CN110792026A

CN110792026A - Side belly trompil structure of continuous truss bridge

Info

Publication number: CN110792026A
Application number: CN201910950302.8A
Authority: CN
Inventors: 王永军; 戴建国; 朱立锋; 苏斌
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-02-14

Abstract

The utility model provides a continuous truss bridge flank trompil structure, contains chord member, lower chord member, crossbeam, diagonal member, erects web member, decking and support, and the adjustment needs to trompil side truss piece internode to arrange, will erect the web member according to required trompil interval arrange with the both sides of diagonal member, diagonal member and erect web member and lower chord member department and form the common atress of node, set up the support simultaneously under erecting the web member, form the passway mouth of vehicle business turn over with the bridge flank. The invention arranges the channel at the originally closed truss flank, so that vehicles inside the bridge can be driven out of the bridge, and vehicles outside the bridge can also be driven into the bridge, thereby solving the problem that fire fighting vehicles enter and exit when the lower layer bridge is split in the face of the fire fighting loop in the original land range, ensuring the continuity of the fire fighting loop, being applicable to the convergence of other traffic forms, reducing the land range of the bridge, ensuring the continuity of the traffic and having higher economic benefit.

Description

Side belly trompil structure of continuous truss bridge

Technical Field

The invention designs a continuous truss bridge side belly opening structure, and belongs to the field of bridges.

Background

The urban double-layer traffic bridge is not only the traffic requirement, but also the sign of urban development progress. In order to save land, the development of urban double-layer traffic bridges at home and abroad is a great trend. The existing double-layer bridge has various structural forms, and a proper bridge type can be selected according to the environmental conditions.

The beam type bridge suitable for double-layer traffic mainly comprises a box girder bridge and a truss girder bridge. The truss girder has natural superiority to a double-layer bridge, the belly of the truss girder is hollow, ventilation is facilitated, arrangement of traffic space is facilitated, the rod piece in the truss girder is mainly subjected to axial stress on the whole, and material performance can be exerted more, particularly a heavy-load and large-span bridge structure.

At present, due to the fact that requirements of double-layer traffic on occupied space and traffic functions are more outstanding, higher requirements are put forward on double-layer bridges, for example, when the double-layer bridges break the occupied space, the fire-fighting loops in the original occupied space range are affected, and the fire-fighting loops are cut off; and both sides of the bridge are commercial or civil buildings, and if a fire fighting channel is additionally arranged outside the bridge, a large amount of investment is generated due to removal. At the moment, if the opening at the flank of the bridge can meet the entrance and exit of the fire-fighting vehicle, the continuity of the fire-fighting loop can be realized, and the investment of a construction party is reduced.

Therefore, a setting mode of the continuous truss bridge side web opening needs to be designed, the double-layer bridge is used for achieving the access function of special traffic such as fire fighting vehicles, and the like, so that the application range of the double-layer continuous truss bridge is wider, and the traffic function is more practical.

Disclosure of Invention

The invention provides a side belly opening structure of a continuous truss bridge, wherein a channel is arranged on an originally closed truss side belly, so that vehicles inside the bridge can be driven out of the bridge, and vehicles outside the bridge can be driven into the bridge, and therefore when a lower-layer bridge is cracked due to fire-fighting loops in the range facing the original land, the problem that fire-fighting vehicles enter and exit can be still solved, the continuity of the fire-fighting loops is guaranteed, the side belly opening structure can be suitable for merging other traffic forms, the range of the land of the bridge is reduced, the continuity of traffic is guaranteed, and high economic benefits are achieved.

In order to achieve the above object, the present invention provides a continuous truss bridge lateral opening structure, comprising:

the upper chord member is a main longitudinal stress component for bearing the truss bridge and supporting the upper deck;

the lower chord member is a main longitudinal stress component for bearing the truss bridge and supporting the lower deck;

the beam is a transverse stress component connected with the upper chord member or the lower chord member;

the diagonal web member is a stressed member connecting the upper chord member and the lower chord member and is arranged among truss sections except for the position of the side web opening of the truss bridge;

the vertical web members are stress members which are arranged on two sides of the opening position of the side web of the truss bridge and are used for connecting the upper chord member and the lower chord member, and the distance between the two vertical web members forms a passage channel;

the bridge deck is a stressed member connected with the upper chord member or the lower chord member and is a bearing member directly bearing the load of the bridge deck;

the support sets up under the perpendicular web member of truss bridge flank trompil position department for provide the vertical braces of trompil position department.

Furthermore, the opening position of the side belly of the bridge is positioned on the outermost truss sheet of the continuous double-layer truss bridge.

Furthermore, roof stiffening ribs are arranged at the bottom of the roof of the lower chord at equal intervals to reduce the fatigue effect caused by the action of later local vehicle load on the lower chord.

Further, set up lower floor's bridge floor on the lower chord, lower floor's bridge floor is through setting up special contact ramp (supplying the fire engine to go on the road from top to bottom) and current situation ground and communicate.

