CN114215249A - Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof - Google Patents
Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof Download PDFInfo
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- CN114215249A CN114215249A CN202210013361.4A CN202210013361A CN114215249A CN 114215249 A CN114215249 A CN 114215249A CN 202210013361 A CN202210013361 A CN 202210013361A CN 114215249 A CN114215249 A CN 114215249A
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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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- 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
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- 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
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- 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
- E04G21/121—Construction of stressing jacks
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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
- E04B2005/176—Floor structures partly formed in situ with peripheral anchors or supports
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- Reinforcement Elements For Buildings (AREA)
Abstract
A UHPC-NC laminated slab with shear groove keys and connected by separate seams mainly comprises prefabricated slabs and cast-in-place layers, wherein adjacent prefabricated slabs are connected by separate seams. The prefabricated panel includes: a plurality of longitudinal prestressed tendons, a plurality of equally-spaced transverse distributed steel bars, a plate end steel bar net piece, a transverse deep groove and a transverse shallow groove on the top of a prefabricated plate and common concrete; the cast-in-place layer includes: the end anchor transverse rib is arranged in the transverse deep groove, the separating type joint is arranged on the reinforcing rib in the transverse deep groove, the transverse distribution reinforcing steel bar is arranged in the transverse shallow groove, and the plurality of longitudinal stress reinforcing steel bars and the ultra-high performance concrete are arranged on the top of the prefabricated slab. The invention improves the stress performance of the structure, has reliable integrity, improves the construction efficiency and saves the construction cost.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a UHPC-NC laminated slab with shear groove keys and a separated seam connection method thereof.
Background
With the rapid development of society, the quality and requirements of buildings are improved, and the improvement of building structures is accompanied with the optimization of components and materials. The fabricated concrete structure is widely popularized and applied, and the floor slab is also changed into a form of factory prefabrication of a lower bottom plate and cast-in-place of an upper laminated layer. The laminated slabs adopted in the current building engineering mainly comprise flat plate type laminated slabs, steel bar truss laminated slabs and prefabricated ribbed prestressed concrete laminated slabs. The flat plate type laminated slab is low in rigidity and poor in longitudinal shear resistance; the steel quantity for the steel bar truss laminated slab is high; the prefabricated ribbed prestressed laminated slab has low production efficiency and poor integrity. In addition, the joint treatment method of the prior laminated plate mainly comprises an integral joint and a separated joint. When the integral joint is adopted, the steel bars in the prefabricated slab need to extend out of the slab side, the prefabricated slab is connected on site and then concrete is poured, the joint is complex in form and structure, the steel bars are complex to process in the component manufacturing process, steel bar avoidance needs to be considered, inconvenience is brought to each link of hoisting, transportation, finished product protection, installation and the like, the construction process is increased, and the site construction efficiency is reduced; when the traditional separated joint is adopted, the steel bars in the precast slabs do not need to extend outwards, but the additional steel bars are placed in the post-cast concrete area along the length direction of the joint, so that the structure is relatively simple, and the manufacturing, construction and installation are convenient.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a UHPC-NC laminated slab with a shear groove key and a construction method thereof, which fully embody the concept of an assembly structure, fully exert the characteristics, further improve the stress performance of the structure, enhance the capability of transferring transverse shear and bending moment, improve the construction efficiency and save the construction cost.
In order to achieve the purpose, the invention adopts the technical scheme that:
a UHPC-NC laminated slab with shear groove keys connected by separate seams comprises precast slabs and cast-in-place layers, wherein the adjacent precast slabs are connected by the separate seams in the longitudinal direction;
the prefabricated slab is a slab main body formed by pouring common concrete, and a plurality of transverse deep grooves and transverse shallow grooves are reserved on the slab top of the prefabricated slab;
the cast-in-place layer comprises end anchor transverse ribs, reinforcing ribs, transversely distributed reinforcing steel bars and cast-in-place ultrahigh-performance concrete, the end anchor transverse ribs are arranged in transverse deep grooves of adjacent prefabricated plates in a penetrating mode, the reinforcing ribs are arranged between the end portions of the transverse deep grooves of the adjacent prefabricated plates, and the transversely distributed reinforcing steel bars are arranged in transverse shallow grooves of the adjacent prefabricated plates in a penetrating mode, namely the end anchor transverse ribs, the reinforcing ribs and the transversely distributed reinforcing steel bars all span the separated seams.
