CN114108810A - Composite enhanced steel sleeve joint for assembling FRP pipe truss and installation method - Google Patents
Composite enhanced steel sleeve joint for assembling FRP pipe truss and installation method Download PDFInfo
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- CN114108810A CN114108810A CN202111438378.6A CN202111438378A CN114108810A CN 114108810 A CN114108810 A CN 114108810A CN 202111438378 A CN202111438378 A CN 202111438378A CN 114108810 A CN114108810 A CN 114108810A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002131 composite material Substances 0.000 title abstract description 7
- 238000009434 installation Methods 0.000 title abstract description 7
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 238000004873 anchoring Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000003733 fiber-reinforced composite Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 71
- 239000011151 fibre-reinforced plastic Substances 0.000 description 71
- 230000035882 stress Effects 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- 230000006378 damage Effects 0.000 description 5
- 239000011440 grout Substances 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
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- 230000004927 fusion Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 210000001503 joint Anatomy 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
-
- 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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1924—Struts specially adapted therefor
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention relates to a composite enhanced steel sleeve node for assembling an FRP pipe truss and an installation method thereof, and the composite enhanced steel sleeve node comprises an FRP pipe, an internal thread steel sleeve and at least two hollow bolts, wherein the FRP pipe is at least partially sleeved in the internal thread steel sleeve, the hollow bolts penetrate through the FRP pipe in the internal thread steel sleeve from one side surface of the internal thread steel sleeve and penetrate out from the other side surface of the internal thread steel sleeve, ultrahigh-performance concrete is filled between the FRP pipe and the internal thread steel sleeve and inside the FRP pipe, a notch is formed in the middle part of each hollow bolt, one end surface of each hollow bolt is provided with an opening, the opening is communicated with the notch, and two ports of the notch in the axial direction of the hollow bolt are positioned in a gap between the FRP pipe and the internal thread steel sleeve. The invention introduces the fiber reinforced composite material with good chemical corrosion resistance, good insulating property, simple forming process, light weight, high strength, good earthquake resistance, high construction speed and high industrialization degree, and injects UHPC to improve the node anchoring capability.
Description
Technical Field
The invention belongs to the technical field of building structures, and particularly relates to a composite enhanced steel sleeve node for assembling an FRP pipe truss and an installation method.
Background
With the continuous development of engineering materials and building structure forms, the truss is one of more reasonable structure forms in a rod system structure, and the universality of the truss structure in various buildings is enough to prove the excellent stress performance of the truss structure. Meanwhile, each rod piece and the connecting piece in the truss can be designed and manufactured in a standardized manner, the components can be prefabricated in a factory, and the components can be simply assembled on site, so that the transportation and installation cost can be reduced, and meanwhile, the construction method conforms to the building industrialization idea advocated in China.
In recent years, Fiber Reinforced Polymer (FRP) is popularized and applied in various fields due to its characteristics of light weight, high strength and the like, with the development of material science and the continuous reinforcement of inter-subject fusion, the Fiber Reinforced Polymer (FRP) section with good tensile property is applied to a truss structure as a main bearing member, so that the characteristics of high specific strength and high specific rigidity of the fiber reinforced polymer can be highlighted, and the full utilization of the material is realized. The Fiber Reinforced Plastic (FRP) is a high-performance composite material formed by combining a fiber material and a matrix material through a specific processing technology, and the fibers commonly used in the FRP mainly comprise carbon fibers, aramid fibers, glass fibers, basalt fibers and the like, and can be used as a reinforcing material. Compared with the traditional concrete material and steel, the fiber reinforced composite material has the characteristics of good chemical corrosion resistance, good insulating property, light weight, high strength and the like, meets the industrial requirements, conforms to the development direction of building energy conservation and the like, and the fiber reinforced composite material section bar formed at one time is more environment-friendly compared with the traditional concrete material and steel.
