CN111749246A - Installation method of prestressed anchor cable of water-rich sand layer - Google Patents
Installation method of prestressed anchor cable of water-rich sand layer Download PDFInfo
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- CN111749246A CN111749246A CN202010551447.3A CN202010551447A CN111749246A CN 111749246 A CN111749246 A CN 111749246A CN 202010551447 A CN202010551447 A CN 202010551447A CN 111749246 A CN111749246 A CN 111749246A
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- installation
- sand layer
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- rock stratum
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a method for installing a prestressed anchor cable of a water-rich sand layer, which comprises a field environment exploration stage, a detection stage, an installation scheme making stage and an actual installation stage, and comprises the following installation steps: the method comprises the following steps: and (3) field environment exploration stage: the environment of the installation site is known through field investigation; step two: a detection stage: sampling and detecting the water content of the sand layer and detecting the hardness of the fixed rock stratum; step three: and (3) establishing an installation scheme: an installation scheme is drawn up according to the detection result and the field exploration condition; step four: and (3) an actual installation stage: and carrying out actual construction according to the formulated installation scheme. According to the invention, by specifying a detailed installation scheme before installation, the water content of the sandstone at the installation position and the strength of the fixed rock stratum are analyzed, so that the influence of environment and address factors on the stability of the installed anchor cable in the installation process can be effectively eliminated, and the anchor cable is ensured to be installed more stably.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a method for installing a water-rich sand layer prestressed anchor cable.
Background
The prestressed anchor cable is a cable-shaped support for anchoring the anchor cable in the rock body by adopting a prestressed method and is used for reinforcing the side slope. The anchor cable structure generally comprises an amplitude anchor head, an anchor cable body and an outer anchor head, wherein the anchor cable is anchored into a rock body through a hole of a weak structural surface of the rock body by the anchor head, and a sliding body is connected with a stable rock stratum, so that the stress state of a slope rock body is changed, and the integrity and the strength of an unstable rock body of the slope are improved. When the prestressed anchor cable is constructed, a special tensioning device and a special machine tool are needed.
Through massive search, the prior art is found to be CN106522243B, and the grouting anchoring construction method for the prestressed anchor cables in the fractured rock-soil stratum is disclosed, wherein a plurality of prestressed anchor cables uniformly distributed on the same plane are adopted to reinforce the side slope to be reinforced, and the grouting construction method comprises the following steps: firstly, determining the development degree of rock mass joint fractures of each rock stratum; secondly, determining the length of the anchoring section and the position of an anchor cable hole orifice; the prestressed anchor cable comprises an anchor cable body, a primary grouting pipe and a secondary grouting pipe, wherein an anchorage device is arranged at the rear end of the anchor cable body, and the anchor cable body comprises a plurality of steel strands; thirdly, grouting and anchoring construction of the prestressed anchor cables: when any prestressed anchorage cable is subjected to grouting anchoring construction, the method comprises the following steps: drilling, anchor cable laying, normal pressure grouting, high pressure grouting, anchor cable tensioning and anchor sealing. The method has the advantages of simple steps, reasonable design, simple and convenient construction, high construction efficiency, good use effect, simple and convenient and quick completion of the reinforcement process of the slope to be reinforced, low cost of the adopted prestressed anchor cable, higher anchoring force and effective reinforcement of the slope to be reinforced.
In summary, when the anchor cable is applied to a water-rich sand layer, an effective solution cannot be specified, the problem of non-fitting to an actual installation position exists, and environmental factors have a large influence on an actual installation process, so that the installation stability and the actual usability of the anchor cable are affected.
Disclosure of Invention
The invention aims to provide a method for installing a prestressed anchor cable of a water-rich sand layer, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for installing a prestressed anchor cable of a water-rich sand layer comprises an on-site environment exploration stage, a detection stage, an installation scheme making stage and an actual installation stage, and comprises the following installation steps:
the method comprises the following steps: and (3) field environment exploration stage: the environment of the installation site is known through field investigation;
step two: a detection stage: sampling and detecting the water content of the sand layer and detecting the hardness of the fixed rock stratum;
step three: and (3) establishing an installation scheme: an installation scheme is drawn up according to the detection result and the field exploration condition;
step four: and (3) an actual installation stage: and carrying out actual construction according to the formulated installation scheme.
