CN108252425B - Steel pipe confined concrete node structure, corresponding truss structure and construction method - Google Patents
Steel pipe confined concrete node structure, corresponding truss structure and construction method Download PDFInfo
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- CN108252425B CN108252425B CN201810262619.8A CN201810262619A CN108252425B CN 108252425 B CN108252425 B CN 108252425B CN 201810262619 A CN201810262619 A CN 201810262619A CN 108252425 B CN108252425 B CN 108252425B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 156
- 239000010959 steel Substances 0.000 title claims abstract description 156
- 239000004567 concrete Substances 0.000 title claims abstract description 74
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 21
- 238000005266 casting Methods 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000010705 motor oil Substances 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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
- E01D2101/20—Concrete, stone or stone-like material
-
- 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
- E01D2101/30—Metal
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to a steel pipe constraint concrete node structure which comprises chord members and web members, wherein the chord members and the web members comprise steel pipes and steel bar net racks, one ends of the steel bar net racks are embedded in the steel pipes through common concrete, the other ends of the steel bar net racks extend out of the steel pipes, the chord members and the web members are connected with each other through the external steel bar net racks, ultrahigh-performance concrete is poured at the connecting positions, the structure is simple, the bearing capacity is high, the construction is simpler, and the defect that steel pipes are fatigued due to welding of adjacent steel pipes at intersecting positions of steel pipe concrete truss nodes is overcome.
Description
Technical Field
The invention relates to a steel pipe confined concrete node structure, a corresponding truss structure and a construction method.
Background
The steel pipe concrete is a member formed by filling concrete into a steel pipe, and in general, the steel pipe and core concrete inside the steel pipe bear external loads together, so that the defects of the steel pipe and the concrete when used alone can be mutually compensated. Steel pipe concrete is often applied in truss form in large span space structures and bridges as a steel pipe concrete truss system, and a plane or space K, T, X, Y, N steel pipe concrete node is common, wherein a plurality of K-shaped nodes are most common in the truss structure. At the joint of the steel pipe concrete truss structure, on the intersecting line of branch and main pipe connection, as the geometric shape is suddenly changed, and the welding defect and the welding residual tensile stress between adjacent steel pipes at the joint exist, the stress concentration is very high near the joint intersecting line of the pipes, the occurrence and the development of fatigue cracks are easy to cause, and the resistance of the pipe joint and the whole truss structure to alternating loads is reduced. Under the action of daily fatigue load, the steel pipe concrete truss node is easy to crack, fatigue cracks originate from initial defects of a high-stress area, and near a hot spot, surface cracks are expanded and penetrate through the pipe wall, so that the node is damaged gradually, and the bearing capacity of the whole truss structure is lost.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the steel pipe confined concrete node structure, the corresponding truss structure and the construction method, which are simple in structure, convenient and efficient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a steel pipe constraint concrete node structure, includes chord member and web member, chord member and web member all include steel pipe and reinforcing bar rack, reinforcing bar rack's one end is all pre-buried in the steel pipe through ordinary concrete, the other end all extends the steel pipe outside, through outside reinforcing bar rack interconnect between chord member and the web member, the junction has pour ultra-high performance concrete.
Preferably, the steel bar net rack comprises a plurality of longitudinal bars, and the longitudinal bars are bound into a whole through a plurality of stirrups; the length of the embedded longitudinal bars in the steel pipes of the chord members is 2-3 times the diameter of the section of the concrete in the steel pipes of the chord members, and the length of the longitudinal bars extending out of the steel pipes is the length of the node main pipe; wherein the length of the embedded longitudinal ribs in the steel pipe of the web member is 2-3 times of the diameter of the section of the concrete in the steel pipe of the web member, and the length of the longitudinal ribs extending out of the steel pipe is the length of the node branch pipe; the anchoring length of the longitudinal ribs of the web members on the longitudinal ribs of the chord members is not less than 12 times of the diameter of the longitudinal ribs of the web members.
Preferably, the number of the chords and the web members is two, the two chords are located on the straight line where the node main pipe is located, the two web members are located on the inclined line where the node branch pipe is located, and the chords are connected with the reinforced net frame outside the web members and are poured into an inverted-K-shaped node structure through ultra-high-performance concrete.
The steel tube restrained concrete corresponding truss structure comprises a plurality of inverted K-shaped steel tube restrained concrete node structures, wherein chords of the steel tube restrained concrete node structures adjacent left and right are connected into an integral straight line shape, web members of the steel tube restrained concrete node structures adjacent upper and lower are connected into an integral diagonal shape, and the truss structure is composed of an upper chord member, a lower chord member and a plurality of wavy web members, wherein the upper chord member, the lower chord member and the plurality of wavy web members are arranged between the upper chord member and the lower chord member.
