Bridge structure with dripping eave and construction method

Abstract

The invention discloses a bridge structure with a dripping eave and a construction method, solves the problem that in the prior art, the dripping eave on the back side of a guardrail is prone to falling off, and safety accidents are caused, and has the beneficial effects that concrete at the dripping eave can be vibrated compactly, so that the dripping eave is not prone to falling off. According to the specific scheme, the bridge structure with the dripping eave comprises a bridge body, the width of the bridge body is smaller than the design width of the bridge body when the bridge body is formed, a guardrail with the dripping eave is located on the end side of the bridge body, and the distance between the outer side face of the dripping eave and the forming side face of the bridge body is 2-7 cm larger than the diameter of a vibrating rod. The part, exceeding the forming side face, of the bridge body is connected with the guardrail and the dripping eave through a reinforcing mesh, the part, exceeding the forming side face, of the bridge body is integrally formed with the guardrail and the dripping eave in a pouring mode, and the back side of the guardrail adopts oblique lines of the same slope ratio so that a vibrating rod can enter the position between the dripping eave and the forming side face of the bridge body.

Description

Technical Field

[0001] The invention relates to the field of bridge structures, in particular to a bridge structure with a drip eave and a construction method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the elevated bridges usually have dripping eaves at the cantilever of the side plate. The dripping eaves are constructed as a whole with the guardrail of the bridge. The dripping eaves are wrapped around the beam and slab cantilever, and the construction joints are not exposed, which makes the overall appearance more beautiful. The dripping eaves of the guardrail can effectively prevent rainwater from flowing along the cantilever outside the beam and slab to the root of the cantilever, thereby improving the durability of the cantilever and ensuring that the bottom of the cantilever does not reduce the appearance due to rain marks. When the dripping eaves are not set, rainwater flows directly to the cantilever and directly impregnates the bottom of the cantilever and the web concrete. Even if a groove is set at the bottom of the cantilever, the groove cannot block all the water flow when the water volume is large, and some water still flows along the bottom of the cantilever to the web.

[0004] Because the drip eaves are small in size, the current problem with the drip eaves of the guardrail is that they are prone to falling off, damage, and other defects during operation (see Figure 1 As shown in the figure, the fallen drip eaves pose a threat to the safety of pedestrians and vehicles passing under the bridge. The reasons are as follows: first, the drip eaves are usually poured together with the guardrails during construction. After the concrete is poured, it is usually necessary to vibrate. Casting templates are set on both sides of the guardrails, and the vibrators are used for vibration. Specifically, the vibrators are lowered from the top to between the casting templates on both sides. However, since the back of the concrete guardrail is concave inward, the transverse width of the drip eaves on the outside of the precast beam slab is narrow, usually less than or equal to 10cm, and steel bars are arranged in the drip eaves (see Figure 2 As shown in the figure), it is difficult to lower the vibrating rod, which is the main reason for the loose compaction.

[0005] Moreover, the top width of the existing guardrail is relatively narrow, usually less than or equal to 20 cm, which makes it difficult to lower the vibrator to the dripping eaves; the back of the guardrail is provided with a fold line, which causes certain interference in the process of lowering the vibrator;

[0006] In addition, in order to make the drip eaves and the bridge flange plate better bonded, the design usually requires the ends of the bridge flange plate to be roughened before the drip eaves are constructed. However, in actual construction, due to the small working space and inconvenient construction, the roughening implementation is not ideal, resulting in poor bonding strength between the bridge flange plate and the drip eaves, making the drip eaves easy to fall off. Summary of the invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide a bridge structure with a drip eave, which can achieve compaction by vibration of the drip eave and avoid the occurrence of safety accidents caused by the drip eave falling off as much as possible.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A bridge structure with a drip eave comprises a bridge body, wherein the width of the bridge body when formed is smaller than the design width of the bridge body, a guardrail with a drip eave is located at the end side of the bridge body, the distance between the outer side surface of the drip eave and the formed side surface of the bridge body is 2cm-7cm larger than the diameter of a vibrating rod, a steel mesh is arranged in the connection between the portion of the bridge body extending beyond its formed side surface and the guardrail and the drip eave, the portion of the bridge body extending beyond its formed side surface is integrally cast together with the guardrail and the drip eave, and an oblique line with the same slope is adopted on the back side of the guardrail to facilitate the vibrating rod to enter between the drip eave and the formed side surface of the bridge body.

