CN112647507A - Bidirectional slurry supply hole internal circulation type contact grouting system and use method thereof - Google Patents
Bidirectional slurry supply hole internal circulation type contact grouting system and use method thereof Download PDFInfo
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- CN112647507A CN112647507A CN202011505456.5A CN202011505456A CN112647507A CN 112647507 A CN112647507 A CN 112647507A CN 202011505456 A CN202011505456 A CN 202011505456A CN 112647507 A CN112647507 A CN 112647507A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention discloses a bidirectional slurry supply hole internal circulation type contact grouting system, and relates to the field of foundation treatment of hydraulic and hydroelectric engineering. It comprises a main pulp inlet pipe and a main pulp return pipe; the horizontal pulp inlet pipe is provided with pulp outlet boxes at intervals; the horizontal pulp inlet pipe is connected with the horizontal pulp return pipe through a pulp outlet box; the horizontal slurry inlet pipe is led out from the slurry inlet main pipe in the elevation direction; the invention can feed slurry from the upstream and downstream sides, thereby greatly improving the grouting guarantee rate; the contact grouting system is integrally in a parallel network shape, can effectively ensure that a grouting pipeline can still normally run under the condition of local blockage, and greatly improves the grouting guarantee rate. The invention also relates to a using method of the bidirectional slurry supply hole internal circulation type contact grouting system.
Description
Technical Field
The invention relates to the field of foundation treatment of hydraulic and hydroelectric engineering, in particular to a bidirectional slurry supply hole internal circulation type contact grouting system. The invention also relates to a using method of the bidirectional slurry supply hole internal circulation type contact grouting system.
Background
Concrete gravity dam, arch dam bank slope dam section are usually steeper, because concrete cooling shrinkage makes bank slope dam section and basement rock face have the gap after pouring, and the faying surface between the two is not closely knit, influences dam and basement rock combined force, need carry out contact grouting and handle.
The contact grouting comprises three methods, namely a drilling and pipe-embedding grouting method, an embedded pipe grouting method and a direct drilling and grouting method; pre-burying a contact grouting system on the bed rock surface of the bank slope dam section by a pre-buried pipe grouting method, and performing contact grouting construction after concrete pouring is finished; the pre-buried pipe grouting method can avoid the interference with concrete pouring in the later period, is usually adopted in engineering, but the prior contact grouting system adopts one-way slurry supply and pure pressure type grouting, and the grouting method has the following problems at present:
1) the grouting guarantee rate of unidirectional slurry supply is low, and the whole non-uniform grouting is easily caused
In the unidirectional slurry supply mode, the grouting pipeline has only one loop; when a certain section of the grouting pipeline is blocked, the flow of the grout is blocked, and the grout cannot be poured into a contact surface behind the blocked section, so that the grouting guarantee rate is low; if the plugging section is near the main grouting pipe, the failure of the whole contact grouting system can be caused. Because the contact grouting system is pre-buried, the difficulty of dredging after the grouting pipeline is blocked is high, and the grouting quality is directly influenced;
under the one-way thick liquid mode of supplying, meet the local area that the contact surface is vacated greatly, the thick liquid volume of inhaling greatly among the filling process, the thick liquid will concentrate on local area through the dominant passageway and pour into, and other areas lead to the grout effect relatively poor because of supplying thick liquid not enough, finally lead to whole inhomogeneous to be irritated, the quality is relatively poor.
2) The pure-pressure grouting slurry has slow flowing, easy precipitation and possibility of blocking a grouting pipeline, and the grouting effect is not as good as that of circulating grouting;
grouting is divided into pure pressure type and circulation type; the pure pressure type grouting drill hole is only provided with a slurry inlet pipe and is not provided with a slurry return pipe, the pipeline is simple, the operation is convenient, but the flow of the grouting slurry is slow, the grouting slurry is easy to precipitate, and the grouting pipeline in the hole can be blocked; the circulating grouting drill hole is internally provided with the slurry inlet pipe and the slurry return pipe, so that slurry can keep a flowing state in the hole section, the slurry can be effectively prevented from precipitating, and the grouting effect is good; at present, circulating grouting is mainly used for consolidation grouting and curtain grouting, and contact grouting is rarely adopted.
