CN111270671A - High-pressure jet grouting pile construction process - Google Patents

High-pressure jet grouting pile construction process Download PDF

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Publication number
CN111270671A
CN111270671A CN202010066903.5A CN202010066903A CN111270671A CN 111270671 A CN111270671 A CN 111270671A CN 202010066903 A CN202010066903 A CN 202010066903A CN 111270671 A CN111270671 A CN 111270671A
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CN
China
Prior art keywords
parts
cement mortar
jet grouting
pressure jet
pile
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Pending
Application number
CN202010066903.5A
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Chinese (zh)
Inventor
徐炳进
李东锋
李继伟
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Guangzhou City Polytechnic
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Guangzhou City Polytechnic
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Priority to CN202010066903.5A priority Critical patent/CN111270671A/en
Publication of CN111270671A publication Critical patent/CN111270671A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00146Sprayable or pumpable mixtures
    • C04B2111/00155Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention relates to the technical field of jet grouting pile construction, in particular to a high-pressure jet grouting pile construction process, which comprises the following steps of: s1, drilling towards the ground to form a pile hole; s2, sealing the opening part of the pile hole; s3, injecting gas with the temperature of more than 100 ℃, keeping the constant pressure in the pile hole at 0.3-0.5MPa, and preserving the heat for 5-10 min; s4, deblocking the opening of the pile hole, and spraying cement mortar into the pile hole in a rotating mode through a mud protective wall to form a high-pressure rotating spraying pile; the cement mortar comprises the following components in parts by weight: 100 parts of Portland cement; 10-12 parts of silicon carbide; 5-8 parts of talcum powder; 15-20 parts of clay; 90-110 parts of water. The invention has the effects that cement mortar is easier to permeate in soil, and the action range of a single high-pressure jet grouting pile for reinforcing the foundation is wider.

Description

High-pressure jet grouting pile construction process
Technical Field
The invention relates to the technical field of construction of jet grouting piles, in particular to a high-pressure jet grouting pile construction process.
Background
At present, when the foundation of soil such as silt, mucky soil, plastic flow, soft plastic or plastic cohesive soil, silt, sandy soil, loess, plain filling soil, gravel soil and the like is treated, high-pressure rotary jet grouting piles are often adopted for foundation reinforcement.
The existing high-pressure jet grouting pile sprays cement paste into a soil layer through a rotating nozzle by high pressure, so that the cement paste is mixed with the soil body to form a continuous lapped cement reinforcing body.
Because the high pressure jet grouting pile needs to spout the grout into the soil layer for the structural stability of the soil that is suitable for the high pressure jet grouting pile is generally poor, otherwise grout can't spout and just can't form the high pressure jet grouting pile in the soil layer, however at the in-process of jet grouting because the cutting of grout will destroy the pore wall of stake hole, and begin to destroy from stake hole bottom, easily because the structural stability of soil is not high and lead to the condition that the hole collapses or the pore wall part collapses, and then lead to the proportion that grout and soil mix to distribute very unevenly on the direction of height of high pressure jet grouting pile, thereby lead to the condition that the intensity descends in high pressure jet grouting pile part appears, consequently need adopt the mud dado in actual operation generally with the stability in protection stake hole.
The above prior art solutions have the following drawbacks: but resistance to cement paste is formed after the mud protects the wall, so that the cement paste is more difficult to spray into a soil layer, the volume of the combination of the cement paste and the soil is reduced, the action range of a single high-pressure rotary spraying pile for reinforcing the foundation is smaller, and the improvement space is provided.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-pressure jet grouting pile construction process which has the effect of wider action range of reinforcing a foundation by a single high-pressure jet grouting pile.
The above object of the present invention is achieved by the following technical solutions:
a high-pressure jet grouting pile construction process comprises the following steps:
s1, drilling towards the ground to form a pile hole;
s2, sealing the opening part of the pile hole;
s3, injecting gas with the temperature of more than 100 ℃, keeping the constant pressure in the pile hole at 0.3-0.5MPa, and preserving the heat for 5-10 min;
s4, deblocking the opening of the pile hole, and spraying cement mortar into the pile hole in a rotating mode through a mud protective wall to form a high-pressure rotating spraying pile;
the cement mortar comprises the following components in parts by weight:
100 parts of Portland cement;
10-12 parts of silicon carbide;
5-8 parts of talcum powder;
15-20 parts of clay;
90-110 parts of water.
