WO2019218666A1

WO2019218666A1 - Anti-clogging strengthened water-permeable pile and construction method

Info

Publication number: WO2019218666A1
Application number: PCT/CN2018/121825
Authority: WO
Inventors: 崔新壮; 李晋; 金青; 张炯; 王洁茹; 张小宁; 王艺霖; 李骏
Original assignee: 山东交通学院; 山东大学
Priority date: 2018-05-18
Filing date: 2018-12-18
Publication date: 2019-11-21
Also published as: AU2018102180A4; CN108442365A; AU2018102180A6; CN108442365B; ZA202006047B; AU2018424102A1

Abstract

Disclosed are an anti-clogging strengthened water-permeable pile and a construction method. The anti-clogging strengthened permeable pile is formed by strengthening a water-permeable geotextile (5), adding a two-way geogrid (4), and forming a geotextile cylinder (7), which can not only improve the forming ability of a pile body, but also improve the strength of the pile body of the water-permeable pile; and then wrapping the geotextile cylinder with a water-permeable concrete pile to form a bagged water-permeable concrete pile, which can not only ensure good permeability, but also reduce the entry of soil particles to prevent the water-permeable concrete pile from being clogged. Moreover, the geogrid (4) has a large tensile strength itself and thus closely encloses the pile body, so that the pile body has greater strength and modulus, thereby improving the resistance to deformation and damage.

Description

Anti-blocking enhanced permeable pile and construction method

Technical field

The invention relates to the field of civil engineering, in particular to an anti-clogging and enhanced water-permeable pile and a construction method thereof.

Background technique

With the wide application of permeable materials in civil engineering, people have gradually proposed the design concept of permeable piles. The new pile body has high strength and can form a pile body, which can improve the bearing capacity of the foundation. The permeable concrete pile has large porosity and strong permeability, and can form a good vertical drainage channel, which can accelerate the foundation consolidation rate during the construction period and preloading period of the embankment, and reduce post-construction settlement. However, the permeable piles will encounter clogging problems during the construction process, resulting in a decrease in water permeability; in the consolidation process of the foundation, the movable particles in the piping soil will also enter the pores of the pile material under the action of sufficient penetration force. , causing blockages.

Summary of the invention

In order to solve the technical problems existing in the prior art, the present invention discloses a construction method for preventing clogging and strengthening a permeable pile, strengthening the permeable geotextile, adding a two-way geogrid to form a geotextile, which can increase the pile body. The molding ability can also improve the pile strength of the permeable pile. Then it is wrapped with the permeable concrete pile to form a bagged permeable concrete pile, which can ensure good permeability, reduce the entry of soil particles and avoid the blockage of the permeable concrete pile; and the large tensile strength of the geogrid itself, the pile The body is tightly enclosed, so that the pile has greater strength and modulus, which improves its ability to resist deformation and damage.

The specific implementation adopted by the present invention is as follows:

An anti-blocking and enhanced water-permeable pile, comprising a concrete pile, wherein a geotextile drum is arranged on an outer ring of the concrete pile, and the geotextile drum is composed of a geogrid and a permeable geotextile, and is located at a bottom of the pile body. The lower part of the geotextile is connected to the top of the pile tip of the concrete pile.

Further, a connecting ring is arranged on a side of the geotextile cylinder at the bottom of the pile body, and a hook is arranged above the pile tip of the concrete pile, and the hook is hooked on the connecting ring.

Further, the connecting ring includes a plurality of connecting rings that are annularly distributed along a lower side surface of the geotextile.

Further, the hook comprises a plurality of hooks, and the plurality of hooks are annularly distributed along an upper section of the pile tip.

Further, the top of the pile tip is provided with a groove, the groove height is 5-8 cm, and the diameter is 1-2 cm larger than the diameter of the sleeve.

Further, the height of the geotextile cylinder is 0.5-1 m higher than that of the concrete pile, and the excess length is tied and fixed at the top of the pile.

Further, the geotextile cartridge comprises a plurality of geotextile cylinders distributed up and down along the axial direction of the concrete pile, and the adjacent geotextile cylinders are overlapped by a certain length and bonded together.

