CN114561941A - Prestressed anchor rod anchoring structure for free section post grouting - Google Patents
Prestressed anchor rod anchoring structure for free section post grouting Download PDFInfo
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- CN114561941A CN114561941A CN202210245159.4A CN202210245159A CN114561941A CN 114561941 A CN114561941 A CN 114561941A CN 202210245159 A CN202210245159 A CN 202210245159A CN 114561941 A CN114561941 A CN 114561941A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 86
- 239000004568 cement Substances 0.000 claims abstract description 65
- 238000005553 drilling Methods 0.000 claims abstract description 50
- 238000002955 isolation Methods 0.000 claims abstract description 30
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 230000000149 penetrating effect Effects 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims 3
- 238000000926 separation method Methods 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 238000005192 partition Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000002390 adhesive tape Substances 0.000 description 6
- 239000011440 grout Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of prestressed anchor rod bodies, and discloses a prestressed anchor rod anchoring structure for post-grouting of a free section, which comprises an anchor rod drilling hole, an anchor seat and a prestressed anchor rod body, wherein a partition plate is arranged between the free section and an anchoring section; the pre-stressed anchor rod body is provided with a primary grouting pipe and a rear grouting pipe, the bottom of the primary grouting pipe extends to the bottom of the anchoring section, and the top of the primary grouting pipe is positioned below the anchor seat; the rear grouting pipe is positioned above the isolation plate; grouting cement slurry to the outside of the anchoring section for the first time through the primary grouting pipe, and anchoring the anchoring section and the stratum; through back slip casting pipe toward the outside of free section and the hole injection mud that wears to establish for the second time, form the free cement section with free section and stratum anchor, free cement section is wrapping up and is wearing to establish section and free section, both plays anticorrosive protection effect, and free cement section and stratum bonding, make the free section produce the adhesion stress, if wear to establish the section and corroded the destruction, the free section can not destroy yet, has improved the corrosion resisting property of the prestressed anchorage pole body of rod by a wide margin.
Description
Technical Field
The invention relates to the technical field of a pre-stressed anchor rod body, in particular to a pre-stressed anchor rod anchoring structure for free section post grouting.
Background
Along the direction from inside to outside, the prestressed anchor rod body of rod includes anchor section, free segment, wears to establish the section and epitaxial section, and wherein, anchor section and stratum anchor, the free segment is in free stretch-draw state, wears to establish the section and wears to establish at the anchor block, is connected with the ground tackle on the epitaxial section, and the ground tackle is with epitaxial section and anchor block fixed arrangement.
In the prior art, the free section is wrapped by the plastic sleeve, anticorrosion lubricating oil is filled between the sleeve and the free section, the lubricating oil can prevent corrosion of the free section, and the frictional resistance of the free section is reduced when the prestressed anchor rod body is tensioned.
After the prestressed anchor rod body is installed, cement slurry is filled in the anchor rod drilling hole, the through hole of the anchor seat is empty, after the anchor device is installed, the prestressed anchor rod body is locked by utilizing jack tensioning, during tensioning, the prestressed anchor rod body can deform and extend under the action of tensile force, during locking, the anchor device clamping piece bites the locking extension section, and as the surface of the extension section cannot be provided with anticorrosive lubricating oil, the extension section and the sleeve in a certain length range of the through section are required to be stripped, the anticorrosive lubricating oil is washed clean, and thus the through section is exposed in the through hole.
For a long-term prestressed anchor rod body, the exposed penetrating section is an anticorrosive weak link and is easy to corrode and destroy, so that the prestressed anchor rod body fails.
Disclosure of Invention
The invention aims to provide a prestressed anchor rod anchoring structure for post-grouting of a free section, and aims to solve the problem that a penetrating section of a rod body of a prestressed anchor rod is in an exposed state in the prior art.
