Guardrail structure for highway bridge tunnel portal

Abstract

The utility model discloses an expressway bridge tunnel portal guardrail structure which comprises a first-type guardrail, a second-type guardrail and a third-type guardrail which are sequentially connected, and the first-type guardrail, the second-type guardrail and the third-type guardrail are all formed by pouring concrete. The first-type guardrail is located at the end away from the tunnel portal and fixedly connected with the bridge guardrail, and the connecting point of the first-type guardrail and the second-type guardrail does not exceed the bridge guardrail. The second-type guardrail is located on the abutment transition slab section of the bridge, the two ends of the second-type guardrail are connected with the first-type guardrail and the third-type guardrail respectively, and the bottom of the second-type guardrail is connected with the bridge floor in a steel bar planting mode. The three-type guardrail is connected with a tunnel portal, and the bottom of the three-type guardrail is connected with a bridge floor through stand columns which extend into the lower portion of the bridge floor. According to the guardrail structure, the structural characteristics of the bridge tunnel portal are combined, the three sections of concrete guardrails in three different installation modes are adopted, the protection grade is met, the stability and durability of the guardrail structure can be guaranteed, and meanwhile the building cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of highway bridge tunnel mouth protection, specifically relates to a highway bridge tunnel mouth guardrail structure. BACKGROUND

[0002] In the design of highway subgrade and bridge, emergency lane is usually designed, and tunnel usually does not design emergency lane. Therefore, when the vehicle drives into the tunnel from the bridge in the driving direction, there is a safety risk that the vehicle hits the tunnel portal, therefore, in order to improve the driving safety during the operation of the highway, the anti-collision guardrail needs to be arranged at the tunnel mouth.

[0003] A tunnel mouth guardrail transition section is disclosed in CN203361060U, and the protection guardrail is formed by the way that three-section wave-shaped guardrail plates and the concrete guardrail of the tunnel mouth are connected in sequence, but due to the fact that the steel guardrail is exposed in the natural environment for a long time, with the influence of time and external factors (such as the wear of the coating caused by the sand and stone raised by the vehicle), its durability is poor compared with the concrete structure. And once the steel guardrail is damaged, the maintenance cost is also high. And for the bridge-tunnel connecting section of the highway, SA-grade and above concrete guardrails should be adopted to ensure the road traffic safety.

[0004] Therefore, a highway bridge tunnel mouth guardrail structure with high stability and durability is needed. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the utility model provides a highway bridge tunnel mouth guardrail structure, which combines the structural characteristics of the bridge tunnel mouth, adopts a three-section concrete structure to realize the safety protection of the bridge tunnel mouth, meets the protection grade, ensures the stability and durability, and effectively reduces the construction cost.

[0006] Specifically, the utility model is realized as follows:

[0007] A highway bridge tunnel mouth guardrail structure, comprising: a type guardrail, a type guardrail and a type guardrail connected in sequence, the type guardrail, the type guardrail and the type guardrail are all poured by concrete;

[0008] The type guardrail is located at one end away from the tunnel mouth, and is fixedly connected with the bridge guardrail; the connecting point of the type guardrail and the type guardrail does not exceed the bridge guardrail;

[0009] The type guardrail is located at the abutment deck section of the bridge, and the two ends thereof are connected with the type guardrail and the type guardrail respectively, and the bottom of the type guardrail is connected with the bridge deck in the form of embedded steel bar;

[0010] The type guardrail is connected with the tunnel mouth, and the bottom thereof is connected with the bridge deck through a stand column, and the stand column extends into the bridge deck.

[0011] Further, the second type of guardrail is connected to the base layer of the bridge deck by steel bars.

[0012] Further, the column extends downward through the base layer of the bridge deck.

[0013] Further, each of the columns is 1.2 m long, and the distance between two adjacent columns is 1 m.

[0014] Further, grooves are provided on the surface layer of the bridge deck, and the first type of guardrail, the second type of guardrail and the third type of guardrail are arranged in the grooves.

[0015] Further, the first type of guardrail, the second type of guardrail and the third type of guardrail are internally provided with steel reinforcement frameworks.

[0016] Further, each of the first type of guardrail, the second type of guardrail and the third type of guardrail is provided with a reflective strip.

[0017] Working principle of the utility model:

[0018] The guardrail structure is a three-section structure, the first type of guardrail is used as a guide section, and the position of the first type of guardrail overlaps with the bridge guardrail on the outer side, this section only plays a guiding transition role, and the protection function is provided by the bridge guardrail. The second type of guardrail is installed on the abutment deck of the bridge in a way of drilling and planting steel bars, so that the strength of the second type of guardrail is ensured, and the second type of guardrail is not affected by the steel reinforcement framework in the abutment deck. The third type of guardrail is installed and fixed by a column, so that the strength of the third type of guardrail can be effectively enhanced, and the anti-collision level of the third type of guardrail can reach SA level.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] (1) The highway bridge tunnel entrance guardrail structure provided by the utility model adopts three-section concrete guardrails in three different installation modes according to the structural characteristics of the bridge tunnel entrance, so that the protection level is met, the stability and durability are ensured, and the construction cost is effectively reduced.

