CN113463626A - Anti-pulling combined pile with built-in prestressed pile core - Google Patents
Anti-pulling combined pile with built-in prestressed pile core Download PDFInfo
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- CN113463626A CN113463626A CN202110549463.3A CN202110549463A CN113463626A CN 113463626 A CN113463626 A CN 113463626A CN 202110549463 A CN202110549463 A CN 202110549463A CN 113463626 A CN113463626 A CN 113463626A
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- pile
- prestressed
- pile core
- core
- uplift
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- 239000011513 prestressed concrete Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 238000004873 anchoring Methods 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 210000002435 tendon Anatomy 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 238000007569 slipcasting Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- E02D5/58—Prestressed concrete piles
-
- 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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- 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 discloses a pulling-resistant composite pile with a built-in prestressed pile core, which comprises a prestressed concrete pile core and an anchoring slurry, wherein the prestressed concrete pile core is positioned on the inner side, the anchoring slurry is positioned on the outer side, the prestressed concrete pile core is prefabricated by a pretensioning method, and prestressed tendons and stirrups are arranged inside the prestressed concrete pile core; the anchoring slurry wraps the prestressed concrete pile core, and the anchoring slurry is formed after the prestressed concrete pile core is placed in the pile hole and is solidified and contracted through primary grouting and then is solidified through secondary grouting. The invention innovatively combines the advantages of the existing pretensioning method prestress process and the cast-in-place pile, the uplift pile obtained by the method has good durability and economy, high bearing capacity and good bonding performance between the pile body and the hole wall, and the construction process saves energy and reduces materials, thereby greatly reducing the construction cost.
Description
Technical Field
The invention relates to the field of construction of cast-in-place piles, in particular to a pulling-resistant combined pile with a built-in prestressed pile core and a construction method thereof.
Background
Along with the continuous development of city construction, underground projects are more and more, the development scale of underground space is gradually enlarged, and the anti-floating problem of the basement is more and more prominent.
At present, the uplift pile is widely applied to large basements. The uplift pile is generally a cast-in-situ bored pile or a prestressed pipe pile. The pile body reinforcement of the cast-in-situ bored pile needs to meet the crack calculation, and the economy is poor; the tubular pile is limited by a pore-forming process, is only suitable for a soft soil foundation, has hidden danger in the reliability of a pile body connecting joint, and has less and less application as an uplift pile in recent years.
The prestress technology can ensure that the uplift pile can meet the tensile strength of the section and effectively control the concrete pile body crack, thereby improving the durability of the pile foundation and reducing the construction cost; however, the prestressing process of underground engineering has great operation difficulty, long construction period, and no guarantee of quality, and is difficult to popularize and apply in large area.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an uplift composite pile with a built-in prestressed pile core and a construction method thereof, and the specific technical scheme is as follows:
a uplift composite pile with a built-in prestressed pile core comprises:
the prestressed concrete pile core is positioned on the inner side and is prefabricated by a pretensioning method, and prestressed tendons and stirrups are arranged inside the prestressed concrete pile core;
the anchor slurry that is located the outside, anchor slurry parcel prestressed concrete pile core, just the anchor slurry is through inciting somebody to action prestressed concrete pile core places behind the stake hole, and through the first slip casting solidification shrink back, carries out secondary slip casting again and solidifies the back and form.
Furthermore, in order to enhance the bonding performance between the pile core and the cast-in-place concrete, bamboo-shaped or point-shaped bulges are arranged on the peripheral surface of the prestressed concrete pile core.
Further, the anchoring slurry is a cement slurry.
Further, the diameter of the uplift composite pile is 250-400 mm, and the thickness of the anchoring slurry is 50-80 mm.
A construction method of a pulling-resistant combined pile with a built-in prestressed pile core comprises the following steps:
s1: prefabricating a prestressed concrete pile core in a factory by using a pre-tensioning method, wherein the diameter of the prestressed concrete pile core is smaller than that of the uplift pile;
s2: drilling holes by a drilling machine on a construction site;
s3: cleaning holes and removing slag, and putting down the pre-stressed concrete pile core obtained by prefabricating the S1, wherein the pre-stressed concrete pile core and the drilled hole are coaxial;
s4: and performing primary grouting around the prestressed concrete pile core, performing secondary grouting after the primary grouting is solidified and contracted to serve as anchoring slurry, reserving an anchor head extending into the bottom plate or the foundation, and completing uplift pile construction to obtain the prestressed uplift pile.
