CN214783195U

CN214783195U - Guide beam for pushing steel box girder

Info

Publication number: CN214783195U
Application number: CN202022847518.2U
Authority: CN
Inventors: 任金冬; 陈立洪; 董权锋; 卢华; 龙起耀
Original assignee: China Construction Science and Industry Corp Ltd
Current assignee: China Construction Science and Industry Corp Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-11-19
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a nose girder that is used for steel box girder to push away, include: the steel box girder comprises two guide girder main girders, the root parts of the guide girder main girders are used for being connected with the front end of the steel box girder, the guide girder main girders comprise structures formed by connecting profile steel, steel plates and stiffening plates, and the guide girder main girders are in multi-stage section height change in the length direction; and the transverse connection truss is used for transversely connecting the two guide beam main beams. The guide beam main beam comprises a structure formed by connecting profile steel, steel plates and stiffening plates, the structure is in a step shape in the length direction, the sectional area of the guide beam main beam is sequentially reduced, the guide beam meets the stress, the deflection value of the front end of the guide beam is reduced, the material consumption for manufacturing the guide beam is reduced, and the manufacturing cost of the guide beam is reduced. The utility model discloses a nose girder for top of steel box girder top pushes away can wide application in bridge construction field.

Description

Guide beam for pushing steel box girder

Technical Field

The utility model relates to a bridge construction especially relates to a nose girder that is used for steel box girder top to push away with technical field.

Background

When the steel box girder is installed in the pushing construction, a guide girder needs to be installed at the front end of the steel box girder to assist the situation that the span between the bridge piers is large in the pushing process of the steel box girder, the stress state of the steel box girder in the pushing construction process is changed, the maximum single-point counter force of the steel box girder in the pushing process is reduced, and the deformation of the steel box girder is reduced.

With the increasing maturity of the bridge pushing technology, the structural form of the guide beam mostly adopts large-section H-shaped steel, and a local stiffening plate reinforcing form is adopted, but the deflection value of the guide beam in the structural form is larger.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a nose girder that is used for steel box girder top to push can reduce the deflection value of nose girder front end.

According to the utility model discloses a nose girder that is used for steel box girder top to push of first aspect embodiment, include: the steel box girder comprises two guide girder main girders, the root parts of the guide girder main girders are used for being connected with the front end of the steel box girder, the guide girder main girders comprise structures formed by connecting profile steel, steel plates and stiffening plates, and the guide girder main girders are in multi-stage section height change in the length direction; and the transverse connection truss is used for transversely connecting the two guide beam main beams.

According to the utility model discloses a nose girder that is used for steel box girder top to push has following beneficial effect at least: the root of the guide beam is formed by connecting profile steel, steel plates and stiffening plates, the main beam of the guide beam is in a step shape in the length direction, and the sectional area of the main beam of the guide beam is sequentially reduced, so that the front end of the guide beam is reduced in flexibility while the guide beam meets the stress, the material consumption for manufacturing the guide beam is reduced, and the manufacturing cost of the guide beam is reduced.

According to some embodiments of the utility model, nose girder rear end include by shaped steel the steel sheet reaches the stiffener passes through the structure that lattice formula built-up connection formed.

According to some embodiments of the invention, the profile steel is H-profile steel.

According to some embodiments of the invention, the transverse connection truss is formed by connecting round tubes.

According to some embodiments of the invention, the pipe is a steel pipe.

According to some embodiments of the utility model, the horizontal contact truss still is provided with the bracing piece, bracing piece one end with horizontal contact truss connects, the other end of bracing piece with the nose girder is connected.

According to some embodiments of the utility model, the bracing piece is four, the bracing piece set up in horizontal connection truss both sides.

According to some embodiments of the utility model, the horizontal contact truss is provided with the multiunit, the horizontal contact truss set up in nose girder variable cross section department.

According to some embodiments of the invention, the transverse connection truss is provided with three groups.

