CN110438986B - Pile breaking and pile splicing structure and method for bored pile - Google Patents
Pile breaking and pile splicing structure and method for bored pile Download PDFInfo
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- CN110438986B CN110438986B CN201910826880.0A CN201910826880A CN110438986B CN 110438986 B CN110438986 B CN 110438986B CN 201910826880 A CN201910826880 A CN 201910826880A CN 110438986 B CN110438986 B CN 110438986B
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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
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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
- 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
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a pile-breaking pile-splicing structure of a bored pile and a method thereof, the structure comprises three repair holes vertically drilled from the pile top of the bored pile, the depth of the three repair holes exceeds the depth of a fracture, a grouting pipe is arranged at the top end of the repair hole, a high-pressure pipe valve is arranged on the grouting pipe, a gap between the grouting pipe and the repair holes is sealed by a hole sealing layer, a loose area is formed at the periphery of the fracture in a foundation, a cement slurry injected into the grouting pipe by a grouting hose forms a connecting column, and the cement slurry flows into the loose area through the fracture and forms a reinforcing joint; the method comprises the following steps: 1. obtaining a repair hole; 2. installing a grouting pipe and a high-pressure pipe valve; 3. high-pressure hole cleaning; 4. grouting under high pressure; 5. pile breaking and pile splicing. According to the invention, only three repair holes are vertically drilled from the pile top of the bored pile, the communication characteristics between every two repair holes are utilized for hole cleaning and grouting, the circularity is good, cement slurry flows into a loosening area through a fracture to form a reinforcing joint, pile splicing is comprehensive, and the influence on the whole bored pile is small.
Description
Technical Field
The invention belongs to the technical field of pile breaking and pile extension of cast-in-situ piles, and particularly relates to a pile breaking and pile extension structure and method of cast-in-situ bored piles.
Background
The bored pile has the advantages of high construction speed, small occupied area, strong adaptability to various soil layers, high bearing capacity and the like, and is widely applied to various pile foundation projects. Because of the influence of many factors such as geological conditions, construction management, etc., the broken pile happens when the bored pile is poured, and the mode of handling the broken pile of the bored pile is commonly used: first, in-situ re-piling: the method has the advantages that after thorough cleaning, a new pile is poured in situ again to achieve thorough treatment, and the method has good effect, high difficulty, long period and high cost, and can be selected and adopted according to factors such as importance of engineering, geological conditions, defect number and the like; secondly, a shoulder pole type pile: namely, two piles are respectively increased and beaten on two sides of a broken pile, the pile tops are connected by a bearing platform, and the scheme can change the pile foundation structure form; third, a "sinking steel casing" solution: the steel pile casing with the diameter larger than that of the broken pile is pressed below the broken pile position, original broken pile concrete is manually excavated, and the concrete is poured again. Fourth, pile core sinking method: the method comprises the steps of drilling a well with the diameter of 80cm at the center of a defective pile by using an air pick, cleaning sediment in a closed manner at least exceeding the depth of the defective pile, placing a reinforcement cage, and pouring expanded concrete by using a hole-digging concrete construction method.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a broken pile splicing structure of a bored pile, which is novel and reasonable in design, and only three repairing holes are vertically drilled from the pile top of the bored pile, and the hole cleaning and grouting are performed by utilizing the communication characteristic points between every two repairing holes, so that the circularity is good, cement slurry flows into a loosening area through a broken seam to form a reinforcing joint, the pile splicing is simple, the pile splicing is comprehensive, the influence on the whole bored pile is small, the construction period is short, the cost is low, a large amount of manual consumption is avoided, the safety is good, and the popularization and the use are convenient.
In order to solve the technical problems, the invention adopts the following technical scheme: a broken pile extension structure of bored pile, its characterized in that: comprises a first repair hole, a second repair hole and a third repair hole which are vertically drilled from the pile top of a bored pile, wherein the depth of the first repair hole, the depth of the second repair hole and the depth of the third repair hole exceed the depth of a fracture, a first grouting pipe which extends into the first repair hole is arranged at the top end of the first repair hole, a first high-pressure pipe valve is arranged on a pipe section of the first grouting pipe which extends out of the first repair hole, a second grouting pipe which extends into the second repair hole is arranged at the top end of the second repair hole, a second high-pressure pipe valve is arranged on a pipe section of the second grouting pipe which extends out of the second repair hole, a third grouting pipe which extends into the third repair hole is arranged at the top end of the third repair hole, the third grouting pipe stretches out and installs the third high-pressure pipe valve on the pipe section of third restoration hole, the space between first grouting pipe and the first restoration hole, the space between second grouting pipe and the second restoration hole, and the space between third grouting pipe and the third restoration hole all pass through the hole sealing layer hole sealing, the subaerial high-pressure water pump and the high-pressure grouting pump that are provided with of drilling bored concrete pile side, the water injection pipe passes through high-pressure water pump and grouting pipe cooperation, the grouting hose passes through high-pressure grouting pump and grouting pipe cooperation, the week side that is located the fracture in ground forms not hard up district, grouting hose forms the spliced pole to the grout that the grouting pipe was injected, grout flows into not hard up district and forms the reinforcing festival through the fracture.
Foretell a drilling bored concrete pile broken pile extension structure, its characterized in that: the depth of the first repair hole, the depth of the second repair hole and the depth of the third repair hole are all 30 cm-50 cm deeper than the depth of the fracture.
Foretell a drilling bored concrete pile broken pile extension structure, its characterized in that: the length of the first grouting pipe, the length of the second grouting pipe and the length of the third grouting pipe are all 50 cm-100 cm.
Foretell a drilling bored concrete pile broken pile extension structure, its characterized in that: the first repair holes, the second repair holes and the third repair holes are uniformly distributed in the bored pile around the central axis of the bored pile.
