CN116163471B - Steel-concrete beam, manufacturing method, installation node thereof and node construction method - Google Patents

Steel-concrete beam, manufacturing method, installation node thereof and node construction method Download PDF

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Publication number
CN116163471B
CN116163471B CN202310218446.0A CN202310218446A CN116163471B CN 116163471 B CN116163471 B CN 116163471B CN 202310218446 A CN202310218446 A CN 202310218446A CN 116163471 B CN116163471 B CN 116163471B
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Prior art keywords
steel
concrete
steel box
wing plate
box
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CN116163471A (en
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李刚
谈忠坤
宋小金
易鑫
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Hunan Huacheng Testing Technology Co ltd
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Hunan Huacheng Testing Technology Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G19/00—Auxiliary treatment of forms, e.g. dismantling; Cleaning devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention discloses a reinforced concrete beam, a manufacturing method and a node mounting and node construction method thereof, and solves the problems that the existing reinforced concrete frame beam is heavy in weight and cannot implement assembly construction. The steel-concrete beam can also be called as a steel box beam or a steel box concrete beam, and the beam structure comprises two major combined elements of a steel box and a concrete shell, wherein the steel box is of a hollow structure consisting of a main body section and a mounting section, and the inside of the steel box is filled with light foaming materials; and waist ribs, stirrups and straight ribs are arranged in the concrete shell. The steel box of the technology is externally coated with the shell of the steel-concrete structure and the inner cavity is filled with the foam, so that the inner surface and the outer surface of the steel box do not need to be subjected to corrosion prevention treatment independently, and the aim of reducing dead weight is fulfilled.

Description

Steel-concrete beam, manufacturing method, installation node thereof and node construction method
Technical Field
The invention relates to the technical field of steel reinforced concrete frame beams and construction thereof, in particular to a steel-concrete beam with a novel structure and manufacturing and construction technologies thereof.
Background
The beam as the main member of the horizontal building may be divided into steel beam and reinforced concrete beam according to the forming process, and the steel beam may be also divided into I-beam, steel box beam, light steel beam, etc. with anticorrosive paint to coat the outer side for anticorrosive effect.
The steel beam and the reinforced concrete beam have advantages and disadvantages, for example, the construction speed of the steel beam is far higher than that of the reinforced concrete beam, the anti-seismic performance is better than that of the reinforced concrete beam, but the rigidity and the bending resistance of the steel beam are poorer than those of the reinforced concrete beam.
Based on the advantages and disadvantages of the two beams, a novel steel-concrete frame beam implementation technology appears in the industry, for example, CN207892030U discloses a steel reinforced concrete frame beam hanging die pouring construction structure which comprises prefabricated steel, a reinforcing steel bar net, a template and a hanging connecting piece, wherein the template comprises a beam side template and a beam bottom template; the prefabricated section steel is I-shaped steel, the prefabricated section steel is fixed on a site to be constructed through support columns at two sides, a reinforcing mesh is welded and fixed at the periphery of the prefabricated section steel, screw connecting seats at two sides of the prefabricated section steel are connected with one end of a counter-pulling screw, the counter-pulling screw is sleeved with a limit sleeve, and the other end of the counter-pulling screw penetrates through a beam side template and is locked and fixed with a main ridge at the outer side face of the beam side template through a nut; and the upper fixing brackets are fixedly connected with the corresponding lower fixing brackets through the suspension connecting pieces, the upper supporting beam bottom templates are supported on the lower fixing brackets, a pouring cavity is formed by combining the beam bottom templates with the two beam side templates, and concrete materials are poured into the pouring cavity, so that the construction of the steel reinforced concrete frame beam is completed. The technology adopts site construction molding, and the molded structure is shown in fig. 1, and compared with the traditional reinforced concrete beam, the structure has a plurality of performances such as earthquake resistance, compression resistance, bending resistance, fire resistance, moisture resistance and the like. Therefore, there is a very important application market.
However, the unit has the following problems in the implementation process:
In the steel concrete frame beam shown in fig. 1, more than 90% of the space is occupied by C45 concrete, and the concrete density is high, so that the self weight is high, more than twice of the self weight of the steel structure beam, and the steel structure beam is necessary to be designed and constructed in a light weight manner. The light weight design is one of the main indexes of the current design, and the light weight design is to reduce the weight as much as possible on the premise of meeting the basic building strength.
Secondly, a series of steps such as hoisting are used in the construction process, in-situ casting construction is needed, the construction of large-scale scaffolds and casting templates is needed to be erected in the current casting process, the process is high-altitude operation, and the risk and the cost are high, which is contrary to the currently advocated assembly type construction technology, so that a novel beam structure which can adapt to the assembly type rapid construction process is needed to be designed, and a solution is provided.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a reinforced concrete beam, an installation node and a construction method thereof, solves the problems that the existing reinforced concrete frame beam is heavy in weight and cannot implement assembly construction, provides a high-strength reinforced concrete beam with assembly construction characteristics and light weight, and provides a preliminary manufacturing scheme of the reinforced concrete beam.
