CN2611422Y

CN2611422Y - Through type M-shape intermediate low point intersection viaduct

Info

Publication number: CN2611422Y
Application number: CN 03227230
Authority: CN
Inventors: 胡凤仪
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-21
Filing date: 2003-03-21
Publication date: 2004-04-14
Anticipated expiration: 2013-03-21

Abstract

The utility model relates to a straight-through M-shaped mid-point low overpass, which is characterized in that the shape of the longitudinal section of the bridge floor of one road is shape that is similar to M that is constructed by two parabolic segments, the shape of the longitudinal section of the bridge floor of the other rode is parabolic-segment-shaped, the two roads are convergent presenting cross shape, wherein the mid-point, also the highest point of the parabolic-segment-shape is the lowest is convergent with the mid-point, also the lowest point. The utility model reduces the height of the pillars of the overpass, cuts down the length of the overpass, thereby reducing the construction cost and making the traffic lane of the left turn flat.

Description

The low spot overpass bridge that crosses in the middle of the straight M shape

One, technical field:

The utility model relates in the middle of a kind of straight M shape low spot overpass bridge that crosses.The graded crossing design field that belongs to road.

Two, background technology:

In order to alleviate road traffic contradiction, build overpass bridge in the city in a large number, it is linear that the overpass bridge of building now is generally the double-paraboloid of right-angled intersection, both the vertical section of two bridge floors was shaped as two parabolas, its two parabolas cross at mid point, because the parabola mid point is the highest, so existing overpass bridge intersection upper deck of bridge generally has more than 10 meter high, article one, its bridge length of the overpass bridge of road reaches more than 300 meter, and construction costs is with large amount.

Three, summary of the invention:

The low spot overpass bridge that crosses is provided to provide in the middle of a kind of straight M shape the purpose of this utility model, by changing the wherein vertical section shape of a bridge floor of overpass bridge, reduce the bridge floor absolute altitude of overpass bridge, promptly reduce the pillar height of overpass bridge, shorten overpass bridge length, thereby reduce the overpass bridge construction cost, shorten the construction period; Reduce the discrepancy in elevation of the sweep of turning left in addition, change the present situation that the sweep arc of turning left at present adds the abrupt slope, guarantee traffic safety.

The technical solution of the utility model is: be made of the bridge floor of two right-angled intersections and 4 sweeps of turning left, 4 turn right sweep and columns, it is characterized in that: wherein the vertical section of a bridge floor is shaped as the similar M shape that is made of two parabolic segments, the vertical section of another bridge floor is shaped as parabola shaped, and the mid point of its parabola shaped bridge floor is that the mid point of peak and M shape bridge floor is that minimum point crosses.

Because the joint on two intersection road surfaces is in the minimum point of M shape bridge floor, then joint top layer bridge floor absolute altitude greatly reduces, with joint by original two-layer one deck that become, therefore, the utility model has reduced the pillar height of overpass bridge, has shortened the length of overpass bridge, thereby has reduced construction costs, shortened the construction period, and made the curved track of turning left also become very smooth.

Four, description of drawings:

Fig. 1 is the utility model M shape overpass bridge schematic top plan view;

Fig. 2 is a M shape overpass bridge longitudinal plan of the present utility model;

Fig. 3 is a parabola overpass bridge longitudinal plan;

Fig. 4 is 1/2 bridge of M shape of the present utility model lower floor bridge and the axis figure of pillar;

Fig. 5 is 1/2 bridge of M shape upper layer bridge of the present utility model and the axis figure of pillar;

Fig. 6 is M shape of the present utility model the turn left bridge of sweep and the axis of dilatation line chart of pillar;

Fig. 7 is M shape of the present utility model the turn right bridge of sweep and the axis of dilatation line chart of pillar;

Fig. 8 is 1/2 bridge of parabola overpass bridge lower floor bridge and the axis figure of pillar;

Fig. 9 is 1/2 bridge of parabola overpass bridge upper layer bridge and the axis figure of pillar;

Figure 10 is parabola overpass bridge the turn left bridge of sweep and the axis of dilatation line chart of pillar;

Figure 11 is parabola overpass bridge the turn right bridge of sweep and the axis of dilatation line chart of pillar.

