CN112726591A - Construction method of engineering pile shallow layer broken pile reinforcing structure and reinforcing structure thereof - Google Patents
Construction method of engineering pile shallow layer broken pile reinforcing structure and reinforcing structure thereof Download PDFInfo
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- CN112726591A CN112726591A CN202110016546.6A CN202110016546A CN112726591A CN 112726591 A CN112726591 A CN 112726591A CN 202110016546 A CN202110016546 A CN 202110016546A CN 112726591 A CN112726591 A CN 112726591A
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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
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Abstract
The invention discloses a construction method of a shallow pile-breaking reinforced structure of an engineering pile and a reinforced structure thereof, which comprises the following steps of drilling a hole in an area surrounded by stirrups of the engineering pile, and drilling the hole to a position below a broken joint of the engineering pile; placing a prefabricated engineering pile shallow layer broken pile reinforcing structure in the excavation hole; the bottom of the project pile shallow broken pile reinforcing structure is positioned below a broken joint, and the top of the project pile shallow broken pile reinforcing structure is positioned above the broken joint; pouring concrete with the strength higher than the original broken pile strength to the elevation of the pile top to finish the broken pile reinforcement; the construction method for shallow broken pile reinforcement of the engineering pile is characterized in that the excavation hole is formed in the pile core of the engineering pile, the shallow broken pile reinforcement structure of the engineering pile is placed in the excavation hole, the bottom of the shallow broken pile reinforcement structure is ensured to be below a broken joint, the top of the shallow broken pile reinforcement structure is ensured to be above the broken joint, connection reinforcement of pile foundation concrete at the upper part and the lower part of the broken joint is realized, and the high strength characteristic and the shearing resistance of the shallow broken pile reinforcement structure of the engineering pile are utilized, so that the integrally repaired pile foundation has better pile foundation compression resistance and shearing resistance.
Description
Technical Field
The invention relates to the technical field of pile foundation engineering, in particular to a construction method of a shallow pile-breaking reinforced structure of an engineering pile and a reinforced structure thereof.
Background
With the rapid development of urban construction, pile foundations are increasingly applied to foundation treatment engineering, and when a cast-in-place concrete pile foundation is constructed in a complex stratum, shearing force is generated on a soil layer interface due to too large difference of mechanical parameters of adjacent strata, so that pile foundation concrete which is not cured to the designed strength is cracked, and even a through crack is formed. When the cast-in-place pile is constructed by adopting a pipe sinking method for hole forming in a high water level stratum, underground water is possibly clamped in the concrete due to the fact that a guide pipe is pulled up too fast in the process of pouring the concrete underwater to form an interface, and cracks are formed after the concrete is hardened. The existence of pile body cracks in the pile foundation can obviously reduce the shearing resistance bearing capacity and the bending resistance bearing capacity of the engineering pile, and brings serious potential safety hazards to the engineering.
The treatment of the broken pile of the engineering pile is a technical problem, and for the treatment of the crack formed by the broken pile of the shallow layer, the simple excavation of the soil around the pile is often adopted, the pile body concrete on the crack is broken, and the pile body concrete is poured again. For a pile foundation with relatively dense pile spacing, an excavated pile surrounding soil space is not provided, and even if the excavated pile surrounding soil condition is provided, excavation and backfilling of the pile surrounding soil can seriously disturb foundation soil, so that the bearing capacity of the foundation soil is not restored. For example, in a pile-in-pile broken-pile and pile-splicing construction method disclosed as CN111877329A and a bored pile broken-pile and pile-splicing structure and method disclosed as CN110438986A, broken-bar connection and re-pouring and a method of bar-planting grouting are adopted, which often cause the problems of reduced broken-pile bearing capacity and poor shearing resistance after treatment, so that the scheme is developed for seeking to develop a treatment method which is simple and convenient to construct, can effectively treat cracks of a shallow broken pile and improve the shearing resistance and bending resistance of an engineering pile.
