CN216765536U

CN216765536U - U-shaped beam external transverse prestress anchoring system and bridge structure

Info

Publication number: CN216765536U
Application number: CN202123204703.0U
Authority: CN
Inventors: 杨一才; 肖永强; 李淑强; 张超宇; 占玉林; 李沿沿; 邵俊虎; 万淑敏
Original assignee: Qingdao Municipal Engineering Design Institute Co ltd; Qingdao Metro Line 8 Co ltd; Southwest Jiaotong University; Chengdu University
Current assignee: Qingdao Municipal Engineering Design Institute Co ltd; Qingdao Metro Line 8 Co ltd; Southwest Jiaotong University; Chengdu University
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-06-17
Anticipated expiration: 2031-12-17

Abstract

The application provides an external transverse prestress anchoring system of U-shaped beam and a bridge structure. And the two anchoring units are both used for being fixedly connected with the bottom of the beam body. The steering member is used for being connected with the bottom of the beam body and is located between the two anchoring units. Two ends of the prestressed tendon are respectively connected with the two anchoring units, the prestressed tendon is abutted against the steering piece, and the steering piece bends the prestressed tendon; the bent prestressed tendon comprises a first section and a second section which are connected, wherein the included angle between the first section and the horizontal plane is 3-5 degrees, and the included angle between the second section and the horizontal plane is-3-5 degrees. The anchoring system can enhance the transverse bending resistance bearing capacity of the bridge.

Description

U-shaped beam external transverse prestress anchoring system and bridge structure

Technical Field

The utility model relates to the field of bridge construction, in particular to a U-shaped beam external transverse prestress anchoring system and a bridge structure.

Background

The U-shaped beam is a structural form of a U-shaped thin-wall opening section consisting of a bottom plate, a web plate and a flange plate, the traditional box beam top plate arrangement is omitted, and the opening beam body bears the vehicle load.

The inventor researches and discovers that the existing U-shaped beam structure has the following defects:

the transverse bending resistance bearing capacity is weak, the existing structural design is complex, and the construction difficulty is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a U-shaped beam external transverse prestress anchoring system and a bridge structure, which can enhance the transverse bending load capacity of a beam, prolong the service life and improve the safety.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the present invention provides an anchoring system for external transverse prestress of U-shaped beam, comprising:

the two anchoring units are both used for being fixedly connected with the bottom of the beam body;

the steering piece is used for being connected with the bottom of the beam body and is positioned between the two anchoring units;

the two ends of the prestressed tendon are respectively connected with the two anchoring units, the prestressed tendon is abutted against the steering piece, and the steering piece bends the prestressed tendon; the bent prestressed tendon comprises a first section and a second section which are connected, wherein the included angle between the first section and the horizontal plane is 3-5 degrees, and the included angle between the second section and the horizontal plane is-3 degrees to-5 degrees.

In an alternative embodiment, the number of the tendons is multiple.

In an optional embodiment, the steering member includes a main body and a connecting plate, which are connected with each other, a positioning groove is provided on a surface of the main body, a groove bottom wall of the positioning groove includes a first wall and a second wall, which are connected with each other, the tendon is inserted into the positioning groove, the first wall abuts against the first section, and the second wall abuts against the second section; the connecting plate is used for being connected with the beam body.

In an alternative embodiment, the connecting plates are provided with two connecting plates which are located at two opposite sides of the main body, and each connecting plate is provided with a fixing hole for a bolt to pass through.

In an alternative embodiment, the anchoring unit comprises an anchoring seat and an anchoring block which are connected, the anchoring seat is used for being connected with the bottom of the beam body, and the anchoring block is connected with the prestressed tendon.

In an alternative embodiment, the anchor seat is provided with a positioning hole for passing a bolt.

In an optional embodiment, the anchoring block comprises a supporting plate, a pair of force transfer plates, an anchoring backing plate, a flat anchoring plate and a clamping piece, wherein the supporting plate and the pair of force transfer plates are fixedly connected with the same side surface of the anchoring seat, and the pair of force transfer plates are fixedly connected with the same side surface of the supporting plate; the flat anchor plate is fixedly connected with the supporting plate through the anchor backing plate; the support plate is provided with a first through hole, the anchor backing plate is provided with a second through hole, the flat anchor plate is provided with a third through hole, and the first through hole, the second through hole and the third through hole are communicated and coaxial; the clamping piece is arranged in the third through hole, and the clamping piece and the flat anchor plate are relatively fixed in the direction close to the anchor backing plate; the clamping piece is connected with the prestressed tendon, and the clamping piece is relatively fixed with the prestressed tendon in the extending direction of the prestressed tendon.

