CN115354651A - Construction method for pile extension of rotary drilling cast-in-place pile - Google Patents
Construction method for pile extension of rotary drilling cast-in-place pile Download PDFInfo
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- CN115354651A CN115354651A CN202210165870.9A CN202210165870A CN115354651A CN 115354651 A CN115354651 A CN 115354651A CN 202210165870 A CN202210165870 A CN 202210165870A CN 115354651 A CN115354651 A CN 115354651A
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- 238000005553 drilling Methods 0.000 title claims abstract description 29
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 230000002787 reinforcement Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 239000002023 wood Substances 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 12
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 235000013339 cereals Nutrition 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000009430 construction management Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/013—Shuttering specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
-
- 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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
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- Engineering & Computer Science (AREA)
- General 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)
- Environmental & Geological Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A construction method for pile extension of a rotary drilling cast-in-place pile is suitable for building of a piled raft foundation, and is characterized by comprising the following steps: a. b, processing concrete broken pile ends, b, processing the reinforcement cage of the connected and broken pile, c, processing concrete on the base, and d, erecting a template at the reinforcement cage of the connected and broken pile. e. And (5) pouring concrete. Compared with the traditional method, the construction method for the pile extension of the rotary drilling bored concrete pile adopts the square wood template to replace a sinking steel pile casing, has the advantages of strong plasticity, large forming specific gravity, high bearing capacity and convenient construction, can improve the integral stability of the pile extension, solves the problems of quality defects caused by pile breakage, not influencing the basic safety and the like, can improve the working efficiency, is convenient for construction, avoids the cost waste of additional pile addition and re-drilling and pouring, has obvious economic effect and has good applicability and application effect.
Description
Technical Field
The invention relates to a pile splicing method after pile breaking in pile foundation engineering, in particular to a construction method for rotary drilling cast-in-place pile splicing.
Background
The rotary drilling bored concrete pile has strong adaptability to various soil layers compared with punched holes, high bearing capacity, high speed, high automation degree, high hole forming speed and flexible walking, is particularly suitable for complex geology with stratum inversion phenomenon, mutual invasion and mixing on a plane and mutual layering of two kinds of local rocks on a vertical surface, cuts into the soil layers by the dead weight of a drill rod and a drill bit when drilling and taking soil, and cuts off soil blocks and pushes the soil blocks into a bucket when the drill bucket rotates so as to complete the soil drilling and taking. When hard soil is encountered, the bucket teeth can not cut into the soil layer due to self gravity, and the drill rod can be pressurized by the pressurizing oil cylinder to forcibly cut the bucket teeth into the soil, so that the drilling and soil taking are completed. After the drill bucket is filled with soil, the drill rod and the drill bucket are quickly lifted to the ground by the crane, the bottom door is opened by pulling the switch on the drill bucket, and the soil in the drill bucket is automatically discharged under the action of self weight. The drill rod is lowered down to close the bucket door and then is rotated into the hole to excavate the next bucket. The rotary drilling rig is flexible and mobile in walking, and can quickly shift or construct the next pile position after the final hole.
Due to the influence of factors such as complex geological conditions, construction management and the like, the broken pile of the rotary drilling bored concrete pile occurs when the cast is poured, and the broken pile of the common bored concrete pile has the following modes: firstly, pile in situ is recovered, a new pile is poured in situ again after thorough cleaning is adopted, so that thorough treatment is achieved, the method is good in effect, large in difficulty, long in construction period and high in cost, and can be selected according to factors such as the importance of engineering, geological conditions, the number of defects and the like; secondly, expanding a bearing platform method (shoulder pole type) pile splicing, additionally driving two piles on two sides of the broken pile respectively, and connecting the piles by adopting a bearing platform on the pile top, wherein the scheme can change the structural form of the pile foundation and increase a large amount of cost; and thirdly, the pile is connected by pouring the steel casing, the steel casing with the diameter larger than that of the broken pile is sunk, the steel casing is pressed below the position of the broken pile at the position of the broken pile, the concrete of the original broken pile is manually dug out, and the concrete is poured again, so that the method has poor safety and high casing cost.
Therefore, the known pile splicing method after pile breaking in pile foundation engineering has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a construction method for pile extension of a rotary drilling cast-in-place pile, which ensures the quality and improves the efficiency.
