CN112627011A

CN112627011A - FRP cable arch structure after optimizing

Info

Publication number: CN112627011A
Application number: CN202011582454.6A
Authority: CN
Inventors: 丁一; 杨华侨; 李博言; 黄宇刚
Original assignee: Central Research Institute of Building and Construction Co Ltd MCC Group; China Jingye Engineering Corp Ltd
Current assignee: Central Research Institute of Building and Construction Co Ltd MCC Group; China Jingye Engineering Corp Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-09

Abstract

The invention discloses an optimized FRP cable arch structure, wherein two ends of an FRP curved arch pipe are connected with a foundation body through arch springing anchoring systems; seawater sea sand recycled concrete is filled in the FRP arch tube; the FRP prestressed inhaul cable is connected between the foundation bodies; the FRP supporting tubes are uniformly distributed between the FRP curved arch tube and the FRP prestressed inhaul cable; seawater sea sand recycled concrete is filled in the FRP supporting pipe; one end of the FRP support pipe is connected with the FRP prestress stay cable through a stay cable connecting system, and the other end of the FRP support pipe is connected with the FRP camber pipe through a support connecting system. The invention better solves the connection between brittle and unweldable components by adopting the arch foot anchoring system and the supporting connection system, and ensures that the node has certain rotation ductility, relieves local stress concentration and reduces or avoids brittle failure of the node.

Description

FRP cable arch structure after optimizing

Technical Field

The invention relates to the technical field of civil engineering, in particular to an optimized FRP cable arch structure.

Background

The arch bridge is one of the traditional bridge types, has the advantages of strong spanning capability, simple structure, definite stress, attractive appearance and the like, and is favored by the engineering industry all the time. However, the arch bridge also has its own defects, such as large dead weight, high requirement for foundation conditions, complex construction procedures, etc.

With the development of design and construction technology, the materials of the arch serving as the main stressed members of the arch bridge are improved on the basis of the traditional masonry arch bridge, and a plurality of new arch forms emerge, such as a steel arch bridge, a reinforced concrete arch bridge, a steel pipe concrete combined arch bridge, a steel reinforced concrete combined arch bridge and the like, so that the spanning capability and the terrain adaptability of the arch bridge are further improved.

The FRP material has the characteristics of light dead weight, high strength, good durability and good machinability, is widely applied to various fields of civil engineering in recent 20 years, particularly in the field of ocean engineering, the FRP has high corrosion resistance so that the FRP is favored, and the application of composite products such as FRP pipes, FRP ribs and the like in the ocean engineering becomes a hotspot of research and application.

The FRP pipe concrete combined embedded arch bridge is a through structure, and its main stress member is FRP pipe concrete arch, and is formed from core concrete and FRP pipe wrapped outside. The FRP pipe wall enables concrete to be in a three-dimensional compression state under the constraint action of filling concrete in the FRP pipe wall, longitudinal cracking of the concrete under compression is reduced, the compressive strength is improved, the internal concrete can effectively prevent the FRP pipe from local buckling, the geometric stability of the FRP pipe is enhanced, and the overall rigidity is improved. The FRP pipe concrete arch takes compression as a main part, the advantages of two materials can be fully exerted, and the defects are avoided, so that the bearing capacity of the combined arch is far greater than the sum of the bearing capacity of core concrete and the bearing capacity of the externally wrapped FRP pipe which form the arch, and the spanning capacity of the bridge is improved. In ocean engineering, the seawater sea sand recycled concrete is used for replacing common concrete, so that local materials can be obtained, the material cost is saved, and the like, and the FRP curved pipe is used for restraining the seawater sea sand recycled concrete to have a great application value in ocean engineering.

In order to further improve the spanning capability and the terrain adaptability of the arch bridge, FRP prestressed guys are adopted to pull the two ends of the arch body, and FRP stay bar supports are arranged between the guys and the arch body.