Therefore, it is necessary to develop a bidirectional slurry feeding hole internal circulation type contact grouting system.
Disclosure of Invention
The first purpose of the present invention is to overcome the above disadvantages of the background art, and to provide a bidirectional slurry feeding hole internal circulation type contact grouting system.
The second purpose of the invention is to provide a using method of the bidirectional slurry supply hole internal circulation type contact grouting system.
In order to achieve the first object, the technical scheme of the invention is as follows: the utility model provides a two-way confession thick liquid downthehole circulation formula contact grouting system which characterized in that: the device comprises two slurry inlet main pipes, two slurry return main pipes and a slurry outlet main pipe, wherein the two slurry inlet main pipes are positioned on the upstream and downstream sides of a bank slope dam section, the inlets of the two slurry inlet main pipes are arranged at a low elevation, and the two slurry return main pipes are positioned in the middle of the bank slope dam section, and the outlets of the two slurry return main pipes are arranged at a;
a plurality of horizontal pulp inlet pipes are arranged between the two pulp inlet main pipes in parallel at intervals in the elevation direction, and a plurality of pulp outlet boxes are arranged on the horizontal pulp inlet pipes at intervals;
the horizontal slurry return pipes are arranged in parallel at intervals in the elevation direction of the slurry return main pipe;
the horizontal pulp inlet pipe is connected with the horizontal pulp return pipe through a pulp outlet box;
the inner diameter of the main slurry inlet pipe is 40mm, horizontal slurry inlet pipes are led out of the main slurry inlet pipe every 2m in the elevation direction, and the inner diameter of each horizontal slurry inlet pipe is 40 mm;
the inner diameter of the main pulp return pipe is 40 mm; the horizontal slurry return pipe and the horizontal slurry inlet pipe are arranged in parallel, and the distance between the horizontal slurry return pipe and the horizontal slurry inlet pipe is 10cm-20 cm;
the distance between the pulp outlet boxes is 2.5 m;
the grout outlet box comprises a grout inlet branch pipe, one end of the grout inlet branch pipe extends into the bottom of the grout hole, the other end of the grout inlet branch pipe is connected with the horizontal grout inlet pipe, and one end of the grout outlet branch pipe extends into the orifice of the grout hole, and the other end of the grout outlet branch pipe is connected with the horizontal grout return pipe.
In the technical scheme, the horizontal slurry inlet pipe is connected with the slurry inlet branch pipe through a three-way pipe; the horizontal slurry return pipe is connected with the slurry return branch pipe through a three-way pipe.
In the technical scheme, the parts of the slurry inlet branch pipes extending into the grouting holes are spaced to form holes.
In the technical scheme, the aperture of the grouting hole is 76mm, and the depth of the grouting hole is 50-100 cm.
In the technical scheme, the slurry inlet branch pipe extends into the grouting hole and is 10cm away from the bottom of the grouting hole; and the slurry return branch pipe extends into the position 5cm below the orifice of the grouting hole.
In the technical scheme, the slurry inlet branch pipe and the slurry return branch pipe penetrate through the steel plate and are welded with the steel plate, and the steel plate is positioned at the orifice of the grouting hole.
