CN115233536A - A light-weight fabricated steel-UHPC composite beam and its loading and unloading method - Google Patents

Abstract

The invention discloses a light assembly type steel-UHPC (ultra high performance concrete) composite beam, which comprises an UHPC bridge deck and a steel main beam, wherein a steel bottom plate is arranged below the UHPC bridge deck, an upper flange plate is arranged above the steel main beam, round-corner rectangular through holes with a rectangular middle and semicircular two sides are formed in the same position of the steel bottom plate and the upper flange plate, and a T-shaped bolt penetrates through the through hole of the steel bottom plate and the through hole of the upper flange plate to enable the bridge deck and the steel main beam to be connected together to form the steel-UHPC composite beam. The invention avoids adopting cast-in-place joint concrete to connect the steel beam and the prefabricated bridge deck slab, reduces the work of cast-in-place concrete and steel rib plate binding welding, improves the construction efficiency, avoids the interface with weak stress between the prefabricated concrete and the cast-in-place concrete, and has better integral stress performance; the locally damaged bridge deck can be quickly replaced in the bridge operation, so that the service performance and the service life of the bridge are improved; all structural components can be dismantled without damage, the recovery and the cyclic utilization of each structure of the bridge are realized, the overall cost is reduced while the low carbon and the environment are protected.

Description

A light-weight fabricated steel-UHPC composite beam and its loading and unloading method

technical field

The invention relates to the technical field of bridge engineering, in particular to a light assembled steel-UHPC composite beam and a loading and unloading method thereof.

Background technique

The steel-concrete composite beam is a bridge main beam form in which the bridge deck is made of concrete and the lower main beam is made of steel structure. In the composite beam section, the concrete bridge deck mainly bears the pressure, and the steel beam mainly bears the tensile force. It can give full play to the mechanical characteristics of the two materials, and has the advantages of high bearing capacity, good seismic performance, and good economy. Rapid development, a large number of applications in bridge construction in various places.

Conventional steel-concrete composite beams have the following problems to be solved. Steel-concrete composite girder bridge decks are generally made of ordinary concrete, which has poor tensile properties, so it is necessary to increase the thickness of the bridge deck, resulting in a large deck weight, which accounts for more than 30% of the weight of the main girder. , even reaching more than 50%. The increase of self-weight increases the stress of the main beam structure, which leads to the increase of steel beams used in the structure and reduces the economical efficiency of the structure. In the construction of urban bridges where space and lifting weight are limited, the scope of its use is limited.

Ultra-High Performance Concrete (UHPC, hereinafter referred to as UHPC) has the advantages of high elastic modulus, high tensile strength, good shrinkage and creep characteristics and excellent durability. The use of UHPC to manufacture bridge decks can reduce the structural size , reduce the weight of the structure, increase the spanning capacity of the bridge structure, and has a wide range of application prospects. The creep coefficient and later shrinkage of UHPC can be significantly reduced through high temperature curing; the structural quality can be further ensured through factory prefabrication, the on-site construction workload can be reduced, and the construction speed can be accelerated; and the UHPC section size is small, which is convenient for transportation and hoisting, so the steel-UHPC combination The beam is suitable for urban bridge construction and can solve the problems of conventional steel-concrete composite beams.

However, at present, conventional steel-UHPC composite beams are generally constructed by factory prefabrication and on-site erection. The construction period was shortened by erecting steel girders first, installing prefabricated UHPC decks, and finally connecting the steel girders and UHPC decks through cast-in-place concrete joints. In order to ensure the mechanical performance of the connection between the steel beam and the UHPC, a complex joint structure is generally used. The joints need to be arranged with connectors, and a large number of steel bars must be plate tied and welded, which increases the on-site construction workload. Maintenance increases the construction period. For urban bridges that require rapid construction, the extension of the construction period means the extension of the traffic control time, which brings adverse social and economic impacts. Due to the different pouring time between prefabricated and cast-in-place UHPC, UHPC has discontinuous interface, which is a weak link in stress. It is easy to crack during use. Structural cracking can easily lead to corrosion of steel bars in the concrete. Steel beams cause corrosion of the steel structure, reducing the safety and durability of the structure.

