CN114876190A - Method and device for intercepting high-strength concrete in beam - Google Patents
Method and device for intercepting high-strength concrete in beam Download PDFInfo
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- CN114876190A CN114876190A CN202210588005.5A CN202210588005A CN114876190A CN 114876190 A CN114876190 A CN 114876190A CN 202210588005 A CN202210588005 A CN 202210588005A CN 114876190 A CN114876190 A CN 114876190A
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
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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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
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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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/001—Corner fastening or connecting means for forming or stiffening elements
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- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a method and a device for intercepting high-strength concrete in a beam, wherein the method comprises the following steps: determining an interception position: the part which is half of the height of the column boundary beam and is not less than 500mm is used as the joint surface of high-strength and low-strength grade concrete; installing an intercepting device: selecting one beam stirrup as a positioning stirrup; after the stirrups are installed, a plurality of deformed steels are arranged between two beam main reinforcements which are adjacent in the transverse direction, the deformed steels are arranged at the positions of the reinforcement protection layers on the two sides of the beam respectively, the deformed steels are installed in an inclined mode, the deformed steels and the stirrups are installed at an angle of 45 degrees, and the upper portions of the deformed steels are fixed with the stirrups; reinforcing steel bars which are smaller than the beam main bars by one grade are arranged between two vertically adjacent beam main bars; installing a screw at the lower opening of the template: a screw is arranged at the bottom of the beam and traverses the beam template, and the lower part of the deformed steel bar is abutted against the screw; and (6) pouring concrete. The invention can avoid the disordered flowing of the high-strength concrete and improve the interception quality of the high-strength concrete.
Description
Technical Field
The invention relates to the field of building construction, in particular to a method and a device for intercepting high-strength concrete in a beam.
Background
With the rapid development of the building industry, in order to meet the design requirements of 'strong columns, weak beams and strong joints', concrete with different strength grades is designed in a structural beam column joint area, so that the requirement of structural seismic resistance is met. In order to improve the interception construction quality of high-strength concrete in a beam and ensure the structure construction quality of a beam column joint area and the attractiveness of the concrete, the existing construction method can cause the concrete in the joint area to flow and crack, and the quality and the impression effect of the concrete structure are influenced.
Disclosure of Invention
The invention aims to provide a method and a device for intercepting high-strength concrete in a beam, which can avoid disordered flowing of the high-strength concrete and improve the interception quality of the high-strength concrete.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for intercepting high-strength concrete in a beam comprises the following steps:
(1) determining an interception position: the part which is half of the height of the column boundary beam and is not less than 500mm is used as a connecting surface of high-strength concrete and low-strength concrete, namely a blocking section;
(2) installing an intercepting device: selecting one beam stirrup which is positioned at a half distance from the height of the column boundary beam and is not less than 500mm as a positioning stirrup; after the stirrups are installed, a plurality of deformed steels are arranged between two beam main reinforcements which are adjacent in the transverse direction, the deformed steels are arranged at the positions of the reinforcement protection layers on the two sides of the beam respectively, the deformed steels are installed in an inclined mode, the deformed steels and the stirrups are installed at an angle of 45 degrees, and the upper portions of the deformed steels are fixed with the stirrups; a reinforcing steel bar which is one grade smaller than the main beam reinforcing steel bar is arranged between two adjacent beam main reinforcing steel bars in the vertical direction;
(3) installing a screw at the lower opening of the template: a screw is arranged at the bottom of the beam and traverses the beam template, and the lower part of the deformed steel bar is abutted against the screw;
(4) pouring concrete: the concrete pump is used for conveying the concrete of the column grade to be in place and vibrating in layers, a 45-degree inclined plane is reserved at the beam slab of the floor, the intercepting device and the screw rod are removed when the concrete is initially set, and then the concrete for pouring the beam slab is pumped.
Preferably, in the step (2), the stirrup is arranged at a distance of 30cm from the column edge.
Preferably, in the step (2), the stirrups are bound by binding wires at a distance of 10 cm.
Preferably, in the step (2), the deformed steel bar is a three-level deformed steel bar with the diameter of 16mm, and the upper part of the deformed steel bar is firmly bound with the stirrup through a binding wire.
