CN110374083B - Double-pressure control impact extrusion grouting system and construction method thereof - Google Patents
Double-pressure control impact extrusion grouting system and construction method thereof Download PDFInfo
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- CN110374083B CN110374083B CN201910626120.5A CN201910626120A CN110374083B CN 110374083 B CN110374083 B CN 110374083B CN 201910626120 A CN201910626120 A CN 201910626120A CN 110374083 B CN110374083 B CN 110374083B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 81
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 176
- 238000005553 drilling Methods 0.000 claims abstract description 133
- 230000001105 regulatory effect Effects 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 238000003860 storage Methods 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims description 48
- 230000009977 dual effect Effects 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims description 22
- 230000001276 controlling effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 238000011049 filling Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 238000004537 pulping Methods 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 16
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000003973 irrigation Methods 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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Abstract
The invention provides a double-pressure control impact extrusion grouting system and a construction method thereof, wherein the grouting system comprises a geological drilling machine, a slurry storage stirring barrel and a pulse grouting pump, the slurry storage stirring barrel is communicated with a drilling machine faucet in the geological drilling machine, an orifice sleeve is arranged in an orifice of a stratum drilling hole, the double-pressure control impact extrusion grouting system further comprises an orifice sealer which is sleeved on a round vertical shaft drill rod, the lower end of the orifice sealer is connected with the upper end of the orifice sleeve, an orifice sealer slurry return interface is arranged on the orifice sealer, a slurry return pressure regulating device is arranged at the interface, and a slurry inlet pressure regulating device is connected to a drilling slurry inlet pipe. The grouting system can realize the control of the pulse pulp feeding pressure and the pulse pulp returning pressure under the condition of double blocking of the inside and the orifice, not only can promote the hole bottom drilling pulse pulp feeding pressure by means of the superposition effect of the orifice pulse pulp returning pressure, but also can further generate the effective re-grouting effect on the filled hole section by means of the control effect of the orifice pulse pulp returning pressure; the operation is convenient, and the grouting quality is good.
Description
Technical Field
The invention relates to the technical field of soft foundation reinforcement and anti-seepage grouting treatment, in particular to a double-pressure control impact extrusion grouting system for soft foundation reinforcement and anti-seepage grouting treatment and a construction method thereof.
Background
For the reinforcement and seepage-proofing grouting treatment of soft foundations, the technical defect of low-pressure repeated splitting ineffective grouting of a small main stress surface is commonly existed at present. The patent document with the patent number ZL201210348150.2 proposes a drilling and grouting integrated, top-down and high-pressure impact extrusion grouting method, and the controllability and effectiveness of the grouting reinforcement and seepage prevention technology of the soft stratum are greatly improved.
However, as the grouting method disclosed by the patent is an orifice open type drilling and grouting integrated construction, on one hand, the size of the drilling and grouting integrated impact extrusion grouting pressure is limited to a certain extent; on the other hand, as no orifice closed slurry returning control device is arranged, the upper part of the filled hole Duan Jiben loses the re-filling effect in the drilling and filling process, and the grouting quality still needs to be further improved.
Disclosure of Invention
The invention mainly aims to provide a double-pressure control impact extrusion grouting system and a construction method thereof, when the grouting system and the method are adopted to perform drilling and grouting integrated impact extrusion grouting on a soft stratum, the double-pressure control of pulse grouting pressure and pulse back grouting pressure can be simultaneously performed, the drilling and grouting pulse grouting pressure at the bottom of a hole can be improved by means of the orifice pulse back grouting pressure superposition effect, and an effective re-grouting effect can be further generated on a filled hole section by means of the orifice pulse back grouting pressure control effect.
In order to achieve the above object, according to one aspect of the present invention, there is provided a dual pressure control impact grouting system, comprising a geological drilling machine, a slurry storage stirring barrel and an impact grouting pump, wherein the geological drilling machine is provided with a hollow round vertical shaft drill pipe, the upper end of the round vertical shaft drill pipe is provided with a drilling faucet, the lower end of the round vertical shaft drill pipe is connected with an impact grouting machine, the slurry storage stirring barrel is communicated with the impact grouting pump through a slurry suction pipe, the outlet of the impact grouting pump is communicated with a drilling grouting pipe, the drilling grouting pipe is communicated with the drilling faucet, an orifice sleeve is arranged in an orifice of a stratum drilling, the impact grouting machine penetrates through the orifice sleeve and extends into a stratum to be drilled, the inner cavities of the drilling grouting pipe, the drilling faucet, the round vertical shaft drill pipe and the impact grouting machine are communicated to form an impact grouting supply channel, the dual pressure control impact grouting system further comprises an orifice sealer, the lower end of the orifice sealer is sleeved on the round vertical shaft drill pipe is connected with the upper end of the orifice sleeve, the orifice sealer is provided with a slurry recharging interface communicated with the inner cavity of the orifice sleeve, the orifice sealer is arranged at the position of the orifice sealer, the pressure adjusting device is connected with a pressure adjusting device.
