CN212000568U

CN212000568U - Precast concrete box girder bridge

Info

Publication number: CN212000568U
Application number: CN201922061878.7U
Authority: CN
Inventors: 聂建国; 赵继之; 杨悦
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-11-24
Anticipated expiration: 2029-11-25

Abstract

The utility model relates to a bridge building technical field, concretely relates to precast concrete box girder bridge. A precast concrete box girder bridge, comprising: a plurality of prefabricated box girder bodies are arranged in parallel at intervals; the precast concrete plates are arranged in parallel at intervals, at least one end of each precast concrete plate is supported on the edge of the flange of the precast box girder body, and a gap is reserved between every two adjacent precast concrete plates; and a concrete post-pouring layer filled in the gap and completely covering the top surface of the precast concrete slab. The concrete post-cast layer, the precast concrete plate and the precast box girder body form a whole, the integrity of the bridge is enhanced, and the construction efficiency is improved; and the joint is positioned on the supporting surface of the precast box girder body, and the precast box girder body provides certain support for two precast concrete plates which are connected with each other, so that the connection strength between each part of the concrete composite slab box girder bridge is further strengthened.

Description

Precast concrete box girder bridge

Technical Field

The utility model relates to a bridge building technical field, concretely relates to precast concrete box girder bridge.

Background

The method comprises the steps of firstly positioning the precast concrete box girders in the construction process, then aligning the beard ribs of the adjacent precast concrete box girders and erecting a template, welding the two ends of the additional transverse steel bars to the beard ribs (lap welding seams) in situ, and then pouring post-cast concrete between the adjacent precast concrete box girders to form effective transverse connection. Because the precast concrete box girder bridges are transversely connected by using the abutted seams, and the construction of the transverse connection abutted seam structure is complicated, the field welding workload is large, the welding quality is not easy to control, and the abutted seam is easy to become a position with weak stress.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the box girder bridge transverse connection structure joint strength among the prior art and is weaker, defect that the efficiency of construction is low to a precast concrete box girder bridge is provided.

In order to solve the technical problem, the utility model provides a precast concrete box girder bridge, include:

a plurality of prefabricated box girder bodies are arranged in parallel at intervals;

the precast concrete plates are arranged in parallel at intervals, at least one end of each precast concrete plate is supported on the edge of the flange of the precast box girder body, and a gap is reserved between every two adjacent precast concrete plates;

and a concrete post-pouring layer filled in the gap and completely covering the top surface of the precast concrete slab.

Preferably, the width of the gap is greater than the width of the ends of the two precast concrete panels that are set up on the support surface of the precast box girder body.

Preferably, the opposite surfaces of two adjacent precast concrete plates are provided with slotted holes, and additional steel bars are horizontally arranged in the slotted holes.

Preferably, the top surface of the precast concrete slab is formed with a galling structure and is provided with angular shear reinforcements.

Preferably, the top surface of the precast box girder body is formed with a galling structure and is provided with an angular shear reinforcement.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a precast concrete box girder bridge, including the precast box girder body that a plurality of parallel intervals set up, set up precast concrete board on the precast box girder body, it has the clearance to reserve between the concrete board, waters the layer after the concrete and fills in the clearance and cover precast concrete board's top surface completely. The precast concrete plate is supported on the flange plate of the precast box girder body, the precast box girder body and the precast concrete plate are connected by utilizing the concrete post-pouring layer, and the precast concrete plate is completely covered by the concrete post-pouring layer, so that the concrete post-pouring layer, the precast concrete plate and the precast box girder body form a whole, the integrity of the bridge is enhanced, and the construction efficiency is improved; and the joint is positioned on the supporting surface of the precast box girder body, and the precast box girder body provides certain support for two precast concrete plates which are connected with each other, so that the connection strength between each part of the concrete composite slab box girder bridge is further strengthened.

2. The utility model provides a precast concrete box girder bridge, the width in clearance is greater than the width of setting up two precast concrete slab's on the holding surface of precast box girder body tip, precast concrete slab's support length on precast box girder has been guaranteed, simultaneously under the prerequisite that makes concrete post-cast layer can stable connection precast concrete slab, make concrete post-cast layer between two adjacent precast concrete slab have certain effective length, guarantee to water the joint strength between layer and the precast box girder body behind the concrete, make concrete post-cast layer, can both connect completely between precast concrete slab and the precast box girder body, form a whole.

3. The utility model provides a precast concrete box girder bridge has all seted up the bar slotted hole on two adjacent precast concrete slab's the opposite face, further strengthens the transverse connection intensity between the precast concrete slab, and the horizontal additional reinforcing bar that has been arranged in the mounting groove strengthens the horizontal tensile strength on concrete post-cast layer between the precast concrete slab, strengthens the wholeness between the precast concrete slab.

4. The utility model provides a precast concrete box girder bridge, precast box girder body and precast concrete slab's top surface napping is handled and is installed angular form shear reinforcement, improves the adhesion force between precast box girder body and precast concrete slab and the post-cast concrete layer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a precast concrete box girder bridge according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a precast concrete box girder bridge provided in an embodiment of the present invention.

Description of reference numerals: 1. prefabricating a box girder body; 2. prefabricating a concrete slab; 3. a slotted hole; 4. adding a steel bar; 5. post-pouring concrete layer; 6. angular shear reinforcement bars; 7. and (5) napping structure.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

Fig. 1-2 show a concrete embodiment of the precast concrete box girder bridge according to the present embodiment, which includes: the precast box girder comprises a precast box girder body 1, a precast concrete plate 2 and a concrete post-pouring layer 5.

