CN113356254A - Connecting device for pile top and bearing platform of PHC (prestressed high-strength concrete) pipe pile and construction method of connecting device - Google Patents
Connecting device for pile top and bearing platform of PHC (prestressed high-strength concrete) pipe pile and construction method of connecting device Download PDFInfo
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- CN113356254A CN113356254A CN202110658262.7A CN202110658262A CN113356254A CN 113356254 A CN113356254 A CN 113356254A CN 202110658262 A CN202110658262 A CN 202110658262A CN 113356254 A CN113356254 A CN 113356254A
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000011372 high-strength concrete Substances 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 132
- 239000010959 steel Substances 0.000 claims abstract description 132
- 238000004873 anchoring Methods 0.000 claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of building construction, in particular to a connecting device for a PHC tubular pile top and a bearing platform and a construction method thereof, wherein the connecting device comprises a connecting structure, core filling concrete and a pile top steel plate, the connecting structure comprises an upper supporting plate, a lower supporting plate, an external thread steel pipe, a nut, a fixed reinforcing steel bar and an anchoring reinforcing steel bar, the distance between the upper supporting plate and the tubular pile top is adjusted by arranging the two upper supporting plates with different sizes so as to realize better connecting performance of the tubular pile and the bearing platform, and the whole connecting structure is fixed by arranging the fixed reinforcing steel bar, so that the stress performance and the connectivity of the PHC tubular pile and the bearing platform are improved, the construction quality and the construction efficiency are improved, and the full utilization of materials is facilitated; the device and the method have strong universality, can realize industrial mass production, have high construction speed and have good applicability for overcoming the connection height difference of the bearing platform and the tubular pile.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a connecting device for a PHC pipe pile top and a bearing platform and a construction method thereof.
Background
With the continuous acceleration of urban construction and the urbanization rate of China, the construction of urban infrastructure develops rapidly. The prestressed PHC pipe pile has high bearing capacity, and the advantage of realizing rapid construction is accepted by more and more same lines. The following are found in the construction process: the connection effect of the PHC tubular pile and the upper structure bearing platform is not particularly ideal, the defects of the stress performance and the bearing capacity of the connection part of the PHC tubular pile and the bearing platform are easy to occur in the construction, and concrete segregation is easy to occur at the core filling part of the tubular pile to influence the stress performance and the connection performance.
The traditional treatment means is that a supporting plate is arranged in the PHC tubular pile, steel bars are welded on the upper portion of the PHC tubular pile, and a bearing platform is constructed after core filling. The method causes the concrete in the pipe pile to seep, the segregation occurs, and the concrete pouring quality is reduced; the length of the steel bar extending into the PHC tubular pile and the length of the steel bar extending into the bearing platform are not considered, so that the steel bar is wasted or insufficient, the connection effect is poor, and the performance is poor; these are undesirable to those skilled in the art.
Disclosure of Invention
Aiming at the existing problems, the invention discloses a connecting device of a PHC tubular pile top and a bearing platform and a construction method thereof, which solve the problems that the connecting device of the PHC tubular pile top and the bearing platform in the prior art is insufficient in stress performance, is easy to have construction quality problems, and further influences the construction integrity and the stress performance of a PHC tubular pile.
A connecting device of PHC tubular pile top and cushion cap includes: connecting structures, core filling concrete and pile top steel plates;
the pile top steel plate is fixed on the pile top of the PHC tubular pile;
the connecting structure comprises an upper supporting plate, a lower supporting plate, an external thread steel pipe, a screw cap, a fixed steel bar and an anchoring steel bar; the upper supporting plate is sleeved on the external thread steel pipe, the nuts are sleeved on the external thread steel pipe above and below the upper supporting plate, the upper supporting plate is fixed through the nuts, the lower supporting plate is welded at the bottom of the external thread steel pipe, the edge of the lower supporting plate is provided with a rubber ring, the fixed steel bar is fixed at the top of the external thread steel pipe, the anchoring steel bar is fixed on the upper supporting plate, and a stirrup is bound on the anchoring steel bar;
the fixed reinforcing bar is fixed on the pile top steel plate, the part of connection structure below being located the fixed reinforcing bar set up in the PHC tubular pile, fill out the core concrete set up in the PHC tubular pile.
