CN113276271B - Pretensioned prestressed concrete production facility and operation method - Google Patents
Pretensioned prestressed concrete production facility and operation method Download PDFInfo
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- CN113276271B CN113276271B CN202110432222.0A CN202110432222A CN113276271B CN 113276271 B CN113276271 B CN 113276271B CN 202110432222 A CN202110432222 A CN 202110432222A CN 113276271 B CN113276271 B CN 113276271B
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- steel wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
Abstract
The invention discloses a pre-tensioning prestressed concrete production facility which comprises a bearing system, a releasing and tensioning system and a steel strand, wherein a steel plate bracket is pre-embedded in the bearing system and used for bearing one end of the steel strand, and the releasing and tensioning system is used for releasing and tensioning the steel strand in a mode that a pulley block is connected with the other end of the steel strand. The invention also discloses an operation method of the pretensioned prestressed concrete production facility. The invention adopts the pedestal mode of pre-embedding the steel corbels and the pulley block tension releasing mode, thereby not only having high construction efficiency and saving a large amount of engineering machinery and engineering materials, but also completing the relaxation of prestressed tendons and having safe and rapid operation.
Description
Technical Field
The invention relates to the technical field of prestressed concrete construction. More particularly, the present invention relates to pretensioned prestressed concrete production facilities and methods of operation.
Background
The prefabricate field of the prestressed concrete component of the pretensioning method generally adopts the mode of pressing the column or setting up the reinforced concrete corbel on the pistol handle type pedestal to bear the tensile force, generally set up two girder steels in the tensile end, the non-tensile end sets up a girder steel, need to use facilities such as sandbox, wedge block to put and open when relaxing, because the girder steel is many and the specification is big, the phenomenon of wasting the prestressed steel strand is more serious, and the tensioning equipment is large-scale jack, the equipment, the apparatus expense is high, and can not put in place completely when putting and opening, the prestressed reinforcement still has the stress of a certain degree, the prestressed reinforcement rebounds during cutting, not only can cause the adverse effect to the component, can threaten constructor's safety.
Disclosure of Invention
The invention aims to provide a pretensioned prestressed concrete production facility and an operation method, which adopt a pedestal mode of pre-embedded steel corbels and a pulley block releasing and tensioning mode, have high construction efficiency, save a large amount of engineering machinery and engineering materials, can release prestressed tendons, and are safe and quick to operate.
To achieve these objects and other advantages in accordance with the present invention, there is provided a pretensioned prestressed concrete production facility, including a bearing system, a releasing and tensioning system, and a steel strand, wherein a steel plate bracket is embedded in the bearing system for bearing force on one end of the steel strand, and the releasing and tensioning system releases and tensions the steel strand by connecting the other end of the steel strand through a pulley block.
Preferably, the bearing system includes a pair of pedestal, concrete terrace, steel sheet bracket and steel backing plate, and a pair of pedestal sets up relatively and is connected to the both sides of concrete terrace respectively, the steel sheet bracket is buried in advance on the pedestal and is set up the polylith along the width direction interval of pedestal, and the setting that is located the polylith steel sheet bracket of tensioning end satisfies exactly the steel strand wires one-to-one staggers to pass between the adjacent steel sheet bracket, and the outside welding of the steel sheet bracket that is located the tensioning end has the steel backing plate, is provided with a plurality of round holes on it, one pair of one end of steel strand wires just should pass in a plurality of round holes and pass through telescopic ground tackle in the steel backing plate outside and fix.
Preferably, the pedestal is pistol handle formula pedestal, and the handle of a pair of pedestal sets up relatively, it has the bracket anchor muscle still to weld on the steel sheet bracket, and it is located the pedestal.
Preferably, put a system and include stretch-draw girder steel, wire rope, running block, crown block, wire rope clamp and punching jack, the other end anchor of steel strand wires is in the inboard of stretch-draw girder steel, and the running block sets up on the stretch-draw girder steel, and the crown block sets up on putting the steel sheet bracket of opening the end, cross winding is again in proper order on a plurality of pulleys of running block and crown block after wire rope one end is fixed, the other end after the wire rope winding is connected to on the punching jack, the punching jack is fixed in on the pedestal of corresponding end, the wire rope clamp is used for carrying out the centre gripping to wire rope fixedly.
