CN112681284A - Coral sand foundation treatment method - Google Patents
Coral sand foundation treatment method Download PDFInfo
- Publication number
- CN112681284A CN112681284A CN202110085124.4A CN202110085124A CN112681284A CN 112681284 A CN112681284 A CN 112681284A CN 202110085124 A CN202110085124 A CN 202110085124A CN 112681284 A CN112681284 A CN 112681284A
- Authority
- CN
- China
- Prior art keywords
- coral sand
- sand foundation
- treatment method
- parts
- special mortar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a coral sand foundation treatment method, which comprises the steps of treatment of mixing piles and treatment of soil among piles, and integrally improves the bearing capacity of the coral sand foundation by pointing and surfacing, and provides special mortar for the coral sand foundation. The method has the advantages of simple construction process, high construction speed, less required equipment, effective improvement of the bearing capacity of the coral sand foundation, local material utilization, less consumption of the modifier, marine transportation cost saving and positive effect on treatment of large-area coral sand filled foundations.
Description
Technical Field
The invention belongs to the technical field of coral sand foundation reinforcement, and particularly relates to a coral sand foundation treatment method.
Background
In recent years, with the vigorous development and utilization of marine resources, more and more sea reclamation projects have appeared. As the distance from the land is far, the foundation filled by adopting the land high-quality soil is easily restricted by sea conditions and transportation distances. The method is an effective way for solving the problem by using local materials and effectively utilizing coral sand, coral clastic soil and calcareous soil which are widely distributed in ocean areas to fill the foundation. The coral sand is special soil with high calcium carbonate content, is mainly formed by piling coral, shellfish and other marine biological debris under the action of sea, has the characteristics of loose particles, high porosity, easy breaking and the like, and has special engineering properties, so that the coral sand foundation is not suitable for being treated by using methods of dynamic compaction, vibroflotation and the like. In view of the above reasons, the invention provides a coral sand foundation treatment method with high bearing capacity and high construction speed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a coral sand foundation treatment method, which effectively improves the bearing capacity of the coral sand foundation, has simple and rapid construction, needs less equipment, uses local materials and saves the foundation treatment cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a coral sand foundation treatment method comprises the following steps:
firstly, preparing on site, paying off, and determining pile positions of the mixing piles according to the pre-design, wherein the pile positions are arranged in a quincunx shape;
secondly, the stirrer is put in place, a drill rod is adjusted, special mortar is prepared at the same time, and the prepared special mortar is poured into a hopper;
step three, the stirrer starts to operate, the stirring drill bit vertically rotates downwards to drill, and simultaneously a slurry feeding pump is started to cut soil and spray slurry until the designed depth is reached;
step four, after the designed depth is reached, the drill bit does not drill downwards any more, but the rotation and continuous guniting are always kept, so that the special mortar is fully mixed with the coral sand foundation soil;
step five, reversely rotating the lifting drill rod, and continuously spraying the special mortar into the coral sand foundation by the slurry feeding pump;
step six, repeating the step three to the step five, and repeatedly stirring and spraying for 1-3 times for each pile position to finish the construction of the single coral sand foundation stirring pile;
step seven, starting the construction of the next pile position, and repeating the step two to the step six until the construction of all the mixing piles is completed;
pouring seawater into the hopper, starting a slurry feeding pump, and flushing a slurry spraying pipeline;
and step nine, after the hopper is washed, pouring a low-concentration modifier into the hopper, continuously using a stirrer to treat soil between the piles, wherein the treatment mode is the same as the step three to the step five, but the low-concentration modifier is sprayed into the coral sand foundation instead of special mortar, the treatment thickness is 1/8-1/5 of the designed depth of the stirring pile, and finally, the treatment of the coral sand foundation is completed.
In a further improvement, the drilling speed and the lifting speed of the stirrer are controlled to be 0.3-0.6 m/min.
The special mortar comprises the following components in parts by weight: 50-70 parts of Portland cement; 30-40% of mineral admixture; 160-205 parts of coral sand; modifying agent: 1-3 parts; sea water: 80-120 parts.
In a further improvement, the mineral admixture is formed by mixing silica fume and mineral powder according to the mass ratio of 1: 4.
The coral sand is obtained by screening coral sand foundation soil, and the screening aperture range is 1-8 mm.
In a further improvement, the modifier is a graphene oxide solution.
The invention has the technical effects that: the construction process is simple, the construction speed is high, required equipment is less, the bearing capacity of the coral sand foundation is effectively improved, local materials are used, the using amount of the modifier is less, the sea transportation cost is saved, and the treatment of the large-area coral sand filled foundation has a positive effect.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the following examples, which are intended to be illustrative of the present invention and should not be construed as limiting the scope of the invention. The examples do not show the specific conditions, and the general conditions or the conditions recommended by the manufacturer are followed. The reagents or instruments used are not indicated by the manufacturer, and are conventional products available commercially.
