CN115961801A - Active reinforcing method for portal steel frame - Google Patents
Active reinforcing method for portal steel frame Download PDFInfo
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- CN115961801A CN115961801A CN202310135418.2A CN202310135418A CN115961801A CN 115961801 A CN115961801 A CN 115961801A CN 202310135418 A CN202310135418 A CN 202310135418A CN 115961801 A CN115961801 A CN 115961801A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002787 reinforcement Effects 0.000 claims abstract description 34
- 238000004873 anchoring Methods 0.000 claims description 84
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 29
- 239000004917 carbon fiber Substances 0.000 claims description 29
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 29
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The application relates to an active reinforcing method of a portal steel frame, relating to the field of building structure reinforcement and comprising the following steps of firstly, designing a mechanical model; calculating stress data, determining a tension point on the side wall of the steel frame beam, selecting a pre-tightening rope, calculating pre-tightening force required to be generated by the pre-tightening rope, calculating deformation of the pre-tightening rope, determining a deformation fixing point of the pre-tightening rope, and calculating deformation tension for pulling the pre-tightening rope; step three, setting a connecting structure; step four, mounting a reinforcing structure, mounting a pre-tightening rope and performing pre-tensioning; and fifthly, formally stretching and reinforcing. This application has portal steel frame and consolidates convenience, the efficiency of construction is high, consolidate effectual effect, and can simulate atress data and actual atress data to the arm in the work progress, inspects portal steel frame construction, guarantee security.
Description
Technical Field
The application relates to the field of building structure reinforcement, in particular to an active reinforcement method for a portal steel frame.
Background
The portal steel frame light steel structure has the advantages of simple stress, clear force transmission path, standard components, factory production, convenient construction and the like, and is widely applied to industrial buildings and civil buildings.
In the correlation technique, because the change of design function, if utilize roofing construction photovoltaic power plant, the load of door formula steelframe can increase, just need consolidate door formula steelframe under this kind of condition. The reinforcing mode of the portal steel frame steel structure can be divided into passive reinforcement and active reinforcement according to the action principle. Passive reinforcement means directly adds corresponding reinforcement material in the weak region of steel member, and conventional reinforcement means is including modes such as increase roof truss roof beam cross-sectional dimension, increase roof truss roof beam quantity, and this type of reinforcement mode construction is complicated, the progress is slow and the cost is high, is difficult to satisfy the reinforcement demand. The active reinforcement means that prestress is pertinently applied to the member, the problem of stress hysteresis existing in passive reinforcement is solved, the performance of the material is fully exerted, and the performance of the material is utilized to the maximum.
A common active reinforcement method is to install a pre-tightening rope on the steel frame structure, and apply a pulling force between two fixing points on the steel frame structure, so as to generate a pre-stress in the steel frame structure. When the pre-tightening rope is installed, one end of the pre-tightening rope is fixed on a fixed point, then pulling force is applied to the pre-tightening rope by using the traction equipment, and then the other end of the pre-tightening rope is fixed, so that pre-stress is generated in the steel frame structure.
In order to solve the problems of the related art, the pretightening rope needs to be tensioned and then installed, and the installation is difficult, the inventor designs an active reinforcing method for the door type steel frame.
Disclosure of Invention
In order to reinforce the portal steel frame, the application provides an active reinforcing method for the portal steel frame, which has the effects of simple reinforcing structure, reliable enhancement of the strength of the portal steel frame, simple reinforcing method and convenience in implementation.
The application provides an active reinforcement method of a portal steel frame, which adopts the following technical scheme:
an active reinforcement method for a portal steel frame, comprising the following steps:
step one, designing a mechanical model, calculating the stress of a steel frame beam according to the load condition of a portal steel frame, and calculating the prestress to be applied to the steel frame beam;
calculating stress data, determining tension points on the side wall of the steel frame beam, selecting pre-tightening ropes with corresponding lengths according to the distances between the tension points, calculating pre-tightening force required to be generated by the pre-tightening ropes according to the required pre-tightening force, calculating deformation required by the pre-tightening ropes to reach the pre-tightening force, determining a deformation fixing point of the pre-tightening ropes, and calculating deformation tension required by pulling the pre-tightening ropes to the deformation fixing point;
step three, arranging a connecting structure, namely arranging a rope fixing piece for connecting a pre-tightening rope at a position on the steel frame beam corresponding to the tension point, and arranging a deformation fixing component for fixing the pre-tightening rope to keep the pre-tightening rope deformed at a position on the steel frame beam corresponding to the deformation fixing point;
step four, mounting a reinforcing structure, fixing a pre-tightening rope on the steel frame beam, pre-tensioning the pre-tightening rope, wherein the pre-tensioning tension is smaller than the deformation tension in the step two, so as to eliminate potential safety hazards;
and fifthly, formally stretching and reinforcing, pulling the pre-tightening rope to the position of the deformation fixing point after pre-stretching, comparing the actual tension for pulling the pre-tightening rope at the moment with the deformation tension calculated in the step two, and fixing the position of the pre-tightening rope by using the deformation fixing component after the comparison that the actual tension meets the requirement to finish reinforcing.
