Prefabricated steel concrete beam, prefabricated steel concrete combined beam column and production method of prefabricated steel concrete combined beam column

Abstract

The invention relates to a prefabricated steel concrete beam, a prefabricated steel concrete combined beam column and a production method thereof, the prefabricated steel concrete beam comprises a prefabricated U-shaped beam frame body, a U-shaped groove formed by a bottom steel plate and webs on two sides, a beam shell with a cavity formed in the middle and a pouring opening formed in the upper part, and at least one connecting part is arranged between the webs on the two sides; the upper reinforcing profile steel is arranged on the upper end face of the side web and at least covers the upper end face and the outer side face of the side web; the lower reinforced profile steel is arranged on the lower end face of the side web and at least covers the lower end face and the inner side face of the side web; the reinforced connecting section steel is arranged at the upper part of the pouring opening of the beam shell at intervals and is welded between the upper reinforced section steel; the beam end connecting steel plate is arranged on the bottom steel plate, the bottom of the connecting plate is connected with the bottom steel plate, the connecting plate is perpendicular to the bottom steel plate, and the beam end connecting steel plate partially extends out of the outer end of the bottom steel plate, partially extends into the bottom steel plate and is used for being connected with external beams and columns. The device can be assembled and transported on a production line, and is reliable in quality, high in efficiency and low in cost.

Description

Technical Field

[0001] The invention relates to the field of construction, in particular to a prefabricated steel-concrete beam, a prefabricated steel-concrete composite beam column and a production method thereof. Background Art

[0002] Reinforced concrete columns are cost-effective components in building structures, with high compressive strength, large lateral stiffness, excellent fire resistance and low cost.

[0003] Existing cast-in-place reinforced concrete structures all adopt the construction method of installing scaffolding and formwork on site, tying steel bars, and then pouring concrete. It is difficult to accurately position the embedded parts during on-site installation. The embedded plates and anchor bolts must be tied and positioned on site with the steel bars. The on-site construction positioning is difficult, the deviation is large, and the efficiency is low. Since the steel skeleton is not rigid enough to withstand the beam load during the construction phase, the beam installation needs to wait until the column concrete pouring reaches a certain strength before installation, and the construction work is discontinuous. Due to the large deviation of the embedded parts installation, the precast beams (steel beams or precast concrete beams) are often unable to be installed, affecting the construction period and quality.

[0004] This method involves many on-site processes, consumes a large amount of turnover materials, has low efficiency, poor precision, and is difficult to ensure quality. Especially with the current increasing labor costs in the construction market, construction costs have increased dramatically. Summary of the invention

[0005] In order to overcome at least one of the above problems, the present invention provides a prefabricated steel concrete beam, a prefabricated steel concrete composite beam-column and a production method thereof, which can be assembled and transported on a production line with reliable quality, high efficiency and low cost.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a prefabricated steel concrete beam, comprising:

[0007] The prefabricated U-shaped beam frame is composed of a bottom steel plate and two side webs to form a U groove, a cavity in the middle, and a beam shell with a pouring opening on the upper part, which is convenient for pouring concrete to form a composite beam in the later stage. At least one connecting component is provided between the side webs to withstand the lateral force generated by pouring concrete;

[0008] The upper reinforcing steel is arranged on the upper end surface of the side web and covers at least the upper end surface and the outer side surface of the side web;

[0009] The lower reinforcing steel is arranged on the lower end surface of the side web plate and covers at least the lower end surface and the inner side surface of the side web plate;

[0010] Reinforced connection steel sections are arranged at intervals above the pouring opening of the beam shell and welded between the upper reinforcing steel sections;

[0011] The beam end connecting steel plate is arranged on the bottom steel plate. The bottom of the connecting plate is connected to the bottom steel plate and is perpendicular to the bottom steel plate. It has a portion extending out of the outer end of the bottom steel plate and a portion extending into the bottom steel plate for connection with external beams and columns.

[0012] Preferably, the connecting parts include waist reinforcement trusses and at least one group of waist reinforcement tension bars respectively arranged in the side webs, each waist reinforcement truss includes two lower chords and one upper chord, the lower chord is arranged along the length direction of the side web and is fixedly connected to the inner side surface of the side web (or pre-embedded in the concrete of the side web), the upper chord protrudes from the side web, the lower chord and the upper chord are connected or are on both sides of an integrated structure; the waist tension bar hooks the upper chord on the inner side of the two webs to form a knot.

