CN115573333A - Calibration pile casing for micro steel pipe mixing pile of soft sea-land interactive deposition silt layer and construction method of mixing pile - Google Patents
Calibration pile casing for micro steel pipe mixing pile of soft sea-land interactive deposition silt layer and construction method of mixing pile Download PDFInfo
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- 238000002156 mixing Methods 0.000 title claims abstract description 86
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- 238000000034 method Methods 0.000 claims description 27
- 238000003825 pressing Methods 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 22
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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
- E02D5/665—Mould-pipes or other moulds for making piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D13/04—Guide devices; Guide frames
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- E—FIXED CONSTRUCTIONS
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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
- E02D5/22—Piles
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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
- E02D5/22—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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention discloses a calibration pile casing of a micro steel pipe mixing pile for a soft sea-land interactive sedimentary sludge layer and a construction method of the mixing pile. The calibration pile casing can ensure the pile forming progress and quality. The invention also discloses a construction method of the mixing pile.
Description
Technical Field
The invention relates to a building component of a sea-land interactive phase deposition sludge layer and a construction method, in particular to a calibration pile casing of a micro steel pipe stirring pile of a soft sea-land interactive phase deposition sludge layer and a construction method of the stirring pile.
Background
In the construction of the micro steel pipe stirring pile of the soft sea-land interactive sedimentary sludge layer, when the pile is formed, on one hand, the construction operation is carried out under the complex stratum environment conditions of the soft sea-land interactive sedimentary sludge layer, the sand layer (more than 5 m) and the like, on the other hand, the cement paste is just injected into the stirring pile and is weak, when the micro steel pipe is inserted, the construction verticality calibration difficulty is large, and in addition, the cement paste is not condensed, the surrounding vibration, the underground water is rich, the slurry gushing and other factors are avoided, so that the phenomena of pile deflection, upward floating, settlement and the like of the micro steel pipe can be frequently caused, the quality is very unsatisfactory, and the pile forming progress and quality can not be ensured. Therefore, aiming at construction under unfavorable geological conditions such as thick sea silt soft stratum, sand bed and the like, the construction process of the steel pipe stirring pile is analyzed, problem guiding is carried out, disease defects are found out, and local adjustment and modification are carried out on the conventional process flow of the steel pipe stirring pile construction in order to achieve the purposes of ideal, reliable and qualified pile forming quality and saving the construction period.
Through years of research, the inventor analyzes the causes of pile-forming defects of the micro steel pipe stirring pile as follows:
the method comprises the following steps of strictly forming the pile according to the construction process steps of the steel pipe mixing pile, carefully referencing the problem condition: and (3) carrying out processes of steel pipe processing and manufacturing, steel pipe positioning clamp embedding, steel pipe hoisting and installation (crane in place, steel pipe hoisting, verticality correction and steel pipe fixing) and the like, and inspecting pile forming quality of the pile body 7 days after concrete pouring is finished. The main causes according to detailed analysis are as follows:
(1) In the construction, the steel pipe positioning card is embedded and deviated in environment construction such as a soft sea silt layer, a sand layer (more than 5 m), soft cement paste and the like, wherein the soft sea silt layer and the sand layer are alternately deposited, and the soft cement paste is relatively weak, and the steel pipe positioning card is deviated in position in a embedding manner, and the foundation soft positioning card is deviated in position by vibration in the construction process, so that the calibration verticality is deviated.
(2) The friction resistance of direct pile pressing is large, a part of the foundation is soft, and a part of the foundation is hard, so that the inclined pile body is formed.
(3) The pile pressing speed is too fast, the pile is formed at one time, and the middle verticality calibration link is not noticed.
(4) After the pile pressing is finished, a finished product is not fixed, and the steel pipe floats upwards due to the problems of surrounding vibration, abundant underground water, slurry surge and the like under the condition that cement mortar is not condensed.
