CN112900419A - Slurry wall protection construction method - Google Patents
Slurry wall protection construction method Download PDFInfo
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- CN112900419A CN112900419A CN202110097951.5A CN202110097951A CN112900419A CN 112900419 A CN112900419 A CN 112900419A CN 202110097951 A CN202110097951 A CN 202110097951A CN 112900419 A CN112900419 A CN 112900419A
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- 239000002002 slurry Substances 0.000 title claims abstract description 178
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 89
- 239000000126 substance Substances 0.000 claims abstract description 87
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000013049 sediment Substances 0.000 claims abstract description 11
- 239000002689 soil Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- 230000001681 protective effect Effects 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 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
-
- 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
- E02D5/66—Mould-pipes or other moulds
-
- 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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a construction method of a slurry retaining wall, which comprises the following steps: firstly, embedding a pile casing on a pile position of a constructed rotary digging pile; placing a drill bit of a drilling machine in the pile casing, and enabling the drill bit to correspond to the central point of the pile position; injecting solution and chemical slurry powder with initial dosage into the protecting cylinder according to the initial dosage of the chemical slurry powder obtained by pre-calculation, and forming wall protecting slurry after rotating and stirring through a drill bit; adopting a drill bit to drill downwards to the designed hole depth to obtain a drilled hole, wherein when the drill bit descends 1 m downwards and reaches the preset designed depth, adding the average amount of chemical slurry powder into the retaining wall slurry according to the average amount of the chemical slurry powder calculated in advance, wherein the preset designed depth is smaller than the designed hole depth; after the preset standing time, a drill bit is adopted to salvage the sediment at the bottom of the hole, and the wall protection slurry in the drill hole is stood after the sediment removal is finished. The invention has high construction efficiency and low cost, and does not need to build a mud pit.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a slurry retaining wall construction method.
Background
With the rapid development of economy in China, the quantity of project foundation projects in China is rapidly increased, and the rotary drilling rig hole forming technology is widely applied in the fields of buildings, subway traffic and bridges, and is particularly most common in cast-in-place pile construction. The existing rotary excavating cast-in-place pile technology mostly adopts a mud pit to make slurry and protect walls, not only occupies a construction site, but also needs to start slurry making in advance for a long time, and has great influence on construction site conditions and construction period.
Disclosure of Invention
The invention aims to provide a construction method of a mud retaining wall, which has high construction efficiency and low cost and does not need to build a mud pool.
The invention is realized by the following technical scheme:
a method for constructing a mud retaining wall comprises the following steps:
step 1, embedding a pile casing: firstly, measuring and setting out the pile position of the constructed rotary-digging pile, and then embedding a pile casing on the pile position obtained by measuring and setting out;
step 3, initial slurry making: injecting a solution and adding the chemical slurry powder with the initial dosage into the protective cylinder according to the initial dosage of the chemical slurry powder obtained by pre-calculation, and forming wall protection slurry after rotating and stirring through a drill bit, wherein the solution at least comprises clear water;
step 5, slag removal: after the preset standing time, a drill bit is adopted to salvage the sediment at the bottom of the hole, and the wall protection slurry in the drill hole is stood after the sediment removal is finished.
Further, in step 1, the method further comprises:
setting a slurry return tank: excavating a foundation pit groove on the periphery of the top end of a pile position of the constructed rotary excavating pile, and aligning a slurry overflow outlet of a pile casing to the foundation pit groove when the pile casing is embedded;
and 3, when the solution is injected into the pile casing in the step 3, the solution also comprises slurry in a foundation pit groove at the top end of the pile position of the previous constructed rotary digging pile.
Further, the step of pre-calculating the initial amount of chemical pulp powder comprises:
according to a first formula m0＝η0πD2m0l0Calculating to obtain the initial dosage of the chemical slurry powder, wherein m0The initial dosage of the chemical slurry powder is Kg, eta0Taking 1.5-2 for empirical amplification factor, and D is the outer diameter of the rotary excavating pile in units of m and m0The dosage of chemical slurry powder in unit Kg/m is needed to be adopted in unit volume of slurry of a soil layer corresponding to an initial slurry making section3，l0The thickness of the soil layer corresponding to the initial slurry making section is unit m.
