CN221566860U - Pier top large cantilever rear anchor type lifting frame for integrally lifting arch rib of arch bridge - Google Patents

Abstract

The utility model relates to a pier-top large cantilever rear anchor type lifting frame for integrally lifting arch ribs of an arch bridge, which comprises two towers with rectangular cross sections, wherein the two towers are respectively arranged on two sides of a pier-top transverse bridge, each tower comprises 4 upright posts, the lower end of each upright post is anchored with a pier-top embedded part, an upper longitudinal beam is fixedly arranged between the upper ends of each upright post along the bridge, two ends of each upper longitudinal beam extend out of a cantilever in the midspan direction and the side span direction respectively, an arch rib lifting device is fixedly arranged at the top of the cantilever end of each upper longitudinal beam on each tower in the midspan direction, an operation platform is arranged between the tops of the cantilever ends of the upper longitudinal beams in the side span direction, a plurality of anchoring steel strands vertically penetrate through a cross beam of the operation platform in the side span direction, and the lower end of each anchoring steel strand is anchored with an arch bridge side span section or a lower bearing platform. The utility model has the advantages of less consumption of materials, and good overall stability and safety.

Description

Pier top large cantilever rear anchor type lifting frame for integrally lifting arch rib of arch bridge

Technical Field

The utility model belongs to the technical field of bridge construction, relates to steel structure arch bridge construction, and in particular relates to a pier top large cantilever rear anchor type lifting frame for integrally lifting arch ribs of an arch bridge.

Background

The arch rib construction method of the steel structure arch bridge has a plurality of methods, such as a bracket in-situ assembling method, a swivel method, a cable hanging method, an integral lifting method and the like, and each method has respective advantages and disadvantages and use environments. The bracket in-situ assembling method is to set up a bracket at a bridge position and assemble an arch rib on the bracket, and is suitable for a girder-first and arch-later construction method or a river-crossing bridge without navigation requirements; the turning method is to assemble the arch rib on the shoreside or bridge low support, then turn the arch rib to the installation height by the method of horizontal turning, vertical turning or combination of horizontal turning and vertical turning, and the method is generally applicable to land environments or river-crossing arch bridges with shallower water levels; the cable hanging method is to erect cable hanging between two banks and to hoist the arch ribs section by section in place, and the method can be used for erecting arch ribs of various arch bridges, but is generally used in mountain gorge areas, and cable towers can be erected by means of mountain potentials so as to reduce the self height of the cable towers; the integral lifting method is to integrally assemble the arch rib at different positions, then transfer the arch rib to the bridge position and integrally lift the arch rib to the installation height, and the method needs to set up an arch rib lifting frame at the bridge position, so that the lifting frame is not too high in height due to safety and cost, and the method is generally used for installing the arch rib of an upper-bearing type arch bridge or a middle-bearing type arch bridge with lower height or constructing a lower-bearing type arch bridge by a girder-first and arch-second method.

The construction method comprises the steps that a certain bridge is a Jialing river bridge project, a bridge main bridge is designed to be a lower-bearing steel box tie-bar steel arch bridge, two side spans are cast-in-situ beams, arch seats are arranged at pier tops of joints of the cast-in-situ beams and the steel beams, two sides of a construction area are mountain bodies, the mountain bodies are slow, navigation is guaranteed during construction, and the main bridge is constructed by adopting a arch-first-and-beam-second method. If the bracket in-situ assembling method is adopted, the bracket is required to be erected in water, so that navigation is influenced, and the height of the bracket is too high; the construction is performed by adopting a swivel method, and the construction cannot be directly swiveled no matter the construction is combined with horizontal rotation, vertical rotation or horizontal and vertical rotation due to the influence of the pier body structure; because two bank slopes are slow, a higher cable tower needs to be erected, the corresponding cable tower has larger anchorage volume, large engineering quantity and overhigh cost; in comprehensive consideration, the arch rib is installed by adopting an integral lifting method, but according to the traditional integral lifting method, a lifting tower is required to be erected in a river, and the height of the lifting tower is correspondingly higher due to the high installation height of the arch rib, so that the material consumption is high, and the safety is lower.

