CN110952528A - Construction method of cement-soil underground continuous wall under complex geological conditions - Google Patents
Construction method of cement-soil underground continuous wall under complex geological conditions Download PDFInfo
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- CN110952528A CN110952528A CN201811121803.7A CN201811121803A CN110952528A CN 110952528 A CN110952528 A CN 110952528A CN 201811121803 A CN201811121803 A CN 201811121803A CN 110952528 A CN110952528 A CN 110952528A
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- 239000002689 soil Substances 0.000 title claims abstract description 107
- 238000010276 construction Methods 0.000 title claims abstract description 88
- 238000005520 cutting process Methods 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000003801 milling Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 18
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 238000007596 consolidation process Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 238000003908 quality control method Methods 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000002173 cutting fluid Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
- E02F3/10—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain with tools that only loosen the material, i.e. with cutter-type chains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
- E02F3/12—Component parts, e.g. bucket troughs
- E02F3/14—Buckets; Chains; Guides for buckets or chains; Drives for chains
- E02F3/142—Buckets; Chains; Guides for buckets or chains; Drives for chains tools mounted on buckets or chains which loosen the soil, e.g. cutting wheels, or the like
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
- E02F3/12—Component parts, e.g. bucket troughs
- E02F3/14—Buckets; Chains; Guides for buckets or chains; Drives for chains
- E02F3/144—Buckets; Chains; Guides for buckets or chains; Drives for chains emptying or cleaning the buckets, e.g. in combination with spoil removing equipment
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of constructional engineering, in particular to a construction method of a cement-soil underground continuous wall under complex geological conditions, which aims to solve the problems that the existing TRD construction method is difficult to cut, slow in construction progress, large in equipment abrasion and the like in a high-strength compact gravel soil stratum. The method comprises the following specific steps: exploring geological conditions, exploring the soil property characteristics of the depth range, and performing corresponding wall trial work; carrying out double-wheel milling deep-stirring cutting construction; carrying out construction for cleaning gravel soil by a grab bucket of an underground continuous wall trenching machine; carrying out backfilling plain soil filling construction; the construction method of the cement-soil underground continuous wall with the complex geological conditions has the advantages of avoiding equipment loss, saving cutting time, reducing the construction difficulty of the cement-soil continuous wall, improving the construction quality and the construction efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a construction method of a cement-soil underground diaphragm wall under complex geological conditions.
Background
The TRD construction method is developed in the early 90 s of Japan, and is complete equipment and a construction method capable of continuously forming walls in various soil layers and gravel layers. The basic principle is that a chain saw type cutter box is vertically inserted into the ground and then horizontally and transversely moves, meanwhile, a chain drives a cutter to vertically rotate, raw soil is stirred and mixed, grout such as cement paste and the like is poured into the mixed raw soil, and the wall with a certain thickness is formed. The wall is characterized by continuous wall forming, smooth surface, consistent thickness and good uniformity of the wall. The method is mainly applied to the aspects of foundation reinforcement, seepage-proofing treatment and the like of various building projects, underground projects, bank protection projects, dams and embankments.
However, the TRD equipment is limited by its cutting ability, and in a dense hard stratum with a thick stratum and high strength, the equipment is difficult to cut, the construction progress is slow, and even the construction cannot be performed.
The double-wheel milling deep stirring method is a new technology for high-efficiency construction, wherein an in-situ soil body is cut and stirred by rotating two milling wheels around a horizontal shaft, and consolidation slurry such as cement slurry is injected to the in-situ soil body and is fully stirred to form a uniform cement soil wall body which can be used as a seepage-proofing wall and a retaining wall or used for reinforcing and improving a stratum. The method has the advantages of strong cutting performance, high construction precision and the like. But the cutting is difficult in the dense gravel soil stratum with higher strength, the equipment abrasion is large, and the construction progress is slow.
At present, double-wheel milling deep stirring equipment or TRD equipment is generally used for independent operation according to specific geological conditions in the construction of the cement-soil underground continuous wall, and equipment loss is caused by continuous construction of single equipment. When the construction condition of complex geology is faced, the maximum advantage of the equipment cannot be exerted, and the construction progress is slow.
Disclosure of Invention
The invention aims to provide a construction method of a cement-soil underground continuous wall under complex geological conditions, which adopts a milling-grabbing combined treatment mode, namely, double-wheel milling deep stirring equipment is adopted to cut soil layers above a gravel soil layer, the construction verticality can reach 3 per thousand, a guiding effect is achieved for the construction of a grab bucket of an underground continuous wall trenching machine, then large-particle-size gravel soil is cleaned through the grab bucket of the underground continuous wall trenching machine and enters a watertight layer, a continuous open trench section is formed after the grab bucket is constructed, and finally, TRD equipment is utilized to stir and inject slurry to form the cement-soil continuous wall, so that the problems that the existing TRD construction method is difficult to cut in a dense gravel soil layer with higher strength, the construction progress is slow, the equipment is large in abrasion and the like are solved.
