CN106760609B - Combined assembly deviation-rectifying type prestressed fiber sheet tensioning device and construction method thereof - Google Patents
Combined assembly deviation-rectifying type prestressed fiber sheet tensioning device and construction method thereof Download PDFInfo
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- CN106760609B CN106760609B CN201611246774.8A CN201611246774A CN106760609B CN 106760609 B CN106760609 B CN 106760609B CN 201611246774 A CN201611246774 A CN 201611246774A CN 106760609 B CN106760609 B CN 106760609B
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Abstract
The combined assembly deviation-rectifying type prestressed fiber sheet tensioning device comprises a tensioning end anchorage device, a tensioning reaction frame, a tensioning guide rod, a tensioning baffle and a jack; the tensioning end anchorage device comprises a U-shaped plate, an upper anchoring plate and a lower anchoring plate, the right end of the prestressed fiber sheet is clamped between the upper anchoring plate and the lower anchoring plate, the tensioning reaction frame comprises a connecting plate, a fixed plate and a bearing plate, and an anchoring connection structure is correspondingly arranged between the right side of the tensioning end anchorage device and the left side of the tensioning reaction frame. The invention also discloses a construction method of the combined assembly deviation-correcting type prestressed fiber sheet tensioning device. The invention makes the center of gravity of the tensioning guide rod and the center of gravity of the prestressed fiber sheet basically consistent, and solves the problem of eccentric stress in the tensioning process of the prestressed fiber sheet. The tensioning reaction frame, the U-shaped plate and the tensioning end anchorage are connected in an assembling manner, so that the installation is convenient and fast, the repeated utilization is realized, and the engineering cost is reduced; the stress condition of the vertical plate of the tension reaction frame is improved, so that the stress of the tension guide rod in the tension process is more reasonable.
Description
Technical Field
The invention belongs to the technical field of civil engineering structure reinforcement and repair, and particularly relates to a combined assembly deviation rectifying type prestressed fiber sheet tensioning device and a construction method thereof.
Background
In recent years, fiber sheets (including carbon fibers, basalt fibers and the like) have become a research and application hotspot in the field of civil engineering structure reinforcement and repair due to the unique advantages of light weight, high strength, corrosion resistance and convenient construction. The main disadvantage of the traditional reinforcing technology for sticking the fiber sheet is that the high strength characteristic of the fiber sheet cannot be exerted. A large number of researches show that the defect can be effectively overcome by applying prestress in advance before the fiber sheet is adhered, namely the strength utilization rate of the fiber sheet can be greatly improved after the prestress is applied to the fiber sheet.
In addition, 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 the fiber sheet, and due to the fact that the jack has a certain size, 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: 1) the gravity center of the jack is inconsistent with that of the tensioning guide rod, so that the tensioning guide rod, the tensioning reaction frame and the like are easy to bend and deform in the tensioning process, and adverse effects are caused on the prestress application of the fiber sheet; 2) eccentricity exists between the center of gravity of the tensioning guide rod and the center of gravity of the fiber sheet in the tensioning process of the fiber sheet, and the fiber sheet is easily damaged; 3) the tensioning reaction frame is heavy in structure and complex and tedious in operation, the whole tensioning reaction frame needs to be kept on the structure after reinforcement construction is finished, the tensioning reaction frame cannot be reused, and the attractiveness of the structure is affected.
Disclosure of Invention
In order to solve the defects of the existing prestressed fiber sheet tensioning end anchoring method, the invention provides the combined assembly deviation-correcting prestressed fiber sheet tensioning device and the construction method thereof, wherein the combined assembly deviation-correcting prestressed fiber sheet tensioning device has the advantages of compact structure and simplicity in assembly, ensures that the tensioning guide rod and the tensioning reaction frame are kept in a good state, is convenient to disassemble, assemble and reuse and can avoid the eccentric stress problem in the tensioning process.
