Existing cantilever beam lengthening structure
By adding new reinforcing bars on the underside of the cantilever beam and making reliable connections, the problems of difficulty in adding top reinforcing bars when extending the cantilever beam and the inconvenience of multi-layer welding construction are solved, thus achieving both safety and ease of construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-07
AI Technical Summary
When extending existing cantilever beams, the original beam top longitudinal reinforcement is dense, the space for rebar installation is narrow, the quality of traditional rebar installation is difficult to guarantee, steel plate bonding poses safety hazards, and the working surface for welding multi-layer steel bars is small, making construction inconvenient.
New bottom reinforcement, web reinforcement, and stirrups are added to the underside of the original cantilever beam. These are connected by welding and binding to increase the beam's flexural capacity, reduce the need for top reinforcement, optimize the cantilever beam's cross-section, and reduce concrete usage by adopting a single-layer welding and inclined section design. This ensures reliable connection and convenient construction.
It effectively improves the flexural bearing capacity of cantilever beams, meets the structural stress requirements, avoids the need for additional top reinforcement, ensures safety, simplifies the construction process, reduces concrete usage, and increases usable space.
Smart Images
Figure CN224093030U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of building reconstruction, especially to a cantilever beam lengthening structure of existing building. BACKGROUND
[0002] With the continuous development of society, the reinforcement and reconstruction of existing buildings have become an important issue faced by the construction industry. In order to meet the needs of new functions of buildings, the cantilever beam of the original structure needs to be lengthened in some cases.
[0003] The lengthening of the cantilever beam of the existing building leads to an increase in the bending moment at the top of the beam, and the original longitudinal reinforcement at the top of the beam needs to be increased. Since the longitudinal reinforcement at the top of the existing cantilever beam is often dense, if the traditional method of planting reinforcement is used to increase the reinforcement, the space for planting reinforcement is small, and the quality of the planted reinforcement is difficult to guarantee the tensile performance of the reinforcement, which poses a certain safety hazard. If the method of sticking steel plates at the top of the beam is used to increase the reinforcement, it often conflicts with the original wall column at the fixed end of the cantilever beam. Moreover, the commonly used method of connecting reinforcement at the lengthening position of the existing cantilever beam is welding, but the longitudinal reinforcement at the top of the existing cantilever beam is often arranged in two or three layers, and the operable surface of the multi-layer reinforcement welding is small, which makes the construction inconvenient. SUMMARY
[0004] The utility model aims at providing a cantilever beam lengthening structure of existing building, which solves the problems of difficulty in increasing the top reinforcement of the cantilever beam and inconvenience in multi-layer welding construction of the lengthened top reinforcement.
[0005] To achieve the above object, the utility model provides a kind of existing cantilever beam lengthening structure including original wall column, original cantilever beam and new cantilever beam, the new cantilever beam is fixedly connected with the original wall column and the original cantilever beam, the original cantilever beam includes original beam top bar, original beam waist bar, original beam bottom bar and original beam stirrup, the new cantilever beam includes new top bar, new bottom bar, new waist bar and new stirrup, the new top bar is fixedly connected with the original beam top bar, the new bottom bar is fixedly connected with original wall column, and is implanted into the original wall column, the new waist bar has multiple, and is respectively fixedly connected with the original beam waist bar and the original beam bottom bar, the new stirrup is fixedly connected with the original beam stirrup, by being provided with the new bottom bar, the new waist bar and the new stirrup in the lower side of the original cantilever beam, the flexural capacity of beam is improved, the original beam top bar of the original cantilever beam can satisfy the new stress requirement of building, without additional increase, avoid the problem of the original beam top bar of the original cantilever beam increase, guarantee the safety of cantilever beam.In the junction of the original cantilever beam and the new cantilever beam, the new top bar, the new waist bar are connected with the original beam top bar, the original beam waist bar and the original beam bottom bar of the original cantilever beam in the mode of welding, force transmission is reliable, while new cantilever beam increases the beam height of the junction of original cantilever beam and lengthening section, reduces the new top bar required for calculation, new top bar only needs single layer to be set and is welded with the original beam top bar of original cantilever beam, the structure principle is clear, connection is reliable, construction is convenient, and practicality is strong, to solve the problem of existing cantilever beam top bar increase difficulty, top bar lengthening multilayer welding construction inconvenience.
[0006] Among them, the new waist bar has beam lengthening section waist bar and beam heightening section waist bar, the beam lengthening section waist bar is fixedly connected with the original beam waist bar and the original beam bottom bar;The beam heightening section waist bar is fixedly connected with the original wall column, and is implanted into the original wall column.
