CN115573333B - 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 - Google Patents
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 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 178
- 239000010959 steel Substances 0.000 title claims abstract description 178
- 238000010276 construction Methods 0.000 title claims abstract description 57
- 239000013049 sediment Substances 0.000 title claims abstract description 10
- 238000002156 mixing Methods 0.000 title claims description 27
- 238000003756 stirring Methods 0.000 claims abstract description 76
- 238000003825 pressing Methods 0.000 claims description 26
- 230000003014 reinforcing effect Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 239000004570 mortar (masonry) Substances 0.000 claims description 17
- 238000007667 floating Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 8
- 239000003673 groundwater Substances 0.000 claims description 6
- 230000002262 irrigation Effects 0.000 claims description 3
- 238000003973 irrigation Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 description 12
- 239000002002 slurry Substances 0.000 description 9
- 239000004576 sand Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- 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
-
- 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
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
Abstract
The invention discloses a calibration pile casing of a mini-type steel pipe stirring pile for a soft sea Liu Jiaohu phase sediment silt layer and a construction method of the stirring pile. The calibration pile casing can ensure pile forming progress and quality. The invention also discloses a construction method of the stirring pile.
Description
Technical Field
The invention relates to a building component of a sea Liu Jiaohu phase deposited silt layer and a construction method, in particular to a calibration pile casing of a weak sea Liu Jiaohu phase deposited silt layer miniature steel pipe mixing pile and a construction method of the mixing pile.
Background
In the construction of a miniature steel pipe stirring pile with a soft sea Liu Jiaohu phase deposited silt layer, on one hand, construction operation is carried out under complex stratum environment conditions such as a soft sea Liu Jiaohu phase deposited silt layer, a sand layer (more than 5 m) and the like, on the other hand, cement paste is just injected into the stirring pile to be softer, when the miniature steel pipe is inserted, the construction calibration perpendicularity difficulty is high, and in addition, cement mortar does not have factors such as condensation, surrounding vibration, abundant groundwater, slurry surge and the like, phenomena such as miniature steel pipe deflection pile, floating, sedimentation and the like often occur, so that the quality is quite unsatisfactory, and the pile forming progress and quality cannot be ensured. Therefore, aiming at construction under poor geological conditions such as thick sea silt weak stratum, sand layer and the like, the aim of ideal, reliable and qualified pile forming quality and saving construction period is fulfilled, the construction process of the steel pipe mixing pile is analyzed, the problem is guided, the disease defect is found out, and the conventional process flow of the construction of the steel pipe mixing pile is locally adjusted and modified.
Through years of research, the inventor analyzes the pile forming defect reasons of the miniature steel pipe stirring pile as follows:
Forming the pile strictly according to the construction flow steps of the steel pipe mixing pile, and carefully referencing the problem conditions: the method comprises the steps of steel pipe machining and manufacturing, steel pipe positioning clamping embedding, hanging and installing steel pipes (hanging and placing a crane in place, hanging and placing the steel pipes, correcting verticality, fixing the steel pipes) and the like, and checking pile forming quality of a pile body after concrete pouring is finished for 7 days. The main causes according to the detailed analysis are as follows:
(1) The construction of environments such as a sea silt layer, a sand layer (more than 5 m), a cement slurry which are deposited by the soft sea Liu Jiaohu during construction is carried out, on one hand, the embedded deflection of the steel pipe positioning clamp is carried out, and on the other hand, the vibration deflection of the foundation soft positioning clamp during construction is carried out, so that the deviation of the calibration verticality is caused.
(2) The direct pile pressing friction force has high resistance, and the foundation part is soft and the foundation part is harder, so that the inclined pile body is formed.
(3) The pile pressing speed is too high, the pile is formed once, and middle calibration perpendicularity links and the like are not noticed.
(4) After pile pressing is finished, the finished product is not fixed, and under the condition that cement mortar is not coagulated, the steel pipe floats upwards due to the problems of surrounding vibration, abundant groundwater, slurry flushing and the like.
