CN109629454B - Bridging equipment and bridging method for lifting segmental beam on single side - Google Patents

Abstract

The invention relates to the technical field of bridge construction, in particular to bridge erecting equipment and a bridge erecting method for lifting a segmental beam on one side. The bridge erecting equipment for the unilateral lifting segmental girder comprises a bridge erecting machine with two parallel main trusses, wherein two lifting trolleys moving along the main trusses are arranged on the bridge erecting machine, two first supporting parts are arranged on the bridge erecting machine and used for fixing the bridge erecting machine on a bridge floor, and the two first supporting parts are symmetrically distributed on two sides of a middle buttress used for supporting a No. 0 block in the bridge; and two second supporting parts are further arranged on the bridge girder erection machine and are respectively fixed at two ends of the main truss. In the bridging equipment for the unilateral lifting segmental girder, which is provided by the invention, the supporting parts are arranged at the midspan end and the side span end of the bridge, so that the difficulty of asymmetric cantilever splicing construction of the bridge with the prefabricated structure is solved, and the suspension splicing construction of the bridge with the prefabricated structure can be carried out asymmetrically.

Description

Bridging equipment and bridging method for lifting segmental beam on single side

Technical Field

The invention relates to the technical field of bridge construction, in particular to bridge erecting equipment and a bridge erecting method for lifting a segmental beam on one side.

Background

At present, bridge cantilever assembly of a prefabricated structure is mainly carried out by adopting a cantilever balance assembly process, namely, prefabricated segmental beams on two sides of a bridge pier are symmetrically lifted one by means of a mobile bridge deck bridge girder erection machine which is symmetrically arranged until assembly of all the prefabricated segmental beams on two sides of the bridge pier is completed.

When the process is adopted, the bridge deck bridge girder erection machine moves forwards and the corresponding beam section hoisting position moves forwards correspondingly when a group of corresponding prefabricated section girders are installed, so that the prefabricated section girders are required to be directly transported to the position right below the symmetrically arranged bridge deck crane and can be vertically hoisted and symmetrically installed, and the application has certain limitation.

In actual construction, the bridge adopting the cantilever assembly technology usually needs to span structures such as a river channel, a railway, a highway and the like, and if a movable bridge deck crane is adopted for installation, the transportation conditions on the premise cannot be met, so that 'symmetrical hoisting and installation on two sides of a pier cannot be realized'. The economic cost to be paid to meet the transportation conditions is very high.

Disclosure of Invention

The invention aims to provide bridge erecting equipment and a bridge erecting method for lifting a segmental beam on one side, and aims to solve the technical problem that an existing bridge erecting machine needs to move frequently and must be symmetrically lifted when a bridge is erected.

In order to solve the technical problem, the invention provides bridging equipment for lifting a segmental beam on one side, which comprises a bridging machine with two parallel main trusses, wherein two lifting trolleys moving along the main trusses are arranged on the bridging machine, two first supporting parts are arranged on the bridging machine and used for fixing the bridging machine on a bridge floor, and the two first supporting parts are symmetrically distributed on two sides of a middle buttress used for supporting a No. 0 block in a bridge;

the bridge girder erection machine is also provided with two second supporting parts which are respectively fixed at two ends of the main truss;

one end of the main truss extends to a mid-span closure position adjacent to the middle buttress and is fixedly connected with the foundation through the second supporting part and a connecting piece;

the other end of the main truss extends to the side buttress adjacent to the middle buttress; and is fixedly connected with the side buttress through the second supporting part.

Further, the first supporting part comprises two first supporting legs for respectively connecting the two parallel main trusses with the bridge deck.

Furthermore, the two first supporting legs are connected with an embedded steel plate on the bridge.

Further, the first support leg comprises two upright columns and a connecting rod which are arranged in parallel, and the two upright columns are fixedly connected through the connecting rod;

the stand columns in the two first supporting legs are connected with the embedded steel plates.

Further, the upright post is also symmetrically provided with stabilizer bars so as to connect the upright post with the bridge deck.

