Lightweight guardrail stand column with directionally adjustable rigidity and construction method thereof

Abstract

The invention discloses a lightweight guardrail stand column with directionally adjustable rigidity and a construction method thereof, and relates to the technical field of highway guardrails. Comprising a stand column body, limiting blocks, guiding pieces and rib plates, the stand column body is a steel pipe, the guiding pieces are of an annular structure and surround the inner wall of the stand column body by a circle, the multiple guiding pieces are fixed to the inner wall of the stand column body in parallel from top to bottom at intervals, and sliding grooves are formed in the guiding pieces; the rib plate is arranged in the stand column body, limiting blocks are arranged at the bottom and the top of the rib plate, the bottom and the top of the rib plate make contact with the side vertical face of the guiding piece, the rib plate is fixed through the limiting blocks and the guiding piece, and a rectangular hole is formed in the rib plate. The rigidity of the target position of the stand column can be adjusted according to the actual situation, the using amount of structural materials of the non-key position is reduced, the purpose of light weight of the stand column is achieved, and meanwhile the long-term using cost of the guardrail structure in the operation and maintenance period is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway guardrails, and more specifically, relates to a lightweight guardrail post with directionally adjustable stiffness and a construction method thereof. Background Art

[0002] During highway operations, guardrails are often installed along high-risk road sections to minimize the consequences of accidents involving vehicles running off the road and maximize the safety of vehicles and passengers. Highway guardrails are constructed of posts and beams. Currently, posts in highway guardrails are typically constructed of round or square tubes. These posts have a fixed cross-sectional size and require on-site driving during construction. Later in operation and maintenance, these structures are typically dismantled and replaced with new guardrail posts.

[0003] Chinese patent 202021775405.X discloses an adjustable guardrail, including a handrail rod, a connecting rod, a guardrail rod structure and a support rod structure; the support rod structure includes a ground support rod, a spiral rod and a rotating block, and a connecting rod is provided between the two ground support rods. The ground support rod and the handrail rod are both hollow, and a through hole is provided on the lower surface of the handrail rod. A spiral channel block is provided at the upper end of the ground support rod, one end of the spiral rod is screwed into the spiral channel block, and the other end of the spiral rod passes through the through hole of the handrail rod and is connected to the rotating block. The rotating block is arranged inside the handrail rod, and the thickness of the rotating block is equal to the hollow thickness of the handrail rod. The guardrail rod structure includes a lower guardrail rod and an upper guardrail rod; the user can adjust the guardrail up and down according to his or her own height requirements for the guardrail, and there is no need to replace the guardrail due to height issues, which saves cost and manpower, increases the user experience, and increases the safety of the guardrail.

[0004] Chinese patent 202222580782.3 discloses an adjustable road warning guardrail, including a support frame, fixed tubes are fixedly installed on both sides of the support frame, a support plate is fixedly installed on the bottom surface of the fixed tube, and an adjustment component is arranged inside the fixed tube for adjusting the height of the road warning guardrail, the adjustment component includes: a movable plate, the movable plate is movably sleeved inside the support plate, a first limiting hole is opened on one side of the support plate, an L-shaped plate is fixedly installed on one side of the support plate, a U-shaped plate is fixedly installed on one side of the inner side of the L-shaped plate, and the inner circular wall surface of the first limiting hole is movably sleeved on the limiting column. Through the mutual cooperation of the support frame, the movable plate, the connecting plate, the support plate and the fixed tube, the transportation space occupied by the road warning guardrail is reduced, and the number of transportation times is reduced when transporting road warning guardrails in large quantities.

[0005] When designing a guardrail structure based on existing technology, the size of the column needs to be determined based on an actual vehicle collision test. During the test, due to the bending moment generated by the collision load, the column will usually bend at a certain position on the ground or below. This position is subject to greater force and requires greater structural rigidity, and the column wall thickness is also increased accordingly. At other positions of the column, the structural dimensions are the same as the bending position, but the degree of play is smaller than that of the bending position, resulting in low material utilization. This problem can be solved by adopting a variable cross-section design, that is, the structural wall thickness can be increased at a fixed position to achieve an increase in the stiffness of the target position, but this method can only increase the stiffness of the fixed position of the column. If the bending position of the column changes due to reasons such as road paving, the position of the stiffness increase cannot be adjusted.

