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求助:静压管桩遇砂层打不下去,怎么办?有啥好办法?

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riversun 发表于 2009-3-10 21:03:28 | 显示全部楼层 |阅读模式
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />一工程,121根静压管桩,500,开口桩尖,桩长44米,在29米遇粉细砂层,静压不下去,由于多种原因不能就此作为持力层而停止施工,也不能使用锤击设备,在此诚恳请教大家大家有何辅助施工办法,把桩打下去。
先谢谢了!!

澳门葡京娱|乐|城:国际品牌|顶_级_信_誉
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ljmtidilgw 发表于 2009-3-10 21:16:34 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />什么原因? 能否介绍下,好对证下药。比如有没有勘察到的硬层,计算下,不用打入那么深也能满足设计要求。
就要打那么深,我先来个方案 -“引孔”
请专家再出好主意。

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 楼主| riversun 发表于 2009-3-10 22:05:01 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />细说一下:淤泥质软土上覆14米厚炸山回填石头,采用冲孔钻机打穿回填层,回填5-8cm碎石和粘土,分层填筑到地表,后采用静压桩机施工预制管桩。在29米左右有一粉细砂层,厚度3-6米,有的桩很容易压下去,有的桩压不下去,最大静压阻力表读有600t。设计认为,此层粉细砂层上部全为淤泥或者淤泥质土,侧向对桩的约束力太小,不宜采用这层粉细砂层作为持力层,故此,必须想办法打穿这层粉细砂层,把桩端达到下面的中砂层上。
所以现在的问题是把砂层打穿?长螺旋引孔有施工深度的问题,要引孔深度可能有33米左右。
再次谢谢大家,请大家多出主意!!

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hero_hjs 发表于 2009-3-11 22:22:04 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />能否改用振动锤压桩?
不行的话可考虑先高压射水在静压沉桩。

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riversun + 3 可以考虑的好办法
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 楼主| riversun 发表于 2009-3-12 15:26:34 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />高压射水?压力需要多大,具体做法有例子吗?

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 楼主| riversun 发表于 2009-3-12 15:28:29 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />另外,请教各位对于中砂持力层,锤击施工和静压施工最终的承载力是否一致?两种施工方法施工的桩承载力有区别么?

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leng_ran 发表于 2009-3-13 03:58:22 | 显示全部楼层
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leng_ran 发表于 2009-3-13 03:58:56 | 显示全部楼层
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leng_ran 发表于 2009-3-13 04:00:12 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />整体地层是什么样的啊?

澳门葡京娱|乐|城:国际品牌▃顶_级_信_誉
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leng_ran 发表于 2009-3-13 04:02:10 | 显示全部楼层
本帖最后由 三T上人 于 2015-11-8 15:31 编辑 <br /><br />30到40多是什么土?

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leng_ran 发表于 2009-3-13 04:03:39 | 显示全部楼层
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leng_ran 发表于 2009-3-13 04:04:39 | 显示全部楼层
在海上打桩的应该懂一些
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wangjianping 发表于 2009-3-13 13:33:43 | 显示全部楼层
本帖最后由 wangjianping 于 2009-3-13 13:35 编辑

following three methods
1    predrilling through the hole of phc pile by use of small diameter drill rig

2    jetting,pumps high pressure water through a ripe to a nozzle  located at
      the pile tip and loosens the fine sand in front of the pile

3    spudding drivind steel pipe in to the fine sand and then removing pipe and
      driving the phc pile the  resulting hole

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hukan 发表于 2009-3-13 16:20:25 | 显示全部楼层
可以考虑用震动沉桩

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工程部民工 发表于 2009-3-13 20:05:28 | 显示全部楼层
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ljmtidilgw 发表于 2009-3-13 21:17:50 | 显示全部楼层
wangjianping 专家水平很高,hukan和工程部民工很有见解,值得楼主参考。
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jyb0199 发表于 2009-3-14 11:20:02 | 显示全部楼层
震动沉桩或高压射水,但29米高压射水可能不太行,
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tmsr 发表于 2009-3-14 17:31:35 | 显示全部楼层
可考虑先高压射水在静压沉桩

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wangjianping 发表于 2009-3-15 01:06:06 | 显示全部楼层
reply to 7# QUESTION
Effect of Pile Installation Method on Pipe Pile Behavior in Sands
Paik, K
Department of Civil Engineering, Kwandong University, Kangwon-do, Korea.

Salgado, R
School of Civil Engineering, Purdue University, West Lafayette, IN.

(Received 24 April 2002; accepted 4 February 2003)

Abstract
Open-ended pipe piles are often used for the foundations of both land and offshore structures because of their relatively low driving resistance. In this study, calibration chamber tests were conducted on model pipe piles installed in sands with different soil conditions in order to investigate the effects of the pile installation method on penetration parameters and bearing capacity. Results of the test program showed that both the hammer blow count necessary to install the piles and the incremental filling ratio (IFR), which is used to indicate the degree of soil plugging in open-ended piles, decreased (1) with increasing hammer weight for the same driving energy, and (2) with increasing hammer weight at the same fall height. The base and shaft load capacities of the piles were observed to increase (1) with increasing hammer weight for the same driving energy, and (2) with increasing hammer weight for the same fall height. It was also observed that the noise level observed during pile driving decreases (1) as the driving energy decreases and (2) as the hammer weight increases for the same driving energy. Model jacked piles were also installed and tested. The jacked piles were found to have higher bearing capacities than identical driven piles under similar conditions, mostly due to the more effective development of soil plugging in jacking than in driving.
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wangjianping 发表于 2009-3-15 01:07:23 | 显示全部楼层
NOTE THAT STATEMENT:Model jacked piles were also installed and tested. The jacked piles were found to have higher bearing capacities than identical driven piles under similar conditions, mostly due to the more effective development of soil plugging in jacking than in driving.

