CN112482372A - Defect repairing method for cast-in-place pile - Google Patents
Defect repairing method for cast-in-place pile Download PDFInfo
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- CN112482372A CN112482372A CN202011397647.4A CN202011397647A CN112482372A CN 112482372 A CN112482372 A CN 112482372A CN 202011397647 A CN202011397647 A CN 202011397647A CN 112482372 A CN112482372 A CN 112482372A
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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
- E02D5/64—Repairing piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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Abstract
The invention provides a method for repairing defects of a cast-in-place pile, and relates to the field of pile foundation repair. The repairing method comprises the following steps: step one, determining the position and size of a pile body defect by adopting a sound wave transmission method; step two, continuously coring around the center of the cast-in-place pile by using a drill to form an annular separation groove, breaking the concrete core column and hoisting out, and constructing a central vertical shaft in the cast-in-place pile; step three, repeating the step two, and increasing the depth of the central vertical shaft until the bottom of the central vertical shaft reaches below the defect of the pile body; fourthly, the constructors go into the well to chisel out and clear up the defects of the pile body, and wash out the drilling slag and the concrete chips on the well wall; fifthly, draining accumulated water and sediments in the central vertical shaft, pouring concrete into the central vertical shaft and vibrating for compaction; and step six, after the concrete strength meets the requirement, carrying out recheck detection on the cast-in-place pile to ensure that the quality of the cast-in-place pile meets the standard. Constructors can go deep into the interior of the cast-in-place pile to carry out visual clearing operation, and the repairing effect is better.
Description
Technical Field
The invention relates to the technical field of pile foundation repair, in particular to a method for repairing defects of a cast-in-place pile.
Background
In the building engineering, the pile foundation is used as a key stressed structure of a building main body, and the quality and the safety of the whole engineering can be directly influenced if defects exist in the pile foundation. However, in a complex construction environment, defects generated in the pile foundation are difficult to completely avoid, so that how to effectively repair the internal defects of the pile foundation becomes a problem to be solved urgently.
For example, a Chinese patent with an authorization notice number of CN103541359B and an authorization notice date of 2015.06.17 discloses a method for remedying and treating quality defects of a cast-in-place pile, and specifically discloses that the method comprises the following steps: 1) measuring the defect position of the pile by low-strain dynamic measurement; 2) drilling holes on the pile top to core, wherein the core-taking depth exceeds the defect position; accurately determining the depth of the defect position and the defect degree according to the core sample extracted after drilling; 3) washing holes at high pressure, and removing fillers such as mud blocks, fine sand and the like in the defect position; 4) cleaning holes at high pressure, namely returning sediment in the core holes out of the core hole openings, so that no sediment is precipitated in the core holes until the water is used for removing the sediment; 5) punching and filling high-pressure cement slurry: filling fine cracks and fissures at the defect positions; 6) the inserting pipe is inserted into the grouting pipe and the grout discharging pipe; 7) sealing holes; 8) and (6) high-pressure grouting. And after the steps are finished, carrying out low-strain dynamic testing retesting on the defective pile to determine that the repair reaches the standard.
The quality defect remedying and processing method of the cast-in-place pile in the prior art adopts core drilling to the defect part, determines the defect position in the pile foundation according to a core sample, and then utilizes high-pressure water to wash and clean the hole. However, the above-mentioned hole cleaning operation is actually completed under blind condition, and whether to remove the defect is mainly judged by constructors according to the cleanliness of water after washing, so that not only a large amount of water sources are consumed, but also the purpose of thorough cleaning is difficult to achieve, and the expected effect on repairing the internal defect of the pile foundation is difficult to achieve.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a method for repairing a defect of a cast-in-place pile, so as to solve the problems that the conventional operations of flushing and cleaning holes are actually completed in a blind manner, and whether the defect is cleaned or not is mainly judged by a constructor according to the cleaning degree of water after flushing, a large amount of water sources are consumed, the method is difficult to achieve the purpose of thorough cleaning, and the expected effect on repairing the defect inside the pile foundation is difficult to achieve.
