CN102587407A - Construction method for tower crane foundation without bearing platform in deep foundation pit - Google Patents

Construction method for tower crane foundation without bearing platform in deep foundation pit Download PDF

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Publication number
CN102587407A
CN102587407A CN2012100816542A CN201210081654A CN102587407A CN 102587407 A CN102587407 A CN 102587407A CN 2012100816542 A CN2012100816542 A CN 2012100816542A CN 201210081654 A CN201210081654 A CN 201210081654A CN 102587407 A CN102587407 A CN 102587407A
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CN
China
Prior art keywords
steel
tower crane
lattice column
welding
lattice
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CN2012100816542A
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Chinese (zh)
Inventor
李迥
陈炎表
徐光新
余舟平
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舜元建设(集团)有限公司
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Priority to CN2012100816542A priority Critical patent/CN102587407A/en
Publication of CN102587407A publication Critical patent/CN102587407A/en

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Abstract

The invention discloses a construction method for a tower crane foundation without a bearing platform in a deep foundation pit. The construction method comprises the following steps: selecting four cast-in-situ bored piles, and inserting a steel lattice column into the upper part of each cast-in-situ bored pile during cast-in-situ bored pile construction; horizontally cutting a redundant part at the top of each lattice column when concrete strength of the cast-in-situ bored piles reaches over 70% of designed strength, and ensuring that the machine ends of the lattice columns are in a same horizontal plane after cutting; additionally arranging a horizontal steel plate on the top of each lattice column, positioning the steel plates before the steel plates are welded so as to ensure that bolt holes are positioned in the central positions of the lattice columns, and carrying out welding connection between each steel plate and each lattice column on site after the bolt hole is positioned and drilled; and installing a tower crane after the steel plates at the tops of the lattice columns are welded, and additionally arranging welding shears supports among the lattice columns so as to enhance whole rigidity of the steel lattice columns. The method completely adopts steel structure technology to realize transition connection between a tower crane standard node and a cast-in-situ bored pile, so as to avoid the impact of the adoption of a concrete bearing platform in transition on structure construction, and save construction cost.

