CN114439001A - In-service pile foundation grouting reinforcement material and pile side directional grouting reinforcement method - Google Patents
In-service pile foundation grouting reinforcement material and pile side directional grouting reinforcement method Download PDFInfo
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- CN114439001A CN114439001A CN202210107205.4A CN202210107205A CN114439001A CN 114439001 A CN114439001 A CN 114439001A CN 202210107205 A CN202210107205 A CN 202210107205A CN 114439001 A CN114439001 A CN 114439001A
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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
- E02D5/64—Repairing piles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions 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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
Abstract
The invention relates to the technical field of existing pile foundation reinforcing engineering and grouting engineering, in particular to an in-service pile foundation grouting reinforcing material and a pile side directional grouting reinforcing method. The grouting reinforcement material is divided into A, B two kinds of slurry: the slurry A is prepared from the following components in a water-cement ratio (0.6-1): 1, a cement slurry; the slurry B is prepared by mixing the following components in percentage by mass: 1-2% of water-soluble glue, 1-2% of polymer polyol, 1-2% of alcohol polysaccharide, 15-25% of water glass and 70-80% of water. According to the pile side directional grouting reinforcement method, the grouting pipe is perforated once in the pile side grouting reinforcement, so that the grouting liquid is not deviated from the design direction during grouting, and the target pile foundation is accurately reinforced. And the physical and mechanical characteristics of the soil body around the pile can be effectively improved, the strength degradation of the pile foundation under load is reduced, and the vertical bearing capacity of the pile foundation is obviously improved, so that the safety and the stability of the upper structure of the bridge are ensured.
Description
Technical Field
The invention relates to the technical field of existing pile foundation reinforcing engineering and grouting engineering, in particular to an in-service pile foundation grouting reinforcing material and a pile side directional grouting reinforcing method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the rapid development of transportation industry, the reconstruction and expansion of the expressway are scheduled, and higher requirements are provided for the bearing capacity of the existing expressway bridge. Compared with the existing method for improving the bearing capacity of the bridge pile foundation, the pile side grouting reinforcement method has a good effect, is simple and convenient to operate and short in construction period, and is widely applied to the field of pile foundation reinforcement.
However, the traditional grouting process has the following problems: the slurry is diffused in the stratum without destination, so that the difference of the reinforcing effect on the pile foundation is large, and the influence on the peripheral pile foundation is easy to cause; in addition, the setting time of the slurry during grouting is not easy to regulate, so that the grouting process is relatively complex.
Disclosure of Invention
Aiming at the problems, the invention provides an in-service pile foundation grouting reinforcement material and a pile side directional grouting reinforcement method. The grouting material suitable for pile side grouting reinforcement is prepared, the directional grouting method can effectively prevent grout from returning upwards, prevent the grout from deviating from the design direction, accurately reinforce a target pile foundation, avoid the influence on a peripheral pile foundation, save cost and have certain economic benefit.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides an in-service pile foundation grouting reinforcement material and a pile side directional grouting reinforcement method, wherein the in-service pile foundation grouting reinforcement material comprises the following steps:
vertically drilling a hole to a designed depth by adopting a primary drilling hole, mounting a hole pipe, and sealing by using cement-water glass slurry;
the secondary drilling hole reaches the designed grouting depth;
opening a hole at one side of the grouting pipe, and then putting the grouting pipe into a secondary drilling hole for sealing;
re-drilling in the grouting pipe to the designed depth by using a drill bit;
and connecting the grouting pipe with the grout outlet pipe, and starting grouting to obtain the mortar.
In a second aspect of the invention, a grouting reinforcement material suitable for in-service pile foundations is provided, and the grouting material is divided into A, B two types of grout: the slurry A is prepared by mixing the following components in a water-cement ratio of 0.6-1: 1, a cement slurry; the slurry B is prepared by mixing the following components in percentage by mass: 1-2% of water-soluble glue, 1-2% of polymer polyol, 1-2% of alcohol polysaccharide, 15-25% of water glass and 70-80% of water.
The third aspect of the invention provides an application of the pile side directional grouting reinforcement method in bridge pile foundation construction.
The invention has the beneficial effects that:
(1) compared with the single traditional cement grout, the grouting material prepared by mixing A, B two grouts has the characteristics of adjustable setting time and high early strength.
(2) The grout is not skew design direction when slip casting can be guaranteed to slip casting pipe one side trompil, and the accurate target pile foundation that consolidates avoids causing the influence to peripheral pile foundation to can practice thrift the cost, have certain economic benefits.
