Conversion steel beam upper chord structure for converting reinforced concrete column

Abstract

The utility model belongs to the technical field of engineering construction, and particularly relates to a conversion steel beam upper chord structure for converting a reinforced concrete column, the conversion steel beam upper chord structure comprises a midspan conversion node and a support conversion node, the midspan conversion node comprises a U-shaped steel member and a midspan reinforced concrete column connected to the midspan position of the U-shaped steel member; the U-shaped steel component is filled with concrete and provided with distributed steel bars, a first column longitudinal bar of the midspan reinforced concrete column extends into the U-shaped steel component to be bent and anchored, the support conversion joint comprises a steel pipe concrete column and a support reinforced concrete column, an inner ring plate is arranged in the steel pipe concrete column, and a through ring plate is arranged on the top face of the steel pipe concrete column. The radial width of the through annular plate is larger than 0.7 time of the width of the U-shaped steel component, a second column longitudinal bar of the support reinforced concrete column extends into the steel pipe concrete column through the through annular plate to be bent and anchored, and the through annular plate and the steel pipe concrete column are both connected with the end of the U-shaped steel component. The structure is clear in stress, good in integrity and node bearing capacity and high in economical efficiency and construction operability.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering construction, and in particular relates to a conversion steel beam upper chord structure used for converting reinforced concrete columns. Background Art

[0002] Due to the demand for functional use, the bottom of the building needs an open space, and the upper part is an ordinary bay, which leads to the need to use a large-span structure with a large column spacing at the bottom and a structure with an ordinary column spacing at the upper part. Because the concrete structure is economical, comfortable to use, and has excellent anti-corrosion, fire resistance and durability, the upper ordinary column spacing often uses reinforced concrete structure. If the large-span structure is converted with conventional prestressed concrete or steel performance concrete, it will not only be huge in size and difficult to accept in the building, but also heavy, which is extremely unfavorable for the seismic resistance of the structure. At the same time, the stress is complex, and it is difficult for concrete components to meet the design requirements of complex stress states. The construction is difficult and it is difficult to ensure the construction quality; the lower large-span structure has a large span and complex stress, so it is preferred to use a steel structure with good stress performance, excellent seismic resistance, light weight and high strength, and the same cross-section can achieve a larger span space, or a steel tube concrete column + steel beam or steel truss structure. Therefore, there will be problems in connecting the lower steel beam or steel truss upper chord (steel truss is used in the form of a larger span) with the upper reinforced concrete column and connecting the lower steel tube concrete column with the upper reinforced concrete column.

[0003] The existing connection methods are mainly to extend the lower steel tube concrete column upward or to connect the steel beam directly with the upper concrete. The measures taken are basically to directly connect the upper concrete longitudinal reinforcement with the lower conversion steel beam. This method cannot achieve the direct transition of the larger steel tube column to the upper ordinary concrete column. The direct connection between the upper concrete and the steel beam makes the interface force unclear and the economy is not high. At the same time, due to the complex node connection, it will cause construction inconvenience and cannot guarantee the construction quality.

[0004] Therefore, we propose a conversion steel beam upper chord structure for converting reinforced concrete columns to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a conversion steel beam upper chord structure for converting reinforced concrete columns, which has clear force, good integrity, strong node bearing capacity, strong economy and strong construction operability.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A conversion steel beam upper chord structure for converting reinforced concrete columns, comprising a mid-span conversion node and a support conversion node, wherein the mid-span conversion node comprises a U-shaped steel member and a mid-span reinforced concrete column, wherein the U-shaped steel member is filled with concrete and distributed steel bars are arranged, wherein the mid-span reinforced concrete column is connected above the mid-span position of the U-shaped steel member, wherein the first column longitudinal reinforcement of the mid-span reinforced concrete column extends into the inner bending anchor of the U-shaped steel member, wherein the support conversion node is distributed at the end of the U-shaped steel member, wherein the support conversion node comprises a steel tube concrete column and a support reinforced concrete column, wherein an inner ring plate is provided inside the steel tube concrete column, wherein casting holes and air holes are provided on the inner ring plate, wherein a through ring plate is provided on the top surface of the steel tube concrete column, wherein the radial width of the through ring plate is greater than 0.7 times the width of the U-shaped steel member, wherein the through ring plate has a hole in the middle, wherein the second column longitudinal reinforcement of the support reinforced concrete column extends into the inner bending anchor of the steel tube concrete column through the hole, and wherein the through ring plate and the steel tube concrete column are both connected to the end of the U-shaped steel member.