Description

No cushion cap tower crane job practices in a kind of deep foundation ditch
Technical field
The present invention relates to the job practices of the interior tower crane of deep foundation ditch of technical field of building construction, specifically, what relate to is no cushion cap hole tower crane job practices in a kind of deep foundation ditch.
Background technology
Pillar crane is called for short the tower machine, also claims tower crane, originates from West Europe.According to record, first relevant tower machine patent for building issued in 1900.Occurred the fixing crane that jib is housed of body of the tower in 1905, nineteen twenty-three has been processed the prototype machine of tower machine in modern age, the same year occurs first more complete tower machine in modern age.Nineteen thirty at that time Germany begun to produce the tower machine in batches, and be used for building operations.The tower machine industry of China begins starting the 1950's, because the tower machine industry that the builing industry weakness causes depressed, the tower machine of China already is in developing period rapidly with respect to the middle Western European countries.From last century the mid-80 so far, the tower machine manufacturing industry of China has had bigger leaping on the whole.
Along with building develops in depth; Increasing large-scale deep-foundation pit engineering appears in the realm of building construction; Tower crane is the important tool of construction site vertical and horizontal transportation; If tower crane is in the deep foundation ditch; Construction had both brought benefit also to bring disadvantageous one side to deep-foundation pit engineering, and how to greatest extent performance is hung in the effect in the deep-foundation pit engineering construction, and the contradiction that how to solve interior tower crane security reliability of large-scale deep foundation ditch and cost control is put day by day in face of the construction engineering teacher.
At present in the deep foundation ditch job practices of tower crane nothing more than following three kinds of ways:
(1) do not establish pile foundation, utilize basement bottom board to make the local arrangement of reinforcement that suitably increases, tower crane is directly installed on the garage base plate.This tower crane construction is general and the basement bottom board construction is synchronous, and tower crane can not come into operation when deep foundation pit supporting structure and sole plate construction, and the tower crane service efficiency is low, is used hardly.
(2) adopt pile foundation just tower crane is set directly at before the basement bottom board construction basement bottom board below (seeing " Shanxi architecture " 2009 the 15th phase Li Chang one-tenth " sunk type tower crane job practices ").There are following two problems in this tower crane way, and first tower crane is constructed separately, need take the measure of going along with sb. to guard him when carrying out soil excavation for the deep-foundation pit engineering tower crane, and little deep foundation pit construction safety is low, and cost is higher relatively; It two is that tower crane is in below the basement sole plate, and underground chamber base base plate construction quality is caused certain influence.Thereby generally do not adopt this method to carry out tower crane for deep-foundation pit engineering and construct.
(3) adopt bored pile tip cutting steel lattice column as transition segment in the hole, build the steel concrete cushion cap at the lattice column top then and make tower crane, an end of pre-embedded bolt is solid in concrete bearing platform.This tower crane is the most frequently used way of tower crane in the present deep foundation ditch, but also exists as the problem of concrete bearing platform construction and dismounting, and expense is higher relatively, and underground structure construction is also existed unfavorable factor such as certain influence.(seeing " building operations " the 33rd volume the 3rd phase " the tower crane steel lattice column connects the application of pile foundation ")
Summary of the invention
The technical problem that the present invention will solve provides no cushion cap tower crane job practices in a kind of deep foundation ditch, thereby overcomes the deficiency that exists in the above-mentioned prior art.
For solving the problems of the technologies described above; No cushion cap tower crane job practices in the deep foundation ditch of the present invention; The present invention selects 4 bored piles for use according to the tower crane model, in the bored pile construction, inserts steel lattice column on the top of bored pile; Lattice column adopts angle steel to make 4 limb posts, adds the welding steel plate and makes batten plate; The concrete strength of treating bored pile reaches design strength 70% can be operated at the top of lattice column when above; The level excision lattice column top is unnecessary according to the tower crane setting height(from bottom) should guarantee after the excision that the top end face of lattice column is on the same horizontal plane; Add horizontal steel plate of weldering then at the top of lattice column, locate earlier before the steel plate welding, guarantee that bolt hole is in the lattice column center, behind the bolt hole location, hole, just can arrive on-the-spot being welded to connect between steel plate and the lattice column of carrying out after the boring; The installation that can advance tower crane after the steel plate welding of lattice capital is good; The welding of horizon bar and bridging between the lattice column in cheating, after carrying out soil excavation, along with the excavation of the earthwork deeply; Between lattice column, add the weldering bridging, to strengthen the integral rigidity between the steel lattice column.
Concrete, said method of the present invention comprises following performing step:
1), carries out the design (stake long, footpath and pile spacing) of 4 bored piles of tower crane according to the model of geologic report, tower crane and the size of standard knot thereof;
2), carry out the location of 4 bored piles according to the tower crane layout plan;
3), utilize, stake footpath long to select suitable circulation drill to carry out the boring of bored pile according to the stake of design, carry out processing and the processing and fabricating of steel lattice column of the reinforcing cage of bored pile in the time of boring, after drilling depth meets the demands, carry out hole clearly; Lattice column adopts angle steel to make 4 limb posts, adds the welding steel plate and makes batten plate;
4), carry out reinforcing cage and hang in the hand-hole after the boring, reinforcing cage topmost part note lattice column being overlapped with reinforcing cage and together transfer in the hole by designing requirement.
5), reinforcing cage carries out burying underground of perfusion cannula after inserting in the hole, the conduit built-in length should guarantee that concrete begins to build greater than hole depth at the bottom of the hole.
6), concrete casting carries out through conduit, along with concrete pours into constantly that conduit should constantly up be lifted and withdraws from by joint, irrigation amount should guarantee that a hole inner concrete is closely knit through calculating, pouring length should be greater than designing pile length.
7), steel latticework capital equating: concrete perfusion intensity reaches the soil excavation that 70% of designing requirement intensity can carry out lattice column top to be removed, and removes mud and plain concrete in the lattice column; According to tower crane the absolute altitude requirement is installed, cuts off lattice column complementary angle steel at most, before cutting off in the standardized road of lattice capital HRL, cut off unnecessary angle steel according to horizon, it is whole to cut off the back equating;
8), lattice capital steel plate and bolt hole location: the equating of lattice capital is arranged into four lattice capitals respectively with 4 steel lattice later; According to the position of fine position 4 block plates of lattice column, make structure lattice column top be in steel plate centermost, spot welding fixation steel plate; Then the tower crane standard knot is hung onto on the steel plate; Prize standard knot and make its centermost that is in every block plate as far as possible, mix up the back and locate 4 block plate bore positions, the position of portrayal bolt hole on every block plate according to the bolt hole on the standard knot;
