CN201952799U

CN201952799U - Fiber reinforced composite deepwater composite pile

Info

Publication number: CN201952799U
Application number: CN2010205297153U
Authority: CN
Inventors: 戴国亮; 龚维明; 周香琴
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2010-09-14
Filing date: 2010-09-14
Publication date: 2011-08-31
Anticipated expiration: 2020-09-14

Abstract

The utility model discloses a fiber reinforced composite deepwater bridge composite pile, comprising a concrete pile body with a built-in reinforcing cage, a steel pipe sleeves the concrete pile body, and an FRP (Fiber Reinforced Polymer) pipe sleeves the external part of the steel pipe. Compared with the prior art, The fiber reinforced composite deepwater composite pile is advantageous in that: a deepwater bridge pile foundation construction method is a construction method aiming at traditional reinforced concrete pile foundation in a large-scale deepwater bridge, problems of seawater erosion, difficult solidification of concrete to reach predetermined strength, etc. probably occur during pile sinking process, the deepwater bridge pile foundation construction method is a construction method applying FRP pipe composite pile foundation. An FRP pipe composite pile is a foundation form used for deepwater bridges, and is characterized in that, common reinforced concrete or steel pipe concrete piles work as a prototype, an FRP pipe is added at the external of the pile, and an effective adhesive is used to from an integration, and a foundation structure advantaged by good corrosion resistance is formed.

Description

Fiber-reinforced composite deep water bridge composite pile

Technical field

The utility model relates to a kind of bridge foundation technology, relates in particular to a kind of fiber-reinforced composite deep water bridge composite pile.

Background technology

At present; very serious problem has appearred in bridge and infrastructure industry in corrosive environment; traditional reinforced concrete pile or timber can reach designing requirement in the home condition service life; but moist or have in the littoral environment of storm tidal action and can quicken the corrosion of reinforcing bar, concrete is degenerated.Along with the development of national economic development, need build large bridge in many deep water, thereby produce the problem of corrosive properly.The basic pattern of these bridges adopts the overlength large diameter bored pile more.In conventional design, casing only plays protection pile body effect, generally be do not consider to participate in stressed, the pile cutoff that casing will be arranged as with the same design of steel concrete pile cutoff of bottom.

Deep water bridge pile foundation job practices adopts the fiber-reinforced composite stake, and promptly FRP pipe composite pile uses novel method to construct, and the FRP composite pile plays the effect of casing in the process of pile sinking.In the pile foundation use, FRP manages the decay resistance of existing excellence, protects inner pile body, can retrain inner pile body again, improves the load-carrying properties of concrete pile body.

FRP pipe composite pile basis is with respect to the conventional piles basis, and it not only can bear vertical load, can also bear horizontal loading, and the better load-carrying properties of maintenance that can be permanent have superior mechanical characteristic and economic performance.After the length of FRP pillar surpassed the river erosion line, in fact pile body had formed the variable cross-section major diameter composite pile of " up big and down small ": promptly top be similar to FRP or FRP steel tube concrete pile, the bottom is the mixing pile body of reinforced concrete pile; In addition, in the casing scope, because the hoop effect of casing, this section pile body will present the bearer properties of steel pipe-concrete combined structure, and its vertical and Its ultimate bearing capacity all is significantly improved.

Have the example that the FRP sheet pile is used for actual engineering both at home and abroad, but FRP pipe composite pile basis is not applied also.

The utility model content

The utility model provides a kind of fiber-reinforced composite deep water bridge composite pile, and the utility model can improve bearing capacity and corrosion-resistant.

The utility model adopts following technical scheme:

A kind of fiber-reinforced composite deep water bridge composite pile comprises the concrete pile body of built-in reinforcing cage, at the outside sheathed steel pipe of concrete pile body, at the outside sheathed FRP pipe of steel pipe.

Compared with prior art, the utlity model has following advantage:

Deep water bridge pile foundation job practices, be at the job practices of conventional steel reinforced concrete pile foundation in the large-sized deep water bridge, in pile driving process, may run into sea water intrusion, concrete is difficult to solidify predetermined strength or the like problem that reaches, use the job practices that fiber reinforced plastic FRP (Fiber Reinforced Polymer abbreviates FRP as) pipe mixes pile foundation.FRP pipe composite pile is a kind of base form that is used for the deep water bridge, it is a prototype with ordinary reinforced concrete or steel tube concrete pile, set up the FRP pipe in the stake outside, utilize effective cementing agent to make it become integral body, form decay resistance good basis form of structure.Its section form as shown in Figure 1.After surpassing the river erosion line, the cross section as shown in Figure 2.

1, the utility model has been used a kind of fibre reinforced composite tubes, i.e. the FRP outer tube.

Fibre reinforced composite tubes, the FRP pipe can in use play the inner pile body of anti-corrosion protection again, and can retrain inner concrete filled steel tube pile body as the boring casing in work progress, improves pile bearing capacity.

2, the FRP pipe has excellent corrosion resisting performance, guarantees that composite pile reaches designing requirement application life in deep water foundation.

