CN110424434B - Stirring pile waterproof curtain for sea filling deep block stone area and construction method - Google Patents
Stirring pile waterproof curtain for sea filling deep block stone area and construction method Download PDFInfo
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- CN110424434B CN110424434B CN201910680389.1A CN201910680389A CN110424434B CN 110424434 B CN110424434 B CN 110424434B CN 201910680389 A CN201910680389 A CN 201910680389A CN 110424434 B CN110424434 B CN 110424434B
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- 238000003756 stirring Methods 0.000 title claims abstract description 163
- 238000010276 construction Methods 0.000 title claims abstract description 86
- 239000004575 stone Substances 0.000 title claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 48
- 239000002689 soil Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 21
- 239000004927 clay Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000004568 cement Substances 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000007788 liquid Substances 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
- 230000035699 permeability 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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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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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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a stirring pile waterproof curtain for a sea filling deep and thick block stone area and a construction method thereof. The method comprises the following steps: (1) reinforcing the mixing pile of the soil layer above the rock-block-containing layer along the axis direction of the foundation pit support; (2) drilling and hole guiding construction is carried out on the consolidated rock block layer by adopting a rotary drilling rig; (3) backfilling clay in a hole guiding construction area of the rotary drilling rig; (4) and (5) carrying out construction of a stirring pile waterproof curtain on the treated block stone area. According to the construction method, the soil layer above the block stone area is reinforced, so that the construction of drilling and leading holes in the groove sections can be completed, the cohesive soil or sandy soil can be backfilled in the drilled holes, and then the construction of the conventional stirring pile waterproof curtain is performed, so that the problem that the stirring pile waterproof curtain cannot be constructed on the soil layer containing the block stones is solved.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a stirring pile waterproof curtain for a sea-filling deep and thick block stone area and a construction method thereof.
Background
In the foundation pit supporting construction process in areas with high underground water level, complex stratum structure and hydrogeological conditions (deep block stone layer, near-sea deep riprap area and pebble layer), in order to prevent underground water from permeating into a foundation pit, one or more rows of stirring pile water-stopping curtain construction is carried out on the outer side of a foundation pit supporting pile, the stirring piles are mutually occluded, and a circle of closed water-stopping system is formed on the periphery of the foundation pit supporting pile. However, when the stratum contains the rock blocks, the riprap, the pebbles and the construction waste, the rock blocks, the riprap, the pebbles and the construction waste are removed without taking corresponding measures, and the mixing pile cannot be constructed in the soil layer of the area.
The Chinese patent with the patent number 201510621731.2 discloses a waterproof curtain for a region containing stones and a construction method thereof, the construction method is to excavate a discharge guide groove for discharging slurry in the region containing stones outside a foundation pit and at a preset position of the waterproof curtain, then at least one row of jet grouting piles are constructed at the preset position of the waterproof curtain, and adjacent jet grouting piles are mutually meshed to form the waterproof curtain. However, the rotary spraying pile is formed by placing a rotary spraying grouting pipe and a nozzle drill at a designed elevation at the bottom of the pile by adopting a rotary drilling rig, enabling a prepared slurry to pass through a high-pressure generating device to enable a liquid flow to obtain huge energy and then to be sprayed out from a nozzle at the edge of the grouting pipe at a high speed, and lifting a drill rod while rotating to enable the slurry to be fully stirred and mixed with a soil body. If the soil layer strength can not meet the requirement, the phenomenon of hole collapse can easily occur in the drilling process, and the construction of the jet grouting pile can not be realized. Particularly, in a sea filling area, the construction area is surrounded by the sea on three sides, the underground water level is consistent with the elevation of the sea level, the sea is greatly influenced by the tide of the sea, the upper stratum is mainly a hydraulic fill sand layer which is in a loose state and a strong permeable layer, the permeability coefficient of the hydraulic fill sand layer is about 2.0 multiplied by 10 < -2 > cm/s, the soil layer structure is loose, the self-stability is poor, the rotary jet drilling machine is easy to collapse in the drilling process, and the safety and the feasibility of construction cannot be guaranteed.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method of a waterproof curtain of a mixing pile for filling a deep and thick rock block area in the sea, which can effectively solve the problem that the waterproof curtain of the mixing pile cannot be constructed in a soil layer containing the rock block under the condition of ensuring the stability of a sand filling layer.
