CN109592950A - Heat resistant type strength cement-based grouting material and preparation method thereof - Google Patents

Heat resistant type strength cement-based grouting material and preparation method thereof Download PDF

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Publication number
CN109592950A
CN109592950A CN201811592772.3A CN201811592772A CN109592950A CN 109592950 A CN109592950 A CN 109592950A CN 201811592772 A CN201811592772 A CN 201811592772A CN 109592950 A CN109592950 A CN 109592950A
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China
Prior art keywords
grouting
heat resistant
cement
resistant type
type strength
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CN201811592772.3A
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CN109592950B (en
Inventor
宋涛文
韩宇栋
张剑
唐勋海
薛乃彦
邓宽
郑旗
王永焕
李晓东
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Beijing New Vision Building Construction Technology Co Ltd
Central Research Institute of Building and Construction Co Ltd MCC Group
China Jingye Engineering Corp Ltd
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Beijing New Vision Building Construction Technology Co Ltd
Central Research Institute of Building and Construction Co Ltd MCC Group
China Jingye Engineering Corp Ltd
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Publication of CN109592950A publication Critical patent/CN109592950A/en
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Classifications

    • 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
    • C04B28/06Aluminous 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
    • 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
    • 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
    • C04B28/08Slag 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
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2084Thermal shock resistance
    • 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
    • C04B2111/70Grouts, e.g. injection mixtures for cables for prestressed concrete
    • 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 belongs to the field of building materials, a kind of heat resistant type strength cement-based grouting material and preparation method thereof is specifically disclosed.The heat resistant type strength cement-based grouting material is by weight percentage, its raw material composition is as follows: cement 36%~48%, aggregate 45%~60%, mineral admixture 5%~12%, water-reducing agent 0.3%~0.6%, defoaming agent 0.01%~0.08%, stabilizer 0.01%~0.1%, swelling agent 0.5%~3.5%, fiber 0.1%~2%, and water 11%~15%, and removing the sum of each component except water is 100%.Heat resistant type strength cement-based grouting material of the invention has many advantages, such as heat-resisting, high fluidity, high-strength, microdilatancy, self-compaction.Heat resistant type strength cement-based grouting material of the present invention can be applied to the Equipment Foundations grouting works that service temperature has heat resistant requirements at 200~600 DEG C.

