CN111927351A - Wall-fixing chemical slurry construction method for constructing impervious wall by percussion drill - Google Patents
Wall-fixing chemical slurry construction method for constructing impervious wall by percussion drill Download PDFInfo
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- CN111927351A CN111927351A CN202010910228.XA CN202010910228A CN111927351A CN 111927351 A CN111927351 A CN 111927351A CN 202010910228 A CN202010910228 A CN 202010910228A CN 111927351 A CN111927351 A CN 111927351A
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- drilling
- hole
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- clay
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B1/00—Percussion drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
Abstract
The invention discloses a construction method of chemical slurry for fixing a wall of a diaphragm wall constructed by a percussion drill, wherein the chemical slurry is adopted as the slurry for fixing the wall of the diaphragm wall, and the cost of the slurry is less than 10% of that of bentonite slurry; the invention adopts the technical scheme that clay is filled into a drill hole in the drilling process, so that the drilling slag at the bottom of the drill hole is suspended in the clay slurry at the bottom, and the other parts of the drill hole adopt a chemical slurry wall-fixing process technology, thereby solving the problems; according to the slurry leakage plugging process, the pneumatic stirring drilling slag process technology is adopted, so that the mixed liquid of the drilling slag and the clay slurry at the bottom of the drill hole is blown by compressed air, the mixed liquid of the drilling slag, the clay slurry and the chemical slurry in the whole drill hole is subjected to leakage plugging, and the effect of the slurry leakage plugging process is superior to that of the bentonite slurry and the clay slurry.
Description
Technical Field
The invention belongs to the technical field of diaphragm wall construction, and particularly relates to a construction method of wall-fixing chemical slurry for a diaphragm wall constructed by a percussion drill.
Background
At present, the development of water conservancy and hydropower engineering is more and more remote, and the transportation cost of building materials for constructing hydropower stations is also increasingly higher. The raw material bentonite of the wall-fixing slurry of the diaphragm wall project of the hydropower station accounts for higher proportion in the construction cost of the diaphragm wall. In recent years, the chemical slurry is adopted to replace bentonite slurry for research and application in the construction of the impervious wall, and better economic and social benefits are obtained. In more remote projects, the cost of chemical mud is less than one tenth of the cost of bentonite mud. However, the use of the chemical slurry has certain limitation, the stratum particles are not large and are uniformly distributed, and a relatively serious leakage stratum does not exist, and the construction equipment adopts grab buckets, hydraulic slot milling machines, rotary drilling rigs, impact reverse circulation drilling rigs and the like, and the chemical slurry can be used as wall-fixing slurry of the impervious wall; the chemical slurry does not have the suspended drilling slag performance, the leaking stoppage effect of the stratum with serious leakage slurry is poor, the construction equipment adopts the processes of drilling by a percussion drill, deslagging by a deslagging barrel or positive circulation deslagging, and the chemical slurry is not suitable for being used as the impervious wall fixing slurry.
In the diaphragm wall engineering of the hydropower station, many projects are built in very complicated isolated and boulder strata, only a percussion drill is used for drilling, slurry loss in the construction process is very serious due to the overhead strata, and the slurry cost of the diaphragm wall is very high. If the cost of the impervious wall mud is reduced as much as possible, a process technology method of drilling holes by using a percussion drill and using chemical mud as wall-fixing mud under the condition of a complex stratum is researched.
Therefore, it is urgently needed to develop a construction method of wall-fixing chemical slurry for constructing the diaphragm wall by using the percussion drilling machine to solve the above problems.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a construction method of wall-fixing chemical slurry for constructing an impervious wall by using a percussion drill.
