CN114875903A - Pile tip rotary spraying grouting and synchronous stirring integrated construction device and method - Google Patents
Pile tip rotary spraying grouting and synchronous stirring integrated construction device and method Download PDFInfo
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- CN114875903A CN114875903A CN202210523334.1A CN202210523334A CN114875903A CN 114875903 A CN114875903 A CN 114875903A CN 202210523334 A CN202210523334 A CN 202210523334A CN 114875903 A CN114875903 A CN 114875903A
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
Abstract
The invention discloses a pile tip rotary jet grouting and synchronous stirring integrated construction device and method. The bottom of the pile tip is provided with a conical positioning device of the pile tip, and the top of the conical positioning device can enable the tool rest to pass through in a contraction state. The pile pressing process drives the grouting rod mechanism to rotate through the rotary power device, the diameter of the tool rest is controlled through the hydraulic device, accurate positioning is achieved through the pile tip conical positioning device, high-pressure cement slurry is sprayed to the pile tip through the grouting nozzle and is synchronously stirred to form cement soil with uniform quality, the purpose of improving soil around the pile is achieved, and the purpose of uniformly improving soil around the pile is achieved.
Description
Technical Field
The invention relates to a device and a method for quickly grouting and reinforcing the periphery of a precast pile, in particular to a device and a method for integrated construction of pile tip rotary grouting and synchronous stirring.
Background
The precast tubular pile has the characteristics of convenience, high construction speed, high pile body strength, low manufacturing cost and the like, and is widely applied to foundation treatment engineering in soft areas. However, when the soft soil layer is thick and the bearing capacity of the tubular pile is insufficient, the bearing capacity of the tubular pile needs to be improved by improving the soil around the pile and at the pile tip. Accidents such as pipe pile breakage easily occur when a hard interlayer is encountered in the pipe pile construction process, so that the prefabricated pipe pile construction is difficult. Since the precast tubular pile has the above problems, the use of the tubular pile is limited.
At present, the reinforcement construction method of the soil body around the precast tubular pile has the following two measures:
the first measure is to adopt a drilling machine to pre-drill holes, then cement soil is injected into the drilled holes to be stirred to form cement soil, and finally the precast tubular pile is inserted into the cement soil.
The second measure is to reserve grouting pipes and grouting holes in the process of processing the precast tubular pile, and to perform grouting reinforcement on the periphery of the tubular pile through the reserved grouting holes on the pipe wall after the pile pressing is completed. This construction method mainly has the following drawbacks.
a) The grouting pipe and the grouting hole are reserved in the precast tubular pile processing process, and the integrity of the tubular pile is damaged. Because the pipe wall of the pipe pile is thin, the reserved grouting pipe is difficult to construct, and because the grouting pipe and the grouting hole are reserved in the pipe pile, the pile body is easy to generate stress concentration and damage in the pile pressing process.
b) Grouting holes reserved in the tubular pile are dispersed, the diffusion distances of slurries at different depths are different, the slurries and the soil body cannot be fully mixed, and the reinforcing effect is not ideal.
c) The reinforcement of the circumferential length of the tubular pile is an rugged reinforcement mode, the grouting reinforcement is not needed for the hard stratum in the composite stratum of the upper soft stratum and the lower hard stratum, and the grouting material waste is caused by the reinforcement of the circumferential length.
Disclosure of Invention
Aiming at the technical problems, the invention provides a pile tip rotary spraying grouting and synchronous stirring integrated construction device and method, the reinforcement of cement soil around the prefabricated pipe pile and the pile pressing are simultaneously carried out, the reinforcement strength of cement soil around the pile and at the pile tip is uniform, and the reinforcement effect is good; the reinforcement range of the soil around the pile is controllable; the rotary tool rest can crush the hard interlayer, so that pile breakage accidents in the hard interlayer area are avoided; therefore, the reinforcing strength of the soil around the precast tubular pile is reliable.
