CN115434539B - Newly-increased bare concrete cantilever structure of existing building and connection method - Google Patents
Newly-increased bare concrete cantilever structure of existing building and connection method Download PDFInfo
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- CN115434539B CN115434539B CN202211401620.7A CN202211401620A CN115434539B CN 115434539 B CN115434539 B CN 115434539B CN 202211401620 A CN202211401620 A CN 202211401620A CN 115434539 B CN115434539 B CN 115434539B
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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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
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
The invention discloses a newly-added bare concrete cantilever structure of an existing building and a connection method, belongs to the technical field of existing building reinforcement and reconstruction, and solves the problem that the existing building cannot be provided with the newly-added bare concrete cantilever structure in the prior art. In the structure, a newly added floor cantilever beam is connected with an inner span floor beam to form a floor cantilever structure; the newly-added roof cantilever beam is connected with the inner span roof beam to form a roof cantilever structure; the contact surface between the newly added floor cantilever beam and the inner span floor beam is zigzag; the beam top elevation of the newly added floor cantilever beam is higher than the beam top elevation of the existing floor beam; the beam top elevation of the newly-added roof cantilever beam is higher than that of the existing roof beam. Prefabricating a newly-added floor cantilever beam and a newly-added roof cantilever beam; and forming the inner span floor beam and the inner span roof beam on a construction site. The structure and the method can be used for newly adding a bare concrete cantilever structure to the existing building.
Description
Technical Field
The invention belongs to the technical field of existing building reinforcement and reconstruction, and particularly relates to a newly-added large-span bare concrete cantilever structure and a connection method for an existing building.
Background
The structure of encorbelmenting is increased all around on the basis of existing building, and the main way is: newly-increased girder steel of encorbelmenting passes through the crab-bolt to be connected with existing building structure boundary beam, corresponds newly-increased girder steel position of encorbelmenting and sets up the girder steel of being no less than 2 strides under existing structure concrete floor, and this girder steel passes through the crab-bolt with former concrete beam to be connected to solve newly-increased girder steel of encorbelmenting flange pressure torsion effect to the side roof beam production. Newly-increased girder steel roof beam top mark of encorbelmenting is higher than a flange thickness of existing building concrete floor face, corresponds newly-increased girder steel flange position at concrete floor face and sets up continuous at least 2 steel sheet areas of striding, and this steel sheet area adopts butt weld with newly-increased girder steel flange to be connected, and this steel sheet area passes through the bolt that runs through the original structure floor and newly-increased girder steel top flange under the board is connected to guaranteed the tensile effective transmission of girder steel top flange that encorbelments.
However, at present, the scheme of adding a new bare concrete cantilever structure to the existing building cannot be realized in the prior art.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a new bare concrete cantilever structure for an existing building and a connection method thereof, and solves the problem that the existing building cannot realize the new bare concrete cantilever structure.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides a new bare concrete cantilever structure for an existing building, which comprises a new floor cantilever beam, an inner-span floor beam, a floor connecting longitudinal rib, a new roof cantilever beam, an inner-span roof beam and a roof connecting longitudinal rib; the inner-span floor beam is arranged on the existing floor beam, and the newly added floor cantilever beam is connected with the inner-span floor beam through the floor connecting longitudinal rib to form a floor cantilever structure; the inner span roof beam is arranged on the existing roof beam, and the newly-added roof cantilever beam is connected with the inner span roof beam through the roof connecting longitudinal rib to form a roof cantilever structure; newly adding floor cantilever beams and newly adding roof cantilever beams which are clean water concrete cantilever beams; newly-added floor cantilever beams are prefabricated parts, and inner-span floor beams are cast-in-place parts; the contact surface of the newly-added floor cantilever beam and the inner-span floor beam is zigzag, and the zigzag single-tooth shape comprises an inclined edge, a first arc-shaped edge, a vertical edge and a second arc-shaped edge which are sequentially connected; the beam top elevation of the newly-added floor cantilever beam is higher than that of the existing floor beam, the outmost floor connecting longitudinal rib at the upper part of the newly-added floor cantilever beam passes through the upper surface of the existing floor beam, and the second floor connecting longitudinal rib at the upper part of the newly-added floor cantilever beam is connected with the existing floor beam through a local pick chisel; the beam top elevation of the newly-added roof cantilever beam is higher than that of the existing roof beam; the roof connecting longitudinal bars are all connected with the inner span roof beam and only pass through the upper surface of the existing roof beam.
