CN211340766U - Steel reinforcement cage building structure for breaking pile head of cast-in-place pile through static blasting by reverse construction method - Google Patents
Steel reinforcement cage building structure for breaking pile head of cast-in-place pile through static blasting by reverse construction method Download PDFInfo
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- CN211340766U CN211340766U CN201921616311.5U CN201921616311U CN211340766U CN 211340766 U CN211340766 U CN 211340766U CN 201921616311 U CN201921616311 U CN 201921616311U CN 211340766 U CN211340766 U CN 211340766U
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Abstract
The utility model discloses a structure is set up to steel reinforcement cage that reverse construction method static blasting abolished bored concrete pile head. The steel reinforcement cage erection structure comprises a steel reinforcement cage body (1) and a pile head breaking auxiliary breaking part (2); the pile head breaking auxiliary breaking part (2) is arranged on the reinforcement cage body (1) and is positioned above the elevation position of the pile head breaking; and before the pile head of the cast-in-place pile is cast and the cast concrete reaches the designed strength, the pile head breaking auxiliary breaking part (2) can pre-break the concrete of the pile head part of the cast-in-place pile. The utility model discloses a steel reinforcement cage sets up the structure and can realize that reverse construction method static blasting breaks away bored concrete pile head, makes breaking away construction process simple of bored concrete pile head, is favorable to quick effectual breaking away bored concrete pile head, greatly reduced later stage machinery and the artifical work degree of difficulty that breaks away the pile head, improved the efficiency of construction, reduced construction cost.
Description
Technical Field
The utility model relates to a bored concrete pile construction technical field, concretely relates to reverse construction method static blasting breaks away steel reinforcement cage of bored concrete pile head and sets up structure.
Background
In the construction of the cast-in-place pile, in order to ensure the strength of the pile head concrete, the elevation of the top of the cast-in-place pile is higher than the elevation of the designed pile top when the cast-in-place pile is cast, and the part of the pile head higher than the designed elevation of the pile top is chiseled off in the subsequent construction, namely the pile head of the cast-in-place pile is broken off.
For breaking concrete, cutting is usually adopted. At present, tools such as a hydraulic wall saw, an electric disc saw, a water drill or a road cutter are mainly used for cutting concrete, but the tools mainly aim at the concrete cutting in the horizontal direction. And the cutting of the pile head concrete of the cast-in-place pile belongs to the vertical cutting. At present, the cutting mode adopted for the pile head concrete of the cast-in-place pile is that the cutting and the breaking are carried out after the concrete of the pile head part reaches the design strength, so that the main reinforcement of the reinforcement cage and the acoustic pipe positioned inside the cast-in-place pile are easily damaged. On the premise of not influencing the main reinforcement of the cast-in-place pile, the pile head concrete of the cast-in-place pile is cut, so that the difficulty is high, the consumed time is long, the efficiency is low, and the construction cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the defect or not enough that exist among the prior art, a structure is set up to steel reinforcement cage that cast-in-place pile head was abolished in quiet blasting of reverse construction method is provided. This set up the structure and can realize that reverse construction method static blasting breaks away bored concrete pile head, makes the breaking construction process of bored concrete pile head simple, is favorable to quick effectual breaking bored concrete pile head, greatly reduced later stage machinery and the artifical work degree of difficulty that breaks away the pile head, improved the efficiency of construction, reduced construction cost.
The purpose of the utility model is realized through the following technical scheme.
A reinforcement cage erection structure for breaking a pile head of a cast-in-place pile by static blasting of a reverse construction method comprises a reinforcement cage body and a pile head breaking auxiliary breaking part; the pile head breaking auxiliary breaking part is arranged on the reinforcement cage body and is positioned above the elevation position of the pile head breaking;
before the pile head of the cast-in-place pile is poured and the poured concrete reaches the designed strength, the pile head breaking auxiliary breaking part can pre-break the concrete of the pile head of the cast-in-place pile.
