CN111608312A - Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method - Google Patents
Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method Download PDFInfo
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- CN111608312A CN111608312A CN202010433662.3A CN202010433662A CN111608312A CN 111608312 A CN111608312 A CN 111608312A CN 202010433662 A CN202010433662 A CN 202010433662A CN 111608312 A CN111608312 A CN 111608312A
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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
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- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
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- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a tensioning node of a T-shaped beam wing plate under a post-tensioning method with a bonded 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 the beam plate steel bars and laying the prestressed tendons through pipes; 4) carrying out pipe penetrating treatment on prestressed tendons at the end of a wing plate of the T-shaped beam below the plate; 5) integrally pouring and maintaining the beam slab column concrete; 6) tensioning and anchoring prestressed tendons at the end heads of the T-shaped beam wing plates under the plates; 7) grouting a pore passage and sealing an anchor at 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 method with a bonded 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. Particularly, the construction quality of the core area of the complex bonded prestressed beam-column joint is difficult to 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 joint at the joint of the bonded prestressed beam-column and how to enhance the seismic capacity strength of the joint of the bonded 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 method with a bonded prestressed rib plate and a construction method.
The technical scheme is as follows: the invention relates to a post-tensioning method T-beam wing plate tensioning node structure with a bonding 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 a bonding 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; the prestressed ducts and the internal prestressed reinforcements are arranged inside two ends of the local cast-in-place T beam, and the bonded prestressed reinforcements form a prestressed reinforcement tensioning end node for the cast-in-place T beam in 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 bonded 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 method with a bonded prestressed rib plate and a construction method thereof comprise the following specific steps:
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 beam plate steel bars of the local cast-in-place T beam and laying prestressed tendons through pipes;
4) carrying out local cast-in-place T beam end prestressed tendon pipe penetration treatment;
5) integrally pouring and maintaining concrete of the cast-in-place concrete column;
6) tensioning and anchoring the cast-in-situ T-beam end prestressed tendon;
7) grouting a pore passage and sealing an anchor at 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 prestressed tendons at the end of the T beam wing plate of the local cast-in-place T beam are processed;
and 6), tensioning and anchoring the prestressed tendons at the ends 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), adopting micro-expansion waterproof mortar or fine aggregate concrete for anchor sealing work.
Compared with the prior art, the tensioning node of the T-shaped beam wing plate under the post-tensioning method with the bonded prestressed rib plate and the construction method provided by the invention at least realize the following beneficial effects:
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.
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-prestressed duct and prestressed tendon.
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,
a post-tensioning method has T roof beam pterygoid lamina stretch-draw node construction under the prestressing force gusset of bonding, including cast-in-place floor 1, local cast-in-place T roof beam 2, cast-in-place concrete column 3, have the prestressing reinforcement 5 of bonding; 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 prestressed ducts and the internal prestressed reinforcements 5 are arranged inside two ends of the local cast-in-place T beam 2, and the bonded prestressed reinforcements 5 form a prestressed reinforcement tensioning end node for the cast-in-place T beam 2 in 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 bonded 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,
a T-beam wing plate tensioning node under a post-tensioning method with a bonded 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) And binding the beam plate steel bars of the local cast-in-place T beam 2 and laying the prestressed tendons through pipes. The integral installation of the floor slab and the T-beam formwork support is finished, beam slab steel bar binding, prestressed pipe laying and prestressed pipe penetrating work can be carried out, particularly, in the process of binding the T-beam wing slab steel bars, the prestressed pipe laying and installation are well carried out, stirrup steel bars are adopted for fixing the prestressed pipe laying and installation, the stirrup steel bars are firmly bound or welded with the steel bars in the T-beam wing slab, and the fixation of the prestressed pipe position in the subsequent concrete pouring process is ensured. In addition, the prestressed pipeline laying and the prestressed tendon pipe penetrating work in a preformed hole of a side formwork which is required to extend out of the end of the T-shaped beam wing plate.
4) And (3) carrying out pipe penetrating treatment on the prestressed tendons at the end of the local cast-in-place T beam 2. In order to realize the local concrete security of later stage prestressing tendons stretch-draw, the prestressing force pipeline is laid and prestressing tendons poling work will carry out intensive treatment in T roof beam aerofoil end, design pre-buried coaxial double helix muscle steel square groove device, pre-buried coaxial double helix muscle steel square groove device adopts stirrup reinforcing bar fixed equally, coaxial double helix muscle is buried inside stretch-draw end concrete, the steel square groove of tip adopts welded connection with coaxial double helix muscle, steel square groove top T roof beam aerofoil end template inboard side, adopt the foam block to fill the closure in the square groove.
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 prestressed tendons at the end of the cast-in-place T beam 2. When the concrete is maintained to the designed strength, the prestressed tendons at the end heads of the T-shaped beam wing plates under the plates can be tensioned and anchored, the prestressed tendons are tensioned 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 tensioning 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.