Preferably, the stretch-draw girder steel is formed by web, a pair of flange board, a pair of bedplate and stiffener welding, web and a pair of flange board are connected for the U type structure of opening outside towards, and a pair of bedplate is fixed in just the symmetry is located between a pair of flange board on the web, is provided with the polylith stiffener between a pair of bedplate, also be provided with the through-hole that a plurality of confession steel strand wires passed on the web, the steel strand wires pass through telescopic ground tackle anchor in inside the stretch-draw girder steel, the running block sets up between bedplate and flange board.
Preferably, one end of the steel wire rope is fixed on the outer side of the tension steel beam or the steel plate bracket at the tension end after being locked by a compression sleeve fixed on the tension steel beam.
Preferably, a bearing frame is fixed on the outer side of the steel plate bracket at the releasing end, the steel wire rope penetrates through the bearing frame and then penetrates through the feed-through jack, the steel wire rope is finally locked through the steel wire rope clamp, and the upper portion of the jack is fixed on the pedestal through a fixing hoop.
Preferably, the movable pulley block and the fixed pulley block are in a pair, the movable pulley block is arranged between the upper flange plate and the lower flange plate and the support plate respectively, the fixed pulley blocks are arranged on the steel plate bracket at intervals vertically, and the steel wire ropes are also arranged in two numbers and penetrate out of the center-penetrating jack after being wound up and down respectively.
The invention also provides an operation method of the pretensioned prestressed concrete production facility, which comprises the following steps:
s1: blanking the steel strand according to the length of the prefabrication production line, wherein the end part of the steel strand sequentially penetrates through a web plate through hole of the tension steel beam, is positioned in the tension steel beam and is anchored through a sleeve anchorage device;
s2: fixing one end of a steel wire rope, and then sequentially and crossly penetrating through a movable pulley block and a fixed pulley block to enable the movable pulley block and the fixed pulley block to be close to each other, penetrating the other end of the steel wire rope through a force bearing frame and then penetrating through a center-penetrating jack, and tensioning the steel wire rope by the center-penetrating jack to enable the steel wire rope to have certain tension;
s3: after the other end of the steel strand sequentially passes through the through holes on the steel backing plate, the other end of the steel strand is symmetrically tensioned through a tensioning jack arranged at the tensioning end, and the tensioned steel strand is anchored on the steel backing plate by using a sleeve anchorage device;
s4: binding component steel bars, erecting a template and pouring concrete;
s5: after the strength of the concrete member reaches the design requirement, releasing and tensioning the stress of the steel strand through a releasing and tensioning system;
s6: and cutting off the steel strands among the concrete pattern members by using a cutting device.
Preferably, the step S5 specifically includes the following steps:
s51: returning oil to the penetrating jack to release and stretch the steel wire rope and further release and stretch the steel strand;
s52: when the cross-core jack only has about 5 percent of travel, the steel wire rope is clamped in the bearing frame to clamp the steel wire rope, and oil return is continued to ensure that the steel wire rope in the bearing frame is tightly clamped on a side plate of the bearing frame;
s53: then the steel wire rope clamp at the telescopic end of the feed-through jack is disassembled, and at the moment, the feed-through jack takes oil, and the ejector rod is ejected by about 90 percent;
s54: then clamping the steel wire rope by the steel wire rope clamp at the telescopic end of the feed-through jack, continuously feeding oil to separate the steel wire rope clamp in the bearing frame from the bearing frame side plate and disassemble the steel wire rope clamp in the bearing frame, and returning oil by the feed-through jack;
s55: and (5) circularly operating in the above way, and repeating the steps until the steel wire rope is completely loosened.
The invention at least comprises the following beneficial effects:
1. the invention adopts the pedestal mode of pre-embedding the steel corbels and the pulley block tension releasing mode, thereby not only having high construction efficiency and saving a large amount of engineering machinery and engineering materials, but also completing the relaxation of prestressed tendons and having safe and rapid operation. The popularization of the technology brings bright prospect to the construction of the pre-tensioned prestressing force.
2. The core technology of the invention is the organic combination of a pulley block and a multipoint fixed support (steel plate bracket), a large-stroke straight-through jack is used for releasing a steel wire rope, the stress of the fixed support is balanced under the action of the pulley block, a channel-shaped steel beam is adopted at the side of a movable pulley, and the movable pulley and an anchorage device of a prestressed tendon form an organic whole convenient to control. The safety can be ensured by using the feed-through jack for releasing and expanding, and the releasing and expanding system has large releasing and expanding size and is quicker, completely and thoroughly than the releasing and expanding of the wedge-shaped block and the releasing and expanding of the sand box.