In an alternative embodiment, the angle between the axis of the first through hole and the anchor seat is 3-5 °.

In a second aspect, the present invention provides a bridge structure comprising:

a bridge and the U-beam external transverse pre-stressed anchoring system of any one of the preceding embodiments, wherein the steering member and the two anchoring units are connected to the bottom of the beam.

In an alternative embodiment, the two anchoring units are symmetrically arranged in the transverse direction of the beam body, and the outermost sides of the two anchoring units are respectively aligned with two lateral sides of the beam body in the transverse direction.

The embodiment of the utility model has the beneficial effects that:

in summary, the present embodiment provides an external transverse pre-stressed anchoring system for a U-shaped beam, which tensions a transverse external pre-stressed steel bundle at the bottom of a beam to balance the transverse bending deformation of the U-shaped beam due to the thinner bottom plate, so as to effectively enhance the capability of the bottom plate of the U-shaped beam structure to resist the transverse bending deformation, and simultaneously inhibit the development of longitudinal cracks of the bottom plate, and an anchoring unit and a steering member are fixed on the bottom plate of the beam to structurally reinforce the bottom plate of the beam, so as to participate in the tension together with the concrete in the tension area of the bottom plate, thereby improving the bearing capacity of the beam. The structural design has less influence on the increase of the self weight of the structure.

In addition, the prestressed tendons can be BFRP tendons, and have the advantages of high strength, fatigue resistance, corrosion resistance, low cost and the like, and the module is easy to manufacture and has higher economic benefit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of an anchoring system for external transverse prestress of U-shaped beam according to an embodiment of the present invention;

FIG. 2 is a schematic bottom view of the U-beam in-vitro transverse pre-stressed anchoring system according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of an anchoring unit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a view angle of the anchoring unit and the tendon according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of another view angle of the anchoring unit and the tendon according to the embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a clip according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a steering member according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a modification of the steering member according to the embodiment of the present invention.

Icon:

001-beam body; 100-an anchoring unit; 110-an anchor seat; 120-an anchor block; 121-a support plate; 122-a force transfer plate; 123-anchor backing plate; 124-flat anchor plate; 125-a clip; 200-a steering member; 210-a body; 211-positioning grooves; 220-a connecting plate; 221-fixing hole; 300-prestressed tendons; 310-a first section; 320-second section.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

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 or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

At present, in the construction process of the U-shaped beam, in order to ensure the structural strength of the U-shaped beam and improve the safety, a common steel bar is usually arranged at the bottom of the beam body of the U-shaped beam, and because of the structure limitation of the common steel bar, the strength enhancement effect on the beam body is poor, and the transverse bending load capacity of the bridge is weaker.

Referring to fig. 1-8, in view of this, a designer designs a U-shaped beam external transverse prestressed anchoring system, which enhances the transverse bending load-resisting capacity of the beam 001 by disposing a prestressed tendon 300 at the bottom of the beam 001.

Referring to fig. 1-2, in the embodiment, the external transverse prestressed anchoring system for U-shaped beam 001 includes two anchoring units 100, a steering member 200 and prestressed tendons 300. Both anchoring units 100 are used for fixed connection with the bottom of the beam body 001. The steering member 200 is used to be connected to the bottom of the girder 001 and is located between the two anchoring units 100. The two ends of the tendon 300 are respectively connected with the two anchoring units 100, the tendon 300 is abutted against the steering member 200, and the steering member 200 bends the tendon 300; the bent prestressed tendon 300 comprises a first section 310 and a second section 320 which are connected, wherein the included angle between the first section 310 and the horizontal plane is 3-5 degrees, and the included angle between the second section 320 and the horizontal plane is-3 degrees to-5 degrees. It should be understood that the included angle of the second segment 320 is a negative angle and merely indicates a rotational direction opposite to the included angle of the first segment 310.

According to the anchoring system with the external transverse prestress of the U-shaped beam 001 provided by the embodiment, the transverse external prestress steel bundles are tensioned at the bottom of the beam 001, so that the transverse bending deformation of the U-shaped beam caused by the thinner bottom plate is balanced, the capability of the structural bottom plate of the U-shaped beam for resisting the transverse bending deformation is effectively enhanced, and the development of longitudinal cracks of the bottom plate can be inhibited, the anchoring unit 100 and the steering member 200 are fixed on the bottom plate of the beam 001, so that the bottom plate of the beam 001 is structurally reinforced, and the bottom plate and the concrete in the tensioned region of the bottom plate participate in tensioning together, so that the bearing capacity of the beam 001 is improved. The structural design has less influence on the increase of the self weight of the structure.

