CN108978996B - Outrigger added in existing brick-concrete structure and construction method thereof - Google Patents
Outrigger added in existing brick-concrete structure and construction method thereof Download PDFInfo
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- CN108978996B CN108978996B CN201811100837.8A CN201811100837A CN108978996B CN 108978996 B CN108978996 B CN 108978996B CN 201811100837 A CN201811100837 A CN 201811100837A CN 108978996 B CN108978996 B CN 108978996B
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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
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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
Abstract
The invention relates to an outrigger added in an existing brick-concrete mechanism and a construction method, the outrigger comprises an overhanging part and a built-in part, the overhanging part is a cast-in-place concrete cantilever beam extending from an inner wall of the existing brick-concrete structure and is positioned outside a building, the built-in part consists of joists positioned at two sides of the inner wall, the joists are cast-in-place concrete beams and are connected with the inner wall into a whole, the joists at two sides and the inner wall can bear vertical pressure together to balance load borne by the overhanging part and meet the anti-overturning requirement of the outrigger, longitudinal ribs and hoop ribs are arranged in the joists and the overhanging part, all the longitudinal ribs in the joists extend to the end part of the overhanging part, and the overhanging part and the built-in part are connected into a whole. The cantilever beam added by the invention is simple and easy to construct, and can meet the anti-overturning requirement of the cantilever beam.
Description
Technical Field
The invention relates to the technical field of civil construction, in particular to a cantilever beam added in an existing brick-concrete structure and a construction method thereof.
Background
In the past brick-concrete structural design, outriggers are common, no column is arranged below the outriggers, the space can be used to the maximum extent, and the living requirements of people can be better met. Such as an outside office corridor, a balcony of a house, etc. The cantilever beam needs to meet the requirement of anti-overturning, so the length of the cantilever beam embedded in the masonry and the length of the cantilever beam extracted from the masonry need to meet the requirement. The design specification of a masonry structure BG50003-2001 stipulates that the ratio of the length of a cantilever beam embedded into a masonry to the length of a cantilever beam extracted from the masonry is preferably greater than 1.2; when no masonry is arranged on the cantilever beam, the ratio of the built-in length to the picked-out length is preferably larger than 2.
In recent years, the demand for reinforcing and modifying buildings is continuously increased, and the demand for increasing the outriggers in the existing brick-concrete structure is continuously met, for example, the existing brick-concrete structure increases an outer corridor or a balcony due to limited bottom space, or the outermost side columns exist in the brick-concrete structure but influence the functional requirements, the original columns need to be removed to increase the use space, and the corresponding concrete beams become the outriggers after the columns are dismantled. The setting difficulty of the outriggers in the existing brick-concrete structure is as follows: in order to meet the requirement of overturn resistance, the cantilever beams must be embedded into the masonry for a certain length, but the existing wall body bears the load transmitted by the floor of the floor, the self weight of all the layers of the wall body and the load transmitted by the floor, and in actual construction, the wall body at the position of the cantilever beam cannot be chiseled to arrange the cantilever beam. There is therefore a need for an economically feasible method of adding outriggers to a brick and concrete structure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the cantilever beam added in the existing brick-concrete structure, which has the advantages of simple and easy construction and remarkable economic and social benefits.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an outrigger that increases in existing brick mixes mechanism, is including the portion of encorbelmenting and the portion of building into, the portion of encorbelmenting is the cast-in-place concrete cantilever beam that extends out for the interior wall from existing brick mixes the structure, is located the building outside, the portion of building into comprises the joist that is located the interior wall both sides, the joist is the cast-in-place concrete beam, the joist is connected as an organic whole with the interior wall, and both sides joist and interior wall can bear the load that vertical pressure effect bore with balanced portion of encorbelmenting jointly, satisfy the antidumping requirement of outrigger. All set up in joist, the portion of encorbelmenting and indulge muscle and stirrup, the portion of encorbelmenting and building in the portion of encorbelmenting will be encorbelmented the portion and be connected as a whole with the portion of encorbelmenting in whole indulging the muscle and lead to the tip that extends the portion of encorbelmenting.
Further, the joist is located at the floor bottom elevation position of the building.
Furthermore, the joist and the inner wall are connected into a whole through a plurality of shoulder beams, and longitudinal bars and stirrups are arranged in the shoulder beams.
Furthermore, the distance between the adjacent shoulder beams is not more than 1 m, and the width of the shoulder beam is not less than the length of one brick in the brick-concrete structure.
