CN112982142A - Cold-formed thin-walled steel web plate combined PC box girder - Google Patents

Cold-formed thin-walled steel web plate combined PC box girder Download PDF

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Publication number
CN112982142A
CN112982142A CN202110242268.6A CN202110242268A CN112982142A CN 112982142 A CN112982142 A CN 112982142A CN 202110242268 A CN202110242268 A CN 202110242268A CN 112982142 A CN112982142 A CN 112982142A
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cold
web
steel
formed thin
composite
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CN112982142B (en
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丁梦佳
许维炳
黄晓敏
孙航
陈彦江
杨坤
孙孟晓
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Beijing University of Technology
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Beijing University of Technology
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/30Metal

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  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention discloses a cold-formed thin-wall section steel web plate combined PC box girder which comprises an upper flange, a lower flange and two truss type cold-formed section steel combined webs. The web plate and the lower flange are both formed by combining cold-formed thin-walled steel sections, so that the dead weight of the beam body is reduced, and the breakthrough of span is realized. The web and the lower flange adopt a truss form, so that the overall stability of the structure can be improved, and the problem of poor local stability of the cold-formed thin-walled steel is solved. The web plate adopts cold-formed thin-wall section steel, so that the problem that the web plate of the common prestressed concrete beam bridge is easy to crack is solved fundamentally. The factory production of the cold-formed thin-wall section steel and the prefabricated composite slab can effectively accelerate the construction progress and improve the component quality. The invention has the advantages of high assembly speed, high standardization degree, low manufacturing cost, light dead weight, excellent bending resistance and crack resistance, can effectively solve the problems of complex construction, high manufacturing cost, heavy dead weight, easy cracking of web plates and the like of the traditional concrete box girder component, and is suitable for main girders of bridge structures or main and secondary girders of building structures and other components.

Description

Cold-formed thin-walled steel web plate combined PC box girder
Technical Field
The invention relates to a cold-formed thin-wall steel web plate combined PC box girder which has the advantages of light dead weight, high standardization degree, good crack resistance, low manufacturing cost and the like, belongs to the field of bridge engineering structures, and can also be used in the technical field of building structures.
Background
The prestressed concrete bridge is one of the common bridge types in China. However, with the wide application of the prestressed concrete bridge, a series of problems existing in the construction and operation processes of the prestressed concrete bridge are gradually revealed. The bridge structure has the problems that the beam body is heavy in self weight and not easy to transport in the construction stage, the field wet operation is more, the hidden construction quality of the prestressed pipeline is difficult to guarantee, and the like. And the main problems existing in the operation phase are as follows: the web is easy to crack, the shrinkage and creep are large, the prestress loss is obvious, the mid-span and long-term flexibility is realized, the concrete durability is poor, and the like. These problems limit and restrict further breakthrough of prestressed concrete bridges in span to some extent. In order to promote the application and development of prestressed concrete bridges, in recent years, China continuously explores the form of box girders based on common reinforced concrete box girders and steel box girders, and the application of steel-concrete composite girders in bridge structures is more and more extensive.
In recent years, the wide application of cold-formed thin-walled steel in light steel structures provides a new idea for the proposal of a novel box girder structure form. The cold-formed thin-walled steel can be used as a bearing structure such as a steel frame, a truss, a beam column and the like, and can also be used as a secondary component such as a roof panel, a floor slab and the like. The cold-formed thin-walled steel structure has the characteristics of light dead weight, high strength, good anti-seismic performance, low manufacturing cost, high automation degree and the like, and can show the advantages when being applied to a large-span structure. The combined structure formed by combining the cold-formed thin-wall section steel and the concrete can fully exert the advantages of different materials, has excellent structural performance, can meet the functional use requirements of the structure, and can also generate good economic effect. At present, the cold-formed thin-wall section steel-concrete combined structure is mostly applied to industrial plants and civil buildings (particularly light steel houses). Due to the characteristic of thin wall, the cold-formed thin-walled steel composite structure generally has the problems of complex construction of connection structure, poor stability of web plate, insufficient buckling resistance and the like, and the defects limit the further popularization and application of the cold-formed thin-walled steel composite structure. Therefore, the invention provides the cold-formed thin-wall section steel web combined PC box girder which has the advantages of good stability, excellent anti-seismic performance, simple structure, high standardization degree, low price and the like, can be used for bridge structure main girders of simply supported beam bridges, continuous rigid frame bridges, arch bridges and the like, and can also be used for members of building structure main girders, secondary girders and the like. The box girder structure can provide a foundation for further popularization and application of the cold-formed thin-walled steel composite structure, and has obvious theoretical significance and practical application value.
