CN108612313B - Automatic control method for intelligent prestress tensioning - Google Patents
Automatic control method for intelligent prestress tensioning Download PDFInfo
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- CN108612313B CN108612313B CN201810454743.4A CN201810454743A CN108612313B CN 108612313 B CN108612313 B CN 108612313B CN 201810454743 A CN201810454743 A CN 201810454743A CN 108612313 B CN108612313 B CN 108612313B
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- tensioning
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an intelligent prestress tensioning automatic control method, which comprises the steps of installing a tensioning device; the step of tensioning construction of the prestressed tendon by a tensioning device; a step for locking the prestressed tendons by a tensioning device; and the intelligent control step is used for the controller to perform tensioning construction intelligent control. The tensioning system has the advantages that the tensioning expansion part of the bidirectional jack works firstly, the prestressed tendon is tensioned to a preset stress value, then the jacking expansion part works to push the reverse pressing plate to jack the working jacket, so that the working anchor clamps the prestressed tendon, the sliding of the prestressed tendon can be reduced, and compared with a traditional tensioning system, the tensioning system can reduce stress loss, avoid excessive tensioning, better control the tensioning process and improve the tensioning effect, and is combined with a controller to realize intelligent tensioning monitoring and control, intelligent and convenient, and high in control accuracy.
Description
Technical Field
The invention relates to the technical field of building and bridge construction, in particular to an automatic control method for intelligent prestress tensioning.
Background
The prestress tensioning technology is widely applied to construction of buildings and bridges, the occurrence and the expansion process of cracks of a concrete matrix can be slowed down by adopting prestress construction, and the service life is prolonged. However, the pre-stress tension construction process has high requirements on materials and construction processes, and the problem of pre-stress loss is easy to occur. When the prestress loading is finished, the clamp and the anchor ring can be fastened only by the resilience of the prestressed tendon, so that the loaded prestress is lost. In order to solve the problem of prestress loss in the construction process at present, an over-tensioning method is often needed, namely the maximum stress of tensioning loading is larger than a design value. However, the over-tensioning method often does not determine the stress loss amount, cannot ensure that the final stress meets the design requirements, and is easy to break the prestressed tendons or damage the anchorage device, and the problem cannot be solved perfectly by the over-tensioning method. On the other hand, in engineering, a plurality of prestressed tendons are often required to be simultaneously tensioned on one prestressed concrete beam body, and the assembly of the prestressed tendons and the anchor ring is very inconvenient. Therefore, there is still a need to improve the structural design of the prestressed anchorage device and the tensioning system, so as to provide convenience for prestressed tensioning construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent prestress tension monitoring and controlling system.
The technical scheme is as follows:
the intelligent prestress tensioning automatic control method is characterized by comprising the following steps: a step for installing a tensioning device; the step of tensioning construction of the prestressed tendon by a tensioning device; a step for locking the prestressed tendons by a tensioning device; and the intelligent control step is used for the controller to perform tensioning construction intelligent control.
The tensioning device comprises an anchor backing plate assembly, a working anchor assembly, a reverse pressing plate, a jack and a tool anchor assembly; the anchor backing plate assembly, the working anchor assembly, the reverse pressing plate, the jack and the tool anchor assembly are sequentially abutted and sleeved on all the prestressed tendons along the tensioning direction.
Further, the jack is a bidirectional jack, which includes a cylinder body, two telescopic parts are arranged on the cylinder body, the telescopic directions of the two telescopic parts are opposite, and the two telescopic parts respectively form a stretching telescopic part and a jacking telescopic part; the telescopic lengths of the two telescopic parts of the jack are controlled by a controller; the tool anchor assembly is installed on the stretching and stretching part, and the reverse pressing plate is installed on the jacking and stretching part; a first displacement sensor is arranged on the stretching telescopic part and connected with a first displacement input end of the controller; the working anchor assembly comprises a working anchor ring and a working jacket, a working anchor hole is formed in the working anchor ring in a penetrating mode, and the working jacket is matched with the working anchor hole; the working anchor ring comprises a backing plate surface and a pressure bearing surface, the backing plate surface abuts against the anchor backing plate assembly, the pressure bearing surface faces the reverse pressing plate, the working jacket is inserted into the working anchor hole from the pressure bearing surface, and the jacking telescopic part pushes the reverse pressing plate to jack the working jacket; and a second displacement sensor is arranged on the top pressure telescopic part and is connected with a second displacement input end of the controller.
The design more than adopting, its advantage lies in that prestressed tendons passes anchor backing plate subassembly in proper order, the work anchor subassembly, reverse pressure strip, jack and instrument anchor subassembly, each work piece is mutually supported, realize prestressed tendons's centre gripping, the stretch-draw pars contractilis of two-way jack works earlier, stretch-draw prestressed tendons to predetermined stress value, then the work of roof pressure pars contractilis, promote reverse pressure strip roof pressure work and press from both sides the cover, thereby make the work anchor press from both sides tight prestressed tendons, can reduce prestressed tendons's slip, for traditional tensioning system, this scheme can reduce loss of stress, avoid excessive stretch-draw, control the tensioning process better and improve the tensioning effect. Through the jack, stretch-draw at least one prestressing tendons to the working process of jack receives the control of controller, and the automatic monitoring of the displacement of two pars contractilis realizes real time control's effect, improves stretch-draw reliability.
The reverse compression plate comprises a compression plate body, the compression plate body comprises an assembly surface and a pressing surface, the assembly surface faces the inner end of the telescopic cylinder of the jacking and stretching part, a compression boss is arranged on the pressing surface, a prestressed tendon through hole is arranged at the center of the compression boss, and two ends of the prestressed tendon through hole are respectively opened on the end surface of the compression boss and the assembly surface; a pressing butt joint blind hole corresponding to the pressing boss is arranged on the pressure bearing surface of the working anchor ring, the bottom of the pressing butt joint blind hole penetrates through the working anchor hole, the working anchor hole is in a round table shape, one end with a larger inner diameter of the working anchor hole is opened in the pressing butt joint blind hole, and the other end with a smaller inner diameter of the working anchor hole is opened on the pad surface; the outer wall of the working clamping sleeve is in a circular truncated cone shape matched with the inner wall of the working anchor hole, a prestressed rib anchoring hole is formed in the center of the working clamping sleeve, the working clamping sleeve is formed by annularly assembling at least two working clamping pieces, the diameter of the large head end of the working clamping sleeve is larger than the maximum inner diameter of the working anchor hole and smaller than the inner diameter of the pressing butt joint blind hole, the large head end of the working clamping sleeve extends out of the working anchor hole and then falls into the pressing butt joint blind hole, and the pressing boss presses the large head end face of the working clamping sleeve.
By adopting the design, the clamping device has the advantages that the clamping butt-joint blind hole provides a yielding space for the compression boss, the compression boss can be conveniently and actively pressed against the corresponding working jacket, and the clamping of the prestressed rib can be effectively realized by the matching of the clamping piece type working jacket and the working anchor hole.
