Pavement paving structure and construction method thereof
By setting up the plug-in structure of upper and lower blocks on the road surface staggered up and down, the problem of water splashing on the surface during rainy days is solved, a more stable and comfortable walking experience is achieved, and the durability of the road surface structure is enhanced.
Patent Information
- Application Number
- CN202411601708.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-01-07
AI Technical Summary
On rainy days, when people walk on squares or landscape roads, sand or mud often splashes from the gaps in the surface layer, resulting in pollution and discomfort.
A pavement structure is adopted, including a square matrix structure with up and down staggered upper and lower cubes. The upper and lower cubes are fixed by the interlocking of four legs and grooves to form a four-way uniform down pressure, reducing the risk of rainwater impact and splashing, and through The design of the cushion and base layer isolates the influence of roadbed water vapor and water temperature.
It effectively reduces the probability of sand or mud water splashing on the surface during rainy days, provides a more comfortable walking experience, and improves the stability and durability of the road surface structure.
Smart Images
Figure CN119266050A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of road construction, and in particular to a road pavement structure and a construction method thereof. Background Art
[0002] Square pavements, landscape pavements, etc. generally use granite, permeable bricks, etc. as the surface layer, and the base layer is laid under the surface layer. The base layer is generally a sand layer or a soil layer.
[0003] On rainy days, when people walk on square pavement or landscape pavement and step on the surface layer, sand or muddy water often splashes from the gaps in the surface layer. These dirt splashes onto people's legs, contaminates their trouser legs and causes discomfort. Summary of the invention
[0004] In view of the above technical problems, the present application proposes a road paving structure and a construction method thereof to improve the situation in which sand or muddy water often splashes from the gaps in the surface layer when people walk on square pavement or landscape pavement and step on the surface layer on rainy days. To this end, the present application adopts the following technical solution.
[0005] In a first aspect, the present application proposes a road paving structure and adopts the following technical solution.
[0006] A road paving structure includes a surface layer, wherein the surface layer includes an upper square matrix and a lower square matrix.
[0007] The upper square array includes a plurality of identical upper blocks arranged in a horizontal and vertical alignment. Each of the upper blocks includes an upper plate and four legs vertically fixed to the lower surface of the upper plate. The lower square array includes a plurality of identical lower blocks arranged in a horizontal and vertical alignment. Each lower block has four grooves on its upper surface. The upper plate and the lower block have the same length and width.
[0008] There are cross seams between four adjacent upper blocks in the shape of a field, the center of the lower block is aligned with the center of the cross seam, and a foot of each upper block closest to the center of the cross seam is adapted to be inserted into one of the grooves.
[0009] By adopting the above technical solution, the upper and lower square arrays are staggered up and down, and the upper blocks are pressed on each corner of the four lower blocks. The four corners of each lower block are respectively pressed down by each corner of the four upper blocks. The downward pressure is uniform in four directions, and it is not easy to cause warping, stepping on empty space, etc. Specifically, the four corners of the upper block are pressed on each corner of the four lower blocks. Therefore, during long-term use: first, the direct impact of rainwater on the sand layer or soil layer below the lower square array is small, that is, the erosion effect of rainwater on the sand layer or soil layer is small, and the sand layer or soil layer is not easy to form pits and accumulate water. Secondly, on rainy days, people walk on the surface layer and step on the upper blocks. Due to the support of the four lower blocks, even if there is a pit and water under one of the lower blocks, it can provide sufficient support, and due to the downward pressure of the other three upper blocks supported by this lower block, this end of this lower block is not easy to be stepped on and sunken, so it is not easy to splash sand or muddy water, which effectively protects the human body.
[0010] A preferred solution of the road pavement structure is that the support leg is a quadrangular prism, the groove is a square column groove, and the cross-sectional shape and size of the support leg are the same as the cross-sectional shape and size of the groove.
[0011] By adopting the above technical solution, the upper block and the lower block are plugged in and fixed together, and are not easy to slide or deviate when stepped on by people. The plug-in structure of the quadrangular prism is adopted, the quadrangular prism is relatively strong and not easy to break, and it is not easy to slide when matched with the square column groove.
[0012] A preferred solution of the road pavement structure is that the support foot is a cylinder, the groove is a cylindrical groove, and the cross-sectional diameter of the support foot is equal to the cross-sectional diameter of the groove.
