阅读说明：本技术 全套管钻孔导引预制桩的注浆固结方法及其预制桩 (Grouting consolidation method for full-casing drilling guide precast pile and precast pile thereof ) 是由 高永光 高云飞 于 2019-06-14 设计创作，主要内容包括：一种全套管钻孔导引预制桩的注浆固结方法,包括以下步骤：S1,驱动携带有套管(1)的钻机进行钻孔施工,钻孔施工至预设孔深,形成钻孔(2)；S2,套管(1)容置在钻孔(2)中；S3,将预制桩(4)植入钻孔(2),以使预制桩(4)到达钻孔(2)的孔底；S4,向钻孔(2)内注入浆液(3)；S5,拔出套管(1),以使预制桩(4)和钻孔(2)的内腔固定胶结成一体结构。还提供了一种预制桩,包括桩身和设置在桩身上的注浆通道(5),注浆通道(5)的进液端(11)延伸出桩身的上端面,注浆通道(5)的出液端(12)延伸出桩身的下端面和/或桩身的侧面。(A grouting consolidation method of a full-casing drilling guide precast pile comprises the following steps: s1, driving a drilling machine carrying the casing (1) to carry out drilling construction, and carrying out drilling construction to a preset hole depth to form a drill hole (2); s2, the sleeve (1) is accommodated in the drill hole (2); s3, implanting the precast pile (4) into the drilled hole (2) so that the precast pile (4) reaches the bottom of the drilled hole (2); s4, injecting slurry (3) into the drill hole (2); and S5, pulling out the sleeve (1) to fix and glue the precast pile (4) and the inner cavity of the drill hole (2) into an integral structure. The precast pile comprises a pile body and a grouting channel (5) arranged on the pile body, wherein a liquid inlet end (11) of the grouting channel (5) extends out of the upper end face of the pile body, and a liquid outlet end (12) of the grouting channel (5) extends out of the lower end face of the pile body and/or the side face of the pile body.)

1. A grouting consolidation method for a full-casing drilling guide precast pile is characterized by being used for foundation construction of water area engineering and comprising the following steps:

s1, driving a drilling machine carrying the casing (1) to carry out drilling construction, and carrying out drilling construction to a preset hole depth to form a drill hole (2);

s2, the casing (1) being housed in the borehole (2);

s3, implanting a precast pile (4) into the drilled hole (2) so that the precast pile (4) reaches the bottom of the drilled hole (2);

s4, injecting slurry (3) into the drill hole (2);

and S5, pulling out the sleeve (1) to fixedly glue the precast pile (4) and the inner cavity of the drilling hole (2) into an integral structure.

2. The method for grouting and consolidating a full casing drill-guided precast pile according to claim 1, wherein said step S3 of implanting a precast pile (4) into said drill hole (2) to make the precast pile (4) reach the bottom of the drill hole (2) comprises the steps of: pre-injecting a slurry (3) into the borehole (2); before the grout (3) is solidified, a precast pile (4) is implanted into the borehole (2) to the bottom of the borehole (2).

3. The method for grouting and consolidating a full casing drill guide precast pile according to claim 1 or 2,

a grouting channel (5) for injecting grout (3) into the drill hole (2) is prefabricated on the precast pile (4),

step S5, the extracting the cannula (1), comprising: continuously grouting into the drill hole (2) through a grouting channel (5) on the precast pile (4) in the process of pulling out the casing (1);

and/or, in step S4, injecting a slurry (3) into the borehole (2), including: before the casing pipe (1) is pulled out, grouting is carried out in the drilling hole (2) through a grouting channel (5) on the precast pile (4).

4. A method for grouting consolidation of a full casing drill guide precast pile according to claim 3, wherein the grouting channel (5) comprises: a first grouting channel (6) positioned at the bottom surface of the precast pile (4);

step S5, the extracting the cannula (1), comprising: during the process of pulling out the casing (1), continuously grouting into the drill hole (2) through a first grouting channel (6);

and/or, in step S4, injecting a slurry (3) into the borehole (2), including: grouting the borehole (2) through the first grouting channel (6) before extracting the casing (1).

5. A method for grouting consolidation of a full casing drill guide precast pile according to claim 3 or 4, characterized in that the grouting channel (5) comprises: a second grouting channel (7) which is positioned at the side part of the precast pile (4) and used for grouting between the precast pile (4) and the drilled hole (2);

the grouting consolidation method for the full-casing drilling guide precast pile further comprises the following steps: and step S6, grouting between the precast pile (4) and the drilling hole (2) through the second grouting channel (7).

