CN111851831A - Unbonded prestressed node structure for superposed T-beam under assembled building plate and construction method - Google Patents

Unbonded prestressed node structure for superposed T-beam under assembled building plate and construction method Download PDF

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Publication number
CN111851831A
CN111851831A CN202010433663.8A CN202010433663A CN111851831A CN 111851831 A CN111851831 A CN 111851831A CN 202010433663 A CN202010433663 A CN 202010433663A CN 111851831 A CN111851831 A CN 111851831A
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CN
China
Prior art keywords
superposed
post
unbonded prestressed
laminated
column
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Pending
Application number
CN202010433663.8A
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Chinese (zh)
Inventor
陈征
李维民
李建德
李静
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Jiangsu Yongkun Construction Co Ltd
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Jiangsu Yongkun Construction Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Yongkun Construction Co Ltd filed Critical Jiangsu Yongkun Construction Co Ltd
Priority to CN202010433663.8A priority Critical patent/CN111851831A/en
Publication of CN111851831A publication Critical patent/CN111851831A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/43Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/22Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material with parts being prestressed
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing

Abstract

The invention discloses a construction method for an unbonded prestressed node structure of a superposed T beam under an assembled building plate. An assembly building panel underlap T beam unbonded prestressed node construction comprising: the composite post-cast concrete composite structure comprises a PC structural column, a PC superposed T beam wing plate, unbonded prestressed steel bars, superposed T beam upper overhanging steel bars, a laminated slab, laminated slab truss bars and an integral post-cast concrete surface layer. The construction process flow comprises the following steps: carrying out on-site hoisting construction on the PC structural column; carrying out site hoisting construction on the PC superposed T beam; c. grouting connection of a steel bar sleeve at a post-cast section of a beam-column joint and erection of a template support; d. tensioning and anchoring unbonded prestressed tendons at the end heads of the laminated T-beam wing plates; e. hoisting the prefabricated laminated slab on site, and welding and connecting adjacent truss rib span beams; f. binding longitudinal steel bars on the upper part of the laminated slab, and integrally constructing a post-cast concrete surface layer; g. and (4) removing the template and the integral bracket at the post-pouring section. The invention reduces the construction time by prefabrication, can effectively control the construction precision, and has good anti-seismic effect and low cost.

Description

Unbonded prestressed node structure for superposed T-beam under assembled building plate and construction method
Technical Field
The invention relates to the technical field of building construction, in particular to a prestressed structure connecting node structure and a construction method, and particularly relates to an unbonded prestressed node structure and a construction method for a superposed T beam under an assembled building plate.
Background
In recent years, prefabricated buildings have been widely used with the continuous development and progress of new construction techniques and materials. In many countries where buildings are industrially developed, prefabricated building structures have been subjected to long-term experiments and applications, and modern prefabricated building products have been able to highly integrate various functions of buildings, and the forms and components of the buildings are very delicate. The construction requirement of China is large, the construction speed is high, and the prefabricated building is necessary to be developed, so that the requirements on the prefabricated structure node structure and the hoisting process are higher and higher. The traditional prefabricated structure has high hoisting cost and low hoisting speed and precision, which brings great difficulty to building construction, and the prefabricated building hoisting needs to realize industrial modernization, and further innovative research on the design of detailed structures such as hoisting methods, connection nodes and the like is needed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects in the prior art and provides a unbonded prestressed node structure and a construction method for the superposed T-beam under the assembled building plate, which are convenient to construct, stable in structure and high in reliability.
The technical scheme is as follows: an assembly building panel underlap T beam unbonded prestressed node construction comprising: the concrete post-cast composite structure comprises a PC structural column, a PC superposed T beam, unbonded prestressed steel bars, an overhanging steel bar at the upper part of the superposed T beam, a laminated slab truss rib and an integral post-cast concrete surface layer;
a PC superposed T beam is arranged above the PC structural column;
an unbonded prestressed steel bar is arranged in the PC superposed T beam, an overhanging steel bar is arranged at the upper part of the PC superposed T beam, and a laminated slab is arranged above the PC superposed T beam;
a laminated slab truss rib is arranged above the laminated slab, and the overhanging steel bar is fixedly connected with the laminated slab truss rib;
and an integral post-cast concrete surface layer is arranged above the truss ribs of the laminated slab.
