CN113334569B - Tension releasing facility and tension releasing method for pre-tensioned prestressed concrete member - Google Patents
Tension releasing facility and tension releasing method for pre-tensioned prestressed concrete member Download PDFInfo
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- CN113334569B CN113334569B CN202110432199.5A CN202110432199A CN113334569B CN 113334569 B CN113334569 B CN 113334569B CN 202110432199 A CN202110432199 A CN 202110432199A CN 113334569 B CN113334569 B CN 113334569B
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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
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Abstract
The invention discloses a tension releasing facility and a tension releasing method for a pretensioned prestressed concrete member, wherein the tension releasing facility for the pretensioned prestressed concrete member comprises the following components: the pedestal is fixedly connected with a fixed pulley block; one side of the tensioning steel beam is fixedly connected with a movable pulley block, the movable pulley block is arranged opposite to the fixed pulley block, and the other side of the tensioning steel beam is anchored with an inherent prestressed steel strand; one end of the steel wire rope is fixed on the tensioning steel beam, and the other end of the steel wire rope is connected with a tensioning device after being wound between the movable pulley block and the fixed pulley block in a crossed manner; the tensioning device is fixedly arranged on the pedestal. The pretensioning prestressed concrete member releasing and tensioning construction method disclosed by the invention can not occupy the prestressed steel strands unnecessarily, can effectively avoid the waste of the prestressed steel strands, and is simple in structure, high in construction efficiency, high in construction safety and simple and convenient in technology.
Description
Technical Field
The invention relates to the technical field of road and bridge construction. More specifically, the invention relates to a pre-tensioning prestressed concrete member tension releasing facility and a tension releasing method.
Background
The pre-tensioning method is a construction process of firstly tensioning the prestressed steel strands before concrete is poured, temporarily anchoring the tensioned prestressed steel strands on a pedestal or a steel mould, then pouring concrete, releasing the prestressed steel strands after the concrete is cured to reach corresponding strength, and applying prestress to the concrete by means of bonding of the concrete and the prestressed steel strands.
When a pre-tensioning method prefabricated prestressed concrete member is loosened, a sandbox loosening process, a wedge loosening process and the like are mainly adopted, wherein the wedge loosening process is high in danger and is in a phase of elimination, a large steel beam is required to be adopted in the sandbox loosening process, material waste is high, the steel strands are wasted due to the space length of the steel beam and the sandbox, the sandbox is difficult to operate, the tensioning cannot be completely achieved, the steel strands still have certain stress, and prestress resilience during cutting can not only cause adverse effects on the member, but also threaten the safety of constructors.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a pretensioned prestressed concrete element relaxation facility including:
the pedestal is fixedly connected with a fixed pulley block;
one side of the tensioning steel beam is fixedly connected with a movable pulley block, the movable pulley block is arranged opposite to the fixed pulley block, and the other side of the tensioning steel beam is anchored with an inherent prestressed steel strand;
one end of the steel wire rope is fixed on the tensioning steel beam, and the other end of the steel wire rope is connected with a tensioning device after being wound between the movable pulley block and the fixed pulley block in a crossed manner; the tensioning device is fixedly arranged on the pedestal.
Preferably, the steel wire rope further comprises a bearing frame which is arranged between the fixed pulley block and the tensioning device, and the steel wire rope penetrates through the bearing frame after being wound between the movable pulley block and the fixed pulley block in a crossed manner and then is connected with the tensioning device.
Preferably, the device comprises a plurality of support plates which are embedded on the pedestal at intervals, and a plurality of pulleys in the fixed pulley group are correspondingly arranged on each support plate.
Preferably, the tensioning steel beam comprises a web plate and flange plates arranged on two sides of the web plate, and a plurality of pulleys in the movable pulley block are arranged between the two flange plates at intervals.
Preferably, the web plate is provided with a plurality of prestressed reinforcement holes, and the prestressed steel strands penetrate through the prestressed reinforcement holes and are anchored through an anchorage device.
Preferably, the pulley comprises a roller and a steel sleeve ring, and the steel sleeve ring is sleeved on the roller and can freely rotate along the axis of the roller.
Preferably, one end of the steel wire rope is fixed on the tensioning steel beam after being locked by the extrusion sleeve, and the other end of the steel wire rope is fixed by the steel wire rope clamp after being connected with the tensioning device.
