A device for treating bridge head vehicle jumping based on negative Poisson's ratio hexagonal reinforced soil

Abstract

The invention discloses a device for treating a vehicle jumping at a bridge head based on a negative Poisson's ratio inner hexagon reinforced soil, comprising a negative Poisson's ratio metamaterial structure, the negative Poisson's ratio metamaterial structure comprising a first negative Poisson's ratio metamaterial structure, the first negative Poisson's ratio metamaterial structure being buried at the slope surface where the road surface on both sides is connected to the abutment, the first negative Poisson's ratio metamaterial structure being formed by a uniform array of multiple negative Poisson's ratio unit cell structures, the negative Poisson's ratio metamaterial structure being buried at the slope surface where the road surface on both sides is connected to the abutment, the cross section of the negative Poisson's ratio unit cell being a hollow inner hexagon, the negative Poisson's ratio unit cell being composed of reinforced soil, and the inner cavity of the negative Poisson's ratio unit cell being filled with soil layers. The device has a simple structure and strong operability, and can cope with different differential settlements at the same time, thus having a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, in particular to a device for treating bridge head vehicle jumping based on negative Poisson's ratio inner hexagon reinforced soil. Background Art

[0002] The roadbed in (super) soft soil areas has produced significant uneven settlement due to many factors such as long-term vehicle loads and self-consolidation. Especially on both sides of short-span bridges on urban roads, excessive uneven settlement has made the bridge head jump problem very serious, seriously affecting driving comfort, and also endangering driving safety and the safety of bridge structures. Although it is now known in the industry that the bridge head jump problem is caused by uneven settlement of bridge foundation and foundation soil, there has been no good treatment method so far. The bridge head jump phenomenon in (super) soft soil areas is still very serious, and practical engineering measures are urgently needed.

[0003] In order to solve the above problems, a hydraulic rod device or other artificial height adjustment device is usually set in the transition section. The height adjustment device requires manual monitoring of its settlement. Manual entry into the transition section to adjust the height of the hydraulic rod device or other devices requires a lot of manpower for monitoring and maintenance, which increases costs and cannot be adjusted at any time. Summary of the invention

[0004] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide a device for treating bridge head bouncing based on negative Poisson's ratio hexagonal reinforced soil, which is simple and easy to operate, and can cope with different differential settlements, so it has a wide range of applications.

[0005] The present invention is completed by adopting the following technical scheme: a device for handling bridge head bouncing based on negative Poisson's ratio internal hexagon reinforced soil, including a negative Poisson's ratio metamaterial structure, the negative Poisson's ratio metamaterial structure including a first negative Poisson's ratio metamaterial structure, the first negative Poisson's ratio metamaterial structure is buried in the slope surface where the road surface on both sides connects with the abutment, the first negative Poisson's ratio metamaterial structure is formed by a uniform array of multiple negative Poisson's ratio unit cell structures, the negative Poisson's ratio metamaterial structure is buried in the slope surface where the road surface on both sides connects with the abutment, the cross-section of the negative Poisson's ratio unit cell structure is a hollow internal hexagon, the negative Poisson's ratio unit cell structure is composed of reinforced soil, and the inner cavity of the negative Poisson's ratio unit cell structure is filled with a soil layer.

[0006] Furthermore, the adjacent negative Poisson's ratio unit cell structures are connected by geotechnical reinforcement bars.

[0007] Furthermore, the outer cross section and the inner cross section of the negative Poisson's ratio unit cell structure are both inner hexagons.

[0008] Furthermore, a reinforced steel mesh structure with ribs is laid above the negative Poisson's ratio metamaterial structure. The steel mesh structure is composed of a plurality of transverse steel bars and longitudinal steel bars interlaced with each other. The longitudinal steel bars in the steel mesh extend outward toward the end of the bridge head, and the extended ends of the longitudinal steel bars are bent toward the abutment, penetrate into the abutment, and are tied and welded to the steel bars in the abutment.

