CN101280562A - Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer or sand layer - Google Patents
Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer or sand layer Download PDFInfo
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- CN101280562A CN101280562A CNA2008100183543A CN200810018354A CN101280562A CN 101280562 A CN101280562 A CN 101280562A CN A2008100183543 A CNA2008100183543 A CN A2008100183543A CN 200810018354 A CN200810018354 A CN 200810018354A CN 101280562 A CN101280562 A CN 101280562A
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Abstract
The invention relates to a construction method which can be constructed at a gravel layer, a round gravel layer, a breccia layer, a sand layer or a strong weathered mudstone and can ensure the constructive pile length to meet the design requirements. The construction method is characterized in that: Firstly, an inner pipe with an opening at the bottom is arranged inside an outer pipe with an opening at the bottom, and then the base of a heavy punch is arranged on a round steel plate at the top of the inner pipe. Secondly, the heavy punch is started to hammer the round steel plate at the top of the inner pipe, so that the inner pipe and the outer pipe can be sunk into the bed soil; when the cast-in-place pile is difficult to be implemented, but the constructive pile length can not meet the design requirements, the inner pipe is drawn out, and the filler crushed inside the inner pipe in cast-in-place pile is cleared, and then the inner pipe is inserted into the outer pipe again, after that, the heavy punch is restarted to hammer the round steel plate at the top of the inner pipe so as to make the inner pipe and the outer pipe sink into the bed soil, such process is repeatedly. Thirdly, the inner pipe is drawn out, and a steel cage is arranged into the outer pipe, and the outer pipe is poured with concrete. Fourthly, the surface of the concrete inside the outer pipe is pressed by the inner pipe in which the filler is cleared, and then the outer pipe is pulled out in uniform speed slowly. Fifthly, when all the outer pipes are pulled out, the pipe is vibrated by a vibrating spear. The filler which is squeezed into the inner pipe is cleared repeatedly, thereby the depth of the cast-in-place pile can meet the designed pile length.
Description
Technical field
The present invention relates to a kind of concrete filling pile construction method, particularly a kind of in boulder bed, gravel layer, dust layer or layer of sand, construct and can guarantee the job practices that construction stake length adheres to specification.
Technical background
Application for a patent for invention " at boulder bed; the construction tube-sinking cast-in-situ pile guarantees the job practices that stake is long in the layer of sand " (number of patent application: 2007101885943) disclose a kind of in geology such as boulder bed, gravel layer, dust layer, layer of sand or severely-weathered mud stone the method for the compacted tube-sinking cast-in-situ pile of construction, but the natural strength ratio of this type of geology is higher, the immersed tube difficulty is big, tends to run into the immersed tube degree of depth and does not reach designing requirement.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art because at geology such as boulder bed, gravel layer, dust layer, layer of sand or severely-weathered mud stone soil intensity height, adopt the dual cover pipe construction of hammering to be difficult to guarantee the long shortcoming that adheres to specification of stake, therefore proposed a kind of that in boulder bed, gravel layer, dust layer, layer of sand or severely-weathered mud stone, construct and can guarantee the job practices that construction stake length adheres to specification, the interior pipe bottom of adopting in the construction is an open type, utilize the inserts in the pipe in clamp-oning when removing immersed tube repeatedly, thereby guarantee the immersed tube degree of depth.
Technical scheme of the present invention is achieved in that the construction tube-sinking cast-in-situ pile guarantees the job practices that stake is long in boulder bed, layer of sand, concrete construction sequence is: first: the interior pipe of bottom end opening is placed in the outer tube of bottom end opening, and the base of weight is put on the garden shape steel plate on top on inner pipe; Second: start weight, pipe is gone up the garden shape steel plate on top in the hammering, inner and outer pipe is sunk in the stratum soil of boulder bed, garden gravel bed, dust layer, layer of sand or severely-weathered mud stone simultaneously, when the immersed tube difficulty but construction stake when reaching less than designing requirement, pipe in extracting out, inserts in clamp-oning during with immersed tube in the pipe is removed, repeat to insert interior pipe in the outer tube again, restart weight, the garden shape steel plate on pipe top in the hammering, inner and outer pipes is sunk in the geology soil simultaneously, so repeatedly, make the immersed tube degree of depth reach designing pile length; And the inner and outer pipes that guarantees last hammering ten times is used to in-degree less than 10cm.The 3rd: pipe in extracting out, in outer tube, pour into the pile body concrete, the concrete spouting height is extracted behind the soil layer top mark height and is adhered to specification and be as the criterion for guaranteeing outer tube; The the 4th: manage interior inserts in clamp-oning when removing immersed tube, and push down outer tube inner concrete surface, slowly at the uniform velocity extract outer tube with interior pipe; The the 5th: after treating that outer tube is all extracted, pile body is vibrated with vibrating head.If an electric vibration hammer is installed on the outer tube, can be saved the pile body step of vibrating.
