CN112922205A - Construction process and structure for close splicing and strong joint of two-way superimposed sheet - Google Patents
Construction process and structure for close splicing and strong joint of two-way superimposed sheet Download PDFInfo
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- CN112922205A CN112922205A CN202110116886.6A CN202110116886A CN112922205A CN 112922205 A CN112922205 A CN 112922205A CN 202110116886 A CN202110116886 A CN 202110116886A CN 112922205 A CN112922205 A CN 112922205A
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- 238000010276 construction Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 175
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 141
- 239000010959 steel Substances 0.000 claims abstract description 141
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 56
- 230000006835 compression Effects 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 11
- 210000003205 muscle Anatomy 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 66
- 239000002131 composite material Substances 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 9
- 238000004873 anchoring Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 238000010008 shearing Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 2
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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
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Abstract
The invention discloses a close-splicing strong-joint structure of a two-way laminated slab, which comprises a prefabricated slab and a cast-in-place layer, wherein a bottom plate reinforcing steel bar and a bottom plate connecting steel bar are arranged in the prefabricated slab, the bottom plate reinforcing steel bar comprises a bottom plate stressed reinforcing steel bar and a bottom plate fixing reinforcing steel bar, the bottom plate fixing reinforcing steel bar is close to a joint of the prefabricated slab, and the bottom plate fixing reinforcing steel bar is bent upwards and extends out of the surface of the; additional steel bars and top plate compression steel bars are longitudinally paved in the cast-in-situ layer, and two adjacent additional steel bars are connected with one top plate compression steel bar through connecting web bars; the additional reinforcing steel bars are perpendicular to the splicing seams, additional fixing reinforcing steel bars are further arranged at two ends of the additional reinforcing steel bars, and the additional fixing reinforcing steel bars are arranged in the vertical direction; the roof splice bar is along transversely and overlapping with roof pressurized reinforcing bar and lay. The invention has strong integrity and bearing capacity and high stability of the laminated slab near the abutted seam.
Description
Technical Field
The invention relates to a splicing process and a splicing structure of concrete composite slabs, in particular to a construction process and a structure for close splicing and strong joint of two-way composite slabs.
Background
The concrete laminated slab is widely applied in engineering practice as a good combination form of a precast slab and a cast-in-place slab. But the development of the concrete laminated slab is restricted due to the existence of the splicing problem among the precast slabs. The existing separated type spliced seam laminated slab is easy to tear and damage along the laminated surface at the spliced seam because the bonding force between the prefabricated slab of the laminated surface and the concrete of a cast-in-place layer is not enough. This sudden brittle failure has a serious effect on the stability of the structure.
The 6.6.5 item of the technical specification of prefabricated concrete structures (JGJ1-2014) shows a schematic structural diagram of a separate type seam, as shown in fig. 1, the method is that prefabricated plates 1 are directly spliced together, a certain number of additional steel bars 3 vertical to the seam V are arranged along the seam V on a superposed surface, and then a cast-in-situ layer 2 is poured. The method has the problems that the precast slabs and the cast-in-place layer concrete are connected by natural rough surfaces, and if the bonding force of the new and old concrete is insufficient, the precast slabs and the cast-in-place layer concrete are separated along the superposed surfaces and are torn and damaged. And because the anchoring strength of the additional reinforcing steel bar is low, the additional reinforcing steel bar is easy to slide.
In the prefabricated concrete structure connection node structure 15G310-1, truss reinforcements 4 are additionally arranged on the superposed surface of the precast slab 1 and the cast-in-place layer 2, as shown in fig. 2, but the superposed surface near the abutted seam V is still a weak part.
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is to improve the integrity and the bearing capacity of the superposed surface of the precast slab and the cast-in-place slab so as to prevent the superposed surface near the abutted seam from being torn and damaged; the anchoring strength of the additional steel bars needs to be further strengthened; the stability of the laminated panel near the butt seam also needs to be improved.
In order to achieve the purpose, the invention provides a construction process of a dense splicing strong joint of a two-way laminated slab, which comprises the following steps of (1) firstly, paving a bottom plate connecting rib along the transverse direction, paving a bottom plate reinforcing steel bar along the longitudinal direction, superposing the bottom plate reinforcing steel bar and the bottom plate connecting rib and fixing the bottom plate reinforcing steel bar and the bottom plate connecting rib into a bottom plate reinforcing mesh, paving the bottom plate reinforcing mesh in a prefabricated slab template, and bending two ends of the bottom plate reinforcing steel bar upwards and extending out of the poured prefabricated slab surface; placing the truss steel bars and the hanging steel bars on the bottom plate steel bars 3; (2) pouring the precast slab and carrying out wet maintenance on the precast slab; after the maintenance is finished, the prefabricated plates are symmetrically spliced, and a close splicing seam form is adopted between two adjacent prefabricated plates; (3) laying additional steel bars on the upper surface of the precast slab along the longitudinal direction according to the requirement, wherein the additional steel bars are vertical to the abutted seams; two ends of the additional steel bar are bent upwards, and the distribution steel bar is laid transversely and fixedly connected with the bent section of the additional steel bar; laying top plate compression steel bars along the longitudinal direction, and connecting two adjacent additional steel bars with the same top plate compression steel bar through connecting web bars; (4) installing a cast-in-place layer template, and laying top plate connecting ribs on the top plate pressed reinforcing steel bars in a transverse overlapping manner; (5) and pouring cast-in-place layer concrete, and removing the template after the concrete reaches the designed strength after curing.