[0013] Preferably, the lower chord is a linear structure embedded in the concrete web; the upper chord is a linear structure continuously welded to the lower chord via regular wavy steel bars.

[0014] Preferably, the side web is made of UHPC ultra-high performance concrete, and the upper end of the web adopts a partially enlarged cross-section; the lower chord reinforcement is pre-embedded in the side web.

[0015] The present invention also provides a prefabricated steel-concrete composite beam-column, comprising a skeleton reinforced concrete column and the above-mentioned prefabricated steel-concrete beam; a column corbel connecting steel frame is arranged on one side of the skeleton reinforced concrete column, and the beam end connecting steel plate of the prefabricated steel-concrete beam and the column corbel connecting steel frame of the skeleton reinforced concrete column are connected and fixed to each other to form a prefabricated steel-concrete composite beam-column.

[0016] Preferably, the skeleton reinforced concrete column comprises:

[0017] A lattice steel frame, wherein the lattice steel frame comprises four column steels and a plurality of connecting webs, wherein the four column steels are longitudinally arranged in parallel to form a lattice frame structure, and connecting webs are arranged between adjacent column steels, so that the lattice steel frame forms a fixed frame;

[0018] Multiple column sections are composed of multiple steel plate hoops, which connect adjacent column steels and cover the four sides of the lattice steel frame to form a closed column section;

[0019] At least one transverse diaphragm, which is arranged in the lattice steel frame and welded to the steel plate hoops of the column section layer, and a through hole is arranged in the middle of the transverse diaphragm so that the space area between each transverse diaphragm is connected to facilitate the pouring of concrete;

[0020] The column corbel connecting steel frame is arranged on at least one side of the lattice steel frame, and includes at least one column corbel web and a column corbel panel and a column corbel bottom plate arranged on the upper and lower ends of the column corbel web. The column corbel web is perpendicular to the side of the lattice steel frame, and the column corbel web is connected to at least two column section layers.

[0021] Preferably, the skeleton reinforced concrete column also includes a secondary skeleton, including a plurality of longitudinally arranged column longitudinal bars, the plurality of steel bars are surrounded by the periphery of the lattice steel skeleton and avoid the embedded plates, and column stirrups are arranged around the column longitudinal bars.

[0022] The present invention also provides a production method for prefabricated steel-concrete composite beams and columns, comprising the following steps:

[0023] 1) Side web production: UHPC ultra-high performance concrete panels of corresponding sizes are produced according to the requirements of length, height and thickness, and waist reinforcement trusses are pre-embedded during production. When used, they can be cut arbitrarily or connected with fiber concrete to the required length;

[0024] 2) Reinforcement steel is installed at the upper and lower ends of the side web, and the reinforcement steel at least covers the upper and lower end surfaces and one side surface of the side web. The upper end surface of the upper reinforcement steel extends toward the middle and has a reserved hole; the upper part of the side web adopts a partially enlarged cross-section method;

[0025] 3) Production of bottom steel plate, cutting to length and / or welding and connection as required;

[0026] 4) Welding of the beam end connecting steel plate: Weld the beam end connecting steel plate on the bottom steel plate so that part of the beam end connecting steel plate extends out of the outer end of the bottom steel plate and part of it extends into the bottom steel plate;

[0027] 5) The side webs are assembled with the bottom steel plate. On the fixed tire frame, the two bottom ends of the side webs are welded to the two sides of the bottom steel plate to form a U-shaped groove structure, a pouring cavity is formed in the middle, and a beam frame with a pouring opening is formed in the upper part;

[0028] 6) Beam stirrup frame: The beam stirrup frame is located at the upper part of the beam frame. The number and spacing of the beam stirrup frame are arranged according to the requirements. The beam stirrups are U-shaped with the opening downward. The beam stirrups are respectively inserted into the reserved holes of the reinforcing steel on the web. Additional steel bars on the beam surface are arranged on the inner side of the upper part of the beam stirrups to form a steel bar skeleton.

