A reinforcement method and device for assembled concrete square column

Abstract

The present invention discloses a reinforcement method and device for assembled concrete square columns, wherein a precast concrete sleeve is sleeved on the concrete square column to be reinforced, a base groove and a steel bar groove are provided on the inner side of the precast concrete sleeve, a fixed base is fixed on the concrete square column to be reinforced, and the fixed base and the base groove are plugged together, a tensioning base is provided above the fixed base, prestressed steel bars are provided in the steel bar groove, prestressed steel bars are threadedly connected with prestressed nuts, and both the fixed base and the tensioning base are fixedly connected to the prestressed steel bars via prestressed nuts. The reinforcement method and device for assembled concrete square columns proposed by the present invention adopt a splicing structure, do not require large-scale machinery on site, are convenient to construct, and can shorten the construction period. At the same time, the prestressed steel bars fixed around the concrete square column to be reinforced can comprehensively improve the horizontal stiffness, bending bearing capacity and crack resistance of the concrete column under earthquake action.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforced concrete structure reinforcement, and more particularly to a reinforcement method and a reinforcement device for an assembled concrete square column. Background Art

[0002] Infrastructure construction has experienced rapid development for decades. With the continuous increase in the number of infrastructure projects, the demand for maintenance, reinforcement and repair brought about by the huge scale of infrastructure has also increased.

[0003] Existing reinforcement methods for concrete compression-bending members (columns) mainly include increasing the column cross-section with cast-in-place concrete, externally enclosing steel plates or fiber-reinforced polymer (FRP) restraints, and other methods. A more advanced reinforcement method is to reserve grooves on the surface of the concrete column and then fix the prefabricated concrete formwork to the surface of the concrete column with structural adhesives. However, these methods all have certain disadvantages. For example, the method of increasing the column cross-section with cast-in-place concrete requires complex formwork engineering and large-scale pouring equipment, and the construction period is long, and the pouring quality is difficult to control; externally enclosing steel plates faces the problem of steel plate corrosion; externally enclosing FRP restraints has very limited improvement on the bending resistance of concrete columns; and although externally enclosing precast concrete panels and other fixing methods are simple to construct, they do not significantly improve the horizontal stiffness, bending bearing capacity, and crack resistance of concrete columns during earthquakes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that it is inconvenient to pour concrete on-site for the reinforcement of concrete columns, and the improvement in the seismic performance of the concrete columns after reinforcement is limited. To overcome the shortcomings of the existing technology, the present invention proposes a reinforcement method and device for prefabricated concrete square columns. The method adopts a spliced ​​structure, which eliminates the need for large-scale machinery on site, facilitates construction, and shortens the construction period. At the same time, the prestressed steel bars fixed around the concrete square columns to be reinforced can comprehensively improve the horizontal stiffness, bending bearing capacity, and crack resistance of the concrete columns.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a reinforcement device for an assembled concrete square column, comprising a precast concrete sleeve, a fixed base, prestressed steel bars, a tensioning base and prestressed nuts.

[0007] The precast concrete sleeve is sleeved on the concrete square column to be reinforced. A base groove and a steel bar groove are opened on the inner side of the precast concrete sleeve. The fixed base is on the concrete square column to be reinforced, and the fixed base and the base groove are plugged into each other. A tensioning base is arranged above the fixed base, and prestressed steel bars are arranged in the steel bar groove. Prestressed nuts are threaded on the prestressed steel bars, and the fixed base and the tensioning base are fixedly connected to the prestressed steel bars through prestressed nuts.

[0008] In a preferred technical solution of the present invention, the precast concrete sleeve is a closed structure formed by splicing two or more precast concrete panels end to end.

[0009] In a preferred technical solution of the present invention, the fixed base and the tensioning base are both composed of an inner fixed block and an outer fixed block, and semicircular grooves and mounting holes are provided on the inner fixed block and the outer fixed block. Prestressed bolts are inserted into the mounting holes to fix the inner fixed block and the outer fixed block in connection.

[0010] In a preferred technical solution of the present invention, the concrete square column to be reinforced is further provided with a reinforcement hole, and the prestressed bolts are bonded to the reinforcement hole by reinforcement glue.

[0011] In a preferred technical solution of the present invention, force-bearing seats are provided at both ends of the tensioning base, and the force-bearing seats can abut against the output end of the jack.