The invention has the further improvement that PC superposed T-beam wing plates are arranged at two ends of the upper part of the PC superposed T-beam, and the PC superposed T-beam wing plates are of an integrated forming structure; the unbonded prestressed reinforcement is arranged in the PC superposed T-beam wing plate.
The invention is further improved in that the superimposed slab truss ribs of two adjacent superimposed slabs are connected by welding at the position of the middle superimposed T-shaped beam.
A further improvement of the present invention is that the PC structural columns and PC laminated T-beams form a fabricated frame structure.
A construction method for assembling a construction plate lower superposed T-beam unbonded prestressed node structure comprises the following specific steps:
a. hoisting and constructing the PC structural column on site;
b. c, carrying out site hoisting construction on the PC superposed T-shaped beam;
c. grouting connection of a steel bar sleeve at a post-cast section of a beam-column joint and erection of a template support;
d. c, stretching and anchoring the unbonded prestressed tendons at the end of the laminated T-shaped beam plate;
e. hoisting the prefabricated composite slab on site, wherein the overhanging steel bars at the upper part of the superposed T beam of the prefabricated composite slab are fixedly connected with the span beam of the truss ribs of the adjacent composite slab;
f. binding longitudinal steel bars on the upper part of the laminated slab, and integrally constructing a post-cast concrete surface layer;
g. and (4) removing the template and the integral bracket at the post-pouring section, and carrying out the hoisting construction of the previous layer.
The invention has the further improvement that in the step a, the elevation of the top of the PC structure column is effectively controlled, the error is controlled to be within-3 mm to +1mm, the connection of the PC structure column and the external extending steel bars at the upper part of the subsequent superposed T beam needs to be checked repeatedly before the PC structure column is hoisted in place, the protection work of the external extending steel bars at the upper part of the PC structure column is well done, the number of the external extending steel bars of the PC structure column is consistent with that of the external extending steel bars at the upper part of the designed superposed T beam, the number of the binding steel bars at the upper part of the PC superposed T beam is included, the complete butt joint is guaranteed at the post-cast section of the beam column one by one, the external extending steel bars at the upper part of the PC structure column and the subsequent superposed T beam are designed to be staggered, the connection of the subsequent steel bar sleeves.
The invention has the further improvement that in the step b, after the grouting strength of the column sleeve at the bottom of the PC structural column reaches more than the designed strength, the installation of the PC superposed T-beam bracket and the hoisting and positioning of the PC superposed T-beam can be carried out, and before the hoisting and positioning of the PC superposed T-beam are not finished, the four-position oblique adjustable support of the PC structural column cannot be dismantled in advance;
in the early stage of manufacturing the PC superposed T beam in a factory, a PC superposed T beam wing plate, unbonded prestressed reinforcement and the PC superposed T beam are integrally manufactured;
during the hoisting and positioning process of the PC superposed T beam, the height of the bottom of the PC superposed T beam is accurately adjusted through the beam body support frame, the height error of the bottom of the beam is controlled within 2mm, and the external extending steel bars at the post-cast section of the beam column node are connected in a staggered mode and connected through internal thread steel bar sleeve grouting.
The invention is further improved in that in the step d, after the grouting strength of the overhanging steel bar sleeve at the post-cast section of the beam column node reaches the design strength, the stretching and anchoring work of the overhanging unbonded prestressed steel bar at the end of the laminated PC laminated T beam wing plate can be carried out, the prestressed steel bar is stretched symmetrically by adopting a 1.03-time superstretching method, the anchoring is carried out immediately after the symmetrical stretching, the anchor sealing is not needed after the anchoring, and the post-cast section concrete pouring and the unbonded prestressed steel bar anchor sealing are combined into a whole after the post-cast section concrete pouring and the unbonded prestressed steel bar anchor sealing are carried out after the post-cast section concrete pouring at the post-cast section of the beam column node is carried.
