CN114892994B - Dismounting device and method suitable for prestressed inhaul cable - Google Patents
Dismounting device and method suitable for prestressed inhaul cable Download PDFInfo
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- CN114892994B CN114892994B CN202210823030.7A CN202210823030A CN114892994B CN 114892994 B CN114892994 B CN 114892994B CN 202210823030 A CN202210823030 A CN 202210823030A CN 114892994 B CN114892994 B CN 114892994B
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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
- E04G21/121—Construction of stressing jacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a dismounting device and a method suitable for a prestressed inhaul cable, wherein the dismounting device comprises: the two tensioning ear plates are symmetrically arranged at the left side and the right side of the main ear plate of the inhaul cable; the two tensioning fork lugs are respectively connected with the tensioning lug plates through pin shafts; the middle part and two sides of the bearing frame are respectively provided with a first channel and a second channel, and the first channel is used for penetrating a stay cable body; the two retaining boxes are symmetrically fixed on two sides of the bottom of the bearing frame; the two sets of force transmission rod assemblies are arranged, and each set of force transmission rod assembly comprises a force transmission rod assembly and a nut assembly; two tensioning through hydraulic jacks are sleeved on the two force transmission rod pieces in parallel; one end of the force transmission rod piece is connected with the tensioning fork lug, and the other end of the force transmission rod piece penetrates through the second channel of the bearing frame, the backstop box and the tensioning penetrating hydraulic jack respectively. The invention solves the cable replacement problem of local damage of the stay cable wire caused by the incomplete protection of the finished product on the construction site.
Description
Technical Field
The invention relates to the field of prestressed cable construction, in particular to a device and a method suitable for disassembling a prestressed cable.
Background
In both prestressed steel structures and prestressed concrete structures, prestressed guy cable structures are used. However, in the prior art, the stay cable is not protected in place in the construction process, so that the stay cable is partially damaged, for example, in the welding or cutting process of an upper steel member, welding flux or molten steel falls onto a lower cable body, and partial cable wires of the cable body are fused. For example, in the welding process of the steel member, the cable body is conductive, local cable wires of the cable body can be broken by current, the safety of the whole structure can be influenced by the local broken wires of the cable body, and even great potential safety hazards can be caused to the whole structure.
Disclosure of Invention
The invention aims to provide a dismounting device and a dismounting method suitable for a prestressed inhaul cable, so as to solve the problems in the background technology.
In order to achieve the above object, the present invention provides a detaching device for a prestressed cable, comprising: the two tensioning ear plates are symmetrically arranged on the left side and the right side of the main ear plate of the stay cable and are fixedly connected with main body structures on the left side and the right side of the main ear plate of the stay cable; the two tensioning fork lugs are respectively connected with the tensioning lug plates through pin shafts; the middle part and two sides of the bearing frame are respectively provided with a first channel and a second channel, and the first channel is used for penetrating a stay cable body; the two retaining boxes are symmetrically arranged on two sides of the bottom of the bearing frame; the two sets of force transmission rod assemblies are arranged, and each set of force transmission rod assembly comprises a force transmission rod piece and a nut assembly; two tensioning penetrating hydraulic jacks are sleeved on the two force transmission rod pieces in parallel; one end of the force transmission rod piece is connected with the tensioning fork lug, and the other end of the force transmission rod piece penetrates through the second channel of the bearing frame, the backstop box and the tensioning penetrating hydraulic jack respectively.
In a preferred embodiment, the nut assembly comprises three sets, the first set of nut assembly is used for connecting the force transmission rod assembly and the tensioning fork lug, the second set of nut assembly is arranged in the retaining box, and the third set of nut assembly is arranged at the tail part of the tensioning penetrating hydraulic jack.
In a preferred embodiment, the stopping box is a hollow box body structure formed by welding a plurality of steel plates, through holes are correspondingly formed in the top and the bottom of the stopping box and used for penetrating the force transmission rod piece, and each stopping box and the bearing frame are clamped through the nut assembly.