In order to achieve the second object, the invention has the technical scheme that: the use method of the bidirectional slurry supply hole internal circulation type contact grouting system is characterized by comprising the following steps of:
step 1: drilling grouting holes, wherein the grouting holes are vertical to the slope surface, a row of drilling holes are arranged at intervals of 2m in the elevation direction, and the pitch between the rows of grouting holes is 2.5 m; after drilling is finished, flushing out rock powder and other substances in the hole by adopting high-flow water flow until backwater is clarified;
step 2: installing a contact grouting pipeline, and installing a slurry inlet branch pipe and a slurry return branch pipe in a grouting hole; the slurry inlet branch pipe extends into the bottom of the grouting hole and is 10cm away from the bottom of the hole; the slurry return branch pipe extends into the position 5cm below the orifice of the grouting hole; the slurry inlet branch pipe and the slurry return branch pipe penetrate through the steel plate and are welded with the steel plate; the steel plate is positioned at the orifice of the grouting hole, and the periphery of the steel plate is caulked by mortar;
and step 3: arranging a main slurry inlet pipe on both the upstream side and the downstream side of the bank slope dam section, arranging an inlet of the main slurry inlet pipe at a low elevation, and leading the inlet of the main slurry inlet pipe to a downstream dam face; leading out horizontal slurry inlet pipes every 2m in the elevation direction from the slurry inlet main pipe, pre-burying slurry outlet boxes every 2.5m on the horizontal slurry inlet pipes, connecting the horizontal slurry inlet pipes with slurry inlet branch pipes through three-way pipes, and leading slurry into grouting holes; the inner diameters of the main slurry inlet pipe and the horizontal slurry inlet pipe are both 40mm, and the inner diameter of the slurry inlet branch pipe is 32 mm;
the horizontal slurry return pipe and the horizontal slurry inlet pipe are arranged in parallel at a distance of 10-20 cm, so that the influence on dense concrete pouring of the dam is avoided; the horizontal slurry return pipe is connected with the slurry return branch pipe through a three-way pipe, and slurry is led out from the grouting hole; the two main slurry return pipes are arranged in the middle of the bank slope dam section and respectively form a loop with the main slurry inlet pipes on the upstream side and the downstream side, slurry in the horizontal slurry return pipes on the high level on the upstream side and the downstream side is collected, the outlets of the main slurry return pipes are arranged at the high level, and the outlets of the main slurry return pipes are led to the downstream dam surface;
and 4, step 4: checking before grouting, wherein the opening degree of the seam face is required to be checked before contacting with grouting, and the opening degree of the seam face is not less than 0.5 mm. And carrying out water passing inspection on the pre-buried contact grouting pipeline, wherein the water passing pressure is 80% of the designed grouting pressure, and inspecting whether the grouting pipeline is smooth or not;
and 5: when the opening degree of the joint face meets the standard requirement and the grouting pipeline is unblocked, the contact grouting of the bank slope dam section can be carried out, two grouting pumps are arranged on the downstream dam face for contact grouting, a pressure gauge is installed on the main grouting pipe, and the grouting pressure is monitored;
step 6: and arranging an inspection hole after grouting, and analyzing the contact grouting effect by using the drilling coring and pressurized water data of the inspection hole after grouting.
Compared with the prior art, the invention has the following advantages:
1) the invention can feed slurry from the upstream and downstream sides, thereby greatly improving the grouting guarantee rate; the contact grouting system is integrally in a parallel network shape, can effectively ensure that a grouting pipeline can still normally run under the condition of local blockage, and greatly improves the grouting guarantee rate.
2) The arrangement mode of the grout inlet main pipe and the grout return main pipe can ensure that the whole grouting area can be effectively and uniformly grouted, no grouting leakage area exists, the integral stress characteristic between dam body concrete and bank slope bedrock is effectively ensured, and the dam shoulder leakage amount is greatly reduced.
3) The invention obviously improves the fluidity of the slurry, the slurry is not easy to precipitate, and the grouting effect is good; the invention adopts the in-hole circulation type filling, although the in-hole circulation type filling increases the length of the pipeline, the liquidity of the slurry is obviously improved, the slurry is not easy to precipitate, the original water in the drill hole can be well replaced, the grouting effect is good, the dam body concrete and the bank slope bedrock can be ensured not to be separated after the contact grouting, and the contact surface is tightly filled.
