CN106760608B - Prestressed fiberboard tensioning end deviation rectifying type anchoring device and anchoring method thereof - Google Patents
Prestressed fiberboard tensioning end deviation rectifying type anchoring device and anchoring method thereof Download PDFInfo
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- CN106760608B CN106760608B CN201611244003.5A CN201611244003A CN106760608B CN 106760608 B CN106760608 B CN 106760608B CN 201611244003 A CN201611244003 A CN 201611244003A CN 106760608 B CN106760608 B CN 106760608B
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- E—FIXED CONSTRUCTIONS
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- 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
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- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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Abstract
A prestressed fiberboard tensioning end deviation rectifying type anchoring device comprises a tensioning end anchorage device, a tensioning reaction frame, a tensioning guide rod, a tensioning baffle and a jack; a deviation rectifying mechanism is arranged between the tensioning end anchorage device and the tensioning baffle. According to the invention, a tensioning reaction frame is positioned and installed by utilizing the linear relation between the tensioning force and the elongation of the fiber board, and when the fiber board is tensioned until a reserved waist-shaped hole on an anchorage cover plate at the tensioning end is basically coincident with a reserved inner tapping round hole on a base plate of the tensioning reaction frame, the anchorage at the tensioning end is connected with the tensioning reaction frame by using a high-strength bolt, so that the anchorage of the anchorage at the tensioning end is completed. By applying the device and the method, the tensioning guide rod can be detached after the prestressed tensioning of the fiber board is finished, and the problem of insufficient durability commonly existing in the conventional method for anchoring the tensioning guide rod at the tensioning end of the prestressed fiber board is solved. The deviation rectifying mechanism can greatly reduce the actual reinforcing cost and the construction difficulty, improve the stress condition of the vertical plate of the tensioning reaction frame and enable the stress of the tensioning guide rod to be more reasonable in the tensioning process.
Description
Technical Field
The invention belongs to the technical field of civil engineering structure reinforcement and repair, and particularly relates to a prestressed fiberboard tensioning end deviation rectifying type anchoring device and an anchoring method thereof.
Background
In recent years, the technology of reinforcing concrete structures by fiber materials is developed rapidly, and the fiber materials are widely applied to reinforcing engineering with unique advantages. The fiber sheet has high strength, but the modulus of elasticity is similar to that of steel, and the strength is exerted at the cost of deformation, so that the high strength is difficult to be sufficiently exerted. The research shows that: the prominent problem can be well solved by adopting the prestressed fiber sheet material reinforcing technology.
The existing prestressed fiber sheet anchorage mainly comprises three types of wave anchors, clip anchors and flat anchors, but no matter what anchorage is adopted for reinforcement, a jack is required to be used for tensioning when prestress is applied to a fiber sheet, and due to the fact that the jack has a certain size, the actual reinforcement is limited by the site space position, and deep grooving treatment cannot be carried out on the jack. In summary, the existing prestressed fiber sheet tensioning technology has the following outstanding disadvantages: in the existing prestressed fiber plate tensioning and anchoring device, after the prestress of the fiber plate is applied, an anchorage at a tensioning end is usually directly anchored by a tensioning guide rod matched with a high-strength bolt, and the tensioning guide rod is easily affected by the erosion of the external environment after being used for a long time, so that the prestress loss of the fiber plate is easily caused, and the reinforcing effect is reduced; the gravity center of the jack is inconsistent with that of the tensioning guide rod, and the tensioning guide rod, the tensioning reaction frame and the like are easy to bend and deform in the tensioning process, so that adverse effects are caused on the prestress application of the fiber sheet.
Disclosure of Invention
In order to overcome the defects of the existing prestressed fiberboard tensioning end anchoring method, the invention provides a prestressed fiberboard tensioning end deviation-correcting type anchoring device and an anchoring method thereof, wherein the prestressed fiberboard tensioning end deviation-correcting type anchoring device adopts fiberboard tensioning elongation to control the applied prestress value and ensure that a tensioning guide rod and a tensioning reaction frame are kept in a good state.
