CN107366284B - Collapsible loess compaction pile construction device and construction method for reducing thickness of falling soil - Google Patents
Collapsible loess compaction pile construction device and construction method for reducing thickness of falling soil Download PDFInfo
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- CN107366284B CN107366284B CN201710569154.6A CN201710569154A CN107366284B CN 107366284 B CN107366284 B CN 107366284B CN 201710569154 A CN201710569154 A CN 201710569154A CN 107366284 B CN107366284 B CN 107366284B
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- 238000010276 construction Methods 0.000 title claims abstract description 67
- 239000002689 soil Substances 0.000 title claims abstract description 60
- 238000005056 compaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 49
- 230000001681 protective effect Effects 0.000 claims abstract description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 9
- 239000004571 lime Substances 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 53
- 238000005507 spraying Methods 0.000 claims description 31
- 238000003860 storage Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000011440 grout Substances 0.000 description 18
- 238000007569 slipcasting Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 6
- 238000010009 beating Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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Abstract
The invention provides a collapsible loess compaction pile construction device and a construction method for reducing the thickness of falling soil. The construction device comprises a hammering device and a hole-forming pile pipe, wherein a grouting hole is formed in the position, which is lower than the hammering protective sleeve, of the upper end of the hole-forming pile pipe, the length of the pipe body below the grouting hole is equal to or larger than the depth of the pile hole, and a plurality of grouting holes are formed in the position, which is higher than the expansion ring, of the lower end of the hole-forming pile pipe. The construction process of the compaction pile comprises the following steps: after pile hole construction is completed by hammering immersed tube, a grouting pump is connected with a grouting hole, and grouting operation is carried out on the wall of the pile hole uniformly through a grouting hole on the wall of a hole-forming pile tube in the tube drawing process, so that the surface of the inner wall of the pile hole is solidified, and filling work is carried out after solidification. The method is simple in construction, the amount of the fallen soil on the hole wall is smaller by solidifying the surface of the hole wall, the influence on the subsequent layering compaction of the plain soil/lime soil due to the thicker fallen soil in the hole forming process is avoided, the depth of the pile hole is also ensured, and the construction progress and the construction quality are improved.
Description
Technical Field
The invention belongs to the field of foundation treatment in collapsible loess areas, and relates to a collapsible loess compaction pile construction device and a construction method for reducing the thickness of falling soil.
Background
Collapsible loess is a kind of idiosyncratic soil, under certain pressure, sinks to be invaded wet by water after the stability, soil texture structure destroys rapidly to produce apparent additional and sink, so construct on collapsible loess place, when satisfying the ground bearing capacity, still need consider the size that the ground is invaded wet possibility and during the reuse to the strict degree of uneven settlement restriction select suitable ground treatment method, prevent that the ground collapsible from producing harm to the building.
At present, the mature and more applied treatment methods mainly comprise a cushion method, a dynamic compaction method, a pre-soaking method and the like, wherein the compaction pile method is more applied. The construction method is characterized by driving a cylindrical steel pile pipe into an original foundation by an impact or vibration method, forming a pile hole after the cylindrical steel pile pipe is pulled out, and then backfilling and compacting materials such as plain soil, lime soil, cement soil and the like, so that a pile body with an increased diameter is formed, and the pile body and the original foundation form a composite foundation together. The principle is that in the process of sinking the pipe, the sinking pipe extrudes the surrounding soil, so that the surrounding soil of the sinking pipe achieves the effect of compaction to eliminate the collapsibility of the surrounding of the sinking pipe, and then the pile hole is tamped. The existing compaction pile can continuously scrape surface soil of the inner wall of a pile hole in a pore-forming process and a pile pipe lifting process after the pore-forming process, so that a lot of fallen soil can be generated in the pile hole, the repeated soil digging operation for multiple times is increased, the thickness of the fallen soil is large, the pile length can not meet the design requirement, the compactness can not meet the requirement, the loess collapsibility can not be well eliminated, and the construction quality of foundation treatment is influenced.
Disclosure of Invention
The invention aims to provide a collapsible loess compaction pile construction device and a construction method for reducing the thickness of fallen soil, aiming at the construction defects of the existing compaction pile.
