CN103898831B - A kind of precast splice type arch rib of ultra-high performance concrete and fabrication and installation method thereof - Google Patents

A kind of precast splice type arch rib of ultra-high performance concrete and fabrication and installation method thereof Download PDF

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Publication number
CN103898831B
CN103898831B CN201410139716.XA CN201410139716A CN103898831B CN 103898831 B CN103898831 B CN 103898831B CN 201410139716 A CN201410139716 A CN 201410139716A CN 103898831 B CN103898831 B CN 103898831B
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China
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arch rib
prefabricated components
arch
preformed hole
ash
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CN201410139716.XA
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Chinese (zh)
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CN103898831A (en
Inventor
蒋田勇
田仲初
陈福焕
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长沙理工大学
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Abstract

The invention discloses a kind of ultra-high performance concrete arch rib and prefabricated components preparation method thereof, adopt ultra-high performance concrete to make arch rib prefabricated components, and arch rib prefabricated components are spliced into arch rib. Arch ring is made up of two separate type arch ribs, connects and adopts single-order type to glued joint seam, and offer multiple preformed holes in arch rib prefabricated components one end between arch rib prefabricated components, and the other end is fixed with the connecting rod that multiple sizes are mated with described preformed hole size; Before lifting, arch rib prefabricated components interface, preformed hole and connecting rod are all smeared enough epoxy resin; When lifting, in two adjacent arch rib prefabricated components, the connecting rod of one of them arch rib prefabricated components one end inserts in the preformed hole of another arch rib prefabricated components one end. Method of the present invention can ensure rapid assembled arch rib in the short period of time, guarantees the construction quality of arch rib and the durability of full-bridge.