Two prefabricated box girder bodies 1 are arranged in parallel at intervals and are of inverted trapezoidal structures with large upper parts and small lower parts. In order to enhance the bonding force between the interface of the precast box girder body 1 and the concrete post-cast layer 5, the top surface of the precast box girder body 1 is subjected to galling treatment to form a galling structure 7 and is provided with angular shear steel bars 6.

Three precast concrete boards 2 are erected on the edges of the flanges of the two precast box girder bodies 1, the three precast concrete boards 2 are arranged in parallel, a gap is reserved between the two adjacent precast concrete boards 2, and the width of the gap is larger than the width of the end parts of the two precast concrete boards 2 erected on the supporting surface of the precast box girder body 1. One ends of the two precast concrete plates 2 positioned at the two ends are respectively lapped on the two precast box girder bodies 1, and the two ends of the precast concrete plate 2 positioned in the middle are respectively lapped on the two precast box girder bodies 1. All seted up slotted hole 3 on two adjacent precast concrete board 2's the opposite face, slotted hole 3 is a plurality of that set up along precast concrete board 2's length direction interval, and the level has arranged additional reinforcing bar 4 in the slotted hole 3, and the both ends of additional reinforcing bar 4 extend to respectively in two relative slotted holes 3. In order to enhance the adhesion between the precast concrete panel 2 and the interface of the concrete post-cast layer 5, the top surface of the precast concrete panel 2 is napped to form a napped structure 7 and is provided with angular shear reinforcement bars 6.

The gaps between the precast concrete panels 2 are filled with a concrete post-cast layer 5, and the concrete post-cast layer 5 also completely covers the top surfaces of the precast concrete panels 2. And (3) firmly connecting two adjacent precast concrete plates 2 and the precast box girder body 1 below through the adhesive force of the concrete post-pouring layer 5.

The precast concrete plate 2 is supported on the flange plate of the precast box girder body 1, the precast box girder body 1 and the precast concrete plate 2 are connected by the concrete post-pouring layer 5, and the precast concrete plate 2 is completely covered by the concrete post-pouring layer 5, so that the concrete post-pouring layer 5, the precast concrete plate 2 and the precast box girder body 1 form a whole, the integrity of the bridge is enhanced, and the connection strength between all parts of the concrete laminated plate box girder bridge is enhanced.

Example 2

The embodiment provides a specific implementation mode of a construction method of a precast concrete box girder bridge, and the construction method comprises the following steps of:

finishing the processing of a precast concrete plate 2 and a precast box girder body 1 in a factory, burying an angular shear reinforcement 6 on the top surface of the precast concrete plate 2 and carrying out napping treatment, wherein a strip-shaped slotted hole 3 is formed at the plate end of the precast concrete plate 2, the hole opening position is positioned between the stressed reinforcements in the precast concrete plate 2, and the strip-shaped slotted hole 3 is formed from the top of the precast concrete plate 2 and does not completely penetrate through the bottom of the precast concrete plate 2; angular shear steel bars 6 are arranged at the top end of the prefabricated box girder body 1, and the top end is subjected to galling treatment to form a galling structure 7.

Hoisting a plurality of precast box girder bodies 1 to a preset position; erecting the end parts of the precast concrete plates 2 on the flange of the precast box girder body 1, and reserving a gap between every two adjacent precast concrete plates 2; in the slotted holes 3 of the opposite sides of the precast concrete slab 2, additional reinforcing bars 4 are horizontally arranged, the length of the additional reinforcing bars 4 being equal to the distance between the notch ends of the opposite slotted holes 3.

Binding and installing stressed steel bars in the concrete post-pouring layer 5, pouring concrete in the gap between every two adjacent precast concrete plates 2 and on the top surfaces of the precast concrete plates 2 by taking the precast concrete plates 2 and the precast box girder body 1 as templates, and enabling the concrete to completely cover the top surfaces of the precast concrete plates 2 to form the concrete post-pouring layer 5.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A precast concrete box girder bridge, comprising:

a plurality of prefabricated box girder bodies (1) are arranged in parallel at intervals;

the precast concrete plates (2) are arranged in parallel at intervals, at least one end of each precast concrete plate (2) is supported on the edge of the flange of the precast box girder body (1), and a gap is reserved between every two adjacent precast concrete plates (2);

and a concrete post-cast layer (5) filled in the gap and completely covering the top surface of the precast concrete slab (2).

2. Precast concrete box girder bridge according to claim 1, characterized in that the width of the gap is larger than the width of the ends of the two precast concrete plates (2) that are set up on the supporting surface of the precast box girder body (1).

3. The precast concrete box girder bridge according to claim 1 or 2, wherein opposite faces of two adjacent precast concrete plates (2) are provided with slotted holes (3), and additional reinforcing steel bars (4) are horizontally arranged in the slotted holes (3).

4. The precast concrete box girder bridge according to claim 3, wherein the precast concrete slab (2) is formed with a napped structure (7) on the top surface thereof and is installed with an angular shear reinforcement (6).

5. The precast concrete box girder bridge according to claim 3, wherein the top surface of the precast box girder body (1) is molded with a galling structure (7) and is installed with an angular shear reinforcement (6).