WO2020062940A1

WO2020062940A1 - Grouting consolidation method for full casing borehole guide prefabricated pile and prefabricated pile therefor

Info

Publication number: WO2020062940A1
Application number: PCT/CN2019/091230
Authority: WO
Inventors: 高永光; 高云飞
Original assignee: 高永光; 高云飞
Priority date: 2018-09-25
Filing date: 2019-06-14
Publication date: 2020-04-02
Also published as: US20210348355A1; SG11202102769TA; JP2022502586A; KR20210058901A; EP3839149A1; CN109295972A; CO2021003362A2; PH12021550571A1; EP3839149A4

Abstract

A grouting consolidation method for a full casing borehole guide prefabricated pile, comprising the following steps: S1, driving a drilling rig carrying a casing (1) to perform borehole construction, the borehole construction being performed to a preset hole depth to form a borehole (2); S2. the casing (1) being housed in the borehole (2); S3. implanting a prefabricated pile (4) into the borehole (2) so that the prefabricated pile (4) reaches a hole bottom of the borehole (2); S4. injecting a slurry (3) into the borehole (2); S5. pulling out the casing (1) so that the prefabricated pile (4) and an inner cavity of the borehole (2) are fixed and cemented into an integrated structure. Also provided is a prefabricated pile, comprising a pile body and a grouting channel (5) provided on the pile body, wherein a liquid inlet end (11) of the grouting channel (5) extends out from an upper end surface of the pile body and a liquid outlet end (12) of the grouting channel (5) extends out from a lower end surface of the pile body and/or a side surface of the pile body.

Description

Grouting consolidation method for full casing drilled guide prefabricated pile and prefabricated pile

Technical field

The invention relates to the technical field of foundations, in particular to a grouting consolidation method for a full-sleeve drill-guided precast pile and its precast pile.

Background technique

At present, in the field of foundation engineering of water area engineering, especially in the field of marine engineering technology, the pile foundations in rivers, lakes and seas are mostly bored cast-in-situ piles or hammered steel pipe piles. The most common construction methods and methods for bored-filled piles are Cofferdam construction of islands or the use of steel jackets to complete the construction work. Cofferdam island construction is also called island construction. In order to solve the problem of difficult construction in the marine environment, soil, sand and gravel need to be filled in the area surrounded by the cofferdam, and then the drilling and pouring process is performed. In addition, after the completion of the bored pile construction, the above-mentioned cofferdam island construction is also required to be removed, resulting in a huge amount of construction work using the above-mentioned cofferdam island construction method, which has the problems of long engineering cycle and high engineering cost. Similarly, because the hammered steel pipe pile is constructed by hammering and sinking into the foundation of the water area, when the hammered steel pipe pile encounters a hard bedrock, the end of the hammered steel pipe pile may be curled or even unable to hit. The problem of construction into the bedrock, and because the steel pipe with the hammered steel pipe pile cannot be taken out, not only the problem of corrosion is easy to occur, but also the problems of high construction cost and large amount of construction of the above construction method.

Summary of the Invention

Therefore, the present invention aims to provide a grouting consolidation method of a full casing drilled guide prefabricated pile and its prefabricated pile, in order to solve the prior art in the construction of a water-based foundation under various formation conditions, especially in marine engineering. In the foundation construction, the problems of large amount of bored cast-in-situ pile foundation construction, long engineering cycle and high engineering cost. The present application provides a grouting consolidation method for a full casing drilled guide prefabricated pile, which is used for foundation construction of a water area project, and includes the following steps:

S1. Drive a drilling rig with a casing to perform drilling operations, and the drilling operations are performed to a preset hole depth;

S2, the casing is accommodated in the borehole;

S3. The prefabricated pile is implanted into the borehole, so that the prefabricated pile reaches the bottom of the hole of the borehole;

S4. Injecting slurry into the borehole;

S5. Pull out the sleeve, so that the precast pile and the inner cavity of the drilled hole are fixed and cemented into an integrated structure.

