CN116497809A - Self-drilling prestress hollow bottom-enlarging anchor rod with built-in blade - Google Patents

Abstract

The invention discloses a self-drilling prestress hollow bottom-expanding anchor rod with a bottom-expanding concealed blade, which comprises an anchor head and an anchor rod body in transmission connection with the anchor head; at least two guide holes communicated with the inside of the anchor head are uniformly formed in the anchor head, a bottom expanding blade is slidably arranged in the guide holes, one end of the bottom expanding blade is retracted into the anchor head, and the other end of the bottom expanding blade does not exceed the orifice of the guide hole; when the anchor head is positioned at the bottom of the anchor hole, the anchor body rotates and axially advances to eject the bottom expanding blade out of the guide hole, and when the bottom expanding blade is in place, the anchor body rotates to drive the anchor head and the bottom expanding blade to synchronously rotate to expand the bottom. According to the invention, the anchor head is in threaded connection with the anchor body, and the stop part is arranged at the end part of the anchor body so as to realize drilling when the anchor body rotates reversely, and the bottom expanding blade are ejected when the anchor body rotates positively; drilling driving of the anchor head and rotary driving of the bottom expanding blade and the bottom expanding are respectively realized through the screw thread pair; the anchor rod integrates anchor hole drilling, bottom expanding, prestressing and grouting.

Description

Self-drilling prestress hollow bottom-enlarging anchor rod with built-in blade

Technical Field

The invention relates to the technical field of anchor rods, in particular to a self-drilling type prestress hollow bottom-expanding anchor rod with a built-in blade.

Background

The rear bottom expanding anchor bolt has an anchoring effect through a locking key between the bottom expanding hole of the anchor bolt and the anchor bolt expanding piece. The post-expanding bottom anchor bolt comprises a self-cutting bottom anchor bolt and a pre-expanding bottom anchor bolt. The installation of the pre-expanded bottom anchor bolt requires a special reaming bit for operation, the special reaming bit has high manufacturing cost, is unfavorable for construction cost control, and has unstable reaming size due to manual operation. The self-cutting bottom anchor bolt is only required to drill a straight hole first, the anchor bolt is connected with a hammering drill bit after being put into the anchor bolt, and the concrete is cut to form reaming by means of a bottom reaming bit at the end of the anchor bolt, so that the reaming and the installation are carried out simultaneously, and the process is simple; the reaming shape and the expanding shape of the anchor bolt end can be completely matched, so that the anchor bolt is safer and more reliable; in addition, a special reaming bit is not needed, and the construction cost is low.

The two anchors have the structural characteristics that the sleeve needs to be designed so as to ensure that the expansion head can be expanded to form the bottom expanding blade when the sleeve moves relative to the expansion head. Such as the one disclosed in CN203348259U, CN 217682658U. Such a structure is suitable only for use when the hole depth is shallow, and if the hole depth is long, the sleeve size becomes correspondingly long, and the overall production cost of the anchor bolt increases.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a self-drilling type prestress hollow bottom-expanding anchor rod with a built-in blade, which is characterized in that an anchor head is in threaded connection with an anchor rod body, a stop part is arranged at the end part of the anchor rod body to realize drilling when the anchor rod body rotates reversely, and the bottom-expanding blade and the bottom are ejected when the anchor rod rotates positively; drilling driving of the anchor head and rotary driving of the bottom expanding blade and the bottom expanding are respectively realized through the screw thread pair; the anchor rod integrates anchor hole drilling, bottom expanding and grouting.

The aim of the invention is realized by the following technical scheme:

the self-drilling type prestress hollow bottom-expanding anchor rod with the built-in blade comprises an anchor head and an anchor rod body in transmission connection with the anchor head;

at least two guide holes communicated with the inside of the anchor head are uniformly formed in the anchor head, a bottom expanding blade is slidably arranged in the guide holes, one end of the bottom expanding blade is retracted into the anchor head, and the other end of the bottom expanding blade does not exceed the orifice of the guide hole;

when the anchor head is positioned at the bottom of the anchor hole, the anchor body rotates and axially advances to eject the bottom expanding blade out of the guide hole, and when the bottom expanding blade is in place, the anchor body rotates to drive the anchor head and the bottom expanding blade to synchronously rotate to expand the bottom.