Under the action of vertical load, the FRP curved pipe restricts the seawater sea sand recycled concrete combined embedded arch bridge, the curved arch is mainly pressed, the arch foot part not only generates vertical counter force, but also generates horizontal thrust, and therefore the connection part of the curved arch and the foundation is the key point of stress. On the other hand, the connection between the FRP brace and the arch is also a key problem, and in the existing structure, the FRP brace and the FRP pipe of the arch are mostly bonded or rigidly connected, so that the FRP brace and the FRP pipe of the arch are easy to fall off or are too rigid to limit the rotation of the node, and are easy to damage due to stress concentration under stress.

Therefore, how to provide an FRP cable arch structure for preventing damage to meet the needs of section beams under different conditions is a problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a solution to the above technical problem.

In order to achieve the purpose, the invention adopts the following technical scheme:

an optimized FRP cable arch structure comprising:

FRP curved arch pipes; two ends of the FRP curved arch pipe are connected with the foundation body through arch springing anchoring systems; seawater sea sand recycled concrete is filled in the FRP arch tube;

FRP prestressed guy cables; the FRP prestressed inhaul cable is connected between the foundation bodies and is positioned below the FRP arch pipe;

an FRP support tube; the FRP support pipes are distributed among the FRP curved arch pipes and the FRP prestressed inhaul cables uniformly; seawater sea sand recycled concrete is filled in the FRP supporting pipe; one end of the FRP support pipe is connected with the FRP prestress stay cable through a stay cable connecting system, and the other end of the FRP support pipe is connected with the FRP arch camber pipe through a support connecting system.

Through the technical scheme, the connection between brittle and unweldable components is better solved by adopting the arch foot anchoring system and the supporting and connecting system, the node has certain rotation ductility, the local stress concentration is relieved, and the brittle failure of the node is reduced or avoided.

Preferably, in the above optimized FRP cable arch structure, the arch foot anchoring system includes: the FRP frame comprises a first FRP rib, a first FRP stirrup, an FRP plate and an FRP bolt; the number of the first FRP ribs is multiple, the first FRP ribs are arranged in parallel, one part of the first FRP ribs is inserted into the seawater sea sand recycled concrete in the FRP curved arch pipe, and the other part of the first FRP ribs is inserted into the foundation body; the first FRP hooping is hooped outside the first FRP ribs in a surrounding manner; the FRP plates are arranged in a plurality of numbers and are fixed in the foundation body in parallel, and the first FRP ribs penetrate through the FRP plates and are arranged vertically to the FRP plates; the FRP bolt is in threaded fastening connection with the end of the first FRP rib, and is tightly propped against the outer side of the FRP plate close to the end of the first FRP rib. The first FRP ribs extend into the end part of the foundation body, a plurality of FRP plates are arranged to increase the connection between the FRP curved arch pipe and the foundation body, and the FRP plate on the outermost side is provided with a limiting FRP bolt to prevent the first FRP ribs from being pulled out of the FRP plates; the anchoring performance of the FRP curved arch pipe and the foundation body is enhanced, various internal forces at the arch springing can be effectively resisted, and the connection performance of the FRP curved arch pipe and the foundation body is improved.

Preferably, in the above optimized FRP cable arch structure, a plurality of first cushion blocks are padded between the inner wall of the FRP arch pipe and the first FRP ribs. The thickness of the concrete protective layer in the FRP curved arch pipe can be ensured, and the first FRP rib is prevented from directly contacting the FRP curved arch pipe.

Preferably, in the above optimized FRP cable arch structure, the number of the FRP plates is two. With a reasonable number of arrangements, the stability of the structure can be improved and material saving is facilitated.

Preferably, in the above optimized FRP cable arch structure, a part of the first FRP stirrup is located inside the FRP arch tube, and another part of the first FRP stirrup is located inside the foundation body. The structural stability of first FRP rib can further be improved.

Preferably, in the above optimized FRP cable arch structure, the supporting and connecting system includes a second FRP rib and a second FRP stirrup; the number of the second FRP ribs is multiple, the second FRP ribs are arranged in parallel, one part of the second FRP ribs is inserted into the seawater sea sand recycled concrete in the FRP support pipe, and the other part of the second FRP ribs is inserted into the FRP curved arch pipe; the second FRP stirrups are hooped and hooped outside the second FRP ribs, one part of the second FRP stirrups is located inside the FRP supporting pipe, and the other part of the second FRP stirrups is located inside the FRP curved arch pipe. The second FRP rib stretches into the end part of the FRP curved arch pipe, and the connection performance of the FRP curved arch pipe and the FRP supporting pipe is enhanced, so that the node has certain rotation ductility, the local stress concentration is relieved, and the brittle failure of the node is reduced or avoided.