In order to solve the problems, the invention provides a stirring pile waterproof curtain for a deep block stone area in sea filling, which is characterized in that: the waterproof curtain comprises a stirring pile reinforcing body arranged above a rock block layer, a backfill layer arranged in the regional range of the stirring pile reinforcing body and a stirring pile waterproof structure arranged in the regional range of the backfill layer, wherein the stirring pile reinforcing body is formed by mutually meshing a plurality of rows of stirring piles, and the stirring pile waterproof structure is formed by mutually meshing a plurality of cement stirring piles; the backfill layer is a filling soil layer formed by backfilling clay or sandy soil in the holes after groove sections in the reinforced body area of the mixing pile are led at intervals by adopting a rotary drilling rig, and the construction of the water stop structure of the mixing pile is carried out after the construction of the filling soil layer in each leading hole groove section is finished, wherein the backfill depth of the backfill layer is equal to or greater than the depth of the water stop structure of the mixing pile, and the width of the backfill layer is greater than the width of the water stop structure of the mixing pile; the plurality of hole guiding groove sections, the backfill layer and the stirring pile water stopping structure which are arranged in the hole guiding groove sections are connected into a whole, and the hole guiding holes of two adjacent rotary drilling rigs are overlapped with each other.
The invention has the following excellent technical scheme: the stirring pile reinforcing body is formed by mutually meshing 5-8 rows of cement stirring piles; each stirring water-stopping pile of the stirring pile water-stopping structure is constructed in a two-spraying and two-stirring mode; the stirring pile reinforcing body and the stirring water stop structure are constructed by adopting a single-shaft stirring pile machine or a multi-shaft stirring pile machine in a sleeving or overlapping mode.
The invention has the following excellent technical scheme: the length of the hole guiding groove section is 3-6 m, and the width of the superposition between the guiding holes of two adjacent rotary drilling rigs is larger than the diameter of a single stirring water stopping pile of the stirring pile water stopping structure; and a plain concrete pile supplementing structure is arranged outside the connecting gap of the water stopping structure of the mixing pile of the adjacent hole guiding groove sections.
The invention has the following excellent technical scheme: after the hole guiding, backfilling and stirring water stopping pile construction of the two spaced hole guiding groove sections is completed and the strength of the stirring water stopping pile reaches 50-70%, the hole guiding, backfilling and stirring water stopping pile construction of the hole guiding groove section area between the two spaced hole guiding groove sections are performed.
The technical scheme provided by the invention is as follows: the construction method of the stirring pile waterproof curtain for the sea-filling deep and thick block stone area comprises the construction of a foundation pit supporting structure, wherein the stirring pile waterproof curtain is constructed on the outer side of the foundation pit supporting structure, and is characterized in that the concrete construction steps of the waterproof curtain for the block stone area of the foundation pit are as follows:
(1) carrying out mixing pile reinforcement on soil layers above the stone layer in the region containing the stone layer along the axis direction of the foundation pit support, wherein the width of the reinforced region is larger than the construction width of the waterproof curtain;
(2) conducting hole leading partition according to the preset position of the waterproof curtain in the reinforced stone layer area, wherein the waterproof curtain is divided into a first hole leading groove section with the length of 4-6 m and a second hole leading groove section with the length of 3-5 m, and the first hole leading groove section and the second hole leading groove section are distributed at intervals; when the strength of the mixing pile in the step (1) reaches 70%, drilling guide holes by using a rotary drilling rig aiming at the first guide hole groove section, wherein the guide hole depth of the rotary drilling rig is consistent with or greater than the design depth of the waterproof curtain, then pulling out a drill rod from the holes, wherein two adjacent guide holes in each first guide hole groove section are overlapped with each other, and a plurality of guide holes after construction are communicated with each other;
(3) backfilling the cavity in the first hole guiding groove section after the drilling construction in the step (2) by adopting clay or sandy soil, compacting, and then constructing a stirring pile waterproof curtain in a backfilling area;
(4) when the strength of the waterproof curtain stirring piles in the two adjacent first hole guiding groove sections reaches 50-70%, hole guiding construction is carried out in a second hole guiding groove section between the two adjacent first hole guiding groove sections, the construction mode of the hole guiding construction is the same as that of the first hole guiding groove section in the step (2), and the holes at the two end parts of the second hole guiding groove section are overlapped with the waterproof curtain in the constructed first hole guiding groove section;
(5) and (4) backfilling the hollow area in the second hole guiding groove section by repeating the step (3), and constructing a stirring pile waterproof curtain in the backfilled area after compaction, wherein the stirring pile waterproof curtain of the second hole guiding groove section is connected with the stirring pile waterproof curtain in the first hole guiding groove section with the two sides constructed in advance into a whole.
