
Ten residents of an alley in Taipei’s Xinyi District have been temporarily displaced after a massive sinkhole forced their evacuation over the weekend. Engineers found the source of the problem: groundwater beneath the alley seeped into a neighboring construction site, hollowing out the earth beneath the alley. The sinkhole has been filled, but more time is needed to assess the safety of the alley’s residential buildings. In the meantime, the city is providing the displaced residents with daily subsidies.
Cement trucks arrived one after the other on Saturday, pouring cement until late in the evening. Finally, the massive sinkhole that appeared earlier in the day in Taipei’s Xinyi District was filled in.
The incident occurred at around 3:13 p.m. along alley no. 60 of Chongde Street, when a sinkhole 15 meters in length, 3 meters wide and between 3 and 4 meters deep appeared. Police and firefighters evacuated residents in the surrounding area posthaste.
Local resident
Between 2:50 p.m. and 3:00 p.m., that whole section of the alley began sinking. At first there was just a small hole, and then less than 5 minutes later, the whole thing collapsed.
Then around 5:00 p.m., another serious subsidence occurred.
A section of the construction barrier for the neighboring construction site collapsed when the subsidence occurred. An initial assessment by workers found that groundwater beneath the alley seeped into the construction site, hollowing out an area beneath the alley and causing the collapse.
Chuang Chun-wei
Civil engineer
The depth of this excavation area is about 12 meters. Fortunately, there is this roadway, because the roadway is about 10 meters wide. As you can see, the collapsed area is just in front of the metal shack in front of the building. By the way things look, it hasn’t affected the foundation of the main structure.
Aside from filling in the sinkhole, water trucks were also brought into the construction site, where they pumped more than 4,000 cubic meters of water into the ground. The aim is to balance the groundwater at the site with that of the surrounding area, to prevent further subsidence. However, some have expressed concerns about the safety of homes along the alley.
Wang Yu-fen
Taipei Department of Urban Development
Ground-penetrating radar will be used to detect whether there are more holes, and the buildings themselves need to be checked to see if there is any tilting, or any related structural damage or cracks. After engineers make an assessment, residents can return to their homes, but it will take another one to two weeks
Chen Kuan-ling
Taipei Xinyi District Office
Everyone who has been temporarily resettled will receive a subsidy of NT$1,600 per day, up to a maximum of seven days. If it goes over that, we will communicate with the construction company. They’ve already promised to cover the difference.
Seven households were evacuated when the subsidence occurred, five of which have been temporarily resettled, accounting for 10 people in total.
北市信義區,昨天下午地層下陷,出現巨大天坑,昨天晚間已經填平,會坍塌就是因為連續壁出現混凝土包泥瑕疵,水和沙衝破壁面導致,今天上午都發局也到現場勘查,表示住戶回到家園前,還要先檢查地層有無孔洞,和屋內是否出現裂痕,大概需要1至2週時間。
混凝土車進進出出,不斷灌漿,終於在週六晚間,把出現在台北市信義區的大天坑回填得差不多。
回顧整起事故,發生在下午3點13分,信義區崇德街60巷的道路突然地層下陷,露出長15公尺,寬3公尺,深度3到4公尺的大洞,警消趕緊出動,疏散周遭住戶。
[[鄰近住戶]]
“(下午)兩點五十分到三點五分的時候,那一段就開始下陷,本來是陷小洞,後來不到五分鐘,全部整個塌下來”
不過下午5點多,地層又再度嚴重下陷。
工地圍籬應聲全倒,而釀禍的原因、初步研判,就是一旁的工地連續壁本身滲水,導致陸續掏空道路的地基,造成嚴重塌陷。
[[台北市土木技師公會理事長 莊均緯]]
“這個開挖區深度,大概是12公尺,還好有這個巷道在,因為巷道大概是10初米,會發現所謂崩塌範圍,剛好坐落建築物前面,鐵皮屋這個範圍,目前來看實際上,還沒侵入主結構地基”
事故現場不只路面填平,工地水車也不斷進駐,要再基地灌入4千多立方公尺的水,和地下水保持平衡,避免再外洩,不過外界也擔心後續安置問題。
[[都發局長 王玉芬]]
“透地雷達去探測,有沒有孔洞,建築物本身要監測,有沒有呈現傾斜狀態,到屋裡看有沒有相關毀損,或是裂縫等等,技術人員判斷之後,住戶才能回到家園,再一到兩週時間”
[[信義區區長 陳冠伶]]
“(安置)一天每個人1600(補助金),最高請領7天,如果超過部分,到時候會和廠商這邊溝通,承諾超出部分會承擔”
目前一共撤離7戶,需要安置的有5戶,一共10人。
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