CN112796808A - Combined full-length anchoring pre-stressed anchor rod, stirrer and construction method - Google Patents
Combined full-length anchoring pre-stressed anchor rod, stirrer and construction method Download PDFInfo
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- CN112796808A CN112796808A CN202011586054.2A CN202011586054A CN112796808A CN 112796808 A CN112796808 A CN 112796808A CN 202011586054 A CN202011586054 A CN 202011586054A CN 112796808 A CN112796808 A CN 112796808A
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- anchor rod
- grouting
- stirrer
- rod
- anchor
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- 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
- E21D20/021—Grouting with inorganic components, e.g. cement
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- 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
- E21D20/025—Grouting with organic components, e.g. resin
Abstract
The invention discloses a combined full-length anchoring prestressed anchor rod, a stirrer and a construction method, wherein the anchor rod comprises solid steel bars and a hollow grouting anchor rod, and the solid steel bars are connected with the head of the hollow grouting anchor rod through threads; the middle section of the hollow grouting anchor rod is flat, and a grout return hole is formed in the middle section and is a through hole; the tail of the hollow grouting anchor rod is provided with a tray, and the tray is fixed through a nut. The stirrer is matched with the anchor rod to stir the resin anchoring agent. The invention combines the mine resin anchoring agent end anchoring technology with the hydraulic tunnel hollow grouting full-length anchoring technology to realize the quick high-strength prestress supporting effect.
Description
Technical Field
The invention discloses a combined full-length anchoring prestressed anchor rod suitable for soft rock underground engineering surrounding rock support and a construction method corresponding to a stirrer matched with the anchor rod.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the anchor-spraying support of soft rock underground engineering, the anchor rod plays a role in lifting, so that the key point is to select the type of the anchor rod scientifically. The anchor rod is selected according to the characteristics of soft rock, and the anchor rod capable of actively supporting is selected as much as possible. Only the anchor rod which can actively change the stress state of the surrounding rock and improve the overall strength characteristic of the surrounding rock can be suitable for soft rock support; otherwise, the anchor rod should not be selected, if the steel bar cement mortar anchor rod, prestress can not be applied during installation, and the initial slippage of the anchor rod is larger. The deformation, cracking, bed separation and loosening of the surrounding rock cannot be effectively prevented, so that the method cannot be used in soft rock roadway support. Therefore, not only can the initial slippage of the anchor rod member be eliminated, but also certain prestress can be given to the surrounding rock, so that the tensile stress of the tensile section of the surrounding rock is reduced, the shearing section of the surrounding rock is greatly improved in shear strength due to the friction force generated by the prestress, and meanwhile, the premature crack is avoided, and the weakening process of the surrounding rock can be slowed down. Practice proves that the combined action of surrounding rock and support can be realized only by improving the pretightening force of the anchor rod.
The existing prestressed anchor rod application method mainly adopts methods such as a shell expansion anchor head and a resin explosive cartridge, and has the following problems: when the shell-expanding anchor head applies a prestress mode, the contact area is small, larger anchoring force cannot be applied, and in addition, in soft rock underground engineering, due to insufficient surrounding rock strength, the anchoring force is easy to reduce or even disappear due to surrounding rock deformation; resin cartridges have the problem of durability, generally cannot be used as a permanent support material in hydraulic engineering and traffic tunnels, in addition, the resin cartridges are generally all end anchors, the prestress provided is limited, and even though a full-length anchoring mode is used, the hole diameter of a general drill hole cannot be too large due to the problem of matching of the diameter and the hole diameter of the cartridges, so that high prestress cannot be implemented.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a combined full-length anchoring prestressed anchor rod, a stirrer and a construction method which are suitable for supporting soft rock underground engineering surrounding rocks.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a combined full-length anchoring prestressed anchor rod, including a solid steel bar and a hollow grouting anchor rod, where the solid steel bar is connected with a head of the hollow grouting anchor rod through a thread; the middle section of the hollow grouting anchor rod is flat, and a grout return hole is formed in the middle section; the tail of the hollow grouting anchor rod is provided with a tray, and the tray is fixed through a nut. The head of cavity slip casting stock be equipped with the internal thread, solid reinforcing bar on be equipped with the external screw thread, internal thread and external screw thread cooperation.
