CN113463655A - Pile construction method in complex environment ultra-deep foundation pit support - Google Patents
Pile construction method in complex environment ultra-deep foundation pit support Download PDFInfo
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- CN113463655A CN113463655A CN202110776516.5A CN202110776516A CN113463655A CN 113463655 A CN113463655 A CN 113463655A CN 202110776516 A CN202110776516 A CN 202110776516A CN 113463655 A CN113463655 A CN 113463655A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention discloses a pile construction method in a complex environment ultra-deep foundation pit support, which mainly comprises the following steps: constructing a three-axis stirring pile and constructing a pile by an SPCW (shortest Path continuous wave) method; the construction of the triaxial mixing pile comprises the following steps: clearing obstacles, measuring and paying off, digging a groove, positioning a pile driver, preparing cement slurry, injecting the slurry, drilling and stirring, cleaning, shifting and the like; the construction of the pile by the SPCW method comprises the following steps: placing positioning section steel, lifting pipe piles, inserting the pipe piles, sending the pipe piles, fixing the pipe piles and the like. The invention has convenient construction and good quality.
Description
Technical Field
The invention relates to a pile construction method in a complex environment ultra-deep foundation pit support.
Background
The supporting construction of the ultra-deep foundation pit in the complex environment has the problems of difficult construction and the like, particularly in the construction of a large-span triangular steel pipe truss girder, and needs to be further improved due to the complex conditions, great construction difficulty, complex procedures and unsatisfactory engineering quality.
Disclosure of Invention
The invention aims to provide a pile construction method in a complex environment ultra-deep foundation pit support with good construction quality.
The technical solution of the invention is as follows:
a pile construction method in a complex environment ultra-deep foundation pit support is characterized by comprising the following steps:
the foundation pit supporting engineering mainly comprises: constructing a three-axis stirring pile and constructing a pile by an SPCW (shortest Path continuous wave) method;
(I) construction of three-axis mixing pile
(1) Obstacle clearing
Because the process requires continuous construction, underground obstacles in the enclosure construction area are detected and cleaned before construction, so that the construction is ensured to be carried out smoothly, and the number of construction cold joints is reduced;
(2) measuring line
Arranging a map according to side axis reference points and a containment plane provided by a design institute; paying out side lines and control lines of the fender posts according to the drawing size, setting a temporary control mark, making a technical review list, and submitting to supervision and acceptance;
(3) digging groove
Excavating a groove by using a 0.4m3 excavator according to the enclosing side line of the foundation pit, wherein the size of the groove is 1000 multiplied by 1000mm, removing underground obstacles, and timely treating the soil body of the excavated groove to ensure the normal construction of the triaxial mixing pile;
(4) pile driver in-place
A specially-assigned person uniformly commands the pile driver to be in place, a steel plate is laid under the pile driver, the conditions of the upper part, the lower part, the left part and the right part are clearly seen before the pile driver moves, the obstacles are found to be cleared in time, and the positioning condition is checked and corrected in time after the pile driver moves; the pile driver is stable and straight, and is observed by a theodolite or a plumb bob to ensure the verticality of the drilling machine; the pile position positioning deviation of the triaxial cement mixing pile is less than 15 mm; after pile forming, the deviation of the center of the pile must not exceed 50mm, and the deviation of the verticality of the pile body must not exceed 1/150;
(5) cement-soil mixing ratio
According to the characteristics of the triaxial mixing pile, the technical requirements of cement-soil ratio are as follows:
the mixing ratio is as follows: the water-cement ratio is 1.0-1.5; the mixing amount of 42.5-grade ordinary silicate cement is 22 percent, and the mixing amount of cement per cubic meter is 418 kg;
(6) preparation of cement slurry and slurry injection
Building a slurry mixing construction platform on a construction site, building a cement warehouse near the platform, and stirring cement slurry according to requirements before starting up; feeding the prepared cement slurry into a slurry storage barrel for later use; after the cement paste is prepared, the stagnation time is not more than 2 hours, and the construction interval of adjacent overlapped stirring piles is not more than 10 hours; during grouting, 2 pipelines of 2 grouting pumps are mixed with the Y-shaped joint from the inlet and injected;
(7) drilling stirring
Cement slurry is injected into the triaxial cement mixing pile in the sinking and lifting processes, the sinking and lifting speeds are strictly controlled, the slurry spraying sinking speed is not more than 1 m/min, the lifting speed is not more than 2.0 m/min, the mixing and grouting are repeated at the bottom of the pile, the mixture stays for about 1 minute, and the original record is made;
