CN111139841B - Construction method for bedding slope steep dip excavation and anchor rod reinforcing structure - Google Patents
Construction method for bedding slope steep dip excavation and anchor rod reinforcing structure Download PDFInfo
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- CN111139841B CN111139841B CN201911385500.0A CN201911385500A CN111139841B CN 111139841 B CN111139841 B CN 111139841B CN 201911385500 A CN201911385500 A CN 201911385500A CN 111139841 B CN111139841 B CN 111139841B
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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
- E02D17/20—Securing of slopes or inclines
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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 Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
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Abstract
A construction method for steep-dip excavation of bedding slope and anchor rod reinforcing structure comprises the following steps: firstly, determining slope elevations and plane positions such as a top slope line and the like of steep excavation of an bedding side slope; constructing prestressed anchor rods on the slope surface above the excavated slope crest line and below the excavated slope crest line; thirdly, constructing and excavating frame beam reinforced concrete at the outer end of the prestressed anchor rod above the top slope line; fourthly, excavating the steeply-inclined excavation body reinforced by the prestressed anchor rod to the position of the excavation contour line; constructing frame beam reinforced concrete at the outer end of the prestressed anchor rod; sixthly, excavating a bedding excavation body which can be constructed bedding below the slope surface in a grading way; seventhly, constructing a prestressed anchor rod in the steep excavation body on the inner side of the grading section; eighthly, after the prestress anchor rods of the excavation grading section are reinforced, the steeply-inclined excavation body is arranged at the position of the excavation contour line of the grading section; ninthly, constructing frame beam reinforced concrete at the outer end of the prestressed anchor rod; and c, repeating the steps from left to right until the construction of the prestressed anchor rods and the frame beams of all the graded section side slopes is completed.
Description
Technical Field
The invention relates to geotechnical engineering, in particular to a construction method for bedding slope steep dip excavation and anchor rod reinforcing structure.
Background
The bedding slope is very common in engineering, when engineering construction is limited by land, steep-dip excavation of the bedding slope is needed to meet engineering requirements, which brings great difficulty to slope excavation and reinforcement, because even if the construction mode of bedding slope excavation is adopted, if support reinforcement is not timely, slope instability is easily caused, which is the most accident situation in the current cutting excavation engineering, if steep-dip excavation is adopted for the bedding slope, and when a pre-reinforcing pile measure is not adopted, the stability difficulty of the excavated slope is ensured to be extremely high, so that the construction method for the proper steep-dip excavation of the bedding slope and the anchor rod reinforcing structure has important significance, and has the characteristics of convenience in construction, rapidness, economy, environmental protection, contribution to popularization and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for bedding slope steep dip excavation and anchor rod reinforcing structure, which is used for effectively improving the stability of the side slope in the excavation process and after excavation and reinforcement, is simple to operate and is beneficial to improving the excavation construction efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses a construction method for steep-dip excavation of bedding slope and anchor rod reinforcing structure, which comprises the following steps:
determining slope top lines of steep-dip excavation of bedding side slopes, excavation temporary small steps, side slope middle platforms and slope elevation and plane positions of side slope excavation contour lines;
constructing prestressed anchor rods on the slope surface with the excavation thickness less than 3m above and below the excavation slope crest line;
thirdly, constructing and excavating frame beam reinforced concrete at the outer end of the prestressed anchor rod above the top slope line, and fixedly connecting the reinforcing steel bars of the frame beam with the outer end of the prestressed anchor rod;
fourthly, excavating the steeply-inclined excavation body reinforced by the prestressed anchor rod to the position of the excavation contour line;
cutting off the outer end of the overlong prestressed anchor rod, constructing frame beam reinforced concrete at the outer end of the prestressed anchor rod, and fixedly connecting the reinforcing steel bars of the frame beam with the outer end of the prestressed anchor rod;
excavating bedding excavation bodies which can be constructed bedding below the slope surface in a grading way until the inner side has no bedding excavation condition;
seventhly, constructing a prestressed anchor rod in the steep excavation body on the inner side of the grading section;
eighthly, after the prestress anchor rods of the excavation grading section are reinforced, the steeply-inclined excavation body is arranged at the position of the excavation contour line of the grading section;
ninthly, cutting off the overlong outer end of the prestressed anchor rod, constructing frame beam reinforced concrete at the outer end of the prestressed anchor rod, and fixedly connecting reinforcing steel bars of the frame beam with the outer end of the prestressed anchor rod;
and c, repeating the step c to the step n until the construction of the prestressed anchor rods and the frame beams of all the graded section side slopes is completed.