Preferably, the anchoring bar has a flared structure with a large upper part and a small lower part above the fixing bar.
Preferably, the fixed steel bar comprises two plain steel bars, and the fixed steel bar is welded on the external thread steel pipe and the pile top steel plate.
Preferably, the diameter of bottom plate is greater than the diameter of upper plate and is less than the internal diameter of PHC tubular pile, just the internal diameter of PHC tubular pile with the difference of the diameter of bottom plate is 2.5 ~ 3.5 mm.
Preferably, the anchoring reinforcing steel bars are thread reinforcing steel bars, and the anchoring reinforcing steel bars are uniformly arranged on the outer circumference of the upper supporting plate.
Preferably, the rubber ring is a U-shaped rubber ring.
Preferably, the nut is a hexagonal nut.
Preferably, the upper supporting plate is provided with through holes arranged in a plum blossom shape.
Preferably, the upper supporting plate and the lower supporting plate are both steel plates.
The invention also discloses a construction method of the connecting device for the pile top and the bearing platform of the PHC tubular pile, which is characterized by comprising the following steps: the method comprises the following steps:
step S1, placing the prefabricated steel pipe on a threading machine for thread engraving to form the external thread steel pipe;
step S2, processing a steel plate to form the upper supporting plate and the lower supporting plate, respectively sleeving the upper supporting plate and two nuts on the external thread steel pipe, positioning the upper supporting plate between the two nuts, fixing the lower supporting plate at the bottom end of the external thread steel plate, and sleeving a rubber ring on the edge of the lower supporting plate;
step S3, welding anchoring steel bars on the upper supporting plate, and binding stirrups on the anchoring steel bars;
step S4, welding the fixed steel bars to the top of the external thread steel pipe, wherein the upper supporting plate, the lower supporting plate, the external thread steel pipe, the screw cap, the fixed steel bars and the anchoring steel bars form the connecting structure together;
step S5, placing the connecting structure into a PHC tubular pile, and welding the fixed steel bars on the pile top steel plate;
and step S6, pouring core filling concrete in the PHC pipe pile.
Compared with the prior art, the invention has the following advantages or beneficial effects:
the lower supporting plate with the rubber ring arranged on the outer edge is used for preventing the bottom of the core filling concrete from leaking slurry, so that the construction quality is guaranteed.
Secondly, through setting up fixed steel bar, realize that the elevation of whole device is controllable, and then increased the steadiness of structure.
And thirdly, the upper supporting plate can move up and down by arranging the threads on the steel pipe, so that the effective utilization of the fixed steel bars is realized, and the utilization rate of the steel bars is improved.
The connecting device can ensure the construction quality, can be adjusted according to the bending moment and the shearing force, can greatly improve the construction efficiency, and can be processed and manufactured by using engineering excess materials, thereby saving the construction cost.
Drawings
Fig. 1 is a schematic structural view of a connecting device for a pile top and a bearing platform of a PHC pile in an embodiment of the present invention;
FIG. 2 is a cross-sectional view at AA in FIG. 1;
wherein, 1 is a fixed steel bar; 2 is an upper supporting plate; 3 is a lower supporting plate; 4 is a steel pipe; 5 is filled concrete; 6 is an anchoring steel bar; 7 is a stirrup; 8 is a rubber ring; 9 is a screw cap; and 10 is a pile top steel 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 first embodiment is as follows:
as shown in fig. 1 and 2, the invention discloses a connecting device for a pile top and a bearing platform of a PHC pipe pile, which specifically comprises a connecting structure, core filling concrete 5 and a pile top steel plate 10; the pile top steel plate 10 is fixed on the top of the PHC tubular pile; the connecting structure comprises an upper supporting plate 2, a lower supporting plate 3, an external thread steel pipe 4 (namely, a steel pipe with threads arranged outside), a screw cap 9, a fixed steel bar and an anchoring steel bar 6; the upper supporting plate 2 is sleeved on the external thread steel pipe 4, the external thread steel pipe 4 is sleeved with nuts 9 above and below the upper supporting plate 2, so that the upper supporting plate 2 is fixed through the two nuts 9, the lower supporting plate 3 is welded at the bottom of the external thread steel pipe 4, the edge of the lower supporting plate 3 is provided with a rubber ring 8, the fixed steel bar is fixed at the top of the external thread steel pipe 4, the anchoring steel bar 6 is fixed on the upper supporting plate 2, and the anchoring steel bar 6 is bound with a stirrup 7; the fixed steel bar is fixed on the pile top steel plate 10, and the part of the connecting structure below the fixed steel bar is arranged in the PHC tubular pile; the core-filled concrete 5 is arranged in the PHC pipe pile.
