CN214423346U - Pile bottom high-pressure rotary spraying expanding head structure of rotary drilling bored concrete pile - Google Patents
Pile bottom high-pressure rotary spraying expanding head structure of rotary drilling bored concrete pile Download PDFInfo
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- CN214423346U CN214423346U CN202120043295.6U CN202120043295U CN214423346U CN 214423346 U CN214423346 U CN 214423346U CN 202120043295 U CN202120043295 U CN 202120043295U CN 214423346 U CN214423346 U CN 214423346U
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Abstract
The utility model provides a rotary digging pore-forming bored concrete pile bottom high pressure jet grouting enlarged head structure, which comprises a rotary digging pore-forming bored concrete pile, a hole leading channel, a high pressure jet grouting pipe and a high pressure jet grouting enlarged head; the high-pressure rotary-spraying grouting pipe is placed on the constructed cast-in-place pile through the hole guiding channel, high-pressure rotary-spraying cement slurry is carried out on the soil layer at the pile end of the rotary-excavated cast-in-place pile, so that a high-pressure rotary-spraying enlarged head is formed, the requirement on a pile end bearing layer under complex geological conditions is met and reduced, the length of the cast-in-place pile is greatly reduced, and the construction cost is saved; meanwhile, the high-pressure rotary jet grouting is carried out on the pile end, so that the sediment is further reduced or eliminated, and the bearing capacity of the single pile is improved; the pile bottom high-pressure rotary spraying enlarged head structure of the rotary drilling bored concrete pile can be applied, the constructed bored concrete pile can be reinforced, and the bearing capacity of a single pile is further improved.
Description
Technical Field
The utility model relates to a foundation engineering technical field, in particular to dig pore-forming bored concrete pile end high pressure soon and spout and enlarge head structure soon.
Background
In the field of geotechnical engineering, the rotary excavation hole-forming cast-in-place pile has high bearing capacity and strong penetrating power of rotary excavation equipment, and is widely applied to foundation treatment and pile foundation construction. The rotary-digging bored concrete pile requires that the pile end is stable and the bearing layer burial depth is larger in design, and the pile body length of the rotary-digging bored concrete pile is large, the bearing capacity of a single pile is low, and the construction cost is high under the complex geological condition that the bearing capacity of the pile end does not meet the design requirements and the pile is laid. The larger the construction length of the rotary-excavated cast-in-place pile is, the more easily the situations that the integrity and the bearing capacity of the pile body cannot meet the design requirements, such as large thickness of sediment at the pile end, separation of the pile body, and incapability of detecting the bearing capacity of a single pile, occur. When similar conditions occur, the bearing capacity of a single pile can only be reduced to use or re-supplement the pile, and the construction period and the construction cost can be increased.
Therefore, a rotary-excavated hole-filling pile structure capable of reducing the requirement on a pile end bearing layer under the condition of ensuring a certain effective pile length is needed, so that the pile length of the rotary-excavated hole-filling pile is reduced, and the aim of saving the construction cost is fulfilled; meanwhile, a structure capable of reinforcing the constructed rotary-excavated hole-forming cast-in-place pile is also needed, so that the bearing capacity of a single pile is improved.