Furthermore, the inner-span floor beam is connected with the existing floor beam through the floor shear-resistant steel bars.
Further, the floor shear reinforcement is short muscle or shaped steel.
Furthermore, the inner span roof beam is connected with the existing roof beam through the roof shear steel bar.
Further, the roof shear reinforcement is short reinforcement or shaped steel.
Furthermore, the cross section of the cantilever beam of the newly added floor is T-shaped; and/or the cross section of the newly-added roof cantilever beam is in a T shape.
Furthermore, the number of the floor connecting longitudinal ribs is multiple, and the multiple floor connecting longitudinal ribs are arranged in multiple layers; and/or the number of the roof connecting longitudinal ribs is multiple, and the multiple roof connecting longitudinal ribs are arranged in multiple layers.
Furthermore, the standard height difference between the beam top of the cantilever beam of the newly added floor and the beam top of the beam of the existing floor is 40-70mm.
Furthermore, the height difference between the beam top of the cantilever beam of the newly added floor and the beam top of the beam of the existing floor is 40mm, 48mm, 50mm, 56mm, 63mm, 66mm or 70mm.
Furthermore, the standard height difference between the beam top of the newly-added roof cantilever beam and the beam top of the existing roof beam is 180-230mm.
Furthermore, the height difference between the beam top of the newly-added roof cantilever beam and the beam top of the existing roof beam is 180mm, 200mm, 220mm or 230mm.
Further, above-mentioned existing building newly increases clear water concrete structure of encorbelmenting still includes frame post reinforcement, and frame post reinforcement includes the back up coat and locates and consolidate intraformational reinforcement short rib, and the back up coat parcel has the frame post, and the back up coat is through consolidating short rib and existing frame post fixed connection.
Further, frame post reinforcement still includes the reinforcement stirrup, and the reinforcement stirrup is binded in the outer wall of back up coat.
Further, the thickness of the reinforcing layer is 150 to 250mm.
Further, the thickness of the reinforcing layer is 150mm, 165mm, 188mm, 210mm, 235mm or 250mm.
The invention also provides a connecting method of the newly-added bare concrete cantilever structure of the existing building, which is used for connecting the newly-added bare concrete cantilever structure of the existing building, and the connecting method comprises the following steps:
step 1: prefabricating a newly-added floor cantilever beam and a newly-added roof cantilever beam, inserting a floor connecting longitudinal rib into the newly-added floor cantilever beam in the process of prefabricating the newly-added roof cantilever beam of the newly-added floor cantilever beam, wherein the end part of the floor connecting longitudinal rib is exposed, inserting a roof connecting longitudinal rib into the newly-added roof cantilever beam, and the end part of the roof connecting longitudinal rib is exposed;
step 2: conveying the newly-added floor cantilever beam and the newly-added roof cantilever beam to a construction site;
and 3, step 3: hoisting the prefabricated newly-added floor cantilever beam to a specified position on a construction site, so that the exposed floor connecting longitudinal rib is positioned above the existing floor beam;
hoisting the prefabricated newly-added roof cantilever beam to a specified position, and enabling the exposed roof connecting longitudinal rib to be positioned above the existing roof beam;
and 4, step 4: according to the design appearance of the inner span floor beam and the inner span roof beam, respectively manufacturing grouting cavities, grouting concrete slurry into the grouting cavities, respectively forming the inner span floor beam and the inner span roof beam after curing, wrapping the exposed floor connecting longitudinal rib by the inner span roof beam, wrapping the exposed roof connecting longitudinal rib by the inner span roof beam, and completing the connection of the newly-increased clear water concrete cantilever structure of the existing building.