[0010] As described above, in a bridge structure with a drip eave, the width of the bridge body during molding is 12cm-18cm smaller than the designed width of the bridge body, and the width of the drip eave is 4cm-8cm, which reduces the amount of concrete while achieving vibration.

[0011] In the bridge structure with drip eaves as described above, the width of the top of the guardrail is 22cm-25cm, and the width of the bottom of the guardrail is 48cm-52cm.

[0012] In the bridge structure with dripping eaves as described above, the distance between the top of the back side of the guardrail and the outer side of the dripping eaves is 7-8 cm;

[0013] The slope of the back side of the guardrail is 15-17.1.

[0014] In a bridge structure with a drip eave as described above, the bottom surface of the drip eave is arranged to be inclined upward, and the bottom surface of the portion of the bridge body that exceeds its formed side surface is arranged in the same plane as the bottom surface of the drip eave.

[0015] A bridge structure with drip eaves as described above, wherein the bridge body is a cast-in-place beam or a prefabricated beam;

[0016] Reserved steel bars are arranged at the formed end of the bridge body, and the reserved steel bars are arranged along the width direction of the bridge body. The reserved steel bars are tied together with the steel mesh, which is conducive to the reliable connection of the finally formed guardrail and drip eaves concrete components with the bridge body.

[0017] In a bridge structure with a drip eave as described above, the steel mesh includes longitudinal steel bars arranged in the portion of the bridge body that exceeds its formed side, the guardrail, and the drip eave, the annular steel bars are divided into multiple sections, part of the annular steel bars are connected to the outer longitudinal steel bars, part of the annular steel bars are connected to the inner longitudinal steel bars, and the lower layer of the portion of the bridge body that exceeds its formed side is provided with two layers of longitudinal steel bars, and each layer is provided with two longitudinal steel bars.

[0018] A bridge structure with a drip eave as described above, wherein the inner side surface of the guardrail includes a first convex portion, a first oblique line segment, a second oblique line segment, a third oblique line segment and a fourth straight line segment connected in sequence, the length of the second oblique line segment is greater than the lengths of the first oblique line segment and the third oblique line segment, the slope of the second oblique line segment is less than the slope of the first oblique line segment, the slope of the third oblique line segment is less than the slope of the second oblique line segment, and the height of the fourth straight line segment is greater than the height of the bridge deck pavement layer.

[0019] In a second aspect, the present invention further provides a construction method of a bridge structure with a drip eave, comprising the following contents:

[0020] When manufacturing the bridge body, the width of the bridge body when formed is smaller than the design width of the bridge body;

[0021] The part of the bridge body that exceeds its formed side is tied with steel bars to the guardrail and drip eaves. The part of the bridge body that exceeds its formed side is tied with steel bars in the guardrail and drip eaves as a whole. The distance between the steel bars in the drip eaves and the steel bars in the part of the bridge body that exceeds its formed side is greater than the diameter of the vibrator.

[0022] The casting templates are fixed on the outer side, inner side and bottom side of the guardrail and dripping eaves respectively. After the fixing is completed, the casting is started so that the part of the bridge body that exceeds its formed side is cast and formed integrally with the guardrail and dripping eaves;

[0023] Insert the vibrating rod from the top of the guardrail and allow the bottom of the vibrating rod to enter between the drip eave and the formed side of the bridge body for vibration.

