A prefabricated box girder with a concrete-filled steel tubular stiffening skeleton arch embedded therein

Abstract

The present invention discloses a prefabricated box girder with a concrete-filled steel tubular stiffening skeleton arch, belonging to the technical field of box girder construction structures. The box girder as a whole is formed by successively splicing box girder segments. By opening a casting section groove in the box girder segment, a casting through groove is formed after splicing. An arch-shaped skeleton is arranged in the casting through groove. Before casting, the two ends of the box girder are closed, and then concrete can be poured through the casting hole. The concrete flows into the casting through groove and, after solidification, the arch-shaped skeleton serves as the structure connecting each box girder segment and will not be truncated at the splicing joint. For the box girder structure of this structure, when bearing the upper load and self-weight load, the arch-shaped skeleton bears the main bending moment. Compared with the traditional prestressed box girder, it is easier to ensure the construction quality and efficiency, and avoid the downward deflection deformation caused by prestress loss and concrete creep, reducing the subsequent maintenance and reinforcement pressure. Among them, the long steel pipe can be circular or rectangular, with different load-bearing capacities respectively.

Description

Technical Field

[0001] The present invention belongs to the technical field of box girder construction structures, and particularly relates to a prefabricated box girder with a concrete-filled steel tubular stiffening skeleton arch embedded therein. Background Art

[0002] In the beam bridge system, box-shaped prestressed beams are mostly used. In order to control their downward deflection and cracking of the beam body concrete, at present, prestressed tendons are often tensioned in the beam flange and web to compensate for the tensile stress at the bottom of the beam caused by the vertical load, so as to reduce the downward deflection. However, common quality problems generally exist in the construction process of prestress, such as inaccurate positioning of the corrugated pipe ducts, time-consuming and laborious tensioning, low construction efficiency. If the prestress tensioning and grouting are not standardized, problems such as over-tensioning and under-tensioning are likely to occur, and it is extremely difficult to detect, which is likely to cause serious construction quality problems. In addition, the prestress method itself also faces the problems of concrete creep under long-term load and prestress loss, inevitably bringing safety and durability problems during the service period of the structure; and during the construction process of the box girder, it is spliced by several box girder sections. Due to the discontinuity of the steel bars in the spliced steel girder, the bearing capacity at the splicing cut-off is small, or the overall bearing capacity of the box girder is uneven. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a prefabricated box girder with a concrete-filled steel tubular stiffening skeleton arch embedded therein, reduce the quantity requirement of prestressed tendons or steel strands, and improve the uniformity of the overall bearing capacity of the box girder.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The present invention includes box girder sections for sequential splicing and an arch-shaped skeleton. Pouring section grooves that penetrate through from front to back are opened inside both sides of the box girder sections. Pouring holes that penetrate through from top to bottom are opened on the upper side of the pouring section grooves. Several of the box girder sections are sequentially spliced, and several of the pouring section grooves are sequentially connected to form a pouring through groove. The arch-shaped skeleton is fixed inside the entire pouring through groove. The arch-shaped skeleton includes several long steel pipes, at least one of the long steel pipes is arch-shaped, several of the long steel pipes are arranged vertically, and the long steel pipes are supported and connected by several fixing rods.

[0006] Furthermore, the pouring hole is divided into upper and lower sections. The aperture of the upper section of the pouring hole is larger than that of the lower section. A cylinder tube is arranged inside the pouring hole. The outer side of the cylinder tube is matched with the inner side of the pouring hole. Two vertical hanging rods are respectively hinged at opposite ends of the lower side of the cylinder tube. A wedge-shaped block is arranged at the lower end of the hanging rod. The lower side of the wedge-shaped block is an inclined surface, and a groove is arranged on the upper side. A plurality of hanging parts are arranged on the top side of the long steel pipe located above the arched framework. The hanging parts are located below the cylinder tube. Each hanging part includes two hanging rings with the same length as the diameter of the cylinder tube. After the arched framework extends into the pouring through groove and moves upward, the two hanging rings are respectively hung on the wedge-shaped blocks.

[0007] Furthermore, the cylinder tube extends out towards the top surface of the box girder section. A vibrator is fixed on the outer side of the upper end of the cylinder tube. The vibrator includes a frame and a motor arranged inside the frame. The motors are distributed in an array on the outer side of the cylinder tube, and a cam is arranged at the end of the motor.

[0008] Furthermore, a plurality of positioning support rods are arranged on one side of the long steel pipe located below the arched framework. The positioning support rod includes a bottom rod and an extension rod threadedly connected to the bottom rod. After the arched framework is hung on the cylinder tube, the positioning support rod supports on one side of the pouring through groove, so that the arched framework is suspended in the middle of the pouring through groove.

[0009] Furthermore, the inside of the long steel pipe is hollow and is used for pouring concrete.

