CN114991385A

CN114991385A - Full FRP pipe seawater sea sand concrete beam and construction method thereof

Info

Publication number: CN114991385A
Application number: CN202210516405.5A
Authority: CN
Inventors: 曾岚; 刘祖瑞; 陆华强; 李柏钦; 莫子永; 凌雪仪; 李国铿; 范军委; 袁鸿; 黄世清
Original assignee: Jinan University
Current assignee: Jinan University
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-09-02

Abstract

The invention discloses a full FRP pipe seawater sea sand concrete beam which comprises an outer layer FRP pipe, a plurality of groups of first FRP pipes, a plurality of groups of second FRP pipes and seawater sea sand concrete; the outer-layer FRP pipe is a U-shaped groove, a plurality of groups of first FRP pipes are arranged at the upper part of the inner side of the outer-layer FRP pipe, the fiber direction is annular, seawater and sea sand concrete is filled in the pipe, and the second FRP pipe is positioned at the lower part of the inner side of the outer-layer FRP pipe; the seawater sea sand concrete is filled in the outer layer FRP pipe. The outer-layer FRP pipes are used for powerfully restraining the bottom surface and the side surface of the beam, the development of inclined cracks is delayed, the shearing resistance of the beam is greatly improved, a plurality of groups of first FRP pipes are used for restraining concrete in a stressed area of the beam, a stress mechanism provides a safety early warning for structural failure, and the limiting compressive strain and the deformation resisting capacity of the concrete in the stressed area are improved due to the restraining effect of the first FRP pipes; the development of vertical cracks in the tension area is delayed, and the bending resistance of the concrete is enhanced.

Description

Full FRP pipe seawater sea sand concrete beam and construction method thereof

Technical Field

The invention relates to the technical field of construction and experiments of constructional engineering, in particular to a full FRP pipe seawater sea sand concrete beam and a construction method thereof.

Background

In recent years, the seawater and sea sand resource with abundant reserves as a substitute resource of fresh water river sand is always a hot topic of new materials and new structures on infrastructure construction, but if a large amount of chloride ions in the seawater and sea sand are directly used in a concrete structure without treatment, premature corrosion of reinforcing steel bars can be caused, and the safety and the service life of the structure are seriously influenced. In order to remove impurities such as chloride ions in seawater and sea sand, special equipment is needed for desalination treatment, so that a large amount of fresh water resources are consumed while the use cost is increased. Therefore, if the sea sand can be used as building water to replace the traditional river sand and seawater, a building structural member which can resist the corrosion of the seawater and the sea sand and meets the use requirement is prepared, great economic benefits are generated, and the sustainable utilization of river sand resources can be realized.

As a new building material, a Fiber Reinforced Polymer (FRP) has the advantages of strong corrosion resistance, light weight, high strength, excellent designability, high stability and the like. Therefore, the FRP material with excellent mechanical property replaces steel bars to be applied to construction of coastal/ocean infrastructures, the durability of the structure can be improved, and abundant seawater and sea sand resources can be utilized.

Therefore, the method for exploring and researching the corrosion resistance, durability, resource saving and capability of effectively improving the bending resistance and the shearing resistance of the FRP seawater sea sand concrete beam member has obvious engineering value and research significance.

Disclosure of Invention

The invention aims to provide a full FRP pipe seawater sea sand concrete beam and a construction method thereof, which aim to solve the problems in the prior art, and improve the bending resistance and the shearing resistance of an FRP seawater sea sand concrete beam component by utilizing abundant seawater sea sand resources to replace the traditional fresh water river sand resources.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a full FRP pipe seawater sea sand concrete beam which comprises outer layer FRP pipes, a plurality of groups of first FRP pipes, a plurality of groups of second FRP pipes and seawater sea sand concrete; the cross section of the outer-layer FRP pipe is U-shaped, a plurality of groups of first FRP pipes are arranged at the upper part of the inner side of the outer-layer FRP pipe, a plurality of groups of second FRP pipes are positioned at the lower part of the inner side of the outer-layer FRP pipe, and a plurality of groups of first FRP pipes correspond to the second FRP pipes; the seawater sea sand concrete is filled in the outer-layer FRP pipe; the plurality of groups of first FRP pipes are filled with seawater sea sand concrete.

