CN108612189B - Prefabricated UHPC shell local reinforced assembled concrete frame structure - Google Patents
Prefabricated UHPC shell local reinforced assembled concrete frame structure Download PDFInfo
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- CN108612189B CN108612189B CN201810717984.3A CN201810717984A CN108612189B CN 108612189 B CN108612189 B CN 108612189B CN 201810717984 A CN201810717984 A CN 201810717984A CN 108612189 B CN108612189 B CN 108612189B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
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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
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1993—Details of framework supporting structure, e.g. posts or walls
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- Architecture (AREA)
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Abstract
The invention discloses a prefabricated UHPC shell locally-reinforced assembled concrete frame structure, which comprises a column base annular prefabricated UHPC shell, a prefabricated concrete column, a beam end U-shaped UHPC shell and a prefabricated concrete superposed beam, wherein the column base annular prefabricated UHPC shell is arranged on the column base annular prefabricated UHPC shell; the prefabricated concrete column is provided with an annular prefabricated UHPC shell at a column foot part; the column base annular prefabricated UHPC shell, the stirrups and the grouting sleeve are prefabricated into a whole; the beam end of the precast concrete superposed beam forms a U-shaped key slot through a U-shaped precast UHPC shell; the U-shaped UHPC shell at the beam end and the stirrup are prefabricated into a whole, and the lower part of the precast concrete superposed beam adopts small-specification high-strength steel bars; and after the superposed beam is in place, binding longitudinal ribs on the upper part of the beam, and then casting the superposed layer concrete on site to form an integral structure. The prefabricated UHPC shell with excellent performance is used at the maximum stress position of the assembled frame member, the advantages of the prefabricated UHPC shell and the assembled frame member are combined, the manufacturing cost is reduced, the assembled concrete frame structure form is innovated, and the earthquake resistance of the assembled frame structure is improved.
Description
Technical Field
The invention relates to a prefabricated UHPC shell local reinforced assembled concrete frame structure, and belongs to the field of building engineering.
Background
Under the new development situation, the country actively promotes the transformation and upgrading of the construction industry, and the assembled building is rapidly developed with good economic, environmental and social benefits. The prefabricated concrete frame structure can greatly improve the building capacity and the building speed, and is one of the most common and widely applied assembly type structural systems. At present, the assembled concrete frame mainly applied in China is provided with structural systems such as precast beam bottom rib anchoring type, beam end key slot lap joint type, node integral precast type and the like, and the problems of high precision processing requirement, insufficient applicability, inconvenient construction and construction or unsatisfactory earthquake resistance and the like of the systems often exist, so that the application advantages of the assembled concrete frame are greatly offset.
With the progress of building material technology, ultra-high performance concrete (UHPC for short) has been greatly developed, and has excellent properties of Ultra-high strength, high toughness, high impermeability, high corrosion resistance and the like, and is expected to become a basic material for the construction of next-generation infrastructure. However, due to the adoption of ultra-low water-gel ratio and high dosage of the cementing material, thermal curing is often required to effectively reduce drying and creep shrinkage, and the development of the material strength is ensured. And UHPC has high viscosity, is not easy to pump, and has relatively less cast-in-place operation. Due to the extremely high initial cost of UHPC, less is used in building structures.
The technical core and key difficulty of the assembled concrete frame structure are that the beam column and column base are connected, and the main aim of connection design is to realize quick and simple installation on the basis of ensuring the necessary mechanical properties. However, the beam column and column foot connecting part of the assembled concrete frame structure mainly used at present has the problem of easy centralized damage, influences the structural performance and is not beneficial to popularization and application of the assembled concrete frame.
Disclosure of Invention
In order to solve the problems, the invention provides a prefabricated UHPC shell local reinforced assembled concrete frame structure, which is an innovative assembled concrete frame structure form, wherein the prefabricated UHPC shell is used at the maximum stress position of an assembled frame member, and the advantages of an ultra-high performance material and a prefabrication technology are combined, so that the material performance is exerted, the influence of the manufacturing cost is reduced, and the construction convenience is improved. The problems that the existing assembly type frame structure is insufficient in adaptability, the UHPC material is difficult to construct and the cost is too high are solved. The invention solves the problem that the joint of the beam column and the column foot of the assembled concrete frame structure is easy to be damaged by centralized damage by combining the advantages of the beam column and the column foot.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a prefabricated UHPC shell local reinforcement assembled concrete frame structure which is characterized in that: the concrete composite beam comprises a precast concrete composite column, a precast concrete composite beam and cast-in-place concrete.