[0021] (2) The first type of guardrail overlaps with the bridge guardrail on the outer side, mainly plays a guiding role, and can reduce the construction process and construction difficulty without affecting the driving safety.

[0022] (3) The second type of guardrail is located on the abutment deck section of the bridge, and the strength of the structure of the second type of guardrail is ensured by drilling and planting steel bars, so that the protection ability of the second type of guardrail is ensured.

[0023] (4) The third type of guardrail extends from the abutment deck section of the bridge to the tunnel entrance, and is fixed with the bridge deck by a column, so that the anti-collision level of the third type of guardrail can reach SA level. DRAWINGS

[0024] Figure 1Structure diagram of the highway bridge tunnel portal guardrail structure in Example 1;

[0025] Figure 2 Exploded view of the highway bridge tunnel portal guardrail structure in Example 1;

[0026] Figure 3 Design diagram of the highway bridge tunnel portal guardrail structure in Example 1;

[0027] Figure 4 Vertical sectional view of the first type of guardrail in Example 1;

[0028] Figure 5 Vertical sectional view of the second type of guardrail in Example 1;

[0029] Figure 6 Vertical sectional view of the third type of guardrail in Example 1.

[0030] Reference signs:

[0031] 1 - tunnel; 2 - bridge guardrail; 3 - bridge deck; 31 - asphalt concrete surface layer; 32 - concrete base layer; 33 - cushion layer; 4 - first type of guardrail; 5 - second type of guardrail; 51 - reinforcing bar; 6 - third type of guardrail; 62 - upright column; 7 - reflective strip. DETAILED DESCRIPTION

[0032] The utility model will be further described in detail below through specific embodiments in combination with the drawings.

[0033] The bridge and the tunnel include an abutment plate, an abutment embedded plate, a short subgrade, and a tunnel portal transition section, wherein:

[0034] The abutment plate is a reinforced concrete plate and mainly plays a transition role, so that the vehicle can smoothly transition and reduce the phenomenon of jumping caused by structural differences during the process of driving from the bridge to the tunnel (or vice versa), thereby improving the driving comfort and safety.

[0035] The abutment embedded plate can tightly connect the bridge structure and the tunnel lining or other connecting sections, ensure the force transmission and cooperative work between the two, and guarantee the smoothness and continuity of the entire line.

[0036] The short subgrade is a structural system that smoothly connects the bridge and the tunnel, and can make the bridge and the tunnel realize natural transition in space, thereby guaranteeing the continuity and integrity of the line.

[0037] Example 1

[0038] As Figures 1-4As shown, the embodiment provides a highway bridge tunnel mouth guardrail structure, which is arranged at the bridge tunnel mouth to improve driving safety. Specifically, the guardrail structure comprises: a type 4 guardrail, a type 5 guardrail and a type 6 guardrail connected in sequence, a groove is arranged on the asphalt concrete surface layer 31 of the bridge deck 3, the type 4 guardrail, the type 5 guardrail and the type 6 guardrail are formed into a base structure with narrow top and wide bottom by pouring concrete on the reinforced framework, and all of them are poured into the groove of the asphalt concrete surface layer 31, thereby forming an integral whole with the bridge deck 3.

[0039] The guardrail structure is disconnected at the bridge abutment expansion joint, and the disconnected width is consistent with the width of the expansion joint, so as to avoid affecting the function of the bridge abutment expansion joint. Meanwhile, the guardrail structure is provided with a contraction joint every 5m (the joint is sawn along the outer side of the guardrail, and the joint depth is 3cm-5cm, which is used as the contraction joint of the guardrail itself, and an expansion joint is provided every 30m, and the width of the expansion joint is 2cm. In addition, a drainage hole with a size of 10x7.5cm is arranged every 5m at the bottom of the guardrail structure, so as to drain the accumulated water on the road.

[0040] The type 4 guardrail, the type 5 guardrail and the type 6 guardrail are all provided with a reflective strip 7, which reflects the light of the vehicle at night or in low visibility conditions to improve the visibility of the guardrail. The type 4 guardrail is located at one end away from the tunnel mouth, and the distal end thereof is fixedly connected with the bridge guardrail 2, and the type 4 guardrail overlaps with the bridge guardrail 2. Since the outer side of the type 4 guardrail has the bridge guardrail 2, the type 4 guardrail does not have strong anti-collision strength, and mainly plays a guiding role. In the case of not affecting driving safety, the type 4 guardrail can reduce the construction process and reduce the construction difficulty.

[0041] The type 5 guardrail is located at the bridge abutment slab section (about 1m-3m long) of the bridge, and the two ends thereof are connected with the type 4 guardrail and the type 6 guardrail respectively. Since the bridge abutment slab has a reinforced framework, a column structure cannot be used, and therefore the type 5 guardrail is connected by means of drilled hole and embedded steel bar, as shown in Figure 5 The same vertical section (width direction of the type 5 guardrail) is provided with two steel bars 51 embedded in the concrete base layer 32 of the bridge deck 3, so as to ensure the anti-collision level of the type 5 guardrail. The distance between the adjacent steel bars 51 in the length direction of the type 5 guardrail is 150mm.

