CN103088920B - Pre-tensioning prestressed composite beam structural system and construction method thereof - Google Patents
Pre-tensioning prestressed composite beam structural system and construction method thereof Download PDFInfo
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- CN103088920B CN103088920B CN201310055178.1A CN201310055178A CN103088920B CN 103088920 B CN103088920 B CN 103088920B CN 201310055178 A CN201310055178 A CN 201310055178A CN 103088920 B CN103088920 B CN 103088920B
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Abstract
The invention relates to a pre-tensioning prestressed composite beam structural system and a construction method of the pre-tensioning prestressed composite beam structural system. Lower longitudinal reinforcements are bound and lapped on lower longitudinal prestress wires in composite frame beam prefabricated components; the lower longitudinal reinforcements are inserted into frame pillars; second pre-buried steel plates are buried in the lower end portions of the composite frame beam prefabricated components; lower portion longitudinal prestress wires are buried in the composite frame beam prefabricated components; secondary beam longitudinal reinforcements are lapped and bound on the lower portion longitudinal prestress wires; the second pre-buried steel plates are welded with the secondary beam longitudinal reinforcements; first pre-buried steel plates opposite to the second pre-buried steel plates are arranged on the composite frame beam prefabricated components; pitch point steel plates are respectively welded on the first pre-buried steel plates and the second pre-buried steel plates; and the pitch point steel plates are connected through bolts, which enables the composite frame beam prefabricated components to connect with composite secondary beam prefabricated components. Wires and longitudinal reinforcements are lapped to use in the pre-tensioning prestressed composite beam structural system, and therefore the connecting mode of the pre-tensioning prestressed composite beam structural system is scientific and reasonable, and quality is safe and reliable.
Description
Technical field
The present invention relates to a kind of building prefabricated components and construction method thereof, be specifically related to a kind of pretensioned prestressing superposed beam structural system and construction method thereof, belong to technical field of civil engineering.
Background technology
Use steel strand as the pretensioned prestressing superposed beam of bottom longitudinal prestressing steel bar stress, have beam span large, deck-molding is little, the advantage that steel using amount is few, and precast prestressed concrete prefabricated integral frame structure is applied more.
But use steel strand as the structure of the pretensioned prestressing superposed beam of bottom longitudinal prestressing steel bar stress, there is following problem at concrete frame joint, Vierendeel girder and secondary beam position of joints:
1. concrete frame joint
First, though steel strand intensity is high, but its deformability is weak, very easily brittle fracture is there is under the effect of the cyclic reverse loading of seismic forces generation, therefore propose in existing " Code for design of concrete structures " " in prestressed concrete frame beam; the mode of presstressed reinforcing steel and plain bars hybrid reinforcement should be adopted ", and the arrangement of reinforcement proportion requirement of the plain bars proposed thus in Vierendeel girder end section bottom and prestressed reinforcement.Therefore for solving this problem, general employing two kinds of ways now, one is that elongated plain bars is set up in Vierendeel girder bottom, this reinforcing bar participates in designing and calculating, two is the plain barss only additionally increasing regulation ratio in framework beam-ends bottom, this part does not participate in designing and calculating, divides arrangement to put with Vierendeel girder bottom prestressed reinforcement.Because deck-siding is effective, the reinforcing bar number that individual layer can be arranged is limited, therefore these two kinds of ways, capital makes the reinforcing bar number of plies increase, thus cause moving in the Resultant force of bottom steel bar stress, the calculated height of steel bar stress reduces, and makes under nominal bending moments, reinforcing bar amount needed for Vierendeel girder bottom calculates increases, and too increases difficulty of construction simultaneously.
Secondly, the steel strand as Vierendeel girder bottom Reinforcement must stretch out beam-ends and anchor in post, at present the basic crotch anchor measure adopting linearity anchoring or steel strand end is bent 90 degree of crotches.But, anchorage length needed for linearity anchoring is very long, very uneconomical, and its anchorage length often to exceed post wide, be difficult to carry out, and the crotch anchoring effect of steel strand is not clear and definite yet in existing " Code for design of concrete structures " and other specification at present, and it is serious to there is the plastic strain of bending arc section, under action of pulling stress, easily there is brittle fracture herein, the straightway steel tendon of crotch is at random, when steel strand configuration is more, steel strand steel tendon at random overlaps each other, situation beyond the cross section of even exposing beam occurs, very easily produce dew muscle phenomenon.
