CN111608313A - Tensioning node of T-beam wing plate under post-tensioning unbonded prestressed rib plate and construction method - Google Patents
Tensioning node of T-beam wing plate under post-tensioning unbonded prestressed rib plate and construction method Download PDFInfo
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- CN111608313A CN111608313A CN202010433668.0A CN202010433668A CN111608313A CN 111608313 A CN111608313 A CN 111608313A CN 202010433668 A CN202010433668 A CN 202010433668A CN 111608313 A CN111608313 A CN 111608313A
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- tensioning
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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
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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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
-
- 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
Abstract
The invention discloses a tensioning node of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate and a construction method, wherein the construction process flow comprises the following steps: 1) binding the cast-in-place concrete column reinforcing steel bars and installing and constructing a template; 2) the floor slab and the T-beam formwork support are integrally installed; 3) binding beam plate steel bars and laying unbonded prestressed tendons; 4) treating unbonded prestressed ribs at the end heads of the T-shaped beam wing plates under the plates; 5) integrally pouring and maintaining the beam slab column concrete; 6) tensioning and anchoring the unbonded prestressed tendons at the end heads of the T-shaped beam wing plates below the plate; 7) sealing the anchoring end of the prestressed tendon; 8) and (5) removing the template bracket. The invention adopts the under-slab T-beam wing plate end prestress tensioning technology at the node of the cast-in-place concrete beam column, effectively improves the stress characteristic of the beam column node, has good negative bending moment resistance effect of the node, and has strong earthquake resistance of the prestress beam column reinforced node.
Description
Technical Field
The invention relates to a prestressed structure connecting node structure and a construction method, in particular to a tensioning node of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate and a construction method.
Background
With the continuous development of the building industry in China, the expectation of commercial complex projects with larger quantities to the latter is also continuously improved, that is, on the premise of meeting the 'bearing capacity limit state', a user has deeper understanding and requirements on the 'normal use limit state' of the building. However, the joint joints (beam-column joints, and column-column joints) have complex construction processes and high construction difficulty, and become structural weak positions which may be damaged, and the joint surface becomes a weak surface with reduced section bearing capacity. Especially, the construction quality of the complex unbonded prestressed beam-column joint core area is difficult to obtain due guarantee. The beam column core area of the complex node often has the construction problems that reinforcing steel bars are dense and are arranged in an intricate manner, the anchoring length of the reinforcing steel bars is difficult to meet, the welding quality of the reinforcing steel bars with the rib plates is difficult to control, the welding operation surface of the reinforcing steel bars at the bottom of the beam is insufficient, the aperture ratio of a section steel member is difficult to control, and the plate surface is ultrahigh due to the overlapping and arrangement of the reinforcing steel bars. Therefore, how to improve the negative bending moment resistance effect of the node at the node of the unbonded prestressed beam column and how to enhance the seismic capacity strength of the node of the unbonded prestressed beam column are the problems to be solved by the patent.
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 tensioning node of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate, which is strong in shock resistance and good in negative bending moment resistance effect of the node, and a construction method.
The technical scheme is as follows:
the invention relates to a tensioning node structure of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate, which comprises a cast-in-place floor slab, a local cast-in-place T beam, a cast-in-place concrete column and unbonded prestressed reinforcement; the local cast-in-place T beam is arranged at the lower part of the cast-in-place floor slab; the local cast-in-place T beam is connected with the cast-in-place concrete column; and unbonded prestressed tendons are arranged inside two ends of the local cast-in-place T beam and form a tensioning end node of the prestressed tendons of the local cast-in-place T beam for later construction.
The invention has the further improvement that the local cast-in-place T beam comprises a top T beam wing plate and a bottom main beam, and the main beam at the bottom of the local cast-in-place T beam and the cast-in-place concrete column form a bottom T beam wing plate reinforced beam column node.
The invention is further improved in that the unbonded prestressed tendons are arranged inside two ends of the T-shaped beam wing plate.
A T-beam wing plate tensioning node under a post-tensioning unbonded prestressed rib plate and a construction method structure are disclosed, and the concrete steps are as follows:
1) binding the cast-in-place concrete column reinforcing steel bars and installing and constructing a template;
2) integrally installing a cast-in-place floor slab and a local cast-in-place T beam bracket;
3) binding steel bars of the local cast-in-place T beam and laying unbonded prestressed tendons;
4) processing local cast-in-place T beam end unbonded prestressed tendons;
5) integrally pouring and maintaining concrete of the cast-in-place concrete column;
6) tensioning and anchoring the unbonded prestressed tendons at the end of the cast-in-place T beam;
7) sealing the anchoring end of the prestressed tendon;
8) and (5) removing the template bracket.
