A highway, a corrugated beam guardrail installation structure and method for a cutting section

Abstract

The present application discloses a highway, a corrugated beam guardrail installation structure and method for an excavation section, the structure comprising an excavation section, and an excavation ditch and an excavation slope arranged outside the excavation section; a curved portion is arranged at a position of the excavation ditch near the upstream end of the corrugated beam guardrail; the curved portion comprises a parallel section and an underpass section connected to each other; after the corrugated beam guardrail is extended outward and crosses the underpass section, the upstream end of the corrugated beam guardrail is inserted into the excavation slope, and the columns of the corrugated beam guardrail are located on both sides of the underpass section. The highway comprises the above-mentioned outward-extending corrugated beam guardrail installation structure and the corrugated beam guardrail. The method comprises sequentially setting the positions of the corrugated beam guardrail and the excavation ditch, and constructing the excavation ditch and the corrugated beam guardrail. The present application solves the problems in the prior art that it is not convenient to set an outward-extending upstream end of the corrugated beam guardrail in the excavation section, and that the protection effect is poor when an energy-absorbing upstream end is set, thereby achieving the purpose of effective vehicle protection.

Description

Technical Field

[0001] This application belongs to the technical field of highway engineering design and construction, and specifically relates to a highway, a corrugated beam guardrail installation structure and method for cutting sections. Background Art

[0002] In the design of highway engineering safety facilities, according to the requirements of the "Code for Design of Highway Traffic Safety Facilities" (JTG / T D81-2017), it is necessary to set guardrails according to the roadside obstacle conditions, and further require that the starting and ending points of the roadside corrugated beam guardrails should be treated at the ends. The upstream end in the driving direction should preferably be set as an outwardly extended round head type, an outwardly extended embedded type or an energy-absorbing type.

[0003] As Figure 1 shown, when the corrugated beam guardrail 2 is set on the filled section 9, the corrugated beam guardrail 2 adopts an outwardly extended upstream end 21 (the outwardly extended upstream end includes an outwardly extended round head type and an outwardly extended embedded type). The corrugated beam guardrail 2 includes a standard section and a transition section connected in sequence. The end of the transition section away from the standard section is the upstream end 21, and the upstream end 21 is inserted into the filled slope 10. The transition section is an arc-shaped structure. According to the design speed, a certain gradient rate is selected for the transition section, and it is feasible to transition the upstream end 21 of the corrugated beam guardrail 2 from the standard section to the outside of the earthen shoulder, which meets the requirements of the above design rules.

[0004] As Figure 2 shown, when the corrugated beam guardrail 2 is set on the cutting section 1, since the subgrade of the cutting section 1, that is, the outside of the earthen shoulder, is adjacent to the cutting side ditch 3, the columns of the transition section of the corrugated beam guardrail 2 fall into the position of the cutting side ditch 3, and then there is no installation position for the columns of the transition section of the corrugated beam guardrail 2, resulting in the upstream end 21 being unable to smoothly transition from the standard section to the outside of the earthen shoulder. Therefore, the scheme of transitioning the upstream end 21 of the corrugated beam guardrail 2 from the standard section to the outside of the earthen shoulder cannot be implemented.

[0005] According to the "Code for Design of Highway Traffic Safety Facilities" (JTG / T D81-2017), in sections where the outwardly extended upstream end cannot be adopted, the corrugated beam guardrail adopts an energy-absorbing upstream end, and the guardrail does not require transition. However, the energy-absorbing upstream end has the following disadvantages:

[0006] First, since the energy-absorbing upstream end is not outwardly extended and the corrugated beam plates are not inserted into the cutting slope soil body, it does not form an overall block and protection for vehicles. In the event of a traffic accident, it is easy for vehicles to rush out of the road. If it happens to be at the filling and cutting junction, or immediately after the cutting section is a bridge, the severity of the vehicle running out of the road accident is extremely high; extending the guardrail a certain distance into the cutting section can solve the problem of the vehicle running out of the road, but due to the extended guardrail, its investment cost is also increasing continuously, and there is no clear specification for the setting length, so safety cannot be ensured.

