CN114875893A - Post-grouting construction process for cast-in-situ bored pile - Google Patents
Post-grouting construction process for cast-in-situ bored pile Download PDFInfo
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- CN114875893A CN114875893A CN202210463165.7A CN202210463165A CN114875893A CN 114875893 A CN114875893 A CN 114875893A CN 202210463165 A CN202210463165 A CN 202210463165A CN 114875893 A CN114875893 A CN 114875893A
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- grouting
- side pipe
- pipe assembly
- reinforcement cage
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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
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- 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
Abstract
The invention discloses a post-grouting construction process of a cast-in-situ bored pile, which is characterized in that a grouting side pipe is provided with a first grouting side pipe component and a second grouting side pipe component which are split, and the first grouting side pipe component and the second grouting side pipe component are fixed together through a connecting piece, so that the strength of the joint of the first grouting side pipe component and the second grouting side pipe component is improved, the deformation or fracture of the joint is prevented, the blockage of a grouting pipe is prevented, and the normal grouting operation is influenced. Before the steel reinforcement cage is transferred, firstly, first slip casting side pipe assembly is sleeved on the steel reinforcement cage to enable the first slip casting side pipe assembly to move downwards along with the steel reinforcement cage, when the steel reinforcement cage moves downwards to the top of the first slip casting side pipe assembly, the pile hole is completely entered, the second slip casting side pipe assembly is connected to the first slip casting side pipe assembly, the process is fast and convenient to install, the time required by welding is saved, the slip casting efficiency is improved, and the cost of human resources is reduced.
Description
Technical Field
The invention relates to the technical field of pile hole pouring, in particular to a post-grouting construction process for a cast-in-situ bored pile.
Background
At present, with the diversification of building design forms, building foundation construction also becomes complicated, and the construction difficulty of building foundation pits and foundation piles is increased more and more. Whether the mud jacking pipes at the empty drilling part are connected and positioned quickly or not directly influences the construction period and the construction difficulty. At present, in the construction of an ultra-long hollow drill of a foundation pile, a plurality of grouting pipes are generally spliced and welded at a hollow drill part, and then the whole grouting pipe is fixed on a reinforcement cage and enters a pile hole along with the reinforcement cage. Additional time consumption of workers is needed for welding the mud jacking pipe, and labor cost is increased; and because the welded intensity is not enough, cause empty drill position mud jacking pipe to warp easily, even fracture, also easily collide the quality that influences the mud jacking pipe with the pipe wall in the steel reinforcement cage transfer process in addition. The grouting pipe can be blocked after being deformed, normal grouting operation is influenced, and the whole grouting process is low in efficiency and inconvenient to operate.
Disclosure of Invention
The purpose of the invention is: the post-grouting construction process for the cast-in-situ bored pile improves the strength of the joint of the first grouting side pipe assembly and the second grouting side pipe assembly, prevents the joint from deforming or breaking, prevents the grouting pipe from being blocked and influences normal grouting operation; the time required by welding is saved, the grouting efficiency is improved, and the human resource cost is reduced.
In order to achieve the purpose, the invention provides a post-grouting construction process of a cast-in-situ bored pile, which comprises the following steps of:
manufacturing a first grouting side pipe assembly and a second grouting side pipe assembly when a pile hole is formed;
sleeving the first grouting side pipe assembly outside the bottom of the reinforcement cage, so that the first grouting side pipe assembly and the reinforcement cage are fixed together;
the reinforcement cage is lowered into a pile hole, and the first grouting side pipe assembly stops moving when completely entering the pile hole;
the second grouting side pipe assembly is arranged above the first grouting side pipe assembly through a connecting piece, and the reinforcement cage continues to descend after the second grouting side pipe assembly is arranged;
pouring concrete into the pile hole, and using clear water to open slurry outlets of the first grouting side pipe assembly and the second grouting side pipe assembly after pouring is finished for 1-2 days;
and after the pouring is finished for 2-3 days, inputting cement slurry into the poured pile hole through the first grouting side pipe assembly and the second grouting side pipe assembly to finish grouting.