Disclosure of Invention
The invention aims to provide a calibration pile casing for a miniature steel pipe stirring pile in a soft sea Liu Jiaohu phase sediment silt layer, which can prevent phenomena of pile deflection, floating, sedimentation and the like during construction of miniature steel pipes and ensure pile forming progress and quality.
The above object of the present invention is achieved by the following technical solutions: the calibrating protection cylinder comprises a cylinder body, steel hoops, supporting feet and calibrating bolts, wherein the cylinder body is a steel pipe with two ends being vertically arranged and provided with openings, the steel hoops encircle 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 feet are obliquely arranged, the upper ends of the three supporting feet are fixedly welded on the steel hoops and are trisected with the steel hoops, three bolt holes are uniformly formed in the circumferential direction of the cylinder wall of the cylinder body at the same height, the bolt holes are positioned below the steel hoops, the three calibrating bolts are correspondingly arranged in the three bolt holes along the radial direction of the cylinder body, projection lines of the central lines of the three supporting feet on the horizontal plane are uniformly distributed in an alternating mode with those of the central lines of the three calibrating bolts on the horizontal plane, and included angles between the two adjacent projection lines are 60 degrees.
In the invention, the size of the cylinder is D168×4mm×H280 cm.
In the invention, the steel hoop is flat steel with the size of 48 multiplied by4 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 hole is a phi 16 hole, the distance between the center point of the bolt hole and the upper edge of the cylinder body is 20cm, and the calibration bolt is a phi 16 bolt.
The second purpose of the invention is to provide a construction method of the mini-type steel pipe mixing pile for the soft sea Liu Jiaohu phase sediment silt layer.
The above object of the present invention is achieved by the following technical solutions: the method for constructing the mini-type steel pipe mixing pile for the soft sea Liu Jiaohu-phase sediment 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 miniature steel tube and calibration casing
Selecting a miniature steel pipe, arranging a central hole at the top of the miniature steel pipe, wherein the distance between the center of the central hole and the upper edge of the miniature steel pipe is 25cm, respectively installing a reinforcing plate on the pipe walls positioned at two sides of the central hole, arranging a hanging hole at the 5mm position of the outer edge of the reinforcing plate, and using the reinforcing plate as a lifting lug of a miniature steel pipe verticality calibration hanging hammer and a follow-up pile pressing and fixing; manufacturing a calibration protection cylinder while manufacturing a miniature steel pipe;
(2) Irrigation stirring pile and fixed calibration casing
Selecting a stirring pile, wherein the stirring pile is provided with a groove, the stirring pile is filled with concrete mortar, after the grouting of the stirring pile reaches the full of the mortar, the central line of the stirring pile is measured,
Then, determining the central line of the calibration protection cylinder by using a cross line and a plumb bob, placing and fixing the calibration protection cylinder so that the central line of the calibration protection cylinder coincides with the central line of the stirring pile, enabling 1/4 cylinder of the calibration protection cylinder to extend into the stirring pile, and anchoring three supporting feet on the edges of the stirring pile groove by using ground bolts;
(3) Calibration point for guiding and placing
A vertical calibration point is led to the upper edge of the calibration casing by a level gauge, and a calibration point mark is made;
(4) Pile foundation in-place hanging miniature steel pipe
When the concrete mortar is not coagulated, a crane is used for hoisting the miniature steel pipe and placing the miniature steel pipe into the calibration pile casing, so that the lower end of the miniature steel pipe is just contacted with the concrete mortar of the stirring pile;
(5) Three-time calibration verticality and three-time pile pressing of miniature steel pipe
First perpendicularity calibration: 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 casing are positioned on the same vertical line, so that the verticality of the miniature steel pipe meets the requirement, and the miniature steel pipe is ensured to be positioned at the center of the stirring pile; then three calibration bolts on the adjustment calibration pile casing for the front end of calibration bolt contradicts the outer wall of miniature steel pipe, adjusts the straightness that hangs down of miniature steel pipe through precession calibration bolt, and once adjust, the precession adjustment volume of calibration bolt is 1.2mm, and the adjustment result is to satisfy: the adjustment precision of the miniature steel tube is 1.2mm or more and Q or less than 2.0mm or less, and the positioning deviation of the miniature steel tube is 2mm or less;
pile pressing for the first time: pile pressing is carried out on the miniature steel pipes by adopting a pile machine, and the miniature steel pipes are pressed into the stirring pile for 2m;
