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class="inside_rnewtil">管線定位儀在使用中遇到常見問題解答</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：415 更新時間：2023-12-18</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-family: 宋體;">管線定位儀在使用中遇到常見問題解答</span></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-family: 宋體;">問：探測過程中干擾是如何產(chǎn)生的？</span></strong><strong><span style="font-family: Calibri; line-height: 150%;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">直埋電纜測試儀</span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">是探測目標(biāo)金屬管線上的施加信號電流產(chǎn)生的電磁場。在理想情況下電磁場的形狀應(yīng)是標(biāo)準(zhǔn)的同心圓。干擾的產(chǎn)生最常見的原因是目標(biāo)管線上的信號耦合到鄰近的管線上。被干擾的電磁場是一個變形的電磁場，從而造成讀數(shù)不準(zhǔn)確。發(fā)射頻率越高相鄰管線的干擾就越大。</span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：為什么我在其它的管線上探測到干擾信號？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">答：</span> </span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">這種情況是由于發(fā)射機(jī)施加的信號，通過公共接地點(diǎn)使信號分流到了其他管線上或互感耦合到了其它管線上。這時最好使用直接連接法施加信號，或更換信號施加點(diǎn)，并使用較低的頻率（低頻）。</span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：如何用谷值法驗(yàn)證峰值法定位的準(zhǔn)確性？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">對于理想的無干擾管線，波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法定位的位置是重合的。但對于有并行管線或有其它干擾時，波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法定位的位置就會不重合。此時的管線真正位置在波峰值一側(cè)。當(dāng)干擾嚴(yán)重時可能找不到零值點(diǎn)，此時只能根據(jù)峰值位置大概給出管線的位置。最好采取改變施加信號的方法，重新進(jìn)行管線定位。當(dāng)波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法所測位置不重合時，管線直讀測深也會有較大偏差，甚至無法讀出深度。</span></span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：有什么方法可以減少管線電磁場形態(tài)的變形？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">首先，你可以試著降低發(fā)射機(jī)的輸出功率，有時信號太強(qiáng)，探測的效果不一定最好，尤其是多根管線并行、非常接近的情況下。如果使用的是感應(yīng)法，這時可以改用直接連接法或夾鉗法施加信號。這們可以減少耦合到其它管線的信號，從而減少管線電磁場形態(tài)的變形。如果，發(fā)現(xiàn)谷值法和峰值法定位不一致，換一個一致的地方進(jìn)行定位，如果找不到一致的地方，我們通常以峰值位置做為管線的位置，深度測量也在峰值模式下進(jìn)行，當(dāng)然也存在一定的誤差，但比谷值法更接近真實(shí)值。</span><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：該設(shè)備是否可同時用來探測銅線電纜和光纜？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">目前的地下路燈管線探測儀只能探測帶有金屬護(hù)套或芯線的電纜。只有帶有金屬護(hù)套或中央金屬加強(qiáng)芯的光纜才能用地下管線探測到。要探測電纜必須給導(dǎo)體施加一個可以探測的信號（發(fā)射機(jī)信號）。</span><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：為什么我的接收機(jī)測深不準(zhǔn)確？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;">1.</span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">檢查是否選擇了正確的工作模式，應(yīng)選擇峰值模式。</span></span></p><p style="text-indent:37px;line-height:150%"><span style="font-size: 16px;"><span style="font-family: Calibri; line-height: 150%; font-size: 19px;">2.</span><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">檢查峰值法和谷值法定位的位置是否一致。直讀測深的方法雖然簡單，但讀取正確結(jié)果需要一定的條件，否則測量精度不高，甚至得到錯誤結(jié)果。應(yīng)用直讀測深的條件之一是此時的峰零值要基本重合，否則誤差會很大。其二是直讀的深度要經(jīng)過校正才能達(dá)到較高的可靠性，校正的因素包含：管線埋設(shè)土壤的濕度，以及檢測信號的頻率，一般土壤濕度越大、檢測頻率越高，校正的系數(shù)就應(yīng)越小，一般在</span><span style="font-size: 16px; font-family: Calibri;">0.8-0.95</span><span style="font-size: 16px; font-family: 宋體;">之間。簡單的辦法是找一個深度已知且無干擾的管段，測出直讀深度，與實(shí)際埋深相比求的校正系數(shù)。</span></span></span></p><p style="text-indent:37px;line-height:150%"><span style="font-family: 宋體; line-height: 150%; font-size: 16px;"><span style="line-height: 150%; font-size: 16px; font-family: Calibri;">3</span>．測量埋深時要注意接收機(jī)的方向，盡量使接收機(jī)的線圈與管線走向垂直，這個要求可以通過輕微轉(zhuǎn)動接收機(jī)，使面板上的顯示讀數(shù)達(dá)到最大值來達(dá)到。此外，還應(yīng)注意：直讀埋深值是接收機(jī)機(jī)身地面到管道中心的距離。</span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：遇到信號強(qiáng)度突然減弱是何原因？</span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">如果電流測量值突然減小，可能是經(jīng)過了</span><span style="font-size: 16px; font-family: Calibri;">T</span><span style="font-size: 16px; font-family: 宋體;">型分叉或分支管。在區(qū)域內(nèi)進(jìn)行</span><span style="font-size: 16px; font-family: Calibri;">360</span><span style="font-size: 16px; font-family: 宋體;">度掃描，查找其他中心線，以確認(rèn)導(dǎo)體是否有分支。如果深度值和信號強(qiáng)度發(fā)生變化，這時應(yīng)檢查電流測量值，如果電流測量值保持不變，則說明仍在目標(biāo)管線上方，只是由于地下金屬管線的深度發(fā)生了改變。電流測量值可以幫助使用者確定是地下金屬管線的深度變化造成了探測的信號強(qiáng)度的變化。</span></span></span></p><p style="line-height: 150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問：如果感應(yīng)信號感應(yīng)到</span></strong><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">到其他管線上怎么辦？</span></strong><strong></strong></span></p><p style="line-height: 150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">可以采用以下辦法：</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">1、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">調(diào)低頻率</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">2、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">調(diào)低功率</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">3、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">如果可能使用直連法或夾鉗</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">4、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">把接地插到遠(yuǎn)離目標(biāo)管線和其他埋地管線的地方</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 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