Further, a positioning mechanism is arranged between the reverse pressing plate and the working anchor ring, the positioning mechanism comprises an anchor ring positioning rod arranged on the pressing plate body and a positioning hole arranged on the working anchor ring, and the anchor ring positioning rod is matched with the positioning hole; the anchor ring positioning rod is vertically arranged on the pressure applying surface of the pressing plate body, the positioning hole is arranged on the pressure bearing surface of the working anchor ring, and the positioning hole is a blind hole. By adopting the design, the anchor ring positioning rod has the advantage that the anchor ring positioning rod can guide the reverse pressing plate to stably approach and press the working clamping piece.
Further, at least one prestressed tendon through hole is arranged on a cylinder body of the bidirectional jack in a penetrating mode, prestressed tendon clamping holes are respectively formed in the two telescopic parts corresponding to the prestressed tendon through holes, the prestressed tendon clamping holes located on the stretching telescopic parts form anchor ring fixing holes, the prestressed tendon clamping holes located on the jacking telescopic parts form compression plate fixing holes, and the reverse compression plate is installed in the compression plate fixing holes; the cylinder body comprises an outer sleeve and an inner sleeve which are coaxially sleeved, a prestressed rib through hole is formed in an inner cavity of the inner sleeve, a cylindrical oil chamber is formed between the outer sleeve and the inner sleeve, an oil chamber isolating ring is arranged in the middle of the oil chamber and fixedly connected with the outer wall of the inner sleeve and the inner wall of the outer sleeve respectively, the oil chamber isolating ring divides the oil chamber into two piston cavities, two telescopic parts respectively extend into the two piston cavities from two ends of the oil chamber, the two ends of the oil chamber and the corresponding telescopic parts are sealed, and a pipe and an oil return pipe are arranged on the outer sleeve corresponding to each piston cavity respectively; the telescopic part comprises an annular piston and a telescopic cylinder, wherein the annular piston is annularly arranged in the piston cavity, the inner end of the telescopic cylinder is along the central line direction of the cylinder body and extends into the piston cavity and is connected with the annular piston, the telescopic cylinder is provided with a sealing element between the outer sleeve and the inner sleeve, the oil injection pipe and the oil return pipe are respectively positioned at two sides of the annular piston, and the inner cavity of the telescopic cylinder forms the prestressed tendon clamping hole.
By adopting the design, the piston has the advantages that the two separated piston cavities are matched with the two telescopic parts to form two independent telescopic parts which work independently. The jacking and the resetting of a telescopic cylinder can be realized by adopting a simple structural design.
Further describing, the oil inlet ends of the two oil filling pipes are respectively connected with two oil pumps, and the two oil pumps pump oil in the oil drum; the oil outlet ends of the two oil return pipes extend into the oil drum, and the two oil pumps are connected with the two jacking control ends of the controller; two oil filling pipes are provided with oil flow sensors: the oil flow controller comprises a first oil flow sensor and a second oil flow sensor, wherein the first oil flow sensor and the second oil flow sensor are respectively connected with two flow signal input ends of the controller. The oil flow sensor is used for acquiring the oil amount extracted by the oil pump to control the telescopic length of the two telescopic parts, and the first displacement sensor and the second displacement sensor are combined to correct the moving distance, so that the tensioning process of the jack is more accurate.
Described further still, the tool anchor assembly includes a tool anchor ring and a tool collet; a tool anchor hole penetrates through the tool anchor ring, the tool anchor hole is in a circular truncated cone shape, one end with a larger inner diameter of the tool anchor hole is opened on the working surface, and one end with a smaller inner diameter of the tool anchor hole is opened on the mounting surface; the tool clamping sleeve is in a circular truncated cone shape which is matched with the inner wall of the tool anchor hole, the tool clamping sleeve is arranged in the tool anchor hole, and a prestressed rib engaging hole which has the same hole center line with the tool anchor hole is arranged in the tool clamping sleeve in a penetrating mode; the tool clamping sleeve is formed by annularly assembling at least two tool clamping pieces, the large head end of the tool clamping sleeve is connected with a clamping piece lifting assembly, the small head end of the tool clamping sleeve is connected with a clamping piece resetting piece, and a lifting operation piece is arranged between the clamping piece lifting assembly and the tool anchor ring; the inner wall of the tool anchor hole is provided with clamping piece guide sliding grooves along the direction of the circular truncated cone generatrix, the clamping piece guide sliding grooves correspond to the tool clamping pieces one by one, the openings of the clamping piece guide sliding grooves contract inwards, and sliding guide pieces are respectively arranged in the clamping piece guide sliding grooves and are connected with the corresponding tool clamping pieces; the clamping piece that resets is the elasticity piece that resets, the instrument clamping piece is connected with respectively the elasticity piece that resets, and this elasticity resets and is in along its length direction setting in the clamping piece direction spout, the one end that the elasticity resets with the inner wall of clamping piece direction spout links to each other, the other end that the elasticity resets with the instrument clamping piece links to each other, the elasticity reset with the link of clamping piece direction spout inner wall is close to the installation face, the elasticity resets and keeps away from with the link of instrument clamping piece the installation face.
Set up the clamping piece and carry and draw the subassembly and carry and draw the operating parts and can conveniently stimulate the instrument clamping piece to the major part end direction of instrument anchor eye to enlarge prestressing tendons interlock hole, conveniently wear to establish prestressing tendons, after finishing using, the clamping piece that resets can help the instrument clamping piece to reply in the work anchor eye. The sliding guide piece slides in the clamping piece guide sliding groove, so that each tool clamping piece can be guided to slide along the direction of the circular truncated cone bus, the stability of the sliding of the tool clamping pieces is kept, and the interference and dislocation among a plurality of clamping pieces are avoided; after the tool clamping piece slides to a position far away from the installation surface, the clamping piece can automatically return to the original position under the elastic action of the elastic resetting piece.
As a preferred technical scheme, the clamping piece lifting assembly comprises a clamping piece lifting plate and a lifting connecting piece, wherein the clamping piece lifting plate is positioned on one side of the working surface of the tool anchor ring, prestressed tendon through holes corresponding to the tool anchor holes are formed in the clamping piece lifting plate, the tool clamping pieces are respectively connected with the lifting connecting piece, and two ends of the lifting connecting piece are respectively connected with the tool clamping pieces and the clamping piece lifting plate; the lifting operation piece comprises a push-pull rod, the push-pull rod is perpendicular to the clamping piece lifting plate, one end of the push-pull rod is in threaded connection with the tool anchor ring, the other end of the push-pull rod movably penetrates through the clamping piece lifting plate, an expansion part is arranged in the middle of the push-pull rod, and the expansion part is located between the clamping piece lifting plate and the tool anchor ring; and the working surface is provided with a abdication notch corresponding to the expansion part. By adopting the scheme, the push-pull rod is rotated to be away from the tool anchor ring, the expansion part pushes the clamping piece lifting plate to be away from the tool anchor ring, all the tool clamping pieces can be driven to slide synchronously, the prestressed tendon meshing hole is expanded, and after the use is finished, the expansion part can be accommodated in the yielding notch without influencing the restoration position of the tool clamping pieces.
