CN206752288U - A kind of interior suspension cable compound section bridge - Google Patents
A kind of interior suspension cable compound section bridge Download PDFInfo
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- CN206752288U CN206752288U CN201720441650.9U CN201720441650U CN206752288U CN 206752288 U CN206752288 U CN 206752288U CN 201720441650 U CN201720441650 U CN 201720441650U CN 206752288 U CN206752288 U CN 206752288U
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Abstract
The utility model discloses a kind of interior suspension cable compound section bridge.The bridge includes the left and right top boom of horizontal structure, the left and right lower boom of arcs of recesses structure, the vertical web member and diagonal web member being connected between top boom, lower boom, the at least twice steel suspension cable being respectively arranged along left and right lower boom cambered surface, and the steel plate of top boom top surface and the concrete being cast on steel plate are laid on, and shear stud is provided with steel plate.Assembling is carried out to each part first during construction, arranges steel suspension cable, and first time tensioning is carried out to steel suspension cable, after the completion of single tension, carries out casting concrete；Because bridge top concrete account for whole bridge deadweight more than 70%, therefore steel truss and once new stress distribution, due to the weight of concrete, truss lower boom is set to occur tension again, therefore need to carry out second or repeatedly stretching to steel suspension cable again, tension is from lower boom to the transfer of steel suspension cable in completion lower edge, and lower edge is regenerated certain compression.
Description
Technical field
It the utility model is related to a kind of interior suspension cable compound section bridge.Specifically a kind of body of a bridge is steel truss, bridge floor
For concrete slab, in bridge beam body（I.e. in steel truss）Place the bridge pattern of steel suspension cable.
Background technology
Bridge divides from big type, there is a variety of patterns, including simply supported girder bridge, arch bridge, cable-stayed bridge, suspension bridge, continuous
Rigid frame bridge etc..
For simply supported girder bridge, except that form the different materials in beam body section, and different combination of materials sections and
Different cross section geometric patterns.
With the development of reinforced concrete technology, beam body material turns into the combination of reinforcing bar and concrete, and cross section type then may be used
To be box-type section or i shaped cross section.
Normal reinforced concrete beam develops into prestressed concrete beam, and beam body material then becomes reinforcing bar and steel strand wires, then
Plus the combination of concrete.And tensioning can be implemented to steel strand wires, to change the stress distribution in casing.
Develop into modern age appearance steel truss-concrete composite bridge and steel box-girder-concrete composite bridge be respectively then
Bottom steel truss, the combination of top concrete slab（A kind of this bridge is usually used in combined dual deck bridge）With bottom steel plate
The box beam of welding and the combination form of top concrete slab.
Usually said suspension bridge has two tall and big bridge piers, to hang and fix suspension cable, in the first-class horizontal range of suspension cable
Provided with hoist cable, Bridge Beam body is played, Bridge Beam body is then steel box-girder, steel truss or concrete box girder.Due to necessarily being produced in suspension cable
Raw huge horizontal force, therefore, it is necessary to set huge anchor ingot to balance suspension cable horizontal force in bridge both sides.It is less for span
Suspension bridge, equilibrium level power, i.e. self-anchored suspension bridge can also be come by concrete box girder.
For common Simple Supported Steel Truss Bridge beam, steel truss top boom is always pressurized, lower boom always tension, simultaneously
Necessarily there are some diagonal web member tensions to resist shearing, if steel truss lower boom is designed into symmetrical parabolic type, lower edge
Bar can resist the lower edge draw-bar pull caused by moment of flexure, while can also undertake most of shearing, and this is mainly due to lower boom angle
The change of degree and rod member pulling force is had vertical component.It is most economical pressed material in view of concrete, while high-strength steel suspension cable
It is most economical tension material again, therefore, is winded up if concrete is placed in into steel truss, high-strength steel suspension cable is placed in steel truss lower edge,
And make triple combination's stress, then the force structure of a very economical is necessarily obtained, i.e., most of pressure of winding up is undertaken by concrete,
Most of lower edge pulling force and web member shearing is undertaken by steel suspension cable, steel truss frame body then plays stress transmission and stabilization.
The content of the invention
The purpose of this utility model is based upon steel suspension cable tensioning and realizes the principle of stress transmission and provide in one kind and hang
Rope compound section bridge, it is the type of bridge that a kind of simply supported beam compound section bridge is combined with suspension bridge.
The purpose of this utility model can be realized by following technique measures：
Interior suspension cable compound section bridge of the present utility model includes the left and right top boom of horizontal structure, a left side for arcs of recesses structure
Bottom right chord member, the vertical web member and diagonal web member being connected between top boom, lower boom, is respectively arranged along left and right lower boom cambered surface
At least twice steel suspension cable, and the steel plate of top boom top surface and the concrete being cast on steel plate are laid on by connector, and
The shear stud for affixed concrete is provided with steel plate.（Top boom is with steel plate, shear stud, concrete as one
It is overall, winding up for bridge is collectively formed, and play compression rod in bridge force-bearing）.
