Embedded column base node connecting structure of steel pipe UHPC (Ultra High Performance Concrete) combination column

Abstract

The utility model provides a steel pipe UHPC combination column embedded type column base node connecting structure which comprises a foundation and a steel pipe combination column, the steel pipe combination column comprises a steel pipe, a plurality of sets of longitudinal steel bars arranged around the steel pipe and column concrete poured on the periphery of the steel pipe, a reserved groove with an upward opening is formed in the upper end of the foundation, and a connecting column is fixedly arranged at the bottom of the reserved groove. An annular space is formed between the reserved groove and the connecting column, a plurality of groups of anchor bolts are pre-buried in the connecting column, the upper end of the connecting column is fixedly connected with a positioning anchor backing plate through the anchor bolts, the steel pipe and the longitudinal steel bar of the steel pipe combination column are provided with exposed ends located in the reserved groove, and a steel pipe backing plate is welded to the exposed ends of the steel pipe. The steel pipe combination column is embedded in the preformed groove and fixed through the anchor bolt, the procedure that in a foundation, when connecting ribs are embedded firstly and lever combination columns are installed, the steel pipe combination column and longitudinal steel bars are welded is replaced, meanwhile, the exposed part of the steel pipe combination column is flush with the top of the foundation, joint formwork erecting is avoided, the steel use amount and the field welding amount can be greatly reduced, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fabricated engineering construction, in particular to a steel pipe UHPC combined column embedded column foot node connecting structure. BACKGROUND

[0002] With the continuous development of economy, building construction is facing challenges such as tight construction period and high cost. Steel pipe concrete combined columns have been widely used in high-rise buildings because of their high strength, good seismic performance and convenient construction characteristics. As the key structure connecting the upper structure and the foundation, the column foot node bears the axial force, shear force and bending moment of the bottom column to the foundation, thereby ensuring the bearing capacity and stiffness of the structure. Common column foot forms include embedded and end-bearing types. The embedded column foot extends into the interior of the foundation, providing vertical and lateral support through the reinforced concrete in the foundation, with large bearing capacity and stiffness, and can effectively dissipate energy. Under the premise of meeting the embedding depth requirement, the embedded column foot can be used as a rigid joint column foot and is widely used in multi-story and super high-rise buildings.

[0003] The embedded column foot faces certain challenges during construction, requiring the cutting and reconnection of steel bars, and the steel pipe surface of the embedded section usually needs to be provided with studs to enhance the bonding force with the external concrete, which not only increases the use of steel materials, but also requires more welding work, thereby affecting the construction period. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a steel pipe UHPC combined column embedded column foot node connecting structure, aiming to solve the problem of the need for cutting and reconnection of steel bars in the prior art, and the need for studs on the surface of the embedded section of the steel pipe to enhance the bonding force with the external concrete, increasing the use of steel materials and the amount of welding work.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a steel pipe UHPC combined column embedded column foot node connecting structure, comprising a foundation and a steel pipe combined column, the steel pipe combined column comprising a steel pipe, a plurality of longitudinal steel bars arranged around the steel pipe, and column concrete poured around the steel pipe, the foundation being provided with a reserved slot with an opening facing upwards at the upper end, the bottom of the reserved slot being fixedly provided with a connecting column, there being an annular space between the reserved slot and the connecting column, a plurality of anchor bolts being embedded in the connecting column, a positioning anchor pad being fixed to the upper end of the connecting column by the anchor bolts, the steel pipe and the longitudinal steel bars of the steel pipe combined column having exposed ends inside the reserved slot, the exposed end of the steel pipe being welded with a steel pipe pad, the steel pipe pad and the positioning anchor pad being fixed by a threaded connection structure, the side surface of the positioning anchor pad having a U-shaped hole, the exposed end of the longitudinal steel bar having a bending structure for passing through the corresponding U-shaped hole from top to bottom and being arranged in the annular space, and UHPC concrete being poured in the reserved slot after the installation of the steel pipe combined column.

[0006] Preferably, the exposed ends of the longitudinal reinforcing bars are tied with stirrups.

[0007] Preferably, the exposed ends of the steel pipes and longitudinal reinforcing bars in the steel-concrete composite column have the same depth as the reserved groove.

[0008] Preferably, the inside of the steel pipe is filled with column concrete.

[0009] Preferably, the height of the connecting column is not higher than the reserved groove.

[0010] Preferably, the bent structure is an L-shaped steel bar composed of a longitudinal arm and a transverse arm, with the longitudinal arm and the longitudinal steel bar fixedly arranged coaxially.

[0011] Preferably, both the steel pipe pad and the positioning anchor plate have round holes corresponding to the anchor bolts, and the anchor bolts pass through the round holes. The threaded connection structure includes a connecting thread provided on the upper end of the anchor bolt, and also includes a nut that mates with the connecting thread.

