Steel connecting end prestressed concrete superposed beam
By pre-embedding steel and welding bolts at the end of the reinforced concrete stacked beam, combined with high-strength prestressed bottom bars, the problems of slow construction speed and large reinforcement volume of reinforced concrete stacked beams in the prior art are solved, and the effects of simplifying construction, improving crack resistance and reducing structural self-weight are achieved.
Patent Information
- Application Number
- CN202421441647.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-21
AI Technical Summary
During the construction process, existing reinforced concrete overlapping beams have problems such as excessive reinforcement number, temporary scaffolding required for construction and installation, and troublesome installation of column node stirrups, resulting in serious restrictions on the construction speed.
The steel connection end prestressed concrete overlapping beam is used. By pre-embedding steel and welding bolts at the end of the beam, combined with high-strength prestressed bottom ribs, the amount of reinforcement is reduced and the construction process is simplified to avoid the use of temporary scaffolding.
The amount of steel is reduced, the construction process is simplified, the crack resistance of the beam is improved, the structural self-weight is reduced, and the connection method of the beam end is basically consistent with the H-shaped steel beam, making it easy to install.
Smart Images
Figure CN222649209U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building components, in particular to a prestressed concrete composite beam with a steel connection end. Background Art
[0002] In the most widely used beamed floor slabs, the beams are the supports of the slabs, and the construction of the slabs is directly affected by the beams. The existing reinforced concrete composite beams use non-prestressed reinforced concrete composite beams, and the bottom reinforcement at the end of the beam is directly anchored in the column or beam. The disadvantages of this type of beam are: 1. The number of reinforcements is too large; 2. Construction and installation require the establishment of temporary scaffolding to support the composite beams, and the construction measures are expensive; 3. The beam reinforcement is directly anchored in the column, which makes it difficult to install the stirrups at the column node, increasing the construction cost, and thus seriously restricting the construction speed of the entire floor slab. Summary of the invention
[0003] In order to overcome at least one of the above problems, the utility model provides a simple and fast prestressed concrete composite beam with steel connection ends.
[0004] The technical solution adopted by the utility model to solve its technical problems is: a prestressed concrete composite beam with a steel connection end, the composite beam comprising a steel frame, concrete and a steel section arranged at the end of the composite beam, the steel frame being arranged in the concrete; one side of the steel section is embedded in the concrete, and the other side extends out of the outer end of the concrete; the steel section at least comprises a web, the web is longitudinally embedded in the concrete, and a plurality of first bolts are respectively arranged on both sides of the web, the first bolts extend to both sides and are perpendicular to the web; the steel section also comprises an upper flange plate and a lower flange plate, the upper flange plate and the lower flange plate are respectively fixed to the upper and lower ends of the steel section, and the upper flange plate and the lower flange plate are respectively arranged perpendicular to the web; the lower flange plate is provided with a plurality of second bolts, the second bolts extend upward and are perpendicular to the lower flange plate.
[0005] Preferably, a plurality of bolt holes are provided at the outer end of the web.
[0006] Preferably, the outer end of the web is longer than the lower flange plate and extends out from the outer end of the concrete.
[0007] Preferably, the lower flange plate is located on the bottom surface of the concrete and has the same width as the concrete.
[0008] Preferably, the steel skeleton comprises a plurality of transversely arranged frame-shaped stirrups and a plurality of stress-bearing steel bars, and the stress-bearing steel bars are connected to each frame-shaped stirrup so that the steel skeleton is integrated.
[0009] Preferably, the upper part of the frame-shaped stirrups protrudes out of the concrete to facilitate connection with the composite layer concrete.
[0010] Preferably, the lower flange plate is located at the bottom of the frame-shaped stirrups, the second bolt extends into the steel bar skeleton, and stress-bearing steel bars are respectively arranged on both sides of the second bolt.
[0011] Preferably, the concrete end is a tooth-shaped structure.
[0012] Preferably, reserved holes for stirrups are provided below the web, so that the frame-shaped stirrups at the ends can pass through the web to form a steel skeleton.