(8) cleaning and shifting
Adding clear water into the collecting hopper, starting a mortar pump, cleaning a mud jacking pipeline and other used machines, and then shifting to perform construction of the next pile;
(II) SPCW construction method pile construction
(1) Placing and positioning section steel
Placing two positioning section steels with the specification of 200mm multiplied by 200mm and the length of 2.5m in the direction vertical to the groove, placing two positioning section steels with the specification of 300mm multiplied by 320mm and the length of 8-20 m in the direction parallel to the groove, and positioning the tubular pile by using a section steel positioning clamp;
(2) pipe pile hoisting and inserting
Inserting the tubular pile after the construction of the mixing pile is finished, wherein the interval time is not more than 3 hours, the tubular pile is hoisted to align the position, the inserted mixing pile is stable, the driven pile is observed and adjusted by using two theodolites, the tubular pile is lowered after the position and the verticality of the driven pile are adjusted, and the tubular pile is inserted into the three-axis mixing pile body by using the self weight of the tubular pile; after the tubular pile cannot be sunk continuously due to the dead weight of the tubular pile, driving down the tubular pile by using a truck crane vibration hammer;
(3) tubular pile feeding device
(a) Pile sending is carried out by adopting a pile sending device;
(b) the pile feeder is a steel pile feeder with the same diameter as the pipe pile;
(4) tubular pile fixing
According to the elevation control point, a level gauge is used for guiding and placing the positioning section steel on the positioning section steel, according to the height difference between the positioning section steel and the elevation of the pile top, channel steel is placed on the positioning section steel, a hanging rib with the diameter of 14mm is welded to control the elevation of the pile top of the tubular pile, and the error is controlled within +/-5 cm;
after the cement-soil mixing pile reaches a certain hardening time, removing the hanging ribs and the groove positioning section steel;
(III) construction of support system
(1) Earth excavation: excavating a groove to the elevation of the bottom surface of the designed ring beam;
(2) paying off and positioning: a surveyor uses a theodolite to play the positions of the ring beam and the support according to a design drawing, requires that the error is less than 2cm, and marks the positions;
(3) after the lofting is finished, the measurer firstly submits the lofting result to a project engineer for acceptance, and after acceptance, the owner and the supervision are reported for acceptance, otherwise, the lofting is carried out again;
(4) and (4) rechecking: the owner, the supervision, inspection, acceptance and lofting results are checked, and after the results are qualified, the lofting sheets are signed for approval;
(5) chiseling floating slurry: chiseling floating slurry on the pile top of the support pile to the designed depth and width according to the design requirement, and cleaning a loose layer without fragments;
(6) binding steel bars: binding steel bars according to the reinforcement allocation requirements of a design drawing; during binding, the design and related standard requirements are met, and the geometric dimension error is less than 20 mm; the length of all the steel bars of the connecting beam anchored into the supporting beam is not less than 35d, and the thickness of the protecting layer of the supporting beam is 35 mm;
(7) erecting a mold: erecting the mold according to the designed width, length and height of the ring beam and the supporting beam; the vertical mold needs to be flat and straight, and the accurate geometric dimension and no gap are realized, and no slurry leakage is caused;
(8) pouring concrete: c35 commercial concrete is adopted for pouring the ring beam, and the concrete slump is 6-8 cm; the ring beam should be cast continuously; when concrete is poured, the concrete is vibrated and compacted at the same time until laitance appears on the concrete surface;
if in sectional construction, the construction joint is reserved in the middle 1/3 span range of the ring beam span, and a reinforcing measure is provided, so that the construction joint cannot be reserved randomly or in an unforeseen way;
(9) maintaining and removing the mold: covering the straw bale after the concrete is poured, watering, moisturizing and maintaining, wherein the upper part cannot be pressed or damaged again during the maintenance period; removing the formwork after curing for 7 days, and maintaining the moisture, so that the foundation pit can be excavated after the design strength requirement is met;
(10) and (3) test block preparation: according to the requirements of the specification: concrete of same class and same label every 100M3A group of test blocks are manufactured, and the test blocks are sent to a qualified detection unit by a quality inspector under the supervision and standard maintenance for 28 days and then are tested;
(11) the tolerance of the supporting construction should meet the design requirements.
