CN204940312U - A kind of integral lifting lowering system of steel cofferdam - Google Patents

Abstract

The utility model discloses an integral hoisting and lowering system for a steel cofferdam, which is characterized in that the overall hoisting and lowering system includes at least two support frames and lifting mechanisms installed at both ends of the top of the support frame, each of the support frames It includes two pile foundation steel casings, a high-connection column located on the pile foundation steel casing, and a Bailey beam horizontally erected on the top of the two high-connection columns. The utility model has the advantage that the overall lifting and lowering system is simple in composition, and the supporting frame for lifting is formed by connecting the steel casing of the pile foundation and erecting the Bailey beam to realize the lifting and lowering of the steel cofferdam on the spot. It eliminates the disadvantages of conventional shore-based overall assembly, launching, and overall floating in place, and can reduce project costs.

Description

An integral hoisting and lowering system for steel cofferdams

technical field

The utility model relates to the technical field of bridge engineering, in particular to an integral hoisting and lowering system of a steel cofferdam.

Background technique

With the rapid development of long-span bridges across the river, there are more and more large-scale deep-water foundation projects. For example, in the foundation construction of Chaoyang Bridge in Nanchang, new special equipment for the construction of the deep-water and shallow overburden foundation of the bridge (the shallowest part of the overburden is only about 1m) was adopted: large-tonnage (400t) single-double-wall combined steel cofferdam. The steel cofferdam adopts a circular arc at both ends + a rectangular structure in the middle, and is mainly composed of a cofferdam assembly frame system, a cofferdam lowering guide system, a cofferdam bottom section (with edge feet), a cofferdam top section, and a reinforced cofferdam purlin. A set of steel cofferdam is divided into 2 sections, 1 double-wall steel cofferdam bottom section and 1 single-wall steel cofferdam top section, the bottom section steel cofferdam is divided into 22 unit blocks, of which the arc part is divided into 12 blocks , the straight line part is divided into 10 pieces (the side plate and the vertical main beam of the straight line part are separately regarded as a block), and the top section is divided into 6 unit blocks.

For the hoisting of steel cofferdams, the traditional method is to manufacture the steel cofferdams as a whole in the factory, and then use large-scale floating cranes to place them in place and then sink as a whole. Large-scale floating cloud hoisting equipment is required, which requires construction space and water depth, and cannot be dismantled and repeated. use.

Contents of the invention

The purpose of this utility model is to provide an integral hoisting and lowering system for steel cofferdams according to the deficiencies of the above-mentioned prior art. The hoisting support frame realizes the hoisting and lowering of the steel cofferdam.

The utility model goal is realized by the following technical solutions:

An integral hoisting and lowering system for a steel cofferdam, characterized in that the overall hoisting and lowering system includes at least two supporting frames and lifting mechanisms installed at both ends of the top of the supporting frames, and each of the supporting frames includes two pile foundations The steel casing, the high-connecting columns on the steel casing of the pile foundation, and the Bailey beams horizontally erected on the top of the two high-connecting columns.

A pad beam is arranged between the top of the high-connecting column and the Bailey beam, and the pad beam is a double-assembled H-shaped steel arranged in the direction of the bridge.

The lifting mechanism includes a lowered distribution beam, a through-hole jack and a boom, the lowered distribution beam and the through-hole jack are arranged at both ends of the Bailey beam, and the boom is vertically connected to the through-hole jack lower end.

The utility model has the advantage that the overall lifting and lowering system is simple in composition, and the supporting frame for lifting is formed by connecting the steel casing of the pile foundation and erecting the Bailey beam to realize the lifting and lowering of the steel cofferdam on the spot. It eliminates the disadvantages of conventional shore-based overall assembly, launching, and overall floating in place, and can reduce the project cost.

Description of drawings

Fig. 1 is a schematic plan layout diagram of the overall hoisting and lowering system of the steel cofferdam of the utility model;

Fig. 2 is a schematic diagram of the elevation of the overall hoisting and lowering system of the steel cofferdam of the utility model.

detailed description

The features of the present utility model and other relevant features are further described in detail below in conjunction with the accompanying drawings through the embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1-2, the marks 1-11 in the figure are: steel cofferdam 1, lifting mechanism 2, pad beam 3, pile foundation steel casing 4, Bailey beam 5, guide frame 6, pad beam 7, height connection Upright column 8, through jack 9, drop distribution beam 10, boom 11.

Embodiment: As shown in Figures 1 and 2, this embodiment specifically relates to an overall lifting and lowering system for a steel cofferdam, which is used for lifting and lowering a steel cofferdam with circular arcs at both ends and a rectangular center in the middle, and the steel cofferdam It is assembled into a whole on the site pile foundation construction platform.

As shown in Figures 1 and 2, the overall lifting and lowering system in this embodiment consists of two support frames and a lifting mechanism arranged on the top of the support frames.

