CN115492519A - Rotary excavating hole-forming construction method for combined rectangular-section reinforced concrete pile - Google Patents
Rotary excavating hole-forming construction method for combined rectangular-section reinforced concrete pile Download PDFInfo
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- CN115492519A CN115492519A CN202110676752.XA CN202110676752A CN115492519A CN 115492519 A CN115492519 A CN 115492519A CN 202110676752 A CN202110676752 A CN 202110676752A CN 115492519 A CN115492519 A CN 115492519A
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- 238000010276 construction Methods 0.000 title claims abstract description 34
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 84
- 238000009412 basement excavation Methods 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000009966 trimming 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
- E21B7/001—Drilling a non circular hole
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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
- E21B12/00—Accessories for drilling tools
-
- 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
- E21B12/00—Accessories for drilling tools
- E21B12/06—Mechanical cleaning devices
-
- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The invention relates to a rotary excavating and pore-forming construction method for a combined rectangular-section reinforced concrete pile, which comprises the following construction steps of: assembling a square hole drill bit, and installing the square hole drill bit on a driving drill rod; lofting and positioning a side line of the rectangular pile hole, and pouring a concrete retainer; designing a combination mode of drilling operation of the square-hole drill bit, and positioning a central point position of the square-hole drill bit for hole forming; aligning the driving drill rod with the center point of the formed hole, and drilling downwards; lifting the square hole drill bit out of the pile hole, lifting the movable arc-shaped side plate to remove drilling slag in the square hole drill bit, aligning a front guide rod at the bottom end of the driving drill rod to other central point positions or inserting the front guide rod into a guide drilling hole excavated at the previous time, and repeating the steps to perform rotary drilling and cleaning operation of the drilling slag until the square hole drill bit is excavated to the designed depth; and after the rectangular pile hole is excavated, pouring construction of the rectangular reinforced concrete pile is carried out. The square-hole drill bit combination drilling can realize the excavation of rectangular pile holes with different section sizes, and the applicability is strong.
Description
Technical Field
The invention relates to pile hole excavation construction of a reinforced concrete pile with a rectangular cross section, in particular to a combined excavation pore-forming construction method of a rotary drilling bit for a square hole of a rectangular pile hole.
Background
When the pile foundation is constructed, a pile hole is usually excavated, and the pile hole excavated by the existing pile hole excavating equipment is mainly of a circular cross section. For the pile hole with the square cross section, the excavation is mainly carried out in a manual operation mode, the excavation efficiency is low, the construction period is long, and the safety risk is large.
The patent application No. 201711118631.3 discloses a method for quickly forming a hole by using mechanical equipment, namely firstly, excavating a pile hole with a conventional circular section by using the mechanical equipment to form a pilot hole, and then trimming by using a rectangular edger. The method needs a plurality of devices to be matched with each other, and in addition, the soil body scraped from the hole wall needs to be cleaned repeatedly, so that the construction efficiency is low.
The patent of anti-slide pile square hole forming equipment (application number: 202021692933.9) provides square hole forming equipment, a square hole is excavated on a soil body by adopting a Lelo triangle type drill cutter, but the equipment needs to arrange a drill frame and a support at the top of a pile hole to limit the cutting section of the drill cutter, so that the length of the drill cutter needs to be greater than the depth of the pile hole, the depth of the pile hole depends on the length of the drill cutter, and the requirement of deep hole drilling is difficult to meet. The hole forming equipment provided by the technology can only carry out square drilling construction, and is difficult to meet the excavation operation of rectangular section pile holes with different lengths and widths.
Disclosure of Invention
The invention aims to provide a rotary excavating hole-forming construction method for a combined rectangular-section reinforced concrete pile aiming at the problems in the rectangular-section pile hole excavating construction process. In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a rotary excavating and pore-forming construction method for a combined rectangular-section reinforced concrete pile, which comprises the following construction steps of:
And 2, lofting and positioning the side lines of the rectangular pile holes on the ground, and pouring a concrete guard ring along the side lines.