The invention is realized in this way, a construction method of cement-soil underground continuous wall with complex geological condition, comprising the following steps:
step one, exploring geological conditions, exploring the soil property characteristics of the depth range, and performing corresponding wall trial work;
step two, performing double-wheel milling deep-stirring cutting construction;
thirdly, carrying out construction for cleaning gravel soil by using a grab bucket of an underground continuous wall trenching machine;
fourthly, carrying out backfilling plain filling construction;
and fifthly, carrying out TRD cement soil continuous wall construction.
Further, the complex geological condition is divided into three depths from top to bottom, the first depth mainly comprises cohesive soil, silt and sandy soil, and the soil strength is low; the second depth mainly comprises gravel soil, and the soil compaction degree is high; the third depth is mainly composed of impervious layers such as strongly weathered conglomerates and cohesive soil, and the strength is general.
Further, dense gravelly soil is distributed in the construction range of the TRD cemented soil underground diaphragm wall, a watertight layer is arranged at the bottom of the TRD cemented soil underground diaphragm wall, high requirements on grooving construction quality and wall protection slurry quality control are met, and normal construction and efficient operation cannot be carried out by the traditional process;
further, the second step of double-wheel milling deep-stirring cutting construction is that the in-situ soil body is cut and stirred by the rotation of the two milling wheels around a horizontal shaft, and consolidation slurry such as cement slurry is injected and fully stirred to form a uniform cement soil wall body which can be used as a seepage-proof wall and a retaining wall or used for reinforcing and improving the stratum;
furthermore, in the third step, the grab bucket of the underground continuous wall trenching machine is used for cleaning the gravel soil, the performance of cleaning the harder in-situ soil body by using the grab bucket of the underground continuous wall trenching machine is superior, and the gravel soil is grabbed out and grabbed to the impervious layer;
further, the backfilling plain filling construction in the fourth step is implemented by utilizing an excavator to backfill plain filling so as to supplement the vacant soil layer after the gravel soil is cleaned by the grab bucket of the underground continuous wall trenching machine, so that the construction quality is ensured;
further, the step five TRD cement soil continuous wall construction is a construction process that a cutting box which meets the design depth and is attached with a cutting chain and a cutter head is inserted underground, and consolidation slurry such as cement slurry is injected into the foundation while longitudinal cutting and transverse pushing are carried out to form a groove, so that the cement soil continuous wall is fully mixed and stirred with an original foundation to form a continuous wall with the same thickness underground.
According to the construction method, the double-wheel milling deep-stirring equipment with strong cutting performance is preferentially selected to cut the cohesive soil, the silt and the sandy soil, after the double-wheel milling deep-stirring equipment cuts, construction for cleaning gravel soil by a grab bucket of an underground continuous wall trenching machine is simultaneously carried out behind the double-wheel milling deep-stirring equipment, then backfilling plain filling construction of an excavator is carried out, and after the backfilling plain filling construction, the TRD cement continuous wall is subsequently constructed.
The invention provides a construction method of a cement-soil underground continuous wall under complex geological conditions, which is characterized in that a plurality of devices are arranged and constructed simultaneously along the same direction, and the device loss caused by long-time work of a single device in a hard stratum in the traditional method is avoided. The respective advantages of the equipment are fully utilized: the double-wheel milling deep-stirring equipment has strong cutting performance; the performance of the grab bucket of the underground continuous wall trenching machine for removing harder in-situ soil is superior; the TRD equipment is continuous in wall construction, smooth in surface, consistent in thickness and good in wall uniformity. In addition, the grab bucket of the underground continuous wall trenching machine is used for cleaning the gravel soil, so that equipment loss caused by double-wheel milling deep stirring equipment or TRD equipment during construction of the gravel soil layer with extremely high hardness can be avoided, the construction difficulty of the cement continuous wall is reduced, the cutting time is effectively saved, and the construction quality and the construction efficiency are improved.
Drawings
FIG. 1 is a flow chart of a construction method of a cement-soil underground continuous wall under complex geological conditions in the embodiment of the invention.
FIG. 2 is a construction state diagram of the construction method of the cement-soil underground continuous wall under the complex geological condition in the embodiment of the invention.
FIG. 3 is a construction state diagram of the middle-lower cutting box in the construction method of the cement-soil underground diaphragm wall with complex geological conditions in the embodiment of the invention.
FIG. 4 is a forward cutting construction state diagram of TRD equipment in the construction method of the cement-soil underground diaphragm wall with complex geological conditions in the embodiment of the invention.