[0007] Among them, the new stirrup has beam heightening section stirrup and beam lengthening section stirrup, the beam heightening section stirrup is fixedly connected with the original beam stirrup, and is tied and connected with the beam heightening section waist bar and the new bottom bar;The beam lengthening section stirrup is tied and connected with the new top bar, the new waist bar and the new bottom bar.
[0008] Among them, the new cantilever beam further includes shear reinforcement, and the shear reinforcement is fixedly connected with the original wall column and implanted into the original wall column.
[0009] Among them, the new and old concrete bonding surface between the new cantilever beam and the original cantilever beam and the original wall column is chiseled.
[0010] The utility model discloses a kind of cantilever beam lengthening structure including original wall column, original cantilever beam and new cantilever beam, the new cantilever beam is fixedly connected with the original wall column and the original cantilever beam, the original cantilever beam includes original beam top tendon, original beam waist tendon, original beam bottom tendon and original beam stirrup, the new cantilever beam includes new top tendon, new bottom tendon, new waist tendon and new stirrup, the new waist tendon has beam lengthening section waist tendon and beam heightening section waist tendon, the new stirrup has beam heightening section stirrup and beam lengthening section stirrup, the new cantilever beam further includes shear reinforcement, the new top tendon is fixedly connected with the original beam top tendon, the new bottom tendon is fixedly connected with original wall column, and is implanted into the original wall column, the new waist tendon has multiple, and is fixedly connected with the original beam waist tendon and the original beam bottom tendon respectively, the new stirrup is fixedly connected with the original beam stirrup, by being provided with the new bottom tendon, the new waist tendon and the new stirrup in the original cantilever beam lower side, the flexural capacity of beam is improved, the original beam top tendon of the original cantilever beam can satisfy the new stress requirement of building, need not extra increase, avoid the original cantilever beam original beam top tendon increase difficult problem, guarantee the safety of cantilever beam, at the junction of the original cantilever beam and the new cantilever beam, the new top tendon, the new waist tendon are connected with the original beam top tendon, the original beam waist tendon and original beam bottom tendon of the original cantilever beam in the mode of welding, force transmission is reliable, simultaneously, the new cantilever beam passes through setting a horizontal section, increases the beam height of the junction of the original cantilever beam and lengthening section, reduces the new top tendon required for calculation, the new top tendon only needs single layer setting and is welded with the original beam top tendon of original cantilever beam, and the new cantilever beam sets an inclined section, under the premise of satisfying stress requirement, the cross section of cantilever beam is optimized, the amount of concrete is reduced, the available space under beam is increased, the structure principle is clear, connection is reliable, construction is convenient, and practicality is strong, so as to solve the difficulty of original cantilever beam top tendon increase, top tendon lengthening multilayer welding construction inconvenience problem. BRIEF DESCRIPTION OF DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description.
[0012] Figure 1 It is the overall structure schematic diagram of the first embodiment of the utility model cantilever beam lengthening structure.
[0013] Figure 2 It is the original beam stirrup and beam heightening section stirrup connection schematic diagram of the first embodiment of the utility model cantilever beam lengthening structure.
[0014] In the figure: 101-original wall column, 102-original cantilever beam, 103-new cantilever beam, 104-original beam top reinforcement, 105-original beam waist reinforcement, 106-original beam bottom reinforcement, 107-original beam stirrup, 108-new top reinforcement, 109-new bottom reinforcement, 110-new waist reinforcement, 111-new stirrup, 112-beam lengthening section waist reinforcement, 113-beam heightening section waist reinforcement, 114-beam heightening section stirrup, 115-beam lengthening section stirrup, 116-shear reinforcement. DETAILED DESCRIPTION
[0015] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, the embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0016] The first embodiment of the present application is:
[0017] Please refer to Figure 1 and Figure 2 , Figure 1 is the overall structure diagram of the existing cantilever beam lengthening structure of the first embodiment of the present application, Figure 2 is the original beam stirrup and beam heightening section stirrup connection schematic diagram of the existing cantilever beam lengthening structure of the first embodiment of the present application, the existing cantilever beam lengthening structure comprises an original wall column 101, an original cantilever beam 102 and a new cantilever beam 103, the original cantilever beam 102 comprises an original beam top reinforcement 104, an original beam waist reinforcement 105, an original beam bottom reinforcement 106 and an original beam stirrup 107, the new cantilever beam 103 comprises a new top reinforcement 108, a new bottom reinforcement 109, a new waist reinforcement 110 and a new stirrup 111, the new waist reinforcement 110 has a beam lengthening section waist reinforcement 112 and a beam heightening section waist reinforcement 113, the new stirrup 111 has a beam heightening section stirrup 114 and a beam lengthening section stirrup 115, the above-mentioned scheme solves the problems of difficulty in increasing the top reinforcement of the existing cantilever beam and inconvenience of multilayer welding construction of the top reinforcement lengthening.