The invention has the following excellent technical scheme: after the construction in the step (5) is finished, constructing a single or a plurality of plain concrete cast-in-place piles by adopting C15 concrete doped with an expanding agent on one side, far away from the foundation pit supporting structure, of the connecting part of the stirring pile waterproof curtain of the second lead-hole groove and the stirring pile waterproof curtain of the first lead-hole groove section constructed in advance, wherein the lap joint thickness of the single or the plurality of plain concrete cast-in-place piles and the stirring pile waterproof curtain is 8-12 cm, and the pile length of the single or the plurality of plain concrete cast-in-place piles is equal to that of the stirring pile waterproof curtain; when a single plain concrete cast-in-place pile is adopted, the diameter of the pile is larger than or equal to 1200 mm; when a plurality of plain concrete cast-in-place piles are adopted, the diameter of each plain concrete cast-in-place pile is equivalent to that of the mixing pile waterproof curtain, and the plain concrete cast-in-place piles are mutually lapped.
The invention has the following excellent technical scheme: and (2) reinforcing the stirring piles in the step (1) by using 5-8 rows of cement stirring piles constructed along the axis direction of the foundation pit, immediately constructing the second row of stirring piles after the construction of each row of stirring piles is finished, and interlocking adjacent stirring piles with each other until the stirring depth of each row of stirring piles reaches the top surface of a stone layer.
The invention has the following excellent technical scheme: when the rotary drilling rig is adopted for hole guiding in the step (2), simultaneously adopting a slurry retaining wall, stopping drilling after the drilling is carried out to the designed depth, pulling out a drill rod from the hole, and taking out the rock block, wherein the width of mutual coincidence between every two adjacent guide holes in each guide hole groove section is larger than the diameter of a single stirring pile of the waterproof curtain; the performance indexes of the wall protection slurry are as follows: the mud proportion is 1.05-1.20 r, the viscosity is less than 28s, the sand content is less than 8%, the colloid content is greater than 96%, the water loss rate is less than or equal to 25ml/30min, and the pH value is 7-10.
The invention has the following excellent technical scheme: the backfilling in the step (3) adopts layered backfilling, the backfilling depth of each layer is 1.5-2.5 m, the backfilling of each layer is compacted by a rotary drilling rig, and the next layer of backfilling work is carried out; the construction and backfill work of each guide hole groove section is controlled within 24 hours.
The invention has the following excellent technical scheme: the stirring pile waterproof curtain in the step (3) and the step (5) is formed by constructing a three-axis stirring pile, a two-spraying and two-stirring mode is adopted in the construction process, the cement mixing amount is controlled to be 25% -35%, and the water cement ratio is 1.0-1.2.
The invention has the beneficial effects that:
(1) according to the method, firstly, a stirrer is adopted to reinforce the soil layer above the block stone region, then the rotary drilling rig is adopted to conduct hole leading, and the addition of the stirring piles effectively avoids hole collapse in the hole leading process of the rotary drilling rig, so that continuous adjacent hole leading can be ensured, and finally grooves are formed; the pile bodies are mutually occluded in the construction process of the mixing pile, so that the integral strength of the reinforcing body is improved;
(2) according to the invention, the depth of a hole leading of the rotary drilling rig is consistent with the design depth of the waterproof curtain, the rock blocks can be effectively taken out or pressed below the design depth of the waterproof curtain, soil is continuously taken out and holes are swept, the problem that the rock blocks cannot be completely taken out in the depth of the waterproof pile is avoided, the depth of the general waterproof curtain reaches the clay layer, clay is led into the clay layer, an open type cylindrical drill bit is adopted, cohesive force is provided, part of the rock blocks can be taken out of the holes, the pile length of the waterproof pile is ensured, and the quality of the waterproof curtain is ensured;
(3) according to the invention, the water-stopping piles are constructed and stirred by guiding holes in the groove sections, and the water-stopping piles are constructed in the way of guiding holes in the interval groove sections, so that the hole collapse phenomenon after the groove is formed is prevented, and sand and soil are backfilled in time after the hole is guided and the groove is formed;
(4) according to the method, the holes in the rotary excavation lead hole area are backfilled by using cohesive soil or sandy soil and are compacted in a layered mode, so that the strength of the backfilled soil layer meets the construction requirement, and the construction of the stirring pile waterproof curtain at the later stage can be facilitated.
(5) When the rotary drilling rig is used for guiding holes, the mud retaining wall is adopted to fix the wall of a sand layer below a reinforced body and prevent a soil body from collapsing, the mud is prepared by a mud test according to geological conditions, a hole forming method, mud application and the like, the mixing ratio of the mud is determined, and the wall protecting performance of the mud is ensured.
