CN115573750A - Pressure relief anchor pipe - Google Patents

Pressure relief anchor pipe Download PDF

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Publication number
CN115573750A
CN115573750A CN202211101136.2A CN202211101136A CN115573750A CN 115573750 A CN115573750 A CN 115573750A CN 202211101136 A CN202211101136 A CN 202211101136A CN 115573750 A CN115573750 A CN 115573750A
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CN
China
Prior art keywords
pipe body
hole
resistance increasing
sleeve
pressure relief
Prior art date
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Pending
Application number
CN202211101136.2A
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Chinese (zh)
Inventor
袁越
张峰彬
刘兆强
王卫军
朱永建
张立亚
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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Publication date
Application filed by Hunan University of Science and Technology filed Critical Hunan University of Science and Technology
Priority to CN202211101136.2A priority Critical patent/CN115573750A/en
Publication of CN115573750A publication Critical patent/CN115573750A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23—Dune restoration or creation; Cliff stabilisation

Abstract

The invention provides a pressure relief anchor pipe, which relates to the technical field of anchor pipes and comprises a pipe body, an end elastic part and a resistance increasing part, wherein one end of the pipe body is used for extending into a hole, the other end of the pipe body is positioned outside the hole, the hole is formed in surrounding rocks, the end elastic part is arranged on the pipe body outside the hole, one end of the end elastic part is used for transmitting elasticity to the surrounding rocks, the other end of the end elastic part can transmit the elasticity to the pipe body, the resistance increasing part is arranged between the pipe body in the hole and the inner wall of the hole, the resistance increasing part is in contact with the outer wall of the pipe body and the inner wall of the hole, and the resistance increasing part can move relative to the pipe body and generate friction when being subjected to stress applied by deformation of the surrounding rocks. The scheme provided by the invention can improve the pressure-relief and energy-absorbing capacity and enhance the stability of surrounding rocks, and has a simple structure.

Description

Pressure relief anchor pipe
Technical Field
The invention relates to the technical field of anchor pipes, in particular to a pressure relief anchor pipe.
Background
The anchor pipe support is widely applied to tunnel construction, foundation pit construction and slope stability reinforcement. The anchor pipe is a pipe body prepared from steel pipes, and is inserted into a pre-drilled hole during construction, and an anchoring section formed by grouting of the anchor pipe is used for combining unstable rock masses or surrounding rocks with stable rock masses, so that the aim of supporting is fulfilled. The anchor pipe can actively reinforce the rock-soil body, can make the rock-soil body give full play to its self stability, effectively control the deformation of the rock-soil body, furthest protects the integrity of the surrounding rock, and prevents the damage of the whole collapse of the rock-soil body.
The underground space engineering with high risk (hereinafter referred to as "dangerous underground space engineering") refers to an underground space engineering which is easy to cause personnel crowd injury or serious economic loss in the construction process, such as high-stress large-section tunnel engineering, deep or ultra-deep foundation pit engineering, deep broken surrounding rock engineering and the like. In the construction activity, the dangerous underground space engineering has the characteristics of large quantity, wide distribution, difficult control, large harm and the like, and once an accident occurs, serious consequences or adverse social influence are easily caused. Such as high stress deep surrounding rock engineering, is in the environment of large burial depth, high ground stress, complex geological structure and the like, and is accompanied with characteristics of fissure water, poor rock mass strength and the like. The rock mass is under the action of high ground stress, generates the crushing and swelling creep behavior, has very complex influencing factors and presents high nonlinearity. For the primary support of a high-stress deep surrounding rock tunnel, a tunnel foot locking anchor pipe is often used for supporting, the foot locking anchor pipe is a key part for controlling the deformation of a lining structure in the construction period of weak surrounding rock, and a temporary inverted arch is generally arranged at the lower end of an arch frame.