The invention has the beneficial effects that: (1) the precast slab joints adopt a structure that bottom plate steel bars are bent and extend into a cast-in-place layer, so that tearing damage caused by large cracks along the superposed surface and separation can be effectively prevented, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the bearing capacity of the laminated plate is improved to a certain extent. (3) The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar, has obviously improved the defect that the additional reinforcing bar easily takes place to slide.
Further, (2) the middle part of the additional steel bar is overlapped with the abutted seam to ensure that the additional steel bar is evenly stressed;
(3) two adjacent additional steel bars are lower chords, one top plate pressed steel bar is an upper chord, and a plurality of connecting web ribs are distributed between the upper chord and the lower chord and are fixedly connected in a truss connecting mode; the distribution rib is welded in the middle of the bending section of the additional steel bar on site. The additional steel bars and the top plate compression steel bars form the three-dimensional truss structure through the connecting web ribs, so that the stability of the laminated slab is further enhanced.
Therefore, the construction process for the close-splicing strong joint of the two-way composite slab has the advantages that: (1) the precast slab joints adopt a structure that bottom plate steel bars are bent and extend into a cast-in-place layer, so that tearing damage caused by large cracks along the superposed surface and separation can be effectively prevented, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the bearing capacity of the laminated plate can be further improved. (3) The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar, has obviously improved the defect that the additional reinforcing bar easily takes place to slide. (4) The additional reinforcing steel bars and the top plate pressed reinforcing steel bars form the structure of the three-dimensional truss through the connecting web bars, and the additional reinforcing steel bars are bent and anchored into the cast-in-place layer, so that the stressed reinforcing steel bars and the additional reinforcing steel bars can better participate in stress, and the stability of the laminated slab is further enhanced.
The invention provides another construction process for close-splicing strong joints of two-way superimposed sheets,
(1) firstly, transversely laying bottom plate connecting ribs, longitudinally laying bottom plate reinforcing steel bars, superposing the bottom plate reinforcing steel bars and the bottom plate connecting ribs and fixing the bottom plate reinforcing steel bars and the bottom plate connecting ribs into a bottom plate reinforcing mesh, laying the bottom plate reinforcing mesh in a prefabricated plate template, and bending two ends of the bottom plate reinforcing steel bars upwards and extending out of a poured prefabricated plate surface; placing the truss reinforcing steel bars and the hanging reinforcing steel bars on the bottom plate reinforcing steel bar net;
(2) pouring the precast slab and carrying out wet maintenance on the precast slab; after the maintenance is finished, the prefabricated plates are symmetrically spliced, and a close splicing seam form is adopted between two adjacent prefabricated plates;
(3) laying a plurality of additional trusses vertical to the splicing seams on the upper surface of the prefabricated slab along the longitudinal direction according to requirements, wherein the additional trusses are of a three-dimensional truss structure and consist of two lower chords, an upper chord and a plurality of connecting web ribs positioned between the upper chord and the lower chord; the two ends of the lower chord are bent upwards, and the distribution ribs are transversely laid and fixedly connected with the bent sections of the lower chord;
(4) installing a cast-in-situ layer template, laying a top plate reinforcing mesh at a required position and ensuring that the top plate reinforcing mesh is in the cast-in-situ layer;
(5) and pouring cast-in-place layer concrete, and removing the template after the concrete reaches the designed strength after curing.
The construction process for the close-splicing strong joint of the two-way superimposed sheet has the beneficial effects that: (1) the precast slab joints adopt a structure that bottom plate steel bars are bent and extend into a cast-in-place layer, so that tearing damage caused by large cracks along the superposed surface and separation can be effectively prevented, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the bearing capacity of the laminated plate is improved to a certain extent. (3) The stress of the abutted seam is further improved by the structure of the additional truss, and the additional truss can better participate in the stress in a mode that two ends of the additional truss are bent and anchored into the cast-in-place layer, so that the stability of the laminated slab formed by the prefabricated slab and the cast-in-place slab is further enhanced.
The invention also provides a close-splicing strong-joint structure of the two-way composite slab, which comprises a precast slab and a cast-in-place layer, wherein the cast-in-place layer is poured on the precast slab after the precast slab is spliced; the prefabricated slab is internally provided with longitudinally laid bottom plate reinforcing steel bars and transversely laid bottom plate connecting steel bars, and the truss reinforcing steel bars are transversely laid on the bottom plate reinforcing steel bars; the bottom plate reinforcing steel bars comprise bottom plate stressed reinforcing steel bars and bottom plate fixing reinforcing steel bars, the bottom plate fixing reinforcing steel bars are close to the splicing seams of the prefabricated plates, and the bottom plate fixing reinforcing steel bars are bent upwards and extend out of the prefabricated plate surfaces; additional steel bars and top plate compression steel bars are longitudinally paved in the cast-in-situ layer, and two adjacent additional steel bars are connected with one top plate compression steel bar through connecting web bars; the additional reinforcing steel bars are perpendicular to the splicing seams, additional fixing reinforcing steel bars are further arranged at two ends of the additional reinforcing steel bars, and the additional fixing reinforcing steel bars are arranged in the vertical direction; the roof splice bar is along transversely and overlapping with roof pressurized reinforcing bar and lay.
