CN114108594A - Diameter-expanding precast pile and construction method for same - Google Patents
Diameter-expanding precast pile and construction method for same Download PDFInfo
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- CN114108594A CN114108594A CN202111361265.0A CN202111361265A CN114108594A CN 114108594 A CN114108594 A CN 114108594A CN 202111361265 A CN202111361265 A CN 202111361265A CN 114108594 A CN114108594 A CN 114108594A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 77
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 18
- 239000011440 grout Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 abstract description 22
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 13
- 238000007599 discharging Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011365 complex material Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an expanded precast pile and a construction method for the expanded precast pile. The diameter-expanding precast pile comprises a precast pile body and an elastic air bag, wherein the precast pile body is provided with a pile cavity and a drainage channel used for communicating the pile cavity with the outside, the elastic air bag is sleeved on the side wall of the precast pile body, and the elastic air bag is configured to expand under the pressure action of a filling medium introduced along the drainage channel and is surrounded with the side wall of the pile body to form a filling cavity. The construction method for the expanded precast pile comprises the following steps: driving the precast pile into a soil layer; inflating the pile cavity to expand the elastic air bag under air pressure to form a filling cavity; and stopping inflating, pouring concrete slurry into the pile cavity, and filling the concrete slurry into the filling cavity. The concrete slurry in the filling cavity is condensed and then combined with the precast pile into a whole, so that the concrete precast pile with the expanded section is formed in the soft soil, the upper load of the precast pile is effectively transmitted to the deep soil layer, the relative displacement between the precast pile and the soil layer and the settlement of the precast pile are reduced, and the bearing capacity of the soft soil foundation is obviously improved.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment, in particular to an expanded precast pile and a construction method for the expanded precast pile.
Background
Soft soils generally have poor engineering properties such as high water content, high compressibility, low bearing capacity, etc., and the mechanical and engineering properties of such soils need to be improved prior to engineering construction. At present, most soft soil foundation projects adopt a composite foundation method or a method of driving precast piles to perform foundation treatment. The composite foundation method comprises the steps of driving and setting cement soil piles, lime soil piles or cast-in-place piles, and the like, but the pile quality cannot be ensured due to the high water content of soft soil, large pore ratio, complex material components and easy shrinkage or hole collapse in the hole forming process. Although the bearing capacity of the soft soil foundation can be improved to a certain extent by adopting the mode of driving the precast pile, the pile side friction of the precast pile is small due to overlarge difference between the rigidity of the precast pile and the rigidity of the soft soil, so that the condition that the precast pile and the soft soil move relatively easily occurs, and the upper load cannot be effectively transmitted to the deep soil layer, so that the diameter of the precast pile is often increased, but the economic cost can be obviously increased, and the difficulty degree of pile driving is also increased.
Disclosure of Invention
Accordingly, there is a need for an expanded precast pile and a construction method for the expanded precast pile, which are intended to improve the bearing capacity of a soft soil foundation and effectively transmit an upper load to a deep soil layer.
The application provides a hole enlargement precast pile includes:
the precast pile comprises a pile body, a pile cavity is arranged in the pile body, a drainage channel is arranged in the pile body along the radial direction, and the drainage channel is used for communicating the pile cavity with the outside;
the elastic air bag is sleeved on the side wall of the pile body and used for covering one end, close to the outside, of the drainage channel, and the elastic air bag is configured to be capable of expanding along the direction away from the precast pile under the pressure action of a filling medium introduced along the drainage channel and form a filling cavity with the side wall of the pile body in an enclosing mode.
