CN115538697A - Large-span slow-bonding prestressed reinforced concrete structural beam - Google Patents
Large-span slow-bonding prestressed reinforced concrete structural beam Download PDFInfo
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- CN115538697A CN115538697A CN202211289647.1A CN202211289647A CN115538697A CN 115538697 A CN115538697 A CN 115538697A CN 202211289647 A CN202211289647 A CN 202211289647A CN 115538697 A CN115538697 A CN 115538697A
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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
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
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Abstract
The invention discloses a large-span slow-bonding prestressed reinforced concrete structural beam which is a slow-bonding prestressed concrete structure and comprises a large-span slow-bonding prestressed beam and a prestressed reinforcement auxiliary positioning device, wherein the large-span slow-bonding prestressed beam comprises a frame beam and a frame column, slow-bonding prestressed reinforcements are inserted in the frame beam in a penetrating manner, the slow-bonding prestressed reinforcements comprise steel strands, slow-bonding adhesives and a PE (polyethylene) sheath, beam reinforcements playing a stress role are arranged in the frame beam, the beam reinforcements comprise longitudinal reinforcements and stirrups, the longitudinal reinforcements and the stirrups are connected to form a reinforcement cage of the frame beam, and the prestressed reinforcement auxiliary positioning device is fixedly arranged below the longitudinal reinforcements and used for adjusting the distance between the slow-bonding prestressed reinforcements and the upper end surface or the lower end surface of the frame beam. The invention provides a reliable design scheme for vast design and construction practitioners by providing design parameters, design structures and related material characteristic choices required by the slow bonding prestressed reinforcement large-span beam with the length of 21-24 meters.
Description
Technical Field
The invention relates to the technical field of frame beam design, in particular to a large-span slow-bonding prestressed reinforced concrete structural beam.
Background
According to the regulations of earthquake resistance design specification (called anti-specification for short), the large-span frame refers to a frame with the span of not less than 18 meters, wherein the frame beams and the frame columns which form the frame are involved, and the frame beams applied to the large-span frame can also be called large-span beams. The design requirements of the large-span beams with different lengths are different, and the structural design, material selection and material use and the construction method are different and cannot be summarized.
The design scheme of the large-span beam is various, for example, the patent document in China discloses a large-diameter slow bonding prestressed reinforcement structure, the publication number of which is CN216584351U, the publication date of which is 2022, 05 and 24 months, and the patent discloses that slow bonding prestressed reinforcements are inserted into a frame beam to offset the positive bending moment of the frame beam in use, so that the frame structure is prevented from cracking, and the stability of the whole structure is improved. However, the length of the beam to which the data presented therein is matched is not indicated in this patent document, so the technical means in this document are not applicable to large-span beams of different lengths.
It is known that the calculation of the structural design, material usage and construction method of a large span beam not only needs to meet relevant standards, but also involves a large amount of engineering experience and selection of algorithm core parameters, which are often regarded as commercial secrets without disclosure. According to research and search, the design parameters and the design structure required by the slow-bonding prestressed reinforcement large-span beam with the length of 21-24 meters are not disclosed in the prior art.
Meanwhile, due to the characteristic of large span, the arrangement of the slow bonding prestressed reinforcement in the beam avoids binding intensive reinforcement and controls the height of a key position, so that bending is inevitable, and a device capable of accurately positioning the prestressed reinforcement in the slow bonding prestressed beam is also needed.
For example, in the case of a large-span slow-bonding prestressed reinforced concrete beam and a construction method disclosed in chinese patent literature, the publication number is CN112832512B, and the publication date is 2022, 05, 27 days, the publication date also discloses a large-span beam structure using slow-bonding prestressed reinforcements as a foundation, and the publication discloses a structure for positioning prestressed reinforcements, but the structure is bundled by steel wires when fixing the slow-bonding prestressed reinforcements, the steel wires need to be removed again when the prestressed reinforcements need to be adjusted in the construction process, the bundling is time-consuming and labor-consuming, and after the prestressed reinforcements are laid, the slow-bonding prestressed reinforcements need to be moved when adjusting the length and height, the pipe sleeves outside the prestressed reinforcements are bundled by the steel wires and cannot be moved, and the pipe sleeves can be even damaged if the prestressed reinforcements are moved forcibly.
Therefore, an auxiliary structure capable of accurately positioning the slow bonding prestressed steel bars is required to be designed in the structural design of the slow bonding prestressed steel bar large-span beam, so that the prestressed steel bars are convenient to position and adjust.
Disclosure of Invention
The invention aims to provide a large-span slow-bonding prestressed reinforced concrete structural beam, which is specially used for solving the design structure problem of a slow-bonding prestressed reinforced concrete large-span beam of 21-24 meters in the background art, and simultaneously provides an auxiliary structure capable of accurately positioning the slow-bonding prestressed reinforced concrete so as to realize the design structure of the slow-bonding prestressed reinforced concrete large-span beam.