Foretell a drilling bored concrete pile broken pile extension structure, its characterized in that: the aperture of the first repair hole, the aperture of the second repair hole and the aperture of the third repair hole are all 8 cm-10 cm.
Foretell a drilling bored concrete pile broken pile extension structure, its characterized in that: the cement paste is an ultrafine cement paste, the particle size of the ultrafine cement in the ultrafine cement paste is 0.2-20 mu m, and the average particle size of the ultrafine cement in the ultrafine cement paste is 5-6 mu m.
Meanwhile, the invention also discloses a method which has simple steps and reasonable design and can effectively connect the broken bored pile with the pile, and is characterized in that the method comprises the following steps:
step one, obtaining a repair hole: drilling three repair holes which are 30 cm-50 cm below the fracture depth on the pile top of the bored pile, wherein the three repair holes are a first repair hole, a second repair hole and a third repair hole respectively;
the aperture of the first repair hole, the aperture of the second repair hole and the aperture of the third repair hole are all 8 cm-10 cm;
the first repair hole, the second repair hole and the third repair hole are uniformly distributed in the bored pile around the central axis of the bored pile;
step two, installing a grouting pipe and a high-pressure pipe valve: a first grouting pipe extending into the first repairing hole is arranged at the top end of the first repairing hole, a first high-pressure pipe valve is arranged on a pipe section of the first grouting pipe extending out of the first repairing hole, a second grouting pipe extending into the second repairing hole is arranged at the top end of the second repairing hole, a second high-pressure pipe valve is arranged on a pipe section of the second grouting pipe extending out of the second repairing hole, a third grouting pipe extending into the third repairing hole is arranged at the top end of the third repairing hole, a third high-pressure pipe valve is arranged on a pipe section of the third grouting pipe extending out of the third repairing hole, and a hole sealing layer is arranged between the first grouting pipe and the first repairing hole, a hole sealing layer is arranged between the second grouting pipe and the second repairing hole and a hole sealing layer is arranged between the third grouting pipe and the third repairing hole sealing layer;
the length of the first grouting pipe, the length of the second grouting pipe and the length of the third grouting pipe are all 50 cm-100 cm;
step three, high-pressure hole cleaning, wherein the process is as follows:
step 301, closing a third high-pressure pipe valve, opening a first high-pressure pipe valve and a second high-pressure pipe valve, installing a water injection pipe on the first grouting pipe, injecting high-pressure water into the first grouting pipe by a high-pressure water pump, cleaning a gap and a loosening area, overflowing the high-pressure water from the second grouting pipe until the second grouting pipe overflows clear water, detaching the water injection pipe on the first grouting pipe and installing the water injection pipe on the second grouting pipe, injecting high-pressure water into the second grouting pipe by the high-pressure water pump, cleaning the gap and the loosening area, overflowing the high-pressure water from the first grouting pipe, and closing the high-pressure water pump until the clear water overflows from the first grouting pipe;
step 302, closing a first high-pressure pipe valve, opening a third high-pressure pipe valve and a second high-pressure pipe valve, installing a water injection pipe on the second grouting pipe, injecting high-pressure water into the second grouting pipe by a high-pressure water pump, cleaning a gap and a loosening area, overflowing the high-pressure water from the third grouting pipe until the third grouting pipe overflows clear water, unloading the water injection pipe on the second grouting pipe and installing the water injection pipe on the third grouting pipe, injecting high-pressure water into the third grouting pipe by the high-pressure water pump, cleaning the gap and the loosening area, overflowing the high-pressure water from the second grouting pipe, and closing the high-pressure water pump until the second grouting pipe overflows clear water;
step 303, closing a second high-pressure pipe valve, opening a first high-pressure pipe valve and a third high-pressure pipe valve, installing a water injection pipe on the third grouting pipe, injecting high-pressure water into the third grouting pipe by a high-pressure water pump, cleaning a gap and a loosening area, overflowing the high-pressure water from the first grouting pipe until the first grouting pipe overflows clear water, detaching the water injection pipe on the third grouting pipe and installing the water injection pipe on the first grouting pipe, injecting high-pressure water into the first grouting pipe by the high-pressure water pump, cleaning the gap and the loosening area, overflowing the high-pressure water from the third grouting pipe, and closing the high-pressure water pump until the third grouting pipe overflows clear water;
step 304, circulating the steps 301 to 303 for a plurality of times until clear water overflows from the first grouting pipe, the second grouting pipe and the third grouting pipe, and completing hole cleaning;
step four, high-pressure grouting, wherein the process is as follows:
step 401, opening a first high-pressure pipe valve, a second high-pressure pipe valve and a third high-pressure pipe valve, installing grouting hoses on the first grouting pipe, injecting high-pressure cement slurry into the first grouting pipe by a high-pressure grouting pump until the second grouting pipe and the third grouting pipe overflow pure cement slurry, then unloading grouting hoses on the first grouting pipe and installing the grouting hoses on the second grouting pipe, injecting high-pressure cement slurry into the second grouting pipe by the high-pressure grouting pump until the first grouting pipe and the third grouting pipe overflow pure cement slurry, unloading grouting hoses on the second grouting pipe and installing the grouting hoses on the third grouting pipe, and injecting high-pressure cement slurry into the third grouting pipe by the high-pressure grouting pump until the first grouting pipe and the second grouting pipe overflow pure cement slurry;
step 402, cycling the step 401 until high-pressure cement paste is injected into any one grouting pipe, and the other two grouting pipes overflow pure cement paste;
step 403, closing the second high-pressure pipe valve and the third high-pressure pipe valve, installing a grouting hose on the first grouting pipe, injecting high-pressure cement slurry into the first grouting pipe by the high-pressure grouting pump, and closing the first high-pressure pipe valve when the cement slurry amount injected into the first grouting pipe is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting; the second high-pressure pipe valve is opened, high-pressure gas accumulated at the top end of the second grouting pipe is discharged, a grouting hose is arranged on the second grouting pipe, high-pressure grouting pump injects high-pressure cement paste into the second grouting pipe, and when the cement paste amount injected into the second grouting pipe is larger than a cement paste amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting, the second high-pressure pipe valve is closed; the third high-pressure pipe valve is opened, high-pressure gas accumulated at the top end of the third grouting pipe is discharged, a grouting hose is arranged on the third grouting pipe, high-pressure grouting pump injects high-pressure cement paste into the third grouting pipe, and when the cement paste amount injected into the third grouting pipe is larger than a cement paste amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting, the third high-pressure pipe valve is closed;
step 404, circulating step 403 for a plurality of times until the gas in the grouting pipe is exhausted and the grouting amount is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting is completed;
step five, pile breaking and pile extension: the high-pressure cement slurry flows into the loosening area through the fracture, the loosening area is compacted, the high-pressure cement in the loosening area is solidified, the solidified high-pressure cement in the loosening area forms a reinforcing joint, the high-pressure cement in the first repairing hole, the second repairing hole and the third repairing hole is solidified, the solidified high-pressure cement in the first repairing hole, the second repairing hole and the third repairing hole respectively form a connecting column, the reinforcing joint and the solidified high-pressure cement in the fracture are communicated into a whole to connect the upper section and the lower section of the fracture to form a pile-breaking joint of the bored pile.
