CN201650154U - Adjustable multi-stage helical extruding type drilling tool - Google Patents
Adjustable multi-stage helical extruding type drilling tool Download PDFInfo
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- CN201650154U CN201650154U CN2010201910425U CN201020191042U CN201650154U CN 201650154 U CN201650154 U CN 201650154U CN 2010201910425 U CN2010201910425 U CN 2010201910425U CN 201020191042 U CN201020191042 U CN 201020191042U CN 201650154 U CN201650154 U CN 201650154U
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Abstract
The utility model discloses an adjustable multi-stage helical extruding type drilling tool. The drilling tool comprises a hollow connecting rod, a helical blade is formed at the middle lower part of the outer side wall of the connecting rod, a drilling bit is arranged at the bottom end of the connecting rod, a plurality of helical extruding bodies are coaxially connected on the connecting rod in series, and are positioned between the adjacent helical blade bodies, a helical line is formed on the edge of the cross section of each helical extruding body, the maximum outside diameter and the minimum outside diameter of each helical extruding body are constant or gradually increase from bottom to up, and the maximum outside diameter of each helical extruding body is equal to or smaller than the outside diameter of the helical blade. The utility model aims to provide an adjustable multi-stage helical extruding type drilling tool which is capable of penetrating through a thick hard clay layer or dense sandy soil layer, avoiding the slumped hole caused when areas with high ground water level or high hydrodynamic pressure are drilled, and realizing complete extruding type bored concrete piles or partial extruding type bored concrete piles in a multi-stage extruding manner at areas of different depths according to the longitudinal distribution of the stratum by freely adjusting the positions of the multi-stage extruding bodies.
Description
Technical field
The utility model relates to a kind of adjustable multiple coil extruding and expanding drilling tool that is applied to field of civil engineering.
Background technology
In civil engineering pile foundation field, modern pile foundation can be divided into non-soil compaction stake, the stake of part soil compaction and complete soil compaction stake three major types according to the influence of piling method to the stratum.Long screw pouring piles CFA stake at present both at home and abroad commonly used belongs to non-soil compaction stake, its have easy construction, speed soon, characteristics such as friction, low noise, obtained extensive use in fields such as pile foundation engineering, ground processing, pattern foundation pit supporting structures.But problems such as bearing capacity is lower and unearthed, contaminated environment that the CFA stake exists.Geotechnical engineering circle is devoted to the complete soil compaction type castinplace pile of development of new always in recent years, and representative have short spiral extrusion soil filling pile (ZL200710063983.3), full thread stake (ZL96119602.5), a semi-screw pile (ZL03128265.2) etc.Compare with non-soil compaction stake, soil compaction type spiral extrusion soil filling pile also has the advantage of environmental protection aspects such as no mud and no dregs discharging, friction, low noise except that having tangible technology and cost advantage fully.But above-mentioned semi-screw pile, full thread stake and short spiral extrusion soil filling pile remain in some problems and limitation in the practical engineering application process.Such as, semi-screw pile or full thread stake have 2/3 or the long screw thread of full stake for realizing pile body, must adopt complicated simultaneous techniques and technology in the work progress of stake; Because great majority constructions stratum have the uncertainty of distribution and the heterogeneity of soil nature, be difficult to guarantee a screw thread generative process instantaneous synchronously, thereby cause that partly or entirely a stake screw thread can not be according to the designing requirement moulding.And short spiral extrusion soil filling pile finally forms columniform complete soil compaction stake by applying equidirectional moment of torsion, does not need simultaneous techniques; But the bidirectional helix closed extruding-enlarging aiguille that existing short spiral extrusion soil filling pile pile is adopted, because the soil compaction amount is big, thicker gumbo layer or dense sand soil layer can not be effectively passed through in existence, influence the pile degree of depth.In addition, because the jointed rod diameter on short helix extruding-enlarging drill bit and half screw drilling tool top is less than the stake bore dia, easily cause the hole of collapsing in or the weak clay that flowing pressure is bigger and the sandy soil stratum higher in groundwater table, can cause that a side skin friction reduces, and has limited the scope of application of short spiral extrusion soil filling pile and semi-screw pile thus.