[0018] For this specific embodiment, the original cantilever beam 102 edge and bottom are connected with the new cantilever beam 103, which is composed of a horizontal section and an inclined section, and is internally provided with the new top bar 108, the new bottom bar 109, the new waist bar 110 and the new stirrup 111. The new top bar 108 is only single-layered and is single-sided welded with the original beam top bar 104. The new bottom bar 109 is in the shape of a broken line and is implanted into the original wall column 101. The beam heightening section stirrup 114 is single-sided welded with the original beam stirrup 107 or implanted into the original cantilever beam 102. The beam lengthening section stirrup 115 is bound and connected with the new top bar 108, the new bottom bar 109, the beam heightening section waist bar 113 and the beam lengthening section waist bar 112. The beam heightening section waist bar 113 is implanted into the original wall column 101. The beam lengthening section waist bar 112 is single-sided welded with the original beam bottom bar 106 and the original beam waist bar 105. The shear steel bar 116 is arranged at the joint between the new cantilever beam 103 and the original wall column 101, is implanted into the original wall column 101 for half of it and is exposed for the other half, so as to ensure that the new cantilever beam 103 effectively transmits the shear force to the original wall column 101. The new and old concrete joint surfaces between the new cantilever beam 103 and the original cantilever beam 102 are all chiseled, and together form a new cantilever beam for bearing the structural load, thereby solving the problems of difficulty in increasing the top bar of the existing cantilever beam and inconvenience in multi-layer welding construction of the top bar lengthening.
[0019] Firstly, the new cantilever beam 103 is fixedly connected with the original wall column 101 and the original cantilever beam 102, the new top bar 108 is fixedly connected with the original beam top bar 104, the new bottom bar 109 is fixedly connected with the original wall column 101 and is implanted into the original wall column 101, the new bottom bar 109, the new waist bar 110 and the new stirrup 111 arranged on the lower side of the original cantilever beam 102 improve the bending bearing capacity of the beam, so that the original beam top bar 104 of the original cantilever beam 102 can meet the new stress requirement of the building without additional increase, avoiding the problem of increasing the original beam top bar 104 of the original cantilever beam 102, ensuring the safety of the cantilever beam, at the joint of the original cantilever beam 102 and the new cantilever beam 103, the new top bar 108 and the beam lengthening section waist bar 112 are connected with the original beam top bar 104, the original beam waist bar 105 and the original beam bottom bar 106 of the original cantilever beam 102 in a welding manner, the force transmission is reliable, at the same time, the new cantilever beam 103 is provided with a horizontal section, the beam height of the joint of the original cantilever beam 102 and the lengthening section is increased, the new top bar 108 needed for calculation is reduced, the new top bar 108 only needs to be arranged in a single layer and welded with the original beam top bar 104 of the original cantilever beam 102, and the new cantilever beam 103 is provided with an inclined section, under the premise of meeting the stress requirement, the cross section of the cantilever beam is optimized, the amount of concrete is reduced, the available space under the beam is increased, the structure principle is clear, the connection is reliable, the construction is convenient, and the practicality is strong, thereby solving the problems of difficulty in increasing the top bar of the existing cantilever beam, and inconvenience in multi-layer welding construction of the top bar lengthening.
[0020] Wherein, the beam lengthening section waist bar 112 is fixedly connected with the original beam waist bar 105 and the original beam bottom bar 106; the beam heightening section waist bar 113 is fixedly connected with the original wall column 101, the beam heightening section waist bar 113 is implanted into the original wall column 101, and the beam lengthening section waist bar 112 is single-sided welded with the original beam bottom bar 106 and the original beam waist bar 105.
[0021] Secondly, the beam heightening section stirrup 114 is fixedly connected with the original beam stirrup 107 and is bound and connected with the beam heightening section waist bar 113 and the new bottom bar 109; the beam lengthening section stirrup 115 is bound and connected with the new top bar 108, the new waist bar 110 and the new bottom bar 109.
[0022] Then, the shear steel bar 116 is fixedly connected with the original wall column 101, the shear steel bar 116 is arranged at the joint of the new cantilever beam 103 and the original wall column 101, is implanted into the original wall column 101 by half, and is exposed by half, so as to ensure that the new cantilever beam 103 effectively transmits the shear force to the original wall column 101.