2. Vierendeel girder and time girder connection
Also there is two problems in this node, one is the anchorage problem of the longitudinal steel strand in the superimposed secondary beam bottom of this Nodes prefabricated special anchor fixing structure.Because the precast prestressed special anchor fixing structure laminated frame crossing with secondary beam is set a roof beam in place more prefabricated special anchor fixing structure superimposed deck-molding, cause prefabricated special anchor fixing structure superimposed secondary beam bottom longitudinal stress steel strand cannot as Cast-in-situ Beam through layout, so make steel strand anchoring become a need problem to be processed.Mainly contain two kinds at present to solve the longitudinal steel strand in prefabricated special anchor fixing structure superimposed secondary beam bottom and set a roof beam in place and the anchor measure of prefabricated secondary beam Nodes at prefabricated frame, one punches in the precast prestressed beam prefabricated component relevant position of special anchor fixing structure composite frame, the longitudinal steel strand in the superimposed secondary beam bottom of prefabricated special anchor fixing structure can be passed through from hole, this method construction is complicated, and very easily cause concrete to water smashing leakiness, in hole, steel strand overlap on together in addition, the parcel effect of concrete to steel strand is poor, and anchoring effect is undesirable; Another kind method is that half part under the end of the superimposed secondary beam of prefabricated special anchor fixing structure is reserved a larger breach, longitudinal for bottom steel strand are upwards bent in indentation, there, form a crotch anchor, this method also easily forms indentation, there steel strand and overlaps each other, anchoring effect is undesirable, and the plastic strain of steel strand bending arc section is serious, and the straightway steel tendon of crotch is at random, also easily cause node steel strand to reveal muscle phenomenon to occur, the staying to establish of larger breach also can increase node formwork difficulty.
Secondly, be the Force Calculation model that the longitudinal steel strand anchoring mode in secondary beam bottom and node connected mode can have influence on time beam support, namely by hinged or consolidation calculation.Foregoing two kinds of secondary beam bottom steel strand anchoring modes, and the concrete plush copper burying overhanging channel-section steel or making evagination on secondary beam beam-ends top underground generally adopted at present, be shelved on the node connected mode of framework superposed beam prefabricated units end face, because secondary beam bottom steel strand anchoring effect is undesirable, and the cast-in-place overlapping layers of secondary beam is thinner, position of joints cast-in-situ concrete and preform surfaces bond effect undesirable, so for safety, in existing " precast prestressed concrete prefabricated integral frame structure technology code ", the secondary beam support that Vierendeel girder and secondary beam Nodes are formed is set as being articulated and connected.
When secondary beam support is set as being hinged on secondary beam Force Calculation, can cause secondary beam bottom steel bar stress consumption comparatively bearing concretion state increase more than 2 times, simultaneously according to existing " Code for design of concrete structures " requirement, in fact secondary beam support place because receiving partially restrained, therefore also also need additionally to configure on secondary beam top to be no less than 1/4 of secondary beam span centre lower rebar consumption, so cause secondary beam amount of reinforcement significantly to increase.
Therefore, for solving the problems of the technologies described above, necessaryly provide a kind of new pretensioned prestressing superposed beam structural system and construction method thereof, to overcome described defect of the prior art.
summary of the invention
For solving the problem, the object of the present invention is to provide a kind of sound construction, meet design specifications and connecting reliable pretensioned prestressing superposed beam structural system.
Another object of the present invention is to the construction method that a kind of pretensioned prestressing superposed beam structural system is provided.
For realizing above-mentioned first object, the technical scheme that the present invention takes is: a kind of pretensioned prestressing superposed beam structural system, and it comprises frame column, the beam prefabricated component of composite frame, superimposed secondary beam prefabricated units and cast-in-place overlapping layers; Wherein, be provided with lower longitudinal prestressing steel strand in the beam prefabricated component of described composite frame, on described lower longitudinal prestressing steel strand, colligation is overlapped with lower longitudinal reinforcement; Described lower longitudinal reinforcement extends in described frame column; The second pre-embedded steel slab is buried underground on described superimposed secondary beam prefabricated units bottom; Described superimposed secondary beam prefabricated units comprise a superimposed secondary beam prefabricated units main part, are provided with bottom longitudinal prestressing steel strand in superimposed secondary beam prefabricated units main part; Described bottom longitudinal prestressing steel strand overlap and is banded with secondary beam longitudinal reinforcement; Second pre-embedded steel slab welds mutually with secondary beam longitudinal reinforcement; The beam prefabricated component of described composite frame is provided with first pre-embedded steel slab relative with the second pre-embedded steel slab of described superimposed secondary beam prefabricated units; On described first pre-embedded steel slab and the second pre-embedded steel slab, be welded with node steel plate respectively, be bolted between described node steel plate, the beam prefabricated component of composite frame is connected with superimposed secondary beam prefabricated units.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: in described superimposed secondary beam prefabricated units main part, be provided with upper longitudinal further to prestress wire, secondary beam stirrup and the vertical reinforced mesh of secondary beam.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: the beam prefabricated component of described composite frame comprises a beam prefabricated member body portion of composite frame, is provided with upper longitudinal prestressing steel strand, stirrup and vertical reinforced mesh in described composite frame beam prefabricated member body portion; Described lower longitudinal prestressing steel strand are also arranged in the beam prefabricated member body portion of composite frame.