Further, the anchor head is internally provided with a communicated installation cavity and a threaded hole matched with the external threads of the anchor rod in sequence, and one end of the bottom expanding blade is retracted into the installation cavity.

Further, the anchor rod body is a hollow anchor rod, and the anchor head is provided with grouting holes.

Further, the anchor head is a drill bit;

one end of the anchor rod body extends into the mounting cavity, and a retaining part is arranged at the end part of the anchor rod body;

the stop is used for preventing the end of the anchor rod body from exiting the mounting cavity.

Further, the retaining portion is of a frustum-shaped structure, and the diameter of the large-size end of the retaining portion is larger than the aperture of the threaded hole.

Further, the large-size end of the retaining part is connected with a screw rod, and the screw rod stretches into the anchor rod body to be in threaded connection with the anchor rod body;

the retaining portion is provided with a deformation abdicating groove along the axial direction of the anchor rod.

Further, the bottom expanding blade is of an arc-shaped structure.

The beneficial effects of the invention are as follows:

1) The invention can be suitable for deep hole bottom expansion by only increasing the size of the anchor head, and the pushing-out and bottom expansion of the bottom expansion blade can be realized by the same equipment, and the bottom expansion process is simple and quick.

2) According to the invention, the anchor head is in threaded connection with the anchor body, and the stop part is arranged at the end part of the anchor body so as to realize drilling when the anchor body rotates reversely, and the bottom expanding blade are ejected when the anchor body rotates positively; drilling driving of the anchor head and rotary driving of the bottom expanding blade and the bottom expanding are respectively realized through the screw thread pair; the anchor rod integrates anchor hole drilling, bottom expanding, prestressing and grouting.

3) By arranging the retaining part and the anchor rod body into a split structure, the installation of the anchor rod body and the anchor head is facilitated, and the integral structure of the anchor head can be prevented from being damaged.

Drawings

FIG. 1 is a schematic view of the overall structure of a self-drilling prestressed hollow expanded bottom anchor with built-in blades according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a self drilling prestressed hollow expanded bottom anchor incorporating a knife blade according to example 1 of the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is a cross-sectional view of a self-drilling prestressed hollow expanded bottom anchor incorporating a knife blade according to example 3 of the present invention;

FIG. 5 is an enlarged schematic view of portion B of FIG. 4;

fig. 6 is a schematic structural view of the retreating part;

in the figure, 1, an anchor head; 2. an anchor body; 3. a guide hole; 4. a bottom expanding blade; 5. a mounting cavity; 6. a threaded hole; 7. grouting holes; 8. a stopping portion; 9. a screw; 10. deformation abdication groove.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution:

example 1:

1-3, the self-drilling prestress hollow bottom-expanding anchor rod with the built-in blade comprises an anchor head 1 and an anchor rod body 2 in transmission connection with the anchor head 1;

at least two guide holes 3 communicated with the inside of the anchor head 1 are uniformly formed in the anchor head 1, a bottom expanding blade 4 is slidably arranged in the guide holes 3, one end of the bottom expanding blade 4 is retracted into the anchor head 1, and the other end of the bottom expanding blade 4 does not exceed the orifice of the guide holes 3;

when the anchor head 1 is positioned at the bottom of the anchor hole, the anchor rod body 2 rotates and axially advances to push the bottom expanding blade 4 out of the guide hole 3, and when the bottom expanding blade 4 is in place, the anchor rod body 2 rotates to drive the anchor head 1 and the bottom expanding blade 4 to synchronously rotate to expand the bottom.

The anchor head 1 is internally provided with a communicated installation cavity 5 and a threaded hole 6 matched with the external threads of the anchor body 2 in sequence, and one end of the bottom expanding blade 4 is retracted into the installation cavity 5.

Wherein, 1, one end of the anchor rod body 2 far away from the anchor head 1 is connected with a drilling machine; 2. the anchor head 1 is a common anchor head 1 for a drill rod, which is in the prior art and will not be described herein.

Working principle: drilling an anchor hole: and drilling anchor holes through the drill rod and the drilling machine.