Further, the step of pre-calculating the average amount of chemical pulp powder comprises:
according to a first formula
Calculating to obtain the initial dosage of the chemical slurry powder, wherein m is the average dosage of the chemical slurry powder and has the unit of Kg/m, miThe dosage of chemical slurry powder in unit volume of slurry of the ith layer of soil layer is Kg/m3，liIs the thickness of the ith soil layer in m.
Further, before step 1, the method further comprises:
construction preparation: according to a third formula M ═ n η pi D2∑miliCalculating to obtain the total amount of chemical slurry powder required by construction, and stacking the total amount of chemical slurry powder on a construction site, wherein M is the total amount of chemical slurry powder, Kg is the unit, n is the number of rotary excavating piles to be constructed, eta is an empirical amplification coefficient of the amount of chemical slurry powder stored, 1.1-1.5 is taken, D is the outer diameter of the rotary excavating pile, and M are unitsiThe dosage of chemical slurry powder in unit Kg/m is needed to be adopted in the unit volume of the slurry of the ith layer of soil layer3，liIs the thickness of the ith soil layer in m.
Further, the process of embedding the pile casing in the step 1 comprises the following steps:
firstly, a circular pit which is 50-80 cm larger in diameter than the outer diameter of the pile casing and is deeper than the height of the pile casing is excavated on a pile position obtained by measurement and pay-off, a layer of clay is paved at the bottom of the circular pit and is tamped, the pile casing is put into the circular pit, after the lower part of the pile casing is in place, concrete is poured or backfilled between the pile casing and the pit wall of the circular pit and is fixed by tamping, and the distance between the bottom of the embedded pile casing and the ground is not less than 3 m.
Compared with the prior art, the invention has the beneficial effects that: the chemical slurry powder is adopted to directly make slurry in the drill hole, a slurry making pool is not required to be additionally arranged, the construction efficiency is improved while the site field is saved, and the mode of directly making slurry in the drill hole is adopted, so that the wall protection slurry has high utilization rate and low loss, is not easy to generate waste slurry, reduces waste slurry treatment, reduces soil debris content, and has the advantages of energy conservation and environmental protection; the optimal mixing proportion of the chemical slurry powder is designed according to calculation, the adding time and the adding amount of the chemical slurry powder are dynamically controlled, the material control refinement is realized, and the slurry wall protection quality is improved; the wall protection effect of the mud skin is enhanced by utilizing the characteristic of high molecular weight of the chemical slurry powder, the sediment is fully precipitated, the wall protection slurry of a drill bit of the drilling machine is cleaner in the drilling process, the cleaning process of the drilling machine is saved, the secondary hole cleaning work before concrete pouring is reduced, and the effect can be greatly improved; the chemical slurry powder is degradable and pollution-free, compared with the traditional common bentonite slurry making technology, the chemical slurry powder has less slag discharge amount, and reduces the urban traffic control and slag discharge transportation pressure.
Drawings
FIG. 1 is a flow chart of the steps of the slurry wall protection construction method of the present invention;
FIG. 2 is a schematic construction view of the slurry wall protection construction method of the present invention.
In the figure, 1-casing, 2-drilling rig, 21-drill bit, 22-drill rod, 3-foundation pit slot and 4-rotary digging pile
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 and 2, fig. 1 is a flow chart illustrating steps of the slurry retaining wall construction method of the present invention, and fig. 2 is a construction schematic diagram illustrating the slurry retaining wall construction method of the present invention. A method for constructing a mud retaining wall comprises the following steps:
step 1, embedding a pile casing: firstly, measuring and setting out the pile position of the constructed rotary-digging pile, and then embedding a pile casing on the pile position obtained by measuring and setting out;
step 3, initial slurry making: injecting a solution and adding the chemical slurry powder with the initial dosage into the protective cylinder according to the initial dosage of the chemical slurry powder obtained by pre-calculation, and forming wall protection slurry after rotating and stirring through a drill bit, wherein the solution at least comprises clear water;
step 5, slag removal: after the preset standing time, a drill bit is adopted to salvage the sediment at the bottom of the hole, and the wall protection slurry in the drill hole is stood after the sediment removal is finished.
