CN110820790B - Synchronous water injection humidifying construction process for lime-soil compaction pile - Google Patents
Synchronous water injection humidifying construction process for lime-soil compaction pile Download PDFInfo
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- CN110820790B CN110820790B CN201911149808.5A CN201911149808A CN110820790B CN 110820790 B CN110820790 B CN 110820790B CN 201911149808 A CN201911149808 A CN 201911149808A CN 110820790 B CN110820790 B CN 110820790B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
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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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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Abstract
The invention belongs to the technical field of foundation treatment, and particularly relates to a synchronous water injection humidifying construction process for a lime-soil compaction pile, which solves the technical problem in the background technology. The process mainly includes erecting a synchronous humidifying device at a position where pile driving is needed, wherein the synchronous humidifying device comprises an annular spraying pipe and a plurality of supporting legs connected below the annular spraying pipe, and a pipe body of the annular spraying pipe is connected with a water inlet pipe orifice and a plurality of water outlets; or a water injection pipe from top to bottom is arranged in the pile pipe of the pile driver to realize synchronous humidification. The synchronous water injection and humidification construction process for the lime-soil compaction pile can realize synchronous water injection and humidification and lime-soil compaction pile construction, the water injection amount can be controlled manually, water resources are saved, the effect of uniformly humidifying the surface layer and the deep layer of the pile hole is achieved, and the hole forming and compaction effect is good; the lime-soil compaction pile has the advantages of short working period of hole forming and water injection at the same time by changing the process, and achieves the breakthrough of doubling the treatment depth and can reach 30 m.
Description
Technical Field
The invention belongs to the technical field of foundation treatment, relates to a lime-soil compaction pile treatment technology, and particularly relates to a synchronous water injection humidifying construction process for a lime-soil compaction pile.
Background
Collapsible loess is unsaturated, less dense soil with low compressibility and high strength under natural humidity, but is soaked in water to cause great collapse deformation under the influence of additional pressure or dead weight pressure. Therefore, the soil must be treated to be used as the foundation of the building.
The lime-soil compaction pile is an effective and convenient method for treating the collapsible loess foundation. The principle is that the lateral extrusion effect when the pile driver forms the pile hole is utilized to compact the soil between the piles, and then the pile hole is compacted by plain soil or lime soil layer by layer. The pile pipe of the pile driver comprises a pile pipe body and a pile tip connected below the pile pipe body, wherein the pile pipe body and the pile tip are integrally formed. The depth of treatment of the traditional lime soil compaction pile is generally 5-15 m, but the traditional lime soil compaction pile is a process with larger treatment depth in various treatment methods of collapsible loess. If pore-forming in the loess that water content is lower, because the soil body is hard, the pore-forming is very difficult, and the water content is lower, is difficult for reaching maximum dry density, and is also not obvious to the crowded dense effect of soil body. Therefore, a pre-soaking method is adopted to obtain proper water content, and then the construction of the lime-soil compaction pile is carried out.
However, the traditional presoaking method has large water consumption and long construction period, and at least 5 tons of water are needed for treating 1 cubic meter of water. Generally, the time required for a site to be stable from pre-soaking to sinking and the water content of soil to reach a certain requirement is at least about one year, so that the construction period is prolonged to a great extent, and the construction cost is increased. Can not meet the requirement of short construction period of the current large amount of engineering construction for the return on investment period.
Disclosure of Invention
The present invention is directed to solving the technical problems of the background art. Therefore, the invention provides a synchronous water injection humidifying construction process for an ash soil compaction pile capable of treating large-thickness and low-water content collapsible loess.
The invention adopts a technical scheme for solving the technical problems that: a synchronous water injection and humidification construction process for a lime-soil compaction pile comprises the following steps:
firstly, determining the pile length and the point arrangement distance of a lime-soil pile according to the requirements of the depth of the wet subsidence and the bearing capacity of a foundation;
step two, obtaining the dry density of the soil body, the optimal water content and the average natural water content of the soil body through a soil test, and calculating the water adding amount of a single pile;
step three, erecting a synchronous humidifying device at a position where pile driving is needed, wherein the synchronous humidifying device comprises an annular spraying pipe and a plurality of supporting legs connected below the annular spraying pipe, a pipe body of the annular spraying pipe is connected with a water inlet pipe orifice and a plurality of water outlets, and the water outlets are arranged towards a perpendicular bisector of the annular spraying pipe; the water inlet pipe orifice is connected with an external water supply pipe, a water meter and a water pump in sequence;
step four, inserting the pile pipe of the pile driver into the middle of the annular spraying pipe for pore-forming construction, and synchronously injecting water according to the calculated water adding amount of the single pile in the step two while forming the pore until the designed pile length is reached;
step five, after the hole forming is finished, moving the synchronous humidifying device to the next piling position, and repeating the step three to the step four until the hole forming of all the pile holes is finished;
and step six, tamping the prepared lime soil into piles, detecting compaction degree according to requirements, detecting a composite foundation according to standard requirements, and finishing piling.