By adopting the technical scheme, the soil on the wall of the pile hole is heated by sealing the pile hole and injecting gas with the temperature of more than 100 ℃ towards the pile hole, so that water is evaporated, the wall of the pile hole is dried, and meanwhile, the high-temperature gas has a wider penetration range in the soil by matching with the constant pressure of 0.3-0.5MPa of the gas in the pile hole, so that a microporous structure in the soil is communicated, cement mortar is more easily penetrated in the soil after penetrating through wall protection slurry, the penetration range of the cement mortar is expanded, and the action range of reinforcing the foundation by using a single high-pressure rotary jet grouting pile is larger;
by adding the silicon carbide into the cement mortar, the cutting effect of the cement mortar is better when the cement mortar is used for cutting a soil layer, the cement mortar is easier to spray into the soil layer, and meanwhile, the strength of the cured cement mortar is higher, so that the quality of a high-pressure rotary spraying pile is better;
the talcum powder is added into the cement mortar, so that the cement mortar is more lubricated and has better fluidity, and the cement mortar is easier to permeate in a soil layer after puncturing the wall protection slurry, so that the permeation range of the cement mortar is increased, and the action range of a single high-pressure rotary jet grouting pile for reinforcing the foundation is wider;
through adding clay in cement mortar for cement mortar also has better viscidity, and cement mortar also has certain dado function, makes the difficult collapse of stake hole.
The present invention in a preferred example may be further configured to: in the step S3, nitrogen gas at 110-120 ℃ is injected.
By adopting the technical scheme, the serious caking of the soil caused by overhigh temperature is avoided by injecting the nitrogen gas at the temperature of 110-120 ℃, and meanwhile, enough temperature is ensured to ensure that the moisture is quickly evaporated;
through letting in nitrogen gas to reduce the content of oxygen in the soil, make soil nevertheless be difficult for appearing the phenomenon of burning owing to the oxygen deficiency even high temperature, reduce the possibility that the danger takes place, make the construction comparatively safe.
The present invention in a preferred example may be further configured to: in the step S4, the grouting pressure is 20-25 MPa.
By adopting the technical scheme, the grouting pressure is controlled to be 20-25MPa, so that enough pressure is ensured, cement mortar is enabled to well infiltrate into a soil layer, and the quality of the high-pressure jet grouting pile is ensured.
The present invention in a preferred example may be further configured to: in the step S4, during the rotary spraying, the guniting device is inserted into the hole bottom and lifted after the rotary spraying for 20S.
Through adopting above-mentioned technical scheme, through spouting 20s at the hole bottom soon for the soil and the cement mortar misce bene at the hole bottom make high pressure spout the stake soon and have better, comparatively stable stake end, thereby effectively improve the stability of high pressure spout the stake soon, the effect of consolidating the ground is better.
The present invention in a preferred example may be further configured to: in step S4, the guniting device continues to rotate while being lifted, and the rotation direction of the guniting device changes to the reverse direction after every 1m-1.5m of lifting.
By adopting the technical scheme, the cement mortar is more fully collided with the soil by reversely rotating after lifting 1m-1.5m and continuously changing the rotating direction, so that the cement mortar is more uniformly mixed with the soil, and the quality of the high-pressure jet grouting pile is improved.
The present invention in a preferred example may be further configured to: the cement mortar also comprises the following components in parts by mass:
3-5 parts of octadecylsilane;
1-2 parts of zinc telluride.
By adopting the technical scheme, the octadecylsilane and zinc telluride are added into the cement mortar to be matched with each other, so that the compressive strength of the cement mortar after solidification is effectively improved, and the effect of reinforcing the foundation by the high-pressure jet grouting pile is better.
The present invention in a preferred example may be further configured to: the cement mortar also comprises the following components in parts by mass:
0.5-1 part of dimethyl diselenide.
By adopting the technical scheme, the compression strength of the solidified cement mortar is effectively further increased by adding the dimethyl diselenide into the cement mortar to match the octadecylsilane and the zinc telluride, so that the effect of reinforcing the foundation is better.