Preferably, steel pipes of chords of the steel pipe confined concrete node structure adjacent to the left and right are manufactured into a whole and are shared by the adjacent chords; the steel pipes of the web members of the upper and lower adjacent steel pipe restraining concrete node structures are manufactured into a whole and are shared by the adjacent web members.
The construction method of the steel pipe confined concrete node structure comprises the following steps: (1) The chord member and the web member part are transported to a construction site after pouring is completed; (2) Fixing the chord members and the web members at corresponding positions of the mold through a K-shaped UHPC cast-in-situ node mold, and casting UHPC into the mold through casting holes of the mold; (3) And (3) after curing for 28 days at normal temperature, removing the mould to form the steel pipe confined concrete node cast-in-situ by UHPC.
Preferably, in the step (1), when the chord member and the web member are manufactured, the longitudinal ribs are bound and fixed by stirrups, the bound positions are positioned at 1/3-1/2 of the pipe orifice of the steel pipe, the bound positions are placed in the steel pipe, ordinary concrete is poured in the steel pipe, the mould is removed after solidification, normal-temperature maintenance is carried out for 28 days, the cross section diameter of concrete in the chord member steel pipe with the length of the embedded longitudinal ribs being 2-3 times that of the chord member steel pipe, and the length of the longitudinal ribs extending out of the steel pipe is the length of the node main pipe; the length of the embedded longitudinal bars in the steel tube of the web member is 2-3 times of the diameter of the concrete section in the steel tube of the web member, the length of the longitudinal bars extending out of the steel tube is the length of the node branch tube, and the anchoring length of the longitudinal bars of the web member on the longitudinal bars of the chord member is not less than 12 times of the diameter of the longitudinal bars of the web member.
Preferably, in the step (2), the mold is composed of a left half steel mold of a "K" shape and a right half steel mold of a "K" shape, the left half steel mold and the right half steel mold are mutually screwed through bolts to form a hollow "K" mold, a casting hole leading to a node is formed in the periphery of the mold, and an exhaust through hole is formed in the periphery of the steel mold forming the node branch pipe; the pipe length of the die is larger than the lengths of the node main pipe and the node branch pipe.
Preferably, in step (2), a layer of engine oil is brushed on the inside of the mold for facilitating demolding.
Compared with the prior art, the invention has the following beneficial effects: (1) The bearing capacity is greatly improved, the plasticity is increased, and the mechanical property is reliable. (2) The joints do not need to weld adjacent steel pipes on site, but concrete connection is poured, so that the phenomenon of steel pipe fatigue caused by welding at the intersecting positions of the steel pipe concrete truss joints is avoided, cracks are generated, and the stress performance of the joints is influenced.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic construction diagram of a steel pipe confined concrete node structure.
Fig. 2 is a schematic view of the construction of a corresponding truss structure of steel pipe confined concrete.
Fig. 3 is a schematic view of the chord configuration.
Fig. 4 is a schematic view of the construction of the web member.
Fig. 5 is a schematic view of the construction of the left half steel mold.
Fig. 6 is a schematic view of the construction of the mold.
Fig. 7 is a schematic view of a mold in use.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-7, a steel pipe confined concrete node structure comprises a chord member 1 and a web member 2, wherein the chord member and the web member both comprise a steel pipe 3 and a steel bar net rack, one end of the steel bar net rack is embedded in the steel pipe through common concrete 4, the other end of the steel bar net rack extends out of the steel pipe, the chord member and the web member are connected with each other through external steel bar net racks, and ultra-high performance concrete 5 is poured at the joint.
In the embodiment of the invention, the steel bar net rack comprises a plurality of longitudinal bars 6, the longitudinal bars are bound into a whole through a plurality of stirrups 7, the joints are encrypted by the longitudinal bars and the stirrups, and the UHPC tension crack is reduced; the length of the embedded longitudinal bars in the steel pipes of the chord members is 2-3 times the diameter of the section of the concrete in the steel pipes of the chord members, and the length of the longitudinal bars extending out of the steel pipes is the length of the node main pipe; wherein the length of the embedded longitudinal ribs in the steel pipe of the web member is 2-3 times of the diameter of the section of the concrete in the steel pipe of the web member, and the length of the longitudinal ribs extending out of the steel pipe is the length of the node branch pipe; the anchoring length of the longitudinal ribs of the web members on the longitudinal ribs of the chord members is not less than 12 times of the diameter of the longitudinal ribs of the web members.
In the embodiment of the invention, the number of the chord members and the web members is two, the two chord members are positioned on the straight line where the node main pipe is positioned, the two web members are positioned on the inclined line where the node branch pipe is positioned, and the chord members are connected with the steel bar net frame outside the web members and are poured into an inverted K-shaped node structure through ultra-high performance concrete.