A pretensioning prestressed concrete member releasing and tensioning method comprises the following steps:
s1, prefabricating the pedestal of the releasing end and the tensioning end;
s2, mounting the fixed pulley block, the force bearing frame and the tensioning device on the pedestal at the release end;
s3, blanking the prestressed steel strands, anchoring one ends of the prestressed steel strands with the tensioning steel beams, and then mounting the movable pulley block on the tensioning steel beams;
s4, installing the steel wire rope, drawing the steel wire rope to enable a movable pulley block on the tensioning steel beam to be abutted against a fixed pulley block, tensioning the steel wire rope by using the tensioning device to enable the steel wire rope to have certain tension, and fixing the steel wire rope by using a steel wire rope clamp;
s5, tensioning the other ends of the prestressed steel strands at the tensioning end, and anchoring the prestressed steel strands on the pedestal at the tensioning end;
s6, binding component steel bars, erecting a template, and pouring concrete; after the strength of the member concrete reaches the tension releasing strength, the tension releasing device is used for releasing tension at the releasing end;
and S7, cutting the prestressed steel strands between the members by using cutting equipment after the tension releasing is finished.
Preferably, in step S4, when the wire rope is installed, one end of the wire rope is fixed to the tension releasing steel beam through the pressing sleeve, and the other end of the wire rope is wound between the pulleys of the movable pulley block and the fixed pulley block in a crossing manner, passes through the force bearing frame, and is connected to the tension device.
Preferably, the process of releasing the tension using the tension device on the stand at the releasing end in step S6 includes the steps of:
s6-1, retracting the tensioning device, and clamping the steel wire rope in the bearing frame by using the steel wire rope when the tensioning device only has about 5% of travel;
s6-2, continuing to retract the tensioning device, so that the steel wire rope in the bearing frame is tightly clamped and pressed on the bearing frame bottom plate;
s6-3, detaching the steel wire rope clamp at the telescopic end of the tensioning device, jacking the tensioning device for tensioning, and clamping the steel wire rope at the telescopic end by the steel wire rope clamp when the telescopic end of the tensioning device is about 90% ejected out;
s6-4, continuing to lift the tensioning device for tensioning, separating the steel wire rope clamp in the bearing frame from the bearing frame bottom plate, and then detaching the steel wire rope clamp in the bearing frame;
s6-5, retracting the tensioning device, and repeating the steps S6-1 to S6-4 until the steel wire rope is completely loosened.
The invention at least comprises the following beneficial effects:
1. the fixed pulley block is fixed on the prefabricated pedestal, the movable pulley block is connected with the prestressed steel strand through the tension steel beam, the fixed pulley block and the movable pulley block are wound into a whole through the steel wire rope, and the steel wire rope is gradually loosened through the tension device, so that the aim of loosening the prestressed steel strand is fulfilled. The prestressed steel strands are blanked according to the size of the prefabricated prestressed component and the size of the anchorage device, and the fixed pulley block, the movable pulley block and the tensioning device do not occupy the prestressed steel strands unnecessarily, so that waste of the prestressed steel strands is avoided.
2. The invention adopts the tension releasing technology of the pulley block and the tension device, leads the prestress of the steel strand to release tension more thoroughly by stretching and releasing the steel wire rope for many times, greatly simplifies the prestress construction equipment and tools, and has high construction efficiency, more safety and simple technology.
3. The fixed pulley block can be arranged on a plurality of supporting plates, the supporting plates are arranged side by side and are embedded on the prefabricated pedestal at intervals, and prestress of the prestress steel strand can be transferred through the supporting plates.
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 a sheet release facility in an embodiment of the present invention;
FIG. 2 is a schematic side view of the sheet feeding apparatus according to the above embodiment of the present invention;
FIG. 3 is a partial enlarged side view of the tension releasing means according to the above embodiment of the present invention;
FIG. 4 is a top view of the tensioned steel beam according to the above embodiment of the present invention;
FIG. 5 is a side view of the tensioned steel beam according to the above embodiment of the present invention;
FIG. 6 is a side view of the support plate in the above embodiment of the present invention;
fig. 7 is a side view of the outrigger of the above embodiment of the invention.
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.
