CN111287374B - Local UHPC reinforced high-efficiency assembled concrete laminated slab - Google Patents
Local UHPC reinforced high-efficiency assembled concrete laminated slab Download PDFInfo
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- CN111287374B CN111287374B CN202010213372.8A CN202010213372A CN111287374B CN 111287374 B CN111287374 B CN 111287374B CN 202010213372 A CN202010213372 A CN 202010213372A CN 111287374 B CN111287374 B CN 111287374B
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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
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a local UHPC reinforced high-efficiency fabricated concrete composite slab, wherein cross bottom ribs and embedded bolt columns are arranged in a prefabricated UHPC reinforced block, and a groove is reserved on the bottom surface; the edge of the precast concrete bottom plate is distributed with the precast UHPC reinforcing blocks, one side of the angle steel connecting piece is arranged in a groove on the bottom surface of the UHPC reinforcing block, and a lead block is embedded at a corner; after the precast concrete bottom plate is installed in the building structure, the other side of the angle steel connecting piece is connected with the building structure through a bolt; and laying common upper reinforcing steel bars, and pouring the cast-in-place concrete on the precast concrete bottom plate. The invention uses the prefabricated UHPC shell with superior performance at the lower part connecting part of the prefabricated concrete composite slab, improves the stress performance, combines the advantages of the prefabricated concrete composite slab and the prefabricated concrete composite slab, reduces the manufacturing cost, connects the bottom plate of the prefabricated composite slab and the building structure through the special angle steel connector, solves the problem that the bottom rib of the prefabricated composite slab stretches out to influence the installation efficiency, and enhances the connection strength and the energy consumption capability.
Description
Technical Field
The invention belongs to the field of constructional engineering, and particularly relates to a local UHPC (ultra high performance concrete) reinforced efficient fabricated concrete composite slab.
Background
Under the new development situation, the nation actively promotes the transformation and upgrade of the construction industry, and the assembly type building is rapidly developed with good economic, environmental and social benefits. At present, in engineering practice, the most extensive prefabricated components are prefabricated laminated slabs. In the main design specifications of the prefabricated concrete structure in China, the bottom ribs in at least one direction of the prefabricated composite slab are required to extend into the laminated layers of the peripheral components, so that the connection performance and the integrity of the prefabricated composite slab and the structure are improved. However, a large number of steel bars are usually reserved on the peripheral components of the prefabricated composite slab, and bottom bars extending out of the side edges of the prefabricated composite slab interfere with the peripheral components in the installation and positioning process of the prefabricated composite slab, so that the installation difficulty of the prefabricated composite slab is greatly improved, the construction efficiency is reduced, even the prefabricated components are damaged, and the application advantages of the prefabricated composite slab are greatly offset. In fact, from the aspect of stress, the bottom rib part of the precast slab, which extends into the peripheral component from the bottom of the precast slab, is stressed less under normal conditions, and only plays a role in preventing the floor from falling under the action of earthquake load, so that the utilization efficiency is low.
With the progress of building material technology, Ultra-High Performance Concrete (UHPC) has been developed greatly, and has excellent properties such as Ultra-High strength, High toughness, High impermeability and High corrosion resistance, and is expected to become a basic material for the construction of next-generation infrastructure. However, due to the ultra-low water-to-gel ratio and the higher amount of gelled material, hot curing is often required to effectively reduce drying and creep shrinkage, and ensure the development of material strength. And UHPC viscosity is high, is difficult for the pump sending, and cast-in-place operation is relatively less. Because of the extremely high initial cost of UHPC, it is used less in building construction.
Due to the characteristics of the UHPC and the advantages of the fabricated concrete building structure, the combination of the UHPC and the fabricated concrete building structure can exert the advantages of the UHPC and the fabricated concrete building structure to the maximum extent, and avoid the related disadvantages. The demand that the prefabricated concrete laminated bottom plate reduces the extending ribs and improves the construction efficiency can be effectively solved in a UHPC local reinforcing mode, and the invention is provided for the demand.