Description

Heat resistant type strength cement-based grouting material and preparation method thereof
Technical field
The invention belongs to building material technology application fields, are related to a kind of heat resistant type strength cement-based grouting material, the heat resistant type water Mud base grouting material can be applied to the basis transformation or back-grouting with 200~600 DEG C of heat resistant requirements such as metallurgy, petroleum, nuclear power Engineering, the invention further relates to the preparation methods of the heat resistant type strength cement-based grouting material.
Background technique
Cement-based grouting material is mainly used in column beam joint, plant bottom case, bridge pad, crane runway, steel structure column The grouting works such as foot, foot bolt fastening.Common cement-base grouting material maximum operation (service) temperature is 200 DEG C, when temperature continues to increase, Cement slurry in ordinary cement base grouting material will appear phenomenon of losing water, and porosity is caused to increase, strength reduction;Ordinary cement Aggregate in base grouting material also will appear swelling, and structure is caused to be destroyed.
Therefore, when strength cement-based grouting material Service Environment is higher than 200 DEG C, existing national standards " answer by cement-based grouting material With technical specification " thermal shock resistance and compressive strength rate restrictive requirement of the GB/T 50448-2015 to grouting material.
Chinese patent literature CN108793893A discloses a kind of heat resistance concrete and preparation method thereof, uses ordinary silicon Acid salt cement, basaltic broken stone and barite rubble, grain slag and self-control early strength polycarboxylic acid high performance dehydragent, have prepared one Kind is used for 200~1300 DEG C of heat resistance concrete.But grain slag used in the document and self-control diminishing are both needed to pretreatment or prefabricated, increase The preparation section of material is added, aggregate size used is also larger, is not suitable for common grouting works.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of heat resistant type strength cement-based grouting material, which has The features such as heat-resisting, high fluidity, high-strength, microdilatancy, self-compaction.
Another object of the present invention is to provide the preparation methods of above-mentioned heat resistant type strength cement-based grouting material.
To achieve the above object, the present invention adopts the following technical scheme:
According to an aspect of the present invention, heat resistant type strength cement-based grouting material provided by the invention, by weight percentage, Raw material composition is as follows:
In further preferred embodiment of the present invention, the heat resistant type strength cement-based grouting material, by weight percentage, Raw material composition is as follows:
Alternatively, by weight percentage, the raw material composition of the heat resistant type strength cement-based grouting material is as follows:
In heat resistant type strength cement-based grouting material of the present invention, the cement is the normal silicate that strength grade is not less than 42.5 One of cement, portland slag cement, portland cement, high alumina cement are a variety of.
The aggregate is one of quartz sand, basalt sand, alumina, flint clay, refractory brick particle or a variety of.
The mineral admixture is SILICA FUME, ground slag powder, two or more in fine-ground fly-ash;Wherein, described The specific surface area of SILICA FUME is 18000~20000m2/ kg, the specific surface area of the ground slag powder are 400~3000m2/ kg, The specific surface area of the fine-ground fly-ash is 400~800m2/kg。
The water-reducing agent is powdered high performance water reducing agent of polyocarboxy acid.
The defoaming agent is one of organic silicon defoamer, polyether antifoam agent.
The stabilizer is one of modified alta-mud, cellulose ether.
The swelling agent is swelling agent after plastic expansion agent and hardening.Wherein, the plastic expansion agent is molecular sieve, activity One of charcoal, p-nitrophenyl diazonium borofluoride;Swelling agent is that calcium sulphoaluminate class swelling agent, calcium oxide are swollen after the hardening One of swollen dose.
The fiber is one of steel fibre, polypropylene fibre, basalt fibre, aramid fiber or a variety of.More preferably Ground, the fiber include at least steel fibre.
According to another aspect of the present invention, the preparation method of above-mentioned heat resistant type strength cement-based grouting material provided by the invention, should Method includes:
By cement, aggregate, mineral admixture, water-reducing agent, defoaming agent, stabilizer, swelling agent and fiber according to above-mentioned weight Percentage is put into double-shaft paddle Agravicmixer, stirs 3~5min, and above-mentioned corresponding weight percent is added after going out machine in material The water of ratio continues 3~5min of stirring, obtains the heat resistant type strength cement-based grouting material.
Compared with prior art, the beneficial effects of the present invention are: using quality raw materials and proportion optimizing, preparation are provided There is the heat resistant type cement-based grouting material of the features such as heat-resisting, high fluidity, high-strength, microdilatancy, self-compaction, is suitable for 200~600 The basis transformation of DEG C heat resistant requirements or back-grouting engineering.Grouting material initial flow degree prepared by the present invention is up to 350mm, stream Dynamic degree 30min retention is up to 325mm;1d compression strength is up to 43.5MPa, and 28d compression strength is up to 121.6MPa.Specifically Ground, the present invention in,
(1) it uses high performance water reducing agent of polyocarboxy acid and controls water consumption, reduce the water-cement ratio of gelling system, so that gelling Moisture content is less after material hardening, and structure is finer and close, and porosity is lower, is not easy to cause porosity to increase because of dehydration when heated Greatly.
(2) compound use of mineral admixture increases the compactness of interfacial transition zone, also reduces cementitious material hardening Porosity afterwards, reduces high temperature deformation;In addition, the mineral constituent SiO in mineral admixture2And Al2O3With hydrolysis product of cement Ca(OH)2Between chemically react, generate the stronger silicic acid anhydride calcium of heat resistance and anhydrous calcium aluminate, alleviate gelling material Volume change after material hardening under the high temperature conditions.
(3) after plastic expansion agent and hardening swelling agent compound use, make grouting material of the present invention from the plastic stage to hard There is certain bulking effect in the change stage, realizes the microdilatancy of grouting material, improves the volume stability of material.
(4) fiber uses one of steel fibre, polypropylene fibre, basalt fibre, aramid fiber or a variety of, preferably Ground includes at least steel fibre.Fiber heat resistance used in the present invention is good, relatively stable under hot environment, and filling is greatly improved The performances such as compression strength, impact strength and the toughness of pulp material.
The preparation method of heat resistant type strength cement-based grouting material of the present invention is simple, and scene, which is added into water and uniformly stirred, carries out grouting work Industry.
Specific embodiment
It is next combined with specific embodiments below that the present invention is further explained.
Embodiment 1
CA50- I type aluminate cement 420kg, gradation flint clay 490kg, SILICA FUME 21kg, ground slag powder 48kg gather Carboxylic acid high-performance water reducing agent 4.7kg, polyether antifoam agent 0.3kg, modified alta-mud 1kg, molecular sieve 0.2kg, UEA swelling agent 5.5kg, steel fibre 7kg, basalt fibre 2.3kg.Above-mentioned raw material are put into Agravicmixer and stir 5min, out after machine 12.5% water is added, stirs 5min to get heat resistant type cement-based grouting material of the present invention.Grouting is measured under the conditions of standard curing The performance of material each age is as shown in table 1.
1 embodiment of table, 1 grouting material physical property
The grouting material initial flow degree and fluidity 30min retention that the present embodiment is prepared are all larger than 320mm, mobility It is good;28d compression strength reaches 121.6MPa, and intensity is high;Under the conditions of 600 DEG C after thermal shock 20 times, test block surface is without falling off, thermal shock It is 91% that test specimen immersion end and test specimen mark, which support the compressive strength rate of 28d, afterwards, and heat resistance is good.The Service Environment highest temperature can be met For 600 DEG C of Equipment Foundations back-grouting technical requirements.
Embodiment 2
PO42.5 ordinary portland cement 390kg, gradation quartz sand 510kg, SILICA FUME 31kg, ground slag powder 50kg, high performance water reducing agent of polyocarboxy acid 3.4kg, organosiloxane defoaming agent 0.3kg, cellulose ether 0.3kg, molecular sieve 0.2kg, UEA swelling agent 11.8kg, steel fibre 3kg.Above-mentioned raw material are put into Agravicmixer and stir 5min, are added after machine out 12.5% water stirs 3min to get heat resistant type cement-based grouting material of the present invention.Grouting material is measured under the conditions of standard curing The performance of each age is as shown in table 2.