Drawings
FIG. 1 is a schematic plan view of the present invention.
FIG. 2 is a schematic side view of the present invention.
Fig. 3 is a schematic structural view of the pulp outlet box.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.
With reference to the accompanying drawings: the utility model provides a two-way confession thick liquid downthehole circulation formula contact grouting system which characterized in that: the device comprises two main slurry inlet pipes 1 which are positioned at the upstream and downstream sides of a bank slope dam section and have inlets arranged at a low elevation, and two main slurry return pipes 2 which are positioned at the middle part of the bank slope dam section and have outlets arranged at a high elevation;
a plurality of horizontal pulp inlet pipes 11 are arranged between the two pulp inlet main pipes 1 in parallel at intervals in the elevation direction, and a plurality of pulp outlet boxes 3 are arranged on the horizontal pulp inlet pipes 11 at intervals;
a plurality of horizontal slurry return pipes 21 which are arranged in parallel at intervals in the elevation direction of the slurry return main pipe 2;
the horizontal pulp inlet pipe 11 and the horizontal pulp return pipe 21 are connected through the pulp outlet box 3;
the inner diameter of the main pulp inlet pipe 1 is 40mm, horizontal pulp inlet pipes 11 are led out of the main pulp inlet pipe 1 every 2m in the elevation direction, and the inner diameter of each horizontal pulp inlet pipe 11 is 40 mm;
the inner diameter of the main pulp return pipe 2 is 40 mm; the horizontal slurry return pipe 21 and the horizontal slurry inlet pipe 11 are arranged in parallel at a distance of 10-20 cm;
the distance between the pulp outlet boxes 3 is 2.5 m.
The grout outlet box 3 comprises a grout inlet branch pipe 31 with one end extending into the bottom of the grout hole 4 and the other end connected with the horizontal grout inlet pipe 11, and a grout return branch pipe 32 with one end extending into the orifice of the grout hole 4 and the other end connected with the horizontal grout return pipe 21.
The horizontal slurry inlet pipe 11 is connected with the slurry inlet branch pipe 31 through a three-way pipe 5; the horizontal slurry return pipe 21 is connected with the slurry return branch pipe 32 through a three-way pipe 5.
In order to prevent the bottom of the grouting hole 4 from clogging and blocking the outlet of the slurry inlet branch pipe 31 and ensure normal slurry outlet, the part of the slurry inlet branch pipe 31 extending into the grouting hole 4 is provided with holes 311 at intervals, the distance between every two holes is 30-40 cm, and the aperture of each hole 311 is 10 mm.
The diameter of the grouting hole 4 is 76mm, and the depth of the grouting hole is 50-100 cm.
The slurry inlet branch pipe 31 extends into the grouting hole 4 and is 10cm away from the bottom of the grouting hole 4; the slurry return branch pipe 32 extends into the position 5cm below the orifice of the grouting hole 4.
The slurry inlet branch pipe 31 and the slurry return branch pipe 32 both penetrate through the steel plate 6 and are welded with the steel plate 6, and the steel plate 6 is positioned at the orifice of the grouting hole 4.