In a preferred embodiment, the bearing frame is a two-piece structure, the two bearing frames clamp the stay cable body and are fixedly connected through a plurality of split bolts, the two bearing frames are formed by welding a plurality of steel plates, a plurality of bolt holes are correspondingly formed in the two bearing frames, and the bolt holes are formed in two sides of the first channel at intervals along multiple rows and multiple columns.
In a preferred embodiment, the tensioning fork lug is of a U-shaped structure, pin holes are symmetrically formed in two side plates of an opening end of the U-shaped structure and used for penetrating pin shafts, a through hole is formed in a bottom plate of the U-shaped structure and used for penetrating force transmission rod pieces, each force transmission rod piece is made of finish-rolled deformed steel bar or steel pull rod, the material of each force transmission rod piece is 40Cr, the force transmission rod piece is subjected to thermal refining, and the breaking force of each force transmission rod piece at least meets 1.5 times of the tensioning force of the inhaul cable.
In a preferred embodiment, the hydraulic tensioning system further comprises a feed-through pressure sensor, a tensioning oil pump and a matched oil pipe, wherein the feed-through pressure sensor is arranged between the retaining box and the tensioning feed-through hydraulic jacks, and the tensioning oil pump and the matched oil pipe are respectively connected with each tensioning feed-through hydraulic jack.
The invention also provides a disassembling method suitable for the prestressed inhaul cable, which comprises the following steps:
s1, extracting a maximum tension value of a tension device according to a construction tension value table of a cable structure; designing a dismounting device according to the maximum tension value, and performing three-dimensional model lofting and strength checking;
s2, mounting the dismounting device on a cable body of a inhaul cable, discharging a hollow cylinder by using a tensioning through hydraulic jack, and then mounting and screwing a nut component positioned at the tail part of the tensioning through hydraulic jack;
s3, starting a tensioning oil pump, pressurizing to a cable force value of the stay cable, completely preventing a cable head pin shaft at the adjusting end of the stay cable from contacting with a main lug plate of the stay cable, and pulling out the stay cable pin shaft;
s4, screwing the nut assembly in the retaining box in the direction of the tensioning penetrating hydraulic jack to enable the nut assembly to be tightly attached to a steel plate on one side, close to the tensioning penetrating hydraulic jack, of the retaining box;
s5, tensioning the through hydraulic jack and returning the cylinder, unloading until the tensioning force is zero, pressing a nut assembly in the retaining box and a steel plate on one side of the retaining box close to the bearing frame at the moment, and completing primary unloading;
s6, loosening a nut assembly at the tail of the tensioning penetrating hydraulic jack, enabling the tensioning penetrating hydraulic jack to be empty and out of the cylinder by 100mm, and then screwing the nut assembly at the tail of the tensioning penetrating hydraulic jack;
s7, starting a tensioning oil pump, pressurizing until a nut component in the retaining box is loosened from a steel plate close to one side of the bearing frame, screwing the nut component in the retaining box to the direction of the tensioning penetrating hydraulic jack, and enabling the nut component to be tightly attached to the steel plate close to one side of the tensioning penetrating hydraulic jack;
s8, tensioning the through hydraulic jack and returning the cylinder, unloading until the tensioning force is zero, pressing a nut assembly in the retaining box with a steel plate close to one side of the bearing frame at the moment, and finishing secondary unloading;
and S9, repeating the steps S6-S8, unloading in a reciprocating mode until the cable force of the inhaul cable is unloaded to be 0, and detaching the inhaul cable.