Disclosure of Invention
The invention aims to provide a calibration pile casing for a micro steel pipe mixing pile with a soft sea-land intersection sedimentary sludge layer, which can prevent the phenomena of pile deflection, floating, sedimentation and the like during the construction of the micro steel pipe and ensure the pile forming progress and quality.
The above object of the present invention is achieved by the following technical solutions: the calibration protection cylinder comprises a cylinder body, steel hoops, three supporting legs and calibration bolts, wherein the cylinder body is a steel pipe which is vertically arranged and is provided with two open ends, the steel hoops are arranged around the upper end of the cylinder body along the circumferential direction of the cylinder body and are welded with the cylinder body, the three supporting legs are obliquely arranged, the upper ends of the three supporting legs are fixedly welded on the steel hoops, the steel hoops are trisected, three bolt holes are uniformly formed in the cylinder wall of the cylinder body along the circumferential direction at the same height, the bolt holes are located below the steel hoops, the three calibration bolts are three, the three calibration bolts are respectively and correspondingly installed in the three bolt holes along the radial direction of the cylinder body, projection lines of the central lines of the three supporting legs on the horizontal plane and projection lines of the central lines of the three calibration bolts on the horizontal plane are alternately and uniformly distributed, and the included angles between two adjacent projection lines are 60 degrees.
In the invention, the cylinder body has the size of D168 multiplied by 4mm multiplied by H80cm.
In the invention, the steel hoop is flat steel with the size of 48 multiplied by 4 mm; the distance between the upper edge of the steel hoop and the upper edge of the cylinder body is 5cm.
In the invention, an inclined included angle alpha is formed between the supporting leg and the vertical surface, and the angle of the inclined included angle alpha is more than or equal to 45 degrees and less than or equal to 60 degrees.
In the invention, the bolt holes are phi 16 holes, the distance between the center point of the bolt hole and the upper edge of the cylinder is 20cm, and the calibration bolt is a phi 16 bolt.
The second purpose of the invention is to provide a construction method of a micro steel pipe mixing pile for a soft sea-land mutual deposition sludge layer.
The above object of the present invention is achieved by the following technical solutions: the method for constructing the micro steel pipe mixing pile of the soft sea-land interactive deposition silt layer by adopting the calibration pile casing is characterized by comprising the following steps of: the construction method comprises the following steps:
(1) Manufacturing micro steel pipe and calibrating protective cylinder
Selecting a micro steel pipe, forming a center hole at the top of the micro steel pipe, wherein the distance between the center of the center hole and the upper edge of the micro steel pipe is 25cm, mounting a reinforcing plate on each pipe wall at two sides of the center hole of the micro steel pipe, forming a lifting hole at the position of 5mm of the outer edge of each reinforcing plate, and using the reinforcing plates as lifting lugs of a micro steel pipe verticality calibration lifting hammer and subsequent pile pressing and fixing; manufacturing a calibration pile casing while manufacturing the micro steel pipe;
(2) Watering mixing pile and fixed calibration protection cylinder
Selecting a mixing pile, wherein the mixing pile is provided with a groove, pouring concrete mortar into the mixing pile, measuring the central line of the mixing pile after the mud jacking of the mixing pile is full,
then determining the center line of a calibration pile casing by using a cross line and a plumb bob, placing and fixing the calibration pile casing, enabling the center line of the calibration pile casing to coincide with the center line of the mixing pile, enabling a 1/4 barrel of the calibration pile casing to extend into the mixing pile, and anchoring three supporting legs on the groove edge of the mixing pile groove by using ground bolts;
(3) Drawing and placing calibration point
A level is used for guiding the vertical calibration point to the upper edge of the calibration protection cylinder, and calibration point marks are made;
(4) Pile foundation in-place hoisting micro steel pipe
When the concrete mortar is not condensed, hoisting the micro steel pipe by using a crane, and putting the micro steel pipe into the calibration pile casing to ensure that the lower end of the micro steel pipe is just in contact with the concrete mortar of the mixing pile;