The use method of the bidirectional slurry supply hole internal circulation type contact grouting system is characterized by comprising the following steps of:
step 1: drilling grouting holes 4, wherein the grouting holes 4 are vertical to the slope surface, a row of drilling holes are arranged at intervals of 2m in the elevation direction, and the pitch between the rows of grouting holes 4 is 2.5 m; after drilling is finished, flushing out rock powder and other substances in the hole by adopting high-flow water flow until backwater is clarified;
step 2: installing a contact grouting pipeline, and installing a slurry inlet branch pipe 31 and a slurry return branch pipe 32 in the grouting hole 4; the slurry inlet branch pipe 31 extends into the bottom of the grouting hole 4 and is 10cm away from the bottom of the hole; the slurry return branch pipe 32 extends into the position 5cm below the orifice of the grouting hole 4; the slurry inlet branch pipe 31 and the slurry return branch pipe 32 both penetrate through the steel plate 6 and are welded with the steel plate 6; the steel plate 6 is positioned at the orifice of the grouting hole 4, and the periphery of the steel plate is caulked by mortar;
and step 3: the slurry inlet main pipes 1 are uniformly arranged on the two sides of the upstream and downstream of the bank slope dam section, the inlets of the slurry inlet main pipes 1 are arranged at low elevations, and the inlets of the slurry inlet main pipes 1 are led to the downstream dam surface; leading out horizontal slurry inlet pipes 11 at intervals of 2m in the elevation direction from the slurry inlet main pipe 1, pre-burying slurry outlet boxes 3 at intervals of 2.5m on the horizontal slurry inlet pipes 11, connecting the horizontal slurry inlet pipes 11 with the slurry inlet branch pipes 31 through three-way pipes 5, and leading slurry into the grouting holes 4; the inner diameters of the main slurry inlet pipe 1 and the horizontal slurry inlet pipe 11 are both 40mm, and the inner diameter of the slurry inlet branch pipe 31 is 32 mm;
the horizontal slurry return pipe 21 and the horizontal slurry inlet pipe 11 are arranged in parallel at a distance of 10-20 cm, so that the influence on dense concrete pouring of the dam is avoided; the horizontal slurry return pipe 21 is connected with the slurry return branch pipe 32 through a three-way pipe 5, and slurry is led out from the grouting hole 4; the two main slurry return pipes 2 are arranged in the middle of the bank slope dam section and respectively form a loop with the main slurry inlet pipes 1 on the upstream side and the downstream side, slurry in the horizontal slurry return pipes 21 on the upstream side and the downstream side in each height range is collected, the outlets of the main slurry return pipes 2 are arranged at the high height range, and the outlets of the main slurry return pipes 2 are led to the downstream dam surface;
and 4, step 4: checking before grouting, wherein the opening degree of the seam face is required to be checked before contacting with grouting, and the opening degree of the seam face is not less than 0.5 mm. And carrying out water passing inspection on the pre-buried contact grouting pipeline, wherein the water passing pressure is 80% of the designed grouting pressure, and inspecting whether the grouting pipeline is smooth or not; dredging the grouting pipeline when necessary;
and 5: when the opening of the joint face meets the standard requirement and the grouting pipeline is unblocked, the contact grouting of the bank slope dam section can be carried out, two grouting pumps are arranged on the downstream dam face for contact grouting, a pressure gauge is installed on the main grouting pipe 2, and the grouting pressure is monitored;
step 6: and arranging an inspection hole after grouting, and analyzing the contact grouting effect by using the drilling coring and pressurized water data of the inspection hole after grouting.
In practical use, the invention better solves the problems of low guarantee rate of the prior contact grouting and uneven overall grouting, and simultaneously solves the problems of slow flowing of the grout and easy sedimentation of the grout.
Rubber grout stopping belts 71 are arranged on two sides of the bank slope dam section and on the upstream and downstream, grout stopping ridges 72 are arranged on two sides of the bank slope dam section and on the upstream and downstream, and an exhaust grout returning groove 73 is arranged below the upstream grout stopping ridges 72; two ends of the exhaust slurry return groove 73 are connected with the downstream dam surface through an exhaust slurry return pipe 74.
Other parts not described belong to the prior art.
