plate form a bolted construction cavity. The upper connecting box top plate is provided with an upper positioning pin hole and an upper bolted hole.

[0012] The lower connecting box includes a lower connecting box bottom plate, a lower connecting box top plate, a lower connecting box back plate, and a lower connecting box side plate. The lower connecting box forms a lower connecting box operational recess at the opening of the outer side thereof. The lower connecting box bottom plate, 2026208015   22 Jul 2026 the lower connecting box top plate, the lower connecting box back plate, and the lower connecting box side plate form a bolted construction cavity. The lower connecting box bottom plate is provided with a lower positioning pin hole and a lower bolted hole.

[0013] The connecting plate is one plate body that matches the upper connecting box top plate and the lower connecting box bottom plate. The connecting plate is provided thereon with at least two connecting plate pin holes for cooperating with the upper positioning pin hole and the lower positioning pin hole, as well as at least two connecting plate bolted holes for cooperating with the upper bolted hole and the lower bolted hole.

[0014] The positioning pin is fixed in the upper positioning pin hole at the lower section thereof. The positioning pin extends upwards at the upper section thereof.

[0015] The upper connecting box top plate is connected to an upper port of the vertical column at the inner face thereof far away from the end of the upper connecting box side plate. The upper connecting box bottom plate is connected to the side face of the vertical column at the side face thereof. The upper connecting box back plate is welded to the end of the upper crossbeam at the outer side face thereof. The upper connecting box side plate is welded to the end of the upper longitudinal beam at the outer side face thereof. The upper positioning pin hole is directly opposite to the middle of the upper port of the vertical column.

[0016] The lower connecting box bottom plate is connected to a lower port of the vertical column at the inner side face thereof far away from the end of the lower connecting box side plate. The lower connecting box top plate is connected to the side face of the vertical column at the side face thereof. The lower connecting box back plate is welded to the end of the lower crossbeam at the outer side face thereof. The lower connecting box side plate is welded to the end of the lower longitudinal beam at the outer side face thereof. The lower positioning pin hole is directly opposite to the middle of the lower port of the vertical column.

[0017] When being assembled laterally, the steel-structure unit house modules are laterally connected in a way that the two connecting plate pin holes in the connecting plate cooperate with the module positioning pins on the two steel-structure unit house 2026208015   22 Jul 2026 modules, respectively.

[0018] When being assembled longitudinally, the steel-structure unit house modules are longitudinally connected in a way that the module connecting bolt cooperates with the lower bolted hole of the steel structure unit house module above and a connecting plate bolted hole in the connecting plate cooperates with the upper bolted hole of the steel structure unit house module below.

[0019] Furthermore, the upper connecting box and the lower connecting box are each welded with a high-strength structure steel plate. The upper connecting box top plate and the upper connecting box bottom plate are welded to the vertical column. The lower connecting box bottom plate and the lower connecting box top plate are welded to the vertical column.

[0020] Furthermore, the foundation connecting structure includes base connecting boxes arranged at the four corners of the bottom of a first-floor steel-structure unit house module, an anchor bar pre-embedded in the concrete of a foundation, an embedded plate fixed to the upper part of the anchor bar, a base connecting bottom plate fixed to the upper part of the embedded plate, a spacer plate mounted between the base connecting bottom plate and the base connecting box, a base positioning pin, and a base connecting bolt. The base connecting box includes a base connecting box bottom plate, a base connecting box top plate, a base connecting box back plate, and a base connecting box side plate. The base connecting box forms the base connecting box operational recess at the opening of the outer side thereof. The base connecting box bottom plate, the base connecting box top plate, the base connecting box back plate, and the base connecting box side plate form a construction cavity connected to the base connecting bolt. The base connecting box bottom plate, the spacer plate, and the base connecting bottom plate are provided thereon with the base positioning pin hole and the base connecting bolted hole. Through holes are all formed at the places of a connecting hole of the base connecting bolt and the base positioning pin hole, corresponding to the embedded plate. The base connecting bottom plate is welded to a base connecting nut matching the base connecting bolt and a base positioning pin nut matching the base positioning pin at the lower part thereof. The embedded plate is welded to clearance boxes at the lower part thereof corresponding to the peripheries 2026208015   22 Jul 2026 of the base connecting nut and the base positioning pin nut.

[0021] Furthermore, the opening of a vertical gap between the laterally assembled steel-structure unit house modules is sealed with a vertical waterproof cover plate. The vertical waterproof cover plate includes an inner sealing plate and an outer cover plate. The inner sealing plate includes a sealing plate body, and latching plates arranged at the two ends of the back of the sealing plate body. The latching plate is provided with a latching hook at the inner side thereof. Wall plates at the two sides of the sealing plate body, corresponding to a gap between the two assembled steel-structure unit house modules, are provided with through holes of two rows of screws. The inner sealing plate is fixed at the opening of the vertical gap between the laterally assembled steel-structure unit house modules via the screw. A waterproof glue is injected into the head of the screw. A first sealant is injected into two side gaps where the inner sealing plate contacts the wall plate. The outer cover plate includes a fixing plate body, and a hook plate arranged at the back of the fixing plate body. The hook plate is provided with a clamping hook that cooperates with the latching hook. The latching hook is sealed and covered by the outer cover plate by cooperation between the clamping hook and the latching hook. The fixing plate body is provided with a sealing edge plate bent toward the back thereof at the two sides thereof. A second sealant is injected into a gap between the sealing edge plate and the wall plate.

