吹砂填筑路堤技術(shù)交底.doc

吹砂填筑路堤技術(shù)交底
一. 一般要求 (一)   材料：
1、中、粗砂為宜，含砂量（即小于74μm的顆粒粒徑）不宜大于10%。     2、片石：采用較大的塊石，一般粒徑不小于0.3m，石料抗壓強(qiáng)度大于20Mpa,未風(fēng)化。 (二)  操作工藝：     1、首先清除場(chǎng)地內(nèi)地表草皮，腐植土以及植物根系，然后對(duì)天然地基進(jìn)行碾壓；要求地面以下1m范圍內(nèi)土基壓實(shí)度（重型）不小于85%。     2、用挖掘機(jī)在路堤坡腳位置挖出臨時(shí)排水溝（施工期間用土質(zhì)邊溝，待路基預(yù)壓期結(jié)束，沉降及側(cè)向位移穩(wěn)定后，再漿砌片石）。     3、對(duì)于攪拌樁路段，完成樁體后鋪碎石墊層，再吹填路基。     4、利用編制砂袋在護(hù)道位置修筑擋水堤，其高度應(yīng)按吹砂高度而定，最少應(yīng)高出吹堤高度30～50cm。擋水堤頂部寬度應(yīng)不小于1m，擋水堤要求堅(jiān)實(shí)，不留空洞，要將填砂范圍與路基兩側(cè)農(nóng)田徹底隔離。 　　5、開始吹填工作。每個(gè)吹填區(qū)設(shè)置長(zhǎng)40m的泄水口，設(shè)于圍堰中部，以排出泥水，必要時(shí)可配備抽水機(jī)排水。     6、當(dāng)路堤高度小于2m時(shí)，可作一次吹填，當(dāng)路堤高度大于2m時(shí)，應(yīng)分層吹填，分層吹填的厚度一般為1-2米。     7、吹填標(biāo)高控制，測(cè)量標(biāo)樁擬30m×30m設(shè)
Blowing sand filling embankment Technology Details
1. General requirements (a) Material:
1, the coarse sand is appropriate, the sand content (that is less than 74μm particle size) should not be greater than 10%. 2, rubble: the larger the stone, the general size not less than 0.3m, stone compressive strength greater than 20Mpa, not weathering. (B) the operation process: 1, first clear the site in the Mainland table turf, humus and plant roots, then the natural foundation for RCC; requirements 1m below the surface of the soil-based compaction (heavy duty) not less than 85%. 2, with the excavator dug in the location of the foot embankment temporary drainage ditches (with the soil during the construction of ditches, until the end of preloading embankment, settlement and lateral displacement of stable, then mortar and stones). 3, the mixing section, completed after the gravel pile cushion, and then hydraulic fill embankment. 4, use of sand bags in preparation of construction of water retaining embankment berm location, its height should be high blowing sand, blowing at least should be higher than the levee height 30 ~ 50cm. Retaining embankment top width shall be not less than 1m, retaining embankment required a solid, without leaving empty areas to fill with sand embankment on both sides of farmland complete isolation. 5 Reclamation work began. Reclamation District, 40m long each set of discharge ports, located in the central cofferdam to discharge muddy water, if necessary, can be equipped with water pumps. 6, when the embankment height is less than 2m, to be a reclamation, when the embankment height greater than 2m should be layered back filling, layered back filling of the thickness of 1-2 meters. 7, hydraulic fill level control, measuring 30m × 30m stake to be set
 

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