The invention provides a collapsible loess compaction pile construction device for reducing the thickness of falling soil, which comprises a hammering device and a pore-forming pile pipe, wherein the lower end of the pore-forming pile pipe is provided with a conical pile tip, and the collapsible loess compaction pile construction device is characterized in that: the pipe orifice at the upper end of the pore-forming pile pipe is sealed, the hammering protective sleeve is sleeved at the upper end of the pore-forming pile pipe, a grouting hole is formed in the position, lower than the hammering protective sleeve, of the upper end of the pipe body, the length of the pipe body below the grouting hole is equal to or larger than the depth of the pile hole, an expanding ring is arranged on the outer wall of the connecting part of the pore-forming pile pipe and the conical pile tip, the expanding ring is sleeved on the pore-forming pile pipe, and the upper end of the expanding ring is provided with a steel wire rope used for being connected with hoisting equipment during pipe drawing; the lower end of the pore-forming pile pipe is provided with a plurality of grout spraying holes higher than the expanding ring, the plurality of grout spraying holes are annularly distributed on the pipe wall of the pore-forming pile pipe, and a sealing baffle plate is arranged in the pore-forming pile pipe at a position lower than the grout spraying holes; construction equipment still includes the grouting pump, when the slip casting, tears the hammering protective sleeve open, passes through the slip casting pipe with the sealed intercommunication of the slip casting hole of pore-forming stake pipe upper end with the grouting pump, the thick liquid entrance point of grouting pump passes through the thick liquid pipe and stores up thick liquid equipment intercommunication.
The invention has the following excellent technical scheme: all be equipped with the protrusion separation blade in every spouting hole upper and lower position, the same height is arranged in to the protrusion separation blade that sets up in same high spouting hole top, and the same height is also arranged in to the protrusion separation blade that sets up in same high spouting hole below, and a plurality of protrusion separation blades all weld at pore-forming pile pipe outer pipe wall to shelter from completely on the spouting hole that will correspond, and set up and be less than the diameter of enlarged collar at the outer diameter that the most outside extreme point of a plurality of protrusion separation blades of same height connects the formation.
The invention has the following excellent technical scheme: the slurry spraying holes are water spraying holes with the diameter of 10-15 mm and are directly formed in the pipe wall of the pore-forming pile pipe, and nozzles are arranged or not arranged at the positions of the slurry spraying holes; the aperture of the grouting hole is 25-75 mm.
The invention has the advantages that: the protective sleeve is a sleeve with an inverted isosceles trapezoid cross section, the inner diameter of the sleeve is equal to or larger than the outer diameter of the hole-forming pile pipe, and the area of the top surface of the sleeve is equal to or smaller than the area of the cross section of the rammer of the hammering device.
The invention has the following excellent technical scheme: the slurry spraying holes are provided with two circles, each circle is provided with four slurry spraying holes which are distributed at equal intervals, the distance between the two circles of slurry spraying holes is 0.5-1.0 m, and the protruding blocking piece below the slurry spraying hole of the lowest circle is welded at the position close to the expanding ring; the sealing baffle is arranged at the lower edge of the guniting hole of the lowest circle.
The hole forming process of the invention is the same as that of the existing pile machine sinking pipe, and the hammering device can adopt a sinking pipe pile machine.
The invention provides a collapsible loess compaction pile construction method for reducing the thickness of falling soil, which is characterized by comprising the following steps of: the construction method using the collapsible loess compaction pile construction device for reducing the thickness of the falling soil as set forth in claim 1 or 2, comprises the following steps:
(1) Analyzing and determining the processing depth and the processing range of the collapsible loess according to geological survey and design requirements, and designing the hole forming depth of the compaction pile according to the to-be-processed depth of the collapsible loess;
(2) Leveling a field to be treated, carrying out measurement point placement work, and determining the specific position of each pile hole;
(3) The method comprises the following steps of starting to finish the hole forming construction of a pile hole in a hammering pipe sinking mode, firstly preparing construction equipment before construction, specifically comprising a hammering device and a hole forming pile pipe, and sleeving a protective sleeve on the upper end of the hole forming pile pipe;
(4) After construction equipment is prepared, the hole-forming pile pipe is placed at the design position of a certain pile hole, the conical pile tip of the pile pipe faces downwards, and the pile hole-forming pile pipe is hammered by a hammering device according to the existing compaction pile hole-forming construction method to complete the construction process of the pile hole;
(5) When the hole is formed to a depth of 0.5m below the design depth, stopping hammering, preparing a grouting pump, hermetically communicating the grouting end of the grouting pump with a grouting hole in the top surface of the hole-forming pile pipe through a grouting pipe, communicating the other end of the grouting pump with a slurry storage device, wherein the grouting liquid in the slurry storage device is any one of cement slurry, silicification slurry, alkali liquor, bentonite slurry, cement lime slurry, cement mortar and clear water;
(6) And (5) after the grouting pump in the step (5) is connected, connecting a steel wire rope on the expansion ring with a hoisting device, then starting pipe drawing work, lifting the hole-forming pile pipe upwards at the speed of 2-3m/min, starting the grouting pump simultaneously in the lifting process, and performing grouting operation on the wall of the pile hole through the grouting holes on the pipe wall of the hole-forming pile pipe uniformly to the wall of the pile hole so as to solidify the surface of the inner wall of the pile hole.