The invention is realized in this way, the prestressed anchor rod anchoring structure of post grouting to the free section, including anchor rod bore hole, anchor seat and prestressed anchor rod body inserted in the anchor rod bore hole, insert in the direction of the anchor rod bore hole along the prestressed anchor rod body, the said prestressed anchor rod body includes the extension section, wears to establish the section, free section and anchor section sequentially; a fixedly arranged isolation plate is arranged between the free section and the anchoring section; a through hole is formed in the anchor seat and is coaxially communicated with the anchor rod drilling hole, an anchorage device is connected to the extension section, and the extension section and the anchor seat are fixed by the anchorage device; the anchoring section extends to the bottom of the anchor rod drilling hole, the free section is arranged in the anchor rod drilling hole, the penetrating section is arranged in the penetrating hole in a penetrating mode, and the extending section is exposed out of the anchor seat;
the prestressed anchor rod body is provided with a primary grouting pipe, the bottom of the primary grouting pipe extends to the bottom of the anchoring section, and the top of the primary grouting pipe is positioned below the anchor seat; the prestressed anchor rod body is provided with a rear grouting pipe, the bottom of the rear grouting pipe extends to the free section and is positioned above the isolation plate, and the top of the rear grouting pipe penetrates through the anchor block and is exposed above the anchor block;
grouting cement into the outside of the anchoring section for the first time through the primary grouting pipe to form an anchoring cement section for anchoring the anchoring section and the stratum, wherein the anchoring cement section wraps the anchoring section; and grouting cement slurry to the outside of the free section and the through hole for the second time through the rear grouting pipe to form a free cement section for anchoring the free section and the stratum, wherein the free cement section wraps the through section and the free section.
Furthermore, the bottom of the rear grouting pipe is arranged in a closed mode, and grouting holes are formed in the periphery of the lower portion of the rear grouting pipe.
Furthermore, the periphery of the lower part of the rear grouting pipe is provided with a plurality of grouting holes which are arranged at intervals along the circumferential direction of the rear grouting pipe.
Further, an isolation gap is formed between the periphery of the isolation plate and the inner side wall of the anchor rod drilling hole, and the isolation plate is provided with a bottom end face facing the anchoring section; along the direction from bottom to top, the bottom end surface of the isolation plate is upwards sunken to form a bottom groove; be equipped with the lower gasbag of platykurtic and pressurized outwards expansion deformation in the bottom groove, the periphery at the anchor section is surrounded to gasbag down, the top and the bottom groove fixed connection of gasbag down, the periphery of gasbag is supporting the inside wall of stock drilling down.
Furthermore, a lower annular space is arranged between the inner side of the lower air bag and the anchoring section, and the anchoring cement section is embedded in the lower annular space and is pressed against the lower air bag from inside to outside.
Further, the periphery of lower gasbag is provided with down the butt adhesive tape, lower butt adhesive tape is supporting the inside wall of stock drilling.
Further, the separator has a tip end surface facing the free section; along the direction from top to bottom, the top end surface of the isolation plate is downwards concave to form a top groove; the anchor rod drilling device is characterized in that an upper air bag which is flat and is pressed to expand and deform outwards is arranged in the top groove, the upper air bag is surrounded on the periphery of the free section, the bottom of the upper air bag is fixedly connected with the top groove, and the periphery of the upper air bag is abutted to the inner side wall of the anchor rod drilling hole.
Further, go up the inboard of gasbag and be connected with the laminating of free section, it has the top face of arranging up to go up the gasbag, be equipped with a plurality of stereoplasm rings on the top face of going up the gasbag, the stereoplasm ring encircles along the circumference of free section and arranges, be equipped with the upper ring groove of undercut on the stereoplasm ring, it extends along the circumference of stereoplasm ring to go up the ring groove and arranges, the free cement section imbeds in last ring groove, and top-down is supported and is being pressed last gasbag.
Further, the periphery of going up the gasbag is provided with the butt adhesive tape, go up the butt adhesive tape and support the inside wall of pressing the stock drilling.
Furthermore, the bottom of the upper abutting joint rubber strip extends downwards to form a rubber ring, and the rubber ring is embedded into the isolation gap to block the isolation gap.