Furthermore, a wall-through connecting steel bar is arranged between the joists at two sides of the inner wall.
The invention also discloses a construction method for adding the cantilever beam to the existing brick-concrete structure, which comprises the following steps:
step 1: and drilling and chiseling the wall on the inner wall of the building according to the space requirement of the shoulder beam, and arranging the longitudinal bars and the stirrups of the shoulder beam in the chiseled holes.
Step 2: arranging longitudinal bars and stirrups of the joists on two sides of the inner wall, arranging connecting steel bars which penetrate through the inner wall and are connected with the joists on two sides, enabling all longitudinal bars of the joists to penetrate through the outer wall of the building intersected with the joists, extending to the end part of the cantilever part, arranging the longitudinal bars and the stirrups of the cantilever part, and implanting the longitudinal bars outside the position range of the joists in the cantilever part into a brick wall or a ring beam of the building.
And step 3: and (4) performing concrete pouring on the shoulder beam, the joist and the overhanging part.
Further, in the step 2, if the original concrete column at the end of the original concrete beam of the demolished building is changed into the cantilever beam, the cantilever part is formed by pouring a widened and heightened part on the basis of the existing concrete beam, and the cross section of the newly poured widened and heightened part is concave.
Furthermore, in the step 2, if the cantilever beam is an external cantilever beam of the building, the situation of removing the concrete column deflection cantilever beam at the end part of the original concrete beam of the building is not considered, the cantilever part is formed by cast-in-place, and the cross section of the cantilever part is rectangular.
Further, the total width of the rectangular section of the overhanging part is equal to the sum of the widths of the two joists and the thickness of the inner wall of the building.
The invention has the beneficial effects that:
1. according to the invention, the outriggers are added in the existing brick-concrete structure, and during construction, only the hole drilling needs to be carried out on the original wall body, and the original wall body does not need to be dismantled, so that the construction method is simple and easy to implement, and the economic benefit and the social benefit are obvious.
2. According to the invention, the cantilever beam is additionally arranged in the existing brick-concrete structure, and the shoulder beam and the connecting steel bar are arranged to connect the joists on two sides of the built-in part and the inner wall body into a whole, so that the cantilever beam and the inner wall body jointly bear the vertical pressure, and the anti-overturning requirement of the cantilever beam is met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic top view of the overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the invention taken along line A of FIG. 1;
FIG. 3 is a schematic view of the invention taken along line B of FIG. 1;
FIG. 4 is a schematic view of the invention taken along line C of FIG. 1;
FIG. 5 is a schematic top view of the overall structure of embodiment 2 of the present invention;
FIG. 6 is a schematic view of the invention taken along line D of FIG. 5;
the concrete column comprises an outer wall 1, a shoulder beam 2, an inner wall 3, a joist 4, a cantilever 5, a longitudinal rib 6, a stirrup 7, a ring beam 8, a floor slab 9, a connecting steel bar 10, an existing concrete beam 11, an original concrete column 12 and a widened and heightened part 13.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As described in the background art, the outriggers must be embedded into the masonry for a certain length, but the existing wall body bears the load transmitted from the floor of the floor, and also bears the load transmitted from the weight of all the walls and floors of the floor, and in the actual construction, it is impossible to chisel the wall body at the position of the outrigger to arrange the outrigger. Therefore, it is necessary to design an economical and feasible method for adding outriggers in a brick-concrete structure, and in order to solve the above problems, the present application proposes an outrigger added in an existing brick-concrete structure and a construction method.
In example 1, which is an exemplary embodiment of the present application, an outrigger is added to the exterior of the exterior wall of a building, as shown in fig. 1-4, the cantilever beam added in the existing brick-concrete mechanism comprises an overhanging part 5 and a laying-in part which are connected into a whole, the overhanging part is a cast-in-place concrete cantilever beam extending from the inner wall of the existing brick-concrete structure, is positioned outside the building and is vertical to the outer wall 1 of the building, the built-in part consists of joists 4 positioned at two sides of an inner wall 3, the inner wall is vertical to the outer wall of the building, the joist is a cast-in-place concrete beam and is positioned in the building, the joist and the inner wall are connected into a whole and bear the action of vertical pressure together, joist 4 and the portion 5 of encorbelmenting all are equipped with and indulge muscle 6 and stirrup 7, the portion of encorbelmenting will be encorbelmented portion and joist and be connected as a whole to the whole muscle of indulging of joist passes the whole tip that leads to the length of the portion of encorbelmenting that extends of outer wall.