Compared with the prior art, the invention can realize at least one of the following beneficial effects.
A) The newly-added fair-faced concrete cantilever structure of the existing building comprehensively adopts various reinforcing methods, for example, the newly-added floor cantilever beam and the inner-crossing floor beam are stably connected through the floor connecting longitudinal ribs, the newly-added roof cantilever beam and the inner-crossing roof beam are stably connected through the roof connecting longitudinal ribs, and the newly-added floor cantilever beam and the newly-added roof cantilever beam have a fair-faced concrete effect, so that the newly-added fair-faced concrete cantilever structure of the existing building can be realized.
B) According to the newly-added fair-faced concrete cantilever structure for the existing building, provided by the invention, through the arrangement of the frame beam reinforcing part, the frame column reinforcing part comprises the reinforcing layer and the reinforcing short ribs arranged in the reinforcing layer, the existing frame column is reinforced by adopting the cross section expanding method, and on one hand, the internal force of the frame column is increased due to the weight of the newly-added cantilever structure, and the stress requirement of the frame column per se needs to be met; on the other hand, the floor and the roof cantilever beam longitudinal bars can pass through the enlarged area as much as possible, and the anchoring effect of the beam longitudinal bars in the columns is enhanced.
C) In the newly-increased bare concrete cantilever structure for the existing building, in order to improve the contact stability between the newly-increased floor cantilever beam and the inner-span floor beam, the contact surface of the newly-increased floor cantilever beam and the inner-span floor beam is in a sawtooth shape, so that the roughness between the contact surfaces of the newly-increased floor cantilever beam and the inner-span floor beam is increased equivalently, and the sawtooth contact surface can effectively improve the connection strength between the newly-increased floor cantilever beam and the inner-span floor beam.
D) According to the newly-added bare concrete cantilever structure for the existing building, due to the arrangement of the zigzag position, the problem that concrete slurry cannot be poured to the zigzag corners possibly occurs in the production process of the newly-added floor cantilever beam and the grouting process of the newly-added floor cantilever beam, through the design of the single-tooth shape, the single-tooth shape comprises the inclined edge, the first arc-shaped edge, the vertical edge and the second arc-shaped edge which are sequentially connected, the concrete slurry can flow into the zigzag corners along the inclined edge and the first arc-shaped edge, and then flow into the next single tooth along the vertical edge and the second arc-shaped edge, so that the concrete slurry can be guaranteed to be poured into the zigzag corners.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the figures;
fig. 1 is a schematic structural diagram of a newly-added bare concrete cantilever structure of an existing building according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view C-C of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1;
FIG. 6 is a cross-sectional view E-E of FIG. 1;
fig. 7 is a schematic structural view of a zigzag structure of a newly added floor cantilever beam in a newly added bare concrete cantilever structure of an existing building according to a first embodiment of the present invention;
fig. 8 is a flowchart of a method for connecting a new bare concrete cantilever structure of an existing building according to a second embodiment of the present invention.
Reference numerals are as follows: 1-newly adding a floor cantilever beam; 101-a beveled edge; 102-a first arc-shaped edge; 103-vertical edge; 104-a second arc-shaped edge; 2-inner span floor beam; 3-floor connecting longitudinal bars; 4-newly adding a roof cantilever beam; 5-inside span roof beam; 6-roof connecting longitudinal bars; 7-existing floor beam; 8-existing roof beams; 9-a reinforcing layer; 10-reinforcing short ribs; 11-existing frame posts; 12-reinforcing stirrup.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The new overhanging knot solution of the existing building mainly focuses on increasing overhanging steel beams, taking measures to ensure the reliable connection of the steel beams and the main structure of the existing building and how to strengthen the anti-torsion capability of the boundary beams of the existing building structure.
