CN101446088A - Construction method for pole and tower foundation in Gobi Desert gravelly soil area - Google Patents
Construction method for pole and tower foundation in Gobi Desert gravelly soil area Download PDFInfo
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- CN101446088A CN101446088A CNA2008102264460A CN200810226446A CN101446088A CN 101446088 A CN101446088 A CN 101446088A CN A2008102264460 A CNA2008102264460 A CN A2008102264460A CN 200810226446 A CN200810226446 A CN 200810226446A CN 101446088 A CN101446088 A CN 101446088A
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Abstract
The invention discloses a construction method for pole and tower foundation in a Gobi Desert gravelly soil area, comprising the following steps: preparing for construction, excavating foundation ditch, assembling reinforcement, putting up formwork, casting concrete, stripping formwork, maintaining, clearing site and inspecting quality. The method of the invention has obvious economic advantage and less damage to natural resources.
Description
Technical field
The present invention relates to a kind of pole and tower foundation job practices that is used for Gobi desert gravelly soil area, belong to the electric power line pole tower basic field.
Background technology
The area, Gobi desert be the NORTHWEST CHINA area more special, have a very strong zonal class one zone territory.The geology characteristic in Gobi desert area is: through long-term exposing to the weather, and excessive vaporization, the face of land a lot of gravels that distribute; And below the face of land, soil layer is better glued, and soil body independence is stronger, and groundwater table is very low.To the research on this type of regional electric power line pole tower basis, the both at home and abroad not test data of system and research data as yet.The main board-like basis of steel concrete (heavy excavation flexible foundation) of adopting, electric power line pole tower basis in the actual in the past engineering, this basis is to the extremely well-adapted of geological conditions and basic role power, but applied range, but fail to make full use of the good shearing resistance overturning or slip resistance analysis performance of Gobi desert area undisturbed soil, consumption of materials is bigger, worst is that foundation ditch draws that to dig workload big, the ratio of earth excavation and base concrete side's amount causes bigger destruction for the fragile originally water and soil environment in the Northwest up to 6～12; On the other hand, foundation ditch is drawn the soil property of digging can not adapt to the backfill requirement well, causes the part excavation to abandon, and must arrive transportation plain soil in place far away separately; Moreover, operation along with the 750kV of the Northwest common-tower double-return compact type work transmission line, the active force of pole and tower foundation is increasing, requirement to pole and tower foundation is more and more higher, traditional " the heavy method of soil " is not enough to the basic role power that can provide enough, so just can only continue to increase the size of the board-like flexible foundation of heavy excavation, do not meet " amphitypy three is new " (resource-conserving, environmentally friendly of State Grid Corporation of China, new technology, new material, new technology) demand for development, this has just proposed new requirements at the higher level to the basic type selecting of Gobi desert area transmission line of electricity.
Draw entirely dig the undisturbed soil basis to be applicable to groundwater table not high mould firmly, the fat clay geological conditions, in severely-weathered ground basement rock, also can adopt the digging foundation pattern.It has made full use of undisturbed soil bearing capacity height, the little advantage of distortion, avoided heavy excavation in the work progress, reduced, avoided undue disturbance undisturbed soil to environment damage, undisturbed soil angle of internal friction and cohesive strength are given full play to, thereby increased substantially basic resistance to plucking ability.In addition, digging foundation earthwork evacuation amount is little, spoir is few, does not have the unnecessary earthwork to need to handle basically; During foundation construction " with native Dai Mo ", directly with the cage of reinforcement on basis and concreting in drawing the native tire of the type of scraping out, reduce operating expenses, shown high economic benefit and environmental benefit, in the electric power line pole tower basis, be widely used.
Yet, at Gobi desert area gravelly soil ground, can adopt full digging foundation actually, whether its construction technology feasible? digging foundation for the Northwest's Gobi desert and so on geological conditions, existing rules " aerial power transmission line basic engineering technology Guiding " (DL/T 5219-2005) do not provide the value of the geologic parameter that adapts with it, the domestic test data that does not yet have this type of basic aspect.
