FRP rib concrete aqueduct body

Abstract

The invention relates to the technical field of hydraulic engineering, and discloses an FRP bar concrete aqueduct body which comprises an upper protection layer, a middle layer and a lower protection layer which are sequentially arranged on a bottom plate from top to bottom in the thickness direction, the upper protection layer and the lower protection layer are poured through common concrete, and the middle layer is poured through high-strength concrete; the two side walls are both made of concrete, are vertically arranged on the bottom plate and are parallel to each other; the plurality of FRP rib meshes are respectively arranged in the upper protective layer, the lower protective layer and the two side walls, the FRP rib meshes in the upper protective layer and the lower protective layer are horizontally arranged, and the FRP rib meshes in the two side walls are vertically arranged; the plurality of prestressed FRP ribs are arranged in the middle layer along the length direction of the aqueduct body; the FRP bar concrete aqueduct body solves the problems that according to an existing aqueduct body, due to corrosion of steel bars, durability of a reinforced concrete aqueduct body is degraded, the ultimate bearing capacity is reduced, the service life is shortened, and even use safety is affected.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to an FRP reinforced concrete aqueduct body. Background Art

[0002] Aqueduct is a kind of water conservancy engineering facility, which is mainly used to transport water from one place to another to meet the needs of irrigation, water supply, flood drainage, diversion, etc. In order to cross obstacles such as ditches, roads, valleys, etc., aqueducts often need to be built in the air.

[0003] The aqueduct body in the prior art is mostly composed of concrete and a steel mesh arranged in the concrete. However, since the steel mesh of the aqueduct body in the prior art is simply arranged in the concrete, its structural strength is limited. Under the action of the deadweight of the aqueduct body and the weight of the water in the aqueduct, cracks are prone to appear on the aqueduct body after long-term use, which in turn affects the structural strength of the aqueduct body. In addition, due to the complex service environment of the aqueduct body, the durability of the reinforced concrete aqueduct body is often degraded and the ultimate bearing capacity is reduced due to steel corrosion, which shortens the service life and even affects the safety of use. Summary of the invention

[0004] The present invention proposes an FRP reinforced concrete aqueduct body to solve the deficiencies in the above-mentioned prior art. The FRP reinforced concrete aqueduct body has high structural strength and can avoid the problems of durability degradation of the concrete body due to corrosion, reduced ultimate bearing capacity, shortened service life and even affecting safety of use.

[0005] The technical solution of the present invention is: an FRP reinforced concrete aqueduct body, comprising:

[0006] The bottom plate comprises an upper protective layer, an intermediate layer and a lower protective layer which are arranged in sequence from top to bottom along the thickness direction, wherein the upper protective layer and the lower protective layer are cast by ordinary concrete, and the intermediate layer is cast by high-strength concrete;

[0007] Two side walls, both made of concrete, are vertically arranged on the bottom plate, and are parallel to each other;

[0008] A plurality of FRP reinforcement meshes are arranged inside the upper protective layer, the lower protective layer and the two side walls respectively, the FRP reinforcement meshes in the upper protective layer and the lower protective layer are arranged horizontally, and the FRP reinforcement meshes in the two side walls are arranged vertically;

[0009] A plurality of prestressed FRP tendons are arranged inside the middle layer along the length direction of the aqueduct body.

[0010] In at least one embodiment of the present invention, supports are provided at both sides of the bottom end of the bottom plate along the length direction of the bottom plate, and FRP prestressed tendons are arranged in the supports along the length direction thereof.

[0011] In at least one embodiment of the present invention, the bottoms of the two side walls on opposite sides are both provided with armpit corners connected to the bottom plate.

[0012] In at least one embodiment of the present invention, a plurality of the prestressed FRP bars are arranged at equal intervals in the middle layer.

[0013] In at least one embodiment of the present invention, the thickness of the side walls and the bottom plate at both ends of the aqueduct in the length direction is 50% to 200% thicker than the thickness of the side walls and the bottom plate in the middle of the aqueduct.