Lower boom described in the utility model is parabolic shaped structure, is connected by gusset plate with vertical web member, diagonal web member；
The steel suspension cable is tied up by thermoplastic PVC boundlings by more non-binding steel strand wires and formed, and steel suspension cable is arranged along lower boom, steel suspension cable
During by each vertical web member lower end, through arc fixture and lower boom Joint, the parabola consistent with lower boom is formed
Type structure；The steel suspension cable is tied up by thermoplastic PVC boundlings by more non-binding steel strand wires and formed.
The end of steel suspension cable described in the utility model sequentially passes through top boom, steel plate, steel anchoring part, is fixed by anchor ring；
The anchor ring is included for clamping steel strand wires by root after steel suspension cable tensioning, to keep the intermediate plate of the stretching force of steel strand wires；Institute
State anchor ring top and be provided with the keeper plate of steel for acting to compress anchor ring inner clamp piece, be anchored on using connector on anchor ring.
Lower boom described in the utility model, vertical web member, diagonal web member are connected on gusset plate by high-strength bolt, institute
Arc fixture is stated to be fixed on gusset plate using connector；And the lower boom, vertical web member, diagonal web member are in gusset plate both sides
It is arranged symmetrically, the arc fixture is equally divided into gusset plate both sides, and twice steel suspension cable is respectively from being divided into gusset plate both sides
Passed through in arc fixture, change an angle, and a parabolic type is integrally formed.
Furtherly, for common Simple Supported Steel Truss Bridge beam, steel truss top boom is always pressurized, and lower boom is always
Tension, while necessarily have some diagonal web member tensions to resist shearing, if steel truss lower boom is designed into symmetrical parabola
Type, then lower boom can resist the lower edge draw-bar pull caused by moment of flexure, while can also undertake most of shearing, this mainly due to
The change of lower boom angle and rod member pulling force is had vertical component.It is most economical pressed material in view of concrete, at the same it is high
Strong steel suspension cable is most economical tension material again, therefore, is winded up if concrete is placed in into steel truss, high-strength steel suspension cable is placed in steel truss
Frame lower edge, and make triple combination's stress, then the force structure of a very economical is necessarily obtained, i.e., is undertaken by concrete in major part
String pressure, most of lower edge pulling force and web member being undertaken by steel suspension cable and sheared, steel truss frame body then plays stress transmission and stabilization,
Here it is core content of the present utility model.
Construction method of the present utility model comprises the following steps：
A, each part being prefabricated in the factory is subjected to Assembling first, steel truss structure is assembled into by connector,
Steel suspension cable is arranged, and first time tensioning is carried out to steel suspension cable（Because steel truss has certain deadweight, can be winded up production in steel truss
Raw pressure, pulling force is produced in lower boom, the pulling force in lower boom is transferred completely on steel suspension cable by first time tensioning, and lead to
Crossing certain ultra stretching makes to produce certain compression in shaped steel lower boom, so that there is more tensions to store up in lower boom
It is standby）, after the completion of single tension, shear stud is welded on steel plate winding up, assembling reinforcement net, and casting concrete；
B, because bridge top concrete account for whole bridge deadweight more than 70%, therefore, there is steel truss again after casting concrete
Once new stress distribution, due to the weight of concrete, truss lower boom is set to occur tension again, it is therefore desirable to enter to steel suspension cable
Capable second or repeatedly stretching（After concrete strength reaches 70%）, complete lower edge in tension from lower boom to steel suspension cable
Transfer, and lower edge is regenerated certain compression, its result is exactly, under all bridge gravity loads, the drawing of lower edge
Power is all undertaken by steel suspension cable, and lower boom has certain compressive pre-stress, therefore, have bigger drawing should due to the effect of drag-line
Power deposit.
Because the steel strand wires intensity used in steel suspension cable is nearly 6 times of shaped steel, steel strand wires intensity is 1860MPa, and Q345 types
The yield strength of steel is 345MPa, therefore, can be big with steel suspension cable come to undertake pulling force be mode more more effective than shaped steel, more economical
The big deadweight for mitigating steel truss lower pole segments.
Above casting concrete, the process of tensioning can also be carried out several times again when concrete strength is to certain value.Work as bridge
Beam span is larger, when overlying concrete layer is thicker（Such as larger than 20cm）, when concrete just pours, concrete does not have intensity, because
This, rod pressure of being winded up caused by concrete gravity all will be undertaken by top boom（Supported by steel truss as cast-in-place concrete
Situation during system）, it is contemplated that weight concrete accounts for the weight that bridge is conducted oneself with dignity more than 70%, and this means that most of bridge certainly
Pressure of being winded up caused by weight fails to be undertaken by concrete, it is therefore necessary to which gradation casting concrete, it is certain strong to treat that concrete has
Gradation tensioning steel suspension cable again when spending, so, so that it may top concrete layer is undertaken a part in advance and wind up rod pressure.