Second perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out second perpendicularity calibration on the miniature steel tube;
And (5) pile pressing for the second time: the miniature steel tube is pressed into the stirring pile for 4m;
Third perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out third perpendicularity calibration on the miniature steel tube;
Thirdly, pile pressing: when the miniature steel pipe pile is pressed to be 1m away from the top, the reinforcing plate and the calibration pile casing are removed, the miniature steel pipe is pressed into the stirring pile for 5.75m, and at the moment, the central hole of the miniature steel pipe is flush with the concrete mortar of the stirring pile;
(6) Pile driver shift
And (3) shifting the pile machine, pressing channel steel at the upper end of the miniature steel pipe, fixing the channel steel on a groove of the stirring pile, preventing the miniature steel pipe from floating upwards, and dismantling the channel steel after the concrete mortar is solidified, so that the construction of the miniature steel pipe stirring pile is completed.
In the invention, the method also comprises light precipitation, and the light precipitation wells around the stirring piles are subjected to precipitation at the same time of the step (5) and the step (6), so that the condition that the micro steel pipes float upwards due to abundant underground water is prevented.
In the invention, the diameter of the central hole is 10mm; the diameter of the hanging 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 dimension of the miniature steel tube 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 stirring pile is used for reinforcing the soft foundation under the geological condition of the soft sea Liu Jiaohu phase sediment silt layer, the stirring pile adopts a single-shaft stirring pile with the diameter of 800mm and the center distance of 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 cement paste as a core, and the 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 perform three-calibration verticality (the precision is more than or equal to 1.2mm and less than or equal to 2.0mm, the steel pipe positioning allowance deviation is 2 mm), three-time pile pressing and the application of a light precipitation well to reduce the water level, so that the problems of pile deflection, floating and the like are prevented, the pile forming quality is qualified and meets the requirements, the construction is simple and convenient, the 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 deviation of the calibration verticality of the miniature steel pipe mixing pile in construction due to the environments of a sea silt layer, a sand layer (more than 5 m), a cement slurry which are deposited in the weak sea Liu Jiaohu phase in construction.
(2) The invention solves the problems of inclined pile body caused by large friction force resistance of direct pile pressing of the miniature steel pipe mixing pile and soft part and harder part of the foundation.
(3) The invention solves the problems that the pile pressing speed of the miniature steel pipe mixing pile is too high, the pile is formed at one time, the middle calibration perpendicularity link is not noticed, and the like.
(4) The invention solves the problem that the finished product is not fixed after the mini-type steel pipe mixing pile is pressed, and the steel pipe floats up due to the problems of surrounding vibration, abundant groundwater, slurry surge and the like under the condition that cement mortar is not coagulated.
By applying the technology, the invention solves the problems of the reinforcing construction of the sea silt layer and the sand layer which are deposited in the weak sea Liu Jiaohu and the complex stratum and the poor quality of the offset pile, the floating, the sedimentation and the like, simplifies the construction procedures of drilling, hammer beating, secondary grouting and the like, has 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, sewage and mud are less, and the environment-friendly and energy-saving effect of civilized construction can be achieved. And the pile forming quality 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 achieves the expected effect.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of the structure of the calibration cage of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural view of a miniature steel pipe in the mixing pile according to the invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic structural view of a miniature steel pipe hanging sling hammer in the mixing pile of the invention;
FIG. 6 is a schematic diagram of the arrangement of mixing piles according to the present invention, adjacent mixing piles being crossed;
FIG. 7 is a schematic view of one of the constructions of the mixing pile of the present invention;
FIG. 8 is a schematic structural view of a second construction of the mixing pile of the present invention, with the fixed alignment casing completed;
FIG. 9 is a schematic view of the construction of a third stirring pile according to the present invention, in which the hanging of the micro steel pipes is completed;
FIG. 10 is a schematic structural view of a fourth construction of the mixing pile of the present invention, in which miniature steel pipes are compressed.