In order to achieve the purpose, the invention adopts the following specific scheme: a combined assembly deviation-rectifying type prestressed fiber sheet tensioning device comprises a tensioning end anchorage device, a tensioning reaction frame, a tensioning guide rod 7, a tensioning baffle 12 and a jack 11;
the right end of the prestressed fiber sheet 1 is clamped in a tensioning end anchorage device, two tensioning guide rods 7 are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device, a tensioning reaction frame and a tensioning baffle plate 12 are sequentially sleeved on 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, 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 and the left surface of the tensioning baffle 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 anchorage device at the tensioning end and the left side of the tensioning reaction frame;
the tensioning reaction frame comprises a connecting plate 21, a fixing plate 17 and a bearing plate 18, wherein the front part and the rear part of the connecting plate 21 are respectively provided with a right guide hole 16 for penetrating a tensioning guide rod 7 along the left-right horizontal direction, the connecting plate 21 is fixedly connected to the lower surface of the civil engineering structure beam through a second high-strength bolt 10, the right end edge of the fixing plate 17 is fixedly connected with the upper end edge of the bearing plate 18 to form an L-shaped plate-shaped structure, the fixing plate 17 is fixedly arranged on the lower surface of the connecting plate 21 through a third high-strength bolt 22, and the right side surface of the bearing plate 18 is in top pressing 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.
The tensioning end anchorage comprises a U-shaped plate 19, an upper anchoring plate 14 and a lower anchoring plate 15, the right end of a prestressed fiber sheet 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, the open end of the U-shaped plate 19 is horizontally arranged rightwards, the front part and the rear part of the U-shaped plate 19 are respectively provided with a left guide hole 3 used for penetrating a tensioning guide rod 7 along the left-right horizontal direction, the upper anchoring plate 14 and the lower anchoring plate 15 are positioned in the U-shaped plate 19, the U-shaped inner wall of the U-shaped plate 19 is provided with a U-shaped positioning groove 23, the left side edge, the front side edge and the rear side edge of the upper anchoring plate 14 and the lower anchoring plate 15 are respectively positioned in the U-shaped positioning groove 23, the upper side surface of the middle part of the U-shaped plate 19 is provided with a groove 20 used for penetrating the prestressed fiber sheet 1, and the lower surface of the upper anchoring plate 14 and the lower anchoring plate 15 are uniformly provided with a plurality of anti-skid tooth grains, the length direction of each anti-skid insection is perpendicular to the length direction of the prestressed fiber sheet 1, the depth of each anti-skid insection is 0.5mm, and the distance between every two adjacent anti-skid 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 plate 14 and anchor plate 15's left side border down and align, the length of going up anchor plate 14 is less than anchor plate 15's length down, a set of waist type hole 6 is from preceding then set up the right side portion at anchor plate 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 connecting plate 21 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 combined assembly deviation-rectifying type prestressed fiber sheet tensioning device comprises the following steps:
1) cutting the prestressed fiber sheet 1: cutting a prestressed fiber sheet 1 with a proper length according to the length of the civil engineering structure beam, wherein the dimensions and specifications of the prestressed fiber sheet 1 are as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing a U-shaped plate 19, an upper anchoring plate 14 and a lower anchoring plate 15 of the anchorage device 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 connecting plate 21, a fixing plate 17 and a bearing plate 18 of the tension reaction frame, and integrally bending an L-shaped plate-shaped structure formed by the fixing plate 17 and the bearing plate 18 of the tension reaction frame;
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 sheet 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 a prestressed fiber sheet 1 between an upper anchoring plate 14 and a lower anchoring plate 15 of a tensioning-end anchorage device, enhancing the fastening friction force between the anti-skid insections on the surfaces of the upper anchoring plate 14 and the lower anchoring plate 15 and the prestressed fiber sheet 1, screwing a first high-strength bolt 5 to enable the upper anchoring plate 14 and the lower anchoring plate 15 to clamp the prestressed fiber sheet 1, pushing the upper anchoring plate 14 and the lower anchoring plate 15 into a U-shaped positioning groove 23 from an opening at the right end of a U-shaped plate 19 leftwards, and enabling the prestressed fiber sheet 1 to pass through a groove 20 on the upper side of the middle part of the prestressed fiber sheet 1;