And 3, excavating the rectangular pile hole by adopting a multi-drilling mode, designing a combination mode of drilling operation of the square hole drill according to the size of the rectangular pile hole and the size of the hole formed by the square hole drill, and positioning the central point position of the hole formed by the square hole drill each time.
And 5, after the square hole drill bit is drilled in a rotary drilling mode until the square hole drill bit is filled with drilling slag, lifting the driving drill rod upwards to lift the square hole drill bit out of the pile hole, then lifting the movable arc-shaped side plate upwards to clean the drilling slag from the position between the movable arc-shaped side plate and the fixed arc-shaped side plate, and then lowering the movable arc-shaped side plate to enable the movable arc-shaped side plate to restore to the original position.
And 6, aligning the preposed guide rod at the bottom end of the driving drill rod to other central point positions or inserting the preposed guide rod into a guide drill hole dug at the previous time, and performing rotary drilling and cleaning operation of drilling slag according to the methods in the steps 4 and 5 until the drilling is dug to the designed depth.
And 7, after the rectangular pile hole is excavated, constructing the rectangular reinforced concrete pile, firstly putting a reinforcement cage into the rectangular pile hole, and then pouring concrete into the rectangular pile hole to complete the construction of the rectangular reinforced concrete pile.
Preferably, in the step 1, the square hole drill bit is composed of a rotary drilling wing plate, a central limiting sleeve, a fixed arc-shaped side plate and a movable arc-shaped side plate, the fixed arc-shaped side plate and the movable arc-shaped side plate are formed by splicing three arc-shaped steel plates, the outer contour of the rotary drilling wing plate is matched with the fixed arc-shaped side plate, and the outer contour of the horizontal projection of the fixed arc-shaped side plate, the movable arc-shaped side plate and the rotary drilling wing plate is a Lelo triangle; alloy teeth are arranged at the bottom end of the rotary digging wing plate, and soil bodies are cut through the alloy teeth, so that the square hole drilling and excavating operation is realized.
Preferably, in step 1, a large ring and a small ring are respectively arranged at two ends of the eccentric connection bearing, axes of the large ring and the small ring are mutually deviated, the large ring of the eccentric connection bearing is sleeved on the central limiting sleeve, the small ring of the eccentric connection bearing is sleeved on the driving drill rod, contact surfaces of the eccentric connection bearing, the central limiting sleeve and the driving drill rod are respectively provided with a sealing ring groove and a ball groove, the upper side and the lower side of the ball groove are respectively provided with a sealing ring groove, a sealing ring is arranged in the sealing ring groove, balls are arranged in the ball grooves, the driving drill rod can rotate relative to the eccentric connection bearing, and the central limiting sleeve can rotate relative to the eccentric connection bearing. Make driving drill rod and central spacing sleeve keep eccentric state through eccentric coupling bearing, the external gear of driving drill rod keeps the engaged state with central spacing sleeve's internal gear simultaneously, drives central spacing sleeve through driving drill rod and rotates around the axis eccentricity of driving drill rod, and central spacing sleeve can be self-transmitting relatively self axis simultaneously (namely square hole drill bit rotates around the axis eccentricity of driving drill rod, and square hole drill bit can self-transmit relatively self axis simultaneously). The sealing ring can effectively prevent soil from entering the central limiting sleeve and influencing the meshing state of the internal gear of the central limiting sleeve and the external gear of the driving drill rod.
Preferably, in the step 1, the driving drill rod is of a hollow structure, a grouting channel is arranged in the driving drill rod, a slurry overflow hole is arranged at the lower end of the driving drill rod, and the slurry overflow hole is communicated with the grouting channel; in the step 4, the water or the slurry is injected through the grouting channel and flows out through the slurry overflow hole; and in the drilling process, the driving drill rod is lengthened according to the depth of the pile hole.
Preferably, in the step 1, the ratio of the diameter of the inner gear on the central limiting sleeve to the diameter of the outer gear of the driving drill rod is 4:3, and in the step 4, the motion track of the outer contour of the square hole drill is in a round-corner square shape, and a plurality of round-corner square pile holes are combined to form a rectangular pile hole.