[0029] Additional reinforcement on the beam surface, which is located inside the beam stirrups, is used to tie the beam stirrups and the additional longitudinal reinforcement to form a reinforcement skeleton;

[0030] 7) Use waist reinforcement to hook the upper chord steel bars of the embedded waist reinforcement trusses on both sides of the web to bear the tension generated by the pouring of concrete on the lateral web;

[0031] 8) Produce skeleton reinforced concrete columns, connect the beam end connecting steel plate with the column bracket connecting steel frame of the skeleton reinforced concrete column, and the column bracket connecting steel frame and the beam end connecting steel plate are both provided with reserved bolt connection holes, which are connected by bolts or welding; wherein, the column bracket bottom plate is welded to the bottom steel plate of the prefabricated U-shaped beam frame, and the column bracket bottom plate, steel plate hoop and cross diaphragm are welded and connected, so that the bottom steel plate (or steel bar) at the bottom of the beam penetrates the whole frame, so as to achieve the purpose of resisting the vertical and horizontal load effects;

[0032] 9) Install precast floor slabs (composite slabs or reinforced truss slabs or corrugated slabs, etc.), install column formwork, pour column concrete, concrete in the precast beam cavity and slab concrete to form an integral structure.

[0033] Preferably, the additional steel bars on the beam surface in step 6) penetrate into the column section layer of the skeleton reinforced concrete column to form a rigid connection node, and an integral concrete structure is formed after pouring concrete.

[0034] Preferably, in the step 5), a plurality of reinforcing connecting steel sections are welded to the upper part of the webs on both sides to improve the torsional resistance of the beam frame during the construction stage and the reaction force formed by local support. Compared with the prior art, the present invention has the following beneficial effects: a prefabricated steel concrete beam.

[0035] 1) No need for on-site formwork and scaffolding, and the amount of beam reinforcement binding is greatly reduced;

[0036] 2) The beam frame is a prefabricated U-shaped trough component, which is light in weight, easy to transport and install, and low in cost;

[0037] 3) There is little or no temporary support during installation, which saves temporary expenses and shortens the construction period;

[0038] 4) Made in the factory, fast, efficient, precise, and mechanically installed on site;

[0039] 5) Less on-site work and high construction efficiency;

[0040] 6) The overall pouring of beam and slab concrete is good;

[0041] 7) Low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0043] Figure 1 It is a schematic diagram of the overall structure of the prefabricated steel concrete beam of the present invention;

[0044] Figure 2 is a side view schematic diagram of the prefabricated steel concrete beam of the present invention;

[0045] Figure 3 yes Figure 1A simplified schematic diagram of

[0046] Figure 4 It is a structural schematic diagram of the bottom steel plate and the connecting steel plate at the beam end of the prefabricated reinforced concrete beam of the present invention;

[0047] Figure 5 It is a schematic diagram of the side web structure of the prefabricated steel concrete beam of the present invention;

[0048] Figure 6 It is a schematic diagram of the overall structure of the prefabricated steel-concrete composite beam-column of the present invention;

[0049] Figure 7 It is a structural schematic diagram of the skeleton reinforced concrete column of the present invention;

[0050] Figure 8 It is a schematic diagram of the installation implementation of the prefabricated steel-concrete composite beam-column described in the present invention.

[0051] illustrate:

[0052] 1. Prefabricated U-shaped beam frame, 11. Bottom steel plate, 111. Prestressed tendons at the bottom of the beam, 12. Side webs, 13. Upper reinforcing steel, 14. Lower reinforcing steel, 15. Beam end connecting steel plate, 152. Flange plate on connecting plate, 151. Reserved bolt connection holes, 16. Waist reinforcement truss, 161. Lower chord reinforcement, 162. Upper chord reinforcement, 163. Supporting reinforcement inside the chord, 17. Waist reinforcement tension bars, 18. Additional reinforcement on the beam surface, 181. Beam stirrup frame, 19. Strengthening connecting steel.

[0053] 2. Lattice steel frame, 21. Connecting web members, 22. Steel plate hoops, 23. Column corbel connecting steel frame, 231. Column corbel web plate, 232. Column corbel bottom plate, 233. Column corbel panel, 24. Beam bottom partition, 25. Beam surface partition, 26. Column longitudinal reinforcement, 27. Column stirrups, 100. Concrete column. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0057] Example 1

[0058] like Figure 1-5 As shown, the prefabricated steel concrete beam is composed of a prefabricated U-shaped beam frame 1, an upper reinforcing steel 13, a lower reinforcing steel 14, and a beam end connecting steel plate 15. It can be assembled on a production line and transported to a construction site for installation and concrete pouring after assembly. The quality is reliable, which greatly improves production efficiency and reduces costs.

