CN114657987B - Construction method for inserting cement soil pile into steel pipe without shock sensation - Google Patents
Construction method for inserting cement soil pile into steel pipe without shock sensation Download PDFInfo
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- CN114657987B CN114657987B CN202210353471.5A CN202210353471A CN114657987B CN 114657987 B CN114657987 B CN 114657987B CN 202210353471 A CN202210353471 A CN 202210353471A CN 114657987 B CN114657987 B CN 114657987B
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- cement soil
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 161
- 239000010959 steel Substances 0.000 title claims abstract description 161
- 239000002689 soil Substances 0.000 title claims abstract description 119
- 239000004568 cement Substances 0.000 title claims abstract description 105
- 238000010276 construction Methods 0.000 title claims abstract description 60
- 230000035939 shock Effects 0.000 title claims description 17
- 230000035807 sensation Effects 0.000 title claims description 13
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 44
- 239000002002 slurry Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 10
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000004576 sand Substances 0.000 description 8
- 238000003825 pressing Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
Abstract
The invention discloses a construction method of a cement-soil pile non-shock-sensation inserting steel pipe, which comprises the steps of manufacturing a cement-soil pile at a set position; the top end of the steel pipe is clamped by a vibration drawing machine, and the steel pipe is pre-inserted downwards to a first set depth of the cement soil pile; the vibration drawing machine is separated from the steel pipe, the top end of the steel pipe is clamped by the vibration hammer, and the vibration hammer applies circumferential reciprocating acting force to the steel pipe so that the vibration hammer and the steel pipe move downwards to a second set depth of the cement soil pile; the vibrating machine clamps the top of the vibrating hammer and applies downward pressure to the vibrating hammer until the lower end of the steel pipe reaches a third set depth of the cement soil pile, so that the cement soil steel pipe composite pile is completed.
Description
Technical Field
The invention relates to the technical field of cement-soil pile steel pipe composite piles, in particular to a construction method for inserting a cement-soil pile into a steel pipe without shock sensation.
Background
At present, cement soil pile inserted section steel is widely used for foundation pit water-stop support at home and abroad, a series of construction methods are created, such as SMW construction method, CSM construction method, TRD construction method and the like, and a construction method for pressing and filling cement soil pile inserted section steel is also produced, so that the construction method has the advantages of saving land occupation, recycling section steel, saving construction cost, utilizing solid wastes and the like, and is popularized and applied by more and more people.
However, in the construction process, the upper soil layer section steel can be easily inserted only by utilizing the dead weight and the weight of the vibrating hammer, but the lower compact sand layer is slightly difficult, the vibrating hammer has to be started to perform vibration insertion, only a few seconds or even tens of seconds are required when the vibration hammer is smooth, the time is longer when the vibration hammer is difficult, the surrounding owners have requirements on the environment in some construction sites such as villa areas, and some noises can be tolerated, but the vibration hammer is strongly started for a long time, and the disturbance to the people is serious.
However, some hydrostatic presses require a distance of 5m from the center of the pile to the edge of the equipment, even 2m for the side piles, and have large space requirements and are difficult to meet in some construction sites.
Disclosure of Invention
The invention mainly aims to provide a construction method for inserting a cement-soil pile into a steel pipe without shock sensation, and aims to solve the technical problem that under the existing extreme construction conditions, the cement-soil pile is inserted into a section steel to cause strong shock sensation so as to disturb people.