By adopting the technical scheme, the mechanical model is utilized to analyze the stress of the steel frame beam of the portal steel frame in advance, and the prestress required to be added by the steel frame beam is calculated; the installation of the pre-tightening rope provides tension for the steel frame beam to generate prestress in the steel frame beam, so that load is offset, positive and negative bending moments of an original structure can be reduced simultaneously, the bearing capacity of the steel frame beam is enhanced, and the problem of strain lag in passive reinforcement is avoided. The pre-tightening rope is pulled to deform to apply tension for reinforcement, so that the number of reinforcement components is small, the size of the components is small, the installation of the reinforcement components is convenient, and the reinforcement effect is attractive; the pretightening force of the pretightening rope is maintained by fixing the pretightening rope through the deformation fixing component, and the deformation of the pretightening rope and the position of the deformation fixing component are set in advance, so that the construction is convenient; because the pre-tightening rope stretching amount and the pre-tightening rope stretching force are pre-calculated, the pre-calculated pre-tightening rope deformation pulling force is compared with the actual pulling force of the pre-tightening rope during actual construction, whether the stress is abnormal or not can be conveniently judged, and then whether the stress is abnormal or not is judged on the reinforced structure of the steel frame girder, so that the abnormal structure can be efficiently checked, and the strength of the portal steel frame structure can be better guaranteed.
Optionally, the rope fixing piece is a cylindrical pin shaft; the end part of the pre-tightening rope is provided with a ring sleeve sleeved on the pin shaft; the deformation fixing assembly comprises an anchoring piece fixed on the pre-tightening rope, an anchoring hole formed in the steel frame beam and a lock pin, the size of the lock pin is matched with that of the anchoring hole, and a locking hole penetrating through the lock pin is formed in the anchoring piece;
the third step comprises: s31, polishing and grinding the positions, corresponding to the tension point and the deformation fixing point, on the steel frame beam, and removing the surface coating; s32, respectively fixing a reinforcing plate and an anchoring plate at positions on the steel frame beam corresponding to the tension point and the deformation fixing point; s33, respectively forming a pin shaft hole and an anchoring hole in positions, corresponding to the tension point and the deformation fixing point, on the steel frame beam in a penetrating manner, and synchronously processing corresponding through holes on the reinforcing plate and the anchoring plate; and S34, inserting a pin shaft into the pin shaft hole.
By adopting the technical scheme, the pin shaft is used as a tension point on the steel frame beam, the pin shaft is directly inserted into the pin shaft hole for fixing, the rope fixing part is convenient to install, the end part of the carbon fiber rope is directly sleeved on the pin shaft in a sleeved mode to complete fixing, the carbon fiber rope is simple and convenient to fix, and the construction efficiency of the whole portal steel frame structure is improved. The reinforcing plate and the anchoring plate can enhance the hole strength of the pin shaft hole and the anchoring hole, and the stability and reliability of the reinforcing structure are guaranteed.
Optionally, in the fourth step and the fifth step, the pre-tightening rope is stretched and pre-tightened through a detachable tightening assembly, the tightening assembly comprises a pull rod, a bearing plate and a drawing part, the pull rod is detachably fixed to the lower side of the anchoring part, the bearing plate is installed at the lower end of the pull rod, and the drawing part is arranged between the steel frame beam and the bearing plate;
step four, S41, sleeving the ring sleeves at the two ends of the pre-tightening rope on the pin shaft; s42, mounting the bearing plate at the lower end of the pull rod, and mounting the drawing piece between the bearing plate and the steel frame beam to provide drawing force for separating the bearing plate and the steel frame beam; s43, applying a drawing force to the bearing plate by using the drawing piece, and drawing the anchoring piece downwards without drawing the anchoring piece to the anchoring hole; and S44, keeping the force application of the drawing piece, and checking whether the door type steel structure is abnormal or not.