The invention has convenient construction and good construction quality.
The present invention will be further described with reference to the following examples.
Detailed Description
A pile construction method in complex environment ultra-deep foundation pit support, foundation pit support engineering mainly comprises: constructing a three-axis stirring pile and constructing a pile by an SPCW (shortest Path continuous wave) method;
(I) construction of three-axis mixing pile
(1) Obstacle clearing
Because the process requires continuous construction, underground obstacles in the enclosure construction area are detected and cleaned before construction, so that the construction is ensured to be carried out smoothly, and the number of construction cold joints is reduced;
(2) measuring line
Arranging a map according to side axis reference points and a containment plane provided by a design institute; paying out side lines and control lines of the fender posts according to the drawing size, setting a temporary control mark, making a technical review list, and submitting to supervision and acceptance;
(3) digging groove
Excavating a groove by using a 0.4m3 excavator according to the enclosing side line of the foundation pit, wherein the size of the groove is 1000 multiplied by 1000mm, removing underground obstacles, and timely treating the soil body of the excavated groove to ensure the normal construction of the triaxial mixing pile;
(4) pile driver in-place
A specially-assigned person uniformly commands the pile driver to be in place, a steel plate is laid under the pile driver, the conditions of the upper part, the lower part, the left part and the right part are clearly seen before the pile driver moves, the obstacles are found to be cleared in time, and the positioning condition is checked and corrected in time after the pile driver moves; the pile driver is stable and straight, and is observed by a theodolite or a plumb bob to ensure the verticality of the drilling machine; the pile position positioning deviation of the triaxial cement mixing pile is less than 15 mm; after pile forming, the deviation of the center of the pile must not exceed 50mm, and the deviation of the verticality of the pile body must not exceed 1/150;
(5) cement-soil mixing ratio
According to the characteristics of the triaxial mixing pile, the technical requirements of cement-soil ratio are as follows:
the mixing ratio is as follows: the water-cement ratio is 1.0-1.5; the mixing amount of 42.5-grade ordinary silicate cement is 22 percent, and the mixing amount of cement per cubic meter is 418 kg;
(6) preparation of cement slurry and slurry injection
Building a slurry mixing construction platform on a construction site, building a cement warehouse near the platform, and stirring cement slurry according to requirements before starting up; feeding the prepared cement slurry into a slurry storage barrel for later use; after the cement paste is prepared, the stagnation time is not more than 2 hours, and the construction interval of adjacent overlapped stirring piles is not more than 10 hours; during grouting, 2 pipelines of 2 grouting pumps are mixed with the Y-shaped joint from the inlet and injected;
(7) drilling stirring
Cement slurry is injected into the triaxial cement mixing pile in the sinking and lifting processes, the sinking and lifting speeds are strictly controlled, the slurry spraying sinking speed is not more than 1 m/min, the lifting speed is not more than 2.0 m/min, the mixing and grouting are repeated at the bottom of the pile, the mixture stays for about 1 minute, and the original record is made;
(8) cleaning and shifting
Adding clear water into the collecting hopper, starting a mortar pump, cleaning a mud jacking pipeline and other used machines, and then shifting to perform construction of the next pile;
(II) SPCW construction method pile construction
(1) Placing and positioning section steel
Placing two positioning section steels with the specification of 200mm multiplied by 200mm and the length of 2.5m in the direction vertical to the groove, placing two positioning section steels with the specification of 300mm multiplied by 320mm and the length of 8-20 m in the direction parallel to the groove, and positioning the tubular pile by using a section steel positioning clamp;
(2) pipe pile hoisting and inserting