Further, an installation clamping ring is arranged in the prestressed tendon clamping hole close to the outer end of the telescopic cylinder, the central line of the installation clamping ring is overlapped with the central line of the telescopic cylinder, and an abutting chamfer is arranged on the outer end face of the installation clamping ring; the assembling surface of the pressing plate body abuts against the outer end surface of the mounting snap ring on the telescopic cylinder of the jacking telescopic part, and the edge of the assembling surface of the pressing plate body is provided with an annular assembling chamfer matched with the abutting chamfer; the mounting surface of the tool anchor ring abuts against the outer end surface of the mounting snap ring on the telescopic cylinder of the tensioning telescopic part, and the edge of the mounting surface of the tool anchor ring is provided with an annular mounting chamfer matched with the abutting chamfer; at least one pair of positioning magnet pairs is arranged between the telescopic cylinder of the top pressure telescopic part and the pressing plate body, and at least one pair of positioning magnet pairs is also arranged between the telescopic cylinder of the tension telescopic part and the tool anchor ring; the positioning magnet pair comprises a main positioning magnet and a secondary positioning magnet, and the main positioning magnet is respectively arranged on the chamfer inclined plane abutting against the chamfer; the auxiliary positioning magnet comprises a pressing plate auxiliary positioning magnet arranged at an annular assembling chamfer of the pressing plate body, an anchor ring auxiliary positioning magnet arranged at an annular mounting chamfer of the tool anchor ring, and an anchor ring auxiliary positioning magnet arranged at an annular mounting chamfer of the tool anchor ring; the bidirectional jack further comprises a supporting cylinder arranged with the cylinder body at the same center line, the outer edge of the outer sleeve on one side of the jacking telescopic part is connected with the inner edge of the supporting cylinder, an outward flange is arranged on the outer edge of the supporting cylinder, an annular groove matched with the flange is arranged on the bearing surface of the working anchor ring, and the annular groove is arranged around the compression butt joint blind hole.
By adopting the scheme, the structure and the auxiliary positioning mechanism which are matched with each other can facilitate the assembly of the tool anchor assembly, the tensioning telescopic part of the jack, the reverse pressing plate, the jacking telescopic part of the jack and the working anchor ring.
Still further described, the anchor backing plate assembly comprises an anchor backing plate, a first spiral stirrup and a second spiral stirrup, wherein the anchor backing plate comprises an anchor backing plate body and a flared tube; the anchor backing plate body comprises a bearing surface and a supporting surface which are arranged in a back-to-back mode, a prestressed tendon through hole is formed in the center of the anchor backing plate body, a circle of anchor ring bayonet is formed in the bearing surface of the anchor backing plate body around the prestressed tendon through hole, and the working anchor ring falls in the anchor ring bayonet; the large head end of the horn tube is connected to the abutting surface of the anchor backing plate body, the first spiral stirrup is concentrically sleeved outside the horn tube, a flange is annularly arranged on the outer wall of the small head end of the horn tube, the second spiral stirrup is arranged on one side of the flange, and the second spiral stirrup is positioned on one side, away from the anchor backing plate body, of the flange; the first spiral stirrup and the second spiral stirrup are opposite in rotation direction, the first spiral stirrup is close to one end of the anchor backing plate body and connected with the anchor backing plate body in a spot welding mode, and the second spiral stirrup is close to one end of the flange and connected with the flange in a spot welding mode.
Adopt above-mentioned scheme, because the anchor region belongs to stress concentration district, compare in traditional anchor backing plate subassembly, this scheme can strengthen the power of holding to the concrete base member of anchor backing plate below through setting up two spiral stirrups, improves this stress concentration regional concrete intensity.
Further describe, still include the removal monitoring subassembly, this removal monitoring subassembly is fixed to be set up on the stretch-draw extension line of instrument anchor subassembly, the removal monitoring subassembly includes at least one prestressing tendons via hole, all is provided with prestressing tendons displacement sensor in every prestressing tendons via hole, all prestressing tendons displacement sensor all with the controller is connected. By adopting the scheme, the mobile monitoring assembly is arranged on the tensioning extension line of the tool anchor assembly, and the distance between the mobile monitoring assembly and the tool anchor assembly is greater than the maximum tensioning length of the tensioning telescopic part. The stretching displacement of any prestressed reinforcement position is detected by moving all prestressed reinforcement displacement sensors on the monitoring assembly, when the distance detected by any prestressed reinforcement displacement sensor is unequal to the stretching distance, the stretching assembly breaks down and the alarm gives an alarm if the stretching assembly slides relatively or falls off in the stretching process. The intelligent prestress tension monitoring and controlling system is used for prompting workers to detect the intelligent prestress tension monitoring and controlling system and reducing the failure rate.
The steps for installing the tensioning device are as follows:
s11: fixing an anchor backing plate component of a tensioning device at the end part of a bridge body;
the anchor backing plate assembly comprises an anchor backing plate, a first spiral stirrup and a second spiral stirrup, wherein the first spiral stirrup and the second spiral stirrup are arranged on the anchor backing plate;
s12: installing a working anchor assembly; abutting the working anchor ring backing plate surface of the working anchor assembly against the anchor ring bayonet of the bearing surface of the anchor backing plate body; a working anchor hole is formed in the working anchor ring in a penetrating mode, and the working clamping sleeve is arranged in the working anchor hole;
s13: installing a reverse pressing plate and a jack;
pressing the pressing boss of the reverse pressing plate correspondingly to the butt-joint blind hole on the pressure bearing surface of the working anchor ring, wherein the top pressing telescopic part of the jack is abutted to the assembling surface of the reverse pressing plate;
s14: installing a tool anchor assembly;
the tool anchor assembly is fixed on the jack stretching and retracting part, a tool clamping sleeve of the tool anchor assembly is arranged in a tool anchor hole of a tool anchor ring of the tool anchor assembly, a small head end of the tool clamping sleeve is connected with the tool anchor ring through a clamping piece resetting piece, a large head end of the tool clamping sleeve is connected with a clamping piece lifting plate of the tool anchor assembly through a lifting connecting piece, and a push-pull rod is connected between the clamping piece lifting plate and the tool clamping sleeve.
The method for tensioning the prestressed tendon by the tensioning device comprises the following steps:
s21: penetrating prestressed tendons into a bridge body, wherein all the prestressed tendons penetrate through an anchor backing plate component of the tensioning device, pass through a working anchor component, a reverse pressing plate and a jack and penetrate out of the tool anchor component;
s22: the tool jacket of the tool anchor assembly locks all the prestressed tendons;
s23: the jack drives the stretching telescopic part to extend, and pulls all the prestressed tendons to move along the extending direction of the stretching telescopic part;
s24: driving a push-pull rod to drive a lifting connecting piece to lift a tool jacket, moving all tool clamping pieces of the tool jacket towards a tensioning direction relative to the prestressed tendons, and loosening the clamping operation of the tool jacket on the prestressed tendons;
s25: if the prestressed tendon is tensioned, the tensioning is finished; otherwise, the jack drives the stretch-draw expansion part to contract and then returns to the step S22.
