CN114703839A - Deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method - Google Patents
Deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method Download PDFInfo
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- CN114703839A CN114703839A CN202210289757.1A CN202210289757A CN114703839A CN 114703839 A CN114703839 A CN 114703839A CN 202210289757 A CN202210289757 A CN 202210289757A CN 114703839 A CN114703839 A CN 114703839A
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- 238000010276 construction Methods 0.000 title claims abstract description 89
- 238000005507 spraying Methods 0.000 title claims abstract description 45
- 238000005553 drilling Methods 0.000 title claims abstract description 36
- 239000004575 stone Substances 0.000 title claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 110
- 238000000034 method Methods 0.000 claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 35
- 239000007921 spray Substances 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000003116 impacting effect Effects 0.000 claims description 10
- 238000004537 pulping Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- 239000011440 grout Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 239000002689 soil Substances 0.000 description 14
- 239000000428 dust Substances 0.000 description 10
- 239000011435 rock Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000581613 Alchemilla arvensis Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of pile-forming construction, and discloses a deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method, which comprises the following construction steps: 1) leveling the construction site; 2) arranging an integrated machine; the integrated machine comprises a frame, wherein the frame is provided with a power head, a gas slurry conveying joint and a drill rod, and the lower part of the drill rod is provided with a down-the-hole impact head; the lower part of the drill rod is provided with a nozzle; 3) in the process that the power head drives the drill rod to drill the guide hole to the designed height of the pile bottom, the down-the-hole hammer air compressor drives the down-the-hole impact head to impact and drill, the rotary jet air compressor rotationally jets high-pressure gas in the pile hole through the nozzle, and the high-pressure grouting pump rotationally jets grout in the pile hole through the nozzle; 4) and in the process that the power head drives the drill rod to lift in the pile hole, the rotary spraying air compressor rotationally sprays high-pressure gas in the pile hole through the nozzle, and the high-pressure grouting pump rotationally sprays slurry in the pile hole through the nozzle until the slurry reaches the design reinforcement height of the pile top, so that the cement-soil-stone mixed pile with higher strength is formed, and the pile forming effect is good.
Description
Technical Field
The invention relates to the technical field of pile-forming construction, in particular to a pile-forming construction method integrating deep and thick stone-filled layer down-the-hole hammer guiding and rotary spraying drilling and spraying.
Background
The high-pressure rotary jet grouting method is characterized in that high-pressure rotary jet grouting foundation treatment and reinforcement are carried out in a deep rock-fill layer, a down-the-hole hammer is generally adopted to pre-guide holes in the rock-fill layer, a pile casing is put into the deep rock-fill layer to carry out wall protection, and then drilling and high-pressure jet grouting are carried out on a lower stratum.
In the prior art, the construction efficiency is low due to the fact that a hole leading procedure and a pile casing procedure are added in the whole construction process, meanwhile, due to the fact that gaps among filling stones in a filling stone layer are large, when slurry is sprayed in a rotary mode, slurry is prone to loss from the gaps among the filling stones, the grouting range is difficult to control, and pile forming quality is poor.
In addition, when a down-the-hole hammer is adopted for guiding hole drilling in a rock filling layer, a large amount of dust is generated when drilling slag is sprayed out from an orifice of a pile hole by high wind pressure, and the effect of sprinkling water to the orifice by manpower is poor, so that the civilized conditions of field construction are severe.
Disclosure of Invention
The invention aims to provide a construction method for forming a pile by integrating down-the-hole hammer pilot hole and rotary jet drilling and spraying of a deep and thick stone filling layer, and aims to solve the problem of poor pile forming effect in pile forming construction in the deep and thick stone filling layer in the prior art.