The technical scheme adopted for solving the technical problems is as follows:
The steel-concrete beam can also be called as a steel box beam or a steel box concrete beam, and the beam structure comprises two combined elements of a steel box and a concrete shell, and the invention main points of the two combined elements are respectively described.
The middle main body section of the steel box is a hollow structure with a rectangular cross section, the cross section of the hollow structure is composed of an upper wing plate, a lower wing plate and two webs, the mounting sections at the two ends of the steel box are pi-shaped sockets with pi-shaped cross sections, the effective length of the mounting sections is not less than 40cm, the hollow structure is divided into three parts by two symmetrically arranged partition plates, wherein the hollow structures at the two ends are filled with high-strength quick-setting concrete blocks, and the hollow structures in the middle are filled with light foaming materials; at least one threaded hole is formed in the upper wing plate of the pi-shaped socket, and a jacking bolt is arranged in the threaded hole;
The concrete shell is covered on the outer side of the main body section, the thickness of the concrete shell is not lower than 5cm, the optimal thickness is between 8cm and 10 cm, the strength and the fireproof performance are considered, the space ratio of the steel box and a hollow structure covered by the steel box in the beam section is not lower than 60%, and the concrete shell is provided with waist bars, stirrups and straight bars, wherein the waist bars are welded and fixed on the steel box, the straight bars are bound on the waist bars and are arranged along the length direction of the steel box, two ends of the straight bars extend to the mounting section and at least occupy one third of the length of the mounting section, and the stirrups are multiple and are enclosed on the periphery of the steel box, so that the waist bars, the stirrups and the straight bars are bound into a steel bar cage;
and the end surfaces of the two ends of the concrete shell in the length direction are chiseled surfaces.
Further, the wing plate side edges in the steel box extend to the outer sides of the webs.
Further, the lightweight foaming material is one of polyphenyl foaming particles, polyphenyl foaming materials or foaming cement.
Further, the cement used in the concrete housing is one of the series numbered C25 to C35.
A method for manufacturing a steel-concrete girder, which is carried out in a prefabricated field, characterized in that,
S1, welding a steel box, carrying out laser cutting and blanking on a web plate and a wing plate according to the drawing size, and welding a main web plate between an upper wing plate and a lower wing plate, wherein the two ends of the upper wing plate are aligned with the two ends of the main web plate, the lower wing plate is arranged in the middle, welding is carried out by adopting double-sided welding, welding slag is removed after the welding is finished, the vertical relation between the upper wing plate, the lower wing plate and the main web plate is kept in the welding process, then, the auxiliary web plate and the main web plate are arranged in parallel, the two ends of the auxiliary web plate are aligned, and single-sided welding is carried out outside the auxiliary web plate; the two ends of the lower wing plate are used as the reference to translate at least 20 cm into the steel box placing a partition plate and firmly welding the periphery of the partition plate with the wing plate and the inner wall of the web plate;
S2, injecting a light foaming material into the hollow structure of the box body through an injection opening on the partition board, wherein the light foaming material has fluidity until the partition board on the other side is discharged by continuous light foaming material, plugging the injection opening and the exhaust opening on the partition board, and removing redundant light foaming material on the outer side of the partition board; then filling high-strength quick-setting concrete on the outer side of the partition board, and curing for 24 hours after the completion;
s3, welding waist ribs on the outer side of the box body, binding straight ribs and stirrups, hoisting the box body and the reinforcement cage attached to the outer side into a prefabricated formwork after binding is completed, arranging cushion blocks to enable the steel box to be kept at a relatively fixed position in the prefabricated formwork, pouring concrete, and removing the formwork after curing until the steel box is qualified;
S4, roughening the end faces of the two ends of the concrete shell in the length direction after removing the die.
The steel-concrete beam installation node comprises a steel-concrete beam and a steel-concrete column, and brackets are fixedly arranged on the steel-concrete column, which is characterized in that,
The steel-concrete beam comprises a steel box and a concrete shell, wherein the middle main body section of the steel box is a hollow structure with a rectangular cross section and composed of an upper wing plate, a lower wing plate and two webs, the mounting sections at the two ends of the steel box are pi-shaped sockets composed of the upper wing plate and the two webs, the effective length of the mounting sections is not less than 40 cm, the hollow structure is divided into three parts by two symmetrically arranged partition plates, wherein the hollow structures at the two ends are filled with high-strength quick-setting concrete blocks, and the hollow structures in the middle are filled with light foaming materials; at least one threaded hole is formed in the upper wing plate of the pi-shaped socket, and a jacking bolt is arranged in the threaded hole in a penetrating mode;
The outer side of the main body section is covered with a concrete shell, the lowest thickness of the concrete shell is not lower than 5 cm, the optimal thickness is between 8 cm and 10 cm, the strength and the fireproof performance are considered, the space ratio of the steel box and a hollow structure covered by the steel box in the beam section is not lower than 60%, and waist bars, stirrups and straight bars are arranged in the concrete shell, wherein the waist bars are welded and fixed on the steel box, the straight bars are bound on the waist bars and are arranged along the length direction of the steel box, two ends of the straight bars extend to the mounting section and at least occupy one third of the length of the mounting section, and the number of the stirrups is multiple, and is enclosed on the periphery of the steel box, so that the waist bars, the stirrups and the straight bars are bound into a steel bar cage;
and the end surfaces of the two ends of the concrete shell in the length direction are chiseled surfaces;
The pi-shaped jack is inserted into the bracket and sleeved with the sliding die sleeve, the end part of the steel-concrete beam is in non-contact fit with the steel-concrete column and has a gap of at least 3 cm, and high-density micro-expansion mortar is arranged in the gap among the pi-shaped jack, the bracket and the sliding die sleeve to form a rigid connection area, and the strength of the rigid connection area is larger than that of the steel-concrete beam main body.