In one embodiment of the invention, longitudinal prestressed tendons, transverse distributed steel bars and steel bar meshes are arranged in the precast slab; the longitudinal prestressed tendons are arranged at equal intervals, the transverse distributed steel bars are arranged on the longitudinal prestressed tendons at equal intervals, and the steel bar net pieces are arranged at two ends of the prefabricated slab and are perpendicular to the longitudinal prestressed tendons.
In one embodiment of the invention, the longitudinal tendons and transverse distribution tendons are encased by the plain concrete.
In one embodiment of the invention, the distance between the longitudinal prestressed tendon and the bottom of the precast slab is 15mm, two pieces of steel bar net sheets are arranged in the length range of 10d and not less than 100mm at the end part of the precast slab, wherein d is the nominal diameter of the longitudinal prestressed tendon, the width of the transverse deep groove is 30mm, and the depth is 45 mm; the width of the transverse shallow groove is 30mm, the depth of the transverse shallow groove is 30mm, and the thickness of the ultra-high performance concrete on the top of the precast slab is 25 mm.
In one embodiment of the invention, the deep lateral grooves alternate with shallow lateral grooves.
In an embodiment of the invention, the cast-in-place layer further comprises equally spaced longitudinal stressed steel bars arranged on the tops of the precast slabs, and the ultra-high performance concrete fills the transverse deep grooves and the transverse shallow grooves and covers the transverse distribution steel bars and the longitudinal stressed steel bars.
In one embodiment of the invention, the end anchor transverse bar and the transverse distribution reinforcing bar are straight bars, and the reinforcing bar is composed of a bottom straight bar, two upward inclined bars respectively connected to two ends of the bottom straight bar, and two top straight bars respectively connected to top ends of the two upward inclined bars.
In one embodiment of the invention, the bottom straight rib is positioned above the end anchor transverse rib, and the top straight rib extends into the cast-in-situ layer.
The invention also provides a construction method of the UHPC-NC laminated slab with the shear groove keys and the separated joint connection, which comprises the following steps:
step 1), erecting a prefabricated slab template in a factory, reserving a transverse deep groove and a transverse shallow groove in the template, and pouring by using common concrete;
and 2), hoisting the precast slabs in place on site, arranging end anchor transverse ribs and reinforcing ribs in the transverse deep grooves corresponding to the separated joints, arranging transverse distribution reinforcing steel bars in the transverse shallow grooves, pouring ultrahigh-performance concrete to fill the transverse deep grooves and the transverse shallow grooves and wrap the transverse distribution reinforcing steel bars, and continuously pouring the ultrahigh-performance concrete to finish the manufacturing.
More specifically, in the step 1), an end hole is reserved in the length direction of the template and is used for inserting a longitudinal prestressed tendon, a transversely distributed steel bar, a steel bar net piece and the longitudinal prestressed tendon are bound and fixed according to a preset position, one end of the longitudinal prestressed tendon is fixed on a fixed pedestal, the other end of the longitudinal prestressed tendon penetrates through a fixed cross beam, a jack and a movable cross beam, the movable cross beam is pushed by the jack, the longitudinal prestressed tendon is tensioned, pouring, vibrating and maintaining of common concrete are carried out after tensioning is finished, when the compressive strength of a concrete cube reaches 75% of a design value, the longitudinal prestressed tendon is loosened, when the compressive strength of the concrete cube reaches 100% of the design value, the template is removed, and the precast slab is manufactured;
and 2), arranging pipelines in part of the transverse deep grooves and part of the transverse shallow grooves, arranging transverse distribution reinforcing steel bars in the transverse shallow grooves and equidistant longitudinal stress reinforcing steel bars at the tops of the precast slabs, pouring ultrahigh-performance concrete to fill the transverse deep grooves and the transverse shallow grooves and coat the transverse distribution reinforcing steel bars and the longitudinal stress reinforcing steel bars.
Compared with the prior art, the invention has the beneficial effects that:
1) the prefabricated slab is used as an upper cast-in-place layer template, the workload of formwork support, formwork removal, temporary support and the like in the construction process is greatly reduced, the construction is simpler and more convenient, and the construction efficiency is improved.