The method of the inserts in clamp-oning when removing immersed tube in the pipe is with manually joining special tool, as iron hammer, crooked chisel or compact spiral are bored and are removed from interior pipe bottom, also can in interior pipe, dispose an electronic long screw auger, inserts in the pipe in clamp-oning is inwardly managed the upper end to be transmitted, thereby can reduce number of purge, improve effect.Inserts in it is removed in the pipe is identical with above method.
Long in order to guarantee construction stake, recycle in the hammer hidden pipe process and remove the inserts of clamp-oning in the interior pipe, make the immersed tube degree of depth reach designing requirement.If the inserts in clamp-oning for the last time in the pipe is closely knit stone or sand.Inserts in needn't removing again and clamp-on this moment in the pipe, the pipe bottom is sealed in can be considered.After then the hammer hidden pipe degree of depth reaches the designing pile length requirement, and the inner and outer pipes pile penetration that guarantees last hammering ten times is less than 10cm.Pipe pours into pile concrete in extracting out in outer tube.
During the hammer hidden pipe pore-forming, as if accompanying the boulder bed of thickness in the soil of chance stratum greater than one meter, layer or layer of sand are pressed and smooth in garden gravel bed, angle, utilize the inserts in managing in clamp-oning when removing immersed tube repeatedly to realize penetrating above hard interbedded layer in the immersed tube process, adhere to specification to guarantee the immersed tube degree of depth.
If what the inserts compactness in clamp-oning for the last time in the pipe did not guarantee immersed tube is used to in-degree less than 10cm, then to remove the inserts in the pipe in clamp-oning, a garden shape end socket steel plate is installed in interior pipe bottom then, the pipe bottom becomes closed in making, and the length of pipe is than the short 5-25cm of outer tube in guaranteeing, interior pipe hangs down the circular steel board diameter of end closure than the little 0.5-3cm of outer tube diameter.In outer tube, add a certain amount of harsh concrete, interior pipe is inserted in the outer tube, the harsh concrete in the outer tube is rammed out the outer tube bottom, thereby form a concrete enlarged footing, so that improve bearing capacity of single pile in the stake bottom.
Said outer tube diameter scope is φ 250-φ 550mm, and the length of outer tube is 4-20m.
Because the present invention has adopted the hammering bottom to be the dual steel sleeve of opening, thereby can adopt the method for clamp-oning the inserts in the interior pipe when removing immersed tube repeatedly, reduce the immersed tube resistance, have, guarantee that the immersed tube degree of depth meets the characteristics of designing pile length in the hard soil layer such as layer of sand at boulder bed.
The specific embodiment
Below in conjunction with specific embodiment operating principle of the present invention is described in further detail.
Embodiment one:
The present embodiment overview is: on certain engineering ground 12 layers, and B1, embedded depth of foundation 6.0m, the natural ground scheme is false.Building area 28000m
2, the design basis form is to lay out pile under the wall, the stripe shape basis, and a stake type is designed to compacted immersed tube and expands and ram the stake of steel concrete major part, and the parameter of design stake is: 3. stake footpath Φ 450, the long 6.5m of stake, stake end enter layer sand greater than 1.5m, stake bottom enlarged footing 0.5m
3, concrete strength is C35, and main muscle is set to 6 Φ 14, and the ultimate bearing capacity of single pile standard value is 2600KN.The stratum overview is: the basis down 1. a layer sand characteristic load bearing capacity be 140kpa, thickness 1.8-2.5m, mark is used to hit several 9-11 and is hit, 2. a layer sand characteristic load bearing capacity is 180kpa, 2. layer sand thickness is 3.5-4m, mark is used to hit several 11-17 and is hit.3. layer sand characteristic load bearing capacity is 250kpa, and thickness is greater than 10m, and mark is used to hit several 25-30 and is hit.Adopt the inventive method to construct, after the construction after testing the vertical ultimate bearing capacity of single pile standard value be 2600KN, a stake settling amount is 10-18mm.
