C型钢一种有一定截面形状和尺度的条型钢材，是钢材四大品种之一。依据断面形状，型钢分简单断面型钢和复杂断面型钢。济南c型钢拔出时应注意的问题有什么？

C-beam is a kind of strip steel with a certain section shape and size, which is one of the four major types of steel. According to section shape, section steel is divided into simple section steel and complex section steel. What are the problems that should be paid attention to when Jinan C-beam is pulled out?

1、在基坑回填后拔出c型钢时，拔桩前应细心研讨拔出次序和拔出时刻，不然拔出桩的振荡和拔出带土过多会引起地面沉降和位移，对已建地下结构形成危害，影响附近建筑物、结构物或地下管线的稳定。

1. When the C-shaped steel is pulled out after the foundation pit is backfilled, the pulling order and time shall be carefully discussed before the pile is pulled out. Otherwise, the vibration of the pile pulled out and too much soil pulled out will cause ground settlement and displacement, which will harm the existing underground structure and affect the stability of nearby buildings, structures or underground pipelines.

2、先用拉桩机夹住c型钢的桩头，振荡1min~2min，使c型钢周围的土壤松动，产生液化，降低土壤与桩的摩擦阻力，然后缓慢上拔。拔桩时，要注意打桩机的荷载。如果难以拔出或不能拔出，拔出的桩应中止。

2. First, clamp the pile head of the C-shaped steel with a pile pulling machine and shake it for 1min~2min to loosen the soil around the C-shaped steel and produce liquefaction, reduce the friction resistance between the soil and the pile, and then slowly pull it up. When pulling out the pile, pay attention to the load of the pile driver. If it is difficult or impossible to pull out, the pile pulled out shall be suspended.

拔桩的起点和次序：关于封闭式c型钢墙，拔桩的起点应留5根以上的转角桩。依据沉桩条件确定拔桩起点，需要时也可采用跳拉法。拔桩次序与打桩次序相反。

The starting point and sequence of pile extraction: For closed C-shaped steel wall, more than 5 corner piles shall be reserved at the starting point of pile extraction. The starting point of pile pulling shall be determined according to the conditions of pile driving, and the jump pull method can also be used when necessary. The pile pulling sequence is opposite to the pile driving sequence.

振荡与振荡拉拔：在拉拔桩时，可使用振荡锤使板桩锁口振荡以减小土层的附着力，从而使桩在拉拔过程中振荡。

Oscillation and oscillatory pulling: When pulling out piles, the oscillating hammer can be used to oscillate the sheet pile lock to reduce the adhesion of soil layer, so as to make the pile oscillate during the pulling process.

关于难以清理的板桩，可先用柴油锤振荡100mm~300mm，然后用振荡锤替换振荡和拉拔。对拉拔阻力大的c型钢型钢间歇振荡，每次振荡15分钟，连续振荡小于1.5h。

For the sheet piles that are difficult to clean, the diesel hammer can be used to oscillate 100mm~300mm first, and then the oscillating hammer can be used to replace the oscillating and drawing. For the C-section steel with large drawing resistance, the intermittent oscillation is 15 minutes each time, and the continuous oscillation is less than 1.5 h.

在生产c型钢的各个工序中，要做好定位导向作业，严格控制C型钢的双向垂直度，墙体全体垂直。一般靠近罐笼可避免渗水。以及锯末、粉煤灰、膨胀水泥等资料可采取中止的辅助办法。需要的时分应该好好使用。

In each process of producing C-shaped steel, the positioning and guiding work shall be done well, the two-way verticality of C-shaped steel shall be strictly controlled, and the wall shall be vertical. Generally, close to the cage can avoid water seepage. As well as sawdust, fly ash, expansive cement and other materials, the auxiliary method of suspension can be adopted. Use it when necessary.

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The relevant contents of the problems that should be paid attention to when the C-shaped steel is pulled out are explained here. If you have any doubts or needs about this, please come to our website http://www.jnhscg.com Ask!