Further, the orifice sealer comprises an outer sealing sleeve, the upper end of the outer sealing sleeve is in threaded connection with an upper lock sleeve, the lower end of the outer sealing sleeve is in threaded connection with a three-way lock sleeve, an elastic sealing sleeve is arranged inside the outer sealing sleeve, the upper end of the elastic sealing sleeve is embedded between the outer sealing sleeve and the upper lock sleeve and in threaded connection with the upper lock sleeve, the lower end of the elastic sealing sleeve is embedded between the outer sealing sleeve and the three-way lock sleeve and in threaded connection with the three-way lock sleeve, the orifice sealer slurry return interface is arranged on the three-way lock sleeve and is communicated with the inner cavity of the three-way lock sleeve, a liquid filling sealing cavity is formed between the outer sealing sleeve and the elastic sealing sleeve, and the outer sealing sleeve is connected with a liquid filling pump through a liquid filling pipe.
Further, the pulp feeding pressure regulating and controlling device comprises a three-way pipe, a pulp feeding pressure control gate valve and a pulp feeding pressure gauge, one interface of the three-way pipe is communicated with a pulp outlet of the pulse grouting pump, the other two interfaces of the three-way pipe are respectively communicated with the pulp feeding pressure gauge and the pulp feeding pressure control gate valve, the pulp feeding pressure gauge is arranged between the drilling grouting pulp feeding pipe and the pulp feeding pressure control gate valve, and an outlet end of the pulp feeding pressure control gate valve is communicated with the pulp storage stirring barrel through a pulp returning pipe.
Further, the back-slurry pressure regulating device comprises a back-slurry pressure control gate valve and a back-slurry pressure gauge, wherein the back-slurry pressure gauge is arranged between a back-slurry interface of the orifice sealer and the back-slurry pressure control gate valve, and the outlet end of the back-slurry pressure control gate valve is connected with a drilling and grouting back-slurry pipe.
Further, the double-pressure control impact extrusion grouting system further comprises a slurry returning and sand removing device, the slurry returning and sand removing device comprises a sand removing vibrating screen, the sand removing vibrating screen is arranged at the tail end of the drilling and grouting slurry returning pipe, the lower stirring barrel of the sand removing vibrating screen is connected with a slurry conveying pump, and the outlet end of the slurry conveying pump is communicated with the slurry storing stirring barrel through a slurry returning and conveying pipe.
Further, a filter screen for filtering the slurry conveyed in the slurry returning and conveying pipe is arranged at the communication part of the slurry returning and conveying pipe and the slurry storage stirring barrel.
Further, the impact extrusion grouting machine tool comprises a geological drill rod, the upper end of the geological drill rod is connected with the round vertical shaft drill rod, the lower end of the geological drill rod is connected with a drilling tool, a full-section drill bit is arranged at the lower part of the drilling tool, and the diameter of the geological drill rod is smaller than or equal to 91mm.
Further, the depth of the orifice sleeve below the ground is not less than 1.5m, and the height of the orifice sleeve above the ground is not more than 0.1m.
Further, the double-pressure control impact extrusion grouting system also comprises a pulping barrel, and the pulping barrel is communicated with the pulp storage stirring barrel through a pulping conveying pipe.