[0006] As road traffic conditions change, the proportion of large vehicles increases, and the protection objectives of guardrails change, guardrail upgrades and modifications are often necessary. Because the column structure is fixed in size, the original column stiffness cannot meet the requirements and cannot be used anymore. Replacing the column with a stiffer one increases the cost of the guardrail structure. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a lightweight guardrail post with directionally adjustable stiffness and a construction method thereof, which can adjust the stiffness of the target position of the post according to actual conditions, reduce the amount of structural materials used in non-critical positions, achieve the purpose of lightweighting the post, and at the same time reduce the long-term use cost of the guardrail structure during operation and maintenance.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a lightweight guardrail post with directionally adjustable stiffness, comprising a post body, a limit block, a guide piece, and a rib plate. The post body is a hollow steel pipe structure, the guide piece is an annular structure, and several guide pieces are parallel and fixedly connected to the inner wall of the post body from top to bottom, each guide piece is arranged around a circle along the inner wall of the post body, and the side facade of the guide piece is provided with a slide groove, the limit block is clamped and connected to the slide groove and slides horizontally along the slide groove, the rib plate is uprightly arranged inside the post body, a limit block is provided on the bottom surface of the rib plate, and a limit block is provided on the top surface of the rib plate. The bottom side facade of the rib plate is in contact with the side facade of the guide piece, and the top side facade of the rib plate is in contact with the side facade of the guide piece. The limit block and the guide piece fix the rib plate, and the rib plate is provided with a rectangular hole.

[0009] Preferably, the top and bottom surfaces of the limit block are symmetrically provided with protrusions to form a horizontally placed T-shaped structure, and the protrusions are engaged in the sliding groove and slide horizontally along the sliding groove.

[0010] Preferably, the top surface of the limit block is provided with a slot with an upward opening, and the bottom end of the rib is snapped into the slot.

[0011] Preferably, a positioning piece is provided above the rib plate, and a clamping portion is provided on the bottom surface of the positioning piece. The clamping portion is clamped in the clamping groove to limit the limit block horizontally, and the four sides of the positioning piece are attached to the four inner vertical surfaces of the guide piece.

[0012] Preferably, a bolt hole is provided on the side surface of the limit block, and the bolt passes through the limit block and is screwed to the guide member.

[0013] Preferably, the rib is an integrated structure composed of a single or multiple X-direction steel plates, a single or multiple Y-direction steel plates, or a single or multiple X-direction steel plates welded with a single or multiple Y-direction steel plates, and both sides of the X-direction steel plate and both sides of the Y-direction steel plate are in contact with the side elevation of the guide member.

[0014] Preferably, a clamping piece is fixedly connected to the side of the limiting block by means of bolts, and a positioning groove is provided at the bottom of the clamping piece. The positioning groove is clamped on the end of the rib plate to limit the rib plate.

[0015] A lightweight guardrail post with directionally adjustable stiffness and a construction method thereof, comprising the following steps:

[0016] S1. Weld the column body and the guide piece together and insert the limit block into the guide piece's slide groove.

[0017] S3. Determine the height of the rib plate within the column body according to actual conditions, slide the limit block at the bottom of the rib plate to an appropriate position, and securely connect the limit block at the bottom to the guide member at the bottom with bolts;

[0018] S4. Place the rib plate upright in the column body, with the bottom end of the rib plate placed on the bottom limit block;

[0019] S5. Move the limit block on the top of the rib plate to the top of the rib plate, and use bolts to fix the limit block on the top to the top guide piece. At this time, the rib plate structure consists of the X-direction steel plate and the Y-direction steel plate, and the column installation is completed;

[0020] S6. In step S5, when the rib plate has only X-direction steel plates or only Y-direction steel plates, clamp the clamping piece at the top of the rib plate, and fix the clamping piece to the limit block with bolts, and the column installation is completed;

[0021] S7. In step S5, when the top limit block and the top guide member are not connected by bolts, the positioning member is placed on the top limit block, and the clamping portion of the positioning member is clamped with the clamping groove on the top limit block, thereby limiting the top limit block and completing the installation of the column.