(3) The method for reinforcing the existing pile foundation by directional grouting can improve the physical and mechanical properties of the soil body around the pile, reduce the strength degradation of the pile foundation under load, and obviously improve the vertical bearing capacity of the pile foundation, thereby ensuring the safety and stability of the upper structure of the bridge.
(4) The operation method is simple, low in cost, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of the in-service pile foundation pile side directional grouting reinforcement step;
FIG. 2 is a schematic view of a borehole;
FIG. 3 is a schematic view of the opening angle of the PVC pipe according to the present invention;
symbolic illustration in the drawings:
S1-S6 are in-service pile foundation pile side directional grouting steps; 1 is a primary orifice; 2 is an orifice pipe; 3 is a secondary orifice; 4 is a grouting pipe (such as a PVC pipe); 5 is a pile foundation; 6 is a grouting hole; alpha is the opening angle of the PVC pipe; d is the diameter of the pile foundation; and R is the distance from the center of the grouting hole to the center of the pile foundation.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
According to a first aspect of the invention, a grouting reinforcement material suitable for an in-service pile foundation is provided, and the grouting material is divided into A, B two types of slurry: the slurry A is prepared from the following components in a water-cement ratio (0.6-1): 1, a cement slurry; the slurry B is prepared by mixing the following components in percentage by mass: 1-2% of water-soluble glue, 1-2% of polymer polyol, 1-2% of alcohol polysaccharide, 15-25% of water glass and 70-80% of water;
further, the cement comprises: at least one of portland cement, sulphoaluminate cement, and ferro-aluminate cement;
further, the water-soluble gum is one or more of carrageenan, guar gum, fenugreek gum and xanthan gum;
further, the polymer polyol is one or more of polyethylene glycol-400, polyethylene glycol-2000 and polyethylene glycol-6000;
further, the alcohol polysaccharide is one or two of sodium alginate and curdlan;
further, the water glass is a sodium silicate aqueous solution, and the modulus of the water glass is 3.0;
the invention provides a method for reinforcing the pile side of an in-service pile foundation by directional grouting, which comprises the following steps:
s1, vertically drilling a hole to a designed depth by adopting a primary drilling hole, installing a hole pipe, and sealing by using cement-water glass slurry;
s2, enabling the secondary drilling hole to reach the designed grouting depth;
s3, forming a hole in one side of the grouting pipe, and then placing the grouting pipe into a secondary drilling hole for sealing;
s4, re-drilling in the grouting pipe to a designed depth by using a drill bit;
s5, preparing on-site grouting slurry;
s6, connecting a grouting pipe with a grout outlet pipe, and starting grouting;
further, in step S1, the primary drill hole opening diameter d1 ranges from 140mm to 90mm, and the diameter d2 of the common hole pipe is as follows
And the primary borehole diameter d1 is slightly larger than the orifice tube diameter d 2.
Further, in the step S2, the secondary drilling hole diameter d3 is between 130mm and 80mm and is slightly smaller than d 2.
Further, in the step S3, the diameter d4 of the grouting pipe (e.g., PVC pipe) is between 130mm and 80mm and slightly smaller than d3, the opening position of the grouting pipe is within the designed grouting section, a hole with the length of 5cm is opened every 5cm, and the opening angle α is between 60 ° and 120 °.
Further, in step S3, the calculation formula of the opening angle α is:
wherein D is the pile foundation diameter, and R is the distance between the centre of a circle of the grouting hole and the centre of a circle of the pile. The formula is obtained according to the position relation between the grouting hole and the pile foundation (as shown in fig. 3), and the experimental result shows that: the hole opening and grouting are carried out according to the calculation result of the formula, so that the reinforcing effect can be met, and grouting materials can be saved.
Further, in step S3, the opening direction of the grouting pipe (e.g., PVC pipe) is aligned with the center of the pile foundation and is placed into the secondary drilling hole.
Further, in the step S3, the secondary grouting hole sealing slurry is cement-water glass double-fluid slurry.
Further, in the step S4, the hole diameter d4 of the grouting pipe (e.g., PVC pipe) is between 120mm and 70mm, which is slightly smaller than d 3.
Further, in the step S5, A, B two slurries are prepared according to the formulation and method of the first aspect of the present invention.
Furthermore, in step S6, A, B two kinds of grout are respectively delivered through one grout outlet pipe, merged into one pipe and mixed, and then enter the formation through a grouting pipe to reinforce the in-service pile foundation.
Further, the sign of the end of grouting in step S6 is that the actual grouting amount reaches the designed grouting amount.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
In the following examples, the ordinary portland cement is available from shandong shun keli building materials.