Compared with the existing common uplift pile type and construction process, the invention mainly has the following beneficial effects:
firstly, the reinforcing bars of the common reinforced concrete uplift pile are usually controlled by the crack resistance; compared with the requirement of the uplift resistance of the pile body, the calculation reinforcement required by the crack resistance usually has great margin, the utilization rate of the material performance is not high, and the economical efficiency is poor. In a corrosive site, even if a method of reinforcing bars is increased, the durability of the site cannot be completely ensured by sacrificing the economy to control cracks; under the long-term action of the underground water level fluctuation and the dry-wet alternative environment, the tiny cracks can be continuously enlarged, and some unknown potential safety hazards are generated. The pile type adopts a pre-tensioning method prestress process to prestress the pile body, can effectively control the generation of the pile body crack, also meets the requirement of not generating the pile body crack under the condition, improves the durability and the economical efficiency of the uplift pile, and saves energy and reduces materials. Meanwhile, the bonding performance between the pile body and the hole wall can be improved through secondary grouting.
Secondly, the prestressed uplift pile constructed on site has a complex site construction process, high requirements on construction quality and great influence on construction period; and the tension holes reserved in the bottom plate by the prestressed tendons can greatly improve the possibility of water leakage of the bottom plate, and cause hidden troubles in the aspects of durability and safety to the whole basement engineering. The pile is produced by adopting an industrialized pretensioning method prefabricating process, a prefabricated pile core is produced in a factory, is placed and installed at a construction site, anchoring slurry is poured, and the assembly concept and the method of the current superstructure are successfully applied to the field of cast-in-place piles.
Drawings
FIG. 1 is a process diagram of the construction process of the present invention, wherein (a) is a precast concrete pile core, (b) is a drill to form a hole, (c) is a pile core to be lowered, and (d) is a secondary grouting pile;
fig. 2 is a schematic cross-sectional view of a prestressed uplift pile according to the present invention;
FIG. 3 is a schematic view of the AA cross-section of FIG. 2.
In the figure, 1 is a prestressed concrete pile core, 2 is a bottom plate or a foundation, 3 is anchoring slurry, 101 is a prestressed tendon, 102 is a stirrup, 103 is pile core concrete, and 104 is a secondary grouting pipe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
The existing pre-tensioning method prestressed pile-grouting material has low utilization rate, is easy to generate cracks in a corrosive environment and has poor durability; the existing prestressed uplift pile constructed on site has the defects of complex construction process and long construction period, and because the tensioning holes of the prestressed tendons are required to be reserved in the bottom plate, the possibility of water leakage of the bottom plate is greatly improved, and the durability and the safety of basement engineering can be greatly influenced. The invention combines the advantages of the two methods, and innovatively provides a pulling-resistant combined pile with a built-in prestressed pile core and a construction method thereof, as shown in fig. 1, the construction method comprises the following steps:
s1: the prestressed concrete pile core 1 is prefabricated in a factory by a pre-tensioning method, the diameter of the prestressed concrete pile core 1 is smaller than that of the uplift pile, so that a space is reserved for secondary grouting, and as one embodiment, the diameter of the prestressed concrete pile core 1 is controlled to be 200-300 mm. The specific forming process of the prestressed concrete pile core 1 comprises the following steps: firstly, tensioning the steel bars 101 on the pedestal, then pouring the concrete pile core, and releasing the tensioning end after the strength reaches a design value so as to enable the pile core to form pre-pressure. Meanwhile, for the subsequent secondary grouting, a secondary grouting pipe 104 may be pre-left in the prestressed concrete pile core 1 or bound outside the finished pile core. Thirdly, in order to enhance the bonding performance between the concrete pile core 1 and the cast-in-place concrete 3, bamboo-shaped or punctiform bulges are arranged on the outer peripheral surface of the prestressed concrete pile core 1.
S2: drilling holes by a drilling machine on a construction site;
s3: and (4) cleaning holes and removing slag, and lowering the prestressed concrete pile core 1 obtained by prefabricating the S1 to ensure that the pile core and the drilled hole are coaxial.
S4: and performing primary grouting around the prestressed concrete pile core, performing secondary grouting after the primary grouting is solidified and contracted to serve as anchoring slurry, reserving an anchor head extending into the bottom plate or the foundation, and completing uplift pile construction to obtain the prestressed uplift pile. Wherein the thickness of the secondary grouting is preferably 50-80 mm. The application scenes of secondary grouting and uplift piles are comprehensively considered, and the diameter of the uplift pile is preferably 250-400 mm. The method can also be used in larger diameter pile forms and in compression resistant applications.
Fig. 2 and 3 show a uplift composite pile formed by the construction process of the present invention, which consists of a prestressed concrete pile core 1 at the inner side and a cast-in-place anchoring grout 3 surrounding the prestressed concrete pile core 1 at the outer side. The prestressed concrete pile core 1 is also provided with prestressed tendons 101 and stirrups 102.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A kind of built-in prestressed pile core resists and pulls out the composite pile, characterized by that, this resists and pulls out the composite pile to include:
the prestressed concrete pile core is positioned on the inner side and is prefabricated by a pretensioning method, and prestressed tendons and stirrups are arranged inside the prestressed concrete pile core.