The technical scheme of the method for repairing the defects of the cast-in-place pile comprises the following steps:
the defect repairing method of the cast-in-place pile comprises the following steps:
step one, determining the position and size of a pile body defect by adopting a sound wave transmission method;
step two, continuously coring around the center of the cast-in-place pile by using a drill to form an annular separation groove, breaking the concrete core column and hoisting out, and constructing a central vertical shaft in the cast-in-place pile;
step three, repeating the step two, and increasing the depth of the central vertical shaft until the bottom of the central vertical shaft reaches below the defect of the pile body;
fourthly, the constructors go into the well to chisel and clear the defects of the pile body, and wash and remove the drilling slag and the concrete chips on the well wall;
fifthly, draining accumulated water and sediments in the central vertical shaft, pouring concrete into the central vertical shaft, and vibrating and compacting;
and step six, after the concrete strength meets the requirement, carrying out recheck detection on the cast-in-place pile to ensure that the quality of the cast-in-place pile meets the standard.
Further, before the second step, determining whether a protective steel casing needs to be additionally arranged according to the depth of the pile body defect and the geological condition around the defect;
if the pile body defect exceeds the original pile casing of the cast-in-place pile and is in an unstable soil layer with poor geological conditions or a stratum with confined water, additionally arranging the protective steel pile casing outside the cast-in-place pile; otherwise, the protective steel casing does not need to be additionally arranged.
Further, the diameter that a protection steel protects a section of thick bamboo is greater than the diameter that a bored concrete pile originally protected a section of thick bamboo, just protection steel protects a section of thick bamboo cover and establishes the outside that a bored concrete pile originally protected a section of thick bamboo.
Furthermore, the diameter of the protective steel casing is 0.3m to 0.5m larger than that of the original casing of the cast-in-place pile by any size.
Further, in the second step, a water drill with a drill diameter of 80mm to 100mm is used for continuous coring, an annular separation groove with the diameter of 1m and the depth of 0.8m is formed, and a concrete core column with the height of 0.8m is obtained at the central position of the cast-in-place pile.
Furthermore, in the second step, a triangular wedge block is inserted into the annular separation groove to press and break the concrete core column, and then the broken concrete core column is hoisted out of the well to form the central vertical shaft.
Further, in the third step, the core is continuously taken at the bottom of the central vertical shaft by using the water drill, and then the operations of breaking the concrete core column and lifting the concrete core column are repeated until the bottom of the central vertical shaft reaches below 1m of the defect position of the pile body.
Further, in step five, the grade of the concrete is 1 strength grade higher than the design grade of the cast-in-place pile.
Further, in the fifth step, before the concrete is poured, three sounding pipes are uniformly arranged in the central vertical shaft along the well wall, and the lower ends of the three sounding pipes extend to the bottom of the central vertical shaft respectively.
Further, in the sixth step, ultrasonic detection is respectively performed by combining the original sounding pipe and the newly added sounding pipe of the cast-in-place pile, and the repair quality of the cast-in-place pile is judged according to the detection result.
Has the advantages that: the method for repairing the defects of the cast-in-place pile can construct and form a central vertical shaft in the cast-in-place pile, the central vertical shaft is used as a repairing channel, workers can directly go deep into the cast-in-place pile to visually clear the defects of the pile body, accumulated water, drilling slag, concrete scraps and the like are discharged out of the central vertical shaft after the defects of the pile body are cleared, then concrete is poured into the central vertical shaft to fill the defects of the pile body and the space part of the central vertical shaft, and rechecking and detecting are carried out after the concrete is solidified, so that the repairing effect and the quality of the whole cast-in-place pile are ensured. Compared with the prior art, the repairing method has the advantages that the defect is removed by flushing under the blind condition, a large amount of water sources are prevented from being consumed, the purpose of thoroughly cleaning the defect can be achieved by the constructor penetrating into the cast-in-place pile, and the repairing effect on the defect in the pile foundation is better.
Drawings
Fig. 1 is a schematic view of construction in constructing a central shaft in embodiment 1 of the method for repairing a defect of a cast-in-place pile according to the present invention;
fig. 2 is a schematic top view of the construction of the central shaft of fig. 1;
fig. 3 is a construction diagram illustrating a constructor sinking a shaft to remove a defect in a cast-in-place pile in embodiment 1 of the method for repairing a defect in a cast-in-place pile according to the present invention.