3. Compared with a sandbox and other tension releasing modes, the tension releasing system can effectively reduce the waste of the steel strands.
4. Conventional pretensioning precast field tensioning equipment is large-scale jack, and equipment, utensil expense are high, and the technical scheme who adopts this application only needs the punch-through jack of less specification can realize putting safely and open.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a top view of the overall structure of the present invention;
FIG. 2 is a side view of the overall structure of the present invention;
fig. 3 is an enlarged structural top view of the force bearing system of the invention;
fig. 4 is an enlarged structural side view of the force bearing system of the invention;
FIG. 5 is an enlarged top view of the present invention deployment system;
FIG. 6 is an enlarged structural side view of the tensioning system of the present invention;
FIG. 7 is an enlarged structural front view of a tensioned steel beam of the present invention;
FIG. 8 is an enlarged side view of the tensioned steel beam of the present invention.
Description of reference numerals:
1. the steel plate bracket comprises a pedestal, 2, a concrete terrace, 3, a steel plate bracket, 4, a steel backing plate, 5, an anchorage device, 6, a steel strand, 7, a bracket anchor bar, 8, a tension steel beam, 81, a web plate, 82, a flange plate, 83, a support plate, 84, a stiffening plate, 85, a through hole, 9, a steel wire rope, 10, a movable pulley block, 11, a fixed pulley block, 12, a steel wire rope clamp, 13, a center-penetrating jack, 14, a bearing frame, 15, a hoop, 16 and an extrusion sleeve.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In fig. 1 and 2 of the present application, the left side is a stretching end, and the right side is a releasing end. The left side or the right side in the left-right direction is the outer side as referred to herein.
As shown in fig. 1 and 2, the invention provides a pre-tensioning prestressed concrete production facility, which comprises a bearing system, a releasing system and a steel strand 6, wherein a steel plate bracket 3 is pre-embedded in the bearing system and used for bearing one end of the steel strand 6, and the releasing system releases the steel strand 6 in a way of connecting the other end of the steel strand 6 through a pulley block.
In the technical scheme, the pre-tensioning prestressed concrete production facility without the compression columns and the concrete corbels is a pre-tensioning concrete member pre-tensioning yard without the compression columns, the pre-tensioning concrete member pre-tensioning yard without the compression columns is adopted in the technical scheme, the pedestal 1 mode of pre-embedding the steel corbels and the pulley block placing and tensioning mode are adopted, the construction efficiency is high, a large number of measures and engineering materials are saved, the prestressed reinforcements can be loosened, and the operation is safe and quick.
In another technical scheme, as shown in fig. 1 to 4, the force bearing system comprises a pair of pedestals 1, a concrete terrace 2, steel plate corbels 3 and steel backing plates 4, wherein the pair of pedestals 1 are oppositely arranged and are respectively connected to two sides of the concrete terrace 2, the steel plate corbels 3 are pre-embedded on the pedestals 1 and are arranged at intervals along the width direction of the pedestals 1, the plurality of steel plate corbels 3 at the tensioning end are arranged to meet the requirement that steel strands 6 are correspondingly staggered one to one and pass between the adjacent steel plate corbels 3, the steel backing plates 4 are welded on the outer sides of the steel plate corbels 3 at the tensioning end and are provided with a plurality of round holes, and one end of each steel strand 6 just corresponds to pass through the plurality of round holes and is fixed through a sleeve type anchorage device 5 on the outer sides of the steel backing plates 4. Pedestal 1 is pistol handle formula pedestal 1, and the handle of a pair of pedestal 1 sets up relatively, it has bracket anchor 7, and it is located pedestal 1 to still weld on the steel sheet bracket 3.