[0010] Furthermore, raised portions and grooves arranged vertically are respectively arranged on the front and rear end faces of the box girder section. When the box girder sections are spliced in sequence, the raised portions and the grooves are matched and connected with each other.

[0011] Furthermore, a plurality of shear studs are welded on the outer side of the long steel pipe.

[0012] Furthermore, the structure of the fixing rod is an angle steel

[0013] The beneficial effects of the present invention are as follows:

[0014] The box girder as a whole is formed by successively splicing box girder segments. By opening a casting section groove in the box girder segment, a casting through groove is formed after splicing. An arch-shaped skeleton is arranged in the casting through groove. Before casting, the two ends of the box girder are sealed, and then concrete can be poured through the casting holes. The concrete flows into the casting through groove and, after solidification, the arch-shaped skeleton serves as the structure connecting each box girder segment, without any truncated parts. The solidified box girder forms an integral whole and will not be truncated at the splicing joints. Further, for the box girder structure of this invention, when bearing the upper load and self-weight load, the arch-shaped skeleton mainly bears axial pressure and axial tension to resist most of the bending moments. This invention utilizes the arch-shaped skeleton to bear most of the bending moments. Without changing the appearance dimensions, the overall construction method, and meeting the requirements of deflection and crack limits, the number of prestressed tendons is reduced and it is formed in one pouring. Compared with traditional prestressed box girders, it is easier to ensure the construction quality and efficiency, and avoid the downward deflection deformation caused by prestress loss, as well as the subsequent maintenance and reinforcement problems. Among them, the long steel pipes can be circular or rectangular, with different load-bearing capacities respectively.

[0015] Other advantages, objectives, and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0017] Figure 1 It is the overall schematic diagram of the box girder in the embodiment of the present invention;

[0018] Figure 2 It is the first schematic diagram of the box girder segment in the embodiment of the present invention;

[0019] Figure 3 It is the second schematic diagram of the box girder segment in the embodiment of the present invention;

[0020] Figure 4 It is the front schematic diagram of the box girder in the embodiment of the present invention;

[0021] Figure 5 For Figure 4 the enlarged schematic diagram at position A;

[0022] Figure 6 For Figure 4 the enlarged schematic diagram at position B;

[0023] Figure 7 It is the structural schematic diagram of the arch-shaped skeleton in the embodiment of the present invention;

[0024] Figure 8Schematic cross-sectional view of the long steel pipe in the embodiment of the present invention;

[0025] Figure 9 Schematic view of the fixation of the fixing rod in the embodiment of the present invention;

[0026] The reference signs in the drawings are as follows: 1, box girder segment; 11, protrusion; 12, groove; 2, arched skeleton; 21, long steel pipe; 22, fixing rod; 23, hanging ring; 24, positioning support rod; 241, bottom rod; 242, length-adjusting rod; 25, shear-resistant stud; 3, pouring through-groove; 31, pouring segment groove; 32, pouring hole; 4, tube; 41, vertical hanging rod; 42, wedge block; 5, vibrator; 51, frame; 52, motor; 53, cam. Detailed implementation manners

[0027] As Figures 1 to 9 shown, the present invention discloses a prefabricated box girder with an embedded steel tube concrete stiffening skeleton arch, including box girder segments 1 for sequential splicing and an arched skeleton 2. The box girder segment 1 has a narrow square frame structure, as Figure 2 and Figure 3 shown. Vertically arranged protrusions 11 and grooves 12 are respectively provided on the front and rear end faces of the box girder segment 1. When the box girder segments 1 are sequentially spliced, the protrusions 11 and the grooves 12 are connected in cooperation with each other, and this structure serves as a positioning structure for the splicing of the box girder segments 1. Pouring segment grooves 31 that penetrate through the front and rear are opened inside both sides of the box girder segment 1, and pouring holes 32 that penetrate through the upper and lower are opened above the pouring segment grooves 31. A plurality of the box girder segments 1 are sequentially spliced, and a plurality of the pouring segment grooves 31 are sequentially connected to form a pouring through-groove 3. The arched skeleton 2 is fixed inside the entire pouring through-groove 3. Referring to Figure 7 shown, the arched skeleton 2 includes a plurality of long steel pipes 21, at least one of the long steel pipes 21 is arched, and a plurality of the long steel pipes 21 are arranged vertically. The long steel pipes 21 are supported and connected by a plurality of fixing rods 22. As Figure 9 shown, the structure of the fixing rod 22 is a right-angle steel, and straight reinforcing bars that are relatively easy to obtain can also be selected.

