CN112392400A - Hole forming construction process for slope protection pile in complex geological environment - Google Patents
Hole forming construction process for slope protection pile in complex geological environment Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000005553 drilling Methods 0.000 claims abstract description 174
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 239000002689 soil Substances 0.000 claims description 150
- 230000001681 protective effect Effects 0.000 claims description 25
- 230000002787 reinforcement Effects 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003673 groundwater Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000011148 porous material Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 238000009412 basement excavation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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Abstract
The application relates to a complex geological environment slope protection pile pore-forming construction process, which belongs to the technical field of foundation construction and comprises the following steps: dividing the poor stratum layer into N layers; drilling holes layer by layer, pouring plain concrete into the drilled holes, and performing secondary drilling on a concrete layer after the strength of the plain concrete meets the requirement to form pile holes at the layer position; and (5) cleaning holes, and preparing for the next pile-forming construction. This application utensil adopts the method pore-forming of concrete layering dado, has avoided adopting the problem that the hole collapses appears easily when traditional mode pore-forming, and especially has more obvious effect under the condition of groundwater in the miscellaneous fill layer.
Description
Technical Field
The application relates to the field of foundation construction, in particular to a hole forming construction process for a slope protection pile in a complex geological environment.
Background
With the construction development of urban high-rise buildings, the corresponding deep foundation pit excavation and supporting technology is correspondingly improved. Under the condition that the effective width working face of the foundation pit slope is not enough, the edge of the foundation pit is supported by adopting a slope protection pile mode, so that the slope collapse is prevented. The revetment piles are also called row piles, and usually adopt a drilling machine to form holes at one time.
However, due to the influence of human activities, the foundation of many engineering constructions is often not an undisturbed soil layer but a miscellaneous filling soil after backfilling. The soil is often loose due to different filler materials, greatly different particle sizes and different pore sizes among particles. When carrying out the bank protection stake pore-forming in miscellaneous fill layer, though have higher pore-forming efficiency, the in-process pore wall of drilling collapses easily, and the stability of the pore wall after the pore-forming is relatively poor, and the soil block that drops can cause the problem of mixed dregs in the bank protection stake body of pile under the in-process of putting steel reinforcement cage and concreting.
Disclosure of Invention
In order to avoid the problem that the pore wall collapses after bank protection stake pore-forming in-process and pore-forming, this application provides a complicated geological environment bank protection stake pore-forming construction technology.
On the one hand, the application provides a complicated geological environment protects stake pore-forming construction technology adopts following technical scheme:
a hole forming construction process for a slope protection pile in a complex geological environment comprises the following steps:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, pouring plain concrete into the first drill hole to form a first concrete layer, drilling in the first concrete layer by using a rotary drilling rig after the strength of the plain concrete meets the requirement, wherein the drilling depth is not less than the thickness of the first concrete layer to form the pile hole of the first soil layer, and a first protective wall layer is formed around the pile hole;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, continuously drilling to form a drill hole of a lower soil layer after the pile holes of the upper soil layer are formed by using a rotary drilling bit, then pouring plain concrete into the drill hole to form a concrete layer, drilling on the concrete layer by using the rotary drilling bit after the strength of the plain concrete meets the requirement, and the drilling depth is not less than the thickness of the concrete layer;
constructing layer by layer from the second soil layer to the Nth soil layer, drilling on the concrete layer by using a rotary drilling bit after the strength of plain concrete in the Nth soil layer meets the requirement, and continuing to drill downwards after the rotary drilling bit penetrates through the concrete layer until the designed depth is reached;
and S4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform post-pile forming construction.
Through adopting above-mentioned technical scheme, adopt successive layer drilling in bad ground, pour, the mode of secondary drilling, can enough guarantee not take place to collapse at the pore wall of the in-process top soil layer of drilling downwards, also can guarantee that the pore wall in whole stake hole is the concrete dado of pouring behind the pore-forming, thereby make and form the pile-forming in-process and transfer the steel reinforcement cage in the later stage and do not have when pouring the pile body miscellaneous fill piece and fall into the stake downthehole, no sediment soil is mixed in the pile body, guarantee the quality of pouring of pile body.
Preferably, when the drilling of the Nth soil layer is carried out, the depth of the rotary drilling bit into the lower normal stratum is not less than 500 mm.