Among the above-mentioned technical scheme, prestressing force transmits pistol handle formula pedestal 1 through pre-buried a plurality of pre-buried steel sheet corbels 3 on pistol handle formula pedestal 1 on, and transmit concrete terrace 2 through pedestal 1 on, the steel sheet bracket 4 of tensioning end welds on steel sheet corbel 3 according to design position, it is provided with the stretch-draw jack still to support on the steel sheet bracket 4, be used for carrying out the stretch-draw to steel strand wires 6, the steel sheet corbel 3 of putting the end of tensioning buries underground on pistol handle formula pedestal 1 of another in the stretch-draw place. The welding has bracket anchor 7 on the steel sheet bracket 3, and the steel sheet bracket 3 arranges with the steel strand 6 straggly according to the position of prestressing steel strand 6, and the parallel and level along the limit line exposes 1 face of pedestal highly should satisfy the tensile stress requirement, and about 1 face 200mm of general high pedestal, it has the round hole of diameter 18 ~ 20mm to bore according to the position of prestressing steel strand 6 on the steel backing plate 4, and the welding of steel backing plate 4 is in the outside of steel sheet bracket 3. The sleeve anchorage device 5 consists of an anchorage cup and anchorage device clamping pieces, and a single jack is adopted for symmetrical tensioning during tensioning.
In another technical scheme, as shown in fig. 1 and fig. 2 and fig. 5 and fig. 6, put a system including stretch-draw girder steel 8, wire rope 9, running block 10, fixed pulley group 11, wire rope clamp 12 and punching jack 13, the other end anchor of steel strand 6 is in the inboard of stretch-draw girder steel 8, and running block 10 sets up on stretch-draw girder steel 8, and fixed pulley group 11 sets up on putting the steel sheet bracket 3 of opening the end, cross winding is again in proper order on a plurality of pulleys of running block 10 and fixed pulley group 11 after wire rope 9 one end is fixed, the other end after wire rope 9 twines is connected to on punching jack 13, punching jack 13 is fixed in on the pedestal 1 of corresponding end, wire rope clamp 12 is used for carrying out the centre gripping to wire rope 9 and fixes.
In the technical scheme, a plurality of fixed pulleys on one side form a fixed pulley block 11 welded on a steel plate bracket 3, a plurality of movable pulleys form a movable pulley block 10 welded on a tension steel beam 8, the movable pulley blocks 10 and the fixed pulley blocks 11 on two sides are connected in a winding mode through a steel wire rope 9, one end of the steel wire rope 9 is fixed on the tension steel beam 8 and can also be fixed on the steel plate bracket 3, the other end of the steel wire rope 9 penetrates through a hollow end of a center-penetrating type jack 13 fixed on a pistol handle type pedestal 1 to be fixed through a steel wire rope clamp 12, the right side of the center-penetrating type jack 13 is a telescopic end, and the left side of the center-penetrating type jack is a fixed hollow end. A plurality of groups of rolling shafts and steel ring sleeves form a movable pulley block 10 or a fixed pulley block 11, and then are welded with a tension steel beam 8 or a steel plate bracket 3,
in another technical scheme, as shown in fig. 7 and 8, the steel beam 8 is formed by welding a web plate 81, a pair of flange plates 82, a pair of support plates 83 and a stiffening plate 84, the web plate 81 and the pair of flange plates 82 are connected to form a U-shaped structure with an opening facing outward, the pair of support plates 83 are fixed on the web plate 81 and symmetrically located between the pair of flange plates 82, a plurality of stiffening plates 84 are arranged between the pair of support plates 83, the web plate 81 is also provided with a plurality of through holes 85 for the steel strands 6 to pass through, the steel strands 6 are anchored inside the steel beam 8 through sleeve-type anchors 5, and the movable pulley block 10 is arranged between the support plates 83 and the flange plates 82. A groove-shaped support is adopted to stretch the steel beam 8, the movable pulley block 10 and the anchorage device 5 of the prestressed tendon form an organic whole body which is convenient to control, the stretching is safer and more reliable, and the stretching steel beam 8 is suspended and is not in contact with and fixed with the base. The telescopic anchorage 5 is of the same construction as the telescopic anchorage 5 described above.
In another technical scheme, one end of the steel wire rope 9 is fixed on the outer side of the tension steel beam 8 or the steel plate bracket 3 at the tension end after being locked by the extrusion sleeve 16 fixed on the tension steel beam 8.
In another technical scheme, a bearing frame 14 is fixed on the outer side of a steel plate bracket 3 at the releasing end, the steel wire rope 9 penetrates through the bearing frame 14 and then penetrates through a through type jack 13, and finally the steel wire rope is locked through a steel wire rope clamp 12, and the upper portion of the jack is fixed on the pedestal 1 through a fixing anchor ear 15. The bearing frame 14 can provide a bearing support for the through jack 13, the bearing frame 14 is abutted to the fixed end of the through jack 13, and the amplitude of the bearing frame can be limited in an auxiliary manner when the through jack 13 stretches and releases the steel wire rope 9, so that the steel wire rope 9 can be released successively.
