CN106120535A - Interior from anchor suspension bridge - Google Patents

Abstract

The present invention is open a kind of interior from anchor suspension bridge, is mainly made up of main push-towing rope, hoist cable, Sarasota, batter post, horizon bar, auxiliary pier and girder；The end of main push-towing rope is anchored on girder after walking around the bottom steering block III of the steering block II bottom the cable saddle at Sarasota top, the steering block I of horizon bar end, Sarasota, batter post successively；Batter post and horizon bar are separately positioned on the both sides of Sarasota, and have a common end points, and end points is located at the midpoint of Sarasota.Present invention eliminates bulky anchorage, decrease the computational length of the main push-towing rope connecting anchorage, make main push-towing rope stress and amplitude under dead load reduce；Sarasota basis walked around by cable, compared with the anchor suspension bridge of original place, decreases the Sarasota pressure to ground；Cable is fixed on girder, and girder provides axle dynamic balance cable part of horizontal component, improves suspension bridge wind resistance, reduces foundation level thrust simultaneously, reduce investment；Compared with from anchor suspension bridge, suspended span of the present invention is far longer than from anchor suspension bridge.

Description

Interior from anchor suspension bridge

Technical field

The invention belongs to a kind of suspension bridge, relate to one interior from anchor suspension bridge.

Background technology

Suspension bridge structure has that stress performance is good, span ability greatly, the most attractive in appearance, shock resistance is strong, version is various And landform is adapted to the features such as ability is good, when crossing over the hindrance to traffics such as great rivers, high mountain gorge, harbour, bay in many, Often as first-selected bridge type.Therefore, people also have devised multiple Suspension bridge structure.As Chinese Patent Application No. is 201510012845.7 suspension bridges disclosing a kind of high torsional rigidity, including girder, Sarasota, main push-towing rope and suspension rod, main push-towing rope is one Bar and be positioned at girder longitudinal center facade, suspension rod is distributed in girder both lateral sides for suspending girder in midair by main push-towing rope so that main push-towing rope, It is the structure of spatial triangle that suspension rod and girder form cross section；The present invention utilizes the stability of triangle, forms one and is similar to In triangle box-beam structure, fundamentally improve the overall torsional rigidity of suspension bridge and reverse shake frequency, directly improving under quiet wind and turn round Turn the critical wind velocity of unstability, reverse shake frequency and the ratio of vertical shake frequency it is also possible to increase, thus improve facing of electric shock Boundary's wind speed, also ensures that the safety of the suspension bridge of relatively large span；Further, do not increase the material of existing suspension bridge and become This, and it practice, main push-towing rope is one, cross-sectional area can be increased, and increase suspension rod quantity and cross-sectional area, increase torsion further Rigidity.And for example Chinese Patent Application No. is 200920043292.1 to disclose a kind of self-anchored suspension bridge, including Sarasota basis, rope Tower, cable saddle, stiff girder, main push-towing rope and suspension rod, be provided with concrete perfusion in empty steel pipe in described stiff girder and the steel pipe that formed mixes Solidifying soil combined member.Use concrete filled steel tube stiff girder, be possible not only to reduce cost, and easy construction, can substantially accelerate Construction speed.For another example Chinese Patent Application No. is 201120102496.5 to disclose a kind of bridge structure, include runway beam, Bridge tower, anchorage, weight cable, is characterized in that, weight cable is combined by a main rope and Duo Gen rope, from Sarasota, Keep at a certain distance away and several ropes are separated from weight cable, be connected with track beam, at the secondary rope separation on weight cable It is provided with a point cable device.Weight cable is made up of with main rope secondary rope, and with fixture combination together；Cable utensil is divided to have secondary rope from load-bearing master The inner chamber of cable separation shape, and have clamp device, can be fixed on weight cable；The structure of the present invention can optimize suspension bridge The stress of weight cable, saves material.

But at the earth anchored suspension bridge of generally conventional formula, needing to build bulky anchorage to anchor main push-towing rope, this is just Causing the place in geological condition difference, the foundation engineering amount of anchorage structures is very big, often becomes the difficult point of engineering；Ground anchor type hangs Cable bridge anchorage and Anchor Foundation occupy the considerable part of construction costs, become the important side affecting Suspension bridge structure economy Face；In urban area or tourist district, build bulky anchorage, environmental beauty also can be had a negative impact.