Has the advantages that: (1) the prefabricated slab joints adopt a structure that bottom plate steel bars are bent and extend into the cast-in-place layer, so that the prefabricated slab and the cast-in-place layer are tightly connected, the large cracks at the joints along the superposed surface are effectively prevented from being torn and damaged by separation, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the shearing resistance of the overlapped surface is effectively enhanced, the upper load of the overlapped plate is jointly borne by the additional reinforcing steel bars and the bottom plate reinforcing steel bars, and the bearing capacity is remarkably improved. The load-bearing capacity of the laminate can be further improved. (3) The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar, has obviously improved the defect that the additional reinforcing bar easily takes place to slide. (4) The additional reinforcing steel bars and the top plate pressed reinforcing steel bars form the structure of the three-dimensional truss through the connecting web bars, and the additional reinforcing steel bars are bent and anchored into the cast-in-place layer, so that the stressed reinforcing steel bars and the additional reinforcing steel bars can better participate in stress, and the stability of the laminated slab is further enhanced.
Furthermore, the diameter and the strength grade of the connecting web rib are smaller than those of the compressed steel bar and the additional steel bar of the top plate. Because the connecting web rib is stressed little and needs to be bent into sawtooth waves, the diameter and the strength of the connecting web rib are small, the processing is easy, and the material waste is avoided.
Further, the top end of the bottom plate fixing steel bar and the top end of the additional fixing steel bar are positioned at the same horizontal height. Because the fixed reinforcing bar of bottom plate and the degree of depth that additional fixed reinforcing bar anchored into cast-in-place layer are unanimous, highly uniform, easy standardized construction. The connecting web ribs are distributed between the connecting ribs of the bottom plate and the additional fixed reinforcing steel bars.
Further, still including the distribution muscle, the distribution muscle is along transversely setting up, and distribution muscle and additional fixed steel bar fixed connection can further fix additional reinforcing bar.
Furthermore, the distance between the bottom plate connecting ribs and the abutted seams is 15-20 mm, so that the bottom plate connecting ribs have certain protective layer thickness, the distance between the bottom plate connecting ribs and the abutted seams is moderate, and the connecting force of the bottom plate connecting ribs can be effectively exerted.
Therefore, the close-splicing strong-joint structure of the bidirectional composite slab has the beneficial effects that: (1) the prefabricated slab joints adopt a structure that bottom plate steel bars are bent and extend into the cast-in-place layer, so that the prefabricated slab and the cast-in-place layer are tightly connected, the large cracks at the joints along the superposed surface are effectively prevented from being torn and damaged by separation, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the shearing resistance of the overlapped surface is effectively enhanced, the upper load of the overlapped plate is jointly borne by the additional reinforcing steel bars and the bottom plate reinforcing steel bars, and the bearing capacity is remarkably improved. The load-bearing capacity of the laminate can be further improved. (3) The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar, has obviously improved the defect that the additional reinforcing bar easily takes place to slide. (4) The additional reinforcing steel bars and the top plate pressed reinforcing steel bars form the structure of the three-dimensional truss through the connecting web bars, and the additional reinforcing steel bars are bent and anchored into the cast-in-place layer, so that the stressed reinforcing steel bars and the additional reinforcing steel bars can better participate in stress, and the stability of the laminated slab is further enhanced.
The invention provides another close-splicing strong-joint structure of a two-way laminated slab, which comprises a prefabricated slab and a cast-in-place layer, wherein the cast-in-place layer is poured on the prefabricated slab after the prefabricated slab is spliced; the prefabricated slab is internally provided with longitudinally laid bottom plate reinforcing steel bars and transversely laid bottom plate connecting steel bars, and the truss reinforcing steel bars are transversely laid on the bottom plate reinforcing steel bars; the bottom plate reinforcing steel bars comprise bottom plate stressed reinforcing steel bars and bottom plate fixing reinforcing steel bars, the bottom plate fixing reinforcing steel bars are close to the splicing seams of the prefabricated plates, and the bottom plate fixing reinforcing steel bars are bent upwards and extend out of the prefabricated plate surfaces; a plurality of additional trusses are longitudinally paved in the cast-in-place layer and are vertical to the abutted seams; the additional truss comprises two lower chords, an upper chord and a plurality of connecting web bars positioned between the upper chord and the lower chord, and additional fixed steel bars are also arranged at two ends of the lower chord and are arranged along the vertical direction; and a top plate reinforcing mesh is laid above the additional truss.