In order to achieve the technical purpose, the invention adopts the following technical means:
the utility model provides a stake point spouts slip casting and synchronous stirring integration construction equipment soon, includes:
a slurry storage tank to provide cement slurry;
slip casting pole mechanism for realize the jet grouting soon, slip casting pipe mechanism includes:
the upper end of the inner pipe is connected with a grouting pipeline, and the lower end of the inner pipe is provided with a grouting nozzle;
the rotary power device is arranged at the pile top of the precast tubular pile and is used for driving the inner pipe to rotate;
the outer pipe is coaxially sleeved outside the inner pipe, and a grouting nozzle at the bottom of the inner pipe extends out of the bottom end of the outer pipe;
the reducing tool rest comprises an upper annular connecting piece, a lower annular connecting piece and two tool rests which are connected between the two annular connecting pieces and are respectively arranged on the left side and the right side of the annular connecting piece, wherein the upper annular connecting piece is connected with the bottom end of the outer pipe in a rotating and sealing manner, and the lower annular connecting piece is arranged in parallel under the upper annular connecting piece and is fixedly connected with the inner pipe; the two tool rests have the same structure and respectively comprise two strip-shaped tool rest units which are hinged with each other, the upper ends of the tool rests are hinged with the upper annular connecting piece, and the lower ends of the tool rests are hinged with the lower annular connecting piece;
the inner pipe and the outer pipe can move up and down relatively to realize diameter changing of the tool rest; the diameter of the reducing tool rest is smaller than the inner diameter of the tubular pile after the reducing tool rest is contracted, the diameter of the reducing tool rest is not smaller than 2D after the reducing tool rest is extended, and D is the outer diameter of the tubular pile;
the grouting pressure control valve is arranged in the grouting pipeline and used for controlling the grouting pressure in the pile pressing process;
the pile tip conical positioning device is arranged at the pile tip and used for positioning the grouting rod mechanism, reducing the pile end resistance in the pile pressing process and uniformly extruding the uniformly stirred cement soil to the periphery of the pile; the conical positioning device is provided with a through hole for the reducing tool rest to pass through in a contraction state;
and the pile pressing hydraulic device is used for driving the pipe pile to a preset depth through static pressure.
The outer wall of the inner pipe is fixedly connected with a piston, the piston divides an annular cavity between the inner pipe and the outer pipe into an upper hydraulic cavity and a lower hydraulic cavity,
and the reducing hydraulic pipeline is used for introducing hydraulic oil into the upper hydraulic cavity or the lower hydraulic cavity to drive the inner pipe and the outer pipe to move up and down relatively.
A linear bearing is arranged between the inner pipe and the outer pipe;
and the vertical driving unit is in driving connection with the outer pipe and is used for the upper and lower relative motion between the inner pipe and the outer pipe.
And the pile tip conical positioning device is provided with a vertical rib plate.
The strip-shaped tool rest unit comprises a tool strip and a tool bit.
The invention further discloses a construction method based on the pile tip rotary spraying grouting and synchronous stirring integrated construction device, which comprises the following steps:
s1, pressing the pile according to the preset position, wherein the pile pressing adopts static pressure construction; in the pile pressing process, the pile tip conical positioning device is used for reducing the pile tip resistance in the pile pressing process and positioning the position of a grouting rod mechanism, so that a pipe pile tip drill rod is prevented from generating large horizontal shaking, and the soil around the prefabricated pipe pile is reinforced and does not reach the designed position;
s2, performing jet grouting and synchronous stirring, wherein the inner pipe and the outer pipe move up and down relatively to realize diameter changing of the tool rest; opening a grouting pressure valve, stirring while performing rotary grouting to ensure that cement slurry is fully mixed with a soil body;
aiming at the phenomenon of pile breakage caused by overlarge pile end resistance of a hard interlayer in the stratum during the pile pressing process, the hard interlayer is cut by rotating the reducing cutter rest, so that the pile tip resistance is reduced, and the pile pressing process is smoothly carried out;
performing rotary spraying grouting at a preset position according to the reinforcement design requirement to improve the surrounding soil body, or adjusting the diameter of a tool rest to realize variable cross-section reinforcement;
and S3, after the jet grouting and synchronous stirring are finished, the inner pipe and the outer pipe move up and down relatively to realize the shrinkage of the tool rest, so that the inner rod is taken out of the prefabricated pipe pile.