Summary of the invention

For the problems referred to above, invention provides one interior from anchor suspension bridge, by setting up horizon bar at Sarasota two ends And batter post, make main push-towing rope walk around bottom Sarasota top cable saddle, horizon bar end steering block I, Sarasota bottom steering block II, batter post successively It is fixed on girder after steering block III.Act on the load on girder and follow following Path of Force Transfer: girder → hoist cable → master Cable → bridge tower → horizon bar → Sarasota basis → inclined column foundation → wraparound girder.Cable is walked around Sarasota basis, reduces Sarasota Foundation pressure；Cable is fixed on girder, increases girder axle power, improves suspension bridge wind resistance；Owing to setting up batter post Thus increase the lateral rigidity of tower.Compared with earth anchor suspension bridge, eliminate bulky anchorage；With from anchor suspension bridge phase Ratio, interior is far longer than from anchor suspension bridge from anchor suspended span, can reach or exceed the span of earth anchor suspension bridge.

The present invention takes techniques below scheme to be attained in that

From anchor suspension bridge in a kind of, mainly by main push-towing rope, hoist cable, Sarasota, batter post, horizon bar, girder and girder auxiliary pier group Become；Described hoist cable is evenly arranged between main push-towing rope and girder；Described Sarasota is located at the two ends of girder；Described batter post and water Flat bar is separately positioned on the both sides of Sarasota, and has the end of a common end points, i.e. batter post and horizon bar to be in same water On horizontal line, end points is located at the midpoint of Sarasota；It is provided with steering block I in the end of horizon bar；It is provided with cable saddle, Sarasota at the top of Sarasota Bottom poured basis II and be provided with steering block II；Pour basis I in the bottom of batter post and be provided with steering block III；Described Girder auxiliary pier be located at the two ends of girder, and the top braces girder of girder auxiliary pier, bottom is in bottom Sarasota and tiltedly Between column bottom；The end of described main push-towing rope is walked around at the bottom of the cable saddle at Sarasota top, the steering block I of horizon bar end, Sarasota successively The steering block II in portion, batter post bottom steering block III after be fixedly mounted on girder and girder auxiliary pier junction.

Further illustrating, described main push-towing rope is provided with scattered cable saddle at basic I.

Further illustrating, described two ends, left and right, Sarasota top main push-towing rope within angle α become with Sarasota is equal and is less than 180 °.

Further illustrating, the inner clip angle beta that described horizon bar upper and lower two ends main push-towing rope is formed with horizon bar is equal and is less than 180°。

Further illustrating, described batter post and/or horizon bar use steel construction lattice column form or steel case or coagulation Soil box is made.When using steel construction lattice column form or steel case, can effectively reduce horizon bar and batter post deadweight.

In the present invention, when geological state is preferable, can directly use shallow foundation；When geological state is general, bottom batter post Batter piling；When geological state is poor, stake and the cushion cap connecting stake top squeezed into by many roots or sink in soil need to be made and constituted Basis；

In the present invention, main push-towing rope is the main supporting member of this individual system, is primarily subjected to pulling force；Hoist cable rise connection girder and The effect of main push-towing rope, is only the component transmitting load, and the load such as girder, bridge deck and mobile load passes to main push-towing rope by hoist cable；Sarasota rises Support the effect of main push-towing rope, be primarily subjected to pressure；Suo Li is passed to Sarasota and batter post, Sarasota and batter post and power is reached base by horizon bar Plinth.From anchor suspension bridge, cable is walked around Sarasota basis in disclosed by the invention, reduce Sarasota foundation pressure；Cable is anchored at master Liang Shang, increases girder axle power, improves suspension bridge wind resistance；Simultaneously because set up batter post thus increase the lateral rigidity of tower. Compared with earth anchor suspension bridge, eliminate bulky anchorage, good economy performance；Compared with from anchor suspension bridge, interior from anchor suspension bridge Span is far longer than from anchor suspension bridge, can reach or exceed the span of earth anchor suspension bridge.

