CN104676110A - On-site overhanging protection method of high-voltage cable bailey truss under condition of excavation of foundation pit - Google Patents

On-site overhanging protection method of high-voltage cable bailey truss under condition of excavation of foundation pit Download PDF

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Publication number
CN104676110A
CN104676110A CN201510040803.4A CN201510040803A CN104676110A CN 104676110 A CN104676110 A CN 104676110A CN 201510040803 A CN201510040803 A CN 201510040803A CN 104676110 A CN104676110 A CN 104676110A
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CN
China
Prior art keywords
steel
cable
excavation
bailey bracket
channel
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Application number
CN201510040803.4A
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Chinese (zh)
Inventor
蔡科
吴立
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中国地质大学(武汉)
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Application filed by 中国地质大学(武汉) filed Critical 中国地质大学(武汉)
Priority to CN201510040803.4A priority Critical patent/CN104676110A/en
Publication of CN104676110A publication Critical patent/CN104676110A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00Installations of electric cables or lines in or on the ground or water
    • H02G9/02Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile

Abstract

The invention discloses an on-site overhanging protection method of a high-voltage cable bailey truss under the condition of excavation of a foundation pit and relates to the technical field of construction. The on-site overhanging protection method includes steps of (1) anchoring an upright of the bailey truss; (2) erecting the bailey truss; (3) excavating locally under a cable; (4) forming an overhanging system; (5) overhanging the cable; (6) demounting an original cable groove; (7) excavating the foundation pit; (8) newly building a cable groove and demounting the overhanging system. The overhanging protection system for all high-voltage cables can be completed before excavation of the foundation pit in the corresponding positions, and during construction of the high-voltage cable overhanging protection system, and relevant staff of the power sector is invited to monitor and guide on the site. Meanwhile, wrapping protection of cables and cable joints is implemented by cooperation with the power sector, and construction safety is sufficiently guaranteed.