Compared with an anchor rod, the anchor pipe is strong in bearing capacity, high in anchoring force and good in shearing resistance and bending resistance. For an underground engineering structure under a weak and broken geological condition, anchor rod support needs to be anchored to a stable stratum to a certain depth to play a role, and the support effect is not good in broken surrounding rock; after the grouting of the anchoring section of the anchor pipe, the inside and the outside of the anchor pipe are wrapped by the grout, the anchoring effect is superior to that of an anchor rod, the anchor pipe does not need to be anchored to a stable stratum for a certain depth, the anchoring section formed by self grouting can play a role in supporting, and the anchor pipe is suitable for supporting the key parts of dangerous underground space engineering under the complex geological condition. Therefore, in the underground space engineering such as foundation pit engineering, tunnel engineering and the like, the region with poor geological condition is often provided with the anchor pipe to resist deformation and achieve the purpose of supporting. However, the common anchor pipe is generally subjected to pressure grouting through a pipe body to form a full-length cohesive anchor pipe, and has no pressure relief capacity and limited ultimate stretching length; the common pressure relief anchor pipe has a complex structure and insufficient yielding stroke. When the surrounding rock is deformed greatly, the common anchor pipe cannot meet the requirement of engineering safety to adapt to the large deformation of the surrounding rock, so that the adverse conditions of failure, breakage and the like of the anchor head of the anchor pipe are caused, the supporting effect of the anchor pipe is lost, and even engineering accidents are caused.
Disclosure of Invention
The invention aims to provide a pressure relief anchor pipe, which aims to solve the problems in the prior art, improve the pressure relief and energy absorption capacity, enhance the stability of surrounding rocks and have a simple structure.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a pressure relief anchor pipe which comprises a pipe body, an end elastic piece and a resistance increasing piece, wherein one end of the pipe body is used for extending into a hole, the other end of the pipe body is positioned outside the hole, the hole is formed in surrounding rock, the end elastic piece is arranged on the pipe body outside the hole, one end of the end elastic piece is used for transmitting elastic force to the surrounding rock, the other end of the end elastic piece can transmit the elastic force to the pipe body, the resistance increasing piece is arranged between the pipe body in the hole and the inner wall of the hole, the resistance increasing piece is in contact with the outer wall of the pipe body and the inner wall of the hole, and the resistance increasing piece can move relative to the pipe body and generate friction when being subjected to stress applied by deformation of the surrounding rock.
Preferably, the tip elastic component includes two annular backing plates, elastomer and nut, two annular backing plates all overlap and locate outside the hole on the body, two possess the interval between the annular backing plate, the elastomer is pressed from both sides and is located two between the annular backing plate, one the annular backing plate is close to the drill way and sets up and support in on the country rock of drill way department, another the annular backing plate deviates from elastomer one side threaded connection has on the body the nut, it is rotatory the nut can make the elastomer is in compression state.
Preferably, a plurality of elastic bodies are arranged, each elastic body is a spring, and the elastic bodies are uniformly arranged between the two annular base plates in the circumferential direction of the pipe body.
Preferably, the slurry injection device further comprises a sleeve, the sleeve is sleeved with the pipe body and extends into one end in the hole, one end of the sleeve faces the end of the hole, a conical head is fixedly arranged at one end of the hole, the large end of the conical head is fixedly connected with the sleeve, the small end of the conical head faces the end of the hole, a plurality of slurry injection holes are formed in the conical head, a small slurry stop plug is arranged in an annular gap between the sleeve and the pipe body, a large slurry stop plug is arranged on the sleeve, the large slurry stop plug is located towards one side of the hole bottom, the small slurry stop plug is located towards one side of the hole bottom, the resistance increase piece is fixedly arranged on the sleeve, and the sleeve can move relative to the pipe body under the action of external force.
Preferably, the resistance increasing piece comprises a plurality of resistance increasing units, the resistance increasing units are uniformly distributed along the length direction and the circumferential direction of the pipe body, and the resistance increasing units are fixedly arranged on the sleeve.
Preferably, the resistance increasing unit is of a steel groove structure with two wings, the resistance increasing unit is U-shaped or V-shaped, the resistance increasing unit penetrates through the sleeve and is fixed on the sleeve, and wing tips on two sides of the resistance increasing unit are respectively contacted with the pipe body and the inner wall of the hole.