The construction method of the steel-concrete beam node is characterized by comprising the following steps of:
step S1, hanging the steel-concrete beam above a to-be-installed point through a crane, slowly lowering the height of the steel-concrete beam, enabling pi-shaped sockets at two ends to be in butt joint with brackets, and finely adjusting the state and the position of the steel-concrete beam through adjusting a jack bolt on an upper wing plate of the pi-shaped socket;
S2, grouting, namely sliding the slip form sleeve along the length direction of the reinforced concrete beam until the end part is tightly attached to the reinforced concrete column, fixing the slip form sleeve by using a wedge-shaped locking block, grouting into a grouting space from a grouting opening below the slip form sleeve through grouting equipment after the slip form sleeve is installed in place until a slurry discharge opening at the top of the slip form sleeve is continuously and stably discharged;
And S3, after the curing is qualified, the grouting slurry is solidified, the pi-shaped socket and the bracket are fixed into a whole, the wedge-shaped locking block is removed, and the sliding mode sleeve does not need to be removed.
Further, each sliding mode sleeve is correspondingly provided with four wedge-shaped locking blocks, correspondingly, the side face of the concrete shell of the steel-concrete beam is provided with four wedge-shaped grooves, and the wedge-shaped grooves are gradually wedge-shaped from the middle of the beam to two ends and are matched with the wedge-shaped locking blocks.
Further, three thick steel plates are arranged in the reinforced concrete column in a penetrating mode, the thick steel plates are arranged vertically and are separated by 3-5 cm, steel pins are arranged among the three thick steel plates, the thick steel plates are welded with the reinforced concrete column after passing through the steel pins, and brackets which are symmetrically arranged are formed after welding.
The beneficial effects of the invention are as follows:
By implementing the technology, the polyphenyl foam body in the steel box concrete frame beam approximately occupies one third to one fourth of the section space, so that the dead weight of the steel box concrete frame beam is reduced by about one fourth on the original basis, and the light-weight target is realized. And the bending strength of the steel box girder is also enhanced by adopting the structural design of the double webs, wherein the steel amount is basically kept unchanged by replacing one thick web with two thin webs.
The periphery of the steel box is coated with the shell of the steel-concrete structure, and the inner cavity is filled with the foaming body, so that the inner surface and the outer surface of the steel box do not need to be subjected to corrosion prevention treatment independently.
The steel-concrete beam structurally adopts prefabricated components, and is subjected to hoisting and grouting secondary quick connection on a construction site, so that the construction technology can be used for quick assembly construction without electric welding.
The node after construction has high rigidity and strength, and the connection strength at the node is high in reliability due to the strength of the beam main body.
The mounting difficulty is reduced, and the technology realizes the mounting through the grouting connection technology when a large mounting error exists between the beam and the bracket, such as a lateral or height direction error exists.
Drawings
Fig. 1 is a cross-sectional view of a prior art steel concrete girder.
Fig. 2 is a cross-sectional view of a steel concrete girder according to the present invention.
Fig. 3 is a perspective view of a reinforced concrete girder according to the present invention.
Fig. 4 is a partial configuration view of fig. 3.
Fig. 5 is a horizontal cross-sectional view of the steel concrete beam midline of the present invention.
Fig. 6 is a perspective view of the steel box.
Fig. 7 is a horizontal cross-sectional view of a steel box column.
Fig. 8 is a perspective view of a steel box column.
Fig. 9 is a schematic view showing a process of inserting the mounting section of the steel box girder into the bracket.
FIG. 10 is a schematic view of the sliding of the slipform sleeve to the mounting segment.
Fig. 11 is a schematic diagram of grouting operation of the grouting space inside the slipform cover after the steel-concrete beam is installed in place.
Fig. 12 is a schematic view of the steel concrete beam after installation.
Fig. 13 is a horizontal cross-sectional view of a mounting node.
Fig. 14 is a vertical cross-sectional view of the mounting node.
Fig. 15 is a schematic cross-sectional view of a steel concrete girder in the second embodiment.
Fig. 16 is a cross-sectional view of a reinforced concrete composite beam in accordance with the third embodiment.