And in the operation process, the UHPC bridge deck directly bears various bridge deck loads, and directly bears the effects of heavy vehicle loads, rain, high temperature, freezing and thawing and other harsh working conditions. Since the UHPC bridge deck is a permanent structural layer, the shear connectors on the steel girder are embedded in the UHPC bridge deck, and it is difficult to disassemble the bridge deck and the steel girder without damage. After the bridge deck is damaged, it is difficult to replace it in the later stage, which increases the difficulty of operation and maintenance in the later stage. After the main beam reaches its service life, the bridge deck needs to be broken to separate it from the steel girder. , the damaged bridge deck becomes construction waste, and the steel beam must be damaged during the demolition process and cannot be directly reused, resulting in a waste of resources.

SUMMARY OF THE INVENTION

The present invention provides a light-weight assembled steel-UHPC composite beam and its assembling and disassembling method, so as to solve all or part of the technical problems existing in the above-mentioned background art.

In order to solve the above technical problems, in the first aspect, the present invention proposes a light-duty assembled steel-UHPC composite beam, including a UHPC bridge deck and a steel main beam, the steel main beam is installed on the bridge pier, and the UHPC bridge deck is below the deck. There is a steel base plate, an upper flange plate is arranged above the steel main beam, a plurality of steel base plate through holes are arranged on the steel base plate, and a plurality of through holes with the steel base plate are opened on the upper flange plate Corresponding upper flange plate through holes, the cross-sections of the steel bottom plate through holes and the upper flange plate through holes are rectangular in the middle and semicircular rounded rectangular through holes on both sides, and the T-shaped bolts pass through the through holes. The steel base plate through holes and the upper flange plate through holes connect the steel base plate and the upper flange plate together.

Further, the UHPC bridge deck includes a panel, longitudinal ribs and transverse ribs, the longitudinal ribs and transverse ribs are arranged below the panel, and the panel, longitudinal ribs and transverse ribs constitute a UHPC longitudinal and transverse rib, and the steel The bottom plate is arranged below the longitudinal rib.

Further, the steel main beam includes a web, a bottom plate and a steel beam diaphragm, the upper flange plate is mounted above the web, the web is mounted on the bottom plate, and the steel beam Diaphragms connect the webs.

Further, the top surface of the steel base plate is connected with a shear force connector, and the shear force connector is embedded in the panel.

Further, the width of the steel bottom plate is greater than the bottom width of the longitudinal rib. When the steel bottom plate is installed on the longitudinal rib, the center lines of the steel bottom plate and the longitudinal rib are aligned, and the steel bottom plate is aligned with the center line of the longitudinal rib. The through hole is arranged on the steel base plate at a position beyond the longitudinal rib.

Further, the shear force connector is any one of cylindrical head welding stud, angle steel, short steel bar or perforated steel plate.

Further, a plurality of the through-holes of the steel base plate and the through-holes of the upper flange plate are longitudinally arranged along the length of the steel main beam, and the minimum aperture width ratio of the through-holes of the steel base plate and the through-holes of the upper flange plate The diameter of the screw rod of the T-shaped bolt is 1.5 mm to 2.0 mm larger.

Further, the T-shaped bolt is a high-strength bolt, including a high-strength T-shaped head screw, a high-strength nut and a high-strength washer, and the end enlarged head of the high-strength T-shaped head screw and the high-strength nut are rectangular, The performance level of the T-bolt is not lower than 8.8.

The present invention has at least the following beneficial effects:

(1) A light-duty assembled steel-UHPC composite beam of the present invention connects the steel base plate and the upper flange plate together through T-shaped bolts, thereby connecting the prefabricated UHPC bridge deck and the steel main beam together, avoiding the use of The cast-in-place joint concrete connects the steel beam and the prefabricated bridge deck, which greatly reduces the on-site cast-in-place concrete and steel plate welding work, simplifies the construction, improves the construction efficiency, and avoids the stress between the precast concrete and the cast-in-place concrete. The weak interface, the overall mechanical performance of the composite beam is better;

(2) T-bolt connection is performed by opening rounded rectangular through holes on the steel bottom plate of the UHPC bridge deck and the upper flange plate of the steel main beam. With specially designed elongated holes, the present invention can allow certain manufacturing and installation errors of the steel main beam and the bridge deck, and it is more convenient to pass the screw rod through the upper and lower steel plate butt holes to complete the installation and tightening. Compared with conventional hexagonal bolts, the use of specific T-bolts can increase the contact connection area between the bolt head and the steel plate, thereby providing a higher shear connection strength and ensuring the effective connection and joint stress between the UHPC bridge deck and the steel main beam .