Step S3, the step of implanting a precast pile into the borehole so that the precast pile reaches the bottom of the hole of the borehole includes the following steps: pre-injecting a slurry into the borehole; before the slurry solidifies , Implanting a prefabricated pile into the borehole to the bottom of the borehole.

The prefabricated pile is prefabricated with a grouting channel for injecting slurry into the borehole,

Step S5, the pulling out the casing includes: during the pulling out of the casing, continuously grouting into the borehole through a grouting channel on the precast pile;

And / or, in step S4, injecting the slurry into the borehole includes: before the casing is pulled out, grouting into the borehole through a grouting channel on the precast pile.

The grouting channel includes: a first grouting channel located on a bottom surface of the precast pile;

Step S5, the pulling out the casing includes: continuously pulling into the borehole through the first grouting channel and / or the second grouting channel during the process of pulling out the casing. Grouting

And / or, in step S4, injecting the slurry into the borehole includes: before the casing is pulled out, grouting into the borehole through the first grouting channel.

During the construction of waters with bedrock layers at the bottom,

Step S1, driving the drilling rig carrying the casing to perform drilling construction to a preset hole depth, including the following steps: sinking the casing to the bedrock layer; passing the drill's drill bit through the casing The inner cavity of the casing sinks to the bedrock layer, and drills the bedrock layer to form the bedrock borehole in the bedrock layer;

Step S2, the step of moving the drill bit of the rig out of the bedrock borehole, and the casing being accommodated in the bedrock borehole, comprises: sequentially drilling the drill bit from the bedrock and the Moving out of the casing, the lower end of the casing entering the opening edge of the borehole cavity of the bedrock,

The borehole includes the bedrock borehole.

During the construction of a water area with a loose layer and a bedrock layer in order from the bottom to the bottom, the above loose layer is a loose layer such as sand;

In step S1, driving the drilling rig carrying the casing to perform drilling construction, and drilling construction to a preset hole depth includes:

Sinking the casing to the loose layer, and drilling a hole in the loose layer to drive the casing through the loose layer to form a loose layer borehole;

Removing sediment from the casing;

Sinking a drill bit of the rig through the casing cavity to the bedrock layer, and drilling the bedrock layer to form the bedrock borehole in the bedrock layer;

Step S2, the step of removing the drill bit of the drilling rig from the borehole and accommodating the casing in the borehole includes: drilling the drill bit of the rig from the bedrock and the casing in order. Removed, the lower end of the casing enters the opening edge of the bedrock bore cavity;

The drilling includes the loose layer drilling and the bedrock drilling.

During the construction of waters with loose layers at the bottom,

In step S1, driving the drilling rig carrying the casing to perform drilling construction to a preset hole depth includes the steps of sinking the casing to the loose layer, and drilling the drill to the loose layer. The hole forms a loose layer drill hole, and drives the casing into the loose layer; removing the sediment in the casing.

The upper end of the precast pile is located above the water surface of the water area, and / or the upper end of the precast pile is located below the water surface of the water area.

The slurry includes cement slurry and / or mortar and / or chemical slurry.

A prefabricated pile including

Pile body

The grouting channel is provided on the pile body, the liquid inlet end of the grouting channel extends out of the upper end surface of the pile body, the liquid outlet end of the grouting channel extends out of the lower end surface of the pile body and / Or the side of the pile.

The pile body is a reinforced concrete prefabricated pile, and the grouting channel is a grouting pipe prefabricated on a reinforced cage of the pile body.

The technical solution of the present invention has the following advantages:

1. A grouting consolidation method for a full-casing drill-guided prefabricated pile for foundation construction of a water area project, comprising the following steps: S1, driving a drilling rig carrying a casing for drilling construction, drilling Construction to a preset hole depth; S2, the casing is accommodated in the borehole; S3, a precast pile is implanted into the borehole so that the precast pile reaches the bottom of the hole of the borehole; S4 , Injecting slurry into the borehole; S5, pulling out the sleeve so that the precast pile and the inner cavity of the borehole are fixed and cemented into an integrated structure. In order to adapt to the stratum of a variety of water engineering, especially the marine engineering environment that needs to be constructed on the seawater of rivers and lakes, this application first uses a casing to cooperate with drilling, then introduces the precast pile guide into the bottom of the hole, and finally injects slurry Realize the construction of water stratum in a fixed way. As the foundation of water area engineering has higher requirements for construction strength, casing can be used to assist drilling to adapt to different underwater stratum structures. The introduction of prefabricated pile guides into the bottom of the hole can effectively ensure the foundation of water area engineering. Stable and reliable construction. The pile foundation construction work of rivers, lakes, seas and other water strata is realized in the above manner. Because the process of building cofferdam islands and removing cofferdams is eliminated, and the above casing can also be reused, the large amount of engineering, long construction period and long construction period of the bored cast-in-place pile foundation can be solved under the premise of ensuring the construction intensity. And the problem of high engineering cost.

2. The grouting consolidation method for a full-casing drill-guided precast pile provided in the present invention, in step S3, the precast pile is implanted into the drilled hole so that the precast pile reaches the hole of the drilled hole The bottom includes the following steps: pre-injecting a slurry into the borehole; before the slurry is solidified, a precast pile is implanted into the borehole to reach the bottom of the borehole. By pre-injecting slurry into the borehole before implanting the precast pile in the borehole, the slurry in the precast pile and the borehole can be sufficiently cemented. Moreover, the falling impact force of the precast pile can also effectively make the slurry enter the bottom of the borehole, thereby forming a larger and solid bottom 2 fixed head.

3. The grouting consolidation method for a full-casing drill-guided prefabricated pile provided in the present invention, the prefabricated pile is prefabricated with a grouting channel for injecting slurry into the borehole, step S5, the extraction station The casing includes: during the process of extracting the casing, continuously grouting into the borehole through a grouting channel on the prefabricated pile; during the process of extracting the casing, through the above The grouting channel of the prefabricated pile can simply and conveniently make the slurry flow into the borehole to fill the gap generated during the pullout of the casing. In addition, through the above method, not only the precast pile and the ground surrounding the borehole can be tightly cemented and fixed to be applicable to various grounds, but also the casing can be pulled out more smoothly, the operation difficulty is reduced, and the existing waterbore drilling is solved. The problems of large amount of pile foundation, long engineering cycle and high engineering cost. In step S4, injecting the slurry into the borehole includes: before the casing is pulled out, grouting into the borehole through a grouting channel on the precast pile. Before the casing is pulled out, the slurry is injected into the borehole through the grouting channel, or the slurry is directly poured into the borehole. The operation is simple and convenient, which can make the precast pile and the ground around the borehole 2 Tightly cemented together to form a precast pile foundation, thereby improving the connection strength of the precast pile with soil, sand and gravel in the marine engineering environment.

4. The grouting consolidation method for a full casing drilled guide prefabricated pile provided by the present invention, the grouting channel comprises: a first grouting channel located on the bottom surface of the prefabricated pile; Set up grouting channels, so that the slurry can be injected into the boreholes from the bottom of the precast pile, so that the slurry can more evenly and fully fill the gap between the precast pile and the borehole, so that the precast pile and the ground around the borehole 2 are tightly cemented and fixed. Together form a precast pile foundation.

5. The grouting consolidation method for a full-casing drilling guide prefabricated pile provided in the present invention, in a water area construction process with a bedrock layer at the bottom, step S1, said driving a drilling rig carrying a casing for drilling construction, drilling The hole construction to a preset hole depth includes the following steps: sinking the casing to the bedrock layer; sinking a drill bit of the rig to the bedrock layer through the casing cavity, and drilling the bedrock layer To form the bedrock borehole in the bedrock layer. Step S2, the step of moving the drill bit of the rig out of the bedrock borehole, and the casing being accommodated in the bedrock borehole, comprises: sequentially drilling the drill bit from the bedrock and the The casing is removed, the lower end of the casing enters the opening edge of the inner cavity of the bedrock borehole, and the borehole includes the bedrock borehole. The drill bit of the rig drills the bedrock layer through the casing, which can effectively solve the problem that the bedrock layer is difficult to construct during the construction of the water area with the bedrock layer at the bottom. In addition, by pre-injecting slurry into the bedrock borehole and then sinking the precast pile into the bedrock borehole, through the falling impact of the precast pile, more slurry can be effectively penetrated and consolidated with the bedrock layer. This allows the slurry to fully fill the bottom and sides of the bedrock formation.