According to another aspect of the present invention, there is provided a dual pressure control impact extrusion grouting construction method for impact extrusion grouting using the dual pressure control impact extrusion grouting system, the construction method comprising the steps of:
S1: a double-pressure control impact extrusion grouting system is arranged at the position where impact extrusion grouting operation is to be implemented;
s2: determining drilling and grouting section control technical parameters by field test according to stratum conditions and engineering requirements of a to-be-implemented impact extrusion grouting operation, wherein the drilling and grouting section control technical parameters comprise drilling and grouting section length, pulse grouting pressure and injection rate ending standard;
s3: according to the requirement of the sealing fit length of the round vertical shaft drill rod and the orifice sealer in the drilling and grouting process of each drilling and grouting section, the total length of the impact extrusion grouting machine tool is configured, and the impact extrusion grouting machine tool is sequentially placed into and connected with the grouting hole;
S4: stirring grout according to the grouting grout allocation requirement, starting a pulse grouting pump, regulating and controlling the pulse grouting pressure to be greater than or equal to the designed pulse grouting pressure through a grouting pressure regulating and controlling device, regulating and controlling the pulse grouting pressure to be equal to the designed pulse grouting pressure through a grouting pressure regulating and controlling device, and starting a geological drilling rig to sequentially perform drilling and grouting integrated impact extrusion grouting on grouting hole sections from top to bottom under the condition of double pressure control;
S5: and (3) continuously performing in-section up-down rotary impact extrusion grouting after drilling of each drilling and grouting section is completed, and performing drilling and grouting control according to the determined drilling and grouting section control technical parameters, wherein the control standard is as follows: the drilling and grouting section impact extrusion grouting reaches the pulse pulp inlet pressure and the pulse pulp return pressure which are specified by the design, meets the injection rate ending standard, can end the drilling and grouting section impact extrusion grouting, and continues the drilling and grouting of the next drilling and grouting section;
s6: and (3) after the drilling and grouting integrated impact extrusion grouting is finished under the condition of full-hole section double-pressure control, full-hole Duan Jixie backfilling grouting is carried out.
Compared with the prior art, the invention has the beneficial effects that: compared with the prior drilling and grouting integrated, top-down and high-pressure impact extrusion grouting method, the invention adds the orifice sealer capable of dynamically sealing the drilling and grouting at the orifice of the drilling hole, can realize the dual-pressure control of the pulse pulp feeding pressure and the pulse pulp returning pressure under the condition of double sealing and blocking of the inside and the orifice in the drilling and grouting integrated impact extrusion grouting process, not only can improve the pulse pulp feeding pressure of the drilling hole at the bottom of the drilling hole by means of the superposition effect of the pulse pulp returning pressure of the orifice, but also can further generate the effective re-grouting effect on the filled hole section by means of the control effect of the pulse pulp returning pressure of the orifice, thereby realizing the more effective and controllable in-situ impact extrusion drilling and grouting integrated grouting for the soft stratum and achieving better grouting quality effect.
The beneficial effects are as follows: the double-pressure control impact extrusion grouting system is additionally provided with the set of slurry returning and sand removing device, and can effectively perform vibration sand removing and purifying treatment on slurry returning in the drilling and grouting process in real time, so that the grouting performance of slurry in the whole drilling and grouting process can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic structural diagram of a dual pressure control impact extrusion grouting system according to an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of an orifice sealer in a dual pressure control impact extrusion grouting system according to an embodiment of the present invention.
Fig. 3 is a partial enlarged view at a in fig. 1.
Fig. 4 is a partial enlarged view at B in fig. 1.
Fig. 5 is a partial enlarged view at C in fig. 1.
Wherein the above figures include the following reference numerals:
10. Geological drilling machine; 11. a round vertical shaft drill rod; 12. a water tap of a drilling machine; 20. a slurry storage stirring barrel; 30. a pulse grouting pump; 40. a punching and extruding grouting machine; 41. geological drill pipe; 42. drilling tool; 43. a full face drill bit; 50. drilling and grouting a slurry pipe; 60. an orifice sleeve; 70. an orifice sealer; 71. an outer sealing sleeve; 72. a lock sleeve is arranged on the upper lock sleeve; 73. a three-way lock sleeve; 74. an elastic sealing sleeve; 75. a slurry return interface of the orifice sealer; 76. a liquid-filled sealed cavity; 77. a liquid filling pipe; 78. a liquid filling pump; 80. drilling, grouting and returning a slurry pipe; 90. a back slurry pressure regulating device; 91. a back slurry pressure control gate valve; 92. a back sizing pressure gauge; 100. a pulp inlet pressure regulating device; 101. a three-way pipe; 102. slurry inlet pressure control gate valve; 103. a pulp inlet pressure gauge; 110. a back slurry sand removing device; 111. a desanding vibrating screen; 112. a slurry transfer pump; 120. filtering and screening; 130. pulping barrel.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings and exemplary embodiments for the purpose of facilitating an understanding of the invention, but the scope of the invention is not limited to the specific embodiments described below. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. As used in the specification and claims of the present application, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
Example 1
The double-pressure control impact extrusion grouting system provided by the embodiment of the invention can be widely applied to the fields of hydropower, municipal administration, railways, highway bridges, ports, airports and the like for carrying out foundation reinforcement and seepage prevention grouting treatment on poor geologic bodies such as loose, weak and the like. The structure of the dual pressure control impact extrusion grouting system is schematically shown in fig. 1 to 5, and as can be seen from the figures, the dual pressure control impact extrusion grouting system mainly comprises a geological drilling rig 10, a slurry storage stirring barrel 20 and a pulse grouting pump 30. Wherein, the geological drilling machine 10 is provided with a round vertical shaft drill rod 11 with a hollow structure, the upper end of the round vertical shaft drill rod 11 is provided with a drilling machine tap 12, and the lower end of the round vertical shaft drill rod 11 is connected with a impact extrusion grouting machine tool 40. The slurry storage stirring barrel 20 is communicated with the pulse grouting pump 30 through a slurry suction pipe, the outlet of the pulse grouting pump 30 is communicated with a drilling grouting pipe 50, and the other end of the drilling grouting pipe 50 is communicated with the water tap 12 of the drilling machine. An orifice sleeve 60 is cast into the orifice of the formation borehole, and the impact grouting tool 40 extends through the orifice sleeve 60 into the formation to be drilled. The inner cavities of the drilling grouting pipe 50, the drilling machine tap 12, the round vertical shaft drill pipe 11 and the impact extrusion grouting machine 40 are communicated to form an impact extrusion grouting slurry supply channel. The dual pressure control impact extrusion grouting system also comprises an orifice sealer 70, wherein the orifice sealer 70 is sleeved on the round vertical shaft drill rod 11, and the lower end of the orifice sealer 70 is connected with the upper end of the orifice sleeve 60 through pipe threads. An orifice sealer slurry return port 75 communicating with the inner cavity of the orifice sleeve 60 is provided on the orifice sealer 70, a slurry return pressure regulating device 90 is installed at the orifice sealer slurry return port 75, and a slurry inlet pressure regulating device 100 is connected to the drilling and grouting pipe 50.
In the double-pressure control impact extrusion grouting system, the upper end of the orifice sleeve 60 is connected with the orifice sealer 70, the orifice sealer slurry return interface 75 is provided with the slurry return pressure regulating device 90, and the drilling grouting pipe 50 is connected with the slurry inlet pressure regulating device 100; the impact grouting machine 40 and the hole wall are closed and blocked to form hole bottom impact grouting pressure, the round vertical shaft drill rod 11 and the hole opening sealer 70 are closed to form hole opening impact grouting pressure, the impact grouting slurry inlet amount and the impact grouting pressure are regulated and controlled by the grouting pressure regulating and controlling device 100, the impact grouting hole opening grouting pressure is regulated and controlled by the grouting pressure regulating and controlling device 90, and drilling and grouting integrated impact grouting under the condition of double pressure control is realized. When the dual-pressure control impact extrusion grouting system is used for drilling and grouting integrated impact extrusion grouting of a soft stratum, the dual-pressure control of the pulse grouting pressure and the pulse slurry return pressure under the condition of dual sealing and blocking of the hole and the hole opening can be realized, the pulse grouting pressure of the hole bottom drilling and grouting can be improved by means of the superposition effect of the hole opening pulse slurry return pressure, and the effective re-grouting effect can be further generated on the filled hole section by means of the control effect of the hole opening pulse slurry return pressure; the process is convenient and fast to operate, effective and controllable, and the grouting quality effect is better.