In a preferred embodiment, the method further comprises the following steps:
s10, mounting the dismounting device on a new inhaul cable;
s11, reversely repeating the steps S6-S8, and loading in a reciprocating manner until the cable force of the new inhaul cable is loaded to the design force value;
s12, detecting the internal force value of the adjacent inhaul cable of the new inhaul cable again by using the dismounting device, judging whether the adjacent inhaul cable needs to be subjected to cable force adjustment or not, and if the adjacent inhaul cable needs to be adjusted, carrying out cable force adjustment;
s13, dismantling the dismantling equipment to complete construction;
in the step S11, the cable force of the new inhaul cable is loaded to a design force value, and the error of the force value does not exceed 5%;
in step S12, the cable force value of the adjacent cables is detected and adjusted, and the error of the force value is ensured not to exceed 5%. .
In a preferred embodiment, the step S2 of installing the detaching device on the inhaul cable body comprises the steps of clamping two bearing frames on the inhaul cable body, fixedly connecting the two bearing frames through a plurality of counter bolts, enabling the inhaul cable adjusting end cable head to extend out of the tops of the bearing frames, and in the step S2, the cylinder extending amount of the tensioning penetrating hydraulic jack is larger than the length of the force transfer rod piece which is left in the retaining box and is removed from the nut assembly.
In a preferred embodiment, during the process of unloading the guy cable, a feed-through pressure sensor arranged between the retaining box and the tension feed-through hydraulic jack is used for monitoring the pressure value of the tension feed-through hydraulic jack, and the pressure error of the two tension feed-through hydraulic jacks is ensured not to exceed 5%.
Compared with the prior art, the invention has the beneficial effects that: the dismounting device suitable for the prestressed stay cable is provided with the retaining box, the bearing frame, the force transmission rod piece, the three sets of nut assemblies and the two tensioning penetrating hydraulic jacks arranged in parallel, wherein the bearing frame is a main stress component of the device, the retaining box is a core force transmission component of the device, the nut assemblies in the retaining box are twisted to smoothly unload the stay cable by applying force to the tensioning penetrating hydraulic jacks, the operation is very simple and convenient, and the dismounting device is safe and reliable, so that the problem of cable replacement caused by partial damage of the stay cable wire due to the fact that a finished product is not protected in place in a construction site is solved.
Drawings
FIG. 1 is a schematic perspective view of a detaching device for a prestressed cable according to the present invention;
FIG. 2 is an exploded view of a release device for a pre-stressed cable in accordance with the present invention;
fig. 3 is a structural schematic diagram of one of the outriggers of the invention;
FIG. 4 is a schematic structural diagram of the retaining box of the present invention;
fig. 5-11 are schematic diagrams illustrating specific processes (corresponding to steps S2-S8, respectively) of the disassembling method of the present invention.
Description of the main reference numbers:
the tension device comprises 1-a tension lug plate, 2-a stay cable main lug plate, 3-a stay cable adjusting end cable head, 4-a tension fork lug, 5-a force transmission rod component, 51-a force transmission rod component, 52-a nut component, 6-a force bearing frame, 7-a split bolt, 8-a backstop box, 9-a tension through hydraulic jack, 10-a through pressure sensor, 11-a stay cable body, 12-a stay cable boundary supporting component and 41-a pin shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without making any creative effort, belong to the protection scope of the present invention.
Example 1
As shown in fig. 1 to 4, the detaching device for a prestressed cable according to a preferred embodiment of the present invention includes: the tensioning device comprises a tensioning ear plate 1, a stay cable main ear plate 2, a tensioning fork ear 4, a dowel bar assembly 5, a force bearing frame 6, a retaining box 8 and a tensioning through hydraulic jack 9.
The two tensioning lug plates 1 are reaction members of the dismounting device, and the two tensioning lug plates 1 are symmetrically arranged on the left side and the right side of the cable main lug plate 2 and are welded with main structures on the left side and the right side of the cable main lug plate 2 or welded up and down on the cable main lug plate. The two tensioning fork lugs 4 are respectively connected with the tensioning ear plates 1 through pin shafts 41. Preferably, the tensioning ear plate 1 is made of steel plate openings, and the tensioning ear plate 1 is fixedly connected with the cable boundary supporting members 12 on the left side and the right side of the cable main ear plate 2. The design of the tensioning ear plate 1 is determined by the cable head size of the inhaul cable and the tensioning force of the inhaul cable, and the steel plate configuration and the size of the tensioning ear plate 1 are finally determined by finite element simulation calculation.
