CN113174983A - Construction method of pebble stratum waterproof curtain - Google Patents
Construction method of pebble stratum waterproof curtain Download PDFInfo
- Publication number
- CN113174983A CN113174983A CN202110430961.6A CN202110430961A CN113174983A CN 113174983 A CN113174983 A CN 113174983A CN 202110430961 A CN202110430961 A CN 202110430961A CN 113174983 A CN113174983 A CN 113174983A
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- construction
- soil
- pebble
- waterproof curtain
- grooving
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- 238000010276 construction Methods 0.000 title claims abstract description 57
- 239000002689 soil Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
Abstract
The invention provides a construction method of a pebble stratum waterproof curtain, which comprises the following steps: s1: exploring the geological condition, exploring the soil property characteristics in the depth range, and determining whether a gravel pebble layer with larger thickness exists; s2: carrying out grooving construction by using a grab type grooving machine; s3: filling plain soil in the groove; s4: and stirring and grouting into a wall by using the triaxial stirring pile machine. The method adopts multi-equipment parallel construction, fully utilizes respective advantages of the equipment, reduces machine abrasion, reduces construction difficulty, effectively shortens construction period, improves construction efficiency and construction quality, and saves cost.
Description
Technical Field
The invention relates to the technical field of foundation construction, in particular to a construction method of a pebble stratum waterproof curtain.
Background
At present, a waterproof curtain, namely a cement continuous wall, is constructed by using a three-axis mixing pile machine or TRD equipment to independently operate according to specific geological conditions. The construction of the triaxial mixing pile machine is to adopt the mixing pile machine to spray reinforcing materials such as cement into soil and fully mix, and the cement and the soil generate a series of physical and chemical reactions, so that the soil is hardened to improve the strength of a foundation and generate a water stop effect, thereby forming a water stop curtain and controlling the permeability of bottom water. However, when a stratum with high local strength, especially a gravel pebble stratum, is encountered in the construction process of the three-shaft mixing pile machine, the construction of the three-shaft mixing pile machine has the problems of difficult drilling and difficult pile forming, and has serious influence on the construction progress and the construction quality.
The TRD construction method, also known as equal-thickness cement soil underground continuous wall construction method, is a complete set of equipment and 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 layer 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 which plays a role in consolidation is poured, and a wall with a certain thickness is formed. Its advantages are continuous wall, high uniformity and high cost.
In addition, the grab bucket type trenching machine commonly used in construction is suitable for the stratums such as cohesive soil, silt, sandy soil, gravel and pebbles, has more obvious advantages particularly in the pebble stratum, has high construction speed and small mechanical abrasion, and is widely applied to the construction of diaphragm walls, impervious walls and the like. But the grab bucket type trenching machine does not have the function of guniting.
In conclusion, the construction operation of the cement-soil continuous wall often causes large equipment consumption, high manufacturing cost or no construction at all due to continuous construction of single equipment. When the construction condition of complex geology is faced, the maximum advantage of equipment can not be exerted, so that the problem of slow construction progress is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the construction method of the pebble stratum waterproof curtain, which adopts the parallel construction of multiple devices, fully utilizes the respective advantages of the devices, reduces the abrasion of a machine, reduces the construction difficulty, effectively shortens the construction period, improves the construction efficiency and the construction quality and saves the cost.
In order to achieve the purpose, the construction method of the pebble stratum waterproof curtain comprises the following steps:
s1: exploring the geological condition, exploring the soil property characteristics in the depth range, and determining whether a gravel pebble layer with larger thickness exists;
s2: carrying out grooving construction by using a grab type grooving machine;
s3: filling plain soil in the groove;
s4: stirring and grouting wall forming of triaxial mixing pile machine
Further, in step S2, the grooving depth is not more than 35m, the mud specific gravity is not more than 1.3, and a hole collapse measure is made during the grooving process.
Further, in step S3, after completing forming the trench, the trench is filled with plain soil to a designed elevation.
And further, replacing the plain soil by sections.