The invention arranges the channel at the originally closed truss flank, so that vehicles inside the bridge can be driven out of the bridge, and vehicles outside the bridge can also be driven into the bridge, thereby solving the problem that fire fighting vehicles enter and exit when the lower layer bridge is split in the face of the fire fighting loop in the original land range, ensuring the continuity of the fire fighting loop, being applicable to the convergence of other traffic forms, reducing the land range of the bridge, ensuring the continuity of the traffic and having higher economic benefit.

Drawings

Fig. 1 is an elevation view of a side belly opening of a continuous truss bridge provided by the present invention.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a detailed structural view of the open hole of the lateral web of the continuous truss bridge of the present invention.

Fig. 4 is a sectional view of fig. 3 taken along line 1-1.

Fig. 5 is a cross-sectional view 2-2 of fig. 3.

Detailed Description

The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 5.

Referring to fig. 1 to 5, the present invention provides a method for forming a side opening of a continuous truss bridge, comprising:

the upper chord member 1 is a main longitudinal stress component for bearing the truss bridge and supporting the upper deck;

the lower chord 2 is a main longitudinal stress component for bearing the truss bridge and supporting the lower deck, and is a component for bearing the vehicle load passing after the side web of the truss is perforated; the lower chord top plate stiffening rib 21 is used for reducing the fatigue effect of the top plate of the lower chord by considering the local vehicle load acting on the lower chord top plate.

The cross beam 3 is a transverse stress component connected with the lower chord and provides reliable transverse connection among different trusses;

the diagonal web member 4 is a stressed member connecting the upper chord member and the lower chord member and is arranged among the normal truss joints except the position of the opening of the side web of the bridge;

and the vertical web members 5 are stress members which are arranged on two sides of the opening position of the side web of the bridge and are used for connecting the upper chord member and the lower chord member, and are arranged on two sides of the opening position of the side web of the bridge, and a passing channel is formed by the distance between the two vertical web members.

The bridge deck 6 is a stressed member connected with the upper chord member or the lower chord member, is a platform for vehicles to pass through and is a bearing member directly bearing the wheel pressure of the automobile;

the support 7 is arranged below the vertical web member at the side web opening position of the truss bridge and used for providing vertical support at the opening position, and the independent pier is arranged below the support 7.

Taking a certain continuous truss vehicle traveling bridge as an example:

the plane of a certain continuous truss vehicle bridge is a curve, the radius of the minimum curve is 100m, the bridge is arranged to be 93+63+80m, the total length of the bridge is 236m, the bridge is arranged to be divided into an upper layer and a lower layer, the total width of the upper layer bridge is 27.2m, and the total width of the lower layer is 22.2 m. Because the construction of the bridge causes the fire-fighting loop in the range of the surrounding land, the bridge needs to be provided with a channel at the midspan to meet the requirements of preventing vehicles from entering and exiting under emergency conditions and ensure the continuous looping of the fire-fighting loop.

In this embodiment, when the continuous truss bridge provided by the invention is provided with side web holes, the arrangement of the side truss pieces needing to be drilled needs to be adjusted firstly, the vertical web members 5 are arranged at the two sides of the diagonal web members 4 according to the required hole-drilling distance, the diagonal web members 4, the vertical web members 5 and the lower chord members 2 form nodes to bear force together, and meanwhile, the supports 7 are arranged below the vertical web members 5 to provide the vertical supports required by the vertical web members 5 and the lower chord members 2. Roof stiffeners 21 are arranged at equal intervals at the bottom of the roof of the lower chord 2 to reduce the fatigue effect caused when the local vehicle load acts on the lower chord 2 in the later period. And arranging the rest upper chords 1 and the rest cross beams 3 according to a conventional steel truss bridge.

The invention has the following advantages:

firstly, under the condition that the stress safety of the truss bridge is not influenced, openings are effectively formed in the flanks of the bridge to enable special vehicles such as fire-fighting vehicles to enter and exit from the lower deck of the truss bridge, and the requirement of continuous traffic under special conditions is met; secondly, the method can reduce the newly added land acquisition and construction and safety investment brought by additionally arranging the fire-fighting loop, reduce the economic cost and the technical difficulty of the project, have better economic benefit and accelerate the development speed of the project.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims

1. A continuous truss bridge flank open cell structure, the structure comprising:

the inclined web members are stressed members connecting the upper chord member and the lower chord member and are arranged among the truss joints except the positions of the openings on the side web of the bridge;

the vertical web members are stress members which are arranged on two sides of the opening position of the side web of the bridge and are used for connecting the upper chord member and the lower chord member, and the vertical web members are arranged on two sides of the opening position of the side web of the bridge, and a passing channel is formed by the distance between the two vertical web members;

the support, this support sets up under the perpendicular web member of bridge flank trompil position department for provide the vertical support of trompil position department.

2. The continuous truss bridge side opening structure as claimed in claim 1, wherein said bridge side opening is located at an outermost truss panel of the continuous double-deck truss bridge.