[0013] By adopting the above technical solution, the upper block and the lower block are plugged and fixed in a fitting manner, and are not easy to slide or deviate when stepped on by people. The surface of the cylinder is smooth and is less likely to break.
[0014] A preferred solution of the road paving structure is that the lower surface of the upper plate fits the upper surface of the lower block.
[0015] By adopting the above technical solution, the lower block provides strong support to the upper plate, and the upper plate is not easy to break during long-term use.
[0016] A preferred solution of the road paving structure is that the upper plate is in the shape of a regular quadrangular prism, and the lower block is in the shape of a regular quadrangular prism.
[0017] By adopting the above technical solution, the upper plate and the lower block can be evenly staggered to maintain a uniform structure.
[0018] A preferred solution of the pavement paving structure is that the lower square matrix also includes a plurality of corner blocks. The plurality of corner blocks surround the circumference of the plurality of identical lower blocks. The upper surfaces of the corner blocks at the four corners of the lower square matrix are each provided with a groove, which respectively connects with a total of four legs at the four corners of the upper square matrix. Except for the corner blocks at the four corners of the lower square matrix, the upper surfaces of the remaining corner blocks are each provided with two grooves, which respectively connect with one leg of each of the two adjacent upper blocks, so that all edge legs of the upper square matrix are inserted into the grooves of the plurality of corner blocks one by one.
[0019] By adopting the above technical solution, all the upper blocks at the edges are also supported, so that the pavement structure is firm and not easy to step on empty space.
[0020] A preferred solution of the road pavement structure is that the road pavement structure further comprises a base layer, a cushion layer and a roadbed from top to bottom. The base layer is arranged below the lower square array.
[0021] By adopting the above technical solution, the base layer receives and transfers the load of the surface layer, reduces the damaging effect of sharp objects on the surface layer, and penetrates water. The cushion layer diffuses the load stress and improves the water temperature of the roadbed to ensure that the strength, rigidity and stability of the surface layer and base layer are not adversely affected by changes in the water temperature of the roadbed. The roadbed bears the load and should have sufficient firmness, stability and durability.
[0022] A preferred solution of the pavement structure is that the material of the upper block is permeable brick or granite. The material of the lower block is permeable brick or granite. The material of the base layer is sand. The material of the cushion layer is crushed stone. The material of the roadbed is compacted soil.
[0023] By adopting the above technical solution, the permeable brick has good water permeability, the granite surface can be made relatively flat and beautiful, and it is comfortable to walk on. The base layer uses sand particles, which has good water permeability. The cushion layer uses crushed stone to isolate the influence of roadbed water vapor, water temperature, etc. on the base layer and surface layer.
[0024] On the second aspect, the present application proposes a construction method for a road pavement structure and adopts the following technical solution.
[0025] A construction method for the road pavement structure as described above, the construction method comprising: Excavation and finishing of roadbed: First, excavate the roadbed according to the design requirements, clean up the earth, and reach the design elevation. Then, check whether the longitudinal slope, transverse slope and edge line meet the design requirements, finish the roadbed, level and compact it, and get the roadbed. Paving of the cushion layer: 100-200mm thick crushed stone is laid on the roadbed as the cushion layer. The crushed stone particle size ranges from 5-60mm. Laying of the base layer: Use sand with a particle size of 0.3-5mm as the base material, lay it on the cushion layer, and the laying thickness is 30-60mm. Surface layer laying: first lay the lower layer square array on the base layer, and finally lay the upper layer square array on top of the lower layer square array.
[0026] By adopting the above technical solution, the roadbed provides support, and the cushion layer isolates the influence of water vapor and water temperature on the base layer and the surface layer. The base layer isolates the damage of sharp objects on the cushion layer to the surface layer. The surface layer is used for people to walk smoothly and comfortably.
[0027] A preferred solution for the construction method of the pavement paving structure is that laying the lower layer square array includes: first laying a plurality of the lower blocks aligned horizontally and vertically on the base layer to obtain a lower layer intermediate square array, and then laying the corner blocks on the surrounding side of the lower layer intermediate square array to obtain the lower layer square array.