[0007] Second, the construction cost of the energy-absorbing upstream terminal is 7 to 8 times that of the upstream outward-extending terminal, which is relatively expensive.

[0008] Third, the energy-absorbing upstream end absorbs the energy of vehicle collision through its own deformation, thereby achieving the purpose of reducing accident damage. However, the deformation of the energy-absorbing upstream end is irreversible. After a traffic accident, the upstream end fails and is a disposable product. The energy-absorbing upstream end must be replaced in time after an accident, and its maintenance cost is much higher than that of the outward-type corrugated beam upstream end. Summary of the invention

[0009] The embodiments of the present application provide a structure and method for installing a corrugated beam guardrail on a highway or an excavated section, thereby solving the problems in the prior art that it is inconvenient to set an outward-facing upstream end of the corrugated beam guardrail in an excavated section, and that the protection effect is poor when an energy-absorbing upstream end is set, thereby achieving the purpose of effective vehicle protection.

[0010] The embodiment of the present invention provides a corrugated beam guardrail installation structure for an excavated road section, comprising an excavated road section, and an excavated side ditch and an excavated side slope sequentially arranged outside the excavated road section;

[0011] The excavation side ditch is provided with a curved portion at a position close to the upstream end of the corrugated beam guardrail;

[0012] The curved portion is curved toward the direction of the excavation slope; the curved portion includes a parallel section and an underpass section connected to each other, and the underpass section is arranged close to the upstream end of the corrugated beam guardrail;

[0013] After the corrugated beam guardrail is extended outward and crosses the underpass section, the upstream end of the corrugated beam guardrail is inserted into the excavation slope, and the columns of the corrugated beam guardrail are located on both sides of the underpass section.

[0014] Furthermore, a reinforced concrete foundation is provided between the starting point and the end point of the curved portion and on one side close to the excavation section.

[0015] A highway comprises the above-mentioned outward-extending corrugated beam guardrail installation structure and a corrugated beam guardrail.

[0016] Further, the corrugated beam guardrail comprises a standard section, a first transition section and a second transition section which are connected in sequence;

[0017] The standard section is parallel to the extension direction of the excavation section;

[0018] The first transition section has a set outward gradient; the end of the second transition section away from the first transition section is the upstream end.

[0019] Further, the connection between the first transition section and the second transition section is located between the cut slope ditch and the cut slope.

[0020] Further, the included angle between the first transition section and the second transition section is in the range of 0° to 20°.

[0021] Further, the first transition section is arranged in parallel with the parallel section.

[0022] An installation method for an outspread corrugated beam guardrail in a cut section includes the following steps:

[0023] Set the installation position of the corrugated beam guardrail: Set the starting point of the first transition section;

[0024] Denote the column near the connection between the first transition section and the second transition section of the first transition section as the last column, and the distance L from the last column to the inner edge of the shoulder 0 =W 1 +W 2 +W 3 , where W 1 is the width of the shoulder, W 2 is the width of the cut slope ditch, and W 3 is the width of the side wall of the cut slope ditch;

[0025] The theoretical length L of the first transition section 1 =L 0 ÷v, where v is the outspread gradient of the first transition section;

[0026] Round up the value of L 1 ÷M, where M is the spacing of the columns of the corrugated beam guardrail; and denote the rounded-up value of L 1 ÷M as L 2 ;

[0027] Then the actual length L of the first transition section 3 =L 2 ·M;

[0028] Set the installation position of the first transition section according to the starting point of the first transition section, the outspread gradient v of the first transition section, and the actual length L3 of the first transition section;

[0029] Set the installation positions of the second transition section and the upstream end according to the included angle between the first transition section and the second transition section;