Disclosure of Invention
In order to solve the problems, the invention discloses a local UHPC (ultra high performance concrete) enhanced efficient fabricated concrete composite slab, wherein a prefabricated UHPC block is used at the joint of the lower part of the prefabricated concrete composite slab, and the connection between a bottom plate of the prefabricated composite slab and a building structure is carried out through an angle steel connector, so that the problem that the bottom rib of the prefabricated composite slab stretches out to influence the installation efficiency is solved, and the connection strength and the energy consumption capability after the installation are simultaneously finished; the advantages of the ultrahigh-performance material and the prefabrication technology are combined, the material performance is exerted, and the influence of the manufacturing cost is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a local UHPC reinforced efficient fabricated concrete laminated slab comprises a prefabricated UHPC reinforcing block, a prefabricated concrete bottom plate, an angle steel connecting piece, an upper common steel bar and cast-in-place concrete.
The prefabricated UHPC reinforcing block comprises a crossed bottom rib, a pre-buried bolt column and a prefabricated UHPC block. The prefabricated UHPC block wraps the crossed bottom ribs and the embedded bolt hole parts, and a square groove is reserved on the bottom surface; the crossed bottom ribs form a grid in a shape like a Chinese character 'jing', extend out of the left side edge, the right side edge and the front side edge of the prefabricated UHPC block, and the extension length is greater than the lap joint length of the steel bars; the embedded bolt columns are perpendicular to the crossed bottom ribs, embedded bolt holes are formed in the lower ends of the embedded bolt columns, and eyelet ends are located in grooves in the bottom surfaces of the prefabricated UHPC reinforcing blocks. The prefabricated UHPC reinforcing block is used for reinforcing the joint of the prefabricated concrete bottom plate, so that the joint is not easy to damage under a large load.
The edges of the precast concrete bottom plate are uniformly distributed with the precast UHPC reinforcing blocks, and other parts are precast common concrete and are embedded with common reinforcing steel bar meshes; the common reinforcing mesh does not extend out of the precast concrete, and the problem that the extending ribs of the conventional precast laminated slab interfere with peripheral members does not exist during subsequent hoisting.
Long slotted holes parallel to the length direction are reserved on one side of the angle steel connecting piece, and long slotted holes in the vertical direction are reserved on the other side of the angle steel connecting piece; the angle steel connecting piece passes through the long slotted hole in the vertical direction through a bolt and is arranged in a pre-buried bolt hole in the groove on the bottom surface of the UHPC reinforcing block; the angle steel connecting piece is embedded with a lead block at the inner side of the corner, and is used for improving the energy consumption capacity under the action of earthquake loads.
After the precast concrete bottom plate is installed in a building structure, the lower installed angle steel connecting piece is connected with a bolt hole pre-embedded in the building structure through a bolt penetrating through a long slotted hole in the direction parallel to the length direction, when an error exists in installation, the bolt on the other side can be loosened for adjustment, and after the adjustment is completed, all the bolts can be screwed to complete the installation.
And the upper common steel bars extend into the superposed layers of the peripheral members of the precast concrete bottom plate, the cast-in-place concrete is poured on the precast concrete bottom plate, and a complete floor slab is formed after curing and hardening.
Preferably, the thickness of the prefabricated UHPC reinforcing blocks is consistent with that of the prefabricated concrete bottom plate.
Preferably, the prefabricated UHPC reinforcing block can be provided with vertical anchoring ribs; and hooks are arranged at two ends of the vertical anchoring rib, one end of the vertical anchoring rib is bound with the crossed bottom rib, and the other end of the vertical anchoring rib is perpendicular to the crossed bottom rib and extends upwards out of the prefabricated UHPC block, so that the combination capacity of the prefabricated UHPC and common concrete is further improved.
Preferably, the surface of the angle steel connecting piece is plated with an anticorrosive coating, so that the durability is improved; according to the construction scheme on site, the precast concrete bottom plate can be installed after being hung in a building structure.
Preferably, the depth of the groove in the bottom surface of the prefabricated UHPC block is slightly larger than the sum of the thickness of the steel plate on one side of the angle steel connecting piece and the thickness of the end head of the bolt, so that a space is reserved for plugging subsequent common mortar.
Preferably, after the cast-in-place concrete is poured, the grooves in the bottom surface of the prefabricated UHPC block can be plugged by adopting common mortar, so that the angle steel connecting piece is further protected, and the attractiveness is improved.