[0022] Furthermore, the opening of a lateral gap between the longitudinally assembled steel-structure unit house modules is sealed with a lateral waterproof cover plate. The lateral waterproof cover plate includes a composite plate made by compounding a galvanized sheet iron, a calcium silicate plate, and an aluminum profile sheet. The lateral waterproof cover plate is fastened to the wall plate at an outer facade at the assembled place of the steel-structure unit house module above and the steel-structure unit house module below with the screw at the upper and lower ends thereof, respectively. A third sealant is injected into a contact place between the upper and lower edges of the lateral waterproof cover plate and the wall plate of the steel-structure unit house module.

[0023] Furthermore, the gap between the laterally assembled steel-structure module units is further filled with a fireproof and waterproof material. The fireproof and 2026208015   22 Jul 2026 waterproof material includes an aluminum foil-faced rock wool, a fireproof glue, and a fourth sealant that are filled from inside out.

[0024] Furthermore, the vertical column is provided with a corridor connecting structure at one side thereof. The corridor connecting structure includes a corridor plate supporting rod. The corridor plate supporting rod is provided thereon with a bolted hole for connecting a prefabricated corridor floor. The prefabricated corridor floor is prefabricated with the concrete and provided with a bolted countersink at a place corresponding to the bolted hole of the corridor plate supporting rod. The corridor plate supporting rod includes two parallelly arranged supporting U-shaped steels and two L-shaped steel plates. One panel of the two L-shaped steel plates is fixed to the outer side of adjacent laterally assembled vertical columns, and the other panel of the L-shaped steel plate is arranged vertically. The two supporting U-shaped steels are fixedly connected to a vertical panel of the L-shaped steel plate by the bolt, respectively. The bolted hole is formed at an upper lateral panel of the supporting U-shaped steel.

[0025] Furthermore, the supporting rod includes a longitudinal supporting rod and a diagonal supporting rod that are connected to the upper crossbeam and the lower crossbeam. The sub-frame includes a side vertical rod positioned near one vertical column and connected to the upper longitudinal beam and the lower longitudinal beam, a middle longitudinal rod connected to the side vertical rod and the other vertical column, and a middle vertical rod connected to the middle longitudinal rod and the lower longitudinal beam.

[0026] Furthermore, the upper positioning pin hole includes a through hole formed in the upper connecting box top plate and a positioning pin nut pre-welded to the inner side of the upper connecting box top plate. The positioning pin is provided with an outer thread that matches an inner thread of the positioning pin nut at the lower section thereof. The positioning pin is provided with a conical face at the upper section thereof.

[0027] Furthermore, the outer wall system consists of a fireproof plate, a rock wool, a calcium silicate plate, and an aluminum decorative outer wall plate that are mounted sequentially on a keel from inside out. The sidewall system consists of the fireproof 2026208015   22 Jul 2026 plate, the rock wool, and the calcium silicate plate that are mounted sequentially on the keel from inside out. The ceiling and roof system consists of the fireproof plate, the rock wool, and a waterproof steel foil that are mounted sequentially on the keel from inside out.

[0028] After the upper and lower connecting boxes of the present invention are connected to the vertical column, the upper and lower connecting boxes and the vertical column form a five-sided enclosure with an opening on an outward-facing side. The opening serves as an installation recess for connecting the bolt, thereby facilitating operation. The upper and lower connecting boxes are manufactured from a high-strength structure steel to withstand high local stress at a connecting joint.

[0029] Compared to the prior art, The present invention has the following advantages: 1. The upper and lower connecting boxes are arranged. Conical positioning pins are mounted at the four corners of the lower-floor module. When being mounted, the upper-floor module is positioned and imported so that the upper-floor module is mounted in place rapidly, precisely positioned and smoothly imported, significantly reducing installation difficulty and improving construction efficiency. After being mounted, the module positioning pin can function as a shear key, sharing the horizontal load of the module connecting bolt and increasing structure safety margin. The upper and lower connecting boxes are welded at the beam-column joint of a modularized building, requiring no additional space and thus saving both space and material. 2. The base connecting boxes are arranged at the four corners of the bottom of the first-floor steel-structure unit house module and tightly locked and connected by the cooperation between the base connecting bolt and the base connecting nut, enabling quick installation and improving construction efficiency. The base connecting box is positioned with the base positioning pin. Once installation is complete, the base positioning pin also functions as the shear key to share the lateral load of the base connecting bolt, increasing the structure safety margin. 3. The lateral assembled gap and the longitudinally assembled gap are filled with the fireproof and waterproof material, and then sealed at the outer side thereof with the vertical waterproof cover plate and the lateral waterproof cover plate, 2026208015   22 Jul 2026 respectively. For the vertical waterproof cover plate, the inner sealing plate cooperates with the outer cover plate. The lateral waterproof cover plate is a composite plate made by compounding a galvanized sheet iron, a calcium silicate plate, and an aluminum profile sheet. All sealing gaps of the vertical waterproof cover plate and the lateral waterproof cover plate are sealed with the sealant, significantly enhancing waterproof, moisture resistance, and fireproof performances. 4. A corridor connecting structure is arranged. The L-shaped steel plate and the supporting U-shaped steel are arranged on the vertical column at one side of the corridor, and then a prefabricated corridor floor is directly bolted to the supporting U-shaped steel so that the corridor can be quickly and conveniently mounted, improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG.1 is a structural schematic diagram of a steel-structure unit house module of the present invention.

[0031] FIG.2 is a structural schematic diagram of an upper connecting box of a steel-structure modularized integrated building structure system of the present invention.

[0032] FIG.3 is a structural schematic diagram of a lower connecting box of a steel-structure modularized integrated building structure system of the present invention.

[0033] FIG.4 is a structural schematic diagram of a positioning pin of a steel-structure modularized integrated building structure system of the present invention.

[0034] FIG.5 is a partial structural schematic diagram of a concrete floor slab integrally cast at the bottom of a steel-structure unit house module of the present invention.