[0030] Set the position of the cut slope ditch: Set the starting point of the parallel section, where the parallel section is arranged in parallel with the first transition section, and the connection line between the starting point of the parallel section and the starting point of the first transition section is perpendicular to the extension direction of the cut section;

[0031] The underpass section passes under the first transition section, and the last column and the column immediately preceding the last column of the first transition section are respectively located on both sides of the underpass section;

[0032] Both ends of the underpass section are transitioned with arcs having a radius of r;

[0033] Construct the cut-off ditch according to the position of the cut-off ditch;

[0034] Construct the corrugated beam guardrail according to the installation position of the corrugated beam guardrail.

[0035] Further, both ends of the underpass section have a radius r in the range of 2.2 m to 3.8 m.

[0036] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0037] The embodiments of the present invention provide a highway, a corrugated beam guardrail installation structure and method for a cut section. In this installation structure, the setting of the bent portion of the cut-off ditch can increase the angle between the corrugated beam guardrail and the underpass section it crosses. Furthermore, the columns of the corrugated beam guardrail can be arranged on both sides of the underpass section without affecting the service performance of the columns of the corrugated beam guardrail, realizing the structural setting of the outspread upstream end. This avoids the problem in the prior art that there is no installation position for the columns in the transition section of the corrugated beam guardrail, which leads to the inability to smoothly transition the upstream end from the standard section to the outside of the earthen shoulder. The installation method is easy to implement and has low cost. The highway can meet the requirements of the Design Rules for Traffic Safety Facilities, ensuring the safety of drivers and passengers, and at the same time greatly reducing the maintenance cost. It also avoids the problems of high cost and low safety existing in the use of energy-absorbing upstream ends in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a schematic structural diagram of an outspread upstream end in a filled section in the prior art.

[0040] Figure 2 It is a schematic structural diagram of an outspread upstream end in a cut section in the prior art.

[0041] Figure 3 It is a schematic diagram of the corrugated beam guardrail installation structure for a cut section provided by the embodiments of the present invention.

[0042] Figure 4 The flowchart of the installation method of the corrugated beam guardrail for the cutting section provided by the embodiment of the present invention.

[0043] Reference numerals: 1 - cutting section; 2 - corrugated beam guardrail; 21 - upstream end; 22 - standard section; 23 - first transition section; 24 - second transition section; 3 - cutting side ditch; 31 - parallel section; 32 - underpass section; 4 - cutting slope; 5 - reinforced concrete foundation; 6 - last column; 7 - inner edge of the earthen shoulder; 8 - side wall of the cutting side ditch; 9 - filling section; 10 - filling slope. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] As Figure 3 shown, a corrugated beam guardrail installation structure for a cutting section provided by an embodiment of the present invention is characterized in that: it includes a cutting section 1, and a cutting side ditch 3 and a cutting slope 4 sequentially arranged outside the cutting section 1.

[0046] A bending part is provided at a position of the cutting side ditch 3 close to the upstream end 21 of the corrugated beam guardrail 2; the structural form of the provided bending part is based on not affecting the normal drainage of the cutting side ditch 3.

[0047] The bending part is bent towards the cutting slope 4; the bending part includes a connected parallel section 31 and an underpass section 32, and the underpass section 32 is arranged close to the upstream end 21 of the corrugated beam guardrail 2.

[0048] The bending part is bent towards the cutting slope 4, so it will not affect the normal driving of vehicles in the cutting section 1; the structural form of the bending part is simple and easy to construct, so the construction cost of this installation structure is relatively low.

[0049] After the corrugated beam guardrail 2 extends outward and crosses the underpass section 32, the upstream end 21 of the corrugated beam guardrail 2 is inserted into the cutting slope 4, and the columns of the corrugated beam guardrail 2 are located on both sides of the underpass section 32.