Traditional ordinary reinforced concrete stake can reach designing requirement in the home condition following service life, but steel concrete can corrosion under some severe environmental conditions.In the concrete structure there be the main cause of corrosion of steel bar:

(1) cross thin because of concrete cover or density relatively poor, carbon dioxide in air is infiltrated topping, makes the topping carbonization, corrosion of steel bar, concrete spalling.

(2) chloride ion corrosion.When having added Admixture owing in the construction reason concrete, or winter for preventing concrete-bridge, salting icy on road etc., all can cause chlorion and reinforcing bar and concrete that complicated electrochemical reaction takes place, thereby cause corrosion of steel bar, concrete is along muscle spalling, structural failure.

(3) concrete structure is in aggressivity and exposed environments, causes reinforcing bar to shift to an earlier date corrosion.

The large-sized deep water bridge foundation is in the briny environment, exists a large amount of chlorions in the seawater.For reason given above, there is the problem of very important durability in the corrosion of our deducibilitys pile foundation meeting invar reinforced concrete wherein.

The FRP material has unique character and shows one's talent in constructional materials: (1) high-strength light, be applied in large span, the heavy in section structure, and convenient construction more alleviates deadweight, reduces difficulty of construction; (2) tensile strength height, the tensile strength of FRP muscle are considerably beyond reinforcing bar, and be similar with high tensile steel wire; (3) coefficient of thermal expansion and concrete are approaching, have guaranteed the energy collaborative work under the different temperatures environment of FRP material and concrete; (4) excellent corrosion resisting performance is arranged, in the environment of acid, alkali, villaumite and humidity.Can use for a long time, significant meaning be arranged for the deep water bridge foundation.

According to the interrelated data introduction, the loss that the U.S.'s annual invar material corrosion causes is up to 70,000,000,000 dollars.According to U.S. relevant department statistics, the most of invar muscle corrosion of the bridge of building the 1950's before and destroying seriously.In nearly 600,000 bridge blocks of the U.S., there are nearly 100,000 corrosion of steel bar serious at present.Britain is built in the reinforced concrete structure in the environment of ocean and chloride medium, and accounting for more than 1/3 of reinforcing bar need be rebuild or change to the corrosion of invar muscle.In Japan,, make corrosion of steel bar become a serious problem because more area adopts sea sand as the fines in the concrete.Investigation to Okinawa area 177 bridge blocks and 672 houses shows that the spoilage of bridge deck and concrete beam reaches more than 90%, and the spoilage of schoolhouse one class civilian construction is also more than 40%.China shows the investigation to 18 the steel concrete harbours in south China in 1981, although there was the serious corrosion of reinforcing bar of 16 harbours only 7～15 years operating period.Investigation to 22 middle-size and small-size marine structures in Zhenghai, Zhejiang in 1984 shows, in 967 members since corrosion of steel bar cause along the muscle cracking destruction have 538, account for 56% of member sum.And enter after 21 century, the etching problem of steel is more serious.

The example that the FRP material is used for actual engineering has been arranged both at home and abroad, as has been positioned at Bay Ridge, Brooklyn, the harbour of New York, and with the FRP sheet pile wall as water-stop curtain or the like.

3, stake cross section supporting capacity improves

FRP pipe composite pile normal section bearing capacity is formed by three partial stacks, is respectively the FRP pipe, the bearing capacity of steel pipe and reinforcing steel bar concrete core three parts.Bearing capacity calculation is carried out in stake for circular cross-section, and the basic assumption of employing is identical with the square-section member, and method for simplifying is also similar with the square-section member.But, therefore its difference is arranged also on computational methods because the vertical muscle steel bar stress of composite pile circular cross-section is evenly to arrange along cross-sectional perimeter.

The supporting capacity situation of composite pile under vertical and horizontal loads then needs further to derive.According to theory analysis, we as can be known, the normal section supporting capacity of concrete filled steel tube has been avoided the characteristics of the easy flexing of reinforcing bar owing to combine reinforcing bar and concrete advantage, retrain concrete its intensity is improved, thereby made the bearing capacity in whole cross section be enhanced.Analogize, at the steel pipe paste outside its supporting capacity of composite pile of FRP material must increase.

Description of drawings

Fig. 1 is the structural representation of the utility model composite pile, and wherein, Fig. 1 a is the longitudinal sectional view of composite pile, and Fig. 1 b is the A-A sectional view of composite pile.

Fig. 2 is the composite pile schematic diagram after weathering, and wherein, Fig. 2 a is the longitudinal sectional view of the composite pile after weathering, and Fig. 2 b is the B-B sectional view of the composite pile after weathering, and Fig. 2 c is the C-C sectional view of the composite pile after weathering.

Among the figure, 1FRP pipe, 2 steel pipes, 3 reinforcing cages, 4 concrete.

The specific embodiment

A kind of fiber-reinforced composite deep water bridge composite pile comprises the concrete pile body 4 of built-in reinforcing cage 3, at the outside sheathed steel pipe 2 of concrete pile body 4, at the outside sheathed FRP pipe 1 of steel pipe 2.

Claims

1. fiber-reinforced composite deep water bridge composite pile comprises it is characterized in that the concrete pile body (4) of built-in reinforcing cage (3), at the outside sheathed steel pipe (2) of concrete pile body (4), at the outside sheathed FRP pipe (1) of steel pipe (2).