6. The method for grouting consolidation of a full casing drill guide precast pile according to any of claims 1 to 5, wherein, during construction of water having a bedrock layer (9) at the bottom,

step S1, the drilling machine with the sleeve (1) is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps: -lowering the casing (1) to the basement formation; sinking a drill bit of the drilling machine to the bedrock stratum through the inner cavity of the casing (1), and drilling the bedrock stratum to form a bedrock borehole (13) in the bedrock stratum;

a step S2 of moving the drill bit of the drilling machine out of the bedrock borehole (13), the casing (1) being received in the bedrock borehole (13), comprising: the drill bit of the drilling machine is moved out of the bedrock drill hole (13) and the sleeve (1) in sequence, the lower end of the sleeve (1) enters the opening edge of the inner cavity of the bedrock drill hole (13),

the borehole (2) comprises the bedrock borehole (13).

7. The grouting consolidation method of the whole casing drilling guide precast pile according to any one of claims 1 to 5, characterized in that, in the water construction process with the unconsolidated layer (8) and the bedrock layer (9) at the bottom in sequence from top to bottom,

step S1, the drilling machine with the sleeve (1) is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps:

sinking the casing (1) to the unconsolidated formation (8), the drilling machine drilling the unconsolidated formation (8) to drive the casing (1) through the unconsolidated formation (8) to form a unconsolidated formation borehole (14);

removing silt in the casing (1);

sinking a drill bit of the drilling machine to the bedrock stratum through the inner cavity of the casing (1), and drilling the bedrock stratum to form a bedrock borehole (13) in the bedrock stratum;

step S2, the moving the drill head of the drilling machine out of the borehole (2), the casing (1) being received in the borehole (2), comprising: sequentially moving the drill bit of the drilling machine out of the bedrock drill hole (13) and the sleeve (1), wherein the lower end of the sleeve (1) enters the opening edge of the inner cavity of the bedrock drill hole (13);

the borehole (2) comprises the unconsolidated formation borehole (14) and the bedrock borehole (13).

8. The grouting consolidation method of the full casing drilling guide precast pile according to any one of claims 1 to 5, characterized in that, during the construction of water area with a loose layer (8) at the bottom,

step S1, the drilling machine with the sleeve (1) is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps: sinking the casing (1) to the unconsolidated formation (8), drilling the unconsolidated formation (8) by a drilling machine to form a unconsolidated formation drill hole (14), and driving the casing (1) into the unconsolidated formation (8); and removing the silt in the casing (1).

9. The method for grouting consolidation of a full casing drill guide precast pile according to any of claims 6 to 8, characterized in that the upper end of the precast pile (4) is located above the water surface of the water body and/or the upper end of the precast pile (4) is located below the water surface of the water body.

10. The method for grouting consolidation of a full casing drill guided precast pile according to any of claims 1 to 9, characterized in that the grout (3) comprises cement slurry and/or mortar and/or chemical slurry.

11. A precast pile is characterized by comprising

A pile body;

the grouting channel (5) is arranged on the pile body, a liquid inlet end (11) of the grouting channel (5) extends out of the upper end face of the pile body, and a liquid outlet end (12) of the grouting channel (5) extends out of the lower end face of the pile body and/or the side face of the pile body.

12. A pre-pile as claimed in claim 11,

the pile body is a reinforced concrete precast pile, and the grouting channel (5) is a grouting pipe which is precast on a reinforcement cage of the pile body.

Technical Field

The invention relates to the technical field of foundation foundations, in particular to a grouting consolidation method of a full-casing drilling guide precast pile and a precast pile thereof.

Background

At present, in the field of foundation engineering of water area engineering, particularly in the technical field of ocean engineering, pile foundations in rivers, lakes and seas are mostly cast-in-situ bored piles or hammered steel pipe piles, and the most common cast-in-situ bored pile construction scheme and method is cofferdam island construction or construction work completed by the aid of steel pile casings. The cofferdam island-building is also called as island-building core filling, and in order to solve the problem of difficult construction in marine environment, the region surrounded by the cofferdam needs to be filled with soil, sand and sand gravel, and then the drilling and pouring process is carried out. Moreover, the cofferdam island needs to be dismantled after the construction of the cast-in-situ bored pile is completed, so that the construction work amount is very large by adopting the cofferdam island building method, and the problems of long project period and high project cost are solved. Similarly, the hammered steel pipe pile is constructed by hammering the steel pipe pile into a foundation of a water area, so that when the hammered steel pipe pile encounters a hard foundation rock, the end of the hammered steel pipe pile is curled and even cannot be driven into the foundation rock, and the steel pipe of the hammered steel pipe pile cannot be taken out, so that not only is the problem of corrosion easily caused, but also the problems of high construction cost and large construction workload of the construction method are caused.