[0050] The setting of the bending part can increase the included angle between the corrugated beam guardrail 2 and the underpass section 32 it spans. As a result, the columns of the corrugated beam guardrail 2 can be arranged on both sides of the underpass section 32, without affecting the service performance of the columns of the corrugated beam guardrail 2, and avoiding the problem in the prior art that there is no installation position for the columns in the transition section of the corrugated beam guardrail, which leads to the upstream end 21 being unable to smoothly transition from the standard section to the outside of the earthen shoulder.

[0051] By changing the relative position between the columns of the corrugated beam guardrail 2 and the cut slope ditch 3, the present invention enables the setting of the cut slope ditch 3 not to affect the columns of the corrugated beam guardrail 2, that is, it meets the requirements of the Design Rules for Highway Traffic Safety Facilities, and realizes the structural setting of the outspread upstream end. Therefore, it can better ensure the safety of drivers and passengers, and at the same time greatly reduce the maintenance cost.

[0052] In this embodiment, a reinforced concrete foundation 5 is set on the side close to the cut section 1 between the starting point and the ending point of the bending part, that is, at the position of the original cut slope ditch 3, and the columns of the corrugated beam guardrail 2 are fixedly connected to the steel bars of the reinforced concrete foundation 5. Setting the reinforced concrete foundation 5 can ensure the structural strength at this position, enabling the columns of the corrugated beam guardrail 2 to play the set protective role.

[0053] As Figure 3 shown, a highway includes the outspread corrugated beam guardrail installation structure as described above, and the corrugated beam guardrail 2.

[0054] The corrugated beam guardrail 2 adopting the above-mentioned outspread corrugated beam guardrail installation structure can meet the requirements of the Design Rules for Highway Traffic Safety Facilities, ensure the safety of drivers and passengers, and avoid the problems of high cost and low safety existing in the use of energy-absorbing upstream ends in the prior art.

[0055] In this embodiment, the corrugated beam guardrail 2 includes a standard section 22, a first transition section 23, and a second transition section 24 connected in sequence;

[0056] The standard section 22 is parallel to the extension direction of the cut section 1; the standard section 22 is also the normal protective part of the corrugated beam guardrail 2.

[0057] The first transition section 23 has a set outspread gradient; the end of the second transition section 24 far from the first transition section 23 is the upstream end 21.

[0058] The outspread gradient of the first transition section 23 is selected according to the Design Rules for Highway Traffic Safety Facilities. The upstream end 21 is inserted into the cut slope 4, enabling the corrugated beam guardrail 2 to transition from the standard section to the outside of the earthen shoulder, so as to form the structure of the outspread corrugated beam guardrail, and further achieve the purpose of protecting the driving vehicles.

[0059] The connection point between the first transition section 23 and the second transition section 24 of this embodiment is located between the cut-off side ditch 3 and the cut-off slope 4. Thus, a structure for transitioning between the two transition sections is formed. The two transition sections can ensure the set protective effect of the corrugated beam guardrail 2 when the installation length of the corrugated beam guardrail 2 is limited. Figure 3 In the two transition sections for transition, when the installation length of the corrugated beam guardrail 2 is limited, the set protective effect of the corrugated beam guardrail 2 can be ensured.

[0060] The included angle between the first transition section 23 and the second transition section 24 of this embodiment is within the range of 0° to 20°. During actual construction, the included angle between the first transition section 23 and the second transition section 24 is preferably close to 0° to achieve a better protective effect. When the included angle between the first transition section 23 and the second transition section 24 exceeds 20°, the protective effect will be greatly reduced.

[0061] In this embodiment, the first transition section 23 is arranged in parallel with the parallel section 31, which can prevent the installation position of the columns of the corrugated beam guardrail 2 from being within the set area of the cut-off side ditch 3, minimize the drainage impact on the cut-off side ditch 3, and also minimize the engineering quantity. Furthermore, it ensures the use safety of the road and reduces the construction cost.