In the figure:
100 steel box, 110 steel box inner cavity, 120 partition boards, 130 high-strength anti-shear block, 140 slide die sleeve,
200 Main body section, 210 upper wing plate, 220 lower wing plate, 230 web,
300 Mounting section, 310 jack bolts, 320 pi shaped sockets,
A foam body of 400 a, wherein the foam body is formed by a foam body,
500 Concrete shell, 510 waist bars, 520 stirrups, 530 straight bars, 531 straight bar connecting sections, 540 wedge-shaped grooves, 550 wedge-shaped locking blocks,
600 Grouting space, 610 grouting port, 620 slurry discharge port,
700 Steel box columns, 710 corbels and 720 steel pins.
Detailed Description
The present embodiment mainly relates to two objects, namely a beam and a column, wherein, according to the coordinate state of a building, the up-down direction refers to the gravity direction, namely the vertical direction, and the corresponding column installation direction is the vertical direction, namely the up-down direction, and the beam installation direction is the horizontal direction, namely the vertical direction.
The implementation process and the structural characteristics of the technology are described in detail with reference to fig. 2 to 13 of the specification.
In the first embodiment, the steel-concrete beam adopts a steel box as an inner core, reinforced concrete as an outer shell, and can also be called as a steel box beam, and the steel-concrete beam is described by adopting a structure from inside to outside. And the second dimension is that the section constitution of the steel-concrete beam in different sections along the length direction is different, and the comparative description is adopted.
According to different materials of the components, through analysis, the reinforced concrete beam in the embodiment is of a reinforced concrete structure consisting of a steel box, an internal filler of the steel box and a reinforced concrete shell, wherein the concrete is C25 concrete or C30 concrete, the reinforcement cage is formed by binding waist bars, stirrups and straight bars, and welding fixed points exist between the waist bars and the steel box.
The main structure of the steel box is segmented according to the length direction of the beam, the steel box comprises a main body section and an installation section, wherein the installation section is fixed in length and is positioned at two ends of the length direction of the steel box, and the main body section is a main part of the beam for bearing force. The description is facilitated by the division of the steel box into a main body section and a mounting section.
The steel box 100 spans the installation section 300, the main body section 200 and the installation section 300 along the length direction, and has different installation and expression forms in the main body section and the installation section, wherein the existence of the steel box in the main body section 200 is embodied by the upper wing plate 210, the lower wing plate 220 and the two webs 230, wherein the webs are divided into a main web and a secondary web, and a hollow structure of a square or rectangular structure consisting of the two wing plates and the two webs, the hollow structure is hollow, and polyphenyl particles or polyphenyl foam 400 are filled in the hollow structure, so that the self weight of the beam is reduced. And the steel box itself has stronger stability than the shaped steel (i-steel, angle steel, square tube for example), so the stability of the beam is better.
The steel box is formed by the upper wing plate and two webs in the installation section, and the section is pi-shaped outline.
In this embodiment, the thickness of the two webs 230 is significantly smaller than that of the original web, specifically, the thickness of the main web is about one half of that of the original web, the thickness of the auxiliary web is about one half of that of the original web, both of which and the wing plates form a square or rectangular cross-section structure, the steel box has larger space occupation on a larger cross section, and under the condition that the steel box has the same weight as the original i-steel, the steel box with large space has more excellent bending resistance than the original i-steel and is in a more stable state.
In this embodiment, the thickness of the two flanges is significantly smaller than the thickness of the original i-steel flange, and in particular, the thickness of the flange is about one half of the thickness of the original flange.
The present steel box has a larger duty ratio at the same weight, for example, the space duty ratio of the steel box and its covered inner space in the beam in fig. 2 is around 65%, the duty ratio shown in fig. 15 is around 80%, and by this arrangement the duty ratio of the steel box in the beam is drastically enlarged. The density of the foaming material in the steel box is one percent of that of the traditional C25 concrete, the air in the steel box is discharged through the filling, and the oxygen adsorbent and the drying agent are mixed in the foaming material, so that the corrosion prevention of the steel box in a non-spraying state is realized.
The concrete covers the outer side of the main body section of the steel box to form a protective shell which has the heat insulation function. The outer side is the concrete shell 500 which is uniformly arranged on the outer surface of the steel box girder and is basically designed with equal thickness, the concrete is of a prefabricated structure, and the concrete is molded in a prefabricated field, so that the industrial production can be realized, and the requirements of factory prefabrication and assembly construction are met.
Waist bars 510, stirrups 520 and straight bars 530 are embedded in the concrete shell 500, wherein the waist bars 510 are welded and fixed on the outer surface of the steel box, and are loosely arranged along the length direction of the steel box, for example, the interval is about 0.6 m. The straight bars 530 are bound on the waist bars, so that the straight bars are arranged along the length direction of the steel box through the binding, and then the stirrups are multiple and are enclosed on the periphery of the steel box and are arranged more tightly along the length direction of the steel box, for example, at intervals of 30 cm. The three forms the steel reinforcement cage through the form of ligature, and above-mentioned steel reinforcement cage encloses the outside of closing at the steel tank, forms the overburden of steel reinforced concrete structure with the concrete. The cladding layer of the steel-concrete structure and the steel box form a main body structure of the beam, and the beam is the main body structure of the steel-concrete beam, and has the comprehensive performance advantages of bearing pressure, light dead weight, fire prevention and earthquake resistance.