[0035] FIG.6 is a schematic diagram of a steel-structure unit house module and a foundation connecting structure in one embodiment of the present invention.

[0036] FIG.7 is a schematic diagram of two steel-structure unit house modules and a foundation connecting structure in another embodiment of the present invention.

[0037] FIG.8 is a structural schematic diagram of a vertical waterproof cover plate of a 2026208015   22 Jul 2026 steel-structure modularized integrated building structure system of the present invention.

[0038] FIG.9 is a structural schematic diagram in which an opening of a vertical gap between laterally assembled steel-structure unit house module of the present invention is sealed with a vertical waterproof cover plate.

[0039] FIG.10 is a structural schematic diagram in which an opening of a lateral gap between longitudinally assembled steel-structure unit house module of the present invention is sealed with a lateral waterproof cover plate.

[0040] FIG.11 is a structural schematic diagram when a module positioning pin is mounted during the lateral assembly of a steel-structure unit house module of the present invention.

[0041] FIG.12 is a structural schematic diagram when a connecting plate is prepared to be mounted during the lateral assembly of a steel structure unit house module of the present invention.

[0042] FIG.13 is a structural schematic diagram of one embodiment of the present invention during the longitudinal assembly of one steel-structure unit house module.

[0043] FIG.14 is a structural schematic diagram of one embodiment of the present invention during the longitudinal assembly of a second steel-structure unit house module.

[0044] FIG.15 is a structural schematic diagram of another embodiment of the present invention when one steel-structure unit house module is longitudinally assembled with a vertical column with a corridor connecting structure.

[0045] FIG.16 is a structural schematic diagram of another embodiment of the present invention when a second steel-structure unit house module is longitudinally assembled with a vertical column with a corridor connecting structure.

[0046] FIG.17 is a structural schematic diagram of a steel-structure modularized integrated building structure system of the present invention when a supporting U-shaped steel is mounted.

[0047] FIG.18 is a structural schematic diagram of a steel-structure modularized integrated building structure system of the present invention when a prefabricated corridor floor is mounted. 2026208015   22 Jul 2026

[0048] FIG.19 is a structural schematic diagram of a steel-structure modularized integrated building structure system of the present invention after a prefabricated corridor floor is mounted.

[0049] FIG.20 is a schematic diagram (I) showing the process of hoisting a steel-structure unit house module of a steel-structure modularized integrated building structure system of the present invention.

[0050] FIG.21 is a schematic diagram (II) showing the process of hoisting a steel-structure unit house module of a steel-structure modularized integrated building structure system of the present invention.

[0051] FIG.22 is a schematic diagram (III) showing the process of hoisting a steel-structure unit house module of a steel-structure modularized integrated building structure system of the present invention.

[0052] FIG.23 is a sectional structural schematic diagram of an outer wall system of a steel-structure modularized integrated building structure system of the present invention.

[0053] FIG.24 is a sectional structural schematic diagram of a sidewall system of a steel-structure modularized integrated building structure system of the present invention.

[0054] FIG.25 is a structural schematic diagram of a ceiling and roof system structure of a steel-structure modularized integrated building structure system of the present invention.

[0055] The description of reference signs: 1-Vertical column; 10-Upper connecting box; 11-Upper connecting box bottom plate; 12-Upper connecting box top plate; 13-Upper connecting box back plate; 14-Upper connecting box side plate; 15-Upper connecting box operational recess; 16-Upper positioning pin hole; 161-Positioning pin nut; 17-Upper bolted hole; 18-Module connecting bolt; 20-Lower connecting box; 21-Lower connecting box bottom plate; 22-Lower connecting box top plate; 23-Lower connecting box back plate; 24-Lower connecting box side plate; 25-Lower connecting box operation recess; 26-Lower locating pin hole; 27-Lower bolted hole; 31-Upper crossbeam;  32-Lower crossbeam; 321-Concrete stud; 33-Upper longitudinal beam; 34-Lower longitudinal beam; 35-Floor slab; 361-longitudinal 2026208015   22 Jul 2026 supporting rod; 362-Diagonal supporting rod; 371-Side vertical rod; 372-Middle longitudinal rod; 373-Middle vertical rod; 38-Aluminum decorative outer wall plate; 4-Module positioning pin; 40-Outer thread; 41-Conical face; 42-Supporting U-shaped steel; 43-L-shaped steel plate; 44-Bolted hole; 45-Bolted countersink; 46-Prefabricated corridor floor; 47-Stop pin hole; 5-Inner sealing plate; 6-Outer cover plate; 51-Sealing plate body; 52-Latching plate; 53-Latching hook; 54-Screw; 55-First sealant; 6-Outer cover plate; 61-Fixing plate body; 62-Hook plate; 63-Clamping hook; 64-Sealing side plate; 65-Second sealant; 71-Galvanized sheet iron; 72-Calcium silicate plate; 73-Aluminum profile sheet; 74-Third sealant; 75-Aluminum foil-faced rock wool; 76-Fireproof glue; 77-Fourth sealant; 8-Connecting plate; 81-Connecting plate pin hole; 82-Connecting plate bolted hole; 90-Base connecting box; 91-Embedded plate; 92-Anchor bar; 93-Base connecting bottom plate; 94-Spacer plate; 95-Base positioning pin; 96-Base connecting bolt; 901-Base connecting box bottom plate; 902-Base connecting box top plate; 903-Base connecting box back plate; 904-Base connecting box side plate; 96-Base connecting bolt; 97-Base connecting nut; 98-Base positioning pin nut; 99-Clearance box. DETAILED DESCRIPTION OF EMBODIMENTS

[0056] The present invention will be described in detail below with reference to FIGS 1-25.