[0022] The beneficial effects of adopting the above technical solution are:

[0023] 1. The present invention provides a plurality of guide members and a plurality of limit blocks inside the guardrail column, and provides holes on the rib plate. The rib plate can be fixed at different height positions of the column by the limit blocks and the guide members according to actual conditions, thereby locally strengthening the column. The directional dynamic adjustment of the column stiffness can be achieved by changing the thickness of the rib plate, the height of the rib plate, the size of the holes on the rib plate and the height of the rib plate in the column, thereby solving the problem that the guardrail column cannot be used anymore due to the fixed size during upgrading and reconstruction, and reducing the long-term use cost of the guardrail structure during operation and maintenance.

[0024] 2. The present invention strengthens the local stiffness of the guardrail column through guide parts, limit blocks and ribs, which can increase the local stiffness of the column at positions where the stress and deformation are large and easy to bend, and reduce the structural thickness at positions where the stress and deformation are small, avoiding the increase of the column stiffness along the entire length of the column, reducing the overall material consumption and weight of the guardrail structure, and improving the material utilization rate while reinforcing the key positions, thereby realizing the weight reduction and lightweight design of the column. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial cross-sectional front view schematic diagram of the column in Example 1;

[0026] Figure 2 This is a schematic diagram of a structural form of the rib plate in Example 1;

[0027] Figure 3 This is another schematic diagram of the structure of the rib in Example 1;

[0028] Figure 4 is a bottom view schematic diagram of the positioning member in Example 1;

[0029] Figure 5 3. It is a three-view drawing of the limit block in the first embodiment;

[0030] Figure 6 It is a partial cross-sectional front view of the column in the second embodiment;

[0031] Figure 7 3. It is a three-view drawing of the limit block in the second embodiment;

[0032] Figure 8 This is a schematic diagram of the installation status of the column;

[0033] Figure 9 It is a schematic diagram of the main structure of the card connector;

[0034] In the figure: 1. column body; 2. limit block; 21. protrusion; 22. slot; 3. guide member; 31. slide groove; 4. rib; 41. hole; 5. positioning member; 51. clamping part; 52. handle; 6. bolt; 7. clamping member; 71. positioning slot; 8. ground. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Example 1

[0037] like Figure 1 As shown, in order to more clearly show the connection structure between the limit block 2 and the rib plate 4, the steel plate in the other direction is not drawn. The lightweight stiffness directionally adjustable guardrail column includes a column body 1, a limit block 2, a guide 3, and a rib plate 4. The column body 1 is a square rectangular tube. Figures 2-3 As shown, the guide member 3 is annular and arranged along the inner wall of the column body 1. Several guide members 3 are fixedly attached to the inner wall of the column body 1 in parallel and at intervals from top to bottom. The side elevations of the guide members 3 are provided with C-shaped slots 31. The side elevations of the limit block 2 are fixedly connected to the clamping member 7 via bolts. The positioning slot 71 below the clamping member 7 precisely engages the top of the rib plate 4, limiting the position of the rib plate 4.

[0038] like Figure 5 As shown, the top surface of the stopper 2 is provided with a slot 22. The bottom end of the rib 4 is engaged in the slot 22, and the top end rests on the bottom surface of the stopper 2, which is flat. Protrusions 21 are symmetrically provided on the top and bottom surfaces of the stopper 2. Protrusions 21 engage in slots 31 and slide horizontally along these slots.