The present invention in a preferred example may be further configured to: the cement mortar also comprises the following components in parts by mass:
1-3 parts of glass fiber.
Through adopting above-mentioned technical scheme, through adding glass fiber in cement mortar for cement mortar is difficult for the fracture after the solidification, effectively improves the structural stability of high-pressure jet grouting pile, thereby makes high-pressure jet grouting pile consolidate the ground better.
The present invention in a preferred example may be further configured to: the preparation method of the cement mortar comprises the following steps:
s01, mixing water and portland cement, and uniformly stirring to form a premix;
s02, adding talcum powder into the premix, and uniformly stirring to form a medium mixture;
s02, adding silicon carbide and clay into the mixed material, and uniformly stirring to form cement mortar.
By adopting the technical scheme, the talcum powder is added into the premix firstly, and then the rest raw materials are added, so that the premix has good fluidity, all the raw materials are dispersed more uniformly, the quality of the cement mortar is improved, and the construction difficulty is reduced.
The present invention in a preferred example may be further configured to: octadecylsilane, zinc telluride, dimethyl diselenide and glass fiber are also added in the step S02.
By adopting the technical scheme, the prepared cement mortar has higher compressive strength and cracking resistance after being cured.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the method has the advantages that the pile hole is sealed, gas with the temperature of more than 100 ℃ is injected towards the pile hole, so that the soil on the wall of the pile hole is heated, a microporous structure in the soil is broken through, cement mortar is easy to permeate into the soil after penetrating through wall protection slurry, the permeation range of the cement mortar is expanded, and the action range of a single high-pressure jet grouting pile for reinforcing the foundation is larger;
2. by adding the silicon carbide into the cement mortar, the cutting effect of the cement mortar is better when the cement mortar is used for cutting a soil layer, the cement mortar is easier to spray into the soil layer, and meanwhile, the strength of the cured cement mortar is higher, so that the quality of a high-pressure rotary spraying pile is better;
3. through adding octadecylsilane chemically bonded, zinc telluride mutually supports in cement mortar, effectively improves the compressive strength after cement mortar solidification for the effect of high-pressure jet grouting pile reinforcing ground is better.
Drawings
Fig. 1 is a schematic flow chart of the high-pressure jet grouting pile construction process in the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the following examples and comparative examples:
the silicate cement is the silicate cement sold by Yanxin Yonggang group company Limited;
the water reducing agent is a rated FDN high-efficiency water reducing agent sold by Zhengzhou Jinfengda chemical product limited company;
the silicon carbide is silicon carbide sold by Hebei Shimao building materials Co.Ltd;
the talcum powder is 1250-mesh talcum powder sold by Orsena chemical Co., Ltd in Jiangyun city;
the clay is the clay sold by Lingshou county Xinfu mineral processing factory;
the octadecylsilane is octadecylsilane sold by Zhengzhou Jex chemical products Co., Ltd;
the zinc telluride is sold by Shanghai Ji to Biochemical technology limited;
the dimethyl diselenide is dimethyl diselenide sold by Shandong Xiya chemical industry Co., Ltd;
the glass fiber is short chopped glass fiber sold by Zibo Ponsen composite material Co.
Example 1
The preparation method of the cement mortar comprises the following steps:
s01, adding 100kg of Portland cement, 90kg of water and 11kg of water reducing agent into a stirring kettle, stirring at the rotating speed of 60r/min for 3min to form a premix.
S02, adding 5kg of talcum powder into the premix, stirring at the rotating speed of 75r/min for 2min to form a medium mixture;
s03, adding 10kg of silicon carbide and 15kg of clay into the mixed material, stirring for 3min at a rotating speed of 55r/min to form cement mortar, and continuously stirring at a rotating speed of 20r/min until the cement mortar is used.
Example 2
The preparation method of the cement mortar comprises the following steps:
s01, adding 100kg of Portland cement, 100kg of water and 10kg of water reducing agent into a stirring kettle, stirring at the rotating speed of 60r/min for 3min to form a premix.