Furthermore, the tensioning fork lug 4 is of a U-shaped structure, pin holes 42 are symmetrically formed in two side plates of an opening end of the U-shaped structure and used for penetrating the pin shaft 41, and a through hole is formed in a bottom plate of the U-shaped structure and used for penetrating the force transmission rod piece 51.
The bearing frame 6 is a main stress component of the dismounting device, the middle part and two sides of the bearing frame 6 are respectively provided with a first channel 61 and a second channel 62, and the first channel 61 is used for penetrating the inhaul cable body 11. Preferably, the bearing frame 6 is formed by assembling two-piece structures, a top plane and a bottom plane are formed, and the two bearing frames 6 clamp the inhaul cable body 11 and are fixedly connected through the counter bolts 7. Every load-bearing frame 6 all adopts the welding of polylith steel sheet to form, and has seted up a plurality of bolt holes 63 on two load-bearing frames 6 correspondingly, and a plurality of bolt holes 63 are established in the both sides of first passageway 61 along multirow multiseriate interval.
The two retaining boxes 8 are core force transmission components of the dismounting device, the two retaining boxes 8 are symmetrically arranged on two sides of the bottom of the bearing frame 6, the force transmission rod assemblies 5 are provided, the number of the force transmission rod assemblies 5 is two, and each set of the force transmission rod assembly 5 comprises a force transmission rod piece 51 and a nut assembly 52 matched with the force transmission rod piece.
Further, the nut assemblies 52 comprise three sets, the first set of nut assemblies 52 are used for connecting the dowel assembly 5 and the tensioning fork lug 4, the second set of nut assemblies 52 are arranged in the retaining box 8, and the third set of nut assemblies 52 are arranged at the tail part of the tensioning penetrating hydraulic jack 9.
Further, the stopping box 8 is a hollow box structure formed by welding a plurality of steel plates, through holes 81 are correspondingly formed in the top and the bottom of the stopping box 8 and used for penetrating the force transmission rod piece 51, and each stopping box 8 and the bearing frame 6 are clamped tightly through the nut component 52 arranged in the stopping box 8 and the bearing frame. The design of the retaining box 8 is determined by the diameter of the force transmission rod piece 51, the size of the matched nut component, the size of an oil cylinder of a tensioning jack and the size of tensioning force of a stay cable, and the size of the steel plate of the retaining box is finally determined through finite element simulation calculation.
The retaining box 8 is a key part for realizing repeated unloading, and the height of the retaining box 8 and the height of the nut component determine the stroke of one unloading, and preferably, the height of the retaining box 8 is equal to the height of 2 or 2.5 nut components 52. Meanwhile, the length of the force transmission rod piece 51 determines whether the cable force can be completely unloaded, so that the length of the force transmission rod piece 51 is comprehensively considered according to the unloading stroke and the assembling length of the whole component, the unloading is ensured to be completed smoothly, and preferably, the length of the force transmission rod piece 51 is 3-4 meters.
Furthermore, each force transmission rod piece 51 is finish-rolled deformed steel bar or steel pull rod, the material of each force transmission rod piece 51 is 40Cr, and the material is subjected to thermal refining treatment, and the breaking force of each force transmission rod piece 51 at least meets 1.5 times of the tension force of the stay cable.
The tensioning penetrating hydraulic jack 9 is an unloading device of the dismounting device, and the two tensioning penetrating hydraulic jacks 9 are sleeved on the two force transmission rod pieces 51 in parallel. One end of the force transmission rod piece 51 is connected with the tensioning fork ear 4, and the other end of the force transmission rod piece respectively penetrates through the second channel 62 of the bearing frame 6, the retaining box 8 and the tensioning penetrating hydraulic jack 9. The jack is configured according to the tension force of the inhaul cable.