By adopting the technical scheme, after the concrete layer is poured on the drilled hole on the Nth layer, the junction of the poor stratum and the normal stratum is filled with concrete, and the pile hole at the junction can form a stable retaining wall.
Preferably, in S3, when the hole in the lower soil layer is subjected to plain concrete placement, the liquid level of the concrete is 100 to 150mm higher than the bottom surface of the upper soil layer.
By adopting the technical method, an overlapping section can be formed between the concrete retaining walls of the upper soil layer and the lower soil layer, particles of the soil layer or underground water are blocked, and the phenomenon that the underground water enters the pile hole to influence the later pile-forming operation construction is avoided.
Preferably, when the layer division is carried out, the thickness of each layer is 1-1.5 m.
By adopting the technical scheme, the rotary drilling rig is easier to drill and construct every time.
On the other hand, the hole forming construction process for the slope protection pile in the complex geological environment adopts the following technical scheme:
a hole forming construction process for a slope protection pile in a complex geological environment comprises the following steps:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, and then putting down a first pile casing, wherein the outer diameter of the first pile casing is smaller than the diameter of the first drill hole, so that a space is formed between the outer wall of the first pile casing and the hole wall of the first drill hole; then pouring plain concrete between the first casing and the hole wall of the first drill hole to form a first layer of retaining wall; when the strength of the plain concrete meets the requirement, the first pile casings are recovered, and pile holes of a first soil layer are formed between the first layer of retaining walls;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, drilling the holes in the upper soil layer and the lower soil layer by using a rotary drilling bit, and then lowering a pile casing, wherein a space is reserved between the outer wall of the pile casing and the wall of each drilled hole; pouring plain concrete between the pile casing and the wall of the drilled hole, recovering the pile casing after the strength of the plain concrete meets the requirement and the pile casing is formed,
constructing layer by layer from the second soil layer to the Nth soil layer, recovering the Nth pile casing after the strength of the plain concrete in the Nth soil layer meets the requirement, and then continuing to drill downwards by using a rotary drilling bit until the design depth is reached;
s4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage for post pile forming construction;
the diameters of all the casings are reduced from top to bottom in sequence.
By adopting the technical scheme, the modes of drilling, lowering the pile casing, pouring concrete and recovering the pile casing layer by layer are adopted in the bad stratum to form the concrete retaining wall of each layer of pile hole, so that the problem of hole collapse in the hole forming process is solved, and the stability of the pile hole in the later pile forming process is also ensured.
Preferably, in S3, the bottom end of the downward casing is inserted into the lower soil layer by 100-150 mm, and the top end of the downward casing is 100-120 mm higher than the bottom surface of the upper soil layer.
By adopting the technical method, concrete is prevented from flowing into the pile hole from the lower part of the pile casing when the concrete is poured, and meanwhile, the upper concrete retaining wall and the lower concrete retaining wall can be overlapped.
Preferably, the outer walls of all the casings are coated with a release agent.
By adopting the technical method, the friction force between the pile casing and the concrete layer is reduced, and the pile casing is convenient to lift and recover.
In a third aspect, the application provides a complex geological environment slope protection pile hole forming construction process, which adopts the following technical scheme:
a hole forming construction process for a slope protection pile in a complex geological environment comprises the following steps:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, then putting a first protective cylinder down, attaching the outer wall of the first protective cylinder to the hole wall of the first drill hole, and enabling the first protective cylinder to play a role of temporary wall protection;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, drilling the holes in the upper soil layer by using a rotary drilling bit to form drill holes in the lower soil layer, then lowering a pile casing, attaching the outer wall of the pile casing to the wall of the drill hole,
constructing layer by layer from the second soil layer to the Nth soil layer, and after the pile casing of the Nth layer is completely lowered, continuing to drill downwards by using a rotary drilling bit until the design depth is reached;
and S4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform post-pile forming construction.
By adopting the technical method, the temporary retaining wall of the pile hole of the slope protection pile is formed by drilling and lowering the retaining cylinder layer by layer in the bad stratum, so that hole collapse is avoided, and pile forming operation is performed by grouting layer by layer and recovering the retaining cylinder layer by layer after the reinforcement cage is lowered at the later stage.
Preferably, in S3, the bottom end of the downward casing is inserted into the lower soil layer by 100-150 mm, and the top end of the downward casing is 100-120 mm higher than the bottom surface of the upper soil layer.