[0024] In the construction method of a bridge structure with a drip eave as described above, the formed side of the bridge body is roughened before tying the steel bars, so as to facilitate the integrity of the portion of the bridge body that extends beyond its formed side with the drip eave and guardrail.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1) In the present invention, the width of the bridge body is smaller than the design width, so that space is made for the entry of the vibrator during the concrete forming process. The distance between the outer side of the drip eaves and the formed side of the bridge body is 2cm-7cm larger than the diameter of the vibrator. In this way, it is ensured that after the steel bars are tied, the vibrator can still enter between the part of the bridge body that exceeds its formed side and the drip eaves, which is conducive to more compact concrete vibration and avoids the drop of the drip eaves.

[0027] 2) In the present invention, an oblique line with the same slope is used on the back side of the guardrail to avoid the existence of a broken line on the back side of the guardrail, which is further conducive to the vibrator entering between the portion of the bridge body that exceeds its formed side and the outer side of the drip eaves, thereby facilitating operation; a steel mesh tied together is arranged inside the guardrail, inside the drip eaves, and inside the portion of the bridge body that exceeds its formed side, effectively ensuring the integrity of the final integrally formed guardrail and drip eaves concrete components.

[0028] 3) The width of the bridge body during molding in the present invention is 12cm-18cm smaller than the design width of the bridge body, which effectively makes room for the width of the drip eaves, so that the width is reduced to no more than 10cm, which is beneficial to the vibration of the vibrator and effectively reduces the amount of concrete.

[0029] 4) The width of the top of the guardrail in the present invention is 22cm-25cm, which is larger than the current 20cm. It is not only conducive to the lowering of the vibrating rod, allowing the vibrating rod to enter between the casting templates on both sides, providing a larger operating space, but also convenient for the installation of the base steel plates such as the sound barrier and lighting lamp holder on the top of the guardrail.

[0030] 5) In the present invention, because the bridge body leaves space to ensure operating space, the side of the bridge body after forming can be roughened, which is convenient for construction and ensures the roughening effect, so that the side of the bridge body after forming forms a rough surface. This is beneficial to the integrity of the part of the bridge body that exceeds its formed side and the drip eaves and guardrails during the concrete pouring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] Figure 1 This is a photo of the drip eaves after it falls off in the prior art.

[0033] Figure 2 It is an enlarged schematic diagram of a drip eave arranged at a guardrail in the prior art.

[0034] Figure 3 It is an enlarged schematic diagram of a guardrail in a bridge structure with a drip eave according to one or more embodiments of the present invention.

[0035] Figure 4 It is a schematic cross-sectional view of the interior of a guardrail in a bridge structure with a drip eave according to one or more embodiments of the present invention.

[0036] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0037] Among them: 1. drip eaves, 2. back side of guardrail, 3. guardrail, 4. bridge body, 5. bridge deck pavement, 6. part of the bridge body beyond its formed side, 7. longitudinal reinforcement, 8. hoop reinforcement, 9. middle longitudinal reinforcement;

[0038] 3-1. first convex portion, 3-2. first oblique line segment, 3-3. second oblique line segment, 3-4. third oblique line segment, 3-5. fourth straight line segment;

[0039] 8-1. The first steel bar, 8-2. The second steel bar, 8-3. The third steel bar. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0042] As introduced in the background technology, the prior art has the problem that the drip eaves on the back of the guardrail are easy to fall off and may cause safety accidents. In order to solve the above technical problems, the present invention proposes a bridge structure with a drip eaves.

[0043] Embodiment 1

[0044] In a typical embodiment of the present invention, reference is made to Figure 3As shown, a bridge structure with a drip eave comprises a bridge body 4, the width of the bridge body 4 when formed is smaller than the design width of the bridge body, the guardrail 3 with the drip eaves is located on the end side of the bridge body, the distance between the outer side surface of the drip eaves 1 and the formed side surface of the bridge body is 2cm-7cm larger than the diameter of the vibrator, a steel mesh is arranged in the connection between the portion 6 of the bridge body extending beyond its formed side surface and the guardrail 3 and the drip eaves 1, the portion 6 of the bridge body extending beyond its formed side surface is integrally cast with the guardrail 3 and the drip eaves 1, and the back side 2 of the guardrail adopts an oblique line with the same slope to facilitate the vibrator to enter between the drip eaves and the formed side surface of the bridge body.