Disclosure of Invention

Therefore, the invention aims to provide a grouting consolidation method of a full-casing drilling guide precast pile and the precast pile thereof, so as to solve the problems of large construction quantity of the drilling cast-in-place pile foundation, long construction period and high construction cost in the foundation construction of the underwater foundation under various stratum conditions, particularly in the foundation construction of ocean engineering in the prior art. The application provides a grouting consolidation method of a full-casing drilling guide precast pile, which is used for foundation construction of water area engineering and comprises the following steps:

s1, driving a drilling machine with a sleeve to carry out drilling construction, wherein the drilling construction is carried out to a preset hole depth;

s2, the sleeve is accommodated in the borehole;

s3, implanting a precast pile into the drilled hole so that the precast pile reaches the bottom of the drilled hole;

s4, injecting slurry into the drilled hole;

and S5, pulling out the sleeve to fixedly glue the precast pile and the inner cavity of the drilled hole into a whole structure.

Step S3, implanting the precast pile into the drilled hole so that the precast pile reaches the bottom of the drilled hole, comprising the steps of: injecting grout into the drill hole in advance; before the slurry solidifies, a precast pile is implanted into the borehole to the bottom of the borehole.

A grouting channel for injecting grout into the drill hole is prefabricated on the precast pile,

step S5, the extracting the sleeve includes: continuously grouting into the drill hole through a grouting channel on the precast pile in the process of pulling out the sleeve;

and/or, in step S4, injecting a slurry into the borehole, including: and grouting the drilling hole through a grouting channel on the precast pile before pulling out the sleeve.

The slip casting passageway includes: the first grouting channel is positioned on the bottom surface of the precast pile;

step S5, the extracting the sleeve includes: continuously grouting into the drill hole through the first grouting channel and/or the second grouting channel in the process of pulling out the sleeve;

and/or, in step S4, injecting a slurry into the borehole, including: grouting the borehole through the first grouting passage before extracting the casing.

During construction of a water area having a basement layer at the bottom,

step S1, the drilling machine with the sleeve is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps: sinking the casing to the basement formation; sinking a drill bit of a drilling rig through the casing bore to the bedrock formation, drilling the bedrock formation to form the bedrock borehole in the bedrock formation;

step S2, moving the drill bit of the drilling machine out of the bedrock borehole in which the casing is received, comprising: sequentially moving the drill bit of the drilling machine out of the bedrock drill hole and the sleeve, wherein the lower end of the sleeve enters the opening edge of the inner cavity of the bedrock drill hole,

the borehole comprises the bedrock borehole.

In the process of constructing a water area with a loose layer and a bed rock layer at the bottom from top to bottom, the loose layer is a loose stratum such as silt;

step S1, the drilling machine with the sleeve is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps:

sinking the casing to the unconsolidated formation, and drilling the unconsolidated formation by a drilling machine to drive the casing through the unconsolidated formation to form a unconsolidated formation borehole;

removing the silt in the casing;

sinking a drill bit of a drilling rig through the casing bore to the bedrock formation, drilling the bedrock formation to form the bedrock borehole in the bedrock formation;

step S2, moving the drill bit of the drill out of the borehole, the casing being received in the borehole, comprising: sequentially moving a drill bit of the drilling machine out of the bedrock drill hole and the sleeve, wherein the lower end of the sleeve enters the opening edge of the inner cavity of the bedrock drill hole;

the borehole includes the unconsolidated formation borehole and the bedrock borehole.

In the process of constructing a water area with a loose layer at the bottom,

step S1, the drilling machine with the sleeve is driven to carry out drilling construction, and the drilling construction is carried out to a preset hole depth, and the method comprises the following steps: sinking the sleeve to the unconsolidated formation, drilling the unconsolidated formation by a drilling machine to form a unconsolidated formation drill hole, and driving the sleeve to enter the unconsolidated formation; and removing the silt 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 comprises cement slurry and/or mortar and/or chemical slurry.

A precast pile comprises

A pile body;

and the grouting channel is arranged on the pile body, the liquid inlet end of the grouting channel extends out of the upper end face of the pile body, and the liquid outlet end of the grouting channel extends out of the lower end face of the pile body and/or the side face of the pile body.