In another technical scheme, the movable pulley blocks 10 and the fixed pulley blocks 11 are in a pair, the pair of movable pulley blocks 10 are respectively arranged between the upper flange plate 82 and the lower flange plate 83, the pair of fixed pulley blocks 11 are respectively arranged on the steel plate bracket 3 at intervals in the vertical direction, and the two steel wire ropes 9 are respectively wound up and down and then penetrate out of the through jack 13. The upper part and the lower part are respectively provided with a pair, so that the safety and the stability of the sheet placing are ensured.
The invention also provides an operation method of the pretensioned prestressed concrete production facility, which comprises the following steps:
s1: blanking the steel strand 6 according to the length of the prefabrication production line, wherein the end part of the steel strand 6 sequentially penetrates through a web plate 81 through hole 85 of the tension steel beam 8, is positioned in the tension steel beam 8 and is anchored through a sleeve anchorage device 5;
the blanking length of the steel strand 6 is equal to the sum of the actual distance between the tension steel beam 8 and the steel backing plate 4, the length of the anchorage device 5 and the reserved surplus length;
s2: fixing one end of a steel wire rope 9, sequentially and crosswise penetrating through a movable pulley block 10 and a fixed pulley block 11, enabling the movable pulley block 10 to be close to the fixed pulley block 11, penetrating the other end of the steel wire rope 9 through a bearing frame 14, then penetrating through a penetrating jack 13, tensioning the steel wire rope 9 by the penetrating jack 13 to enable the steel wire rope 9 to have certain tension, and then fixing the steel wire rope 9 by using a steel wire rope clamp 12;
blanking the steel strand 6 according to the length of a prefabricated production line, sequentially passing the steel strand 6 through a prestressed reinforcement hole on a web 81 of a tension steel beam 8 into a groove of the tension steel beam 8, anchoring by using an anchorage device 5, hammering an anchorage device clamping piece by using a hand hammer, then drawing a release steel wire rope 9 connecting the tension steel beam 8 and a tension end, tightening the steel wire rope 9 on a pulley block before tensioning the prestressed steel bar of the steel strand 6, enabling a movable pulley block 10 of the tension steel beam 8 and a fixed pulley block 11 fixed on a steel plate bracket 3 to be abutted, tensioning the steel wire rope 9 by using a through jack 13 to have certain tension, enabling the steel wire rope 9 to have the tension of 10kN by using a through jack 13 of the tension steel wire rope 9, and enabling the through jack 13 to be in an ejection state;
s3: after the other end of the steel strand 6 sequentially passes through the through hole 85 on the steel backing plate 4, the other end of the steel strand 6 is symmetrically tensioned by a tensioning jack arranged at the tensioning end, the tensioned steel strand 6 is anchored on the steel backing plate 4 by a sleeve anchor 5, and the tensioning jack is supported on the steel backing plate 4 by a bearing frame 14;
s4: binding component steel bars, erecting a template and pouring concrete;
s5: after the strength of the concrete member reaches the design requirement, releasing and tensioning the stress of the steel strand 6 through a releasing and tensioning system;
s6: the steel strands 6 between the concrete pattern members are cut by a cutting device.
In another technical solution, the step S5 specifically includes the following steps:
s51: returning oil to the penetrating jack 13 to release the steel wire rope 9 and further release the steel stranded wire 6;
s52: when the cross-core jack 13 only has about 5% of travel, the steel wire rope clamp 12 is clamped in the bearing frame 14 by the steel wire rope clamp 12, oil return is continued to enable the steel wire rope clamp 12 in the bearing frame 14 to be tightly pressed on a side plate of the bearing frame 14, and the steel wire rope clamp 12 is abutted against the side plate of the bearing frame 14, so that the steel wire rope 9 still has certain tension even if the telescopic end of the cross-core jack 13 is completely retracted;
s53: then the steel wire rope clamp 12 at the telescopic end of the feed-through jack 13 is disassembled, at the moment, the feed oil is fed into the feed-through jack 13, and the ejector rod is ejected by about 90 percent;
s54: then clamping the steel wire rope 9 by the steel wire rope clamp 12 at the telescopic end of the feed-through jack 13, continuously feeding oil, separating the steel wire rope clamp 12 in the bearing frame 14 from a side plate of the bearing frame 14, disassembling the steel wire rope clamp 12 in the bearing frame 14, and returning oil by the feed-through jack 13;
s55: and (5) repeating the steps in the circulating operation until the steel wire rope 9 is completely loosened.