Furtherly：
1st, it is prefabricated in the factory, the steel truss of assembly at the scene：It is recessed parabola that steel truss, which winds up as horizontal line, lower edge,
Steel truss winds up to be made up of shaped steel, steel plate, and its light plate is connected with shaped steel by high-strength bolt, and shearing resistance bolt is welded with steel plate
Nail, in case being connected with concrete integral；Steel truss lower edge is also made up of shaped steel, and parabolic is integrally formed in the linear pattern by being segmented
Line style；Between upper and lower chord member, every one section of equal horizontal range, vertical web member is installed（Depression bar）, in two vertical abdomens
Diagonal web member is installed between bar（Pull bar）, depression bar and pull bar are also all made up of shaped steel.Web member and upper and lower chord member connect through section
Point plate, is connected with high-strength bolt.
2nd, the high-strength steel suspension cable arranged along lower boom（Interior suspension cable）, steel suspension cable is close to truss lower boom arrangement, positioned at vertical
Between web member bottom and lower boom.Steel suspension cable often passes through a vertical web member, all fixture through an arc（Turn to fixture）,
Arc fixture is fixed on vertical web member bottom, applies a vertical displacement constraint to drag-line, meanwhile, drag-line is changed an angle
Degree, so, makes drag-line on the whole as lower boom, forms a parabola.Steel cable is made up of boundling non-bending steel cable,
Each single steel strand is all individually wrapped in the PVC sheath containing lubricating oil, this allow steel strand wires integrally freely extend without
By the restrictions of the frictional force of vertical web member position arc fixture.More non-binding steel strand wires can be tied in steel suspension cable factory by special equipment
Beam is bundled into, and is wrapped up with thermoplastic PVC.
3rd, steel truss winds up cast-in-place concrete layer：Concrete layer is anti-on steel plate by being welded in steel truss top steel plate
Cut peg connection, in cast-in-place concrete on steel plate, can a number of bar-mat reinforcement of colligation, to improve the entire compression of concrete
Ability.
At the both ends of each boundling non-bending steel cable, there is the anchoring part for being fixed on steel truss top boom, steel strand wires pass through
Top boom and anchoring part, steel strand wires end have porous anchor ring and intermediate plate to fix, and have keeper plate of steel on anchor ring with clamping intermediate plate, prevent steel from twisting
Loosened after line tensioning.
The utility model combines self-anchored suspension bridge with steel truss-Combined concrete section bridge, in steel truss support body
It is interior to place two or a plurality of suspension cable, the horizontal force of steel suspension cable is balanced by the concrete slab on steel truss top, forms steel truss
Add steel suspension cable, top is the compound section pattern bridge of concrete slab.Bridge pattern of the present utility model is than common steel truss
Frame-Combined concrete section bridge, deadweight are lighter, it is possible to achieve span it is bigger, and under same span, during bridge bearing
Amount of deflection is smaller（I.e. rigidity is bigger）, while tall and big Sarasota is eliminated again, construction is easier, is a kind of very promising bridge
Beam type formula.
The beneficial effects of the utility model are as follows：
1st, because lower boom employs parabolic type, by active tensioning steel suspension cable, steel suspension cable both assume responsibility for common steel truss
The pulling force of lower boom in frame, has also taken on the pulling force of most of diagonal web member.
2nd, due to that lower boom can be arrived into the compression limit by tensioning steel suspension cable pressure in theory, therefore lower boom is provided with
It is double to draw the stress deposit of tensile strength in itself when bearing dynamic load.
3rd, because bridge deadweight is always considerably larger than bridge dynamic load, and bridge in static load in lower boom and web member caused by
Pulling force is all undertaken by the intensity drag-line more much higher than shaped steel again, therefore, than common steel-concrete section bridge, this
Utility model is bearing mode more efficiently.
4th, deflection of bridge span is greatly decreased, and adds the rigidity of bridge：Because the process of tensioning steel suspension cable is on mechanics principle
Equivalent to a reverse bending moment is integrally applied to bridge, this makes bridge to arch, therefore the lower amount of deflection of bridge can obtain actively controlling
System, under bridge action of static load, always can make bridge have a certain degree of camber, this is with there is lower boom by tensioning
Compression be consistent, therefore, bridge integral rigidity considerably increases.