The further improvement of the invention is that, in step 4), the end head of the T-shaped beam wing plate is processed by the unbonded prestressed tendons; and 6), tensioning and anchoring the unbonded prestressed tendons at the end heads of the T-beam wing plates.
The invention has the further improvement that in the step 6), the prestressed tendons are stretched in a crossed and symmetrical mode.
The invention has the further improvement that in the step 4), a coaxial double-spiral-bar square groove device is pre-embedded, the pre-embedded coaxial double-spiral-bar square groove device is fixed by stirrup steel bars, the coaxial double-spiral bars are embedded in concrete at a tensioning end, the steel square grooves at the end parts are connected with the coaxial double-spiral bars in a welding manner, and the steel square grooves are propped against the inner side edge of a template at the end of a T-shaped beam wing plate; and 7), filling and sealing the square groove by adopting a foam block.
Compared with the prior art, the tensioning node of the T-shaped beam wing plate under the post-tensioning unbonded prestressed rib plate and the construction method provided by the invention at least realize the following beneficial effects:
according to the invention, the prestress tensioning technology of the T-shaped beam wing plate end under the cast-in-place floor slab 1 is adopted at the cast-in-place concrete beam column node, so that the stress characteristic of the beam column node is effectively improved, the hogging moment resistance effect of the node is good, and the earthquake resistance of the prestressed beam column reinforced node is strong.
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.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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, a floor slab is cast in situ; 2-local cast-in-place of the T beam; 3-casting a concrete column in situ; 4-T beam wing panel; 5-unbonded prestressed tendons.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the case of the example 1, the following examples are given,
as shown in figure 1, the tensioning node structure of the T-beam wing plate under the post-tensioning unbonded prestressed rib plate comprises a cast-in-place floor slab 1, a local cast-in-place T beam 2, a cast-in-place concrete column 3 and unbonded prestressed reinforcement bars 5; the local cast-in-place T beam 2 is arranged at the lower part of the cast-in-place floor slab 1; the local cast-in-place T beam 2 is connected with a cast-in-place concrete column 3; the unbonded prestressed tendons 5 are arranged inside two ends of the local cast-in-place T beam 2, and the unbonded prestressed tendons 5 form a tensioning end node of the prestressed tendons of the local cast-in-place T beam 2 for later construction.
According to the embodiment, the implementation of a new construction and a new technology of the prestressed construction of the beam-column joint of the cast-in-place reinforced concrete structure is effectively realized.
To further explain the present embodiment, it should be noted that the locally cast-in-place T-beam 2 includes a top T-beam wing 4 and a bottom main beam, and the bottom main beam of the locally cast-in-place T-beam 2 and the cast-in-place concrete column 3 form an underfloor T-beam wing reinforced beam column node. In order to facilitate tensioning and anchoring of the follow-up prestressed tendons and consider the negative bending moment at the node of the beam column, the construction length of the local cast-in-place T beam 2 is 1/4-1/3 of the beam span.
To further explain the present embodiment, it should be noted that the unbonded prestressed tendons 5 are provided inside both ends of the T-beam panel 4.
In the case of the example 2, the following examples are given,
as shown in figure 1, a tensioning node of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate and a construction method thereof comprise the following specific steps:
1) and (5) binding the steel bars of the cast-in-place concrete column 3 and installing and constructing a template. In order to better complete the installation of the subsequent T-beam wing plates, firstly, the installation of a cast-in-place concrete column template is completed, when the cast-in-place concrete column is installed on site, the installation size of the T-beam wing plates under the subsequent plate is considered at the column top, namely the thickness of the T-beam wing plates is decreased downwards at the joint of the column and the beam, and the effective butt joint of the installation of the local T-beam wing plate templates protruding downwards under the subsequent plate is realized. The cast-in-place concrete column template adopts an aluminum alloy template or a wood template. After the cast-in-place concrete column template is installed, the support work of the column template is completed, the consistency of the elevation of the top of the column template installation and the elevation of the bottom of the subsequent T-beam wing plate to be installed is checked, and the error is controlled within 2 mm.