The construction method of the permeable pile described above is as follows:

Step 1. The pile driver enters the site, and determines the height of the frame and the length of the immersed pipe according to the design length and the depth of the immersed pipe, and assembles;

Step 2: Place the pile tip according to the design, and the pile tip is prefabricated for concrete or prefabricated with steel;

Step 3: designing a geotextile according to the pile diameter and the length of the pile;

The geotextile drum is divided into two parts: a permeable geotextile and a two-way geogrid. The two-way geogrid is bent into a tubular shape, and then a permeable geotextile is placed on the outside, and the permeable geotextile and the two-way geogrid are integrally formed, and then the casing is sleeved, and the diameter of the geotextile can be determined according to the pile diameter and the length of the pile. And length;

Step 4: The geotextile is first wrapped on the outside of the casing, and the casing is connected with the pile tip. The geotextile is inlaid with a hoop, and then the iron ring is connected with the hook of the top surface of the pile tip, so that the geotextile is in the process of vibration and sinking. Not easy to fall off;

Step 5: using a vibrating pipe sink to make holes; the cloth sleeve is sleeved outside the pipe, and is lifted by a lifting machine. During the hole making process, the cloth cylinder sinks with the pipe, and after the pipe reaches the design elevation, the water-permeable pile is infused; Pull the tube to the natural ground, and then sink the pile to the bottom of the pile; after filling the casing with permeable concrete, first vibrate for a certain period of time, then start to extubate the tube, and then pull the tube while vibrating, and then pull out the vibration for a certain distance every time. Repeatedly until the pile tube is completely pulled out, and the shape is formed;

Step 6 Close the geotextile cylinder of the pile with a wire tie to prevent the debris from contaminating the pile and clean the surrounding of the pile hole.

Further, the geogrid has a mesh size of 80 mm×80 mm, a transverse rib and a longitudinal rib width of 4-5 mm, and a thickness of 2-3 mm; in order to ensure close contact between the geotextile and the pile wall and the pipe wall, the geotextile The diameter should be larger than the casing 5-8cm, the length should be longer than the design pile length 0.5-1m, and the excess length should be fixed at the top of the pile.

Because the pile body is relatively long, and the structure of the geotextile cylinder is relatively short, a plurality of geotextile cylinders are arranged on the upper and lower sides of a pile body, and the overlap width between adjacent cloth cylinders is ≥200 mm, and the joints are tight and fully bonded.

Further, before starting the immersed tube, the pile sinking depth of the pile must be determined according to the ground level of the pile and the design elevation of the pile end. After the pile tube sinks and sinks to the design depth, the verticality of the pile tube should be checked in time, and the deviation of the verticality is not more than 1%.

The beneficial effects of the present invention are as follows:

The permeable geotextile has the function of allowing moisture to pass through and blocking the loss of sand particles, and combining it with the permeable pile can solve the clogging problem well. In the process of construction of the permeable pile, the problem of irregular formation of the pile is prone to occur, and the pile of the permeable pile can be reinforced by the geogrid. The permeable geotextile is strengthened and a two-way geogrid is added to form a geotextile, which not only increases the forming ability of the pile but also improves the pile strength of the permeable pile. Then it is wrapped with the permeable concrete pile to form a bagged permeable concrete pile, which can ensure good permeability, reduce the entry of soil particles and avoid the blockage of the permeable concrete pile; and the large tensile strength of the geogrid itself, the pile The body is tightly enclosed, so that the pile has greater strength and modulus, which improves its ability to resist deformation and damage.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims

Figure 1 is a front view of the pile tip;

Figure 2 is a plan view of the pile tip;

Figure 3 is a plan view of the geotextile bag;

Figure 4 is a construction process diagram;

In the picture: 1 pile tip, 2 hooks, 3 grooves, 4 geogrid, 5 permeable geotextile, 6 connecting ring, 7 geotextile, 8 casing.

Detailed ways

It should be noted that the following detailed description is illustrative and is intended to provide a further description of the application. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise indicated.

It is to be noted that the terminology used herein is for the purpose of describing particular embodiments, and is not intended to limit the exemplary embodiments. As used herein, the singular " " " " " " There are features, steps, operations, devices, components, and/or combinations thereof;

For convenience of description, if the words "upper", "lower", "left" and "right" appear in the present invention, it only indicates the upper, lower, left and right directions of the drawing itself, and does not limit the structure, only It is to be understood that the invention is not to be construed as a limitation of the invention.

Term Explanation Part: The two-way geogrid is a grid consisting of two directions, radial and latitudinal.

As described in the background art, in the prior art, there is a clogging problem in the construction process of the permeable pile, which leads to a decrease in the water permeability; in the consolidation process of the foundation, under the action of sufficient penetration force in the piping soil The movable particles also enter the pores of the pile material to cause clogging. In order to solve the above technical problems, the present application proposes a construction method for preventing clogging and strengthening the permeable pile, strengthening the permeable geotextile and adding a two-way geogrid to form The geotextile can not only increase the forming capacity of the pile, but also improve the pile strength of the permeable pile. Then it is wrapped with the permeable concrete pile to form a bagged permeable concrete pile, which can ensure good permeability, reduce the entry of soil particles and avoid the blockage of the permeable concrete pile; and the large tensile strength of the geogrid itself, the pile The body is tightly enclosed, so that the pile has greater strength and modulus, which improves its ability to resist deformation and damage.