Compared with the prior art, the prestressed anchor rod anchoring structure for post-grouting of the free section provided by the invention has the advantages that the anchoring section is anchored by solidifying cement slurry poured for the first time outside the anchoring section, at the moment, the prestressed anchor rod body can be tensioned, then, cement slurry is poured for the second time outside the free section and the penetrating section, the free cement section wraps the free section and the penetrating section, the anticorrosion protection effect is achieved, the free cement section is bonded with the stratum, the free section generates the bonding force, if the penetrating section is corroded and damaged, the free section cannot be damaged, and the anticorrosion performance of the prestressed anchor rod body is greatly improved.
Drawings
FIG. 1 is a schematic front view of a prestressed anchor anchoring structure for post-grouting of a free section according to the present invention;
fig. 2 is an enlarged schematic view at a in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of implementations of the invention refers to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-2, a preferred embodiment of the present invention is shown.
The pre-stressed anchor rod anchoring structure for post-grouting of the free section comprises an anchor rod drilling hole 102, an anchor seat 100 and a pre-stressed anchor rod body inserted into the anchor rod drilling hole, wherein the pre-stressed anchor rod body sequentially comprises an extension section 201, a penetrating section 202, a free section 203 and an anchoring section 204 along the direction that the pre-stressed anchor rod body is inserted into the anchor rod drilling hole; a fixedly arranged insulation plate 600 is provided between the free section 203 and the anchoring section 204.
A through hole 103 is formed in the anchor seat 100, the through hole 103 is coaxially communicated with an anchor rod drilling hole, an anchorage device 101 is connected to the extension section 201, and after the rod body of the prestressed anchor rod is tensioned, the extension section is fixed with the anchor seat by the anchorage device 101; the anchoring section 204 extends to the bottom of the anchor drilling hole, the free section 203 is arranged in the anchor drilling hole, the penetrating section 202 is arranged in the penetrating hole 103 in a penetrating mode, and the extending section 201 is exposed out of the anchor base 100.
The prestressed anchor rod body is provided with a primary grouting pipe 301, the bottom of the primary grouting pipe 301 extends to the bottom of the anchoring section 204, and the top of the primary grouting pipe 301 is positioned below the anchor seat 100.
The prestressed anchor rod body is provided with a rear grouting pipe 300, the bottom of the rear grouting pipe 300 extends to the free section 203 and is located above the isolation plate 600, and the top of the rear grouting pipe 300 penetrates through the anchor block 100 and is exposed above the anchor block 100.
And grouting water for the first time to the outside of the anchoring section 204 through the primary grouting pipe 301 to form an anchoring cement section for anchoring the anchoring section 204 and the stratum, wherein the anchoring cement section wraps the anchoring section 204. After the first grouting is completed, the first grouting pipe 301 is abandoned, the anchor seat 100 and the anchorage 101 are constructed, then the prestressed anchor rod body is tensioned, at the moment, the anchoring section 204 is anchored, and the free section 203 and the penetrating section 202 are tensioned and stretched.
And cement paste is poured outside the free section 203 and the through hole 103 for the second time through the rear grouting pipe 300 to form a free cement section for anchoring the free section 203 and the stratum, wherein the free cement section wraps the through section 202 and the free section 203.
The prestressed anchor rod anchoring structure of the above-mentioned grouting behind the free segment that provides, grout solidifies in the outside of anchor section 204 through the grout of pouring for the first time, with anchor section 204 anchor, at this moment, then can carry out the stretch-draw operation with the prestressed anchor rod body of rod, then, the grout is poured in the outside of free segment 203 and the section 202 of wearing to establish again for the second time, free cement section is wrapping up free segment 203 and the section 202 of wearing to establish, both played the anticorrosive protection effect, and free cement section and stratum bonding, make free segment 203 produce the adhesion stress, if wear to establish section 202 and be corroded destruction, free segment 203 also can not destroy, the corrosion protection performance of the prestressed anchor rod body of rod has been improved by a wide margin.
In actual construction, construction may be performed according to the following construction steps.