Example 1
A coral sand foundation treatment method comprises the following steps:
firstly, preparing on site, paying off, and determining pile positions of the mixing piles according to the pre-design, wherein the pile positions are arranged in a quincunx shape;
secondly, the stirrer is put in place, a drill rod is adjusted, special mortar is prepared at the same time, and the prepared special mortar is poured into a hopper;
step three, the stirrer starts to operate, the stirring drill bit vertically rotates downwards to drill, and simultaneously a slurry feeding pump is started to cut soil and spray slurry until the designed depth is reached;
step four, after the designed depth is reached, the drill bit does not drill downwards any more, but the rotation and continuous guniting are always kept, so that the special mortar is fully mixed with the coral sand foundation soil;
step five, reversely rotating the lifting drill rod, and continuously spraying the special mortar into the coral sand foundation by the slurry feeding pump;
step six, repeating the step three to the step five, and repeatedly stirring and spraying for 1-3 times for each pile position to finish the construction of the single coral sand foundation stirring pile;
step seven, starting the construction of the next pile position, and repeating the step two to the step six until the construction of all the mixing piles is completed;
pouring seawater into the hopper, starting a slurry feeding pump, and flushing a slurry spraying pipeline;
and step nine, after the hopper is washed, pouring a low-concentration modifier into the hopper, continuously using a stirrer to treat soil between the piles, wherein the treatment mode is the same as the step three to the step five, but the low-concentration modifier is sprayed into the coral sand foundation instead of special mortar, the treatment thickness is 1/8-1/5 of the designed depth of the stirring pile, and finally, the treatment of the coral sand foundation is completed.
In this example, the drilling and lifting speeds of the blender were controlled at 0.4 m/min.
In this embodiment, the special mortar comprises the following components in parts by weight: 50 parts of Portland cement; a mineral admixture 30; 165 parts of coral sand; modifying agent: 2 parts of (1); sea water: and 90 parts.
In this embodiment, the mineral admixture is formed by mixing silica fume and mineral powder in a mass ratio of 1: 4.
In this embodiment, coral sand is sieved from coral sand foundation soil, and the sieving aperture range is 1-8 mm.
In this embodiment, the modifier is a graphene oxide solution.
Example 2
The difference from example 1 is that: the special mortar comprises the following components in parts by weight: 55 parts of Portland cement; a mineral admixture 35; 175 parts of coral sand; modifying agent: 2 parts of (1); sea water: 100 parts.
Example 3
The difference from example 1 is that: the special mortar comprises the following components in parts by weight: 70 parts of Portland cement; a mineral admixture 40; 180 parts of coral sand; modifying agent: 3 parts of a mixture; sea water: 110 portions.
Claims (6)
1. A coral sand foundation treatment method is characterized by comprising the following steps:
firstly, preparing on site, paying off, and determining pile positions of the mixing piles according to the pre-design, wherein the pile positions are arranged in a quincunx shape;
secondly, the stirrer is put in place, a drill rod is adjusted, special mortar is prepared at the same time, and the prepared special mortar is poured into a hopper;
step three, the stirrer starts to operate, the stirring drill bit vertically rotates downwards to drill, and simultaneously a slurry feeding pump is started to cut soil and spray slurry until the designed depth is reached;
step four, after the designed depth is reached, the drill bit does not drill downwards any more, but the rotation and continuous guniting are always kept, so that the special mortar is fully mixed with the coral sand foundation soil;
step five, reversely rotating the lifting drill rod, and continuously spraying the special mortar into the coral sand foundation by the slurry feeding pump;
step six, repeating the step three to the step five, and repeatedly stirring and spraying for 1-3 times for each pile position to finish the construction of the single coral sand foundation stirring pile;
step seven, starting the construction of the next pile position, and repeating the step two to the step six until the construction of all the mixing piles is completed;
pouring seawater into the hopper, starting a slurry feeding pump, and flushing a slurry spraying pipeline;
and step nine, after the hopper is washed, pouring a low-concentration modifier into the hopper, continuously using a stirrer to treat soil between the piles, wherein the treatment mode is the same as the step three to the step five, but the low-concentration modifier is sprayed into the coral sand foundation instead of special mortar, the treatment thickness is 1/8-1/5 of the designed depth of the stirring pile, and finally, the treatment of the coral sand foundation is completed.
2. The coral sand foundation treatment method according to claim 1, wherein the drilling and lifting speed of the stirrer is controlled to be 0.3 to 0.6 m/min.
3. The coral sand foundation treatment method according to claim 1, wherein the special mortar comprises the following components in parts by weight: 50-70 parts of Portland cement; 30-40% of mineral admixture; 160-205 parts of coral sand; modifying agent: 1-3 parts; sea water: 80-120 parts.
4. The coral sand foundation treatment method as claimed in claim 3, wherein the mineral admixture is formed by mixing silica fume and mineral powder according to a mass ratio of 1: 4.
5. The coral sand foundation treatment method as claimed in claim 3, wherein the coral sand is sieved from coral sand foundation soil, and the sieving pore size is in the range of 1-8 mm.