The steel tube restrained concrete corresponding truss structure comprises a plurality of inverted K-shaped steel tube restrained concrete node structures, wherein chords of the steel tube restrained concrete node structures adjacent left and right are connected into an integral straight line shape, web members of the steel tube restrained concrete node structures adjacent upper and lower are connected into an integral diagonal shape, and the truss structure is composed of an upper chord member, a lower chord member and a plurality of wavy web members, wherein the upper chord member, the lower chord member and the plurality of wavy web members are arranged between the upper chord member and the lower chord member.
In the embodiment of the invention, the steel pipes of the chords of the steel pipe constraint concrete node structure which are adjacent left and right are manufactured into a whole and are shared by the adjacent chords; the steel pipes of the web members of the upper and lower adjacent steel pipe restraining concrete node structures are manufactured into a whole and are shared by the adjacent web members.
The construction method of the steel pipe confined concrete node structure comprises the following steps: (1) The chord member and the web member part are transported to a construction site after pouring is completed; (2) Fixing the chord members and the web members at corresponding positions of the mold through a K-shaped UHPC cast-in-situ node mold 8, and casting UHPC into the mold through casting holes of the mold; (3) And after the UHPC is solidified after pouring is finished, curing for 28 days at normal temperature, removing the die to form the steel pipe confined concrete node cast-in-situ by adopting the UHPC.
In the embodiment of the invention, in the step (1), when the chord members and the web members are manufactured, the longitudinal bars are bound and fixed by stirrups, the bound positions are positioned at 1/3-1/2 of the pipe orifice of the steel pipe and are placed in the steel pipe, and the longitudinal bars and the stirrups are mainly used for reinforcing the binding between the steel pipe constraint concrete web members and the chord members and cast-in-situ UHPC nodes; pouring ordinary concrete in the steel pipe, removing the mould after solidification, and curing at normal temperature for 28 days, wherein the length of the embedded longitudinal bars in the steel pipe of the chord member is 2-3 times the section diameter of the concrete in the steel pipe of the chord member, and the length of the longitudinal bars extending out of the steel pipe is the length of the node main pipe; the length of the embedded longitudinal bars in the steel tube of the web member is 2-3 times of the diameter of the concrete section in the steel tube of the web member, the length of the longitudinal bars extending out of the steel tube is the length of the node branch tube, and the anchoring length of the longitudinal bars of the web member on the longitudinal bars of the chord member is not less than 12 times of the diameter of the longitudinal bars of the web member.
In the embodiment of the invention, in the step (2), a die is prefabricated according to the shape and the size of a crossing part of a K-shaped node of the steel pipe constraint concrete, the die consists of a left half steel die 9 and a right half steel die 10 which are identical in structure and are in a shape of a K, the left half steel die and the right half steel die are mutually connected in a threaded manner through bolts 11 to form a hollow K-shaped die, a pouring hole 13 leading to the node is formed in the periphery of the die, UHPC pouring is performed, an exhaust through hole 12 is formed in the periphery of the steel die forming a node branch pipe, gas in the die is conveniently discharged when UHPC is conveniently poured, and the die can be reused; the pipe length of the die is larger than the lengths of the node main pipe and the node branch pipe, so that the die is convenient to fix on the chord member and the web member.
In the embodiment of the invention, in the step (2), a layer of engine oil is brushed inside the die for facilitating demoulding.
The invention is not limited to the above-mentioned best mode, any person can obtain other various forms of steel pipe confined concrete node structures, corresponding truss structures and construction methods under the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (6)
1. The utility model provides a steel pipe constraint concrete node structure which characterized in that: the steel pipe and web member combined type concrete bridge comprises a chord member and a web member, wherein the chord member and the web member both comprise steel pipes and steel bar net racks, one ends of the steel bar net racks are embedded in the steel pipes through common concrete, the other ends of the steel bar net racks extend out of the steel pipes, the chord member and the web member are connected through the outer steel bar net racks, and ultra-high performance concrete is poured at the connection part; the steel bar net rack comprises a plurality of longitudinal bars, and the longitudinal bars are bound into a whole through a plurality of stirrups; the length of the embedded longitudinal bars in the steel pipes of the chord members is 2-3 times the diameter of the section of the concrete in the steel pipes of the chord members, and the length of the longitudinal bars extending out of the steel pipes is the length of the node main pipe; wherein the length of the embedded longitudinal ribs in the steel pipe of the web member is 2-3 times of the diameter of the section of the concrete in the steel pipe of the web member, and the length of the longitudinal ribs extending out of the steel pipe is the length of the node branch pipe; the anchoring length of the longitudinal ribs of the web members on the longitudinal ribs of the chord members is not less than 12 times of the diameter of the longitudinal ribs of the web members; the number of the chord members and the web members is two, the two chord members are positioned on a straight line where the node main pipe is positioned, the two web members are positioned on a diagonal where the node branch pipe is positioned, and the chord members are connected with a steel bar net rack outside the web members and are poured into an inverted K-shaped node structure through ultra-high performance concrete; the construction method of the steel pipe confined concrete node structure comprises the following steps: (1) The chord member and the web member part are transported to a construction site after pouring is completed; (2) Fixing the chord members and the web members at corresponding positions of the mold through a K-shaped UHPC cast-in-situ node mold, and casting UHPC into the mold through casting holes of the mold; (3) And (3) after curing for 28 days at normal temperature, removing the mould to form the steel pipe confined concrete node cast-in-situ by UHPC.