When the diameter-expanding precast pile is used, filling media are injected into the pile cavity, the filling media enter a space formed by the elastic air bag and the side wall of the pile body in an enclosing mode along the drainage channel, the elastic air bag expands along the direction far away from the precast pile under the pressure of the filling media along with the increase of the filling media, the elastic air bag and the side wall of the pile body are in an enclosing mode to form the filling cavity, and the filling media are filled in the filling cavity. When the filling medium is building materials such as concrete slurry, the concrete slurry filled in the pile cavity is condensed and then combined with the precast pile into a whole, and the concrete slurry filled in the filling cavity is condensed and then combined with the precast pile into a whole, so that the concrete precast pile with the expanded section is formed in soft soil, the concrete precast pile with the expanded section can effectively transmit the upper load of the precast pile to the deep soil layer, the relative displacement between the precast pile and the soil layer and the settlement of the precast pile are reduced, and the bearing capacity of the soft soil foundation is obviously improved; secondly, the concrete slurry is solidified and combined with the precast pile in the pile cavity, and the concrete slurry is solidified and combined with the precast pile in the elastic air bag, so that the concrete slurry can be prevented from directly contacting soft soil in the process of solidifying to form an expansion section, and the pile forming quality is ensured; in addition, the elastic air bag can compact soft soil around the precast pile in the expansion process, and the bearing capacity and the pile side frictional resistance of the soft soil around the precast pile are effectively improved.
The technical solution of the present application is further described below:
in one embodiment, the height of the inlet end of the drainage channel relative to the bottom of the pile cavity is greater than the height of the outlet end of the drainage channel relative to the bottom of the pile cavity.
In one embodiment, the diameter-expanded precast pile further comprises fixing pieces, and the fixing pieces are sleeved at two ends of the elastic air bag to fix the elastic air bag to the pile body.
In one embodiment, the diameter-expanded precast pile further comprises a sealing element, one end of the pile cavity is an open end, and the sealing element is arranged at the open end in a sealing mode.
In one embodiment, the diameter-expanding precast pile further comprises an inflation tube, a grouting tube and an exhaust tube, wherein the inflation tube, the grouting tube and the exhaust tube are all arranged in the sealing element in a penetrating mode, one end of the inflation tube is communicated with the pile cavity, the other end of the inflation tube is used for being communicated with the outside, one end of the grouting tube is communicated with the pile cavity, the other end of the grouting tube is used for being communicated with the outside, one end of the exhaust tube is communicated with the pile cavity, and the other end of the exhaust tube is used for being communicated with the outside.
In one embodiment, one end of the exhaust pipe, which is used for being communicated with the outside, is provided with an exhaust valve, and the exhaust valve is used for adjusting the air pressure in the pile cavity.
In one embodiment, the precast pile further comprises a pile head and a pile end, the pile head is connected with the top of the pile body, the pile end is connected with the bottom of the pile body, the pile head is provided with a through hole for communicating the pile cavity with the outside, and the diameter of the pile head and the diameter of the pile end are both larger than the diameter of the pile body.
In one embodiment, the end of the pile end away from the pile body is provided with a conical shape.
In one embodiment, the number of the elastic air bags is at least two, all the elastic air bags are distributed along the length direction of the pile body, the number of the drainage channels is at least two along the length direction of the pile body, and the drainage channels correspond to the elastic air bags one by one.
On the other hand, the application also provides a construction method for the expanded diameter precast pile of any one of the embodiments, which comprises the following steps:
driving the expanded precast pile to a preset depth of a soil layer;
filling gas into the pile cavity, wherein the gas enters between the elastic air bag and the side wall of the pile body along the drainage channel, and the elastic air bag expands under the pressure of the gas and forms the filling cavity by being surrounded with the side wall of the precast pile;
detect the atmospheric pressure in the stake intracavity, work as stop to aerify after the atmospheric pressure in the stake intracavity reaches first predetermined value, and when treating atmospheric pressure in the stake intracavity is stabilized to first predetermined range, to the inside concrete grout that fills of stake chamber, work as after the atmospheric pressure in the stake intracavity reaches the second predetermined value, will the gas in the stake intracavity is discharged with the predetermined flow rate the stake chamber is in order to keep the atmospheric pressure in the stake intracavity is stabilized in the second predetermined range, the concrete grout is followed drainage channel gets into fill the intracavity and fill in fill the intracavity.