Furthermore, the dismounting device of the invention also comprises a tensioning oil pump and a matched oil pipe, wherein the tensioning oil pump and the matched oil pipe are respectively connected with each tensioning through hydraulic jack 9.
Example 2
In a preferred embodiment, the dismounting device of the invention further comprises a feed-through pressure sensor 10, the feed-through pressure sensor 10 being arranged between the backstop box 8 and the tension feed-through hydraulic jack 9. In the process of unloading the guy cable, a feed-through pressure sensor 10 arranged between a retaining box 8 and a tension feed-through hydraulic jack 9 is used for monitoring the pressure value of the tension feed-through hydraulic jack 9, and the pressure error of the two tension feed-through hydraulic jacks 9 is ensured not to exceed 5%, so that the situation that the device generates internal unbalanced force due to overlarge stress of the jack on one side, unnecessary rework is caused due to difficulty in dismounting the guy cable is prevented, meanwhile, the loading force value of the tension feed-through hydraulic jack 9 can be timely adjusted, and the situation that the device is damaged irreversibly due to overlarge internal unbalanced force is prevented.
Example 3
As shown in fig. 5 to 11, the present invention further provides a disassembling method for a prestressed cable, comprising the following steps:
s1, extracting a maximum tension value of a tension device according to a construction tension value table of a cable structure; and designing a dismounting device according to the maximum tension value, and performing three-dimensional model lofting and strength checking.
And S2, installing the dismounting device on the guy cable body 11, discharging a hollow cylinder by using the tensioning penetrating hydraulic jack 9, wherein the cylinder discharging amount b of the tensioning penetrating hydraulic jack 9 is larger than the length a of the force transmission rod piece 51 which is removed from the nut component 52 in the retaining box 8, namely b is larger than a, and then installing and screwing the nut component 52 at the tail part of the tensioning penetrating hydraulic jack as shown in figure 5.
Further, in step S2, the step of mounting the dismounting device on the cable body 11 includes clamping the cable body 11 by the two force-bearing frames 6, and fixedly connecting the two force-bearing frames 6 by the plurality of tie bolts 7, wherein the cable head 3 at the cable adjusting end of the cable extends out of the top of the force-bearing frame 6.
And S3, starting the tensioning oil pump, pressurizing to a cable force value, completely preventing the cable pin 31 from being in contact with the cable main lug plate 2, and pulling out the cable pin 31 as shown in fig. 6.
And S4, screwing the nut component 52 in the retaining box 8 towards the tensioning penetrating hydraulic jack 9, so that the nut component 52 is tightly attached to the steel plate on one side, close to the tensioning penetrating hydraulic jack 9, of the retaining box 8, as shown in FIG. 7.
And S5, tensioning the cylinder of the through hydraulic jack 9, unloading until the tensioning force is zero, pressing the nut component 52 in the retaining box 8 and the steel plate of the retaining box 8 close to one side of the bearing frame 6 at the moment, and finishing first-stage unloading as shown in FIG. 8.
And S6, loosening the nut component 52 at the tail part of the tensioning penetrating hydraulic jack 9, enabling the tensioning penetrating hydraulic jack 9 to be out of the cylinder by 100mm, and screwing the nut component 52 at the tail part of the tensioning penetrating hydraulic jack 9, as shown in fig. 9.
And S7, starting the tensioning oil pump, pressurizing until the nut component 52 in the retaining box 8 is loosened from the steel plate close to one side of the bearing frame 6, and screwing the nut component 52 in the retaining box 8 towards the tensioning and piercing hydraulic jack 9 so as to enable the nut component to be tightly attached to the steel plate close to one side of the tensioning and piercing hydraulic jack 9, as shown in FIG. 10.
And S8, returning the tensioning through hydraulic jack 9 to the cylinder, unloading until the tensioning force is zero, pressing the nut component 52 in the retaining box 8 with the steel plate close to one side of the bearing frame 6 at the moment, and finishing secondary unloading, as shown in fig. 11.