Specifically, the external threaded steel pipe 4 is formed by cutting a steel pipe with a diameter of 100mm, specifically, the cut steel pipe is placed in a threading machine for thread cutting, and the threads are distributed on the whole steel pipe.
In a preferred embodiment of the present invention, the anchoring bar 6 has a flared structure with a large upper part and a small lower part above the fixing bar.
In a preferred embodiment of the present invention, the fixing bars include two plain round bars, and the fixing bars are welded to the externally threaded steel pipe 4 and the pile top steel plate 10, and specifically, the fixing bars include two 22mm diameter hpb 400-grade bars.
In a preferred embodiment of the present invention, the diameter of the lower supporting plate 3 is greater than the diameter of the upper supporting plate 2 and less than the inner diameter of the PHC pile, and the difference between the inner diameter of the PHC pile and the diameter of the lower supporting plate is 2.5-3.5 mm (e.g., 2.5mm, 3mm, 3.2mm, or 3.5 mm); specifically, the upper supporting plate 2 and the lower supporting plate 3 are formed by cutting steel plates with diameters of 220mm and 300mm and thicknesses of 4mm, the diameter of an opening at the circle center of the upper supporting plate 2 is 100mm, and the upper supporting plate 2 is screwed and fixed by a pair of nuts 9.
In a preferred embodiment of the present invention, the anchoring steel bars 6 are thread steel bars, and the anchoring steel bars 6 are uniformly arranged on the outer circumference of the upper supporting plate 2, specifically, according to the drawing and the actual construction requirements, steel bars directly of 22mm hrb400 grade are selected as the anchoring steel bars 6 and uniformly arranged on the upper supporting plate 2.
In a preferred embodiment of the present invention, the rubber ring 8 is a U-shaped rubber ring, so as to be sleeved on the lower supporting plate 3, specifically, the U-shaped rubber ring is sleeved on the edge of the lower supporting plate 3, and when the core filling concrete 5 is poured into the device, the quality problems such as segregation and bleeding of the concrete are avoided.
In a preferred embodiment of the present invention, the nut 9 is a hexagonal nut, and specifically, a pair of hexagonal nuts with an inner diameter of 100mm is selected to be screwed into the steel pipe for adjusting and fixing the position of the upper supporting plate 2.
In a preferred embodiment of the present invention, the upper supporting plate 2 is provided with a through hole arranged in a plum blossom shape.
In a preferred embodiment of the present invention, the core concrete 5 is dry hard small gravel concrete, and specifically, after the inner wall of the device is cleaned, No. 50 dry hard small gravel concrete is poured, and the device is vibrated to be dense.
Example two:
the invention also discloses a construction method of the connecting device of the pile top of the PHC tubular pile and the bearing platform, which is based on the connecting device of the pile top of the PHC tubular pile and the bearing platform in the first embodiment, and specifically comprises the following steps:
step S1, placing the prefabricated steel pipe on a threading machine for thread engraving to form an external thread steel pipe; specifically, a steel pipe with a diameter of 100mm is cut into segments with a length of 2m in a factory, and then the processed steel pipe is placed on a threading machine to be subjected to thread engraving to form the externally threaded steel pipe;
step S2, an upper supporting plate and a lower supporting plate are formed by processing a steel plate, the upper supporting plate and two nuts are respectively sleeved on the external thread steel pipe, the upper supporting plate is positioned between the two nuts, the lower supporting plate is fixed at the bottom end of the external thread steel plate, and a rubber ring is sleeved on the edge of the lower supporting plate;
specifically, it is 220mm upper plate 2 to process the diameter with the steel sheet, diameter 300 mm's bottom plate, layer board thickness 4mm, the upper plate is fixed through screw thread and two nuts of arranging on the external screw thread steel pipe, this upper plate is 0.6m apart from the distance of pile top, in order to ensure that the device has sufficient anchor length, this bottom plate and external screw thread steel pipe welding, and sheathe the U-shaped rubber circle along the circumference at the bottom plate edge, the bottom plate external diameter of sheaing in the rubber circle is 310mm, 3mm less than the PHC tubular pile internal diameter, in order to ensure that this connection structure can put into the PHC tubular pile downtheholely.