then installing a tensioning reaction frame: for the determination of the position of the tension reaction frame, the prestress value applied to the prestressed fiber sheet 1 is set to be 30% of the ultimate strength, the elongation of the prestressed fiber sheet 1 is set to be 1.7%, and the actual elongation of the prestressed fiber sheet 1 is calculated to be
Measuring 5.1cm along a right tensioning direction from an initial position of one end of a tensioning end anchorage close to a jack 11, wherein the position is an installation position of a tensioning reaction frame, fixedly connecting a connecting plate 21 to the lower surface of the civil engineering structure beam by using a second high-strength bolt 10, and then fixedly arranging a fixing plate 17 on the lower surface of the connecting plate 21 by using a third high-strength bolt 22;
4) and installing a tension end power driving mechanism: penetrating two tensioning guide rods 7 into a left guide hole 3 and a right guide hole 16, penetrating a tensioning baffle plate 12 into the right ends of the two tensioning guide rods 7, placing a jack 11 between a bearing plate 18 and the tensioning baffle plate 12, screwing a left locking nut 2 on the left ends of the two tensioning guide rods 7, and screwing a right locking nut 13 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 sheet 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 U-shaped plate 19 of the tensioning end anchorage device to move rightwards through the tensioning guide rod 7, the upper anchoring plate 14 and the lower anchoring plate 15 synchronously move rightwards along with the U-shaped plate 19 under the limit of the U-shaped positioning groove 23 of the U-shaped plate 19, under the jacking action of two ends of a 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 parallel to the tensioning guide rod 7, the influence of bending deformation generated by eccentric stress of the tensioning guide rod 7 on the prestress value applied to the fiber sheet is avoided in the tensioning process, the tensioning of the prestress fiber sheet 1 is realized, when a group of kidney-shaped holes 6 on the lower anchoring plate 15 of the tensioning end anchorage device is found to cover a group of round holes 8 on a fixing plate 17 of a tensioning reaction frame 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 sheet 1 after the correction is correct;
7) fixing the tension end anchorage device: 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 and the round hole 8 on the connecting plate 21, connecting the fourth high-strength bolt with the round hole 8, screwing the fourth high-strength bolt, 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, and then unloading and dismantling the jack 11, the U-shaped plate 19, the tensioning guide rod 7, the deviation correcting mechanism 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 traditional prestressed fiber sheet tensioning end anchoring method:
1. the invention utilizes the linear relation between the tension force and the elongation of the prestressed fiber sheet material 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 sheet, so that the prestress application process of the fiber sheet is more convenient.
2. The tensioning end anchorage device is not fixed by a tensioning guide rod, a waist-shaped hole is preset in a lower anchoring plate of the tensioning end anchorage device, and after prestress is applied to a fiber sheet, the tensioning end anchorage device is connected with an inner tapping round hole reserved in a fixing plate of a tensioning reaction frame by using a fourth high-strength bolt. The long-term prestress of the fiber sheet 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 sheet 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 sheet 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 sheet is overlarge once the fiber sheet is corroded are effectively solved.
3. The prestressing force fiber sheet often meets and has eccentricity between stretch-draw guide arm focus and the prestressing force fiber sheet focus in the tensioning process, damages the condition of prestressing force fiber sheet, and the U template that this application adopted places the stretch-draw guide arm in the stretch-draw end ground tackle outside, makes stretch-draw guide arm focus and prestressing force fiber sheet focus keep unanimous basically, has effectively solved the eccentric atress problem in the prestressing force fiber sheet tensioning process.