[0009] Furthermore, the external structure is composed of multiple rods, which are arranged in a circle with the central axis of the upper support plate and the lower support plate as the axis. The two sides of the rods are convex outward, and the middle of the rods are arc-shaped and concave toward the internal elastic structure.

[0010] Furthermore, the internal elastic structure includes an upper spring sleeve, a lower spring sleeve and an elastic member, the top of the upper spring sleeve is fixed to the lower end of the upper support plate, the bottom of the lower spring sleeve is fixed to the upper end of the lower support plate, the lower spring sleeve is sleeved in the upper spring sleeve, the inner walls of the upper spring sleeve and the lower spring sleeve form a telescopic space, the elastic member is installed in the telescopic space, and the upper spring sleeve can slide up and down along the lower spring sleeve.

[0011] Furthermore, an upper spring seat is arranged in the inner cavity of the upper spring sleeve, the inner side wall of the upper spring sleeve has at least one strip guide groove, the outer wall of the lower spring sleeve has a guide block, the guide block is sleeved in the strip guide groove and can move along the strip guide groove, the lower spring seat is arranged in the inner cavity of the lower spring sleeve, and the two ends of the elastic member are respectively fixed on the upper spring seat and the lower spring seat.

[0012] In the present invention, the "negative Poisson's ratio metamaterial structure" is obtained by combining the inner hexagonal unit cell structure according to a certain rule. Under the compression of the vertical load on the road surface, the metamaterial will have a certain amount of expansion characteristics due to its negative Poisson's ratio characteristics. The long-term settlement can be estimated according to the soil layer conditions and vehicle load characteristics, and then combined with the inner hexagonal material characteristics, a reasonable hexagonal unit cell size (side length, angle and height) is designed, so that when the uneven settlement reaches the level that needs to be regulated, the compressive expansion of the "metamaterial" roadbed is basically consistent with the settlement of the roadbed, thereby intelligently controlling the uneven settlement and effectively controlling the bridge head jumping problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention has the following accompanying drawings:

[0014] Figure 1 It is a schematic structural diagram of a device for treating a vehicle jumping at a bridge head based on negative Poisson's ratio hexagonal reinforced soil in the first embodiment;

[0015] Figure 2 Schematic diagram of the structure of the negative Poisson's ratio unit cell structure in the first embodiment;

[0016] Figure 3It is another structural schematic diagram of a device for treating a vehicle jumping at a bridge head based on negative Poisson's ratio hexagonal reinforced soil in the first embodiment;

[0017] Figure 4 It is a structural diagram of the steel mesh;

[0018] Figure 5 It is a structural schematic diagram of a device for treating a vehicle jumping at a bridge head based on negative Poisson's ratio hexagonal reinforced soil in the second embodiment;

[0019] Figure 6 for Figure 5 Schematic diagram of the structure of the second negative Poisson's ratio metamaterial structure;

[0020] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the internal elastic structure;

[0021] Figure 8 for Figure 7 Schematic diagram of the structure of the second negative Poisson's ratio metamaterial structure arranged in a single row and multiple columns;

[0022] Fig. 9 for Figure 7 Schematic diagram of the structure of the second negative Poisson's ratio metamaterial structure arranged in multiple rows and columns. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Reference Figure 1-Figure 2As shown, the first embodiment of the present invention provides a device for handling bridge head bounce based on negative Poisson's ratio inner hexagon reinforced soil, including a negative Poisson's ratio metamaterial structure. The negative Poisson's ratio metamaterial structure includes a first negative Poisson's ratio metamaterial structure, which is formed by a uniform array of multiple negative Poisson's ratio unit cell structures 3. The adjacent negative Poisson's ratio unit cell structures 3 can be connected by geotechnical reinforcement 8, so that multiple negative Poisson's ratio unit cell structures form a whole. The first negative Poisson's ratio metamaterial structure is buried in the base layer of the slope surface 1 where the roadbed surfaces on both sides are connected to the abutment 2. The outer edge of the first negative Poisson's ratio metamaterial structure has multiple hollow trapezoidal structures, the inner cavity of the hollow trapezoidal structure is filled with soil layers, and the hollow body structure is located between adjacent negative Poisson's ratio unit cell structures 3. The negative Poisson's ratio unit cell structure 3 is composed of reinforced soil, the cross-section of the negative Poisson's ratio unit cell structure 3 is a hollow inner hexagon, and the inner cavity of the negative Poisson's ratio unit cell structure 3 is filled with soil layers 4. Among them, the reinforced soil is obtained by adding reinforcement materials into the soil layer. The external cross section and the inner cavity cross section of the negative Poisson's ratio unit cell structure 3 are both hexagonal. The size of the negative Poisson's ratio unit cell structure 3 can be estimated according to the soil layer conditions and vehicle load characteristics. Long-term settlement is estimated, and then combined with the material properties of the inner hexagon to design. The size of the negative Poisson's ratio unit cell structure 3 includes side length, angle and height. The setting range of the negative Poisson's ratio structure can be calculated and determined according to the design documents in the actual project (such as based on the long-term compression settlement of the soil as a control indicator, etc.).