In order to achieve the purpose, the invention provides the following technical scheme:
the construction method of the wall-fixing chemical slurry for constructing the impervious wall by the percussion drill comprises the following steps:
s1, filling broken stone clay and water into the impervious wall guide groove;
s2, using a cross drill bit or a hollow drill bit to open a main hole;
s3, backfilling broken stone clay into the drilled hole, repeatedly drilling the hole, and repeating the step S2 at least once to ensure that the hole wall of the drilled hole opening is compact and stable;
s4, connecting an air pipe A into an inner pipe of the hollow drill bit, connecting the upper part of the air pipe A with an air pipe B, and connecting the other end of the air pipe B with an air outlet of an air compressor;
s5, according to the stratum condition, the stratum slurry leakage is not obvious, namely, an air compressor is not needed to be started, and only the percussion drill is started to drill the hole; if the stratum slurry leakage is obvious, an air compressor and a percussion drill are started to drill holes;
s6, continuously adding chemical slurry and a small amount of clay into the hole in the process of drilling the main hole, and forbidding adding clear water into the drilled hole; drilling, drilling slag and discharging slag; continuously drilling a main hole to the designed depth of the impervious wall, and stopping drilling;
s7, after the drilling of the main hole is finished, the drilling slag at the bottom of the hole is not required to be removed temporarily; simultaneously, appropriate clay is backfilled into the main hole;
s8, drilling the auxiliary hole, continuously adding chemical slurry and a small amount of clay into the hole in the whole drilling process, and forbidding adding clear water into the hole;
s9, drilling in the auxiliary hole, if the slurry leakage is obvious or serious, moving the impact drilling machine to the main hole for backfilling, and repeating the steps S4-S6;
and S10, after the diaphragm wall drilling is finished, cleaning the hole by adopting a gas lift reverse circulation method.
Specifically, in the step S1, the content of crushed stone in the crushed stone clay is 2/3-3/4, and the particle size of the crushed stone is 5-15 cm; in step S2, the main hole opening depth is less than 7 m; in the step S3, the content of broken stones in the backfilled broken stone clay is 2/3-3/4, and the particle size of the broken stones is 5-15 cm; the repeated drilling times are determined according to the stratum compaction degree, and the repeated drilling times are 1-3 times; in step S4, the inner diameters of the air ducts A and B are phi 25 mm.
Specifically, in step S5, the air compressor and the percussion drill are started to drill a hole, and the starting sequence is that the air compressor is started to supply air normally and then the percussion drill is started; if the contents of the drilling slag and the clay mud are too low to achieve the plugging effect, clay, sand or gravel soil can be continuously added into the drilled hole.
Specifically, in step S6, the method for stopping drilling includes: stopping the impact of the impact drilling machine, lifting a drill bit of the impact drilling machine out of a hole, then closing the air compressor, and stopping air supply; and the slag drilling and discharging adopts a sand pumping barrel to discharge slag and gas lift reverse circulation to discharge slag.
Specifically, in step S7, after the main hole drilling is finished, the drilling slag at the bottom of the hole is not removed, and an appropriate amount of clay is backfilled.
Specifically, the weight of a cross drill bit or a hollow drill bit used by the percussion drill is 3000-5000 kg; air quantity of air compressor is 3 ~ 4m3Min, and the pressure is 0.7-1.2 MPa.
Compared with the prior art, the invention has the beneficial effects that:
1. chemical slurry is adopted as the impervious wall fixing slurry, and the slurry cost is less than 10 percent of that of the bentonite slurry;
2. the invention adopts the technical scheme that clay is filled into a drill hole in the drilling process, so that the drilling slag at the bottom of the drill hole is suspended in the clay slurry at the bottom, and the other parts of the drill hole adopt a chemical slurry wall-fixing process technology, thereby solving the problems;
3. according to the slurry leakage plugging process, the pneumatic stirring drilling slag process technology is adopted, so that the mixed liquid of the drilling slag and the clay slurry at the bottom of the drill hole is blown by compressed air, the mixed liquid of the drilling slag, the clay slurry and the chemical slurry in the whole drill hole is subjected to leakage plugging, and the effect of the slurry leakage plugging process is superior to that of the bentonite slurry and the clay slurry.
Drawings
FIG. 1 is a schematic illustration of the drilling (main bore) opening of the present application;
FIG. 2 is a schematic illustration of a borehole (main bore) in the present application;
FIG. 3 is a schematic illustration of secondary hole drilling in the present application;
FIG. 4 is a second schematic diagram of secondary hole drilling in the present application;
FIG. 5 is a schematic diagram of the diaphragm wall cleaning.