[0008] In a further technical solution, the U-shaped steel member is closed at one end of the concrete-filled steel tube column with an upper flange plate to form a closed box-shaped steel, and concrete is filled inside. The through ring plate and the concrete-filled steel tube column are both connected to the closed box-shaped steel. The U-shaped steel member is provided with longitudinal stiffening ribs on both sides of the distribution steel bars. The longitudinal stiffening ribs and the distribution steel bars extend into the closed box-shaped steel with a length of at least 1 meter, and the distribution steel bars are welded to the upper flange plate on both sides with a length of at least 5 days.

[0009] In a further technical solution, the closed box-shaped steel is provided with a first transverse stiffening rib at the end of the upper flange plate.

[0010] In a further technical solution, the distribution steel bars include a plurality of upper structural steel bars and a plurality of U-shaped stirrups, the upper structural steel bars are longitudinally spaced apart in the U-shaped steel member, and the U-shaped stirrups are opened downwardly and staggeredly installed on the upper structural steel bars.

[0011] In a further technical solution, mid-span slabs are arranged at intervals at the upper opening of the U-shaped steel member to avoid the reinforced concrete columns.

[0012] In a further technical solution, studs are arranged inside the U-shaped steel member, and the transverse and longitudinal spacings of the studs are both no greater than 300 mm.

[0013] In a further technical solution, a transfer stiffening rib is provided between the inner ring plate and the through ring plate.

[0014] In a further technical solution, the connection between the U-shaped steel member and the steel tube concrete column adopts one or more of welding connection, bolt connection and embedded part connection.

[0015] In a further technical solution, the U-shaped steel member is one of a U-shaped outer steel beam and a steel truss.

[0016] In a further technical solution, the U-shaped steel member adopts the steel truss when the span is large. The steel truss includes a truss upper chord, a truss web and a truss lower chord which are connected up and down. The ends of the truss upper chord, the truss web and the truss lower chord are all connected to the steel tube concrete column. A second transverse stiffening rib is also arranged inside the truss upper chord at the intersection of the truss upper chord and the truss web.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. The utility model improves the integrity and bearing capacity of the mid-span conversion node and the support conversion node by pouring concrete and reinforcing the strength and rigidity of the plate, while avoiding the situation in which the conventional steel structure extends upward and the load bearing of the node is unclear, thereby effectively solving the problem of complex node connection in the prior art.

[0019] 2. The utility model adopts two types of steel, U-shaped outer steel beam or steel truss, as the conversion steel beam. According to different span requirements, the U-shaped outer steel beam or steel truss is used to connect with the steel tube concrete column. The cross-section of the upper chord of the U-shaped outer steel beam or steel truss is reasonably designed to ensure that a larger span space is provided under economic and reasonable conditions, make full use of the compressive properties of concrete and the tensile properties of steel, avoid overlapping between nodes, reduce the amount of steel components, and further improve economy.

[0020] 3. The steel components of the steel tube concrete columns and conversion steel beams in the structure of the utility model can be prefabricated in the factory according to the construction drawings and site conditions, and some are connected and formed on site to avoid complex node overlaps. The on-site construction process is simple and the construction operability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a side structural schematic diagram of the utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the mid-span conversion node of the utility model;

[0025] Figure 4 This is a schematic diagram of the internal structure of the closed box steel of the utility model;

[0026] Figure 5It is a side structural schematic diagram of another embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the U-shaped outer steel beam of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the second transverse stiffening rib of the utility model.

