CN110565648A - anchor head expandable anchor rod and construction method thereof - Google Patents

anchor head expandable anchor rod and construction method thereof Download PDF

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Publication number
CN110565648A
CN110565648A CN201910732325.1A CN201910732325A CN110565648A CN 110565648 A CN110565648 A CN 110565648A CN 201910732325 A CN201910732325 A CN 201910732325A CN 110565648 A CN110565648 A CN 110565648A
Authority
CN
China
Prior art keywords
rod
anchor
skeleton
head
expandable
Prior art date
Application number
CN201910732325.1A
Other languages
Chinese (zh)
Inventor
梅岭
丁夏
Original Assignee
江苏科技大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 江苏科技大学 filed Critical 江苏科技大学
Priority to CN201910732325.1A priority Critical patent/CN110565648A/en
Publication of CN110565648A publication Critical patent/CN110565648A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads

Abstract

The invention discloses an anchor head expandable anchor rod and a construction method thereof. The construction method comprises the following steps: a. drilling an anchor hole by using an anchor rod spiral drilling machine; b. prefabricating an anchor rod; c. inserting an anchor rod; d. grouting liquid is filled in the anchor holes, and the anchor rods are installed; e. installing the tray at the tail of the rod body to extrude the tray to a side slope of the rock-soil body into which the anchor rod is inserted; f. and (5) mounting a bolt at one end of the rod body exposed at the tail end of the tray, screwing and finishing construction. The invention has convenient operation, firmness and reliability; the pulling resistance of the device can be continuously enhanced in the pulling process; the anchor rod can be effectively prevented from being separated from the slope soil body, and the maintenance of the slope stability is facilitated.

