CN112726590A - Method for processing quality defects of cast-in-situ bored pile - Google Patents
Method for processing quality defects of cast-in-situ bored pile Download PDFInfo
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- CN112726590A CN112726590A CN202011619520.2A CN202011619520A CN112726590A CN 112726590 A CN112726590 A CN 112726590A CN 202011619520 A CN202011619520 A CN 202011619520A CN 112726590 A CN112726590 A CN 112726590A
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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
- E02D33/00—Testing foundations or foundation structures
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
Abstract
The invention discloses a method for processing quality defects of cast-in-situ bored piles, which comprises the following steps: step S1, detecting the integrity of the pile body; step S2, drilling, core pulling and sampling; step S3, determining the setting of the processing hole, and drilling the processing hole; step S4, consolidation treatment is carried out on soil outside the pile at the defective part of the defective I-shaped pile; step S5, performing high-pressure rotary jet cutting and clearing treatment on the defective part until all the treatment holes are communicated; step S6, carrying out gas lift slag removal treatment on each treatment hole; step S7, high-pressure cement slurry is injected; step S8, installing an orifice pipe; step S9, secondary high-pressure cement slurry injection; the invention adopts the high-pressure jet cutting grouting treatment process to remove mud inclusion and segregation loose concrete at the defect part, then combines with gas lift to remove sediment sundries, then carries out high-pressure grouting, and finally carries out secondary high-pressure grouting, and the strength and the bearing capacity of the defect pile foundation treated by the process are greatly improved, and the invention also has the advantages of short construction period and low cost.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for processing quality defects of cast-in-situ bored piles.
Background
Cast-in-situ bored piles are one of the main foundation forms of bridge engineering nowadays, and in actual construction and production, various defects of a pile body are often caused by site hydrogeology problems and problems of construction organization, equipment, materials and process technology control. Such as: pile breaking, mud clamping, reducing, concrete segregation and the like. When the above problems occur, the pile body integrity is judged to be the type III pile or below in the pile body integrity detection. That is, the pile body has obvious or serious defects, which affect the bearing capacity of the pile body structure and can not meet the requirements of the structure function and quality.
For this purpose, the pile is generally treated by: 1. the original pile is impacted, crushed, the hole is formed again, the reinforcement cage is arranged, concrete is poured again, namely, the defective pile is removed, and the pile is made again; 2. pile repairing, namely repairing two piles at two sides of the original pile position, then arranging a cross beam, and manufacturing an upright column above the original pile position on the cross beam; 3. and excavating to the defect position for treatment after certain safety measures are taken for the shallow defect depth.
In recent years, a process for treating the defects of the pile body by high-pressure grouting in the pile appears, and related articles are occasionally published in related magazines. However, most of the treatment effects are not good, and the integrity level of the pile body cannot be improved generally. The key points are that the defect part cannot be effectively cleaned, and the parameters of construction and materials cannot be well mastered.
The high-pressure jet cutting mud jacking treatment process adopted by the invention is a novel cast-in-situ bored pile treatment process, and practice proves that the high-pressure jet cutting mud jacking treatment process has the characteristics of obvious effect, short construction period and low cost, and is one of effective methods for improving the integrity of a pile body.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the invention is to provide a method for processing the quality defect of a bored pile, the method adopts a high-pressure jet cutting grouting processing technology to remove mud inclusion and segregation loose concrete at the defect part, and then the method is combined with air lift to remove sediment impurities, compared with the prior art that grouting is directly performed or grouting is performed after the defect is removed, the method has better processing effect, and can greatly improve the bearing capacity of the defective pile foundation.
