Tire

Abstract

The utility model provides a tire, which belongs to the technical field of tire pattern design and comprises a first longitudinal groove, a second longitudinal groove, a third longitudinal groove and a fourth longitudinal groove which continuously extend along the circumferential direction of a tire tread and are arranged from left to right along the radial direction of the tire tread, a central pattern block is defined between the second longitudinal groove and the third longitudinal groove; the central pattern block is composed of a plurality of sub central pattern blocks which are arranged along the circumferential direction of the tire tread; each sub central pattern block is provided with a first shallow groove, a second shallow groove, a third shallow groove, a fourth shallow groove, a plurality of fifth shallow grooves arranged in parallel and a plurality of sixth shallow grooves arranged in parallel. The utility model solves the technical problem that the existing tire cannot have excellent performance under various road conditions, and has the characteristics of skid resistance and noise reduction.

Description

Technical Field

[0001] This utility model belongs to the field of tire tread design technology, and in particular relates to a tire. Background Technology

[0002] The core concept of tire tread pattern design lies in improving driving performance and enhancing aesthetics by setting different shaped grooves and patterns on the tire surface. Tire tread groove designs are divided into three types: longitudinal, lateral, and diagonal. These different tread layouts significantly affect tire grip, water drainage performance, and handling. Generally speaking, longitudinal tread patterns are known for their excellent guidance and water drainage capabilities, while also producing lower noise and rolling resistance at high speeds. Lateral tread patterns are superior to longitudinal tread patterns in terms of driving and braking performance, but they have poorer lateral stability, are prone to greater slippage, and produce higher noise and rolling resistance. As for block tread patterns, they offer the best dynamic performance. The block arrangement of the tread pattern allows the pattern to penetrate deep into the ground when the vehicle is driving on snow or muddy roads, thereby generating effective driving force.

[0003] The choice of tire tread pattern depends on different needs. The design process is extremely complex and challenging. Multiple factors must be balanced during the design phase: for example, emphasizing grip may result in greater noise, while optimizing water drainage may affect the tire's high-speed rotation. In other words, focusing on one specific performance characteristic may negatively impact other performance aspects. With societal progress and evolving market demands, tire usage conditions have become more demanding. Tires must not only be suitable for short-distance driving but also meet the needs of medium- and long-distance travel.

[0004] Therefore, it is crucial to develop a product that performs well under various road surface conditions, and this product should have the characteristics of low heat generation, low noise, and low rolling resistance. Utility Model Content

[0005] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0006] This utility model proposes a tire that solves the technical problem that existing tires cannot perform well under various road conditions, and has the characteristics of anti-skid and noise reduction.

[0007] This utility model discloses a tire, including a first longitudinal groove, a second longitudinal groove, a third longitudinal groove, and a fourth longitudinal groove that extend continuously along the circumference of the tire tread and are arranged radially from left to right along the tire tread; a central tread block is defined between the second longitudinal groove and the third longitudinal groove; the central tread block is composed of a plurality of sub-central tread blocks arranged along the circumference of the tire tread; each sub-central tread block is provided with: a first shallow groove, the left end of which connects to the second longitudinal groove, and the right end of which connects to the third longitudinal groove, with the right end located to the lower right of the left end; a second shallow groove, the left end of which connects to the second longitudinal groove, and the right end of which connects to the third longitudinal groove, with the right end located to the upper right of the left end; the middle of the second shallow groove intersects with the middle of the first shallow groove, and a left sub-central tread is defined between the second shallow groove, the first shallow groove, and the second longitudinal groove. The block is defined by the second shallow groove, the first shallow groove, and the third longitudinal groove, which define a right sub-center patterned block. A third shallow groove is located on the left sub-center patterned block, parallel to the first shallow groove, with one end connected to the second longitudinal groove and the other end connected to the second shallow groove. A fourth shallow groove is located on the right sub-center patterned block, parallel to the first shallow groove, with one end connected to the third longitudinal groove and the other end connected to the second shallow groove. Several parallel fifth shallow grooves are located on the left sub-center patterned block, parallel to the second shallow groove, with one end connected to the first shallow groove and the other end connected to either the second longitudinal groove or the third shallow groove. Several parallel sixth shallow grooves are located on the right sub-center patterned block, parallel to the second shallow groove, with one end connected to the first shallow groove and the other end connected to either the third longitudinal groove or the fourth shallow groove.