[0014] In at least one embodiment of the present invention, the FRP tendon mesh is formed by orthogonally arranged FRP non-prestressed tendons, and the intersections of the multiple FRP non-prestressed tendons are connected by insulating wires.

[0015] In at least one embodiment of the present invention, a sidewalk slab is extended from the top ends of the two side walls toward the opposite sides of the two side walls, and FRP structural ribs are arranged in the two sidewalk slabs along the length direction of the aqueduct body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention sets the bottom plate as an upper protective layer, an intermediate layer and a lower protective layer which are sequentially arranged from top to bottom along the thickness direction, uses ordinary concrete to cast the upper protective layer and the lower protective layer, and uses high-strength concrete to cast the intermediate layer. With the cooperation of FRP reinforcement mesh and prestressed FRP reinforcement, the structural strength and crack resistance of the trough body are greatly improved, and the occurrence of cracks in the trough body during long-term use is avoided. In addition, the FRP reinforcement is used to replace the traditional reinforcement in the present invention, which can give full play to the superior characteristics of the FRP reinforcement such as high corrosion resistance, solve the problem of easy corrosion of reinforcement, improve the durability of the concrete aqueduct body, ensure the ultimate bearing capacity of the trough body, and prolong the service life of the aqueduct body.

[0018] 2. The present invention provides supports on both sides of the bottom of the base plate and arranges FRP prestressed tendons in the supports, so that the supports can stably support the aqueduct body during the use of the aqueduct, and effectively control the aqueduct body to effectively transfer the deadweight of the aqueduct body and the weight of water in the aqueduct to the lower supporting structure during the construction and use of the aqueduct; and the FRP prestressed tendons with excellent performance are used inside the supports to increase the cracking load, which effectively improves the fatigue resistance and durability of the aqueduct body and meets the use requirements in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the cross-sectional view of the FRP reinforced concrete aqueduct body;

[0020] Figure 2 It is a schematic diagram of the FRP mesh structure;

[0021] Figure 3 A schematic diagram of the cross section of the bottom plate.

[0022] Description of reference numerals:

[0023] 1. Bottom plate; 11. Upper protective layer; 12. Middle layer; 13. Lower protective layer; 2. Side wall; 21. Armpit; 3. FRP reinforcement mesh; 31. FRP non-prestressed reinforcement; 32. Insulation wire; 4. Prestressed FRP reinforcement; 5. Sidewalk slab; 51. FRP structural reinforcement; 6. Support; 61. FRP prestressed reinforcement. DETAILED DESCRIPTION

[0024] The drawings in the present invention are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structures.

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "up", "down", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] The aqueduct body in the prior art is mostly composed of concrete and a steel mesh arranged in the concrete. However, since the steel mesh of the aqueduct body in the prior art is simply arranged in the concrete, its structural strength is limited. Under the action of the deadweight of the aqueduct body and the weight of the water in the aqueduct, cracks will appear on the aqueduct body after long-term use, thereby affecting the structural strength of the aqueduct body. In addition, due to the complex service environment of the aqueduct body, steel bars often rust, resulting in degradation of the durability of the reinforced concrete aqueduct body, reduction of the ultimate bearing capacity, shortening of the service life, and even affecting safety in use.

[0028] FRP bars are composite bars with fiber or fiber fabric as reinforcement and resin as matrix, which have the advantages of light weight, high strength and corrosion resistance. This technology innovatively uses FRP bars to replace steel bars for aqueduct body structures in complex environments, giving full play to the superior corrosion resistance of FRP bars, which can significantly solve the problems of steel bar corrosion and poor durability.

[0029] FRP is a fiber (including carbon fiber, glass fiber, basalt fiber and mixed fiber) reinforced composite material with the characteristics of light weight, high strength, corrosion resistance and designability.