The utility model content
The purpose of this utility model is to provide a kind of can effectively penetrate thicker gumbo layer or thicker dense sand soil layer, occur the hole of collapsing when avoiding in phreatic high, big flowing pressure stratum drilling and forming hole, and can vertically distribute according to the stratum, by freely adjusting the position of multistage extruding expanding body, at the adjustable multiple coil extruding and expanding drilling tool of different depth through complete soil compaction type of multistage squeezed enforcement or part soil compaction type castinplace pile.
Adjustable multiple coil extruding and expanding drilling tool of the present utility model, the connecting rod that comprises hollow, the middle and lower part of the lateral wall of connecting rod is provided with helical blade, the bottom of connecting rod is provided with drill bit, coaxially on the described connecting rod be in series with a plurality of helix extruding-enlarging bodies, the helix extruding-enlarging body is positioned between the described helical blade, the edge of the cross section of each helix extruding-enlarging body is a helix, the maximum outside diameter of each helix extruding-enlarging body and minimum outer diameter are respectively constant or increase gradually from bottom to top, and the maximum outside diameter of each helix extruding-enlarging body is equal to or less than the external diameter of described helical blade.
The utility model adjustable multiple coil extruding and expanding drilling tool, wherein said connecting rod adopts the round steel pipe of more piece hollow to compose in series, the equal diameters of more piece round steel pipe, each helix extruding-enlarging body is installed in a joint respectively and has on the round steel pipe of helical blade, adopts six side's snap joints to link to each other between each pitch circle steel pipe.
The utility model adjustable multiple coil extruding and expanding drilling tool, the top of wherein said connecting rod is provided with reverse extruding expanding body coaxially, oppositely extruding expanding body is the truncated cone-shaped that top end diameter is little, the bottom diameter is big, oppositely the bottom of extruding expanding body links to each other with the top of the helix extruding-enlarging body that is positioned at topmost, the top of the lateral wall of described connecting rod and reverse extruding expanding body is provided with the rotation direction reverse acting spiral squeezed blade opposite with the rotation direction of described helical blade, helical blade is the uniform pitch helical blade, and the edge of helical blade is welded with a plurality of alloy cutting teeths.
The utility model adjustable multiple coil extruding and expanding drilling tool, the top of wherein said connecting rod is provided with elongated helical blade, or adopts the mode of no helical blade, and the helix of the cross-sectional edge of described helix extruding-enlarging body is spiral of Archimedes or log spiral.
The utility model adjustable multiple coil extruding and expanding drilling tool, the middle part of wherein said drill end is weldingly connected with the bottom of guiding slip casting cover, guiding slip casting cover can be inserted in the hole of described connecting rod bottom slidably, the sidewall of guiding slip casting cover is provided with several piling perfusion outlets, the outside that is positioned at described connecting rod on the edge of described drill end vertically is fixed with several guide pegs, the top of each guide peg is respectively arranged with limited bolt, be provided with guide peg by the hole with the corresponding position of guide peg on the described helical blade, the guide peg that each guide peg can pass respectively on the helical blade slidably passes through the hole.
The utility model adjustable multiple coil extruding and expanding drilling tool, the middle part that wherein said drill end is positioned at described guiding intrusion pipe is provided with the frustum of a cone or semicircle billiard table, drill bit has the fishtail type apex point, and the quantity of described helix extruding-enlarging body is 2-8, and the quantity of described guide peg is 2-4.
The utility model adjustable multiple coil extruding and expanding drilling tool, the edge of wherein said helical blade are welded with a plurality of alloy cutting teeths.
Compared with prior art, adjustable multiple coil extruding and expanding drilling tool of the present utility model has following advantage:
1. adjustable multiple coil extruding and expanding drilling tool of the present utility model, can utilize helical blade with gumbo in the incompressible soil layer and closely knit sand fragmentation, cut and be transported to carry out in the compressible soil layer squeezed, broken through the limitation that can't pass through thick gumbo layer or thick dense sand stratum of original short helix extruding-enlarging drill bit thus because of having only the soil compaction effect to cause, so it is compared with existing bidirectional helix closed extruding-enlarging aiguille, under same dynamic condition, same bore diameter and same drilling depth condition, have stronger the pore-forming ability that penetrates and wider ground adaptability.