SUMMERY OF THE UTILITY MODEL
In order to achieve the purpose, the utility model provides a rotary digging pore-forming bored concrete pile bottom high-pressure jet grouting enlarged head structure, which comprises a rotary digging pore-forming bored concrete pile, a hole leading channel, a high-pressure jet grouting pipe and a high-pressure jet grouting enlarged head, wherein the rotary digging pore-forming bored concrete pile is shaped like a cylinder and is arranged in a soil body at the lower part of a building foundation, a rotary digging pile machine is adopted for pore-forming, and a reinforcement cage is placed after pore-forming and concrete is poured for maintenance to manufacture the hole-forming bored concrete pile;
the hole guiding channel is arranged in a pile body of the rotary-digging bored concrete pile and soil below the pile end, the hole guiding channel is formed in the way of a pre-buried pipe in the pile body of the rotary-digging bored concrete pile, and a hole guiding drilling machine is used for guiding holes of a pile bottom soil layer through the hole guiding channel of the pile body of the rotary-digging bored concrete pile at the position below the pile end of the rotary-digging bored concrete pile; the high-pressure rotary jet grouting pipe is arranged in the hole guiding channel and penetrates through the hole guiding channel of the pile body of the rotary-excavated hole-forming cast-in-place pile and the hole guiding channel in the soil body below the pile end;
the high-pressure jet grouting enlarged head is arranged at the bottom of the jet-dug bored pile, is formed by mixing slurry injected from the bottom to the top by a high-pressure jet grouting drill through a high-pressure jet grouting pipe and soil at the bottom of the jet-dug bored pile, and is solidified to form the high-pressure jet grouting enlarged head.
Further, the diameter of the outer circumferential surface of the rotary-excavated hole-forming cast-in-place pile is larger than or equal to 600 mm.
Further, based on the bearing capacity requirement and the soil characteristic requirements of the side face of the high-pressure jet grouting enlarged head and the pile end bearing layer, the ratio of the diameter of the high-pressure jet grouting enlarged head to the diameter of the outer circumferential face of the jet-excavated bored concrete pile ranges from 1 to 3.
Furthermore, in order to ensure the plugging effect of the hole leading channel and increase the connection strength between the high-pressure jet grouting enlarged head and the jet grouting pile, the pile bottom high-pressure jet grouting enlarged head structure of the jet grouting pile further comprises a pile core filling body, the pile core filling body is arranged in the hole leading channel of the jet grouting pile, the pile core filling body is prepared by mixing high-pressure jet grouting body injected into the hole leading channel inside the jet grouting pile by a high-pressure jet drilling machine through a high-pressure jet grouting pipe and graded sandstone filled into the hole leading channel of the jet grouting pile after grouting is finished, and the pile core filling body is formed after solidification; the pile core filling body and the high-pressure jet grouting enlarged footing are integrally cast.
Furthermore, it spouts enlarged head structure soon to dig hole-forming bored concrete pile bottom high pressure still includes concrete cushion, basis or cushion cap soon, the concrete cushion sets up in basis or cushion cap below, it passes inside the concrete cushion gets into the cushion cap to dig hole-forming bored concrete pile soon, dig hole-forming bored concrete pile and basis or cushion cap fixed connection soon.
Furthermore, the high-pressure rotary-spraying grouting pipe is cylindrical, and a hole guiding channel through which a high-pressure rotary-spraying grouting drill rod passes is arranged in the rotary-digging hole-forming grouting pile.
Furthermore, factors such as the diameter of the bored pile and the high-pressure jet grouting enlarged head, the geological conditions of the pile end and the like are comprehensively and spirally excavated, and the number of the hole guiding channels is more than or equal to 1 and less than or equal to 6.
The utility model discloses a beneficial effect does: the utility model provides a dig pore-forming bored concrete pile end high pressure soon and spout and enlarge head structure soon, put into high pressure through the draw hole passageway on digging pore-forming bored concrete pile soon that construction was accomplished and spout the slip casting pipe soon, carry out high pressure jet grouting to bored concrete pile end soil layer and spout the grout soon, form high pressure and spout enlarged footing soon, satisfy and reduce the requirement on complicated geological conditions lower pile end holding force layer, reduce bored concrete pile length by a wide margin, practice thrift engineering cost. And through high-pressure jet grouting of the pile end, sediment is further reduced or eliminated, and the bearing capacity of the single pile is improved. The pile bottom high-pressure rotary spraying enlarged head structure of the rotary drilling bored concrete pile can be applied, the constructed bored concrete pile can be reinforced, and the bearing capacity of a single pile is further improved.
Drawings
Fig. 1 is a schematic view of a pile bottom high-pressure jet grouting enlarged head structure of a rotary drilling bored concrete pile.
