A prefabricated assembled anti-collision wall for replacing old bridge and its construction method

Abstract

The present invention provides a prefabricated assembled crash barrier for replacing an old bridge and a construction method thereof. The prefabricated assembled crash barrier comprises a prefabricated concrete crash barrier body and a steel railing. The concrete crash barrier body is formed with a hoisting hole and a plurality of crash barrier convex strips during production. A prefabricated steel plate and anchor bars are embedded in the top of the concrete crash barrier body, and a reserved protruding steel bar is embedded in the bottom. The bottom of the steel railing is welded to the top of the prefabricated steel plate. The prefabricated assembled crash barrier of the present invention is prefabricated in a factory and can be mass-produced, and the quality of the components and the appearance can be well controlled. The hoisting hole is convenient for hoisting and transportation, and the crash barrier convex strips can have a good visual effect. The steel railing is connected to the prefabricated assembled crash barrier as a whole, which further increases the beautification effect. The prefabricated assembled crash barrier of the present invention has a beautiful appearance, a simple structure, is safe and reliable, is convenient for disassembly and replacement, is convenient for construction, has a short construction period, has little impact on traffic during the construction process, and has good economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge design and construction, and in particular relates to a prefabricated assembled anti-collision wall for replacing an old bridge and a construction method thereof. Background Art

[0002] With the construction of a large number of interchanges and viaducts in cities, bridges have become a scenic spot in the city. People not only require bridges to have safe and fast functions, but also have high requirements for their aesthetics. As an important safety protection facility on both sides of the bridge, the crash barrier can not only play a buffering role, reduce the impact damage of vehicles, and reduce the harm and impact caused by vehicle accidents, but also is an important reason affecting the appearance quality of the bridge. Due to its age, the crash barriers of bridges built in the early days generally do not meet the current traffic safety facility specifications, have poor appearance, and some bridge crash barriers are damaged, which seriously affects the use and beauty of the bridge crash barriers. Especially for bridges located in the core area of ​​the city, the surrounding landscape requirements are very high. The appearance of the old crash barrier is poor and inconsistent with the surrounding landscape. The crash barrier of the old bridge needs to be replaced and optimized.

[0003] In addition, in modern urban construction, the speed and quality of the project directly affect the operation and development of modern cities. Prefabrication and assembly technology has the advantages of fast construction speed, easy to ensure the quality of components, and small requirements for construction sites. The prefabrication and assembly method of the anti-collision wall can not only shorten the construction period of replacing the anti-collision wall of the existing bridge and reduce the adverse impact of the construction process on traffic, but also the production quality and appearance of the anti-collision wall prefabricated in the factory can be better controlled.

[0004] Therefore, it is urgent to invent a new type of bridge crash wall structure that can be prefabricated and assembled, is easy to install, has good appearance and economic benefits. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a prefabricated assembled crash barrier for replacing old bridges and a construction method thereof, aiming to solve the problem that the crash barriers of old bridges in the prior art do not meet the current traffic safety facility specifications, have poor appearance, and some bridge crash barriers are damaged, but it is not convenient to pour the crash barrier concrete on site.

[0006] The present invention is implemented as follows: a prefabricated assembled crash barrier for replacing an old bridge comprises a prefabricated concrete crash barrier body and a steel railing, wherein the concrete crash barrier body is formed with a hoisting hole and a plurality of spaced crash barrier convex strips when being manufactured, and the plurality of crash barrier convex strips are located on the vehicle-facing surface of the concrete crash barrier body; a prefabricated steel plate and anchor bars are embedded in the top of the concrete crash barrier body when being manufactured, wherein the bottom of the prefabricated steel plate is welded to the top of the anchor bar, and the top of the prefabricated steel plate is exposed to the top surface of the concrete crash barrier body; a reserved protruding steel bar is first embedded in the bottom of the concrete crash barrier body when being manufactured, and one end of the reserved protruding steel bar is embedded in the concrete crash barrier body, and the other end protrudes out of the vehicle-facing surface of the concrete crash barrier body; the bottom of the steel railing is welded to the top of the prefabricated steel plate.

[0007] Furthermore, the steel railing includes a horizontal bar and a vertical bar, the length direction of the horizontal bar extends along the length direction of the prefabricated concrete crash barrier body, the top of the vertical bar is welded to the horizontal bar, and the bottom of the vertical bar is welded to the prefabricated steel plate.

[0008] Furthermore, the hoisting hole is opened in the middle of the prefabricated concrete anti-collision wall body.

[0009] Furthermore, the diameter of the lifting hole is 50 mm.