The invention provides a method for processing quality defects of a cast-in-situ bored pile, which comprises the following steps:
step S1, detecting the integrity of the cast-in-situ bored pile body;
step S2, drilling, core-pulling and sampling the bored pile body;
step S3, determining the type, position, area and thickness of the defect according to the step S1 and the step S2, further determining the hole position, number and depth of the processing hole according to the type, position, area and thickness of the defect, and drilling the processing hole;
step S4, judging whether the cast-in-situ bored pile belongs to a defective I-shaped pile or not according to the type, position, area and thickness of the defect, and if the cast-in-situ bored pile belongs to the defective I-shaped pile, performing consolidation treatment on a soil body outside the cast-in-situ bored pile;
step S5, performing high-pressure rotary jet cutting and clearing treatment on the defective part until all the treatment holes are communicated;
step S6, carrying out gas lift slag removal treatment on each processing hole until each processing hole is cleaned;
step S7, performing high-pressure cement slurry pressure injection treatment on the treatment holes;
step S8, arranging an orifice pipe at the orifice position of each processing hole, selecting one processing hole as a grouting hole from the plurality of processing holes, and taking the rest processing holes as slurry outlet holes;
and step S9, performing secondary high-pressure cement slurry pressure injection treatment on the grouting holes.
Further, in step S1, during the construction of the cast-in-situ bored pile, three to four acoustic pipes are embedded into the pile body of the cast-in-situ bored pile, and after the construction is completed and reaches a certain age, the defects of the pile are detected by using an acoustic transmission instrument;
in the step S2, a pile body of the cast-in-situ bored pile is drilled and sampled by a drill, the formed hole is a cored hole, and then it is determined by a pile body sample: type, location, area and thickness of the defect.
Further, in the step S3, drilling a processing hole in the pile body of the cast-in-situ bored pile by using a drilling machine, wherein the diameter of the processing hole is 11 cm; selecting the core-pulling holes as the processing holes, and increasing the number of the missing processing holes when the number of the processing holes to be arranged is higher than the actual number of the core-pulling holes;
the number of the processing holes is at least two, and the bottoms of the processing holes are at least 50cm below the positions where the defects are located.
Further, in the step S4, the cement is consolidated by compaction grouting, and the amount of cement is 144kg/m3The water-cement ratio is controlled to be 0.5-0.6, and the grouting pressure is controlled to be 0.4-0.5 MPa; and if the slurry does not sink, stopping grouting, increasing the grouting pressure to 0.6MPa, continuing grouting, and if the slurry does not sink within 10-15 min after the continuous grouting, finishing the consolidation treatment operation.
Further, in step S5, the high-pressure jet cutting and removing process specifically includes:
inserting a high-pressure rotary spraying pipe into the processing hole, wherein the length of the high-pressure rotary spraying pipe is 6cm, four holes with the aperture of 1.8mm are uniformly distributed at the periphery of the bottom of the high-pressure rotary spraying pipe, the high-pressure rotary spraying pipe rotates at a high speed at the defective part of the pile body to form a cutting water disc, and the cutting water disc performs rotary spraying, cutting and cleaning treatment on the defective part of the pile body; the high-pressure rotary spraying pipe is used for repeatedly carrying out rotary spraying, cutting and cleaning treatment on the defective part from bottom to top and from top to bottom; the area treated by the high-pressure rotary spraying pipe needs to cover the defect part, and the upper part and the lower part of the area exceed the defect part by more than 50 cm;
the spraying pressure value of the high-pressure rotary spraying pipe is 28-30 MPa; the rotating speed is 15-18r/min, the lifting speed is 15cm/min, and the discharge capacity is 60-70L/min.
Further, the step S6 is specifically: and arranging an air hose in the treatment hole, carrying out combined deslagging treatment in the hole by adopting an air lift method in combination with the operation of pressing water downwards, pumping out larger particles in the treatment hole by adopting a sand pump, and repeating the steps until clear water returns from each treatment hole.
When the gas lift method is used for slag removal treatment in the hole, the air quantity is set to be 9m3More than min, and the pressure is set to be more than 0.7 MPa.
Further, in step S7, the high-pressure cement slurry pressure injection processing specifically includes:
firstly, selecting a processing hole, inserting a high-pressure rotary jet pipe into the processing hole, then performing cement paste pressure injection by adopting high-pressure cement paste equipment, and finally completing the operation of pressure cement paste pressure injection processing when the specific gravity of cement paste returned from the other processing holes is the same as that of the injected cement paste and all the processing holes are filled with cement paste;
when the cement paste is injected, the pressure is controlled to be 1.0MPa, and the specific gravity of the cement paste is detected in a field detection mode.
