Steel structure fireproof concrete layer fabricated structure and construction method thereof

Abstract

The invention discloses a steel structure fireproof concrete layer fabricated structure and a construction method thereof.According to the scheme, a fireproof concrete layer wrapping a steel structure is divided into small parts, the small parts are poured and formed respectively, steel wire meshes or small-diameter steel bars can be arranged in the parts, and then the parts are conveyed to a construction site; the fireproof concrete layer is installed on the periphery of the steel structure in the modes of mortar masonry, hanging bar bending, steel bar welding and the like; according to the scheme, various hole channels and gaps generated in the structure in the construction process are filled with waterproof cement mortar, and the leakage problem is prevented. According to the scheme, the small block parts of the fireproof concrete layer are convenient to form and can be designed into various shapes according to actual requirements; the whole is broken up into parts, parts are not heavy, assembly on a construction site is convenient, and on-site formwork erecting is avoided; after the structure is constructed and formed, the fire endurance time of the steel structure can be effectively prolonged, and the fabricated fireproof concrete layer can also be used as an external facing of the steel structure; and in addition, the fabricated fireproof concrete layer is properly treated, so that the leakage problem is avoided.

Description

Technical Field

[0001] The present invention relates to the fields of civil engineering construction technology and prefabricated building technology, and in particular to a steel structure fireproof concrete layer prefabricated structure and a construction method thereof. Background Art

[0002] Steel structure buildings have the characteristics of high bearing capacity. However, in fire or high temperature, steel is very easy to soften and lose its bearing capacity. Among them, the Chinese patent "A semi-combined prefabricated assembled beam (authorization announcement number CN209194844U)" and the Chinese patent "A semi-combined prefabricated assembled column (authorization announcement number CN209194852U)" propose a method of wrapping a concrete fireproof layer around the steel structure to protect the internal steel structure from high temperature damage under fire, prolong the time for the steel to deform due to heat and lose its bearing capacity, thereby enhancing the overall fire resistance of the structure. However, the thickness of the external concrete fireproof layer cannot be too thin, otherwise the heat-insulating effect cannot be achieved. Generally, the thickness is required to be greater than or equal to 50mm.

[0003] Regarding the construction method of how to attach the concrete fireproof layer to the steel structure, the above two patents mention "arranging a steel mesh on the outer surface of the steel beam (column), erecting a formwork on the factory formwork platform (for the steel beam and steel column), pouring concrete, vibrating and compacting it, and quickly steam curing it to the designed strength before demoulding." However, this construction method has the following disadvantages:

[0004] 1. The steel structure itself is a prefabricated structure. The steel components are welded on site to form an integral steel structure. The crane lifting capacity on the construction site is limited. The practice of wrapping the steel structure with a fireproof concrete layer during the prefabrication stage in the factory obviously increases the burden on the crane on the construction site.

[0005] 2. Steel components are large in size and weight. If formwork is set up outside the steel components, it will inevitably face the construction difficulties of inconvenient movement and flipping of the steel components.

[0006] 3. The fireproof concrete layer is cast on the upper, lower, left and right sides of the steel structure. The casting range is large, there are many corners, and there is also the shielding of the steel structure and the steel wire mesh is configured in the fireproof concrete layer, which will cause the concrete vibration to be not dense, leaving the defect of honeycomb surface (see Figure 1 );

[0007] 4. When pouring the fireproof concrete layer of steel components in the factory, the joints of the steel components must be reserved, which will inevitably lead to pouring the fireproof concrete layer on the joints again at the construction site, wasting labor. Summary of the invention

[0008] In view of this, the object of the present invention is to propose a steel structure fireproof concrete layer prefabricated structure and a construction method thereof which is reliable in implementation, convenient in construction, and easy and efficient to install.

[0009] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0010] A fireproof concrete layer assembled structure at the steel structure beam part, comprising:

[0011] Steel beams are I-beams;

[0012] The U-shaped segment fireproof concrete layer is multiple in number and 50-60 mm thick. The main body is made of concrete and has a U-shaped steel frame built in. Both ends of the steel frame extend upward from the upper end surface of the U-shaped segment. The inner U-shaped open side of the U-shaped segment is inserted into the steel beam by the lower flange of the steel beam, and multiple U-shaped segment fireproof concrete layers are arranged side by side on the steel beam.

[0013] A concrete floor slab is cast on the upper flange of a steel beam, and its edges extend beyond both sides of the upper flange. The concrete floor slab is provided with through holes which are opposite to the upper protruding sections of the steel skeleton of the U-shaped segment fireproof concrete layer. After the upper protruding sections of the steel skeleton pass upward through the through holes, they are bent toward each other and fixed on the concrete floor slab.

[0014] As a possible implementation mode, further, the steel bar skeleton described in this solution is composed of a plurality of U-shaped steel bars arranged at intervals and a plurality of longitudinal steel bars that are welded and fixed to the plurality of U-shaped steel bars;

[0015] Cement-based caulking agent is also applied to opposite sides of the fireproof concrete layer adjacent to the U-shaped segment.

