CN102704401A - Multizone pre-pressing technology for full framing - Google Patents
Multizone pre-pressing technology for full framing Download PDFInfo
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- CN102704401A CN102704401A CN2012101676385A CN201210167638A CN102704401A CN 102704401 A CN102704401 A CN 102704401A CN 2012101676385 A CN2012101676385 A CN 2012101676385A CN 201210167638 A CN201210167638 A CN 201210167638A CN 102704401 A CN102704401 A CN 102704401A
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Abstract
The invention discloses a multizone pre-pressing technology for a full framing. The multizone pre-pressing technology comprises: (a) treating the foundation of the full framing, (b) selecting a zone to be pre-pressed, (c) pre-pressing the zone, (d) observing settlement and recording data. Such method can shorten construction period, save pre-pressing material and greatly lower construction cost, and has good economic and social benefits.
Description
Technical field
The present invention relates to the pre-pressing bracket technology in the bridge engineering, design the subregion precompressed technology of full framing especially.
Background technology
General municipal bridge adopts the job practices construction of " first beam rear arch ", and promptly elder generation's cast-in-place girder on support is then set up support and set up steel tube arch rib on girder; The pumping line inner concrete becomes arch; The suspension rod of constructing is again removed falsework, construction bridge deck and accessory structure.
In order to guarantee construction safety, improve the construction quality of cast-in-situ box girder, after support is set up completion and case beam bottom board laying completion, need carry out precompressed to support.Precompressed not only can be eliminated the nonelastic deformation of support and ground, and the elastic deformation value that also can obtain support is simultaneously reserved the foundation of camber as construction.Support is carried out precompressed, is that support is carried out whole precompressed the most reliably.But along with the development of municipal bridge construction, the cast-in-situ bridge of super-long and super-wide is more and more, and whole precompressed not only needs a large amount of prepressing materials, and after the completion precompressed, the processing of prepressing materials also is a very big problem.Because prepressing materials is difficult to raise, so some unit is under the not enough situation of preloading quantity at present, not limited bracket cave-in accident has taken place in construction by force, has threatened the people's lives and property safety.In addition, the preloading and the unloading of prepressing materials need the plenty of time, can cause very big influence to the duration.Though the overall time precompressed is comparatively reliable, operating to waste great amount of manpower and material resources, and economic benefit is relatively poor.
Summary of the invention
In order to overcome above-mentioned deficiency, the object of the invention be to provide a kind of comparatively reliable, the duration shortens and lower-cost full framing subregion precompressed technology.
To achieve these goals, the technical scheme that the present invention adopts is: a kind of full framing subregion precompressed technology comprises:
(a) ground of full framing being handled (b) selects precompressed zone (c) that precompressed (d) observation sedimentation and record data are carried out in said precompressed zone.
Preferably, the said mode that the ground of full framing is handled:
(a1) excavate an interior soft soil horizon that exists, change and fill out processing;
(a2) change to fill out to adopt between part and the former soil layer and dig step width and be connected;
(a3) do not exist the scope of soft soil horizon to roll repeatedly, directly roll again behind the making hardcore bed, build thick concrete plate;
(a4) cast-in-situ reinforced concrete slab;
(a5) full framing ground end face is an axis of symmetry with the bridge center line, establishes 0.5% two-way horizontal wall inscription, closes on the full framing both sides of the edge gutter is set.
Preferably, select said precompressed zone to follow following principle:
(b1) the bigger zone of load distribution;
(b2) ground in this zone has typicalness and representativeness;
(b3) zone that combines of evenly distributed load and point load;
(b4) junction of dissimilar rack platforms.
Preferably, prepressing materials adopts sand pocket, and sand unit weight is by the numerical computations that records through field sampling;
Preferably, adopt three grades of load modes when precompressed is carried out in said precompressed zone, loading procedure is the first intermediate and then both sides.
Preferably, said three grades of load modes comprise that 60%, 80%, 100% substep loads.
Preferably, said observation sedimentation comprise before the concreting with concreting after.
Preferably, stride the footpath smaller or equal to 40m, the layout of settlement observation point is striden the footpath according to 1/4 and is confirmed.
Preferably, stride the footpath greater than 40m, the layout of settlement observation point is confirmed according to 10m.
Beneficial effect of the present invention: full framing adopts the subregion precompressed, not only can the reduction of erection time, can also save prepressing materials, and reduce construction cost significantly, have good economic benefits and social benefit.
Description of drawings
Fig. 1 is a full framing subregion precompressed technology sketch map of the present invention.
Fig. 2 is a deformation of timbering of the present invention monitoring point floor map.