Has the advantages that: (1) the prefabricated slab joints adopt a structure that bottom plate steel bars are bent and extend into the cast-in-place layer, so that the prefabricated slab and the cast-in-place layer are tightly connected, the large cracks at the joints along the superposed surface are effectively prevented from being torn and damaged by separation, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the shearing resistance of the overlapped surface is effectively enhanced, the upper load of the overlapped plate is jointly borne by the additional reinforcing steel bars and the bottom plate reinforcing steel bars, and the bearing capacity is remarkably improved. The load-bearing capacity of the laminate can be further improved. (3) The structure that the both ends of lower chord member are bent up can effectively strengthen the anchor strength of additional truss, prevents that the lower chord member from taking place to slide. (4) The additional truss with the three-dimensional structure and the mode that the lower chord is bent and anchored into the cast-in-place layer are adopted, so that the upper chord and the lower chord can better participate in stress, and the stability of the laminated slab is further enhanced.
Furthermore, the diameter and the strength grade of the steel bar of the connecting web rib are smaller than those of the lower chord and the lower chord.
Furthermore, the top end of the bottom plate connecting rib and the top end of the additional fixed reinforcing steel bar are positioned at the same horizontal height, and the bottom plate fixed reinforcing steel bar and the additional fixed reinforcing steel bar are anchored into the cast-in-place layer at the same depth, so that the heights are uniform, standardized construction is easy, and the construction efficiency can be improved.
Further, still include the distribution muscle, the distribution muscle is along transversely setting up, and distribution muscle and additional fixed reinforcing bar fixed connection can further fix additional reinforcing bar or additional truss.
Furthermore, the distance between the bottom plate connecting ribs and the abutted seams is 15-20 mm, so that the bottom plate connecting ribs have certain protective layer thickness, the distance between the bottom plate connecting ribs and the abutted seams is moderate, and the connecting force of the bottom plate connecting ribs can be effectively exerted.
Therefore, the close-splicing strong-joint structure of the bidirectional composite slab has the beneficial effects that: (1) the prefabricated slab joints adopt a structure that bottom plate steel bars are bent and extend into the cast-in-place layer, so that the prefabricated slab and the cast-in-place layer are tightly connected, the large cracks at the joints along the superposed surface are effectively prevented from being torn and damaged by separation, and the integrity and the safety of the structure are enhanced. (2) Because the structure that the bottom plate reinforcing steel bars stretch into the cast-in-place layer enables the stress of the bottom plate reinforcing steel bars to be more sufficient, the shearing resistance of the overlapped surface is effectively enhanced, the upper load of the overlapped plate is jointly borne by the additional reinforcing steel bars and the bottom plate reinforcing steel bars, and the bearing capacity is remarkably improved. The load-bearing capacity of the laminate can be further improved. (3) The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar, has obviously improved the defect that the additional reinforcing bar easily takes place to slide. (4) The additional reinforcing steel bars and the top plate pressed reinforcing steel bars form the structure of the three-dimensional truss through the connecting web bars, and the additional reinforcing steel bars are bent and anchored into the cast-in-place layer, so that the stressed reinforcing steel bars and the additional reinforcing steel bars can better participate in stress, and the stability of the laminated slab is further enhanced.
Drawings
FIG. 1 is a schematic view of a split seam construction of the prior art;
FIG. 2 is a patchwork configuration as set forth in FIG. 15G310-1 of the background art;
FIG. 3 is a front cross-sectional view of a third laminated plate according to an embodiment of the present invention;
FIG. 4 is a front cross-sectional view of a fourth embodiment of a bi-directional laminated panel tight splice joint according to the present invention;
FIG. 5 is a top view of a post-cast layer of a laminated slab in a close-coupled and strong-jointed joint of a bidirectional laminated slab according to the present invention;
FIG. 6 is a top view of a bi-directional composite close-coupled strong joint of the present invention with additional trusses in its construction.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein it is noted that, in the description of the invention, the terms "upper", "lower", "lateral", "longitudinal", "inner", "outer", and the like, refer to orientations and positional relationships illustrated in the drawings, which are used for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular manner, and thus should not be construed as limiting the invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first embodiment:
a construction process for a close-splicing strong joint of a two-way laminated slab comprises the following steps of (1) firstly, transversely laying a bottom plate connecting rib, longitudinally laying a bottom plate reinforcing steel bar, superposing and binding the bottom plate reinforcing steel bar and the bottom plate connecting rib to form a bottom plate reinforcing steel bar net, and laying the bottom plate reinforcing steel bar net in a prefabricated slab template; the two ends of the bottom plate steel bar are bent upwards and extend out of the poured prefabricated plate surface, so that the bottom plate steel bar can extend into the cast-in-place layer to enhance the integrity and safety of the structure and effectively prevent the abutted seam from generating larger cracks along the superposed surface so as to be torn and damaged; and finally, placing the truss reinforcing steel bars and the hanging reinforcing steel bars on the bottom plate reinforcing steel bar net.
Pouring the precast slab and carrying out wet maintenance on the precast slab; after maintenance is finished, the prefabricated plates are symmetrically spliced, a close splicing seam form is adopted between two adjacent prefabricated plates, the close splicing seam form is that the two prefabricated plates are tightly connected, a reserved channel is not arranged in the middle, and a stress form of additional reinforcing steel bars is laid above the prefabricated plates.