6. The grouting consolidation method for a full-casing drill-guided prefabricated pile provided by the present invention, in a water area construction process with a loose layer and a bedrock layer in order from the bottom to the bottom, step S1, the drive carries a casing Drilling rig for drilling construction to a preset hole depth includes sinking the casing to the loose layer, and drilling the hole to the loose layer to drive the casing through the loose layer Layer to form a loose layer for drilling; removing earth, rock, and sediment in the casing; sinking a drill bit of the rig through the casing cavity to the bedrock layer, and drilling the bedrock layer to form the bedrock layer Rock formations form the bedrock borehole. Step S2, the step of removing the drill bit of the drilling rig from the borehole and accommodating the casing in the borehole includes: drilling the drill bit of the rig from the bedrock and the casing in order. When removed, the lower end of the casing enters the open edge of the inner cavity of the bedrock borehole; the borehole includes the loose layer borehole and the bedrock borehole. Corresponding to the construction of waters with loose layers and bedrock layers in order from bottom to top, the loose layer is first drilled by the drill's drill bit, and then the sediment is discharged. Drilling the bedrock layer through a drill bit through the casing effectively solves the problem that the above waters are difficult to construct because of the loose layer and the bedrock layer. In addition, the bedrock boreholes are filled by injecting slurry into the bedrock boreholes in advance, and then the precast piles are settled into the bedrock boreholes. During the process of lifting the casing, the grouting channels of the precast piles are continuously loosened. The layer grouting method further completes the work of filling and fixing the bedrock layer and the loose layer respectively. The bedrock drilling adopts the fixing method of pre-grouting and re-implanting the precast pile, which can effectively make the slurry have sufficient time to be cemented and fixed with the bedrock drilling, and the slurry can penetrate the bedrock layer more fully under the impact of the precast pile's falling impact; loose The layer is grouted into the loose layer during the casing lifting process, which can effectively fill the gap between the precast pile and the casing with slurry to complete the above grouting work, so that the slurry can fully precast the pile and loose. The formations around the boreholes are cemented together.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the description of the prior art are briefly introduced below. Obviously, the appendixes in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor.

FIG. 1 is a schematic diagram of installation steps of a full casing of a water area having a loose layer and a bedrock layer provided by the present invention; FIG.

FIG. 2 is a schematic diagram of steps for pre-grouting in a water area having a loose layer and a bedrock layer provided in the present invention toward the bedrock layer; FIG.

3 is a schematic diagram of steps for sinking a precast pile to the bottom of a pre-grouted borehole in a water area having a loose layer and a bedrock layer provided by the present invention;

4 is a schematic diagram of a step of taking out a full casing in a water area having a loose layer and a bedrock layer provided by the present invention;

5 is a schematic diagram of a connection structure between a precast pile and a bottom of a water area after completion of a grouting consolidation process of a full casing drilled guide prefabricated pile in a water area having a loose layer and a bedrock layer provided by the present invention;

FIG. 6 is a schematic structural diagram of the precast pile sinking to the bottom of a borehole provided by the present invention; FIG.

FIG. 7 is a schematic structural diagram of a connection structure between a precast pile and a foundation foundation environment when a full casing is taken out after a full casing drilling and grouting process provided by the present invention is completed.