In a second aspect, an embodiment of the present invention also provides an installation method for a light-weight fabricated steel-UHPC composite beam, which is applied to the light-weight fabricated steel-UHPC composite beam described in the first aspect, and includes the following steps:

S1. Prefabricate the UHPC bridge deck in the prefabrication yard, embed the steel bottom plate at the bottom of the UHPC bridge deck, make the steel main beam in the steel structure processing plant, and transport the UHPC bridge deck and the steel main beam to the bridge construction site respectively;

S2. Install the steel main beam on the pier first, and then hoist the UHPC bridge deck to ensure that the steel bottom plate of the UHPC bridge deck and the upper flange plate of the steel main beam are closely attached up and down, and the steel bottom plate through holes and the upper flange on the steel main beam The upper flange plate through holes of the plate are aligned up and down, use T-shaped bolts to pass through the steel bottom plate through holes and the upper flange plate through holes in turn, and use a torque wrench to tighten the T-shaped bolts to complete the installation and erection of the main beam.

Beneficial effect: The installation method of a light-weight assembled steel-UHPC composite beam of the present invention connects the UHPC bridge deck and the steel main beam through convenient and quick T-bolts, thereby reducing the amount of concrete at the joints on the cast-in-place steel beam, The process steps such as plate tying and welding steel bars simplify the construction process, improve the construction efficiency and progress, and reduce the cost of on-site construction.

In a third aspect, an embodiment of the present invention also provides a method for disassembling a light-weight fabricated steel-UHPC composite beam, which is applied to the light-weight fabricated steel-UHPC composite beam described in the first aspect, including the following steps:

The UHPC deck and steel girders can be detached and removed quickly and without damage by removing the T-bolts connecting the steel base plate and upper flange plate.

Beneficial effect: The disassembly method of a light-weight assembled steel-UHPC composite beam of the present invention separates the UHPC bridge deck and the steel main girder through convenient and quick T-bolts. During the operation of the bridge, if the partial bridge deck is damaged, It can be directly dismantled and replaced. After the bridge reaches its service life, the bridge deck and the steel girder will remain intact after being split and can be installed and reused. It avoids breaking the bridge deck connected to the steel girder to separate and dismantle the bridge main girder, reducing the demolition of the bridge deck. The workload is reduced, and the construction waste formed by the damaged bridge deck is reduced.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic structural diagram of a light-weight fabricated steel-UHPC composite beam according to a preferred embodiment of the present invention;

2 is a schematic cross-sectional view of a light-duty fabricated steel-UHPC composite beam according to a preferred embodiment of the present invention;

3 is a schematic structural diagram of a UHPC bridge deck of a lightweight fabricated steel-UHPC composite beam according to a preferred embodiment of the present invention;

Fig. 4 is the structural schematic diagram of the steel base plate of the light-duty fabricated steel-UHPC composite beam according to the preferred embodiment of the present invention;

5 is a schematic structural diagram of a steel main beam of a light-duty fabricated steel-UHPC composite beam according to a preferred embodiment of the present invention;

6 is a schematic structural diagram of a T-bolt of a light-weight fabricated steel-UHPC composite beam according to a preferred embodiment of the present invention.

The symbols in the figure represent:

1. UHPC bridge deck; 11. Panel; 12. Longitudinal rib; 13. Transverse rib; 14. Steel base plate; 15. Shear connector; 16. Steel base plate through hole; 2. Steel main beam; 21. Upper flange plate; 22, web plate; 23, bottom plate; 24, upper flange plate through hole 25, steel beam diaphragm; 3, T-bolt; 31, high-strength T-head screw; 32, high-strength nut; 33, High-strength washers.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

Also, unless otherwise defined, technical or scientific terms used in the description of this application shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", etc. used in the description of this application to indicate orientation are only used To indicate the relative direction or positional relationship, rather than implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the described object changes, its relative positional relationship may also change accordingly. , so it cannot be construed as a limitation on this application. The terms "first", "second", "third" and similar terms used in the description of this application are only used for the purpose of description, to distinguish different components, and cannot be construed as indicating or implying relative importance. Words like "a," "an," or "the" and the like used in the description of this application should not be construed as an absolute limitation on the quantity, but should be construed as the presence of at least one. The use of "comprising" or "comprising" and similar words in the description of this application means that the elements or things appearing before the word encompass the elements or things listed after the word and their equivalents, but do not exclude other elements or things.