[0012] The beneficial effects of this utility model are:

[0013] 1. In use, this utility model involves passing the bent structure of the exposed end of the longitudinal reinforcement through a U-shaped hole into the annular space, and then fixing it with nuts through the round holes on the steel pipe pad using anchor bolts. This positions and installs the steel pipe composite column. UHPC concrete is then poured into the reserved groove, and the steel pipe composite column is embedded in the reserved groove and fixed with anchor bolts. This replaces the previous process of pre-embedding connecting bars in the foundation and then welding them to the longitudinal reinforcement when installing the lever composite column. At the same time, the exposed part of the steel pipe composite column is flush with the top of the foundation, avoiding the need for joint formwork. This significantly reduces the amount of steel used and the amount of on-site welding, and improves construction efficiency.

[0014] 2. When using this utility model, by pouring UHPC concrete, the bonding strength between UHPC and steel pipe is better, which can compensate for the bonding effect of studs and ring reinforcement on the outer wall interface of steel pipe and greatly reduce the amount of steel used. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure after removing the UHPC concrete in a specific embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the connecting column and anchor bolt in a specific embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the circular hole in a specific embodiment of this utility model;

[0019] Figure 5 This is a frontal cross-sectional structural diagram of a specific embodiment of this utility model.

[0020] In the diagram: 1. UHPC concrete; 2. Steel pipe; 3. Longitudinal reinforcement; 4. Stirrups; 5. Steel pipe pad; 6. Positioning anchor plate; 7. Anchor bolt; 8. Nut; 9. Connecting column; 10. Circular hole; 11. Foundation; 12. Reserved groove. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0022] like Figures 1-5 As shown, a steel pipe UHPC composite column embedded column base node connection structure includes a foundation 11 and a steel pipe composite column. The steel pipe composite column includes a steel pipe 2, multiple sets of longitudinal reinforcing bars 3 arranged around the steel pipe 2, and column concrete poured around the steel pipe 2. The upper end of the foundation 11 is provided with a reserved groove 12 with its opening facing upward. A connecting column 9 is fixedly installed at the bottom of the reserved groove 12. There is an annular space between the reserved groove 12 and the connecting column 9. Multiple sets of anchor bolts 7 are pre-embedded inside the connecting column 9. The upper end of the connecting column 9 is connected by the anchor bolts 7. The steel pipe 2 and longitudinal reinforcing bar 3 of the steel pipe composite column are fixed with positioning anchor plate 6. They have exposed ends located inside the reserved groove 12. The exposed ends of the steel pipe 2 are welded with steel pipe pad 5. The steel pipe pad 5 and the positioning anchor plate 6 are fixed by a threaded connection structure. The side of the positioning anchor plate 6 has a U-shaped hole. The exposed ends of the longitudinal reinforcing bars 3 have a bending structure for passing through the corresponding U-shaped hole from top to bottom and being arranged in the annular space. After the steel pipe composite column is installed in the reserved groove 12, UHPC concrete 1 is poured.

[0023] In this embodiment, when installing the steel pipe composite column, the position of the steel pipe composite column is adjusted so that the bent structure at the lower end of the longitudinal reinforcing bar 3 corresponds to the U-shaped hole on the positioning anchor plate 6 and the round hole 10 of the steel pipe pad 5 corresponds to the anchor bolt 7 before being lowered. The bent structure of the longitudinal reinforcing bar 3 passes through the U-shaped hole to quickly position the steel pipe composite column. The anchor bolt 7 passes through the round hole 10 on the steel pipe pad 5 and is fixed by the nut 8, so that the steel pipe pad 5 and the positioning anchor plate 6 are fixedly connected, thereby fixing the steel pipe composite column. After that, UHPC concrete 1 is poured into the reserved groove 12. The bonding strength between UHPC and steel pipe 2 is higher. With the bending structure, the amount of reinforcing bar used can be reduced to a greater extent, thus reducing construction costs.

[0024] like Figure 2 As shown, the exposed ends of the longitudinal steel bars 3 are tied with stirrups 4.

[0025] In this embodiment, after the steel pipe pad 5 and the positioning anchor plate 6 are connected by high-strength nuts 8, the stirrups 4 are tied to provide additional shear bearing capacity and prevent the component from shearing failure.

[0026] like Figure 3 As shown, the exposed ends of the steel pipe 2 and longitudinal reinforcement 3 of the steel-concrete composite column are at the same depth as the reserved groove 12.

[0027] In this embodiment, UHPC concrete 1 is poured into the exposed ends of the steel pipe 2 and longitudinal reinforcing bars 3 in the reserved groove 12 to improve the strength, durability and stability of the connection between the steel pipe and the foundation 11, enhance the load-bearing capacity of the entire structure, and improve the bonding strength between UHPC and steel pipe 2, which can compensate for the bonding effect of studs and ring bars on the outer wall interface of steel pipe 2.

[0028] like Figure 3 As shown, the interior of steel pipe 2 is filled with column concrete.

[0029] In this embodiment, the steel pipe 2 is filled with concrete to enhance the bearing capacity of the concrete column of the steel pipe 2.