Description

A kind of high voltage cable Bailey bracket original place suspension protection method under excavation of foundation pit situation
Technical field
The present invention relates to technical field of buildings, more particularly, the present invention relates to a kind of high voltage cable Bailey bracket original place suspension protection method under excavation of foundation pit situation.
Background technique
Foundation ditch in basic design position by the heatable adobe sleeping platform that substrate absolute altitude and base plane size are excavated.According to geology hydrological data, in conjunction with on-the-spot nearby buildings situation, excavation plan should be determined, and performs water-proof drainage work before excavation.The not dark person of excavation by the way of putting side slope, can make Stability of Earth Slopes, and its gradient size is determined by relevant engineering discipline of executing.The comparatively dark and contiguous person that has building of excavation, available foundation pit walls supporting method, sprayed concrete wall protecting method, Large Foundation Pit even adopts concrete diaphragm wall and the method such as colonnade formula bored pile is chain, protection outside soil layer collapse into.
In construction, according to field condition and power department clarification, the high voltage cable in same court cannot migrate to outside foundation ditch.In this type of situation, power department is requirement often, and this high voltage cable must carry out protect in situ during foundation pit construction, after permanent structure completion, then is migrated in new cable ditch by cable.Run into this type of situation, conventional is build divider wall protection method to high voltage cable guard method at present, and these class methods waste time and energy, high cost, and it is large to take up room, and hinder construction to carry out.
Summary of the invention
Problem to be solved by this invention is to provide a kind of high voltage cable Bailey bracket original place suspension protection method under excavation of foundation pit situation, wastes time and energy to solve existing method, high cost, and the large defect that takes up room.
To achieve these goals, the technological scheme that the present invention takes is: 1, a kind of high voltage cable Bailey bracket original place suspension protection method under excavation of foundation pit situation, is characterized in that, comprise the steps:
(1) Bailey bracket column anchoring section: first press coordinate position construction artificial digging pile at foundation ditch original ground, column anchored end cross section is that the artificial digging pile of φ 1200mm is at the bottom of foundation ditch, be incorporated to the whole hole of strong-weathered rock 5m or middle weathering 3m or gentle breeze 2m, then bury Bailey bracket column underground on stake top;
(2) Bailey bracket structure is set up: bury 2 I 50b I-steel underground on stake top, and set up 2 I 50b I-steel crossbeams, 40b# I-steel girder and 14# channel-section steels, 40b# I-steel girder is connected with 2 I 50b I-steel transom bolts, sets up Bailey bracket girder, Bailey bracket secondary beam, Bailey bracket purlin;
(3) local excavation under cable: segmentation is immediately below channel-section steel bottom local excavation to chase, and soil digging cavitation is got through below chase, and insert 14# channel-section steel support column wire casing in time;
(4) form Suspension System: adopt 20 round steel to be connect by the channel-section steel on bracket and I-steel girder, two ends screw tightens up, form Suspension System;
(5) pendant cables: be shallowly excavated at the bottom of pipeline, limit is manually abolished cable channel central diaphragm and side plate limit and is penetrated sole bar angle, plank etc. in time and hold cable channel central diaphragm corresponding position and manually abolish, and penetrates horizontal angle steel, sole bar angle, plank etc. and holds cable.All steel structure must have reliable ground connection, ground connection ground resistance≤1 ohm;
(6) remove original wire way: system construction to be suspended is complete can be removed former cable tube seat, manual type must be adopted to remove within the scope of distance cable 2m, forbid mechanical removal;
(7) excavation of foundation pit: continue at the bottom of the stage excavation earthwork to foundation ditch, construction basement structure to ground, at steel pile position reserving hole.For guaranteeing the stability of column, reducing the stability influence of earthwork side pressure column, the necessary sectional stage excavation of earth excavation, each section carries out stage excavation by 1.5 meters of degree of depth, each section must cut plane of inclination at 45 ° with excavator at interface, ensures the stability of the section interface soil body;
(8) newly-built cable channel, dismounting Suspension System: lay new tube seat in cable former address, and remove the section steel beam of Suspension System, build reserving hole.
Preferably, the cross section of the Bailey bracket column in described step (1) is 2 I 50b I-steel, buries underground in anchored end top.
Preferably, the Bailey bracket girder in described step (2) is two I 50b I-steel that Bailey bracket column top is laterally set up.
Preferably, the Bailey bracket secondary beam in described step (2) is two 40b# I-steel, and top surface of the beam absolute altitude is-0.17m, and two I-steel spacing are 2.5 ~ 4m, and span is 8.5 ~ 10m.
Preferably, the Bailey bracket purlin in described step (2) is the 14# channel-section steel be laid on two I-steel secondary beams, and through a 14# channel-section steel bottom cable accordingly immediately below this channel-section steel.
Preferably, connect two 14# channel-section steels by Φ 20 round steel in described step (5) and form suspension system, with this pendant cables, channel-section steel longitudinal pitch be 2.5 ~ 4m not etc.; Close paving 4cm thick plank on the 14# channel-section steel of cable bottom, plank both sides ride on the angle steel of L50 × 5, and angle steel is longitudinally laid on channel-section steel along pipeline direction.
Beneficial effect: under excavation of foundation pit situation of the present invention, high voltage cable Bailey bracket original place suspension protection method is 17.5m in the excavation of foundation pit degree of depth, when the high voltage cable length intending protecting former address in foundation ditch reaches 84m, for guaranteeing high voltage cable safety, and adopt Bailey bracket across the suspending type protection scheme of foundation ditch, high voltage cable is protected, the suspension protection system of all high voltage cables of this guard method all must complete before the excavation of foundation pit of relevant position, during high voltage cable suspension protection system construction, also invite power department relevant personnel's field surveillance and guidance, coordinate power department to implement the outsourcing protection of cable and cable joining simultaneously, fully ensure construction safety.This guard method is time saving and energy saving, under cost, and takes up an area less, does not disturb construction.
Embodiment
Embodiment 1:
The method divides eight steps to carry out, first carry out (1) Bailey bracket column anchoring section: first foundation ditch original ground by coordinate position construction artificial digging pile, column anchored end cross section is that the artificial digging pile of φ 1200mm is at the bottom of foundation ditch, be incorporated to the whole hole of strong-weathered rock 5m, then bury Bailey bracket column underground on stake top, (2) Bailey bracket structure is set up: bury 2 I 50b I-steel underground on stake top, and set up 2 I 50b I-steel crossbeams, 40b# I-steel girder and 14# channel-section steel, 40b# I-steel girder is connected with 2 I 50b I-steel transom bolts, set up Bailey bracket girder, Bailey bracket secondary beam, Bailey bracket purlin, Bailey bracket girder is two I50b I-steel that Bailey bracket column top is laterally set up, Bailey bracket secondary beam is two 40b# I-steel, top surface of the beam absolute altitude is-0.17m, article two, I-steel spacing is 2.5m, span is 8.5m, Bailey bracket purlin is the 14# channel-section steel be laid on two I-steel secondary beams, and through a 14# channel-section steel bottom cable accordingly immediately below this channel-section steel, then carry out local excavation under (3) cable: segmentation is immediately below channel-section steel bottom local excavation to chase, and soil digging cavitation is got through below chase, and insert 14# channel-section steel support column wire casing in time, carry out (4) again and form Suspension System: adopt 20 round steel to be connect by the channel-section steel on bracket and I-steel girder, two ends screw tightens up, form Suspension System, carry out (5) pendant cables again: be shallowly excavated at the bottom of pipeline, limit is manually abolished cable channel central diaphragm and side plate limit and is penetrated sole bar angle, plank etc. in time and hold cable channel central diaphragm corresponding position and manually abolish, and penetrates horizontal angle steel, sole bar angle, plank etc. and holds cable.All steel structure must have reliable ground connection, ground connection ground resistance≤1 ohm; Carry out (6) again and remove original wire way: system construction to be suspended is complete can be removed former cable tube seat, manual type must be adopted to remove within the scope of distance cable 2m, forbid mechanical removal; Carry out (7) excavation of foundation pit again: continue at the bottom of the stage excavation earthwork to foundation ditch, construction basement structure to ground, at steel pile position reserving hole.For guaranteeing the stability of column, reducing the stability influence of earthwork side pressure column, the necessary sectional stage excavation of earth excavation, each section carries out stage excavation by 1.5 meters of degree of depth, each section must cut plane of inclination at 45 ° with excavator at interface, ensures the stability of the section interface soil body; Finally carry out (8) newly-built cable channel, remove Suspension System: lay new tube seat in cable former address, and remove the section steel beam of Suspension System, build reserving hole.
Embodiment 2:
Embodiment 1 is repeated by described same steps, difference is: step (1) Bailey bracket column anchoring section: be incorporated to the whole hole of middle decomposed rock 3m, then Bailey bracket column is buried underground on stake top, step (2) sets up Bailey bracket structure: Bailey bracket secondary beam is two 40b# I-steel, top surface of the beam absolute altitude is-0.17m, article two, I-steel spacing is 3m, and span is 9m.
Embodiment 3:
Embodiment 1 is repeated by described same steps, difference is: step (1) Bailey bracket column anchoring section: be incorporated to the whole hole of micro-decomposed rock 2m, then Bailey bracket column is buried underground on stake top, step (2) sets up Bailey bracket structure: Bailey bracket secondary beam is two 40b# I-steel, top surface of the beam absolute altitude is-0.17m, article two, I-steel spacing is 4m, and span is 10m.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (6)

