CN111173194A - FRP truss node structure and implementation method thereof - Google Patents
FRP truss node structure and implementation method thereof Download PDFInfo
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- CN111173194A CN111173194A CN202010108205.7A CN202010108205A CN111173194A CN 111173194 A CN111173194 A CN 111173194A CN 202010108205 A CN202010108205 A CN 202010108205A CN 111173194 A CN111173194 A CN 111173194A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/28—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of materials not covered by groups E04C3/04 - E04C3/20
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5837—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form
- E04B1/585—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form with separate connection devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses an FRP truss node structure and an implementation method thereof; the steel box is provided with a plurality of openings; a steel pipe; FRP pipes; one end of the steel pipe is inserted into the FRP pipe, and the other end of the steel pipe extends into the steel box and then is welded. A plurality of holes are formed in the pipe wall contact position of the steel pipe and the FRP pipe along the pipe shaft direction; the stud penetrates through the hole and is used for connecting and fixing the FRP pipe and the steel pipe; micro-expansive concrete; and the guide pipe is used for pouring the micro-expansion concrete into the steel box and the steel pipe. The circumferential stress generated by the micro-expansion concrete and the studs act together to ensure that the steel pipe is tightly attached to the inner wall of the FRP pipe; the part of the stud in the steel pipe is surrounded by the expansive concrete to form a shearing force piece so as to enhance the connection between the steel pipe and the micro expansive concrete; the compressive strength and durability of the micro-expansion concrete are improved through the restraint of the steel box and the steel pipe. The invention has the advantages of high bearing capacity, high rigidity, good durability and the like.
Description
Technical Field
The invention belongs to the field of structural engineering and bridge engineering, and particularly relates to an FRP truss node structure and an implementation method thereof.
Background
Fiber Reinforced Plastic (FRP) is widely applied to various fields of civil engineering due to the advantages of light weight, high strength, corrosion resistance and the like. The FRP pipe truss is a novel building structure appearing in recent years, and in the using process, the rod piece is in a one-way and full-section stress state, so that the characteristics of high strength and rigidity of the composite material along the fiber direction can be fully exerted.
The traditional connection modes of the steel truss nodes comprise welding, high-strength bolt connection and the like. However, due to the characteristics of FRP materials, such as the relatively low elastic modulus of GFRP (Glass Fiber Reinforced Polymer), after high-strength bolts are used for connection, the GFRP will creep under high stress, which may lead to loose connection and truss members. Obviously, the welding connection mode is not suitable for FRP materials. The invention aims to provide a node structure capable of ensuring the tight connection of FRP pipes in an FRP truss, and the node structure has the advantages of high bearing capacity, high rigidity, easiness in construction and good durability.
In patent document CN208933015U, a GFRP truss structure is disclosed, which is connected by adhesive bonding and fixing with polypropylene-stainless steel composite splints at truss nodes, and it is believed that the glue will only work after the bolts are loosened due to creep of the polypropylene plates under long-term loading. The patent obviously cannot overcome the creep problem of GFRP under the action of long-term high stress, and simultaneously has the problem of asynchronous fastening force of glue and bolts.
In patent document CN103029293A, a method for connecting a resin-based carbon fiber composite truss rod is disclosed, in which epoxy resin-based carbon fiber prepreg is used to make a thin shell for connection, and the thin shell and the composite truss rod are connected together by means of high temperature, epoxy resin bonding and pressurization. The method can not overcome the creep problem of GFRP under the action of long-term high stress, and the thin shell and the composite material truss rod piece are cured for 6 hours at the high temperature of 70 ℃ after being pressurized in the connecting process, and the high-temperature condition is difficult to realize in the construction process of the bridge structure.