The method is characterized in that: and step three, the water pressure of high-pressure water injected into the first grouting pipe, the second grouting pipe and the third grouting pipe by the high-pressure water pump is 3 MPa-5 MPa.
The method is characterized in that: and step four, the high-pressure grouting pump injects high-pressure cement slurry into the first grouting pipe, the second grouting pipe and the third grouting pipe, wherein the pressure of the high-pressure cement slurry is 3 MPa-5 MPa.
The method is characterized in that: the cement paste is an ultrafine cement paste, the particle size of the ultrafine cement in the ultrafine cement paste is 0.2-20 mu m, and the average particle size of the ultrafine cement in the ultrafine cement paste is 5-6 mu m.
Compared with the prior art, the invention has the following advantages:
1. according to the structure adopted by the invention, through arranging the three repairing holes, and inserting the grouting pipe at the top end of each repairing hole, the grouting pipe is only used as a high-pressure water pump and a connecting piece for injecting water or slurry to the repairing holes, does not go deep into the hole bottoms of the repairing holes, avoids continuous lifting of the grouting pipe and continuous exhaust of the repairing holes in the grouting process, and the three repairing holes are communicated with each other through the fracture, so that cleaning and grouting of the repairing holes, the fracture and a loosening area are realized by utilizing the connectivity of the three repairing holes, the circulation is good, and the popularization and the use are facilitated.
2. According to the structure, rock soil positioned on the periphery of the fracture is communicated with the fracture, and in the process of cleaning the fracture and the three repair holes, soil and broken stone positioned on the periphery of the fracture can be taken away, so that the repair holes, the fracture and the loosening area are thoroughly cleaned, and the cleaning effect is good.
3. According to the structure, the water injection pipe is matched with the grouting pipe through the high-pressure water pump, the grouting hose is matched with the grouting pipe through the high-pressure grouting pump, cement slurry injected into the grouting pipe through the grouting hose forms a connecting column, the cement slurry flows into a loosening area through a fracture to form a reinforcing joint, the connecting column, the reinforcing joint and high-pressure cement solidified in the fracture are communicated into a whole to connect the upper section and the lower section of the fracture to form a filling pile, the pile connection is simple and the pile connection is comprehensive, the influence on the whole drilling filling pile is small, the construction period is short, the cost is low, a large amount of manual consumption is avoided, and the safety is good.
4. The method has the advantages that the steps are simple, one high-pressure pipe valve is closed, two high-pressure pipe valves are opened, a water injection pipe is arranged on one opened grouting pipe, high-pressure water is injected into the opened grouting pipe by a high-pressure water pump, a gap and a loosening area are cleaned, the high-pressure water overflows from the other opened grouting pipe until clear water overflows from the other opened grouting pipe, the opened grouting pipe is replaced for water injection, and hole cleaning of two repairing holes is completed; the closed high-pressure pipe valve is replaced, and the operation is repeated until the three grouting pipes overflow clear water, and the holes are cleared by utilizing the communication characteristic points between every two repairing holes; and the high-pressure cement slurry flows into the loosening area through the fracture, the loosening area is compacted, the high-pressure cement in the loosening area is solidified, the solidified high-pressure cement in the loosening area forms a reinforcing joint, the high-pressure cement in the first repairing hole, the second repairing hole and the third repairing hole is solidified, the solidified high-pressure cement in the first repairing hole, the second repairing hole and the third repairing hole respectively form a connecting column, the reinforcing joint and the high-pressure cement in the fracture are communicated into a whole to connect the upper section and the lower section of the fracture to form a filling pile and the lower section of the fracture, the pile breaking and the pile splicing of the drilling filling pile are completed, the pile splicing is simple and the pile splicing is comprehensive, three high-pressure pipe valves are started first before grouting, the water in the three repairing holes is discharged until the high-pressure cement slurry is injected into any grouting pipe, and the other two grouting pipes are overflowed with pure cement slurry, so that the drainage effect is good and the popularization and the use are convenient.
In summary, the invention has novel and reasonable design, only three repair holes are vertically drilled from the pile top of the bored pile, the communication characteristics between every two repair holes are utilized for hole cleaning and grouting, the circularity is good, cement slurry flows into a loose area through a fracture and forms a reinforcing joint, the pile connection is simple, the pile connection is comprehensive, the influence on the whole bored pile is small, the construction period is short, the cost is low, a large amount of manual consumption is avoided, the safety is good, and the popularization and the use are convenient.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic illustration of an un-grouted structure in the structure of the present invention.