The precast concrete combined column comprises a column foot annular precast UHPC shell and a precast common concrete column; the column base annular prefabricated UHPC shell comprises a square shell, composite stirrups and a grouting sleeve.
The square shell is made of ultra-high performance concrete (UHPC) and is in a direction ring shape, and the height is obtained through rational calculation; the annular limb part of the composite stirrup is pre-buried in the square shell; the grouting sleeve is embedded on the square shell, and a half section part is embedded in the square shell, so that the bonding capacity of the follow-up common concrete on the UHPC square shell is enhanced.
The column base annular prefabricated UHPC shell is manufactured by adopting a detachable assembled template; the detachable assembled template comprises a detachable outer template and an inner template, wherein the detachable outer template consists of four flat templates and is annular; the inner template comprises four straight plates and four corner plates, an arc section is arranged on each straight plate, each corner plate is provided with an arc section at the corner, stirrup holes are formed in the joint positions of the straight plates and the corner plates, each stirrup hole comprises two semicircles, and the stirrup holes are respectively positioned on the straight plates and the corner plates. The detachable assembled template can effectively fix the positions of the grouting sleeve and the composite stirrup, is flexible to assemble and disassemble, greatly reduces the manufacturing difficulty, and can also ensure the manufacturing quality of prefabricated members.
The prefabricated common concrete column comprises longitudinal steel bars, stirrups and common concrete; the longitudinal steel bars are inserted into the grouting sleeve, and the stirrups are bound on the longitudinal steel bars to form a steel bar cage; the common concrete wraps the reinforcement cage and is filled in the hollow part of the column foot annular prefabricated UHPC shell, the column foot annular prefabricated UHPC shell with high strength and high toughness effectively enhances the mechanical property of the position with the largest stress of the column foot section range, and meanwhile, the common concrete of the column foot is restrained, the deformation capacity of column foot connection is improved, the bearing capacity reduction is slowed down, and the structural ductility is increased.
The precast concrete combined beam comprises a beam end U-shaped precast UHPC shell and a precast ordinary concrete beam; the beam end U-shaped prefabricated UHPC shell is arranged at the end part of the prefabricated common concrete beam to form a U-shaped key groove.
The beam end U-shaped prefabricated UHPC shell comprises a U-shaped shell and rectangular stirrups; the U-shaped shell is made of ultra-high performance concrete (UHPC) and consists of three surfaces; most of two long limbs and one short limb of the rectangular stirrup are pre-buried in the U-shaped shell.
The prefabricated common concrete beam is in a superposed beam form, and longitudinal steel bars at the lower part are small-specification 600 MPa-level high-strength steel bars; the lower longitudinal steel bars extend out of the U-shaped key grooves, and the end parts of the lower longitudinal steel bars are bent. Overlapping cast-in-place concrete on the upper surface of the precast common concrete beam within the height range of the floor slab; the U-shaped prefabricated UHPC shell enhances the beam end key groove area, and effectively reduces concentrated damage of the bottom of the conventional key groove caused by unstressed longitudinal ribs under the action of repeated load.
The prefabricated composite column is connected up and down through the sleeve, the prefabricated concrete composite beam is located in the two sides of the prefabricated composite column, the lower longitudinal steel bars extend into the node core area, cast-in-place concrete is poured in the node core area and the upper overlapping area of the prefabricated concrete composite beam, and an integral frame is formed after curing and hardening.
Preferably, the column base annular prefabricated UHPC shell is higher than the grouting sleeve by a small distance, so that the sectional rigidity and the strength are gradually changed stepwise within the range of the column base connecting height, and the problem that the performance of a component is influenced due to the local damage of common concrete at the position of the section change is avoided.
Preferably, the length of the beam end prefabricated U-shaped UHPC shell is slightly larger than that of the key groove, the joint surface of the beam end prefabricated U-shaped UHPC shell and prefabricated common concrete is increased, the bearing capacity and the deformation capacity of the beam end in a bending and shearing state are enhanced, and the anti-seismic performance is improved.
Preferably, the diameter of the small-specification high-strength steel bar at the lower part of the beam is 12-16 mm, and the diameter is determined by reasonable calculation; the small-specification high-strength steel bar has certain flexibility and can be broken by manpower, so that the problem of steel bar collision at the joint is effectively avoided.