Preferably, the pile head breaking auxiliary breaking part comprises a hollow cylindrical die and an annular hollow cylindrical die;
the hollow cylindrical die is sleeved on the main reinforcement of the reinforcement cage body, and two axial ends of the hollow cylindrical die are sealed with the main reinforcement of the reinforcement cage body; gaps are formed between the hollow cylindrical mould and the main reinforcements of the reinforcement cage body, and concrete pre-damaged fillers are filled in the gaps;
the annular hollow cylindrical die is fixedly connected with the reinforcement cage body and is arranged in the middle of the reinforcement cage body; the inner ring of the annular hollow cylindrical mold can accommodate the penetration of a concrete guide pipe for pouring; and the hollow interior of the annular hollow cylindrical mold is filled with concrete pre-damaged filler.
More preferably, the hollow cylindrical mold and the annular hollow cylindrical mold are both paraffin wax models.
More preferably, the concrete pre-breakage filler is sodium bicarbonate.
Preferably, the concrete pre-damaged filler is filled in a gap between the hollow cylindrical mold and the main reinforcement of the reinforcement cage body and in the hollow interior of the annular hollow cylindrical mold.
More preferably, the annular hollow cylindrical mould is arranged on the reinforcement cage body through a partition plate;
the partition plate is fixedly connected with a main rib of the reinforcement cage body and is positioned at an elevation position where the pile head is broken; the annular hollow cylindrical mold is arranged on the partition plate;
the middle of the clapboard is provided with a conduit hole corresponding to the size of the inner ring of the annular hollow cylindrical mould and used for accommodating the penetration of a concrete conduit for pouring;
the partition plate is provided with a main rib hole for accommodating a main rib of the reinforcement cage body to penetrate through; the hollow cylindrical die is sleeved on the main rib of the reinforcement cage body, and the bottom end of the partition plate is abutted to the edge of the main rib hole.
More preferably, an annular positioning groove is formed in the partition plate and located between the main rib hole and the conduit hole; the annular positioning groove is correspondingly matched with the shape of the annular hollow cylindrical mold and used for positioning and placing the annular hollow cylindrical mold.
Preferably, the partition plate is fixedly connected with the main reinforcement of the reinforcement cage body through a bottom support fastener;
the bottom support fastener is fixedly connected to the bottom surface of the partition plate through welding or screw locking; the bottom support fastener is locked, positioned and fixed on the main rib of the steel reinforcement cage body through a self-provided screw, so that the partition plate is fixedly connected with the main rib of the steel reinforcement cage body.
More preferably, the partition board is made of a material with a high thermal conductivity, and the material with a high thermal conductivity includes iron, that is, the partition board is selected from iron plates.
Still further preferably, the outer surface of the separator is coated with a release agent.
Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:
(1) the utility model discloses an among the set up structure, break and assist broken part through setting up the pile head more than the elevation position at the bored concrete pile head, make the pile head part can be destroyed in advance when the shaping, realize that reverse construction method static blasting breaks away the bored concrete pile head, make the breaking away construction process of bored concrete pile head simple, be favorable to quick effectual breaking away the bored concrete pile head, greatly reduced later stage machinery and the artifical work degree of difficulty that breaks away the pile head, improved the efficiency of construction, reduced construction cost.
(2) The utility model discloses an among the set up structure, hold the cavity cylinder mould that the concrete damaged filler in advance and pass through the baffle that the thermal conductivity is good and support, annular cavity cylinder mould and baffle contact, the hydration heat that releases when making the pile head break and assist broken part can effectively utilize the concrete to solidify heats to accomplish the destruction in advance to the pile head part, very big utilization each structural part's chemical characteristic, and need not to consume extra energy, effective energy saving, the efficiency of construction has further been improved and construction cost has been reduced.