The attached drawings are as follows: 1-cross drill bit, 2-crushed stone clay, 3-air compressor, 4-hollow drill bit, 5-air pipe A, 6-air pipe B, 7-slurry, 8-drilling slag, 9-slag discharge pipe, 10-hose A, 11-slurry purifier, 12-hose B, 13-main hole and 14-auxiliary hole.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The invention provides the following technical scheme:
the construction method of the wall-fixing chemical slurry for constructing the impervious wall by the percussion drill comprises the following steps:
s1, filling crushed stone clay 2 and water into the impervious wall guide groove as shown in figure 2;
s2, as shown in figure 2, using the cross bit 1 or the hollow bit 4 to open a main hole;
s3, as shown in figure 2, backfilling broken stone clay 2 into the drilled hole, repeatedly drilling the hole, and repeating the step S2 at least once to ensure that the hole wall of the drilled hole opening is compact and stable;
s4, as shown in figure 1, an air pipe A5 is connected into the inner pipe of the hollow drill bit 4, the upper part of the air pipe A5 is connected with an air pipe B6, and the other end of the air pipe B6 is connected with an air outlet of the air compressor 3;
s5, as shown in figure 1, according to the stratum condition, the stratum slurry leakage is not obvious, namely the air compressor 3 is not needed to be started, and the percussion drill is only started to drill the hole; if the stratum leaks slurry obviously, starting the air compressor 3 and the percussion drill to drill holes;
s6, as shown in figure 1, in the process of drilling the main hole 13, continuously adding the chemical mud 7 and a small amount of clay into the hole, and forbidding adding clear water into the drilled hole; drilling, drilling and slag 8 discharging; continuously drilling the main hole 13 to the designed depth of the impervious wall, and stopping drilling;
s7, as shown in figure 1, after the main hole 13 is drilled, the drilling slag 8 at the bottom of the hole is not removed temporarily; meanwhile, appropriate clay is backfilled into the main hole 13;
s8, as shown in figure 3, drilling the auxiliary hole 14, continuously adding the chemical mud 7 and a small amount of clay into the hole in the whole drilling process, and forbidding adding clear water into the hole;
s9, as shown in figure 4, drilling the secondary hole 14, if the slurry leakage is obvious or serious, moving the impact drilling machine to the main hole 13 to drill and backfill, and repeating the steps S4-S6;
s10, as shown in figure 5, after the diaphragm wall drilling is finished, cleaning the hole by adopting a gas lift reverse circulation method.
In some embodiments, in step S1, the crushed stone clay 2 contains 2/3-3/4 crushed stones, and the crushed stone particle size is 5-15 cm; in step S2, the main hole 13 is opened to a depth of less than 7 m; in the step S3, the content of broken stones in the backfilled broken stone clay 2 is 2/3-3/4, and the particle size of the broken stones is 5-15 cm; the repeated drilling times are determined according to the stratum compaction degree, and the repeated drilling times are 1-3 times; in step S4, the inside diameters of the air duct A5 and the air duct B6 are set to be phi 25 mm.
In some embodiments, in step S5, the air compressor 3 and the percussion drill are started to drill a hole, and the starting sequence is that the air compressor 3 is started to supply air normally and then the percussion drill is started; if the contents of the drilling slag and the clay mud are too low to achieve the plugging effect, clay, sand or gravel soil can be continuously added into the drilled hole.
In some embodiments, in step S6, the method for stopping drilling is: stopping the impact of the impact drilling machine, lifting a drill bit of the impact drilling machine out of a hole, then closing the air compressor 3, and stopping air supply; and the slag of the drilling slag 8 is discharged by a sand pumping barrel or gas lift reverse circulation.
In some embodiments, in step S7, after the drilling of the main hole 13 is finished, the drilling mud at the bottom of the hole is not removed, and an appropriate amount of clay is backfilled.