S02, adding 6.5kg of talcum powder into the premix, stirring at the rotating speed of 75r/min for 2min to form a medium mixture;
s03, adding 11kg of silicon carbide and 17.5kg of clay into the mixed material, stirring for 3min at a rotating speed of 55r/min to form cement mortar, and continuously stirring until the cement mortar is used up at a rotating speed of 20 r/min.
Example 3
The preparation method of the cement mortar comprises the following steps:
s01, adding 100kg of Portland cement, 110kg of water and 9kg of water reducing agent into a stirring kettle, stirring at the rotating speed of 60r/min for 3min to form a premix.
S02, adding 8kg of talcum powder into the premix, stirring at the rotating speed of 75r/min for 2min to form a medium mixture;
s03, adding 12kg of silicon carbide and 20kg of clay into the mixture, stirring for 3min at a rotating speed of 55r/min to form cement mortar, and continuously stirring until the cement mortar is used up at a rotating speed of 20 r/min.
Example 4
The preparation method of the cement mortar comprises the following steps:
s01, adding 100kg of Portland cement, 100kg of water and 10kg of water reducing agent into a stirring kettle, stirring at the rotating speed of 60r/min for 3min to form a premix.
S02, adding 6kg of talcum powder into the premix, stirring at the rotating speed of 75r/min for 2min to form a medium mixture;
s03, adding 10kg of silicon carbide and 18kg of clay into the mixture, stirring for 3min at a rotating speed of 55r/min to form cement mortar, and continuously stirring at a rotating speed of 20r/min until the cement mortar is used.
Example 5
The difference from example 4 is that:
in step S03, octadecylsilane 3kg and zinc telluride 1kg are also added.
Example 6
The difference from example 4 is that:
in step S03, 4kg of octadecylsilane and 1.5kg of zinc telluride are also added.
Example 7
The difference from example 4 is that:
5kg of octadecylsilane and 2kg of zinc telluride are also added in the step S03.
Example 8
The difference from example 4 is that:
in step S03, octadecylsilane 3.3kg and zinc telluride 1.1kg are also added.
Example 9
The difference from example 4 is that:
3kg of octadecylsilane, 1kg of zinc telluride and 0.5kg of dimethyl diselenide are also added in the step S03.
Example 10
The difference from example 4 is that:
in step S03, 4kg of octadecylsilane, 1.5kg of zinc telluride and 0.75kg of dimethyl diselenide are also added.
Example 11
The difference from example 4 is that:
5kg of octadecylsilane, 2kg of zinc telluride and 1kg of dimethyl diselenide are also added in the step S03.
Example 12
The difference from example 4 is that:
3.3kg of octadecylsilane, 1.1kg of zinc telluride and 0.6kg of dimethyl diselenide are also added in the step S03.
Example 13
The difference from example 4 is that:
in step S03, 1kg of glass fiber was also added.
The length of the glass fiber was 0.3 mm.
Example 14
The difference from example 4 is that:
in step S03, 2kg of glass fiber was also added.
The length of the glass fiber was 0.3 mm.
Example 15
The difference from example 4 is that:
in step S03, 3kg of glass fiber was added.
The length of the glass fiber was 0.3 mm.
Example 16
The difference from example 4 is that:
in step S03, 2.5kg of glass fiber was also added.
The length of the glass fiber was 0.3 mm.
Example 17
The difference from example 4 is that:
3kg of octadecylsilane, 1kg of zinc telluride, 0.5kg of dimethyl diselenide and 1kg of glass fiber are also added in the step S03.
The length of the glass fiber was 0.3 mm.
Example 18
The difference from example 4 is that:
in step S03, 4kg of octadecylsilane, 1.5kg of zinc telluride, 0.75kg of dimethyl diselenide and 2kg of glass fiber are also added.
The length of the glass fiber was 0.3 mm.
Example 19
The difference from example 4 is that:
5kg of octadecylsilane, 2kg of zinc telluride, 1kg of dimethyl diselenide and 3kg of glass fiber are also added in the step S03.
The length of the glass fiber was 0.3 mm.
Example 20
The difference from example 4 is that:
3.3kg of octadecylsilane, 1.1kg of zinc telluride, 0.6kg of dimethyl diselenide and 2.5kg of glass fiber are also added in the step S03.
The length of the glass fiber was 0.3 mm.
