A driving device for highway stainless steel guardrail post

Abstract

The application relates to a driving device for a highway stainless steel guardrail stand column, belonging to the technical field of installation of driving type steel stand columns of highway guardrails. The device comprises a column head, a vertical screw rod is screwed in the column head, an expansion plug is fixedly arranged at the lower end of the screw rod, the expansion plug is in an inverted circular table structure with the upper part being thick and the lower part being thin, four friction sheets are arranged around the expansion plug, the four friction sheets are located in the inner side of the upper end opening of the stand column, an action plate is fixedly arranged in the middle of the inner side arc surface of the friction sheet, a connecting rod is rotationally arranged at the middle of the upper end of each action plate, the upper end of the connecting rod is hinged to the column head, an action inclined surface is arranged at the upper end of the side edge away from the friction sheet of the action plate, and the action inclined surface on the action plate of the friction sheet and the outer side conical surface of the expansion plug are kept in close contact; the problems that the stand column of the current guardrail is prone to structural damage in the driving process are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of installation of driven steel columns for highway guardrails, and in particular relates to a driving device for highway stainless steel guardrail columns. Background Art

[0002] During the construction of driven steel columns for highway guardrails, a significant technical challenge lies in the direct impact of the pile driver on the upper end of the column. Particularly in hard geological conditions, this direct impact often results in the upper portion of the column taking on a "mushroom-shaped" shape after completion. This unusual shape not only severely hinders the precise installation of the subsequent column cap or upper column section, but also allows impurities such as rain, snow, and dust to easily enter the column, thereby weakening its internal corrosion resistance. Over time, this can compromise the stability and durability of the entire guardrail system.

[0003] With the continuous advancement of the steel industry, high-strength steel is becoming a new favorite in traffic safety facilities due to its excellent mechanical properties and economic efficiency. To optimize construction costs and reduce resource consumption, the wall thickness of columns is being designed to be lightweight, minimizing the thickness while still meeting operational requirements. However, this design trend also presents new challenges: while the strength of high-strength steel has been significantly increased, its Young's modulus (the material's ability to resist elastic deformation) has not been significantly improved accordingly. As a result, lightweight columns are more susceptible to localized stability failure during driving, especially when subjected to high-intensity hammer blows, where their ability to resist deformation is relatively weak.

[0004] During the construction of driven steel columns for highway guardrails, the columns undergo repeated high-intensity hammering, a process that severely tests the material and weld quality. Specifically, repeated hammering forces significantly increase the risk of cracking in the weld area. As the critical link connecting the various components of the column, the integrity of the weld is directly related to the stability and safety of the entire guardrail structure. Failure to promptly replace or repair cracked welds or damaged materials will directly reduce the overall protection level of the guardrail.

[0005] Given these issues, implementing effective protection measures for the upper portion of driven steel guardrail posts during the installation process is crucial. This is not only to prevent "mushroom head" cracking or material cracking, but also to ensure the structural integrity of the posts during installation and operation, thereby guaranteeing the long-term stability of the entire guardrail system. Therefore, developing an efficient and reliable construction protection solution for driven steel guardrail posts has become a critical technical challenge urgently needed in the field of traffic safety engineering. Summary of the Invention

[0006] The present invention overcomes the shortcomings of the prior art and provides a driving device for highway stainless steel guardrail posts, thereby solving the problem that the current guardrail posts are easily structurally damaged during the driving process.

[0007] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0008] A driving device for highway stainless steel guardrail posts, including a post, a vertical screw rod screwed inside the post, and an expansion plug fixedly arranged at the lower end of the screw rod. The expansion plug is an inverted truncated cone structure that is thick at the top and thin at the bottom. Four friction plates are arranged around the expansion plug, and the four friction plates are located on the inner side of the upper end opening of the post. An action plate is fixedly arranged in the middle of the inner arc surface of the friction plate. A connecting rod is rotatably arranged in the middle of the upper end of each action plate. The upper end of the connecting rod is hinged to the post, and an action inclined surface is provided on the upper end of the edge of the action plate away from the friction plate. The action inclined surface on the action plate of the friction plate is kept in contact with the outer conical surface of the expansion plug.

