CN112726583A - Construction method for drilling prefabricated composite pile - Google Patents
Construction method for drilling prefabricated composite pile Download PDFInfo
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- CN112726583A CN112726583A CN202011544522.XA CN202011544522A CN112726583A CN 112726583 A CN112726583 A CN 112726583A CN 202011544522 A CN202011544522 A CN 202011544522A CN 112726583 A CN112726583 A CN 112726583A
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- pile
- prefabricated
- steel bars
- pipe
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 238000004873 anchoring Methods 0.000 claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a construction method of a drilling prefabricated composite pile, which belongs to the technical field of foundation pile construction and comprises the following steps: after cement slurry is filled in the pile hole, the precast tubular pile is sunk into the pile hole, and pipe holes at two ends of the precast tubular pile are connected with plugging devices; after cement paste in the pile hole is solidified, excavating earthwork between the precast tubular pile and the ground surface, and exposing the pile top of the precast tubular pile; removing the plugging device plugged at the pile top, and injecting high-strength grouting material into the pipe core of the precast pipe pile; and embedding anchoring steel bars at the pile top. The process of embedding the anchoring steel bars is placed after the earthwork is excavated, the construction of the anchoring steel bars can be visually controlled, the embedding position of the anchoring steel bars is ensured to be accurate, the verticality is well controlled, the labor intensity is reduced, the loss of the steel bars is reduced, and the damage to the steel bars caused by improper operation during mechanical excavation is avoided.
Description
Technical Field
The invention relates to the technical field of foundation pile construction, in particular to a construction method of a drilling prefabricated composite pile.
Background
A drilling prefabricated composite pile is a foundation pile construction technology applied to industrial and civil building engineering. The current implementation method comprises the following steps: after cement slurry is filled in the pile hole, sinking the prefabricated pipe pile into the pile hole, and filling the slurry into the pile hole after the pipe pile is in place; and laying the anchoring steel bars prefabricated according to the design requirements for subsequent construction and connecting with the bearing platform steel bars.
The designed elevation of the pile top of the tubular pile is usually below the underground depth of-1.5 m, the lowered elevation cannot be accurately guaranteed in the process of lowering the anchoring steel bar, and the control over the verticality is difficult. In actual construction, the situation that anchoring steel bars are not firmly bound exists, so that the longitudinal bars can be carelessly dropped into cement paste during operation and cannot be discovered; only when the bearing platform is constructed, the excavation can be found after the pile head is exposed, so that reinforcement treatment needs to be carried out through modes such as bar planting, and hidden danger is left to engineering quality. When the foundation bearing platform is constructed, an excavator is needed to carry out large excavation and break away solidified cement paste between a pile head and the ground so as to expose the pile head and the anchoring reinforcing steel bars, but in the excavation process, the anchoring reinforcing steel bars exposing the pile head are damaged due to careless operation of the excavator or workers, so that reinforcing steel bars are needed to be reinforced in the modes of bar planting and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the installation difficulty of the anchoring steel bar is high and the anchoring steel bar is easy to damage in the process of excavating and removing the earth in the prior art, thereby providing the construction method of the drilling and prefabricating composite pile.
In order to solve the technical problem, the construction method of the drilling prefabricated composite pile provided by the invention comprises the following steps:
after cement slurry is filled in the pile hole, sinking the precast tubular pile into the pile hole, wherein pipe holes at two ends of the precast tubular pile are connected with plugging devices;
after cement paste in the pile hole is solidified, excavating earthwork between the precast tubular pile and the ground surface, and exposing the pile top of the precast tubular pile;
removing the plugging device plugged at the pile top, and injecting high-strength grouting material into the pipe core of the precast pipe pile; and embedding anchoring steel bars at the pile top.
According to the preferable scheme, after the precast tubular pile is sunk into the pile hole, cement slurry is filled between the side wall of the precast tubular pile and the wall of the pile hole.
And as an optimal scheme, after the precast tubular pile is sunk into the pile hole, carrying out high-frequency vibration on the precast tubular pile by using a knock-out machine.
Preferably, the construction of the pile hole includes: after the drilling machine is in place, a drill bit drills downwards into a designed bearing stratum; the high-pressure pump presses the cement paste to a nozzle of the drill bit, so that the cement paste is sprayed out through the nozzle of the drill bit; and (4) spraying cement slurry while lifting the drill bit until the pile hole is filled with the cement slurry.
Preferably, the pressure value of the cement slurry discharged from the drill nozzle is 5-15 MPa.
Preferably, the water-cement ratio of the cement paste ranges from 0.6 to 0.8.
As the preferred scheme, the plugging device is a plugging plate, and the plugging plate is connected to the end part of the precast tubular pile through a bolt.
