CN1110350A

CN1110350A - Bridging method using leverage principle

Info

Publication number: CN1110350A
Application number: CN 95100884
Authority: CN
Inventors: 刘宗珩
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-02-28
Filing date: 1995-02-28
Publication date: 1995-10-18
Anticipated expiration: 2015-02-28
Also published as: CN1065579C

Abstract

The present invention provides a leverage bridging method. It uses a member system formed from prefabricated steel members according to triangular form as bridge. This member system is used as a "lever", and its two ends are equilibriously placed on the "fulcrums" by banks, and then the leverage of one end of "arm of force" is used to make another end used as "loading arm" stride overhead across the river to the opposite bank. This method is used for bridging, it has no need of building scaffolding, also has no need of building bridge piers regardless of span extent, and can build bridge also regardless of bridge location circumstances, and can greatly shorten the bridging period, and can greatly economize investment.

Description

Bridging method using leverage principle

The present invention relates to a kind of structure and erection method of bridge, especially a kind of bridging method using leverage principle.

Past, build bridge and all will carry out the design of specific pattern, survey the ground condition of bridge location, essential built will be built bridge pier during construction; The span of bridge is big more, and it is many that bridge pier is wanted more.Particularly, more need special designing technique, the firm especially column in basis be arranged, use the member of the steel of high-quality as suspension bridge as the sort of cable stayed bridge of Shanghai Yang Pu bridge; The time of bridge construction is also very long.So, build a bridge in the past, engineering is very big, and is time-consuming, influenced the speed of bridge construction.

The object of the present invention is to provide and a kind ofly need not carry out the design of specific pattern and method, bridge just can not soar aloft to be cross over the opposite bank with built during construction, no matter span is much also need not build bridge pier, no matter new bridge construction and bridge constructing method that the ground condition of bridge location how also can bridge construction.

Below in conjunction with accompanying drawing the present invention is elaborated.

Fig. 1 is an end of the bridge basic schematic of the present invention;

Fig. 2 is a prefabricated units schematic diagram of the present invention;

Fig. 3 is a preliminary assembling schematic diagram of the present invention;

Fig. 4 is a unsettled assembling schematic diagram of the present invention;

Fig. 5 is a lever balance schematic diagram of the present invention;

Fig. 6 is the strong stability schematic diagram that adds of the present invention;

Fig. 7 is a bridge skeleton schematic diagram of the present invention;

Fig. 8 holds the bridge schematic diagram for skeleton of the present invention;

Fig. 9 is an independent arch bridge schematic diagram of the present invention.

The object of the present invention is achieved like this: at first, and in the two sides of selected bridge location, at bank Steel bar concrete water end of the bridge basis is used on the limit. This basis need only be watered into the platform that equates with the width of bridge floor and get final product, and its Main Function only is the weight of bearing bridge, and needn't prevent the firmness that inclines. (such as Fig. 1)

In addition, prefabricated components are to adopt the prefabricated rod member of steel. The kind of member: be divided into " quarter butt (a) ", " crossbar (b) ", " stock (c) ", other adds a kind of " assembled disc (d) ". (such as Fig. 2) this member, its length dimension is far longer than lateral dimension, is called " rod member " in statics. By the system that constraint forms, be called " system of bars " by several rod members. Rod member just has certain stability according to the system of bars of the pattern composition of triangle. Do bridge with this system of bars with stability, in certain span, just can bear certain pressure.

The assembling of system of bars is to begin to carry out on the platform on end of the bridge basis.If the depth design of platform is 20 meters, then can on platform, assemble the system of bars of four joints.This assembly working can begin to carry out on the platform of two sides simultaneously.(as Fig. 3).The assembling system of bars should " two-wire " carry out shoulder to shoulder.Between two-wire, get final product according to existing engineering surfacing.The limit assembling, the limit surfacing, this just is beneficial to next step assembly working.