Description

A kind of precast splice type arch rib of ultra-high performance concrete and fabrication and installation method thereof
Technical field
The present invention relates to precast splice type arch rib and making and the installation method of the technical field of structural engineering in wood engineering industry, particularly a kind of ultra-high performance concrete.
Background technology
Pin-connected panel ribbed arch bridge compared with cast in situs construction technology, have can scale prefabricated, transport and easy for installation, the construction period is short, also less, and construction quality is easy to ensure average labor power consumption, all the more so for strong concrete. For the arch bridge across on reservoir, river level is for a long time in high water level, river control water inconvenience, can not block for a long time river, and the cast in situs construction period is long, adopt in this case cast in situs to construct wayward for the duration, and more cannot ensure for construction quality.
High performance concrete especially ultra-high performance concrete is a kind of novel concrete based composites with superhigh intensity, high tenacity, high-durability, high-environmental. Usually, ultra-high performance concrete, also referred to as RPC ReactivePowderConcrete (RPC), uses RPC can reduce scantling in structure, effectively alleviates structure and bridge pier deadweight, saves material usage. Research is found: the porosity that RPC is ultralow and fine and close structure have not only improved its intensity and toughness greatly, also can improve its impermeabilisation ability simultaneously, thereby effectively stop the erosion of surrounding medium, improve its durability, make it have excellent frost resistance, carbonization resistance, resistance of chloride ion penetration, resistance to water, the corrosive power of resistance to bittern, stronger anti-frozen-thawed ability, good anti-wear performance etc. This corrosion resistance for long-term ribbed arch arch springing below the water surface is highly beneficial.
Also do not use at present the method for ultra-high performance concrete create put together to pack formula ribbed arch bridge.
Summary of the invention
Technical problem to be solved by this invention is, for prior art deficiency, a kind of precast splice type arch rib and making and installation method of ultra-high performance concrete are provided, rapid precast assembly arch rib in the short period of time, and guarantee the construction quality of arch rib and the durability of full-bridge.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of arch rib, this arch rib is connected in sequence by multistage arch rib prefabricated components, described arch rib prefabricated components are made up of reinforcing bar and ultra-high performance concrete material, described arch rib prefabricated components one end offers multiple preformed holes, and the described arch rib prefabricated components other end is fixed with multiple sizes and mates connecting rod with described preformed hole size; In two adjacent arch rib prefabricated components, the connecting rod of one of them arch rib prefabricated components one end inserts in the preformed hole of another arch rib prefabricated components one end; Described ultra-high performance concrete is formulated by cement, silicon ash, fine-ground fly-ash, quartz sand, high efficiency water reducing agent, water and steel fibre, glue mass ratio gets 0.16~0.22, sand-lime mass ratio gets 0.8~2.0, cement: silicon ash: fine-ground fly-ash: quartz sand: high efficiency water reducing agent: water: the mass ratio of steel fibre is=1:0.25:0.25:1.2:0.04:0.3:0.02.
Described arch rib prefabricated components two ends are equipped with connection step.
The present invention also provides a kind of arch rib prefabricated components preparation method, it is characterized in that, the method is:
1) earth's surface is flattened, fill out the thick grit bed course of 20cm on upper berth, earth's surface, on Base with Sand Gravel Cushion, evenly lay chock and keep described chock upper surface level, multiple mould bases are set on chock, described mould bases comprises bed die and side form, described bed die is fixed on chock, described bed die length, width, shape all with arch rib length, width, form fit; Two of described bed die compared with the side form that is all fixed with vertical setting on long side; The good reinforcing bar of colligation is fixed in mould bases, built-in fitting is installed at mould bases two ends, wherein the built-in fitting of one end is provided with preformed hole, is fixed with in addition the connecting rod mating with described preformed hole size on the built-in fitting of one end;
2) cement, silica flour, fine-ground fly-ash, quartz sand are poured in mixer, dry mixing, adds water afterwards, stir, add high efficiency water reducing agent, continue to stir, finally add steel fibre, stir again, then mixture is poured in mould bases, through dither vibration compacting aftershaping, obtained multiple arch rib prefabricated components, described multiple arch rib prefabricated components are put into water tank, under 80~100 DEG C of hot water environments, leave standstill maintenance 4 days; Wherein, glue mass ratio gets 0.16~0.22, and sand-lime mass ratio gets 0.8~2.0, cement: silicon ash: fine-ground fly-ash: quartz sand: high efficiency water reducing agent: water: the mass ratio of steel fibre is 1:0.25:0.25:1.2:0.04:0.3:0.02.
In the present invention, cement adopts 525#Portland cement; Silicon ash is selected the canescence fines silica flour of grading limit at 0.1~1mm; Fine-ground fly-ash average grain diameter is 5.8 μ m; Quartz sand average grain diameter is 250 μ m, and particle size range is between 150~600 μ m; The high efficiency water reducing agent that high efficiency water reducing agent uses water-reducing rate to be greater than 30%; Steel fibre diameter is that 0.2mm, length are 12mm.
