CN106120534A - Interior earth anchor suspension bridge - Google Patents

Abstract

The invention discloses earth anchor suspension bridge in one, be mainly made up of main push-towing rope, hoist cable, Sarasota, batter post, horizon bar and girder；Described batter post and horizon bar are separately positioned on the both sides of Sarasota, and have the end of a common end points, i.e. batter post and horizon bar to be on same level line, and end points is located at the midpoint of Sarasota；It is provided with steering block I in the end of horizon bar；Being provided with cable saddle at the top of Sarasota, the bottom of Sarasota has poured basis II and has been provided with steering block II；Basis I is poured in the bottom of batter post；The end of described main push-towing rope is walked around the steering block II bottom the cable saddle at Sarasota top, the steering block I of horizon bar end, Sarasota successively and is fixedly mounted on basis I.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；Compared with from anchor suspension bridge, interior earth anchor suspended span is far longer than from anchor suspension bridge.

Description

Interior earth anchor suspension bridge

Technical field

The invention belongs to a kind of suspension bridge, relate to earth anchor suspension bridge in one.

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 earth anchor suspension bridge in one, by setting up horizon bar at Sarasota two ends And batter post, make main push-towing rope walk around steering block bottom Sarasota top cable saddle, horizon bar end steering block, Sarasota successively and be anchored to base Plinth.Act on the load on girder and follow following Path of Force Transfer: girder → hoist cable → main push-towing rope → bridge tower → basis.Cable is anchored On the basis of Sarasota, reduce the axle power of Sarasota, simultaneously because set up batter post thus increase the lateral rigidity of tower.Hang with earth anchor Cable bridge is compared, and eliminates bulky anchorage, decreases the computational length of the main push-towing rope connecting anchorage, makes main push-towing rope at dead load Lower stress and amplitude reduce；Compared with from anchor suspension bridge, interior earth anchor suspended span is far longer than from anchor suspension bridge, can reach with The span that earth anchor suspension bridge is identical.

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

Earth anchor suspension bridge in a kind of, is mainly made up of main push-towing rope, hoist cable, Sarasota, batter post, horizon bar and girder；Described hangs Rope is evenly arranged between main push-towing rope and girder；Described Sarasota is located at the two ends of girder；Described batter post and horizon bar set respectively Put the both sides at Sarasota, and have the end of a common end points, i.e. batter post and horizon bar to be on same level line, end points It is located at the midpoint of Sarasota；It is provided with steering block I in the end of horizon bar；Being provided with cable saddle at the top of Sarasota, the bottom of Sarasota pours There is basis II and be provided with steering block II；Basis I is poured in the bottom of batter post；The end of described main push-towing rope walks around Sarasota top successively Steering block II bottom the cable saddle in portion, the steering block I of horizon bar end, Sarasota is fixedly mounted on basis I.

Further illustrating, the end of 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 horizon bar all use steel construction lattice column form to make.Use steel construction lattice Structure cylindricality formula, can effectively reduce horizon bar and batter post deadweight.Described batter post and/or horizon bar can also use steel case or Person's concrete box type is made.

In the present invention, for limit levels boom end amount of deflection, technical scheme can be optimized further: i.e. exist The end of horizon bar is provided with auxiliary pier.

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.Interior earth anchor suspension bridge disclosed by the invention is by arranging horizon bar and batter post, by cable On the basis of rope is anchored at Sarasota, reduce the axle power of Sarasota, simultaneously because set up batter post thus increase the lateral rigidity of tower.With Earth anchor suspension bridge is compared, and eliminates bulky anchorage, decreases the computational length of the main push-towing rope connecting anchorage, makes main push-towing rope in perseverance Under load effect, stress and amplitude reduce；Compared with from anchor suspension bridge, interior earth anchor suspended span is far longer than from anchor suspension bridge.

Advantages of the present invention:

1. by setting up horizon bar and batter post, and main push-towing rope is anchored to Sarasota basis, eliminates anchorage and reduce Sarasota Axle power.

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

3. 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 the elevation of interior earth anchor suspension bridge.

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

Fig. 3 is to remove the elevation of earth anchor suspension bridge in auxiliary pier.

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-auxiliary pier.