By adopting the technical method, an overlapped part is formed between the pile casings of the upper soil layer and the lower soil layer, the hole walls are completely blocked, and underground water and soil layer particles are prevented from falling into pile holes.
Preferably, the undesirable formation is a miscellaneous fill.
By adopting the technical method, as the components of the miscellaneous fill layer are complex and the compactness is poor, hole collapse easily occurs by adopting the traditional hole forming mode, and the problem of difficult hole forming caused by the development of underground water is easier, and the construction method can effectively solve the problem of hole collapse of miscellaneous fill.
To sum up, the part that miscellaneous bank filling layer was passed in slope protection stake hole of this application adopts the method pore-forming of concrete layering dado, has avoided appearing the problem of collapsing the hole when adopting traditional mode pore-forming easily, and especially to the effect under the condition that has groundwater in the miscellaneous bank filling layer more obvious.
Drawings
Fig. 1 is a flowchart of a complex geological environment slope protection pile hole forming construction process according to a first embodiment of the application;
FIG. 2 is a construction structure diagram of the complex geological environment slope protection pile hole-forming construction process;
FIG. 3 is a flowchart of a complex geological environment slope protection pile hole forming construction process according to the second embodiment of the present application;
FIG. 4 is a flowchart of a complex geological environment slope protection pile hole forming construction process according to a third embodiment of the present application;
fig. 5 is a construction structure diagram of a hole forming construction process of a complex geological environment slope protection pile according to a third embodiment of the present application.
Description of reference numerals: 1. a miscellaneous fill layer; 2. the first layer of protective wall.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a hole forming construction process for a slope protection pile in a complex geological environment. In the hole forming process of the slope protection pile in the embodiment, the mixed filling layer 1 with the thickness of 10m needs to pass through, and underground water appears in the mixed filling layer 1. Because the components of the miscellaneous fill layer 1 are complex and the compactness is poor, hole collapse easily occurs by adopting a traditional hole forming mode, and the problem of difficult hole forming is easily caused by the development of underground water, thereby affecting the progress of engineering.
Example one
Referring to fig. 1 and 2, the hole forming construction process of the slope protection pile in the complex geological environment comprises the following steps;
s1 dividing to-be-formed soil layer positions of slope protection piles
The horizon division is carried out according to the thickness of the miscellaneous fill layer 1, the miscellaneous fill layer 1 with the thickness of 10m is divided into N layers from top to bottom according to the thickness of 1.5m of each layer, the value of N in the embodiment is 7, the thickness of 1-6 layers is 1.5m, and the thickness of the lowest layer is 1 m.
And measuring and setting out, determining the position of the pile hole of the slope protection pile on the ground, marking the serial number, and drilling according to the sequence of the serial number during hole forming operation.
In this embodiment, a dry hole forming method is adopted. The drilling machine is in place, the drilling machine adopts rotary drilling bits, the number of the rotary drilling bits is 8, the rotary drilling bits are marked according to the sequence of 1-8, and the diameters of the rotary drilling bits are reduced according to the increase of the sequence.
S2, forming a hole by a first soil layer pile hole
S21, forming a hole in a first soil layer
And (3) installing the No. 1 rotary drilling bit on the rotary drilling rig, vertically drilling downwards for 1.5m on the surface of the miscellaneous fill layer 1 to reach the top surface of the second soil layer to form a first drilling hole, wherein the length of the first drilling hole is equal to the thickness of the first soil layer.
S22, pouring concrete
Plain concrete is poured into the first borehole, and in the embodiment, the plain concrete is C20 concrete. Plain concrete is filled in the first drilled hole and the holes on the hole wall are filled to form a first concrete layer. And waiting for plain concrete solidification after the plain concrete pouring is finished.
S23, pile hole forming
And when the strength of the plain concrete reaches more than 10MP and meets the standard of concrete retaining walls, drilling at the center of the first concrete layer by using a No. 2 rotary drilling bit, wherein a pile hole of the first concrete layer is formed by the drilling depth of 1.5m, and a first layer of retaining wall 2 is formed around the pile hole.