Laying additional steel bars on the upper surface of the prefabricated slab along the longitudinal direction according to requirements, wherein the additional steel bars are vertical to the abutted seams; the two ends of the additional reinforcing steel bars are bent upwards, and the distribution ribs are transversely paved and fixedly connected with the bent sections of the additional reinforcing steel bars. The structure that the both ends of additional reinforcing bar are bent up can effectively strengthen the anchor strength of additional reinforcing bar. The top plate compression reinforcing steel bars are located above the additional reinforcing steel bars and are laid along the longitudinal direction, and two adjacent additional reinforcing steel bars are connected with the same top plate compression reinforcing steel bar through the connecting web bars.
And (4) installing a cast-in-situ layer template, transversely paving a top plate connecting rib on the top plate compressed steel bar, and binding the top plate compressed steel bar and the top plate connecting rib into a top plate steel bar mesh in an overlapped mode, wherein the top plate steel bar mesh is required to be ensured in the cast-in-situ layer.
And (5) pouring cast-in-place layer concrete, and removing the template after the concrete is maintained to reach the designed strength.
In order to further enhance the stability of the laminated slab at the abutted seam, the additional steel bars, the top plate compression steel bars and the connecting web bars form a three-dimensional truss structure,
in the step (2), the middle part of the additional steel bar is overlapped with the abutted seam so as to ensure that the additional steel bar is evenly stressed.
In the step (3), a plurality of connecting web ribs are distributed between two adjacent additional steel bars as a lower chord and a top plate stressed steel bar as an upper chord and between the upper chord and the lower chord to form a three-dimensional truss structure. The additional steel bars are tightly connected with the cast-in-place layer by using the truss structure, so that the stability of the laminated slab is greatly improved, and the strength of the steel bars is fully exerted. The length of the additional reinforcing steel bar is the same as that of the top plate compression reinforcing steel bar, and the distribution rib is welded in the middle of the bending section of the additional reinforcing steel bar on site.
Second embodiment:
a construction process for a close-splicing strong joint of a two-way laminated slab comprises the following steps of (1) firstly, transversely laying a bottom plate connecting rib, longitudinally laying a bottom plate reinforcing steel bar, superposing and binding the bottom plate reinforcing steel bar and the bottom plate connecting rib to form a bottom plate reinforcing steel bar net, and laying the bottom plate reinforcing steel bar net in a prefabricated slab template; the two ends of the bottom plate steel bar are bent upwards and extend out of the poured prefabricated plate surface, so that the bottom plate steel bar can extend into the cast-in-place layer to enhance the integrity and safety of the structure and effectively prevent the abutted seam from generating larger cracks along the superposed surface so as to be torn and damaged; and finally, placing the truss reinforcing steel bars and the hanging reinforcing steel bars on the bottom plate reinforcing steel bar net.
Pouring the precast slab and carrying out wet maintenance on the precast slab; after maintenance is finished, the prefabricated plates are symmetrically spliced, a close splicing seam form is adopted between two adjacent prefabricated plates, the close splicing seam form is that the two prefabricated plates are tightly connected, a reserved channel is not arranged in the middle, and a stress form of additional reinforcing steel bars is laid above the prefabricated plates.
And (3) laying a plurality of additional trusses vertical to the splicing seams on the upper surface of the prefabricated slab along the longitudinal direction according to requirements, wherein the additional trusses are of a three-dimensional truss structure and consist of two lower chords, an upper chord and a plurality of connecting web ribs positioned between the upper chord and the lower chord. The two ends of the lower chord are of an upward bending structure, and the structure can effectively enhance the anchoring strength of the additional truss. The distribution ribs are transversely laid and fixedly connected with the bending sections of the lower chords.
And (4) installing a cast-in-situ layer template, laying the top plate reinforcing mesh at a required position and ensuring that the top plate reinforcing mesh is in the cast-in-situ layer. The top plate reinforcing mesh comprises top plate compression reinforcing steel bars laid longitudinally and top plate connecting steel bars laid transversely.
And (5) pouring cast-in-place layer concrete, and removing the template after the concrete is maintained to reach the designed strength.
In order to further enhance the stability of the laminated slab at the splicing seams, in the step (2), the middle parts of the additional trusses are overlapped with the splicing seams so as to ensure that the additional trusses are uniformly stressed. The additional truss is closely connected with the cast-in-place layer, so that the stability of the laminated slab at the abutted seam is greatly improved, and the strength of the reinforcing steel bar is fully exerted.
In the step (3), the distribution rib is welded or bound in the middle of the bending section of the additional reinforcing steel bar on site.
The third embodiment:
as shown in figure 3, the close-spliced strong-joint structure of the two-way composite slab comprises a prefabricated slab 1 and a cast-in-place layer 2, wherein the cast-in-place layer 2 is poured on the prefabricated slab 1 after the prefabricated slab 1 is spliced in a mirror symmetry mode. The prefabricated slab 1 is internally provided with a bottom plate steel bar 5 which is longitudinally laid and a bottom plate connecting bar 6 which is transversely laid, and the bottom plate steel bar 5 and the bottom plate connecting bar 6 are fixed into a bottom plate steel bar mesh through binding. The truss reinforcing steel bars 4 are transversely laid on the bottom plate reinforcing steel bar net. The end part of the bottom plate steel bar 5 close to the joint V of the prefabricated plate 1 is bent upwards by 90 degrees, the horizontal section is the bottom plate stressed steel bar 5-1, and the vertical section is the bottom plate fixed steel bar 5-2. The bottom plate fixed steel bar 5-2 penetrates through the precast slab 1 and extends into the cast-in-place layer 2, so that the precast slab 1 and the cast-in-place layer 2 are tightly connected, and the tearing damage caused by large cracks generated at the joint V along the superposed surface and further disengagement is effectively prevented; and the stress of the bottom plate steel bars 5 can be more sufficient, and the shearing resistance of the overlapped surface can be effectively enhanced.
