CN108708498B - External prestress reinforced concrete frame beam structure and construction method thereof - Google Patents
External prestress reinforced concrete frame beam structure and construction method thereof Download PDFInfo
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- CN108708498B CN108708498B CN201810744717.5A CN201810744717A CN108708498B CN 108708498 B CN108708498 B CN 108708498B CN 201810744717 A CN201810744717 A CN 201810744717A CN 108708498 B CN108708498 B CN 108708498B
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 210000002435 tendon Anatomy 0.000 claims abstract description 93
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000000338 in vitro Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims description 2
- 241000940966 Dexia Species 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229920006334 epoxy coating Polymers 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention provides an external prestress reinforced concrete frame beam structure and a construction method thereof, belonging to the technical field of constructional engineering. The tensioning end structure is positioned below the middle beam bottom of each span frame beam, each group of external prestressed tendons passes through the tensioning end structure in the span after being turned by the corresponding turning device, and the tensioning end structure adopts an annular anchorage device to overlap and tension the two groups of external prestressed tendons; and only one tensioning end structure is arranged at the middle Liang Dexia side of each span of frame beam, so that the number of the tensioning end structures is effectively reduced. In addition, the tensioning end structure is arranged below the bottom of each span of frame beam, so that the tensioning end structure does not occupy the use space above a floor or a roof, and in addition, holes are not required to be formed on the floor or the roof during external prestress installation construction; and the prestressed tendons can be subjected to tensioning or replacement when the external prestressed tendons are loosened during use.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to an in-vitro prestressed reinforced concrete frame beam structure and a construction method thereof.
Background
The prestressed tendons are arranged inside the concrete beam, namely conventional prestressing, and outside the concrete beam, namely external prestressing. The external prestress reinforcement is a method for reinforcing structural members or the whole structure by adopting external prestress ribs, and is characterized in that the internal force distribution of the original structure is changed and the stress level of the original structure is reduced by applying prestress means, and the special stress and strain hysteresis in the general reinforced structure is eliminated, so that the post-added part and the original structure can work together better, and the overall bearing capacity of the structure can be obviously improved.
However, the application of the in-vitro prestress reinforcement technology in the building engineering is not too much at present, and the main reasons are as follows:
1) The prestress tensioning end is required to be arranged above the floor board or the roof board, and normal use functions of the building are affected after reinforcement;
2) The external prestressed tendons are in a folded line shape, the prestress loss is large, the external prestressed tendons are arranged in a single span mode and are required to be tensioned at two ends, and tensioning nodes are more; when the multi-span continuous arrangement is carried out, the external prestressed tendons need to be lapped and tensioned, and the tensioning node structure is complex;
3) When the external prestressed tendons are installed and positioned, holes are needed to be formed on the floor or roof slab, so that the normal use function of the floor where the building reinforcing beam is positioned is affected, and when the external prestressed tendons are the roof slab, the waterproof system of the roof is damaged;
4) When the external prestressed tendons are relaxed during use, the external prestressed tendons cannot be subjected to tensioning.
Disclosure of Invention
Aiming at the technical defects of the existing external prestress reinforcement, the invention provides an external prestress reinforcement concrete frame beam structure and a construction method thereof, wherein only one prestress tension end structure is needed to be arranged at each span of frame beams, and the tension end structure is arranged at the bottom of the frame beams, so that the node structure of the tension end structure is simplified, the number of the tension end structure is reduced, the building area of a floor plate and a roof plate is not occupied, the using function of the building is not influenced, and holes are not needed to be opened on the floor plate or the roof plate during the external prestress installation construction; in addition, the external prestressed tendons can be arranged in multi-span continuous mode, and the reinforcement efficiency is high; in addition, when the prestress is relaxed, the external prestress rib can be additionally tensioned or replaced, and the like, so that the reinforcement effect is good.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides an external prestressing force reinforcement concrete frame beam structure, includes two sets of external prestressing tendons, stretch-draw end structure, fixed end structure and turns to the device, stretch-draw end structure is located the middle part underbeam of every frame roof beam of striding, the stretch-draw end structure adopts annular ground tackle to overlap joint and stretch-draw two sets of external prestressing tendons, the one end of two sets of external prestressing tendons wears to locate in the stretch-draw end structure from opposite direction respectively, the other end of two sets of external prestressing tendons is anchored respectively on the fixed end structure or wears to locate in the frame roof beam in frame post department between the adjacent frame roof beam and the beam that is perpendicular to the frame roof beam behind the beam and locate in the middle part underbeam of adjacent frame roof beam, every external prestressing tendons of group turns to through respective turning to the device, turn to the device and set up in the frame roof beam bottom between stretch-draw end structure and fixed end structure or set up the frame roof beam bottom between the turning to the through-hole of stretch-draw end structure and frame post.