[0039] The ribs 4 are installed upright inside the column body 1. The ribs 4 in this embodiment can be a single or multiple X-direction steel plates, a single or multiple Y-direction steel plates, or an integrated structure formed by welding a single or multiple X-direction steel plates with a single or multiple Y-direction steel plates. The top of each steel plate is pressed by two limit blocks 2, and the bottom is supported by two limit blocks 2. The ribs 4 are limited in the vertical direction by the limit blocks 2 at the top and bottom. When the ribs 4 are an integrated structure of X-direction and Y-direction steel plates, the ribs 4 are limited in the horizontal direction by the guide members 3 at the top and bottom. When the ribs 4 have only X-direction steel plates or only Y-direction steel plates, it is necessary to install the clamping members 7 to limit the top of the ribs 4.

[0040] In order to prevent the limit block 2 on the top of the rib 4 from shifting during use, a positioning member 5 is placed above the top limit block 2. The four sides of the positioning member 5 are just attached to the four side elevations of the guide member 3, and the guide member 3 limits the positioning member 5 in the horizontal direction. A clamping portion 51 is provided on the bottom surface of the positioning member 5. The size of the clamping portion 51 is just stuck in the card slot 22, so that the limit block 2 on the top of the rib 4 is horizontally limited by the positioning member 5, and the number and arrangement of the clamping portions 51 are designed according to the number and arrangement of the ribs 4. It should be noted that in order to maintain the stability of the positioning member 5, according to the principle of three points determining one surface, there are at least three clamping portions 51. As shown in FIG. Figure 2 and Figure 3 As shown in FIG, there are two structural arrangements of the ribs 4. Figure 4 The positioning member 5 is Figure 3 The ribs 4 in the center are compatible. To facilitate installation and removal, a handle 52 can be provided on the positioning member 5. When the ribs 4 have only X-direction steel plates or only Y-direction steel plates, the limit blocks 2 at the bottom of the ribs 4 need to be secured with bolts 6. Regardless of the structural form of the ribs 4, the top limit blocks 2 can be secured with bolts 6 instead of the positioning members 5.

[0041] The size of the holes 41 on the ribs 4, as well as the height and thickness of the ribs, are determined based on simulation technology and tests. At the construction site, the columns are laid out according to their spacing, and the columns are driven into the roadbed soil according to the laid-out positions. The specific height position of the ribs 4 in the column body 1 is determined based on structural calculations and tests. The bottom limit block 4 is then slid along the slide 31 to the corresponding position. If the ribs 4 only have X-axis steel plates or only Y-axis steel plates, the bottom limit block 4 needs to be fixed with bolts 6, and then the bottom end of the ribs 4 is clamped into the clamping groove 22 of the bottom limit block 2. Finally, the top limit block 2 is moved to the top of the ribs 4 to block the ribs 4. Finally, the clamping portion 51 on the bottom surface of the positioning member 5 is clamped into the clamping groove 22 of the top limit block 2, so that the top limit block 2 will not shift. The top limit block 2 can also be fixed with bolts 6. The top and bottom limit blocks 2 limit the vertical position of the ribs 4. If the ribs 4 are X- or Y-oriented steel plates, the tops of the ribs 4 are clamped with the clamping members 7. This achieves localized stiffness reinforcement of the column. Later, the height of the ribs 4 within the column body 1 can be adjusted as needed to achieve localized stiffness reinforcement. If necessary, the stiffness of the ribs 4 can be adjusted by changing the size of the holes 41 and by varying the thickness and height of the ribs 4, thereby achieving directional dynamic adjustment of the column stiffness.