Therefore, the fiber reinforced composite material section (hereinafter referred to as FRP section) is applied to the truss structure as a main stress member, and has better utilization value and feasibility for the fiber reinforced composite material. The FRP section cannot be welded like steel due to the product characteristics, and the FRP section is connected by adopting bolts after being punched to generate defects, and stress concentration is generated at the pore passage to damage the FRP section. Therefore, when the FRP section is used as a main stressed member in engineering, the problem of field connection of the FRP section is the first problem to be solved in popularization and application. The adoption of a proper connection method is crucial to the stress performance of the truss node and even the whole structure.
For the connection between FRP sections, the existing common connection methods at home and abroad mainly comprise glue joint, mechanical connection, mixed connection and the like, and the characteristics and the application range of each connection type are different. For example, the gluing refers to that two or more members are connected together by using a specific adhesive, and the connection form is suitable for FRP profiles with different section types, and has the advantages of wide application range, less parts, light structure, higher connection rigidity, less stress concentration and the like. Like mechanical connection, the method is suitable for large-size section bar connection which can not meet the requirements of adhesive joint, common mechanical connection comprises bolt connection, rivet connection, metal gusset plate bolt group connection, pretightening force tooth connection and the like, and bolt connection is mostly applied at present. The hybrid connection means that at least more than two connection means are adopted when connecting the connected piece, and the current more hybrid connection mode that uses is glue-bolt hybrid connection, and this kind of connection mode has had both advantages of gluing and bolted connection concurrently.
These methods can make the truss meet the requirement of overall stability to a certain extent, but have many disadvantages to be researched and solved. The glue joint effect is often influenced by the type and strength of the adhesive, the geometric characteristics of the glued piece and other factors, so that the glue joint strength is easy to disperse greatly, the influence of the environment is obvious, the glue joint quality is difficult to detect and the like, and the occurrence of the conditions of glue layer shearing damage, glue layer peeling damage, glued piece stretching damage, glued piece peeling damage and the like is often unavoidable. The connection type of bolt connection needs to comprehensively consider the section shape, the size and the load size of a connected piece, so that the failure modes mainly include four types, namely extrusion failure, net area drawing failure, shearing failure and splitting failure. In addition, the stress concentration at the hole wall has no negligible effect on the reduction of the connection efficiency. Although the hybrid connection has the advantages of the former two types, the hybrid connection also has the disadvantages that the hybrid connection is reinforced by bolts during glue joint, so that the performances of stripping resistance, fatigue resistance and the like of a glue layer can be improved; on the other hand, stress concentration occurs near the hole wall due to the hole opening. With the continuous research on the FRP combined truss structure, the selection of a connection method with better seismic performance, lower construction difficulty and more economic cost is the key for applying the connection method to the actual engineering project.
Disclosure of Invention
Because the special treatment needs to be carried out on the glued surface in advance when the component is glued, the precision requirement between the glued components is higher, heating and pressurizing curing equipment is needed, the repairing is difficult, the gluing is permanent connection, the gluing cannot be disassembled, and the material is difficult to recycle; the adhesive has the advantages of high strength dispersity, low peel strength, difficulty in adhering a thick structure and transferring large load, high influence of environment (wet, hot and corrosive media) on the adhesive performance, and certain aging problem; the invention has the problems of difficult control of connection effect, poor reliability and the like, introduces UHPC with excellent durability to replace conventional adhesives aiming at the problems possibly caused by the cementing, and provides a composite enhanced steel sleeve node for assembling an FRP pipe truss and an installation method thereof.