[0023] Finally, the new and old concrete joint surfaces between the new cantilever beam 103 and the original cantilever beam 102 and the original wall column 101 are chiseled, and the new cantilever beam 103 and the original cantilever beam 102 form a new cantilever beam together to bear the structural load.
[0024] When the existing cantilever beam lengthening structure of the embodiment is used, the flexural bearing capacity of the beam is improved by providing the new bottom reinforcement 109, the new waist reinforcement 110 and the new stirrup 111 under the original cantilever beam 102, so that the original beam top reinforcement 104 of the original cantilever beam 102 can meet the new stress requirements of the building without additional increase, avoiding the problem of increasing the original beam top reinforcement 104 of the original cantilever beam 102, ensuring the safety of the cantilever beam. At the joint of the original cantilever beam 102 and the new cantilever beam 103, the new top reinforcement 108 and the beam lengthening section waist reinforcement 112 are connected to the original beam top reinforcement 104, the original beam waist reinforcement 105 and the original beam bottom reinforcement 106 of the original cantilever beam 102 by welding, and the force transmission is reliable. At the same time, the new cantilever beam 103 is provided with a horizontal section, which increases the beam height at the joint of the original cantilever beam 102 and the lengthening section, reduces the need for new top reinforcement 108 in calculation, and only needs to be provided with a single layer and welded with the original beam top reinforcement 104 of the original cantilever beam 102. The new cantilever beam 103 is provided with an inclined section, which optimizes the cross section of the cantilever beam under the premise of meeting the stress requirements, reduces the amount of concrete, increases the available space under the beam, and the shear reinforcement 116 is arranged at the joint of the new cantilever beam 103 and the original wall column 101, half of which is implanted into the original wall column 101 and half of which is exposed, so as to ensure that the new cantilever beam 103 effectively transmits shear force to the original wall column 101. The new and old concrete joint surfaces between the new cantilever beam 103 and the original cantilever beam 102 are chiseled, and a new cantilever beam is formed together to bear the structural load. The structure principle is clear, the connection is reliable, the construction is convenient, and the practicality is strong, thereby solving the problems of difficulty in increasing the top reinforcement of the existing cantilever beam and inconvenience in multi-layer welding construction of the top reinforcement lengthening.
[0025] The above only discloses one or more preferred embodiments of the application, which cannot limit the scope of the application. Those skilled in the art can understand that the implementation of all or part of the above embodiments is within the scope of the application.
Claims
1. An existing cantilever beam extension structure, including the original wall column, characterized in that: This also includes both the original cantilever beams and the newly added cantilever beams; The newly added cantilever beam is fixedly connected to the original wall column and the original cantilever beam. The original cantilever beam includes the original beam top reinforcement, original beam web reinforcement, original beam bottom reinforcement and original beam stirrups. The newly added cantilever beam includes newly added top reinforcement, newly added bottom reinforcement, newly added web reinforcement and newly added stirrups. The newly added top reinforcement is fixedly connected to the original beam top reinforcement. The newly added bottom reinforcement is fixedly connected to the original wall column and embedded in the original wall column. The newly added web reinforcement has multiple strands and is fixedly connected to the original beam web reinforcement and the original beam bottom reinforcement respectively. The newly added stirrups are fixedly connected to the original beam stirrups.
2. The existing cantilever beam extension structure as described in claim 1, characterized in that: The newly added reinforcing bars include beam extension section reinforcing bars and beam heightening section reinforcing bars. The beam extension section reinforcing bars are fixedly connected to the original beam reinforcing bars and the original beam bottom reinforcing bars. The beam heightening section reinforcing bars are fixedly connected to the original wall column and are embedded in the original wall column.
3. The existing cantilever beam extension structure as described in claim 2, characterized in that: The newly added stirrups include stirrups for the beam heightening section and stirrups for the beam extension section. The stirrups for the beam heightening section are fixedly connected to the original beam stirrups and tied to the web reinforcement of the beam heightening section and the newly added bottom reinforcement. The stirrups for the beam extension section are tied to the newly added top reinforcement, the newly added web reinforcement and the newly added bottom reinforcement.
4. The existing cantilever beam extension structure as described in claim 2, characterized in that: The newly added cantilever beam also includes shear reinforcement bars, which are fixedly connected to the original wall column and embedded in the original wall column.
5. The existing cantilever beam extension structure as described in claim 1, characterized in that: The interfaces between the new cantilever beam and the original cantilever beam and the original wall column are all roughened.