In the construction method for the diameter-expanding precast pile, gas is filled into the pile cavity to enable the elastic air bag to expand under the pressure action of air pressure, and after the elastic air bag expands, an expansion space can be formed around the side wall of the precast pile, soft soil around the precast pile can be compacted, the bearing capacity of the soft soil around the precast pile is improved, and the frictional resistance between the side wall of the precast pile and the surrounding soft soil is increased; after inflation, the air pressure in the pile cavity is detected, so that the difficulty in subsequent grouting caused by overhigh air pressure in the pile cavity can be prevented, or the deformation and collapse of soft soil on the side wall of the precast pile caused by overlow air pressure in the pile cavity can be prevented; when the pressure in the pile cavity is detected to be increased to a second preset value, the gas in the pile cavity is discharged from the pile cavity at a preset flow rate to keep the pressure in the pile cavity stable within a second preset range, so that the grouting difficulty can be reduced, the grouting is ensured to be carried out smoothly, and soft soil deformation and collapse of the side wall of the precast pile caused by too low pressure in the pile cavity in the exhaust process can be prevented; the concrete slurry in the filling cavity can be solidified and combined with the pile body into a whole, so that a concrete precast pile with an expansion section is formed in the soft soil, the concrete precast pile with the expansion section can transfer the upper load of the precast pile to a deep soil layer, the relative displacement between the precast pile and the soil layer and the settlement of the precast pile are reduced, and the bearing capacity of the soft soil foundation is obviously improved; when the diameter-expanding precast pile is provided with at least two elastic air bags along the length direction of the pile body, the concrete precast pile with at least two expanding sections can be formed in the soft soil, the upper load of the precast pile is more effectively transmitted to each soil layer in the deep part, and the bearing capacity of the soft soil foundation is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural view of an expanded diameter precast pile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a diameter-expanded precast pile according to an embodiment of the present invention, in which a filling medium is concrete slurry;
fig. 3 is a schematic diagram of the construction steps for expanding the precast pile according to an embodiment of the present invention;
fig. 4 is a schematic view of simultaneous construction of a plurality of prefabricated expanded-diameter piles according to an embodiment of the present invention.
Description of reference numerals:
10. expanding the precast pile; 20. soft soil; 30. a drain plate; 40. concrete slurry; 100. prefabricating a pile; 110. a pile body; 111. a pile cavity; 112. a drainage channel; 1121. an inlet end; 1122. an outlet end; 113. an open end; 120. pile head; 121. a through hole; 130. pile end; 200. an elastic air bag; 210. filling the cavity; 300. a fixing member; 400. a seal member; 500. an inflation tube; 510. an air pump; 600. a grouting pipe; 610. grouting equipment; 700. and (4) exhausting the gas.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Referring to fig. 1 to 3, an expanded precast pile 10 of an embodiment includes a precast pile 100 and an elastic air bag 200, the precast pile 100 includes a pile body 110, a pile cavity 111 is disposed inside the pile body 110, the pile body 110 is radially provided with a drainage channel 112, and the drainage channel 112 is used for communicating the pile cavity 111 with the outside; the elastic balloon 200 is sleeved on the side wall of the pile body 110 and is used for covering one end of the drainage channel 112 close to the outside, and the elastic balloon 200 is configured to be capable of expanding in a direction away from the precast pile 100 under the pressure of a filling medium introduced along the drainage channel 112 and to form a filling cavity 210 by enclosing with the side wall of the pile body 110.
