UHPC prefabricated formwork structure applied to corrosion prevention of bridge concrete anti-collision wall

Abstract

The utility model discloses a UHPC (Ultra High Performance Concrete) prefabricated template structure applied to corrosion prevention of a bridge concrete anti-collision wall, which belongs to the technical field of bridge engineering technologies and is characterized in that a UHPC prefabricated slab is embedded at the root of a head-on collision surface of the concrete anti-collision wall. The UHPC prefabricated slab has the advantages of high strength, high density, high degree of finish, high corrosion resistance, high durability, high impact resistance, standard and neat appearance and the like, personalized design of the structure size of the UHPC prefabricated slab can be achieved according to the shape of the inner side of the anti-collision wall, and the effect of convenient installation and construction is achieved. The problem of quality defects of the root of the concrete anti-collision wall can be effectively solved, the salt corrosion problem of the root of the anti-collision wall is reduced, the overall quality of the anti-collision wall is improved, the service life of the anti-collision wall is effectively prolonged, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and in particular relates to a UHPC prefabricated template structure used for corrosion protection of concrete anti-collision walls of bridges. Background Art

[0002] As the main safety protection component of road bridges, crash barriers can effectively reduce the possibility of traffic accidents. At present, ordinary reinforced concrete crash barriers are the main structural form used in highway bridges in my country. However, ordinary concrete has disadvantages such as poor impact resistance, low strength, low deformation capacity, and insufficient durability, which causes the surface of ordinary concrete to fall off, and the internal steel bars are exposed and corroded, which reduces the strength of the crash barrier and deteriorates the crash resistance. Especially in the northeast region of my country, due to the low annual average temperature, large daily temperature difference, and more rain and snow in winter, in order to ensure the smooth flow of roads, a large amount of deicing salt is often spread on the highway. The root of the crash barrier is directly in contact with chloride salt, especially in the freeze-thaw environment. The concrete salt corrosion disease is particularly prominent, which accelerates the deterioration of the concrete at the root of the crash barrier and the corrosion of the steel bars, which not only affects the beauty of the structure, but also causes irreversible damage to the stability and bearing capacity of the structure, greatly shortening the service life of the structure. Utility Model Content

[0003] In view of this, the utility model provides a UHPC prefabricated formwork structure used for corrosion protection of concrete crash barriers of bridges, which gives full play to the advantages of ultra-high mechanical properties and excellent durability of UHPC prefabricated panels. The UHPC prefabricated panels are cast-in-place with the concrete crash barriers during construction, and have good integrity and compactness. They can effectively solve the problems of poor durability of concrete at the root of the crash barriers, poor construction quality, and salt-freezing damage to concrete.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] The utility model comprises a collision-proof wall front-end template and a collision-proof wall rear template. The root of the collision-proof wall front-end template is turned and two sides thereof are fitted with a layer of turned UHPC prefabricated panels. The UHPC prefabricated panels are integrated with the solidified concrete collision-proof wall.

[0006] Furthermore, it also includes a locking rod, which passes through the anti-collision wall collision surface template and the anti-collision wall rear template, the height of the locking rod is higher than the top height of the UHPC prefabricated panel, the locking rod is slidably provided with a wedge block at one end of the anti-collision wall collision surface template, and the locking rod is slidably provided with a square block at one end of the anti-collision wall rear template, and locking nuts are threadedly connected at both ends of the locking rod to fit and fix the wedge block to the outer side of the anti-collision wall collision surface template, and the square block is fit and fixed to the outer side of the rear template of the anti-collision wall.

[0007] Furthermore, an inclined pressure plate is fixed to the middle section of the locking rod. After the locking rod is fixed, the inclined pressure plate and the collision surface template of the anti-collision wall press the upper end of the UHPC prefabricated panel against the inner side of the collision surface template of the anti-collision wall.

[0008] Furthermore, the top ends of the anti-collision wall collision surface template and the anti-collision wall rear template are respectively fixed with stoppers, and the two corresponding stoppers are fixed by a pull rod.

[0009] Furthermore, a steel cage is provided between the anti-collision wall collision surface template and the anti-collision wall rear template, and the steel cage is 2-3 cm away from the UHPC prefabricated panel.

[0010] Furthermore, the UHPC prefabricated panel has a thickness of more than 1.5 cm and a length of between 1 m and 2 m.