In order to achieve the above object, the present invention provides a construction method for a concrete pile non-shock-sensation inserted steel pipe, the construction method for the concrete pile non-shock-sensation inserted steel pipe comprising:
s20, manufacturing a cement soil pile at a set position;
s40, clamping the top end of the steel pipe through a vibration drawing machine, and pre-inserting the steel pipe downwards to a first set depth of the cement soil pile;
step S60, the vibration and extraction machine is separated from the steel pipe, the top end of the steel pipe is clamped by an oscillating weight, and the oscillating weight applies circumferential reciprocating acting force to the steel pipe so that the oscillating weight and the steel pipe move downwards to a second set depth of the cement soil pile;
step S80, the vibration and extraction machine clamps the top end of the oscillating weight, downward pressure is applied to the oscillating weight until the lower end of the steel pipe reaches a third set depth of the cement soil pile, and the cement soil steel pipe composite pile is completed;
in step S60, the oscillating weight includes:
a case;
the eccentric bodies are arranged in the box body along the horizontal direction, and each pair of the eccentric bodies is symmetrically arranged along a first axis in the same vertical direction; the method comprises the steps of,
the clamping claw is fixedly arranged at the lower end of the box body and used for clamping the steel pipe so that the steel pipe is fixedly connected with the oscillating weight;
wherein the jaws are arranged coaxially with the first axis in a vertical direction;
each eccentric body rotates along a second axis in the vertical direction at the same direction and the same rotating speed, and generates a circumferential acting force along the oscillating weight, so that the steel pipe generates a circumferential acting force on cement soil in the lateral direction;
the step S60 specifically includes:
step S61, the vibration and extraction machine is separated from the steel pipe, and the top end of the steel pipe is clamped through the vibration hammer;
step S62, the oscillating weight drives the steel pipe to move upwards to separate from the cement soil pile;
step S63, continuously starting the oscillating weight to enable the soil plug in the steel pipe to vibrate and pour out;
step S64, the oscillating weight drives the steel pipe to be inserted downwards to a second set depth of the cement soil pile;
before step S40, the construction method for inserting the cement-soil pile into the steel pipe without shock sensation further includes:
and S30, machining and welding a centering bracket on the steel pipe, so that the steel pipe cannot contact with the side edge of the cement soil pile in the pile sinking process.
Optionally, in step S60, a clamping portion is fixedly disposed at the top end of the oscillating weight, the vibration extractor clamps the clamping portion, and applies downward pressure to the clamping portion until the lower end of the steel pipe reaches the third set depth, so as to complete the cement-soil steel pipe composite pile.
Optionally, in step S40, the first set depth is set to a, where a is equal to or greater than 5m.
Optionally, in step S20, the soil cement pile is a stirring pile, and step S20 specifically includes:
s21, installing and debugging a stirring pile machine;
s22, downwards drilling a stirring rod to the third set depth of the cement soil pile;
s23, opening a cement slurry pouring device at the lower end of the stirring rod;
s24, the lower end of the stirring rod moves upwards to the second set depth, and reciprocates between the third set depth and the second set depth to implement a construction mode of six stirring and six spraying;
s25, the lower end of the stirring rod moves upwards from the second set depth to the top end of the cement soil pile, and reciprocates between the second set depth and the top end of the cement soil pile to implement a four-stirring four-spraying construction mode;
and S26, closing the cement paste pouring device, and retracting the stirring rod.
Optionally, in step S21:
and when the stirring pile machine is installed and debugged, a slurry groove with a certain width and depth is dug at two sides of the set position through an excavator, the width of the slurry groove is 0.8-1 m, and the depth of the slurry groove is 0.8-1 m.
Optionally, the cement soil pile is a stirring pile or a jet grouting pile or a stirring spraying pile or a pressure grouting cement soil pile; and/or the number of the groups of groups,
the cement soil steel pipe composite pile is a foundation pit water stop support pile or a compression-resistant pile or a pulling-resistant pile or other types of piles.