[0042] As shown in Figure 6 The type 6 guardrail is connected with the tunnel mouth, and the bottom thereof is connected with the bridge deck 3 through a column 61. The length of a single column 61 is 1.2m, so that the column 61 can penetrate through the concrete base layer 32 of the bridge deck 3 and extend into the cushion layer 33. Meanwhile, the distance between the adjacent two columns 61 is 1m, so that the anti-collision level of the type 6 guardrail reaches SA level.

[0043] Specifically, taking the highway with a design speed of 80km / h as an example, the construction process of the guardrail structure is as follows:

[0044] The 10cm asphalt concrete surface layer of the bridge deck is chiseled to form a bridge deck groove, wherein the minimum length of the groove on the left side of the driving direction should be greater than or equal to 6.3m, and the minimum length of the groove on the right side of the driving direction should be greater than or equal to 34.3m, then the steel reinforcement framework of the first type of guardrail 4 is installed, and the first type of guardrail 4 concrete is poured.

[0045] The drill is used to drill holes in the bridge abutment slab segment, and the drilling depth is not less than the length of the steel bar 51 of the second type of guardrail 5. Then the steel bar 51 is inserted into the hole, and the hole is filled with the hole filling glue to complete the hole filling, then the steel reinforcement framework of the second type of guardrail 5 is installed, and the second type of guardrail 5 concrete is poured.

[0046] The drill is used to drill holes in the bridge abutment slab segment, and the drilling depth is not less than the length of the steel bar 51 of the second type of guardrail 5. Then the steel bar 51 is inserted into the hole, and the hole is filled with the hole filling glue to complete the hole filling, then the steel reinforcement framework of the second type of guardrail 5 is installed, and the second type of guardrail 5 concrete is poured.

[0047] The reflective strip 7 is installed on the guardrail after the assembly, and the construction is completed.

[0048] The cost of the above-mentioned guardrail is about 524 yuan / m, and the cost of the shaped steel guardrail on the market is about 2052 yuan / m, the price is only 1 / 4 of the steel guardrail, and the guardrail has high stability and durability, and can effectively reduce the cost of the guardrail.

[0049] The above application of specific examples is used to describe the present application, which is only used to help understand the present application, and does not limit the present application. For the skilled in the art to which the present application belongs, according to the idea of the present application, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A highway bridge tunnel portal barrier structure comprising: The one-type guardrail (4), the two-type guardrail (5) and the three-type guardrail (6) are connected in sequence, and are characterized in that the one-type guardrail (4), the two-type guardrail (5) and the three-type guardrail (6) are all made of concrete pouring; The one-type guardrail (4) is located at one end away from the tunnel portal, and is fixedly connected with the bridge guardrail (2); the connecting point of the one-type guardrail (4) and the two-type guardrail (5) is not more than the stop point of the bridge guardrail (2); The two-type guardrail (4) is located at the bridge abutment deck section, and is connected with the one-type guardrail (4) and the three-type guardrail (6) at two ends respectively, and the bottom of the two-type guardrail (5) is connected with the bridge deck (3) by the way of planting steel bars; The three-type guardrail (6) is connected with the tunnel portal, and the bottom thereof is connected with the bridge deck (3) through the stand column (61), and the stand column (61) extends into the bridge deck (3).

2. The highway bridge tunnel portal guardrail structure of claim 1, wherein, The two-type guardrail (5) is connected with the base layer of the bridge deck (3) through the steel bars (51).

3. The highway bridge tunnel portal guardrail structure of claim 1, wherein, The stand column (61) extends downward through the base layer of the bridge deck (3).

4. The highway bridge tunnel portal guardrail structure of claim 3, wherein, The length of the single stand column (61) is 1.2 m, and the distance between the adjacent two stand columns (61) is 1 m.

5. The highway bridge tunnel transition barrier structure of claim 1, wherein, The surface layer of the bridge deck (3) is provided with grooves, and the one-type guardrail (4), the two-type guardrail (5) and the three-type guardrail (6) are all arranged in the grooves.

6. The highway bridge tunnel outlet guardrail structure of claim 1, wherein, The one-type guardrail (4), the two-type guardrail (5) and the three-type guardrail (6) are all provided with steel reinforcement skeletons.

7. A highway bridge tunnel portal barrier structure according to any one of claims 1-6, characterized in that The one-type guardrail (4), the two-type guardrail (5) and the three-type guardrail (6) are all provided with reflective strips (7).

8. The highway bridge tunnel outlet guardrail structure of claim 1, wherein, The guardrail structure is disconnected at the bridge abutment expansion joint, and the disconnected width is consistent with the width of the bridge abutment expansion joint.

9. The highway bridge tunnel transition barrier structure of claim 8, wherein, The guardrail structure is provided with a contraction joint every 5 m, and is provided with an expansion joint every 30 m.

10. The highway bridge tunnel outlet guardrail structure of claim 1, wherein, The guardrail structure is provided with a water drain hole every 5 m, and the size of the water drain hole is 10*7.5 cm.

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