CN101550668A

CN101550668A - Design proposal for simple overpass

Info

Publication number: CN101550668A
Application number: CNA2008100355183A
Authority: CN
Inventors: 李克平; 倪颖; 孙剑; 钱红波; 江文平
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2008-04-02
Filing date: 2008-04-02
Publication date: 2009-10-07

Abstract

The invention belongs to the field of designing urban road traffic, in particular discloses a design proposal for a high-capacity and simple overpass suitable for crossed urban trunk roads. An underground or overground layer diversion crossing is built in the underground or overground layer space of the plane crossing of the urban trunk roads, an approach road leading to the underground or overground layer diversion crossing is arranged on a ground trunk road, main turning motor vehicle streams are led into the underground or overground layer diversion crossing by the approach road to go around a turn, and motor vehicle streams, foot passengers and bicycle streams, which go straight, are remained on the ground to move. The design proposal has the advantages of simple structure, high crossing passing efficiency, and the like.

Description

A kind of design scheme of simple overpass

Technical field

The invention belongs to field of designing urban road traffic, be specifically related to a kind of jumbo design scheme that is applicable to the simple overpass that the urban road arterial highway intersects.

Background technology

The big portion of the traffic bottlenecks of urban road network concentrates on level-crossing, according to statistics, at 50% of the not enough road intersection of the traffic capacity of city road network midplane intersection, vehicle accounts for 31% of omnidistance journey time in the time that level-crossing delays, simultaneously level-crossing also is the multiple point of traffic accident, and the traffic accident that takes place on urban road has and occurs in more than 60% in the level-crossing scope.Each motor vehicle that turns to of level-crossing road intersection, bicycle and pedestrian constantly produce intersection, interflow, shunting conflict in crossing.Simple two phase place control separates the traffic flow on two-phase dealings road from the time, but left turn traffic has a strong impact on the current of subtend craspedodrome wagon flow, the right-hand rotation wagon flow produces serious disturbance to craspedodrome bicycle and street pedestrian, not only reduce the traffic capacity of intersection, and had potential safety hazard; If conflicting traffic flow is separated from the time fully, just be necessary for left-hand rotation, the right-hand rotation motor vehicle is arranged independently phase place, though this can eliminate left turning vehicle to the interference to bicycle and pedestrian of through vehicles and right-hand rotation vehicle, the current order of standard intersection, but the increase of phase place causes the signal period to increase, the loss of signal time increases, intersection delay increases, the traffic capacity reduces, and the long signal period also can cause pedestrian's red light stand-by period to increase, and the pedestrians disobeying traffic rule rate also increases thereupon.In order to improve the traffic capacity of intersection, often adopt and widen the mode of entrance driveway, but in the urban road, often be subjected to the restriction of neighboring buildings, cost and the cost of widening the crossing inlet road are often very big, and wide intersection can cause the difficulty of pedestrian's street crossing again.

Graded crossing separates traffic conflict point from different aspects, be to solve level-crossing traffic conflict problem method the most completely, therefore occurred utilizing traffic interchange to replace the serious level-crossing of congested problem, solved the traffic design viewpoint of urban traffic congestion problem with this.But because the intersection is intensive in the city road network, cutout between the traffic flow of city road network belongs to, indivedual at grade intersections are set to graded crossing in city road network, easily cause the unmatched problem of the capable ability of continuous stream and Interrupted flow, therefore being provided with of grade separation must be coordinated mutually with peripheral intersection and road network condition in the city road network, otherwise only be that traffic pressure is transferred to contiguous intersection, the effect of grade separation can not get performance, just shifted the place of traffic congestion, and grade separation is favourable to the motor vehicle trip, but cause the pedestrian, the inconvenience of bicycle and transit trip, cause city function to be degenerated, it is big also to deposit floor space, cut apart the city, influence the block sunshine condition, obstruct the view, destroy view, problems such as reliability is relatively poor, therefore the effect of single grade separation in urban road network seems very little, replacing level-crossing fully by traffic interchange is infeasible to solve the urban road network traffic congested problem, and the traffic jam issue that solves urban road intersection must be sought new solution route.

Summary of the invention

Technical problem to be solved by this invention provides a kind of design scheme of simple in structure, simple overpass that traffic efficiency is high, to overcome defectives such as drawback that existing City road traffic system midplane intersection and traffic interchange exist and inadaptability.

The technical scheme of technical solution problem of the present invention is as follows:

A kind of design scheme of simple overpass, it is characterized in that: build underground (or on the ground) layer shunting intersection at underground (or on the ground) sheaf space of urban road arterial highway level-crossing, the ground major trunk roads are provided with and lead to leading the way of underground (or on the ground) layer shunting intersection, main steering box motor-car is flowed through to lead the way and is incorporated into underground (or on the ground) layer shunting intersection and finishes and turn to, and it is current that the motor-driven wagon flow of keeping straight on, pedestrian, bicycle flow are retained in ground.