The invention is realized in this way, the deep rock-fill layer down-the-hole hammer pilot hole and rotary jet drilling and spraying integrated pile-forming construction method, including the following construction steps:
1) leveling a construction site, and determining a construction pile position; carrying out a pile test in a construction site, and determining that the conditions of the construction site meet various process parameters of construction;
2) arranging an integrated machine on a construction site; the all-in-one machine comprises a rack, wherein a power head, a gas slurry conveying joint and a drill rod are arranged on the rack, the lower part of the drill rod is connected with a down-the-hole impactor, and the down-the-hole impactor is provided with a down-the-hole impacting head; the air slurry conveying joint is connected with a rotary jet air compressor, a down-the-hole hammer air compressor and a high-pressure grouting pump, and a nozzle is arranged on the lower part of the drill rod;
3) in the process that the power head drives the drill rod to drill the guide hole to the designed elevation of the pile bottom, the down-the-hole hammer air compressor drives the down-the-hole impact head to drill in an impacting mode, the rotary jet air compressor sprays high-pressure gas in the pile hole in a rotary mode through the nozzle, and the high-pressure grouting pump sprays slurry in the pile hole in a rotary mode through the nozzle;
4) the power head drives the drill rod to lift in the pile hole, the rotary spraying air compressor sprays high-pressure gas in the pile hole through the nozzle in a rotary mode, and the high-pressure grouting pump sprays slurry in the pile hole through the nozzle in a rotary mode until the slurry reaches the design reinforcement height of the pile top.
Furthermore, a rotary air injection pipe, a down-the-hole hammer air pipe and a rotary slurry injection pipe are arranged inside the drill rod, and the air slurry conveying joint is provided with a first air inlet, a second air inlet and a slurry inlet; the first air inlet is communicated with a rotary jet pipe, the second air inlet is communicated with a down-the-hole hammer pipe, and the slurry inlet is communicated with the rotary jet pipe; the first air inlet is communicated with a rotary jet air compressor, the second air inlet is communicated with a down-the-hole hammer air compressor, and the slurry inlet is communicated with a high-pressure grouting pump;
in the step 3), the down-the-hole hammer air compressor conveys high-pressure gas through a second air inlet and a down-the-hole hammer air pipe to drive a down-the-hole hammer impact head to drill in an impacting manner; in construction step 3) and construction step 4), the jet grouting air compressor machine carries high-pressure gas to the nozzle through first air inlet and jet grouting pipe, the high-pressure grouting pump passes through thick liquid import and jet grouting pipe soon, carries the thick liquid to the nozzle.
Further, the nozzle comprises an inner nozzle communicated with the rotary slurry spraying pipe and an outer nozzle communicated with the rotary gas spraying pipe, and the inner nozzle and the outer nozzle are communicated in a gathering mode.
Further, in the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe and the slurry sprayed by the rotary jet pipe are gathered at the nozzle and are simultaneously sprayed outwards through the nozzle.
Furthermore, the inner nozzle is sunken in the drill rod, the drill rod is provided with a mounting hole, and the outer nozzle is mounted on the mounting hole and exposed outside the drill rod; the end part of the outer nozzle facing the inner nozzle is recessed inwards to form a collecting cavity, and the collecting cavity is respectively communicated with the inner nozzle and the rotary air injection pipe;
in the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe and the slurry sprayed by the rotary jet pipe are gathered and mixed in the collecting cavity and are sprayed outwards through the nozzle.
Further, the rotary jet air compressor is communicated with a down-the-hole hammer air pipe through a three-way valve, and in the construction step 4), in the process that the drill rod is lifted in the pile hole, the rotary jet air compressor transmits high-pressure air to the down-the-hole hammer air pipe so as to offset the slurry return pressure when the slurry flows back into the down-the-hole hammer.
Further, the first air inlet is communicated with a rotary jet air compressor through a first air pipeline, the second air inlet is communicated with a down-the-hole hammer air compressor through a second air pipeline, and the slurry inlet is communicated with a high-pressure grouting pump through a slurry pipeline; the all-in-one machine is electrically connected with a power supply through a wire;
in the construction step 2), the first air pipeline, the second air pipeline, the slurry pipeline and the electric wire are bound and fixed through a binding rope.