It should also be noted that, unless otherwise expressly specified and limited, the words "installed", "connected", "connected" and the like used in the description of this application should be understood in a broad sense, for example, the connection may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of the two components. Those skilled in the art Its specific meaning in this application can be understood according to specific circumstances.

Embodiment 1, a lightweight fabricated steel-UHPC composite beam.

As shown in FIG. 1 and FIG. 2 , the light-duty assembled steel-UHPC composite girder of this embodiment includes a UHPC bridge deck 1 and a steel main girder 2 . The bottom plate 14, the upper flange plate 21 is provided above the steel main beam 2, the steel bottom plate 14 is provided with a plurality of steel bottom plate through holes 16, and the upper flange plate 21 is provided with a plurality of upper wings corresponding to the steel bottom plate through holes 16 The flange plate through hole 24, the steel base plate through hole 16 and the upper flange plate through hole 24 have cross-sections that are rectangular in the middle and semicircular rounded rectangular through holes on both sides, and the T-bolts 3 pass through the steel base plate through holes 16 and The upper flange plate through holes 24 connect the steel base plate 14 and the upper flange plate 21 together.

As shown in FIG. 3 and FIG. 4 , in the light-weight fabricated steel-UHPC composite beam of this embodiment, the UHPC bridge deck 1 includes a panel 11 , longitudinal ribs 12 and transverse ribs 13 , and the longitudinal ribs 12 and transverse ribs 13 are provided on the panel 11 . Below, the panel 11, the longitudinal rib 12 and the transverse rib 13 form the UHPC longitudinal and transverse rib, the steel bottom plate 14 is arranged under the longitudinal rib 12, and the UHPC bridge deck 1 is made of UHPC (ultra high performance concrete). It contains steel fibers, and its compressive strength is not less than 100MPa, and its axial tensile strength is not less than 7MPa.

Among them, the thickness of the panel 11 in this embodiment is 50mm-200mm, the UHPC bridge deck 1 is a longitudinal and transverse rib system well-shaped panel, and the conventional concrete bridge deck is generally a slab of equal thickness. The weight of the bridge deck generally accounts for more than 30% of the weight of the main girder. In this embodiment, the super-strong material properties of UHPC are used, and its compressive and tensile strength far exceeds that of ordinary concrete, and the thickness of the slab can be greatly reduced. The bridge deck structure, compared with the conventional equal-thickness bridge deck, uses the longitudinal ribs 12 and the transverse ribs 13 as the stiffening of the deck 11, which can further improve the bending resistance of the UHPC bridge deck 1, and can greatly reduce the thickness of the UHPC bridge deck 1. , in order to reduce the weight of the UHPC bridge panel 1 and achieve the purpose of lightening.

The face plate 11 is provided with a steel mesh composed of longitudinal and transverse steel bars, the longitudinal ribs 12 and the transverse ribs 13 are rectangular or inverted trapezoid, and are specifically rectangular in this embodiment, and the height of the longitudinal ribs 12 and the transverse ribs 13 13. Horizontal penetration steel bars are arranged on the bottom surface to improve the transverse bending resistance level of UHPC bridge deck 1; the bottom surface of longitudinal rib 12 uses bottom steel plates to replace ordinary steel bars without longitudinal penetration steel bars, which can greatly improve the flexural tensile strength of UHPC bridge deck 1, without the need for additional Longitudinal penetrating steel bars are arranged; the longitudinal arrangement spacing of transverse ribs 13 can be set at 500mm-1500mm according to the different transverse spans of the bridge, which is specifically formulated according to the force requirements.

The bottom surface of the longitudinal rib 12 of the prefabricated UHPC bridge deck 1 is closely attached to the steel bottom plate 14, and the steel bottom plate 14 is welded with a shear force connector 15, and the shear force connector 15 is any one of cylindrical head welding studs, angle steel, short steel bars or perforated steel plates The shear force connector 15 in this embodiment is specifically a cylindrical head welding stud, which is embedded in the concrete of the longitudinal rib 12 and connects the UHPC bridge deck 1 and the steel base plate 14 through the cylindrical head welding stud.