The specific technical solutions are as follows:

An anti-blocking reinforced water permeable pile, comprising a concrete pile, a geotextile drum 7 is arranged on an outer ring of the concrete pile, and the geotextile drum 7 is composed of a geogrid and a permeable geotextile, and the geotextile drum A connecting ring 4 is provided on the lower side of the lower part of the pile 7. A hook 2 is provided at the pile tip of the concrete pile, and the hook 2 is attached to the connecting ring 4.

The connecting ring 4 includes a plurality of connecting rings which are annularly distributed along the lower side of the geotextile cylinder, that is, a ring connecting ring is provided; the hook 2 includes a plurality of hooks 2 and the upper cross-section of the plurality of hooks 2 along the pile tip Distribution, that is, set a ring of connecting rings; the number of hooks and connecting rings is equal.

Further, preferably, the top of the pile tip 1 is provided with a groove 3, the groove height is 5-8 cm, and the diameter is 1-2 cm larger than the diameter of the sleeve;

Further, preferably, the height of the geotextile is 0.5-1 m higher than that of the concrete pile, and the excess length is fixed at the top of the pile.

Further, the permeable geotextile 5 is a new type of building material, and the raw material is a synthetic fiber of a polymer such as polyester, polypropylene, acrylic, or nylon. Geotextile has excellent filtration, isolation, reinforcement and protection, high tensile strength, good permeability, high temperature resistance, antifreeze, aging resistance and corrosion resistance. The geogrid 6 is a mesh-shaped reinforced earth material composed of longitudinal ribs and transverse ribs, and is formed by two-dimensional grid or thermoplastic molding of a polymer such as polypropylene or polyvinyl chloride. A highly dimensional three-dimensional grid screen. Attaching the geogrid to the inner side of the permeable geotextile not only enhances the tensile strength of the entire geotextile, but also takes into account the water permeability of the permeable geotextile. The strength of the entire pile is improved, and the blockage of the soil particles to the permeable pile is reduced.

The specific construction methods are as follows:

1. The pile driver enters the site, and the height of the frame and the length of the immersed pipe are determined according to the design length and the depth of the immersed pipe, and assembly is carried out. The pile tip is placed as designed, and the pile tip is prefabricated for concrete (also prefabricated with steel). The shape of the pile tip is shown in the figure. There is a groove in the middle of the pile tip, so that it can be firmly coupled with the casing to avoid falling off during the sinking process and affecting the quality of the pile. The groove height is 5-8cm, and the diameter is 1-2cm larger than the diameter of the casing, so that the casing can be easily pulled out during the extubation process, and the pile tip remains at the bottom of the hole after the tube is extracted. A hook is prefabricated at the top edge of the pile tip for connection to the geotextile.

2. The geotextile can be made according to the design of the pile diameter and the length of the pile. The production process is as follows:

Further preferably, the geogrid has a mesh size of 80 mm×80 mm, a transverse rib and a longitudinal rib width of 4-5 mm, and a thickness of 2-3 mm. In order to ensure that the geotextile drum and the pile wall are in close contact with the pipe wall, the diameter of the geotextile drum should be 5-8cm larger than the casing, and the length should be longer than the design pile length of 0.5-1m. The excess length is fixed at the top of the pile. The geotextile has a lap width of 200mm, and the joints are tight and well bonded. The geotextile is first wrapped on the outside of the casing, and the casing is connected to the pile tip. The bottom of the geotextile is inlaid with a hoop (connection ring), and then the iron ring (connection ring) is connected with the hook of the top surface of the pile to make the geotextile It is not easy to fall off during the vibration immersed tube process.

3. The vibrating pipe sink is used to make the hole. Before the immersed pipe is started, the pile tip sinking depth of the pile must be determined according to the ground level of the pile and the design elevation of the pile end. After the pile tube sinking process and sinking into the design depth, the verticality of the pile tube should be checked in time, and the deviation of the verticality is not more than 1%. The cloth sleeve is sleeved outside the tube and lifted by a lifting machine. During the hole making process, the cloth tube sinks with the tube. After the immersed tube reaches the design elevation, the permeable pile is infused.