Further, in the step S8, the orifice pipe includes a flange plate, an expansion screw is disposed on the flange plate, and the orifice pipe is fixedly connected to the concrete on the top of the bored pile through the expansion screw; the lower end of the orifice pipe is sealed by epoxy resin cement mortar and is tightly cemented with the pile body.
Further, in the step S9, the secondary high-pressure cement slurry is continuously injected until the gap generated when the step S7 is performed is filled up, with the injection pressure of the secondary high-pressure cement slurry being 2.0 MPa.
Further, in the step S7 and the step S9, the cement strength of the cement paste is one grade higher than that of the cement used for the bored pile, the water cement ratio of the cement paste is less than 0.45, 0.6% of an expanding agent, 3% of a water reducing agent and a retarder are added, and the specific gravity of the cement paste is more than 1.9g/cm3。
The invention has the beneficial effects that:
1. compared with the prior art, the high-pressure jet cutting and grouting treatment process has the advantages that high-pressure water jet is adopted to remove mud inclusion and segregation loose concrete at the defect part, then sediment impurities are removed by combining a gas lift method, after the removal is finished, the jet grouting pipe is sunk to the bottom of the hole for high-pressure grouting, and finally secondary high-pressure grouting is carried out, so that the strength and the bearing capacity of the defect pile foundation treated by the process are greatly improved, and the process has the advantages of short construction period and low cost.
2. The invention consolidates the soil outside the pile by a compaction grouting method, thereby not only effectively preventing the problem that the soil outside the pile collapses when hydraulic high-pressure jet cutting is carried out inside the pile, but also greatly reducing the cost.
3. The invention adopts the combination of high-pressure rotary jet cutting and removing slag with a gas lift method, and solves the problem of poor treatment effect caused by the fact that the common rotary jet cutting cannot effectively clean the defect part.
4. The invention solves the problems of easy shrinkage, gaps and the like of cement paste caused by large water cement ratio by a secondary grouting measure, and greatly improves the grouting reinforcement effect.
5. According to the invention, through a large number of experiments, the optimal injection pressure value of the high-pressure rotary spray pipe is mastered; rotational speed, lift speed and displacement; and the technical parameters such as the proportion of cement paste and the like well guide the construction.
Drawings
Figure 1 is a schematic view of a defective type i pile.
Figure 2 is a schematic view of a defect type ii pile.
Fig. 3 is a schematic diagram of soil consolidation outside a defective I-shaped pile.
FIG. 4 is a process flow diagram of the present invention.
In the figure: 1-sounding pipe; 2-core-pulling holes; 3-treating the pores; 4-intact part of pile body; 5-defective part of pile body; 6-consolidation of soil outside the pile.
Detailed Description
In order that the invention may be better understood, the invention will now be further illustrated by the following examples, which are intended to be illustrative only and are not to be construed as limiting the invention in any way: the invention is not described in detail, but is well known to those skilled in the art.
Example 1
Referring to fig. 2 and 4, the defective part 5 of the pile body is located in the pile body, the defective part 5 of the pile body is wrapped by the intact part 4 of the pile body, and the outer wall of the pile body is not damaged greatly.
Step S1, detecting the integrity of the cast-in-situ bored pile body
Specifically, in the embodiment, the integrity of the pile body is detected by using a sound wave transmission method, that is, a plurality of sound detection tubes 1 are embedded during pile construction, specifically, several sound detection tubes are arranged according to different pile diameters, in the embodiment, four sound detection tubes 1 are embedded, and after the pile construction is completed and reaches a certain age, a sound wave transmission instrument is used for detecting the defects of the pile.
Step S2, drilling the bored pile body and performing core-pulling sampling;
specifically, the hole left after the drilling treatment is a cored hole 2, and the aperture of the cored hole 2 is 11 cm; the acoustic transmission method can detect the general type, position, area and thickness of the pile body defect, but all are not very accurate. For this purpose, the type, location, area and thickness of the defect must be further defined by core-pulling drilling.