[0057] Embodiment:

[0058] During the specific implementation, as shown in FIGS 1-4 and FIGS 11-14, The present invention relates to a steel-structure modularized integrated steel building structure system, including a plurality of cube-shaped steel-structure unit house modules assembled both laterally and longitudinally. The steel-structure unit house module includes four vertical columns 1, two upper crossbeams 31, two lower crossbeams 32, two upper longitudinal beams 33, two lower longitudinal beams 34, a sub-frame, a supporting rod, a floor slab 35, an outer wall system, a sidewall system, and a ceiling and roof system. The vertical column 1 is provided with an upper connecting box 10 and a lower connecting box 20 at the top thereof and the bottom thereof, respectively. With a module positioning pin 4, a connecting plate 8, and a 2026208015   22 Jul 2026 module connecting bolt 18 that cooperates with the upper connecting box 10 and the lower connecting box 20, the steel-structure unit house modules are assembled laterally and longitudinally to assemble a prefabricated building. The upper connecting box 10 includes an upper connecting box bottom plate 11, an upper connecting box top plate 12, an upper connecting box back plate 13, and an upper connecting box side plate 14. The upper connecting box forms an upper connecting box operational recess 15 at the opening of the outer side thereof. The upper connecting box bottom plate 11, the upper connecting box top plate 12, the upper connecting box back plate 13, and the upper connecting box side plate 14 form a bolted construction cavity. The upper connecting box top plate 12 is provided thereon with an upper positioning pin hole 16 and an upper bolted hole 17. The upper connecting box top plate 12 has a length greater than that of the upper connecting box bottom plate 11. The lower connecting box 20 includes a lower connecting box bottom plate 21, a lower connecting box top plate 22, a lower connecting box back plate 23, and a lower connecting box side plate 24. The lower connecting box forms a lower connecting box operational recess 25. The lower connecting box bottom plate 21, the lower connecting box top plate 22, the lower connecting box back plate 23, and the lower connecting box side plate 24 form a bolted construction cavity. The lower connecting box bottom plate 24 is provided thereon with a lower positioning pin hole 26 and a lower bolted hole 27. The lower connecting box bottom plate 21 has a length greater than that of the lower connecting box top plate 22.

[0059] The upper connecting box top plate 12 is welded to an upper port of the vertical column 1 at the inner face thereof far away from the end of the upper connecting box side plate 14. The upper connecting box bottom plate 11 is welded to the side face of the vertical column 1 at the side face thereof. The upper connecting box back plate 13 is welded to the end of the upper crossbeam at the outer side face thereof. The upper connecting box side plate 14 is welded to the end of the upper longitudinal beam 33 at the outer side face thereof. The upper positioning pin hole 16 is directly opposite to the middle of the upper port of the vertical column 1.

[0060] The lower connecting box bottom plate 21 is welded to a lower port of the vertical column 1 at the inner side face thereof far away from the end of the lower 2026208015   22 Jul 2026 connecting box side plate 24. The lower connecting box top plate 22 is welded to the side face of the vertical column 1 at the side face thereof. The lower connecting box back plate 23 is welded to the end of the lower crossbeam 32 at the outer side face thereof. The lower connecting box side plate 24 is welded to the end of the lower longitudinal beam 34 at the outer side face thereof. The lower positioning pin hole 26 is directly opposite to the middle of the lower port of the vertical column 1.

[0061] In the embodiment, the upper connecting box 10 and the lower connecting box 20 are each welded with a high-strength structure steel plate. The upper connecting box top plate 12 and the upper connecting box bottom plate 11 are welded to the vertical column 1. The lower connecting box bottom plate 21 and the lower connecting box top plate 22 are welded to the vertical column 1.

[0062] In the embodiment, as shown in FIGS 6 and 7, a foundation connecting structure includes base connecting boxes 90 arranged at four corners of a bottom of a first-floor steel-structure unit house module, an anchor bar 92 pre-embedded in the concrete of a foundation, an embedded plate 91 fixed to an upper part of the anchor bar 92, a base connecting bottom plate 93 fixed to an upper part of the embedded plate 91, a spacer plate 94 mounted between the base connecting bottom plate 93 and the base connecting box 90, a base positioning pin 95, and a base connecting bolt 96. The base connecting box 90 includes a base connecting box bottom plate 901, a base connecting box top plate 902, a base connecting box back plate 903, and a base connecting box side plate 904. The base connecting box 90 forms a base connecting box operational recess at the opening of the outer side thereof. The base connecting box bottom plate 901, the base connecting box top plate 902, the base connecting box back plate 903, and the base connecting box side plate 904 form a construction cavity connected to the base connecting bolt 96. The base connecting box bottom plate 901, the spacer plate 94, and the base connecting bottom plate 93 are provided thereon with the base positioning pin hole and the base connecting bolted hole. Through holes are all formed at the places of a connecting hole of the base connecting bolt and the base positioning pin hole, corresponding to the embedded plate 91. The base connecting bottom plate 93 is welded to a base connecting nut 97 matching the base connecting bolt and a base positioning pin nut 98 matching the base positioning pin at 2026208015   22 Jul 2026 the lower part thereof. The embedded plate 91 is welded to clearance boxes at the lower part thereof corresponding to the peripheries of the base connecting nut 97 and the base positioning pin nut 98.

[0063] In the embodiment, the connecting plate 8 is one plate body that matches the upper connecting box top plate 12 and the lower connecting box bottom plate 22. The connecting plate 8 is provided thereon with two connecting plate pin holes 81 for cooperating with the upper positioning pin hole 16 and the lower positioning pin hole 26, as well as two connecting plate bolted holes 16 for cooperating with the upper bolted hole 17 and the lower bolted hole 27. The positioning pin 4 is fixed in the upper positioning pin hole 16 at the lower section thereof. The positioning pin 4 extends upwards at the upper section thereof.

