CN111155714A - Prefabricated steel pipe bundle part prestressed concrete beam and construction method thereof - Google Patents

Prefabricated steel pipe bundle part prestressed concrete beam and construction method thereof Download PDF

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Publication number
CN111155714A
CN111155714A CN202010064800.5A CN202010064800A CN111155714A CN 111155714 A CN111155714 A CN 111155714A CN 202010064800 A CN202010064800 A CN 202010064800A CN 111155714 A CN111155714 A CN 111155714A
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China
Prior art keywords
prestressed
steel
concrete
holes
anchoring
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CN202010064800.5A
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Chinese (zh)
Inventor
张玉芬
马国伟
曹胜昔
黄丽红
赵旭旺
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NORENDAR INTERNATIONAL Ltd
Hebei University of Technology
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NORENDAR INTERNATIONAL Ltd
Hebei University of Technology
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Application filed by NORENDAR INTERNATIONAL Ltd, Hebei University of Technology filed Critical NORENDAR INTERNATIONAL Ltd
Priority to CN202010064800.5A priority Critical patent/CN111155714A/en
Publication of CN111155714A publication Critical patent/CN111155714A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08Members specially adapted to be used in prestressed constructions

Abstract

The invention discloses a prefabricated steel tube bundle part prestressed concrete beam and a construction method thereof. The beam comprises a hollow lattice type steel pipe bundle, concrete, prestressed steel bars, baffles and anchoring steel bars; the baffle plates are fixed at two ends inside the hollow lattice type steel pipe bundle; the lowest layer of the baffle of the lowest steel member is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes; the other baffles are provided with a plurality of layers, and each layer is provided with a plurality of preformed holes; the prestressed reinforcement is arranged in the prestressed reinforcement hole in a sliding manner and penetrates through the whole beam; loading prestressed reinforcement to control stress and anchoring; inserting the anchoring steel bar into the preformed hole and fixing; and pouring concrete between the baffles, and releasing the prestress after the strength requirement is met to form the steel pipe bundle part prestressed concrete beam. The beam has the advantages of a steel reinforced concrete structure and a prestressed concrete structure, the anti-seismic performance and the anti-deformation capacity of the beam are improved, the bearing capacity is high, the later bearing capacity is stable, and the structural rigidity is greatly improved.

Description

Prefabricated steel pipe bundle part prestressed concrete beam and construction method thereof
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a prefabricated steel tube bundle part prestressed concrete beam and a construction method thereof.
Background
The existing steel pipe bundle concrete composite structure is mainly applied to a shear wall structure system at present, and the structure has many limitations, such as difficult hole opening, limited door and window arrangement, high steel consumption, large processing amount, large installation workload, high construction cost, larger design difficulty, unfavorable earthquake resistance and unfavorable popularization and application of the steel pipe bundle concrete composite structure in a multi-story building and a low earthquake intensity area.
In order to solve the defects, a steel pipe bundle concrete wall type frame structure is adopted, and lattice steel pipe bundle concrete structure forms are adopted for wall columns and connecting beams. The steel pipe bundle concrete beam is a lattice type steel pipe bundle concrete horizontal component which is designed to be a straight-line-shaped upper-layer opening by changing a steel pipe bundle concrete structure from a vertical component to a horizontal component. Compared with a cast-in-place reinforced concrete beam, the steel tube bundle concrete beam has no processes of binding steel bars, supporting a formwork, removing the formwork and the like, is simple and convenient to construct, is more convenient to pour concrete, and can accelerate the construction speed. Compared with a prefabricated reinforced concrete beam member, the structure is generally simpler, the welding seams are fewer, the manufacturing is easier, the connecting nodes can be converted into steel member connection, the construction is convenient and fast, and the connection is firm. In addition, combined with the measure of prestressed concrete, the steel consumption and the section size of the member can be reduced, steel and concrete are saved, the self weight of the structure is reduced, the structural rigidity is increased, the structural deformation is reduced, and the applicable span of the structure is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing a prefabricated steel tube bundle part prestressed concrete beam and a construction method thereof.