[0030] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an FRP reinforced concrete aqueduct body, in which the steel bars of the aqueduct body are replaced with FRP bars. In addition, the arrangement of the FRP bars on the aqueduct body structure can give full play to the superior corrosion resistance of the FRP bars, thereby solving the problems of corrosion and poor durability of the existing steel bars of the aqueduct body.

[0031] Combination Figures 1 to 3 As shown, a FRP reinforced concrete aqueduct body comprises:

[0032] The trough body is made of concrete, and includes a bottom plate 1 and two side walls 2 vertically arranged on the bottom plate 1. The two side walls 2 are parallel to each other. In order to avoid the problem of rust of the stress reinforcement, the bottom plate 1 is set as an FRP reinforced concrete plate. In order to avoid the problem of rust of the stress reinforcement, the two side walls 2 are both FRP reinforced concrete side walls.

[0033] A plurality of FRP reinforcement meshes 3 are arranged inside the bottom plate 1 and the two side walls 2, respectively. The FRP reinforcement meshes 3 inside the bottom plate 1 are arranged horizontally, and the FRP reinforcement meshes 3 inside the two side walls 2 are arranged vertically. The FRP reinforcement meshes 3 can avoid the rust problem like the steel meshes, which further leads to the problem of low structural strength of the aqueduct body.

[0034] A plurality of prestressed FRP tendons 4 are arranged in the bottom plate 1 along the length direction of the aqueduct body; the prestressed FRP tendons 4 are used to limit the width of cracks distributed along the width direction of the aqueduct body.

[0035] As an alternative embodiment, the base plate 1 includes: an upper protective layer 11, an intermediate layer 12 and a lower protective layer 13 from top to bottom along the thickness direction, the upper protective layer 11 and the lower protective layer 13 are cast with ordinary concrete, the intermediate layer 12 is cast with high-strength concrete, and FRP tendon meshes 3 are horizontally arranged in the upper protective layer 11 and the lower protective layer 13. The FRP tendon meshes 3 arranged in the upper protective layer 11 and the lower protective layer 13 are used to bear the deadweight of the aqueduct body and the weight of water in the trough. A plurality of prestressed FRP tendons 4 are arranged in the intermediate layer 12 along the length direction of the aqueduct body; specifically, the upper protective layer 11 and the lower protective layer 13 are made of ordinary concrete, which effectively saves construction costs, and the intermediate layer 12 adds prestressed FRP tendons 4 to improve the crack resistance and impact resistance of the base plate 1, thereby further improving the durability of the base plate 1.

[0036] As an alternative embodiment, the FRP tendon mesh 3 is formed by a plurality of FRP non-prestressed tendons 31 arranged orthogonally, and the intersections of the plurality of FRP non-prestressed tendons 31 are connected by insulating wires 32 to prevent dislocation during construction. The FRP tendon mesh 3 is formed by orthogonally arranging the FRP non-prestressed tendons 31, which works together with the concrete and prestressed FRP tendons to improve the bearing capacity of the trough structure, effectively control the appearance or development of cracks in the trough, and further improve the bending performance of the trough section.

[0037] As an alternative embodiment, a sidewalk slab 5 is extended along the top of the two side walls 2 toward the opposite side of the two side walls 2. The sidewalk slab 5 is provided to facilitate the maintenance of the aqueduct body by the staff. FRP structural ribs 51 are provided inside the two sidewalk slabs 5 along the length direction of the aqueduct body. The FRP structural ribs 51 are used to bear the load of people etc. The sidewalk slab 5 is located above the aqueduct body, providing a safe passage platform for construction and maintenance personnel, so that they can carry out necessary inspection and maintenance work on the aqueduct body. Its internal structural ribs 51 are used to prevent cracks from occurring at the junction of the sidewalk slab 5 and the side wall 2 due to concrete shrinkage and temperature changes, while ensuring the normal operation of the stress-bearing steel bars.