In order to achieve the purpose, the invention adopts the following specific scheme: a prestressed fiberboard tensioning end deviation rectifying type anchoring device comprises a tensioning end anchorage device 4, a tensioning reaction frame 9, a tensioning guide rod 7, a tensioning baffle 12 and a jack 11;
the right end of a prestressed fiberboard 1 is clamped in a tensioning end anchorage device 4, two tensioning guide rods 7 are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device 4, a tensioning reaction frame 9 and a tensioning baffle plate 12 are sequentially sleeved on the two tensioning guide rods 7 from left to right in a penetrating manner, two ends of each tensioning guide rod 7 are respectively in threaded connection with a left locking nut 2 and a right locking nut 13, the right end of each left locking nut 2 is in contact with the left end face of the tensioning end anchorage device 4, and the left end of each right locking nut 13 is in contact with the left surface of the tensioning baffle plate 12; the body of the jack 11 and the end part of the piston rod are respectively matched with the right end of the tensioning reaction frame 9 and the left surface of the tensioning baffle plate 12 in a jacking manner; a deviation rectifying mechanism positioned below the jack 11 is arranged between the tensioning end anchorage device and the tensioning baffle 12;
an anchoring connection structure is correspondingly arranged between the right side of the tensioning end anchorage device 4 and the left side of the tensioning reaction frame 9;
the tensioning reaction frame 9 comprises an L-shaped plate-shaped structure consisting of a fixed plate 17 and a bearing plate 18, the right end edge of the fixed plate 17 is fixedly connected with the upper end edge of the bearing plate 18, the front part and the rear part of the fixed plate 17 are respectively provided with a right guide hole 16 for penetrating a tensioning guide rod 7 along the left-right horizontal direction, the fixed plate 17 is fixedly connected to the lower surface of the civil engineering structure beam through a second high-strength bolt 10, and the right side surface of the bearing plate 18 is in top pressure fit with the end part of a piston rod of a jack 11;
the deviation correcting mechanism comprises a tensioning eccentric adjusting rod 24, a left adjusting nut 25, a right adjusting nut 26, a spiral pressure spring 27 and a stop block 28, wherein the tensioning eccentric adjusting rod 24 is parallel to a tensioning guide rod 7, the right end of the tensioning eccentric adjusting rod 24 penetrates through a tensioning baffle 12, the right adjusting nut 26 is in threaded connection with the right end of the tensioning eccentric adjusting rod 24 and is in contact with the right side face of the tensioning baffle 12, the left end of the tensioning eccentric adjusting rod 24 penetrates through a bearing plate 18, the spiral pressure spring 27 and the stop block 28 are both sleeved on the tensioning eccentric adjusting rod 24, the left adjusting nut 25 is in threaded connection with the left end of the tensioning eccentric adjusting rod 24 and is in contact with the left end face of the stop block 28, and the left end and the right end of the spiral pressure spring 27 are in top press fit with the right end face of the stop block 28 and the left side face of the bearing plate 18 respectively.
The tensioning end anchorage device 4 comprises an upper anchoring plate 14 and a lower anchoring plate 15, the right end of the prestressed fiberboard 1 is clamped between the upper anchoring plate 14 and the lower anchoring plate 15, the upper anchoring plate 14 and the lower anchoring plate 15 are fixedly connected through a plurality of first high-strength bolts 5 arranged in an array manner, and the front part and the rear part of a binding surface between the upper anchoring plate 14 and the lower anchoring plate 15 are respectively provided with a left guide hole 3 used for penetrating a tensioning guide rod 7 in the left-right horizontal direction;
the lower surface of the upper anchoring plate 14 and the upper surface of the lower anchoring plate 15 are uniformly provided with a plurality of anti-skidding insections, the length direction of each anti-skidding insection is perpendicular to the length direction of the prestressed fiberboard 1, the depth of each anti-skidding insection is 0.5mm, and the distance between every two adjacent anti-skidding insections is 4.8 mm.
Anchor connection structure includes a set of waist type hole 6 and a set of round hole 8 of in-band tapping, go up anchor board 14 and anchor board 15's left side border down and align, the length of going up anchor board 14 is less than anchor board 15's length down, a set of waist type hole 6 is from preceding then set up the right side portion at anchor board 15 down, the horizontal direction setting about all along is followed to the length direction in every waist type hole 6, a set of round hole 8 is from preceding then set up at fixed plate 17 left side portion, every waist type hole 6 all with a round hole 8 control correspond the setting.
The two sets of the deviation rectifying mechanisms are arranged on the same horizontal plane;
rigidity coefficient of the helical compression spring 27
WhereinE、AAndlrespectively expressed as modulus of elasticity, cross-sectional area and length of the fibrous sheet.
The two sets of the deviation rectifying mechanisms are arranged on the same horizontal plane; the rigidity coefficient of the helical compression spring 27 is determined by comprehensively considering the deformation of the fiber sheet, the tensioning guide rod 7 and the tensioning eccentric adjusting rod 24.