Preferably, the end opening of the pipe body is provided with a check valve.
Preferably, the small grout stop plug is arranged on one side, facing the bottom of the hole, of the outer wall of the pipe body and the outer side of the check valve are respectively covered with an isolating layer, and the bonding force between the isolating layer and the grout is smaller than that between the outer wall of the pipe body and the check valve and the grout.
Preferably, a sealing structure is arranged between one end of the sleeve facing the orifice and the pipe body.
Preferably, the resistance increasing unit has elastic deformation capability, and when the resistance increasing unit is assembled, the resistance increasing unit applies prestress to the pipe body.
Compared with the prior art, the invention has the following technical effects:
(1) The pressure relief anchor pipe provided by the invention has a two-stage pressure relief process, wherein the first stage is pressure relief of the end elastic part, and the second stage is pressure relief of the resistance increasing part, so that the pressure relief and energy absorption capacity is strong.
(2) The pressure relief anchor pipe provided by the invention has strong practicability and a simple structure, and can be effectively ensured to be stable when being installed at the key part of dangerous underground space engineering under a complex geological condition.
(3) The pressure relief anchor pipe provided by the invention has the advantages of strong bearing capacity, high anchoring force and good shearing and bending resistance, can effectively reduce the occurrence of anchoring failure of the anchor pipe, and can be used for grouting reinforcement of surrounding rock, so that the overall stability of the surrounding rock is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the overall construction of a pressure relief anchor tube provided by the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view C-C of FIG. 1;
FIG. 5 is a schematic view of the connection of the check valve of FIG. 1;
FIG. 6 is a force analysis diagram of a single resistance increasing unit;
FIG. 7 is a diagram illustrating the force applied between the resistance increasing member and the tube;
fig. 8 is a schematic pressure relief view of the pressure relief anchor tube of fig. 1.
In the figure: 1. surrounding rocks; 2. a pipe body; 3. a nut; 4. an elastomer; 5. an annular backing plate; 6. a sleeve; 7. a resistance increasing unit; 8. a large grout stop plug; 9. a small grout stop plug; 10. an isolation layer; 11. a check valve; 11a, a valve body; 11b, a valve flap; 11c, a rocker; 12. grouting holes; 13. an external thread; 14. a conical head; 15. an annular seal plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
The invention aims to provide a pressure relief anchor pipe, which aims to solve the problems in the prior art, improve the pressure relief and energy absorption capacity, has a simple structure and enhances the stability of surrounding rocks.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
The invention provides a pressure relief anchor pipe which is suitable for controlling critical parts of dangerous underground space engineering, and as shown in figures 1-5, the pressure relief anchor pipe comprises a pipe body 2, an end part elastic part and a resistance increasing part, wherein one end of the pipe body 2 is used for extending into a hole, the other end of the pipe body is positioned outside the hole, the hole is formed in surrounding rock 1 and is a drilled hole, slurry flows into the drilled hole through a hollow cavity in the pipe body 2 through a grouting hole 12 during grouting, the end part elastic part is arranged on the pipe body 2 outside the hole, one end of the end part elastic part is used for transmitting elasticity to the surrounding rock 1, the other end of the end part elastic part can transmit the elasticity to the pipe body 2, the resistance increasing part is arranged between the pipe body 2 in the hole and the inner wall of the hole, the resistance increasing part is in contact with the outer wall of the pipe body 2 and the inner wall of the hole, and the resistance increasing part can generate relative movement and generate friction with the pipe body 2 when the resistance increasing part is subjected to stress exerted by deformation of the surrounding rock 1.
The pressure relief anchor pipe provided by the invention can realize the yielding (also called pressure relief) process of two stages, the yielding of the first stage is realized through the compression or tensile deformation of the end part elastic part, and the yielding of the first stage can release the stress of surrounding rocks to a certain degree; in the second stage, yielding is performed in such a way that the resistance increasing piece is relatively displaced relative to the pipe body 2, friction is generated between the resistance increasing piece and the pipe body, the yielding process is realized in the mode of generating friction force, the yielding in the stage can greatly release the stress of the large-deformation surrounding rock, and the pressure relief anchor pipe provided by the invention improves the pressure relief capability.