2. adjustable multiple coil extruding and expanding drilling tool of the present utility model, owing to can be in series with a plurality of helix extruding-enlarging bodies coaxially in any position on connecting rod, so it has the squeezed function of multistage substep, by apex point piercing to the incompressible soil layer soil body of lower floor, broken, cutting, and helical blade is upwards carried the function that is cut the soil body, lower floor's gumbo or closely knit sand are transported to top compressible soil section layer by layer, and will carry the soil body that comes up compacted in the stake week of compressible soil layer by the set extruding expanding body of this interval, thereby effectively improved stake week and inter-pile soil body intensity, and increased substantially stake side soil frictional resistance and pile bearing capacity.
3. adjustable multiple coil extruding and expanding drilling tool of the present utility model, because elongated helical blade is adopted in the middle and lower part of connecting rod, and the helical blade external diameter equals expanded diameter, so by adopting the middle and lower part connecting rod section that will have helical blade to be higher than the method for groundwater table, solved in weak clay or sand stratum, since the groundwater table height, the hole problem of collapsing that short helix extruding-enlarging drill bit or half screw drilling tool may occur in the drilling and forming hole process.
4. adjustable multiple coil extruding and expanding drilling tool of the present utility model, its apex point that can glide has improved the drillability of drilling tool, also help piling such as chutable concrete and press filling smoothly by the apex point of hollow connecting rod and following gliding style, avoid the plugging phenomenon, in addition, can realize that also apex point repeatedly uses, and has reduced construction cost.
5. under same stratum, same stake footpath and same stake elongate member, with drilled pile, punching stake, revolve and dig stake or engineering piles type commonly used such as CFA stake is compared, the cylindrical squeezed castinplace pile that adjustable multiple coil extruding and expanding drilling tool of the present utility model is finished, have that bearing capacity is higher, settling amount is littler, cost is lower, energy consumption still less, remarkable advantage such as environmental protection is better.
6. adjustable multiple coil extruding and expanding drilling tool of the present utility model, also be applicable to the foundation treatment engineering field, the composite foundation that it implements to finish, than present the most frequently used CFG composite foundation, has higher bearing capacity, the vertical cylindrical solid that adds that its reason is to adopt the adjustable multiple coil extruding and expanding drilling tool construction to finish has higher bearing capacity of single pile, and reinforces intercolumniation soil strength between the cylinder because compacted effect and raising greatly.Therefore, adjustable multiple coil extruding and expanding drilling tool of the present utility model is specially adapted to the composite foundation engineering project of high-speed railway, speedway, high-rise building.
7. the suitable stratum of adjustable multiple coil extruding and expanding drilling tool of the present utility model is extensive, comprise backfill, sand, silt, silty clay, clay, loess, gravel soil, contain sand pebble soil and severely-weathered soil layer etc., be applicable to also that groundwater table is higher or have the stratum of flowing pressure.
8. adjustable multiple coil extruding and expanding drilling tool of the present utility model pile foundation, composite pile foundation and the composite foundation implementing to finish can be widely used in all kinds of engineerings of civil engineering different field, comprising: high-rise and superelevation layer residential houses engineering, public works, industrial premises engineering, traffic engineering, power engineering and Environmental Engineering etc.
Below in conjunction with drawings and Examples in detail the utility model is described in detail.
Description of drawings
Fig. 1 is the front view of structural representation of a kind of embodiment of adjustable multiple coil extruding and expanding drilling tool of the present utility model;
Fig. 2 is the sectional view in the cross section of Fig. 1;
Fig. 3 is the sectional view in the cross section of Fig. 1;
Fig. 4 is the front view of structural representation of the another kind of embodiment of adjustable multiple coil extruding and expanding drilling tool of the present utility model;
Fig. 5 is the sectional view in the cross section of Fig. 4;
Fig. 6 is the sectional view in the cross section of Fig. 4;
Fig. 7 is the front view of structural representation of another embodiment of adjustable multiple coil extruding and expanding drilling tool of the present utility model;
Fig. 8 is the front view of structural representation of another embodiment of adjustable multiple coil extruding and expanding drilling tool of the present utility model;
Fig. 9 does not have the main pseudosection of slip casting state for apex point is in;
Figure 10 glides for apex point is in and opens the main pseudosection that carries out the slip casting state.