(5) Three-time calibration verticality and three-time pile pressing of miniature steel pipe
And (3) calibrating the verticality for the first time: hanging down a hanging hammer from a hanging hole of the reinforcing plate, wherein the hanging hammer and a calibration point marked on the upper edge of the calibration pile casing are on the same vertical line, so that the verticality of the micro steel pipe meets the requirement, and the micro steel pipe is ensured to be positioned in the center of the mixing pile; then three calibration bolts on the adjustment calibration protecting cylinder for the outer wall of miniature steel pipe is contradicted to calibration bolt's front end, adjusts the straightness that hangs down of miniature steel pipe through precession calibration bolt, once every regulation, calibration bolt's precession adjustment volume is 1.2mm, and the adjustment result will satisfy: the adjustment precision of the miniature steel pipe reaches 1.2mm or more and Q or less than 2.0mm, and the positioning deviation of the miniature steel pipe is less than or equal to 2mm;
pile pressing for the first time: pressing the miniature steel pipe into the mixing pile for 2m by using a pile machine;
and (3) calibrating the verticality for the second time: repeating the first verticality calibration method, and performing second verticality calibration on the micro steel pipe;
and (3) pile pressing for the second time: the micro steel pipe is pressed into the mixing pile for 4m;
and (3) third perpendicularity calibration: repeating the method for calibrating the verticality for the first time, and calibrating the verticality for the third time on the miniature steel pipe;
and (3) third pile pressing: when the micro steel pipe pile is pressed to a distance of 1m from the top, the reinforcing plate and the calibration pile casing are removed, the micro steel pipe is pressed into the mixing pile for 5.75m, and the center hole of the micro steel pipe is flush with the concrete mortar of the mixing pile;
(6) Pile machine displacement
The pile machine shifts, presses the channel-section steel on miniature steel pipe upper end, fixes the channel-section steel on the slot of mixing pile, prevents miniature steel pipe come-up, waits to the concrete mortar solidification back, demolishs the channel-section steel, and miniature steel pipe mixing pile construction is accomplished.
In the invention, the method also comprises light precipitation, and the light precipitation well around the stirring pile is subjected to precipitation while the step (5) and the step (6) are carried out, so that the micro steel pipe is prevented from floating upwards due to abundant underground water.
In the invention, the diameter of the central hole is 10mm; the diameter of the lifting hole is 5mm.
In the invention, the thickness of the reinforcing plate is 1cm, and the length of the reinforcing plate is 6cm.
In the invention, the size of the miniature steel pipe is D108 multiplied by 4mm multiplied by L6m; the diameter of the stirring pile is phi 800mm, and the width of the groove of the stirring pile is 1.2m.
The construction method of the invention is that the mixing pile is used for reinforcing the soft foundation under the geological condition of the soft sea-land mutual deposition silt layer, the mixing pile adopts a single-shaft mixing pile, the diameter of the pile is 800mm, and the center distance of the pile is 600mm; when the cement paste of the mixing pile is not coagulated, a D108 multiplied by 4mm multiplied by L6m pipe is implanted and inserted into the center of the mixing pile to be used as a core, and a steel pipe is embedded into the cement paste, so that a cement paste steel pipe pile body is formed, the section strength of the mixing pile is increased, and the characteristic of high bearing capacity of the steel pipe is exerted.
Meanwhile, the calibration pile casing is utilized to carry out three-calibration verticality (the precision reaches 1.2mm or less and Q is less than or equal to 2.0mm, the steel pipe positioning allowable deviation is 2 mm), three-time pile pressing and the application of the light dewatering well to reduce the water level, the problems of pile deflection, floating and the like are prevented, the pile forming quality meets the requirement, the construction is simple and convenient, secondary grouting is not needed, and the cost is saved.
Compared with the prior art, the invention has the following remarkable effects:
(1) The invention solves the problem of the calibration verticality deviation of the micro steel pipe mixing pile in the construction of environments such as a sea silt layer, a sand layer (more than 5 m) and relatively weak cement paste which are deposited alternately on the weak sea and land in the construction process.