In some embodiments, the cross bit 1 or the hollow bit 4 used in the percussion drill has a weight of 3000 to 5000 kg; the air quantity of the air compressor 3 is 3-4 m3Min, and the pressure is 0.7-1.2 MPa.
In this application, the clay quality of filling into does not do the requirement in to drilling, and the main effect of clay makes the drilling mud of hole bottom suspend in the clay mud of drilling bottom, and solid wall mud is chemical mud, has solved the engineering and has not had the difficult problem of qualified clay locally.
The crushed stone clay 2 contains crushed stones and pebbles;
in the drilling process, if the slurry leakage of the drilled hole is not obvious, the chemical slurry can achieve the effect of slurry wall fixation; if the slurry leakage of the drill hole is obvious or serious, the mixed liquid of the drilling slag and the clay slurry at the bottom of the hole is blown by compressed air, so that the contents of the drilling slag and the clay particles in the whole drilling slurry are high, a slurry leakage channel can be effectively and quickly blocked, and the plugging effect is superior to plugging measures of mixing sawdust, lime and the like in bentonite slurry and clay slurry.
As shown in fig. 5, after the diaphragm wall drilling is finished, two reinforcing steel bars with the diameter of 20mm are welded at the bottom of the slag discharging pipe 9, and the slag discharging pipe 9 is ensured to be 15 cm-20 cm away from the bottom of the hole; an air pipe B6 is connected to the slag discharging pipe 9 about 200cm from the bottom, the top of the slag discharging pipe 9 is connected with a hose A10, and the other end of the hose A10 is connected with a mud purifier 11; the mud outlet of the mud purifier 11 is connected with a hose B12, and the other end of the hose B12 is placed in the slot of the impervious wall. Namely, a gas lift reverse circulation method is adopted for hole cleaning.
The slag discharge pipe 9 is a steel pipe with the inner diameter phi of 100 mm-phi 150mm, and the hose A10 and the slag discharge pipe 9 have the same diameter.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The construction method of the wall-fixing chemical slurry for constructing the impervious wall by the percussion drill is characterized by comprising the following steps of:
s1, filling broken stone clay (2) and water into the impervious wall guide groove;
s2, a cross drill bit (1) or a hollow drill bit (4) is used for drilling a main hole;
s3, backfilling broken stone clay (2) into the drilled hole, repeatedly drilling the hole, and repeating the step S2 at least once to ensure that the hole wall of the drilled hole opening is compact and stable;
s4, connecting an air pipe A (5) into an inner pipe of the hollow drill bit (4), connecting the upper part of the air pipe A (5) with an air pipe B (6), and connecting the other end of the air pipe B (6) with an air outlet of the air compressor (3);
s5, according to the stratum condition, the air compressor (3) is not needed to be started when the stratum leakage is not obvious, and the percussion drill is only started to drill the hole; if the stratum leaks slurry obviously, the air compressor (3) and the percussion drill are started to drill holes;
s6, continuously adding chemical slurry (7) and a small amount of clay into the main hole (13) during drilling, and forbidding adding clear water into the drilled hole; drilling, drilling and slag (8) discharging; continuously drilling a main hole (13) to the designed depth of the impervious wall, and stopping drilling;
s7, after the drilling of the main hole (13) is finished, the drilling slag (8) at the bottom of the hole is not removed temporarily; simultaneously, appropriate clay is backfilled into the main hole (13);
s8, drilling the auxiliary hole (14), continuously adding chemical slurry (7) and a small amount of clay into the hole in the whole drilling process, and forbidding adding clear water into the hole;
s9, drilling in the auxiliary hole (14), if slurry leakage is obvious or serious, moving the percussion drill to the main hole (13) for backfilling, and repeating the steps S4-S6;
and S10, after the diaphragm wall drilling is finished, cleaning the hole by adopting a gas lift reverse circulation method.