[0010] Furthermore, the cross section of the anti-collision surface convex strip is trapezoidal, and the height of the anti-collision surface convex strip is 30 mm.

[0011] In order to solve the above technical problems, the present invention also provides a construction method of a prefabricated assembled crash barrier for replacing an old bridge, which at least comprises the following steps:

[0012] S10. Chisel away the original bridge pavement within 3m of the old crash barrier and retain the original bridge pavement reinforcement;

[0013] S20. Remove the old crash barrier and roughen the surface of the beam structure to create a concave and convex surface of no less than 6 mm. The bottom of the new prefabricated crash barrier to be installed needs to be chiseled to a depth of 20 mm.

[0014] S30, after cleaning the roughened surface of the beam structure, apply a cement-based interface agent;

[0015] S40, after the additional reinforcement is welded and fixed to the reinforcement of the original bridge pavement layer, the first portion of epoxy fine stone concrete is poured, and one end of the additional reinforcement is first buried in the first portion of epoxy fine stone concrete;

[0016] S50, laying a mortar cushion layer at the bottom of the new prefabricated assembled crash barrier, and then installing the new prefabricated assembled crash barrier in place, and welding and fixing the reserved extended steel bars of the prefabricated assembled crash barrier to the additional steel bars;

[0017] S60, after all the prefabricated assembled crash barriers are installed, pour the second part of epoxy fine stone concrete;

[0018] S70. Within 0.5m of the bottom of the frontal surface of the prefabricated assembled crash barrier, after laying reinforcement steel bars in both directions, pour the third part of epoxy fine stone concrete;

[0019] S80. Finally, pour the asphalt waterproof layer and the asphalt concrete paving layer, thus completing the construction of replacing the old crash wall with the prefabricated crash wall.

[0020] Furthermore, in step S40, the additional steel bars are HRB400 hot-rolled ribbed steel bars with a diameter of 20 mm, a steel bar spacing of 200 mm, a length of 2 m, and a length of 1.5 m buried in the first portion of epoxy fine stone concrete.

[0021] Furthermore, in step S50, the mortar cushion layer adopts TGM60 high-strength mortar cushion layer.

[0022] Furthermore, in step S60, the reinforcing steel bars are HRB400 hot-rolled ribbed steel bars with a diameter of 10 mm and a steel bar spacing of 150 mm.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] 1. Prefabricated assembled anti-collision walls are prefabricated in factories and can be mass-produced, and the quality of components and appearance can be better controlled.

[0025] 2. The prefabricated assembled anti-collision wall is pre-equipped with lifting holes to facilitate the lifting and transportation of the prefabricated assembled anti-collision wall.

[0026] 3. Prefabricated assembled anti-collision walls are pre-equipped with anti-collision surface convex strips, which can play a beautifying function and improve the quality of the anti-collision wall.

[0027] 4. The steel railings and prefabricated assembled anti-collision walls are connected as a whole, further enhancing the beautification effect.

[0028] 5. The reserved overhanging steel bars at the bottom of the prefabricated assembled crash barrier are fixed by overlapping the steel bars of the original bridge pavement layer with additional steel bars. When the crash barrier is hit by a vehicle, the front wheels of the vehicle press on the reserved overhanging steel bars at the bottom of the prefabricated assembled crash barrier, which can play a self-balancing role and prevent the crash barrier from overturning.

[0029] 6. The prefabricated assembled crash barrier has a simple structure, convenient construction, short construction period, little impact on traffic during the construction process, and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a prefabricated assembled crash barrier for replacing an old bridge provided by an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A schematic diagram of a portion of the oncoming surface of the prefabricated assembled crash wall;

[0032] Figure 3 yes Figure 2 Schematic cross-sectional view along the aa section line;

[0033] Figure 4 It is a structural schematic diagram of the prefabricated assembled crash wall of this embodiment, in which the crash wall and the beam body are assembled and connected.

[0034] In the figure: 100-beam structure; 1-concrete anti-collision wall body; 2-steel railing; 21-cross bar; 22-vertical bar; 3-lifting hole; 4-anti-collision surface convex strip; 5-prefabricated steel plate; 6-anchor bar; 7-reserved protruding steel bar; 8-original bridge pavement layer; 9-original bridge pavement layer steel bar; 10-additional steel bar; 111-epoxy fine stone concrete of the first part; 112-epoxy fine stone concrete of the second part; 113-epoxy fine stone concrete of the third part; 12-mortar cushion layer; 13-reinforcement steel bar; 14-asphalt waterproofing layer and asphalt concrete pavement layer. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] See also Figure 1 and Figure 2 , shows a preferred embodiment of the present invention, which provides a prefabricated assembled crash barrier for replacing an old bridge, which includes a prefabricated concrete crash barrier body 1 and a steel railing 2.