5th, the whole steel structure part of the utility model is prefabricated in the factory, at the scene can be directly assembled, after assembly is good, top steel plate
It is used as the direct casting concrete of template.Substantial amounts of scaffold and form work engineering are eliminated, is particularly suitable for across road, gully
Bridge construction.
Brief description of the drawings
Fig. 1 is hoist cable stress transmission schematic diagram.
Fig. 2 is the utility model essential structure schematic diagram.
Fig. 3 is Fig. 1 cross section view（The essential structure of interior suspension cable compound section bridge）.
Fig. 4 is Fig. 2 A positions enlarged drawing（Stretch-draw node detail drawing）.
Fig. 5 is Fig. 2 B positions enlarged drawing（Steel truss lower boom connecting node detail drawing）.
Fig. 6 is Fig. 5 side view.
Sequence number in figure：1st, top boom（What shaped steel was formed）, 2, steel plate（It is connected with top boom）, 3, shear stud,
4th, concrete, 5, lower boom（The steel truss lower edge of shaped steel composition）, 6, steel suspension cable, 7, gusset plate, 8, vertical web member, 9, arc card
Tool, 10, diagonal web member（When truss is by uneven load, by pulling force effect, while as the stabiliser bar of steel truss）, 11,12 are
Bar is linked, 13 abutments, 14 be steel anchoring part, and 15 be anchor ring, and 16 be keeper plate of steel.
Embodiment
The utility model is below with reference to embodiment（Accompanying drawing）It is further described：
As shown in Figure 2,3, interior suspension cable compound section bridge of the present utility model includes the left and right top boom 1 of horizontal structure,
The left and right lower boom 5 of arcs of recesses structure, the vertical web member 8 and diagonal web member 10 being connected between top boom 1, lower boom 5, along left and right
At least twice steel suspension cable 6 that the cambered surface of lower boom 5 is respectively arranged, and it is laid on by connector the He of steel plate 2 of the top surface of top boom 1
The concrete 4 being cast on steel plate, and it is provided with steel plate the shear stud 3 for affixed concrete 4.（Top boom 1 and steel
Plate 2, shear stud 3, concrete 4 are used as an entirety, collectively form winding up for bridge, and compression rod work is played in bridge force-bearing
With）.
Lower boom 5 described in the utility model is parabolic shaped structure, passes through gusset plate 7 and vertical web member 8, diagonal web member 10
Connection；The steel suspension cable 6 is tied up by thermoplastic PVC boundlings by more non-binding steel strand wires and formed, and steel suspension cable 6 is along the cloth of lower boom 5
Put, when steel suspension cable 6 is by each vertical 8 lower end of web member, through arc fixture 9 and the Joint of lower boom 5, formation and lower boom
Consistent parabolic shaped structure.
As shown in figure 4, the end of steel suspension cable described in the utility model 6 sequentially passes through top boom 1, steel plate 2, steel anchoring part
14, fixed by anchor ring 15；The anchor ring 15 is included for clamping steel strand wires by root after steel suspension cable tensioning, to keep steel strand wires
Stretching force intermediate plate；The keeper plate of steel 16 for acting to compress anchor ring inner clamp piece is provided with the anchor ring top, using connection
Part is anchored on anchor ring 15.
As shown in Figure 5,6, lower boom 5 described in the utility model, vertical web member 8, diagonal web member 10 pass through high-strength bolt
It is connected on gusset plate 7, the arc fixture 9 is fixed on gusset plate using connector；And the lower boom 5, vertical web member
8th, diagonal web member 10 is arranged symmetrically in gusset plate both sides, and the arc fixture 9 is equally divided into the both sides of gusset plate 7, and twice steel hangs
Rope 6 passes through from the arc fixture for being divided into the both sides of gusset plate 7 respectively, changes an angle, and a parabola is integrally formed
Type.
Furtherly, for common Simple Supported Steel Truss Bridge beam, steel truss top boom is always pressurized, and lower boom is always
Tension, while necessarily have some diagonal web member tensions to resist shearing, if steel truss lower boom is designed into symmetrical parabola
Type, then lower boom can resist the lower edge draw-bar pull caused by moment of flexure, while can also undertake most of shearing, this mainly due to
The change of lower boom angle and rod member pulling force is had vertical component.It is most economical pressed material in view of concrete, at the same it is high
Strong steel suspension cable is most economical tension material again, therefore, is winded up if concrete is placed in into steel truss, high-strength steel suspension cable is placed in steel truss
Frame lower edge, and make triple combination's stress, then the force structure of a very economical is necessarily obtained, i.e., is undertaken by concrete in major part
String pressure, most of lower edge pulling force and web member being undertaken by steel suspension cable and sheared, steel truss frame body then plays stress transmission and stabilization,
Here it is core content of the present utility model.