An anchoring method of a prestressed fiberboard tensioning end deviation rectifying type anchoring device comprises the following steps:
1) cutting out the prestressed fiberboard 1: the prestressed fiber plate 1 with the proper length is cut according to the length of the civil engineering structure beam, and the dimension specification of the prestressed fiber plate 1 is as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing an upper anchoring plate 14 and a lower anchoring plate 15 of the anchorage device 4 at the tensioning end, wherein the length of the upper anchoring plate 14 is 220mm, the length of the lower anchoring plate 15 is 240mm, and the thicknesses of the upper anchoring plate 14 and the lower anchoring plate 15 are both 12 mm;
processing and manufacturing a tension reaction frame 9, and integrally bending an L-shaped plate-shaped structure consisting of a fixing plate 17 and a bearing plate 18 of the tension reaction frame 9;
processing and manufacturing two tensioning guide rods 7, wherein the diameter and the length of each tensioning guide rod 7 are respectively 12mm and 1 m;
processing and manufacturing a tensioning eccentric adjusting rod 24 and a stop block 28 of the deviation correcting mechanism;
3) clamping the left end of the prestressed fiber plate 1 to the lower surface of the left side of the civil engineering structure beam by using a fixed anchorage; placing the left end of the prestressed fiberboard 1 between an upper anchoring plate 14 and a lower anchoring plate 15 of a tensioning-end anchorage device 4, dividing anti-skid insections on the surfaces of the upper anchoring plate 14 and the lower anchoring plate 15 to enhance the fastening friction force with the prestressed fiberboard 1, and screwing up a first high-strength bolt 5 to enable the upper anchoring plate 14 and the lower anchoring plate 15 to clamp the prestressed fiberboard 1;
then installing a tension reaction frame 9: for the determination of the position of the tension reaction frame 9, the prestress value applied to the prestressed fiber board 1 is set to be 30% of the ultimate strength, the elongation of the prestressed fiber board 1 is set to be 1.7%, and the actual elongation of the prestressed fiber board 1 is calculated to be
Measuring 5.1cm along a right tensioning direction from an initial position of one end of the tensioning end anchorage device 4 close to the jack 11, wherein the position is an installation position of the tensioning reaction frame 9, and fixedly connecting the fixing plate 17 to the lower surface of the civil engineering structure beam by using a second high-strength bolt 10;
4) and installing a tension end power driving mechanism: two tensioning guide rods 7 are inserted into the left guide hole 3 and the right guide hole 16, a tensioning baffle plate 12 is inserted into the right ends of the two tensioning guide rods 7, a jack 11 is placed between the tensioning reaction frame 9 and the tensioning baffle plate 12, a left locking nut 2 is screwed on the left ends of the two tensioning guide rods 7, and a right locking nut 13 is screwed on the right ends of the two tensioning guide rods 7;
5) and installing a deviation rectifying mechanism: two tensioning eccentric adjusting rods 24 penetrate between the tensioning baffle plate 12 and the bearing plate 18, a right adjusting nut 26 is screwed on the right end of the tensioning eccentric adjusting rod 24, a spiral pressure spring 27 and a stop block 28 are sequentially sleeved on the tensioning eccentric adjusting rod 24, a left adjusting nut 25 is screwed on the left end of the tensioning eccentric adjusting rod 24, and the jacking pressure of the two ends of the spiral pressure spring 27 and the top pressure of the right end face of the stop block 28 and the left side face of the bearing plate 18 are adjusted;
6) stretching the prestressed fiber board 1: the jack 11 is connected to a hydraulic station through a hydraulic pipeline to drive the jack 11, the jack 11 pushes the tensioning baffle 12, the tensioning baffle 12 drives the tensioning end anchorage device 4 to synchronously move rightwards through the tensioning guide rod 7, under the jacking action of the two ends of the spiral pressure spring 27 on the right end surface of the stop block 28 and the left side surface of the bearing plate 18, the central line of the jack 11 is always kept parallel to the tensioning guide rod 7, so that the influence of bending deformation caused by eccentric stress of the tensioning guide rod 7 on the prestress value applied to the fiber sheet is avoided, thereby realizing the tension of the prestressed fiber board 1, when a group of waist-shaped holes 6 on the lower anchoring plate 15 of the anchorage device 4 at the tension end is covered on a group of round holes 8 on the fixing plate 17 of the tension reaction frame 9 in the tension process, checking the reading of a hydraulic meter on the hydraulic station and synchronously pressurizing or unloading the jack 11 to finely adjust the tension value, and finishing the prestress application to the prestressed fiber board 1 after the correction is correct;
7) fixing the tension end anchorage device 4: keeping the jack 11 in a load holding state, aligning the superposed position of the waist-shaped hole 6 reserved on the tensioning end anchorage device 4 and the round hole 8 on the tensioning reaction frame 9, connecting the third high-strength bolt 19 with the round hole 8, screwing the third high-strength bolt 19, filling the redundant part in the waist-shaped hole 6 with a U-shaped key to complete the fixation of the tensioning end anchorage device 4, and then unloading and dismantling the jack 11, the tensioning guide rod 7 and the tensioning baffle plate 12.
In conclusion, the method is suitable for the field of civil engineering structure repair, and has the following outstanding advantages compared with the existing prestressed fiberboard tensioning end anchoring method:
1. the invention utilizes the linear relation between the tensile force and the elongation of the fiber board to position and install the tension reaction frame; the adopted tensioning end anchoring device realizes effective control of prestress tensioning through elongation control of the prestress fiber board, so that the prestress application process of the fiber board is more convenient.