Summary of the invention
The present invention has proposed a kind of pole and tower foundation job practices that can be used for Gobi desert gravelly soil area for the first time, may further comprise the steps: preparation of construction, foundation ditch are drawn and are dug, assembling reinforcement and formwork, fluid concrete, form removal, maintenance, site clearing and inspection of quality.Its construction operation flow process as shown in Figure 1.
A kind of pole and tower foundation job practices that is used for Gobi desert gravelly soil area of the present invention, it is characterized in that may further comprise the steps: preparation of construction, foundation ditch are drawn and are dug, assembling reinforcement and formwork, fluid concrete, form removal, maintenance, site clearing and inspection of quality, it is characterized in that described foundation ditch is drawn to dig may further comprise the steps:
(1) strict size by the drawing regulation is drawn and is dug foundation ditch;
(2) draw according to foundation ditch and dig size and dig out open test pit earlier, the degree of depth is 100-600mm, answers repetition measurement to take measurements after open test pit digs, and continues excavation after adhering to specification again;
(3) foundation ditch is drawn in the process of digging control hole wall size, and the degree of depth is whenever dug 50mm and will be hung and once cheat the center, and whether measure the hole wall vertical;
(4) foundation ditch draw dig finish after, use transit, Sopwith staff foundation ditch to be grasped flat, centering, and check each size;
The step of described assembling reinforcement and formwork comprises: on-the-spot colligation steel bar stress in drawing the foundation ditch of the type of scraping out, formwork comprise that the locating template with stone bolt of building of digging foundation concrete bearing platform carries out template and supports;
Described form removal, the step of maintenance and site clearing comprises: carry out basic maintenance after the foundation ditch cast finishes, be not less than 2.5MPa at concrete strength, and under the situation that assurance concrete surface and corner angle do not damage, form removal is carried out on the basis, during form removal from top to bottom, the delivery applications rope, stack in the template set of pulling down, after the form removal of basis, in time surface of base is carried out the presentation quality inspection, qualified on inspection back wraps column with plastic sheeting carries out maintenance, after pouring into a mould, foundation ditch promptly covers, begin water seasoning in 12 hours, should add overcover at foundation forms during maintenance, the water seasoning time is no less than 5 round the clock.
The cubic metre of earth and stone that described foundation ditch is drawn in the process of digging should be cast foundation ditch pit edge 1m place in addition aside, and reliable safeguard procedures are set.
Described after concreting finishes, with straw bag the basis is covered immediately, prevent dry and crackedly, after the basis is cast and finished, accompany a circle clay on opening part template limit, foundation ditch upper end, and compacting, prevent that rainwater from deeply cheating wall.
Adopt method of the present invention when excavation soil property situation is relatively poor, adopt the measure of concrete guard wall, just carry out the retaining wall operation during the every 0.3-0.8 rice of cutting depth, treat that breast wall concrete reaches the foundation ditch that carries out next section after the certain intensity again and draws and dig.The present invention has following advantage:
Traditional in the work transmission line of Gobi desert gravelly soil stratum, the Northwest; pole and tower foundation mainly is to adopt the board-like basis of steel concrete; comprise footing foundation and board-like right cylinder basis; this basis is to the extremely well-adapted of geological conditions and basic role power; but applied range; but it fails to make full use of the good shearing resistance overturning or slip resistance analysis performance of Gobi desert area undisturbed soil; material consumption is bigger; worst is that foundation ditch draws that to dig workload big; cause bigger destruction for the water and soil environment, particularly environment in recent years protection with a very important position in work transmission line is built.