Disclosure of Invention

The utility model aims to solve the problems, and provides the pier top large cantilever rear anchor type lifting frame for integrally lifting the arch rib of the arch bridge by combining the self structure of the bridge and the site environment, so that the stability and the safety of the lifting frame in a construction state are ensured while the material consumption is reduced.

The technical scheme of the utility model is as follows:

A anchor hoisting frame behind pier top big cantilever that is used for arched bridge arch rib to wholly promote, its characterized in that: the lifting frame is arranged at the top of the arch bridge pier and comprises two towers with rectangular cross sections, the two towers are respectively arranged at two sides of the pier top transverse bridge, each tower comprises 4 upright posts, the lower end of each upright post is anchored with a pier top embedded part, parallel connection and diagonal bracing are welded between the 4 upright posts of each tower, and a connecting truss is welded between the two tower frames in the transverse bridge direction; an upper longitudinal beam is fixedly erected between the upper ends of every two upright posts along the bridge, two ends of each upper longitudinal beam extend out of a cantilever in the midspan direction and the side span direction respectively, an arch rib lifting device is fixedly installed at the top of the cantilever end of each upper longitudinal beam on each tower in the midspan direction, an operation platform is erected between the tops of the cantilever ends of each upper longitudinal beam on the two towers in the side span direction and comprises two transverse beams arranged in the transverse bridge direction, a plurality of connecting rods are welded between the two transverse beams, a plurality of anchoring steel strands vertically penetrate through the transverse beams of the operation platform in the side span direction, the upper end of each anchoring steel strand is anchored with the transverse beams, and the lower end of each anchoring steel strand is anchored with the bridge span section or the lower bearing platform of the arch bridge side.

According to the utility model, the self structure of the bridge and the site environment are combined, the lifting frame is arranged on the pier top, and the material consumption can be reduced by means of the height of the pier; the lifting frame is provided with a large cantilever towards the midspan side for installing the lifting device to lift the arch rib, and the lifting frame is provided with a cantilever towards the side span side for anchoring with the side span cast-in-situ beam, so that the overall stability and safety of the lifting frame are ensured, and the difficulty in installation and construction of the bridge type arch rib is solved.

Drawings

FIG. 1 is a forward side view of the present utility model;

FIG. 2 is a transverse bridge elevational view of the present utility model;

FIG. 3 is a schematic plan view of the present utility model;

fig. 4 is a schematic view of the construction state of the present utility model.

Detailed Description

As shown in fig. 1, 2 and 3, the lifting frame is arranged at the top of a pier 1 of an arch bridge, the lifting frame comprises two towers with rectangular cross sections, the two towers are respectively arranged at two sides of a pier top transverse bridge, each tower comprises 4 upright posts 2, the lower end of each upright post 2 is anchored with a pier top embedded part 3, a parallel connection 4 and an inclined strut 5 are welded between the 4 upright posts 2 of each tower, and a connecting truss 6 is welded between the two towers in the transverse bridge direction; an upper longitudinal beam 7 is fixedly erected between the upper ends of every two upright posts 2 along the bridge, two ends of each upper longitudinal beam extend out of a cantilever in the midspan direction and the side span direction respectively, an arch rib lifting device 8 is fixedly installed at the top of the cantilever end of each upper longitudinal beam 7 on each tower in the midspan direction, an operation platform is erected between the tops of the cantilever ends of the upper longitudinal beams on the two towers in the side span direction, the operation platform comprises two transverse beams 9 which are arranged along the transverse bridge direction, a plurality of connecting rods 10 are welded between the two transverse beams, a plurality of anchoring steel strands 11 vertically penetrate through the transverse beams 9 of the operation platform in the side span side, the upper end of each anchoring steel strand 11 is anchored with the transverse beams, and the lower end of each anchoring steel strand is anchored with an arch bridge side span beam section 12 or a lower bearing platform.

