CN110952527A - Construction method of ultra-deep cement-soil continuous wall - Google Patents
Construction method of ultra-deep cement-soil continuous wall Download PDFInfo
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- CN110952527A CN110952527A CN201811121802.2A CN201811121802A CN110952527A CN 110952527 A CN110952527 A CN 110952527A CN 201811121802 A CN201811121802 A CN 201811121802A CN 110952527 A CN110952527 A CN 110952527A
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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
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- 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
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- 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
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- 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)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Structural 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 an ultra-deep cement-soil continuous wall, which aims to solve the problem that the construction depth of the existing guide rod type double-wheel milling equipment is not enough; the TRD construction method has the problems of difficult cutting, slow construction progress, large equipment abrasion and the like in a dense hard stratum with a thicker stratum and higher strength. The method comprises the following specific steps: exploring geological conditions and exploring the soil property characteristics in the depth range; conducting guide rod type double-wheel milling deep stirring cutting construction; the construction method of the ultra-deep cement-soil continuous wall 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 an ultra-deep cement-soil continuous wall.
Background
The TRD construction method is developed and researched in the early 90 s of Japan, and is complete equipment and a construction method capable of continuously forming walls in various soil 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 is difficult to cut, slow in construction progress, and even impossible to construct in a dense hard stratum with a thick stratum and high strength.
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.
However, the maximum construction depth of the guide rod type double-wheel milling equipment is 48.5 meters, and the guide rod type double-wheel milling equipment cannot be applied to construction of ultra-deep cement-soil continuous walls with the depth exceeding 48.5 meters.
At present, guide rod type double-wheel milling equipment or TRD equipment is generally used for independent operation according to specific geological conditions in the construction of the cement-soil 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 an ultra-deep cement continuous wall, which adopts a processing mode of combining a double-wheel milling deep stirring method with a TRD method, namely, a guide rod type double-wheel milling device pre-cutting groove is adopted, the cutting depth is 48.5 meters, the construction verticality can reach 3 thousandths, then the TRD device is used for cutting to the design depth and stirring and grouting are carried out, so that the cement continuous wall is formed, and the problem that the construction depth of the existing guide rod type double-wheel milling device is not enough is solved; the TRD construction method has the problems that in a dense hard stratum with a thick stratum and high strength, the cutting is difficult, the construction progress is slow, the equipment abrasion is large, the cutting quality cannot be guaranteed, and the like.
The invention is realized in this way, a construction method of ultra-deep cement-soil continuous wall, comprising the following steps:
step one, exploring geological conditions and exploring the soil property characteristics in the depth range;
secondly, conducting guide rod type double-wheel milling deep stirring cutting construction;
and step three, carrying out TRD cement soil continuous wall construction.
Furthermore, the depth of the ultra-deep cement-soil continuous wall is not less than 48.5 meters, and high requirements are made on the grooving construction quality and the wall protection slurry quality control.
Furthermore, the thickness of the silt layer in the construction depth range is large, the standard penetration number is large, the construction progress of the TRD cement-soil continuous wall is severely restricted, the later construction of the diaphragm wall and a pile foundation is influenced, and the whole construction period is further influenced;
in the second step, guide rod type double-wheel milling deep stirring cutting construction is carried out, in-situ soil is cut and stirred by rotating 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-proofing wall and a retaining wall or used for reinforcing and improving the stratum;
the step three 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.
According to the invention, guide rod type double-wheel milling equipment with strong cutting performance is preferentially selected for cutting, and TRD cement-soil continuous wall construction is carried out at the rear side of the guide rod type double-wheel milling equipment. The construction method of the ultra-deep cement-soil continuous wall provided by the invention is characterized in that guide rod type double-wheel milling equipment and TRD equipment are arranged and constructed simultaneously along the same direction, so that equipment loss caused by long-time operation of single equipment in a hard stratum in the traditional construction method is avoided. The respective advantages of the equipment are fully utilized: the guide rod type double-wheel milling equipment has strong cutting performance; the TRD equipment has the advantages of large construction depth range, continuous wall formation, smooth surface, consistent thickness and good wall uniformity. The construction difficulty of the cement-soil continuous wall is reduced, the cutting time is effectively saved, the construction quality and the construction efficiency are improved, and the construction cost is saved.
Drawings
FIG. 1 is a flow chart of the construction method of the ultra-deep cemented soil continuous wall in the embodiment of the invention.
FIG. 2 is a construction state diagram of the construction method of the ultra-deep cemented soil continuous wall in the embodiment of the invention.
FIG. 3 is a construction state diagram of a lower cutting box in the construction method of the ultra-deep cemented soil continuous wall in the embodiment of the invention.
FIG. 4 is a forward cutting construction state diagram of TRD equipment in the construction method of the ultra-deep cemented soil continuous wall in the embodiment of the invention.
Fig. 5 is a drawing illustrating a construction state of a TRD apparatus in the ultra-deep cemented soil continuous wall construction method according to the embodiment of the present invention by return cutting.
FIG. 6 is a diagram of the construction state of the ultra-deep cemented soil continuous wall through stirring and curing by the TRD equipment in the construction method of the ultra-deep cemented soil continuous wall in the embodiment of the invention.