9), steel plate upper bolt hole perforate;
10), steel plate and lattice capital are welded to connect: arc welding is adopted in the steel plate welding; Seam during welding between elder generation weldable steel lattice column top (4 angle steel) and the steel plate; Regulate the size of current of welding machine before the welding, the bar weld seam welds, the layering welding; After the welding of first road was accomplished, the knock-off welding slag carried out the welding of second road and satisfies the design thickness requirement up to throat depth;
11), the welding of connector between the following lattice column of steel plate: connector adopts the angle steel of angle steel and lattice column to be welded to connect between the following lattice column of steel plate.
The present invention is with respect to the way of tower crane in the present common deep foundation ditch, all adopts the steel work technology to realize that the tower crane standard knot is connected with the bored pile transition, evaded when the employing concrete bearing platform is done transition the influence of structure construction, practiced thrift construction cost.
Description of drawings
Fig. 1 is the construction node sectional drawing of one embodiment of the invention;
Among the figure: 1. tower crane standard knot, 2. connecting bolt, the 3. steel plate in strap bolt hole, 4. steel lattice column, 5. connecting angle, 6. steel lattice column anchors into the part in the bored pile, 7. bored pile.
Practical implementation worker mode
Elaborate in the face of embodiments of the invention down, present embodiment is a prerequisite with technical scheme of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment:
Certain teaching building reconstruction project, superstructure have three monomers, and building height is 79m, and the excavation of foundation pit area is 10000m 2, the excavation of foundation pit degree of depth is 7m, and vertical transport adopts two QTZ80 tower cranes, and tower crane adopts the bored pile of 4 diameter 800mm; The long 20m of stake, pile spacing is 1600mm, when bored pile is built pile concrete; The long steel lattice column of 10m is inserted on top at bored pile, and steel lattice column inserts pile body length 3m, and steel lattice column adopts ∠ 140mm * 14mm angle steel to make the four limbs post; Add the steel plate that welds 380mm * 260mm * 10mm and make batten plate, throat depth is 12mm, and the spacing of batten plate is 600mm.The concrete strength of treating bored pile reaches design strength 70% can be operated at the top of lattice column when above; The part of horizontal excision steel lattice column top is unnecessary according to the tower crane setting height(from bottom) should guarantee after the excision that the top end face of steel lattice column is on the same horizontal plane; Add the level of welding a 600mm * 600mm * 50mm then at the top of steel lattice column and seal steel plate; Locate earlier before the steel plate welding; Guarantee that bolt hole is in the steel lattice column center; Behind the bolt hole location, hole, just can arrive on-the-spot being welded to connect between steel plate and the steel lattice column of carrying out after the boring to factory.The installation that can advance tower crane after the acceptance(check) is accomplished in the steel plate welding of steel latticework capital; After carrying out soil excavation, along with the excavation of the earthwork is deep, between lattice column, add the weldering bridging, to strengthen the integral rigidity between the steel lattice column.
Below further provide the detailed construction sequence of present embodiment:
1, carries out the location of 4 bored piles according to the tower crane layout plan;
2, utilize circulation drill to carry out the boring of bored pile, carry out processing and the processing and fabricating of steel lattice column of the reinforcing cage of bored pile in the time of boring, after boring meets the demands, carry out hole clearly;
4, carry out reinforcing cage and hang in the hand-hole after the boring, reinforcing cage topmost part notices that be 3m by designing requirement with the lap length on lattice column and reinforcing cage top, together transfers in the hole.
5, reinforcing cage carries out burying underground of perfusion cannula after inserting in the hole, and the conduit built-in length should guarantee that concrete begins to build greater than hole depth 1m at the bottom of the hole.
6, concrete casting is carried out through conduit, and along with concrete pours into constantly that conduit should constantly up be lifted and withdraws from by joint, irrigation amount should guarantee that a hole inner concrete is closely knit through calculating, and pouring length should be greater than designing pile length 1m.
7, steel latticework capital equating: concrete perfusion intensity reaches the soil excavation that 70% of designing requirement intensity can carry out lattice column top to be removed, and excavating the degree of depth generally is 1.5m, removes earth and plain concrete in the lattice column; According to tower crane the absolute altitude requirement is installed, cuts off lattice column complementary angle steel at most, utilize before cutting off level measurement in the standardized road of lattice capital HRL, cut off unnecessary angle steel according to horizon with oxygen-acetylene, cut off the back and put in order with the abrasive machine equating;
8, lattice capital steel plate and bolt hole location: the equating of lattice capital can be arranged into the steel lattice of 4 600mm * 600mm * 50mm specification respectively 4 lattice capitals later on; Position according to fine position 4 block plates of lattice column; Make structure lattice column top be in the steel plate centermost; The spot welding fixation steel plate hangs onto the tower crane standard knot on the steel plate then, prizes standard knot with crowbar and makes it be in the centermost of every block plate as far as possible; Mix up the back and locate 4 block plate bore positions, on every block plate, portray the position of bolt hole with crayon according to the bolt hole on the standard knot;
9, steel plate upper bolt hole perforate: tower crane producer is generally delivered in the perforate of steel plate upper bolt hole or lathe factory carries out perforate;
10, steel plate and lattice capital are welded to connect: arc welding is adopted in the steel plate welding; Welding rod adopts low hydrogen E4315 type welding rod, and the seam during welding between elder generation weldable steel lattice column top (four angle steel) and the steel plate regulates the size of current of welding machine before the welding; The bar weld seam welds; The layering welding after the welding of first road is accomplished, is carried out the welding of second road with the vertical knock-off welding slag of tingle and is not less than 12mm up to throat depth;
11, the welding of connector between the following lattice column of steel plate: connector adopts the angle steel of 14# angle steel and lattice column to be welded to connect between the following lattice column of steel plate;
12, the welding of horizon bar and bridging between the interior lattice column in hole: after foundation ditch carries out soil excavation,, between lattice column, add the weldering bridging, to strengthen the integral rigidity between the steel lattice column along with the excavation of the earthwork is deep.
Not having the cushion cap tower crane through present embodiment implements; Tower crane is caught up with at the pit earthwork excavation construction and is accomplished; Carrying out tower crane before the soil excavation installs; For soil excavation and foundation pit reinforced concrete support construction vertical and horizontal transportation service is provided, the tower crane utilization rate is high, has accelerated the underground structure construction speed; Tower crane is installed the basic safety in back and is not affected.Compare steel lattice column top and adopt steel concrete cushion cap basis, its total cost practices thrift 15%~20%, remarkable in economical benefits.