Fig. 2 is a schematic structural diagram of the structure of the present invention after grouting.
Fig. 3 is a schematic diagram of a layout relationship of pile tops of bored piles in which a first repair hole, a second repair hole and a third repair hole are formed in the structure of the invention.
Fig. 4 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-foundation; 2-drilling a filling pile; 3-breaking the seam;
4-a first repair hole; 5-a second repair hole; 6-a third repair hole;
7-a first grouting pipe; 8-a second grouting pipe; 9-a third grouting pipe;
10-a first high-pressure pipe valve; 11-a second high-pressure pipe valve; 12-a third high pressure pipe valve;
13-a hole sealing layer; 14-a water injection pipe; 15-a high-pressure water pump;
16-loosening area; 17-reinforcing joint; 18-connecting columns;
19-grouting hose; 20-high pressure grouting pump.
Detailed Description
As shown in fig. 1 to 3, the pile-breaking pile-splicing structure for bored piles according to the present invention comprises a first repair hole 4, a second repair hole 5 and a third repair hole 6 vertically bored from the pile top of a bored pile 2, wherein the depth of the first repair hole 4, the depth of the second repair hole 5 and the depth of the third repair hole 6 exceed the depth of the breaking joint 3, a first grouting pipe 7 extending into the first repair hole 4 is installed at the top end of the first repair hole 4, a first high-pressure pipe valve 10 is installed on a pipe section of the first grouting pipe 7 extending out of the first repair hole 4, a second grouting pipe 8 extending into the second repair hole 5 is installed at the top end of the second repair hole 5, a second high-pressure pipe valve 11 is installed on a pipe section of the second grouting pipe 8 extending out of the second repair hole 5, a third grouting pipe 9 extending into the third repair hole 6 is installed at the top end of the third repair hole 6, the pipe section of the third grouting pipe 9 extending out of the third repairing hole 6 is provided with a third high-pressure pipe valve 12, a gap between the first grouting pipe 7 and the first repairing hole 4, a gap between the second grouting pipe 8 and the second repairing hole 5 and a gap between the third grouting pipe 9 and the third repairing hole 6 are sealed through a sealing layer 13, a high-pressure water pump 15 and a high-pressure grouting pump 20 are arranged on the ground beside the bored pile 2, the water injection pipe 14 is matched with the grouting pipe through the high-pressure water pump 15, a grouting hose 19 is matched with the grouting pipe through the high-pressure grouting pump 20, a loosening area 16 is formed on the periphery of the fracture 3 in the foundation 1, cement slurry injected into the grouting pipe through the grouting hose 19 forms a connecting column 18, and the cement slurry flows into the loosening area 16 through the fracture 3 and forms a reinforcing joint 17.
It should be noted that, by setting three repair holes, and each repair hole top is inserted with a grouting pipe, the grouting pipe is only used as a connecting piece for injecting water or slurry into the repair hole by the high-pressure water pump 15 and the high-pressure grouting pump 20, and does not go deep to the hole bottom of the repair hole, thereby avoiding continuous lifting of the grouting pipe and continuous exhaust of the repair hole in the grouting process, and the three repair holes are mutually communicated through the fracture 3, and cleaning and grouting of the repair hole, the fracture and the loosening area are realized by utilizing connectivity of the three repair holes, so that the circularity is good; the rock soil at the periphery of the fracture 3 is communicated with the fracture 3, and in the process of cleaning the fracture 3 and the three repairing holes, the soil and broken stone at the periphery of the fracture 3 in the foundation 1 can be taken away, so that the repairing holes, the fracture and the loosening area are thoroughly cleaned, and the cleaning effect is good; the water injection pipe 14 passes through high-pressure water pump 15 and grouting pipe cooperation, and grouting hose 19 passes through high-pressure grouting pump 20 and grouting pipe cooperation, and grouting hose 19 forms spliced pole 18 to the grout that the grouting intraductal was injected, grout flows into the not hard up district 16 and forms the reinforcing joint 17 through fracture 3, and the high-pressure cement intercommunication that solidifies in spliced pole, reinforcing joint 17 and the fracture 3 is two sections bored concrete piles about the integral connection fracture, and the pile extension is simple and pile extension is comprehensive, and is little to the influence of whole drilling bored concrete pile, and the time limit for a project is short, and is with low costs, avoids a large amount of manual consumptions, and the security is good.
In this embodiment, the depth of the first repair hole 4, the depth of the second repair hole 5 and the depth of the third repair hole 6 are all 30cm to 50cm deeper than the depth of the fracture 3.
The depth of the first repair hole 4, the depth of the second repair hole 5 and the depth of the third repair hole 6 are all 30 cm-50 cm deeper than the depth of the fracture 3, so that the formed connecting column 18 penetrates through the upper section and the lower section of the fracture 3 to form a cast-in-place pile, and the connecting column 18, the reinforcing joint 17 and the high-pressure cement solidified in the fracture 3 are communicated into a whole to connect the upper section and the lower section of the fracture 3, so that the pile splicing effect is good.
In this embodiment, the length of the first grouting pipe 7, the length of the second grouting pipe 8 and the length of the third grouting pipe 9 are all 50 cm-100 cm.
The length of the first grouting pipe 7, the length of the second grouting pipe 8 and the length of the third grouting pipe 9 are all 50 cm-100 cm, and the purpose of the grouting pipe is to serve as only connecting pieces for injecting water or grouting into the repairing hole by the high-pressure water pump 15 and the high-pressure grouting pump 20, one half of the grouting pipe stretches into the repairing hole to be connected with the repairing hole, the repairing hole is sealed, the other half of the grouting pipe stretches out of the repairing hole, and the high-pressure pipe valve is installed.
In this embodiment, the first repair hole 4, the second repair hole 5 and the third repair hole 6 are uniformly distributed in the bored pile 2 around the central axis of the bored pile 2.