In another embodiment, the end elastic member includes two annular base plates 5, an elastic body 4 and a nut 3, the two annular base plates 5 are all sleeved on the pipe body 2 outside the hole, a gap is provided between the two annular base plates 5, the elastic body 4 is clamped between the two annular base plates 5, one annular base plate 5 is arranged close to the hole and abuts against the surrounding rock 1 at the hole, the nut 3 is connected to the pipe body 2 on one side of the other annular base plate 5 away from the elastic body 4 in a threaded manner, the elastic body 4 can be in a stressed state by rotating the nut 3, the two annular base plates 5 can move along the length direction of the pipe body 2, a thread is arranged at one end of the pipe body 2 outside the hole, so that the nut 3 can be screwed, the nut 3 is rotated to enable the whole device to be in a pre-tightening state, and when the surrounding rock 1 deforms, the purpose of pressure relief is achieved by compressing the elastic body 4.
In another embodiment, a plurality of elastic bodies 4 are provided, the elastic bodies 4 are springs, preferably high-strength springs, and the number of the elastic bodies 4 is preferably 4-6, and the plurality of elastic bodies 4 are uniformly arranged between the two annular backing plates 5 around the circumference of the pipe body 2.
In another embodiment, the outer diameter of the pipe body 2 is 40mm to 80mm, the thickness is 4mm to 8mm, and the pipe body 2 is made of steel.
In another embodiment, the pressure relief anchor pipe further comprises a sleeve 6, the sleeve 6 is sleeved on one end of the pipe body 2 extending into the hole, a conical head 14 is fixedly arranged at one end of the sleeve 6 facing the bottom of the hole, the large end of the conical head 14 is fixedly connected with the sleeve 6, the small end of the conical head faces the bottom of the hole, a plurality of grouting holes 12 are formed in the conical head 14, a small grout stop plug 9 is arranged in an annular gap between the sleeve 6 and the pipe body 2, a large grout stop plug 8 is sleeved outside the sleeve 6, the large grout stop plug 8 is located on one side of the resistance increasing member facing the bottom of the hole, the small grout stop plug 9 is located on one side of the large grout stop plug 8 facing the bottom of the hole, the resistance increasing member is fixedly arranged on the sleeve 6, and the sleeve 6 can move relative to the pipe body 2 under the action of external force. The small grout stop plug 9 and the large grout stop plug 8 are used for preventing grout from flowing back to the space where the resistance increasing piece is located from the bottom of the hole, if the resistance increasing piece is soaked in the grout and the grout is solidified, the resistance increasing piece is fixed with the hole wall and the pipe body 2, relative displacement cannot be generated when the surrounding rock 1 deforms, and the pressure relief effect of the second stage can be influenced.
Wherein the sleeve 6 provides a mounting condition for increasing the resistance piece, and the back is starched and solidifies, and sleeve 6 and peripheral country rock 1 are fixed as an organic whole structure, and the messenger on drive sleeve 6 and its increases the resistance piece and moves or drive body 2 and move for sleeve 6 and the increase resistance piece on it when country rock 1 takes place to warp, and then realizes the release of second section.
In another embodiment, the outer diameter of the sleeve 6 is 90mm-140mm, the thickness is 4mm-8mm, and the sleeve 6 is made of steel.
In another embodiment, the resistance increasing member includes a plurality of resistance increasing units 7, the plurality of resistance increasing units 7 are uniformly arranged along the length direction and the circumferential direction of the pipe body 2, and the resistance increasing units 7 are all fixedly arranged on the sleeve 6.
In another embodiment, the resistance increasing unit 7 is a steel groove structure with two wings, the resistance increasing unit 7 is U-shaped or V-shaped, the resistance increasing unit 7 penetrates through the sleeve 6 and is fixed on the sleeve 6, and the wing tips at two sides of the resistance increasing unit 7 are respectively contacted with the pipe body 2 and the inner wall of the hole.
