CN113481978A - High-pressure jet grouting pile construction method based on PVC (polyvinyl chloride) perforated pipes - Google Patents
High-pressure jet grouting pile construction method based on PVC (polyvinyl chloride) perforated pipes Download PDFInfo
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- CN113481978A CN113481978A CN202110838922.XA CN202110838922A CN113481978A CN 113481978 A CN113481978 A CN 113481978A CN 202110838922 A CN202110838922 A CN 202110838922A CN 113481978 A CN113481978 A CN 113481978A
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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
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0038—Production methods using an auger, i.e. continuous flight type
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a high-pressure jet grouting pile construction method based on a PVC (polyvinyl chloride) perforated pipe, which comprises the following steps of: the method comprises the following steps: carrying out geological exploration on the geology needing to be constructed; step two: manufacturing a PVC (polyvinyl chloride) floral tube; step three: drilling a hole on the ground to be constructed through a geological drilling machine, immediately pulling out a drill rod of the geological drilling machine after drilling to the designed depth, and inserting a PVC (polyvinyl chloride) perforated pipe with the diameter matched with the aperture into the hole; step four: preparing cement slurry; step five: and (3) inserting a high-pressure rotary jet pile drill bit of the high-pressure rotary jet pile machine into the inner bottom of the hole, carrying out high-pressure rotary jet grouting on the high-pressure rotary jet pile drill bit from bottom to top in the hole, and cutting the PVC perforated pipe in the hole by cement slurry sprayed by the high-pressure rotary jet pile machine in the high-pressure rotary jet grouting process. The invention can improve the construction efficiency and quality of the high-pressure jet grouting pile.
Description
Technical Field
The invention relates to the technical field of high-pressure jet grouting piles, in particular to a high-pressure jet grouting pile construction method based on a PVC (polyvinyl chloride) perforated pipe.
Background
The high-pressure rotary jet pile is characterized by that it utilizes high-pressure rotating nozzle to spray cement slurry into soil layer and mix it with soil body to form continuous lapped cement reinforced body.
The traditional high-pressure jet grouting pile construction process has the advantages that the pile forming quality is poor easily in a deep and dense sand layer, the requirement condition of a water stopping effect and a foundation pit supporting requirement is not met, high-pressure jet grouting pile construction is carried out in the stratum at the same time, and collapse of gravels around drilled holes is easily caused when the high-pressure jet grouting pile drills and promotes jet grouting, so that the problems that hole collapse is caused, buried drilling is carried out, or a drill rod cannot naturally drill down to the designed pile length in the dense sand layer and the like are caused.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a high-pressure jet grouting pile construction method based on a PVC perforated pipe, and in order to solve the technical problems, the invention adopts the following technical scheme to realize:
a construction method of a high-pressure jet grouting pile based on a PVC (polyvinyl chloride) perforated pipe comprises the following steps:
the method comprises the following steps: carrying out geological exploration on the geology needing to be constructed;
step two: manufacturing a PVC (polyvinyl chloride) floral tube;
step three: drilling a hole on the ground to be constructed through a geological drilling machine, immediately pulling out a drill rod of the geological drilling machine after drilling to the designed depth, and inserting a PVC (polyvinyl chloride) perforated pipe with the diameter matched with the aperture into the hole;
step four: preparing cement slurry;
step five: and (3) inserting a high-pressure rotary jet pile drill bit of the high-pressure rotary jet pile machine into the inner bottom of the hole, carrying out high-pressure rotary jet grouting on the high-pressure rotary jet pile drill bit from bottom to top in the hole, and cutting the PVC perforated pipe in the hole by cement slurry sprayed by the high-pressure rotary jet pile machine in the high-pressure rotary jet grouting process.
Advantageously, in the second step, the raw materials of the PVC floral tube comprise polyvinyl chloride and calcium carbonate, and the manufactured PVC floral tube is subjected to a hole opening treatment.
Advantageously, the ratio of said polyvinyl chloride to said calcium carbonate is 1: 4.
Beneficially, the holes on the PVC perforated pipe are arranged in a plum blossom shape, the hole diameter spacing is 5mm, and the hole diameter is less than 2.5 mm.
Advantageously, in the third step, a drill rod matched with the PVC perforated pipe in diameter is selected and installed on the geological drilling machine, the ground to be constructed is drilled, and the drill rod is pulled out after the drilling is finished, so that the drilling is finished.
Advantageously, in the fourth step, the cement slurry adopts 42.5 ordinary portland cement, the mud-water ratio of the cement slurry is 1.0, and the stirring time of the cement slurry is not less than 30 seconds;
the cement slurry is alternately stirred by two mortar mixers, and meshes are arranged in the mortar mixers and at outlets of the mortar mixers.