[0028] Laying the upper square array includes: laying the upper blocks above the lower square array starting from a corner of the lower square array, laying the upper blocks in sequence horizontally or vertically until the lower square array is completely covered to obtain the upper square array.
[0029] By adopting the above technical solution, the lower square array is arranged in order, the lower blocks and corner blocks are not easy to be arranged incorrectly, and the blocks installed in front are not easy to interfere with the installation of the rear blocks. When all the upper blocks are installed, the lower blocks installed later are not easily interfered by the lower blocks installed in front, and the installation is convenient.
[0030] To sum up, the pavement paving structure and construction method of the present application have the following beneficial effects: the prepared upper and lower square arrays are staggered and supported at multiple points, which reduces the scouring effect of rainwater on the sand below the lower square array, reduces the risk of sand deviation and puddles, and reduces the probability of people walking on the square pavement or landscape pavement on rainy days, stepping on the surface layer, and splashing sand or muddy water from the surface layer gaps, thus giving people a comfortable feeling. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 A side view of the surface layer.
[0032] Figure 2 for Figure 1 Top view of the .
[0033] Figure 3 for Figure 2 Schematic diagram of the lower surface perspective of the upper array.
[0034] Figure 4 for Figure 1 Bottom view of .
[0035] Figure 5 for Figure 4 Schematic diagram of the upper surface perspective of the lower square array.
[0036] Figure 6 for Figure 1 A three-dimensional image of a partial explosion of the surface layer.
[0037] Figure 7 Schematic diagram of the bottom surface perspective of another upper square array.
[0038] Figure 8 Schematic diagram of the upper surface viewing angle of another lower square array.
[0039] Fig. 9 A side view of the pavement structure.
[0040] Figure numerals: 1, surface layer; 11, upper square array; 12, lower square array; 111, upper block; 1111, upper plate; 1112, support foot; 121, lower block; 1211, groove; 112, cross seam; 122, corner block; 2, base layer; 3, cushion layer; 4, roadbed. DETAILED DESCRIPTION
[0041] The present application is further described below with reference to the accompanying drawings.
[0042] See also Figure 1 A road paving structure includes a surface layer 1. The surface layer 1 includes an upper layer matrix 11 and a lower layer matrix 12.
[0043] See also Figure 2 , which is a perspective view of the upper surface of the upper square array 11. The upper square array 11 includes a plurality of identical upper blocks 111, which are arranged in parallel in the horizontal direction and in the vertical direction. There are gaps between adjacent upper blocks 111 in the horizontal and vertical directions, providing deformation space for the upper blocks 111 to expand and contract due to heat and cold.
[0044] See also Figure 3 , which is a perspective view of the lower surface of the upper square array 11, each upper block 111 has an upper plate 1111 and four legs 1112. The four legs 1112 are vertically fixed to the four corners of the lower surface of the upper plate 1111. For each upper plate 1111, the distance from each leg 1112 to the edge is equal, and it can be seen that the four legs 1112 surround a rectangle, preferably a square.
[0045] See also Figure 4, which is a perspective view of the upper surface of the lower square array 12. The lower square array 12 includes a plurality of identical lower blocks 121, which are arranged in a horizontal and vertical direction. There are gaps between adjacent lower blocks 121 in the horizontal and vertical directions, providing deformation space for the lower blocks 121 to expand and contract due to heat. The gaps between adjacent lower blocks 121 and the gaps between adjacent upper blocks 111 are equal in width, for example, both are 2 mm.
[0046] Since the multiple upper blocks 111 of the upper matrix 11 are arranged horizontally and vertically, and the multiple lower blocks 121 of the lower matrix 12 are arranged horizontally and vertically, the multiple upper blocks 111 in each row and the multiple lower blocks 121 in each row are parallel in the horizontal direction, and the multiple upper blocks 111 in each column and the multiple lower blocks 121 in each column are also parallel in the vertical direction.
[0047] See also Figure 5 , which is a perspective view of the lower surface of the lower square array 12, the upper surface of each lower block 121 has four grooves 1211. The depth of the groove 1211 can be half of the thickness of the lower block 121.
[0048] The upper plate 1111 and the lower block 121 have the same length and width, and can be both rectangular or square. For ease of construction, the upper plate 1111 is preferably square and the lower block 121 is also square, so that the upper plate 1111 and the lower block 121 can be repeatedly arranged to maintain a uniform structure.