Compared with the prior art, the post grouting construction process of the cast-in-situ bored pile has the beneficial effects that: according to the grouting side pipe assembly, the grouting side pipes are arranged into the split first grouting side pipe assembly and the split second grouting side pipe assembly, and the first grouting side pipe assembly and the second grouting side pipe assembly are fixed together through the connecting piece, so that the strength of the joint of the first grouting side pipe assembly and the second grouting side pipe assembly is improved, the joint is prevented from being deformed or broken, and the grouting pipe is prevented from being blocked to influence normal grouting operation; determining the size when a pile hole is formed, and starting to manufacture a first grouting side pipe assembly and a second grouting side pipe assembly; before the steel reinforcement cage is transferred, firstly, first slip casting side pipe assembly is sleeved on the steel reinforcement cage to enable the first slip casting side pipe assembly to move downwards along with the steel reinforcement cage, when the steel reinforcement cage moves downwards to the top of the first slip casting side pipe assembly, the pile hole is completely entered, the second slip casting side pipe assembly is connected to the first slip casting side pipe assembly, the process is fast and convenient to install, the time required by welding is saved, the slip casting efficiency is improved, and the cost of human resources is reduced.
According to the post-grouting construction process of the bored pile, the first grouting side pipe assembly is connected to at least two end grouting pipes in the reinforcement cage before being sleeved outside the bottom of the reinforcement cage, and the upper ends and the lower ends of the end grouting pipes extend out of the reinforcement cage.
According to the post-grouting construction process of the bored pile, the end grouting pipe is symmetrically bound on a main reinforcement of the reinforcement bottom cage by adopting iron wires, the bottom of the end grouting pipe exceeds the bottom of the reinforcement bottom cage by at least 200mm, and the top of the end grouting pipe exceeds the ground by at least 300 mm.
According to the post-grouting construction process of the bored pile in the embodiment of the invention, the first grouting side pipe assembly comprises a first annular grouting pipe horizontally arranged and a first vertical grouting pipe vertically arranged, the bottoms of the first vertical grouting pipe and the first annular grouting pipe are respectively provided with the slurry outlet, the first annular grouting pipe is sleeved on the reinforcement cage, and the first vertical grouting pipe is connected to the first annular grouting pipe.
According to the post-grouting construction process of the bored pile, the top of the first vertical grouting pipe is provided with a connecting piece, the second grouting side pipe assembly comprises a second annular grouting pipe horizontally arranged and a second vertical grouting pipe vertically arranged, the bottoms of the second vertical grouting pipe and the second annular grouting pipe are both provided with the slurry outlet, the second annular grouting pipe is sleeved on the reinforcement cage, the second vertical grouting pipe is connected to the second annular grouting pipe, and the bottom of the second vertical grouting pipe is inserted into the connecting port during assembly.
According to the post-grouting construction process of the cast-in-situ bored pile, the second vertical grouting pipe corresponds to the first vertical grouting pipe in position, the connecting piece comprises a threaded connecting piece or a buckling piece, and the distance between the adjacent first vertical grouting pipes is smaller than 2 m.
According to the post-grouting construction process of the cast-in-situ bored pile, the cement slurry is prepared by mixing the portland cement and clear water, and the mass proportion of the clear water to the portland cement is 0.4-0.6.
According to the post-grouting construction process of the cast-in-situ bored pile, when cement grout is input, the cement grout with the mass proportion of the clear water and the portland cement of 0.6 is input at the pressure not less than 2.5Mpa, then the pressure is gradually increased, and the cement grout with the mass proportion of the clear water and the portland cement of 0.4-0.5 is input.
According to the post-grouting construction process of the cast-in-situ bored pile, before grouting, the slurry outlets of the first grouting side pipe assembly and the second grouting side pipe assembly are blocked by the drawing pins and are wrapped and sealed by the rubber sheets and the waterproof adhesive tapes.
According to the post-grouting construction process of the bored pile in the embodiment of the invention, when the reinforcement cage is put into a pile hole, clear water is continuously injected into the first grouting side pipe assembly and the second grouting side pipe assembly so as to balance the pressure in the hole and check the arrangement condition of the grouting pipes, and when the first grouting side pipe assembly and the second grouting side pipe assembly are found to be damaged, leak water and be blocked, the first grouting side pipe assembly and the second grouting side pipe assembly are required to be immediately maintained or replaced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a reinforcement cage in a cast-in-situ bored pile post-grouting construction process according to an embodiment of the present invention.
