CN106012806B - Cored slab hinge seam Shear connection construction and construction technology - Google Patents

Cored slab hinge seam Shear connection construction and construction technology Download PDF

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Publication number
CN106012806B
CN106012806B CN201610437324.0A CN201610437324A CN106012806B CN 106012806 B CN106012806 B CN 106012806B CN 201610437324 A CN201610437324 A CN 201610437324A CN 106012806 B CN106012806 B CN 106012806B
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cored slab
hinge seam
shear
seam
hinge
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CN106012806A (en
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何穆
戴小松
周强新
秦建刚
孟润民
王勇
胡华峰
李利忠
杨磊
王甲兵
毛晓龙
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China Construction Third Engineering Bureau Group Co Ltd
China Construction Third Bureau Third Construction Engineering Co Ltd
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China Construction Third Engineering Bureau Group Co Ltd
China Construction Third Bureau Third Construction Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges

Abstract

The invention discloses a kind of cored slabs to cut with scissors seam Shear connection construction and construction technology, the cored slab hinge seam Shear connection construction includes the cored slab that same plane longitudinally mutually splices, hinge seam is formed between the cored slab, it is perfused with concrete in the hinge seam, it is united layer above the cored slab, it is formed by concreting, hinged seam shear connector is also set up in the hinge seam, the hinge seam shear connector includes the steel panel that opposition is arranged on hinge seam both sides cored slab side wall, shearing peg and PBL shear connectors are connected in the steel panel, the shearing peg is located at steel panel and cored slab connecting side, the PBL shear connectors are located at hinge seam side, the corresponding PBL shear connectors in hinge seam both sides are by running through bar connecting, to realize the mutual splicing of cored slab.The shear connector of composition rigid flexible system is used in combination in shearing peg and PBL shear connectors, can give full play to respective strong point, and anti-fatigue performance is good under the working condition for bearing dynamic load, improves the durability and performance of hinge seam connection between Method Pre-stress Concrete Hollow Slab.