The other technical scheme adopted by the invention for solving the technical problem is as follows: a synchronous water injection and humidification construction process for a lime-soil compaction pile comprises the following steps:
firstly, determining the pile length and the point arrangement distance of a lime-soil pile according to the requirements of the depth of the wet subsidence and the bearing capacity of a foundation;
step two, obtaining the dry density of the soil body, the optimal water content and the average natural water content of the soil body through a soil test, and calculating the water adding amount of a single pile;
thirdly, arranging a water injection pipe in the pile pipe of the pile driver from top to bottom, wherein the top end of the water injection pipe extends out of the top of the pile pipe body and is fixedly connected with the top of the pile pipe body, a plurality of water outlet holes are formed in the connection part of the pile pipe body and the pile tip, and the bottom end of the water injection pipe is respectively connected with the water outlet holes; connecting the pipe orifice of a water injection pipe outside the pile pipe body with an external water supply pipe, a water meter and a water pump in sequence;
step four, placing the pile pipe of the pile driver at a position where pile driving is needed, and synchronously injecting water according to the calculated water adding amount of the single pile in the step two while forming the hole until the designed pile length is reached;
step five, after the hole forming is finished, moving the pile pipe added by the pile driver to the next position needing pile driving, and repeating the step three to the step four until the hole forming of all the pile holes is finished;
and step six, tamping the prepared lime soil into piles, detecting compaction degree according to requirements, detecting a composite foundation according to standard requirements, and finishing piling.
The invention has the beneficial effects that: the synchronous water injection humidifying construction process for the lime-soil compaction pile can realize synchronous water injection humidifying and lime-soil compaction pile construction on the collapsible loess with large thickness and low water content, the water injection amount can be controlled manually, the soil body is softened by adding water in the pore-forming process, the dry hardness of the lime-soil compaction pile in the collapsible loess with low water content is reduced, the phenomenon of pipe holding in the pore-forming process is eliminated, the water resource is saved, the uniform humidifying effect of the surface layer and the deep layer of the pile hole is achieved, and the pore-forming compacting effect is good; the lime-soil compaction pile has the advantages of short working period of hole forming and water injection at the same time by changing the process, thereby achieving the breakthrough of doubling the treatment depth, and the treatment depth can reach 30 m.
Drawings
FIG. 1 is a schematic view of the structure of the synchronous humidifying device of the present invention in cooperation with a pile pipe.
FIG. 2 is a schematic view of another construction process of synchronously injecting water and humidifying water for lime-soil compaction pile of the present invention, in which a water injection pipe is added.
In the figure: 1-a ring-shaped spray pipe; 2-a support leg; 3-water inlet pipe mouth; 4-pile pipe; 5-a water injection pipe; 6-pile pipe body; 7-pile tip; 8-water outlet.
Detailed Description
Referring to fig. 1 to 2, a construction process of synchronously injecting water and humidifying for an ash compaction pile according to the present invention will be described in detail.
A synchronous water injection and humidification construction process for a lime-soil compaction pile comprises the following steps:
firstly, determining the pile length and the point arrangement distance of a lime-soil pile according to the requirements of the depth of the wet subsidence and the bearing capacity of a foundation;
step two, obtaining the dry density of the soil body, the optimal water content and the average natural water content of the soil body through a soil test, and calculating the water adding amount of a single pile;
step three, erecting a synchronous humidifying device at a position where pile driving is needed, wherein the synchronous humidifying device comprises an annular spraying pipe 1 and a plurality of supporting legs connected below the annular spraying pipe 1, a water inlet pipe opening 3 and a plurality of water outlets are connected to the pipe body of the annular spraying pipe 1, the water outlets are arranged towards the perpendicular bisector of the annular spraying pipe 1, and specifically, the direction of the water outlets and the perpendicular bisector of the annular spraying pipe 1 form an angle of 45 degrees, so that water can flow downwards along a pile pipe 4 and permeate into deep soil along the punching progress;
step four, inserting the pile pipe 4 of the pile driver into the annular spray pipe 1 for pore-forming construction, and synchronously injecting water according to the calculated water addition amount of the single pile in the step two while pore-forming until the designed pile length is reached; the water inlet pipe mouth 3 is connected with an external water supply pipe, a water meter and a water pump in sequence; when the water is communicated, the water can flow down along the pile pipe 4 and flow down along the gap between the pile pipe 4 and the pile hole, so that the best wetting effect is achieved, and the construction period can be shortened to a great extent;
step five, after the hole forming is finished, moving the synchronous humidifying device to the next piling position, and repeating the steps three to four until the hole forming of all pile holes is finished;
and step six, tamping the prepared lime soil into piles, detecting compaction degree according to requirements, detecting a composite foundation according to standard requirements, and finishing piling.