Disclosure of Invention
The invention aims to provide a construction method of a shallow-layer broken pile reinforcing structure of an engineering pile and a reinforcing structure thereof, and the purpose of improving the shearing bearing capacity and the bending bearing capacity of the engineering pile is achieved.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a construction method for reinforcing a shallow broken pile of an engineering pile, which comprises the following steps:
drilling a hole in an area surrounded by the engineering pile stirrups until the hole is below the position of the broken joint of the engineering pile;
placing a prefabricated engineering pile shallow layer broken pile reinforcing structure in the excavation hole;
the bottom of the project pile shallow layer broken pile reinforcing structure is positioned below a broken joint, and the top of the project pile shallow layer broken pile reinforcing structure is positioned above the broken joint;
and pouring concrete with the strength higher than that of the original broken pile to the elevation of the pile top, and then finishing the reinforcement of the broken pile.
Preferably, after the excavation of the excavation hole is finished, the excavation hole is cleaned by an air compressor.
Preferably, the concrete in the excavated hole is removed by adopting a mechanical drilling machine.
Preferably, the top and the bottom of the engineering pile shallow broken pile reinforcing structure are the same in height from the broken joint.
Preferably, the central axis of the engineering pile shallow layer broken pile reinforcing structure coincides with the central axis of the excavated hole.
Preferably, when the concrete in the excavation hole is poured, a vibrating rod is adopted for vibrating.
The invention also provides a shallow pile-breaking reinforcing structure for the engineering pile, which comprises a reinforcing part, a first longitudinal rib and a first stirrup, wherein the reinforcing part is provided with a plurality of longitudinally crossed supporting plates, the first stirrup sequentially and transversely penetrates through the plurality of supporting plates to form a closed structure, and the first longitudinal rib is longitudinally arranged on the inner side of the first stirrup and is connected with the first stirrup.
Preferably, a plurality of the support plates jointly intersect the longitudinal central axis of the support plate.
Preferably, a reinforcing plate is installed at a longitudinal end of the plurality of support plates, and a longitudinal length of the reinforcing plate is the same as that of the support plates.
Preferably, the shape of the first stirrup closure is circular or square.
Compared with the prior art, the invention has the following technical effects:
1. the construction method for shallow broken pile reinforcement of the engineering pile is characterized in that the excavation hole is formed in the pile core of the engineering pile, the shallow broken pile reinforcement structure of the engineering pile is placed in the excavation hole, the bottom of the shallow broken pile reinforcement structure is ensured to be below a broken joint, the top of the shallow broken pile reinforcement structure is ensured to be above the broken joint, connection reinforcement of pile foundation concrete at the upper part and the lower part of the broken joint in the excavation hole is realized, and the high strength characteristic and the shearing resistance of the shallow broken pile reinforcement structure of the engineering pile are utilized, so that the integrally repaired pile foundation has better pile foundation pressure resistance and shearing resistance.
2. The top and the bottom of the shallow broken pile reinforcing structure of the engineering pile are the same in height from the broken joint, namely the broken joint section is located in the middle of the shallow broken pile reinforcing structure of the engineering pile, when the broken joint bears bending moment or shearing force, the broken joint section is transmitted to the middle of the shallow broken pile reinforcing structure of the engineering pile in the excavation hole, the shallow broken pile reinforcing structure of the engineering pile has a bending or twisting trend in the middle of the shallow broken pile reinforcing structure of the engineering pile regardless of the bending moment or the shearing force, and the twisting or bending trends at two ends of the shallow broken pile reinforcing structure of the engineering pile are symmetrical, so that the secondary disturbance of the broken joint located in the middle is avoided, the protection effect on the broken joint structure is achieved, and the stability of the whole structure of the engineering pile is improved in a phase-changing manner.