Through adopting above-mentioned technical scheme, pull rod, loading board and drawing piece, the convenient pulls away the anchor assembly initial position, and then tensile carbon fiber cable realizes the pretension. Simple structure, convenient to use, easy dismounting helps promoting the efficiency of construction. After all the structures are installed for the first time, stretching and pre-tightening are not performed in place immediately, but a small distance is pulled for pre-tensioning, so that the situations that the structure problem exists, a rope and a pin shaft are broken and the like are prevented, potential safety hazards are prevented, and construction and installation are guaranteed.
Optionally, the pre-tightening rope comprises two carbon fiber cables, the two carbon fiber cables are respectively fixed on two sides of the anchoring part, and the two ends of the carbon fiber cables are both provided with the loop; the carbon fiber cable anchoring device is characterized in that slots for inserting ring sleeves on the carbon fiber cables are formed in two sides of the anchoring part, hinge holes are formed in the anchoring part in a penetrating mode corresponding to through holes in the ring sleeves, the hinge holes penetrate through the slots, hinge pins are arranged in the hinge holes, and the hinge pins penetrate through the hinge holes and the through holes in the ring sleeves to connect the carbon fiber cables and the anchoring part.
By adopting the technical scheme, the anchoring piece and the carbon fiber cable are connected through the hinge pin, the carbon fiber cable and the anchoring piece can rotate relative to each other by taking the hinge pin as a shaft, when the carbon fiber cable is tensioned by applying pulling force to the anchoring piece, the carbon fiber cable rotates relative to the anchoring piece, and the pulling process is smoother; meanwhile, the carbon fiber cables and the anchoring piece rotate relatively, so that the carbon fiber cables on two sides of the anchoring piece keep a linear stretching state, the carbon fiber cables cannot be bent, and the structure is more stable.
Optionally, in S41, two groups of pre-tightening ropes and anchoring members are symmetrically installed on two sides of the steel frame beam; and S42, respectively installing pull rods on the lower sides of two symmetrical anchoring parts on two sides of the steel frame, and installing the bearing plate between the two pull rods.
By adopting the technical scheme, the carbon fiber cables are correspondingly arranged on the two sides of the steel frame beam respectively, the two groups of pre-tightening ropes act between the two tension points, the tension force required to be exerted by a single pre-tightening rope is reduced, the strength requirement of the pre-tightening ropes is reduced, and the reinforcement cost is reduced. And the stress on the two sides is balanced mutually, so that the stress is optimized.
Optionally, the drawing piece is a hydraulic jack with a pressure gauge;
step five includes S51, driving the drawing piece to draw the locking hole of the anchoring piece to the position of the anchoring hole; s52, reading the pressure on the pressure gauge, and comparing the pressure of the pressure gauge with the sum of the two pre-tightening rope budget tensions; s53, fixing an anchoring piece, wherein the lock pin penetrates through the anchoring hole and the two locking holes to fix the anchoring piece; and S54, after the tension is calibrated to be correct, disassembling the tensioning assembly, disassembling the drawing piece, and then disassembling the pull rod from the anchoring piece.
Through adopting above-mentioned technical scheme, select for use the hydraulic jack who takes the manometer as drawing the piece, the workman of being convenient for reachs the pressure of jack fast to compare the pulling force, check up whether there is the problem in the structure atress.
Optionally, the steel frame beam is a pointed top beam with a triangular outline, the steel frame beam is divided into a left beam body and a right beam body by taking a pointed top position as a boundary, two ends of the left beam body and the right beam body are respectively provided with a rope fixing piece for fixing a pre-tightening rope, and the pre-tightening rope and the anchoring piece are respectively provided with two groups corresponding to the left beam body and the right beam body; the end parts of the pre-tightening ropes corresponding to the beam bodies are fixed on the rope fixing part at the end part of the other beam body in a crossed manner at one end where the left beam body and the right beam body are connected.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the invention, an active reinforcement means is adopted, so that the positive and negative bending moments of the original structure can be reduced at the same time, the problem of strain lag of passive reinforcement is solved, whether the structural strength of the door type steel frame structure is normal or not can be visually detected by comparing pre-calculated stress data with actual stress data, and the potential safety hazard can be timely checked;
2. the invention has few reinforcing components, small size of the components and beautiful reinforcing effect;
3. the reinforcing members are positioned on two sides of the original structural beam, so that the using function is not influenced;
4. the invention can change the position of the reserved hole according to the magnitude of the prestress required to be applied, and even can place a large pin shaft used for anchoring below the steel beam.