(2) Ejecting the bottom expanding blade 4: and inserting the assembled anchor rod into the anchor hole, connecting one end of the anchor rod body 2 with a drilling machine after inserting, and tightly propping the anchor head 1 at the bottom of the anchor hole after connecting. At the moment, the friction force between the anchor head 1 and the bottom of the anchor hole is increased and is larger than the screw pair resistance between the anchor head 1 and the anchor rod body 2. Starting the drilling machine, wherein the drilling machine drives the anchor rod body 2 to rotate, and when the anchor rod body 2 rotates, the anchor head 1 is tightly propped against the anchor rod, so that the anchor head 1 does not rotate along with the anchor rod; at this time, the anchor rod body 2 is screwed in along the axial direction thereof, and the bottom expanding blade 4 is ejected out during the screwing process of the anchor rod body 2.

(3) Bottom expanding of the hole bottom: when the bottom expanding blade 4 is ejected to the limit position, the bottom expanding blade 4 cannot be ejected continuously, and the flaring size is larger than the diameter of the anchor hole. The anchor body 2 cannot continue to advance under the limit of the bottom expanding blade 4, at this time, the drilling machine is slightly retracted, and the pressure on the anchor head 1 is removed. When the drilling machine continues to drive the anchor rod body 2 to rotate, the anchor rod body 2 drives the drill bit and the bottom expanding blade 4 to synchronously rotate. The bottom expanding blade 4 rotates (3-10 circles) to complete the bottom expanding.

The invention can be suitable for deep hole bottom expansion by only increasing the size of the anchor head 1, and the pushing-out and bottom expansion of the bottom expansion blade 4 can be realized by the same equipment, and the bottom expansion process is simple and quick.

Example 2:

as shown in fig. 1 and 2, in this embodiment, on the basis of embodiment 1, the anchor body 2 is a hollow anchor, and the anchor head 1 is provided with a grouting hole 7.

When the anchor rod body 2 is a hollow anchor rod, grouting is performed through the inside of the anchor rod body 2, and grout enters the anchor holes through the grouting holes 7 after entering, so that grouting anchoring of the anchor rod is realized. Wherein, grouting is performed after prestressing.

Example 3:

as shown in fig. 1 and fig. 3-6, in this embodiment, on the basis of embodiment 2, the anchor head 1 is a drill bit;

one end of the anchor rod body 2 extends into the mounting cavity 5, and a backstop part 8 is arranged at the end part of the anchor rod body 2;

the retaining portion 8 is used for preventing the end portion of the anchor rod body 2 from exiting the mounting cavity 5.

When the anchor rod body 2 is reversed, the drill bit is driven to synchronously rotate, so that the anchor hole is drilled; when the anchor hole is drilled, the anchor rod body 2 rotates positively, the bottom expanding blade 4 is ejected out, and the bottom expanding blade 4 is driven to rotate to expand the bottom.

The retaining portion 8 is of a frustum-shaped structure, and the diameter of the large-size end of the retaining portion 8 is larger than the aperture of the threaded hole 6.

Working principle: drilling anchor holes: one end of the anchor rod body 2 far away from the drill bit is connected with a drilling machine, the drilling machine drives the anchor rod body 2 to reversely rotate, and at the moment, the anchor rod body 2 cannot axially displace relative to the drill bit due to the action of the retaining part 8, and then the anchor rod body 2 drives the drill bit to synchronously reversely rotate. And when the anchor rod body 2 and the drill bit are rotated reversely, drilling is realized.

After the anchor hole is drilled, the operations of ejecting the bottom expanding blade 4 and the hole bottom expanding in the embodiment 1 are repeated, and the ejecting movement in the embodiment 1 is realized by rotating the anchor rod body 2 in the forward direction during the process of ejecting the bottom expanding blade 4. After the bottom expansion is completed, the grouting operation as described in example 2 may be performed.

According to the invention, the anchor head 1 is in threaded connection with the anchor rod body 2, and the stop part 8 is arranged at the end part of the anchor rod body 2 to realize drilling when the anchor rod body 2 rotates reversely, and the bottom expanding blade 4 and the bottom expanding blade are ejected when the anchor rod body rotates positively; the drilling driving of the anchor head 1, the bottom expanding blade 4 and the rotation driving of the bottom expanding are respectively realized through the screw thread pair; the anchor rod integrates anchor hole drilling, bottom expanding, prestressing and grouting.