Preferably, the outer-layer FRP pipe is of an integrated structure, and the bottom of the outer-layer FRP pipe is open.

Preferably, the outer-layer FRP pipe and the first FRP pipe are both made of wound fiber reinforced plastic, and the second FRP pipe is made of pultruded fiber reinforced plastic.

Preferably, the number of the first FRP pipes and the second FRP pipes is not less than one.

Preferably, the first FRP pipe and the second FRP pipe are both arranged along a long side direction of the outer-layer FRP pipe.

Preferably, the components of the seawater and sea sand concrete comprise cement, seawater, sea sand and broken stones.

Preferably, a plurality of groups of third FRP pipes are detachably connected inside each group of the first FRP pipes, each group of the third FRP pipes is arranged in parallel with the inner wall of the first FRP pipe, and the cross-sectional area of each group of the third FRP pipes is smaller than that of the first FRP pipes.

Preferably, the cross section of the first FRP pipe and the cross section of the third FRP pipe are both circular, and the cross section of the second FRP pipe is circular or rectangular.

Preferably, the interiors of the plurality of groups of second FRP pipes are of a hollow structure, and reinforcing steel bars or steel pipes are detachably connected to the interiors of the second FRP pipes; the cross sectional area of the steel bar or the steel pipe is matched with the cross sectional area of the interior of the second FRP pipe.

A construction method of a full FRP pipe seawater sea sand concrete beam,

(1) the inner surfaces and the outer surfaces of the outer-layer FRP pipes, the first FRP pipes and the second FRP pipes are all processed by sanding or adding shearing connectors;

(2) pouring seawater sea sand concrete inside the first FRP pipe;

(3) the first FRP pipe is used as a side template, a bottom template and two end templates of the seawater sea sand concrete beam, and the second FRP pipe is connected with the poured first FRP pipe through reserved holes of the two end templates;

(4) and pouring seawater sea sand concrete from the opening at the top of the outer-layer FRP pipe until the top is sealed.

The invention discloses the following technical effects:

1. compared with the conventional FRP concrete beam, the outer-layer FRP pipe provided by the invention has the advantages that the bottom surface and the side surface of the beam are strongly restrained, the development of inclined cracks is delayed, and the shearing resistance of the beam is greatly improved.

2. Compared with the conventional FRP concrete beam, the invention has the advantages that the concrete in the beam compression area is powerfully restrained by adopting a plurality of groups of first FRP pipes, the stress mechanism provides safety early warning for structural failure, and the safety reserve is increased. In addition, the limiting effect of the first FRP pipe greatly improves the ultimate compressive strain and the deformation resistance of concrete in the compression area, and the bending resistance of the concrete beam is effectively enhanced.

3. The second FRP pipe composite can effectively improve the tensile capacity of the tension area, delay the development of vertical cracks of the tension area and effectively enhance the bending resistance of the beam.

4. The seawater sea sand concrete beam is a full FRP framework component, can give full play to the characteristics of lightweight, high strength and corrosion resistance of FRP, solves the risk of corrosion of steel bars of the traditional concrete structure, improves the durability of the beam, and has more remarkable effect when being used for coastal engineering or island and reef engineering; meanwhile, because the concrete beam does not adopt steel, the non-conductivity and non-magnetism of the FRP pipe are also suitable for buildings with special functional requirements such as anti-electromagnetic interference and the like.

5. The invention adopts the seawater and sea sand which are environment-friendly and abundant in reserves to replace the traditional fresh water river sand as the raw material of the concrete, is especially suitable for coastal engineering, is convenient for local material taking, has low manufacturing cost, can greatly relieve the problem that fresh water and river sand resources are in increasing shortage, is green, economical and environment-friendly, and realizes the sustainable resource utilization of infrastructure construction.