Illustration of the drawings:
1-constructing a stratum; 2-guide rod type double-wheel milling equipment; a 3-TRD device; 4-cement soil underground continuous wall body; 5-pre-embedding holes; 6-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 construction method of the ultra-deep cement-soil continuous wall is particularly applied to the construction of extension projects in a certain hospital, the construction area is relatively narrow, and the surrounding environment is complex. The project adopts a TRD cement soil continuous wall as a foundation pit waterproof curtain, the depth is 55.5 meters along the length 413.9 meters of the foundation pit, the effective wall depth is 54 meters, and the wall thickness is 0.7 meter.
The flow of the construction method of the ultra-deep cement-soil continuous wall is shown in fig. 1, and the construction method specifically comprises the following steps:
(1) geological conditions are explored, and the thickness of the silt layer in the depth range of the construction stratum 1 is large through investigation, the standard penetration number is large, the construction progress of the TRD cement-soil continuous wall is severely restricted, the later construction of the diaphragm wall and the pile foundation is influenced, and the whole construction period is further influenced.
(2) The depth of the slurry is cut to 48.5 meters by the guide rod type double-wheel milling equipment 2, 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 TRD equipment 3 host computer takes one's place in the grooving position in advance, and the corresponding construction position need lay the steel sheet in order to satisfy the construction requirement.
(4) And (5) hoisting the embedded box. And excavating an embedded hole 5 with the depth of about 3m, the length of about 2m and the width of about 1m by using an excavator, lowering the embedded box, and then putting the cutting box 6 into the embedded box section by section.
(5) The cutting box 6 is connected with the TRD device 3 host. At first, the TRD equipment 3 host computer moves to the pre-buried cave 5 position and connects the cutting case 6, then the TRD equipment 3 host computer returns to predetermined construction position again and carries out vertical cutting, so relapse until meeting design depth requirement.
(6) 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.
(7) And (4) cutting in a return stroke. And injecting cutting fluid to perform secondary cutting on the soil body.
(8) Stirring and curing to form the wall. Grouting consolidation slurry such as cement paste and the like, and fully stirring the grout and the in-situ soil to form the cement soil underground continuous wall 4 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. The construction method of the ultra-deep cement-soil continuous wall is characterized by comprising the following steps:
step one, exploring geological conditions and exploring the soil property characteristics in the depth range;
secondly, conducting guide rod type double-wheel milling deep stirring cutting construction;
and step three, carrying out TRD cement soil continuous wall construction.
2. The construction method of the ultra-deep cemented soil continuous wall as claimed in claim 1, wherein the depth of the ultra-deep cemented soil continuous wall is not less than 48.5 m, which has high requirements on the grooving construction quality and the wall protection slurry quality control.
3. The construction method of the ultra-deep cement-soil continuous wall according to claim 1, characterized in that the thickness of the silt layer in the construction depth range is large, the penetration number is large, the construction progress of the TRD cement-soil continuous wall is severely restricted, the construction of the diaphragm wall and the pile foundation in the later period is influenced, and the whole construction period is further influenced;
in the second step, guide rod type double-wheel milling deep stirring cutting construction is carried out, in-situ soil is cut and stirred by rotating 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-proofing wall and a retaining wall or used for reinforcing and improving the stratum;
the step three 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121802.2A CN110952527A (en) | 2018-09-26 | 2018-09-26 | Construction method of ultra-deep cement-soil continuous wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121802.2A CN110952527A (en) | 2018-09-26 | 2018-09-26 | Construction method of ultra-deep cement-soil continuous wall |
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| CN110952527A true CN110952527A (en) | 2020-04-03 |
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| CN201811121802.2A Withdrawn CN110952527A (en) | 2018-09-26 | 2018-09-26 | Construction method of ultra-deep cement-soil continuous wall |
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Cited By (1)
| 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 |
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| JP2004263529A (en) * | 2003-03-03 | 2004-09-24 | Sanwa Kizai Co Ltd | Excavation-direction underground sectional inverted t-shaped and l-shaped continuous wall work execution machine |
| CN101761083A (en) * | 2008-12-24 | 2010-06-30 | 上海市基础工程公司 | Underground continuous wall obstacle clearing construction method for traversing ultra-thick obstacle |
| CN103938617A (en) * | 2014-05-21 | 2014-07-23 | 中鼎国际工程有限责任公司 | Super-deep underground continuous wall and construction method thereof |
| CN105887905A (en) * | 2016-04-21 | 2016-08-24 | 中亿丰建设集团股份有限公司 | Construction method for milling cement soil stirring wall waterproof curtain through double wheels |
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2018
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Patent Citations (6)
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| JP2004263529A (en) * | 2003-03-03 | 2004-09-24 | Sanwa Kizai Co Ltd | Excavation-direction underground sectional inverted t-shaped and l-shaped continuous wall work execution machine |
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| CN103938617A (en) * | 2014-05-21 | 2014-07-23 | 中鼎国际工程有限责任公司 | Super-deep underground continuous wall and construction method thereof |
| CN105887905A (en) * | 2016-04-21 | 2016-08-24 | 中亿丰建设集团股份有限公司 | Construction method for milling cement soil stirring wall waterproof curtain through double wheels |
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Non-Patent Citations (4)
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| 冯春强: "TRD工法在超深基坑工程中的应用 ", 《建筑施工》 * |
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Cited By (1)
| 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 |
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Application publication date: 20200403 |