And S9, repeating the steps S6-S8, unloading in a reciprocating mode until the cable force of the inhaul cable is unloaded to be 0, and detaching the inhaul cable.
Further, the method also comprises the following steps: step S10, mounting a dismounting device on a new inhaul cable;
s11, reversely repeating the steps S6-S8, and loading in a reciprocating manner until the cable force of the new inhaul cable is loaded to the design force value;
s12, detecting the internal force value of the adjacent inhaul cable of the new inhaul cable again by using the dismounting device, judging whether the adjacent inhaul cable needs to be subjected to cable force adjustment or not, and if the adjacent inhaul cable needs to be adjusted, carrying out cable force adjustment;
and S13, dismantling the dismantling equipment to finish construction.
In step S11, the new stay cable force is loaded to the design force value, and the error of the force value is not more than 5%. In step S12, the cable force value of the adjacent cables is detected and adjusted, and the error of the force value is ensured not to exceed 5%.
Furthermore, in the process of unloading the stay cable, a pressure value of the tensioning penetrating hydraulic jack 9 is monitored by using a penetrating pressure sensor arranged between the retaining box 8 and the tensioning penetrating hydraulic jack 9, the pressure error of the two tensioning penetrating hydraulic jacks 9 is ensured to be not more than 5%, the phenomenon that the device generates internal unbalanced force due to overlarge stress of the jack on one side is prevented, unnecessary rework is caused due to difficulty in disassembling the stay cable, meanwhile, the loading force value of the tensioning penetrating hydraulic jack 9 can be timely adjusted, and the device is prevented from being damaged irreversibly due to overlarge internal unbalanced force.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A disassembly method suitable for a prestressed inhaul cable is characterized in that: the method comprises the following steps:
s1, extracting a maximum tension value of a tension device according to a construction tension value table of a cable structure; designing a dismounting device according to the maximum tension value, and performing three-dimensional model lofting and strength checking;
s2, mounting the dismounting device on a guy cable body (11), discharging a hollow cylinder by using a tensioning through hydraulic jack (9), and then mounting and screwing a nut component (52) positioned at the tail part of the tensioning through hydraulic jack;
s3, starting a tensioning oil pump, pressurizing to a cable force value of the stay cable, completely preventing a cable head pin shaft at the adjusting end of the stay cable from being in contact with a main lug plate (2) of the stay cable, and pulling out the stay cable pin shaft;
s4, screwing the nut component (52) in the retaining box (8) to the direction of the tensioning penetrating hydraulic jack (9) so that the nut component (52) is tightly attached to a steel plate on one side, close to the tensioning penetrating hydraulic jack (9), of the retaining box (8);
s5, the tensioning penetrating hydraulic jack (9) returns to the cylinder, unloading is carried out until the tensioning force is zero, at the moment, a nut component (52) in the stopping box (8) is tightly pressed with a steel plate on one side, close to the bearing frame (6), of the stopping box (8), and first-stage unloading is finished;
s6, loosening a nut component (52) at the tail of the tensioning penetrating hydraulic jack (9), enabling the tensioning penetrating hydraulic jack (9) to be out of a cylinder by 100mm, and screwing the nut component (52) at the tail of the tensioning penetrating hydraulic jack (9);
s7, starting a tensioning oil pump, pressurizing until a nut component (52) in the retaining box (8) is loosened from a steel plate close to one side of the bearing frame (6), screwing the nut component (52) in the retaining box (8) to the direction of the tensioning penetrating hydraulic jack (9), and enabling the nut component to be tightly attached to the steel plate close to one side of the tensioning penetrating hydraulic jack (9);
s8, the tensioning penetrating hydraulic jack (9) returns to the cylinder, unloading is carried out until the tensioning force is zero, at the moment, the nut component (52) in the stopping box (8) is tightly pressed with the steel plate close to one side of the bearing frame (6), and secondary unloading is finished;
s9, repeating the steps S6-S8, unloading in a reciprocating manner until the cable force of the inhaul cable is unloaded to be 0, detaching the inhaul cable,