The technical scheme of the invention is realized as follows:
a large-span slow-bonding prestressed reinforced concrete structural beam is a slow-bonding prestressed concrete structure and comprises a large-span slow-bonding prestressed beam and a prestressed reinforcement auxiliary positioning device, wherein the large-span slow-bonding prestressed beam comprises a frame beam and a frame column, slow-bonding prestressed reinforcements are inserted in the frame beam and comprise steel strands, a slow-bonding adhesive and a PE (polyethylene) sheath, beam reinforcements for bearing force are arranged in the frame beam and comprise longitudinal reinforcements and stirrups which are connected to form a reinforcement cage of the frame beam, the prestressed reinforcement auxiliary positioning device is fixedly arranged below the longitudinal reinforcements and used for adjusting the distance between the slow-bonding prestressed reinforcements and the upper end surface or the lower end surface of the frame beam, and the slow-bonding prestressed reinforcements extend out of two ends of the frame beam, the method is characterized in that a tension end and an anchoring end are respectively arranged in the side walls of two ends of a frame beam, the diameter of each steel strand is not less than 21.8mm, the ultimate strength standard value fptk of each steel strand is not less than 1860MPa, the design value fpy of the tensile strength is not less than 1320MPa, the design value f' py = =390MPa, the maximum force total elongation is not less than 3.5%, the weight of each meter of the slow-bonded prestressed steel bar is 2.9-3.0 kg, the rib height of the slow-bonded prestressed steel bar is not less than 2.0mm, the depth of a rib groove is not less than 1.8mm, the standard tensioning application period of the slow-bonded adhesive is not less than 120 days, the standard curing time is not more than 360 days, the slow-bonded prestressed steel bar is arranged in a secondary parabola shape, and the distance L1 between two frame columns is 21000-24000 mm;
the length L2 of the frame beam extending out of the frame column is 5000 mm-6000 mm;
the height H1 of the frame beam between the two frame columns is 1780-1820 mm;
the height H2 of the frame beam extending out of the frame column is 1080-1120 mm;
the vertical distance H3 from the slow bonding prestressed reinforcement at the tensioning end and the anchoring end to the upper end face of the frame beam is 280-320 mm;
the vertical distance H4 from the slow bonding prestressed reinforcement right above the center of the frame column to the upper end face of the frame beam is 130-170 mm;
the vertical distance H5 from the slow bonding prestressed reinforcement extending to the middle point of the length of the frame beam outside the frame column to the upper end face of the frame beam is 230-270 mm;
and the vertical distance H6 from the lowest point of the slow bonding prestressed reinforcement between the two frame columns to the lower end face of the frame beam is 130-170 mm.
Further technical scheme is, stretch-draw is served and is included first bearing plate, indirect reinforcing bar, cave mould and clip formula haplopore ground tackle, first bearing plate sets up in the frame roof beam, indirect reinforcing bar is installed to the inboard of first bearing plate, be equipped with cylindricality cave mould on the frame roof beam lateral wall in the first bearing plate outside, install clip formula haplopore ground tackle on the first bearing plate, clip formula haplopore ground tackle includes anchor ring and clamping piece, the anchor ring passes through cave indent mould frame roof beam in, slowly bond prestressed reinforcement and pass the muscle hole in the anchor ring and be equipped with the clamping piece in the muscle hole of anchor ring.
The further technical scheme is that the anchor end comprises a second bearing plate, indirect reinforcing steel bars and an extrusion type anchorage device, the second bearing plate is arranged in the frame beam, the indirect reinforcing steel bars are installed on the inner side of the second bearing plate, the extrusion type anchorage device is installed on the outer side of the second bearing plate, the slow bonding prestressed reinforcing steel bars are clamped by the extrusion type anchorage device, and the end portions of the slow bonding prestressed reinforcing steel bars at the anchor end adopt sealing measures.
The further technical proposal is that the efficiency coefficient of the clamping piece type single-hole anchorage device and the extrusion type anchorage device is not less than 0.95.
The concrete for pouring the frame beam and the frame column has the concrete strength grade not lower than C40, and the total content of chloride ions in the concrete of the frame beam is not more than 0.06 percent in percentage of the total amount of the gel material.