[0059] The prefabricated U-shaped beam frame 1 is a beam frame consisting of a bottom steel plate 11 and webs 12 on both sides, with a middle portion forming a pouring cavity and an upper portion forming a pouring opening; connecting components are installed between the webs to withstand the tension generated by the webs 12 on both sides due to pouring concrete and the beam during the use stage.

[0060] The upper reinforcing steel 13 is arranged on the upper end surface of the side web 12, covering at least the upper end surface and the outer side surface of the side web 12; in this embodiment, the upper reinforcing steel 13 adopts an angle steel structure, the upper end surface is wider than the thickness of the side web 12, extends toward the middle, and has reserved holes for the subsequent installation of other connecting components.

[0061] The lower reinforcing steel 14 adopts an angle steel structure and is arranged on the lower end surface of the side web 12, at least covering the lower end surface and the inner side surface of the side web 12; wherein, the upper reinforcing steel 13, the lower reinforcing steel 14 and the adjacent surfaces of the side web 12 are provided with embedded nails, which penetrate deep into the side web 12.

[0062] In this embodiment, the upper end of the side web 12 is partially enlarged in cross section to provide rigidity during the construction phase and reduce or eliminate the need for temporary support.

[0063] See also Figure 4 The beam end connecting steel plate 15 is arranged on the bottom steel plate 11, connected to the bottom steel plate 11 at the bottom, perpendicular to the bottom steel plate 11, with a portion extending from the end of the bottom steel plate 11 and a portion extending into the bottom steel plate 11, for connecting with external beams and columns, and the extending portion of the beam end connecting steel plate 15 has a reserved bolt connection hole 151. The upper part of the beam end connecting steel plate 15 has a connecting plate upper flange plate 152.

[0064] For details, see Figure 5 The connecting parts include a waist reinforcement truss 16 and at least one group of waist reinforcement 17 respectively arranged in the side web 12. The waist reinforcement truss 16 is composed of a lower chord 161 and an upper chord 162. The lower chord 161 is arranged along the length direction of the side web 12 and is fixedly connected to the inner side of the side web 12. The upper chord 162 protrudes from the side web 12. The lower chord 161 and the upper chord 162 are connected or are an integrated structure on both sides; the waist reinforcement 17 is connected to the upper chord 162 on both sides.

[0065] In one embodiment, the lower chord 161 is a porous mesh or porous plate structure; the upper chord 162 is a spiral or cross-shaped continuous steel wire structure inserted into the holes / net of the lower chord 161 .

[0066] In one embodiment, the lower chord 161 is a linear structure; the upper chord 162 and the lower chord 161 are a linear structure in which the upper chord 162 and the lower chord 161 are continuously welded to each other through regular wavy steel bars.

[0067] In one embodiment,

[0068] The side web 12 is made of UHPC ultra-high performance concrete; the lower chord 161 is pre-embedded in the side web 12 .

[0069] See also Figure 1 , 2 A beam stirrup frame 181 is installed on the upper part of the beam frame, and the number and spacing of the beam stirrup frame 181 are arranged as required. The beam stirrup frame 181 is in a downward open frame shape, so that the two ends of the beam stirrup frame 181 are respectively inserted into the reserved holes of the upper reinforcing steel 13, and additional beam surface steel bars 18 are arranged on the upper and / or lower ends of the beam stirrup frame 181 to form a steel bar skeleton.

[0070] In this embodiment, the additional steel bars 18 on the beam surface are located at the lower part of the beam stirrup frame 181, and are covered and tied by the beam stirrup frame 181 to form a steel bar skeleton.

[0071] Example 2

[0072] like Figure 6As shown, the precast steel-concrete composite beam-column is a precast beam-column combination consisting of a skeleton reinforced concrete column and the precast steel-concrete beam in Example 1; a column corbel connecting steel frame 23 is provided on one side of the skeleton reinforced concrete column, and the beam end connecting steel plate 15 of the precast steel-concrete beam and the column corbel connecting steel frame 23 of the skeleton reinforced concrete column are fixed to each other by welding or bolts to form a precast beam-column combination.

[0073] See also Figure 7 The skeleton reinforced concrete column comprises a lattice steel frame 2, a plurality of column sections, a column bracket connecting steel frame 23, a diaphragm, and a secondary frame. The processing of the skeleton reinforced concrete column can be built at the construction location or assembled on the production line. After assembly, it is transported to the construction site for concrete pouring. Its quality is reliable, which greatly improves production efficiency and reduces costs.