Example one
This embodiment provides a new bare concrete overhanging structure that increases of existing building, refer to fig. 1 to 7, including newly-increased floor cantilever beam 1, interior floor roof beam 2 of striding, the floor is connected and is indulged muscle 3, newly-increased roof cantilever beam 4, interior roof beam 5 of striding and roof are connected and indulge muscle 6, wherein, interior floor roof beam 2 of striding is located on existing floor beam 7, newly-increased floor cantilever beam 1 is connected with interior floor roof beam 2 of striding through the floor is indulged muscle 3 and is connected, thereby can form the floor cantilever structure, interior roof beam 5 of striding is located on existing roof beam 8, newly-increased roof cantilever beam 4 is connected through roof connection and is indulged muscle 6 and interior roof beam 5 of striding and be connected, thereby can form the roof cantilever structure, newly-increased floor cantilever beam 1 and newly-increased roof cantilever beam 4 are bare concrete cantilever beam, have the bare concrete effect.
Compared with the prior art, the newly-added fair-faced concrete cantilever structure of the existing building comprehensively adopts multiple reinforcing methods, for example, the newly-added floor cantilever beam 1 and the inner-span floor beam 2 are stably connected through the floor connecting longitudinal rib 3, the newly-added roof cantilever beam 4 and the inner-span roof beam 5 are stably connected through the roof connecting longitudinal rib 6, and the newly-added floor cantilever beam 1 and the newly-added roof cantilever beam 4 have a fair-faced concrete effect, so that the newly-added fair-faced concrete cantilever structure of the existing building can be realized.
In order to ensure the transmission of force between the interface between the inner-span floor beam 2 and the existing floor beam 7, the two beams may be connected by a floor shear reinforcement (e.g., a short reinforcement or a profile steel).
Similarly, for the connection between the inner span roof beam 5 and the existing roof beam 8, the two may be connected by a roof shear bar (e.g., a short bar or a section steel, etc.) in order to ensure the transmission of interfacial forces.
In order to effectively simplify the arrangement of indulging the muscle in beam column node core space floor connection of newly-increased floor cantilever beam 1, high-efficient performance floor is connected the tensile strength who indulges the muscle, and the shape of newly-increased floor cantilever beam 1 cross section is T shape.
Specifically, the number of the floor connecting longitudinal ribs 3 is plural, and the plural floor connecting longitudinal ribs 3 are arranged in multiple layers. Similarly, the number of the roof connecting longitudinal ribs 6 is plural, and the plural roof connecting longitudinal ribs 6 are arranged in plural layers.
In order to reduce damage to the existing floor beam 7, the beam top elevation of the newly added floor cantilever beam 1 is higher than that of the existing floor beam 7, and the elevation difference between the newly added floor cantilever beam 1 and the existing floor beam 7 is 40-70mm, such as 40mm, 48mm, 50mm, 56mm, 63mm, 66mm or 70mm. Through the mode that occupies the existing floor building of part for the outermost floor on newly-increased floor cantilever beam 1 upper portion is connected and is indulged muscle 3 and all pass through from the upper surface of existing floor roof beam 7, and the second floor on newly-increased floor cantilever beam 1 upper portion is connected and is indulged muscle 3 and be connected with existing floor roof beam 7 through the local existing floor roof beam 7 of picking the chisel, thereby can significantly reduce the concrete pick-and-chisel volume to existing floor roof beam 7, reduce the damage to existing building.
Similarly, in order to reduce damage to the existing roof beam 8, the roof elevation of the newly added roof cantilever beam 4 is higher than that of the existing roof beam 8, and the elevation difference between the two is 180 to 230mm, for example, 180mm, 200mm, 220mm or 230mm. By using a part of roof building, the general building requirements of the part of roof are not strict, and the structure can be utilized, so that the roof connecting longitudinal ribs 6 are all connected with the inner span roof beam 5 and only pass through the upper surface of the existing roof beam 8, and the original structure is not damaged completely.
In order to effectively simplify the arrangement of the roof connecting longitudinal ribs 6 in the beam-column joint core area of the newly-added roof cantilever beam 4 and efficiently exert the tensile strength of the roof connecting longitudinal ribs 6, the cross section of the newly-added roof cantilever beam 4 is in a T shape.