It should be noted that a plurality of tendons 300 may be fixed between two anchoring units 100, for example, in this embodiment, the number of tendons 300 is three. In addition, the prestressed tendon 300 can be a BFRP tendon, and has the advantages of high strength, fatigue resistance, corrosion resistance, low cost and the like, and the module is easy to manufacture and has higher economic benefit.

In this embodiment, optionally, the two anchoring units 100 are configured to be identical, and are arranged in a centrosymmetric manner with a central line of the beam 001 extending along the length direction thereof as a symmetric line. When the two anchoring units 100 are assembled, the outermost sides of the two anchoring units are flush with the outermost sides of the beam body 001 in the transverse direction.

Referring to fig. 3-6, optionally, the anchoring unit 100 includes an anchoring seat 110 and an anchoring block 120 connected to each other, the anchoring seat 110 is used for connecting to the bottom of the bridge, and the anchoring block 120 is connected to the tendon 300. For example, the anchoring seat 110 is configured as a rectangular plate, the anchoring seat 110 is provided with positioning holes for the bolts to pass through, the positioning holes are round holes, and the number of the positioning holes is set as required, which is not specifically limited in this embodiment. When the anchoring seat 110 is fixed, one plate surface of the anchoring seat 110 is attached to the bottom of the beam body 001, then the bolt penetrates through the positioning hole, and the anchoring seat 110 is fixed to the bottom of the bridge through the bolt. It should be understood that in other embodiments, the shape of the anchor socket 110 is not limited to being rectangular, and this embodiment is not intended to be illustrative. Optionally, the anchor block 120 includes a support plate 121, a pair of force transmission plates 122, an anchor backing plate 123, a flat anchor plate 124, and a clamping piece 125, where the support plate 121 is a rectangular plate, three first through holes are provided on the support plate 121, and the three first through holes are linearly arranged in the length direction of the support plate 121. One length side of the supporting plate 121 is welded on one plate surface of the anchoring seat 110, an angle between the supporting plate 121 and the plate surface of the anchoring seat 110 is an obtuse angle or an acute angle, and meanwhile, an axis of the first through hole is perpendicular to the plate surface of the supporting plate 121, so that an included angle between the first through hole and the plate surface of the anchoring seat 110 is 3-5 degrees, wherein when the anchoring seat 110 is connected with the bottom of the beam body 001, the plane where the plate surface of the anchoring seat 110 is located is a horizontal plane. Dowel steel plate 122 sets up to the rectangular plate, and two dowel steel plates 122 all weld on anchor seat 110 to two dowel steel plates 122 are located the same face of anchor seat 110 with backup pad 121 on, and two dowel steel plates 122 are simultaneously with the same face welded fastening of backup pad 121. The anchor backing plate 123 is welded and fixed on the plate surface of the support plate 121 far away from the force transmission plate 122, three second through holes are formed in the anchor backing plate 123, and the three second through holes correspond to and are communicated with the three first through holes one to one respectively. The flat anchor plate 124 and the anchor backing plate 123 are welded and fixed on the surface far away from the support plate 121, three third through holes are formed in the flat anchor plate 124, the three third through holes are in one-to-one correspondence and communicated with the three second through holes respectively, and the corresponding first through holes, second through holes and third through holes are arranged coaxially. Meanwhile, the third through hole is a conical hole, and the inner diameter of the third through hole is gradually reduced in a direction from the side far from the anchor backing plate 123 to the side close to the anchor backing plate 123 of the flat anchor plate 124, so as to facilitate the locking clip 125. The number of the clips 125 is three, each clip 125 is provided with a threaded hole, and the tendon 300 is fixed to the threaded hole by screwing. Each clip 125 is embedded in a corresponding third through hole, and the threaded hole in each clip 125 is coaxially disposed with the corresponding third through hole. The clip 125 can be pulled out from the end of the third through-hole remote from the anchor plate, while the movement of the clip 125 in the direction from the end of the third through-hole remote from the anchor plate to the other end is restricted. The prestress is adjusted by screwing the tendon 300 to change the screw-coupling position with the clip 125.

In this embodiment, it should be noted that, because the first through hole, the second through hole and the third through hole are coaxially arranged, and an included angle between an axis of any through hole and a plate surface of the anchoring seat 110 is 3 ° to 5 °, and after the anchoring seat 110 is fixed to the bottom of the beam 001, the plate surface of the anchoring seat 110 is a horizontal plane, so that after the tendon 300 is positioned on the anchoring block 120 by using the clamping piece 125, the angle between the tendon 300 and the horizontal plane is conveniently adjusted to 3 ° to 5 °.

