CN114561943A - Construction method for anchoring pre-stressed anchor rod body for free section post-grouting - Google Patents
Construction method for anchoring pre-stressed anchor rod body for free section post-grouting Download PDFInfo
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- CN114561943A CN114561943A CN202210245175.3A CN202210245175A CN114561943A CN 114561943 A CN114561943 A CN 114561943A CN 202210245175 A CN202210245175 A CN 202210245175A CN 114561943 A CN114561943 A CN 114561943A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 92
- 239000002002 slurry Substances 0.000 claims abstract description 51
- 238000005553 drilling Methods 0.000 claims abstract description 47
- 238000002955 isolation Methods 0.000 claims abstract description 36
- 230000000149 penetrating effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000007865 diluting Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 239000011440 grout Substances 0.000 claims description 9
- 238000007569 slipcasting Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 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
- -1 thus 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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- 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 body anchoring construction method for free section post grouting, which comprises the following construction steps: 1) the pre-stressed anchor rod body is provided with a primary grouting pipe and a rear grouting pipe; 2) placing the pre-stressed anchor rod body in the anchor rod drilling hole; 3) injecting cement slurry into the anchor rod drill hole through the primary grouting pipe, injecting clear water into the anchor rod drill hole through the rear grouting pipe, diluting the cement slurry outside the free section and the cement slurry in the through hole to set requirements by the clear water, and isolating the clear water from flowing to the cement slurry outside the anchoring section by the isolation plate; 4) when the cement slurry outside the anchoring section is solidified to the set requirement, stretching the rod body of the prestressed anchor rod, and fixing the extension section and the anchor seat by using an anchorage device (a clamping piece and an anchor plate); 5) injecting cement slurry into the anchor rod drill hole through the rear grouting pipe, wherein the cement slurry wraps the penetrating section and the free section; the cement slurry injected later plays a role in corrosion prevention, and is bonded with the surrounding stratum, so that the free section generates bonding force.
Description
Technical Field
The invention relates to the technical field of prestressed anchor rod bodies, in particular to a prestressed anchor rod body anchoring construction method 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 installation of the prestressed anchor rod body, be full of cement slurry in the stock drilling, the through hole of anchorage base is empty, after the installation ground tackle, utilize jack stretch-draw locking prestressed anchor rod body, during stretch-draw, the prestressed anchor rod body receives the effect of pulling force and can warp the extension, during the locking, the epitaxial section of locking is gripped to the ground tackle, because the surface of epitaxial section can not have anticorrosive lubricating oil, thus, just need to peel off the sleeve pipe of the section of extending and the section of wearing to establish within a certain length range, wash clean anticorrosive lubricating oil, thus, lead to wearing to establishing the section and being exposed in wearing to establish the 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 body anchoring construction method for post-grouting of a free section, and aims to solve the problem that a penetrating section of a prestressed anchor rod body is in an exposed state in the prior art.
The invention is realized in this way, the construction method of anchoring the pre-stressed anchor rod body of post-grouting of the free section comprises the following construction steps:
1) manufacturing a pre-stressed anchor rod body, and inserting the pre-stressed anchor rod body into the anchor rod drilling direction, wherein the pre-stressed anchor rod body sequentially comprises an extension section, a penetrating section, a free section and an anchoring section; a fixedly arranged isolation plate is arranged between the free section and the anchoring section; 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 extends to the extension section;
2) arranging an anchor seat, wherein a through hole is formed in the anchor seat, the through hole is coaxially communicated with the anchor rod drilling hole, and an anchorage device is connected to the extension section; placing the prestressed anchor rod body in an anchor rod drilling hole, wherein the anchoring section extends to the bottom of the anchor rod drilling hole, the free section is placed in the anchor rod drilling hole, the penetrating section is penetrated in the penetrating hole, the extending section is exposed outside the anchor seat, and the top of the rear grouting pipe penetrates through the anchor seat and is exposed above the anchor seat;
3) injecting cement slurry into the anchor rod drilling hole through the primary grouting pipe until the anchor rod drilling hole and the through hole are filled with the cement slurry; injecting clear water into the anchor rod drill hole through the rear grouting pipe, diluting the cement paste outside the free section and the cement paste in the through hole to set requirements by the clear water, and isolating the clear water from flowing to the cement paste outside the anchoring section by the isolation plate;
4) after cement slurry outside the anchoring section is solidified to a set requirement to form an anchoring cement section for fixing the anchoring section, tensioning a prestressed anchor rod body outwards by using a jack, and after the free section and the penetrating section are tensioned and extended to the set requirement, fixing the extending section and the anchor seat by using an anchor;
5) and injecting cement slurry into the anchor rod drilling hole through the rear grouting pipe until the cement slurry is full of the outside of the free section and the penetrating hole, and the cement slurry wraps the penetrating section and the free section.