In another embodiment, the end opening of the pipe body 2 is provided with a check valve 11 to prevent the slurry from flowing back, and the check valve 11 is a swing check valve 11 suitable for horizontal and vertical pipelines. The working principle of the device is that the device acts through the pressure effect generated by medium flow or the pressure effect of the valve flap, wherein the pressure impact valve flap mainly rotates when slurry flows; when grouting is completed, due to the gravity action of the valve clack, a spring component is arranged at the joint of the rocker, and the channel is closed when no liquid pressure exists.
In another embodiment, the outer wall of the pipe body 2 and the check valve 11 at the side of the small grout stop plug 9 facing the bottom of the hole are covered with an isolation layer 10, the adhesion between the isolation layer 10 and the grout is smaller than the adhesion between the outer wall of the pipe body 2 and the grout of the check valve 11, the isolation layer 10 is made of a grease coating or a wrapping film, the isolation layer 10 and the check valve 11 are bonded together by glue, the isolation layer 10 and the solidified grout, the pipe body 2 and the check valve 11 are not strong in adhesion, and the pipe body 2 can be separated from the grout when the pipe body 2 is stressed greatly, so that a second pressure relief process is realized.
In another embodiment, the small grout stopping plug 9 and the large grout stopping plug 8 are made of high-strength synthetic rubber and are both truncated cone-shaped structures with central holes, the diameter of the central hole of the small grout stopping plug 9 is just enough to be sleeved on the outer wall of the pipe body 2, and the diameter of the central hole of the large grout stopping plug 8 is just enough to be sleeved on the outer wall of the sleeve 6.
In another embodiment, a sealing structure is provided between the end of the sleeve 6 facing the opening and the tube body 2, and the sealing structure is an annular sealing plate 15.
In another embodiment, the resistance increasing unit 7 has an elastic deformation capability, when the resistance increasing unit 7 is assembled, the resistance increasing unit 7 applies a pre-stress to the pipe body 2, the pre-stress is determined according to the designed yielding capability, and the larger the required yielding capability is, the larger the corresponding pre-stress is.
FIG. 6 is a force analysis diagram of a single resistance increasing unit 7, wherein f 1 For the friction force of the single resistance-increasing unit 7 against the pipe body 2, f 1 Friction of the individual body 2 against the resistance-increasing elements 7 f 1 And f 1 ' is a pair of interaction forces. The resistance increasing unit 7 has elastic deformation capacity, when the resistance increasing unit 7 is installed, assembly stress sigma is applied to the pipe body 2, the resistance increasing unit 7 generates certain elastic deformation, and the size of sigma is determined according to the designed yielding capacity. FIG. 7 is a stress analysis diagram of the integral resistance increasing unit 7 and the pipe body 2, the stress of the surrounding rock 1 acts on a single anchor pipe with a force P, and the maximum friction force which can be provided by the integral resistance increasing unit 7 is f max . When P is greater than f max The resistance increasing units 7 are oppositeThe pipe body 2 is relatively displaced, and the second stage of yielding starts.
The positive pressure F provided by the pipe body 2 to the single resistance increasing unit 7 1 The expression of (a) is:
F 1 ＝-N 1 ＝σ 1 ·S 1
maximum friction provided by the integral resistance-increasing unit 7
Figure BDA0003839476160000071
Wherein, N 1 Normal pressure applied to the pipe body 2 by a single resistance-increasing unit 7 is prefabricated and installed;
F 1 positive pressure is provided for the pipe body 2 to the single resistance increasing unit 7;
S 1 the contact area of the single resistance increasing unit 7 and the pipe body 2 is set;
mu is the dynamic friction coefficient between the contact surfaces of the resistance increasing unit 7 and the pipe body 2;
f max the maximum friction force that can be provided by all the resistance increasing units 7.