[0029] Figure numbers: A-mid-span conversion node, B-support conversion node, 1-mid-span reinforced concrete column, 2-first column longitudinal reinforcement, 3-steel tube concrete column, 4-support reinforced concrete column, 5-inner ring plate, 6-casting hole, 7-ventilation hole, 8-through ring plate, 9-second column longitudinal reinforcement, 10-closed box steel, 11-longitudinal stiffening rib, 12-first transverse stiffening rib, 13-upper structural steel bar, 14-U-shaped stirrups, 15-mid-span plate, 16-bolts, 17-transfer stiffening rib, 18-U-shaped outsourced steel beam, 19-steel truss, 1901-truss upper chord, 1902-truss web, 1903-truss lower chord, 20-second transverse stiffening rib. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Embodiment 1:

[0032] See also Figure 1 and Figure 2 This embodiment provides a conversion steel beam upper chord structure for converting reinforced concrete columns, including a mid-span conversion node A and a support conversion node B. The mid-span conversion node A includes a U-shaped steel member and a mid-span reinforced concrete column 1. Figure 6 Here, the U-shaped steel member adopts a U-shaped outer steel beam 18, see Figure 3 The U-shaped outer steel beam 18 is filled with concrete and distributed with steel bars. The mid-span reinforced concrete column 1 is connected above the mid-span position of the U-shaped outer steel beam 18. The first column longitudinal reinforcement 2 of the mid-span reinforced concrete column 1 extends into the inner bend anchor of the U-shaped outer steel beam 18. The support conversion node B is distributed at the end of the U-shaped outer steel beam 18. Figure 2The support conversion node B includes a steel tube concrete column 3 and a support reinforced concrete column 4. An inner ring plate 5 is provided inside the steel tube concrete column 3. A casting hole 6 and a vent hole 7 are opened on the inner ring plate 5. A through ring plate 8 is provided on the top surface of the steel tube concrete column 3. The radial width of the through ring plate 8 is 0.8 times the width of the U-shaped outer steel beam 18. The middle of the through ring plate 8 is opened. When pouring concrete, the second column longitudinal reinforcement 9 of the support reinforced concrete column 4 extends into the steel tube concrete column 3 through the hole and is bent and anchored. The through ring plate 8 and the steel tube concrete column 3 are both connected to the end of the U-shaped outer steel beam 18.

[0033] Specifically, the mid-span conversion node A is distributed at the mid-span position of the upper chord structure of the conversion steel beam, and the U-shaped outer steel beam 18 is filled with concrete and distributed steel bars are arranged, so as to be directly connected to the mid-span reinforced concrete column 1; the first column longitudinal reinforcement 2 of the mid-span reinforced concrete column 1 extends into the inner bend anchor of the U-shaped outer steel beam 18, and the column stirrups of the mid-span reinforced concrete column 1 are conventionally encrypted according to the specification, so that the integrity and bearing capacity of the mid-span conversion node A are improved; the support conversion node B is distributed at the support position of the upper chord structure of the conversion steel beam, and according to the position of the U-shaped outer steel beam 18, a through ring plate 8 and an inner ring plate 5 are arranged on the steel tube concrete column 3, and the second column longitudinal reinforcement 9 of the support reinforced concrete column 4 extends into the inner bend anchor of the steel tube concrete column 3 through the holes on the through ring plate 8, and the support The column stirrups of the seat reinforced concrete column 4 are conventionally encrypted according to the specifications, and the radial width of the through-ring plate 8 is set to 0.8 times the width of the U-shaped outer steel beam 18, which is greater than 0.7 times, effectively ensuring that the U-shaped outer steel beam 18 effectively transmits the force to the steel tube concrete column 3, and a casting hole 6 is set in the middle of the inner ring plate 5 to facilitate the concrete casting of the lower steel tube concrete column 3, and a vent hole 7 is provided to facilitate the discharge of air during concrete pouring; by through-casting concrete and reinforcing the strength and rigidity of the plate, the integrity and bearing capacity of the mid-span conversion node A and the support conversion node B are improved, while avoiding the situation in which the steel structure extends upward and the load-bearing capacity of the node is unclear, thereby effectively solving the problem of complex node connection in the prior art.

[0034] In this embodiment, see Figure 2 and Figure 4 The U-shaped outer steel beam 18 is close to one end of the steel tube concrete column 3 to close the upper flange plate to form a closed box steel 10, and concrete is filled inside. The through ring plate 8 and the steel tube concrete column 3 are welded to the closed box steel 10. The U-shaped outer steel beam 18 is provided with longitudinal stiffening ribs 11 on both sides of the distributed steel bars. The longitudinal stiffening ribs 11 and the distributed steel bars are extended into the closed box steel 10 with a length of 1 meter, and the distributed steel bars are double-sidedly welded to the upper flange plate with a length of 5d. The closed box steel 10 is provided with a first transverse stiffening rib 12 at the end of the upper flange plate.