[0008] In some embodiments, in two adjacent sub-center pattern blocks, the right endpoint of the first shallow groove on the upper sub-center pattern block intersects with the right endpoint of the second shallow groove on the lower sub-center pattern block at the third longitudinal groove; the left endpoint of the second shallow groove on the upper sub-center pattern block intersects with the left endpoint of the first shallow groove on the lower sub-center pattern block at the second longitudinal groove.

[0009] In some embodiments, the cross-sections of the first, second, third, and fourth shallow trenches are inverted arch shapes, and the bottom cross-sections are semi-circular; the bottom cross-sections of the fifth and sixth shallow trenches are straight; and the cross-sections of the plurality of parallel fifth and sixth shallow trenches are wavy.

[0010] In some embodiments, the first longitudinal groove and the fourth longitudinal groove are zigzag lines, while the second longitudinal groove and the third longitudinal groove are straight lines.

[0011] In some embodiments, the left side of the first longitudinal groove defines a left shoulder tread block, the right side of the fourth longitudinal groove defines a right shoulder tread block, a left middle tread block is defined between the first and second longitudinal grooves, and a right middle tread block is defined between the third and fourth longitudinal grooves.

[0012] In some embodiments, the shoulder portions of the left and right shoulder tread blocks are circumferentially distributed with several closed U-shaped grooves; and the left shoulder tread block near the first longitudinal groove and the right shoulder tread block near the fourth longitudinal groove are circumferentially distributed with several keyhole-shaped grooves.

[0013] In some embodiments, the right end of the lock-hole groove is connected to the first longitudinal groove, and the left end of the lock-hole groove is closed on the left shoulder tread block; or the left end of the lock-hole groove is connected to the fourth longitudinal groove, and the right end of the lock-hole groove is closed on the right shoulder tread block.

[0014] In some embodiments, the left middle patterned block has a plurality of first reinforcing ribs arranged circumferentially, the left end of the first reinforcing ribs being connected to the first longitudinal groove and the right end being connected to the second longitudinal groove; the right middle patterned block has a plurality of second reinforcing ribs arranged circumferentially, the left end of the second reinforcing ribs being connected to the third longitudinal groove and the right end being connected to the fourth longitudinal groove.

[0015] In some embodiments, the left and right ends of the first reinforcing rib and the left and right ends of the second reinforcing rib are inclined structures, and the width of the outer end opening of the inclined structure is greater than the width of the inner end opening.

[0016] In some embodiments, on the left middle patterned block, a plurality of serpentine 3D steel strip grooves are provided between two adjacent first reinforcing ribs; on the right middle patterned block, a plurality of serpentine 3D steel strip grooves are provided between two adjacent second reinforcing ribs.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention provides a tire with anti-skid and noise reduction functions. The tire tread consists of five staggered tread blocks and four tread grooves arranged along the lateral tread surface of the tire. The central tread block has several independent shallow grooves or parallel and densely packed shallow grooves (the fifth and sixth shallow grooves), which are interconnected with the tread grooves. This design reduces resonance and noise by preventing air blockage when the tread contacts the ground and reducing the number of closed tread grooves when the tread blocks contact the ground. In addition, the wave-like structure formed by the parallel and densely packed shallow grooves enhances drainage capacity and effectively breaks the water film on wet or waterlogged roads, ensuring excellent grip between the tire and the road surface, thereby ensuring vehicle driving safety. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the tire tread pattern structure provided in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0022] Figure 3 for Figure 1 A cross-sectional view along the BB direction;

[0023] Figure 4 for Figure 1 A cross-sectional view along the CC direction;

[0024] Figure 5 for Figure 1 A cross-sectional view along the DD direction;

[0025] Figure 6 for Figure 1 A cross-sectional view along the EE direction;