Description

Cored slab hinge seam Shear connection construction and construction technology
Technical field
The present invention relates to Bridge Design and technical field of construction, in particular to a kind of cored slab cut with scissors seam Shear connection construction and Construction technology.
Technical background
Due to assembled steel reinforced concrete or prefabricated concrete hollow slab have structural behaviour it is good, from heavy and light, standardization Production, transport installation and the various features such as easy for construction and be widely adopted and China's Mid and minor spans beam bridge superstructure is normal One of supporting member.After prefabricated reinforced concrete or prefabricated concrete hollow slab are set up onto bridge pier, cast in situs Hinge between each precast hollow slab plate stitches concrete to form the superstructure of bridge.Under Vehicle Load, Method Pre-stress Concrete Hollow Slab Between hinge seam concrete be in cut and by curved effect stress, but based on the effect of being cut.Hinge seam is between Method Pre-stress Concrete Hollow Slab The significant points of Hollow Slab Beam Bridge superstructure, it connects each precast hollow slab to form whole superstructure and carry transmission The key effect of mobile load internal force between each precast hollow slab plate, therefore the shear behavior that seam is cut with scissors between plate determines the whole of Hollow Slab Beam Bridge Body stress performance.
The safety stock of conventional hollow board concrete hinge seam is far below prefabricated harden structure itself, since hinge seam is excessively narrow Space makes hinge seam concrete pouring quality be not easy to ensure, and cohesive force can also weaken between new-old concrete, be cut with scissors between usual plate Seam steel bar arrangement is on the low side, and pre-buried lateral connection rigidity of soft tissues degree Shortcomings, tensile capacity is relatively low, to function well as Lateral connection acts on so that hollow slab bridge insufficient rigidity, bridge integrity are poor.When a large amount of differences occurs in hinge seam between Method Pre-stress Concrete Hollow Slab When the breakage of degree, then cause bridge structure that related disease occurs, common bridge floor occurs single after hinge seam direction longitudinal cracking Plate stress etc. will finally cause structural bearing capacity to reduce.Such as three bridge access bridge right-hand lane part bridge of the Qianjiang of Hangzhou in 2011 The unexpected slump in face, the access bridge superstructure collapsed are prefabricated concrete hollow slab, and hinge seam construction is weaker between plate, is overloading Vehicle accumulates over a long period under constantly effect, and hinge seam, united layer and pave-load layer are finally overloading from crack is generated to cracking, fracture Cause edge cored slab to overturn and collapse under lorry impact force action, generates serious consequence.
Invention content
It is excellent to provide one kind reasonable for structure, economic security, switching performance aiming at the deficiencies in the prior art by the present invention Cored slab hinge seam Shear connection construction and construction technology.
To achieve the goals above, the cored slab hinge seam Shear connection construction designed by the present invention, including same plane are vertical Form hinge seam to the cored slab mutually spliced, between the cored slab, the hinge stitch in be perfused with concrete, on the cored slab Side is united layer, and the united layer is formed by concreting, is characterized in that:
Hinged seam shear connector is also set up in the hinge seam, the hinge seam shear connector includes that opposition setting is stitched in hinge Steel panel on the cored slab side wall of both sides is connected with shearing peg and PBL shear connectors, the shearing peg position in the steel panel It in steel panel and cored slab connecting side, and is embedded in cored slab, the PBL shear connectors are located at hinge seam side, and hinge seam both sides are corresponding PBL shear connectors are by running through bar connecting, to realize the mutual splicing of cored slab.
Preferably, the shearing peg is arranged symmetrically with PBL shear connectors along steel panel.So that shearing peg is sheared with PBL The Shear transfer path of key is succinct and power transmission is reliable.
Further, several circular connecting holes are provided on the PBL shear connectors, it is described to pass through connection through reinforcing bar Corresponding PBL is sheared and is keyed by hole.It can be achieved through reinforcing bar and hole concrete tenon synergistic effect Transfer of Shear, construction is more Add facility, and also can be used as the stiffener of hinge seam concrete through reinforcing bar.
A more step, the connecting hole interlaced arrangement.The shearing power transmission of PBL shear connectors is more reasonable, acts on PBL shear connectors Shear stress relatively dispersion and uniformly.
Still further, the hinge seam shear connector is using double PBL shear connector connection structures.Double PBL shear connectors and institute Pre-buried shearing peg and steel panel cooperation are more preferable, keep structure more secured.
Still further, described use finish rolling deformed bar or regular reinforcement through reinforcing bar.Shearing size feelings are stitched according to hinge Condition selects finish rolling deformed bar or regular reinforcement, wherein finish rolling deformed bar shear behavior is more preferable.
Still further, the hinge seam shear connector is provided with several groups, arranged for interval is in longitudinal hinge seam.According to Stressing conditions are longitudinally arranged shear connector, reinforce hinge seam integrated connection effect between Method Pre-stress Concrete Hollow Slab.
Preferably, hinge seam bottom uses mortar joint filling, and the hinge sews on portion and united layer uses steel fibre UEA Expansive concrete.Reduce conjunction old and new concret facial cleft seam.
Still further, further including reinforcing rib, the reinforcing rib is placed in hinge seam or a part is arranged in hinge seam, separately A part is embedded in cored slab, and the reinforcing rib is located between two hinge seam shear connectors.Reinforce connecting between Method Pre-stress Concrete Hollow Slab It connects, increase hinge seam concrete globality to improve shear resistance.
A kind of construction technology that the cored slab hinge seam Shear connection as described in power 1 constructs, includes the following steps:
Step 1:Shearing peg is welded in steel panel, and in precast hollow slab, by the steel with shearing peg Siding is embedded on cored slab side wall, wherein the shearing peg is located in cored slab;