In step S22, the specific contents of the tool collet of the tool anchor assembly locking all the tendons are as follows: rotate the push-pull rod, make the relative prestressing tendons of push-pull rod moves along the stretch-draw opposite direction, it is right to carry to draw the connecting piece and loosen the effect of carrying and drawing of instrument clamp cover, the clamping piece resets under the elastic action, and the relative prestressing tendons of all instrument clamping pieces that drive the instrument clamp cover moves along the stretch-draw opposite direction, and all instrument clamping pieces reduce and hold the through-hole, lock all prestressing tendons.
The method comprises the following steps of:
s31: the jack drives the jacking telescopic part to jack along the opposite direction of tensioning;
s32: the top pressure telescopic part drives a pressing boss of the reverse pressing plate to top pressure the working jacket;
s33: after the working jacket is subjected to the jacking action, the working anchor hole is reduced, and the working jacket finally clamps the prestressed reinforcing steel;
s34: and disassembling the reverse pressing plate, the jack and the tool anchor assembly.
The method for the controller to perform intelligent control on the tensioning construction specifically comprises the following steps:
s41: the controller obtains the total length value of the bridge body and the length value of the prestressed tendon which is currently penetrated into the bridge body;
s42: setting a relation between the total length value of the bridge body and the length value of the reserved prestressed tendon of the bridge body in the controller to obtain a length value to be tensioned; wherein the total length value L of the bridge body and the length value L of the reserved prestressed tendon can be in a proportional relation, namely: and L is k L, and the value range of the proportionality coefficient k is 1-1.1.
S43: the controller controls the jack to stretch the prestressed tendons;
s44: the controller acquires a current total tensioning length value in real time, and stops tensioning operation if the current total tensioning length value is greater than or equal to the length value to be tensioned; otherwise, the process returns to step S43.
In step S43, the specific content of the tensioning operation of the jack on the tendon controlled by the controller is as follows:
in the tensioning process, the controller controls an oil pump connected with the jack to work, the oil pump injects oil to the jack through an oil injection pipe and drives the tensioning expansion part to extend;
the controller acquires flow information detected by a flow sensor on the oil filling pipe, combines the flow information with a displacement signal of a first displacement sensor on the stretching and stretching part to obtain the stretching length of the current stretching and stretching part, and controls the jack to stop stretching if the stretching length of the stretching and stretching part reaches a jack stretching threshold value;
when the stretching and retracting part of the jack needs to be retracted, the controller controls the return valve on the oil return pipe to be opened, and the stretching and retracting part begins to retract.
In the tensioning control process, the controller acquires each prestressed tendon displacement sensor on the mobile monitoring assembly, the prestressed tendon displacement sensors detect the movement length of each prestressed tendon, and when the displacement lengths detected by any prestressed tendon displacement sensor are unequal, the controller is connected with an alarm on the controller to give an alarm.
The invention has the advantages that: firstly, the innovative design of the tool anchor ring can facilitate the penetration of a plurality of prestressed tendons; secondly, all work pieces are mutually matched to realize the clamping of the prestressed tendons, the stretching and retracting part of the bidirectional jack works firstly to stretch the prestressed tendons to a preset stress value, then the stretching and retracting part works to push the reverse pressing plate to push the working jacket, so that the working anchor clamps the prestressed tendons, the sliding of the prestressed tendons can be reduced, and compared with a traditional stretching system, the scheme can reduce the stress loss, avoid excessive stretching, better control the stretching process and improve the stretching effect. Thirdly, the method comprises the following steps: the automatic control is realized by combining with the controller, the failure rate in the tensioning process is reduced, and the tensioning reliability is improved. Fourthly, the method comprises the following steps: the tensioning device is orderly assembled and disassembled, the tensioning process is compact in steps, the controller monitors and controls in real time, and the intelligent and accurate tensioning device is achieved.
Drawings
FIG. 1 is a schematic view of the construction of a tensioning device according to the present invention;
FIG. 2 is a schematic view of the assembled structure of the tension device reverse compression plate and the working anchor assembly;
FIG. 3 is a schematic structural view of a working anchor assembly of the tensioning device;
FIG. 4 is a schematic structural view of a reverse pressing plate of the tensioning device;
FIG. 5 is a schematic view of the construction of the tensioning device tool anchor assembly;
FIG. 6 is an enlarged view of m in FIG. 5;
FIG. 7 is a control block diagram of the present invention;
FIG. 8 is a flow chart of the installation of the tensioning device of the present invention;
FIG. 9 is a flow chart of the construction of tensioning the prestressed tendons by the tensioning device according to the present invention;
FIG. 10 is a flow chart of the construction process of locking the prestressed tendons by the tensioning device according to the present invention;
FIG. 11 is a flow chart of the intelligent control of the controller for tensioning construction according to the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
An intelligent prestress tensioning automatic control method comprises the following steps: a step for installing a tensioning device;
the step of tensioning construction of the prestressed tendon by a tensioning device; a step for locking the prestressed tendons by a tensioning device; and a step of intelligent control for the controller f to perform tensioning construction.
As can be seen in fig. 1, in the present embodiment, the tensioning device includes an anchor backing plate assembly e, a working anchor assembly a, a counter pressing plate b, a jack c and a tool anchor assembly d; the anchor backing plate component e, the working anchor component a, the reverse pressing plate b, the jack c and the tool anchor component d are sequentially abutted and sleeved on all the prestressed tendons along the tensioning direction.
Jack c is two-way jack, and it includes cylinder body c3, is equipped with two pars contractilis on this cylinder body c3, two the flexible direction of pars contractilis is parallel to each other, two the pars contractilis forms stretch-draw pars contractilis and roof pressure pars contractilis respectively, install on the stretch-draw pars contractilis instrument anchor subassembly d, install on the roof pressure pars contractilis reverse pressure board b.
In this embodiment, anchor backing plate subassembly e is fixed in the concrete matrix, anchor backing plate subassembly e includes anchor backing plate e1, first spiral stirrup e2 and second spiral stirrup e4, anchor backing plate e1 includes anchor backing plate body e11 and trumpet pipe e12, anchor backing plate body e11 includes the bearing surface that sets up dorsad and supports the face, anchor backing plate body e11 center is provided with the prestressing tendons through-hole, surround on anchor backing plate body e 11's the bearing surface prestressing tendons through-hole is equipped with round anchor ring bayonet e6, work anchor ring a1 falls in the anchor ring bayonet e 6. The big head end of the flared tube e12 is connected to the abutting surface of the anchor backing plate body e11, and the flared tube e12 and the anchor backing plate body e11 are integrally formed for use. The outer concentric cover of horn tube e12 is equipped with first spiral stirrup e2, the ring is to the ring direction and is provided with flange e3 on the microcephaly end outer wall of horn tube e12, flange e3 one side is provided with second spiral stirrup e4, this second spiral stirrup e4 is located flange e3 is kept away from tie plate body e11 one side, first spiral stirrup e2 and second spiral stirrup e 4's the opposite direction of rotation, first spiral stirrup e2 is close to the one end of tie plate body e11 is connected with this tie plate body e11 spot welding, the second spiral stirrup e4 is close to the one end of flange e3 is connected with this flange e3 spot welding. Compared with a traditional assembly, the design of the anchor backing plate assembly e in the scheme can enhance the holding force of the concrete base body below the anchor backing plate, and the concrete strength of the stress concentration area is improved, so that powerful support is provided for tensioning the prestressed tendons.