Disclosure of Invention
The invention provides a cold-bending thin-wall section steel web combined PC box girder which has the advantages of high assembly speed, high standardization degree, low manufacturing cost, light dead weight, excellent bending resistance, excellent crack resistance and the like, and is suitable for main girders of bridge structures or main and secondary girders of building structures and other members.
In order to achieve the purpose, the invention adopts the following technical scheme.
The utility model provides a cold-formed thin-walled steel web combination PC case roof beam which characterized in that: the composite plate comprises an upper flange (1), a lower flange (2) and two truss type cold-formed steel composite webs (3).
The upper flange (1) is composed of a precast concrete composite slab (1a) and a cast-in-place concrete section (1b), the precast concrete composite slab (1a) can be a common reinforced concrete member or a prestressed concrete member, and concrete materials of the precast concrete composite slab (1a) and the cast-in-place concrete section (1b) can be selected from common concrete, recycled concrete, high-performance concrete (UHPC) and other materials according to actual requirements. The precast concrete composite slab (1a) is provided with post-cast holes (1c) which penetrate through the slab and are different in shape, the post-cast holes (1c) are used for increasing the bonding between the precast concrete composite slab (1a) and the cast-in-place concrete section (1b), and the post-cast holes (1c) can be circular, rectangular, triangular and the like. The precast concrete laminated slab (1a) is provided with a row of mounting holes (1d) along two longitudinal edges thereof respectively for being connected with a web.
The truss type cold-formed steel composite web plate (3) is composed of an upper chord member (3a), a lower chord member (3b), a vertical web member (3c) and an inclined web member (3 d). The upper chord member (3a) and the lower chord member (3b) are made of U-shaped cold-formed thin-wall section steel, the vertical web members (3C) and the inclined web members (3d) are made of C-shaped cold-formed thin-wall section steel, and the height of the truss is selected according to the requirements of actual engineering (bridge structures or building structures). The included angle between the diagonal web members and the upper and lower chords is 30-60 degrees, the distance between the vertical web members (3c) and the diagonal web members (3d) is 50-100 mm, and the vertical web members (3c) and the diagonal web members (3d) are connected with the upper chords (3a) and the lower chords (3b) by adopting connecting pieces (5) such as self-tapping self-drilling screws.
The upper flange (1) and the truss type cold-formed steel combined web (3) are connected through L-shaped angle steel connecting pieces (4) and through bolts. The long limbs (4a) of the L-shaped angle steel connecting piece (4) and the upper chords (3a) of the truss type cold-formed steel combined web (3) are provided with mounting holes corresponding to one another in position, a row of preformed holes are formed in the short limbs (4b) of the L-shaped angle steel connecting piece, transverse steel bars (1e) in the precast concrete laminated slab (1) penetrate through the preformed holes, an upper flange (1) is formed through cast-in-place concrete sections (1b), and integrity of the upper flange and the web can be effectively enhanced through the form.
The lower flange (2) also adopts a truss type cold-formed steel combined flange plate, the lower chord (3b) of the truss type cold-formed steel combined web plate (3) is used as a chord support of the lower flange (2), and the horizontal support (2a) and the inclined support (2b) of the lower flange (2) both adopt C type cold-formed thin-walled steel. The horizontal brace (2a) and brace (2b) of the lower flange (2) may provide support for the casting of the upper flange concrete slab and act as a formwork. The horizontal support (2a) and the inclined support (2b) of the lower flange (2) are connected through a C-shaped cold-formed thin-wall section steel connecting piece (6) with a mounting hole and a self-tapping self-drilling screw and other connecting pieces (5). The horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are inserted into the C-shaped cold-formed thin-walled steel connecting piece (6) according to specified positions and specified angles, the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are assembled by adopting connecting pieces (5) such as tapping screws, and then the lower chord members (3b) of the truss-type cold-formed steel combined web plate (3) are connected with the C-shaped cold-formed thin-walled steel connecting piece (6) by adopting the connecting pieces (5) such as tapping screws.