The step S2 rotary spraying grouting process specifically comprises the following steps:
s21, aiming at grouting of bearing capacity of the riser piles around the reinforced pile, determining the reinforcing range and type of the tubular pile according to the thickness and distribution position of the reinforced soft soil layer, wherein the concrete steps are as follows:
the first reinforcement condition: grouting reinforcement is carried out in a vertical range within 10 times of the pile diameter from the ground according to the horizontal bearing capacity lifting working condition of the tubular pile;
the second reinforcement condition is as follows: aiming at the horizontal bearing capacity lifting working condition of the tubular pile, adopting the whole length reinforcement of a pile body and grouting reinforcement of a pile end;
the third reinforcement condition: aiming at the earthquake resistance improving working condition of the soft soil stratum, a pile body is adopted for layered reinforcement;
a fourth reinforcement regime: and (4) grouting and reinforcing the soft soil stratum aiming at the composite stratum with the upper soft part and the lower hard part.
The grouting amount in the pile pressing process is obtained by the following formula:
G c the grouting amount of the cement paste is selected,
a p taking a as the pile end grouting coefficient p 1.3 to 1.5, d is the diameter of the tubular pile,
a s taking a as the empirical coefficient of the pile side bearing capacity s Is in the range of 0.5 to 0.7,
d' the reinforced diameter of the cement soil,
L 1 and (5) reinforcing the depth of the cement soil.
The pile side grouting pressure in the soft soil area is 1.5-2.0 MPa.
Has the advantages that:
compared with the prior art, the invention has the beneficial effects that:
firstly, the grouting rod mechanism is used for performing rotary spraying grouting on the pile tip of the precast tubular pile and synchronously stirring through the reducing tool rest, the pile driving construction and the pile tip grouting stirring are performed simultaneously, a grouting pipeline does not need to be pre-buried in the precast tubular pile manufacturing process or the outer wall of the precast tubular pile is not perforated, and the integrity and the strength of the tubular pile are prevented from being reduced.
And secondly, the pile tip conical positioning device is used for reinforcing the periphery of the precast tubular pile and the pile tip soil while reducing the resistance of the pile tip.
And thirdly, the soil body around the pile can be fully improved through the rotary spraying grouting reinforcement, compared with a point type grouting process of a grouting pipe, the reinforcing effect of the rotary spraying grouting and synchronous stirring integration is better, the strength of cement soil around the pile can be more uniform, the horizontal and vertical bearing capacity of the precast tubular pile is further improved, the sedimentation of a pile foundation is reduced, and the safety of a building is improved.
Drawings
FIG. 1 is a schematic diagram of horizontal bearing capacity of a precast tubular pile on a pile side for grouting reinforcement of a lifting pile side;
FIG. 2 is a schematic view of a hydraulic circuit and a power swivel;
FIG. 3 is a top view of FIG. 2
FIG. 4 is a schematic drawing showing the shrinkage of the reducing tool holder;
FIG. 5 is a schematic view of the extension of the reducing tool holder
FIG. 6 is a schematic view of the application of the apparatus of the present invention;
FIG. 7 is a schematic view of the inner tube and the inner structure of the inner tube;
in the figure: 1 is a slurry storage tank; 2 is a grouting pipeline; 3 is a grouting pressure control valve; 4 is a power rotating device; 5 is a pile pressing hydraulic pipeline; 6 is a grouting rod mechanism; 7, prefabricating a tubular pile; 8 is a pile tip conical positioning device; 9 is a reducing tool rest; 10 is a grouting nozzle; 11 is a hydraulic pile pressing device; 12 is a tool rest; 13 is an inner tube; 14 is an outer tube; 15 is a piston; and 16 is a reducing hydraulic pipeline.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the drawings and specific examples so that those skilled in the art can fully understand the technical solutions of the present invention.