Considering the increase of the bare concrete cantilever structure, the load bearing of each original structural member of the existing building frame beam can be increased, and therefore, the newly-increased bare concrete cantilever structure of the existing building also comprises a frame column reinforcing member.
Specifically, the frame column reinforcement comprises a reinforcing layer 9 (for example, a reinforced concrete reinforcing layer) and a reinforcing short rib 10 arranged in the reinforcing layer 9, wherein the reinforcing layer 9 wraps an existing frame column 11, and the reinforcing layer 9 is fixedly connected with the existing frame column 11 through the reinforcing short rib 10. In this way, the existing frame column 11 is reinforced by adopting the cross section expanding method through the arrangement of the frame beam reinforcing parts (namely the reinforcing layer 9 and the reinforcing short ribs 10), on one hand, the internal force of the existing frame column 11 is increased due to the weight of the newly-added fresh water concrete cantilever structure, and the self stress requirement of the existing frame column 11 needs to be met; on the other hand, the floor connecting longitudinal rib and the roof connecting longitudinal rib of the newly added floor cantilever beam and the newly added roof cantilever beam can pass through an expanded area (namely, a frame column reinforcing part area) as much as possible, so that the anchoring effect of the floor connecting longitudinal rib and the roof connecting longitudinal rib in the existing frame column 11 and the frame beam reinforcing part can be enhanced.
In order to further improve the overall structure intensity of the existing frame column 11, the frame column reinforcing member further comprises reinforcing stirrups 12, the reinforcing stirrups 12 are bound on the outer wall of the reinforcing layer 9, and the overall structure intensity of the existing frame column 11 can be further improved through the arrangement of the reinforcing stirrups 12.
Illustratively, the thickness of the reinforcing layer 9 is 150 to 250mm, for example, 150mm, 165mm, 188mm, 210mm, 235mm, or 250mm.
In order to effectively improve the construction efficiency, the newly-added floor cantilever beam 1 can be a prefabricated part, and the inner-span floor beam 2 is a cast-in-place part.
Considering that the construction modes are different, the contact surfaces of the new floor cantilever beam 1 and the inner-span floor beam 2 inevitably have certain difference, and in order to improve the contact stability between the new floor cantilever beam 1 and the inner-span floor beam 2, the contact surface of the new floor cantilever beam 1 and the inner-span floor beam 2 is zigzag, so that the roughness between the contact surfaces of the new floor cantilever beam 1 and the inner-span floor beam 2 is increased equivalently, and the zigzag contact surface can more effectively improve the connection strength between the new floor cantilever beam 1 and the inner-span floor beam 2.
For the zigzag single tooth shape, specifically, an inclined side 101, a first arc-shaped side 102, a vertical side 103 and a second arc-shaped side 104 are included in this order. This is because, because the setting at zigzag position, can appear the unable problem of pouring into the zigzag corner of concrete slurry in the production process of newly-increased floor cantilever beam 1 and the grout in-process of newly-increased floor cantilever beam 1, through the design to the monodentate shape, concrete slurry can flow into the zigzag corner along inclined edge 101 and first arc limit 102, then, flows into next monodentate along vertical limit 103 and second arc limit 104 to can guarantee that concrete slurry can pour into the zigzag corner.