Step S3, determining the type, position, area and thickness of the defect according to the step S1 and the step S2, further determining the hole position, number and depth of the processing hole 3 according to the type, position, area and thickness of the defect, and drilling the processing hole 3;
specifically, the number of the processing holes 3 is determined according to the area of the defect, the number of the processing holes 3 is not less than 2, and the depth of the hole drill is not less than 50cm below the pile defect part. The number of the processing holes 3 is not less than 2 in order to ensure that a passage can be formed in a defective portion, the aperture of the processing hole 3 is 11cm, the core hole 2 is selected as the processing hole 3, and when the number of the processing holes 3 to be arranged is higher than the number of the actual core holes 2, the number of the missing processing holes 3 is increased.
Step S5, performing high-pressure rotary jet cutting and clearing treatment on the defective part until all the treatment holes 3 are communicated;
specifically, the high-pressure jet cutting and removing treatment comprises the following steps: arranging a high-pressure rotary spraying pipe in the processing hole 3, wherein the length of the high-pressure rotary spraying pipe is 6cm, four holes with the aperture of 1.8mm are uniformly distributed at the periphery of the bottom of the high-pressure rotary spraying pipe, the high-pressure rotary spraying pipe rotates at a high speed at the defective part of the pile body to form a cutting water disc, and the cutting water disc performs rotary spraying, cutting and cleaning treatment on the defective part of the pile body; the high-pressure rotary spraying pipe is used for repeatedly carrying out rotary spraying, cutting and cleaning treatment on the defective part from bottom to top and from top to bottom; the defect part is required to be covered in the area treated by the high-pressure rotary spraying pipe, and the upper part and the lower part of the area exceed the defect part by more than 50cm so as to ensure that no blind area is left; the defect parts of the processing holes 3 are cut and cleaned respectively, so that the defect problem is thoroughly eliminated and the processing holes 3 are communicated with each other;
the jet pressure value, the rotating speed, the lifting speed and the discharge capacity of the high-pressure rotary jet pipe are determined according to the type, the position, the area and the thickness of the pile body defect.
The effect is better, in the embodiment, the injection pressure value of the high-pressure rotary spray pipe is 28 MPa; the rotating speed is 15r/min, the lifting speed is 15cm/min, and the discharge capacity is 60L/min.
Step S6, carrying out gas lift slag removal treatment on each processing hole 3 until each processing hole 3 is completely treated;
specifically, a ventilating hose is arranged in the processing hole 3, the gas lift method is adopted to carry out slag removal processing in the hole in combination with the operation of pressing water downwards, larger particles in the processing hole 3 are pumped out by a sand pump, and the operation is repeatedly carried out in the hole mode until clear water returns from each processing hole 3; when the gas lift method is used for slag removal treatment in the hole, the air quantity needs to be set to be 9m3More than min, and the pressure is set to be more than 0.7 MPa.
In this embodiment, to achieve a more excellent effect, the air volume is set to 15m3And/min, the pressure is set to be 0.9MPa, more cement gravel and broken stone are sprayed out from the treatment hole 3 at the initial stage of slag removal, and then water gradually becomes clear, which shows that the cleaning effect is good.
Step S7, grouting the grouting holes by using high-pressure cement slurry equipment; until the injected cement paste and the water returned from the grout outletThe specific gravity of the mud is consistent and each treatment hole 3 is filled with the cement slurry. The cement grade adopted by the cement paste is higher than that adopted by the bored pile body, the cement-water-cement ratio adopted by the cement paste is less than 0.45, and the specific gravity is more than 1.9g/cm3In addition, 0.6% of expanding agent, 3% of water reducing agent and a proper amount of retarder are added, in the embodiment, in order to achieve better effect, the cement water cement ratio adopted by the cement paste is 0.41, and the specific gravity is 2.0g/cm3。
Step S8, an orifice pipe is provided at the orifice position of each processing orifice 3, one processing orifice 3 is selected as a grouting orifice from the plurality of processing orifices 3, and the remaining processing orifices 3 are outlet orifices. The hole pipe is fixedly connected with pile top concrete through an expansion screw by utilizing a flange plate on the pipe, and the lower end of the hole pipe is sealed by epoxy resin cement mortar and is tightly cemented with a pile body.