The manufacturing and building method of the prefabricated UHPC shell local reinforced assembly type concrete frame structure is characterized by comprising the following steps of:
(1) Manufacturing an annular UHPC shell by adopting an assembled template in a factory, enabling column foot stirrups to pass through a preformed stirrup hole of the assembled template which is detachable, prefabricating the annular UHPC shell and a grouting sleeve together to form a whole, inserting longitudinal steel bars of the column into the grouting sleeve, binding a steel bar cage, pouring and curing ordinary concrete to form a prefabricated column;
(2) Prefabricating a U-shaped UHPC shell in a factory, prefabricating beam end stirrups and the UHPC shell into a whole, binding reinforcement cages, pouring and curing common concrete by adopting small-specification 600 MPa-level high-strength reinforcement bars at the lower part of the beam, and forming a prefabricated beam;
(3) Transporting the precast beam column to field installation: after the column longitudinal steel bars are in place in the grouting sleeve, high-strength grouting material is injected to complete connection of the prefabricated columns; and after the precast beam is in place, binding the common strength longitudinal ribs on the upper part of the beam, and casting the concrete of the laminated layer on site until the upper surface is within the height range of the floor slab, so that wet connection of beam column nodes is completed, and a reliable whole is formed.
(1) The invention uses the small-sized prefabricated UHPC shell to form a local composite structure at the maximum stress position of the assembled frame member, combines the advantages of the two to innovate the assembled concrete frame structure form, is convenient for prefabrication in factories, improves the stress performance of a connecting area, and simultaneously maximally reduces the cost, and promotes the popularization of the assembled structure and the transformation and upgrading of the building industry;
(2) The prefabricated UHPC shell is manufactured by adopting the assembled template, so that the manufacturing quality of the prefabricated part can be ensured, the assembled template is provided with corresponding spaces at the grouting sleeve and the stirrup, the positions of the assembled template are effectively fixed, the assembled template is flexibly assembled and disassembled, the manufacturing and construction difficulty of the UHPC shell is greatly reduced, and the efficiency is improved;
(3) According to the invention, 600 MPa-level small-specification high-strength steel bars are adopted as the beam bottom bars to be anchored into the node areas, and the small-specification high-strength steel bars can be manually broken, so that the steel bars in the node areas are effectively prevented from being collided, and the performance and construction convenience of the connecting areas are improved;
(4) According to the invention, the high-temperature pressurizing maintenance of the UHPC is realized in a factory through a prefabrication technology, so that the UHPC obtains better lumber property, and the problems of high viscosity, difficult pumping and high construction difficulty are solved; the influence of manufacturing cost is minimized, and the popularization and application of UHPC materials are facilitated.
Drawings
FIG. 1 is a schematic illustration of a toe-prefabricated annular UHPC shell of the present invention;
FIG. 2 is a schematic view of a removable modular form according to the present invention;
FIG. 3 is a schematic view of a removable inner form of the present invention;
FIG. 4 is a schematic view of a precast concrete column of the present invention;
FIG. 5 is a schematic view of a beam-end preformed U-shaped UHPC shell of the present invention;
FIG. 6 is a schematic view of a precast concrete beam of the present invention;
fig. 7 is a schematic diagram of the overall structure and node assembly of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1, a prefabricated annular UHPC shell of a column base is firstly manufactured, and the annular shell is surrounded by four UHPC surfaces 1; the annular UHPC shell, the grouting sleeve 2 and the column foot part stirrup 3 are prefabricated into a whole; the column foot annular prefabricated UHPC shell is higher than the grouting sleeve 2 by a small distance, so that the sectional rigidity and the strength can be gradually changed stepwise within the range of the column foot connecting height, and the influence on the performance of the component caused by the local damage of common concrete at the position of the section change is avoided.
The column base annular prefabricated UHPC shell shown in figure 1 is manufactured by adopting a detachable assembled template; the manufacturing process is as shown in fig. 2-3, the detachable assembled template comprises a detachable outer template 4 and an inner template 5, wherein the detachable outer template 4 consists of four flat templates and is annular; the inner template 5 comprises four straight plates 22 and four corner plates 21, an arc-shaped section 6 is arranged on each straight plate 22, each corner plate 21 is provided with an arc-shaped section 6 at the corner, stirrup holes 7 are formed in the joint position of each straight plate 22 and each corner plate 21, and the stirrup holes 7 are formed by two semicircles and are respectively positioned on the straight plates 22 and the corner plates 21. The grouting sleeve 2 is placed on the arc-shaped section 6, and the stirrup 3 at the column foot part passes through the stirrup hole 7; then UHPC material is poured into the template, high-temperature pressurizing maintenance is carried out, and the annular UHPC shell, the grouting sleeve 2 and the column foot part stirrup 3 are prefabricated into a whole.