The technical scheme for solving the technical problem of the beam is to provide a prefabricated steel tube bundle partial prestressed concrete beam which is characterized by comprising a hollow lattice type steel tube bundle, concrete, prestressed reinforcements, baffles and anchoring reinforcements;
the hollow lattice type steel pipe bundle consists of a plurality of steel members to form a straight-line structure; the baffle plates are fixed at two ends inside the hollow lattice type steel pipe bundle; the lowest layer of the baffle inside the lowest steel member is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes; the other baffles are provided with a plurality of layers, and each layer is provided with a plurality of preformed holes; the prestressed reinforcement is arranged in the prestressed reinforcement hole and penetrates through the whole beam, and the prestressed reinforcement is in clearance fit with the prestressed reinforcement hole; loading the prestressed reinforcement to control stress and anchoring by using a temporary clamp; the anchoring steel bar is inserted into the preformed hole and fixed in the preformed hole of the baffle; and pouring concrete between the baffles in the hollow lattice type steel pipe bundle, and after the concrete meets the strength requirement, removing the anchoring of the temporary fixture to the prestressed reinforcement to form the steel pipe bundle part prestressed concrete beam.
The technical scheme for solving the technical problem of the construction method is to provide a construction method of a prefabricated steel tube bundle part prestressed concrete beam, which is characterized by comprising the following steps of:
step 1, respectively welding and fixing two baffles at two ends inside a steel member; the lowest layer of the baffle is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes;
step 2, inserting prestressed reinforcements into the prestressed reinforcement holes of the baffle and penetrating through the whole beam, wherein the prestressed reinforcements can freely stretch and retract in the prestressed reinforcement holes; stretching the prestressed reinforcement to a control stress required by engineering design, and then anchoring by using a temporary clamp; inserting anchoring steel bars into the preformed holes of the baffle plates and then welding the anchoring steel bars into the preformed holes;
step 3, pouring concrete between the baffles, and after the strength of the concrete reaches the design specified strength, releasing the anchoring of the temporary fixture to the prestressed reinforcement and releasing the control stress of the prestressed reinforcement;
and 4, welding a plurality of steel members on the one steel member to form a straight-line structure, so as to obtain the partially prestressed concrete beam of the prefabricated steel pipe bundle.
A construction method of a prefabricated steel tube bundle part prestressed concrete beam is characterized by comprising the following steps:
step 1, welding a plurality of steel members into a straight-line-shaped hollow lattice type steel pipe bundle;
step 2, welding and fixing the baffle plates at two ends inside the hollow lattice type steel pipe bundle; the lowest layer of the baffle inside the lowest steel member is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes; the other baffles are provided with a plurality of layers, and each layer is provided with a plurality of preformed holes;
step 3, inserting prestressed reinforcements into the prestressed reinforcement holes of the baffle and penetrating through the whole beam, wherein the prestressed reinforcements can freely stretch and retract in the prestressed reinforcement holes; stretching the prestressed reinforcement to a control stress required by engineering design, and then anchoring by using a temporary clamp; inserting anchoring steel bars into the preformed holes of the baffle plates and then welding the anchoring steel bars into the preformed holes;
and 4, pouring concrete between the baffles in the hollow lattice type steel pipe bundle, after the strength of the concrete reaches the design specified strength, releasing the anchoring of the temporary fixture to the prestressed reinforcement, and releasing the control stress of the prestressed reinforcement to form the partially prestressed concrete beam of the prefabricated steel pipe bundle.
Compared with the prior art, the invention has the beneficial effects that:
(1) the beam has the advantages of both a steel reinforced concrete structure and a prestressed concrete structure, improves the anti-seismic performance and the anti-deformation capacity of the beam, has high bearing capacity and stable later bearing capacity, can greatly improve the structural rigidity, reduces the structural deformation, and can be applied to structures with large span.
(2) Except the concrete with partial prestress, the rest concrete can be selected to be cast in situ after being installed in the hollow lattice type steel pipe bundle, so that the dead weight of the combined beam in the transportation and hoisting processes can be reduced, and the advantages of factory prefabrication, construction assembly, material recovery and the like are realized. The design of partial prestress can reduce the beam deflection of the beam positive bending moment area and delay the risk of concrete cracking, the steel tube bundle concrete is combined with the prestress technology, the internal force of a component can be adjusted and optimized, the stress is more reasonable and reliable, the design requirement of the bearing capacity is ensured, the section area can be reduced, and the cost is saved.