S3, forming hole of n-th soil layer pile hole (n is two to six)
Continuously drilling downwards after the pile hole of the upper layer soil layer is formed by using an n number rotary drilling bit, wherein the drilling depth is 1.5m, and the drilling depth reaches the top surface of the lower layer soil layer to form an nth drilled hole; and pouring plain concrete into the nth drilled hole, wherein the liquid level of the plain concrete is 100mm higher than the bottom surface of the upper soil layer to form an nth concrete layer. And waiting for plain concrete solidification after the plain concrete pouring is finished. The overlapping section with the length of 100mm exists between the upper concrete layer and the lower concrete layer, so that seamless combination between the upper concrete layer and the lower concrete layer is ensured, underground water in miscellaneous filling soil is blocked, and the phenomenon that the underground water enters a pile hole to influence later-stage pile-forming operation construction is avoided.
And when the strength of the plain concrete reaches more than 10MP and meets the standard of concrete wall protection, drilling at the center of the nth concrete layer by using an n +1 number rotary drilling bit, wherein a pile hole of the nth concrete layer is formed at the drilling depth of 1.5m, and the nth wall protection is formed around the pile hole.
And repeating the steps from the second soil layer to the sixth soil layer by layer until a pile hole of the sixth soil layer is formed by drilling with the No. 7 rotary drilling bit.
During the drilling process, the centers of all the drill holes and the pile holes are ensured to be positioned on the same vertical straight line.
S4, forming holes in the seventh soil layer pile hole
S41, forming holes in the seventh soil layer
And (4) continuing drilling downwards when the No. 7 rotary drilling bit is used for drilling to the top surface of the seventh soil layer until the seventh soil layer is drilled and then the undisturbed soil layer or rock stratum below is drilled by 500mm, and stopping drilling to form a seventh drilled hole.
S42, pouring concrete
And pouring plain concrete into the seventh drilled hole, wherein the liquid level of the plain concrete is 100mm higher than the bottom surface of the pile hole of the sixth soil layer, so as to form a seventh concrete layer. And waiting for plain concrete solidification after the plain concrete pouring is finished. The seventh concrete layer extends 100mm deep into the underlying ground layer. Because the concrete layer is poured downwards into the undisturbed soil layer or the rock stratum, the hole wall strength of the junction of the miscellaneous fill layer and the lower stratum is ensured.
S43, pile hole forming
And when the strength of the plain concrete reaches more than 10MP and meets the standard of concrete wall protection, drilling by using a No. 8 rotary drilling bit at the center of the seventh concrete layer until the drilling reaches the designed depth.
The diameter of the pile hole of all the layers is reduced from top to bottom layer by layer.
S5, cleaning holes
And (4) cleaning holes, finishing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform pile forming construction in the later period.
Through the mode that adopts successive layer drilling, pour, secondary drilling in miscellaneous fill soil layer, can enough guarantee not take place to collapse at the pore wall of the in-process top soil layer of drilling downwards, also can guarantee that the pore wall in whole stake hole is the concrete dado of pouring behind the pore-forming to make and not have miscellaneous fill piece and fall into the stake downthehole when later stage becomes the stake in-process and transfers the steel reinforcement cage and pour the stake body, no dregs soil in the stake body mixes, guarantees the quality of pouring of stake body.
Meanwhile, the concrete retaining wall can also block underground water in the miscellaneous filling soil, so that the influence of the underground water entering the pile hole on pile forming construction is avoided.
Example two
Referring to fig. 2 and 3, the hole forming construction process of the slope protection pile in the complex geological environment comprises the following steps;
s1 dividing to-be-formed soil layer positions of slope protection piles
And performing layer position division according to the thickness of the miscellaneous fill layer 1, dividing the miscellaneous fill layer 1 with the thickness of 10m into 7 layers from top to bottom according to the thickness of 1.5m of each layer, wherein the thicknesses of 1-6 layers are 1.5m, and the thickness of the lowest layer is 1 m.
And measuring and setting out, determining the position of the pile hole of the slope protection pile on the ground, marking the serial number, and drilling according to the sequence of the serial number during hole forming operation.
In this embodiment, a dry hole forming method is adopted. The drilling machine is in place, the drilling machine adopts rotary drilling bits, the number of the rotary drilling bits is 8, the rotary drilling bits are marked according to the sequence of 1-8, and the diameters of the rotary drilling bits are reduced according to the increase of the sequence.
S2, forming a hole by a first soil layer pile hole
S21, forming a hole in a first soil layer
And (3) installing the No. 1 rotary drilling bit on the rotary drilling rig, vertically drilling downwards for 1.5m on the surface of the miscellaneous fill layer 1 to reach the top surface of the second soil layer to form a first drilling hole, wherein the length of the first drilling hole is equal to the thickness of the first soil layer.