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: described lower longitudinal prestressing steel strand are provided with multilayer, wherein, overlaps side by side about the most lower two-layer lower longitudinal prestressing steel strand and lower longitudinal reinforcement; Third layer and above lower longitudinal prestressing steel strand and lower longitudinal reinforcement overlap up and down, and lower longitudinal reinforcement is upper, lower longitudinal prestressing steel strand under; Described lower longitudinal reinforcement selects the trade mark to be the Ribbed Bar of HRB400, HRBF400, RRB400, HRB500 or HRBF500, and its section area is equal to or is greater than the section area of lower longitudinal prestressing steel strand.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: described secondary beam longitudinal reinforcement selects the trade mark to be the Ribbed Bar of HRB400, and its section area is equal to or is greater than the section area of bottom longitudinal prestressing steel strand; The colligation of described secondary beam longitudinal reinforcement in the upside of bottom longitudinal prestressing steel strand, and is partial to the inner side of superimposed secondary beam prefabricated units main part; Adjacent two described secondary beam longitudinal reinforcements are that same reinforcing bar bending forms; The straight minor face be bent to form and the welding of the second pre-embedded steel slab, weld bead height is not less than 6mm.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: described first pre-embedded steel slab and the second pre-embedded steel slab all adopt Q235 steel or Q345 steel, and thickness is not less than 10mm; Described second pre-embedded steel slab is installed with the hole of the large 3mm of more described bottom prestress steel twist linear diameter at described bottom prestress wire correspondence position.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: be provided with structure teeth groove in the end of described superimposed secondary beam prefabricated units main part, and this structure teeth groove is positioned at the below of upper longitudinal to 50mm on the downside of prestress wire; Described structure teeth groove is triangular in shape, tooth depth 25mm, facewidth 50mm, teeth groove spacing 50mm, and its number is 2-3; The bottom of described superimposed secondary beam prefabricated units main part from the second pre-embedded steel slab top edge above 50mm place to superimposed secondary beam prefabricated units main part is inwardly recessed 25mm, forms a small gap.
Pretensioned prestressing superposed beam structural system of the present invention is set to further: stay on the beam prefabricated component of described composite frame and establish recess, described recess hollow depth 25mm, width is with described superimposed secondary beam prefabricated units width, and described notched bottoms buries described first pre-embedded steel slab underground.
Pretensioned prestressing superposed beam structural system of the present invention is also set to: described cast-in-place overlapping layers comprises cast-in-situ concrete, and secondary beam top longitudinal reinforcement, Vierendeel girder top longitudinal reinforcement, closed stirrup in the connection gap of the beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the frame column stirrup of the beam prefabricated component of composite frame and frame column connecting portion, the cast-in-situ concrete of described cast-in-place overlapping layers is cast in frame column, between the beam prefabricated component of prefabricated composite frame and prefabricated superimposed secondary beam prefabricated units, and the upper surface of the beam prefabricated component of prefabricated composite frame and prefabricated superimposed secondary beam prefabricated units.
For realizing above-mentioned second object, the technical scheme that the present invention takes is: a kind of construction method of pretensioned prestressing superposed beam structural system, and it comprises following processing step:
1), the beam prefabricated component of prefabricated described composite frame: by longitudinal prestressing steel strand, lower longitudinal prestressing steel strand in designing requirement stretch-draw on prestressing force stretching bed for longline production, then longitudinal reinforcement, stirrup described in colligation, and place described vertical reinforced mesh at beam-ends, then formwork, build the concrete in the beam prefabricated member body portion of composite frame, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
2), prefabricated described superimposed secondary beam prefabricated units: cutting steel plate, boring make described second pre-embedded steel slab, described second pre-embedded steel slab welds described secondary beam longitudinal reinforcement, then on prestressing force stretching bed for longline production, stretch-draw upper longitudinal, to prestress wire, bottom longitudinal prestressing steel strand, and makes bottom longitudinal prestressing steel strand through the boring of the second pre-embedded steel slab; Then secondary beam longitudinal reinforcement described in colligation, secondary beam stirrup, place the secondary beam reinforced mesh of described beam-ends, then formwork, build the concrete of superimposed secondary beam prefabricated units main part, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
3), frame column is cast-in-place or install prefabricated frame column;
4), the bracing frame of the erection beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the template of cast-in-place overlapping layers;
5), the prefabricated units of the lifting beam prefabricated component of composite frame and superimposed secondary beam prefabricated units are on frame column, and be connected by the node steel plate of beam prefabricated for composite frame component with superimposed secondary beam prefabricated units, and the longitudinal reinforcement of the beam prefabricated component of composite frame is made to extend in described frame column;
6), closed stirrup in the connection gap of placement and colligation secondary beam top longitudinal reinforcement and Vierendeel girder top longitudinal reinforcement 43, the beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the frame column stirrup of the beam prefabricated component of composite frame and frame column connecting portion, then build described cast-in-place overlapping layers cast-in-situ concrete, frame column, the beam prefabricated component of composite frame, superimposed secondary beam prefabricated units are combined into one.