Inserting the tubular pile after the construction of the mixing pile is finished, wherein the interval time is not more than 3 hours, the tubular pile is hoisted to align the position, the inserted mixing pile is stable, the driven pile is observed and adjusted by using two theodolites, the tubular pile is lowered after the position and the verticality of the driven pile are adjusted, and the tubular pile is inserted into the three-axis mixing pile body by using the self weight of the tubular pile; after the tubular pile cannot be sunk continuously due to the dead weight of the tubular pile, driving down the tubular pile by using a truck crane vibration hammer;
(3) tubular pile feeding device
(a) Pile sending is carried out by adopting a pile sending device;
(b) the pile feeder is a steel pile feeder with the same diameter as the pipe pile;
(4) tubular pile fixing
According to the elevation control point, a level gauge is used for guiding and placing the positioning section steel on the positioning section steel, according to the height difference between the positioning section steel and the elevation of the pile top, channel steel is placed on the positioning section steel, a hanging rib with the diameter of 14mm is welded to control the elevation of the pile top of the tubular pile, and the error is controlled within +/-5 cm;
after the cement-soil mixing pile reaches a certain hardening time, removing the hanging ribs and the groove positioning section steel;
(III) construction of support system
(1) Earth excavation: excavating a groove to the elevation of the bottom surface of the designed ring beam;
(2) paying off and positioning: a surveyor uses a theodolite to play the positions of the ring beam and the support according to a design drawing, requires that the error is less than 2cm, and marks the positions;
(3) after the lofting is finished, the measurer firstly submits the lofting result to a project engineer for acceptance, and after acceptance, the owner and the supervision are reported for acceptance, otherwise, the lofting is carried out again;
(4) and (4) rechecking: the owner, the supervision, inspection, acceptance and lofting results are checked, and after the results are qualified, the lofting sheets are signed for approval;
(5) chiseling floating slurry: chiseling floating slurry on the pile top of the support pile to the designed depth and width according to the design requirement, and cleaning a loose layer without fragments;
(6) binding steel bars: binding steel bars according to the reinforcement allocation requirements of a design drawing; during binding, the design and related standard requirements are met, and the geometric dimension error is less than 20 mm; the length of all the steel bars of the connecting beam anchored into the supporting beam is not less than 35d, and the thickness of the protecting layer of the supporting beam is 35 mm;
(7) erecting a mold: erecting the mold according to the designed width, length and height of the ring beam and the supporting beam; the vertical mold needs to be flat and straight, and the accurate geometric dimension and no gap are realized, and no slurry leakage is caused;
(8) pouring concrete: c35 commercial concrete is adopted for pouring the ring beam, and the concrete slump is 6-8 cm; the ring beam should be cast continuously; when concrete is poured, the concrete is vibrated and compacted at the same time until laitance appears on the concrete surface;
if in sectional construction, the construction joint is reserved in the middle 1/3 span range of the ring beam span, and a reinforcing measure is provided, so that the construction joint cannot be reserved randomly or in an unforeseen way;
(9) maintaining and removing the mold: covering the straw bale after the concrete is poured, watering, moisturizing and maintaining, wherein the upper part cannot be pressed or damaged again during the maintenance period; removing the formwork after curing for 7 days, and maintaining the moisture, so that the foundation pit can be excavated after the design strength requirement is met;
(10) and (3) test block preparation: according to the requirements of the specification: concrete of same class and same label every 100M3A group of test blocks are manufactured, and the test blocks are sent to a qualified detection unit by a quality inspector under the supervision and standard maintenance for 28 days and then are tested;
(11) the tolerance of the supporting construction should meet the design requirements.
