CN1487151A - Archimedes bridge with protective enclosure - Google Patents

Abstract

The Archimedes bridge with protecting shell includes pipe body, its support structure, and outer casing, with some interval between the outer casing and the pipe body. The outer casing and the pipe body are connected via several elastic parts, and the outer casing may be shifted in certain range realtively to the pipe body. When there is some outer load, the dynamic outer load is first applied onto the outer casing, and then transmitted via the elastic parts to the pipe body. While transmitting load, the elastic parts remits dynamic load and absorbs partially. Especially, when some through holes are set on the casing and there is some relative motion between the casing and the pipe body, water will be extruded out via the through holes to produce ever obvious remission and absorption of the dynamic load. Thus, the load transmitted from the casing to the cable will be very weak and the pipe body and the cable are well protected.

Description

Archimedes bridge with protective enclosure

technical field

The invention relates to a tunnel suspended in water, namely the Archimedes bridge.

Background technique

Since the Archimedes Bridge was put forward in the 1880s, it has been accepted as a new traffic concept. Many countries in the world have invested heavily in research and have achieved a lot of scientific research results. Fantasy is gradually becoming reality. However, because the traffic concept of the Archimedes bridge involves a wide range of fields and there are many problems to be solved, a practical Archimedes bridge has not been built so far in the world. To build the Archimedes Bridge, we must first solve many engineering mechanics problems, among which how to weaken the effect of unsteady disturbance force on the bridge is one of the key issues. Past studies and related patents have designed the Archimedes bridge as a nearly rigid body composed of steel, cement, or a mixture of steel and cement as a whole or in several sections. The unsteady hydrodynamic force on such underwater components will directly It is transmitted to the fixed cable, so the stress condition of the cable is very bad, it is easy to be damaged, and then threatens the safety of the entire Archimedes Bridge.

Contents of the invention

For the existing problems of the proposed Archimedes bridge, the object of the present invention is to provide an Archimedes bridge with a protective shell, the protective shell of the bridge can effectively alleviate and absorb the dynamic load, thereby The safety of the bridge is guaranteed.

In order to realize the purpose of the present invention, the Archimedes bridge of the present invention comprises a pipe body and its supporting structure, and a shell is arranged outside the pipe body, and an appropriate gap is left between the inner surface of the shell and the outer surface of the pipe body, and the shell and the pipe body Through the flexible connection of several elastic parts, the shell can move within a certain range relative to the pipe body.

Further, the shell is a rigid shell made of metal or reinforced concrete, and the shape of its inner surface is adapted to the shape of the pipe body.

Further, several through holes are provided on the surface of the housing.

Further, the through holes on the surface of the shell are evenly distributed along its length and circumferential direction.

Further, the several elastic members flexibly connecting the shell and the pipe body are metal springs or rubber springs.

Further, the several elastic members flexibly connecting the shell and the tube body are air bags.

After the protective casing is installed outside the pipe body of the Archimedes Bridge, when there is a dynamic load, the dynamic external load is first loaded on the casing, and then the casing is transmitted to the pipe body through the elastic member. Relieve the dynamic load and partially absorb it, especially after setting the through hole on the shell, when the shell moves relative to the pipe body under the action of dynamic load, the water between the shell and the pipe body will be squeezed from the through hole on the shell At this time, the relief and absorption of the dynamic load by the shell will be more significant, so that the load finally transmitted to the cable through the pipe body will become very weak, so that the pipe body and its cables can be effectively protected.

Description of drawings

Fig. 1 is the cross-sectional structure schematic diagram of Archimedes Bridge of the present invention;

Fig. 2 is the left view of Fig. 1 structure;

Fig. 3 is an enlarged schematic diagram of part A in Fig. 1;

Fig. 4 is the second kind of elastic member embodiment;

Fig. 5 is the embodiment of the third kind of elastic member.

