CN112681304B - Anchor cable construction method in high-water-pressure soil layer supporting engineering in yellow land area - Google Patents
Anchor cable construction method in high-water-pressure soil layer supporting engineering in yellow land area Download PDFInfo
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- CN112681304B CN112681304B CN202011483999.1A CN202011483999A CN112681304B CN 112681304 B CN112681304 B CN 112681304B CN 202011483999 A CN202011483999 A CN 202011483999A CN 112681304 B CN112681304 B CN 112681304B
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Abstract
The invention discloses an anchor cable construction method in high water pressure soil layer supporting engineering in a loess area, which comprises the following steps: s1: preparation for construction, S2: primary drilling, S3: preliminary grouting, S4: re-drilling, S5: anchor cable installation, S6: anchor hole grouting and S7: waist rail construction, this anchor rope construction method in loess area high water pressure soil layer supporting engineering, mode through drilling many times and grout many times, fix the anchor rope in high water pressure soil layer, fastness when can strengthening the anchor rope and fix, and the thick liquid is at the in-process that fills, can follow earlier from outside again and cooperate the setting of separating the sheathed tube, can make the concrete thick liquid of inlayer, the effect of solidification is better, and form inside and outside separation, make between the mutual noninterference, the in-process of filling in inside, the effect of solidification is fine, the effectual protective effect who improves the anchor rope and use, increase the factor of safety of supporting engineering simultaneously, and the quality when having guaranteed follow-up anchor rope installation, and to the inside support effect.
Description
Technical Field
The invention belongs to the technical field of foundation pit support, and particularly relates to an anchor cable construction method in high-water-pressure soil layer support engineering in a loess area.
Background
In recent years, with the rapid development of infrastructure construction in China, more and more slope projects are involved in projects such as expressways, industrial and civil buildings, urban rail transit, large-scale public facilities, stadiums and the like, wherein slope support becomes a serious difficulty in engineering quality and safety. In deep foundation pit slope support engineering, a support form of piles with prestressed anchor cables or composite soil nailing walls containing prestressed anchor cables is often adopted.
The anchor cable support has the characteristics of large anchoring radius, strong anchoring force, wide reinforcing range and the like, and plays an important role in the process of supporting the side slope of foundation pit excavation engineering. The anchor cable support is that an anchor cable is installed in a soil layer and is grouted to form an anchoring body, and the anchoring force of the anchoring body is transmitted to a foundation pit support structure through a steel strand, so that the stability of the support structure is guaranteed. At present, in the anchor cable technology for high-water-pressure soil layer supporting engineering in loess areas, a hole is generally drilled to form an anchor cable hole before an anchor cable is installed, and the anchor cable is arranged in the anchor cable hole.
Disclosure of Invention
The invention aims to provide an anchor cable construction method in high-water-pressure soil layer supporting engineering in a loess area, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
an anchor cable construction method in high-water-pressure soil layer supporting engineering in a loess area comprises the following steps:
s1: the construction is prepared for the construction of the concrete,
firstly, preparing equipment, tools and auxiliary materials required by construction for standby, and selecting anchor cable positioning holes in a rectangular array on the side wall of an excavated foundation pit;
s2: the hole is initially drilled,
installing a preliminary drilling head on the drilling machine, and starting to perform preliminary drilling at the selected anchor cable positioning hole;
s3: the slurry is primarily grouted into the slurry tank,
firstly, absorbing seepage water in a primary drilled hole by using a water absorbing material and a water absorbing pump, filling a separation sleeve in the middle of the formed hole after absorption, filling a water absorbing auxiliary material between the outer side of the separation sleeve and the hole wall, and grouting between the separation sleeve and the hole wall by using a grouting pump after the water absorbing auxiliary material is filled, so that the water absorbing auxiliary material is wrapped by slurry, and the outer side of the separation sleeve at the opening of the hole is sealed by using a sealing ring;
s4: then the hole is drilled again, and the hole is drilled,
installing the multi-hole anchor disc at a drill bit of the drilling machine, installing a drill rod penetrating through the anchor disc at the drill bit, respectively penetrating a plurality of anchor holes of the anchor disc through the drill rod, placing the anchor disc at an internal opening of the separation sleeve, and drilling the initial drill hole again to form an anchor cable placing hole;
s5: the anchor cable is installed, and the anchor cable is installed,
sequentially placing the prepared anchor cable into the drilled anchor cable placing hole;
s6: the anchor hole is grouted with slurry,
grouting is started from inside to outside to the outer side of the drill rod inside the separation sleeve by using a grouting pump, and in the grouting process, the hollow drill rod is gradually taken out until the drill rod is completely taken out, and the outer side of the anchor cable is completely grouted;
s7: the construction of the waist rail is carried out,
and mounting a waist beam at the position of the anchor cable close to the orifice of the anchor cable hole, filling concrete between the waist beam and the pile to be compact, and performing a tension locking test after construction is finished.
