CN114411758A - Foundation pit support multi-shaft pressure-grouting pile construction process based on solid waste utilization - Google Patents
Foundation pit support multi-shaft pressure-grouting pile construction process based on solid waste utilization Download PDFInfo
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- CN114411758A CN114411758A CN202210133303.5A CN202210133303A CN114411758A CN 114411758 A CN114411758 A CN 114411758A CN 202210133303 A CN202210133303 A CN 202210133303A CN 114411758 A CN114411758 A CN 114411758A
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002910 solid waste Substances 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 55
- 239000004568 cement Substances 0.000 claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000002002 slurry Substances 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003337 fertilizer Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 239000010440 gypsum Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004567 concrete Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D17/02—Foundation pits
-
- 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
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a construction process of a multi-shaft pressure grouting pile for foundation pit support based on solid waste utilization, which comprises the following steps of: measuring and paying off to determine pile positions; the multi-shaft pile press-filling machine is in place; forced mixer, proportioning machine and ground pump are debugged in place; preparing the cement soil slurry for stirring, and performing slump and fluidity tests; starting the multi-shaft pile press-filling machine to drill until the designed depth is reached, stopping drilling, pumping cement slurry, and lifting the drill rod until the drill rod reaches the orifice; inserting section steel; manufacturing a detachable crown beam; and after the supporting system finishes the function, backfilling the fertilizer tank by using cement-soil slurry in a segmented and layered manner, recovering the anchor head, the waist beam and the anchor rod by layers, and finally recovering the section steel, wherein after the section steel is pulled out, the cavity is filled with the cement-soil slurry. The invention utilizes the characteristic that the multi-shaft pile press-grouting machines are mutually occluded, not only can realize high efficiency of a plurality of piles at one time, but also can realize effective and reliable occlusion between the curtain piles, and ensure no water leakage, thereby better ensuring the water stopping effect of the foundation pit supporting curtain.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a foundation pit supporting multi-shaft pressure-grouting pile construction process based on solid waste utilization.
Background
At present, the resource utilization of solid wastes in China is more and more emphasized and more common in application, and with the implementation of the policy of encouraging the construction waste treatment, tailings of a construction waste treatment plant are gradually developed and utilized and are firstly processed into cement slurry to carry out the backfill of a construction fertilizer tank, the backfill of a municipal pipe gallery foundation tank, the backfill of a house center, the filling of an underground cavity and the like.
On one hand, however, on the other hand, most of the backfilling of the fertilizer grooves and the like adopts 2:8 lime soil or 3:7 lime soil, for a foundation pit with the depth of dozens of meters, the 2:8 lime soil or 3:7 lime soil is used for filling and tamping layer by layer, a row of reinforced concrete slope protection piles are independently made at the front row, reinforced concrete crown beams are arranged at the pile tops, 5 anchor rods are arranged, reinforcing mesh is woven among the piles for spraying concrete, the fertilizer grooves are backfilled with 2:8 lime soil, one rammer is arranged at 20cm layer by layer, 100 layers of rammers are required to be filled at 20m depth, the reinforced concrete piles and the anchor rods are permanently left underground to occupy underground space, the operation is complicated, and the quality cannot be guaranteed; on the other hand, the existing foundation pit supporting pile construction (for example, the patent number 200510082950.4 is an invention patent of a cement soil pile, the patent number 201210509644.4 is an invention patent named as a foundation pit supporting method of a cement soil type steel pile for manual hole digging, the patent number 201710870705.2 is an invention patent named as a construction method of a structural steel pressure-grouting cement soil curtain supporting pile, and the patent number 201710869952.0 is an invention patent named as a construction method of a rotary drilling hole-forming pressure-grouting cement soil occlusion curtain pile) adopts a single-shaft drilling tool for construction, so that the efficiency is low, only one pile can be formed at a time, the occlusion is not reliable when the curtain is made, and water leakage is easy.
Therefore, the technical personnel in the field need to solve the problem of providing an efficient foundation pit supporting multi-shaft pressure-grouting pile construction process based on solid waste utilization.
Disclosure of Invention
In view of the above, the invention provides a foundation pit supporting multi-shaft pressure grouting pile construction process based on solid waste utilization, so that geotechnical engineering construction is efficient, reliable and energy-saving.