In the figure: 1-filling pile, 10-pile body defect, 11-annular separation groove, 12-concrete core column, 13-central vertical shaft, 14-reinforcement cage, 2-original filling pile casing, 3-protective steel casing and 4-triangular wedge block.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the method for repairing a defect of a cast-in-place pile according to embodiment 1 of the present invention is a method for repairing a cast-in-place pile having a defect in a pile body, and includes the following steps:
step one, determining the position and the size of a pile body defect 10 by adopting a sound wave transmission method; it should be noted that, the cast-in-place pile 1 includes a reinforcement cage 14 and a concrete part, three or four sounding pipes are fixedly connected to the inner side of the reinforcement cage 14, the three or four sounding pipes are arranged in an extending manner along the axis direction of the cast-in-place pile 1 and are uniformly distributed around the central axis of the cast-in-place pile 1 at circumferential intervals, the sounding pipes are the primary sounding pipes in the following description, and the primary sounding pipes and the reinforcement cage 14 are respectively cast inside the concrete part. Inserting an ultrasonic detection probe into the acoustic pipe, transmitting acoustic pulses through the acoustic pipe and the concrete part by using the ultrasonic detection probe, and determining the position and size of the pile body defect 10 according to the change of acoustic signals.
Step two, continuously coring around the center of the cast-in-place pile 1 by using a drill to form an annular separation groove 11, breaking off the concrete core column 12 and hoisting out, and constructing a central vertical shaft 13 in the cast-in-place pile 1; in the second step, a water drill with a drill diameter of 80mm to 100mm is used for continuous coring, an annular separation groove 11 with the diameter of 1m and the depth of 0.8m is formed, and a concrete core column 12 with the height of 0.8m is obtained at the central position of the cast-in-place pile 1. Specifically, in the second step, the triangular wedge blocks 4 are inserted into the annular separation grooves 11 to press and break the concrete core column 12, and then the broken concrete core column 12 is lifted out of the well to form the central vertical shaft 13.
In order to improve the safety of repair construction, before the second step, whether the protective steel casing 3 needs to be additionally arranged or not is determined according to the depth of the pile body defect 10 and the geological condition around the defect.
If the pile body defect 10 exceeds the original pile casing 2 of the cast-in-place pile and the pile body defect 10 is in an unstable soil layer with poor geological conditions or a stratum with confined water, the protective steel pile casing 3 is additionally arranged outside the cast-in-place pile 1. Moreover, the diameter of the protective steel casing 3 is larger than that of the original cast-in-place pile casing 2, and the protective steel casing 3 is sleeved outside the original cast-in-place pile casing 2. Specifically, the diameter of the protective steel casing 3 is larger than the diameter of the original cast-in-place pile casing 2 by any size between 0.3m and 0.5 m.
Otherwise, the protective steel casing 3 does not need to be additionally arranged. For example: when the pile body defect 10 is in the depth range of the original pile casing 2 of the cast-in-place pile, or the pile body defect 10 exceeds the depth range of the original pile casing 2 of the cast-in-place pile but a stable soil layer or rock stratum with better geological conditions is arranged around the pile body defect 10, the aim of safe repair construction can be achieved without additionally arranging the protective steel casing 3.
Step three, repeating the step two, and increasing the depth of the central vertical shaft 13 until the bottom of the central vertical shaft 13 reaches below the pile body defect 10; and in the third step, continuously coring at the bottom of the central shaft 13 by using the water drill, and then repeating the operations of breaking the concrete core column 12 and lifting out the concrete core column 12 until the bottom of the central shaft 13 reaches below 1m of the position of the pile body defect 10, so as to ensure that the pile body defect 10 can be completely exposed in the central shaft 13, and facilitate a constructor to thoroughly remove the part of the pile body defect 10.
And fourthly, the constructors go into the well to chisel and clean the defects 10 of the pile body, and wash and remove the drilling slag and the concrete chips on the well wall.
