CN-122013661-A - Double-layer steel truss girder drainage system and design method

Abstract

The application relates to a drainage system and a design method of a double-layer steel truss girder, and relates to the technical field of bridge design, wherein the drainage system comprises an upper drainage pipeline, and comprises an upper collection water pipe and an upper drainage water pipe with a set drainage amount, wherein a water inlet of the upper collection water pipe is positioned at one side of a girder upper chord member transverse bridge, which is lower, the upper collection water pipe is communicated with the upper drainage water pipe, and the upper drainage water pipe is positioned at the outer side of a girder lower chord member transverse bridge, which is lower; and the water inlet of the lower drainage pipeline is positioned on the truss girder lower chord member, and the water outlet is positioned on the lower side of the truss girder lower chord member. The problem of among the prior art in actual engineering application, especially in coastal, mountain area etc. strong wind are frequent, when strong wind acted on the bridge, the rainwater that upper deck overflow pipe discharged can be blown to the bridge inboard by the wind, directly falls to the lower floor bridge deck, aggravates the burden of lower floor drainage, influences drainage speed, exists probably influence driving safety is solved.

Inventors

• PENG LINGFENG
• LIU XIAOFENG
• JIA QINGRONG
• HU ZONGYU
• WU MINGCHUN
• PENG ZHENG
• LI SHIJUN
• GUO FENGCHAO
• TANG HEQIANG
• DENG WEI
• LIANG LI
• ZHANG TAIKE
• LIU SHUANG
• CHEN HUANYONG
• ZHONG QIUYUAN

Assignees

• 中铁大桥勘测设计院集团有限公司
• 广东省公路建设有限公司
• 广东湾区交通建设投资有限公司

Dates

Publication Date

20260512

Application Date

20260306

Claims (10)

1. 1. A two-layer steel truss drainage system, comprising: The upper drainage pipeline (1) comprises an upper collection water pipe (11) and an upper drainage water pipe (12) with a set drainage amount, wherein a water inlet of the upper collection water pipe (11) is positioned at one side of a girder upper chord member (2) which is transversely bridged to be lower, the upper collection water pipe (11) is communicated with the upper drainage water pipe (12), and the upper drainage water pipe (12) is positioned at the outer side of the girder lower chord member (3) which is transversely bridged to be lower; And the water inlet of the lower drainage pipeline (4) is positioned on the truss girder lower chord member (3), and the water outlet is positioned on the lower side of the truss girder lower chord member (3).
2. 2. A double-deck steel girder drainage system according to claim 1, wherein said upper layer collecting pipe (11) comprises: The water inlet of the upper layer longitudinal water collecting pipe (111) is positioned at the lower side of the transverse bridge of the truss girder upper chord member (2); The upper ends of the web member drainage pipes (112) are communicated with the upper-layer longitudinal water collecting pipes (111), and the lower ends of the web member drainage pipes are communicated with the upper-layer drainage pipes (12).
3. 3. A double-deck steel truss girder drainage system according to claim 2, wherein the upper-layer longitudinal water collecting pipes (111) comprise longitudinal water collecting pipe units (1111) the same in number as the web member drainage pipes (112), the longitudinal water collecting pipe units (1111) are arranged at intervals along the longitudinal bridge direction, and one end of each longitudinal water collecting pipe unit (1111) is communicated with the upper end of the corresponding web member drainage pipe (112).
4. 4. A double-layer steel truss girder drainage system according to claim 2, wherein the upper layer collecting water pipe (11) further comprises a plurality of vertical water guide pipes (113), a water inlet at one end of each vertical water guide pipe (113) is positioned at one side of the girder upper chord member (2) which is lower in the transverse direction, and the other end of each vertical water guide pipe is communicated with the upper layer longitudinal water collecting pipe (111).
5. 5. A double-deck steel truss girder drainage system according to claim 1, wherein said upper drainage pipe (12) comprises: A longitudinal drainage pipe (121) which is arranged along the truss girder lower chord member (3) and is positioned at the outer side of the lower side of the cross bridge of the truss girder lower chord member (3), wherein the drainage outlet of the longitudinal drainage pipe (121) is positioned at the lower side of the longitudinal bridge of the truss girder lower chord member (3); And a plurality of overflow pipes (122) which are communicated with the longitudinal drainage pipe (121) and are arranged at intervals along the length direction of the longitudinal drainage pipe (121).
6. 6. A double-deck steel girder drainage system according to claim 1, wherein the lower drainage pipeline (4) comprises drainage units corresponding to the number of areas between the girder diagonal web members (5), the drainage units comprising: A lower layer longitudinal drainage pipe (41) which is positioned below the lower side of the area transverse bridge between the truss beam inclined web members (5); And the water inlets of one end of the plurality of lower-layer vertical water guide pipes (42) are positioned at one side of the lower transverse bridge of the truss girder lower chord member (3), and the other end of the plurality of lower-layer vertical water guide pipes is communicated with the lower-layer longitudinal drainage pipes (41).
7. 7. A design method of a drainage system of a double-layer steel truss girder is characterized in that, a double-deck steel truss girder drainage system for designing any one of claims 1 to 6, comprising the steps of: acquiring a rainfall threshold value based on climate parameters of the bridge site area; Acquiring drainage design runoff of the upper deck based on the water collecting area and the rainfall threshold of the upper deck; and setting the drainage quantity of the upper layer drainage pipe (12) according to the drainage design runoff quantity of the upper layer bridge deck.
8. 8. The method for designing a drainage system of a double-deck steel truss girder according to claim 7, wherein the method further comprises, before obtaining the drainage design runoff of the upper deck based on the water collection area and the rainfall threshold of the upper deck: the catchment area of the upper deck is obtained based on the total length of all the longitudinal catchment pipe units (1111), and the width of the upper deck.
9. 9. The method for designing a double-deck steel truss girder drainage system according to claim 7, further comprising the step of setting the pipe diameter of the lower vertical water guide pipe (42), comprising: Acquiring a rainwater deflection angle based on climate parameters of a bridge site area; Acquiring the design runoff of the lower deck based on the rainwater deflection angle, the upper deck shielding width, the bridge girder height, the lower deck width, the full span length of the lower deck and the rainfall threshold; and setting the pipe diameter of the lower vertical water guide pipe (42) according to the design runoff of the lower deck.
10. 10. The method for designing a drainage system of a double-deck steel truss girder according to claim 9, wherein the obtaining the design runoff of the lower deck based on the rainwater deflection angle, the upper deck shielding width, the bridge girder height, the lower deck width, the full span length of the lower deck and the rainfall threshold comprises: Acquiring the catchment width of the lower deck based on the rainwater deflection angle, the upper deck shielding width, the bridge girder height and the lower deck width; Based on the catchment width of the lower deck, the full span length of the lower deck, the width of the lower deck and the rainfall threshold, the design runoff of the lower deck is obtained.