In the patent document CN108825605, an assembly method of a main structure and a support rod of a carbon fiber composite truss is disclosed, in which one end of a composite rod is grooved, and the composite rod is glued, bolted or connected to the main structure through a prefabricated T-shaped joint and a bridge plate. The method weakens the strength of the composite material rod piece at the joint, and still cannot solve the problems of untight connection and unsynchronized fastening force of the glue and the bolt caused by creep deformation of the FRP rod piece in the cementing method.
In the patent document CN208201616U, a FRP pipe truss guide beam is disclosed, in which pretightening tooth joints and FRP bars are first connected into an integral member, and then each pretightening tooth joint is welded together. In the patent, the FRP material is more jagged, which damages the integrity of the FRP material and causes the local strength reduction. In addition, the surface treatment requirement on the parts of the pre-tightening force tooth joint is high, and the construction is complicated.
In summary, the structure and operation principle of the prior patent publication are completely different from those of the present invention. The invention provides a FRP pipe truss node structure with tight connection, which has the advantages of high bearing capacity, high rigidity, convenience in construction, good durability and the like, and has important significance for further popularization and application of FRP materials.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an FRP truss node structure and an implementation method thereof, the method overcomes the problems that the colloid and the bolt are not stressed synchronously in the traditional rubber bolt connection method, the surface treatment requirement of parts is high in the pretightening force tooth connection method, the strength of the materials is reduced after tooth punching, and the like, and the FRP truss node structure has the advantages of tight connection, high node bearing capacity, high rigidity, easiness in construction, good durability and the like, and has high popularization value.
The technical scheme is as follows: the invention discloses an FRP truss node structure, and an implementation method, a construction method and a construction method thereof. The method comprises the following steps: a steel box having a plurality of openings; a steel pipe; FRP pipes; one end of the steel pipe is inserted into the FRP pipe, the other end of the steel pipe extends into the steel box, and a plurality of holes are formed in the contact position of the steel pipe and the pipe wall of the FRP pipe along the axial direction; the stud is used for connecting and fixing the FRP pipe and the steel pipe; micro-expansive concrete; and the guide pipe is used for pouring the micro-expansion concrete into the steel box and the steel pipe. The circumferential stress generated by the micro-expansion concrete and the studs act together to ensure that the steel pipe is tightly attached to the inner wall of the FRP pipe; the part of the stud in the steel pipe is surrounded by the expansive concrete to form a shearing force piece so as to enhance the connection between the steel pipe and the micro expansive concrete; the compressive strength and durability of the micro-expansion concrete are improved through the restraint of the steel box and the steel pipe.
Furthermore, the steel box is provided with a plurality of pore canals, and the number, the shape and the size of the pore canals are determined according to the number, the shape and the size of the steel pipes and the guide pipes.
Furthermore, one end of the steel pipe, which is far away from the steel box, is provided with a baffle plate with the same size as the steel pipe, and the baffle plate is provided with a plurality of air holes; the pipe wall of the steel pipe between the baffle plate and the insertion end is provided with a plurality of holes; the baffle is used for avoiding the micro-expansive concrete flows out, and the air holes are used for exhausting air in the steel pipe when the micro-expansive concrete is poured in.
Further, the inner diameter of the FRP pipe is the same as the outer diameter of the steel pipe, and the FRP pipe is sleeved outside the steel pipe. The same positions of the tube wall of the FRP tube corresponding to the steel tube are provided with a plurality of holes. The steel pipe and the FRP pipe are connected through a bolt penetrating through the hole and the hole.
Furthermore, the stud consists of a screw and a nut, wherein one end of the screw is processed into threads to be matched with the nut. The studs are inserted into the holes and penetrate through the steel pipes and the FRP pipes to form shear parts for connecting the steel pipes and the FRP pipes and connecting the micro-expansion concrete inside the steel pipes and the FRP pipes.
Furthermore, the upper edge of the guide pipe is higher than the highest point of the steel pipe, so that the steel box and the steel pipe can be filled with micro-expansion concrete conveniently.
