CN102953341B - A kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock - Google Patents
A kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock Download PDFInfo
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- CN102953341B CN102953341B CN201210536150.5A CN201210536150A CN102953341B CN 102953341 B CN102953341 B CN 102953341B CN 201210536150 A CN201210536150 A CN 201210536150A CN 102953341 B CN102953341 B CN 102953341B
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Abstract
The invention belongs to field of bridge construction, be specifically related to a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock.Its concrete scheme is as follows: described high-order trestle specifically comprises the pontic of trestle and supports the steel pipe pile of described pontic, steel pipe pile is arranged on steep bare rock face, the bottom inner chamber of described steel pipe pile is connected grappling with between described steep bare rock by anchor pole, and the underwater concrete layer consolidation by building between three is structure as a whole.Advantage of the present invention is, steel pipe pile is connected with steep bare rock face and adopts the embedding rock anchors structure of slip casting, rely on the bond stress of underwater concrete slurry and anchor pole, stake base concrete and riverbed basement rock, to make steel pipe pile firmly be anchored on steep bare rock face, short construction period, cost are low, safe and efficient.
Description
Technical field
The invention belongs to field of bridge construction, be specifically related to a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock.
Background technology
Along with socioeconomic development, demand for convenient traffic is further strong, be built in various geologic bridge engineering also to get more and more, in bridge water in foundation construction, extensive employing trestle is as the construction passage of material, equipment and personnel, and domestic trestle many employings steel pipe pile adds the frame mode of Bailey truss.But trestle in the past is generally all built in be had compared with on the rivers of thick-covering and lake, under this geological conditions, Conveyor belt construction towards major project is general adopts traditional " halieutics " to carry out, after in place by steel pipe pile, by pile hammer inserted to play steel pipe pile to covering layer design elevation.But, a lot of rivers, lake and Marine Geology situation is had to be inclined uncovered rock face and shallow overburden inclined rock base, construct as adopted conventional method, due to the role and influence of current, stormy waves and wind load, the anchoring of mouth at the bottom of the stable and steel pipe pile of Conveyor belt cannot be guaranteed, thus affects the security performance of trestle and the construction speed of major project.
For the geological condition of above-mentioned intectate steep bare rock, prior art often adopts underwater demolition, artificial covering layer, jacket, scar preexisting hole to be embedded into the schemes such as steel pipe.
Underwater demolition: Wuhan-Guangzhou passenger-dedicated line emphasis Bridge Project, pier position place depth of water 18m in water, naked oblique rock surface becomes 35 °, adopt drilling platform scheme, the scar explosion leveling of first will tilt, then arrange steel pile casting, on riverbed, casing buried underground by throwing sandbag, rely on the existing stake of nearly Dun Chu to carry out stabilized platform, thus form drilled pile platform.This scheme needs underwater demolition, and scarfing cinder workload is large, and the cycle is large, and cost is high, and needs existing stake to maintain the stable of platform.
Artificial covering layer: certain Bridge Project on the Liujiang of Liuzhou, pier position place depth of water 15m in water, naked oblique rock surface becomes 15 °, adopts drilling platform scheme, first at the thick earth bag of pier position place throwing 3m, then inserted to play steel pipe pile.Artificial covering layer scheme need in flat roof area a large amount of earth bag of throwing, engineering quantity is large, and construction cost is high.
Jacket: Shanghai Bridge at Sea nearly island section engineering, bridge location sea bed is shallow overburden and naked rock, jacket trestle is adopted to be subaqueous work passage, adopt jacket platform as the drilling platform of pier main in water, be linked to be jacket by land with the steel pipe of many diameter 1.1m during construction, then shipping is to pier position place, hang ship with large 1500t and hang installation, this scheme needs large-tonnage to hang ship and workboat, and steel using amount is large, and construction period is longer.
Scar preexisting hole is embedded into steel pipe: the pier in water depth of water 26m of Zhejiang bridge, riverbed intectate, scar is 45 ° of inclinations, trestle, platform construction adopt preexisting hole to be embedded into the fixing constructure scheme of steel pile casting, namely in trestle steel pipe pile position with the percussive drill preexisting hole being greater than pile tube diameter, pile tube at preexisting hole after putting into steel pipe pile pours into a mould underwater concrete outward, it is directly stabilized in rock stratum.This scheme construction period is longer, need operation on floating platform, and water level need be more stable, and flow velocity is little.
In sum, all there is the shortcomings such as workload is large, long construction period, cost are large in above scheme.