Drawings
Fig. 1 is a schematic front view of a reinforcement cage erection structure for breaking a pile head of a cast-in-place pile by static blasting according to a reverse construction method in an embodiment of the present invention;
fig. 2 is a schematic top view of a reinforcement cage erecting structure for breaking a pile head of a cast-in-place pile by static blasting according to an embodiment of the present invention;
the attached drawings are marked as follows: 1-a reinforcement cage body, 11-a main rib, 2-a pile head breaking auxiliary breaking part, 21-a hollow cylindrical mould, 22-an annular hollow cylindrical mould, 23-concrete pre-breaking filler, 24-a partition plate, 241-a guide pipe hole, 242-a main rib hole, 243-an annular positioning groove, 25-a bottom support fastener and 3-the ground.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings, but the scope of protection and the implementation of the present invention are not limited thereto. In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", and the like refer to the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, and are only used for distinguishing the description, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the present invention, nor indicating or implying relative importance.
Example 1
Referring to fig. 1 and 2, a reinforcement cage erection structure for breaking a pile head of a cast-in-place pile by static blasting according to the reverse method of the present embodiment includes a reinforcement cage body 1 and a pile head breaking auxiliary breaking portion 2. The pile head breaking auxiliary breaking part 2 is arranged on the reinforcement cage body 1 and is positioned above the elevation position of the pile head breaking; specifically, the pile head breaking auxiliary breaking part 2 is located on the steel reinforcement cage body 1 and higher than the ground 3, namely, the pile head part of the cast-in-place pile, which is higher than the ground 3, needs to be broken.
Before the pile head of the cast-in-place pile is poured and the poured concrete reaches the designed strength, the pile head breaking auxiliary breaking part 2 can pre-break the concrete of the pile head part of the cast-in-place pile. The pile head breaking auxiliary breaking part 2 is arranged above the elevation position of the pile head of the cast-in-place pile, so that the pile head part can be broken in advance during forming. After the pile head part is pre-damaged, the cutting machine is adopted to cut the pile head part to complete the breaking of the pile head part, the operation is convenient and fast, and the main ribs and the sounding pipes cannot be damaged. So, realize that reverse construction method static blasting breaks away bored concrete pile head, begin promptly to break away the pile head part before the pile head part does not reach design strength, make the breaking construction process of bored concrete pile head simple, be favorable to quick effectual breaking bored concrete pile head, greatly reduced later stage machinery and the artifical work degree of difficulty that breaks away the pile head, improved the efficiency of construction, reduced construction cost.
The pile head breaking auxiliary breaking part 2 comprises a hollow cylindrical die 21 and an annular hollow cylindrical die 22.
The hollow cylindrical mold 21 is sleeved on the main reinforcement 11 of the reinforcement cage body 1, and both ends in the axial direction of the hollow cylindrical mold are sealed with the main reinforcement 11 of the reinforcement cage body 1. Meanwhile, a gap is formed between the hollow cylindrical mold 21 and the main reinforcement 11 of the reinforcement cage body 1, and concrete pre-damaged filler 23 is filled in the gap.
The annular hollow cylindrical mold 22 is fixedly connected with the reinforcement cage body 1 and is arranged in the middle of the reinforcement cage body 1. The inner ring of the annular hollow cylindrical mold 22 can accommodate the penetration of a concrete guide pipe for pouring, and when the cast-in-place pile is poured, the concrete guide pipe can penetrate through the inner ring of the annular hollow cylindrical mold 22 and penetrate into the cast-in-place pile for pouring concrete; and the hollow inside of the annular hollow cylindrical mold 22 is filled with concrete pre-breakage filler 23.
The gap between the hollow cylindrical mold 21 and the main reinforcement of the reinforcement cage body 1 and the hollow interior of the annular hollow cylindrical mold 22 are filled with the concrete pre-damaged filler 23, the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 can be melted under heat to expose the concrete pre-damaged filler 23, and the concrete pre-damaged filler 23 can release gas under heat to expand or even crack the concrete, so that the pile head part is pre-damaged.