The invention also provides a construction method of the FRP truss node structure, which comprises the following steps:
1) prefabricating a steel box, a steel pipe and an FRP pipe according to design requirements;
2) drilling holes in advance on the surface of the steel pipe, and drilling through holes in advance on the surface of the baffle;
3) inserting one end of a steel pipe into the FRP pipe, extending the other end of the steel pipe into the steel box, and welding the steel pipe and the steel box to form an integral structure;
4) nesting the FRP pipe outside the steel pipe, and screwing down the stud after penetrating the hole of the steel pipe and the hole of the FRP pipe by using a screw cap;
5) installing a guide pipe at a position of a preset pore channel of the steel box;
6) pouring micro-expansion concrete through a conduit until the steel box and the steel pipe are filled;
7) and curing the micro-expansive concrete to the designed strength, removing the guide pipe, and sealing the steel box after removing the redundant micro-expansive concrete.
Advantageous effects
The invention provides an FRP truss node structure and an implementation method thereof, and the FRP truss node structure has the following beneficial effects:
1) the connection mode is compact. By using the traditional high-strength bolt connection mode, the FRP material is in a high-stress state and creeps, so that the connection between the rod pieces is loosened. The invention ensures that the FRP pipes in the node are tightly connected through the mutual nesting of the steel pipes and the FRP pipes, the internal through studs and the poured micro-expansion concrete.
2) The node has high bearing capacity and high rigidity. The connecting node in the invention adopts a steel box structure, and micro-expansion concrete is poured into the connecting node, so that the bearing capacity of the node is effectively improved, and the rigidity of the node is increased.
3) Easy construction and good durability. All parts of the invention can be produced in advance, the welding workload is less, and the construction efficiency is high. Meanwhile, the high-durability FRP material is used, and the later maintenance is easy.
Drawings
FIG. 1 is a schematic construction of an embodiment of the present invention;
FIG. 2 is a schematic view of the embodiment of the invention illustrating the welding of steel pipes extending into a steel box;
FIG. 3 is a schematic illustration of the bolting of FRP pipes and steel pipes according to an embodiment of the invention;
FIG. 4 is a schematic view of a steel pipe bottom baffle according to an embodiment of the present invention;
the figure shows that: the steel box comprises a steel box 1, a steel pipe 2, a baffle 21, a baffle air hole 211, a steel pipe wall opening 22, an FRP pipe 3, an FRP pipe wall opening 31, a stud 4, expansive concrete 5 and a guide pipe 6.
Detailed Description
In order to further illustrate the present invention, the following examples and drawings are included to further illustrate the present invention, but should not be construed as limiting the scope of the present invention.
As shown in fig. 1-4: the FRP truss node structure comprises a steel box 1, a steel pipe 2 with one end inserted into the steel box 1, an FRP pipe 3 with the inner diameter being the same as the outer diameter of the steel pipe 2, a stud 4 for connecting the steel pipe 2 and the FRP pipe 3, micro-expansion concrete 5 poured into the steel box 1 and the steel pipe 2, and a conduit 6 for pouring the micro-expansion concrete 5 into the steel box 1 and the steel pipe 2.
Wherein the steel box 1 has a plurality of holes 11, wherein the number, shape and size of the holes 11 are determined according to the number, shape and size of the steel pipes 2 and the conduits 6.
One end of the steel pipe 2, which is far away from the steel box 1, is provided with a baffle plate 21 with the same inner diameter as that of the steel pipe 2, and the baffle plate 21 is provided with a plurality of air holes 211; the pipe wall of the steel pipe 2 between the baffle 21 and the insertion end is provided with a plurality of holes 22; the baffle 21 is used for avoiding the micro-expansion concrete 5 flows out, and the air holes 211 are used for discharging the air in the steel pipe 2 when the micro-expansion concrete 5 is poured in.