When the diameter-expanded precast pile 10 is used, a filling medium is injected into the pile cavity 111, the filling medium enters a space formed by the elastic air bag 200 and the side wall of the pile body 110 in an enclosing manner along the drainage channel 112, the elastic air bag 200 expands in a direction away from the precast pile 100 under the pressure of the filling medium along with the increase of the filling medium, the filling cavity 210 is formed by the elastic air bag 200 and the side wall of the pile body 110 in an enclosing manner, and the filling medium is filled in the filling cavity 210. When the filling medium is the building material such as concrete slurry 40, the concrete slurry poured into the pile cavity 111 is condensed and then combined with the precast pile 100 into a whole, and the concrete slurry 40 filled in the filling cavity 210 is condensed and then combined with the precast pile 100 into a whole, so that the concrete precast pile with the expanded section is formed in the soft soil 20, the concrete precast pile with the expanded section can effectively transmit the upper load of the precast pile 100 to the deep soil layer, reduce the relative displacement between the precast pile 100 and the soil layer and the settlement of the precast pile 100, and remarkably improve the bearing capacity of the soft soil foundation; secondly, the concrete grout is solidified and combined with the precast pile 100 in the pile cavity 111, and the concrete grout 40 is solidified and combined with the precast pile 100 in the elastic air bag 200, so that the concrete grout 40 can be prevented from directly contacting with the soft soil 20 in the process of solidifying to form an expansion section, and the pile forming quality is ensured; in addition, the elastic air bag 200 can compact the soft soil 20 around the precast pile 100 in the expansion process, and effectively improve the bearing capacity and the pile side frictional resistance of the soft soil 20 around the precast pile 100.
In the above embodiments, the filling medium may be gas, concrete grout or any other filling medium that may be used during piling.
In some embodiments, the cross-section of the precast pile 100 may be circular, square or other shapes, which are selected according to the actual engineering needs. Preferably, the precast pile 100 is circular in cross-section, which reduces resistance of the pile body during driving into the soil.
In some embodiments, referring to fig. 1 to 3, the precast pile 100 further includes a pile head 120 and a pile end 130, the pile head 120 is connected to the top of the pile body 110, the pile end 130 is connected to the bottom of the pile body 110, the pile head 120 is provided with a through hole 121 for communicating the pile cavity 111 with the outside, and the diameter of the pile head 120 and the diameter of the pile end 130 are both greater than the diameter of the pile body 110. When the precast pile 100 is driven into the soft soil 20, the pile end 130 faces downward, the pile head 120 faces upward, and since the diameter of the pile end 130 and the diameter of the pile head 120 are both larger than the diameter of the pile body 110, an enlarged space can be formed on the side wall of the pile body 110 during the driving process, so that the elastic air bag 200 sleeved on the side wall of the pile body 110 is prevented from being rubbed with the surrounding soft soil 20 to fall off. In addition, the diameter of the pile head 120 is larger than that of the pile body 110, so that the contact area between the precast pile 100 and the pile driver is enlarged during the pile driving process, that is, the pile head 120 with a larger area is in direct contact with the pile driver, thereby reducing the pressure applied to the pile body 110 and preventing the pile body 110 from being broken during the pile driving process.
In some embodiments, referring to fig. 1 to 3, an end of the pile end 130 away from the pile body 110 is tapered, so that the resistance of the soil body near the pile end 130 to the precast pile 100 during the pile driving process can be effectively reduced. Further, the stub end 130 is a solid structure.
In some embodiments, referring to fig. 1 to fig. 3, the height of the inlet end 1121 of the drainage channel 112 relative to the bottom of the pile cavity 111 is greater than the height of the outlet end 1122 of the drainage channel 112 relative to the bottom of the pile cavity 111, so as to facilitate the filling medium in the pile cavity 111 to flow into the space defined by the elastic bladder 200 and the side wall of the pile body 110.
In some embodiments, the cross-sectional shape of the drainage channel 112 can be circular, oval, or polygonal, so long as the drainage channel 112 can be formed in the pile body 110. Preferably, the cross-sectional shape of the drainage channel 112 is circular.
In some embodiments, referring to fig. 1 to 3, at least two drainage channels 112 corresponding to one elastic bladder 200 are provided and distributed along the circumference of the pile body 110, so that the filling medium in the pile cavity 111 can flow into the space formed by the elastic bladder 200 and the side wall of the pile body 110 through the at least two drainage channels 112 simultaneously, thereby accelerating the expansion of the elastic bladder 200 and the formation of the enlarged section of the concrete precast pile. Further, the circumferential distance between two adjacent drainage channels 112 along the pile body 110 is determined according to the actual engineering requirements.