Further, in the construction step 2), the gas slurry conveying joint is fixed on the integrated machine, and then the first gas pipeline, the second gas pipeline, the slurry pipeline and the electric wire are bound and fixed; connecting the first gas pipeline with a first gas inlet, connecting the second gas pipeline with a second gas inlet, and connecting the slurry pipeline with a slurry inlet; and connecting the drill rod to the bottom of the gas slurry conveying joint.
Further, in the construction step 4), after the rotary spraying operation of the single pile body is finished, the drill rod is lifted out of the pile hole, clean water is input into the rotary spraying pipe from the high-pressure grouting pump at low pressure, low-pressure water jetting is carried out through the nozzle, and the drill rod and the nozzle are cleaned.
Further, preparing the slurry by adopting the full-process automatic control of a pulping machine, adding equal amount of cement and equal amount of water into the upper part of a stirring cylinder of the pulping machine, uniformly stirring and filtering a mixture of the cement and the water to form the slurry, and discharging the slurry into a slurry storage pool for later use; in the pile-forming construction process, the slurry in the slurry storage tank is continuously stirred by using a stirrer.
Compared with the prior art, the down-the-hole hammer leading hole and rotary spray drilling and spraying integrated pile forming construction method for the deep and thick stone filling layer organically combines the down-the-hole hammer impact leading hole process and the high-pressure rotary spray process, when drilling leading holes, high-pressure air drives the down-the-hole hammer to break stones and form holes to reach the designed elevation of the pile bottom, and meanwhile, a nozzle sprays slurry and high-pressure air to fill stratum gaps in the stone layer in advance and avoid dust pollution caused by drilling of the down-the-hole hammer; when the drill rod is lifted, the slurry and the high-pressure gas cut the soil body and are fully mixed with the soil body to form the cement soil-stone mixed pile with higher strength, the pile forming effect is good, the effects of reliable quality, high efficiency, economy, civilization and environmental protection are achieved, and the remarkable social and economic benefits are obtained.
Drawings
FIG. 1 is a schematic flow chart of a construction method for forming a pile by integrating down-the-hole hammer drilling and jet grouting for a deep and thick rock-fill layer provided by the invention;
FIG. 2 is an internal schematic view of a drill pipe pilot drilling process provided by the present invention;
FIG. 3 is an internal schematic view of the pipe lifting process provided by the present invention;
FIG. 4 is a partial schematic view of a drill pipe pilot drilling process provided by the present invention;
FIG. 5 is a partial schematic view of a drill pipe lifting process provided by the present invention;
FIG. 6 is a partial schematic view of a gas slurry delivery sub provided by the present invention in connection with a drill pipe;
FIG. 7 is a schematic perspective view of a pulping system provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-7, preferred embodiments of the present invention are provided.
The deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method comprises the following construction steps:
1) leveling a construction site, and determining a construction pile position; carrying out a pile test in a construction site, and determining that the conditions of the construction site meet various process parameters of construction;
2) arranging the integrated machine 200 on a construction site; the integrated machine 200 comprises a frame, wherein a power head, a gas slurry conveying connector 400 and a drill rod 201 are arranged on the frame, the lower part of the drill rod 201 is connected with a down-the-hole impactor 202, and the down-the-hole impactor 202 is provided with a down-the-hole impacting head; the air slurry conveying joint 400 is connected with a rotary jet air compressor 101, a down-the-hole hammer air compressor 102 and a high-pressure grouting pump 100, and a nozzle is arranged on the lower part of the drill rod 201;
the power head is used as a power element and is used for driving the drill rod 201 to rotate, and the down-the-hole hammer air compressor 102 conveys high-pressure gas to drive the down-the-hole hammer impact head to impact downwards;
3) in the process that the power head drives the drill rod 201 to drill the guide hole to the designed elevation of the pile bottom, the down-the-hole hammer air compressor 102 drives the down-the-hole impact head to drill in an impacting mode, the rotary spraying air compressor 101 sprays high-pressure gas in the pile hole in a rotary mode through the nozzle, and the high-pressure grouting pump 100 sprays grout in the pile hole in a rotary mode through the nozzle;
4) in the process that the power head drives the drill rod 201 to lift in the pile hole, the rotary spraying air compressor 101 is used for rotary spraying high-pressure air in the pile hole through the nozzle, and the high-pressure grouting pump 100 is used for rotary spraying grout in the pile hole through the nozzle until the grout reaches the designed reinforcement height of the pile top.