As shown in FIG. 5 , in the light-duty fabricated steel-UHPC composite beam of this embodiment, the steel main beam 2 includes a web 22 , a bottom plate 23 and a steel beam diaphragm 25 , and the upper flange plate 21 is installed on the web 22 Above, the web 22 is installed on the bottom plate 23, the steel beam diaphragm 25 is connected to the web 22, and the web 22, the bottom plate 23 and the steel beam diaphragm 25 form an I-beam, an H-beam or a channel beam. The web 22 and the bottom plate 23 of the embodiment specifically constitute a channel beam, and the transverse arrangement position of the longitudinal ribs 12 corresponds to the position of the web 22 of the steel main beam 2 , so that the web 22 bears the gravity of the UHPC bridge deck 1 .

In the light-duty fabricated steel-UHPC composite beam of this embodiment, the width of the steel bottom plate 14 is greater than the bottom width of the longitudinal rib 12 . Aligned so that the width of the bottom edge of the steel bottom plate 14 beyond the longitudinal rib 12 is not less than 100mm, the thickness of the longitudinal rib steel bottom plate 14 is not less than 12mm, and the through hole 16 of the steel bottom plate is provided at the position of the steel bottom plate 14 beyond the longitudinal rib 12 .

In the light-duty fabricated steel-UHPC composite beam of this embodiment, a plurality of through holes 16 of the steel base plate and through holes 24 of the upper flange plate are longitudinally arranged along the length of the main beam, and the through holes 16 of the steel base plate and the through holes 24 of the upper flange plate are arranged longitudinally along the length of the main beam. The width of the aperture is 1.5mm-2.0mm larger than the diameter of the screw of the high-strength T-bolt 3.

The total length of the through hole 16 of the steel base plate and the through hole 24 of the upper flange plate is greater than the width of the hole, and a specially designed elongated hole is used to replace the circular hole, which is provided for the manufacture and installation of the UHPC bridge deck 1 and the steel main beam 2. With a certain error tolerance, the length of the through hole can be determined according to the error requirements of the main beam manufacturing and installation accuracy. UHPC bridge deck 1 and steel main girder 2 are prefabricated separately. It is difficult to precisely align all the holes longitudinally along the length of the main girder. In the process of hoisting and installation, UHPC bridge deck 1 and steel main girder 2 also have certain installations. The use of elongated holes can ensure that the T-shaped bolts 3 can easily pass through the upper and lower holes to complete the installation and tightening under the premise that there is a certain error in the actual manufacturing and installation.

As shown in FIG. 6 , in the light-duty fabricated steel-UHPC composite beam of this embodiment, the T-shaped bolt 3 is a high-strength bolt, including a high-strength T-shaped head screw 31 , a high-strength nut 32 and a high-strength washer 33 . In the embodiment, the high-strength T-shaped head screw 31 may also be a conventional high-strength large hexagon head bolt or other type of bolt with a flared head. The end enlarged head of the high-strength T-shaped head screw 31 and the high-strength nut 32 are rectangular, and the diameter of the T-shaped bolt 3 is not less than 16mm, and the performance level of the T-shaped bolt 3 is not lower than 8.8. 31 passes through the through hole 16 of the steel base plate and the through hole of the upper flange plate, and then passes through the high-strength washer 33 and the high-strength nut 32 on the other side in turn, and tightens the high-strength T-head screw 31 with a wrench to realize the steel The connection of the bottom plate 14 and the upper flange plate 21 .

In actual installation, ensure that the length direction of the high-strength T-head screw 31 is perpendicular to the length direction of the steel bottom plate through hole 16 and the upper flange plate through-hole 24, and the shear strength of the high-strength bolt is mainly determined by the high-strength T-head screw 31. Provided by friction with the steel base plate 14 and the upper flange plate 21, the use of T-bolt heads enables the most effective and maximum enlargement of the bolt head compared to conventional large hex head bolts and other forms of flaring head bolts The contact connection area with the steel base plate 1 provides higher shear strength and ensures the effective connection and common stress of the UHPC bridge deck 1 and the steel main beam 2.