The prestressed reinforcement auxiliary positioning device comprises two fixing plates and extension plates fixedly arranged below each fixing plate, a first rotating shaft is further arranged between the two extension plates, a plurality of jacks are formed in the fixing plates, the fixing plates are arranged below longitudinal ribs at the tops of beam reinforcements, steel wires penetrate through the jacks to bind the fixing plates on the longitudinal ribs, a first sleeve is further sleeved on the first rotating shaft, the first sleeve rotates and slides on the first rotating shaft, at least one first threaded hole is formed in the first sleeve, a first bolt is screwed in the first threaded hole and abuts against the first rotating shaft after being screwed, a second sleeve is further arranged on the first sleeve, the second sleeve is further fixedly arranged on the side wall of the first sleeve, a second rotating shaft is further rotatably and slidably inserted in the second sleeve, at least one second threaded hole is formed in the second sleeve, a second bolt is screwed in the second threaded hole and abuts against the second rotating shaft after being screwed, a third sleeve is further arranged at the tail end of the second rotating shaft, the side wall of the third sleeve is vertically fixed at the tail end of the second rotating shaft, a third slide bar is further inserted in the third sliding sleeve, a slide bar is further inserted in the third slide bar, a clamping mechanism is slidably inserted in the third slide bar, and a clamping mechanism is further arranged on the third slide bar, and a clamping mechanism.
The further technical scheme is that the sliding clamping mechanism comprises a support and a sliding clamping piece rotatably mounted on the support.
The support comprises a fourth sleeve and two support plates, internal threads are arranged on the inner wall of the fourth sleeve, the fourth sleeve is connected to the external threads of the sliding rod in a threaded mode through the internal threads, the two support plates are fixedly arranged at two ends of the side wall of the fourth sleeve respectively, round holes penetrating through the two support plates simultaneously are formed in the two support plates, and the sliding clamp is rotatably installed in the round holes.
A further technical scheme is that, the slip folder includes folder cage and cylinder, the folder cage includes roof and the bottom plate of rectangle, both ends below is equipped with the lug respectively about the roof, still be equipped with three piece at least equidistance interval distribution's round axle between two upper lugs, both ends top still is equipped with down the lug respectively about the bottom plate, still be equipped with three piece at least equidistance interval distribution's round axle between two lower lugs, lug and bottom plate left end lower lug pass through three piece at least equidistance interval distribution's round axle fixed connection, the through-hole of three at least equidistance interval distribution is still seted up to the lug on the roof right-hand member, corresponding screw shaft hole has still been seted up to the position of the relative through-hole of lug under the bottom plate right-hand member, still wear to be equipped with the axostylus axostyle in through-hole and the screw shaft hole simultaneously, the lower extreme of axostylus axostyle is equipped with the external screw thread, the axostylus axostyle rotates the back spiro union from the through-hole top and passes in the screw shaft hole below, the cylinder rotates the round off-axis, the cover is established outside the axostylus axostyle, the cylinder rotates the cover and is established outside the axostylus axostyle under the axostylus axostyle, the bottom of roof still is equipped with the stopper, the top surface of roof still is equipped with the stopper, the stopper still on the top bottom surface of upper spindle, the top surface of upper spindle, the bottom of upper spindle. The sliding clamp is rotatably arranged in the round hole of the supporting plate through the upper rotating shaft and the lower rotating shaft.
The invention has the beneficial effects that:
1. by providing design parameters, design structures and related material characteristic selection required by the slow bonding prestressed reinforcement large-span beam with the length of 21-24 meters, a reliable design scheme is provided for vast design and construction practitioners.
2. Through setting up prestressing steel bar assistance-localization real-time device for can pinpoint more and convenient adjustment when laying slow bonding prestressing steel, make the project organization of large-span slow bonding prestressing reinforced concrete structure roof beam realize more easily.
3. Through setting up first sleeve, second sleeve, third sleeve and the fourth sleeve that realizes multidimension degree regulation through the compound mode for the required installation accuracy of installation prestressing steel auxiliary positioning device reduces, and the fault-tolerant rate is higher, and construction speed is faster.
4. Through setting up slip fixture for prestressing steel auxiliary positioning device catches prestressing steel more easily, and can effectively prevent PE sheath damage during the adjustment prestressing steel.
Drawings
FIG. 1 is a schematic view of the arrangement of retarded adhesive prestressed reinforcement bars in a frame beam;
FIG. 2 is a cross-sectional view of the internal structure of the retarded adhesive prestressed reinforcement;
FIG. 3 is a schematic structural view of a tension end;
FIG. 4 is a schematic view of the anchoring end;
FIG. 5 is a perspective partial structure view of the assembly of the prestressed reinforcement auxiliary positioning device and the beam reinforcement;
FIG. 6 is a general structure diagram of an assembly plane of the prestressed reinforcement auxiliary positioning device and the beam reinforcement;
FIG. 7 is a perspective view of the structure;
FIG. 8 is a schematic view of the auxiliary positioning device for prestressed reinforcement with parts disassembled;
FIG. 9 is a perspective view of the slide clamp mechanism;
FIG. 10 is a front view of the slide clamp mechanism;
FIG. 11 is an exploded view of the bracket and clip cage;
fig. 12 is an exploded view of the gripper cage with the roller removed.