According to the construction method for the deep and thick stone-filled layer down-the-hole hammer leading hole and rotary jet drilling and spraying integrated pile forming, the down-the-hole hammer impact leading hole process and the high-pressure rotary jet process are organically combined, when the leading hole is drilled, high-pressure air drives the down-the-hole hammer to break the stone and form the hole to the designed elevation of the pile bottom, and meanwhile, the nozzles spray slurry and high-pressure air to fill the stratum gap in the stone layer 300 in advance and avoid dust pollution caused by drilling of the down-the-hole hammer; when the drill rod 201 is lifted, the slurry and the high-pressure gas cut the soil body and are fully mixed with the soil body to form the cement soil-stone mixed pile with higher strength, the pile forming effect is good, the effects of reliable quality, high efficiency, economy, civilization and environmental protection are achieved, and remarkable social and economic benefits are obtained.
The application range of the deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method is as follows:
1) the method is suitable for treating the rotary jet grouting pile foundation of deep and thick miscellaneous filling, a stone filling layer 300, gravel soil, weathered rock and other strata;
2) the method is suitable for treating the foundation with the pile diameter of the jet grouting pile being not more than 750 mm;
3) the method is suitable for treating the rotary spraying foundation with the treatment depth not greater than 20 m;
in the construction step 1), obstacles influencing construction in a construction site are cleared, the machine is ensured to have enough operation space, a control point of construction is measured by a total station before construction, and marking is carried out, so that the deviation of the center of a pile hole is ensured to be less than 50 mm.
In the pile test, eight pile test tests can be performed in advance to determine the cement mixing amount, the mixing proportion of cement slurry, the specific gravity of the cement slurry, the pressure value and the airflow pressure of high-pressure cement slurry pump slurry, the lifting speed of the drill rod 201, the rotation speed and other process parameters which are suitable for the site conditions and meet the design strength requirements. And after the test piles are completed and maintained for twenty-eight days, carrying out rotary spraying composite foundation excavation, carrying out appearance inspection, and respectively carrying out a pressing plate static load test on the single pile and the composite foundation.
The all-in-one machine 200 adopts a hydraulic walking type walking design, can walk and rotate by itself, is provided with a hydraulic supporting jacking force structure which is vertically and uniformly adjusted front and back, and has accurate alignment and high stability; the total height of the frame is 26m, and the maximum drilling depth can reach 22 m.
In this embodiment, a rotary jet pipe 1012, a down-the-hole hammer pipe 1022 and a rotary jet pipe 1002 are arranged inside the drill rod 201, and the air slurry conveying joint 400 is provided with a first air inlet 402, a second air inlet 403 and a slurry inlet 401; the first air inlet 402 is communicated with a rotary jet pipe 1012, the second air inlet 403 is communicated with a down-the-hole hammer pipe 1022, and the slurry inlet 401 is communicated with a rotary jet pipe 1002; the first air inlet 402 is communicated with the rotary jet air compressor 101, the second air inlet 403 is communicated with the down-the-hole hammer air compressor 102, and the slurry inlet 401 is communicated with the high-pressure grouting pump 100;
in the step 3), the down-the-hole hammer air compressor 102 transmits high-pressure gas through the second air inlet 403 and the down-the-hole hammer air pipe 1022 to drive the down-the-hole hammer impact head to drill in an impacting manner; in the construction steps 3) and 4), the rotary jetting air compressor 101 delivers high-pressure air to the nozzles through the first air inlet 402 and the rotary jetting pipe 1012, and the high-pressure grouting pump 100 delivers grout to the nozzles through the grout inlet 401 and the rotary jetting pipe 1002.