Compared with prior art, the present invention has following beneficial effect:
1. after the longitudinal reinforcement of the beam prefabricated component of composite frame of the present invention and described lower longitudinal prestressing steel strand overlap, in the Vierendeel girder width range of routine, reinforcing bar clear spacing still can keep more than 25mm, and single steel strand quantity does not reduce, thus move in the Resultant force avoiding described lower longitudinal prestressing steel strand, calculated height reduces, and causes the described lower longitudinal prestressing steel strand quantity needed for calculating to increase.
2. longitudinal reinforcement described in replaces described lower longitudinal prestressing steel strand, anchoring is entered in cross-section of frame column, thus, the anchorage length of described longitudinal reinforcement can the anchorage length of more described lower longitudinal prestressing steel strand significantly reduce, described longitudinal reinforcement can also take crotch anchoring simultaneously, anchorage length can be reduced further, can also mechanism anchorage method be taked, to adapt to more range of application and to improve anchoring effect.
3. described in, superimposed secondary beam prefabricated units main part is welded to connect by described secondary beam longitudinal reinforcement and described second pre-embedded steel slab, and described secondary beam longitudinal reinforcement and described bottom longitudinal prestressing steel strand overlap on request, the tensile stress that can effectively be produced under superposed beam Moment Influence by steel strand or compressive stress pass to the second pre-embedded steel slab of described beam-ends by described secondary beam longitudinal reinforcement, and pass to concrete by described second pre-embedded steel slab, so efficiently solve an anchoring difficult problem for the bottom longitudinal reinforcement of superimposed secondary beam prefabricated units.
4. the second pre-embedded steel slab described in is installed with hole for described bottom longitudinal prestressing steel strand, superimposed secondary beam prefabricated units can be met and on long-line pedestal, carry out steel strand tension and put an operation.
5. longitudinal reinforcement and the longitudinal prestressing steel strand of the beam prefabricated component of composite frame described in and described superimposed secondary beam prefabricated units overlap on request, add the number of steel bars in beam-ends bottom, when beam-ends bottom actual forced status is pressurized, effectively can reduce the concrete depth of section in pressure zone, thus effectively improve the plastic rotation of beam-ends plastic hinge region, make beam-ends cross section have enough Curvature Ductility.When beam-ends bottom is in tension state under the course under cyclic loading that wind load or seismic forces produce, described lower longitudinal reinforcement more described longitudinal prestressing steel strand have better ductility, effectively can prevent the brittle fracture of beam-ends.
6. longitudinal reinforcement and the described lower longitudinal prestressing steel strand of the beam prefabricated component of composite frame described in and superimposed secondary beam prefabricated units overlap on request, can reduce when described longitudinal prestressing steel strand are put composite frame beam prefabricated component ends periphery concrete local compressive stress, prevent the longitudinal prestressing steel strand periphery concrete local failure of described bottom, the transmission length of prestress of described bottom longitudinal prestressing steel strand can be shortened simultaneously.
7. the Nodes of the beam prefabricated component of composite frame described in and superimposed secondary beam prefabricated units, because there is structure teeth groove and described lower notch, make node when the concrete with cast-in-place overlapping layers is together cast-in-place, several anti-shear concrete key can be formed, simultaneously, the node steel plate of the beam prefabricated component of described composite frame and superimposed secondary beam prefabricated units, stirrup also can resist larger shearing, node shearing can be born preferably, anti-shear concrete key and described node steel plate simultaneously, first pre-embedded steel slab, second pre-embedded steel slab, stirrup can strengthen the bond effect of Nodes cast-in-situ concrete and precast concrete, node gap width is suitable in addition, cast-in-situ concrete vibration compacting can be guaranteed, so effectively can evade the generation in crack, guarantee the quality of connection of node.
8. the connected mode of the beam prefabricated component of composite frame described in and superimposed secondary beam prefabricated units not only effectively can improve the shear behavior of node as previously mentioned and concretely have effective adhesive, by described node steel plate, described superimposed secondary beam prefabricated units and the beam prefabricated component of composite frame are coupled together effectively simultaneously, under the impact of load, good cooperative transformation can be formed at this Nodes, thus make this node can meet node consolidation requirement in designing and calculating preferably, so make described superimposed secondary beam prefabricated units can carry out structure Design and Calculation according to bearing consolidation.
9. the connected mode of the beam prefabricated component of composite frame described in and superimposed secondary beam prefabricated units, when superimposed secondary beam prefabricated units are conducted oneself with dignity and working load is less, the bracing frame bottom superimposed secondary beam prefabricated units can be removed, directly by node steel plate and bolt support on the beam prefabricated component of composite frame.