(2) The invention solves the problem that the inclined pile body is caused by large friction resistance of the direct pile pressing of the micro steel pipe mixing pile and the fact that a part of the foundation is soft and a part of the foundation is hard.
(3) The invention solves the problems that the miniature steel pipe stirring pile is too fast in pile pressing speed, the pile is formed at one time, the middle verticality calibration link is not noticed, and the like.
(4) The invention solves the problems that the finished product is not fixed after the miniature steel pipe stirring pile is pressed, and the steel pipe floats upwards due to the problems of peripheral vibration, abundant underground water, slurry surge and the like under the condition that cement mortar is not condensed.
By applying the technology, the invention solves the problems of reinforcing construction of complex sea sludge layers and sand layers deposited alternately on weak sea and land and the problems of unsatisfactory quality of deviated piles, floating, settlement and the like, simplifies the construction procedures of drilling, hammer striking, secondary grouting and the like, and has the advantages of easy regulation of pile length, simple and convenient construction and strong reliability. The soil body is not disturbed and extruded in the construction process, the influence on surrounding adjacent buildings (structures) is small, the discharged sewage and mud are less, and the effects of civilized construction, environmental protection and energy conservation can be achieved. And the quality of the formed pile meets the requirements, the construction is simple and convenient, secondary grouting is not needed, and the cost is saved. The construction scheme is scientific, accurate, reliable and high in safety, and the expected effect is achieved.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the calibration sleeve of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural view of a micro steel pipe in the mixing pile of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic structural view of a micro steel tube suspension drop hammer in the mixing pile of the present invention;
FIG. 6 is a schematic diagram of the arrangement of mixing piles according to the present invention, with adjacent mixing piles intersecting;
FIG. 7 is a schematic structural view of one construction of the mixing pile of the present invention;
FIG. 8 is a schematic structural view of a second embodiment of the mixing pile of the present invention, wherein the fixed alignment casing is completed;
FIG. 9 is a schematic structural view of a third construction of the mixing pile of the present invention, in which the micro steel pipes are suspended;
FIG. 10 is a schematic structural view showing the fourth construction of the mixing pile of the present invention, in which the micro steel pipe is pressed.
Description of the reference numerals
The method comprises the following steps of 1-cylinder body, 2-steel hoop, 3-supporting foot, 4-calibration bolt, 5-micro steel pipe, 51-center hole, 6-reinforcing plate, 61-hanging hole, 7-stirring pile and 8-groove.
Detailed Description
The calibration pile casing for the soft and weak sea-land interaction deposited silt layer micro steel pipe stirring pile comprises a cylinder body 1, steel hoops 2, supporting legs 3 and calibration bolts 4, wherein the cylinder body 1 is a vertically arranged steel pipe with two open ends, the steel hoops 2 surround the upper end of the cylinder body 1 along the circumferential direction of the cylinder body 1 and are welded with the cylinder body 1, the supporting legs 3 are three, the three supporting legs 3 are obliquely arranged, the upper ends of the three supporting legs 3 are fixedly welded on the steel hoops 2, the steel hoops 2 are trisected, included angles among projection lines of central lines of the three supporting legs 3 on a horizontal plane are 120 degrees, three bolt holes are uniformly formed in the cylinder wall of the cylinder body 1 along the circumferential direction at the same height, included angles among the bolt holes are 120 degrees, the bolt holes are located below the steel hoops 2, the calibration bolts 4 are three, the three calibration bolts 4 are respectively and correspondingly installed in the three bolt holes along the radial direction of the cylinder body 1, projection lines of the central lines of the three supporting legs 3 and the central lines of the three calibration bolts 4 on the horizontal plane are uniformly distributed in an alternating manner, and included angles among two adjacent projection lines are 60 degrees.