The concrete steps of present embodiment are: first: with length is that the bottom of 7.35m is that the interior pipe of opening is put into the outer tube that length is the bottom end opening of 7.5m, and the diesel hammer base of 4 tons of weights is put on the garden shape steel plate on top on inner pipe.Second: start diesel hammer, pipe is gone up the garden shape steel plate on top in the hammering, and inner and outer pipe is sunk in the layer of sand simultaneously.The 3rd: when inner and outer pipe sank to layer of sand 4.5m, because layer of sand is compacted, it is very big that inner and outer pipe sinks in the layer of sand difficulty, and last ten inner and outer pipes of hammering are used to in-degree less than 5cm.Close at this moment diesel hammer, pipe in extracting out adopts and manually joins iron hammer, the sand in crooked chisel or compact spiral brill are removed from interior pipe bottom and clamp-oned in the pipe.The the 4th: interior pipe is put into outer tube, start the diesel hammer immersed tube, so the pipe of 6.5m is sunk in the layer of sand, and assurance hammering last ten is hit inner and outer pipes and is used to in-degree less than 3 centimetres.The 5th: pipe in extracting out, in outer tube, pour 0.2m into
3Harsh concrete will not removed the interior pipe of sand again and will be put into outer tube, and with the 0.2m in the outer tube
3The coagulation earth rammer out manage the bottom, thereby guarantee to form a concrete enlarged footing in the outer tube bottom.The 6th: pipe is put into outer tube with reinforcing cage in extracting out, and the perfusion slump is the concrete of 16-20cm in outer tube again, and concrete strength is C35.The the 7th: remove the sand in the pipe in clamp-oning, interior pipe is pressed to concrete surface in the outer tube, slowly evenly extract outer tube.The the 8th: after treating that outer tube is all extracted, pile body upper end 4m is vibrated with vibrating head.
Embodiment two:
The present embodiment overview is: on certain engineering ground 26 layers, and B1, frame structure, embedded depth of foundation 7.0m, the natural ground scheme is false.Former geology overview is the down the 2. layer boulder bed of basis, and natural characteristic load bearing capacity is 200kpa, and this layer thickness is 1.5-5.5m, and mark is used to hit several 11-27 and is hit.Distribution of strata is inhomogeneous, the 3. layer be silty clay, characteristic load bearing capacity is 180kpa, this layer thickness is 3.5-5.0m, the 4. layer be boulder bed, characteristic load bearing capacity is 280kpa, and mark is used to hit several 21-32 and is hit, and this layer thickness is 8.3-9.5m, this engineering design bearing course at pile end is for entering 4. layer boulder bed 1m, designing pile length 9.5m, stake footpath Φ 350, plain concrete soil squeezing pipe sinking is irritated king pile.Concrete strength is C25, and Bearing Capacity of Composite Foundation is 520kpa.