1) Manufacturing a pre-stressed anchor rod body, wherein the pre-stressed anchor rod body sequentially comprises an extension section 201, a penetrating section 202, a free section 203 and an anchoring section 204 along the direction of inserting the pre-stressed anchor rod body into the anchor rod drilling hole 102; a fixedly arranged isolation plate 600 is arranged between the free section 203 and the anchoring section 204; the pre-stressed anchor rod body is provided with a primary grouting pipe 301 and a rear grouting pipe 300, the bottom of the primary grouting pipe 301 extends to the bottom of the anchoring section 204, and the top of the primary grouting pipe is positioned at an anchor rod drilling hole opening; the bottom of the rear grouting pipe 300 extends to the free section 203 and is located above the isolation plate 600, and the top of the rear grouting pipe 300 extends to the extension section 201;
2) the anchor seat 100 is constructed, a through hole 103 is formed in the anchor seat 100, the through hole 103 is coaxially communicated with an anchor rod drilling hole 102, and an anchorage device 101 is connected to an extension section 201; placing a prestressed anchor rod body in the anchor rod drilling hole 102, wherein the anchoring section 204 extends to the bottom of the anchor rod drilling hole 102, the free section 203 is placed in the anchor rod drilling hole 102, the penetrating section 202 is penetrated in the penetrating hole 103, the extending section 201 is exposed outside the anchor base 100, and the top of the rear grouting pipe 300 penetrates through the anchor base 100 and is exposed above the anchor base 100;
3) injecting cement slurry into the anchor rod drilling hole for the first time through the primary grouting pipe 301 until the anchor rod drilling hole 102 and the through hole 103 are filled with the cement slurry; clear water is injected into the anchor rod drilling hole 102 through the rear grouting pipe 300, the clear water dilutes the cement slurry outside the free section 203 and the cement slurry in the through hole 103 to set requirements, and the isolation plate 600 isolates the cement slurry flowing to the outside of the anchoring section 204;
when the cement slurry outside the free section 203 and the cement slurry in the through hole 103 are diluted to set requirements, the cement slurry cannot be solidified into a fixed state, and the subsequent tensioning of the prestressed anchor rod body cannot be limited;
4) after cement slurry outside the anchoring section 204 is solidified to a set requirement, an anchoring cement section for fixing the anchoring section 204 is formed, the anchoring cement section is anchored with the stratum, a prestressed anchor rod body is outwards tensioned by a jack, and after the free section 203 and the penetrating section 202 are tensioned and extended to the set requirement, the extending section 201 and the anchor seat 100 are fixed by an anchor 101;
5) and injecting cement slurry into the anchor rod drilling hole 102 for the second time through the rear grouting pipe 300 until the cement slurry is full of the outside of the free section 203 and the penetrating hole 103, forming a free cement section after the cement slurry is solidified, and wrapping the penetrating section 202 and the free section 203 by the free cement section and anchoring the free section with the stratum.
After cement slurry is injected into the anchor rod drilling hole 102 through the high pressure of the grouting pipe 301, clear water is injected into the anchor rod drilling hole 102 through the low pressure of the rear grouting pipe 300, the clear water is injected through the low pressure, the clear water is prevented from penetrating through the isolation plate 600, and dilution is conducted on the cement slurry outside the anchoring section 204.
The bottom of back slip casting pipe 300 seals arranges, and the periphery of the lower part of back slip casting pipe 300 is equipped with the slip casting hole, like this, avoids the clear water to spout from the bottom of back slip casting pipe 300, but from periphery blowout, reduces the clear water and passes the probability that the grout of division board 600 entering outside the anchor section 204.
In this embodiment, the rear grouting pipe 300 has a plurality of grouting holes formed in the outer periphery of the lower portion thereof, and the plurality of grouting holes are arranged at intervals along the circumferential direction of the rear grouting pipe 300.