A manufacturing and building method of a local UHPC reinforced high-efficiency fabricated concrete composite slab comprises the following steps:
(1) firstly manufacturing the prefabricated UHPC reinforcing block in a factory, and adopting high-temperature pressurized curing at 100 +/-5 ℃ and 2MPa to improve the manufacturing quality of the UHPC;
(2) arranging a side formwork on a conventional prefabricated laminated slab formwork according to the specification and the size of the prefabricated concrete bottom plate, fixing the UHPC reinforcing blocks close to the side formwork at a certain interval, then binding a common reinforcing mesh, performing lap-joint binding on the common reinforcing mesh and crossed bottom ribs of the UHPC reinforcing blocks, and performing maintenance after pouring common concrete;
(3) after the precast concrete bottom plate is hardened, the angle steel connecting piece is installed; after the precast concrete bottom plate is lifted to a preset position, a bolt penetrates through the long slotted hole of the angle steel connecting piece and is screwed into a bolt hole pre-embedded in a building structure for fixing; when the angle steel connecting piece cannot be tightly attached to peripheral components, the bolts on the precast concrete bottom plate can be loosened, the position of the angle steel connecting piece is adjusted forwards and backwards, and after the angle steel connecting piece reaches a proper position, all the bolts are screwed down;
(4) binding upper common steel bars, extending into the superposed layers of the peripheral members of the precast concrete bottom plate, and pouring common concrete to form a reliable whole.
(5) The installation part of the angle steel connecting piece is plugged by adopting common mortar.
The invention has the beneficial effects that:
(1) the invention cancels the side edge extending rib of the conventional precast concrete superposed bottom plate, avoids the interference of the extending rib in the installation process, improves the construction efficiency, reduces the labor cost and is beneficial to the popularization and the application of the fabricated concrete structure.
(2) The angle steel connecting piece provided with the mutually vertical long slotted holes is adopted, so that the mounting is flexible, the error is adjustable, the precision requirements of manufacturing and mounting of the prefabricated laminated slab are reduced, the production cost is further reduced, and the construction efficiency is improved; and the angle steel connecting piece is embedded with a lead block, so that the shock resistance and energy consumption capacity are improved.
(3) The invention realizes the high-temperature pressurized maintenance of the UHPC in a factory through the prefabrication technology, so that the UHPC obtains better material property, and simultaneously solves the problems of high viscosity, difficult pumping and large construction difficulty. The manufacturing cost is reduced, and the popularization and the application of the UHPC material are facilitated.
Drawings
FIG. 1 is a three-dimensional schematic diagram of a prefabricated UHPC reinforcing block of the present invention;
FIG. 2 is a schematic three-dimensional perspective view of a prefabricated UHPC reinforcing block of the present invention;
FIG. 3 is a three-dimensional schematic view of a precast concrete floor of the present invention;
FIG. 4 is a schematic three-dimensional perspective view of a precast concrete floor of the present invention;
FIG. 5 is a three-dimensional schematic view of the angle iron connector of the present invention;
FIG. 6 is a schematic view of the bolt installation of the present invention;
FIG. 7 is a schematic three-dimensional view of the invention after molding;
FIG. 8 is a schematic diagram of a three-dimensional perspective after molding in accordance with the present invention.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-2, firstly manufacturing the prefabricated UHPC reinforcing block in a factory, wherein the prefabricated UHPC reinforcing block is composed of cross bottom ribs 1, embedded bolt columns 2 and prefabricated UHPC blocks 3; vertical anchoring ribs 4 can also be additionally arranged, hooks are arranged at two ends of each vertical anchoring rib 4, and one end of each vertical anchoring rib is bound with the crossed bottom rib. The prefabricated UHPC block 3 partially wraps the crossed bottom ribs 1 and the embedded bolt holes 2, and square grooves 5 are reserved on the bottom surface. The crossed bottom ribs 1 form a grid in a shape of a Chinese character jing, extend out of the left side edge, the right side edge and the front side edge of the prefabricated UHPC block 3, and the extension length is greater than the lap joint length of the steel bars; on the embedded bolt post 2 vertical cross base muscle 1, the embedded bolt post 2 lower extreme is equipped with the embedded bolt hole, and the eyelet end is located prefabricated UHPC reinforcing block bottom surface recess 5.