2. The tensioning end anchorage device is not fixed by a tensioning guide rod, a waist-shaped hole is preset on a lower anchoring plate of the tensioning end anchorage device, and a third high-strength bolt is used for connecting the tensioning end anchorage device with an inner tapping round hole reserved in a fixing plate of a tensioning reaction frame after the fiber plate is prestressed. The long-term prestress of the fiber board can be effectively ensured by adopting the anchoring method, the anchoring method is more stable and reliable, the tensioning guide rod can be detached after the prestress tensioning of the fiber board is finished, the problem of insufficient durability commonly existing in the conventional method for anchoring the tensioning guide rod at the tensioning end of the prestressed fiber board is solved, and the problems that the tensioning guide rod is easily influenced by the external environment after being in service for a long time and the prestress loss of the fiber board is overlarge once being corroded are effectively solved.
3. During traditional common tensioning, because the jack has certain size, the gravity center of the jack is inconsistent with that of the tensioning guide rod, the problems that the deformation of the tensioning guide rod and a bearing plate of the tensioning reaction frame is caused along with the gradual increase of the tensioning force, the deformation of a part of the tensioning baffle far away from the tensioning guide rod is delayed and the like can occur, and even the instability phenomenon of the jack can occur in severe cases. The tensioning deviation rectifying mechanism is beneficial to inhibiting the deformation of the bearing plate of the tensioning reaction frame, and the tensioning baffle can integrally move synchronously along with the extension deformation of the tensioning guide rod, so that the jack can stably apply prestress on the fiber sheet.
4. The correction mechanism has the characteristics of simple operation, detachability, reusability and the like of the tensioning eccentric adjusting rod and the helical compression spring, can greatly reduce the actual reinforcing cost and the construction difficulty, improves the stress condition of the tensioning reaction frame vertical plate, and ensures that the tensioning guide rod is more reasonable in stress in the tensioning process; the problem of among the current prestressing force fiber sheet reinforcement technique, jack focus and stretch-draw guide rod focus are inconsistent, lead to stretch-draw guide rod to take place eccentric atress and produce bending deformation in the tensioning process, exert the prestressing force value and cause the influence to the fiber sheet is solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic bottom view of the device of FIG. 1 without the deviation mechanism and prior to anchoring;
FIG. 3 is a schematic bottom view of the anchor of FIG. 1;
FIG. 4 is an enlarged view of the tension end anchor of FIG. 1;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is an enlarged view of the tensioned reaction frame of FIG. 1;
fig. 7 is a sectional view taken along line B-B in fig. 6.
Detailed Description
As shown in fig. 1-7, the prestressed fiberboard tensioning end deviation rectifying type anchoring device of the present invention comprises a tensioning end anchorage 4, a tensioning reaction frame 9, a tensioning guide rod 7, a tensioning baffle 12 and a jack 11;
the right end of a prestressed fiberboard 1 is clamped in a tensioning end anchorage device 4, two tensioning guide rods 7 are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device 4, a tensioning reaction frame 9 and a tensioning baffle plate 12 are sequentially sleeved on the two tensioning guide rods 7 from left to right in a penetrating manner, two ends of each tensioning guide rod 7 are respectively in threaded connection with a left locking nut 2 and a right locking nut 13, the right end of each left locking nut 2 is in contact with the left end face of the tensioning end anchorage device 4, and the left end of each right locking nut 13 is in contact with the left surface of the tensioning baffle plate 12; the body of the jack 11 and the end part of the piston rod are respectively matched with the right end of the tensioning reaction frame 9 and the left surface of the tensioning baffle plate 12 in a jacking manner; a deviation rectifying mechanism positioned below the jack 11 is arranged between the tensioning end anchorage device 4 and the tensioning baffle 12.
An anchoring connection structure is correspondingly arranged between the right side of the tensioning end anchorage device 4 and the left side of the tensioning reaction frame 9.
The tensioning reaction frame 9 comprises an L-shaped plate-shaped structure formed by a fixing plate 17 and a bearing plate 18, the right end edge of the fixing plate 17 is fixedly connected with the upper end edge of the bearing plate 18, the front part and the rear part of the fixing plate 17 are respectively provided with a right guide hole 16 used for penetrating through the tensioning guide rod 7 along the left-right horizontal direction, the fixing plate 17 is fixedly connected to the lower surface of the civil engineering structure beam 30 through a second high-strength bolt 10, and the right side surface of the bearing plate 18 is in top pressure fit with the end part of a piston rod of the jack 11.
The deviation correcting mechanism comprises a tensioning eccentric adjusting rod 24, a left adjusting nut 25, a right adjusting nut 26, a spiral pressure spring 27 and a stop block 28, wherein the tensioning eccentric adjusting rod 24 is parallel to a tensioning guide rod 7, the right end of the tensioning eccentric adjusting rod 24 penetrates through a tensioning baffle 12, the right adjusting nut 26 is in threaded connection with the right end of the tensioning eccentric adjusting rod 24 and is in contact with the right side face of the tensioning baffle 12, the left end of the tensioning eccentric adjusting rod 24 penetrates through a bearing plate 18, the spiral pressure spring 27 and the stop block 28 are both sleeved on the tensioning eccentric adjusting rod 24, the left adjusting nut 25 is in threaded connection with the left end of the tensioning eccentric adjusting rod 24 and is in contact with the left end face of the stop block 28, and the left end and the right end of the spiral pressure spring 27 are in top press fit with the right end face of the stop block 28 and the left side face of the bearing plate 18 respectively.