In this embodiment, an isolation gap 601 is formed between the outer periphery of the isolation plate 600 and the inner side wall of the anchor rod drilling hole 102, so that the isolation plate 600 is conveniently placed in the anchor rod drilling hole 102; the insulation plate 600 has a bottom end face facing the anchor section 204; along the direction from bottom to top, the bottom end face of the partition plate 600 is upwardly recessed to form a bottom groove; a flat lower air bag 500 which expands and deforms outwards under pressure is arranged in the bottom groove, the lower air bag 500 surrounds the periphery of the anchoring section 204, and the top of the lower air bag 500 is fixedly connected with the bottom groove;
in the construction step 3), when cement slurry is injected into the anchor rod drilling hole 102 through the primary grouting pipe 301, after the anchoring section 204 is filled with the cement slurry, the cement slurry presses the lower air bag 500 from bottom to top to expand and deform outwards, and the periphery of the lower air bag 500 presses against the inner side wall of the anchor rod drilling hole 102.
By utilizing the pressing of the lower air bag 500 to the inner side wall of the anchor rod drilling hole 102, the clear water can not enter the cement slurry of the anchoring section 204 in the process of injecting clear water subsequently, and the lower air bag 500 is not pressed in the process of placing the isolation plate 600, so that the placing of the isolation plate 600 can not be influenced.
A lower annular space is formed between the inner side of the lower air bag 500 and the anchoring section 204; after grout fills the exterior of the anchor section 204, the bladder 500 expands outwardly under the pressure of the grout disposed in the lower annular space. Thus, the cement paste not only pushes the lower air bag 500 to expand and deform from bottom to top, but also can laterally extrude the lower air bag 500 to expand and deform outwards, namely, the anchoring cement segment is embedded in the lower annular space and pushes the lower air bag 500 from inside to outside.
In this embodiment, the periphery of the lower air bag 500 is provided with the lower abutting rubber strip 501, and the lower abutting rubber strip 501 abuts against the inner side wall of the anchor rod drilling hole 102, so that the lower air bag 500 is prevented from being damaged by friction.
The separator 600 has a top end face facing the free section 203; in the top-down direction, the top end surface of the partition plate 600 is recessed downward to form a top groove; a flat upper air bag 400 which expands and deforms outwards under pressure is arranged in the top groove, the upper air bag 400 surrounds the periphery of the free section 203, and the bottom of the upper air bag 400 is fixedly connected with the top groove;
when cement slurry is injected into the anchor hole 102 through the primary grouting pipe 301, after the free section 203 is filled with the cement slurry, the cement slurry presses the upper air bag 400 from top to bottom to expand and deform outwards, and the outer periphery of the upper air bag 400 presses the inner side wall of the anchor hole 102.
By utilizing the pressing of the upper air bag against the inner side wall of the anchor rod drilling hole 102, the clear water can not enter the cement slurry of the anchoring section 204 completely in the process of injecting clear water, and the upper air bag 400 is not pressed in the process of placing the isolation plate 600 down, so that the lowering of the isolation plate 600 can not be influenced. By utilizing the double-layer of the upper air bag 400 and the lower air bag 500 to press against the inner side wall of the anchor rod drilling hole 102, the outside of the anchoring section 204 can be further isolated from the outside of the free end, and clear water is prevented from entering the outside of the anchoring section 204.
The inner side of the upper air bag 400 is attached to the free section 203, the upper air bag 400 is provided with a top end surface which is arranged upwards, a plurality of hard rings are arranged on the top end surface of the upper air bag 400 and circumferentially arranged along the free section 203, upper ring grooves which are sunken downwards are arranged on the hard rings, and the upper ring grooves extend along the circumferential direction of the hard rings;
after the cement slurry is filled outside the free section 203, the cement slurry presses the hard ring from top to bottom to move downwards, so as to drive the upper air bag 400 to expand and deform outwards, that is, the free cement section is embedded in the upper annular groove and presses the upper air bag 400 from top to bottom.
The cement paste presses the upper air bag 400 and the hard rings on the upper air bag 400, so that the downward expansion and deformation directions of the upper air bag 400 can be further ensured, and the periphery of the upper air bag 400 is rapidly pressed on the inner side wall of the anchor rod drilling hole 102.