In the technical scheme of the invention, a cement soil pile is manufactured at a set position, then the top end of a steel pipe is clamped by a vibration extractor, the steel pipe is pre-inserted downwards to a first set depth of the cement soil pile, the steel pipe is stabilized in the cement soil pile, the vibration extractor is separated from the steel pipe, the top end of the steel pipe is clamped by an oscillating hammer, the oscillating hammer applies circumferential reciprocating acting force to the steel pipe, so that the loosening resistance of cement soil around the steel pipe is reduced, the oscillating hammer and the steel pipe downwards move to a second set depth of the cement soil pile, at the moment, the resistance reaching a sand soil layer is increased, the top end of the oscillating hammer cannot be overcome by the self weight of the oscillating hammer and the steel pipe, the top end of the oscillating hammer is clamped by the vibration extractor, the technical scheme of the invention is that the oscillating weight is adopted, the oscillating weight does not generate downward active acting force and only generates circumferential reciprocating acting force in the horizontal direction, the oscillating weight is driven to shake back and forth to reduce the resistance of cement soil and sink by self weight, the surrounding environment is almost free from shock feeling in the process, and when the self weight is insufficient, the oscillating weight is applied to the oscillating weight by the vibrating machine, so that the steel pipe is continuously sunk to the preset depth of the cement soil pile, and the cement soil steel pipe composite pile is completed under the condition of no shock feeling to the surrounding environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a first embodiment of a construction method for a cement-soil pile shock-free insertion steel pipe provided by the invention;
FIG. 2 is a schematic elevational view of an oscillating weight according to the present invention;
FIG. 3 is a schematic cross-sectional view of the structure at A-A in FIG. 2;
FIG. 4 is a schematic flow chart of a second embodiment of a construction method for inserting a concrete pile into a steel pipe without shock sensation, which is provided by the invention;
FIG. 5 is a schematic flow chart of a third embodiment of a construction method for inserting a concrete pile into a steel pipe without shock sensation, which is provided by the invention;
fig. 6 is a schematic flow chart of a fourth embodiment of a construction method for inserting a cement-soil pile into a steel pipe without shock sensation.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
At present, cement soil pile inserted section steel is widely used for foundation pit water-stop support at home and abroad, a series of construction methods are created, such as SMW construction method, CSM construction method, TRD construction method and the like, and a construction method for pressing and filling cement soil pile inserted section steel is also produced, so that the construction method has the advantages of saving land occupation, recycling section steel, saving construction cost, utilizing solid wastes and the like, and is popularized and applied by more and more people.
However, in the construction process, the upper soil layer section steel can be easily inserted only by utilizing the dead weight and the weight of the vibrating hammer, but the lower compact sand layer is slightly difficult, the vibrating hammer has to be started to perform vibration insertion, only a few seconds or even tens of seconds are required when the vibration hammer is smooth, the time is longer when the vibration hammer is difficult, the surrounding owners have requirements on the environment in some construction sites such as villa areas, and some noises can be tolerated, but the vibration hammer is strongly started for a long time, and the disturbance to the people is serious.
However, some hydrostatic presses require a distance of 5m from the center of the pile to the edge of the equipment, even 2m for the side piles, and have large space requirements, and some construction sites do not have construction conditions.
Therefore, the invention provides a construction method of a cement-soil pile shock-free insert steel pipe, and referring to fig. 1, fig. 1 is a flow diagram of a first embodiment of the construction method of a cement-soil pile shock-free insert steel pipe.
In this embodiment, the construction method for inserting the cement-soil pile into the steel pipe without shock sensation includes the following steps:
and S20, manufacturing the cement soil pile at the set position.
It should be noted that the depth of the set pile bottom of the cemented soil pile may be any depth, and is not limited herein, and in this embodiment, the depth of the set pile bottom of the cemented soil pile is 12m.
And S40, clamping the top end of the steel pipe through a vibration extractor, and pre-inserting the steel pipe downwards to a first set depth of the cement soil pile.
In specific implementation, the clamp of the vibrating machine can clamp the steel pipe through transformation, when the vibrating machine clamps the top end of the steel pipe to insert the steel pipe downwards in advance, the center of the cement soil pile is required to be inserted, the integral strength of the cement soil pile is ensured, and as the vibrating hammer at the upper end of the clamp of the vibrating machine cannot be started, the vibrating machine is only inserted under the dead weight of the steel pipe and the downward pressure exerted by the vibrating machine, and therefore vibration force is not generated in the step.