Fifthly, draining accumulated water and sediments in the central vertical shaft 13, pouring concrete into the central vertical shaft 13 and vibrating for compaction; it should be noted that, in step five, the grade of the concrete is 1 strength grade higher than the design grade of the cast-in-place pile 1. And in the fifth step, before the concrete is poured, three sounding pipes are uniformly arranged in the central vertical shaft 13 along the well wall, the lower ends of the three sounding pipes respectively extend to the bottom of the central vertical shaft 13, and the sounding pipes are the newly-added sounding pipes.
And step six, after the concrete strength meets the requirement, rechecking and detecting the cast-in-place pile 1 to ensure that the quality of the cast-in-place pile 1 meets the standard. Specifically, ultrasonic detection is respectively performed by combining an original sounding pipe and a newly added sounding pipe of the cast-in-place pile, and the repair quality of the cast-in-place pile 1 is judged according to the detection result.
The defect repairing method of the cast-in-place pile can construct and form a central vertical shaft 13 in the cast-in-place pile 1, the central vertical shaft 13 is used as a repairing channel, workers can directly go deep into the cast-in-place pile 1 to visually clear the defect 10 of the pile body, accumulated water, drilling slag, concrete scraps and the like are discharged out of the central vertical shaft 13 after the defect 10 of the pile body is cleared, then concrete is poured into the central vertical shaft 13 to fill the space part of the defect 10 of the pile body and the central vertical shaft 13, rechecking detection is carried out after the concrete is solidified, and the repairing effect and the quality of the whole cast-in-place pile are ensured. Compared with the prior art, the repairing method has the advantages that the defect is removed by flushing under the blind condition, a large amount of water sources are prevented from being consumed, the purpose of thoroughly cleaning the defect can be achieved by the constructor penetrating into the cast-in-place pile 1, and the repairing effect on the defect in the pile foundation is better.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A defect repairing method of a cast-in-place pile is characterized by comprising the following steps:
step one, determining the position and size of a pile body defect by adopting a sound wave transmission method;
step two, continuously coring around the center of the cast-in-place pile by using a drill to form an annular separation groove, breaking the concrete core column and hoisting out, and constructing a central vertical shaft in the cast-in-place pile;
step three, repeating the step two, and increasing the depth of the central vertical shaft until the bottom of the central vertical shaft reaches below the defect of the pile body;
fourthly, the constructors go into the well to chisel and clear the defects of the pile body, and wash and remove the drilling slag and the concrete chips on the well wall;
fifthly, draining accumulated water and sediments in the central vertical shaft, pouring concrete into the central vertical shaft, and vibrating and compacting;
and step six, after the concrete strength meets the requirement, carrying out recheck detection on the cast-in-place pile to ensure that the quality of the cast-in-place pile meets the standard.
2. The method for repairing the defect of the cast-in-place pile according to claim 1, wherein before the step two, whether a protective steel casing needs to be added or not is determined according to the depth of the defect of the pile body and the geological condition around the defect;
if the pile body defect exceeds the original pile casing of the cast-in-place pile and is in an unstable soil layer with poor geological conditions or a stratum with confined water, additionally arranging the protective steel pile casing outside the cast-in-place pile; otherwise, the protective steel casing does not need to be additionally arranged.
3. The method for repairing the defect of the cast-in-place pile according to claim 2, wherein the diameter of the protective steel casing is larger than that of the original cast-in-place pile casing, and the protective steel casing is sleeved outside the original cast-in-place pile casing.
4. A method for repairing defects of a cast-in-place pile according to claim 3, wherein the diameter of the protective steel casing is any size between 0.3m and 0.5m larger than the diameter of the original cast-in-place pile casing.
5. A method for repairing defects of a cast-in-place pile as claimed in claim 1, wherein in the second step, core-taking is continuously performed using a water drill having a drill diameter of 80mm to 100mm to form a circular partition groove having a diameter of 1m and a depth of 0.8m, and a concrete core column having a height of 0.8m is obtained at a central position of the cast-in-place pile.
6. A method for repairing defects of a cast-in-place pile according to claim 1, wherein in the second step, the concrete core column is jacked and broken by inserting a triangular wedge block into the annular separation groove, and then the broken concrete core column is hoisted out of the well to form the central vertical shaft.