After step S8 is completed, a second injection of cement slurry is performed, the pressure applied to the injection cement slurry is 2.0MPa, and the injection cement slurry is stabilized for 30 minutes to fill up the pores that may appear during shrinkage and the first pressing.
Example 2
Referring to fig. 1 and 4, a defective pile body portion 5 includes an outer wall of a pile body, and for this defect, the present embodiment provides another method for processing a quality defect of a cast-in-situ bored pile, where the method for processing a quality defect of a cast-in-situ bored pile provided by the present embodiment is different from the method in embodiment 1 in that:
after the step S3 is completed, before the step S5 is performed, that is, in the step S4, when it is determined that the type of the defect is the defect type reflected in fig. 1, a compaction grouting process is required to perform grouting consolidation on the soil outside the pile at the defective part 5 of the pile body, that is, the soil consolidating part 6 outside the pile, so as to prevent the soil outside the pile from being collapsed when hydraulic high-pressure jet cutting is performed inside the pile; in some practical engineering situations, under the condition that the injection pressure value, the rotation speed, the lifting speed and the discharge capacity of the high-pressure rotary jet pipe cannot be accurately determined, a compaction grouting process can be adopted to perform grouting consolidation on the soil outside the pile at the defective position so as to prevent the soil outside the pile from collapsing when hydraulic high-pressure rotary jet cutting is performed inside the pile, and the operation can reduce the risk of engineering construction.
In this embodiment, in step S4, the compaction grouting method is performed by using a vibrating plate for steel pipes to be pressed into the soil layer to a designed depth, and using a construction sequence of jumping holes from bottom to top and grouting at intervals. The specific parameters are as follows: the cement amount is 144kg/m3, the water cement ratio is 0.5, the grouting pressure is 0.5MPa, and the grouting is stopped when the slurry does not sink within 15 min. The effective diameter of the grouting is 1.0 m.
In the present embodiment, in step S5, the injection pressure value of the high-pressure rotary nozzle is 30 Mpa; the rotating speed is 18r/min, the lifting speed is 15cm/min, and the discharge capacity is 70L/min.
In this embodiment, in step S6, when the in-hole slag removal treatment is performed by the gas lift method, the air flow rate is set to 9m3Min, the pressure was set at 0.7 MPa.
In this example, in step S7, the cement paste used has a cement-water-cement ratio of 0.40 and a specific gravity of 2.1g/cm3。
Example 3
And (3) carrying out cast-in-situ bored pile defect treatment on the new Ji salt highway bridge, wherein the new Ji salt highway bridge consists of a salina sea-crossing bridge section and A, B line approaches on two banks, and the overall length of the project is 3.899 km. Wherein the length of the saltern sea-crossing bridge section is 1298.362m, and the width is 23.5 m; the length of the approach A line is 469.783m, and the width is 24.5 m; the length of the guide way B is 2130.913m, and the width of the guide way B is 24.5 m. The sea-crossing bridge adopts a prefabricated 22 multiplied by 30mT beam to hoist and drill a cast-in-place pile foundation. The total investment of the project is 19997.26 ten thousand yuan, and the construction period is 30 months.
The detection result of the integrity of the pile foundation of the bridge 23 piles (all of which are underwater concrete with the pile diameter of 1600mm, the pile length of 47m and C30) by a detection unit by using a sound wave transmission method shows that the integrity of the pile body of 21 piles is good, and the piles can be determined as I-type piles. And if one pile body (19-3) has defects, evaluation is not carried out for the moment, and core drilling sampling is recommended to verify the integrity of the pile body. For this purpose, two holes drilled in the pile were sampled, and the results show: the pile body of the 19-3 pile has a honeycomb phenomenon in the first hole with the diameter of 2.2-3.7 m, the sediment at the bottom of the pile is too thick, and the mud sand and concrete are seriously separated. The second hole has serious concrete segregation honeycombs within 0-2 m downward of the pile head, serious sand inclusion at the position of 19 m and 20CM thickness.