Fig. 3 is that the transverse plane sketch map is arranged in end bay span centre monitoring point.
Fig. 4 is a subsidence curve at the bottom of the concreting rear cabinet beam of the present invention.
The specific embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention, makes of the present invention above-mentioned and other purposes, characteristic and advantage are more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly proportionally do not draw accompanying drawing, focus on showing purport of the present invention.
Below in conjunction with Fig. 1 to Fig. 3 full framing subregion precompressed technology of the present invention is elaborated.
Wherein, Fig. 1 is a full framing subregion precompressed of the present invention technology sketch map, and Fig. 2 is a deformation of timbering of the present invention monitoring point floor map, and Fig. 3 is a subsidence curve at the bottom of the concreting rear cabinet beam of the present invention.
As shown in Figure 1, full framing subregion precompressed technology of the present invention may further comprise the steps: (a) ground of full framing is handled (b) and select precompressed zone (c) that precompressed (d) observation sedimentation is carried out in the precompressed zone.
Ground to full framing is handled the following mode of taking:
(a1) excavate an interior soft soil horizon that exists, change and fill out processing.
According to arrangement diagram, and combination is actual, finds out an interior soft soil horizon distribution that needs processing.
Adopt 0.6m
3Excavator cooperates dump truck, and mud is partly excavated outer abandoning, the cleaning degree of depth 3.0 ~ 4.0m; Be filled to design elevation 27.84m with removing with changing; Change underfill material and select mountain gravel soil for use, adopt the compacting of 22t single vibratory road roller, mud change fill out darker zone also can be in the bottom jackstone; Backfill mountain, smooth back gravel soil is with the compaction in layers of 22t single vibratory road roller;
(a2) adopt between mountain gravel earthen backfill part and the former soil layer and dig step width 100cm and be connected.
Change fill out end after, upper berth 20cm hardcore bed is built the thick C25 concrete slab of 30cm again, configuration 10 * 10cm Φ 12 reinforced mesh in the plate.
(a3) do not exist the scope of soft soil horizon to roll repeatedly with the single steel wheel vibratory roller of 22t, directly roll behind the making 20cm hardcore bed again, build the thick concrete plate of 30cm, the reinforced mesh configuration is with (a2).
(a4) cast-in-place C25 armored concrete slab plate top mark height is controlled to be 28.34m, and is consistent with absolute altitude at the bottom of the existing riverbed, no longer removes the effect in protection riverbed of having held concurrently after construction finishes.
(a5) whole full framing ground end face is an axis of symmetry with the bridge center line; If 0.5% two-way horizontal wall inscription makes things convenient for draining, close on the full framing both sides of the edge and 50 * 50cmM7.5# is set grouts common brick rectangle gutter, thickness 15cm (10# sand finish 2cm); Gutter longitudinal gradient 0.5%; Aspect 3# abutment, end are provided with φ 120 * 150cmM7.5 and grout machine brick sump, and rainwater can directly adopt submersible pump to be discharged into happy fate which brings lovers together river main stem.
Process range in: long 129.7m, wide 51m.
Following principle is mainly followed in the selection in precompressed zone:
(b1) the bigger zone of load distribution;
(b2) ground in this zone has typicalness and representativeness;
(b3) zone that combines of evenly distributed load and point load;
(b4) junction of dissimilar rack platforms.
In the present embodiment, whole cast-in-place box beam bracket is made up of two parts, shellfish thunder body panel and full framing.According to above principle, the position of the inclined to one side 5m of span centre was designated as the A district during decision was chosen.Find that according to the actual treatment situation ground processing representativeness in this precompressed zone is stronger, upper load distributes also more representative.The selected 10m full framing that is bordered with shellfish thunder frame is designated as the B district as other place precompressed zone.The A district at first carries out precompressed, proves the reliability of full framing, then the B district is carried out the steadiness that precompressed proof ground is handled.
The A district: precompressed zone inside ceiling panel thickness is 28cm, and base plate thickness is 25cm.Web is a variable cross-section, and width is 0.4m, and height change scope 2.317m ~ 2.793m for guaranteeing construction safety, adopts the highest cross section to calculate during calculating.Simultaneously, this zone comprises twice suspension rod crossbeam, and when load calculated, the suspension rod section of beam of getting regional middle calculated.The crossbeam width is 0.6m at suspension rod respective chamber/chambers width, length 14m, and non-suspension rod respective chamber/chambers width is 0.4m, length is 27m.According to above-mentioned load account form, the prefabricating load total amount that draws in the precompressed zone is 1365t.