Preferably, in the external prestress reinforced concrete frame beam structure, the external prestress rib adopts unbonded steel strands or epoxy coating steel strands.
Preferably, in the external prestress reinforced concrete frame beam structure, stretching of the external prestress rib adopts an angle-changing stretching mode, and an angle-changing steering device and a stretching jack are sequentially arranged on one side of the stretching end structure.
Preferably, in the external prestress reinforced concrete frame beam structure, the annular anchorage device comprises an anchor plate with the same number but opposite taper holes and matched clamping pieces arranged in the taper holes, so that the threading and tensioning of two groups of external prestress tendons in opposite directions can be realized.
Preferably, in the external prestress reinforced concrete frame beam structure, one group of external prestress ribs of the two groups of external prestress ribs penetrate through the middle of the anchor plate and serve as prestress ribs stretching in advance, and the other group of external prestress ribs penetrate through the outer area of the anchor plate.
Preferably, in the external prestress reinforced concrete frame beam structure, the fixed end structure is positioned above the central axis of the cross section of the frame beam.
Preferably, in the external prestress reinforced concrete frame beam structure, each group of external prestress ribs is divided into two bundles of prestress ribs, the two bundles of prestress ribs are arranged on two sides of the frame beam, one ends of the two bundles of prestress ribs are converged after passing through the steering device and penetrate into the tensioning end structure, and the other ends of the two bundles of prestress ribs are respectively anchored on corresponding fixed end structures on two sides of the frame beam after being steered through the steering device or respectively penetrate through frame columns between adjacent frame beams after being steered through the steering device and penetrate into the tensioning end structure of the adjacent frame beam after being perpendicular to the frame beams.
Preferably, in the external prestress reinforced concrete frame beam structure, each external prestress rib comprises two external prestress ribs, four external prestress ribs of the same group penetrating through the middle of the anchor plate are distributed on the top of a square, four external prestress ribs of the other group penetrating through the outer area of the anchor plate are distributed on the top of a rectangle, the square coincides with the center of the rectangle and is parallel to the side line, and the square is located in the rectangle.
Preferably, in the external prestress reinforced concrete frame beam structure, a transverse through hole is formed in a frame column between adjacent frame beams and a beam perpendicular to the frame beams, a sleeve is arranged in the through hole, two end faces of the sleeve are flush with two side faces of the beam perpendicular to the frame beams, steering blocks are respectively arranged at two ends of the sleeve and are respectively fixed on the frame column between the adjacent frame beams, the sleeve is provided with a through sleeve through hole, the steering blocks are provided with a through steering block through hole, the bottom of the steering block through hole is gradually lowered from a direction close to the sleeve side direction away from the sleeve side direction, and the sleeve through hole and the two steering block through holes are combined to form a steering through hole.