It should be noted that, if the first preset depth is a, a is greater than or equal to 5m, that is, the lower end of the steel pipe is inserted into the cement soil pile for at least 5m, so as to ensure the stability of the steel pipe, so that even if the vibration-pulling machine is separated from the steel pipe, the steel pipe can be stabilized in the cement soil pile, and the cement soil pile cannot be broken by dumping to the side.
And step S60, the vibration and extraction machine is separated from the steel pipe, the top end of the steel pipe is clamped by an oscillating weight, and the oscillating weight applies circumferential reciprocating acting force to the steel pipe, so that the oscillating weight and the steel pipe move downwards to a second set depth of the cement soil pile.
In specific implementation, the vibration pulling machine is separated from the steel pipe, the vibration hammer is withdrawn from the construction position to give out a working surface, the upper end of the vibration hammer is lifted to move above the steel pipe by a lifting hook of a crane and clamps the top end of the steel pipe, the vibration hammer is started, the vibration hammer applies circumferential reciprocating acting force to the steel pipe to drive the steel pipe to apply circumferential reciprocating acting force to lateral cement soil of the steel pipe, so that cement soil piles near the steel pipe are liquefied, the effect of reducing the resistance of the cement soil piles is achieved, when the dead weights of the vibration hammer and the steel pipe are larger than the resistance, the vibration hammer and the steel pipe move downwards to a second set depth of the cement soil piles, and as the horizontal circumferential reciprocating acting force acts on the lateral cement soil piles, no vibration force in the up-down direction is generated, and therefore, the vibration feeling is almost absent for surrounding environments.
It should be noted that, the second set depth is a position of the sand layer depth, and it will be understood by those skilled in the art that the resistance of the sand layer is larger than that above the sand layer, and it is very difficult to continue sinking only by the self weights of the oscillating weight and the steel pipe, so that after the oscillating weight and the steel pipe move down to the second set depth of the cement pile, the oscillating weight remains in an open state, and the second set depth is determined according to the position of the sand layer obtained by on-site investigation before construction.
Further, a clamping portion is fixedly arranged at the top end of the oscillating weight, the vibrating and pulling machine clamps the clamping portion, downward pressure is applied to the clamping portion until the lower end of the steel pipe reaches the third set depth, and the cement soil steel pipe composite pile is completed.
And S80, clamping the top end of the oscillating hammer by the vibrating and pulling machine, and applying downward pressure to the oscillating hammer until the lower end of the steel pipe reaches a third set depth of the cement soil pile, thereby completing the cement soil steel pipe composite pile.
In specific implementation, the crane controls the lifting hook to incline to one side, the top end of the oscillating weight is exposed, the vibrating machine is opened back, the top end of the oscillating weight is clamped by the clamp of the vibrating machine, downward pressure is applied to the oscillating weight, the resistance of the sand layer is overcome under the combined action of the oscillating weight and the vibrating machine, the steel pipe slowly sinks until the lower end of the steel pipe reaches the third set depth of the cement soil pile, namely the set pile bottom depth of the cement soil pile, and the cement soil steel pipe composite pile is completed.
Further, referring to fig. 2 and 3, in the step S60 of the present embodiment, the oscillating weight includes a case 1001, a plurality of pairs of eccentric bodies 1002, and a claw 1003, the plurality of pairs of eccentric bodies 1002 are disposed in the case 1001 in a horizontal direction, each pair of eccentric bodies 1002 of the plurality of pairs of eccentric bodies 1002 is symmetrically disposed along a first axis 1004 in a same vertical direction, the claw 1003 is fixedly disposed at a lower end of the case 1001, and the claw 1003 is configured to clamp the steel pipe to fixedly connect the steel pipe with the oscillating weight, wherein the claw 1003 is disposed coaxially with the first axis 1004 in a vertical direction, so that the steel pipe is disposed coaxially with the first axis 1004, and the steel pipe is uniformly stressed.