(7) When the pipe body of the pile pipe with the hole is separated from the pile hole, closing the grouting pump, stopping grouting, and checking the hole diameter and the hole depth of the formed hole, wherein the qualified standard of the hole depth is that the thickness of the fallen soil is less than or equal to 500mm;
(8) Tamping the filler in the hole by a tamping machine, wherein the mass of a tamping hammer is 300-400 kg, and the diameter of the tamping hammer is smaller than the aperture of 8-10 cm; the thickness of the filled deficient soil is not more than 400mm each time, the tamping times are 6-8 times, the lifting height of a tamping hammer is 3-5 m, and the filler is any one or more of lime soil, plain soil, cement soil and muck;
(9) And (5) repeating the steps (3) to (6) to finish the construction process of the compacted piles of all the designed pile positions.
And (5) in the pipe drawing process of the step (6), the pile pipe is formed by rotating the hole back and forth.
And the pressure of the grouting pump in the step (6) is 1-2MPa.
And (4) after the pipe drawing in the step (7) is finished, immediately starting the filler tamping work after the hole depth, the hole diameter and the fall-back thickness meet the requirements, and not waiting for slurry to solidify or go deep into a soil body.
The invention has the beneficial effects that:
(1) In the pipe drawing process after the hole forming is finished, the hole forming pile pipe is used for grouting or spraying water on the hole wall, and a protective layer is formed on the hole wall or a soil layer on the hole wall is humidified, so that the soil on the pipe wall can not fall into the hole in the pipe drawing process, and the falling soil in the pipe drawing process is greatly reduced;
(2) The invention directly adopts the hole-forming pile pipe to carry out grouting, which does not influence the hole-forming construction process, can evenly carry out grouting on the hole wall, and the grouting slurry can be selected at will, thereby enlarging the grouting range;
(3) The lower part of the pore-forming pile pipe is provided with the expanding ring, so that the contact between the outer wall of the pile pipe and the hole wall in the sinking process and the pipe drawing process of the pile pipe is reduced, the soil layer on the hole wall of the pile hole is prevented from being scraped by the pipe wall, and the occurrence of falling soil is further reduced;
(4) The hole-forming pile pipe adopts a special structure, the upper end pipe orifice of the hole-forming pile pipe is in a closed shape, the pipe orifice is provided with a grouting opening, and a grouting pump is arranged to inject grouting into the pipe body through the grouting opening;
(5) The sealing baffle is arranged at the lower edge of the grouting hole of the pore-forming pile pipe, so that the grouting liquid is prevented from accumulating in the conical tip of the pore-forming pile pipe, and the grouting liquid is prevented from being exposed out of the pipe from the joint of the pipe body and the conical tip;
(6) The upper and lower parts of each grouting hole are provided with the convex blocks, so that the grouting holes can be protected, the blockage of the grouting holes in the process of sinking and pulling the pile pipe can be avoided, and the downward flow of slurry along the outer wall of the pile pipe in the injection process can be blocked.
The invention has simple construction, is matched with a special hole-forming pile pipe, carries out grouting on the hole wall in the pipe drawing process after hole forming, and prevents the influence on the subsequent layering compaction of plain soil/lime soil due to thicker fallen soil in the hole forming process by solidifying the surface of the hole wall and reducing the quantity of the fallen soil of the hole wall, thereby ensuring the depth of the pile hole and improving the construction progress and the construction quality.
Drawings
FIG. 1 is a schematic view of a down tube structure according to the present invention;
FIG. 2 is a schematic view of the tube drawing structure of the present invention;
FIG. 3 is a schematic view of the construction of the hole-forming pile tube of the present invention;
FIG. 4 is a cross-sectional view AA in FIG. 3;
fig. 5 is a BB cross-sectional view of fig. 3.