Preferably, in the step 4, the lower end of the front guide rod is provided with a front drill bit, the front guide rod is inserted into soil by cutting soil through the front drill bit, the driving drill rod is guided to keep vertical drilling, the phenomenon that the bottom of the driving drill rod shakes to generate large transverse displacement in the rotation process of the square hole drill bit is avoided, the stability in the drilling process is improved, and meanwhile, the hole forming quality of the square pile hole is improved.
Preferably, in the step 1, the top of the fixed arc-shaped side plate and the bottom of the movable arc-shaped side plate are respectively provided with a tongue and groove, and the tongue and groove of the fixed arc-shaped side plate and the tongue and groove of the movable arc-shaped side plate are engaged with each other; the inner wall of the fixed arc-shaped side plate is provided with a limiting sleeve, the inner wall of the movable arc-shaped side plate is provided with a limiting rod, and the limiting rod is inserted into the limiting sleeve; through the arrangement of the structures such as the rabbet, the limiting sleeve and the limiting rod, the dislocation between the movable arc-shaped side plate and the fixed arc-shaped side plate is avoided.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the technology adopts the square hole drill bit to carry out the pore-forming operation, can effectively improve the construction operation efficiency and improve the safety of the construction operation.
2. The applicability is strong: the square hole drill bit combination drilling can realize the excavation operation of rectangular pile holes with different section sizes.
3. Leading guide bar is on same straight line with the vertical axis of drive drilling, square pile hole, and leading guide bar bores into in advance, can effectively avoid the square hole drill bit to produce transversely rocking at the in-process that creeps into, has guaranteed the pore wall pore-forming quality in square pile hole, avoids appearing the condition that the pore wall was dug excessively.
4. The driving drill rod can be used for carrying out effective transverse limiting on the square hole drill bit, and a limiting frame is not required to be arranged on the ground to limit the square hole drill bit, so that the length of the square hole drill bit is reduced, the friction force between the square hole drill bit and the hole wall is reduced, and the drilling operation efficiency is improved.
5. The driving drill rod can be lengthened, the length of the driving drill rod can be flexibly adjusted according to the depth of a pile hole, and the operation requirement of deep hole drilling is met.
6. The operating mode of drilling is dug soon to the adoption, and the drilling mud is saved in the square hole drill bit, through promoting the activity arc curb plate on the square hole drill bit, can clear up the drilling mud in the square hole drill bit fast, improves the scarfing cinder operating efficiency.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a square-hole rotary drilling bit;
FIG. 2 is a schematic diagram of a three-dimensional structure of a square hole rotary drilling bit (a fixed arc-shaped side plate is not shown);
FIG. 3 is a schematic three-dimensional structure of a drive rod;
FIG. 4 is a schematic three-dimensional structure of the connection of the center sleeve and the driving drill rod;
FIG. 5 isbase:Sub>A cross-sectional view (section A-A in FIG. 4) of the connection of the center sleeve to the drive rod;
FIG. 6 is a three-dimensional half-sectional view of an eccentric link bearing;
FIG. 7 is a schematic three-dimensional view of the connection of the driver blade to the square hole bit (the movable arcuate side plate is not shown);
FIG. 8 is a schematic three-dimensional structure of a movable curved side plate;
FIG. 9 is a schematic view of the butt joint of the fixed arc-shaped side plate and the movable arc-shaped side plate;
FIG. 10 is a schematic diagram of a three-dimensional structure of a square pile rotary drilling bit in place;
FIG. 11 is a schematic illustration of rectangular pile hole concrete retainer construction;
FIG. 12 is a schematic diagram (I) of excavation construction of a rectangular pile hole square hole rotary drilling bit combination;
FIG. 13 is a schematic diagram (II) of excavation construction of a rectangular pile hole square hole rotary drilling bit combination;
FIG. 14 is a schematic diagram illustrating the cleaning of the slag from the square hole rotary drill bit;
fig. 15 is a schematic diagram (three) of combined excavation construction of a rectangular pile hole square hole rotary drilling bit;
FIG. 16 is a top view of the rectangular pile hole square hole rotary drilling bit combination excavation construction;
fig. 17 is a schematic view of a rectangular cross-section reinforced concrete pile;
fig. 18 is a half-sectional view of a three-dimensional structure cast by a combined rectangular-section reinforced concrete slide-resistant pile.