The connecting piece (5) can be a self-tapping self-drilling screw connection, a rivet connection, a shooting nail connection, a high-strength bolt, a lock rivet connection and other connecting components. The arrangement modes such as the size, the interval, the number and the like of the connecting pieces can be selected according to the actual engineering requirements.
The cold-formed thin-walled steel is galvanized cold-formed thin-walled steel with the thickness of 1.5-6 mm, and the specification of the steel can be Q235, Q345 and the like.
Compared with the prior art, the invention has the following advantages:
(1) the invention reasonably utilizes two materials of cold-formed thin-wall section steel and concrete, and can improve the mechanical property of the structure while reducing the dead weight of the structure. The web plate and the lower flange are formed by combining cold-formed thin-wall section steel with light dead weight, low manufacturing cost, high strength and high industrialization degree, the quality is ensured, and the construction progress can be effectively accelerated. The box girder can also effectively reduce the dead weight of the girder body, reduce the dead load, further reduce the earthquake force, not only improve the safety of the structure, but also realize the breakthrough of the span, and is very suitable for the medium-span and large-span girder bodies. In addition, adopt the thin-walled shaped steel of clod wash can also effectively reduce the roof beam height, make the structure appearance more slim and handy, also can be used to the city bridge and the building that limited height or view required encorbelment.
(2) The connecting mode of the connecting piece can adopt self-tapping and self-drilling screw connection, rivet pulling connection, nail shooting connection, high-strength bolts, lock riveting connection and other connecting methods, and the mode can effectively improve the assembly progress and is easy to operate. Meanwhile, the situation that the work hardening of the local joint is eliminated due to welding and the local strength returns to the strength of the hot rolled material of the local joint can be avoided, so that the strength of the local joint is reduced, and the fatigue strength of the structure is seriously influenced.
(3) The invention adopts the box-shaped section beam as the closed section, which can effectively improve the bending resistance and the torsion resistance of the section, thereby improving the integral stability of the box-shaped beam structure. The web and the lower flange adopt a truss form, so that the overall stability of the structure can be further improved, the problem of poor local stability of the cold-formed thin-walled steel is solved, and meanwhile, the lower flange and the web can be used as a template for on-site construction of the upper flange, so that the construction period of template manufacture and construction is further reduced. The web plate adopts cold-formed thin-wall section steel, so that the problem that the web plate of the common prestressed concrete beam bridge is easy to crack is solved fundamentally. Because the web plate is mainly used for shearing, the compression resistance of the web plate is very low, so that the compression resistance of the concrete of the top bottom plate is more fully utilized.
Drawings
FIG. 1 is an isometric view of a cold-formed thin-walled steel web composite PC box beam;
FIG. 2 is an isometric view of an assembly member of a cold-formed thin-walled steel web composite PC box beam;
FIG. 3 is an isometric view of a precast concrete laminated slab of a cold-formed thin-walled steel web combined PC box girder;
FIG. 4 is an isometric view of a truss web of a cold-formed thin-walled steel web composite PC box girder;
FIG. 5 is a drawing of connecting shafts between a web and a lower flange of a cold-formed thin-walled steel web combined PC box girder;
FIG. 6 is an isometric view of an angle steel of a cold-formed thin-walled steel web composite PC box beam;
in the figure, 1-upper flange, 1 a-precast concrete composite slab, 1 b-cast-in-place concrete section, 1C-post-cast hole, 1 d-precast concrete composite slab mounting hole, 1 e-transverse steel bar, 2-lower flange, 2a horizontal support, 2 b-diagonal brace, 3-truss web, 3 a-upper chord, 3 b-lower chord, 3C-vertical web, 3 d-diagonal web, 3 e-upper chord mounting hole, 4-angle steel connector, 4a-L type angle steel connector long limb, 4b-L type angle steel connector short limb, 4C-long limb mounting hole, 5-self-tapping self-drilling screw and other connectors, and 6-C type cold-bending thin-wall steel connector.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Preferred examples are as follows:
as shown in fig. 1, the present example provides a cold-formed thin-walled steel web composite PC box girder for a main girder of a bridge structure, which comprises an upper flange (1), a truss type cold-formed steel composite lower flange (2), a truss type cold-formed steel composite web (3), an angle steel connector (4), self-tapping self-drilling screws and other connectors (5) and a C-shaped cold-formed thin-walled steel connector (6).