Further, after the oscillating weight is turned on, each eccentric body 1002 of the oscillating weight rotates along the respective second axis 1005 in the vertical direction in the same direction and at the same rotation speed, and since each pair of eccentric bodies 1002 are symmetrically arranged along the first axis 1004, eccentric forces generated during rotation cancel each other, so that the oscillating weight realizes horizontal circumferential vibration, and a force along the circumferential direction of the oscillating weight is generated, so that the steel pipe generates a circumferential force on cement soil laterally of the steel pipe.
Referring to fig. 4, fig. 4 is a schematic flow chart of a second embodiment of a construction method for a cement pile without shock induction inserted into a steel pipe according to the present invention.
Based on the first embodiment, the step S40 specifically includes:
and S41, disconnecting the vibration and extraction machine from the steel pipe, and clamping the top end of the steel pipe through the oscillating weight.
In the concrete implementation, the vibration and extraction machine is separated from the steel pipe, the vibration and extraction machine exits from the construction position to give out a working surface for the vibration hammer, and the upper end of the vibration hammer is lifted by a lifting hook of a crane to move above the steel pipe and clamp the top end of the steel pipe.
And S42, driving the steel pipe to move upwards by the oscillating weight to separate from the cement soil pile.
Because of the hollow characteristic of the steel pipe, when the steel pipe is pre-inserted into the cement soil pile, a soil plug is formed at the hollow position of the steel pipe, which causes an increase in resistance when the steel pipe sinks, and affects construction in environments where some soil resistance is large.
In the concrete implementation, the oscillating weight is driven by the crane to slowly move upwards until the lower end of the steel pipe is separated from the cement soil pile and deviates to one side.
And S43, continuously starting the oscillating weight to enable the soil plug in the steel pipe to vibrate and pour.
In specific implementation, the oscillating weight is continuously started to vibrate, so that the soil plug in the steel pipe can be loosened and fall off until the soil plug completely falls out of the steel pipe.
And S44, driving the steel pipe to be inserted downwards to the second set depth of the cement soil pile by the oscillating weight.
In specific implementation, the crane is operated to drive the oscillating weight and the steel pipe to return to the position of the cement soil pile together, and the oscillating weight and the steel pipe are inserted into the center position of the cement soil pile downwards until reaching a second set depth of the cement soil pile.
Referring to fig. 5, fig. 5 is a schematic flow chart of a third embodiment of a construction method for inserting a cement pile into a steel pipe without shock sensation according to the present invention.
Based on the above first embodiment, the cement pile is a stirring pile, and the step S20 specifically includes:
and S21, installing and debugging the stirring pile machine.
Further, in this embodiment, since the cement slurry is continuously poured into the cement pile during the construction process of the stirring pile, the slurry flows out to the ground, and thus, when the stirring pile machine is installed and debugged, slurry trenches with a certain width and depth are dug at two sides of the set position by the excavator, the width of the slurry trenches is 0.8-1 meter, the depth of the slurry trenches is 0.8-1 meter, and when the slurry flows out to the ground, the slurry trenches can flow into two sides, so that the slurry is prevented from affecting the construction plane.
S22, downwards drilling a stirring rod to the third set depth of the cement soil pile;
s23, opening a cement slurry pouring device at the lower end of the stirring rod;
s24, the lower end of the stirring rod moves upwards to the second set depth, and reciprocates between the third set depth and the second set depth to implement a construction mode of six stirring and six spraying;
and S25, the lower end of the stirring rod moves upwards from the second set depth to the top end of the cement soil pile, and reciprocates between the second set depth and the top end to implement a four-stirring and four-spraying construction mode.
And S26, closing the cement paste pouring device, and retracting the stirring rod.