The technical solution for realizing the purpose of the invention is as follows:
the reinforced internal thread steel sleeve comprises an FRP pipe, an internal thread steel sleeve and at least two hollow bolts, wherein the FRP pipe is at least partially sleeved in the internal thread steel sleeve, the hollow bolts penetrate through the FRP pipe in the internal thread steel sleeve from one side surface of the internal thread steel sleeve and penetrate out from the other side surface of the internal thread steel sleeve, ultrahigh-performance concrete is filled between the FRP pipe and the internal thread steel sleeve and inside the FRP pipe, a notch is formed in the middle of each hollow bolt, an end face of each hollow bolt is provided with an opening, the openings are communicated with the notches, and the notches are located in a gap between the FRP pipe and the internal thread steel sleeve at two ports of the axial direction of each hollow bolt.
Further, the number of the hollow bolts is two.
Further, the mounting directions of the two hollow bolts are different.
Further, the mounting directions of the two hollow bolts are perpendicular to each other.
Furthermore, a pair of first reserved bolt holes and a pair of second reserved bolt holes are formed in the FRP pipe, and a pair of third reserved bolt holes and a pair of fourth reserved bolt holes are formed in the inner thread steel sleeve.
Further, the ultra-high performance concrete comprises cement, quartz sand, silica fume, fly ash, mineral powder, steel fiber, water and a water reducing agent, and the weight ratio of each component is as follows: 10 to 50 percent of cement, 20 to 30 percent of quartz sand, 12 to 12.5 percent of silica fume, 0 to 35 percent of fly ash, 15 to 20 percent of mineral powder, 15 to 20 percent of water and 0.2 to 2.5 percent of water reducing agent, wherein the volume mixing amount of the steel fiber in the ultra-high performance concrete is 1.5 to 2.5 percent.
The truss node comprises a steel ball hinge and a plurality of enhanced internal thread steel sleeves, wherein one ends of the enhanced internal thread steel sleeves are connected with the surface of the steel ball hinge in a welding mode.
The installation method of the truss node comprises the following steps:
the method comprises the following steps: cleaning the surface and the end part of the steel sleeve with the internal thread by using alcohol, drying the steel sleeve by blowing, and then welding the steel sleeve with the steel ball hinge;
step two: cleaning the end part of the FRP pipe by using alcohol, extending into the internal thread steel sleeve, calculating and determining the extending length according to the axial force borne by the FRP pipe obtained by calculating the stress of the truss, and plugging the position, located at the position 5cm from the cross section of the outer end of the internal thread steel sleeve to the end face of the FRP pipe, of the outer surface of the FRP pipe by using epoxy resin;
step three: and (2) grouting the ultra-high performance concrete from the opening pressure at the bottom of the transverse hollow bolt far away from the steel spherical hinge, wherein the grouting material continuously flows, flows into the FRP pipe through the notch in the middle of the hollow bolt, fills the gap inside the FRP pipe and between the FRP pipe and the internal thread steel sleeve, and when the ultra-high performance concrete overflows from the opening at the bottom of the inverted vertical hollow bolt close to the steel spherical hinge, the fact that the pipe is filled with the high performance concrete at the moment is indicated, grouting is stopped, and hole sealing is leveled.
Compared with the prior art, the invention has the remarkable advantages that:
the invention introduces UHPC with excellent durability to replace conventional adhesives, and provides an enhanced internal thread steel sleeve, a truss node and a mounting method thereof, wherein a hollow bolt is arranged at a preset position where the FRP pipe and the internal thread steel sleeve are connected, so that on one hand, the FRP pipe and the UHPC/internal thread steel sleeve generate mechanical anchoring force in the stress process of the FRP pipe, thereby enhancing the bonding anchoring performance between the internal thread steel sleeve and the FRP pipe, and ensuring the anchoring position of the FRP pipe in the internal thread steel sleeve; on the other hand, UHPC is injected into the bottom of the hollow bolt, compared with the common epoxy resin type cementing agent, the injected UHPC has the characteristics of low price and good durability (ultraviolet ray resistance, frost resistance, acid/alkali/salt corrosion resistance and the like), and simultaneously the internal thread can improve the bonding property of the UHPC and the steel sleeve, so that the bonding anchoring property of the bolt and the integrity between the bolt and the sleeve can be further enhanced.
