Overall summary of residential project of SaadatAbad-Phoenix:
Residential project of SaadatAbad-Phoenix is one the excavation and earth retention projects of Istasazeh corporation which is located in the 2nd district of Tehran. The project site was a land with the area of 1600 square meters. Based on the structural design and the plans presented by the client, the level of the foundation, for excavation and cutting purposes, would be -17 meters. Istasazeh corporation was responsible for designing and constructing the stabilizing system for excavation walls as well as the drainage system and cutting operation. According to the surveys done by the topography team, the net area of all the stabilized walls was equal to 2500 square meters.
Challenges of residential project of SaadatAbad-Phoenix:
Taking the neighbor buildings and their overloads into consideration is very important in earth retention and excavation projects when it comes to design and construction. Surroundings of this project were a mixture of streets, residential buildings, and yards. Bahar Str 4th was adjacent to the northern wall and Shahrdadi Blvd. 13th was adjacent to the southern wall of the excavation. From the other hand a 4-storey building (with one basement) and a 5-storey building (with one basement) and their yards were adjacent to the western side of the excavation. The presence of these residential buildings and the lack of cooperation from its residents, led to a difficulty towards acquiring the legal consents required from the neighbors for the excavation project. This was due to the existence of a legal requirement that demands the consent of adjacent neighbors regarding any construction that would affect their buildings such as nailing and anchoring the sub-foundation. Any hypothetical complaint from these residents can legally suspend the project. It is worth to say that the overloads from the eastern and western side of the excavation were noticeably greater than the overloads from the northern and southern side.
One the important challenges of this project was the clients unsuccessful attempt at acquiring the neighbor’s consent regarding the reinforcement of the excavation wall. This led to a change in design and construction of the stabilization methods and caused a delay on the schedule.
Another problem regarding the neighbor buildings were their poor quality of construction and the poor quality of connections used in them. This problem forced the paneling, stabilization, and cutting processes to become extremely precise along the walls of the excavation. These operations were also divided into smaller sections to further lower the risk of damaging the neighbor buildings. Also, the team had to be sure about the continuity of every level of stabilization and cutting alongside the walls of the excavation. Besides, the presence of numerous residential buildings around the project site caused the monitoring process and controlling any displacement of the western and eastern walls very critical.
After the start of the operation and during the stabilization of one of the first levels of the excavation, the team realized that the foundation of one the neighbor buildings had trespassed into the project site.
The constant presence of the neighbors from the western and eastern building and their complaints regarding the construction sound, caused the operation to slow down so, a new schedule had to be made to avoid disturbing the neighbors. Excavating and stabilizing process as well as loading and transferring the soil had to be rescheduled to minimize the disturbance. This decision required the noisy machinery to work at the specific hours of the day that disturbance would be minimal.
The location of urban installations had to be acquired to avoid any accidents caused by the reinforcements in the northern and southern walls of the excavation.
Another important challenge of this project was regarding its short time schedule. The schedule presented by the client demanded that the stabilization and excavation had to be finished within 80 days. This situation made it necessary for several construction units such as welding, stabilization, and excavation teams work simultaneously at the site. This simultaneous presence made the staff management process very critical.
Also, the presence of made-up ground under the yard of eastern neighbors made the borehole excavation a challenging process.
Solutions in of residential project of SaadatAbad-Phoenix:
After evaluating all the possible methods for stabilizing the excavation by Istasazeh corporation, it was decided that soil anchorage and soldier piles should be used for stabilization of the southern part of eastern and western buildings and soil nailing should be used to stabilize the walls under their yards. Stabilizing the northern wall of the excavation was a mixture of soil nailing and ground anchorage methods. The southern wall however, only needed nailing.
Due to the lack of cooperation from the neighbor residents, soil nailing and soil anchorage could not be used to stabilize the northern parts of eastern and western walls. Based on the demands of the client, the designing team proposed Struts system and truss retaining structure to stabilize these walls. This proposal was accepted by the client and then sent to the construction team on the site.
To solve the problem of the trespassing foundation, the construction team started demolishing the trespassing part of that foundation to secure the borders of the project for further constructions.
For the stabilization of northern and southern walls, the construction team excavated the boreholes with absolute precision to avoid hitting the urban underground installation. The team also followed the safety protocols in every step of the way.
To avoid the noise disruption, it was decided that activities that produced the most sound get rescheduled. According to the revised schedule the excavation process was moved to the early hours of the day and shotcrete pouring was moved to the later hours of the day. This time schedule caused the air compressing machine to be shut down in the middle of the day, when neighbors might be resting, and be replaced by activities such as leveling the walls, installing mesh plates, installing head nails, installing head anchors, and injecting boreholes that produces less sound in comparison. The time schedule for the activities related to the grabbing crane and trucks was managed to cause minimal harm to neighbors.
Due to the limited time schedule of just 80 days, the project manager and the construction teams such as the welding team (responsible for making the steel piles), stabilization team, and the excavation team had to work 24/7 to overcome the time challenge and complete the project within the time schedule.
