CN108385667A - A kind of geotextiles anti-block water permeable pile driving construction device and method - Google Patents

Abstract

The invention discloses a construction device and method of a geotechnical anti-clogging permeable pile, which solves the problems in the prior art that the permeable pile is easy to be blocked and the water permeability is reduced during the construction process, and has the advantages of not only ensuring the water permeability, but also reducing soil particles to avoid the blockage effect of permeable piles; its technical scheme is: including detachably connected casing and pile tip, the top of the pile tip has a protrusion that matches the casing, and the circumferential interval of the protrusion is distributed with a number of first suspensions. part; the sleeve is connected to the pile tip through a geotextile bag set at the bottom to prevent the permeable pile from being blocked during construction; the bottom of the geotextile bag has a second suspension part that matches the first suspension part, Ensure that the geotextile bag is tightly connected to the pile tip.

Description

Construction device and method of geotechnical cloth anti-clogging permeable pile

technical field

The invention relates to the field of civil engineering, in particular to a construction device and method for geotextile anti-clogging permeable piles.

Background technique

With the vigorous construction of infrastructure, composite foundation technology is developing rapidly in our country. A typical trend in the development of ground treatment in recent years is to continuously develop new ground treatment methods on the basis of existing ground treatment methods, especially the comprehensive use of various ground treatment methods, forming a very distinctive composite reinforcement technology .

From the perspective of water permeability, the vertical reinforcement of composite foundation can be roughly divided into two types: water permeability and water impermeability. Permeable piles take into account both rapid drainage and high strength. Replacing other piles with permeable piles can improve the dynamic compressive and tensile strength of pile foundations on the premise of ensuring water permeability, thereby speeding up the ultra-static pores in the foundation caused by earthquakes. The dissipation of water pressure improves the overall earthquake resistance of the foundation.

However, permeable piles will encounter clogging problems during the construction process, resulting in a decrease in their water permeability; during the consolidation process of the foundation, the mobile particles in the piping soil will also enter the pores of the pile material under the action of a sufficiently large seepage force , causing blockage; during an earthquake, the liquefaction of the foundation makes the soil in a flowing or semi-fluid state, and the flow of fine particles in the soil will also cause the blockage of the permeable pile.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a construction device and method for a geotechnical anti-clogging permeable pile, which can not only ensure the water permeability, but also reduce the entry of soil particles and avoid the clogging of the permeable pile.

The present invention adopts following technical scheme:

A construction device for a geotechnical anti-clogging permeable pile, comprising a detachably connected sleeve and a pile point, the top of the pile point has a protrusion matching the sleeve, and a plurality of first suspension parts are distributed at intervals in the circumferential direction of the protrusion;

The casing is connected to the pile tip through a geotextile bag set at the bottom to prevent the permeable pile from being blocked during construction;

The bottom of the geotextile bag has a second suspension part matched with the first suspension part to ensure the tight connection between the geotextile bag and the pile tip.

Further, the geotextile bag is made of warp-knitted composite geotextile.

Further, the first hanging part is a hook, and the second hanging part is a ring.

Further, the first suspension part is a suspension ring, and the second suspension part is a hook.

Further, there is a cavity inside the sleeve, and the diameter of the protrusion is smaller than the inner diameter of the cavity by a set distance.

Further, the pile point is in the shape of an inverted cone.

Further, the material of the pile tip is prefabricated concrete or steel.

A construction method for geotechnical deployment anti-clogging permeable piles, comprising the following steps:

Step (1) Construction device installation:

Put the geotextile bag on the bottom end of the casing, and after the second hanging part of the geotextile bag is matched with the first hanging part of the pile tip, the casing and the pile tip are snapped together;

Step (2) sinking tube to make holes:

The sinking depth of the pile tip is determined in advance, and the hole is made with a vibrating pipe sinking machine, and the sinking pipe stops after reaching the set elevation;

Step (3) permeable concrete pouring and extubation:

Use a hopper to add permeable concrete material into the casing until the designed amount is met; after the immersed tube is vibrated on the spot for a set time, the tube is pulled out while vibrating until all the pile tubes are pulled out.

Further, in the step (3), the gradation of the permeable concrete material is mainly gravel with a particle size of 10-20 mm, and reinforcing materials and admixtures are added.

Further, in the step (3), in the process of extubation, when the material in the casing is stuck, the wall of the casing is thumped, and the reverse insertion is performed, and the vibration is maintained for 10 seconds each time.