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wangjianping 发表于 2009-3-15 11:27:01 | 显示全部楼层
Yang et al. (2006a; 2006b) reported field tests on jacked piles and driven piles at a
construction site in Hong Kong and investigated the difference in load-transfer
mechanisms in both types of pile. The piles involved were either 305x305x180 or
305x305x230kg/m Grade 55C steel H-piles. The length of piles ranged from 25.8 to
41.5m. The findings indicated that the shaft response of jacked piles was generally
stiffer and stronger than that of driven piles. However, the base resistance of jacked
piles was weaker, compared to that of driven piles. Yang et al. also observed that a
greater portion of load was carried by the base of driven piles, while a greater portion
of load was carried by the shaft of jacked piles
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wangjianping 发表于 2009-3-15 11:27:33 | 显示全部楼层
Yu et al. (2003) presented the results of field tests on a 40-m long 305x305x225kg/m
steel H-jacked pile at a construction site in Hong Kong. It was found that the shaft
resistance of pile carried a majority of applied load. They also monitored the excess
pore water pressure generated during pile installation. The excess pore water pressure
was found to increase and dissipate rapidly in alluvium and completely decomposed
granite. Moreover, a slight increase in shaft resistance with time was detected in the
field test.

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wangjianping 发表于 2009-3-15 11:27:50 | 显示全部楼层
Zhang et al. (2006) reported the field test results of two Grade 55C 305x305x180kg/m
jacked piles at a site in Hong Kong. The lengths of the piles were 34.8 and 39.0m,
respectively. Based on the test results and over 100 field test results in Guangdong,
the ratio of pile capacity to the corresponding final jacking load, Pult / PJ, was found to
be correlated with the slenderness ratio, L / D, of the piles. Zhang et al. suggested that
the final jacking load can be less than 2.5Pd for very long piles, but should be greater
than 2.5Pd for piles shorter than 37D.
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wangjianping 发表于 2009-3-15 11:28:54 | 显示全部楼层
Li et al. (2003) described a case study of steel H-pile installed at a construction site in
Hong Kong. The findings of their study showed that creep settlement of jacked piles
can be reduced with preloading. Figure 2.4 shows the schematic preloading regime
suggested by Li et al. (2003). If the pile was subjected to a load level PE which was
lower than the preload level PB, the ultimate creep settlement δult at that load level
would be smaller than the residual creep settlement at point C, δr

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fenkeai 发表于 2009-3-17 09:04:51 | 显示全部楼层
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zsx1234567 发表于 2009-3-17 11:34:47 | 显示全部楼层
同意震动沉桩
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jay82twj 发表于 2009-3-17 16:17:16 | 显示全部楼层
看来潭里都是高手,新人学习中。。。
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longyuqq 发表于 2009-3-17 23:18:11 | 显示全部楼层
学习
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山河 发表于 2009-3-18 21:32:05 | 显示全部楼层
学习
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ya_we_ga 发表于 2009-3-19 08:34:08 | 显示全部楼层
高压射水或震动
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lysbd1986 发表于 2009-3-20 21:54:19 | 显示全部楼层
:)
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li1025jie 发表于 2009-3-26 19:24:34 | 显示全部楼层
看样子!有位兄弟的意见很多,就是看不懂!

恳请看懂的给梳理一下!
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linxiru 发表于 2009-8-26 11:12:43 | 显示全部楼层
看不懂
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 楼主| riversun 发表于 2009-8-27 18:05:13 | 显示全部楼层
感谢大家。本工程已经胜利结束。最终的解决方法为:

我们在现场群策群力,召开了诸葛亮会议,设计了一种伸缩钻头,从管桩中间放下去,取消桩尖,在穿过管桩后,钻头张开,扩孔直径为450mm,效果很好,扩孔穿过砂层后,提出钻头,继续压桩。

此方法速度快,现场干净,没有高压水冲导致的满场泥泞。

可以同时开钻多根桩。

搞施工,还是要依靠人民群众啊

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ljmtidilgw 发表于 2009-8-27 21:14:31 | 显示全部楼层
谢谢riversun 朋友的及时反馈,很好的技术革新!

学习了!
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longmier 发表于 2010-8-9 11:25:05 | 显示全部楼层
学习了
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x0811 发表于 2010-8-12 21:55:35 | 显示全部楼层
学习了
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liubingphc 发表于 2010-10-19 13:24:09 | 显示全部楼层
谁能把那些英文翻译一下啊
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风之子 发表于 2020-10-12 01:25:34 | 显示全部楼层
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