How to understand the upper bearing type, the middle bearing type and the lower bearing type in the

This refers to arch bridges. Upward bearing means that the pavement is on top of the arch.

The middle bearing type is that the bridge deck is in the middle of the arch, and the lower bearing type is the bridge deck under the arch.

Extended material: "The Bridge".

Brief introduction. Bridges generally refer to structures erected on rivers, lakes and seas to enable vehicles and pedestrians to pass smoothly. In order to adapt to the rapid development of the modern transportation industry, bridges are also extended to be structures erected to make traffic more convenient for crossing mountain streams, poor geology or other traffic needs.

The bridge is generally composed of a superstructure, a substructure, a bearing and an ancillary structure, and the superstructure, also known as the bridge span structure, is the main structure for crossing obstacles; The substructure includes the abutment.

piers and foundations; The bearing is a force transmission device that is arranged at the supporting place of bridge span structure and bridge pier or abutment; Ancillary structures refer to bridgehead laps, tapered slope protection, bank revetments, diversion projects, etc.

2.Basic Definition.

1. [bridge]

2.Specialized man-made structures with carrying capacity for railways, roads, channels, pipelines, etc., used across rivers, valleys, or other transportation lines.

Bridges. Zizhi Tongjian: Tang Ji".

3.A metaphor for a person or thing that can communicate. Pathology.

It is a bridge between basic and clinical courses.

3.Cited explanations.

Buildings erected on the water or in the air for passage. "Quay Guanzi Beizhi": "There are no trails in the mountains, no bridges in the mountains, and no contacts." Tang Zhengdi, "Kaitian Biography of the Letter": "Bridges, landscapes, cars, people, grass and trees, geese and birds, utensils, curtains, Wu Daoxuan."

of the Lord. "Ming Yuan can stand.

Jiazi Midsummer Deng's Zhonglou Guanhai City": "Its shaped, or such as a flag, such as a floating tu, such as a puppet language, spring trees and thousands of homes, uneven, bridges and states, intermittent contact, time and minute, faint and faint, there are really painters who can not exhaust their ingenuity." Yang Shuo's Kapok.

It's a long road, and travelers have to carry their bags and walk across broken bridges to hop on the train on the other side. ”

2.A metaphor can connect people or things. South Dynasty Liang.

Hui Jiao "The Legend of the High Monks, the Miracle of the Gods, and the Public": "When you practice the good way, you will be a bridge for future generations." For example, cadres are the bridge between the party and the masses.

Encyclopedia: Bridges.

This refers to arch bridges. It is mainly judged by the location of the lane. When the bridge deck is located in the upper part of the superstructure, it is called a top-bearing bridge, such as a beam bridge and an arch bridge; The bridge deck is a bridge located in the middle of the superstructure, which becomes a medium-bearing bridge; When the bridge deck is located in the lower part of the upper bridge, it is called a downward supporting bridge, such as a tied arch bridge.

When the bridge deck is located in the upper part of the superstructure, it is called the upward bearing bridge; When the bridge deck is located in the middle of the superstructure, the bridge is called a medium-bearing bridge; When the bridge deck is located in the lower part of the superstructure, it is called a downward bearing bridge. The superstructure refers to the structural parts above the bridge foundation, such as piers, abutments, beams, arches, etc. The bridge deck system can be understood as a road surface structure, which does not include beams.

Usually these three forms are for arch bridges, as shown in the figure below:

Generally refers to arch bridges. The stress system of the arch bridge can be divided into two levels, the first level is the arch, and the second level is the bridge deck. The vehicle load is selected to the bridge deck, and then transmitted from the bridge deck to the arch.

When the bridge deck is above the arch of the bridge arch, it is an upward bearing arch bridge, when the bridge deck is at or below the arch foot of the bridge arch, it is the downward bearing type, and when the bridge deck is between the arch arch and the arch foot, it is the middle bearing type.

Generally, only arch bridges, simply put, the roadway is in the upper, lower and middle positions of the stressed structure.

Answer]: Take the date d

The test point of this question involving Oak Minyou is the classification of bridges. The bridge is divided into an up-bearing bridge, a down-bearing bridge and a middle-bearing bridge according to the position of the carriageway beam of the superstructure.

Answer] :d This question examines the main types of bridges. According to the position of the carriageway of the superstructure, the bridge can be divided into the upper bearing type (the bridge deck structure key is roughly arranged on the main load-bearing structure) bridge, the lower draft of the town bearing bridge, and the middle bearing bridge. Friendship dress.

Answer] :d This question mainly examines the main types of bridges. According to the position of the carriageway of the superstructure, the bridge can be divided into the upper bearing type (the bridge deck knot wheel shelter structure Bukai bridge is placed on the main load-bearing structure) bridge, the lower bearing bridge, and the middle bearing bridge. Staring at Tong Meng.