Advantages of the present invention:

1. the present invention is as a kind of new system suspension bridge, it is not necessary to huge anchor pyridine, and easy construction shortens the construction period, warp Ji property is good.

2., by setting up horizon bar and batter post, cable is walked around Sarasota basis, reduces Sarasota foundation pressure.

3. cable is anchored on girder, increases girder axle power, improves suspension bridge wind resistance.

4., by the supporting role of batter post, increase the lateral rigidity of Sarasota.

5. due to horizon bar, main push-towing rope is divided into upper and lower two parts, compared with earth anchor suspension bridge, decreases connection anchorage section master The computational length of cable, thus reduce stress and the amplitude of main push-towing rope under dead load.

Accompanying drawing explanation

Fig. 1 is interior from the elevation of anchor suspension bridge.

Fig. 2 is interior from the force analysis figure of anchor suspension bridge

In figure: 1-main push-towing rope；2-hoist cable；3-Sarasota；4-batter post；5-horizon bar；6-cable saddle；7-steering block I；8-dissipates cable saddle； 9-basis I；10-girder；11-basis II；12-steering block II；13-horizon bar auxiliary pier, 14-steering block III, 15-girder assist Pier.

Detailed description of the invention

In conjunction with Fig. 1-2, the mechanics principle of the present invention is illustrated:

Mechanics principle:

In from anchor suspension bridge stress as in figure 2 it is shown, G₁、G₂、G₃Being three basis gravity, S is cable tension, X₁、X₂Based on Horizontal direction institute stress, Y₁、Y₂、Y₂Based on power suffered by vertical direction, f is sliding frictional force, and α is the folder of cable and Sarasota Angle, H is Sarasota height, and γ is the angle of cable and ground level, and β is the angle of batter post and ground level, N₀For girder axle power, N is Tiltedly column axial force, is analyzed as follows:

1. analysis node 0₄

If Fig. 2 main beam design axle power is N₀, then vertically made a concerted effort by node and horizontal resultant balance:

S cos γ=N₀ (1)

Can be released by (1) formula:

$\mathrm{\γ}=arccos\frac{N_0}{S}---\left(2\right)$

The corner dimension of cable and girder is may determine that by (2).

2. Foundation pressure

As in figure 2 it is shown, by node 0₅Vertical balance:

Y₃=S sin γ+G₃ (3)

Vertical counter-force Y of substrate of girder auxiliary pier can be calculated by (3) formula₃, its substrate horizontal reacting force is 0.

As in figure 2 it is shown, by O₁Knee level direction is made a concerted effort knowable to balance:

∑F_x=0, X₁+S sinα-S+f₁=0 (4)

Can be released by (4) formula:

X₁=S (1-sin α)-f₁ (5)

Made a concerted effort to balance by integral level direction:

∑ Fx=0, X₂+X₁+N₀+ f=S sin α (6)

Can be released by (6) formula:

X₂=S (2sin α-1)-N₀-f₂ (7)

Wherein,

f₁+f₂=f

To O₂Point equalising torque:

$\begin{array}{c}\ΣM_{O2}=0,\\ Y_1\·L+S\·sin\mathrm{\α}\·H+Y_3\frac{h}{\tan \mathrm{\γ}}-S\·\cos \mathrm{\α}\·L-G_{1}L-N_{0}h-G_3\frac{h}{\tan \mathrm{\γ}}=0\end{array}---\left(8\right)$

Can be released by (8) formula, (3) formula:

$Y_1=S\·cos\mathrm{\α}+G_1-\frac{SH}{L}sin\mathrm{\α}---\left(9\right)$

To O₁Point equalising torque:

$\begin{array}{c}\ΣM_{O1}=0,\\ Y_{2}L+N_{0}h+Y_3(L-\frac{h}{\tan \mathrm{\γ}})-G_{2}L-SH\·\sin \mathrm{\α}-G_3(L-\frac{h}{\tan \mathrm{\γ}})=0\end{array}---\left(10\right)$

Can be released by (10) formula:

$Y_2=G_2+S\frac{H}{L}\·sin\mathrm{\α}-N_{0}tan\mathrm{\γ}---\left(11\right)$

Foundation pressure X can be obtained by (5) formula, (7) formula, (9) formula, (11) formula₁, Y₂, X₁, Y₂。

3.G₁Critical determination

Take Foundation pressure Y₁>=0, according to (9) formula:

$Y_1=S\·cos\mathrm{\α}+G_1-Ssin\mathrm{\α}\·\frac{H}{L}\≥0---\left(12\right)$

Can be released by (12) formula:

$G_1\≥Ssin\mathrm{\α}\·\frac{H}{L}-S\·cos\mathrm{\α}---\left(13\right)$

Substrate gravity G is may determine that by (13) formula₁Marginal value, it is ensured that Sarasota will not be pulled up.

4. node O₃Horizontal direction makes a concerted effort to balance

As in figure 2 it is shown, node O₃Horizontal direction makes a concerted effort to balance:

N cos β=2S sin α (14)

In formula:

$cos\mathrm{\β}=\frac{2L}{\sqrt{4L^2+H^2}}$

Can be released by (14) formula:

$N=\frac{Ssin\mathrm{\α}\sqrt{4L^2+H^2}}{L}---\left(15\right)$

The value of N can be obtained by (15) formula.

Comprehensive described, in the case of ignoring king-post, horizon bar, batter post, auxiliary pier deadweight, structural member is the most axially pressed Power.There are nine fundamental unknown variables in computation model, including: X₁、Y₁、X₂、Y₂、Y₃、f、L、N、γ、N₀；Total formula (1), (3), formula (4), formula (6), formula (8), formula (10), (14) eight relational expressions of formula；Fundamental unknown variables f, L, N, N₀For undetermined parameter, according to reality Design requirement sets f, L, N, N₀In four parameters, any three parameter values, can calculate remaining parameter value according to relational expression.

With embodiment, the structure of the present invention is designed further description below in conjunction with the accompanying drawings.

Embodiment 1:

It is identical that the interior span layout from anchor suspension bridge of the present embodiment all raises the Yangtze Bridge with profit.As it is shown in figure 1, in a kind of From anchor suspension bridge, mainly it is made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5, girder 10 and girder auxiliary pier 15；Institute The hoist cable 2 stated is evenly arranged between main push-towing rope 1 and girder 10；Described Sarasota 3 is located at the two ends of girder 10；Described batter post 4 With the both sides that horizon bar 5 is separately positioned on Sarasota 3, and have at end and the horizon bar 5 of a common end points, i.e. batter post 4 On same level line, end points is located at the midpoint of Sarasota 3；It is provided with steering block I 7 in the end of horizon bar 5；Top at Sarasota 3 Being provided with cable saddle 6, the bottom of Sarasota 3 has poured basis II 11 and has been provided with steering block II 12；Basis I 9 is poured in the bottom of batter post 4 And it is provided with steering block III 14；Described girder auxiliary pier 15 is located at the two ends of girder 10, and the top of girder auxiliary pier 15 Support girder 10, bottom be in bottom Sarasota 3 and bottom batter post 4 between；The end of described main push-towing rope 1 is walked around Sarasota 3 successively and is pushed up Steering block II 12 bottom the cable saddle 6 in portion, the steering block I 7 of horizon bar 5 end, Sarasota 3, the bottom steering block III 14 of batter post 4 After, finally it is anchored on girder 10 and girder auxiliary pier 15 junction.

Described main push-towing rope 1 is provided with scattered cable saddle 8 at basis I 9.Described two ends, left and right, Sarasota 3 top main push-towing rope 1 and Sarasota 3 become within angles α are equal and are less than 180 °.The inner clip angle beta that described horizon bar about 5 two ends main push-towing rope 1 is formed with horizon bar 5 Equal and less than 180 °.Described batter post 4 and horizon bar 5 use steel construction lattice column form to make.Set in the end of horizon bar 5 There is auxiliary pier 13.