3. The central axis of the engineering pile shallow layer broken pile reinforcing structure is superposed with the central axis of the excavated hole, namely the engineering pile shallow layer broken pile reinforcing structure is positioned in the middle of the excavated hole and is equivalent to the arrangement uniformity of the reinforcement structure of the small pile foundation formed by the excavated hole to be poured, so that the protective layer of the small pile foundation is uniform and stable, and the stability of the small pile foundation structure formed by the excavated hole to be poured is further ensured.
4. According to the invention, the concrete in the excavation hole is removed by adopting a mechanical drilling machine chiseling mode, and when the mechanical drilling machine chisels the concrete in the excavation hole, chiseling can be naturally completed on the inner wall and the bottom of the excavation hole, so that the process of independently processing the chiseling on the inner wall and the bottom of the excavation hole is omitted, and the construction is convenient and rapid.
Drawings
In order to more clearly illustrate the present invention or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a longitudinal section of an engineering pile;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
1, shallow pile breaking and reinforcing structure of the engineering pile; 2. digging a hole; 3. engineering piles; 4. a first stirrup; 5. a second stirrup; 6. breaking the seam; 7. a second longitudinal rib; 8. a first longitudinal rib; 9. a third stirrup; 10. a support plate; 11. a reinforcing plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a construction method of a shallow pile-breaking reinforced structure of an engineering pile and a reinforced structure thereof, which comprises the following steps of drilling a hole in an area surrounded by stirrups of the engineering pile, and drilling the hole to a position below a broken joint of the engineering pile; placing a prefabricated engineering pile shallow layer broken pile reinforcing structure in the excavation hole; the bottom of the project pile shallow broken pile reinforcing structure is positioned below a broken joint, and the top of the project pile shallow broken pile reinforcing structure is positioned above the broken joint; pouring concrete with the strength higher than that of the original broken pile to the elevation of the pile top, and then completing the broken pile reinforcement; the construction method for shallow broken pile reinforcement of the engineering pile is characterized in that the excavation hole is formed in the pile core of the engineering pile, the shallow broken pile reinforcement structure of the engineering pile is placed in the excavation hole, the bottom of the shallow broken pile reinforcement structure is ensured to be below a broken joint, the top of the shallow broken pile reinforcement structure is ensured to be above the broken joint, connection reinforcement of pile foundation concrete at the upper part and the lower part of the broken joint is realized, and the high strength characteristic and the shearing resistance of the shallow broken pile reinforcement structure of the engineering pile are utilized, so that the integrally repaired pile foundation has better pile foundation pressure resistance and shearing resistance.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a construction method of a shallow pile-breaking reinforcing structure of an engineering pile includes the following steps of drilling a hole in an area surrounded by stirrups of an engineering pile 3, and drilling the hole to a position below a broken joint 6 of the engineering pile 3; placing the prefabricated engineering pile shallow layer broken pile reinforcing structure 1 in the excavation hole 2; the bottom of the shallow broken pile reinforcing structure 1 of the engineering pile 3 is positioned below the broken joint 6, and the top of the shallow broken pile reinforcing structure is positioned above the broken joint 6; pouring concrete with the strength higher than that of the original broken pile to the elevation of the pile top, and then completing the broken pile reinforcement; the construction method of the shallow broken pile reinforcing structure of the engineering pile is characterized in that the excavation hole 2 is formed in the pile core of the engineering pile 3, the shallow broken pile reinforcing structure 1 of the engineering pile is placed in the construction hole, the bottom of the shallow broken pile reinforcing structure is ensured to be below the broken joint 6, the top of the shallow broken pile reinforcing structure is ensured to be above the broken joint 6, the connection and reinforcement of pile foundation concrete at the upper part and the lower part of the broken joint 6 are realized, and the high strength characteristic and the shearing resistance of the shallow broken pile reinforcing structure 1 of the engineering pile are utilized, so that the integrally repaired pile foundation has better pile foundation pressure resistance and shearing resistance.