Beneficially, in the step five, the control parameters of the jet grouting drill bit on the high-pressure jet grouting pile machine are as follows:
air pressure is 0.7MPa, slurry pressure is 2.5-3.5MPa, water pressure is 28MPa, lifting speed is 9-11cm/min, rotating speed is 9.5-10.5r/min, and slurry flow is 95-105L/min.
The invention has the following beneficial effects:
1. geological drilling machine drills and can guarantee to pierce through closely knit sand bed of depth and boulder, guarantees boring into smoothly of drilling rod, guarantees to spout the construction stake of stake soon long, is convenient for insert comparatively hard sand bed with the PVC floral tube in, solves because of boulder high pressure spout stake self drilling can't pierce through the problem of this layer boulder soon to having solved and having adopted to strike the pore-forming, after the outer tube vibration strikes the pore-forming that follows up the dado, inserted the slow problem of PVC floral tube construction progress.
2. The PVC sleeve is inserted to solve the problems of nozzle blockage, drill pipe burying and the like caused by hole collapse of the rotary jet grouting pile of the sand layer, and the pile forming quality of the rotary jet grouting pile is ensured.
3. The PVC flower sleeve adopts an ultrathin wall structure, and the toughness of the PVC flower sleeve is effectively reduced by adding calcium carbonate and polyvinyl chloride, so that the effect of cutting the PVC flower sleeve when cement slurry is sprayed is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the illustrated orientations or positional relationships, which are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected through the insides of 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.
A construction method of a high-pressure jet grouting pile based on a PVC (polyvinyl chloride) perforated pipe comprises the following steps:
the method comprises the following steps: carrying out geological exploration on the geology needing to be constructed;
step two: manufacturing a PVC (polyvinyl chloride) floral tube;
step three: drilling a hole on the ground to be constructed through a geological drilling machine, immediately pulling out a drill rod of the geological drilling machine after drilling to the designed depth, and inserting a PVC (polyvinyl chloride) perforated pipe with the diameter matched with the aperture into the hole;
geological drilling machine drills and can guarantee to pierce through closely knit sand bed of depth and boulder, guarantees boring into smoothly of drilling rod, guarantees to spout the construction stake of stake soon long, is convenient for insert comparatively hard sand bed with the PVC floral tube in, solves because of boulder high pressure spout stake self drilling can't pierce through the problem of this layer boulder soon to having solved and having adopted to strike the pore-forming, after the outer tube vibration strikes the pore-forming that follows up the dado, inserted the slow problem of PVC floral tube construction progress.
Step four: preparing cement slurry;
step five: and (3) inserting a high-pressure rotary jet pile drill bit of the high-pressure rotary jet pile machine into the inner bottom of the hole, carrying out high-pressure rotary jet grouting on the high-pressure rotary jet pile drill bit from bottom to top in the hole, and cutting the PVC perforated pipe in the hole by cement slurry sprayed by the high-pressure rotary jet pile machine in the high-pressure rotary jet grouting process.
The high-pressure jet grouting pile drill bit can jet the cement slurry to the gaps in the gravel layer conveniently, and the waterproof effect is achieved.
In an optional embodiment of the present invention, in the second step, the raw materials of the PVC floral tube include polyvinyl chloride and calcium carbonate, and the manufactured PVC floral tube is subjected to a hole opening treatment.
According to an alternative embodiment of the invention, the ratio of the polyvinyl chloride to the calcium carbonate is 1:4, so that the toughness of the PVC perforated pipe can be effectively reduced, and the PVC perforated pipe can be cut more easily by cement slurry sprayed by a high-pressure jet grouting pile drill.
According to an optional embodiment of the invention, the holes on the PVC perforated pipe are arranged in a plum blossom shape, the hole pitch is 5mm, and the hole diameter is less than 2.5 mm.
According to an optional implementation manner of the invention, in the third step, a drill rod matched with the PVC perforated pipe in diameter is selected and installed on the geological drilling machine, the ground to be constructed is drilled, and after the drilling is finished, the drill rod is pulled out to finish the drilling. The drill rod can be 110mm diameter.
In an alternative embodiment of the invention, in the fourth step, the cement slurry is 42.5 ordinary portland cement, the cement slurry has a cement-to-water ratio of 1.0, and the cement slurry is stirred for no less than 30 seconds;
the cement slurry is alternately stirred by the two mortar mixers, meshes are arranged in the mortar mixers and at outlets of the mortar mixers, and hard blocks in the cement slurry are filtered out by the meshes to prevent the nozzles and the nozzles from being blocked.