It should be noted that, the first repair hole 4, the second repair hole 5 and the third repair hole 6 are uniformly distributed in the bored pile 2 around the central axis of the bored pile 2, so that the repair holes can uniformly clean and grouting the fracture 3 and the loosening area, and the circularity is good.
In this embodiment, the aperture of the first repair hole 4, the aperture of the second repair hole 5, and the aperture of the third repair hole 6 are all 8cm to 10cm.
The aperture of the first repair hole 4, the aperture of the second repair hole 5 and the aperture of the third repair hole 6 are all 8 cm-10 cm, the open pore is small, the influence on the whole bored pile is small, and the construction period is short.
In this embodiment, the cement paste is an ultrafine cement paste, the particle size of the ultrafine cement in the ultrafine cement paste is 0.2 μm to 20 μm, and the average particle size of the ultrafine cement in the ultrafine cement paste is 5 μm to 6 μm.
The superfine cement paste comprises the following components in parts by weight: 100 parts of superfine cement, 0.6-2.0 parts of filtrate reducer, 0.05-0.3 part of retarder hydroxy-sense-fork-diphosphate, 0.4 part of dispersant, 0.4 part of defoamer tributyl phosphate, 76 parts of water, GM8000 superfine cement and DSJ-S filtrate reducer; the superfine cement paste is adopted to more easily realize effective blocking of the micro-pores of the fracture 3, so that the phenomenon that the cement paste is difficult to enter the fracture 3 due to the fact that the common cement paste with large particle size is used is avoided.
A method for pile extension by pile breaking of bored piles as shown in fig. 4, comprising the following steps:
step one, obtaining a repair hole: three repair holes which are 30 cm-50 cm below the depth of the fracture 3 are drilled in the pile top of the bored pile 2, and the three repair holes are a first repair hole 4, a second repair hole 5 and a third repair hole 6 respectively;
the aperture of the first repair hole 4, the aperture of the second repair hole 5 and the aperture of the third repair hole 6 are all 8 cm-10 cm;
the first repair hole 4, the second repair hole 5 and the third repair hole 6 are uniformly distributed in the bored pile 2 around the central axis of the bored pile 2;
step two, installing a grouting pipe and a high-pressure pipe valve: a first grouting pipe 7 extending into the first repairing hole 4 is arranged at the top end of the first repairing hole 4, a first high-pressure pipe valve 10 is arranged on a pipe section of the first grouting pipe 7 extending out of the first repairing hole 4, a second grouting pipe 8 extending into the second repairing hole 5 is arranged at the top end of the second repairing hole 5, a second high-pressure pipe valve 11 is arranged on a pipe section of the second grouting pipe 8 extending out of the second repairing hole 5, a third grouting pipe 9 extending into the third repairing hole 6 is arranged at the top end of the third repairing hole 6, a third high-pressure pipe valve 12 is arranged on a pipe section of the third grouting pipe 9 extending out of the third repairing hole 6, and a hole sealing layer 13 is arranged between the first grouting pipe 7 and the first repairing hole 4, between the second grouting pipe 8 and the second repairing hole 5 and between the third grouting pipe 9 and the third repairing hole 6;
the length of the first grouting pipe 7, the length of the second grouting pipe 8 and the length of the third grouting pipe 9 are all 50 cm-100 cm;
step three, high-pressure hole cleaning, wherein the process is as follows:
step 301, closing the third high-pressure pipe valve 12, opening the first high-pressure pipe valve 10 and the second high-pressure pipe valve 11, installing the water injection pipe 14 on the first grouting pipe 7, injecting high-pressure water into the first grouting pipe 7 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the second grouting pipe 8 until the second grouting pipe 8 overflows clear water, detaching the water injection pipe 14 on the first grouting pipe 7 and installing the water injection pipe 14 on the second grouting pipe 8, injecting high-pressure water into the second grouting pipe 8 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the first grouting pipe 7, and closing the high-pressure water pump 15 until the clear water overflows from the first grouting pipe 7;
302, closing the first high-pressure pipe valve 10, opening the third high-pressure pipe valve 12 and the second high-pressure pipe valve 11, installing the water injection pipe 14 on the second grouting pipe 8, injecting high-pressure water into the second grouting pipe 8 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the third grouting pipe 9 until the third grouting pipe 9 overflows clear water, detaching the water injection pipe 14 on the second grouting pipe 8 and installing the water injection pipe 14 on the third grouting pipe 9, injecting high-pressure water into the third grouting pipe 9 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the second grouting pipe 8, and closing the high-pressure water pump 15 until the clear water overflows from the second grouting pipe 8;
step 303, closing the second high-pressure pipe valve 11, opening the first high-pressure pipe valve 10 and the third high-pressure pipe valve 12, installing the water injection pipe 14 on the third grouting pipe 9, injecting high-pressure water into the third grouting pipe 9 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the first grouting pipe 7 until the first grouting pipe 7 overflows clear water, detaching the water injection pipe 14 on the third grouting pipe 9 and installing the water injection pipe 14 on the first grouting pipe 7, injecting high-pressure water into the first grouting pipe 7 by the high-pressure water pump 15, cleaning the gap 3 and the loosening area 16, overflowing the high-pressure water from the third grouting pipe 9, and closing the high-pressure water pump 15 until the third grouting pipe 9 overflows clear water;
step 304, circulating the steps 301 to 303 for a plurality of times until clear water overflows from the first grouting pipe 7, the second grouting pipe 8 and the third grouting pipe 9, and completing hole cleaning;
step four, high-pressure grouting, wherein the process is as follows:
step 401, opening a first high-pressure pipe valve 10, a second high-pressure pipe valve 11 and a third high-pressure pipe valve 12, installing a grouting hose 19 on the first grouting pipe 7, injecting high-pressure cement slurry into the first grouting pipe 7 by a high-pressure grouting pump 20 until the second grouting pipe 8 and the third grouting pipe 9 overflow pure cement slurry, then detaching the grouting hose 19 on the first grouting pipe 7 and installing the grouting hose on the second grouting pipe 8, injecting high-pressure cement slurry into the second grouting pipe 8 by the high-pressure grouting pump 20 until the first grouting pipe 7 and the third grouting pipe 9 overflow pure cement slurry, detaching the grouting hose 19 on the second grouting pipe 8 and installing the grouting hose 19 on the third grouting pipe 9, and injecting high-pressure cement slurry into the third grouting pipe 9 by the high-pressure grouting pump 20 until the first grouting pipe 7 and the second grouting pipe 8 overflow pure cement slurry;
step 402, cycling the step 401 until high-pressure cement paste is injected into any one grouting pipe, and the other two grouting pipes overflow pure cement paste;
before grouting, three high-pressure pipe valves are opened first to drain water in the three repairing holes until high-pressure cement slurry is injected into any one grouting pipe, and the other two grouting pipes overflow pure cement slurry, so that the drainage effect is good.