Reference sign description:

1-casing; 2-drilling; 3-grout; 4-precast pile; 5-grouting channel; 6-first grouting channel; 7-second grouting channel; 8- loose layer; 9- bedrock layer 10-water surface; 11-liquid inlet; 12-liquid outlet; 13-bedrock drilling; 14- loose layer drilling.

detailed description

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation Construction and operation should therefore not be construed as limiting the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only, and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or removable. Connected or integrated; it can be mechanical or electrical; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a grouting consolidation method for a full-casing drill-guided prefabricated pile. The engineering implementation environment is shown in Figs. 1 to 7. The bottom layer has a loose layer 8 and a bedrock layer 9 in this order from top to bottom. During water construction, the grouting consolidation method of a full-casing drill-guided precast pile includes the following steps:

In step S1, the casing 1 is sunk to the loose layer 8 through the water surface 10, and a drilling rig drills the loose layer 8 to drive the casing 1 through the loose layer 8 to form a loose layer. Drilling 14

Removing water and sediment from the casing 1;

Sinking a drill bit of the rig through the inner cavity of the casing 1 to the bedrock layer, and drilling the bedrock layer to form the bedrock borehole 13 in the bedrock layer;

In step S2, the drill bit of the rig is sequentially removed from the bedrock borehole 13 and the casing 1, and at this time, the lower end portion of the casing 1 enters the opening edge of the inner cavity of the bedrock borehole 13. So that the end of the casing 1 is sleeved with the opening edge of the bedrock borehole 13;

S3, pre-injecting cement slurry into the borehole 2; before the cement slurry is solidified, a precast pile 4 is implanted into the borehole 2, and the precast pile 4 reaches the bottom of the hole 13 of the bedrock; The upper end of the prefabricated pile 4 is located above the water surface of the water area, thereby facilitating the construction personnel to grout through the grouting hole 5 on the prefabricated pile 4;

S4, lifting the casing 1, during the ascent of the casing 1, through the grouting channel 5 on the prefabricated pile 4 to continuously grout the bedrock borehole 13 and the loose layer borehole 14; the grouting channel 5 includes: The first grouting channel 6 on the bottom surface of the prefabricated pile 4 is continuously grouting into the loose layer borehole 14 through the first grouting channel 6 during the process of pulling out the casing 1 so that the The prefabricated pile 4 is fixedly cemented with the hole wall and bottom of the bedrock borehole 13 and the hole wall of the loose layer borehole 14 to form an integrated structure;

S5. Grouting between the precast pile 4 and the ground through the second grouting channel 7 to achieve the effect of repeatedly strengthening the precast pile 4. During the construction of the water area corresponding to the bottom with the loose layer 8 and the bedrock layer 9 in order from top to bottom, the loose layer 8 is first drilled by the drill bit of the rig, and then the sediment is discharged. Then drilling the bedrock layer 9 through the drill bit passing through the casing 1 effectively solves the problem that the above waters are difficult to construct because of having the loose layer 8 and the bedrock layer 9. Moreover, the bedrock borehole 13 is filled by injecting cement slurry into the bedrock borehole 13 in advance, and then the precast pile 4 is settled into the bedrock borehole 13; then, through the process of lifting the casing 1, the precast pile 4 is passed through The grouting channel 5 continuously grouts the loose layer 8 and then completes the work of filling and fixing the bedrock layer 9 and the loose layer 8 respectively. The fixation of the bedrock borehole 13 by pre-grouting and re-implantation into the precast pile 4 can effectively allow the cement slurry to have sufficient time to be fixed with the bedrock borehole 13 and the cement slurry can be more adequate under the effect of the impact of the precast pile 4 falling. Penetrating into bedrock layer 9; loose layer 8 is grouted into borehole 14 of loose layer during the casing 1 lifting process, and the gap between precast pile 4 and casing 1 can be effectively filled with cement slurry to complete the above injection. The slurry works so that the cement slurry fully cements the ground around the precast pile 4 and the loose layer borehole 14 together. In addition, through the grouting channels provided on the bottom and side of the precast pile 4, respectively, the cement slurry can be injected into the bedrock borehole 13 and the loose layer borehole 14 from the bottom and side of the precast pile 4, respectively, to make the cement slurry more The gap existing between the precast pile 4 and the bedrock borehole 13 and the gap between the precast pile 4 and the loose layer borehole 14 are evenly and sufficiently filled, so that the precast pile 4 and the ground around the borehole 2 are tightly cemented and fixed to Together form a precast pile foundation. In addition, the application first uses the casing 1 to cooperate with the drilling, then guides the precast pile 4 into the drilling 2, and finally injects the slurry 3 to fix the water formation. The pile foundation construction work of rivers, lakes, seas and other water strata is realized in the above manner. Because the process of building cofferdam islands and removing cofferdams is eliminated, and the above-mentioned casing 1 can also be used repeatedly, the large amount of engineering and long engineering cycle of the cast-in-place bored pile foundation can be solved under the premise of ensuring the construction strength And the problem of high engineering cost. In addition, in the present application, a certain volume of slurry 3 is poured into the steel sleeve 1 before the steel sleeve 1 is pulled out, and the slurry 3 can enter the soil or sand layer at the bottom of the steel sleeve 1 to make the bottom of the borehole 2 The ground is more tightly cemented with the bottom of the precast pile 4. Thus, a solid fixed structure is formed at the bottom of the borehole 2 after the slurry is formed. In addition, when the steel casing 1 is lifted, the slurry 3 will be tightly cemented with the ground around the borehole 2 so that the precast pile 4 and the ground around the sidewall of the drilled hole 2 will be tightly cemented together to form a precast pile foundation. Furthermore, the connection strength of the precast pile 4 with soil, sand and gravel in the foundation foundation environment or the marine engineering environment is improved.