[0045] It should be noted that the width of the bridge body 4 during molding is 12cm-18cm smaller than the design width of the bridge body, and the width of the drip eave is 4cm-8cm, which reduces the amount of concrete while achieving vibration.

[0046] In this embodiment, the width of the bridge body 4 during molding is 15 cm smaller than the designed width of the bridge body, and the width of the drip edge is 5 cm.

[0047] It is easy to understand that the width of the top of the guardrail 3 is 22cm-25cm, and can be 23cm, and the width of the bottom of the guardrail is 48cm-52cm, and can be 50cm.

[0048] In this embodiment, the distance between the top of the back side 2 of the guardrail and the outer side of the drip eaves is 7cm-8cm, and the top of the back side 2 of the guardrail is set toward the direction of the bridge body relative to the outer side of the drip eaves, which may be specifically 7cm; considering the design height of the guardrail, the slope of the oblique line on the back side of the guardrail is 15-17.1.

[0049] The bottom surface of the dripping eave 1 is arranged to be inclined upward, and the bottom surface of the portion of the bridge body that exceeds its formed side surface is arranged in the same plane as the bottom surface of the dripping eave.

[0050] It is easy to understand that the bridge body 4 is a cast-in-place beam or a prefabricated beam, and the bridge body includes a bridge deck and a crossbeam supporting the bridge deck;

[0051] It can be understood that the inner side surface of the guardrail 3 includes a first convex portion 3-1, a first oblique line segment 3-2, a second oblique line segment 3-3, a third oblique line segment 3-4 and a fourth straight line segment 3-5 which are connected in sequence, the first convex portion 3-1 is a semicircular convex portion, the first convex portion protrudes toward the direction of the bridge body 4, the length of the second oblique line segment 3-3 is greater than the lengths of the first oblique line segment 3-2 and the third oblique line segment 3-4, the slope of the second oblique line segment 3-3 is less than the slope of the first oblique line segment 3-2, the slope of the third oblique line segment 3-3 is less than the slope of the second oblique line segment 3-2, and the height of the fourth straight line segment 3-5 is greater than the height of the bridge deck pavement layer 5.

[0052] Among them, the part 6 of the bridge body that exceeds its formed side surface, the guardrail 3, and the steel mesh in the drip eaves 1 include longitudinal steel bars 7 arranged along the length direction of the bridge, and the longitudinal steel bars 7 are arranged in multiple layers, and the two adjacent layers of longitudinal steel bars 7 are set at a distance. The longitudinal steel bars 7 are arranged on the two side surfaces of the part 6 of the bridge body that exceeds its formed side surface, the guardrail 3, and the drip eaves 1. The bottom side between the part 6 of the bridge body that exceeds its formed side surface and the outer side surface of the drip eaves is also provided with longitudinal steel bars. The setting position of the longitudinal steel bars is set in a circle along the shape of the guardrail and the drip eaves. The annular steel bars 8 are arranged around the longitudinal steel bars on one side, the longitudinal steel bars on the bottom side and the longitudinal steel bars on the other side, and are respectively connected to each layer of longitudinal steel bars. The top of the annular steel bars is opened, thereby forming a relatively strong steel mesh.

[0053] Considering the convenience of construction, the annular reinforcement 8 is disconnected at the supporting beam of the bridge body, so that the annular reinforcement includes the first reinforcement 8-1, the second reinforcement 8-2 and the third reinforcement 8-3. The first reinforcement 8-1 starts from the two first-layer longitudinal reinforcements at the top of the guardrail, connects to the longitudinal reinforcement on the outside of the drip eaves, bends and then bypasses the longitudinal reinforcement at the part of the bridge body that exceeds its formed side. Considering the width of the bottom side of the guardrail, two layers of longitudinal reinforcement 7 are arranged at the bottom inside the guardrail 3, that is, there is a longitudinal reinforcement located on the inside of the connection between the third oblique segment and the fourth straight segment of the guardrail, the second reinforcement 8-2 is located on the opposite side of the first reinforcement, the second reinforcement connects multiple longitudinal reinforcements on the inside of the guardrail, and the third reinforcement 8-3 connects four longitudinal reinforcements at the lower position on the inside of the guardrail.