As shown in fig. 4, the precast concrete column consists of a reinforcement cage, ordinary concrete 8 poured for the second time and a column base annular UHPC shell 9; firstly, inserting a longitudinal steel bar 10 into a grouting sleeve 2 in a column foot UHPC shell, binding stirrups 11, and then pouring and curing ordinary concrete 8 to form a prefabricated column; the longitudinal steel bars 10 of the precast concrete column extend out from the column top, the section of the column foot concrete is reduced, and the column foot concrete is matched with the column foot annular UHPC shell 9 to form a local composite structure; the column base annular UHPC shell 9 with high strength and high toughness effectively enhances the mechanical property of the position with the largest stress of the column base section range, simultaneously restrains column base common concrete, improves the deformation capability of column base connection, slows down the reduction of bearing capacity and increases the structural ductility.
As shown in fig. 5, the beam-end U-shaped UHPC shell is composed of three UHPC faces 12, forming a beam-end keyway 13; the length of the U-shaped UHPC shell is calculated reasonably; the beam-end U-shaped UHPC shell and the beam-end stirrup 14 are prefabricated into a whole; the length of the prefabricated U-shaped UHPC shell is slightly larger than that of the key groove 13, the joint surface with the prefabricated common concrete is increased, the bearing capacity and the deformation capacity of the beam end in a bending and shearing state are enhanced, and the anti-seismic performance is improved.
As shown in fig. 6, the precast concrete beam is a superposed beam, and is composed of a reinforcement cage, ordinary concrete 15 poured for the second time and a U-shaped UHPC shell 16; the steel bars of the superposed beam are stirrups 17 and small-specification high-strength steel bars 18 at the lower part of the beam; binding a reinforcement cage, pouring and curing ordinary concrete to form a precast beam; the concrete section of the beam end is reduced and matched with the U-shaped key groove 13, and a local composite structure is formed at the beam end; overlapping cast-in-place concrete on the upper surface of the precast concrete beam within the height range of the floor slab; the U-shaped UHPC shell 16 enhances the beam end key groove area, and effectively reduces concentrated damage to the bottom of a conventional key groove caused by unstressed longitudinal ribs under the action of repeated load.
The diameter of the small-specification high-strength steel bar 18 at the lower part of the beam is 12-16 mm, and the diameter is determined by reasonable calculation; the small-sized high-strength steel bars 18 have certain flexibility and can be manually broken, so that the problem of steel bar collision at the joints is effectively avoided.
In summary, the method for manufacturing the prefabricated part of the partially reinforced assembled concrete frame structure of the prefabricated UHPC shell comprises the following steps: (1) Prefabricating an annular UHPC shell 9 in a factory, prefabricating column foot stirrups 3, a grouting sleeve 2 and the UHPC shell into a whole, inserting column longitudinal steel bars 10 into the grouting sleeve 2, binding a steel reinforcement cage, pouring and curing common concrete to form a prefabricated column; (2) The U-shaped UHPC shell 16 is prefabricated in a factory, beam end stirrups and the UHPC shell are prefabricated into a whole, the stressed steel bars at the lower part of the beam adopt small-specification 600 MPa-level high-strength steel bars 18, reinforcement cages are bound, and ordinary concrete is poured and maintained to form the prefabricated beam.
As shown in fig. 7, after the column longitudinal steel bar 10 is in place in the grouting sleeve 2, high-strength grouting material is injected to enable the precast columns to be connected, the precast superposed beam is hoisted on two sides of the Yu Yuzhi column, the small-specification high-strength steel bar 18 at the lower part of the beam stretches into a node core area, the common longitudinal steel bar 19 at the upper part of the beam is bound, then post-cast concrete 20 is poured, after hardening, the upper precast column is hoisted to be located on the post-cast concrete 20, the longitudinal steel bar 10 of the lower precast column is inserted into the grouting sleeve 2 of the upper precast column, then high-strength grouting material is injected into the grouting sleeve, and after hardening, wet connection of the beam-column nodes is completed, so that a reliable whole is formed.
