CN107268459B - Construction method for prestressed fiber cloth reinforced concrete pier column - Google Patents
Construction method for prestressed fiber cloth reinforced concrete pier column Download PDFInfo
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- CN107268459B CN107268459B CN201710465989.7A CN201710465989A CN107268459B CN 107268459 B CN107268459 B CN 107268459B CN 201710465989 A CN201710465989 A CN 201710465989A CN 107268459 B CN107268459 B CN 107268459B
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- anchor rod
- reinforced concrete
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- 239000000835 fiber Substances 0.000 title claims abstract description 77
- 239000004744 fabric Substances 0.000 title claims abstract description 75
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 47
- 238000010276 construction Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 18
- 229920006335 epoxy glue Polymers 0.000 claims abstract description 9
- 238000004873 anchoring Methods 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 2
- 230000001680 brushing effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a construction method for a prestressed fiber cloth reinforced concrete pier column. The rotary self-locking tensioning anchoring device for the prestressed fiber cloth comprises two anchor rods, two clamping pieces, two anchor heads, four unidirectional bearings for maintaining prestress, eight wedge blocks and the fiber cloth. Determining a position to be reinforced, polishing, repairing holes, brushing an epoxy glue layer, then completing connection of fiber cloth and an anchor, wrapping the connected fiber cloth at the position to be reinforced, and tensioning the fiber cloth through a stressing spanner, namely reinforcing construction of the reinforced concrete pier column. The method is simple to operate, the phenomenon of bending of the screw rod when the tension force is large in the process of applying the force by the clip type anchorage is avoided, and the anchorage device used in the method has the advantages of small required operation space, simple structure, convenient operation and low cost.
Description
Technical Field
The invention belongs to the field of civil engineering structure reinforcement, and particularly relates to a construction method for reinforcing a reinforced concrete pier column by adopting a prestressed fiber cloth of a rotary self-locking anchor.
Background
The fiber composite reinforced material has the characteristics of high unidirectional tensile strength, light weight, high elastic modulus, small volume, corrosion resistance and the like, and the section and load increase of the original structural member are not large after the reinforcement, so that the fiber composite reinforced material is widely applied to reinforcement of a concrete structure. In practical application, prestress is applied to the circumferential fiber material, and the prestress fiber material constrains the reinforced concrete column to enable the core concrete to be effectively laterally constrained on the premise of improving the utilization rate of the material. Because the application of the prestress of the fiber materials in the construction method for reinforcing the concrete pier column by the prestress fiber cloth is limited by the anchorage devices, the mature anchorage devices in the market at present are few, the clamping effect is not ideal, and the reinforcing effect is required to be reinforced.
Disclosure of Invention
The invention aims to solve the problems of tensioning and anchoring of prestressed fiber cloth in the tensioning process in the construction of a prestressed fiber cloth reinforced concrete pier column, and further provides a construction method for reinforcing a reinforced concrete pier column by adopting the prestressed fiber cloth of a rotary self-locking anchor.
The method comprises the following specific steps:
(1) The method comprises the steps of arranging a prestress fiber cloth rotary self-locking tensioning anchoring device, wherein the prestress fiber cloth rotary self-locking tensioning anchoring device comprises two anchor rods, two clamping pieces, two anchor heads, four unidirectional bearings for keeping prestress, eight wedge blocks and fiber cloth; the anchor rod consists of anchor rod ends at two ends, a hexagon nut and an anchor body, wherein the anchor rod ends at two ends are respectively provided with an anchor rod U-shaped groove, and the two ends of the anchor body are provided with clamping piece mounting holes; the two ends of the clamping piece are correspondingly provided with clamping piece mounting holes, and screws penetrate through the corresponding clamping piece mounting holes to fixedly connect the clamping piece and the anchor rod; the anchor head is provided with two mounting holes, each mounting hole consists of a small hole and a large hole, the aperture and the hole depth of the small hole and the large hole are consistent with the diameters and the depths of the anchor rod end connected with the anchor head and the unidirectional bearing, and an anchor head U-shaped groove is formed in the large hole; the anchor head selects an L-shaped flat plate clung to the surface of the square column or an arc plate clung to the surface of the column according to the square column or the column of the reinforced concrete pier column to be reinforced.