Preferably, referring to fig. 1 to 3, two drainage channels 112 are provided corresponding to one elastic balloon 200, and the two drainage channels 112 are uniformly distributed along the circumferential direction of the pile body 110.
In some embodiments, the elastic bladder 200 may be a bladder made of any of a variety of known elastic materials. Preferably, the elastic bladder 200 is a rubber bladder.
In some embodiments, referring to fig. 1 to 3, at least two elastic balloons 200 are provided, all the elastic balloons 200 are distributed along the length direction (L direction shown in fig. 1 to 3) of the pile body 110, at least two drainage channels 112 are provided along the length direction of the pile body 110, and the drainage channels 112 correspond to the elastic balloons 200 one to one. In this way, after the filling medium is injected into the pile cavity 111, at least two filling cavities 210 are formed, so that a concrete precast pile with at least two expanded sections is formed in the soft soil 20, the upper load of the precast pile 100 is more effectively transmitted to each soil layer in the deep part, the soft soil 20 around the precast pile 100 is further compacted, and the bearing capacity of the soft soil 20 foundation is obviously improved.
In some embodiments, referring to fig. 1 to 3, the diameter-expanded precast pile 10 further includes a fixing member 300, the fixing member 300 is sleeved at two ends of the elastic airbag 200 to fix the elastic airbag 200 to the pile body 110, and the fixing member 300 can prevent the elastic airbag 200 from moving along the length direction of the pile body 110 during the driving of the precast pile 100 into the soft soil 20, and on the one hand, is used to prevent a gap from occurring between the elastic airbag 200 and the side wall of the pile body 110 to leak the filling medium, and ensure the sealing performance of the space between the elastic airbag 200 and the side wall of the pile body 110.
Further, the fixing member 300 may be any type of fixing member known in the art, such as a steel band, a wire, etc.
Further, referring to fig. 1 to 3, two or more fixing members 300 may be respectively disposed at two ends of the elastic airbag 200 to enhance the fixing effect of the elastic airbag 200 and the sealing effect of the space between the elastic airbag 200 and the sidewall of the pile body 110.
In some embodiments, referring to fig. 1 to 3, the diameter-expanded precast pile 10 further includes a sealing member 400, one end of the pile cavity 111 is an open end 113, and the sealing member 400 is sealingly disposed at the open end 113 to ensure the sealing property inside the pile cavity 111.
Further, the sealing member 400 may be various types of existing sealing members, such as rubber, silicon rubber, etc.
In some embodiments, referring to fig. 1 to 3, the sealing member 400 may further seal a through hole 121 disposed at the pile head 120, the through hole 121 is used for communicating the pile cavity 111 with the outside, and the sealing member 400 disposed at the through hole 121 may also serve to seal the pile cavity 111. The location of the seal 400 is determined according to the actual engineering requirements.
In some embodiments, referring to fig. 1 to 4, the diameter-expanded precast pile 10 further includes an air filling pipe 500, a grouting pipe 600, and an air discharging pipe 700, where the air filling pipe 500, the grouting pipe 600, and the air discharging pipe 700 are all disposed through the sealing member 400, one end of the air filling pipe 500 is communicated with the pile cavity 111, the other end of the air filling pipe 500 is used for communicating with the outside, one end of the grouting pipe 600 is communicated with the pile cavity 111, the other end of the grouting pipe 600 is used for communicating with the outside, one end of the air discharging pipe 700 is communicated with the pile cavity 111, and the other end of the air discharging pipe 700 is used for communicating with the outside. When a gas type filling medium needs to be injected into the pile cavity 111, gas from the outside is injected into the pile cavity 111 through the gas filling pipe 500; when a liquid type or solid-liquid mixed filling medium needs to be injected into the pile cavity 111, liquid from the outside or the solid-liquid mixed filling medium is injected into the pile cavity 111 through the grouting pipe 600; when it is desired to exhaust the air from the stake cavity 111 to reduce pressure, the air inside the stake cavity 111 is vented to the environment through the exhaust tube 700.