In order to achieve the purpose, the technical solution of the invention is as follows:
a construction method for pile splicing of rotary drilling cast-in-place piles is suitable for building of a piled raft foundation and is characterized by comprising the following steps:
a. concrete broken pile end treatment
Excavating to the elevation of the broken pile and the pile extension, breaking concrete at the end of the broken pile, chiseling the joint of the pile extension to expose reinforcing steel bars at the end of the broken pile, washing the reinforcing steel bars clean by a high-pressure water gun, and cleaning accumulated water and stone powder on the surface by cotton yarn;
b. the method comprises the following steps of:
(1) Setting a spiral stirrup @100 of a reinforcement cage, wherein the diameter and the specification are designed as same as those of the original design;
(2) A fixed hoop @2000 of the reinforcement cage is arranged, and the diameter and the specification are designed in the same way;
(3) Arranging additional lap joint longitudinal steel bars of the steel bar cage, wherein the diameter and the specification are designed as same as the original design;
(4) Arranging additional angle bars of a reinforcement cage, wherein the diameter and specification of the additional angle bars are the same as those of pile foundation longitudinal bars designed originally, the additional angle bars are square bars with externally tangent pile diameter, and the additional angle bars are positioned at four corners of the square bars with externally tangent pile diameter;
c. template for erecting reinforcement cage part of spliced and broken pile
After the reinforcement cage lengthening and the newly-added angle ribs are accepted, erecting a template at the reinforcement cage part of the lengthened and broken pile, wherein the erecting height of the template is more than or equal to 0.5m, and the cross section of the template is square;
d. pouring concrete
The pile-connecting concrete adopts underwater micro-expansion concrete, and the strength grade of the pile-connecting concrete is one grade higher than that of the original cast-in-place pile concrete.
The construction method of the rotary drilling bored concrete pile extension can be further realized by adopting the following technical measures.
In the method, the length of the exposed broken pile end steel bar is more than or equal to 1.4 times of the anchoring length.
In the method, the overlapping length of the overlapped longitudinal steel bar and the longitudinal steel bar exposing the end of the broken pile is increased to be more than or equal to 1.4 times of the anchoring length.
The method, wherein the size of the square cross section built by the template is +100mm.
After the technical scheme is adopted, the construction method of the rotary drilling bored concrete pile extension has the advantages that: compared with the traditional method, the method has the advantages that the square wood formwork is adopted to replace a sinking steel pile casing, the plasticity is strong, the forming specific gravity is high, the bearing capacity is high, the construction is convenient, the overall stability of the pile extension can be improved, the problems that the quality defect caused by pile breakage does not affect the basic safety and the like are solved, the working efficiency can be improved, the construction is convenient, the cost waste of additionally adding piles and re-drilling and pouring is avoided, the economic effect is obvious, and the method has good applicability and application effect.
Drawings
FIG. 1 is a schematic structural diagram of a pile splicing structure of a rotary drilling cast-in-place pile according to an embodiment of the invention;
fig. 2 is a schematic cross-sectional view of a pile extension of a rotary drilling cast-in-place pile according to an embodiment of the invention.
In the figure: 1 bottom plate, 2 new pile bolck, 3 increase overlap joint reinforcing bars, 4 spiral stirrup, 5 the reinforcing bar of former design bored concrete pile, 6 construction joints, 7 the pile bolck of former design bored concrete pile, 8 the concrete of former design bored concrete pile, 9 the concrete of new bored concrete pile, 10 stake footpath circumscribed square reinforcing bar, 11 angle muscle, 12 retaining ring muscle.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
The construction method of the pile extension of the rotary drilling cast-in-place pile comprises the following steps:
referring to fig. 1, fig. 1 is a schematic view of a pile splicing structure of a rotary drilling cast-in-place pile according to an embodiment of the present invention.
1. Pile head breaking concrete: and (3) digging a new pile top 2 below the bottom plate 1 manually to reach pile extension elevation, then breaking pile head concrete, requiring no slag on the surface of the concrete and no loose concrete, chiseling joints of the pile, and cleaning up the concrete on the surface of the exposed steel bars.
2. Lengthening a steel reinforcement cage and newly adding an overlap joint steel bar 3: newly-increased steel reinforcement cage of reinforcement processing is joined in marriage according to 5 cages designs of former bored concrete pile reinforcing bar, and the overlap joint position is equipped with construction joint 6, and concrete steel reinforcement cage and newly-increased reinforcing bar require as follows:
(1) The spiral stirrup 4 is @100, and the diameter and the specification are designed as same as the original ones.
