CN214738130U - Inner protecting cylinder suitable for drilling cast-in-place pile of offshore wind power high pile cap foundation - Google Patents
Inner protecting cylinder suitable for drilling cast-in-place pile of offshore wind power high pile cap foundation Download PDFInfo
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- CN214738130U CN214738130U CN202121185613.9U CN202121185613U CN214738130U CN 214738130 U CN214738130 U CN 214738130U CN 202121185613 U CN202121185613 U CN 202121185613U CN 214738130 U CN214738130 U CN 214738130U
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Abstract
The utility model relates to an inner casing for foundation drilling in offshore environment, in particular to an inner casing suitable for a foundation drilling cast-in-place pile of a offshore wind power high pile cap, which is structurally characterized by also comprising a limiting device, a grouting device and a closing plate device, wherein the limiting device comprises a pulley and a pulley bracket for mounting the pulley, and the width of the limiting device is matched with the width of a gap between the inner casing and a steel pipe pile; a plurality of grouting ports are circumferentially and axially distributed on the side wall of the pile casing structure body, the grouting device comprises a main grouting pipe and grouting branch pipes which are vertically distributed with the main grouting pipe and communicated with the main grouting pipe, and the grouting branch pipes are connected and communicated with the grouting ports on the side wall of the pile casing structure body in a one-to-one correspondence manner; the sealing plate device is of an annular structure which surrounds the outer side surface of the bottom end of the pile casing structure. Has the advantages that: effectively keep interior casing and the coincidence of steel-pipe pile axis the corresponding gesture, avoid drilling inclined hole to guarantee the pore-forming quality, can ensure the grout quality, improve the economic nature of batter pile drilling bored concrete pile.
Description
Technical Field
The utility model relates to a drilling of foundation is with interior a section of thick bamboo that protects under marine environment, especially an interior a section of thick bamboo that protects suitable for marine wind power high pile cap basis drilling bored concrete pile.
Background
The geological conditions of the southeast coastal region of China are complex, the distribution of strongly weathered rock layers is wide, and the buried depth of bedrock is large. This regional offshore wind power basis often adopts high pile cap basis, and the pile foundation type is mostly drilling bored concrete pile. In the conventional drilling construction of the existing cast-in-situ bored pile, a steel pipe pile is used as the fixing and guiding of a drilling machine, the steel pipe pile is drilled to a specified position at one time through the drilling machine, then a reinforcement cage is put down, concrete is poured to form the pile, and a slurry wall protector or a steel casing is usually put down in order to prevent hole collapse in the drilling process. Aiming at the condition that a soil layer is shallow on a partial area, the length of a drilling section of the cast-in-place pile can reach 12-20 m, when the length of the drilling section exceeds 12m, the traditional drilling machine is difficult to drill in place at one time due to the limitation of a drill rod centralizer, multi-stage drilling is often needed, and at the moment, a steel casing needs to be adopted for multiple times.
Due to the fact that offshore construction conditions are poor, the drilling period is long, if slurry is adopted for wall protection, the drilled holes in the strongly weathered rock stratum are soaked and washed by slurry for a long time, pile foundations are mostly inclined piles, the drilled holes are inclined, hole collapse is easy to generate, and pile forming quality is difficult to guarantee; if the traditional steel pile casing is adopted, the friction resistance of the side wall is difficult to sink into a designated position, the posture of the pile casing is difficult to control after the pile casing is put in place, the subsequent drilling deviation can be caused, and meanwhile, gaps exist between the pile casing and the steel pipe pile and between the pile casing and a soil body, so that the cast-in-place pile is difficult to fill tightly during pouring, and the pile forming quality is difficult to guarantee.
Disclosure of Invention
An object of the utility model is to provide an interior a section of thick bamboo that protects that is applicable to marine wind power high pile cushion cap basis drilling bored concrete pile who ensures to protect a section of thick bamboo and transfer to target in place, guarantee pore-forming quality, avoid the off normal and hole of collapsing according to prior art's weak point.
