阅读说明：本技术 一种埋入式连续梁拱组合桥吊杆锚固结构 (Embedded continuous beam arch combined bridge hanging rod anchoring structure ) 是由 黄毅 陈克坚 刘伟 徐勇 易大伟 胡玉珠 游励晖 王应良 于 2021-09-24 设计创作，主要内容包括：一种埋入式连续梁拱组合桥吊杆锚固结构,有效简化吊杆张拉、锚固施工工艺,避免锚头局部承压应力集中,降低设计和施工难度,极大改善运营期间桥梁吊杆的养护维修条件。吊杆上端为固定端,通过锚头与吊杆拱肋形成固定连接,吊杆下端为张拉端,通过吊杆锚固构件与箱梁及横梁形成锚固连接。吊杆锚固构件包括一对顺桥向间隔设置的锚拉板,该对锚拉板的下部埋入箱梁及横梁的混凝土内,板面焊接设置抗剪构件,混凝土对抗剪构件紧密包裹形成抗剪连接件,与锚拉板共同组成抗拉锚固装置；该对锚拉板的上部出露在桥面上用于吊杆张拉端锚具的安装固定及张拉,锚垫板位于该对锚拉板之间且与其板面焊接,该锚垫板上同时锚固两根吊杆,形成双吊杆体系。(The utility model provides an bury formula continuous beam arch combination bridge hanger rod anchor structure, effectively simplifies jib stretch-draw, anchor construction technology, avoids the local bearing stress concentration of anchor head, reduces the design and the construction degree of difficulty, greatly improves the maintenance condition of bridge hanger rod during the operation. The upper end of the suspender is a fixed end and is fixedly connected with the arch rib of the suspender through an anchor head, the lower end of the suspender is a stretching end, and the suspender anchoring member is in anchoring connection with the box girder and the cross beam. The suspender anchoring member comprises a pair of anchor pulling plates arranged at intervals along the bridge direction, the lower parts of the anchor pulling plates are embedded into concrete of the box girder and the cross beam, a shear-resistant member is welded on the plate surface, the concrete shear-resistant member is tightly wrapped to form a shear-resistant connecting piece, and the shear-resistant connecting piece and the anchor pulling plates form a tension-resistant anchoring device together; the upper parts of the pair of anchor plates are exposed on the bridge floor and used for installing, fixing and tensioning an anchorage device at the tensioning end of the suspender, the anchor backing plate is positioned between the pair of anchor plates and welded with the plate surface of the anchor backing plate, and the two suspenders are simultaneously anchored on the anchor backing plate to form a double-suspender system.)

1. The utility model provides an bury formula continuous beam arch combination bridge hanger rod anchor structure connects through jib (1) between arch rib (2) and concrete box girder (3) and forms wholly characterized by: the upper end of the suspender (1) is a fixed end, and is fixedly connected with the arch rib (2) of the suspender (1) through an anchor head, and the anchor head is positioned in the abdominal cavity of the arch rib (2) or between the upper chord and the lower chord thereof; the lower end of the suspender (1) is a stretching end and forms anchoring connection with the box girder (3) and the cross beam (5) through an anchoring structure (4); the anchoring structure (4) comprises a pair of anchoring plates (6) arranged at intervals along the bridge direction, the lower parts of the anchoring plates (6) are embedded into concrete of the box girder (3) and the cross beam (5), a shear-resistant member is welded on the plate surface, the concrete shear-resistant member is tightly wrapped to form a shear-resistant connecting piece, and the shear-resistant connecting piece and the anchoring plates (6) form a tension-resistant anchoring device together; the upper parts of the pair of anchor plates (6) are exposed on the bridge floor and used for installing, fixing and tensioning an anchor (11) at the tensioning end of the suspender, an anchor backing plate (9) is positioned between the pair of anchor plates (6) and welded with the plate surface of the anchor backing plate, and the two suspenders (1) are simultaneously anchored on the anchor backing plate (9) to form a double-suspender system.

2. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 1, which is characterized in that: side sealing plates (12) are welded on the two sides of the upper parts of the pair of anchor pulling plates (6) to form an anchor box structure, and a top sealing plate (10) is welded on the top ends of the anchor pulling plates to seal the anchor box structure; in the anchor box structure, webs (7) welded with the plate surfaces of two anchor plates (6) are transversely arranged at intervals; and stiffening ribs (8) welded with the plate surfaces of the anchor pulling plate (6) and the anchor backing plate (9) are welded between the adjacent webs (7).

3. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 2, which is characterized in that: the upper ends of the pair of anchor pulling plates (6) are bent towards the inside of the anchor box structure to form a wedge-shaped structure with the web plate (7) and the stiffening ribs (8), so that the axial bearing capacity of the pressure-bearing anchoring of the anchor backing plate (9) is improved.

4. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 1, which is characterized in that: the shear member comprises shear nails (13) welded on the lower plate surface of the anchor plate (6) at intervals, and a base plate (14) welded at the lower end of the anchor plate (6).

5. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 1, which is characterized in that: the surfaces of the pair of anchor plates (6) are provided with beam body steel bar passing holes (16) for the transverse common steel bars (18) on the top surface of the box girder (3) to pass through.

6. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 1, which is characterized in that: and a pre-embedded pipe (15) communicated with the inner cavity of the box-shaped structure is pre-embedded in concrete of the box girder (3) and the cross beam (5), and the upper port of the pre-embedded pipe (15) corresponds to the mounting position of the anchor (11) at the tensioning end of the suspender.

7. The anchoring structure of the embedded continuous beam-arch combined bridge hanging rod of claim 1, which is characterized in that: and a concrete water retaining platform (17) is arranged at the junction of the anchor plate (6) and the top surface of the box girder (3), and a slope is arranged on the top surface of the concrete water retaining platform (17).

Technical Field

The invention relates to the technical field of bridge engineering, in particular to an embedded continuous beam arch combined bridge hanging rod anchoring structure.

Background

In recent years, the railway construction business of China is rapidly developed, and a large number of large-span complex bridges are built, wherein the large-span complex bridges are novel in structure, complex in technology and high in construction difficulty. Among them, a continuous beam (rigid frame) arch composite system bridge is a typical representative. When the conventional three-span continuous structure span cannot meet the design requirement, a larger-span bridge structure needs to be adopted to span roads or navigation rivers, and the line elevation causes the net height under the bridge to be limited, the bridge type is a reasonable choice. The continuous beam (rigid frame) arch combined system bridge has the characteristics of large spanning capacity, small construction interference, light and attractive structure and the like, and is widely applied to the field of railway bridge construction.

This bridge type sets up flexible jib between steel arch rib and concrete beam body, transmits the roof beam portion load to the arch rib through the jib, forms the roof beam and encircles combination stress structure. Therefore, the connection and anchoring of the suspender and the main beam are of great importance, the concrete anchor block is usually arranged at the junction of the flange plate bottom and the web plate of the main beam in the same bridge structure at present, and the suspender penetrates through the flange plate and the anchor block of the main beam from the top of the bridge floor and is anchored at the bottom of the concrete anchor block. The disadvantages of this configuration are: firstly, the size of a concrete anchor block is limited, the local bearing stress of the anchor block is concentrated after a suspender is tensioned, and the junction of the anchor block and a web plate is easy to crack; secondly, the anchor head at the lower end of the suspender is positioned below the flange plate of the main beam, construction, installation, inspection and maintenance can only work under the beam, and the operation is very inconvenient; and thirdly, the anchor head at the bottom of the anchor block is completely exposed, so that the durability of the suspender is influenced, and the service life of the suspender is unfavorable.