Residential project of SaadatAbad-Phoenix
Overall summary of residential project of SaadatAbad-Phoenix:
Residential project of SaadatAbad-Phoenix is one the excavation and earth retention projects of Istasazeh corporation which is located in the 2nd district of Tehran. The project site was a land with the area of 1600 square meters. Based on the structural design and the plans presented by the client, the level of the foundation, for excavation and cutting purposes, would be -17 meters. Istasazeh corporation was responsible for designing and constructing the stabilizing system for excavation walls as well as the drainage system and cutting operation. According to the surveys done by the topography team, the net area of all the stabilized walls was equal to 2500 square meters.
Challenges of residential project of SaadatAbad-Phoenix:
Taking the neighbor buildings and their overloads into consideration is very important in earth retention and excavation projects when it comes to design and construction. Surroundings of this project were a mixture of streets, residential buildings, and yards. Bahar Str 4th was adjacent to the northern wall and Shahrdadi Blvd. 13th was adjacent to the southern wall of the excavation. From the other hand a 4-storey building (with one basement) and a 5-storey building (with one basement) and their yards were adjacent to the western side of the excavation. The presence of these residential buildings and the lack of cooperation from its residents, led to a difficulty towards acquiring the legal consents required from the neighbors for the excavation project. This was due to the existence of a legal requirement that demands the consent of adjacent neighbors regarding any construction that would affect their buildings such as nailing and anchoring the sub-foundation. Any hypothetical complaint from these residents can legally suspend the project. It is worth to say that the overloads from the eastern and western side of the excavation were noticeably greater than the overloads from the northern and southern side.
One the important challenges of this project was the clients unsuccessful attempt at acquiring the neighbor’s consent regarding the reinforcement of the excavation wall. This led to a change in design and construction of the stabilization methods and caused a delay on the schedule.
Another problem regarding the neighbor buildings were their poor quality of construction and the poor quality of connections used in them. This problem forced the paneling, stabilization, and cutting processes to become extremely precise along the walls of the excavation. These operations were also divided into smaller sections to further lower the risk of damaging the neighbor buildings. Also, the team had to be sure about the continuity of every level of stabilization and cutting alongside the walls of the excavation. Besides, the presence of numerous residential buildings around the project site caused the monitoring process and controlling any displacement of the western and eastern walls very critical.
After the start of the operation and during the stabilization of one of the first levels of the excavation, the team realized that the foundation of one the neighbor buildings had trespassed into the project site.
The constant presence of the neighbors from the western and eastern building and their complaints regarding the construction sound, caused the operation to slow down so, a new schedule had to be made to avoid disturbing the neighbors. Excavating and stabilizing process as well as loading and transferring the soil had to be rescheduled to minimize the disturbance. This decision required the noisy machinery to work at the specific hours of the day that disturbance would be minimal.
The location of urban installations had to be acquired to avoid any accidents caused by the reinforcements in the northern and southern walls of the excavation.
Another important challenge of this project was regarding its short time schedule. The schedule presented by the client demanded that the stabilization and excavation had to be finished within 80 days. This situation made it necessary for several construction units such as welding, stabilization, and excavation teams work simultaneously at the site. This simultaneous presence made the staff management process very critical.
Also, the presence of made-up ground under the yard of eastern neighbors made the borehole excavation a challenging process.
Solutions in of residential project of SaadatAbad-Phoenix:
After evaluating all the possible methods for stabilizing the excavation by Istasazeh corporation, it was decided that soil anchorage and soldier piles should be used for stabilization of the southern part of eastern and western buildings and soil nailing should be used to stabilize the walls under their yards. Stabilizing the northern wall of the excavation was a mixture of soil nailing and ground anchorage methods. The southern wall however, only needed nailing.
Due to the lack of cooperation from the neighbor residents, soil nailing and soil anchorage could not be used to stabilize the northern parts of eastern and western walls. Based on the demands of the client, the designing team proposed Struts system and truss retaining structure to stabilize these walls. This proposal was accepted by the client and then sent to the construction team on the site.
To solve the problem of the trespassing foundation, the construction team started demolishing the trespassing part of that foundation to secure the borders of the project for further constructions.
For the stabilization of northern and southern walls, the construction team excavated the boreholes with absolute precision to avoid hitting the urban underground installation. The team also followed the safety protocols in every step of the way.
To avoid the noise disruption, it was decided that activities that produced the most sound get rescheduled. According to the revised schedule the excavation process was moved to the early hours of the day and shotcrete pouring was moved to the later hours of the day. This time schedule caused the air compressing machine to be shut down in the middle of the day, when neighbors might be resting, and be replaced by activities such as leveling the walls, installing mesh plates, installing head nails, installing head anchors, and injecting boreholes that produces less sound in comparison. The time schedule for the activities related to the grabbing crane and trucks was managed to cause minimal harm to neighbors.
Due to the limited time schedule of just 80 days, the project manager and the construction teams such as the welding team (responsible for making the steel piles), stabilization team, and the excavation team had to work 24/7 to overcome the time challenge and complete the project within the time schedule.