In this embodiment, the cylinder 1 has dimensions D168 × 4mm × H80cm, i.e., the cylinder 1 has an outer diameter of 168mm, a wall thickness of 4mm, and a length of 80cm.
The steel hoop 2 is flat steel with the size of 48 multiplied by 4mm, namely the width of the steel hoop 2 is 48mm, and the distance between the upper edge of the steel hoop 2 with the thickness of 4mm and the upper edge of the cylinder body 1 is 5cm.
An inclined included angle alpha of 45 degrees is formed between the supporting leg 3 and the vertical surface, and the inclined included angle alpha can also be selected within the range of alpha being more than or equal to 45 degrees and less than or equal to 60 degrees.
The bolt holes are phi 16 holes, the distance between the center point of each bolt hole and the upper edge of the barrel body 1 is 20cm, and the calibration bolts 4 are phi 16 bolts.
In the process of pile forming, the difficulty of verticality calibration in construction in environments such as a sea silt layer and a sand layer (more than 5 m) deposited by interaction between soft sea and land, and soft cement paste is high, and in addition, cement mortar is not condensed, is vibrated around, is rich in underground water, and is a main reason for causing pile deviation and floating, the process of the steel pipe stirring pile is improved through research, and the problems are solved by adopting the following method.
The method for constructing the micro steel pipe mixing pile of the soft sea-land interactive deposition sludge layer by adopting the calibration pile casing comprises the following steps:
(1) Manufacturing of micro steel pipe 5 and calibration casing
As shown in fig. 3 and 4, a micro steel pipe 5 with the size of D108 × 4mm × L6m is selected, that is, the outer diameter of the micro steel pipe 5 is 108mm, the wall thickness is 4mm, and the length is 6m, a central hole 51 with the diameter of 10mm is formed in the top of the micro steel pipe 5, the central hole 51 is used for lifting and correcting the micro steel pipe 5 to uniformly drop to the central position of the mixing pile, the distance between the center of the central hole 51 and the upper edge of the micro steel pipe 5 is 25cm, the micro steel pipe 5 is provided with a reinforcing plate 6 with the thickness of 1cm and the length of 6cm on the pipe wall on both sides of the central hole 51, a lifting hole 61 is formed in the position 5mm outside the outer edge of the reinforcing plate 6, that is, that the corresponding hole center is 52.5mm away from the outer wall of the steel pipe, the diameter of the lifting hole is 5mm, and the reinforcing plate 6 is used as a lifting lug (as shown in fig. 5) of a micro steel pipe verticality 5 calibration lifting hammer and subsequent pile pressing and fixing; manufacturing a calibration pile casing while manufacturing the micro steel pipe 5;
(2) Watering mixing pile 7 and fixed calibration casing
As shown in fig. 6, the diameter of the mixing pile 7 is phi 800mm, the width of the groove 8 of the mixing pile 7 is 1.2m, the mixing pile 7 is filled with concrete mortar, after the mixing pile 7 is pressed to be full, the central line of the mixing pile 7 is measured,
then, determining the center line of a calibration pile casing by using a cross line and a plumb bob, placing and fixing the calibration pile casing, enabling the center line of the calibration pile casing to coincide with the center line of the mixing pile 7, enabling a 1/4 barrel 1 of the calibration pile casing to extend into the mixing pile 7, and anchoring three supporting legs 3 on the edge of a groove 8 of the mixing pile 7 by using bolts;
(3) Drawing and placing calibration point
A level is used for guiding the vertical calibration point to the upper edge of the calibration protection cylinder, and calibration point marks are made;
(4) Pile foundation in-place hoisting micro steel pipe 5
When the concrete mortar is not condensed, hoisting the micro steel pipe 5 by using a 25-ton crane, and putting the micro steel pipe into the calibration pile casing, so that the lower end of the micro steel pipe 5 is just in contact with the concrete mortar of the mixing pile 7;
(5) The three times of perpendicularity calibration and three times of pile pressing of the micro steel pipe 5 are carried out, the process is shown in figures 7 to 10,