[0062] As Figures 3 to 4 shown, an installation method for an outward-expanded corrugated beam guardrail for a cut-off section includes the following steps:

[0063] Set the installation position of the corrugated beam guardrail 2: Set the starting point of the first transition section 23;

[0064] Record the column closest to the connection point between the first transition section 23 and the second transition section 24 in the first transition section 23 as the last column 6. The distance L from the last column 6 to the inner edge 7 of the earthen shoulder 0 =W 1 +W 2 +W 3 , where W 1 is the width of the earthen shoulder, W 2 is the width of the cut-off side ditch 3, and W 3 is the width of the side wall 8 of the cut-off side ditch. Setting the last column 6 close to the side wall 8 of the cut-off side ditch can ensure the installation space for the columns of the corrugated beam guardrail 2 and avoid the problem of setting the last column 6 far from the side wall 8 of the cut-off side ditch, which would lead to the need to set the parallel section 31 of the cut-off side ditch for a longer distance.

[0065] The theoretical length L of the first transition section 23 1 =L 0 ÷v, where v is the outward expansion gradient of the first transition section 23; the outward expansion gradient is also the slope of the first transition section 23.

[0066] Round up the value of L 1 ÷M, where M is the spacing between the columns of the corrugated beam guardrail 2; and take L 1The value obtained by rounding up the division by M is denoted as L 2 .

[0067] Then the actual length L of the first transition section 23 3 = L 2 ·M; By rounding up, the actual length of the first transition section 23 can be made an integer, which is convenient for the specific construction of the corrugated beam guardrail 2 and also convenient for the staff to calculate the protection strength of the corrugated beam guardrail 2

[0068] Set the installation position of the first transition section 23 according to the starting point of the first transition section 23, the outward expansion gradient v of the first transition section 23 and the actual length L3 of the first transition section 23; Through the starting point of the first transition section 23, the outward expansion gradient v of the first transition section 23 and the actual length L3 of the first transition section 23, the specific structural form and installation position of the first transition section 23 can be determined

[0069] Set the installation positions of the second transition section 24 and the upstream end 21 according to the included angle between the first transition section 23 and the second transition section 24; After the specific structural form of the first transition section 23 is determined, the structural form and installation position of the entire corrugated beam guardrail 2 can be determined through the included angle between the first transition section 23 and the second transition section 24

[0070] Set the position of the cut slope side ditch 3: Set the starting point of the parallel section 31. The parallel section 31 is parallel to the first transition section 23. Among them, the connection line between the starting point of the parallel section 31 and the starting point of the first transition section 23 is perpendicular to the extension direction of the cut slope section 1; That is, the first transition section 23 and the parallel section 31 are both outwardly expanded

[0071] The underpass section 32 passes under the first transition section 23, and the last column 6 and the column before the last column 6 of the first transition section 23 are respectively located on both sides of the underpass section 32

[0072] Both ends of the underpass section 32 are transitioned with arcs of radius r; Using arc transition can make the drainage effect of the cut slope side ditch 3 better

[0073] After the structural form and installation position of the corrugated beam guardrail 2 are determined, the structural form and installation position of the bending part of the cut slope side ditch 3 can be determined through the underpass position of the underpass section 32 and the transition method of the underpass section 32

[0074] Construct the cut slope side ditch 3 according to the position of the cut slope side ditch 3; After the construction of the cut slope side ditch 3, the construction of the reinforced concrete foundation 5 can be carried out

[0075] Construct the corrugated beam guardrail 2 according to the installation position of the corrugated beam guardrail 2. Thus, the installation of the corrugated beam guardrail 2 is completed

[0076] In this embodiment, the two ends of the underpass section 32 adopt a radius r in the range of 2.2 m to 3.8 m. The range of 2.2 m to 3.8 m can ensure the normal installation of the columns of the corrugated beam guardrail 2 and ensure the normal drainage of the cutting side ditch 3.