(6) Because the lower part of a backfilled sand layer cannot be compacted and a cavity is easy to form, the cavity area can not be formed by one-time stirring of the three-axis stirring pile up and down, and the backfilling area is saturated sandy soil, the conventional cement mixing amount and the curing price of the saturated sandy soil are poor, so that the forming quality of the stirring pile is influenced; the invention adopts the mode of repeatedly stirring once for the stirring pile in the rock block area, namely, two-spraying and two-stirring for construction, and simultaneously, the cement mixing amount is adjusted to 35 percent, and the water cement ratio is adjusted to 1.0, thereby avoiding the problems that the cavity area of the backfilled sand layer can not be formed and the forming quality is poor;
(7) the invention carries out pile filling on the cold joint part of the connecting parts of the two groove sections at the outermost side, thereby avoiding the occurrence of cold joints, ensuring that the pile filling effect is ensured because the overlapping thickness of the pile and the pile in the inner row is about 10cm, and the pile length is the same as that of the pile in the inner row.
According to the construction method, the soil layer above the block stone area is reinforced, so that the construction of drilling and leading holes in the groove sections can be completed, the cohesive soil or sandy soil can be backfilled in the drilled holes, and then the construction of the conventional stirring pile waterproof curtain is performed, so that the problem that the stirring pile waterproof curtain cannot be constructed on the soil layer containing the block stones is solved.
Drawings
FIG. 1 is a schematic plan view of a mixing pile for use in areas containing rock particles according to the present invention;
FIG. 2 is an enlarged view of the location B in FIG. 1;
FIG. 3 is a longitudinal sectional view of the water stop curtain of the present invention;
4-1 to 4-3 are schematic views illustrating steps of constructing a waterproof curtain by dividing a groove section and leading holes;
FIG. 5 is a schematic cross-sectional view of the mixing pile after the reinforcement is completed;
FIG. 6 is a schematic cross-sectional view of the present invention after drilling is complete;
FIG. 7 is a schematic plan view of a plain concrete pile repair construction;
fig. 8 is a schematic view of the construction process of the mixing water stop pile of the present invention.
In the figure: 10-a block stone layer, 11-a stirring pile reinforcing body, 12-a stirring pile water stop structure, 13-a rotary drilling rig guide hole, 14-a first guide hole groove section, 15-a backfill layer, 16-a second guide hole groove section, 17-a plain concrete pile filling structure and 18-a foundation pit supporting structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Fig. 1 to 6 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed 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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The concrete structure of the stirring pile waterproof curtain for filling a deep and thick rock block area provided in the embodiment is shown in fig. 1 to 3, the waterproof curtain comprises a stirring pile reinforcing body 11 arranged above a rock block layer 10, a backfill layer 15 arranged in the area range of the stirring pile reinforcing body 11 and a stirring pile waterproof structure 12 arranged in the area range of the backfill layer 15, wherein the stirring pile reinforcing body 11 is formed by mutually meshing 5-8 drainage cement stirring piles; the mixing pile water stopping structure 12 is formed by mutually meshing a plurality of cement mixing piles; and each stirring water-stopping pile of the stirring water-stopping structure 12 is constructed in a two-spraying and two-stirring manner; the mixing pile reinforcing body 11 and the mixing water stop structure 12 are constructed by adopting a sleeve-beating or lap-joint mode of a triaxial mixing pile machine. The backfill layer 15 is formed by backfilling a soil filling layer formed by clay or sand in holes after the holes are led at intervals in the groove sections in the stirring pile reinforcing body 11 area by adopting a rotary drilling rig, and constructing the stirring pile water stop structure 12 after the soil filling layer construction in each hole leading groove section is completed, wherein the hole leading construction process of the groove sections is shown in fig. 4-1 to fig. 3-3, and when the strength of the stirring water stop pile reaches 50-70% after the hole leading, backfilling and stirring water stop pile construction of the two hole leading groove sections is completed, the hole leading, backfilling and stirring water stop pile construction of the area between the two hole leading groove sections are performed. The backfill depth of the backfill layer 15 is equal to the depth of the stirring pile water stopping structure 11, and the width of the backfill layer is larger than the width of the stirring pile water stopping structure 12; the multiple hole guiding groove sections, the backfill layers 15 and the stirring pile water stopping structures 12 which are arranged in the hole guiding groove sections are connected into a whole, the guiding holes 13 of two adjacent rotary drilling rigs are overlapped with each other, the overlapped width of the guiding holes is larger than the diameter of a single stirring water stopping pile of the stirring pile water stopping structures 12, and plain concrete pile supplementing structures 17 are arranged on the outer sides of connecting gaps of the stirring pile water stopping structures 12 of the adjacent hole guiding groove sections.