The specific embodiment
As shown in Figure 1 and Figure 4, adjustable multiple coil extruding and expanding drilling tool of the present utility model, the connecting rod 1 that comprises hollow, the middle and lower part of the lateral wall of connecting rod 1 is provided with helical blade 2, helical blade 2 can be the uniform pitch helical blade, also can be the decreasing worm-pitch helical blade, and the edge of helical blade 2 is welded with a plurality of alloy cutting teeths 7, be used to improve creeping into and abrasion resistance of drilling tool, the bottom of connecting rod 1 is provided with drill bit 4.
Any position is in series with a plurality of helix extruding-enlarging bodies 3 coaxially on connecting rod 1, only schematically drawn 2 among the figure, its needed concrete quantity is determined according to the geological condition of job site, usually between 2-4, helix extruding-enlarging body 3 is between helical blade 2, and as shown in Figures 2 and 3, the edge of the cross section of each helix extruding-enlarging body 3 is a helix, the helix of the cross-sectional edge of helix extruding-enlarging body 3 is a spiral of Archimedes, or log spiral.The maximum outside diameter of each helix extruding-enlarging body 3 and minimum outer diameter can be as Fig. 4, Fig. 5 and the constant that is respectively shown in Figure 6, or as Fig. 1, Fig. 2 and shown in Figure 3 increasing gradually from bottom to top, the maximum outside diameter of each helix extruding-enlarging body 3 can be the external diameter that equals helical blade 2, or less than the external diameter of helical blade 2.
Above-mentioned connecting rod 1 adopts the round steel pipe of more piece hollow to compose in series, the equal diameters of more piece round steel pipe, and each helix extruding-enlarging body 3 is installed in a joint respectively and has on the round steel pipe of helical blade, adopts six side's snap joints to link to each other between each pitch circle steel pipe.
The difference of Fig. 7 and embodiment shown in Figure 8 and Fig. 1 and embodiment shown in Figure 4 is, its top at connecting rod 1 is provided with reverse extruding expanding body 13 coaxially, oppositely extruding expanding body 13 is the truncated cone-shaped that top end diameter is little, the bottom diameter is big, oppositely the bottom of extruding expanding body 13 links to each other with the top of the helix extruding-enlarging body 3 that is positioned at topmost, and the lateral wall of the top of connecting rod 1 and reverse extruding expanding body 13 is provided with the squeezed blade 5 of the rotation direction reverse acting spiral opposite with the rotation direction of described helical blade 2.
As Fig. 9 and shown in Figure 10, the middle part on drill bit 4 tops is weldingly connected with the bottom of guiding slip casting cover 8, guiding slip casting cover 8 can be inserted in the hole of connecting rod 1 bottom slidably, if the sidewall of guiding slip casting cover 8 is provided with 2 piling perfusion outlets, piling perfusion outlet is used for injecting the fluidised form piling to boring, the outside that is positioned at connecting rod 1 on the edge on drill bit 4 tops vertically is fixed with 2 guide pegs 9, the quantity of guide peg 9 also can be 3 or 4, the top of each guide peg 9 is respectively arranged with limited bolt, be provided with guide peg by the hole with guide peg 9 corresponding positions on the helical blade 2, the guide peg that each guide peg 9 can pass respectively on the helical blade 2 slidably passes through the hole.The middle part that drill bit 4 tops are positioned at guiding intrusion pipe 8 is provided with the frustum of a cone or semicircle billiard table 12, and drill bit 4 has the fishtail type apex point.In work progress, when needs inject piling in boring, can utilize tremie in the connecting rod 1 of hollow, to inject piling, utilize the pressure of perfusion piling to move downward together with guiding intrusion pipe 8 and guide peg 9 by drill bit 4, piling perfusion outlet on the guiding guiding intrusion pipe 8 is communicated with boring, and piling is pressed in the boring by piling perfusion outlet.The effect of the frustum of a cone or semicircle billiard table 12 is to allow the fluidised form piling not deposit in guiding intrusion pipe 8.