[0074] The lattice steel frame 2 includes four column steels and a plurality of connecting webs 21. The four column steels are longitudinally arranged in parallel to form a lattice frame structure. Connecting webs 21 are arranged between adjacent column steels, so that the lattice steel frame 2 forms a columnar fixed frame.

[0075] A plurality of column segment layers are composed of a plurality of steel plate hoops 22 , and the steel plate hoops 22 connect adjacent column steels and cover the four surfaces of the lattice steel frame 2 to form a closed column segment layer.

[0076] The column corbel connecting steel frame 23 is arranged on at least one side of the lattice steel frame 2, and includes at least one column corbel web 231. The column corbel web 231 is perpendicular to the side of the lattice steel frame 2, and the column corbel web 231 is connected to at least two column section layers.

[0077] At least one transverse diaphragm is arranged in the lattice steel frame 2 and connected to the steel plate hoop 22 of the column layer. A through hole is arranged in the middle of the transverse diaphragm to connect the space area between each transverse diaphragm to facilitate the pouring of concrete.

[0078] The secondary frame includes a plurality of longitudinally arranged column longitudinal bars 26 . The plurality of steel bars are surrounded by the outer edge of the lattice steel frame 2 and avoid the embedded plates. Column stirrups 27 are arranged around the column longitudinal bars 26 .

[0079] Example 3

[0080] Production of prefabricated reinforced concrete beams: includes the following steps,

[0081] 1) Production of side webs 12: UHPC ultra-high performance concrete panels of corresponding sizes are produced according to the requirements of length, height and thickness, and waist reinforcement trusses 16 are pre-embedded during production. When used, they can be cut arbitrarily or connected with fiber concrete to the required length; the webs 12 on both sides can be cut into different heights as needed to meet the installation of stepped floor structures, such as the stepped structure between the sunken balcony and the floor;

[0082] 2) Reinforcement steel is installed at the upper and lower ends of the side web 12, and the reinforcement steel at least covers the upper and lower end surfaces and one side surface of the side web 12. The upper end surface of the upper reinforcement steel 13 extends toward the middle and has a reserved hole;

[0083] 3) Production of bottom steel plate 11, cutting to size and / or welding and connection as required;

[0084] 4) Welding the beam end connecting steel plate 15: Weld the beam end connecting steel plate 15 on the bottom steel plate 11 so that part of the beam end connecting steel plate 15 extends out of the end of the bottom steel plate 11 and part of it extends into the bottom steel plate 11;

[0085] 5) The side webs 12 are assembled with the bottom steel plate 11. On the fixed tire frame, the two bottom ends of the side webs 12 are welded to the two sides of the upper end surface of the bottom steel plate 11 to form a U-shaped groove structure, a pouring cavity is formed in the middle, and a beam frame with a pouring opening is formed in the upper part; if necessary, a plurality of beam bottom prestressed tendons 111 are laid on the bottom steel plate 11;

[0086] 6) Welding a plurality of reinforcing connecting steels 19 on the upper part of the webs 12 on both sides to improve the torsional resistance of the beam frame during the construction stage;

[0087] 7) Beam stirrup frame 181, beam stirrup frame 181, beam stirrup frame 181 is located at the upper part of the beam frame body, the number and interval of the beam stirrup frame 181 are arranged as required, the beam stirrup frame 181 is frame-shaped, so that the two ends of the beam stirrup frame 181 are respectively inserted into the reserved holes of the upper reinforcing steel 13, and additional beam surface steel bars are arranged on the upper and / or lower ends of the beam stirrup frame 181 to form a steel bar skeleton;

[0088] The additional steel bars 18 on the beam surface are located at the lower part of the beam stirrup frame 181 and are covered and tied by the beam stirrup frame 181 to form a steel bar skeleton;

[0089] 8) Use waist reinforcement 17 to connect the embedded waist reinforcement trusses 16 of the webs 12 on both sides to provide supporting tension; specifically, the chord inner support ribs 163 can be inserted into the upper chord ribs 162, and then the waist reinforcement 17 can be clamped into the chord inner support ribs 163 on both sides, and then tied / welded to fix, so as to further improve stability;

[0090] 9) Produce a skeleton reinforced concrete column, connect the beam end connecting steel plate 15 with the column bracket connecting steel frame 23 of the skeleton reinforced concrete column, wherein the column bracket connecting steel frame 23 and the beam end connecting steel plate 15 are both provided with reserved bolt connection holes 151; and connect them into a whole with bolts;

[0091] 10) Install precast floor slabs (composite slabs or reinforced truss slabs or corrugated slabs, etc.), skeleton reinforced concrete columns, and precast steel concrete beams, and cast them simultaneously to form an integral structure.

[0092] Compared with the original technology, the advantages of the present invention are:

[0093] 8) No need for on-site formwork and scaffolding, and the amount of beam reinforcement binding is greatly reduced;

[0094] 9) The beam frame is a prefabricated U-shaped trough component, which is light in weight, easy to transport and install, and low in cost;

[0095] 10) There is little or no temporary support during installation, saving temporary costs and shortening the construction period;

[0096] 11) Made in the factory, fast, efficient, precise, and mechanically installed on site;

[0097] 12) Less on-site work and high construction efficiency;

[0098] 13) The overall pouring of beam and slab concrete is good;

[0099] 14) Low cost.

[0100] Example 4

[0101] The production method of the skeleton reinforced concrete column in this step is as follows:

[0102] 1) A portion of the longitudinal reinforcement of the column is replaced with angle steel / section steel, which is placed at the four column corners to form a steel skeleton, and the connecting web members 21 (straight web members, diagonal web member angle steel, steel plate strips, C-section steel, etc.) are welded to form a frame-shaped steel skeleton, which can bear the vertical load during the construction stage;

[0103] A certain number of small-diameter column longitudinal bars 26 are arranged on the outer periphery of the lattice steel frame 2, and are connected by column stirrups 27 to form an outer frame. Specifically, the lattice steel frame 2 includes four column steels and a plurality of connecting web members 21. The four column steels are longitudinally arranged in parallel to form a lattice frame structure. Connecting web members 21 are arranged between adjacent column steels, so that the lattice steel frame 2 forms a fixed frame.

[0104] 2) Use steel plate hoops 22 to surround the periphery of the frame-shaped steel skeleton to form a column node layer; the steel plate hoops 22 replace ordinary steel hoops for welding to form a closed node skeleton; N pieces (no less than 2 pieces) of steel plate hoops 22 are distributed along the height of the beam, and a certain gap is left between the steel plate hoops 22 to facilitate the concrete inside and outside the node (beam or column) to be connected as a whole.

[0105] 3) The column corbel is connected to the steel frame 23 and installed, and an inverted T-shaped or H-shaped corbel is welded at the vertical centerline outside the column section layer (the corbel bottom plate and top plate are consistent with the width of the connected beam, and the height is consistent with the height of the prefabricated beam). Specifically, the embedded plate is set on one or more sides of the lattice steel frame 2, and is composed of a column corbel web 231, a column corbel panel 233, and a column corbel bottom plate 232. The column corbel web 231 is perpendicular to the side of the lattice steel frame 2, and the column corbel web 231 is connected across at least two column section layers; the column corbel panel 233 and the column corbel bottom plate 232 are respectively connected to the steel plate hoops 22 of different column section layers, forming an "I"-shaped structure.

[0106] 4) A square or rectangular horizontal diaphragm (with a circular hole of not less than 200 mm in the middle for easy pouring of concrete) is arranged at the bottom and top elevations of the beam in the node steel plate hoop 22, and a beam surface diaphragm 25 and a beam bottom diaphragm 24 are formed at the upper and lower ends. The beam surface diaphragm 25 and the beam bottom diaphragm 24 are respectively arranged in the column section layer of the top layer and the column section layer of the bottom layer, and are welded into a whole in the steel plate hoop 22.

[0107] 5) The lattice steel frame, steel plate hoops 22, column corbels, column reinforcements, etc. are manufactured in the factory. The prefabricated beams are H, U, box-shaped, etc. The column frame and steel beams are installed on site. After the column frame (including reinforcement, reinforcement, and connecting corbels) is manufactured, it is installed on site by machinery, and the steel beams are installed and fixed at the same time.

[0108] Compared with the existing technology, the present invention has the following advantages:

[0109] 15) The node structure is simple;

[0110] 16) Made in the factory, fast, efficient, precise, and mechanically installed on site;

[0111] 17) Less on-site work and high construction efficiency;

[0112] 18) During construction, the vertical and lateral stiffness is good and can withstand large construction loads. The horizontal structure does not need to be supported separately, which speeds up the construction.

[0113] 19) The floor slabs and columns are made of cast-in-place concrete, with good overall shape;

[0114] 20) Low cost.

[0115] Example 5

[0116] The installation steps of prefabricated steel concrete composite beams and columns are as follows:

[0117] 1) The skeleton reinforced concrete column is installed on the concrete column body 100, and the column longitudinal reinforcement 26 is extended upward around the circumference of the concrete column body 100 to cover the skeleton reinforced concrete column. The column longitudinal reinforcement 26 is arranged around the circumference of the skeleton reinforced concrete column, and then the column hoop reinforcement 27 is surrounded and tightened to form a whole.

[0118] 2) Align the reserved bolt connection holes 151 of the column bracket connection steel frame 23 of the skeleton reinforced concrete column and the beam end connection steel plate 15 of the prefabricated reinforced concrete beam and tighten the installation bolts, see Figure 6 , 8 , forming Figure 8 Precast steel-concrete composite beams and columns are shown.

[0119] 3) The additional steel bars 18 on the beam surface of the prefabricated reinforced concrete beam pass through the column section layer of the skeleton reinforced concrete column to form a rigid connection node.

[0120] 4) Install the outer frame formwork on site for the skeleton reinforced concrete columns.

[0121] 5) Pour concrete for skeleton reinforced concrete columns.

[0122] 6) The beam surface and floor slab are installed and poured with concrete to form the structure. The precast steel concrete beams and floor slabs are poured with concrete at the same time to form an integral beam-column node.

[0123] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A prefabricated steel concrete beam, characterized in that: include: The prefabricated U-shaped beam frame is composed of a bottom steel plate and two side webs to form a U groove, a cavity in the middle, and a beam shell with a pouring opening on the upper part, which is convenient for pouring concrete to form a composite beam later; at least one connecting component is provided between the side webs to withstand the lateral force generated by pouring concrete; The upper reinforcing steel is arranged on the upper end surface of the side web and covers at least the upper end surface and the outer side surface of the side web; The lower reinforcing steel is arranged on the lower end surface of the side web plate and covers at least the lower end surface and the inner side surface of the side web plate; Reinforced connection steel sections are arranged at intervals above the pouring opening of the beam shell and welded between the upper reinforcing steel sections; The beam end connecting steel plate is arranged on the bottom steel plate. The bottom of the connecting plate is connected to the bottom steel plate and is perpendicular to the bottom steel plate. It has a portion extending out of the outer end of the bottom steel plate and a portion extending into the bottom steel plate for connection with external beams and columns.

2. The prefabricated reinforced concrete beam according to claim 1, characterized in that: The connecting parts include waist reinforcement trusses and at least one group of waist reinforcement tension bars respectively arranged in the side webs, each waist reinforcement truss includes two lower chord bars and one upper chord bar, the lower chord bars are arranged along the length direction of the side webs and are fixedly connected to the inner side surface of the side webs, and the upper chord bars protrude from the side webs, and the lower chord bars and the upper chord bars are connected or are on both sides of an integrated structure; the waist tension bars hook the upper chord bars on the inner sides of the two webs to form a knot.

3. The prefabricated reinforced concrete beam according to claim 2, characterized in that: The lower chord is a linear structure, embedded in the concrete web; the upper chord is a linear structure that is continuously welded to the lower chord through regular wavy steel bars.

4. The prefabricated reinforced concrete beam according to claim 2, characterized in that: The side web is made of UHPC ultra-high performance concrete, and the upper end of the web adopts a partially enlarged cross-section; the lower chord is pre-embedded in the side web.

5. A prefabricated steel-concrete composite beam-column, characterized in that: It comprises a skeleton reinforced concrete column and a prefabricated steel concrete beam as described in any one of claims 1 to 4; a column corbel connecting steel frame is arranged on one side of the skeleton reinforced concrete column, and the beam end connecting steel plate of the prefabricated steel concrete beam is connected and fixed to the column corbel connecting steel frame of the skeleton reinforced concrete column to form a prefabricated steel concrete composite beam-column.

6. The prefabricated steel-concrete composite beam-column according to claim 5, characterized in that: The skeleton reinforced concrete column comprises: A lattice steel frame, wherein the lattice steel frame comprises four column steels and a plurality of connecting webs, wherein the four column steels are longitudinally arranged in parallel to form a lattice frame structure, and connecting webs are arranged between adjacent column steels, so that the lattice steel frame forms a fixed frame; Multiple column sections are composed of multiple steel plate hoops, which connect adjacent column steels and cover the four sides of the lattice steel frame to form a closed column section; At least one transverse diaphragm, which is arranged in the lattice steel frame and welded to the steel plate hoops of the column section layer, and a through hole is arranged in the middle of the transverse diaphragm so that the space area between each transverse diaphragm is connected to facilitate the pouring of concrete; The column corbel connecting steel frame is arranged on at least one side of the lattice steel frame, and includes at least one column corbel web and a column corbel panel and a column corbel bottom plate arranged on the upper and lower ends of the column corbel web. The column corbel web is perpendicular to the side of the lattice steel frame, and the column corbel web is connected to at least two column section layers.

7. The prefabricated steel-concrete composite beam-column according to claim 5, characterized in that: The skeleton reinforced concrete column also includes a secondary skeleton, including a plurality of longitudinally arranged column longitudinal bars, the plurality of steel bars are surrounded by the periphery of the lattice steel skeleton and avoid the embedded plates, and column stirrups are arranged around the column longitudinal bars.

8. The method for producing prefabricated steel-concrete composite beams and columns according to claim 6, characterized in that: The steps include: 1) Side web production: UHPC ultra-high performance concrete panels of corresponding sizes are produced according to the requirements of length, height and thickness, and waist reinforcement trusses are pre-embedded during production. When used, they can be cut arbitrarily or connected with fiber concrete to the required length; 2) Reinforcement steel is installed at the upper and lower ends of the side web, and the reinforcement steel at least covers the upper and lower end surfaces and one side surface of the side web. The upper end surface of the upper reinforcement steel extends toward the middle and has a reserved hole; the upper part of the side web adopts a partially enlarged cross-section method; 3) Production of bottom steel plate, cutting to length and / or welding and connection as required; 4) Welding of the beam end connecting steel plate: Weld the beam end connecting steel plate on the bottom steel plate so that part of the beam end connecting steel plate extends out of the outer end of the bottom steel plate and part of it extends into the bottom steel plate; 5) The side webs are assembled with the bottom steel plate. On the fixed tire frame, the two bottom ends of the side webs are welded to the two sides of the bottom steel plate to form a U-shaped groove structure, a pouring cavity is formed in the middle, and a beam frame with a pouring opening is formed in the upper part; 6) Beam stirrup frame: The beam stirrup frame is located at the upper part of the beam frame. The number and spacing of the beam stirrup frame are arranged according to the requirements. The beam stirrups are U-shaped with the opening downward. The beam stirrups are respectively inserted into the reserved holes of the reinforcing steel on the web. Additional steel bars on the beam surface are arranged on the inner side of the upper part of the beam stirrups to form a steel bar skeleton. Additional reinforcement on the beam surface, which is located inside the beam stirrups, is used to tie the beam stirrups and the additional longitudinal reinforcement to form a reinforcement skeleton; 7) Use waist reinforcement to hook the upper chord steel bars of the embedded waist reinforcement trusses on both sides of the web to bear the tension generated by the pouring of concrete on the lateral web; 8) Produce skeleton reinforced concrete columns, connect the beam end connecting steel plate with the column bracket connecting steel frame of the skeleton reinforced concrete column, and the column bracket connecting steel frame and the beam end connecting steel plate are both provided with reserved bolt connection holes, which are connected by bolts or welding; wherein, the column bracket bottom plate is welded to the bottom steel plate of the prefabricated U-shaped beam frame, and the column bracket bottom plate, steel plate hoop and cross diaphragm are welded and connected, so that the bottom steel plate (or steel bar) at the bottom of the beam penetrates the whole frame, so as to achieve the purpose of resisting the vertical and horizontal load effects; 9) Install precast floor slabs (composite slabs or reinforced truss slabs or corrugated slabs, etc.), install column formwork, pour column concrete, concrete in the precast beam cavity and slab concrete to form an integral structure.

9. The method for producing prefabricated steel-concrete composite beams and columns according to claim 8, characterized in that: The additional steel bars on the beam surface in step 6) penetrate into the column section layer of the skeleton reinforced concrete column to form a rigid connection node, and an integral concrete structure is formed after pouring concrete.

10. The method for producing prefabricated steel-concrete composite beams and columns according to claim 8, characterized in that: In the step 5), a plurality of reinforcing connecting steel sections are welded to the upper parts of the webs on both sides to improve the torsional resistance of the beam frame during the construction stage and the reaction force formed by the local support.

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