In the concrete implementation, a slurry stirring construction platform is set up on a construction site, 1 cement with 70m is set up, slurry stirring is carried out before starting, 32.5-grade cement is adopted, the cement slurry cannot be isolated, the cement slurry cannot be manufactured according to a preset mixing ratio, a specific gravity meter is used for checking the specific gravity of the cement slurry at any time, in order to prevent the slurry from isolating, the cement slurry is required to be stirred for 30 seconds before discharging, a slurry storage barrel is required to be poured into the slurry stirring system, equipment such as a standby pump is prepared, the slurry stirring and grouting amount is converted according to the square quantity of a reinforced soil body per drill, the grouting pressure is 1.5MPA-2.5 MPA, the slurry conveying capacity is controlled, the cement slurry is injected into a stirring rod in the stirring sinking and lifting process, the sinking speed and the lifting speed are strictly controlled, the sinking speed is controlled to be 0.5m/min-1m/min according to design requirements and relevant technical data, the lifting speed is controlled to be 1m/min-2m/min, the lifting speed is controlled to ensure that the pile is lifted at a constant speed or the original soil body is maintained at a constant speed of 0.8 days after the stirring pile is stirred, and the grouting pressure is properly kept at a constant speed of the bottom part of the soil body per drill, and the original soil body is kept at a constant speed of equal to or more than or equal to 28 days.
Further, in order to ensure that the perpendicularity of the pile body is controlled within a range of 1/200, a walking pile machine is selected, the perpendicularity of the pile body can be strictly controlled by a hydraulic high-leveling system, a roadbed box is paved below a pile frame when necessary, flatness is ensured, when drilling is prevented, the pile frame is inclined, the pile machine is required to be upright, stable and horizontal, 90-degree diagonal monitoring is performed by a theodolite or a level gauge, the deflection of a stirring rod is observed by a specially-assigned person, real-time monitoring is performed, the perpendicularity of the pile body is ensured, the soil body is fully stirred, the sinking and lifting speed of a drilled hole is strictly controlled, so that undisturbed soil is fully crushed, uniform mixing of cement paste and soil is facilitated, a slurry conveying pipeline cannot be blocked in a grouting stage, a slurry breaking phenomenon such as pipeline blocking is not allowed to happen, a pump is stopped immediately, grouting is continued after the treatment is finished, upward lifting and stirring is continued for 10-20 seconds, and the pile breaking is prevented.
Referring to fig. 6, fig. 6 is a schematic flow chart of a construction method of a non-shock-sensation insertion steel pipe for a cement pile according to a fourth embodiment of the present invention.
Based on the first embodiment, before the step S40, the construction method for inserting the cement pile into the steel pipe without shock sensation further includes:
and S30, machining and welding a centering bracket on the steel pipe, so that the steel pipe cannot contact with the side edge of the cement soil pile in the pile sinking process.
It should be noted that, because in the inserting process, the steel pipe length is longer can't guarantee completely that the steel pipe is followed the cement soil pile center sinks, so before the construction to steel pipe processing welding support placed in the middle, so that the steel pipe is in the pile sinking process, support placed in the middle is in the lateral wall of cement soil pile, the steel pipe can not contact cement soil pile side edge, avoids in the sinking process because the steel pipe biasing influences the bulk strength of cement soil steel pipe composite pile.