Disclosure of Invention

The invention aims to solve the technical problem of providing an embedded continuous beam-arch combined bridge hanger rod anchoring structure, effectively simplifying the hanger rod tensioning and anchoring construction process, avoiding the safety risk of high-altitude operation in vault tensioning, or the problems of no operating platform, high construction risk and the like in beam bottom tensioning and anchoring, avoiding the local bearing stress concentration of an anchor head, reducing the design and construction difficulty and greatly improving the maintenance and repair conditions of a bridge hanger rod during operation.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the invention relates to an embedded continuous beam-arch combined bridge hanging rod anchoring structure, wherein arch ribs and a concrete box girder are connected into a whole through hanging rods, and the embedded continuous beam-arch combined bridge hanging rod anchoring structure is characterized in that: the upper end of the suspender is a fixed end and is fixedly connected with the arch rib of the suspender through an anchor head, and the anchor head is positioned in the abdominal cavity of the arch rib or between the upper chord and the lower chord of the arch rib; the lower end of the suspender is a stretching end and forms anchoring connection with the box girder and the cross beam through a suspender anchoring component; the suspender anchoring member comprises a pair of anchor pulling plates arranged at intervals along the bridge direction, the lower parts of the anchor pulling plates are embedded into concrete of the box girder and the cross beam, a shear-resistant member is welded on the plate surface, the concrete shear-resistant member is tightly wrapped to form a shear-resistant connecting piece, and the shear-resistant connecting piece and the anchor pulling plates form a tension-resistant anchoring device together; the upper parts of the pair of anchor plates are exposed on the bridge floor and used for installing, fixing and tensioning an anchorage device at the tensioning end of the suspender, the anchor backing plate is positioned between the pair of anchor plates and welded with the plate surface of the anchor backing plate, and the two suspenders are simultaneously anchored on the anchor backing plate to form a double-suspender system.

The beneficial effects of the invention are mainly reflected in the following aspects:

firstly, the boom is tensioned and stretched to the bridge floor from an arch ring or the beam bottom, and the risk of high-altitude operation is reduced. The upper end of the suspender is adjusted to be a fixed end, and the fixed end anchor head is arranged on the arch ring without tensioning operation;

secondly, an anchor backing plate and a stiffening rib plate are welded at the upper end of the anchor pulling plate, a suspender is installed, tensioned, inspected and maintained on the bridge floor, the operation space is wide, the operation is convenient, and a special temporary operation platform under the beam is not needed;

thirdly, the tension of the suspender is uniformly transmitted to the concrete box girder by utilizing the anchor pull plate and the plurality of rows of shear nails welded on the anchor pull plate, the force transmission path is clear, and concrete cracking caused by local pressure-bearing stress concentration is avoided;

and fourthly, two suspenders are simultaneously anchored on the anchor backing plate to form a group of double-suspender system, and when maintenance and replacement are needed, the suspenders can be sequentially loosened and replaced one by one without arranging temporary suspenders. The internal force of one group of suspenders is borne by the two suspenders in sequence in the cable replacement process, and the original integral stress state of the bridge structure is not changed;

fifthly, the anchor head is hidden in a closed box body formed by the anchor pulling plate and the end sealing plate, so that the anchor head is prevented from being damaged by human or other external force, and the structural durability of the anchor head is improved;

sixthly, the anchoring structure can be integrally prefabricated and processed in a factory, the quality control is guaranteed, the manufacturing and mounting precision is high, and the construction quality reduction and the environmental pollution caused by field welding are avoided;

and seventhly, a tensioning screw passing pore channel is reserved in the beam body below the anchor head, and the tensioning screw passing pore channel has dual tensioning conditions on the bridge floor and at the beam bottom and is suitable for space requirements of various tensioning devices.

Drawings

The specification includes the following five figures:

FIG. 1 is a view of a prior art conventional boom anchor configuration;

FIG. 2 is a general layout view of the upper structure of an anchoring structure of a buried continuous beam-arch combined bridge crane rod according to the present invention;

FIG. 3 is a general layout and a schematic front view of the upper structure of an anchoring structure of a buried continuous beam-arch combined bridge crane rod according to the present invention;

FIG. 4 is a cross-sectional view taken along line I-I of FIG. 3;

fig. 5 is a schematic sectional view taken along line II-II in fig. 3.