2) The top surface of the precast slab is provided with the groove-shaped shear connector at equal intervals along the length direction, the overlapping area of two kinds of concrete is increased by the groove-shaped shear connector, the adhesive force between the precast slab and a cast-in-place layer is enhanced, and the longitudinal shear resistance of an overlapping surface is improved.
3) In order to facilitate the arrangement of pipelines, the width of the transverse shallow groove is designed to be 30mm and the depth is designed to be 30mm according to the common pipeline diameter of 20mm and 25 mm. The width of the transverse deep groove is designed to be 30mm, and the depth is designed to be 45 mm. The transverse shallow grooves and the transverse deep grooves are alternately arranged at equal intervals, so that weak surfaces are prevented from being concentrated on the same height of the section.
4) The end anchor transverse ribs and the reinforcing ribs are placed in the transverse deep grooves corresponding to the joints of the two separately spliced bottom plates, so that the capability of transferring transverse shearing force and bending moment is enhanced.
5) The cast-in-place layer is cast with 25mm thick ultrahigh performance concrete, the compressive strength is high, the durability is good, the bonding force is strong, and the wrapping performance of the reinforcing steel bar is better compared with that of common concrete with the same thickness.
6) Materials such as reinforcing steel bars and related equipment are saved, the requirements of manpower and material resources are reduced, and the construction cost is reduced. The factory production reduces the construction waste on the construction site, improves the environment and is green and environment-friendly.
In conclusion, the UHPC-NC laminated slab with the shear groove keys in the separated seam connection can improve the structural stress performance, improve the construction efficiency, save the cost, is green and environment-friendly, and can be widely applied to the field of engineering and construction.
Drawings
FIG. 1 is a schematic view of a split seam-joined UHPC-NC laminated veneer sheet with shear keys according to the present invention.
FIG. 2 is a longitudinal cross-sectional view of a split seam-joined UHPC-NC composite laminate with shear keys according to the present invention.
FIG. 3 is a schematic view of a split joint of UHPC-NC laminated panels with shear keys for a split joint connection of the present invention.
Fig. 4 is a schematic view of the structure of the reinforcing bar of the present invention.
FIG. 5 is an overall view of a split joint-joined UHPC-NC composite panel with shear keys according to the present invention after splicing.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention relates to a UHPC-NC laminated slab with shear groove keys in split joint connection, which is characterized in that a bottom plate with the shear groove keys is prefabricated in a factory, and cast-in-situ super-high-performance concrete is assembled and poured on a construction site
As shown in fig. 1 to 5, the present invention specifically includes prefabricated panels 1 and cast-in-place layers 2, and adjacent prefabricated panels 1 are connected by a separated joint 3 in a longitudinal direction, that is, a separated joint 3 is formed between adjacent prefabricated panels 1 in the longitudinal direction.
The main body of the precast slab 1 is formed by pouring common concrete 1-6, and a plurality of transverse deep grooves 1-3 and transverse shallow grooves 1-4 are reserved on the slab top. Obviously, the transverse deep grooves 1-3 can be arranged at equal intervals, the transverse shallow grooves 1-4 can be arranged at equal intervals, the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 can also be arranged at equal intervals, and the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 can be alternately arranged.
The cast-in-place layer 2 comprises end anchor transverse ribs 2-1, reinforcing ribs 2-2, transverse distribution reinforcing ribs 2-3 and cast-in-place ultrahigh-performance concrete 2-5, the end anchor transverse ribs 2-1 are arranged in the transverse deep grooves 1-3 of the adjacent prefabricated plates 1 in a penetrating mode, the reinforcing ribs 2-2 are only arranged between the end portions of the transverse deep grooves 1-3 of the adjacent prefabricated plates 1, and the transverse distribution reinforcing ribs 2-3 are arranged in the transverse shallow grooves 1-4 of the adjacent prefabricated plates 1 in a penetrating mode, namely the end anchor transverse ribs 2-1, the reinforcing ribs 2-2 and the transverse distribution reinforcing ribs 2-3 all span the separated seams 3, and meanwhile the end anchor transverse ribs 2-1 and the transverse distribution reinforcing ribs 2-3 penetrate all the prefabricated plates 1 in the same direction. Wherein, the end anchor transverse bar 2-1 can also be used as a part of transverse distribution reinforcing steel bars in a cast-in-situ layer to transfer shearing force and bending moment; the reinforcing ribs 2-2 are used for reinforcing connection, and two ends of the reinforcing ribs are bent into the cast-in-place layer 2; the transverse distribution steel bars 2-3 are connected with the adjacent prefabricated plates 1, so that partial shearing force and bending moment can be transmitted, and the overall performance of the laminated slab is improved.