Further, the second support portion comprises two second legs;

the two second support legs are positioned at one end of the main truss and are used for fixedly connecting the two parallel main trusses to the side buttress respectively;

the two second supporting legs are positioned at the other end of the main truss and are used for respectively fixing the two parallel main trusses on the connecting piece;

the connecting piece is fixedly connected with the foundation.

Furthermore, the second landing leg comprises two upright columns and a connecting rod which are arranged in parallel, and the two upright columns are fixedly connected through the connecting rod.

Further, the connecting piece comprises a truss girder and two brackets;

the bracket is fixed on a foundation;

the truss beam is erected on the two brackets;

the bottom of the second support portion is fixed to the truss girder.

Further, the support comprises a pile foundation built in a foundation, a concrete bearing platform covered on the pile foundation, a steel plate pre-embedded in the concrete bearing platform and an upright post fixed on the steel plate;

the truss girder is fixed on the upright columns in the two brackets.

In order to solve the technical problem, the invention also provides a bridging method of the unilateral lifting section beam, which comprises the following steps of:

s1, moving the two lifting trolleys to one end of the side span of the bridge;

s2, hoisting the sectional beam by using the first hoisting trolley close to the bridge span;

s3, transferring the lifted section beam to the other end of the side span of the bridge for splicing;

s4, hoisting the sectional beam by the second hoisting trolley far away from one end of the side span of the bridge in the process of transferring the sectional beam by the first hoisting trolley;

s5, putting the section beam lifted by the second lifting trolley at one end of the side span of the bridge for assembling;

s6, judging whether the bridge is assembled to the side buttress and the midspan closure position, if so, entering the step S7, otherwise, repeating the steps S1-S5;

s7, judging whether another middle buttress adjacent to the middle buttress is assembled to the midspan closure position and another side buttress, if so, entering the step S8, otherwise, transferring the bridging equipment to the another middle buttress and repeating the steps S1-S6;

s8: completing the closure at the mid-span closure position;

the first lifting trolley is used for lifting a section beam, and the section beam is rotated to pass through a space between the two main trusses;

and when the first lifting trolley transfers the section beam to the assembling position, the section beam is rotated so that the assembling surface of the section beam is attached to the assembling surface of the bridge.

In the bridging equipment for the unilateral lifting segmental girder, which is provided by the invention, the supporting parts are arranged at the midspan end and the side span end of the bridge, so that the difficulty in asymmetric cantilever splicing construction of the bridge with a prefabricated structure is solved, the suspension splicing construction of the bridge with the prefabricated structure can be carried out asymmetrically, the application range of the bridge cantilever splicing method is widened, the bridge is suitable for a scene that the bridge cannot adopt a movable bridge deck crane to carry out cantilever balanced splicing due to the fact that the bridge strides over the existing structures such as a river channel, a railway, a highway and the like, the cost can be reduced, the economic investment is reduced, and the construction efficiency is improved.

Drawings

Fig. 1 is a schematic view of a setting structure of a bridge erecting device provided in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken at A-A of FIG. 1 in accordance with an embodiment of the present invention;

fig. 3 is a schematic end-face structure diagram of a bridging device on a bridge according to an embodiment of the present invention;

fig. 4, 5, 6, 7 and 8 are schematic diagrams illustrating a bridging process of a single-sided lifting segment girder according to an embodiment of the present invention;

fig. 9 is a flowchart of a bridging method according to an embodiment of the present invention.

Detailed Description

According to the above description, the existing bridge with the prefabricated structure mainly adopts the symmetrical suspension assembly bridge erecting equipment and the bridge erecting method to carry out bridge erecting construction during construction, that is, the prefabricated section beams are hoisted at two side span ends of the bridge simultaneously in the construction process, and then the assembly work is carried out, so that the hoisting work of all the section beams can not be completed at one side span end of the bridge. In the construction process of the bridge with the prefabricated structure spanning riverways, railways, highways and the like, the construction is often inconvenient to adopt symmetrical suspension splicing bridge erecting equipment and a bridge erecting method, and finally the construction difficulty is large, the efficiency is low and the cost is high.