[0049] See also Figure 6 , there is a cross seam 112 between the four adjacent upper blocks 111 in the shape of a field. A lower block 121 is supported at the middle position below the four adjacent upper blocks 111 in the shape of a field, and the center of the lower block 121 is aligned with the center of the cross seam 112. The four adjacent upper blocks 111 in the shape of a field mentioned above means that the four upper blocks 111 form a field shape, and each upper block 111 is a square of the field.
[0050] Among the four upper blocks 111 adjacent to each other in the shape of a field, a leg 1112 of each upper block 111 that is closest to the center of the cross seam 112 is adapted to be inserted into a groove 1211 of the lower block 121, that is, the four legs 1112 that are closest to the center of the cross seam 112 are adapted to be inserted into the four grooves 1211 of a lower block 121. The length of the leg 1112 can be equal to the depth of the groove 1211 to basically fill the groove 1211 and reduce water accumulation. The length of the leg 1112 can also be slightly smaller than the depth of the groove 1211 to eliminate the influence of material processing tolerance, so that the lower surface of each upper block 111 can fit with the upper surface of the lower block 121, increase the support area of the upper plate 1111, and make the upper plate 1111 not easy to break during long-term use.
[0051] like Figure 6 In addition to a lower block 121 supported at the lower middle position of four adjacent upper blocks 111 in a field shape, there are eight lower blocks 121 supported at the periphery of four adjacent upper blocks 111 in a field shape. The eight lower blocks 121 provide a total of twelve grooves 1211 for the twelve legs 1112 on the periphery of the four upper blocks 111 to fit and insert.
[0052] Since the lower square array 12 supports the upper square array 11 in a displaced manner, and the upper blocks 111 of the upper square array 11 have the same shape, in order to align the lower square array 12 with the upper square array 11, the lower square array 12 further includes a plurality of corner blocks 122. Figure 4 and Figure 5 As shown, a plurality of corner blocks 122 surround the circumference of a plurality of identical lower blocks 121. Among them, the upper surfaces of the corner blocks 122 at the four corners of the lower square array 12 are each provided with a groove 1211, which are respectively connected to the four legs 1112 at the four corners of the upper square array 11. Except for the corner blocks 122 at the four corners of the lower square array 12, the upper surfaces of the remaining corner blocks 122 are each provided with two grooves 1211, which are respectively connected to one leg 1112 of each of the two adjacent upper blocks 111, so that all the edge legs 1112 of the upper square array 11 are inserted into the grooves 1211 of the plurality of corner blocks 122 one by one. The above arrangement enables all the upper blocks 111 at the edges to be supported, so that the pavement structure is firmly constructed and not easy to step on.
[0053] The shape of the support leg 1112 can be as follows Figure 3 The quadrangular prism shown can also be Figure 7 Cylindrical shape shown.
[0054] If the support leg 1112 is a quadrangular prism, then Figure 5The cross-sectional shape and size of the support leg 1112 are the same as those of the groove 1211. The upper block 111 and the lower block 121 are plugged and fixed together, and are not easy to slide or deviate when stepped on. The plug-in structure of the quadrangular prism is adopted, and the plug-in cooperation of the support leg 1112 and the groove 1211 is not easy to shake.
[0055] If the support leg 1112 is a cylinder, then Figure 8 The groove 1211 is a cylindrical groove. The cross-sectional diameter of the support leg 1112 is equal to the cross-sectional diameter of the groove 1211. The upper block 111 and the lower block 121 are plugged and fixed together. The surface of the cylinder is smooth, the damage caused by collision is small, and it is not easy to break.
[0056] The above road pavement structure surface layer 1 is composed of an upper square matrix 11 and a lower square matrix 12 that are staggered up and down. The upper block 111 is pressed on each corner of the four lower blocks 121. The four corners of each lower block 121 are respectively pressed down by one corner of the four upper blocks 111. The downward pressure is uniform in four directions, and it is not easy to cause warping of edges, stepping on empty space, etc. Specifically, the four corners of the upper block 111 are pressed on each corner of the four lower blocks 121, and the upper and lower layers are staggered. Therefore, during long-term use: first, the direct impact of rainwater on the sand layer or soil layer below the lower square array 12 is very small, that is, the erosion effect of rainwater on the sand layer or soil layer is small, and the sand layer or soil layer is not easily eroded to form pits and become water pits; secondly, on rainy days, people walk on the surface layer 1 and step on the upper block 111. Due to the support of the four lower blocks 121, even if there is a pit and water accumulation under one of the lower blocks 121, the other three lower blocks 121 can provide sufficient support, and because the lower block 121 with the pit under it is also subject to the downward pressure of the other three upper blocks 111, the pit end of the lower block 121 is not easily stepped on and sunken, so that it is not easy to splash sand or muddy water, which effectively protects the human body.