In order to achieve the purpose, the invention adopts the following technical scheme:
a foundation pit supporting multi-shaft pressure grouting pile construction process based on solid waste utilization comprises the following steps:
1) measuring and paying off, and determining pile positions;
2) the multi-shaft pile press-filling machine is in place;
3) forced mixer, proportioning machine and ground pump are put in place and debugged, and a dustproof shed is set up;
4) preparing and stirring cement soil slurry: preparing cement soil slurry at a mixing station, transporting the cement soil slurry to the site by a tank truck or mixing the cement soil slurry with a forced mixer at a construction site; and testing slump and fluidity;
5) starting the multi-shaft pile press-filling machine to drill until the designed depth is reached, stopping drilling, pumping cement slurry, and lifting the drill rod until the drill rod reaches the orifice;
6) inserting the profile steel, firstly hoisting the profile steel by adopting a crane and lowering the profile steel by using the self weight of a resonance-free vibration hammer, and starting the vibration hammer to vibrate and lower the profile steel when resistance is met;
7) manufacturing a detachable crown beam;
8) and after the supporting system finishes the function, backfilling the fertilizer tank by using cement-soil slurry in a segmented and layered manner, recovering the anchor head, the waist beam and the anchor rod by layers, and finally recovering the section steel, wherein after the section steel is pulled out, the cavity is filled with the cement-soil slurry.
By adopting the scheme, the invention has the beneficial effects that:
the characteristic that the multi-shaft pile press-grouting machines are mutually occluded is utilized, so that the high efficiency of multiple piles at one time can be realized, the effective and reliable occlusion between the curtain piles can be realized, and the water tightness is ensured, thereby better ensuring the water stop effect of the foundation pit supporting curtain.
Furthermore, the multi-shaft pressure grouting pile machine is a double-shaft or three-shaft or five-shaft or nine-shaft machine.
Furthermore, adjacent helical blades on each drill rod of the multi-shaft pressure grouting pile machine are distributed at intervals, and the helical blades on the adjacent drill rods are distributed in a staggered mode.
The beneficial effect that adopts above-mentioned further technical scheme to produce does, influences each other when avoiding gyration.
Further, the formula for mixing the cement-soil slurry on the construction site is as follows: 50-90 parts of clay or silt, 10-50 parts of sandy soil, 10-15 parts of cement and 70-90 parts of water, wherein the slump is more than 200mm, the fluidity is more than 500mm, the initial setting time is 6-8 hours, the final setting time is 20-24 hours, and the 28-day test block compressive strength is 0.8-3.0 MPa; the formula for preparing the cement soil slurry in the mixing station comprises the following steps: 60-80 parts of construction waste tailings, 20-40 parts of curing agent and 70-90 parts of water, wherein the curing agent can be cement with fly ash and mineral powder or sulfur gypsum with fly ash, mineral powder and cement, the slump is greater than 200mm, the fluidity is greater than 500mm, the initial setting time is 6-8 hours, the final setting time is 16-20 hours, and the test block strength in 28 days is 0.8-3.0 MPa.
Further, in the step 8), the backfill layering number of the fertilizer grooves corresponds to the number of the anchor rod layers.
The beneficial effect that adopts above-mentioned further technical scheme to produce is, be convenient for demolish anchor head, steel waist rail and stock etc..
Therefore, the invention provides a foundation pit supporting multi-shaft pressure grouting pile construction process based on solid waste utilization, compared with the prior art, the process comprises the following steps:
1) the multi-shaft pile press-filling machine is utilized to achieve the effects of high efficiency and reliability;
2) solid wastes are fully utilized, products with high energy consumption and high carbon emission of steel bars and concrete are not used, energy is saved, emission is reduced, and the permanent occupation of an underground space caused by adding an unrecoverable anchor rod to a reinforced concrete pile is overcome;
3) the spray protection among the piles is cancelled, and the direct cost and the pollution during concrete spraying are reduced;
4) the crown beam, the steel waist beam, the anchor head and the profile steel are recycled to the maximum extent, so that the cyclic utilization is realized;
5) the vibration hammer ensures that the section steel is inserted to the designed depth, and underground pipelines of surrounding building structures and the like are not influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a process flow diagram of a foundation pit supporting multi-shaft pressure grouting pile construction process based on solid waste utilization provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Take a foundation pit with a depth of 20m and a perimeter of 1000m as an example:
as shown in fig. 1, the embodiment of the invention discloses a foundation pit support multi-shaft pressure grouting pile construction process based on solid waste utilization, which comprises the following steps:
1) measuring and paying off, and determining pile positions;
2) the multi-shaft pile press-filling machine is in place; in the embodiment, a five-shaft pressure filling pile machine is adopted for pressure filling cement soil slurry;
3) forced mixer, proportioning machine and ground pump are put in place and debugged, and a dustproof shed is set up;
4) preparing and stirring cement soil slurry: preparing cement soil slurry at a mixing station, transporting the cement soil slurry to the site by a tank truck or mixing the cement soil slurry with a forced mixer at a construction site; and testing slump and fluidity; in the embodiment, the field soil taking can be selected according to the situation of the field soil, and can be cohesive soil, silt, sandy soil and the like, the curing agent can be industrial waste such as cement or gypsum (sulfur gypsum, phosphogypsum) and the like, or the curing agent can be conveyed to the field by a tank truck after being stirred by a stirring station, and enters a pressure irrigation drilling machine through a ground pump pipe;
5) starting the multi-shaft pile press-filling machine to drill until the designed depth is reached, stopping drilling, pumping cement slurry, and lifting the drill rod until the drill rod reaches the orifice; in the embodiment, the upper part 6m is designed to be 1:0.3 for slope soil nailing wall support, the lower part 14m is provided with a five-shaft pile press-filling machine for press-filling cement soil slurry, the diameter is 800mm, the occlusion is 200mm, and the length of the cement soil pile is 19m
6) Inserting the profile steel, firstly hoisting the profile steel by adopting a crane and lowering the profile steel by using the self weight of a resonance-free vibration hammer, and starting the vibration hammer to vibrate and lower the profile steel when resistance is met; in the embodiment, the H-shaped steel with the length of 19m, the embedding depth of 5m and the steel section spacing of 1.4m is inserted into the separating piles, wherein the H-shaped steel with the length of 700 x 210 x 13 is inserted into the separating piles;
7) manufacturing a detachable crown beam; in this embodiment, the side of the crown beam near the pit is made of double 25b i-steel, the side of the back pit is made of a 20a channel steel, the site drilling is performed by bolts connected with the profile steel, an anchor rod is arranged on the crown beam, 4 anchor rods are distributed below the crown beam, the horizontal spacing of the anchor rods is 1.4m, the anchor rods are made of pressure dispersion type detachable anchor rods, the process of weaving reinforcing mesh and spraying concrete is cancelled among the piles, the vertical spacing is sequentially 5 anchor rods from the top of the crown beam to the bottom, and the sizes of the steel waist beam are double 25b (2 nd, 3 rd) and 28b (4 th, 5 th) i-steel;
8) after the supporting system finishes the function, the cement soil slurry is used for backfilling the fertilizer groove in a segmented and layered mode, the anchor head, the waist beam and the anchor rod are recovered in a layered mode, finally the section steel is recovered, after the section steel is pulled out, the cavity is filled with the cement soil slurry, in the embodiment, when the fertilizer groove is backfilled, the cement soil slurry is stirred on site, pumping is adopted, the cement soil slurry is used for backfilling in a segmented and layered mode, the backfilling is divided into 6 layers, each layer is stopped when the layer is filled to be 0.5-1.0 m below the steel waist beam of the anchor rod, after the section cement soil slurry is solidified, the anchor head, the steel waist beam and the anchor rod are removed, the cement soil slurry is continuously backfilled until the layer soil slurry is filled to be 1.0m below the crown beam, after the anchor head, the I-beam, the channel steel and the anchor rod are removed, the H-shaped steel is started to be pulled out, and the cavity cement soil slurry is finally filled until the upper portion of the ground surface is filled.
The invention utilizes the characteristic that the multi-shaft pile press-grouting machines are mutually occluded, not only can realize high efficiency of a plurality of piles at one time, but also can realize effective and reliable occlusion between the curtain piles, and ensure no water leakage, thereby better ensuring the water stopping effect of the foundation pit supporting curtain.
Specifically, adjacent helical blades on each drill rod of the multi-shaft pressure grouting pile machine are distributed at intervals, and the helical blades on the adjacent drill rods are distributed in a staggered mode. In this embodiment, press close to the outer pipe wall on even drilling tool and vertically have high-pressure injection thin steel pipe, high-pressure injection thin steel pipe front end has 2 high pressure nozzle, can compensate the not very reliable condition of pressure filling interlock through rotatory stirring injection function, concrete construction adopts "cover to beat the method", five pile machine constructions of pressure filling are pressed to five axles, every (1 preface stake) of beating promptly is five stakes promptly, then jump three, beat second (1 preface stake), then return and beat third (2 preface stakes) time respectively and repeatedly about.