Claims (1)
1. A pile construction method in a complex environment ultra-deep foundation pit support is characterized by comprising the following steps:
the foundation pit supporting engineering mainly comprises: constructing a three-axis stirring pile and constructing a pile by an SPCW (shortest Path continuous wave) method;
(I) construction of three-axis mixing pile
(1) Obstacle clearing
Because the process requires continuous construction, underground obstacles in the enclosure construction area are detected and cleaned before construction, so that the construction is ensured to be carried out smoothly, and the number of construction cold joints is reduced;
(2) measuring line
Arranging a map according to side axis reference points and a containment plane provided by a design institute; paying out side lines and control lines of the fender posts according to the drawing size, setting a temporary control mark, making a technical review list, and submitting to supervision and acceptance;
(3) digging groove
Excavating a groove by using a 0.4m3 excavator according to the enclosing side line of the foundation pit, wherein the size of the groove is 1000 multiplied by 1000mm, removing underground obstacles, and timely treating the soil body of the excavated groove to ensure the normal construction of the triaxial mixing pile;
(4) pile driver in-place
A specially-assigned person uniformly commands the pile driver to be in place, a steel plate is laid under the pile driver, the conditions of the upper part, the lower part, the left part and the right part are clearly seen before the pile driver moves, the obstacles are found to be cleared in time, and the positioning condition is checked and corrected in time after the pile driver moves; the pile driver is stable and straight, and is observed by a theodolite or a plumb bob to ensure the verticality of the drilling machine; the pile position positioning deviation of the triaxial cement mixing pile is less than 15 mm; after pile forming, the deviation of the center of the pile must not exceed 50mm, and the deviation of the verticality of the pile body must not exceed 1/150;
(5) cement-soil mixing ratio
According to the characteristics of the triaxial mixing pile, the technical requirements of cement-soil ratio are as follows:
the mixing ratio is as follows: the water-cement ratio is 1.0-1.5; the mixing amount of 42.5-grade ordinary silicate cement is 22 percent, and the mixing amount of cement per cubic meter is 418 kg;
(6) preparation of cement slurry and slurry injection
Building a slurry mixing construction platform on a construction site, building a cement warehouse near the platform, and stirring cement slurry according to requirements before starting up; feeding the prepared cement slurry into a slurry storage barrel for later use; after the cement paste is prepared, the stagnation time is not more than 2 hours, and the construction interval of adjacent overlapped stirring piles is not more than 10 hours; during grouting, 2 pipelines of 2 grouting pumps are mixed with the Y-shaped joint from the inlet and injected;
(7) drilling stirring
Cement slurry is injected into the triaxial cement mixing pile in the sinking and lifting processes, the sinking and lifting speeds are strictly controlled, the slurry spraying sinking speed is not more than 1 m/min, the lifting speed is not more than 2.0 m/min, the mixing and grouting are repeated at the bottom of the pile, the mixture stays for about 1 minute, and the original record is made;
(8) cleaning and shifting
Adding clear water into the collecting hopper, starting a mortar pump, cleaning a mud jacking pipeline and other used machines, and then shifting to perform construction of the next pile;
(II) SPCW construction method pile construction
(1) Placing and positioning section steel
Placing two positioning section steels with the specification of 200mm multiplied by 200mm and the length of 2.5m in the direction vertical to the groove, placing two positioning section steels with the specification of 300mm multiplied by 320mm and the length of 8-20 m in the direction parallel to the groove, and positioning the tubular pile by using a section steel positioning clamp;
(2) pipe pile hoisting and inserting
Inserting the tubular pile after the construction of the mixing pile is finished, wherein the interval time is not more than 3 hours, the tubular pile is hoisted to align the position, the inserted mixing pile is stable, the driven pile is observed and adjusted by using two theodolites, the tubular pile is lowered after the position and the verticality of the driven pile are adjusted, and the tubular pile is inserted into the three-axis mixing pile body by using the self weight of the tubular pile; after the tubular pile cannot be sunk continuously due to the dead weight of the tubular pile, driving down the tubular pile by using a truck crane vibration hammer;
