Method for improving rigidity and bending resistance of steel structure beam

Abstract

The invention discloses a method for improving rigidity and bending resistance of a steel structure beam. The structure is composed of the steel structure beam, ultra-high performance concrete and ultra-high strength steel strands. The steel materials are assembled and welded to form a steel structure beam frame (pressure-resistant material filling spaces and prestressed material strand penetrating spaces are reserved in the upper part and the lower part of the beam); the pressure-resistant material filling space is filled with ultra-high-performance concrete and is maintained to be equal in strength according to conditions; an ultrahigh-strength steel strand penetrates through the prestress strand penetrating space; anchorage devices and locking pieces are installed at the two ends of the steel strand. And a special tensioning seat and a hollow jack are adopted to perform prestress tensioning on the steel strand. According to the structure, the compressive property of the ultra-high performance concrete and the tensile property of the ultra-high strength steel strands are fully utilized, and through reasonable prestress distribution and a reasonable tension and compression combination mode, the performance of all materials can be fully exerted, the dead weight of the steel structure beam is reduced, and the rigidity and the bending resistance of the steel structure beam are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy equipment manufacturing, and in particular relates to a method for improving the rigidity and bending resistance of a steel structure beam. Background Art

[0002] Steel beams are needed in the construction of bridges, tunnels, subways, ports, factories and other fields, as well as in the manufacturing process of lifting equipment. The use of large-span steel beams in limited working spaces is in demand, especially for heavy-load, large-span, small-section steel beams. Due to insufficient stiffness and bending resistance, many structural designs are limited and cannot meet the use requirements. This requires a solution to improve the stiffness and bending resistance of beams with limited section height. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a method for improving the rigidity and bending resistance of a steel structure beam. Through the rational combination of steel structure beams, ultra-high performance concrete (UHPC), and ultra-high strength prestressed steel strands, prestressed concrete composite steel structure beams are formed, which greatly improves the stiffness and bending resistance of the steel structure beams.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: Basic principle: Steel materials are welded together to form a steel structure beam frame (space for filling with pressure-resistant materials and space for prestressed strands are reserved at the top and bottom of the beam); the space for filling with pressure-resistant materials is filled with ultra-high performance concrete and maintained at the same strength according to conditions; ultra-high strength steel strands are passed through the prestressed strand space; anchors and locks are installed at both ends of the steel strands; special tensioning seats and hollow jacks are used to prestress the steel strands. This structure makes full use of the compressive properties of UHPC materials and the tensile properties of ultra-high strength prestressed steel strands, and through the combination of tension and compression, it greatly improves the overall stiffness and bending resistance of the steel structure beam.

[0005] A structure for improving the rigidity and bending resistance of a steel structure beam, characterized by comprising a steel structure beam (1), ultra-high performance concrete (2), ultra-high strength steel strands (4), a working anchor (3), and a locking plate (5); The steel structure beam (1) is welded from common steel materials to form a beam frame structure (1-1), and a reinforcing plate (1-2) is used inside the beam to stabilize the frame structure; The upper and lower parts of the frame of the steel structure beam (1) are both provided with spaces (1-3) for filling with pressure-resistant materials and spaces (1-4) for threading prestressed materials. The pressure-resistant material-filled space (1-3) of the steel structure beam (1) is welded to a hole position (1-5) for the component to be installed; The pressure-resistant material filling space (1-3) of the steel structure beam (1) is filled with ultra-high performance concrete (2); The ultra-high strength steel strands (4) are inserted into the prestressed material bundle insertion spaces (1-4) of the steel structure beam (1); The ultra-high strength steel strand (4) is anchored after prestressing is applied through the working anchor (3) and the locking plate (5); The ultra-high-strength steel strand (4) uses a special tensioning seat (6), a hollow jack (7), and a tool anchor (8) to achieve prestressing of the ultra-high-strength steel strand (4).

[0006] A method for improving the rigidity and bending resistance of a steel structure beam, characterized in that the method comprises the following steps: S1: welded steel structure main beam (1); S2: pouring ultra-high performance concrete (2) and curing; S3: ultra-high strength steel strand (4); S4: Install the working anchor (3) and the locking plate (5); S5: using a special tensioning seat (6), a hollow jack (7), and a tool anchor (8) to apply prestress to the high-strength steel strands to achieve tensioning and anchoring; S6: cutting off the protruding end of the ultra-high strength steel strand (4) of the working anchor (8); S7: Grouting protection of the space (1-4) where the prestressed material passes through the bundle; S8: End protection of the working anchor (3) position.

[0007] The beneficial effects of the present invention are: 1. The structure uses lightweight UHPC pressure-resistant materials to meet the compression requirements, and ultra-high-strength prestressed steel strands to meet the tension requirements, giving full play to the performance of each material and reducing the deadweight of the steel structure beam.

[0008] 2. UHPC materials and ultra-high-strength prestressed steel strands are arranged at intervals on the upper and lower parts of the steel structure beam. The compressive properties of the UHPC materials and the tensile properties of the ultra-high-strength prestressed steel strands are utilized to greatly improve the overall stiffness of the steel structure beam through a combination of tension and compression. At the same time, the steel structure beam can adopt a lower section height to meet large load requirements.