The prestressed anchor rod is composed of an outer end bonding section, an inner end bonding section and a middle free section, reinforcing steel bars of the inner end bonding section and the outer end bonding section are directly contacted with mortar, and the middle free section is coated with anti-corrosion oil and is protected in a sealing mode by a sleeve; when the prestressed anchor rod is constructed, the inner end bonding section is subjected to pressure grouting, and after the strength of the mortar on the inner side reaches 80% of the designed strength, the middle free section and the outer end bonding section on the outer side are subjected to pressure grouting and mortar solidification in a tensioning state.
The method has the advantages that the steep-dip excavation body part of the bedding side slope is firstly reinforced by the prestressed anchor rods and then excavated, and the rock body of the inner side slope is always in an active stress state, so that the stability is good; because the prestressed anchor rod is provided with the inner end bonding section, the outer end bonding section and the middle free section for applying prestress, the bedding slope rock body is always in a favorable stress state, so that the influence of steep dip excavation body construction, frame beam delayed stress and general blasting excavation on the outer side on the stability of the slope after steep dip excavation is small; the construction method is simple to operate, high in excavation construction efficiency, good in stability of the excavation process and the side slope after excavation reinforcement, good in environmental protection performance and beneficial to popularization and application.
Drawings
The specification includes the following seven drawings:
fig. 1 to 6 are schematic views illustrating a construction process of a method for steep dip excavation of a bedding slope and construction of an anchor rod reinforcing structure according to the present invention;
FIG. 7 is a schematic view of a prestressed anchor.
The component names and corresponding labels are shown in the figure: the device comprises a prestressed anchor rod 1, an inner end bonding section 11a, an outer end bonding section 11B, a middle free section 12, a frame beam 2, a steep-dip excavation body 3, a bedding excavation body 4, a bedding occurrence line A, an inner side bedding influence line B, an excavation contour line C and a slope surface line D.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1 to 6, the invention relates to a construction method for steep excavation of bedding slope and anchor rod reinforcement structure, which comprises the following steps:
determining slope elevation and plane positions of a slope top line of steep-dip excavation of a bedding side slope, an excavated temporary small step, a side slope middle platform and a side slope excavation contour line C;
constructing a prestressed anchor rod 1 on a slope surface with the excavation thickness less than 3m above and below an excavation slope top line;
thirdly, constructing and excavating the frame beam 2 reinforced concrete at the outer end of the prestressed anchor rod 1 above the top slope line, and fixedly connecting the reinforcing steel bars of the frame beam 2 with the outer end of the prestressed anchor rod 1;
fourthly, excavating the steep-dip excavation body 3 reinforced by the prestressed anchor rod 1 to the position of an excavation contour line C;
cutting off the outer end of the overlong prestressed anchor rod 1, constructing the frame beam 2 reinforced concrete at the outer end of the prestressed anchor rod 1, and fixedly connecting the reinforcing steel bars of the frame beam 2 with the outer end of the prestressed anchor rod 1;
excavating a bedding excavation body 4 which can be constructed bedding below the slope surface in a grading way until the inner side has no bedding excavation condition;
seventhly, constructing a prestressed anchor rod 1 in the steep excavation body 3 on the inner side of the grading section;
eighthly, excavating a steep-dip excavating body 3 reinforced by the prestress anchor rods 1 of the grading section to the position of the excavating contour line of the grading section;
ninthly, cutting off the overlong outer end of the prestressed anchor rod 1, constructing the frame beam 2 reinforced concrete at the outer end of the prestressed anchor rod 1, and fixedly connecting the reinforcing steel bars of the frame beam 2 with the outer end of the prestressed anchor rod 1;
and c, repeating the step c to the step c at the front part until the construction of the prestressed anchor rods 1 and the frame beams 2 of all the graded section side slopes is completed.
The construction height of the grading section is generally not more than 4 m.
Referring to fig. 1, the steep-dip excavation body 3 of the bedding slope is firstly reinforced by the prestressed anchor rods 1 and then excavated, and the rock mass of the inner side slope is always in an active stress state, so that the stability of the side slope in the excavation process and after excavation and reinforcement is effectively improved.
Referring to fig. 7, the prestressed anchor rod 1 is composed of an inner end bonding section 11a, an outer end bonding section 11b and a middle free section 12, reinforcing steel bars of the inner end bonding section 11a and the outer end bonding section 11b are directly contacted with mortar, and the middle free section 12 is coated with anti-corrosion oil and is protected by a sleeve in a sealing manner; when the prestressed anchor rod 1 is constructed, the inner end bonding section 11a is subjected to pressure grouting, and after the strength of the mortar on the inner side reaches 80% of the designed strength, the middle free section 12 and the outer end bonding section 11b on the outer side are subjected to pressure grouting and mortar solidification in a tensioning state. Because the prestressed anchor rod 1 is provided with the inner end bonding section 11a, the outer end bonding section 11b and the middle free section 12 for applying prestress, the bedding slope rock body is always in a favorable stress state, and the influence of the steep dip excavation body 3 construction, the delayed stress of the frame beam 2 and the general blasting excavation on the outer side on the stability of the slope after the steep dip excavation is small.