The waist bar and the stirrup are embedded in the concrete casing 500, the straight bar 530 is mostly embedded in the concrete casing, two ends of the straight bar extend out and at least extend to one third of the installation section to form a straight bar connecting section 531, and optimally, the end part of the straight bar and the installation section are provided with 90-degree bending, so that the holding power with secondary grouting slurry is improved.
In the embodiment, the thickness of the concrete shell is not more than 10 cm, and the effective thickness is not less than 5 cm, so that the dead weight is effectively reduced, and the enough fireproof performance is maintained.
Furthermore, the concrete shell has equal wall thickness around the steel box, and also has unequal wall thickness, for example, the wall thickness of the upper side of the steel box is far greater than that of the other three side walls, so that the characteristic that the concrete is resistant to compression (stress) and not resistant to pulling (stress) is fully exerted.
The covering layer of the steel-concrete structure forms dense protection on the periphery of the steel box and has the anti-corrosion effect. Meanwhile, the covering layer has the heat insulation effect, the open fire resistant effect of the beam main body is obviously improved, and the frame beam can play a positive role when a fire disaster occurs in a building and the safety of the frame beam is endangered.
The covering layer of the steel-concrete structure does not cover the mounting section, and the chiseling is arranged at the vertical interface, so that the combination effect of secondary grouting is improved, and the mounting section is also coated after secondary grouting operation, so that the steel-concrete structure has the advantages of corrosion resistance and fire resistance.
The above-mentioned installation section 300 has a structure different from that of the main section, and the difference between the two is not only reflected in the difference of the steel-concrete coating structure, but also in the steel box structure, wherein in the installation section, the lower wing plate at the lower side of the steel box is omitted in a manner of omitting the design, specifically, the lower wing plate is not arranged outwards at the position 10 cm outside the concrete end face, that is, the overall length of the lower wing plate is smaller than that of the upper wing plate. Thus, in this installation section, the vertical section of the steel box (in the horizontal installation state of the beam) is a pi-shaped section which facilitates the rapid installation of the beam, and for ease of description, this structure is referred to as pi-shaped socket, the action and mechanism of which will be reflected in the installation stage.
The upper wing plate of the installation section 300 is provided with one or two jacking bolts 310, the jacking bolts are vertically installed in threaded holes of the upper wing plate from top to bottom, the lower ends of the jacking bolts are jacked on the bracket, and the horizontal height of the installation section can be slightly adjusted through the jacking bolts, so that the steel-concrete beam is convenient to install. The jacking bolt is auxiliary, after mortar is filled in the inner cavity, the space between the mounting section and the bracket is filled with the mortar, and the stress of the jacking bolt is improved and reduced.
After the mounting section is matched with the bracket in a clamping way, at least one gap of 3 cm is formed between the end part of the mounting section and the steel box column, and the existence of the gap enables mortar to form a possible flow path. That is, there is non-laminating structure between installation section tip and the steel case post, and the mortar fills the back, does not laminate between installation section and the steel case post, does not have direct contact between the two, and this structure can also reduce the heat conduction between the beam column.
In the steel box girder, in order to ensure the sealing and stability of the foaming material, the partition plates 120 are fixed at two ends of the inner cavity 110 of the steel box, and the area between the two fixed partition plates is a foaming material filling space, and the foaming material is filled in the inner part. And a space with the length of about 10 cm to 20 cm is reserved at the outer side of the partition plate, high-strength quick-setting concrete is filled in the space to form a high-strength shearing-resistant block 130, and the high-strength shearing-resistant block 130 spans part of the installation section and the main body section and locally strengthens the steel box to improve local strength.
A specific and detailed embodiment:
The specific steel box girder manufacturing process is as follows: firstly, welding a main web between an upper wing plate and a lower wing plate, enabling the main web to be close to the left side, adopting double-sided welding, removing welding slag, and keeping the vertical relation between the upper wing plate and the lower wing plate and the main web in the welding process. And then, arranging the auxiliary web plate and the main web plate in parallel, arranging the auxiliary web plate and the main web plate at the right side positions of the upper wing plate and the lower wing plate, enabling the main web plate and the auxiliary web plate to be opposite and parallel, and adopting a single-sided penetration welding process to the auxiliary web plate at the outer side to finish welding of the auxiliary web plate and the upper wing plate and the lower wing plate. And welding the partition board, wherein the welding position of the partition board is positioned at the dividing line of the mounting section and the main body section and is shifted to the position of at least 20 cm in the main body section, so that the periphery of the partition board is respectively welded with the wing plate and the web plate. The separator is provided with a foaming material injection port or an exhaust port. After welding, putting a drying agent into the hollow structure formed by the two wing plates and the two webs, standing for a plurality of hours, and finally filling polyphenyl particles or polyphenyl foam bodies into the inner cavity of the main body section between the two partition plates through foaming equipment to compactly fill, wherein in the filling process, the air in the hollow structure is discharged.