Referring to fig. 7 or 8, in the present embodiment, optionally, the steering component 200 includes a main body 210 and a connecting plate 220 connected to each other, a positioning groove 211 is disposed on a surface of the main body 210, a groove bottom wall of the positioning groove 211 includes a first wall and a second wall connected to each other, the tendon 300 is inserted into the positioning groove 211, the first wall abuts against the first section 310, the second wall abuts against the second section 320, and the connecting plate 220 is used for connecting to the beam 001. The steering member 200 is in close contact with the tendon 300, and plays a better role in supporting and positioning the tendon 300, so that the tendon 300 can be maintained at a set angle. Further, the connection plate 220 is provided with a fixing hole 221 through which a bolt passes. The number of the fixing holes 221 may be plural and arranged in a straight line. The steering member 200 is disposed at the bottom of the beam body 001 and is located at the middle position of the two anchoring units 100. The number of the positioning groove 211 may be one, and one of the three tendons 300 is inserted into the positioning groove 211. Obviously, in other embodiments, the number of the positioning slots 211 may be three, and each tendon 300 is respectively inserted into one positioning slot 211.

The outer horizontal prestressed anchorage system of U-shaped roof beam 001 that this embodiment provided can strengthen the roof beam 001 horizontal bending resistance carrying capacity, increase of service life, the security improves.

The present embodiment also provides a bridge structure, which comprises a bridge and the transverse prestressed anchoring system outside the U-shaped beam body 001 mentioned in the above embodiment, wherein the steering member 200 and the two anchoring units 100 are connected with the bottom of the bridge, and the steering member 200 is located at the middle position between the two anchoring units 100. The bridge structure has firm and reliable structure and high use safety.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An external transverse prestress anchoring system for U-shaped beams, which is characterized by comprising:

2. The U-beam in-vitro transverse prestressed anchoring system of claim 1, wherein:

the number of the prestressed tendons is multiple.

3. The U-beam in-vitro transverse prestressed anchoring system of claim 1, wherein:

the steering piece comprises a main body and a connecting plate which are connected, a positioning groove is formed in the surface of the main body, the bottom wall of the positioning groove comprises a first wall and a second wall which are connected, the prestressed tendon penetrates through the positioning groove, the first wall abuts against the first section, and the second wall abuts against the second section; the connecting plate is used for being connected with the beam body.

4. The U-beam in-vitro transverse prestress anchoring system of claim 3, wherein:

the connecting plate is provided with two and is located the relative both sides of main part, every all be provided with the fixed orifices that supplies the bolt to pass on the connecting plate.

5. The U-beam in-vitro transverse prestressed anchoring system of claim 1, wherein:

the anchoring unit comprises an anchoring seat and an anchoring block which are connected, the anchoring seat is used for being connected with the bottom of the beam body, and the anchoring block is connected with the prestressed tendon.

6. The U-beam in-vitro transverse prestress anchoring system of claim 5, wherein:

and the anchoring seat is provided with a positioning hole for the bolt to pass through.

7. The U-beam in-vitro transverse prestress anchoring system of claim 5, wherein:

the anchoring block comprises a supporting plate, a pair of force transfer plates, an anchoring backing plate, a flat anchoring plate and a clamping piece, wherein the supporting plate and the pair of force transfer plates are fixedly connected with the same side face of the anchoring seat, and the pair of force transfer plates are fixedly connected with the same side face of the supporting plate; the flat anchor plate is fixedly connected with the supporting plate through the anchor backing plate; the support plate is provided with a first through hole, the anchor backing plate is provided with a second through hole, the flat anchor plate is provided with a third through hole, and the first through hole, the second through hole and the third through hole are communicated and coaxial; the clamping piece is arranged in the third through hole, and the clamping piece and the flat anchor plate are relatively fixed in the direction close to the anchor backing plate; the clamping piece is connected with the prestressed tendon, and the clamping piece and the prestressed tendon are relatively fixed in the extending direction of the prestressed tendon.

8. The U-beam in-vitro transverse prestressed anchoring system of claim 7, wherein:

the included angle between the axis of the first through hole and the anchoring seat is 3-5 degrees.

9. A bridge structure, characterized in that it comprises:

a bridge and the U-beam in-vitro transverse prestressed anchoring system of any one of claims 1-8, wherein the steering member and the two anchoring units are connected to the bottom of the beam.

10. A bridge structure according to claim 9, wherein:

the two anchoring units are symmetrically arranged in the transverse direction of the beam body, and the outermost sides of the two anchoring units are respectively aligned with the two transverse outer side faces of the beam body.