6. In the construction, no steel bar binding operation is performed, the components can be prefabricated, and the prefabricated connecting sleeves are adopted for connection on site, so that the construction is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a three-dimensional view of a first embodiment of the present invention;

FIG. 3 is a three-dimensional view of a second embodiment of the present invention;

FIG. 4 is a schematic diagram of a third embodiment of the present invention;

FIG. 5 is a three-dimensional view of a third embodiment of the present invention;

FIG. 6 is a diagram illustrating a fourth embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a layout according to a fourth embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another layout according to a fourth embodiment of the present invention;

FIG. 9 is a schematic view of the connection of the small diameter circular tubes according to the present invention;

FIG. 10 is a schematic view of the connection of the large diameter circular tubes of the present invention;

FIG. 11 is a schematic view of the connection of a two-way U-shaped tube according to the present invention;

FIG. 12 is a side view showing a connection mode of the bidirectional U-shaped pipe according to the present invention;

FIG. 13 is a schematic view of the lapping manner of the one-way U-shaped tube according to the present invention;

FIG. 14 is a schematic view of a rectangular tube connection according to the present invention;

FIG. 15 is a schematic view of the overall connection mode of the seawater sea sand concrete beam according to the present invention.

Wherein: 1. a first FRP tube; 2. a second FRP tube; 3. a steel pipe; 4. an outer layer FRP pipe; 5. seawater sea sand concrete; 6. a third FRP tube.

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.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.

The first embodiment is as follows:

referring to fig. 1-2, the embodiment provides a full FRP pipe seawater sea sand concrete beam, which includes an outer layer FRP pipe 4, a group of first FRP pipes 1, three groups of second FRP pipes 2, and seawater sea sand concrete 5; the outer-layer FRP pipe 4 is groove-shaped, the first FRP pipe 1 is arranged at the upper part of the inner side of the outer-layer FRP pipe 4, the three groups of second FRP pipes 2 are all positioned at the lower part of the inner side of the outer-layer FRP pipe 4, and the group of first FRP pipes 1 corresponds to the three groups of second FRP pipes 2; the seawater sea sand concrete 5 is filled in the outer layer FRP pipe 4. The outer-layer FRP pipe 4 is of an integrated structure, the cross section of the outer-layer FRP pipe 4 is U-shaped, and the bottom of the outer-layer FRP pipe 4 is open; the outer FRP pipe 4 wraps the side and the bottom of the seawater sea sand concrete beam. Outer FRP pipe 4 all adopts winding forming's glass fiber reinforced plastic with first FRP pipe 1, and second FRP pipe 2 adopts pultrusion's glass fiber reinforced plastic, and above-mentioned two kinds and fibre winding direction are the hoop or are close the hoop, also can adopt carbon-fibre composite etc.. The first FRP pipe 1 is filled with seawater sea sand concrete 5. The interior of the three groups of second FRP pipes 2 is of a hollow structure, and the first FRP pipes 1 and the second FRP pipes 2 are arranged along the long side direction of the outer layer FRP pipe 4; the seawater and sea sand concrete 5 is prepared from cement, seawater, sea sand and broken stone. The first FRP pipe 1 is located in the space range of the upper part 3/5 of the beam, the seawater sea sand concrete 5 is filled and poured in the beam, and the full FRP pipe seawater sea sand concrete 5 beam wrapped with FRP is formed after the pouring and maintenance of the seawater sea sand concrete 5 are completed. According to the invention, the whole beam is wrapped into a whole through the first FRP pipe 1, the use of FRP stirrups is reduced, the self weight of the beam is reduced, and the bending resistance of the beam is enhanced at the same time; the FRP round pipes are used as tensile compression members of the beam, so that the good tensile property of the FRP pipes is fully exerted, the corrosion resistance of the FRP pipes is fully exerted due to the seawater sea sand concrete 5 filled in the beam, the service life of the beam is prolonged, and meanwhile, the FRP pipes are good in thermal property and low in thermal conductivity and can be used in fireproof buildings; the invention adopts seawater and sea sand to replace river sand as the concrete raw material, greatly reduces the influence of exploiting river sand resources to destroy the ecological environment, and is green, low-carbon, economic and environment-friendly.