Example two
The embodiment also provides a connection method of a newly-added bare concrete cantilever structure of an existing building, which is used for the connection of the newly-added bare concrete cantilever structure of the existing building in the first embodiment with reference to fig. 8, and the connection method includes the following steps:
step 1: prefabricating a newly-added floor cantilever beam and a newly-added roof cantilever beam, inserting a floor connecting longitudinal rib into the newly-added floor cantilever beam in the process of prefabricating the newly-added floor cantilever beam and the newly-added roof cantilever beam, wherein the end part of the floor connecting longitudinal rib is exposed, inserting a roof connecting longitudinal rib into the newly-added roof cantilever beam, and the end part of the roof connecting longitudinal rib is exposed;
step 2: respectively conveying the prefabricated newly-increased floor cantilever beam and the newly-increased roof cantilever beam to a construction site;
and 3, step 3: hoisting the prefabricated newly-added floor cantilever beam to a designed designated position on a construction site, so that the exposed floor connecting longitudinal rib is positioned above the existing floor beam and in the design space of the inner-span floor beam;
in a construction site, hoisting the prefabricated newly-added roof cantilever beam to a designed designated position, so that the exposed roof connecting longitudinal rib is positioned above the existing roof beam and in the design space of the inner-span roof beam;
and 4, step 4: according to the design appearance of the inner-span floor beam and the inner-span roof beam, grouting cavities for the inner-span floor beam and the inner-span roof beam are respectively manufactured, concrete slurry is respectively poured into the grouting cavities of the inner-span floor beam and the inner-span roof beam, the inner-span floor beam and the inner-span roof beam are respectively formed after standing and curing, meanwhile, the exposed floor connecting longitudinal rib is wrapped by the inner-span roof beam, and the exposed roof connecting longitudinal rib is wrapped by the inner-span roof beam, so that the connection of a newly-built bare concrete cantilever structure of the existing building is completed.
Compared with the prior art, the beneficial effect of the connection of the existing building newly-increased bare concrete cantilever structure that this embodiment provided is the same basically as the beneficial effect of the existing building newly-increased bare concrete cantilever structure that embodiment one provided, and this is not repeated again.
Claims (10)
1. A new bare concrete cantilever structure added to an existing building is characterized by comprising a newly added floor cantilever beam, an inner-span floor beam, a floor connecting longitudinal rib, a new added roof cantilever beam, an inner-span roof beam and a roof connecting longitudinal rib;
the inner-span floor beam is arranged on the existing floor beam, and the newly-added floor cantilever beam is connected with the inner-span floor beam through the floor connecting longitudinal rib to form a floor cantilever structure; the new roof cantilever beam is connected with the inner span roof beam through a roof connecting longitudinal rib to form a roof cantilever structure; the newly-added floor cantilever beam and the newly-added roof cantilever beam are clear water concrete cantilever beams;
the newly-added floor cantilever beam is a prefabricated part, and the inner-span floor beam is a cast-in-place part; the contact surface of the newly-added floor cantilever beam and the inner-span floor beam is zigzag, and the zigzag single-tooth shape comprises an inclined edge, a first arc-shaped edge, a vertical edge and a second arc-shaped edge which are sequentially connected;
the beam top elevation of the newly-added floor cantilever beam is higher than that of the existing floor beam, the outermost floor connecting longitudinal rib on the upper portion of the newly-added floor cantilever beam passes through the upper surface of the existing floor beam, and the second floor connecting longitudinal rib on the upper portion of the newly-added floor cantilever beam is connected with the existing floor beam through local chiseling;
the beam top elevation of the newly-added roof cantilever beam is higher than that of the existing roof beam; the roof connecting longitudinal bars are all connected with the inner span roof beam and only pass through the upper surface of the existing roof beam.
2. The bare concrete cantilever structure added to the existing building according to claim 1, wherein the inner-span floor beam is connected with the existing floor beam through a floor shear steel bar.
3. The bare concrete cantilever structure added to the existing building according to claim 1, wherein the inner span roof beam is connected with the existing roof beam by a roof shear reinforcement.
4. The newly-added bare concrete cantilever structure for the existing building according to claim 1, wherein the cross section of the newly-added floor cantilever beam is T-shaped;
and/or the cross section of the newly-added roof cantilever beam is T-shaped.
5. The newly-added fair-faced concrete cantilever structure of the existing building as claimed in claim 1, wherein the number of the roof connecting longitudinal bars is multiple, and the multiple roof connecting longitudinal bars are arranged in multiple layers.
6. The newly-added bare concrete cantilever structure for the existing building according to claim 1, wherein the height difference between the beam top of the newly-added floor cantilever beam and the beam top of the existing floor beam is 40-70mm.