The concrete steps of present embodiment are: first: with length is that the bottom of 10.35m is that the interior pipe of opening is put into the outer tube that length is the bottom end opening of 10.50m, and the diesel hammer base of 4 tons of weights is put on the garden shape steel plate on top on inner pipe.Second: start diesel hammer, pipe is gone up the garden shape steel plate on top in the hammering, and inner and outer pipe is sunk in the foundation soil simultaneously.The 3rd: when immersed tube is difficult to penetrate the 2. during layer boulder bed, i.e. when hammering was used to in-degree less than 5cm last ten times, electronic long screw auger of configuration was removed soil and cobble in the pipe in clamp-oning in the effective iron hammer of manually joining in the suction, crooked chisel and interior pipe.The 4th: interior pipe is put into outer tube, continues hammer hidden pipe, so repeatedly twice, up to penetrate the 2. layer boulder bed, the 3. layer be that silty clay, inner and outer pipes enter the 4. layer boulder bed 1m.The 5th: pipe in extracting out, remove the inserts of clamp-oning in the interior pipe in order to last method, a garden shape steel plate end socket is installed in interior pipe bottom simultaneously, make the bottom sealing of interior pipe.The the 6th: in outer tube, insert 0.25m
2Harsh concrete is put into outer tube with interior pipe, and the harsh concrete of inserting the outer tube bottom is rammed out the outer tube bottom, thereby forms a little enlarged footing.The 7th: pipe in extracting out, the perfusion slump is 16-18cm in outer tube, intensity is the concrete of C25.The 8th: the circular steel plate end socket of pipe bottom in taking down, interior pipe is put into outer tube inner concrete surface, start the electric vibration hammer that is installed on the outer tube, slowly at the uniform velocity extract outer tube.The single pile construction finishes.
Claims (7)
1, the construction tube-sinking cast-in-situ pile guarantees the job practices that stake is long in boulder bed, layer of sand, it is characterized in that first: the interior pipe of bottom end opening is placed in the outer tube of bottom end opening, and the base of weight is put on the garden shape steel plate on top on inner pipe; Second: start weight, pipe is gone up the garden shape steel plate on top in the hammering, in making, outer tube sinks to boulder bed simultaneously, the garden gravel bed, the dust layer, in the stratum soil of layer of sand or severely-weathered mud stone, when the immersed tube difficulty, but when construction stake reaches less than designing requirement, pipe in extracting out, inserts in clamp-oning during with immersed tube in the pipe is removed, repeat to insert interior pipe in the outer tube again, restart weight, the garden shape steel plate on pipe top sinks in the geology soil inner and outer pipes simultaneously in the hammering, so repeated multiple times, make the immersed tube degree of depth reach designing pile length, but also will guarantee that the inner and outer pipes of last hammering ten times is used to in-degree less than 10cm; The 3rd: pipe in extracting out, penetration concrete in outer tube, the concrete spouting height is extracted behind the soil layer top mark height and is adhered to specification and be as the criterion for guaranteeing outer tube; The 4th: the inserts in clamp-oning during with immersed tube in the pipe is removed, and pushes down outer tube inner concrete surface with interior pipe, slowly at the uniform velocity extracts outer tube; The the 5th: after treating that outer tube is all extracted, pile body is vibrated with vibrating head.If an electric vibration hammer is installed on the outer tube, open the electric vibration hammer when pulling out outer tube, treat can no longer vibrate to pile body after outer tube is extracted.
2, according to the said job practices of claim 1, inserts in clamp-oning when it is characterized in that removing immersed tube in the pipe, its method is that interior pipe is extracted out and is placed on outside the outer tube, with manually joining iron hammer, crooked chisel or compact spiral are bored and are removed from interior pipe bottom, also can in interior pipe, dispose an electronic long screw auger, the inserts in the pipe in clamp-oning inwardly be managed the upper end transmit, thereby can reduce number of purge.
3, according to the said job practices of claim 1, it is characterized in that, if the inserts in the pipe is closely knit stone or sand in clamp-oning for the last time.Inserts in needn't removing again and clamp-on this moment in the pipe, the pipe bottom is sealed in can be considered.After then the hammer hidden pipe degree of depth reaches the designing pile length requirement, and the inner and outer pipes pile penetration that guarantees last hammering ten times is less than 10cm.Pipe in extracting out, in outer tube, pour a certain amount of harsh concrete into, interior pipe that to not remove inserts again is placed in the outer tube, harsh concrete in the outer tube is rammed out the outer tube bottom, thereby form a concrete enlarged footing in the outer tube bottom, again interior pipe is extracted out, in outer tube, poured into pile concrete.To remove interior pipe behind the inserts again and be placed on concrete surface in the outer tube, slowly evenly extract outer tube.