Example 21
Referring to fig. 1, the invention discloses a high-pressure jet grouting pile construction process, which comprises the following steps:
s1, leveling a field, measuring and setting out according to design requirements, positioning and marking the position of the high-pressure jet grouting pile, and drilling and digging through a spiral drilling machine according to the mark to form a pile hole.
S2, the steel plate covers the opening portion of the pile hole, a circle of rubber sealing ring is conveniently covered on the opening portion of the pile hole, then the wall protection sleeve is inserted into the opening portion of the pile hole, finally the steel plate is pressed on the rubber sealing ring, an air supply pipe penetrating through the steel plate is welded on the steel plate, the air supply pipe is communicated with a valve, and the opening portion of the pile hole can be sealed by closing the valve.
S3, injecting 110 ℃ nitrogen into the pile hole from the air supply pipe through an air pump, keeping the constant pressure in the pile hole at 0.3Mpa, and preserving the heat for 10 min.
S4, closing a valve on the air supply pipe to keep the air pressure in the pile hole stable, unloading the air pump, stopping air supply, slowly opening the valve, and adjusting the opening amount of the valve to reduce the air pressure in the pile hole at the speed of 0.02MPa/min, so that the situation of hole collapse caused by the rapid change of the air pressure in the hole is avoided;
after the air pressure in the hole is recovered to the normal pressure, the steel plate and the rubber sealing ring are removed, clay slurry flows into the wall of the pile hole to form wall protection slurry, and a slurry pump is placed in the hole to pump out excessive slurry, so that slurry circulation is formed;
the method comprises the steps of extending a shotcrete pipe into a pile hole, inserting the shotcrete pipe into 5cm of soil at the bottom of the pile hole, starting a grouting pump, controlling grouting pressure to be 20MPa, starting lifting after the shotcrete pipe rotates in the soil for 20s, wherein the lifting speed is 100mm/min, the rotating direction is changed into reverse rotation every time the shotcrete pipe is lifted for 1m until the shotcrete pipe is lifted to a position 1.5m away from the opening of the pile hole, and slowing down the lifting speed to be 50mm/min until the shotcrete operation is completed;
and standing until cement mortar is cured, and in the process of curing the cement mortar, supplementing the cement mortar in time if the liquid level of the cement mortar at the opening part of the pile hole is found to be lowered, and forming the high-pressure jet grouting pile after the cement mortar is cured.
The cement mortar of example 20 was used as the cement mortar in this example.
In other embodiments, the cement mortars of embodiments 1-19 can also be used.
Example 22
The difference from example 21 is that:
in step S3, nitrogen gas with a temperature of 105 ℃ is injected into the pile hole, the constant pressure in the pile hole is kept at 0.4Mpa, and the temperature is kept for 7.5 min.
In step S4, the grouting pressure is 22.5 MPa.
In step S4, the rotation direction is changed to reverse rotation every time the shotcrete pipe is lifted by 1.25 m.
Example 23
The difference from example 21 is that:
in step S3, nitrogen gas of 110 ℃ is injected into the pile hole, the constant pressure in the pile hole is kept at 0.5Mpa, and the temperature is kept for 5 min.
In step S4, the grouting pressure is 25 MPa.
In step S4, the rotation direction is changed to reverse rotation every time the shotcrete pipe is lifted by 1.5 m.
Comparative example 1
The difference from example 4 is that:
no silicon carbide was added in step S03.
Comparative example 2
The difference from example 4 is that:
octadecylsilane 3.3kg was also added in step S03.
Comparative example 3
The difference from example 4 is that:
in step S03, 1.1kg of zinc telluride is also added.
Comparative example 4
The difference from example 4 is that:
0.6kg of dimethyl diselenide was also added in step S03.
Experiment 1
The cracking index of the samples prepared from the cement mortars of examples 1 to 20 and comparative examples was measured according to GB/T29417-2012 test method on the drying shrinkage cracking performance of cement mortars and concrete.
Experiment 2
The 7d compressive strength (MPa) and 28d compressive strength (MPa) of the samples prepared from the cement mortars of examples 1 to 20 and comparative examples were measured according to the compressive strength test in GB/T50081-2002 Standard test methods for mechanical Properties of ordinary concrete.