Claims (4)

1. the interior no cushion cap tower crane job practices of deep foundation ditch is characterized in that comprising the steps:
1), carry out the design of 4 bored piles of tower crane, comprise that stake is long according to the model of geologic report, tower crane and the size of standard knot thereof, stake footpath and a pile spacing;
2), carry out the location of 4 bored piles according to the tower crane layout plan;
3), utilize, stake footpath long to select circulation drill to carry out the boring of bored pile according to the stake of design, carry out processing and the processing and fabricating of steel lattice column of the reinforcing cage of bored pile in the time of boring, after drilling depth meets the demands, carry out hole clearly; Said lattice column adopts angle steel to make the four limbs post, adds the welding steel plate and makes batten plate;
4), carry out reinforcing cage and hang in the hand-hole after the boring, reinforcing cage topmost part note lattice column being overlapped with reinforcing cage and together transfer in the hole by designing requirement;
5), reinforcing cage carries out burying underground of perfusion cannula after inserting in the hole, the conduit built-in length guarantees that greater than hole depth concrete begins to build at the bottom of the hole;
6), concrete casting carries out through conduit, along with concrete pours into constantly that conduit should constantly up be lifted and withdraws from by joint, irrigation amount should guarantee that a hole inner concrete is closely knit through calculating, pouring length is greater than designing pile length;
7), steel latticework capital equating: concrete perfusion intensity reaches the soil excavation that 70% of designing requirement intensity carries out lattice column top to be removed, and removes mud and plain concrete in the lattice column; According to tower crane the absolute altitude requirement is installed, cuts off lattice column complementary angle steel at most, before cutting off in the standardized road of lattice capital HRL, cut off unnecessary angle steel according to horizon, it is whole to cut off the back equating;
8), lattice capital steel plate and bolt hole location: the equating of lattice capital is arranged into 4 lattice capitals respectively with 4 block plates later; According to the position of the fine position steel plate of lattice column, make structure lattice column top be in steel plate centermost, spot welding fixation steel plate; Then the tower crane standard knot is hung onto on the steel plate; Prize standard knot and make its centermost that is in every block plate as far as possible, mix up the back and locate 4 block plate bore positions, the position of portrayal bolt hole on every block plate according to the bolt hole on the standard knot;
9), steel plate upper bolt hole perforate;
10), steel plate and lattice capital are welded to connect: arc welding is adopted in the steel plate welding; Seam during welding between elder generation's weldable steel 4 angle steel in lattice column top and the steel plate; Regulate the size of current of welding machine before the welding, the bar weld seam welds, the layering welding; After the welding of first road was accomplished, the knock-off welding slag carried out the welding of second road and satisfies the design thickness requirement up to throat depth;
11), the welding of connector between the following lattice column of steel plate: connector adopts the angle steel of angle steel and lattice column to be welded to connect between the following lattice column of steel plate.
2. no cushion cap tower crane job practices in the deep foundation ditch according to claim 1 is characterized in that: the four limbs post of said lattice column adopts the angle steel of ∠ 140mm * 14mm.
3. no cushion cap tower crane job practices in the deep foundation ditch according to claim 1, it is characterized in that: the said welding steel plate that adds is made batten plate, and wherein throat depth is 12mm, and the spacing of batten plate is 600mm.
4. according to no cushion cap tower crane job practices in claim 1 or the 3 described deep foundation ditchs, it is characterized in that: said batten plate adopts the steel plate of 380mm * 260mm * 10mm.
CN2012100816542A 2012-03-23 2012-03-23 Construction method for tower crane foundation without bearing platform in deep foundation pit CN102587407A (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN103046542A (en) * 2012-12-04 2013-04-17 中建三局建设工程股份有限公司 Simultaneous construction technology for deep foundation pit inner support steel tube column and cast-in-place concrete pile
CN103132537A (en) * 2013-02-04 2013-06-05 中天建设集团有限公司 Steel latticed column homocentric-square-shaped concrete bearing platform combination type tower crane base structure and construction method
CN103225304A (en) * 2013-04-28 2013-07-31 国电联合动力技术有限公司 Marine foundation supporting structure and construction method thereof
CN104532823A (en) * 2014-12-26 2015-04-22 上海建工五建集团有限公司 Tower crane foundation without pile foundation
CN105484285A (en) * 2015-11-27 2016-04-13 中国一冶集团有限公司 Spliced steel pipe concrete column type high bearing platform tower crane foundation structure and construction method
CN105951869A (en) * 2016-05-31 2016-09-21 中国冶集团有限公司 Construction method of steel latticework column tower crane foundation for underground garage without reserving construction joints
CN106988293A (en) * 2017-04-27 2017-07-28 中国葛洲坝集团机电建设有限公司 A kind of ship lift main equipment room steel lattice column construction method and installation accuracy control method
CN107964976A (en) * 2017-11-24 2018-04-27 常州第建筑集团有限公司 Steel pipe-conversion steel platform tower crane top-down construction method