[0064] In the embodiment, the upper positioning pin hole 16 includes a through hole formed in the upper connecting box top plate 12 and a positioning pin nut 161 pre-welded to the inner side of the upper connecting box top plate 12. The module positioning pin 4 is provided with an outer thread 40 that matches an inner thread of the positioning pin nut 161 at the lower section thereof. The module positioning pin 4 is provided with a conical face 41 at the upper section thereof. During installation, the module positioning pin 4 passes through the through hole arranged in the upper connecting box top plate 12, is screwed into the positioning pin nut 161 and fixed via the outer thread 40 arranged at the lower section thereof. As another embodiment, an internal thread matching the outer thread 40 of the module positioning pin 4 may be directly tapped into the upper connecting box top plate 12. The module positioning pin 4 is be directly fixed to the upper connecting box top plate 12 without the need that a nut is pre-welded.

[0065] In the embodiment, the module positioning pin 4 is provided with a conical face 41 at the upper section thereof so that the connecting plate pin hole 81 in the connecting plate 8 is rapidly aligned with the module positioning pin 4. Furthermore, the lower positioning pin hole 26 in the lower connecting box bottom plate 24 of the steel structure modular unit above is also rapidly aligned and lowered during hoisting. In some embodiments, a stop pin hole 47 passing through the module positioning pin 4 can be formed at the base of the conical face 41. 2026208015   22 Jul 2026

[0066] As shown in FIG.5, a floor-supporting crossbeam is arranged between the two lower crossbeams 32. The two lower crossbeams 32 are pre-mounted with a plurality of concrete studs 321. The two lower crossbeams 32, the two lower longitudinal beams 34, and the floor-supporting crossbeam are integrally combined into a concrete floor slab 35 by pouring the concrete.

[0067] In the embodiment, the upper connecting box 10 and the lower connecting box 20 are welded to the top and bottom of the vertical column 1, respectively.

[0068] In the embodiment, the four vertical columns 1, the two upper crossbeams 31, the two lower crossbeams 32, the two upper longitudinal beams 33, and the two lower longitudinal beams 34 are made of a high-strength structure square steel tube. Due to the high local stress at a connecting joint, the upper connecting box 10 and the lower connecting box 20 are welded and made of a high-strength structure steel plate. The module positioning pin 4 is machined from a high-strength structure steel into a cone with an M36 screw thread at the bottom of the cone. The module connecting bolt 18 can be a high-strength bolt with an appropriate diameter based on the load conditions of a project.

[0069] As another embodiment, the upper connecting box 10, the lower connecting box 20 and the vertical column 1 can be integrally made through a mould and thermal machining.

[0070] In the embodiment, the supporting rod includes a longitudinal supporting rod 361 and a diagonal supporting rod 362 that are connected to the upper crossbeam 31 and the lower crossbeam 32. The sub-frame includes a side vertical rod 371 positioned near one vertical column 1 and connected to the upper longitudinal beam 33 and the lower longitudinal beam 34, a middle longitudinal rod 372 connected to the side vertical rod 371 and the other vertical column 1, and a middle vertical rod 373 connected to the middle longitudinal rod 372 and the lower longitudinal beam 34.

[0071] In the embodiment, when being assembled laterally, the steel-structure unit house modules are laterally connected in a way that the two connecting plate pin holes 81 in the connecting plate 8 cooperate with the module positioning pins 4 on the two steel-structure unit house modules, respectively.

[0072] In the embodiment, when being assembled longitudinally, the steel-structure unit 2026208015   22 Jul 2026 house modules are longitudinally connected in a way that the module connecting bolt 18 cooperates with the lower bolted hole 27 of the steel structure unit house module above and a connecting plate bolted hole 82 in the connecting plate 8 cooperates with the upper bolted hole 17 of the steel structure unit house module below.

[0073] As shown in FIGS 8 and 9, the opening of a vertical gap between the laterally assembled steel-structure unit house modules is sealed with a vertical waterproof cover plate. The vertical waterproof cover plate includes an inner sealing plate 5 and an outer cover plate 6. The inner sealing plate 5 includes a sealing plate body 51, and latching plates 52 arranged at the two ends of the back of the sealing plate body 51. The latching plate 52 is provided with a latching hook 53 at the inner side thereof. Wall plates at the two sides of the sealing plate body, corresponding to a gap between the two assembled steel-structure unit house modules, are provided with through holes of two rows of screws. The inner sealing plate 5 is fixed at the opening of the vertical gap between the laterally assembled steel-structure unit house modules via the screw 54. A waterproof glue is injected into the head of the screw 54. A first sealant 55 is injected into two side gaps where the inner sealing plate 5 contacts the wall plate 38. The first sealant 55 is a weather-resistant sealant. The outer cover plate 6 includes a fixing plate body 61, and a hook plate 62 arranged at the back of the fixing plate body 61. The hook plate 62 is provided with a clamping hook 63 that cooperates with the latching hook 53. The latching hook 53 is sealed and covered by the outer cover plate 6 by cooperation between the clamping hook 63 and the latching hook 53. The fixing plate body 61 is provided with a sealing edge plate 64 bent toward the back thereof at the two sides thereof. A second sealant 65 is injected into a gap between the sealing edge plate 64 and an aluminum decorative outer wall plate 38.