As shown in fig. 2 and 3, the working anchor assembly a abuts against the bearing surface of the anchor backing plate body e11, the working anchor assembly a comprises a working anchor ring a1 and a working collet a2, a working anchor hole a4 is formed in the working anchor ring a1 in a penetrating manner, and the working collet a2 is matched with the working anchor hole a 4;
the working anchor ring a1 comprises a backing plate surface and a pressure bearing surface, the backing plate surface abuts against the anchor backing plate assembly e, the pressure bearing surface faces the reverse pressing plate b, the working clamping sleeve a2 is inserted into the working anchor hole a4 from the pressure bearing surface, and the jacking expansion part pushes the reverse pressing plate b to jack the working clamping sleeve a 2;
and the reverse compression plate b is matched with the working anchor assembly a. As shown in fig. 4, the reverse pressing plate b comprises a pressing plate body b1, the pressing plate body b1 comprises a mounting surface and a pressing surface which are arranged oppositely, the mounting surface faces the inside of the cylinder c3, the pressing surface is provided with a pressing boss b2, the center of the pressing boss b2 is provided with a tendon through hole b3, and two ends of the tendon through hole b3 are respectively opened on the end surface of the pressing boss b2 and the mounting surface;
a pressing butt joint blind hole a3 corresponding to the pressing boss b2 is formed in the pressure bearing surface of the working anchor ring a1, the working anchor hole a4 penetrates through the bottom of the pressing butt joint blind hole a3, the working anchor hole a4 is in a circular truncated cone shape, one end, with the larger inner diameter, of the working anchor hole a4 is opened in the pressing butt joint blind hole a3, and one end, with the smaller inner diameter, of the working anchor hole a4 is opened on the pad surface;
the outer wall of the working jacket a2 is in a truncated cone shape adapted to the inner wall of the working anchor hole a4, a prestressed tendon anchor hole is formed in the center of the working jacket a2, the working jacket a2 is formed by annularly assembling at least two working clamping pieces, the diameter of the large end of the working jacket a2 is larger than the maximum inner diameter of the working anchor hole a4 and smaller than the inner diameter of the compression butt joint blind hole a3, the large end of the working jacket a2 extends out of the working anchor hole a4 and then falls into the compression butt joint blind hole a3, and the compression boss b2 presses the large end face of the working jacket a 2.
In order to facilitate the matching between the reverse compression plate b and the working anchor ring a1, a positioning mechanism is arranged between the reverse compression plate b and the working anchor ring a1, the positioning mechanism comprises an anchor ring positioning rod b4 arranged on the compression plate body b1 and a positioning hole a5 arranged on the working anchor ring a1, the anchor ring positioning rod b4 is vertically arranged on the pressure-applying surface of the compression plate body b1, the positioning hole a5 is arranged on the pressure-bearing surface of the working anchor ring a1, the positioning hole a5 is a blind hole, and the anchor ring positioning rod b4 is matched with the positioning hole a 5. The design enables the anchor ring positioning rod to guide the reverse pressing plate to stably approach and press the working clamping piece.
The stretching and pressing functions of the bidirectional jack are realized as follows: run through on two-way jack's the cylinder body c3 and be equipped with the prestressed tendon via hole, correspond on two pars contractilis the prestressed tendon via hole is equipped with prestressed tendon centre gripping hole respectively, is located in stretch-draw pars contractilis last the prestressed tendon centre gripping hole forms anchor ring fixed orifices c1, instrument anchor subassembly d is installed in this anchor ring fixed orifices c1, is located on the roof pressure pars contractilis prestressed tendon centre gripping hole forms pressure strip fixed orifices c2, reverse pressure strip b installs in this pressure strip fixed orifices c 2.
Cylinder body c3 includes outer sleeve c5 and inner skleeve c6 that the coaxial line cover was established, inner skleeve c 6's internal cavity forms prestressing tendons via hole, form cylindric grease chamber between outer sleeve c5 and the inner skleeve c6, the middle part of this grease chamber is equipped with grease chamber spacer ring c3a, this grease chamber spacer ring c3a respectively with inner skleeve c 6's outer wall and outer sleeve c 5's inner wall fixed connection, this grease chamber spacer ring 3a will the grease chamber is separated for two piston chamber c4, two the both ends from the grease chamber are stretched into respectively in two piston chamber c4 to the pars contractilis flexible, seal between the both ends of grease chamber and the corresponding pars contractilis, every be equipped with oiling mouth and oil return nozzle on the outer sleeve c5 that piston chamber c4 corresponds respectively.
The telescopic part comprises an annular piston c7 and a telescopic cylinder c8, wherein the annular piston c7 is annularly arranged in a piston cavity c4, the inner end of the telescopic cylinder c8 extends into the piston cavity c4 along the central line direction of the cylinder c3 and is connected with the annular piston c7, a sealing element is arranged between the telescopic cylinder c8 and the outer sleeve c5 and the inner sleeve c6, the oil nozzle and the oil return nozzle are respectively positioned on two sides of the annular piston c7, and the inner cavity of the telescopic cylinder c8 forms the prestressed tendon clamping hole.
As shown in fig. 5, a tool anchor assembly d is used for clamping the prestressed tendon, and comprises a tool anchor ring d1 and a tool collet d 2; the tool anchor ring d1 comprises a working surface and a mounting surface, a tool anchor hole d3 penetrates through the tool anchor ring d1, the tool anchor hole d3 is in a circular truncated cone shape, one end of the tool anchor hole d3 with the larger inner diameter is opened on the working surface, and one end of the tool anchor hole d3 with the smaller inner diameter is opened on the mounting surface;
the tool clamping sleeve d2 is in a circular truncated cone shape which is matched with the inner wall of the tool anchoring hole d3, the tool clamping sleeve d2 is arranged in the tool anchoring hole d3, and a prestressed rib engaging hole which is the same with the hole center line of the tool anchoring hole d3 is arranged in the tool clamping sleeve d2 in a penetrating mode.
In the embodiment, the tool anchor assembly d is designed to be convenient to wear. Specifically, the tool jacket d2 is formed by annularly assembling at least two tool clamping pieces, the big end of the tool jacket d2 is connected with a clamping piece lifting assembly, the small end of the tool jacket d2 is connected with a clamping piece resetting piece d5, and a lifting operation piece is arranged between the clamping piece lifting assembly and the tool anchor ring d 1.
As shown in fig. 6, the inner wall of the tool anchor hole d3 is provided with clip guiding sliding grooves d4 along the direction of the generatrix of the circular truncated cone thereof, the clip guiding sliding grooves d4 are in one-to-one correspondence with the tool clips, the opening of the clip guiding sliding groove d4 is retracted, the clip guiding sliding grooves d4 are respectively provided with sliding guiding pieces d41 therein, and the sliding guiding pieces d41 are connected with the corresponding tool clips;
specifically, the piece d5 that resets is the elasticity piece that resets, the instrument clamping piece is connected with respectively the piece that resets of elasticity, and this elasticity resets and is in along its length direction setting in the clamping piece direction spout d4, the one end that the piece that resets with the inner wall of clamping piece direction spout d4 links to each other, the other end that the piece that resets of elasticity with the instrument clamping piece links to each other, the piece that resets with the link of clamping piece direction spout d4 inner wall is close to the installation face, the link that the piece that resets and the instrument clamping piece of elasticity is kept away from the installation face.