In the following examples, the carrageenans, guar gum, fenugreek gum, xanthan gum are available from Hexati Biotech, Inc.
In the following examples, polyethylene glycol-400, polyethylene glycol-2000, and polyethylene glycol-6000 are available from Xin Lanxing science and technology, Inc.
In the following examples, sodium alginate, curdlan, was purchased from Lemna biosciences, Inc.
In the following examples, the water glass is available from Huixin chemical technology, Inc.
The experimental procedure carried out in the following examples included the following preliminary preparations:
(1) obtaining basic information of an original pile foundation and information of a soil body around the pile; (2) according to geological parameters and slurry properties, designing the diameter, depth and number of grouting holes around the pile; (3) and calculating the grouting amount of grouting in each hole.
Example 1
According to field data, the known test pile foundation has the length of 21m, the diameter D of 1.2m and the single-pile bearing capacity of 8100 KN; the soil body around the pile is a micro clay, sub clay and silt stratum from top to bottom; according to the injectivity of the soil layer, directional injection is carried out in a silt stratum with the depth of 6-8 mThe grout test shows that the grout reinforcement radius R is 0.5-0.6 m through a silt layer grouting test, so that grouting holes are selected to be 0.5m away from the periphery of a pile, R is 1.1m, the reinforcement depth is 6-8 m, the number of the grouting holes is 4, the grouting holes are arranged in a square shape, and the opening angle alpha of PVC is 66 degrees; according to the formula of grouting amount calculation
And calculating to obtain the grouting amount Q of each hole to be about 50L, wherein K is an empirical coefficient, r is a reinforcement radius, L is a reinforcement section length, n is porosity and alpha is a hole opening angle.
S1, vertically drilling a hole at a primary level, wherein the diameter of the hole is 133mm, the drilling depth is 8m, an orifice pipe with the diameter of 108mm is installed, and cement-water glass slurry is used for sealing;
s2, the diameter of a secondary drilling hole is 89mm, and the drilling depth is 8 m;
s3, the grouting pipe is a PVC pipe with the length of 8m, one side of the grouting pipe is provided with a hole, the hole opening angle alpha is 66 degrees, the hole opening length is 2m, the hole opening direction is aligned with the center of the pile foundation and is placed into a secondary drilling hole, and cement glass slurry is used for sealing;
s4, re-drilling in the grouting pipe to a designed depth by using a drill bit;
s5, preparing A, B two kinds of slurry for later use respectively, wherein the slurry A is a mixture of water and cement in a ratio of 0.8: 1 ordinary portland cement slurry; the slurry B is prepared from carrageenan, polyethylene glycol-400, sodium alginate, water glass and water according to a mass ratio of 1: 2: 2: 15: 80 are mixed; and obtaining the basic properties of the slurry;
s6, connecting a grouting pipe with a grout outlet pipe, and starting grouting; the grouting pressure is strictly controlled in the grouting process, so that the phenomena of slurry leakage, slurry leakage and stratum uplift are prevented; the grouting end mark is controlled by the grouting amount, and when the actual grouting amount reaches the designed grouting amount, grouting is stopped.
According to the technical specification of the building pile foundation JGJ 94-2008, after grouting for 15d, a static load test is carried out, the bearing capacity of the pile foundation is 9350kN, and the lifting amplitude is 15.4%.
Example 2
According to field data, the known test pile foundation has the length of 40m, the diameter D of 1.0m and the single-pile bearing capacity 10200 KN; the soil body around the pile is a micro clay, sub clay and silt stratum from top to bottom; according to the groutability of a soil layer, a directional grouting test is carried out in a silt stratum with the depth of 10-15 m, and the grouting test of the silt stratum can show that the grout reinforcement radius R is 0.5-0.6 m, so that grouting holes are selected to be 0.5m away from the periphery of a pile, R is 1.1m, the reinforcement depth is 10-15 m, the number of the grouting holes is 4, the grouting holes are arranged in a square shape, and the opening angle alpha of PVC is 54 degrees; according to the formula of grouting amount calculation
And calculating to obtain the grouting amount Q of each hole to be about 100L, wherein K is an empirical coefficient, r is a reinforcement radius, L is a reinforcement section length, n is porosity and alpha is a hole opening angle.