The length of the separated joint 3 is the same as that of the precast slab 1, and the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 of the adjacent precast slabs are in one-to-one correspondence.
In one embodiment of the invention, the precast slab 1 is also internally provided with longitudinal prestressed tendons 1-1, transverse distributed steel bars 1-2 and steel bar meshes 1-5. The longitudinal prestressed tendons 1-1 are arranged at equal intervals, and the longitudinal prestressed tendons 1-1 are connected with the precast slabs 1 in the transverse direction. The transverse distribution steel bars 1-2 are provided with a plurality of steel bar meshes 1-5, the steel bar meshes 1-5 are at least arranged at two ends of the precast slab 1 and are vertical to the longitudinal prestressed steel bars 1-1, and the longitudinal prestressed steel bars 1-1 and the transverse distribution steel bars 1-2 are coated in common concrete 1-6.
Illustratively, the distance between a longitudinal prestressed tendon 1-1 and the bottom of a precast slab 1 is 15mm, two pieces of steel bar net pieces 1-5 are arranged in the length range of 10d at the end part of the precast slab 1 and not less than 100mm, wherein d is the nominal diameter of the longitudinal prestressed tendon 1-1, the width of a transverse deep groove 1-3 is 30mm, and the depth is 45 mm; the width of the transverse shallow grooves 1-4 is 30mm, the depth is 30mm, and the transverse shallow grooves are designed according to the diameters of 20mm and 25mm of common embedded pipelines. The number of the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 is designed according to the longitudinal shearing force borne by the overlapped surface.
In one embodiment of the invention, the cast-in-place layer 2 further comprises equally spaced longitudinal stressed steel bars 2-4 arranged on the top of the precast slab 1, and ultra-high performance concrete 2-5 fills the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 and coats the transverse distributed steel bars 2-3 and the longitudinal stressed steel bars 2-4. Illustratively, the ultra high performance concrete 2-5 has a thickness of 25mm at the top of the precast slab 1.
Referring to fig. 2 to 4, in the present invention, the end anchor transverse bar 2-1 and the transverse distribution reinforcing bar 2-3 are straight bars, and the reinforcing bar 2-2 is composed of a bottom straight bar, two upward-inclined bars respectively connected to both ends of the bottom straight bar, and two top straight bars respectively connected to top ends of the two upward-inclined bars. Wherein, the bottom straight rib is positioned above the end anchor transverse rib 2-1, and the top straight rib extends into the cast-in-situ layer 2.
The construction method of the invention comprises the following steps:
firstly, erecting a precast slab 1 template in a factory, wherein a transverse deep groove 1-3 and a transverse shallow groove 1-4 are arranged at the top of the precast slab 1, and end holes are reserved in the length direction of the template and used for inserting longitudinal prestressed tendons 1-1. And binding and fixing the transversely distributed steel bars 1-2, the steel bar net sheets 1-5 and the longitudinal prestressed tendons 1-1 according to preset positions, wherein one end of the longitudinal prestressed tendons 1-1 is fixed on the fixed pedestal, and the other end of the longitudinal prestressed tendons 1-1 penetrates through the fixed cross beam, the jack and the movable cross beam. And (4) pushing the movable cross beam by using a jack, and tensioning the longitudinal prestressed tendons 1-1. After tensioning is finished, pouring, vibrating and maintaining common concrete 1-6, when the cubic concrete compressive strength reaches 75% of a design value, loosening the longitudinal prestressed tendons 1-1, and when the cubic concrete compressive strength reaches 100% of the design value, removing the formwork to complete the manufacture of the prefabricated slab 1 with the shear groove key UHPC-NC laminated slab connected by the separated seams;
then, hoisting the precast slab 1 in place on site, arranging end anchor transverse ribs 2-1 and reinforcing ribs 2-2 in the transverse deep grooves 1-3 corresponding to the separated joints 3, arranging pipelines in partial transverse deep grooves 1-3 and partial transverse shallow grooves 1-4 according to design, arranging transverse distribution reinforcing ribs 2-3 in the transverse shallow grooves 1-4 and equidistant longitudinal stress reinforcing ribs 2-4 on the slab top of the precast slab 1, pouring ultrahigh-performance concrete 2-5 to fill the transverse deep grooves 1-3 and the transverse shallow grooves 1-4 and coat the transverse distribution reinforcing ribs 2-3 and the longitudinal stress reinforcing ribs 2-4, and continuously pouring 25 mm-thick ultrahigh-performance concrete 2-5 to complete the manufacture of the UHPC-NC laminated slab with the shear groove keys connected by the separated joints.