Therefore those skilled in the art is badly in need of a kind of high-order trestle construction method and the vibrational power flow thereof that effectively can solve the connectivity problem of steel pipe pile and precipitous hard naked rock river bed, can reach that short construction period, cost are low, object safely and efficiently simultaneously.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock is provided, this high-order trestle work structure is by cutting into the shape suitable with steep bare rock face by mouth at the bottom of described steel pipe pile on the coast, build underwater concrete layer within it, rely on the bond stress of underwater concrete slurry and anchor pole, stake base concrete and riverbed basement rock, solve the anchoring of steel pipe pile on precipitous hard naked rock, Against Sliding Stability problem to reach.
The object of the invention realizes being completed by following technical scheme:
A kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock, be specifically related to steep bare rock, be positioned at abutment on the bank, be positioned at bridge pier on the bank, steel pipe pile and Bailey truss, it is characterized in that described high-order trestle specifically comprises the pontic of trestle and supports the bridge pier of described pontic and some steel pipe piles, described steel pipe pile top is fixedly connected with described pontic, be arranged on steep bare rock face bottom described steel pipe pile, the bottom inner chamber of described steel pipe pile is connected by anchor pole grappling with between described steep bare rock, and the underwater concrete layer consolidation by building between three is structure as a whole.
Mouth-shaped at the bottom of described steel pipe pile and described steep bare rock face shape suitable.
Underwater concrete layer height bottom described steel pipe pile is not less than described anchor pole and enters the rock degree of depth.
The length of described anchor pole more than steep bare rock face is not less than the length that it gos deep into steep bare rock.
Connection structure between stake is provided with between described each steel pipe pile.
Advantage of the present invention is, (1) adopt undersea detection technology and by detection data on the coast mouth at the bottom of precut steel pipe pile make itself and steep bare rock face suitable, safe and efficient, reduce deep diving workload, reduction construction risk; (2) simultaneously steel pipe pile is connected with steep bare rock face and adopts the embedding rock anchors structure of slip casting, rely on the bond stress of underwater concrete slurry and anchor pole, stake base concrete and riverbed basement rock, to make steel pipe pile firmly be anchored on steep bare rock face, short construction period, cost are low, safe and efficient; (3) cantilever method construction bridge is adopted, namely prior to the first hole trestle of constructing on the bank, follow-up trestle installs Bailey truss, steel pipe pile by crawler crane cantilever, and whole trestle is set up only needs a pedrail crane to coordinate, without the need to employing large-scale above-water hoisting equipment, remarkable in economical benefits; (4) steel pipe pile is at bank spreading, and whole long lifting puts in place, avoids weld job waterborne, reduces security risk, is conducive to the control of steel pipe pile verticality, welding quality etc.
Accompanying drawing explanation
Fig. 1 is construction flow chart of the present invention;
Fig. 2 is high-order trestle lateral view in the present invention;
Fig. 3 is high-order trestle front view in the present invention;
Fig. 4 is high-order trestle top view in the present invention;
Fig. 5 is abutment structural representation in the present invention;
Fig. 6 is leading truck structural layout plan in the present invention;
Fig. 7 is steel pipe pile spreading schematic diagram in the present invention;
Fig. 8 is rockbolt installation schematic diagram in the present invention;
Fig. 9 is anchor pole steel tube pile embeded in rock schematic diagram in the present invention.
Detailed description of the invention
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
Be respectively as marked 1-27 in Fig. 1-9, figure: abutment 1, first hole trestle 2, bridge pier 3, second hole trestle 4, connection structure 5, steel pipe pile 6, underwater concrete layer 7, steep bare rock face 8, checkered plates 9, longitudinal distribution beam 10, transverse distribution beam 11, Bailey truss 12, stake head piece 13, anchor pole 14, block 15, block rubber 16, anchor pole 17, bracing frame 18, leading truck 19, stiffening plate 20, short steel pipes stake 21, madjack pipe 22, drilling rod 23, dry-mix concrete bag 24, anchor hole 25, cement paste 26, pontic 27.
Embodiment: the present embodiment is specifically related to a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock, this kind of high-order trestle work structure is applicable to that deep water river, flow velocity are large, flood season rises suddenly and sharply mountain stream, intectate river and riverbed is precipitous or the hard naked rock hydrogeological conditions that tilts.The present embodiment will be that example is described in detail in conjunction with Qianjiang grand bridge engineering, and Qianjiang belongs to mountain stream, and flow is large, current are anxious, and Peak Flow Rate reaches 3.21m/s, riverbed intectate, basement rock is middle Baiyun rock mantle, compressive strength 80 MPa, extends to bank always, and within the scope of the 65m of offshore limit, riverbed is precipitous, scar is 35 ~ 53 ° of inclinations, pier place oblique rock surface about about 25 ° in water, and riverbed height rises and falls, stalagmite stands in great numbers.The bridge pier that conveniently constructor enters Jiang Zhongxin is constructed, needs to set up trestle towards bridge pier at both sides, river bank slope.