The invention also discloses a construction method of the in-vitro prestress reinforced concrete frame beam structure, which comprises the following steps:
step one, carrying out external prestress reinforcement design on a frame beam according to known load conditions, and determining the dosage of external prestress tendons;
step two, blanking the external prestressed tendons, and processing and manufacturing a fixed end structure and a steering device;
step three, positioning and mounting a fixed end component and a steering device: firstly polishing and cleaning the surface for butt joint between the fixed end structure and the frame beam and the surface for butt joint between the steering device and the frame beam, then respectively fixing the fixed end structure and the steering device on the frame beam by using structural adhesive and using an anchor bolt, and filling and compacting gaps between the fixed end steel member and the frame beam by using epoxy mortar or shrinkage-free mortar;
step four, in-vitro prestress rib beam penetration and installation;
installing an annular anchor at a tensioning end and tensioning the prestressed tendons, wherein the external prestressed tendons are tensioned by adopting a variable angle tensioning process, the tensioning is mainly controlled by a tensioning force, the deviation between an actually measured extension value and a calculated extension value is not more than +/-6%, only one group of external prestressed tendons is tensioned during construction, the annular anchor moves towards the reverse direction of the tensioning force gradually along with the continuous increase of the stretching force of the tensioning force and the external prestressed tendons in the tensioning process, so that the tensioning of the other group of external prestressed tendons is driven by the phase change, and when the tensioning forces of the two groups of external prestressed tendons in different directions reach a design value, the stress of the annular anchor is balanced and does not move any more, the anchoring is carried out, and the tensioning is finished;
and step six, after the external prestressed tendons are tensioned, protecting the external prestressed tendons, the tensioning end structure, the fixed end structure and the steering device.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
according to the external prestress reinforced concrete frame beam structure and the construction method thereof, on one hand, each span of frame beam is provided with one tensioning end structure at the middle Liang Dexia side, and the tensioning end structure adopts the annular anchor to overlap and tension two groups of external prestress ribs, so that the number of tensioning end structures is effectively reduced, and the structure of the tensioning end structure is simplified. On the other hand, the tensioning end structure is arranged below the bottom of each span of frame beam, so that the using space on the floor plate or roof plate is not occupied, the using function of the building is not influenced, and holes are not required to be formed on the floor plate or roof plate during construction, thereby avoiding influencing the using function of the building and the waterproof system of the floor or roof. In still another aspect, the tensioning end structure is arranged below the bottom of each span of frame beam, and the space above the floor board or roof board is not occupied, so that the external prestressed tendons can reserve the operation length required by tensioning, and the prestressed tendons can be subjected to tensioning or replacement when the prestressed tendons are relaxed during use. In addition, the external prestressed tendons can be arranged in multi-span continuous mode, and the reinforcement efficiency is high.
Drawings
Fig. 1 is a layout view of a single-span frame beam body external prestress reinforcement plane according to an embodiment of the present invention.
Fig. 2 is an external prestress reinforcement elevation view of a single-span frame beam body according to an embodiment of the invention.
Fig. 3 is a sectional view of fig. 1-1.
Fig. 4 is a schematic structural view of a fixed end structure according to an embodiment of the invention.
Fig. 5 is a layout view of the external prestress reinforcement of two or more frame beams according to an embodiment of the present invention.
Fig. 6 is an elevation view of external prestress reinforcement of two or more frame beams according to an embodiment of the present invention.
In the figure: 1-external prestressed tendons, 2-tensioning end structures, 21-anchor plates, 3-fixed end structures, 31-bearing plates, 32-extrusion anchors, 33-fixed end steel members, 34-oblique support plates, 4-steering devices, 5-frame beams, 6-frame columns, 7-bushings, 71-bushing through holes, 8-steering blocks, 81-steering block through holes, 9-angle-changing steering devices, 10-tensioning jacks and 11-beams perpendicular to the frame beams.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. Advantages and features of the invention will become more apparent from the following description and from the claims. The technical contents and features of the present invention will be described in detail below with reference to the attached drawings by way of the illustrated embodiments. It should be further noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. For convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this should not be construed as a limitation of the technical scheme of the present invention.