[0016] As a possible implementation method, further, the solution also includes:

[0017] The number of transverse steel bars corresponds to the number of protruding sections of the upper part of the steel skeleton in the U-shaped segment fireproof concrete layer. The transverse steel bars are arranged on the upper end surface of the concrete floor slab and are respectively welded to the ends of the steel skeleton bent toward each other to form welds.

[0018] Based on the above, this scheme also proposes a construction method for a fireproof concrete layer prefabricated structure at the steel structure beam part, which includes:

[0019] S01, tying a steel skeleton and placing it in a mold to form a U-shaped segment fireproof concrete layer of preset specifications, and at the same time, making both ends of the steel skeleton higher than the upper end surface of the U-shaped segment;

[0020] S02, installing steel beams, pouring concrete floor slabs on the steel beams, and reserving through holes that match the upper protruding sections of the steel skeleton on the U-shaped segment fireproof concrete layer;

[0021] S03, inserting the inner U-shaped open side of the U-shaped segment fireproof concrete layer into the steel beam through the lower flange of the steel beam, and at the same time, passing the upper protruding section of the steel skeleton upward through the penetration hole, bending it towards each other and fixing it on the concrete floor slab, and then welding it with transverse steel bars, and fixing the two ends of the bent steel skeleton with the welds formed by welding;

[0022] S04, applying cement mortar on the side of the U-shaped segment fireproof concrete layer, and then repeating S03 to S04 to arrange multiple U-shaped segment fireproof concrete layers side by side on the steel beam;

[0023] S05. Fill the through holes on the concrete floor slab with waterproof cement mortar, and apply cement-based caulking agent on opposite sides of the fireproof concrete layers of adjacent U-shaped segments.

[0024] Based on the above, this scheme also proposes a steel structure steel column, a fireproof concrete layer assembly structure at the column foot, which includes:

[0025] Steel column, which is I-beam;

[0026] A bottom plate, fixedly connected to the column foot of the steel column, and the bottom plate is provided with a plurality of reinforcing ribs;

[0027] A connecting assembly is arranged on the base plate and is used to assist in installing the base plate;

[0028] There are multiple fireproof concrete blocks, which are assembled and laid on the lower part of the steel column and surround and cover the connection between the steel column and the bottom plate.

[0029] As a preferred implementation option, preferably, the connecting assembly described in this solution includes bolts, nuts and washers, and the base plate is provided with mounting holes for the bolts to pass through.

[0030] As a preferred implementation option, preferably, the fireproof concrete block corresponds to the reinforcing ribs on the bottom plate and the connecting components are provided with contoured avoidance grooves with structures adapted thereto.

[0031] Based on the above, this scheme also proposes a method for constructing a steel structure steel column and a fireproof concrete layer at the column foot, which includes the following steps:

[0032] S01. According to the shape of the column foot of the steel column, a mold for making a fireproof concrete block is set thereon, and concrete is poured to form the mold, and then demoulding is performed to obtain a prefabricated fireproof concrete block;

[0033] S02. Apply a layer of cement mortar on the bottom plate surface of the column foot area, the side of the steel column, the side of the stiffening rib, and the internal contact surface of the fireproof concrete block. Then fit the prefabricated fireproof concrete block on the bottom plate surface, and simultaneously complete the installation and matching of the side of the steel column and the side of the stiffening rib, so that the stiffening ribs, bolts, nuts, gaskets and other components are just inserted into the cavity of the fireproof concrete block. After the cement mortar hardens, the fireproof concrete block is firmly installed in the column foot area.

[0034] Based on the above, the present invention further proposes a fireproof concrete layer assembled structure at the steel structure beam-column node, wherein the steel structure beam-column node comprises a steel column and at least one steel beam connected to the side of the steel column, which comprises:

[0035] Fireproof concrete blocks are installed on both sides of the webs of steel columns and / or steel beams and abut against the flanges of the corresponding steel columns and / or steel beams. The filled fireproof concrete blocks shield the steel in the node area to achieve a fireproof effect.

[0036] There are multiple U-shaped segment fireproof concrete layers, the main body of which is made of concrete with a thickness of 50 to 60 mm, and a steel skeleton of a U-shaped structure is built in, the two ends of the steel skeleton extend upward from the upper end surface of the U-shaped segment, the inner U-shaped open side of the U-shaped segment is inserted into the steel beam by the lower flange of the steel beam, and multiple U-shaped segment fireproof concrete layers are arranged side by side on the steel beam;

[0037] A concrete floor slab is cast on the upper flange of a steel beam, and its edges extend beyond both sides of the upper flange; the concrete floor slab is provided with through holes corresponding to the upper protruding sections of the steel skeleton of the U-shaped segment fireproof concrete layer, and the two ends of the steel skeleton are passed upward through the through holes and then bent toward each other and fixed on the concrete floor slab.