In the step 1, the pile casing is a cylindrical cylinder body which is coaxially arranged with the rotary digging pile under construction, the inner diameter of the pile casing is larger than the diameter of the pile body of the rotary digging pile under construction, the pile casing is a steel pile casing which is formed by processing a steel plate, the top end of the pile casing is provided with a hanging ring, and the upper part of the steel pile casing is provided with a slurry overflow outlet. Before the pile casing is buried, a measurer performs pile position lofting and retesting according to closed leads by using equipment such as a total station and the like, a pile position line is discharged, the pile position of the constructed rotary-digging pile is determined, then the pile casing is buried on the pile position, the center, the perpendicularity and the deviation of the pile casing need to be checked after the pile casing is buried, the center of the pile casing needs to coincide with the center of the pile position, and the perpendicularity and the deviation of the pile casing need to meet the requirements of the perpendicularity and the deviation of the rotary-digging pile.
Further, the process of burying the pile casing in the step 1 comprises:
step 1-1, firstly, digging a circular pit with the diameter 50-80 cm larger than the outer diameter of the pile casing and the depth larger than the height of the pile casing on a pile position obtained by measuring and setting-out, paving a layer of clay at the bottom of the circular pit and tamping the clay, then putting the pile casing into the circular pit, after the bottom of the pile casing is in place, pouring concrete or backfill between the pile casing and the pit wall of the circular pit and fixing the pile casing in a tamping mode, wherein the distance between the bottom of the buried pile casing and the ground is not less than 3 m.
In the step 1-1, in actual use, the pile casing has the functions of guiding the drilling machine, controlling the pile position, isolating ground water leakage, preventing orifice collapse, raising the static pressure water head in the hole, fixing a reinforcement cage and the like. When the pile casing is buried underground, the pile casing is dropped into the round pit, the pile position center is found out firstly, the pile casing is moved, the center of the pile casing is coincided with the pile position center, the deviation between the pile casing center and the pile position center is not more than 5mm, and the pile casing is fixed after the verticality of the pile casing is verified by a horizontal ruler or a suspension wire drop. The protective cylinder is fixed at the right position, the top of the protective cylinder is higher than the ground, and the distance between the bottom of the protective cylinder and the ground is not less than 3 m. In order to reduce disturbance of backfill on the pile casing, concrete is poured between the pile casing and the wall of the round pit, and backfill soil is backfilled and tamped after the poured concrete is solidified.
Further, before step 1, the method further comprises:
step 1a, construction preparation: according to a third formula M ═ n η pi D2∑miliCalculating to obtain the total amount of chemical slurry powder required by construction, and stacking the total amount of chemical slurry powder on a construction site, wherein M is the total amount of chemical slurry powder, Kg is the unit, n is the number of rotary excavating piles to be constructed, eta is an empirical amplification coefficient of the amount of chemical slurry powder stored, 1.1-1.5 is taken, D is the outer diameter of the rotary excavating pile, and M are unitsiThe dosage of chemical slurry powder in unit Kg/m is needed to be adopted in the unit volume of the slurry of the ith layer of soil layer3，liIs the thickness of the ith soil layer in m.