In this implementation, a prefabricated pile includes:

A pile body, which is a reinforced concrete prefabricated pile;

The grouting channel 5 is a grouting tube that is tied to the steel cage of the pile body. The liquid inlet end 11 of the grouting channel 5 extends out of the upper end surface of the pile body. The liquid end 12 extends from the lower end surface of the pile body and the side surface of the pile body.

In the present embodiment, the casing 1 is made of a metal material, and the bottom end of the casing 1 has a toothed structure for cutting the soil.

Of course, the application of the present invention does not specifically limit the position of the upper end of the precast pile 4. In other embodiments, the upper end of the precast pile 4 is located below the water surface of the water area.

Of course, the material composition of the slurry 3 is not specifically limited in the application of the present invention. In other embodiments, the slurry 3 may also be a mortar or a chemical slurry, and two or three of a cement slurry, a mortar, and a chemical slurry. mixture.

Of course, the application of the present invention does not specifically limit the connection manner between the grouting channel 5 and the reinforcing cage. In other embodiments, the grouting channel 5 is preset on the reinforcing cage.

Of course, the application of the present invention does not specifically limit the manner and number of the grouting channels on the precast pile 4. In other embodiments, the precast pile 4 only includes a plurality of first grouting channels 6 located on the bottom surface of the precast pile 4. Or, the precast pile 4 only includes a plurality of second grouting channels 7 located on the side of the precast pile 4.

Of course, the application of the present invention does not specifically limit the role of the second grouting channel 7. In other embodiments, during the process of pulling out the sleeve 1, the first grouting channel 6 and the The second grouting channel 7 continuously grouts into the loose layer borehole 14.

Example 2

The difference between this embodiment and Embodiment 1 is that the engineering implementation environment is a grouting consolidation method for a prefabricated pile with a full-bore drilled guide during the construction of a water area with a bedrock layer 9 at the bottom, including the following steps:

Step S1, sinking the casing 1 to the bedrock layer; sinking a drill bit of the drill rig to the bedrock layer through the inner cavity of the casing 1, and drilling the bedrock layer to drill in the bedrock layer Forming said bedrock borehole 13;

Step S2, at this time, the lower end portion of the casing 1 enters the opening edge of the inner cavity of the bedrock borehole 13, so that the end of the casing 1 is sleeved with the opening edge of the bedrock borehole 13, and the The drill bit of the drilling rig is sequentially removed from the bedrock borehole 13 and the casing 1;

S3, injecting slurry 3 into the borehole 2 in advance; before the slurry 3 is solidified, a precast pile 4 is implanted into the bedrock borehole 13 and the precast pile 4 reaches the bottom of the bedrock borehole 13 ;