[0038] The concrete anti-collision wall body 1 is formed with a hoisting hole 3 and a plurality of anti-collision surface convex strips 4 distributed at intervals during production. Figure 3 In this embodiment, the cross section of the anti-collision surface convex strip 4 is trapezoidal, and the height of the anti-collision surface convex strip 4 is 30 mm. A plurality of spaced anti-collision surface convex strips 4 are all located on the vehicle-facing surface of the concrete anti-collision wall body 1, and the anti-collision surface convex strips 4 can play a certain role in increasing beauty and improving quality.

[0039] The top of the concrete anti-collision wall body 1 is embedded with a prefabricated steel plate 5 and anchor bars 6 during production. In this embodiment, the anchor bars 6 are HPB300 hot-rolled ribbed steel bars with a diameter of 16 mm. The bottom of the prefabricated steel plate 5 is welded to the top of the anchor bars 6, and the top of the prefabricated steel plate 5 is exposed from the top surface of the concrete anti-collision wall body 1.

[0040] The bottom of the concrete crash barrier body 1 is first embedded with reserved protruding steel bars 7 during production. In this embodiment, the reserved protruding steel bars 7 are HRB400 hot-rolled ribbed steel bars with a diameter of 20 mm. One end of the reserved protruding steel bars 7 is embedded in the concrete crash barrier body 1, and the other end extends out of the vehicle-facing surface of the concrete crash barrier body 1. The reserved protruding steel bars 7 at the bottom of the prefabricated crash barrier are fixed to the original bridge pavement steel bars 9 by adding steel bars 10. When the crash barrier is hit by a vehicle, the front wheels of the vehicle press on the reserved protruding steel bars 7 at the bottom of the prefabricated crash barrier, which can play a self-balancing role.

[0041] The bottom of the steel railing 2 is welded to the top of the prefabricated steel plate 5. In this embodiment, the prefabricated steel plate 5 is a 150×150×5mm galvanized steel plate. The steel railing 2 is integrally connected to the concrete anti-collision wall body 1, which can further enhance the beautification effect.

[0042] The steel railing 2 includes a horizontal bar 21 and a vertical bar 22. The length direction of the horizontal bar 21 extends along the length direction of the prefabricated concrete crash barrier body 1, the top of the vertical bar 22 is welded to the horizontal bar 21, and the bottom of the vertical bar 22 is welded to the prefabricated steel plate 5. In this embodiment, the vertical bar 22 is made of 100×50×5mm galvanized steel plate, and the horizontal bar 21 is made of 5mm thick galvanized steel railing.

[0043] The hoisting hole 3 is opened in the middle of the prefabricated concrete anti-collision wall body 1. The diameter of the hoisting hole 3 is 50 mm. The prefabricated assembled anti-collision wall is pre-equipped with a hoisting hole 3 to facilitate the hoisting and transportation of the prefabricated assembled anti-collision wall.

[0044] It can be seen that the prefabricated assembled crash barrier of this embodiment can be prefabricated in a factory and can be mass-produced, and the quality of the components and the appearance can be well controlled.

[0045] See also Figure 4 This embodiment also provides a construction method for a prefabricated assembled crash barrier for replacing an old bridge, and the specific steps are as follows:

[0046] S10, chiseling away the original bridge pavement layer 8 within 3m of the old crash barrier, and retaining the original bridge pavement layer steel bars 9;

[0047] S20, dismantle the original old crash barrier, and roughen the surface of the beam structure 100, and chisel out a concave and convex surface of no less than 6 mm. At the bottom of the new prefabricated crash barrier to be installed, a depth of 20 mm needs to be chiseled;

[0048] S30, cleaning the roughened surface of the beam structure 100, and applying a cement-based interface agent;

[0049] S40, after welding and fixing the additional steel bars 10 to the original bridge pavement steel bars 9, pour the first part of epoxy fine stone concrete 111, and bury one end of the additional steel bars 10 in the first part of epoxy fine stone concrete 111; wherein the additional steel bars 10 are HRB400 hot-rolled ribbed steel bars with a diameter of 20 mm, the spacing of the additional steel bars 10 is 200 mm, the length is 2 m, and the length buried in the first part of epoxy fine stone concrete 111 is 1.5 m;

[0050] S50, laying a mortar cushion layer 12 at the bottom of the new prefabricated assembled crash barrier, and then installing the new prefabricated assembled crash barrier in place, and welding and fixing the reserved extended steel bars 7 and the additional steel bars 10 of the prefabricated assembled crash barrier; the mortar cushion layer 12 adopts TGM60 high-strength mortar cushion layer;

