CN111910627A

CN111910627A - Anchoring device and anchoring method

Info

Publication number: CN111910627A
Application number: CN202010871581.1A
Authority: CN
Inventors: 章钊; 江韩
Original assignee: Nanjing Yangtze River Urban Architectural Design Co Ltd
Current assignee: Nanjing Yangtze River Urban Architectural Design Co Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2020-11-10

Abstract

The invention relates to the field of underground engineering construction, and discloses an anchoring device and an anchoring method. The anchoring device comprises an anchor pipe, an expansion pipe, a lower pressing piece and a limiting piece. The anchor pipe is provided with a grouting hole penetrating through the wall thickness direction; the expansion pipe is sleeved outside the anchor pipe; the lower pressing piece is used for pressing the expansion pipe to expand and deform; the limiting piece is arranged on the lower pressing piece, and when the limiting piece is abutted to the top end of the anchor pipe, the lower pressing piece is pressed in place. The anchoring method comprises the following steps: s1, lowering the anchor pipe with the bottom sleeved with the expansion pipe into a foundation pit dug in advance; s2, pressing the expansion pipe by adopting a lower pressing piece until a limiting piece on the lower pressing piece is abutted against the top end of the anchor pipe, and completely expanding and deforming the expansion pipe; and S3, taking out the lower pressing piece, and injecting cement slurry into the anchor pipe until the anchor pipe and the foundation pit are filled with the cement slurry. The expansion pipe is sleeved on the anchor pipe, the pressing piece is guaranteed to be pressed down in place through the limiting piece, the expansion pipe is guaranteed to be completely expanded and deformed, and the anchoring force of the anchor pipe is further improved. The whole anchoring operation is simple, and the construction efficiency is high.

Description

Anchoring device and anchoring method

Technical Field

The invention relates to the field of underground engineering construction, in particular to an anchoring device and an anchoring method.

Background

When underground engineering construction is carried out, the anchor pipe is adopted to control the settlement and large deformation of soil bodies or surrounding rocks so as to ensure the construction safety. The problems of limited anchoring force of the anchor pipes and more required anchor pipes exist in the construction of high-water-level basements or basements with larger burial depths, and the construction quality and the construction progress are influenced.

Disclosure of Invention

The invention aims to provide an anchoring device and an anchoring method, which have the advantages of large anchoring force of an anchor pipe, high construction quality and high construction speed.

In order to realize the purpose, the following technical scheme is provided:

in a first aspect, there is provided an anchoring device comprising:

the anchor pipe is provided with a grouting hole penetrating through the wall thickness direction;

the expansion pipe is sleeved outside the anchor pipe;

the lower pressing piece is used for pressing the expansion pipe to expand and deform;

the limiting part is arranged on the lower pressing part, and when the limiting part is abutted to the top end of the anchor pipe, the lower pressing part is pressed in place.

As a preferable scheme of the anchoring device, a plurality of connecting holes are formed in the lower pressing member, the plurality of connecting holes are arranged at intervals along a pressing direction of the lower pressing member, and the limiting member is selectively connectable with any one of the connecting holes.

As an optimal scheme of the anchoring device, the anchoring device further comprises a locking piece, after the pressing piece is pressed down in place, the pressing piece is locked on the anchor pipe, and the locking piece is detachably connected with the pressing piece and the anchor pipe.

As an optimal scheme of the anchoring device, a lifting hole is formed in the upper portion of the lower pressing piece, and the lifting hole is used for being clamped into a lifting hook of the lifting device so as to lift the lower pressing piece.

As a preferable scheme of the anchoring device, the lower pressing member is tubular, and the tubular lower pressing member is axially movably sleeved on the anchor pipe.

As a preferable mode of the anchoring device, a flange is provided at a bottom end of the pressing member, and the flange can press against a top end of the expansion pipe.

As a preferable scheme of the anchoring device, an anchoring structure is arranged at the bottom end of the anchor pipe, the bottom end of the expansion pipe abuts against the anchoring structure, and the anchoring structure can be inserted into a soil layer at the bottom of the foundation pit.

As a preferable aspect of the anchoring device, the anchoring structure is an inverted cone.