The figures show the components and corresponding references: the structure comprises a suspender 1, arch ribs 2, a box girder 3, a suspender anchoring member 4, a cross beam 5, an anchor plate 6, a web plate 7, stiffening ribs 8, an anchor backing plate 9, a top sealing plate 10, a suspender tensioning end anchorage device 11, a side sealing plate 12, shear nails 13, a base plate 14, an embedded pipe 15, a beam body steel bar through hole 16, a water retaining platform 17, a beam top transverse common steel bar 18 and a beam body prestress steel beam 19.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Referring to fig. 1, a conventional common anchoring form is that a suspension rod 1 penetrates through a box girder 3 and a cross girder 5, an anchor backing plate 9 is embedded at the bottom of the cross girder, and the suspension rod 1 is anchored below the cross girder 5.

Referring to fig. 2, the embedded continuous beam-arch combined bridge hanger rod anchoring structure of the invention is characterized in that an arch rib 2 and a concrete box girder 3 are connected into a whole through a hanger rod 1, and the box girder 3 is provided with a cross beam 5 to reinforce the transverse rigidity of a girder body. The upper end of the suspender 1 is a fixed end and is fixedly connected with the arch rib 2 of the suspender 1 through an anchor head, and the anchor head is positioned in the abdominal cavity of the arch rib 2 or between the upper chord and the lower chord thereof. The lower end of the suspender 1 is a stretching end and forms anchoring connection with the box girder 3 and the cross beam 5 through a suspender anchoring component 4. The suspender anchoring member 4 comprises a pair of anchor plates 6 arranged at intervals along the bridge direction, the lower parts of the anchor plates 6 are embedded into concrete of the box girder 3 and the cross beam 5, the surface of the box girder is welded with shear-resistant members (shear nails 13 and base plates 14), the concrete shear-resistant members are tightly wrapped to form a shear-resistant connecting piece, and the shear-resistant connecting piece and the anchor plates 6 form a tensile anchoring device together. The upper parts of the pair of anchor plates 6 are exposed on the bridge floor and used for installing, fixing and tensioning an anchor 11 at the tensioning end of the hanging rods, an anchor backing plate 9 is positioned between the pair of anchor plates 6 and welded with the plate surface of the anchor backing plate, and the anchor backing plate 9 is simultaneously anchored with the two hanging rods 1 to form a double-hanging-rod system.

Referring to fig. 4 and 5, two suspenders 2 are simultaneously anchored on the anchor backing plate 9 to form a group of double-suspender system, and when maintenance and replacement are needed, the suspenders can be sequentially loosened and replaced one by one without arranging temporary suspenders. The internal force of a group of suspenders is borne by two suspenders in sequence in the cable changing process, and the original integral stress state of the bridge structure is not changed.

Referring to fig. 3 to 5, the side sealing plates 12 are welded to both sides of the upper portions of the pair of anchor plates 6 to form an anchor box structure, that is, the side sealing plates 12 seal the side surfaces of the anchor plates 6, so as to prevent the anchor 11 at the tensioning end of the boom from being damaged by human or other external forces, and improve the durability of the anchor head structure. The top welding of anchor case structure is closed with shrouding 10, avoids the inside ponding of anchor case structure. This anchor case structure, transverse interval sets up web 7 rather than face welded between two anchor plate 6, between adjacent web 7, welds stiffening rib 8 that sets up and 6 faces of anchor plate, the face welded of anchor backing plate 9. Referring to fig. 3, the upper ends of the pair of anchor pulling plates 6 are bent towards the inside of the anchor box structure to form a wedge-shaped structure with the web 7 and the stiffening ribs 8, so that the axial bearing capacity of the pressure-bearing anchoring of the anchor backing plate 9 is improved.