As a further technical scheme, the spiral direction of the internal thread is opposite to the rotation direction of the anchor rod.
As a further technical scheme, the pulp return hole is a pair of through holes.
As a further technical scheme, the section (flat part) where the pulp return hole is located is quenched and tempered, and the point is not a stressed weak part.
As a further technical scheme, the diameter of the pulp return hole is 0.3-0.6 cm.
As a further technical scheme, the grout stopping device also comprises a grout stopping plug, and the grout stopping plug is used for being matched with the grout returning hole.
In a second aspect, the invention provides a stirrer used in cooperation with the anchor rod, the stirrer comprises a stirrer body, a clamping ring is sleeved at one end of the stirrer body and used for connecting the stirrer with the tail part of the hollow grouting anchor rod, the other end of the stirrer body is connected with a connecting rod, and the connecting rod is used for being connected with a drilling machine.
In a third aspect, based on the above-mentioned combined full-length anchoring prestressed anchor and the stirrer, an embodiment of the present invention further provides a construction method, including the following steps:
1) drilling by a rock drill or a pneumatic drill;
2) cleaning the hole, namely cleaning the wall of the full-length hole by using an air pipe made of PVC and other materials, and avoiding redundant slag at the inner end of the hole to the greatest extent so as to ensure the anchoring effect of the resin anchoring agent;
3) installing a resin anchoring agent according to needs; after drilling and forming holes, pushing the resin anchoring agent to the bottom of the hole by the anchor rod;
4) connecting a clamping ring of a stirrer with the tail part of the combined full-length anchoring prestressed anchor rod, connecting a connecting rod of the stirrer with a drilling machine, starting the drilling machine, stirring a resin anchoring agent, standing, tightening a tray, a nut, a grout stop plug and other parts, and applying primary prestress;
5) and grouting, namely grouting a setting time controllable ultra-early strength micro-expansion type grouting material into the rod body from the exposed hollow section of the anchor rod, wherein the grouting hole is reserved, the grout can fill the space inside and outside the hollow rod body except the inner anchor section, and after the grout is stopped and filled, the grouting in the hole is indicated to be full, the grout is stopped in time, and the construction operation is completed.
6) And after the slurry is solidified for a set time, applying a second prestress.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
1. after the anchor rod is installed, the prestress can be applied when the anchoring agent reaches the standard solidification time (about 5 minutes), so that the timely application of the prestress is ensured;
2. the initial prestress of the anchor rod is more than or equal to 10 tons, the anchor rod is matched with the micro-expansion grouting material for use, the later prestress can not be weakened or even disappear, and the prestress can be slightly increased due to the reaction of the micro-expansion of the grouting material on the surrounding rock and the anchor head.
3. The invention combines the mine resin anchoring agent end anchoring technology with the hydraulic tunnel hollow grouting full-length anchoring technology to realize the quick high-strength prestress supporting effect.
4. According to the invention, through optimizing the raw materials, the finally prepared grouting material has the characteristics of controllable setting time, early strength, easiness in diffusion, micro-expansion and the like, the material is not contracted after being set by micro-expansion, and the phenomenon that the material is fallen off from surrounding rocks on the wall of a hole due to the contraction of the set material is avoided, so that the grouting material has a supporting effect in a soft rock support in time.
5. The technical scheme has the advantages that the configuration method and the field process are simple to implement, the initial setting time is controlled to be about 1h, the final setting time is relatively fast, the early-strength effect is good, the requirement on the operation procedure is met, the setting can be performed as soon as possible, and the method is particularly suitable for supporting the underground soft rock, so that the method has good practical application value.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 illustrates a modular full-length anchored pre-stressed anchor structure according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic illustration of a disclosed agitator configuration according to one or more embodiments of the present disclosure;
in the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.