The specific experimental data are shown in Table 1
TABLE 1
According to the comparison of the data of the comparative example 1 and the data of the embodiment 4, the silicon carbide is added into the cement mortar, so that the compressive strength of a sample prepared by the cement mortar can be improved to a certain extent, the structural strength of the high-pressure jet grouting pile is better, and the quality of the high-pressure jet grouting pile is favorably improved.
According to the comparison of the data of the comparative examples 2-3 and the data of the examples 4-8, the octadecylsilane and the zinc telluride are independently added into the cement mortar, so that no obvious negative effect is caused on the physical properties of the sample prepared from the cement slurry, and when the octadecylsilane and the zinc telluride are matched according to a specific proportion, the compressive strength of the sample prepared from the cement mortar is effectively improved, and the structural stability of the high-pressure jet grouting pile is favorably improved.
According to the comparison of the data of the comparative example 4 and the data of the examples 4 and 9-12, the dimethyl diselenide is independently added into the cement mortar, so that the physical properties of the sample prepared from the cement mortar are not obviously influenced, and when the dimethyl diselenide is matched with the octadecylsilane and the zinc telluride, the compressive strength of the sample prepared from the cement mortar is effectively further improved, and the structural stability of the high-pressure jet grouting pile is better.
According to the comparison of the data of the examples 13 to 16 and the data of the example 4, the addition of the glass fiber into the cement mortar is helpful for enhancing the cracking resistance of the sample prepared by the cement mortar, so that the structural stability of the high-pressure jet grouting pile is better.
According to the data of the embodiments 17-20, the prepared cement mortar has the advantages that the prepared sample has good compressive strength and cracking resistance, the structural stability is good, and when the cement mortar is used for preparing the high-pressure jet grouting pile, the structural stability and the quality of the high-pressure jet grouting pile are good.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. A high-pressure jet grouting pile construction process is characterized by comprising the following steps: the method comprises the following steps:
s1, drilling towards the ground to form a pile hole;
s2, sealing the opening part of the pile hole;
s3, injecting gas with the temperature of more than 100 ℃, keeping the constant pressure in the pile hole at 0.3-0.5MPa, and preserving the heat for 5-10 min;
s4, deblocking the opening of the pile hole, and spraying cement mortar into the pile hole in a rotating mode through a mud protective wall to form a high-pressure rotating spraying pile;
the cement mortar comprises the following components in parts by weight:
100 parts of Portland cement;
10-12 parts of silicon carbide;
5-8 parts of talcum powder;
15-20 parts of clay;
90-110 parts of water.
2. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: in the step S3, nitrogen gas at 110-120 ℃ is injected.
3. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: in the step S4, the grouting pressure is 20-25 MPa.
4. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: in the step S4, during the rotary spraying, the guniting device is inserted into the hole bottom and lifted after the rotary spraying for 20S.
5. The high-pressure jet grouting pile construction process according to claim 4, characterized in that: in step S4, the guniting device continues to rotate while being lifted, and the rotation direction of the guniting device changes to the reverse direction after every 1m-1.5m of lifting.
6. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: the cement mortar also comprises the following components in parts by mass:
3-5 parts of octadecylsilane;
1-2 parts of zinc telluride.
7. The high-pressure jet grouting pile construction process according to claim 6, characterized in that: the cement mortar also comprises the following components in parts by mass:
0.5-1 part of dimethyl diselenide.
8. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: the cement mortar also comprises the following components in parts by mass:
1-3 parts of glass fiber.
9. The high-pressure jet grouting pile construction process according to claim 1, characterized in that: the preparation method of the cement mortar comprises the following steps:
s01, mixing water and portland cement, and uniformly stirring to form a premix;
s02, adding talcum powder into the premix, and uniformly stirring to form a medium mixture;
s02, adding silicon carbide and clay into the mixed material, and uniformly stirring to form cement mortar.
10. The high-pressure jet grouting pile construction process according to claim 9, characterized in that: octadecylsilane, zinc telluride, dimethyl diselenide and glass fiber are also added in the step S02.
CN202010066903.5A 2020-01-20 2020-01-20 High-pressure jet grouting pile construction process Pending CN111270671A (en)

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