Stretch-draw end ground tackle 4 includes anchor plate 14 and anchor plate 15 down, and the centre gripping of 1 right-hand member of prestressing force fibreboard is between last anchor plate 14 and anchor plate 15 down, goes up anchor plate 14 and anchor plate 15 down between through the first high-strength bolt 5 fastening connection that a plurality of array arranged, goes up anchor plate 14 and anchor plate 15 between anterior and the rear portion of binding face all be equipped with one along controlling the horizontal direction and be used for wearing to establish left guiding hole 3 of stretch-draw guide arm 7.
The lower surface of the upper anchoring plate 14 and the upper surface of the lower anchoring plate 15 are uniformly provided with a plurality of anti-skidding insections, the length direction of each anti-skidding insection is perpendicular to the length direction of the prestressed fiberboard 1, the depth of each anti-skidding insection is 0.5mm, and the distance between every two adjacent anti-skidding insections is 4.8 mm.
Anchor connection structure includes a set of waist type hole 6 and a set of round hole 8 of in-band tapping, go up anchor board 14 and anchor board 15's left side border down and align, the length of going up anchor board 14 is less than anchor board 15's length down, a set of waist type hole 6 is from preceding then set up the right side portion at anchor board 15 down, the horizontal direction setting about all along is followed to the length direction in every waist type hole 6, a set of round hole 8 is from preceding then set up at fixed plate 17 left side portion, every waist type hole 6 all with a round hole 8 control correspond the setting.
The two sets of deviation rectifying mechanisms are arranged and are positioned on the same horizontal plane; rigidity coefficient of the helical compression spring 27
WhereinE、AAndlrespectively expressed as modulus of elasticity, cross-sectional area and length of the fibrous sheet. Or the rigidity coefficient of the helical compression spring 27 is determined by comprehensively considering the deformation of the fiber sheet, the tensioning guide rod 7 and the tensioning eccentric adjusting rod 24.
An anchoring method of a prestressed fiberboard tensioning end deviation rectifying type anchoring device comprises the following steps:
1) cutting out the prestressed fiber board 1: the prestressed fiber plate 1 with the proper length is cut according to the length of the civil engineering structure beam, and the dimension specification of the prestressed fiber plate 1 is as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing an upper anchoring plate 14 and a lower anchoring plate 15 of the anchorage device 4 at the tensioning end, wherein the length of the upper anchoring plate 14 is 220mm, the length of the lower anchoring plate 15 is 240mm, and the thicknesses of the upper anchoring plate 14 and the lower anchoring plate 15 are both 12 mm;
processing and manufacturing a tension reaction frame 9, and integrally bending an L-shaped plate-shaped structure consisting of a fixing plate 17 and a bearing plate 18 of the tension reaction frame 9;
processing and manufacturing two tensioning guide rods 7, wherein the diameter and the length of each tensioning guide rod 7 are respectively 12mm and 1 m;
processing and manufacturing a tensioning eccentric adjusting rod 24 and a stop block 28 of the deviation correcting mechanism;
3) clamping the left end of the prestressed fiber plate 1 to the lower surface of the left side of the civil engineering structure beam 30 by using a fixed anchorage device 31; placing the left end of the prestressed fiberboard 1 between an upper anchoring plate 14 and a lower anchoring plate 15 of a tensioning-end anchorage device 4, dividing anti-skid insections on the surfaces of the upper anchoring plate 14 and the lower anchoring plate 15 to enhance the fastening friction force with the prestressed fiberboard 1, and screwing up a first high-strength bolt 5 to enable the upper anchoring plate 14 and the lower anchoring plate 15 to clamp the prestressed fiberboard 1;
then installing a tension reaction frame 9: for the determination of the position of the tension reaction frame 9, the prestress value applied to the prestressed fiber board 1 is set to be 30 percent of the ultimate strength, the elongation of the prestressed fiber board 1 is set to be 1.7 percent, and the actual elongation of the prestressed fiber board 1 is calculated to be
Measuring 5.1cm along a right tensioning direction from an initial position of one end of the tensioning end anchorage device 4 close to the jack 11, wherein the position is an installation position of the tensioning reaction frame 9, and fixedly connecting the fixing plate 17 to the lower surface of the civil engineering structure beam by using a second high-strength bolt 10;
4) and installing a tension end power driving mechanism: two tensioning guide rods 7 are inserted into the left guide hole 3 and the right guide hole 16, a tensioning baffle plate 12 is inserted into the right ends of the two tensioning guide rods 7, a jack 11 is placed between the tensioning reaction frame 9 and the tensioning baffle plate 12, a left locking nut 2 is screwed on the left ends of the two tensioning guide rods 7, and a right locking nut 13 is screwed on the right ends of the two tensioning guide rods 7;