The B district: precompressed zone inside ceiling panel, base plate thickness are variable cross-section, top plate thickness excursion: 28cm ~ 40cm, base plate thickness excursion: 25cm ~ 50cm.Web is a variable cross-section, change width scope 40cm ~ 72cm, height change scope 1.77m ~ 2.518m.Prefabricating load total amount in the precompressed zone is 1661.8t.
Prepressing materials adopts sand pocket, and sand unit weight is pressed 1.8t/m
3(this unit weight records through field sampling) calculates.Simulate the top actual loading during precompressed as far as possible, all spread earlier one deck sand pocket simulation cast-in-situ box girder top board and base plate load, pile up sand pocket at web and crossbeam position then.Adopt three grades of load modes, promptly 60%, 80%, 100% substep loads.Loading procedure should be followed the principle of first intermediate and then both sides, and symmetry loads according to code requirement.
The layout of settlement observation point will be striden footpath (stride footpath less than 40m) according to 1/4 and confirmed the measuring frequency section number with the principle of 10m (striding the footpath greater than 40m), and specific as follows: settlement observation point is vertically arranged five row altogether along bridge, horizontal five rows, and array pitch 2.5m is listed as apart from 10.25m.Observation point is laid on a top of the trellis and frame bottom correspondence position.More following being located on the concrete substrate, bed die is located on top.Case beam base plate observation point is with φ 100PVC pipe, and the pvc pipe rack arrangement in the direct insertion tube of Sopwith staff, is carried out reading during measurement on the head-to-foot mould on base plate.All observation points adopt the accurate setting-out of total powerstation, carry out distinguishing mark, protect.
In order further to guarantee the quality of case beam concreting, before the concreting of case beam begins and after building completion, need further observe case beam bottom settling data, data are as shown in Figures 2 and 3.
Full framing subregion precompressed of the present invention technology not only can the reduction of erection time, can also save prepressing materials, reduces construction cost significantly, has good economic benefits and social benefit.
In above description, a lot of details have been set forth so that make much of the present invention; But with foregoing description only is preferred embodiment of the present invention; The present invention can implement much to be different from other modes described here, so the present invention does not receive the restriction of top disclosed specific embodiment.Any those of ordinary skill in the art are not breaking away under the technical scheme scope situation of the present invention simultaneously; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Every content that does not break away from technical scheme of the present invention, all still belongs in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (9)
1. a full framing subregion precompressed technology is characterized in that: comprising: (a) ground of full framing is handled (b) and select precompressed zone (c) that precompressed (d) observation sedimentation and record data are carried out in said precompressed zone.
2. full framing subregion precompressed technology according to claim 1 is characterized in that: the said mode that the ground of full framing is handled:
(a1) excavate an interior soft soil horizon that exists, change and fill out processing;
(a2) change to fill out to adopt between part and the former soil layer and dig step width and be connected;
(a3) do not exist the scope of soft soil horizon to roll repeatedly, directly roll again behind the making hardcore bed, build thick concrete plate;
(a4) cast-in-situ reinforced concrete slab;
(a5) full framing ground end face is an axis of symmetry with the bridge center line, establishes 0.5% two-way horizontal wall inscription, closes on the full framing both sides of the edge gutter is set.
3. full framing subregion precompressed technology according to claim 1 is characterized in that: select said precompressed zone to follow following principle:
(b1) the bigger zone of load distribution;
(b2) ground in this zone has typicalness and representativeness;
(b3) zone that combines of evenly distributed load and point load;
(b4) junction of dissimilar rack platforms.
4. full framing subregion precompressed technology according to claim 1, it is characterized in that: prepressing materials adopts sand pocket, and sand unit weight is by the numerical computations that records through field sampling.
5. full framing subregion precompressed technology according to claim 1 is characterized in that: adopt three grades of load modes when precompressed is carried out in said precompressed zone, loading procedure is the first intermediate and then both sides.
6. full framing subregion precompressed technology according to claim 5 is characterized in that: said three grades of load modes comprise that 60%, 80%, 100% substep loads.
7. full framing subregion precompressed according to claim 1 technology is characterized in that: said observation sedimentation comprise before the concreting with concreting after.
8. full framing subregion precompressed technology according to claim 1 is characterized in that: stride the footpath smaller or equal to 40m, the layout of settlement observation point is striden the footpath according to 1/4 and is confirmed.
9. full framing subregion precompressed technology according to claim 1 is characterized in that: stride the footpath greater than 40m, the layout of settlement observation point is confirmed according to 10m.