Example 4:

as shown in fig. 3-6, the large-size end of the retaining part 8 is connected with a screw rod 9, and the screw rod 9 extends into the anchor rod body 2 to be in threaded connection with the anchor rod body 2;

the retaining part 8 is provided with a deformation abdication groove 10 along the axial direction of the anchor rod. Wherein the deformation relief groove 10 extends to half the length of the screw 9 (the deformation relief groove 10 divides the front end of the screw 9 into two halves and the retaining portion 8 into two halves), and the screw 9 is a hollow screw 9.

The retaining portion 8 is provided so as to facilitate assembly of the anchor head 1 with the anchor body 2. When assembling, the screw 9 is screwed into the anchor body 2. When the anchor body 2 and the anchor head 1 are assembled, the two half retaining parts 8 are pressed tightly, and the diameter of the large-size section of the retaining part 8 is smaller than the diameter of the threaded hole 6. At this time, the retaining portion 8 may extend into the threaded hole 6, and when the retaining portion 8 is screwed into the mounting cavity 5, it automatically rebounds to an initial (large-sized end diameter larger than the diameter of the threaded hole 6) state due to the loss of the limit of the threaded hole 6. The sound generated when the two half retaining parts 8 rebound can determine that the retaining parts 8 enter the mounting cavity 5, and then the anchor body 2 and the anchor head 1 are assembled in place.

By arranging the retaining part 8 and the anchor body 2 into a split structure, the installation of the anchor body 2 and the anchor head 1 is facilitated, and the integral structure of the anchor head 1 can be prevented from being damaged.

Further, as shown in fig. 3 or 5, the bottom expanding blade 4 has an arc-shaped structure. In this embodiment, the number of the bottom expanding blades 4 is 2 (the number of the bottom expanding blades 4 may also be a positive integer greater than 2). The bottom expanding blade 4 is arranged in such a way that one ends of the bottom expanding blades, which are positioned in the installation cavity 5, are mutually propped up, and limit the bottom expanding blade 4 by matching with the guide holes 3, so that the bottom expanding blade 4 is prevented from falling into the installation cavity 5 completely from the guide holes 3.

The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims (7)

1. The utility model provides a concealed blade self-drilling formula prestressing force cavity bottom expanding stock which characterized in that: comprises an anchor head and an anchor body in transmission connection with the anchor head;

at least two guide holes communicated with the inside of the anchor head are uniformly formed in the anchor head, a bottom expanding blade is slidably arranged in the guide holes, one end of the bottom expanding blade is retracted into the anchor head, and the other end of the bottom expanding blade does not exceed the orifice of the guide hole;

when the anchor head is positioned at the bottom of the anchor hole, the anchor body rotates and axially advances to eject the bottom expanding blade out of the guide hole, and when the bottom expanding blade is in place, the anchor body rotates to drive the anchor head and the bottom expanding blade to synchronously rotate to expand the bottom.

2. The self drilling prestressed hollow expanded bottom anchor of claim 1, wherein: the anchor head is internally provided with a communicated installation cavity and a threaded hole which is matched with the external threads of the anchor rod in sequence, and one end of the bottom expanding blade is retracted into the installation cavity.

3. The self drilling prestressed hollow expanded bottom anchor of claim 2, wherein: the anchor rod body is a hollow anchor rod, and the anchor head is provided with a grouting hole.

4. A self drilling prestressed hollow expanded bottom anchor with built-in blades according to claim 3, wherein: the anchor head is a drill bit;

one end of the anchor rod body extends into the mounting cavity, and a retaining part is arranged at the end part of the anchor rod body;

the stop is used for preventing the end of the anchor rod body from exiting the mounting cavity.

5. The self drilling prestressed hollow expanded bottom anchor of claim 4, wherein: the retaining part is of a frustum-shaped structure, and the diameter of the large-size end of the retaining part is larger than the aperture of the threaded hole.

6. The self drilling prestressed hollow expanded bottom anchor of claim 5, wherein: the large-size end of the retaining part is connected with a screw rod which extends into the anchor rod body to be in threaded connection with the anchor rod body;

the retaining portion is provided with a deformation abdicating groove along the axial direction of the anchor rod.

7. The self drilling prestressed hollow under-reamed bolt of any one of claims 1-6, wherein: the bottom expanding blade is of an arc-shaped structure.