CN113279395A - High-grouting-slurry-body built-in prestressed concrete pile construction process - Google Patents
High-grouting-slurry-body built-in prestressed concrete pile construction process Download PDFInfo
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- CN113279395A CN113279395A CN202110656297.7A CN202110656297A CN113279395A CN 113279395 A CN113279395 A CN 113279395A CN 202110656297 A CN202110656297 A CN 202110656297A CN 113279395 A CN113279395 A CN 113279395A
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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
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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
- 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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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a high-grouting-body built-in prestressed concrete pile construction process, and relates to the technical field of building construction. The process comprises the following steps: selecting a construction site, measuring and lofting the pile position, and marking to obtain a marked pile position; adopting a high-pressure jet grouting pile to sink, cut and stir downwards in a marked pile position according to a first preset depth and preset soil layer conditions, and jetting cement slurry at high pressure to form cement slurry; and pressing the prestressed concrete pile into the preset elevation of the marked pile position by adopting a static pressure or hammering prestressed concrete pile. The construction process of the high-grouting-body built-in prestressed concrete pile can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process promotion, so that the bearing capacity of the pile plays a more obvious role. The method has the advantages of reducing the construction cost, meeting the dust control standard, shortening the construction period and having reliable quality.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a high-grouting-body built-in prestressed concrete pile construction process.
Background
Along with the adjustment of national industrial policies, the development of pile foundation engineering construction technology adapting to new situation is urgently needed, the prestressed concrete pile plays a remarkable role in the field of engineering construction, the high-strength large-diameter prestressed concrete pile is produced at the same time, and the improvement of the construction technology process is an effective construction method for further improving the bearing capacity of the prestressed concrete pile.
In the prior art, a common pile driver is adopted for directly carrying out pile driving operation on concrete piles, and the concrete pile construction is realized through subsequent processes of hammering pile sinking, pile splicing and the like after pile driving is finished.
The inventor finds in research that the prior art has at least the following disadvantages:
the reinforcing effect on the outer side resistance and the pile end resistance of the pile is not obvious, and the bearing capacity is not good.
Disclosure of Invention
The invention aims to provide a construction process of a high-grouting-body built-in prestressed concrete pile, which solves the defects of the prior art, can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process improvement, and enables the bearing capacity of the pile to play a more obvious role.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a high-grouting-body built-in prestressed concrete pile construction process, which comprises the following steps:
selecting a construction site, measuring and lofting the pile position, and marking to obtain a marked pile position;
adopting a high-pressure jet grouting pile to sink, cut and stir downwards in a marked pile position according to a first preset depth and preset soil layer conditions, and jetting cement slurry at high pressure to form cement slurry;
and pressing the prestressed concrete pile into the preset elevation of the marked pile position by adopting a static pressure or hammering prestressed concrete pile.
The construction process of the high-grouting-body built-in prestressed concrete pile can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process promotion, so that the bearing capacity of the pile plays a more obvious role. Meanwhile, the construction process has wide adaptability, is particularly suitable for areas with thicker fine sand layers and medium sand layers, can loosen compact sand layers, and can improve the pile side resistance after cement paste is solidified. The method has the advantages of reducing the construction cost, meeting the dust control standard, shortening the construction period and having reliable quality. Wherein, high-pressure and high-speed jet flow with high kinetic energy is applied to impact and break soil body to make grooves, and slurry is mixed with soil body particles which are punched. The jet pressure is up to 3-6Mpa, which has great energy for impacting broken soil.
In some embodiments of the present invention, the step of using the high-pressure jet grouting pile to sink, cut and stir the marked pile position according to the preset depth and the preset soil layer condition, and jetting the cement slurry at high pressure to form the cement slurry further comprises:
a drilling machine is in place, and drilling holes in the marked pile positions by the drilling machine to obtain formed holes;
the lower injection pipe is used for checking the injection pipe after the drill is checked, measuring the length of the injection pipe, adjusting injection pressure and pipeline pressure, and performing pilot injection on the injection pipe;
preparing slurry, namely preparing cement slurry of the high-pressure jet grouting pile;
and (4) injecting the slurry, namely injecting the cement slurry continuously from top to bottom to form cement slurry.