7) Grouting the pore channel and sealing the anchoring end of the prestressed tendon. And tensioning and anchoring the prestressed tendons at the end heads of the T-shaped beam wing plates under the plate, and performing hole grouting and prestressed tendon anchoring end sealing and anchoring treatment. For the prestressed tendon anchoring end sealing treatment work, the anchorage is anchored in the coaxial double-spiral tendon steel square groove after the prestressed tendon is tensioned, so that the concealment and the attractiveness of the prestressed tendon end anchorage after the anchorage is sealed are achieved, and the sealing work adopts micro-expansion waterproof mortar or fine aggregate concrete with strength higher than that of the original concrete by two levels.
8) And (5) removing the template bracket.
For further explanation of the embodiment, it should be noted that, in step 4), the tendons at the ends of the T-beam wing plates 4 of the locally cast-in-place T-beam 2 are processed;
and 6), tensioning and anchoring the 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.
For further explanation of the embodiment, it should be noted that, in the step 4), the coaxial double-spiral-bar square groove devices are pre-embedded, the pre-embedded coaxial double-spiral-bar square groove devices are also fixed by stirrup steel bars, the coaxial double-spiral bars are embedded in the concrete at the tensioning end, the steel square grooves at the end portions are connected with the coaxial double-spiral bars in a welding manner, and the steel square grooves are abutted to the inner side edge of the template at the end of the T-beam wing plate. For the prestressed tendon anchoring end sealing treatment work, the anchorage is anchored in the coaxial double-spiral tendon steel square groove after the prestressed tendon is tensioned, so that the concealment and the attractiveness of the prestressed tendon end anchorage after the anchorage is sealed are achieved, and the sealing work adopts micro-expansion waterproof mortar or fine aggregate concrete with strength higher than that of the original concrete by two levels.
According to the embodiment, the tensioning node of the T-shaped beam wing plate under the post-tensioning method with the bonded prestressed rib plate and the construction method provided by the invention at least realize the following beneficial effects:
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.
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 post-tensioning method T-beam wing plate tensioning node structure with a bonding prestressed rib plate is characterized by comprising a cast-in-place floor slab (1), a local cast-in-place T beam (2), a cast-in-place concrete column (3) and a bonding prestressed reinforcement (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 prestressed concrete beam is characterized in that prestressed ducts and internal prestressed reinforcements (5) are arranged inside two ends of the local cast-in-place T beam (2), and the bonded prestressed reinforcements (5) form a prestressed reinforcement tensioning end node for the cast-in-place T beam (2) in later construction.
2. The post-tensioning T-beam wing plate tensioning joint structure with the bonded prestressed rib plates according to claim 1, characterized in that the local 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 local cast-in-place T beam (2) and the cast-in-place concrete column (3) form a reinforced beam column joint of the lower T-beam wing plate.
3. The tensioning node structure of the T-shaped beam wing plate under the post-tensioning method with the bonded prestressed rib plate according to claim 2, characterized in that the bonded prestressed ribs (5) are arranged inside two ends of the T-shaped beam wing plate (4).
4. The tensioning node of the T-shaped beam wing plate under the post-tensioning method with the bonded 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 beam plate steel bars of the local cast-in-place T beam (2) and laying prestressed tendons through pipes;
4) carrying out pipe penetrating treatment on the prestressed tendons at the end of the local cast-in-place T beam (2);
5) the cast-in-place concrete column (3) is integrally cast and maintained;
6) tensioning and anchoring the prestressed tendons at the end of the cast-in-situ T beam (2);
7) grouting a pore passage and sealing an anchor at 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 method with the bonded prestressed rib plate and the construction method according to claim 4 are characterized in that,
step 4), processing prestressed tendons at the end of a T beam wing plate (4) of the local cast-in-place T beam (2);
and 6), tensioning and anchoring the prestressed tendons at the ends of the T-beam wing plates (4).
6. The tensioning joint for the T-shaped beam wing plate under the post-tensioning method with the bonded prestressed rib plate and the construction method according to the claims 4 or 5 are characterized in that in the step 6), cross symmetrical tensioning prestressed ribs are adopted.
7. The tensioning joint of the T-shaped beam wing plate under the post-tensioning method with the bonded prestressed rib plate and the construction method according to the claims 4 or 5 are characterized in that,
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), adopting micro-expansion waterproof mortar or fine aggregate concrete for anchor sealing work.
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| CN202010433662.3A CN111608312A (en) | 2020-05-21 | 2020-05-21 | Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method |
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| CN202010433662.3A CN111608312A (en) | 2020-05-21 | 2020-05-21 | Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method |
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| 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 |
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| 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 |
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Application publication date: 20200901 |