Bridge is a construction purposed to connect roads through a lower hindrance. This hindrance commonly formed of water route or common land traffic. Usually, economical period of a bridge needs maintenance; this is because more old some bridge, then its structure will be degraded, whether caused by material durability of bridge’s components, environmental condition surrounds the bridge, or natural disasters which ultimately degrade the capacity of bridge both its safety and comfort for the user. Besides that, it is also for anticipation due to development or change on type and capacity of vehicles, which increases both its volume and weight out of the prediction. Thus, a bridge needs evaluation and maintenance in order to function well.
Indonesia has many bridges, hundreds of thousand; some of these are bridges located in Wonolelo Wonoseto village, Donoharjo, Ngaglik, Sleman, Yogyakarta. This bridge also must be maintained and evaluated. However, it is seen that the bridges are lack in maintenance which actually is a must.
Lack of maintenance is can be observed in each bridge’s component :
1. Grasses sprout up in the surface border of the bridge,
2. Corrosions are found almost in all surfaces of steel’s frame,
3. There is some parts of steel’s part that corrugated,
4. There is porous found in several joints,
5. Corrosions in vertical and parallel thunders,
6. There are crack, voids, and spalling in the deck,
7. Bearing is dirty and grasses sprout up surround it,
8. There is crack on concrete abutment and many wild plants sprout up surround it and in its body.
9.There is little sliding in the slope of bridge.
1. Grasses sprout up in the surface border of the bridge,
2. Corrosions are found almost in all surfaces of steel’s frame,
3. There is some parts of steel’s part that corrugated,
4. There is porous found in several joints,
5. Corrosions in vertical and parallel thunders,
6. There are crack, voids, and spalling in the deck,
7. Bearing is dirty and grasses sprout up surround it,
8. There is crack on concrete abutment and many wild plants sprout up surround it and in its body.
9.There is little sliding in the slope of bridge.
Accorded to the writer, damages found in this bridge are possibly caused by:
1. Corrosion of steel’s frame :
There are no maintenances for the bridge, such as painting in the frame, causing bridge more susceptible towards atmosphere corrosions.
Waste dumping in the abutment area which cause atmosphere more acidic around this place.
Rain water or non-evaporated dew, especially in the hidden parts (joints), causing more corrosion.
2. Damages on the deck of bridge, i.e. crack and spalling which probably caused by improper pouring, besides volume of vehicles. When the crack occurs, water permeates into the concrete and reaches the frame, causing corrosion. Due to this condition, the plane surface becomes wider because there is electrolyte added from other frame parts; the wider frame then presses the concrete then ultimately causes the concrete’s surface detached. If it is not immediately repaired, then there will be spalling in other parts of the deck and it is harm the stability of structure.
3. Damages on the sloping of oprit are maybe because there is no proper sticking between new river stone and the old one. Thus, the new match declines. If it is continue to happened, probably the old match will be scraped too and water reaches the ground, causing heap ground water rises thus decreases soil heap in the oprit.
1. Corrosion of steel’s frame :
There are no maintenances for the bridge, such as painting in the frame, causing bridge more susceptible towards atmosphere corrosions.
Waste dumping in the abutment area which cause atmosphere more acidic around this place.
Rain water or non-evaporated dew, especially in the hidden parts (joints), causing more corrosion.
2. Damages on the deck of bridge, i.e. crack and spalling which probably caused by improper pouring, besides volume of vehicles. When the crack occurs, water permeates into the concrete and reaches the frame, causing corrosion. Due to this condition, the plane surface becomes wider because there is electrolyte added from other frame parts; the wider frame then presses the concrete then ultimately causes the concrete’s surface detached. If it is not immediately repaired, then there will be spalling in other parts of the deck and it is harm the stability of structure.
3. Damages on the sloping of oprit are maybe because there is no proper sticking between new river stone and the old one. Thus, the new match declines. If it is continue to happened, probably the old match will be scraped too and water reaches the ground, causing heap ground water rises thus decreases soil heap in the oprit.
Recommendations suggested by the writer for better development of the bridge are:
1. Clearing on the pavement of the bridge thus water can be flowed from it which makes the pavement stay longer. And making drainase thus the water can't flow to truss.
2. Clearing of abutment from trashes and plants because it causes pollution and damages the structure.
3. Clearing of corrosion through wiping and smoothing with sandpaper then painting, thus the steel stay longer in its life. For bent shaft, better it is replaced because it is clearly lack its capability.
4. The making of abutment structure from concrete in east side to replace the structure from stone match is much recommended.
5. The slope on the bridge’s oprit is also more supports. Make sure that the implementation is proper with the technical standard, especially the sticking power between new match with the old one in order to avoid declining on the match of river stone.
6. Damages on the deck part such as crack are can be repaired through injection using epoction material), voids and spalling are can be repaired through shotcrete system (by spraying mortar or concrete on the surface of repaired deck using pressed equipment, mortar or concrete are sprayed with high pressure, thus results strong stickiness on the old surface of concrete).
1. Clearing on the pavement of the bridge thus water can be flowed from it which makes the pavement stay longer. And making drainase thus the water can't flow to truss.
2. Clearing of abutment from trashes and plants because it causes pollution and damages the structure.
3. Clearing of corrosion through wiping and smoothing with sandpaper then painting, thus the steel stay longer in its life. For bent shaft, better it is replaced because it is clearly lack its capability.
4. The making of abutment structure from concrete in east side to replace the structure from stone match is much recommended.
5. The slope on the bridge’s oprit is also more supports. Make sure that the implementation is proper with the technical standard, especially the sticking power between new match with the old one in order to avoid declining on the match of river stone.
6. Damages on the deck part such as crack are can be repaired through injection using epoction material), voids and spalling are can be repaired through shotcrete system (by spraying mortar or concrete on the surface of repaired deck using pressed equipment, mortar or concrete are sprayed with high pressure, thus results strong stickiness on the old surface of concrete).