In the figure, 1, a first grouting side pipe assembly; 11. a first annular grouting pipe; 12. a first vertical grouting pipe; 13. a connecting member; 2. a second grouting side pipe assembly; 21. a second annular grouting pipe; 22. a second vertical grouting pipe; 3. an end grouting pipe; 4. and (4) a reinforcement cage.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a post-grouting construction process of a cast-in-situ bored pile according to a preferred embodiment of the present invention includes the following steps:
s1: manufacturing a first grouting side pipe assembly 1 and a second grouting side pipe assembly 2 during pile hole forming;
s2: sleeving the first grouting side pipe assembly 1 outside the bottom of the reinforcement cage 4 to fix the first grouting side pipe assembly and the reinforcement cage 4 together;
s3: the reinforcement cage 4 is put into the pile hole, and the first grouting side pipe assembly 1 stops moving when completely entering the pile hole;
s4: the second grouting side pipe assembly 2 is arranged above the first grouting side pipe assembly 1 through a connecting piece 13, and the reinforcement cage 4 continues to descend after the installation is finished;
s5: pouring concrete into the pile hole, and after pouring is completed for 1-2 days, using clear water to open slurry outlets of the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2;
s6: and after the pouring is finished for 2-3 days, inputting cement slurry into the poured pile hole through the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2, and finishing grouting.
In the post-grouting construction process of the cast-in-situ bored pile according to the preferred embodiment of the present application, the size is determined when a pile hole is formed, and the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2 are manufactured; before steel reinforcement cage 4 transferred, earlier with first slip casting side pipe subassembly 1 suit make it can be down together with steel reinforcement cage 4 on steel reinforcement cage 4, stop when steel reinforcement cage 4 descends to the top of first slip casting side pipe subassembly 1 gets into the stake hole completely, connect second slip casting side pipe subassembly 2 on first slip casting side pipe subassembly 1, the required time of welding has been saved to this processing mode, has improved mud jacking efficiency, has reduced manpower resources cost.
As shown in fig. 1, in some embodiments of the present invention, the grouting side pipes are provided as a first grouting side pipe assembly 1 and a second grouting side pipe assembly 2 which are separated, and the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2 are fixed together by a connecting member 13, so that the strength of the joint of the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2 is improved, the joint is prevented from being deformed or broken, and the grouting pipes are prevented from being blocked, which affects normal grouting operation.
As shown in fig. 1, in some embodiments of the present invention, before the first grouting side pipe assembly 1 is sleeved outside the bottom of the reinforcement cage 4, at least two end grouting pipes 3 are connected to the reinforcement cage 4, and the end grouting pipes 3 are arranged inside the reinforcement cage 4 and will not collide with the pile wall when being lowered. The upper end and the lower end of the end grouting pipe 3 extend out of the reinforcement cage 4, and the end grouting pipe is used for grouting at the bottom of a pile hole, so that the vacancy at the bottom of the pile hole is supplemented with grout, and the vacancy of the side grouting pipe is supplemented.
In some embodiments of the present invention, the end grouting pipes 3 are symmetrically tied to the main reinforcement of the reinforcement bottom cage by using iron wires, so that the end grouting pipes 3 are firmly fixed, and the symmetrically distributed arrangement also makes the grouting range of the end grouting pipes 3 larger, thereby ensuring that the gaps in the pile holes are grouted. The bottom of end slip casting pipe 3 surpasss reinforcing cage 4 bottom 200mm at least, and the top of end slip casting pipe 3 surpasss ground 300mm at least, and the distance at upper and lower both ends sets up and makes slip casting mechanism more convenient to the downthehole slip casting of stake, and the cement thick liquid that pours into the stake hole also can obtain better diffusion. Preferably, the bottom of the end grouting pipe 3 exceeds the bottom of the reinforcement cage 4 by 200mm, and the top of the end grouting pipe 3 exceeds the ground by 300 mm.
In some embodiments of the present invention, the first grouting side pipe assembly 1 includes a horizontally arranged first annular grouting pipe 11 and a vertically arranged first vertical grouting pipe 12, the bottoms of the first vertical grouting pipe 12 and the first annular grouting pipe 11 are both provided with a slurry outlet, the first annular grouting pipe 11 is sleeved on the reinforcement cage 4, and the first vertical grouting pipe 12 is connected to the first annular grouting pipe 11. The bottom of first slip casting side pipe assembly 1 extends to the bottom of foundation pile and is used for carrying out the slip casting to the stake tip, more does benefit to the infiltration of thick liquid to the soil of stake end and stake side behind the slip casting, increases substantially the bearing capacity of stake, and the stability of quality of reinforcing stake reduces the pile foundation and subsides.
As shown in fig. 1, in some embodiments of the present invention, the top of each first vertical grout pipe 12 is provided with a connector 13. The structure of the second grouting side pipe assembly 2 is the same as that of the first grouting side pipe assembly 1, the second grouting side pipe assembly comprises a second annular grouting pipe 21 arranged horizontally and a second vertical grouting pipe 22 arranged vertically, and slurry outlets for discharging cement slurry are formed in the bottoms of the second vertical grouting pipe 22 and the second annular grouting pipe 21; the second annular grouting pipe 21 is sleeved on the reinforcement cage 4, the second vertical grouting pipe 22 is connected to the second annular grouting pipe 21, the bottom of the second vertical grouting pipe 22 is inserted into the connecting piece 13 during assembly, the second grouting side pipe assembly 2 and the first grouting side pipe assembly are assembled, convenience and rapidness are achieved, and the assembling efficiency of the grouting side pipes is improved. Specifically, the second annular grouting pipe 21 is of a split structure, and the second annular grouting pipe 21 is arranged on two sides of the reinforcement cage 4 and clamps the reinforcement cage 4 when the second grouting side pipe assembly 2 is arranged.
As shown in fig. 1, in some embodiments of the present invention, the second vertical grouting pipes 22 correspond to the first vertical grouting pipes 12, and each second vertical grouting pipe 22 is aligned with one first vertical grouting pipe 12 during installation, so that the butt joint can be completed by simple plugging, the connection through the connecting member 13 is facilitated, and the installation efficiency is improved. The connecting piece 13 comprises a threaded connecting piece 13 or a fastening piece, the installation is tight and firm, and a sealing ring is arranged between the second vertical grouting pipe 22 and the first vertical grouting pipe 12 to prevent external concrete from invading and blocking the second vertical grouting pipe 22 and the first vertical grouting pipe 12. The distance between the adjacent first vertical grouting pipes 12 is less than 2m, so that the pile holes can be completely covered by the grouting pipes.
In some embodiments of the invention, the cement grout is prepared by mixing portland cement with the same strength grade as the cast-in-place pile concrete and clear water, the mass proportion of the clear water to the portland cement is 0.4-0.6, the curing agent is matched portland cement with the proportion of more than 42.5, and the cement grout with different grey-water ratios is used for cement casting at different stages. When preparing cement slurry, firstly adding a certain amount of water in a stirrer, then adding a certain amount of Portland cement while stirring, supplementing water according to the water-cement ratio, and stirring the cement slurry to reach the corresponding scale. The stirring time is not less than 3min, and impurities such as cement stones, cement bags and the like cannot be mixed in the slurry. After the cement paste is stirred, the cement paste is filtered and then placed into a paste storage barrel, and the cement paste is also continuously stirred in the paste storage barrel.
In some embodiments of the present invention, when the cement slurry is supplied, the cement slurry is supplied at a pressure of not less than 2.5Mpa using the clear water and the portland cement having a mass specific gravity of 0.6, and then the pressure is gradually increased and the cement slurry is supplied using the clear water and the portland cement having a mass specific gravity of 0.4 to 0.5. The cement slurry is continuously input, and the pressure is gradually increased from small to large. Pressure grouting at the pile end can be completed once, or intermittent grouting, secondary grouting or multiple grouting can be adopted; the grouting time interval of two grouting pipes in the same pile is less than 12 h.
In some embodiments of the invention, the mud outlets of the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2 are plugged by a drawing pin and are wrapped and sealed by rubber and waterproof adhesive tapes before grouting, the arrangement is such that the pressure in the grouting pipes can burst the rubber and the adhesive tapes and eject the drawing pin during grouting, cement slurry is pressed into the gravel layer through the mud outlets and the pores of the drawing pin, and the arrangement can ensure that concrete slurry cannot enter the mud outlets and plug the grouting pipes during concrete pouring. Specifically, the slurry outlets are arranged in the area, close to the bottom 20cm, of the second vertical grouting pipe 22 and the first vertical grouting pipe 12, and are formed by machining the pipes through drill bits, the slurry outlets are divided into four uniform rows, each row is provided with four slurry outlets, the distance between every two adjacent slurry outlets is 3cm, and the diameter of each slurry outlet is 3 cm.
In some embodiments of the invention, when the reinforcement cage 4 is lowered into the pile hole, clean water is continuously injected into the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2, if the water level in the pipes descends, the installed grouting pipes are replaced again, the whole installation process keeps the pile wall from colliding and extruding the grouting pipes, and a special person synchronously fills in water injection inspection records. The method can balance the pressure in the hole and check the arrangement condition of the grouting pipe, and the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2 are required to be immediately repaired or replaced when being damaged, leaked and blocked.
The method comprises the following specific working steps:
a1: manufacturing a first grouting side pipe assembly 1 and a second grouting side pipe assembly 2 during pile hole forming;
a2: sleeving the end grouting pipe 3 and the first grouting side pipe assembly 1 on the reinforcement cage 4 through iron wires, and fixing the end grouting pipe 3 and the first grouting side pipe assembly 1 with the reinforcement cage 4;
a3: the reinforcement cage 4 is put into the pile hole, and the first grouting side pipe assembly 1 stops moving when completely entering the pile hole;
a4: connecting a second vertical grouting pipe 22 and a first vertical grouting pipe 12 through a connecting piece 13, pressing a split second annular grouting side pipe to the reinforcement cage 4, installing a second grouting side pipe assembly 2 above the first grouting side pipe assembly 1, fixing the second grouting side pipe assembly 2 on the reinforcement cage 4 by using an iron wire, and continuing to descend the reinforcement cage 4 after the installation is finished;
a5: pouring concrete into the pile hole, and after pouring is completed for 1-2 days, using clear water to open slurry outlets of the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2;
a6: and after 2-3 days of pouring, inputting cement grout into the poured pile hole through the first grouting side pipe assembly 1 and the second grouting side pipe assembly 2, firstly inputting the cement grout by adopting the cement grout with the mass proportion of clear water and portland cement of 0.6 and the pressure of not less than 2.5Mpa, then gradually increasing the pressure and inputting the cement grout with the mass proportion of clear water and portland cement of 0.4-0.5, and finally completing grouting.
To sum up, the embodiment of the invention provides a post grouting construction process for a cast-in-situ bored pile, which improves the strength of the joint of a first grouting side pipe assembly 1 and a second grouting side pipe assembly 2, prevents the joint from deforming or breaking, prevents a grouting pipe from being blocked, influences normal grouting operation, saves the time required by welding, improves grouting efficiency, and reduces the cost of human resources.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several 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. The post-grouting construction process of the cast-in-situ bored pile is characterized by comprising the following steps of:
manufacturing a first grouting side pipe assembly and a second grouting side pipe assembly when a pile hole is formed;
sleeving the first grouting side pipe assembly outside the bottom of the reinforcement cage to fix the first grouting side pipe assembly and the reinforcement cage together;
the reinforcement cage is lowered into a pile hole, and the first grouting side pipe assembly stops moving when completely entering the pile hole;
the second grouting side pipe assembly is arranged above the first grouting side pipe assembly through a connecting piece, and the reinforcement cage continues to descend after the second grouting side pipe assembly is arranged;
pouring concrete into the pile hole, and using clear water to open slurry outlets of the first grouting side pipe assembly and the second grouting side pipe assembly after pouring is finished for 1-2 days;
and after the pouring is finished for 2-3 days, inputting cement slurry into the poured pile hole through the first grouting side pipe assembly and the second grouting side pipe assembly to finish grouting.
2. The cast-in-situ bored pile post-grouting construction process according to claim 1, characterized in that: before the first grouting side pipe assembly is sleeved outside the bottom of the reinforcement cage, at least two end grouting pipes are connected into the reinforcement cage, and the upper end and the lower end of each end grouting pipe extend out of the reinforcement cage.
3. The cast-in-situ bored pile post-grouting construction process according to claim 2, characterized in that: the end slip casting pipe adopts iron wire symmetry ligature at the bottom of the reinforcing bar on the main muscle of cage, the bottom of end slip casting pipe surpasss reinforcing bar cage bottom 200mm at least, the top of end slip casting pipe surpasss ground 300mm at least.
4. The cast-in-situ bored pile post-grouting construction process according to claim 1, characterized in that: the first grouting side pipe assembly comprises a first annular grouting pipe arranged horizontally and a first vertical grouting pipe arranged vertically, the bottoms of the first vertical grouting pipe and the first annular grouting pipe are provided with the slurry outlet, the first annular grouting pipe is sleeved on the reinforcement cage, and the first vertical grouting pipe is connected to the first annular grouting pipe.
5. The cast-in-situ bored pile post-grouting construction process according to claim 4, characterized in that: the top of the first vertical grouting pipe is provided with a connecting piece, the second grouting side pipe assembly comprises a second annular grouting pipe horizontally arranged and a second vertical grouting pipe vertically arranged, the bottoms of the second vertical grouting pipe and the second annular grouting pipe are provided with the slurry outlet, the second annular grouting pipe is sleeved on the reinforcement cage, the second vertical grouting pipe is connected to the second annular grouting pipe, and the bottom of the second vertical grouting pipe is inserted into the connecting port during assembly.
6. The cast-in-situ bored pile post-grouting construction process according to claim 5, characterized in that: the second vertical grouting pipe corresponds to the first vertical grouting pipe in position, the connecting piece comprises a threaded connecting piece or a buckling piece, and the distance between the adjacent first vertical grouting pipes is smaller than 2 m.
7. The cast-in-situ bored pile post-grouting construction process according to claim 1, characterized in that: the cement slurry is prepared by mixing portland cement and clear water, and the mass proportion of the clear water to the portland cement is 0.4-0.6.
8. The cast-in-situ bored pile post-grouting construction process according to claim 7, characterized in that: when cement grout is input, firstly, the cement grout with the mass proportion of the clear water and the portland cement of 0.6 is input at the pressure not less than 2.5Mpa, then the pressure is gradually increased, and the cement grout with the mass proportion of the clear water and the portland cement of 0.4-0.5 is input.
9. The cast-in-situ bored pile post-grouting construction process according to claim 1, characterized in that: before grouting, the slurry outlets on the first grouting side pipe assembly and the second grouting side pipe assembly are plugged by using drawing pins and are wrapped and sealed by using rubber sheets and waterproof adhesive tapes.
10. The cast-in-situ bored pile post-grouting construction process according to claim 9, characterized in that: and when the steel reinforcement cage is put into the pile hole, the first grouting side pipe assembly and the second grouting side pipe assembly are continuously injected with clear water to balance the pressure in the hole and check the arrangement condition of the grouting pipes, and when the first grouting side pipe assembly and the second grouting side pipe assembly are found to be damaged, leak water and be immediately repaired or replaced when the first grouting side pipe assembly and the second grouting side pipe assembly are not communicated.
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| CN206110124U (en) * | 2016-10-24 | 2017-04-19 | 中铁城建集团北京工程有限公司 | Bored concrete pile stake end post grouting device |
| CN108130903A (en) * | 2017-12-21 | 2018-06-08 | 广东省水利水电第三工程局有限公司 | A kind of bored concrete pile grouting behind shaft or drift lining construction technology |
| CN213358623U (en) * | 2020-09-27 | 2021-06-04 | 中铁十四局集团第三工程有限公司 | Pile foundation post-grouting construction grouting joint |
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