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| CN2012101676385A CN102704401A (en) | 2012-05-28 | 2012-05-28 | Multizone pre-pressing technology for full framing |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061264A (en) * | 2012-12-08 | 2013-04-24 | 中铁三局集团有限公司 | Method and device for pre-pressing high-position support single column in water |
| CN103437291A (en) * | 2013-08-02 | 2013-12-11 | 中交二公局第一工程有限公司 | Integral water tank preloading construction process |
| CN103470041A (en) * | 2013-09-27 | 2013-12-25 | 中铁三局集团有限公司 | Loose sand loading pre-compaction construction method for cast-in-situ concrete beam form steel pipe support |
| CN105155425A (en) * | 2015-09-22 | 2015-12-16 | 深圳市市政工程总公司 | Fluid analogue simulation preloading construction method of full framing |
| CN106592437A (en) * | 2016-12-16 | 2017-04-26 | 曹晓滨 | Cast-in-situ construction method for cast-in-situ concrete bridge |
| CN107201827A (en) * | 2016-03-16 | 2017-09-26 | 中铁十五局集团有限公司 | Pre-pressing bracket construction method based on settlement observation |
| CN109137761A (en) * | 2018-09-29 | 2019-01-04 | 中铁二局集团有限公司 | A method of it controlling existing bridge and to widen bridge settlement poor |
| CN109267488A (en) * | 2018-10-16 | 2019-01-25 | 中铁四局集团有限公司 | A method of utilizing dynamic load precompressed beam sections bridge fabrication machine |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN110777635A (en) * | 2019-10-31 | 2020-02-11 | 中交路桥华南工程有限公司 | Side arch rib construction method and side arch rib |
| CN111005318A (en) * | 2019-12-03 | 2020-04-14 | 中交路桥华南工程有限公司 | Prepressing method of curved surface support |
| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061264A (en) * | 2012-12-08 | 2013-04-24 | 中铁三局集团有限公司 | Method and device for pre-pressing high-position support single column in water |
| CN103061264B (en) * | 2012-12-08 | 2015-05-13 | 中铁三局集团有限公司 | Method and device for pre-pressing high-position support single column in water |
| CN103437291A (en) * | 2013-08-02 | 2013-12-11 | 中交二公局第一工程有限公司 | Integral water tank preloading construction process |
| CN103437291B (en) * | 2013-08-02 | 2015-10-21 | 中交二公局第一工程有限公司 | Monolithic water tank precompressed construction technology |
| CN103470041A (en) * | 2013-09-27 | 2013-12-25 | 中铁三局集团有限公司 | Loose sand loading pre-compaction construction method for cast-in-situ concrete beam form steel pipe support |
| CN103470041B (en) * | 2013-09-27 | 2016-05-11 | 中铁三局集团有限公司 | The cast-in-place concrete beam template steel pipe support precompressed construction method that adopts loose sand to load |
| CN105155425A (en) * | 2015-09-22 | 2015-12-16 | 深圳市市政工程总公司 | Fluid analogue simulation preloading construction method of full framing |
| CN107201827A (en) * | 2016-03-16 | 2017-09-26 | 中铁十五局集团有限公司 | Pre-pressing bracket construction method based on settlement observation |
| CN106592437A (en) * | 2016-12-16 | 2017-04-26 | 曹晓滨 | Cast-in-situ construction method for cast-in-situ concrete bridge |
| CN106592437B (en) * | 2016-12-16 | 2018-02-16 | 曹晓滨 | A kind of cast-in-situ construction method of cast-in-place concrete bridge |
| CN109137761A (en) * | 2018-09-29 | 2019-01-04 | 中铁二局集团有限公司 | A method of it controlling existing bridge and to widen bridge settlement poor |
| CN109267488A (en) * | 2018-10-16 | 2019-01-25 | 中铁四局集团有限公司 | A method of utilizing dynamic load precompressed beam sections bridge fabrication machine |
| CN109267488B (en) * | 2018-10-16 | 2020-09-29 | 中铁四局集团有限公司 | Method for preloading segment girder bridge fabrication machine by utilizing dynamic concentrated load |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN110777635A (en) * | 2019-10-31 | 2020-02-11 | 中交路桥华南工程有限公司 | Side arch rib construction method and side arch rib |
| CN111005318A (en) * | 2019-12-03 | 2020-04-14 | 中交路桥华南工程有限公司 | Prepressing method of curved surface support |
| CN111005318B (en) * | 2019-12-03 | 2022-02-11 | 中交路桥华南工程有限公司 | Prepressing method of curved surface support |
| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
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Application publication date: 20121003 |