CN219080086U

CN219080086U - Wet joint structure of concrete small box girder without hanging mould

Info

Publication number: CN219080086U
Application number: CN202222911160.4U
Authority: CN
Inventors: 吴建兵; 吴万忠; 卫张震; 张玉富
Original assignee: Shanghai Smi Highway Group Co ltd; Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Smi Highway Group Co ltd; Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-05-26
Anticipated expiration: 2032-11-02

Abstract

The utility model discloses a concrete small box girder non-hanging die wet joint structure, which is characterized in that gaps are formed on flange plates of a traditional small box girder, gaps of two adjacent small box girders are enclosed to form a post pouring space, effective connection between the two adjacent prefabricated small box girders is formed by utilizing U-shaped ribs, connecting ribs and a drawknot component, and a seam-shielding plate is used for blocking a joint of the adjacent small box girders, so that hanging dies and hanging columns are avoided, and the processes of supporting dies and subsequently cutting the hanging columns are avoided. The utility model solves the problems that the prior prestressed small box girder bridge adopts the traditional hanging die construction technology to pour wet joints, and a corrosion channel is easy to form after the hanging hooks of the hanging die are cut, so that the durability of the structure is reduced.

Description

Wet joint structure of concrete small box girder without hanging mould

Technical Field

The utility model relates to the technical field of bridge construction, in particular to a concrete small box girder non-hanging mould wet joint structure.

Background

Prefabricated prestressed concrete small box girders are commonly used in projects such as urban overhead engineering, highway engineering and the like. The prestressed concrete small box girder is prefabricated in a factory and is hoisted and constructed on site. The prefabricated small box Liang Tong is integrated with the post-pouring wet joint, so that the structural stress and the driving requirement are met.

Wet joints are typically constructed by hanging forms provided on the flanges of the box girder. The hanging die is generally a wood die and is hung on the lower side of the flange of the small box girder through a steel bar hanging hook, and the hanging die needs to be installed on a construction site. Binding wet joint steel bars after the hanging die is installed, pouring concrete, and removing the bottom die after the strength reaches the requirement.

The traditional hanging die construction process has the defects of larger field workload and low construction efficiency. After the wet joint construction is completed, a corrosion channel is easily formed after the hanging hook of the hanging die is cut, and the durability of the structure is reduced. The formwork hanging construction inevitably installs and removes the formwork at high altitude, construction risks of high altitude falling objects exist, and small interference exists on traffic of intersecting roads during construction.

The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

In order to overcome the defects existing in the prior art, the utility model provides a concrete small box girder non-hanging-die wet joint structure, so as to solve the problem that the existing prestressed small box girder bridge adopts the traditional hanging-die construction technology to pour the wet joint, and a corrosion channel is easy to form after a hanging hook of a hanging die is cut, so that the durability of the structure is reduced.

To achieve the above object, there is provided a concrete trabecula beam non-hanging mold wet joint structure, comprising:

the prefabricated small box girders are arranged in the same direction, gaps are formed in the outer edges of flange plates on two opposite sides of the prefabricated small box girders, and the gaps on two adjacent prefabricated small box girders are enclosed to form a rear pouring space;

the U-shaped ribs are provided with an opening end and a closing end which are opposite, the opening end is buried in the flange plate, the closing end penetrates through the notch and extends into the notch of the adjacent prefabricated small box girder, the plurality of U-shaped ribs of the two adjacent prefabricated small box girders are staggered in the rear pouring space to form a row of closed rings, and the row of closed rings are connected with connecting ribs;

the seam shielding plates are used for blocking the splicing seams between the flange plates of the two adjacent prefabricated small box girders, and two sides of the seam shielding plates are lapped on the inner walls of the gaps on the two adjacent prefabricated small box girders;

and concrete is filled in the rear pouring space and is coated in the seam shielding plate, the U-shaped ribs and the connecting ribs, a drawknot assembly is buried in the concrete, and two opposite sides of the drawknot assembly are respectively anchored in pavement layers on two adjacent prefabricated small box girders.

Further, the open ends of the U-shaped ribs are connected to the upper main ribs of the prefabricated small box girders.