Construction method of the present utility model comprises the following steps：
A, each part being prefabricated in the factory is subjected to Assembling first, steel truss structure is assembled into by connector,
Steel suspension cable is arranged, and first time tensioning is carried out to steel suspension cable（Because steel truss has certain deadweight, can be winded up production in steel truss
Raw pressure, pulling force is produced in lower boom, the pulling force in lower boom is transferred completely on steel suspension cable by first time tensioning, and lead to
Crossing certain ultra stretching makes to produce certain compression in shaped steel lower boom, so that there is more tensions to store up in lower boom
It is standby）, after the completion of single tension, shear stud is welded on steel plate winding up, assembling reinforcement net, and casting concrete；
B, because bridge top concrete account for whole bridge deadweight more than 70%, therefore, steel truss and once new stress
Distribution, due to the weight of concrete, makes truss lower boom occur tension again, it is therefore desirable to steel suspension cable is carried out second or more
Secondary tensioning（After concrete strength reaches 70%）, completing tension in lower edge, from lower boom to the transfer of steel suspension cable, and makes shaped steel
The steel truss lower edge of composition --- lower boom regenerates certain compression, and its result is exactly, in all bridges from heavy burden
Under load, the pulling force of lower edge is all undertaken by steel suspension cable, the steel truss lower edge of shaped steel composition --- lower boom due to the effect of drag-line,
There is certain compressive pre-stress, therefore, there is bigger tension deposit.
Because the steel strand wires intensity used in steel suspension cable is nearly 6 times of shaped steel, steel strand wires intensity is 1860MPa, and Q345 types
The yield strength of steel is 345MPa, therefore, can be big with steel suspension cable come to undertake pulling force be mode more more effective than shaped steel, more economical
The big deadweight for mitigating steel truss lower pole segments.
Above casting concrete, the process of tensioning can also be carried out several times again when concrete strength is to certain value.Work as bridge
Beam span is larger, when overlying concrete layer is thicker（Such as larger than 20cm）, when concrete just pours, concrete does not have intensity, because
This, rod pressure of being winded up caused by concrete gravity all will be undertaken by top boom（Supported by steel truss as cast-in-place concrete
Situation during system）, it is contemplated that weight concrete accounts for the weight that bridge is conducted oneself with dignity more than 70%, and this means that most of bridge certainly
Pressure of being winded up caused by weight fails to be undertaken by concrete, it is therefore necessary to which gradation casting concrete, it is certain strong to treat that concrete has
Gradation tensioning steel suspension cable again when spending, so, so that it may top concrete layer is undertaken a part in advance and wind up rod pressure.
Furtherly：
1st, it is prefabricated in the factory, the steel truss of assembly at the scene：It is recessed parabola that steel truss, which winds up as horizontal line, lower edge,
Steel truss winds up to be made up of shaped steel, steel plate, and its light plate is connected with shaped steel by high-strength bolt, and shearing resistance bolt is welded with steel plate
Nail, in case being connected with concrete integral；Steel truss lower edge is also made up of shaped steel, and parabolic is integrally formed in the linear pattern by being segmented
Line style；Between upper and lower chord member, every one section of equal horizontal range, vertical web member is installed（Depression bar）, in two vertical abdomens
Diagonal web member is installed between bar（Pull bar）, depression bar and pull bar are also all made up of shaped steel.Web member and upper and lower chord member connect through section
Point plate, is connected with high-strength bolt.
2nd, the high-strength steel suspension cable arranged along lower boom（Interior suspension cable）, steel suspension cable is close to truss lower boom arrangement, positioned at vertical
Between web member bottom and lower boom.Steel suspension cable often passes through a vertical web member, all fixture through an arc（Turn to fixture）,
Arc fixture is fixed on vertical web member bottom, applies a vertical displacement constraint to drag-line, meanwhile, drag-line is changed an angle
Degree, so, makes drag-line on the whole as lower boom, forms a parabola.Steel cable is made up of boundling non-bending steel cable,
Each single steel strand is all individually wrapped in the PVC sheath containing lubricating oil, this allow steel strand wires integrally freely extend without
By the restrictions of the frictional force of vertical web member position arc fixture.More non-binding steel strand wires can be tied in steel suspension cable factory by special equipment
Beam is bundled into, and is wrapped up with thermoplastic PVC.
3rd, steel truss winds up cast-in-place concrete layer：Concrete layer is anti-on steel plate by being welded in steel truss top steel plate
Cut peg connection, in cast-in-place concrete on steel plate, can a number of bar-mat reinforcement of colligation, to improve the entire compression of concrete
Ability.
At the both ends of each boundling non-bending steel cable, there is the anchoring part for being fixed on steel truss top boom, steel strand wires pass through
Top boom and anchoring part, steel strand wires end have porous anchor ring and intermediate plate to fix, and have keeper plate of steel on anchor ring with clamping intermediate plate, prevent steel from twisting
Loosened after line tensioning.