[0038] Based on the above, this scheme also proposes a method for constructing a fireproof concrete layer prefabricated structure at the joint of a steel structure beam and column, which includes:

[0039] S01. Install fireproof concrete blocks at the bottom of the steel column, wherein the topmost fireproof concrete block presses against the lower flange of the steel beam above it, and when there is a gap between the two, fill the gap with cement mortar;

[0040] S02. Apply cement mortar with a thickness of about 10 mm on the top surface of the topmost fireproof concrete block and the top surface of the lower flange of the steel beam for leveling; then apply a layer of cement mortar on the corresponding web side and flange side of the steel beam and steel column in the node area, and fill the node area with regular fireproof concrete blocks to form a neat structural external interface. At the same time, the filled fireproof concrete blocks cover the steel in the node area to achieve a fireproof effect;

[0041] S03. Set up formwork on the steel beam and pour concrete floor slab;

[0042] S04. Install the U-shaped segment fireproof concrete layer on the outside of the steel beam near the node area;

[0043] S05. Apply cement mortar on the concrete floor surface to level it, and then start installing the fireproof concrete layer on the steel column.

[0044] Based on the above, the present invention further proposes a steel structure fireproof concrete layer assembled structure, which includes the above-mentioned steel structure beam fireproof concrete layer assembled structure or the above-mentioned steel structure steel column, column foot fireproof concrete layer assembled structure or the above-mentioned steel structure steel beam node fireproof concrete layer assembled structure;

[0045] Alternatively, it is obtained by one of the above-mentioned construction methods for the prefabricated structure of the fireproof concrete layer at the beam part of the steel structure, the above-mentioned construction method for the prefabricated structure of the fireproof concrete layer at the steel column and the column foot part of the steel structure, and the above-mentioned construction method for the prefabricated structure of the fireproof concrete layer at the node part of the steel beam of the steel structure.

[0046] By adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: the present scheme ingeniously divides the fireproof concrete layer wrapped around the steel structure into small pieces, which are cast and formed separately. Steel mesh or small-diameter steel bars can be built inside the pieces, and then transported to the construction site, the fireproof concrete layer is installed on the periphery of the steel structure by means of mortar masonry, bending of suspension bars, welding of steel bars, etc. On this basis, the present scheme uses waterproof cement mortar to fill various channels and gaps generated in the structure during construction to prevent leakage problems. The small pieces of the fireproof concrete layer of the present scheme are easy to form and can be designed into various shapes according to actual needs; the whole is divided into parts, the parts are not heavy, and the assembly is convenient on the construction site, avoiding the need to set up formwork on site; after the structure is constructed and formed, the fire resistance limit time of the steel structure can be effectively extended; the assembled fireproof concrete layer can also be used as the external finish of the steel structure; if the assembled fireproof concrete layer is properly treated, leakage problems will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a schematic diagram of the prior art that the concrete vibration is not dense, resulting in honeycomb surface defects on the cast-in-place fireproof concrete layer outside the steel beam;

[0049] Figure 2 It is a brief three-dimensional structural diagram of the U-shaped segment fireproof concrete layer used in the assembled structure of the fireproof concrete layer at the steel structure beam part of this scheme;

[0050] Figure 3 It is a brief three-dimensional structural diagram of the steel skeleton of the U-shaped segment used in the fireproof concrete layer prefabricated structure of the steel structure beam part of this scheme;

[0051] Figure 4 It is a schematic diagram of the state changes during the construction of the fireproof concrete layer prefabricated structure of the steel structure beam part of this scheme;

[0052] Figure 5 This is a schematic diagram of the state changes of the steel columns and fireproof concrete layers at the base of the steel structure during the construction process of the prefabricated structure of this scheme;

[0053] Figure 6 This is a schematic diagram of the structure of the mold used in the assembled structure of the fireproof concrete layer at the steel column and column foot of the steel structure of this scheme and the corresponding formed fireproof concrete block;

[0054] Figure 7 It is a schematic diagram of the state changes during the construction of the fireproof concrete layer prefabricated structure at the node of the steel beam of the steel structure of this scheme. DETAILED DESCRIPTION

[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0056] The present embodiment discloses a steel structure fireproof concrete layer assembly structure, which includes a steel structure beam fireproof concrete layer assembly structure, a steel structure steel column, a column foot fireproof concrete layer assembly structure, and a steel structure beam-column joint fireproof concrete layer assembly structure. Correspondingly, the present solution also provides a construction method for the steel structure beam fireproof concrete layer assembly structure, a construction method for the steel structure steel column, a column foot fireproof concrete layer assembly structure, and a steel structure beam-column joint fireproof concrete layer assembly structure.