With the pulling of instrument clamping piece to the big head end direction of instrument anchor eye d3, under the guide of sliding guide d41, each instrument clamping piece slides along round platform generating line direction, helps keeping the gliding stability of instrument clamping piece, avoids interference and dislocation between a plurality of clamping pieces to enlarge prestressing tendons interlock hole, conveniently wear to establish prestressing tendons, after finishing using, the clamping piece that resets d5 can help the instrument clamping piece to reply in the instrument anchor eye d 3.
In order to facilitate pulling of the tool clamping piece, the clamping piece pulling assembly comprises a clamping piece pulling plate d6 and a pulling connecting piece d7, wherein the clamping piece pulling plate d6 is located on one side of a working face of the tool anchor ring d1, a prestressed tendon through hole d8 corresponding to the tool anchor hole d3 is arranged on the clamping piece pulling plate d6, the tool clamping piece is respectively connected with the pulling connecting piece d7, two ends of the pulling connecting piece d7 are respectively connected with the tool clamping piece and the clamping piece pulling plate d6, and the pulling connecting piece d7 is also arranged in the clamping piece guiding sliding groove d4, so that the space in the tool anchor hole d3 is prevented from being occupied.
Specifically, the pull-up connector d7 and the clip returning connector d5 may be springs.
For convenient operation, the lifting operation piece comprises a push-pull rod d9, the push-pull rod d9 is perpendicular to the clamping piece lifting plate d6, one end of the push-pull rod d9 is in threaded connection with the tool anchor ring d1, the other end of the push-pull rod d9 movably penetrates through the clamping piece lifting plate d6, an expansion part d10 is arranged in the middle of the push-pull rod d9, the expansion part d10 is located between the clamping piece lifting plate d6 and the tool anchor ring d1, and an abdicating notch d11 corresponding to the expansion part d10 is arranged on the working surface.
As shown in fig. 1, in order to facilitate the assembly between the tool anchor assembly and the tensioning and stretching portion of the jack, the reverse pressing plate and the jacking and stretching portion of the jack, and the jack and the working anchor ring, the present embodiment has the following design:
an installation clamping ring c10 is arranged in the prestressed tendon clamping hole close to the outer end of the telescopic cylinder c8, the center line of the installation clamping ring c10 is overlapped with the center line of the telescopic cylinder c8, and the outer end face of the installation clamping ring c10 is provided with an abutting chamfer;
the assembling surface of the pressing plate body b1 abuts against the outer end surface of a mounting snap ring c10 on a telescopic cylinder c8 of the jacking telescopic part, and the edge of the assembling surface of the pressing plate body b1 is provided with an annular assembling chamfer b5 matched with the abutting chamfer;
the mounting surface of the tool anchor ring d1 abuts against the outer end surface of a mounting clamping ring c10 on a telescopic cylinder c8 of the tensioning telescopic part, and the edge of the mounting surface of the tool anchor ring d1 is provided with an annular mounting chamfer matched with the abutting chamfer;
at least one pair of positioning magnets is arranged between the telescopic cylinder c8 of the jacking telescopic part and the pressing plate body b1, and at least one pair of positioning magnets is also arranged between the telescopic cylinder c8 of the tensioning telescopic part and the tool anchor ring d 1;
the positioning magnet pair comprises a main positioning magnet c11 and a secondary positioning magnet, and the main positioning magnet is respectively arranged on the chamfer inclined plane of the mounting snap ring c10 abutting against the chamfer; the slave positioning magnet comprises a pressure plate slave positioning magnet b6 and an anchor ring slave positioning magnet d12, wherein the pressure plate slave positioning magnet b6 is arranged in an annular assembling chamfer b5 of the pressure plate body b1, and the anchor ring slave positioning magnet d12 is arranged in an annular installing chamfer of the tool anchor ring d 1;
a supporting cylinder c9 is arranged on the cylinder c3 on the same center line, the outer edge of the outer sleeve c5 on one side of the jacking and stretching part is connected with the inner edge of the supporting cylinder c9, an outward flange is arranged on the outer edge of the supporting cylinder c9, an annular groove a6 matched with the flange is arranged on the pressure bearing surface of the working anchor ring a1, and the annular groove a6 is surrounded outside the compression and butt joint blind hole a 3;
and the end parts of the extending ends of the pressing boss b2 and the anchor ring positioning rod b4 are provided with outer chamfers.
Because a plurality of prestressed tendons are required to be used by one prestressed beam in engineering practice, the working anchor assembly a and the tool anchor assembly d are both porous anchorages, and the reverse pressing plate b is correspondingly provided with a plurality of pressing bosses b2 and prestressed tendon through holes b 3.
As shown in fig. 1, a prestress tensioning system is installed, the tensioning expansion part of the bidirectional jack c works to start tensioning, and after a preset tensioning amount is reached, the jacking expansion part of the jack pushes the reverse pressing plate b to jack the working jacket a2, so that the working anchor assembly a clamps the prestressed tendons, the prestressed tendons are prevented from rebounding, and the prestressed loss is reduced.
As can be seen from fig. 1 and 7, the telescopic lengths of the two telescopic parts of the jack c are controlled by the controller f;
wherein, a first displacement sensor f1 is arranged on the stretching telescopic part, and the first displacement sensor f1 is connected with a first displacement input end of the controller f;
the jacking and telescoping part is provided with a second displacement sensor f2, and the second displacement sensor f2 is connected with a second displacement input end of the controller f.
The oil inlet ends of the two oil filling pipes are respectively connected with two oil pumps f3, and the two oil pumps f3 pump oil in an oil drum; the oil outlet ends of the two oil return pipes extend into the oil drum, and the two oil pumps f3 are connected with the two jacking control ends of the controller f;
two oil filling pipes are provided with oil flow sensors: a first oil flow sensor f41 and a second oil flow sensor f42, wherein the first oil flow sensor f41 and the second oil flow sensor f42 are respectively connected with two flow signal input ends of the controller f.
In this embodiment, in order to improve tensioning accuracy, still be provided with and remove monitoring components g, this removal monitoring components g is fixed to be set up on the stretch-draw extension line of instrument anchor subassembly d, removal monitoring components g includes at least one prestressing tendons via hole, all is provided with prestressing tendons displacement sensor g1 in every prestressing tendons via hole, all prestressing tendons displacement sensor g1 all with controller f connects.