The purpose of the utility model is realized through the following ways:
the inner protecting cylinder is suitable for a foundation drilling cast-in-place pile of an offshore wind power high pile cap and comprises a protecting cylinder structure body, and is structurally characterized by also comprising a limiting device, a grouting device and a sealing plate device, wherein the limiting device comprises pulleys and pulley supports for mounting the pulleys, the limiting device is provided with a plurality of groups and is distributed along the periphery and the axial direction of the protecting cylinder structure body at equal intervals, the limiting device is fixed on the outer side surface of the protecting cylinder structure body through the pulley supports, and the width of the limiting device is matched with the width of a gap between the inner protecting cylinder and a steel pipe pile; the side wall of the pile casing structure body is circumferentially and axially distributed with a plurality of grouting ports, the grouting device comprises a main grouting pipe and grouting branch pipes which are vertically distributed with the main grouting pipe and communicated with the main grouting pipe, the main grouting pipe is axially arranged along the pile casing structure body and is arranged in the inner cavity of the pile casing structure body through a connecting plate, and the grouting branch pipes are correspondingly connected and communicated with the grouting ports on the side wall of the pile casing structure body one by one; the upper end part of the grouting main pipe is provided with a connecting part; the sealing plate device is an annular structure which surrounds the outer side face of the bottom end of the pile casing structure body, and the width of the annular structure is in tight fit with the gap between the inner pile casing and the steel pipe pile.
When the device is used, the inner protecting cylinder is placed into the steel pipe pile until the lower end of the inner protecting cylinder is inserted into an appointed position in a soil body, the pulley is convenient for the inner protecting cylinder to move in the steel pipe pile, and under the action of the closing plate device and the pulley bracket, the inner protecting cylinder can be kept in the middle position of the inner cavity of the steel pipe pile to ensure that the posture is not inclined; after interior protective barrel transfers to target in place, under stop device's support, it has effective clearance space to ensure between interior protective barrel and the steel-pipe pile, then the upper end that the slip casting was responsible for is connected to the slip casting equipment through connecting portion, the slip casting equipment starts the back, be responsible for the slip casting with mud via the slip casting, the slip casting branch pipe pours into the clearance space between interior protective barrel upper portion and the steel-pipe pile, the space between interior protective barrel lower part and the outside soil body, until filling closely, this shrouding device is used for preventing that the slip casting is excessive and downward loss, improve and fill closely knit degree. And after grouting is finished, cutting the grouting pipe and the connecting plate thereof in the inner protecting cylinder, and then performing conventional drilling on the treated inner protecting cylinder serving as a conventional protecting cylinder.
Therefore, the utility model discloses a stop device and shrouding device protect a section of thick bamboo in order to ensure and can transfer to target in place, have adopted the slip casting device to carry out the clearance slip casting inside and outside, protect a section of thick bamboo and the corresponding gesture of steel-pipe pile axis coincidence in effectively keeping on the one hand, avoid drilling inclined to one side hole to guarantee the pore-forming quality, on the other hand inject the slip casting under the space, can ensure the grout quality, avoid drilling hole collapse, effectively solved drilling length too big and the stake quality problem that leads to.
The utility model discloses can further specifically do:
the shrouding device is including multilayer rubber ring pad and a plurality of bracket, installs the annular plate between the two adjacent rubber ring pads, and this a plurality of bracket distribute along protecting the annular equidistance of a structure body to perpendicular to rubber ring pad and its lower terminal surface pass the rubber ring pad of the superiors and fix on the annular plate of this superiors' rubber ring pad below.
The rubber ring pad is used for guaranteeing that enough space is provided when the section of thick bamboo is protected to transfer, is unlikely to block, possesses the separation effect to the slip casting space after transferring to target in place simultaneously, prevents the excessive loss of grout material simultaneously. And the toggle and annular plates are used to provide rigid support.
The plate sealing device further comprises a base plate, wherein a plurality of base plates are distributed at equal intervals along the rubber ring pad and are arranged in the elongated holes which are radially distributed and arranged on the middle layer rubber ring pad to serve as fillers of the middle layer rubber ring pad.
The backing plate is used for increasing the rigid support of the middle layer rubber ring pad and avoiding the failure caused by deformation.
In the limiting device, the pulley support is in a right-angled triangle structure, a right-angled edge of the pulley support is welded on the outer side face of the pile casing structure, the pulley is installed on the inner side of a suspended acute angle of the pulley support, and the outer edge of the pulley extends out of the pulley support.
Like this, the pulley is used for guaranteeing that interior protective barrel structure can place the assigned position smoothly, and the rigidity of pulley support is then guaranteed to protect between section of thick bamboo outer wall and the steel-pipe pile, can form predetermined slip casting space between interior protective barrel outer wall and the outside soil body.
The grouting main pipe is provided with a plurality of main pipes which are distributed along the inner annular surface of the pile casing structure body at equal intervals, and the bottom end interfaces of the grouting main pipes are connected and communicated to the grouting ports of the pile casing structure body through grouting branch pipes.