The down-the-hole hammer takes compressed air as power, the compressed air is provided by a down-the-hole hammer air compressor 102 and enters a down-the-hole hammer impactor through a drill rod 201 to push an impact head of the down-the-hole hammer to work, the aim of breaking rock is achieved by utilizing the reciprocating impact action of the impact head of the down-the-hole hammer, and the rock breaking and filling pilot hole effect is good due to high impact frequency and low stroke.
When the pilot hole is drilled, pilot hole guniting is carried out on the stone-filled layer 300 in advance, so that the stratum gap of the stone-filled layer 300 is filled, the subsequent diffusion loss of high-pressure rotary guniting body is reduced, and the subsequent grouting pile-forming quality is ensured; in addition, the dust sprayed upwards along the pile hole by the down-the-hole hammer is captured by spraying slurry, and the dust is blocked in the pile hole, so that the dust falling effect is achieved, and the dust pollution is prevented.
The nozzle jets out two media of high-pressure slurry and air simultaneously to impact and destroy the soil body, and under the combined action of the high-pressure slurry and the high-pressure air, the energy for destroying the soil body is obviously increased, and finally a larger consolidation body is formed in the soil.
The nozzle rotates, lifts and sprays the slurry at a certain speed until the designed elevation of the pile top.
For the silty clay bearing layer, secondary cutting and stirring are carried out on the soil body by the slurry sprayed by the nozzle and the high-pressure gas, so that soil body particles and the slurry are fully mixed;
for the rock-filled layer 300, the slurry is extruded to the periphery along the rock-filled gap, and the formation gap around the drill rod 201 is further filled, so that a pile body with a large diameter, uniform mixing and high strength is finally formed.
In this embodiment, the nozzles include an inner nozzle 501 communicating with the rotary jet grouting pipe and an outer nozzle 500 communicating with the rotary jet grouting pipe 1012, and the inner nozzle 501 and the outer nozzle 500 are collectively communicated.
In the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe 1012 and the slurry sprayed by the rotary jet pipe 1002 are converged at the nozzle and are simultaneously sprayed outwards through the nozzle.
The inner nozzle 501 is sunken in the drill rod 201, a mounting hole is formed in the drill rod 201, and the outer nozzle 500 is mounted on the mounting hole and exposed out of the drill rod 201; the end part of the outer nozzle 500 facing the inner nozzle 501 is recessed to form a collecting cavity which is respectively communicated with the inner nozzle 501 and the rotary air injection pipe 1012;
in the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe 1012 and the slurry sprayed by the rotary jet pipe 1002 are gathered and mixed in the collecting cavity, and are simultaneously sprayed outwards through the nozzles.
High-pressure air passes through the rotary air injection pipe 1012, slurry passes through the rotary slurry injection pipe 1002, and is simultaneously sprayed in a rotary mode after the nozzles are converged, so that formation gaps can be effectively filled, and soil bodies can be cut and uniformly mixed.
The rotary jet air compressor 101 is communicated with the down-the-hole hammer air pipe 1022 through the three-way valve 103, and in the construction step 4), in the process that the drill stem 201 is lifted in the pile hole, the rotary jet air compressor 101 transmits high-pressure air to the down-the-hole hammer air pipe 1022 to counteract the slurry return pressure when the slurry flows back into the down-the-hole hammer. In this way, in the process of lifting the drill rod 201, the down-the-hole hammer air compressor 102 does not need to be started, and only the jet grouting air compressor 101 and the high-pressure grouting pump 100 need to be started.
In this embodiment, the first air inlet 402 is communicated with the rotary jet air compressor 101 through a first air pipeline 1011, the second air inlet 403 is communicated with the down-the-hole hammer air compressor 102 through a second air pipeline 1021, and the slurry inlet 401 is communicated with the high-pressure grouting pump 100 through a slurry pipeline 1001; the integrated machine 200 is electrically connected with a power supply through a wire; in the construction step 2), the first air pipe 1011, the second air pipe 1021, the slurry pipe 1001 and the electric wire are bound and fixed by a binding rope.
The first air pipe 1011, the second air pipe 1021, the slurry pipe 1001 and the electric wire are integrally designed, and are bound and fixed by the binding rope, so that the integrated transmission of the gas, the slurry and the electric wire is realized.