[0025] The device combines the inner hexagonal unit cell structure according to a certain rule to obtain the "metamaterial". Under the compression of the vertical load of the road surface, the negative Poisson's ratio metamaterial will have a certain amount of expansion characteristics due to its negative Poisson's ratio characteristics. When the uneven settlement reaches the level that needs to be regulated, the compression expansion of the "metamaterial" roadbed is basically consistent with the settlement of the roadbed, thereby more intelligently controlling the uneven settlement and effectively controlling the bridge head jumping problem, which is particularly suitable for the bridge head jumping problem of existing bridges that have already produced large differential settlements.

[0026] For further reference, Figure 3-Figure 4 As shown, a reinforced steel mesh structure with ribs is laid on top of the negative Poisson's ratio metamaterial structure, and the steel mesh 5 structure is composed of a plurality of transverse steel bars 51 and longitudinal steel bars 52 interlaced. The longitudinal steel bars in the steel mesh extend outward toward the end of the bridge head, and the extended end 53 of the longitudinal steel bars is bent toward the abutment, and penetrates into the abutment and is fixed by binding and welding with the steel bars in the abutment. By extending the longitudinal steel bars into the abutment, binding and welding with the steel bars in the abutment and then fixing them by grouting, the connection strength between the abutment and the roadbed is enhanced, and the bearing capacity of the connection between the abutment and the roadbed is improved. At the same time, when the roadbed or the connection between the roadbed and the bridge head is subjected to vehicle loads, the stress is dispersed by the steel mesh, so that the first group of negative Poisson's ratio metamaterial structures are evenly compressed, and the expansion property is generated based on the negative Poisson's ratio characteristics, absorbing longitudinal energy, controlling uneven settlement, and effectively controlling the problem of vehicle jumping at the bridge head.

[0027] Reference Figure 5-Figure 9 As shown, the second embodiment of the present invention provides a device for treating bridge head bounce based on negative Poisson's ratio inner hexagon reinforced soil, which is basically the same as the first embodiment, except that: the negative Poisson's ratio metamaterial structure includes two groups of negative Poisson's ratio metamaterial structures, and the first negative Poisson's ratio metamaterial structure is buried in the base layer of the slope surface 1 where the roadbed surface on both sides connects with the abutment 2 (see the first embodiment for details). A transition area 6 is set between the rigid abutment and the roadbed surface connection, and the second group of negative Poisson's ratio metamaterial structures are set in the transition area inner cavity, and the upper and lower ends of the second group of negative Poisson's ratio metamaterial structures are respectively against the upper and lower end inner walls of the transition area inner cavity. Preferably, the second negative Poisson's ratio metamaterial structure is located below the steel mesh structure, and the second negative Poisson's ratio metamaterial structure can be directly fixed below the steel mesh structure, which is convenient for the installation of the second negative Poisson's ratio metamaterial structure. The two groups of negative Poisson's ratios are used to control the roadbed slope and the intersection of the roadbed surface and the abutment, and the negative Poisson's ratio characteristics are used to control the uneven settlement, thereby effectively controlling the bridge head bounce problem.