Example 1
As shown in fig. 1, a pile tip rotary grouting and synchronous stirring integrated construction device includes:
a slurry storage tank to provide cement slurry;
the rotary power device is arranged at the pile top of the precast tubular pile;
reducing knife rest 9 sets up the outer tube is terminal, and seals the annular gap bottom between outer tube and the inner tube, is equipped with hydraulic oil in the annular gap of outer tube and inner tube, under the effect of hydraulic oil, can realize upper and lower relative motion between outer tube and the inner tube, in order to drive reducing knife rest 9 realizes the reducing for intensive mixing thick liquid mixes with the soil body and the hard intermediate layer of broken stake point reduces the pile pressing resistance.
The reducing tool holder 9 includes: the outer pipe comprises an upper annular connecting piece and a lower annular connecting piece which are coaxial and arranged in parallel up and down, wherein the upper annular connecting piece is fixedly connected with the bottom end of the outer pipe, and the lower annular connecting piece is fixedly connected with the inner pipe;
the two tool rests are respectively a first tool rest connected to one side between the two annular connecting pieces and a second tool rest connected to the other side between the two annular connecting pieces, the two tool rests are identical in structure and respectively comprise two strip-shaped tool rest units which are hinged to each other, the upper ends of the tool rests are hinged to the upper annular connecting piece, and the lower ends of the tool rests are hinged to the lower annular connecting piece;
the outer wall of the inner pipe is fixedly connected with a piston, the piston divides an annular cavity between the inner pipe and the outer pipe into an upper hydraulic cavity and a lower hydraulic cavity,
the hydraulic pipeline is used for introducing hydraulic oil into the upper hydraulic cavity or the lower hydraulic cavity and driving the inner pipe and the outer pipe to move up and down relatively so as to realize diameter changing of the tool rest;
the hydraulic pipeline is used for introducing hydraulic oil into the annular gap between the inner pipe and the outer pipe to drive the inner pipe and the outer pipe to move up and down relatively so as to realize diameter changing of the tool rest;
the diameter of the reducing tool rest 9 after tool rest contraction is smaller than the inner diameter of the tubular pile, the diameter of the tool rest after expansion is not smaller than 2D, and D is the outer diameter of the tubular pile;
the grouting pressure control valve is arranged in the grouting pipeline and used for controlling the grouting pressure in the pile pressing process;
the conical positioning device of the pile tip reduces the resistance of the pile tip in the pile pressing process, uniformly extrudes the uniformly stirred cement soil to the periphery of the pile, and is arranged at the pile tip, and the conical positioning device is provided with a through hole for the reducing cutter rest 9 to pass through in a contraction state;
the pile pressing hydraulic device is used for driving the tubular pile to a preset depth through static pressure;
example 2
The difference between this embodiment and embodiment 1 is that the manner of achieving the up and down movement between the inner tube and the outer tube is different, specifically:
a linear bearing is arranged between the inner pipe and the outer pipe;
and the vertical driving unit is in driving connection with the outer pipe and is used for the upper and lower relative motion between the inner pipe and the outer pipe.
As a further preferable feature of the technical solutions of the embodiment 1 and the embodiment 2 of the present invention, the pile tip conical positioning device 8 is provided with a vertical rib.
The invention discloses an integrated construction method for bearing capacity of a prefabricated lifting prefabricated tubular pile, which adopts the integrated construction device for pile tip rotary spraying grouting and synchronous stirring, and comprises the following steps:
1) stake point toper positioner welds in precast tubular pile stake point, reduces the stake end resistance and the location slip casting pole mechanism position that the pile pressing process is in, prevents that tubular pile stake point drilling rod from producing great level and rocking, leads to the tubular pile not to reach the design position.