Referring to fig. 1 to 6, the embodiment discloses an external prestress reinforced concrete frame beam structure, which comprises at least two groups of external prestress ribs 1, a tensioning end structure 2, a fixed end structure 3 and a steering device 4, wherein the tensioning end structure 2 is positioned below the middle beam bottom of each span frame beam 5, the tensioning end structure 2 adopts an annular anchor to lap and tension the two groups of external prestress ribs 1, one ends of the two groups of external prestress ribs 1 respectively penetrate through the tensioning end structure 2 from opposite directions, the other ends of the two groups of external prestress ribs 1 are respectively anchored on the fixed end structure 3 or penetrate through frame columns between adjacent span frame beams 5 and penetrate through the tensioning end structure 2 positioned below the middle beam bottom of each span frame beam 5 after penetrating through beams 11 perpendicular to the frame beams, each group of external prestress ribs 1 are steered through respective steering devices 4, and the steering device 4 is arranged at the bottom of the frame beam 5 between the tensioning end structure 2 and the fixed end structure 3 or at the bottom of the frame beam 5 between the tensioning end structure 2 and steering through holes of the frame columns 6.
On one hand, compared with the single-span arrangement of the prestressed tendons in the prior art, the two ends are required to be tensioned, and the tensioning nodes are more; when the multi-span continuous arrangement is carried out, the prestressed tendons need to be lapped and tensioned, and the tensioning node structure is complex; in the external prestress reinforced concrete frame beam structure of the embodiment, a tensioning end structure 2 is arranged at the middle Liang Dexia side of each span frame beam 5, and the tensioning end structure 2 adopts an annular anchorage device to lap and tension two groups of external prestress ribs 1, so that the number of the tensioning end structures 2 is effectively reduced, and the structure of the tensioning end structure 2 is simplified.
On the other hand, compared with the prior art, the external prestress tensioning end needs to be arranged above the floor board or roof slab, and when the prestress rib is installed and positioned, the floor board or the roof slab needs to be provided with holes, so that the floor building using function of the reinforcing beam is affected, and when the prestress tensioning end is the roof slab, the waterproof system of the roof is damaged; in the external prestress reinforced concrete frame beam structure of the embodiment, the tensioning end structure 2 is arranged below the bottom of each span of frame beam 5, so that the space above a floor plate or a roof plate is not occupied, the using function of a building is not influenced, a hole is not required to be formed in the floor plate or the roof plate, and the using function of the building and the waterproof system of the floor plate or the roof are not influenced.
On the other hand, as a certain stretching operation length is required to be reserved for prestress stretching, the stretching end structure 2 of the traditional method protrudes above the floor and is not allowed to be reserved, otherwise, more floor space is occupied, so that the prior art cannot carry out the stretch-compensating when the prestress rib is relaxed during the use; in the external prestress reinforced concrete frame beam structure of the embodiment, the tensioning end structure 2 is arranged below the bottom of each span of frame beam 5, and the space above a floor board or a roof board is not occupied, so that the prestress rib can reserve the operation length required by tensioning, and the prestress rib can be subjected to tensioning or replacement when the prestress rib is loosened during use.
For reinforcement of external prestress of a single-span frame beam, please refer to fig. 1 to 2, the tensioning end structure 2 adopts an annular anchor to lap and tension two groups of external prestress ribs 1, one ends of the two groups of external prestress ribs 1 are respectively penetrated in the tensioning end structure 2 from opposite directions, the other ends of the two groups of external prestress ribs 1 are respectively anchored on the fixed end structure 3, each group of external prestress ribs 1 is steered through a respective steering device 4, and the steering device 4 is arranged between the tensioning end structure 2 and the fixed end structure 3.
For reinforcement of external prestress of two or more frame beams, please refer to fig. 5 to 6, the tensioning end structure 2 adopts an annular anchor to lap and tension the two groups of external prestress ribs 1, one ends of the two groups of external prestress ribs 1 are respectively penetrated in the tensioning end structure 2 from opposite directions, the other ends of the two groups of external prestress ribs 1 are respectively anchored on the fixed end structure 3 or penetrated in the tensioning end structure 2 below the middle beam bottom of the adjacent frame beam 5 after penetrating through the frame column between the adjacent frame beams 5 and the beam 11 perpendicular to the frame beam, each group of external prestress ribs 1 is steered by a respective steering device 4, and the steering device 4 is arranged at the bottom of the frame beam 5 between the tensioning end structure 2 and the fixed end structure 3 or at the bottom of the frame beam 5 between steering through holes of the tensioning end structure 2 and the frame column 6.