As can be seen from fig. 8, the steps for installing the tensioning device are specifically:
s11: fixing an anchor backing plate component e of the tensioning device at the end part of the bridge body;
the anchor backing plate assembly e comprises an anchor backing plate e1, and a first spiral stirrup e2 and a second spiral stirrup e4 which are arranged on the anchor backing plate e1, wherein the anchor backing plate e1 is sleeved on the end part of the bridge body, and the backing plate assembly e is fixed on the end part of the bridge body through the first spiral stirrup e2 and the second spiral stirrup e 4;
s12: installing a working anchor assembly a;
abutting the working anchor ring a1 backing plate surface of the working anchor assembly a against the anchor ring bayonet e6 of the anchor backing plate body e11 bearing surface; a working anchor hole a4 is formed in the working anchor ring a1 in a penetrating mode, and the working jacket a2 is arranged in the working anchor hole a 4;
s13: installing a reverse compression plate b and a jack c;
pressing a pressing boss b2 of the reverse pressing plate b correspondingly to a butt-joint blind hole a3 on a pressure bearing surface of the working anchor ring a1, wherein a top pressing telescopic part of the jack c abuts against an assembling surface of the reverse pressing plate b;
s14: installing a tool anchor assembly d;
fixing the tool anchor assembly d on the tensioning expansion part of the jack c, arranging a tool clamping sleeve d2 of the tool anchor assembly d in a tool anchoring hole d3 of a tool anchoring ring d1 of the tool anchor assembly d, connecting a small head end of the tool clamping sleeve d2 with a tool anchoring ring d1 through a clamping piece resetting piece d5, connecting a large head end of the tool clamping sleeve d2 with a clamping piece pulling plate d6 of the tool anchor assembly d through a pulling connecting piece d7, and connecting a push-pull rod d9 between the clamping piece pulling plate d6 and the tool clamping sleeve d 2.
With reference to fig. 9, the steps for the tensioning device to perform tensioning construction on the prestressed tendons specifically include:
s21: penetrating prestressed tendons into the bridge body, wherein all the prestressed tendons penetrate through an anchor backing plate component e of the tensioning device, pass through a working anchor component a, a reverse pressing plate b and a jack c, and penetrate out of a tool anchor component d;
s22: the tool clamping sleeve d2 of the tool anchor assembly d locks all the prestressed tendons;
s23: the jack c drives the stretching and retracting part to extend, and pulls all the prestressed tendons to move along the extending direction of the stretching and retracting part;
s24: driving a push-pull rod d9 to drive a lifting connecting piece d7 to lift a tool clamping sleeve d2, wherein all tool clamping pieces of the tool clamping sleeve d2 move towards a tensioning direction relative to the prestressed tendons, and the tool clamping sleeve d2 is loosened to clamp the prestressed tendons;
s25: if the prestressed tendon is tensioned, the tensioning is finished; otherwise, the jack c drives the stretch-draw expansion part to contract and then returns to the step S22.
In this embodiment, the specific contents of the tool collet d2 of the tool anchor assembly d locking all the tendons in step S22 are as follows: the push-pull rod d9 is rotated to enable the push-pull rod d9 to move in the opposite tensioning direction relative to the prestressed tendons, the lifting connecting piece d7 loosens the lifting acting force on the tool jacket d2, the clamping piece resetting piece d5 drives all tool clamping pieces of the tool jacket d2 to move in the opposite tensioning direction relative to the prestressed tendons under the action of elastic force, and all the tool clamping pieces shrink the clamping through holes to lock all the prestressed tendons.
With reference to fig. 10, the steps for the tensioning device to lock the prestressed tendons specifically include:
s31: the jack c drives the jacking telescopic part to jack along the opposite tensioning direction;
s32: the jacking expansion part drives a compaction boss b2 of the reverse compaction plate b to jack the working jacket a 2;
s33: after the working jacket a2 is pressed, the working anchor hole a4 is reduced, and the working jacket a2 finally clamps the prestressed tendon;
s34: and (5) disassembling the reverse compaction plate b, the jack c and the tool anchor assembly d.
As can be seen from fig. 11, the steps for the controller f to perform intelligent control of tensioning construction specifically include:
s41: the controller f obtains the total length value of the bridge body and the length value of the prestressed tendon which is currently penetrated into the bridge body;
s42: a relation between the total length value of the bridge body and the length value of the reserved prestressed tendon of the bridge body is set in the controller f to obtain a length value to be tensioned;
s43: the controller f controls the jack c to stretch the prestressed tendon;
s44: and the controller f acquires the current total tensioning length value in real time, and stops the tensioning operation if the current total tensioning length value is greater than or equal to the length value to be tensioned.
In this embodiment, in step S43, the specific content of the control of the controller f to control the jack c to perform the tensioning operation on the tendon is as follows: in the tensioning process, the controller f controls an oil pump f3 connected with the jack c to work, the oil pump f3 injects oil to the jack c through an oil injection pipe, and the tensioning expansion part is driven to extend;
the controller f obtains flow information detected by a flow sensor on the oil filling pipe, combines the flow information with a displacement signal of a first displacement sensor on the stretching and stretching part to obtain the stretching length of the current stretching and stretching part, and controls the jack c to stop stretching if the stretching length of the stretching and stretching part reaches the stretching threshold value of the jack c;
when the stretching and retracting part of the jack c needs to be retracted, the controller f controls the return valve on the oil return pipe to be opened, and the stretching and retracting part begins to retract.
Preferably, in the tensioning control process, the controller f acquires the moving length of each prestressed tendon detected by all the prestressed tendon displacement sensors g1 on the moving monitoring assembly g, and when the displacement lengths detected by any one of the prestressed tendon displacement sensors g1 are unequal, the alarm f5 connected to the controller f gives an alarm. Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (7)
1. An intelligent prestress tensioning automatic control method is characterized by comprising the following steps:
a step for installing a tensioning device;
the tensioning device comprises an anchor backing plate component (e), a working anchor component (a), a reverse pressing plate (b), a jack (c) and a tool anchor component (d);
the step of tensioning construction of the prestressed tendon by a tensioning device;
a step for locking the prestressed tendons by a tensioning device;
a step for the controller (f) to perform intelligent control of the tensioning construction;
the steps for installing the tensioning device are as follows:
s11: fixing an anchor backing plate component (e) of a tensioning device at the end part of a bridge body;
the anchor backing plate component (e) comprises an anchor backing plate (e1) and a first spiral stirrup (e2) and a second spiral stirrup (e4) which are arranged on the anchor backing plate (e1), the anchor backing plate (e1) is sleeved at the end part of the bridge body, and the anchor backing plate component (e) is fixed at the end part of the bridge body through the first spiral stirrup (e2) and the second spiral stirrup (e 4);
s12: installing a work anchor assembly (a);
abutting a working anchor ring (a1) backing plate surface of the working anchor assembly (a) in an anchor ring bayonet (e6) of the bearing surface of the anchor backing plate body (e 11); a working anchor hole (a4) is formed in the working anchor ring (a1) in a penetrating mode, and a working jacket (a2) is arranged in the working anchor hole (a 4);
s13: installing a reverse compaction plate (b) and a jack (c);
pressing a pressing boss (b2) of the reverse pressing plate (b) correspondingly to a butt joint blind hole (a3) on a pressure bearing surface of the working anchor ring (a1), wherein a top pressure telescopic part of the jack (c) abuts against an assembly surface of the reverse pressing plate (b);
s14: installing a tool anchor assembly (d);
fixing the tool anchor assembly (d) on the tensioning expansion part of the jack (c), wherein a tool jacket (d2) of the tool anchor assembly (d) is arranged in a tool anchor hole (d3) of a tool anchor ring (d1) of the tool anchor assembly (d), the small head end of the tool jacket (d2) is connected with a tool anchor ring (d1) through a clamping piece resetting piece (d5), the large head end of the tool jacket (d2) is connected with a clamping piece pulling plate (d6) of the tool anchor assembly (d) through a pulling connecting piece (d7), and a push-pull rod (d9) is connected between the clamping piece pulling plate (d6) and the tool jacket (d 2).