Compared with prior art, the beneficial effect of the present invention is:

(1) The top of the pile point of the present invention is provided with a protrusion and a hook, the diameter of the protrusion is smaller than the inner diameter of the casing, and the bottom of the geotextile bag has a suspension ring, which ensures that the casing and the pile point are tightly connected during the sinking process and are not easy to fall off;

(2) The present invention uses warp-knitted composite permeable geotextiles, which have the function of allowing moisture to pass through and block the loss of sand and soil particles; The soil particles in the soil are isolated, effectively reducing the soil particles into the gaps of the pervious concrete piles, and ensuring the permeability of the pervious concrete piles.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is a pile tip front view of the present invention;

Fig. 2 is a top view of the pile point of the present invention;

Fig. 3 is the overall installation schematic diagram of the present invention;

Fig. 4 is the construction schematic diagram of the present invention;

Among them, 1-pile tip, 2-hook, 3-protrusion, 4-sleeve, 5-geotextile bag.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, 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 application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As introduced in the background technology, there are deficiencies in the prior art that permeable piles are easily blocked during construction and the water permeability is reduced. In order to solve the above technical problems, this application proposes a construction device and method for geotechnical cloth anti-clogging permeable piles.

In a typical implementation of the present application, as shown in Fig. 1-Fig. 4, a kind of geotextile anti-clogging permeable pile construction device is provided, including pile point 1, casing 4 and geotextile bag 5; Hollow, its overall shape is cylindrical.

The pile point 1 is in an inverted cone shape, and the top surface of the pile point 1 has a cylindrical protrusion 3, so that the pile point 1 and the casing 4 are firmly combined to avoid falling off during the sinking process and affecting the quality of the pile body.

The diameter of the protrusion 3 is smaller than the top diameter of the pile tip 1 and smaller than the inner diameter of the casing 4; a plurality of hooks 2 are arranged at intervals in the circumferential direction of the protrusion 3 .

The specific quantity of hook 2 is determined according to the diameter of pile point 1 top.

The height of the protrusion 3 is 8-10cm, and its diameter is 1-3cm smaller than the inner diameter of the casing; the casing 4 can be easily pulled out during the extubation process, and the pile tip remains at the bottom of the hole after the extubation.

The pile tip 1 is made of prefabricated concrete or steel.

The geotextile bag 5 is sleeved on the bottom of the casing, and the bottom of the geotextile bag cover 5 has the same number of suspension rings that match the hook 2, and the hook 2 hooks the suspension rings to ensure that the geotextile bag 5 is connected to the pile during the sinking process. Tip 1 is tightly connected and not easy to fall off.

The geotextile bag 5 is made of warp-knitted composite geotextile, which has the function of allowing water to pass through and blocking the loss of sand particles.

The warp-knitted composite geotextile is different from ordinary woven fabrics. Its biggest feature is that the intersection of warp and weft is not bent, and each is in a straight state; the two are tied firmly with binding wires, which can be synchronized evenly across the board, withstand external forces, and distribute Stress, and when the external force is applied to tear the material, the yarn will gather along the initial crack to increase the tear resistance.

When warp knitting is combined, the warp knitting binding thread is used to repeatedly travel between the warp and weft yarns and the fiber layers of the staple fiber needle-punched geotextile to knit the three into one. Therefore, the warp-knitted composite geotextile not only has the characteristics of high tensile strength and low elongation, but also has the performance of needle-punched nonwovens.

Therefore, the warp-knitted composite geotextile is a kind of geotextile that can be used for reinforcement, isolation and protection, and has a three-dimensional overall normal and horizontal direction and has better water collection and different water effects. It is a multifunctional geotechnical composite material because its solid matrix and pores are continuous phases and have a porous filtering effect.

The geotextile bag 5 made of composite geotextile wraps the permeable concrete pile body with the geotextile bag 5 during the construction process, so that the permeable concrete pile body is isolated from the soil particles in the soil, so that the soil particles can be effectively reduced Enter the gap of the pervious concrete pile to ensure the permeability of the pervious concrete pile.

The construction process of the geotextile anti-clogging permeable pile can be divided into the pile tip installation stage, the geotextile installation stage, the sinking tube hole making stage, and the permeable concrete pouring and pipe pulling stages.

Specifically include the following steps:

Step (1) pile tip installation stage:

The bottom of the traditional vibrating immersed tube is equipped with movable steel pile shoes. However, during the process of lifting the immersed pipe after grouting, the movable plate of the pile shoe cannot be fully opened due to the limitation of the mud pressure and the fluidity of the cement slurry, resulting in the failure of the movable pile tip scheme. Feasibility is greatly reduced.

This application uses a disposable pile point 1 instead of a movable steel pile shoe. The material of the pile point 1 is prefabricated concrete or steel; since the top of the pile point 1 has a protrusion 3, it can be firmly combined with the casing 4 to avoid falling off during the sinking process. , affecting the quality of the pile body.

Step (2) Geotextile installation stage:

During the construction of traditional bag piles, problems such as hole collapse in the sand layer or necking in the silt layer often occur, making it difficult to place the bag at the design depth and the pile diameter cannot meet the design requirements.

In this application, the geotextile bag 5 is set outside the casing 4, which can ensure that the pile body of the permeable pile is more regular, and the pile diameter can meet the design requirements; 4 is closely connected with the pile tip 1, that is, the geotextile bag 5 is placed on the bottom of the casing 4, and after the lifting ring of the geotextile bag 5 is matched with the hook of the pile tip 1, the casing 4 and the pile tip 1 are snapped together.