Go up the periphery of gasbag 400 and be provided with butt adhesive tape 401, go up butt adhesive tape 401 and support the inside wall that presses anchor rod drilling 102, like this, avoid going up gasbag 400 by the friction damage.
The bottom of the upper abutting rubber strip 401 extends downwards to form a rubber ring 402, when cement paste abuts against the upper air bag 400 to expand outwards, and the upper abutting rubber strip 401 abuts against the inner side wall of the anchor rod drilling hole 102, the rubber ring 402 is embedded into the isolation gap 601, and the isolation gap 601 is sealed. In this way, the insulation effect of the insulation plate 600 is further enhanced, and the swing misalignment of the insulation plate 600 can be restricted.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The prestressed anchor rod anchoring structure for post-grouting of the free section is characterized by comprising an anchor rod drilling hole, an anchor seat and a prestressed anchor rod body inserted into the anchor rod drilling hole, wherein the prestressed anchor rod body sequentially comprises an extension section, a penetrating section, a free section and an anchoring section along the direction of inserting the prestressed anchor rod body into the anchor rod drilling hole; a fixedly arranged isolation plate is arranged between the free section and the anchoring section; a through hole is formed in the anchor seat and is coaxially communicated with the anchor rod drilling hole, an anchorage device is connected to the extension section, and the extension section and the anchor seat are fixed by the anchorage device; the anchoring section extends to the bottom of the anchor rod drilling hole, the free section is arranged in the anchor rod drilling hole, the penetrating section penetrates through the penetrating hole, and the extending section is exposed out of the anchor base;
the prestressed anchor rod body is provided with a primary grouting pipe, the bottom of the primary grouting pipe extends to the bottom of the anchoring section, and the top of the primary grouting pipe is positioned below the anchor seat; the prestressed anchor rod body is provided with a rear grouting pipe, the bottom of the rear grouting pipe extends to the free section and is positioned above the isolation plate, and the top of the rear grouting pipe penetrates through the anchor block and is exposed above the anchor block;
grouting cement into the outside of the anchoring section for the first time through the primary grouting pipe to form an anchoring cement section for anchoring the anchoring section and the stratum, wherein the anchoring cement section wraps the anchoring section; and grouting cement slurry to the outside of the free section and the through hole for the second time through the rear grouting pipe to form a free cement section for anchoring the free section and the stratum, wherein the free cement section wraps the through section and the free section.
2. The prestressed anchor anchoring structure to free-range post-grouting according to claim 1, wherein the bottom of said post-grouting pipe is closed, and a grouting hole is provided at the outer circumference of the lower portion of said post-grouting pipe.
3. The prestressed anchor anchoring structure to free-section post-grouting according to claim 2, wherein a plurality of said grouting holes are provided at the outer circumference of the lower portion of said post-grouting pipe, and are arranged at intervals along the circumference of the post-grouting pipe.
4. The prestressed anchor anchoring structure to free-section post-grouting according to any one of claims 1 to 3, wherein there is a separation gap between the outer periphery of said spacer and the inner side wall of the anchor bore, said spacer having a bottom end face directed toward the anchoring section; along the direction from bottom to top, the bottom end surface of the isolation plate is upwards sunken to form a bottom groove; the anchor rod drilling device is characterized in that a flat lower air bag which is pressed to expand and deform outwards is arranged in the bottom groove, the lower air bag is surrounded on the periphery of the anchoring section, the top of the lower air bag is fixedly connected with the bottom groove, and the periphery of the lower air bag is abutted to the inner side wall of the anchor rod drilling hole.
5. The prestressed anchor anchoring structure to free-section post-grouting according to claim 4, wherein a lower annular space is provided between the inner side of said lower bladder and the anchoring section, and said anchoring cement section is embedded in the lower annular space, pressing the lower bladder from inside to outside.