[0057] In this scheme, the steel structure mainly includes beams, columns, column bases, beam-column joints and other parts. The structural forms of each part have different levels of complexity. The following describes separately how to apply the steel structure fireproof concrete layer prefabricated structure and its construction method in the above four steel structure parts. The steel beams and steel columns are all commonly used I-shaped sections; this scheme specifically includes the following:

[0058] Combination Figures 2 to 4 As shown in one of the embodiments, the fireproof concrete layer assembly structure of the steel structure beam part includes:

[0059] The steel beam 3 is an I-beam having a web 31 and a flange 32;

[0060] There are multiple U-shaped segment fireproof concrete layers 1, the main body of which is made of concrete with a thickness of 50 to 60 mm, and a steel skeleton 2 of a U-shaped structure is built in. Both ends of the steel skeleton 2 extend upward from the upper end surface of the U-shaped segment 1. The inner U-shaped open side of the U-shaped segment fireproof concrete layer 1 is inserted into the steel beam 3 by the lower flange 32 of the steel beam 3, and multiple U-shaped segment fireproof concrete layers 1 are arranged side by side on the steel beam 3; cement-based caulking agent 7 is also applied to the opposite sides of adjacent U-shaped segment fireproof concrete layers 1;

[0061] The concrete floor slab 4 is cast on the upper flange of the steel beam 3, and its edges extend beyond both sides of the upper flange. The concrete floor slab 4 is provided with through holes 41 which are opposite to the upper protruding sections of the steel skeleton 2 of the U-shaped segment fireproof concrete layer. After the upper protruding sections of the steel skeleton 2 pass upward through the through holes 41, they are bent toward each other and fixed on the concrete floor slab 4.

[0062] In this solution, the steel bar skeleton 2 described in this solution is composed of a plurality of U-shaped steel bars 21 arranged at intervals and a plurality of longitudinal steel bars 22 that are welded and fixed to the plurality of U-shaped steel bars 21 .

[0063] Among them, as a possible implementation method, the thickness of the fireproof concrete layer corresponding to the U-shaped segment fireproof concrete layer 1 of this scheme is generally 50mm, and it is embedded with wire mesh or U-shaped steel bars, longitudinal steel bars, etc. The space is small, and it is appropriate to use fine stone concrete casting and prefabrication in the factory.

[0064] In order to improve the matching reliability between the U-shaped segment fireproof concrete layer 1 and the concrete floor slab 4, further, the present solution also includes:

[0065] The number of transverse steel bars 5 corresponds one-to-one to the number of U-shaped steel bars in the U-shaped segment fireproof concrete layer 1. The transverse steel bars 5 are arranged on the upper end surface of the concrete floor slab 4 and are respectively welded to the ends of the steel bar skeleton 2 that are bent toward each other to form welds 6.

[0066] Based on the above, this scheme also proposes a construction method for a fireproof concrete layer prefabricated structure at the steel structure beam part, which includes:

[0067] S01. Bundle the steel skeleton and place it in a mold to form a U-shaped segment fireproof concrete layer of preset specifications. At the same time, make the two ends of the steel skeleton higher than the upper end surface of the U-shaped segment.

[0068] Combination Figure 2 or Figure 3 As shown, in this scheme, the segment length modulus of the U-shaped segment fireproof concrete layer can be set to 100mm, 200mm, 300mm, etc., which can be set according to actual needs; in this way, the component has the advantages of light weight, easy manufacturing, transportation, and assembly on the construction site; and the component size modulus can be set according to actual needs, which has the advantage of flexibility and variability; at the same time, the molding mold can also be manufactured according to the size modulus to mass-produce U-shaped segment fireproof concrete layers.

[0069] In this scheme, the thickness of the U-shaped segment fireproof concrete layer is generally 50mm (due to the requirements of fire prevention and heat resistance, the fireproof concrete layer has a certain thickness); the U-shaped segment fireproof concrete layer has a built-in steel skeleton (or a steel mesh), which can prevent the fireproof concrete layer from cracking and falling off; enhance the mechanical properties of the fireproof concrete layer under fire. The steel skeleton is composed of U-shaped steel bars (or hangers) and longitudinal steel bars; the diameters of the U-shaped steel bars (or hangers) and longitudinal steel bars are generally 8mm, 10mm, 12mm, which are easy to accommodate inside the fireproof concrete layer; the longitudinal spacing of the U-shaped steel bars (or U-shaped hangers) can generally be set to 100mm, 150mm, 200mm, etc., or can be specifically set according to actual needs; the role of the U-shaped hangers is to provide sufficient hanging force for the assembled fireproof concrete layer structure to prevent it from falling during use. The longitudinal steel bars are evenly arranged along the corners, bottom and sides of the steel skeleton, and the spacing can generally be set to 100mm, 150mm, 200mm, etc., or can be specifically set according to actual needs; the role of the longitudinal steel bars is to form a steel skeleton by binding or welding with U-shaped hangers with iron wire to enhance the overall stability of the U-shaped segment fireproof concrete layer. The internal width and height of the U-shaped segment fireproof concrete layer should fit the outer end interface of the steel beam to facilitate on-site construction and installation; the end of the U-shaped hanger should extend a certain length from the top surface of the U-shaped segment fireproof concrete layer, and the extended length is generally approximately equal to the sum of the thickness of the concrete floor and half of the horizontal width of the U-shaped steel bar; the purpose of this practice is that during on-site assembly, the end of the U-shaped hanger can pass through the reserved installation channel of the floor, and further, the reserved length steel bar segment of the end of the U-shaped hanger can be bent, welded, fixed, etc.