7. A method for repairing defects of a cast-in-place pile according to claim 1, wherein in step three, core taking is continuously carried out at the bottom of the central shaft by using the water drill, and then the operations of breaking the concrete core column and lifting out the concrete core column are repeated until the bottom of the central shaft reaches less than 1m of the defect position of the pile body.
8. The method for repairing a defect of a cast-in-place pile according to claim 1, wherein in the fifth step, the grade of the concrete is higher than the design grade of the cast-in-place pile by 1 strength grade.
9. A method for repairing defects in a cast-in-place pile according to claim 1, wherein in step five, before the concrete is cast in, three sounding pipes are uniformly arranged in the central vertical shaft along the wall of the shaft, and the lower ends of the three sounding pipes respectively extend to the bottom of the central vertical shaft.
10. The method for repairing defects of a cast-in-place pile according to claim 9, wherein in the sixth step, ultrasonic testing is performed by combining the original sounding pipe and the newly added sounding pipe of the cast-in-place pile, respectively, and the repairing quality of the cast-in-place pile is judged according to the testing result.
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| CN202011397647.4A CN112482372A (en) | 2020-12-02 | 2020-12-02 | Defect repairing method for cast-in-place pile |
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| CN202011397647.4A CN112482372A (en) | 2020-12-02 | 2020-12-02 | Defect repairing method for cast-in-place pile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277790A (en) * | 2021-12-16 | 2022-04-05 | 深圳市工勘岩土集团有限公司 | Defect bored concrete pile maintenance processing method |
| CN114277798A (en) * | 2021-12-16 | 2022-04-05 | 深圳市工勘岩土集团有限公司 | Method for binding new reinforcement cage in hole of defected cast-in-place pile |
| CN114541378A (en) * | 2022-01-12 | 2022-05-27 | 中国建筑第八工程局有限公司 | Drilling tool device for repairing pile foundation defects and pile foundation defect repairing method |
| CN114622553A (en) * | 2022-03-22 | 2022-06-14 | 陈倩 | Defect bored concrete pile maintenance processing method |
| CN115233756A (en) * | 2022-08-25 | 2022-10-25 | 中国建筑第八工程局有限公司 | Cast-in-place pile defect treatment construction method |
| CN115305909A (en) * | 2022-09-06 | 2022-11-08 | 杭州联力地空建筑科技有限公司 | Stirring drilling rod for reinforcing defective pile in soft foundation construction |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277790A (en) * | 2021-12-16 | 2022-04-05 | 深圳市工勘岩土集团有限公司 | Defect bored concrete pile maintenance processing method |
| CN114277798A (en) * | 2021-12-16 | 2022-04-05 | 深圳市工勘岩土集团有限公司 | Method for binding new reinforcement cage in hole of defected cast-in-place pile |
| CN114277798B (en) * | 2021-12-16 | 2023-05-23 | 深圳市工勘岩土集团有限公司 | Binding method for new reinforcement cage of defect filling pile middle hole |
| CN114277790B (en) * | 2021-12-16 | 2023-08-25 | 深圳市工勘岩土集团有限公司 | Repairing and processing method for defect filling pile |
| CN114541378A (en) * | 2022-01-12 | 2022-05-27 | 中国建筑第八工程局有限公司 | Drilling tool device for repairing pile foundation defects and pile foundation defect repairing method |
| CN114541378B (en) * | 2022-01-12 | 2023-10-13 | 中国建筑第八工程局有限公司 | Drilling tool device for repairing pile foundation defect and pile foundation defect repairing method |
| CN114622553A (en) * | 2022-03-22 | 2022-06-14 | 陈倩 | Defect bored concrete pile maintenance processing method |
| CN115233756A (en) * | 2022-08-25 | 2022-10-25 | 中国建筑第八工程局有限公司 | Cast-in-place pile defect treatment construction method |
| CN115305909A (en) * | 2022-09-06 | 2022-11-08 | 杭州联力地空建筑科技有限公司 | Stirring drilling rod for reinforcing defective pile in soft foundation construction |
| CN115305909B (en) * | 2022-09-06 | 2023-10-27 | 杭州联力地空建筑科技有限公司 | Stirring drill rod for reinforcing defective piles in soft foundation construction |
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Application publication date: 20210312 |