[0035] Specifically, the upper flange plate is closed at one end of the U-shaped outer steel beam 18 near the steel tube concrete column 3 to form a closed box steel 10, that is, the support end, and the longitudinal stiffening rib 11 and the distribution steel bar are extended into the closed box steel 10 with a length of 1 meter, and the distribution steel bar is double-sidedly welded to the upper flange plate for a length of 5d. A first transverse stiffening rib 12 is also provided at the end of the upper flange plate, which effectively strengthens the strength of the transition node from the U-shaped outer steel beam 18 to the closed box steel 10, and adopts a reasonable upper chord cross-section design to ensure economical and reasonable conditions. Under the condition of providing a larger span space, this structure is vertical load controlled, the mid-span of the U-shaped outer steel beam 18 is a compression zone, and the filling concrete can be compressed at the same time as the steel components in the mid-span, reducing the amount of steel components. At the same time, in the tensile zone of the support, the upper flange plate of the U-shaped outer steel beam 18 is closed to form a closed box steel 10, which gives full play to the tensile performance of the tensile zone of the support, fully utilizes the compressive performance of concrete and the tensile performance of steel, and also avoids unnecessary overlap between nodes, reduces the amount of steel components, and further improves the economy. When the side wall height-to-thickness ratio of the closed box steel 10 is greater than 40, the side wall can be welded with studs 16 or transverse stiffening ribs to ensure the stability of the side wall, so as to ensure the quality and safety of the structure.

[0036] In this embodiment, see Figure 3 A mid-span plate 15 is arranged at the upper opening of the U-shaped outer steel beam 18 to avoid the reinforced concrete column, and studs 16 are arranged inside the U-shaped outer steel beam 18. The transverse and longitudinal spacings of the studs 16 are both 300 mm.

[0037] Specifically, by arranging the mid-span plates 15 and the bolts 16, the integrity of the U-shaped outer steel beam 18 and the inner concrete is strengthened to ensure the quality and safety of the structure.

[0038] In this embodiment, see Figure 3 The distribution steel bars include a plurality of upper structural steel bars 13 and a plurality of U-shaped stirrups 14. The upper structural steel bars 13 are longitudinally spaced apart in the U-shaped outer steel beam 18. The U-shaped stirrups 14 are opened downward and staggeredly installed on the upper structural steel bars 13.

[0039] Specifically, the specific quantity of the upper structural steel bars 13 and the U-shaped stirrups 14 needs to be determined according to the span, width and structural requirements of the U-shaped outer steel beam 18, and both need to meet the minimum reinforcement ratio and relevant structural requirements, thereby improving the integrity and bearing capacity of the mid-span transition node A to ensure the quality and safety of the structure.

[0040] It is worth mentioning that the steel components of the steel tube concrete column 3 and the conversion steel beam in the utility model can be prefabricated in the factory according to the construction drawings and site conditions, and partially welded on site, avoiding complex node overlaps, and the on-site construction process is simple and the construction operability is strong.

[0041] Embodiment 2:

[0042] Different from Example 1, in this embodiment, refer to Figure 5 The U-shaped steel member adopts a steel truss 19 to replace the U-shaped outer steel beam 18. The steel truss 19 includes a truss upper chord 1901, a truss web 1902 and a truss lower chord 1903 connected in an upper and lower manner. The ends of the truss upper chord 1901, the truss web 1902 and the truss lower chord 1903 are all welded to the steel tube concrete column 3. Figure 3 and Figure 7 A second transverse stiffening rib 20 is further provided inside the truss upper chord 1901 at the intersection of the truss upper chord 1901 and the truss web 1902 , and a transfer stiffening rib 17 is further provided between the inner ring plate 5 and the through ring plate 8 .