Description

anchor head expandable anchor rod and construction method thereof
Technical Field
the invention relates to geotechnical engineering equipment and a construction method thereof, in particular to an anchor head expandable anchor rod and a construction method thereof.
Background
The anchor rod is a main supporting form of foundation pits of roadway engineering, underground engineering, mining engineering and the like, and is also a main supporting form in the process of side slope excavation. In order to avoid collapse or instability caused by deformation of the formation, bolt reinforcement is often used. In the anchor bolt supporting process, the self-stability of the original soil body and the rock body is fully utilized to obtain the reinforcing effect, and the high-strength tensile capacity of the anchor bolt enables the stability of the rock body to be firmer.
the invention discloses an authorized bulletin number of 'CN 105822331A', relating to a resistance-increasing yielding anchor rod. But the problems are that: (1) the rod body can not ensure that the acting force between the rod body and the rock-soil body is enough to elongate the rod body; (2) the uneven atress in bolt both sides can lead to the body of rod slope, is unfavorable for the stock structure to play a role.
in the current engineering application, the application of the anchor rod does not achieve an ideal effect, no good solution is provided for the displacement caused by the sliding problem of the side slope of the rock-soil mass, and the current anchor rod cannot be adjusted in time according to the change of the slope body. The anchor rod that adopts at present has certain defect: (1) the soil body is deformed to cause the loosening of the anchor rod, so that the anchoring effect of the anchor rod is reduced; (2) insufficient resistance to slippage; (3) the resistance to plucking is poor.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an anchor head expandable anchor rod which is convenient to operate, firm and reliable, and the invention also aims to provide a construction method of the anchor head expandable anchor rod with strong pulling resistance.
the technical scheme is as follows: the invention relates to an anchor head expandable anchor rod, which comprises an anchor head and a rod body, wherein the anchor head is connected with the rod body through a bearing, the rod body can rotate along with the bearing, a bolt, a bowl-shaped tray and a sleeve capable of sliding along the axial direction of the rod body are sequentially arranged on the rod body from right to left, the sleeve is connected with a supporting rod, the supporting rod is connected with an expandable framework, the expandable framework is connected with the bearing, and a spring is arranged on the rod body between the sleeve and the bearing.
The expandable framework is respectively hinged with the bearing and the supporting rod. The sleeve is hinged with the supporting rod. The side surface of the sleeve is provided with a connecting piece matched with the pin hole of the supporting rod.
the bearing comprises an outer ring, rolling balls, an inner ring and clamping grooves, the clamping grooves are formed in the outer ring to ensure that the expandable framework can move, and the rolling balls are arranged between the outer ring and the inner ring. The surface of the rolling ball is coated with an antirust agent and a lubricant, so that the rolling ball can rotate in any direction, and the surface of the sleeve corresponding to the rod body is coated with the lubricant. Can expand the skeleton and include skeleton dop, the skeleton body of rod and skeleton head, the both ends of the skeleton body of rod are skeleton dop, skeleton head respectively, in the draw-in groove was gone into to skeleton dop card, skeleton head was sharp toper, when can expand the skeleton, can sharp soil body of pricking, the interlock effect of reinforcing and soil body. The number of the expandable frameworks and the number of the clamping grooves are three, and the clamping grooves are uniformly distributed on the bearing at intervals, namely three corners of a regular triangle taking the bearing as an excircle.
Set up pin, chute, pinhole on the bracing piece, the bracing piece passes through the pin and can expand the skeleton articulated, and around pin normal direction rotation, the footpath of chute is can expand 1.2 ~ 1.4 times of skeleton diameter, can expand the skeleton during anchor rod construction and can hide in the chute, can reduce the complexity of anchor head structure, conveniently drills into the soil body.
The spring is made by high strength metal material, and spring strength is greater than body of rod intensity, plays the cushioning effect when the sleeve moves, avoids the sleeve to cause the sudden damage of bracing piece and deployable skeleton along body of rod dynamics inequality, velocity variation etc. when sliding. The sleeve is smooth and coated with lubricant, and the diameter of the sleeve is slightly larger than that of the rod body, so that the sleeve is convenient to slide.
The construction method of the anchor head expandable anchor rod comprises the following steps:
a. Drilling an anchor hole by using an anchor rod spiral drilling machine, wherein the diameter of the anchor hole is larger than that of the anchor head in a closed state;
b. Prefabrication of the anchor rod is completed, a plastic pipe is sleeved from the sleeve to the anchor head section, soil is prevented from falling into the sleeve to cause corrosion of the rod body, and the thread part at the tail part of the rod body is exposed;
c. After the anchor rod is qualified, the anchor rod is sent into the anchor hole, and external force is applied to ensure that the expandable anchor rod of the anchor head is not expanded completely through the extrusion of the sleeve;
d. Grouting liquid is filled in the anchor holes, and the anchor rods are installed;
e. installing the tray at the tail of the rod body to extrude the tray to a side slope of the rock-soil body into which the anchor rod is inserted;
f. and (5) mounting a bolt at one end of the rod body exposed at the tail end of the tray, screwing and finishing construction.