And aiming at the core sampling detection result, determining to adopt the method for processing. The problems of mud-included sand and concrete segregation are solved by high-pressure rotary jet cutting treatment on the defect, the pile body is reinforced by high-pressure cement slurry compaction grouting, and the integrity of the pile body is good through secondary sound wave transmission method pile foundation integrity detection, so that the standard requirement of the type I pile is met.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method for processing quality defects of cast-in-situ bored piles is characterized by comprising the following steps:
step S1, detecting the integrity of the cast-in-situ bored pile body;
step S2, drilling, core-pulling and sampling the bored pile body;
step S3, determining the type, position, area and thickness of the defect according to the step S1 and the step S2, further determining the hole position, number and depth of the processing hole according to the type, position, area and thickness of the defect, and drilling the processing hole;
step S4, judging whether the cast-in-situ bored pile belongs to a defective I-shaped pile or not according to the type, position, area and thickness of the defect, and if the cast-in-situ bored pile belongs to the defective I-shaped pile, performing consolidation treatment on a soil body outside the cast-in-situ bored pile;
step S5, performing high-pressure rotary jet cutting and clearing treatment on the defective part until all the treatment holes are communicated;
step S6, carrying out gas lift slag removal treatment on each processing hole until each processing hole is cleaned;
step S7, performing high-pressure cement slurry pressure injection treatment on the treatment holes;
step S8, arranging an orifice pipe at the orifice position of each processing hole, selecting one processing hole as a grouting hole from the plurality of processing holes, and taking the rest processing holes as slurry outlet holes;
and step S9, performing secondary high-pressure cement slurry pressure injection treatment on the grouting holes.
2. The method for processing quality defects of a cast-in-situ bored pile according to claim 1, wherein in step S1, during construction of the cast-in-situ bored pile, three to four acoustic pipes are embedded in the pile body of the cast-in-situ bored pile, and after a certain period of time after construction is completed, defects of the pile are detected by using an acoustic transilluminator;
in the step S2, a pile body of the cast-in-situ bored pile is drilled and sampled by a drill, the formed hole is a cored hole, and then it is determined by a pile body sample: type, location, area and thickness of the defect.
3. The method for processing the quality defect of the cast-in-situ bored pile according to claim 2, wherein in step S3, a processing hole is drilled in the pile body of the cast-in-situ bored pile by a drilling machine, and the diameter of the processing hole is 11 cm; selecting the core-pulling holes as the processing holes, and increasing the number of the missing processing holes when the number of the processing holes to be arranged is higher than the actual number of the core-pulling holes;
the number of the processing holes is at least two, and the bottoms of the processing holes are at least 50cm below the positions where the defects are located.
4. The method for processing quality defects of cast-in-situ bored pile according to claim 3, wherein the consolidation process is performed by a compaction grouting method in step S4, and the amount of cement is selected to be 144kg/m3The water-cement ratio is controlled to be 0.5-0.6, and the grouting pressure is controlled to be 0.4-0.5 MPa; and if the slurry does not sink, stopping grouting, increasing the grouting pressure to 0.6MPa, continuing grouting, and if the slurry does not sink within 10-15 min after the continuous grouting, finishing the consolidation treatment operation.