In the step 1a, according to the designed outer diameter of the rotary excavating pile to be constructed and the amount of chemical slurry powder required to be adopted in unit volume of slurry of each soil layer, according to a formula eta pi D2∑miliCalculating to obtain the chemical slurry powder consumption of a single rotary digging pile, and multiplying the chemical slurry powder consumption of the single rotary digging pile by the number of the rotary digging piles to be constructed to obtain the chemical slurry powder consumption required by constructionTotal amount of chemical pulping powder. Enough chemical slurry powder is prepared according to the calculated total consumption of the chemical slurry powder before construction, so that the problem that the construction period is prolonged due to the lack of the chemical slurry powder in the construction process is avoided. m isiThe dosage of chemical slurry powder is needed to be adopted in the unit volume of the slurry of the ith layer of soil, and the value is shown in the table 1iThe thickness of the ith soil layer can be obtained through experiments.
TABLE 1 dosage of chemical slurry powder to be used in unit volume of slurry of various soil layers
In the step 2, the drilling machine comprises a drill rod, a drill bit coaxially arranged at the bottom of the drill rod and a driving mechanism for driving the drill rod to rotate continuously, and the drill bit is provided with a rotary digging barrel. And moving the drill bit of the drilling machine into the protective cylinder, installing and adjusting the drill bit to align the drill bit to the center of the pile position, integrally checking the drilling machine, and timely eliminating faults.
In the step 3, before the drilling of the drilling machine is driven, wall protection slurry is manufactured inside the protective cylinder, solution and chemical slurry powder are injected into the protective cylinder, the addition amount of the chemical slurry powder is the initial amount obtained through pre-calculation, then the drill rod is driven to rotate, the drill bit is driven to rotate and stir the solution and the chemical slurry powder in the protective cylinder, the rotation time is 5-10 min, therefore, the wall protection slurry is formed in the protective cylinder, then the test rechecking is carried out on the specific gravity, the viscosity and the sand content of the wall protection slurry, and the subsequent construction is carried out after the design index requirements are met.
Further, in step 3, the step of pre-calculating the initial amount of the chemical slurry powder comprises:
step 3-1, according to a first formula m0＝η0πD2m0l0Calculating to obtain the initial dosage of the chemical slurry powder, wherein m0The initial dosage of the chemical slurry powder is Kg, eta0Taking 1.5-2 for empirical amplification factor, and D is the outer diameter of the rotary excavating pile in units of m and m0Is an initial slurry making sectionThe dosage of chemical slurry powder in unit Kg/m is needed to be adopted in unit volume of slurry corresponding to soil layer3，l0The thickness of the soil layer corresponding to the initial slurry making section is unit m.
In the above step 3-1, m0The dosage of chemical slurry powder is needed to be adopted in unit volume of slurry of a soil layer corresponding to an initial slurry making section, and the value is referred to table 1; l0For the initial thick liquid section of making corresponds soil layer thickness, protect the distance between a section of thick bamboo and the ground promptly, be no less than 3 meters. In the embodiment, the dosage of the chemical slurry powder is calculated according to a formula according to the stratum condition before drilling, the chemical slurry powder is quantitatively and finely prepared, and the on-site material inventory pressure is reduced.
Further, in step 1, the method further comprises:
step 1-2, setting a slurry return tank: excavating a foundation pit groove on the periphery of the top end of a pile position of the constructed rotary excavating pile, and aligning a slurry overflow outlet of a pile casing to the foundation pit groove when the pile casing is embedded;
and 3, when the solution is injected into the pile casing in the step 3, the solution also comprises slurry in a foundation pit groove at the top end of the pile position of the previous constructed rotary digging pile.
In this embodiment, a foundation pit groove is excavated around the top end of a pile site of a rotary pile under construction, the foundation pit groove is used for collecting slurry, gravel and the like flowing out of a slurry overflow outlet of a pile casing and used for depositing gravel in the slurry when drilling construction is carried out on the pile site of the rotary pile under construction, the slurry after the gravel is deposited through the foundation pit groove can be used for carrying out slurry retaining wall construction under the construction of the pile site of the next rotary pile, and when solution is injected into the pile casing, the slurry in the foundation pit groove is injected into the pile casing as the solution, so that the cyclic use of the slurry is realized, and the construction cost is further saved.