In the figure: the method comprises the following steps of 1-a hole-forming pile pipe, 2-a conical pile tip, 3-a grouting hole, 4-a protective sleeve, 5-a grouting hole, 6-a sealing baffle, 7-a grouting pump, 8-a grouting pipe, 9-a grout pipe, 10-a grout storage device, 11-an expansion ring, 12-a protruding baffle, 13-a rammer, 14-a pile hole, 15-a steel wire rope and 16-a hoisting device.
Detailed Description
The invention is further described with reference to the following figures and implementations. The collapsible loess compaction pile construction device for reducing the thickness of the fallen soil comprises a hammering device and a hole-forming pile pipe 1 as shown in figure 1, wherein a conical pile tip 2 is arranged at the lower end of the hole-forming pile pipe 1, an upper pipe orifice of the hole-forming pile pipe 1 is sealed, a hammering protective sleeve 4 is sleeved at the upper end of the hole-forming pile pipe 1, the protective sleeve 4 is a sleeve with an inverted isosceles trapezoid cross section, the inner diameter of the sleeve is slightly larger than the outer diameter of the hole-forming pile pipe 1, the sleeve can be sleeved at the upper part of the hole-forming pile pipe 1, the area of the top surface of the sleeve is slightly smaller than the area of the cross section of a rammer 13 of the hammering device, the pile head can be protected, and the hammering area can be increased. The position that is less than hammering protective sleeve 4 on the pore-forming pile pipe 1 is equipped with slip casting hole 3, the aperture of slip casting hole 3 is 25~75mm, can directly be connected with slip casting pipe 8, also can be through connecting with slip casting pipe 8 sealed intercommunication, ensures to accomplish the slip casting work. The length of the pore-forming pile pipe 1 below the grouting hole 3 is equal to or greater than the depth of the pile hole 14, and when the pile pipe is used for punching, the height of the grouting hole 3 is always higher than the ground, so that pore-forming is prevented from being influenced.
As shown in fig. 3, an enlarged ring 11 is arranged on the outer wall of the connection part of the pore-forming pile tube 1 and the conical pile tip 2, the enlarged ring 11 is sleeved on the pore-forming pile tube 1, and the upper end of the enlarged ring is provided with a steel wire rope 15 for connecting with a hoisting device during tube drawing; the enlarged ring 11 is mainly for the convenience pore-forming to ensure that the aperture of stake hole 14 is greater than the pipe diameter of pore-forming stake pipe 1, avoid stake pipe 1 can't extract from stake hole 14, when the tube drawing, can be connected enlarged ring 11 with hoisting equipment 16 through wire rope 15, avoid at the tube drawing in-process enlarged ring 7 and pore-forming stake pipe 1 drop. A plurality of whitewashing holes 5 have been seted up in the position that pore-forming pile pipe 1 lower extreme is higher than expanding ring 11, a plurality of whitewashing holes 5 are the annular and distribute on pore-forming pile pipe 1's pipe wall, are equipped with two circles, and every circle is equipped with four whitewashing holes 5, and four whitewashing holes 5 equidistance distribute, and the interval of two circles whitewashing holes 5 is 0.5~1.0m, and 5 apertures in every whitewashing hole are 10~15mm, also can set up the nozzle in whitewashing hole 5's position. In order to avoid blockage of the guniting holes 5 in the pipe sinking and pipe drawing processes and avoid downward flow of slurry along the pipe wall, the upper position and the lower position of each guniting hole 5 are respectively provided with a protruding baffle 12, the protruding baffles 12 arranged above the guniting holes 5 at the same height are arranged at the same height, the protruding baffles 12 arranged below the guniting holes 5 at the same height are also arranged at the same height, a plurality of protruding baffles 12 are all welded on the outer pipe wall of the hole-forming pile pipe 1 and completely shield the upper part and the lower part of the corresponding guniting holes 5, and the protruding baffles 11 below the guniting holes 5 at the lowest circle are welded at the position close to the enlarged rings 11; and the outer diameter of a circular ring formed by connecting the outermost end points of the plurality of protruding blocking pieces 12 arranged at the same height is smaller than the diameter of the expanding ring 11, so that the protruding blocking pieces 12 are ensured not to be contacted with the hole wall of the pile hole 4 in the pipe drawing process, and soil on the hole wall is scraped off. In order to avoid accumulation of grout in the conical pile tip 2 and exposure of grout from a connecting gap between the hole-forming pile pipe and the conical pile tip, a sealing baffle 6 is arranged in the hole-forming pile pipe 1 at a position lower than the grout spraying hole 5 and higher than the enlarged ring 11, and the sealing baffle 6 is arranged at the lower edge of the grout spraying hole 5 at the lowest ring.