[0012] The present invention also provides a reinforcement method for a reinforcement device of an assembled concrete square column, the method comprising:

[0013] S1. Grind and clean the surface of the reinforced concrete square column;

[0014] S2. Drill holes for planting reinforcement bars on the concrete square column to be reinforced, and use adhesive to bond the inner fixing blocks of the fixed base to the surface of the square column;

[0015] S3. Place the prestressed steel bar in the semicircular groove between the inner and outer fixing blocks of the fixed base, then insert one end of the prestressed bolt through the mounting hole and into the rebar hole, and fix the prestressed bolt in the rebar hole with rebar glue;

[0016] S4. Place the upper end of the prestressed steel bar in the semicircular groove between the inner and outer fixing blocks of the tensioning base, insert the prestressed bolt through the mounting hole, and securely connect the inner and outer fixing blocks to clamp the prestressed steel bar.

[0017] S5. Use a jack to lift the tension base until the mounting holes on the tension base are aligned with the rebar holes on the concrete square column to be reinforced. Insert the prestressed bolts into the rebar holes and fix the tension base to the concrete square column to be reinforced using rebar glue.

[0018] S6. Cut and remove the force bearing seats at both ends of the tensioning base so that the width of the tensioning base is consistent with that of the fixed base and matches the width of the base groove;

[0019] S7. Pour adhesive into the base groove and the steel bar groove, and evenly apply the adhesive on the surface of the concrete square column to be reinforced;

[0020] S8. Align the fixed base with the base groove position and the prestressed steel bar with the steel bar groove position, and then install the precast concrete slab on the concrete square column to be reinforced to form a precast concrete sleeve.

[0021] In a preferred technical solution of the present invention, the binder is an organic binder or an inorganic binder.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention proposes a reinforcement device for assembled concrete square columns, which adopts a splicing structure. No large-scale machinery is required on site, construction is convenient, and the construction period can be shortened. It is particularly suitable for the rapid reinforcement and performance improvement of concrete columns in complex environments such as after disasters or in the wild.

[0024] 2. The present invention proposes a reinforcement device for prefabricated concrete square columns. Prestressed steel bars are added to the side of the concrete square columns to be processed, and the prestress of the prestressed steel bars is transferred to the precast concrete columns using a fixed base, thereby adding new prestress to the original concrete columns, significantly improving the horizontal stiffness, bending bearing capacity and crack resistance of the concrete columns. At the same time, the precast concrete sleeves increase the cross-sectional area of ​​the original concrete columns, thereby improving the vertical compressive resistance of the concrete columns, so that the horizontal stiffness and vertical stiffness of the entire concrete column are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a reinforcement device for an assembled concrete square column provided in a specific embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the installation structure of prestressed steel bars;

[0027] Figure 3 yes Figure 1 Schematic diagram of the structure of the fixed base.

[0028] In the picture:

[0029] 1. Concrete square column to be reinforced; 11. Rebar embedding hole; 2. Precast concrete sleeve; 21. Base groove; 22. Rebar groove; 23. Precast concrete slab; 3. Fixed base; 4. Prestressed steel bar; 5. Tensioning base; 51. Load bearing seat; 6. Prestressed nut; 71. Inner fixing block; 72. Outer fixing block; 73. Semicircular groove; 74. Mounting hole; 8. Prestressed bolt; 9. Jack. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] like Figure 1-3 As shown, an embodiment provides a reinforcement device for an assembled concrete square column, comprising a precast concrete sleeve 2, a fixed base 3, prestressed steel bars 4, a tensioning base 5 and a prestressed nut 6.

[0032] The precast concrete sleeve 2 is sleeved on the concrete square column 1 to be reinforced. A base groove 21 and a steel bar groove 22 are opened on the inner side of the precast concrete sleeve 2. The fixed base 3 is fixed on the concrete square column 1 to be reinforced, and the fixed base 3 and the base groove 21 are plugged into each other. A tensioning base 5 is arranged above the fixed base 3, and a prestressed steel bar 4 is arranged in the steel bar groove 22. A prestressed nut 6 is threadedly connected to the prestressed steel bar 4, and the fixed base 3 and the tensioning base 5 are fixedly connected to the prestressed steel bar 4 through the prestressed nut 6.