In the construction step 2), the gas slurry conveying connector 400 is fixed on the integrated machine 200, and then the first gas pipeline 1011, the second gas pipeline 1021, the slurry pipeline 1001 and the electric wire are bound and fixed; then connecting the first air pipe 1011 with the first air inlet 402, connecting the second air pipe 1021 with the second air inlet 403, and connecting the slurry pipe 1001 with the slurry inlet 401; the drill pipe 201 is then connected to the bottom of the gas slurry delivery sub 400.
In the construction step 4), after the rotary spraying operation of a single pile body is finished, the drill rod 201 is lifted out of the pile hole, clean water is input into the rotary spraying pipe 1002 by the high-pressure grouting pump 100 at low pressure, low-pressure water injection is carried out through the nozzle, and the drill rod 201 and the nozzle are cleaned. After the drill rod 201 is cleaned, the integrated machine 200 releases the hydraulic supporting jacking force and moves to a new hole position by using the walking.
The slurry is prepared by adopting the full-process automatic control of the pulping machine, the equal amount of cement and the equal amount of water are added into the upper part of a stirring cylinder 600 of the pulping machine, the mixture of the cement and the water is uniformly stirred and filtered to form the slurry, and the slurry is discharged into a slurry storage tank 601 for later use. In the pile-forming construction process, the slurry in the slurry storage tank 601 is continuously stirred by a stirrer.
The deep rock-fill layer down-the-hole hammer leading hole and rotary spray drilling and spraying integrated pile-forming construction method provided by the embodiment has the following advantages:
1) high construction efficiency
The down-the-hole hammer is used for impacting the leading hole and organically combining with high-pressure rotary jet grouting, so that the leading hole drilling and the jet grouting integration of the deep stone-filled layer is realized, one set of equipment is used for completing the operation of the whole construction process, no connecting pipe or pipe dismounting is needed in the whole construction process, the pile is formed at one time, the operation is convenient and fast, the process is reduced by half, and the work efficiency is improved by more than one time;
2) the pile forming quality is good
High-pressure injection of slurry is adopted in the drilling and lifting processes, and high-pressure slurry injection is performed synchronously during drilling of a pilot hole, so that gaps in the stone layer 300 are effectively filled, and cement slurry loss during subsequent rotary jet grouting is avoided; when the drilling and jet grouting are carried out, the grout is mixed with the surrounding soil body through secondary high pressure, and the diameter of the pile is further enlarged through cutting, extruding and permeating, so that a cement soil consolidation body with larger pile diameter and better uniformity is formed, and the quality of the jet grouting pile is ensured;
3) saving the construction cost
The foundation is reinforced, the grout can be fully filled into foundation soil, the utilization rate of the grout is higher than that of the conventional rotary spraying process, the grout return amount is effectively controlled, and the cement consumption can be obviously reduced; meanwhile, the cement slurry is fully automatically proportioned, fed, stirred and conveyed, so that the waste of cement is reduced, and the manufacturing cost is totally saved;
4) environment protection and no pollution
When the down-the-hole hammer is adopted to drill the pilot hole, the slurry synchronously sprayed out by the nozzles can quickly moisten and reduce dust, thereby effectively controlling the dust pollution in the down-the-hole hammer pilot hole process and realizing green, environment-friendly and pollution-free drilling process; meanwhile, the full-automatic pulping machine adopts an integrated design, and no dust pollution is caused in the pulping process; in addition, in the construction process, the discharge of waste cement paste is effectively reduced, and the secondary pollution influence on the surrounding environment is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method is characterized by comprising the following construction steps of:
1) leveling a construction site, and determining a construction pile position; carrying out a pile test in a construction site, and determining that the conditions of the construction site meet various process parameters of construction;
2) arranging an integrated machine on a construction site; the all-in-one machine comprises a rack, wherein a power head, a gas slurry conveying joint and a drill rod are arranged on the rack, the lower part of the drill rod is connected with a down-the-hole impactor, and the down-the-hole impactor is provided with a down-the-hole impacting head; the air slurry conveying joint is connected with a rotary jet air compressor, a down-the-hole hammer air compressor and a high-pressure grouting pump, and a nozzle is arranged on the lower part of the drill rod;
3) in the process that the power head drives the drill rod to drill the guide hole to the designed elevation of the pile bottom, the down-the-hole hammer air compressor drives the down-the-hole impact head to drill in an impacting mode, the rotary jet air compressor sprays high-pressure gas in the pile hole in a rotary mode through the nozzle, and the high-pressure grouting pump sprays slurry in the pile hole in a rotary mode through the nozzle;
4) the power head drives the drill rod to lift in the pile hole, the rotary spraying air compressor sprays high-pressure gas in the pile hole through the nozzle in a rotary mode, and the high-pressure grouting pump sprays slurry in the pile hole through the nozzle in a rotary mode until the slurry reaches the design reinforcement height of the pile top.