4, according to the said job practices of claim 1, it is characterized in that, during the hammer hidden pipe pore-forming, as if accompanying the boulder bed of thickness in the chance stratum greater than one meter, layer or layer of sand are pressed and smooth in garden gravel bed, angle, utilize the inserts in managing in clamp-oning when removing immersed tube repeatedly to realize penetrating above hard interbedded layer in the immersed tube process, adhere to specification to guarantee the immersed tube degree of depth.
5, according to the said job practices of claim 1, it is characterized in that, if what the inserts compactness in clamp-oning for the last time in the pipe did not guarantee immersed tube is used to in-degree less than 10cm, then to remove the inserts in the pipe in clamp-oning, a garden shape end socket steel plate is installed in interior pipe bottom then, the pipe bottom becomes closed in making, and the length of the interior pipe of assurance is than the short 5-25cm of outer tube, the circular steel board diameter of the low end closure of interior pipe is than the little 0.5-3cm of outer tube diameter, in outer tube, add a certain amount of harsh concrete, again interior pipe is inserted in the outer tube, the harsh concrete in the outer tube is rammed out the outer tube bottom, form a concrete enlarged footing in the outer tube bottom.
6. according to the said job practices of claim 1, it is characterized in that, when being designed to deposited reinforced concrete pile, then in extracting out, behind the pipe, earlier reinforcing cage is put into outer tube, again castinplace pile body concrete in outer tube.
7. according to the said job practices of claim 1, it is characterized in that said outer tube diameter scope is φ 250-φ 550mm, the length of outer tube is 4-20m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100183543A CN100513702C (en) | 2008-06-02 | 2008-06-02 | Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer and sand layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100183543A CN100513702C (en) | 2008-06-02 | 2008-06-02 | Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer and sand layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101280562A true CN101280562A (en) | 2008-10-08 |
| CN100513702C CN100513702C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2008100183543A Expired - Fee Related CN100513702C (en) | 2008-06-02 | 2008-06-02 | Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer and sand layer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444119A (en) * | 2011-09-19 | 2012-05-09 | 刘清洁 | Method for construction of pipe sinking cast-in-place pile in pebble bed, gravel layer and sand layer |
| CN102839653A (en) * | 2012-08-02 | 2012-12-26 | 天津二十冶建设有限公司 | Construction method for concrete pouring pile for soft soil foundation with built-in block rock layer |
| CN102995637A (en) * | 2012-12-19 | 2013-03-27 | 刘清洁 | Equipment and method for constructing immersed tube compaction pile on large-thickness backfilling or self-weight collapsible loess field |
| WO2013149471A1 (en) * | 2012-04-01 | 2013-10-10 | 上海振中机械制造有限公司 | Piling method based on hole-forming by sinking double pipes and pulling inner pipe, and application thereof |
| CN105275381A (en) * | 2014-05-28 | 2016-01-27 | 宏润建设集团股份有限公司 | Drilling construction method for water-rich cobble stratum by utilizing impact drill |
-
2008
- 2008-06-02 CN CNB2008100183543A patent/CN100513702C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444119A (en) * | 2011-09-19 | 2012-05-09 | 刘清洁 | Method for construction of pipe sinking cast-in-place pile in pebble bed, gravel layer and sand layer |
| WO2013149471A1 (en) * | 2012-04-01 | 2013-10-10 | 上海振中机械制造有限公司 | Piling method based on hole-forming by sinking double pipes and pulling inner pipe, and application thereof |
| CN102839653A (en) * | 2012-08-02 | 2012-12-26 | 天津二十冶建设有限公司 | Construction method for concrete pouring pile for soft soil foundation with built-in block rock layer |
| CN102995637A (en) * | 2012-12-19 | 2013-03-27 | 刘清洁 | Equipment and method for constructing immersed tube compaction pile on large-thickness backfilling or self-weight collapsible loess field |
| CN105275381A (en) * | 2014-05-28 | 2016-01-27 | 宏润建设集团股份有限公司 | Drilling construction method for water-rich cobble stratum by utilizing impact drill |
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| Publication number | Publication date |
|---|---|
| CN100513702C (en) | 2009-07-15 |
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