Is Kal­ibo’s Mobo bridge still safe?

Panay News - - REGION -  By Boy Ryan Zab

KAL­IBO, Ak­lan - En­gi­neers

al from the Depart­ment of Pub­lic Works and High­ways ( DPWH) cen­tral of­fice have rec­om­mended t he con­struc­tion of a new bridge to re­place the Kal­ibo Mobo bridge.

The DPWH’s Bureau of De­sign (BOD) rec­om­men­da­tion was made dur­ing the struc­tural in­tegrity as­sess­ment of the 20- year old bridge.

The agency’s in­spec­tion re­port pointed out that “strength­en­ing the Kal­ibo Mobo bridge due to de­fects of ex­ist­ing struc­ture and its bridge hy­draulic con­di­tion and foun­da­tion will re­quire con­struc­tion of bored piles which are ex­pen­sive and un­eco­nom­i­cal.”

“It is more prac­ti­cal to con­struct a new bridge, up­stream of the ex­ist­ing Kal­ibo Mobo bridge. The old bridge will re­main to serve the pedes­tri­ans and light ve­hi­cles,” stated the in­spec­tion re­port signed by Engr. Pas­tora Cabr­era, chief of BOD Sur­veys and In­ves­ti­ga­tion Di­vi­sion, and Engr. Ed­win Matan­gui­han, chief of BOD Bridges Di­vi­sion.

The tem­po­rary sin­gle- lane bridge also no longer con­forms to the cur­rent DPWH spec­i­fi­ca­tions for bridges. Thus, it will re­quire ex­ten­sive struc­tural re­pair and seis­mic retrofitting.

Dur­ing the ac­tual field in­spec­tion, BOD en­gi­neers no­ticed dam­aged floor planks along the bridge deck due to strong ty­phoons that hit Kal­ibo in 2008 (ty­phoon “Frank”) and 2012 (ty­phoon “Quinta”).

Mi­nor cor­ro­sion of the struc­tural el­e­ments had also dam­aged the bot­tom chords and cross stringers of the bridge, the re­port showed.

The in­spec­tion team also found ex­po­sure of around 6-7 me­ters of field bent and re­in­forced con­crete pipes above the or­di­nary wa­ter level. Sil­ta­tion was noted along the Ak­lan river near the area of Mobo bridge, both up­stream and down­stream.

Warn­ing signs ad­vis­ing the pub­lic for “only light ve­hi­cles” to use the bridge and the wa­ter level sen­sor as part of the com­mu­nity flood early warn­ing sys­tem were in­stalled.

The in­spec­tion team also stressed that “no de­tailed en­gi­neer­ing plans as built” were pre­sented dur­ing the time of in­spec­tion. Bridge de­signs plans also had no records on file with DPWH- Ak­lan Dis­trict En­gi­neer­ing Of­fice and Mu­nic­i­pal En­gi­neer­ing Of­fice.

To date, the one-lane bridge is be­ing used as a de­tour dur­ing the Jan­uary Ati-Ati­han fes­ti­val cel­e­bra­tion and an al­ter­nate route of mo­torists and bik­ers to Barangay Laguin­banua East in the west­ern town of Nu­man­cia.

The Mobo bridge field in­spec­tion was con­ducted from March 22 to 24, 2017 per re­quest of Sang­gu­ni­ang Bayan of Kal­ibo to BOD di­rec­tor assistant sec­re­tary Gil­berto Sen­son Reyes for a sci­en­tific study on how to strengthen the bridge struc­tural foun­da­tion of Mobo.

Mobo bridge is a 3-me­ter wide 18- span, 216 lin­eal me­ters struc­ture con­structed in 1997 dur­ing the term of then Kal­ibo mayor Allen Quimpo. The bridge sub­struc­ture is re­in­forced by con­crete pile foun­da­tion.

The bridge along the pro­vin­cial road sec­tion un­der the ju­ris­dic­tion of Kal­ibo mu­nic­i­pal govern­ment con­nects Barangay Mobo and Barangay Es­tan­cia (Si­tio Libtong). ( PN)

With Ak­lan Fo­rum Jour­nal/

PHOTO FROM DENR-6

An Ecosys­tem Man­age­ment Spe­cial­ist from the Depart­ment of En­vi­ron­ment and Nat­u­ral Re­sources (DENR) grabs a sam­ple of the species of sea­grass found in the coastal ar­eas of Bu­ru­anga, Ak­lan. Six species of sea grass thriv­ing in patches of beds were found by the DENR in Barangays Bay­bay, Bil-is, Pani­lon­gan, San­tander and Tubu­ran in Bu­ru­anga town.

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