Contant Us
ADD:509, No.306 A, Ningxia Road, Qingdao, China .
Tel:86-532-83780988
Fax:86-532-83896672
Mail:[email protected]
http://www.xxcein.tw
Q/A
1.Where will be suitable for using WBQ ground screw?
The WBQ ground screw can be widely used in sandy, clay, and gobi desert and so on soil,It cost only 1/4 labour and 1/3 raw material of that using cement foundation.
In addition, it can be also easily applied in the hard rock condition, by process as drilling hole firstly and then be filled with grout. Therefore, we can use the WBQ ground screw everywhere.
The correct model of WBQ ground screw should be made as per the detailed geological report from the enduser.
2.Can the WBQ ground screw be used in hard rock?
Sure. However, the drilling hole should be applied before using the WBQ ground screw.
3.Can the ground screw be used in asphalt soil?
Yes, drill the pre-hole firstly, and then apply grout at the bottom, finally the asphalt to be applied to keep the road even.
4.How to deal with when encountering stones during pile driving process?
The pre-hole is needed.After the WBQ ground screw driving into the hole,the hole should be filled into grout or others as per soil condition.
5.Can the ground screw be used in the backfilled geological condition? Any matters need attention?
Usually the backfilled soil should be compacted before set-up photovoltaic foundation. The main methods are as following opption:
1.Compaction in layers. The thickness of the layer is usually around 30cm.
2.Replacement method. The backfilled soil can be replaced by the lime soil or gravel to improve the bearing capacity.
3.Dynamic compaction. Compaction of the backfill soil.
4.Pressing in gravel. Press gravel into the backfill to compact the soil.
5.Filling in grout. Grout is applied around the ground screw to improve the bearing capacity.
6.The thickness for galvanized steel is related to different soils?
There is no direct relationship between the thickness of galvanized ground screw and the project soil. Firstly, the appropriate sort of ground screw depends on the geological report and the structure of the ground screw. Secondly, the purpose for galvanizing the ground screw is to prevent corrosion and improve the life. Therfore, we should consider the quality and type of steel primarily. Finally, the thicker wall of the ground screw has more thicker galvanizing layer than thin one.
7.How to prevent corrosion in saline-alkali soil and sea water by WBQ?
We have collaboration with the China national institute of oceanology and designed the most advanced anticorrosion methods by sacrificial anode protection. Besides, we have developed a new type of saline-alkali tolerant ground screw in light of the foreign experience, resolving the acute corrosion problem in saline-alkali soil.
8.Key factors affecting the WBQ ground screw’s bearing capacity and drawing force?
Soil condition. There is a positive correlation between the soil density and the bearing capacity. The tube diameter and length of the ground screw. There is a positive correlation between the width or length of the tube and the bearing capacity.
The diameter size of the spiral. There is a positive correlation between diameter size of the spiral and the bearing capacity and drawing force.
9.The bearing capacity and drawing force of WBQ ground screw with common size.
According to our worksite data, the popular size ground screw, with a diameter of 76 mm and length of 1600mm, have a drawing force of 1.5- 3 ton and bearing capacity of 3-5 ton.
10.In addition to the pull test, what else tests are required for WBQ ground screw?
There are 3 other tests: drawing force, loading power, horizontal torque force. WBQ has professional imported equipment and team to provide technical support service.
11.Any formula to calculate whether the WBQ ground screw’s structure is safe or not?
We can suggest the size of WBQ ground screw, after we analysis the mechanical static load and data. The engineer can confirm whether the recommended model of ground screw is suitable for the geological condition and installation requiement after site test.
12.Dose it have any effect on bearing capacity of WBQ ground screw for second piling, after taking out of the soil?
Sure. However, we have find a perfect resolution in light of many years of construction experience.
13.Is there any relationship between the structure design of helix with the soil condition and environment? For example, should the wider helix of ground screw be used in loose soil?
The wider the helix is, the stronger drawing force and holding power it can provide. We can use wider helix to improve drawing force and bearing capacity, under the condition that ensuring enough strength. This will save a lot of cost.
14.How to install the WBQ ground screw?
There are 2 major ways of installation:
1.Using the special machine—spiral piling machine. This machine can be sold and leased.
We have experienced and professional team to provide one stop service, including production of the ground screw, design of ground screw and stands, site early exploration, technical guidance and installation. The spiral piling machine can provide efficient work, with 300 times of piling each day. Besides, the machine can be operated by only one person, costing low labor strength. However, the drawback is the high cost of machine.
2.Using electric piling machine. It’s flexible, fit for any slope and with light weight. Besides, there is no need of training and professional drive license to operate the machine. However, the efficiency is low, with maximum of 90 times of piling one day. .
15.Can we install WBQ ground screw by ourselves?
Sure. The corollary equipment and technical support can be provided to their customer by WBQ.
16.WBQ ground screw’s system VS concrete foundation.