As shown in fig. 2, the construction device of the present invention further comprises a grouting pump 7, wherein during grouting, the grouting pump 7 is hermetically communicated with the grouting hole 3 at the upper end of the bored pile pipe 1 through a grouting pipe 8, and a grout inlet end of the grouting pump 7 is communicated with a grout storage device 10 through a grout pipe 9. The slurry storage device 10 can be a slurry storage tank or other devices, and the slurry inside the slurry storage device is any one of cement slurry, silicification slurry, alkali liquor, bentonite slurry, cement lime slurry, cement mortar and clear water.
Example (b): take the treatment of a certain self-weight collapsible loess foundation in a new Lanzhou area as an example. Determining that the area can be treated by adopting lime-soil compaction piles according to geological survey and design requirements, wherein the pile length is 8m, the pile diameter is 0.5m, the pile spacing is 1m, and the specific implementation process is as follows:
(1) The construction method comprises the following steps of (1) leveling a to-be-treated field, positioning the point position of a pile to be compacted, marking, and selecting a slurry storage position;
(2) The top end of the hole-forming pile tube 1 is provided with a protective sleeve 4, the protective sleeve can be directly sleeved at the top end of the hole-forming pile tube 1 or welded at the top end of the hole-forming pile tube 1, so that the protective sleeve 4 can not fall off in the hammering process and the hammering hole-forming construction can not be influenced, an expanding ring 11 is arranged at the pile tip position, and the expanding ring 11 is sleeved on the hole-forming pile tube 1; two circles of flower holes (namely, grout spraying holes 5) are arranged on a pipe body of the hole-forming pile pipe 1 in a beating mode, each circle of grout spraying holes 5 consists of four holes which are evenly distributed and have the diameter of 10-15 mm, protruding blocking pieces 12 are arranged above and below the grout spraying holes 5 for protection, the grout spraying holes 5 and the protruding blocking pieces 12 can be manufactured in a factory or on site, a sealing baffle 6 is arranged at the lower edge of the grout spraying hole 5 in the lowest circle, and the sealing baffle 6 is welded on the inner wall of the hole-forming pile pipe 1 to prevent grout from flowing into a pile tip;
(3) The hole-forming pile pipe 1 is installed in place, and hole-forming construction of a pile hole is completed by hammering a sinking pipe;
(4) When the hole is formed to a depth of 0.5m below the design depth, stopping hammering, preparing a grouting pump 7, hermetically communicating the grouting end of the grouting pump 7 with the grouting hole 3 on the top surface of the hole-forming pile pipe 1 through a grouting pipe 8, communicating the other end of the grouting pump 7 with a slurry storage device 10, and selecting any one of cement slurry, silicification slurry, alkali liquor, bentonite slurry, cement lime slurry, cement mortar and clear water as the grouting slurry in the slurry storage device 10;
(6) After the grouting pump 7 in the step (5) is connected, connecting a steel wire rope 15 on the expansion ring 11 with a hoisting device 16 to avoid the separation of the expansion ring 11 and the pore-forming pile pipe 1 in the pipe drawing process, starting pipe drawing work after the connection, lifting the pore-forming pile pipe 1 upwards at the speed of 2-3m/min, simultaneously starting the grouting pump 7 in the lifting process, and uniformly spraying the grouting operation to the wall of the pile hole 14 through the grouting holes 5 on the pipe wall of the pore-forming pile pipe 1 to solidify the inner wall surface of the pile hole 14; the pressure of the grouting pump is 1-2MPa, and the hole-forming pile pipe 1 is rotated back and forth in the pipe drawing process, so that the grouting is more uniform;
(7) When the pipe body of the pile pipe 1 is separated from the pile hole 14, the grouting pump 7 is closed, the grouting operation is stopped, the hole diameter and the hole depth of the formed hole are checked, and the qualified standard of the hole depth is that the thickness of the fallen soil is less than or equal to 500mm; if the design requirements are not met, inserting and beating can be carried out again until the qualified standards are met, and secondary guniting is not needed when the holes and the pipes are punched and pulled for the second time;
(8) Immediately starting the tamping work of the filler after the aperture and the hole depth of the formed hole meet the design requirement that the thickness of the fallen soil is less than or equal to 500mm and the qualified standard of the hole depth does not exceed the solidification of the slurry or the penetration into the soil body, tamping the filler in the hole by using a tamping machine, wherein the mass of a tamping hammer is 300-400 kg, and the diameter of the tamping hammer is less than the aperture of 8-10 cm; the thickness of the filled deficient soil is not more than 400mm each time, the tamping times are 6-8 times, the lifting height of a tamping hammer is 3-5 m, and the filling material is any one or more of lime soil, plain soil, cement soil and residue soil;
(9) And (5) repeating the steps (3) to (6) to complete the construction process of the compacted piles of all designed pile positions.