Compared with prior art, the beneficial effect that the present invention has is: the present invention adopts ultra-high performance concrete to make arch rib, has greatly improved the corrosion resistance of long-term ribbed arch arch springing below the water surface; Adopt ultra-high performance concrete to reduce the deadweight of arch bridge superstructure, the horizontal thrust that superstructure produces also diminishes, also corresponding the reducing of substructure quantities such as the bridge pier arranging for offset by the level of thrust, thus reduce due to the construction costs that adopts ultra-high performance concrete to increase. And the assembled ribbed arch bridge superstructure of the inventive method is lighter owing to adopting, so plant bridge type to the requirement of geological conditions also corresponding reduction, expand the scope of application of arch bridge; Method of the present invention can ensure rapid assembled arch rib in the short period of time, guarantees the construction quality of arch rib and the durability of full-bridge.
Brief description of the drawings
Fig. 1 is one embodiment of the invention arch rib scheme of installation;
Fig. 2 is one embodiment of the invention arch rib prefabricated components mould bases schematic diagram;
Fig. 3 is one embodiment of the invention arch rib interface sectional view;
Fig. 4 is the built-in fitting schematic diagram with preformed hole;
Fig. 5 is the built-in fitting schematic diagram with connecting rod.
Detailed description of the invention
As shown in Figure 1, ribbed arch bridge comprises bridge pier 1, arch rib. Bridge pier 1 adopts normal concrete, and arch rib adopts ultra-high performance concrete, and in figure, arch ring is made up of two separate type arch ribs. Adopt the assembled arch rib of cable hoisting. On two bridge piers, all set up the pylon 3 of certain altitude, main rope 4 is anchored on corresponding bridge pier 1. Before lifting arch rib prefabricated components 2, first concrete members surface stain, foreign material are cleaned out, in arch rib prefabricated components 2 interfaces and preformed hole 10, smear epoxide-resin glue, and then successively arch rib prefabricated components 2 are carried out to symmetrical hoisted in position.
The inventive method comprises the following steps:
1. mix Design. Water-cement ratio gets 0.16~0.22, aggregate-to-cement ratio gets 0.8~2.0, adopts proportioning cement: silicon ash: fine-ground fly-ash: quartz sand: high efficiency water reducing agent: water: steel fibre=1:0.25:0.25:1.2:0.04:0.3:0.02 (quality proportioning) carries out ultra-high performance concrete preparation. Wherein, cement adopts 525#Portland cement; Silicon ash is selected the canescence fines silica flour of grading limit at 0.1~1mm; Fine-ground fly-ash average grain diameter is 5.8 μ m; Quartz sand average grain diameter is 250 μ m, and particle size range is limited between 150~600 μ m; The high efficiency water reducing agent that high efficiency water reducing agent uses water-reducing rate to be greater than 30%; Water is general running water; Steel fibre diameter 0.2mm, length are 12mm.
2. as shown in Figure 2, earth's surface is peace and quiet, leveling, paving is filled out one deck 20cm Base with Sand Gravel Cushion thereon, on bed course, be evenly paved with chock maintenance level, bed die is hung on chock 6 and positioned, locate and side form 7 is installed by arc rib alignment and keep vertically, bed die and side form 7, after fixing, the good framework of steel reinforcement of colligation is hung in mould bases, preburied component is installed at mould bases two ends, wherein on the preburied component of one end, offer preformed hole 10, the preburied component of the other end is provided with the connecting rod 9 that size is mated with preformed hole 10, preformed hole and connecting rod are as shown in Figure 4 and Figure 5, wherein preburied component adoptsSpiral, first, second sections arch rib of formwork erection after-pouring, builds also maintenance and, after specified intensity, the second sections is put into first segment fragment position, and taking the second sections as Side Template, vertical Section of three Side Template, builds, and builds successively afterwards follow-up sections arch rib.
3. the order that stirs moulding is as follows: first cement, silica flour, fine-ground fly-ash, quartz sand are poured in mixer, dry mixing, adds water afterwards, stirs, add high efficiency water reducing agent, continue to stir, finally add steel fibre, then stir, then mixture is poured in prefabricated die trial, through dither vibration compacting aftershaping, arch rib prefabricated components 2 are put into water tank, maintenance 4 days under 80~100 DEG C of hot water environments.
4. arch rib prefabricated after, on two bridge piers, all set up the pylon 3 of certain altitude, every bank is established a hoisting winding and a rack winch, main rope 4 is anchored on corresponding bridge pier 1.
5. with reference to shown in Fig. 3, before lifting arch rib prefabricated components 2, first concrete members surface stain, foreign material are cleaned out, in arch rib prefabricated components 2 interfaces and preformed hole 10, smeared epoxide-resin glue, and then successively arch rib prefabricated components 2 are carried out to symmetrical hoisted in position. In lifting process, when the arch rib prefabricated components 2 of lifting need slow down lifting speed during near bridge pier 1 or last contiguous prefabricated member, make connecting rod 9 first aim at preformed hole 10, slowly advance again afterwards, until connecting rod 9 insert completely in preformed hole 10 and prefabricated components interface agree with intact. Wherein in epoxide-resin glue component binding agent to select the trade mark be 6101 epoxy resin. Observe top absolute altitude by spirit level, until prefabricated components reach design attitude.
6. arch rib prefabricated components 2 reach after design attitude, good arch rib in place are fixed with knotted rope 5, wait for that epoxy resin solidifies, and arch rib installs.
Arch rib prefabricated components 2 two ends are provided with and connect step 11, facilitate adjacent arch rib prefabricated components to be connected and fixed better.