[0070] When the factory prefabricates the U-shaped segment fireproof concrete layer, the corresponding detachable steel mold should be made first, the steel skeleton should be placed and fixed in the mold, and then the fireproof concrete should be poured, and finally the mold should be demolded. The advantage of using a detachable steel mold is that it can be reused and mass-produced to prefabricate the U-shaped segment fireproof concrete layer.

[0071] S02. Install steel beams, cast concrete floor slabs on the steel beams, and reserve through holes that match the steel skeleton on the U-shaped segment fireproof concrete layer; wherein the longitudinal spacing of the through holes should be the same as the longitudinal spacing of the U-shaped hangers buried in the fireproof concrete layer, and the transverse spacing of the through holes should be the same as the spacing of the left and right limbs of the U-shaped hangers buried in the fireproof concrete layer; the diameter of the through holes should be 10 to 20 mm larger than the diameter of the U-shaped steel bars to prevent large positioning errors of the holes or U-shaped steel bars from causing difficulties in on-site installation.

[0072] S03. Temporarily lift the fireproof concrete layer of the U-shaped segment into place, so that the inner side of the fireproof concrete layer of the U-shaped segment fits the side and bottom surfaces of the steel beam and the bottom surface of the concrete floor, and the inner U-shaped open side of the fireproof concrete layer of the U-shaped segment is inserted into the steel beam through the lower flange of the steel beam. At the same time, the upper protruding section of the steel bar skeleton is passed upward through the penetration hole, bent toward each other and fixed on the concrete floor, and then welded and fixed by transverse steel bars, and the bent ends of the steel bar skeleton are fixed by the welds formed by welding; in this way, the U-shaped steel bars formed by the steel bar skeleton form a loop, which firmly hoists the U-shaped segment fireproof concrete layer on the bottom surface of the concrete floor.

[0073] S04. Apply cement mortar on the side of the U-shaped segment fireproof concrete layer, and then repeat S03 to S04 to arrange multiple U-shaped segment fireproof concrete layers side by side on the steel beam; applying cement mortar on the side of the U-shaped segment fireproof concrete layer helps to fill the gaps between the U-shaped segment fireproof concrete layers, so that the steel beam is in a closed space isolated from the outside air. When a fire occurs, hot air will not directly contact the steel beam.

[0074] S05. Use waterproof cement mortar to fill the through holes on the concrete floor slab, and apply cement-based caulking agent on the opposite sides of the adjacent U-shaped segments; applying the cement-based caulking agent can prevent leakage; so that the fireproof concrete layer of the U-shaped segment can serve both as a fireproof function and a finishing function.

[0075] S06, fill the concrete floor surface with cement mortar for leveling, lay floor tiles and other subsequent decoration work. After this step is completed, the assembled fireproof concrete layer is firmly fixed and the external surface is flat; the fireproof concrete layer is equipped with a steel skeleton inside, and the integrity is strong; the assembled fireproof concrete layer surrounds the steel beam to form a closed space, which effectively plays a fireproof role.

[0076] Combination Figure 5 and Figure 6 As shown, based on the above, this solution also proposes a steel structure steel column, a fireproof concrete layer assembly structure at the column foot, which includes:

[0077] The steel column 8 is an I-beam having a web 82 and a flange 81;

[0078] A bottom plate 14, fixedly connected to the column foot area 9 of the steel column 8, and a plurality of reinforcing ribs 10 are provided on the bottom plate 14;

[0079] A connecting assembly, disposed on the bottom plate 14 and used to assist in mounting the bottom plate 14;

[0080] There are multiple fireproof concrete blocks 17, which are assembled and laid on the lower part of the steel column 8, and surround and cover the connection between the steel column 8 and the bottom plate 14.

[0081] Among them, as a preferred implementation option, preferably, the connecting assembly described in this solution includes a bolt 13, a nut 12 and a gasket 11, and the base plate 14 is provided with a mounting hole for the bolt 13 to pass through.

[0082] In order to improve the covering effect, as a better implementation option, preferably, the fireproof concrete block 17 corresponds to the reinforcing ribs 10 on the bottom plate, and the connecting component is provided with a contoured avoidance groove 171 with a structure adapted thereto.

[0083] In this scheme, the column body of the steel structure is generally a column of equal cross-section, and it is better to install a prefabricated fireproof concrete layer structure, while the structure of the column foot area is slightly more complicated, such as Figure 5 As shown, there are many stiffening ribs, bolts, nuts, and washers distributed in the steel column foot area, which block and hinder the installation and fitting of the fireproof concrete layer. The idea adopted is to prefabricate fireproof concrete blocks with multiple cavities inside, which fit the shapes of stiffening ribs, bolts, nuts, washers, etc., and install and lay the prefabricated fireproof concrete blocks in the column foot area 9. In the column body area, prefabricated fireproof concrete blocks are used to lay one by one from bottom to top to cover the column body.

[0084] In this scheme, the prefabricated fireproof concrete block components are easy to shape and can be designed into various shapes according to actual needs; they are broken down into small parts, the components are not heavy, and they are easy to build and assemble on the construction site, avoiding the need to set up formwork on site; after the structure is constructed, the fire resistance limit time of the steel structure can be effectively extended; the assembled fireproof concrete layer can also be used as the external finish of the steel column; the prefabricated fireproof concrete blocks are built around the steel column to form a confining pressure constraint on the steel column, which can improve the compressive stability of the steel column.

