CN111997008A - Construction method for underwater non-blasting demolition of reserved rock ridge - Google Patents
Construction method for underwater non-blasting demolition of reserved rock ridge Download PDFInfo
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- CN111997008A CN111997008A CN202010836680.6A CN202010836680A CN111997008A CN 111997008 A CN111997008 A CN 111997008A CN 202010836680 A CN202010836680 A CN 202010836680A CN 111997008 A CN111997008 A CN 111997008A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/04—Free-flow canals or flumes; Intakes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of tunnel construction of hydraulic and hydroelectric engineering, in particular to an underwater non-blasting demolition construction method for a reserved rock ridge. Step 1, after the tunnel construction is finished, closing a tunnel inlet gate, and carrying out filling and horizontal compression on a tunnel inlet vertical shaft; step 2, selecting a matched long-arm excavator according to the construction water depth, and assembling a milling and digging head at the end part of a movable arm of the long-arm excavator; step 3, building an overwater construction platform for bearing the long-arm excavator on the water surface according to the weight of the long-arm excavator; step 4, driving the long-arm excavator into the overwater construction platform, and controlling the milling and excavating head to remove the rock ridge at the excavated part; and 5, after the rock ridge is completely removed, replacing the milling and digging head into a grab bucket, and grabbing slag materials to match with a barge to remove slag. The construction method has the advantages that the construction platform on water is built to be matched with the milling and digging head and the grab bucket to remove the reserved rock ridge, compared with an underwater rock ridge or rock plug blasting construction method, construction disturbance is small, requirements on tunnel entrance geological conditions are low, and adaptability is high.
Description
Technical Field
The invention relates to the technical field of tunnel construction of hydraulic and hydroelectric engineering, in particular to an underwater non-blasting demolition construction method for a reserved rock ridge.
Background
Most of our country earth and rockfill dams are newly built in the 50-70 th century, the common type of water diversion buildings is a culvert pipe under the dam, and potential safety hazards often appear in the culvert pipe under the dam, so that seepage and structural safety of the earth and rockfill dam can be threatened in serious cases. Therefore, in the design of danger removal and reinforcement of the earth and rockfill dam, the culvert pipe under the dam is often plugged, and a diversion tunnel is newly built. Because the reinforcement engineering reservoir is in operation, the reservoir can not be emptied or the water level can not be reduced below the inlet elevation of the newly-built diversion tunnel during construction, and therefore, the underwater construction problem of the tunnel inlet is faced during construction of the newly-built diversion tunnel.
When the water depth is not large and the topography of the tunnel entrance is flat and gentle, the cofferdam can be filled to form dry land construction conditions, but when the water depth is deep and the topography of the tunnel entrance is steep, the cofferdam is large in scale and difficult to dismantle. At present, the construction methods commonly adopted for the underwater construction of the tunnel entrance comprise a reserved rock ridge blasting method and a rock plug blasting method. The shortcoming of reserved inlet rock ridge or rock plug blasting demolition is as follows:
(1) blasting must be successful once to form an imported body type, otherwise secondary blasting construction is difficult;
(2) blasting vibration has great influence on surrounding buildings;
(3) rock plug or rock bank blasting has high requirements on the quality of rock mass, and is suitable for geological conditions with good quality of rock mass and shallow covering layer;
(4) when the tunnel is communicated, blasting slag easily enters the tunnel along with water flow, the lining concrete of the tunnel is abraded, and a gate slot embedded part is damaged.
Disclosure of Invention
The invention aims to provide a construction method for underwater non-blasting demolition of a reserved rock ridge, which has low requirement on the quality of rock mass and is suitable for the conditions of steep terrain and poor geological conditions of a tunnel entrance.
The technical scheme of the invention is that the method comprises the following steps:
step 1, after the tunnel construction is finished, closing a tunnel inlet gate, and carrying out filling and horizontal compression on a tunnel inlet vertical shaft;
step 2, selecting a matched long-arm excavator according to the construction water depth, and assembling a milling and digging head at the end part of a movable arm of the long-arm excavator;
step 3, building an overwater construction platform for bearing the long-arm excavator on the water surface according to the weight of the long-arm excavator;
step 4, driving the long-arm excavator into the overwater construction platform, and controlling the milling and excavating head to remove the rock ridge at the excavated part;
and 5, after the rock ridge is completely removed, replacing the milling and digging head into a grab bucket, and grabbing slag materials to match with a barge to remove slag.