[0074] At the laterally assembled places of the left and right steel-structure unit house modules, a fireproof and waterproof structure has to be mounted. First, an aluminum-foil-faced rock wool 75 - the rock wool wrapped in a tin foil at the outer side thereof - has to be inserted into an assembled gap of a sidewall system between the laterally assembled steel-structure unit house modules. Next, a fireproof glue 76 is applied to a vertical assembled gap on the outer side of the sidewall system. Then, a 2026208015   22 Jul 2026 fourth sealant 77 is applied to left and right assembled gaps of the outer wall system for waterproofing. The fourth sealant 77 is a weather-resistant sealant. Finally, the vertical waterproof cover plate is mounted. A gap between the vertical waterproof cover plate and a building module is also filled with a second sealant 65 for waterproofing. The second sealant 65 is the weather-resistant sealant. The above installation steps are repeated sequentially to complete the fireproofing and waterproofing construction of the vertical assembled gap for an entire building.

[0075] As shown in FIG.10, at the longitudinally assembled places of the upper and lower steel structure unit house modules, once the module connecting bolts 18 inside the upper connecting box 10 and the lower connecting box 20 are mounted, a waterproofing structure of a laterally assembled gap can be mounted. The opening of a lateral gap between the longitudinally assembled steel-structure unit house modules is sealed with a lateral waterproof cover plate. The lateral waterproof cover plate includes a composite plate made by compounding a galvanized sheet iron 71, a calcium silicate plate 72, and an aluminum profile sheet 73. The composite plate is compounded in a factory. The lateral waterproof cover plate is fastened to the outer wall system of the aluminum decorative outer wall plate 38 at an outer facade at the assembled place of the steel-structure unit house module above and the steel-structure unit house module below with the screw at the upper and lower ends thereof, respectively. A third sealant 74 is injected into a contact place between the upper and lower edges of the lateral waterproof cover plate and the aluminum decorative outer wall plate 38 of the steel-structure unit house module. The third sealant 74 is the weather-resistant sealant. The above installation steps are repeated sequentially, in conjunction with the fireproofing and waterproofing construction for the longitudinally assembled gap, to complete the construction of a waterproof system of the laterally assembled gap of the entire building.

[0076] In the embodiment, as shown in FIGS 15-19, when a building module needs to be provided with a corridor, the vertical column 1 is provided with a corridor connecting structure at one side thereof. The corridor connecting structure includes a corridor plate supporting rod. The corridor plate supporting rod is provided thereon with a bolted hole 44 for connecting a prefabricated corridor floor 46. The prefabricated 2026208015   22 Jul 2026 corridor floor 46 is prefabricated with the concrete and provided with a bolted countersink 45 at a place corresponding to the bolted hole 44 of the corridor plate supporting rod.

[0077] In the embodiment, the corridor plate supporting rod includes two parallelly arranged supporting U-shaped steels 42 and two L-shaped steel plates 43. Each of the two L-shaped steel plates 43 is fixed to the outer face of the adjacent column 1 of the laterally assembled steel structure unit house modules at one face thereof, respectively. The L-shaped steel plate 43 is prefabricated, connected and fixed to the outer face of the vertical column 1 by welding or is integrally made through the mould and the thermal machining. The other panel of the L-shaped steel plate is arranged vertically. The two supporting U-shaped steels are fixedly connected to a vertical panel of the L-shaped steel plate by the bolt, respectively. The bolted hole is formed at an upper lateral panel of the supporting U-shaped steel.

[0078] In the embodiment, the prefabricated L-shaped steel plate 43 on the steel structure unit house module is connected to the supporting U-shaped steel 42 by the bolt. Next, the prefabricated corridor floor 46 is placed on the supporting U-shaped steel 42 and fixed by the bolt. Finally, the gap is filled with a cement mortar. This process is repeated sequentially until the corridor construction for the entire building is completed.

[0079] As shown in FIG.23, in the embodiment, the outer wall system consists of, a fireproof plate 391, a rock wool 392, a calcium silicate plate 394, and an aluminum decorative outer wall plate 38 that are mounted sequentially on a keel 393 from inside out.

[0080] As shown in FIG.24, in the embodiment, the sidewall system consists of the fireproof plate 391, the rock wool 392, and the calcium silicate plate 394 that are mounted sequentially on the keel 393 from inside out.

[0081] As shown in FIG.25, in the embodiment, the ceiling and roof system consists of the fireproof plate 391, the rock wool 392, and a waterproof steel foil 395 that are mounted sequentially on the keel 393 from inside out.

[0082] FIGS 20-22 show reference diagrams of the lateral and longitudinal assembly of the structure unit house modules in a preferred embodiment of the present invention. 2026208015   22 Jul 2026

[0083] The present invention provides a steel-structure module, a node connecting device, and a steel-structure module building.

[0084] For a steel-structure unit house module of the present invention, after the steel-structure module is completed, construction continues on top of the steel-structure module. The structure module is wrapped with a calcium silicate plate 394 at the outer side thereof and wrapped with a fireproof plate 391 at the inner side thereof. A keel 393 made of a light-steel material at the inner and outer sides of the structure module is used as a supporting system for a wall structure. Additionally, a cavity within a wall is filled with a rock wool 392. Therefore, one outer wall system is formed. A steel structure at the top of a roof structure of a ceiling and roof system is wrapped with a waterproof steel foil 395 at the top thereof to ensure waterproofing. A ceiling system consists of the fireproof plate 391, the keel 393 made of the light-steel material, and the rock wool 392. Aluminum decorative outer walls in different designs and different colors can be mounted at the outer wall system according to a customer’s different requirements. Together with a door and window system, the outer wall system ultimately forms a complete steel-structure module building, thereby meeting a range of functional requirements such as fireproofing, moisture resistance, sound insulation, and thermal insulation.