And step S3, welding anchoring steel bars on the upper supporting plate, and binding stirrups on the anchoring steel bars. Specifically, weld a plurality of anchor reinforcing bars on the layer board one by one, follow-up outside reinforcing bar that stretches out the PHC tubular pile bends according to actual conditions and makes tubaeform (the part of above-mentioned anchor reinforcing bar above the fixed reinforcing bar is big-end-up's tubaeform structure) to even interval ligature several rings of stirrup on the anchor reinforcing bar, this anchor reinforcing bar diameter 22mm, stirrup diameter 10 mm.
Step S4, welding fixed steel bars on the top of the external thread steel pipe (namely welding 2 fixed steel bars on the top of the external thread steel pipe in parallel), and forming a connecting structure by the upper supporting plate, the lower supporting plate, the external thread steel pipe, the screw cap, the fixed steel bars and the anchoring steel bars;
and step S5, placing the connecting structure into the PHC tubular pile, and welding the fixed steel bars on a pile top steel plate.
Specifically, with inside down putting into the PHC tubular pile from the top of above-mentioned connection structure, weld the tip of 2 fixed reinforcing bars on the steel sheet at PHC tubular pile top to guarantee the steadiness of whole device.
And step S6, pouring core filling concrete in the PHC pipe pile.
Specifically, after the position of the connecting structure is located and retested, the pile core and the steel tube core filling concrete are poured, the vibrating rod is used for vibrating and compacting, watering and maintenance are carried out after final setting, and the reinforcing steel bars of the connecting structure extending into the bearing platform part are cross-bound when the bearing platform reinforcing steel bars are installed, so that the PHC pipe pile and the bearing platform are effectively connected.
In summary, the invention aims to design a connecting device for a pile top of a PHC tubular pile and a bearing platform and a construction method thereof, wherein two upper and lower supporting plates with different sizes are arranged, the distance between the upper supporting plate and the pile top of the tubular pile is adjusted to realize better connecting performance of the tubular pile and the bearing platform, and the whole connecting structure is fixed by arranging a fixing steel bar, so that the stress performance and the connectivity of the PHC tubular pile and the bearing platform are improved, the construction quality and the construction efficiency are improved, and the full utilization of materials is facilitated. The device and the method have strong universality, can realize industrial mass production, have high construction speed and have good applicability for overcoming the connection height difference of the bearing platform and the tubular pile.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a connecting device of PHC tubular pile top and cushion cap which characterized in that includes: connecting structures, core filling concrete and pile top steel plates;
the pile top steel plate is fixed on the pile top of the PHC tubular pile;
the connecting structure comprises an upper supporting plate, a lower supporting plate, an external thread steel pipe, a screw cap, a fixed steel bar and an anchoring steel bar; the upper supporting plate is sleeved on the external thread steel pipe, the nuts are sleeved on the external thread steel pipe above and below the upper supporting plate, the upper supporting plate is fixed through the nuts, the lower supporting plate is welded at the bottom of the external thread steel pipe, the edge of the lower supporting plate is provided with a rubber ring, the fixed steel bar is fixed at the top of the external thread steel pipe, the anchoring steel bar is fixed on the upper supporting plate, and a stirrup is bound on the anchoring steel bar;
the fixed reinforcing bar is fixed on the pile top steel plate, the part of connection structure below being located the fixed reinforcing bar set up in the PHC tubular pile, fill out the core concrete set up in the PHC tubular pile.
2. The apparatus for connecting a PHC pile head to a pile cap as claimed in claim 1, wherein the portion of the anchoring bar above the fixing bar has a trumpet structure with a large top and a small bottom.
3. The device for connecting the pile top of a PHC tubular pile with a pile cap according to claim 1, wherein the fixed steel bars comprise two plain steel bars, and the fixed steel bars are welded to the external threaded steel pipe and the steel plate of the pile top.