The technical scheme of the invention has the following advantages:
1. according to the construction method of the drilling prefabricated composite pile, when the prefabricated pipe pile is sunk into the pile hole, pipe holes at two ends of the prefabricated pipe pile are in a blocking state, so that cement paste cannot enter the pipe core; after the cement paste is cured, excavating earthwork, exposing the pile top of the prefabricated pipe pile, removing the plugging device, and injecting high-strength grouting material into the pipe core; the cement paste can shrink after being cured, so that the bonding strength between the cement paste at the pipe core and the inner wall of the pipe pile can be weakened; the high-strength grouting material has the characteristics of no shrinkage, micro expansion and high upper strength, replaces cement paste, can ensure closer contact between the high-strength grouting material and the inner wall of the pipe pile, and enhances the pulling resistance of the precast pipe pile. The process of embedding the anchoring steel bars is placed after the earthwork is excavated, the construction of the anchoring steel bars can be visually controlled, the embedding positions of the anchoring steel bars are ensured to be accurate, the verticality is well controlled, the labor intensity is reduced, the loss of the steel bars is reduced, and the damage to the steel bars caused by improper operation during mechanical excavation is avoided.
2. The construction method of the drilling prefabricated composite pile provided by the invention is characterized in that cement slurry is supplemented between the side wall of the prefabricated tubular pile and the wall of the pile hole, so that the cement slurry still permeates into a stratum before final setting, and the side wall of the prefabricated tubular pile is tightly combined with a soil body.
3. According to the construction method of the drilling prefabricated composite pile, after the tubular pile is sunk into the pile hole, the driving and pulling machine is started to carry out high-frequency vibration striking on the tubular pile, so that the pile bottom and the sandy soil near the pile bottom are liquefied and damaged, cement paste continuously penetrates deeply, the prefabricated tubular pile extrudes the soil body to sink, and a pile bottom bearing layer is further strengthened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a construction method of a bored composite pile according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The construction method of the bored composite pile provided in the embodiment, as shown in fig. 1, includes the following steps:
the method comprises the following steps: after the drilling machine is in place, a drill bit drills downwards into a designed bearing stratum; the high-pressure pump presses the cement paste to a nozzle of the drill bit, so that the cement paste is sprayed out through the nozzle of the drill bit; and (4) spraying cement slurry while lifting the drill bit until the pile hole is filled with the cement slurry. The pressure value of cement paste discharged from a nozzle of the drill bit is 5-15 MPa, and the water-cement ratio of the cement paste ranges from 0.6 to 0.8.
Step two: after cement slurry is filled in the pile hole, sinking the precast tubular pile into the pile hole, wherein pipe holes at two ends of the precast tubular pile are connected with plugging devices; the plugging device is a plugging plate, and the plugging plate is connected to the end part of the precast tubular pile through a bolt;
after the precast tubular pile is sunk into the pile hole, a pulling machine is used for carrying out high-frequency vibration on the precast tubular pile to ensure that the sand at the bottom of the pile and the sand near the bottom of the pile are liquefied and damaged, cement paste continuously penetrates deeply, and the precast tubular pile extrudes the soil body to sink so as to further strengthen the bearing layer at the bottom of the pile;
after the prefabricated tubular pile is sunk into the pile hole, cement paste is filled between the prefabricated tubular pile side wall and the pile hole wall, so that the cement paste still permeates into the stratum before final setting, and the prefabricated tubular pile side wall is tightly combined with a soil body.
Step three: and after cement paste in the pile hole is solidified, excavating earthwork between the precast tubular pile and the earth surface, and exposing the pile top of the precast tubular pile.
Step four: removing the plugging device plugged at the pile top, and injecting high-strength grouting material into the pipe core of the precast pipe pile; and embedding anchoring steel bars at the pile top.
The construction steps can visually control the construction of the anchoring steel bars after the procedure of embedding the anchoring steel bars is placed after the earthwork is excavated, ensure the embedding position of the anchoring steel bars to be accurate and well control the verticality, simultaneously reduce the labor intensity, reduce the loss of the steel bars and avoid the damage to the steel bars caused by improper operation during mechanical excavation. When the precast tubular pile is sunk into the pile hole, the pipe holes at the two ends of the precast tubular pile are in a blocking state, so that cement paste cannot enter the pipe core; after the cement paste is cured, excavating earthwork, exposing the pile top of the prefabricated pipe pile, removing the plugging device, and injecting high-strength grouting material into the pipe core; the cement paste can shrink after being cured, so that the bonding strength between the cement paste at the pipe core and the inner wall of the pipe pile can be weakened; the high-strength grouting material has the characteristics of no shrinkage, micro expansion and high upper strength, replaces cement paste, can ensure closer contact between the high-strength grouting material and the inner wall of the pipe pile, and enhances the pulling resistance of the precast pipe pile.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A construction method for drilling a prefabricated composite pile is characterized by comprising the following steps:
after cement slurry is filled in the pile hole, sinking the precast tubular pile into the pile hole, wherein pipe holes at two ends of the precast tubular pile are connected with plugging devices;
after cement paste in the pile hole is solidified, excavating earthwork between the precast tubular pile and the ground surface, and exposing the pile top of the precast tubular pile;
removing the plugging device plugged at the pile top, and injecting high-strength grouting material into the pipe core of the precast pipe pile; and embedding anchoring steel bars at the pile top.