(3) The hollow lattice type steel pipe bundle can bear a stressed component and can be directly used as a template, a prefabricated steel pipe bundle part prestressed concrete beam is obtained after prestressed concrete is poured in a factory, the beam is transported to the site for installation, and after the beam is connected to other main structures such as a beam upper structure or a vertical bearing component and the like through reserved installation holes or pre-buried anchoring parts at the upper end and two sides of the hollow lattice type steel pipe bundle, concrete is integrally poured in the site, so that the construction speed is accelerated, and meanwhile, the reliability and the safety of node connection can be realized.
(4) The invention avoids the defects of poor stability of steel members, and quick concrete brittleness and rigidity degradation, and has the advantages of high bearing capacity, good anti-seismic performance, simple construction, short construction period, high speed and the like.
(5) The invention applies prestress to the steel bar to directly participate in structural stress, fully exerts the material performance of the steel tube bundle and the steel bar and effectively improves the stress state of the concrete beam.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of example 1 of the present invention;
FIG. 2 is an overall plan view of embodiment 1 of the present invention;
FIG. 3 is a schematic longitudinal cross-sectional view of example 2 of the present invention;
FIG. 4 is a schematic transverse cross-sectional view of example 2 of the present invention; the figure shows a baffle plate which is not integrally communicated;
FIG. 5 is a schematic cross-sectional view of example 3 of the present invention; the figure shows a baffle plate which is integrally communicated;
FIG. 6 is a schematic longitudinal sectional top view of the lowest steel member of the present invention;
FIG. 7 is a schematic structural diagram of a baffle plate of a lowest steel member of the invention;
fig. 8 is a schematic structural view of a baffle plate of a non-lowest steel member according to the present invention.
In the figure: 1. hollow lattice steel tube bundles; 2. concrete; 3. pre-stressing the steel bars; 4. a through hole; 5. a baffle plate; 6. reserving a hole; 7. pre-stress rib holes; 8. and anchoring the steel bars.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a precast steel tube bundle partial prestressed concrete beam (called beam for short), which is characterized by comprising a hollow lattice type steel tube bundle 1, concrete 2, prestressed reinforcement 3, a baffle 5 and anchoring reinforcement 8;
the hollow lattice type steel pipe bundle 1 is formed by welding a plurality of steel members to form a straight-line structure; the baffle plates 5 are welded (preferably symmetrically welded) and fixed at two ends inside the hollow lattice type steel pipe bundle 1; the lowest layer of the baffle 5 in the lowest steel member is provided with a plurality of prestressed rib holes 7, and the other layers are provided with a plurality of reserved holes 6; the other baffles 5 are provided with a plurality of layers and a plurality of preformed holes 6 on each layer; the prestressed reinforcement 3 is arranged in the prestressed reinforcement hole 7 and penetrates through the whole beam, the prestressed reinforcement 3 is in clearance fit with the prestressed reinforcement hole 7, and the prestressed reinforcement 3 can freely stretch and retract in the prestressed reinforcement hole 7; the prestressed reinforcement 3 is loaded by a tensioning machine to control stress and is anchored by a temporary clamp; the anchoring steel bar 8 is inserted into the preformed hole 6 to a certain depth and is welded and fixed in the preformed hole 6 of the baffle 5; and (3) pouring concrete 2 between the baffles 5 in the hollow lattice type steel pipe bundle 1, after the concrete meets a certain strength requirement, releasing the anchoring of the temporary fixture to the prestressed reinforcement 3, and further releasing the control stress of the prestressed reinforcement 3 to form the steel pipe bundle part prestressed concrete beam.
The hollow lattice type steel pipe bundle 1 is formed by welding 2-4 steel members by a conventional process to form a linear structure, and a through hole penetrating through the middle steel plate is used for later concrete pouring and compacting; mounting holes or pre-buried anchoring parts are reserved at the upper end and two sides of the hollow lattice type steel pipe bundle 1; an opening is arranged at the upper end of the topmost steel member; the inner wall of the lowest steel member is smooth, so that the requirement for shrinkage of prestressed concrete can be met; the steel member is rectangular steel, C (U) section steel or I (H) section steel, and is made of common steel, light steel or high-strength steel.