Referring to fig. 1, after the excavation of the excavation hole 2 is finished, the excavation hole 2 is cleaned by using an air compressor, a large amount of concrete fragments which are inevitably left in the excavation hole 2 mainly exist at the corners of the excavation hole 2 and are not easy to take out in the drilling process, and the concrete fragments left at the corners can be quickly washed out by using the air compressor, so that the interior of the excavation hole 2 is clean and has concrete pouring conditions.
Furthermore, the concrete in the excavation hole 2 is removed by adopting a mechanical drilling machine chiseling mode, when the mechanical drilling machine chisels the concrete in the excavation hole 2, chiseling can be naturally completed on the inner wall and the bottom of the excavation hole 2, and the process of independently processing the chiseling on the inner wall and the bottom of the excavation hole 2 is omitted, so that the construction is convenient and rapid.
Referring to fig. 1, the top and the bottom of the shallow broken pile reinforcing structure 1 of the engineering pile have the same height from the broken joint 6, that is, the cross section of the broken joint 6 is located in the middle of the shallow broken pile reinforcing structure 1 of the engineering pile, and when the broken joint 6 bears bending moment or shearing force, the bending moment or shearing force is transmitted to the middle of the shallow broken pile reinforcing structure 1 of the engineering pile in the excavation hole 2, so that the shallow broken pile reinforcing structure 1 of the engineering pile has a bending or twisting tendency in the middle of the shallow broken pile reinforcing structure 1, and the twisting or bending tendency of the two ends of the shallow broken pile reinforcing structure 1 of the engineering pile is symmetrical, thereby avoiding re-disturbance to the broken joint 6 located in the middle, protecting the structure of the broken joint 6, and increasing the stability of the whole structure of the engineering pile 3.
Referring to fig. 1-3, the central axis of the engineering pile shallow layer broken pile reinforcing structure 1 coincides with the central axis of the excavation hole 2, that is, the engineering pile shallow layer broken pile reinforcing structure 1 is located in the middle of the excavation hole 2, that is, the arrangement uniformity of the reinforcement structure of the internal small pile foundation formed by the excavation hole 2 to be poured is equivalent to the arrangement uniformity of the reinforcement structure of the internal small pile foundation formed by the excavation hole 2 to be poured, so that the protective layer of the small pile foundation is uniform and stable, and the stability of the internal small pile foundation structure formed by the excavation hole 2 to be poured is further ensured.
Furthermore, when the concrete in the excavation hole 2 is poured, a vibrating rod is adopted for vibrating, so that the concrete is compacted and combined, the phenomena of honeycomb pitted surface and the like of the concrete are eliminated, and the strength and the forming quality of the concrete are improved.
Referring to fig. 1-3, an engineering pile shallow layer broken pile reinforcing structure comprises a reinforcing part, a plurality of first longitudinal ribs 8 and a plurality of first stirrups 4, wherein the reinforcing part is a plurality of longitudinally crossed supporting plates 10, the first stirrups 4 sequentially and transversely penetrate through the supporting plates 10 to form a closed figure, each first stirrup 4 is arranged on the reinforcing part from top to bottom according to a fixed interval, the plurality of first longitudinal ribs 8 are longitudinally arranged on the inner sides of the first stirrups 4 and connected with the plurality of first stirrups 4, the engineering pile shallow layer broken pile reinforcing structure 1 is formed by combining and processing the supporting plates 10 and reinforcing steel bars, the shearing resistance and bending resistance of the engineering pile shallow layer broken pile reinforcing structure 1 can be enhanced, the bending resistance and shearing resistance of a pile foundation after reinforcing are enhanced, and further, the first longitudinal ribs 8 in the engineering pile shallow layer broken pile reinforcing structure 1 extend out of the supporting plates 10 to the pile top, and extend the length of backup pad 10 at first vertical muscle 8 and ligature third stirrup 9 to the pile bolck within range, third stirrup 9 adopts the spiral stirrup and upwards ligature to the pile bolck according to fixed pitch, has strengthened the support strength of engineering stake shallow broken pile reinforced structure 1 at pile bolck within range reinforcing bar in other words, improves the resistance to compression bearing capacity at pile body top by a wide margin.