Further, in step S4, after the drill rod of the triaxial mixing pile driver is stirred from the ground to the designed depth, the cement slurry is sprayed while the drill rod of the triaxial mixing pile driver is lifted at a uniform speed.
Further, after primary stirring, soil in the groove is subjected to secondary stirring, and cement soil is fully stirred to form the uniform cement soil continuous wall.
Further, in step S2, the grooving width is not less than 0.6 m.
According to the method for constructing the pebble stratum waterproof curtain, the grab type trenching machine and the triaxial mixing pile machine are arranged in the same direction for construction, and the respective advantages of the devices are fully utilized. The grab bucket type trenching machine has high trenching speed in a pebble stratum, small mechanical abrasion, high construction speed of the triaxial mixing pile machine in a soft soil stratum, uniform mixing, continuous cement soil wall forming, reduction of the construction difficulty of the cement soil continuous wall, effective saving of the time for pore forming, mixing and grouting, improvement of the construction efficiency and the construction quality and cost saving. And the problems that a geological soil layer is difficult to drill and cut, the construction progress is slow, the mechanical abrasion is large, the grouting speed is slow and the like are solved.
Drawings
The present invention will be further described and illustrated with reference to the following drawings.
Fig. 1 is a flowchart of a construction method of a waterproof curtain for a pebble formation according to a preferred embodiment of the invention.
Detailed Description
The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a method for constructing a waterproof curtain for a pebble formation according to a preferred embodiment of the present invention includes the following steps:
s1: exploring the geological condition, exploring the soil property characteristics in the depth range, and determining whether a gravel pebble layer with larger thickness exists; if a gravel and pebble layer with a large thickness exists, the process proceeds to step S2, a grab-type trenching machine is used for trenching construction, and if no gravel and pebble layer with a large thickness exists and the main soil layer is soft soil, silt and sandy soil, the process proceeds to step S4.
S2: and (3) carrying out grooving construction by using a grab type grooving machine, wherein the grooving speed is controlled in the grooving process, the grooving depth is not more than 35m, and the grooving width is not less than 0.6 m. The specific gravity of the slurry in the grooving process is not more than 1.3, and hole collapse measures are taken in the grooving process.
S3: and (4) replacing and filling plain soil in the groove, after the groove is formed, replacing and filling the plain soil in the groove to a designed elevation, wherein the plain soil replacement can be performed in a sectional replacement manner.
S4: and (3) stirring by a triaxial stirring pile machine, namely downwards stirring a drill rod of the triaxial stirring pile machine from the ground to a designed depth, lifting the drill rod of the triaxial stirring pile machine at a certain speed and simultaneously spraying cement slurry to perform grouting to form a wall. After primary stirring, re-stirring the soil in the groove, and fully stirring the cement soil to form the uniform cement soil continuous wall. The mixing pile machine sprays the cement into the soil body and fully mixes the cement to make the cement and the soil generate a series of physical and chemical reactions to form the cement-soil underground continuous wall body with the same thickness, and the permeability of the cement-soil continuous wall body is controlled by improving the soil property and the soil layer structure.
Specifically, this embodiment is a specific application in the construction of a certain scientific and industrial park, and the construction area is relatively narrow and small in the implementation environment, and the surrounding environment is complicated, and the soil layer is silt-sand-silt soil, silt clay, gravel sand, silt clay from top to bottom. The thicknesses of pebble, gravel and silt layers are large, the construction progress of the cement-soil continuous wall of the triaxial mixing pile machine is severely restricted, and the construction of later-stage supporting structure pile foundations, earthwork excavation and the like is influenced. The cement-soil continuous wall formed through construction has the advantages that the length of a foundation pit is 760m, the depth is 33m, the effective depth is 32m, and the wall thickness is 0.6 m.