The joist is arranged at the floor bottom elevation position of a floor 9 (a prefabricated floor or a cast-in-place slab).
The joist and the inner wall are connected into a whole through a plurality of shoulder beams 2, the shoulder beams are arranged by chiseling holes on the inner wall and are positioned below a ring beam 8 of a building, and if the building is not provided with the ring beam, the shoulder beams are arranged below a floor slab. The shoulder beam is a cast-in-place concrete beam and is provided with longitudinal bars and stirrups, the distance between the adjacent shoulder beams is not more than 1 m, the width of each shoulder beam is not less than the length of a brick in the brick-concrete structure, and a connecting steel bar 10 penetrating through the inner wall is arranged between the two joists, so that the joists and the inner wall are guaranteed to bear the action of vertical pressure together.
The length of the joist is calculated and determined according to the requirement of the anti-overturning bearing capacity, and the requirement of the ratio of the length of the cantilever beam embedded masonry to the length of the cantilever beam is met in the design specification of masonry structure BG 50003-2001.
The invention also discloses a construction method for adding the cantilever beam to the existing brick-concrete structure, which comprises the following steps:
step 1: and drilling walls and chiseling holes on the wall body in the building according to the space requirement of the shoulder beams, arranging longitudinal bars and stirrups of the shoulder beams in the chiseled holes, and simultaneously drilling holes through which the longitudinal bars and the connecting steel bars pass on the outer wall and the inner wall respectively.
Step 2: set up the scaffold frame, arrange the vertical muscle and the stirrup of joist in the inner wall both sides, arrange the connecting reinforcement who passes the inner wall and connect the both sides joist, the whole muscle of indulging of joist passes the crossing building outer wall with it to extend to the portion tip of encorbelmenting, arrange the muscle and the stirrup of indulging of the portion of encorbelmenting, in the portion of encorbelmenting, set up and indulge the muscle outside the joist position range and implant in the brick wall or the girt of building.
And step 3: after the longitudinal bars and the stirrups of the shoulder beam, the joist and the overhanging part are installed, a template is erected, and concrete pouring is carried out on the shoulder beam, the joist and the overhanging part, wherein the longitudinal bars of the joist penetrate through the position of the outer wall of the building intersected with the longitudinal bars of the joist and are fixed in a mode of injecting glue into holes, the connecting bars penetrate through the position of the inner wall and are fixed in a mode of injecting glue into holes, the concrete pouring mode adopts the existing concrete pouring technology, and detailed description is omitted.
In the step 2, the overhanging part 5 is a newly poured concrete cantilever beam, the cross section of the newly poured concrete cantilever beam is rectangular, the width h of the rectangle is equal to the sum of the width b of the two joists and the thickness a of the inner wall, namely h is 2b + a
In an exemplary embodiment of the present application, embodiment 2 is a case of removing an original concrete column 12 from an end of an original concrete beam of a building, and as shown in fig. 5 to 6, the cantilever includes an existing concrete beam 11 of the building and a newly cast widening and heightening portion 13, the cross-sectional shape of the widening and heightening portion is a "concave" type, and longitudinal bars and stirrups are arranged, all the longitudinal bars of the joist are extended to the end of the widening and heightening portion, and the construction method of the widening and heightening portion is the same as that of a common beam, and other structures and construction methods are the same as those of embodiment 1.
According to the cantilever beam, the shoulder beam and the connecting steel bars are arranged, the built-in part of the cantilever beam is connected with the inner wall into a whole, the longitudinal bars of the joist extend to the end part of the cantilever part, the cantilever part and the joist are connected into a whole, the joist and the inner wall bear the vertical pressure effect together, the vertical load borne by the cantilever part is balanced, the anti-overturning requirement of the cantilever beam is met, meanwhile, the original wall body does not need to be dismantled during construction, the construction is convenient, and the economic benefit and the social benefit are obvious.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (8)
1. The cantilever beam added in the existing brick-concrete mechanism is characterized by comprising an overhanging part and a building-in part, wherein the overhanging part is a cast-in-place concrete cantilever beam extending out of an inner wall of an existing brick-concrete structure and located outside a building, the building-in part consists of joist beams located on two sides of the inner wall, the joist beams are cast-in-place concrete beams and connected with the inner wall into a whole, the joist beams on two sides and the inner wall can bear vertical pressure together to balance load borne by the overhanging part and meet the anti-overturning requirement of the cantilever beam, longitudinal ribs and stirrups are arranged in the joist and the overhanging part, all the longitudinal ribs in the joist extend to the end part of the overhanging part, and the overhanging part and the building-in part are connected into a whole;
the joist and the inner wall are connected into a whole through a plurality of shoulder beams; and connecting steel bars penetrating through the wall are arranged between the joists at the two sides of the inner wall.