(3) tubular pile feeding device
(a) Pile sending is carried out by adopting a pile sending device;
(b) the pile feeder is a steel pile feeder with the same diameter as the pipe pile;
(4) tubular pile fixing
According to the elevation control point, a level gauge is used for guiding and placing the positioning section steel on the positioning section steel, according to the height difference between the positioning section steel and the elevation of the pile top, channel steel is placed on the positioning section steel, a hanging rib with the diameter of 14mm is welded to control the elevation of the pile top of the tubular pile, and the error is controlled within +/-5 cm;
after the cement-soil mixing pile reaches a certain hardening time, removing the hanging ribs and the groove positioning section steel;
(III) construction of support system
(1) Earth excavation: excavating a groove to the elevation of the bottom surface of the designed ring beam;
(2) paying off and positioning: a surveyor uses a theodolite to play the positions of the ring beam and the support according to a design drawing, requires that the error is less than 2cm, and marks the positions;
(3) after the lofting is finished, the measurer firstly submits the lofting result to a project engineer for acceptance, and after acceptance, the owner and the supervision are reported for acceptance, otherwise, the lofting is carried out again;
(4) and (4) rechecking: the owner, the supervision, inspection, acceptance and lofting results are checked, and after the results are qualified, the lofting sheets are signed for approval;
(5) chiseling floating slurry: chiseling floating slurry on the pile top of the support pile to the designed depth and width according to the design requirement, and cleaning a loose layer without fragments;
(6) binding steel bars: binding steel bars according to the reinforcement allocation requirements of a design drawing; during binding, the design and related standard requirements are met, and the geometric dimension error is less than 20 mm; the length of all the steel bars of the connecting beam anchored into the supporting beam is not less than 35d, and the thickness of the protecting layer of the supporting beam is 35 mm;
(7) erecting a mold: erecting the mold according to the designed width, length and height of the ring beam and the supporting beam; the vertical mold needs to be flat and straight, and the accurate geometric dimension and no gap are realized, and no slurry leakage is caused;
(8) pouring concrete: c35 commercial concrete is adopted for pouring the ring beam, and the concrete slump is 6-8 cm; the ring beam should be cast continuously; when concrete is poured, the concrete is vibrated and compacted at the same time until laitance appears on the concrete surface;
if in sectional construction, the construction joint is reserved in the middle 1/3 span range of the ring beam span, and a reinforcing measure is provided, so that the construction joint cannot be reserved randomly or in an unforeseen way;
(9) maintaining and removing the mold: covering the straw bale after the concrete is poured, watering, moisturizing and maintaining, wherein the upper part cannot be pressed or damaged again during the maintenance period; removing the formwork after curing for 7 days, and maintaining the moisture, so that the foundation pit can be excavated after the design strength requirement is met;
(10) and (3) test block preparation: according to the requirements of the specification: concrete of same class and same label every 100M3A group of test blocks are manufactured, and the test blocks are sent to a qualified detection unit by a quality inspector under the supervision and standard maintenance for 28 days and then are tested;
(11) the tolerance of the supporting construction should meet the design requirements.
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|---|---|---|---|
| CN202110776516.5A CN113463655A (en) | 2021-07-09 | 2021-07-09 | Pile construction method in complex environment ultra-deep foundation pit support |
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| CN202110776516.5A CN113463655A (en) | 2021-07-09 | 2021-07-09 | Pile construction method in complex environment ultra-deep foundation pit support |
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| CN113463655A true CN113463655A (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687356A (en) * | 2022-04-15 | 2022-07-01 | 中建七局第二建筑有限公司 | Construction method for excavating deep foundation pit of building |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687356A (en) * | 2022-04-15 | 2022-07-01 | 中建七局第二建筑有限公司 | Construction method for excavating deep foundation pit of building |
| CN114687356B (en) * | 2022-04-15 | 2023-08-11 | 中建七局第二建筑有限公司 | Construction method for deep foundation pit excavation of building |
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Application publication date: 20211001 |