According to the method for constructing the pebble stratum waterproof curtain, the grab type trenching machine and the triaxial mixing pile machine are arranged in the same direction for construction, and the respective advantages of the devices are fully utilized. The grab bucket type trenching machine has high trenching speed in a pebble stratum, small mechanical abrasion, high construction speed of the triaxial mixing pile machine in a soft soil stratum, uniform mixing, continuous cement soil wall forming, reduction of the construction difficulty of the cement soil continuous wall, effective saving of the time for pore forming, mixing and grouting, improvement of the construction efficiency and the construction quality and cost saving. And the problems that a geological soil layer is difficult to drill and cut, the construction progress is slow, the mechanical abrasion is large, the grouting speed is slow and the like are solved.
The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the invention. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The scope of the invention is defined by the claims.
Claims (7)
1. A construction method of a waterproof curtain of a pebble stratum is characterized by comprising the following steps:
s1: exploring the geological condition, exploring the soil property characteristics in the depth range, and determining whether a gravel pebble layer with larger thickness exists;
s2: carrying out grooving construction by using a grab type grooving machine;
s3: filling plain soil in the groove;
s4: and stirring and grouting into a wall by using the triaxial stirring pile machine.
2. The method of claim 1, wherein in step S2, a grooving depth is not more than 35m, a mud weight is not more than 1.3, and a hole collapse measure is performed during the grooving process.
3. The method of claim 1, wherein in step S3, after completing the forming of the groove, the groove is filled with plain soil to a designed elevation.
4. The method for constructing the pebble formation waterproof curtain as claimed in claim 3, wherein the filling-up plain soil is filled up by sections.
5. The method for constructing a waterproof curtain for a pebble formation according to claim 1, wherein in step S4, after the drill stem of the triaxial mixing pile driver is stirred downwards from the ground to a designed depth, the drill stem of the triaxial mixing pile driver is lifted up at a constant speed while cement slurry is sprayed.
6. The method for constructing the waterproof curtain of the pebble formation as claimed in claim 5, wherein after the initial stirring, the soil in the tank is stirred again to fully stir the cement soil, so as to form the uniform cement soil continuous wall.
7. The method of constructing a waterproof curtain for pebble ground according to claim 1, wherein in the step S2, the width of the groove is not less than 0.6 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110430961.6A CN113174983A (en) | 2021-04-21 | 2021-04-21 | Construction method of pebble stratum waterproof curtain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110430961.6A CN113174983A (en) | 2021-04-21 | 2021-04-21 | Construction method of pebble stratum waterproof curtain |
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| Publication Number | Publication Date |
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| CN113174983A true CN113174983A (en) | 2021-07-27 |
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| CN202110430961.6A Pending CN113174983A (en) | 2021-04-21 | 2021-04-21 | Construction method of pebble stratum waterproof curtain |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312445A (en) * | 2010-06-29 | 2012-01-11 | 中交第三航务工程勘察设计院有限公司 | Diaphragm wall and construction method thereof |
| CN111042249A (en) * | 2019-12-27 | 2020-04-21 | 上海建工四建集团有限公司 | Construction method of ultra-deep equal-thickness cement-soil mixing wall under complex geological condition |
| CN112502139A (en) * | 2020-11-25 | 2021-03-16 | 中铁八局集团有限公司 | Construction method for excavation of deep pit by three-axis stirring pile curtain water stop and rotary digging cast-in-place pile support |
-
2021
- 2021-04-21 CN CN202110430961.6A patent/CN113174983A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312445A (en) * | 2010-06-29 | 2012-01-11 | 中交第三航务工程勘察设计院有限公司 | Diaphragm wall and construction method thereof |
| CN111042249A (en) * | 2019-12-27 | 2020-04-21 | 上海建工四建集团有限公司 | Construction method of ultra-deep equal-thickness cement-soil mixing wall under complex geological condition |
| CN112502139A (en) * | 2020-11-25 | 2021-03-16 | 中铁八局集团有限公司 | Construction method for excavation of deep pit by three-axis stirring pile curtain water stop and rotary digging cast-in-place pile support |
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Application publication date: 20210727 |
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| RJ01 | Rejection of invention patent application after publication |