4. The tension reaction frame is in assembled connection with the L-shaped plate-shaped structure formed by the connecting plate, the fixing plate and the bearing plate, and the support plate can be disassembled and reused after the tension of the prestressed fiber sheets is finished, so that the engineering cost is reduced.
5. The U-shaped plate and the tensioning end anchorage are in assembled connection, the installation is convenient, the U-shaped plate can be disassembled after the tensioning of the prestressed fiber sheet is finished, the U-shaped plate can be recycled, and the engineering cost is reduced. The U-shaped positioning groove 23 is arranged to limit the position of the tensioning end anchorage device, so that the tensioning end anchorage device is prevented from being separated from the U-shaped plate during tensioning operation.
6. 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.
7. The correcting mechanism has the characteristics of simple operation, detachability, reusability and the like due to the adoption of the tensioning eccentric adjusting rod and the spiral pressure spring, the actual reinforcing cost and the construction difficulty can be greatly reduced, the stress condition of the tensioning reaction frame vertical plate is improved, and the stress of the tensioning guide rod in the tensioning process is more reasonable; 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 FIG. 1 with the deviation correcting mechanism removed and prior to anchoring;
FIG. 3 is a bottom view of FIG. 2;
FIG. 4 is an enlarged view of the U-shaped plate of FIG. 2;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a cross-sectional view B-B of FIG. 4;
FIG. 7 is an enlarged view of the connecting plate of the present invention;
FIG. 8 is a cross-sectional view taken along line C-C in FIG. 7
Fig. 9 is an enlarged view of a fixing plate and a bearing plate in the present invention;
FIG. 10 is a cross-sectional view taken along line D-D of FIG. 9;
fig. 11 is a schematic horizontal cross-sectional view of the upper and lower anchor plates of the present invention.
Detailed Description
As shown in fig. 1-11, the combined assembly deviation rectifying type prestressed fiber sheet tensioning device of the present invention comprises a tensioning end anchorage, a tensioning reaction frame, a tensioning guide rod 7, a tensioning baffle 12 and a jack 11;
the right end of the prestressed fiber sheet 1 is clamped in a tensioning end anchorage device, two tensioning guide rods 7 are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device, a tensioning reaction frame and a tensioning baffle plate 12 are sequentially sleeved on 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, 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 and the left surface of the tensioning baffle 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 anchorage device at the tensioning end and the left side of the tensioning reaction frame;
the tensioning reaction frame comprises a connecting plate 21, a fixing plate 17 and a bearing plate 18, wherein the front part and the rear part of the connecting plate 21 are respectively provided with a right guide hole 16 for penetrating a tensioning guide rod 7 along the left-right horizontal direction, the connecting plate 21 is fixedly connected to the lower surface of a civil engineering structure beam 30 through a second high-strength bolt 10, the right end edge of the fixing plate 17 is fixedly connected with the upper end edge of the bearing plate 18 to form an L-shaped plate-shaped structure, the fixing plate 17 is fixedly arranged on the lower surface of the connecting plate 21 through a third high-strength bolt 22, and the right side surface of the bearing plate 18 is in top pressing 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.
The tensioning end anchorage comprises a U-shaped plate 19, an upper anchoring plate 14 and a lower anchoring plate 15, the right end of a prestressed fiber sheet 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, the open end of the U-shaped plate 19 is horizontally arranged rightwards, the front part and the rear part of the U-shaped plate 19 are respectively provided with a left guide hole 3 used for penetrating a tensioning guide rod 7 along the left-right horizontal direction, the upper anchoring plate 14 and the lower anchoring plate 15 are positioned in the U-shaped plate 19, the U-shaped inner wall of the U-shaped plate 19 is provided with a U-shaped positioning groove 23, the left side edge, the front side edge and the rear side edge of the upper anchoring plate 14 and the lower anchoring plate 15 are respectively positioned in the U-shaped positioning groove 23, the upper side surface of the middle part of the U-shaped plate 19 is provided with a groove 20 used for penetrating the prestressed fiber sheet 1, and the lower surface of the upper anchoring plate 14 and the lower anchoring plate 15 are uniformly provided with a plurality of anti-skid tooth grains, the length direction of each anti-skid insection is perpendicular to the length direction of the prestressed fiber sheet 1, the depth of each anti-skid insection is 0.5mm, and the distance between every two adjacent anti-skid 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 plate 14 and anchor plate 15's left side border down and align, the length of going up anchor plate 14 is less than anchor plate 15's length down, a set of waist type hole 6 is from preceding then set up the right side portion at anchor plate 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 connecting plate 21 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 fibrous sheetsModulus of elasticity, cross-sectional area and length of the material.
