無線傾角傳感器監(jiān)測英國圣馬利亞大教堂

英國英格蘭St Mary教堂最早可以追溯到11世紀(jì)，教堂的原始建筑始建于1180年左右，是在一個(gè)木制的盎格魯 – 撒克遜教堂遺址上修繕而成。1990年，St Mary教堂其特殊的建筑和歷史價(jià)值被列入建筑物和保護(hù)區(qū)法案。 在13和14世紀(jì)左右，St Mary教堂斷斷續(xù)續(xù)又進(jìn)行了修整。

直到最近，我們收到了來自St Mary教堂牧師朱爾斯對我們公司傾角傳感器的需求，大概內(nèi)容是：自1766年，我們教堂的塔樓進(jìn)行重建以后，直到2018年3月，塔樓傾斜了1.4°；這個(gè)月，塔樓傾斜了2.1°。由于塔樓傾斜所產(chǎn)生的壓力，使他對周圍其它建筑造成了墻體結(jié)構(gòu)開裂和建筑物移動等問題。據(jù)估計(jì)，該塔樓重約300噸。塔樓產(chǎn)生的壓力太大，使之一直從塔樓到圣壇的建筑都發(fā)生了傾斜。本來在該塔樓的墻上，我們掛著一只大鐘。墻體懸掛6個(gè)鈴鐺，可以給我們準(zhǔn)時(shí)報(bào)點(diǎn)。現(xiàn)在為了方便監(jiān)測，我們已暫停鈴聲，以便我們可以得到準(zhǔn)確的監(jiān)測數(shù)據(jù)。我們初步認(rèn)為教堂的底部基巖是石膏成分，而石膏材質(zhì)在干燥天氣非常容易收縮，這就是導(dǎo)致現(xiàn)在的問題之一。我們已向政府申請撥款查明沉降的原因，該調(diào)查和補(bǔ)救工程的初步費(fèi)用估計(jì)數(shù)額為600,000美元。

在教堂傾斜的情況更加嚴(yán)重之前，我們希望對建筑進(jìn)行實(shí)時(shí)監(jiān)測，有助于提示我們接下來要采取的措施，保證補(bǔ)救措施的有效性。我們希望在距離主樓最遠(yuǎn)的建筑上安裝傾角傳感器，同時(shí)在塔樓的底部，中間和頂部都裝上傾角傳感器進(jìn)行監(jiān)測。

The tower (that is leaning) is one that was rebuilt in 1766, after the original tower had to be demolished (they may have had the same problem!). In March 2018 the tower was leaning by 1.4 degrees; this month, it is leaning by 2.1 degrees. The tower is putting a lot of stress on the rest of the building, causing major structural cracking and movement, all the way to the opposite end (the chancel) of the building. The tower houses a clock, driven by large suspended weights which are rewound every week, and also 6 bells, the oldest dating to about 1600; we have suspended the bell ringing until we have the monitoring in place, so that we can measure any effects the bell ringing may have on the tower. It is estimated that the tower weighs around 300 tonnes.

We have applied for a grant to help us investigate the cause of the subsidence, in order to provide a solution – the underlying bedrock is gypsum and the soil is very susceptible to shrinkage in dry weather, which is what we think the problem may be. Initial cost estimates for the investigation and remedial works is in the order of $600,000. The monitoring will help by warning us of any further movement and will also measure the effectiveness of any remedial action.

We will install the inclinometers at the base, mid way and top of the tower, on the face furthest from the main building.

教堂由于年代久遠(yuǎn)，塔樓本身開始傾斜，這個(gè)問題對教堂的整體結(jié)構(gòu)產(chǎn)生了毀滅性的影響。St Mary教堂牧師朱爾斯選擇直川無線傾角傳感器ZCT800ML去測量塔的傾斜度。上海直川科技研發(fā)的LORA無線傾角傳感器，精度高達(dá)0.001°，網(wǎng)關(guān)和傾角最遠(yuǎn)距離可達(dá)2~3公里。-St Mary教堂牧師隨時(shí)可以在電腦前查看教堂的傾斜情況。希望直川的無線LORA傾角傳感器像遙遠(yuǎn)的守護(hù)神一樣，守護(hù)教堂的安全。