The light-duty assembled steel-UHPC composite beam of this embodiment connects the prefabricated UHPC bridge deck 1 and the steel main beam 2 through high-strength T-shaped bolts 3, avoiding the use of cast-in-place joint concrete to connect the steel beam and the prefabricated bridge deck, which greatly reduces the The on-site concrete cast-in-place and steel bar welding work simplifies the construction, improves the construction efficiency, avoids the weak interface between the precast concrete and the cast-in-place concrete, and the overall mechanical performance is better; made of UHPC UHPC bridge deck 1 replaces the prefabricated + cast-in-place ordinary concrete bridge deck. Due to the super-strong material properties of UHPC, the compressive strength, tensile strength and durability of concrete are far superior to ordinary concrete. The bridge deck is lighter and thinner, and the self-weight is greatly reduced, which is convenient For transportation and hoisting, the UHPC bridge deck 1 has good durability, low risk of cracking in the later stage, and easy operation and maintenance. By opening long strip through holes on the steel bottom plate 14 and the upper flange plate 21, the bolt connection is carried out, compared with The circular holes opened by the conventional bolted steel plates can allow certain manufacturing and installation errors of the steel main beam 2, and it is more convenient to pass the screws through the upper and lower steel plate butt holes. The hexagonal bolt head can increase the contact connection area between the bolt head and the steel base plate 14, thereby providing a higher strength shear connection strength, ensuring the effective connection and common force between the UHPC bridge deck 1 and the steel main beam 2; The steel-UHPC composite beam can quickly replace the partially damaged bridge deck during operation, which improves the service performance and life of the bridge; all structural components can be removed without damage, realizing the recovery and recycling of each structure of the main beam, low carbon and environmental protection.

Embodiment 2, an installation method of a light-weight fabricated steel-UHPC composite beam.

The installation method of the light-weight fabricated steel-UHPC composite beam of the present embodiment is applied to the light-weight fabricated steel-UHPC composite beam of Embodiment 1, and includes the following steps:

S1. Prefabricate the UHPC bridge deck 1 in the prefabrication yard, and pre-embed the steel bottom plate 14 at the bottom of the UHPC bridge deck 1, manufacture the steel main beam 2 in the steel structure processing plant, and transport the UHPC bridge deck 1 and the steel main beam 2 to the bridge position respectively. Construction Site;

S2. Install the steel main beam 2 on the bridge pier first, and then hoist the UHPC bridge deck 1 to ensure that the steel bottom plate 14 of the UHPC bridge deck 1 and the upper flange plate 21 of the steel main beam 2 are closely attached up and down, and the steel on the steel main beam 2 The bottom plate through holes 16 and the upper flange plate through holes 24 of the upper flange plate 21 are aligned up and down, and the T-shaped bolts 3 are used to pass through the steel bottom plate through holes 16 and the upper flange plate through holes 24 in turn, and the T-shaped bolts are tightened with a torque wrench. Bolt 3 to complete the installation of the main beam.

In this embodiment, the UHPC bridge deck 1 and the steel main beam 2 are connected by the convenient and quick T-shaped bolts 3, which reduces the process steps such as concrete at the joints on the cast-in-place steel beams, plate welding steel bars, etc., which simplifies the construction process and improves the Construction efficiency and schedule, and reduce the cost of on-site construction.

Embodiment 3, a disassembly method of a light-weight fabricated steel-UHPC composite beam.

The disassembly method of the light-weight fabricated steel-UHPC composite beam of the present embodiment is applied to the light-weight fabricated steel-UHPC composite beam of Embodiment 1, and includes the following steps:

By removing the T-bolts 3 connecting the steel base plate 14 and the upper flange plate 21, the UHPC bridge deck 1 and the steel main beam 2 can be separated and removed without damage and quickly.