4. During the hole making process, the cloth cylinder sinks with the pipe. When the immersion pipe is about 0.5m above the ground, open the window to insert the grouting pipe into the casing, start to infiltrate the permeable concrete, and extrude the pipe while filling the concrete. Natural ground, then sink to the bottom of the pile. After filling the casing with permeable concrete, first vibrate for 5~10s, then start extubating, and extubate the tube while vibrating. Pull out the vibration for 5~10s every 0.5-1.0m; repeat this until the pile tube is completely pulled out. forming. The geotextile cylinder with more piles is closed with a wire tie to prevent debris from contaminating the pile and clean the surrounding of the pile hole.

The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and various changes and modifications may be made to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Claims

An anti-blocking enhanced water-permeable pile, characterized in that it comprises a concrete pile, a geotextile drum is arranged on the outer ring of the concrete pile, and the geotextile drum is composed of a geogrid and a permeable geotextile, and is located in the pile The lower part of the geotextile at the bottom of the body is connected to the top of the pile tip of the concrete pile.
The anti-clogging and reinforced water-permeable pile according to claim 1, wherein a connecting ring is arranged on a side of the geotextile cylinder at the bottom of the pile body, and a hook is arranged above the pile tip of the concrete pile. The hook is attached to the connecting ring.
The anti-clogging enhanced water-permeable pile according to claim 2, wherein the connecting ring comprises a plurality of connecting rings which are annularly distributed along a lower side surface of the geotextile.
The anti-clogging enhanced water-permeable pile according to claim 2, wherein the hook comprises a plurality of hooks, and the plurality of hooks are annularly distributed along an upper section of the pile tip.
The anti-clogging enhanced water-permeable pile according to claim 1, wherein the top of the pile tip is provided with a groove having a groove height of 5-8 cm and a diameter of >1-2 cm.
The anti-clogging enhanced water-permeable pile according to claim 1, wherein the height of the geotextile cylinder is 0.5-1 m higher than that of the concrete pile, and the excess length is tied and fixed at the top of the pile.
The anti-clogging and reinforced water permeable pile according to claim 1, wherein the geotextile cylinder comprises a plurality of geotextile cylinders distributed up and down along the axial direction of the concrete pile, and the adjacent geotextile cylinders It must be lapped to a certain length and bonded together.
The method for constructing an anti-clogging enhanced water-permeable pile according to claim 1, wherein the method is as follows:

Step 1. The pile driver enters the site, and determines the height of the frame and the length of the immersed pipe according to the design length and the depth of the immersed pipe, and assembles;

Step 2: Place the pile tip according to the design, and the pile tip is prefabricated for concrete or prefabricated with steel;

Step 3: designing a geotextile according to the pile diameter and the length of the pile;

The geotextile drum is divided into two parts: a permeable geotextile and a two-way geogrid. The two-way geogrid is bent into a tubular shape, and then a permeable geotextile is placed on the outside, and the permeable geotextile and the two-way geogrid are integrally formed, and then the casing is sleeved, and the diameter of the geotextile can be determined according to the pile diameter and the length of the pile. And length;

Step 4: The geotextile is first wrapped on the outside of the casing, and the casing is connected with the pile tip. The geotextile is inlaid with a hoop, and then the iron ring is connected with the hook of the top surface of the pile tip, so that the geotextile is in the process of vibration and sinking. Not easy to fall off;

Step 5: using a vibrating pipe sink to make holes; the cloth sleeve is sleeved outside the pipe, and is lifted by a lifting machine. During the hole making process, the cloth cylinder sinks with the pipe, and after the pipe reaches the design elevation, the water-permeable pile is infused; Pull the tube to the natural ground, and then sink the pile to the bottom of the pile; after filling the casing with permeable concrete, first vibrate for a certain period of time, then start to extubate the tube, and then pull the tube while vibrating, and then pull out the vibration for a certain distance every time. Repeatedly until the pile tube is completely pulled out, and the shape is formed;

Step 6 Close the geotextile cylinder of the pile with a wire tie to prevent the debris from contaminating the pile and clean the surrounding of the pile hole.
The method for constructing an anti-clogging and reinforced water-permeable pile according to claim 8, wherein the geogrid has a mesh size of 80 mm×80 mm, the transverse rib and the longitudinal rib have a width of 4-5 mm, and the thickness is 2- 3mm; the diameter of the geotextile should be 5-8cm larger than the casing, and the length should be longer than the length of the designed pile 0.5-1m, and the excess length should be fixed at the top of the pile;

The overlap width between adjacent cloth cylinders is ≥200mm.
The method for constructing an anti-clogging enhanced water-permeable pile according to claim 8, characterized in that before the immersed tube is pressed, the pile tip sinking depth of the pile must be determined according to the ground level of the pile position and the design elevation of the pile end. After the pile tube sinks and sinks to the design depth, the verticality of the pile tube should be checked in time, and the deviation of the verticality is not more than 1%.