The bottom end interface of the main grouting pipe can be integrally constructed with the branch grouting pipe, namely, is in a bent arc structure and is connected and communicated with the grouting port. The bottom end interface of the grouting main pipe can also be set to be a blind hole.
The shear key is arranged in a plurality of shear keys and is distributed equidistantly along the circumference and the axial direction of the casing structure body.
The shear key is used for improving the stress characteristic of grouting body and improving the grouting quality.
The lifting lug is fixedly arranged at the top end of the casing structure body. The convenience of the operation of the inner casing can be improved through the lifting lugs.
To sum up, the utility model provides an interior casing suitable for marine wind power high pile cushion cap basis drilling bored concrete pile through reserve the slip casting hole on the steel casing and set up the slip casting device, the shrouding device, stop device, it is too big effectively to have solved the long drilling length of strong weathering rock stratum construction, the hole is easily collapsed in the drilling, the casing is difficult to transfer and targets in place, the problem that the pore-forming quality is difficult to guarantee, effectively keep the corresponding gesture of interior casing and steel-pipe pile axis coincidence on the one hand, avoid drilling inclined hole, thereby guarantee the pore-forming quality, on the other hand inject the slip casting pore-forming under the space, can guarantee the grout quality, improve the economic nature of batter pile drilling bored concrete pile.
Drawings
Fig. 1 is the interior protective casing suitable for marine wind power high pile cap basis drilling bored concrete pile is when the construction with the relative structure sketch map of steel-pipe pile (with the schematic of protective casing structure, omitted other structures of interior protective casing).
Fig. 2 is a schematic structural diagram of an inner casing of the foundation cast-in-situ pile suitable for the offshore wind power high pile cap foundation of the present invention;
FIG. 3 is a schematic structural view of an upper portion of the inner casing shown in FIG. 2; FIG. 4 is a schematic cross-sectional view of FIG. 2;
FIG. 5 is a schematic view of a bottom plate sealing device of the inner cylinder shown in FIG. 2;
FIG. 6 is a sectional view taken along the line A in FIG. 5; FIG. 7 is a sectional view taken along line B of FIG. 5; fig. 8 is a cross-sectional view taken along line C of fig. 5.
The present invention will be further described with reference to the following examples.
Detailed Description
The best embodiment is as follows:
referring to the attached drawings 1-4, the utility model provides an interior protective barrel structure suitable for offshore wind power high pile cap basis drilling bored concrete pile, including the upper end be located the steel-pipe pile in the lower extreme insert the soil body protect a structure 10 simultaneously, set up a plurality of grouting devices 20 in protecting a structure 10 inner chamber, it has the slip casting mouth 11 of a plurality of hoop distributions and axial multilayer distribution to distribute on the lateral wall, protect a structure 10 outside bottom and set up shrouding device 30 along the annular direction, protect a structure 10 outside and set up a plurality of stop device 40 and the shear force key 60 of multilayer along annular equidistance distribution and axial, protect a structure 10 top and set up lug 50.
The grouting devices 20 are three groups and distributed on the inner side of the pile casing structure 10 in an equilateral triangle, and each grouting device 20 comprises a main grouting pipe 21, a branch grouting pipe 22, a connecting plate 22 and a flange plate 23 and is used for grouting annular grouting spaces formed between the outer wall of the pile casing structure 10 and the steel pipe pile 1 and between the outer wall of the steel pile casing 10 and an external soil body. The grouting main pipe 21 is axially arranged along the inner cavity of the casing structure body 10, and the grouting branch pipes 24 are vertically distributed and communicated with the grouting main pipe 21 and are correspondingly arranged with the grouting ports 11 and are connected and communicated through welding; the connecting plates 22 are positioned between the main grouting pipe 21 and the inner wall of the pile casing structure 10, are arranged along the length direction of the main grouting pipe 21, and are used for connecting the main grouting pipe 21 and the pile casing structure 10 through welding; the upper end of the grouting main pipe 21 is provided with a flange 23 as a connecting part, the middle part of the flange 23 is provided with an opening communicated with the grouting pipe 21, and the flange 23 is provided with a bolt hole.