[0054] It should be noted that reserved steel bars are provided at the lower formed end of the bridge body 4 (the end in the width direction of the beam), and the reserved steel bars are arranged along the width direction of the bridge body. The reserved steel bars extend from the formed end of the bridge body 4, and the reserved steel bars are arranged along the width direction of the bridge body 4. Under the action of external force, the reserved steel bars are bent so that the longitudinal steel bars close to the reserved steel bars (the longitudinal steel bars at the part of the bridge body that exceeds its formed side) and the first steel bars in the annular steel bars are tied together. After binding, the vibrator can still enter the formed end of the bridge body and the drip eaves, which is conducive to the reliable connection of the finally formed guardrail and drip eaves concrete components with the bridge body.

[0055] refer to Figure 4As shown, in some examples, in order to prevent the drip eaves from accidentally falling off and ensure the structural strength of the drip eaves, two layers of longitudinal steel bars 7 are arranged in the lower layer of the part 6 of the bridge body that exceeds its formed side surface, and each layer is provided with two longitudinal steel bars, that is, an intermediate longitudinal steel bar 9 is arranged on the inner side of the side longitudinal steel bar, and a distance is set between the intermediate longitudinal steel bar 9 and the side longitudinal steel bars in the part of the bridge body that exceeds its formed side surface, and the intermediate longitudinal steel bar 9 is staggered with the longitudinal steel bars at the drip eaves, while the vibrator can still enter the upper layer between the part 6 of the bridge body that exceeds its formed side surface and the outer side of the drip eaves, so that the concrete density at this position is guaranteed under the premise of enhancing the connection strength between the drip eaves and the part 6 of the bridge body that exceeds its formed side surface.

[0056] In the bridge structure provided in this embodiment, the width of the bridge body 4 is smaller than the designed width, so that space is made for the entry of the vibrating rod during the concrete forming process. The distance between the outer side surface of the drip eaves and the formed side surface of the bridge body is 2cm-7cm larger than the diameter of the vibrating rod. In this way, it is ensured that after the steel bars are tied, the vibrating rod can still enter between the part of the bridge body that exceeds its formed side surface and the drip eaves, which is conducive to more compact concrete vibration and avoids the falling of the drip eaves.

[0057] Embodiment 2

[0058] This embodiment discloses a construction method of a bridge structure with a drip eave, including the following contents:

[0059] Manufacturing a bridge body 4, wherein the width of the bridge body 4 when formed is smaller than the designed width of the bridge body;

[0060] The portion 6 of the bridge body that exceeds the formed side surface is tied with the guardrail 2 and the dripping eave 1, and the portion of the bridge body that exceeds the formed side surface is tied with the guardrail and the steel bars in the dripping eave as a whole, and the distance between the steel bars in the dripping eave and the steel bars in the portion of the bridge body that exceeds the formed side surface is greater than the diameter of the vibrator;

[0061] The casting templates are fixed on the outer side, inner side and bottom side of the guardrail and dripping eaves respectively. After the fixing is completed, the casting is started so that the part of the bridge body that exceeds its formed side is cast and formed integrally with the guardrail and dripping eaves;

[0062] Insert the vibrating rod from the top of the guardrail and allow the bottom of the vibrating rod to enter between the drip eave and the formed side of the bridge body for vibration.