2. The construction method of the wall-fixing chemical mud for the diaphragm wall constructed by the percussion drill according to the claim 1, wherein in the step S1, the content of the broken stone in the broken stone clay (2) is 2/3-3/4, and the particle size of the broken stone is 5-15 cm; in step S2, the opening depth of the main hole (13) is less than 7 m; in the step S3, the content of broken stones in the backfilled broken stone clay (2) is 2/3-3/4, and the particle size of the broken stones is 5-15 cm; the repeated drilling times are determined according to the stratum compaction degree, and the repeated drilling times are 1-3 times; in step S4, the inside diameters of the duct A (5) and the duct B (6) are set to be phi 25 mm.
3. The method for constructing the wall-fixing chemical mud for the diaphragm wall by using the impact drilling machine as claimed in claim 1, wherein in the step S5, the air compressor (3) and the impact drilling machine are started to drill the hole, and the starting sequence is that the air compressor (3) is started to supply air normally and then the impact drilling machine is started; if the contents of the drilling slag and the clay mud are too low to achieve the plugging effect, clay, sand or gravel soil can be continuously added into the drilled hole.
4. The method for constructing a solid wall chemical mud for an impervious wall by using a percussion drill according to claim 1, wherein the step of stopping drilling in step S6 comprises the steps of: stopping the impact of the impact drilling machine, lifting a drill bit of the impact drilling machine out of the hole, then closing the air compressor (3) and stopping air supply; and the slag of the drilling slag (8) is discharged by a sand pumping barrel and air lift reverse circulation.
5. The method for constructing the solid wall chemical mud of the diaphragm wall by the percussion drill according to the claim 1, wherein in the step S7, after the main hole (13) is drilled, the drilling slag at the bottom of the hole is not removed, and a proper amount of clay is backfilled.
6. The construction method of the wall-fixing chemical mud for the diaphragm wall constructed by the impact drill according to the claim 1, characterized in that the weight of the cross bit (1) or the hollow bit (4) used by the impact drill is 3000-5000 kg; the air volume of the air compressor (3) is 3-4 m3Min, and the pressure is 0.7-1.2 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010910228.XA CN111927351B (en) | 2020-09-02 | 2020-09-02 | Wall-fixing chemical slurry construction method for constructing impervious wall by percussion drill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010910228.XA CN111927351B (en) | 2020-09-02 | 2020-09-02 | Wall-fixing chemical slurry construction method for constructing impervious wall by percussion drill |
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| CN111927351A true CN111927351A (en) | 2020-11-13 |
| CN111927351B CN111927351B (en) | 2022-11-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322064A (en) * | 2011-06-30 | 2012-01-18 | 中铁二十局集团有限公司 | Construction method for underground diaphragm wall of deep foundation pit for subway station in collapsible loess areas |
| CN103161178A (en) * | 2013-03-26 | 2013-06-19 | 葛洲坝集团基础工程有限公司 | Grooving drilling construction method of diaphragm wall |
| CN105350569A (en) * | 2015-09-24 | 2016-02-24 | 中国水利水电第七工程局成都水电建设工程有限公司 | Diaphragm wall parallel drilling method grooving process |
| CN108586826A (en) * | 2018-05-18 | 2018-09-28 | 河北金丰新材料科技有限公司 | Composite chemical mud materials and preparation method thereof |
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2020
- 2020-09-02 CN CN202010910228.XA patent/CN111927351B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322064A (en) * | 2011-06-30 | 2012-01-18 | 中铁二十局集团有限公司 | Construction method for underground diaphragm wall of deep foundation pit for subway station in collapsible loess areas |
| CN103161178A (en) * | 2013-03-26 | 2013-06-19 | 葛洲坝集团基础工程有限公司 | Grooving drilling construction method of diaphragm wall |
| CN105350569A (en) * | 2015-09-24 | 2016-02-24 | 中国水利水电第七工程局成都水电建设工程有限公司 | Diaphragm wall parallel drilling method grooving process |
| CN108586826A (en) * | 2018-05-18 | 2018-09-28 | 河北金丰新材料科技有限公司 | Composite chemical mud materials and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 侯丽君等: "复杂地层混凝土防渗墙造孔技术探讨", 《四川水力发电》 * |
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