Preferably, in the external prestress reinforced concrete frame beam structure, the steering device 4 is a semi-cylinder fixed at the bottom of the frame beam 5. By arranging the steering device 4 with the structure, the external prestressed tendon 1 is ensured to steer smoothly at the position, so that the external prestressed tendon 1 forms a line shape favorable for the structure.
Because tensioning of one group of prestressed tendons is influenced by shielding of the other group of prestressed tendons, and tensioning of the external prestressed tendons 1 cannot be performed by installing a tensioning jack, in this embodiment, the external prestressed tendons 1 are tensioned by adopting a variable angle tensioning mode, one side of the tensioning end structure 2 is sequentially provided with a variable angle steering device 9 and a tensioning jack 10, and the external prestressed tendons 1 are pulled out and then tensioned by arranging the variable angle steering device 9.
Preferably, in the external prestress reinforced concrete frame beam structure, the annular anchorage device comprises an anchor plate 21 with the same number and opposite taper holes and matched clamping pieces arranged in the taper holes, so that the threading and tensioning of the external prestress tendons 1 in two groups in opposite directions can be realized. During construction, only one group of external prestressed tendons 1 in the tensioning end structure 2 is tensioned, in the tensioning process, along with the continuous increase of the tensile force and the elongation of the group of external prestressed tendons 1, the annular anchor device moves gradually towards the reverse direction of the tensile force, so that the tensioning of the other group of external prestressed tendons 1 is driven by phase change, namely the other group of external prestressed tendons 1 is tensioned, when the tensile force reaches a design value and the tensile forces of the two groups of external prestressed tendons 1 in opposite directions acting on the annular anchor device are equal, the annular anchor device is stressed to balance and does not move any more, anchoring is carried out, and tensioning is finished.
In order to make the external prestress uniformly act on the frame beam 5, preferably, in the external prestress reinforced concrete frame beam structure, each group of external prestress ribs 1 is divided into two bundles of prestress ribs, the two bundles of prestress ribs are arranged on two sides of the frame beam 5, the fixed end structure 3 is symmetrically arranged on two sides of the frame beam 5, steering through holes on the frame column 6 are symmetrically arranged on two sides of the frame beam 5, one ends of the two bundles of prestress ribs are converged and pass through the tensioning end structure 2 after being steered by the steering device 4, the other ends of the two bundles of prestress ribs are respectively anchored on the corresponding fixed end structures 3 on two sides of the frame beam 5 after being steered by the steering device 4 or respectively pass through the frame column between adjacent frame beams 5 and the beam 11 perpendicular to the frame beam after being steered by the steering device 4 and pass through the tensioning end structure 2 of the adjacent frame beam 5.
Preferably, in the external prestress reinforced concrete frame beam structure, one external prestress rib 1 of the two groups of external prestress ribs 1 penetrates through the middle of the anchor plate 21 and is used as a prestress rib which stretches in advance, and the other group of external prestress ribs 1 penetrates through the outer area of the anchor plate 21. The pre-tensioned external prestressed tendons 1 are arranged in the middle of the anchor plate 21, so that the tensioned external prestressed tendons 1 can be concentrated as much as possible, and the structures of the variable-angle steering device 9 and the tensioning jack 10 are more compact. Specifically, in the external prestress reinforced concrete frame beam structure of the embodiment, each external prestress rib 1 comprises two external prestress ribs 1, four external prestress ribs 1 of the same group penetrating through the middle of the anchor plate 21 are distributed on the top of a square, four external prestress ribs 1 of the other group penetrating through the outer area of the anchor plate 21 are distributed on the top of a rectangle, the square coincides with the center of the rectangle and the side lines are parallel, and the square is located in the rectangle.