[0026] Figure 7 for Figure 1 A cross-sectional view along the FF direction;

[0027] Figure 8 for Figure 1 A cross-sectional view along the GG direction;

[0028] Figure 9 for Figure 1 A cross-sectional view along the HH direction;

[0029] Figure 10for Figure 1 A sectional view along direction II;

[0030] Figure 11 for Figure 1 A cross-sectional view along the JJ direction;

[0031] Figure 12 for Figure 1 A cross-sectional view along the KK direction;

[0032] Figure 13 for Figure 1 A cross-sectional view along the LL direction;

[0033] In the above figures: 101, First longitudinal groove; 102, Second longitudinal groove; 103, Third longitudinal groove; 104, Fourth longitudinal groove; 201, Central tread block; 2011, Left sub-central tread block; 2012, Right sub-central tread block; 202, Left shoulder tread block; 203, Right shoulder tread block; 204, Left middle tread block; 205, Right middle tread block; 301, First shallow groove; 302, Second shallow groove; 303, Third shallow groove; 304, Fourth shallow groove; 305, Fifth shallow groove; 306, Sixth shallow groove; 4, U-shaped groove; 5, Lockhole-shaped groove; 601, First reinforcing rib; 602, Second reinforcing rib; 7, Sloping structure; 8, Serpentine 3D steel sheet groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments provided by this utility model without inventive effort are within the scope of protection of this utility model.

[0035] This utility model embodiment provides a tire. Figure 1 This is a schematic diagram of the structure of a tire according to an embodiment of the present invention. (Reference) Figure 1As shown, the tire includes a first longitudinal groove 101, a second longitudinal groove 102, a third longitudinal groove 103, and a fourth longitudinal groove 104 that extend continuously along the circumferential direction of the tire tread and are arranged radially from left to right along the tire tread. A central tread block 201 is defined between the second longitudinal groove 102 and the third longitudinal groove 103. The central tread block 201 is composed of a plurality of sub-central tread blocks 201 arranged along the circumferential direction of the tire tread. Each sub-central tread block 201 is provided with: a first shallow groove 301, with the left end... A point connects to the second longitudinal groove 102, and the right end connects to the third longitudinal groove 103, with the right end located to the lower right of the left end; a second shallow groove 302 connects to the second longitudinal groove 102 at its left end and to the third longitudinal groove 103 at its right end, with the right end located to the upper right of the left end; the middle of the second shallow groove 302 intersects with the middle of the first shallow groove 301, and the second shallow groove 302, the first shallow groove 301, and the second longitudinal groove 102 define the left sub-center pattern block 2011. 302. The right sub-center patterned block 2012 is defined between the first shallow groove 301 and the third longitudinal groove 103; the third shallow groove 303 is located on the left sub-center patterned block 2011, parallel to the first shallow groove 301, with one end connected to the second longitudinal groove 102 and the other end connected to the second shallow groove 302; the fourth shallow groove 304 is located on the right sub-center patterned block 2012, parallel to the first shallow groove 301, with one end connected to the third longitudinal groove 103 and the other end connected to the second shallow groove 302. 02; Several parallel fifth shallow grooves 305 are located on the left sub-center pattern block 2011, parallel to the second shallow groove 302, with one end connected to the first shallow groove 301 and the other end connected to the second longitudinal groove 102 or the third shallow groove 303; Several parallel sixth shallow grooves 306 are located on the right sub-center pattern block 2012, parallel to the second shallow groove 302, with one end connected to the first shallow groove 301 and the other end connected to the third longitudinal groove 103 or the fourth shallow groove 304. In some embodiments, in two adjacent sub-center pattern blocks 201, the right end point of the first shallow groove 301 on the upper sub-center pattern block 201 intersects with the right end point of the second shallow groove 302 on the lower sub-center pattern block 201 at the third longitudinal groove 103; the left end point of the second shallow groove 302 on the upper sub-center pattern block 201 intersects with the left end point of the first shallow groove 301 on the lower sub-center pattern block 201 at the second longitudinal groove 102.

