Application of Polymer Plastic Sheet Pile in Foundation Pit of Civil Engineering and Hydraulic Engineering

Polymer plastic sheet pile is a fast, efficient, environmentally friendly form of pile. Light weight, high strength, good sealing performance; corrosion resistance, weather resistance, long service life; reusable and recyclable; in line with national advocacy “plastic strip”, “plastic and wood” new materials Energy saving and environmental protection policy. The products adopt industrialized mass production and mechanized construction, with high efficiency and short construction period (one-thirtieth of the traditional stone embankment construction). The construction cost is low (two thirds of the traditional stone embankment construction, Steel sheet pile construction of one-half).

Polymer plastic sheet pile to make up for the traditional concrete slope works embankment large amount of time, labor time, labor costs, high cost, difficult to repair and other steel sheet pile corrosion and rust, not environmental protection, cost of high cost. Can be widely used in irrigation and irrigation channels, aqueducts, small and medium-sized reservoir dam construction and maintenance, embankment revetment; construction of the pit support, slope protection, retaining wall, wall, flowerpot, impermeable wall Underground damings, dock construction, dock construction; disaster prevention and mitigation projects flood control, dam reinforcement heightened, the construction of roads and tunnels, road construction, Anti-collapse, anti-seepage, anti-debris flow, wind and sand; marine development of the embankment around the building, anti-wave wall, aquaculture, saline base breeding base Wai construction areas.

At present, polymer plastic sheet pile has been widely used in Canada, the United States, Britain, Germany, Poland and other developed countries.

FRP sheet pileDynamic Response of a Sheet Pile of Fiber-Reinforced Polymer for Waterfront Barriers

This paper presents the results from a combined experimental and advanced computational study to understand the dynamic response of a pultruded fiber-reinforced polymer (FRP) sheet pile of 9 m length that is installed into the ground near Venice, Italy. The peak embedment force of 10 kN is applied at the top as a sinusoidal compression force having a maximum frequency of circa 760 Hz. Physical measurements from accelerometers are reported for the lateral deformation response of a single sheet pile and of a unit restrained by an installed waterfront barrier. A finite-element modeling methodology for the two test configurations is developed by using the Strand7 code, so that advanced computational results can be compared against the field application measurements. Closed-form equations for the fundamental frequency are developed, with one accounting for the presence of rotary inertia and shear deformation. Dynamic responses at different embedment lengths (1–7 m) are examined, and a very good correlation is found between theory and practice. Numerically, the performance of the FRP sheet pile is compared with the response of a fictitious sheet pile of steel and with two new FRP geometries that increase stiffness to minimize flexure about the minor axis of bending. By increasing the mass by 10%, the maximum lateral displacement can be the same as the steel unit and 1/20 of the tested FRP unit. Findings of the research demonstrate that the FRP unit can be installed by using the same pile driving rig and procedure for steel sheet piling.

(This article comes from National Academy of Sciences editor released)

Durability of Fiberglass Composite Sheet Piles in Water

The durability of fiberglass composite sheet piles in water was studied through the specimens cut from flanges and webs of pultruded sheet pile sections. The experiments were performed to evaluate the water absorption at ambient temperature in complete immersion, and its effect on the tensile properties and the freeze-thaw resistance of the saturated composites. The high temperature at 70°C70°C was used to accelerate the tests, and 100°C100°C (boiling water) to verify the state of saturation. The non-Fickian absorption behavior of the pultruded composites was modeled based on the Berens and Hopfenberg two-phase absorption theory to predict the long-term performance and the change in mechanical properties of saturated composites. The results indicated that the water absorption process of the pultruded sheet pile composites followed a combination of Fickian diffusion and polymeric relaxation. The percent absorption at saturation was about 1.72% for the flange and 3.11% for the web. The water absorption model predicted that saturation would be reached after 5.8 years for the flange and after 14.5 years for the web immersed in tap water at ambient temperature. The tensile strength was found to decrease initially with the increase in the percent water absorption, and finally stabilize at the state of saturation. On the other hand, there was no noticeable change in the tensile modulus of elasticity during the entire water-aging period. The saturated composites showed excellent resistance to freeze-thaw cycling from 4.44.4 to −17.8°C.

(This article comes from American Society of Civil Engineers editor released)

Shallow or Domestic Excavations about Trench Safety

The images above and below were taken on a couple of larger projects i have been involved with however the majority of domestic drainage is in the great scheme of things fairly shallow, and you are unlikely to be using trench boxes and trench sheets if you are a DIYer.

There is as much danger involved in excavating the first metre (depth) of a dig as there is the next three or four, one of the main reasons is that the majority of things that are likely to spoil your day such as gas, water, electric and cable services will be within that depth.

If you have pulled up on site with an excavator, trench box and banks man you would assume that these hazards have been taken into account it is however the guy with the pick axe and wheel barrow looking to repair a defective gully pot that will not have considered where the water or gas main enters the property.

There are of course strict guidelines as to where and at what depth any service pipe, cable or duct should be buried both outside and inside of the curtilidge of any property, unfortunately the gangs that installed many of these services were paid by the yard and corners were often cut, it is not uncommon to find gas, water and even electric cables concealed within concrete hard standings or within the sub-base that supports tar-mac or flagged driveways.

In the last 15 years there has been a massive installation program with regard to cable communications beneath our highways and footpaths and to some degree these were monitored by various bodies, however once the installation entered the home owners side of the boundary anything went and we find cables inches beneath flower beds and lawns or pushed into joints between flag stones and then covered with sand and cement pointing, we even find the cables lay above ground beneath hedgerows but concealed with leaves and debris. Cutting through one of these cables will not be life threatening but the cost of renewing a section (they apparently can not be repaired so you have to renew complete lengths) will make your eyes water especially if you are not insured.

Another issue with domestic excavations is where to store the spoil, if you excavate a metre deep trench and store the spoil at the side you may as well be in a 1.5mtr deep hole when the trench sides collapse and the spoil slides in. There is an old saying used by the canal navies `dig deep, throw well back` presumably for this very reason.