and (3) calibrating the verticality for the first time: hanging down a hanging hammer from a hanging hole 61 of the reinforcing plate 6, wherein the hanging hammer and a calibration point marked on the upper edge of the calibration pile casing are on the same vertical line, so that the verticality of the micro steel pipe 5 meets the requirement, and the micro steel pipe 5 is ensured to be positioned at the center of the mixing pile 7; then three calibration bolts 4 on the adjustment calibration protecting cylinder for the outer wall of miniature steel pipe 5 is contradicted to calibration bolt 4's front end, adjusts miniature steel pipe 5's straightness that hangs down through precession calibration bolt 4, and every regulation is once, and calibration bolt 4's precession adjustment volume is 1.2mm, and the adjustment result will satisfy: the adjustment precision of the micro steel pipe 5 reaches 1.2mm and Q is less than or equal to 2.0mm, wherein Q is the measuring distance between the threads of the screw, the positioning deviation of the micro steel pipe 5 is less than or equal to 2mm, the deviation refers to the deviation of perpendicularity, and the maximum deviation cannot be greater than 2mm;
pile pressing for the first time: a mechanical vibration hammer with the model number of by-vh400 is used as a pile driver to press the miniature steel pipe 5, and the miniature steel pipe 5 is pressed into a stirring pile for 72m;
and (3) calibrating the verticality for the second time: repeating the first perpendicularity calibration method, and performing second perpendicularity calibration on the micro steel pipe 5;
and (3) pile pressing for the second time: the micro steel pipe 5 is pressed into the mixing pile 74m;
and (3) third verticality calibration: repeating the first verticality calibration method, and performing third verticality calibration on the micro steel pipe 5;
and (3) third pile pressing: when the pile of the micro steel pipe 5 is pressed to a distance of 1m from the top, the reinforcing plate 6 and the calibration pile casing are removed, the micro steel pipe 5 is pressed into the mixing pile 75.75m, and the central hole 51 of the micro steel pipe 5 is flush with the concrete mortar of the mixing pile 7;
(6) Pile machine displacement
The pile driver is shifted, channel steel is pressed on the upper end of the micro steel pipe 5, the channel steel is fixed on a groove 8 of the mixing pile 7, the micro steel pipe 5 is prevented from floating upwards, the channel steel is removed after concrete mortar is solidified, and the construction of the micro steel pipe mixing pile is completed;
(7) Light precipitation
And (5) properly dewatering the light dewatering well around the mixing pile 7 at the same time of the step (5) and the step (6), and preventing the micro steel pipe 5 from floating up due to abundant underground water.
The construction method of the mixing pile achieves the following good technical effects:
1. the cement slurry stirred by the steel pipe stirring pile is combined with the soft sea mud to form a reinforcing body, the bearing capacity strength is high, the precision of the quasi-verticality reaches 1.2mm and is not more than Q and not more than 2.0mm, the allowable deviation of the positioning of the steel pipe is 2mm, and the problems of pile deviation, upward floating, settlement and the like are solved; the horizontal resistance is increased, the transverse displacement is avoided, and the anti-overturning and impact capabilities are enhanced.
2. The steel pipe is directly implanted under the condition that cement paste is not condensed, the mixing pile and the steel pipe are easy to form a combined body, the construction procedures of drilling, hammer striking, secondary grouting and the like are simplified, the pile length is easy to adjust, the construction is simple and convenient, and the reliability is high.
3. The soil body is not disturbed or extruded in the construction process, the influence on surrounding adjacent buildings (structures) is small, the discharged sewage and mud are less, and the effects of civilized construction, environmental protection and energy conservation can be achieved.
4. The quality of the pile is qualified and meets the requirement, the construction is simple and convenient, secondary grouting is not needed, and the cost is saved.