Claims (7)
1. The utility model provides a two-way confession thick liquid downthehole circulation formula contact grouting system which characterized in that: the device comprises two slurry inlet main pipes (1) which are positioned at the upper and lower sides of the upstream and downstream of a bank slope dam section, the inlets of which are arranged at a low elevation, and two slurry return main pipes (2) which are positioned at the middle part of the bank slope dam section, the outlets of which are arranged at a high elevation;
a plurality of horizontal pulp inlet pipes (11) are arranged between the two pulp inlet main pipes (1) in parallel at intervals in the elevation direction, and a plurality of pulp outlet boxes (3) are arranged on the horizontal pulp inlet pipes (11) at intervals;
a plurality of horizontal slurry return pipes (21) are arranged in parallel at intervals in the elevation direction of the slurry return main pipe (2);
the horizontal pulp inlet pipe (11) is connected with the horizontal pulp return pipe (21) through the pulp outlet box (3);
the inner diameter of the main pulp inlet pipe (1) is 40mm, horizontal pulp inlet pipes (11) are led out of the main pulp inlet pipe (1) every 2m in the elevation direction, and the inner diameter of each horizontal pulp inlet pipe (11) is 40 mm;
the inner diameter of the main pulp return pipe (2) is 40 mm; the horizontal slurry return pipe (21) and the horizontal slurry inlet pipe (11) are arranged in parallel at a distance of 10-20 cm;
the distance between the pulp outlet boxes (3) is 2.5 m;
the grout outlet box (3) comprises a grout inlet branch pipe (31) with one end extending into the bottom of the grout hole (4) and the other end connected with the horizontal grout inlet pipe (11), and a grout return branch pipe (32) with one end extending into the orifice of the grout hole (4) and the other end connected with the horizontal grout return pipe (21).
2. The internal circulation type contact grouting system of a bidirectional grout supply hole according to claim 1, characterized in that: the horizontal slurry inlet pipe (11) is connected with the slurry inlet branch pipe (31) through a three-way pipe (5); the horizontal slurry return pipe (21) is connected with the slurry return branch pipe (32) through a three-way pipe (5).
3. The internal circulation type contact grouting system of the bidirectional grout supply hole as claimed in claim 2, wherein: the part of the slurry inlet branch pipe (31) extending into the grouting hole (4) is provided with holes (311) at intervals.
4. The internal circulation type contact grouting system of the bidirectional grout supply hole according to claim 3, wherein: the diameter of the grouting hole (4) is 76mm, and the depth of the grouting hole is 50-100 cm.
5. The internal circulation type contact grouting system of the bidirectional grout supply hole as claimed in claim 4, wherein: the slurry inlet branch pipe (31) extends into the grouting hole (4) and is 10cm away from the bottom of the grouting hole (4); and the slurry return branch pipe (32) extends into the position 5cm below the orifice of the grouting hole (4).
6. The internal circulation type contact grouting system of the bidirectional grout supply hole as claimed in claim 5, wherein: the slurry inlet branch pipe (31) and the slurry return branch pipe (32) penetrate through the steel plate (6) and are welded with the steel plate (6), and the steel plate (6) is located at the orifice of the grouting hole (4).
7. The use method of the internal circulation type contact grouting system for the bidirectional grout supply hole according to any one of claims 1 to 6, characterized by comprising the following steps:
step 1: drilling grouting holes (4), wherein the grouting holes (4) are vertical to the slope surface, a row of drilling holes are arranged at intervals of 2m in the elevation direction, and the pitch between the rows of grouting holes (4) is 2.5 m; after drilling is finished, flushing out rock powder and other substances in the hole by adopting high-flow water flow until backwater is clarified;
step 2: installing a contact grouting pipeline, and installing a slurry inlet branch pipe (31) and a slurry return branch pipe (32) in the grouting hole (4); the slurry inlet branch pipe (31) extends into the bottom of the grouting hole (4) and is 10cm away from the bottom of the hole; the slurry return branch pipe (32) extends into the position 5cm below the orifice of the grouting hole (4); the slurry inlet branch pipe (31) and the slurry return branch pipe (32) penetrate through the steel plate (6) and are welded with the steel plate (6); the steel plate (6) is positioned at the orifice of the grouting hole (4), and the periphery of the steel plate is caulked by mortar;