[0043] Specifically, a steel truss 19 is used to replace the U-shaped outer steel beam 18, so as to meet the use of the upper chord structure of the conversion steel beam with a larger span. The corresponding structure is reasonably selected according to the construction requirements, which can ensure that a larger span space is provided under economic and reasonable conditions, and has strong economy. A second transverse stiffening rib 20 is set at the intersection of the truss upper chord 1901 and the truss web 1902 to improve the integrity and bearing capacity of the mid-span conversion node A to ensure the quality and safety of the structure, and a transfer stiffening rib 17 is set between the inner ring plate 5 and the through ring plate 8 to effectively transfer the web force of the closed box steel 10.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A conversion steel beam upper chord structure for converting reinforced concrete columns, characterized in that: The invention comprises a mid-span conversion node (A) and a support conversion node (B), wherein the mid-span conversion node (A) comprises a U-shaped steel member and a mid-span reinforced concrete column (1), wherein the U-shaped steel member is filled with concrete and distributed with steel bars, wherein the mid-span reinforced concrete column (1) is connected above the mid-span position of the U-shaped steel member, wherein the first column longitudinal reinforcement (2) of the mid-span reinforced concrete column (1) extends into the U-shaped steel member for bending and anchoring, and the support conversion node (B) is distributed at the end of the U-shaped steel member, wherein the support conversion node (B) comprises a steel tube concrete column (3) and a support reinforced concrete column (4). ), an inner ring plate (5) is provided inside the steel tube concrete column (3), a casting hole (6) and a vent hole (7) are provided on the inner ring plate (5), a through ring plate (8) is provided on the top surface of the steel tube concrete column (3), the radial width of the through ring plate (8) is greater than 0.7 times the width of the U-shaped steel member, the middle of the through ring plate (8) is opened, the second column longitudinal reinforcement (9) of the support reinforced concrete column (4) extends into the steel tube concrete column (3) through the hole to bend and anchor, and the through ring plate (8) and the steel tube concrete column (3) are both connected to the end of the U-shaped steel member.

2. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 1, characterized in that: The U-shaped steel member has an upper flange plate at one end close to the steel tube concrete column (3) to form a closed box-shaped steel (10), and is filled with concrete. The through ring plate (8) and the steel tube concrete column (3) are both connected to the closed box-shaped steel (10). The U-shaped steel member has longitudinal stiffening ribs (11) on both sides of the distribution steel bars. The longitudinal stiffening ribs (11) and the distribution steel bars extend into the closed box-shaped steel (10) for a length of at least 1 meter, and the distribution steel bars are double-sidedly welded to the upper flange plate for a length of at least 5 days.

3. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 2, characterized in that: The closed box-shaped steel (10) is provided with a first transverse stiffening rib (12) at the end of the upper flange plate.

4. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 1, characterized in that: The distribution steel bars include a plurality of upper structural steel bars (13) and a plurality of U-shaped stirrups (14). The upper structural steel bars (13) are arranged in a longitudinally spaced manner in the U-shaped steel member. The U-shaped stirrups (14) are installed on the upper structural steel bars (13) in a staggered manner with their openings facing downward.

5. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 4, characterized in that: A mid-span slab (15) is arranged at intervals at the upper opening of the U-shaped steel member to avoid the reinforced concrete column.

6. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 1, characterized in that: Bolts (16) are arranged inside the U-shaped steel member, and the transverse and longitudinal spacings of the bolts (16) are both no greater than 300 mm.

7. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 1, characterized in that: A transfer stiffening rib (17) is provided between the inner ring plate (5) and the through ring plate (8).

8. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 1, characterized in that: The connection between the U-shaped steel member and the steel tube concrete column (3) is achieved by one or more of welding connection, bolt connection and embedded part connection.

9. A conversion steel beam upper chord structure for converting reinforced concrete columns according to any one of claims 1 to 8, characterized in that: The U-shaped steel member is one of a U-shaped outer steel beam (18) and a steel truss (19).

10. The conversion steel beam upper chord structure for converting reinforced concrete columns according to claim 9, characterized in that: The U-shaped steel member adopts the steel truss (19) when the span is large. The steel truss (19) includes a truss upper chord (1901), a truss web (1902) and a truss lower chord (1903) connected in an upper and lower manner. The ends of the truss upper chord (1901), the truss web (1902) and the truss lower chord (1903) are all connected to the steel tube concrete column (3). The interior of the truss upper chord (1901) is also provided with a second transverse stiffening rib (20) at the intersection of the truss upper chord (1901) and the truss web (1902).

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