Preferably, in S1, the drilling preparation equipment at least comprises a jet grouting machine, a grouting pump, a suction pump, a construction tool at least comprises a hollow drill pipe, a hollow separation sleeve, an anchor cable, an anchor disc, a waist beam and an annular sealing ring, and the auxiliary materials at least comprise absorbent cotton, absorbent stone and mixed soil slurry.
Preferably, in S2, the depth of the preliminary drilling is one half to one third of the depth of the secondary drilling in S4.
Preferably, in S3, the cement slurry is required to be mixed during grouting, and the prepared cement slurry is PO42.5R cement slurry, with a water-cement ratio of 1: 1.
Preferably, in S4, the anchor disc has the same size as the inner diameter of the separation sleeve, and a through hole for the grouting pipe to pass through is formed in the middle of the anchor disc.
Preferably, in S5, the number of the anchor cables is at least three, the anchor cables are arranged in an annular array, and the anchor cables are made of steel strands.
The invention has the technical effects and advantages that:
1. according to the anchor cable construction method in the high-water-pressure soil layer supporting engineering in the loess area, the anchor cable is fixed in the high-water-pressure soil layer in a mode of multiple drilling and multiple grouting, the firmness of the anchor cable in the fixing process can be enhanced, in the grouting process, the slurry can be firstly discharged from the outside and then discharged from the outside and matched with the arrangement of the separation sleeve, so that the concrete slurry in the inner layer can be better in solidification effect, the inside and outside separation is formed, the mutual interference between the inside and the outside separation is avoided, the solidification effect is good in the internal filling process, and the use protection effect of the anchor cable is effectively improved;
2. according to the anchor cable construction method in the high-water-pressure soil layer supporting engineering in the loess area, in addition, the hole depth of the first drilled hole is smaller than the hole depth of the subsequent anchor cable during positioning, and the auxiliary material and the water absorbing material are filled into the first drilled hole for adsorption treatment, so that the slurry can be quickly solidified when the slurry is poured, the construction speed is increased, the safety factor of the supporting engineering is increased, the quality of the subsequent anchor cable during installation is ensured, and the supporting effect on the inside is achieved.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the contents of the present invention, and it is obvious that the described contents are only a part of the contents of the present invention, and not all of the contents. All other matters which can be obtained by a person skilled in the art without making creative efforts based on the contents of the present invention belong to the protection scope of the present invention.