The Specific construction mode of interior hanging bridge
The specific real work mode of the utility model is described in detail below in conjunction with accompanying drawing.
With two tracks, exemplified by span 50m simple span bridge, the wide 9.5m of bridge, the wherein each 1.5m in both sides pavement, two cars
Road, per the wide 3.25m in track, it is made up of two Pin steel truss.
See Fig. 3 main truss frame material type selectings：Top shaped steel chord member 1 selects L200x12, and bottom shaped steel chord member 5 is selected
L150x10, material are Q345 steel, and other web members 8 and contact bar 10 typically use L126x8 or L100x8, and tension web member is then selected
L75x8.Gusset plate 7 selects 12mmQ345 steel plates, and node board size meets bolt arrangement requirement.The connection of shaped steel and gusset plate is complete
Portion is connected using high-strength friction bolt.
Using the steel wire bundle of the non-bending steel cables of 4 10x Φ 15.2 composition, two beams are installed per truss structure altogether for steel suspension cable 6,
It is symmetrically installed in truss both sides.Steel strand wires strength grade 1860MPa.
In each position of joints of top boom, and web member interface point position is connected with one block of plain plate 2, plain plate with it is upper
Chord member is connected with high-strength bolt, and shear stud 3 is welded with plain plate, and shear stud spacing, which is pressed, arranges one per 10cmx10cm,
Shear stud diameter of phi 18mm, material Q345 steel, every piece of plate size 50cm（It is wide）x12mm（It is thick）, overlying isometric with top boom
20cm thickness concrete layer 4, by shear stud 3 and the steel that winds upPlate 2 connectsConnect.
Linking perpendicular to upper and lower chord member is respectively arranged between the top boom plane and lower boom plane of two truss structures
Bar is connected with the oblique bar that links.
In each node facade perpendicular to truss,（See Fig. 3）, also there is the vertical bar and oblique of linking（Cross）Link bar company
Two truss structures are connect, to realize the lateral connection of two truss structures.
The plane on truss, the region beyond shear stud steel plate are separately equipped with 1.0mm steel sheet and plates, sheet metal portion on the lower
Tie element supports between truss, acts the template action for pouring top concrete.Sheet metal top can lay bar-mat reinforcement, and good in cloth
After bar-mat reinforcement, casting concrete.
Because the tie element under sheet metal is distant, when laying sheet metal, the place big to part steel plate span,
It can temporarily be fixed under steel plate and strengthen angle steel, it is dismountable after concreting solidification.
Sequence of construction
1st, both sides abutment 13 is first built up at scene, such as Fig. 2.
2nd, steel truss frame member：Including the inter-tie and transverse tie between upper and lower chord member, web member, connecting plate and two truss structures
Bar all machines in factory, and accomplishes fluently High-strength bolt hole by design requirement.
3rd, in bridge Assembling truss, after being assembled per truss structure, lifting is in place respectively, and blending bolt is fixed on both sides
Abutment.
4th, after two truss structures are all in place, the inter-tie between truss is installed, sway brace, make two truss structures formed one it is whole
Body.
The 5th, the shear stud steel plate of pricncipal rafter position of joints is installed, the shear stud on shear stud steel plate is with special
Be welded in shear stud bonding machine on steel plate, bolt hole be separately equipped with steel plate, it is corresponding with top boom upper bolt hole, steel plate with it is upper
Chord member is connected with high-strength bolt.
The 6th, steel suspension cable is installed：Totally 4 bar steel suspension cable, bunchy is tied up with 10 non-bending steel cables of Φ 15.2 per bar steel suspension cable,
And wrapped up with thermoplastic PVC.A branch of steel suspension cable is installed respectively per truss structure both sides, steel suspension cable is close to lower boom arrangement, in each of the lower
There is a fixing point at chord member gusset plate position, and fixed point is provided with an arc steering gear, and vertical web member is fixed in steering gear
With lower boom intersection area, steel suspension cable can pass through from arc steering gear is hollow.Steel suspension cable both ends pass through top boom and shear stud
Steel plate, it is fixed on special anchoring part and anchor ring, steel suspension cable can be tight with jack repeatedly stretching and fixed by anchor ring and anchoring part.
7th, sheet metal of the steel truss top as template is laid, and side mould is installed.Due to top boom top shear stud steel
Every piece of plate only 50cm is wide, therefore, at other positions without shear stud steel plate, it is necessary to it is mixed as pouring to install sheet metal
Coagulate the template of soil.
, can be by design requirement assembling reinforcement after upper mould installs.