[0009] Furthermore, the column head is a vertically arranged variable diameter cylindrical structure, including a small diameter section on the upper side and a large diameter section on the lower side. An upper side action groove is provided at the center of the upper end surface of the small diameter section, and a lower side action groove is provided at the center of the lower end surface of the large diameter section. A partition is provided between the upper side action groove and the lower side action groove, and an internal threaded hole passing through the upper and lower sides is provided at the center of the partition; the screw rod is screwed into the inside of the internal threaded hole; the upper end of the connecting rod is hinged to the inner top surface of the lower side action groove.

[0010] Furthermore, a hexagonal hole is provided on the upper end surface of the screw rod.

[0011] Furthermore, the upper end opening of the column is sleeved into the lower side action groove of the column head.

[0012] Furthermore, the friction plate is an arc-shaped plate structure, the axis of the friction plate is vertically arranged, and the outer arc surface of the friction plate contacts the inner side surface of the upper end opening of the column.

[0013] Furthermore, the action plate is a vertically arranged square plate structure, the action plate is perpendicular to the inner arc surface of the friction plate, and the axis of the screw rod is located in the plane where the action plate is located.

[0014] Furthermore, the inclination of the effective inclined surface on the effective plate of the friction plate is consistent with the inclination of the outer conical surface of the expansion plug.

[0015] Furthermore, two symmetrical semi-cylindrical hoops are provided on the outer side of the upper end opening of the column, and both hoops are in contact with the outer side surface of the column; two sets of upper and lower bolt holes are provided on the side wall of the column, and two upper and lower bolt holes are also provided on each hoop. The fixing bolts pass through the bolt holes on the two hoops and the bolt holes on the column in turn and are screwed with fixing nuts, thereby fixing the two hoops to the outer side of the column.

[0016] Furthermore, a semicircular reinforcement ring is fixedly provided on the outer side surface of the hoop near the upper end, and a half circle of square clamping blocks are equidistantly provided on the upper end surface of the reinforcement ring.

[0017] Furthermore, a circle of square clamping grooves is provided at the lower end opening of the lower side action groove of the column head; the upper end openings of the two spliced ​​hoops are inserted into the lower end opening of the lower side action groove of the column head, the upper end face of the reinforcing ring on the outer side of the hoop contacts the lower end face of the column head, and the clamping blocks on the hoop are respectively clamped into a circle of clamping grooves inside the lower side action groove of the column head.

[0018] The beneficial effects of the present invention compared to the prior art are:

[0019] 1. Compared with directly hammering the column with a pile driver, the driving device for highway stainless steel guardrail columns provided by the present invention can effectively prevent the upper end surface of the column from forming a "mushroom head" shape after construction, ensure the smooth installation of the column cap and the upper column, and alleviate the anti-corrosion problem inside the column.

[0020] 2. For high-strength steel columns, a driving device with an external hoop and internal support structure is used for construction. It can convert the vertical hammer force acting on the upper end face of the column into a vertical friction force along the side wall of the column, improve the local stability of the column during the driving process, and ensure the smooth installation of the column under complex geological conditions.

[0021] 3. The driving device with an outer hoop and inner support structure is used to provide support force and hoop effect, thereby reducing the deformation of the column head during the driving process and avoiding the cracking of the material or weld of the column under repeated hammering. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below with reference to the accompanying drawings:

[0023] Figure 1 It is a three-dimensional schematic diagram of the present invention as a whole;

[0024] Figure 2 It is a front view of the present invention as a whole;

[0025] Figure 3 It is a cross-sectional view of the front of the present invention;

[0026] Figure 4 It is a partial schematic diagram after cutting of the present invention;

[0027] Figure 5 It is a three-dimensional representation of the capital Figure 1 ;

[0028] Figure 6 It is a three-dimensional representation of the capital Figure 2 ;

[0029] Figure 7 It is a schematic diagram of the connection between the expansion plug and the four friction plates;

[0030] Figure 8 It is a schematic diagram of the connection between the expansion plug and a friction plate;