S22, lowering the first protective sleeve
And (5) placing a first protective cylinder in the first drill hole, and inserting the bottom end of the first protective cylinder into the second soil layer by 100 mm. In this example, the release agent was applied to the outer walls of all the casing. The outer diameter of the first casing is smaller than the first bore diameter so that a space is formed between the outer wall of the first casing and the wall of the first bore.
S23, pouring concrete
Plain concrete, in this embodiment C20 concrete, is poured between the first casing and the wall of the first borehole. And forming a first layer of protective wall 2 after the plain concrete is solidified. The strength of the plain concrete reaches more than 10 MP.
S24, recovery of pile casing
And lifting the first pile casings, wherein pile holes of a first soil layer are formed between the first layer of protective walls 2.
S3, forming hole of n-th soil layer pile hole (n is two to six)
Drilling by using an n number rotary drilling bit after the pile hole of the upper layer soil layer is formed, wherein the drilling depth is 1.5m and reaches the top surface of the lower layer soil layer to form an nth drilled hole; and (5) putting the nth casing into the nth drilling hole. The top end of the nth casing is 100mm higher than the bottom surface of the upper soil layer, and the bottom end of the nth casing is inserted into the lower soil layer by 100 mm. The outer diameter of the nth casing is smaller than the diameter of the nth bore hole so as to form a space between the outer wall of the nth casing and the wall of the nth bore hole.
And pouring plain concrete between the nth casing and the hole wall of the nth drill hole. And forming the nth layer of protective wall after the concrete is solidified. The strength of the plain concrete reaches more than 10 MP.
And lifting the nth pile casing, wherein pile holes of the nth soil layer are formed between the nth layer of protective walls.
And repeating the steps from the second soil layer to the sixth soil layer by layer.
S4, forming holes in the seventh soil layer pile hole
S41, forming holes in the seventh soil layer
And (4) drilling downwards from the top surface of the seventh soil layer by using a No. 7 rotary drilling bit until the seventh soil layer is drilled and then the original soil layer or the rock stratum below the seventh soil layer is drilled by 500mm, and stopping drilling to form a seventh drilled hole.
S42 downward seventh protective sleeve
And (5) putting a seventh pile casing in the seventh drilled hole, wherein the top end of the seventh pile casing is 100mm higher than the bottom surface of the upper soil layer. The outer diameter of the seventh casing is smaller than the diameter of the seventh bore hole so that a space is formed between the outer wall of the seventh casing and the wall of the bore hole.
S43, pouring concrete
And pouring plain concrete between the first pile casing and the hole wall of the first drill hole, and forming a seventh layer of retaining wall after the plain concrete is solidified. The strength of the plain concrete reaches more than 10 MP.
S44, recovery of pile casing
And lifting the seventh pile casing, wherein pile holes of a seventh soil layer are formed between the seventh protecting walls.
And after the pile hole of the seventh soil layer is formed, drilling by using a No. 8 rotary drilling bit until the pile hole reaches the designed depth.
The diameter of the pile hole of all soil layers is reduced from top to bottom layer by layer. The diameters of all the pile casings are reduced from top to bottom layer by layer.
S5, cleaning holes
And (4) cleaning holes, finishing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform pile forming construction in the later period.
The mode of drilling, placing the pile casing, pouring concrete and recovering the pile casing layer by layer is adopted in the miscellaneous fill layer to form the concrete retaining wall of each layer of pile hole, so that the problem of hole collapse in the hole forming process is solved, and the stability of the pile hole in the later pile forming process is also ensured.
The part that the slope protection stake hole of embodiment one and embodiment two of this application passed miscellaneous fill layer adopts the method pore-forming of concrete layering dado, has avoided appearing the problem of collapsing easily when adopting traditional mode pore-forming, and especially to the effect under the condition that has groundwater in the miscellaneous fill layer more obvious.
EXAMPLE III
Referring to fig. 4 and 5, the hole forming construction process of the slope protection pile in the complex geological environment comprises the following steps;
s1 dividing to-be-formed soil layer positions of slope protection piles
The horizon division is carried out according to the thickness of the miscellaneous fill layer 1, the miscellaneous fill layer 1 with the thickness of 10m is divided into N layers from top to bottom according to the thickness of 1.5m of each layer, the value of N in the embodiment is 7, the thickness of 1-6 layers is 1.5m, and the thickness of the lowest layer is 1 m.