(2) Determining a reinforcement position on the reinforced concrete pier column; and (3) if the reinforced concrete pier column is a square column, polishing and chamfering three corners of the square column by using a polisher, and if the reinforced concrete pier column is a cylinder, directly entering the step (3).
(3) Polishing and hole repairing are carried out on the surface of the reinforced concrete pier column, and then an epoxy glue layer is uniformly coated on the surface of the range, which is wrapped by the prestressed fiber cloth, of the reinforced concrete pier column.
(4) And determining the blanking length of the fiber cloth and cutting.
(5) Clamping one end head of the fiber cloth cut in the step (4) between the anchor rod and the clamping piece, screwing down a screw in a clamping piece mounting hole to fix the anchor rod and the clamping piece, winding the fiber cloth for 1-2 circles along the anchor rod and the clamping piece in a circumferential direction, and ensuring that the fiber cloth is tightly wrapped between the anchor rod and the clamping piece in the winding process; repeating the steps of clamping the anchor rod and the clamping piece and winding in the circumferential direction on the other end of the fiber cloth to finish the connection of the fiber cloth and the anchor.
(6) And respectively placing the four unidirectional bearings into reserved large holes of the two anchor heads, paying attention to the directions of the unidirectional bearings, aligning the U-shaped grooves of the unidirectional bearings on the unidirectional bearings with the U-shaped grooves of the anchor heads on the anchor heads, and placing the wedge blocks.
(7) Wrapping the fiber cloth connected in the step (5) on the reinforced position of the reinforced concrete pier column uniformly coated with a layer of epoxy glue layer in the step (3), penetrating the anchor rod ends at two ends of the anchor rod into small holes of the anchor head respectively, aligning the U-shaped groove of the anchor rod on the end of the anchor rod with a one-way bearing notch on the one-way bearing, and putting the U-shaped groove into a wedge block.
(8) And (3) placing the stressing spanner at the hexagon nut of the anchor rod, and pulling the stressing spanner to drive the two anchor rods and the clamping pieces which are wound with the fiber cloth to rotate, so that the tensile stress in the fiber cloth is gradually increased until the required control stress is loaded, and the reinforcement construction of the reinforced concrete pier column is realized.
Compared with the prior art, the method has the advantages that: (1) The method is simple to operate, and particularly for reinforcing square columns, the friction loss of one corner of the fiber cloth in the application process is avoided and the treatment of one corner in the reinforcing process is reduced due to the fact that the device is placed at one corner of the column. (2) The bending phenomenon of the screw rod when the tension force is large in the process of applying force by the clip type anchorage is avoided. (3) The anchorage device of the construction method has the advantages of small required operation space, simple structure, convenient operation and low cost.
Drawings
Fig. 1 is a schematic installation diagram of a prestressed fiber cloth rotary self-locking type tensioning anchoring device used when the reinforced concrete pier column is a square column in embodiment 1 of the present invention.
Fig. 2 is a plan view showing the installation of a prestressed fiber cloth rotary self-locking type tension anchor device used when the reinforced concrete pier column of embodiment 1 of the present invention is a square column.
Fig. 3 is a schematic installation diagram of a prestressed fiber cloth rotary self-locking type tension anchor device used when the reinforced concrete pier column is a cylinder in embodiment 1 of the present invention.
Fig. 4 is a plan view showing the installation of a prestressed fiber cloth rotary self-locking type tension anchor device used when the reinforced concrete pier column of embodiment 1 of the present invention is a cylinder.
Fig. 5 is a schematic structural view of an anchor head, a one-way bearing, and a wedge used in an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an anchor rod and a clip used in an embodiment of the present invention.