The invention provides an anchor cable construction method in high water pressure soil layer supporting engineering in a loess area, which comprises the following steps:
s1: the construction is prepared for the construction of the concrete,
firstly, preparing equipment, tools and auxiliary materials required by construction for standby, and selecting anchor cable positioning holes in a rectangular array on the side wall of an excavated foundation pit;
s2: the hole is initially drilled,
installing a preliminary drilling head on the drilling machine, and starting to perform preliminary drilling at the selected anchor cable positioning hole;
s3: the slurry is primarily grouted into the slurry,
firstly, absorbing seepage water in a primary drilled hole by using a water absorbing material and a water absorbing pump, filling a separation sleeve in the middle of the formed hole after absorption, filling a water absorbing auxiliary material between the outer side of the separation sleeve and the hole wall, and grouting between the separation sleeve and the hole wall by using a grouting pump after the water absorbing auxiliary material is filled, so that the water absorbing auxiliary material is wrapped by slurry, and the outer side of the separation sleeve at the opening of the hole is sealed by using a sealing ring;
s4: then the hole is drilled again, and the hole is drilled,
installing the multi-hole anchor disc at a drill bit of the drilling machine, installing a drill rod penetrating through the anchor disc at the drill bit, respectively penetrating a plurality of anchor holes of the anchor disc through the drill rod, placing the anchor disc at an internal opening of the separation sleeve, and drilling the initial drill hole again to form an anchor cable placing hole;
s5: the anchor cable is installed, and the anchor cable is installed,
sequentially placing the prepared anchor cable into the drilled anchor cable placing hole;
s6: the anchor hole is grouted with slurry,
grouting the outer side of the drill rod inside the separation sleeve from inside to outside by using a grouting pump, gradually taking out the hollow drill rod in the grouting process until the drill rod is completely taken out, and completing the complete grouting on the outer side of the anchor cable;
s7: the construction of the waist rail is carried out,
and mounting a waist beam at the position of the anchor cable close to the orifice of the anchor cable hole, filling concrete between the waist beam and the pile to be compact, and performing tension locking test after construction is finished.
Specifically, in S1, the drilling preparation equipment at least includes a jet grouting machine, a grouting pump, a suction pump, and a construction tool at least includes a hollow drill pipe, a hollow separation sleeve, an anchor cable, an anchor disc, a waist beam, and an annular seal ring, and the auxiliary material at least includes absorbent cotton, absorbent stone, and mixed soil slurry.
Specifically, in S2, the depth of the preliminary drilling is one-half to one-third of the depth of the secondary drilling in S4.
Specifically, in S3, the cement slurry needs to be mixed during grouting, and the prepared cement slurry is PO42.5R cement slurry, with a water-cement ratio of 1: 1.
Specifically, in S4, the size of the anchor disc is the same as the inner diameter of the separation sleeve, and a through hole through which the grouting pipe passes is formed in the middle of the anchor disc.
Specifically, in S5, there are at least three groups of anchor cables arranged in an annular array, and the anchor cables are made of steel strands.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. An anchor cable construction method in high water pressure soil layer supporting engineering in a loess area is characterized by comprising the following steps:
s1: the construction is prepared for the construction of the concrete,
firstly, preparing equipment, tools and auxiliary materials required by construction for standby, and selecting anchor cable positioning holes in a rectangular array on the side wall of an excavated foundation pit;
s2: the hole is initially drilled,
installing a preliminary drilling head on the drilling machine, and starting to perform preliminary drilling at the selected anchor cable positioning hole;
s3: the slurry is primarily grouted into the slurry,
firstly, absorbing seepage water in a primary drilled hole by using a water absorbing material and a water absorbing pump, filling a separation sleeve in the middle of the formed hole after absorption, filling a water absorbing auxiliary material between the outer side of the separation sleeve and the hole wall, and grouting between the separation sleeve and the hole wall by using a grouting pump after the water absorbing auxiliary material is filled, so that the water absorbing auxiliary material is wrapped by slurry, and the outer side of the separation sleeve at the opening of the hole is sealed by using a sealing ring;
s4: then the hole is drilled again, and the hole is drilled,
installing the multi-hole anchor plate at a drill bit of a drilling machine, installing a drill rod penetrating through the anchor plate at the drill bit, respectively penetrating a plurality of anchor holes of the anchor plate through the drill rod, placing the anchor plate at an internal opening of the separation sleeve, and drilling the initial drill hole again to form an anchor cable placing hole;
s5: the anchor cable is installed, and the anchor cable is installed,
sequentially placing the prepared anchor cables into the drilled anchor cable placing holes;
s6: the anchor hole is grouted with slurry,
grouting is started from inside to outside to the outer side of the drill rod inside the separation sleeve by using a grouting pump, and in the grouting process, the hollow drill rod is gradually taken out until the drill rod is completely taken out, and the outer side of the anchor cable is completely grouted;
s7: the construction of the waist rail is carried out,
and mounting a waist beam at the position of the anchor cable close to the orifice of the anchor cable hole, filling concrete between the waist beam and the pile to be compact, and performing a tension locking test after construction is finished.