And measuring and setting out, determining the position of the pile hole of the slope protection pile on the ground, marking the serial number, and drilling according to the sequence of the serial number during hole forming operation.
In this embodiment, a dry hole forming method is adopted. The drilling machine is in place, the drilling machine adopts rotary drilling bits, the number of the rotary drilling bits is 8, the rotary drilling bits are marked according to the sequence of 1-8, and the diameters of the rotary drilling bits are reduced according to the increase of the sequence.
S2, forming a hole by a first soil layer pile hole
S21, forming a hole in a first soil layer
And (3) installing the No. 1 rotary drilling bit on the rotary drilling rig, vertically drilling downwards for 1.5m on the surface of the miscellaneous fill layer 1 to reach the top surface of the second soil layer to form a first drilling hole, wherein the length of the first drilling hole is equal to the thickness of the first soil layer.
S22, lowering the first protective sleeve
And (5) placing a first protective cylinder in the first drill hole, and inserting the bottom end of the first protective cylinder into the second soil layer by 100 mm. The outer wall of the first casing is attached to the hole wall of the first drilled hole. Pile holes of a first soil layer are formed in the first pile casings, and the first pile casings play a role of temporary wall protection.
S3, forming hole of n-th soil layer pile hole (n is two to six)
Drilling by using an n number rotary drilling bit after the pile hole of the upper layer soil layer is formed, wherein the drilling depth is 1.5m and reaches the top surface of the lower layer soil layer to form an nth drilled hole; and (5) putting the nth casing into the nth drilling hole. The top end of the nth casing is higher than the bottom surface of the upper soil layer by 100mm and is attached to the inner wall of the upper casing, and the bottom end of the nth casing is inserted into the lower soil layer by 100 mm. The outer wall of the nth casing is attached to the hole wall of the nth drill hole. Pile holes of the nth soil layer are formed in the nth pile casing, and the nth pile casing plays a role of temporary wall protection.
And repeating the steps from the second soil layer to the sixth soil layer by layer.
S4, forming holes in the seventh soil layer pile hole
S41, forming holes in the seventh soil layer
And (4) drilling downwards from the top surface of the seventh soil layer by using a No. 7 rotary drilling bit until the seventh soil layer is drilled and then the original soil layer or the rock stratum below the seventh soil layer is drilled by 500mm, and stopping drilling to form a seventh drilled hole.
S42 downward seventh protective sleeve
And (5) placing a 7 th protective cylinder in the seventh drilled hole, wherein the top end of the 7 th protective cylinder is 100mm higher than the bottom surface of the upper soil layer. The outer wall of the 7 th protective cylinder is attached to the hole wall of the 7 th drilled hole. Pile holes of a 7 th soil layer are formed in the 7 th pile casings, and the 7 th pile casings play a role of temporary wall protection.
And after the pile hole of the seventh soil layer is formed, drilling by using a No. 8 rotary drilling bit until the pile hole reaches the designed depth.
The diameters of all the pile casings are reduced from top to bottom layer by layer.
S5, cleaning holes
And (4) cleaning holes, finishing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform pile forming construction in the later period.
The temporary retaining wall of the pile hole of the slope protection pile is formed by drilling and lowering the retaining cylinder layer by layer in the miscellaneous fill layer, so that hole collapse is avoided, and pile forming operation is performed by adopting a mode of grouting layer by layer and recovering the retaining cylinder layer by layer after a reinforcement cage is lowered at the later stage.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The hole forming construction process for the slope protection pile in the complex geological environment is characterized by comprising the following steps of:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, pouring plain concrete into the first drill hole to form a first concrete layer, drilling in the first concrete layer by using a rotary drilling rig after the strength of the plain concrete meets the requirement, wherein the drilling depth is not less than the thickness of the first concrete layer to form the pile hole of the first soil layer, and a first protective wall layer is formed around the pile hole;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, continuously drilling to form a drill hole of a lower soil layer after the pile holes of the upper soil layer are formed by using a rotary drilling bit, then pouring plain concrete into the drill hole to form a concrete layer, drilling on the concrete layer by using the rotary drilling bit after the strength of the plain concrete meets the requirement, and the drilling depth is not less than the thickness of the concrete layer;
constructing layer by layer from the second soil layer to the Nth soil layer, drilling on the concrete layer by using a rotary drilling bit after the strength of plain concrete in the Nth soil layer meets the requirement, and continuing to drill downwards after the rotary drilling bit penetrates through the concrete layer until the designed depth is reached;
and S4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage to perform post-pile forming construction.