The working principle is as follows: after the anchor rod is inserted into the soil body, the anchor rod is screwed down and tensioned to prestress. During initial construction, the expandable framework of the anchor head of the anchor rod is expanded until the tip end of the framework head touches the wall of the anchor hole; the initial anchoring force after grouting is enhanced. After the ground body produces the displacement in later stage, the stock can receive the pulling force to buckle, and under strong pulling force effect, the sleeve can slide to the anchor head direction along the body of rod, is shortening along with the distance of sleeve apart from the bearing, can expand skeleton and bracing piece continuation slowly expand, and the extension of anchor head has lasted the reinforcement effect that has strengthened the stock. When the deformation of the rock-soil body slope is continuous or the displacement deformation of the slope is overlarge, an external force is manually applied to screw the bolt, the rod body rotates along with the bolt, the rod body of the anchor rod rotates and moves towards the anchor tail direction due to the existence of the bearing, the rod body is gradually tensioned, the sleeve is clamped in the drill hole due to resistance, the anchor head is gradually close to the sleeve, the distance of the rod body in the soil body is shortened, the expandable framework and the supporting rod continue to expand, the expansion degree of the anchor head continues to increase, and the anti-sliding capacity of the anchor rod is greatly enhanced; when the anchor head expandable device is completely expanded, the uplift resistance of the anchor rod is maximized.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the operation is convenient, firm and reliable, and the pulling resistance of the device can be continuously enhanced in the pulling process;
2. The anchor rod can be effectively prevented from being separated from the slope soil body, and the stability of the slope is favorably maintained;
3. The spring made of high-strength metal is arranged, so that a buffer effect is achieved when the sleeve runs, and sudden damage to the supporting rod and the expandable framework caused by uneven force, speed change and the like when the rod body slides is avoided;
4. The expandable framework can be hidden in the chute during construction, so that the complexity of the anchor head structure is reduced, and the anchor head is convenient to drill into soil;
5. the frame head is designed to be in a sharp cone shape, and when the expandable frame is unfolded, the expandable frame can be penetrated into a soil body sharply, so that the engagement effect with the soil body can be enhanced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the working state of the present invention;
FIG. 3 is a schematic view of the construction of the bearing 2 of the present invention;
FIG. 4 is a schematic view of the connection between the deployable frame 3 and the support rod 4 according to the present invention;
Fig. 5 is a schematic view of the construction of the sleeve 6 of the present invention.
Detailed Description
the directions shown in the drawings of the specification are up, down, left and right.
as shown in fig. 1-2, the anchor head expandable anchor rod comprises an anchor head 1, a bearing 2, an expandable framework 3, a support rod 4, a spring 5, a smooth sleeve 6, a tray 7, an octagonal bolt 8 and a rod body 9; the conical anchor head 1 is connected with an anchor rod body 9 through a rotatable bearing 2, and the rod body 9 can rotate along with the bearing 2; one end of the expandable framework 3 is hinged with the bearing 2, the middle position of the expandable framework 3 is hinged with the support rod 4, and three expandable frameworks 3 are arranged in total and are respectively distributed on three corners of a regular triangle taking the bearing (2) as an excircle circle; one end of the support rod 4 is hinged with the expandable framework 3, and the other end is hinged with the sleeve 6; the sleeve 6 is arranged on the rod body 9 and can slide along the axial direction of the rod body 9; the spring 5 made of high-strength metal material is sleeved on the rod body 9 and positioned between the sleeve 6 and the bearing 2, and plays a role in buffering when the sleeve 6 runs; the tray 7 is bowl-shaped and is positioned at the tail part of the rod body 9, and the internal thread of the tray 7 is matched with the external thread of the rod body 9; the inner thread of the octagonal bolt 8 is matched with the outer thread of the rod body 9.
As shown in fig. 3, the bearing 2 includes an outer ring 21, rolling balls 22, an inner ring 23, and a catching groove 24. The outer ring 21 of the bearing 2 is provided with three clamping grooves 24 corresponding to the ball clamping heads 31 of the expandable framework 3, so that the expandable framework 3 can move; the outer ring 21 and the inner ring 23 of the bearing 2 contain notches with the sizes corresponding to those of the rolling balls 22, and improved liquid such as antirust agent, lubricant and the like is added inside the notches, so that the rolling balls 22 can rotate in any direction.
Referring to fig. 4, the expandable frame 3 includes a frame clip 31, a frame rod 32 and a frame head 33. The framework head 33 is designed to be in a sharp cone shape, and can penetrate into the soil body sharply when the expandable framework 3 is expanded, so that the occlusion effect with the soil body is enhanced. The support rod 4 comprises a pin 41, a chute 42 and a pin hole 43. One end of the support rod 4 is hinged with the framework rod body 32 of the expandable framework 3 through a pin 41 and can rotate around a pin 43 in the normal direction; the diameter of chute 42 is 1.2 ~ 1.4 times of can expanding skeleton 3 diameter, and the skeleton 3 that can expand during anchor rod construction can be hidden in chute 42.
the construction steps of the anchor head expandable anchor rod of the invention are as follows:
(1) drilling an anchor hole by an anchor rod spiral drilling machine, wherein the diameter of the anchor hole is larger than that of the anchor rod in a closed state;
(2) manufacturing an anchor rod: after the anchor rod is prefabricated, a plastic pipe is sleeved in a section from a sleeve 6 to an anchor head 1 of the anchor rod, so that a rod body is prevented from being corroded due to soil falling, and a thread part at the tail part of the anchor rod is exposed;
(3) inserting an anchor rod: after the anchor rod is qualified, the anchor rod is sent into the hole, and external force is applied to ensure that the self-expanding device of the anchor head of the anchor rod is not expanded completely through the extrusion of the sleeve 6;
(4) grouting liquid is filled in the anchor holes, and the anchor rods are installed;
(5) the tray 7 is arranged at the tail part of the rod body 9 and is extruded on the side slope of the rock-soil body into which the anchor rod is inserted;
(6) And an octagonal bolt 8 is installed at one end of the rod body 9 exposed at the tail end of the tray 7 and screwed down, and construction is finished.

