CN204175187U - With the long spire stake machine of expander - Google Patents
With the long spire stake machine of expander Download PDFInfo
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- CN204175187U CN204175187U CN201420619349.9U CN201420619349U CN204175187U CN 204175187 U CN204175187 U CN 204175187U CN 201420619349 U CN201420619349 U CN 201420619349U CN 204175187 U CN204175187 U CN 204175187U
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- hinge arm
- auger stem
- grouting pipe
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Abstract
The utility model discloses a kind of long spire stake machine with expander, feature is that the upper end of auger stem is provided with core barrel, second slew gear is connected with core barrel through bearing assembly, it is at least provided with two chambeies that work alone, symmetrical lug on auger stem, one end respectively through bearing pin and lower hinge arm on lug is hinged, lower hinge arm through hinge and upper hinge arm hinged, upper hinge arm upper end is connected with the gathering sill be fixed on auger stem through bearing pin, upper hinge arm is connected with telescopic arm, pivoted arm is respectively equipped with drilling tool, auger stem side is provided with Grouting Pipe, its upper end is connected with slurry source, lower end and the plasma resistance plug of Grouting Pipe are conflicted, bottom valve plate is buckled on augers delivery outlet, bottom valve plate side respectively through bearing pin and gripper shoe and junction plate hinged, gripper shoe is connected with augers concrete pipe, the tube wall of the junction plate other end and Grouting Pipe is hinged, auger stem is provided with Grouting Pipe lifting gear, the utility model has simple to operate, operating efficiency is high, improve stability and the shock resistance of pile foundation.
Description
Technical field
The utility model relates to the pile foundation construction equipment of building, the long spire stake machine that specifically a kind of applicable long spire pile foundation construction is locally expanded.
Background technology
As everyone knows, long spire stake machine is the common equipment of pile foundation construction, it comprises hydraulic walking, crawler pile frame and drilling system two parts, pile frame is primarily of top pulleys group, column, hound, chassis, walking mechanism, hoisting mechanism, pulpit, hydraulic system and electrical system composition. drilling system comprises unit head and drilling tool, output shaft-the auger stem of unit head and augers are hollow type, unit head bottom is provided with slew gear, to inject concrete in stake holes, augers is divided into single head list spiral shell, double end list spiral shell, the two spiral shell of double end, drilling tool is the cutter that unit head bottom is inlayed, its advantage is simple to operate, easy to use, drilling efficiency is high, but this long spire stake machine can only stamp lower isometrical pile foundation, in particular locality, specific location, in order to increase the supporting capacity that pile foundation is executed, shock resistance, need the not isometrical up and down of pile foundation, the footpath, the end of pile foundation is particularly needed to increase, existing long spire stake machine cannot realize.
Summary of the invention
The purpose of this utility model is the deficiency solving long spire stake machine, provides a kind of long spire stake machine of simple to operate, operating efficiency is high, pile foundation local diameter is controlled band expander.
The utility model solves the technical scheme that its technical problem adopts.
A kind of long spire stake machine with expander, comprise pile frame and drilling system two parts, pile frame is primarily of top pulleys group, column, hound, chassis, walking mechanism, hoisting mechanism, pulpit, hydraulic system and electrical system composition. drilling system comprises unit head auger stem and augers, unit head, auger stem and augers are hollow type, unit head bottom is provided with injects concrete slew gear in stake holes, auger stem, augers is through being connected, the lower surface of augers is provided with drilling tool, it is characterized in that the upper end of auger stem is provided with the core barrel be fixedly connected with auger stem, second slew gear is connected with core barrel through bearing assembly, second slew gear is at least provided with two independently working chambers, auger stem is provided with lug, lug is made up of the left lug of symmetry and right lug, left lug and right lug are hinged through one end of bearing pin and lower hinge arm respectively, the lower hinge arm other end is hinged through hinge and upper hinge arm lower end, upper hinge arm upper end is connected with the gathering sill be fixed on auger stem through bearing pin, upper hinge arm upper end is connected with the telescopic arm of hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, upper hinge arm and lower hinge arm are respectively equipped with expanding drilling tool, the side of auger stem is provided with Grouting Pipe, the upper end of Grouting Pipe is connected with an outlet of the second slew gear, its import is connected with slurry source through grouting pipe, the lower end of Grouting Pipe is provided with plasma resistance plug, bottom valve plate is buckled on the delivery outlet of augers concrete pipe, bottom valve plate side respectively through bearing pin and gripper shoe and junction plate hinged, gripper shoe is connected with augers concrete pipe, the tube wall of the junction plate other end and Grouting Pipe is hinged, auger stem is provided with Grouting Pipe lifting gear.