The construction method of the present invention will be further described with reference to specific examples,the embodiment aims at a certain sea-facing deep backfill block stone area, the area adopts a stone throwing and sea filling process, the sea is surrounded on three sides of the field, the underground water level is consistent with the sea level elevation, and the stratum structure and the hydrogeological condition are complex (a deep block stone layer and a sea-facing deep stone throwing area), the influence of the tide of the sea is large, the upper stratum is mainly a blow-filled sand layer, is in a loose state, is loose in structure and is poor in self-stability. The perimeter of a foundation pit of the construction project is 590 m, the depth is 15.5-17.5 m, the foundation pit support mainly adopts a support form of cast-in-place piles, a waterproof curtain, two inner supports and pile front passive area reinforcement, the waterproof curtain is constructed outside the foundation pit support, the waterproof mode adopts a supporting pile outside triaxial stirring pile waterproof curtain, and the diameter of a waterproof curtain pile is equal to that of a waterproof curtain
The pile spacing is 1200mm, the construction of a hole is adopted to cup joint, the stirring pile waterproof curtain is positioned on the outer side of a cast-in-place pile of the foundation pit supporting structure and forms a complete foundation pit supporting system with the cast-in-place pile, and the stirring pile waterproof curtain is implemented in a mutual occlusion mode along the foundation pit supporting direction.
According to a water-stop pile survey report and a field test, backfill block stones are mainly deposited as caisson bank protection block stones about 10 m below a soil covering layer, a construction area of a water-stop curtain of the project is shown in figure 1 and comprises a plurality of block stone layer areas, and a conventional water-stop curtain of a stirring pile cannot be normally constructed, so that technicians of the project adopt the method for construction, and the concrete construction steps are as follows:
(1) in order to avoid stratum collapse and collapse accidents in the process of hole leading construction of a rotary drilling rig, firstly, stirring pile reinforcement treatment is carried out on the stratum above a rock layer 10 to form a stirring pile reinforcement body 11 with certain strength, the stirring pile reinforcement body comprises 5 rows of cement slurry stirring piles, a stirring pile machine is adopted to carry out first row of stirring pile construction on the area containing the rock layer, after the first row of stirring pile construction is finished, second row construction is carried out immediately, the process is repeated, the construction is carried out till the fifth row is finished, and finally a stirring pile reinforcement body 11 is formed; according to the field conditions, a row of three-axis stirring piles (reinforcing piles) are additionally arranged on the inner side and the outer side of the section close to the sea and the east door on the original basis, and the rest sections are not increased;
(2) according to the preset position of the waterproof curtain in the reinforced stone layer area, carrying out lead hole partition, wherein the partition schematic diagram is shown in fig. 4-1 to 4-2, and the partition schematic diagram is divided into a first lead hole groove section 14 with the length of 4.5m and a second lead hole groove section 16 with the length of 3.6 m; when the strength of the mixing pile in the step (1) reaches 70%, as shown in fig. 4-1, a rotary drilling rig is adopted to drill a leading hole aiming at the first leading hole groove section 14, the leading hole depth of the rotary drilling rig is consistent with the design depth of the waterproof curtain, then a drill rod is lifted out of the hole, two adjacent leading holes in each leading hole groove section are overlapped with each other, the overlapping width is larger than the diameter of a single waterproof curtain mixing pile, and a plurality of leading holes after construction are communicated with each other; when a rotary drilling rig is used for hole leading, because soil body reinforcement is not carried out on the lower section of the rock block, a slurry retaining wall is required to be adopted, the main function of the slurry in the hole forming process is to fix the wall and reinforce a sand layer below a body, the soil body is prevented from collapsing, the slurry is prepared in a trial mode according to geological conditions, a hole forming method, the slurry application and the like before the slurry is mixed, the mixing ratio of the slurry is determined, and the performance index of the prepared slurry reaches the following requirements: the mud proportion is 1.05-1.20 r, the viscosity is less than 28s, the sand content is less than 8%, the colloid content is greater than 96%, the water loss rate is less than or equal to 25ml/30min, and the pH value is 7-10; stopping drilling by the rotary drilling rig after the rotary drilling rig drills to a designed depth, pulling out a drill rod from a hole, and taking out a rock block, wherein the width of mutual coincidence between every two adjacent guide holes in each guide hole groove section is larger than the diameter of a single stirring pile of the waterproof curtain;