The concrete 2 is common concrete, high-strength concrete or self-compacting concrete.
The number of the prestressed rib holes 7, the number of layers of the preformed holes 6 and the number of the preformed holes 6 in each layer are determined according to engineering design requirements; the depth of the anchoring steel bar 8 inserted into the preformed hole 6 and the size of the control tension set by the prestressed steel bar 3 are determined according to the engineering design requirements.
Preferably, the baffle 5 is welded and fixed at both ends inside the lowest steel member of the hollow lattice type steel pipe bundle 1 or welded and fixed at both ends inside each steel member of the hollow lattice type steel pipe bundle 1; when the baffles 5 are welded and fixed to the two ends of each steel member of the hollow lattice type steel pipe bundle 1, one baffle 5 may be welded to each of the two ends of each steel member (as shown in fig. 4), or one baffle 5 may be welded to each of the two ends of each steel member of the hollow lattice type steel pipe bundle 1 (as shown in fig. 5) after the through grooves are formed in all the intermediate steel plates of the hollow lattice type steel pipe bundle 1.
The anchoring reinforcing steel bars 8 are stressed reinforcing steel bars during node connection and need to be fixed well before concrete pouring.
The invention also provides a construction method (construction method for short) of the precast steel tube bundle part prestressed concrete beam, which is characterized by comprising the following steps:
the construction method comprises the following steps:
step 1, respectively welding (preferably symmetrically welding) two baffles 5 at two ends of the interior of a steel member; the lowest layer of the baffle 5 is provided with a plurality of prestressed rib holes 7, and the other layers are provided with a plurality of preformed holes 6;
step 2, inserting prestressed reinforcements 3 into prestressed reinforcement holes 7 of the baffle 5 and penetrating through the whole beam, wherein the prestressed reinforcements 3 are in clearance fit with the prestressed reinforcement holes 7, and the prestressed reinforcements 3 can freely stretch and retract in the prestressed reinforcement holes 7; stretching the prestressed reinforcement 3 on a factory pedestal to a control stress required by engineering design through a stretching machine, and then anchoring by using a temporary fixture; after inserting anchoring steel bars 8 into the preformed holes 6 of the baffle 5, welding the anchoring steel bars into the preformed holes 6;
step 3, pouring concrete 2 between the baffles 5, and after the concrete strength reaches the design specified strength or is not lower than 75% of the designed concrete strength grade value when the design is not specified, releasing the anchoring of the temporary clamp to the prestressed reinforcement 3 and releasing the control stress (namely the prestress) of the prestressed reinforcement 3;
and 4, after the steps are finished, welding a plurality of steel members (preferably 1-3) on the one steel member to form a straight-line structure, and obtaining the prefabricated steel pipe bundle partially prestressed concrete beam.
The second construction method comprises the following steps:
step 1, welding a plurality of (preferably 2-4) steel members into a straight-line hollow lattice type steel pipe bundle 1;
step 2, welding (preferably symmetrically welding) the baffle plates 5 at two ends inside the hollow lattice type steel pipe bundle 1; the lowest layer of the baffle 5 in the lowest steel member is provided with a plurality of prestressed rib holes 7, and the other layers are provided with a plurality of reserved holes 6; the other baffles 5 are provided with a plurality of layers and a plurality of preformed holes 6 on each layer;
step 3, inserting prestressed reinforcements 3 into prestressed reinforcement holes 7 of the baffle 5 and penetrating through the whole beam, wherein the prestressed reinforcements 3 are in clearance fit with the prestressed reinforcement holes 7, and the prestressed reinforcements 3 can freely stretch and retract in the prestressed reinforcement holes 7; stretching the prestressed reinforcement 3 on a factory pedestal to a control stress required by engineering design through a stretching machine, and then anchoring by using a temporary fixture; after inserting anchoring steel bars 8 into the preformed holes 6 of the baffle 5, welding the anchoring steel bars into the preformed holes 6;
and 4, pouring concrete 2 between the baffles 5 in the hollow lattice type steel pipe bundle 1, after the strength of the concrete reaches the strength specified by the design or is not lower than 75% of the grade value of the designed concrete strength when the design is not specified, releasing the anchoring of the temporary clamp to the prestressed reinforcement 3, releasing the control stress (namely the prestress) of the prestressed reinforcement 3, and forming the prestressed concrete beam of the prefabricated steel pipe bundle part.