As shown in fig. 1 to 7, the present invention provides a pretensioned prestressed concrete member relaxation facility, comprising:
the pedestal 1 is fixedly connected with a fixed pulley block 6;
one side of the tension steel beam 4 is fixedly connected with a movable pulley block 5, the movable pulley block 5 is arranged opposite to the fixed pulley block 6, and the other side of the tension steel beam 4 is anchored with a prestressed steel strand 11;
one end of the steel wire rope 10 is fixed on the tensioning steel beam 4, and the other end of the steel wire rope is connected with the tensioning device 8 after being crossed and wound between the movable pulley block 5 and the fixed pulley block 6; the tensioning device 8 is fixedly arranged on the pedestal 1.
In this embodiment, the pedestal 1 is a prefabricated pedestal, and a preferred shape of the pedestal 1 may be a pistol grip type in consideration of the installation position and the expanding/expanding process of each component in the expanding/expanding facility. The fixed setting of crown block 6 is in on the pedestal 1, movable pulley block 5 passes through stretch-draw girder steel 4 is connected with prestressing steel strand wires 11, crown block 6 with constitute a whole through the winding of wire rope 10 between movable pulley block 5, wire rope 10 with tensioning device 8 is connected, through tensioning device 8 progressively relaxs wire rope 10 reaches and relaxs prestressing steel strand wires 11's purpose. In the present embodiment, the tension device 8 is exemplified by a center-through jack, but the tension device 8 is not limited thereto, and another type of tension device may be selected. The tensioning device 8 can be fixed on the pedestal through a fixing hoop.
Compared with the conventional sandbox loosening process, the technical scheme can effectively overcome the defect that the sandbox loosening process needs to adopt a large steel beam, and the steel beam and the spatial length of the sandbox per se cause great waste of steel strands, and on the other hand, the manual operation of the sandbox per se is also difficult. This technical scheme adopts the crown block 6 the running block 5 adds tensioning device 8 carries out prestressing force steel strand 11 and puts a tension, prestressing force steel strand 11 carry out the unloading according to prestressing force component and ground tackle size can, can not be unnecessary to occupy prestressing force steel strand 11 to can not cause prestressing force steel strand 11's waste. And this technical scheme simple structure easily operates, can thoroughly put the piece to prestressing force steel strand 11, improves the degree of safety of construction.
In another embodiment, the steel wire rope tensioning device further comprises a bearing frame 7 arranged between the fixed pulley block 6 and the tensioning device 8, and the steel wire rope 10 penetrates through the bearing frame 7 after being wound between the movable pulley block 5 and the fixed pulley block 6 in a crossing manner and then is connected with the tensioning device 8. The bearing frame 7 can provide stressed support for the tensioning device 8, and can also assist in limiting the amplitude of the steel wire rope 10 when the tensioning device 8 tensions and releases the steel wire rope 10, so that the steel wire rope 10 can be gradually released. The bearing frame 7 comprises an upper bottom plate 71, a lower bottom plate 73 and a plurality of support rods 72 clamped between the upper bottom plate 71 and the lower bottom plate 73, the steel wire rope 10 sequentially penetrates through the upper bottom plate 71 and the lower bottom plate 73, and the lower bottom plate 73 is abutted to the fixed end of the tensioning device 8.
In another embodiment, the device further comprises a plurality of support plates 2 which are embedded on the pedestal 1 at intervals, and a plurality of pulleys 15 in the fixed pulley group 6 are correspondingly arranged on each support plate 2. The backup pad 2 is pre-buried through the anchor bar on the pedestal 1, a plurality of the 2 layouts in a row of backup pad are used for the transmission prestressing force of prestressing force stranded wire 11. Each supporting plate 2 is welded with one pulley 15, and the pulleys 15 on the supporting plates 2 jointly form the fixed pulley block 6.
In another embodiment, the tension steel beam 4 comprises a web 43 and flange plates 41 arranged on both sides of the web 43, and the pulleys 15 in the movable pulley group 5 are arranged between two flange plates 41 at intervals. The both sides face welding of web 43 length direction has flange plate 41, stretch-draw girder steel 4 with do not have between the pedestal 1 and be connected, can freely remove, consequently set up two a plurality of pulleys 15 between the flange plate 41 have constituted jointly movable pulley block 5.