The bottom of the cast-in-place layer 2 is longitudinally paved with additional reinforcing steel bars 3 vertical to the abutted seam V, and the top close to the cast-in-place layer 2 is longitudinally paved with top plate compression reinforcing steel bars 7. Two adjacent additional reinforcing bars 3 and a roof compressed reinforcing bar 7 above the adjacent additional reinforcing bars form a set of additional truss reinforcing bars 4, wherein the additional reinforcing bars 3 are lower chords, the roof compressed reinforcing bars 7 are upper chords, and the lower chords are connected with the upper chords through connecting web bars 8. In order to enhance the anchoring strength of the additional steel bar 3, two ends of the additional steel bar 3 are bent upwards by 90 degrees, the horizontal section of the additional steel bar 3 is an additional compression steel bar 3-1, the vertical section of the additional compression steel bar 3 is an additional fixed steel bar 3-2, the length of the additional compression steel bar 3-1 needs to meet the anchoring requirement, and the length of the top plate compression steel bar 7 is the same as that of the additional compression steel bar 3-1. Additional reinforcing bar 3, roof pressurized reinforcement 7 constitute the structure of space truss through connecting web member 8 to and the mode of additional reinforcing bar 3 curved anchor income cast-in-place layer 2, make roof pressurized reinforcement 7, additional reinforcing bar 3 can better participate in the atress, have further strengthened superimposed sheet's stability. And the top plate connecting ribs 9 are transversely laid on the top plate pressed reinforcing steel bars 7 and are bound with the top plate pressed reinforcing steel bars to be fixed into a top plate reinforcing mesh.
Further, the diameter and the strength grade of the connecting web bar 8 are smaller than those of the top plate pressed reinforcing steel bar 7 and the additional reinforcing steel bar 3.
Furthermore, the top end of the bottom plate fixing steel bar 5-2 and the top end of the additional fixing steel bar 3-2 are positioned at the same horizontal height, so that standardized construction is easy. Preferably, the top ends of the bottom plate fixing steel bars 5-2 and the additional fixing steel bars 3-2 are lower than the top plate compression steel bars 7, so that the collision between the top plate compression steel bars 7 and the top ends of the bottom plate fixing steel bars 5-2 or the additional fixing steel bars 3-2 during construction can be avoided. The connecting web ribs 8 are distributed between the bottom plate fixed reinforcing steel bars 5-2 and the additional fixed reinforcing steel bars 3-2. And the collision between the bottom plate fixing steel bar 5-2 and the connecting web rib 8 is avoided during construction. If higher bearing capacity is needed, the connecting web rib 8 can also be continuously distributed between the two additional fixed steel bars 3-2, and the bottom plate fixed steel bar 5-2 extends into the bent part of the connecting web rib 8.
The fourth embodiment:
as shown in fig. 4, 5 and 6, the dense splicing and strong joint structure of the two-way composite slab comprises a prefabricated slab 1 and a cast-in-place layer 2, wherein the cast-in-place layer 2 is poured on the prefabricated slab 1 after the prefabricated slab 1 is spliced in a mirror symmetry mode. The prefabricated slab 1 is internally provided with a bottom plate steel bar 5 which is longitudinally laid and a bottom plate connecting bar 6 which is transversely laid, and the bottom plate steel bar 5 and the bottom plate connecting bar 6 are fixed into a bottom plate steel bar mesh through binding. The truss reinforcing steel bars 4 are transversely laid on the bottom plate reinforcing steel bar net. And top plate compression reinforcements 7 are laid at the top ends of the truss reinforcements 4, and top plate connecting reinforcements 9 are transversely laid on the top plate compression reinforcements 7 and are bound with the top plate compression reinforcements to form a top plate reinforcement mesh. The end part of the bottom plate steel bar 5 close to the joint V of the prefabricated plate 1 is bent upwards by 90 degrees, the horizontal section is the bottom plate stressed steel bar 5-1, and the vertical section is the bottom plate fixed steel bar 5-2. The bottom plate fixed steel bar 5-2 penetrates through the precast slab 1 and extends into the cast-in-place layer 2, so that the precast slab 1 and the cast-in-place layer 2 are tightly connected, and the tearing damage caused by large cracks generated at the joint V along the superposed surface and further disengagement is effectively prevented; and the stress of the bottom plate steel bars 5 can be more sufficient, and the shearing resistance of the overlapped surface can be effectively enhanced.