S1, vertically drilling a hole with the diameter of 133mm in a primary drilling hole, the drilling depth of 15m, installing an orifice pipe with the diameter of 108mm, and sealing by using cement-water glass slurry;
s2, the diameter of a secondary drilling hole is 89mm, and the drilling depth is 15 m;
s3, the grouting pipe is a PVC pipe with the length of 15m, one side of the grouting pipe is provided with a hole, the hole opening angle alpha is 54 degrees, the hole opening length is 5m, the hole opening direction is aligned to the center of the pile foundation and is placed into a secondary drilling hole, and cement glass slurry is used for sealing;
s4, re-drilling in the grouting pipe to a designed depth by using a drill bit;
s5, preparing A, B two kinds of slurry for later use respectively, wherein the slurry A is a mixture of water and cement in a ratio of 0.8: 1 ordinary portland cement slurry; the serous fluid B is prepared from fenugreek gum, polyethylene glycol-400, sodium alginate, water glass and water according to a mass ratio of 2: 2: 2: 19: 75 mixing the raw materials; and obtaining the basic properties of the slurry;
s6, connecting a grouting pipe with a grout outlet pipe, and starting grouting; the grouting pressure is strictly controlled in the grouting process, so that the phenomena of slurry leakage, slurry leakage and stratum uplift are prevented; the grouting end mark is controlled by the grouting amount, and when the actual grouting amount reaches the designed grouting amount, grouting is stopped.
According to the technical specification of the building pile foundation JGJ 94-2008, after grouting is finished for 15d, a static load test is carried out, the bearing capacity of the pile foundation is 15070kN, and the lifting amplitude is 47.7%.
Example 3
According to field data, the known test pile foundation has the length of 40m, the diameter D of 1.0m and the single-pile bearing capacity 10200 KN; the soil body around the pile is a micro clay, sub clay and silt stratum from top to bottom; according to the groutability of a soil layer, a directional grouting test is carried out in a silt stratum with the depth of 10-15 m, and the grouting test of the silt stratum can show that the grout reinforcement radius R is 0.5-0.6 m, so that grouting holes are selected to be 0.5m away from the periphery of a pile, R is 1.1m, the reinforcement depth is 10-15 m, the number of the grouting holes is 4, the grouting holes are arranged in a square shape, and the opening angle alpha of PVC is 54 degrees; according to the formula of grouting amount calculation
And calculating to obtain the grouting amount Q of each hole to be about 100L, wherein K is an empirical coefficient, r is a reinforcement radius, L is a reinforcement section length, n is porosity and alpha is a hole opening angle.
S1, vertically drilling a hole with the diameter of 133mm in a primary drilling hole, the drilling depth of 15m, installing an orifice pipe with the diameter of 108mm, and sealing by using cement-water glass slurry;
s2, the diameter of a secondary drilling hole is 89mm, and the drilling depth is 15 m;
s3, the grouting pipe is a PVC pipe with the length of 15m, one side of the grouting pipe is provided with a hole, the hole opening angle alpha is 54 degrees, the hole opening length is 5m, the hole opening direction is aligned to the center of the pile foundation and is placed into a secondary drilling hole, and cement glass slurry is used for sealing;
s4, re-drilling in the grouting pipe to a designed depth by using a drill bit;
s5, preparing A, B two kinds of slurry for later use respectively, wherein the slurry A is a mixture of water and cement in a ratio of 0.8: 1 ordinary portland cement slurry; the slurry B is prepared from two kinds of glue according to a mass ratio of 1: 1 (including fenugreek gum + carrageenan, fenugreek gum + xanthan gum, fenugreek gum + guar gum), polyethylene glycol-400, sodium alginate, water glass and water according to a mass ratio of 2: 2: 2: 19: 75 mixing the raw materials; and obtaining the basic properties of the slurry;
s6, connecting a grouting pipe with a grout outlet pipe, and starting grouting; the grouting pressure is strictly controlled in the grouting process, so that the phenomena of slurry leakage, slurry leakage and stratum uplift are prevented; the grouting end mark is controlled by the grouting amount, and when the actual grouting amount reaches the designed grouting amount, grouting is stopped.
According to the technical specification of the building pile foundation JGJ 94-2008, after grouting is finished for 15d, a static load test is carried out, and the obtained pile foundation bearing capacities are 15180kN, 16280kN and 169930 kN respectively.