As shown in fig. 8, the pressure relief principle of the pressure relief anchor pipe of the invention is as follows: the AB section is a pre-tightening force applying stage of the anchor pipe, the pre-tightening force is applied to the anchor pipe by screwing the nut 3, the pipe body 2 generates initial pre-stress and generates tiny elastic deformation, after the anchor pipe is grouted and anchored, the surrounding rock 1 is just deformed, and the anchor pipe provides weak rigidity support for the surrounding rock 1; when the stress of the anchor pipe is increased, the anchor pipe enters a BC section, namely a yielding process of a first stage, the elastic body 4 (a high-strength spring is adopted in the embodiment) is subjected to compression deformation, and the deformation energy of the surrounding rock 1 is preliminarily released; if the stress of the surrounding rock 1 continues to increase, entering a CD section, namely a rapid resistance increasing stage of the anchor pipe; under the influence of construction or mining disturbance, the pressure of the surrounding rock 1 is increased, the surrounding rock 1 continues to deform, and when the pressure of the surrounding rock 1 reaches the maximum yielding resistance of the anchor pipe, namely f max When the anchor pipe enters the DE section, namely the yielding process of the second stage of the anchor pipe, the supporting force provided by the anchor pipe to the surrounding rock 1 is yielding constant resistance, the resistance increasing unit 7 displaces relative to the pipe body 2, the deformation energy of the surrounding rock 1 is greatly released, and then the surrounding rock is enabled to be greatly releasedThe rock 1 remains relatively stable; if the deformation of the surrounding rock 1 continues to increase, when the end part of the front end of the pipe body 2 slides to the resistance increasing unit 7, the stress of the anchor pipe enters an EF section, namely a controlled yielding stage of the anchor pipe, the stress of the surrounding rock 1 at the moment can be further released, but the supporting resistance provided for the surrounding rock 1 can be reduced step by step; and finally, with the further increase of the tensile force of the anchor pipe, entering an FG section, namely a failure and damage stage of the anchor pipe, wherein the deformation of the surrounding rock 1 exceeds the yielding limit capacity of the yielding anchor pipe, and the sleeve 6 and the pipe body 2 are subjected to slipping failure and damage.
The construction method comprises the following steps:
(1) Before the anchor pipe is constructed, whether the hollow cavity, the sleeve 6, the grouting hole 12 and other parts of the pipe body 2 are smooth or not should be carefully checked, and if foreign matters are blocked, the pipe body should be cleaned in time. Selecting hole sites and drilling angles according to design requirements, marking, and preparing grouting materials according to the drilling hole spacing or the field supervision requirement;
(2) The drilling machine is in place, and when the drilling machine drives the drill rod to drill to a preset depth, the drilling machine and the drill rod are removed; after hole forming, placing the prefabricated anchor pipe into a drill hole;
(3) The tail end of the anchor pipe is communicated with high-pressure air, sundries in the cavity of the anchor pipe, the sleeve 6 and the grouting hole 12 are blown clean, then whether grouting equipment is complete and normal is checked, after all the equipment is normal, the tail end of the anchor pipe is connected with a grouting pump through a quick grouting connector, then a mortar stirrer is started, grouting materials are made manually according to a matching proportion, and then the grouting materials are input into the stirrer to be stirred by adding water. After the mixture is uniformly stirred, inputting the mixture into a grouting pump, keeping a grouting high-pressure pipe straight during grouting, and continuously infusing the mixture in the whole grouting process without stopping flow, wherein the grouting is finished at one time;
(4) The amount of the mortar is determined according to the pressure of the mortar pump or according to the mortar consumption rate of the mortar mixer. The grouting pressure is controlled according to a design value, the initial grouting pressure is generally between 0.5 and 1.5MPa, and the grouting is stopped when the grouting is full and the pressure reaches the design value;
(5) And (4) removing the grouting equipment, and timely cleaning and arranging the grouting pipeline and the grouting equipment. There must not be a knock, bump or any additional load applied before the slurry has finally set.