Respectively be assembled on the platform of two sides after four joints, next step assembling must help with crane, carries out " unsettled assembling ".Unsettled assembling follows these steps to carry out.(as Fig. 4)

The first step: at A dish assembling b-1 bar.

Second step:, then, b-1 and the amalgamation of b-2 bar, use bolton at the C point at B dish assembling b-2 bar.

The 3rd step: with C dish assembling b-1 and C-1 bar.

The 4th step: at A dish assembling C-2 bar, then, D is coiled and the assembling of C-2 bar with two pairs of bolts, and b-2 bar and the assembling of D dish.

The 5th step: a-1 bar and the assembling of D dish.

The 6th step: a-1 bar and the assembling of C dish.

The 7th step: b-3 bar and the assembling of D dish.

The 8th step: the assembling of b-4 bar and C dish, then, at the E point b-3 and b-4 bar and close, use bolton.

The 9th step: with F dish and C-2 and the assembling of b-4 bar.

The tenth step: with a-2 bar and the assembling of F dish.

The 11 step: with G dish and a-2 and the assembling of b-3 bar.

The 12 step: with a-3 bar and C and the assembling of G dish.

Through the assembling in these 12 steps, just finished the unsettled assembling of two joints of system of bars, then, according to same step, two sides unsettled assembling is simultaneously promptly relatively assembled to the direction of development of centre, korneforos and shoreward.The assembling of system of bars just is that branch carries out to two ends, makes two ends remain balance.That is be: the stem member system makes lever two ends maintenance balance and places as on the platform of " fulcrum " (as Fig. 5) as one " lever ".Like this, how long the system of bars of two sides is relatively to unsettled the stretching out in centre, korneforos, and how long just the direction of shoreward is same on the contrary stretches.Like this, Drawing upon is " leverage " of an end of conduct " arm of force " on the bank, by " fulcrum ", the end as " weighing arm " (or claim " power assistant arm ") is stretched out high up in the airly, think the mythology on fabulous " opposite bank of soaring aloft to stride across " to be implemented at present by many people.

For keeping the stable of system of bars, must constantly carry out force analysis according to the formula of stipulating in the statics, prevent the destruction that is under pressure.System of bars is under pressure and often occurs with top generation fracture or the following form that bends when destroying, and therefore, must select the steel and the suitable cross-sectional area of design of high-quality for use, with the stability of maintenance system of bars.But when span reached capacity, this stability also can't keep.Therefore, at the critical position that stability is damaged, must strengthen.The method of strengthening: on the first floor system of bars, the system of bars of the assembling second layer is to prevent fracture or crooked.Along with the continuous increase of span, more can assemble three layers, four layers system of bars, (as Fig. 6) down to multilayer.Until the unsettled system of bars that stretches out in two sides till korneforos centre closes up.Like this, the system of bars of multilayer just can form one makes a concerted effort, and foot can keep the stable of bridge.The prefabricated units of this assembling system of bars, no matter large or small bridge all is suitable for.The bridge dismounting can be retrofitted on the foot bridge, and the foot bridge dismounting can be assembled into bridge.Assembling adopts bolt in addition fastening, so, can promptly be assembled into a bridge.

Adopt this " bridging method using leverage principle " to build bridge, bridge construction department carries out the bridge design of different spans, different in width, different loads as required, and system of bars is carried out force analysis at any time, keeps stability to get final product.The deal of this design work, than existing bridge just simplify and Duoed.Employing the present invention builds bridge, has saved the hard work of surveying bridge location ground condition, has saved the giant-scale engineering of building bridge pier with heavy railway carriage or compartment, has saved the transitionality work of the trouble of the built of constructing, nail pallet.Owing to, just can not leave behind full ground residue wood fragments on the building site without built, without the bridging pier.Therefore, input technology, goods and materials, time, fund, personnel ... each side, than existing bridge just save and Duoed.