Preferably, in the above optimized FRP cable arch structure, a plurality of second cushion blocks are padded between the inner wall of the FRP supporting pipe and the second FRP ribs. The thickness of the concrete protective layer in the FRP curved arch pipe can be ensured, and the first FRP rib is prevented from directly contacting the FRP curved arch pipe.

Preferably, in the above optimized FRP cable arch structure, a plurality of the first FRP ribs and a plurality of the second FRP ribs are all arranged in a surrounding manner, so as to form a structure with a circular cross section. The structural stability of first FRP rib has been strengthened.

Preferably, in the optimized FRP cable arch structure, the cable connection system includes a steel sleeve fixed radially inside the FRP support tube, and both ends of the steel sleeve penetrate through the outside of the FRP support tube; the FRP prestress stay cable is arranged in the steel sleeve in a penetrating mode and is connected with the inner wall of the steel sleeve through bonding glue. Can improve the stability of being connected with FRP prestressing force cable.

Preferably, in the above optimized FRP cable arch structure, the FRP arch tube and the FRP support tube have circular or rectangular cross sections. The application range can be enlarged.

Preferably, in the above optimized FRP cable arch structure, the foundation body is recycled concrete from sea water and sea sand. The seawater sea sand recycled concrete is used for replacing common concrete, so that local materials can be obtained, the material cost is saved, other concrete capable of meeting the use requirement can be used, and the method is not limited.

Preferably, in the above optimized FRP cable arch structure, both the first FRP stirrup and the second FRP stirrup are of a spiral structure. Can well play the stirrup role.

Preferably, in the above optimized FRP cable arch structure, two ends of the FRP prestressed cable are connected to the fixing plate fixed in the foundation body through FRP bolts.

According to the technical scheme, compared with the prior art, the optimized FRP cable arch structure disclosed by the invention has the advantages that the connection among fragile and unweldable components is better solved by adopting the arch foot anchoring system and the supporting and connecting system, the node has certain rotation ductility, the local stress concentration is relieved, and the fragile damage of the node is reduced or avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of an optimized FRP cable arch structure provided by the invention;

FIG. 2 is a schematic view of the arch foot anchoring system provided by the present invention;

FIG. 3 is a schematic view of a support connection system provided by the present invention;

fig. 4 is a schematic view of a cable connection system provided by the present invention.

Wherein:

1-FRP curved arch pipe;

2-FRP support tubes;

3-FRP prestressed guy cable;

4-an arch foot anchoring system;

41-first FRP ribs;

42-first FRP stirrup;

43-a first head block;

44-FRP plate;

45-FRP suppositories;

5-a support connection system;

51-second FRP ribs;

52-second FRP stirrup;

53-a second head block;

6-a cable connection system;

61-a steel sleeve;

62-adhesive glue;

7-basic ontology.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, an embodiment of the present invention discloses an optimized FRP cable arch structure, including:

FRP curved arch pipe 1; two ends of the FRP curved arch pipe 1 are connected with a foundation body 7 through arch springing anchoring systems 4; seawater and sea sand recycled concrete is filled in the FRP curved arch pipe 1;

an FRP prestressed stay cable 3; the FRP prestressed inhaul cable 3 is connected between the foundation bodies 7 and is positioned below the FRP curved arch pipe 1;

an FRP support tube 2; the number of the FRP support pipes 2 is multiple, and the FRP support pipes are uniformly distributed between the FRP curved arch pipe 1 and the FRP prestressed inhaul cable 3; seawater sea sand recycled concrete is filled in the FRP supporting tube 2; one end of the FRP support pipe 2 is connected with the FRP prestress stay cable 3 through a stay cable connecting system 6, and the other end of the FRP support pipe is connected with the FRP curved arch pipe 1 through a support connecting system 5.