[0036] Among them, the tread blocks increase the contact area, improving safety and handling; the tread grooves drain water and mud, extending tire life, and the bottom of the grooves is equipped with stone-removing studs.

[0037] The aforementioned tire features anti-skid and noise reduction functions. The tire tread pattern consists of five staggered tread blocks and four tread grooves, arranged along the lateral tread surface. The central tread block 201 has several independent shallow grooves or parallel, densely packed shallow grooves (the fifth shallow groove 305 and the sixth shallow groove 306), forming a biomimetic snake scale tread pattern structure. These shallow grooves are interconnected with the tread grooves. This design reduces resonance and noise by preventing air blockage when the tread contacts the ground and reducing the number of closed tread grooves when the tread blocks contact the ground. In addition, the wave-like structure formed by the parallel, densely packed shallow grooves enhances water drainage capacity, effectively breaking the water film on wet or flooded roads, ensuring excellent grip between the tire and the road surface, thereby ensuring vehicle driving safety. It is suitable for various road conditions and guarantees good performance.

[0038] like Figure 11 , 12 As shown, the cross-sections of the first shallow ditch 301, the second shallow ditch 302, the third shallow ditch 303, and the fourth shallow ditch 304 are inverted arch shapes, and the bottom cross-section is semi-circular; the bottom cross-sections of the fifth shallow ditch 305 and the sixth shallow ditch 306 are straight; the cross-sections of the parallel fifth shallow ditch 305 and the parallel sixth shallow ditch 306 are wavy, which helps to reduce the closure of the patterned ditch, reduce noise, disrupt the water film, improve grip, and ensure safety. Preferably, the first shallow ditch 301, the second shallow ditch 302, the third shallow ditch 303, and the fourth shallow ditch 304 have a depth of 1mm and a width of 1mm, and the lower half of the cross-section is semi-circular with a radius of 0.5mm; the cross-sections of the fifth shallow ditch 305 and the sixth shallow ditch 306 are wavy, the depth is 1mm, the width is 1mm, and the bottom is a flat ditch structure.

[0039] In some embodiments, the first longitudinal groove 101 and the fourth longitudinal groove 104 are zigzag lines, while the second longitudinal groove 102 and the third longitudinal groove 103 are straight lines. The left side of the first longitudinal groove 101 defines a left shoulder tread block 202, the right side of the fourth longitudinal groove 104 defines a right shoulder tread block 203, a left middle tread block 204 is defined between the first longitudinal groove 101 and the second longitudinal groove 102, and a right middle tread block 205 is defined between the third longitudinal groove 103 and the fourth longitudinal groove 104. Furthermore, the width of the first longitudinal groove 101, the second longitudinal groove 102, the third longitudinal groove 103, and the fourth longitudinal groove 104 is 9-12 mm, and the bottom of the grooves is evenly equipped with stone-removing nails. The first longitudinal groove 101 and the fourth longitudinal groove 104 are staggered symmetrically, the second longitudinal groove 102 and the third longitudinal groove 103 are centrally symmetrical, and the width of each groove is equal. In addition, the second longitudinal ditch 102 and the third longitudinal ditch 103 have a depth of 10-11 mm and a ditch wall inclination of 12° from the center; such as Figure 2As shown, the depth of the first longitudinal trench 101 and the fourth longitudinal trench 104 is 11-12 mm, and the trench walls are inclined at 10° from the center. The stone-dispensing nails are columnar stone-dispensing nails, such as... Figure 3 As shown, these stone-removing rubber nails are 8.6mm long, spaced between 2-3mm apart, and 2mm high. By rationally designing the width of the longitudinal trench and the stone-removing rubber nails at the bottom of the trench, not only is the situation of stones being trapped on the road surface reduced when driving at high speeds reduced, but more importantly, these designs help to remove stones.

