CN101666086B - Cement cast-in-situ pile of prefabricated part and construction method thereof - Google Patents
Cement cast-in-situ pile of prefabricated part and construction method thereof Download PDFInfo
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- CN101666086B CN101666086B CN200910056278XA CN200910056278A CN101666086B CN 101666086 B CN101666086 B CN 101666086B CN 200910056278X A CN200910056278X A CN 200910056278XA CN 200910056278 A CN200910056278 A CN 200910056278A CN 101666086 B CN101666086 B CN 101666086B
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Abstract
The invention relates to the field of novel building envelops in a deep foundation design and a construction method, in particular to a cement cast-in-situ pile of a prefabricated part and a construction method thereof. The cement cast-in-situ pile of the prefabricated part comprises a pile hole, wherein cement is filled in the pile hole, and the strip-shaped prefabricated part is inserted into the pile hole. The invention also discloses a construction method of the cement cast-in-situ pile of the prefabricated part, which comprises the following steps: 1. drilling the group to form the pile hole; 2. pouring the cement sludge in the pile hole; and 3. inserting the strip-shaped prefabricated part in the pile hole. The cement cast-in-situ pile of the prefabricated part and the construction method thereof effectively lower the cost on the premise of meeting the stress requirement of a bracing structure of a foundation pit and ensuring the safety. The cement cast-in-situ pile of the prefabricated part belongs to a novel safe and efficient building envelop structure form with low cost and little environment influence and can improve the building envelop structure form of the underground engineering filed to further meet the engineering construction requirement.
Description
Technical field
The present invention relates to the novel space enclosing structure field in deep foundation design and the job practices, relate in particular to cement cast-in-situ pile of prefabricated part and job practices thereof.
Background technology
The space enclosing structure of foundation ditch is mainly used in bears soil pressure and the water pressure that the excavation of foundation pit off-load is produced, and this pressure is passed to support.The space enclosing structure of foundation ditch is to stablize a kind of wall-retaining structure of foundation ditch.At present, the soft clay area foundation pit enclosure structure pattern of the excavation of foundation pit degree of depth more than 10m that be applicable to commonly used mainly contains: the stake of SMW worker's method, bored pile and diaphragm wall etc.
Wherein, the stake of SMW worker's method is to insert the compound retaining soil water-stopping structure that shaped steel forms in the triaxial cement mixing pile of socket continuously.SMW worker's method (soil mixing wall) full name " the compound agitation pile of shaped steel cement-soil (wall) supporting and protection structure technology ".This method is to insert the formed a kind of new construction method of underground continuous wall of H shape shaped steel in cement soil deep agitation pile (wall).Its principle is with special-purpose machines and tools, carries out the mandatory stirring of original position on the spot with cement-soil as curing compound and foundation soil, and insertion shaped steel, solidify the back and form stake row formula diaphragm wall body, make full use of the intensity that high sealing and shaped steel had and the rigidity of cement-soil retaining wall.The shortcoming of SMW worker's method stake is: when duration during greater than 6 months, can cause the shaped steel lease expenses to increase, and shaped steel is pulled out cumbersome.
Wherein, bored pile is gone along with sb. to guard him and is belonged to colonnade formula retaining wall, itself can not sealing, water-stop curtain need be set in addition, and its shortcoming is: because its cross section is circular, so mechanical characteristic is relatively poor; As being subjected to force intensity for improving it, needing increases the reinforcing bar input, so can cause the waste of part amount of reinforcement.
Wherein, the shortcoming of diaphragm wall is: cost is higher, and the construction technology complexity.
In sum, at present existing space enclosing structure pattern can't satisfy the engineering construction demand fully in China's underground engineering construction, therefore, presses for a kind of cost economic of exploitation, ambient influnence little, safe, space enclosing structure pattern and construction technology thereof efficiently.
Summary of the invention
The object of the present invention is to provide a kind of cement cast-in-situ pile of prefabricated part and job practices thereof, guarantee under the safe prerequisite, effectively reduce the cost cost satisfying the foundation pit enclosure structure force request.