Specifically, referring to fig. 1 and 2, in the present embodiment, the orifice sealer 70 includes an outer jacket tube 71, an upper lock sleeve 72 is screw-coupled to an upper end of the outer jacket tube 71, and a three-way lock sleeve 73 is screw-coupled to a lower end of the outer jacket tube 71. An elastic sealing sleeve 74 is arranged in the outer sealing sleeve 71, the upper end of the elastic sealing sleeve 74 is embedded between the outer sealing sleeve 71 and the upper lock sleeve 72 and is in threaded connection with the upper lock sleeve 72, and the lower end of the elastic sealing sleeve 74 is embedded between the outer sealing sleeve 71 and the three-way lock sleeve 73 and is in threaded connection with the three-way lock sleeve 73. The outer diameter of the round shaft drill rod 11 matches the inner diameter of the elastic gland 74. The orifice sealer slurry return interface 75 is arranged on the three-way lock sleeve 73 and is communicated with the inner cavity of the three-way lock sleeve 73, a liquid filling sealing cavity 76 is formed between the outer sealing sleeve 71 and the elastic sealing sleeve 74, and the outer sealing sleeve 71 is connected with a liquid filling pump 78 through a liquid filling pipe 77. The lower end of the three-way lock sleeve 73 in the orifice sealer 70 is connected with the upper end of the orifice sleeve 60 by pipe screw. When sealing is needed, the liquid filling pump 78 is operated to fill liquid (such as water) into the liquid filling sealing cavity 76, the elastic sealing sleeve 74 generates elastic internal expansion under the action of liquid pressure to quickly seal the round vertical shaft drill rod 11, and when the liquid filling sealing cavity 76 is discharged and depressurized, the elastic sealing sleeve 74 quickly and elastically retracts. The elastomeric boot seal 74 is preferably a high elastic wire braided rubber tube.
Referring to fig. 1 and 3, in the present embodiment, a pulp feeding pressure regulating device 100 includes a tee 101, a pulp feeding pressure control gate valve 102, and a pulp feeding pressure gauge 103. One interface of the three-way pipe 101 is communicated with a slurry outlet of the pulse grouting pump 30, and the other two interfaces of the three-way pipe 101 are respectively communicated with a slurry inlet pressure gauge 103 and a slurry inlet pressure control gate valve 102. The slurry inlet pressure gauge 103 is installed between the drilling and grouting pipe 50 and the slurry inlet pressure control gate valve 102, and the outlet end of the slurry inlet pressure control gate valve 102 is communicated with the slurry storage stirring barrel 20 through a slurry return pipe. With the above-described configuration, the slurry inlet pressure in the drill grouting pipe 50 is obtained by the slurry inlet pressure gauge 103, and the slurry inlet pressure can be conveniently adjusted by the slurry inlet pressure control gate valve 102. When the slurry inlet pressure does not reach the set slurry inlet pressure value, the slurry flow in the slurry returning pipe is reduced through the slurry inlet pressure control gate valve 102, and the pulse slurry flow of the drilling and grouting slurry pipe 50 is increased to improve the pulse slurry inlet pressure; when the slurry inlet pressure exceeds the set slurry inlet pressure value, the slurry flow in the slurry return pipe is increased by the slurry inlet pressure control gate valve 102, and the pulse slurry flow of the drilling and grouting slurry pipe 50 is reduced to reduce the pulse slurry inlet pressure.
Referring to fig. 1 and 4, in the present embodiment, the slurry pressure regulating device 90 includes a slurry pressure control gate valve 91 and a slurry pressure gauge 92, the slurry pressure gauge 92 is installed between the orifice sealer slurry return port 75 and the slurry pressure control gate valve 91, and the outlet end of the slurry pressure control gate valve 91 is connected to a drill and irrigate slurry return pipe 80. So configured, the back slurry pressure of the slurry coming out of the orifice sealer back slurry port 75 is obtained by the back slurry pressure gauge 92, and then the back slurry pressure is adjusted by the back slurry pressure control gate valve 91. When the back slurry pressure does not reach the set back slurry pressure value, the back slurry flow rate is reduced by the back slurry pressure control gate valve 91; when the back pulp pressure exceeds the set back pulp pressure value, the back pulp flow rate is increased by the back pulp pressure control gate valve 91.
In order to solve the problem, referring to fig. 1 and 5, the dual-pressure control impact extrusion grouting system further comprises a back slurry sand removing device 110, the back slurry sand removing device 110 comprises a sand removing vibrating screen 111, the sand removing vibrating screen 111 is arranged at the tail end of the drilling and grouting back slurry pipe 80, a slurry conveying pump 112 is connected to a stirring barrel at the lower part of the sand removing vibrating screen 111, and the outlet end of the slurry conveying pump 112 is communicated with the slurry storage stirring barrel 20 through a back slurry conveying pipe. By arranging the slurry returning and sand removing device 110, the slurry returning in the drilling and grouting process can be effectively subjected to vibration sand removing and purifying treatment in real time, so that the grouting performance of the slurry in the whole drilling and grouting process can be ensured.