In this embodiment, the UHPC bridge deck 1 and the steel main girder 2 are separated by convenient and quick T-shaped bolts 3. During the operation of the bridge, if part of the bridge deck is damaged, it can be directly removed and replaced. After the bridge reaches its service life, the bridge deck After being split with the steel beam, it remains intact and can be installed and used repeatedly, avoiding the need to break the bridge deck connected to the steel beam to separate and dismantle the bridge main beam, reducing the workload of the bridge deck demolition and reducing the construction waste formed by the damaged bridge deck.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A light assembled steel-UHPC composite girder, characterized in that it comprises a UHPC bridge deck (1) and a steel main girder (2), the steel main girder (2) is installed on a bridge pier, and the UHPC bridge deck (1) A steel bottom plate (14) is provided below, an upper flange plate (21) is provided above the steel main beam (2), and a plurality of steel bottom plate through holes (16) are provided on the steel bottom plate (14). , the upper flange plate (21) is provided with a plurality of upper flange plate through holes (24) corresponding to the steel base plate through holes (16), the steel base plate through holes (16) and the upper flange plate through holes (16) The cross section of the flange plate through hole (24) is a rectangle in the middle and a rounded rectangle with semicircles on both sides, and the T-shaped bolt (3) passes through the steel bottom plate through hole (16) and the upper flange plate through hole (16). Holes (24) connect the steel base plate (14) and the upper flange plate (21) together. 2. A light-weight fabricated steel-UHPC composite beam according to claim 1, wherein the UHPC bridge deck (1) comprises a panel (11), a longitudinal rib (12) and a transverse rib (13), The longitudinal rib (12) and the transverse rib (13) are arranged below the panel (11), and the panel (11), the longitudinal rib (12) and the transverse rib (13) form a UHPC longitudinal and transverse rib, and the A steel bottom plate (14) is arranged below the longitudinal rib (12). 3. A light-weight fabricated steel-UHPC composite beam according to claim 1, wherein the steel main beam (2) comprises a web (22), a bottom plate (23) and a steel beam diaphragm ( 25), the upper flange plate (21) is mounted above the web (22), the web (22) is mounted on the bottom plate (23), the steel beam diaphragm (25) ) is connected to the web (22). 4. A light-duty assembled steel-UHPC composite beam according to claim 2, characterized in that, the top surface of the steel base plate (14) is connected with a shear force connector (15), and the shear force connector (15) is embedded in the panel (11). 5. A light-weight fabricated steel-UHPC composite beam according to claim 2, characterized in that the width of the steel bottom plate (14) is greater than the bottom width of the longitudinal rib (12), when the steel bottom plate (14) has a width greater than that of the longitudinal rib (12). (14) When installed on the longitudinal rib (12), the centerlines of the steel bottom plate (14) and the longitudinal rib (12) are aligned, and the steel bottom plate through hole (16) is provided on the steel bottom plate (14) beyond the longitudinal ribs (12). 6. A kind of light assembled steel-UHPC composite beam according to claim 4, is characterized in that, described shear force connector (15) is any one of cylindrical head welding stud, angle steel, short steel bar or perforated steel plate. A sort of. 7. A light-weight fabricated steel-UHPC composite beam according to claim 1, characterized in that, a plurality of the steel bottom plate through holes (16) and the upper flange plate through holes (24) are located along the The length of the steel main beam (2) is longitudinally arranged, and the minimum aperture width of the steel bottom plate through hole (16) and the upper flange plate through hole (24) is 1.5mm larger than the screw diameter of the T-shaped bolt (3). ~2.0mm. 8. A light-weight assembled steel-UHPC composite beam according to claim 1, wherein the T-shaped bolt (3) is a high-strength bolt, comprising a high-strength T-shaped head screw (31), a high-strength nut (32) and a high-strength washer (33), the enlarged end of the high-strength T-shaped head screw (31) and the high-strength nut (32) are rectangular, and the performance grade of the T-shaped bolt (3) Not less than grade 8.8. 9. An installation method for a light-weight fabricated steel-UHPC composite beam, characterized in that, applied to the light-weight fabricated steel-UHPC composite beam described in any one of claims 1 to 8, comprising the following steps: S1. The UHPC bridge deck (1) is prefabricated in the prefabrication field, the steel base plate (14) is pre-buried at the bottom of the UHPC bridge deck (1), the steel main beam (2) is fabricated in the steel structure processing plant, and the UHPC bridge deck (1) ) and the steel main beam (2) are transported to the bridge construction site; S2. Install the steel main beam (2) on the bridge pier first, and then hoist the UHPC bridge deck (1) to ensure that the steel bottom plate (14) of the UHPC bridge deck (1) and the upper flange plate (21) of the steel main beam (2) ) are closely attached up and down, the through holes (16) of the steel base plate on the steel main beam (2) and the through holes (24) of the upper flange plate (21) are aligned up and down, and the T-bolts (3) are used to pierce them in sequence. Pass through the through hole (16) of the steel base plate and the through hole (24) of the upper flange plate, and use a torque wrench to fasten the T-shaped bolt (3) to complete the installation and erection of the main beam. 10. A method for disassembling a light-weight fabricated steel-UHPC composite beam, characterized in that, applied to the light-weight fabricated steel-UHPC composite beam described in any one of claims 1 to 8, comprising the following steps: Remove the T-bolts (3) connecting the steel base plate (14) and the upper flange plate (21), that is, the UHPC bridge deck (1) and the steel main beam (2) can be separated and removed without damage and quickly.

Images