In the figure, 1, a frame column, 2, a frame beam, 3, a prestressed steel bar, 4, a steel strand, 5, a slow bonding adhesive, 6, a PE sheath, 7, a hole die, 8, an anchor ring, 9, a first bearing plate, 10, an indirect steel bar, 11, a squeezing type anchorage device, 12, a second bearing plate, 13, a stirrup, 14, a longitudinal bar, 15, an auxiliary positioning device, 16, a fixing plate, 17, a jack, 18, an extension plate, 19, a first rotating shaft, 20, a first threaded hole, 21, a first bolt, 22, a first sleeve, 23 and a second sleeve, 24, a second bolt, 25, a second threaded hole, 26, a second rotating shaft, 27, a third sleeve, 28, a third threaded hole, 29, a third bolt, 30, a sliding rod, 31, a sliding clamping mechanism, 32, a fourth sleeve, 33, a supporting plate, 34, a reinforcing rib, 35, a sliding clamping piece, 36, a round hole, 37, a top plate, 38, a limiting block, 39, an upper rotating shaft, 40, an upper convex block, 41, a bottom plate, 42, a lower rotating shaft, 43, a roller, 44, a lower convex block, 45, a round shaft, 46, a through hole, 47, a threaded shaft hole, 48 and a shaft rod.
Detailed Description
For a better understanding of the technical content of the present invention, the following detailed description is provided in conjunction with the accompanying drawings for further explanation of the present invention.
Referring to fig. 1 to 12, a large-span slow-bonding prestressed reinforced concrete structural beam is a slow-bonding prestressed reinforced concrete structure, and includes a large-span slow-bonding prestressed beam and a prestressed reinforcement auxiliary positioning device 15, the large-span slow-bonding prestressed beam includes a frame beam 2 and a frame column 1, the frame beam 2 is arranged above the frame column 1, a slow-bonding prestressed reinforcement 3 is inserted into the frame beam 2, a beam reinforcement and a column reinforcement which are used for bearing force are respectively arranged in the frame beam 2 and the frame column 1, the structures of the column reinforcement and the beam reinforcement are common, no improvement exists in the present invention, the column reinforcement structure is not described in detail here, for the convenience of the description of the subsequent schemes, the constituent components of the beam reinforcement are simply described, the beam reinforcement includes a longitudinal reinforcement 14 and a hoop reinforcement 13, and the longitudinal reinforcement 14 and the hoop reinforcement 13 are connected to form a reinforcement cage of the frame beam 2.
Specifically, the retard-bonded prestressed reinforcement 3 is composed of a steel strand 4, a retard-bonded adhesive 5 and a PE sheath 6, wherein the surface of the PE sheath 6 has uneven indentations, and the high-strength low-relaxation steel strand 4 with a diameter of 21.8mm is the steel strand 4 (the definition of high-strength low-relaxation is referred to as "high-strength low-relaxation prestressed hot-dip galvanized steel strand 4 (YB/T152-1999)"). The ultimate strength standard value fptk =1860MPa, the tensile strength design value fpy =1320MPa, the compressive strength design value f' py =390MPa, the maximum force total elongation is not less than 3.5%, the weight of each meter of the slow bonding prestressed steel 3 is 2.9-3.0 kg, the rib height of the slow bonding prestressed steel 3 with the specification of 21.8mm is not less than 2.0mm, and the rib groove depth is not less than 1.8mm. The slow bonding adhesive 5 in the rib needs to be filled, the standard tensioning working life of the slow bonding adhesive 5 is not less than 120 days, the standard curing time is not more than 360 days, and the slow bonding prestressed reinforcement 3 is tensioned in the tensioning working life.
The slow bonding prestressed reinforcement 3 extends out of two ends of the frame beam 2, and a tension end and an anchoring end are respectively arranged in the side walls of the two ends of the frame beam 2. Be equipped with first bearing plate 9 on slow bonding prestressed reinforcement 3's the stretch-draw end, first bearing plate 9 sets up in frame roof beam 2, indirect reinforcing bar 10 is installed to the inboard (towards one side in the middle of frame roof beam 2) of first bearing plate 9, be equipped with cylindricality cave mould 7 on the frame roof beam 2 lateral wall in the first bearing plate 9 outside, install the single-hole ground tackle of clip formula on the first bearing plate 9, the single-hole ground tackle of clip formula includes anchor ring 8 and clamping piece, anchor ring 8 passes through cave mould 7 indent frame roof beam 2 in, slow bonding prestressed reinforcement 3 passes the muscle hole in anchor ring 8 and is equipped with the clamping piece in anchor ring 8's muscle hole. Slowly bond and be equipped with second bearing plate 12 on prestressed reinforcement 3's the anchor end, second bearing plate 12 sets up in frame roof beam 2, and indirect reinforcing bar 10 is installed to the inboard of second bearing plate 12, and extrusion formula ground tackle 11 is installed in the outside of second bearing plate 12, slowly bonds prestressed reinforcement 3 and is pressed from both sides tightly by extrusion formula ground tackle 11, slowly bonds prestressed reinforcement 3 and adopts sealing means at the tip of anchor end.
