CN-121989340-A - Forming device and method for horizontal two-dimensional directional steel fiber UHPC reinforced concrete column

Abstract

The invention provides a forming device and a forming method for a horizontal two-dimensional directional steel fiber UHPC reinforced concrete column, and relates to the technical field of reinforcement of existing concrete structures. The invention aims to solve the problems that the traditional concrete column has low bearing capacity, poor durability, short service life, and the existing directional technology can not reinforce the existing structure and is constrained by the size of a sample. The device includes ring mould, and the concrete column that treats the reinforcement is located ring mould, and ring mould's outside cover is equipped with the bearing, and fibre orientation subassembly passes through the linking arm subassembly and is connected with the bearing, and fibre orientation subassembly includes base plate and a plurality of steel needle, and the steel needle is equidistant along the length direction of base plate to be arranged, and its one end is connected to the base plate, and the annular clearance between ring mould and the concrete column is inserted to the other end, and during the bearing rotation, the steel needle synchronous rotation through linking arm subassembly drive fibre director to the steel fibre that makes pouring in the UHPC thick liquid in annular clearance is along the directional range of hoop.

Inventors

• WU XIANGGUO
• WANG RUI
• XU HAI
• RUAN WENQIANG
• LIN SEN
• ZHONG JING
• ZHAO XIN
• TIAN ZHENPENG
• ZHU HAINING

Assignees

• 哈尔滨工业大学

Dates

Publication Date

20260508

Application Date

20260108

Claims (8)

1. 1. The device comprises an annular die (7), the concrete column (8) to be reinforced is positioned in the annular die (7), and is characterized in that a bearing (6) is sleeved outside the annular die (7), a fiber orientation assembly is connected with the bearing (6) through a connecting arm assembly, the fiber orientation assembly comprises a base plate (4) and a plurality of steel needles (5), the steel needles (5) are arranged at equal intervals along the length direction of the base plate, one end of each steel needle is connected to the base plate (4), the other end of each steel needle is inserted into an annular gap between the annular die (7) and the concrete column (8), and when the bearing (6) rotates, the steel needles (5) of the fiber orientation device are driven to synchronously rotate through the connecting arm assembly, so that steel fibers in UHPC slurry poured in the annular gap are arranged in an annular orientation mode.
2. 2. The device for forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column according to claim 1, wherein the diameter of each steel needle (5) is 1 mm, and the interval between every two adjacent steel needles (5) is 14 mm.
3. 3. A device for forming a column of horizontally two-dimensional oriented steel fiber UHPC reinforced concrete according to claim 2, characterized in that the number of steel needles (5) is at least two.
4. 4. A device for forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column according to claim 3, characterized in that the number of steel needles (5) is adjusted to adapt to UHPC reinforcement layers of different thickness, so that the reinforcement cross-sectional area ratio is 0.32-0.85.
5. 5. A method for forming a device for forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column based on any one of claims 1 to 4, characterized in that it comprises the steps of: step 1, coaxially placing an existing concrete column (8) in the annular die (7); step 2, pouring UHPC slurry into an annular gap between the annular die (7) and the concrete column (8); Step 3, driving the bearing (6) to rotate, driving the fiber director assembly to rotate synchronously through the connecting arm assembly, and further enabling the steel needle (5) to rotate in the annular gap in a circumferential direction, so that the steel needle (5) in the UHPC slurry is arranged in the circumferential direction along the surface of the concrete column (8); And step 4, obtaining the UHPC reinforced concrete column with the steel fibers directionally distributed after the UHPC is solidified.
6. 6. The method for forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column of claim 5, wherein the thickness of the UHPC slurry casting is 5-15 mm a.
7. 7. The method for forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column according to claim 6, characterized in that the bearing (6) is rotated two times at a rotational speed of 0.1-60 °/s.
8. 8. A method of forming a horizontal two-dimensional oriented steel fiber UHPC reinforced concrete column according to claim 7, wherein said connecting arm assembly comprises a plurality of connecting rods hingedly or telescopically adjustable to each other to effect positional adjustment of said fiber orienter assembly in radial and axial directions.