Referring to fig. 3, the plurality of supporting plates 10 are intersected with the longitudinal central axis of the supporting plates 10 together, so that the centers of gravity of all the supporting plates 10 are concentrated on a straight line, and the centers of gravity are located at the center of the engineering pile shallow pile breaking reinforcing structure 1, therefore, the engineering pile shallow pile breaking reinforcing structure 1 has extremely strong stability, when being placed in an excavation hole 2, the engineering pile shallow pile breaking reinforcing structure can stably exist in the excavation hole 2, when some unavoidable collisions occur, the engineering pile shallow pile breaking reinforcing structure is not easy to topple over, further, angles formed by all the adjacent supporting plates 10 are the same, and when the first longitudinal bars 8 are arranged, the first longitudinal bars 8 can be more uniform and arranged according to a certain interval, thereby effectively improving the rationality and stability of the steel bar framework structure, and avoiding that when the first longitudinal bars 8 are arranged according to a fixed interval, the intervals of the supporting plates 10 cannot be adjusted, so that all the first stirrups 4 are arranged unevenly, uneven stress and further influence the strength reduction of subsequent pouring structures.
Referring to fig. 3, the stiffening plate 11 is installed to the vertical tip of a plurality of backup pads 10, the longitudinal length of stiffening plate 11 is the same with the length of backup pad 10, stiffening plate 11 has strengthened the bulk strength of engineering stake shallow layer broken pile reinforced structure 1 on the one hand, on the other hand, the longitudinal length of stiffening plate 11 is the same with the length of backup pad 10, the bottom area of engineering stake shallow layer broken pile reinforced structure 1 has been increased in other words, be more favorable to the stability of engineering stake shallow layer broken pile reinforced structure 1, the anti-overturning property, furthermore, the material of stiffening plate 11 is the same with the material of backup pad 10, thereby reach the purpose that reduces stress concentration, guarantee the even stability of structure atress.
Referring to fig. 3, the closed shape of first stirrup 4 is circular or square, more is applicable to the first vertical muscle 8 of reasonable even arrangement, guarantees the rationality and the stability of steel reinforcement skeleton structure.
The invention discloses a construction method of a shallow pile-breaking reinforcing structure of an engineering pile, which comprises the following steps:
example 1
Firstly, a mechanical drilling machine is selected to drill a hole in a region surrounded by stirrups of an engineering pile 3, and the hole is drilled below a position of a broken joint 6 of the engineering pile 3 to form an excavated hole; secondly, cleaning residual concrete fragments in the excavation hole by using an air compressor, after cleaning, placing the bottom of the prefabricated engineering pile shallow broken pile reinforcing structure 1 at the bottom of the excavation hole 2, and enabling the top of the engineering pile shallow broken pile reinforcing structure 1 to be positioned above a broken joint 6; and finally, pouring concrete with the strength higher than that of the original broken pile, and vibrating while pouring until the pile top is elevated, so that the broken pile reinforcement is completed.
Example 2
Firstly, a mechanical drilling machine is selected to drill a hole in a region surrounded by stirrups of an engineering pile 3, and the hole is drilled below a position of a broken joint 6 of the engineering pile 3 to form an excavated hole; secondly, cleaning residual concrete fragments in the excavation hole by using an air compressor, hoisting the prefabricated engineering pile shallow broken pile reinforcing structure 1 into the excavation hole 2 by using a crane after cleaning, and keeping the bottom of the engineering pile shallow broken pile reinforcing structure 1 below a broken joint 6 and the top of the engineering pile shallow broken pile reinforcing structure above the broken joint 6; and finally, pouring concrete with the strength higher than that of the original broken pile, vibrating the concrete to the top of the engineering pile shallow-layer broken pile reinforcing structure 1 while pouring, unlocking the lifting hook after the concrete strength reaches the standard, and continuously pouring the concrete to the elevation of the pile top, so that the broken pile reinforcement is completed.