in the step S2, the step of installing the dismounting device on the inhaul cable body (11) comprises the steps of clamping the inhaul cable body (11) by the two bearing frames (6), fixedly connecting the two bearing frames (6) through a plurality of counter bolts (7), extending a cable head (3) at the cable adjusting end outside the top of the bearing frame (6), and in the step S2, the cylinder discharging amount of the tensioning center-penetrating hydraulic jack (9) is larger than the length of a force transferring rod piece (51) which is left in the stopping box (8) and is removed from the nut component (52),
in the process of unloading the guy cable, a feed-through pressure sensor arranged between a retaining box (8) and a tension feed-through hydraulic jack (9) is used for monitoring the pressure value of the tension feed-through hydraulic jack (9), the pressure error of the two tension feed-through hydraulic jacks (9) is ensured not to exceed 5 percent, the phenomenon that the device generates internal unbalanced force due to overlarge stress of the jack on one side is prevented, the guy cable is difficult to disassemble and rework is caused, meanwhile, the loading force value of the tension feed-through hydraulic jack can be timely adjusted, and the device is prevented from being damaged irreversibly due to overlarge internal unbalanced force.
2. The disassembling method for the prestressed stay cable according to claim 1, wherein: also comprises the following steps:
s10, mounting the dismounting device on a new inhaul cable;
s11, reversely repeating the steps S6-S8, and loading in a reciprocating manner until the cable force of the new inhaul cable is loaded to the design force value;
s12, detecting the internal force value of the adjacent inhaul cable of the new inhaul cable again by using the dismounting device, judging whether the adjacent inhaul cable needs to be subjected to cable force adjustment or not, and if the adjacent inhaul cable needs to be adjusted, carrying out cable force adjustment;
s13, dismantling the dismantling equipment to complete construction;
in the step S11, a new stay cable force is loaded to a design force value, and the error of the design force value is not more than 5%;
in step S12, the cable force values of adjacent cables are detected and adjusted, and the error of the cable force value is not more than 5%.
3. A dismounting device for use in a dismounting method for a prestressed guy cable according to claim 1 or 2, characterized in that: the detaching device includes:
the two tensioning ear plates (1) are symmetrically arranged on the left side and the right side of the main ear plate (2) of the inhaul cable and are fixedly connected with main body structures on the left side and the right side of the main ear plate (2) of the inhaul cable;
the two tensioning fork lugs (4) are respectively connected with the tensioning lug plate (1) through pin shafts (41);
the cable comprises a bearing frame (6), wherein a first channel (61) and a second channel (62) are respectively arranged in the middle and on two sides of the bearing frame (6), and the first channel (61) is used for penetrating a cable body (11);
the two retaining boxes (8) are symmetrically arranged on two sides of the bottom of the bearing frame (6);
the number of the dowel bar assemblies (5) is two, and each dowel bar assembly (5) comprises a dowel bar (51) and a nut assembly (52);
the two tensioning through hydraulic jacks (9) are sleeved on the two force transmission rod pieces (51) in parallel;
wherein one end of the force transmission rod piece (51) is connected with the tensioning fork ear (4), the other end of the force transmission rod piece respectively penetrates through a second channel (62) of the bearing frame (6), the retaining box (8) and the tensioning penetrating hydraulic jack (9),
the hydraulic tensioning device is characterized by further comprising a feed-through pressure sensor, a tensioning oil pump and a matched oil pipe, wherein the feed-through pressure sensor is arranged between the retaining box (8) and the tensioning feed-through hydraulic jacks (9), the tensioning oil pump and the matched oil pipe are respectively connected with each tensioning feed-through hydraulic jack (9),
in the process of unloading the stay cable, the pressure value of the tensioning through hydraulic jack is monitored by using a through pressure sensor arranged between the retaining box and the tensioning through hydraulic jack, the pressure error of the two tensioning through hydraulic jacks is ensured not to exceed 5%, the phenomenon that the device generates internal unbalanced force due to overlarge stress of the jack on one side is prevented, so that the rework is caused due to the difficulty in disassembling the stay cable, meanwhile, the loading force value of the tensioning through hydraulic jack can be timely adjusted, and the irreversible damage to the device due to the overlarge internal unbalanced force is prevented.