Step 2:PBL shear connectors are set on the cored slab in step 1, and the PBL shear connectors are welded in steel panel;
Step 3:The cored slab obtained by above-mentioned steps is assembled, hinge seam both sides PBL shear connectors are handed between two Method Pre-stress Concrete Hollow Slabs when assembly Fork overlapping, and fixed by running through reinforcing bar;
Step 4:Seam is cut with scissors between the Method Pre-stress Concrete Hollow Slab after the completion of assembly to pour, form cored slab hinge seam and cut with concrete Power connecting structure.
The advantage of the invention is that:
1, the shear connector of shearing peg and PBL shear connector rigid flexible systems is set between Method Pre-stress Concrete Hollow Slab in hinge seam, it can be big Width improves the shear resistance that seam is cut with scissors between Method Pre-stress Concrete Hollow Slab, enhances effect of the hinge seam as lateral connection between plate, improves The structural integrity of blank board bridge can preferably transmit bridge floor load, achieve the purpose that the common stress of each plate.
2, hinge seam combines cored slab by hinge seam shear connector between plate, and forms steel-and mix composite structure, both Steel tension and the characteristic of concrete anti-compression can be made full use of, the deficiency of concrete ductility difference is made up, and coagulation can be made full use of The good advantage of native durability, anti-fatigue performance is good under the working condition for bearing dynamic load, is cut with scissors between Method Pre-stress Concrete Hollow Slab to improve Stitch the durability and performance of connection.
3, the shearing peg being embedded in cored slab belongs to flexible shear connector, and ductility is good, good deformation performance The uneven stress between shearing peg can be adjusted, the bearing capacity of all shearing pegs can be given full play to.And PBL shear connectors are made For rigid shear connector, by concrete tenon in steel plate hole and through the synergistic effect Transfer of Shear of reinforcing bar, shearing resistance is held Load power is larger, and fatigue behaviour is good, and PBL shear connectors can improve the application property of steel bar arrangement, while can play the work of stiffener With.The shear connector of composition rigid flexible system is used in combination in shearing peg and PBL shear connectors, can give full play to respective strong point.
Between Method Pre-stress Concrete Hollow Slab of the present invention hinge seam Shear connection tectonic sieving it is novel, reasonable for structure, stress is clear, function admirable and Fatigue resistance and durability are good, and hollow slab bridge girder construction can be made to form good entirety;Hinge seam connection construction work between Method Pre-stress Concrete Hollow Slab Skill so that convenient construction, economic security.
Description of the drawings
Fig. 1 is the schematic view of facade structure of invention cored slab hinge seam Shear connection construction.
Fig. 2 cuts with scissors the schematic view of facade structure of seam shear connector between cored slab.
Fig. 3 cuts with scissors the side structure schematic view of seam shear connector between cored slab.
Fig. 4 cuts with scissors the plane arrangement structure schematic diagram of seam shear connector between cored slab.
Fig. 5 cuts with scissors the arrangement schematic diagram for stitching upper and lower shear reinforcement between cored slab.
Fig. 6 cuts with scissors the arrangement schematic diagram of seam cross wise reinforcement and longitudinal reinforcement between cored slab.
In figure:Cored slab 1, hinge seam 2(Wherein:Mortar 2.1), united layer 3, hinge seam shear connector 4, steel panel 4.1, Shearing peg 4.2, PBL shear connectors 4.3 run through reinforcing bar 4.4, connecting hole 4.5, reinforcing rib 5(Wherein:Top shear reinforcement 5.1, Lower part shear reinforcement 5.2, cross wise reinforcement 5.3, longitudinal reinforcement 5.4).
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
Cored slab hinge seam Shear connection as shown in the figure constructs, including the cored slab 1 that same plane longitudinally mutually splices, empty Hinge seam 2 is formed between core 1, concrete is perfused in hinge seam 2,1 top of cored slab is united layer 3, and united layer 3 is by coagulation Soil pours, and in order to reinforce hinge seam integrated connection effect between Method Pre-stress Concrete Hollow Slab, several groups hinge seam Shear connection is provided in hinge seam 2 Part 4, hinge seam 4 arranged for interval of shear connector are set in longitudinal hinge seam 2 generally according to situations such as cored slab hinge crack structure stress Set longitudinal pitch.Hinge seam shear connector 4 includes the steel panel 4.1 that opposition is arranged on hinge seam 2 both sides cored slab, 1 side wall, steel Shearing peg 4.2 and PBL shear connectors 4.3 are connected on siding 4.1, shearing peg 4.2 is located at steel panel 4.1 and connects with cored slab 1 Side is connect, and is embedded in advance in cored slab 1, shearing peg 4.2 is a kind of flexible shear connector, and arrangement is convenient, flexible, can be according to sky 1 side wall dimensions of core and stressing conditions selection peg model and laying mode.PBL shear connectors 4.3 are located at 2 sides of hinge seam, PBL shearings It is provided with several circular connecting holes 4.5 on key 4.3, the corresponding PBL shear connectors in 2 both sides of hinge seam 4.3 are worn by running through reinforcing bar 4.4 The connection of circular connecting hole 4.5 is crossed, to realize that the mutual splicing of cored slab 1, circular connecting hole 4.5 can be realized through reinforcing bar 4.4 and hole concrete tenon act synergistically Transfer of Shear, construction is more convenient, and also can be used as hinge seam through reinforcing bar 4.4 and mix Coagulate the stiffener of soil.Shearing power transmission generally for PBL shear connectors 4.3 is more reasonable, acts on cutting for PBL shear connectors 4.3 and answers Power is relatively disperseed and uniformly, connecting hole 4.5 is generally according to hinge seam 2 both sides PBL shear connectors, 4.3 cross-connect field size between plate and cuts Situations such as power transmission path be laid staggeredly hole position;There are between certain for mutually matched two PBL shear connectors 4.3 overlapping infall Gap is not to be close to two-by-two.Shearing size cases are stitched according to hinge, finish rolling deformed bar or regular reinforcement are used through reinforcing bar 4.4, Wherein, finish rolling deformed bar shear behavior is more preferable.The connection type of shearing peg 4.2 and PBL shear connectors 4.3 and steel panel 4.1 It is welding, and shearing peg 4.2 is embedded on cored slab 1 in advance with steel panel 4.1, in the prefabricated laggard andante of cored slab 1 Between hinge seam 2 both sides PBL shear connectors 4.3 correspond to arrangement position and be welded in pre-buried steel panel 4.1.For stress equalization, Usual shearing peg 4.2 and PBL shear connectors 4.3 are arranged symmetrically along steel panel 4.1.So that shearing peg 4.2 and PBL shear connectors 4.3 Shear transfer path is succinct and power transmission is reliable.