The cement slurry is fresh and has no caking, the screen allowance passing through a 0.08mm square hole sieve is less than or equal to 5 percent, the cement entering the field must have the product qualification certificate of manufacturers every batch, and the cement mixing amount of the high-pressure jet grouting pile is 40 percent according to the related specification by spot check; and stirring the slurry according to the designed proportion, measuring the specific gravity of the slurry at any time in the slurry preparation process, and counting the material dosage of each hole after the high-pressure spray grouting of each hole is finished. Stirring the slurry by a mortar stirrer, wherein the slurry must be continuously and uniformly stirred, the stirring time is not less than 30 seconds, and the one-time stirring use time is also controlled within 4 hours; the cement slurry has a slurry-water ratio of 1.0, so that the water stopping effect can be still achieved after the slurry is diluted by pore water in pebbles in the rotary spraying process.
According to an optional implementation manner of the present invention, in the step five, the control parameters of the jet grouting drill bit on the high-pressure jet grouting pile machine are as follows:
air pressure is 0.7MPa, slurry pressure is 2.5-3.5MPa, water pressure is 28MPa, lifting speed is 9-11cm/min, rotating speed is 9.5-10.5r/min, and slurry flow is 95-105L/min.
The well controlled injection pressure, air pressure and grouting pressure are the key for ensuring the pile forming quality of the jet grouting pile, the sand layer is compact, the pebble particle size is large, the water content is rich, and the pressure of high-pressure water and air is required to be ensured so as to ensure the cutting and slurry returning effects and ensure that the designed pile diameter is formed by cutting.
When the rotary spraying is promoted, the slurry return condition of the orifice is concerned at any moment, and when the phenomenon that the slurry return of the orifice becomes thin is found, the promotion speed is slowed down, and measures such as repeated stirring up and down are carried out for multiple times so as to ensure the construction quality;
according to an optional embodiment of the invention, in the fifth step, when the high-pressure jet grouting pile drill is used for spraying cement slurry, the whole hole is continuously performed from bottom to top, if the spraying pipe on the high-pressure jet grouting pile drill is disassembled halfway, the re-spraying is performed, the overlapping length of the re-spraying is not less than 200mm, and under the condition that the slurry supply is normal, the slurry inlet density is increased when the slurry return density of the orifice is reduced and the design requirement cannot be met, so that the water stop effect can be still achieved after the cement slurry is diluted by pore water in pebbles in the jet grouting process.
According to an optional implementation mode of the invention, the deviation requirement of the in-place and design position of the geological drilling machine is less than 2cm, the deviation degree of verticality is less than 1%, and construction can be carried out after the precision requirement is met by adopting the method of measuring with a steel ruler and hanging a hammer ball for detection.
The cement slurry is transported in a sealed and unblocked delivery pipe, the delivery pipe is fixedly connected with a rotary jet drill bit, the slurry density is measured periodically, and the uniform and stable slurry bleeding is ensured.
The first embodiment is as follows:
in the first step, a geological drilling rig is used for geological survey, and when the stratum is judged to be cohesive soil according to a geological survey result, a rotary spraying drill rod can be directly used for naturally drilling down to perform high-pressure rotary spraying.
Example two:
in the first step, a geological survey is carried out by adopting a geological drilling rig, and when the stratum is judged to be a compact sand layer or a local boulder exists according to a geological survey result, construction needs to be carried out by the high-pressure jet grouting pile construction method;
specific survey result data are as follows:
plain filling: brown ash, brown yellow and the like, mainly comprises cohesive soil and silt, is unevenly mixed with 10 to 20 percent of construction waste such as coarse gravel, broken stone, concrete blocks and the like and a small amount of domestic waste, is newly piled, has a loose structure, and does not finish self-weight consolidation of the structure.
Mucky soil: grey black, organic matter contained, fishy smell, saturated, flowing and plastic state, no shake reaction, smooth gloss reaction, and high dry strength and toughness.
Powdery clay: the coating is gray yellow, is in a plastic state, contains a small amount of coarse sand, has no shaking reaction, smooth gloss reaction and high dry strength and toughness.
Fine sand is gray white and gray yellow, the main component of the fine sand contains quartzite and a small amount of cohesive soil. Is in a saturated, slightly dense state and a local loose state, has better sorting property and poorer gradation
Coarse sand: offwhite and lime yellow, the main component is quartz, contains a small amount of cohesive soil, is in a saturated, slightly-dense-medium-dense state, and has better sorting property and poorer gradation.
Completely weathered granite: the rock core is a hard earth pillar, is easy to soften and disintegrate in water and is extremely soft rock, and the basic quality grade of the rock body is V pole.
Strongly weathered granite: brown gray and brown yellow, most minerals are obviously weathered, the core is half-rock half-soil-shaped, the part is blocky, the rock mass can be broken or crushed by hands, the alloy drilling tool can drill into the rock mass which is extremely soft rock, and the basic quality grade of the rock mass is V pole.
And (3) apoplexy-treated granite: offwhite and brownish yellow, medium-sized grain granite structure, part of minerals are degenerated and in a block structure, part of minerals are weathered, a rock core is in a block shape and a short column shape, knocking is performed dumb, an alloy drilling tool is difficult to drill, the rock body is harder and harder, and the basic grade of the rock body is IV grade.