Further, the connecting ribs are arranged along the length direction of the splicing seams.

Further, the number of the connecting ribs is multiple, and the connecting ribs are arranged at intervals along the circumferential direction of the row of closed rings.

Furthermore, the inner wall of the notch is stepped.

Further, a plurality of U-shaped ribs are arranged along the length direction of the prefabricated small box girder.

Further, the pavement layer is a concrete pavement layer.

The concrete small box girder non-hanging mould wet joint structure has the advantages of being optimized in structure, reliable in force transmission, free of hanging moulds and hanging rods, high in bridge construction efficiency, small in site operation amount, low in risk of falling objects at no high altitude, and small in current traffic interference. On the other hand, the subsequent die disassembly and the boom removal are not needed, the corrosion risk is avoided, and the service life of the bridge structure is prolonged.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:

fig. 1 is a schematic structural view of a concrete trabecula beam non-hanging mould wet joint construction according to an embodiment of the present utility model.

Fig. 2 is a front view of a concrete trabecular girder non-hanging mold wet joint construction according to an embodiment of the present utility model.

Fig. 3 is an enlarged partial schematic view at a in fig. 2.

Fig. 4 is a schematic structural view of a prefabricated small box girder according to an embodiment of the present utility model.

Fig. 5 is a schematic view of the arrangement of the reinforcing steel bars in the post-casting space according to the embodiment of the present utility model.

Detailed Description

The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 to 5, the present utility model provides a concrete trabecula beam non-hanging mould wet joint structure, comprising: a plurality of prefabricated small box girders, a plurality of U-shaped ribs 2, a seam shielding plate 3 and concrete 4.

With continued reference to fig. 1, in this embodiment, a plurality of prefabricated small box girders are arranged side by side in the same direction, and a splice line B is formed between the flange plates of two adjacent prefabricated small box girders. And a bearing platform 7 is poured below the end part of the prefabricated small box girder. And a bridge pier column 6 is vertically arranged on the bearing platform. And a capping beam 5 is arranged on the bridge pier. The plurality of prefabricated small box girders are continuously arranged along the length direction of the cover girders.

As shown in connection with fig. 4, the prefabricated small box girder 1 is formed with flange plates 11 at opposite sides thereof. A notch 10 is formed in the outer edge of the flange plate 11. The inner wall of the notch 10 is stepped so that the thickness of the outer side of the flange plate is gradually reduced in a stepped shape. The gaps 10 on two adjacent prefabricated small box girders 1 are enclosed to form a post-pouring space.

The U-shaped rib 2 has opposite open and closed ends. The open end is buried in the flange plate 11. The closed end passes through the notch 10 and extends into the notch 10 of the adjacent prefabricated small box girder 1. The plurality of U-shaped ribs 2 of two adjacent prefabricated small box girders 1 are staggered in the rear pouring space to form a row of closed rings A. A row of closure rings a is connected with a coupling rib 21.

In this embodiment, a plurality of U-shaped ribs 2 are provided along the length direction of the prefabricated small box girder 1. Specifically, the upper main rib 12 is arranged in the prefabricated small box girder. The upper main rib is connected to the opening end of the U-shaped rib.

Wherein, the open end of U-shaped muscle 2 is connected in prefabricated little case roof beam 1's upper portion main muscle. In this embodiment, two layers of upper main ribs are arranged on the upper portion of the prefabricated small box girder. The two layers of upper main ribs are respectively connected with two limbs at the opening end of the U-shaped rib.

In actual construction, the upper main rib passes through the flange plate and the notch and extends to the outer side of the notch, and then passes through the notch and the flange plate to extend to the upper part of the prefabricated small box girder after being bent.

As a preferred embodiment, the joint ribs 21 are provided along the length direction of the splice joint. The number of the connecting ribs is multiple. The plurality of connecting ribs are arranged at intervals along the circumferential direction of the row of closed rings A.

The two sides of the seam shielding plate 3 are lapped on the inner walls of the gaps 10 on the two adjacent prefabricated small box girders 1. The seam shielding plate 3 is used for blocking the splicing seam B between the flange plates 11 of two adjacent prefabricated small box girders 1. In this embodiment, the seam shielding plate is a galvanized steel plate.