The overall length of the lower wing plate is smaller than that of the upper wing plate, and the lower wing plate is arranged in the middle, so that pi-shaped insertion holes are formed in the two ends of the steel box, and the pi-shaped insertion holes are used for realizing quick insertion with brackets and initial positioning.
Binding of the reinforcement cage is then carried out and the steel box with the bound reinforcement cage is placed in a casting mould box, for example by arranging a spacer block, so that the steel box is kept in a relatively fixed position in the mould box, and casting of the C25 concrete is then carried out. After the die is removed, the profile of the formed steel-concrete beam is as shown in fig. 3.
The main body section of the steel box girder has a flat outer elevation, is rectangular as a whole, and has no obvious difference from the traditional precast girder in appearance. Generally, the beam is sized in height to be larger than horizontal in order to have a sufficiently small deflection and a high resistance to bending.
Further, the steel box girder has wedge grooves 540 formed at both ends thereof near the side of the concrete casing 500 at the interface position of the installation section and the main body section, the wedge grooves being formed in a gradually wedge-shaped pattern from the middle of the girder toward both ends and being engaged with wedge-shaped locking blocks 550 for the fixation of the slip-on sleeve.
The above-described process is performed in a prefabricated part factory.
The above-mentioned slip-form sleeve is a thin iron sheet template with rectangular annular profile and attached to the steel box girder of the main section, and the moving mode is sliding, so that the thin iron sheet template is defined as a slip-form sleeve 140, and the thin iron sheet template only plays a role in the installation stage and is used as an external template in the grouting process, which will be described in detail in the specific construction stage.
An exhaustive construction process comprises the following steps: first, the installation process designs a steel box column on which brackets are installed, and in this embodiment, as an exemplary property, the brackets are of a penetrating design, specifically, three thick steel plates are penetrated in the steel box column 700, and the thick steel plates are vertically arranged at intervals of 3 to 5 cm. The three thick steel plates are arranged one by one, the thick steel plates are welded with the steel box columns after passing through the thick steel plates, and brackets 710 which are symmetrically arranged are formed after welding.
In the bracket, steel pins 720 are arranged among the three thick steel plates, and the bracket is connected into a whole by the steel pins. The bracket is matched with pi-shaped jacks with pi-shaped cross sections at two ends of the steel box girder, specifically, the mounting section of the steel box girder is inserted into the bracket from top to bottom, and the steel box girder is leveled and finely adjusted through the adjusting bolts on the mounting section.
In the process, the steel box girder is hoisted to a proper height by using hoisting equipment for cooperation operation, and the two ends of the steel box girder are installed.
After the steel box girder is installed in place, the sliding die sleeve on the steel box girder slides and moves to the installation section, the length of the sliding die sleeve in the girder length direction is obviously larger than that of the installation section, the sliding die sleeve and the installation section are enabled to be partially overlapped, and the installation of the sliding die sleeve is enabled to be convenient due to the partial overlapping. A wedge-shaped groove is arranged on the concrete side surface of the steel box girder and at the edge of the overlapping area of the sliding die sleeve, and the sliding die sleeve is firmly fixed at the position by the wedge-shaped locking principle of the wedge-shaped block.
After the installation in place, the grouting slurry is constructed to perform grouting operation on the grouting space 600 inside the slip form sleeve. Specifically, the grouting port 610 is located at a low point of the slip-form sleeve, the slurry discharge port 620 is located at a top of the slip-form sleeve, and grouting materials are filled in a gradually climbing manner from bottom to top, so that insufficient grouting compactness and gaps are effectively avoided. And maintaining the pressure after grouting is finished and curing until the steel box girder is hardened, and then, fixedly connecting the two ends of the steel box girder with the steel box column.
The grouting material has micro-expansion performance, such as micro-expansion cement mortar, and has a certain expansion trend in the solidification process of the slurry, and the expansion is favorable for forming expansion stress in the inner cavity, so that the bonding strength of the beam column connecting node is improved.
This connection structure cuts off and forms the fixed connection of parcel state through the inflation mortar that is full of between foretell bracket structure and the installation section, and makes steel sheet, steel nail etc. leak outward, and whole profile is unanimous with the roof beam profile, has better outward appearance, and the construction is accomplished the back, and steel leak outward, need not to mend and do not do anticorrosive technology, accomplish and exempt from anticorrosive treatment.
The sliding die sleeve does not need to be disassembled.
When the construction process requires form removal, the form can be effectively removed.
The beam column installation node structure formed by construction is as follows:
The steel-concrete beam comprises a main body section in the middle and mounting sections at two ends, wherein pi-shaped sockets 320 of the mounting sections are inserted into brackets, self-limiting of the mounting sections is realized through upper wing plates of the mounting sections and webs at two sides, high-density micro-expansion mortar is grouted in the space among the pi-shaped sockets, the brackets and the slip form sleeve, and after maintenance, the mortar is solidified and fixes the pi-shaped sockets and the brackets into a whole.