In some embodiments of the invention, the drilling of the drilling machine is performed by a high-pressure jet grouting pile machine synchronously with grouting.
In some embodiments of the present invention, the pilot injection process includes adjusting an injection direction and a swing angle.
The test spraying process can detect the state of the spraying pipe, ensure that the spraying pipe can normally operate along each spraying direction and swing angle, and improve the forming efficiency and the forming quality of cement paste.
In some embodiments of the present invention, the jet grouting process is followed by a slurry bleeding process.
In some embodiments of the present invention, after the step of selecting a construction site, the method further includes:
and cleaning the field, draining accumulated water, and completely excavating and removing sludge, tree roots, turf and humus on the original ground in the field.
The field energy is cleaned, so that subsequent construction is facilitated, and the influence of external impurities on the construction process is reduced.
In some embodiments of the invention, the step of measuring lofting and marking comprises:
and (4) measuring and releasing a construction axis according to a construction drawing and a coordinate network shop, determining hole positions on the construction axis, coding pile numbers, empty numbers and serial numbers, and measuring the ground elevation of each hole opening according to the datum points.
In some embodiments of the present invention, the method of hammering the prestressed concrete pile includes the following steps:
lifting and tapping a hammer, and keeping the prestressed concrete pile to be always vertical to a working plane under the checking of a plurality of total stations;
and formally hammering, adjusting the hammering falling distance, and sinking the pile according to the falling distance after the prestressed concrete pile is embedded into the soil to reach a second preset depth.
The hammering comprises two types of hammering by a hydraulic hammer or static pile pressing, the hydraulic hammer reasonably selects the hammer weight and the impact energy according to the bearing capacity, the principle is that the low impact of the heavy hammer is better than the high impact of the light hammer, and the pile cap is easy to be broken by the high impact of the light hammer. The driving-in type pile forming mainly controls the pile length and the final three-matrix penetration degree or double controls of the pile length and the final three-matrix penetration degree. The weight of the press pile selected for the static press pile is about 2.2-2.5 times of the characteristic value, the static press pile is visual, and the bearing force after pile forming is guaranteed. The static pile press has heavy machinery, large occupied area and requirements on field size and surface foundation bearing capacity. The static pressure pile of two pile-forming methods is expensive, and the mechanical entering and withdrawing cost is a little expensive. The bead triangles differ by approximately 10 Yuan/m. The construction process has some requirements on pile matching and pile splicing: for example, a pile is matched, a pile is not required to be connected to the bottom, a joint is required to be arranged in the depth and not to be arranged on the surface, the welding requirement of the pile connection is high, a professional welding worker certificate needs to be provided, a welding line needs to be uniform and full, fish scale-shaped lines are arranged on a welding surface, the construction can be continued after the welding is cooled for a certain time, the welding line is prevented from being damaged by cold brittleness after the welding line is buried into soil and quenched, the service life is not affected, the anti-floating design requirement is met, the requirement on the welding line is high, and the quality is controlled better.