Wherein, the outer edge of the seam shielding plate is coated with a plugging strip. The plugging strips are rubber plugging strips. Wherein the side of the plugging strip is provided with a caulking seam, and the outer edge of the shielding seam plate is embedded in the caulking seam. The sealing strip is provided with a circle of closed ring shape along the circumferential direction of the seam shielding plate.

The concrete 4 is filled in the post-pouring space and is coated on the seam shielding plate 3, the U-shaped ribs 2 and the connecting ribs. The concrete 4 has a pull-out assembly 41 embedded therein. Opposite sides of the drawknot assembly 41 are anchored in the pavement layers 13 on adjacent two prefabricated small box girders 1, respectively.

As a preferred embodiment, the pavement 13 is a concrete pavement. The paving layer is formed integrally after or simultaneously with concrete pouring.

Referring to fig. 5, in the present embodiment, the tie assembly 41 includes a plurality of tie bars and a series of bars. The tie bar spans over the seam shielding plate. Two ends of the tie bar are anchored in the paving layer poured on the upper part of the prefabricated small box girder respectively. The plurality of tie bars are arranged at intervals along the length direction of the rear pouring space. The series connection steel bars are connected with a plurality of tie steel bars.

Wherein, the number of the serially connected reinforcing steel bars is a plurality of. The plurality of serially connected reinforcing bars are arranged at equal intervals along the length direction of the tie reinforcing bars.

The concrete small box girder non-hanging mould wet joint construction method comprises the following steps:

s1, prefabricating a small prefabricated box girder in a factory, and prefabricating U-shaped ribs in a pre-buried mode.

S2, conveying the prefabricated small box girders to bridge positions, integrally hoisting the prefabricated small box girders and installing the prefabricated small box girders in place, so that a plurality of U-shaped ribs of two adjacent prefabricated small box girders are staggered in a rear pouring space to form a row of closed rings.

S3, paving a seam shielding plate in the gap of the flange plate of the adjacent prefabricated small box girder, and binding the connecting ribs and the drawknot assembly.

S4, pouring concrete in the post pouring space, vibrating and curing the concrete.

In this embodiment, the concrete compensates for shrinking steel fiber concrete.

And S5, pouring a concrete pavement layer on the upper part of the prefabricated small box girder, and completing auxiliary construction of the bridge such as asphalt pavement after curing in place.

The top of the paving layer is flush with the top of the concrete consolidation body in the post pouring space, and two ends of the tie steel bars of the tie assembly are respectively anchored in the paving layers of two adjacent prefabricated small box girders.

The concrete small box girder non-hanging mould wet joint structure has the advantages of optimized structure, reliable force transmission, no need of hanging mould and hanging rod, high bridge construction efficiency, small field work load, low risk of falling objects at high altitude and less interference to current traffic. On the other hand, the subsequent die disassembly and the boom removal are not needed, the corrosion risk is avoided, and the service life of the bridge structure is prolonged.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. A concrete trabecula beam non-hanging mould wet joint structure, characterized by comprising:

2. The concrete small box girder non-hanging wet joint construction according to claim 1, wherein the open ends of the U-shaped ribs are connected to the upper main ribs of the prefabricated small box girders.

3. The concrete box girder non-hanging wet joint construction according to claim 1, wherein the joint ribs are provided along a length direction of the joint seam.

4. A concrete small box girder non-hanging wet joint structure according to claim 3, wherein the number of the coupling ribs is plural, and the plural coupling ribs are arranged at intervals along the circumferential direction of the row of closed rings.

5. The concrete box girder non-hanging mold wet joint construction according to claim 1, wherein an inner wall of the notch has a stepped shape.

6. The concrete trabecula wet joint structure of claim 1, wherein a plurality of said U-shaped ribs are disposed along a length of said prefabricated trabecula.

7. The concrete trabecula beam non-hanging mould wet joint construction of claim 1, wherein the pavement layer is a concrete pavement layer.