Description of the reference numerals
1-Cylinder, 2-steel hoop, 3-supporting leg, 4-calibration bolt, 5-miniature steel pipe, 51-centre hole, 6-reinforcing plate, 61-hanging hole, 7-stirring pile, 8-slot.
Detailed Description
As shown in fig. 1 and 2, the calibration casing of the mini-type steel pipe mixing pile for the weak sea Liu Jiaohu phase sediment silt layer comprises a barrel 1, a steel hoop 2, supporting legs 3 and calibration bolts 4, wherein the barrel 1 is a steel pipe with two ends open and is arranged vertically, the steel hoop 2 circumferentially surrounds the upper end of the barrel 1 and is welded with the barrel 1, the three supporting legs 3 are obliquely arranged, the upper ends of the three supporting legs 3 are fixedly welded on the steel hoop 2, the steel hoop 2 is trisected, the included angles between projection lines of the central lines of the three supporting legs 3 on the horizontal plane are 120 degrees, three bolt holes are uniformly formed in the barrel wall of the barrel 1 along the circumferential direction on the same height, the included angles between the bolt holes are 120 degrees, the bolt holes are positioned below the steel hoop 2, the three calibration bolts 4 are respectively and correspondingly arranged in the three bolt holes along the radial direction of the barrel 1, projection lines of the central lines of the three supporting legs 3 and the projection lines of the three calibration bolts 4 on the horizontal plane are alternately and uniformly distributed between two adjacent projection lines of the central lines of the three calibration bolts 4 on the horizontal plane, and the included angles between the projection lines are 60 degrees.
In this example, the dimensions of the cylinder 1 were D168X 4mm X H80cm, i.e. the outside diameter of the cylinder 1 was 168mm, the wall thickness was 4mm and the length was 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 1 is 5cm.
The supporting leg 3 and the vertical surface have an inclined included angle alpha of 45 degrees, and the inclined included angle alpha can be valued within the range of more than or equal to 45 degrees and less than or equal to 60 degrees.
The bolt hole is phi 16 hole, the distance between the center point of the bolt hole and the upper edge of the cylinder body 1 is 20cm, and the calibration bolt 4 is phi 16 bolt.
When piling, the problems are overcome by improving the process of the steel pipe stirring pile through research because the sea silt layer, the sand layer (more than 5 m), the cement slurry are softer and the like which are deposited in the soft sea Liu Jiaohu phase and the environment construction such as the cement slurry is more difficult to calibrate the verticality, and the cement slurry is not coagulated, vibrates around, contains abundant groundwater, gushes slurry and the like which are the main reasons for causing the deflection pile and the floating.