Aiming at the problems in bridge construction, the invention creatively improves the bridge erecting equipment and the bridge erecting method, realizes the purpose of hoisting the segmental beam at one side in the construction process of the bridge with the prefabricated structure, and reduces the construction difficulty in the construction environment of crossing river channels, railways, highways and the like.

The bridging device and the bridging method for a single-side lifting section beam according to the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the appended claims and the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Example 1

The embodiment provides a bridging device for a single-side lifting section beam. As shown in fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic view of an arrangement structure of the bridging device on a bridge according to this embodiment, fig. 2 is a schematic view of a cross section a-a in fig. 1 according to this embodiment, and fig. 3 is a schematic view of an end face structure of the bridging device on a bridge according to this embodiment. The bridge erecting equipment comprises a bridge erecting machine 1 with two parallel main trusses 11, two lifting trolleys 12 which move along the main trusses 11 are arranged on the bridge erecting machine 1, two first supporting parts 2 are arranged on the bridge erecting machine 1 and used for fixing the bridge erecting machine 1 on a bridge deck of a bridge 3, and the bridge erecting machine 1 can adopt a bridge erecting machine with two parallel triangular truss type main trusses commonly used in the prior art. On the basis of the existing bridge girder erection machine, in order to realize the purpose of always hoisting the segmental girder 31 on one side, the two first supporting parts 2 are symmetrically distributed on two sides of the middle buttress 32 for supporting the 0# block in the bridge girder 3. Meanwhile, two second supporting parts 4 are also arranged on the bridge girder erection machine 1 and are respectively fixed at two ends of the main truss 11. One end of the main truss 11 extends to a mid-span closure position adjacent to the middle buttress 32 and is fixedly connected with the foundation 6 through the second supporting part 4 and a connecting piece 5; the other end of the main truss 11 extends to an edge pier 33 adjacent to the middle pier 32; and is fixedly connected to the side pier 33 by the second support portion 4. Because the two ends of the main truss 11 are supported, the main truss 11 cannot overturn when the segmental beam 31 is lifted on one side.

It should be noted that the bridging device plays an important role in bridge construction. Therefore, in order to meet a predetermined strength requirement and reduce the investment cost, the main girder 11, the first support section 2, the second support section 4, and the like in the bridge erecting equipment may be made of steel. For example, when constructing a three-span bridge, the main girder 11 may be manufactured to have a length of 84.325 m, a height of 3.1 m, and a width of 1.5 m, and the main girder 11 is fixed to the two first supporting parts 2 and the two second supporting parts 4 by welding.

Further, the first support part 2 comprises two first legs for respectively connecting the two parallel main trusses 11 to the deck so as to more firmly fix the main trusses 11 to the deck. Of course, it is also possible to embed the steel plate 34 on the bridge deck, and connect the two first legs with the embedded steel plate 34 on the bridge 3, so as to improve the stability of the two first legs.

In order to save cost and obtain the first supporting part 2 with enough strength, when manufacturing, the first leg comprises two columns 21 and a connecting rod which are arranged in parallel, and two columns 21 in the same first leg are fixedly connected through the connecting rod. And the embedded steel plates 34 are connected with the upright posts 21 in the two first legs. In actual manufacturing, a steel pipe with a diameter of 609mm can be used as the upright post 21, profile steel can be used as the connecting rod, and the first supporting leg is formed by welding in a welding manner. Of course, when the upright posts are connected with the embedded steel plates 34 on the bridge 3, the upright posts can also be directly connected in a welding mode.

In addition, 30# channel steel can be used as the stabilizer bar 22, and is connected between the upright post 21 and the bridge deck by welding, and is symmetrically arranged as shown in the figure, so as to improve the stabilizing effect.