The adaptation according to the actual needs is within the scope of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A construction method for reinforcing a shallow broken pile of an engineering pile is characterized by comprising the following steps:
drilling a hole in an area surrounded by the engineering pile stirrups until the hole is below the position of the broken joint of the engineering pile;
placing a prefabricated engineering pile shallow layer broken pile reinforcing structure in the excavation hole;
the bottom of the project pile shallow layer broken pile reinforcing structure is positioned below a broken joint, and the top of the project pile shallow layer broken pile reinforcing structure is positioned above the broken joint;
and pouring concrete with the strength higher than that of the original broken pile to the elevation of the pile top, and then finishing the reinforcement of the broken pile.
2. The construction method for shallow broken pile reinforcement of the engineering pile according to claim 1, wherein after the excavation of the excavation hole is finished, the excavation hole is cleaned by an air compressor.
3. The construction method for shallow broken pile reinforcement of the engineering pile as claimed in claim 2, wherein concrete in the excavated hole is removed by a mechanical drilling machine.
4. The construction method for shallow pile-segment reinforcement of the engineering pile according to claim 2 or 3, wherein the top and the bottom of the shallow pile-segment reinforcement structure of the engineering pile are at the same height from the fracture.
5. The construction method for shallow pile-segment reinforcement of the engineering pile according to claim 1 or 3, wherein the central axis of the shallow pile-segment reinforcement structure of the engineering pile coincides with the central axis of the excavated hole.
6. The construction method for reinforcing a shallow broken pile of an engineering pile according to claim 5, wherein a vibrating rod is used for vibrating when concrete in the excavated hole is poured.
7. The utility model provides an engineering stake shallow layer broken pile reinforced structure, its characterized in that includes rib, first muscle and the first stirrup of indulging, the rib is the vertical criss-cross backup pad of polylith, first stirrup transversely passes in proper order a plurality ofly the backup pad forms the closure, first muscle longitudinal arrangement of indulging is in first stirrup is inboard, and with first stirrup is connected.
8. The shallow pile-breaking reinforcement structure for the engineering pile according to claim 7, wherein a plurality of the support plates are commonly crossed with the longitudinal central axes of the support plates.
9. The shallow pile-breaking reinforcing structure for the engineering pile according to claim 8, wherein a plurality of reinforcing plates are installed at longitudinal ends of the supporting plates, and the longitudinal length of each reinforcing plate is the same as that of each supporting plate.
10. An engineering pile shallow pile-breaking reinforcing structure as claimed in claim 7, wherein the shape of the first stirrup closure is circular or square.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110016546.6A CN112726591A (en) | 2021-01-07 | 2021-01-07 | Construction method of engineering pile shallow layer broken pile reinforcing structure and reinforcing structure thereof |
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| CN202110016546.6A CN112726591A (en) | 2021-01-07 | 2021-01-07 | Construction method of engineering pile shallow layer broken pile reinforcing structure and reinforcing structure thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293759A (en) * | 2021-06-30 | 2021-08-24 | 西南交通大学 | Implanted steel pipe concrete reinforcing method for concrete filling pile broken pile |
| CN113653110A (en) * | 2021-09-03 | 2021-11-16 | 耀华建设管理有限公司 | Engineering pile shallow layer broken pile reinforcing structure and construction method thereof |
-
2021
- 2021-01-07 CN CN202110016546.6A patent/CN112726591A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293759A (en) * | 2021-06-30 | 2021-08-24 | 西南交通大学 | Implanted steel pipe concrete reinforcing method for concrete filling pile broken pile |
| CN113653110A (en) * | 2021-09-03 | 2021-11-16 | 耀华建设管理有限公司 | Engineering pile shallow layer broken pile reinforcing structure and construction method thereof |
| CN113653110B (en) * | 2021-09-03 | 2023-01-06 | 耀华建设管理有限公司 | Engineering pile shallow layer broken pile reinforcing structure and construction method thereof |
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