1 solid steel bar, 2 solid steel bar and cavity slip casting stock linkage segments, 3 grout returning holes, 4 cavity slip casting stocks, 5 trays, 6 nuts, 7 grout stopping plugs, 8 snap rings, 9 agitator bodies, 10 connecting rods.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background of the invention, the disadvantages of the prior art are solved by the present invention, which provides a combined full-length anchored prestressed anchor, a stirrer and a construction method.
In a typical embodiment of the present invention, as shown in fig. 1, firstly, a combined full-length prestressed anchor rod suitable for supporting surrounding rock of soft rock underground engineering is provided, which mainly comprises an inner rod body and an outer rod body, wherein the inner rod body is a solid steel bar 1 and is used for combining with a resin cartridge to form an initial anchoring force; the outer rod body is a hollow grouting anchor rod 4, and the hollow rod body is a main body part and is used for subsequent grouting and supporting stress; the middle section of the hollow grouting anchor rod 4 is flat, a grout return hole 3 is formed in the middle section, an internal thread is formed in the head of the hollow grouting anchor rod, an external thread is formed in the solid steel bar, and the internal thread is matched with the external thread to realize connection between the inner section of rod body and the outer section of rod body.
The specific manufacturing method of the outer rod body comprises the following steps: a section of carbon steel Q345 is processed by the processes of blanking of a pipe blank → hot rolling hollow steel → hot rolling anchor rod → blanking upsetting and extruding → drilling → quenching → tempering and the like; or the outer rod body is formed by modifying a commercially available common high-strength hollow grouting anchor rod, and the modification point mainly has two aspects: firstly, two rod bodies are tightly connected with internal threads (namely internal threads) in the connecting section of the inner rod body; the direction of the internal thread is opposite to the rotation direction of the anchor rod. And secondly, a pair of through holes is arranged at the position close to the connecting section, and then the point is ensured not to be a stressed weak part through flattening, quenching and tempering. Among them, the diameter of the perforation is preferably 0.3cm to 0.6 cm. Preferably, the distance between the perforation and the connecting section is about 15 cm-20 cm, and the specific distance is set according to actual needs.
In the combined full-length prestressed anchor rod in the embodiment, the slurry outlet hole of the anchor rod is arranged in the middle of the anchor rod, the solid steel bar part at the head of the anchor rod is matched with the existing resin cartridge for use, the hollow grouting anchor rod part is used for grouting, the slurry return hole is arranged, slurry can fill the space inside and outside the hollow grouting anchor rod except the solid steel bar, and after the slurry return of the slurry plug is stopped, the fact that the grouting in the hole is full is indicated, and the slurry is stopped in time; the anchor rod can combine the grouting process and the resin cartridge for use, and the initial anchoring force is improved.
In addition, the combined full-length prestressed anchor rod further comprises a tray, a grout stop plug, a locking nut and the like, wherein the tray is sleeved at the tail part of the hollow grouting anchor rod and is locked through the locking nut; the grout stop plug 7 is also arranged at the tail part of the hollow grouting anchor rod to plug the grouting hole.
After the anchor rod disclosed by the invention is installed, the prestressed force can be applied when the anchoring agent reaches the standard solidification time (about 5 minutes), so that the timely application of the prestressed force is ensured; and the breaking elongation of the rod body is more than or equal to 15 percent; the ultimate tensile strength is more than or equal to 245 KN.
The initial prestress of the invention is more than or equal to 10 tons, and the invention is used in cooperation with the micro-expansion grouting material, so that the later prestress can not be weakened or even disappear, and the prestress can be slightly increased because the micro-expansion of the grouting material reacts on the surrounding rock and the anchor head.