[0033] In this embodiment, the material of the precast concrete sleeve 2 includes ordinary concrete, high-strength concrete, fiber concrete, rubber concrete and recycled concrete, wherein the precast concrete sleeve 2 is a square sleeve, and the inner wall of the precast concrete sleeve 2 is tightly attached to the side wall of the concrete square column 1 to be reinforced. Two or more fixed bases 3 are provided on the four sides of the concrete square column 1 to be reinforced, and the fixed base 3 is fixed to the concrete square column 1 to be reinforced by an adhesive. The material of the fixed base 3 and the tensioning base 5 can be selected from low-alloy structural steel or ordinary carbon structural steel. Through holes are provided on the fixed base 3 and the tensioning base 5 for the prestressed steel bar 4 to pass through. The prestressed steel bar 4 is a threaded steel bar, and the prestressed nut 6 is a precision-rolled threaded steel nut. The prestressed nut 6 can be used to fix the fixed base 3 and the tensioning base 5 to the side wall of the concrete square column 1 to be reinforced. In addition, the initial length of the tensioning base 5 should be greater than the width of the concrete square column 1 to be reinforced, and it is cut off with a cutting machine after the tensioning is completed, so that the length of the tensioning base 5 matches the width of the concrete square column 1 to be reinforced, so that it can be embedded in the precast concrete sleeve 2.

[0034] Specifically, the precast concrete sleeve 2 is formed by splicing two or more precast concrete panels 23 end to end to form a closed structure.

[0035] In this embodiment, the precast concrete slabs 23 are rectangular slabs. A precast concrete slab 23 is correspondingly provided on the side wall of each concrete square column 1 to be reinforced, and two adjacent precast concrete slabs 23 are fixedly connected by an adhesive to form a closed square tube.

[0036] Specifically, the fixed base 3 and the tensioning base 5 are both composed of an inner fixing block 71 and an outer fixing block 72. A semicircular groove 73 and a mounting hole 74 are provided on the inner fixing block 71 and the outer fixing block 72. The prestressed bolt 8 is a round-headed refined bolt that can be inserted into the mounting hole 74, so that the inner fixing block 71 and the outer fixing block 72 are firmly connected.

[0037] In this embodiment, two or more semicircular grooves 73 are vertically provided on the side where the inner fixing block 71 and the outer fixing block 72 are close to each other, and the semicircular grooves 73 on the inner fixing block 71 and the semicircular grooves 73 on the outer fixing block 72 can be spliced ​​to form a complete through hole, and the prestressed steel bar 4 can pass through the through hole, thereby connecting the prestressed steel bar 4 with the fixed base 3 and the tensioning base 5.

[0038] Specifically, the reinforced concrete square column 1 is provided with a reinforcement hole 11, and the prestressed bolt 8 is bonded to the reinforcement hole 11 by a reinforcement glue. The tensioning base 5 is provided with a force bearing seat 51 at both ends, and the force bearing seat 51 can abut against the output end of the jack 9.

[0039] In this embodiment, anchor holes 11 are formed in the sidewalls of the reinforced concrete column 1. These holes, in conjunction with prestressed bolts 8, secure the fixed base 3 and tensioning base 5 to the reinforced concrete column 1. Jacks 9 push the tensioning base 5 upward, thereby stretching the prestressed steel bars 4 and applying prestressing force to them. By securing the tensioning base 5 to the sidewalls of the reinforced concrete column 1, preload is applied to the column 1, improving its bending strength and crack resistance.

[0040] The present invention also provides a reinforcement method for a reinforcement device of an assembled concrete square column, the method comprising:

[0041] S1. Grind and clean the surface of the concrete 1 to be reinforced;

[0042] S2, opening a rebar hole 11 on the concrete square column 1 to be reinforced, and using an adhesive to bond the inner fixing block 71 of the fixing base 3 to the surface of the concrete square column 1 to be reinforced;

[0043] S3. Place the prestressed steel bar 4 in the semicircular groove 73 between the inner fixing block 71 and the outer fixing block 72 of the fixed base 3, then insert one end of the prestressed bolt 8 through the mounting hole 74 and into the anchor hole 11, and fix the prestressed bolt 8 in the anchor hole 11 with anchor glue;

[0044] S4. Place the upper end of the prestressed steel bar 4 in the semicircular groove 73 between the inner fixing block 71 and the outer fixing block 72 of the tensioning base 5, and insert the prestressed bolt 8 through the mounting hole 74 to securely connect the inner fixing block 71 and the outer fixing block 72, thereby clamping the prestressed steel bar 4.

[0045] S5. Use the jack 9 to lift the tension base 5 until the mounting holes 74 on the tension base 5 are aligned with the anchor holes 11 on the concrete square column 1 to be reinforced. At this time, insert the prestressed bolts 8 into the anchor holes 11 and fix the tension base 5 to the concrete square column 1 to be reinforced using anchor glue.