Accompanying drawing explanation
Fig. 1 is the beam prefabricated component of composite frame and the schematic diagram of frame column after building of pretensioned prestressing superposed beam structural system of the present invention.
Fig. 2 is the beam prefabricated component of composite frame and the schematic diagram of superimposed secondary beam prefabricated units after building of pretensioned prestressing superposed beam structural system of the present invention.
Fig. 3 is the beam prefabricated component of composite frame and the superimposed secondary beam prefabricated units schematic diagram upon connection of pretensioned prestressing superposed beam structural system of the present invention.
Fig. 4 is the schematic diagram of the beam prefabricated component of composite frame in Fig. 1.
Fig. 5 is the sectional view along A-A in Fig. 4.
Fig. 6 is the schematic diagram of the superimposed secondary beam prefabricated units in Fig. 2.
Fig. 7 is the sectional view along B-B in Fig. 6.
Fig. 8 is the front schematic view of superimposed secondary beam prefabricated units.
Fig. 9 is the second pre-embedded steel slab of superimposed secondary beam prefabricated units and the connection diagram of secondary beam longitudinal reinforcement.
Figure 10 is the sectional view along C-C in Fig. 9.
Detailed description of the invention
Refer to shown in Figure of description 1 to accompanying drawing 10, the present invention is a kind of pretensioned prestressing superposed beam structural system, and it is made up of a few parts such as frame column 1, the beam prefabricated component of composite frame 2, superimposed secondary beam prefabricated units 3 and cast-in-place overlapping layerss 4.
Wherein, described superimposed secondary beam prefabricated units 3 are connected with the beam prefabricated component 2 of composite frame; The beam prefabricated component 2 of described composite frame is connected with frame column 1; The cast-in-situ concrete 41 of described cast-in-place overlapping layers 4 is built between frame column 1, the beam prefabricated component of composite frame 2, superimposed secondary beam prefabricated units 3 and surface, thus frame column 1, the beam prefabricated component of composite frame 2, superimposed secondary beam prefabricated units 3 and cast-in-place overlapping layers 4 is combined into one.In cast-in-place overlapping layers 4, be provided with secondary beam top longitudinal reinforcement 42, Vierendeel girder top longitudinal reinforcement 43, the beam prefabricated component of composite frame 2 be connected closed stirrup 5 in gap with superimposed secondary beam prefabricated units 3, and the frame column stirrup 44 of the beam prefabricated component 2 of composite frame and frame column 1 connecting portion.
The first pre-embedded steel slab 21 is buried at the two ends of the beam prefabricated component 2 of described composite frame respectively underground, and described first pre-embedded steel slab 21 adopts Q235 steel or Q345 steel, and thickness is not less than 10mm.Connecting reinforcement 22 is adopted to be welded to connect between described two piece of first pre-embedded steel slab 21.The second pre-embedded steel slab 31 buried underground by described superimposed secondary beam prefabricated units 3, and itself and the first pre-embedded steel slab 21 are oppositely arranged.On described first pre-embedded steel slab 21 and the second pre-embedded steel slab 31, be welded with node steel plate 6 respectively, be bolted between described node steel plate 6, the beam prefabricated component of composite frame 2 is connected with superimposed secondary beam prefabricated units 3.
The beam prefabricated component of described composite frame 2 has a beam prefabricated member body portion 23 of composite frame, is provided with upper longitudinal prestressing steel strand 24, lower longitudinal prestressing steel strand 25, stirrup 26 and vertical reinforced mesh 27 in described composite frame beam prefabricated member body portion 23.
Described vertical reinforced mesh 27 is arranged on the end near the beam prefabricated member body portion 23 of composite frame, and it is normally used reinforced mesh in pretensioning prestressed concrete component, and specific requirement can perform according to current specifications.
Colligation overlap joint longitudinal reinforcement 28 on described lower longitudinal prestressing steel strand 25.Described longitudinal reinforcement 28 extends the end in the beam prefabricated member body portion 23 of composite frame, its reinforcing bar selects the trade mark to be the Ribbed Bar of HRB400, HRBF400, RRB400, HRB500 or HRBF500, and its section area is equal to or is greater than the section area of lower longitudinal prestressing steel strand 25.
Described lower longitudinal prestressing steel strand 25 stretch out the end 5cm-10cm in the beam prefabricated member body portion 23 of composite frame, cut after putting to facilitate described lower longitudinal prestressing steel strand 25.