[0063] In this embodiment, the side surfaces of the bridge body after forming are roughened so that the side surfaces of the bridge body after forming form a rough surface. This is beneficial to the integrity of the portion of the bridge body that extends beyond its formed side surfaces with the drip eaves and guardrails during the concrete pouring process.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bridge structure with a drip eave, characterized in that: Including the bridge body, the width of the bridge body during molding is smaller than the design width of the bridge body, the guardrail with the drip eaves is located on the end side of the bridge body, the distance between the outer side of the drip eaves and the molded side of the bridge body is 2cm-7cm larger than the diameter of the vibrator, a steel mesh is arranged in the connection between the part of the bridge body extending beyond its molded side and the guardrail and the drip eaves, the part of the bridge body extending beyond its molded side is cast and molded integrally with the guardrail and the drip eaves, and an oblique line with the same slope is adopted on the back side of the guardrail to facilitate the vibrator to enter between the drip eaves and the molded side of the bridge body.

2. A bridge structure with drip eaves according to claim 1, characterized in that: The width of the bridge body during molding is 12cm-18cm smaller than the designed width of the bridge body, and the width of the drip eave is 4cm-8cm, which reduces the amount of concrete while achieving vibration.

3. The bridge structure with drip eaves according to claim 1, characterized in that: The width of the top of the guardrail is 22cm-25cm, and the width of the bottom of the guardrail is 48cm-52cm.

4. The bridge structure with drip eaves according to claim 1, characterized in that: The distance between the top of the back side of the guardrail and the outer side of the drip eaves is 7-8 cm; The slope of the back side of the guardrail is 15-17.

1.

5. The bridge structure with drip eaves according to claim 1, characterized in that: The bottom surface of the dripping eave is arranged to be inclined upward, and the bottom surface of the portion of the bridge body that exceeds its formed side surface is arranged in the same plane as the bottom surface of the dripping eave.

6. The bridge structure with drip eaves according to claim 1, characterized in that: The bridge body is a cast-in-place beam or a prefabricated beam; The formed end of the bridge body is provided with reserved steel bars, which are arranged along the width direction of the bridge body and are tied together with the steel mesh.

7. The bridge structure with drip eaves according to claim 1, characterized in that: The steel mesh includes longitudinal steel bars arranged in the part of the bridge body that exceeds its formed side, guardrails, and drip eaves. The circumferential steel bars are divided into multiple sections. Part of the circumferential steel bars are connected to the longitudinal steel bars on the outside, and part of the circumferential steel bars are connected to the longitudinal steel bars on the inside. Two layers of longitudinal steel bars are arranged on the lower layer of the part of the bridge body that exceeds its formed side, and each layer is provided with two longitudinal steel bars.

8. The bridge structure with drip eaves according to claim 1, characterized in that: The inner side surface of the guardrail includes a first convex portion, a first oblique line segment, a second oblique line segment, a third oblique line segment and a fourth straight line segment connected in sequence, the length of the second oblique line segment is greater than the lengths of the first oblique line segment and the third oblique line segment, the slope of the second oblique line segment is less than the slope of the first oblique line segment, the slope of the third oblique line segment is less than the slope of the second oblique line segment, and the height of the fourth straight line segment is greater than the height of the bridge deck pavement layer.

9. A construction method for a bridge structure with a drip eave according to any one of claims 1 to 8, characterized in that: It includes the following: When manufacturing the bridge body, the width of the bridge body when formed is smaller than the design width of the bridge body; The part of the bridge body that exceeds its formed side is tied with steel bars to the guardrail and drip eaves. The part of the bridge body that exceeds its formed side is tied with steel bars in the guardrail and drip eaves as a whole. The distance between the steel bars in the drip eaves and the steel bars in the part of the bridge body that exceeds its formed side is greater than the diameter of the vibrator. The casting templates are fixed on the outer side, inner side and bottom side of the guardrail and dripping eaves respectively. After the fixing is completed, the casting is started so that the part of the bridge body that exceeds its formed side is cast and formed integrally with the guardrail and dripping eaves; Insert the vibrating rod from the top of the guardrail and allow the bottom of the vibrating rod to enter between the drip eave and the formed side of the bridge body for vibration.

10. The construction method of a bridge structure with a drip eave according to claim 9, characterized in that: Before tying the steel bars, the sides of the bridge body after being formed are roughened to facilitate the integrity of the portion of the bridge body that extends beyond the formed sides and the drip eaves and guardrails.

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