As shown in fig. 3-4, according to the specification and size of the prefabricated concrete bottom plate, arranging a side formwork on a conventional prefabricated laminated slab bench formwork, fixing the prefabricated UHPC reinforcing blocks 6 close to the side formwork at a certain interval, then binding a common reinforcing mesh 7, wherein the common reinforcing mesh 7 does not extend out of the side formwork, overlapping and binding the common reinforcing mesh 7 and the extending parts of the crossed bottom ribs 1 of the prefabricated UHPC reinforcing blocks 6, and curing after pouring common concrete 8; after the precast concrete bottom plate is hardened, the angle steel connecting piece 9 is installed.
As shown in FIG. 5, a long slot 10 parallel to the length direction is reserved on one side of the angle steel connecting piece, a long slot 11 perpendicular to the length direction is reserved on the other side of the angle steel connecting piece, and a lead block 12 is embedded on the inner side of a folding angle.
As shown in fig. 6, after the precast concrete floor 13 is lifted to a predetermined position, bolts 14 pass through the long slotted holes 10 of the angle steel connecting pieces 9 and are screwed into bolt holes pre-embedded in the building structure 15 for fixing; when the angle steel connecting piece 9 can not be tightly attached to peripheral components, the bolts 16 on the precast concrete bottom plate can be loosened, the position of the angle steel connecting piece 9 is adjusted forwards and backwards, and after the angle steel connecting piece reaches a proper position, all the bolts are screwed down;
as shown in fig. 7-8, the upper common steel bars 17 are bound and extended into the overlapped layer of the prefabricated concrete bottom plate peripheral component 18, and the on-site common concrete 19 is poured to form a reliable whole. The installation part of the angle steel connecting piece is plugged by adopting common mortar.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (7)
1. The utility model provides a local UHPC reinforced high-efficient assembled concrete superimposed sheet which characterized in that: the steel plate comprises a prefabricated UHPC reinforcing block, a prefabricated concrete bottom plate, an angle steel connecting piece, an upper common steel bar and cast-in-place concrete;
the prefabricated UHPC reinforcing block comprises a cross bottom rib, an embedded bolt column and a prefabricated UHPC block, the cross bottom rib and the embedded bolt column are partially wrapped by the prefabricated UHPC block, and a square groove is reserved on the bottom surface; the crossed bottom ribs form a grid in a shape like a Chinese character 'jing', extend out of the left side edge, the right side edge and the front side edge of the prefabricated UHPC block, and the extension length is greater than the lap joint length of the steel bars; the embedded bolt columns are perpendicular to the cross bottom ribs, embedded bolt holes are formed in the lower ends of the embedded bolt columns, and eyelet ends are located in grooves in the bottom surfaces of the prefabricated UHPC reinforcing blocks;
the edges of the precast concrete bottom plate are uniformly distributed with the precast UHPC reinforcing blocks, and other parts are precast common concrete and are embedded with common reinforcing steel bar meshes; the common reinforcing mesh does not extend out of the precast concrete;
long slotted holes parallel to the length direction are reserved on one side of the angle steel connecting piece, and long slotted holes in the vertical direction are reserved on the other side of the angle steel connecting piece; the angle steel connecting piece passes through the vertical elongated slotted hole through a bolt and is arranged in a pre-buried bolt hole in a groove on the bottom surface of the prefabricated UHPC reinforcing block; the angle steel connecting piece is internally provided with a lead block at the inner side of a folding angle;
after the precast concrete bottom plate is installed in a building structure, the lower installed angle steel connecting piece is connected with a bolt hole pre-embedded in the building structure through a bolt penetrating through a long slotted hole in the direction parallel to the length direction;
and the upper common steel bars extend into the superposed layers of the peripheral components of the precast concrete bottom plate, and the cast-in-place concrete is poured on the precast concrete bottom plate.
2. The high efficiency fabricated concrete composite slab with localized UHPC reinforcement as recited in claim 1, wherein: the thickness of the prefabricated UHPC reinforced block is consistent with that of the prefabricated concrete bottom plate.
3. The high efficiency fabricated concrete composite slab with localized UHPC reinforcement as recited in claim 1, wherein: prefabricating a UHPC reinforcing block and arranging vertical anchoring ribs; and hooks are arranged at two ends of the vertical anchoring rib, one end of the vertical anchoring rib is bound with the crossed bottom rib, and the other end of the vertical anchoring rib is perpendicular to the crossed bottom rib and extends upwards out of the prefabricated UHPC block.
4. The high efficiency fabricated concrete composite slab with localized UHPC reinforcement as recited in claim 1, wherein: the surface of the angle steel connecting piece is plated with an anticorrosive layer; and after the precast concrete bottom plate is hung in a building structure, the precast concrete bottom plate is installed.