The inner diameter of the FRP pipe 3 is the same as the outer diameter of the steel pipe 2, and the FRP pipe is sleeved outside the steel pipe 2; the same positions of the tube wall of the FRP tube 3 corresponding to the tube wall of the steel tube 2 are provided with a plurality of holes 31; the steel pipe 2 and the FRP pipe 3 are connected through a bolt 4 penetrating through the hole 22 and the hole 31. And epoxy resin is coated between the outer wall of the steel pipe 2 and the inner wall of the FRP pipe 3, so that the outer wall of the steel pipe 2 is tightly attached to the inner wall of the FRP pipe 3.
The stud 4 is composed of a screw rod 41 and a screw cap 42, wherein one end of the screw rod 41 is processed into threads which are matched with the screw cap 42; the studs 4 are inserted into the holes 22 and 31 and penetrate through the steel pipes 2 and the FRP pipes 3 to form shearing pieces for connecting the steel pipes 2 and the FRP pipes 3 and connecting the internal micro-expansion concrete 5.
The upper edge of the guide pipe 6 is higher than the highest point of the steel pipe 2, so that the steel box 1 and the steel pipe 2 can be filled with the micro-expansion concrete 5 conveniently.
The implementation method of the FRP truss node structure of the embodiment includes the following specific steps:
s1, prefabricating the steel box 1, the steel pipe 2 and the FRP pipe 3 according to design requirements;
s2, pre-drilling the holes 22 on the surface of the steel pipe 2, and pre-drilling the air holes 211 on the surface of the baffle 21;
s3, inserting one end of the steel pipe 2 into the FRP pipe 3, extending the other end into the steel box 1, and welding the steel pipe and the steel box 1 to form an integral structure;
s4, nesting the FRP pipe 3 outside the steel pipe 2, and fastening the stud 4) in the hole 22 of the steel pipe 2 and the hole 31 of the FRP pipe 3 by using a nut 42;
s5, installing the guide pipe 6 at the position of the preset hole channel 11 of the steel box 1;
s6, pouring micro-expansion concrete 5 through the guide pipe 6 until the steel box 1 and the steel pipe 2 are filled;
s7, curing the micro-expansion concrete 5 to the designed strength, removing the guide pipe 6, removing the redundant micro-expansion concrete 5, and sealing the steel box 1.
The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.
Claims (8)
1. The utility model provides a FRP truss node structure which characterized in that: the steel box comprises a steel box (1), a steel pipe (2) with one end inserted into the steel box (1), an FRP pipe (3) with the inner diameter being the same as the outer diameter of the steel pipe (2), a stud (4) used for connecting the steel pipe (2) and the FRP pipe (3), micro-expansion concrete (5) poured into the steel box (1) and the steel pipe (2), and a conduit (6) used for pouring the micro-expansion concrete (5) into the steel box (1) and the steel pipe (2).
2. The FRP truss joint structure of claim 1, wherein: the steel box (1) is provided with a plurality of pore canals (11), wherein the number, the shape and the size of the pore canals (11) are determined according to the number, the shape and the size of the steel pipes (2) and the guide pipes (6).
3. The FRP truss joint structure of claim 1, wherein: one end of the steel pipe (2) far away from the steel box (1) is provided with a baffle plate (21) with the same inner diameter as the steel pipe (2), and the baffle plate (21) is provided with a plurality of air holes (211); the pipe wall of the steel pipe (2) between the baffle (21) and the insertion end is provided with a plurality of holes (22); baffle (21) are used for avoiding little expanded concrete (5) flow, bleeder vent (211) are used for when little expanded concrete (5) are irritated, the inside air escape of steel pipe (2).
4. The FRP truss joint structure of claim 1, wherein: the inner diameter of the FRP pipe (3) is the same as the outer diameter of the steel pipe (2), and the FRP pipe is sleeved outside the steel pipe (2); the same positions of the tube wall of the FRP tube (3) corresponding to the tube wall of the steel tube (2) are provided with a plurality of holes (31); the steel pipe (2) and the FRP pipe (3) are connected through a stud (4) penetrating through the hole (22) and the hole (31).