2) The rotary power device is connected with the hydraulic device and the grouting rod mechanism, and the rotary power device is fixed at the pile end of the precast tubular pile.
3) And (5) pile pressing is carried out according to the preset position. In order to ensure the grouting reinforcement effect, static pressure construction is adopted in the pile pressing process.
4) The upper part of the grouting rod mechanism is connected with a power rotating device and a hydraulic device, and the lower part of the drill rod is connected with a telescopic rotary tool rest.
5) And (3) extending the telescopic rotary tool rest in the pile pressing process, simultaneously opening the grouting pressure valve, stirring while performing rotary grouting, and fully mixing the cement slurry with the soil body.
The grouting process comprises the following steps:
a. the first step. Aiming at grouting of bearing capacity of a riser pile around a reinforced pile, determining a tubular pile reinforcement design scheme according to the thickness of a reinforced soft soil layer and the strength of a soil body (internal friction angle, cohesive force and water content);
b. and a second step. The grouting amount in the pile pressing process can be determined according to a formula
And (6) performing calculation. In the formula G c For the amount of grout injected, a p Taking a as the pile end grouting coefficient s 1.3 to 1.5, d is the diameter of the tubular pile, a s Taking a as the empirical coefficient of the pile side bearing capacity s Is 0.5 to 0.7, D' 2 For consolidating cement soil by diameter, L 1 Reinforcing the depth of the cement soil;
c. and thirdly, performing the step of. Determining the grouting pressure, wherein the grouting pressure at the pile side in the soft soil area is 1.5-2.0 MPa;
d. and fourthly, performing the step of. And pile tip rotary spraying grouting and synchronous stirring can be performed in the pile pressing process.
6) After jet grouting and synchronous stirring are finished, the diameter of the tool rest is contracted through a hydraulic device, and therefore the grouting rod mechanism is taken out of the prefabricated pipe pile.
Compared with the prior art, the invention has the advantages that:
the reinforcement of soil around the tubular pile and the pile pressing are carried out synchronously, and the construction efficiency is high.
And secondly, the pile tip rotary spraying grouting and synchronous stirring pile peripheral soil are improved uniformly, and the reinforcing effect is good.
And thirdly, the hard interlayer in the soft soil stratum can be broken through the pile tip rotating tool rest, and the resistance of the pile tip is reduced.
And fourthly, layered reinforcement and variable cross-section reinforcement can be realized.
Fifthly, the integrity of the tubular pile is not affected, grouting holes do not need to be reserved in the tubular pile, and the operation is simple.
The invention is suitable for the following working conditions:
working condition for improving vertical bearing capacity of pipe pile
The vertical bearing capacity of the lifting pipe pile can be used for grouting reinforcement of the pile periphery and the pile tip, and the reinforcement diameter of the pile periphery is 1.5-2D. The pile tip grouting pressure is 2.0-5.0 MPa, and the pile side grouting pressure is 1.5-3.0 MPa. The synchronous grouting process of the precast tubular pile is terminated after any one of the following conditions is met: a) the grouting pressure reaches a design value, and the grouting amount reaches the design value; b) and (3) the total grouting amount of the pile bottom and the pile side reaches 75% of the target amount, the grouting pressure reaches 1.5 times of the upper limit of the required grouting pressure, and the grouting pressure is maintained for 2-3 min.
Working condition of reinforcing and lifting horizontal bearing capacity around tubular pile
The horizontal bearing capacity around the pile of the tubular pile is improved only by grouting and reinforcing within a certain depth range of the earth surface, the reinforcing depth is not less than 5m, the reinforcing radius is 1.5-2D (diameter of the tubular pile), and grouting parameters are the same as working conditions.