5. The high efficiency fabricated concrete composite slab with localized UHPC reinforcement as recited in claim 1, wherein: the depth of the groove on the bottom surface of the prefabricated UHPC block is larger than the sum of the thickness of a steel plate on one side of the angle steel connecting piece and the thickness of the end head of the bolt.
6. The high efficiency fabricated concrete composite slab with localized UHPC reinforcement as recited in claim 1, wherein: and after the cast-in-place concrete is poured, the grooves on the bottom surface of the prefabricated UHPC block are blocked by adopting common mortar.
7. The method for manufacturing and constructing the partially UHPC-reinforced high-efficiency fabricated concrete composite slab as claimed in claim 1, which comprises the following steps:
(1) first manufacturing the prefabricated UHPC reinforced block in a factory; high-temperature pressurized curing is carried out, the temperature is 100 +/-5 ℃, and the pressure is 2 MPa;
(2) arranging a side formwork on a conventional prefabricated laminated slab formwork according to the specification and the size of the prefabricated concrete bottom plate, fixing the prefabricated UHPC reinforcing blocks close to the side formwork at a certain interval, then binding a common reinforcing mesh, performing lap-joint binding on the common reinforcing mesh and crossed bottom ribs of the prefabricated UHPC reinforcing blocks, and performing maintenance after pouring common concrete;
(3) after the precast concrete bottom plate is hardened, the angle steel connecting piece is installed; after the precast concrete bottom plate is lifted to a preset position, a bolt penetrates through the long slotted hole of the angle steel connecting piece and is screwed into a bolt hole pre-embedded in a building structure for fixing; when the angle steel connecting piece cannot be tightly attached to peripheral components, loosening the bolts on the precast concrete bottom plate, adjusting the position of the angle steel connecting piece back and forth, and screwing all the bolts after the angle steel connecting piece reaches a proper position;
(4) binding upper common steel bars, extending into the superposed layers of the peripheral members of the precast concrete bottom plate, and pouring common concrete to form a reliable whole;
(5) the installation part of the angle steel connecting piece is plugged by adopting common mortar.
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| CN112012386B (en) * | 2020-09-04 | 2021-08-03 | 上海凯汇建筑设计有限公司 | Prefabricated bottom plate of laminated slab, laminated slab and preparation method of laminated slab |
| CN112282078B (en) * | 2020-11-27 | 2022-11-11 | 北京市市政工程研究院 | Concrete connecting piece and integrated surface layer connecting process thereof |
| CN113609566B (en) * | 2021-08-18 | 2024-01-26 | 上海中森建筑与工程设计顾问有限公司 | Design method of prefabricated laminated slab, assembly and disassembly method and prefabricated laminated slab |
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| DE4239057C2 (en) * | 1992-11-20 | 1997-02-13 | Eberhard Schrade | Process and prefabricated module for the production of structures and buildings |
| ITBO20030046A1 (en) * | 2003-02-03 | 2004-08-04 | Coperlegno Srl | PREFABRICATED ELEMENTS FOR THE REALIZATION OF FLOORS |
| CN205935352U (en) * | 2016-08-24 | 2017-02-08 | 仇国辉 | Building carrier plate is from formwork |
| CN107246107B (en) * | 2017-04-21 | 2018-05-29 | 清华大学 | Cancel the construction and construction method of beard muscle in a kind of concrete prefabricated board plate end |
| CN108360723B (en) * | 2018-03-03 | 2020-03-13 | 北京工业大学 | Assembly type large module semi-welded superposed beam plate structure with stereo truss temporary support |
| CN109736499B (en) * | 2018-12-27 | 2020-06-23 | 浙江大经住工科技有限公司 | Prefabricating process of prefabricated laminated slab |
| CN110195488A (en) * | 2019-06-06 | 2019-09-03 | 呼和浩特市中朵兴泰远大建筑工业有限公司 | A kind of concrete prefabricated board and its installation method |
| CN110625732A (en) * | 2019-07-03 | 2019-12-31 | 辽宁煜梽新型建材有限公司 | Method for manufacturing laminated plate |
| CN110258882A (en) * | 2019-07-09 | 2019-09-20 | 四川福美来新型建筑材料有限公司 | A kind of T-steel floor plates of integrated house |
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