The figure is marked with: 11-rotary digging wing plate, 12-alloy tooth, 13-central limiting sleeve, 14-internal gear, 151-fixed arc side plate, 152-movable arc side plate, 153-rabbet, 154-limiting sleeve, 155-limiting rod, 2-driving drill rod, 21-external gear, 22-preposed guide rod, 23-preposed drill bit, 24-grouting channel, 25-slurry overflow hole, 3-eccentric connecting bearing, 31-sealing ring groove, 32-ball groove, 33-sealing ring, 34-ball, 4-concrete retainer, 41-soil body, 42-drilling slag, 43-guiding drilling hole, 44-rectangular pile hole, 45-rectangular reinforced concrete pile, 46-reinforcement cage and 47-concrete.
Detailed Description
For a better understanding of the present invention, the following embodiments will be described in detail with reference to fig. 1 to 18, and the following embodiments are implemented on the premise of the technical solution of the present invention, and the detailed embodiments are given, but the scope of the present invention is not limited to the following embodiments.
The invention relates to a rotary excavating hole-forming construction method of a combined rectangular-section reinforced concrete pile, which comprises the following construction steps of:
step 1, assembling a square-hole drill bit, as shown in the attached drawings 1 and 2, installing and fixing a rotary-digging wing plate 11 on a central limiting sleeve 13, and installing and fixing a fixed arc-shaped side plate 151 on the outer side of the rotary-digging wing plate 11; as shown in fig. 4 and 5, the driving drill rod 2 is inserted into the central limiting sleeve 13 of the square-hole drill bit, the driving drill rod 2 passes through the central limiting sleeve 13, the external gear 21 on the driving drill rod 2 is meshed with the internal gear 14 of the central limiting sleeve 13, the ratio of the diameter of the internal gear 14 on the central limiting sleeve 13 to the diameter of the external gear 21 of the driving drill rod 2 is 4:3, the eccentric connecting bearings 3 are respectively installed at two ends of the central limiting sleeve 13, one end of each eccentric connecting bearing 3 is rotatably connected with the central limiting sleeve 13, and the other end of each eccentric connecting bearing 3 is rotatably connected with the driving drill rod 2, as shown in fig. 7; the movable arc-shaped side plate 152 is mounted on the fixed arc-shaped side plate 151 as shown in fig. 10.
As shown in fig. 1, fig. 2 and fig. 8, the square hole drill bit is composed of a rotary drilling wing plate 11, a central limiting sleeve 13, a fixed arc-shaped side plate 151 and a movable arc-shaped side plate 152, the fixed arc-shaped side plate 151 and the movable arc-shaped side plate 152 are formed by splicing three arc-shaped steel plates, the outer contour of the rotary drilling wing plate 11 is matched with the fixed arc-shaped side plate 151, and the outer contour of the horizontal projection of the fixed arc-shaped side plate 151, the movable arc-shaped side plate 152 and the rotary drilling wing plate 11 is a prolate triangle; alloy teeth 12 are arranged at the bottom end of the rotary digging wing plate 11, and soil is cut through the alloy teeth 12, so that excavation operation of drilling square holes is realized. As shown in fig. 8 and 9, the top of the fixed arc-shaped side plate 151 and the bottom of the movable arc-shaped side plate 152 are respectively provided with a tongue-and-groove 153, and the fixed arc-shaped side plate 151 and the tongue-and-groove 153 of the movable arc-shaped side plate 152 are engaged with each other; a limiting sleeve 154 is arranged on the inner wall of the fixed arc-shaped side plate 151, a limiting rod 155 is arranged on the inner wall of the movable arc-shaped side plate 152, and the limiting rod 155 is inserted into the limiting sleeve 154; the movable arc-shaped side plate 152 and the fixed arc-shaped side plate 151 are prevented from being dislocated by the arrangement of the tongue-and-groove 153, the limiting sleeve 154, the limiting rod 155 and the like.