5. The method for processing the quality defect of the cast-in-situ bored pile according to claim 4, wherein in step S5, the high-pressure jet cutting and removing process specifically comprises:
inserting a high-pressure rotary spraying pipe into the processing hole, wherein the length of the high-pressure rotary spraying pipe is 6cm, four holes with the aperture of 1.8mm are uniformly distributed at the periphery of the bottom of the high-pressure rotary spraying pipe, the high-pressure rotary spraying pipe rotates at a high speed at the defective part of the pile body to form a cutting water disc, and the cutting water disc performs rotary spraying, cutting and cleaning treatment on the defective part of the pile body; the high-pressure rotary spraying pipe is used for repeatedly carrying out rotary spraying, cutting and cleaning treatment on the defective part from bottom to top and from top to bottom; the area treated by the high-pressure rotary spraying pipe needs to cover the defect part, and the upper part and the lower part of the area exceed the defect part by more than 50 cm;
the spraying pressure value of the high-pressure rotary spraying pipe is 28-30 MPa; the rotating speed is 15-18r/min, the lifting speed is 15cm/min, and the discharge capacity is 60-70L/min.
6. The method for processing the quality defect of the cast-in-situ bored pile according to claim 5, wherein the step S6 specifically includes: arranging an air hose in the treatment hole, performing combined deslagging treatment in the hole by adopting an air lift method in combination with the operation of pressing water downwards, pumping out larger particles in the treatment hole by adopting a sand pump, and repeating the steps until clear water returns from each treatment hole;
when the gas lift method is used for slag removal treatment in the hole, the air quantity is set to be 9m3More than min, and the pressure is set to be more than 0.7 MPa.
7. The method for processing the quality defect of the cast-in-situ bored pile according to claim 6, wherein in step S7, the high-pressure cement slurry injection processing is specifically:
firstly, selecting a processing hole, inserting a high-pressure rotary jet pipe into the processing hole, then performing cement paste pressure injection by adopting high-pressure cement paste equipment, and finally completing the operation of pressure cement paste pressure injection processing when the specific gravity of cement paste returned from the other processing holes is the same as that of the injected cement paste and all the processing holes are filled with cement paste;
when the cement paste is injected, the pressure is controlled to be 1.0MPa, and the specific gravity of the cement paste is detected in a field detection mode.
8. The method according to claim 7, wherein in step S8, the orifice tube includes a flange plate, the flange plate is provided with an expansion screw, and the orifice tube is fixedly connected to the concrete on the top of the bored pile through the expansion screw; the lower end of the orifice pipe is sealed by epoxy resin cement mortar and is tightly cemented with the pile body.
9. The method for processing quality defects of a bored pile according to claim 8, wherein in step S9, the secondary high-pressure cement slurry pressure is 2.0MPa, and the cement slurry is continuously injected until the gaps generated when step S7 is performed are filled.
10. The method for processing the quality defect of the bored pile according to claim 9, wherein in the steps S7 and S9, the cement strength of the cement paste is higher than the cement strength of the bored pile by one grade, the water cement ratio of the cement paste is less than 0.45, 0.6% of an expansion agent, 3% of a water reducing agent and a retarder are added, and the specific gravity of the cement paste is greater than 1.9g/cm3。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529829A (en) * | 2021-07-02 | 2021-10-22 | 中铁十九局集团华东工程有限公司 | Method for treating excessive thickness of pile bottom sediment of long and large pile foundation and pile body concrete interlayer or loose |
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| CN115467325A (en) * | 2022-09-12 | 2022-12-13 | 厦门捷航工程检测技术有限公司 | Disease repairing treatment process for inclined long pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113529829A (en) * | 2021-07-02 | 2021-10-22 | 中铁十九局集团华东工程有限公司 | Method for treating excessive thickness of pile bottom sediment of long and large pile foundation and pile body concrete interlayer or loose |
| CN113774970A (en) * | 2021-08-05 | 2021-12-10 | 深圳宏业基岩土科技股份有限公司 | Cast-in-place pile socketed section defect repairing construction method |
| CN113897962A (en) * | 2021-10-27 | 2022-01-07 | 福建建中岩土工程有限责任公司 | Novel underground continuous wall sediment treatment method |
| CN114622553A (en) * | 2022-03-22 | 2022-06-14 | 陈倩 | Defect bored concrete pile maintenance processing method |
| CN115467325A (en) * | 2022-09-12 | 2022-12-13 | 厦门捷航工程检测技术有限公司 | Disease repairing treatment process for inclined long pile |
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