2. The down-the-hole hammer leading hole and rotary jet drilling and spraying integrated pile-forming construction method for the deep rock-fill layer according to claim 1, wherein a rotary jet pipe, a down-the-hole hammer pipe and a rotary jet grouting pipe are arranged inside the drill rod, and the air slurry conveying joint is provided with a first air inlet, a second air inlet and a slurry inlet; the first air inlet is communicated with a rotary jet pipe, the second air inlet is communicated with a down-the-hole hammer pipe, and the slurry inlet is communicated with a rotary jet pipe; the first air inlet is communicated with a rotary jet air compressor, the second air inlet is communicated with a down-the-hole hammer air compressor, and the slurry inlet is communicated with a high-pressure grouting pump;
in the step 3), the down-the-hole hammer air compressor conveys high-pressure gas through a second air inlet and a down-the-hole hammer air pipe to drive a down-the-hole hammer impact head to drill in an impacting manner; in construction step 3) and construction step 4), the jet grouting air compressor machine carries high-pressure gas to the nozzle through first air inlet and jet grouting pipe, the high-pressure grouting pump passes through thick liquid import and jet grouting pipe soon, carries the thick liquid to the nozzle.
3. The method for pile-forming construction by integrating the down-the-hole hammer pilot hole and the rotary jet drilling and spraying of the deep rock-fill layer as claimed in claim 2, wherein the nozzles comprise an inner nozzle communicated with the rotary jet grouting pipe and an outer nozzle communicated with the rotary jet grouting pipe, and the inner nozzle is communicated with the outer nozzle in a gathering way.
4. The method for constructing the deep rock-fill layer down-the-hole hammer pilot hole and the rotary jet drilling and spraying integrated pile as claimed in claim 3, wherein in the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe and the slurry sprayed by the rotary jet grouting pipe are simultaneously sprayed outwards through the nozzles after the nozzles are converged.
5. The down-the-hole hammer leading hole and rotary jet drilling and spraying integrated pile-forming construction method for the deep rock-fill layer according to claim 4, wherein the inner nozzle is sunken inside a drill rod, the drill rod is provided with a mounting hole, and the outer nozzle is mounted on the mounting hole and exposed outside the drill rod; the end part of the outer nozzle facing the inner nozzle is recessed inwards to form a collecting cavity, and the collecting cavity is respectively communicated with the inner nozzle and the rotary air injection pipe;
in the construction step 3) and the construction step 4), the high-pressure gas sprayed by the rotary jet pipe and the slurry sprayed by the rotary jet pipe are gathered and mixed in the collecting cavity and are sprayed outwards through the nozzle.
6. The method for constructing a pile by integrating the down-the-hole hammer pilot hole and the rotary jet drilling and spraying in the deep rock-fill layer according to claim 2, wherein the rotary jet air compressor is communicated with the down-the-hole hammer air pipe through a three-way valve, and in the construction step 4), the rotary jet air compressor transmits high-pressure air to the down-the-hole hammer air pipe to counteract the slurry return pressure when slurry flows back into the down-the-hole hammer during the lifting process of the drill rod in the pile hole.