Drawings
FIG. 1 is a schematic overall structural view of an actively reinforced portal steel frame structure to which the present application relates;
FIG. 2 is a schematic structural diagram of the region A in FIG. 1;
FIG. 3 is an exploded view of the structure of FIG. 2;
FIG. 4 is a schematic structural diagram of the region C in FIG. 1;
FIG. 5 is a schematic structural view of a deformation securing assembly and a tensioning assembly in an embodiment of the present application;
fig. 6 is a schematic structural view of a region B in fig. 1.
Reference numerals are as follows: 1. a steel frame beam; 11. a pin shaft hole; 12. an anchoring hole; 13. a left beam body; 14. a right beam body; 2. pre-tightening the rope; 21. a carbon fiber cord; 22. sleeving a ring; 3. a pin shaft; 5. a reinforcing plate; 6. an anchoring plate; 7. an anchoring member; 71. a slot; 72. a locking hole; 75. a hinge pin; 8. a lock pin; 9. a tension assembly; 91. a pull rod; 92. a carrier plate; 93. drawing the piece; 10. a steel frame column.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses an active reinforcing method for a portal steel frame.
Referring to fig. 1, the portal steel frame comprises steel frame columns 10 and steel frame beams 1, the steel frame columns 10 and the steel frame beams 1 are made of i-shaped steel sections, the steel frame beams 1 are erected between the two steel frame columns 10, and the steel frame columns 10 and the steel frame beams 1 are fixedly connected through high-strength bolts. The steel frame beam is of a triangular pointed top beam structure and is divided into a left beam body and a right beam body by taking a pointed top connecting part as a boundary; the steel frame beam is formed by splicing a plurality of sections of I-shaped steel profiles, and the I-shaped steel profiles are connected and fixed through high-strength bolts.
An active reinforcement method for a portal steel frame, comprising the following steps:
step one, designing a mechanical model. The load bearing condition of the portal steel frame is calculated in advance through simulation according to the construction information, the stress of the steel frame beam 1 is calculated according to the load bearing condition of the portal steel frame, and the prestress to be applied to the steel frame beam 1 is calculated.
And step two, calculating stress data. And (3) determining the position of a tension point on the side wall of the steel frame beam 1, and arranging one tension point at each of two ends of the left beam body 13 and the right beam body 14. And selecting the pre-tightening ropes 2 with corresponding lengths according to the distance between the tension points, calculating the pre-tightening force required to be generated by the pre-tightening ropes 2 according to the pre-tightening force calculated in the step one, and calculating the deformation required by the pre-tightening ropes 2 to reach the pre-tightening force. Determining a deformation fixing point of the pre-tightening rope 2 by taking the two tension points as hinge points and combining the calculated deformation of the pre-tightening rope 2; the deformation tension required to pull the pre-tensioned cable 2 to the deformation fixing point position is calculated.
And step three, setting a connecting structure. And a rope fixing piece connected with the pre-tightening rope 2 is arranged at a position on the steel frame beam 1 corresponding to the tension point, and a deformation fixing component is arranged according to the position of the deformation fixing point.
Referring to fig. 2 and 3, the rope fixing member is a cylindrical pin shaft 3; referring to fig. 4 and 5, the deformation fixing assembly includes an anchor member 7 fixed on the pre-tightening rope 2, an anchoring hole 12 formed in the steel frame beam 1, and a locking pin 8, the locking pin 8 is adapted to the anchoring hole 12 in size, and a locking hole 72 penetrating through the locking pin 8 is formed in the anchor member 7. The two sides of the anchoring member 7 are provided with slots 71 for inserting the loop 22 on the carbon fiber cable 21, the anchoring member 7 is provided with hinge holes 74 corresponding to the through holes on the loop 22, the hinge holes 74 penetrate the slots 71, hinge pins 75 are arranged in the hinge holes 74, and the hinge pins 75 penetrate the hinge holes 74 and the through holes on the loop 22 to connect the carbon fiber cable 21 and the anchoring member 7.
