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Bridge Prestressed System
Extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge. The name comes from the word extrados, the exterior or upper curve of an arch, and refers to how the "stay cables" on an extradosed bridge are not considered as such in the design, but are instead treated as external prestressing tendons deviating upward from the deck. In this concept, they remain part of (and define the upper limit of) the main bridge superstructure.
The cable system of a extradosed cable-stayed bridge consists of three main components: cable body, main tower saddle, and cable anchoring system.
ADVANTAGES
Extradosed cable-stayed bridges have the following characteristics:
The tower is short. The tower height of a extradosed cable-stayed bridge is only the same as that of a cable-stayed bridge.
The main beam of a extradosed cable-stayed bridge has high stiffness and is the main load-bearing component. The height to span ratio of the main beam of a extradosed cable-stayed bridge is generally higher than that of a typical cable-stayed bridge of the same span, but lower than that of a continuous beam bridge of the same span.
The stress amplitude of the cable is small. The stress amplitude of the cables in a extradosed cable-stayed bridge is only one-third of that of a typical cable-stayed bridge.
The cable system of the extradosed cable-stayed bridge is a steel strand system. Due to the fact that some cable-stayed bridges generally adopt a saddle structure at the top of the tower, the traditional parallel steel wire cable system cannot continuously pass through the saddle area at the top of the tower, so the cable can only use a steel strand system.
USE
The main function of the main tower cable saddle in a extradosed cable-stayed bridge is to allow the cables to continuously pass through the main tower, while also ensuring the convenience of cable replacement.
SPECIFICATIONS
Cable anchors specification structure dimension parameter table (unit：mm)
Cable specification | Anchor plate | Nut | Protection cover | Anchor base plate | Embedded pipe | HDPE protection tube | Anti-skid anchorage device | Magneticflux sensor（options） | |||||
Round tube | Half tube | ||||||||||||
ΦA | E | ΦB | F | Dmin | ☐C | ΦJ | ΦK | ΦQ | ΦQ | ☐T | P |
Three anchors are installed at each end. | |
YXLAT15-19 | Φ220 | 120 | Φ290 | 90 | 400 | 350 | Φ230 | Φ245 X 8 | Φ160 | Φ140 | 400 | 700 | |
YXLAT15-22 | Φ245 | 125 | Φ320 | 95 | 400 | 390 | Φ255 | Φ273 X 9 | Φ180 | Φ180 | 500 | 775 | |
YXLAT15-27 | Φ270 | 140 | Φ345 | 105 | 400 | 420 | Φ280 | Φ299 X 9 | Φ180 | Φ180 | 500 | 775 | |
YXLAT15-31 | Φ270 | 140 | Φ345 | 105 | 450 | 450 | Φ280 | Φ299 X 9 | Φ200 | Φ180 | 500 | 775 | |
YXLAT15-37 | Φ285 | 150 | Φ360 | 110 | 450 | 480 | Φ295 | Φ315 X 10 | Φ200 | Φ180 | 500 | 775 | |
YXLAT15-43 | Φ310 | 160 | Φ395 | 125 | 450 | 520 | Φ320 | Φ340 X 10 | Φ240 | Φ225 | 550 | 900 | |
YXLAT15-55 | Φ330 | 170 | Φ420 | 135 | 450 | 570 | Φ340 | Φ360 X 10 | Φ240 | Φ225 | 550 | 900 | |
YXLAT15-61 | Φ360 | 175 | Φ450 | 145 | 450 | 600 | Φ370 | Φ390 X 10 | Φ260 | Φ225 | 550 | 900 | |
YXLAT15-73 | Φ380 | 190 | Φ480 | 155 | 450 | 650 | Φ390 | Φ410 X 10 | Φ280 | Φ255 | 600 | 1000 | |
YXLAT15-91 | Φ430 | 215 | Φ540 | 185 | 450 | 720 | Φ440 | Φ465 X 10 | Φ280 | Φ255 | 600 | 1200 | |
PACKAGE
Packaging & Shipping:
1) All the products are packed with seaworthy packing.
2) Customer's special requirement for packing can be satisfied.
3) Air freight; sea freight and truck freight are all available.
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