According to conventional design, huge anchorage and deep foundation need to be set, be computed, raise the Yangtze Bridge with profit compared with, save Having removed anchorage, this expense i.e. saves 2.5 hundred million yuan.In from anchor suspension bridge owing to setting up auxiliary pier, horizon bar, batter post, this expense is 0.8 hundred million.Therefore, compared with the common greatly earth anchor bridge suspension bridge in river of making the best use of the advantages with profit, interior saved altogether 1.7 hundred million from anchor suspension bridge.In simultaneously Reducing 45% from anchor Suspension Bridge Tower axle power, Sarasota lateral rigidity improves 19.8%, and the duration reduces 12 months.

Embodiment 2:

The interior of the present embodiment is arranged all identical with the Wufeng Mount Yangtze Bridge from the span of anchor suspension bridge.From anchor suspension cable in a kind of Bridge, is mainly made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5, girder 10 and girder auxiliary pier 15；Described hoist cable 2 It is evenly arranged between main push-towing rope 1 and girder 10；Described Sarasota 3 is located at the two ends of girder 10；Described batter post 4 and horizon bar 5 It is separately positioned on the both sides of Sarasota 3, and has the end of a common end points, i.e. batter post 4 and horizon bar 5 to be in same level On line, end points is located at the midpoint of Sarasota 3；It is provided with steering block I 7 in the end of horizon bar 5；It is provided with cable saddle 6 at the top of Sarasota 3, The bottom of Sarasota 3 has poured basis II 11 and has been provided with steering block II 12；Pour in the bottom of batter post 4 basis I 9 and be provided with turn To block III 14；Described girder auxiliary pier 15 is located at the two ends of girder 10, and the top braces girder 10 of girder auxiliary pier 15, Bottom be in bottom Sarasota 3 and bottom batter post 4 between；The end of described main push-towing rope 1 walks around the cable saddle 6 at Sarasota 3 top, water successively After steering block II 12 bottom the steering block I 7 of flat bar 5 end, Sarasota 3, the bottom steering block III 14 of batter post 4, finally it is anchored at On girder 10 and girder auxiliary pier 15 junction.

Described main push-towing rope 1 is provided with scattered cable saddle 8 at basis I 9.Described two ends, left and right, Sarasota 3 top main push-towing rope 1 and Sarasota 3 become within angles α are equal and are less than 180 °.The inner clip angle beta that described horizon bar about 5 two ends main push-towing rope 1 is formed with horizon bar 5 Equal and less than 180 °.Described batter post 4 and horizon bar 5 use steel case to make.It is provided with auxiliary pier 13 in the end of horizon bar 5.

According to conventional design, huge anchorage and deep foundation need to be set, be computed, compared with the Yangtze Bridge of Wufeng Mount, Setting up horizon bar, batter post, auxiliary pier, eliminate anchorage, interior save 18% from anchor suspension bridge, Sarasota axle power reduces 55%, Sarasota Lateral rigidity improves 26.2%, and the excavation of foundation pit degree of depth reduces 25m, and the duration reduces 15 months.

Embodiment 3:

The interior of the present embodiment is arranged all identical with yangtze river in nanjing four bridge from the span of anchor suspension bridge.From anchor suspension cable in a kind of Bridge, is mainly made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5, girder 10 and girder auxiliary pier 15；Described hoist cable 2 It is evenly arranged between main push-towing rope 1 and girder 10；Described Sarasota 3 is located at the two ends of girder 10；Described batter post 4 and horizon bar 5 It is separately positioned on the both sides of Sarasota 3, and has the end of a common end points, i.e. batter post 4 and horizon bar 5 to be in same level On line, end points is located at the midpoint of Sarasota 3；It is provided with steering block I 7 in the end of horizon bar 5；It is provided with cable saddle 6 at the top of Sarasota 3, The bottom of Sarasota 3 has poured basis II 11 and has been provided with steering block II 12；Pour in the bottom of batter post 4 basis I 9 and be provided with turn To block III 14；Described girder auxiliary pier 15 is located at the two ends of girder 10, and the top braces girder 10 of girder auxiliary pier 15, Bottom be in bottom Sarasota 3 and bottom batter post 4 between；The end of described main push-towing rope 1 walks around the cable saddle 6 at Sarasota 3 top, water successively After steering block II 12 bottom the steering block I 7 of flat bar 5 end, Sarasota 3, the bottom steering block III 14 of batter post 4, finally it is anchored at On girder 10 and girder auxiliary pier 15 junction.

