CN108589697B - Method for replacing filling soil in diaphragm wall construction area - Google Patents
Method for replacing filling soil in diaphragm wall construction area Download PDFInfo
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- CN108589697B CN108589697B CN201810436248.0A CN201810436248A CN108589697B CN 108589697 B CN108589697 B CN 108589697B CN 201810436248 A CN201810436248 A CN 201810436248A CN 108589697 B CN108589697 B CN 108589697B
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- Prior art keywords
- soil
- filling
- backfill
- diaphragm wall
- pit
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
Abstract
The embodiment of the invention provides a method for replacing miscellaneous fill in a diaphragm wall construction area, which comprises the following steps: measuring and setting out in a diaphragm wall construction area to determine a replacement area; excavating miscellaneous filling soil of the filling area to form a filling pit; and filling backfill soil in the filling and replacement pit to fill and replace the miscellaneous fill soil in the construction area. The method provided by the invention can improve the grooving effect of the diaphragm wall, protect the diaphragm wall reinforced concrete structure from being corroded, improve the diaphragm wall construction quality and provide safety guarantee for subsequent construction.
Description
Technical Field
The invention relates to the field of municipal engineering construction, in particular to a method for replacing and filling miscellaneous filling soil in a diaphragm wall construction area.
Background
The underground continuous reinforced concrete wall is built underground section by adopting a grooving machine on the ground in foundation engineering, excavating a long and narrow deep groove along the peripheral axis of the deep excavation engineering under the condition of slurry wall protection, hoisting a reinforcement cage in the groove after groove cleaning, and then pouring underwater concrete by using a conduit method to build a unit groove section. The diaphragm wall has the functions of water interception, seepage prevention, bearing and water retaining. Has important significance for subsequent construction.
When the soil body buried in the diaphragm wall construction area is miscellaneous filling soil, the miscellaneous filling soil mainly comprises soil, construction waste, household garbage, humus and other wastes, the miscellaneous filling soil is loose in structure and poor in uniformity, the soil body structure thicknesses of the diaphragm wall construction areas at different positions are different, and the diaphragm wall is easy to collapse when a groove is formed. Meanwhile, the miscellaneous filling soil contains a large amount of sulfate ions and carbonate ions, the sulfate ions and the carbonate ions react with water or combine with cement hydrate to generate crystals, so that the volume of a concrete structure can expand, cracks are generated in the concrete structure, the surface of the concrete structure is softened, the strength of the concrete is influenced, and the miscellaneous filling soil also contains chloride ions, so that the miscellaneous filling soil is corrosive to reinforcing steel bars, the construction quality of the diaphragm wall is poor, and the potential safety hazard is caused to later construction.
Disclosure of Invention
The invention provides a method for replacing and filling miscellaneous filling soil in a diaphragm wall construction area, which can improve the grooving effect of the diaphragm wall, protect a diaphragm wall reinforced concrete structure from being corroded, improve the construction quality of the diaphragm wall and provide safety guarantee for subsequent construction.
In order to achieve the purpose, the method for replacing the miscellaneous fill in the diaphragm wall construction area comprises the following steps: measuring and setting out in a diaphragm wall construction area to determine a replacement area; excavating miscellaneous filling soil of the filling area to form a filling pit; and filling backfill soil in the filling and replacement pit to fill and replace the miscellaneous fill soil in the construction area.
Preferably, the backfill soil is a mixture of cemented soil, silty clay and nitrite.
Preferably, the volume ratio of the cemented soil, the mealy clay and the nitrite is 99865: 900000: 135.
preferably, the filling back earth in the filling pit for filling the miscellaneous filling earth in the construction area comprises: dividing the replacement filled pits into a plurality of layers; and filling the backfill soil according to the layering.
Preferably, the method further comprises: and after each layer is filled with the backfill soil, rolling the backfill soil.
Preferably, the method further comprises: determining the water content of the backfill soil after the backfill soil is filled in the backfill pit; determining the water sprinkling amount according to the water content and the current weather condition; and sprinkling water to the backfilled soil according to the sprinkling amount.
Through the technical scheme provided by the invention, the invention at least has the following technical effects:
according to the method for replacing and filling the miscellaneous filling soil in the diaphragm wall construction area, the miscellaneous filling soil in the diaphragm wall construction area is dug out, the backfill soil is filled in the replacement filling pit, and the miscellaneous filling soil in the diaphragm wall construction area is replaced and filled, so that the grooving effect of the diaphragm wall can be improved, the reinforced concrete structure of the diaphragm wall is protected from corrosion, the diaphragm wall construction quality is improved, and safety guarantee is provided for subsequent construction.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a flowchart of a method for replacing miscellaneous fill in a diaphragm wall construction area according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, an embodiment of the present invention provides a construction method of a shallow tunnel underpass river, including the following steps: s101: measuring and setting out in a diaphragm wall construction area to determine a replacement area; s102: excavating miscellaneous filling soil of the filling area to form a filling pit; s103: and filling backfill soil in the filling and replacement pit to fill and replace the miscellaneous fill soil in the construction area.