[0085] Upon completion, the steel-structure module building is transported to a construction site of a project via various means (such as land or water transport). Construction and installation personnel quickly connect and secure tightly the steel-structure module building to a first-floor steel structure module by a pre-embedded foundation connecting structure. A plurality of modules are connected and secured tightly laterally as shown in FIG.7. Then, adjacent steel-structure unit house module buildings are connected and secured to one another through a reserved construction cavity, ultimately completing the assembly of an entire block.

[0086] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection of this application. Any equivalent change made within the spirit and principle of the present invention, based on a structure, a shape, and the principle of this application, shall be included within the scope of protection claimed by the present invention.

Claims

1. A steel-structure modularized integrated steel building structure system, comprising a plurality of cube-shaped steel-structure unit house modules assembled both laterally and longitudinally, wherein the steel-structure unit house module comprises four vertical columns (1), two upper crossbeams (31), two lower crossbeams (32), two upper longitudinal beams (33), two lower longitudinal beams (34), a sub-frame, a supporting rod, a floor slab (35), an outer wall system, a sidewall system, a ceiling and roof system, and a foundation connecting structure; the vertical column (1) is provided with an upper connecting box (10) and a lower connecting box (20) at a top thereof and a bottom thereof, respectively, and with a module positioning pin (4), a connecting plate (8), and a module connecting bolt (18) that cooperates with the upper connecting box (10) and the lower connecting box (20), the steel-structure unit house modules are assembled laterally and longitudinally to assemble a prefabricated building;the upper connecting box (10) comprises an upper connecting box bottom plate (11), an upper connecting box top plate (12), an upper connecting box back plate (13), and an upper connecting box side plate (14); the upper connecting box forms an upper connecting box operational recess (15) at an opening of an outer side thereof; the upper connecting box bottom plate (11), the upper connecting box top plate (12), the upper connecting box back plate (13), and the upper connecting box side plate (14) form a bolted construction cavity, and the upper connecting box top plate (12) is provided with an upper positioning pin hole (16) and an upper bolted hole (17);the lower connecting box (20) comprises a lower connecting box bottom plate (21), a lower connecting box top plate (22), a lower connecting box back plate (23), and a lower connecting box side plate (24); the lower connecting box forms a lower connecting box operational recess (25) at an opening of an outer side thereof; the lower connecting box bottom plate (21), the lower connecting box top plate (22), the lower connecting box back plate (23), and the lower connecting box side plate (24) form a bolted construction cavity, and the lower connecting box bottom plate (24) is provided with a lower positioning pin hole (26) and a lower bolted hole (27);the connecting plate (8) is one plate body that matches the upper connecting box top plate (12) and the lower connecting box bottom plate (22); the connecting plate (8) is2026208015   22 Jul 2026provided thereon with at least two connecting plate pin holes (81) for cooperating with the upper positioning pin hole (16) and the lower positioning pin hole (26), as well as at least two connecting plate bolted holes (82) for cooperating with the upper bolted hole (17) and the lower bolted hole (27);the module positioning pin (4) is fixed in the upper positioning pin hole (16) at a lower section thereof, and the module positioning pin (4) extends upwards at an upper section thereof;the upper connecting box top plate (12) is connected to an upper port of the vertical column (1) at an inner face thereof far away from an end of the upper connecting box side plate (14); the upper connecting box bottom plate (11) is connected to a side face of the vertical column (1) at a side face thereof; the upper connecting box back plate (13) is welded to an end of the upper crossbeam (31) at an outer side face thereof; the upper connecting box side plate (14) is welded to an end of the upper longitudinal beam (33) at an outer side face thereof, and the upper positioning pin hole (16) is directly opposite to a middle of the upper port of the vertical column (1);the lower connecting box bottom plate (21) is connected to a lower port of the vertical column (1) at an inner side face thereof far away from an end of the lower connecting box side plate (24); the lower connecting box top plate (22) is connected to a side face of the vertical column (1) at a side face thereof; the lower connecting box back plate (23) is welded to an end of the lower crossbeam (32) at an outer side face thereof; the lower connecting box side plate (24) is welded to an end of the lower longitudinal beam (34) at an outer side face thereof, and the lower positioning pin hole (26) is directly opposite to a middle of the lower port of the vertical column (1).

2. The steel-structure modularized integrated building structure system according to claim 1, wherein the upper connecting box (10) and the lower connecting box (20) are each welded with a high-strength structure steel plate; the upper connecting box top plate (12) and the upper connecting box bottom plate (11) are welded to the vertical column (1), and the lower connecting box bottom plate (21) and the lower connecting box top plate (22) are welded to the vertical column (1).

3. The steel-structure modularized integrated building structure system according to claim 1, wherein the foundation connecting structure comprises base connecting boxes (90)2026208015   22 Jul 2026arranged at four corners of a bottom of a first-floor steel-structure unit house module, an anchor bar (92) pre-embedded in a concrete of a foundation, an embedded plate (91) fixed to an upper part of the anchor bar (92), a base connecting bottom plate (93) fixed to an upper part of the embedded plate (91), a spacer plate (94) mounted between the base connecting bottom plate (93) and the base connecting box (90), a base positioning pin (95), and a base connecting bolt (96); the base connecting box (90) comprises a base connecting box bottom plate (901), a base connecting box top plate (902), a base connecting box back plate (903), and a base connecting box side plate (904); the base connecting box (90) forms a base connecting box operational recess at an opening of an outer side thereof; the base connecting box bottom plate (901) , the base connecting box top plate (902), the base connecting box back plate (903), and the base connecting box side plate (904) form a construction cavity connected to the base connecting bolt (96); the base connecting box bottom plate (901), the spacer plate (94), and the base connecting bottom plate (93) are provided thereon with the base positioning pin hole and the base connecting bolted hole; through holes are all formed at places of a connecting hole of the base connecting bolt and the base positioning pin hole, corresponding to the embedded plate (91); the base connecting bottom plate (93) is welded to a base connecting nut (97) matching the base connecting bolt and a base positioning pin nut (98) matching the base positioning pin at a lower part thereof, and the embedded plate (91) is welded to clearance boxes (99) at a lower part thereof corresponding to peripheries of the base connecting nut (97) and the base positioning pin nut (98).