Slurry pipe lifting gear described in the utility model can be hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, gear can also be adopted, the kind of drive that tooth bar adds motor, carry out slip casting with hoisting grouting pipe and keep off native wall built-up or injection concrete pile.
The utility model can be provided with at least two lugs in compartment of terrain on auger stem, lug is by the left lug of symmetry and right lug composition, left lug and right lug are hinged through one end of bearing pin and lower hinge arm respectively, the lower hinge arm other end is hinged through hinge and upper hinge arm lower end, upper hinge arm upper end is connected with the gathering sill be fixed on auger stem through bearing pin, upper hinge arm upper end is connected with push-and-pull pipe respectively, push-and-pull pipe upper end is connected with the telescopic arm of hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, upper hinge arm and lower hinge arm are respectively equipped with expanding drilling tool, to arrange large diameter stake holes at the different depth of pile body.
Gathering sill is provided with directly over left lug described in the utility model and right lug, gathering sill can be open slot also can be the slotted eye that push-and-pull pipe passes, left lug and right lug parallel with the axis of auger stem with the line of gathering sill, make expansion or contraction under the driving of driving cylinder telescopic arm on upper hinge arm or lower hinge arm, push-and-pull pipe can be moved up and down, to carry out expanding operation.
When the present invention uses, augers rotates through unit head and auger stem and applies downward pressure, to realize piling work, in piling process, Grouting Pipe is pressed in plasma resistance beyond the Great Wall, under the pressure of Grouting Pipe, the delivery outlet of augers concrete pipe seals by bottom valve plate, continue to rotate when stake holes completes rear screw drilling rod, by slurry source, a working chamber of the second slew gear is to Grouting Pipe slip casting, plasma resistance plug is opened under the impact force action of slurries, Grouting Pipe starts to pile grouting, whitewashing amount is 2-4 cubic meter, regulate mud balance 1:1.5, promote upper hinge arm by hydraulic jack or Telescopic-cylinder arm while slip casting to move down, make upper hinge arm, the spademan of lower hinge arm and auger stem shape triangular in shape, expanding drilling tool on upper hinge arm and lower hinge arm carries out ream operation to stake bottom outlet, with the elongation of hydraulic jack or Telescopic-cylinder arm, expanding size constantly expands, pile foundation counter bore diameter can operate hydraulic jack by Artificial Control or cylinder realizes, and pass through lower hinge arm, upper hinge arm and on drilling tool to mud stirring to after evenly, auger stem stops the rotation, lower hinge arm and upper hinge arm is regained by telescopic arm, again by slurry pipe lifting gear hoisting grouting pipe, bottom valve plate is opened under the pulling force of Grouting Pipe and concrete pressure or impact force action, in stake holes, concrete is injected continuously by the concrete shaft in auger stem, mud in stake holes rises because of light specific gravity along with concrete perfusion, discharge stake holes, adopt vibrator that finished product reinforcing cage is inserted filling to have in concrete stake holes to projected depth pile.