(3) as shown in fig. 4-2, backfilling the cavity in the first hole guiding groove section after the drilling construction in the step (2) by using clay or sand, and backfilling layer by layer, wherein the backfilling depth of each layer is 1.5-2.5 m, and each layer is compacted by using a rotary drilling rig after backfilling, and then performing next layer backfilling work; the construction and backfill work of each guide hole groove section is controlled within 24 hours; after the backfilling operation is finished, constructing a stirring pile waterproof curtain in a backfilling area, wherein each stirring waterproof pile adopts repeated stirring once, namely two-spraying and two-stirring, the cement mixing amount is adjusted to be 35%, the water-cement ratio is adjusted to be 1.0, and the construction process of each stirring waterproof pile is shown in fig. 8;
(4) when the strength of the waterproof curtain mixing piles in the two adjacent first hole guiding groove sections 14 reaches 50-70%, as shown in fig. 4-3, hole guiding construction is carried out on a second hole guiding groove section 16 between the two adjacent first hole guiding groove sections 14 in the same construction mode as the first hole guiding groove section 14 in the step (2), and the holes at the two end parts of the second hole guiding groove section 16 are superposed with the waterproof curtain in the constructed first hole guiding groove section 14;
(5) backfilling a hole region in the second hole guiding groove section 16, compacting, and constructing a stirring pile waterproof curtain in the backfilling region of the second hole guiding groove section 16, wherein the backfilling process and the construction of the stirring pile waterproof curtain are the same as those in the step (3), and the stirring pile waterproof curtain of the second hole guiding groove section 16 is connected with the stirring pile waterproof curtain in the first hole guiding groove section 14 which is constructed at two sides in advance into a whole;
(6) after the construction in the step (5) is completed, constructing a single plain concrete cast-in-place pile with the diameter of 1200mm by adopting C15 concrete doped with an expanding agent on one side, far away from the foundation pit supporting structure, of the connecting part of the stirring pile waterproof curtain of the second hole guiding groove section 16 and the stirring pile waterproof curtain of the first hole guiding groove section 14, wherein the lap joint thickness of the single plain concrete cast-in-place pile and the stirring pile waterproof curtain is 8-12 cm, and the pile length of the single plain concrete cast-in-place pile is equal to that of the stirring pile waterproof curtain.
In the construction process, in order to prevent the drill from inclining outside, a crawler track is paved with 6 x 2 meters of steel plates with the thickness of 30 cm. The 700mm 12m pairs of section steel are propped to the opposite side of the orifice, and the pressure of the orifice at the inner side is reduced. Each pilot slot segment must complete within 24 hours and backfill is completed the day, strictly prohibiting successful pilot holes from being placed overnight.
The stirring pile waterproof curtain for the block stone area and the construction method thereof can effectively solve the problem that the stirring pile cannot be constructed on the soil layer containing the block stone.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a stirring stake stagnant water curtain for filling in sea deep block stone district, is located the outside of excavation supporting structure, its characterized in that: the waterproof curtain is constructed aiming at a region containing the rock blocks of a foundation pit and comprises a stirring pile reinforcing body (11) arranged above the rock block layer (10), a backfill layer (15) arranged in the region of the stirring pile reinforcing body (11) and a stirring pile waterproof structure (12) arranged in the region of the backfill layer (15), wherein the stirring pile reinforcing body (11) is formed by mutually meshing a plurality of rows of stirring piles, and the stirring pile waterproof structure (12) is formed by mutually meshing a plurality of cement stirring piles; the backfill layer (15) is a filling soil layer formed by backfilling clay or sand in holes after the holes are led at intervals in the groove sections in the area of the reinforced body (11) of the mixing pile by adopting a rotary drilling rig, the construction of the water stopping structure (12) of the mixing pile is carried out after the construction of the filling soil layer in each hole leading groove section is finished, the backfill depth of the backfill layer (15) is equal to or greater than the depth of the water stopping structure (12) of the mixing pile, and the width of the backfill layer is greater than the width of the water stopping structure (12) of the mixing pile; the multiple hole guiding groove sections, the backfill layer (15) and the stirring pile water stopping structure (12) which are arranged in the hole guiding groove sections are connected into a whole, and the guiding holes (13) of two adjacent rotary drilling rigs are overlapped;
the construction steps of the stirring pile waterproof curtain for the sea filling deep block stone area are as follows:
(1) carrying out mixing pile reinforcement on soil layers above the stone layer in the region containing the stone layer along the axis direction of the foundation pit support, wherein the width of the reinforced region is larger than the construction width of the waterproof curtain;