[0011] The beneficial effects of the utility model are:

[0012] The utility model adopts UHPC with ultra-high mechanical properties and excellent durability as the prefabricated template material for concrete crash wall corrosion prevention, and the UHPC prefabricated board has the advantages of high density, high finish, high impact resistance, and standardized and neat appearance, which effectively improves the corrosion resistance of concrete crash wall, and thoroughly solves the problems of poor construction quality at the root of the inner side of the crash wall and poor durability of concrete, especially reducing the problem of salt corrosion at the root of the crash wall. The utility model helps to ensure the beauty of the outer side of the crash wall, improve the structural bearing capacity, effectively extend the service life of the crash wall, ensure the safe operation of the bridge structure, and reduce the operation and maintenance costs, which has important practical significance.

[0013] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0015] Figure 1 It is an overall schematic diagram of the prefabricated template structure of the embodiment of the utility model;

[0016] Figure 2 It is a cross-sectional view of the prefabricated template structure of the embodiment of the utility model;

[0017] Figure 3 This is a cross-sectional view of the anti-collision wall after pouring in the embodiment of the utility model;

[0018] The markings in the attached figure are as follows: 1. Anti-collision wall frontal template; 2. Anti-collision wall rear template; 3. UHPC prefabricated panel; 4. Locking rod; 5. Wedge block; 6. Square; 7. Locking nut; 8. Inclined pressure plate; 9. Stop block; 10. Pull rod; 11. Steel cage. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, the utility model discloses a UHPC prefabricated formwork structure applied to the corrosion protection of concrete crash barriers of bridges, comprising a crash wall collision surface formwork 1 and a crash wall rear formwork 2, wherein the root of the crash wall collision surface formwork 1 is turned and two sides thereof are bonded with a layer of turned UHPC prefabricated panels 3, the UHPC prefabricated panels 3 become one with the solidified concrete crash wall, and after solidification, the UHPC prefabricated panels 3 are embedded in the root of the concrete crash wall collision surface, and the shape of the UHPC prefabricated panels 3 is the same as the inner size of the concrete crash wall, wherein the UHPC prefabricated panels 3 have a compressive strength of more than 120 MPa, a freeze-thaw resistance cycle of more than 500 times, and a chloride ion migration coefficient of less than 0.2×10-12 m2 / s, the thickness of the UHPC prefabricated panels 3 is more than 1.5 cm, and the length should be between 1 m and 2 m, and when installing this prefabricated formwork structure, the bottom of the UHPC prefabricated panels 3 is placed on the bridge concrete pavement layer and is leveled with cement mortar.

[0020] This structure uses UHPC with ultra-high mechanical properties and excellent durability as the prefabricated formwork material for the concrete crash wall, and the UHPC prefabricated panel 3 has the advantages of high density, high finish, high impact resistance, and standardized and neat appearance, which effectively improves the corrosion resistance of the concrete crash wall, and completely solves the problems of poor construction quality at the root of the inner side of the crash wall and poor durability of concrete, especially reducing the problem of salt corrosion at the root of the crash wall. The UHPC prefabricated panel 3 is solidified on the collision surface of the concrete crash wall by embedding the template, so that the surface of the crash wall is still smooth, which helps to ensure the beauty of the outer side of the crash wall, improve the structural bearing capacity, effectively extend the service life of the crash wall, and ensure the safe operation of the bridge structure and reduce the operation and maintenance costs. It has important practical significance.

[0021] In a further solution, Figure 2 As shown, it also includes a locking rod 4, which passes through the anti-collision wall collision surface template 1 and the anti-collision wall rear template 2. The height of the locking rod 4 is higher than the top height of the UHPC prefabricated panel 3. The locking rod 4 is slidably provided with a wedge block 5 at one end of the anti-collision wall collision surface template 1, and the locking rod 4 is slidably provided with a block 6 at one end of the anti-collision wall rear template 2. The two ends of the locking rod 4 are threadedly connected with locking nuts 7, so that the wedge block 5 is fit and fixed to the outer side of the anti-collision wall collision surface template 1, and the block 6 is fit and fixed to the outer side of the anti-collision wall rear template 2.

[0022] In this solution, by fitting and fixing the wedge block 5 to the outer side of the anti-collision wall frontal template 1, and the block 6 to the outer side of the anti-collision wall rear template 2, after pouring the concrete, the moisture of the concrete is prevented from leaking from the perforation of the locking rod 4, and the relative distance between the anti-collision wall frontal template 1 and the anti-collision wall rear template 2 is locked by the locking rod 4, ensuring that the anti-collision wall frontal template 1 and the anti-collision wall rear template 2 will not be deformed as the concrete expands when the concrete solidifies. The locking rod 4 is higher than the top height of the UHPC precast panel 3, which ensures the relative distance between the anti-collision wall frontal template 1 and the anti-collision wall rear template 2, and also ensures the complete structure of the UHPC precast panel 3.