Than footing foundation and board-like straight column type basis, full digging foundation all has tangible economic advantages; Requirement for the big load in 750kV common-tower double-return compact type electric power line pole tower basis relies on the footing foundation operating expenses of self gravitation the highest merely, the economic operation cost maximum, and this type of basic pattern is not adopted in suggestion; Full digging foundation is compared with more board-like straight column type basis, and concrete amount saves 35%, and rolled steel dosage is saved more than 50%, and the construction total cost is saved more than 30%, has good and economic.
From the environmental protection angle, the construction operation face of full digging foundation is less, and is very little to the destructiveness of natural resource; And footing foundation or board-like straight column type basis need the backfill of better quality requirement simultaneously owing to the bigger construction operation face of the bigger needs of self size, and it destroys more serious to the fragile natural resource in Gobi desert area, be unfavorable for requirement on environmental protection.
Description of drawings
Fig. 1 is according to the full digging foundation foundation pit construction flow chart in Gobi desert rubble of the present invention area;
Fig. 2 is a schematic diagram of drawing the foundation ditch shape of digging according to method of the present invention.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
1, preparation of construction
Mainly comprise conventional preparation project, the preparation of for example construction technology preparation, raw material preparation and construction appliance etc.
2, foundation ditch is drawn and is dug
It is as follows that the foundation ditch of full digging foundation is drawn the process of digging:
1. digging foundation should strict press the size excavation on the drawing, stable with the soil that maintains the original state, forbid conveniently arbitrarily strengthening cross section diameter in order to cut the earth and the hole dark, and cause the increase of amount of concrete and the destruction of undisturbed soil;
2. to adopt the hand excavation be main for digging foundation construction, draws according to foundation ditch and dig size and dig out open test pit earlier, and the about 300mm of the degree of depth answers the repetition measurement size after open test pit digs, can continue after adhering to specification to excavate again;
3. when excavation soil property situation was relatively poor, foundation ditch was drawn to dig and is difficult to moulding, must adopt safety measures such as concrete guard wall, prevents that the earthwork is caved in the digging process, guarantees to cheat down safety work, guarantees that construction safety carries out smoothly; Take the basic foundation ditch of retaining wall mode to draw when digging, just should carry out retaining wall during the every 0.5-0.8 rice of cutting depth, treat that breast wall concrete reaches the foundation ditch that carries out next section after the certain intensity again and draws and dig.
4. draw the shape that scrapes out the hole and directly have influence on workmanship and the concrete side of casting amount, therefore, foundation ditch is drawn and is wanted duty to measure inspection in the process of digging, and is lost shape in the position, hole, controls well and cheats the wall size, whenever digs 500mm and will hang the center of once cheating deeply.
If can not enter next procedure construction after 5. foundation ditch is drawn and dug at once, draw and dig body portion and should temporarily not draw and dig, treat basic formwork before, draw again and dig with smooth;
6. after foundation ditch has dug, must grasp flat, centering to foundation ditch, and check each size with transit, Sopwith staff.
Foundation ditch draw in the process of digging should points for attention:
1. because the on-the-spot dust storm in Gobi desert area is big, foundation ditch is drawn the cubic metre of earth and stone in the process of digging should cast foundation ditch pit edge 1m (full digging foundation must cast aside the end, hole draw dig part edge 1m) aside in addition, and reliable safeguard procedures are arranged, to prevent causing the personal safety accident in the spoir landing foundation ditch;
2. basic hole moulding is adopted manually to draw and is dug, and should take the necessary security measure, and particularly reaming part will someone be guarded on the hole, and personnel take care in the hole, and the site operation personnel must all correctly wear safety helmet; The field operation personnel must not have a rest in the hole;
3. the hole is dark lays ladder so that up and down above 1.5m is appropriate to the occasion, prevents that mainly the constructor from trampling hole wall rubble in the foundation ditch process up and down, causes hole wall rubble unstability to come off, and influences the size of full digging foundation moulding;
4. draw in the process of digging at foundation ditch, if run into the rainy day, drainage will be carried out in the end, hole, must not ponding, and be shaped to the basis at foundation ditch and build during this period of time, must above near coal-mine, build rainproof tarpaulin, excavated draining trench around near coal-mine, prevented that the immersion of foundation ditch rainwater from causing landslide.