In a second aspect, there is provided an anchoring method using the above anchoring device, the anchoring method including:

s1, lowering the expansion pipe and the anchor pipe into the foundation pit, wherein the expansion pipe is sleeved on the anchor pipe;

s2, driving the lower pressing piece to press the expansion pipe downwards until the limiting piece on the lower pressing piece is abutted against the top end of the anchor pipe, and expanding and deforming the expansion pipe until the expansion pipe is abutted against the inner wall of the foundation pit;

and S3, taking out the lower pressing piece, and injecting cement slurry into the anchor pipe until the anchor pipe and the foundation pit are filled with the cement slurry.

As a preferable aspect of the anchoring method, after step S2 and before step S3, the method further includes:

adopt the locking piece to lock down the piece on the anchor pipe, after the pressurize preset time, demolish the locking piece to reduce the resilience of expansion pipe.

The invention has the beneficial effects that:

in the anchoring device provided by the invention, the anchor pipe sleeved with the expansion pipe is lowered into a pre-dug foundation pit, the lower pressing piece is used for pressing the expansion pipe to expand and deform, the limiting piece is arranged on the lower pressing piece, and when the limiting piece is abutted against the top end of the anchor pipe, the situation that the lower pressing piece is pressed in place is indicated, so that the expansion pipe is ensured to be fully expanded and deformed. And after the expansion pipe is deformed, removing the lower pressing piece, filling cement slurry into the anchor pipe, and allowing part of the cement slurry to flow into a space between the anchor pipe and the wall of the foundation pit from the grouting hole. And when the cement paste is filled in the anchor pipe and the space between the anchor pipe and the hole wall of the foundation pit, the anchor of the anchor pipe is completed. Through setting up the expansion pipe, improve the anchor power of anchor pipe, especially to the construction of high water level basement or the great basement of buried depth, the anti floating and resistance to plucking ability of anchor pipe is strong, construction quality is high, and simultaneously, the quantity that sets up of reducible anchor pipe saves construction cost. Through setting up the locating part, guarantee to push down the piece and push down and target in place to guarantee that the expansion pipe takes place abundant bulging deformation. The pushing down piece is not pressed down in place, so that the expansion pipe is not deformed sufficiently, and the anchoring force of the anchor pipe is insufficient. The excessive pressing amount of the pressing piece can cause the expansion pipe to deform too much and fail.

According to the anchoring method provided by the invention, the expansion pipe is sleeved on the anchor pipe to improve the anchoring force of the anchor pipe, and the limiting piece is arranged on the lower pressing piece to ensure that the lower pressing piece is pressed in place, so that the expansion pipe is ensured to be fully expanded and deformed, and the anchoring force of the anchor pipe is further improved. The whole anchoring operation is simple, and the construction efficiency is high.

Drawings

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

FIG. 1 is a schematic structural view of an anchor tube according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an expansion pipe (undeformed) provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pressing member according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an anchoring process provided by an embodiment of the present invention.

Reference numerals:

10, a foundation pit; 20-cement slurry;

1-an anchor pipe; 2-expansion pipe; 3-a lower pressing piece; 4-a limiting member;

11-grouting holes; 12-an anchoring structure;

31-a connection hole; 32-lifting holes; 33-flange.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable 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.

As shown in fig. 1 to 4, the present embodiment provides an anchoring device including an anchor pipe 1, an expansion pipe 2, a lower pressing member 3, and a stopper 4. The anchor pipe 1 is provided with a grouting hole 11 penetrating through the wall thickness direction. The expansion pipe 2 is sleeved at the bottom of the anchor pipe 1. The anchor pipe 1 sleeved with the expansion pipe 2 is placed in a foundation pit 10 dug in advance. The lower pressing piece 3 is used for pressing the expansion pipe 2 to expand and deform. The limiting piece 4 is arranged on the lower pressing piece 3, and when the limiting piece 4 is abutted to the top end of the anchor pipe 1, the lower pressing piece 3 is pressed in place, and the expansion pipe 2 is guaranteed to be fully expanded and deformed. After the expansion pipe 2 is deformed, the lower pressing piece 3 is removed, the cement slurry 20 is filled into the anchor pipe 1, and part of the cement slurry 20 flows into the space between the anchor pipe 1 and the hole wall of the foundation pit 10, the inside of the expansion pipe 2 and the space between the expansion pipe 2 and the inner wall of the foundation pit 10 through the grouting holes 11. When the cement paste 20 is filled in the anchor pipe 1, the space between the anchor pipe 1 and the hole wall of the foundation pit 10, the inside of the expansion pipe 2, and the space between the expansion pipe 2 and the inner wall of the foundation pit 10, the anchoring of the anchor pipe 1 is completed.