[0013] The beneficial effects of the utility model are as follows: a prestressed concrete composite beam with steel connection ends adopts a pre-buried steel structure, and the bottom reinforcement adopts prestressed steel bars, which reduces the amount of steel used; the steel combination at the beam end is convenient for connection with the connecting plate of the column, so that the connection method of the composite beam is basically the same as that of the H-shaped steel beam, and the installation does not require a temporary scaffold, which is simple and fast. High-strength prestressed bottom bars are adopted to reduce reinforced beams and improve the crack resistance of the beam. The pre-buried steel at the beam end and the bolts welded on the steel strengthen the connection between the steel and concrete and the overlap effect of the steel bars; the rigidity of the prestressed beam is large and the cross-section height is small, which reduces the deadweight of the structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0015] Figure 1 It is a schematic diagram of the overall structure of the prestressed concrete composite beam with steel connection ends described in the utility model;
[0016] Figure 2 It is a schematic diagram of the steel skeleton structure of the prestressed concrete composite beam with steel connection ends described in the utility model;
[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the prestressed concrete composite beam with steel connection ends described in the utility model;
[0018] Figure 4 It is a schematic diagram of the steel section combined structure of the prestressed concrete composite beam with steel connection end described in the utility model.
[0019] Description of the drawings: 1. steel frame, 11. frame stirrups, 12. stress-bearing steel bars, 2. concrete, 3. steel sections, 31. web, 311. bolt holes, 312. reserved holes for stirrups, 32. upper flange plate, 33. lower flange plate, 41. first bolt, 42. second bolt. DETAILED DESCRIPTION
[0020] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0021] Example
[0022] like Figure 1 , 2 The steel connection end prestressed concrete composite beam shown is composed of a steel skeleton 1, concrete 2, and steel sections 3. The steel skeleton 1 is cast in the concrete 2, and the steel sections 3 are cast at both ends of the concrete 2, and the steel sections 3 partially extend outside the end surface of the concrete 2.
[0023] See also Figure 3 , 4 During pouring, one side of the steel section 3 is embedded in the concrete 2, and the other side extends out of the outer end of the concrete 2. The steel section 3 has at least a web 31, and the web 31 is longitudinally embedded in the concrete 2. A plurality of first bolts 41 are respectively arranged on both sides of the web 31, and the first bolts 41 extend to both sides and are perpendicular to the web; thus, the embedding strength of the web 31 is strengthened.
[0024] See also Figure 3 , 4 The steel section 3 also includes an upper flange plate 32 and a lower flange plate 33, which are respectively fixed to the upper and lower ends of the steel section 3, and are respectively arranged perpendicularly to the web 31; the lower flange plate 33 is provided with a plurality of second bolts 42, which extend upward, and are perpendicular to the upper surface of 33; the thickness, length, width of the web 3, the upper flange plate 32, and the lower flange plate 33 and the number of the first bolts and the second bolts are all determined according to calculation.
[0025] See also Figure 4 The outer end of the web 31 is provided with a plurality of bolt holes 311. It is convenient to connect with the connecting plate of the column, so that the connection method of the composite beam is basically the same as that of the H-shaped steel beam, and the installation does not require temporary scaffolding, which is simple and fast.
[0026] This embodiment adopts high-strength prestressed bottom reinforcement, reduces reinforced beams, improves the crack resistance of the beams, pre-buries steel sections 3 at the beam ends and welds studs on the steel sections 3 .
[0027] In this embodiment, the outer end of the web plate 31 is longer than the lower flange plate 33 and extends out of the outer end of the concrete. Moreover, the outer end of the upper flange plate 32 is flush with the web plate 31 .
[0028] In this embodiment, the part of the steel section 3 embedded in the concrete 2 works together with the concrete 2. The embedded structure of the steel section 3 enhances the connection reliability of the beam end.
[0029] See also Figure 4, the lower flange plate 33 is located at the bottom of the concrete 2 and has the same width as the concrete 2. The lower flange plate 33 supports the bottom of the concrete 2 or is flush with the bottom of the concrete 2. The lower flange plate 33 extends backward, and the length of the rear end is longer than the web 31, and its length needs to meet the requirements of the overlap length with the steel bars. The width of the upper flange plate 32 is less than 1 / 2 of the width of the concrete 2 (and not less than 60 mm), and the length is consistent with the web 31.
[0030] See also Figure 2 The steel skeleton 1 includes a plurality of transversely arranged frame-shaped stirrups 11 and a plurality of stress-bearing steel bars 12. Each frame-shaped stirrup 11 is parallel to each other, and the stress-bearing steel bars 12 are connected to each frame-shaped stirrup 11, so that the steel skeleton 1 is integrated. The stress-bearing steel bars 12 are distributed at the edges of the frame-shaped stirrups 11 and are perpendicular to each frame-shaped stirrup 11. The upper part of the frame-shaped stirrup 11 extends out of the concrete, which is convenient for connecting with the concrete of the superimposed layer 2. In this embodiment, the frame-shaped stirrups 11 are densely distributed at the bottom of the frame-shaped stirrups 11 at the ends of the beam.