Specifically, the formula for mixing the cement-soil slurry on the construction site is as follows: 50-90 parts of clay or silt, 10-50 parts of sandy soil, 10-15 parts of cement and 70-90 parts of water, wherein the slump is more than 200mm, the fluidity is more than 500mm, the initial setting time is 6-8 hours, the final setting time is 20-24 hours, and the 28-day test block compressive strength is 0.8-3.0 MPa; the formula for preparing the cement soil slurry in the mixing station comprises the following steps: 60-80 parts of construction waste tailings, 20-40 parts of curing agent and 70-90 parts of water, wherein the curing agent can be cement with fly ash and mineral powder or sulfur gypsum with fly ash, mineral powder and cement, the slump is greater than 200mm, the fluidity is greater than 500mm, the initial setting time is 6-8 hours, the final setting time is 16-20 hours, and the test block strength in 28 days is 0.8-3.0 MPa. In this embodiment, the cement-soil slurry is mixed at the construction site, and the formula is as follows: 75 parts of clay or silt, 25 parts of sandy soil, 10 parts of cement, 70 parts of water, more than 200mm of slump, more than 500mm of fluidity, 6 hours of initial setting time, 20 hours of final setting time and 0.8-1.2 MPa of test block strength in 28 days.
Specifically, in the step 8), the number of the backfill layers of the fertilizer groove corresponds to the number of the anchor rod layers, the layers are combined with the underground outdoor wall pasted waterproof protective benzene plate, and when the perimeter of the foundation pit is longer, the steps are performed in sections.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A foundation pit supporting multi-shaft pressure grouting pile construction process based on solid waste utilization is characterized by comprising the following steps:
1) measuring and paying off, and determining pile positions;
2) the multi-shaft pile press-filling machine is in place;
3) forced mixer, proportioning machine and ground pump are put in place and debugged, and a dustproof shed is set up;
4) preparing and stirring cement soil slurry: preparing cement soil slurry at a mixing station, transporting the cement soil slurry to the site by a tank truck or mixing the cement soil slurry with a forced mixer at a construction site; and testing slump and fluidity;
5) starting the multi-shaft pile press-filling machine to drill until the designed depth is reached, stopping drilling, pumping cement slurry, and lifting the drill rod until the drill rod reaches the orifice;
6) inserting the profile steel, firstly hoisting the profile steel by adopting a crane and lowering the profile steel by using the self weight of a resonance-free vibration hammer, and starting the vibration hammer to vibrate and lower the profile steel when resistance is met;
7) manufacturing a detachable crown beam;
8) and after the supporting system finishes the function, backfilling the fertilizer tank by using cement-soil slurry in a segmented and layered manner, recovering the anchor head, the waist beam and the anchor rod by layers, and finally recovering the section steel, wherein after the section steel is pulled out, the cavity is filled with the cement-soil slurry.
2. The construction process of the multi-shaft pressure grouting pile for the foundation pit support based on the solid waste utilization as claimed in claim 1, wherein the multi-shaft pressure grouting pile machine is a double shaft or a triple shaft or a five shaft or a nine shaft.
3. The construction process of the multi-shaft pressure filling pile for the foundation pit support based on the solid waste utilization as claimed in claim 2, wherein the adjacent helical blades on each drill rod of the multi-shaft pressure filling pile machine are distributed at intervals, and the helical blades on the adjacent drill rods are distributed in a staggered mode.
4. The foundation pit support multi-shaft pressure grouting pile construction process based on solid waste utilization according to claim 1, characterized in that the formula for mixing cement-soil slurry at a construction site is as follows: 50-90 parts of clay or silt, 10-50 parts of sandy soil, 10-15 parts of cement and 70-90 parts of water, wherein the slump is more than 200mm, the fluidity is more than 500mm, the initial setting time is 6-8 hours, the final setting time is 20-24 hours, and the 28-day test block compressive strength is 0.8-3.0 MPa; the formula for preparing the cement soil slurry in the mixing station comprises the following steps: 60-80 parts of construction waste tailings, 20-40 parts of curing agent and 70-90 parts of water, wherein the curing agent can be cement with fly ash and mineral powder or sulfur gypsum with fly ash, mineral powder and cement, the slump is greater than 200mm, the fluidity is greater than 500mm, the initial setting time is 6-8 hours, the final setting time is 16-20 hours, and the test block strength in 28 days is 0.8-3.0 MPa.
5. The foundation pit support multi-shaft pressure grouting pile construction process based on solid waste utilization according to claim 1, wherein in the step 8), the number of backfill layers of the fertilizer groove corresponds to the number of anchor rod layers.
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|---|---|---|---|---|
| CN115059070A (en) * | 2022-05-31 | 2022-09-16 | 北京建材地质工程有限公司 | Construction method of collapse-free stratum foundation pit supporting pile based on solid waste utilization |
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