Further, in the construction step 3), after cement slurry is injected into the anchor rod drill hole through the primary grouting pipe at high pressure, clean water is injected into the anchor rod drill hole through the rear grouting pipe at low pressure.
Furthermore, the bottom of back slip casting pipe is sealed and is arranged, the periphery of the lower part of back slip casting pipe is equipped with a plurality of injected holes, and a plurality of injected holes are arranged along back slip casting pipe's circumference interval.
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; a flat lower air bag which is expanded and deformed outwards under pressure is arranged in the bottom groove, the lower air bag is surrounded on the periphery of the anchoring section, and the top of the lower air bag is fixedly connected with the bottom groove;
in construction step 3), when grout is poured into to the stock drilling in the slip casting pipe once, after the outside of anchor section is full of grout, air pocket outwards expansion deformation is pressed down to grout from bottom to top, the inside wall in stock drilling is being propped to the periphery of air pocket down.
Further, a lower annular space is formed between the inner side of the lower air bag and the anchoring section; in the construction step 3), after the cement paste is filled outside the anchoring section, the cement paste arranged in the lower annular space extrudes the lower air bag to expand and deform outwards.
Further, the periphery of the lower air bag is provided with a lower abutting rubber strip, and in the construction step 3), after the lower air bag is extruded and expanded outwards, the lower abutting rubber strip abuts against the inner side wall of the anchor rod drilling hole.
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 top groove is internally provided with a flat upper air bag which is expanded and deformed outwards under pressure, the upper air bag surrounds the periphery of the free section, and the bottom of the upper air bag is fixedly connected with the top groove;
in the construction step 3), when cement paste is injected into the anchor rod drill hole through the primary grouting pipe, after the free section is filled with the cement paste, the cement paste is pressed against the upper air bag from top to bottom to expand and deform outwards, and the periphery of the upper air bag is abutted against the inner side wall of the anchor rod drill hole.
Furthermore, the inner side of the upper air bag is connected with the free section in a fitting manner, the upper air bag 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 in a surrounding manner along the circumferential direction of the free section, 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; in the construction step 3), after the cement paste is filled outside the free section, the cement paste presses the hard ring from top to bottom to move downwards, and the upper air bag is driven to expand and deform outwards.
Furthermore, the periphery of the upper air bag is provided with an upper abutting rubber strip, and in the construction step 3), after the upper air bag is extruded and expanded outwards, the upper abutting rubber strip abuts against the inner side wall of the anchor rod drilling hole.
Further, the bottom of going up the butt adhesive tape extends downwards and has glued the ring, in construction step 3), air bag outwards expansion is pressed to the grout top, and goes up the butt adhesive tape butt on the inside wall of stock drilling after, the embedding of glue ring is in keeping apart the clearance, the shutoff keep apart the clearance.
Compared with the prior art, the construction method for anchoring the rod body of the prestressed anchor rod by grouting after the free section provided by the invention comprises the steps of firstly injecting cement slurry into the drilled hole of the anchor rod, and the cement paste outside the free section and in the through holes is diluted by clear water, and the cement paste outside the anchoring section is under the isolation action of the isolation plate, it can not be diluted, so that the cement paste outside the anchoring section can be firstly solidified into the anchoring cement section, after the prestressed anchor rod body is tensioned, the rear grouting pipe is utilized to inject cement slurry into the outer part of the free section and the through hole again, the free section and the through section can be wrapped by the cement slurry which is injected later, so that the anti-corrosion protection effect is achieved, the cement slurry which is injected later is bonded with the surrounding stratum, and the free section generates bonding force, if the penetrating section is corroded and damaged, the free section cannot be damaged, and the corrosion resistance of the rod body of the prestressed anchor rod is greatly improved.
Drawings
FIG. 1 is a flow chart of a construction method for anchoring a pre-stressed anchor rod body for post-grouting of a free section according to the present invention;
FIG. 2 is a schematic front view of the construction method for anchoring the pre-stressed anchor rod body by post-grouting in the free section according to the present invention;
fig. 3 is an enlarged schematic view at a in fig. 2.
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 do not limit the invention.
The following describes the implementation of the present invention in detail with reference 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 description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, 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 it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to the specific situation.
Referring to fig. 1-3, preferred embodiments of the present invention are shown.