S4. Pull out the sleeve 1 so that the internal cavity of the precast pile 4 and the borehole 2 is fixed and cemented into an integrated structure. In this embodiment, the drill bit of the rig drills the bedrock layer 9 through the casing 1, which can effectively solve the problem that the bedrock layer 9 is difficult to construct during the construction of the water area with the bedrock layer 9 at the bottom. Moreover, by injecting the slurry 3 into the bedrock borehole 13 in advance, and then sinking the precast pile 4 into the bedrock borehole 13, the falling impact of the precast pile 4 can effectively make more slurry 3 and the foundation The rock formation 9 is sufficiently permeated and consolidated, so that the slurry 3 sufficiently fills the bottom and sides of the bedrock formation 9.

Example 3

The difference between this embodiment and Embodiment 1 is that the engineering implementation environment is a grouting consolidation method for a prefabricated pile with a full-bore drilled guide during the construction of a water area with a loose layer 8 at the bottom, including the following steps:

In step S1, the casing 1 is sunk to the loose layer 8, the drilling rig drills the loose layer 8 to form a loose layer drill hole 14, and drives the casing 1 into the loose layer 8; Removal of sediment in casing 1;

Step S2, the casing 1 is housed in the loose layer borehole 14;

Step S3, implanting the precast pile 4 into the loose layer drill hole 14 so that the precast pile 4 reaches the bottom of the hole of the loose layer drill hole 14;

S4, lifting the casing 1, during the ascent of the casing 1, through the grouting channel 5 on the prefabricated pile 4 to continue grouting into the loose layer borehole 14; During the process of pulling out the casing 1, the first grouting channel 6 is continuously grouted into the loose hole 14 through the first grouting channel 6, so that the precast pile 4 and The hole wall of the loose layer drill hole 14 and the bottom are fixed and cemented into an integrated structure.

Obviously, the foregoing embodiment is merely an example for clear description, and is not a limitation on the implementation. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. There is no need and cannot be exhaustive for all implementations. However, the obvious changes or variations introduced thereby are still within the protection scope created by the present invention.

Claims

A grouting consolidation method for a full-sleeve drill-guided prefabricated pile, which is characterized in that it is used for foundation construction of a water area project and includes the following steps:

S1. The drilling rig carrying the casing (1) is driven for drilling, and the drilling is performed to a preset hole depth to form a drilling (2);

S2, the sleeve (1) is housed in the borehole (2);

S3. The precast pile (4) is implanted into the borehole (2), so that the precast pile (4) reaches the bottom of the hole of the borehole (2);

S4. Inject slurry (3) into the borehole (2);

S5. Pull out the sleeve (1), so that the precast pile (4) and the inner cavity of the drilled hole (2) are fixed and cemented into an integrated structure.
The method for grouting and consolidation of a prefabricated precast pile with full casing according to claim 1, characterized in that, in step S3, the precast pile (4) is implanted into the borehole (2) so that the The precast pile (4) reaching the bottom of the hole (2) includes the following steps: pre-injecting a slurry (3) into the hole (2); before the slurry (3) solidifies, prefabricating A post (4) is implanted into the borehole (2) to reach the bottom of the hole of the borehole (2).
The method for grouting and consolidation of a prefabricated drilled pile with full casing according to claim 1 or 2, wherein:

The precast pile (4) is prefabricated with a grouting channel (5) for injecting slurry (3) into the borehole (2),

Step S5. The pulling out the casing (1) includes: during the pulling out of the casing (1), through the grouting channel (5) on the precast pile (4) to the casing. Continuous grouting in the borehole (2);

And / or, in step S4, injecting the slurry (3) into the borehole (2) includes: before the casing (1) is pulled out, passing a note on the precast pile (4) The grouting channel (5) grouts into the borehole (2).
The method for grouting and consolidation of a full casing drill-guided precast pile according to claim 3, wherein the grouting channel (5) comprises: a first grouting located on the bottom surface of the precast pile (4) Channel (6);

Step S5. The pulling out the casing (1) includes: continuously pulling the casing (1) into the borehole (2) through the first grouting channel (6). Grouting