In this example, the groundwater in the field is mainly pore diving and bedrock fracture water existing in the fourth series soil. The pore diving is mainly supplied by atmospheric precipitation and lateral runoff, the water level changes according to different climates and seasons, the underground water level rises in the rich water season, and the fourth series of strata are mostly in a water-saturated state. The gully and the alluvial plain groundwater mainly exists in pore water in fine ores and coarse sand of the alluvial layer, and belongs to diving property. Bedrock fracture water is present in weathered zones of the underlying bedrock in the field, and strong weathering is the main water storage layer section. The distribution of the bed rock fracture water is greatly influenced by the development degree of the cracks of the existing rock mass, has obvious anisotropic specificity, and is rich in occurrence of the fracture water and strong in water permeability in joint crack relatively-developing sections.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A high-pressure jet grouting pile construction method based on PVC floral tubes is characterized by comprising the following steps:
the method comprises the following steps: carrying out geological exploration on the geology needing to be constructed;
step two: manufacturing a PVC (polyvinyl chloride) floral tube;
step three: drilling a hole on the ground to be constructed through a geological drilling machine, immediately pulling out a drill rod of the geological drilling machine after drilling to the designed depth, and inserting a PVC (polyvinyl chloride) perforated pipe with the diameter matched with the aperture into the hole;
step four: preparing cement slurry;
step five: and (3) inserting a high-pressure rotary jet pile drill bit of the high-pressure rotary jet pile machine into the inner bottom of the hole, carrying out high-pressure rotary jet grouting on the high-pressure rotary jet pile drill bit from bottom to top in the hole, and cutting the PVC perforated pipe in the hole by cement slurry sprayed by the high-pressure rotary jet pile machine in the high-pressure rotary jet grouting process.
2. The method for constructing the high-pressure jet grouting pile based on the PVC floral tube as claimed in claim 1, wherein in the second step, the raw material of the PVC floral tube comprises polyvinyl chloride and calcium carbonate, and the prepared PVC floral tube is perforated.
3. The method for constructing the high-pressure jet grouting pile based on the PVC perforated pipe as claimed in claim 2, wherein the ratio of the polyvinyl chloride to the calcium carbonate is 1: 4.
4. The PVC perforated pipe-based high-pressure jet grouting pile construction method as claimed in claim 2, wherein the holes on the PVC perforated pipe are arranged in a plum blossom shape, the hole diameter spacing is 5mm, and the hole diameter is less than 2.5 mm.
5. The PVC perforated pipe-based high-pressure jet grouting pile construction method as claimed in claim 2, wherein in the third step, a drill rod matched with the PVC perforated pipe in diameter is selected and installed on the geological drilling machine, the ground to be constructed is drilled, and after the drilling is completed, the drill rod is pulled out to complete the drilling.
6. The construction method of the high-pressure jet grouting pile based on the PVC perforated pipe as claimed in claim 5, wherein in the fourth step, the cement slurry is 42.5 ordinary portland cement, the cement slurry has a mud-water ratio of 1.0, and the stirring time of the cement slurry is not less than 30 seconds;
the cement slurry is alternately stirred by two mortar mixers, and meshes are arranged in the mortar mixers and at outlets of the mortar mixers.
7. The PVC perforated pipe-based high-pressure jet grouting pile construction method as claimed in claim 6, wherein in the fifth step, the control parameters of a jet grouting drill bit on the high-pressure jet grouting pile machine are as follows:
air pressure is 0.7MPa, slurry pressure is 2.5-3.5MPa, water pressure is 28MPa, lifting speed is 9-11cm/min, rotating speed is 9.5-10.5r/min, and slurry flow is 95-105L/min.
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| CN202110838922.XA CN113481978A (en) | 2021-07-23 | 2021-07-23 | High-pressure jet grouting pile construction method based on PVC (polyvinyl chloride) perforated pipes |
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| CN202110838922.XA CN113481978A (en) | 2021-07-23 | 2021-07-23 | High-pressure jet grouting pile construction method based on PVC (polyvinyl chloride) perforated pipes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198739A (en) * | 2022-08-17 | 2022-10-18 | 建基集团地下空间河湖整治研发中心有限公司 | Construction method of high-pressure jet grouting pile and high-pressure jet grouting parameter monitoring system device used in construction method |
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| CN110409434A (en) * | 2019-06-25 | 2019-11-05 | 浙江省建工集团有限责任公司 | A kind of the high-pressure rotary jet grouting pile technique and its drill bit of combination pvc pipe |
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| CN115198739A (en) * | 2022-08-17 | 2022-10-18 | 建基集团地下空间河湖整治研发中心有限公司 | Construction method of high-pressure jet grouting pile and high-pressure jet grouting parameter monitoring system device used in construction method |
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