(2) conducting hole leading partition according to the preset position of the waterproof curtain in the reinforced stone layer area, wherein the waterproof curtain is divided into a first hole leading groove section with the length of 4-6 m and a second hole leading groove section with the length of 3-5 m, and the first hole leading groove section and the second hole leading groove section are distributed at intervals; when the strength of the mixing pile in the step (1) reaches 70%, drilling guide holes by using a rotary drilling rig aiming at the first guide hole groove section, wherein the guide hole depth of the rotary drilling rig is consistent with or greater than the design depth of the waterproof curtain, then pulling out a drill rod from the holes, wherein two adjacent guide holes in each first guide hole groove section are overlapped with each other, and a plurality of guide holes after construction are communicated with each other;
(3) backfilling the cavity in the first hole guiding groove section after the drilling construction in the step (2) by adopting clay or sandy soil, compacting, and then constructing a stirring pile waterproof curtain in a backfilling area;
(4) when the strength of the waterproof curtain stirring piles in the two adjacent first hole guiding groove sections reaches 50-70%, hole guiding construction is carried out in a second hole guiding groove section between the two adjacent first hole guiding groove sections, the construction mode of the hole guiding construction is the same as that of the first hole guiding groove section in the step (2), and the holes at the two end parts of the second hole guiding groove section are overlapped with the waterproof curtain in the constructed first hole guiding groove section;
(5) and (4) backfilling the hollow area in the second hole guiding groove section by repeating the step (3), and constructing a stirring pile waterproof curtain in the backfilled area after compaction, wherein the stirring pile waterproof curtain of the second hole guiding groove section is connected with the stirring pile waterproof curtain in the first hole guiding groove section with the two sides constructed in advance into a whole.
2. The stirring pile waterproof curtain for filling the deep block stone area in the sea according to claim 1, is characterized in that: the stirring pile reinforcing body (11) is formed by mutually engaging 5-8 rows of cement stirring piles; each stirring water-stopping pile of the stirring pile water-stopping structure (12) is constructed in a two-spraying and two-stirring mode; the mixing pile reinforcing body (11) and the mixing pile water stop structure (12) are constructed by adopting a single-shaft mixing pile machine or a multi-shaft mixing pile machine in a sleeving or overlapping mode.
3. The stirring pile waterproof curtain for filling the deep block stone area in the sea according to claim 1, is characterized in that: the length of the hole guiding groove section is 3-6 m, and the width of the superposition between the two adjacent rotary drilling rig guiding holes (13) is larger than the diameter of a single stirring water stopping pile of the stirring pile water stopping structure (12); and a plain concrete pile supplementing structure (17) is arranged on the outer side of the connecting gap of the mixing pile water stopping structure (12) of the adjacent hole guiding groove sections.
4. The stirring pile waterproof curtain for filling the deep block stone area in the sea according to claim 1, is characterized in that: after the hole guiding, backfilling and stirring water stopping pile construction of the two spaced hole guiding groove sections is completed and the strength of the stirring water stopping pile reaches 50-70%, the hole guiding, backfilling and stirring water stopping pile construction of the hole guiding groove section area between the two spaced hole guiding groove sections are performed.
5. The stirring pile waterproof curtain for filling the deep block stone area in the sea according to claim 1, is characterized in that: after the construction in the step (5) is completed, constructing a single or a plurality of plain concrete cast-in-place piles by adopting C15 concrete doped with an expanding agent on one side, far away from the foundation pit supporting structure, of the connecting part of the stirring pile waterproof curtain of the second lead-hole groove and the stirring pile waterproof curtain of the first lead-hole groove section constructed in advance, wherein the lap joint thickness of the single or the plurality of plain concrete cast-in-place piles and the stirring pile waterproof curtain is 8-12 cm, and the pile length of the single or the plurality of plain concrete cast-in-place piles is equal to that of the stirring pile waterproof curtain; when a single plain concrete cast-in-place pile is adopted, the diameter of the pile is larger than or equal to 1200 mm; when a plurality of plain concrete cast-in-place piles are adopted, the diameter of each plain concrete cast-in-place pile is equivalent to that of the mixing pile waterproof curtain, and the plain concrete cast-in-place piles are mutually lapped.
6. The stirring pile waterproof curtain for filling the deep block stone area in the sea is characterized in that: and (2) reinforcing the stirring piles in the step (1) by using 5-8 rows of cement stirring piles constructed along the axis direction of the foundation pit, immediately constructing the second row of stirring piles after the construction of each row of stirring piles is finished, and interlocking adjacent stirring piles with each other until the stirring depth of each row of stirring piles reaches the top surface of a stone layer.