In order to make PBL shear connectors 4.3 coordinate more preferably with pre-buried shearing peg 4.2 and steel panel 4.1, structure is more firm Gu the hinge seam shear connector 4 of every group of cored slab 1 uses double 4.3 structure types of PBL shear connectors, and according to the enterprise of hinge seam 2 between plate Mouth size determines the size of PBL shear connectors 4.3.2 bottom gaps of hinge seam are smaller, pour mixed mud leakage in order to prevent, generally adopt With 2.1 joint filling of mortar, then use steel fibre UEA expansive concretes, by change the time-varying characteristics of concrete material come Achieve the purpose that reduce its contraction, creep beharior.Meanwhile sectional jump pours, i.e., along hinge 2 length direction merogenesis segment hoppings of seam It pours, the drawback for avoiding whole elongated cast-in-place rear concrete shrinkage deformation larger.General hinge seam 2 pours the sky that can derive to splicing 1 top of core forms one layer of united layer 3, and road pavement layer is located at 3 top of united layer.
In order to reinforce globality to improve shear resistance, this programme is also devised with reinforcing rib 5, and reinforcing rib 5 is placed in hinge seam 2 Interior, and between two groups of hinges stitch shear connectors 4, be placed in shown in Fig. 6 in hinge seam 2, reinforcing rib can be by cross wise reinforcement 5.3 and vertical It is formed to reinforcing bar 5.4.As shown in figure 5, reinforcing rib 5 can be arranged in a part in hinge seam 2, another part is embedded in cored slab In 1, formed respectively in the top shear reinforcement 5.1 and lower part shear reinforcement 5.2 for cutting with scissors 2 top and the bottom of seam by being arranged.
The construction technology of cored slab hinge seam Shear connection construction of the present invention mainly includes the following steps that:
(1)It is rationally designed by structural requirement, hinge seam shear connector 4 between processing and manufacturing 1 plate of cored slab, and will first shear bolt Nail 4.2 is welded in steel panel 4.1;By structural requirement precast hollow slab 1, and when prefabricated, shearing peg 4.2 will be welded with Steel panel 4.1 is embedded on 1 side wall of cored slab, and shearing peg 4.2 is located at cored slab side, and is embedded in advance in cored slab 1;
(2)It is accurately positioned PBL shear connectors 4.3 and longitudinal measure is on pre-buried 4.1 outside of steel panel;
(3)Cored slab 1 is assembled by structural requirement, is attached between each plate plate, 4.3 hole of hinge 2 both sides PBL shear connectors of seam between plate Position matching, is used in combination and is fixed through reinforcing bar 4.4;
(4)Pouring concrete after cutting with scissors seam 2 and united layer 3 of constructing by structural requirement forms cored slab hinge seam connecting structure, shape At bridge entirety superstructure.
Cored slab hinge seam Shear connection structural form of the present invention makes full use of steel and concrete material characteristic, makes its stress It is more reasonable, easy for construction, overall economic efficiency is good.Compared with prior art, cored slab hinge seam Shear connection structure of the present invention It makes and the advantages of construction technology is:
1, the shear connector of shearing peg and PBL shear connector rigid flexible systems is set between Method Pre-stress Concrete Hollow Slab in hinge seam, it can be big Width improves the shear resistance that seam is cut with scissors between Method Pre-stress Concrete Hollow Slab, enhances effect of the hinge seam as lateral connection between plate, improves The structural integrity of blank board bridge can preferably transmit bridge floor load, achieve the purpose that the common stress of each plate.
2, hinge seam combines cored slab by shear connector between plate, and forms steel-and mix composite structure, Ji Nengchong Divide the characteristic using steel tension and concrete anti-compression, makes up the deficiency of concrete ductility difference, and concrete can be made full use of resistance to The good advantage of long property, anti-fatigue performance is good under the working condition for bearing dynamic load, connects to improve hinge seam between Method Pre-stress Concrete Hollow Slab The durability and performance connect.
3, the shearing peg being embedded in cored slab belongs to flexible shear connector, and ductility is good, good deformation performance The uneven stress between peg can be adjusted, the bearing capacity of all pegs can be given full play to.And PBL shear connectors are cut as rigidity Power connector, by concrete tenon in steel plate hole and through the synergistic effect Transfer of Shear of reinforcing bar, shear-carrying capacity is larger, Fatigue behaviour is good, and PBL shear connectors can improve the application property of steel bar arrangement, while can play the role of stiffener.Shear bolt The shear connector of composition rigid flexible system is used in combination in nail and PBL shear connectors, can give full play to respective strong point.
4, it after the steel panel in cored slab hinge seam shear connector is embedded in precast hollow slab by shearing peg, then carries out The outside for being accurately positioned and being welded on pre-buried steel panel of PBL shear connectors, i.e. first pre-buried shearing peg and steel panel repositioning weldering PBL shear connectors are connect, processing, installation accuracy are high, convenient construction so that hollow board prefabrication and joint connection in site construction technology are simply easy Row, reliable in quality, economic security are reasonable.
5, construction using the present invention and construction technology can improve rigidity, durability and the peace of hollow slab bridge girder construction Quan Xing makes whole force-bearing situation be improved, and can be effectively prevented from conventional concrete cored slab or prefabricated concrete hollow slab The generation of bridge defect saves later stage bridge maintenance and maintenance and reinforcement expense, extends the service life of bridge.