In the step 4, the drill bit is lowered to the bottom of the protective cylinder, the drill bit is driven to drill into the soil layer in the protective cylinder, in the process that the drill bit drills downwards and reaches the preset design depth, chemical slurry powder with the average dosage is added into the slurry of the protective wall to dynamically supplement the slurry, the quality of the slurry of the protective wall is guaranteed, the finally formed slurry protective wall can meet the design requirement, the chemical slurry powder does not need to be added when the drill bit reaches the distance from the preset depth to the design hole depth, the preset design depth is determined according to the design hole depth, and the distance between the preset design depth and the design hole depth is 3 m. The mode of directly making thick liquid in the drilling is adopted, chemical mud powder and solution are added in the drilling, the in-process that descends at the drill bit is stirred in step, the useless thick liquid is not produced basically in the work progress, the high-usage of dado mud need not to carry out useless thick liquid and handles, and the circulation volume of mud is little, only can accomplish the recycling of mud through setting up the foundation ditch groove at the top of stake position.
Further, in step 4, the step of pre-calculating the average amount of the chemical slurry powder comprises:
step 4-1, according to a first formula
Calculating to obtain the initial dosage of the chemical slurry powder, wherein m is the average dosage of the chemical slurry powder and has the unit of Kg/m, miThe dosage of chemical slurry powder in unit volume of slurry of the ith layer of soil layer is Kg/m3，liIs the thickness of the ith soil layer in m.
In the step S4-1, the average amount of chemical grout powder is calculated according to the formula before drilling according to the formation condition, the chemical grout powder is quantitatively refined, the on-site material inventory pressure is reduced, and the quality of the wall protection slurry is ensured by dynamically replenishing slurry in the process of lowering the drill bit, so that the finally formed slurry protection wall can meet the design requirements.
In the step 5, after the drill bit is lowered to the designed hole depth, drilling is completed, after the preset standing time is stopped, the preset standing time is 15-40min, the drill bit is used for salvaging sediment at the bottom of the drilled hole, the content of soil scraps in slurry in the drilled hole is reduced, the circulating deslagging pressure of the slurry is reduced, the wall protection slurry of the drilled hole is kept standing after the slag removal operation is completed, a slurry wall protection is formed, and preparation is made for installing a reinforcement cage of a subsequent rotary drilling pile and pouring underwater concrete.
Compared with the prior art, the invention has the beneficial effects that: the chemical slurry powder is adopted to directly make slurry in the drill hole, a slurry making pool is not required to be additionally arranged, the construction efficiency is improved while the site field is saved, and the mode of directly making slurry in the drill hole is adopted, so that the wall protection slurry has high utilization rate and low loss, is not easy to generate waste slurry, reduces waste slurry treatment, reduces soil debris content, and has the advantages of energy conservation and environmental protection; the optimal mixing proportion of the chemical slurry powder is designed according to calculation, the adding time and the adding amount of the chemical slurry powder are dynamically controlled, the material control refinement is realized, and the slurry wall protection quality is improved; the wall protection effect of the mud skin is enhanced by utilizing the characteristic of high molecular weight of the chemical slurry powder, the sediment is fully precipitated, the wall protection slurry of a drill bit of the drilling machine is cleaner in the drilling process, the cleaning process of the drilling machine is saved, the secondary hole cleaning work before concrete pouring is reduced, and the effect can be greatly improved; the chemical slurry powder is degradable and pollution-free, compared with the traditional common bentonite slurry making technology, the chemical slurry powder has less slag discharge amount, and reduces the urban traffic control and slag discharge transportation pressure.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention will still fall within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.