Through setting up expansion pipe 2, improve anchor pipe 1's anchor power, especially to the construction of high water level basement or the great basement of buried depth, anchor pipe 1's anti superficial and resistance to plucking ability reinforce, construction quality is high, simultaneously, reducible anchor pipe 1 set up quantity, save construction cost. Through setting up locating part 4, guarantee to push down 3 and push down and target in place to guarantee that expansion pipe 2 takes place abundant bulging deformation. The pressing piece 3 is not pressed down in place, so that the expansion pipe 2 is not deformed sufficiently, and the anchoring force of the anchor pipe 1 is insufficient. The hold-down member 3 is pressed down by an excessive amount, which may cause the expansion pipe 2 to deform excessively and fail.

Illustratively, the grouting hole 11 is provided in plurality. A plurality of injected holes 11 are the multiseriate setting, and multiseriate injected hole 11 sets up along anchor pipe 1's circumference interval, and a plurality of injected hole 11 in every row set up along anchor pipe 1's axial interval, and the injected hole 11 dislocation set of adjacent row. The cement slurry 20 injected into the anchor pipe 1 continuously flows downwards in the anchor pipe 1, and simultaneously part of the cement slurry 20 flows to the space between the anchor pipe 1 and the inner wall of the foundation pit 10 through the grouting holes 11. By arranging a plurality of rows of grouting holes 11 arranged at intervals in the circumferential direction of the anchor pipe 1, the grout 20 is uniformly guided to the space between the anchor pipe 1 and the inner wall of the foundation pit 10. The plurality of grouting holes 11 in each row are arranged at intervals along the axial direction of the anchor pipe 1, so that the cement paste 20 can fill the space between the anchor pipe 1 and the inner wall of the foundation pit 10, the interior of the expansion pipe 2 and the space between the expansion pipe 2 and the inner wall of the foundation pit 10 along the axial direction.

Optionally, the diameter of each grouting hole 11 is 5mm-10mm, the distance between adjacent grouting holes 11 in each row is 250mm-500mm, and the distance between the bottommost grouting hole 11 and the bottom end of the anchor pipe 1 is 250mm-500 mm.

Illustratively, the grout holes 11 may be cylindrical holes. Or, the section size of the grouting hole 11 is gradually reduced from inside to outside along the wall thickness direction of the anchor pipe 1, so that the resistance of the cement slurry 20 penetrating through the grouting hole 11 is reduced, and the filling capacity of the cement slurry 20 to the space between the anchor pipe 1 and the inner wall of the foundation pit 10 is improved. The injection hole 11 may be tapered.

Preferably, the bottom of anchor pipe 1 is provided with anchor structure 12, and the bottom of expansion pipe 2 supports and leans on anchor structure 12, and anchor structure 12 inserts in the soil layer of the bottom of foundation ditch 10, prevents to push down 3 at the in-process that pushes down expansion pipe 2 and follow-up pouring, and anchor pipe 1 takes place to rock in foundation ditch 10, guarantees anchor pipe 1's vertical degree. Illustratively, the anchoring structures 12 are reverse tapered to facilitate insertion of the anchoring structures 12 into the earth at the bottom of the foundation pit 10. The anchoring structure 12 is also provided with a through grouting hole 11, so that the connection strength of the anchor pipe 1 and the foundation pit 10 is improved.

Illustratively, the lower press member 3 is provided with a coupling hole 31. The limiting part 4 can be a polished rod, and the limiting part 4 penetrates through the connecting hole 31. Alternatively, the limiting member 4 is a screw or a bolt, and the limiting member 4 is in threaded connection with the connection hole 31.

Optionally, a plurality of connecting holes 31 are provided, the plurality of connecting holes 31 are arranged at intervals along the pressing direction of the pressing member 3, and the limiting member 4 can be selectively matched with any one of the connecting holes 31 to realize the adjustment of the pressing depth of the pressing member 3 so as to adapt to anchor pipes 1 with different heights or expansion pipes 2 with different deformation amounts, so that the adaptability of the pressing member 3 is high.