Detailed description of the invention

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

Force principle:

Interior earth anchor suspension bridge stress is as in figure 2 it is shown, G₁、G₂Being two basis gravity, S is cable tension, X₁、X₂Based on water Square to institute's stress, Y₁、Y₂Based on power suffered by vertical direction, f is sliding frictional force, and α is the angle of cable and Sarasota, and H is Sarasota height, β is the angle of batter post and ground level, and N is oblique column axial force, wherein:

1. Foundation pressure:

By O₁Knee level direction is made a concerted effort knowable to balance:

∑F_x=0, f₁+X₁+ S sin α-S=0 (1)

Can be released by (1) formula:

X₁=S-S sin α-f₁ (2)

Made a concerted effort to balance by integral level direction:

∑F_x=0, X₁+X₂+ f=S sin α (3)

Can be released by (3) formula:

X₂=2 Ssin α-S-f₂ (4)

To O₂Point equalising torque:

∑M_O2=0, G₁·L-Y₁L-S sin α H+S cos α L=0 (5)

Can be released by (5) formula:

$Y_1=G_1-S\·sin\mathrm{\α}\·\frac{H}{L}+S\·cos\mathrm{\α}---\left(6\right)$

To O₁Point equalising torque:

$\ΣM_{O_1}=0,---\left(7\right)$

Y₂L-G₂L-SH sin α=0

Can be released by (7) formula:

$Y_2=G_2+S\·sin\mathrm{\α}\frac{H}{L}---\left(8\right)$

The Foundation pressure of interior earth anchor suspension bridge can be obtained by (2) formula, (4) formula, (6) formula, (8) formula.

2.G₁The determination of marginal value

Take Foundation pressure Y₁>=0, to ensure that basis is not pulled up, according to (7) formula:

$G_1-S\·\sin \mathrm{\α}\·\frac{H}{L}+S\·cos\mathrm{\α}\≥0---\left(9\right)$

Can be released by (11) formula:

$G_1\≥S\·\frac{H}{L}\·sin\mathrm{\α}-S\·cos\mathrm{\α}---\left(10\right)$

Can be with G by (10) formula₁Marginal value.

3.O₃Knee level dynamic balance

Equation can be balanced by Fig. 2, it may be assumed that

N cos β=2S sin α (11)

In formula:

$cos\mathrm{\β}=\frac{2L}{\sqrt{4L^2+H^2}}---\left(12\right)$

(11) formula is brought into by (12) formula:

$N=2S\·sin\mathrm{\α}\·\frac{\sqrt{H^2/4+L^2}}{L}---\left(13\right)$

Axle power N can be obtained by (13).

In sum, in the case of ignoring king-post, horizon bar, batter post deadweight, structural member is only by axial compressive force.This knot There are seven fundamental unknown variables in the computation model of structure, including: X₁、Y₁、X₂、Y₂、f、L、N；Total formula (1), formula (3), formula (5), formula (7), (11) five relational expressions of formula；Fundamental unknown variables f, L, N are three undetermined parameters, according to actual design requirements set f, L, N Two parameters in three parameter values, can extrapolate remaining parameter value according to relational expression.

Compared with conventional suspension bridge, Foundation pressure is greatly reduced, and therefore the requirement to basis reduces, and can make shallow foundation shape Formula.

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 span layout of the interior earth 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 Earth anchor suspension bridge, is mainly made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5 and girder 10；Described hoist cable 2 is uniform It is 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 are respectively It is arranged 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 line On, 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, rope at the top of Sarasota 3 The bottom of tower 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；Described main push-towing rope 1 To walk around steering block bottom the cable saddle 6 at Sarasota 3 top, the steering block I 7 of horizon bar 5 end, Sarasota 3 II 12 successively solid in end Dingan County is contained on basis I 9.

The end of 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 Within angle α become with Sarasota 3 is equal and is less than 180 °.Described horizon bar about 5 two ends main push-towing rope 1 and horizon bar 5 are formed Inner clip angle beta is equal and is less than 180 °.Described batter post 4 and horizon bar 5 all use steel construction lattice column form to make.At horizon bar The end of 5 is provided with 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, by In eliminating anchorage, this expense i.e. saves 2.9 hundred million yuan, and Sarasota axle power reduces 51.8%, and Sarasota lateral rigidity improves 21.3%, work Phase reduces 10 months.