Further, the embodiment also provides a stirrer matched with the combined full-length prestressed anchor rod for use, which comprises a stirrer body 9, wherein the stirrer body 9 is made of metal, and the rear end of the stirrer body 9 is provided with a connecting rod 10 connected with a drilling machine; the connecting rod 10 is an outer hexagonal connecting rod, the outer hexagonal connecting rod is matched with an inner hexagonal jack of the drilling machine, the front section of the stirrer body 9 is detachably connected with a clamping ring 8, and the clamping ring 8 and the connecting rod 10 are both made of metal materials; and preferably, the connecting rod 10 is welded with the agitator body 9 or integrally formed.
The anchor rod connecting stirrer is matched with an anchor rod drilling machine to be used for quickly stirring and installing the resin anchor rod in tunnel support, and sufficient prestress can be provided after the stirring and stirring of the resin anchor rod. However, resin anchor rods in the existing market are mainly used for supporting mine and underground coal mine tunnels, the resin anchor rods for supporting tunnel engineering, particularly hydraulic tunnels are almost blank, and the engagement force between the stirrer and the external threads of the anchor rod body is continuously increased in the stirring process of the resin anchor rods, so that the stirrer is difficult to disassemble after the resin cartridges are stirred.
The use method of the stirring device comprises the following steps:
1. the part with the dismantlement snap ring device of agitator front end and the body of rod swivelling joint of cavity stock, the agitator rear end sets up the outer hexagonal connecting rod of hexagonal jack adaptation and is connected with the rig.
2. The stirrer directly drives the rod body to stir the anchoring agent for about 20-30 s, and stirring is stopped.
3. After the stirring is finished, the front end knocks the snap ring sleeve, and the stirrer is rotated to be loosened, and is taken down for subsequent recycling.
The implementation provides a clamp ring dismounting device on the premise of the function of the anchor rod stirrer; in the process, the stirrer is guaranteed to have enough connection strength, and can transmit and provide high rotating force under the action of high-speed rotation of large torque, but the stirrer is convenient to detach after stirring is finished. Therefore this embodiment provides a snap ring centre gripping formula agitator, after the stirring, strikes the snap ring sleeve pipe and can become flexible the agitator easily, and agitator centre gripping part is made by the alloy steel processing that high strength, toughness are good moreover, can satisfy and dismantle the use repeatedly. The stirrer can directly drive the rod body to stir the anchoring agent, and has light weight, convenient carrying and strong adaptability.
Further, the present embodiment provides a construction method based on the anchor rod and the stirring device, and the construction method includes:
drilling by a rock drill or a pneumatic drill;
cleaning the hole, cleaning the wall of the full-length hole by using an air pipe made of PVC and the like, and avoiding redundant slag at the inner end of the hole to the greatest extent so as to ensure the anchoring effect of the resin anchoring agent;
and thirdly, installing 1-2 resin anchoring agents (rapid type, stirring time 20-30 s) with the diameter of 35cm and the diameter of 40mm according to needs. After drilling and pore forming, the anchor rod pushes the resin anchoring agent to the bottom of the hole, the anchor rod stirrer is matched with the hollow anchor rod connecting stirrer disclosed by the invention, the resin anchoring agent is stirred for 20-30 s and then stands for 5 minutes, and then components such as a tray, a nut, a grout stop plug and the like can be tightened to apply first prestress.
Grouting, namely grouting a setting time controllable ultra-early strength micro-expansion type grouting material into the rod body from the exposed hollow section of the anchor rod, wherein the grouting hole is reserved, so that the space inside and outside the hollow rod body except the inner anchor section is filled with the grouting liquid, and after the grouting plug is stopped to return the grouting liquid, the grouting in the hole is indicated to be full, and the grouting is stopped in time, so that the construction operation is completed.