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103046542A (en) * 2012-12-04 2013-04-17 中建三局建设工程股份有限公司 Simultaneous construction technology for deep foundation pit inner support steel tube column and cast-in-place concrete pile
CN103046542B (en) * 2012-12-04 2015-09-30 中建三局建设工程股份有限公司 Deep foundation pit inner support steel tube column and cast-in-place concrete pile construction technology simultaneously
CN103132537A (en) * 2013-02-04 2013-06-05 中天建设集团有限公司 Steel latticed column homocentric-square-shaped concrete bearing platform combination type tower crane base structure and construction method
CN103225304A (en) * 2013-04-28 2013-07-31 国电联合动力技术有限公司 Marine foundation supporting structure and construction method thereof
CN103225304B (en) * 2013-04-28 2016-09-14 国电联合动力技术有限公司 A kind of marine foundation supporting structure and construction method thereof
CN104532823A (en) * 2014-12-26 2015-04-22 上海建工五建集团有限公司 Tower crane foundation without pile foundation
CN105484285A (en) * 2015-11-27 2016-04-13 中国一冶集团有限公司 Spliced steel pipe concrete column type high bearing platform tower crane foundation structure and construction method
CN105951869A (en) * 2016-05-31 2016-09-21 中国冶集团有限公司 Construction method of steel latticework column tower crane foundation for underground garage without reserving construction joints
CN106988293A (en) * 2017-04-27 2017-07-28 中国葛洲坝集团机电建设有限公司 A kind of ship lift main equipment room steel lattice column construction method and installation accuracy control method
CN106988293B (en) * 2017-04-27 2018-12-21 中国葛洲坝集团机电建设有限公司 A kind of ship lift main equipment room steel lattice column construction method and installation accuracy control method
CN107964976A (en) * 2017-11-24 2018-04-27 常州第建筑集团有限公司 Steel pipe-conversion steel platform tower crane top-down construction method

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Application publication date: 20120718