The job practices of adjustable multiple coil extruding and expanding drilling tool of the present utility model comprises following construction sequence:
1) according to engineering place formation characteristics, groundwater level depth, at first determine to adopt stake of complete soil compaction type or the stake of part soil compaction type, and then the external diameter of the helical blade 2 of the diameter of definite helix extruding-enlarging body 3 and pattern, spiral drill and the external diameter of hollow connecting rod 1, according to the compressive features of vertical different depth soil layer, each helix extruding-enlarging body 3 is installed again at the select location place of connecting rod 1; In addition, determine according to groundwater level depth whether the top of connecting rod 1 adopts reverse extruding expanding body 13 and the squeezed blade 5 of reverse acting spiral, or helical blade 2 is extended to the top of connecting rod 1, or do not establish helical blade on the top of connecting rod 1.
2) piling pile work drilling machine is in place according to known method, as to be ready to concrete pump and will to pour into.Piling is a kind of in the pilings such as concrete piling, CFG material, tailings mortar piling or cement slag piling.
3) after pile work drilling machine is in place, start pile work drilling machine and apply clockwise moment of torsion and downward axial compression, utilize the downward rotary drill squeezed hole of adjustable multiple coil extruding and expanding drilling tool, in boring procedure, the soil body in the incompressible hardpan that is come out by rotary drill, do screw from bottom to top and be transported to compressible soil section layer by layer by helical blade 2, subsequently this part soil body be set at compressible soil layer by layer one or more levels helix extruding-enlarging body 3 of section all clamp-on in the hole week side soil body, form complete soil compaction type stake hole, perhaps the part soil body is squeezed in all side soil bodys in a hole, another part soil body is continued transported to the face of land by helical blade 2, form part soil compaction type stake hole, the squeezed hole process of adjustable multiple coil extruding and expanding drilling tool is till reaching the design hole depth, and this stage is called the first step stake hole squeezed stage of machinery.
4) after squeezed the finishing of first step stake hole machinery, start the power that axially lifts that pile work drilling machine applies clockwise moment of torsion and makes progress, make adjustable multiple coil extruding and expanding drilling tool rotate up motion, in rotating up squeezed lifting process, the having the squeezed blade 5 of reverse acting spiral and reverse extruding expanding body 13 and the soil body that collapses in the stake hole, top can be clamp-oned once more in hole week side soil body of connecting rod 1 top, thereby form the cylindrical stake of complete soil compaction type, this stage was called for second a step stake hole squeezed stage of machinery, this work progress last till drilling tool be rotated rise on the face of land till.
5) on beginning, adjustable multiple coil extruding and expanding drilling tool revolves in the squeezed lifting, start concrete pump, in finishing squeezed stake hole, carry out piling continuously and press filling, this stage was called for the 3rd stake hole squeezed stage of pressure in step, the 3rd a step hole pressure is squeezed to be to carry out under the pressure effect of concrete pump, continuous pressure by piling is squeezed, can make the pile cutoff of having finished the filling of fluidised form piling pressure can guarantee that expanded diameter adheres to specification, this hole pressure squeezing process will last till that piling press to irritate till the design elevation of stake top, so far form columniform complete soil compaction type castinplace pile or part soil compaction type castinplace pile.
6), can in just finishing the helix extruding-enlarging castinplace pile pile body of perfusion, insert reinforcing cage, tendon or shaped steel according to known method according to designing requirement.
Embodiment recited above is described preferred implementation of the present utility model; be not that the utility model scope is limited; design under the spiritual prerequisite not breaking away from the utility model; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection domain of claims of the present utility model.
Claims (6)
1. adjustable multiple coil extruding and expanding drilling tool, the connecting rod (1) that comprises hollow, the middle and lower part of the lateral wall of connecting rod (1) is provided with helical blade (2), the bottom of connecting rod (1) is provided with drill bit (4), it is characterized in that the upward coaxial a plurality of helix extruding-enlarging bodies (3) that are in series with of described connecting rod (1), helix extruding-enlarging body (3) is positioned between the described helical blade (2), the edge of the cross section of each helix extruding-enlarging body (3) is a helix, the maximum outside diameter of each helix extruding-enlarging body (3) and minimum outer diameter are respectively constant or increase gradually from bottom to top, and the maximum outside diameter of each helix extruding-enlarging body (3) is equal to or less than the external diameter of described helical blade (2).