7. The stirring pile waterproof curtain for filling the deep block stone area in the sea is characterized in that: when the rotary drilling rig is adopted for hole guiding in the step (2), simultaneously adopting a slurry retaining wall, stopping drilling after the drilling is carried out to the designed depth, pulling out a drill rod from the hole, and taking out the rock block, wherein the width of mutual coincidence between every two adjacent guide holes in each guide hole groove section is larger than the diameter of a single stirring pile of the waterproof curtain; the performance indexes of the wall protection slurry are as follows: the mud proportion is 1.05-1.20 r, the viscosity is less than 28s, the sand content is less than 8%, the colloid content is greater than 96%, the water loss rate is less than or equal to 25ml/30min, and the pH value is 7-10.
8. The stirring pile waterproof curtain for filling the deep block stone area in the sea is characterized in that: the backfilling in the step (3) adopts layered backfilling, the backfilling depth of each layer is 1.5-2.5 m, the backfilling of each layer is compacted by a rotary drilling rig, and the next layer of backfilling work is carried out; the construction and backfill work of each guide hole groove section is controlled within 24 hours.
9. The stirring pile waterproof curtain for filling the deep block stone area in the sea is characterized in that: the stirring pile waterproof curtain in the step (3) and the step (5) is formed by constructing a three-axis stirring pile, a two-spraying and two-stirring mode is adopted in the construction process, the cement mixing amount is controlled to be 25% -35%, and the water cement ratio is 1.0-1.2.
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| CN112442991B (en) * | 2020-11-20 | 2021-09-07 | 中国长江三峡集团有限公司 | Method for supporting foundation pit under condition of stone block included in soil layer |
| CN112459045A (en) * | 2020-12-01 | 2021-03-09 | 南京深地智能建造技术研究院有限公司 | Construction process of rotary digging hole-forming construction method pile |
| CN113107370B (en) * | 2021-04-13 | 2022-09-20 | 山东建勘集团有限公司 | Drilling tool for cement-soil mixing pile between rigid piles and using method thereof |
| CN113502863B (en) * | 2021-08-11 | 2022-12-06 | 中建三局绿色产业投资有限公司 | Foundation ditch vertical road excavation device for construction |
| CN114703881A (en) * | 2022-04-18 | 2022-07-05 | 山西建筑工程集团有限公司 | Construction method of waterproof curtain containing confined water hard stratum and triaxial mixing pile device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1257569A (en) * | 1969-03-13 | 1971-12-22 | ||
| RU46775U1 (en) * | 2005-01-24 | 2005-07-27 | Общество с ограниченной ответственностью "Татнефть-Бурение" (ООО "ТН-Бурение") | SEDIMENT FOR HYDROINSULATION OF LAND BARNES IN STONE SOILS |
| CN101761083A (en) * | 2008-12-24 | 2010-06-30 | 上海市基础工程公司 | Underground continuous wall obstacle clearing construction method for traversing ultra-thick obstacle |
| CN202672093U (en) * | 2012-05-23 | 2013-01-16 | 中交第三航务工程勘察设计院有限公司 | Anchoring type dock wall structure of sheet-pile wall |
| CN104695458A (en) * | 2013-12-04 | 2015-06-10 | 中国人民解放军总装备部特种工程技术安装总队 | Construction method of deep stirring and jet grouting compound pile waterproof curtain |
-
2019
- 2019-07-26 CN CN201910680389.1A patent/CN110424434B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1257569A (en) * | 1969-03-13 | 1971-12-22 | ||
| RU46775U1 (en) * | 2005-01-24 | 2005-07-27 | Общество с ограниченной ответственностью "Татнефть-Бурение" (ООО "ТН-Бурение") | SEDIMENT FOR HYDROINSULATION OF LAND BARNES IN STONE SOILS |
| CN101761083A (en) * | 2008-12-24 | 2010-06-30 | 上海市基础工程公司 | Underground continuous wall obstacle clearing construction method for traversing ultra-thick obstacle |
| CN202672093U (en) * | 2012-05-23 | 2013-01-16 | 中交第三航务工程勘察设计院有限公司 | Anchoring type dock wall structure of sheet-pile wall |
| CN104695458A (en) * | 2013-12-04 | 2015-06-10 | 中国人民解放军总装备部特种工程技术安装总队 | Construction method of deep stirring and jet grouting compound pile waterproof curtain |
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