The limiting device 40 includes a pulley 41 and a pulley holder 42. The pulley 41 is fixed at the outer suspension end part of the pulley bracket 42, and the pulley bracket 42 is welded on the outer wall of the pile casing structure 10; the limiting devices 40 are uniformly arranged along the annular direction of the outer wall of the pile casing structure body 10 and staggered with the grouting ports 11, and are arranged in a multi-layer mode along the top end, the middle end and the bottom end of the outer wall of the pile casing structure body 10 in the vertical direction; the limiting device 40 can solve the problems that in the prior art, after the pile casing structure is placed downwards, the posture is difficult to guarantee, the inner pile casing and the axis of the steel pipe pile are not coincident, so that the drilled hole is inclined, and meanwhile, a preset annular grouting space can be formed between the outer wall of the pile casing structure 10 and the steel pipe pile 1 and between the outer wall of the pile casing structure 10 and an external soil body, so that the grouting quality is improved.
The outer wall of the casing structure body 10 is provided with a plurality of layers of annular shear keys 60 along the length direction, the shear keys 60 are arranged to avoid the grouting ports 11 and the limiting devices 40, and the space between the shear keys 60 is not too close; the shear key 60 can improve the stress characteristic of the grouting body and improve the grouting quality.
Referring to fig. 5-8, the sealing plate device 30 is located at the bottom end of the outer wall of the casing structure 10, and is arranged along the annular direction, and includes multiple layers of rubber ring pads and multiple toggle plates, and an annular plate is installed between two adjacent rubber ring pads, and this embodiment takes three layers of rubber ring pads and two layers of annular plates as an example: the two layers of annular plates comprise an upper annular plate 32 and a lower annular plate 33, are welded at the bottom end of the outer wall of the pile casing structure body 10 along the annular direction, have consistent width and thickness, leave a certain gap between the two annular plates, and are provided with three layers of rubber ring pads, namely an upper layer rubber ring 35, a middle layer rubber ring 36 and a bottom layer rubber ring 37 in a layered manner; a backing plate 34 is arranged to fill the middle rubber ring 36; a toggle plate 31 is arranged between the upper ring plate 32 and the cylindrical shell protecting structure body 10 for connection; the three layers of rubber ring pads are consistent in width and thickness, and the radial width is slightly larger than that of the upper ring plate 32 and the lower ring plate 33; rubber ring pad can guarantee to transfer and have sufficient space when protecting a section of thick bamboo, is unlikely to block, possesses the separation effect to the slip casting space after putting in place simultaneously, prevents the excessive loss of grout material simultaneously.
In specific implementation, a drilling machine drills a steel pipe pile 1 and drills into a soil layer to form a drilling space, an inner pile casing 2 is hung in the steel pipe pile 1 from top to bottom until the upper end of the inner pile casing 2 is located in the steel pipe pile 1 while the lower end of the inner pile casing 2 is inserted into a soil body to reach a specified position, and annular grouting spaces are formed between the outer wall of a pile casing structure body 10 and the steel pipe pile 1 and between the outer wall of the pile casing structure body 10 and the external soil body; a diver dives into the steel pipe pile 1 to bolt an external grouting pipe with a flange plate and the flange plate 23, and annular grouting spaces formed between the outer wall of the pile casing structure body 10 and the steel pipe pile 1 and between the outer wall of the pile casing structure body 10 and an external soil body are subjected to pressure grouting by grouting equipment on a ship machine, so that the pile casing structure is tightly filled, and the pile forming quality and the pile foundation bearing capacity are improved; after grouting, a diver submerges into the pile to unscrew the bolts of the flange plate 23 and remove the external grouting pipe; after the grout body reaches a certain strength, carrying out underwater sampling on the grout body for detecting grouting quality, cutting off the grouting branch pipes 24 and the connecting plates 22, and removing impurities on the inner wall of the pile casing structure body 10; and taking the casing structure body 10 as a casing for continuous drilling, and carrying out the next drilling process.
For the cast-in-situ bored pile with longer drilled hole length, according to the conditions of the designed drilled hole length, diameter, geological conditions and the like, a multi-stage inner pile casing and a multi-time drilling process are adopted, the construction process is repeated, the one-time drilling length of the pile casing-free support is properly reduced, and meanwhile, the number, specifications and construction organization schemes of the pile casing structure body 10, the grouting device 20, the grouting opening 11, the sealing plate device 30, the limiting device 40, the shear key 60 and other components are reasonably adjusted until the pile casing structure body is drilled to a specified position, holes are formed, and the pile is cast.
The part of the utility model which is not described is the same as the prior art.