Meanwhile, the construction method is also suitable for construction sites which are narrow and adjacent to buildings, pipelines and other sites, and can be used for advanced support during foundation pit excavation, so that the deformation of surrounding soil bodies is restrained, the pressure of the soil bodies is borne in advance, and a large empty face cannot be formed.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (10)
1. The calibration of the mutual phase deposit silt layer miniature steel pipe mixing pile of weak sea and land protects a section of thick bamboo, its characterized in that: the calibration protection cylinder comprises a cylinder body (1), steel hoops (2), supporting legs (3) and calibration bolts (4), wherein the cylinder body (1) is a vertically-arranged steel pipe with two openings at two ends, the steel hoops (2) are circumferentially wound at the upper end of the cylinder body (1) along the cylinder body (1) and are welded with the cylinder body (1), the three supporting legs (3) are obliquely arranged, the upper ends of the three supporting legs (3) are fixedly welded on the steel hoops (2) respectively, the steel hoops (2) are trisected, three bolt holes are uniformly formed in the cylinder wall of the cylinder body (1) at the same height along the circumferential direction, the bolt holes are located below the steel hoops (2), the three calibration bolts (4) are radially and correspondingly installed in the three bolt holes along the cylinder body (1), the projection lines of the center lines of the three supporting legs (3) on the horizontal plane and the projection lines of the three calibration bolts (4) on the horizontal plane are uniformly distributed in an alternating shape, and the included angle between every two adjacent projection lines is 60 degrees.
2. The calibration pile casing of the weak sea-land interactive sedimentary sludge layer micro steel pipe mixing pile according to claim 1, characterized in that: the cylinder (1) has the size of D168 multiplied by 4mm multiplied by H80cm.
3. The calibration pile casing of the weak sea-land interactive sedimentary sludge layer micro steel pipe mixing pile according to claim 1, characterized in that: the steel hoop (2) is flat steel with the size of 48 multiplied by 4 mm; the distance between the upper edge of the steel hoop (2) and the upper edge of the cylinder body (1) is 5cm.
4. The calibration pile casing of the weak sea-land interactive deposition sludge layer micro steel pipe stirring pile according to claim 1, which is characterized in that: an inclined included angle alpha is formed between the supporting leg (3) and the vertical surface, and the angle of the inclined included angle alpha is more than or equal to 45 degrees and less than or equal to 60 degrees.
5. The calibration pile casing of the weak sea-land interactive deposition sludge layer micro steel pipe stirring pile according to claim 1, which is characterized in that: the bolt holes are phi 16 holes, the distance between the center point of each bolt hole and the upper edge of the barrel (1) is 20cm, and the calibration bolts (4) are phi 16 bolts.
6. The method for constructing the micro steel pipe mixing pile of the soft sea-land alternate deposition sludge layer by adopting the calibration protection sleeve of any one of claims 1 to 5 is characterized in that: the construction method comprises the following steps:
(1) Manufacturing miniature steel pipe and calibrating protective cylinder
Selecting a micro steel pipe, forming a center hole at the top of the micro steel pipe, wherein the distance between the center of the center hole and the upper edge of the micro steel pipe is 25cm, respectively mounting a reinforcing plate on the pipe wall at two sides of the center hole of the micro steel pipe, forming a lifting hole at the position of 5mm of the outer edge of the reinforcing plate, and using the reinforcing plate as a lifting lug of a micro steel pipe verticality calibration lifting hammer and a subsequent pile pressing and fixing; manufacturing a calibration protective sleeve while manufacturing the miniature steel pipe;
(2) Watering mixing pile and fixed calibration pile casing
Selecting a mixing pile, wherein the mixing pile is provided with a groove, pouring concrete mortar into the mixing pile, measuring the central line of the mixing pile after the mud jacking of the mixing pile is full,
then determining the center line of a calibration pile casing by using a cross line and a plumb bob, placing and fixing the calibration pile casing, enabling the center line of the calibration pile casing to coincide with the center line of the mixing pile, enabling a 1/4 barrel of the calibration pile casing to extend into the mixing pile, and anchoring three supporting legs on the groove edge of the mixing pile groove by using ground bolts;