Specifically, the anchor efficiency coefficient is not less than 0.95.
Specifically, the fatigue anchoring performance of the slow-bonding prestressed reinforcement 3 anchorage device assembly should meet the following requirements: the upper limit of the test stress is 65% of the limit value fptk of the prestressed reinforcement 3, the fatigue stress amplitude is not less than 80N/mm < 2 >, and the cycle number is not less than 200 ten thousand times of required fatigue performance tests.
The slow bonding prestressed reinforcement 3 is arranged in a secondary parabola shape;
the distance L1 between the two frame columns 1 is 21000-24000 mm;
the length L2 of the frame beam 2 extending out of the frame column 1 is 5000 mm-6000 mm;
the height H1 of the frame beam 2 between the two frame columns 1 is 1780-1820 mm;
the height H2 of the frame beam 2 extending out of the frame column 1 is 1080-1120 mm;
the vertical distance H3 from the slow bonding prestressed reinforcement 3 at the tensioning end and the anchoring end to the upper end face of the frame beam 2 is 280-320 mm;
the vertical distance H4 from the slow bonding prestressed reinforcement 3 right above the center of the frame column 1 to the upper end face of the frame beam 2 is 130-170 mm;
the vertical distance H5 from the slow bonding prestressed reinforcement 3 at the middle point of the length of the frame beam 2 extending out of the frame column 1 to the upper end surface of the frame beam 2 is 230-270 mm;
the vertical distance H6 from the lowest point (namely the lowest point of a parabola) of the slow bonding prestressed reinforcement 3 between the two frame columns 1 to the lower end surface of the frame beam 2 is 130-170 mm;
the slow-bonding prestressed reinforcement 3 can be tensioned after the concrete strength reaches 80% of the design strength, the tensioning stress is 1395MPa, the method for measuring the elongation value is adopted for checking, and the stress support system at the bottom of the frame beam 2 cannot be detached before tensioning. And after tensioning is finished, cutting off the excessive length of the retard-bonded prestressed reinforcement 3, smearing the clamping pieces and the end head of the retard-bonded prestressed reinforcement 3 with anticorrosive grease or epoxy resin, and finally sealing with micro-expansion fine aggregate concrete.
Specifically, the concrete strength grade of concrete for pouring the frame beam 2 and the frame column 1 is not lower than C40. The concrete of the slow-bonding prestressed concrete member must not be doped with chloride, and in the concrete or mortar composition materials including the additive, the total content of chloride ions in percentage of the total amount of gel materials should not exceed 0.06%.
The prestressed reinforcement auxiliary positioning device 15 comprises two fixing plates 16 and extension plates 18 fixedly arranged below each fixing plate 16, a first rotating shaft 19 is welded between the two extension plates 18, a plurality of insertion holes 17 are formed in the fixing plates 16, the fixing plates 16 are arranged below longitudinal reinforcements 14 at the tops of beam reinforcements, and steel wires penetrate through the insertion holes 17 to bind the fixing plates 16 to the longitudinal reinforcements 14. The first shaft 19 is further sleeved with a first sleeve 22, and the first sleeve 22 rotates and slides on the first shaft 19. Two first threaded holes 20 are formed in the first sleeve 22, a first bolt 21 is screwed in the first threaded hole 20, and the first bolt 21 presses the first rotating shaft 19 tightly by screwing the first bolt 21 so that the first sleeve 22 is fixed on the first rotating shaft 19. The first sleeve 22 is further provided with a second sleeve 23, the second sleeve 23 is vertically fixedly welded on the side wall of the first sleeve 22, and the extension plate 18 enables the first rotating shaft 19 to be far away from the upper longitudinal rib 14, so that space required by rotation is provided for the first sleeve 22 and the second sleeve 23.
A second rotating shaft 26 is further inserted into the second sleeve 23, the second rotating shaft 26 is slidably and rotatably inserted into the second sleeve 23, two second threaded holes 25 are formed in the second sleeve 23, a second bolt 24 is screwed into the second threaded holes 25, and the second bolt 24 tightly presses the second rotating shaft 26 by screwing the second bolt 24, so that the second rotating shaft 26 is fixed in the second sleeve 23.
The end of the second rotating shaft 26 is further provided with a third sleeve 27, the side wall of the third sleeve 27 is vertically fixedly welded at the end of the second rotating shaft 26, a sliding rod 30 is inserted in the third sleeve 27 in a sliding manner, the third sleeve 27 is provided with two third threaded holes 28, a third bolt 29 is screwed in the third threaded holes 28, and the sliding rod 30 is fixed in the third sleeve 27 by tightening the third bolt 29 and pressing the sliding rod 30 by the third bolt 29.