[0031] Figure 9 It is a three-dimensional schematic diagram of the friction plate;

[0032] Figure 10 It is a three-dimensional schematic diagram of the hoop;

[0033] Among them, 1 is the column head, 2 is the small diameter section, 3 is the large diameter section, 4 is the upper side action groove, 5 is the lower side action groove, 6 is the internal threaded hole, 7 is the column, 8 is the screw rod, 9 is the hexagonal hole, 10 is the expansion plug, 11 is the friction plate, 12 is the action plate, 13 is the action inclined surface, 14 is the connecting rod, 15 is the hoop, 16 is the fixing bolt, 17 is the fixing nut, 18 is the reinforcement ring, 19 is the clamping block, and 20 is the clamping groove. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0035] like Figure 1 As shown in FIG. 10 , the present invention provides a driving device for a stainless steel guardrail column of a highway, comprising a column head 1, a friction plate 11, an expansion plug 10, a screw rod 8, and a reinforcement ring 18.

[0036] The column head 1 is a vertically arranged cylindrical structure with a variable diameter, including a small diameter section 2 on the upper side and a large diameter section 3 on the lower side. An upper side action groove 4 is provided at the center of the upper end surface of the small diameter section 2, and a lower side action groove 5 is provided at the center of the lower end surface of the large diameter section 3. A partition is provided between the upper side action groove 4 and the lower side action groove 5, and an internal threaded hole 6 is provided at the center of the partition that passes through the upper and lower sides.

[0037] The upper end opening of the column 7 is sleeved into the lower side action groove 5 of the column head 1.

[0038] A vertical screw rod 8 is screwed into the internal threaded hole 6 of the partition of the column head 1. A hexagonal hole 9 is provided at the upper end surface of the screw rod 8. A plug 10 is fixedly provided at the lower end of the screw rod 8. The plug 10 is an inverted truncated cone structure with a thicker top and a thinner bottom. The plug 10 is coaxial with the screw rod 8.

[0039] Four friction plates 11 are arranged around the expansion plug 10 in a circular array around the axis of the screw 8. These plates 11 are located inside the upper opening of the column 7. These plates 11 are arc-shaped plates with their axes oriented vertically. Their outer arc surfaces contact the inner side of the upper opening of the column 7. A vertically mounted action plate 12 is fixed to the center of the inner arc surface of the friction plate 11. This action plate 12 is a square plate-like structure, perpendicular to the inner arc surface of the friction plate 11. The axis of the screw 8 lies within the plane of the action plate 12. An action bevel 13 is located at the upper edge of the action plate 12, facing away from the friction plate 11. The slope of the action bevel 13 matches the slope of the outer conical surface of the expansion plug 10. The action bevel 13 on the action plate 12 of the friction plate 11 maintains contact with the outer conical surface of the expansion plug 10.

[0040] The outer arc surfaces of all friction plates 11 are knurled to increase the friction between the friction plates 11 and the upper end opening of the pillar 7 .

[0041] A connecting rod 14 is rotatably provided at the middle of the upper end of each action plate 12 , the lower end of the connecting rod 14 is hinged to the action plate 12 , and the upper end of the connecting rod 14 is hinged to the inner top surface of the lower action groove 5 of the column head 1 .

[0042] Two symmetrical semi-cylindrical hoops 15 are provided on the outer side of the upper opening of the column 7. Both hoops 15 fit closely to the outer side of the column 7. Two sets of bolt holes are provided on the sidewall of the column 7, and each hoop 15 also has two bolt holes. Fixing bolts 16 pass through the bolt holes of the two hoops 15 and the bolt holes of the column 7 in sequence, and are then screwed onto fixing nuts 17, thereby securing the two hoops 15 to the outer side of the column 7.

[0043] A semicircular reinforcement ring 18 is fixedly provided near the upper end of the outer side of the hoop 15, and a half circle of square clamping blocks 19 are equidistantly provided on the upper end face of the reinforcement ring 18. Vertical and horizontal reinforcement strips are fixedly provided on the outer side of the hoop 15.