③ the soft soil stratum has a hard interlayer
Aiming at the phenomenon that the pile end of a hard interlayer in the stratum is possibly broken due to overlarge resistance in the pile pressing process, the hard interlayer is cut by rotating the tool rest, so that the pile tip resistance is reduced, and the pile pressing process is smoothly carried out.
Fourthly, the fixed layer reinforcement and the variable cross section reinforcement can be realized according to the soil layer condition and the reinforcement design requirement
The method can improve the surrounding soil body by rotary spraying grouting at a preset position according to the reinforcement design requirement, and can realize variable cross-section reinforcement by adjusting the diameter of a tool rest, wherein the grouting parameters are the same as those of the working condition I.
Claims (9)
1. The utility model provides a stake point spouts slip casting and synchronous stirring integration construction equipment soon, includes:
a slurry storage tank to provide cement slurry;
slip casting pole mechanism for realize spouting the slip casting soon, its characterized in that, slip casting pipe mechanism includes:
the upper end of the inner pipe is connected with a grouting pipeline, and the lower end of the inner pipe is provided with a grouting nozzle (10);
the rotary power device (4) is arranged at the pile top of the precast tubular pile and is used for driving the inner pipe to rotate;
the outer pipe is coaxially sleeved outside the inner pipe, and a grouting nozzle at the bottom of the inner pipe extends out of the bottom end of the outer pipe;
the reducing tool rest (9) comprises an upper annular connecting piece, a lower annular connecting piece and two tool rests which are connected between the two annular connecting pieces and are respectively arranged on the left side and the right side of the annular connecting piece, wherein the upper annular connecting piece is connected with the bottom end of the outer pipe in a rotating and sealing manner, and the lower annular connecting piece is arranged in parallel under the upper annular connecting piece and is fixedly connected with the inner pipe; the two tool rests have the same structure and respectively comprise two strip-shaped tool rest units which are hinged with each other, the upper ends of the tool rests are hinged with the upper annular connecting piece, and the lower ends of the tool rests are hinged with the lower annular connecting piece;
the inner pipe and the outer pipe can move up and down relatively to realize diameter changing of the tool rest; the diameter of the reducing tool rest (9) is smaller than the inner diameter of the tubular pile after the tool rest is contracted, the diameter of the tool rest is not smaller than 2D after the tool rest is expanded, and D is the outer diameter of the tubular pile;
the grouting pressure control valve is arranged in the grouting pipeline and used for controlling the grouting pressure in the pile pressing process;
the pile tip conical positioning device is arranged at the pile tip and used for positioning the grouting rod mechanism, reducing the pile end resistance in the pile pressing process and uniformly extruding the uniformly stirred cement soil to the periphery of the pile; the conical positioning device is provided with a through hole for the reducing tool rest (9) to pass through in a contraction state;
and a pile pressing hydraulic device (11) for driving the pipe pile to a preset depth through static pressure.
2. The pile toe rotary grouting and synchronous stirring integrated construction device according to claim 1, wherein a piston is fixedly connected to the outer wall of the inner pipe, the piston divides an annular cavity between the inner pipe and the outer pipe into an upper hydraulic cavity and a lower hydraulic cavity,
and the reducing hydraulic pipeline is used for introducing hydraulic oil into the upper hydraulic cavity or the lower hydraulic cavity to drive the inner pipe and the outer pipe to move up and down relatively.
3. The pile toe jet grouting and synchronous stirring integrated construction device according to claim 1, wherein a linear bearing is arranged between the inner pipe and the outer pipe;
and the vertical driving unit is in driving connection with the outer pipe and is used for the upper and lower relative motion between the inner pipe and the outer pipe.
4. The integrated construction device of pile tip rotary grouting and synchronous stirring as claimed in claim 1, wherein a vertical rib plate is arranged on the conical pile tip positioning device (8).
5. The integrated construction device for pile toe jet grouting and synchronous stirring of claim 1, wherein the strip-shaped tool rest unit comprises a tool strip and a tool bit.
