CN111155714A - A kind of prefabricated steel tube bundle partially prestressed concrete beam and its construction method - Google Patents

A kind of prefabricated steel tube bundle partially prestressed concrete beam and its construction method 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
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prestressed
steel
concrete
tube bundle
steel tube
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张玉芬
马国伟
曹胜昔
黄丽红
赵旭旺
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NORENDAR INTERNATIONAL Ltd
Yanshan University
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NORENDAR INTERNATIONAL Ltd
Hebei University of Technology
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Priority to CN202010064800.5A priority Critical patent/CN111155714A/en
Publication of CN111155714A publication Critical patent/CN111155714A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Rod-Shaped Construction Members (AREA)

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)

1.一种预制钢管束部分预应力混凝土梁，其特征在于该梁包括空心格构式钢管束、混凝土、预应力钢筋、挡板和锚固钢筋；1. a prefabricated steel tube bundle part prestressed concrete beam, it is characterized in that this beam comprises hollow lattice type steel tube bundle, concrete, prestressed steel bar, baffle plate and anchoring steel bar; 所述空心格构式钢管束由若干榀钢构件组成，形成一字型结构；挡板固定于空心格构式钢管束内部的两端；最下层一榀钢构件内部的挡板的最下一层设置有若干个预应力筋孔，其他层设置有若干个预留孔；其他挡板设置有若干层、每层若干个预留孔；预应力钢筋设置于预应力筋孔中并贯穿整个梁，预应力钢筋与预应力筋孔间隙配合；预应力钢筋加载控制应力并用临时夹具锚固；锚固钢筋插入预留孔中并固定于挡板的预留孔中；在空心格构式钢管束内部的挡板之间浇筑混凝土，待混凝土达到强度要求后，解除临时夹具对预应力钢筋的锚固，形成钢管束部分预应力混凝土梁。The hollow lattice steel tube bundle is composed of a number of steel members to form an in-line structure; baffles are fixed at both ends inside the hollow lattice steel tube bundle; A number of prestressed rib holes are arranged on one layer, and a number of reserved holes are arranged in other layers; other baffles are arranged with several layers and several reserved holes in each layer; prestressed reinforcement bars are arranged in the prestressed rib holes and penetrate the entire beam , the prestressed steel bar is matched with the prestressed reinforcement hole; the prestressed steel bar is loaded to control the stress and anchored with a temporary fixture; the anchoring steel bar is inserted into the reserved hole and fixed in the reserved hole of the baffle; Concrete is poured between the baffles, and after the concrete reaches the strength requirements, the anchorage of the prestressed steel bars by the temporary fixture is released to form part of the prestressed concrete beam of the steel tube bundle. 2.根据权利要求1所述的预制钢管束部分预应力混凝土梁，其特征在于挡板对称焊接固定于空心格构式钢管束内部的两端。2 . The partially prestressed concrete beam of the prefabricated steel tube bundle according to claim 1 , wherein the baffle plates are symmetrically welded and fixed to both ends inside the hollow lattice steel tube bundle. 3 . 3.根据权利要求1或2所述的预制钢管束部分预应力混凝土梁，其特征在于所述挡板焊接固定于空心格构式钢管束的最下层一榀钢构件内部的两端或焊接固定于空心格构式钢管束的每榀钢构件内部的两端。3. The prefabricated steel tube bundle part prestressed concrete beam according to claim 1 or 2 is characterized in that the baffle plate is welded and fixed to the inner two ends of the innermost layer of a steel member of the hollow lattice steel tube bundle or is fixed by welding Both ends inside each steel member of the hollow lattice steel tube bundle. 4.根据权利要求1所述的预制钢管束部分预应力混凝土梁，其特征在于所述空心格构式钢管束由2-4榀钢构件焊接而成，中间钢板设置有贯穿的通孔；空心格构式钢管束的上端和两侧均预留安装孔或预埋锚固件；最上层一榀钢构件的上端开口；最下层一榀钢构件内壁光滑，可满足预应力混凝土收缩需求。4. The prefabricated steel tube bundle part prestressed concrete beam according to claim 1 is characterized in that the hollow lattice type steel tube bundle is welded by 2-4 steel members, and the intermediate steel plate is provided with a through hole; The upper end and both sides of the lattice steel tube bundle are reserved for installation holes or pre-embedded anchors; the upper end of the uppermost steel member is open; the inner wall of the lowermost steel member is smooth, which can meet the shrinkage requirements of prestressed concrete. 5.根据权利要求4所述的预制钢管束部分预应力混凝土梁，其特征在于所述钢构件为矩形钢、C型钢或工字型钢，采用普通钢材、轻钢钢材或高强钢材。5 . The prefabricated steel tube bundle part prestressed concrete beam according to claim 4 , wherein the steel members are rectangular steel, C-shaped steel or I-shaped steel, and common steel, light steel steel or high-strength steel are used. 6 . 6.根据权利要求1所述的预制钢管束部分预应力混凝土梁，其特征在于所述混凝土为普通混凝土、高强混凝土或自密实混凝土。