[0044] A circle of square clamping grooves 20 is provided at the lower end opening of the lower side action groove 5 of the column head 1.

[0045] The upper end openings of the two spliced ​​hoops 15 are inserted into the lower end opening of the lower side action groove 5 of the column head 1, the upper end surface of the reinforcement ring 18 on the outside of the hoop 15 contacts the lower end surface of the column head 1, and the clamping blocks 19 on the hoop 15 are respectively clamped into a circle of clamping grooves 20 inside the lower side action groove 5 of the column head 1.

[0046] The working principle of the present invention is:

[0047] When it is necessary to drive the column 7 into the ground at the installation location, first fix the two hoops 15 to the outside of the column 7 by fixing bolts 16 and fixing nuts 17, then place the column head 1 with the screw rod 8, expansion plug 10, and friction plate 11 on the upper end of the column 7, so that the friction plate 11 and expansion plug 10 are placed inside the upper end opening of the column 7, so that the upper end face of the reinforcement ring 18 on the outside of the hoop 15 contacts the lower end face of the column head 1, and the clamping blocks 19 on the hoop 15 are respectively clamped into the inside of a circle of clamping grooves 20 of the lower side action groove 5 of the column head 1.

[0048] Then, the screw rod 8 is gradually screwed in, causing it to gradually enter the lower working groove 5. The screw rod 8 drives the expansion plug 10 to gradually descend. The outer conical surface of the expansion plug 10 interacts with the working inclined surfaces 13 of the working plates 12 of the four friction plates 11, causing the four friction plates 11 to gradually expand outward along the radial direction of the screw rod 8. The outer arc surfaces of the four friction plates 11 are in close contact with the inner wall of the upper end opening of the column 7. The four friction plates 11 press against the inner wall of the upper end opening of the column 7. At this time, the upper end of the screw rod 8 enters the upper working groove 4 of the column head 1.

[0049] Then, the pile driving equipment hammers the upper end of the column head 1. Since the screw rod 8 is screwed to the column head 1, the column head 1 drives the expansion plug 10 downward through the screw rod 8, and the expansion plug 10 drives the four friction plates 11 downward. Since the four friction plates 11 are completely pressed against the inner wall of the upper end opening of the column 7, the four friction plates 11 drive the column 7 downward. Under the action of the column head 1, the column 7 is gradually hammered into the ground, thus completing the installation of the column 7.

[0050] During the construction process, the strong vertical impact force that originally acted directly on the upper end surface of the column 7 was innovatively converted into a vertical friction force along the surface of the column 7. This conversion effectively improved the stability and controllability of the driving process.

[0051] The internal expansion mechanism, a key technology of the present invention, is ingeniously designed to automatically increase its expansion effect as the pillar 7 is driven deeper. This feature ensures that sufficient friction is continuously provided during the driving process, effectively preventing the pillar 7 from slipping or loosening, and ensuring the reliability of the construction quality.

[0052] The core function of the semicircular hoops 15 on both sides is to enhance the vertical friction between the driving device and the column 7, and effectively curb the deformation of the column in the radial direction, thereby preventing the occurrence of adverse situations such as the "mushroom head" phenomenon or weld cracking.

[0053] More importantly, the combined internal expansion and external hoop structure not only strengthens the overall rigidity of column 7 but also significantly improves its resistance to deformation during the driving process. This innovative design effectively avoids local deformation and material or weld cracking that may occur in column 7 under complex construction conditions, ensuring the overall stability and safety of the highway guardrail.

[0054] Horizontal and vertical reinforcement bars are arranged on the outside of the hoop 15. Their primary purpose is to optimize the hoop's flexural section modulus and enhance its resistance to bending deformation. Furthermore, these bars are strategically positioned with bolt holes at their intersections, effectively distributing the axial tension applied by the bolts and ensuring balanced stress across the structure.