It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (3)
1. A prefabricated UHPC shell local reinforcement assembled concrete frame structure which is characterized in that: the concrete composite beam comprises a precast concrete composite column, a precast concrete composite beam and cast-in-place concrete;
the precast concrete combined column comprises a column foot annular precast UHPC shell and a precast common concrete column; the column base annular prefabricated UHPC shell comprises a square shell, composite stirrups and a grouting sleeve; the square shell is made of ultra-high performance concrete and is square ring-shaped; the annular limb part of the composite stirrup is pre-buried in the square shell; the grouting sleeve is embedded on the square shell, and a half section part is embedded in the square shell; the column base annular prefabricated UHPC shell is 3-10cm higher than the grouting sleeve;
the prefabricated common concrete column comprises longitudinal steel bars, stirrups and common concrete; the longitudinal steel bars are inserted into the grouting sleeve, and the stirrups are bound on the longitudinal steel bars to form a steel bar cage; the common concrete wraps the reinforcement cage and is filled in the hollow part of the column base annular prefabricated UHPC shell;
the precast concrete combined beam comprises a beam end U-shaped precast UHPC shell and a precast ordinary concrete beam; the beam end U-shaped prefabricated UHPC shell is arranged at the end part of the prefabricated common concrete beam to form a U-shaped key slot;
the beam end U-shaped prefabricated UHPC shell comprises a U-shaped shell and rectangular stirrups; the U-shaped shell is made of ultra-high performance concrete and consists of three surfaces; most of two long limbs and one short limb of the rectangular stirrup are pre-buried in the U-shaped shell;
the prefabricated common concrete beam is in a superposed beam form, and longitudinal steel bars at the lower part are small-specification 600 MPa-level high-strength steel bars; the diameter of the small-specification 600 MPa-level high-strength steel bar is 12, 14 or 16mm, the lower longitudinal steel bar extends out of the U-shaped key slot, and the end part is bent;
the upper part and the lower part of the precast concrete combined column are connected through grouting sleeves, the precast concrete combined beam is positioned at two sides of the precast concrete combined column, the lower longitudinal steel bars extend into the node core area, cast-in-place concrete is poured in the node core area and the upper overlapping area of the precast concrete combined beam, and an integral frame is formed after curing and hardening;
the manufacturing method of the column base annular prefabricated UHPC shell comprises the following steps: the method comprises the steps of manufacturing a detachable assembled template; the detachable assembled template comprises a detachable outer template and an inner template, wherein the detachable outer template consists of four flat templates and is annular; the inner template comprises four straight plates and four corner plates, an arc section is arranged on each straight plate, each corner plate is provided with an arc section at the corner, stirrup holes are formed in the joint positions of the straight plates and the corner plates, each stirrup hole comprises two semicircles, and the stirrup holes are respectively positioned on the straight plates and the corner plates.
2. A prefabricated UHPC shell partially-reinforced fabricated concrete frame structure according to claim 1, wherein: the beam-end U-shaped prefabricated UHPC shell length is greater than the U-shaped keyway length.
3. The method of making and constructing a prefabricated UHPC shell partially-reinforced fabricated concrete frame structure according to claim 1, comprising the steps of:
(1) Manufacturing an annular UHPC shell by adopting an assembled template in a factory, enabling column foot stirrups to pass through a preformed stirrup hole of the assembled template which is detachable, prefabricating the annular UHPC shell and a grouting sleeve together to form a whole, inserting longitudinal steel bars of the column into the grouting sleeve, binding a steel bar cage, pouring and curing ordinary concrete to form a prefabricated column;
(2) Prefabricating a U-shaped UHPC shell in a factory, prefabricating beam end stirrups and the UHPC shell into a whole, binding reinforcement cages, pouring and curing common concrete by adopting small-specification 600 MPa-level high-strength reinforcement bars at the lower part of the beam, and forming a prefabricated beam;
(3) Transporting the precast beam column to field installation: after the column longitudinal steel bars are in place in the grouting sleeve, high-strength grouting material is injected to complete connection of the prefabricated columns; and after the precast beam is in place, binding the common strength longitudinal ribs on the upper part of the beam, and casting the concrete of the laminated layer on site until the upper surface is within the height range of the floor slab, so that wet connection of beam column nodes is completed, and a reliable whole is formed.
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