In some embodiments of the invention, the prestressed concrete pile is a UHC-600(110) -12-105 pipe pile.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the construction process of the high-grouting-body built-in prestressed concrete pile can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process promotion, so that the bearing capacity of the pile plays a more obvious role. Meanwhile, the construction process has wide adaptability, is particularly suitable for areas with thicker fine sand layers and medium sand layers, can loosen compact sand layers, and can improve the pile side resistance after cement paste is solidified. The method has the advantages of reducing the construction cost, meeting the dust control standard, shortening the construction period and having reliable quality. Wherein, high-pressure and high-speed jet flow with high kinetic energy is applied to impact and break soil body to make grooves, and slurry is mixed with soil body particles which are punched. The jet pressure is up to 30-60Mpa, which has great energy for impacting broken soil.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a high-injected grout internal prestressed concrete pile construction process provided in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "inside", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is only for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, the present invention cannot be understood as being limited. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
Referring to fig. 1, the present embodiment provides a high grouting slurry internal prestressed concrete pile construction process, which includes the following steps:
the embodiment of the application provides a high-grouting-body built-in prestressed concrete pile construction process, which comprises the following steps:
s100, preparing before construction, selecting a construction site, measuring and lofting pile positions and marking to obtain marked pile positions;
s200, injecting high-pressure jet grouting slurry, adopting a high-pressure jet grouting pile to sink, cut and stir downwards in a marked pile position according to a first preset depth and preset soil layer conditions, and jetting cement slurry at high pressure to form cement slurry;
and S300, hammering the pile, and pressing the prestressed concrete pile into the preset elevation of the marked pile position by adopting a static pressure or prestressed concrete pile hammering mode.
The construction process of the high-grouting-body built-in prestressed concrete pile can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process promotion, so that the bearing capacity of the pile plays a more obvious role. Meanwhile, the construction process has wide adaptability, is particularly suitable for areas with thicker fine sand layers and medium sand layers, can loosen compact sand layers, and can improve the pile side resistance after cement paste is solidified. The method has the advantages of reducing the construction cost, meeting the dust control standard, shortening the construction period and having reliable quality. Wherein, high-pressure and high-speed jet flow with high kinetic energy is applied to impact and break soil body to make grooves, and slurry is mixed with soil body particles which are punched. The jet pressure is up to 3-6Mpa, which has great energy for impacting broken soil.
In an implementation manner of this embodiment, the high-pressure jet grouting pile is adopted to perform sinking, cutting and stirring in the marked pile position according to a preset depth and a preset soil layer condition, and high-pressure jet cement slurry, and the step of forming cement slurry further includes:
the drilling machine is in place, the jet pipe is arranged, after the drill hole is checked and accepted, the jet pipe is checked, the length of the jet pipe is measured, the jet pressure and the pipeline pressure are adjusted, and the jet pipe is tested and jetted;
preparing slurry, namely preparing cement slurry of the high-pressure jet grouting pile;
and (4) injecting the slurry, namely injecting the cement slurry continuously from top to bottom to form cement slurry.
Meanwhile, the pilot spraying process comprises the step of adjusting the grouting pressure in the spraying direction.
Specifically, the test spraying process can detect the state of the spraying pipe, so that the spraying pipe can normally operate along each spraying direction and swinging angle, and the forming efficiency and the forming quality of cement paste are improved.
And the grouting treatment is also included after the injection grouting process.
In this embodiment, after the step of selecting a construction site, the method further includes:
cleaning the field, removing accumulated water, and completely excavating silt, tree roots, turf and humus on the original ground in the field.
It is worth explaining that the site cleaning can facilitate subsequent construction and reduce the influence of external impurities on the construction process.
In this embodiment, the step of measuring loft and making a mark comprises:
and (4) measuring and releasing a construction axis according to a construction drawing and a coordinate network shop, determining hole positions on the construction axis, coding pile numbers, empty numbers and serial numbers, and measuring the ground elevation of each hole opening according to the datum points.
In an embodiment of this embodiment, the method of hammering the prestressed concrete pile includes the following steps:
the hammer is lifted and tapped, and the prestressed concrete pile is kept to be always vertical to the working plane under the checking of a plurality of theodolites;
and formally hammering, adjusting the hammering falling distance, and sinking the pile according to the falling distance after the prestressed concrete pile is embedded into the soil to reach a second preset depth.