Compared with the embodiment 2, the pile side directional grouting reinforcement method has the advantages that under the same other conditions, the grouting material obtained by combining fenugreek gum and other water-soluble gums is adopted, and the bearing capacity of the pile foundation can be effectively improved compared with single water-soluble gum.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. 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. An in-service pile foundation grouting reinforcement material and a pile side directional grouting reinforcement method are characterized by comprising the following steps:
vertically drilling a hole to a designed depth by adopting a primary drilling hole, mounting a hole pipe, and sealing by using cement-water glass slurry;
the secondary drilling hole reaches the designed grouting depth;
opening a hole at one side of the grouting pipe, and then putting the grouting pipe into a secondary drilling hole for sealing;
re-drilling in the grouting pipe to the designed depth by using a drill bit;
and connecting the grouting pipe with the grout outlet pipe, and starting grouting to obtain the mortar.
2. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method as claimed in claim 1, wherein the aperture d1 of the primary drilling hole is 140 mm-90 mm;
or the diameter d2 of the orifice pipe is specified as
Or
Alternatively, the primary bore diameter d1 is greater than the orifice tube diameter d 2.
3. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method as claimed in claim 1, wherein the diameter d3 of the secondary drilled hole is 130-80 mm smaller than the diameter d2 of the orifice pipe.
4. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method as claimed in claim 1, wherein the diameter d4 of the grouting pipe is 130 mm-80 mm and smaller than d3, the opening position of the grouting pipe is in the designed grouting section, holes with the length of 5-8 cm are formed every 5-8 cm, and the opening angle alpha is 60-120 degrees.
5. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method according to claim 4, wherein the calculation formula of the opening angle α is as follows:
wherein D is the pile foundation diameter, and R is the distance between the centre of a circle of the grouting hole and the centre of a circle of the pile.
6. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method according to claim 1, wherein the opening direction of the grouting pipe is aligned with the center of the pile foundation and placed into the secondary drilling hole.
7. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method according to claim 1, wherein the secondary grouting hole sealing slurry is cement-water glass two-fluid slurry.
8. The in-service pile foundation grouting reinforcement material and the pile side directional grouting reinforcement method as claimed in claim 1, wherein the grouting is two-fluid grouting, A, B two kinds of grouts are respectively delivered through a grout outlet pipe and are merged into a pipe to be mixed, and then the grouting pipe enters the stratum to reinforce the in-service pile foundation.
9. The utility model provides a be applicable to in-service pile foundation slip casting reinforcing material which characterized in that, the slip casting material divide into A, B two kinds of thick liquids: the slurry A is prepared by mixing the following components in a water-cement ratio of 0.6-1: 1, a cement slurry; the slurry B is prepared by mixing the following components in percentage by mass: 1-2% of water-soluble glue, 1-2% of polymer polyol, 1-2% of alcohol polysaccharide, 15-25% of water glass and 70-80% of water.
10. The pile side directional grouting reinforcement method is applied to bridge pile foundation construction.
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| CN108678041A (en) * | 2018-05-23 | 2018-10-19 | 山东大学 | A kind of existing Bearing Capacity of Pile Foundation slip casting method for improving |
| CN111364532A (en) * | 2020-03-24 | 2020-07-03 | 山东农业大学 | Existing pile foundation reinforcing method based on slurry control |
| CN111396086A (en) * | 2020-03-25 | 2020-07-10 | 中铁二十三局集团第四工程有限公司 | Sleeve method curtain grouting construction method |
| CN112813970A (en) * | 2019-11-15 | 2021-05-18 | 中国石油化工集团有限公司 | Method for reinforcing pile foundation by offshore inclined directional grouting |
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2022
- 2022-01-28 CN CN202210107205.4A patent/CN114439001A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101117293B1 (en) * | 2011-05-03 | 2012-03-20 | 녹우건설(주) | Cement milk injection method for pile construction |
| CN103089276A (en) * | 2013-01-28 | 2013-05-08 | 中国矿业大学 | Deep-shallow hole and high-low pressure coupling grouting technology |
| CN206397469U (en) * | 2017-01-19 | 2017-08-11 | 临沂会宝岭铁矿有限公司 | A kind of logical fixed leakproof sizing device of cardioid drilling |
| CN108678041A (en) * | 2018-05-23 | 2018-10-19 | 山东大学 | A kind of existing Bearing Capacity of Pile Foundation slip casting method for improving |
| CN108484058A (en) * | 2018-06-12 | 2018-09-04 | 山东大学 | A kind of anti-dispersion plugging material of dynamic water and preparation method thereof |
| CN112813970A (en) * | 2019-11-15 | 2021-05-18 | 中国石油化工集团有限公司 | Method for reinforcing pile foundation by offshore inclined directional grouting |
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| CN111396086A (en) * | 2020-03-25 | 2020-07-10 | 中铁二十三局集团第四工程有限公司 | Sleeve method curtain grouting construction method |
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