6. The coral sand foundation treatment method according to claim 1 or 3, wherein the modifier is a graphene oxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110085124.4A CN112681284A (en) | 2021-01-22 | 2021-01-22 | Coral sand foundation treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110085124.4A CN112681284A (en) | 2021-01-22 | 2021-01-22 | Coral sand foundation treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112681284A true CN112681284A (en) | 2021-04-20 |
Family
ID=75458907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110085124.4A Pending CN112681284A (en) | 2021-01-22 | 2021-01-22 | Coral sand foundation treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112681284A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003235927A (en) * | 2002-02-19 | 2003-08-26 | Icc Kk | Coral bath for generating minus ion by use of weathered coral and weathered coral sand application agent for coral bath |
| JP2007077679A (en) * | 2005-09-14 | 2007-03-29 | Mhi Solution Technologies Co Ltd | Reinforcing method of coastal ground and coastal structure |
| CN106638543A (en) * | 2016-12-16 | 2017-05-10 | 海南大学 | Coral sand solidification method |
| JP2017186811A (en) * | 2016-04-07 | 2017-10-12 | 国立大学法人 東京大学 | Sand gravel solidification body forming method and land area preservation method |
| CN109081655A (en) * | 2018-10-08 | 2018-12-25 | 南京市公共工程建设中心 | A kind of bridge coarse aggregate Reactive Powder Concrete and preparation method thereof |
| CN109811760A (en) * | 2019-01-31 | 2019-05-28 | 山东科技大学 | A kind of method that high polymer PFA reinforces South Sea coral sand ground |
-
2021
- 2021-01-22 CN CN202110085124.4A patent/CN112681284A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003235927A (en) * | 2002-02-19 | 2003-08-26 | Icc Kk | Coral bath for generating minus ion by use of weathered coral and weathered coral sand application agent for coral bath |
| JP2007077679A (en) * | 2005-09-14 | 2007-03-29 | Mhi Solution Technologies Co Ltd | Reinforcing method of coastal ground and coastal structure |
| JP2017186811A (en) * | 2016-04-07 | 2017-10-12 | 国立大学法人 東京大学 | Sand gravel solidification body forming method and land area preservation method |
| CN106638543A (en) * | 2016-12-16 | 2017-05-10 | 海南大学 | Coral sand solidification method |
| CN109081655A (en) * | 2018-10-08 | 2018-12-25 | 南京市公共工程建设中心 | A kind of bridge coarse aggregate Reactive Powder Concrete and preparation method thereof |
| CN109811760A (en) * | 2019-01-31 | 2019-05-28 | 山东科技大学 | A kind of method that high polymer PFA reinforces South Sea coral sand ground |
Non-Patent Citations (1)
| Title |
|---|
| 卿三惠: "《土木工程施工工艺 路基路面工程 第2版》", 31 October 2013 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105541138B (en) | A kind of geopolymer for handling brining ground foundation and preparation method and application | |
| CN104844129B (en) | A kind of modification thixotropic slurry and compound method thereof | |
| CN101581093B (en) | Composite high performance soil cement mortar pile construction method | |
| WO2005095300A1 (en) | Concrete composition, process for producing the same, method of regulating viscosity, and method of constructing cast-in-place concrete pile from the concrete composition | |
| CN101591914A (en) | A kind of job practices of using the foundation pit supporting construction of castinplace pile and agitation pile interlock | |
| CN102155012A (en) | Foundation reinforcing construction method employing powder high-pressure injection grouting | |
| CN101250872A (en) | Flabbiness ground strengthened cement mortar stirring pile and pile-formation method thereof | |
| CN109456006A (en) | A kind of self-compacting concrete and its application using waste preparation | |
| CN103265239A (en) | Method for preparing sludge concrete | |
| KR100884285B1 (en) | The soil stabilization for which this for super-high-pressure injection and this were used with hardening agent for soft soil stabilization | |
| CN109797741A (en) | A kind of carbonization mixing pile composite foundation and its construction method | |
| CN101255693A (en) | Ground strengthening cement mortar rotary-spraying pile and construction method | |
| JPH0581632B2 (en) | ||
| CN102677662A (en) | Construction method of cement-mixed pile for treating coastal soft soil foundation | |
| CN112900447A (en) | Construction method for milling deep-layer stirring curing waterproof curtain and combining with rotary digging pile | |
| CN112681284A (en) | Coral sand foundation treatment method | |
| CN115583817B (en) | Method and composition for organic-inorganic hybrid consolidation of seabed sludge | |
| CN110143782B (en) | South sea calcareous sand high polymer reinforced soil and preparation method thereof | |
| KR100942714B1 (en) | The soil improvement method for which high-pressure injection agiator and this were used | |
| CN101487251A (en) | Construction method of premixing pouring soil cement pile used for strengthening ground and pile produced thereby | |
| CN113045252B (en) | Environment-friendly wall protection slurry for underground continuous wall and preparation method thereof | |
| KR100272950B1 (en) | Method of forming water-resist wall of rubbish buried place | |
| CN114775646A (en) | Method for slope curing and protection by using solidified soil prepared from lake and reservoir sediment | |
| US20070142506A1 (en) | Additive used for treating clay/salt in situ materials in order to turn them into aggregates for cement mortar and cement concrete | |
| CN106365542A (en) | Sulfate-resistant concrete and construction method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210420 |
|
| WD01 | Invention patent application deemed withdrawn after publication |