The sliding rod 30 is provided with an external thread and a sliding clamping mechanism 31, and the sliding clamping mechanism 31 is screwed on the external thread of the sliding rod 30.
The sliding clamping mechanism 31 comprises a support and a sliding clamping piece 35 which is rotatably installed on the support, the support comprises a fourth sleeve 32 and two supporting plates 33, the inner wall of the fourth sleeve 32 is provided with an internal thread, the fourth sleeve 32 is connected to the external thread of the sliding rod 30 through the internal thread in a threaded manner, the two supporting plates 33 are respectively welded at two ends of the side wall of the fourth sleeve 32, reinforcing ribs 34 are welded at the joint of the side walls of the supporting plates 33 and the fourth sleeve 32, two supporting plates 33 are provided with round holes 36 which simultaneously penetrate through the two supporting plates 33, and the sliding clamping piece 35 is rotatably installed in the round holes 36.
The sliding clamping piece 35 comprises a clamping piece cage and a roller 43, the clamping piece cage comprises a rectangular top plate 37 and a rectangular bottom plate 41, upper protrusions 40 are arranged below the left end and the right end of the top plate 37 respectively, a plurality of circular shafts 45 which are distributed at equal intervals are arranged between the two upper protrusions 40, lower protrusions 44 are arranged above the left end and the right end of the bottom plate 41 respectively, a plurality of circular shafts 45 which are distributed at equal intervals are arranged between the two lower protrusions 44, the upper protrusions 40 at the left end of the top plate 37 and the lower protrusions 44 at the left end of the bottom plate 41 are connected through the circular shafts 45 which are distributed at equal intervals in a welded mode, through holes 46 which are formed in the positions, opposite to the through holes 46, of the lower protrusions 44 at the right end of the bottom plate 41 are provided with threaded shaft holes 47, shaft rods 48 simultaneously penetrate through the through holes 46 and the threaded shaft holes 47, external threads are arranged at the lower ends of the shaft rods 48, and the shaft rods 48 are screwed in the threaded shaft holes 47 below after rotating from the upper portions of the through holes 46. The roller 43 is rotatably sleeved on the round shaft 45, and the roller 43 is rotatably sleeved on the shaft rod 48 between the upper cam 40 and the lower cam 44. An upper rotating shaft 39 is arranged on the top surface of the top plate 37, a limiting block 38 is arranged on the top of the upper rotating shaft 39, a lower rotating shaft 42 is arranged on the bottom surface of the bottom plate 41, and a limiting block 38 is arranged on the bottom of the lower rotating shaft 42. The slide clamp 35 is rotatably mounted in the circular hole 36 of the support plate 33 by an upper rotating shaft 39 and a lower rotating shaft 42.
When the prestressed reinforcement auxiliary positioning device 15 is used, the horizontal coordinate of the prestressed reinforcement 3 to be fixed is taken as the standard, the fixing plate 16 is bound near the horizontal coordinate, and the position of the first sleeve 22 on the first rotating shaft 19 is adjusted through sliding to accurately reach the specific coordinate position. Since the fixed plate 16 is bound to be deviated and cannot be absolutely horizontal, the first sleeve 22 needs to be rotated to make the second sleeve 23 in a horizontal state, and after the first sleeve 22 is adjusted, the second rotating shaft 26 is rotated to make the third sleeve 27 in a vertical state, so that the sliding rod 30 in the third sleeve 27 is also in a vertical state. Then, the slide clamp 35 is rotated on the slide rod 30, and the vertical height of the slide clamp 35 on the slide rod 30 is adjusted, so as to adjust the height of the prestressed reinforcement 3 to be positioned, i.e. the distance between the prestressed reinforcement 3 and the upper end surface or the lower end surface of the beam. The shaft rod 48 of the sliding clamp 35 is pulled out, the clamp cage is opened, the prestressed reinforcement 3 is sleeved in, the shaft rod 48 is screwed in, the clamp cage is closed, and the clamping and positioning can be formed on the positioning point of the prestressed reinforcement 3. When the prestressed reinforcement 3 needs to be adjusted, the prestressed reinforcement 3 slides on the roller 43 of the clamp cage, so that the sheath is prevented from being cut in the sliding process. When the slide clamp 35 rotates on the slide rod 30 to change the prestressed reinforcement 3 at the same horizontal position, the front, rear, left and right positions can change the trend of the prestressed reinforcement 3, and some reinforcement dense areas are avoided. The rotation of the upper and lower shafts 39, 42 in the circular hole 36 of the support plate 33 ensures that the prestressed reinforcement 3 can pass through the clamp cage smoothly no matter where the slide clamp 35 is rotated.