[0057] The surface layer 1 is suitable for installation in various scenes such as square pavements, landscape walkways, park pavements, highway sidewalks, etc. On the premise of having a good water permeability effect, it can significantly reduce the adverse effects on people caused by pedestrians stepping on the surface layer 1 on rainy days, causing the single corner of the brick to sink and splash water.
[0058] like Fig. 9 In addition to the surface layer 1, the road pavement structure may also include a base layer 2, a cushion layer 3 and a roadbed 4 from top to bottom. The base layer 2 is arranged below the lower layer array 12.
[0059] Fig. 9The material selection and effects of each layer of the pavement structure are as follows: for the surface layer 1, the upper block 111 is a permeable brick or granite, and the lower block 121 is a permeable brick or granite. The permeable brick has good water permeability, and the granite surface can be made relatively flat and beautiful, providing a platform for pedestrians to walk smoothly and comfortably. The base layer 2 is sand particles with good water permeability. It receives and transfers the load of the surface layer 1, and blocks the sharp objects of the cushion layer 3 from stabbing the surface layer 1. The cushion layer 3 is gravel, which diffuses the load stress of the base layer 2, and can also isolate the influence of water vapor, water temperature, etc. of the roadbed 4 on the base layer 2 and the surface layer 1, so as to maintain the strength, rigidity and stability of the surface layer 1 and the base layer 2. The roadbed 4 is compacted soil, which provides support for the three layers above, so it should be compacted to have sufficient firmness, stability and durability.
[0060] Fig. 9 A construction method for the pavement structure is: 1. Excavation and finishing of roadbed 4: First, excavate the roadbed according to the design requirements, clean up the earth, and reach the design elevation. Then, check whether the longitudinal slope, transverse slope and edge line meet the design requirements, finish the roadbed 4, level it, roll it and compact it, and get the roadbed 4. 2. Laying of cushion layer 3: Lay 100-200mm thick crushed stones on the roadbed 4 as cushion layer 3, for example, the thickness of cushion layer 3 is 150mm. The crushed stones have a particle size range of 5-60mm. 3. Laying of base layer 2: Use sand with a particle size of 0.3-5mm as the base layer 2 material, lay it on the cushion layer 3, and the laying thickness is 30-60mm. For example, the thickness of the cushion layer 3 is 45mm. 4. Laying of surface layer 1: First lay all lower blocks 121 on base layer 2, align lower blocks 121 in horizontal and vertical directions to obtain lower middle square array, then lay all corner blocks 122 around lower middle square array to obtain lower square array 12. Then lay upper square array 11 on lower square array 12, lay the first upper block 111 from the corner, then lay upper blocks 111 in sequence horizontally or vertically until the laid multiple upper blocks 111 cover all lower square arrays 12, obtain upper square array 11, and complete the construction of the pavement structure. In summary of the above implementation methods, the upper square array 11 and the lower square array 12 prepared in the present application are staggered and supported at multiple points, which reduces the scouring effect of rainwater on the sand below the lower square array 12 and reduces the risk of sand shifting to form puddles. Due to the strong supporting effect, the probability of people walking on the square pavement or landscape pavement on rainy days, stepping on the surface layer 1, and splashing sand or muddy water from the gaps in the surface layer 1 is significantly reduced, thereby improving the pedestrian experience.
[0061] The above are only preferred embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various equivalent replacements and modifications can be made according to the above description, and these replacements and modifications should be included in the protection scope of the present application.