The method for constructing the mini-type steel pipe mixing pile in the soft sea Liu Jiaohu phase sediment silt layer by adopting the calibration pile casing comprises the following steps:
(1) Manufacturing miniature steel tube 5 and calibration casing
As shown in fig. 3 and 4, a miniature steel pipe 5 with the dimension of D108 x 4mm x L6m is selected, namely, the outer diameter of the miniature steel pipe 5 is 108mm, the wall thickness is 4mm, the length is 6m, a central hole 51 with the diameter of 10mm is formed in the top of the miniature steel pipe 5, the central hole 51 is used for lifting and correcting the miniature steel pipe 5 to uniformly drop to the central position of a stirring pile, the distance between the circle center of the central hole 51 and the upper edge of the miniature steel pipe 5 is 25cm, a reinforcing plate 6 with the thickness of 1cm and the length of 6cm is respectively arranged on the pipe walls positioned on two sides of the central hole 51 of the miniature steel pipe 5, a hanging hole 61 is formed in the position of the outer edge 5mm of the reinforcing plate 6, namely, the position of the corresponding hole is 52.5mm away from the outer wall of the steel pipe, the diameter of the hanging hole is 5mm, and the reinforcing plate 6 is used as a lifting lug (as shown in fig. 5) of a lifting hammer for calibrating the verticality of the miniature steel pipe 5 and a follow-up pile; manufacturing a calibration casing while manufacturing the miniature steel tube 5;
(2) Irrigation stirring pile 7 and fixed calibration casing
As shown in fig. 6, the diameter of the stirring pile 7 is Φ800mm, the width of the groove 8 of the stirring pile 7 is 1.2m, the stirring pile 7 is filled with concrete mortar, after the grouting of the stirring pile 7 is completed, the center line of the stirring pile 7 is measured,
Then, a central line of the calibration protection barrel is determined by using a cross line and a plumb bob, the calibration protection barrel is placed and fixed, so that the central line of the calibration protection barrel coincides with the central line of the stirring pile 7, a 1/4 barrel 1 of the calibration protection barrel extends into the stirring pile 7, and three supporting legs 3 are anchored on the groove edges of the grooves 8 of the stirring pile 7 by using ground bolts;
(3) Calibration point for guiding and placing
A vertical calibration point is led to the upper edge of the calibration casing by a level gauge, and a calibration point mark is made;
(4) Pile foundation in-place hanging miniature steel pipe 5
When the concrete mortar is not coagulated, a 25 ton crane is used for lifting the miniature steel pipe 5 and the miniature steel pipe 5 is placed into a calibration pile casing, so that the lower end of the miniature steel pipe 5 is just contacted with the concrete mortar of the stirring pile 7;
(5) The miniature steel tube 5 is calibrated for three times for verticality and three times for pile pressing, the process is shown in figures 7 to 10,
First perpendicularity calibration: hanging down a hanging weight from a hanging hole 61 of the reinforcing plate 6, wherein the hanging weight and a calibration point marked on the upper edge of the calibration casing are positioned on the same vertical line, so that the verticality of the miniature steel pipe 5 meets the requirement, and the miniature steel pipe 5 is ensured to be positioned at the center of the stirring pile 7; then three calibration bolts 4 on the adjustment calibration pile casing for the front end of calibration bolt 4 contradicts miniature steel pipe 5's outer wall, adjusts miniature steel pipe 5's straightness that hangs down through precession calibration bolt 4, and once for every adjustment, the precession adjustment volume of calibration bolt 4 is 1.2mm, and the adjustment result should satisfy: the adjustment precision of the miniature steel tube 5 is not more than 1.2mm and not more than 2.0mm, wherein Q is the measurement interval between wires of the screw, the positioning deviation of the miniature steel tube 5 is not more than 2mm, the deviation refers to the deviation of verticality and cannot be more than 2mm at maximum;
Pile pressing for the first time: adopting a mechanical vibrating hammer with the model of by-vh400 as a pile driver, pressing the miniature steel pipe 5 into a pile, and pressing the miniature steel pipe 5 into the stirring pile for 72m;
second perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out second perpendicularity calibration on the miniature steel tube 5;
and (5) pile pressing for the second time: the miniature steel tube 5 is pressed into the stirring pile 74m;
Third perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out third perpendicularity calibration on the miniature steel tube 5;
thirdly, pile pressing: when the miniature steel tube 5 is pressed to be 1m away from the top, the reinforcing plate 6 and the calibration pile casing are removed, the miniature steel tube 5 is pressed into the stirring pile 75.75m, and at the moment, the central hole 51 of the miniature steel tube 5 is level with the concrete mortar of the stirring pile 7;
(6) Pile driver shift
The pile machine shifts, the channel steel is pressed on the upper end of the miniature steel pipe 5, the channel steel is fixed on the groove 8 of the stirring pile 7, the miniature steel pipe 5 is prevented from floating upwards, the channel steel is removed after the concrete mortar is solidified, and the construction of the miniature steel pipe stirring pile is completed;
(7) Light precipitation
And (3) properly dewatering the light dewatering wells around the stirring pile 7 while carrying out the step (5) and the step (6), so as to prevent the micro steel pipes 5 from floating up due to the abundant groundwater.