As shown in fig. 2-3, the upper flange (1) is composed of a precast concrete composite slab (1a) and a cast-in-place concrete section (1b), and the precast concrete composite slab (1a) is a UHPC-reinforced concrete slab with a plate thickness of 300 mm. The cast-in-place concrete section (1b) is made of UHPC material. The precast concrete composite slab (1a) is provided with a circular post-cast hole (1c) penetrating the thickness of the slab. And the post-cast hole (1c) is filled with UHPC in the construction process of the cast-in-place concrete section (1 b). Two longitudinal edges of the precast concrete laminated slab (1c) are provided with mounting holes (1d) with the distance of 200mm, and the precast concrete laminated slab is connected with a truss type cold-formed steel web (3) and an angle steel connecting piece (4) through a pair-passing bolt. The prefabricated composite slab is transported to a construction site after being prefabricated in a factory.
The truss type cold-formed steel combined lower flange (2) and the truss type cold-formed steel combined web plate (3) are both cold-formed thin-wall section steel, firstly, required U-shaped, C-shaped and L-shaped cold-formed thin-wall section steel is manufactured according to the drawing size in a prefabricating factory, and holes are formed in corresponding positions. During actual construction, the truss type cold-formed steel combined lower flange (2) and the truss type cold-formed steel combined web plate (3) are partially assembled firstly and then transported to a construction site.
As shown in fig. 4, the truss type cold-formed steel composite web (3) mainly comprises an upper chord (3a), a lower chord (3b), a vertical web member (3c) and an oblique web member (3 d). The upper chord (3a) and the lower chord (3b) are made of U-shaped cold-formed thin-walled steel, and the inner edge of the top surface of the upper chord is provided with a row of mounting holes (3e) for being connected with the angle steel connecting pieces (4) and the precast concrete composite slab (1 a). The vertical web members (3C) and the inclined web members (3d) adopt C-shaped cold-formed thin-wall section steel, and the total height of the truss is 2000 mm. The included angle between the diagonal web members and the upper and lower chords is 30-60 degrees, and the distance between the vertical web members (3c) and the diagonal web members (3d) is 50-100 mm. When the web plate is assembled, the positions of an upper chord (3a) and a lower chord (3b) are fixed firstly, the upper chord and the lower chord are placed on the ground, then a vertical web member (3c) and an inclined web member (3d) are inserted into the upper chord (3a) and the lower chord (3b) according to the specified positions and the specified angles, the web members are aligned with the mounting holes of the chords one by one, and the web members are connected with the chords by adopting connecting pieces (5) such as self-tapping screws.
As shown in fig. 5, the lower flange is also formed by combining truss-type cold-formed steel with a flange (2), the lower chord (3b) of the truss-type cold-formed steel combined web (3) is used as a chord support of the lower flange (2), and the horizontal support (2a) and the inclined support (2b) of the lower flange (2) are assembled by using connecting pieces (5) such as C-type cold-formed thin-walled steel (6) and self-tapping screws. In a prefabricating factory, the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are inserted into the C-shaped cold-formed thin-wall section steel connecting piece (6) according to specified positions and specified angles, the reserved holes are aligned, and the horizontal supports (2a) and the inclined supports (2b) of the lower flange are assembled by adopting connecting pieces (5) such as tapping screws.