In the embodiment of the invention, firstly, according to a design drawing, a lofting is measured on a construction site, a filling area is determined, and the filling area is excavated. When the self-dumping truck is used for excavating, an excavator is used for excavating in a backward running mode, and the miscellaneous filling soil in the replacement and filling area contains a large amount of corrosive mineral substances, so that the miscellaneous filling soil cannot be used for sieving and secondary utilization, the self-dumping truck needs to be transported while excavating, and the self-dumping truck is arranged on two sides of the excavator for loading and transporting earthwork. When in excavation, the pit is excavated from top to bottom and in layers, and the filling pit is changed according to the following steps of 1: and (5) slope descending at a gradient of 0.75, and filling the backfill soil into the filling pit after the complete excavation of the miscellaneous filling soil in the filling pit is completed.
By the method, the grooving effect of the diaphragm wall can be improved, the reinforced concrete structure of the diaphragm wall is protected from being corroded, the construction quality of the diaphragm wall is improved, and safety guarantee is provided for subsequent construction.
Preferably, the backfill soil is a mixture of cemented soil, silty clay and nitrite.
Because of the influence of the miscellaneous filling soil, the underground water in the diaphragm wall construction area contains carbonate ions, sulfate ions and chloride ions, after the common soil is adopted for replacement filling, the contents of the carbonate ions, the sulfate ions and the chloride ions in the underground water are still very high, the diaphragm wall has corrosivity to a reinforced concrete structure, and if the common soil is adopted for filling the replacement filling pit, the soil body of the common soil is easy to loosen, so that the problem of collapse of the diaphragm wall during excavation is easily caused. In the embodiment of the invention, the mixture of cement soil, silty clay and nitrite is used as the backfill soil. The backfill soil is a weak permeable layer, can effectively inhibit the diffusion of carbonate ions, sulfate ions and chloride ions, reduces the concentration of the carbonate ions, the sulfate ions and the chloride ions near the diaphragm wall, and simultaneously can react with ions in underground water as follows:
1. reaction of backfill with carbonate ions:
the main components of the cement soil are tricalcium silicate, dicalcium silicate and tricalcium aluminate, and hydration reaction can occur after the cement soil meets water to generate heat:
3CaO·SiO2+H2O→CaO·SiO2·YH2O+Ca(OH)2
2CaO·SiO2+H2O→CaO·SiO2·YH2O+Ca(OH)2
3CaO·Al2O3+6H2O→3CaO·Al2O3·6H2O
the carbonate ions in the underground water can generate decomposition reaction by heating:
CO3 2-+2H+→CO2+H2O
secondly, the cement soil contains calcium ions, and the calcium ions are combined with carbonate ions to generate calcium carbonate:
Ca2++CO3 2-→CaCO3
the calcium carbonate is a insoluble substance, can reduce the conductivity of the electrolyte environment and slow down the corrosion of the reinforced concrete.
2. Reaction of backfill with sulfate ions:
Ca2++SO4 2-→CaSO4
the cement soil contains calcium ions, the calcium ions and sulfate ions are combined to generate calcium sulfate, the calcium sulfate is insoluble, and the backfill soil can neutralize the sulfate ions in the underground water.
3. Reaction of the backfill with iron ions:
2Fe2++2OH-+2NO2-→2NO+γ-Fe2O3+H2O
the backfill soil contains nitrite which can react with the reinforcing steel bar to generate gamma-Fe2O3，γ-Fe2O3Attached to the surface of the steel bar to form a layer of passive film, and the chloride ions are isolated outside the passive film to protect the steel bar from being corroded.
The method of the embodiment of the invention can effectively solve the problems of corrosion of carbonate ions, sulfate ions and chloride ions in underground water to the reinforced concrete structure of the diaphragm wall and collapse of the diaphragm wall in a groove due to the miscellaneous fill, ensure the appearance and the internal quality of the diaphragm wall, improve the construction quality of the diaphragm wall and provide safety guarantee for subsequent construction.
Preferably, the volume ratio of the cemented soil, the mealy clay and the nitrite is 99865: 900000: 135.
in the embodiment of the invention, the volume ratio of the cement soil, the silty clay and the nitrite is 99865: 900000: 135, the backfill soil with the proportion can ensure the strength of the backfill soil on one hand, and can save cement and reduce the construction cost on the other hand.