Described lower longitudinal prestressing steel strand 25 are provided with multilayer, itself and described longitudinal reinforcement 28 colligation overlap requirement and are: described lower longitudinal prestressing steel strand 25 are provided with multilayer, wherein, the most lower two-layer lower longitudinal prestressing steel strand 25 overlap side by side with longitudinal reinforcement about 28; Third layer and above lower longitudinal prestressing steel strand 25 overlap with longitudinal reinforcement about 28, and longitudinal reinforcement 28 is upper, lower longitudinal prestressing steel strand 25 under.In the present embodiment, described lower longitudinal prestressing steel strand 25 are provided with three layers.
Further, described longitudinal reinforcement 28 and the lap length of described lower longitudinal prestressing steel strand 25 equal the transmission length of prestress that 1.2 times of the basic anchorage length of reinforcing bar calculated with described longitudinal reinforcement 28 diameter and described pretensioned prestressing superposed beam prefabricated units concrete axial tensile strength design load according to existing " Code for design of concrete structures " add the presstressed reinforcing steel calculated by described lower longitudinal prestressing steel strand; The anchorage length that described reinforcing bar 6 stretches out beam-ends is more than or equal to the reinforcing bar pressurized anchorage length calculated with described longitudinal reinforcement 28 diameter and described pretensioned prestressing superposed beam prefabricated units concrete axial tensile strength design load according to existing " Code for design of concrete structures ".Described longitudinal reinforcement 28 extends in described frame column 1, thus frame column 1, the beam prefabricated component 2 of composite frame can be built in one.
Described superimposed secondary beam prefabricated units 3 comprise a superimposed secondary beam prefabricated units main part 32, are provided with upper longitudinal to prestress wire 33, bottom longitudinal prestressing steel strand 34, secondary beam stirrup 35 and the vertical reinforced mesh 36 of secondary beam in described superimposed secondary beam prefabricated units main part 32.Wherein, described bottom longitudinal prestressing steel strand 34 overlap and be banded with secondary beam longitudinal reinforcement 37.
Described secondary beam longitudinal reinforcement 37 selects the trade mark to be the Ribbed Bar of HRB400, and its section area is equal to or is greater than the section area of bottom longitudinal prestressing steel strand 34.The colligation of described secondary beam longitudinal reinforcement 37 in the upside of bottom longitudinal prestressing steel strand 34, and is partial to the inner side of superimposed secondary beam prefabricated units main part 32.This secondary beam longitudinal reinforcement 37 and the lap length of described bottom prestress wire 34 are more than or equal to 1.2 times of the anchorage length of steel bar calculated with described secondary beam longitudinal reinforcement 37 diameter and described superimposed secondary beam prefabricated units 3 concrete axial tensile strength design load calculated according to existing " Code for design of concrete structures ".Adjacent two described secondary beam longitudinal reinforcements 37 form for same reinforcing bar bends; The straight minor face 371 be bent to form and the second pre-embedded steel slab 31 weld, and weld bead height is not less than 6mm.
Described second pre-embedded steel slab 31 adopts Q235, Q345 steel, and steel plate thickness is not less than 10mm, and it is embedded in the bottom of superimposed secondary beam prefabricated units main part 32 in advance, and this second pre-embedded steel slab 31 and secondary beam longitudinal reinforcement 37 weld mutually.Described second pre-embedded steel slab 31 is installed with the hole 311 of the large 3mm of more described lower prestress steel strand 34 diameter at described lower prestress steel strand 34 correspondence position.
Be provided with a structure teeth groove 321 in the end of described superimposed secondary beam prefabricated units main part 32, this structure teeth groove 321 is positioned at the below of upper longitudinal to 50mm on the downside of prestress wire 33.Described structure teeth groove 33 is triangular in shape, tooth depth 25mm, facewidth 50mm, teeth groove spacing 50mm, and its number is 2-3.The bottom of described superimposed secondary beam prefabricated units main part 32 from the second pre-embedded steel slab 31 top edge above 50mm place to superimposed secondary beam prefabricated units main part 32 is inwardly recessed 25mm, forms a small gap 322.
Described reinforced mesh 36 is normally used reinforced mesh in pretensioning prestressed concrete component, and specific requirement can perform according to current specifications.