During actual construction, the truss type cold-formed steel combined web (3) and the truss type cold-formed steel combined lower flange (2) are assembled on a construction site, and as shown in fig. 5, the lower chord (3b) of the web is connected with the C-shaped cold-formed thin-walled steel connecting piece (6) on the side surface of the lower flange through a self-tapping screw and other connecting pieces (5). And then placing an L-shaped angle steel connecting piece (4) on an upper chord (3a) of the truss type cold-formed steel combined web (3), wherein a long limb (4a) of the L-shaped angle steel connecting piece (4) is provided with a hole (4c) which is in one-to-one correspondence with a mounting hole (3e) on the top surface of the upper chord (3a), a row of preformed holes are formed in a short limb (4b) of the L-shaped angle steel connecting piece (4), a precast concrete laminated slab (1a) is placed on the L-shaped angle steel connecting piece (4), and a transverse steel bar (1e) of the precast concrete laminated slab (1a) penetrates through the preformed holes of the short limb (4b) of the L-shaped angle steel connecting piece (4). The position of adjustment precast concrete superimposed sheet (1a), align mounting hole (4c) with the angle steel long limb with mounting hole (1e) on precast concrete superimposed sheet (1a), mounting hole (3e) on upper chord (3a), then through to wearing the bolt with precast concrete superimposed sheet (1a), L type angle steel (4), upper chord (3a) of web are connected, the connection wholeness of upper flange and web can effectively be strengthened to this kind of connected mode. And finally, building a template and pouring concrete.
Preferred example two:
the embodiment provides a cold-formed thin-wall steel web plate combined PC box girder for a primary girder and a secondary girder of a building structure.
The upper flange (1) is composed of a precast concrete composite slab (1a) and a cast-in-place concrete section (1b), and the precast concrete composite slab (1a) is a recycled concrete-reinforced concrete slab with the thickness of 70 mm. The cast-in-place concrete section (1b) is made of recycled concrete material. The precast concrete composite slab (1a) is provided with a square post-cast hole (1c) penetrating the thickness of the slab. And the post-cast hole (1c) is filled with recycled concrete in the construction process of the cast-in-place concrete section (1 b). Two longitudinal edges of the precast concrete laminated slab (1c) are provided with mounting holes (1d) with the distance of 100mm, and the precast concrete laminated slab is connected with a truss type cold-formed steel web (3) and an angle steel connecting piece (4) through a pair-passing bolt. The prefabricated composite slab is transported to a construction site after being prefabricated in a factory.
The truss type cold-formed steel combined lower flange (2) and the truss type cold-formed steel combined web plate (3) are both cold-formed thin-wall section steel, firstly, required U-shaped, C-shaped and L-shaped cold-formed thin-wall section steel is manufactured according to the drawing size in a prefabricating factory, and holes are formed in corresponding positions. During actual construction, the truss type cold-formed steel combined lower flange (2) and the truss type cold-formed steel combined web plate (3) are partially assembled firstly and then transported to a construction site.
The truss type cold-formed steel composite web (3) mainly comprises an upper chord member (3a), a lower chord member (3b), a vertical web member (3c) and an inclined web member (3 d). The upper chord (3a) and the lower chord (3b) are made of U-shaped cold-formed thin-walled steel, and the inner edge of the top surface of the upper chord is provided with a row of mounting holes (3e) for being connected with the angle steel connecting pieces (4) and the precast concrete composite slab (1 a). The vertical web members (3C) and the inclined web members (3d) adopt C-shaped cold-formed thin-wall section steel, and the total height of the truss is 500 mm. The included angle between the diagonal web members and the upper and lower chords is 45 degrees, and the distance between the vertical web members (3c) and the diagonal web members (3d) is 50 mm. When the web plate is assembled, the positions of an upper chord (3a) and a lower chord (3b) are fixed firstly, the upper chord (3a) and the lower chord (3b) are placed on the ground in a side mode, then a vertical web member (3c) and an inclined web member (3d) are inserted into the upper chord (3a) and the lower chord (3b) according to the specified positions and the specified angles, the web members are aligned with mounting holes of the chords one by one, and the web members are connected with the chords in a lock rivet connection mode.
The lower flange is also assembled by adopting a truss type cold-formed steel combined flange (2), a lower chord (3b) of a truss type cold-formed steel combined web (3) is used as a chord support of the lower flange (2), and a horizontal support (2a) and an inclined support (2b) of the lower flange (2) are assembled by adopting C-shaped cold-formed thin-walled steel (6) and connecting pieces (5) such as lock rivet connection. In a prefabricating factory, the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are inserted into the C-shaped cold-formed thin-wall section steel connecting piece (6) according to specified positions and specified angles, the reserved holes are aligned, and the horizontal supports (2a) and the inclined supports (2b) of the lower flange are assembled by adopting connecting pieces (5) such as lock rivet connection and the like.