[0009] 3. For simply supported structural steel beams, the upper part is mainly made of UHPC pressure-resistant material, and the lower part is mainly made of ultra-high strength prestressed steel strands, which can greatly improve the pressure resistance of the upper part of the beam and the tensile resistance of the lower part, give full play to the performance of each material, and improve the bending resistance of the steel structure beam.

[0010] 4. For the cantilever structure beam, the lower part is mainly made of UHPC pressure-resistant material, and the upper part is mainly made of ultra-high-strength prestressed steel strands, which can greatly improve the pressure resistance of the lower part of the beam and the tensile resistance of the upper part, and improve the bending resistance of the steel structure beam cantilever.

[0011] 5. The space filled with pressure-resistant materials of steel structure beams can be welded with pipes to leave holes for the installation of components to meet the installation needs of beam components.

[0012] 6. The steel structure beams used in this method generally adopt equal cross-sections to facilitate the segmented extension of the steel structure beams.

[0013] 7. The pressure-resistant material uses UHPC material, which has the advantages of light material, high pressure resistance and low cost; the tensile material uses ultra-high strength steel strands, which have the advantages of high tensile strength, easy manufacturing and low cost; this combination method has low cost and good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Rectangular structural beam front view Figure 2 Rectangular structural beam top view AA section view Figure 3 Rectangular structural beam cross-section view Figure 4 Compressive properties of UHPC materials and distribution of ultra-high strength prestressed steel strands in rectangular structural beams Figure 5 Schematic diagram of anchor, lock plate and hollow jack tensioning Figure 6 Rectangular beam axial side Figure 1 Figure 7 Installation hole position BB cross-section diagram Figure 8 Rectangular beam axial side Figure 2 Fig. 9 Triangular structural beam cross section Fig.10 Front view of triangular structural beam Fig.11 Top view of triangular structural beam Among them: 1. Steel structure beam; 1-1. Frame structure; 1-2. Reinforcement plate; 1-3. Space filled with pressure-resistant material; 1-4. Space for prestressed material to pass through; 1-5. Installation holes; 2. Ultra-high performance concrete; 3. Working anchor; 4. Ultra-high strength steel strand; 5. Locking plate; 6. Special tensioning seat; 7. Hollow jack; 8. Tool anchor. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings.

[0016] like Figure 1-11 As shown, 1. A structure for improving the rigidity and bending resistance of a steel structure beam, comprising a steel structure beam (1), ultra-high performance concrete (2), ultra-high strength steel strands (4), a working anchor (3) and a locking plate (5); characterized in that: the steel structure beam (1) is welded from steel materials to form a beam frame structure (1-1), the interior of which is reinforced by a reinforcing plate (1-2); a pressure-resistant material filling space (1-3) and a prestressed material threading space (1-4) are provided at the upper and lower parts of the frame structure (1-1); the pressure-resistant material filling space (1-3) is filled with ultra-high performance concrete (2); the prestressed material threading space (1-4) is threaded with an ultra-high strength steel strand (4); and the ultra-high strength steel strand (4) is fixed to the working anchor (3) through a locking plate (5).

[0017] Furthermore, the pressure-resistant material filling space (1-3) of the steel structure beam (1) is welded to a pipe and leaves holes (1-5) for installing components.

[0018] Furthermore, the ultra-high strength steel strand (4) uses a special tensioning seat (6) to fix a hollow jack (7) in cooperation with a tool anchor (8) to achieve prestressing of the ultra-high strength steel strand (4).

[0019] A method for improving the rigidity and bending resistance of a steel structure beam, characterized in that the method comprises the following steps: S1: welded steel structure main beam (1); Steel is welded into a frame structure 1-1 of a required steel structure beam (1); in order to maintain the stability of the steel structure beam (1), reinforcing plates (1-2) are added at intervals; the upper and lower panels of the steel structure beam (1) are welded with steel plates to form intervals of pressure-resistant material filling spaces (1-3) and prestressed material threading spaces (1-4); the pressure-resistant material filling spaces (1-3) of the steel structure beam (1) are welded with pipes to leave installation holes (1-5) for corresponding components in the beam body, which are used to install corresponding working components on the steel structure beam (1); S2: pouring ultra-high performance concrete (2) and curing; The pressure-resistant material filling space (1-3) is filled with ultra-high performance concrete (2), and is cured in a curing environment such as a factory environment standard temperature and humidity, so that the ultra-high performance concrete (2) reaches a designed compressive strength value of 800 MPa; S3: insert the ultra-high strength steel strand (4) and install the working anchor (3) and the locking plate (5); The ultra-high strength steel strand (4) is inserted into the prestressed material bundle threading space (1-4), and the ultra-high strength prestressed steel strand (4) is inserted into the corresponding working anchor (3) hole in the order of hole positions, and the steel strands shall not cross and interfere with each other. The ultra-high strength steel strand (4) is fixed to the working anchor (3) through the locking plate (5), and the ultra-high strength steel strand (4) is prestressed and anchored through the working anchor (3) and the locking plate (5), and the tensile strength of the ultra-high strength steel strand can reach about 3000 MPa; S4: using a special tensioning seat (6), a hollow jack (7), and a tool anchor (8) to apply prestress to the high-strength steel strands to achieve tensioning and anchoring; S6: Cut off the protruding end of the ultra-high strength steel strand (4) of the working anchor (8), leaving 2-3 cm of the steel strand; S7: The prestressed material bundle passing space (1-4) is sealed by grouting through the reserved grouting opening to protect the ultra-high strength steel strand (4) for applying prestress; S8: The working anchor (8) port is sealed for protection and anti-corrosion. Application: Take the high-speed railway bridge-building machine as an example to illustrate the application. The load of the high-speed railway bridge-building machine is in the thousands of tons level, and the span is more than 40m. The main beam of the bridge-building machine is limited in height due to the clearance limit of the tunnel when building the beam in limited spaces such as tunnel entrances or tunnels. In order to meet the requirements of large spans and heavy loads under the condition of limited section height, the main beam of the bridge-building machine must have stronger rigidity and bending resistance. Through the combination of ultra-high performance concrete (UHPC) and ultra-high strength prestressed steel strands through this technical solution, the lightweight pressure resistance characteristics of UHPC materials and the ultimate tensile resistance characteristics of ultra-high strength prestressed steel strands are fully utilized, which greatly improves the rigidity and bending resistance of steel-concrete composite steel structure beams, reduces the deflection of the beam body, and improves the bending resistance of the beam body.