By above disclosed technical scheme as can be known, simple overpass of the present invention is by being provided with a shunting intersection at underground (or on the ground) layer, making ground floor and underground (or on the ground) layer all is to be interrupted traffic flow, solved the problem of graded crossing and adjacent plane intersection capacity coupling, because ground floor has only the motor-driven wagon flow of craspedodrome of road intersection, adopt two phase control all conflict points can be separated from the time, reduce the level-crossing entrance driveway and widened required occupation of land, and shortened the signal period, reduced the required stand-by period of pedestrian's street crossing, eliminate conflicting between steering box motor-car stream and street pedestrian and the bicycle, improved the traffic capacity and the traffic safety of intersection; Underground (or on the ground) layer shunting intersection can be traffic circle or signalized crossing, and owing to there is not non-motor-driven and street pedestrian's interference, can reduce the delay of steering box motor-car stream, has improved the traffic efficiency of intersection.

Description of drawings

Fig. 1 always schemes for the design that bogie car stream is finished the simple overpass that turns to by the underground circular intersection;

Fig. 2 is a simple overpass ground floor plan among Fig. 1;

Fig. 3 is simple overpass underground (or on the ground) layer traffic circle plan among Fig. 1;

Fig. 4 is simple overpass underground (or on the ground) layer signal control intersection plan.

Among Fig. 1: 1 is traffic island, subterranean layer traffic circle; 2 is ground floor pedestrian's street crossing lateral road; 3 is ground floor craspedodrome motor vehicle import track; 4 lead the way for subterranean layer traffic circle steering box motor-car.

The specific embodiment

Further specify the present invention below in conjunction with accompanying drawing.

Shown in Fig. 1 to 4, the design scheme of simple overpass of the present invention, build underground (or on the ground) layer shunting intersection at underground (or on the ground) layer of urban road arterial highway level-crossing, the arterial highway, ground is provided with leads to leading the way of underground (or on the ground) layer shunting intersection, main steering box motor-car is flowed through to lead the way and is incorporated into underground (or on the ground) layer shunting intersection and finishes turning, and it is current that the motor-driven wagon flow of keeping straight on, pedestrian, bicycle flow are retained in ground.Main steering box motor-car comprises turning left or/and the motor vehicle of turning right.

Described shunting island is traffic island, traffic circle as shown in Figure 1, also can be signalized crossing as shown in Figure 4.

In particular cases, can allow motor bus, cart to realize on ground turning to.

Shown in Fig. 1～2, can be in crossing, turning roadway is arranged on the fast lane that major trunk roads keep left, and direct lane is arranged on the kerb lane that major trunk roads keep right.

In the concrete actual use, when the ratio that turns to the medium-and-large-sized car of wagon flow hour, can consider the large car of steering box motor-car is arranged in ground, utilize the gap of craspedodrome wagon flow to finish and turn to, can reduce the headroom requirement of underground intersection like this, reduce the construction costs of simple overpass.In addition, because the passing rules of simple overpass runs counter to the current underlying rule of conventional intersection, therefore must repeat twice at least in advance by identifier marking informs the driver, gives the chance that it is once made a mistake and corrects.Swarm into underground intersection in order to prevent that Overheight Vehicles from missing, must set up the limit for height facility at the ramp entrance place of underground intersection.Additionally descend the facilities such as illumination, draining and ventilation of shape intersection to be configured with reference to the construction standard in tunnel.

Each intersection plan of the present invention is to design by the vehicle current traffic rules of keeping right, and only needs change " right side " to " left side " into by current country, a left side at vehicle, " right side " is changed into " left side " get final product.

Claims

1. the design scheme of a simple overpass, it is characterized in that: build underground (or on the ground) layer shunting intersection at underground (or on the ground) layer of urban road arterial highway level-crossing, the arterial highway, ground is provided with leads to leading the way of underground (or on the ground) layer shunting intersection, main steering box motor-car is flowed through to lead the way and is incorporated into underground (or on the ground) layer shunting intersection and finishes and turn to, and it is current that the motor-driven wagon flow of keeping straight on, pedestrian, bicycle flow are retained in ground.

2. the design scheme of simple overpass according to claim 1 is characterized in that, described underground (or on the ground) layer shunting intersection is traffic circle or signalized crossing.

3. the design scheme of simple overpass according to claim 1 is characterized in that, under specific condition, can allow motor bus, cart to realize on ground turning to.

4. the design scheme of simple overpass according to claim 1 is characterized in that, described main steering box motor-car comprises turning left or/and the motor vehicle of turning right.