5) and installing a deviation rectifying mechanism: two tensioning eccentric adjusting rods 24 penetrate between the tensioning baffle plate 12 and the bearing plate 18, a right adjusting nut 26 is screwed on the right end of the tensioning eccentric adjusting rod 24, a spiral pressure spring 27 and a stop block 28 are sequentially sleeved on the tensioning eccentric adjusting rod 24, a left adjusting nut 25 is screwed on the left end of the tensioning eccentric adjusting rod 24, and the jacking pressure of the two ends of the spiral pressure spring 27 and the top pressure of the right end face of the stop block 28 and the left side face of the bearing plate 18 are adjusted;
6) stretching the prestressed fiber board 1: the jack 11 is connected to a hydraulic station through a hydraulic pipeline to drive the jack 11, the jack 11 pushes the tensioning baffle 12, the tensioning baffle 12 drives the tensioning end anchorage device 4 to synchronously move rightwards through the tensioning guide rod 7, under the jacking action of the two ends of the spiral pressure spring 27 on the right end surface of the stop block 28 and the left side surface of the bearing plate 18, the central line of the jack 11 is always kept parallel to the tensioning guide rod 7, so that the influence of bending deformation caused by eccentric stress of the tensioning guide rod 7 on the prestress value applied to the fiber sheet is avoided, thereby realizing the tension of the prestressed fiber board 1, when a group of waist-shaped holes 6 on the lower anchoring plate 15 of the anchorage device 4 at the tensioning end covers a group of round holes 8 on the fixing plate 17 of the tension reaction frame 9 in the tensioning process, checking the reading of a hydraulic gauge on the hydraulic station and synchronously pressurizing or unloading the jack 11 to finely adjust the tension value, and finishing the prestress application to the prestressed fiber board 1 after the correction is correct;
7) fixing the tension end anchorage device 4: keeping the jack 11 in a load holding state, aligning the superposed position of the waist-shaped hole 6 reserved on the tensioning end anchorage device 4 and the round hole 8 on the tensioning reaction frame 9, connecting the third high-strength bolt 19 with the round hole 8, screwing the third high-strength bolt 19, filling the redundant part in the waist-shaped hole 6 with a U-shaped key to complete the fixation of the tensioning end anchorage device 4, and then unloading and dismantling the jack 11, the tensioning guide rod 7 and the tensioning baffle plate 12.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a prestressing force fibreboard stretch-draw end formula anchor of rectifying which characterized in that: comprises a tensioning end anchorage device (4), a tensioning reaction frame (9), a tensioning guide rod (7), a tensioning baffle plate (12) and a jack (11);
the right end of the prestressed fiberboard (1) is clamped in a tensioning end anchorage device (4), two tensioning guide rods (7) are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device (4), a tensioning reaction frame (9) and a tensioning baffle (12) sequentially penetrate and sleeve the two tensioning guide rods (7) from left to right, two ends of each tensioning guide rod (7) are respectively in threaded connection with a left locking nut (2) and a right locking nut (13), the right end of each left locking nut (2) is in contact with the left end face of the tensioning end anchorage device (4), and the left end of each right locking nut (13) is in contact with the left surface of the tensioning baffle (12); the body of the jack (11) and the end part of the piston rod are respectively in top pressing fit with the right end of the tensioning reaction frame (9) and the left surface of the tensioning baffle plate (12); a deviation rectifying mechanism positioned below the jack (11) is arranged between the tensioning end anchorage device and the tensioning baffle (12);
an anchoring connection structure is correspondingly arranged between the right side of the tensioning end anchorage device (4) and the left side of the tensioning reaction frame (9);
the tensioning reaction frame (9) comprises an L-shaped plate-shaped structure formed by a fixing plate (17) and a bearing plate (18), the right end edge of the fixing plate (17) is fixedly connected with the upper end edge of the bearing plate (18), the front part and the rear part of the fixing plate (17) are respectively provided with a right guide hole (16) used for penetrating a tensioning guide rod (7) in the left-right horizontal direction, the fixing plate (17) is fixedly connected to the lower surface of the civil engineering structure beam through a second high-strength bolt (10), and the right side surface of the bearing plate (18) is in top pressing fit with the end part of a piston rod of a jack (11);