[0040] The left shoulder tread block 202 and the right shoulder tread block 203 are located on the tire shoulder and have frequent contact with the road surface. To optimize high-speed driving performance, several closed U-shaped grooves 4 are distributed circumferentially on the shoulder portion of the left shoulder tread block 202 and the right shoulder tread block 203. Furthermore, several locking-hole grooves 5 are distributed circumferentially on the side of the left shoulder tread block 202 near the first longitudinal groove 101 and the side of the right shoulder tread block 203 near the fourth longitudinal groove 104. Further, the right end of the locking-hole groove 5 connects to the first longitudinal groove 101, and the left end of the locking-hole groove 5 is closed on the left shoulder tread block 202; or the left end of the locking-hole groove 5 connects to the fourth longitudinal groove 104, and the right end of the locking-hole groove 5 is closed on the right shoulder tread block 203. The design of the locking-hole grooves 5 and the U-shaped grooves 4 helps to reduce the heat generated during high-speed driving.

[0041] Specifically, the left shoulder tread block 202 and the right shoulder tread block 203 have several U-shaped grooves 4 distributed circumferentially to reduce heat generation. Simultaneously, the sidewall tread patterns on both sides of the tire also include lock-hole shaped grooves 5 for reducing heat generation. The design of the lock-hole shaped grooves 5 and the U-shaped grooves 4 helps reduce heat generated during high-speed driving, improving overall tire performance and safety, and increasing tire lifespan.

[0042] Furthermore, such as Figure 4 As shown, the U-shaped groove 4 has a depth of 8mm and a width of 5mm. The bottom and sidewall are smoothly transitioned by a 1.5mm radius arc to ensure heat dissipation and structural strength. Figure 9 , Figure 10 As shown, the depth of the keyhole groove 5 is 4mm, the bottom radius of the groove is 1mm with a smooth arc transition, the width is 3mm, and the length is 6mm, which together reduce the heat generation during high-speed driving.

[0043] In some embodiments, the left middle tread block 204 has several first reinforcing ribs 601 arranged circumferentially, with the left end of the first reinforcing rib 601 connected to the first longitudinal groove 101 and the right end connected to the second longitudinal groove 102; the right middle tread block 205 has several second reinforcing ribs 602 arranged circumferentially, with the left end of the second reinforcing rib 602 connected to the third longitudinal groove 103 and the right end connected to the fourth longitudinal groove 104. The left and right ends of the first reinforcing ribs 601 and the left and right ends of the second reinforcing ribs 602 are inclined structures 7, and the width of the opening at the outer end of the inclined structure 7 is greater than the width of the opening at the inner end. The design of the reinforcing ribs helps to enhance the rigidity of the tire tread and reduce uneven tire wear.

[0044] The aforementioned left-side center patterned block 204 is divided by a first reinforcing rib 601, while the right-side center patterned blocks 205 are separated by second reinforcing ribs 602. Both ends of these reinforcing ribs are designed as bevels, with the outer opening wider than the inner opening. This design aims to prevent chipping during demolding in the vulcanization process. Figure 5 , 6 As shown in Figures 7 and 8, the width of both the first reinforcing rib 601 and the second reinforcing rib 602 is set to 2 mm, and the depth is 3 mm. The depth of the end where the inclined surface connects to the inner side of the reinforcing rib is 4 mm, while the depth of the end where it connects to the patterned groove is 6 mm.