2 embodiment of table, 2 grouting material physical property
The grouting material initial flow degree and fluidity 30min retention that the present embodiment is prepared are all larger than 320mm, mobility It is good;28d compression strength reaches 109.6MPa, and intensity is high;Under the conditions of 300 DEG C after thermal shock 20 times, test block surface is without falling off, thermal shock It is 92% that test specimen immersion end and test specimen mark, which support the compressive strength rate of 28d, afterwards, and heat resistance is good.The Service Environment highest temperature can be met For 300 DEG C of Equipment Foundations back-grouting technical requirements.
Embodiment 3
PSA42.5 portland slag cement 420kg, gradation basalt sand 470kg, SILICA FUME 17.5kg, pulverized powder Coal ash 70kg, high performance water reducing agent of polyocarboxy acid 4.5kg, organosiloxane defoaming agent 0.5kg, cellulose ether 0.5kg, active carbon 0.3kg, calcium oxide expansion agents 11.7kg, steel fibre 3.5kg, basalt fibre 1.5kg.Above-mentioned raw material are put into agravic 5min is stirred in mixing machine, 13% water is added after machine out, stirs 4min to get heat resistant type cement-based grouting material of the present invention. The performance that grouting material each age is measured under the conditions of standard curing is as shown in table 3.
3 embodiment of table, 3 grouting material physical property
The grouting material initial flow degree and 30min fluidity retention that the present embodiment is prepared are all larger than 310mm, mobility It is good;28d compression strength reaches 113.4MPa, and intensity is high;Under the conditions of 500 DEG C after thermal shock 20 times, test block surface is without falling off, thermal shock It is 92% that test specimen immersion end and test specimen mark, which support the compressive strength rate of 28d, afterwards, and heat resistance is good.It is 500 that Service Environment, which can be met, DEG C Equipment Foundations back-grouting technical requirements.
Embodiment 4
II 42.5 portland cement 415kg of P, refractory brick particle 485kg, SILICA FUME 20kg, ground slag powder 60kg gather Carboxylic acid high-performance water reducing agent 4.2kg, organosiloxane defoaming agent 0.3kg, cellulose ether 0.8kg, p-nitrophenyl diazonium fluoboric acid Salt 0.3kg, UEA swelling agent 5.4kg, steel fibre 9kg.Above-mentioned raw material are put into Agravicmixer and stir 5min, out machine 12% water is added afterwards, stirs 3min to get heat resistant type cement-based grouting material of the present invention.Grouting is measured under the conditions of standard curing The performance of material each age is as shown in table 4.
4 embodiment of table, 4 grouting material physical property
The grouting material performance indicator that the present embodiment is prepared meets III class grouting material standard of national standard, and 28d compression strength reaches 107.9MPa intensity is high;Under the conditions of 400 DEG C after thermal shock 20 times, test block surface is without falling off, test specimen immersion end and test specimen after thermal shock Marking and supporting the compressive strength rate of 28d is 95%, and heat resistance is good.The secondary filling of Equipment Foundations that Service Environment is 400 DEG C can be met Starch technical requirements.
Embodiment 5
PO42.5 ordinary portland cement 385kg, gradation alumina 510kg, SILICA FUME 28kg, fine-ground fly-ash 56kg, High performance water reducing agent of polyocarboxy acid 4kg, polyether antifoam agent 0.5kg, modified alta-mud 0.5kg, molecular sieve 0.3kg, calcium oxide are swollen Swollen dose of 10.7kg, steel fibre 3kg, polypropylene fibre 2kg.Above-mentioned raw material are put into Agravicmixer and stir 5min, out 13.5% water is added after machine, stirs 3min to get heat resistant type cement-based grouting material of the present invention.It is measured under the conditions of standard curing The performance of grouting material each age is as shown in table 5.
5 embodiment of table, 5 grouting material physical property
The grouting material performance indicator that the present embodiment is prepared meets III class grouting material standard of national standard, good fluidity;28d pressure resistance Degree is 87.5MPa, and intensity is high;Under the conditions of 200 DEG C after thermal shock 20 times, test block surface without falling off, after thermal shock test specimen immersion end with The compressive strength rate that test specimen mark supports 28d is 98%, and heat resistance is good.The Equipment Foundations two that Service Environment is 200 DEG C can be met Secondary grouting technique requirement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.