8th, first time tensioning is carried out to steel suspension cable：After upper reinforcement colligation is complete, whole bridge is before casting concrete
Dead load it is all in place, at this moment, steel truss lower boom necessarily has certain tension, therefore steel suspension cable can be carried out for the first time
Tensioning, the transfer of first time lower edge pulling force is completed, and lower boom maximum crushing stress is occurred.
9th, top concrete, maintenance are poured, and treats that concrete strength reaches more than the 70% of design strength.
10th, second of tensioning is carried out to steel suspension cable：Because bridge top concrete accounts for most of weight of bridge again, because
This, after casting concrete, there is tension again in shaped steel lower edge, meanwhile, after on top, concrete reaches 70% intensity, concrete is
Pressure of winding up can be resisted, therefore, second of tensioning can be carried out at this moment, change the distribution of force of whole girder system, make lower edge
Pulling force is undertaken by steel suspension cable substantially, and pressure of winding up is undertaken by overlying concrete substantially.
11st, overlying bitumen layer, and seal tensioning anchor head position, such easy access and supplement tensioning with special cover plate.
Can tensioning once, ensures under all static loads of bridge that lower boom is in pressured state again after the bitumen layer of upper berth.
12nd, after the completion of last time tensioning, the keeper plate of steel outside anchor ring should be tightened, keeper plate of steel plays constraint steel strand wires folder
Piece, the effect for making intermediate plate not loosened when bridge shakes.
After the completion of overlying pitch, bridge can come into operation.
It is attached：The technical principle of interior suspension cable compound section bridge
The technical principle of interior suspension bridge is sketched by the example of following shaped steel suspension rod：
As shown in figure 1, weight（Weight is equal to G）Hung on first by shaped steel suspension rod on rigid frame, if the area of structural steel is
S, then produce tension in shaped steel：
бDraw= G/S
I.e. tension is directly proportional to weight weight in shaped steel, is inversely proportional with sectional area
Simultaneously because shaped steel is elastomer, after weight is hung, an elongation δ is hadL。
Wherein E is the modulus of elasticity of section steel material, and L is shaped steel length, and in the bridge of reality, the elongation of shaped steel can turn
Turn to the amount of deflection of bridge.
Then, it is close to shaped steel, separately plus a soft hoist cable plays weight（It is assumed that hoist cable suspension centre and shaped steel suspension centre are substantially at one
On vertical line, and all pass through the center of gravity of weight）, hoist cable upper end is provided with anchorage and screw, be able to will hung by rope top screw
Rope up carries.When hoist cable is just hung up, hoist cable is still undertaken by shaped steel completely in relaxed state, weight.
Loose hoist cable can gradually be tightened by tightening screw, so, some weight is transferred on hoist cable,
The weight that shaped steel undertakes is gradually decreased, and the elongation of shaped steel also gradually decreases, so, with constantly tightening hoist cable, we
Always the elongation of shaped steel can be reduced to zero, at this time, shaped steel no longer undertakes the weight of weight, and the weight of weight has been transferred to
Undertaken entirely by hoist cable.That is, it can complete the transfer of stress distribution by being tensioned hoist cable, stress be transferred to from shaped steel
On hoist cable.This is exactly the work to be done in the utility model：By the steel suspension cable in tensioning truss, by lower boom in truss and portion
Divide the tension of web member to be transferred to be undertaken by steel suspension cable.
After the carrying of shaped steel is reduced into zero completely, it can also continue to tighten hoist cable（It is assumed that hoist cable has enough intensity,
It will not be broken）, at this time, hoist cable can be tightened more, tension increase, therefore necessarily occur compression in shaped steel, with balance crane
Suo Duoyu pulling force, in the case where not considering shaped steel unstability, shaped steel can be pressurized to the maximum pressure of appearance by tightening hoist cable
Stress.Simultaneously as shaped steel becomes to be pressurized from tension, shaped steel becomes shortening from elongation when carrying weight originally（This
Bridge, which is correspond to, in actual bridge becomes arch from downwarp）, and because shaped steel allows maximum crushing stress to be equal to maximum hold
Perhaps tension（When not considering unstability）, therefore, shortening amount when shaped steel is compressed to maximum crushing stress is exactly equal to reach maximum
Elongation during tension.
After shaped steel is pressed to maximum crushing stress by hoist cable, consider again shaped steel suspension rod and carry suspension rod as a tension
Bearing capacity.
1st, suspension rod is in no initial load, in the case of also setting hoist cable without side, the element bearing capacity G of shaped steel suspension rod0：
G0=бmax·S
Wherein：S is shaped steel area of section, бmaxFor the maximum allowable tension and compression stress of shaped steel.
2nd, suspension rod is having initial load, in the case of setting hoist cable still without side, width more than bearing capacity now, i.e. component load-bearing
Power subtracts initial load.