The construction method of pretensioned prestressing superposed beam structural system of the present invention is as follows:
1), the beam prefabricated component of prefabricated described composite frame 2: by longitudinal prestressing steel strand 24, lower longitudinal prestressing steel strand 25 in designing requirement stretch-draw on prestressing force stretching bed for longline production, then longitudinal reinforcement 28, stirrup 26 described in colligation, and place described vertical reinforced mesh 27 at beam-ends, then formwork, build the concrete in the beam prefabricated member body portion 23 of composite frame, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
2), prefabricated described superimposed secondary beam prefabricated units 3: cutting steel plate, boring make described second pre-embedded steel slab 31, described second pre-embedded steel slab 31 welds described secondary beam longitudinal reinforcement 37, then on prestressing force stretching bed for longline production, stretch-draw upper longitudinal, to prestress wire 33, bottom longitudinal prestressing steel strand 34, and makes bottom longitudinal prestressing steel strand 34 through the boring of the second pre-embedded steel slab 31; Then secondary beam longitudinal reinforcement 37 described in colligation, secondary beam stirrup 35, place the secondary beam reinforced mesh 36 of described beam-ends, then formwork, build the concrete of superimposed secondary beam prefabricated units main part 32, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
3), frame column 1 is cast-in-place or install prefabricated frame column 1;
4), the bracing frame of the beam prefabricated component of erection composite frame 2 and superimposed secondary beam prefabricated units 3, and the template of cast-in-place overlapping layers;
5), the prefabricated units of the beam prefabricated component of lifting composite frame 2 and superimposed secondary beam prefabricated units 3 are on frame column 1, and be connected by the node steel plate 6 of beam prefabricated for composite frame component 2 with superimposed secondary beam prefabricated units 3, and the longitudinal reinforcement 28 of the beam prefabricated component of composite frame 2 is made to extend in described frame column 1;
6), closed stirrup 5 in the connection gap of placement and colligation secondary beam top longitudinal reinforcement 42 and Vierendeel girder top longitudinal reinforcement 43, the beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the frame column stirrup 44 of the beam prefabricated component of composite frame and frame column connecting portion, then build described cast-in-place overlapping layers cast-in-situ concrete 41, frame column 1, the beam prefabricated component of composite frame 2, superimposed secondary beam prefabricated units 3 are combined into one.
Above detailed description of the invention is only the preferred embodiment of this creation, and not in order to limit this creation, any amendment made within all spirit in this creation and principle, equivalent replacement, improvement etc., within the protection domain that all should be included in this creation.
Claims (10)
1. a pretensioned prestressing superposed beam structural system, is characterized in that: comprise frame column, the beam prefabricated component of composite frame, superimposed secondary beam prefabricated units and cast-in-place overlapping layers; Wherein, be provided with lower longitudinal prestressing steel strand in the beam prefabricated component of described composite frame, on described lower longitudinal prestressing steel strand, colligation is overlapped with lower longitudinal reinforcement; Described lower longitudinal reinforcement extends in described frame column; The second pre-embedded steel slab is buried underground on described superimposed secondary beam prefabricated units bottom; Described superimposed secondary beam prefabricated units comprise a superimposed secondary beam prefabricated units main part, are provided with bottom longitudinal prestressing steel strand in superimposed secondary beam prefabricated units main part; Described bottom longitudinal prestressing steel strand overlap and is banded with secondary beam longitudinal reinforcement; Second pre-embedded steel slab welds mutually with secondary beam longitudinal reinforcement; The beam prefabricated component of described composite frame is provided with first pre-embedded steel slab relative with the second pre-embedded steel slab of described superimposed secondary beam prefabricated units; On described first pre-embedded steel slab and the second pre-embedded steel slab, be welded with node steel plate respectively, be bolted between described node steel plate, the beam prefabricated component of composite frame is connected with superimposed secondary beam prefabricated units.
2. pretensioned prestressing superposed beam structural system as claimed in claim 1, is characterized in that: in described superimposed secondary beam prefabricated units main part, be provided with upper longitudinal further to prestress wire, secondary beam stirrup and the vertical reinforced mesh of secondary beam.
3. pretensioned prestressing superposed beam structural system as claimed in claim 1, it is characterized in that: the beam prefabricated component of described composite frame comprises a beam prefabricated member body portion of composite frame, in described composite frame beam prefabricated member body portion, be provided with upper longitudinal prestressing steel strand, stirrup and vertical reinforced mesh; Described lower longitudinal prestressing steel strand are also arranged in the beam prefabricated member body portion of composite frame.
4. pretensioned prestressing superposed beam structural system as claimed in claim 3, is characterized in that: described lower longitudinal prestressing steel strand are provided with multilayer, wherein, overlaps side by side about the most lower two-layer lower longitudinal prestressing steel strand and lower longitudinal reinforcement; Third layer and above lower longitudinal prestressing steel strand and lower longitudinal reinforcement overlap up and down, and lower longitudinal reinforcement is upper, lower longitudinal prestressing steel strand under; Described lower longitudinal reinforcement selects the trade mark to be the Ribbed Bar of HRB400, HRBF400, RRB400, HRB500 or HRBF500, and its section area is equal to or is greater than the section area of lower longitudinal prestressing steel strand.
5. pretensioned prestressing superposed beam structural system as claimed in claim 1, is characterized in that: described secondary beam longitudinal reinforcement selects the trade mark to be the Ribbed Bar of HRB400, and its section area is equal to or is greater than the section area of bottom longitudinal prestressing steel strand; The colligation of described secondary beam longitudinal reinforcement in the upside of bottom longitudinal prestressing steel strand, and is partial to the inner side of superimposed secondary beam prefabricated units main part; Adjacent two described secondary beam longitudinal reinforcements are that same reinforcing bar bending forms; The straight minor face be bent to form and the welding of the second pre-embedded steel slab, weld bead height is not less than 6mm.