Claims (10)

1. a kind of cored slab hinge seam Shear connection constructs, including the cored slab (1) that same plane longitudinally mutually splices, described hollow Hinge seam (2) is formed between plate, concrete is perfused in the hinge seam (2), is united layer (3), institute above the cored slab (1) United layer (3) is stated to be formed by concreting, it is characterised in that:Hinged seam shear connector is also set up in the hinge seam (2) (4), the hinge seam shear connector (4) includes steel panel of the opposition setting on hinge seam (2) both sides cored slab (1) side wall (4.1), shearing peg (4.2) and PBL shear connectors (4.3), the shearing peg (4.2) are connected on the steel panel (4.1) It positioned at steel panel (4.1) and cored slab (1) connecting side, and is embedded in cored slab (1), the PBL shear connectors (4.3) are located at hinge and stitch (2) side, the corresponding PBL shear connectors (4.3) in hinge seam (2) both sides are by running through reinforcing bar (4.4) connection, to realize cored slab (1) Mutually splicing, the shearing peg (4.2) and PBL shear connectors (4.3) of the shear connector (4) are vertically arranged in hinge is stitched.
2. cored slab hinge seam Shear connection construction according to claim 1, it is characterised in that:The shearing peg (4.2) It is arranged symmetrically along steel panel with PBL shear connectors (4.3).
3. cored slab hinge seam Shear connection construction according to claim 2, it is characterised in that:The PBL shear connectors (4.3) On be provided with several circular connecting holes (4.5), it is described to cut corresponding PBL across connecting hole (4.5) through reinforcing bar (4.4) Power key (4.3) connects.
4. cored slab hinge seam Shear connection construction according to claim 3, it is characterised in that:The connecting hole (4.5) is handed over Mistake arrangement.
5. cored slab hinge seam Shear connection construction according to claim 4, it is characterised in that:The hinge stitches shear connector (4) using double PBL shear connector (4.3) connection structures.
6. cored slab hinge seam Shear connection construction according to claim 5, it is characterised in that:It is described to run through reinforcing bar (4.4) Using finish rolling deformed bar or regular reinforcement.
7. cutting with scissors seam Shear connection construction according to cored slab according to any one of claims 1 to 6, it is characterised in that:The hinge Seam shear connector (4) is provided with several groups, and arranged for interval is in longitudinal hinge seam (2).
8. cored slab hinge seam Shear connection construction according to claim 7, it is characterised in that:It adopts the hinge seam (2) bottom With mortar joint filling, hinge seam (2) top and united layer (3) use steel fibre UEA expansive concretes.
9. cored slab hinge seam Shear connection construction according to claim 8, it is characterised in that:Further include reinforcing rib (5), institute State that reinforcing rib (5) is placed in hinge seam (2) or a part is arranged in hinge seam (2), another part is embedded in cored slab (1), The reinforcing rib (5) is located between two groups of hinges seam shear connectors (4).
10. a kind of construction technology that the cored slab hinge seam Shear connection as described in power 1 constructs, includes the following steps:
Step 1:Shearing peg is welded in steel panel, and in precast hollow slab, the steel panel with shearing peg is pre- It is embedded on cored slab side wall, wherein the shearing peg is located in cored slab;
Step 2:PBL shear connectors are set on the cored slab in step 1, and the PBL shear connectors are welded in steel panel;
Step 3:The cored slab obtained by above-mentioned steps is assembled, hinge seam both sides PBL shear connectors intersect weight between two Method Pre-stress Concrete Hollow Slabs when assembly It is folded, and fixed by running through reinforcing bar;
Step 4:Seam is cut with scissors between the Method Pre-stress Concrete Hollow Slab after the completion of assembly to pour, form cored slab hinge seam shearing and connect with concrete Connect construction.
CN201610437324.0A 2016-06-17 2016-06-17 Cored slab hinge seam Shear connection construction and construction technology Active CN106012806B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106400667A (en) * 2016-11-16 2017-02-15 上海市城市建设设计研究总院 Hollow plate beam structure for ultrahigh performance concrete hinge joint connection