In the technical scheme of the invention, the cement soil pile can be a stirring pile or a jet grouting pile or a stirring pile or a pressing grouting cement soil pile; and/or the cement-soil steel pipe composite pile can be a foundation pit water-stop support pile or a compression-resistant pile or a pulling-resistant pile or other types of piles.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (6)
1. The construction method of the cement-soil pile shock-sensation-free insertion steel pipe is characterized by comprising the following steps of:
s20, manufacturing a cement soil pile at a set position;
s40, clamping the top end of the steel pipe through a vibration drawing machine, and pre-inserting the steel pipe downwards to a first set depth of the cement soil pile;
step S60, the vibration and extraction machine is separated from the steel pipe, the top end of the steel pipe is clamped by an oscillating weight, and the oscillating weight applies circumferential reciprocating acting force to the steel pipe so that the oscillating weight and the steel pipe move downwards to a second set depth of the cement soil pile;
step S80, the vibration and extraction machine clamps the top end of the oscillating weight, downward pressure is applied to the oscillating weight until the lower end of the steel pipe reaches a third set depth of the cement soil pile, and the cement soil steel pipe composite pile is completed;
in step S60, the oscillating weight includes:
a case;
the eccentric bodies are arranged in the box body along the horizontal direction, and each pair of the eccentric bodies is symmetrically arranged along a first axis in the same vertical direction; the method comprises the steps of,
the clamping claw is fixedly arranged at the lower end of the box body and used for clamping the steel pipe so that the steel pipe is fixedly connected with the oscillating weight;
wherein the jaws are arranged coaxially with the first axis in a vertical direction;
each eccentric body rotates along a second axis in the vertical direction at the same direction and the same rotating speed, and generates a circumferential acting force along the oscillating weight, so that the steel pipe generates a circumferential acting force on cement soil in the lateral direction;
the step S60 specifically includes:
step S61, the vibration and extraction machine is separated from the steel pipe, and the top end of the steel pipe is clamped through the vibration hammer;
step S62, the oscillating weight drives the steel pipe to move upwards to separate from the cement soil pile;
step S63, continuously starting the oscillating weight to enable the soil plug in the steel pipe to vibrate and pour out;
step S64, the oscillating weight drives the steel pipe to be inserted downwards to a second set depth of the cement soil pile;
before step S40, the construction method for inserting the cement-soil pile into the steel pipe without shock sensation further includes:
and S30, machining and welding a centering bracket on the steel pipe, so that the steel pipe cannot contact with the side edge of the cement soil pile in the pile sinking process.
2. The method for constructing a concrete pile free from shock and vibration inserted into a steel pipe according to claim 1, wherein in step S60, a clamping part is fixedly provided at the top end of the oscillating weight, the vibration extractor clamps the clamping part and applies downward pressure to the clamping part until the lower end of the steel pipe reaches the third set depth, thereby completing the concrete pile.
3. The method for constructing a concrete pile non-vibration-induced inserted steel pipe according to claim 1, wherein in step S40, the first set depth is set to a, a is not less than 5m.
4. The method for constructing a concrete pile non-vibration-induced insertion steel pipe according to claim 1, wherein in step S20, the concrete pile is a stirring pile, and step S20 specifically comprises:
s21, installing and debugging a stirring pile machine;
s22, downwards drilling a stirring rod to the third set depth of the cement soil pile;
s23, opening a cement slurry pouring device at the lower end of the stirring rod;
s24, the lower end of the stirring rod moves upwards to the second set depth, and reciprocates between the third set depth and the second set depth to implement a construction mode of six stirring and six spraying;
s25, the lower end of the stirring rod moves upwards from the second set depth to the top end of the cement soil pile, and reciprocates between the second set depth and the top end of the cement soil pile to implement a four-stirring four-spraying construction mode;
and S26, closing the cement paste pouring device, and retracting the stirring rod.
5. The construction method for a cement-soil pile non-vibration-induced insertion steel pipe according to claim 4, wherein in step S21:
and when the stirring pile machine is installed and debugged, a slurry groove with a certain width and depth is dug at two sides of the set position through an excavator, the width of the slurry groove is 0.8-1 m, and the depth of the slurry groove is 0.8-1 m.
6. A method of construction of a non-jarring insertion steel pipe for a cemented pile according to any one of claims 1 to 5, wherein the cemented pile is a stirred pile or a jet grouting pile or a stirred jet grouting pile or a pressure grouting cemented pile; and/or the number of the groups of groups,
the cement soil steel pipe composite pile is a foundation pit water stop support pile or a compression-resistant pile or a pulling-resistant pile or other types of piles.
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