As Fig. 2,9 is depicted as the concrete structure of high-order trestle in the present embodiment, high-order trestle specifically comprises the pontic 27 of trestle and supports the steel pipe pile 6 of pontic 27, steel pipe pile 6 is arranged on steep bare rock face 8, underwater concrete layer 7 has been built bottom steel pipe pile 6, the anchor hole 25 being through to inside, steep bare rock face 8 is offered from the upper surface of underwater concrete layer 7, in anchor hole 25, be provided with anchor pole 14, anchor pole 14 is integrated by cement paste 26 and underwater concrete layer 7 anchoring bottom the inner basement rock in steep bare rock face 8 and steel pipe pile 6 simultaneously.
As shown in figs 1-9, be below the structure of high-order trestle in deep water torrent intectate steep bare rock and the concrete steps of construction thereof:
1. carry out the construction of abutment 1 first on the coast, abutment 1 can adopt inverted T shape or L-type structure, boring also skyhook 17 on the scar of riverbank, and the upper end of anchor pole 17 is stretched in abutment 1, the anchoring of perfusion M35 cement mortar; At the pre-buried shaped steel in the position of Bailey truss 12 or steel plate, install after Bailey truss 12, welding shaped steel restriction Bailey truss along bridge to, direction across bridge, vertical direction move.
2. bridge pier 3 is constructed on the bank, bridge pier 3 is positioned on exposed riverbank basement rock, adopt reinforced concrete strip foundation, riverbank scar is holed, and skyhook, stretches into strip foundation, the anchoring of perfusion M35 cement mortar, described strip foundation steel pipe pile position pre-embedded steel slab, after concreting, installs connection structure 5, stake head piece 13 between steel pipe pile, stake.
3. Bailey truss 12, bridge floor longitudinal distribution beam 10, transverse distribution beam 11, checkered plates 9, railing are installed thereafter on abutment 1 and bridge pier 3, complete setting up of the pontic 27 of the first hole trestle 2 on the bank; On the coast Bailey truss 12 to be installed for next hole is spliced into entirety, crawler crane is to the Bailey truss 12 of free cantilever erection second hole, side, middle of the river trestle 4.Number row Bailey truss 12 is spliced into the overall pontic 27 forming the second hole trestle 4, gradation rigging out, and bracing frame 18 is set between Bailey truss 12, in order to increase the integral rigidity of bracketed part Bailey truss 12.After the second hole trestle 4 is set up, arrange leading truck 19 in its end near side, the middle of the river, leading truck 19 adopts channel-section steel to make, and is bolted, and is fastened on the upper and lower chord member of Bailey truss 12 by U-shaped.
4. before steel pipe pile 6 is installed, the probe of depth-sounder and wire are fixed in Metallic rod, its probe is not in underwater 30cm, along mounted leading truck 19 eight equal parts point, measure the inclined rock base depth of water in steep bare rock face 8, length and the end mouth discrepancy in elevation thereof of steel pipe pile 6 can be determined according to each point depth of water recorded, on the coast the end mouth of steel pipe pile 6 is cut into the shape suitable with steep bare rock face 8 according to this end mouth discrepancy in elevation, steel pipe pile 6 is spliced by some short steel pipes stake 21 spreadings, when short steel pipes stake 21 is docked, end face opens groove, ensure welding quality, the simultaneously weld reinforcement plate 20 being evenly arranged along steel pipe pile 6 girth when spreading, the wherein said concrete model of underwater bathy metry instrument is the portable depth-sounder of HD-360, erection one soundd navigation and ranging is installed on steep bare rock face 8 simultaneously, scar situation under water can show in the mode of image by this soundd navigation and ranging, specifically for follow-up steel pipe pile 6 under water install, underwater concrete layer 7 build in engineering, what check the implantation situation of steel pipe pile 6 and underwater concrete layer 7 builds situation, instead of the operation of diver.