When the method is used for construction, the falling soil is less, the construction in the hole forming process can be completed by one-time hammering under the general condition, the pile hole after construction can also quickly reach the design requirement, the workload is reduced, the construction period is shortened, and the construction progress and the construction quality are improved.
Claims (7)
1. The collapsible loess compaction pile construction method for reducing the thickness of falling soil is characterized in that: the construction method comprises the following steps of constructing by using a collapsible loess compaction pile construction device for reducing the thickness of falling soil, wherein the construction device comprises a hammering device and a pore-forming pile pipe (1), the lower end of the pore-forming pile pipe (1) is provided with a conical pile tip (2), the upper end pipe orifice of the pore-forming pile pipe (1) is in a sealed state, the upper end of the pore-forming pile pipe is sleeved with a protective sleeve (4), the upper end of the pore-forming pile pipe (1) is provided with a grouting hole (3) at a position lower than the protective sleeve (4), the length of the pore-forming pile pipe (1) below the grouting hole (3) is equal to or larger than the depth of a pile hole (14), the outer wall of the connecting part of the pore-forming pile pipe (1) and the conical pile tip (2) is provided with an enlarged ring (11), the enlarged ring (11) is sleeved on the pore-forming pile pipe (1), and the upper end of the enlarged ring is provided with a steel wire rope (15) for connecting with a hoisting device during pipe drawing; a plurality of guniting holes (5) are formed in the position, higher than the expanding ring (11), of the lower end of the hole-forming pile pipe (1), the plurality of guniting holes (5) are annularly distributed on the pipe wall of the hole-forming pile pipe (1), and a sealing baffle plate (6) is arranged in the position, lower than the guniting holes (5), of the hole-forming pile pipe (1); the slurry spraying holes (5) are water spraying holes with the diameter of 10 to 15mm and are directly formed in the pipe wall of the hole forming pile pipe (1), protruding blocking pieces (12) are arranged at the upper position and the lower position of each slurry spraying hole (5), the protruding blocking pieces (12) arranged above the slurry spraying holes (5) at the same height are arranged at the same height, the protruding blocking pieces (12) arranged below the slurry spraying holes (5) at the same height are also arranged at the same height, the protruding blocking pieces (12) are welded on the outer pipe wall of the hole forming pile pipe (1) and completely block the corresponding slurry spraying holes (5) from top to bottom, and the outer diameter of a circular ring formed by connecting the outermost side end points of the protruding blocking pieces (12) at the same height is smaller than the diameter of the expanding ring (11); the construction device also comprises a grouting pump (7), wherein during grouting, the grouting pump (7) is hermetically communicated with a grouting hole (3) at the upper end of the pore-forming pile pipe (1) through a grouting pipe (8), and the slurry inlet end of the grouting pump (7) is communicated with a slurry storage device (10) through a slurry pipe (9);
the construction method comprises the following specific steps:
(1) Analyzing and determining the processing depth and the processing range of the collapsible loess according to geological survey and design requirements, and designing the hole forming depth of the compaction pile according to the to-be-processed depth of the collapsible loess;
(2) Leveling a field to be treated, carrying out measurement point placement work, and determining the specific position of each pile hole;
(3) The method comprises the following steps of starting to finish the hole forming construction of a pile hole in a hammering pipe sinking mode, firstly preparing construction equipment before construction, specifically comprising a hammering device and a hole forming pile pipe, and sleeving a protective sleeve at the upper end of the hole forming pile pipe;
(4) After construction equipment is prepared, the hole-forming pile pipe is placed at the design position of a certain pile hole, the conical pile tip of the pile pipe faces downwards, and the pile hole-forming pile pipe is hammered by a hammering device according to the existing compaction pile hole-forming construction method to complete the construction process of the pile hole;