Because the FRP material has the characteristic of brittleness, when the FRP material is used as a longitudinal bar in a tension area, the composite bar combining the reinforcing bars is adopted, and the ductility of the member is increased. The different embodiments of the present application have the following two essential differences:

one is in the form of reinforcing the sea water sea sand concrete beam with FRP reinforcement, the tension area is provided with the composite reinforcement of the longitudinal fiber FRP isolation reinforcement, and the compression area is provided with the composite reinforcement of the annular fiber FRP restraint sea water sea sand concrete; the two kinds of reinforcements are designed and used as reinforcing steel bars; the annular limit is mainly used for forming the template.

The other type is in the form of an FRP-seawater sea sand concrete composite beam, and aims to exert the tensile property of the FRP in a tension area and improve the compression property by the restraint of a compression area, and each prefabricated FRP is convenient to construct.

A construction method of a full FRP pipe seawater sea sand concrete beam comprises the following specific steps:

(1) the outer surface of the second FRP pipe 2, the inner surface of the outer FRP pipe 4 and the inner and outer surfaces of the first FRP pipe 1 are all subjected to frosting or shear connector processing, the roughness of the second FRP pipe is increased, and the interface bonding between each FRP pipe and concrete is enhanced; wherein: according to actual construction conditions, whether the outer-layer FRP pipe and the first FRP pipe adopt a frosting mode or not can be selected, but the outer surface of the second FRP pipe needs to be frosted, the inner surface is a cavity or an interface contacted with the steel pipe and the steel bar can be connected with the steel pipe or the steel bar in a bonding mode without frosting.

(2) Fixedly installing the first FRP pipe 1 on a template and pouring seawater sea sand concrete 5;

(3) the outer FRP pipe 4 is used as a side template and a bottom template of the beam, the second FRP pipe 2 is connected with the first FRP pipe 1 which is poured inside through reserved holes of the two end templates, and the two ends of the second FRP pipe extend out of one section of length to be used as the lap joint length. The end formwork is mainly used for fixing the positions of the first FRP pipe 1 and the second FRP pipe 2, and after the first FRP pipe 1 and the second FRP pipe 2 are fixed, the first FRP pipe 1 and the second FRP pipe 2 are poured by seawater sea sand concrete 5, so that the first FRP pipe 1 and the second FRP pipe 2 are prevented from displacing during pouring, and the strength of the poured seawater sea sand concrete beam is further reduced; the lap joint length is reserved so that the connection between the first FRP pipe 1 and the second FRP pipe 2 and the end formwork is more stable; in actual use; the end formworks can also adopt an additional formwork (mainly for actual operation) or adopt prefabricated sleeve connection.

(4) And pouring seawater sea sand concrete 5 from the top of the beam until the top is sealed.

According to the method, the FRP pipe and the seawater sea sand concrete 5 are used for replacing the traditional reinforced concrete, and the FRP pipe can be used for a beam with the enhanced bending resistance in the seawater sea sand concrete structure, the marine environment and buildings with special function requirements on electromagnetic interference resistance and the like while the environmental pressure is relieved.

Example two:

referring to fig. 3, the present embodiment is different from the first embodiment only in that: in this embodiment, a plurality of sets of third FRP pipes are installed on the inner wall of the first FRP pipe 1 in the circumferential direction.

The third FRP pipe 6 of a plurality of groups that increases in this embodiment not only can improve the bulk strength of the sea water sea sand concrete beam after pouring, still is favorable to improving the inside intensity of first FRP pipe 1, and wherein, a plurality of third FRP pipe 6 of a plurality of groups can be not only circular arrangement, can also be rectangle, triangle-shaped etc. and arrange.