Step (3) immersed tube hole making stage:

When using a vibrating pipe sinking machine to make a hole, before starting to sink the pipe, the sinking depth of the pile tip must be determined according to the ground elevation of the pile site and the design elevation of the pile tip.

During the sinking process of the pile pipe (casing pipe and pile tip installed to become the pile pipe) and after sinking into the design depth, the verticality of the pile pipe must be checked in time, and the verticality deviation is not greater than 1%.

The geotextile bag 5 is placed outside the casing 4, and the geotextile bag sinks with the pile pipe during the hole making process; after the immersed pipe reaches the design elevation, permeable concrete pouring or gravel filling starts.

Step (4) permeable concrete pouring and tube removal stage:

The aggregate gradation of permeable concrete piles is mainly crushed stone with a particle size of 10-20mm, and reinforcing materials, admixtures, etc. are added.

Preferably, the permeable concrete pile mix ratio is:

Cement: water: aggregate: water reducer: chemical additives = 325: 95-105: 1550-1650: 11.2: 6.4.

After the immersed tube is driven into the ground to the designed length of the pile body, the permeable concrete material with the above mix ratio must be input as soon as possible with the hopper until the mixture in the casing meets the design amount of the pile body.

After the feeding is completed, start the motor, leave the immersed tube in place for 10 seconds, and then pull out the tube while vibrating. The speed of tube pulling is controlled at 2.2-2.5m/min.

In case of silt or textured soil, the extubation speed can be appropriately slowed down; in the process of extubation, if the material in the tube sticks out, the wall of the tube can be thumped, and the reverse insertion can be performed, and the vibration can be maintained for 10 seconds each time.

Repeat this until all the pile tubes are pulled out and the shape is formed.

This application uses composite permeable geotextiles to form bagged anti-clogging permeable piles through the improved vibration sinking method, which can not only ensure water permeability, but also reduce the entry of soil particles, avoiding clogging of permeable piles, and has a very high impact on foundation treatment. Value.

In another embodiment of the present application, it includes a pile point, a sleeve and a geotextile bag, the pile point is in an inverted cone shape, the top surface of the pile point has cylindrical protrusions, and multiple a lifting ring; the geotextile bag is set on the bottom of the casing, and the bottom of the geotextile bag cover has the same number of hooks that match the lifting ring.

The other structures are the same as those of the above-mentioned embodiment, and will not be repeated here.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A geotextile anti-clogging permeable pile construction device is characterized in that it comprises a casing and a pile point that are detachably connected, and the top of the pile point has a protrusion that matches with the casing, and the circumferential intervals of the protrusions are distributed several times. a suspension part; The casing is connected to the pile tip through a geotextile bag set at the bottom to prevent the permeable pile from being blocked during construction; The bottom of the geotextile bag has a second suspension part matched with the first suspension part to ensure the tight connection between the geotextile bag and the pile tip. 2 . The construction device of a geotextile anti-clogging permeable pile according to claim 1 , wherein the geotextile bag is made of warp-knitted composite geotextile. 3 . 3 . The construction device for geotextile anti-clogging permeable piles according to claim 1 , wherein the first suspension part is a hook, and the second suspension part is a suspension ring. 4 . 4 . The construction device for geotextile anti-clogging permeable piles according to claim 1 , wherein the first suspension part is a suspension ring, and the second suspension part is a hook. 5 . The construction device of geotextile anti-clogging permeable pile according to claim 1 , wherein the casing has a cavity inside, and the diameter of the protrusion is smaller than the inner diameter of the cavity by a set distance. 5 . 6 . The construction device of a geotechnical anti-clogging permeable pile according to claim 1 , wherein the pile tip is in the shape of an inverted cone. 7 . 7. A geotechnical deployment anti-clogging permeable pile construction device according to claim 1, characterized in that the material of the pile tip is prefabricated concrete or steel. 8. A construction method for geotextile anti-clogging permeable piles, characterized in that, using the construction device as described in any one of claims 1-7, comprising the following steps: Step (1) Construction device installation: Put the geotextile bag on the bottom of the casing, and after the second suspension part of the geotextile bag is matched with the first suspension part of the pile tip, the casing and the pile tip are snapped together; Step (2) sinking tube to make holes: Predetermine the sinking depth of the pile tip, use a vibrating pipe sinking machine to make holes, and stop the sinking pipe after reaching the set elevation; Step (3) permeable concrete pouring and extubation: Use a hopper to add permeable concrete material into the casing until the designed amount is met; after the immersed tube is vibrated on the spot for a set time, the tube is pulled out while vibrating until all the pile tubes are pulled out. 9. The construction method of a kind of geotextile anti-clogging permeable pile according to claim 8, characterized in that, in the step (3), the gradation of the permeable concrete material is mainly crushed stone with a particle size of 10-20 mm, and reinforced materials, additives. 10. The construction method of a geotechnical cloth anti-blockage permeable pile according to claim 8, characterized in that, in the step (3), when the material in the casing is stuck during the extubation process, the pipe is thumped Wall, and reverse insertion, each reverse insertion stay vibration 10s.