Claims (7)
1. The inner protecting cylinder is suitable for a foundation drilling cast-in-place pile of an offshore wind power high pile cap and comprises a protecting cylinder structure body, and is characterized by further comprising a limiting device, a grouting device and a sealing plate device, wherein the limiting device comprises pulleys and pulley supports for mounting the pulleys, the limiting device is provided with a plurality of groups and is distributed along the periphery and the axial direction of the protecting cylinder structure body at equal intervals, the limiting device is fixed on the outer side surface of the protecting cylinder structure body through the pulley supports, and the width of the limiting device is matched with the width of a gap between the inner protecting cylinder and a steel pipe pile; the side wall of the pile casing structure body is circumferentially and axially distributed with a plurality of grouting ports, the grouting device comprises a main grouting pipe and grouting branch pipes which are vertically distributed with the main grouting pipe and communicated with the main grouting pipe, the main grouting pipe is axially arranged along the pile casing structure body and is arranged in the inner cavity of the pile casing structure body through a connecting plate, and the grouting branch pipes are correspondingly connected and communicated with the grouting ports on the side wall of the pile casing structure body one by one; the upper end part of the grouting main pipe is provided with a connecting part; the sealing plate device is an annular structure which surrounds the outer side face of the bottom end of the pile casing structure body, and the width of the annular structure is in tight fit with the gap between the inner pile casing and the steel pipe pile.
2. The inner casing suitable for offshore wind power high pile cap foundation bored concrete pile according to claim 1, wherein the closing plate means comprises a plurality of layers of rubber ring pads and a plurality of brackets, wherein an annular plate is installed between two adjacent rubber ring pads, the plurality of brackets are distributed along the circumferential direction of the casing structure body at equal intervals, are perpendicular to the rubber ring pads, and the lower end surface of the plurality of brackets penetrates through the uppermost rubber ring pad and is fixed on the annular plate below the uppermost rubber ring pad.
3. The inner casing suitable for the offshore wind power high-rise pile cap foundation bored pile according to claim 2, wherein the sealing plate device further comprises a plurality of backing plates which are equidistantly distributed along the rubber ring gasket and are installed in the elongated holes which are radially distributed and are provided in the middle layer rubber ring gasket as fillers of the middle layer rubber ring gasket.
4. The inner casing suitable for the offshore wind power high pile cap foundation bored pile according to claim 1, wherein in the limiting device, the pulley holder is in a right triangle configuration and one right-angled side thereof is welded to an outer side surface of the casing structure, the pulley is installed inside a suspended acute angle of the pulley holder, and an outer edge portion of the pulley extends out of the pulley holder.
5. The inner casing suitable for the offshore wind power high-rise pile cap foundation bored pile according to claim 1, wherein the main grouting pipe is provided with a plurality of main grouting pipes which are equidistantly distributed along the inner annular surface of the casing structure, and bottom end connectors of the main grouting pipes are connected and communicated to a grouting port of the casing structure through a grouting branch pipe.
6. The inner casing suitable for the offshore wind power high-rise pile cap foundation bored pile according to claim 1, further comprising a plurality of shear keys equidistantly distributed along a circumferential direction and an axial direction of the casing structure.
7. The inner casing suitable for the offshore wind power high-rise pile cap foundation bored pile according to claim 1, further comprising a lifting lug fixedly mounted on a top end of the casing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121185613.9U CN214738130U (en) | 2021-05-31 | 2021-05-31 | Inner protecting cylinder suitable for drilling cast-in-place pile of offshore wind power high pile cap foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121185613.9U CN214738130U (en) | 2021-05-31 | 2021-05-31 | Inner protecting cylinder suitable for drilling cast-in-place pile of offshore wind power high pile cap foundation |
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| CN214738130U true CN214738130U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121185613.9U Active CN214738130U (en) | 2021-05-31 | 2021-05-31 | Inner protecting cylinder suitable for drilling cast-in-place pile of offshore wind power high pile cap foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855783A (en) * | 2022-05-31 | 2022-08-05 | 中国建筑第八工程局有限公司 | Pile foundation construction device and method for hole collapse part of cast-in-situ bored pile |
-
2021
- 2021-05-31 CN CN202121185613.9U patent/CN214738130U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855783A (en) * | 2022-05-31 | 2022-08-05 | 中国建筑第八工程局有限公司 | Pile foundation construction device and method for hole collapse part of cast-in-situ bored pile |
| CN114855783B (en) * | 2022-05-31 | 2023-10-13 | 中国建筑第八工程局有限公司 | Pile foundation construction device and construction method for hole collapse part of bored pile |
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