In another embodiment, the web 43 is provided with a plurality of prestressed reinforcement holes 42, and the prestressed steel strand 11 is anchored by an anchor after passing through the prestressed reinforcement holes 42. And two ends of the tension steel beam 4 are respectively connected with the prestressed steel strand 11 and the movable pulley block 5, and the movable pulley block 5 and the fixed pulley block 6 are connected through the steel wire rope 10. Therefore, when the movable pulley block 5 and the fixed pulley block 6 are tightly closed together and the tension device 8 provides a certain pre-tension force to the steel wire rope, the pre-stressed steel strand 11 and the steel wire rope 10 are indirectly connected together, so that the purpose of loosening the pre-stressed steel strand 11 can be achieved by loosening the steel wire rope.
In another embodiment, the pulley 15 includes a roller 151 and a steel collar 152, and the steel collar 152 is sleeved on the roller 151 and can freely rotate along the axis of the roller 151. The web plate 43 of the tension steel beam 4 is symmetrically provided with two support plates 44 along the axis thereof, a plurality of stiffening plates 45 are uniformly arranged between the two support plates 44 at intervals, and the support plates 44 and the stiffening plates 45 are used for improving the overall strength of the tension steel beam 4.
Two ends of a roller 151 of a plurality of pulleys 15 in the movable pulley block 5 respectively penetrate through the support plate 44 and are fixedly connected with the flange plate 41. The steel collar 152 is clamped between the support plate 44 and the flange plate 41 on the same side of the axis of the web 43, and the support plate 44 and the flange plate 41 jointly limit the steel collar 152 to move along the axis of the roller 151, but the steel collar 152 can still freely rotate around the roller 151.
A plurality of in the crown block group 6 roller bearing 151 both ends fixed connection of pulley 15 is in on the backup pad 2, be close to on the backup pad 2 roller bearing 151 both ends department sets up flutedly, the steel lantern ring 151 card is established in the recess, the recess has restricted steel lantern ring 152 is followed roller bearing 151's axis removes, nevertheless steel lantern ring 152 still can wind roller bearing 151 free rotation.
When the steel wire ropes 10 are wound between the movable pulley block 5 and the fixed pulley block 6 in a crossing manner, the steel wire ropes are wound on the steel sleeve rings 152 of the pulleys 15 respectively.
In another embodiment, one end of the steel wire rope 10 is fixed on the tension steel beam 4 after being locked by the extrusion sleeve 3, and the other end of the steel wire rope is fixed by the steel wire rope clamp 9 after being connected with the tension device 8. One end of the steel wire rope 10 can be fixed on the outer side of the tension steel beam 4 after being locked by the extrusion sleeve 3, and also can be fixed on the supporting plate 2, namely the steel wire rope 10 can be selected to be wound in a cross way from one of the movable pulley block 5 and the fixed pulley block 6. After the steel wire rope 10 is sequentially connected with the movable pulley block 5, the fixed pulley block 6, the bearing frame 7 and the tensioning device 8, the steel wire rope 10 needs to be provided with certain tension through the tensioning device 8, and after the tensioning of the tensioning device 8 is completed, the steel wire rope 10 is fixed through the steel wire rope clamp 9.
A pre-tensioning method prestressed concrete member releasing and tensioning method is characterized by comprising the following steps:
s1, prefabricating the pedestal 1 with a releasing end and a tensioning end;
in the present embodiment, the basic layout of the prestressed prefabricated units is such that one said pedestal 1 is provided at each of its two ends. Before prefabricating the platform 1, a flat ground is selected for leveling and is properly compacted to meet the bearing capacity requirement of a prestressed prefabricated part. Concreting forms after the foundation ditch excavation shaping of pedestal 1 to here simultaneously pedestal 1 is pre-buried backup pad 2. Both ends be concrete terrace 13 between the pedestal 1, pedestal 1 with concrete terrace 13's the connection face should set up the parting, in order to prevent concrete terrace 13 is because of the too big shrink fracture that appears of length during the shutdown.
S2, mounting the fixed pulley block 6, the carrier 7 and the tensioning device 8 on the pedestal 1 at the release end;
in view of the fact that the prestressed prefabricated components are in factory construction, and in order to facilitate the arrangement and construction safety of the relaxation setting, in the embodiment, one end of each prestressed prefabricated component is used as a stretching end, and the other end of each prestressed prefabricated component is used as a relaxation end.