WBQ ground screw system

Concrete foundation

Low cost, saving time, energy-efficiency

3 times of cost and 4 times of construction period of WBQ ground screw

The WBQ Ground Screw is extremely environmental, and can be recycled.

Cannot recycle and environmental damage.

Almost not affected by the environmental impact, it also can construct in rainy day.

Influenced by various factors, such as drought, low temperature, rain and so on.

Lower price, avoid digging hole, construction with guarantee

It need dig hole and without guarantee of construction time

The WBQ Ground Screws are installed in a matter of minutes without digging and concrete. It is extremely environmental.

It need dig the hole, damage the fragile plateau ecology and difficult to recover.

Operation by only one person, low labor strength.

High quantity of equipment, high strength work, and labor-intensive

Construction with precise position, flexible during the drilling process.

High demand, not allow to fail, can not adjust during the progress

No restriction on installation in Later period. Piling and install support system at the same time

Need long time for curing, after concrete pouring.

Few of production material needing transport.

need precasted templates and transport of Cement and sand

Green and environmental protection,
No influence between generate electricity and graze

Difficult to dispose the deserted cement and recover the vegetation, after remove the power station.

17.C type steel foundation VS WBQ ground screw foundation?
There are some of big differences between C type steel foundation and WBQ ground screw foundation: The hard soil condition will be easily solved by WBQ ground screw.
WBQ ground screw uses single column system, (One of the thick stands replace the two of former stands). It can obtain higher bearing capacity.
C type of steel needs deeper penetration.
The number of C type steel depends on the capacity design of solar power system, as the WBQ ground screw.
18.Should we reserve enough space between the soil and the building structure?
Sure. The adequate reserve space between soil and building is very important.
The purpose of this is to avoid the frost which causes expansion of soil structure. The effect of ground screw will be heavily discounted, if the soil and building structure genital contact, because the frost will cause the expansion of soil structure, impacting the stability overall.
19.Is it necessary to increase the external cover of the ground screw, to prevent the influence of frozen soil on WBQ ground screw?
The frozen soil has no influence on galvanized ground screw. The principle of WBQ ground screw is to make the whole ground screw body fixed in soil structure and prevent shifting by the screw helix.
20.Without flange fixed support system, how to prevent settlement of WBQ ground screw only fixed by bolt?
It won’t happen if the design of system is reasonable.
21.The normal thickness of tube for WBQ ground screw?
Normally, it is around 3-8mm.
22.The thickness of galvanized layer of WBQ ground screw?
Usually it is 75-126μm.
23.Common length of WBQ ground screw above the ground?
In general, the length of the screw above the ground is based on customer’s requirement. If customer has no requirement, WBQ design team will suggest a suitable length according to the field survey results, integrated terrain, altitude of the sun, cost, flood tide and so on, and will construct after confirming with customer.
24.Recommended distance between WBQ ground screws.
Generally speaking, we recommend 245-305cm between two of WBQ ground screw.
25.The price of WBQ ground screw?
There are over hundreds of WBQ series products, the price is different from different size, model, thickness and galvanized layer. As the biggest manufacturer in China we could offer the best price to our buyer.
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