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

The technical scheme of the invention has the following advantages:

1. the invention provides a grouting consolidation method of a full-casing drilling guide precast pile, which is used for foundation construction of water area engineering and comprises the following steps: s1, driving a drilling machine with a sleeve to carry out drilling construction, wherein the drilling construction is carried out to a preset hole depth; s2, the sleeve is accommodated in the borehole; s3, implanting a precast pile into the drilled hole so that the precast pile reaches the bottom of the drilled hole; s4, injecting slurry into the drilled hole; and S5, pulling out the sleeve to fixedly glue the precast pile and the inner cavity of the drilled hole into a whole structure. In order to adapt to the stratum of various water projects, in particular to the ocean engineering environment which needs to be constructed on the water surface of rivers, lakes and seas, the construction of the stratum of the water area is realized by the way of drilling through the matching of the casing pipes, guiding the precast piles into the bottoms of the drilled holes and finally injecting slurry for fixation. Because the foundation of the water area engineering has higher requirements on the construction strength, the drilling can be assisted by the sleeve to adapt to different underwater stratum structures, and the stability and the reliability of the foundation construction of the water area engineering can be effectively ensured by guiding the precast pile into the hole bottom of the drilled hole. The pile foundation construction work of water area strata such as rivers, lakes and seas is realized through the mode. Because the working procedures of cofferdam building and cofferdam dismantling are omitted, and the sleeve can be recycled, the problems of large engineering quantity, long engineering period and high engineering cost of the water drilling cast-in-place pile foundation are solved on the premise of ensuring the construction strength.

2. The method for grouting and consolidating the full-casing drill hole guide precast pile, provided by the invention, comprises the following steps of implanting the precast pile into the drill hole so as to enable the precast pile to reach the bottom of the drill hole at step S3: injecting grout into the drill hole in advance; before the slurry solidifies, a precast pile is implanted into the borehole to the bottom of the borehole. The precast pile and the grout in the drill hole can be fully cemented by injecting the grout in the drill hole in advance before the precast pile is implanted in the drill hole. Furthermore, the impact force of the drop of the precast pile also effectively causes the grout to enter the bottom of the borehole, thereby forming a solid fixed head at the bottom of the borehole 2 with a large volume.

3. The invention provides a grouting consolidation method of a full casing drilling guide precast pile, a grouting channel for injecting grout into a drilling hole is pre-formed on the precast pile, and the step S5 is that the casing is pulled out, and the grouting consolidation method comprises the following steps: continuously grouting into the drill hole through a grouting channel on the precast pile in the process of pulling out the sleeve; in the process of pulling out the casing, the slurry can simply and conveniently flow into the drilled hole through the grouting channel of the precast pile so as to fill the gap generated in the process of pulling out the casing. In addition, by the mode, the precast pile and the stratum around the drilled hole can be tightly cemented and fixed so as to be suitable for various stratums, the pulling-out process of the sleeve can be smoother, the operation difficulty is reduced, and the problems of large engineering quantity, long engineering period and high engineering cost of the existing water drilling cast-in-place pile foundation are solved. In step S4, the injecting slurry into the borehole includes: and grouting the drilling hole through a grouting channel on the precast pile before pulling out the sleeve. Before the casing pipe is pulled out, grout is injected into the drilled hole through the grouting channel, or grout is directly injected into the drilled hole, the operation is simple and convenient, the precast pile and the stratum around the drilled hole 2 can be tightly cemented and fixed together to form a precast pile foundation, and then the connection strength of the precast pile, soil and gravel in the ocean engineering environment is improved.

4. The invention provides a grouting consolidation method of a full-casing drilling guide precast pile, wherein a grouting channel comprises the following components: the first grouting channel is positioned on the bottom surface of the precast pile; the grouting channels are respectively arranged on the bottom surface and the side surface of the precast pile, so that grout can be respectively injected into the drilled holes from the bottom surface of the precast pile, gaps between the precast pile and the drilled holes are more uniformly and fully filled with the grout, and the precast pile and the stratum around the drilled holes 2 are tightly cemented and fixed together to form a precast pile foundation.