Among the figure: 1, the vertical section is shaped as the bridge floor of M shape; 2, the vertical section is shaped as parabola shaped bridge floor; 3, the sweep of turning left; 4, the sweep of turning right; 5, column; 6, walkway.

Five, the specific embodiment:

As shown in Figure 1 and Figure 2, the utility model bridge floor 1, vertical section of being shaped as M shape by the vertical section is shaped as parabola shaped bridge floor 2, four turn right curved arc shape track 4 and the many root posts 5 of curved arc shape track 3, four of turning left and constitutes.The bridge floor that the vertical section is shaped as M shape is actually two sections parabola shaped road surfaces, form the low shape that is similar to M of two-supremes one, mid point is a minimum point, be the bridge bottom, the vertical section is shaped as parabola shaped bridge floor, mid point is a peak, and the bridge floor mid point that is shaped as M shape with the vertical section is that the minimum point place is cross and crosses.

For the advantage of M shape overpass bridge is described, existing engineering with M shape overpass bridge and parabola overpass bridge does one relatively.

Its joint top layer bridge floor absolute altitude of M shape overpass bridge is by 6.3 meters designs, the parabola overpass bridge is that 4 meters top layer bridge height are 10 meters designs by joint bottom bridge bridge floor absolute altitude, the long A-road of bridge is put the slope by 1: 10 gradient, and pillar only calculates overall height, does not consider the influence of pillar flexibility to the pillar cross-sectional sizes.Engineering quantity is more as follows:

(1) M shape overpass bridge:

1, pillar overall height: 637.52 meters

1. lower floor's bridge (see figure 4):

[(24+30)×4+32×2]×2＝56m

2. upper layer bridge (see figure 5):

[(2.37+3.15+3.94+4.73+5.41+5.91+6.2)×2+6.3]×2＝139.44m

3. curved bridge (see figure 6): 3.2 * 17 * 4=217.6m turns left

4. turn right and bend the bridge (see figure 7):

[(1.77+2.05+2.28+2.5+2.67+2.84+2.96+3.07+3.13+3.19)×2+3.2]×4＝224.48m

2, bridge is long:

1. the Four-Lane Road bridge is grown (seeing Fig. 4, Fig. 5): 321.38m

24.12×4+32.1×2＝160.68m

48.23×2+64.24＝160.7m

2. the long (see figure 6) of the sweep bridge of turning left

136×4＝544m

3. the long (see figure 7) of the sweep bridge of turning right

240×4＝960m

(2) parabola overpass bridge

1, pillar overall height: 1292m

1. lower floor's bridge (see figure 8)

[(2.04+2.56+3.0+3.36+3.64+3.84+3.96)×2+4.0]×2＝97.6m

2. upper layer bridge (see figure 9)

[(2.16+2.88+3.6+4.38+5.1+5.78+6.4+6.98+7.5+7.98+8.4+8.78+9.1+9.38+9.6+9.78+9.9+9.98)×2+10.0]×2＝530.72m

3. the sweep (see figure 10) of turning left

(2.56+2.94+3.33+3.71+4.1+4.48+4.87+5.25+5.64+6.02+6.41+6.79+7.18+7.56+7.95+8.33+8.72+9.1)×4＝419.76m

4. the sweep (seeing Figure 11) of turning right

[(1.69+1.95+2.19+2.4+2.59+2.75+2.89+3.0+3.09+3.15+3.19)×2+3.2]×4＝243.92m

2, bridge is long:

1. the Four-Lane Road bridge is grown (seeing Fig. 8, Fig. 9): 502.08m

Lower floor's bridge: 163.2m

Upper layer bridge: 40.16 * 2+258.56=338.88m

2. the sweep (see figure 10) of turning left

136.16×4＝544.64m

3. the sweep (seeing Figure 11) of turning right

256×4＝1024m

Claims

1, the low spot overpass bridge that crosses in the middle of a kind of straight M shape, constitute by the bridge floor of two right-angled intersections and 4 sweeps of turning left, 4 turn right sweep and columns, it is characterized in that: wherein the vertical section of a bridge floor is shaped as the similar M shape that is made of two parabolic segments, the vertical section of another bridge floor is shaped as parabola shaped, and the mid point of its parabola shaped bridge floor is that the mid point of peak and M shape bridge floor is that minimum point crosses.