Preferably, the filling back earth in the filling pit for filling the miscellaneous filling earth in the construction area comprises: dividing the replacement filled pits into a plurality of layers; and filling the backfill soil according to the layering.
In the embodiment of the invention, the operation is carried out by adopting a construction method of conveying materials and backfilling. Before backfilling, the required engineering amount is calculated according to the workload and the length of each day, transport vehicles are arranged, the silty clay is transported by adopting a large-scale dump truck in running water, and an excavator is adopted for backfilling. The filling pit is divided into a plurality of layers, and backfilled soil is laid according to the soil amount of each layer, and then mechanically leveled and leveled to prevent rainwater from accumulating so as to avoid influencing filling quality.
By the method, a large amount of subsidence and cracking of soil in the diaphragm wall construction area after backfilling can be avoided, the diaphragm wall construction quality is improved, and safety guarantee is provided for later construction.
Preferably, the method further comprises: and after each layer is filled with the backfill soil, rolling the backfill soil.
In the embodiment of the invention, for each layer, the backfill soil is rolled by a road roller after each layer of backfill soil is filled. The process of rolling the backfill soil by the road roller comprises the following steps: the backfilled soil is lightly pressed for 1-2 times by using a road roller, then the roller of the road roller is vibrated to roll the backfilled soil, the roller is pushed from two sides of the replacement pit to the middle during rolling, and the rolling channel of each rolling is overlapped with the rolling channel of the last rolling for 1/3 wheel widths. And (3) rolling each layer of backfill soil for 6-8 times by a road roller until no obvious wheel tracks exist. And (4) forbidding the vehicle to run on the uncompacted backfill soil so as to avoid uneven pit grooves on the backfill soil surface.
By the method, the soil body strength of the diaphragm wall construction area can be guaranteed, the groove collapse of the diaphragm wall is reduced, and the diaphragm wall construction quality is improved.
Preferably, the method further comprises: determining the water content of the backfill soil after the backfill soil is filled in the backfill pit; determining the water sprinkling amount according to the water content and the current weather condition; and sprinkling water to the backfilled soil according to the sprinkling amount.
In the embodiment of the invention, when the refilling pit is refilled, the water content of the backfilling soil is controlled, if the water content of the backfilling soil does not reach the design standard and the weather of the day is dry, the water sprinkling amount is determined according to the water content of the backfilling soil, and water is sprinkled to the backfilling soil according to the water sprinkling amount.
By the method, the strength of the backfill can reach the design strength, the backfill can be better bonded with the original soil, and safety guarantee is further provided for the diaphragm wall and later construction.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (4)
1. A method for replacing miscellaneous fill in a diaphragm wall construction area is characterized by comprising the following steps:
measuring and setting out in a diaphragm wall construction area to determine a replacement area;
excavating miscellaneous filling soil of the filling area to form a filling pit;
filling backfill in the backfill pit to perform backfill on the miscellaneous fill in the construction area, wherein the backfill is a mixture of cement soil, silty clay and nitrite, and the volume ratio of the cement soil to the silty clay to the nitrite is 99865: 900000: 135.
2. the method of claim 1, wherein the filling backfill in the backfill pit to backfill the miscellaneous fill in the construction area comprises:
dividing the replacement filled pits into a plurality of layers;
and filling the backfill soil according to the layering.
3. The method of claim 2, further comprising:
and after each layer is filled with the backfill soil, rolling the backfill soil.
4. The method according to any one of claims 1-3, further comprising:
determining the water content of the backfill soil after the backfill soil is filled in the backfill pit;
determining the water sprinkling amount according to the water content and the current weather condition;
and sprinkling water to the backfilled soil according to the sprinkling amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810436248.0A CN108589697B (en) | 2018-05-09 | 2018-05-09 | Method for replacing filling soil in diaphragm wall construction area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810436248.0A CN108589697B (en) | 2018-05-09 | 2018-05-09 | Method for replacing filling soil in diaphragm wall construction area |
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| Publication Number | Publication Date |
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| CN108589697A CN108589697A (en) | 2018-09-28 |
| CN108589697B true CN108589697B (en) | 2020-12-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0624682B2 (en) * | 1987-12-26 | 1994-04-06 | 株式会社日進製作所 | Super finishing machine using wrapping film |
| CN103061326A (en) * | 2013-01-25 | 2013-04-24 | 黑龙江省公路勘察设计院 | Construction method for reinforcing island-shaped permafrost roadbed through water stable gravel piles |
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