According to the order being from upstream to downstream, steel pipe pile 6 is installed when 5. selecting water flow stationary, flow velocity low; According to absolute altitude at the bottom of riverbed, carry out mark steel pipe pile 6 is suitable for reading, indicate direction, in order to avoid steel pipe pile 6 direction deflects after lower water, misfit with steep bare rock face 8; Rely on steel pipe pile 6 self gravitation, ensured the verticality of steel pipe pile 6 by crawler crane slight shift; After steel pipe pile 6 installs, confirmed the implantation situation of steel pipe pile 6 by soundd navigation and ranging, the space between the suitable for reading of steel pipe pile 6 and leading truck 19 is carved extremely with iron plate simultaneously, prevent steel pipe pile 6 from producing in follow-up construction and rock.
6. sending diver to enter water and enclose dry-mix concrete bag 24 along 50cm place pile one outside the end mouth of steel pipe pile 6, is highly 50 ~ 80cm; Adopt vertical conduit method C30 concrete under priming petock in steel pipe pile 6, along with concrete rises in steel pipe pile 6, concrete is under inside and outside differential pressure effect, outwards flow out along the gap between steel pipe pile 6 and steep bare rock face 8, be filled between dry-mix concrete bag 24, form a little cofferdam under water, simultaneously at the end interruption-forming underwater concrete layer 7 of steel pipe pile 6, the height of underwater concrete layer 7 is not less than the degree of depth of the embedding rock of anchor pole 14 thereafter; During pouring underwater concrete, underwater detectoscope can be utilized to monitor concreting situation inside and outside steel pipe pile 6, occur abnormal conditions or after having built, arrange diver to carry out confirmation inspection to situation at the bottom of stake in time.
7. after in steel pipe pile 6, underwater concrete layer 7 placing intensity reaches 70%, geological drilling rig moves to leading truck place, in steel pipe pile internal drilling; The drill bit of geological drilling rig, should drilling well at a slow speed after by the underwater concrete layer 7 bottom steel pipe pile 6, prevents drill bit sideslip; After drill bit enters competent bed 50cm, by counterweight, strengthen the pressure of the drill, accelerate rate of penetration; When entering basement rock, answering core taking inspection, confirming starting point and the degree of depth in face, rock stratum, in pore forming process, when joint fissure is intensive, broken serious when rock stratum, pressure injection high-strength cement first should be taked to starch and to make rock mass consolidation, redrilling after some strength is reached, until anchor hole 25 to design elevation until slurry.
8. on anchor pole 14, bundle pressure-resistant plastic madjack pipe 22, madjack pipe 22 bottom is apart from anchor pole 14 bottom 100mm, in case the pipe laying that back-silts of holing, trestle top is stayed on top; By the drilling rod 23 of geological drilling rig, anchor pole 14 is seated in anchor hole 25, removes the drilling rod 23 of described geological drilling rig subsequently.To compressed water slurry 26 in anchor hole 25, when mud jacking starts, mixing has also laid in cement paste 26, ensures the continuity of mud jacking process, after cement paste 26 stirs, with pneumatic mortar machine from plastics madjack pipe 22 to mud jacking bottom anchor hole 25.For meeting the seepage of borehole anchorage section crevice water mud 26 and preventing the water enchroachment (invasion) of top water mud, the size of groundwater increment is determined by field experiment.Utilize underwater detectoscope to observe mud jacking situation in mud jacking process, cement paste 26 is depressed into underwater concrete layer 7 end face in steel pipe pile 6.Thereafter anchor pole 14 resistance to plucking static loading test is carried out.
9. when steel pipe pile 6 bottom water mud 26 anchoring body compressive strength reaches 70%, remove leading truck 19, bracing 5, stake head piece 13 between steel pipe pile 6 each stake is installed; Continue assembled truss to direction, the middle of the river and the pontic 27 that bridge floor longitudinal distribution beam 10, transverse distribution beam 11, checkered plates 9 and bridge floor railing form the 3rd hole trestle is installed simultaneously.
10. be still, at the 3rd hole trestle tail end, three, location leading truck is installed after, by 3. above-mentioned ~ 9. in same method by that analogy, until complete the construction of bed rearrangement trestle.
The feature of this high-order trestle work structure and construction method thereof can be classified as following some:
(1) rise suddenly and sharply at flood season level, flow velocity be large, riverbed is on the mountain area tachydromile of precipitous hard naked rock, adopt trestle scheme waterborne, solve the construction access issues of pier in water, convenient construction, save hang fare with, accelerate progress.
(2) in riverbed be precipitous hard naked rock deep water river on, conventional underwater demolition and artificial covering layer technique are broken, the embedding rock anchors technology of slip casting is adopted to set up trestle, its construction technology is simple, the cycle is short, cost is low, safe, efficiently, reliably to solve steel pipe pile and precipitous hard naked rock river bed connectivity problem.