The invention is further improved in that the overhanging steel bars at the upper part of the superposed T-shaped beam and the truss ribs of the superposed slab are connected one by adopting a welding method.
The invention has the further improvement that in the step f, after the composite slab is hoisted, the binding work of the longitudinal steel bars on the upper part of the composite slab is immediately carried out, and the acceptance of the integral hidden project before the post-cast concrete pouring is organized;
and after all the work is finished, the whole surface layer post-cast concrete pouring work can be carried out, and the post-cast section at the joint of the PC beam slab column and the whole surface layer concrete are integrally and once poured.
Compared with the prior art, the unbonded prestressed joint structure for the superposed T-beam under the assembled building plate and the construction method thereof at least realize the following beneficial effects:
the prefabricated building hoisting device adopts prefabricated building hoisting, is convenient to construct, low in cost, high in hoisting speed and precision and strong in overall structure shock resistance.
Of course, it is not specifically necessary for any one product that implements the invention to achieve all of the above-described technical effects simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic structural view of the present invention;
wherein, 1-PC structure column; 2-PC overlapping the T beam; 3-PC overlapping the T beam wing plate; 4-unbonded prestressed reinforcement; 5-overlapping the overhanging steel bars at the upper part of the T-shaped beam; 6-a laminated slab; 7-laminated slab truss ribs; 8-integral post-cast concrete surface layer.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
Example 1
As shown in fig. 1, the unbonded prestressed node structure of the superposed T-beam under the assembled building plate comprises a PC structural column 1, a PC superposed T-beam 2, unbonded prestressed reinforcement 4, an overhanging reinforcement 5 at the upper part of the superposed T-beam, a laminated slab 6, a laminated slab truss reinforcement 7 and an integral post-cast concrete surface layer 8;
A PC superposed T beam 2 is arranged above the PC structural column 1;
an unbonded prestressed steel bar 4 is arranged in the PC superposed T beam 2, an overhanging steel bar 5 is arranged at the upper part of the PC superposed T beam 2, and a laminated slab 6 is arranged above the PC superposed T beam 2;
a laminated plate truss rib 7 is arranged above the laminated plate 6, and the overhanging steel bar 5 is fixedly connected with the laminated plate truss rib 7;
an integral post-cast concrete surface layer 8 is arranged above the superimposed plate truss ribs 7.
For further explanation of the present embodiment, it should be noted that the PC superposed T-beam flanges 3 are disposed at two ends of the upper part of the PC superposed T-beam 2, and the PC superposed T-beam 2 and the PC superposed T-beam flanges 3 are an integrated structure; the unbonded prestressed reinforcement 4 is arranged in the PC superposed T-beam wing plate 3.
To further explain the present embodiment, it should be noted that the laminated plate truss ribs 7 of two adjacent laminated plates 6 are welded at the middle laminated T-beam 2.
To further explain the present embodiment, it should be noted that the PC structural columns 1 and the PC laminated T-beams 2 form a fabricated frame structure.
Based on the embodiment, the construction of the unbonded prestressed node of the superposed T-beam under the assembled building plate effectively realizes the implementation of a new construction and a new technology of the prestressed construction of the beam column node of the assembled concrete structure.
Example 2
As shown in fig. 1, a construction method for assembling a construction plate lower superposed T-beam unbonded prestressed node structure includes the following specific steps:
a. hoisting and constructing the PC structural column 1 on site;
b. c, carrying out site hoisting construction on the T-shaped superposed beam 2;
c. grouting connection of a steel bar sleeve at a post-cast section of a beam-column joint and erection of a template support;
d. c, stretching and anchoring the unbonded prestressed tendons at the end of the plate of the T-shaped superposed beam 2 by PC;
e. hoisting the prefabricated composite slab 6 on site, and fixedly connecting the overhanging steel bar 5 at the upper part of the superposed T beam of the prefabricated composite slab 6 with the span beam of the truss rib 7 of the adjacent composite slab;
f. binding longitudinal steel bars at the upper part of the laminated slab 6, and integrally constructing a post-cast concrete surface layer;
g. and (4) removing the template and the integral bracket at the post-pouring section, and carrying out the hoisting construction of the previous layer.