[0028] Specifically, the second group of negative Poisson's ratio metamaterial structures includes a plurality of rod-shaped cell bodies 7, and the plurality of rod-shaped cell bodies 7 are evenly arranged in the inner cavity of the transition region. Preferably, the plurality of rod-shaped cell bodies 7 may be arranged in a single row and multiple columns in the inner cavity of the transition region 6 (refer to Figure 8 as shown) or multiple rows and columns (refer to Fig. 9 The rod-shaped cell body 7 is composed of an upper support plate 71, a lower support plate 72, an internal elastic structure 73 and an external structure 74, wherein the internal elastic structure 73 is spliced ​​inside the external structure 74, and the upper and lower ends of the internal elastic structure 73 and the external structure 74 are respectively connected to the upper support plate 71 and the lower support plate 72 (refer to Figure 6 as shown).

[0029] refer to Figure 7As shown, the internal elastic structure 73 includes an upper spring sleeve 731, a lower spring sleeve 732 and an elastic member 733. The top of the upper spring sleeve is fixed to the lower end of the upper support plate 71, and the bottom of the lower spring sleeve is fixed to the upper end of the lower support plate 72. The lower spring sleeve has a lower open end, and the upper spring sleeve has an upper open end. The lower spring sleeve is sleeved in the upper spring sleeve. The inner walls of the upper spring sleeve 731 and the lower spring sleeve 732 form a telescopic space for the installation of the elastic member. The telescopic space limits the range and direction of movement of the elastic member to prevent the return spring from running in other directions. The upper spring sleeve 731 is provided with an upper spring seat 734 in the inner cavity, and the lower spring seat 737 is provided in the inner cavity of the lower spring sleeve. The two ends of the elastic member are respectively fixed on the upper spring seat 734 and the lower spring seat 737. The elastic part 733 is preferably a return spring. The inner wall of the upper spring sleeve has at least one strip guide groove 735, the outer wall of the lower spring sleeve 732 has a guide block 736, the bottom of the strip guide groove has a limit block 738, the end of the limit block facing the strip guide groove has a buffer pad 739, the guide block is sleeved in the strip guide groove and can move along the strip guide groove, so that the upper spring sleeve can slide up and down along the lower spring sleeve. When the second negative Poisson's ratio metamaterial structure is subjected to vertical force, the elastic part limits the range of vertical deformation, improves the elastic modulus of the structure, absorbs part of the top load, and prevents the external structure from being subjected to excessive force and affecting the performance of its negative Poisson's ratio characteristics.