In combination with fig. 13 and 14 of the specification, in the joint, a pi-shaped socket (the end part of the steel box), a bracket formed by vertical plates and high-density mortar are arranged in the section of the installation section to form a rigid connection area, and the rigid connection area is connected to form an integrated structure. The grouting connection construction process enables a rigid connection point to be formed between the beams and the columns, the connection point is provided with an overlapping area in the length direction, the local strength is obviously improved, the local strength is obviously larger than that of the beam main body, when an earthquake occurs, the beam main body participates in energy consumption, and the fracture damage of the connection point is effectively avoided.
In the construction process of the installation node, electric welding operation and undefined fire are not used, damage to the surface of steel is avoided, and the secondary anti-corrosion treatment process is omitted after the installation is completed.
In the construction process, the installation node is connected without steel rivets, and compared with the steel rivet connection process, the grouting process has more flexible convenience, more excellent weather resistance and no corrosion damage.
Example two
According to the lightweight steel-concrete beam, polyurethane foam materials or similar foam materials are filled in a steel box along the length direction of the beam, and oxygen adsorbents are mixed in the foam materials, so that the foam materials are beneficial to supplement the inner space of the steel box to form inner coverage and isolate oxygen to form anti-corrosion filling; coating concrete on the outer side of the steel box, and arranging waist bars, stirrups and straight bars in the concrete, wherein the waist bars are welded on the four directions of the steel box and are perpendicular to the surface of the steel box, and binding the straight bars on the waist bars, wherein the straight bars are respectively arranged along the length direction of the beam, extend to the mounting section and at least cover one third of the length of the mounting section, and are reasonably bent; the waist bar, the stirrup and the straight bar are made of screw thread steel with a small specification; the profile covered by the section of the steel box has a proportion of 80% in the section of the reinforced concrete beam, and referring to fig. 15, the steel box in this embodiment has a larger section, and the light weight effect is more obvious.
Example III
Referring to fig. 16, the steel-concrete beam is represented by a laminated beam, that is, this embodiment illustrates a production process of the technology in the laminated beam.
In the structure, the beam is modified according to the production requirement of the laminated beam, so that the technology can be applied to the production of common precast beams and can also be applied to the production of the laminated beam.
A construction process of a laminated beam is characterized in that on the basis of the construction of the first embodiment, a laminated slab is put on the upper side of the laminated beam, and reinforcement binding and cast-in-place concrete pouring are carried out on the laminated beam and the laminated slab to form a cast-in-place layer.
The above examples are provided for illustrating the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and those skilled in the art should not depart from the spirit of the present invention in all kinds of modifications and improvements that fall within the scope of the present invention as defined in the appended claims.

Claims (8)

1. Steel-concrete roof beam, including steel case and concrete shell, its characterized in that:
The middle main body section of the steel box is a hollow structure with a rectangular cross section, the cross section of the hollow structure is composed of an upper wing plate, a lower wing plate and two webs, the mounting sections at the two ends of the steel box are pi-shaped sockets with pi-shaped cross sections, the effective length of the mounting sections is not less than 40cm, the hollow structure is divided into three parts by two symmetrically arranged partition plates, wherein the hollow structures at the two ends are filled with high-strength quick-setting concrete blocks, and the hollow structures in the middle are filled with light foaming materials; at least one threaded hole is formed in the upper wing plate of the pi-shaped socket, and a jacking bolt is arranged in the threaded hole;
The outer side of the main body section is covered with a concrete shell, the thickness of the concrete shell is not lower than 5 cm, the space ratio of the steel box and a covered hollow structure thereof in the beam section is not lower than 60%, and waist bars, stirrups and straight bars are arranged in the concrete shell, wherein the waist bars are welded and fixed on the steel box, the straight bars are bound on the waist bars and are arranged along the length direction of the steel box, two ends of the straight bars extend to the mounting section and at least occupy one third of the length of the mounting section, and a plurality of stirrups are enclosed on the periphery of the steel box, so that the waist bars, the stirrups and the straight bars are bound into a steel bar cage;
and the end surfaces of the two ends of the concrete shell in the length direction are chiseled surfaces.
2. The steel concrete girder of claim 1, wherein the wing sides in the steel box extend to the outside of the web.
3. The steel-concrete beam of claim 1, wherein the lightweight foam material is one of a polyphenyl foam material or a foam cement.
4. The steel concrete girder according to claim 1, wherein the cement used in the concrete shell is one of the series C25 to C35.