2. adjustable multiple coil extruding and expanding drilling tool as claimed in claim 1, it is characterized in that: described connecting rod (1) adopts the round steel pipe of more piece hollow to compose in series, the equal diameters of more piece round steel pipe, each helix extruding-enlarging body (3) is installed in a joint respectively and has on the round steel pipe of helical blade, adopts six side's snap joints to link to each other between each pitch circle steel pipe.
3. adjustable multiple coil extruding and expanding drilling tool as claimed in claim 2, it is characterized in that: the top of described connecting rod (1) is provided with reverse extruding expanding body (13), oppositely extruding expanding body (13) is that top end diameter is little, the truncated cone-shaped that the bottom diameter is big, oppositely the bottom of extruding expanding body (13) links to each other with the top of the helix extruding-enlarging body (3) that is positioned at topmost, the top of the lateral wall of described connecting rod (1) and reverse extruding expanding body (13) is provided with the rotation direction reverse acting spiral squeezed blade (5) opposite with the rotation direction of described helical blade (2), helical blade (2) is the uniform pitch helical blade, and the edge of helical blade (2) is welded with a plurality of alloy cutting teeths (7).
4. adjustable multiple coil extruding and expanding drilling tool as claimed in claim 3, it is characterized in that: the top of described connecting rod (1) is provided with elongated helical blade (2), and the helix of the cross-sectional edge of described helix extruding-enlarging body (3) is spiral of Archimedes or log spiral.
5. adjustable multiple coil extruding and expanding drilling tool as claimed in claim 4, it is characterized in that: the middle part on described drill bit (4) top is weldingly connected with the bottom of guiding slip casting cover (8), guiding slip casting cover (8) can be inserted in the hole of described connecting rod (1) bottom slidably, the sidewall of guiding slip casting cover (8) is provided with several piling perfusion outlets, the outside that is positioned at described connecting rod (1) on the edge on described drill bit (4) top vertically is fixed with several guide pegs (9), the top of each guide peg (9) is respectively arranged with limited bolt, described helical blade (2) is gone up and the corresponding position of guide peg (9) is provided with guide peg by the hole, and the guide peg that each guide peg (9) can pass respectively on the helical blade (2) slidably passes through the hole.
6. adjustable multiple coil extruding and expanding drilling tool as claimed in claim 5, it is characterized in that: the middle part that described drill bit (4) top is positioned at described guiding intrusion pipe (8) is provided with the frustum of a cone or semicircle billiard table (12), drill bit (4) has the fishtail type apex point, the quantity of described helix extruding-enlarging body (3) is 2-8, and the quantity of described guide peg (9) is 2-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201910425U CN201650154U (en) | 2010-05-14 | 2010-05-14 | Adjustable multi-stage helical extruding type drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201910425U CN201650154U (en) | 2010-05-14 | 2010-05-14 | Adjustable multi-stage helical extruding type drilling tool |
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| CN201650154U true CN201650154U (en) | 2010-11-24 |
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| CN2010201910425U Expired - Fee Related CN201650154U (en) | 2010-05-14 | 2010-05-14 | Adjustable multi-stage helical extruding type drilling tool |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812976A (en) * | 2010-05-14 | 2010-08-25 | 中冶建筑研究总院有限公司 | Adjustable multiple coil extruding and expanding drilling tool |
| CN104631443A (en) * | 2014-12-19 | 2015-05-20 | 王继忠 | Construction method for composite foundation |
| CN106638580A (en) * | 2016-11-11 | 2017-05-10 | 山东威建岩土科技有限公司 | Method for forming pile by forming hole through spiral soil squeezing and following up poured concrete through sleeve |
-
2010
- 2010-05-14 CN CN2010201910425U patent/CN201650154U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812976A (en) * | 2010-05-14 | 2010-08-25 | 中冶建筑研究总院有限公司 | Adjustable multiple coil extruding and expanding drilling tool |
| CN101812976B (en) * | 2010-05-14 | 2013-05-15 | 中冶建筑研究总院有限公司 | Adjustable multiple coil extruding and expanding drilling tool |
| CN104631443A (en) * | 2014-12-19 | 2015-05-20 | 王继忠 | Construction method for composite foundation |
| CN106638580A (en) * | 2016-11-11 | 2017-05-10 | 山东威建岩土科技有限公司 | Method for forming pile by forming hole through spiral soil squeezing and following up poured concrete through sleeve |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20101124 Termination date: 20140514 |