The first construction method and the second construction method both further comprise the following steps: and (3) transporting the prefabricated steel tube bundle part prestressed concrete beam obtained in the step (4) to a field for installation, and after the beam is connected to other main structures such as beam upper structures or vertical bearing members (such as fabricated structural floor slabs, wall beam nodes and beam column nodes), the internal space of the hollow lattice type steel tube bundle 1 outside the baffle plate 5 can be cast with other main structures together, so that the reliability and the safety of node connection can be realized.
Example 1
The hollow lattice type steel pipe bundle 1 is formed by welding 2 steel members to form a straight-line structure; the baffles 5 are symmetrically welded and fixed at two ends of the inner part of the lowest steel member, and the baffle 5 is not arranged on the other steel member, as shown in the figure 1-2;
the construction method comprises the following steps:
step 1, symmetrically welding and fixing two baffles 5 at two ends inside a steel member; the lowest layer of the baffle 5 is provided with 2 prestressed rib holes 7, and the second layer is provided with 2 preformed holes 6;
step 2, inserting prestressed reinforcements 3 into prestressed reinforcement holes 7 of the baffle 5 and penetrating through the whole beam, wherein the prestressed reinforcements 3 are in clearance fit with the prestressed reinforcement holes 7, and the prestressed reinforcements 3 can freely stretch and retract in the prestressed reinforcement holes 7; stretching the prestressed reinforcement 3 on the pedestal to a control stress required by engineering design through a stretching machine, and then anchoring by using a temporary fixture; after inserting anchoring steel bars 8 into the preformed holes 6 of the baffle 5, welding the anchoring steel bars into the preformed holes 6;
step 3, pouring concrete 2 between the baffles 5, and after the concrete strength reaches the design specified strength or is not lower than 75% of the designed concrete strength grade value when the design is not specified, releasing the anchoring of the temporary clamp to the prestressed reinforcement 3 and releasing the control stress (namely the prestress) of the prestressed reinforcement 3;
and 4, welding 1 steel member on the one steel member to form a straight-line structure, and obtaining the prefabricated steel pipe bundle part prestressed concrete beam.
Example 2
The hollow lattice type steel pipe bundle 1 is formed by welding 2 steel members to form a straight-line structure; the baffles 5 are symmetrically welded and fixed at two ends inside each steel member of the hollow lattice type steel pipe bundle 1, and one baffle 5 is welded at two ends inside each steel member respectively as shown in figures 3-4;
step 1, welding 2 steel members into a straight-line-shaped hollow lattice type steel pipe bundle 1;
step 2, welding and fixing four baffles 5 at two ends inside two layers of steel members of the hollow lattice type steel pipe bundle 1; the lowest layer of the baffle 5 in the lowest steel member is provided with 2 prestressed rib holes 7, and the second layer is provided with 2 preformed holes 6; the baffle 5 in the second layer of steel members is provided with 2 layers of 2 preformed holes 6 in each layer;
step 3, inserting prestressed reinforcements 3 into prestressed reinforcement holes 7 of the baffle 5 and penetrating through the whole beam, wherein the prestressed reinforcements 3 are in clearance fit with the prestressed reinforcement holes 7, and the prestressed reinforcements 3 can freely stretch and retract in the prestressed reinforcement holes 7; stretching the prestressed reinforcement 3 on the pedestal to a control stress required by engineering design through a stretching machine, and then anchoring by using a temporary fixture; after inserting anchoring steel bars 8 into the preformed holes 6 of the baffle 5, welding the anchoring steel bars into the preformed holes 6;
and 4, pouring concrete 2 between the baffles 5 in the hollow lattice type steel pipe bundle 1, after the strength of the concrete reaches the strength specified by the design or is not lower than 75% of the grade value of the designed concrete strength when the design is not specified, releasing the anchoring of the temporary clamp to the prestressed reinforcement 3, releasing the control stress (namely the prestress) of the prestressed reinforcement 3, and forming the prestressed concrete beam of the prefabricated steel pipe bundle part.