In the technical scheme, after the strength of the prefabricated concrete reaches the relaxation strength, the penetrating jack 13 retracts to only leave 5% of travel, at the moment, the steel wire rope clamp 12 is clamped by the steel wire rope clamp 12 from the bearing frame 14, then the penetrating jack 13 retracts to the bottom continuously, the steel wire rope clamp 12 at the head of the penetrating jack 13 is released, the penetrating jack 13 is lifted by oil, when the travel reaches 90% of the travel, the steel wire rope clamp 12 is tightly attached to the head of the penetrating jack 13 to clamp the steel wire rope 9, then the penetrating jack 13 continues to lift, after the steel wire rope clamp 12 in the bearing frame 14 leaves the bottom plate of the bearing frame 14, the lifting is stopped, the steel wire rope clamp 12 in the bearing frame 14 is detached, the penetrating jack 13 returns oil, and then the operation is circulated until the steel wire rope 9 is completely released. At this time, the prestressed steel strand 6 can be cut smoothly.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. The pre-tensioning prestressed concrete production facility is characterized by comprising a bearing system, a releasing and tensioning system and a steel strand, wherein a steel plate bracket is pre-embedded in the bearing system and used for bearing one end of the steel strand, and the releasing and tensioning system is used for releasing and tensioning the steel strand in a mode that a pulley block is connected with the other end of the steel strand;
the bearing system comprises a pair of pedestals, a concrete terrace, steel plate corbels and steel base plates, wherein the pair of pedestals are oppositely arranged and are respectively connected to two sides of the concrete terrace, the steel plate corbels are pre-buried on the pedestals and are arranged at intervals along the width direction of the pedestals, the arrangement of the plurality of steel plate corbels at the stretching end meets the condition that the steel strands are staggered and pass through the space between the adjacent steel plate corbels one by one, the steel base plates are welded on the outer sides of the steel plate corbels at the stretching end and are provided with a plurality of round holes, and one end of each steel strand passes through the plurality of round holes and is fixed on the outer sides of the steel base plates through sleeve type anchorage devices;
the tension releasing system comprises a tension steel beam, a steel wire rope, a movable pulley block, a fixed pulley block, a steel wire rope clamp and a penetrating type jack, the other end of the steel wire rope is anchored on the inner side of the tension steel beam, the movable pulley block is arranged on the tension steel beam, the fixed pulley block is arranged on a steel plate bracket at the tension releasing end, one end of the steel wire rope is fixed and then sequentially and alternately wound on a plurality of pulleys of the movable pulley block and the fixed pulley block, the other end of the steel wire rope after being wound is connected to the penetrating type jack, the penetrating type jack is fixed on a pedestal at the corresponding end, and the steel wire rope clamp is used for clamping and fixing the steel wire rope;
one end of the steel wire rope is fixed on the outer side of the tension steel beam or a steel plate bracket at the tension releasing end after being locked by an extrusion sleeve fixed on the tension steel beam;
and a bearing frame is fixed on the outer side of the steel plate bracket at the releasing end, the steel wire rope penetrates through the bearing frame and then penetrates through the feed-through jack, the steel wire rope is finally locked through the steel wire rope clamp, and the upper part of the jack is fixed on the pedestal through the fixed hoop.
2. The pretensioned prestressed concrete production facility of claim 1, wherein said pedestal is a pistol grip type pedestal, the handles of a pair of pedestals are disposed opposite to each other, and a steel plate bracket is further welded with a bracket anchor which is located inside the pedestal.
3. The pre-tensioned prestressed concrete production facility according to claim 1, wherein said steel tensile beam is welded by a web plate, a pair of flange plates, a pair of support plates and a stiffening plate, said web plate and said pair of flange plates are connected in a U-shaped configuration with an opening facing outward, a pair of support plates are fixed on said web plate and symmetrically located between a pair of flange plates, a plurality of stiffening plates are arranged between a pair of support plates, said web plate is also provided with a plurality of through holes for the steel strands to pass through, said steel strands are anchored inside said steel tensile beam by means of sleeve anchors, and a movable pulley block is arranged between the support plates and the flange plates.
