CN106480816B - Case purlin combined type coast-floating stage - Google Patents

Abstract

The present invention discloses a plants case purlin combined type coast-floating stage, including multiple swim bridge section (1) and anchors (2) and anchor chain (3) for constraining the bridge section shifting of swimming continuously spliced, the bridge section (1) that swims includes buoyancy tank (11) and is symmetrically fixedly arranged on the truss (12,13) of the buoyancy tank (11) top both sides, further include strut (14), strut (14) both ends are fixedly connected with the truss of the buoyancy tank (1) top both sides (12,13) respectively.The case purlin combined type coast-floating stage of the present invention, resists vertical bending moment and antitorque ability is strong, effectively existence can be used under the conditions of middle wave.

Description

Box truss combined floating trestle

technical field

The invention belongs to the technical field of floating trestles, in particular to a box girder combined floating trestle with strong longitudinal bending moment and torsion resistance.

Background technique

The floating trestle is used for passing through shallow water on the shore. Floating trestles are usually assembled from factory-made floating tank units to form floating bridge sections, which are then further assembled and anchored. In order to reduce the assembly joints and reduce the cost, the floating bridge section can also be directly manufactured by the factory.

Floating structures such as pontoon bridges, floating trestles, and pontoon wharves originally composed of multi-purpose pontoon tanks can only survive in light waves (wave height 0.50-1.25m) and below conditions, and the application occasions and opportunities are greatly restricted.

The later offshore multi-purpose pontoon increased the height of the pontoon and the size of the joints of the pontoon, thereby improving the bending resistance of the floating bridge section, improving the ability to adapt to waves, and adapting to wave heights close to 2.0m. Theoretically speaking, if the height of the box body is further increased and the size of the joints is increased, it is possible to increase the survival wave height of the floating trestle. The box joint has been made of high-strength alloy steel and its size has been difficult to increase. In order to prevent damage in waves, it is necessary to dismantle the floating trestle to avoid waves at this stage. There is no mature product for medium waves with a wave height of 1.25-2.50m.

In order to be able to use and survive in a larger wave environment, the Chinese invention patent application "a self-elevating method for floating trestles" (application number: 2013104189200, publication date: 2015.3.25) and the Chinese invention patent application "a light, Elevated structure with self-floating function and human erection" (application number: 2014102604383, publication date: 2014.9.10) proposes a technical idea of erecting floating bridges first and then upgrading them to elevated trestles. However, after the floating trestle is upgraded to an elevated trestle, all the loads, including the self-weight of the trestle and the bridge deck load, are borne by the outriggers. The force requirements on the outriggers are high, resulting in a relatively limited carrying capacity of the elevated trestle, which cannot reach the floating trestle. Rely on the carrying capacity formed by buoyancy.

In a word, the problems existing in the prior art are: the floating trestle has weak ability to resist longitudinal bending moment and torsion, and it is difficult to survive and use under the condition of medium waves.

Contents of the invention

The object of the present invention is to provide a box-girder combined floating trestle, which has strong ability to resist longitudinal bending moment and torsion, and can effectively survive and use under the condition of medium waves.

The technical solution that realizes the object of the present invention is:

A box-girder combined floating trestle bridge, comprising a plurality of continuously spliced floating bridge sections and anchors and anchor chains for constraining the displacement of the floating bridge sections, the floating bridge sections include floating boxes and symmetrically fixed on the floating bridge sections The trusses on both sides of the upper part of the tank also include struts, and the two ends of the struts are respectively fixedly connected to the trusses on both sides of the upper part of the buoyancy tank.

Compared with the prior art, the present invention has the remarkable advantages of:

1. Strong ability to resist longitudinal bending moments: Add trusses to the pontoons, and the adjacent pontoon bridge joints are connected by pontoon joints and truss joints, which increases the vertical distance between the joints of the floating trestle bridges, thus without greatly increasing the bearing capacity of the joints Under the circumstances, the ability of the floating trestle to resist the longitudinal bending moment is greatly improved.

2. Good torsional rigidity: horizontal struts are arranged between the trusses on the floating tank, which not only improves the stability of the trusses, but also improves the torsional rigidity of the bridge section of the floating trestle bridge, thereby improving the resistance of the bridge section of the floating trestle bridge and the whole bridge. twist performance.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a top view of the box girder combined floating trestle of the present invention.