Preferably, the milling and digging head is provided with a GPS system, and the GPS system transmits the positioning information of the milling and digging head to a cab display screen in real time.
Preferably, the residual slag materials of the excavation part which can not be cleaned by the grab bucket are cleaned by a diver by adopting a negative pressure device.
Preferably, the above-water construction platform is constructed by a steel truss and a buoy.
Preferably, before the step 1, the method further comprises:
step a, excavating a vertical shaft at a tunnel inlet to form a reserved rock ridge (5);
b, performing consolidation grouting on the reserved rock ridge (5);
and c, reserving a rock ridge (5) for retaining water, and constructing a tunnel inlet.
Preferably, in the step b, the geological conditions of the surrounding rocks are judged, and when the surrounding rocks belong to IV-type surrounding rocks, V-type surrounding rocks or surrounding rocks with strong water permeability, the reserved rock ridge (5) is subjected to consolidation grouting treatment.
The invention has the beneficial effects that: the construction platform on water is built to be matched with the milling and digging head and the grab bucket to remove the reserved rock ridge, compared with a blasting construction method, the construction disturbance is small, the requirement on the geological condition of the tunnel entrance is low, the adaptability is strong, and meanwhile, the rock ballast can be reduced from entering the tunnel, wearing the tunnel lining concrete and damaging the gate slot embedded part. Compared with manual cleaning, the danger of falling blocks, collapse and the like which can be met when people excavate the tunnel face is avoided, and the safety of tunnel construction can be greatly improved. Compared with the dry land construction of filling cofferdams, the method has good adaptation to the water depth and the topography of a tunnel entrance and small dismantling amount. The GPS system is arranged on the milling and digging head, so that accurate positioning of digging is realized, the controllability of the body type of the water inlet is good, and over digging and under digging are prevented.
Drawings
FIG. 1 is a schematic construction flow diagram of an underwater non-blasting demolition construction method for a reserved rock ridge;
FIG. 2 is a schematic view of a construction state of the rock sill removed by the milling and excavating head according to the present invention;
FIG. 3 is a schematic view of the construction state of the invention using a grab bucket to remove slag.
In the figure: 1. the method comprises the following steps of (1) constructing a platform on water, 2-a long-arm excavator, 3-a milling and digging head, 4-ballast, 5-a rock ridge, 6-a trash rack and 7-a vertical shaft.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1-3, a construction method for underwater non-blasting demolition of a reserved sill comprises the following steps:
step 1, after the tunnel construction is finished, closing a tunnel inlet gate, and carrying out filling and horizontal compression on a tunnel inlet vertical shaft;
step 2, selecting a long-arm excavator 2 which is adaptive according to the construction water depth, and assembling a milling and digging head 3 at the end part of a movable arm of the long-arm excavator 2;
step 3, building an overwater construction platform 1 for bearing the long-arm excavator 2 on the water surface according to the weight of the long-arm excavator 2;
step 4, driving the long-arm excavator 2 into the overwater construction platform 1, and controlling the milling and digging head 3 to remove the rock ridge 5 at the digging part;
and 5, after the rock ridge 5 is completely removed, replacing the milling and digging head 3 with a grab bucket 8, and grabbing slag materials to match with a barge to remove slag.
Preferably, the milling and digging head 3 is provided with a GPS system, and the GPS system transmits the positioning information of the milling and digging head 3 to a cab display screen in real time.
Preferably, the residual slag materials which are 0.2m high at the bottom of the excavation part and cannot be cleaned by the grab bucket 8 are cleaned by a diver by using a negative pressure device.
Preferably, the above-water construction platform 1 is constructed by a steel truss and a buoy.
Before the tunnel is constructed, the method also comprises the following steps:
step a: excavating construction from a tunnel outlet, excavating a vertical shaft at a tunnel inlet to form a reserved rock bank, and considering the safety superelevation of the rock bank top according to the design specification of the cofferdam of the hydraulic and hydroelectric engineering;
step b: for IV-type and V-type surrounding rocks with poor geological conditions or surrounding rocks with strong water permeability, consolidation grouting needs to be carried out on rock ridges;
step c: reserving a rock ridge for retaining water, and carrying out tunnel lining construction, import trash rack installation construction and other metal structures under the protection of the rock ridge.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (6)
1. The underwater non-blasting demolition construction method for the reserved rock ridge is characterized by comprising the following steps of:
step 1, after the tunnel construction is finished, closing a tunnel inlet gate, and carrying out filling and horizontal compression on a tunnel inlet vertical shaft;
step 2, selecting a long-arm excavator (2) which is adaptive according to the construction water depth, and assembling a milling and digging head (3) at the end part of a movable arm of the long-arm excavator (2);
step 3, building an overwater construction platform (1) for bearing the long-arm excavator (2) on the water surface according to the weight of the long-arm excavator (2);
step 4, the long-arm excavator (2) drives into the overwater construction platform (1), the overwater construction platform (1) is positioned to a construction water area, and the milling and excavating head (3) is controlled to remove the rock ridge (5) at the excavation position;
and 5, after the rock ridge (5) is completely removed, replacing the milling and digging head (3) with a grab bucket (8), and grabbing slag materials to match with a barge to remove slag.