The construction method for anchoring the post-grouting prestressed anchor rod body of the free section comprises 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, 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 positioned above the isolation plate 600, and the top of the rear grouting pipe 300 extends to the extension section 201;
2) arranging an anchor seat 100, wherein 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 102 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 to form an anchoring cement section for fixing the anchoring section 204, tensioning the rod body of the prestressed anchor rod outwards by using a jack, and after the free section 203 and the penetrating section 202 are tensioned and extended to the set requirement, fixing the extension section 201 and the anchor seat 100 by using an anchor 101;
5) and injecting cement slurry into the anchor rod drilling hole 102 through the rear grouting pipe 300 until the cement slurry is filled with the outside of the free section 203 and the penetrating hole 103, and the penetrating section 202 and the free section 203 are wrapped by the cement slurry.
The construction method for anchoring the pre-stressed anchor rod body by grouting after the free section provided above comprises the steps of firstly injecting cement slurry into the anchor rod drilling hole 102, and the cement paste outside the free section 203 and in the through hole 103 is diluted by clear water, and under the isolation action of the isolation plate 600, the cement paste outside the anchoring section 204, it will not be diluted, so that the grout outside the anchor section 204 can be set first into an anchor cement section, after the prestressed anchor rod body is tensioned, the rear grouting pipe 300 is utilized to inject cement slurry into the outer part of the free section 203 and the penetrating hole 103 again, the free section 203 and the penetrating section 202 can be wrapped by the cement slurry which is injected later, so that the anti-corrosion protection effect is achieved, the cement slurry which is injected later is bonded with the surrounding stratum, and the free section 203 generates bonding force, if the penetrating section 202 is corroded and damaged, the free section 203 cannot be damaged, and the corrosion resistance of the prestressed anchor rod body is greatly improved.
In the construction step 3), after cement slurry is injected into the anchor rod drill hole 102 through the primary grouting pipe 301 at high pressure, clear water is injected into the anchor rod drill hole 102 through the primary grouting pipe 301 at low pressure, and clear water is injected at low pressure, so that the clear water is prevented from penetrating through the isolation plate 600 and diluting 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 a plurality of injected holes, and a plurality of injected holes are arranged along the circumference interval of back slip casting pipe 300, like this, avoids clear water from the bottom blowout of back slip casting pipe 300, but from the periphery blowout, reduces the clear water and passes the probability that division board 600 gets into the outside grout of anchor section 204.
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 paste is injected into the anchor bolt hole 102 through the primary grouting pipe 301, after the anchoring section 204 is filled with the cement paste, the cement paste 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 bolt hole 102.
By utilizing the pressing of the lower air bag 500 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 in the process of injecting the clear water, and the lower air bag 500 is not pressed in the process of lowering the isolation plate 600, so that the lowering 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; in the construction step 3), after the cement paste is filled outside the anchoring section 204, the air bag 500 is expanded and deformed outwards under the squeezing of the cement paste in the lower annular space. Therefore, the cement paste pushes the lower air bag 500 to expand and deform from bottom to top, and the cement paste embedded in the lower annular space can be laterally extruded to expand and deform the lower air bag 500 outwards.
In this embodiment, the periphery of the lower air bag 500 is provided with the lower abutting rubber strip 501, and in the construction step 3), after the lower air bag 500 is extruded and expanded outwards, 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;
in the construction step 3), when cement slurry is injected into the anchor bolt drilling hole 102 through the primary grouting pipe 301, after the cement slurry is filled outside the free section 203, 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 bolt drilling 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; in the construction step 3), after the cement paste is filled outside the free section 203, the cement paste presses the hard ring from top to bottom to move downwards, and the upper air bag 400 is driven to expand and deform outwards.
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.
The periphery of the upper air bag 400 is provided with an upper abutting rubber strip 401, and in the construction step 3), after the upper air bag 400 is extruded and expanded outwards, the upper abutting rubber strip 401 abuts against the inner side wall of the anchor rod drilling hole 102, so that the upper air bag 400 is prevented from being damaged by friction.