S3, blanking the prestressed steel strands 11, anchoring one ends of the prestressed steel strands 11 with the tension steel beam 4, and then installing the movable pulley block 5 on the tension steel beam 4;
in order to avoid waste prestressed steel 11, prestressed steel strand 11 will be according to the end of loosing stretch-draw girder steel 4 and stretch-draw end the actual distance unloading between the steel backing plate 12 of backup pad 2 one side, unloading length equals stretch-draw girder steel 4 with the sum of actual distance, ground tackle length and the surplus length of reserving between the steel backing plate 12. The steel backing plate is fixedly connected to one side, far away from the releasing end, of the supporting plate 2.
S4, installing the steel wire rope 10, drawing the steel wire rope 10 to enable the movable pulley block 5 on the tensioning steel beam 4 to be abutted against the fixed pulley block 6, and then tensioning the steel wire rope 10 by using the tensioning device 8 to enable the steel wire rope 10 to have certain tension and then to be fixed by using a steel wire rope clamp 9;
s5, tensioning the other ends of the prestressed steel strands 11 at the tensioning end, and anchoring the other ends on the pedestal 1 at the tensioning end;
and tensioning the other end of the prestressed steel strand 11 on the pedestal 1 at the tensioning end by using tensioning equipment such as a jack, and anchoring the tensioned prestressed steel strand 11 on the steel backing plate 12 by using a sleeve anchorage.
S6, binding component steel bars, erecting a template, and pouring concrete; after the strength of the member concrete reaches the tension releasing strength, the tension releasing device is used for releasing tension at the releasing end;
and S7, cutting the prestressed steel strand 11 between the members by using cutting equipment after the tension releasing is finished.
In step S4, when the wire rope 10 is installed, one end of the wire rope 10 is first fixed to the tension releasing steel beam 4 through the pressing sleeve 3, and the other end thereof is then cross-wound between the pulleys 15 of the movable pulley block 5 and the fixed pulley block 6, and then passes through the force bearing frame 7 and is connected to the tension device 8.
The process of releasing tension using the tension device 8 on the pedestal 1 at the releasing end in step S6 includes the steps of:
s6-1, retracting the tensioning device 8, and clamping the steel wire rope 10 in the bearing frame 7 by using the steel wire rope when only about 5% of travel is left;
s6-2, continuing to retract the tensioning device 8, so that the steel wire rope in the bearing frame 7 is tightly clamped and pressed on the bottom plate of the bearing frame 7;
s6-3, detaching the steel wire rope clamp 9 at the telescopic end of the tensioning device 8, jacking the tensioning device 8 for tensioning, and clamping the steel wire rope 10 at the telescopic end by the steel wire rope clamp when the telescopic end is about 90% ejected;
s6-4, continuing to lift the tensioning device 8 for tensioning, separating the steel wire rope clamp in the bearing frame 7 from the bottom plate of the bearing frame 7, and then detaching the steel wire rope clamp in the bearing frame 7;
s6-5, retracting the tensioning device 8, and repeating the steps S6-1 to S6-4 until the steel wire rope 10 is completely loosened.
In step S4, the tensioning device 8 applies a certain pulling force to the steel cable 10, so that the telescopic end thereof is in an ejection state, and in an initial state of the releasing and tensioning process, the telescopic end of the tensioning device 8 needs to be retracted first to release the steel cable 10. The steel wire rope clamp is abutted against the upper bottom plate 71 of the bearing frame 7, so that the steel wire rope 10 still has certain tension even if the telescopic end of the tensioning device 8 is completely retracted.
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 (7)
1. A pretensioning prestressed concrete member releasing and tensioning facility is characterized by comprising:
the pedestal is fixedly connected with a fixed pulley block;
one side of the tensioning steel beam is fixedly connected with a movable pulley block, the movable pulley block is arranged opposite to the fixed pulley block, and the other side of the tensioning steel beam is anchored with an inherent prestressed steel strand;
one end of the steel wire rope is fixed on the tensioning steel beam, and the other end of the steel wire rope is connected with a tensioning device after being wound between the movable pulley block and the fixed pulley block in a crossed manner; the tensioning device is fixedly arranged on the pedestal;
the supporting plates are embedded on the pedestal at intervals, and a plurality of pulleys in the fixed pulley group are correspondingly arranged on each supporting plate;
the bearing frame is arranged between the fixed pulley block and the tensioning device, and the steel wire rope penetrates through the bearing frame after being wound between the movable pulley block and the fixed pulley block in a crossing manner and then is connected with the tensioning device;
one end of the steel wire rope is fixed on the tensioning steel beam after being locked by the extrusion sleeve, and the other end of the steel wire rope is fixed by the steel wire rope clamp after being connected with the tensioning device.