The third step specifically comprises: s31, polishing and grinding the positions, corresponding to the tension point and the deformation fixing point, on the web plate of the steel frame beam 1, and removing the surface coating; s32, respectively welding and fixing the reinforcing plate 5 and the anchoring plate 6 at the positions, corresponding to the tension point and the deformation fixing point, on the steel frame beam 1 so as to strengthen the beam web strength at the corresponding positions; s33, respectively penetrating and arranging a pin shaft hole 11 and an anchoring hole 12 at positions corresponding to the tension point and the deformation fixing point on the steel frame beam 1, and synchronously processing corresponding through holes on the reinforcing plate 5 and the anchoring plate 6; and S34, inserting the pin shaft 3 into the pin shaft hole 11.
And step four, mounting a reinforcing structure. And (3) fixing a pre-tightening rope 2 on the steel frame beam 1, and pre-tensioning the pre-tightening rope 2 to eliminate potential safety hazards. Referring to fig. 4 and 5, the pre-tightening rope 2 includes two carbon fiber cables 21, the two carbon fiber cables 21 are respectively fixed on both sides of the anchoring member 7, and both ends of the carbon fiber cables 21 are integrally provided with annular collars 22 for connection.
Referring to fig. 6, the tensile pretensioning of the pretensioning cable 2 is performed by means of a detachable tensioning assembly 9, which tensioning assembly 9 comprises a pull rod 91, a carrier plate 92 and a pull member 93. The pull rod 91 is a whole screw rod, the lower end of the anchoring part 7 is provided with a threaded hole in threaded fit with the pull rod 91, one end of the pull rod 91 is screwed on the lower side of the anchoring part 7, and the other end of the pull rod 91 is screwed with a bearing nut; the through hole is opened on the bearing plate 92 corresponding to the pull rod 91, the bearing plate 92 is sleeved on the pull rod 91, the bearing nut is located on the lower side of the bearing plate 92 for supporting, and the drawing part 93 is arranged between the steel frame beam 1 and the bearing plate 92. The pull-off member 93 is a jack with a pressure gauge.
The fourth step specifically comprises S41, wherein each group of beam bodies of the left beam body 13 and the right beam body 14 is correspondingly provided with two groups of pre-tightening ropes 2 and anchoring parts 7, and the two groups of pre-tightening ropes 2 are respectively arranged on two sides of the corresponding beam bodies; the ring sleeves 22 at two ends of the pre-tightening rope 2 are sleeved on the pin shaft 3, the end part of the left beam body 13 connected with the right beam body 14 is sleeved with the ring sleeve 22 at the end part of the pre-tightening rope 2 corresponding to each beam body in a crossed manner on the pin shaft 3 at the end part of the other beam body. S42, connecting the pull rod 91 to the lower end of the anchoring part 7 in a screwing manner, installing the bearing plate 92 at the lower end of the pull rod 91, respectively sleeving the two ends of the bearing plate 92 on the pull rods 91 at the two sides of the beam body, connecting a bearing nut on the pull rod 91 in a screwing manner to support the bearing plate 92, installing the jack between the bearing plate 92 and the steel frame beam 1, adjusting the positions of the bearing plate 92 and the bearing nut, and respectively enabling the two ends of the jack to be tightly abutted against the beam body and the bearing plate; s43, applying a drawing force to the bearing plate 92 by using a jack, drawing the anchoring piece 7 downwards, but not drawing the anchoring piece 7 to the anchoring hole 12 for pre-stretching; and S44, the pulling piece 93 keeps applying force, whether the door type steel frame structure is abnormal or not is checked, and risks are checked.
And fifthly, formally stretching and reinforcing. After hidden danger is eliminated through prestretching, the pre-tightening rope 2 is pulled to the position of the deformation fixing point, the actual tension for pulling the pre-tightening rope 2 at the moment is compared with the deformation tension calculated in the second step, and after the actual tension meets the requirement, the position of the pre-tightening rope 2 is fixed through the deformation fixing component, and reinforcement is completed.