(5) When the hole is formed to a depth of 0.5m below the design depth, stopping hammering, preparing a grouting pump, hermetically communicating the grouting end of the grouting pump with a grouting hole in the top surface of the hole-forming pile pipe through a grouting pipe, communicating the other end of the grouting pump with a slurry storage device, wherein the grouting liquid in the slurry storage device is any one of cement slurry, silicification slurry, alkali liquor, bentonite slurry, cement lime slurry, cement mortar and clear water;
(6) After the grouting pump in the step (5) is connected, connecting a steel wire rope on the expansion ring with a hoisting device, then starting pipe drawing work, lifting the hole-forming pile pipe upwards at the speed of 2-3m/min, starting the grouting pump simultaneously in the lifting process, uniformly spraying the grouting hole on the pipe wall of the hole-forming pile pipe to the wall of the pile hole, and curing the surface of the inner wall of the pile hole;
(7) When the pipe body of the pile pipe with the hole is separated from the pile hole, closing the grouting pump, stopping grouting, and checking the hole diameter and the hole depth of the formed hole, wherein the qualified standard of the hole depth is that the thickness of the fallen soil is less than or equal to 500mm;
(8) Tamping the filler in the hole by using a tamping machine, wherein the mass of a tamping hammer is 300 to 400kg, and the diameter of the tamping hammer is smaller than the aperture of 8 to 10cm; the thickness of the filled soil is not more than 400mm every time, the tamping times are 6 to 8, the lifting height of a tamping hammer is 3 to 5m, and the filler is any one or more of grey soil, plain soil, cement soil and muck;
(9) And (5) repeating the steps (3) to (6) to finish the construction process of the compacted piles of all the designed pile positions.
2. The collapsible loess compaction pile construction method according to claim 1, wherein the collapsible loess compaction pile comprises: a nozzle is arranged or not arranged at the position of the guniting hole (5); the aperture of the grouting hole (3) is 25 to 75mm.
3. The collapsible loess compaction pile construction method according to claim 1, wherein the collapsible loess compaction pile comprises: the protective sleeve (4) is a sleeve with an inverted isosceles trapezoid cross section, the inner diameter of the sleeve is equal to or larger than the outer diameter of the hole-forming pile pipe (1), and the area of the top surface of the sleeve is equal to or smaller than the area of the cross section of a rammer (13) of a hammering device.
4. The collapsible loess compaction pile construction method according to claim 1, wherein the collapsible loess compaction pile comprises: the slurry spraying holes (5) are arranged in two circles, each circle is provided with four slurry spraying holes (5), the four slurry spraying holes (5) are distributed at equal intervals, the distance between the two circles of slurry spraying holes (5) ranges from 0.5m to 1.0m, and a protruding retaining sheet (12) below the slurry spraying hole (5) in the lowest circle is welded at a position close to the enlarged ring (11); the sealing baffle (6) is arranged at the lower edge of the guniting hole (5) of the lowest circle.
5. The collapsible loess-compacting pile constructing method according to claim 1, wherein the hole-forming pile tube is rotated back and forth during the tube-drawing process of the step (6).
6. The collapsible loess compaction pile construction method for reducing the thickness of falling soil as claimed in claim 1, wherein: and (5) the pressure of the grouting pump in the step (6) is 1-2MPa.
7. The collapsible loess compaction pile construction method for reducing the thickness of falling soil as claimed in claim 1, wherein: and (5) after the pipe drawing in the step (7) is finished, immediately starting the filling material tamping work after the hole depth, the hole diameter and the fall-back thickness meet the requirements, and enabling the slurry not to be solidified or to penetrate into the soil body during filling.
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| CN112663606A (en) * | 2020-12-23 | 2021-04-16 | 江苏东合南岩土科技股份有限公司 | Construction method of concrete expanded head prestress anti-pulling anchor rod |
| CN113668497A (en) * | 2021-09-01 | 2021-11-19 | 陕西龙海新创基础工程有限公司 | Construction device and method for ultra-long immersed tube compaction pile |
| CN114991117A (en) * | 2022-07-06 | 2022-09-02 | 兰州交通大学 | Humidification structure for humidifying loess foundation by using water vapor and construction method |
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