And a plurality of additional trusses 03 with a three-dimensional structure are longitudinally paved at the bottom of the cast-in-place layer 2 and are vertical to the abutted seam V. The additional truss comprises two lower chords 03a, an upper chord 11 and a plurality of connecting web bars 8 positioned between the upper chord 11 and the lower chord 03a, in order to enhance the anchoring strength of the additional truss 03, two ends of the lower chord 03a are bent upwards by 90 degrees, the horizontal section of the lower chord 03a is additional compression steel bars 3-1, and the vertical section is additional fixing steel bars 3-2. The length of the additional compression steel bar 3-1 needs to meet the anchoring requirement, so that the additional truss 03 adopts a mode of bending and anchoring into the cast-in-place layer 2, the lower chord 03a and the upper chord 11 can better participate in stress, and the stability of the laminated slab is further enhanced. The length of the upper chord 11 is the same as that of the additional pressed reinforcing steel bar 3-1, and the diameter and the strength grade of the reinforcing steel bar of the connecting web rib 8 are smaller than those of the lower chord 03a and the upper chord 11. A top plate reinforcing mesh is laid above the additional truss 03 and composed of a top plate connecting rib laid transversely and a top plate compressed reinforcing bar laid longitudinally, and the top plate connecting rib and the top plate compressed reinforcing bar are bound and fixed.
Furthermore, the top end of the bottom plate fixing steel bar 5-2 and the top end of the additional fixing steel bar 3-2 are positioned at the same horizontal height, so that standardized construction is easy. Preferably, the top ends of the bottom plate fixing steel bars 5-2 and the additional fixing steel bars 3-2 are lower than the upper chord 11, and the upper chord 11 is lower than the top plate stressed steel bars 7, so that the collision between the upper chord 11 and the top plate stressed steel bars 7, and between the upper chord 11 and the top ends of the bottom plate fixing steel bars 5-2 or the additional fixing steel bars 3-2 during construction can be avoided. The connecting web ribs 8 are distributed between the bottom plate fixed reinforcing steel bars 5-2 and the additional fixed reinforcing steel bars 3-2. And the collision between the bottom plate fixing steel bar 5-2 and the connecting web rib 8 is avoided during construction. If higher bearing capacity is needed, the connecting web rib 8 can also be continuously distributed between the two additional fixed steel bars 3-2, and the bottom plate fixed steel bar 5-2 extends into the bent part of the connecting web rib 8.
Fifth embodiment:
for further fixation, two distribution ribs 10 perpendicular to the additional fixed reinforcing steel bars 3-2 are transversely arranged, the distribution ribs 10 are respectively bound or welded and fixed with the additional fixed reinforcing steel bars 3-2 at two sides of the abutted seam, and the bound or welded part is positioned in the middle of the additional fixed reinforcing steel bars 3-2.
The distance between the bottom plate connecting rib 6 and the abutted seam V is 15-20 mm. The distance between the connecting web 8 and the connecting point of the additional steel bar 3 (lower chord) is preferably between 80mm and 100 mm. The remaining technical features are the same as those of the third embodiment or the fourth embodiment.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A construction process for a dense splicing and strong joint of a bidirectional laminated slab is characterized by comprising the following steps:
(1) firstly, transversely laying bottom plate connecting ribs, longitudinally laying bottom plate reinforcing steel bars, superposing the bottom plate reinforcing steel bars and the bottom plate connecting ribs and fixing the bottom plate reinforcing steel bars and the bottom plate connecting ribs into a bottom plate reinforcing mesh, laying the bottom plate reinforcing mesh in a prefabricated plate template, and bending two ends of the bottom plate reinforcing steel bars upwards and extending out of a poured prefabricated plate surface; placing the truss reinforcing steel bars and the hanging reinforcing steel bars on the bottom plate reinforcing steel bar net;
(2) pouring the precast slab and carrying out wet maintenance on the precast slab; after the maintenance is finished, the prefabricated plates are symmetrically spliced, and a close splicing seam form is adopted between two adjacent prefabricated plates;
(3) laying additional steel bars on the upper surface of the precast slab along the longitudinal direction according to the requirement, wherein the additional steel bars are vertical to the abutted seams; two ends of the additional steel bar are bent upwards, and the distribution steel bar is laid transversely and fixedly connected with the bent section of the additional steel bar; laying top plate compression steel bars along the longitudinal direction, and connecting two adjacent additional steel bars with the same top plate compression steel bar through connecting web bars;
(4) installing a cast-in-place layer template, and laying top plate connecting ribs on the top plate pressed reinforcing steel bars in a transverse overlapping manner;
(5) and pouring cast-in-place layer concrete, and removing the template after the concrete reaches the designed strength after curing.
2. The construction process of the close-fit strong joint of the two-way superimposed sheet as claimed in claim 1, characterized in that:
overlapping the middle part of the additional steel bar with the abutted seam in the step (2);
step (3) two adjacent additional steel bars are lower chords, one top plate stressed steel bar is an upper chord, and a plurality of connecting web ribs are distributed between the upper chord and the lower chord and fixedly connected in a truss connecting mode; the distribution rib is welded in the middle of the bending section of the additional steel bar on site.