In the figure: 1. the method comprises the following steps of (1) foundation or bearing platform, (2) hole leading channel, (3) high-pressure jet grouting pipe, (4) hole digging cast-in-place pile, (5) high-pressure jet grouting enlarged head, (6) pile core filling body, and (7) concrete cushion.
Detailed Description
The invention will be described in further detail with reference to the embodiment of fig. 1. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
The pile bottom high-pressure jet grouting enlarged head structure of the rotary-excavated pore-forming cast-in-place pile comprises a foundation or a bearing platform 1, a hole guiding channel 2, a high-pressure jet grouting pipe 3, a rotary-excavated pore-forming cast-in-place pile 4, a high-pressure jet grouting enlarged head 5, a pile core filling body 6 and a concrete cushion 7;
the rotary-excavated cast-in-situ pile 4 is cylindrical and has a diameter larger than or equal to 600 mm; the rotary digging hole-forming cast-in-place pile 4 adopts a rotary digging pile machine to form a hole, lower a reinforcement cage and pour concrete for curing and forming, and is connected with a building foundation or a bearing platform 1;
the hole guiding channel 2 is arranged in a pile body of the rotary-excavated pore-forming cast-in-place pile 4 and soil below the pile end, the hole guiding channel 2 is formed in a pre-buried pipe mode at the position of the pile body of the rotary-excavated pore-forming cast-in-place pile 4, and a hole guiding drilling machine is used for guiding a hole to a pile bottom soil layer through the hole guiding channel 2 of the pile body of the rotary-excavated pore-forming cast-in-place pile 4 at the position of the soil below the pile end of the rotary-excavated pore-forming cast-in-place pile 4; the high-pressure rotary jet grouting pipe 3 penetrates through a pile body hole guiding channel 2 of a rotary-excavated cast-in-situ pile 4 and a hole guiding channel 2 in soil below a pile end;
the high-pressure jet grouting enlarged head 5 is arranged at the bottom of the jet-drilled bored pile 4, the high-pressure jet grouting enlarged head 5 is prepared by mixing slurry injected from bottom to top by a high-pressure jet grouting machine through a high-pressure jet grouting pipe 3 with soil at the bottom of the jet-drilled bored pile 4, and the high-pressure jet grouting enlarged head 5 is formed after solidification;
the pile core filling body 6 is arranged in the hole leading channel 2 of the rotary-excavated hole-forming cast-in-place pile 4, the pile core filling body 6 is prepared by mixing high-pressure rotary-jet grouting bodies injected into the hole leading channel inside the rotary-excavated hole-forming cast-in-place pile 4 by a high-pressure rotary-jet drilling machine through a high-pressure rotary-jet grouting pipe 3 and graded sandstone filled into the hole leading channel 2 of the rotary-excavated hole-forming cast-in-place pile 4 after grouting is finished, and the pile core filling body 6 is formed after solidification; the pile core filling body 6 and the high-pressure jet grouting enlarged footing 5 are cast together;
after the pile core filling body 6 and the high-pressure jet grouting expansion head 5 are maintained until the strength meets the design requirements, pouring a concrete cushion 7, and pouring a foundation or a bearing platform 1 on the concrete cushion 7; the rotary-excavated hole-forming cast-in-place pile 4 penetrates through the concrete cushion 7 to enter the foundation or the bearing platform 1, and the rotary-excavated hole-forming cast-in-place pile 4 is fixedly connected with the foundation or the bearing platform 1.
The construction method of the pile bottom high-pressure jet grouting enlarged head structure of the rotary drilling bored concrete pile comprises the following steps:
(1) measuring line
Measuring the pile position coordinates and the elevation of the construction site by using an RTK (real-time kinematic) or total station, and determining the position and the depth of the spirally-excavated bored pile 4;
(2) rotary drilling hole, pre-buried pipe as hole guiding channel, lowering steel bar cage and pouring concrete
The hole is dug soon to the design degree of depth with digging the rig soon, combines the steel reinforcement cage to set up the buried pipe as the pilot hole passageway, lifts by crane the steel reinforcement cage to digging soon the drilling of pore-forming in, lays the steel reinforcement cage in time pour the concrete and maintain the shaping after promptly and promptly dig into hole bored concrete pile 4 soon.