Example 3
The hollow lattice type steel pipe bundle 1 is formed by welding 2 steel members to form a straight-line structure; the baffle plates 5 are symmetrically welded and fixed at two ends inside each steel member of the hollow lattice type steel pipe bundle 1, after through grooves are formed in all middle steel plates of the hollow lattice type steel pipe bundle 1 in a penetrating mode, the baffle plates 5 are welded at two ends inside all the steel members of the whole hollow lattice type steel pipe bundle 1 respectively, and the structure is shown in figure 5;
step 1, welding 2 steel members into a straight-line-shaped hollow lattice type steel pipe bundle 1;
step 2, after the two baffle plates 5 are respectively inserted into the through grooves penetrating through all the middle steel plates, the two baffle plates are welded and fixed at two ends inside the two layers of steel members of the hollow lattice type steel pipe bundle 1; the lowest layer of the baffle 5 in the lowest steel member is provided with 2 prestressed rib holes 7, and the second layer is provided with 2 preformed holes 6; the baffle 5 in the second layer of steel members is provided with 2 layers of 2 preformed holes 6 in each layer;
step 3, inserting prestressed reinforcements 3 into prestressed reinforcement holes 7 of the baffle 5 and penetrating through the whole beam, wherein the prestressed reinforcements 3 are in clearance fit with the prestressed reinforcement holes 7, and the prestressed reinforcements 3 can freely stretch and retract in the prestressed reinforcement holes 7; stretching the prestressed reinforcement 3 on the pedestal to a control stress required by engineering design through a stretching machine, and then anchoring by using a temporary fixture; after inserting anchoring steel bars 8 into the preformed holes 6 of the baffle 5, welding the anchoring steel bars into the preformed holes 6;
and 4, pouring concrete 2 between the baffles 5 in the hollow lattice type steel pipe bundle 1, after the strength of the concrete reaches the strength specified by the design or is not lower than 75% of the grade value of the designed concrete strength when the design is not specified, releasing the anchoring of the temporary clamp to the prestressed reinforcement 3, releasing the control stress (namely the prestress) of the prestressed reinforcement 3, and forming the prestressed concrete beam of the prefabricated steel pipe bundle part.
Nothing in this specification is said to apply to the prior art.

Claims (9)

1. A prefabricated steel tube bundle partial prestressed concrete beam is characterized in that the beam comprises a hollow lattice type steel tube bundle, concrete, prestressed steel bars, baffles and anchoring steel bars;
the hollow lattice type steel pipe bundle consists of a plurality of steel members to form a straight-line structure; the baffle plates are fixed at two ends inside the hollow lattice type steel pipe bundle; the lowest layer of the baffle inside the lowest steel member is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes; the other baffles are provided with a plurality of layers, and each layer is provided with a plurality of preformed holes; the prestressed reinforcement is arranged in the prestressed reinforcement hole and penetrates through the whole beam, and the prestressed reinforcement is in clearance fit with the prestressed reinforcement hole; loading the prestressed reinforcement to control stress and anchoring by using a temporary clamp; the anchoring steel bar is inserted into the preformed hole and fixed in the preformed hole of the baffle; and pouring concrete between the baffles in the hollow lattice type steel pipe bundle, and after the concrete meets the strength requirement, removing the anchoring of the temporary fixture to the prestressed reinforcement to form the steel pipe bundle part prestressed concrete beam.
2. The partially prestressed concrete girder of prefabricated steel tube bundle according to claim 1, wherein the baffles are symmetrically welded and fixed to both ends of the inside of the hollow lattice type steel tube bundle.
3. The precast steel tube bundle partially prestressed concrete beam according to claim 1 or 2, wherein the baffle is welded and fixed to both ends of the inside of the lowermost steel member of the hollow lattice type steel tube bundle or both ends of the inside of each steel member of the hollow lattice type steel tube bundle.