When adopting many group expanders, during work, augers through unit head and auger stem rotation and apply downward pressure, in piling process, Grouting Pipe is pressed in plasma resistance beyond the Great Wall, under the pressure of Grouting Pipe, the delivery outlet of augers concrete pipe seals by bottom valve plate, simultaneously by slurry source, a working chamber of the second slew gear is to Grouting Pipe slip casting, plasma resistance plug is opened under the impact force action of slurries, Grouting Pipe starts to stake holes slip casting, regulate mud balance 1:1.2-1.5, continue to rotate when stake holes completes rear screw drilling rod, moved down by group upper hinge arm more than hydraulic jack or Telescopic-cylinder arm or the promotion of push-and-pull pipe, make upper hinge arm, lower hinge arm and auger stem in organizing triangle spademan more, expanding drilling tool on the upper hinge arm often organized and lower hinge arm carries out ream operation to the multiple position of stake holes simultaneously, with the elongation of hydraulic jack or Telescopic-cylinder arm, the diameter of pile foundation constantly expands, pile foundation counter bore diameter can operate hydraulic jack by Artificial Control or cylinder realizes, said process Grouting Pipe is all the time to stake holes slip casting, and pass through lower hinge arm, upper hinge arm and on drilling tool to mud stirring to evenly, auger stem stops the rotation, Grouting Pipe stops to stake holes slip casting, regained by telescopic arm again and often organize lower hinge arm and upper hinge arm, again by slurry pipe lifting gear hoisting grouting pipe, bottom valve plate is opened under the pulling force of Grouting Pipe and concrete pressure or impact force action, in stake holes, concrete is injected continuously by the concrete shaft in auger stem, mud in stake holes rises because of light specific gravity along with concrete perfusion, discharge stake holes, finally adopt vibrator that finished product reinforcing cage is inserted filling to have in concrete stake holes to projected depth pile.
The utility model can carry out locally expanded operation for different landforms on the basis of cylinder stake, has novel structure, simple to operate, operating efficiency is high, substantially increases the stability of pile foundation and shock resistance.
Accompanying drawing explanation
Fig. 1 is a kind of operating diagram of the present utility model.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is the structural representation of the second slew gear in the utility model.
Fig. 4 is the close-up schematic view of the second slew gear in the utility model.
Fig. 5 is a kind of structural representation of bottom in the utility model.
Fig. 6 is a kind of schematic diagram of bit head in the utility model.
Fig. 7 is the sectional view of Fig. 6.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in the figure: a kind of long spire stake machine with expander, comprise pile frame and drilling system two parts, pile frame is primarily of top pulleys group, column, hound, chassis, walking mechanism, hoisting mechanism, pulpit, hydraulic system and electrical system composition, drilling system comprises unit head, auger stem and drilling tool, unit head, auger stem and augers are hollow type, unit head is provided with and injects concrete slew gear in stake holes, auger stem is connected with augers through augers joint or flange, the lower surface of augers is provided with drilling tool, the structure of above-mentioned each ingredient and the interconnected relationship between them same as the prior art, this does not repeat, of the present utility modelly be characterised in that the upper end of auger stem 1 is provided with the core barrel 2 be fixedly connected with auger stem 1, second slew gear is connected with core barrel 2 through bearing assembly 3, second slew gear is at least provided with two independently working chambers 4, the above-mentioned structure of each ingredient and the interconnected relationship between them identical with slew gear of the prior art, this does not repeat, auger stem 1 is provided with expander, expander is provided with lug 5, lug 5 is made up of the left lug of symmetry and right lug, left lug and right lug are hinged through one end of bearing pin and lower hinge arm 6 respectively, lower hinge arm 6 other end is hinged through hinge and upper hinge arm 7 lower end, upper hinge arm 7 upper end is connected with the gathering sill 8 be fixed on auger stem through bearing pin, upper hinge arm 7 upper