To explain the embodiment further, it should be noted that, in order to better complete the hoisting of the superposed T-beam in the subsequent process, the site hoisting, positioning and fixing work of the existing PC structural column is firstly completed, in step a, the elevation of the column top of the PC structural column 1 is effectively controlled, the error is controlled to be-3 mm to +1mm, before the PC structural column 1 is hoisted to position, the connection between the PC structural column 1 and the external steel bar 5 on the upper part of the subsequent superposed T-beam is repeatedly checked, the protection work of the transverse external steel bar above the PC structural column 1 is well done, the number of the external steel bar of the PC structural column 1 is consistent with the number of the external steel bar 5 on the upper part of the designed superposed T-beam, including the number of the steel bar after binding the upper part of the PC superposed T-beam 2, the complete butt joint of the external steel bar at the rear section of the beam is guaranteed, the PC structural column 1 and the external steel bar 5 on the upper part of the subsequent superposed T-beam are designed, the mutual offset length is not less than 200 mm. And after the indexes are tested again, positioning and fixing the PC structural column and grouting the sleeve.
To explain the embodiment further, it should be noted that, in the step b, after the grouting strength of the column sleeve at the bottom of the PC structural column 1 reaches more than 90% of the design strength, the installation of the PC superposed T-beam 2 support and the hoisting and positioning of the PC superposed T-beam 2 may be performed, and before the hoisting and positioning of the PC superposed T-beam 2 are not completed, the diagonal adjustable support in four positions of the PC structural column 1 must not be removed in advance. On the other hand, in the early stage of the manufacturing process of the PC superposed T beam 2 in a factory, the PC superposed T beam wing plate 3, the unbonded prestressed reinforcement 4 and the PC superposed T beam 2 are integrally manufactured, so that the accuracy of the position of the unbonded prestressed reinforcement at the designed T beam wing plate of the beam body after the finished product of the PC superposed T beam is ensured, and the unbonded prestressed reinforcement extending out of two ends is protected before the PC superposed T beam is lifted. In the hoisting and positioning process of the PC superposed T beam 2, the accurate adjustment of the elevation of the bottom of the PC superposed T beam 2 is carried out through the beam body support frame, the error of the elevation of the bottom of the beam is controlled within 2mm, and the external extending steel bars at the post-cast section of the beam column node are connected in a staggered mode and connected through internal thread steel bar sleeve grouting.
For further explanation of the present embodiment, it should be noted that, for grouting connection of the steel sleeves at the post-cast sections of the beam-column joints and erection of the formwork support, after field hoisting of the PC structural column and the superposed T-beam is completed, grouting connection of the steel sleeves extending out of the beam-column joints staggered at the post-cast sections of the beam-column joints can be performed, then, the formwork support at the post-cast sections of the beam-column joints can also be installed, and after all operations are completed, cleaning operation of the interior of the post-cast section formwork is performed.
In order to further explain the embodiment, it should be noted that in the step d, after the grouting strength of the overhanging steel bar sleeve at the post-cast section of the beam-column node reaches the design strength, the stretching and anchoring work of the overhanging unbonded prestressed steel bar at the end of the laminated T-beam wing plate 3 can be performed, the prestressed steel bar stretching adopts symmetrical stretching, and because the stretching position of the prestressed steel bar is effectively fixed at the end of the PC laminated T-beam wing plate during the design, on one hand, the easy operability of the stretching work is effectively achieved, and on the other hand, the design of the laminated T-beam wing plate is beneficial to the negative bending moment resistance of the beam-column node. The prestressed tendon tensioning adopts a 1.03-time supertensioning method, the prestressed tendon is symmetrically tensioned and then immediately anchored, the anchor sealing is not needed after the anchoring, and the post-cast section concrete pouring of the later-stage beam column node is realized, so that the post-cast section concrete pouring and the unbonded prestressed tendon anchor sealing are combined into a whole.
In order to further explain the embodiment, it should be noted that after the tensioning and anchoring work of the prestressed tendons at the end of the laminated T-beam wing plate is completed, the prefabricated laminated slab is hoisted, and in order to improve the structural performance of the integral frame of the assembly structure and improve the shock resistance of the integral structure, the truss tendons are reliably connected one by one at the position of the span of the truss tendons of the adjacent laminated slab by adopting a welding method.