To achieve the above object, the invention provides a kind of cement cast-in-situ pile of prefabricated part, comprise a hole, described stake hole contains cement grout, and in described stake hole, be plugged with the prefabricated units of a strip, described prefabricated units are a steel and concrete combination beam member, described steel and concrete combination beam member comprise H shaped steel and two reinforced concrete thick plates, described H shaped steel is connected and composed by a junction plate by two side plates, and described reinforced concrete thick plate is fitted and connected the side plate outside at described H shaped steel respectively; Perhaps, described prefabricated units are a steel and concrete composite roof truss member, described steel and concrete composite roof truss member comprise a reinforced concrete thick plate and a steel truss, described steel truss is connected to form by some web members by upper and lower chord member, and described reinforced concrete thick plate is fixedly connected on the upper chord upside of described steel truss.
Further, the cross section of described prefabricated units axisymmetricly.
Further, when described prefabricated units were a steel and concrete combination beam member, described reinforced concrete thick plate adopted peg to be connected with the side plate of described H shaped steel.
Further, when described prefabricated units were a steel and concrete combination beam member, described H shaped steel was made by steel sheet.
Further, when described prefabricated units were a steel and concrete composite roof truss member, described reinforced concrete thick plate adopted peg to be connected with the upper chord of steel truss.
Further, when described prefabricated units were a steel and concrete composite roof truss member, the upper and lower chord member of described steel truss adopted angle steel, and described web member adopts steel pipe.
The invention also discloses a kind of job practices of cement cast-in-situ pile of prefabricated part, comprise the steps:
The first step forms a hole to surface drilling;
In second step, in described stake hole, pour into cement grout;
The 3rd step, the prefabricated units of insertion one strip in described stake hole;
Described prefabricated units are a steel and concrete combination beam member, described steel and concrete combination beam member comprise H shaped steel and two reinforced concrete thick plates, described H shaped steel is connected and composed by a junction plate by two side plates, described reinforced concrete thick plate is fitted and connected the side plate outside at described H shaped steel respectively, perhaps, described prefabricated units are a steel and concrete composite roof truss member, described steel and concrete composite roof truss member comprise a reinforced concrete thick plate and a steel truss, described steel truss is by last, lower chord connects to form by some web members, and described reinforced concrete thick plate is fixedly connected on the upper chord upside of described steel truss.
Further, in the described first step, adopt the normal circulation technology pore-forming.
Further, in described second step, will precipitate mud earlier and cement stirs, and adopt tremie method to pour in described the hole then.
Further, the cross section of described prefabricated units axisymmetricly.
Further, when described prefabricated units were a steel and concrete combination beam member, described reinforced concrete thick plate adopted peg to be connected with the side plate of described H shaped steel.
Further, when described prefabricated units were a steel and concrete combination beam member, described H shaped steel was made by steel sheet.
Further, when described prefabricated units were a steel and concrete composite roof truss member, described reinforced concrete thick plate adopted peg to be connected with the upper chord of steel truss.
Further, when described prefabricated units were a steel and concrete composite roof truss member, the upper and lower chord member of described steel truss adopted angle steel, and described web member adopts steel pipe.
The invention has the beneficial effects as follows:
Cement cast-in-situ pile of prefabricated part of the present invention is compared with bored pile and the stake of SMW worker's method:
1, adopt the water-stop curtain and the soil-baffling structure of cement cast-in-situ pile of prefabricated part of the present invention to unite two into one, the cross section mechanical characteristic is better, compares with bored pile and has reduced steel and concrete consumption.
2, the cost of cement cast-in-situ pile of prefabricated part of the present invention is not influenced by the construction period fully, and especially for the foundation ditch of overlarge area, the stake of SMW worker's method does not possess economic comparativity fully.
3, cement cast-in-situ pile of prefabricated part job practices of the present invention is based on original construction machinery, thereby, saved a large amount of mechanical R﹠D costs.
4, bored pile and cement cast-in-situ pile of prefabricated part of the present invention are made economy relatively, can find: three kinds of novel space enclosing structure pattern costs that the present invention proposes are littler by about 10%～20% than bored pile, and You Yigang and concrete composite roof truss pattern are saved most.