2. The construction method of the bored composite pile according to claim 1, wherein cement paste is added between the side wall of the prefabricated tubular pile and the wall of the pile hole after the prefabricated tubular pile is sunk into the pile hole.
3. The construction method of the bored and prefabricated composite pile according to claim 1, wherein after the prefabricated pipe pile is sunk into the pile hole, the prefabricated pipe pile is subjected to high-frequency vibration striking by a striking and pulling machine.
4. The method of constructing a bored composite pile according to claim 1, wherein the construction of the pile hole includes: after the drilling machine is in place, a drill bit drills downwards into a designed bearing stratum; the high-pressure pump presses the cement paste to a nozzle of the drill bit, so that the cement paste is sprayed out through the nozzle of the drill bit; and (4) spraying cement slurry while lifting the drill bit until the pile hole is filled with the cement slurry.
5. The construction method of the bored and prefabricated composite pile according to claim 4, wherein the pressure value of cement paste discharged from the drill nozzle is 5-15 MPa.
6. The construction method of the bored and prefabricated composite pile according to claim 1, wherein the water cement ratio of the cement paste ranges from 0.6 to 0.8.
7. The construction method of the bored and prefabricated composite pile according to claim 1, wherein the blocking device is a blocking plate, and the blocking plate is connected to the end of the prefabricated pipe pile by a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011544522.XA CN112726583A (en) | 2020-12-24 | 2020-12-24 | Construction method for drilling prefabricated composite pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011544522.XA CN112726583A (en) | 2020-12-24 | 2020-12-24 | Construction method for drilling prefabricated composite pile |
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| Publication Number | Publication Date |
|---|---|
| CN112726583A true CN112726583A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011544522.XA Pending CN112726583A (en) | 2020-12-24 | 2020-12-24 | Construction method for drilling prefabricated composite pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123329A (en) * | 2021-05-13 | 2021-07-16 | 黄伟志 | Post-grouting process for implanted tubular pile |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648354A (en) * | 2005-02-05 | 2005-08-03 | 王常青 | Method for prefabricating composite pile by drilling hole |
| KR100773110B1 (en) * | 2006-05-04 | 2007-11-06 | (주)한맥기술 | Combination pile of phc pile and steel pipe attached concrete pile, constructing method therefor and temporary pile used therein |
| CN101148876A (en) * | 2007-11-05 | 2008-03-26 | 山东省机械施工有限公司 | Large load composite pile and construction method thereof |
| CN101858079A (en) * | 2010-06-02 | 2010-10-13 | 山东省建筑科学研究院 | Core filling tubular pile cement composite foundation pile and construction method |
| CN111809611A (en) * | 2020-08-24 | 2020-10-23 | 黑龙江辰午建筑工程有限公司 | Construction method of jet grouting prefabricated composite pile |
-
2020
- 2020-12-24 CN CN202011544522.XA patent/CN112726583A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648354A (en) * | 2005-02-05 | 2005-08-03 | 王常青 | Method for prefabricating composite pile by drilling hole |
| KR100773110B1 (en) * | 2006-05-04 | 2007-11-06 | (주)한맥기술 | Combination pile of phc pile and steel pipe attached concrete pile, constructing method therefor and temporary pile used therein |
| CN101148876A (en) * | 2007-11-05 | 2008-03-26 | 山东省机械施工有限公司 | Large load composite pile and construction method thereof |
| CN101858079A (en) * | 2010-06-02 | 2010-10-13 | 山东省建筑科学研究院 | Core filling tubular pile cement composite foundation pile and construction method |
| CN111809611A (en) * | 2020-08-24 | 2020-10-23 | 黑龙江辰午建筑工程有限公司 | Construction method of jet grouting prefabricated composite pile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123329A (en) * | 2021-05-13 | 2021-07-16 | 黄伟志 | Post-grouting process for implanted tubular pile |
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Application publication date: 20210430 |
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