[0030] like Figure 5 As shown, the height of the connecting column 9 is not higher than the reserved slot 12.

[0031] In this embodiment, the height of the connecting column 9 is lower than the opening of the reserved groove 12, so that the exposed end of the steel-concrete composite column can fully contact the UHPC concrete 1, thereby improving the bonding force and enhancing the stability of the steel-concrete composite column.

[0032] like Figure 4 As shown, the bent structure is an L-shaped steel bar composed of a longitudinal arm and a transverse arm, with the longitudinal arm and the longitudinal steel bar 3 fixedly installed coaxially.

[0033] In this embodiment, the bent structure can also be a 90° bent steel bar member, one end of which is welded to the longitudinal steel bar 3.

[0034] like Figure 4 As shown, both the steel pipe pad 5 and the positioning anchor plate 6 have round holes 10 corresponding to the anchor bolts 7, and the anchor bolts 7 pass through the round holes 10. The threaded connection structure includes a connecting thread provided on the upper end of the anchor bolt 7, and also includes a nut that mates with the connecting thread.

[0035] In this embodiment, the anchor bolt 7 passes through the round hole 10 on the steel pipe pad 5 and is fixed by the nut 8, so that the steel pipe pad 5 and the positioning anchor plate 6 are fixedly connected, thereby fixing the steel pipe composite column.

[0036] Working principle: When producing precast steel pipe composite columns in the factory, only the section of the steel pipe composite column above the reserved groove 12 is formworked and UHPC concrete 1 is poured, exposing the longitudinal reinforcing bars 3 and steel pipes 2 at the bottom of the precast composite column, and welding steel pipe pads 5. When installing the steel pipe composite column, the steel pipe composite column is hoisted to the reserved groove 12 using hoisting equipment, the exposed ends of the longitudinal reinforcing bars are bent at 90°, and the position of the steel pipe composite column is adjusted so that the 90° bend of the exposed ends of the longitudinal reinforcing bars 3 corresponds to the U-shaped hole on the positioning anchor plate 6 and the circle of the steel pipe pad 5. After the anchor bolt 7 is lowered into the hole 10, the 90° bend of the exposed end of the longitudinal steel bar 3 passes through the U-shaped hole, thereby quickly positioning the steel pipe composite column. The anchor bolt 7 passes through the round hole 10 on the steel pipe pad 5 and is fixed by the nut 8, so that the steel pipe pad 5 and the positioning anchor plate 6 are fixedly connected, thereby fixing the steel pipe composite column. After that, UHPC concrete 1 is poured into the reserved groove 12. The bonding strength between UHPC and steel pipe 2 is higher, and the bending structure can reduce the amount of steel bars used to a greater extent, thus reducing construction costs.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steel pipe UHPC composite column embedded column base node connection structure, comprising a foundation (11) and a steel pipe composite column, the steel pipe composite column comprising a steel pipe (2), multiple sets of longitudinal reinforcing bars (3) arranged around the steel pipe (2), and column concrete poured around the steel pipe (2), characterized in that, The foundation (11) has an upward-facing reserved groove (12) at the top. A connecting column (9) is fixedly installed at the bottom of the reserved groove (12). There is an annular space between the reserved groove (12) and the connecting column (9). Multiple sets of anchor bolts (7) are pre-embedded inside the connecting column (9). The upper end of the connecting column (9) is fixedly connected to a positioning anchor plate (6) through the anchor bolts (7). The steel pipe (2) and longitudinal steel bar (3) of the steel pipe composite column have exposed ends located inside the reserved groove (12). The exposed end of the steel pipe (2) is welded with a steel pipe pad (5). The steel pipe pad (5) and the positioning anchor plate (6) are fixed by a threaded connection structure. The side of the positioning anchor plate (6) has a U-shaped hole (13). The exposed end of the longitudinal steel bar (3) has a bending structure for passing through the corresponding U-shaped hole (13) from top to bottom and being arranged in the annular space. After the steel pipe composite column is installed in the reserved groove (12), UHPC concrete (1) is poured.

2. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, The exposed ends of the longitudinal steel bars (3) are tied with stirrups (4).

3. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, The exposed ends of the steel pipe (2) and longitudinal reinforcement (3) of the steel pipe concrete column are at the same depth as the reserved groove (12).

4. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, The steel pipe (2) is filled with column concrete.

5. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, The height of the connecting column (9) is not higher than the reserved groove (12).

6. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, The bent structure is an L-shaped steel bar composed of a longitudinal arm and a transverse arm, with the longitudinal arm and the longitudinal steel bar (3) fixedly set on the same axis.

7. The embedded column base node connection structure of a steel pipe UHPC composite column according to claim 1, characterized in that, Both the steel pipe pad (5) and the positioning anchor plate (6) have round holes (10) corresponding to the anchor bolt (7), and the anchor bolt (7) passes through the round holes (10). The threaded connection structure includes a connecting thread set on the upper end of the anchor bolt (7) and a nut that mates with the connecting thread.

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