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 combined assembly deviation-rectifying type prestressed fiber sheet tensioning device comprises the following steps:
1) cutting the prestressed fiber sheet 1: cutting a prestressed fiber sheet 1 with a proper length according to the length of the civil engineering structure beam 30, wherein the dimensions of the prestressed fiber sheet 1 are as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing a U-shaped plate 19, an upper anchoring plate 14 and a lower anchoring plate 15 of the anchorage device 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 connecting plate 21, a fixing plate 17 and a bearing plate 18 of the tension reaction frame, and integrally bending an L-shaped plate-shaped structure formed by the fixing plate 17 and the bearing plate 18 of the tension reaction frame;
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 sheet 1 to the lower surface of the left side of the civil engineering structure beam 30 by using a fixing anchorage 31; placing the left end of a prestressed fiber sheet 1 between an upper anchoring plate 14 and a lower anchoring plate 15 of a tensioning-end anchorage device, enhancing the fastening friction force between the anti-skid insections on the surfaces of the upper anchoring plate 14 and the lower anchoring plate 15 and the prestressed fiber sheet 1, screwing a first high-strength bolt 5 to enable the upper anchoring plate 14 and the lower anchoring plate 15 to clamp the prestressed fiber sheet 1, pushing the upper anchoring plate 14 and the lower anchoring plate 15 into a U-shaped positioning groove 23 from an opening at the right end of a U-shaped plate 19 leftwards, and enabling the prestressed fiber sheet 1 to pass through a groove 20 on the upper side of the middle part of the prestressed fiber sheet 1;
then installing a tension reaction frame: for the determination of the position of the tension reaction frame, the prestressed fiber sheet is setThe value of the applied prestress of 1 is 30 percent of the ultimate strength, the elongation of the prestressed fiber sheet 1 is 1.7 percent, and the actual elongation of the prestressed fiber sheet 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 close to the jack 11, wherein the position is an installation position of a tensioning reaction frame, fixedly connecting a connecting plate 21 to the lower surface of a civil engineering structure beam 30 by using a second high-strength bolt 10, and then fixedly arranging a fixing plate 17 on the lower surface of the connecting plate 21 by using a third high-strength bolt 22;
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 a bearing plate 18 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 sheet 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 U-shaped plate 19 of the tensioning end anchorage device to move rightwards through the tensioning guide rod 7, the upper anchoring plate 14 and the lower anchoring plate 15 synchronously move rightwards along with the U-shaped plate 19 under the limit of the U-shaped positioning groove 23 of the U-shaped plate 19, under the jacking action of two ends of a 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 parallel to the tensioning guide rod 7, the influence of bending deformation generated by eccentric stress of the tensioning guide rod 7 on the prestress value applied to the fiber sheet is avoided in the tensioning process, the tensioning of the prestress fiber sheet 1 is realized, when a group of kidney-shaped holes 6 on the lower anchoring plate 15 of the tensioning end anchorage device is found to cover a group of round holes 8 on a fixing plate 17 of a tensioning reaction frame 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 sheet 1 after the correction is correct;