Described main push-towing rope 1 is provided with scattered cable saddle 8 at basis I 9.Described two ends, left and right, Sarasota 3 top main push-towing rope 1 and Sarasota 3 become within angles α are equal and are less than 180 °.The inner clip angle beta that described horizon bar about 5 two ends main push-towing rope 1 is formed with horizon bar 5 Equal and less than 180 °.Described batter post 4 and horizon bar 5 use steel construction lattice column form to make.Set in the end of horizon bar 5 There is auxiliary pier 13.

According to conventional design, huge anchorage and deep foundation need to be set, be computed, compared with yangtze river in nanjing four bridge, save Having removed anchorage, this expense i.e. saves 4.6 hundred million yuan.In from anchor suspension bridge owing to setting up auxiliary pier, horizon bar, batter post, this expense is 1.6 hundred million.Therefore, compared with the common greatly earth anchor bridge suspension bridge in river of making the best use of the advantages with profit, interior saved altogether 200,000,000 from anchor suspension bridge.In simultaneously certainly Anchor Suspension Bridge Tower axle power reduces 45.5%, and Sarasota lateral rigidity improves 28.6%, and the duration reduces 10 months.

Embodiment 1～3 technical parameter contrast table

	Expense saves (hundred million yuan)	Sarasota axle power subtracts (%)	Sarasota lateral rigidity (%)	Duration shortens (moon)
					Embodiment 1	1.7	45.7	19.8	12
Embodiment 2	8.4	55.1	26.2	15
					Embodiment 3	4.6	48.2	28.6	10

Claims (6)

1. from anchor suspension bridge in one kind, it is characterised in that: main by main push-towing rope (1), hoist cable (2), Sarasota (3), batter post (4), level Bar (5), girder (10) and girder auxiliary pier (15) composition；Described hoist cable (2) be evenly arranged in main push-towing rope (1) and girder (10) it Between；Described Sarasota (3) is located at the two ends of girder (10)；Described batter post (4) and horizon bar (5) are separately positioned on Sarasota (3) Both sides, and have a common end points, i.e. end and the horizon bar (5) of batter post (4) is on same level line, and end points sets Midpoint in Sarasota (3)；It is provided with steering block I (7) in the end of horizon bar (5)；It is provided with cable saddle (6) at the top of Sarasota (3), The bottom of Sarasota (3) has poured basis II (11) and has been provided with steering block II (12)；Basis I (9) is poured in the bottom of batter post (4) And it is provided with steering block III (14)；Described girder auxiliary pier (15) is located at the two ends of girder (10), and girder auxiliary pier (15) top braces girder (10), bottom is between Sarasota (3) bottom and batter post (4) bottom；The end of described main push-towing rope (1) Portion walks around the cable saddle (6) at Sarasota (3) top, the steering block I (7) of horizon bar (5) end, the steering block of Sarasota (3) bottom successively II (12), it is fixedly mounted on girder (10) and girder auxiliary pier (15) junction after the bottom steering block III (14) of batter post (4).

From anchor suspension bridge in the most according to claim 1, it is characterised in that: described main push-towing rope (1) is around to I (9) place, basis It is provided with scattered cable saddle (8).

From anchor suspension bridge in the most according to claim 1, it is characterised in that: described Sarasota (3) left and right, top two ends master Cable (1) is equal with Sarasota (3) become within angle α and is less than 180 °.

From anchor suspension bridge in the most according to claim 1, it is characterised in that: described horizon bar (5) two ends main push-towing rope up and down (1) equal with the inner clip angle beta that horizon bar (5) is formed and less than 180 °.

From anchor suspension bridge in the most according to claim 1, it is characterised in that: described batter post (4) and/or horizon bar (5) Steel construction lattice column form or steel case or concrete box type is used to make.

From anchor suspension bridge in the most according to claim 1, it is characterised in that: it is provided with auxiliary pier in the end of horizon bar (5) (13).