[0038] As an alternative embodiment, supports 6 are provided at both sides of the bottom end of the bottom plate 1 along the length direction of the bottom plate 1, and FRP prestressed tendons 61 are arranged inside the supports 6 along the length direction thereof. The supports 6 are used to support the aqueduct body, ensure the stable operation of the aqueduct body, and effectively control the aqueduct body to effectively transfer the deadweight of the body and the weight of water in the aqueduct to the lower supporting structure during construction and use. The FRP prestressed tendons 61 with excellent performance are used inside to increase the cracking load, which effectively improves the fatigue resistance and durability of the aqueduct body and meets the use requirements in harsh environments.

[0039] As an alternative embodiment, the bottoms of the two side walls 2 on opposite sides are provided with armpit corners 21 connected to the bottom plate 1. The armpit corners 21 are used to strengthen the connection between the bottom plate 1 and the side walls 2, increase the stability and earthquake resistance of the trough structure, and ensure the service life of the trough.

[0040] As an alternative embodiment, the thickness of the side walls 2 and the bottom plate 1 at both ends of the length direction of the aqueduct body is 50% to 200% thicker than the thickness of the side walls 2 and the bottom plate 1 in the middle of the aqueduct body. Specifically, the thickness of the side walls 2 and the bottom plate 1 at both ends of the length direction of the aqueduct body is 150% thicker than the thickness of the side walls 2 and the bottom plate 1 of the aqueduct body. This thickened setting can ensure the stability of the supporting parts of the aqueduct body and at the same time reduce the deadweight of the aqueduct body, thereby ensuring the structural strength and structural stability of the aqueduct body.

[0041] The above embodiments are only specific implementation methods of the patent of the present invention, which are used to illustrate the technical solution of the patent of the present invention rather than to limit it. The protection scope of the patent of the present invention is not limited thereto. Although the patent of the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution for implementing the patent of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. An FRP reinforced concrete aqueduct body, characterized in that: include: The bottom plate (1) comprises an upper protective layer (11), an intermediate layer (12) and a lower protective layer (13) which are arranged in sequence from top to bottom along a thickness direction, wherein the upper protective layer (11) and the lower protective layer (13) are cast using ordinary concrete, and the intermediate layer (12) is cast using high-strength concrete; Two side walls (2), both of which are made of concrete, are vertically arranged on the bottom plate (1), and are parallel to each other; A plurality of FRP reinforcement mesh sheets (3) are arranged inside the upper protective layer (11), the lower protective layer (13) and the two side walls (2), respectively; the FRP reinforcement mesh sheets (3) inside the upper protective layer (11) and the lower protective layer (13) are arranged horizontally, and the FRP reinforcement mesh sheets (3) inside the two side walls (2) are arranged vertically; A plurality of prestressed FRP tendons (4) are arranged inside the middle layer (12) along the length direction of the aqueduct body.

2. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: Supports (6) are provided on both sides of the bottom end of the lower protective layer (13) along the length direction of the aqueduct body, and FRP prestressed tendons (61) are arranged inside the support (6) along the length direction thereof.

3. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: The bottoms of the two side walls (2) on opposite sides are each provided with an armpit (21) connected to the upper protective layer (11).

4. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: A plurality of the prestressed FRP tendons (4) are arranged at equal intervals in the middle layer (12).

5. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: The thickness of the side walls (2) and the bottom plate (1) at both ends of the aqueduct in the length direction is 50% to 200% thicker than the thickness of the side walls (2) and the bottom plate (1) at the middle of the aqueduct.

6. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: The FRP tendon mesh (3) is formed by orthogonally arranging a plurality of FRP non-prestressed tendons (31), and the intersections of the plurality of FRP non-prestressed tendons (31) are connected by insulating binding wires (32).

7. The FRP reinforced concrete aqueduct body according to claim 1, characterized in that: A sidewalk slab (5) is extended along the top ends of the two side walls (2) toward the opposite side of the two side walls (2), and FRP structural ribs (51) are arranged inside the two sidewalk slabs (5) along the length direction of the aqueduct body.

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