1. a high voltage cable Bailey bracket original place suspension protection method under excavation of foundation pit situation, is characterized in that, comprise the steps:
(1) Bailey bracket column anchoring section: first press coordinate position construction artificial digging pile at foundation ditch original ground, column anchored end cross section is that the artificial digging pile of φ 1200mm is at the bottom of foundation ditch, be incorporated to the whole hole of strong-weathered rock 5m or middle weathering 3m or gentle breeze 2m, then bury Bailey bracket column underground on stake top;
(2) Bailey bracket structure is set up: bury 2 I 50b I-steel underground on stake top, and set up 2 I 50b I-steel crossbeams, 40b# I-steel girder and 14# channel-section steels, 40b# I-steel girder is connected with 2 I 50b I-steel transom bolts, sets up Bailey bracket girder, Bailey bracket secondary beam, Bailey bracket purlin;
(3) local excavation under cable: segmentation is immediately below channel-section steel bottom local excavation to chase, and soil digging cavitation is got through below chase, and insert 14# channel-section steel support column wire casing in time;
(4) form Suspension System: adopt 20 round steel to be connect by the channel-section steel on bracket and I-steel girder, two ends screw tightens up, form Suspension System;
(5) pendant cables: be shallowly excavated at the bottom of pipeline, limit is manually abolished cable channel central diaphragm and side plate limit and is penetrated sole bar angle, plank etc. in time and hold cable channel central diaphragm corresponding position and manually abolish, and penetrates horizontal angle steel, sole bar angle, plank etc. and holds cable.All steel structure must have reliable ground connection, ground connection ground resistance≤1 ohm;
(6) remove original wire way: system construction to be suspended is complete can be removed former cable tube seat, manual type must be adopted to remove within the scope of distance cable 2m, forbid mechanical removal;
(7) excavation of foundation pit: continue at the bottom of the stage excavation earthwork to foundation ditch, construction basement structure to ground, at steel pile position reserving hole.For guaranteeing the stability of column, reducing the stability influence of earthwork side pressure column, the necessary sectional stage excavation of earth excavation, each section carries out stage excavation by 1.5 meters of degree of depth, each section must cut plane of inclination at 45 ° with excavator at interface, ensures the stability of the section interface soil body;
(8) newly-built cable channel, dismounting Suspension System: lay new tube seat in cable former address, and remove the section steel beam of Suspension System, build reserving hole.
2. according to high voltage cable Bailey bracket original place suspension protection method under a kind of excavation of foundation pit situation according to claim 1, it is characterized in that: the cross section of the Bailey bracket column in described step (1) is 2 I 50b I-steel, buries underground in anchored end top.
3. according to high voltage cable Bailey bracket original place suspension protection method under a kind of excavation of foundation pit situation according to claim 1, it is characterized in that: the Bailey bracket girder in described step (2) is two I 50b I-steel that Bailey bracket column top is laterally set up.
4. according to high voltage cable Bailey bracket original place suspension protection method under a kind of excavation of foundation pit situation according to claim 1; it is characterized in that: the Bailey bracket secondary beam in described step (2) is two 40b# I-steel; top surface of the beam absolute altitude is-0.17m; article two, I-steel spacing is 2.5 ~ 4m, and span is 8.5 ~ 10m.
5. according to high voltage cable Bailey bracket original place suspension protection method under a kind of excavation of foundation pit situation according to claim 1; it is characterized in that: the Bailey bracket purlin in described step (2) is the 14# channel-section steel be laid on two I-steel secondary beams, and through a 14# channel-section steel bottom cable accordingly immediately below this channel-section steel.
6. according to high voltage cable Bailey bracket original place suspension protection method under a kind of excavation of foundation pit situation according to claim 1, it is characterized in that: connect two 14# channel-section steels by Φ 20 round steel in described step (5) and form suspension system, with this pendant cables, channel-section steel longitudinal pitch be 2.5 ~ 4m not etc.; Close paving 4cm thick plank on the 14# channel-section steel of cable bottom, plank both sides ride on the angle steel of L50 × 5, and angle steel is longitudinally laid on channel-section steel along pipeline direction.
CN201510040803.4A 2015-01-22 2015-01-22 On-site overhanging protection method of high-voltage cable bailey truss under condition of excavation of foundation pit CN104676110A (en)