Optionally, the upper portion of the lower press 3 is provided with a lifting hole 32. The lifting hole 32 is used for being clamped into a lifting hook of a lifting device to lift the lower press piece 3. After the pressure maintaining of the expansion pipe 2 is completed, the lower pressing piece 3 can be lifted out of the foundation pit 10 through the lifting device.

In this embodiment, the lower press member 3 is tubular. The tubular lower pressing piece 3 can be axially movably sleeved on the anchor pipe 1. Through setting the holding down piece 3 to tubulose, the coaxial cover of tubulose holding down piece 3 is located on anchor pipe 1, guarantees that holding down piece 3 exerts the even holding down force of circumference to expansion pipe 2, guarantees that expansion pipe 2 warp evenly. Of course, in other embodiments, the hold-down member 3 may have other shapes such as a rod shape, so long as it can extend into the space between the anchor pipe 1 and the foundation pit 10 to hold down the expansion pipe 2.

Preferably, the bottom end of the lower pressing member 3 is provided with a flange 33, and the flange 33 is pressed against the top end of the expansion pipe 2, so that the contact area between the lower pressing member 3 and the expansion pipe 2 is increased, the deformation of the expansion pipe 2 is promoted, and the pressing operation of the lower pressing member 3 is more labor-saving.

Optionally, the anchoring device further comprises a locking member. After the lower pressing piece 3 is pressed down to the right position, the locking piece locks the lower pressing piece 3 and the anchor pipe 1 so as to maintain the pressure of the expansion pipe 2. The lock piece can be dismantled with pushing down piece 3 and anchor pipe 1 and be connected, after the pressurize preset time, demolishs the lock piece, takes out and pushes down piece 3. Through the pressure maintaining preset time of the expansion pipe 2, the resilience of the expansion pipe 2 is reduced, and the anchoring force of the anchor pipe 1 is ensured. The pushing-down piece 3 can be driven to repeatedly move up and down for a plurality of times, so that the pushing-down piece 3 and the anchor pipe 1 are locked by the locking piece after the expansion pipe 2 is completely deformed.

Illustratively, the locking member is a screw or bolt. Be provided with the via hole on the lower pressure member 3, be provided with the screw hole on the anchor pipe 1, the lock piece passes behind the via hole and screw hole screw-thread fit on the anchor pipe 1 to with lower pressure member 3 and anchor pipe 1 locking. Or, only set up the screw hole on casting die 3 down, locking piece and screw hole screw-thread fit, the locking piece passes the screw hole simultaneously and supports in the lateral wall of anchor pipe 1 in top to with casting die 3 and the locking of anchor pipe 1 down.

In the anchoring device provided by the embodiment, the expansion pipe 2 is arranged, so that the anchoring force of the anchor pipe 1 is improved, particularly, for the construction of a high-water-level basement or a basement with a large buried depth, the anchor pipe 1 is high in anti-floating and anti-pulling capacity and construction quality, meanwhile, the arrangement number of the anchor pipes 1 can be reduced, and the construction cost is saved. Through setting up locating part 4, guarantee to push down 3 and push down and target in place to guarantee that expansion pipe 2 takes place abundant bulging deformation. The pressing piece 3 is not pressed down in place, so that the expansion pipe 2 is not deformed sufficiently, and the anchoring force of the anchor pipe 1 is insufficient. The hold-down member 3 is pressed down by an excessive amount, which may cause the expansion pipe 2 to deform excessively and fail.

Referring to fig. 4, the present embodiment further provides an anchoring method using the above-mentioned anchoring device, the anchoring method including:

s1, lowering the expansion pipe 2 and the anchor pipe 1 into the foundation pit 10 dug in advance, and sleeving the expansion pipe 2 on the anchor pipe 1.

When the foundation pit 10 is excavated, firstly, the construction site is leveled, and the measurement and positioning are carried out at the position of the foundation pit 10 where the anchor pipe 1 needs to be arranged, and the drilling position is marked. Before drilling operation, the angle of the drilling machine is adjusted, drilling is carried out at the position marked by the anchor rod machine, and the drilling machine is started until the drilling machine drills to the preset depth. And cleaning the hole after the drilling is finished. Thereafter, the anchor pipe 1 is lowered into the foundation pit 10. The anchoring structure 12 at the bottom of the anchor pipe 1 is inserted into the soil layer at the bottom of the foundation pit 10.

