4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs

Trap doors inside freeway overpasses

Blow the Mission Valley bridge back to Burbank

Some bridge inspector has the fun of periodically crawling up through the trap door  - Image by Rick Geary
Some bridge inspector has the fun of periodically crawling up through the trap door

Matt: While navigating through myriad “seismic retrofit” hazards on area freeways, I've noticed several trap doors on overpasses, with ladders leading inside. I've always assumed overpasses to be solid concrete. I've heard that in Switzerland, many critical bridges are filled with explosives so they can be blown up in case of invasion. Is Caltrans really concerned with earthquakes or is a New World Order vanguard covertly preparing for the United Nations takeover? What are these hidden chambers, and why are they there? — Joe Cesare, La Jolla

Quite a scenario, Joe. So, say we detect a convoy of L.A. developers heading south on 805, out to capture all our women and buildable real estate. We can light a fuse that’s sticking out somewhere on the Mission Valley bridge and blow ’em back to Burbank? Nice thought, but it doesn’t work that way, here or in Switzerland. One common method of constructing a prestressed concrete bridge is to make it in sections like long, hollow boxes held together with metal joints. Then some bridge inspector has the fun of periodically crawling up through the trap door and walking around in the mouse droppings and dead pigeons to make sure the concrete isn’t rotting and everything’s okay.

Here's something you might be interested in.
Submit a free classified
or view all

Previous article

San Diego Unified announces plan to judge winners of athletic contests based on “mastery” instead of scores

Point(s) Taken
Next Article

McDonald’s sauce gun trivia

At what point does quirky hipster knowledge become so obscure its essentially useless?
Some bridge inspector has the fun of periodically crawling up through the trap door  - Image by Rick Geary
Some bridge inspector has the fun of periodically crawling up through the trap door

Matt: While navigating through myriad “seismic retrofit” hazards on area freeways, I've noticed several trap doors on overpasses, with ladders leading inside. I've always assumed overpasses to be solid concrete. I've heard that in Switzerland, many critical bridges are filled with explosives so they can be blown up in case of invasion. Is Caltrans really concerned with earthquakes or is a New World Order vanguard covertly preparing for the United Nations takeover? What are these hidden chambers, and why are they there? — Joe Cesare, La Jolla

Quite a scenario, Joe. So, say we detect a convoy of L.A. developers heading south on 805, out to capture all our women and buildable real estate. We can light a fuse that’s sticking out somewhere on the Mission Valley bridge and blow ’em back to Burbank? Nice thought, but it doesn’t work that way, here or in Switzerland. One common method of constructing a prestressed concrete bridge is to make it in sections like long, hollow boxes held together with metal joints. Then some bridge inspector has the fun of periodically crawling up through the trap door and walking around in the mouse droppings and dead pigeons to make sure the concrete isn’t rotting and everything’s okay.

Sponsored
Here's something you might be interested in.
Submit a free classified
or view all
Previous article

Quartyard’s glowing

It’s so good to see a chef taking the trouble to create tastebud-caressing flavors
Next Article

Borat the first

“If you want to tell people the truth, you had better make them laugh or they will kill you.”
Comments
0

Be the first to leave a comment.

Sign in to comment

Sign in

Art Reviews — W.S. Di Piero's eye on exhibits Ask a Hipster — Advice you didn't know you needed Best Buys — San Diego shopping Big Screen — Movie commentary Blurt — Music's inside track Booze News — San Diego spirits City Lights — News and politics Classical Music — Immortal beauty Classifieds — Free and easy Cover Stories — Front-page features Excerpts — Literary and spiritual excerpts Famous Former Neighbors — Next-door celebs Feast! — Food & drink reviews Feature Stories — Local news & stories From the Archives — Spotlight on the past Golden Dreams — Talk of the town Here's the Deal — Chad Deal's watering holes Just Announced — The scoop on shows Letters — Our inbox [email protected] — Local movie buffs share favorites Movie Reviews — Our critics' picks and pans Musician Interviews — Up close with local artists Neighborhood News from Stringers — Hyperlocal news News Ticker — News & politics Obermeyer — San Diego politics illustrated Of Note — Concert picks Out & About — What's Happening Overheard in San Diego — Eavesdropping illustrated Poetry — The old and the new Pour Over — Grab a cup Reader Travel — Travel section built by travelers Reading — The hunt for intellectuals Roam-O-Rama — SoCal's best hiking/biking trails San Diego Beer — Inside San Diego suds SD on the QT — Almost factual news Set 'em Up Joe — Bartenders' drink recipes Sheep and Goats — Places of worship Special Issues — The best of Sports — Athletics without gush Street Style — San Diego streets have style Suit Up — Fashion tips for dudes Theater Reviews — Local productions Theater antireviews — Narrow your search Tin Fork — Silver spoon alternative Under the Radar — Matt Potter's undercover work Unforgettable — Long-ago San Diego Unreal Estate — San Diego's priciest pads Waterfront — All things ocean Your Week — Daily event picks
4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
Close