2. The anchor cable construction method in the high water pressure soil layer supporting engineering of the loess area according to claim 1, wherein: s1, the drilling preparation equipment at least comprises a rotary jet drilling machine, an injection pump, a water suction pump and a construction tool, wherein the construction tool at least comprises a hollow drill rod, a hollow separation sleeve, an anchor cable, an anchor disc, a waist beam and an annular sealing ring, and auxiliary materials at least comprise water-absorbing cotton, water-absorbing stone and mixed soil slurry.
3. The anchor cable construction method in the high-water-pressure soil layer supporting engineering of the loess area according to claim 1, wherein: in S2, the depth of the preliminary drilling is one-half to one-third of the depth of the secondary drilling in S4.
4. The anchor cable construction method in the high-water-pressure soil layer supporting engineering of the loess area according to claim 1, wherein: in S3, during grouting, cement slurry needs to be prepared, wherein the prepared cement slurry is PO42.5R cement slurry, and the water-cement ratio is 1: 1.
5. The anchor cable construction method in the high water pressure soil layer supporting engineering of the loess area according to claim 1, wherein: in S4, the size of the anchor disc is the same as the inner diameter of the separation sleeve, and a through hole through which a grouting pipe passes is formed in the middle of the anchor disc.
6. The anchor cable construction method in the high-water-pressure soil layer supporting engineering of the loess area according to claim 1, wherein: in S5, the number of the anchor cables is at least three, the anchor cables are arranged in a ring array, and the anchor cables are made of steel strands.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011483999.1A CN112681304B (en) | 2020-12-16 | 2020-12-16 | Anchor cable construction method in high-water-pressure soil layer supporting engineering in yellow land area |
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| CN202011483999.1A CN112681304B (en) | 2020-12-16 | 2020-12-16 | Anchor cable construction method in high-water-pressure soil layer supporting engineering in yellow land area |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT10280U1 (en) * | 2007-12-21 | 2008-12-15 | Grund & Boden Geotechnik Gmbh | ARRANGEMENT FOR SAFEGUARDING LAUSSEBOLS |
| CN201746840U (en) * | 2010-07-29 | 2011-02-16 | 林华国 | Foundation pit support system equipped with a plurality of inclined rear anchors capable of recycling |
| CN103615011B (en) * | 2013-11-29 | 2016-08-17 | 上海强劲地基工程股份有限公司 | The construction method of anchoring support in high hydraulic pressure soil layer |
| EP3042998B1 (en) * | 2014-12-04 | 2018-12-19 | Gebr. Strab GmbH + Co. | Method for introducing a soil foundation and soil foundation which is produced by said method |
| CN108252737A (en) * | 2017-12-22 | 2018-07-06 | 神华宁夏煤业集团有限责任公司 | The abandoned well sorting technique of bank |
| CN108755676B (en) * | 2018-05-05 | 2020-06-26 | 深圳市蛇口招商港湾工程有限公司 | Anchor cable construction method under water-rich sand layer condition |
| CN111794221B (en) * | 2020-06-28 | 2022-08-30 | 中国水利水电第四工程局有限公司 | Prestressed anchor cable construction method |
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