2. The intelligent prestress tensioning automatic control method according to claim 1, wherein the step of performing tensioning construction on the prestressed tendon by the tensioning device is specifically as follows:
s21: penetrating prestressed tendons into the bridge body, wherein all the prestressed tendons penetrate through an anchor backing plate component (e) of the tensioning device, pass through a working anchor component (a), a reverse compaction plate (b) and a jack (c), and penetrate out of a tool anchor component (d);
s22: the tool clamping sleeve (d2) of the tool anchor assembly (d) locks all the prestressed tendons;
s23: the jack (c) drives the stretching and retracting part to extend and operate, and pulls all the prestressed tendons to move along the extension direction of the stretching and retracting part;
s24: driving a push-pull rod (d9) to drive a lifting connecting piece (d7) to lift a tool jacket (d2), moving all tool clamping pieces of the tool jacket (d2) relative to the prestressed tendon in a tensioning direction, and loosening the clamping operation of the tool jacket (d2) on the prestressed tendon;
s25: if the prestressed tendon is tensioned, the tensioning is finished; otherwise, the jack (c) drives the stretch-draw expansion and contraction operation and returns to the step S22.
3. The intelligent prestress tensioning automatic control method according to claim 2, wherein in step S22, the tool collet (d2) of the tool anchor assembly (d) locks all the tendons as follows: the push-pull rod (d9) is rotated to enable the push-pull rod (d9) to move along the opposite tensioning direction relative to the prestressed tendons, the lifting connection piece (d7) releases the lifting action force on the tool jacket (d2), the clamping piece resetting piece (d5) drives all tool clamping pieces of the tool jacket (d2) to move along the opposite tensioning direction relative to the prestressed tendons under the action of elasticity, all the tool clamping pieces shrink the clamping through holes, and all the prestressed tendons are locked.
4. The intelligent prestress tensioning automatic control method according to claim 2, wherein the step of locking the prestressed tendon by the tensioning device is specifically:
s31: the jack (c) drives the jacking telescopic part to jack along the opposite direction of tensioning;
s32: the jacking telescopic part drives a compaction boss (b2) of the reverse compaction plate (b) to jack the working jacket (a 2);
s33: after the working clamping sleeve (a2) is pressed, the working anchor hole (a4) is reduced, and the working clamping sleeve (a2) finally clamps the prestressed tendon;
s34: and (d) disassembling the reverse compaction plate (b), the jack (c) and the tool anchor assembly (d).
5. The automatic control method for intelligent prestress tensioning according to claim 4, wherein the step for the controller (f) to perform intelligent control for tensioning construction specifically comprises:
s41: the controller (f) acquires the total length value of the bridge body and the length value of the prestressed tendon which is currently penetrated into the bridge body;
s42: a relation between the total length value of the bridge body and the length value of the reserved prestressed tendon of the bridge body is set in the controller (f) to obtain a length value to be tensioned;
s43: the controller (f) controls the jack (c) to stretch the prestressed tendon;
s44: the controller (f) acquires a current tensioning total length value in real time, and stops tensioning operation if the current tensioning total length value is larger than or equal to the length value to be tensioned; otherwise, the process returns to step S43.
6. The intelligent prestress tensioning automatic control method according to claim 5, wherein in the step S43, the controller (f) controls the jack (c) to perform tensioning operation on the prestressed tendon, specifically comprising the following steps:
in the tensioning process, the controller (f) controls an oil pump (f3) connected with the jack (c) to work, the oil pump (f3) injects oil to the jack (c) through an oil injection pipe to drive the tensioning expansion part to extend;
the controller (f) acquires flow information detected by a flow sensor on the oil filling pipe, combines the flow information with a displacement signal of a first displacement sensor on the stretching and stretching part to obtain the stretching length of the current stretching and stretching part, and controls the jack (c) to stop stretching if the stretching length of the stretching and stretching part reaches the stretching threshold value of the jack (c);
when the stretching and retracting part of the jack (c) needs to be retracted, the controller (f) controls the return valve on the oil return pipe to be opened, and the stretching and retracting part begins to retract.
7. The intelligent prestress tensioning automatic control method according to claim 5, characterized in that in the tensioning control process, the controller (f) acquires the moving length of each prestress rib detected by all prestress rib displacement sensors (g1) on the moving monitoring assembly (g), and when the displacement lengths detected by any one prestress rib displacement sensor (g1) are unequal, an alarm (f5) connected to the controller (f) gives an alarm.
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| CN2018101036704 | 2018-02-01 | ||
| CN201810103670 | 2018-02-01 |
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| CN115262981B (en) * | 2022-08-16 | 2023-05-02 | 中铁十五局集团有限公司 | Intelligent prestress tensioning construction device for building engineering |
| CN116255013B (en) * | 2022-11-25 | 2024-10-29 | 中国建筑第二工程局有限公司 | Prestress tensioning jack |
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| CN102359231A (en) * | 2011-08-05 | 2012-02-22 | 建研科技股份有限公司 | Heat treatment high-yield-ratio steel bar pre-tensioning clamp and using method thereof |
| CN103967008A (en) * | 2014-04-04 | 2014-08-06 | 山东正元建设工程有限责任公司 | Clip type pre-stress anchor cable active clip feeding and tension locking device and use method |
| CN105675198A (en) * | 2016-04-05 | 2016-06-15 | 中国京冶工程技术有限公司 | Unbounded prestressing tendon tendon-cut rear end prestressing force detection device and detection method |
| CN106758820A (en) * | 2016-11-15 | 2017-05-31 | 中铁二局集团有限公司 | A kind of continuous Cast-in-situ Beam prestressing tendon stretch-draw construction method of minor radius |
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2018
- 2018-05-14 CN CN201810454743.4A patent/CN108612313B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102359231A (en) * | 2011-08-05 | 2012-02-22 | 建研科技股份有限公司 | Heat treatment high-yield-ratio steel bar pre-tensioning clamp and using method thereof |
| CN103967008A (en) * | 2014-04-04 | 2014-08-06 | 山东正元建设工程有限责任公司 | Clip type pre-stress anchor cable active clip feeding and tension locking device and use method |
| CN105675198A (en) * | 2016-04-05 | 2016-06-15 | 中国京冶工程技术有限公司 | Unbounded prestressing tendon tendon-cut rear end prestressing force detection device and detection method |
| CN106758820A (en) * | 2016-11-15 | 2017-05-31 | 中铁二局集团有限公司 | A kind of continuous Cast-in-situ Beam prestressing tendon stretch-draw construction method of minor radius |
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