In the concrete implementation of the utility model, in order to ensure the structural stability of the lifting frame during construction, a lower longitudinal beam 13 can be arranged at the lower Fang Shunqiao of the cantilever end of each upper longitudinal beam 7 facing the main span direction, a plurality of support rods 14 are welded between the lower longitudinal beam 13 and the upper longitudinal beam 7, the lower longitudinal beam 13 is welded with the upright post 2 of the tower after being welded, and a lifting end diagonal brace 15 is welded between the front end of the lower longitudinal beam 13 and the lower end of the upright post 2 of the tower; an anchor end diagonal brace 16 is welded between the cantilever end of each upper longitudinal beam 7 facing the side span direction and the tower upright 2.

As shown in fig. 4, the main span of the river-crossing bridge is designed as a lower-bearing steel box tie-bar steel arch bridge, the spans at two sides are cast-in-situ beams, the main span is constructed by adopting a first-arch-and-beam method during construction to ensure navigation, and the arch rib is installed by adopting an integral lifting method. According to a general construction method, it is necessary to install a lifting frame in water between two piers. This project is when being under construction, for the material consumption that reduces the hoisting frame to guarantee the overall structure stability of hoisting frame, install the hoisting frame at pier 1 top, the hoisting frame adopts both ends cantilever structure.

When the bridge pier 1 is constructed, embedded parts are arranged on two pier tops of a main span in advance, when a lifting frame is installed, the lower end of a column 2 of a tower frame is anchored with the embedded parts of the pier tops at each pier top, installation of the two tower frames and connection between the tower frames are completed, and then an upper longitudinal beam, an installation arch rib lifting device 8 and an operation platform are erected on the tower frames. The bridge can be constructed and completed in advance before the arch rib is lifted, so that the lifting frame is conveniently installed and operated on the pier top, and the lower ends of the anchoring steel strands 11 of the lifting frame facing the side span direction can be directly anchored with the side span beam sections 12 so as to reduce the lengths of the anchoring steel strands. And then the pre-assembled arch rib 17 is moved between the two bridge piers 1 of the main span, the arch rib is integrally lifted to the installation height through an arch rib lifting device 8 on the lifting frame and is fixedly connected with the arch abutment, in the lifting process, the lifting frame bears the gravity of the arch rib 17 towards the cantilever end of the main span, and the lifting frame is anchored between the cantilever end of the side span and the cast-in-situ beam through an anchoring steel strand, so that the stress balance at the two ends of the lifting frame can be ensured, and the integral stability is ensured.

Claims (2)

1. A anchor hoisting frame behind pier top big cantilever that is used for arched bridge arch rib to wholly promote, its characterized in that: the lifting frame is arranged at the top of the arch bridge pier and comprises two towers with rectangular cross sections, the two towers are respectively arranged at two sides of the pier top transverse bridge, each tower comprises 4 upright posts, the lower end of each upright post is anchored with a pier top embedded part, parallel connection and diagonal bracing are welded between the 4 upright posts of each tower, and a connecting truss is welded between the two tower frames in the transverse bridge direction; an upper longitudinal beam is fixedly erected between the upper ends of every two upright posts along the bridge, two ends of each upper longitudinal beam extend out of a cantilever in the midspan direction and the side span direction respectively, an arch rib lifting device is fixedly installed at the top of the cantilever end of each upper longitudinal beam on each tower in the midspan direction, an operation platform is erected between the tops of the cantilever ends of each upper longitudinal beam on the two towers in the side span direction and comprises two transverse beams arranged in the transverse bridge direction, a plurality of connecting rods are welded between the two transverse beams, a plurality of anchoring steel strands vertically penetrate through the transverse beams of the operation platform in the side span direction, the upper end of each anchoring steel strand is anchored with the transverse beams, and the lower end of each anchoring steel strand is anchored with the bridge span section or the lower bearing platform of the arch bridge side.

2. The pier top large cantilever rear anchor type lifting frame for integrally lifting arch bridge ribs according to claim 1, wherein: a lower Fang Shunqiao of the cantilever end of each upper longitudinal beam facing the main span direction is provided with a lower longitudinal beam, a plurality of support rods are welded between the lower longitudinal beam and the upper longitudinal beam, the lower longitudinal beam is welded with a column of the tower, and a lifting end diagonal brace is welded between the front end of the lower longitudinal beam and the lower end of the column of the tower; an anchoring end diagonal brace is welded between the cantilever end of each upper longitudinal beam facing the side span direction and the upright post of the tower.