4. The connecting device for connecting the pile top of a PHC tubular pile and a bearing platform as claimed in claim 1, wherein the diameter of the lower supporting plate is larger than the diameter of the upper supporting plate and smaller than the inner diameter of the PHC tubular pile, and the difference between the inner diameter of the PHC tubular pile and the diameter of the lower supporting plate is 2.5-3.5 mm.
5. The connecting device of claim 1, wherein the anchoring bars are twisted bars and are uniformly arranged on the outer circumference of the upper support plate.
6. The device for connecting the pile top of a PHC pile with a pile cap as claimed in claim 1, wherein the rubber ring is a U-shaped rubber ring.
7. The device for connecting the pile top of a PHC pile to a pile cap as claimed in claim 1, wherein the nut is a hexagonal nut.
8. The device for connecting the pile top of a PHC tubular pile and a bearing platform as claimed in claim 1, wherein the upper supporting plate is provided with through holes arranged in a quincunx shape.
9. The connecting device of the PHC pile head and the cap as claimed in claim 1, wherein the upper support plate and the lower support plate are both steel plates.
10. The construction method of a connecting device of a PHC tubular pile top and a bearing platform as claimed in any one of claims 1 to 9, characterized in that: the method comprises the following steps:
step S1, placing the prefabricated steel pipe on a threading machine for thread engraving to form the external thread steel pipe;
step S2, processing a steel plate to form the upper supporting plate and the lower supporting plate, respectively sleeving the upper supporting plate and two nuts on the external thread steel pipe, positioning the upper supporting plate between the two nuts, fixing the lower supporting plate at the bottom end of the external thread steel plate, and sleeving a rubber ring on the edge of the lower supporting plate;
step S3, welding anchoring steel bars on the upper supporting plate, and binding stirrups on the anchoring steel bars;
step S4, welding the fixed steel bars to the top of the external thread steel pipe, wherein the upper supporting plate, the lower supporting plate, the external thread steel pipe, the screw cap, the fixed steel bars and the anchoring steel bars form the connecting structure together;
step S5, placing the connecting structure into a PHC tubular pile, and welding the fixed steel bars on the pile top steel plate;
and step S6, pouring core filling concrete in the PHC pipe pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110658262.7A CN113356254A (en) | 2021-06-15 | 2021-06-15 | Connecting device for pile top and bearing platform of PHC (prestressed high-strength concrete) pipe pile and construction method of connecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110658262.7A CN113356254A (en) | 2021-06-15 | 2021-06-15 | Connecting device for pile top and bearing platform of PHC (prestressed high-strength concrete) pipe pile and construction method of connecting device |
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| Publication Number | Publication Date |
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| CN113356254A true CN113356254A (en) | 2021-09-07 |
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| CN202110658262.7A Pending CN113356254A (en) | 2021-06-15 | 2021-06-15 | Connecting device for pile top and bearing platform of PHC (prestressed high-strength concrete) pipe pile and construction method of connecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045821A (en) * | 2021-12-14 | 2022-02-15 | 福建省交通规划设计院有限公司 | Combined connection type pile plate structure and construction method thereof |
| CN114657977A (en) * | 2022-02-24 | 2022-06-24 | 中建一局集团第二建筑有限公司 | Prestressed concrete tubular pile tip crack reinforcing and strengthening device |
| CN115012438A (en) * | 2021-12-14 | 2022-09-06 | 广州城建职业学院 | Diameter-adjustable connecting structure for connecting pile top of concrete precast tubular pile with bearing platform and preparation method of diameter-adjustable connecting structure |
-
2021
- 2021-06-15 CN CN202110658262.7A patent/CN113356254A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045821A (en) * | 2021-12-14 | 2022-02-15 | 福建省交通规划设计院有限公司 | Combined connection type pile plate structure and construction method thereof |
| CN115012438A (en) * | 2021-12-14 | 2022-09-06 | 广州城建职业学院 | Diameter-adjustable connecting structure for connecting pile top of concrete precast tubular pile with bearing platform and preparation method of diameter-adjustable connecting structure |
| CN114657977A (en) * | 2022-02-24 | 2022-06-24 | 中建一局集团第二建筑有限公司 | Prestressed concrete tubular pile tip crack reinforcing and strengthening device |
| CN114657977B (en) * | 2022-02-24 | 2023-10-20 | 中建一局集团第二建筑有限公司 | Prestressed concrete pipe pile end crack reinforcing device |
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