Claims

1. A structure for improving the rigidity and bending resistance of a steel structure beam, comprising a steel structure beam (1), ultra-high performance concrete (2), ultra-high strength steel strands (4), a working anchor (3) and a locking plate (5); characterized in that: The steel structure beam (1) is welded from steel materials to form a frame structure (1-1) of the beam, and the interior of the frame structure (1-1) is reinforced by a reinforcing plate (1-2); the upper and lower parts of the frame structure (1-1) are provided with a pressure-resistant material filling space (1-3) and a prestressed material bundle passing space (1-4); the pressure-resistant material filling space (1-3) is filled with ultra-high performance concrete (2); the prestressed material bundle passing space (1-4) is penetrated with an ultra-high strength steel strand (4); the ultra-high strength steel strand (4) is fixed to a working anchor (3) through a locking plate (5).

2. The structure for improving the rigidity and bending resistance of a steel structure beam according to claim 1, characterized in that: The pressure-resistant material filling space (1-3) of the steel structure beam (1) is welded to a pipe and leaves holes (1-5) for installing components.

3. The structure for improving the rigidity and bending resistance of a steel structure beam according to claim 1, characterized in that: The ultra-high-strength steel strand (4) uses a special tensioning seat (6) to fix a hollow jack (7) in cooperation with a tool anchor (8) to achieve prestressing of the ultra-high-strength steel strand (4).

4. The structure for improving the rigidity and bending resistance of a steel structure beam according to claim 1, characterized in that: The method for improving stiffness and bending resistance includes the following steps: S1: welded steel structure main beam (1); Steel is welded into a frame structure 1-1 of a required steel structure beam (1); in order to maintain the stability of the steel structure beam (1), reinforcing plates (1-2) are added at intervals; the upper and lower panels of the steel structure beam (1) are welded with steel plates to form intervals of pressure-resistant material filling spaces (1-3) and prestressed material threading spaces (1-4); the pressure-resistant material filling spaces (1-3) of the steel structure beam (1) are welded with pipes to leave installation holes (1-5) for corresponding components in the beam body, which are used to install corresponding working components on the steel structure beam (1); S2: pouring ultra-high performance concrete (2) and curing; The pressure-resistant material filling space (1-3) is filled with ultra-high performance concrete (2), and is cured in a curing environment such as a factory environment standard temperature and humidity, so that the ultra-high performance concrete (2) reaches a designed compressive strength value of 800 MPa; S3: insert the ultra-high strength steel strand (4) and install the working anchor (3) and the locking plate (5); The ultra-high strength steel strand (4) is inserted into the prestressed material bundle threading space (1-4), and the ultra-high strength prestressed steel strand (4) is inserted into the corresponding working anchor (3) hole in the order of hole positions, and the steel strands shall not cross and interfere with each other. The ultra-high strength steel strand (4) is fixed to the working anchor (3) through the locking plate (5), and the ultra-high strength steel strand (4) is prestressed and anchored through the working anchor (3) and the locking plate (5), and the tensile strength of the ultra-high strength steel strand can reach about 3000 MPa; S4: using a special tensioning seat (6), a hollow jack (7), and a tool anchor (8) to apply prestress to the high-strength steel strands to achieve tensioning and anchoring; S6: Cut off the protruding end of the ultra-high strength steel strand (4) of the working anchor (8), leaving 2-3 cm of the steel strand; S7: The prestressed material bundle passing space (1-4) is sealed by grouting through the reserved grouting opening to protect the ultra-high strength steel strand (4) for applying prestress; S8: The working anchor (8) port is sealed for protection and anti-corrosion.

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