(3) trestle is without the need to arranging braking pier in water, and by abutment and riverbed basement rock anchoring, opposing to horizontal force along bridge, is saved material, reduced costs.
(4) cantilever method construction bridge is adopted, namely prior to constructing one on the bank across trestle, follow-up trestle installs Bailey truss, steel pipe pile by crawler crane cantilever, and whole trestle is set up only needs a pedrail crane to coordinate, without the need to employing large-scale above-water hoisting equipment, remarkable in economical benefits.
(5) steel pipe pile is at bank spreading, and whole long lifting puts in place, avoids weld job waterborne, reduces security risk, is conducive to the control of steel pipe pile verticality, welding quality etc.
Claims (3)
1. one kind is arranged at the high-order trestle work structure in deep water torrent intectate steep bare rock, be specifically related to steep bare rock, be positioned at abutment on the bank, be positioned at bridge pier on the bank, steel pipe pile and Bailey truss, it is characterized in that described high-order trestle specifically comprises the pontic of trestle and supports the bridge pier of described pontic and some steel pipe piles, described steel pipe pile top is fixedly connected with described pontic, be arranged on steep bare rock face bottom described steel pipe pile, the bottom inner chamber of described steel pipe pile is connected by anchor pole grappling with between described steep bare rock, and the underwater concrete layer consolidation by building between three is structure as a whole, underwater concrete layer height bottom described steel pipe pile is not less than described anchor pole and enters the rock degree of depth, and the length of described anchor pole more than steep bare rock face is not less than the length that it gos deep into steep bare rock.
2. a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock according to claim 1, it is characterized in that mouth-shaped at the bottom of described steel pipe pile and described steep bare rock face shape suitable.
3. a kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock according to claim 1, is characterized in that being provided with connection structure between stake between described each steel pipe pile.
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| CN201210536150.5A CN102953341B (en) | 2012-12-13 | 2012-12-13 | A kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock |
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| CN201210536150.5A CN102953341B (en) | 2012-12-13 | 2012-12-13 | A kind of high-order trestle work structure be arranged in deep water torrent intectate steep bare rock |
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| CN104047222B (en) * | 2013-03-14 | 2018-02-16 | 上海市政工程设计研究总院（集团）有限公司 | One kind is close to mountain bridge structure and its construction method near water |
| CN103306202B (en) * | 2013-06-14 | 2015-04-29 | 中铁大桥局集团第二工程有限公司 | Steel panel used in fabricated Bailey truss in matching manner |
| CN103898910A (en) * | 2014-03-10 | 2014-07-02 | 中交一航局第三工程有限公司 | Method for anchoring trestle steel pipe piles on seabed rock bare landform |
| CN104929044A (en) * | 2014-04-04 | 2015-09-23 | 重庆建工桥梁工程有限责任公司 | Construction method for offshore steel trestle |
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| CN107386285A (en) * | 2017-08-03 | 2017-11-24 | 中铁六局集团有限公司 | A kind of novel steel tube pile foundation rock borehole anchorage method |
| CN107574813A (en) * | 2017-08-09 | 2018-01-12 | 贵州正业工程技术投资有限公司 | The device and construction method of Soil-rock combined ground are passed through in a kind of karst area |
| CN107700366B (en) * | 2017-11-20 | 2019-08-27 | 中铁二十局集团第一工程有限公司 | Deep water high-block bridge degree the bridge construction naked rock river bed trestle of hard stone and construction method |
| CN108547276B (en) * | 2018-05-28 | 2023-11-28 | 宁波交通工程建设集团有限公司 | Water sand-filled rock-socketed steel pipe pile working platform and construction method thereof |
| CN108625365A (en) * | 2018-06-20 | 2018-10-09 | 湖南建工交通建设有限公司 | Improve prestress and cultivation stake composite structure and the construction method of steel trestle antidumping |
| CN108660909A (en) * | 2018-07-24 | 2018-10-16 | 东北大学 | A kind of prefabricated steel and concrete combination beam trestle and construction method |
| CN110409281B (en) * | 2019-08-12 | 2024-03-15 | 中交隧道工程局有限公司 | Deepwater bare rock steel trestle |
| CN110847047B (en) * | 2019-11-21 | 2021-11-26 | 中交二航局第一工程有限公司 | Open sea bare rock trestle construction method |
| CN114855588A (en) * | 2022-04-14 | 2022-08-05 | 中建铁路投资建设集团有限公司 | Temporary construction transfer platform ramp trestle combination |
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