The foundation ditch of the full digging foundation of Gobi desert area gravelly soil is drawn the process of digging and is seen shown in Figure 2.
3, assembling reinforcement and formwork
Assembling reinforcement mainly refers to on-the-spot colligation steel bar stress in drawing the foundation ditch of the type of scraping out, and formwork is primarily aimed at the locating template with stone bolt of building of digging foundation concrete bearing platform.
4, concreting
The work progress of concreting is as follows: 1. filler in proper order: water-cement-sand-stone.2. the basis is built and will be carried out continuously, must not be interrupted, and be interrupted for some reason above after 2 hours the centre, must not continue to build, must treat that concrete crushing strength reaches after the 1.18MPa, will be interrupted the contact surface hacking, clean, water one deck and concrete cement mortar earlier, and then continue to build with sample ingredient.3. build finish after, with straw bag the basis is covered immediately, prevent dry and cracked.
The measure that prevents voids and pits in the work progress of concreting is as follows: 1. stone reduces 15% in the concrete of intersection, suitably increases cement and prolongs mixing time, to improve concrete workability; 2. the intersection adopts artificial spade reinforced, and personnel go into mould and make firm by ramming, and the outside builds up domaticly in template, continues normally to build again; 3. remove the unnecessary concrete of outer side slope after the upper strata is built and finished again, vibrator is not crossed shake, is leaked and smash; 4. after the basis is cast and finished, require the Bottle-mouth die edges of boards to accompany a circle clay, and compacting, prevent that rainwater from deeply cheating wall; 5. basic end face does not allow quadric-plastering, waters the back 30～40 minutes, and it is flat end face should to be received slurry, troweling, behaviour.
5, form removal, maintenance, site clearing
The basis should be carried out in accordance with regulations basic maintenance after casting end, is not less than 2.5MPa at concrete strength, and guarantees under the situation that concrete surface and corner angle do not damage form removal to be carried out on the basis; Should forbid to prize firmly, pound firmly or hard draw from top to bottom during form removal, the delivery applications rope, the template of pulling down should be concentrated stacking; After the form removal of basis, should in time carry out the presentation quality inspection to surface of base, qualified on inspection back wraps column with plastic sheeting carries out maintenance.
Promptly cover after water on the basis, begin water seasoning in 12 hours,, when drying has wind, should in 3 hours, carry out water seasoning, should add overcover at foundation forms during maintenance when the weather sweltering heat; The number of times that waters is with moistening being advisable of frequent maintenance concrete surface, and the water seasoning time is no less than 5 round the clock; As weather cold (temperature is lower than 5 ℃), anti-frost protection is carried out on the reply basis.
Patent of the present invention is at Gobi desert gravelly soil stratum, the Northwest, first full digging foundation is successfully applied in the 750kV common-tower double-return compact type work transmission line pole and tower foundation, and successfully carried out the research of component on site construction method in area, Jiuquan, northwest, form the complete construction technology method standard of a cover, can in the 750kV of the Northwest common-tower double-return compact type work transmission line, obtain application.
The present invention has been described according to preferred embodiment.Obviously, reading and understanding above-mentioned detailed description postscript and can make multiple correction and replacement.What this invention is intended to is that the application is built into all these corrections and the replacement that has comprised within the scope that falls into the appended claims or its equivalent.