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CN103061418A (en) * 2013-01-14 2013-04-24 西南交通大学 Continuous variable-stiffness shear key type steel-concrete joint section
CN103726439A (en) * 2014-01-02 2014-04-16 东南大学 Reinforcing steel bar structure of hinge joint

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006307473A (en) * 2005-04-27 2006-11-09 Gaeart Tk:Kk Design method for extended floor slab
CN201648945U (en) * 2009-09-28 2010-11-24 江苏省交通科学研究院股份有限公司 Prestressed hollow slab beam hinge joint connecting part
KR101123842B1 (en) * 2011-05-06 2012-03-16 홍석희 The construction method and the continuous structure with gerber's hinge made by the rigid connection between the civil engineering structure and approach slab, and inserted by the mesnage hinge in the continuous approach slab
CN202595616U (en) * 2012-04-13 2012-12-12 长沙理工大学 Concrete bridge with durable hinge joint device
CN202899018U (en) * 2012-11-11 2013-04-24 安徽工业大学 Hinge joint shear transfer device
CN103061418A (en) * 2013-01-14 2013-04-24 西南交通大学 Continuous variable-stiffness shear key type steel-concrete joint section
CN103726439A (en) * 2014-01-02 2014-04-16 东南大学 Reinforcing steel bar structure of hinge joint

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