Drawings
FIG. 1 is a cross-sectional view of a circular reinforced internally threaded steel casing.
FIG. 2 is a cross-sectional view of a square reinforced internally threaded steel casing.
FIG. 3 is a schematic diagram of an FRP pipe to be assembled and an internal thread steel sleeve with reserved bolt holes.
FIG. 4 is a schematic diagram of the FRP pipe and the internally threaded steel sleeve in butt joint.
Fig. 5 is a schematic view of a truss node structure.
FIG. 6 is a schematic view of the reinforced internally threaded steel sleeve and steel ball hinge connection.
Fig. 7 is a perspective view of the hollow bolt.
Fig. 8 is a front view of the hollow bolt.
Fig. 9 is a sectional view taken along line a-a in fig. 8.
Fig. 10 is a sectional view taken along line B-B in fig. 8.
Fig. 11 is a sectional view taken along line C-C in fig. 8.
Fig. 12 is a bottom view of the hollow bolt.
Fig. 13 is a left side view of the hollow bolt.
Detailed Description
Specific implementations of the present invention are further described below in conjunction with the following figures.
Referring to fig. 1-4, the reinforced internal thread steel sleeve of the invention is divided into an inner sleeve and an outer sleeve, the inner sleeve is made of FRP section 1, the section of the inner sleeve can be round or square, and the outer sleeve is made of steel. The section shape of the steel sleeve is correspondingly selected or welded by adopting steel plates in the profile according to the shape of the FRP profile needing to be connected, so that the steel sleeve corresponds to the FRP profile, namely, a round steel sleeve is selected for the annular FRP pipe, and a square steel sleeve is selected for the square FRP profile. And the inner surface of the sleeve is subjected to thread treatment so as to improve the bonding property of the adhesive and the steel sleeve.
The FRP pipe 1 is at least partially sleeved in the internal thread steel sleeve 2, the hollow bolt 12 penetrates through the FRP pipe 1 in the internal thread steel sleeve 2 from one side surface of the internal thread steel sleeve 2 and penetrates out from the other side surface of the internal thread steel sleeve 2, ultrahigh-performance concrete is filled between the FRP pipe 1 and the internal thread steel sleeve 2 and inside the FRP pipe 1, a notch 9 is formed in the middle of the hollow bolt 12, an end face of the hollow bolt 12 is provided with an opening 13, the opening 13 is communicated with the notch 9, and two ports of the notch 9 in the axial direction of the hollow bolt 12 are located in a gap between the FRP pipe 1 and the internal thread steel sleeve 2.
Specifically, the number of the hollow bolts 12 is two.
Specifically, the mounting directions of the two hollow bolts 12 are perpendicular to each other.
Specifically, a pair of first reserved bolt holes 1-1 and a pair of second reserved bolt holes 1-2 are formed in the FRP pipe 1, and a pair of third reserved bolt holes 2-1 and a pair of fourth reserved bolt holes 2-2 are formed in the inner threaded steel sleeve 2.
The ultra-high performance concrete (UHPC) comprises cement, quartz sand, silica fume, fly ash, mineral powder, steel fiber, water and a water reducing agent. The weight ratio of each component is as follows: 10 to 50 percent of cement, 20 to 30 percent of quartz sand, 12 to 12.5 percent of silica fume, 0 to 35 percent of fly ash, 15 to 20 percent of mineral powder, 1.5 to 2.5 percent of steel fiber (volume mixing amount), 15 to 20 percent of water and 0.2 to 2.5 percent of water reducing agent.
With reference to fig. 5-6, the truss node construction: and connecting the enhanced internal thread steel sleeves through steel ball hinges 10 to form a truss node. The method comprises the steps of reserving bolt holes, arranging a hollow bolt reinforcing FRP pipe and an internal thread steel sleeve, arranging at least one horizontal hollow bolt and one vertical hollow bolt, determining the specific number by force calculation, and arranging grouting holes 3 and grout outlet holes 4 at the bottoms of the hollow bolts, wherein the grouting holes are arranged at the positions 3 and the grout outlet holes are arranged at the positions 4 in the figure as shown in figure 6.