2. The complex geological environment slope protection pile hole forming construction process according to claim 1, characterized in that: when the hole is drilled in the Nth soil layer, the depth of the rotary drilling bit into the normal stratum below is not less than 500 mm.
3. The complex geological environment slope protection pile hole forming construction process according to claim 1, characterized in that: in S3, when plain concrete is poured into the drilled hole in the lower soil layer, the liquid level of the concrete is 100-150 mm higher than the bottom surface of the upper soil layer.
4. The complex geological environment slope protection pile hole forming construction process according to claim 1, characterized in that: when the layer division is carried out, the thickness of each layer is 1-1.5 m.
5. The hole forming construction process for the slope protection pile in the complex geological environment is characterized by comprising the following steps of:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, and then putting down a first pile casing, wherein the outer diameter of the first pile casing is smaller than the diameter of the first drill hole, so that a space is formed between the outer wall of the first pile casing and the hole wall of the first drill hole; then pouring plain concrete between the first casing and the hole wall of the first drill hole to form a first layer of retaining wall; when the strength of the plain concrete meets the requirement, the first pile casings are recovered, and pile holes of a first soil layer are formed between the first layer of retaining walls;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, drilling the holes in the upper soil layer and the lower soil layer by using a rotary drilling bit, and then lowering a pile casing, wherein a space is reserved between the outer wall of the pile casing and the wall of each drilled hole; pouring plain concrete between the pile casing and the wall of the drilled hole, recovering the pile casing after the strength of the plain concrete meets the requirement and the pile casing is formed,
constructing layer by layer from the second soil layer to the Nth soil layer, recovering the Nth pile casing after the strength of the plain concrete in the Nth soil layer meets the requirement, and then continuing to drill downwards by using a rotary drilling bit until the design depth is reached;
s4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage for post pile forming construction;
the diameters of all the casings are reduced from top to bottom in sequence.
6. The complex geological environment slope protection pile hole forming construction process according to claim 5, characterized in that: in S3, the bottom end of the downward pile casing is inserted into the lower soil layer by 100-150 mm, and the top end of the downward pile casing is 100-120 mm higher than the bottom surface of the upper soil layer.
7. The complex geological environment slope protection pile hole forming construction process according to claim 5, characterized in that: the outer walls of all the protective cylinders are coated with release agent.
8. The hole forming construction process for the slope protection pile in the complex geological environment is characterized by comprising the following steps of:
s1, dividing the poor stratum into N layers from top to bottom according to the thickness of the poor stratum; measuring and setting out, and determining the positions and construction serial numbers of all slope protection pile holes; placing the rotary drilling rig in place, preparing N +1 rotary drilling bits and marking, reducing the diameters of the rotary drilling bits according to sequential increase, and drilling by adopting the rotary drilling bits with the sequentially reduced diameters during drilling;
s2, forming a first soil layer pile hole, drilling in a first soil layer by using a rotary drilling bit to form a first drill hole, then putting a first protective cylinder down, attaching the outer wall of the first protective cylinder to the hole wall of the first drill hole, and enabling the first protective cylinder to play a role of temporary wall protection;
s3, forming holes in pile holes of 2-N soil layers, wherein N is not less than 2, drilling the holes in the upper soil layer by using a rotary drilling bit to form drill holes in the lower soil layer, then lowering a pile casing, attaching the outer wall of the pile casing to the wall of the drill hole,
constructing layer by layer from the second soil layer to the Nth soil layer, and after the pile casing of the Nth layer is completely lowered, continuing to drill downwards by using a rotary drilling bit until the design depth is reached;
s4, cleaning holes, completing hole forming operation of the slope protection pile, and lowering a reinforcement cage for post pile forming construction;
the diameters of all the casings are reduced from top to bottom in sequence.
9. The complex geological environment slope protection pile hole forming construction process according to claim 8, characterized in that: in S3, the bottom end of the downward pile casing is inserted into the lower soil layer by 100-150 mm, and the top end of the downward pile casing is 100-120 mm higher than the bottom surface of the upper soil layer.
10. The complex geological environment slope protection pile hole forming construction process according to any one of claims 1-9, characterized in that: the unfavorable stratum is a backfill soil layer.
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