(2) Fixed hoop 12 (stiffening hoop) @2000, diameter and specification are the same as the original design.
(3) The diameter and specification of the newly added lap joint longitudinal steel bar are the same as the original design, the lap joint length of the lap joint steel bar 3 and the original pile longitudinal steel bar is increased to be 1.4 times of the anchoring length, single-side lap joint welding is adopted at the upper end and the lower end of the lap joint part, and the length of a welding seam is 10d. The height of the concrete 9 of the newly cast-in-place pile is between the pile top 7 of the originally designed cast-in-place pile and the new pile top 2.
(4) The newly-added angle bars 11 are positioned at four corners of a pile diameter circumcircle, the diameter and the specification of the newly-added angle bars are the same as those of the pile foundation longitudinal bars designed in the prior art, a chemical bar planting mode is adopted, and the bar planting depth is not less than 15 times of the bar diameter.
3. Treating the base concrete: cleaning concrete adhered to the surface of the steel bar, cleaning small blocks of concrete and sand grains on the surface of the concrete, washing the small blocks of concrete and the sand grains by using a high-pressure water gun, and cleaning accumulated water and mountain flour on the surface by using cotton yarn.
4. Sealing the film by using a square template: after the steel reinforcement cage is lengthened and the newly-added angle steel is accepted, a 15-thick glued wood template is adopted for sealing the membrane, a 48 multiplied by 3.0mm double steel pipe @400 is adopted for reinforcement, and the square dimension is (pile diameter +100 mm) × (pile diameter +100 mm). Fig. 2 is a schematic cross-sectional view of a pile extension of a rotary drilling cast-in-place pile according to an embodiment of the invention. The pile diameter externally tangent square steel bar 10 is externally tangent with the pile diameter.
5. Pouring concrete: the pile splicing concrete adopts underwater micro-expansion concrete, the strength grade of the concrete 9 of the newly cast-in-place pile is higher than that of the original cast-in-place pile, the cast-in-place piles are cast in layers, each layer is 300mm, and the cast-in-place piles are vibrated by using inserted vibrators.
The construction method of the rotary drilling cast-in-place pile splicing pile is suitable for building of a piled raft foundation and facilitates the bar planting and rooting of newly-added angle bars. The pile extension length is more than or equal to 0.5m to meet the lap joint length of the newly added longitudinal bars. Newly-added longitudinal bars need to be full, firm and free of slag inclusion in lap welding, and main bars are strictly prevented from being burnt in welding; the new angle bar planting depth needs to be satisfied, and the pore-forming has no ash, and the bar planting quality is guaranteed. And drawing test is required for a specified time after the newly added angle bar planting is finished. According to the construction method for pile extension of the rotary drilling cast-in-place pile, the square wood template is adopted to replace a sinking steel pile casing, construction is convenient, the integral stability of the pile extension is improved, the problems that quality defects caused by pile breakage do not affect foundation safety and the like are solved, work efficiency can be improved, and construction is convenient.
The construction method for pile extension of the rotary drilling cast-in-place pile is applied in the actual engineering project, is easy to operate, ensures the quality, has obvious effect, is accepted by supervision units and construction units, is popular with operators, and obtains good economic benefit and social influence.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (4)
1. A construction method for pile extension of a rotary drilling cast-in-place pile is suitable for building of a piled raft foundation, and is characterized by comprising the following steps:
a. concrete broken pile end treatment
Excavating to the elevation of the broken pile and the pile extension, breaking concrete at the end of the broken pile, chiseling the joint of the pile extension to expose reinforcing steel bars at the end of the broken pile, washing the reinforcing steel bars clean by a high-pressure water gun, and cleaning accumulated water and stone powder on the surface by cotton yarn;
b. the method comprises the following steps of:
(1) Setting a spiral stirrup @100 of a reinforcement cage, wherein the diameter and the specification are designed as same as those of the original design;
(2) The fixed hoop @2000 of the steel reinforcement cage is arranged, and the diameter and the specification are designed in the same way;
(3) Arranging additional lap joint longitudinal steel bars of the steel bar cage, wherein the diameter and the specification are designed as same as the original design;
(4) Arranging additional angle bars of a reinforcement cage, wherein the diameter and specification of the additional angle bars are the same as those of pile foundation longitudinal bars designed originally, the additional angle bars are square bars with externally tangent pile diameter, and the additional angle bars are positioned at four corners of the square bars with externally tangent pile diameter;
c. template for erecting reinforcement cage position of connected and broken pile
After the steel reinforcement cage lengthening and the newly-added angle rib are accepted, erecting a template at the position of the steel reinforcement cage of the lengthened and broken pile, wherein the erecting height of the template is more than or equal to 0.5m, and the cross section of the template is square;
d. pouring concrete
The pile-connecting concrete adopts underwater micro-expansion concrete, and the strength grade of the pile-connecting concrete is one grade higher than that of the original cast-in-place pile concrete.