Claims (6)
1. The method for constructing the mud retaining wall is characterized by comprising the following steps of:
step 1, embedding a pile casing: firstly, measuring and setting out the pile position of the constructed rotary-digging pile, and then embedding a pile casing on the pile position obtained by measuring and setting out;
step 2, positioning a drilling machine: placing a drill bit of a drilling machine in the pile casing, and enabling the drill bit to correspond to the center point of the pile position;
step 3, initial slurry making: injecting a solution and adding the chemical slurry powder with the initial dosage into the protective cylinder according to the initial dosage of the chemical slurry powder obtained by pre-calculation, and forming wall protection slurry after the chemical slurry powder is rotationally stirred by the drill bit, wherein the solution at least comprises clear water;
step 4, drilling construction and dynamic slurry supplement: adopting the drill bit to drill downwards to the designed hole depth to obtain a drilled hole, wherein when the drill bit descends 1 m in the process of drilling downwards and reaching the preset design depth, adding the average amount of chemical slurry powder into the wall protection slurry according to the average amount of the chemical slurry powder calculated in advance, wherein the preset design depth is smaller than the designed hole depth;
step 5, slag removal: and after the preset standing time, fishing the sediment at the bottom of the hole by using the drill bit, and standing the wall protection slurry in the drill hole after the sediment removal is finished.
2. The mud dado construction method of claim 1, further comprising, in the step 1:
setting a slurry return tank: excavating a foundation pit groove on the periphery of the top end of a pile position of the constructed rotary excavating pile, and aligning a slurry overflow outlet of the pile casing to the foundation pit groove when the pile casing is embedded;
and 3, when the solution is injected into the pile casing in the step 3, the solution also comprises slurry in a foundation pit groove at the top end of the pile position of the previous constructed rotary digging pile.
3. The mud dado construction method of claim 1, wherein the step of pre-calculating an initial amount of chemical grout powder comprises:
according to a first formula m0＝η0πD2m0l0Calculating to obtain the initial dosage of the chemical slurry powder, wherein m0The initial dosage of the chemical slurry powder is Kg, eta0Taking 1.5-2 for empirical amplification factor, and D is the outer diameter of the rotary excavating pile in units of m and m0The dosage of chemical slurry powder in unit Kg/m is needed to be adopted in unit volume of slurry of a soil layer corresponding to an initial slurry making section3，l0The thickness of the soil layer corresponding to the initial slurry making section is unit m.
4. The mud dado construction method of claim 1, wherein the step of pre-calculating the average amount of chemical grout powder comprises:
according to a first formula
Calculating to obtain the initial dosage of the chemical slurry powder, wherein m is the average dosage of the chemical slurry powder and has the unit of Kg/m, miThe dosage of chemical slurry powder in unit volume of slurry of the ith layer of soil layer is Kg/m3，liIs the thickness of the ith soil layer in m.
5. The mud dado construction method of claim 1, wherein prior to step 1, the method further comprises:
construction preparation: according to a third formula M ═ n η pi D2∑miliCalculating to obtain the total amount of chemical slurry powder required by construction, and stacking the total amount of chemical slurry powder on a construction site, wherein M is the total amount of chemical slurry powder, Kg is the unit, n is the number of rotary excavating piles to be constructed, eta is an empirical amplification coefficient of the amount of chemical slurry powder stored, 1.1-1.5 is taken, D is the outer diameter of the rotary excavating pile, and M are unitsiThe dosage of chemical slurry powder in unit Kg/m is needed to be adopted in the unit volume of the slurry of the ith layer of soil layer3，liIs the thickness of the ith soil layer in m.
6. The mud dado construction method of claim 1, wherein the process of burying the casing in step 1 comprises:
firstly, excavating a circular pit with the diameter ratio 50-80 cm larger than the outer diameter of the pile casing and the depth larger than the height of the pile casing on a pile position obtained by measuring and setting-out, paving a layer of clay at the bottom of the circular pit and tamping the clay, then putting the pile casing into the circular pit, after the lower part of the pile casing is in place, pouring concrete or backfilling between the pile casing and the pit wall of the circular pit and fixing the pile casing in a tamping mode, wherein the distance between the bottom of the pile casing and the ground after embedding is not less than 3 meters.
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