[0085] Based on the above, this scheme also proposes a method for constructing a steel structure steel column and a fireproof concrete layer at the column foot, which includes the following steps:

[0086] S01. Combination Figure 5 or Figure 6As shown, in this step, a mold 16 for making fireproof concrete blocks is set on the base of the steel column according to the shape of the base, and concrete is poured to form the blocks, and then demolding is performed to obtain a prefabricated fireproof concrete block 17, wherein the fireproof concrete block mold 16 is provided with raised portions 161, 162 for avoiding the reinforcing ribs 10 and the connecting components.

[0087] In this step, the fireproof concrete block forming mold can be specifically designed according to the column base structure. The fireproof concrete block forming mold and its internal partitions and filling blocks are all made of iron materials. After the cast fireproof concrete block is hardened and formed, there are multiple internal cavities of different shapes on it. The cavity should fit the outer contour shape of stiffening ribs, bolts, nuts, gaskets, etc. During production, the cavity size should be slightly larger than the outer contour size of stiffening ribs, bolts, nuts, gaskets, etc. to prevent the size error of the production from causing inconvenience in installation at the construction site.

[0088] Among them, the iron mold is welded by several steel plates and iron blocks, which is easy to make and store; the iron mold can be reused to produce fireproof concrete blocks in large quantities; the partitions and filling blocks in the mold can be flexibly designed according to the specific conditions of the column base area.

[0089] S02. Apply a layer of cement mortar on the bottom plate surface of the column foot area, the side of the steel column, the side of the stiffening rib, and the internal contact surface of the fireproof concrete block. Then fit the prefabricated fireproof concrete block on the bottom plate surface, and simultaneously complete the installation and matching of the side of the steel column and the side of the stiffening rib, so that the stiffening ribs, bolts, nuts, gaskets and other components are just inserted into the cavity of the fireproof concrete block. After the cement mortar hardens, the fireproof concrete block is firmly installed in the column foot area.

[0090] S03. Continue to install the upper layer of fireproof concrete blocks in the column area; apply a layer of cement mortar on the top surface of the fireproof concrete blocks of the next layer, the side of the steel column, and the internal contact surface of the fireproof concrete blocks, and install the prefabricated fireproof concrete blocks in place against the side of the steel column. After the cement mortar hardens, the fireproof concrete blocks are firmly installed in the column area.

[0091] In this step, the height of the fireproof concrete blocks around the column body can be 100mm, 150mm, 200mm, etc., and can be set according to actual conditions.

[0092] S04, repeat step S03; finally, indirectly caulking the surfaces between the fireproof concrete blocks.

[0093] In this step, the main function of the fireproof concrete block is to provide a fireproof concrete layer with a thickness of more than 50 mm around the periphery of the steel component.

[0094] Combination Figure 7As shown, based on the above, this solution also proposes a fireproof concrete layer assembled structure at the steel structure beam-column node, wherein the steel structure steel beam node includes a steel column and at least one steel beam connected to the side of the steel column, which includes:

[0095] Fireproof concrete blocks 19 are installed on both sides of the webs 84 of the steel columns 83 and / or steel beams 33, 34, 35, 36, and abut against the flanges of the corresponding steel columns and / or steel beams;

[0096] There are multiple U-shaped segment fireproof concrete layers 20, the main body of which is made of concrete and has a U-shaped steel frame built in. The upper protruding section of the steel frame extends upward from the upper end surface of the U-shaped segment. The inner U-shaped open side of the U-shaped segment fireproof concrete layer 20 is inserted into the steel beams 34, 35, 36 by the lower flange of the steel beams 33, 34, 35, 36, and multiple U-shaped segments 20 are arranged side by side on the steel beams 33, 34, 35, 36;

[0097] The concrete floor 21 is cast on the upper flange of the steel beam, and its edges extend beyond both sides of the upper flange. The concrete floor 21 is provided with through holes corresponding to the upper protruding sections of the steel skeleton of the U-shaped segment fireproof concrete layer 20. After the upper protruding sections of the steel skeleton pass upward through the through holes, they are bent toward each other and fixed on the concrete floor.

[0098] In this scheme, the beam-column node is where the beams and columns in the front, back, left and right directions meet. The flanges and webs of the beams and columns divide the space here into several irregular small areas, which increases the difficulty of installing the assembled fireproof concrete layer at the beam-column node. Therefore, during construction, fireproof concrete blocks of different sizes should be used to fill these irregular small areas respectively to form a neat structural external interface, and then the U-shaped segmental fireproof concrete layer and regular fireproof concrete blocks should be installed and attached to the beams and columns near the beam-column node.