[0023] In a further solution, Figure 2 As shown, a bevel pressing plate 8 is fixed to the middle section of the locking rod 4. After the locking rod 4 is fixed, the bevel pressing plate 8 and the anti-collision wall collision surface template 1 press the upper end of the UHPC prefabricated panel 3 against the inner side of the anti-collision wall collision surface template 1. The bevel pressing plate 8 is fixed to the locking rod 4 by welding. After the locking rod 4 is fixed, the bevel pressing plate 8 can clamp the upper end of the UHPC prefabricated panel 3 against the inner side of the anti-collision wall collision surface template 1. The fixing of the bevel pressing plate 8 can prevent the UHPC prefabricated panel 3 from detaching from the inner side of the anti-collision wall collision surface template 1 during concrete pouring and solidification, thereby ensuring the flatness of the anti-collision surface of the anti-collision wall after solidification and ensuring that the UHPC prefabricated panel 3 is embedded in the anti-collision wall collision surface.

[0024] In a further solution, Figure 1 and Figure 2 As shown, the tops of the anti-collision wall front template 1 and the anti-collision wall rear template 2 are respectively fixed with stoppers 9, and the two corresponding stoppers 9 are fixed by a tie rod 10. The tie rod 10 and the stoppers 9 can further enhance the anti-expansion force between the anti-collision wall front template 1 and the anti-collision wall rear template 2, and also prevent the anti-collision wall front template 1 and the anti-collision wall rear template 2 from being skewed.

[0025] In a further solution, a steel cage 11 is provided between the anti-collision wall collision surface template 1 and the anti-collision wall rear template 2, and the steel cage 11 is 2-3 cm away from the UHPC prefabricated panel 3.

[0026] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A UHPC prefabricated formwork structure used for corrosion protection of concrete crash barriers of bridges, comprising a crash wall frontal formwork (1) and a crash wall rear formwork (2), characterized in that: A layer of UHPC prefabricated panels (3) are bonded to both sides of the root turning of the anti-collision wall collision surface template (1), and the UHPC prefabricated panels (3) are integrated with the solidified concrete anti-collision wall.

2. The UHPC prefabricated formwork structure for anti-corrosion of concrete crash walls of bridges according to claim 1 is characterized in that: The invention also comprises a locking rod (4), wherein the locking rod (4) passes through the anti-collision wall collision surface template (1) and the anti-collision wall rear template (2), the height of the locking rod (4) is higher than the top height of the UHPC prefabricated panel (3), the locking rod (4) is slidably provided with a wedge block (5) at one end of the anti-collision wall collision surface template (1), the locking rod (4) is slidably provided with a square block (6) at one end of the anti-collision wall rear template (2), and the two ends of the locking rod (4) are threadedly connected with locking nuts (7), so that the wedge block (5) is fitted and fixed to the outer side of the anti-collision wall collision surface template (1), and the square block (6) is fitted and fixed to the outer side of the anti-collision wall rear template (2).

3. The UHPC prefabricated formwork structure for anti-corrosion of concrete crash walls of bridges according to claim 2 is characterized in that: A slanted pressure plate (8) is fixed to the middle section of the locking rod (4); after the locking rod (4) is fixed, the slanted pressure plate (8) and the anti-collision wall collision surface template (1) press the upper end of the UHPC prefabricated panel (3) against the inner side of the anti-collision wall collision surface template (1).

4. The UHPC prefabricated formwork structure for anti-corrosion of concrete crash walls of bridges according to claim 1 is characterized in that: The top ends of the anti-collision wall frontal template (1) and the anti-collision wall rear template (2) are respectively fixed with stoppers (9), and the two corresponding stoppers (9) are fixed by a pull rod (10).

5. The UHPC prefabricated formwork structure for anti-corrosion of concrete crash walls of bridges according to claim 1 is characterized by: A steel cage (11) is provided between the anti-collision wall collision surface template (1) and the anti-collision wall rear template (2), and the steel cage (11) is 2-3 cm away from the UHPC prefabricated panel (3).

6. The UHPC prefabricated formwork structure for anti-corrosion of concrete crash walls of bridges according to claim 1 is characterized by: The UHPC prefabricated board (3) has a thickness of more than 1.5 cm and a length of between 1 m and 2 m.

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