(3) Drawing and placing calibration point
A level is used for guiding the vertical calibration point to the upper edge of the calibration protection cylinder, and calibration point marks are made;
(4) Pile foundation in-place hoisting micro steel pipe
When the concrete mortar is not condensed, hoisting the micro steel pipe by using a crane, and putting the micro steel pipe into the calibration pile casing to ensure that the lower end of the micro steel pipe is just contacted with the concrete mortar of the mixing pile;
(5) Three-time calibration verticality and three-time pile pressing of miniature steel pipe
And (3) calibrating the verticality for the first time: hanging down a hanging hammer from a hanging hole of the reinforcing plate, wherein the hanging hammer and a calibration point marked on the upper edge of the calibration pile casing are on the same vertical line, so that the verticality of the micro steel pipe meets the requirement, and the micro steel pipe is ensured to be positioned in the center of the mixing pile; then three calibration bolts on the adjustment calibration pile casing for the straightness that hangs down of miniature steel pipe is adjusted through precession calibration bolt to calibration bolt's front end conflict miniature steel pipe's outer wall, and every regulation is once, and calibration bolt's precession adjustment volume is 1.2mm, and the adjustment result will satisfy: the adjustment precision of the miniature steel pipe reaches 1.2mm or more and Q or less than 2.0mm, and the positioning deviation of the miniature steel pipe is less than or equal to 2mm;
pile pressing for the first time: pressing the miniature steel pipe into the mixing pile for 2m by using a pile machine;
and (3) second perpendicularity calibration: repeating the method for calibrating the verticality for the first time, and calibrating the verticality for the second time on the miniature steel pipe;
and (3) pile pressing for the second time: the micro steel pipe is pressed into the mixing pile for 4m;
and (3) third perpendicularity calibration: repeating the method for calibrating the verticality for the first time, and calibrating the verticality of the miniature steel pipe for the third time;
and (3) third pile pressing: when the micro steel pipe pile is pressed to a distance of 1m from the top, the reinforcing plate and the calibration pile casing are removed, the micro steel pipe is pressed into the mixing pile for 5.75m, and the center hole of the micro steel pipe is flush with the concrete mortar of the mixing pile;
(6) Pile machine displacement
The pile machine shifts, presses the channel-section steel on miniature steel pipe upper end, fixes the channel-section steel on the slot of mixing pile, prevents miniature steel pipe come-up, waits to the concrete mortar solidification back, demolishs the channel-section steel, and miniature steel pipe mixing pile construction is accomplished.
7. The construction method according to claim 6, wherein: the method also comprises light precipitation, and the light precipitation well around the stirring pile is subjected to precipitation while the step (5) and the step (6) are carried out, so that the micro steel pipe is prevented from floating upwards due to abundant underground water.
8. The construction method according to claim 6, wherein: the diameter of the central hole is 10mm, and the diameter of the lifting hole is 5mm.
9. The construction method according to claim 6, wherein: the thickness of the reinforcing plate is 1cm, and the length of the reinforcing plate is 6cm.
10. The construction method according to claim 6, wherein: the size of the miniature steel pipe is D108 multiplied by 4mm multiplied by L6m; the diameter of the stirring pile is phi 800mm, and the width of a groove of the stirring pile is 1.2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211075583.5A CN115573333B (en) | 2022-09-02 | Calibration pile casing of mini-type steel pipe mixing pile for soft sea Liu Jiaohu phase sediment silt layer and construction method of mixing pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211075583.5A CN115573333B (en) | 2022-09-02 | Calibration pile casing of mini-type steel pipe mixing pile for soft sea Liu Jiaohu phase sediment silt layer and construction method of mixing pile |
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| Publication Number | Publication Date |
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| CN115573333A true CN115573333A (en) | 2023-01-06 |
| CN115573333B CN115573333B (en) | 2024-05-03 |
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