2) And integrally installing a support of the cast-in-place floor slab 1 and the local cast-in-place T beam 2. After the cast-in-place concrete column formwork is installed, the floor and the T beam formwork support can be installed, firstly, the T beam formwork and the support are installed, and after the column top elevation in which the bottom elevation position of the T beam wing plate is considered is checked, the T beam and the formwork of the T beam wing plate begin to be installed. When a wood template or an aluminum alloy template is adopted, later-stage prestressed tendon through holes are reserved on the side template at the end of the wing plate of the T-shaped beam, the hole diameter of the reserved prestressed tendon through holes is 1-2 mm larger than the size of the prestressed tendons, and particularly when the aluminum alloy template is adopted, the reserved prestressed tendon through holes in the aluminum alloy template are integrally machined and formed or specially customized during the processing of the aluminum alloy template. And after the T beam and the T beam wing plate template are installed, installing a floor slab template, and checking the integral installation position and elevation of the beam, the plate and the column.
3) Binding the steel bars of the local cast-in-place T beam 2 and laying the unbonded prestressed tendons 5. Floor and T roof beam formwork support integral erection finish, can carry out beam slab reinforcement and the work of laying of unbonded prestressing tendons, especially at ligature T roof beam pterygoid lamina reinforcing bar in-process, will lay the installation with unbonded prestressing tendons, unbonded prestressing tendons is laid the installation and is adopted stirrup reinforcing bar fixed, stirrup reinforcing bar and the reinforcement in the T roof beam pterygoid lamina or the bonding firm, guarantee the fixity at follow-up concrete placement in-process prestressing tendons position, in addition, work is laid at the preformed hole that the side template will stretch out in T roof beam pterygoid lamina end to unbonded prestressing tendons.
4) And (3) processing the unbonded prestressed tendons at the end of the local cast-in-place T beam 2.
5) And (3) integrally pouring and maintaining concrete of the cast-in-place concrete column. After all the work is finished, concrete pouring can be carried out, the beam slab column concrete is poured integrally at one time, the concrete pouring work at the joints of the beam column, particularly the concrete pouring work in the T beam wing plate, is reinforced, and the protection work of the prestressed rib position is well carried out in the pouring and vibrating process.
6) And tensioning and anchoring the unbonded prestressed tendons at the end of the cast-in-place T beam 2. And (4) after the concrete is cured to the designed strength, tensioning and anchoring the unbonded prestressed tendons at the end heads of the T-beam wing plates under the plates.
7) And (5) sealing the anchoring end of the prestressed tendon.
8) And (5) removing the template bracket.
For further explanation of the embodiment, it should be noted that, in step 4), the unbonded tendons are processed at the end of the T-beam wing plate 4; and 6), tensioning and anchoring the unbonded prestressed tendons at the end of the T-beam wing plate 4.
For further explanation of the present embodiment, it should be noted that, in step 6), the prestressed tendons are stretched symmetrically by crossing. The method comprises the following steps of stretching and anchoring unbonded prestressed tendons at the end heads of T-shaped beam wing plates under the plates, wherein the prestressed tendons are stretched in a cross symmetry mode, and the prestressed tendons are effectively fixed at the end of the T-shaped beam wing plates during design, so that on one hand, the operability of stretching is effectively achieved, and on the other hand, the design of the T-shaped beam wing plates is beneficial to the negative bending moment resistance of beam-column joints. Before the prestressed tendons are tensioned, foam blocks pre-embedded in a coaxial double-spiral tendon steel square groove are removed completely, the prestressed tendons are tensioned by a 1.03-time supertensioning method, and are anchored immediately after being tensioned in a crossed and symmetrical mode, and an anchorage device is anchored in the coaxial double-spiral tendon steel square groove.
For further explaining the embodiment, it should be noted that, in order to realize the local concrete safety of later stage prestressed tendon tensioning, unbonded prestressed tendon laying work is at the T-beam flange end, in step 4), coaxial double-helix tendon steel square groove device is pre-buried, pre-buried coaxial double-helix tendon steel square groove device adopts stirrup steel bar fixation equally, coaxial double-helix tendon is buried inside tensioning end concrete, the steel square groove of tip adopts welded connection with coaxial double-helix tendon, the steel square groove top is at the inside edge of T-beam flange end template. And 7) for the anchor sealing treatment work of the anchoring end of the prestressed tendon, because the anchor is anchored in the coaxial double-spiral tendon steel square groove after the prestressed tendon is tensioned, the concealment and the attractiveness of the anchor at the end of the prestressed tendon after being sealed are realized, and the anchor sealing work adopts micro-expansion waterproof mortar or fine aggregate concrete with strength higher than that of the original concrete by two levels. The square groove is filled and sealed by a foam block.