Step 403, closing the second high-pressure pipe valve 11 and the third high-pressure pipe valve 12, installing a grouting hose 19 on the first grouting pipe 7, injecting high-pressure cement slurry into the first grouting pipe 7 by the high-pressure grouting pump 20, and closing the first high-pressure pipe valve 10 when the amount of cement slurry injected into the first grouting pipe 7 is greater than a cement slurry amount threshold value or the grouting pressure is greater than a grouting pressure threshold value or ground reverse grouting; the second high-pressure pipe valve 11 is opened, high-pressure gas accumulated at the top end of the second grouting pipe 8 is discharged, a grouting hose 19 is arranged on the second grouting pipe 8, high-pressure grouting pump 20 injects high-pressure cement slurry into the second grouting pipe 8, and when the amount of cement slurry injected into the second grouting pipe 8 is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting, the second high-pressure pipe valve 10 is closed; the third high-pressure pipe valve 12 is opened, high-pressure gas accumulated at the top end of the third grouting pipe 9 is discharged, a grouting hose 19 is arranged on the third grouting pipe 9, high-pressure grouting pump 20 injects high-pressure cement slurry into the third grouting pipe 9, and when the amount of cement slurry injected into the third grouting pipe 9 is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting, the third high-pressure pipe valve 10 is closed;
step 404, circulating step 403 for a plurality of times until the gas in the grouting pipe is exhausted and the grouting amount is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting is completed;
step five, pile breaking and pile extension: the high-pressure cement slurry flows into the loosening area 16 through the fracture 3, the loosening area 16 is compacted, the high-pressure cement in the loosening area 16 is solidified, the solidified high-pressure cement in the loosening area 16 forms a reinforcing joint 17, the high-pressure cement in the first repairing hole 4, the second repairing hole 5 and the third repairing hole 6 is solidified, the solidified high-pressure cement in the first repairing hole 4, the second repairing hole 5 and the third repairing hole 6 respectively forms a connecting column 18, the reinforcing joint 17 and the solidified high-pressure cement in the fracture 3 are communicated into a whole to connect the upper section and the lower section of the cast-in-place pile of the fracture 3, and the pile breaking and splicing of the cast-in-place bored pile 2 are completed.
In the present embodiment, the water pressure of the high-pressure water pump 15 injecting the high-pressure water into the first grouting pipe 7, the second grouting pipe 8 and the third grouting pipe 9 in the third step is 3MPa to 5MPa.
In this embodiment, the pressure of the high-pressure cement slurry injected into the first grouting pipe 7, the second grouting pipe 8 and the third grouting pipe 9 by the high-pressure grouting pump 20 in the fourth step is 3MPa to 5MPa.
In this embodiment, the cement paste is an ultrafine cement paste, the particle size of the ultrafine cement in the ultrafine cement paste is 0.2 μm to 20 μm, and the average particle size of the ultrafine cement in the ultrafine cement paste is 5 μm to 6 μm.
When the grouting device is used, one high-pressure pipe valve is closed, two high-pressure pipe valves are opened, a water injection pipe is arranged on one opened grouting pipe, high-pressure water is injected into the opened grouting pipe by a high-pressure water pump, a gap and a loose area are cleaned, the high-pressure water overflows from the other opened grouting pipe until the other opened grouting pipe overflows clear water, the opened grouting pipe is replaced for water injection, and the cleaning of two repairing holes is completed; the closed high-pressure pipe valve is replaced, and the operation is repeated until the three grouting pipes overflow clear water, and the holes are cleared by utilizing the communication characteristic points between every two repairing holes; and the high-pressure cement slurry flows into the loosening area through the broken seams in the same way, the loosening area is compacted, the high-pressure cement in the loosening area is solidified, the solidified high-pressure cement in the loosening area forms a reinforcing joint, the high-pressure cement in the first repairing hole, the second repairing hole and the third repairing hole is solidified, the high-pressure cement solidified in the first repairing hole, the second repairing hole and the third repairing hole respectively form a connecting column, the reinforcing joint and the high-pressure cement solidified in the broken seams are communicated into a whole to connect the upper section and the lower section of the broken seams to form a filling pile and the lower section of the broken seams, the broken pile of the drilling filling pile is completed, the pile connection is simple and the pile connection is comprehensive, the communicating characteristic clear hole and the grouting between the two repairing holes are utilized, the circularity is good, the cement slurry flows into the loosening area through the broken seams and forms the reinforcing joint, the pile connection is simple and the pile connection is comprehensive, the influence on the whole drilling pile connection is small, the construction period is short, a large amount of labor consumption is avoided, and the safety is good.