The bottom of the upper abutting rubber strip 401 extends downwards to form a rubber ring 402, in the construction step 3), 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 to block the isolation gap 601. 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 construction method for anchoring the post-grouting prestressed anchor rod body of the free section is characterized by comprising the following construction steps of:
1) manufacturing a pre-stressed anchor rod body, and inserting the pre-stressed anchor rod body into the anchor rod drilling direction, wherein the pre-stressed anchor rod body sequentially comprises an extension section, a penetrating section, a free section and an anchoring section; a fixedly arranged isolation plate is arranged between the free section and the anchoring section; 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 extends to the extension section;
2) arranging an anchor seat, wherein a through hole is formed in the anchor seat, the through hole is coaxially communicated with the anchor rod drilling hole, and an anchorage device is connected to the extension section; placing the prestressed anchor rod body in an anchor rod drilling hole, wherein the anchoring section extends to the bottom of the anchor rod drilling hole, the free section is placed in the anchor rod drilling hole, the penetrating section is penetrated in the penetrating hole, the extending section is exposed outside the anchor seat, and the top of the rear grouting pipe penetrates through the anchor seat and is exposed above the anchor seat;
3) injecting cement slurry into the anchor rod drilling hole through the primary grouting pipe until the anchor rod drilling hole and the through hole are filled with the cement slurry; injecting clear water into the anchor rod drill hole through the rear grouting pipe, diluting the cement paste outside the free section and the cement paste in the through hole to set requirements by the clear water, and isolating the clear water from flowing to the cement paste outside the anchoring section by the isolation plate;
4) after cement slurry outside the anchoring section is solidified to a set requirement to form an anchoring cement section for fixing the anchoring section, tensioning a prestressed anchor rod body outwards by using a jack, and after the free section and the penetrating section are tensioned and extended to the set requirement, fixing the extending section and the anchor seat by using an anchor;
5) and injecting cement slurry into the anchor rod drilling hole through the rear grouting pipe until the cement slurry is full of the outside of the free section and the penetrating hole, and the cement slurry wraps the penetrating section and the free section.
2. The method of claim 1, wherein in the step 3), after the primary grouting pipe injects cement slurry into the anchor bore hole at a high pressure, the post grouting pipe injects clean water into the anchor bore hole at a low pressure.
3. The method of claim 1, wherein the post-grouting pipe is closed at the bottom thereof, and a plurality of grouting holes are formed in the outer circumference of the lower portion of the post-grouting pipe, the plurality of grouting holes being spaced apart from each other in the circumferential direction of the post-grouting pipe.
4. The method of anchoring a prestressed anchor rod body to free-range post-grouting according to any one of claims 1 to 3, wherein an isolation gap is provided between the outer periphery of said isolation plate and the inner side wall of said anchor bore hole, said isolation plate having a bottom end face directed toward said 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; a flat lower air bag which is expanded and deformed outwards under pressure is arranged in the bottom groove, the lower air bag surrounds the periphery of the anchoring section, and the top of the lower air bag is fixedly connected with the bottom groove;
in construction step 3), when grout is poured into to the stock drilling in the slip casting pipe once, after the outside of anchor section is full of grout, air pocket outwards expansion deformation is pressed down to grout from bottom to top, the inside wall in stock drilling is being propped to the periphery of air pocket down.
5. The method of claim 4, wherein a lower annular space is formed between the inner side of the lower air bag and the anchoring section; in the construction step 3), after the cement paste is filled outside the anchoring section, the cement paste arranged in the lower annular space extrudes the lower air bag to expand and deform outwards.
6. The method of claim 5, wherein a lower abutment rubber strip is disposed on the outer periphery of the lower air bag, and in the step 3), the lower abutment rubber strip abuts against the inner side wall of the anchor hole after the lower air bag is extruded and expanded outwards.
7. The method of claim 4, wherein the spacer has a top 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 top groove is internally provided with a flat upper air bag which is expanded and deformed outwards under pressure, the upper air bag surrounds the periphery of the free section, and the bottom of the upper air bag is fixedly connected with the top groove;
in the construction step 3), when cement paste is injected into the anchor rod drill hole through the primary grouting pipe, after the free section is filled with the cement paste, the cement paste is pressed against the upper air bag from top to bottom to expand and deform outwards, and the periphery of the upper air bag is abutted against the inner side wall of the anchor rod drill hole.
8. The method 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 an upward top end surface, the top end surface of the upper air bag is provided with a plurality of hard rings, the hard rings are circumferentially arranged along the free section, the hard rings are provided with downward concave upper ring grooves, and the upper ring grooves extend along the circumferential direction of the hard rings; in the construction step 3), after the cement paste is filled outside the free section, the cement paste presses the hard ring from top to bottom to move downwards, and the upper air bag is driven to expand and deform outwards.
9. The method of claim 8, wherein an upper contact rubber strip is disposed on the outer circumference of the upper air bag, and in the step 3), the upper contact rubber strip is pressed against the inner side wall of the anchor hole after the upper air bag is extruded and expanded outwards.
10. The method of claim 9, wherein a rubber ring extends downward from the bottom of the upper contact rubber strip, and in the step 3), when the cement slurry presses the upper air bag to expand outward and the upper contact rubber strip abuts against the inner side wall of the anchor hole, the rubber ring is embedded in the isolation gap to block the isolation gap.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245175.3A CN114561943A (en) | 2022-03-13 | 2022-03-13 | Construction method for anchoring pre-stressed anchor rod body for free section post-grouting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210245175.3A CN114561943A (en) | 2022-03-13 | 2022-03-13 | Construction method for anchoring pre-stressed anchor rod body for free section post-grouting |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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