[0045] In some embodiments, on the left middle patterned block 204, a plurality of serpentine 3D steel strip grooves 8 are provided between adjacent first reinforcing ribs 601; on the right middle patterned block 205, a plurality of serpentine 3D steel strip grooves 8 are provided between adjacent second reinforcing ribs 602. This helps to pierce the water film, effectively improve the grip on wet and slippery surfaces, and enhance driving traction. Furthermore, as... Figure 8 , 13 As shown, the width of the serpentine 3D steel strip groove 8 is 1-2mm and the depth is 3mm.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A tire, characterized in that, It includes a first longitudinal groove, a second longitudinal groove, a third longitudinal groove, and a fourth longitudinal groove that extend continuously along the circumferential direction of the tire tread and are arranged radially from left to right along the tire tread; a central tread block is defined between the second longitudinal groove and the third longitudinal groove; the central tread block is composed of a plurality of sub-central tread blocks arranged along the circumferential direction of the tire tread. Each sub-center patterned block is provided with: The first shallow ditch has its left end connected to the second longitudinal ditch and its right end connected to the third longitudinal ditch, with the right end located to the lower right of the left end. The second shallow groove has its left end connected to the second longitudinal groove and its right end connected to the third longitudinal groove. The right end is located to the upper right of the left end. The middle of the second shallow groove intersects with the middle of the first shallow groove. The second shallow groove, the first shallow groove and the second longitudinal groove define a left sub-center pattern block. The second shallow groove, the first shallow groove and the third longitudinal groove define a right sub-center pattern block. The third shallow groove is located on the left sub-center pattern block, parallel to the first shallow groove, with one end connected to the second longitudinal groove and the other end connected to the second shallow groove. The fourth shallow groove is located on the right sub-center pattern block, parallel to the first shallow groove, with one end connected to the third longitudinal groove and the other end connected to the second shallow groove. Several parallel fifth shallow grooves are located on the left sub-center pattern block, parallel to the second shallow groove, with one end connected to the first shallow groove and the other end connected to the second longitudinal groove or the third shallow groove. Several parallel sixth shallow grooves are located on the right sub-center pattern block, parallel to the second shallow groove, with one end connected to the first shallow groove and the other end connected to the third longitudinal groove or the fourth shallow groove.

2. The tire according to claim 1, characterized in that, In two adjacent sub-center pattern blocks, the right end point of the first shallow groove on the upper sub-center pattern block intersects with the right end point of the second shallow groove on the lower sub-center pattern block at the third longitudinal groove; the left end point of the second shallow groove on the upper sub-center pattern block intersects with the left end point of the first shallow groove on the lower sub-center pattern block at the second longitudinal groove.

3. The tire according to claim 1, characterized in that, The first, second, third, and fourth shallow trenches have inverted arch-shaped cross sections and semi-circular bottom sections; the fifth and sixth shallow trenches have straight bottom sections; and the cross sections of the plurality of parallel fifth and sixth shallow trenches are wavy.

4. The tire according to claim 1, characterized in that, The first longitudinal groove and the fourth longitudinal groove are in the shape of broken lines, while the second longitudinal groove and the third longitudinal groove are in the shape of straight lines.

5. The tire according to claim 4, characterized in that, The left side of the first longitudinal groove defines the left shoulder tread block, the right side of the fourth longitudinal groove defines the right shoulder tread block, the left middle tread block is defined between the first longitudinal groove and the second longitudinal groove, and the right middle tread block is defined between the third longitudinal groove and the fourth longitudinal groove.

6. The tire according to claim 5, characterized in that, The left and right shoulder tread blocks have several closed U-shaped grooves distributed circumferentially on their shoulder portions; and the left shoulder tread block near the first longitudinal groove and the right shoulder tread block near the fourth longitudinal groove have several keyhole-shaped grooves distributed circumferentially.

7. The tire according to claim 6, characterized in that, The right end of the lock-hole groove is connected to the first longitudinal groove, and the left end of the lock-hole groove is closed on the left shoulder tread block; or the left end of the lock-hole groove is connected to the fourth longitudinal groove, and the right end of the lock-hole groove is closed on the right shoulder tread block.

8. The tire according to claim 5, characterized in that, The left middle patterned block has several first reinforcing ribs arranged circumferentially, with the left end of the first reinforcing rib connected to the first longitudinal groove and the right end connected to the second longitudinal groove; the right middle patterned block has several second reinforcing ribs arranged circumferentially, with the left end of the second reinforcing rib connected to the third longitudinal groove and the right end connected to the fourth longitudinal groove.

9. The tire according to claim 8, characterized in that, The left and right ends of the first reinforcing rib and the left and right ends of the second reinforcing rib are inclined structures, and the width of the outer end opening of the inclined structure is greater than the width of the inner end opening.

10. The tire according to claim 8, characterized in that, On the left middle patterned block, there are several serpentine 3D steel strip grooves between two adjacent first reinforcing ribs; on the right middle patterned block, there are several serpentine 3D steel strip grooves between two adjacent second reinforcing ribs.

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