In order to further optimize the above solution, the arch foot anchoring system 4 comprises: the first FRP rib 41, the first FRP stirrup 42, the FRP plate 44 and the FRP bolt 45; the number of the first FRP ribs 41 is multiple, the multiple first FRP ribs 41 are arranged in parallel, one part of the first FRP ribs is inserted into the seawater sea sand recycled concrete in the FRP curved arch pipe 1, and the other part of the first FRP ribs is inserted into the foundation body 7; the first FRP stirrups 42 are hooped outside the first FRP ribs 41 in a surrounding manner; the FRP plates 44 are arranged in a plurality of numbers and are fixed in the base body 7 in parallel, and the first FRP ribs 41 penetrate through the FRP plates 44 and are arranged vertically to the FRP plates; the FRP bolt 45 is fastened and connected to the end of the first FRP rib 41 by a screw thread, and is tightly pressed against the outer side of the FRP plate 44 near the end of the first FRP rib 41.

In order to further optimize the technical scheme, a plurality of first cushion blocks 43 are padded between the inner wall of the FRP curved arch pipe 1 and the first FRP ribs 41.

In order to further optimize the technical scheme, one part of the first FRP stirrup 42 is positioned inside the FRP arch pipe 1, and the other part is positioned inside the base body 7.

In order to further optimize the above technical solution, the supporting and connecting system 5 includes a second FRP rib 51 and a second FRP stirrup 52; the number of the second FRP ribs 51 is multiple, the second FRP ribs 51 are arranged in parallel, one part of the second FRP ribs 51 is inserted into the seawater sea sand recycled concrete in the FRP support pipe 2, and the other part of the second FRP ribs 51 is inserted into the FRP curved arch pipe 1; the second FRP stirrups 52 are hooped outside the plurality of second FRP ribs 51, and a part of the second FRP stirrups 52 is located inside the FRP support pipe 2, and another part is located inside the FRP arch pipe 1.

In order to further optimize the above technical solution, a plurality of second cushion blocks 53 are padded between the inner wall of the FRP support tube 2 and the second FRP ribs 51.

In order to further optimize the above technical solution, the plurality of first FRP ribs 41 and the plurality of second FRP ribs 51 are all arranged around to form a structure with a circular cross section; the first FRP stirrup 42 and the second FRP stirrup 43 are both helical structures.

In order to further optimize the technical scheme, the inhaul cable connecting system comprises a steel sleeve 61 radially fixed inside the FRP support pipe 2, and two ends of the steel sleeve 61 penetrate through the outside of the FRP support pipe 2; the FRP prestressed inhaul cable 3 is arranged in the steel sleeve 61 in a penetrating mode and is connected with the inner wall of the steel sleeve 61 through bonding glue.

In order to further optimize the technical scheme, the cross sections of the FRP curved arch pipe 1 and the FRP support pipe 2 are circular or rectangular.

In order to further optimize the technical scheme, the foundation body 7 is seawater sea sand recycled concrete.

The structural connection principle of the invention is as follows:

the optimized arch foot anchoring system 4 connects the arch foot of the FRP curved arch pipe 1 with the base body 7 through the first FRP ribs 41 and the first FRP stirrups 42, the end parts of which are provided with a plurality of FRP plates 44, so that the anchoring performance of the FRP curved arch pipe 1 and the base body 7 is enhanced, various internal forces at the arch foot can be effectively resisted, and the connection performance of the arch foot and the base body is improved; according to the optimized support connection system, the FRP support tube 2 and the FRP curved arch tube 1 are connected through the second FRP ribs 51 and the second FRP stirrups 52, so that the connection performance of the FRP support tube 2 and the FRP curved arch tube 1 is enhanced, the node has proper rotation ductility, local stress concentration is released, and the node damage is reduced or avoided.

The FRP curved arch pipe 1, the FRP support pipe 2, the FRP prestress guy cable 3, the FRP ribs, the FRP stirrups, the cushion blocks and the like can be prefabricated and assembled in a factory or on site, and are directly installed during use, so that the construction period is shortened.