Furthermore, the setting-time-controllable super-early-strength micro-expansion grouting material comprises a gel main body material, a filling and compacting component, a coagulation regulating component, a water-retention thickening component, a water-reducing component and an early-expansion component. The cementing main material is a mixture of ordinary portland cement clinker powder and sulphoaluminate cement clinker powder, and the mass ratio of the ordinary portland cement clinker powder to the sulphoaluminate cement clinker powder is 18-21: 39 to 42. The filling dense component comprises one or more of fly ash, mineral powder and limestone powder; preferably, the mass ratio of the fly ash to the mineral powder to the limestone powder is 10-20: 0-10: 0 to 10; preferably, the fly ash is second-grade fly ash or first-grade fly ash, and further preferably is first-grade fly ash; preferably, the ore powder is S95-grade ore powder or S105-grade ore powder, and further preferably S105-grade ore powder; preferably, the limestone powder is ground limestone powder, and more preferably, the fineness of the limestone powder is controlled to be not more than 12% of the sieve residue of a 45-micron square-hole sieve.
The coagulation regulating component comprises a set retarding component and a set accelerating component.
The retarding component comprises one or more of anhydrite powder, sodium gluconate and tartaric acid powder; preferably, the mass ratio of the anhydrite powder to the sodium gluconate to the tartaric acid powder is 1-4.8: 0-0.5: 0-0.5; the coagulation promoting component comprises any one or more of anhydrous sodium sulphate, calcium formate and lithium carbonate; preferably, the mass ratio of the anhydrous sodium sulphate to the calcium formate to the lithium carbonate is 1:0-0.1: 0-0.1.
The water-retaining thickening component comprises one or more of hydroxypropyl cellulose ether, redispersible latex powder and polyacrylamide; preferably, the mass ratio of the hydroxypropyl cellulose ether to the redispersible latex powder to the polyacrylamide is 0.1-0.5:0-0.5: 0-0.5; the water reducing component comprises a polycarboxylic acid water reducing agent; the early expansion component includes a plastic expansion agent.
The mass ratio of the gelled main body material to the filling compact component to the coagulating component to the accelerating component to the water-retaining thickening component to the water-reducing component to the early-stage swelling component is as follows:
55-65:25-35:45-50:0.8-1.5:0.9-1.2:1.5-2.0:0.6-1.0。
the preparation method comprises the following steps: mixing the raw materials with water, and stirring to obtain slurry; the mass ratio of the raw materials to the water is 1: 0.3-0.5, preferably 1: 0.4.
According to the technical scheme, the raw materials are optimized, the finally prepared grouting material has the characteristics of controllable setting time, early strength, easiness in diffusion, micro-expansion and the like, the material is not contracted after being set through micro-expansion, the phenomenon that the material is separated from surrounding rocks on the wall of a hole due to the contraction of the set material is avoided, and therefore the grouting material plays a role in supporting soft rocks in time.
The invention combines the mine resin anchoring agent end anchoring technology with the hydraulic tunnel hollow grouting full-length anchoring technology to realize the quick high-strength prestress supporting effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The combined full-length anchoring prestressed anchor rod is characterized by comprising solid steel bars and a hollow grouting anchor rod, wherein the solid steel bars are connected with the head of the hollow grouting anchor rod through threads; the middle section of the hollow grouting anchor rod is flat, a grout return hole is formed in the middle section, and the grout return hole is a through hole; the tail of the hollow grouting anchor rod is provided with a tray, and the tray is fixed through a nut.
2. The combined full-length anchored prestressed anchor bolt of claim 1, wherein said hollow grouting anchor has an internal thread at its head, and said solid reinforcing bar has an external thread, said internal thread and said external thread being engaged; the spiral direction of the internal thread is opposite to the rotation direction of the anchor rod.
3. The combined full length anchorage prestressed anchorage bolt of claim 1, wherein said grout return hole is a pair of through holes.
4. The combined full length anchorage prestressed anchorage bar of claim 1, wherein the section of the slurry return hole is subjected to quenching and thermal refining.
5. The combined full-length anchored prestressed anchor as claimed in claim 1, wherein said grout-returning hole has a diameter of 0.3-0.6 cm.
6. The combined full length anchored prestressed anchor as claimed in claim 1, further comprising a grout stop plug, said grout stop plug being inserted into the tail portion of said hollow grouting anchor.