[0099] Based on the above, this scheme also proposes a method for constructing a fireproof concrete layer prefabricated structure at the joint of a steel structure beam and column, which includes:

[0100] S01, install fireproof concrete blocks at the bottom of the steel column, wherein the topmost fireproof concrete block presses against the lower flange of the steel beam above it, and when there is a gap between the two, fill the gap with cement mortar 18;

[0101] S02. Apply cement mortar with a thickness of about 10 mm on the top surface of the topmost fireproof concrete block and the top surface of the lower flange of the steel beam for leveling; then apply a layer of cement mortar on the corresponding web side and flange side of the steel beam and steel column in the node area, and fill the node area with regular fireproof concrete blocks to form a neat structural external interface. At the same time, the filled fireproof concrete blocks cover the steel in the node area to achieve a fireproof effect;

[0102] S03. Set up formwork on the steel beam and pour concrete floor slab;

[0103] S04. Install the upper protruding section of the U-shaped segment fireproof concrete layer on the outer side of the steel beam near the node area;

[0104] S05. Apply cement mortar on the concrete floor surface to level it, and then start installing the fireproof concrete layer on the steel column.

[0105] Due to the various forms of steel structures in buildings, it is impossible to list all the embodiments of the fireproof concrete layer assembly construction method. The above embodiments only illustrate the common I-shaped cross-section beam and column components and the column foot and beam-column node assembly construction steps. The main idea is to prefabricate and cast fireproof concrete blocks with multiple internal cavities according to the specific outer contour shape of the steel component. The internal cavity can fit the protruding part of the outer surface of the steel component (such as stiffening ribs, bolts, etc.), fit the fireproof concrete block to the steel component, and use cement mortar to apply and bond it or use hanging rods to suspend and install it.

[0106] The advantages of this implementation scheme can be summarized as follows:

[0107] 1. It does not increase the weight of prefabricated steel components, nor does it increase the burden of crane lifting force at the construction site;

[0108] 2. The fireproof concrete layer structure is divided into parts, making the construction light and convenient;

[0109] 3. Avoid the honeycomb surface of the fireproof concrete layer of the steel structure;

[0110] 4. Prefabricate fireproof concrete layers (blocks) in batches according to certain size moduli, thus improving production efficiency;

[0111] 5. The assembled fireproof concrete layer can not only achieve the fireproof effect, but also serve as the surface finish of the steel structure;

[0112] 6. Fill the gaps between the assembled fireproof concrete layers (blocks) with cement mortar to form an integral structure of the assembled fireproof concrete layers;

[0113] 7. Use waterproof cement mortar to fill the gaps in the installation channels reserved in the floor slab during the construction process to effectively prevent leakage.

[0114] The above descriptions are only some embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fireproof concrete layer assembly structure at the steel structure beam part, characterized in that: It includes: Steel beams; There are multiple U-shaped segment fireproof concrete layers, the main body of which is made of concrete and has a U-shaped steel frame built in it, the two ends of the steel frame extending upward from the upper end surface of the U-shaped segment fireproof concrete layer, the inner U-shaped open side of the U-shaped segment fireproof concrete layer is inserted into the steel beam by the lower flange of the steel beam, and multiple U-shaped segment fireproof concrete layers are arranged side by side on the steel beam; A concrete floor slab is cast on the upper flange of a steel beam, and its edges extend beyond both sides of the upper flange. The concrete floor slab is provided with through holes which are opposite to the upper protruding sections of the steel skeleton of the U-shaped segment fireproof concrete layer. After the upper protruding sections of the steel skeleton pass upward through the through holes, they are bent toward each other and fixed on the concrete floor slab.

2. The fireproof concrete layer assembled structure at the steel structure beam portion as claimed in claim 1 is characterized in that: The steel beam is an I-beam; The thickness of the U-shaped segment fireproof concrete layer is 50 to 60 mm; The steel bar skeleton is composed of a plurality of U-shaped steel bars arranged at intervals and a plurality of longitudinal steel bars that are welded and fixed to the plurality of U-shaped steel bars; Cement-based caulking agent is also applied to opposite sides of the fireproof concrete layer adjacent to the U-shaped segment.

3. The fireproof concrete layer assembled structure at the steel structure beam portion as claimed in claim 1 or 2, characterized in that: Also includes: The number of transverse steel bars corresponds to the number of fireproof concrete layers in the U-shaped segment. The transverse steel bars are arranged on the upper end surface of the concrete floor slab and are respectively welded to the ends of the steel bar skeleton that are bent toward each other to form welds.

4. A construction method for a fireproof concrete layer assembly structure at a steel structure beam portion, characterized in that: It includes: S01, tying the steel skeleton and placing it in a mold to form a U-shaped segment fireproof concrete layer of preset specifications, and at the same time, making the two ends of the steel skeleton higher than the upper end surface of the U-shaped segment fireproof concrete layer; S02, installing steel beams, pouring concrete floor slabs on the steel beams, and reserving through holes that match the protruding sections of the upper steel skeleton in the fireproof concrete layer of the U-shaped segment; S03, inserting the inner U-shaped open side of the U-shaped segment fireproof concrete layer into the steel beam through the lower flange of the steel beam, and at the same time, passing the two ends of the steel skeleton upward through the through-holes, bending them toward each other and fixing them on the concrete floor slab, and then welding and fixing them through transverse steel bars, and fixing the two bent ends of the steel skeleton through the welds formed by welding; S04, applying cement mortar on the side of the U-shaped segment fireproof concrete layer, and then repeating S03 to S04 to arrange multiple U-shaped segment fireproof concrete layers side by side on the steel beam; S05. Fill the through holes on the concrete floor slab with waterproof cement mortar, and apply cement-based caulking agent on opposite sides of adjacent U-shaped segments.