end is connected with the telescopic arm 9 of hydraulic jack or cylinder, the conduit of hydraulic jack or cylinder with one of the second slew gear independently exit from do be connected, its import is connected with hydraulic power source or source of the gas with through conduit, its import refers to the import in the chamber that works alone of the conduit of hydraulic jack or cylinder and the connection of the second slew gear, upper hinge arm 7 and lower hinge arm 6 are respectively equipped with expanding drilling tool 10, drilling tool 10 is generally connected in vertical with lower hinge arm 6 with upper hinge arm 7, the utility model can be provided with at least two lugs 5 in compartment of terrain on auger stem 1, lug 5 is by the left lug of symmetry and right lug composition, left lug and right lug are hinged through one end of bearing pin and lower hinge arm 6 respectively, lower hinge arm 6 other end is hinged through hinge and upper hinge arm 7 lower end, upper hinge arm 7 upper end is connected with the gathering sill 8 be fixed on auger stem 1 through bearing pin, upper hinge arm 7 upper end can be connected with the telescopic arm 9 of hydraulic jack or cylinder respectively, that is the telescopic arm 9 being provided with multiple hydraulic jack or cylinder is connected, also pull bar or push-and-pull pipe can be provided with, because tubular rod has more flexing resistance, push-and-pull pipe is adopted so general, upper hinge arm 7 upper end can be connected with push-and-pull pipe respectively, push-and-pull pipe upper end is connected with the telescopic arm 9 of hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with the outlet in the chamber that works alone of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, upper hinge arm and lower hinge arm are respectively equipped with expanding drilling tool, to arrange large diameter stake holes at the different depth of pile body, ordinary circumstance has three lugs, be separately positioned on the bottom of auger stem, the middle part of auger stem and the top of auger stem, propeller blade directly over described left lug and right lug is provided with gathering sill, gathering sill is made up of open slot and the slotted eye of remaining silent, open slot is to make expansion or contraction under the driving of driving cylinder telescopic arm on upper hinge arm or lower hinge arm, push-and-pull pipe can be moved up and down, to carry out expanding operation, the slotted eye of remaining silent is in order to push-and-pull pipe passes, to transmit power, left lug and the right lug of lug 5 parallel with the axis of auger stem with the line of gathering sill, gathering sill is for upper hinge arm guiding is used, its structure and and upper hinge arm, the annexation of bearing pin is same as the prior art, this does not repeat, in addition, the side of auger stem 1 described in the utility model is provided with Grouting Pipe 12, the upper end of Grouting Pipe 12 is connected with the outlet of a working chamber of the second slew gear, its import is connected with ground slurry source through grouting pipe, the lower end of Grouting Pipe 12 is provided with plasma resistance plug, the grout outlet of Grouting Pipe 12 seals by plasma resistance plug, play sealing process, Grouting Pipe 12 is entered to prevent the silt bored in stake holes operation process, bottom valve plate 11 is buckled on the delivery outlet of the augers concrete pipe 13 be connected with auger stem, bottom valve plate 11 side is hinged through bearing pin and gripper shoe 14 and junction plate 15 respectively, gripper shoe 14 is connected with augers concrete pipe 13, the tube wall of junction plate 15 other end and Grouting Pipe 12 is hinged, auger stem 1 is provided with Grouting Pipe lifting gear, to form the open and close mechanism of bottom valve plate, when bore operation, bottom valve plate is pressed against on the delivery outlet of augers concrete pipe 13 by Grouting Pipe 12, when Grouting Pipe lifting gear hoisting grouting pipe 12 rises, bottom valve plate is opened under the pulling force of Grouting Pipe with under concrete pressure or impact force and Action of Gravity Field, concrete is noted in stake holes, slurry pipe lifting gear described in the utility model can be hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, gear can also be adopted, tooth bar adds the kind of drive of motor, carry out slip casting with hoisting grouting pipe and keep off native wall built-up or injection concrete pile, said structure and connect same as the prior art, this does not repeat.