2. An additional outrigger for an existing brick and concrete structure as claimed in claim 1 wherein said joist is located at a floor elevation of the building.
3. An additional outrigger in an existing brick and concrete structure as claimed in claim 1 wherein said shoulder beam is provided with longitudinal and hoop reinforcement.
4. An additional outrigger for an existing masonry unit as claimed in claim 1 wherein the distance between adjacent said shoulder beams is no greater than 1 meter and the shoulder beam width is no less than one brick length in the masonry unit.
5. A construction method of an additional outrigger in an existing brick and concrete structure as claimed in any one of claims 1 to 4, comprising the steps of:
step 1: drilling and chiseling a wall on the inner wall of the building according to the space requirement of the shoulder beams, and arranging longitudinal bars and stirrups of the shoulder beams in the chiseled holes;
step 2: arranging longitudinal bars and stirrups of the joists on two sides of the inner wall, arranging connecting reinforcements penetrating through the inner wall and connecting the joists on two sides, wherein all the longitudinal bars of the joists penetrate through the outer wall of the building intersected with the joists and extend to the end part of the overhanging part, arranging the longitudinal bars and the stirrups of the overhanging part, and implanting the longitudinal bars positioned outside the position range of the joists in the overhanging part into a brick wall or a ring beam of the building;
and step 3: and (4) performing concrete pouring on the shoulder beam, the joist and the overhanging part.
6. The construction method according to claim 5, wherein in the step 2, if the original concrete column at the end of the original concrete beam of the demolished building is changed into the cantilever in the step 2, the cantilever is formed by pouring a widened and heightened part on the basis of the existing concrete beam, and the cross-sectional shape of the newly poured widened and heightened part is concave.
7. The construction method according to claim 6, wherein in the step 2, if the cantilever beam is an external cantilever beam of the building, the situation is not the situation of removing a concrete column deflection cantilever beam at the end part of an original concrete beam of the building, the cantilever part is formed by cast-in-place, and the cross section of the cantilever part is rectangular.
8. The construction method according to claim 7, wherein the total width of the rectangular section of the cantilever is equal to the sum of the width of the two joists and the thickness of the inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811100837.8A CN108978996B (en) | 2018-09-20 | 2018-09-20 | Outrigger added in existing brick-concrete structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811100837.8A CN108978996B (en) | 2018-09-20 | 2018-09-20 | Outrigger added in existing brick-concrete structure and construction method thereof |
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| Publication Number | Publication Date |
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| CN108978996A CN108978996A (en) | 2018-12-11 |
| CN108978996B true CN108978996B (en) | 2020-08-11 |
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| CN201811100837.8A Active CN108978996B (en) | 2018-09-20 | 2018-09-20 | Outrigger added in existing brick-concrete structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110004937B (en) * | 2019-03-19 | 2023-12-29 | 上海申元岩土工程有限公司 | Joint structure of joint of upright post and support beam and plate in foundation pit engineering |
| CN114541570A (en) * | 2022-03-04 | 2022-05-27 | 中建八局第二建设有限公司 | Organ type outer vertical surface structure and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL9300224A (en) * | 1993-02-04 | 1994-09-01 | Johannes Boontje | Device for temporarily supporting a facade or building wall of a building. |
| CN102704663A (en) * | 2012-06-27 | 2012-10-03 | 江苏正威建设有限公司 | Down-stayed type suspension style scaffold |
| CN203977890U (en) * | 2014-07-29 | 2014-12-03 | 苏州中固建筑科技有限公司 | A kind of novel reinforcing balcony structure |
| CN106150088B (en) * | 2016-08-11 | 2019-07-26 | 上海嘉实（集团）有限公司 | Large cantilever beam slab combined type formwork system and construction method |
| CN206503378U (en) * | 2016-11-29 | 2017-09-19 | 中国电建集团成都勘测设计研究院有限公司 | Newly-increased outrigger constructing structure |
| CN207003670U (en) * | 2017-07-14 | 2018-02-13 | 中建科技湖南有限公司 | A kind of new prefabricated overhanging component |
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