Preferably, in the step (2), the length of the upper opening of the deformed steel bar is 50mm higher than the top surface of the beam.
Preferably, in the step (2), the steel bars are bound with the thread steel on two sides of the steel bars.
Preferably, in the step (3), the screw diameter is 18 mm.
Preferably, in the step (3), the screw is sleeved with a plastic sleeve.
Preferably, in the step (4), the intercepting device and the screw removing method are that the binding wires for binding the upper opening of the deformed steel bar and the stirrups are loosened, the deformed steel bar 50mm higher than the upper opening of the concrete is knocked by a hammer to loosen the deformed steel bar, the deformed steel bar is conveniently taken out, and then the screw is removed.
The utility model provides an in roof beam to high strength concrete intercepting device, includes girder main muscle and beam formwork, still includes:
positioning stirrups, wherein one beam stirrup positioned at a position which is half of the height of the column boundary beam and not less than 500mm is selected as the positioning stirrup;
the beam comprises deformed steel bars, a plurality of deformed steel bars and a plurality of reinforcing steel bars, wherein the plurality of deformed steel bars are arranged between two beam main bars which are adjacent in the transverse direction; the deformed steel bar and the stirrup are obliquely arranged at an angle of 45 degrees, and the upper part of the deformed steel bar is fixed with the stirrup;
the reinforcing steel bars are respectively arranged between two vertically adjacent beam main reinforcements;
and the screw rod is arranged at the bottom of the beam, the screw rod transversely penetrates through the beam template, and the lower part of the deformed steel bar abuts against the screw rod.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the intercepting device is reasonably arranged, and the stopping facility is arranged on the template, so that disordered flowing of high-strength concrete is avoided, and the intercepting quality of the high-strength concrete is improved.
2) The invention ensures the concrete strength of the node area, avoids the concrete flowing and cracking of the node area and improves the impression effect of the concrete structure.
3) The intercepting device is simple to manufacture, convenient to install and disassemble, high in working efficiency, high in applicability and capable of being widely applied to complex beam column joint areas.
4) The invention is suitable for the engineering that the beam column node area in the frame structure and the frame shear wall structure is constructed by concrete with different strength grades.
Drawings
FIG. 1 is a view showing the positioning of the position of an intercepting apparatus in embodiment 1 of the present invention;
FIG. 2 is an elevation view of an intercepting apparatus in embodiments 1 and 2 of the present invention;
FIG. 3 is a side view of the intercepting apparatus in examples 1 and 2 of the present invention;
FIG. 4 is a view showing the installation of a check screw in example 1 of the present invention;
FIG. 5 is a view showing the interception of high strength concrete in the girder according to example 1 of the present invention;
in the figure, 1, column high-strength concrete, 2, beam slab low-strength concrete, 3, deformed steel bars, 4, screw rods, 5, frame columns, 6, beam main bars, 7, positioning stirrups, 8 and reinforcing steel bars.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for intercepting high-strength concrete in a beam comprises the following construction process flows:
construction preparation → determination of the position of the intercepting device → manufacture of the intercepting device → installation of a blocking screw at the lower opening of a beam template → pouring of high-strength concrete → dismantling of the intercepting device → pouring of concrete of the beam plate.
1. Preparation for construction
(1) In order to ensure the engineering quality, constructors should be familiar with construction drawings in advance, know the construction content and be familiar with the relevant requirements of the concrete with different strengths in the beam column node area of national specifications, standards and atlas.
(2) And configuring necessary construction equipment, preparing construction machines and tools and mounting materials, and protecting products after construction is finished.
(3) Before construction, technical charge people carry out technical interaction on site constructors, so that the quality is better controlled and the standard requirement is met.
2. Determining the position of an intercepting device
(1) As shown in figure 1, in order to enhance the shearing resistance of the core area of the column node, the interface (the installation position of the intercepting device) of high and low strength grade concrete is used at a position which is half of the height (h/2) and is more than or equal to 500mm away from the side beam of the column.
