振动式插板机对塑料排水板回带现象的处理

振动式插板机对塑料排水板回带现象的处理根据相关规范规定，严格检查塑料排水板的回带长度，当其超过50cm 时，必须在相邻板位处补打一根，且回带的根数不宜超过打设总根数的5%。

为有效减少塑料排水板回带，本文就对塑料排水板施工的“回带”现象进行探讨，谈些体会，供同行参考，不妥之处，敬祈斧正。

According to the relevant regulations, strict inspection of plastic drainage plate back belt length, when it exceeds 50cm, must make a root in the adjacent plate at the back, and the root number should not take more than a total number of 5%. In order to effectively reduce the plastic drainage plate back, this article focuses on the construction of plastic drainage board " back " phenomenon is discussed, talk about some experience, for reference, inappropriate, Jing Qi Fu zheng.1.塑料排水板“回带”现象概述1 plastic drainage board " back " phenomenon of塑料排水板施工顺序为：定位→将塑料排水板通过导管从管靴穿出→将塑料排水板与桩尖连接贴紧管靴并对准桩位→插入塑料排水板→拔管剪断塑料排水板。

插板机就位后通过振动锤驱动套管对准插孔位下沉，排水板从套管内穿过与端头的锚靴相连，套管顶住锚靴将排水板插到设计入土深度，拔起套管后，锚靴连同排水板一起留在土中，然后剪断连续的排水板，即完成一个排水孔插板操作。

插板机就可移位到下一个排水孔继续施打。

在插设过程中, 可能会因为套管中进入淤泥,增大了塑料板与套管壁的摩擦力以致造成塑料板带出，这就是回带。

排水板与管靴连接示意图见下图。

塑料排水板穿过插板机的套管，从套管下端穿出，与专用管靴连接。

The construction sequence of plastic drainage boards : the location and the plastic drainage plate through the catheter from the tube boots out, the plastic drainage plate and pile tip is connected tightly tube boots and align pile to insert the plastic drainage plate, pipe cutting of plastic drainage plate. Insertion machine in place through the vibration hammer drive bushing alignment Jack sink, drain through the casing and is connected to the anchor boots end, sleeve anchor boots to the drainage plate inserted into the design depth, pull up the casing, anchor boots together with drainage board in the soil, and then cut the continuous drainage board, to complete a drainage hole board operation. Inserting plate can shift to the next drainage holes continue to play. In the inserting process, may be because the sleeve into the mud, increases the friction plastic board and the casing wall so as to cause the plastic plate is brought out, which is brought back. Drainage plate and tube boots connection diagram below. Plastic drainage plate through a cannula inserted machine, from the casing wear, connected with the special tube boots.图排水板与管靴连接示意图Figure drainage plate and tube boots connection diagram(1).排水板(2).排水板弯折部分(3).管靴(4).套管( 1 ). The drainage plate (2 ). The drainage plate bending part ( 3 ). ( 4 ) the casing pipe shoe.为了避免淤泥进入板芯以致堵塞排水通道,影响排水效果，防止塑料排水板被带出，塑料排水板导管靴与桩尖均为采用圆形。

桩尖平端与导管靴配合适当，避免错缝，防止淤泥在打设过程中进入导管、增大对塑料排水板的阻力。

底部端头的塑料排水板应反折回一定长度，与“-”或“H”形锚销可靠连接，并且锚销与导管下端口密封要严。

In order to avoid silt into the core that blocking the drainage channels, drainage effect, prevent the plastic drainage plate is taken out, plastic plate drainage catheter boots and pile tip are using circular. Pile tip flat end and the catheter boots with the appropriate, avoid the wrong seam, prevent silt in the play set into the catheter, the process of increasing the resistance of plastic drainage plate. Plastic drainage plate at the bottom end of the back should be a certain length, and " - " or " H " shaped anchor pin and reliable connection, anchor pin and the pipe port seals should be strictly.2.塑料排水板回带的原因分析Analysis of 2 plastic drainage plate back to the cause of2.1原因1：淤泥挤入管内The 2.1 reason 1: silt into the tube塑料排水板在插设过程中，由于承压淤泥具有极强的流动性，受桩靴与插管的密封程度影响，淤泥极易挤入管内，造成排水板粘在插管内壁，导致插管上提时，排水板自重及土体摩擦力远小于插管上提时对排水板的摩阻力，从而导致全程回带现象的产生（见图1a）。

Plastic drainage plate in the inserting process, because the pressure mud has a strong fluidity, the sealing of the pile shoe and the cannula, silt are easy to squeeze the tube, causing drainage plate glued to the inner wall of the intubation cannula, lead to mention, drainage and soil friction is much smaller than the weight lifting on the drainage tube the friction plate, resulting in the entire back phenomenon ( see Figure 1a ).2.2原因2：被土体夹住2.2 reasons: 2 by soil clamp插管未堵塞，塑料排水板部分回带。

该现象多发生在插设深度较浅，且土层较为干硬的情况，原因是插管上提后，桩位成孔，排水板无法被土体夹住，当桩管上提到较为软塑性土层时，周围土体可以夹住排水板底端，此现象为部分回带。

Was not blocked, plastic drainage plate part back. This phenomenon occurred in the inserting depth is shallow, and the soil is dry and hard situation, reason is put after intubation, pile hole, drainage board can not be clamped when soil, pile pipe that is soft plastic soil, soil can clamp the drain plate bottom, this phenomenon is part of back belt.2.3原因3：摩擦力The 2.3 reason 3: friction塑料排水板在插设至设计深度后，由于排水板自重、桩靴的重力及土体摩擦力小于插管上提时对排水板的摩阻力，导致桩靴弹不开，从而导致整根回带现象（见图1b）。

Plastic drainage plate in the inserting depth to the design, because the friction force of gravity and the weight of soil drainage board, pile shoe than intubation during lifting of drainage plate friction, resulting in pile shoe bomb does not open, resulting in the whole back zone (see Figure 1b ).图1a：淤泥挤入管内图1b：摩擦力Figure 1A: silt into the tube map 1b: friction3、对塑料排水板回带现象的处理3, the plastic drainage plate with the phenomenon of the back3.1振动式插板机回带现象的处理：3.1 vibrating plate inserting machine back with the phenomenon of the:以往处理塑料排水回带现象，通常采用提高桩靴与插管底端结合处的密封性，但由于插管下沉遇较硬土层时，受振动锤上下振动力的影响，导致桩靴与插管之间局部产生间隙，土体极易挤入插管内，而造成排水板的回带现象。