2. The underwater non-blasting demolition construction method for the reserved sill according to claim 1, characterized in that: the milling and digging head (3) is provided with a GPS system, and the GPS system transmits the positioning information of the milling and digging head (3) to a cab display screen in real time.
3. The underwater non-blasting demolition construction method for the reserved sill according to claim 1, characterized in that: and residual slag materials at the excavation part which cannot be cleaned by the grab bucket (8) are cleaned by a diver by adopting a negative pressure device.
4. The underwater non-blasting demolition construction method for the reserved sill according to claim 1, characterized in that: the overwater construction platform (1) is constructed by a steel truss and a buoy.
5. The underwater non-blasting demolition construction method for the reserved sill according to claim 1, characterized in that: before step 1, the method further comprises:
step a, excavating a vertical shaft at a tunnel inlet to form a reserved rock ridge (5);
b, performing consolidation grouting on the reserved rock ridge (5);
and c, reserving a rock ridge (5) for retaining water, and constructing a tunnel inlet.
6. The underwater non-blasting demolition construction method for the reserved sill according to claim 5, characterized in that: and in the step b, the geological conditions of the surrounding rocks are judged, and when the surrounding rocks belong to IV-type surrounding rocks or V-type surrounding rocks or surrounding rocks with strong water permeability, consolidation grouting treatment is carried out on the reserved rock ridge (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010836680.6A CN111997008A (en) | 2020-08-19 | 2020-08-19 | Construction method for underwater non-blasting demolition of reserved rock ridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010836680.6A CN111997008A (en) | 2020-08-19 | 2020-08-19 | Construction method for underwater non-blasting demolition of reserved rock ridge |
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| Publication Number | Publication Date |
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| CN111997008A true CN111997008A (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010836680.6A Pending CN111997008A (en) | 2020-08-19 | 2020-08-19 | Construction method for underwater non-blasting demolition of reserved rock ridge |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349064A (en) * | 2008-08-26 | 2009-01-21 | 中国水利水电第五工程局 | Construction method of hydroelectric power station surge chamber vertical shaft under soft rock geological condition |
| RU2467198C1 (en) * | 2011-07-28 | 2012-11-20 | Евгений Юрьевич Бондарев | Hydroelectric power plant |
| CN104389609A (en) * | 2014-09-24 | 2015-03-04 | 中国水利水电第十四工程局有限公司 | No-blasting mechanical digging method |
| CN110306928A (en) * | 2019-08-01 | 2019-10-08 | 重庆渝交机电设备有限公司 | A kind of multifunctional drill and the non-blasting construction method of hard rock tunnel |
-
2020
- 2020-08-19 CN CN202010836680.6A patent/CN111997008A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349064A (en) * | 2008-08-26 | 2009-01-21 | 中国水利水电第五工程局 | Construction method of hydroelectric power station surge chamber vertical shaft under soft rock geological condition |
| RU2467198C1 (en) * | 2011-07-28 | 2012-11-20 | Евгений Юрьевич Бондарев | Hydroelectric power plant |
| CN104389609A (en) * | 2014-09-24 | 2015-03-04 | 中国水利水电第十四工程局有限公司 | No-blasting mechanical digging method |
| CN110306928A (en) * | 2019-08-01 | 2019-10-08 | 重庆渝交机电设备有限公司 | A kind of multifunctional drill and the non-blasting construction method of hard rock tunnel |
Non-Patent Citations (2)
| Title |
|---|
| 夏晓勇等: "公路工程非爆破开挖方法及适用条件研究", 《科技视界》 * |
| 孙云峰等: "某引水工程取水口围堰和预留岩坎拆除爆破", 《工程爆破》 * |
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Application publication date: 20201127 |
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