(2) And (3) calculating the positions of the joint surfaces of the high-strength concrete and the low-strength concrete by field personnel according to a drawing, marking the positions of the joint surfaces of the high-strength concrete and the low-strength concrete on the beam steel bars by using red paint (marking is needed from top to bottom of the intercepting device), and rechecking related data after the beam steel bars are placed in the template so as to avoid large errors caused by the fact that the steel bars are placed downwards.
3. Interception device fabrication and installation
(1) As shown in fig. 4, a beam stirrup 30cm from the side of the column (frame column 5) was selected as the positioning stirrup 7.
(2) The positioning stirrups 7 are bound by binding wires at a binding interval of 10 cm.
(3) As shown in fig. 2-3, after the installation of the positioning stirrup 7 is finished, the installation of the intercepting device is carried out, and the steel reinforcement framework of the intercepting device is phi 16 three-level deformed steel bar 3.
(4) The deformed steel bars 3 are arranged between two adjacent beam main bars 6 in the transverse direction, and the three-level deformed steel bars 3 with the diameter of 16mm are vertically arranged on the positioning stirrups 7 at 45 degrees and are firmly bound by binding wires during installation.
(5) 3 suitable for reading of the third grade deformed steel bar of intercepting device will exceed the roof beam top surface 50mm, guarantee that the intercepting device can be comparatively convenient the taking out before the concrete will set initially.
(6) Two three-level deformed steel bars 3 with the diameter of 16mm must be arranged at the positions of the reinforcing steel bar protection layers on the two sides of the beam, so that the phenomenon of slurry leakage on the side edges during concrete pouring is avoided. And the two vertically adjacent beam main reinforcements 6 are bound by reinforcing steel bars 8 and deformed steel bars 3 which are one grade smaller than the beam main reinforcements.
4. Beam formwork lower opening screw rod installation
(1) As shown in fig. 4, in order to ensure the stability of the intercepting device and avoid the looseness of the concrete during pouring, a screw rod 4 with a diameter of 18mm needs to be arranged at the bottom of the beam to fix the lower part of the framework steel bar.
(2) 4 mounted position of screw rod is steel skeleton end opening position, and the screw rod is located roof beam sill rib below, and intercepting device's end opening supports end opening screw rod 4 down, steel skeleton's stability when guaranteeing concrete placement.
5. High-strength concrete pouring, interception device dismantling and beam slab concrete pouring
(1) The concrete pouring and tamping method of the beam-column joint area comprises the following steps: firstly, a concrete pump is used for conveying concrete (namely, high-strength concrete 1) of a column grade to be in place and vibrated in a layering mode, a 45-degree inclined plane is reserved at a floor beam slab, an intercepting device (comprising deformed steel bars 3 and reinforcing steel bars 8) and a screw rod 4 are removed when the concrete is to be initially set, a beam template at a hole of the screw rod 4 is repaired, and then the concrete (namely, low-strength concrete 2) of the beam slab is poured by pumping. Interception of high strength concrete within the beam is shown in figure 5.
(2) When pouring and tamping concrete of a floor column and a beam plate, the problems of the flowing of high-strength concrete and the cold joint of the adjacent surfaces of high and low strength are mainly controlled.
(3) When the grade difference of the beam column concrete is large, the mix proportion design is carried out so as to meet the requirements of the concrete strength grade and pumpability.
(4) And after the concrete is poured, covering and watering for curing within 12 hours.
6. Intercepting device is demolishd after high strength concrete placement in roof beam
(1) Demolish the intercepting device before the concrete reaches the initial set, loosen the bundle silk of 3 upper mouths of screw-thread steel and 7 ligatures of location stirrup, beat the screw-thread steel 3 that exceeds the concrete upper mouth 50mm departments with the hammer, let screw-thread steel 3 not hard up, conveniently take out framework of steel reinforcement.
(2) The screw rod 4 is detached before the intercepting device is detached, and a plastic sleeve can be additionally arranged outside the screw rod 4 in order to facilitate the detachment of the screw rod 4, and the plastic sleeve does not need to be detached. The removed related materials can be cleaned and reserved for next continuous use.