Embodiment 2:

The span of the interior earth anchor suspension bridge of the present embodiment is arranged all identical with the Wufeng Mount Yangtze Bridge.As it is shown on figure 3, it is a kind of Interior earth anchor suspension bridge, is mainly made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5 and girder 10；Described hoist cable 2 is equal Even it is 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 points It is not arranged 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 line On, 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, rope at the top of Sarasota 3 The bottom of tower 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；Described main push-towing rope 1 To walk around steering block bottom the cable saddle 6 at Sarasota 3 top, the steering block I 7 of horizon bar 5 end, Sarasota 3 II 12 successively solid in end Dingan County is contained on basis I 9.

The end of 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 Within angle α become with Sarasota 3 is equal and is less than 180 °.Described horizon bar about 5 two ends main push-towing rope 1 and horizon bar 5 are formed Inner clip angle beta is equal and is less than 180 °.Described batter post 4 and horizon bar 5 all use steel case to make.

According to conventional design, huge anchorage and deep foundation need to be set, be computed, compared with the Yangtze Bridge of Wufeng Mount, Owing to eliminating anchorage, this expense i.e. saves 20%, and Sarasota axle power reduces 48.8%, and Sarasota lateral rigidity improves 20.1%, base Hole cutting depth reduces 20m, and the duration reduces 9 months.

Embodiment 3:

The span of the interior earth anchor suspension bridge of the present embodiment is arranged all identical with yangtze river in nanjing four bridge.As it is shown in figure 1, in a kind of Earth anchor suspension bridge, is mainly made up of main push-towing rope 1, hoist cable 2, Sarasota 3, batter post 4, horizon bar 5 and girder 10；Described hoist cable 2 is uniform It is 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 are respectively It is arranged 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 line On, 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, rope at the top of Sarasota 3 The bottom of tower 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；Described main push-towing rope 1 To walk around steering block bottom the cable saddle 6 at Sarasota 3 top, the steering block I 7 of horizon bar 5 end, Sarasota 3 II 12 successively solid in end Dingan County is contained on basis I 9.

The end of 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 Within angle α become with Sarasota 3 is equal and is less than 180 °.Described horizon bar about 5 two ends main push-towing rope 1 and horizon bar 5 are formed Inner clip angle beta is equal and is less than 180 °.Described batter post 4 and horizon bar 5 all use steel construction lattice column form to make.At horizon bar The end of 5 is provided with 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, by In eliminating anchorage, this expense i.e. saves 4.3 hundred million, and Sarasota axle power reduces 52.3%, and Sarasota lateral rigidity improves 30.2%, foundation ditch Cutting depth reduces 20m, and the duration reduces 12 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	2.9	51.8	21.3	10
Embodiment 2	3.2	48.8	20.1	9
					Embodiment 3	4.3	52.3	30.2	12

Claims (6)

1. earth anchor suspension bridge in a kind, it is characterised in that: main by main push-towing rope (1), hoist cable (2), Sarasota (3), batter post (4), level Bar (5) and girder (10) composition；Described hoist cable (2) is evenly arranged between main push-towing rope (1) and girder (10)；Described Sarasota (3) two ends of girder (10) it are located at；Described batter post (4) and horizon bar (5) are separately positioned on the both sides of Sarasota (3), and have End and the horizon bar (5) of one common end points, i.e. batter post (4) are on same level line, and end points is located in Sarasota (3) Point；It is provided with steering block I (7) in the end of horizon bar (5)；Cable saddle (6), the bottom of Sarasota (3) it is provided with at the top of Sarasota (3) Pour basis II (11) and be provided with steering block II (12)；Basis I (9) is poured in the bottom of batter post (4)；Described main push-towing rope (1) end is walked around bottom the cable saddle (6) at Sarasota (3) top, the steering block I (7) of horizon bar (5) end, Sarasota (3) successively Steering block II (12) is fixedly mounted on basis I (9).

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

Interior earth anchor suspension bridge 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 °.

Interior earth anchor suspension bridge 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 °.

Interior earth anchor suspension bridge the most according to claim 1, it is characterised in that: described batter post (4) and horizon bar (5) are all adopted Make with steel construction lattice column form or steel case or concrete box type.

Interior earth anchor suspension bridge 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).