As shown in fig. 4 to 6, two ends of the eccentric connection bearing 3 are respectively provided with a large ring and a small ring, axes of the large ring and the small ring are mutually deviated, the large ring of the eccentric connection bearing 3 is sleeved on the central limiting sleeve 13, the small ring of the eccentric connection bearing 3 is sleeved on the driving drill rod 2, contact surfaces of the eccentric connection bearing 3, the central limiting sleeve 13 and the driving drill rod 2 are respectively provided with a sealing ring groove 31 and a ball groove 32, upper and lower sides of the ball groove 32 are respectively provided with a sealing ring groove 31, a sealing ring 33 is arranged in the sealing ring groove 31, a ball 34 is arranged in the ball groove 32, the driving drill rod 2 can rotate relative to the eccentric connection bearing 3, and the central limiting sleeve 13 can rotate relative to the eccentric connection bearing 3. The driving drill rod 2 and the central limiting sleeve 13 are kept in an eccentric state through the eccentric connecting bearing 3, meanwhile, the external gear 21 of the driving drill rod 2 and the internal gear 14 of the central limiting sleeve 13 are kept in a meshed state, the central limiting sleeve 13 is driven to rotate eccentrically around the axis of the driving drill rod 2 through the driving drill rod 2, and meanwhile, the central limiting sleeve 13 can conduct self transmission relative to the axis of the central limiting sleeve 13 (namely, the square hole drill bit rotates eccentrically around the axis of the driving drill rod 2, and meanwhile, the square hole drill bit can conduct self transmission relative to the axis of the square hole drill bit). The sealing ring 33 can effectively prevent soil from entering the central limiting sleeve 13 and influencing the meshing state of the internal gear 14 of the central limiting sleeve 13 and the external gear 21 of the driving drill rod 2.
And 2, lofting and positioning the side lines of the rectangular pile holes 44 on the ground, and pouring the concrete guard ring 4 along the side lines, as shown in the attached drawing 11.
And 3, excavating the rectangular pile hole 44 by adopting a multi-drilling mode, designing a combination mode of square hole drill bit drilling operation according to the size of the rectangular pile hole 44 and the size of the square hole drill bit hole, and positioning the central point position of each square hole drill bit hole, as shown in the attached drawing 11.
And 4, aligning the preposed guide rod 22 at the bottom end of the driving drill rod 2 with the center point of the square hole drill bit hole, wherein the preposed drill bit 23 is arranged at the lower end of the preposed guide rod 22, cutting soil by the preposed drill bit 23, inserting the preposed guide rod 22 into the soil, guiding the driving drill rod 2 to keep vertical drilling, avoiding the situation that the bottom of the driving drill rod 2 is shaken to generate larger transverse displacement in the rotation process of the square hole drill bit, improving the stability in the drilling process and simultaneously improving the hole forming quality of the square pile hole. The top end of the driving drill rod 2 is connected with a drilling machine, the drilling machine is started to drive the square hole drill bit to drill downwards through the driving drill rod 2, the motion trail of the outer contour of the square hole drill bit is a rounded square shape, and a plurality of rounded square pile holes are combined to form a rectangular pile hole 44; in the drilling process, water or slurry is injected into an excavation surface to moisten a soil body 41 through a grouting channel 24 on a driving drill rod 2, the driving drill rod 2 is of a hollow structure, the grouting channel 24 is arranged inside the driving drill rod 2, a slurry overflow hole 25 is formed in the lower end of the driving drill rod 2, and the slurry overflow hole 25 is communicated with the grouting channel 24; the water or the slurry is injected through the grouting channel 24 and flows out through the slurry overflow hole 25, so that the difficulty of rotary drilling operation of the square hole drill bit is reduced, and the efficiency of the rotary drilling operation is improved; and the driving drill rod 2 is lengthened according to the depth of the pile hole in the drilling process.
And 5, as shown in fig. 13 and 14, after rotary drilling is carried out until the square hole drill bit is filled with the drilling slag 42, lifting the driving drill rod 2 upwards to lift the square hole drill bit out of the pile hole, lifting the movable arc-shaped side plate 152 upwards to clean the drilling slag 42 from the position between the movable arc-shaped side plate 152 and the fixed arc-shaped side plate 151, and then lowering the movable arc-shaped side plate 152 to restore the original position.
And 6, as shown in fig. 15 and 16, aligning the preposed guide rod 22 at the bottom end of the driving drill rod 2 to other central points or inserting the preposed guide rod into a guide drilling hole 43 dug at the previous time, and performing rotary drilling and cleaning operation of the drilling slag 42 according to the methods in the steps 4 and 5 until the drilling is dug to the designed depth.
Step 7, as shown in fig. 17 and 18, after the rectangular pile hole 44 is excavated, the rectangular reinforced concrete pile 45 is constructed, and the reinforcement cage 46 is firstly put into the rectangular pile hole 44, and then concrete 47 is poured into the rectangular pile hole 44, so that the construction of the rectangular reinforced concrete pile 45 is completed.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. The rotary drilling construction method of the combined rectangular-section reinforced concrete pile is characterized by comprising the following construction steps of:
step 1, assembling a square-hole drill bit, installing and fixing a rotary excavating wing plate (11) on a central limiting sleeve (13), and installing and fixing a fixed arc-shaped side plate (151) on the outer side of the rotary excavating wing plate (11); inserting a driving drill rod (2) into a central limiting sleeve (13) of a square hole drill bit, enabling the driving drill rod (2) to penetrate through the central limiting sleeve (13), enabling an outer gear (21) on the driving drill rod (2) to be meshed with an inner gear (14) of the central limiting sleeve (13), respectively installing eccentric connecting bearings (3) at two ends of the central limiting sleeve (13), rotatably connecting one ends of the eccentric connecting bearings (3) with the central limiting sleeve (13), and rotatably connecting the other ends of the eccentric connecting bearings (3) with the driving drill rod (2); mounting the movable arc-shaped side plate (152) on the fixed arc-shaped side plate (151);
step 2, lofting and positioning the side lines of the rectangular pile holes (44) on the ground, and pouring concrete guard rings (4) along the side lines;
step 3, excavating a rectangular pile hole (44) by adopting a multi-drilling mode, designing a combination mode of drilling operation of a square hole drill according to the size of the rectangular pile hole (44) and the size of the hole formed by the square hole drill, and positioning the central point position of the hole formed by the square hole drill;
step 4, aligning a preposed guide rod (22) at the bottom end of the driving drill rod (2) with the center point position of the hole forming of the square hole drill bit, connecting the top end of the driving drill rod (2) with a drilling machine, and starting the drilling machine to drive the square hole drill bit to drill downwards by driving the drill rod (2); in the drilling process, water or slurry is injected into an excavation surface to wet a soil body (41) by driving a grouting channel (24) on a drill rod (2);
step 5, after the square hole drill bit is drilled in a rotary drilling manner and filled with drilling slag (42), lifting the driving drill rod (2) upwards to lift the square hole drill bit out of the pile hole, lifting the movable arc-shaped side plate (152) upwards to clean the drilling slag (42) between the movable arc-shaped side plate (152) and the fixed arc-shaped side plate (151), and then lowering the movable arc-shaped side plate (152) to restore the original position;
step 6, aligning the preposed guide rod (22) at the bottom end of the driving drill rod (2) to other central point positions or inserting the preposed guide rod into a guide drilling hole (43) excavated in the previous time, and performing rotary drilling and cleaning operation of drilling slag (42) according to the methods in the steps 4 and 5 until the drilling hole is excavated to the designed depth;
and 7, after the rectangular pile hole (44) is excavated, constructing the rectangular reinforced concrete pile (45), firstly putting a reinforcement cage (46) into the rectangular pile hole (44), and then pouring concrete (47) into the rectangular pile hole (44) to complete the construction of the rectangular reinforced concrete pile (45).
2. The combined rectangular-section reinforced concrete pile rotary-excavating hole-forming construction method according to claim 1, characterized in that in the step 1, the square hole drill bit is composed of a rotary-excavating wing plate (11), a central limiting sleeve (13), a fixed arc-shaped side plate (151) and a movable arc-shaped side plate (152), the fixed arc-shaped side plate (151) and the movable arc-shaped side plate (152) are formed by splicing three arc-shaped steel plates, the outer contour of the rotary-excavating wing plate (11) is matched with the fixed arc-shaped side plate (151), and the outer contours of horizontal projections of the fixed arc-shaped side plate (151), the movable arc-shaped side plate (152) and the rotary-excavating wing plate (11) are in a Lelo triangle shape; alloy teeth (12) are arranged at the bottom end of the rotary digging wing plate (11).
3. The combined rectangular-section reinforced concrete pile rotary drilling construction method according to claim 1, characterized in that in step 1, two ends of the eccentric connection bearing (3) are respectively provided with a large ring and a small ring, axes of the large ring and the small ring are deviated from each other, the large ring of the eccentric connection bearing (3) is sleeved on a central limiting sleeve (13), the small ring of the eccentric connection bearing (3) is sleeved on the driving drill rod (2), contact surfaces of the eccentric connection bearing (3), the central limiting sleeve (13) and the driving drill rod (2) are respectively provided with a sealing ring groove (31) and a ball groove (32), upper and lower sides of the ball groove (32) are respectively provided with a sealing ring groove (31), a sealing ring (33) is arranged in the sealing ring groove (31), a ball (34) is arranged in the ball groove (32), the driving drill rod (2) can rotate relative to the eccentric connection bearing (3), and the central limiting sleeve (13) can rotate relative to the eccentric connection bearing (3).
4. The rotary drilling construction method for the combined rectangular-section reinforced concrete pile according to claim 1, wherein in the step 1, the driving drill rod (2) is of a hollow structure, a grouting channel (24) is arranged inside the driving drill rod, a grout overflow hole (25) is formed in the lower end of the driving drill rod (2), and the grout overflow hole (25) is communicated with the grouting channel (24); in the step 4, the water or the slurry is injected through the grouting channel (24) and flows out through the slurry overflow hole (25); the driving drill rod (2) is lengthened according to the depth of the pile hole in the drilling process.
5. The combined rectangular-section reinforced concrete pile rotary drilling hole forming construction method according to claim 1, wherein in the step 1, the ratio of the diameter of an inner gear (14) on a central limiting sleeve (13) to the diameter of an outer gear (21) of a driving drill rod (2) is 4:3, in the step 4, the motion track of the outer contour of the square hole drill bit is in a round-corner square shape, and a plurality of round-corner square pile holes are combined to form a rectangular pile hole (44).
6. The rotary excavating and hole forming construction method for the combined rectangular-section reinforced concrete pile according to claim 1, wherein in the step 4, a front drill bit (23) is arranged at the lower end of the front guide rod (22).
7. The rotary excavating and hole forming construction method for the combined reinforced concrete pile with the rectangular cross section according to claim 1, wherein in the step 1, the top of the fixed arc-shaped side plate (151) and the bottom of the movable arc-shaped side plate (152) are respectively provided with a rabbet (153), and the rabbets (153) of the fixed arc-shaped side plate (151) and the movable arc-shaped side plate (152) are mutually meshed; the inner wall of the fixed arc-shaped side plate (151) is provided with a limiting sleeve (154), the inner wall of the movable arc-shaped side plate (152) is provided with a limiting rod (155), and the limiting rod (155) is inserted into the limiting sleeve (154).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110676752.XA CN115492519A (en) | 2021-06-18 | 2021-06-18 | Rotary excavating hole-forming construction method for combined rectangular-section reinforced concrete pile |
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| CN202110676752.XA CN115492519A (en) | 2021-06-18 | 2021-06-18 | Rotary excavating hole-forming construction method for combined rectangular-section reinforced concrete pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115839212A (en) * | 2023-02-20 | 2023-03-24 | 中钜(陕西)工程咨询管理有限公司 | Highway building foundation rotary digging device |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115839212A (en) * | 2023-02-20 | 2023-03-24 | 中钜(陕西)工程咨询管理有限公司 | Highway building foundation rotary digging device |
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