[0031] See also Figure 4 A stirrup reserved hole 312 is provided below the web 31 so that the frame-shaped stirrups 11 at the end can pass through the web 31 to form a steel skeleton.
[0032] The prestressed concrete composite beam with steel connection end described in the utility model adopts a steel embedded structure, which reduces the amount of steel used; the steel connection is convenient for connection with the connecting plate of the column, so that the connection method of the composite beam is consistent with that of the steel beam, and the installation does not require a temporary scaffold, which is simple and fast. High-strength prestressed bottom reinforcement is adopted to reduce the reinforced beam and improve the crack resistance of the beam. The beam end is embedded with steel and bolts are welded on the steel; the beam section height is small, which reduces the deadweight of the structure.
[0033] The manufacturing method of the prestressed concrete composite beam with steel connection end in the utility model:
[0034] 1) Use the pre-tensioning method to tension the prestressed steel bars as the bottom bars of the beam, install stirrups, etc., to make a steel skeleton;
[0035] 2) Install the prefabricated steel assembly at the beam end;
[0036] 3) The length, width, thickness and number of studs of the steel are determined by calculation; the lower flange plate is flush with the bottom of the beam and is the same width as the beam. The length of the lower flange plate is greater than 600mm, and studs are welded on the steel. The diameter of the studs should not be less than D19, the length is 80-100, and they are arranged on both sides of the full length of the steel, with a spacing of 100-150mm. The function of the studs is to transfer the force of the bottom reinforcement of the beam to the bottom plate, and then to the diaphragm in the column through the bottom plate;
[0037] 4) The length of the lower flange plate needs to meet the requirements of the lap length with the steel bars; when the stirrups are installed at the steel section, they should pass through the reserved stirrup holes at the bottom of the web, and the longitudinal steel bars should be placed inside the stirrups. The spacing of the stirrups at the beam end is 50-100mm, and the encrypted length is 1.5-2.0 times the beam height;
[0038] 4) After the concrete is poured and cured, the prestressed steel bars are stretched to form the concrete;
[0039] 5) The embedded end steel sections and concrete beams work together.
[0040] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A prestressed concrete composite beam with steel connection ends, characterized in that: The composite beam includes a steel frame, concrete and a steel section arranged at the end of the composite beam, the steel frame is arranged in the concrete; one side of the steel section is embedded in the concrete, and the other side extends out of the outer end of the concrete; the steel section includes at least one web, the web is longitudinally embedded in the concrete, and a plurality of first bolts are respectively arranged on both sides of the web, the first bolts extend to both sides and are perpendicular to the web; the steel section also includes an upper flange plate and a lower flange plate, the upper flange plate and the lower flange plate are respectively fixed to the upper and lower ends of the steel section, and the upper flange plate and the lower flange plate are respectively arranged perpendicular to the web; the lower flange plate is provided with a plurality of second bolts, the second bolts extend to the upper side and are perpendicular to the lower flange plate.
2. A prestressed concrete composite beam with steel connection ends according to claim 1, characterized in that: The outer end of the web is provided with a plurality of bolt holes.
3. The prestressed concrete composite beam with steel connection ends according to claim 1, characterized in that: The outer end of the web plate is longer than the lower flange plate and extends out from the outer end of the concrete.
4. The prestressed concrete composite beam with steel connection ends according to claim 3, characterized in that: The lower flange plate is located on the bottom surface of the concrete and has the same width as the concrete.
5. The prestressed concrete composite beam with steel connection ends according to claim 4, characterized in that: The steel frame includes a plurality of transversely arranged frame-shaped stirrups and a plurality of stress-bearing steel bars. The stress-bearing steel bars are connected to each frame-shaped stirrup so that the steel frame is integrated.
6. The prestressed concrete composite beam with steel connection ends according to claim 5, characterized in that: The upper part of the frame-shaped stirrups protrudes out of the concrete, so as to be connected with the concrete of the superimposed layer.
7. The prestressed concrete composite beam with steel connection ends according to claim 6, characterized in that: The lower flange plate is located at the bottom of the frame-shaped stirrups, the second bolt extends into the steel bar skeleton, and stress-bearing steel bars are respectively arranged on both sides of the second bolt.
8. The prestressed concrete composite beam with steel connection ends according to claim 7, characterized in that: The concrete end is a tooth-shaped structure.
9. The steel-connected prestressed concrete composite beam according to claim 5, characterized in that: Stirrup reserved holes are arranged below the web, so that the frame-shaped stirrups at the ends can pass through the web to form a steel bar skeleton.