[0042] Example 2

[0043] The difference between this embodiment and the first embodiment is the structure of the limit block 2 and the structure of the rib 4. Figure 6As shown, in order to more clearly illustrate the connection structure between the limit block 2 and the rib plate 4, the steel plate in the other direction is not drawn. The slot 22 is removed from the top surface of the limit block 2 to form a T-shaped structure. The upper and lower ends of the rib plate 4 are directly pressed against the plane of the upper and lower limit blocks 2. In this embodiment, there is no longer a need for a positioning member 5 to limit the horizontal direction of the top limit block 2. Each limit block 2 is fixedly connected to the guide member 3 by a bolt 6 to achieve horizontal limitation. The rib plate 4 is limited in the vertical direction by the top and bottom limit blocks 2. The rib plate 4 in this embodiment cannot be just a single or multiple X-direction steel plates, nor can it be just a single or multiple Y-direction steel plates. It must be a cross structure formed by welding the X-direction steel plates and the Y-direction steel plates. It can also be a well structure. There can be two or more X-direction steel plates, and there can be two or more Y-direction steel plates. The number of X-direction steel plates and Y-direction steel plates is determined according to actual needs. Because the four sides of the ribs 4 rest against the four side elevations of the guide members 3, the ribs 4 do not move or rotate horizontally within the column body 1. To install the ribs 4 in this embodiment, first slide the bottom stoppers 2 corresponding to the X- and Y-axis steel plates into place and secure them with bolts 6. Then, lower the ribs 4 into the column body 1 from top to bottom, and slide the corresponding top stoppers 2 into place and secure them with bolts 6. Installation is very convenient.

[0044] Example 3

[0045] In this embodiment, Figure 7 As shown, the structure of the limit block 2 is identical to that of Example 2. Compared to Example 2, the limit block 2 only has two additional threaded holes, which are used to connect to the clamping member 7. The center hole of the limit block 2 is used to connect to the guide member 3, thereby securing the limit block 2. In this embodiment, the rib 4 consists of only X-axis steel plates or only Y-axis steel plates. The clamping members 7 are installed on the limit blocks 2 at both the top and bottom of the rib 4. The clamping members 7 and the guide member 3 together limit the horizontal movement of the rib 4, while the limit block 2 limits the vertical movement of the rib 4, thereby enhancing the local stiffness of the column.

[0046] The construction method of the column of the present invention comprises the following steps:

[0047] S1. Weld the column body 1 and the guide member 3 together, and insert the limit block 2 into the slide groove 31 of the guide member 3;

[0048] S3. Determine the height of the rib plate 4 within the column body 1 according to actual conditions, slide the limit block 2 at the bottom of the rib plate 4 to a suitable position, and securely connect the limit block 2 at the bottom to the guide member 3 at the bottom with bolts;

[0049] S4. Place the rib plate 4 upright in the column body 1, with the bottom end of the rib plate 4 placed on the bottom limit block 2;

[0050] S5. Move the limit block 2 on the top of the rib plate 4 to the top of the rib plate 4 and fix the limit block 2 on the top of the guide member 3 with bolts. At this time, the structure of the rib plate 4 is composed of the X-direction steel plate and the Y-direction steel plate, and the column installation is completed;

[0051] S6. In step S5, when the rib plate 4 has only X-direction steel plates or only Y-direction steel plates, clamp the clamping member 7 at the top of the rib plate 4 and fix the clamping member 7 to the limit block 2 with bolts. The column installation is completed.

[0052] S7. In step S5, when the top limit block 2 and the top guide member 3 are not connected by bolts, the positioning member 5 is placed on the top limit block 2, and the clamping portion 51 of the positioning member 5 is clamped with the clamping groove 22 on the top limit block 2, thereby limiting the top limit block 2, and the column installation is completed.

[0053] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A lightweight, stiff and directionally adjustable guardrail post, characterized in that: The utility model comprises a column body (1), a limit block (2), a guide member (3), and a rib plate (4); the column body (1) is a hollow steel pipe structure; the guide member (3) is a ring structure; a plurality of guide members (3) are parallel and fixedly connected to the inner wall of the column body (1) from top to bottom; each guide member (3) is arranged along the inner wall of the column body (1); a slide groove (31) is provided on the side surface of the guide member (3); the limit block (2) is connected to the slide groove (31) and is arranged along the slide groove. (31) horizontal sliding movement, the rib plate (4) is vertically arranged inside the column body (1), a limit block (2) is provided on the bottom surface of the rib plate (4), a limit block (2) is provided on the top surface of the rib plate (4), the bottom side surface of the rib plate (4) is in contact with the side surface of the guide member (3), the top side surface of the rib plate (4) is in contact with the side surface of the guide member (3), the limit block (2) and the guide member (3) fix the rib plate (4), and a rectangular hole (41) is provided on the rib plate (4).