7) and fixing the tension end anchorage device: 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 and the round hole 8 on the connecting plate 21, connecting the fourth high-strength bolt with the round hole 8, screwing the fourth high-strength bolt, 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, and then unloading and dismantling the jack 11, the U-shaped plate 19, the tensioning guide rod 7, the deviation correcting mechanism 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 combined assembly deviation-rectifying type prestressed fiber sheet tensioning device is characterized in that: comprises a tensioning end anchorage device, a tensioning reaction frame, a tensioning guide rod (7), a tensioning baffle (12) and a jack (11);
the right end of a prestressed fiber sheet (1) is clamped in a tensioning end anchorage device, two tensioning guide rods (7) are arranged in parallel along the left-right horizontal direction, the tensioning end anchorage device, a tensioning reaction frame and a tensioning baffle (12) sequentially penetrate and sleeve the two tensioning guide rods (7) from left to right, two ends of the tensioning guide rods (7) are respectively in threaded connection with a left locking nut (2) and a right locking nut (13), the right end of the left locking nut (2) is in contact with the left end face of the tensioning end anchorage device, and the left end of the 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 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 anchorage device at the tensioning end and the left side of the tensioning reaction frame;
the tensioning reaction frame comprises a connecting plate (21), a fixing plate (17) and a bearing plate (18), wherein the front part and the rear part of the connecting plate (21) are respectively provided with a right guide hole (16) used for penetrating a tensioning guide rod (7) in the left-right horizontal direction, the connecting plate (21) is fixedly connected to the lower surface of the civil engineering structure beam through a second high-strength bolt (10), the right end edge of the fixing plate (17) is fixedly connected with the upper end edge of the bearing plate (18) to form an L-shaped plate-shaped structure, the fixing plate (17) is fixedly arranged on the lower surface of the connecting plate (21) through a third high-strength bolt (22), and the right side surface of the bearing plate (18) is in abutting fit with the end part of a piston rod of the 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 comprises a U-shaped plate (19), an upper anchoring plate (14) and a lower anchoring plate (15), the right end of a prestressed fiber sheet (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, the open end of the U-shaped plate (19) is horizontally arranged rightwards, the front part and the rear part of the U-shaped plate (19) are respectively provided with a left guide hole (3) used for penetrating a tensioning guide rod (7) in the left-right horizontal direction, the upper anchoring plate (14) and the lower anchoring plate (15) are positioned in the U-shaped plate (19), the U-shaped positioning groove (23) is formed in the U-shaped inner wall of the U-shaped plate (19), the left side edges, the front side edges and the rear side edges of the upper anchoring plate (14) and the lower anchoring plate (15) are respectively positioned in the U-shaped positioning groove (23), the middle upper side face of the U-shaped plate (19) is provided with a groove (20) used for penetrating the prestressed fiber sheet (1), 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 fiber sheet (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 combination fitting deskewing prestressed fiber sheet tension device of 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 connecting plate (21) left part from preceding then, every waist type hole (6) all control with a round hole (8) and correspond the setting.
3. The combination assembly deviation rectifying type prestressed fiber sheet tensioning device according to claim 2, characterized in that: 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 the elastic modulus of the fiber sheet,Cross-sectional area and length.