Fig. 2 is a front view of the box girder combined floating trestle of the present invention.

Fig. 3 is a cross-sectional view along line A-A of Fig. 2 .

In the figure: 1 floating bridge section, 11 pontoon, 12, 13 truss, 14 strut, 15 pontoon joint, 16 truss joint, 2 anchor, 3 anchor chain.

Detailed ways

As shown in Figures 1 and 2, a box-girder combined floating trestle in the present invention includes a plurality of continuously spliced floating bridge sections 1 and anchors 2 and anchor chains 3 for constraining the displacement of the floating bridge sections. The bridge section 1 includes a buoyancy tank 11 and trusses 12 and 13 symmetrically fixed on both sides of the upper part of the buoyant tank 11, and also includes a strut 14. The trusses 12, 13 are fixedly connected.

The connection between the two ends of the strut 14 and the trusses 12 and 13 can be fixed connection methods such as bolts, welding, and slots.

The pontoon 11 is an airtight structure, which can float on the water surface and mainly provides buoyancy for the floating trestle.

The trusses 12 and 13 are composed of several rods and can resist large longitudinal bending moments.

The buoyancy tank and the truss can be connected through a special connection joint, or welding can be used.

The struts 14 are components with a certain tensile and compressive capacity, which are used to enhance the stability of the trusses on both sides and improve the torsional performance of the entire bridge section.

Anchor 2 can be a weight or a driven pile, which is used to provide a reliable anchor point for the anchor chain and can resist certain horizontal and vertical forces.

The anchor chain 3 is a metal anchor chain or a composite material cable. One end is fixedly connected with the anchor 2, and the other end is fixedly connected with the floating bridge section 1.

As shown in FIG. 3 , preferably, there are at least two struts 14 on each floating bridge section 1 , and the at least two struts 14 cross each other, and the two struts 14 are fixedly connected at the crossing point.

As another preference, there are at least two struts 14 on each floating bridge section 1 , and the at least two struts 14 are parallel to each other.

The structural dimensions of the required trusses 12 and 13 need to meet the stress requirements. The specifications and quantity of the required anchor 2 can also be determined according to the force analysis. The quantity and size of the struts 14 can be determined according to the actual stress situation. At the same time, the struts 14 perpendicular to the truss may also be included, or all the struts 14 are perpendicular to the truss.

As a preferred solution, two ends of the buoyant tank 11 are respectively provided with a buoyant joint 15, and two ends of the trusses 12 and 13 are respectively provided with a truss joint 16, and the adjacent floating bridge sections 1 pass through the buoyant joint 15 and the truss joint. 16 detachable fixed connections.

The present invention increases the vertical distance between the upper and lower joints between the bridge sections by adding trusses on the upper part of the pontoon, and can greatly improve the ability of the pontoon trestle to resist longitudinal bending moments without increasing the connection force of the joints. The torsional performance of the joints enables the floating trestle to survive in the environment of moderate sea conditions, and expands the scope of application of the floating trestle.

Claims (3)

1. a plants case purlin combined type coast-floating stage, including multiple bridge sections (1) and for constraining described swim of swimming continuously spliced The anchor (2) and anchor chain (3) that bridge section is moved, it is characterised in that：

The bridge section (1) that swims includes buoyancy tank (11) and is symmetrically fixedly arranged on the truss (12,13) of the buoyancy tank (11) top both sides, Further include strut (14), strut (14) both ends are fixed with the truss of the buoyancy tank (11) top both sides (12,13) respectively to be connected It connects；

Buoyancy tank (11) both ends are respectively equipped with buoyancy tank connector (15), and truss (12,13) both ends are respectively equipped with Truss joint (16), Between the adjacent bridge section (1) that swims by buoyancy tank connector (15) with Truss joint (16) is removable is fixedly connected.

2. coast-floating stage according to claim 1, it is characterised in that：

The strut (14) that section swims on bridge section (1) described often is at least two, and at least two struts (14) intersect, and Two struts (14) are fixedly connected in crosspoint.

3. coast-floating stage according to claim 1, it is characterised in that：

The strut (14) that section swims on bridge section (1) described often is at least two, and at least two struts (14) are mutually parallel.