According to some embodiments of the utility model, the lower terminal surface of nose girder is on the coplanar.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is an overall schematic diagram of an embodiment of the present invention;

fig. 2 is a top view of an embodiment of the present invention;

fig. 3 is a front view of an embodiment of the invention;

FIG. 4 is a schematic view of the transverse link truss of the present embodiment;

fig. 5 is a sectional view of B-B in fig. 3.

Reference numerals: root 110, section steel 111, stiffening plate 112, steel plate 113, front end 120, rear end 130, transverse connection truss 210 and support rod 211.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, the guide beam for steel box girder pushing according to the embodiment of the present invention includes a guide beam main beam and a transverse connection truss 210.

The guide beam main beam includes a root 110, a front end 120, and a rear end 130. The root 110 of the main girder of the guide beam is used for being connected with the front end of the steel box girder, and the guide beam at the front end of the guide beam reaches one end of the next pier first in the pushing process of the steel box girder.

Specifically, the guide beam main beam is provided with two pieces, the root 110 of the guide beam main beam is used for being connected with the front end 120 of the steel box girder, the guide beam main beam comprises a structure formed by connecting section steel 111, a steel plate 113 and a stiffening plate 112, and the guide beam main beam is in multi-stage section height change in the length direction; the cross tie truss 210 is used to connect two main beams of guide beams. Furthermore, the rear end 130 of the main beam of the guide beam is combined by the lattice of the section steel 111, the main beam of the guide beam is in a step shape in the length direction, and the sectional area of the main beam of the guide beam is sequentially reduced, so that the deflection value of the front end 120 of the guide beam is reduced while the guide beam meets the stress, the material consumption for manufacturing the guide beam is reduced, and the manufacturing cost of the guide beam is reduced. In the splicing of the main beams of the guide beams, stiffening plates 112 are also provided, as shown in fig. 5. The stiffener 112 connects the steel plate 113 and the section steel 111 to improve the structural rigidity and structural stability of the pilot beam. It is understood that the stiffener plates 112 are arranged accordingly according to actual requirements. For example, the stiffening plates 112 may also be provided on the section steel 111 to enhance the rigidity of the section steel according to actual needs; similarly, stiffening plates 112 may also be arranged between the

steel profiles

111 and 111 to improve the structural stability of the guide beam.

It should be noted that the lower end faces of the main beams of the guide beams are on the same plane, as shown in fig. 3. In the embodiment, the lower end surfaces of the main beams of the guide beams are on the same plane, and corresponding supporting pieces do not need to be manufactured additionally when the main beams are manufactured, so that the manufacture of the main beams of the guide beams is facilitated, and the manufacturing period of the main beams of the guide beams is shortened.

Referring to fig. 1 and 3, the rear end 130 of the girder of the guide beam includes a structure in which section steels 111, steel plates 113, and stiffener plates are connected by lattice combination. In general, a guide beam made of large-section steel sections 111 and stiffening plates requires a large number of steel sections, and the steel sections and the steel plates 113 are expensive to purchase and have a long purchase period. In some embodiments of the present invention, the rear end of the main beam of the guide beam is formed by lattice-type combination of the materials required for manufacturing the guide beam, such as the section steel 111, the steel plate 113 and the stiffening plate, etc., thereby reducing the steel required for manufacturing the guide beam and reducing the manufacturing cost of the guide beam. The structural steel 111 and the steel plate 113 required by the lattice type combination can adopt the structural steel 111 excess stock and the steel plate 113 excess stock in a processing plant, so that the purchasing time of steel is reduced, and the manufacturing cost of the guide beam is further reduced.