Further, referring to fig. 1 to 4, an air pump 510 may be connected to one end of the air tube 500 for communicating with the outside, and a grouting device 610 may be connected to one end of the grouting tube 600 for communicating with the outside.
In some embodiments, the end of the exhaust pipe 700 for communicating with the outside is provided with an exhaust valve (not shown) for adjusting the air pressure in the stake cavity 111. When gas is injected into the pile cavity 111, the exhaust valve can adjust the air pressure to prevent the excessive air pressure inside the pile cavity 111 and further prevent other filling media from being injected, and can also prevent the soft soil 20 around the elastic air bag 200 from collapsing and deforming due to the fact that the elastic air bag 200 is shrunk due to the reduction of the air pressure.
On the other hand, referring to fig. 1 to 4, an embodiment further includes a construction method for the diameter-expanded precast pile 10 of any one of the foregoing embodiments, the construction method includes the following steps:
driving the expanded precast pile 10 to a predetermined depth of a soil layer;
filling gas into the pile cavity 111, wherein the gas enters between the elastic air bag 200 and the side wall of the pile body 110 along the drainage channel 112, and the elastic air bag 200 expands under the pressure of the gas and forms a filling cavity 210 by being surrounded with the side wall of the precast pile 100;
the air pressure in the pile cavity 111 is detected, the inflation is stopped when the air pressure in the pile cavity 111 reaches a first preset value, when the air pressure in the pile cavity 111 is stabilized to a first preset range, the concrete slurry 40 is poured into the pile cavity 111, when the air pressure in the pile cavity 111 reaches a second preset value, the air in the pile cavity 111 is discharged from the pile cavity 111 at a preset flow rate to keep the air pressure in the pile cavity 111 stable in a second preset range, and the concrete slurry 40 enters the filling cavity 210 along the drainage channel 112 and is filled in the filling cavity 210.
In the above construction method for expanding the precast pile 10, the interior of the pile cavity 111 is filled with gas so that the elastic air bag 200 expands under the pressure action of air pressure, and after the elastic air bag 200 expands, not only an expansion space can be formed around the side wall of the precast pile 100, but also the soft soil 20 around the precast pile 100 can be compacted, so that the bearing capacity of the soft soil 20 around the precast pile 100 is improved, and the frictional resistance between the side wall of the precast pile 100 and the surrounding soft soil 20 is increased; after inflation, the air pressure in the pile cavity 111 is detected, so that the subsequent grouting difficulty caused by overhigh air pressure in the pile cavity 111 can be prevented, or the soft soil deformation and collapse of the side wall of the precast pile 100 caused by overlow air pressure in the pile cavity 111 can be prevented; when the fact that the air pressure in the pile cavity 111 is increased to a second preset value is detected, the air in the pile cavity 111 is exhausted from the pile cavity 111 at a preset flow rate to keep the air pressure in the pile cavity 111 stable within a second preset range, so that grouting difficulty can be reduced, grouting is guaranteed to be carried out smoothly, and soft soil on the side wall of the precast pile 100 is prevented from deforming and collapsing due to the fact that the air pressure in the pile cavity 111 is too low in the exhausting process; the concrete grout 40 in the filling cavity 210 can be solidified and combined with the pile body 110 into a whole, so that a concrete precast pile with an expanded section is formed in the soft soil 20, the concrete precast pile with the expanded section can transfer the upper load of the precast pile 100 to a deep soil layer, the relative displacement between the precast pile 100 and the soil layer and the settlement of the precast pile 100 are reduced, and the bearing capacity of the soft soil foundation is obviously improved; when the expanded precast pile 10 is provided with at least two elastic airbags 200 along the length direction of the pile body 110, a concrete precast pile having at least two expanded sections can be formed in the soft soil 20, so that the upper load of the precast pile 100 is more effectively transmitted to each soil layer in the deep part, and the bearing capacity of the soft soil foundation is further improved.