6. A construction method based on the pile tip rotary grouting and synchronous stirring integrated construction device as claimed in any one of claims 1 to 5 is characterized in that: the method comprises the following steps:
s1, pile pressing is carried out according to the preset position, and static pressure construction is adopted for pile pressing; in the pile pressing process, the pile tip conical positioning device is used for reducing the pile tip resistance in the pile pressing process and positioning the position of a grouting rod mechanism, so that a pipe pile tip drill rod is prevented from generating large horizontal shaking, and the soil around the prefabricated pipe pile is reinforced and does not reach the designed position;
s2, performing jet grouting and synchronous stirring, wherein the inner pipe and the outer pipe move up and down relatively to realize diameter changing of the tool rest; opening a grouting pressure valve, stirring while performing rotary grouting to ensure that cement slurry is fully mixed with a soil body;
aiming at the phenomenon of pile breakage caused by overlarge pile end resistance of a hard interlayer in the stratum during the pile pressing process, the hard interlayer is cut by rotating the reducing cutter rest, so that the pile tip resistance is reduced, and the pile pressing process is smoothly carried out;
performing rotary spraying grouting at a preset position according to the reinforcement design requirement to improve the surrounding soil body, or adjusting the diameter of a tool rest to realize variable cross-section reinforcement;
and S3, after the jet grouting and synchronous stirring are finished, the inner pipe and the outer pipe move up and down relatively to realize the shrinkage of the tool rest, so that the inner rod is taken out of the prefabricated pipe pile.
7. The construction method of the pile toe jet grouting and synchronous stirring integrated construction device according to claim 6, characterized in that: the step S2 rotary spraying grouting process specifically comprises the following steps:
s21, aiming at grouting of bearing capacity of the riser piles around the reinforced pile, determining the reinforcing range and type of the tubular pile according to the thickness and distribution position of the reinforced soft soil layer, wherein the concrete steps are as follows:
the first reinforcement condition: grouting reinforcement is carried out in a vertical range within 10 times of the pile diameter from the ground according to the horizontal bearing capacity lifting working condition of the tubular pile;
the second reinforcement condition is as follows: aiming at the horizontal bearing capacity lifting working condition of the tubular pile, adopting the whole length reinforcement of a pile body and grouting reinforcement of a pile end;
the third reinforcement condition: aiming at the earthquake resistance improving working condition of the soft soil stratum, a pile body is adopted for layered reinforcement;
a fourth reinforcement regime: and (4) grouting and reinforcing the soft soil stratum aiming at the composite stratum with the upper soft part and the lower hard part.
8. The construction method of the pile toe jet grouting and synchronous stirring integrated construction device according to claim 6, characterized in that:
the grouting amount in the pile pressing process is obtained by the following formula:
G c the grouting amount of the cement paste is selected,
a p taking a as the pile end grouting coefficient p 1.3 to 1.5, d is the diameter of the tubular pile,
a s taking a as the empirical coefficient of the pile side bearing capacity s Is in the range of 0.5 to 0.7,
d' the reinforced diameter of the cement soil,
L 1 and (5) reinforcing the depth of the cement soil.
9. The construction method of the pile toe jet grouting and synchronous stirring integrated construction device according to claim 6, characterized in that: the pile side grouting pressure in the soft soil area is 1.5-2.0 MPa.
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| CN106087999A (en) * | 2016-03-19 | 2016-11-09 | 王继忠 | A kind of stir constructing device and the construction method thereof spraying expanding reinforcing pile |
| CN111622217A (en) * | 2020-05-08 | 2020-09-04 | 浙江大学 | Grouting precast tubular pile after rotary spraying construction and construction process thereof |
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2022
- 2022-05-13 CN CN202210523334.1A patent/CN114875903B/en active Active
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| CN101182716A (en) * | 2007-12-05 | 2008-05-21 | 中北大学 | Pile sinking method of Synchronization grouting static pressure precast pile |
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|---|---|
| CN114875903B (en) | 2023-08-22 |
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