6. pretensioned prestressing superposed beam structural system as claimed in claim 1, is characterized in that: described first pre-embedded steel slab and the second pre-embedded steel slab all adopt Q235 steel or Q345 steel, and thickness is not less than 10mm; Described second pre-embedded steel slab is installed with the hole of the large 3mm of more described bottom prestress steel twist linear diameter in prestress wire corresponding position, described bottom.
7. pretensioned prestressing superposed beam structural system as claimed in claim 1, is characterized in that: be provided with structure teeth groove in the end of described superimposed secondary beam prefabricated units main part, and this structure teeth groove is positioned at the below of upper longitudinal to 50mm on the downside of prestress wire; Described structure teeth groove is triangular in shape, tooth depth 25mm, facewidth 50mm, teeth groove spacing 50mm, and its number is 2-3; The bottom of described superimposed secondary beam prefabricated units main part from the second pre-embedded steel slab top edge above 50mm place to superimposed secondary beam prefabricated units main part is inwardly recessed 25mm, forms a small gap.
8. pretensioned prestressing superposed beam structural system as claimed in claim 3, it is characterized in that: stay on the beam prefabricated component of described composite frame and establish recess, described recess hollow depth 25mm, width is with described superimposed secondary beam prefabricated units width, and described notched bottoms buries described first pre-embedded steel slab underground.
9. pretensioned prestressing superposed beam structural system as claimed in claim 1, it is characterized in that: described cast-in-place overlapping layers comprises cast-in-situ concrete, and secondary beam top longitudinal reinforcement, Vierendeel girder top longitudinal reinforcement, closed stirrup in the connection gap of the beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the frame column stirrup of the beam prefabricated component of composite frame and frame column connecting portion, the cast-in-situ concrete of described cast-in-place overlapping layers is cast in frame column, between the beam prefabricated component of prefabricated composite frame and prefabricated superimposed secondary beam prefabricated units, and the upper surface of the beam prefabricated component of prefabricated composite frame and prefabricated superimposed secondary beam prefabricated units.
10. a construction method for the pretensioned prestressing superposed beam structural system as described in claim 1-9 item any one, is characterized in that: comprise following processing step:
1), the beam prefabricated component of prefabricated described composite frame: by longitudinal prestressing steel strand, lower longitudinal prestressing steel strand in designing requirement stretch-draw on prestressing force stretching bed for longline production, then longitudinal reinforcement, stirrup described in colligation, and place described vertical reinforced mesh at beam-ends, then formwork, build the concrete in the beam prefabricated member body portion of composite frame, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
2), prefabricated described superimposed secondary beam prefabricated units: cutting steel plate, boring make described second pre-embedded steel slab, described second pre-embedded steel slab welds described secondary beam longitudinal reinforcement, then on prestressing force stretching bed for longline production, stretch-draw upper longitudinal, to prestress wire, bottom longitudinal prestressing steel strand, and makes bottom longitudinal prestressing steel strand through the boring of the second pre-embedded steel slab; Then secondary beam longitudinal reinforcement described in colligation, secondary beam stirrup, place the secondary beam reinforced mesh of described beam-ends, then formwork, build the concrete of superimposed secondary beam prefabricated units main part, reach steel strand after design strength until this concrete to put, cut off, and transport job site to;
3), frame column is cast-in-place or install prefabricated frame column;
4), the bracing frame of the erection beam prefabricated component of composite frame and superimposed secondary beam prefabricated units, and the template of cast-in-place overlapping layers;
5), the prefabricated units of the lifting beam prefabricated component of composite frame and superimposed secondary beam prefabricated units are on frame column, and be connected by the node steel plate of beam prefabricated for composite frame component with superimposed secondary beam prefabricated units, and the longitudinal reinforcement of the beam prefabricated component of composite frame is made to extend in described frame column;
6), the beam prefabricated component of composite frame, superimposed secondary beam prefabricated units are equipped with floor and indulge muscle, and closed stirrup;
7), secondary beam top longitudinal reinforcement in the cast-in-place overlapping layers of colligation, Vierendeel girder top longitudinal reinforcement, the beam prefabricated component of composite frame are connected the closed stirrup in gap with superimposed secondary beam prefabricated units, and the frame column stirrup of the beam prefabricated component of composite frame and frame column connecting portion, build described cast-in-place overlapping layers cast-in-situ concrete, frame column, the beam prefabricated component of composite frame, superimposed secondary beam prefabricated units are combined into one.
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| CN111608313A (en) * | 2020-05-21 | 2020-09-01 | 南通四建集团有限公司 | Tensioning node of T-beam wing plate under post-tensioning unbonded prestressed rib plate and construction method |
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