5. A steel structure steel column, a fireproof concrete layer assembly structure at the column foot, characterized in that: It includes: Steel column, which is I-beam; A bottom plate, fixedly connected to the column foot of the steel column, and the bottom plate is provided with a plurality of reinforcing ribs; A connecting assembly is arranged on the base plate and is used to assist in installing the base plate; There are multiple fireproof concrete blocks, which are assembled and laid on the lower part of the steel column and surround and cover the connection between the steel column and the bottom plate.

6. The assembled structure of steel columns and fireproof concrete layers at column bases of the steel structure as claimed in claim 5, characterized in that: The connecting assembly includes bolts, nuts and washers, and the bottom plate is provided with mounting holes for the bolts to pass through; The fireproof concrete block corresponds to the reinforcing ribs and the connecting components on the bottom plate and is provided with contoured avoidance grooves with structures adapted thereto.

7. A method for constructing a steel structure steel column and a fireproof concrete layer assembly structure at the column foot, characterized in that: It includes the following steps: S01. According to the shape of the column foot of the steel column, a mold for making a fireproof concrete block is set thereon, and concrete is poured to form the mold, and then demoulding is performed to obtain a prefabricated fireproof concrete block; S02. Apply a layer of cement mortar on the bottom plate surface of the column foot area, the side of the steel column, the side of the stiffening rib, and the internal contact surface of the fireproof concrete block. Then fit the prefabricated fireproof concrete block on the bottom plate surface, and simultaneously complete the installation and matching of the side of the steel column and the side of the stiffening rib, so that the stiffening ribs, bolts, nuts, gaskets and other components are just inserted into the cavity of the fireproof concrete block. After the cement mortar hardens, the fireproof concrete block is firmly installed in the column foot area.

8. A fireproof concrete layer assembled structure at the joint of a steel structure beam and column, wherein the joint of the steel structure beam and column comprises a steel column and at least one steel beam connected to the side of the steel column, characterized in that: It includes: Fireproof concrete blocks are filled on both sides of the web of steel columns and / or steel beams with cement mortar and abut against the flanges of corresponding steel columns and / or steel beams; The U-shaped segment fireproof concrete layer is multiple in number and 50-60 mm thick. The main body is made of concrete and has a U-shaped steel frame built in. Both ends of the steel frame extend upward from the upper end surface of the U-shaped segment. The inner U-shaped open side of the U-shaped segment fireproof concrete layer is inserted into the steel beam by the lower flange of the steel beam, and multiple U-shaped segment fireproof concrete layers are arranged side by side on the steel beam. A concrete floor slab is cast on the upper flange of a steel beam, and its edges extend beyond both sides of the upper flange; the concrete floor slab is provided with through holes corresponding to the upper protruding sections of the steel skeleton of the U-shaped segment fireproof concrete layer, and the upper protruding sections of the steel skeleton pass upward through the through holes and are bent toward each other and fixed on the concrete floor slab.

9. A method for constructing a fireproof concrete layer assembly structure at a steel beam node of a steel structure, characterized in that: It includes: S01. Install fireproof concrete blocks at the bottom of the steel column, wherein the topmost fireproof concrete block presses against the lower flange of the steel beam above it, and when there is a gap between the two, fill the gap with cement mortar; S02. Apply cement mortar with a thickness of about 10 mm on the top surface of the topmost fireproof concrete block and the top surface of the lower flange of the steel beam for leveling; then apply a layer of cement mortar on the corresponding web side and flange side of the steel beam and steel column in the node area, and fill the node area with regular fireproof concrete blocks to form a neat structural external interface. At the same time, the filled fireproof concrete blocks cover the steel in the node area to achieve a fireproof effect; S03. Set up formwork on the steel beam and pour concrete floor slab; S04. Install the U-shaped segment fireproof concrete layer on the outside of the steel beam near the node area; S05. Apply cement mortar on the concrete floor surface to level it, and then start installing the fireproof concrete layer on the steel column.

10. A steel structure fireproof concrete layer assembled structure, characterized in that: It includes the fireproof concrete layer assembled structure at the steel structure beam part as described in any one of claims 1 to 3, or the fireproof concrete layer assembled structure at the steel structure steel column and column foot part as described in any one of claims 5 to 6, or the fireproof concrete layer assembled structure at the steel structure beam-column node part as described in claim 8; Alternatively, it is obtained by one of the construction method of the fireproof concrete layer prefabricated structure at the steel structure beam site as described in claim 4, the construction method of the fireproof concrete layer prefabricated structure at the steel column and column foot site as described in claim 7, and the construction method of the fireproof concrete layer prefabricated structure at the steel structure beam-column node site as described in claim 9.

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