The embodiment is flexible and changeable, and is suitable for combined curved arches in various shapes such as circles, squares and the like.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An FRP cable arch structure after optimizing, characterized by includes:

FRP curved arch pipes (1); two ends of the FRP curved arch pipe (1) are connected with a foundation body (7) through arch springing anchoring systems (4); seawater and sea sand recycled concrete is filled in the FRP curved arch pipe (1);

an FRP prestressed stay (3); the FRP prestressed inhaul cable (3) is connected between the foundation bodies (7) and is positioned below the FRP curved arch pipe (1);

an FRP support tube (2); the number of the FRP support pipes (2) is multiple, and the FRP support pipes are uniformly distributed between the FRP curved arch pipe (1) and the FRP prestressed inhaul cable (3); seawater and sea sand recycled concrete is filled in the FRP supporting pipe (2); one end of the FRP support pipe (2) is connected with the FRP prestress stay cable (3) through a stay cable connecting system (6), and the other end of the FRP prestress stay cable is connected with the FRP curved arch pipe (1) through a support connecting system (5).

2. An optimized FRP cable arch structure, as claimed in claim 1, wherein said arch foot anchoring system (4) comprises: the FRP reinforcing plate comprises a first FRP rib (41), a first FRP hoop (42), an FRP plate (44) and an FRP bolt (45); the number of the first FRP ribs (41) is multiple, the first FRP ribs (41) are arranged in parallel, one part of the first FRP ribs is inserted into the seawater sea sand recycled concrete in the FRP curved arch pipe (1), and the other part of the first FRP ribs is inserted into the foundation body (7); the first FRP hooping (42) is hooped and hooped outside the first FRP ribs (41); the FRP plates (44) are multiple and are fixed inside the base body (7) in parallel, and the first FRP ribs (41) penetrate through the FRP plates (44) and are arranged vertically to the FRP plates; the FRP bolt (45) is in threaded fastening connection with the end of the first FRP rib (41) and is tightly propped against the outer side of the FRP plate (44) close to the end of the first FRP rib (41).

3. An optimized FRP cable arch structure as claimed in claim 2, wherein a plurality of first cushion blocks (43) are arranged between the inner wall of the FRP arch pipe (1) and the first FRP ribs (41).

4. An optimized FRP cable-arch structure according to claim 2 or 3, wherein the first FRP stirrup (42) is partially located inside the FRP curved arch tube (1) and partially located inside the foundation body (7).

5. An optimized FRP cable arch structure, according to claim 4, wherein said supporting and connecting system (5) comprises a second FRP rib (51) and a second FRP stirrup (52); the number of the second FRP ribs (51) is multiple, the second FRP ribs (51) are arranged in parallel, one part of the second FRP ribs is inserted into the seawater sea sand recycled concrete in the FRP support pipe (2), and the other part of the second FRP ribs is inserted into the FRP curved arch pipe (1); the second FRP stirrups (52) are hooped outside the second FRP ribs (51) in a surrounding manner, one part of the second FRP stirrups (52) is located inside the FRP support pipe (2), and the other part of the second FRP stirrups (52) is located inside the FRP curved arch pipe (1).

6. An optimized FRP cable arch structure as claimed in claim 5, wherein a plurality of second cushion blocks (53) are padded between the inner wall of the FRP support pipe (2) and the second FRP ribs (51).

7. An optimized FRP cable arch structure as claimed in claim 6, wherein a plurality of said first FRP ribs (41) and a plurality of said second FRP ribs (51) are arranged around each other to form a structure with a circular cross section; the first FRP hoop (42) and the second FRP hoop (43) are both of a spiral structure.

8. An optimized FRP cable arch structure as claimed in claim 1, wherein the cable connection system comprises a steel sleeve (61) fixed radially inside the FRP support pipe (2), and both ends of the steel sleeve (61) penetrate out of the FRP support pipe (2); the FRP prestress guy cable (3) is arranged in the steel sleeve (61) in a penetrating mode and is connected with the inner wall of the steel sleeve (61) through bonding glue.

9. An optimized FRP cable arch structure as claimed in claim 1, wherein the FRP arch tube (1) and the FRP support tube (2) have a circular or rectangular cross section.

10. An optimized FRP cable arch structure according to claim 1, wherein the foundation body (7) is recycled concrete from sea water and sea sand.