In sum, cement cast-in-situ pile of prefabricated part of the present invention and job practices thereof guarantee under the safe prerequisite satisfying the foundation pit enclosure structure force request, effectively reduce the cost cost.Belong to that a kind of cost economic, ambient influnence are little, safety and novel efficiently space enclosing structure pattern, can improve the space enclosing structure pattern of underground engineering field, further to satisfy the engineering construction demand.
Description of drawings
Cement cast-in-situ pile of prefabricated part of the present invention is provided by following embodiment and accompanying drawing.
Fig. 1 a is the structural representation of cement cast-in-situ pile of prefabricated part of the present invention;
Fig. 1 b is the cross-sectional structure schematic diagram of prefabricated units among the embodiment 1;
Fig. 1 c is the arrangement of reinforcement situation schematic diagram of prefabricated units among the embodiment 1;
Fig. 2 is the cross-sectional structure schematic diagram of prefabricated units among the embodiment 2;
Fig. 3 a is the cross-sectional structure schematic diagram of prefabricated units among the embodiment 3;
Fig. 3 b is the vertical section structure schematic diagram of prefabricated units among the embodiment 3;
Fig. 4 is the cross-sectional structure schematic diagram of prefabricated units among the embodiment 4;
Fig. 5 is the whole construction process flow chart of cement cast-in-situ pile of prefabricated part job practices of the present invention;
Fig. 6 is the sequence of construction figure of the many piles of the present invention;
Fig. 7 is the single pile constructing process flow chart of the present invention;
Among the figure, 1-stake hole, 2-cement grout, 3-prefabricated units, 311-hole, 321-H shaped steel, 3211-side plate, 3212-junction plate, 322-reinforced concrete thick plate, 331-steel truss, the 3311-upper chord, 3312-lower chord, 3312-web member, 332 reinforced concrete thick plates, 341-reinforcing bar.
The specific embodiment
Below will be described in further detail cement cast-in-situ pile of prefabricated part of the present invention.
See also Fig. 1 a, this cement cast-in-situ pile of prefabricated part comprises a hole 1, and described stake hole 1 contains cement grout 2, and is plugged with the prefabricated units 3 of a strip in described stake hole 1.
See also Fig. 1 b, consider two sides laterally-loaded effect, described prefabricated units 3 adopt the axial symmetry Cross section Design: both sides arrangement of reinforcement situation identical (seeing Fig. 1 c).Be described prefabricated units 3 cross section axisymmetricly.In the present embodiment, described prefabricated units 3 are concrete box type members.This concrete box type member is made by steel concrete, and its cross section is rectangular, and a rectangular opening 311 is established, saving reinforcing bar and concrete under the prerequisite that satisfies the foundation pit enclosure structure force request in the middle part of cross section.This prefabricated units 3 adopt the box-type section form of being made by steel concrete, for existing bored pile, can make full use of the tension ability of steel, can bring into play concrete anti-compression property again.Thereby, can maximize the advantage of bringing into play and utilizing material.
Present embodiment is applied to the foundation ditch of cutting depth about 13m.Consider that every linear meter(lin.m.) space enclosing structure can bear the moment of flexure of 1300KN.m, therefore can adopt the cement cast-in-situ pile of the prefabricated box-type member in φ 1100mm aperture, the long 26m of stake.Wherein prefabricated units adopt the box-type member cross section of 950mm * 400mm, and strength grade of concrete C40, arrangement of reinforcement be (among the figure, unit is mm) shown in Fig. 1 c, reinforcing bar grade HRB335.Wherein, the steel bars in concrete configuration is as follows: the reinforcing bar of the reinforcing bar of 12 φ 28mm, 6 φ 22mm and the reinforcing bar of 6 φ 10mm.These reinforcing bars build up above-mentioned concrete box type member by the stirrup connection of φ 10mm and by concrete casting.
In addition, according to depth of pore forming 27m, the stake footpath is φ 1100mm, considers to adopt GPS-10 type rig can satisfy the pore-forming requirement, and the 32t mobile crane is selected in the lifting of prefabricated units for use, and the lifting radius is controlled at 7m, and the biggest lifting capacity is about 10t, can satisfy the lifting operating mode.