4. The precast steel tube bundle partially prestressed concrete girder according to claim 1, wherein the hollow lattice type steel tube bundle is welded by 2-4 steel members, and the middle steel plate is provided with a through hole therethrough; mounting holes or pre-buried anchoring parts are reserved at the upper end and two sides of the hollow lattice type steel pipe bundle; an opening is arranged at the upper end of the topmost steel member; the inner wall of the lowest steel member is smooth, and the requirement for shrinkage of prestressed concrete can be met.
5. The precast steel tube bundle partially prestressed concrete girder according to claim 4, wherein the steel member is rectangular steel, C-shaped steel or I-shaped steel, and general steel, light steel or high strength steel is used.
6. The precast steel tube bundle partially prestressed concrete beam according to claim 1, wherein said concrete is general concrete, high strength concrete or self-compacting concrete.
7. A construction method of a precast steel tube bundle partially prestressed concrete girder according to any one of claims 1 to 6, which comprises the steps of:
step 1, respectively welding and fixing two baffles at two ends inside a steel member; the lowest layer of the baffle is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes;
step 2, inserting prestressed reinforcements into the prestressed reinforcement holes of the baffle and penetrating through the whole beam, wherein the prestressed reinforcements can freely stretch and retract in the prestressed reinforcement holes; stretching the prestressed reinforcement to a control stress required by engineering design, and then anchoring by using a temporary clamp; inserting anchoring steel bars into the preformed holes of the baffle plates and then welding the anchoring steel bars into the preformed holes;
step 3, pouring concrete between the baffles, and after the strength of the concrete reaches the design specified strength, releasing the anchoring of the temporary fixture to the prestressed reinforcement and releasing the control stress of the prestressed reinforcement;
and 4, welding a plurality of steel members on the one steel member to form a straight-line structure, so as to obtain the partially prestressed concrete beam of the prefabricated steel pipe bundle.
8. A construction method of a precast steel tube bundle partially prestressed concrete girder according to any one of claims 1 to 6, which comprises the steps of:
step 1, welding a plurality of steel members into a straight-line-shaped hollow lattice type steel pipe bundle;
step 2, welding and fixing the baffle plates at two ends inside the hollow lattice type steel pipe bundle; the lowest layer of the baffle inside the lowest steel member is provided with a plurality of prestressed rib holes, and the other layers are provided with a plurality of reserved holes; the other baffles are provided with a plurality of layers, and each layer is provided with a plurality of preformed holes;
step 3, inserting prestressed reinforcements into the prestressed reinforcement holes of the baffle and penetrating through the whole beam, wherein the prestressed reinforcements can freely stretch and retract in the prestressed reinforcement holes; stretching the prestressed reinforcement to a control stress required by engineering design, and then anchoring by using a temporary clamp; inserting anchoring steel bars into the preformed holes of the baffle plates and then welding the anchoring steel bars into the preformed holes;
and 4, pouring concrete between the baffles in the hollow lattice type steel pipe bundle, after the strength of the concrete reaches the design specified strength, releasing the anchoring of the temporary fixture to the prestressed reinforcement, and releasing the control stress of the prestressed reinforcement to form the partially prestressed concrete beam of the prefabricated steel pipe bundle.
9. The construction method of the precast steel tube bundle partially prestressed concrete girder as recited in claim 7 or 8, wherein the construction method further comprises the steps of: transporting the precast steel tube bundle part of the prestressed concrete beam obtained in the step 4) to a field for installation and connecting the precast steel tube bundle part of the prestressed concrete beam to other main structures; the concrete is poured together with other main body structures in the inner space of the hollow lattice type steel pipe bundle outside the baffle.
CN202010064800.5A 2020-01-20 2020-01-20 Prefabricated steel pipe bundle part prestressed concrete beam and construction method thereof Pending CN111155714A (en)

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Publication number Priority date Publication date Assignee Title
CN110258921A (en) * 2019-07-22 2019-09-20 江苏苏阳建设有限公司 Steel and concrete combined beam
CN111560836A (en) * 2020-05-20 2020-08-21 河北工业大学 Construction method of arch bridge main arch and construction method of assembled arch bridge

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