7. Quality control standard
(1) The raw materials are inspected before construction, and the construction process, the process flow and the detection process are inspected by a retest report of a qualification certificate and a witness sample.
(2) The manufacturing and installation tolerances of the intercepting means should comply with the specifications of table 1.
TABLE 1 manufacturing and installation tolerance (mm) of the intercepting device
Example 2
As shown in fig. 2 and 3, the device for intercepting high-strength concrete in a beam comprises a beam main reinforcement 6 and a beam template, and further comprises:
a plurality of deformed steel bars 3 are arranged between two beam main reinforcements 6 which are adjacent in the transverse direction, and the deformed steel bars 3 are respectively arranged at the positions of the reinforcement protection layers at the two sides of the beam; the deformed steel bar 3 and the stirrup 7 are obliquely arranged at an angle of 45 degrees, and the upper part of the deformed steel bar 3 is fixed with the positioning stirrup 7;
the reinforcing steel bars 8 and the reinforcing steel bars 8 are respectively arranged between two vertically adjacent beam main reinforcements 6;
the screw rod 4 is arranged at the bottom of the beam, the screw rod 4 transversely penetrates through the beam template, and the lower part of the deformed steel bar 3 is propped against the screw rod 4.
The principle is as follows: in the different intensity grade concrete work progress in beam column nodal region, pour according to the principle that the concrete intensity is high earlier afterwards low, post back beam slab earlier, consequently, set up intercepting device in beam column core area roof beam and carry out the shutoff, treat post and beam column core area concrete placement end, demolish intercepting device, the beam slab concrete of pouring again to beam column nodal region concrete intensity has been ensured, beam column nodal region has been avoided the beam column nodal region to take place the shearing damage because of high-strength concrete drooling and has appeared the crack.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (10)
1. A method for intercepting high-strength concrete in a beam is characterized by comprising the following steps:
(1) determining an interception position: the part which is half of the height of the pillar boundary beam and is not less than 500mm is used as the interface of high-strength and low-strength concrete, namely a blocking section;
(2) installing an intercepting device: selecting one beam stirrup which is positioned at a half distance from the height of the column boundary beam and is not less than 500mm as a positioning stirrup; after the stirrups are installed, a plurality of deformed steels are arranged between two beam main reinforcements which are adjacent in the transverse direction, the deformed steels are arranged at the positions of the reinforcement protection layers on the two sides of the beam respectively, the deformed steels are installed in an inclined mode, the deformed steels and the stirrups are installed at an angle of 45 degrees, and the upper portions of the deformed steels are fixed with the stirrups; reinforcing steel bars which are smaller than the beam main bars by one grade are arranged between two vertically adjacent beam main bars;
(3) installing a screw at the lower opening of the template: a screw is arranged at the bottom of the beam and traverses the beam template, and the lower part of the deformed steel bar is abutted against the screw;
(4) pouring concrete: the concrete pump is used for conveying the concrete of the column grade to be in place and vibrating in layers, a 45-degree inclined plane is reserved at the beam slab of the floor, the intercepting device and the screw rod are removed when the concrete is initially set, and then the concrete for pouring the beam slab is pumped.
2. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: in the step (2), the stirrups are arranged at the positions 30cm away from the column sides.
3. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: in the step (2), the stirrups are bound by binding wires, and the binding distance is 10 cm.
4. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: in the step (2), the deformed steel bar is a three-level deformed steel bar with the diameter of 16mm, and the upper part of the deformed steel bar is firmly bound with the stirrup through the binding wire.
5. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: in the step (2), the length of the upper opening of the deformed steel bar is 50mm higher than the top surface of the beam.
6. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: and (3) binding the steel bars with the deformed steel bars on the two sides in the step (2).
7. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: in the step (3), the diameter of the screw is 18 mm.
8. The method for intercepting high-strength concrete in a beam according to claim 1, wherein the method comprises the following steps: and in the step (3), a plastic sleeve is sleeved outside the screw rod.