Step five specifically comprises S51, driving a jack, and pulling the locking hole 72 of the anchoring part 7 to the position of the anchoring hole 12 on the beam body; s52, reading the pressure on a jack pressure gauge, and comparing the pressure of the pressure gauge with the sum of the deformation tension of the two pre-tightening ropes 2; s53, fixing the anchoring piece 7, and after the tension is checked to be not beyond the error allowable range, fixing the anchoring piece 7 by the locking pin 8 penetrating through the anchoring hole 12 and the two locking holes 72; s54, the tensioning assembly 9 is disassembled, the jack is loosened, the pulling piece 93 is disassembled, and then the pull rod 91 is disassembled from the anchoring piece 7.
And step six, performing fireproof and antirust treatment on the door type steel frame.
The implementation principle of the active reinforcing method for the portal steel frame disclosed by the embodiment of the application is as follows: through installation pretension rope 2, for left roof beam body 13 and right roof beam body 14 provide both ends to the drawing power in the middle of, and then produce prestressing force in the roof beam body, this positive and negative moment of flexure that can reduce the primary structure simultaneously, solved passive reinforcement strain lag's problem. The pulling force that pretension rope 2 was applyed takes place deformation and is produced through self, through the required prestressing force of precomputation left beam body 13 and right beam body 14, and then calculate required drawing force, combine pretension rope 2 material to calculate the required deformation of this drawing force again, and then predesign calculates pretension rope 2's deformation fixed point and accomplishes the required deformation pulling force of deformation, accomplish initiative reinforcement back, compare actual pulling force and the deformation pulling force of calculation, can audio-visually detect initiative reinforced portal frame, when data error is great, show that portal frame structure has the problem, in time need carry out troubleshooting or be under construction again. When the door type steel frame is actively reinforced, the structure of the door type steel frame can be verified, the construction efficiency is improved, and the potential safety hazard is reduced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. An active reinforcement method for a portal steel frame, comprising:
step one, designing a mechanical model, calculating the stress of a steel frame beam (1) according to the load condition of a portal steel frame, and calculating the prestress to be applied to the steel frame beam (1);
secondly, stress data are calculated, tension points on the side wall of the steel frame beam (1) are determined, pre-tightening ropes (2) with corresponding lengths are selected according to the distance between the tension points, pre-tightening force required to be generated by the pre-tightening ropes (2) is calculated according to required pre-tightening force, deformation required for the pre-tightening ropes (2) to reach the pre-tightening force is calculated, a deformation fixing point of the pre-tightening ropes (2) is determined, and deformation tension required for pulling the pre-tightening ropes (2) to the deformation fixing point is calculated;
thirdly, arranging a connecting structure, namely arranging a rope fixing piece connected with a pre-tightening rope (2) at a position corresponding to the tension point on the steel frame beam (1), and arranging a deformation fixing component for fixing the pre-tightening rope (2) to keep the pre-tightening rope (2) deformed at a position corresponding to the deformation fixing point on the steel frame beam (1);
step four, mounting a reinforcing structure, fixing a pre-tightening rope (2) on the steel frame beam (1), and pre-tensioning the pre-tightening rope (2), wherein the pre-tensioning tension is smaller than the deformation tension in the step two so as to investigate potential safety hazards;
and fifthly, formally stretching and reinforcing, pulling the pre-tightening rope (2) to the position of the deformation fixing point after pre-stretching, comparing the actual pulling force of pulling the pre-tightening rope (2) with the deformation pulling force calculated in the second step, and fixing the position of the pre-tightening rope (2) by using the deformation fixing component after the comparison that the actual pulling force meets the requirement to finish reinforcing.
2. The active reinforcement method of a portal steel frame according to claim 1, wherein: the rope fixing piece is a cylindrical pin shaft (3); a ring sleeve (22) sleeved on the pin shaft (3) is arranged at the end part of the pre-tightening rope (2); the deformation fixing assembly comprises an anchoring piece (7) fixed on the pre-tightening rope (2), an anchoring hole (12) formed in the steel frame beam (1) and a lock pin (8), the lock pin (8) is matched with the anchoring hole (12) in size, and a locking hole (72) penetrating through the lock pin (8) is formed in the anchoring piece (7) in a penetrating mode;
the third step comprises: s31, polishing and grinding the positions, corresponding to the tension point and the deformation fixing point, on the steel frame beam (1) to remove the surface coating; s32, respectively fixing a reinforcing plate (5) and an anchoring plate (6) at positions corresponding to the tension point and the deformation fixing point on the steel frame beam (1); s33, respectively penetrating and arranging a pin shaft hole (11) and an anchoring hole (12) at positions corresponding to the tension point and the deformation fixing point on the steel frame beam (1), and synchronously processing corresponding through holes on the reinforcing plate (5) and the anchoring plate (6); s34, inserting the pin shaft (3) into the pin shaft hole (11).