The marks in the figure: 1-anchor rod; 11-anchor rod ends; 12-hex nuts; 13-anchor body; 131-clip mounting holes; 111-anchor bar U-shaped groove; 2-clamping pieces; 21-a screw; 3-anchor heads; 31-small holes; 32-macropores; 321-anchor head U-shaped grooves; 4-a one-way bearing; 41-a one-way bearing gap; 42-a one-way bearing U-shaped groove; 5-wedge block; 6-fiber cloth; 7-reinforced concrete square columns; 8-reinforced concrete cylinder.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, 2, 5 and 6, in this embodiment, the reinforced concrete square column 7 is reinforced by using a prestressed fiber cloth, and the width of the fiber cloth 6 is 150mm. The method comprises the following specific steps:
(1) The device comprises two anchor rods 1, two clamping pieces 2, two anchor heads 3, four unidirectional bearings 4 for keeping prestress, eight wedges 5 and a fiber cloth 6; the anchor rod 1 consists of anchor rod end heads 11 at two ends, a hexagon nut 12 and an anchor body 13, wherein the anchor rod end heads 11 at two ends are respectively provided with an anchor rod U-shaped groove 111, and two ends of the anchor body 13 are provided with clamping piece mounting holes 131; the two ends of the clamping piece 2 are correspondingly provided with clamping piece mounting holes 131, and screws 21 penetrate through the corresponding clamping piece mounting holes 131 to fixedly connect the clamping piece 2 with the anchor rod 1; two mounting holes are formed in the middle of the anchor head 3, and each mounting hole consists of a small hole 31 and a large hole 32. The diameters and depths of the small holes 31 and the large holes 32 are consistent with the diameters and depths of the anchor rod end 11 and the one-way bearing 4 connected with the anchor head 3. An anchor head U-shaped notch 321 is formed at the large hole 32; the anchor head 3 is an L-shaped flat plate which is tightly attached to the surface of the reinforced concrete square column 7.
(2) Determining the reinforcing position on the reinforced concrete square column 7; three corners of the reinforced concrete square column 7 are polished and chamfered by a polisher.
(3) Polishing and hole repairing are carried out on the surface of the reinforced concrete square column 7, and then an epoxy glue layer is uniformly coated on the surface of the range, which is wrapped by the reinforced concrete square column 7 by the prestressed fiber cloth, of the range.
(4) The blanking length of the fiber cloth 6 is determined and cut. The blanking length of the fibre cloth 6 = 2 times the perimeter of the Zhou Changjia anchor rod of the column at the wrapping location.
(5) Clamping one end head of the fiber cloth 6 cut in the step (4) between the anchor rod 1 and the clamping piece 2, screwing a screw 21 in a clamping piece mounting hole 131 to fix the anchor rod 1 and the clamping piece 2, winding the fiber cloth 6 along the anchor rod 1 and the clamping piece 2 in a circumferential direction for 2 circles, and ensuring that the fiber cloth 6 is tightly wrapped between the anchor rod 1 and the clamping piece 2 in the winding process; and repeating the steps of clamping and circumferential winding of the anchor rod 1 and the clamping piece 2 on the other end of the fiber cloth 6 to finish the connection of the fiber cloth 6 and an anchorage device.
(6) The four unidirectional bearings 4 are placed in the reserved large holes 32 of the two anchor heads 3 respectively, the direction of the unidirectional bearings 4 is noted, and the unidirectional bearing U-shaped grooves 42 on the unidirectional bearings 4 are aligned with the anchor head U-shaped grooves 321 on the anchor heads and placed into the wedge blocks 5.
(7) Wrapping the fiber cloth 6 connected in the step (5) on the reinforced position of the reinforced concrete square column 7 uniformly coated with an epoxy glue layer in the step (3), penetrating the anchor rod ends 11 at the two ends of the anchor rod 1 into the small holes 31 of the anchor head 3 respectively, aligning the anchor rod U-shaped grooves 111 on the anchor rod ends 11 with the unidirectional bearing notches 41 on the unidirectional bearing 4, and placing the wedge blocks 5.
(8) And (3) placing a force spanner at the hexagon nut 12 of the anchor rod 1, and pulling the force spanner to drive the two anchor rods 1 and the clamping pieces 2 wound with the fiber cloth 6 to rotate, so that the tensile stress in the fiber cloth 6 is gradually increased until the required control stress is loaded, namely 7 reinforcement construction of the reinforced concrete square column is realized.