Preferably, the field environment exploration stage comprises the steps of observing the distribution range of a sand layer and observing the required installation position, so that preliminary planning of an installation scheme is facilitated, preliminary installation layout is planned, and the influence of environmental factors on the installation process in the actual installation process is planned;
the working personnel can record the geological and environmental conditions in the field exploration process and draw a preliminary topographic map and an installation distribution map;
the method can help workers to clearly know the field installation condition through field environment exploration, and an installation plan with less influence of environmental factors on an installation scheme is formulated, so that the implementation of a subsequent installation plan is facilitated.
Preferably, the detection stage needs to detect the water content of the sand layer and the strength of the fixed rock stratum;
the sampling equipment is used for drilling and sampling the sand layer, inspecting the sand layer sample obtained by drilling, detecting the water content in the sand layer, continuously and comprehensively sampling the sand layer at the installation position by adopting a multi-section continuous sampling method, and respectively recording the sampling positions of different sand layers and the water content of the sampled sand layer at corresponding positions, so that the geological condition of the sand layer can be conveniently and actually mastered, and a foundation is provided for subsequent installation plan planning;
the sampling and drilling equipment penetrates through the sand layer to perform drilling and sampling on the fixed rock stratum, the extruder is used for performing strength analysis on the fixed rock stratum, and the fixed rock stratum sampling method adopts a multi-section continuous sampling method to perform comprehensive detection and analysis on the fixed rock stratum.
Preferably, the scheme making stage is a subsequent stage based on more than one of an on-site environment exploration stage and a detection stage;
the first step is as follows: according to the actual environment exploration stage serving as a first basis, according to an actual environment exploration result and a preliminarily drawn drawing, a preliminary installation scheme is formulated, influences of environmental factors on the installation scheme are eliminated, and a further scheme drawing is drawn;
the second step is that: and according to the detection data of the water content of the sand layer and the strength of the fixed rock stratum in the detection stage, as the basis of the installation scheme, the drilling, hole cleaning and cement mark number using difference are designated according to the water content of the sand layer and the strength of the fixed rock stratum, and a further accurate installation scheme is designated.
Preferably, the actual installation stage comprises the steps of determining an installation position, punching, cleaning holes, reinforcing holes, installing and reinforcing; the method comprises the following steps:
the first step is as follows: the constructor determines the installation position of the anchor cable according to the drawing drawn in the scheme making stage;
the second step is that: drilling according to the position of the formulated scheme, and selecting a drilling mode according to the water content of the sand layer and the strength of the fixed rock stratum;
the third step: after drilling, cleaning the anchor hole, reinforcing the inner wall of the anchor hole of the fixed rock stratum, and installing a fixed hole sleeve;
the fourth step: the anchor cable fixing body is placed in an anchor hole of a fixed rock stratum, concrete is poured, and cement mortar of the concrete is cement with 700 or 800 grades if the water content of a sand layer is large, so that the setting time is faster, and the hardness after setting is higher.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a detailed and thorough installation plan is formulated before installation, the environment where the installation is located can be detected in detail, a corresponding installation scheme is specified according to the actual detection condition, and a corresponding drilling mode and a mark number for pouring cement are selected according to different water contents of sand layers and different hardness of fixed rock strata, so that the installation process is less influenced by the environment and address factors, the stability of the installation anchor cable can be effectively improved, and the installation method has higher efficiency and safety stability.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provided by the invention comprises the following steps:
the first embodiment is as follows:
a method for installing a prestressed anchor cable of a water-rich sand layer comprises an on-site environment exploration stage, a detection stage, an installation scheme making stage and an actual installation stage, and comprises the following installation steps:
the method comprises the following steps: and (3) field environment exploration stage: the environment of the installation site is known through field investigation;
step two: a detection stage: sampling and detecting the water content of the sand layer and detecting the hardness of the fixed rock stratum;
step three: and (3) establishing an installation scheme: an installation scheme is drawn up according to the detection result and the field exploration condition;
step four: and (3) an actual installation stage: and carrying out actual construction according to the formulated installation scheme.
The field environment exploration stage comprises the steps of observing the distribution range of a sand layer and observing a required installation position, so that preliminary planning of an installation scheme is facilitated, preliminary installation layout is planned, and the influence of environmental factors on the installation process in the actual installation process is avoided;
the working personnel can record the geological and environmental conditions in the field exploration process and draw a preliminary topographic map and an installation distribution map;
the method can help workers to clearly know the field installation condition through field environment exploration, and an installation plan with less influence of environmental factors on an installation scheme is formulated, so that the implementation of a subsequent installation plan is facilitated.