2. A lightweight, stiffness-adjustable guardrail post according to claim 1, characterized in that: The top and bottom surfaces of the limit block (2) are symmetrically provided with protrusions (21) to form a horizontally placed T-shaped structure. The protrusions (21) are engaged in the slide groove (31) and slide horizontally along the slide groove (31).

3. A lightweight, stiffness-adjustable guardrail post according to claim 2, characterized in that: The top surface of the limit block (2) is provided with a clamping groove (22) with an opening facing upward, and the bottom end of the rib plate (4) is clamped in the clamping groove (22).

4. A lightweight, stiffness-adjustable guardrail post according to claim 3, characterized in that: A positioning member (5) is also provided above the rib plate (4), and a clamping portion (51) is provided on the bottom surface of the positioning member (5). The clamping portion (51) is clamped in the clamping groove (22) to limit the position of the limit block (2) in the horizontal direction, and the four side elevations of the positioning member (5) are attached to the four side elevations of the guide member (3).

5. A lightweight guardrail post with adjustable directional stiffness according to any one of claims 1 to 4, characterized in that: A bolt hole is provided on the side surface of the limiting block (2); the bolt (6) passes through the limiting block (2) and is screwed to the guide member (3).

6. The lightweight, stiffness-adjustable guardrail post according to claim 3, characterized in that: The rib plate (4) is an integrated structure formed by welding a single or multiple X-direction steel plates, a single or multiple Y-direction steel plates, or a single or multiple X-direction steel plates and a single or multiple Y-direction steel plates, and both sides of the X-direction steel plates and both sides of the Y-direction steel plates are in contact with the side elevation of the guide member (3).

7. A lightweight, directionally adjustable guardrail post according to any one of claims 1 to 3, characterized in that: A clamping member (7) is fixedly connected to the side of the limiting block (2) by means of bolts. A positioning groove (71) is provided at the bottom of the clamping member (7). The positioning groove (71) is clamped to the end of the rib plate (4) to limit the rib plate (4).

8. A construction method for realizing a lightweight, directionally adjustable guardrail column as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Weld the column body (1) and the guide member (3) together, and insert the limit block (2) into the slide groove (31) of the guide member (3); S3. Determine the height of the rib plate (4) within the column body (1) according to actual conditions, slide the limit block (2) at the bottom of the rib plate (4) to a suitable position, and securely connect the limit block (2) at the bottom to the guide member (3) at the bottom with bolts; S4. Place the rib plate (4) upright in the column body (1), with the bottom end of the rib plate (4) placed on the limit block (2) at the bottom; S5. Move the limit block (2) on the top of the rib plate (4) to the top of the rib plate (4), and use bolts to fix the limit block (2) on the top to the guide member (3) on the top. At this time, the structure of the rib plate (4) is composed of the X-direction steel plate and the Y-direction steel plate, and the local rigidity of the column is strengthened; S6. In step S5, when the rib plate (4) has only X-direction steel plates or only Y-direction steel plates, the clamping member (7) is clamped at the top of the rib plate (4), and the clamping member (7) is fixedly connected to the limit block (2) with bolts, thereby completing the local stiffness reinforcement of the column; S7. In step S5, when the top limit block (2) and the top guide member (3) are not connected by bolts, the positioning member (5) is placed on the top limit block (2), and the clamping portion (51) of the positioning member (5) is clamped with the clamping groove (22) on the top limit block (2), thereby limiting the top limit block (2) and strengthening the local rigidity of the column.

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