7. The newly-added fair-faced concrete cantilever structure of the existing building as claimed in claim 1, wherein the standard height difference between the top of the newly-added roof cantilever beam and the top of the existing roof beam is 180 to 230mm.
8. The newly-added bare concrete cantilever structure for the existing building according to any one of claims 1 to 7, further comprising a frame column reinforcing member, wherein the frame column reinforcing member comprises a reinforcing layer and a reinforcing short rib arranged in the reinforcing layer, the reinforcing layer wraps the existing frame column, and the reinforcing layer is fixedly connected with the existing frame column through the reinforcing short rib.
9. The newly-built bare concrete cantilever structure of the existing building according to claim 8, wherein the thickness of the reinforcing layer is 150 to 250mm.
10. A method of connecting a newly-augmented bare concrete cantilever structure of an existing building, for use in connection with a newly-augmented bare concrete cantilever structure of an existing building as claimed in any one of claims 1 to 9, the method comprising the steps of:
step 1: prefabricating a newly-added floor cantilever beam and a newly-added roof cantilever beam, inserting a floor connecting longitudinal rib into the newly-added floor cantilever beam in the process of prefabricating the newly-added floor cantilever beam and the newly-added roof cantilever beam, wherein the end part of the floor connecting longitudinal rib is exposed, inserting a roof connecting longitudinal rib into the newly-added roof cantilever beam, and the end part of the roof connecting longitudinal rib is exposed;
and 2, step: transporting the newly added floor cantilever beam and the newly added roof cantilever beam to a construction site;
and 3, step 3: hoisting the prefabricated newly-added floor cantilever beam to a specified position on a construction site, so that the exposed floor connecting longitudinal rib is positioned above the existing floor beam;
hoisting the prefabricated newly-added roof cantilever beam to a specified position, and enabling the exposed roof connecting longitudinal rib to be positioned above the existing roof beam;
and 4, step 4: according to the design appearance of the inner-span floor beam and the inner-span roof beam, grouting cavities are respectively manufactured, concrete slurry is poured into the grouting cavities, the inner-span floor beam and the inner-span roof beam are respectively formed after solidification, the exposed floor connecting longitudinal bar is wrapped by the inner-span roof beam, the exposed roof connecting longitudinal bar is wrapped by the inner-span roof beam, and connection of the newly-added fair-faced concrete cantilever structure of the existing building is completed.
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| CN202211401620.7A CN115434539B (en) | 2022-11-10 | 2022-11-10 | Newly-increased bare concrete cantilever structure of existing building and connection method |
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| CN202211401620.7A CN115434539B (en) | 2022-11-10 | 2022-11-10 | Newly-increased bare concrete cantilever structure of existing building and connection method |
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| KR100897342B1 (en) * | 2007-08-21 | 2009-05-15 | 삼성물산 주식회사 | Floor extension method using hybrid structure |
| CN102720304A (en) * | 2012-06-15 | 2012-10-10 | 吴方伯 | Reinforced concrete composite beam |
| CN106907017A (en) * | 2017-04-24 | 2017-06-30 | 华东建筑设计研究院有限公司 | The ruggedized construction and method of the existing prefabricated ledger beam of multilayer Box linear programming |
| CN208184267U (en) * | 2018-03-08 | 2018-12-04 | 温州宏量机械科技有限公司 | A kind of newly-increased Cantilever Beams connection structure |
| CN209760446U (en) * | 2019-03-20 | 2019-12-10 | 河南元邦工程技术有限公司 | Steel structural framework old building post roof beam node reinforced structure |
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2022
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Inventor after: Li Xinggang Inventor after: Sun Hailin Inventor after: Sun Qingtang Inventor after: Yuan Zhimin Inventor after: Sun Yuanyuan Inventor after: Huo Wenying Inventor after: Yi Lingjie Inventor after: Qiu Jianbing Inventor after: Tan Zeyang Inventor before: Li Xinggang Inventor before: Sun Hailin Inventor before: Sun Qingtang Inventor before: Yuan Zhimin |