Description

Double-layer steel truss girder drainage system and design method Technical Field The invention relates to the technical field of bridge design, in particular to a double-layer steel truss girder drainage system and a design method. Background With increasing complexity of urban traffic networks and increasing shortage of land resources, the double-layer steel truss bridge is widely applied to modern urban traffic construction as a bridge form for efficiently utilizing space. The bridge is usually provided with the upper layer of the motor vehicle lane and the lower layer of the non-motor vehicle lane or the sidewalk, so that the road traffic capacity is effectively improved. However, the special construction of double deck bridges also presents unique drainage challenges. The drainage of the double-layer steel truss girder is an important factor for influencing the operation state of the bridge all the time, especially, in order to meet the centrifugal force requirement of driving, the bridge deck must be made into a larger unidirectional transverse slope, and the water collecting area and the drainage strength of the unidirectional transverse slope bridge deck are twice that of the traditional bidirectional transverse slope. In the prior art, the drainage structure of the traditional double-layer truss girder is usually provided with a longitudinal drainage pipe with a through length at the upper layer, and when the design water quantity is large, a certain overflow pipe is additionally arranged to directly drain rainwater which is not discharged out of a bridge. The lower layer bridge deck is shielded by the upper layer bridge deck, and the size of the lower layer longitudinal water pipe is generally designed to be smaller than that of the upper layer longitudinal water pipe. However, in practical engineering application, particularly in areas with frequent strong winds such as coasts and mountain areas, when strong winds act on bridges, rainwater discharged by overflow pipes of the bridge deck at the upper layer can be blown to the inner side of the bridges by the winds and directly fall to the bridge deck at the lower layer, so that the burden of drainage at the lower layer is increased, the drainage speed is influenced, and the problem that the driving safety is possibly influenced exists. Disclosure of Invention The application provides a drainage system and a design method for a double-layer steel truss girder, which can solve the problems that in the prior art, in actual engineering application, particularly in strong wind-prone areas such as coasts and mountain areas, when strong wind acts on a bridge, rainwater discharged by overflow pipes of an upper deck can be blown to the inner side of the bridge by the wind and directly falls to a lower deck, the burden of lower deck drainage is aggravated, the drainage speed is influenced, and the driving safety is possibly influenced. In a first aspect, an embodiment of the present application provides a drainage system for a double-deck steel truss girder, including: The upper drainage pipeline comprises an upper collection water pipe and an upper drainage water pipe with a set drainage amount, wherein a water inlet of the upper collection water pipe is positioned at one side of the girder upper chord member transverse bridge, which is lower, the upper collection water pipe is communicated with the upper drainage water pipe, and the upper drainage water pipe is positioned at the outer side of the girder lower chord member transverse bridge, which is lower; and the water inlet of the lower drainage pipeline is positioned on the truss girder lower chord member, and the water outlet is positioned on the lower side of the truss girder lower chord member. In one embodiment, the upper layer collecting pipe includes: The water inlet of the upper layer longitudinal water collecting pipe is positioned at the lower side of the upper chord member transverse bridge of the truss girder; The upper ends of the web member drainage tubes are communicated with the upper layer longitudinal water collecting tubes, and the lower ends of the web member drainage tubes are communicated with the upper layer drainage tubes. In one embodiment, the upper layer of longitudinal water collecting pipes comprises longitudinal water collecting pipe units, the number of the longitudinal water collecting pipe units is the same as that of the web member drainage pipes, the longitudinal water collecting pipe units are arranged at intervals along the longitudinal bridge direction, and one end of each longitudinal water collecting pipe unit is communicated with the upper end of the corresponding web member drainage pipe. In one embodiment, the upper layer water collecting pipe further comprises a plurality of vertical water guide pipes, a water inlet at one end of each vertical water guide pipe is positioned at one side of the chord member transverse bridge of the truss girder, which is lower,