the deviation rectifying mechanism comprises a tensioning eccentric adjusting rod (24) and a left adjusting nut (25), the tensioning eccentric adjusting rod is characterized by comprising a right adjusting nut (26), a spiral pressure spring (27) and a stop block (28), wherein a tensioning eccentric adjusting rod (24) is parallel to a tensioning guide rod (7), the right end of the tensioning eccentric adjusting rod (24) penetrates through a tensioning baffle plate (12), the right adjusting nut (26) is in threaded connection with the right end of the tensioning eccentric adjusting rod (24) and is in contact with the right side face of the tensioning baffle plate (12), the left end of the tensioning eccentric adjusting rod (24) penetrates through a bearing plate (18), the spiral pressure spring (27) and the stop block (28) are sleeved on the tensioning eccentric adjusting rod (24), the left adjusting nut (25) is in threaded connection with the left end of the tensioning eccentric adjusting rod (24) and is in contact with the left end face of the stop block (28), and the left end and the right end of the spiral pressure spring (27) are in top press fit with the right end face of the stop block (28) and the left side face of the bearing plate (18) respectively;
the tensioning end anchorage device (4) comprises an upper anchoring plate (14) and a lower anchoring plate (15), the right end of the prestressed fiberboard (1) is clamped between the upper anchoring plate (14) and the lower anchoring plate (15), the upper anchoring plate (14) and the lower anchoring plate (15) are fixedly connected through a plurality of first high-strength bolts (5) arranged in an array manner, and the front part and the rear part of a binding surface between the upper anchoring plate (14) and the lower anchoring plate (15) are respectively provided with a left guide hole (3) used for penetrating a tensioning guide rod (7) in the left-right horizontal direction;
the lower surface of the upper anchoring plate (14) and the upper surface of the lower anchoring plate (15) are uniformly provided with a plurality of anti-skidding insections, the length direction of each anti-skidding insection is perpendicular to the length direction of the prestressed fiberboard (1), the depth of each anti-skidding insection is 0.5mm, and the distance between every two adjacent anti-skidding insections is 4.8 mm.
2. The prestressed fiberboard tensioning end deviation rectifying type anchoring device according to claim 1, wherein: anchor connection structure includes round hole (8) of a set of waist type hole (6) and a set of in-band tapping, go up anchor plate (14) and the left side border of anchor plate (15) down and align, the length of going up anchor plate (14) is less than the length of anchor plate (15) down, the right part of anchor plate (15) is seted up in a set of waist type hole (6) from preceding then, the length direction of every waist type hole (6) all sets up along controlling the horizontal direction, a set of round hole (8) are seted up in fixed plate (17) left part from preceding then, every waist type hole (6) all control with a round hole (8) and correspond the setting.
3. The prestressed fiberboard tensioning end deviation rectifying type anchoring device as claimed in claim 2, wherein: the two sets of the deviation rectifying mechanisms are arranged on the same horizontal plane;
rigidity coefficient of the helical compression spring (27)
WhereinE、AAndlrespectively expressed as modulus of elasticity, cross-sectional area and length of the fibrous sheet.
4. The prestressed fiberboard tensioning end deviation rectifying type anchoring device as claimed in claim 3, wherein: the two sets of the deviation rectifying mechanisms are arranged on the same horizontal plane; the rigidity coefficient of the spiral pressure spring (27) is determined by comprehensively considering the deformation of the fiber sheet, the tensioning guide rod (7) and the tensioning eccentric adjusting rod (24).
5. The anchoring method of an anchoring device according to claim 4, wherein: the method comprises the following steps:
1) cutting out the prestressed fiber board (1): the prestressed fiber board (1) with proper length is cut according to the length of the civil engineering structure beam, and the dimension specification of the prestressed fiber board (1) is as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing an upper anchoring plate (14) and a lower anchoring plate (15) of the anchorage device (4) at the tensioning end, wherein the length of the upper anchoring plate (14) is 220mm, the length of the lower anchoring plate (15) is 240mm, and the thicknesses of the upper anchoring plate (14) and the lower anchoring plate (15) are both 12 mm;
processing and manufacturing a tensioning reaction frame (9), and integrally bending an L-shaped plate-shaped structure consisting of a fixing plate (17) and a bearing plate (18) of the tensioning reaction frame (9);
processing and manufacturing two tensioning guide rods (7), wherein the diameter and the length of each tensioning guide rod (7) are respectively 12mm and 1 m;
processing and manufacturing a tensioning eccentric adjusting rod (24) and a stop block (28) of the deviation correcting mechanism;
3) clamping the left end of the prestressed fiber plate (1) to the lower surface of the left side of the civil engineering structure beam by using a fixed anchorage; placing the left end of the prestressed fiber plate (1) between an upper anchoring plate (14) and a lower anchoring plate (15) of a tensioning end anchorage device (4), dividing anti-skidding insections on the surfaces of the upper anchoring plate (14) and the lower anchoring plate (15) to enhance the fastening friction force with the prestressed fiber plate (1), and screwing up a first high-strength bolt (5) to enable the upper anchoring plate (14) and the lower anchoring plate (15) to clamp the prestressed fiber plate (1);