[0030] The external structure 74 is composed of a plurality of rods 741, which are arranged in a circle with the central axis of the upper support plate and the lower support plate as the axis, wherein the rods are distributed in the circumferential direction to form a geometrically stable structure. The rods are preferably M-shaped, that is, the two sides of the rods 741 are convex outward, and the middle of the rods are arc-shaped and concave toward the internal elastic structure. The external structure forms a negative Poisson's ratio structure, and the internal unit improves the elastic modulus of its structure. The internal and external structures are adopted to improve the durability of the second negative Poisson's ratio metamaterial structure and extend its service life. The transition area between the rigid abutment and the roadbed surface is a severely affected area where uneven settlement occurs. The second negative Poisson's ratio metamaterial structure is set in the transition area, and the elastic part of the internal elastic structure absorbs the vertical load energy and limits the range of vertical deformation, which is conducive to the external structure to exert a good negative Poisson's ratio effect. The cooperation between the internal elastic structure and the external structure is more effective in controlling uneven settlement and coping with different differential settlements. Therefore, it has a wide range of applications, especially for the connection joints between the abutment and the roadbed where settlement is most likely to occur.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device for treating bridge head vehicle jumping based on negative Poisson's ratio hexagonal reinforced soil, characterized by: It includes a negative Poisson's ratio metamaterial structure, the negative Poisson's ratio metamaterial structure includes a first negative Poisson's ratio metamaterial structure, the first negative Poisson's ratio metamaterial structure is buried in the slope surface where the road surface on both sides connects with the abutment, the first negative Poisson's ratio metamaterial structure is formed by a plurality of negative Poisson's ratio unit cell structures arranged periodically, the first negative Poisson's ratio metamaterial structure is buried in the slope surface where the road surface on both sides connects with the abutment, the cross-section of the negative Poisson's ratio unit cell structure is a hollow inner hexagon, the negative Poisson's ratio unit cell structure is composed of reinforced soil, and the inner cavity of the negative Poisson's ratio unit cell structure is filled with soil layer; The negative Poisson's ratio metamaterial structure also includes a second negative Poisson's ratio metamaterial structure, which includes a plurality of rod-shaped cell bodies, a transition area is provided between the rigid abutment and the roadbed surface, the plurality of rod-shaped cell bodies are evenly arranged in the inner cavity of the transition area, and the upper and lower ends of the negative Poisson's ratio metamaterial structure are respectively against the upper and lower inner walls of the inner cavity of the transition area; The rod-shaped cell body is composed of an upper support plate, a lower support plate, an internal elastic structure and an external structure, wherein the internal elastic structure is spliced ​​inside the external structure, and the upper and lower ends of the internal elastic structure and the external structure are respectively connected to the upper support plate and the lower support plate; The external structure is composed of a plurality of rods, which are arranged in a circle with the central axis of the upper support plate and the lower support plate as the axis, the two sides of the rods are convex outward, and the middle of the rods are arc-shaped and concave toward the internal elastic structure.

2. The device for treating bridge head bounce based on negative Poisson's ratio hexagonal reinforced soil according to claim 1 is characterized by: Adjacent negative Poisson's ratio unit cell structures are connected by geotechnical reinforcement bars.

3. The device for treating bridge head bounce based on negative Poisson's ratio hexagonal reinforced soil according to claim 1 or 2, characterized in that: The outer cross section and the inner cross section of the negative Poisson's ratio unit cell structure are both inner hexagons.

4. The device for treating a vehicle bounce at a bridge head based on negative Poisson's ratio hexagonal reinforced soil according to claim 3 is characterized by: A reinforced steel mesh structure with ribs is laid above the first negative Poisson's ratio metamaterial structure. The steel mesh structure is composed of a plurality of transverse steel bars and longitudinal steel bars interlaced with each other. The longitudinal steel bars in the steel mesh extend outward toward the end of the bridge head, and the extended ends of the longitudinal steel bars are bent toward the abutment, penetrate into the abutment, and are tied and welded to the steel bars in the abutment.

5. The device for treating bridge head bounce based on negative Poisson's ratio hexagonal reinforced soil according to claim 4 is characterized by: The internal elastic structure includes an upper spring sleeve, a lower spring sleeve and an elastic member. The top of the upper spring sleeve is fixed to the lower end of the upper support plate, and the bottom of the lower spring sleeve is fixed to the upper end of the lower support plate. The lower spring sleeve is sleeved in the upper spring sleeve. The inner walls of the upper spring sleeve and the lower spring sleeve form a telescopic space. The elastic member is installed in the telescopic space, and the upper spring sleeve can slide up and down along the lower spring sleeve.

6. The device for treating bridge head bounce based on negative Poisson's ratio hexagonal reinforced soil according to claim 5 is characterized by: An upper spring seat is arranged in the inner cavity of the upper spring sleeve, the inner side wall of the upper spring sleeve has at least one strip guide groove, the outer wall of the lower spring sleeve has a guide block, the guide block is sleeved in the strip guide groove and can move along the strip guide groove, a lower spring seat is arranged in the inner cavity of the lower spring sleeve, and two ends of the elastic member are respectively fixed on the upper spring seat and the lower spring seat.

7. The device for treating bridge head bounce based on negative Poisson's ratio hexagonal reinforced soil according to claim 1 is characterized by: The plurality of second negative Poisson's ratio metamaterial structures are arranged and distributed in a single row and multiple columns or multiple rows and multiple columns in the transition region.

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