The feasibility analysis of a new anchor product by using combined SWOT and analytic hierarchy process

. A new GFRP-WPS panel is proposed, by using the combined SWOT and analytic hierarchy process, the feasibility of this new product is analyzed from both qualitative and quantitative aspects. The limitation of using one single method is solved. The reliability of analysis is strengthened. It is of great significance for grasp the market attributes of this product and enhances its competitiveness.


Introduction
Product design is one of the creative activities which can reveal the scientific and technological progress. It can also meet the needs of the community through a certain way. Product design covers a variety of areas of knowledge with a strength planning and purpose.
In recent years, product design has been studied by many researchers from design theory, design methods and other aspects. Deng [1] has summarized the basic theory of product design and technology, he also pointed out that product innovation is the core of industrial innovation and the focus of global economic competition. Liu and Shan [2] divided the product design into three stages, initial, middle and last stages. They established a design analysis method with user experience as the core, and the criterion of usability evaluation in product innovation design was proposed. Fu et al. [3] and Guo et al. [4] pointed out the poor quality of some products, resource consumption and the weakness in international competitiveness, green product design approach was proposed.
The factors of product system design are classified into function, structure, artificial, handsome and environment by Song [5]. The reliability of each factor was also evaluated by using analytical hierarchy process. The existing product design was summarized by Xu [6], he also pointed out that product design has a great influence on the feasibility of product.
The properties of wood-plastic composites were analyzed and summarized by Huang [7] and Yuan [8], the application of wood-plastic composites was studied comprehensively and systematically from the product design perspective. The removable composite panel combined by soil nailing retaining system which was invented by Li and Jia [9] use soil arch to balance the load of soil. The panel is square and fixed by soil nailing. The locator is used in this product and cannot cover the whole soil, which become the biggies drawback of this product. In raining season, soil become into plastic state, can even flow or break, this product will not be useful any more.
Considering the advantages and disadvantages of composite panel combined by soil nailing supporting system, a new type of supporting product made by soil nailing and wood-plastic panel is proposed. The product design process is introduced and the feasibility of this new product is evaluated by using combined hierarchy analysis and SWOT analysis method. Figure 1 shows the shape of wood-plastic composite panel. This panel use hexagon as face shape with width of 500mm to 1000mm and thickness of 15mm to 20mm. One of the panels can be fixed from the centre by soil nail, other panels can be installed around this fixed panel edge to edge. A neat and sealed support face can be formed by this process. These panels can be uninstalled conveniently and reused. This product has many advantages such as light weight, wrap-proof, easy to cut, easy to process and assemble and so on.

Anchorage of product
Nut is used for anchorage. The head of anchor is made of high strength glass fiber composites. The production technology of this type of composites is mature. This glass fiber composites is energy saving and environmental protection, and it is combined with the body of anchor closely. This anchor has advantages such as easy to install and remove, easy to adjust and fix panel well. In practical application, hole will be made on panel, soil nail will be passed through the panel, and the panel will be fixed. Panels are pre-assembled on paper according to the position of soil nails in order to determine the number of panels and determine the assembly sequence. Panels can be fixed on soil nails in sequence. This process makes the adjustment and subsequent construction much easier.
For poor soil condition such as stream-plastic soils, one slab can be used to connect two soil nails. This slab can enhance the stability of the panels by crossing the composite panels. Slab length is 200mm beyond the soil nail spacing at each end. The layout of the slabs is shown in Figure 2 These slabs can also be replaced by reinforcement mesh. Actual construction environment is complex and changing, slope angles also vary. Soil nail angle is usually down in the soil in a certain range (about 10°～15°), therefore, this cause the pad and the panel cannot fit closely. Cement can be poured into the gap between the pad and panel and enhance the stability of this system. The anchorage of panel by soil nail can be shown in Figure 3.

Construction technology of product
After the soil nails are installed, holes are made on the panel according to the diameter of the soil nail. Then panels are hung on the face of slope. The other panels are installed slot to slot hook and locked by waterproof glue. All the panels are locked together and waterproof. Figure 4 shows the process of assembly. Figure 4 The process of assembly.

The recyclability of product
The design of recyclability is the core part of the green product design. It not only requires product functionality, appearance and cost control, but also need to focus on recycling at the end of the product life cycle. The design of recyclability contains general design principles, economic consequences and environmental impact analysis and the structural design of reusable and removable.
An excellent product structural design simplifies the recovery process, reduces recovery costs and rationalizes the use of resources. Product recycling process can be summarized as the following steps. Firstly, remove the waste products and sort after the end of its useful life. Second, recycling of the waste product includes analysis, renovation and remodeling. Thirdly, reuse the products which have passed the inspection test. The difficulty demolition work on products is the most important and critical part in product recyclability design.
A new type of anchorage is used in this manuscript, anchor head is made of high-strength glass fiber composites, it is linked closely together with nails and easy to install and remove. Hexagonal panels made of composites are used. There is no gap between any two panels. The mosaic effect is excellent. The panels can also be uninstalled conveniently. Overall, this anchoring product has strong recyclability, less pollution to the environment and is sustainable.
3. The feasibility analysis of anchoring product by using modified SWOT analytical hierarchy process

Steps of the application of modified SWOT analytical hierarchy process
Analytical hierarchy process (AHP) is a qualitative and quantitative approach for decision making. AHP is based on objects, guidelines and programs et al. In SWOT analysis, S means 'Strengths', W means 'Weaknesses', O means 'Opportunity' and T means 'Threats'. S and W are internal factors, O and T are external factors. Hu [10] and Han [11] approved that combined analytical hierarchy process and SWOT analysis has advantages in enterprise competition analysis.
The combined analytical hierarchy process and SWOT analysis is used in this manuscript for the feasibility analysis of anchor product. Based on the sequence of the weight of each factor level, eigenvector method is used to enhance the reliability of the feasibility analysis. Better results for decision makers can be supplied. The specific steps are as follows： First, set up the AHP analysis model (as shown in Figure 5). Factors are classified based on the existed information. SWOT table is made and the AHP model is set up based on the relationship within and between factor levels. In the standard analytic hierarchy process requires factors within the group should not be too much, three most critical factors are selected in this manuscript.  sis of the n 1 shows th Secondly, ps are calcu ors within ime, the CR n Table 7. ach factor is unted for by ting process ental errors, ation. The 2, 3, … , 9 roups, then ps is higher p should be alyzed first, after weight e feasibility stency of all (1) (2) ence is.      Table 7 shows that all the judgment matrices passed the consistence test. The maximum consistency ratio is 5.2%, it is smaller than 10%. The strength group and the opportunity group have advantages than weakness group and threat group. This new anchor product has advantages respect to other products, it has potential to be accepted by the market. This new anchor product is also environmental friendly and potential opportunity in the market. The shortcomings of this product are low interests and not much application in real projects.

Conclusions
A new anchor product made of composite soil nail and wood-plastic panel is proposed. The outlook, anchorage and construction procedure are introduced. SWOT analytic hierarchy has been used to do the feasibility analysis for this new product. By using combined SWOT and hierarchy analytic method, the feasibility of this new product is evaluated from both quantity and quality. This new product has advantages than traditional anchor product in recyclability and environmental protection. Also the new SWOT analytic hierarchy method can be used by others for new products evaluation.