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. The method for pile extension of the broken bored pile comprises the following steps of: the broken pile extension structure of the bored pile comprises a first repair hole (4), a second repair hole (5) and a third repair hole (6) which are vertically drilled from the pile top of the bored pile (2), wherein the depth of the first repair hole (4), the depth of the second repair hole (5) and the depth of the third repair hole (6) exceed the depth of a broken seam (3), a first grouting pipe (7) extending into the first repair hole (4) is arranged at the top end of the first repair hole (4), a first high-pressure pipe valve (10) is arranged on a pipe section of the first grouting pipe (7) extending out of the first repair hole (4), a second grouting pipe (8) extending into the second repair hole (5) is arranged at the top end of the second repair hole (5), a second high-pressure pipe valve (11) is arranged on a pipe section of the second grouting pipe (8) extending out of the second repair hole (5), a third grouting pipe (9) extending into the third repair hole (6) is arranged at the top end of the third repair hole (6), and a gap between the third grouting pipe (9) and the first grouting pipe (8) and the third grouting pipe (6) is arranged at the top end of the third grouting pipe (8), and the gap between the third grouting pipe (9) and the third repairing hole (6) is sealed by a sealing layer (13), a high-pressure water pump (15) and a high-pressure grouting pump (20) are arranged on the ground beside the bored pile (2), the water injection pipe (14) is matched with the grouting pipe through the high-pressure water pump (15), the grouting hose (19) is matched with the grouting pipe through the high-pressure grouting pump (20), a loosening area (16) is formed at the periphery of the fracture (3) of the foundation (1), a connecting column (18) is formed by cement slurry injected into the grouting pipe through the grouting hose (19), and the cement slurry flows into the loosening area (16) through the fracture (3) to form a reinforcing joint (17);
the method comprises the following steps:
step one, obtaining a repair hole: three repair holes which are 30 cm-50 cm below the depth of the fracture (3) are drilled on the pile top of the bored pile (2), and the three repair holes are a first repair hole (4), a second repair hole (5) and a third repair hole (6) respectively;
the aperture of the first repair hole (4), the aperture of the second repair hole (5) and the aperture of the third repair hole (6) are all 8 cm-10 cm;
the first repair hole (4), the second repair hole (5) and the third repair hole (6) are uniformly distributed in the bored pile (2) around the central axis of the bored pile (2);
step two, installing a grouting pipe and a high-pressure pipe valve: a first grouting pipe (7) extending into the first repairing hole (4) is arranged at the top end of the first repairing hole (4), a first high-pressure pipe valve (10) is arranged on a pipe section of the first grouting pipe (7) extending out of the first repairing hole (4), a second grouting pipe (8) extending into the second repairing hole (5) is arranged at the top end of the second repairing hole (5), a second high-pressure pipe valve (11) is arranged on a pipe section of the second grouting pipe (8) extending out of the second repairing hole (5), a third grouting pipe (9) extending into the third repairing hole (6) is arranged at the top end of the third repairing hole (6), a third high-pressure pipe valve (12) is arranged on a pipe section of the third grouting pipe (9) extending out of the third repairing hole (6), a gap between the first grouting pipe (7) and the first repairing hole (4), a gap between the second grouting pipe (8) and the second repairing hole (5) and a gap between the third grouting pipe (9) and the third repairing hole (6) are sealed by a hole sealing layer (13);
the length of the first grouting pipe (7), the length of the second grouting pipe (8) and the length of the third grouting pipe (9) are 50 cm-100 cm;
step three, high-pressure hole cleaning, wherein the process is as follows:
step 301, closing a third high-pressure pipe valve (12), opening a first high-pressure pipe valve (10) and a second high-pressure pipe valve (11), installing a water injection pipe (14) on the first grouting pipe (7), injecting high-pressure water into the first grouting pipe (7) by a high-pressure water pump (15), cleaning a gap (3) and a loosening area (16), overflowing the high-pressure water from the second grouting pipe (8) until the second grouting pipe (8) overflows clear water, unloading the water injection pipe (14) on the first grouting pipe (7) and installing the water injection pipe on the second grouting pipe (8), injecting high-pressure water into the second grouting pipe (8) by the high-pressure water pump (15), cleaning the gap (3) and the loosening area (16), and closing the high-pressure water pump (15) until the clear water overflows from the first grouting pipe (7);
step 302, closing a first high-pressure pipe valve (10), opening a third high-pressure pipe valve (12) and a second high-pressure pipe valve (11), installing a water injection pipe (14) on a second grouting pipe (8), injecting high-pressure water into the second grouting pipe (8) by a high-pressure water pump (15), cleaning a gap (3) and a loosening area (16), overflowing the high-pressure water from the third grouting pipe (9) until the third grouting pipe (9) overflows clear water, unloading the water injection pipe (14) on the second grouting pipe (8) and installing the water injection pipe on the third grouting pipe (9), injecting the high-pressure water into the third grouting pipe (9) by the high-pressure water pump (15), cleaning the gap (3) and the loosening area (16), and closing the high-pressure water pump (15) until the second grouting pipe (8) overflows clear water;
step 303, closing the second high-pressure pipe valve (11), opening the first high-pressure pipe valve (10) and the third high-pressure pipe valve (12), installing a water injection pipe (14) on the third grouting pipe (9), injecting high-pressure water into the third grouting pipe (9) by a high-pressure water pump (15), cleaning the gap (3) and the loosening area (16), overflowing the high-pressure water from the first grouting pipe (7) until the first grouting pipe (7) overflows clear water, unloading the water injection pipe (14) on the third grouting pipe (9) and installing the water injection pipe (14) on the first grouting pipe (7), injecting high-pressure water into the first grouting pipe (7) by the high-pressure water pump (15), cleaning the gap (3) and the loosening area (16), and closing the high-pressure water pump (15) until the third grouting pipe (9) overflows clear water;
step 304, circulating the steps 301 to 303 for a plurality of times until clear water overflows from the first grouting pipe (7), the second grouting pipe (8) and the third grouting pipe (9), and completing hole cleaning;
step four, high-pressure grouting, wherein the process is as follows:
step 401, opening a first high-pressure pipe valve (10), a second high-pressure pipe valve (11) and a third high-pressure pipe valve (12), installing a grouting hose (19) on the first grouting pipe (7), injecting high-pressure cement slurry into the first grouting pipe (7) by a high-pressure grouting pump (20) until the second grouting pipe (8) and the third grouting pipe (9) overflow pure cement slurry, then detaching the grouting hose (19) on the first grouting pipe (7) and installing the grouting hose on the second grouting pipe (8), injecting high-pressure cement slurry into the second grouting pipe (8) by the high-pressure grouting pump (20) until the first grouting pipe (7) and the third grouting pipe (9) overflow pure cement slurry, detaching the grouting hose (19) on the second grouting pipe (8) and installing the grouting hose on the third grouting pipe (9), and injecting high-pressure cement slurry into the third grouting pipe (9) by the high-pressure grouting pump (20) until the first grouting pipe (7) and the second grouting pipe (8) overflow pure cement slurry;
step 402, cycling the step 401 until high-pressure cement paste is injected into any one grouting pipe, and the other two grouting pipes overflow pure cement paste;
step 403, closing the second high-pressure pipe valve (11) and the third high-pressure pipe valve (12), installing a grouting hose (19) on the first grouting pipe (7), injecting high-pressure cement slurry into the first grouting pipe (7) by the high-pressure grouting pump (20), and closing the first high-pressure pipe valve (10) when the amount of cement slurry injected into the first grouting pipe (7) is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting; opening a second high-pressure pipe valve (11), discharging high-pressure gas accumulated at the top end of a second grouting pipe (8), installing a grouting hose (19) on the second grouting pipe (8), injecting high-pressure cement slurry into the second grouting pipe (8) by a high-pressure grouting pump (20), and closing the second high-pressure pipe valve (10) when the amount of cement slurry injected into the second grouting pipe (8) is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting; opening a third high-pressure pipe valve (12), discharging high-pressure gas accumulated at the top end of a third grouting pipe (9), installing a grouting hose (19) on the third grouting pipe (9), injecting high-pressure cement slurry into the third grouting pipe (9) by a high-pressure grouting pump (20), and closing the third high-pressure pipe valve (10) when the amount of cement slurry injected into the third grouting pipe (9) is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting;
step 404, circulating step 403 for a plurality of times until the gas in the grouting pipe is exhausted and the grouting amount is larger than a cement slurry amount threshold value or the grouting pressure is larger than a grouting pressure threshold value or ground reverse grouting is completed;
step five, pile breaking and pile extension: high-pressure cement paste flows into a loosening area (16) through a fracture (3), the loosening area (16) is compacted, high-pressure cement in the loosening area (16) is solidified, high-pressure cement solidified in the loosening area (16) forms a reinforcing joint (17), high-pressure cement in a first repairing hole (4), a second repairing hole (5) and a third repairing hole (6) is solidified, high-pressure cement solidified in the first repairing hole (4), the second repairing hole (5) and the third repairing hole (6) respectively forms a connecting column (18), and the connecting column (18), the reinforcing joint (17) and the high-pressure cement solidified in the fracture (3) are communicated into an integral connection with two sections of filling piles up and down, so that the broken pile splicing of the bored pile (2) is completed.
2. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: the depth of the first repair hole (4), the depth of the second repair hole (5) and the depth of the third repair hole (6) are both 30 cm-50 cm deeper than the depth of the fracture (3).
3. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: the length of the first grouting pipe (7), the length of the second grouting pipe (8) and the length of the third grouting pipe (9) are all 50 cm-100 cm.
4. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: the first repair holes (4), the second repair holes (5) and the third repair holes (6) are uniformly distributed in the bored pile (2) around the central axis of the bored pile (2).
5. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: the aperture of the first repair hole (4), the aperture of the second repair hole (5) and the aperture of the third repair hole (6) are all 8 cm-10 cm.
6. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: the cement paste is an ultrafine cement paste, the particle size of the ultrafine cement in the ultrafine cement paste is 0.2-20 mu m, and the average particle size of the ultrafine cement in the ultrafine cement paste is 5-6 mu m.
7. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: and step three, a high-pressure water pump (15) injects high-pressure water into the first grouting pipe (7), the second grouting pipe (8) and the third grouting pipe (9) at a water pressure of 3-5 MPa.
8. A method of pile breaking and pile extension for bored piles according to claim 1, wherein: and step four, the high-pressure grouting pump (20) injects high-pressure cement slurry into the first grouting pipe (7), the second grouting pipe (8) and the third grouting pipe (9) at the pressure of 3 MPa-5 MPa.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB954842A (en) * | 1960-12-23 | 1964-04-08 | Raymond Int Inc | Method and apparatus for forming piles in the earth |
| CN103437351A (en) * | 2013-09-18 | 2013-12-11 | 浙江省岩土基础公司 | Treatment method of deviation and fracture remediation of pile body of filling pile |
| CN210857202U (en) * | 2019-09-03 | 2020-06-26 | 机械工业勘察设计研究院有限公司 | Broken pile and pile connecting structure of cast-in-situ bored pile |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB954842A (en) * | 1960-12-23 | 1964-04-08 | Raymond Int Inc | Method and apparatus for forming piles in the earth |
| CN103437351A (en) * | 2013-09-18 | 2013-12-11 | 浙江省岩土基础公司 | Treatment method of deviation and fracture remediation of pile body of filling pile |
| CN210857202U (en) * | 2019-09-03 | 2020-06-26 | 机械工业勘察设计研究院有限公司 | Broken pile and pile connecting structure of cast-in-situ bored pile |
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