A reinforced internally threaded steel casing is removed from figure 5 and configured as shown in figure 6. In the figure, the position 1 is an FRP pipe; 2, an internal thread steel sleeve is arranged; the position 3 is a grouting hole at the bottom of the transverse hollow bolt far away from the spherical hinge; the position 4 is a grout outlet close to the bottom of the inverted vertical hollow bolt of the spherical hinge; the position 5 is the end position of the FRP pipe in the internal thread steel sleeve and is not blocked; the stop of the FRP pipe at the outer end is shown at the position 6, which indicates that the FRP pipe still exists outside the position 6, and the position 8 which is 5cm away from the position 7 is blocked by epoxy resin before grouting; a gap between the FRP pipe and the internal thread steel sleeve is formed at the position 7, and epoxy resin is used for plugging before grouting; a groove 9 is formed in the middle of the hollow bolt, and two end ports of the groove are located in a gap 1/2 between the FRP pipe and the internal thread steel sleeve.
And connecting each enhanced internal thread steel sleeve with the steel spherical hinge 10 to form a truss node. And cleaning the surface of the internal thread steel sleeve and drying the surface. The length of the internal thread steel sleeve is twice of the length of the FRP pipe extending into the steel sleeve plus the middle distance, a grouting hole is formed in the lower surface before assembly, and a grout outlet is formed in the upper surface of the internal thread steel sleeve. The end parts of the rod pieces are cleaned by alcohol and are welded with the steel ball hinges.
The length of the FRP pipe extending into the internal thread steel sleeve is determined by calculation according to the axial force borne by the FRP pipe obtained by calculating the stress of the truss, and the corresponding positions determined by calculation, namely 8 positions of the FRP pipe and the internal thread steel sleeve, which are 5cm outwards from the position shown as 7 in the figure 6, at the cross section of the outer end are plugged by epoxy resin; cleaning the connecting part of the end part of the FRP pipe by using alcohol, and penetrating the FRP pipe into the steel sleeve with the internal thread.
UHPC is pressure-grouted from a grouting hole 3 at the bottom of the transverse hollow bolt far away from the spherical hinge, and compared with the common epoxy resin type cementing agent, the UHPC has the characteristics of low price and good durability (ultraviolet ray resistance, frost resistance, acid/alkali/salt corrosion resistance and the like). Grouting material continuously flows into the FRP pipe through the slotted hole in the middle of the hollow bolt, gaps between the interior of the FRP pipe and the internal thread steel sleeve are filled, when UHPC overflows from a grout outlet hole 4 at the bottom of the inverted vertical hollow bolt close to the spherical hinge, the UHPC is fully injected into the pipe at the moment, grouting is stopped, and hole sealing is leveled.
The connecting piece and the rod piece can be prefabricated and produced in a standardized way in a factory, and the cost can be reduced. Meanwhile, the FRP pipe has the advantages of good chemical corrosion resistance, good insulating property, simple forming process, light weight, high strength, good anti-seismic property and high construction speed, the bearing capacity and durability of the truss can be effectively improved by using the FRP pipe, and the assembly speed and the stress performance of the truss can be effectively improved by using the FRP pipe to assemble the nodes of the FRP pipe truss.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An enhanced internal thread steel sleeve is characterized by comprising an FRP pipe (1), an internal thread steel sleeve (2) and at least two hollow bolts (12),
the FRP pipe (1) is at least partially sleeved in the internal thread steel sleeve (2), the hollow bolt (12) penetrates through the FRP pipe (1) in the internal thread steel sleeve (2) from the surface of one side of the internal thread steel sleeve and penetrates out of the surface of the other side of the internal thread steel sleeve (2), ultrahigh-performance concrete is filled between the FRP pipe (1) and the internal thread steel sleeve (2) and inside the FRP pipe (1), a notch (9) is formed in the middle of the hollow bolt (12), an end face of the hollow bolt (12) is provided with an opening (13), the opening (13) is communicated with the notch (9), and the two ports of the notch (9) in the axial direction of the hollow bolt (12) are located in a gap between the FRP pipe (1) and the internal thread steel sleeve (2).