and step 3: arranging a main slurry inlet pipe (1) on both sides of the upstream and downstream of the bank slope dam section, arranging the inlet of the main slurry inlet pipe (1) at a low elevation, and leading the inlet of the main slurry inlet pipe (1) to the downstream dam face; horizontal slurry inlet pipes (11) are led out of the slurry inlet main pipe (1) at intervals of 2m in the elevation direction, slurry outlet boxes (3) are pre-embedded on the horizontal slurry inlet pipes (11) at intervals of 2.5m, the horizontal slurry inlet pipes (11) are connected with the slurry inlet branch pipes (31) through three-way pipes (5), and slurry is led into the grouting holes (4); the inner diameters of the pulp inlet main pipe (1) and the horizontal pulp inlet pipe (11) are both 40mm, and the inner diameter of the pulp inlet branch pipe (31) is 32 mm;
the horizontal slurry return pipe (21) and the horizontal slurry inlet pipe (11) are arranged in parallel at a distance of 10-20 cm, so that the influence on dense concrete pouring of the dam is avoided; the horizontal slurry return pipe (21) is connected with a slurry return branch pipe (32) through a three-way pipe (5) to lead slurry out of the grouting hole (4); the two main slurry return pipes (2) are arranged in the middle of the bank slope dam section and respectively form a loop with the main slurry inlet pipes (1) on the two sides of the upstream and downstream, slurry in the high-elevation horizontal slurry return pipes (21) on the upstream side and the downstream side is collected, the outlets of the main slurry return pipes (2) are arranged at the high-elevation positions, and the outlets of the main slurry return pipes (2) are led to the downstream dam surface;
and 4, step 4: checking before grouting, wherein the opening degree of the seam face is required to be checked before contacting with grouting, and the opening degree of the seam face is not less than 0.5 mm. And carrying out water passing inspection on the pre-buried contact grouting pipeline, wherein the water passing pressure is 80% of the designed grouting pressure, and inspecting whether the grouting pipeline is smooth or not;
and 5: when the opening degree of the joint face meets the standard requirement and the grouting pipeline is unblocked, the contact grouting of the bank slope dam section can be carried out, two grouting pumps are arranged on the downstream dam face for contact grouting, a pressure gauge is installed on the grout return main pipe (2), and the grouting pressure is monitored;
step 6: and arranging an inspection hole after grouting, and analyzing the contact grouting effect by using the drilling coring and pressurized water data of the inspection hole after grouting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011505456.5A CN112647507A (en) | 2020-12-18 | 2020-12-18 | Bidirectional slurry supply hole internal circulation type contact grouting system and use method thereof |
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| CN202011505456.5A CN112647507A (en) | 2020-12-18 | 2020-12-18 | Bidirectional slurry supply hole internal circulation type contact grouting system and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117468415A (en) * | 2023-12-28 | 2024-01-30 | 中国电建集团西北勘测设计研究院有限公司 | Dam joint grouting device and grouting method |
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| CN106917409A (en) * | 2017-03-27 | 2017-07-04 | 中国水利水电第四工程局有限公司 | A kind of rock lid weight consolidation grouting construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201459678U (en) * | 2009-06-26 | 2010-05-12 | 中国水利水电第一工程局有限公司 | Special orifice device for circulating grouting in shallow bored hole |
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| CN204590030U (en) * | 2015-05-04 | 2015-08-26 | 周金春 | A kind of jam formula curtain grouting in foundation of dam device |
| CN106917409A (en) * | 2017-03-27 | 2017-07-04 | 中国水利水电第四工程局有限公司 | A kind of rock lid weight consolidation grouting construction method |
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| CN117468415A (en) * | 2023-12-28 | 2024-01-30 | 中国电建集团西北勘测设计研究院有限公司 | Dam joint grouting device and grouting method |
| CN117468415B (en) * | 2023-12-28 | 2024-03-19 | 中国电建集团西北勘测设计研究院有限公司 | Dam joint grouting device and grouting method |
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Application publication date: 20210413 |
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