The specific construction method is the same as the first preferred embodiment, and details are not described here.
The foregoing is merely a preferred embodiment of the present patent, but practice of the present patent is not limited thereto. Various changes and modifications may be made to the invention without departing from the spirit and scope of the invention, and such changes and modifications are intended to be within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a cold-formed thin-walled steel web combination PC case roof beam which characterized in that: the steel plate truss type cold-bending structural steel composite web comprises an upper flange (1), a lower flange (2) and two truss type cold-bending structural steel composite webs (3), wherein the upper flange (1) consists of a precast concrete laminated slab (1a) and a cast-in-place concrete section (1b), the truss type cold-bending structural steel composite webs (3) consist of upper chords (3a), lower chords (3b), vertical web members (3c) and diagonal web members (3d), and the upper flange (1) and the truss type cold-bending structural steel composite webs (3) are connected through L-shaped angle steel connecting pieces (4) and opposite penetrating bolts; the lower flange (2) also adopts a truss type cold-formed steel combined flange plate, the lower chord (3b) of the truss type cold-formed steel combined web plate (3) is used as a chord support of the lower flange (2), and the horizontal support (2a) and the inclined support (2b) of the lower flange (2) both adopt C type cold-formed thin-walled steel.
2. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the precast concrete composite slab (1a) is a reinforced concrete member or a prestressed concrete member, and the concrete materials of the precast concrete composite slab (1a) and the cast-in-place concrete section (1b) are common concrete, recycled concrete or high-performance concrete according to actual requirements; the precast concrete superimposed sheet (1a) is provided with post-pouring holes (1c) which penetrate through the thickness of the sheet and are different in shape, the post-pouring holes (1c) are circular, rectangular or triangular, and the precast concrete superimposed sheet (1a) is respectively provided with a row of mounting holes (1d) along two longitudinal edges thereof for being connected with a web.
3. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the truss type cold-formed steel composite web is characterized in that an upper chord member (3a) and a lower chord member (3b) of the truss type cold-formed steel composite web (3) are made of U-shaped cold-formed thin-walled steel, a vertical web member (3C) and an oblique web member (3d) are made of C-shaped cold-formed thin-walled steel, the height of the truss is selected according to actual engineering requirements, the included angle between the oblique web member and the upper chord member and the included angle between the oblique web member and the lower chord member are 30-60 degrees, the distance between the vertical web member (3C) and the oblique web member (3d) is 50-100 mm, and the vertical web member (3C) and the oblique web member (3d) are connected with the upper chord member (3a) and the lower chord member (3b) through self-tapping self.
4. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are connected through C-shaped cold-formed thin-walled steel connecting pieces (6) with mounting holes and self-tapping self-drilling screws and other connecting pieces (5), the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are inserted into the C-shaped cold-formed thin-walled steel connecting pieces (6) according to specified positions and specified angles, the horizontal supports (2a) and the inclined supports (2b) of the lower flange (2) are assembled through the self-tapping screw connecting pieces (5), and then the lower chord members (3b) of the truss type cold-formed steel combined web (3) are connected with the C-shaped cold-formed thin-walled steel connecting pieces (6) through the self-tapping screws and other connecting pieces (5).
5. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the long limb (4a) of L type angle steel connecting piece (4) and last chord member (3a) of truss-like cold-formed steel combination web (3) are provided with the mounting hole of position one-to-one, are provided with one row of preformed holes in L type angle steel connecting piece's short limb (4b) department, and horizontal reinforcing bar (1e) in precast concrete superimposed sheet (1) passes this preformed hole to form top flange (1) through cast in situ concrete section (1 b).
6. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the connecting pieces (5) are self-tapping self-drilling screw connection, rivet connection, shooting connection, high-strength bolts or lock rivet connection, and the size, the interval and the number of the connecting pieces are selected according to actual engineering requirements.
7. The cold-formed thin-walled steel web composite PC box girder of claim 1, wherein: the cold-formed thin-walled steel is galvanized cold-formed thin-walled steel with the thickness of 1.5-6 mm, and the specification of the steel is Q235 or Q345.
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