(3) Forming a through hole channel 2 and inserting a high-pressure rotary jet grouting pipe 3
Straightening, leveling and stabilizing the engineering drilling machine, ensuring that the center of a drill rod of the engineering drilling machine is superposed with the center of a pre-embedded pipe of the rotary-excavated hole-forming cast-in-place pile 4, inserting the channel formed by the pre-embedded pipe to a pile foundation layer, drawing out the drill rod after the hole is led to the designed depth to form a through hole leading channel 2, and inserting a high-pressure rotary-jet grouting pipe 3 into the hole leading channel 2;
(4) the high-pressure rotary jet drilling machine is in place, and high-pressure rotary jet grouting is carried out to form a high-pressure rotary jet expanded head 5
Straightening, leveling and stabilizing a high-pressure rotary jet drilling machine, inserting a high-pressure rotary jet drilling rod into the bottom of a high-pressure rotary jet grouting pipe 3, performing high-pressure rotary jet grouting from bottom to top, and controlling the grouting pressure, the drilling speed and the lifting speed of the high-pressure rotary jet drilling machine to form a high-pressure rotary jet expanded head 5;
(5) mixing graded sand and stone uniformly to prepare a pile core filling body 6, and obtaining the high-pressure jet grouting enlarged footing structure 5 and the pile core filling body 6 through natural maintenance
After the grouting of the high-pressure jet grouting enlarged footing 5 is finished, continuously injecting the high-pressure jet grouting body into the hole leading channel 2 inside the jet-drilled bored concrete pile 4, and after the pile top position of the jet-drilled bored concrete pile 4 is reached, filling graded sandstone into the hole leading channel 2 inside the jet-drilled bored concrete pile 4 and vibrating and mixing uniformly to form a pile core filling body 6; and (4) naturally maintaining, and after the strength of the high-pressure rotary spraying enlarged footing 5 and the pile core filling body 6 reaches the design value and is qualified through detection and acceptance, constructing a concrete cushion 7 and a foundation or a bearing platform 1 to obtain a finished product of the pile bottom high-pressure rotary spraying enlarged footing structure of the rotary-digging cast-in-place pile.
Meanwhile, according to the high-pressure jet grouting enlarged head structure at the bottom of the rotary drilling bored concrete pile of the embodiment, the construction method can be adopted according to actual construction needs, the high-pressure jet grouting enlarged head 5 can be manufactured firstly, the rotary drilling bored concrete pile 4 is arranged on the high-pressure jet grouting enlarged head 5, although the construction sequence of the two is not consistent, the finally manufactured high-pressure jet grouting enlarged head structure at the bottom of the rotary drilling bored concrete pile of the embodiment is adopted. The structure is also suitable for the high-pressure rotary spraying enlarged head structure of the impact hole-forming cast-in-place pile.
Claims (7)
1. A pile bottom high-pressure jet grouting enlarged head structure of a rotary-digging pore-forming cast-in-place pile is characterized by comprising a rotary-digging pore-forming cast-in-place pile, a hole guiding channel, a high-pressure jet grouting pipe and a high-pressure jet grouting enlarged head, wherein the rotary-digging pore-forming cast-in-place pile is cylindrical, is arranged in a soil body at the lower part of a building foundation, adopts a rotary digging pile machine to form pores, and transfers a reinforcement cage after pore-forming and pours concrete for maintenance to manufacture the structure;
the hole guiding channel is arranged in a pile body of the rotary-digging bored concrete pile and soil below the pile end, the hole guiding channel is formed in the way of a pre-buried pipe in the pile body of the rotary-digging bored concrete pile, and a hole guiding drilling machine is used for guiding holes of a pile bottom soil layer through the hole guiding channel of the pile body of the rotary-digging bored concrete pile at the position below the pile end of the rotary-digging bored concrete pile;
the high-pressure rotary jet grouting pipe is arranged in the hole guiding channel and penetrates through the hole guiding channel of the pile body of the rotary-excavated hole-forming cast-in-place pile and the hole guiding channel in the soil body below the pile end;
the high-pressure jet grouting enlarged head is arranged at the bottom of the jet-dug bored pile, is formed by mixing slurry injected from the bottom to the top by a high-pressure jet grouting drill through a high-pressure jet grouting pipe and soil at the bottom of the jet-dug bored pile, and is solidified to form the high-pressure jet grouting enlarged head.