[0046] S6. Cut and remove the force bearing seats 51 at both ends of the tensioning base 5 so that the width of the tensioning base 5 is consistent with that of the fixed base 3 and matches the width of the base groove 21;

[0047] S7, pouring adhesive into the base groove 21 and the steel bar groove 22, and evenly applying the adhesive on the surface of the concrete square column 1 to be reinforced;

[0048] S8. Align the fixed base 3 with the base groove 21 and the prestressed steel bar 4 with the steel bar groove 22, and then install the precast concrete slab 23 on the concrete square column 1 to be reinforced to form a precast concrete sleeve 2.

[0049] Specifically, the binder is an organic binder or an inorganic binder.

[0050] In this embodiment, the organic binder is preferably a resin, and the inorganic binder is preferably an inorganic binder containing borax and magnesium sulfate as main components.

[0051] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various modifications or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A reinforcement device for an assembled concrete square column, comprising a precast concrete sleeve (2), a fixed base (3), prestressed steel bars (4), a tensioning base (5) and a prestressed nut (6), characterized in that: A precast concrete sleeve (2) is sleeved on the concrete square column (1) to be reinforced, a base groove (21) and a steel bar groove (22) are provided on the inner side of the precast concrete sleeve (2), a fixed base (3) is fixed on the concrete square column (1) to be reinforced, and the fixed base (3) and the base groove (21) are plugged into each other, a tensioning base (5) is provided above the fixed base (3), a prestressed steel bar (4) is provided in the steel bar groove (22), a prestressed nut (6) is threadedly connected to the prestressed steel bar (4), and the fixed base (3) and the tensioning base (5) are both fixedly connected to the prestressed steel bar (4) through the prestressed nut (6); The fixed base (3) and the tensioning base (5) are both formed by splicing an inner fixing block (71) and an outer fixing block (72), and the inner fixing block (71) and the outer fixing block (72) are both provided with a semicircular groove (73) and a mounting hole (74), and the prestressed bolt (8) is inserted into the mounting hole (74) to fix the inner fixing block (71) and the outer fixing block (72) together; The concrete square column (1) to be reinforced is also provided with a reinforcement hole (11), and the prestressed bolt (8) is bonded to the reinforcement hole (11) by means of reinforcement glue.

2. The reinforcement device for an assembled concrete square column according to claim 1, characterized in that: The precast concrete sleeve (2) is formed by splicing two or more precast concrete panels (23) end to end to form a closed structure.

3. The reinforcement device for an assembled concrete square column according to claim 1, characterized in that: Both ends of the tensioning base (5) are provided with force-bearing seats (51), and the force-bearing seats (51) can abut against the output end of the jack (9).

4. A method for reinforcing a prefabricated concrete square column according to any one of claims 1 to 3, characterized in that: S1. Grind and clean the surface of the reinforced concrete square column (1); S2, opening a reinforcing bar hole (11) on the concrete square column (1) to be reinforced, and using an adhesive to bond the inner fixing block (71) of the fixed base (3) to the surface of the concrete square column (1) to be reinforced; S3, placing the prestressed steel bar (4) in the semicircular groove (73) between the inner fixing block (71) and the outer fixing block (72) of the fixed base (3), then inserting one end of the prestressed bolt (8) through the mounting hole (74) and into the anchor hole (11), and fixing the prestressed bolt (8) in the anchor hole (11) using anchor glue; S4, placing the upper end of the prestressed steel bar (4) in the semicircular groove (73) between the inner fixing block (71) and the outer fixing block (72) of the tensioning base (5), passing the prestressed bolt (8) through the mounting hole (74), so that the inner fixing block (71) and the outer fixing block (72) are fixedly connected, thereby clamping the prestressed steel bar (4); S5. Use the jack (9) to lift the tensioning base (5) until the mounting hole (74) on the tensioning base (5) is aligned with the anchor hole (11) on the concrete square column (1) to be reinforced. At this time, insert the prestressed bolt (8) into the anchor hole (11), and use anchor glue to fix the tensioning base (5) on the concrete square column (1) to be reinforced. S6. Cut and remove the force bearing seats (51) at both ends of the tensioning base (5) so that the width of the tensioning base (5) is consistent with that of the fixed base (3) and matches the width of the base groove (21); S7, pouring adhesive into the base groove (21) and the steel bar groove (22), and evenly applying the adhesive on the surface of the concrete square column (1) to be reinforced; S8, aligning the fixed base (3) with the base groove (21) and the prestressed steel bar (4) with the steel bar groove (22), and then installing the precast concrete slab (23) on the concrete square column (1) to be reinforced to form a precast concrete sleeve (2).

5. The reinforcement device for an assembled concrete square column according to claim 4, characterized in that: The binder is an organic binder or an inorganic binder.

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