The utility model is when auger stem lower end is provided with expander, during its work, augers rotates through unit head and auger stem and applies downward pressure, to realize piling work, in piling process, Grouting Pipe is pressed in plasma resistance beyond the Great Wall, under the pressure of Grouting Pipe, the delivery outlet of augers concrete pipe seals by bottom valve plate, continue to rotate when stake holes completes rear screw drilling rod, by slurry source, a working chamber of the second slew gear is to Grouting Pipe slip casting, plasma resistance plug is opened under the impact force action of slurries, Grouting Pipe starts to pile grouting, whitewashing amount is 2-4 cubic meter, regulate mud balance 1:1.5, promote upper hinge arm by hydraulic jack or Telescopic-cylinder arm while slip casting to move down, make upper hinge arm, the spademan of lower hinge arm and auger stem shape triangular in shape, expanding drilling tool on upper hinge arm and lower hinge arm carries out ream operation to stake bottom outlet, with the elongation of hydraulic jack or Telescopic-cylinder arm, expanding size constantly expands, pile foundation counter bore diameter can operate hydraulic jack by Artificial Control or cylinder realizes, and pass through lower hinge arm, upper hinge arm and on drilling tool to mud stirring to after evenly, auger stem stops the rotation, lower hinge arm and upper hinge arm is regained again by telescopic arm, again by slurry pipe lifting gear hoisting grouting pipe, bottom valve plate is opened under the pulling force of Grouting Pipe and concrete pressure or impact force action, in stake holes, concrete is injected continuously by the concrete shaft in auger stem, mud in stake holes rises because of light specific gravity along with concrete perfusion, discharge stake holes, finally adopt vibrator that finished product reinforcing cage is inserted filling to have in concrete stake holes to projected depth pile.
When auger stem being at least provided with two expanders, during its work, first augers through unit head and auger stem rotation and apply downward pressure, in piling process, Grouting Pipe is pressed in plasma resistance beyond the Great Wall, under the pressure of Grouting Pipe, the delivery outlet of augers concrete pipe seals by bottom valve plate, simultaneously by slurry source, a working chamber of the second slew gear is to Grouting Pipe slip casting, plasma resistance plug is opened under the impact force action of slurries, Grouting Pipe starts to stake holes slip casting, regulate mud balance 1:1.2-1.5, continue to rotate when stake holes completes rear screw drilling rod, moved down by group upper hinge arm more than hydraulic jack or Telescopic-cylinder arm or the promotion of push-and-pull pipe, make upper hinge arm, lower hinge arm and auger stem in organizing triangle spademan more, expanding drilling tool on the upper hinge arm often organized and lower hinge arm carries out ream operation to the multiple position of stake holes simultaneously, with the elongation of hydraulic jack or Telescopic-cylinder arm, the diameter of pile foundation constantly expands, pile foundation counter bore diameter can operate hydraulic jack by Artificial Control or cylinder realizes, said process Grouting Pipe is all the time to stake holes slip casting, and pass through lower hinge arm, upper hinge arm and on drilling tool to mud stirring to evenly, auger stem stops the rotation, Grouting Pipe stops to stake holes slip casting, regained by telescopic arm again and often organize lower hinge arm and upper hinge arm, again by slurry pipe lifting gear hoisting grouting pipe, bottom valve plate is opened under the pulling force of Grouting Pipe and concrete pressure or impact force action, in stake holes, concrete is injected continuously by the concrete shaft in auger stem, mud in stake holes rises because of light specific gravity along with concrete perfusion, discharge stake holes, finally adopt vibrator that finished product reinforcing cage is inserted filling to have in concrete stake holes to projected depth pile.
The utility model can carry out locally expanded operation for different landforms on the basis of cylinder stake, has novel structure, simple to operate, operating efficiency is high, substantially increases the stability of pile foundation and shock resistance.