4. The combination fitting deskewing prestressed fiber sheet tension device of 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 a tension device according to claim 4, characterized in that: the method comprises the following steps:
1) and cutting the prestressed fiber sheet (1): cutting a prestressed fiber sheet (1) with a proper length according to the length of the civil engineering structure beam, wherein the dimensions of the prestressed fiber sheet (1) are as follows: the width is 50mm, and the thickness is 1.4 mm;
2) processing and manufacturing a U-shaped plate (19), an upper anchoring plate (14) and a lower anchoring plate (15) of the anchorage device 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 connecting plate (21), a fixing plate (17) and a bearing plate (18) of the tensioning reaction frame, and integrally bending an L-shaped plate-shaped structure formed by the fixing plate (17) and the bearing plate (18) of the tensioning reaction frame;
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 sheet (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 a prestressed fiber sheet (1) between an upper anchoring plate (14) and a lower anchoring plate (15) of an anchorage device at a tensioning end, enhancing the fastening friction force between the upper anchoring plate (14) and the lower anchoring plate (15) and the prestressed fiber sheet (1) by using anti-skidding insections on the surfaces of the upper anchoring plate (14) and the lower anchoring plate (15), screwing a first high-strength bolt (5) to enable the upper anchoring plate (14) and the lower anchoring plate (15) to clamp the prestressed fiber sheet (1), pushing the upper anchoring plate (14) and the lower anchoring plate (15) into a U-shaped positioning groove (23) from an opening at the right end of a U-shaped plate (19) leftwards, and enabling the prestressed fiber sheet (1) to penetrate through a groove (20) on the upper side of the middle part of the prestressed fiber sheet (1);
then installing a tension reaction frame: for the determination of the position of the tension reaction frame, the prestress value applied to the prestressed fiber sheet (1) is set to be 30 percent of the ultimate strength, the elongation of the prestressed fiber sheet (1) is set to be 1.7 percent, and the actual elongation of the prestressed fiber sheet (1) is calculated to be
Measuring 5.1cm along a right tensioning direction from an initial position of one end of a tensioning end anchorage close to a jack (11), wherein the position is an installation position of a tensioning reaction frame, fixedly connecting a connecting plate (21) to the lower surface of the civil engineering structure beam by using a second high-strength bolt (10), and then fixedly arranging a fixing plate (17) on the lower surface of the connecting plate (21) by using a third high-strength bolt (22);
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 plate (12) is penetrated to the right ends of the two tensioning guide rods (7), a jack (11) is placed between a pressure bearing plate (18) and the tensioning baffle plate (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 tensioned prestressed fiber sheet (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 U-shaped plate (19) of a tensioning end anchorage device to move rightwards through a tensioning guide rod (7), an upper anchoring plate (14) and a lower anchoring plate (15) move rightwards synchronously along with the U-shaped plate (19) under the limit of a U-shaped positioning groove (23) of the U-shaped plate (19), 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 kept parallel to the tensioning guide rod (7), the influence of bending deformation caused by eccentric stress of the guide rod (7) in the tensioning process on the application of a prestress value to a fiber sheet is avoided, so that the prestress fiber sheet (1) is realized, and a group of waist-shaped holes (6) on the lower anchoring plate (15) of the tensioning end anchorage device in the tensioning end anchorage device is covered on a tensioning reverse tensioning reaction in the tensioning process When a group of round holes (8) are formed in a fixing plate (17) of the force frame, reading of a hydraulic pressure meter on a hydraulic station is checked, a jack (11) is synchronously pressurized or unloaded to finely adjust a tension value, and prestress application to the prestressed fiber sheet (1) is completed after correction is correct;
7) fixing the tension end anchorage device: keeping a jack (11) in a load-holding state, aligning a waist-shaped hole (6) reserved on the tensioning end anchorage device with a position where a round hole (8) on a connecting plate (21) is overlapped, connecting a fourth high-strength bolt with the round hole (8), after the fourth high-strength bolt is screwed down, filling redundant parts in the waist-shaped hole (6) with U-shaped keys to finish fixing the tensioning end anchorage device, and then unloading and dismantling the jack (11), a U-shaped plate (19), a tensioning guide rod (7), a deviation correcting mechanism and a tensioning baffle plate (12).
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| CN107859348B (en) * | 2017-10-20 | 2020-05-05 | 长安大学 | Active force application system for fiber fabric |
| CN109403655B (en) * | 2018-12-11 | 2021-03-05 | 淮海工学院 | Method for reinforcing concrete beam span |
| CN113202323B (en) * | 2021-03-31 | 2022-05-24 | 河海大学 | Single-wedge-shaped-clamp-piece prestressed FRP plate tensioning and anchoring device and steel beam reinforcing method |
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