Likewise, the second support portion 4 comprises two legs, and for ease of description, the legs in the second support portion 4 will be referred to as second legs. The two second legs at one end of the main girder 11 are mainly used to fixedly connect the two parallel main girders 11 to the side buttresses 33, respectively, according to the setting function of the second support part 4. And the two second legs at the other end of the main girder 11 are used for respectively fixing the two parallel main girders 11 on the connecting member 5. Since one end of the main truss 11 is at the mid-span closure position of the bridge 3, the one end of the main truss 11 and the first support part 2 are in a suspended state. As can be seen from the foregoing description of the connecting member 5, in order to prevent the one end of the main girder 11 and the first supporting part 2 from being suspended, the connecting member 5 is fixedly connected to the foundation 6.

The second supporting leg also comprises two upright columns and a connecting rod which are arranged in parallel, and the two upright columns are fixedly connected through the connecting rod. Because the second supporting leg and the first supporting leg both play a supporting role, the upright post and the connecting rod in the second supporting leg can adopt the same structure as the first supporting leg. For the sake of distinction, the upright in said second leg is called second upright and is marked 41 in the figure.

Since the connecting piece 5 needs to be connected to the foundation 6 while also supporting the second support part 2. Thus, the connector 5 may comprise a truss girder 51 and two brackets 52. The specific structure may be set according to an actual construction scene, for example, in such a manner that: the brackets 52 are fixed to the foundation 6, the truss girder 51 is bridged between the two brackets 52, and the bottom of the second support portion 4 is fixed to the truss girder 51.

Further, the support 52 includes a pile foundation built in a foundation, a concrete bearing platform covering the pile foundation, a steel plate pre-embedded in the concrete bearing platform, and an upright post fixed on the steel plate; truss girder 51 is fixed two in support 52 on the stand, when actual manufacture, the pile foundation can adopt the drilled pile of diameter 600mm, and specific quantity can be set for according to actual construction needs, for example 4, 8 etc.. The size of the concrete bearing platform covering the pile foundation can also be set according to actual needs, for example, each concrete bearing platform bearing the support can be made to be 3.5m long, 3.5m wide and 1m high. The strength of the concrete bearing platform can reach C35. The upright post can adopt four steel pipes with the diameter of 609mm to form a quadrangular prism so as to improve the stability, and the four steel pipes can be reinforced by section steel. When the vertical columns are fixedly connected with the truss girder 51, two pieces of H500-shaped steel may be welded to the vertical columns of the two brackets 52, respectively, to bear the truss girder 51. The truss girder 51 may also be formed by welding profile steels, and in the construction of a three-span bridge, the truss girder 51 may be set to have a height of 3 m and a span of 24 m.

The embodiment also provides a bridging method of a single-side lifting segment girder, which is described in detail by taking a three-span bridge as an example and combining the schematic bridging process of the single-side lifting segment girder shown in fig. 4, 5, 6, 7 and 8 and the flowchart of the bridging method shown in fig. 9. The method carries out bridging construction by utilizing the bridging equipment provided by the embodiment, and simultaneously, the method also comprises the following steps:

s1, moving the two lifting trolleys 12 to one end of a side span of a bridge 3;

s2, firstly hoisting the sectional beam 31 by using a first hoisting trolley 121 close to the middle of the span of the bridge 3;

s3, transferring the lifted section beam 31 to the other end of the side span of the bridge 3 for splicing;

s4, in the process that the first lifting trolley 121 transfers the sectional beam 31, the second lifting trolley 122 far away from one end of the side span of the bridge 3 lifts the sectional beam 31;

s5, placing the section beam 31 lifted by the second lifting trolley 122 at one end of the side span of the bridge 3 for assembling;

s6, judging whether the bridge 3 is assembled to the side buttress 33 and the midspan closure position, if so, entering a step S7, otherwise, repeating the steps S1-S5;

s7, judging whether another middle buttress 32 adjacent to the middle buttress 32 is assembled to the mid-span closure position and another side buttress 33, if so, entering a step S8, otherwise, transferring the bridging equipment to the other middle buttress 32 and then repeating the steps S1-S6; (ii) a

And S8, completing the closure at the mid-span closure position.