2. The construction method of the pile extension of the rotary drilling bored pile according to claim 1, wherein the length of the exposed broken pile end reinforcement is not less than 1.4 times of the anchoring length.
3. The construction method for pile extension of the rotary drilling cast-in-place pile according to claim 1, wherein the overlapping length of the overlapped longitudinal steel bars and the longitudinal steel bars exposing the end of the broken pile is increased to be more than or equal to 1.4 times of anchoring length.
4. The construction method of the pile extension of the rotary drilling cast-in-place pile according to claim 1, wherein the square size of the cross section of the template erection is +100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210165870.9A CN115354651A (en) | 2022-02-23 | 2022-02-23 | Construction method for pile extension of rotary drilling cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210165870.9A CN115354651A (en) | 2022-02-23 | 2022-02-23 | Construction method for pile extension of rotary drilling cast-in-place pile |
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| CN115354651A true CN115354651A (en) | 2022-11-18 |
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| CN202210165870.9A Pending CN115354651A (en) | 2022-02-23 | 2022-02-23 | Construction method for pile extension of rotary drilling cast-in-place pile |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150267373A1 (en) * | 2009-07-01 | 2015-09-24 | Nutech Ventures, Inc. | Continuously Prestressed Concrete Pile Splice |
| US9695568B2 (en) * | 2013-03-12 | 2017-07-04 | David L. Lewis | Permanent shallow frost protected footing foundation for a building and method for constructing a foundation including a permanent shallow frost protected footing |
| CN206538779U (en) * | 2017-02-23 | 2017-10-03 | 华西能源工程有限公司 | A kind of rotary digging bored concrete pile pile splicing structure |
| CN109518681A (en) * | 2018-11-22 | 2019-03-26 | 五冶集团上海有限公司 | Precast concrete square pile connector processing method |
| CN109706955A (en) * | 2018-12-28 | 2019-05-03 | 江苏兴厦建设工程集团有限公司 | One kind being suitable for III class stake of cast-in-situ bored pile and cushion cap connection type |
| CN209353327U (en) * | 2018-11-13 | 2019-09-06 | 中国建筑第八工程局有限公司 | The quick pile extension device of rotary digging stake in small space |
-
2022
- 2022-02-23 CN CN202210165870.9A patent/CN115354651A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150267373A1 (en) * | 2009-07-01 | 2015-09-24 | Nutech Ventures, Inc. | Continuously Prestressed Concrete Pile Splice |
| US9695568B2 (en) * | 2013-03-12 | 2017-07-04 | David L. Lewis | Permanent shallow frost protected footing foundation for a building and method for constructing a foundation including a permanent shallow frost protected footing |
| CN206538779U (en) * | 2017-02-23 | 2017-10-03 | 华西能源工程有限公司 | A kind of rotary digging bored concrete pile pile splicing structure |
| CN209353327U (en) * | 2018-11-13 | 2019-09-06 | 中国建筑第八工程局有限公司 | The quick pile extension device of rotary digging stake in small space |
| CN109518681A (en) * | 2018-11-22 | 2019-03-26 | 五冶集团上海有限公司 | Precast concrete square pile connector processing method |
| CN109706955A (en) * | 2018-12-28 | 2019-05-03 | 江苏兴厦建设工程集团有限公司 | One kind being suitable for III class stake of cast-in-situ bored pile and cushion cap connection type |
Non-Patent Citations (1)
| Title |
|---|
| 余刚;: "浅谈桥梁钻孔灌注桩断桩处理及预防措施", 广东建材, no. 05 * |
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Application publication date: 20221118 |