The stirring pile construction method achieves the following good technical effects:
1. The steel pipe stirring pile is used for stirring cement paste and weak sea mud to form a reinforcing body, meanwhile, the bearing capacity strength is high, the accuracy of quasi-perpendicularity is more than or equal to 1.2mm and less than or equal to 2.0mm, the positioning allowance deviation of the steel pipe is 2mm, and the problems of pile deflection, floating, sedimentation and the like are prevented; the horizontal resistance is increased, the horizontal displacement does not occur, and the anti-overturning and impact capabilities are enhanced.
2. The steel pipe is directly implanted under the condition that cement paste is not coagulated, the stirring pile and the steel pipe are easy to form a combined body, construction procedures such as drilling, hammering, secondary grouting and the like are simplified, pile length is easy to adjust, construction is simple and convenient, and reliability is high.
3. The soil body is not disturbed and extruded in the construction process, the influence on surrounding adjacent buildings (structures) is small, sewage and mud are less, and the environment-friendly and energy-saving effect of civilized construction can be achieved.
4. The pile forming quality meets the requirement, the construction is simple and convenient, the secondary grouting is not needed, and the cost is saved.
Meanwhile, the construction method is also suitable for construction sites with narrow construction sites, adjacent sites such as buildings and pipelines, and the like, can realize advanced support during foundation pit excavation, restrict surrounding soil deformation, and bear soil pressure in advance, so that a large free face can not be formed.
The above-mentioned 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 all kinds of modifications, substitutions or alterations made to the above-mentioned structures of the present invention according to the above-mentioned general knowledge and conventional means of the art without departing from the basic technical ideas of the present invention shall fall within the scope of the present invention.
Claims (9)
1. The method for constructing the miniature steel pipe mixing pile in the soft sea Liu Jiaohu-phase sediment silt layer by adopting the calibration pile casing comprises a barrel, steel hoops, supporting legs and calibration bolts, wherein the barrel is a steel pipe with two ends being vertically arranged, the steel hoops circumferentially encircle the upper end of the barrel and are welded with the barrel, the supporting legs are three, 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 barrel wall of the barrel along the circumferential direction at the same height, the bolt holes are positioned below the steel hoops, the three calibration bolts are respectively and correspondingly arranged in the three bolt holes along the radial direction of the barrel, projection lines of the center lines of the three supporting legs on the horizontal plane are uniformly distributed in an alternating mode with those of the adjacent two projection lines, and the included angle between the adjacent two projection lines is 60 DEG, and the method is characterized in that: the construction method comprises the following steps:
(1) Manufacturing miniature steel tube and calibration casing
Selecting a miniature steel pipe, arranging a central hole at the top of the miniature steel pipe, wherein the distance between the center of the central hole and the upper edge of the miniature steel pipe is 25cm, respectively installing a reinforcing plate on the pipe walls positioned at two sides of the central hole, arranging a hanging hole at the 5mm position of the outer edge of the reinforcing plate, and using the reinforcing plate as a lifting lug of a miniature steel pipe verticality calibration hanging hammer and a follow-up pile pressing and fixing; manufacturing a calibration protection cylinder while manufacturing a miniature steel pipe;
(2) Irrigation stirring pile and fixed calibration casing
Selecting a stirring pile, wherein the stirring pile is provided with a groove, the stirring pile is filled with concrete mortar, after the grouting of the stirring pile reaches the full of the mortar, the central line of the stirring pile is measured,
Then, determining the central line of the calibration protection cylinder by using a cross line and a plumb bob, placing and fixing the calibration protection cylinder so that the central line of the calibration protection cylinder coincides with the central line of the stirring pile, enabling 1/4 cylinder of the calibration protection cylinder to extend into the stirring pile, and anchoring three supporting feet on the edges of the stirring pile groove by using ground bolts;
(3) Calibration point for guiding and placing