In summary, the sliding rod 30 can be always vertically arranged by the rotating and sliding function of the first sleeve 22 and the rotating function of the third sleeve 27, so that the problem that the fixing plate 16 is difficult to accurately position when being bound on the longitudinal rib 14 is solved. The sliding function of the sliding rod 30 in the third sleeve 27 and the thread rotation function of the sliding clamp 35 on the sliding rod 30 realize the height positioning and fixing of the sliding clamp 35 on the sliding rod 30, and the rotation function of the clamp cage on the support plate 33 is matched, so that the fixing problem of the prestressed reinforcement 3 is also realized under the condition that the sliding rod 30 slightly deviates from the preset position.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a large-span slow bonding prestressed reinforcement concrete structure roof beam, for slow bonding prestressed concrete structure, including large-span slow bonding prestressed reinforcement roof beam and prestressed reinforcement auxiliary positioning device, large-span slow bonding prestressed reinforcement roof beam includes frame roof beam and frame post, it has slow bonding prestressed reinforcement to alternate in the frame roof beam, slow bonding prestressed reinforcement includes steel strand wires, slow bonding adhesive and PE sheath, be equipped with the roof beam reinforcing bar that plays the atress effect in the frame roof beam, the roof beam reinforcing bar is including indulging muscle and stirrup, indulge the steel reinforcement cage that muscle and stirrup connect component frame roof beam, its characterized in that: the prestressed reinforcement auxiliary positioning device is fixedly arranged below the longitudinal reinforcements and used for adjusting the distance between the slow bonding prestressed reinforcement and the upper end face or the lower end face of the frame beam, the slow bonding prestressed reinforcement extends out of two ends of the frame beam, a tension end and an anchoring end are respectively arranged in the side walls of two ends of the frame beam, the diameter of each steel strand is not less than 21.8mm, the ultimate strength standard value fptk of each steel strand is not less than 1860MPa, the tensile strength design value fpy is not less than 1320MPa, the compressive strength design value f' py = = not less than 390MPa, the maximum force total elongation is not less than 3.5%, the weight of each meter of the slow bonding prestressed reinforcement is 2.9-3.0 kg, the rib height of the slow bonding prestressed reinforcement is not less than 2.0mm, the rib groove depth is not less than 1.8mm, the standard tensile application period of the slow bonding adhesive is not less than 120 days, the standard curing time is not more than 360 days, the slow bonding prestressed reinforcement is arranged in a secondary tensile shape, and the distance L1-24000 mm between two frame columns is 21000-24000 mm;
the length L2 of the frame beam extending out of the frame column is 5000 mm-6000 mm;
the height H1 of the frame beam between the two frame columns is 1780 to 1820mm;
the height H2 of the frame beam extending out of the frame column is 1080-1120 mm;
the vertical distance H3 from the slow bonding prestressed steel bars at the tensioning end and the anchoring end to the upper end face of the frame beam is 280-320 mm;
the vertical distance H4 from the slow bonding prestressed reinforcement right above the center of the frame column to the upper end face of the frame beam is 130-170 mm;
the vertical distance H5 from the slow bonding prestressed reinforcement at the middle point of the length of the frame beam extending out of the frame column to the upper end face of the frame beam is 230-270 mm;
and the vertical distance H6 from the lowest point of the slow bonding prestressed reinforcement between the two frame columns to the lower end face of the frame beam is 130-170 mm.
2. The large-span slow-bonding prestressed reinforced concrete structural beam as claimed in claim 1, characterized in that: stretch-draw is served and is included first bearing plate, indirect reinforcing bar, cave mould and clip formula haplopore ground tackle, first bearing plate sets up in the frame roof beam, indirect reinforcing bar is installed to the inboard of first bearing plate, be equipped with cylindricality cave mould on the frame roof beam lateral wall in the first bearing plate outside, install clip formula haplopore ground tackle on the first bearing plate, clip formula haplopore ground tackle includes anchor ring and clamping piece, the anchor ring passes through cave mould concave yield frame roof beam in, slowly bond prestressed reinforcement and pass the muscle hole in the anchor ring and be equipped with the clamping piece in the muscle hole of anchor ring.
3. The large-span slow-bonding prestressed reinforced concrete structural beam as claimed in claim 2, wherein: the anchor end includes second bearing plate, indirect reinforcing bar and extrusion formula ground tackle, and the second bearing plate sets up in the frame roof beam, and indirect reinforcing bar is installed to the inboard of second bearing plate, and the extrusion formula ground tackle is installed in the outside of second bearing plate, and the prestressing steel bar that slowly bonds is pressed from both sides tightly by the extrusion formula ground tackle, and the prestressing steel bar that slowly bonds adopts sealed measure at the tip of anchor end.
4. The large-span slow-bonding prestressed reinforced concrete structural beam as claimed in claim 3, characterized in that: the efficiency coefficient of the clamping piece type single-hole anchor and the extrusion type anchor is not less than 0.95.