2. The pretensioned prestressed concrete structure relaxation facility of claim 1, wherein said tensioned steel beam comprises a web and flange plates disposed on both sides of said web, and wherein a plurality of pulleys of said movable pulley block are disposed at intervals between two of said flange plates.
3. The pretensioning prestressed concrete member relaxation facility according to claim 2, wherein the web is provided with a plurality of prestressed reinforcement holes, and the prestressed steel strands are anchored by anchors after passing through the prestressed reinforcement holes.
4. The pretensioned prestressed concrete structure tensioning arrangement according to claim 2, wherein said pulley comprises a roller and a steel collar, said steel collar being fitted around said roller and freely rotatable about the axis of said roller.
5. A releasing-tensioning method of a releasing-tensioning facility for pretensioned prestressed concrete elements according to any of claims 1 to 4, characterized in that it comprises the following steps:
s1, prefabricating the pedestal of the releasing end and the tensioning end;
s2, mounting the fixed pulley block, the force bearing frame and the tensioning device on the pedestal at the release end;
s3, blanking the prestressed steel strands, anchoring one ends of the prestressed steel strands with the tensioning steel beams, and then mounting the movable pulley block on the tensioning steel beams;
s4, installing the steel wire rope, drawing the steel wire rope to enable a movable pulley block on the tensioning steel beam to be abutted against a fixed pulley block, tensioning the steel wire rope by using the tensioning device to enable the steel wire rope to have certain tension, and fixing the steel wire rope by using a steel wire rope clamp;
s5, tensioning the other ends of the prestressed steel strands at the tensioning end, and anchoring the prestressed steel strands on the pedestal at the tensioning end;
s6, binding component steel bars, erecting a template, and pouring concrete; after the strength of the member concrete reaches the tension releasing strength, the tension releasing device is used for releasing tension at the releasing end;
and S7, cutting the prestressed steel strands between the members by using cutting equipment after the tension releasing is finished.
6. The method for releasing tension of a pretensioned prestressed concrete structure according to claim 5, wherein in step S4, when the wire rope is installed, one end of the wire rope is first fixed to the tension steel beam through the squeeze sleeve, and the other end of the wire rope is cross-wound between the pulleys of the movable pulley block and the fixed pulley block, and then passes through the force-bearing frame and is connected to the tension device.
7. The pretensioned prestressed concrete structure of claim 5, wherein the releasing of the tension using the tension means of the releasing end of said stand in step S6 comprises the steps of:
s6-1, retracting the tensioning device, and clamping the steel wire rope in the bearing frame by using the steel wire rope when the tensioning device only has about 5% of travel;
s6-2, continuing to retract the tensioning device, so that the steel wire rope in the bearing frame is tightly clamped and pressed on the bearing frame bottom plate;
s6-3, detaching the steel wire rope clamp at the telescopic end of the tensioning device, jacking the tensioning device for tensioning, and clamping the steel wire rope at the telescopic end by the steel wire rope clamp when the telescopic end of the tensioning device is about 90% ejected out;
s6-4, continuing to lift the tensioning device for tensioning, separating the steel wire rope clamp in the bearing frame from the bearing frame bottom plate, and then detaching the steel wire rope clamp in the bearing frame;
s6-5, retracting the tensioning device, and repeating the steps S6-1 to S6-4 until the steel wire rope is completely loosened.
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| CN202110432199.5A CN113334569B (en) | 2021-04-21 | 2021-04-21 | Tension releasing facility and tension releasing method for pre-tensioned prestressed concrete member |
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| CN202110432199.5A CN113334569B (en) | 2021-04-21 | 2021-04-21 | Tension releasing facility and tension releasing method for pre-tensioned prestressed concrete member |
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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 |
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