阅读说明：本技术 一种灰土挤密桩同步注水增湿施工工艺 (Synchronous water injection humidifying construction process for lime-soil compaction pile ) 是由 葛忻声 孙静苑 闫伯林 于 2019-11-21 设计创作，主要内容包括：本发明属于地基处理技术领域,具体是一种灰土挤密桩同步注水增湿施工工艺,解决了背景技术中的技术问题。该工艺主要通过在需要打桩的位置处架设同步增湿装置,所述同步增湿装置包括环形喷淋管以及连在环形喷淋管下方的数条支撑腿,所述环形喷淋管的管体上连接有进水管口和数个出水口；或者在打桩机的桩管中设置从上至下的注水管来实现同步增湿。通过本发明提供的一种灰土挤密桩同步注水增湿施工工艺能实现注水增湿与灰土挤密桩施工同步进行,注水量可人为控制,节约水资源,达到了桩孔表层和深层均匀增湿的效果,成孔挤密效果好；通过改工艺使得灰土挤密桩具有边成孔、边注水的短工期优势,而且达到了处理深度翻倍的突破,能达到30m。(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.)

1. A synchronous water injection and humidification construction process for a lime-soil compaction pile is characterized by comprising 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 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, tamping the prepared lime soil into piles, detecting compaction degree according to requirements, detecting a composite foundation according to standard requirements, and finishing piling.

2. The synchronous water injection and humidification construction process of the lime-soil compaction pile according to claim 1, wherein in the second step, the water adding amount of a single pile is equal to a loss coefficient of a difference value between the optimal water content and the average natural water content multiplied by a single pile treatment area multiplied by a lime-soil pile length multiplied by a dry density of a soil body multiplied by a water consumption.

3. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 2, wherein the loss coefficient of water consumption is 1.02-1.05.

4. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 3, wherein 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.

5. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 4, 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.

6. The synchronous water injection and humidification construction process for the lime-soil compaction pile as claimed in claim 5, wherein the water outlets are uniformly distributed on the pipe body of the annular spraying pipe (1) in the third step.

7. A synchronous water injection and humidification construction process for a lime-soil compaction pile is characterized by comprising 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 joint 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;

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 water adding amount of the single pile calculated 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.

8. The synchronous water injection and humidification construction process of the lime-soil compaction pile as claimed in claim 7, wherein in the second step, the water adding amount of the single pile is equal to the difference between the optimal water content and the average natural water content multiplied by the single pile treatment area multiplied by the lime-soil pile length multiplied by the dry density of the soil mass multiplied by the loss coefficient of the water consumption.

9. The synchronous water injection and humidification construction process for the lime-soil compaction pile according to claim 8, wherein the loss coefficient of water consumption is 1.02-1.05.

10. The synchronous water injection and humidification construction process of the lime-soil compaction pile as claimed in claim 9, wherein the plurality of water outlet holes (8) are evenly distributed along the circumference of the connection of the pile tube body (6) and the pile tip (7).

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 pre-soaking method has large water consumption and long construction period, and at least 5 tons of water are needed for treating the volume of 1 cubic meter. 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-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 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; 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 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 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 spray water, improve the effect of uniformly humidifying 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 spray water, improve the effect of uniformly humidifying 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.