Example three:

referring to fig. 4 to 5, the present embodiment is different from the first embodiment only in that the three second FRP pipes 2 mentioned in the first embodiment are replaced with a group of second FRP pipes 2, and the cross section of the second FRP pipe 2 is replaced with a rectangle from the previous circle.

Three groups of second FRP pipe 2 in this embodiment close into a rectangle FRP pipe wholly, compare in three groups of solitary rectangle FRP pipes, and the intensity of the compression resistance of sea water sea sand concrete beam lower part can be improved to the rectangle FRP pipe.

A plurality of groups of third FRP pipes can be additionally arranged on the inner wall of the first FRP pipe in the circumferential direction, three second FRP pipes 2 mentioned in the first embodiment are replaced by one group of second FRP pipes 2, and the section of each second FRP pipe 2 is replaced by a rectangle from a round shape; the combination of the second embodiment and the third embodiment has better bending resistance.

Example four:

referring to fig. 6 to 8, the present embodiment differs from the first embodiment only in that three sets of first FRP pipes 1 are provided, the first FRP pipes 1 and the second FRP pipes 2 adjacent to each other vertically correspond to each other, the diameter of the first FRP pipe 1 is the same as that of the second FRP pipe 2, and a steel bar or a steel pipe 3 is inserted into the second FRP pipe 2; first FRP pipe 1 in this embodiment is the same with second FRP pipe 2's size, and first FRP pipe 1 is inside to be filled sea water sea sand concrete 5, and its and wear to establish the looks adaptation of reinforcing bar or steel pipe 3's second FRP pipe 2, the intensity of improvement roof beam that can be very big. In the embodiment, the diameters of the first FRP pipes 1 and the second FRP pipes 2 adjacent to each other up and down on the same side are different, but the specifications of all the first FRP pipes 1 in the same beam are the same, and the specifications of all the second FRP pipes 2 are also the same; because the steel bar or steel pipe 3 is arranged in the second FRP pipe 2 in a penetrating way, the section diameter of the steel bar or steel pipe 3 is also matched with the inner diameter of the second FRP pipe 2.

Example five:

the length of the first FRP pipe 1 and the second FRP pipe 2 is larger than that of the outer FRP pipe, and the adjacent two groups of seawater sea sand concrete 5 beams are lapped or sleeved. Wherein, two adjacent groups of seawater sea sand concrete 5 beams can be connected in the forward direction or in the reverse direction (namely, connected by turning 180 degrees); when the seawater sea sand concrete 5 is positively connected or directionally connected, the stress conditions of the first FRP pipe 1 and the second FRP pipe 2 may change, for example: when the sea water sea sand concrete beam is connected in the forward direction, the bottom of the sea water sea sand concrete beam 5 is a tension area, the top of the sea water sea sand concrete beam 5 is a compression area, and when the sea water sea sand concrete beam is connected in the reverse direction, the tension area and the compression area of the sea water sea sand concrete beam 5 can be changed along with the tension area and the compression area; the stress of the first FPR pipe and the second PRP pipe can also change along with the forward and backward connection of the seawater and seawater sand concrete 5 beam; therefore, the first FRP pipe 1 and the second FRP pipe 2 are considered to be compressed as well as compressed.

When two adjacent groups of seawater sea sand concrete 5 are connected, when the two groups of seawater sea sand concrete are connected in the forward direction, the first FRP pipe 1 of one group of beams and the first FRP pipe 1 of the other group of beams can be sleeved or lapped; the second FRP pipe 2 of one group of beams and the second FRP pipe 2 of the other group of beams can be sleeved or lapped; then pouring;

since the tube types and the tube numbers of the various specifications, the first FRP tube 1 and the second FRP tube 2 are listed in the examples 1 to 5; the following different tube-type connections are therefore proposed:

(1) the small-diameter circular tube connection mode is as follows: as shown in fig. 9, the small diameter circular pipes (the second FRP pipe 2 or the third FRP pipe 6) in the seawater sea sand concrete 5 beam coated with the FRP pipes are connected by screw threads or glue. The pipe ends of the prefabricated FRP threaded connection round pipes are processed into external threads (the directions of the threads at the left end and the right end are opposite), the FRP threaded connection round pipes are respectively aligned to the internal threads of small round pipes in the seawater sea sand concrete 5 beams at the left side and the right side in the connection process, and the FRP small-diameter round pipes of the two side beams are connected into a whole by rotating the FRP threaded connection round pipes. And (4) gluing connection, namely gluing connection between the FRP connecting circular pipe and two pipes needing to be connected.

(2) The connection mode of the large-diameter circular tube is as follows: as shown in fig. 10, the large-diameter circular pipes (first FRP pipes 1) in the FRP-encased seawater sea sand concrete 5 beam are connected by bolts. Prefabricating an FRP bolt template: the template downside is semi-circular FRP pipe (diameter size wraps up the FRP major diameter pipe in the live both sides roof beam completely), and there is the reservation bolt hole upper and lower both sides respectively, then pour sea water sea sand concrete 5 in the space of the big pipe of both sides FRP, the template upside is the semi-circular pipe of FRP and the upper and lower both sides of reservation bolt hole respectively that diameter size and the semi-circular pipe template of downside are the same afterwards, couple together two upper and lower semi-circular FRP pipe templates with the stainless steel bolt and make the roof beam connect into a whole at the FRP major diameter FRP pipe of both sides.

(3) The connection mode of the bidirectional U-shaped pipe is as follows: as shown in fig. 11-12, the FRP-coated U-shaped tubes of the seawater sea sand concrete 5 beam coated with FRP are connected in a lap joint manner. Prefabricating an FRP wrapped U-shaped pipe (an outer FRP pipe); two types of U-shaped pipes are prefabricated in the prefabrication process respectively, the left side and the right side of the first type of U-shaped pipe protrude a part from the length of the whole beam, and the cross sectional area of the protruding part is smaller than that of the beam. The length of the second U-shaped pipe is equal to that of the whole beam. In the lapping process, the protruding part of the first U-shaped pipe is lapped at the bottom of the second U-shaped pipe, and seawater sea sand concrete 5 is poured in the gap part after lapping is finished so as to be connected into a whole.

(4) The lap joint mode of the one-way U-shaped pipe is as follows: as shown in fig. 13, the FRP-coated U-shaped tubes of the seawater sea sand concrete 5 beam coated with FRP are connected in a lap joint manner. The prefabricated U-shaped tube with the FRP wrapped outside is respectively prefabricated into two types of U-shaped tubes in the prefabrication process, the left side and the right side of the first type of U-shaped tube protrude a part from the length of the whole beam, and the cross section area of the protruding part is smaller than that of the beam. The length of the second U-shaped pipe is equal to that of the whole beam. In the lapping process, the protruding part of the first U-shaped pipe is lapped at the bottom of the second U-shaped pipe, and seawater sea sand concrete 5 is poured in the gap part after lapping is finished so as to be connected into a whole.