Detailed ways

Figures 1 and 2 show the cable-supported Archimedes Bridge. The bridge is mainly composed of a shell 1, a pipe body 2, a cable 4 and an elastic member 7. The cable 4 anchors the pipe body 2 to the underwater base 5. , the shell 1 is made of metal, and is sleeved on the outside of the pipe body 2, and the shell 1 and the pipe body 2 are flexibly connected and supported by the elastic member 7. The cable 4 passes through the through hole provided on the shell 1, and the shell 1 is also provided with a through hole 3 through which the water 6 enters and exits, and several through holes 3 are distributed along the length and the circumferential direction of the shell 1.

In Embodiment 1 shown in FIG. 3 , the elastic member 7 is an airbag, and several airbags are arranged between the shell 1 and the tube body 2. Under static conditions, the airbags 7 keep the shell 1 and the tube body 2 in their initial equilibrium state.

In Embodiment 2 shown in FIG. 4 , the elastic member 7 is a rubber spring. In Embodiment 3 shown in FIG. 5 , the elastic member 7 is a metal spring. The effects of the two springs in Embodiment 2 and Embodiment 3 are the same as those of the airbag in Embodiment 1.

When waves or eddies appear around the shell 1 in the water 6, the dynamic load generated by the water is first applied to the shell 1, and under the action of the external force, the shell 1 moves along the direction of the external force. After the shell 1 moves relative to the tube body 2, the shell 1 compresses the water between it and the tube body 2, and the compressed water is discharged from the through hole 3 on the corresponding side of the shell 1, while the external water on the other side is discharged from the through hole. 3 is sucked into the enlarged gap between the shell 1 and the tube body 2. When the shell 1 presses the water in the gap, the elastic member 7 on the same side is compressed simultaneously, while the elastic member on the opposite side is stretched. Along with the discharge and suction of water and the compression and pull of the elastic member, part of the force received on the shell 1 is transmitted to the pipe body 2 . Due to the process of force transmission between the shell 1 and the tube body 2, accompanied by the row-suck of water and the press-pull of the elastic member, the water plays a very good damping role here, absorbing and relieving Most of the dynamic load energy, coupled with the damping effect of the elastic member, makes the force transmitted to the pipe body 2 very small, and the force acting on the cable 4 through the pipe body 2 is even smaller, which is not enough The cables are destroyed, so that the safety of the entire bridge body is guaranteed.

By increasing the number of elastic members 7, the shell 1 may not be provided with through holes, and the same effect can still be achieved at this time.

By adjusting the diameter of the through hole 3 on the shell 1 and the distribution density of each part, the direction of the water flow and its flow can be adjusted in a targeted manner, so as to control and adjust the damping efficiency of the shell 1 to the dynamic load and the flow of the shell 1 to the pipe body 2. The purpose of transmitting the direction of force.

Claims (6)

1. A kind of Archimedes bridge with protective shell, comprises pipe body and support structure thereof, it is characterized in that, described pipe body is provided with a shell outside, leaves suitable gap between the inner surface of this shell and the pipe body outer surface , the shell and the pipe body are flexibly connected through several elastic pieces, and the shell can move within a certain range relative to the pipe body. 2. The Archimedes bridge with protective shell as claimed in claim 1, characterized in that, the shell is a rigid shell made of metal or reinforced concrete, the shape of its inner surface is the same as that of the tube Adapt to the shape of the body. 3. The Archimedes bridge with protective shell as claimed in claim 2, characterized in that, the surface of the shell is also provided with several through holes. 4. The Archimedes bridge with protective shell as claimed in claim 3, characterized in that, the through holes on the surface of the shell are uniformly distributed along its length and circumferential direction. 5. The Archimedes bridge with a protective shell as claimed in any one of claims 1, 2, 3, 4, characterized in that, the plurality of elastic members that flexibly connect the shell to the pipe body are metal springs or rubber springs. 6. The Archimedes bridge with a protective shell as claimed in any one of claims 1, 2, 3, 4, characterized in that the plurality of elastic members that flexibly connect the shell with the pipe body are airbags.

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