2. A steel pipe confined concrete node structure as claimed in claim 1, wherein: in the step (1), when the chord member and the web member are manufactured, binding and fixing longitudinal ribs by using stirrups, placing the binding positions at 1/3-1/2 of the pipe orifice of the steel pipe in the steel pipe, pouring common concrete in the steel pipe, removing a mold after solidification, curing at normal temperature for 28 days, wherein the cross section diameter of the concrete in the chord member steel pipe with the length of the pre-buried longitudinal ribs in the chord member steel pipe being 2-3 times, and the length of the longitudinal ribs extending out of the steel pipe are the length of the node main pipe; the length of the embedded longitudinal bars in the steel tube of the web member is 2-3 times of the diameter of the concrete section in the steel tube of the web member, the length of the longitudinal bars extending out of the steel tube is the length of the node branch tube, and the anchoring length of the longitudinal bars of the web member on the longitudinal bars of the chord member is not less than 12 times of the diameter of the longitudinal bars of the web member.
3. A steel pipe confined concrete node structure as claimed in claim 1, wherein: in the step (2), the die consists of a left half steel die of a K shape and a right half steel die of the K shape, the left half steel die and the right half steel die are mutually connected in a threaded manner through bolts to form a hollow K-shaped die, a pouring hole leading to a node is formed in the periphery of the die, and an exhaust through hole is formed in the periphery of the steel die forming a node branch pipe; the pipe length of the die is larger than the lengths of the node main pipe and the node branch pipe.
4. A steel pipe confined concrete node structure as claimed in claim 1, wherein: in the step (2), a layer of engine oil is brushed on the inside of the die for facilitating demoulding.
5. A steel pipe confined concrete corresponding truss structure, adopting the steel pipe confined concrete node structure as set forth in claim 1, characterized in that: the truss structure comprises a plurality of inverted-K-shaped steel tube confined concrete node structures, wherein chords of the steel tube confined concrete node structures which are adjacent left and right are connected into a straight line shape, web members of the steel tube confined concrete node structures which are adjacent up and down are connected into an integral diagonal shape, and the truss structure is composed of an upper chord member, a lower chord member and a plurality of wavy web members which are positioned between the upper chord member and the lower chord member and are parallel to each other.
6. The steel pipe confined concrete corresponding truss structure of claim 5, wherein: the steel pipes of the chords of the steel pipe constraint concrete node structures adjacent to each other on the left and right are manufactured into a whole and are shared by the adjacent chords; the steel pipes of the web members of the upper and lower adjacent steel pipe restraining concrete node structures are manufactured into a whole and are shared by the adjacent web members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262619.8A CN108252425B (en) | 2018-03-28 | 2018-03-28 | Steel pipe confined concrete node structure, corresponding truss structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262619.8A CN108252425B (en) | 2018-03-28 | 2018-03-28 | Steel pipe confined concrete node structure, corresponding truss structure and construction method |
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| CN108252425A CN108252425A (en) | 2018-07-06 |
| CN108252425B true CN108252425B (en) | 2023-12-08 |
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|---|---|---|---|---|
| CN110390165B (en) * | 2019-07-23 | 2021-03-30 | 福州大学 | Method for calculating stress concentration coefficient of concrete filled steel tube welding intersecting node |
| CN111719403B (en) * | 2020-08-04 | 2021-11-19 | 中建钢构江苏有限公司 | Bridge connecting device |
| CN112127266B (en) * | 2020-09-21 | 2024-09-06 | 华南理工大学 | FRP pipe-concrete-steel pipe double-pipe combined structure node and construction method thereof |
| CN112796415A (en) * | 2021-01-18 | 2021-05-14 | 清华大学 | Novel concrete-filled steel tube stiffening mixed structure and construction method thereof |
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| CN108252425A (en) | 2018-07-06 |
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