It is worth to be noted that hammering includes striking with a diesel hammer or static pile pressing, and the diesel hammer reasonably selects the hammer weight and the impact energy according to the bearing capacity, and the principle is that the low striking with the heavy hammer is better than the high striking with the light hammer, and the pile cap is easy to be broken by the high striking with the light hammer. The driving-in type pile forming mainly controls the pile length and the final three-matrix penetration degree or double controls of the pile length and the final three-matrix penetration degree. The weight of the press pile selected for the static press pile is about 2.2-2.5 times of the characteristic value, the static press pile is visual, and the bearing force after pile forming is guaranteed. The static pile press has heavy machinery, large occupied area and requirements on field size and surface foundation bearing capacity. The static pressure pile of two pile-forming methods is expensive, and the mechanical entering and withdrawing cost is a little expensive. The bead triangles differ by approximately 10 Yuan/m. The construction process has some requirements on pile matching and pile splicing: for example, a pile is matched, a pile is not required to be connected to the bottom, a joint is required to be arranged in the depth and not to be arranged on the surface, the welding requirement of the pile connection is high, a professional welding worker certificate needs to be provided, a welding line needs to be uniform and full, fish scale-shaped lines are arranged on a welding surface, the construction can be continued after the welding is cooled for a certain time, the welding line is prevented from being damaged by cold brittleness after the welding line is buried into soil and quenched, the service life is not affected, the anti-floating design requirement is met, the requirement on the welding line is high, and the quality is controlled better.
Optionally, before the static pressure or hammering the prestressed concrete pile, the method further comprises: preparing a protective pile cap, and excavating foreign objects around the pile.
The prestressed concrete pile is a UHC-600(110) -12-105 tubular pile. After the UHC-600(110) -12-105 tubular piles are treated, the diameter of a cement mixing pile is 0.9M, the compression-resistant bearing capacity characteristic value of a single pile can reach 3000KN, after construction on site, a detection test is carried out, and the test result shows that when the limit load reaches 6000KN, the maximum sedimentation amount is less than 8 mm. The bearing capacity of the pile is proved to have a larger potential.
In summary, the embodiment of the invention provides a high-grouting-body built-in prestressed concrete pile construction process. The high-grouting-body built-in prestressed concrete pile construction process comprises the following steps of: selecting a construction site, measuring and lofting the pile position, and marking to obtain a marked pile position; adopting a high-pressure jet grouting pile to sink, cut and stir downwards in a marked pile position according to a first preset depth and preset soil layer conditions, and jetting cement slurry at high pressure to form cement slurry; and pressing the prestressed concrete pile into the preset elevation of the marked pile position by adopting a static pressure or hammering prestressed concrete pile. The construction process of the high-grouting-body built-in prestressed concrete pile can reinforce the outer side resistance and the pile end resistance of the pile by utilizing the characteristic of high strength of the prestressed concrete pile and through process promotion, so that the bearing capacity of the pile plays a more obvious role. Meanwhile, the construction process has wide adaptability, is particularly suitable for areas with thicker fine sand layers and medium sand layers, can loosen compact sand layers, and can improve the pile side resistance after cement paste is solidified. The method has the advantages of reducing the construction cost, meeting the dust control standard, shortening the construction period and having reliable quality. Wherein, high-pressure and high-speed jet flow with high kinetic energy is applied to impact and break soil body to make grooves, and slurry is mixed with soil body particles which are punched. The jet pressure is up to 30-60Mpa, which has great energy for impacting broken soil.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-grouting-body built-in prestressed concrete pile construction process is characterized by comprising the following steps of:
selecting a construction site, measuring and lofting the pile position, and marking to obtain a marked pile position;
adopting a high-pressure jet grouting pile to sink, cut and stir downwards in a marked pile position according to a first preset depth and preset soil layer conditions, and jetting cement slurry at high pressure to form cement slurry;
and pressing the prestressed concrete pile into the preset elevation of the marked pile position by adopting a static pressure or hammering prestressed concrete pile.