then installing a tension reaction frame (9): for the determination of the position of the tensioning reaction frame (9), setting a prestress value applied to the prestressed fiber plate (1) to be 30% of the ultimate strength, and the elongation rate of the prestressed fiber plate (1) to be 1.7%, calculating to obtain the actual elongation of the prestressed fiber plate (1), measuring 5.1cm along the right tensioning direction by using an initial position of one end of a tensioning end anchorage device (4) close to a jack (11), wherein the initial position is the installation position of the tensioning reaction frame (9), and fixedly connecting a fixing plate (17) to the lower surface of the civil engineering structure beam by using a second high-strength bolt (10);
4) and installing a tension end power driving mechanism: two tensioning guide rods (7) are penetrated into a left guide hole (3) and a right guide hole (16), a tensioning baffle (12) is penetrated to the right ends of the two tensioning guide rods (7), a jack (11) is placed between a tensioning reaction frame (9) and the tensioning baffle (12), a left locking nut (2) is screwed at the left ends of the two tensioning guide rods (7), and a right locking nut (13) is screwed at the right ends of the two tensioning guide rods (7);
5) and installing a deviation rectifying mechanism: two tensioning eccentric adjusting rods (24) penetrate between a tensioning baffle plate (12) and a bearing plate (18), a right adjusting nut (26) is screwed on the right end of each tensioning eccentric adjusting rod (24), a spiral pressure spring (27) and a stop block (28) are sequentially sleeved on the tensioning eccentric adjusting rods (24), a left adjusting nut (25) is screwed on the left end of each tensioning eccentric adjusting rod (24), and the two ends of each spiral pressure spring (27) are respectively pressed against the right end face of the stop block (28) and the left side face of the bearing plate (18);
6) and a tension prestressed fiber board (1): the jack (11) is connected to a hydraulic station through a hydraulic pipeline to drive the jack (11), the jack (11) pushes a tensioning baffle (12), the tensioning baffle (12) drives a tensioning end anchorage device (4) to synchronously move rightwards through a tensioning guide rod (7), under the jacking action of two ends of a helical compression spring (27) on the right end surface of a stop block (28) and the left side surface of a bearing plate (18), the central line of the jack (11) is always parallel to the tensioning guide rod (7), the influence of bending deformation generated by eccentric stress of the tensioning guide rod (7) in the tensioning process on the prestress value applied to a fiber sheet is avoided, so that the tensioning of the prestress fiber plate (1) is realized, when a group of kidney-shaped holes (6) on a lower anchoring plate (15) of the tensioning end anchorage device (4) is found to cover a group of round holes (8) on a fixing plate (17) of a tensioning reaction frame (9) in the tensioning process, reading of a hydraulic gauge on the hydraulic station is checked, the jack (11) is synchronously pressurized or unloaded to finely adjust the tension value, and the prestress application to the prestressed fiber board (1) is completed after the correction is correct;
7) and a fixed tensioning end anchorage device (4): keeping a jack (11) in a load holding state, aligning a waist-shaped hole (6) reserved on a tensioning end anchorage device (4) to a position overlapped with a round hole (8) on a tensioning reaction frame (9), connecting a third high-strength bolt (19) with the round hole (8), after the third high-strength bolt (19) is screwed down, filling redundant parts in the waist-shaped hole (6) with U-shaped keys to finish fixing the tensioning end anchorage device (4), and then unloading and dismantling the jack (11), a tensioning guide rod (7) and a tensioning baffle (12).
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| CN201611244003.5A CN106760608B (en) | 2016-12-29 | 2016-12-29 | Prestressed fiberboard tensioning end deviation rectifying type anchoring device and anchoring method thereof |
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| GB2568537B (en) * | 2017-11-20 | 2020-07-29 | Ahmed Abubaker Kiari Mohamed | Support for a structure |
| CN111188286B (en) * | 2020-01-13 | 2021-04-30 | 上海悍马建筑科技有限公司 | Method for disassembling bonded prestressed carbon fiber plate |
| CN112282411A (en) * | 2020-09-30 | 2021-01-29 | 中国建筑第八工程局有限公司 | Beam bending shear reinforcing equipment utilizing prestressed carbon fiber cloth and reinforcing method thereof |
| CN114428015B (en) * | 2022-01-06 | 2024-02-06 | 中国建筑第八工程局有限公司 | Device and method for testing prestress loss of carbon fiber reinforced composite bar |
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| US8925267B1 (en) * | 2014-06-24 | 2015-01-06 | Patrick C. Kirby | Brace for wall with adjustable monitor |
| CN203782591U (en) * | 2014-03-12 | 2014-08-20 | 安徽坤大化学锚固有限公司 | Automatic tensioning anchor system for composite board pre-stressing force |
| CN205206350U (en) * | 2015-10-26 | 2016-05-04 | 四川省建筑科学研究院 | Prestressing force carbon fiber plate stretch -draw anchor |
| CN206458119U (en) * | 2016-12-29 | 2017-09-01 | 华北水利水电大学 | A kind of pre-stress fibre plate stretching end correction formula anchor |
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