Claims (4)
1, a kind of pole and tower foundation job practices that is used for Gobi desert gravelly soil area, it is characterized in that may further comprise the steps: preparation of construction, foundation ditch are drawn and are dug, assembling reinforcement and formwork, fluid concrete, form removal, maintenance, site clearing and inspection of quality, it is characterized in that described foundation ditch is drawn to dig may further comprise the steps:
(1) strict size by the drawing regulation is drawn and is dug foundation ditch;
(2) draw according to foundation ditch and dig size and dig out open test pit earlier, the degree of depth is 100-600mm, answers repetition measurement to take measurements after open test pit digs, and continues excavation after adhering to specification again;
(3) foundation ditch is drawn in the process of digging control hole wall size, and the degree of depth is whenever dug 50mm and will be hung and once cheat the center, and whether measure the hole wall vertical;
(4) foundation ditch draw dig finish after, use transit, Sopwith staff foundation ditch to be grasped flat, centering, and check each size;
The step of described assembling reinforcement and formwork comprises: on-the-spot colligation steel bar stress in drawing the foundation ditch of the type of scraping out, formwork comprise that the locating template with stone bolt of building of digging foundation concrete bearing platform carries out template and supports;
Described form removal, the step of maintenance and site clearing comprises: carry out basic maintenance after the foundation ditch cast finishes, be not less than 2.5MPa at concrete strength, and under the situation that assurance concrete surface and corner angle do not damage, form removal is carried out on the basis, during form removal from top to bottom, the delivery applications rope, stack in the template set of pulling down, after the form removal of basis, in time surface of base is carried out the presentation quality inspection, qualified on inspection back wraps column with plastic sheeting carries out maintenance, after pouring into a mould, foundation ditch promptly covers, begin water seasoning in 12 hours, should add overcover at foundation forms during maintenance, the water seasoning time is no less than 5 round the clock.
2, the cubic metre of earth and stone that the method for claim 1, described foundation ditch are drawn in the process of digging should be cast foundation ditch pit edge 1m place in addition aside, and reliable safeguard procedures are set.
3, as the described method of claim 1-2, described after concreting finishes, with straw bag the basis is covered immediately, prevent dry and crackedly, after the basis is cast and finished, accompany a circle clay on opening part template limit, foundation ditch upper end, and compacting, prevent that rainwater from deeply cheating wall.
4, as the described method of claim 1-3, when excavation soil property situation is relatively poor, adopt the measure of concrete guard wall, just carry out the retaining wall operation during the every 0.3-0.8 rice of cutting depth, treat that breast wall concrete reaches the foundation ditch that carries out next section after the certain intensity again and draws and dig.
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| CN2008102264460A CN101446088B (en) | 2008-11-11 | 2008-11-11 | Construction method for pole and tower foundation in Gobi Desert gravelly soil area |
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| CN2008102264460A CN101446088B (en) | 2008-11-11 | 2008-11-11 | Construction method for pole and tower foundation in Gobi Desert gravelly soil area |
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| CN101446088A true CN101446088A (en) | 2009-06-03 |
| CN101446088B CN101446088B (en) | 2012-03-28 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304926A (en) * | 2011-07-07 | 2012-01-04 | 新疆电力公司哈密电业局 | Method for fixing telegraph pole on wetland |