Further, as a specific implementation mode of the synchronous water injection and humidification construction process for the lime-soil compacted pile, in the second step, the water adding amount of the single pile is equal to a loss coefficient obtained by multiplying a difference value between the optimal water content and the average natural water content by a single pile processing area by multiplying a lime-soil pile length by a dry density of a soil body by a water consumption.
Furthermore, as a specific implementation mode of the synchronous water injection and humidification construction process for the lime-soil compaction pile, the loss coefficient of water consumption is 1.02-1.05. The loss coefficient set by the specification is 1.05-1.1, and the water consumption is saved compared with large-area pre-soaking because the method is synchronously accurate to the soaking of each pile hole. According to the actual measurement statistics, the water consumption coefficient of the invention can be controlled to be 1.02-1.05.
Further, as a specific implementation manner of the synchronous water injection and humidification construction process for the lime-soil compaction pile, the stability of the synchronous humidification device is detected in the third step, and then the trial spraying is carried out after the water inlet pipe mouth 3 is connected with an external water supply pipe and a water meter.
Furthermore, as a specific implementation manner of the synchronous water injection and humidification construction process for the lime-soil compaction pile, in the third step, the depth of the support leg buried in the soil is not less than 30cm, and the height of the support leg above the ground is 15-25 cm. The supporting legs are buried in the soil to a depth of not less than 30cm and located above the ground to a height of 15-25 cm, so that the stability of the synchronous humidifying device is guaranteed and the side falling is prevented. But also can ensure that water can flow down along the pile pipe 4 as soon as possible.
Further, as a specific implementation manner of the synchronous water injection and humidification construction process for the lime-soil compaction pile, the water outlets are uniformly distributed on the pipe body of the annular spraying pipe 1 in the third step. The arrangement is to uniformly sprinkle water, improve the uniform humidifying effect of the surface layer and the deep layer and avoid the waste of water resources.
A synchronous water injection and humidification construction process for a lime-soil compaction pile comprises the following steps:
firstly, determining the pile length and the point arrangement distance of a lime-soil pile according to the requirements of the depth of the wet subsidence and the bearing capacity of a foundation;
step two, obtaining the dry density of the soil body, the optimal water content and the average natural water content of the soil body through a soil test, and calculating the water adding amount of a single pile;
thirdly, arranging a water injection pipe 5 from top to bottom in a pile pipe 4 of the pile driver, wherein the top end of the water injection pipe 5 extends out of the top of a pile pipe body 6 and is fixedly connected with the top of the pile pipe body 6, a plurality of water outlet holes 8 are formed in the connection part of the pile pipe body 6 and a pile tip 7, and the bottom end of the water injection pipe 5 is respectively connected with the water outlet holes 8; the pipe orifice of a water injection pipe 5 outside the pile pipe body 6 is connected with an external water supply pipe, a water meter and a water pump in sequence; after the water is communicated, the water can directly flow out of the water outlet hole 8 through the water injection pipe 5, and different soil depths are achieved along with the piling progress of the pile driver, so that the effects of punching and humidifying are achieved;
step four, placing the pile pipe 4 of the pile driver at a position where pile driving is needed, and synchronously injecting water according to the calculated water adding amount of the single pile in the step two while forming the hole until the designed pile length is reached;
step five, after the hole forming is finished, moving the pile pipe 4 added by the pile driver to the next position needing pile driving, and repeating the step three to the step four until the hole forming of all the pile holes is finished;
and step six, tamping the prepared lime soil into piles, detecting compaction degree according to requirements, detecting a composite foundation according to standard requirements, and finishing piling.
Further, as a specific implementation mode of the synchronous water injection and humidification construction process for the lime-soil compacted pile, in the second step, the water adding amount of the single pile is equal to a loss coefficient obtained by multiplying a difference value between the optimal water content and the average natural water content by a single pile processing area by multiplying a lime-soil pile length by a dry density of a soil body by a water consumption.