7. The deep rock-fill layer down-the-hole hammer pilot hole and rotary jet drilling and spraying integrated pile-forming construction method as claimed in claim 2, wherein the first air inlet is communicated with a rotary jet air compressor through a first air pipeline, the second air inlet is communicated with a down-the-hole hammer air compressor through a second air pipeline, and the slurry inlet is communicated with a high-pressure grouting pump through a slurry pipeline; the all-in-one machine is electrically connected with a power supply through a wire;
and in the construction step 2), the first air pipeline, the second air pipeline, the slurry pipeline and the electric wire are bound and fixed through a binding rope.
8. The deep rock-fill layer down-the-hole hammer leading hole and rotary jet drilling and spraying integrated pile-forming construction method as claimed in claim 7, wherein in the construction step 2), the air slurry conveying joint is fixed on the integrated machine, and then the first air pipeline, the second air pipeline, the slurry pipeline and the electric wire are bound and fixed; connecting the first air pipeline with a first air inlet, connecting the second air pipeline with a second air inlet, and connecting the slurry pipeline with a slurry inlet; and connecting the drill rod to the bottom of the gas slurry conveying joint.
9. The method for forming a pile by integrating the down-the-hole hammer pilot hole and the rotary jet drilling and spraying in the deep rock-fill layer according to claim 2, wherein in the step 4), after the rotary jet operation of the single pile body is finished, the drill rod is lifted out of the pile hole, the high-pressure grouting pump inputs clean water to the rotary jet grouting pipe at low pressure, low-pressure water injection is carried out through the nozzle, and the drill rod and the nozzle are cleaned.
10. The deep rock-fill layer down-the-hole hammer leading hole and rotary jet drilling and spraying integrated pile-forming construction method as claimed in claim 2, characterized in that slurry is prepared by adopting a pulping machine through full automatic control, the mixture of cement and water is uniformly stirred and filtered by adding equal amount of cement and equal amount of water into the upper part of a stirring cylinder of the pulping machine to form slurry, and the slurry is discharged into a slurry storage tank for standby; in the pile-forming construction process, the slurry in the slurry storage tank is continuously stirred by using a stirrer.
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| CN202210289757.1A CN114703839A (en) | 2022-03-23 | 2022-03-23 | Deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method |
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| CN202210289757.1A CN114703839A (en) | 2022-03-23 | 2022-03-23 | Deep stone-filled layer down-the-hole hammer leading hole and rotary spraying drilling and spraying integrated pile-forming construction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172667A (en) * | 1997-12-08 | 1999-06-29 | Onoda Chemico Co Ltd | High-pressure injection ground-improvement method |
| CN107338789A (en) * | 2016-12-28 | 2017-11-10 | 福建建工集团有限责任公司 | A kind of construction method of down-the-hole percussion triple-pipe high pressure jet grouting stake |
| CN206928295U (en) * | 2017-05-17 | 2018-01-26 | 北京荣创岩土工程股份有限公司 | Realize the injector of gas bag slurry |
| CN213233469U (en) * | 2020-08-26 | 2021-05-18 | 北京荣创岩土工程股份有限公司 | Triaxial down-the-hole impact high-pressure jet grouting equipment |
-
2022
- 2022-03-23 CN CN202210289757.1A patent/CN114703839A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172667A (en) * | 1997-12-08 | 1999-06-29 | Onoda Chemico Co Ltd | High-pressure injection ground-improvement method |
| CN107338789A (en) * | 2016-12-28 | 2017-11-10 | 福建建工集团有限责任公司 | A kind of construction method of down-the-hole percussion triple-pipe high pressure jet grouting stake |
| CN206928295U (en) * | 2017-05-17 | 2018-01-26 | 北京荣创岩土工程股份有限公司 | Realize the injector of gas bag slurry |
| CN213233469U (en) * | 2020-08-26 | 2021-05-18 | 北京荣创岩土工程股份有限公司 | Triaxial down-the-hole impact high-pressure jet grouting equipment |
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