On the basis of the separated joint laminated slab, the UHPC-NC shear groove key is adopted, so that the contact area between the prefabricated slab and the cast-in-place layer is increased, the adhesive force between the prefabricated slab and the cast-in-place layer is enhanced, and the longitudinal shear resistance of the laminated surface is improved; the ultra-high performance concrete is adopted as a cast-in-place layer, and the advantages of high compressive strength, good durability, strong bonding force, better wrapping property of the reinforcing steel bar compared with common concrete with the same thickness and the like are fully utilized; the transmission of shearing force and bending moment at the separated seam is enhanced by using the end anchor transverse rib and the reinforcing rib; meanwhile, the construction process is simplified, the assembly is convenient and fast, the on-site hoisting requirement is met, and the method is a good prefabricating and assembling method. According to the design method of the UHPC-NC laminated slab with the shear groove keys in the separated seam connection, provided by the invention, the structure stress performance can be further improved, the integrity is reliable, the construction efficiency is improved, and the construction cost is saved.
Claims (10)
1. A split type seam-connected UHPC-NC laminated slab with shear groove keys is characterized by comprising prefabricated slabs (1) and cast-in-place layers (2), wherein the adjacent prefabricated slabs (1) are connected by adopting split type seams (3) in the longitudinal direction;
the precast slab (1) is a slab main body poured by common concrete (1-6), and a plurality of transverse deep grooves (1-3) and transverse shallow grooves (1-4) are reserved on the slab top;
the cast-in-place layer (2) comprises end anchor transverse ribs (2-1), reinforcing ribs (2-2), transversely distributed reinforcing steel bars (2-3) and cast-in-place ultrahigh-performance concrete (2-5), the end anchor transverse ribs (2-1) are arranged in transverse deep grooves (1-3) of adjacent prefabricated plates (1) in a penetrating mode, the reinforcing ribs (2-2) are arranged between end portions of the transverse deep grooves (1-3) of the adjacent prefabricated plates (1), the transversely distributed reinforcing steel bars (2-3) are arranged in transverse shallow grooves (1-4) of the adjacent prefabricated plates (1) in a penetrating mode, namely the end anchor transverse ribs (2-1), the reinforcing ribs (2-2) and the transversely distributed reinforcing steel bars (2-3) all span the separated type seams (3).
2. The UHPC-NC laminated slab with the shear groove key for the separable joint connection according to claim 1, wherein longitudinal pre-stressed tendons (1-1), transverse distributed steel tendons (1-2) and steel mesh sheets (1-5) are arranged in the prefabricated slab (1); the longitudinal prestressed tendons (1-1) are arranged at equal intervals, the transverse distributed reinforcing steel bars (1-2) are arranged on the longitudinal prestressed tendons (1-1) at equal intervals, and the reinforcing steel bar net pieces (1-5) are arranged at two ends of the prefabricated slab (1) and are perpendicular to the longitudinal prestressed tendons (1-1).
3. A split joint-joined UHPC-NC laminated slab with shear keys according to claim 2, characterized in that said longitudinal tendons (1-1) and transverse distribution tendons (1-2) are encased by said ordinary concrete (1-6).
4. The UHPC-NC laminated slab with the shear groove key in the breakaway joint connection according to claim 2, wherein the distance between the longitudinal tendon (1-1) and the bottom of the prefabricated slab (1) is 15mm, and two pieces of steel bar net sheets (1-5) are arranged in the length range of 10d and not less than 100mm at the end of the prefabricated slab (1), wherein d is the nominal diameter of the longitudinal tendon (1-1), and the width of the transverse deep groove (1-3) is 30mm and the depth is 45 mm; the width of the transverse shallow groove (1-4) is 30mm, the depth of the transverse shallow groove is 30mm, and the thickness of the ultra-high performance concrete (2-5) on the top of the precast slab (1) is 25 mm.