By the unsettled system of bars that stretches out in two sides, after the centre, korneforos closes up, just by the synthetic system of bars of two system of bars; Unsettled end of stretching out, two sides is just become the state of " support mutually " by " vacant state "; At this moment, the weak link in the centre, korneforos can all be strengthened the system of bars for multilayer, thereby the stress of system of bars just changes to some extent, and stress point is shared with regard to effluent central authorities on the platform of two sides, has finally constituted stable bridge skeleton, (as Fig. 7).The bridge skeleton is a two-wire, across just can surfacing between the two-wire.The road surface is layered on minimum one deck of system of bars, and vehicle and pedestrian can flatly pass a bridge, and avoids climbing.If need under the bridge by tall and big steamer, the body of a bridge will raise.The rising body of a bridge has two kinds of methods available: the one, earlier the platform on end of the bridge basis is raise, and the body of a bridge just can be along with rising.The one, at the bridge middle part member of lower floor is split out a door, enable to reach the height that needs by big ship.

Before the bridge middle part is the dismounting of the member of lower floor, to increase the number of plies of system of bars earlier on the upper strata, this dismounting and increase all must just can be carried out through after the force analysis, prevent that stability from being weakened.Split out under the bridge after the door, the road surface will be raised to door above, thereby will ascents and descents, but in easy flights, (as Fig. 8), the thick black line among the figure is exactly the road surface.

Bridging method using leverage principle of the present invention has two kinds of bridge construction patterns, and Fig. 8 is first kind of pattern, and its characteristics are; 1, " the prefabricated rod member " of bridge construction becomes bridge " permanent skeleton "; 2, the bridge floor road is to rely on the skeleton load.Second kind of form is: 1, the prefabricated rod member of bridge construction does not become " permanent skeleton ", and only as " the scaffold frame " of building, i.e. dismounting was transported after bridge built up, the instrument of a kind of permanent use during as other bridge construction beam; 2, bridge becomes a kind of independent arch bridge, does not rely on the skeleton load.

Second kind of bridge constructing method is as follows: the system of bars that stretches out in two sides is after the centre, korneforos closes up, and after the weak link of centre, korneforos is strengthened to the system of bars of multilayer, can rest provisionally and piece together pallet on the skeleton, become an arch bridge with steel bar concrete water, the stem member system all dismantles and transports then, allow arch bridge independently as rainbow across on two sides, (as Fig. 9).Across surfacing between the two-wire, and build and block bar, installation bridge lamp ..., certainly also having a lot of work, but all belong to the category of existing engineering, work of the present invention is required till this.

The present invention has following advantage: need not carry out the design of specific pattern before the bridge construction, need not survey the ground condition of bridge location, need not build and prevent the firm column of toppling over, without built, no matter span is much also need not be built bridge pier during construction; Can accelerate bridge construction greatly, on the quantity of investment, also will save greatly.

Claims

1, a kind of bridging method using leverage principle, adopt the prefabricated rod member of steel, it is characterized in that: rod member is pressed the pattern of triangle and is formed system of bars, platform with the end of the bridge basis begins to assemble to two ends as fulcrum, make two ends remain balance, when the length extending of lever system when being stressed the critical position of destroying, must two layers, three layers of assemblings so that the thick stick spare system of multilayer to add strong stability, when two sides relatively after the unsettled thick stick spare system closure of stretching out in korneforos centre, all strengthen being the thick stick spare system of multilayer in the weak link of centre, korneforos.

2, bridging method using leverage principle as claimed in claim 1 is characterized in that the two sides of selected bridge location, on the bank with the platform that steel bar concrete water becomes and bridge deck width is equal.

3, bridging method using leverage principle as claimed in claim 1 is characterized in that having the prefabricated rod member of two kinds of bridge construction pattern: a, bridge construction to become the permanent skeleton of bridge, and the bridge floor road relies on the skeleton load; The prefabricated rod member of b, bridge construction is only as " scaffold frame ", can remove after becoming arch bridge with steel bar concrete water thereon.