Example two:
in the detection stage, the water content of the sand layer and the strength of the fixed rock stratum need to be detected;
the sampling device is used for drilling and sampling the sand layer, the sand layer samples obtained by drilling are submitted for inspection, the water content in the sand layer is detected, a multi-section continuous sampling method is adopted for continuously and comprehensively sampling the sand layer at the installation position, and the sampling positions of different sand layers and the water content of the sampled sand layer at the corresponding position are respectively recorded, so that the geological condition of the sand layer can be conveniently and practically mastered, and a foundation is provided for subsequent installation plan planning;
the sampling drilling equipment penetrates through the sand layer to perform drilling sampling on the fixed rock stratum, an extruder is adopted to perform strength analysis on the fixed rock stratum, and a multi-section continuous sampling method is adopted in the fixed rock stratum sampling method to perform comprehensive detection and analysis on the fixed rock stratum;
different equipment is selected according to the difference of sampling to the sampling equipment, when sampling sand bed and fixed bed, can select the drilling formula sampler, when the fixed stratum of sampling, need change the higher drilling rod of intensity, and after the drilling, the sample core of sand bed and fixed stratum is taken out in the drilling rod through the sampler, is convenient for carry out the measuring of rich water volume and fixed stratum intensity.
The scheme making stage is a subsequent stage which is based on more than an on-site environment exploration stage and a detection stage;
the first step is as follows: according to the actual environment exploration stage serving as a first basis, according to an actual environment exploration result and a preliminarily drawn drawing, a preliminary installation scheme is formulated, influences of environmental factors on the installation scheme are eliminated, and a further scheme drawing is drawn;
the second step is that: and according to the detection data of the water content of the sand layer and the strength of the fixed rock stratum in the detection stage, as the basis of the installation scheme, the drilling, hole cleaning and cement mark number using difference are designated according to the water content of the sand layer and the strength of the fixed rock stratum, and a further accurate installation scheme is designated.
The actual installation stage comprises the steps of determining an installation position, punching, cleaning holes, reinforcing holes, installing and reinforcing; the method comprises the following steps:
the first step is as follows: the constructor determines the installation position of the anchor cable according to the drawing drawn in the scheme making stage;
the second step is that: drilling according to the position of the formulated scheme, and selecting a drilling mode according to the water content of the sand layer and the strength of the fixed rock stratum;
the third step: after drilling, cleaning the anchor hole, reinforcing the inner wall of the anchor hole of the fixed rock stratum, and installing a fixed hole sleeve;
the fourth step: placing the fixing body of the anchor cable in an anchor hole of a fixed rock stratum, pouring concrete, and if the water content of a sand layer is larger, selecting cement mortar of 700 or 800 grades as cement mortar of the concrete, wherein the setting time is faster, and the hardness after setting is higher;
the higher the cement mark is, the higher the hardness is after solidification, and the concrete that chooses in the casting process adopts portland cement, possesses faster solidification speed and intensity after solidification, can be effectual fixes inside the anchor eye to the anchor rope anchor, provides the foundation for the anchor rope.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. The installation method of the prestressed anchor cable of the water-rich sand layer comprises a field environment exploration stage, a detection stage, an installation scheme making stage and an actual installation stage, and is characterized in that: the method comprises the following installation steps:
the method comprises the following steps: and (3) field environment exploration stage: the environment of the installation site is known through field investigation;
step two: a detection stage: sampling and detecting the water content of the sand layer and detecting the hardness of the fixed rock stratum;
step three: and (3) establishing an installation scheme: an installation scheme is drawn up according to the detection result and the field exploration condition;
step four: and (3) an actual installation stage: and carrying out actual construction according to the formulated installation scheme.
2. The method for installing the pre-stressed anchor cable in the water-rich sand layer as claimed in claim 1, wherein: the field environment exploration stage comprises the steps of observing the distribution range of a sand layer and observing a required installation position, so that preliminary planning of an installation scheme is facilitated, preliminary installation layout is planned, and the influence of environmental factors on the installation process in the actual installation process is planned;
the working personnel can record the geological and environmental conditions in the field exploration process and draw a preliminary topographic map and an installation distribution map;
the method can help workers to clearly know the field installation condition through field environment exploration, and an installation plan with less influence of environmental factors on an installation scheme is formulated, so that the implementation of a subsequent installation plan is facilitated.