[0051] S60, after all the prefabricated assembled crash barriers are installed, pour the second part of epoxy fine stone concrete 112;

[0052] S70, within the range of 0.5m at the bottom of the front face of the prefabricated anti-collision wall, after laying the reinforcing steel bars 13 in both directions, pour the third part of epoxy fine stone concrete 113; the reinforcing steel bars 13 are HRB400 hot-rolled ribbed steel bars with a diameter of 10mm, and the spacing between the reinforcing steel bars 13 is 150mm;

[0053] S80, finally pouring the asphalt waterproof layer and the asphalt concrete paving layer 14, that is, completing the construction of replacing the old crash barrier with the prefabricated assembled crash barrier.

[0054] The prefabricated assembled crash barrier of this embodiment has a simple structure, is convenient to construct, has a short construction period, has little impact on traffic during the construction process, and has good economic benefits.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a prefabricated assembled crash barrier for replacing an old bridge, the prefabricated assembled crash barrier comprising a prefabricated concrete crash barrier body and a steel railing, the concrete crash barrier body is formed with a hoisting hole and a plurality of spaced crash barrier convex strips when it is manufactured, the plurality of crash barrier convex strips are located on the vehicle-facing surface of the concrete crash barrier body; a prefabricated steel plate and anchor bars are embedded in the top of the concrete crash barrier body when it is manufactured, wherein: The bottom of the prefabricated steel plate is welded to the top of the anchor bar, and the top of the prefabricated steel plate is exposed to the top surface of the concrete anti-collision wall body; when the concrete anti-collision wall body is manufactured, a reserved protruding steel bar is first buried in the bottom of the concrete anti-collision wall body, one end of the reserved protruding steel bar is embedded in the concrete anti-collision wall body, and the other end extends out of the vehicle-facing surface of the concrete anti-collision wall body; the bottom of the steel railing is welded to the top of the prefabricated steel plate, and the construction method includes at least the following steps: S10. Chisel away the original bridge pavement within 3m of the old crash barrier and retain the original bridge pavement reinforcement; S20. Remove the old crash barrier and roughen the surface of the beam structure to create a concave and convex surface of no less than 6 mm. The bottom of the new prefabricated crash barrier to be installed needs to be chiseled to a depth of 20 mm. S30, after cleaning the roughened surface of the beam structure, apply a cement-based interface agent; S40, after the additional reinforcement is welded and fixed to the reinforcement of the original bridge pavement layer, the first portion of epoxy fine stone concrete is poured, and one end of the additional reinforcement is first buried in the first portion of epoxy fine stone concrete; S50, laying a mortar cushion layer at the bottom of the new prefabricated assembled crash barrier, and then installing the new prefabricated assembled crash barrier in place, and welding and fixing the reserved extended steel bars of the prefabricated assembled crash barrier to the additional steel bars; S60, after all the prefabricated assembled crash barriers are installed, pour the second part of epoxy fine stone concrete; S70. Within 0.5m of the bottom of the frontal surface of the prefabricated assembled crash barrier, after laying reinforcement steel bars in both directions, pour the third part of epoxy fine stone concrete; S80. Finally, pour the asphalt waterproof layer and the asphalt concrete paving layer, thus completing the construction of replacing the old crash wall with the prefabricated crash wall.

2. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: In step S40, the additional steel bars are HRB400 hot-rolled ribbed steel bars with a diameter of 20 mm, a steel bar spacing of 200 mm, a length of 2 m, and a length of 1.5 m buried in the first portion of epoxy fine stone concrete.

3. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: In step S50, the mortar cushion layer adopts TGM60 high-strength mortar cushion layer.

4. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: In step S60, the reinforcing steel bars are HRB400 hot-rolled ribbed steel bars with a diameter of 10 mm and a steel bar spacing of 150 mm.

5. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: The steel railing includes a horizontal bar and a vertical bar. The length direction of the horizontal bar extends along the length direction of the prefabricated concrete anti-collision wall body. The top of the vertical bar is welded to the horizontal bar, and the bottom of the vertical bar is welded to the prefabricated steel plate.

6. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: The hoisting hole is arranged in the middle of the prefabricated concrete anti-collision wall body.

7. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: The diameter of the lifting hole is 50 mm.

8. The construction method of the prefabricated assembled crash barrier for replacing an old bridge as claimed in claim 1, characterized in that: The cross section of the anti-collision surface convex strip is trapezoidal, and the height of the anti-collision surface convex strip is 30 mm.

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