The difference of present embodiment and embodiment 1 is: described prefabricated units 3 are a steel and concrete combination beam member, promptly adopt steel-concrete combined structure.This steel-concrete combined structure is compared with steel work, and it has saved steel, and has strengthened the rigidity of member or building, has improved non-deformability.This steel-concrete combined structure is compared with common reinforced concrete structure, it has alleviated weight, has increased the ductility of member, and has higher intensity, the wood property characteristics of these two kinds of materials of steel and concrete can be given full play to, thereby technology and economic unification can be accomplished.
See also Fig. 2, described steel and concrete combination beam member concrete structure are as follows: comprise H shaped steel 321 and two reinforced concrete thick plates 322.Described reinforced concrete thick plate 322 is made up of the concrete thickness plate that disposes some reinforcing bars.Described H shaped steel 321 connects and composes " H " shaped steel plate by two side plates 3211 by a junction plate 3212.Described reinforced concrete thick plate 322 is fitted and connected side plate 3211 outsides at described H shaped steel 321 respectively.Described H shaped steel 321 is made by steel sheet, constitutes " H " shaped steel plate of thin wing edge.Described H shaped steel 321 and reinforced concrete thick plate 322 combinations, and in concrete thickness plate, dispose more reinforcing bar.Like this according to the thought of steel work compound beam: can make full use of the tension ability of shaped steel and steel, can bring into play concrete anti-compression property again, therefore, can maximize performance and utilize the advantage of material.What this steel was different with existing compound beam with the concrete combination beam member is, prefabricated units 3 need to consider two sides laterally-loaded effect, need to adopt the axial symmetry Cross section Design: H shaped steel two side plates 3211 (i.e. two edges of a wing) adopt the uniform section steel plate, and reinforced concrete thick plate 322 cross sections are all identical with the arrangement of reinforcement situation outside the edge of a wing.
Described reinforced concrete thick plate 322 adopts peg to be connected with the side plate 3211 of described H shaped steel 321.Be that 3211 employing pegs of described reinforced concrete thick plate 322 and side plate are as shear connector.The diameter of peg is generally 12m～25mm, and in order to resist the effect of starting, major part or crotch are made in peg top.
See also Fig. 3 a and Fig. 3 b, the difference of present embodiment and embodiment 1 is: described prefabricated units 3 are a steel and concrete composite roof truss member.Described steel and concrete composite roof truss member comprise a reinforced concrete thick plate 332 and a steel truss 321.Described steel truss 321 is connected to form by some web members 3213 by upper and lower chord member 3211,3212.Described reinforced concrete thick plate 332 is fixedly connected on upper chord 3211 upsides of described steel truss 321.Described reinforced concrete thick plate 332 adopts peg to be connected with the upper chord 3211 of steel truss 321.The upper and lower chord member 3211,3212 of steel truss 321 can adopt angle steel, and web member 3213 can adopt the pattern of steel pipe.
This steel and concrete composite roof truss beam are a kind of novel combining structure forms, have good stress performance and better economic, can be widely used in the middle of the highrise building of large span, heavy load and super highrise building, the large-scale public building and industrial premises.This steel is compared with common compound beam with concrete composite roof truss beam, can further alleviate dead load, reduces cost.Comparing common compound beam saving steel reaches about 20%.And under the situation of equal steel using amount, this steel has bigger whole bending rigidity with concrete composite roof truss beam than common compound beam.
In addition, this steel and concrete composite roof truss beam and steel-concrete composite beam are similar, need to be provided with shear connector too at steel truss 321 and 332 of reinforced concrete thick plates.Shear connector is used for bearing the longitudinal shear power and the vertical vitals that starts effect between reinforced concrete thick plate 332 and the steel truss 321.The quality of its performance has great influence to various mechanical properties such as the bearing capacity of total, distortion.
Embodiment 4
See also Fig. 4, the difference of present embodiment and embodiment 1 is: described prefabricated units 3 are prestressed concrete members, and described prestressed concrete member is that the rectangular inside of cross section is provided with the prestressed concrete structure of having of reinforcing bar 341.
This prestressed concrete member can reduce or offset the caused concrete pulling stress of load, thereby make the tensile stress of structural element little, even be in pressured state owing to make full use of high strength cast iron and strong concrete.It has the crack resistance and the rigidity that can improve member, and can save reinforcing bar, alleviates the advantage of deadweight.