A vertical calibration point is led to the upper edge of the calibration casing by a level gauge, and a calibration point mark is made;
(4) Pile foundation in-place hanging miniature steel pipe
When the concrete mortar is not coagulated, a crane is used for hoisting the miniature steel pipe and placing the miniature steel pipe into the calibration pile casing, so that the lower end of the miniature steel pipe is just contacted with the concrete mortar of the stirring pile;
(5) Three-time calibration verticality and three-time pile pressing of miniature steel pipe
First perpendicularity calibration: 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 casing are positioned on the same vertical line, so that the verticality of the miniature steel pipe meets the requirement, and the miniature steel pipe is ensured to be positioned at the center of the stirring pile; then three calibration bolts on the adjustment calibration pile casing for the front end of calibration bolt contradicts the outer wall of miniature steel pipe, adjusts the straightness that hangs down of miniature steel pipe through precession calibration bolt, and once adjust, the precession adjustment volume of calibration bolt is 1.2mm, and the adjustment result is to satisfy: the adjustment precision of the miniature steel tube is 1.2mm or more and Q or less than 2.0mm or less, and the positioning deviation of the miniature steel tube is 2mm or less;
pile pressing for the first time: pile pressing is carried out on the miniature steel pipes by adopting a pile machine, and the miniature steel pipes are pressed into the stirring pile for 2m;
Second perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out second perpendicularity calibration on the miniature steel tube;
And (5) pile pressing for the second time: the miniature steel tube is pressed into the stirring pile for 4m;
Third perpendicularity calibration: repeating the first perpendicularity calibration method, and carrying out third perpendicularity calibration on the miniature steel tube;
Thirdly, pile pressing: when the miniature steel pipe pile is pressed to be 1m away from the ground, the reinforcing plate and the calibration pile casing are removed, the miniature steel pipe is pressed into the stirring pile for 5.75m, and at the moment, the central hole of the miniature steel pipe is flush with the concrete mortar of the stirring pile;
(6) Pile driver shift
And (3) shifting the pile machine, pressing channel steel at the upper end of the miniature steel pipe, fixing the channel steel on a groove of the stirring pile, preventing the miniature steel pipe from floating upwards, and dismantling the channel steel after the concrete mortar is solidified, so that the construction of the miniature steel pipe stirring pile is completed.
2. The construction method according to claim 1, wherein: the dimension D1 xd1 xH 1 of the cylinder is 168mm x 4mm x 80cm, wherein D1 is the outer diameter of the cylinder, D1 is the wall thickness of the cylinder, and H1 is the length of the cylinder.
3. The construction method according to claim 1, wherein: the steel hoop is flat steel with the dimensions of 48mm in width and 4mm in thickness; the distance between the upper edge of the steel hoop and the upper edge of the cylinder body is 5cm.
4. The construction method according to claim 1, wherein: an inclined included angle alpha is formed between the supporting leg and the vertical surface, and the inclined included angle alpha is more than or equal to 45 degrees and less than or equal to 60 degrees.
5. The construction method according to claim 1, wherein: the bolt hole is a phi 16mm hole, the distance between the center point of the bolt hole and the upper edge of the cylinder body is 20cm, and the calibration bolt is a phi 16mm bolt.
6. The construction method according to claim 1, wherein: the method further comprises light precipitation, wherein the light precipitation wells around the stirring pile are subjected to precipitation at the same time of the step (5) and the step (6), so that the condition that the miniature steel pipes float upwards due to abundant groundwater is prevented.
7. The construction method according to claim 1, wherein: the diameter of the central hole is 10mm; the diameter of the hanging hole is 5mm.
8. The construction method according to claim 1, wherein: the thickness of the reinforcing plate is 1cm, and the length of the reinforcing plate is 6cm.
9. The construction method according to claim 1, wherein: the dimension D2D 2 XH 2 of the miniature steel pipe is 168mm x 4mm x 80cm, wherein D2 is the outer diameter of the miniature steel pipe, D2 is the wall thickness of the miniature steel pipe, and H2 is the length of the miniature steel pipe; the diameter of the stirring pile is phi 800mm, and the width of the groove of the stirring pile is 1.2m.
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