6 . The partially prestressed concrete beam of prefabricated steel tube bundles according to claim 1 , wherein the concrete is ordinary concrete, high-strength concrete or self-compacting concrete. 7 . 7.一种权利要求1-6任一所述的预制钢管束部分预应力混凝土梁的施工方法，其特征在于该施工方法包括以下步骤：7. a construction method of the prefabricated steel tube bundle part prestressed concrete beam described in any one of claim 1-6, is characterized in that this construction method comprises the following steps: 步骤1、将两块挡板分别焊接固定在一榀钢构件内部的两端；所述挡板的最下一层设置有若干个预应力筋孔，其他层设置有若干个预留孔；Step 1. Welding and fixing two baffles at both ends inside a steel member; the bottom layer of the baffle is provided with a number of prestressed rib holes, and the other layers are provided with a number of reserved holes; 步骤2、在挡板的预应力筋孔中插入预应力钢筋并贯穿整个梁，预应力钢筋在预应力筋孔中能够自由伸缩；将预应力钢筋张拉至工程设计要求的控制应力后，用临时夹具锚固；在挡板的预留孔中插入锚固钢筋后焊接于预留孔中；Step 2. Insert the prestressed steel bar into the prestressed reinforcement hole of the baffle plate and run through the whole beam. The prestressed steel bar can expand and contract freely in the prestressed reinforcement hole; after the prestressed steel bar is stretched to the control stress required by the engineering design, use Temporary fixture anchoring; insert anchoring steel bars in the reserved holes of the baffle plate and then weld them in the reserved holes; 步骤3、在挡板间浇筑混凝土，待混凝土强度达到设计规定强度后，解除临时夹具对预应力钢筋的锚固，释放预应力钢筋的控制应力；Step 3. Concrete is poured between the baffles, and after the strength of the concrete reaches the design specified strength, the anchoring of the prestressed steel bar by the temporary fixture is released, and the control stress of the prestressed steel bar is released; 步骤4、在此一榀钢构件上焊接若干榀钢构件，形成一字型结构，得到预制钢管束部分预应力混凝土梁。Step 4: Weld several steel members on this one steel member to form a straight-line structure to obtain a partially prestressed concrete beam of prefabricated steel tube bundles. 8.一种权利要求1-6任一所述的预制钢管束部分预应力混凝土梁的施工方法，其特征在于该施工方法包括以下步骤：8. a construction method of the prefabricated steel tube bundle part prestressed concrete beam described in any one of claim 1-6, is characterized in that this construction method comprises the following steps: 步骤1、将若干榀钢构件焊接成一字型空心格构式钢管束；Step 1. Weld several steel members into in-line hollow lattice steel tube bundles; 步骤2、将挡板焊接固定在空心格构式钢管束内部的两端；最下层一榀钢构件内部的挡板的最下一层设置有若干个预应力筋孔，其他层设置有若干个预留孔；其他挡板设置有若干层、每层若干个预留孔；Step 2. Weld and fix the baffles on both ends inside the hollow lattice steel tube bundle; the lowermost layer of the baffles inside the lowermost steel member is provided with several prestressed rib holes, and the other layers are provided with several prestressed rib holes Reserved holes; other baffles are provided with several layers and several reserved holes in each layer; 步骤3、在挡板的预应力筋孔中插入预应力钢筋并贯穿整个梁，预应力钢筋在预应力筋孔中能够自由伸缩；将预应力钢筋张拉至工程设计要求的控制应力后，用临时夹具锚固；在挡板的预留孔中插入锚固钢筋后焊接于预留孔中；Step 3. Insert the prestressed steel bar into the prestressed bar hole of the baffle plate and run through the whole beam. The prestressed steel bar can expand and contract freely in the prestressed bar hole; after the prestressed steel bar is stretched to the control stress required by the engineering design, use Temporary fixture anchoring; insert anchoring steel bars in the reserved holes of the baffle plate and then weld them in the reserved holes; 步骤4、在空心格构式钢管束内部的挡板之间浇筑混凝土，待混凝土强度达到设计规定强度后，解除临时夹具对预应力钢筋的锚固，释放预应力钢筋的控制应力，形成预制钢管束部分预应力混凝土梁。Step 4. Concrete is poured between the baffles inside the hollow lattice steel tube bundle. After the concrete strength reaches the design specified strength, the anchoring of the prestressed steel bar by the temporary fixture is released, and the control stress of the prestressed steel bar is released to form a prefabricated steel tube bundle. Partially prestressed concrete beams. 9.根据权利要求7或8所述的预制钢管束部分预应力混凝土梁的施工方法，其特征在于该施工方法还包括以下步骤：将步骤4)得到的预制钢管束部分预应力混凝土梁运往现场安装，连接到其他主体结构上；挡板外的空心格构式钢管束内部空间实现与其他主体结构共同浇筑混凝土。9. the construction method of the prefabricated steel tube bundle part prestressed concrete beam according to claim 7 or 8, it is characterized in that this construction method also comprises the following steps: the prefabricated steel tube bundle part prestressed concrete beam obtained in step 4) is transported to site It is installed and connected to other main structures; the inner space of the hollow lattice steel tube bundle outside the baffle realizes the co-casting of concrete with other main structures.
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