Embodiment 5
See also Fig. 5, Fig. 5 is the whole construction process flow chart of cement cast-in-situ pile of prefabricated part job practices of the present invention.This cement cast-in-situ pile of prefabricated part job practices whole construction process flow process mainly comprises the steps: at first, cleaning underground obstacle, smooth place; Then, excavation guide channel; Then, saddle is set; Then, stake machine location meanwhile needs to carry out following preparation: prepare mud jacking (configuring the cement paste that is stirred into by precipitation mud and cement) and be ready to pumping compressed air; Then, creep into stirring, Yi Bian creep into, Yi Bian mud jacking and pumping compressed air stir simultaneously; Then, insert prefabricated units, it is realized by lifting machine; At last, carrying out spoir handles.Wherein, the preparation method of described prefabricated units is as follows: at first, carry out cage of reinforcement and make, then, make up the steel member and install, and last, carry out concreting and maintenance.
See also Fig. 6, Fig. 6 is the sequence of construction figure of many piles.These adopt to jump to beat and form.Each A stake of construction earlier, before the cement grout initial set in the A stake, the B stake of having constructed.Concise and to the point step is as follows: earlier surface drilling is formed the stake hole 1 of several A stake, then, pour into cement grout, then, insert prefabricated units 3, thereby finish the construction of A stake.Then, must before the cement grout initial set of A stake, finish the construction of B stake.The job practices of B stake is as the A stake.
See also Fig. 7, Fig. 7 is the single cement cast-in-situ pile of prefabricated part construction flow chart of the present invention.The job practices of this cement cast-in-situ pile of prefabricated part comprises the steps:
The first step forms a hole 1 to surface drilling.In the described first step, adopt the normal circulation technology pore-forming.
In second step, in described stake hole 1, pour into cement grout 2.In described second step, will precipitate mud and cement earlier and stir and be mixed with needed cement grout 21, and adopt tremie method to pour in described the hole then.The above first step and second step are exactly to creep into agitating procedure segmentation in the above-mentioned whole construction process.
The 3rd step, the prefabricated units 3 of insertion one strip in described stake hole 1.Described prefabricated units 3 are identical with prefabricated units form of structure among the embodiment 1.Described prefabricated units 3 are concrete box type members, and described concrete box type member is made by steel concrete, and its cross section is rectangular, and a rectangular opening is established at the middle part of cross section.The cross section of described prefabricated units axisymmetricly.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (14)
1. cement cast-in-situ pile of prefabricated part, comprise a hole, it is characterized in that: described stake hole contains cement grout, and in described stake hole, be plugged with the prefabricated units of a strip, described prefabricated units are a steel and concrete combination beam member, described steel and concrete combination beam member comprise H shaped steel and two reinforced concrete thick plates, described H shaped steel is connected and composed by a junction plate by two side plates, and described reinforced concrete thick plate is fitted and connected the side plate outside at described H shaped steel respectively; Perhaps, described prefabricated units are a steel and concrete composite roof truss member, described steel and concrete composite roof truss member comprise a reinforced concrete thick plate and a steel truss, described steel truss is connected to form by some web members by upper and lower chord member, and described reinforced concrete thick plate is fixedly connected on the upper chord upside of described steel truss.
2. cement cast-in-situ pile of prefabricated part as claimed in claim 1 is characterized in that: the cross section of described prefabricated units axisymmetricly.
3. cement cast-in-situ pile of prefabricated part as claimed in claim 1 is characterized in that: when described prefabricated units were a steel and concrete combination beam member, described reinforced concrete thick plate adopted peg to be connected with the side plate of described H shaped steel.
4. cement cast-in-situ pile of prefabricated part as claimed in claim 1 is characterized in that: when described prefabricated units were a steel and concrete combination beam member, described H shaped steel was made by steel sheet.
5. cement cast-in-situ pile of prefabricated part as claimed in claim 1 is characterized in that: when described prefabricated units were a steel and concrete composite roof truss member, described reinforced concrete thick plate adopted peg to be connected with the upper chord of steel truss.