5. The FRP truss joint structure of claim 1, wherein: the stud (4) is composed of a screw rod (41) and a screw cap (42), and one end of the screw rod (41) is processed into threads which are matched with the screw cap (42); the studs (4) are inserted into the holes (22) and (31) and penetrate through the steel pipe (2) and the FRP pipe (3) to form a shearing piece for connecting the steel pipe (2) and the FRP pipe (3) and connecting the internal micro-expansion concrete (5).
6. The FRP truss joint structure of claim 1, wherein: and epoxy resin is coated between the outer wall of the steel pipe (2) and the inner wall of the FRP pipe (3) so that the outer wall of the steel pipe (2) is tightly attached to the inner wall of the FRP pipe (3).
7. The FRP truss joint structure of claim 1, wherein: the upper edge of the guide pipe (6) is higher than the highest point of the steel pipe (2), so that the steel box (1) and the steel pipe (2) can be filled with the micro-expansion concrete (5) conveniently.
8. An implementation method of an FRP truss node structure is characterized by comprising the following steps: the method comprises the following steps:
1) prefabricating a steel box (1), a steel pipe (2) and an FRP pipe (3) according to design requirements;
2) pre-drilling holes (22) on the surface of the steel pipe (2), and pre-drilling through holes (211) on the surface of the baffle (21);
3) inserting one end of a steel pipe (2) into the FRP pipe (3), extending the other end into the steel box (1), and welding the steel pipe and the steel box (1) to form an integral structure;
4) nesting the FRP pipe (3) outside the steel pipe (2), and screwing down the stud (4) after penetrating the hole (22) of the steel pipe (2) and the hole (31) of the FRP pipe (3) by using a screw cap (42);
5) installing a conduit (6) at a predetermined track (11) location of the steel box (1);
6) pouring micro-expansion concrete (5) through a conduit (6) until the steel box (1) and the steel pipe (2) are filled;
7) and curing the micro-expansion concrete (5) to the designed strength, removing the guide pipe (6), and sealing the steel box (1) after removing the redundant micro-expansion concrete (5).
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| CN202010108205.7A CN111173194B (en) | 2020-02-21 | 2020-02-21 | FRP truss node structure and implementation method thereof |
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| CN111173194B CN111173194B (en) | 2022-02-15 |
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Cited By (4)
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| CN114108810A (en) * | 2021-11-29 | 2022-03-01 | 扬州大学 | Composite enhanced steel sleeve joint for assembling FRP pipe truss and installation method |
| CN114108821A (en) * | 2021-11-23 | 2022-03-01 | 清华大学 | Node connecting structure between FRP pultruded profiles and construction and assembly method |
| CN114313126A (en) * | 2022-01-13 | 2022-04-12 | 东北石油大学 | Fabricated FRP concrete combined guyed tower type platform system and construction method thereof |
| CN115012577A (en) * | 2022-05-06 | 2022-09-06 | 西安交通大学 | Fiber Reinforced Plastic (FRP) winding type truss connection node |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114108810A (en) * | 2021-11-29 | 2022-03-01 | 扬州大学 | Composite enhanced steel sleeve joint for assembling FRP pipe truss and installation method |
| CN114313126A (en) * | 2022-01-13 | 2022-04-12 | 东北石油大学 | Fabricated FRP concrete combined guyed tower type platform system and construction method thereof |
| CN114313126B (en) * | 2022-01-13 | 2024-04-19 | 东北石油大学 | Assembled FRP concrete combined guy cable tower platform system and construction method thereof |
| CN115012577A (en) * | 2022-05-06 | 2022-09-06 | 西安交通大学 | Fiber Reinforced Plastic (FRP) winding type truss connection node |
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| Publication number | Publication date |
|---|---|
| CN111173194B (en) | 2022-02-15 |
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