In order to further explain the embodiment, it should be noted that, in the step f, after the composite slab 6 is hoisted, the binding work of the longitudinal steel bars on the upper part of the composite slab 6 is immediately performed, and the acceptance of the whole concealed project before the concrete pouring after the organization is performed is accepted;
and after all the work is finished, the whole surface layer post-cast concrete pouring work can be carried out, and the post-cast section at the joint of the PC beam slab column and the whole surface layer concrete are integrally and once poured.
According to the embodiment, the unbonded prestressed node structure and the construction method for the superposed T-beam under the assembled building plate, provided by the invention, at least realize the following beneficial effects:
the prefabricated building hoisting device adopts prefabricated building hoisting, is convenient to construct, low in cost, high in hoisting speed and precision and strong in overall structure shock resistance.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. An assembly building panel underlaps T roof beam prestressing without bondn node structure which characterized in that includes: the concrete post-cast composite beam comprises a PC structural column (1), a PC superposed T beam (2), unbonded prestressed steel bars (4), upper overhanging steel bars (5) of the superposed T beam, a laminated slab (6), laminated slab truss ribs (7) and an integral post-cast concrete surface layer (8);
a PC superposed T beam (2) is arranged above the PC structural column (1);
unbonded prestressed steel bars (4) are arranged in the PC superposed T beam (2), an overhanging steel bar (5) is arranged at the upper part of the PC superposed T beam (2), and a laminated plate (6) is arranged above the PC superposed T beam (2);
a laminated plate truss rib (7) is arranged above the laminated plate (6), and the overhanging steel bar (5) is fixedly connected with the laminated plate truss rib (7);
and an integral post-cast concrete surface layer (8) is arranged above the superposed plate truss rib (7).
2. The unbonded prestressed node structure of the assembled building plate lower superposed T-beam as claimed in claim 1, wherein PC superposed T-beam wing plates (3) are arranged at two ends of the upper part of the PC superposed T-beam (2), and the PC superposed T-beam (2) and the PC superposed T-beam wing plates (3) are of an integrally formed structure; the unbonded prestressed reinforcement (4) is arranged in the PC superposed T-beam wing plate (3).
3. The unbonded prestressed node structure of assembled building panel underlapping T-beam of claim 1,
and the laminated slab truss ribs (7) of the two adjacent laminated slabs (6) are connected at the middle part of the T-shaped superposed beam (2) by welding.
4. The unbonded prestressed node structure of assembled building panel underlapping T-beam of claim 1,
the PC structure column (1) and the PC superposed T-shaped beam (2) form an assembled frame structure.
5. The construction method for assembling the unbonded prestressed joint structure of the superposed T-beam under the building panel as claimed in claim 1, is characterized by comprising the following concrete steps:
a. hoisting and constructing the PC structural column (1) on site;
b. c, carrying out on-site hoisting construction on the T-shaped superposed beam (2);
c. grouting connection of a steel bar sleeve at a post-cast section of a beam-column joint and erection of a template support;
d. the plate end of the PC superposed T beam (2) is tensioned and anchored by unbonded prestressed tendons;
e. hoisting the prefabricated composite slab (6) on site, and fixedly connecting the overhanging steel bar (5) at the upper part of the superposed T beam of the prefabricated composite slab (6) with the span beam of the truss rib (7) of the adjacent composite slab;
f. binding longitudinal steel bars at the upper part of the laminated slab (6), and integrally constructing a post-cast concrete surface layer;
g. And (4) removing the template and the integral bracket at the post-pouring section, and carrying out the hoisting construction of the previous layer.