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
CN105546278A (en) * 2015-12-23 2016-05-04 国家电网公司 Method for protecting underground pipeline during pipe ditch excavation
CN105570539A (en) * 2015-12-21 2016-05-11 广州机施建设集团有限公司 Construction method of pipeline protection structure
CN105604064A (en) * 2015-12-21 2016-05-25 广州机施建设集团有限公司 Construction method of comprehensive pipeline protection system supporting system
CN105782576A (en) * 2016-04-21 2016-07-20 中铁建大桥工程局集团第四工程有限公司 Temporary pipeline lower hoisting bracket and trench excavating pipeline protection method
CN107587528A (en) * 2017-08-27 2018-01-16 中铁二十四局集团有限公司 It is a kind of to protect the design and construction method across the underground high voltage cable box culvert of foundation ditch
CN107653787A (en) * 2017-08-27 2018-02-02 中铁二十四局集团有限公司 It is a kind of to protect the construction method across the underground high voltage cable box culvert of foundation ditch
CN108895203A (en) * 2018-06-21 2018-11-27 中国十七冶集团有限公司 A kind of pipeline mounting structures and its construction method for across pipe gallery
CN109577667A (en) * 2018-05-02 2019-04-05 国网福建省电力有限公司厦门供电公司 A kind of high-tension cable electricity well original position suspension protection method
CN109653244A (en) * 2018-11-21 2019-04-19 中铁十八局集团有限公司 Intersect the Bailey truss system and its construction method of protection applied to complicated tube cable
CN109654294A (en) * 2018-11-21 2019-04-19 中铁十八局集团有限公司 A kind of integrated protection system and its construction method applied to intersection complex grid
CN110445077A (en) * 2018-05-02 2019-11-12 国网福建省电力有限公司厦门供电公司 A kind of high-tension cable power channel original position suspension protection method
CN110593268A (en) * 2018-06-12 2019-12-20 中铁十八局集团有限公司 Underground pipeline excavation construction technology based on support piles and bailey frames for protection
CN111021363A (en) * 2019-12-31 2020-04-17 广东顺德电力设计院有限公司 Method and system for protecting cable by using bailey truss
CN111173027A (en) * 2019-12-25 2020-05-19 北京正和恒基滨水生态环境治理股份有限公司 Construction method for reinforcing and protecting existing pipeline