FIG. 5 is a drawing of a TRD equipment return trip cutting construction state in the construction method of the cement-soil underground continuous wall under the complex geological condition in the embodiment of the invention.
FIG. 6 is a construction state diagram of wall construction by stirring and solidifying a TRD device in the construction method of the cement-soil underground continuous wall with complex geological conditions in the embodiment of the invention.
Illustration of the drawings:
1-cohesive soil, silt and sandy soil layers; 2-a gravel soil layer; 3-impervious layers of strongly weathered conglomerates, cohesive soils and the like; 4-plain filling; 5-double-wheel milling and deep stirring equipment; 6-underground continuous wall grooving machine; 7-an excavator; 8-a TRD device; 9-cement soil underground continuous wall body; 10-cutting box.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
Example (b):
the cement soil underground continuous wall construction method under the complex geological conditions is specifically applied to construction of a certain residential area, a residential area with higher density is built around the residential area, an original construction stratum is divided into three depths from top to bottom, and the first depth mainly comprises cohesive soil, silt and sand; the second depth is mainly composed of gravel soil; the third depth is mainly composed of a water impervious layer 3 of strongly weathered conglomerate, cohesive soil, or the like. The shape of the underground continuous wall is approximate to an L shape, and a foundation pit adopts a supporting mode that H-shaped steel and 1-2 rotary spraying anchor rods are inserted into a cement-soil underground continuous wall with the thickness of 800 mm. The excavation depth of the foundation pit is 6.91-10.16 m, the construction depth is 18.5m, and a waterproof curtain enters a impervious layer 3 of strongly weathered conglomerate, cohesive soil and the like, which is not less than 1.5m, so that a confined aquifer is completely cut off.
The flow of the construction method of the cement-soil underground continuous wall with the complex geological conditions is shown in figure 1, and the construction method specifically comprises the following steps:
(1) geological conditions are explored, and the distribution of the construction stratum from top to bottom of rock layers is as follows: cohesive soil, silt and sand layers 1, a gravel layer 2 and impervious layers 3 such as strongly weathered conglomerate and cohesive soil. And selecting double-wheel milling and deep stirring equipment 5 with strong cutting performance to test the wall. When the double-wheel milling deep stirring device 5 is constructed to 14m (namely the absolute elevation is 56.5-14=42.5 m), the drilling is difficult. Has entered the impervious bed 3 of strongly weathered conglomerate, cohesive soil, etc.
(2) The clay, silt and sandy soil layer 1 to the top of the gravel soil layer 2 are cut by a double-wheel milling deep-stirring device 5, the speed is controlled in the cutting process, the water consumption is increased, and the specific gravity of the slurry is not more than 1.3.
(3) The gravel soil layer 2 is grabbed out by a grab bucket of an underground continuous wall trenching machine 6, and the gravel soil layer is grabbed to 1m below a impervious layer 3 of strongly weathered conglomerate, cohesive soil and the like to reach the designed depth.
(4) Backfilling plain filling 4 by using an excavator 7 to ensure the wall forming quality.
(5) The TRD device 8 main machine is in place at the pre-groove position, and a steel plate needs to be laid at the corresponding construction position to meet the construction requirement.
(6) And (5) hoisting the embedded box. Excavating an embedded hole with the depth of about 3m, the length of about 2m and the width of about 1m by using an excavator 7, lowering the embedded box, and then putting the cutting boxes 10 into the embedded box section by section.
(7) The cutting box 10 is connected to the TRD device 8 host. At first, the TRD device 8 host computer moves to pre-buried acupuncture point and puts and connect cutting case 10, then the TRD device 8 host computer returns to predetermined construction position again and carries out vertical cutting, so relapse until satisfying the design depth requirement.
(8) And (6) advancing for cutting. The cutting fluid (bentonite slurry) is injected, and for the formation and the area where the self-made slurry can be obtained, tap water may be directly injected without disposing the bentonite slurry.
(9) And (4) cutting in a return stroke. And injecting cutting fluid to perform secondary cutting on the soil body.
(10) Stirring and curing to form the wall. Grouting consolidation slurry such as cement paste and the like, and fully stirring the consolidation slurry and the in-situ soil body to form the cement soil underground continuous wall body 9 with the same thickness.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A construction method of a cement-soil underground continuous wall with complex geological conditions is characterized by comprising the following steps:
step one, exploring geological conditions, exploring the soil property characteristics of the depth range, and performing corresponding wall trial work;
step two, performing double-wheel milling deep-stirring cutting construction;
thirdly, carrying out construction for cleaning gravel soil by using a grab bucket of an underground continuous wall trenching machine;
fourthly, carrying out backfilling plain filling construction;
and fifthly, carrying out TRD cement soil continuous wall construction.