5. The invention provides a grouting consolidation method of a full casing drilling guide precast pile, which comprises the following steps of S1, in the process of constructing a water area with a foundation layer at the bottom, driving a drilling machine with a casing to perform drilling construction, wherein the drilling construction is carried out to a preset hole depth: sinking the casing to the basement formation; sinking a drill bit of the drilling machine to the bedrock stratum through the inner cavity of the casing, and drilling the bedrock stratum to form the bedrock borehole in the bedrock stratum. Step S2, moving the drill bit of the drilling machine out of the bedrock borehole in which the casing is received, comprising: and sequentially moving out the drill bit of the drilling machine from the bedrock drilling hole and the sleeve, wherein the lower end of the sleeve enters the opening edge of the inner cavity of the bedrock drilling hole, and the drilling hole comprises the bedrock drilling hole. The drill bit of the drilling machine penetrates through the casing to carry out drilling construction on the foundation stratum, and the problem that the foundation stratum is difficult to construct in the construction process of the water area with the foundation stratum at the bottom can be effectively solved. And by the mode of injecting the grout into the bedrock drill hole in advance and then settling the precast pile into the bedrock drill hole, more grout can be effectively and fully infiltrated and consolidated with the bedrock layer through the descending impact action of the precast pile, so that the grout can fully fill the bottom and the side part of the bedrock layer.

6. The grouting consolidation method of the whole casing drilling guide precast pile provided by the invention, in the water area construction process that the bottom is sequentially provided with a loose layer and a bedrock layer from top to bottom, step S1, the drilling machine with the casing is driven to carry out drilling construction, and the drilling construction is carried out to the preset hole depth, and the grouting consolidation method comprises the following steps: sinking the casing to the unconsolidated formation, and drilling the unconsolidated formation by a drilling machine to drive the casing through the unconsolidated formation to form a unconsolidated formation borehole; removing the earth, stone, silt and sand in the sleeve; sinking a drill bit of the drilling machine to the bedrock stratum through the inner cavity of the casing, and drilling the bedrock stratum to form the bedrock borehole in the bedrock stratum. Step S2, moving the drill bit of the drill out of the borehole, the casing being received in the borehole, comprising: sequentially moving a drill bit of the drilling machine out of the bedrock drill hole and the sleeve, wherein the lower end of the sleeve enters the opening edge of the inner cavity of the bedrock drill hole; the borehole includes the unconsolidated formation borehole and the bedrock borehole. In the construction process of the water area with the loose layer and the bed rock layer sequentially arranged from top to bottom corresponding to the bottom, the loose layer is drilled by a drill bit of a drilling machine, and then silt is discharged. And then the drill bit penetrating through the casing is used for drilling the foundation stratum, so that the problem that the construction of the water area is difficult due to the loose layer and the foundation stratum is effectively solved. In addition, slurry is injected into the bedrock drill hole in advance, and then the precast pile is settled and enters the bedrock drill hole to fill the bedrock drill hole; and then, in the process of lifting the casing, the grouting channel of the precast pile continuously injects slurry to the unconsolidated formation, so that the work of filling and fixing the foundation layer and the unconsolidated formation is respectively completed. The bedrock drill hole is fixed by adopting a fixation mode of pre-grouting and then implanting the precast pile, so that the slurry can be effectively cemented and fixed with the bedrock drill hole for a sufficient time, and the slurry can be more fully infiltrated into a bedrock layer under the action of the descending impact force of the precast pile; the loose layer adopts a mode of grouting into the drill hole of the loose layer in the casing lifting process, so that the gap between the precast pile and the casing can be effectively filled with the grout to complete the grouting work, and the grout can fully glue and fix the precast pile and the stratum around the drill hole of the loose layer together.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the steps for installing a full casing of a body of water having a unconsolidated formation and a bedrock formation in accordance with the present invention;

FIG. 2 is a schematic representation of a pre-grouting step of a body of water having a unconsolidated formation and a bedrock formation, as provided by the present invention, toward the bedrock formation;

FIG. 3 is a schematic view of the steps of sinking a precast pile to the bottom of a pre-grouted borehole in a body of water having a unconsolidated formation and a bedrock formation in accordance with the present invention;

FIG. 4 is a schematic illustration of the steps for removing a full casing from a body of water having a unconsolidated formation and a bedrock formation in accordance with the present invention;

FIG. 5 is a schematic view of a connection structure of a precast pile and the bottom of a water area after a grouting consolidation process of a full-casing drilling guide precast pile of the water area with a unconsolidated formation and a bedrock formation is completed;

fig. 6 is a schematic structural view of the precast pile provided by the present invention sinking to the bottom of the drilled hole;

fig. 7 is a schematic view of a connection structure of a precast pile and a foundation environment when a full casing is taken out after a full casing drilling and grouting process is completed.

Description of reference numerals:

1-a sleeve; 2, drilling; 3-slurry; 4-precast pile; 5-grouting a channel; 6-a first grouting channel; 7-a second grouting channel; 8-a loose layer; a 9-basal rock layer; 10-water surface; 11-liquid inlet end; 12-liquid outlet end; 13-drilling of bedrock; and 14-loose layer drilling.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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