Claims
1. A road paving structure, characterized in that: It comprises a surface layer (1); the surface layer (1) comprises an upper square matrix (11) and a lower square matrix (12); The upper square array (11) comprises a plurality of identical upper blocks (111) arranged in a horizontal and vertical alignment; each of the upper blocks (111) comprises an upper plate (1111) and four legs (1112) vertically fixed to the lower surface of the upper plate (1111); the lower square array (12) comprises a plurality of identical lower blocks (121) arranged in a horizontal and vertical alignment; the upper surface of each lower block (121) has four grooves (1211); the upper plate (1111) and the lower block (121) are of equal length and width; A cross seam (112) is formed between four adjacent upper blocks (111) in a field shape, the center of the lower block (121) is aligned with the center of the cross seam (112), and a support leg (1112) of each upper block (111) that is closest to the center of the cross seam (112) is adapted to be inserted into one of the grooves (1211).
2. The road paving structure according to claim 1, characterized in that: The support foot (1112) is a quadrangular prism; the groove (1211) is a square column groove; the cross-sectional shape and size of the support foot (1112) are the same as the cross-sectional shape and size of the groove (1211).
3. The road paving structure according to claim 1, characterized in that: The support foot (1112) is a cylinder; the groove (1211) is a cylindrical groove; and the cross-sectional diameter of the support foot (1112) is equal to the cross-sectional diameter of the groove (1211).
4. The road paving structure according to claim 1, characterized in that: The lower surface of the upper plate (1111) is in contact with the upper surface of the lower block (121).
5. The road paving structure according to claim 1, characterized in that: The upper plate (1111) is in the shape of a regular quadrangular prism, and the lower block (121) is in the shape of a regular quadrangular prism.
6. The road paving structure according to any one of claims 1 to 5, characterized in that: The lower square matrix (12) further comprises a plurality of corner squares (122); the plurality of corner squares (122) surround the circumference of the plurality of identical lower blocks (121); the upper surfaces of the corner squares (122) at the four corners of the lower square matrix (12) are each provided with a groove (1211) for respectively connecting with a total of four legs (1112) at the four corners of the upper square matrix (11); except for the corner squares (122) at the four corners of the lower square matrix (12), the upper surfaces of the remaining corner squares (122) are each provided with two grooves (1211) for respectively connecting with one leg (1112) of each of two adjacent upper blocks (111), so that all edge legs (1112) of the upper square matrix (11) are inserted one by one into the grooves (1211) of the plurality of corner squares (122).
7. The road paving structure according to claim 6, characterized in that: The road pavement structure further comprises, from top to bottom, a base layer (2), a cushion layer (3) and a roadbed (4); the base layer (2) is arranged below the lower layer square array (12).
8. The road paving structure according to claim 7, characterized in that: The material of the upper block (111) is permeable brick or granite; the material of the lower block (121) is permeable brick or granite; the material of the base layer (2) is sand; the material of the cushion layer (3) is crushed stone; and the material of the roadbed (4) is compacted soil.
9. A construction method for a road pavement structure as claimed in claim 7 or 8, characterized in that: The construction method comprises: Excavation and finishing of roadbed (4): First, excavate the roadbed according to the design requirements, clean up the earthwork, and reach the design elevation; then, check whether the longitudinal slope, transverse slope and sideline meet the design requirements, finish the roadbed (4), level and compact it, and obtain the roadbed (4); Laying of the cushion layer (3): laying 100-200 mm thick crushed stones on the roadbed (4) as the cushion layer (3); the crushed stones have a particle size range of 5-60 mm; Laying of the base layer (2): Use sand with a particle size of 0.3-5 mm as the base layer (2) material, lay it on the cushion layer (3), and lay it with a thickness of 30-60 mm; Laying of the surface layer (1): first laying the lower layer square array (12) on the base layer (2), and finally laying the upper layer square array (11) on top of the lower layer square array (12).
10. The construction method of the road pavement structure according to claim 9, characterized in that: Laying the lower square array (12) comprises: firstly laying a plurality of lower blocks (121) aligned in a horizontal and vertical direction on the base layer (2) to obtain a lower intermediate square array, and then laying the corner blocks (122) on the periphery of the lower intermediate square array to obtain the lower square array (12); laying the upper square array (11) comprises: laying the upper blocks (111) above the lower square array (12) starting from a corner of the lower square array (12), and laying the upper blocks (111) in sequence in a horizontal or vertical direction until the lower square array (12) is completely covered to obtain the upper square array (11).