Description

Forming device and method for horizontal two-dimensional directional steel fiber UHPC reinforced concrete column Technical Field The invention relates to the technical field of reinforcement of existing concrete structures, in particular to a horizontal two-dimensional directional steel fiber UHPC A device and a method for forming reinforced concrete columns. Background Existing concrete structures (such as piers, columns and the like) often have the problems of insufficient bearing capacity, reduced durability and the like due to low early design standards, material aging, increased load, environmental corrosion and the like. The UHPC is adopted for external reinforcement, the mechanical property and service life of the structure can be obviously improved due to high strength, high toughness and high durability, concrete reinforcement is generally poured on an external formwork, or other inorganic materials are generally adopted, but the improvement is limited, the durability is poor, and the like, an external magnetic field is used for orienting steel fibers through the magnetic field, a large number of coils are needed, the size is limited, the size is fixed, a large number of components cannot be made, however, the steel fibers are randomly distributed in a matrix in three dimensions in the UHPC reinforcement, the reinforcing efficiency of the fibers cannot be fully exerted, and the circumferential constraint effect on a concrete column is limited. Therefore, there is a need for a UHPC reinforcement molding device and process that has a simple structure, is convenient to operate, is suitable for different cross-sectional shapes and sizes, and can achieve directional arrangement of steel fibers. Disclosure of Invention The invention aims to solve the problems that the traditional concrete column has low bearing capacity, poor durability and short service life, the existing structure cannot be reinforced and the existing orientation technology is constrained by the size of a sample, and the like, and further provides a device and a method for forming the horizontal two-dimensional orientation steel fiber UHPC reinforced concrete column. The technical scheme adopted by the invention for solving the problems is as follows: the invention provides a forming device of a horizontal two-dimensional directional steel fiber UHPC reinforced concrete column, which comprises an annular die, wherein the concrete column to be reinforced is positioned in the annular die, a bearing is sleeved outside the annular die, a fiber directional component is connected with the bearing through a connecting arm component, the fiber directional component comprises a base plate and a plurality of steel needles, the steel needles are arranged at equal intervals along the length direction of the base plate, one end of each steel needle is connected to the base plate, the other end of each steel needle is inserted into an annular gap between the annular die and the concrete column, and when the bearing rotates, the steel needles of a fiber directional device are driven to synchronously rotate through the connecting arm component, so that steel fibers in UHPC slurry poured in the annular gap are directionally arranged along the annular direction. Further, the diameter of the steel needle is 1 mm, and the interval between every two adjacent steel needles 5 is 14 mm. Further, the number of the steel needles is at least two. Further, the number of the steel needles is adjusted to adapt to UHPC reinforcement layers with different thicknesses, so that the area ratio of the reinforcement cross section is 0.32-0.85. The invention also provides a forming method of the forming device based on the horizontal two-dimensional directional steel fiber UHPC reinforced concrete column, which comprises the following steps: Step 1, coaxially placing an existing concrete column in the annular die; Step 2, pouring UHPC slurry into an annular gap between the annular die and the concrete column; Step 3, driving the bearing to rotate, driving the fiber director assembly to rotate synchronously through the connecting arm assembly, and further enabling the steel needle to rotate in the annular gap in a circumferential direction, so that the steel needle in the UHPC slurry is arranged in a circumferential direction along the surface of the concrete column; And step 4, obtaining the UHPC reinforced concrete column with the steel fibers directionally distributed after the UHPC is solidified. Further, the thickness of the UHPC slurry casting is 5-15 mm. Further, the bearing rotates for two circles, and the rotation speed is 0.1-60 degrees/s. Further, the connecting arm assembly includes a plurality of connecting rods that are hingedly or telescopically adjustable with respect to one another to effect positional adjustment of the fiber-director assembly in the radial and axial directions. The beneficial effects of the invention are as follows: 1. The fiber director c