Further, referring to fig. 1, in the present embodiment, a filter screen 120 is installed at a connection point of the back-slurry feeding pipe and the slurry storage agitator 20. The returned slurry purified by the slurry-returning and sand-removing device 110 is filtered again by the filter screen 120 before entering the slurry-storing stirring tank 20, so that sand particles contained in the returned slurry can be further removed, and the purifying effect can be further improved.
Specifically, in the present embodiment, the impact grouting tool 40 includes a geological drill pipe 41, the upper end of the geological drill pipe 41 is connected with the round shaft drill pipe 11, the lower end of the geological drill pipe 41 is connected with a drilling tool 42, and a full face drill 43 is mounted on the lower portion of the drilling tool 42. The geological drill 41 is a small bore high strength drill with a diameter less than or equal to 91mm. The depth to which the orifice sleeve 60 is disposed below the ground is preferably not less than 1.5m, and the height to which the orifice sleeve 60 is exposed above the ground is preferably not more than 0.1m. The dual pressure controlled impact extrusion grouting system further comprises a pulping barrel 130, wherein the pulping barrel 130 is communicated with the pulp storage stirring barrel 20 through a pulping and pulp conveying pipe. The high-speed pulping can be performed on a construction site.
The geological drilling rig 10 used in the dual pressure control impact extrusion grouting system of the embodiment can adopt a vertical shaft type or power head type drilling rig for geological exploration; the round vertical shaft drill rod 11 can be a driving drill rod sleeved in a vertical shaft sleeve of the drilling machine or connected to a power head of the drilling machine; the drill tap 12 may be a conventional geological drill high pressure tap; the slurry storage stirring tank 20 and the slurry making tank 130 may employ the slurry storage stirring tank 20 and the slurry making tank 130 used in conventional grouting; the pulse grouting pump 30 can adopt a high-pressure pulse grouting pump 30 special for impact extrusion grouting, and can also adopt a pulse grouting pump 30 formed by discharging 1-2 grouting valve seat balls and a grouting port pressure stabilizing tank by a common reciprocating plunger type high-pressure grouting pump.
Example 2
The double-pressure control impact extrusion grouting construction method of the embodiment of the invention is applied to a certain foundation anti-seepage grouting engineering example, and comprises the following specific steps:
(1) The dual pressure control impact extrusion grouting system of the embodiment 1 of the invention is installed at the position where impact extrusion grouting operation is to be implemented, and comprises a geological drilling rig 10, an impact grouting pump 30, a slurry storage stirring barrel 20, a slurry preparation barrel 130, and connection installation of a slurry returning sand removing device 110, a drilling grouting pipe 50, a drilling grouting pipe 80, an orifice sealer 70, a slurry inlet pressure regulating device 100 and the like, wherein the specific structure after installation is shown in fig. 1;
(2) According to stratum conditions and engineering design requirements, the control parameters of the double-pressure control impact extrusion grouting are determined through field tests and are shown in the following table 1:
table 1 parameter control table for drilling and grouting integrated impact extrusion grouting construction under double pressure control condition
(3) Drilling and pouring holes, wherein the diameter of each hole is 110mm, the depth of each hole is 2.0m, and 0.5:1, casting an orifice sleeve 60 with the length of 2.1m and the outer diameter of 108mm into thick cement slurry, wherein the casting depth of the orifice sleeve 60 is 2.0m below the ground, and the exposed height above the ground is 0.1m;
(4) Installing an orifice sealer 70 connected to a back slurry pressure regulating device 90;
(5) According to the requirement of the sealing fit length of the round vertical shaft drill rod 11 and the orifice sealer 70 in the drilling and grouting process of each drilling and grouting section, the total length of the impact extrusion grouting machine 40 is configured, and the impact extrusion grouting machine 40 is sequentially arranged and connected in the grouting hole;
(6) Cement stable slurry is adopted for drilling and grouting, and the slurry proportion and performance are carried out according to the table 2;
Table 2 cement stabilized slurry formulation and performance table
(7) Starting a pulse grouting pump 30, regulating and controlling the pulse pulp inlet pressure and the pulse pulp return pressure according to the control parameter requirements of the table 1, regulating and controlling the pulse pulp inlet pressure to be larger than or equal to the designed pulse pulp inlet pressure through a pulp inlet pressure regulating and controlling device 100, and regulating and controlling the pulse pulp return pressure to be equal to the designed pulse pulp return pressure through a pulp return pressure regulating and controlling device 90; starting the geological drilling machine 10 to sequentially perform drilling and grouting integrated impact extrusion grouting on the grouting hole section from top to bottom under the condition of double pressure control;