6. cement cast-in-situ pile of prefabricated part as claimed in claim 1 is characterized in that: when described prefabricated units were a steel and concrete composite roof truss member, the upper and lower chord member of described steel truss adopted angle steel, and described web member adopts steel pipe.
7. the job practices of a cement cast-in-situ pile of prefabricated part is characterized in that: comprise the steps:
The first step forms a hole to surface drilling;
In second step, in described stake hole, pour into cement grout;
The 3rd step, the prefabricated units of insertion one strip in described stake hole;
Described prefabricated units are a steel and concrete combination beam member, described steel and concrete combination beam member comprise H shaped steel and two reinforced concrete thick plates, described H shaped steel is connected and composed by a junction plate by two side plates, described reinforced concrete thick plate is fitted and connected the side plate outside at described H shaped steel respectively, perhaps, described prefabricated units are a steel and concrete composite roof truss member, described steel and concrete composite roof truss member comprise a reinforced concrete thick plate and a steel truss, described steel truss is by last, lower chord connects to form by some web members, and described reinforced concrete thick plate is fixedly connected on the upper chord upside of described steel truss.
8. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: in the described first step, adopt the normal circulation technology pore-forming.
9. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: in described second step, will precipitate mud earlier and cement stirs, and adopt tremie method to pour in described the hole then.
10. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7, it is characterized in that: the cross section of described prefabricated units axisymmetricly.
11. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: when described prefabricated units were a steel and concrete combination beam member, described reinforced concrete thick plate adopted peg to be connected with the side plate of described H shaped steel.
12. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: when described prefabricated units were a steel and concrete combination beam member, described H shaped steel was made by steel sheet.
13. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: when described prefabricated units were a steel and concrete composite roof truss member, described reinforced concrete thick plate adopted peg to be connected with the upper chord of steel truss.
14. the job practices of cement cast-in-situ pile of prefabricated part as claimed in claim 7 is characterized in that: when described prefabricated units were a steel and concrete composite roof truss member, the upper and lower chord member of described steel truss adopted angle steel, and described web member adopts steel pipe.
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| CN105649074B (en) * | 2016-03-22 | 2019-09-03 | 沙焕焕 | The squeezed concrete stiff composite pile of tubular pole and its construction method |
| CN106120807A (en) * | 2016-07-27 | 2016-11-16 | 东通岩土科技（杭州）有限公司 | Permanent foundation pit enclosure soil cement rigid wall and construction method thereof |
| CN111851859A (en) * | 2020-08-28 | 2020-10-30 | 河南昌煜科技有限公司 | Steel bar truss H-shaped steel |
| CN112554205A (en) * | 2020-12-08 | 2021-03-26 | 中建三局集团有限公司 | PEC structure supporting pile and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2353795Y (en) * | 1999-01-13 | 1999-12-15 | 中国建筑科学研究院地基基础研究所 | Prefabricated-tube composite pile of cement and soil |
| JP2001271347A (en) * | 2000-03-24 | 2001-10-05 | Asahi Kasei Corp | Drop method for ready-made pile |
| CN1409467A (en) * | 2001-09-26 | 2003-04-09 | 日本伺服株式会社 | Brushless DC motor |
| JP2004308411A (en) * | 2003-03-25 | 2004-11-04 | Mitani Sekisan Co Ltd | Existing concrete pile foundation having large diameter and method for burying existing pile |
| CN2823330Y (en) * | 2005-07-07 | 2006-10-04 | 北京建材地质工程公司 | Special shaped cement soil pile |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2353795Y (en) * | 1999-01-13 | 1999-12-15 | 中国建筑科学研究院地基基础研究所 | Prefabricated-tube composite pile of cement and soil |
| JP2001271347A (en) * | 2000-03-24 | 2001-10-05 | Asahi Kasei Corp | Drop method for ready-made pile |
| CN1409467A (en) * | 2001-09-26 | 2003-04-09 | 日本伺服株式会社 | Brushless DC motor |
| JP2004308411A (en) * | 2003-03-25 | 2004-11-04 | Mitani Sekisan Co Ltd | Existing concrete pile foundation having large diameter and method for burying existing pile |
| CN2823330Y (en) * | 2005-07-07 | 2006-10-04 | 北京建材地质工程公司 | Special shaped cement soil pile |
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