The support frame is "∏" type, including pile foundation steel casing 4, high-connected column 8 and Bailey beam 5, two pile-foundation steel casings 4 are selected for each support frame, and each pile is connected by high-connection column 8 The base steel casing 4 is extended to exceed 14m above the construction platform surface, and a small section of horizontal pad beam 3 is arranged on the top of the high column 8, and the pad beam 3 is specifically a pair of H-shaped steel; every two high column 8 tops A Bailey beam 5 is vertically placed on the pad beam 3 to connect the two high-connecting columns 8 into a whole. It should be noted that the Bailey beam 5 and the lifting points on the steel cofferdam are set at corresponding positions.

The lifting mechanism includes a lowering distribution beam 10, a through-hole jack 9 and a boom 11, wherein the lowering distribution beam 10 and the through-hole jack are symmetrically arranged at both ends of the Bailey beam 5, and the boom 11 is vertically arranged, and its upper end is connected to the through-hole Jack 9, the lower end is used to be connected with the steel cofferdam 1 that is to be hoisted and lowered.

In addition, the overall lifting and lowering system in this embodiment also includes a guide frame 6 arranged on the periphery of each pile foundation steel casing 4 for guiding and positioning the steel cofferdam 1 during the lowering process. The size of the guide frame 6 Slightly smaller than the size of the steel cofferdam 1, but the shapes of the two are corresponding, and the gap between the guide frame 6 and the steel cofferdam 1 is 5cm.

As shown in Figures 1 and 2, the installation method and working principle of the steel cofferdam integral hoisting and lowering system in this embodiment are as follows:

(1) Steel pipe piles are used as the pile foundation construction platform, and the overall assembly of the steel cofferdam 1 is completed on the construction platform. Among them, the steel cofferdam 1 is a double-wall steel casing cofferdam, and the length, width and height are respectively 34m, 21.4m, 13m, using a rectangular structure with circular arcs at both ends, weighing 400 tons, the distance between the double-walled cofferdam walls is 1.6m, and the height of the bottom edge is 3m;

(2) Utilize the pile foundation steel casing 4 at the four corners of the steel cofferdam 1 as the support of the reaction force frame, and after the construction of the four pile foundation steel casing 4 is completed, set guides around the pile foundation steel casing 4 frame 6; the four pile foundation steel casings 4 are extended to 14m above the construction platform surface through the high-connecting column 8, and then a section of 4m-long horizontal double-jointed H-shaped steel is set on the high-connecting column as the pad beam 3; the pad beam 3, a 21m long Bailey beam 5 is longitudinally arranged to connect the two pile foundation steel casings 4 into a whole; The position of the lifting point constitutes a correspondence;

Set hoisting mechanisms at the two ends of each Bailey beam 5, that is, install and lower the distribution beam 10 at the two ends of the Bailey beam 5, then install the finish-rolled rebar suspender rod 11 and connect it with the steel cofferdam 1, and then install Through-hole jack 9; it should be noted that, for the four lifting and lowering points, each lifting point is equipped with two φ50 fine-rolled rebar suspenders 11 and two 250t through-the-heart jacks 9, through the finish-rolled rebar suspender 11 and The distribution beam 10 is lowered, and the Bailey beam 5 is connected with the through jack 9;

(3) After the installation of the overall lifting and lowering system is completed, carry out trial lifting, start the through-hole jack 9, lift the steel cofferdam 1 as a whole by about 10cm, eliminate the connection gap and plastic deformation of each point, and check the working stability and structure of the system at the same time safety;

(4) After the test hoisting is completed, loosen the nuts on the upper boom 11 of the lowering distribution beam 10 to a certain height, retract the oil cylinder through the core jack 9, lower the steel cofferdam 1, and finally transfer the weight of the steel cofferdam 1 to the lowering through the nuts. distribution beam 10.

The overall hoisting and lowering system in this embodiment has a simple composition and a stable supporting structure. The supporting frame for hoisting is formed by connecting the steel casing of the pile foundation and erecting the Bailey beam to realize the hoisting and lowering of the steel cofferdam on the spot. In place, it overcomes the shortcomings of conventional shore-based overall assembly, launching, and overall floating in place, and can reduce project costs.

Claims (3)

1. the integral lifting lowering system of a steel cofferdam, it is characterized in that described integral lifting lowering system comprises at least twice bracing frame and is installed on the derricking gear at two ends, support frame as described above top, per pass support frame as described above comprise two pile base steel pile casting, be positioned on described pile foundation steel pile casting connect high column and level frame is located at the Bailey beam connecing high column top described in two.

2. the integral lifting lowering system of a kind of steel cofferdam according to claim 1, connects described in it is characterized in that between high column top and described Bailey beam and is furnished with bearing beam, and described bearing beam is the Two bors d's oeuveres H profile steel that direction across bridge is arranged.

3. the integral lifting lowering system of a kind of steel cofferdam according to claim 1, it is characterized in that described derricking gear comprises and transfer distribution beam, punching jack and suspension rod, describedly transfer distribution beam and described punching jack is arranged in described Bailey beam two ends, described suspension rod is vertically connected to described punching jack lower end.