Preferably, in the external prestress reinforced concrete frame beam structure, the fixed end structure 3 is positioned above the neutral axis of the cross section of the frame beam 5 so as to improve the stress effect of the external prestress rib 1.
Preferably, in the external prestress reinforcement concrete frame beam structure, the fixed end structure comprises a bearing plate 31, an extrusion anchor 32 and an inclined support plate 34, the bearing plate 31 is fixedly connected with the frame beam 5 through a fixed end steel member 33, the lower end of the inclined support plate 34 is welded with the fixed end steel member 33, the upper end of the inclined support plate is welded with the bearing plate 31, the external prestress rib 1 sequentially passes through the inclined support plate 34 and the bearing plate 31 and then is anchored in the extrusion anchor 32, the extrusion anchor 32 is a sleeve sleeved at the end part of the prestress rib, and is extruded by a special extrusion machine, so that the prestress rib is gripped after plastic deformation is generated by the extrusion sleeve, and through holes which are used for the external prestress rib 1 to pass through and are respectively formed in the bearing plate and are positioned at the same horizontal height. By arranging the inclined support plate 34, the stability of the bearing plate can be improved, and the external prestressed tendons 1 can be in a horizontal state before being anchored into the extrusion anchor, so that the anchoring effect is improved.
Preferably, in the external prestress reinforced concrete frame beam structure, the external prestress rib 1 adopts unbonded steel strands or epoxy coating steel strands.
Preferably, in the structure of the external prestress reinforced concrete frame beam, a transverse through hole is formed in the frame column 6 between the adjacent frame beams 5 and the beam 11 perpendicular to the frame beams, a sleeve 7 is arranged in the transverse through hole, two end faces of the sleeve 7 are flush with two side faces of the beam 11 perpendicular to the frame beams, two ends of the sleeve 7 are respectively provided with a steering block 8, the steering blocks 8 are respectively fixed on the frame column 6 between the adjacent frame beams 5, the sleeve 7 is provided with a through sleeve through hole 71, the steering block 8 is provided with a through steering block through hole 81, the bottom of the steering block through hole 81 is gradually reduced from a direction close to the sleeve 7 and away from the side of the sleeve 7, and the sleeve through hole 71 and the two steering block through holes 81 are combined to form the steering through hole.
With continued reference to fig. 1 to 6, the invention also discloses a construction method for the in vitro prestress reinforced concrete frame beam structure, which comprises the following steps:
firstly, carrying out external prestress reinforcement design on a frame beam 5 according to known load conditions, and determining the dosage of external prestress ribs 1;
step two, blanking the external prestressed tendons 1, and processing and manufacturing the fixed end structure 3 and the steering device 4;
step three, positioning and mounting of the fixed end structure 3 and the steering device 4: firstly polishing and cleaning the surface for butt joint between the fixed end structure 3 and the frame beam 5 and the surface for butt joint between the steering device 4 and the frame beam 5, then respectively fixing the fixed end structure 3 and the steering device 4 on the frame beam 5 by using structural adhesive and using an anchor bolt, and filling and compacting gaps between the fixed end steel member 33 and the frame beam 5 by using epoxy mortar or non-shrinkage mortar;
step four, the external prestressed tendons 1 are penetrated and installed, each group of external prestressed tendons 1 is divided into two bundles of prestressed tendons, the two bundles of prestressed tendons are arranged on two sides of a frame beam 5, one ends of the two bundles of prestressed tendons are converged and penetrated into a tensioning end structure 2 after being turned by a turning device 4, the other ends of the two bundles of prestressed tendons are respectively anchored on corresponding fixed end structures 3 on two sides of the frame beam 5 after being turned by the turning device 4 or respectively penetrated through frame columns between adjacent frame beams 5 after being turned by the turning device 4 and penetrated into the tensioning end structure 2 of the adjacent frame beam 5 after being penetrated through beams 11 perpendicular to the frame beams;
installing an annular anchor at a tensioning end and tensioning the prestressed tendons, wherein the external prestressed tendons 1 are tensioned by adopting a variable angle tensioning process, the tensioning is mainly controlled by a tensioning force, the deviation between an actually measured extension value and a calculated extension value is not more than +/-6%, only one group of external prestressed tendons 1 is tensioned during construction, the annular anchor moves gradually towards the opposite direction of the tensioning force along with the continuous increase of the extension of the tensioning force and the external prestressed tendons 1 in the tensioning process, so that the annular anchor is phase-changed to drive the tensioning of the other group of external prestressed tendons 1, and when the tensioning forces of the two groups of external prestressed tendons 1 in different directions reach the design values, the stress of the annular anchor is balanced and does not move any more, and the anchoring is carried out;
and step six, after the external prestressed reinforcement 1 is tensioned, protecting the external prestressed reinforcement 1, the tensioning end structure 2, the fixed end structure 3 and the steering device 4, so as to ensure the normal use performance and durability of the external prestressed reinforcement system.