And / or, in step S4, injecting the slurry (3) into the borehole (2) includes: before the casing (1) is pulled out, through the first grouting channel (6) Grouting into said borehole (2).
The method for grouting and consolidation of a prefabricated full-hole casing-guided precast pile according to claim 3 or 4, characterized in that the grouting channel (5) comprises: prefabricating the side of the precast pile (4) A second grouting channel (7) for grouting between the pile (4) and the borehole (2);

The method for grouting and consolidation of a prefabricated pile with a full casing drilling guide further includes: Step S6, grouting between the precast pile (4) and the borehole (2) through a second grouting channel (7).
The grouting consolidation method for a full-casing drill-guided prefabricated pile according to any one of claims 1 to 5, characterized in that during the construction of a water area having a bedrock layer (9) at the bottom,

Step S1, driving the drilling rig carrying the casing (1) to perform drilling construction to a predetermined hole depth, including the following steps: sinking the casing (1) to the bedrock layer; The drill rig sinks through the inner cavity of the casing (1) to the bedrock layer, and drills the bedrock layer to form a bedrock borehole (13) in the bedrock layer;

In step S2, removing the drill bit from the bedrock borehole (13), and accommodating the casing (1) in the bedrock borehole (13) includes: sequentially moving the drill bit from the The bedrock borehole (13) and the casing (1) are removed, and the lower end of the casing (1) enters the opening edge of the inner cavity of the bedrock borehole (13),

The borehole (2) includes the bedrock borehole (13).
The grouting consolidation method for a full-casing drill-guided prefabricated pile according to any one of claims 1 to 5, characterized in that it has a loose layer (8) and a bedrock layer (9) in order from the bottom to the bottom. ) During the construction of the waters,

In step S1, driving the drilling rig carrying the casing (1) to perform drilling construction, and drilling construction to a preset hole depth includes:

The casing (1) is sunk to the loose layer (8), and a drilling machine drills the loose layer (8) to drive the casing (1) through the loose layer (8) to Forming a loose layer borehole (14);

Removing the sediment in the casing (1);

Sinking a drill bit of the rig through the inner cavity of the casing (1) to the bedrock layer, drilling the bedrock layer to form a bedrock borehole (13) in the bedrock layer;

Step S2, the step of moving the drill bit out of the borehole (2), and the casing (1) accommodated in the borehole (2) includes: sequentially drilling the drill bit from the bedrock ( 13) and removed from the casing (1), the lower end of the casing (1) enters the opening edge of the inner cavity of the bedrock borehole (13);

The borehole (2) includes the loose layer borehole (14) and the bedrock borehole (13).
The grouting consolidation method for a full-casing drill-guided prefabricated pile according to any one of claims 1 to 5, characterized in that during the construction of a water area with a loose layer (8) at the bottom,

In step S1, the driving of the drilling rig carrying the casing (1) to perform drilling construction to a preset hole depth includes the following steps: sinking the casing (1) to the loose layer (8) ), A rig drills the loose layer (8) to form a loose layer bore (14), and drives the casing (1) into the loose layer (8); The sediment was removed.
The grouting consolidation method for a full-casing drill-guided prefabricated pile according to any one of claims 6 to 8, wherein the upper end of the prefabricated pile (4) is located above the water surface of the water area, and / or The upper end of the prefabricated pile (4) is located below the water surface of the water area.
The grouting consolidation method for a full-casing drill-guided precast pile according to any one of claims 1 to 9, wherein the slurry (3) comprises cement slurry and / or mortar and / or chemical slurry .
A prefabricated pile, comprising

Pile body

The grouting channel (5) is arranged on the pile body, and the liquid inlet end (11) of the grouting channel (5) extends out of the upper end surface of the pile body, and the liquid out of the grouting channel (5) The end (12) extends from the lower end surface of the pile body and / or the side surface of the pile body.
The precast pile according to claim 11, wherein:

The pile body is a reinforced concrete prefabricated pile, and the grouting channel (5) is a grouting pipe prefabricated on the reinforced cage of the pile body.