2. The high-pressure jet grouting internally-prestressed concrete pile construction process according to claim 1, wherein the step of forming the cement paste by sinking, cutting and stirring the high-pressure jet grouting pile downwards in the marked pile position according to the preset depth and the preset soil layer condition and jetting the cement paste at high pressure further comprises:
a drilling machine is put in place, the drilling machine is used for drilling holes in the marked pile positions,form aDrilling;
a lower slurry injection pipe which operates synchronously with the high-pressure drilling machine, simultaneously inspects the injection pipe, measures the length of the injection pipe, adjusts the injection pressure and the pipeline pressure, and performs slurry injection;
preparing slurry, namely preparing cement slurry of the high-pressure jet grouting pile;
and (4) injecting the slurry, namely injecting the cement slurry continuously from top to bottom to form cement slurry.
3. The high-guniting slurry built-in prestressed concrete pile construction process according to claim 2, wherein the high-rotation stirring pile machinery is adopted for drilling holes by the drilling machine.
4. The high-injection-slurry internally-prestressed concrete pile construction process according to claim 2, further comprising pilot injection treatment, wherein the pilot injection process comprises adjusting an injection direction and a swing angle.
5. The high-grouting internally prestressed concrete pile construction process according to claim 2, wherein the grouting step is followed by grouting treatment.
6. The high-injected slurry built-in prestressed concrete pile construction process according to claim 1, further comprising, after the step of selecting a construction site:
and cleaning the field, draining accumulated water, and completely excavating and removing sludge, tree roots, turf and humus on the original ground in the field.
7. The high injected slurry built-in prestressed concrete pile construction process according to claim 6, wherein said step of measuring lofting and marking comprises:
and (4) measuring and releasing a construction axis according to a construction drawing and a coordinate network shop, determining hole positions on the construction axis, coding pile numbers and serial numbers, and measuring the ground elevation of each hole opening according to the datum points.
8. The high-grouting-rate internally prestressed concrete pile construction process according to claim 1, wherein a manner of hammering the prestressed concrete pile comprises the steps of:
lifting and tapping a hammer, and keeping the prestressed concrete pile to be always vertical to a working plane under the checking of a plurality of total stations;
and formally hammering, adjusting the hammering falling distance, and sinking the pile according to the falling distance after the prestressed concrete pile is embedded into the soil to reach a second preset depth.
9. The high-grouting-rate internally prestressed concrete pile construction process according to claim 8, wherein before hammering the prestressed concrete pile, the method further comprises:
and preparing a protective pile cap to prevent the top of the pile from being broken when the pile is hammered.
10. The high injected grout built-in prestressed concrete pile construction process according to any one of claims 1 to 9, wherein the prestressed concrete pile is a UHC-600(110) -12-105 pipe pile.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110656297.7A CN113279395A (en) | 2021-06-11 | 2021-06-11 | High-grouting-slurry-body built-in prestressed concrete pile construction process |
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| CN202110656297.7A CN113279395A (en) | 2021-06-11 | 2021-06-11 | High-grouting-slurry-body built-in prestressed concrete pile construction process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT286883B (en) * | 1965-11-04 | 1970-12-28 | Mueller Ludwig | In-situ concrete pile |
| CN106223331A (en) * | 2016-09-06 | 2016-12-14 | 王继忠 | A kind of creep into injection vibrate stirring construction equipment and the construction method of foundation |
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
| CN107299633A (en) * | 2017-07-06 | 2017-10-27 | 江苏现代永昌建设有限公司 | A kind of utilization High-pressure Spiral Spray Technology improves the construction method of the bearing capacity of stake |
-
2021
- 2021-06-11 CN CN202110656297.7A patent/CN113279395A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT286883B (en) * | 1965-11-04 | 1970-12-28 | Mueller Ludwig | In-situ concrete pile |
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
| CN106223331A (en) * | 2016-09-06 | 2016-12-14 | 王继忠 | A kind of creep into injection vibrate stirring construction equipment and the construction method of foundation |
| CN107299633A (en) * | 2017-07-06 | 2017-10-27 | 江苏现代永昌建设有限公司 | A kind of utilization High-pressure Spiral Spray Technology improves the construction method of the bearing capacity of stake |
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