In summary, according to the external prestress reinforced concrete frame beam structure and the construction method thereof provided by the invention, only one tensioning end structure 2 is arranged at the middle Liang Dexia side of each span frame beam 5, and the tensioning end structure 2 adopts an annular anchorage device to lap and tension two groups of external prestress ribs 1, so that the number of the tensioning end structures 2 is effectively reduced, and the structure of the tensioning end structure 2 is simplified. In addition, the tensioning end structure 2 is arranged below the bottom of each span of frame beam 5, so that the space above the floor plate or roof plate is not occupied, the using function of the building is not affected, holes are not required to be formed in the floor plate or roof plate, and the using function of the building and the waterproof system of the floor plate or roof are not affected. Furthermore, the tensioning end structure 2 is arranged below the bottom of each span of frame beam 5, so that the space above the floor or roof board is not occupied, and the operation length required by tensioning can be reserved for the external prestressed tendons, so that the prestressed tendons can be subjected to tensioning or replacement when the prestressed tendons are loosened during use. In addition, the external prestressed tendons can be arranged in multi-span continuous mode, and the reinforcement efficiency is high.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (10)
1. The utility model provides an external prestressing force consolidates concrete frame beam structure, its characterized in that includes two sets of external prestressing tendons, stretch-draw end structure, fixed end structure and turns to the device, stretch-draw end structure is located the middle part roof beam below of every frame roof beam that strides, stretch-draw end structure adopts annular ground tackle to overlap and stretch-draw two sets of external prestressing tendons, the one end of two sets of external prestressing tendons wears to locate in the stretch-draw end structure from opposite direction respectively, the other end of two sets of external prestressing tendons is anchored respectively on the fixed end structure or wears to locate in the stretch-draw end structure that is located the middle part roof beam below of adjacent frame roof beam behind the roof beam that strides the frame post and the beam that is perpendicular to the frame roof beam, every external prestressing tendons of set up in the frame roof beam bottom of stretch-draw end structure and fixed end structure or set up the frame roof beam bottom of stretching to between the through-hole that turns to of frame roof beam.
2. The in vitro prestressed reinforced concrete frame beam structure of claim 1, wherein said in vitro prestressed tendons are made of unbonded steel strands or epoxy coated steel strands.
3. The external prestress reinforced concrete frame beam structure of claim 1, wherein the external prestress rib is tensioned in a variable angle tensioning mode, and one side of the tensioning end structure is sequentially provided with a variable angle steering device and a tensioning jack.
4. The external prestress reinforced concrete frame beam structure of claim 1, wherein the annular anchorage comprises an anchor plate with the same number but opposite taper holes and matched clamping pieces arranged in the taper holes, and can realize the threading and tensioning of two groups of external prestress tendons with opposite directions.
5. The external prestressed reinforced concrete frame girder structure of claim 1, wherein one of the two sets of external tendons is penetrated through the middle of the anchor plate and serves as a pre-tensioned tendon, and the other set of external tendons is penetrated through the outer region of the anchor plate.