5. The large-span slow-bonding prestressed reinforced concrete structural beam according to claim 4, characterized in that: the concrete strength grade of concrete for pouring the frame beam and the frame column is not lower than C40, and the total content of chloride ions in the concrete of the frame beam is not more than 0.06 percent of the total weight of the gel material.
6. The large-span slow-bonded prestressed reinforced concrete structural beam according to any one of claims 1-5, wherein: the prestressed reinforcement auxiliary positioning device comprises two fixing plates and extension plates fixedly arranged below each fixing plate, a first rotating shaft is further arranged between the two extension plates, a plurality of jacks are formed in the fixing plates, the fixing plates are arranged below longitudinal bars at the tops of beam reinforcements, steel wires penetrate through the jacks to bind the fixing plates to the longitudinal bars, a first sleeve is further sleeved on the first rotating shaft, the first sleeve rotates and slides on the first rotating shaft, at least one first threaded hole is formed in the first sleeve, a first bolt is screwed in the first threaded hole and abuts against the first rotating shaft after being screwed, a second sleeve is further arranged on the first sleeve, the second sleeve is fixedly arranged on the side wall of the first sleeve, a second rotating shaft is further rotatably and slidably inserted in the second sleeve, at least one second threaded hole is formed in the second sleeve, a second bolt is screwed in the second threaded hole and abuts against the second rotating shaft after being screwed, a third sleeve is further arranged at the tail end of the second rotating shaft, the side wall of the third sleeve is vertically fixed at the tail end of the second rotating shaft, a third sleeve is further slidably inserted in the third sleeve, at least one third sleeve is provided with an external thread, a sliding bolt is slidably inserted in the third sleeve, a sliding rod, a clamping mechanism is further arranged on the third sleeve, and an external thread is arranged in the third sleeve, and a sliding mechanism is arranged on the sliding screw bolt, and abuts against the sliding mechanism.
7. The large-span slow-bonding prestressed reinforced concrete structural beam according to claim 6, characterized in that: the sliding clamping mechanism comprises a bracket and a sliding clamping piece rotatably arranged on the bracket.
8. The large-span slow-bonding prestressed reinforced concrete structural beam according to claim 7, characterized in that: the support comprises a fourth sleeve and two support plates, internal threads are arranged on the inner wall of the fourth sleeve, the fourth sleeve is in threaded connection with the external threads of the sliding rod through the internal threads, the two support plates are fixedly arranged at two ends of the side wall of the fourth sleeve respectively, round holes penetrating through the two support plates simultaneously are formed in the two support plates, and the sliding clamp is rotatably arranged in the round holes.
9. The large-span slow-bonding prestressed reinforced concrete structural beam as claimed in claim 8, wherein: the sliding clamp comprises a clamp cage and a roller, the clamp cage comprises a rectangular top plate and a rectangular bottom plate, upper convex blocks are arranged below the left end and the right end of the top plate respectively, at least three circular shafts with equal intervals are arranged between the two upper convex blocks, lower convex blocks are arranged above the left end and the right end of the bottom plate respectively, at least three circular shafts with equal intervals are arranged between the two lower convex blocks, the upper convex block at the left end of the top plate is fixedly connected with the lower convex block at the left end of the bottom plate through the circular shafts with equal intervals, at least three through holes with equal intervals are further formed in the upper convex block at the right end of the top plate, corresponding threaded shaft holes are further formed in the positions, relative to the through holes, of the lower convex block at the right end of the bottom plate, shaft levers are further arranged in the through holes and the threaded shaft holes simultaneously in a penetrating mode, external threads are arranged at the lower ends of the shaft levers, the shaft levers penetrate through holes from the upper sides of the through holes in a rotating mode, the roller rotating sleeve is arranged outside the circular shafts, a rotating sleeve outside the shaft, a rotating shaft is further arranged on the top surface of the top plate, a limiting block, and a limiting block is arranged on the bottom surface of the bottom plate. The sliding clamp is rotatably arranged in the round hole of the supporting plate through the upper rotating shaft and the lower rotating shaft.
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| CN202211289647.1A CN115538697A (en) | 2022-10-20 | 2022-10-20 | Large-span slow-bonding prestressed reinforced concrete structural beam |
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| CN202211289647.1A CN115538697A (en) | 2022-10-20 | 2022-10-20 | Large-span slow-bonding prestressed reinforced concrete structural beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116950235A (en) * | 2023-08-09 | 2023-10-27 | 合肥水泥研究设计院有限公司 | Large-span prestress frame structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116950235A (en) * | 2023-08-09 | 2023-10-27 | 合肥水泥研究设计院有限公司 | Large-span prestress frame structure |
| CN116950235B (en) * | 2023-08-09 | 2024-03-29 | 合肥水泥研究设计院有限公司 | Large-span prestress frame structure |
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