The anchor slurry that is located the outside, anchor slurry parcel prestressed concrete pile core, just the anchor slurry is through inciting somebody to action prestressed concrete pile core places behind the stake hole, and through the first slip casting solidification shrink back, carries out secondary slip casting again and solidifies the back and form.
2. The uplift composite pile with a built-in prestressed pile core as claimed in claim 1, wherein the prestressed concrete pile core is provided with bamboo-like or dot-like protrusions on its outer circumferential surface for enhancing the adhesion between the pile core and the cast-in-place concrete.
3. The uplift composite pile with a built-in prestressed pile core as recited in claim 1, wherein said anchoring slurry is cement slurry.
4. The uplift composite pile with the built-in prestressed pile core as claimed in claim 1, wherein the diameter of the uplift composite pile is 250 mm-400 mm, and the thickness of the anchoring slurry is 50-80 mm.
5. A construction method of a uplift composite pile with a built-in prestressed pile core is characterized by comprising the following steps:
s1: prefabricating a prestressed concrete pile core in a factory by using a pre-tensioning method, wherein the diameter of the prestressed concrete pile core is smaller than that of the uplift pile;
s2: drilling holes by a drilling machine on a construction site;
s3: cleaning holes and removing slag, and putting down the pre-stressed concrete pile core obtained by prefabricating the S1, wherein the pre-stressed concrete pile core and the drilled hole are coaxial;
s4: and performing primary grouting around the prestressed concrete pile core, performing secondary grouting after the primary grouting is solidified and contracted to serve as anchoring slurry, reserving an anchor head extending into the bottom plate or the foundation, and completing uplift pile construction to obtain the prestressed uplift pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549463.3A CN113463626A (en) | 2021-05-20 | 2021-05-20 | Anti-pulling combined pile with built-in prestressed pile core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549463.3A CN113463626A (en) | 2021-05-20 | 2021-05-20 | Anti-pulling combined pile with built-in prestressed pile core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113463626A true CN113463626A (en) | 2021-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110549463.3A Pending CN113463626A (en) | 2021-05-20 | 2021-05-20 | Anti-pulling combined pile with built-in prestressed pile core |
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| Country | Link |
|---|---|
| CN (1) | CN113463626A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525781A (en) * | 2021-12-28 | 2022-05-24 | 浙江省建筑设计研究院 | Prestressed rod core bag grouting combined anti-floating component and construction method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2313959Y (en) * | 1996-05-24 | 1999-04-14 | 邹宗煊 | Cement-soil hard cored composite pile for fountain |
| CN201730091U (en) * | 2010-08-05 | 2011-02-02 | 上海中技桩业股份有限公司 | Cast-in-situ pile |
| CN104131556A (en) * | 2014-07-22 | 2014-11-05 | 冠鲁建设股份有限公司 | Soft-and-hard interlayer alternation foundation drainage prestressed pipe pile and construction method |
| CN106337413A (en) * | 2016-09-07 | 2017-01-18 | 东南大学 | Water-draining stiff geo-textile bag cement-soil composite pile and construction method thereof |
| CN106703024A (en) * | 2017-01-18 | 2017-05-24 | 安徽省经工建设集团有限公司 | Construction technique for composite pile formed through broken stone consolidation by slurry |
| AU2016306883B2 (en) * | 2015-08-12 | 2019-09-12 | Hohai University | Heat transfer pipe embedded in a prefabricated pipe pile and embedding method |
-
2021
- 2021-05-20 CN CN202110549463.3A patent/CN113463626A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2313959Y (en) * | 1996-05-24 | 1999-04-14 | 邹宗煊 | Cement-soil hard cored composite pile for fountain |
| CN201730091U (en) * | 2010-08-05 | 2011-02-02 | 上海中技桩业股份有限公司 | Cast-in-situ pile |
| CN104131556A (en) * | 2014-07-22 | 2014-11-05 | 冠鲁建设股份有限公司 | Soft-and-hard interlayer alternation foundation drainage prestressed pipe pile and construction method |
| AU2016306883B2 (en) * | 2015-08-12 | 2019-09-12 | Hohai University | Heat transfer pipe embedded in a prefabricated pipe pile and embedding method |
| CN106337413A (en) * | 2016-09-07 | 2017-01-18 | 东南大学 | Water-draining stiff geo-textile bag cement-soil composite pile and construction method thereof |
| CN106703024A (en) * | 2017-01-18 | 2017-05-24 | 安徽省经工建设集团有限公司 | Construction technique for composite pile formed through broken stone consolidation by slurry |
Non-Patent Citations (1)
| Title |
|---|
| 李彰明等: "软土地基加固的理论、设计与施工", 31 July 2006, 中国电力出版社, pages: 520 - 521 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525781A (en) * | 2021-12-28 | 2022-05-24 | 浙江省建筑设计研究院 | Prestressed rod core bag grouting combined anti-floating component and construction method |
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