Claims (10)

1. The utility model provides an anchor head can expand formula stock which characterized in that: including anchor head (1) and the body of rod (9), anchor head (1) links to each other with the body of rod (9) through bearing (2), the body of rod (9) can rotate along with bearing (2), from right side to left side on the body of rod (9) sets gradually bolt (8), tray (7) and can follow body of rod (9) endwise slip sleeve (6), sleeve (6) link to each other with bracing piece (4), bracing piece (4) link to each other with can exhibition skeleton (3), can expand skeleton (3) and link to each other with bearing (2), set up spring (5) on the body of rod (9) between sleeve (6) and bearing (2).
2. An anchor head expandable anchor rod according to claim 1, wherein: the expandable framework (3) is hinged with the bearing (2) and the support rod (4) respectively.
3. an anchor head expandable anchor rod according to claim 1, wherein: the sleeve (6) is hinged with the support rod (4).
4. An anchor head expandable anchor rod according to claim 1, wherein: the bearing (2) comprises an outer ring (21), rolling balls (22), an inner ring (23) and clamping grooves (24), the clamping grooves (24) are formed in the outer ring (21), and the rolling balls (22) are arranged between the outer ring (21) and the inner ring (23).
5. An anchor head expandable anchor rod according to claim 4, wherein: the surface of the rolling ball (22) is coated with an antirust agent and a lubricant, and the surface of the sleeve (6) corresponding to the rod body (9) is coated with the lubricant.
6. An anchor head expandable anchor rod according to claim 4, wherein: can open up skeleton (3) include skeleton dop (31), skeleton body of rod (32) and skeleton head (33), the both ends of the skeleton body of rod (32) are skeleton dop (31), skeleton head (33) respectively, draw-in groove (24) are gone into to skeleton dop (31) card, skeleton head (33) are sharp toper.
7. An anchor head expandable anchor rod according to claim 4, wherein: the number of the expandable framework (3) and the number of the clamping grooves (24) are three, and the clamping grooves (24) are evenly distributed on the bearing (2) at intervals.
8. An anchor head expandable anchor rod according to claim 1, wherein: set up pin (41), chute (42), pinhole (43) on bracing piece (4), bracing piece (4) are articulated through pin (41) and deployable skeleton (3), and rotate around pin (41) normal direction, the diameter of chute (42) is 1.2 ~ 1.4 times of deployable skeleton (3) diameter.
9. An anchor head expandable anchor rod according to claim 1, wherein: and the side surface of the sleeve (6) is provided with a connecting piece (61) matched with the pin hole (41) of the support rod (4).
10. a construction method of an anchor head expandable anchor rod is characterized by comprising the following steps:
a. Drilling an anchor hole, wherein the diameter of the anchor hole is larger than that of the anchor head (1) in a closed state;
b. Prefabricating the anchor rod, sleeving a plastic pipe in the section from the sleeve (6) to the anchor head (1), and exposing the thread part at the tail part of the rod body (9);
c. After the anchor rod is qualified, the anchor rod is sent into the anchor hole, and external force is applied to ensure that the expandable anchor rod of the anchor head is not expanded completely through the extrusion of the sleeve (6);
d. Grouting liquid is filled in the anchor holes, and the anchor rods are installed;
e. the tray (7) is arranged at the tail part of the rod body (9) and is extruded on a side slope of the rock-soil body into which the anchor rod is inserted;
f. and a bolt (8) is installed at one end of the rod body (9) exposed at the tail end of the tray (7), and the construction is finished after the bolt is screwed down.
CN201910732325.1A 2019-08-08 2019-08-08 anchor head expandable anchor rod and construction method thereof CN110565648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910732325.1A CN110565648A (en) 2019-08-08 2019-08-08 anchor head expandable anchor rod and construction method thereof

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Application Number Priority Date Filing Date Title
CN201910732325.1A CN110565648A (en) 2019-08-08 2019-08-08 anchor head expandable anchor rod and construction method thereof

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CN110565648A true CN110565648A (en) 2019-12-13

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202369990U (en) * 2011-12-30 2012-08-08 湖北中南勘察基础工程有限公司 Large-diameter soil anchor rod construction device
KR101184564B1 (en) * 2011-08-16 2012-09-20 산하토건(주) Removed ground anchor using anchor body of umbrella type
CN104179178A (en) * 2014-08-28 2014-12-03 南昌工程学院 Flexible umbrella supporting anchor bolt and method for supporting soil slope thereby
CN106567384A (en) * 2016-11-14 2017-04-19 合肥工业大学 Fishbone-shaped anchor rod
CN106948343A (en) * 2017-04-20 2017-07-14 大连理工大学 The tonnage anchor cable and peace method processed of a kind of tension and compression combination bearing mode
CN207004554U (en) * 2017-08-02 2018-02-13 中铁十四局集团第二工程有限公司 A kind of multistage allows pressure grouting anchor pole
CN209191011U (en) * 2018-08-14 2019-08-02 詹梦琳 A kind of roof drilling device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101184564B1 (en) * 2011-08-16 2012-09-20 산하토건(주) Removed ground anchor using anchor body of umbrella type
CN202369990U (en) * 2011-12-30 2012-08-08 湖北中南勘察基础工程有限公司 Large-diameter soil anchor rod construction device
CN104179178A (en) * 2014-08-28 2014-12-03 南昌工程学院 Flexible umbrella supporting anchor bolt and method for supporting soil slope thereby
CN106567384A (en) * 2016-11-14 2017-04-19 合肥工业大学 Fishbone-shaped anchor rod
CN106948343A (en) * 2017-04-20 2017-07-14 大连理工大学 The tonnage anchor cable and peace method processed of a kind of tension and compression combination bearing mode
CN207004554U (en) * 2017-08-02 2018-02-13 中铁十四局集团第二工程有限公司 A kind of multistage allows pressure grouting anchor pole
CN209191011U (en) * 2018-08-14 2019-08-02 詹梦琳 A kind of roof drilling device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
朱敏等: "《工程材料》", 28 February 2018, 冶金工业出版社 *

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