[0028] In this solution, the overall box girder is formed by splicing box girder segments 1 in sequence. By opening a pouring section groove 31 in the box girder segment 1, a pouring through groove 3 is formed after splicing. An arch-shaped skeleton is arranged in the pouring through groove 3. Before pouring, the two ends of the box girder are sealed, and then concrete can be poured through the pouring hole 32. The concrete flows into the pouring through groove 3 and, after solidification, the arch-shaped skeleton serves as the structure connecting each box girder segment 1, without any truncated parts. The solidified box girder forms an integral whole and will not be truncated at the splicing joints. Further, for the box girder structure of this structure, when bearing the upper load and self-weight load, the arched skeleton 2 mainly bears axial pressure and axial tension to resist most of the bending moments. The present invention utilizes the arched skeleton 2 to bear most of the bending moments. Without changing the appearance size, the overall construction method, and meeting the requirements of deflection and crack limit values, the number of prestressed tendons is reduced, multi-segment assembly is carried out, and it is poured and formed at one time. Compared with the traditional prestressed box girder, it is easier to ensure the construction quality and efficiency, and avoid the downward deflection deformation caused by prestress loss and concrete creep, thus greatly reducing the subsequent maintenance and reinforcement problems. Among them, the long steel pipe 21 can be selected as circular and rectangular, with different bearing capacities respectively.

[0029] In a further solution, as Figure 4 and Figure 5 shown, the pouring hole 32 is divided into upper and lower sections. The aperture of the upper section of the pouring hole 32 is larger than that of the lower section. A tube 4 is arranged in the pouring hole 32. The outer side of the tube 4 is matched with the inner side of the pouring hole 32 to limit the downward movement of the tube 4. Two vertical hanging rods 41 are respectively hinged at the relative two ends of the lower side of the tube 4. A wedge block 42 is arranged at the lower end of the vertical hanging rod 41. The lower side of the wedge block 42 is an inclined surface, and a groove 12 is arranged on the upper side. A plurality of hanging parts are arranged on the top side of the long steel pipe 21 located above the arched skeleton 2. The hanging parts are respectively located below the tube 4. The hanging part includes two hanging rings 23 having the same length as the diameter of the tube 4. After the arched skeleton 2 extends into the pouring through groove 3, it moves upward, and the two hanging rings 23 are respectively hung into the wedge block 42.

[0030] In this solution, the arched skeleton 2 is pre-fixed by a plurality of tubes 4 and wedge blocks 42. The tube 4 is fixed in the pouring hole 32, and the arched skeleton 2 is hung below a plurality of tubes 4. The pre-fixed arched skeleton 2 can be temporarily suspended in the pouring through groove 3 to facilitate the subsequent concrete pouring. Moreover, the pre-fixation of the arched skeleton 2 is very convenient. After the box girder is pre-spliced, the arched skeleton 2 is extended into the pouring through groove 3 by a crane, and then the two ends of the arched skeleton 2 are hung. The arched skeleton 2 is moved upward. After the wedge block 42 hangs the hanging ring 23, the arched skeleton 2 can be released. This solution facilitates the subsequent sealing of the two ends of the box girder. The arched skeleton 2 changes from supporting at both ends to supporting at the upper end and always supports the arched skeleton 2 during the pouring process to ensure that the arched skeleton 2 is in the correct position in the pouring through groove 3.

[0031] In a further solution, as Figure 4 and Figure 5 shown, the bobbin tube 4 extends out towards the top surface of the box girder segment 1. A vibrator 5 is fixed on the outer side of the upper end of the bobbin tube 4. The vibrator 5 includes a frame 51 and a motor 52 arranged inside the frame 51. The motors 52 are distributed in an array on the outer side of the bobbin tube 4, and cams 53 are arranged at the ends of the motors 52.

[0032] In this solution, after pouring the concrete, the bobbin tube 4 is vibrated. The motor 52 drives the cam 53 to rotate, so that the bobbin tube 4 vibrates at a certain frequency. And this vibrator 5 is arranged on the four sides of the bobbin tube 4, and can vibrate while pouring. The vibration is transmitted to the suspended arched skeleton 2 through the bobbin tube 4, which enables the concrete to slide effectively. The vibrating concrete is easy to flow downward and form a whole with each other, avoiding the formation of a hollow in the pouring trough 3. After the pouring is completed, the bobbin tube 4 located on the top surface of the box girder is sawed off by a hacksaw, which can ensure the flatness of the top surface of the box girder.

[0033] In a further solution, as Figure 4 and Figure 6 shown, several positioning support rods 24 are arranged on one side of the long steel pipe 21 located below the arched skeleton 2. The positioning support rod 24 includes a bottom rod 241 and an extension rod 242 threadedly connected to the bottom rod 241. After the arched skeleton 2 is hung on the bobbin tube 4, the positioning support rod 24 supports on one side of the pouring trough 3, so that the arched skeleton 2 is suspended in the middle of the pouring trough 3.