Claims (10)

1. a kind of heat resistant type strength cement-based grouting material, which is characterized in that by weight percentage, the raw material composition of the grouting material is such as Under:
And removing the sum of each component except water is 100%.
2. heat resistant type strength cement-based grouting material according to claim 1, which is characterized in that by weight percentage, the filling The raw material composition of slurry is as follows:
And removing the sum of each component except water is 100%.
3. heat resistant type strength cement-based grouting material according to claim 1, which is characterized in that by weight percentage, the filling The raw material composition of slurry is as follows:
And removing the sum of each component except water is 100%.
4. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the cement is intensity Grade is not less than 42.5 ordinary portland cement, portland slag cement, portland cement, one of high alumina cement or more Kind.
5. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the aggregate is quartz One of sand, basalt sand, alumina, flint clay, refractory brick particle are a variety of.
6. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the mineral admixture For two or more in SILICA FUME, ground slag powder, fine-ground fly-ash;Wherein, the specific surface area of the SILICA FUME is 18000 ~20000m2/ kg, the specific surface area of the ground slag powder are 400~3000m2/ kg, the specific surface area of the fine-ground fly-ash For 400~800m2/kg。
7. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the water-reducing agent is powder Last shape high performance water reducing agent of polyocarboxy acid;The defoaming agent is one of organic silicon defoamer, polyether antifoam agent;The stabilizer For one of modified alta-mud, cellulose ether.
8. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the swelling agent is modeling Property swelling agent and hardening after swelling agent, wherein the plastic expansion agent be molecular sieve, active carbon, p-nitrophenyl diazonium fluoboric acid One of salt;Swelling agent is one of calcium sulphoaluminate class swelling agent, calcium oxide expansion agents after the hardening.
9. heat resistant type strength cement-based grouting material according to claim 1-3, which is characterized in that the fiber is that steel is fine One of dimension, polypropylene fibre, basalt fibre, aramid fiber are a variety of.
10. a kind of preparation method of the described in any item heat resistant type strength cement-based grouting materials of claim 1-3, this method comprises:
By cement, aggregate, mineral admixture, water-reducing agent, defoaming agent, stabilizer, swelling agent and fiber according to the weight percent Than, it putting into double-shaft paddle Agravicmixer, stirs 3~5min, material goes out after machine to be added the water of the weight percent, after 3~5min of continuous stirring, obtains the heat resistant type strength cement-based grouting material.
CN201811592772.3A 2018-12-25 2018-12-25 Heat-resistant cement-based grouting material and preparation method thereof Active CN109592950B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110627436A (en) * 2019-09-24 2019-12-31 上海宝冶冶金工程有限公司 Heat-resistant concrete
CN111116132A (en) * 2019-12-25 2020-05-08 中冶建筑研究总院有限公司 Grouting material for combined structure and assembly type building node and preparation method thereof
CN111409193A (en) * 2020-05-13 2020-07-14 安徽中志轨道交通装备制造有限公司 Prefabricated sleeper and production equipment and method thereof
CN111470820A (en) * 2020-04-16 2020-07-31 扬州大学 Basalt fiber cement-based grouting material
CN112028570A (en) * 2020-08-19 2020-12-04 河海大学 Active powder grouting material and preparation method thereof
CN112028571A (en) * 2020-08-21 2020-12-04 湖北中南岩土工程有限公司 Cast-in-place pile for enhancing bearing strength of deep and thick miscellaneous fill area and construction method

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JP2005082416A (en) * 2003-09-05 2005-03-31 Denki Kagaku Kogyo Kk Polymer cement composition, polymer cement grout mortar and repairing material using the same
CN103936372A (en) * 2014-04-04 2014-07-23 中冶建筑研究总院有限公司 Self-fluidized heat-resistant cement-based grouting material, as well as preparation method and application thereof
CN108439905A (en) * 2018-04-25 2018-08-24 北京鸿锐嘉科技发展有限公司 Slip casting binder and its performance parameter detection method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005082416A (en) * 2003-09-05 2005-03-31 Denki Kagaku Kogyo Kk Polymer cement composition, polymer cement grout mortar and repairing material using the same
CN103936372A (en) * 2014-04-04 2014-07-23 中冶建筑研究总院有限公司 Self-fluidized heat-resistant cement-based grouting material, as well as preparation method and application thereof
CN108439905A (en) * 2018-04-25 2018-08-24 北京鸿锐嘉科技发展有限公司 Slip casting binder and its performance parameter detection method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110627436A (en) * 2019-09-24 2019-12-31 上海宝冶冶金工程有限公司 Heat-resistant concrete
CN111116132A (en) * 2019-12-25 2020-05-08 中冶建筑研究总院有限公司 Grouting material for combined structure and assembly type building node and preparation method thereof
CN111470820A (en) * 2020-04-16 2020-07-31 扬州大学 Basalt fiber cement-based grouting material
CN111409193A (en) * 2020-05-13 2020-07-14 安徽中志轨道交通装备制造有限公司 Prefabricated sleeper and production equipment and method thereof
CN111409193B (en) * 2020-05-13 2021-01-08 安徽中志轨道交通装备制造有限公司 Prefabricated sleeper and production equipment and method thereof
CN112028570A (en) * 2020-08-19 2020-12-04 河海大学 Active powder grouting material and preparation method thereof
CN112028571A (en) * 2020-08-21 2020-12-04 湖北中南岩土工程有限公司 Cast-in-place pile for enhancing bearing strength of deep and thick miscellaneous fill area and construction method
CN112028571B (en) * 2020-08-21 2021-06-18 湖北中南岩土工程有限公司 Cast-in-place pile for enhancing bearing strength of deep and thick miscellaneous fill area and construction method

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