2. The method for constructing the cement-soil underground diaphragm wall under the complicated geological condition as claimed in claim 1, wherein the complicated geological condition is divided into three depths from top to bottom, the first depth mainly comprises cohesive soil, silty soil and sandy soil, and the soil strength is low; the second depth mainly comprises gravel soil, and the soil compaction degree is high; the third depth is mainly composed of impervious layers such as strongly weathered conglomerates and cohesive soil, and the strength is general.
3. The method for constructing the cement-soil underground continuous wall under the complicated geological conditions as claimed in claim 1, wherein dense gravelly-crushed soil is distributed in the construction range of the TRD cement-soil underground continuous wall, a water-impermeable layer is arranged at the bottom of the TRD cement-soil underground continuous wall, high requirements are made on grooving construction quality and wall-protecting slurry quality control, and normal construction and efficient operation cannot be carried out by a traditional process;
in the second step of double-wheel milling deep-stirring cutting construction, the in-situ soil body is cut and stirred by rotating the two milling wheels around a horizontal shaft, and consolidation slurry such as cement paste and the like is injected and fully stirred to form a uniform cement soil wall body which can be used as a seepage-proofing wall and a retaining wall or used for reinforcing and improving the stratum;
thirdly, in the construction of cleaning gravel soil by using the grab bucket of the underground continuous wall trenching machine, the performance of cleaning harder in-situ soil body by using the grab bucket of the underground continuous wall trenching machine is superior, and the gravel soil is grabbed out and is grabbed to the impervious layer;
backfilling plain filling construction is carried out, namely backfilling plain filling by utilizing an excavator to supplement the vacant soil layer after the gravel soil is cleaned by the grab bucket of the underground continuous wall trenching machine so as to ensure the construction quality;
the step five TRD cement soil continuous wall construction is a construction process that a cutting box which meets the design depth and is attached with a cutting chain and a cutter head is inserted underground, and consolidation slurry such as cement slurry is injected into the foundation while longitudinal cutting and transverse pushing are carried out to form a groove, so that the cement soil continuous wall is fully mixed and stirred with an original foundation to form a continuous wall with equal thickness underground.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942310A (en) * | 2021-01-26 | 2021-06-11 | 上海兴庚基础工程有限公司 | Construction process of equal-thickness cement-soil stirring continuous wall |
| CN113529720A (en) * | 2021-07-06 | 2021-10-22 | 上海市基础工程集团有限公司 | Wall forming and slurry parameter control method for milling equal-thickness cement-soil continuous steel wall on thick sand layer |
| CN113638422A (en) * | 2021-09-04 | 2021-11-12 | 浙江艮威水利建设有限公司 | Deep foundation pit construction method |
| CN114753348A (en) * | 2022-05-20 | 2022-07-15 | 上海隧道工程有限公司 | Construction method of complex stratum ultra-deep ultra-thick underground diaphragm wall |
| CN116104155A (en) * | 2023-04-12 | 2023-05-12 | 广东水电二局股份有限公司 | Quick grooving method for ultra-deep underground diaphragm wall of soft soil stratum |
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| JP2000309919A (en) * | 1999-04-26 | 2000-11-07 | Taisei Corp | Construction method of soil cement diaphragm wall |
| CN106223381A (en) * | 2016-08-31 | 2016-12-14 | 徐州徐工基础工程机械有限公司 | A kind of dual-use type construction of diaphragm wall equipment |
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| JP2000309919A (en) * | 1999-04-26 | 2000-11-07 | Taisei Corp | Construction method of soil cement diaphragm wall |
| CN106223381A (en) * | 2016-08-31 | 2016-12-14 | 徐州徐工基础工程机械有限公司 | A kind of dual-use type construction of diaphragm wall equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942310A (en) * | 2021-01-26 | 2021-06-11 | 上海兴庚基础工程有限公司 | Construction process of equal-thickness cement-soil stirring continuous wall |
| CN113529720A (en) * | 2021-07-06 | 2021-10-22 | 上海市基础工程集团有限公司 | Wall forming and slurry parameter control method for milling equal-thickness cement-soil continuous steel wall on thick sand layer |
| CN113638422A (en) * | 2021-09-04 | 2021-11-12 | 浙江艮威水利建设有限公司 | Deep foundation pit construction method |
| CN114753348A (en) * | 2022-05-20 | 2022-07-15 | 上海隧道工程有限公司 | Construction method of complex stratum ultra-deep ultra-thick underground diaphragm wall |
| CN116104155A (en) * | 2023-04-12 | 2023-05-12 | 广东水电二局股份有限公司 | Quick grooving method for ultra-deep underground diaphragm wall of soft soil stratum |
| CN116104155B (en) * | 2023-04-12 | 2023-09-26 | 广东水电二局股份有限公司 | Quick grooving method for ultra-deep underground diaphragm wall of soft soil stratum |
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