(6) After the slurry in the drill hole is condensed and reaches a certain strength, the annular base plate 5, the high-strength spring and the nut 3 are sequentially installed on the tail end of the pipe body 2 at the hole opening of the drill hole, and the nut 3 is fastened to the designed pre-tightening force of the anchor pipe.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A release anchor pipe which characterized in that: including body, tip elastic component and resistance-increasing piece, the one end of body is arranged in stretching into the hole, and the other end is located extraforaminiferous, the hole forms in the country rock, the tip elastic component set up in extraforaminiferous on the body, just the one end of tip elastic component is used for transmitting elasticity to the country rock, and the other end can transmit elasticity extremely on the body, resistance-increasing piece set up in downthehole the body with between the inner wall in hole, resistance-increasing piece with the body outer wall and the inner wall in hole contacts, resistance-increasing piece when receiving the stress that the country rock warp and exert can with relative motion takes place for the body and produces the friction.
2. The pressure relief anchor tube of claim 1, wherein: the tip elastic component includes two annular backing plates, elastomer and nut, two the annular backing plate all overlaps and locates outside the hole on the body, two possess the interval between the annular backing plate, the elastomer is pressed from both sides and is located two between the annular backing plate, one the annular backing plate is close to the drill way and sets up and support in on the country rock of drill way department, another the annular backing plate deviates from elastomer one side threaded connection has on the body the nut is rotatory the nut can make the elastomer is in compression state.
3. The pressure relief anchor tube of claim 2, wherein: the elastic bodies are springs and are uniformly arranged between the two annular base plates in the circumferential direction of the pipe body.
4. The pressure relief anchor tube of claim 1, wherein: the slurry filling device is characterized by further comprising a sleeve, the sleeve is sleeved with a pipe body extending into one end of the hole, a conical head is fixedly arranged at one end of the sleeve facing the hole bottom, the large end of the conical head is fixedly connected with the sleeve, the small end of the conical head faces the hole bottom, a plurality of slurry filling holes are formed in the conical head, a small slurry stopping plug is arranged in an annular gap between the sleeve and the pipe body, a large slurry stopping plug is arranged on the sleeve, the large slurry stopping plug is located towards a resistance increasing piece facing one side of the hole bottom, the small slurry stopping plug is located towards the resistance increasing piece facing one side of the hole bottom, the resistance increasing piece is fixedly arranged on the sleeve, and the sleeve can move relative to the pipe body under the action of external force.
5. The pressure relief anchor tube of claim 4, wherein: the resistance increasing piece comprises a plurality of resistance increasing units, the resistance increasing units are uniformly distributed along the length direction and the circumferential direction of the pipe body, and the resistance increasing units are fixedly arranged on the sleeve.
6. The pressure relief anchor tube of claim 5, wherein: the resistance increasing unit is of a steel groove structure with two wings, the resistance increasing unit is U-shaped or V-shaped, the resistance increasing unit penetrates through the sleeve and is fixed on the sleeve, and wing tips on two sides of the resistance increasing unit are respectively contacted with the pipe body and the inner wall of the hole.
7. The pressure relief anchor tube of claim 4, wherein: and a check valve is arranged at the opening at the tail end of the pipe body.
8. The pressure relief anchor tube of claim 7, wherein: the small grout stop plug faces to one side of the bottom of the hole, the outer wall of the pipe body and the check valve are covered with isolating layers, and the bonding force between the isolating layers and the grout is smaller than that between the outer wall of the pipe body and the check valve and the bonding force of the grout.
9. The pressure relief anchor tube of claim 4, wherein: and a sealing structure is arranged between one end of the sleeve facing the hole and the pipe body.
10. The pressure relief anchor tube of claim 6, wherein: the resistance increasing unit has elastic deformation capacity, and when the resistance increasing unit is assembled, the resistance increasing unit applies prestress to the pipe body.
CN202211101136.2A 2022-09-09 2022-09-09 Pressure relief anchor pipe Pending CN115573750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211101136.2A CN115573750A (en) 2022-09-09 2022-09-09 Pressure relief anchor pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211101136.2A CN115573750A (en) 2022-09-09 2022-09-09 Pressure relief anchor pipe

Publications (1)

Publication Number Publication Date
CN115573750A true CN115573750A (en) 2023-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211101136.2A Pending CN115573750A (en) 2022-09-09 2022-09-09 Pressure relief anchor pipe

Country Status (1)

Country Link
CN (1) CN115573750A (en)

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