Further, as a specific implementation mode of the synchronous water injection and humidification construction process for the lime-soil compaction pile, the loss coefficient of water consumption is 1.02-1.05. The loss coefficient set by the specification is 1.05-1.1, and the water consumption is saved compared with large-area pre-soaking because the method is synchronously accurate to the soaking of each pile hole. According to the actual measurement statistics, the water consumption coefficient of the invention can be controlled to be 1.02-1.05.
Further, as a specific implementation of the synchronous water injection and humidification construction process for the lime-soil compacted pile, a plurality of water outlet holes 8 are uniformly distributed along the circumferential direction of the connection part of the pile pipe body 6 and the pile tip 7. The arrangement is to uniformly sprinkle water, improve the uniform humidifying effect of the surface layer and the deep layer and avoid the waste of water resources.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The synchronous water injection and humidification construction process for the lime-soil compaction pile is characterized by being suitable for collapsible loess with large thickness and low water content, and comprising the following steps of:
firstly, determining the pile length and the point distribution distance of the lime-soil compaction piles according to the requirements of the depth of the wet subsidence and the bearing capacity of the foundation;
step two, obtaining the dry density of the collapsible loess soil body, the optimal water content of the soil body and the average natural water content through a geotechnical test, calculating the water adding amount of a single pile, wherein the water adding amount of the single pile is equal to the difference value between the optimal water content and the average natural water content, multiplied by the single pile processing area, multiplied by the length of an ash soil compaction pile, multiplied by the dry density of the soil body, multiplied by the loss coefficient of water consumption, and the loss coefficient of the water consumption is 1.02-1.05;
step three, erecting a synchronous humidifying device at a position where pile driving is needed, wherein the synchronous humidifying device comprises an annular spraying pipe (1) and a plurality of supporting legs connected below the annular spraying pipe (1), a pipe body of the annular spraying pipe (1) is connected with a water inlet pipe orifice (3) and a plurality of water outlets, and the water outlets are arranged towards a perpendicular bisector of the annular spraying pipe (1); the water inlet pipe mouth (3) is connected with an external water supply pipe, a water meter and a water pump;
step four, inserting the pile pipe (4) of the pile driver into the middle of the annular spraying pipe (1) for pore-forming construction, and synchronously injecting water according to the water adding amount of the single pile calculated in the step two while forming pores until the designed pile length is reached;
step five, after the hole forming is finished, moving the synchronous humidifying device to the next piling position, and repeating the step three to the step four until the hole forming of all the pile holes is finished;
and step six, ramming the prepared lime soil into pile holes to form piles, detecting compaction degree according to requirements, detecting composite foundations according to standard requirements, and finishing piling.
2. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 1, wherein the stability of the synchronous humidification device is detected in the third step, and then test spraying is performed after the water inlet pipe mouth (3) is connected with an external water supply pipe and a water meter.
3. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 2, wherein in the third step, the depth of the support leg buried in the soil is not less than 30cm, and the height of the support leg above the ground is 15-25 cm.
4. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 3, wherein the water outlets are uniformly distributed on the pipe body of the annular spraying pipe (1) in the third step.
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| JPH10237856A (en) * | 1997-02-27 | 1998-09-08 | Shimizu Corp | Construction mehtod for soil improvement using both pile and sand compaction pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203557602U (en) * | 2013-11-14 | 2014-04-23 | 福建恒杰塑业新材料有限公司 | Spray type circulation cooling device |
| CN209550650U (en) * | 2018-12-04 | 2019-10-29 | 河北冀能化工设备有限公司 | A kind of circular spray tube automatic punch molding machine |
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- 2019-11-21 CN CN201911149808.5A patent/CN110820790B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10237856A (en) * | 1997-02-27 | 1998-09-08 | Shimizu Corp | Construction mehtod for soil improvement using both pile and sand compaction pile |
| EP1956147A1 (en) * | 2007-02-09 | 2008-08-13 | Geosec S.r.l. | Local seismic protection method for existing and/or possible construction sites destined for the foundation areas and those surrounding the building construction |
| CN101307599A (en) * | 2007-05-16 | 2008-11-19 | 郝运成 | Prefabricated hollow pile sinking method |
| CN107905212A (en) * | 2017-09-27 | 2018-04-13 | 中铁三局集团有限公司 | A kind of construction method of original position water filling element earth pile composite foundation |
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