The foregoing is illustrative only of the principles of the method of the invention for steep incline down a bedding slope and for the construction of anchor reinforced structures, and is not intended to limit the invention to the application illustrated and described, so that all modifications and equivalents that may be resorted to are intended to fall within the scope of the invention.
Claims (3)
1. A construction method for steep-dip excavation of bedding slope and anchor rod reinforcing structure comprises the following steps:
determining slope elevation and plane positions of a slope crest line of steep-dip excavation of a bedding side slope, an excavated temporary small step, a side slope middle platform and a side slope excavation contour line (C);
constructing a prestressed anchor rod (1) on the slope surface with the excavation thickness less than 3m above and below the excavation slope crest line;
thirdly, constructing and excavating the frame beam (2) reinforced concrete at the outer end of the prestressed anchor rod (1) above the top slope line, and fixedly connecting the reinforcing steel bars of the frame beam (2) with the outer end of the prestressed anchor rod (1);
fourthly, excavating the steep-dip excavation body (3) reinforced by the prestressed anchor rod (1) to the position of an excavation contour line (C);
cutting off the outer end of the overlong prestressed anchor rod (1), constructing a frame beam (2) reinforced concrete at the outer end of the prestressed anchor rod (1), and fixedly connecting the reinforcing steel bars of the frame beam (2) with the outer end of the prestressed anchor rod (1);
excavating a bedding excavation body (4) which can be constructed bedding below the slope surface in a grading way until the inner side has no bedding excavation condition;
seventhly, constructing a prestressed anchor rod (1) in the steep excavation body (3) at the inner side of the grading section;
eighthly, excavating a steep-dip excavating body (3) reinforced by the prestress anchor rods (1) of the grading section to the position of the excavating contour line of the grading section;
ninthly, cutting off the overlong outer end of the prestressed anchor rod (1), constructing a frame beam (2) reinforced concrete at the outer end of the prestressed anchor rod (1), and fixedly connecting a reinforcing steel bar of the frame beam (2) with the outer end of the prestressed anchor rod (1);
and c, repeating the step c to the step n until the construction of the prestressed anchor rods (1) and the frame beams (2) of all the graded section side slopes is completed.
2. The method for constructing the steep-dip excavation and anchor rod reinforcing structure of the bedding slope as claimed in claim 1, wherein the method comprises the following steps: the prestressed anchor rod (1) is composed of an inner end bonding section (11a), an outer end bonding section (11b) and a middle free section (12), steel bars of the inner end bonding section (11a) and the outer end bonding section (11b) are directly contacted with mortar, and the middle free section (12) is coated with anti-corrosion oil and is protected in a sealing mode by a sleeve; when the prestressed anchor rod (1) is constructed, the inner end bonding section (11a) is subjected to pressure grouting, and after the strength of mortar on the inner side reaches 80% of the designed strength, the middle free section (12) and the outer end bonding section (11b) on the outer side are subjected to pressure grouting and mortar solidification in a tension state.
3. The method for constructing the steep-dip excavation and anchor rod reinforcing structure of the bedding slope as claimed in claim 1, wherein the method comprises the following steps: the construction height of the grading section is not more than 4 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911385500.0A CN111139841B (en) | 2019-12-29 | 2019-12-29 | Construction method for bedding slope steep dip excavation and anchor rod reinforcing structure |
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| CN201911385500.0A CN111139841B (en) | 2019-12-29 | 2019-12-29 | Construction method for bedding slope steep dip excavation and anchor rod reinforcing structure |
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| CN111139841A CN111139841A (en) | 2020-05-12 |
| CN111139841B true CN111139841B (en) | 2021-03-23 |
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| CN113737789B (en) * | 2021-11-03 | 2022-02-18 | 成都理工大学 | Self-drilling type reinforcing system and self-drilling type reinforcing method for soft soil layer |
| CN114809031A (en) * | 2022-03-23 | 2022-07-29 | 中国水利水电第九工程局有限公司 | Construction method for plate-rib type anchor rod retaining wall support slope |
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| CN102002956B (en) * | 2010-12-07 | 2012-06-27 | 武汉大学 | Multi-level fully-closed reinforcement technology of exposed fault zone of excavated side slope |
| JP2018091036A (en) * | 2016-12-02 | 2018-06-14 | フリー工業株式会社 | Slope stabilization method |
| CN207405635U (en) * | 2017-06-05 | 2018-05-25 | 吴震 | Friction pile adds the antiskid structure that row's antiskid anchor pole administers bedding plane landslide |
| CN109487804B (en) * | 2018-12-06 | 2024-05-28 | 中铁二院工程集团有限责任公司 | Low-disturbance reinforcement protection system for red-layer soft rock cutting slope and construction method |
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