[0034] This structure is used to adapt to the obliquely extending pouring trough 3. Through the positioning support rod 24 with adjustable length, it can prevent the arched skeleton 2 from leaning against the side of the pouring trough 3, ensure that the arched skeleton 2 is suspended in the middle of the pouring trough 3, and also avoid the arched skeleton 2 leaning against the side from blocking the downward flow of the concrete.

[0035] In a further solution, as Figure 8 shown, the inside of the long steel pipe 21 is hollow and is used for pouring concrete. The filled steel pipe concrete can adopt materials such as ordinary concrete, high-strength concrete, ultra-high-strength concrete, and high-ductility concrete; the cross-section of the long steel bar filled with concrete is significantly increased compared with that of the steel bar, so that the arched skeleton 2 has greater bearing capacity. Compared with increasing the prestressed tendon or reinforcement ratio, this skeleton can reduce the steel consumption while ensuring the structural stress requirements, and reduce the costs of materials, transportation, production, etc.

[0036] In a further solution, as Figure 8As shown, a number of shear studs 25 are welded to the outer side of the long steel pipe 21. The shear studs 25 are beneficial to the connection between the arch skeleton 2 and the box girder during concrete pouring, and ensure the co - working and coordinated deformation between the box girder and the arch skeleton 2 after solidification.

[0037] Finally, it should be noted that the above - mentioned preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above - mentioned preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An assembled box girder with a concrete-filled steel tubular stiffening skeleton arch embedded therein, characterized in that: It includes box girder segments (1) and arch skeletons (2) for sequential splicing. Pouring section grooves (31) that penetrate through from front to back are provided inside both sides of the box girder segment (1). Pouring holes (32) that penetrate through from top to bottom are provided on the upper side of the pouring section groove (31). A number of the box girder segments (1) are sequentially spliced, and a number of the pouring section grooves (31) are sequentially connected to form a pouring through groove (3). The arch skeleton (2) is fixed inside the entire pouring through groove (3). The arch skeleton (2) includes a number of long steel pipes (21), at least one of the long steel pipes (21) is arched, and a number of the long steel pipes (21) are arranged vertically. The long steel pipes (21) are supported and connected by a number of fixing rods (22). The pouring hole (32) is divided into upper and lower sections. The aperture of the upper section of the pouring hole (32) is larger than that of the lower section. A barrel tube (4) is provided inside the pouring hole (32). The outer side of the barrel tube (4) is matched with the inner side of the pouring hole (32). Two vertical hanging rods (41) are respectively hinged at the opposite ends of the lower side of the barrel tube (4). A wedge block (42) is provided at the lower end of the vertical hanging rod (41). The lower side of the wedge block (42) is an inclined surface, and a groove is provided on the upper side. A number of hanging parts are provided on the top side of the long steel pipe (21) located above the arch skeleton (2). The hanging parts are located below the barrel tube (4). The hanging part includes two hanging rings (23) having the same length as the diameter of the barrel tube (4). After the arch skeleton (2) extends into the pouring through groove (3) and moves upward, the two hanging rings (23) are respectively hung into the wedge block (42). The barrel tube (4) extends out towards the top surface of the box girder segment (1). A vibrator (5) is fixed on the outer side of the upper end of the barrel tube (4). The vibrator (5) includes a frame (51) and a motor (52) provided inside the frame (51). The motors (52) are arranged in an array on the outer side of the barrel tube (4). A cam (53) is provided at the end of the motor (52). A number of positioning support rods (24) are provided on one side of the long steel pipe (21) located below the arch skeleton (2). The positioning support rod (24) includes a bottom rod (241) and an extension rod (242) threadedly connected to the bottom rod (241). After the arch skeleton (2) is hung on the barrel tube (4), the positioning support rod (24) supports on one side of the pouring through groove (3), so that the arch skeleton (2) is suspended in the middle of the pouring through groove (3).

2. The precast box girder of the concrete-filled steel tubular stiffening skeleton arch according to claim 1, wherein: The inside of the long steel pipe (21) is hollow and is used for pouring concrete.

3. The prefabricated box girder of the concrete-filled steel tube stiffening skeleton arch according to claim 2, characterized in that: Vertical protrusions (11) and grooves (12) are respectively provided on the front and rear end faces of the box girder segment (1). When the box girder segments (1) are sequentially spliced, the protrusions (11) and the grooves (12) are mutually matched and connected.

4. The prefabricated box girder of the embedded concrete-filled steel tubular stiffening skeleton arch according to claim 2, wherein: A number of shear studs (25) are welded on the outer side of the long steel pipe (21).

5. The precast box girder of the embedded concrete-filled steel tube stiffening skeleton arch according to claim 1, wherein: The structure of the fixing rod (22) is angle steel.

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