It should be noted that when the bridge erecting equipment is arranged on one middle buttress 32, and the section beam 31 is respectively assembled to the mid-span closure position and the side buttress 33, the assembly work of the middle buttress is considered to be completed, and when the two middle buttresses 32 of the three-span bridge are assembled, the closure construction is completed at the mid-span closure position.

Further, in the process that the first trolley 121 lifts the segment beam 31, the segment beam 31 is rotated to pass through the space between the two main trusses 11; when the sectional beams 31 are lifted, the assembling surfaces of the sectional beams 31 are usually arranged along the extending direction of the bridge girder 3 for convenience of lifting, but the sectional beams 31 arranged in this way may not pass through the space between the two main girders 11 arranged in parallel, so that during the actual transportation process, the angle of the sectional beams 31 is adjusted to enable the sectional beams 31 to pass through the space between the two main girders 11. The sectional plane of the sectional beam 31 is generally perpendicular to the extending direction of the sectional beam 31, so that the lifted sectional beam 31 can be rotated by 90 degrees.

When the first trolley 121 transfers the segment beam 31 to the splicing position, the segment beam 31 is rotated to make the splicing surface of the segment beam fit with the splicing surface of the bridge. If it is rotated 90 degrees during the hoisting process as explained above, it is necessary to rotate 90 degrees in the opposite direction when transferring the sectional beams 31 to the erection position in order to ensure the erection position of the erection block toward the bridge 3.

In summary, in the bridging apparatus for a unilateral lifting segmental girder provided in this embodiment, the supporting portions are disposed at the midspan end and the side span end of the bridge, so that the difficulty in asymmetric cantilever splicing construction of the bridge with a prefabricated structure is solved, the suspension splicing construction of the bridge with the prefabricated structure can be performed asymmetrically, the application range of the bridge cantilever splicing method is widened, the bridge is suitable for a scene that the bridge cannot adopt a mobile bridge deck crane to perform cantilever balanced splicing due to the fact that the bridge spans structures such as a river channel, a railway, a highway and the like, the cost is reduced, the economic investment is reduced, and the construction efficiency is improved.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (1)

1. A bridging method of a unilateral lifting segmental beam adopts bridging equipment which comprises a bridging machine with two parallel main trusses, wherein the bridging machine is provided with a first lifting trolley and a second lifting trolley which move along the main trusses, and the bridging machine is provided with two first supporting parts for fixing the bridging machine on a bridge floor; the two first supporting parts are symmetrically distributed on two sides of a middle buttress for supporting a No. 0 block in the bridge; the bridge girder erection machine is also provided with two second supporting parts which are respectively fixed at two ends of the main truss; one end of the main truss extends to a mid-span closure position adjacent to the middle buttress and is fixedly connected with the foundation through the second supporting part and a connecting piece; the other end of the main truss extends to the side buttress adjacent to the middle buttress; and is fixedly connected with the side buttress through the second supporting part;

the method is characterized by comprising the following steps:

s1, moving the two lifting trolleys to one end of the side span of the bridge;

s2, hoisting the sectional beam by using the first hoisting trolley close to the bridge span;

s3, transferring the lifted section beam to the other end of the side span of the bridge for splicing;

s4, hoisting the sectional beam by the second hoisting trolley far away from one end of the side span of the bridge in the process of transferring the sectional beam by the first hoisting trolley;

s5, putting the section beam lifted by the second lifting trolley at one end of the side span of the bridge for assembling;

s6, judging whether the bridge is assembled to the side buttress and the midspan closure position, if so, entering the step S7, otherwise, repeating the steps S1-S5;

s7, judging whether another middle buttress adjacent to the middle buttress is assembled to the midspan closure position and another side buttress, if so, entering the step S8, otherwise, transferring the bridging equipment to the another middle buttress and repeating the steps S1-S6;

s8: completing the closure at the mid-span closure position;

the first lifting trolley is used for lifting a section beam, and the section beam is rotated to pass through a space between the two main trusses;

and when the first lifting trolley transfers the section beam to the assembling position, the section beam is rotated so that the assembling surface of the section beam is attached to the assembling surface of the bridge.

Images