S2, driving the lower pressing piece 3 to press the expansion pipe 2 downwards until the limiting piece 4 on the lower pressing piece 3 abuts against the top end of the anchor pipe 1, and expanding and deforming the expansion pipe 2 until the expansion pipe abuts against the inner wall of the foundation pit 10.

Adopt the locking piece to lock down piece 3 on anchor pipe 1, after 2 pressurize preset times to the expansion pipe, demolish the locking piece to reduce the resilience of expansion pipe 2.

S3, taking out the lower pressing piece 3, and injecting cement slurry 20 into the anchor pipe 1 until the cement slurry 20 fills the anchor pipe 1 and the space between the anchor pipe 1 and the hole wall of the foundation pit 10. Completing the anchoring construction of one anchor pipe 1.

In the anchoring method provided by the embodiment, the expansion pipe 2 is sleeved on the anchor pipe 1 to improve the anchoring force of the anchor pipe 1, and the limiting part 4 is arranged on the lower pressing part 3 to ensure that the lower pressing part 3 is pressed down in place, so that the expansion pipe 2 is ensured to be completely expanded and deformed, and the anchoring force of the anchor pipe 1 is further improved. The whole anchoring operation is simple, and the construction efficiency is high.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An anchoring device, comprising:

the anchor pipe (1) is provided with a grouting hole (11) penetrating through the wall thickness direction;

the expansion pipe (2) is sleeved outside the anchor pipe (1);

the pressing piece (3) is used for pressing the expansion pipe (2) to expand and deform;

the limiting part (4) is arranged on the lower pressing part (3), and when the limiting part (4) is abutted to the top end of the anchor pipe (1), the lower pressing part (3) is pressed in place.

2. The anchoring device as recited in claim 1, wherein a plurality of connecting holes (31) are provided in the lower member (3), a plurality of connecting holes (31) are provided at intervals in a pressing-down direction of the lower member (3), and the retaining member (4) is selectively connectable to any one of the connecting holes (31).

3. The anchoring device as recited in claim 1, further comprising a locking member, wherein after the pressing member (3) is pressed to the proper position, the pressing member (3) is locked on the anchor tube (1) by the locking member, and the locking member is detachably connected with the pressing member (3) and the anchor tube (1).

4. Anchoring device according to claim 1, characterised in that the upper part of the lower press-piece (3) is provided with lifting holes (32), which lifting holes (32) are intended to be snapped into the hooks of a lifting device for lifting the lower press-piece (3).

5. Anchoring device according to claim 1, characterised in that the hold-down member (3) is tubular, the tubular hold-down member (3) being axially displaceably mounted on the anchor tube (1).

6. Anchoring device according to claim 5, characterised in that the bottom end of the hold-down (3) is provided with a flange (33), which flange (33) can press against the top end of the expansion tube (2).

7. Anchoring device according to any of the claims 1-6, characterized in that the bottom end of the anchor tube (1) is provided with an anchoring structure (12), against which anchoring structure (12) the bottom end of the expansion tube (2) rests, which anchoring structure (12) can be inserted into the ground at the bottom of the foundation pit (10).

8. Anchoring device according to claim 7, characterised in that the anchoring structure (12) is of inverted cone shape.

9. An anchoring method using the anchoring device according to any one of claims 1 to 8, the anchoring method comprising:

s1, lowering the expansion pipe (2) and the anchor pipe (1) into the foundation pit (10), and sleeving the expansion pipe (2) on the anchor pipe (1);

s2, driving the pressing piece (3) to press the expansion pipe (2) downwards until the limiting piece (4) on the pressing piece (3) is abutted against the top end of the anchor pipe (1), and expanding the expansion pipe (2) to abut against the inner wall of the foundation pit (10);

s3, taking out the lower pressing piece (3), and injecting cement slurry (20) into the anchor pipe (1) until the anchor pipe (1) and the foundation pit (10) are filled with the cement slurry (20).

10. The anchoring method as claimed in claim 9, further comprising, after step S2 and before step S3:

adopt the locking piece to lock down piece (3) on anchor pipe (1), after the pressurize preset time, demolish the locking piece to reduce the resilience of expansion pipe (2).