(5) Rectangular pipe connected mode: as shown in fig. 14-15, rectangular pipes in the seawater sea sand concrete 5 beam wrapped with FRP are connected by bolts. Prefabricating an FRP bolt template: the template downside is half rectangle FRP pipe (the FRP rectangular pipe in the both sides roof beam is lived in the complete parcel of cross-sectional size), and has reserved bolt hole respectively in upper and lower both sides, then pour sea water sea sand concrete 5 in the space of both sides FRP rectangular pipe, the template upside is the same half rectangle FRP pipe of FRP pipe template of cross-sectional size and downside and has reserved bolt hole respectively in upper and lower both sides afterwards, with two half rectangle FRP pipe templates about stainless steel bolt with the connection of two half rectangle FRP pipe templates make the roof beam connect into a whole in the FRP rectangular pipe of both sides. FRP round pipes in the seawater sea sand concrete 5 beam wrapped with FRP all penetrate through templates at two ends of the beam.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The utility model provides a full FRP pipe sea water sea sand concrete beam which characterized in that: the marine-seawater; the cross section of the outer-layer FRP pipe (4) is U-shaped, a plurality of groups of first FRP pipes (1) are arranged at the upper part of the inner side of the outer-layer FRP pipe (4), a plurality of groups of second FRP pipes (2) are positioned at the lower part of the inner side of the outer-layer FRP pipe (4), and a plurality of groups of first FRP pipes (1) correspond to the second FRP pipes (2); the seawater sea sand concrete (5) is filled in the outer-layer FRP pipe (4); the inside of the first FRP pipes (1) of a plurality of groups is filled with seawater sea sand concrete (5).

2. The full FRP pipe seawater sea sand concrete beam as claimed in claim 1, wherein: the outer FRP pipe (4) is of an integrated structure, and the bottom of the outer FRP pipe (4) is open.

3. The full FRP pipe seawater sea sand concrete beam as claimed in claim 1, wherein: the outer-layer FRP pipe (4) and the first FRP pipe (1) are both made of winding-molded fiber reinforced plastics, and the second FRP pipe (2) is made of pultrusion-molded fiber reinforced plastics.

4. The full FRP pipe seawater sea sand concrete beam as claimed in claim 1, wherein: the number of the first FRP pipes (1) and the number of the second FRP pipes (2) are not less than one group.

5. The full FRP pipe seawater sea sand concrete beam as claimed in claim 1, wherein: the first FRP pipe (1) and the second FRP pipe (2) are arranged along the long side direction of the outer-layer FRP pipe (4).

6. The full FRP pipe seawater sea sand concrete beam as claimed in claim 1, wherein: each group of first FRP pipes (1) is internally detachably connected with a plurality of groups of third FRP pipes (6), each group of third FRP pipes (6) is arranged in parallel with the inner wall of the first FRP pipe (1), and the cross-sectional area of each group of third FRP pipes (6) is smaller than that of the first FRP pipe (1).

7. The full FRP pipe seawater sea sand concrete beam as claimed in claim 6, wherein: the cross section of the first FRP pipe (1) and the cross section of the third FRP pipe (6) are both circular, and the cross section of the second FRP pipe (2) is circular or rectangular.

8. The full FRP pipe seawater sea sand concrete beam as claimed in claim 7, wherein: the interiors of the groups of second FRP pipes (2) are of hollow structures, and reinforcing steel bars or steel pipes (3) are detachably connected in the second FRP pipes (2); the cross sectional area of the steel bar or steel pipe (3) is matched with the cross sectional area of the interior of the second FRP pipe (2).

9. A construction method of a full FRP pipe seawater sea sand concrete beam is used for manufacturing the full FRP pipe seawater sea sand concrete beam of claims 1 to 8, and is characterized in that:

(1) preparing the outer-layer FRP pipe (4), the first FRP pipe (1) and the second FRP pipe (2), wherein the outer surface of the second FRP pipe (2) is subjected to sanding or shearing connector treatment;

(2) pouring seawater sea sand concrete (5) inside the first FRP pipe (1);

(3) the first FRP pipe (1) is used as a template of a seawater sea sand concrete beam, two end templates are additionally arranged at two ends of the first FRP pipe (1), and the second FRP pipe (2) is connected with the poured first FRP pipe (1) through reserved holes of the two end templates;

(4) and pouring seawater sea sand concrete (5) from the opening at the top of the outer-layer FRP pipe (4) until the top is sealed.

10. The construction method of the full FRP pipe seawater sea sand concrete beam as claimed in claim 9, wherein: the length of the first FRP pipe (1) and the length of the second FRP pipe (2) are larger than that of the outer FRP pipe (4), and two adjacent groups of seawater sea sand concrete beams are overlapped or sleeved.