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105570539A (en) * 2015-12-21 2016-05-11 广州机施建设集团有限公司 Construction method of pipeline protection structure
CN105604064A (en) * 2015-12-21 2016-05-25 广州机施建设集团有限公司 Construction method of comprehensive pipeline protection system supporting system
CN105570539B (en) * 2015-12-21 2018-03-20 广州机施建设集团有限公司 The construction method of pipeline protection structure
CN105546278A (en) * 2015-12-23 2016-05-04 国家电网公司 Method for protecting underground pipeline during pipe ditch excavation
CN105782576A (en) * 2016-04-21 2016-07-20 中铁建大桥工程局集团第四工程有限公司 Temporary pipeline lower hoisting bracket and trench excavating pipeline protection method
CN105782576B (en) * 2016-04-21 2018-01-16 中铁建大桥工程局集团第四工程有限公司 Fluted tube line guard method is excavated below interim pipeline
CN107587528A (en) * 2017-08-27 2018-01-16 中铁二十四局集团有限公司 It is a kind of to protect the design and construction method across the underground high voltage cable box culvert of foundation ditch
CN107653787A (en) * 2017-08-27 2018-02-02 中铁二十四局集团有限公司 It is a kind of to protect the construction method across the underground high voltage cable box culvert of foundation ditch
CN107653787B (en) * 2017-08-27 2019-07-26 中铁二十四局集团有限公司 It is a kind of to protect the construction method across the underground high voltage cable box culvert of foundation pit
CN107587528B (en) * 2017-08-27 2019-04-12 中铁二十四局集团有限公司 It is a kind of to protect the design and construction method across the underground high voltage cable box culvert of foundation pit
CN109577667A (en) * 2018-05-02 2019-04-05 国网福建省电力有限公司厦门供电公司 A kind of high-tension cable electricity well original position suspension protection method
CN110445077A (en) * 2018-05-02 2019-11-12 国网福建省电力有限公司厦门供电公司 A kind of high-tension cable power channel original position suspension protection method
CN110593268A (en) * 2018-06-12 2019-12-20 中铁十八局集团有限公司 Underground pipeline excavation construction technology based on support piles and bailey frames for protection
CN108895203A (en) * 2018-06-21 2018-11-27 中国十七冶集团有限公司 A kind of pipeline mounting structures and its construction method for across pipe gallery
CN109654294A (en) * 2018-11-21 2019-04-19 中铁十八局集团有限公司 A kind of integrated protection system and its construction method applied to intersection complex grid
CN109654294B (en) * 2018-11-21 2019-10-08 中铁十八局集团有限公司 A kind of integrated protection system and its construction method applied to intersection complex grid
CN109653244B (en) * 2018-11-21 2019-10-22 中铁十八局集团有限公司 Intersect the Bailey truss system and its construction method of protection applied to complicated tube cable
CN109653244A (en) * 2018-11-21 2019-04-19 中铁十八局集团有限公司 Intersect the Bailey truss system and its construction method of protection applied to complicated tube cable
WO2020103351A1 (en) * 2018-11-21 2020-05-28 中铁十八局集团有限公司 Bailey support system applied to crossed protection of complicated pipe cable and construction method therefor
CN111173027A (en) * 2019-12-25 2020-05-19 北京正和恒基滨水生态环境治理股份有限公司 Construction method for reinforcing and protecting existing pipeline
CN111021363A (en) * 2019-12-31 2020-04-17 广东顺德电力设计院有限公司 Method and system for protecting cable by using bailey truss

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Application publication date: 20150603