In some of these embodiments, the section steel 111 is an H-section steel. The H-shaped steel has the characteristics of strong bending resistance, simple construction and light structure weight in all directions. In practical application, according to the actual working condition of the steel box girder pushing process and the maximum distance between piers, corresponding H-shaped steel and steel plates 113 are selected for manufacturing the guide girder. In the present embodiment, the guide beam mainly includes cross-sectional dimension steel sections 111 such as BH900 × 350 × 18 × 30, BH700 × 350 × 18 × 30, HW400 × 13 × 21, and HW350 × 12 × 19, and the guide beam main beam according to the embodiment of the present invention is manufactured by performing lattice combination connection through these steel sections 111, and the weight of the guide beam itself is reduced on the premise of meeting the usage requirement. The cross-sectional area of the guide beam is reduced in sequence from the root 110 of the guide beam main beam to the front end 120 of the guide beam main beam, the guide beam main beam is arranged in a step shape, the front end 120 of the guide beam main beam is small, the root 110 of the guide beam main beam is large, the deflection value of the front end 120 of the guide beam is reduced, and the guide beam is prevented from being deformed greatly due to overlarge self weight in the using process.

In order to increase the structural strength of the guide beams, a transverse connection truss 210 is arranged between the two main beam guide beams. In the embodiment of the present invention, the transverse connection truss 210 is formed by connecting round pipes, as shown in fig. 4. Further, the round pipe is a steel pipe. As an improvement of the above embodiment, the transverse connection truss 210 is further provided with a support rod 211, one end of the support rod 211 is connected with the transverse connection truss 210, and the other end of the support rod 211 is connected with the main beam of the guide beam. Set up corresponding bracing piece 211 in the both sides of horizontal relation truss 210, bracing piece 211 one end is connected on horizontal relation truss 210's chord member, and the other end of bracing piece 211 is connected on nose girder web, has optimized the atress condition of nose girder when pushing away, has increased the utility model discloses a structural stability who is used for the nose girder that steel box girder pushed away. It is understood that the number of the supporting rods 211 is four, and the supporting rods 211 are disposed at both sides of the lateral connection truss 210, as shown in fig. 2. It should be understood that the number of the cross-linking trusses 210 is set accordingly according to the length of the guide beams. The transverse connection trusses 210 are arranged in a plurality of groups, and the transverse connection trusses 210 are arranged at the variable cross sections of the main beams of the guide beams. The transverse connection truss 210 is arranged at the variable cross section of the main girder of the guide girder, so that the connection stability of the variable cross section of the main girder is enhanced, and the stress structure of the variable cross section of the main girder of the guide girder is optimized. In this embodiment, the cross-linking trusses 210 are provided in three groups.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. A nose girder for steel box girder jacking, comprising:

the steel box girder comprises two guide girder main girders, the root parts of the guide girder main girders are used for being connected with the front end of the steel box girder, the guide girder main girders comprise structures formed by connecting profile steel, steel plates and stiffening plates, and the guide girder main girders are in multi-stage section height change in the length direction; and

and the transverse connection truss is used for transversely connecting the two guide beam main beams.

2. The guide beam for steel box girder jacking according to claim 1, wherein the rear end of the main beam of the guide beam comprises a structure formed by connecting the section steel, the steel plate and the stiffening plate in a lattice combination.

3. The guide beam for steel box girder jacking according to claim 2, wherein the section steel is H-section steel.

4. The guide beam for steel box girder jacking according to claim 1, wherein the cross-linking truss is formed by connecting round pipes.

5. The guide beam for steel box girder jacking according to claim 4, wherein the round tube is a steel tube.

6. The guide beam for pushing the steel box girder according to claim 1 or 4, wherein the transverse connection truss is further provided with a support rod, one end of the support rod is connected with the transverse connection truss, and the other end of the support rod is connected with the main beam of the guide beam.

7. The guide beam for steel box girder jacking according to claim 6, wherein the number of the support rods is four, and the support rods are arranged on both sides of the transverse connection truss.

8. The guide beam for pushing the steel box girder according to claim 1 or 4, wherein a plurality of groups of the transverse connection trusses are arranged, and the transverse connection trusses are arranged at the variable cross section of the main beam of the guide beam.

9. The guide beam for steel box girder jacking according to claim 8, wherein said cross-linking girders are provided in three groups.

10. The guide beam for steel box girder jacking according to claim 1, wherein the lower end faces of the main beam of the guide beam are on the same plane.