In some embodiments, referring to fig. 3, before driving the diameter-expanded precast pile 10 into the soil layer, the drainage plate 30 is driven into a predetermined position, and the drainage plate 30 is used for performing a drainage function during driving the diameter-expanded precast pile 10, filling gas into the pile cavity 111, and the like, so as to reduce excess pore water pressure generated inside the soft soil 20 during driving the diameter-expanded precast pile 10 and filling gas, and thus reduce resistance encountered during driving the diameter-expanded precast pile 10 and filling gas, and the like.
In some embodiments, referring to fig. 1 to 4, by connecting the air-filling tube 500 with the air pump 510 to fill the interior of the pile cavity 111 with air, an air pressure control valve (not shown) is used to detect the air pressure in the pile cavity 111, and when the air pressure in the pile cavity 111 reaches a predetermined value, the air-filling is stopped, at this time, the elastic air bag 200 expands under the action of the air pressure in a direction away from the precast pile 100 and encloses with the side wall of the pile body 110 to form a filling cavity 210, and the elastic air bag 200 and the air in the filling cavity 210 squeeze the surrounding soil together; when the air pressure in the pile cavity 111 is stabilized to a preset range, connecting the grouting pipe 600 with grouting equipment 610, and injecting concrete slurry 40 into the pile cavity 111, wherein the pile cavity 111 and the filling cavity 210 are gradually filled with the concrete slurry 40; along with the progress of grouting, the air pressure in the pile cavity 111 continuously rises, when the air pressure in the pile cavity 111 reaches a set threshold value of the exhaust valve, the exhaust valve is opened to exhaust the air in the pile cavity 111 so as to maintain the constancy of the air pressure in the pile cavity 111, the situation that the concrete slurry 40 cannot be injected into the pile cavity 111 due to overhigh air pressure in the pile cavity 111 is prevented, and meanwhile, the exhaust valve can also prevent the collapse and deformation of the soft soil 20 around the elastic air bag 200 caused by the shrinkage of the elastic air bag 200 due to overlow air pressure in the pile cavity 111; the concrete slurry 40 in the filling cavity 210 is condensed with the concrete pile in the curing process to form the precast pile 100 with an enlarged section, so that the upper load of the precast pile 100 can be effectively transmitted to a deep soil layer, the relative displacement between the precast pile 100 and the soil layer and the settlement of the precast pile 100 are reduced, and the bearing capacity of the soft soil 20 foundation is obviously improved.
In some embodiments, referring to fig. 4, a plurality of prefabricated expanded diameter piles 10 can be simultaneously inflated and grouted, so as to improve the construction efficiency.
In some embodiments, the outer wall surface of the portion of the pile body 110 that is sleeved with the flexible bladder 200 is roughened to better integrate the concrete slurry 40 in the filling cavity 210 with the pile body during the setting process.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "communicating," "fixed," and the like are to be construed broadly, e.g., as meaning in fixed communication, in removable communication, or as an integral part; either mechanically or electrically; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "coupled" to another element, it can be directly coupled to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An expanded diameter precast pile, comprising:
the precast pile comprises a pile body, a pile cavity is arranged in the pile body, a drainage channel is arranged in the pile body along the radial direction, and the drainage channel is used for communicating the pile cavity with the outside;
the elastic air bag is sleeved on the side wall of the pile body and used for covering one end, close to the outside, of the drainage channel, and the elastic air bag is configured to be capable of expanding along the direction away from the precast pile under the pressure action of a filling medium introduced along the drainage channel and form a filling cavity with the side wall of the pile body in an enclosing mode.
2. The expanded diameter precast pile according to claim 1, wherein the height of the inlet end of the drainage channel relative to the bottom of the pile cavity is greater than the height of the outlet end of the drainage channel relative to the bottom of the pile cavity.
3. The expanded diameter precast pile according to claim 1, further comprising fixing members, wherein the fixing members are sleeved at both ends of the elastic air bag to fix the elastic air bag to the pile body.
4. The expanded diameter precast pile according to claim 1, further comprising a sealing member, wherein one end of the pile cavity is an open end, and the sealing member is arranged at the open end in a sealing manner.