Example 2:
as shown in fig. 3 to 6, in this embodiment, the reinforced concrete cylinder 8 is reinforced by using the reinforced concrete cylinder 8 as a reinforcing object, and the prestressed fiber cloth is used to reinforce the reinforced concrete cylinder 8, where the width of the fiber cloth 6 is 150mm. The method comprises the following specific steps:
(1) The device comprises two anchor rods 1, two clamping pieces 2, two anchor heads 3, four unidirectional bearings 4 for keeping prestress, eight wedges 5 and a fiber cloth 6; the anchor rod 1 consists of anchor rod end heads 11 at two ends, a hexagon nut 12 and an anchor body 13, wherein the anchor rod end heads 11 at two ends are respectively provided with an anchor rod U-shaped groove 111, and two ends of the anchor body 13 are provided with clamping piece mounting holes 131; the two ends of the clamping piece 2 are correspondingly provided with clamping piece mounting holes 131, and screws 21 penetrate through the corresponding clamping piece mounting holes 131 to fixedly connect the clamping piece 2 with the anchor rod 1; two mounting holes are formed in the middle of the anchor head 3, and each mounting hole consists of a small hole 31 and a large hole 32. The diameters and depths of the small holes 31 and the large holes 32 are consistent with the diameters and depths of the anchor rod end 11 and the one-way bearing 4 connected with the anchor head 3. An anchor head U-shaped notch 321 is formed at the large hole 32; the anchor head 3 is an arc plate which is tightly attached to the surface of the reinforced concrete cylinder 8.
(2) Polishing and hole repairing are carried out on the surface of the reinforced concrete cylinder 8, and then an epoxy glue layer is uniformly coated on the surface of the reinforced concrete cylinder 8 in the range where the prestressed fiber cloth is required to be wrapped.
(3) The blanking length of the fiber cloth 6 is determined and cut. The blanking length of the fibre cloth 6 = 1 times the perimeter of the Zhou Changjia anchor rod of the column at the wrapping location.
(4) Clamping one end head of the fiber cloth 6 cut in the step (3) between the anchor rod 1 and the clamping piece 2, screwing a screw 21 in a clamping piece mounting hole 131 to fix the anchor rod 1 and the clamping piece 2, winding the fiber cloth 6 for 1 circle along the anchor rod 1 and the clamping piece 2 in a circumferential direction, and ensuring that the fiber cloth 6 is tightly wrapped between the anchor rod 1 and the clamping piece 2 in the winding process; and repeating the steps of clamping and circumferential winding of the anchor rod 1 and the clamping piece 2 on the other end of the fiber cloth 6 to finish the connection of the fiber cloth 6 and an anchorage device.
(5) The four unidirectional bearings 4 are placed in the reserved large holes 32 of the two anchor heads 3 respectively, the direction of the unidirectional bearings 4 is noted, and the unidirectional bearing U-shaped grooves 42 on the unidirectional bearings 4 are aligned with the anchor head U-shaped grooves 321 on the anchor heads and placed into the wedge blocks 5.
(6) Wrapping the fiber cloth 6 connected in the step (4) on the reinforced position of the reinforced concrete cylinder 8 uniformly coated with an epoxy glue layer in the step (2), penetrating the anchor rod ends 11 at the two ends of the anchor rod 1 into the small holes 31 of the anchor head 3 respectively, aligning the anchor rod U-shaped grooves 111 on the anchor rod ends 11 with the unidirectional bearing notches 41 on the unidirectional bearing 4, and placing the wedge blocks 5.
(7) And (3) placing a force spanner at the hexagon nut 12 of the anchor rod 1, and pulling the force spanner to drive the two anchor rods 1 and the clamping pieces 2 wound with the fiber cloth 6 to rotate, so that the tensile stress in the fiber cloth 6 is gradually increased until the required control stress is loaded, namely, the reinforcement construction of the reinforced concrete cylinder 8 is realized.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make modifications or additions to the described embodiments or substitutions in a similar manner without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (1)
1. A construction method for a prestressed fiber cloth reinforced concrete pier column is characterized by comprising the following specific steps:
(1) The method comprises the steps of arranging a prestress fiber cloth rotary self-locking tensioning anchoring device, wherein the prestress fiber cloth rotary self-locking tensioning anchoring device comprises two anchor rods, two clamping pieces, two anchor heads, four unidirectional bearings for keeping prestress, eight wedge blocks and fiber cloth; the anchor rod consists of anchor rod ends at two ends, a hexagon nut and an anchor body, wherein the anchor rod ends at two ends are respectively provided with an anchor rod U-shaped groove, and the two ends of the anchor body are provided with clamping piece mounting holes; the two ends of the clamping piece are correspondingly provided with clamping piece mounting holes, and screws penetrate through the corresponding clamping piece mounting holes to fixedly connect the clamping piece and the anchor rod; the anchor head is provided with two mounting holes, each mounting hole consists of a small hole and a large hole, the aperture and the hole depth of the small hole and the large hole are consistent with the diameters and the depths of the anchor rod end connected with the anchor head and the unidirectional bearing, and an anchor head U-shaped groove is formed in the large hole; the anchor head respectively selects an L-shaped flat plate clung to the surface of the square column or an arc plate clung to the surface of the column according to the square column or the column of the reinforced concrete pier column to be reinforced;
(2) Determining a reinforcement position on the reinforced concrete pier column; if the reinforced concrete pier column is a square column, polishing and chamfering three corners of the square column by using a polisher, and if the reinforced concrete pier column is a cylinder, directly entering the step (3);
(3) Polishing and hole repairing are carried out on the surface of the reinforced concrete pier column, and then an epoxy glue layer is uniformly coated on the surface of the range, which is wrapped by the prestressed fiber cloth, of the reinforced concrete pier column;
(4) Determining the blanking length of the fiber cloth and cutting; the blanking length of the fiber cloth is equal to 1-2 times of the perimeter of the Zhou Changjia anchor rod of the column at the wrapping position;
(5) Clamping one end head of the fiber cloth cut in the step (4) between the anchor rod and the clamping piece, screwing down a screw in a clamping piece mounting hole to fix the anchor rod and the clamping piece, winding the fiber cloth for 1-2 circles along the anchor rod and the clamping piece in a circumferential direction, and ensuring that the fiber cloth is tightly wrapped between the anchor rod and the clamping piece in the winding process; repeating the steps of clamping and circumferential winding of the anchor rod and the clamping piece on the other end of the fiber cloth to finish the connection of the fiber cloth and the anchor;
(6) Respectively placing the four unidirectional bearings into reserved large holes of the two anchor heads, paying attention to the direction of the unidirectional bearings, aligning the U-shaped grooves of the unidirectional bearings on the unidirectional bearings with the U-shaped grooves of the anchor heads on the anchor heads, and placing the U-shaped grooves into the wedge blocks;
(7) Wrapping the fiber cloth connected in the step (5) on the reinforced position of the reinforced concrete pier column uniformly coated with a layer of epoxy glue layer in the step (3), penetrating the anchor rod ends at two ends of the anchor rod into small holes of the anchor head respectively, aligning the U-shaped groove of the anchor rod on the end of the anchor rod with a unidirectional bearing notch on the unidirectional bearing, and putting the U-shaped groove into a wedge block;
(8) And (3) placing the stressing spanner at the hexagon nut of the anchor rod, and pulling the stressing spanner to drive the two anchor rods and the clamping pieces which are wound with the fiber cloth to rotate, so that the tensile stress in the fiber cloth is gradually increased until the required control stress is loaded, and the reinforcement construction of the reinforced concrete pier column is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710465989.7A CN107268459B (en) | 2017-06-19 | 2017-06-19 | Construction method for prestressed fiber cloth reinforced concrete pier column |
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| CN201710465989.7A CN107268459B (en) | 2017-06-19 | 2017-06-19 | Construction method for prestressed fiber cloth reinforced concrete pier column |
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| CN107268459A CN107268459A (en) | 2017-10-20 |
| CN107268459B true CN107268459B (en) | 2023-08-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359380A (en) * | 2019-08-09 | 2019-10-22 | 上海悍马建筑科技有限公司 | The three-dimensional tensioning equipment of concrete foundation cushion cap prestressing force |
| CN112942684B (en) * | 2021-02-04 | 2022-08-16 | 北京工业大学 | Strip-type component tensioning and anchoring integrated device with multiple anchoring capabilities |
| CN113700323B (en) * | 2021-09-02 | 2023-03-28 | 山西建筑工程集团有限公司 | PC component field installation grouting node constant temperature maintenance device |
| CN114809693B (en) * | 2022-03-21 | 2023-05-02 | 重庆科技学院 | High-load self-restraint reinforcing device for existing reinforced concrete column |
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Application publication date: 20171020 Assignee: Guangxi hanximing Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2023980046002 Denomination of invention: A construction method for strengthening reinforced concrete pier columns with prestressed fiber cloth Granted publication date: 20230811 License type: Common License Record date: 20231107 |
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