Claims (5)
1. the long spire stake machine with expander, comprise pile frame and drilling system two parts, pile frame is primarily of top pulleys group, column, hound, chassis, walking mechanism, hoisting mechanism, pulpit, hydraulic system and electrical system composition. drilling system comprises unit head auger stem and augers, unit head, auger stem and augers are hollow type, unit head bottom is provided with injects concrete slew gear in stake holes, auger stem, augers is through being connected, the lower surface of augers is provided with drilling tool, it is characterized in that the upper end of auger stem is provided with the core barrel be fixedly connected with auger stem, second slew gear is connected with core barrel through bearing assembly, second slew gear is at least provided with two independently working chambers, auger stem is provided with lug, lug is made up of the left lug of symmetry and right lug, left lug and right lug are hinged through one end of bearing pin and lower hinge arm respectively, the lower hinge arm other end is hinged through hinge and upper hinge arm lower end, upper hinge arm upper end is connected with the gathering sill be fixed on auger stem through bearing pin, upper hinge arm upper end is connected with the telescopic arm of hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, upper hinge arm and lower hinge arm are respectively equipped with expanding drilling tool, the side of auger stem is provided with Grouting Pipe, the upper end of Grouting Pipe is connected with an outlet of the second slew gear, its import is connected with slurry source through grouting pipe, the lower end of Grouting Pipe is provided with plasma resistance plug, bottom valve plate is buckled on the delivery outlet of augers concrete pipe, bottom valve plate side respectively through bearing pin and gripper shoe and junction plate hinged, gripper shoe is connected with augers concrete pipe, the tube wall of the junction plate other end and Grouting Pipe is hinged, auger stem is provided with Grouting Pipe lifting gear.
2. a kind of long spire stake machine with expander according to claim 1, it is characterized in that Grouting Pipe lifting gear is hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, and its import is connected with hydraulic power source or source of the gas with through conduit.
3. a kind of long spire stake machine with expander according to claim 1, is characterized in that the kind of drive that Grouting Pipe lifting gear is employing gear, tooth bar adds motor.
4. a kind of long spire stake machine with expander according to claim 1, it is characterized in that on auger stem, compartment of terrain is provided with at least two lugs, lug is by the left lug of symmetry and right lug composition, left lug and right lug are hinged through one end of bearing pin and lower hinge arm respectively, the lower hinge arm other end is hinged through hinge and upper hinge arm lower end, upper hinge arm upper end is connected with the gathering sill be fixed on auger stem through bearing pin, upper hinge arm upper end is connected with push-and-pull pipe respectively, push-and-pull pipe upper end is connected with the telescopic arm of hydraulic jack or cylinder, hydraulic jack or cylinder conduit are connected with an outlet of the second slew gear, its import is connected with hydraulic power source or source of the gas with through conduit, upper hinge arm and lower hinge arm are respectively equipped with expanding drilling tool.
5. a kind of long spire stake machine with expander according to claim 1, it is characterized in that being provided with gathering sill directly over left lug and right lug, the slotted eye that gathering sill divides open slot and push-and-pull pipe to pass, left lug and right lug parallel with the axis of auger stem with the line of gathering sill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420619349.9U CN204175187U (en) | 2014-10-24 | 2014-10-24 | With the long spire stake machine of expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420619349.9U CN204175187U (en) | 2014-10-24 | 2014-10-24 | With the long spire stake machine of expander |
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| Publication Number | Publication Date |
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| CN204175187U true CN204175187U (en) | 2015-02-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404951A (en) * | 2014-10-24 | 2015-03-11 | 威海市水利岩土工程有限公司 | Long spiral pile machine with expanding device and pile forming method |
| CN104832094A (en) * | 2015-05-08 | 2015-08-12 | 黑龙江中古建筑节能科技股份有限公司 | Long auger drilling and base-expanding complete device and reaming method |
| JP2021139272A (en) * | 2020-03-05 | 2021-09-16 | 浙大城市学院 | Drilling machine used in pile foundation works |
-
2014
- 2014-10-24 CN CN201420619349.9U patent/CN204175187U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404951A (en) * | 2014-10-24 | 2015-03-11 | 威海市水利岩土工程有限公司 | Long spiral pile machine with expanding device and pile forming method |
| CN104832094A (en) * | 2015-05-08 | 2015-08-12 | 黑龙江中古建筑节能科技股份有限公司 | Long auger drilling and base-expanding complete device and reaming method |
| CN104832094B (en) * | 2015-05-08 | 2017-12-01 | 黑龙江中古建筑节能科技股份有限公司 | Long auger base expanding and base expanding complexes and expanding method |
| JP2021139272A (en) * | 2020-03-05 | 2021-09-16 | 浙大城市学院 | Drilling machine used in pile foundation works |
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