7. A stirrer used in combination with the combined full-length anchoring prestressed anchor rod as claimed in any one of claims 1 to 6, wherein the stirrer comprises a stirrer body, one end of the stirrer body is sleeved with a snap ring, the snap ring is used for connecting the stirrer with the tail part of the hollow grouting anchor rod, the other end of the stirrer body is connected with a connecting rod, and the connecting rod is used for being connected with a drilling machine.
8. The anchor rod construction method suitable for the surrounding rock support of the soft rock underground engineering is characterized by comprising the following steps of:
1) drilling by a rock drill or a pneumatic drill;
2) cleaning holes;
3) driving a resin anchoring agent into the bottom of the hole by the bolt of any one of claims 1-6;
4) connecting the snap ring of the stirrer of claim 7 with the tail part of the combined full-length anchoring prestressed anchor rod, connecting the connecting rod of the stirrer with a drilling machine, starting the drilling machine, stirring the resin anchoring agent, standing, tightening the tray, the nut and the grout stopping plug, and applying a first prestress;
5) grouting, namely grouting a setting-time-controllable ultra-early-strength micro-expansion type grouting material into the rod body from the exposed hollow section of the anchor rod, wherein the grouting hole is reserved, so that the space inside and outside the hollow rod body except the inner anchor section is filled with the grouting liquid, and after the grouting is stopped and the grouting is filled in the hole, the grouting is stopped in time, and the construction operation is completed;
6) and after the slurry is solidified for a set time, applying a second prestress.
9. The method for constructing a rock bolt suitable for the surrounding rock support of soft rock underground engineering, as claimed in claim 8, wherein the setting time controllable ultra-early strength type micro-expansion grouting material comprises a gel main body material, a filling and compacting component, a set adjusting component, a water retention and thickening component, a water reducing component and an early expansion component.
10. The anchor rod construction method suitable for soft rock underground engineering surrounding rock support, according to claim 9, wherein the cementing host material is a mixture of ordinary portland cement clinker powder and sulphoaluminate cement clinker powder, and the mass ratio of the ordinary portland cement clinker powder to the sulphoaluminate cement clinker powder is 18-21: 39-42;
the filling dense component comprises one or more of fly ash, mineral powder and limestone powder;
the coagulation regulating component comprises a set retarding component and a set accelerating component; the water-retaining thickening component comprises one or more of hydroxypropyl cellulose ether, redispersible latex powder and polyacrylamide;
the water-retaining thickening component comprises one or more of hydroxypropyl cellulose ether, redispersible latex powder and polyacrylamide;
the water reducing component comprises a polycarboxylic acid water reducing agent;
the early expansion component includes a plastic expansion agent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011586054.2A CN112796808A (en) | 2020-12-28 | 2020-12-28 | Combined full-length anchoring pre-stressed anchor rod, stirrer and construction method |
| AU2021103533A AU2021103533A4 (en) | 2020-12-28 | 2021-06-22 | Combined full-length anchoring pre-stressed anchor rod, agitator and construction method |
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| CN202011586054.2A CN112796808A (en) | 2020-12-28 | 2020-12-28 | Combined full-length anchoring pre-stressed anchor rod, stirrer and construction method |
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| CN112796808A true CN112796808A (en) | 2021-05-14 |
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| CN202011586054.2A Pending CN112796808A (en) | 2020-12-28 | 2020-12-28 | Combined full-length anchoring pre-stressed anchor rod, stirrer and construction method |
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| AU (1) | AU2021103533A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934792A (en) * | 2022-04-13 | 2022-08-23 | 中国矿业大学(北京) | Stirrer suitable for prestressed anchor rod |
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| AU2021103533A4 (en) | 2021-09-09 |
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Effective date of registration: 20211025 Address after: 430223 No.2, Xiaohongshan, guoguohu, Wuchang District, Wuhan City, Hubei Province Applicant after: INSTITUTE OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES Applicant after: China National Railway Group Co.,Ltd. Address before: 430223 No.2, Xiaohongshan, guoguohu, Wuchang District, Wuhan City, Hubei Province Applicant before: INSTITUTE OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES |