CN113585992A - Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile - Google Patents
Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile Download PDFInfo
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- CN113585992A CN113585992A CN202110831662.3A CN202110831662A CN113585992A CN 113585992 A CN113585992 A CN 113585992A CN 202110831662 A CN202110831662 A CN 202110831662A CN 113585992 A CN113585992 A CN 113585992A
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- 238000005553 drilling Methods 0.000 title claims abstract description 35
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 44
- 239000002893 slag Substances 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 abstract description 18
- 239000011435 rock Substances 0.000 abstract description 7
- 239000010802 sludge Substances 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
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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
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of an embedded rock cast-in-place pile, and discloses a pump suction reverse circulation drilling structure of an ultra-thick covering layer large-diameter embedded rock cast-in-place pile, which comprises a drill rod and a plurality of stages of mud ponds which are sequentially arranged and communicated, wherein a circulation hole is formed in the drill rod; the first mud pit is communicated with a circulating hole, the circulating pipe is connected with a sand pump, and the last mud pit is communicated with the interior of the pile hole through a flow channel; the mud at the bottom of the pile hole enters a circulating pipe from bottom to top through the circulating hole and is injected into a first mud pit, and the mud flows back into the pile hole through a flow channel after being sequentially precipitated by the multistage mud pits; through setting up multistage mud pit that the preface intercommunication was arranged, the drill bit is at the in-process of creeping into, through the grit pump with downthehole mud of stake, through the inside circulation hole of drilling rod, via circulating pipe reverse circulation to mud pit in, through the filtration in multistage mud pit, can effectively filter sediment etc. in the mud, and the efficiency of just slagging tap is also high, avoids follow-up clear hole difficulty and the too much problem of sediment of existence.
Description
Technical Field
The invention relates to the technical field of an embedded rock cast-in-place pile, in particular to a pump-pumping reverse circulation drilling structure of a large-diameter embedded rock cast-in-place pile with an ultra-thick covering layer.
Background
Along with the extension of urban building to the space, more and more high-rise, super high-rise building constantly appears, and its core section of thick bamboo adopts single stake single-column drilling bored concrete pile, shows as major diameter end-bearing pile in pile foundation design, and this type of pile diameter often exceeds 2000mm, and some pile diameters exceed 3000 mm. Under the influence of regional geology, end-bearing piles encountered by some pile foundation projects need to penetrate through an upper ultra-thick covering layer and are embedded into a rock stratum downwards, so that pile holes are ultra-deep, and the depth of the pile holes exceeds 100 m.
The rotary drilling rig is high in automation degree and high in hole forming speed and is widely applied, however, for drilling of the large-diameter rock-socketed cast-in-place pile, hole forming operation is performed by the rotary drilling rig, the upper portion of a pile hole is in a covering layer, and the drilling speed is high.
In the prior art, in order to realize the effect of mud wall protection, the drill bit usually adopts pump suction reverse circulation to clear the hole in the drilling process, namely, the mud in the pile hole is circulated to an external mud tank and then returns to the pile hole, and then the mud wall protection is continued.
Disclosure of Invention
The invention aims to provide a pump-pumping reverse circulation drilling structure of a large-diameter rock-socketed cast-in-place pile with an ultra-thick covering layer, and aims to solve the problems that in the prior art, sediments in slurry are difficult to effectively filter, hole cleaning is difficult and sediments are excessive.
The invention is realized in this way, the pump suction reverse circulation drilling structure of the large-diameter rock-socketed cast-in-place pile with the ultra-thick covering layer is characterized by comprising a drill rod and a plurality of stages of sequentially arranged and communicated mud ponds, wherein the bottom of the drill rod is connected with a drill bit for drilling, and the mud ponds are arranged on a construction site;
the first mud pit is communicated with the top of the circulation hole through a circulation pipe, the circulation pipe is connected with a sand pump, the sand pump is provided with a pump pipe head, the pump pipe head is arranged in the first mud pit, and the last mud pit is communicated with the inside of the pile hole through a flow channel;
and in the process that the drill rod drives the drill bit to drill in the covering layer, the sand-stone pump is started to pump a reverse circulation hole cleaning pump, the slurry at the bottom of the pile hole enters the circulation pipe from bottom to top through the circulation hole and is injected into the first slurry tank, and the slurry is sequentially precipitated through the multistage slurry tanks and then flows back into the pile hole through the flow channel through the last slurry tank.
Furthermore, the construction site is provided with three stages of mud ponds, a first mud baffle plate is arranged between the first mud pond and the middle mud pond, a second mud baffle plate is arranged between the middle mud pond and the last mud pond, and the tops of the first mud baffle plate and the second mud baffle plate are respectively lower than the tops of the mud ponds and are arranged.
Further, the top of the first slurry barrier is higher than the top of the second slurry barrier.
Furthermore, a first filter hole is formed in the first slurry partition plate, a second filter hole is formed in the second slurry partition plate, and the aperture of the first filter hole is larger than that of the second filter hole.
Furthermore, a pile casing is inserted into the pile hole, and the top of the pile casing extends to the top of the pile hole; the top of protecting the section of thick bamboo is equipped with the breach of undercut, the breach intercommunication the runner.
Further, the bottom of the notch is higher than the bottom of the flow channel.
Further, the bottom of the mud pit has a bottom wall, which is arranged inclined downwards in the flow direction of the mud in the mud pit.
Further, along the flowing direction of the mud in the mud tank, the tail end of the bottom wall of the mud tank is sunken downwards to form a slag containing groove; the length extension direction of the slag containing groove is perpendicular to the flow direction of the mud in the mud tank.
Further, the slag containing groove is provided with opposite side walls opposite to the flowing direction of the slurry in the slurry tank; along the direction from bottom to top, the relative side wall of the slag containing groove is obliquely arranged and is obliquely arranged along the flowing direction of the slurry in the slurry tank.
Further, the pump pipe head is arranged in a slag placing groove of the first mud pit.
Compared with the prior art, the pump suction reverse circulation drilling structure of the super-thick covering layer large-diameter rock-socketed cast-in-place pile provided by the invention has the advantages that the multistage mud tanks which are sequentially communicated are arranged, in the drilling process of a drill bit, mud in a pile hole is circulated back to the mud tanks through circulation holes in a drill rod through the circulation pipes by the sand pump, and dregs and the like in the mud can be effectively filtered through the filtration of the multistage mud tanks, the deslagging efficiency is also high, and the problems of difficult hole cleaning and excessive dregs in the follow-up process are solved.
Drawings
FIG. 1 is a schematic front view of a pump-pumped reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed cast-in-place pile provided by the present invention;
fig. 2 is a schematic front view of a mud pit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-2, a preferred embodiment of the present invention is shown.
The pump-pumping reverse circulation drilling structure of the ultra-thick covering layer large-diameter rock-socketed cast-in-place pile is suitable for cast-in-place pile with the diameter of 2000mm or more, suitable for rock-socketed cast-in-place pile with the pile hole 100 covering stratum larger than 60m or more, suitable for hard rock-socketed pile construction with the pile end bearing layer with the strength of 60MPa or more, and suitable for construction sites with strict requirements on noise.
The pump suction reverse circulation drilling structure of the ultra-thick covering layer large-diameter rock-socketed cast-in-place pile comprises a drill rod 101 and a plurality of stages of mud ponds which are sequentially arranged and communicated, wherein a drill bit is connected to the bottom of the drill rod 101, and drilling in a covering layer and a rock stratum is realized by means of drilling of the drill bit. The multistage mud pit is arranged in the construction field, is equipped with the circulation hole that link up from top to bottom in the drilling rod 101.
The first mud pit 104 is communicated with the top of the circulation hole through a circulation pipe 102, the circulation pipe 102 is connected with a sand pump 103, the sand pump 103 is provided with a pump pipe head, the pump pipe head is arranged in the first mud pit 104, and the last mud pit 109 is communicated with the inside of the casing through a flow passage 108;
after a drill bit begins to drill a pile hole 100 with a set depth in a covering layer, a sand pump 103 is started to pump and reversely circulate to clean the hole, the drill bit is kept to synchronously drill downwards, slurry at the bottom of the pile hole 100 enters a circulating pipe 102 from bottom to top through the circulating hole and is injected into a first slurry tank 104, and the slurry is sequentially precipitated through a plurality of stages of slurry tanks and then flows back into the pile hole 100 through a flow passage 108 through a last slurry tank 109;
the pump of the super thick overburden major diameter embedded rock bored concrete pile pump that the aforesaid provided pumps the reverse circulation and creeps into structure, through setting up multistage mud pond that the order intercommunication was arranged, the drill bit is at the in-process that creeps into, through grit pump 103 with the downthehole mud of stake, through the inside circulation hole of drilling rod, in via circulating pipe reverse circulation to mud pond, through the filtration in multistage mud pond, can be with effective filtration such as the sediment in the mud, and the efficiency of slagging tap is also high, avoid follow-up existence clear hole difficulty and the too much problem of sediment.
After the pile hole 100 is drilled, the sand pump 103 is used for pumping and reverse circulation hole cleaning continuously, so that the problem that secondary hole cleaning is difficult due to excessive sediment of drilling slag is avoided. After the drill bit stops advancing, the drill bit is lifted by 30-50 cm, normal circulation of slurry is kept, the slurry at the bottom of a drilled hole carries sediment at the bottom of the hole, the sediment is pumped by a sand pump 103 and rises to a circulating pipe 102 from a circulating hole of a drill rod 101 to be discharged, the slurry with better performance after being precipitated by a multistage slurry pond automatically flows into a pile hole 100, the liquid level of the pile hole 100 is supplemented, and pump suction reverse circulation hole cleaning is formed, so that the purpose of cleaning the hole at one time is achieved.
The construction site is provided with three stages of mud ponds, a first mud baffle plate 105 is arranged between the first mud pond 104 and the middle mud pond 106, and a second mud baffle plate 107 is arranged between the middle mud pond 106 and the last mud pond 109; the top of the first mud baffle 105 and the top of the second mud baffle 107 are each arranged below the top of the mud pit, so that effective flow of mud in the middle of the multistage mud pit is ensured.
The top of the first mud baffle plate 105 is higher than the top of the second mud baffle plate 107, the pumping reverse circulation hole cleaning is carried out, mud and sediments in the pile hole 100 are sucked into the first mud pool 104 through the sand pump 103, and the sediments are not precipitated in the mud due to the sucked mud, at the moment, the height of the first mud baffle plate 105 is set to be higher, so that excessive sediments are prevented from flowing into the middle mud pool 106, the mud can be buffered to flow in sequence in the first mud pool 104 and the middle mud pool 106, and most of the sediments are convenient to precipitate in the first mud pool 104.
After the mud enters the middle mud pit 106, because the stirring ratio of the mud is smaller, at this time, the second mud baffle plate 107 does not need to be set too high, and can be shorter than the first mud baffle plate 105, so that the mud is accelerated to flow into the last mud pit 109, and then the mud is accelerated to flow back into the pile hole 100.
The first slurry separation plate 105 is provided with a first filtering hole, the second slurry separation plate 107 is provided with a second filtering hole, and the aperture of the first filtering hole is larger than that of the second filtering hole.
Set up first filtration hole in the first mud baffle 105, can carry out coarse filtration to the sediment in the mud, set up the second in the second mud baffle 107 and filter the hole, can carry out fine filtration to the sediment in the mud, through the filtration in proper order in first filtration hole and second filtration hole, can block in the sediment continues to flow into stake hole 100, and can accelerate the rapid flow and the filtration of mud between a plurality of mud ponds.
The pile hole 100 is inserted with a pile casing, the top of the pile casing extends to the top of the pile hole 100, the top of the pile casing is provided with a notch which is sunken downwards and is communicated with the flow channel 108, so that the mud in the final mud pit 109 can conveniently flow into the pile hole 100 through the notch through the flow channel 108.
The bottom of the gap is higher than the bottom of the flow channel 108, and sediment in the slurry can be further precipitated between the flow channel 108 and the gap.
The bottom of the mud pit has a bottom wall 110, which bottom wall 110 of the mud pit is arranged inclined downwards in the direction of flow of mud in the mud pit. In this way, the inclined arrangement of the bottom wall 110 can facilitate the sequential circulation of the sludge in the multistage mud pit, facilitate the sedimentation of the sludge in the sludge, and push against the inclined end of the bottom wall 110.
Along the flowing direction of the mud in the mud pit, the tail end of the bottom wall 110 of the mud pit is downwards sunken to form a slag containing groove 112; the lengthwise extension direction of the slag groove 112 is perpendicular to the flow direction of the mud in the mud pit.
Thus, the sludge falling onto the bottom wall 110 follows the bottom wall 110 and is conveniently introduced into the sludge holding tank 112, facilitating sedimentation of the sludge, and also facilitating flow guidance of the slurry between the slurry ponds, by the liquid flow path force of the slurry and the inclined arrangement of the bottom wall 110.
The slag trap 112 has opposite side walls 111 opposite to the flow direction of the slurry in the slurry tank; the opposite side walls 111 of the slag chute 112 are arranged obliquely in the bottom-up direction and obliquely in the flow direction of the sludge in the sludge basin.
When the mud is inclined downwards along the bottom wall 110, in order to avoid the arrangement of the slag containing groove 112 and the backflow impact of the mud, the opposite side walls 111 of the slag containing groove 112 are arranged in an inclined mode, so that the impact of the slag in the slag containing groove 112 is avoided, the underflow formed by the impact of the mud in the slag containing groove 112 can be buffered, and the mud is ensured to flow in sequence in the multistage mud tank.
The pump pipe head is arranged in the slag containing groove 112 of the first mud pool, so that mud pumped out by the sand-stone pump 103 is directly left in the slag containing groove 112 through the pump pipe head, the sediment in the mud is convenient to deposit and leave in the slag containing groove 112 of the first mud pool 104, the filtering effect of the mud is greatly improved, and the sequential flowing speed of the follow-up mud in the multistage mud pool can be accelerated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The pump suction reverse circulation drilling structure of the ultra-thick covering layer large-diameter rock-socketed cast-in-place pile is characterized by comprising a drill rod and a plurality of stages of sequentially arranged and communicated mud ponds, wherein the bottom of the drill rod is connected with a drill bit for drilling, and the mud ponds are arranged on a construction site and are communicated with one another, and a circulating hole which is communicated up and down is formed in the drill rod;
the first mud pit is communicated with the top of the circulation hole through a circulation pipe, the circulation pipe is connected with a sand pump, the sand pump is provided with a pump pipe head, the pump pipe head is arranged in the first mud pit, and the last mud pit is communicated with the inside of the pile hole through a flow channel;
and in the process that the drill rod drives the drill bit to drill in the covering layer, the sand-stone pump is started to pump a reverse circulation hole cleaning pump, the slurry at the bottom of the pile hole enters the circulation pipe from bottom to top through the circulation hole and is injected into the first slurry tank, and the slurry is sequentially precipitated through the multistage slurry tanks and then flows back into the pile hole through the flow channel through the last slurry tank.
2. The pump-pumped reverse circulation drilling structure of the ultra-thick covering layer large-diameter rock-socketed cast-in-place pile as claimed in claim 1, wherein the construction site is provided with three stages of mud ponds, a first mud baffle plate is arranged between the first mud pond and the middle mud pond, a second mud baffle plate is arranged between the middle mud pond and the last mud pond, and the top of the first mud baffle plate and the top of the second mud baffle plate are respectively arranged lower than the top of the mud ponds.
3. The pumped reverse circulation drilling structure for an ultra-thick overburden large diameter rock-socketed pile as recited in claim 2, wherein a top of said first mud flap is higher than a top of said second mud flap.
4. The pump-pumped reverse circulation drilling structure of the ultra-thick overburden large diameter rock-socketed cast-in-place pile as claimed in claim 2, wherein said first slurry baffle is provided with a first filtering hole therein, said second slurry baffle is provided with a second filtering hole therein, and the aperture of said first filtering hole is larger than the aperture of said second filtering hole.
5. The pump-pumped reverse circulation drilling structure of the ultra-thick overburden large diameter rock-socketed cast-in-place pile as claimed in any one of claims 1 to 4, wherein a casing is inserted into the pile hole, and the top of the casing extends to the top of the pile hole; the top of protecting the section of thick bamboo is equipped with the breach of undercut, the breach intercommunication the runner.
6. The pump-pumped reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed cast-in-place pile as recited in claim 5, wherein said gap has a bottom that is higher than a bottom of said flow channel.
7. Pumping reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed pile according to any one of claims 1 to 4, wherein the bottom of the mud pit has a bottom wall which is arranged inclined downwards in the flow direction of the mud in the mud pit.
8. The pump-pumped reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed cast-in-place pile as claimed in claim 8, wherein along the flowing direction of the slurry in the slurry tank, the tail end of the bottom wall of the slurry tank is sunken downwards to form a slag containing groove; the length extension direction of the slag containing groove is perpendicular to the flow direction of the mud in the mud tank.
9. The pumped reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed pile as recited in claim 8, wherein said ballast tank has opposite side walls opposite to the direction of flow of slurry in the mud pit; along the direction from bottom to top, the relative side wall of the slag containing groove is obliquely arranged and is obliquely arranged along the flowing direction of the slurry in the slurry tank.
10. The pump-pumped reverse circulation drilling structure of an ultra-thick overburden large diameter rock-socketed cast-in-place pile as recited in claim 8, wherein said pump head is placed in a slag receiving tank of a head mud pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831662.3A CN113585992A (en) | 2021-07-22 | 2021-07-22 | Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831662.3A CN113585992A (en) | 2021-07-22 | 2021-07-22 | Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile |
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| CN113585992A true CN113585992A (en) | 2021-11-02 |
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| CN202110831662.3A Pending CN113585992A (en) | 2021-07-22 | 2021-07-22 | Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile |
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