According to the embodiment, the tensioning node of the T-shaped beam wing plate under the post-tensioning unbonded prestressed rib plate and the construction method provided by the invention at least realize the following beneficial effects:
according to the invention, the prestress tensioning technology of the T-shaped beam wing plate end under the cast-in-place floor slab 1 is adopted at the cast-in-place concrete beam column node, so that the stress characteristic of the beam column node is effectively improved, the hogging moment resistance effect of the node is good, and the earthquake resistance of the prestressed beam column reinforced node is strong.
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 (7)
1. A tensioning node structure of a T-shaped beam wing plate under a post-tensioning unbonded prestressed rib plate is characterized by comprising a cast-in-place floor slab (1), a local cast-in-place T-shaped beam (2), a cast-in-place concrete column (3) and unbonded prestressed reinforcements (5);
the local cast-in-place T beam (2) is arranged at the lower part of the cast-in-place floor slab (1);
the local cast-in-place T beam (2) is connected with the cast-in-place concrete column (3);
the local cast-in-place T roof beam (2) both ends inside is equipped with unbonded prestressing tendons (5), unbonded prestressing tendons (5) constitute the prestressing tendons stretch-draw end node of later stage construction as local cast-in-place T roof beam (2).
2. The post-tensioning unbonded prestressed rib plate lower T-beam wing plate tensioning node structure according to claim 1, characterized in that the locally cast-in-place T-beam (2) comprises a top T-beam wing plate (4) and a bottom main beam, and the bottom main beam of the locally cast-in-place T-beam (2) and the cast-in-place concrete column (3) form a plate lower T-beam wing plate reinforced beam column node.
3. The tension node structure of the T-beam wing plate under the post-tensioning unbonded prestressed rib plate according to claim 2, characterized in that the unbonded prestressed ribs (5) are arranged inside two ends of the T-beam wing plate (4).
4. The tensioning node of the T-shaped beam wing plate under the post-tensioning unbonded prestressed rib plate and the construction method according to claim 1 are characterized by comprising the following specific steps:
1) binding reinforcing steel bars of a cast-in-place concrete column (3) and installing and constructing a template;
2) integrally installing a support of a cast-in-place floor slab (1) and a local cast-in-place T beam (2);
3) binding steel bars of the local cast-in-place T beam (2) and laying unbonded prestressed tendons (5);
4) the end of the local cast-in-place T beam (2) is processed by unbonded prestressed tendons;
5) the cast-in-place concrete column (3) is integrally cast and maintained;
6) tensioning and anchoring the unbonded prestressed tendons at the end of the cast-in-place T beam (2);
7) sealing the anchoring end of the prestressed tendon;
8) and (5) removing the template bracket.
5. The tensioning joint of the T-shaped beam wing plate under the post-tensioning unbonded prestressed rib plate and the construction method according to claim 4 are characterized in that,
step 4), processing unbonded prestressed tendons at the end of the T-beam wing plate (4);
and 6), tensioning and anchoring the unbonded prestressed tendons at the end of the T-beam wing plate (4).
6. The construction method for tensioning the end node structure by the lower plate of the post-tensioning unbonded prestressed rib plate according to claim 4 or 5, wherein in the step 6), the prestressed ribs are tensioned symmetrically in a crossed manner.
7. The tensioning joint of the T-shaped beam wing plate under the post-tensioning unbonded prestressed rib plate and the construction method according to the claims 4 or 5,
in the step 4), a coaxial double-spiral-rib square groove device is pre-embedded, the pre-embedded coaxial double-spiral-rib square groove device is fixed by stirrup steel bars, the coaxial double-spiral ribs are embedded in concrete at a tensioning end, steel square grooves at the end parts are connected with the coaxial double-spiral ribs in a welding mode, and the steel square grooves are propped against the inner side edge of a formwork at the end of a T-shaped beam wing plate;
and 7), filling and sealing the square groove by adopting a foam block.
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| CN202010433668.0A CN111608313A (en) | 2020-05-21 | 2020-05-21 | Tensioning node of T-beam wing plate under post-tensioning unbonded prestressed rib plate and construction method |
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| CN202010433668.0A CN111608313A (en) | 2020-05-21 | 2020-05-21 | Tensioning node of T-beam wing plate under post-tensioning unbonded prestressed rib plate and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| 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 |
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Application publication date: 20200901 |