Width G more than bearing capacity2=G0- G1
Herein, initial load G1In the bridge of reality, corresponding to the deadweight of bridge, it is seen then that due to initial load
In the presence of in the case of no hoist cable, the bearing capacity of component reduces.
3rd, suspension rod is having an initial load, while side sets hoist cable by the case of shaped steel pressure to maximum crushing stress, section steel suspended
The bearing capacity that bar still has is：
G3=（бPress max+бDraw max）×S=2бmax×S （бPressure=бDraw）
It can be seen that because hoist cable has shifted initial load, meanwhile, existing initial compression in shaped steel, therefore, newly increased load
Shaped steel is set to reach maximum tension stress, it is necessary to the initial compression of shaped steel first to be offset, as a result, Steel section member still has
Width is equal to twice of element bearing capacity more than some tensile capacities, and this adds one times equivalent to by the bearing capacity of Steel section member,
And do not have to also be included in initial load, this part of initial load, which has been transferred completely on hoist cable, to be undertaken（In view of actual bridge certainly
Weigh just very big to total load head more than 70%, the meaning of this load transfer）.
Additionally, it is contemplated that the deformed in tension of steel member, in the case of no hoist cable, one times of element bearing capacity G0, just will
Shaped steel has moved maximal tensility to, when considering the effect of initial load, actual newly increased load G0- G1（Initial load）, shaped steel
Reach maximal tensility（The maximum defluxion of this corresponding actual bridge）.And in the case of having hoist cable pre-tensioned, newly increased load needs
Reach twice of G0, shaped steel can just be pulled to maximal tensility, and this just illustrates, the rigidity of whole stress system considerably increases.
Here it is general principle of the present utility model, actively applies pulling force by steel suspension cable in truss, makes steel truss lower edge
Bar and tension web member are acted on by compressive pre-stress, and bridge gravity load is all undertaken by hoist cable, so, are both considerably increased
The bearing capacity of tension member, the rigidity of bridge is added again, it means that can design the steel truss bridge of more large span.
Claims (4)
- A kind of 1. interior suspension cable compound section bridge, it is characterised in that：It includes the left and right top boom 1 of horizontal structure, arcs of recesses knot The left and right lower boom of structure（5）, it is connected to top boom（1）, lower boom（5）Between vertical web member（8）And diagonal web member（10）, along a left side Bottom right chord member（5）At least twice steel suspension cable that cambered surface is respectively arranged（6）, and top boom is laid on by connector（1）Top surface Steel plate（2）With the concrete being cast on steel plate（4）, and be provided with steel plate for affixed concrete（4）Shearing resistance bolt Nail（3）.
- 2. interior suspension cable compound section bridge according to claim 1, it is characterised in that：The lower boom（5）For parabola Type structure, passes through gusset plate（7）With vertical web member（8）, diagonal web member（10）Connection；The steel suspension cable（6）By more non-binding steel Twisted wire ties up composition, steel suspension cable by thermoplastic PVC boundlings（6）Along lower boom（5）Arrangement, steel suspension cable（6）It is vertical by each Web member（8）During lower end, through arc fixture（9）With lower boom（5）Joint, form the parabolic type knot consistent with lower boom Structure.
- 3. interior suspension cable compound section bridge according to claim 1, it is characterised in that：The steel suspension cable（6）End according to It is secondary to pass through top boom（1）, steel plate（2）, steel anchoring part（14）, pass through anchor ring（15）It is fixed；The anchor ring（15）Include in steel Steel strand wires are clamped by root after suspension cable tensioning, to keep the intermediate plate of the stretching force of steel strand wires；The anchor ring top pressure has been provided with The keeper plate of steel of the effect of tight anchor ring inner clamp piece（16）, anchor ring is anchored on using connector（15）On.
- 4. interior suspension cable compound section bridge according to claim 2, it is characterised in that：The lower boom（5）, vertical web member （8）, diagonal web member（10）Gusset plate is connected to by high-strength bolt（7）On, the arc fixture（9）It is fixed on using connector On gusset plate；And the lower boom（5）, vertical web member（8）, diagonal web member（10）It is arranged symmetrically in gusset plate both sides, the arc Shape fixture（9）Equally it is divided into gusset plate（7）Both sides, twice steel suspension cable（6）Respectively from being divided into gusset plate（7）The arc of both sides Passed through in fixture, change an angle, and a parabolic type is integrally formed；The steel suspension cable（6）Twisted by more non-binding steel Line is tied up by thermoplastic PVC boundlings and formed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431112A (en) * | 2020-10-23 | 2021-03-02 | 浙江大学 | Assembled ground anchor through-type pedestrian cable bridge structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431112A (en) * | 2020-10-23 | 2021-03-02 | 浙江大学 | Assembled ground anchor through-type pedestrian cable bridge structure and construction method |
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