[0077] The above is only a preferred embodiment of the present invention, and does not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A corrugated beam guardrail installation structure for excavated road sections. Features: It comprises an excavation road section (1), and an excavation ditch (3) and an excavation slope (4) which are sequentially arranged outside the excavation road section (1); The excavation ditch (3) is provided with a curved portion at a position close to the upstream end (21) of the corrugated beam guardrail (2); The corrugated beam guardrail (2) comprises a standard section (22), a first transition section (23) and a second transition section (24) which are connected in sequence; the standard section (22) is parallel to the extension direction of the excavation section (1); the first transition section (23) presents a set outward gradient; the end of the second transition section (24) away from the first transition section (23) is the upstream end (21); the angle between the first transition section (23) and the second transition section (24) is in the range of 0° to 20°; The curved portion is arranged to bend in the direction of the excavation slope (4); the curved portion comprises a parallel section (31) and a downward-penetrating section (32) connected to each other, and the downward-penetrating section (32) is arranged close to the upstream end (21) of the corrugated beam guardrail (2); After the corrugated beam guardrail (2) is extended outward and crosses the underpass section (32), the upstream end (21) of the corrugated beam guardrail (2) is inserted into the excavation slope (4), and the columns of the corrugated beam guardrail (2) are located on both sides of the underpass section (32); The connection point between the first transition section (23) and the second transition section (24) is located between the excavation ditch (3) and the excavation slope (4); The first transition section (23) is arranged in parallel with the parallel section (31).

2. The corrugated beam guardrail installation structure for excavated road sections according to claim 1, Features: A reinforced concrete foundation (5) is provided between the starting point and the end point of the curved portion and on one side close to the excavated road section (1).

3. A highway, It is characterized in that It comprises a corrugated beam guardrail installation structure for an excavated road section as claimed in claim 1 or 2, and a corrugated beam guardrail (2).

4. A method for installing the corrugated beam guardrail installation structure for a road section under excavation as claimed in claim 1 or 2, It is characterized in that The following steps are involved: Setting the installation position of the corrugated beam guardrail (2): setting the starting point of the first transition section (23); Denote the column near the connection of the first transition section (23) and the second transition section (24) of the first transition section (23) as the last column (6), and the distance L from the last column (6) to the inner edge (7) of the earthen shoulder 0 =W 1 +W 2 +W 3 , where W 1 is the width of the earthen shoulder, W 2 is the width of the cut side ditch (3), and W 3 is the width of the side wall (8) of the cut side ditch; The theoretical length L of the first transition section (23) 1 = L 0 ÷ v, where v is the outward gradient rate of the first transition section (23); Round up the value of L 1 divided by M, where M is the spacing between the columns of the corrugated beam guardrail (2); and record the value obtained by rounding up L 1 divided by M as L 2 ; Then the actual length L of the first transition section (23) 3 = L 2 ·M; Setting the installation position of the first transition section (23) according to the starting point of the first transition section (23), the outward gradient rate v of the first transition section (23) and the actual length L3 of the first transition section (23); The installation positions of the second transition section (24) and the upstream end head (21) are set according to the included angle between the first transition section (23) and the second transition section (24); Setting the position of the excavation ditch (3): Setting the starting point of the parallel section (31), wherein the parallel section (31) and the first transition section (23) are arranged in parallel, wherein the line connecting the starting point of the parallel section (31) and the starting point of the first transition section (23) is perpendicular to the extension direction of the excavation section (1); The underpass section (32) passes under the first transition section (23), and the last column (6) and the column before the last column (6) of the first transition section (23) are respectively located on both sides of the underpass section (32); Both ends of the underpass section (32) are transitioned by arcs with a radius of r; Construct the cut-off ditch (3) according to the position of the cut-off ditch (3); Construct the corrugated beam guardrail (2) according to the installation position of the corrugated beam guardrail (2).

5. The installation method according to claim 4, characterized in that: Both ends of the underpass section (32) have a radius r in the range of 2.2 m to 3.8 m.

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