(8) The drilling rotation speed is controlled to be 50-100 r/min, the drilling and irrigation speed is controlled to be less than or equal to 10cm/min, and the drilling and irrigation feeding pressure is controlled by adopting medium pressure and matching with the drilling and irrigation speed requirement;
(9) After the drilling of each drilling and grouting section is finished, the in-section up-down rotary impact extrusion grouting is continued, and drilling and grouting control is carried out according to the determined drilling and grouting section control technical parameters, wherein the control standard is as follows: the drilling and grouting section impact extrusion grouting reaches the pulse pulp inlet pressure and the pulse pulp return pressure which are specified by the design, meets the injection rate ending standard, can end the drilling and grouting section impact extrusion grouting, and continues the drilling and grouting of the next drilling and grouting section;
(10) After drilling and grouting are finished in an integral impact extrusion grouting mode under the condition of full-hole-section double-pressure control, 0.5: and 1, carrying out full-hole Duan Jixie backfill grouting on the cement thick slurry.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The dual pressure control impact extrusion grouting system comprises a geological drilling machine (10), a slurry storage stirring barrel (20) and a pulse grouting pump (30), wherein a hollow round vertical shaft drill rod (11) is arranged on the geological drilling machine (10), a drilling machine faucet (12) is arranged at the upper end of the round vertical shaft drill rod (11), the lower end of the round vertical shaft drill rod (11) is connected with an impact extrusion grouting machine tool (40), the slurry storage stirring barrel (20) is communicated with the pulse grouting pump (30) through a slurry suction pipe, the outlet of the pulse grouting pump (30) is communicated with a drilling grouting pipe (50), the drilling grouting pipe (50) is communicated with the drilling machine faucet (12), an orifice sleeve (60) is arranged in an orifice of a stratum drilling hole, the impact extrusion grouting machine tool (40) penetrates through the orifice sleeve (60) to the stratum to be drilled, the drilling machine faucet (12), the round vertical shaft drill rod (11) and an inner cavity of the impact extrusion grouting machine tool (40) are communicated with each other to form slurry, the dual pressure control impact extrusion grouting system is characterized in that the orifice sleeve (70) is further connected with the orifice sleeve (70) at the upper end of the orifice sleeve, an orifice sealer slurry return interface (75) communicated with the inner cavity of the orifice sleeve (60) is arranged on the orifice sealer (70), a slurry return pressure regulating device (90) is arranged at the orifice sealer slurry return interface (75), and a slurry inlet pressure regulating device (100) is connected to the drilling and grouting slurry pipe (50);
The slurry inlet pressure regulating and controlling device (100) comprises a three-way pipe (101), a slurry inlet pressure control gate valve (102) and a slurry inlet pressure gauge (103), one interface of the three-way pipe (101) is communicated with a slurry outlet of the pulse grouting pump (30), the other two interfaces of the three-way pipe (101) are respectively communicated with the slurry inlet pressure gauge (103) and the slurry inlet pressure control gate valve (102), the slurry inlet pressure gauge (103) is arranged between the drilling grouting slurry inlet pipe (50) and the slurry inlet pressure control gate valve (102), and the outlet end of the slurry inlet pressure control gate valve (102) is communicated with the slurry storage stirring barrel (20) through a slurry return pipe;
The back-slurry pressure regulating device (90) comprises a back-slurry pressure control gate valve (91) and a back-slurry pressure gauge (92), the back-slurry pressure gauge (92) is arranged between the orifice sealer back-slurry interface (75) and the back-slurry pressure control gate valve (91), and the outlet end of the back-slurry pressure control gate valve (91) is connected with a drilling and grouting back-slurry pipe (80);
The double-pressure control impact extrusion grouting system further comprises a slurry returning and sand removing device (110), the slurry returning and sand removing device (110) comprises a sand removing vibrating screen (111), the sand removing vibrating screen (111) is arranged at the tail end of the drilling and grouting slurry returning pipe (80), a slurry conveying pump (112) is connected to a lower stirring barrel of the sand removing vibrating screen (111), and an outlet end of the slurry conveying pump (112) is communicated with the slurry storing stirring barrel (20) through a slurry returning and conveying pipe.