6. The in vitro prestressed reinforced concrete frame girder construction of claim 1, wherein the fixed end structure is located above the neutral axis of the cross section of the frame girder.
7. The external prestress reinforced concrete frame beam structure of claim 1, wherein each group of external prestress ribs is divided into two prestress ribs, the two prestress ribs are arranged on two sides of the frame beam, one ends of the two prestress ribs are converged after passing through the steering device and pass through the tensioning end structure, the other ends of the two prestress ribs are respectively anchored on corresponding fixed end structures on two sides of the frame beam after being steered through the steering device or respectively pass through frame columns between adjacent frame beams after being steered through the steering device and pass through the tensioning end structure of the adjacent frame beam after being perpendicular to the frame beams.
8. The external prestressed reinforced concrete frame beam structure of claim 7, wherein each external tendon includes two external tendons, four external tendons of the same group penetrating through the middle of the anchor plate are distributed on the top of a square, four external tendons of another group penetrating through the outer area of the anchor plate are distributed on the top of a rectangle, the square coincides with the center of the rectangle and the side lines are parallel, and the square is located inside the rectangle.
9. The in-vitro prestressed reinforced concrete frame beam structure of claim 1, wherein a transverse through hole is formed in a beam which is perpendicular to the frame beams and is positioned at a frame column between adjacent frame beams, sleeves are arranged in the through holes, two end faces of each sleeve are flush with two side faces of the beam perpendicular to the frame beams, steering blocks are respectively arranged at two ends of each sleeve and are respectively fixed on the frame column between the adjacent frame beams, each sleeve is provided with a through sleeve through hole, each steering block is provided with a through steering block through hole, the bottoms of the steering block through holes gradually decrease from the direction close to the sleeve side to the direction away from the sleeve side, and the sleeve through holes and the two steering block through holes are combined to form a steering through hole.
10. A method of constructing an in vitro prestressed reinforced concrete frame girder construction according to any one of claims 1 to 9, comprising the steps of:
step one, carrying out external prestress reinforcement design on a frame beam according to known load conditions, and determining the dosage of external prestress tendons;
step two, blanking the external prestressed tendons, and processing and manufacturing a fixed end structure and a steering device;
step three, positioning and mounting a fixed end component and a steering device: firstly polishing and cleaning the surface for butt joint between the fixed end structure and the frame beam and the surface for butt joint between the steering device and the frame beam, then respectively fixing the fixed end structure and the steering device on the frame beam by using structural adhesive and using an anchor bolt, and filling and compacting gaps between the fixed end steel member and the frame beam by using epoxy mortar or shrinkage-free mortar;
step four, in-vitro prestress rib beam penetration and installation;
installing an annular anchor at a tensioning end and tensioning the prestressed tendons, wherein the external prestressed tendons are tensioned by adopting a variable angle tensioning process, the tensioning is mainly controlled by a tensioning force, the deviation between an actually measured extension value and a calculated extension value is not more than +/-6%, only one group of external prestressed tendons is tensioned during construction, the annular anchor moves towards the reverse direction of the tensioning force gradually along with the continuous increase of the stretching force of the tensioning force and the external prestressed tendons in the tensioning process, so that the tensioning of the other group of external prestressed tendons is driven by the phase change, and when the tensioning forces of the two groups of external prestressed tendons in different directions reach a design value, the stress of the annular anchor is balanced and does not move any more, the anchoring is carried out, and the tensioning is finished;
and step six, after the external prestressed tendons are tensioned, protecting the external prestressed tendons, the tensioning end structure, the fixed end structure and the steering device.
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| CN114562070B (en) * | 2022-03-19 | 2023-08-08 | 池州建投鼎晟预制构件有限公司 | Bearing capacity resistant structure of prestressed concrete beam |
| CN117005544B (en) * | 2023-10-07 | 2023-12-15 | 中国船舶集团国际工程有限公司 | Self-sensing bidirectional prestress regulation and control system of large-span truss, large-span truss and installation method |
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