6. The prestressed anchor anchoring structure to free-section post-grouting according to claim 5, wherein said lower air bag is provided at its periphery with a lower abutment rubber strip which abuts against the inner side wall of the anchor bore hole.
7. The prestressed anchor anchoring structure to free-section post-grouting according to claim 4, wherein said spacer plate has a top end face directed toward the free section; along the direction from top to bottom, the top end surface of the isolation plate is downwards concave to form a top groove; the anchor rod drilling device is characterized in that an upper air bag which is flat and is pressed to expand and deform outwards is arranged in the top groove, the upper air bag is surrounded on the periphery of the free section, the bottom of the upper air bag is fixedly connected with the top groove, and the periphery of the upper air bag is abutted to the inner side wall of the anchor rod drilling hole.
8. The pre-stressed anchor rod anchoring structure for post-grouting of a free section as claimed in claim 7, wherein the inner side of the upper air bag is attached to the free section, the upper air bag has a top end face arranged upward, a plurality of hard rings are arranged on the top end face of the upper air bag, the hard rings are circumferentially arranged along the circumference of the free section, a downward-recessed upper ring groove is arranged on the hard rings, the upper ring groove extends along the circumference of the hard rings, and the free cement section is embedded in the upper ring groove and presses against the upper air bag from top to bottom.
9. The prestressed anchor anchoring construction for post-grouting of a free section as claimed in claim 8, wherein an upper abutment rubber strip is provided on the outer periphery of said upper air bag, said upper abutment rubber strip being pressed against the inner side wall of the anchor hole.
10. The prestressed anchor anchoring structure for free-section post-grouting according to claim 9, wherein a rubber ring extends downward from the bottom of said upper abutting rubber strip, and said rubber ring is embedded in the isolation gap to close said isolation gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245159.4A CN114561941B (en) | 2022-03-13 | 2022-03-13 | Prestressed anchor rod anchoring structure for grouting after free section |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245159.4A CN114561941B (en) | 2022-03-13 | 2022-03-13 | Prestressed anchor rod anchoring structure for grouting after free section |
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| CN114561941A true CN114561941A (en) | 2022-05-31 |
| CN114561941B CN114561941B (en) | 2024-06-14 |
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| CN202210245159.4A Active CN114561941B (en) | 2022-03-13 | 2022-03-13 | Prestressed anchor rod anchoring structure for grouting after free section |
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| CN2756708Y (en) * | 2003-11-08 | 2006-02-08 | 廖小平 | Full length adhesive prestress anchor rod |
| CN108385679A (en) * | 2018-06-01 | 2018-08-10 | 宁波它山奇境文化旅游发展有限公司 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
| CN207739271U (en) * | 2017-12-28 | 2018-08-17 | 中国水利水电科学研究院 | One kind stopping sizing device suitable for rock side slope supporting anchorage cable slip casting |
| CN112360534A (en) * | 2020-12-31 | 2021-02-12 | 昆明理工大学 | Full-anchor grouting anchor rod and anchoring method thereof |
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2022
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| JPH11141273A (en) * | 1997-11-06 | 1999-05-25 | Bridgestone Corp | Discharging device of natural ground consolidation resin material, and natural ground consolidation method using it |
| CN2532119Y (en) * | 2002-03-29 | 2003-01-22 | 长江水利委员会长江科学院 | Prestress anchorage cable positioning slurry-stop ring |
| CN2756708Y (en) * | 2003-11-08 | 2006-02-08 | 廖小平 | Full length adhesive prestress anchor rod |
| CN207739271U (en) * | 2017-12-28 | 2018-08-17 | 中国水利水电科学研究院 | One kind stopping sizing device suitable for rock side slope supporting anchorage cable slip casting |
| CN108385679A (en) * | 2018-06-01 | 2018-08-10 | 宁波它山奇境文化旅游发展有限公司 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
| CN112360534A (en) * | 2020-12-31 | 2021-02-12 | 昆明理工大学 | Full-anchor grouting anchor rod and anchoring method thereof |
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| CN114561941B (en) | 2024-06-14 |
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