5. A method of manufacturing a reinforced concrete beam as claimed in any one of claims 1 to 4, which is carried out in a prefabricated field,
S1, welding a steel box, carrying out laser cutting and blanking on a web plate and a wing plate according to the drawing size, and welding a main web plate between an upper wing plate and a lower wing plate, wherein the two ends of the upper wing plate are aligned with the two ends of the main web plate, the lower wing plate is arranged in the middle, welding is carried out by adopting double-sided welding, welding slag is removed after the welding is finished, the vertical relation between the upper wing plate, the lower wing plate and the main web plate is kept in the welding process, then, the auxiliary web plate and the main web plate are arranged in parallel, the two ends of the auxiliary web plate are aligned, and single-sided welding is carried out outside the auxiliary web plate; the two ends of the lower wing plate are used as the reference to translate at least 20 cm into the steel box placing a partition plate and firmly welding the periphery of the partition plate with the wing plate and the inner wall of the web plate;
S2, injecting a light foaming material into the hollow structure of the box body through an injection opening on the partition board, wherein the light foaming material has fluidity until the partition board on the other side is discharged by continuous light foaming material, plugging the injection opening and the exhaust opening on the partition board, and removing redundant light foaming material on the outer side of the partition board; then filling high-strength quick-setting concrete on the outer side of the partition board, and curing for 24 hours after the completion;
s3, welding waist ribs on the outer side of the box body, binding straight ribs and stirrups, hoisting the box body and the reinforcement cage attached to the outer side into a prefabricated formwork after binding is completed, arranging cushion blocks to enable the steel box to be kept at a relatively fixed position in the prefabricated formwork, pouring concrete, and removing the formwork after curing until the steel box is qualified;
S4, roughening the end faces of the two ends of the concrete shell in the length direction after removing the die.
6. The steel-concrete beam installation node comprises a steel-concrete beam and a steel-concrete column, and brackets are fixedly arranged on the steel-concrete column, which is characterized in that,
The steel-concrete beam comprises a steel box and a concrete shell, wherein the middle main body section of the steel box is a hollow structure with a rectangular cross section and composed of an upper wing plate, a lower wing plate and two webs, the mounting sections at the two ends of the steel box are pi-shaped sockets composed of the upper wing plate and the two webs, the effective length of the mounting sections is not less than 40 cm, the hollow structure is divided into three parts by two symmetrically arranged partition plates, wherein the hollow structures at the two ends are filled with high-strength quick-setting concrete blocks, and the hollow structures in the middle are filled with light foaming materials; at least one threaded hole is formed in the upper wing plate of the pi-shaped socket, and a jacking bolt is arranged in the threaded hole in a penetrating mode;
The outer side of the main body section is covered with a concrete shell, the lowest thickness of the concrete shell is not lower than 5 cm, the space ratio of the steel box and a covered hollow structure thereof in the beam section is not lower than 60%, and waist bars, stirrups and straight bars are arranged in the concrete shell, wherein the waist bars are welded and fixed on the steel box, the straight bars are bound on the waist bars and are arranged along the length direction of the steel box, two ends of the straight bars extend to the mounting section and at least occupy one third of the length of the mounting section, and a plurality of stirrups are enclosed on the periphery of the steel box, so that the waist bars, the stirrups and the straight bars are bound into a steel bar cage;
and the end surfaces of the two ends of the concrete shell in the length direction are chiseled surfaces;
The pi-shaped jack is inserted into the bracket and sleeved with the sliding die sleeve, the end part of the steel-concrete beam is in non-contact fit with the steel-concrete column and has a gap of at least 3 cm, and high-density micro-expansion mortar is arranged in the gap among the pi-shaped jack, the bracket and the sliding die sleeve to form a rigid connection area, and the strength of the rigid connection area is larger than that of the steel-concrete beam main body.
7. The construction method of the steel-concrete beam installation node of claim 6, which is characterized in that:
step S1, hanging the steel-concrete beam above a to-be-installed point through a crane, slowly lowering the height of the steel-concrete beam, enabling pi-shaped sockets at two ends to be in butt joint with brackets, and finely adjusting the state and the position of the steel-concrete beam through adjusting a jack bolt on an upper wing plate of the pi-shaped socket;
S2, grouting, namely sliding the slip form sleeve along the length direction of the reinforced concrete beam until the end part is tightly attached to the reinforced concrete column, fixing the slip form sleeve by using a wedge-shaped locking block, grouting into a grouting space from a grouting opening below the slip form sleeve through grouting equipment after the slip form sleeve is installed in place until a slurry discharge opening at the top of the slip form sleeve is continuously and stably discharged;
And S3, after the curing is qualified, the grouting slurry is solidified, the pi-shaped socket and the bracket are fixed into a whole, the wedge-shaped locking block is removed, and the sliding mode sleeve does not need to be removed.
8. The construction method of the steel-concrete beam installation node according to claim 7, wherein three thick steel plates are penetrated in the steel-concrete column, the thick steel plates are vertically arranged at intervals of 3 to 5 cm, steel pins are arranged among the three thick steel plates, the thick steel plates are welded with the steel-concrete column after penetrating, and brackets which are symmetrically arranged are formed after welding.
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CN108590034A (en) * 2018-05-30 2018-09-28 上海宝冶集团有限公司 Prefabricated hollow formula combination beam

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