9. The method for intercepting high-strength concrete in a beam according to claim 1, wherein: in the step (4), the intercepting device and the screw rod dismounting method are that the binding wires for binding the upper opening of the deformed steel bar and the stirrups are loosened, the deformed steel bar 50mm higher than the upper opening of the concrete is knocked by a hammer to loosen the deformed steel bar, the deformed steel bar is conveniently taken out, and then the screw rod is dismounted.
10. The utility model provides an in roof beam to high strength concrete intercepting device, includes girder main muscle and beam formwork, its characterized in that still includes:
positioning stirrups, wherein one beam stirrup positioned at a position which is half of the height of the column boundary beam and not less than 500mm is selected as the positioning stirrup;
the beam comprises deformed steel bars, a plurality of deformed steel bars and a plurality of reinforcing steel bars, wherein the plurality of deformed steel bars are arranged between two beam main bars which are adjacent in the transverse direction; the deformed steel bar and the stirrup are obliquely arranged at an angle of 45 degrees, and the upper part of the deformed steel bar is fixed with the stirrup;
the reinforcing steel bars are respectively arranged between two vertically adjacent beam main reinforcements;
and the screw rod is arranged at the bottom of the beam, the screw rod transversely penetrates through the beam template, and the lower part of the deformed steel bar abuts against the screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210588005.5A CN114876190A (en) | 2022-05-26 | 2022-05-26 | Method and device for intercepting high-strength concrete in beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210588005.5A CN114876190A (en) | 2022-05-26 | 2022-05-26 | Method and device for intercepting high-strength concrete in beam |
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| CN114876190A true CN114876190A (en) | 2022-08-09 |
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| CN202210588005.5A Pending CN114876190A (en) | 2022-05-26 | 2022-05-26 | Method and device for intercepting high-strength concrete in beam |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107724680A (en) * | 2016-08-11 | 2018-02-23 | 五冶集团上海有限公司 | A kind of high-storey building frame structure beam-column node construction method |
| US20200040564A1 (en) * | 2016-10-17 | 2020-02-06 | South China University Of Technology | Reinforced compound concrete beam-column joint containing demolished concrete lumps and a construction method |
| JP2020063634A (en) * | 2018-10-19 | 2020-04-23 | 株式会社安藤・間 | Junction structure and junction method for precast concrete beam member |
| CN214575767U (en) * | 2020-12-04 | 2021-11-02 | 中建五局土木工程有限公司 | Isolating device for high-low grade concrete |
| CN214615477U (en) * | 2021-02-01 | 2021-11-05 | 中建八局第三建设有限公司 | Different intensity concrete construction joint interception tools of beam column node |
| CN214658892U (en) * | 2021-04-22 | 2021-11-09 | 中建八局第一建设有限公司 | High-low grade concrete intercepting device |
| CN217420496U (en) * | 2022-05-26 | 2022-09-13 | 安徽省第二建筑工程有限公司 | Device for intercepting high-strength concrete in beam |
-
2022
- 2022-05-26 CN CN202210588005.5A patent/CN114876190A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107724680A (en) * | 2016-08-11 | 2018-02-23 | 五冶集团上海有限公司 | A kind of high-storey building frame structure beam-column node construction method |
| US20200040564A1 (en) * | 2016-10-17 | 2020-02-06 | South China University Of Technology | Reinforced compound concrete beam-column joint containing demolished concrete lumps and a construction method |
| JP2020063634A (en) * | 2018-10-19 | 2020-04-23 | 株式会社安藤・間 | Junction structure and junction method for precast concrete beam member |
| CN214575767U (en) * | 2020-12-04 | 2021-11-02 | 中建五局土木工程有限公司 | Isolating device for high-low grade concrete |
| CN214615477U (en) * | 2021-02-01 | 2021-11-05 | 中建八局第三建设有限公司 | Different intensity concrete construction joint interception tools of beam column node |
| CN214658892U (en) * | 2021-04-22 | 2021-11-09 | 中建八局第一建设有限公司 | High-low grade concrete intercepting device |
| CN217420496U (en) * | 2022-05-26 | 2022-09-13 | 安徽省第二建筑工程有限公司 | Device for intercepting high-strength concrete in beam |
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