2. The pile bottom high-pressure jet grouting enlarged head structure of the rotary excavating hole-forming cast-in-place pile according to claim 1, wherein the diameter of the outer circumferential surface of the rotary excavating hole-forming cast-in-place pile is greater than or equal to 600 mm.
3. The pile bottom high-pressure jet grouting enlarged head structure of the rotary-digging hole-forming cast-in-place pile according to claim 1, wherein the ratio of the diameter of the high-pressure jet grouting enlarged head to the diameter of the outer circumferential surface of the rotary-digging hole-forming cast-in-place pile is 1-3.
4. The pile bottom high-pressure jet grouting expansion head structure of the rotary excavating hole-forming cast-in-place pile according to claim 1, characterized in that the pile bottom high-pressure jet grouting expansion head structure of the rotary excavating hole-forming cast-in-place pile further comprises a pile core filling body, the pile core filling body is arranged in a hole leading channel of the rotary excavating hole-forming cast-in-place pile, the pile core filling body is formed by mixing high-pressure jet grouting body injected into the hole leading channel inside the rotary excavating hole-forming cast-in-place pile through a high-pressure jet grouting pipe by a high-pressure jet grouting machine and graded sandstone filled into the hole leading channel of the rotary excavating hole-forming cast-in-place pile after grouting is completed, and the pile core filling body is formed after solidification; the pile core filling body and the high-pressure jet grouting enlarged footing are cast together.
5. The pile bottom high-pressure jet grouting enlarged head structure of the rotary excavating hole-forming cast-in-place pile according to claim 1, wherein the pile bottom high-pressure jet grouting enlarged head structure of the rotary excavating hole-forming cast-in-place pile further comprises a concrete cushion layer, a foundation or a bearing platform, the concrete cushion layer is arranged below the foundation or the bearing platform, the rotary excavating hole-forming cast-in-place pile penetrates through the concrete cushion layer and enters the interior of the foundation or the bearing platform, and the rotary excavating hole-forming cast-in-place pile is fixedly connected with the foundation or the bearing platform.
6. The pile bottom high-pressure jet grouting enlarged head structure of the rotary excavating hole-forming cast-in-place pile of claim 1, wherein the high-pressure jet grouting pipe is cylindrical, and a hole guiding channel for a high-pressure jet grouting drill rod to pass through is arranged inside the rotary excavating hole-forming cast-in-place pile.
7. The pile bottom high-pressure jet grouting enlarged head structure of the rotary excavating hole-forming cast-in-place pile of claim 1, wherein the number of the hole guiding channels is greater than or equal to 1 and less than or equal to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120043295.6U CN214423346U (en) | 2021-01-08 | 2021-01-08 | Pile bottom high-pressure rotary spraying expanding head structure of rotary drilling bored concrete pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120043295.6U CN214423346U (en) | 2021-01-08 | 2021-01-08 | Pile bottom high-pressure rotary spraying expanding head structure of rotary drilling bored concrete pile |
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| CN214423346U true CN214423346U (en) | 2021-10-19 |
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| CN202120043295.6U Active CN214423346U (en) | 2021-01-08 | 2021-01-08 | Pile bottom high-pressure rotary spraying expanding head structure of rotary drilling bored concrete pile |
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- 2021-01-08 CN CN202120043295.6U patent/CN214423346U/en active Active
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