| CN102817380A (en) * | 2012-02-20 | 2012-12-12 | 中国科学院寒区旱区环境与工程研究所 | Measure for enhancing electric transmission line tower footing frozen soil foundation stability |
| CN104988941A (en) * | 2015-05-21 | 2015-10-21 | 中国化学工程第三建设有限公司 | Large bearing platform type foundation hanging formwork and construction method thereof |
| CN105556039A (en) * | 2013-09-26 | 2016-05-04 | 波马公司 | Anchoring device and method |
| CN107476327A (en) * | 2017-08-31 | 2017-12-15 | 中国电建集团河南工程公司 | Narrow base list column step foundation construction method |
| CN108104150A (en) * | 2017-11-30 | 2018-06-01 | 中国电力科学研究院有限公司 | Transmission tower cast-in-situ reinforced concrete hollow borehole class basis and its construction method |
| CN108343082A (en) * | 2018-02-27 | 2018-07-31 | 国网山东省电力公司泗水县供电公司 | A kind of foundation construction method of high pressure shaft tower |
| CN108647387A (en) * | 2018-04-08 | 2018-10-12 | 中国电建集团河北省电力勘测设计研究院有限公司 | A kind of UHV transmission line Digitized Structure design method |
| CN110080275A (en) * | 2019-05-17 | 2019-08-02 | 河南海鹏送变电工程有限公司 | A kind of power transmission and transformation line installation base construction method |
| CN113529778A (en) * | 2021-07-20 | 2021-10-22 | 中铁三局集团有限公司 | Construction method for foundation of electric power iron tower in plateau area |
| CN114250778A (en) * | 2020-09-23 | 2022-03-29 | 国网山西电力勘测设计研究院有限公司 | Method for anchoring middle anti-pulling ring electric tower foundation pit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304926B (en) * | 2011-07-07 | 2013-04-03 | 新疆电力公司哈密电业局 | Method for fixing telegraph pole on wetland |
| CN102304926A (en) * | 2011-07-07 | 2012-01-04 | 新疆电力公司哈密电业局 | Method for fixing telegraph pole on wetland |
| CN102817380A (en) * | 2012-02-20 | 2012-12-12 | 中国科学院寒区旱区环境与工程研究所 | Measure for enhancing electric transmission line tower footing frozen soil foundation stability |
| CN102817380B (en) * | 2012-02-20 | 2015-03-11 | 中国科学院寒区旱区环境与工程研究所 | Measure for enhancing electric transmission line tower footing frozen soil foundation stability |
| CN105556039B (en) * | 2013-09-26 | 2018-07-10 | 波马公司 | anchoring device and method |
| CN105556039A (en) * | 2013-09-26 | 2016-05-04 | 波马公司 | Anchoring device and method |
| CN104988941A (en) * | 2015-05-21 | 2015-10-21 | 中国化学工程第三建设有限公司 | Large bearing platform type foundation hanging formwork and construction method thereof |
| CN104988941B (en) * | 2015-05-21 | 2017-02-22 | 中国化学工程第三建设有限公司 | Large bearing platform type foundation hanging formwork and construction method thereof |
| CN107476327B (en) * | 2017-08-31 | 2019-06-28 | 中国电建集团河南工程有限公司 | Narrow base list column step foundation construction method |
| CN107476327A (en) * | 2017-08-31 | 2017-12-15 | 中国电建集团河南工程公司 | Narrow base list column step foundation construction method |
| CN108104150A (en) * | 2017-11-30 | 2018-06-01 | 中国电力科学研究院有限公司 | Transmission tower cast-in-situ reinforced concrete hollow borehole class basis and its construction method |
| CN108343082A (en) * | 2018-02-27 | 2018-07-31 | 国网山东省电力公司泗水县供电公司 | A kind of foundation construction method of high pressure shaft tower |
| CN108647387A (en) * | 2018-04-08 | 2018-10-12 | 中国电建集团河北省电力勘测设计研究院有限公司 | A kind of UHV transmission line Digitized Structure design method |
| CN110080275A (en) * | 2019-05-17 | 2019-08-02 | 河南海鹏送变电工程有限公司 | A kind of power transmission and transformation line installation base construction method |
| CN114250778A (en) * | 2020-09-23 | 2022-03-29 | 国网山西电力勘测设计研究院有限公司 | Method for anchoring middle anti-pulling ring electric tower foundation pit |
| CN113529778A (en) * | 2021-07-20 | 2021-10-22 | 中铁三局集团有限公司 | Construction method for foundation of electric power iron tower in plateau area |
| CN114457838A (en) * | 2022-02-28 | 2022-05-10 | 北京城建集团有限责任公司 | Construction scheme for cableway foundation |
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| Publication number | Publication date |
|---|---|
| CN101446088B (en) | 2012-03-28 |
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