5. The diameter-expanding precast pile according to claim 4, further comprising an inflation tube, a grouting tube and an exhaust tube, wherein the inflation tube, the grouting tube and the exhaust tube are all arranged through the sealing element, one end of the inflation tube is communicated with the pile cavity, the other end of the inflation tube is used for being communicated with the outside, one end of the grouting tube is communicated with the pile cavity, the other end of the grouting tube is used for being communicated with the outside, one end of the exhaust tube is communicated with the pile cavity, and the other end of the exhaust tube is used for being communicated with the outside.
6. The expanded diameter precast pile according to claim 5, wherein one end of the exhaust pipe for communicating with the outside is provided with an exhaust valve for adjusting air pressure in the pile cavity.
7. The expanded-diameter precast pile according to claim 1, further comprising a pile head and a pile end, wherein the pile head is connected with the top of the pile body, the pile end is connected with the bottom of the pile body, the pile head is provided with a through hole for communicating the pile cavity with the outside, and the diameter of the pile head and the diameter of the pile end are both larger than the diameter of the pile body.
8. The expanded diameter precast pile according to claim 7, wherein the end of the pile tip away from the pile body is tapered.
9. The expanded-diameter precast pile according to any one of claims 1 to 8, wherein the number of the elastic air bags is at least two, all the elastic air bags are distributed along the length direction of the pile body, the number of the drainage channels is at least two along the length direction of the pile body, and the drainage channels correspond to the elastic air bags one by one.
10. A construction method for an expanded diameter precast pile according to any one of claims 1 to 9, comprising the steps of:
driving the expanded precast pile to a preset depth of a soil layer;
filling gas into the pile cavity, wherein the gas enters between the elastic air bag and the side wall of the pile body along the drainage channel, and the elastic air bag expands under the pressure of the gas and forms the filling cavity by being surrounded with the side wall of the precast pile;
detect the atmospheric pressure in the stake intracavity, work as stop to aerify after the atmospheric pressure in the stake intracavity reaches first predetermined value, and when treating atmospheric pressure in the stake intracavity is stabilized to first predetermined range, to the inside concrete grout that fills of stake chamber, work as after the atmospheric pressure in the stake intracavity reaches the second predetermined value, will the gas in the stake intracavity is discharged with the predetermined flow rate the stake chamber is in order to keep the atmospheric pressure in the stake intracavity is stabilized in the second predetermined range, the concrete grout is followed drainage channel gets into fill the intracavity and fill in fill the intracavity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115324033A (en) * | 2022-08-16 | 2022-11-11 | 中天建设集团有限公司 | Precast tubular pile construction method based on built-in high-expansion material self-expansion pile shoe structure |
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| CN209854705U (en) * | 2019-04-26 | 2019-12-27 | 福建省龙湟市政工程有限公司 | Cement soil inserted PHC tubular pile bag grouting expanding pile |
| CN112982363A (en) * | 2021-03-08 | 2021-06-18 | 天津大学 | Rubber bag type grouting compaction pile applied to soft soil foundation reinforcement and piling method |
| CN113653041A (en) * | 2021-09-17 | 2021-11-16 | 河海大学 | Expanded casing concrete pile and construction method thereof |
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2021
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209854705U (en) * | 2019-04-26 | 2019-12-27 | 福建省龙湟市政工程有限公司 | Cement soil inserted PHC tubular pile bag grouting expanding pile |
| CN112982363A (en) * | 2021-03-08 | 2021-06-18 | 天津大学 | Rubber bag type grouting compaction pile applied to soft soil foundation reinforcement and piling method |
| CN113653041A (en) * | 2021-09-17 | 2021-11-16 | 河海大学 | Expanded casing concrete pile and construction method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115324033A (en) * | 2022-08-16 | 2022-11-11 | 中天建设集团有限公司 | Precast tubular pile construction method based on built-in high-expansion material self-expansion pile shoe structure |
| CN115324033B (en) * | 2022-08-16 | 2024-04-12 | 中天建设集团有限公司 | Prefabricated pipe pile construction method based on built-in high-expansion material self-expanding pile shoe structure |
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