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Lock-tightened compartment

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Lock-tightened compartment

更新时间:2019-05-20 点击数:137

Geocell

Geotechnical cell is a three-dimensional mesh cell structure formed by high strength welding of reinforced HDPE sheets. Usually by ultrasonic needle welding. Because of Engineering needs, some holes are drilled on the diaphragm.

Characteristic

1. It is flexible and can be transported and stacked. During construction, it can be stretched into a net and filled with loose materials such as soil, gravel, concrete, etc. to form a structure with strong lateral restriction and large stiffness.

2. Light material, wear resistance, stable chemical performance, light and oxygen aging resistance, acid and alkali resistance, suitable for different soil and desert and other soil conditions.

3. Higher lateral restraint and anti-skid, anti-deformation and effective enhancement of subgrade bearing capacity and decentralized load.

4. Geotechnical dimensions such as height of geocell and welding distance can meet different engineering needs.

5. Flexibility, small transport volume, convenient connection and fast construction speed.

Basic principles

Geotechnical compartments have attracted the attention of engineering circles because of their outstanding effects. It should also start with their basic principles. When describing its principle in foreign literature, it is called "a three-dimensional honeycomb restriction system, which can significantly improve the performance of ordinary filling materials in load-bearing and insect erosion control applications in a large range." Its key principle is three-dimensional restriction. As we all know, when a car is driving in the desert, it will press out two deep ruts, the pressed part will sink deeply, and the two sides of the rut will rise high. If the vehicle behind continues to move along the rut, the subsidence part will sink further and the uplift part will rise further until the uplift part rubs against the chassis, and the subsided rut buries most of the wheels, thus unable to move forward. The reason is that when the external load acts on the surface of the foundation, according to Planter's theory and Taylor's theory, the active zone 1 is subjected to compression and subsidence under concentrated load, and the force is decomposed to the two sides of the transition zone 2, and the transitional zone 2 to the passive zone 3. The passive zone will rise and deform unconstrainedly.

Product characteristics:

1. Flexibility, transport can be folded, construction can be stretched into a network, filled with soil, gravel, concrete and other loose materials, to form a strong lateral constraints and stiffness of the structure.

2. Light material, abrasion resistance, chemical stability, light and oxygen aging resistance, acid and alkali resistance, suitable for different soil and desert and other soil conditions.

3. Higher lateral restraint and anti-skid, anti-deformation and effective enhancement of subgrade bearing capacity and decentralized load.

4. Geotechnical dimensions such as height of geocell and welding distance can meet different engineering needs.

5. Flexibility, small transport volume, convenient connection and fast construction speed. That is to say, once the load acts on the roadbed, the active area will be formed beneath the load, and then it will be extruded through the transition area, so that the passive area will uplift. That is to say, the bearing capacity of the foundation is determined by the shear forces along the slip line and the forces in the active, transitional and passive regions. Not only can we clearly understand the true process of the above principle on the sand base, but we can also find this kind of model on the soft foundation highway, but the rate of its formation is slower than that on the sand. Even better subgrade materials can not avoid its lateral movement. Generally, the roadbed of expressway is several meters higher than the ground. It is not easy to pour water into the ground, but the long-term settlement still exists. Rainwater infiltration, material loss and base sinking are some of the reasons. Under the action of long-term rolling and vibration of wheel load, lateral displacement of material to both sides of subgrade section is undeniably another very important reason. Taking highways at all levels in our province as an example, we can clearly feel that the road has been pressed out of a "S" trench belt on the main lane of the road. Some expressways are no exception. The bump on the lane is obviously stronger than that on the overtaking belt, especially in the bridge-road connection section (commonly known as "bridge-head jump"). The settlement of ditch subgrade is a typical example of lateral slip of subgrade material.

工程中常规处理路基的方法无需赘述,其目的就是提高地基材料的抗剪力和摩擦力,减少或延缓地基材料在荷载的压力或震动作用下发生移动的能力,因而工程中对材料的要求必然有许多苛刻的限制,如果不能就近获取所需材料,就需要外购这些材料,购买材料的费用和运输费用占去整个工程成本的很大部分。而使用土工格室就可以就地或就近取材,甚至可以使用在常规情况下不能使用的材料,从而大幅度减少材料购置费用和运输费用。为什么会这样呢?土工格室承载情况示意:在集中载荷作用下,受力的主动区1依然会把所受的力传递给过渡区2,但由于格室壁的侧向限制和相邻格室的反作用力,以及填料与格室壁的摩擦力所形成横向阻力,抑制了过渡区2和被动区3的横向移动倾向,从而使路基的承载能力得以提高。经过试验,在格室的限制作用下,中密砂的表观粘聚力可以增加三十几倍。很显然,如果能增加路基材料的抗剪力或抑制三个区域移动就可以取得提高地基承载力的效果,这就是土工格室的限制原理。土工格室作为一种新型的合成材料,在八十年代末九十年代初,欧美等国家就开始了大量的研发工作,并经试验和现场应用证明在提高一般填土承受动荷以及路基防护方面均有很大的功效。我国在九十年代初在吸收国外先进经验的基础上,开始了土工格室的开发研究工作,并在道路基床病害整治,固定松散介质的应用方面取得了重大突破。随着人们对土工格室特性的进一步了解,已经发现其具有其它土工材料(土工布、土工膜、土工格栅、土工模袋、土工网等)不可替代的优势,使其在诸多领域有着独特的应用前景。




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