Claims (6)

1. an arch rib, is characterized in that, this arch rib connected successively by multistage arch rib prefabricated components andBecome, described arch rib prefabricated components are made up of reinforcing bar and ultra-high performance concrete material, described archRib prefabricated components one end offers multiple preformed holes (10), described arch rib prefabricated components anotherEnd is fixed with multiple sizes and mates connecting rod (9) with described preformed hole (10) size; AdjacentTwo arch rib prefabricated components in, the connecting rod (9) of one of them arch rib prefabricated components one endInsert in the preformed hole (10) of another arch rib prefabricated components one end; Described very-high performance is mixedSolidifying soil is by cement, silicon ash, fine-ground fly-ash, quartz sand, high efficiency water reducing agent, water and steel fibreTie up formulatedly, get 0.16~0.22 when glue mass ratio, sand-lime mass ratio gets 0.8~2.0Time, cement: silicon ash: fine-ground fly-ash: quartz sand: high efficiency water reducing agent: water: steel fibreMass ratio be=1:0.25:0.25:1.2:0.04:0.3:0.02; Cement adopts 525#SilicateCement; Silicon ash is selected the canescence fines silica flour of grading limit at 0.1~1mm; Pulverized powderCoal ash average grain diameter is 5.8 μ m; Quartz sand average grain diameter is 250 μ m, and particle size range existsBetween 150~600 μ m; The high efficiency water reducing agent that high efficiency water reducing agent uses water-reducing rate to be greater than 30%;Steel fibre diameter is that 0.2mm, length are 12mm.
2. arch rib according to claim 1, is characterized in that, described arch rib prefabricated components twoEnd is equipped with and connects step (11).
3. an arch rib prefabricated components preparation method, is characterized in that, the method is:
1) by earth's surface leveling, fill out the thick Base with Sand Gravel Cushion of 20cm on upper berth, earth's surface, equal on Base with Sand Gravel CushionEven laying chock (6) also keeps described chock (6) upper surface level, on chock (6)Multiple mould bases are set, and described mould bases comprises bed die and side form (7), and described bed die is fixed on padWood (6) is upper, described bed die length, width, shape all with arch rib length, width, shapeCoupling; Two of described bed die compared with the side form (7) that is all fixed with vertical setting on long side;The good reinforcing bar of colligation is fixed in mould bases, built-in fitting, wherein one end are installed at mould bases two endsBuilt-in fitting be provided with preformed hole (10), on the built-in fitting of one end, be fixed with described in additionThe connecting rod (9) of preformed hole size coupling;
2) cement, silica flour, fine-ground fly-ash, quartz sand are poured in mixer, dry mixing, afterwardsAdd water, stir, add high efficiency water reducing agent, continue to stir, finally add steel fibre, thenStir, then mixture is poured in mould bases, through dither vibration compacting aftershaping,Obtain multiple arch rib prefabricated components, described multiple arch rib prefabricated components are put into water tank,Maintenance 4 days under 80~100 DEG C of hot water environments; Wherein, glue mass ratio gets 0.16~0.22,Sand-lime mass ratio gets 0.8~2.0, cement: silicon ash: fine-ground fly-ash: quartz sand: efficientWater reducer: water: the mass ratio of steel fibre is 1:0.25:0.25:1.2:0.04:0.3:0.02.
4. arch rib prefabricated components preparation method according to claim 3, is characterized in that waterMud adopts 525#Portland cement; Silicon ash is selected the canescence of grading limit at 0.1~1mmFines silica flour; Fine-ground fly-ash average grain diameter is 5.8 μ m; Quartz sand average grain diameter is 250μ m, particle size range is between 150~600 μ m; High efficiency water reducing agent uses water-reducing rate to be greater than 30%High efficiency water reducing agent; Steel fibre diameter is that 0.2mm, length are 12mm.
5. an installation method that adopts the prefabricated arch rib of ultra-high performance concrete, is characterized in that, shouldMethod is:
1) on two bridge piers (1), respectively set up a pylon (3), main rope (4) two ends are dividedBe not anchored on described two bridge piers (1);
2) in the preformed hole of arch rib prefabricated components one end, smear epoxide-resin glue, and arch rib is prefabricatedLifting component is to main rope (4) below, in lifting process, when the prefabricated components that lift by crane are near bridgeWhen pier or last contiguous prefabricated member, slow down lifting speed, connecting rod (9) is first aimed in advanceBox out (10), again connecting rod (9) is advanced in preformed hole (10) afterwards, until connectBar (9) inserts in preformed hole (10) completely and prefabricated components interface agrees with intact; Wherein twoIndividual bridge pier (1) is fixedly connected with an arch rib prefabricated components one end respectively; Two adjacent archesIn rib prefabricated components, the connecting rod (9) of one of them arch rib prefabricated components one end inserts anotherIn the preformed hole (10) of individual arch rib prefabricated components one end; Several arch rib prefabricated components connectThe final arch rib that forms.
6. the installation method of the prefabricated arch rib of employing ultra-high performance concrete according to claim 5,It is characterized in that described step 2) in, it is 6101 epoxy tree that epoxide-resin glue is selected the trade markFat.
CN201410139716.XA 2014-04-04 2014-04-04 A kind of precast splice type arch rib of ultra-high performance concrete and fabrication and installation method thereof CN103898831B (en)

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