Referring to fig. 3 and 4, the shear member includes shear nails 13 welded at intervals on the lower plate surface of the anchor plates 6, and a bed plate 14 welded to the lower end of the pair of anchor plates 6. The anchor plate 6 is firmly connected with the box girder 3 and the concrete of the cross beam 5 through the shear nails 13, and the axial tension of the anchor plate 6 is gradually diffused and transmitted to the girder part.

Referring to fig. 3, the plate surfaces of the pair of anchor plates 6 are provided with beam body reinforcing steel bar passing holes 16 for passing the transverse common reinforcing steel bars 18 on the top surface of the box girder 3. The beam body reinforcing steel bar passing hole 16 can be adjusted according to the arrangement requirement of the beam body reinforcing steel bar, and the arrangement of the common reinforcing steel bar of the box girder 3 is not influenced. The box girder 3 is usually a prestressed concrete structure, and when the arrangement of the beam body prestressed steel bundles 19 and the shear nails 13 is interfered, the distance and the arrangement of the shear nails 13 can be properly adjusted, so that the beam body prestressed steel bundles 19 can continuously pass through, and the integral stress of the box girder structure is not influenced.

Referring to fig. 3 and 4, embedded pipes 15 communicated with the inner cavity of the anchor box structure are embedded in concrete of the box girder 3 and the cross beam 5, and the upper end ports of the embedded pipes 15 correspond to the installation positions of the anchor devices 11 at the tensioning ends of the hanger rods. The suspension rod 2 is stretched by a light jack with smaller operation space requirement, and the stretching is carried out between the top surface of the box girder and an anchorage device 11 at the stretching end of the suspension rod. When the working distance requirement of the adopted tensioning equipment is large and the operating space under the anchor is insufficient, the embedded pipes 15 arranged in the box girder 3 and the cross beam 5 can be utilized, the temporary screw rods penetrate through the embedded pipes 15 to be connected to the anchor head 11, the tensioning operation is carried out at the bottom of the cross beam 5, and the temporary screw rods can be removed after the tensioning is finished. By arranging the embedded pipe 15, the tensioning device can meet the requirements of different working spaces.

Referring to fig. 3, anchor arm plate 6 sets up concrete retaining platform 17 with 3 top surface junctures of box girder, and concrete retaining platform 17 top surface sets up the slope, avoids anchor arm plate 6 root ponding.

The invention relates to a concrete construction method of an embedded continuous beam-arch combined bridge lifting rod anchoring structure, which comprises the following steps: processing an anchor plate 6, a web plate 7, a stiffening rib 8, an anchor backing plate 9, a top sealing plate 10, a shear nail 13 and a base plate 14 in a factory, forming a preformed hole at a corresponding position, and welding the components to form a whole to form a suspender anchoring component 4; the bridge girder body 1 is generally cast by hanging basket sections, when the on-site girder section construction reaches a section with a suspender anchor, a girder body template is erected on a hanging basket, section reinforcing steel bars are bound, the suspender anchor member 4 is hoisted to a corresponding position, transverse common reinforcing steel bars 18 on the top of the box girder penetrate through the girder body reinforcing steel bar through holes 16, and then concrete is cast and vibrated to complete the construction of the section of box girder; after the beam parts are combined and arch ring erection is completed, a suspender is penetrated in the anchor backing plate 9, an anchorage device 11 at the tensioning end of the suspender is installed, a light jack is adopted to complete tensioning of the suspender 2 on the bridge floor, and then a side sealing plate 12 is installed to seal the anchor box structure.

The foregoing is illustrative of the principles of the present invention for an embedded continuous beam and arch composite bridge hanger anchoring structure, and is not intended to limit the invention to the specific structure and applications shown and described, and accordingly, all modifications and equivalents that may be resorted to are intended to fall within the scope of the invention.