4. The pretensioned prestressed concrete production facility of claim 3, wherein said movable pulley block and said fixed pulley block are a pair, a pair of movable pulley blocks are respectively disposed between the upper and lower flange plates and the support plate, a pair of fixed pulley blocks are respectively disposed on the steel plate bracket at a vertical interval, and said two wire ropes are respectively disposed up and down and then passed out from the center-through jack.
5. The method of operating a pretensioned prestressed concrete production facility according to claim 1, comprising the steps of:
s1: blanking the steel strand according to the length of the prefabrication production line, wherein the end part of the steel strand sequentially penetrates through a web plate through hole of the tension steel beam, is positioned in the tension steel beam and is anchored through a sleeve anchorage device;
s2: fixing one end of a steel wire rope, sequentially and crossly penetrating through a movable pulley block and a fixed pulley block to enable the movable pulley block and the fixed pulley block to be close to each other, penetrating the other end of the steel wire rope through a force bearing frame and then penetrating through a center-penetrating jack, and tensioning the steel wire rope by the center-penetrating jack to enable the steel wire rope to have certain tension;
s3: after the other end parts of the steel strands sequentially penetrate through the through holes in the steel backing plate, the other end parts of the steel strands are symmetrically tensioned through tensioning jacks arranged at tensioning ends, and the tensioned steel strands are anchored on the steel backing plate through sleeve anchors;
s4: binding component steel bars, erecting a template and pouring concrete;
s5: after the strength of the concrete member reaches the design requirement, releasing and tensioning the stress of the steel strand through a releasing and tensioning system;
s6: and cutting off the steel strands among the concrete pattern members by using a cutting device.
6. The method for operating a pretensioned prestressed concrete production facility according to claim 5, wherein the step S5 specifically includes the steps of:
s51: returning oil to the penetrating jack to release and stretch the steel wire rope and further release and stretch the steel strand;
s52: when the cross-core jack only has about 5 percent of travel, the steel wire rope is clamped in the bearing frame to clamp the steel wire rope, and oil return is continued to ensure that the steel wire rope in the bearing frame is tightly clamped on a side plate of the bearing frame;
s53: then the steel wire rope clamp at the telescopic end of the feed-through jack is disassembled, and at the moment, the feed-through jack takes oil, and the ejector rod is ejected by about 90 percent;
s54: then clamping the steel wire rope by the steel wire rope clamp at the telescopic end of the feed-through jack, continuously feeding oil to separate the steel wire rope clamp in the bearing frame from the bearing frame side plate and disassemble the steel wire rope clamp in the bearing frame, and returning oil by the feed-through jack;
s55: and (4) repeating the steps in a circulating mode until the steel wire rope is completely loosened.
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| CN101597960A (en) * | 2009-07-17 | 2009-12-09 | 李延春 | Large-tonnage jack tension construction technology for non-bonded prestressed silo |
| CN102259388A (en) * | 2011-08-17 | 2011-11-30 | 中铁二十三局集团轨道交通工程有限公司 | Construction process for precasting prestressed pretensioned concrete U-shaped beams in rail transit |
| CN202169644U (en) * | 2011-07-13 | 2012-03-21 | 中国建筑第二工程局有限公司 | Pretensioning method prestressed concrete sheet pile integral tensioning base |
| CN105835226A (en) * | 2016-05-26 | 2016-08-10 | 中铁二十三局集团轨道交通工程有限公司 | Precast beam pedestal obtained through pre-tensioning method |
| CN110863440A (en) * | 2019-11-22 | 2020-03-06 | 李铮 | Auxiliary device used during arch bridge arch rib reinforcement |
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|---|---|---|---|---|
| CN101597960A (en) * | 2009-07-17 | 2009-12-09 | 李延春 | Large-tonnage jack tension construction technology for non-bonded prestressed silo |
| CN202169644U (en) * | 2011-07-13 | 2012-03-21 | 中国建筑第二工程局有限公司 | Pretensioning method prestressed concrete sheet pile integral tensioning base |
| CN102259388A (en) * | 2011-08-17 | 2011-11-30 | 中铁二十三局集团轨道交通工程有限公司 | Construction process for precasting prestressed pretensioned concrete U-shaped beams in rail transit |
| CN105835226A (en) * | 2016-05-26 | 2016-08-10 | 中铁二十三局集团轨道交通工程有限公司 | Precast beam pedestal obtained through pre-tensioning method |
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