6. The construction method of the unbonded prestressed joint structure of the superposed T-beam under the assembled building plate according to claim 5, characterized in that in the step a, the elevation of the top of the PC structural column (1) is effectively controlled, the error is controlled to be within-3 mm to +1mm, before the PC structural column (1) is hoisted in place, the connection of the PC structural column (1) and the externally extending reinforcing steel bars (5) at the upper part of the subsequent superposed T-beam is repeatedly checked, the protection work of the transversely externally extending reinforcing steel bars above the PC structural column (1) is well done, the number of the externally extending reinforcing steel bars of the PC structural column (1) is consistent with the number of the externally extending reinforcing steel bars (5) at the upper part of the designed superposed T-beam, the number of the externally extending reinforcing steel bars at the upper part of the PC superposed T-beam (2) is included, the complete butt joint of the upper part of the beam column is ensured one by one, the PC structural column (1) and the externally extending reinforcing steel bars (, the subsequent steel bar sleeves are ensured to be connected one by one, namely, the connection nodes are mutually staggered, and the mutual staggered length is not less than 200 mm.
7. The construction method of the unbonded prestressed joint structure of the superposed T-beam under the assembled building plate is characterized in that in the step b, after the grouting strength of the column sleeve at the bottom of the PC structural column (1) reaches more than 90% of the designed strength, the installation of the support of the PC superposed T-beam (2) and the hoisting and in-place of the PC superposed T-beam (2) can be carried out, and before the hoisting and in-place of the PC superposed T-beam (2) are not completed, the four-position oblique adjustable support of the PC structural column (1) cannot be dismantled in advance;
In the early stage of manufacturing the PC superposed T beam (2) in a factory, a PC superposed T beam wing plate (3), an unbonded prestressed reinforcement (4) and the PC superposed T beam (2) are integrally manufactured;
during the hoisting and positioning process of the PC superposed T beam (2), the accurate adjustment of the elevation of the bottom of the PC superposed T beam (2) is carried out through the beam body support frame, the error of the elevation of the bottom of the beam is controlled within 2mm, and the extending reinforcing steel bars at the post-cast section of the beam-column joint are connected in a staggered mode and connected through internal thread reinforcing steel bar sleeve grouting.
8. The construction method for assembling the construction panel under-lay T-beam unbonded prestressed joint structure of claim 7,
and d, after the grouting strength of the overhanging steel bar sleeve at the post-cast section of the beam-column joint reaches the design strength, tensioning and anchoring the overhanging unbonded prestressed steel bar at the end of the laminated PC superposed T beam wing plate (3) can be carried out, the prestressed steel bar is tensioned symmetrically, the prestressed steel bar is tensioned by adopting a 1.03-time supertensioning method, the symmetrical tensioning is immediately anchored, the anchor sealing is not needed after the anchoring, and the post-cast section concrete pouring of the post-cast section of the beam-column joint is carried out later, so that the post-cast section concrete pouring and the unbonded prestressed steel bar sealing and anchoring are combined.
9. The construction method for assembling the unbonded prestressed joint structure of the laminated T-beam under the building panel as claimed in claim 5, wherein the external extending steel bars (5) at the upper part of the laminated T-beam and the truss ribs (7) of the laminated slab are connected one by welding.
10. The construction method for assembling the unbonded prestressed joint structure of the laminated T-beam under the building plate as claimed in claim 5, wherein in the step f, after the laminated slab (6) is hoisted, the binding work of the longitudinal steel bars on the upper part of the laminated slab (6) is immediately carried out, and the overall hidden project acceptance before the concrete pouring is organized;
and after all the work is finished, the whole surface layer post-cast concrete pouring work can be carried out, and the post-cast section at the joint of the PC beam slab column and the whole surface layer concrete are integrally and once poured.
CN202010433663.8A 2020-05-21 2020-05-21 Unbonded prestressed node structure for superposed T-beam under assembled building plate and construction method Pending CN111851831A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112482568A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of connection joint of crossed primary and secondary beams with bonding prestress
CN112482569A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of three-direction unbonded prestressed crossed beam-column joint
CN112482567A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of four-direction unbonded prestressed crossed beam-column joint

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Publication number Priority date Publication date Assignee Title
CN112482568A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of connection joint of crossed primary and secondary beams with bonding prestress
CN112482569A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of three-direction unbonded prestressed crossed beam-column joint
CN112482567A (en) * 2020-11-20 2021-03-12 南通四建集团有限公司 Construction method and structure of four-direction unbonded prestressed crossed beam-column joint

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