3. A construction process for a dense splicing and strong joint of a bidirectional laminated slab is characterized by comprising the following steps:
(1) firstly, transversely laying bottom plate connecting ribs, longitudinally laying bottom plate reinforcing steel bars, superposing the bottom plate reinforcing steel bars and the bottom plate connecting ribs and fixing the bottom plate reinforcing steel bars and the bottom plate connecting ribs into a bottom plate reinforcing mesh, laying the bottom plate reinforcing mesh in a prefabricated plate template, and bending two ends of the bottom plate reinforcing steel bars upwards and extending out of a poured prefabricated plate surface; placing the truss reinforcing steel bars and the hanging reinforcing steel bars on the bottom plate reinforcing steel bar net;
(2) pouring the precast slab and carrying out wet maintenance on the precast slab; after the maintenance is finished, the prefabricated plates are symmetrically spliced, and a close splicing seam form is adopted between two adjacent prefabricated plates;
(3) laying a plurality of additional trusses vertical to the splicing seams on the upper surface of the prefabricated slab along the longitudinal direction according to requirements, wherein the additional trusses are of a three-dimensional truss structure and consist of two lower chords, an upper chord and a plurality of connecting web ribs positioned between the upper chord and the lower chord; the two ends of the lower chord are bent upwards, and the distribution ribs are transversely laid and fixedly connected with the bent sections of the lower chord;
(4) installing a cast-in-situ layer template, laying a top plate reinforcing mesh at a required position and ensuring that the top plate reinforcing mesh is in the cast-in-situ layer; the top plate reinforcing mesh comprises top plate compression reinforcing steel bars laid longitudinally and top plate connecting steel bars laid transversely;
(5) and pouring cast-in-place layer concrete, and removing the template after the concrete reaches the designed strength after curing.
4. The utility model provides a close strong seam construction of piecing together of two-way superimposed sheet which characterized by: the prefabricated slab cast-in-place construction method comprises a prefabricated slab and a cast-in-place layer, wherein the cast-in-place layer is poured on the prefabricated slab after the prefabricated slab is spliced; the prefabricated slab is internally provided with longitudinally laid bottom plate reinforcing steel bars and transversely laid bottom plate connecting steel bars, and the truss reinforcing steel bars are transversely laid on the bottom plate reinforcing steel bars; the bottom plate reinforcing steel bars comprise bottom plate stressed reinforcing steel bars and bottom plate fixing reinforcing steel bars, the bottom plate fixing reinforcing steel bars are close to the splicing seams of the prefabricated plates, and the bottom plate fixing reinforcing steel bars are bent upwards and extend out of the prefabricated plate surfaces; additional steel bars and top plate compression steel bars are longitudinally paved in the cast-in-situ layer, and two adjacent additional steel bars are connected with one top plate compression steel bar through connecting web bars; the additional reinforcing steel bars are perpendicular to the splicing seams, additional fixing reinforcing steel bars are further arranged at two ends of the additional reinforcing steel bars, and the additional fixing reinforcing steel bars are arranged in the vertical direction; the roof splice bar is along transversely and overlapping with roof pressurized reinforcing bar and lay.
5. The utility model provides a close strong seam construction of piecing together of two-way superimposed sheet which characterized by: the prefabricated slab cast-in-place construction method comprises a prefabricated slab and a cast-in-place layer, wherein the cast-in-place layer is poured on the prefabricated slab after the prefabricated slab is spliced; the prefabricated slab is internally provided with longitudinally laid bottom plate reinforcing steel bars and transversely laid bottom plate connecting steel bars, and the truss reinforcing steel bars are transversely laid on the bottom plate reinforcing steel bars; the bottom plate reinforcing steel bars comprise bottom plate stressed reinforcing steel bars and bottom plate fixing reinforcing steel bars, the bottom plate fixing reinforcing steel bars are close to the splicing seams of the prefabricated plates, and the bottom plate fixing reinforcing steel bars are bent upwards and extend out of the prefabricated plate surfaces; a plurality of additional trusses are longitudinally paved in the cast-in-place layer and are vertical to the abutted seams; the additional truss comprises two lower chords, an upper chord and a plurality of connecting web bars positioned between the upper chord and the lower chord, and additional fixed steel bars are also arranged at two ends of the lower chord and are arranged along the vertical direction; and a top plate reinforcing mesh is laid above the additional truss.
6. The close-fit strong-joint structure of the two-way superimposed sheet as claimed in claim 4 or 5, wherein: the top end of the bottom plate fixing steel bar and the top end of the additional fixing steel bar are positioned at the same horizontal height; the connecting web ribs are distributed between the bottom plate fixed reinforcing steel bars and the additional fixed reinforcing steel bars.
7. The close-fit strong-joint structure of the two-way superimposed sheet as claimed in claim 4 or 5, wherein: still include the distribution muscle, the distribution muscle is along horizontal setting, distribution muscle and additional fixed steel bar fixed connection.
8. The close-fit strong-joint structure of the two-way superimposed sheet as claimed in claim 4, wherein: the diameter and the strength grade of the connecting web rib are smaller than those of the compressed steel bar and the additional steel bar of the top plate.
9. The close-fit strong-joint structure of the two-way superimposed sheet as claimed in claim 5, wherein: the diameter of the connecting web rib and the strength grade of the steel bar are smaller than those of the lower chord and the lower chord.
10. The close-fit strong-joint structure of the two-way superimposed sheet as claimed in claim 4 or 5, wherein: the distance between the bottom plate connecting rib and the abutted seam is 15-20 mm.
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Application publication date: 20210608 |