3. The method for installing the pre-stressed anchor cable in the water-rich sand layer as claimed in claim 1, wherein: in the detection stage, the water content of the sand layer and the strength of the fixed rock stratum need to be detected;
the sampling equipment is used for drilling and sampling the sand layer, inspecting the sand layer sample obtained by drilling, detecting the water content in the sand layer, continuously and comprehensively sampling the sand layer at the installation position by adopting a multi-section continuous sampling method, and respectively recording the sampling positions of different sand layers and the water content of the sampled sand layer at corresponding positions, so that the geological condition of the sand layer can be conveniently and actually mastered, and a foundation is provided for subsequent installation plan planning;
the sampling and drilling equipment penetrates through the sand layer to perform drilling and sampling on the fixed rock stratum, the extruder is used for performing strength analysis on the fixed rock stratum, and the fixed rock stratum sampling method adopts a multi-section continuous sampling method to perform comprehensive detection and analysis on the fixed rock stratum.
4. The method for installing the pre-stressed anchor cable in the water-rich sand layer as claimed in claim 1, wherein: the scheme making stage is a subsequent stage which is based on more than an on-site environment exploration stage and a detection stage;
the first step is as follows: according to the actual environment exploration stage serving as a first basis, according to an actual environment exploration result and a preliminarily drawn drawing, a preliminary installation scheme is formulated, influences of environmental factors on the installation scheme are eliminated, and a further scheme drawing is drawn;
the second step is that: and according to the detection data of the water content of the sand layer and the strength of the fixed rock stratum in the detection stage, as the basis of the installation scheme, the drilling, hole cleaning and cement mark number using difference are designated according to the water content of the sand layer and the strength of the fixed rock stratum, and a further accurate installation scheme is designated.
5. The method for installing the pre-stressed anchor cable in the water-rich sand layer as claimed in claim 1, wherein: the actual installation stage comprises the steps of determining an installation position, punching, cleaning holes, reinforcing holes, installing and reinforcing; the method comprises the following steps:
the first step is as follows: the constructor determines the installation position of the anchor cable according to the drawing drawn in the scheme making stage;
the second step is that: drilling according to the position of the formulated scheme, and selecting a drilling mode according to the water content of the sand layer and the strength of the fixed rock stratum;
the third step: after drilling, cleaning the anchor hole, reinforcing the inner wall of the anchor hole of the fixed rock stratum, and installing a fixed hole sleeve;
the fourth step: the anchor cable fixing body is placed in an anchor hole of a fixed rock stratum, concrete is poured, and cement mortar of the concrete is cement with 700 or 800 grades if the water content of a sand layer is large, so that the setting time is faster, and the hardness after setting is higher.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010551447.3A CN111749246A (en) | 2020-06-17 | 2020-06-17 | Installation method of prestressed anchor cable of water-rich sand layer |
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| CN202010551447.3A CN111749246A (en) | 2020-06-17 | 2020-06-17 | Installation method of prestressed anchor cable of water-rich sand layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802566A (en) * | 2021-09-28 | 2021-12-17 | 北京住总集团有限责任公司 | Prestressed anchor cable support for water-rich sand foundation pit and construction method |
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| CN108755676A (en) * | 2018-05-05 | 2018-11-06 | 深圳市蛇口招商港湾工程有限公司 | Anchor cable construction method under the conditions of rich aquifer sand layer |
| CN110306574A (en) * | 2019-07-18 | 2019-10-08 | 广东厚普建设工程有限公司 | A kind of construction prestressed cable method |
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2020
- 2020-06-17 CN CN202010551447.3A patent/CN111749246A/en active Pending
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| CN102535462A (en) * | 2012-03-16 | 2012-07-04 | 广州中煤江南基础工程公司 | Method for constructing anchor cable on sand layer |
| JP2017128878A (en) * | 2016-01-19 | 2017-07-27 | 株式会社トーヨーアサノ | Construction method of precast pile |
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| CN113802566A (en) * | 2021-09-28 | 2021-12-17 | 北京住总集团有限责任公司 | Prestressed anchor cable support for water-rich sand foundation pit and construction method |
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