4. The steel-structure modularized integrated building structure system according to claim 1, wherein an opening of a vertical gap between the laterally assembled steel-structure unit house modules is sealed with a vertical waterproof cover plate; the vertical waterproof cover plate comprises an inner sealing plate (5) and an outer cover plate (6); the inner sealing plate (5) comprises a sealing plate body (51), and latching plates (52) arranged at two ends of a back of the sealing plate body (51); the latching plate (52) is provided with a latching hook (53) at an inner side thereof; wall plates at two sides of the sealing plate body (51), corresponding to a gap between the two assembled steel-structure unit house modules, are provided with through holes of two rows of screws; the inner sealing plate (5) is fixed at the opening of the vertical gap between the laterally2026208015   22 Jul 202624 assembled steel-structure unit house modules via the screw(54); a waterproof glue is injected into a head of the screw (54); a first sealant (55) is injected into two side gaps where the inner sealing plate (5) contacts the wall plate (38); the outer cover plate (6) comprises a fixing plate body (61), and a hook plate (62) arranged at a back of the fixing plate body (61); the hook plate (62) is provided with a clamping hook (63) that cooperates with the latching hook (53); the latching hook (53) is sealed and covered by the outer cover plate (6) by cooperation between the clamping hook (63) and the latching hook (53); the fixing plate body (61) is provided with a sealing edge plate (64) bent toward a back thereof at two sides thereof, and a second sealant (65) is injected into a gap between the sealing edge plate (64) and the wall plate (38).

5. The steel-structure modularized integrated building structure system according to claim 1, wherein an opening of a lateral gap between the longitudinally assembled steel-structure unit house modules is sealed with a lateral waterproof cover plate; the lateral waterproof cover plate comprises a composite plate made by compounding a galvanized sheet iron (71), a calcium silicate plate (72), and an aluminum profile sheet (73); the lateral waterproof cover plate is fastened to the wall plate (38) at an outer facade at an assembled place of the steel-structure unit house module above and the steel-structure unit house module below with the screw at upper and lower ends thereof, respectively, and a third sealant (74) is injected into a contact place between upper and lower edges of the lateral waterproof cover plate and the wall plate (38) of the steel-structure unit house module.

6. The steel-structure modularized integrated building structure system according to claim 1, wherein the gap between the laterally assembled steel-structure module units is further filled with a fireproof and waterproof material, and the fireproof and waterproof material comprises an aluminum foil-faced rock wool (75), a fireproof glue (76), and a fourth sealant (77) that are filled from inside out.

7. The steel-structure modularized integrated building structure system according to claim 1, wherein the vertical column (1) is provided with a corridor connecting structure at one side thereof; the corridor connecting structure comprises a corridor plate supporting rod; the corridor plate supporting rod is provided thereon with a bolted hole (44) for connecting a prefabricated corridor floor (46); the prefabricated corridor floor (46) is2026208015   22 Jul 202625 prefabricated with the concrete and provided with a bolted countersink (45) at a place corresponding to the bolted hole (44) of the corridor plate supporting rod;the corridor plate supporting rod comprises two parallelly arranged supporting U-shaped steels (42) and two L-shaped steel plates (43); one panel of the two L-shaped steel plates (43) is fixed to an outer side of adjacent laterally assembled vertical columns (1), and the other panel of the L-shaped steel plate (43) is arranged vertically; the two supporting U-shaped steels (42) are fixedly connected to a vertical panel of the L-shaped steel plate (43) by the bolt, respectively, and the bolted hole (44) is formed at an upper lateral panel of the supporting U-shaped steel (42).

8. The steel-structure modularized integrated building structure system according to claim 1, wherein the supporting rod comprises a longitudinal supporting rod (361) and a diagonal supporting rod (362) that are connected to the upper crossbeam (31) and the lower crossbeam (32); the sub-frame comprises a side vertical rod (371) positioned near one vertical column (1) and connected to the upper longitudinal beam (33) and the lower longitudinal beam (34), a middle longitudinal rod connected to the side vertical rod (371) and the other vertical column (1), and a middle vertical rod (373) connected to the middle longitudinal rod (372) and the lower longitudinal beam (34).

9. The steel-structure modularized integrated building structure system according to claim 1, wherein the upper positioning pin hole (16) comprises a through hole formed in the upper connecting box top plate (12) and a positioning pin nut (161) pre-welded to an inner side of the upper connecting box top plate (12); the positioning pin (4) is provided with an outer thread (40) that matches an inner thread of the positioning pin nut (161) at a lower section thereof, and the positioning pin (4) is provided with a conical face (41) at an upper section thereof.

10. The steel-structure modularized integrated building structure system according to claim 1, wherein the outer wall system consists of a fireproof plate (391), a rock wool (392), a calcium silicate plate (394), and an aluminum decorative outer wall plate (38) that are mounted sequentially on a keel (393) from inside out, and the sidewall system consists of the fireproof plate (391), the rock wool (392), and the calcium silicate plate (394) that are mounted sequentially on the keel (393) from inside out;the ceiling and roof system consists of the fireproof plate (391), the rock wool (392),2026208015   22 Jul 2026and a waterproof steel foil that are mounted sequentially on the keel (393) from inside out.

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