5. Split joint-jointed UHPC-NC superimposed slab according to claim 1 or 2 or 3 or 4, characterised in that the deep transverse grooves (1-3) are arranged alternately with the shallow transverse grooves (1-4).
6. The UHPC-NC composite slab with the split seam connection according to claim 1, wherein the cast-in-place layer (2) further comprises equally spaced longitudinal stress steel bars (2-4) disposed on the top of the precast slab (1), and the ultra high performance concrete (2-5) fills the transverse deep grooves (1-3) and the transverse shallow grooves (1-4) and covers the transverse distribution steel bars (2-3) and the longitudinal stress steel bars (2-4).
7. A split seam-joined UHPC-NC laminated slab with shear keys according to claim 1 wherein the transverse end anchor bars (2-1) and the transverse distribution bars (2-3) are straight bars, and the reinforcing bars (2-2) are composed of a bottom straight bar, two upward-inclined bars connected to both ends of the bottom straight bar, respectively, and two top straight bars connected to the tops of the two upward-inclined bars, respectively.
8. A split seam-joined UHPC-NC laminated slab with shear keys according to claim 7, characterized in that the bottom straight rib is located above the end anchor transverse rib (2-1), and the top straight rib extends into the cast-in-place layer (2).
9. A method of constructing a split joint UHPC-NC composite with shear keys according to claim 1, comprising the steps of:
step 1), erecting a precast slab (1) template in a factory, reserving transverse deep grooves (1-3) and transverse shallow grooves (1-4) in the template, and pouring by using common concrete (1-6);
and 2), hoisting the precast slab (1) in place on site, arranging end anchor transverse ribs (2-1) and reinforcing ribs (2-2) in the transverse deep grooves (1-3) corresponding to the separated joints (3), arranging transverse distribution reinforcing steel bars (2-3) in the transverse shallow grooves (1-4), pouring ultrahigh-performance concrete (2-5) to fill the transverse deep grooves (1-3) and the transverse shallow grooves (1-4) and coat the transverse distribution reinforcing steel bars (2-3), and continuously pouring the ultrahigh-performance concrete (2-5) to finish manufacturing.
10. The construction method according to claim 9, wherein in step 1), end holes are reserved in the length direction of the formwork for inserting longitudinal prestressed tendons (1-1), the transversely distributed steel bars (1-2), the steel bar meshes (1-5) and the longitudinal prestressed tendons (1-1) are bound and fixed according to preset positions, one end of each longitudinal prestressed tendon (1-1) is fixed on the fixed pedestal, the other end of each longitudinal prestressed tendon (1-1) penetrates through the fixed cross beam, the jack and the movable cross beam, the movable cross beam is pushed by the jack, the longitudinal prestressed tendons (1-1) are tensioned, after tensioning is finished, pouring, vibrating and maintaining of common concrete (1-6) are carried out, when the cubic concrete compressive strength reaches 75% of a designed value, the longitudinal prestressed tendons (1-1) are loosened, and when the cubic concrete compressive strength reaches 100% of the designed value, the formwork is removed, completing the manufacture of the prefabricated slab (1);
and 2), pipelines are arranged in part of the transverse deep grooves (1-3) and part of the transverse shallow grooves (1-4), transverse distribution reinforcing steel bars (2-3) in the transverse shallow grooves (1-4) and equidistant longitudinal stress reinforcing steel bars (2-4) on the plate top of the precast slab (1) are arranged, and ultrahigh-performance concrete (2-5) is poured to fill the transverse deep grooves (1-3) and the transverse shallow grooves (1-4) and to coat the transverse distribution reinforcing steel bars (2-3) and the longitudinal stress reinforcing steel bars (2-4).
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| CN202210013361.4A CN114215249A (en) | 2022-01-06 | 2022-01-06 | Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115928558A (en) * | 2023-02-21 | 2023-04-07 | 湖南大学 | Transverse joint structure of UHPC combined box girder and construction method thereof |
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