2. The reinforced internally threaded steel casing according to claim 1, characterized in that the number of hollow bolts (12) is two.
3. The reinforced internally threaded steel casing according to claim 2, characterized in that the two hollow bolts (12) are mounted in different directions.
4. An enhanced internally threaded steel casing according to claim 3, characterized in that the mounting directions of the two hollow bolts (12) are perpendicular to each other.
5. The reinforced internally threaded steel sleeve as claimed in claim 2, wherein the FRP pipe (1) has a pair of first reserved bolt holes (1-1) and a pair of second reserved bolt holes (1-2), and the internally threaded steel sleeve (2) has a pair of third reserved bolt holes (2-1) and a pair of fourth reserved bolt holes (2-2).
6. The reinforced internally threaded steel sleeve as recited in claim 1, wherein said ultra high performance concrete comprises cement, silica sand, silica fume, fly ash, mineral powder, steel fibers, water and water reducing agent in the following weight ratio: 10 to 50 percent of cement, 20 to 30 percent of quartz sand, 12 to 12.5 percent of silica fume, 0 to 35 percent of fly ash, 15 to 20 percent of mineral powder, 15 to 20 percent of water and 0.2 to 2.5 percent of water reducing agent, wherein the volume mixing amount of the steel fiber in the ultra-high performance concrete is 1.5 to 2.5 percent.
7. A truss joint, characterized in that the truss joint comprises a steel ball hinge (10) and a plurality of reinforced internally threaded steel casings according to any one of claims 1 to 6, one end of the plurality of reinforced internally threaded steel casings being in surface welded connection with the steel ball hinge (10).
8. The method of installing a truss node of claim 7, comprising the steps of:
the method comprises the following steps: cleaning the surface and the end part of the internal thread steel sleeve (2) by alcohol, drying the internal thread steel sleeve, and then welding the internal thread steel sleeve and the steel ball joint (10);
step two: cleaning the end part of the FRP pipe (1) by using alcohol, extending into the internal thread steel sleeve (2), calculating and determining the extending length according to the axial force borne by the FRP pipe (1) obtained by calculating the stress of a truss, and plugging the position, located at the position 5cm from the outer end section of the internal thread steel sleeve (2), of the outer surface of the FRP pipe (1) to the end face direction of the FRP pipe (1) by using epoxy resin;
step three: pressure grouting is conducted on ultra-high performance concrete from an opening (13) at the bottom of a transverse hollow bolt (12) far away from a steel ball hinge (10), grouting materials continuously flow, the grouting materials flow into an FRP pipe (1) through a notch (9) in the middle of the hollow bolt (12), gaps between the interior of the FRP pipe (1) and gaps between the FRP pipe (1) and an internal thread steel sleeve (2) are filled, when the ultra-high performance concrete overflows from the opening (13) at the bottom of an inverted vertical hollow bolt (12) close to the steel ball hinge (10), the fact that the pipe is filled with the ultra-high performance concrete at the moment is indicated, grouting is stopped, and hole sealing is leveled.
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| CN115506481A (en) * | 2022-08-26 | 2022-12-23 | 安徽省高迪循环经济产业园股份有限公司 | Steel pipe concrete structure, pouring method, concrete material and building |
| CN117868317A (en) * | 2024-02-29 | 2024-04-12 | 山东大学 | Hollow bolt ball internally filled steel fiber concrete grid connecting node and manufacturing method |
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