2. The dual pressure control impact extrusion grouting system as claimed in claim 1, wherein the orifice sealer (70) comprises an outer sealing sleeve (71), an upper lock sleeve (72) is connected with the upper end of the outer sealing sleeve (71) in a threaded manner, a three-way lock sleeve (73) is connected with the lower end of the outer sealing sleeve (71) in a threaded manner, an elastic sealing sleeve (74) is arranged inside the outer sealing sleeve (71), the upper end of the elastic sealing sleeve (74) is embedded between the outer sealing sleeve (71) and the upper lock sleeve (72) and is connected with the upper lock sleeve (72) in a threaded manner, the lower end of the elastic sealing sleeve (74) is embedded between the outer sealing sleeve (71) and the three-way lock sleeve (73) in a threaded manner, a slurry returning interface (75) of the orifice sealer is arranged on the three-way lock sleeve (73) and is communicated with an inner cavity of the three-way lock sleeve (73), a liquid filling cavity (76) is formed between the outer sealing sleeve (71) and the elastic sealing sleeve (74), and the liquid filling pump (77) is connected with the liquid filling pump (78) through the outer sealing sleeve (71).
3. The dual pressure control impact extrusion grouting system as recited in claim 1, wherein a filter screen (120) for filtering the slurry conveyed in the slurry returning and conveying pipe is installed at a connection part of the slurry returning and conveying pipe and the slurry storage stirring barrel (20).
4. The dual pressure control impact extrusion grouting system as claimed in claim 1, wherein the impact extrusion grouting machine (40) comprises a geological drill stem (41), the upper end of the geological drill stem (41) is connected with the round vertical shaft drill stem (11), the lower end of the geological drill stem (41) is connected with a drilling tool (42), a full-section drill bit (43) is arranged at the lower part of the drilling tool (42), and the diameter of the geological drill stem (41) is less than or equal to 91mm.
5. The dual pressure controlled impact grouting system of claim 1, wherein the depth of the orifice sleeve (60) disposed below the ground is not less than 1.5m, and the height of the orifice sleeve (60) exposed above the ground is not more than 0.1m.
6. The dual pressure controlled impact extrusion grouting system as recited in claim 1, further comprising a pulping barrel (130), the pulping barrel (130) being in communication with the pulp storage agitator (20) through a pulping delivery pipe.
7. A dual pressure control impact extrusion grouting construction method, characterized in that the dual pressure control impact extrusion grouting system as claimed in any one of claims 1-6 is adopted for impact extrusion grouting, and the construction method comprises the following steps:
S1: a double-pressure control impact extrusion grouting system is arranged at the position where impact extrusion grouting operation is to be implemented;
S2: determining drilling and grouting section control through field test according to stratum conditions and engineering requirements of to-be-performed impact extrusion grouting operation
Technical parameters including drilling and grouting section length, pulse slurry inlet pressure, pulse slurry return pressure and injection rate ending standard;
S3: according to the requirement of the sealing fit length of the round vertical shaft drill rod (11) and the orifice sealer (70) in the drilling and grouting process of each drilling and grouting section, the total length of the impact extrusion grouting machine tool (40) is configured, and the impact extrusion grouting machine tool (40) is sequentially connected with the grouting hole in a descending manner;
S4: stirring grout according to grouting grout configuration requirements, starting a pulse grouting pump (30), regulating and controlling pulse grouting pressure to be larger than or equal to design pulse grouting pressure through a grouting pressure regulating and controlling device (100), regulating and controlling pulse grouting pressure to be equal to design pulse grouting pressure through a grouting pressure regulating and controlling device (90), and starting a geological drilling machine (10) to sequentially perform drilling and grouting integrated impact extrusion grouting on grouting hole sections from top to bottom under the condition of double pressure control;
S5: and (3) continuously performing in-section up-down rotary impact extrusion grouting after drilling of each drilling and grouting section is completed, and performing drilling and grouting control according to the determined drilling and grouting section control technical parameters, wherein the control standard is as follows: the drilling and grouting section impact extrusion grouting reaches the pulse pulp inlet pressure and the pulse pulp return pressure which are specified by the design, meets the injection rate ending standard, can end the drilling and grouting section impact extrusion grouting, and continues the drilling and grouting of the next drilling and grouting section;
s6: and (3) after the drilling and grouting integrated impact extrusion grouting is finished under the condition of full-hole section double-pressure control, full-hole Duan Jixie backfilling grouting is carried out.
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