[0055] A reinforcement strip is also installed on the outside of the hoop 15, its primary function being to stably support the hammering force transmitted by the impacted stud 1. The reinforcement ring above the bolt hole allows for convenient bolt connection, and its flat surface provides a stable support surface for the installation of the fixing bolts. Notably, the spacing between the two bolt holes precisely matches the existing bolt hole spacing on the column 7. This detailed design not only simplifies the installation process and avoids the tediousness of secondary drilling, but also effectively protects the integrity of the column structure and prevents structural damage caused by additional processing.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A driving device for stainless steel guardrail posts on highways, characterized by: The invention comprises a column head (1), a vertical screw rod (8) is screwed inside the column head (1), an expansion plug (10) is fixedly provided at the lower end of the screw rod (8), the expansion plug (10) is a structure of an inverted truncated cone with a thick upper part and a thin lower part, four friction plates (11) are provided around the expansion plug (10), the four friction plates (11) are located inside the upper end opening of the column (7), the friction plates (11) are circular arc plate structures, and the inner arc of the friction plates (11) is provided. An action plate (12) is fixedly provided in the middle of the surface, a connecting rod (14) is rotatably provided in the middle of the upper end of each action plate (12), the upper end of the connecting rod (14) is hinged to the column head (1), and an action inclined surface (13) is provided on the upper end of the edge of the action plate (12) away from the friction plate (11), and the action inclined surface (13) on the action plate (12) of the friction plate (11) is kept in contact with the outer conical surface of the expansion plug (10); The column head (1) is a vertically arranged cylindrical structure with a variable diameter, comprising an upper small diameter section (2) and a lower large diameter section (3); an upper action groove (4) is provided at the center of the upper end surface of the small diameter section (2); a lower action groove (5) is provided at the center of the lower end surface of the large diameter section (3); a partition is provided between the upper action groove (4) and the lower action groove (5); a vertically penetrating internal threaded hole (6) is provided at the center of the partition; a screw rod (8) is screwed into the inner threaded hole (6); and the upper end of the connecting rod (14) is hinged to the inner top surface of the lower action groove (5); The upper end opening of the column (7) is sleeved into the lower side action groove (5) of the column head (1); Two symmetrical semi-cylindrical hoops (15) are provided on the outer side of the upper end opening of the column (7), and the two hoops (15) are both fitted with the outer side surface of the column (7); two sets of upper and lower bolt holes are provided on the side wall of the column (7), and two upper and lower bolt holes are also provided on each hoop (15). The fixing bolts (16) pass through the bolt holes on the two hoops (15) and the bolt holes on the column (7) in sequence and are then screwed with fixing nuts (17), thereby fixing the two hoops (15) to the outer side of the column (7); A semicircular reinforcing ring (18) is fixedly provided on the outer side surface of the hoop (15) near the upper end thereof, and a semicircular square clamping block (19) is provided on the upper end surface of the reinforcing ring (18) at equal intervals. A circle of square clamping grooves (20) is provided at the lower end opening of the lower side action groove (5) of the column head (1); the upper end openings of the two spliced ​​hoops (15) are inserted into the lower end opening of the lower side action groove (5) of the column head (1), the upper end surface of the reinforcement ring (18) on the outer side of the hoop (15) contacts the lower end surface of the column head (1), and the clamping blocks (19) on the hoop (15) are respectively clamped into the inner part of a circle of clamping grooves (20) of the lower side action groove (5) of the column head (1).

2. The driving device for a stainless steel highway guardrail post according to claim 1, characterized in that: A hexagonal hole (9) is provided at the upper end surface of the screw rod (8).

3. The driving device for a stainless steel guardrail post for a highway according to claim 1, characterized in that: The axis of the friction plate (11) is arranged vertically, and the outer arc surface of the friction plate (11) contacts the inner side surface of the upper end opening of the column (7).

4. The driving device for a stainless steel highway guardrail post according to claim 1, characterized in that: The action plate (12) is a vertically arranged square plate-shaped structure. The action plate (12) is perpendicular to the inner arc surface of the friction plate (11), and the axis of the screw rod (8) is located in the plane where the action plate (12) is located.

5. The driving device for a stainless steel highway guardrail post according to claim 1, characterized in that: The inclination of the action inclined surface (13) on the action plate (12) of the friction plate (11) is consistent with the inclination of the outer conical surface of the expansion plug (10).

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