Pine Valley Creek Bridge

Pine Valley Creek Bridge
Official name	Nello Irwin Greer Memorial Bridge
Convicted	Interstate 8
Crossing of	Pine Valley Creek
place	Pine Valley, California
construction	Prestressed concrete - box girder bridge
overall length	N: 515.4 m, ; S: 530.7 m
width	2 × 12.8 m
Number of openings	five
Longest span	137.2 m
height	137 m
start of building	1973
completion	1975
planner	Dywidag , Man-Chung Tang
	location

32.823055555556 -116.56027777778Coordinates: 32 ° 49 ′ 23 " N , 116 ° 33 ′ 37" W.

The Pine Valley Creek Bridge , officially called the Nello Irwin Greer Memorial Bridge , is a highway bridge that leads the Interstate-8 section at Pine Valley over the Pine Valley Creek , called the Kumeyaay Highway .

Pine Valley is an unincorporated community or census-designated place in the Cuyamaca Mountains in southeastern San Diego County in California , USA .

The bridge was named after Nello Irwin Greer, the project engineer in charge of planning the local section of Interstate 8, who made sure the freeway was built well away from the site of the rare Jeffrey pine .

Built from 1973 to 1975 was the first bridge in cantilever built prestressed concrete bridge in the United States, where it is still one of the highest bridges.

description

As usual with motorway bridges, the Pine Valley Creek Bridge has two lanes and one hard shoulder in each direction, but no sidewalks.

It has its own superstructures for each directional carriageway, which are separated by an 11.6 m (38 ft ) wide gap. Depending on the terrain, they are of different lengths; the northern carriageway is 515.42 m (1691 ft) and the southern is 530.66 m (1741 ft) long. The creek runs 137 m (450 ft) under the bridge.

The bridge has 5 openings with 4 double piers, the pillar spacing is 77.72 / 86.89 + 103.63 + 137.16 + 115.82 + 81.07 / 87.17 m (255/285 + 340 + 450 + 380 + 266/286 ft).

The deck slabs are each 12.80 m (42 ft) wide. At the same time they form the cover plate for a 5.79 m (19 ft) high box girder with a trapezoidal cross-section unchanged over the entire length of the bridge.

The slim double pillars made of reinforced concrete stand on a common base. They are each stiffened by two crossbars. On the upper 18 m (60 ft) they become inclined, divergent pillars that support the respective box girder and are connected by another crossbar.

The bridge was designed by Dyckerhoff & Widmann, Inc. under the direction of Man-Chung Tang , their chief engineer, and executed by a joint venture between SJ Groves and Dyckerhoff & Widmann.

Construction began with abutment no.6 and pillar no.5. For cost reasons and to keep nature in the creek as untouched as possible, an almost 100 m (320 ft) long steel auxiliary bridge was installed in the space between the hollow girders , with which the pier head No. 5 was initially concreted. Then the construction of the box girders began from this pillar in both directions with cantilevered carriages . After 47 m (155 ft), the auxiliary bridge was pulled forward to the pillar no. 4, which had been built in the meantime, and the front carriages were moved to its pier head. Then the next cantilever started there. The procedure was repeated on the next two piers until the other abutment was reached. In this way, only one construction site facility was required at abutment 6. The workers and the building material were able to get to the respective installation site via the auxiliary bridge and the sections that had already been completed without using the valley and losing time on long journeys.

Web links

Commons : Pine Valley Creek Bridge - Collection of Images, Videos, and Audio Files

Pine Valley Creek Bridge on HighestBridges.com
Man-Chung Tang: The Story of the Koror Bridge . International Association for Bridge and Structural Engineering (IABSE), 2014, ISBN 978-3-85748-136-9 , pp. 78 (p. 85 in PDF) ( iabse.org [PDF; 8.4 MB ]).

Individual evidence

^ Senate Concurrent Resolution No. 33 — Relative to the Nello IrwinGreer Memorial Bridge on archive.org (PDF; 3.6 KB)
↑ ^a ^b Richard Heinen: Design-construction considerations for alternate systems; competitive bid encouragement . Pine Valley Creek Bridge. In: Walter Podolny, Jr. (Ed.): Prestressed Concrete Segmental Bridges . Structural Engineering Series No. 9. US Department of Transportation; Federal Highway Administration, Washington, DC Aug 1979, pp. 139; Pine Valley Creek Bridge p. 142 ( full text in Google book search).
^ Reggie Holt, Lian Duan: Bridge Engineering in the United States: Pine Valley Creek Bridge . In: Wai-Fah Chen, Lian Duan (Eds.): Handbook of International Bridge Engineering . CRC Press, Boca Raton 2014, ISBN 978-1-4398-1029-3 , pp. 65 ( limited preview in Google Book search).
↑ Man-Chung Tang: The Story of the Koror Bridge . International Association for Bridge and Structural Engineering (IABSE), 2014, ISBN 978-3-85748-136-9 , pp. 78 (p. 85 in PDF) ( iabse.org [PDF; 8.4 MB ]).

[1] Senate Concurrent Resolution No. 33 — Relative to the Nello IrwinGreer Memorial Bridge on archive.org (PDF; 3.6 KB)

[Heinen-2] Richard Heinen: Design-construction considerations for alternate systems; competitive bid encouragement . Pine Valley Creek Bridge. In: Walter Podolny, Jr. (Ed.): Prestressed Concrete Segmental Bridges . Structural Engineering Series No. 9. US Department of Transportation; Federal Highway Administration, Washington, DC Aug 1979, pp. 139; Pine Valley Creek Bridge p. 142 ( full text in Google book search).

[3] Reggie Holt, Lian Duan: Bridge Engineering in the United States: Pine Valley Creek Bridge . In: Wai-Fah Chen, Lian Duan (Eds.): Handbook of International Bridge Engineering . CRC Press, Boca Raton 2014, ISBN 978-1-4398-1029-3 , pp. 65 ( limited preview in Google Book search).

[4] Man-Chung Tang: The Story of the Koror Bridge . International Association for Bridge and Structural Engineering (IABSE), 2014, ISBN 978-3-85748-136-9 , pp. 78 (p. 85 in PDF) ( iabse.org [PDF; 8.4 MB ]).