3. The active reinforcement method of a portal steel frame according to claim 2, wherein: in the fourth step and the fifth step, the pre-tightening rope (2) is stretched and pre-tightened through a detachable tightening assembly (9), the tightening assembly (9) comprises a pull rod (91), a bearing plate (92) and a drawing piece (93), the pull rod (91) is detachably fixed to the lower side of the anchoring piece (7), the bearing plate (92) is installed at the lower end of the pull rod (91), and the drawing piece (93) is arranged between the steel frame beam (1) and the bearing plate (92);
step four includes S41, sleeving the ring sleeves (22) at the two ends of the pre-tightening rope (2) on the pin shaft (3); s42, mounting the bearing plate (92) at the lower end of the pull rod (91), and mounting the drawing piece (93) between the bearing plate (92) and the steel frame beam (1) to provide drawing force for separating the bearing plate and the steel frame beam; s43, applying a drawing force to the bearing plate (92) by using a drawing piece (93), and drawing the anchoring piece (7) downwards without drawing the anchoring piece (7) to the anchoring hole (12); s44, the drawing piece (93) keeps applying force, and whether the door type steel structure is abnormal or not is checked.
4. The active reinforcement method of a portal steel frame according to claim 3, wherein: the pre-tightening rope (2) comprises two carbon fiber cables (21), the two carbon fiber cables (21) are respectively fixed on two sides of the anchoring piece (7), and the two ends of each carbon fiber cable (21) are respectively provided with the ring sleeves (22); the carbon fiber cable anchoring device is characterized in that two sides of the anchoring piece (7) are provided with inserting grooves (71) inserted in the ring sleeves (22) on the carbon fiber cables (21), hinge holes (74) penetrate through holes in the corresponding ring sleeves (22) on the anchoring piece (7), the hinge holes (74) penetrate through the inserting grooves (71), hinge pins (75) are arranged in the hinge holes (74), and the hinge pins (75) penetrate through the hinge holes (74) and the through holes in the ring sleeves (22) to connect the carbon fiber cables (21) and the anchoring piece (7).
5. The active reinforcement method for a portal steel frame as defined in claim 3, wherein: in S41, two groups of pre-tightening ropes (2) and anchoring pieces (7) are symmetrically arranged on two sides of a steel frame beam (1); in S42, pull rods (91) are respectively installed on the lower sides of two symmetrical anchoring pieces (7) on two sides of the steel frame, and a bearing plate (92) is installed between the two pull rods (91).
6. The active reinforcement method of a portal steel frame according to claim 5, wherein: the drawing piece (93) is a hydraulic jack with a pressure gauge;
step five includes S51, driving a pulling piece (93) to pull the locking hole (72) of the anchoring piece (7) to the position of the anchoring hole (12); s52, reading the pressure on the pressure gauge, and comparing the pressure of the pressure gauge with the sum of the budget tensions of the two pre-tightening ropes (2); s53, fixing an anchoring piece (7), wherein a lock pin (8) penetrates through an anchoring hole (12) and two locking holes (72) to fix the anchoring piece (7); s54, after the tension is calibrated to be correct, the tensioning assembly (9) is disassembled, the pulling piece (93) is disassembled, and then the pull rod (91) is disassembled from the anchoring piece (7).
7. The active reinforcement method of a portal steel frame according to claim 5, wherein: the steel frame beam (1) is a pointed top beam with a triangular outline, the steel frame beam (1) is divided into a left beam body (13) and a right beam body (14) by taking a pointed top position as a boundary, two ends of the left beam body (13) and the right beam body (14) are respectively provided with a rope fixing piece for fixing a pre-tightening rope (2), and the pre-tightening rope (2) and the anchoring piece (7) are respectively provided with two groups corresponding to the left beam body (13) and the right beam body (14); one end of the left beam body (13) connected with the right beam body (14) is crossed and fixed on the rope fixing piece at the end of the other beam body corresponding to the end part of the pre-tightening rope (2) of each beam body.
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| CN116927515A (en) * | 2023-09-14 | 2023-10-24 | 北京市建筑工程研究院有限责任公司 | Auxiliary device for resisting accumulated fatigue fracture of steel beam and use method |
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