产品中心
新闻动态 当前位置:首页>新闻动态>新闻动态

冲击成孔

网址:www.luoyangchui.com.cn  2019-12-27  作者:admin    阅读:

冲击成孔
Percussive drilling
1、开锤前,护筒内必须加入足够的粘土和水,然后边冲击边加粘土造浆,以保证粘土造浆护壁的可行性。
1. Before hammering, enough clay and water must be added into the casing, and then the clay slurry must be added at the same time of impact to ensure the feasibility of clay slurry wall protection.
2、采用钻孔的粘土造浆,成孔过程中要及时加水调整好泥浆比重:≤1.25;粘度:18-20S;含砂率:≤6%。
2. In the process of drilling, add water in time to adjust the mud specific gravity: ≤ 1.25; viscosity: 18-20s; sand content: ≤ 6%.
3、定界面、终孔验收。在钻进过程中对照岩土工程勘察报告,进入中风化凝灰岩时施工单位技术员要查看岩样,自查符合要求后再上报监理、甲方定界面,验终孔。验收时从捞取的钻渣中取出样品,查明岩样并填写岩层深度、取样时间等标签,标签填写好后装袋保留。
3. Fixed interface and final hole acceptance. During the drilling process, according to the geotechnical engineering investigation report, when entering the moderately weathered tuff, the technician of the construction unit shall check the rock sample, and then report it to the supervisor and Party A to determine the interface and check the final hole. During the acceptance, take out the samples from the drilling slag, find out the rock samples and fill in the labels such as rock depth and sampling time. After the labels are filled in, bag them for retention.
4、冲击钻对准护筒中心,要求偏差≤±20mm,开始低锤密击,锤高0.4~0.6m,并及时加粘土泥浆护壁,使孔壁挤压密实,直至孔深达护筒下3~4m后,才加快速度,加大冲程,将锤提高至1.5~2.0m以上,转入正常连续冲击。
4. The percussion drill shall be aimed at the center of the pile casing, the deviation shall be no more than ± 20 mm, the low hammer shall be started to compact, the hammer height shall be 0.4-0.6 m, and the clay mud shall be added in time to protect the wall, so that the wall of the hole is squeezed and compacted, and the speed shall be accelerated and the stroke shall be increased until the hole depth reaches 3-4 m below the pile casing, and the hammer shall be increased to 1.5-2.0 m or above, and the normal continuous impact shall be conducted.
5、在钻进过程中每1~2m要检查一次成孔的垂直度。如发现偏斜应立即停止钻进,采取措施进行纠正。对于变层处和易于发生偏斜的部位,应采用低锤轻击、间断冲击的办法穿过,以保持孔形良好。
5. In the process of drilling, the verticality of the hole should be checked every 1-2m. If deviation is found, drilling shall be stopped immediately and measures shall be taken to correct it. In order to maintain good hole shape, low hammer and intermittent impact should be used to pass through the variable layer and the part prone to deflection.

返回新闻

出租电话
13313028229