4. The dismounting device of claim 3, wherein: nut component (52) include three sets, and first set nut component (52) are used for the connection of dowel steel subassembly (5) and stretch-draw fork ear (4), the second set nut component (52) set up in stopping box (8), the third set nut component (52) set up the afterbody of stretch-draw hydraulic jack (9) of punching.
5. The dismounting device of claim 4, wherein: stopping box (8) are the hollow box body structure that the polylith steel sheet welding formed, the through-hole has been seted up with the bottom correspondence of stopping box (8) for wear to establish pass power member spare (51), and every stopping box (8) with bearing frame (6) are tight through nut component (52) clamp.
6. The dismounting device of claim 5, wherein: bearing frame (6) are two formula structures, two the bearing frame cliies cable body (11) to through a plurality of split bolt (7) fixed connection, two bearing frame (6) all adopt the polylith steel sheet welding to form, and two a plurality of bolt holes (63), a plurality of have been seted up to correspondence on bearing frame (6), and are a plurality of bolt hole (63) are established along multirow multiseriate interval the both sides of first passageway (61).
7. The disassembly apparatus of claim 6, wherein: stretch-draw fork ear (4) are the U-shaped structure, and pinhole (42) have been seted up to the open end both sides board symmetry of U-shaped structure for wear to establish round pin axle (41), the through-hole has been seted up to the bottom plate of U-shaped structure, is used for wearing to establish power member (51), every power member (51) are finish rolling screw-thread steel or steel pull rod, every the material of power member (51) is 40Cr to through the quenching and tempering, and every power member (51) breaking force's size needs to satisfy 1.5 times's cable tensioning force at least.
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| CN202210823030.7A CN114892994B (en) | 2022-07-14 | 2022-07-14 | Dismounting device and method suitable for prestressed inhaul cable |
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| CN115506598A (en) * | 2022-10-31 | 2022-12-23 | 中冶(上海)钢结构科技有限公司 | Computer-controlled multi-beam chord beam synchronous tensioning method |
| CN115992566B (en) * | 2023-03-23 | 2023-05-30 | 北京市建筑工程研究院有限责任公司 | Rigid-flexible orthogonal cable network structure and forming method thereof |
| CN116296014B (en) * | 2023-05-18 | 2023-09-05 | 北京市建筑工程研究院有限责任公司 | Device and method suitable for effective prestress equivalent nondestructive testing of existing structure |
| CN117306874B (en) * | 2023-10-24 | 2024-05-24 | 北京市建筑工程研究院有限责任公司 | Automatic loading device for prestress structural cable and control method thereof |
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| FR2904637A1 (en) * | 2006-08-02 | 2008-02-08 | Freyssinet Soc Par Actions Sim | METHOD FOR DISASSEMBLING A TENSILE CABLE, SYSTEM AND ASSOCIATED DEVICES |
| CN105507596A (en) * | 2015-12-04 | 2016-04-20 | 上海同程建设科技工程有限公司 | Bidirectional rotatable tractive tool device for prestressed steel structure construction |
| CN205870848U (en) * | 2016-07-19 | 2017-01-11 | 中国铁道科学研究院铁道建筑研究所 | Single automatic stretch -draw locking device on same group |
| CN111894302A (en) * | 2020-08-17 | 2020-11-06 | 哈尔滨工业大学 | Cable dismantling device and method |
| CN114541776B (en) * | 2022-04-28 | 2022-07-12 | 北京市建筑工程研究院有限责任公司 | Stay cable lifting and tensioning conversion device and construction method thereof |
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