Specifically, the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 are both paraffin wax models, paraffin wax is insoluble in water, the melting point is low, the hardness is weak, and the ability of bonding the reinforcing steel bars and the concrete is weak. In the specific implementation process, paraffin is adopted to prepare a hollow cylindrical mold material, the hollow cylindrical mold material is sleeved on the main rib 11, then paraffin is used for sealing the bottom, the concrete pre-damaged filler 23 is filled, then the prepared paraffin plate is used for covering and sealing the cover, finally paraffin solution is used for sealing and sealing the edge, and the erection of the hollow cylindrical mold 21 and the concrete pre-damaged filler 23 filled in the hollow cylindrical mold is completed; in the process of erecting the annular hollow cylindrical mold 22, a groove model is prepared by paraffin, the concrete pre-damaged filler 23 is filled, the prepared paraffin mold top cover matched with the groove model is used for sealing, and the edge is sealed by paraffin solution, so that the erection of the annular hollow cylindrical mold 22 is completed.
The concrete pre-damage filler 23 is sodium bicarbonate which is unstable and can generate decomposition reaction when heated in a humid environment and release a large amount of carbon dioxide gas; the carbon dioxide gas expands when heated, so that a large number of cavities and even cracks are formed in the concrete of the pile head part, and the effect of damaging the pile head part is achieved.
When the pile head of the cast-in-place pile is poured, in the process that concrete is solidified to generate strength, because oxides in cement and water can generate chemical reaction, a large amount of hydration heat is released, and the temperature in the pile can be increased. The temperature rising in the pile is absorbed by the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22, and the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 are melted after absorbing heat due to low melting points. After the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 are melted, the concrete pre-damage filler 23 inside the hollow cylindrical mold is exposed outside and is in direct contact with the concrete, and after hydration heat released in the concrete solidification process is absorbed, a large amount of gas is generated to enable a large amount of cavities or even cracks to be formed inside the concrete, so that the strength of the concrete is greatly reduced, and the pre-damage to the pile head part is completed before the poured concrete reaches the designed strength. Moreover, the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 obstruct the bonding of the concrete with the main reinforcement 11 and the sounding pipe, so that the main reinforcement 11 and the sounding pipe are not damaged in the process of breaking the pile head.
Furthermore, the annular hollow cylindrical mold 22 is arranged on the reinforcement cage body 1 through a partition plate 24. The partition plate 24 has good heat conduction performance, and can well transfer the hydration heat emitted by the concrete below the partition plate to the upper part, so that the heat absorption melting of the hollow cylindrical mold 21 and the annular hollow cylindrical mold 22 and the thermal decomposition of the concrete pre-damaged filler 23 are accelerated.
The partition plate 24 is fixedly connected with the main reinforcement 11 of the reinforcement cage body 1 and is positioned at the elevation position where the pile head is broken; the annular hollow cylindrical mold 22 is disposed on the partition plate 24.
In this embodiment, the size of the partition 23 is the same as the size of the cross section of the steel reinforcement cage body 1. In addition, a conduit hole 241 corresponding to the inner ring size of the annular hollow cylindrical mold 22 is formed in the middle of the partition plate 24 to accommodate the penetration of a concrete conduit for casting.
The partition plate 24 is provided with a main rib hole 242 for accommodating the main rib 11 of the reinforcement cage body 1 to penetrate through, and in the erecting process of the partition plate 24, the main rib hole 242 in the partition plate 24 is aligned with the main rib 11 and is sleeved in, so that the partition plate 24 is placed on the reinforcement cage body 1. When the hollow cylindrical mold 21 is sleeved on the main reinforcement 11 of the reinforcement cage body 1, the bottom end of the hollow cylindrical mold 21 close to the partition plate 24 abuts against the edge of the main reinforcement hole 242.
So, hold the cavity cylinder mould 21 of concrete pre-damage filler 23 and support through the baffle 24 that heat conductivility is good, annular cavity cylinder mould 22 and baffle 24 contact, make the pile head break and assist broken part 2 and can effectively utilize the hydration heat that the concrete released when solidifying to heat, destroy in advance to the pile head part in order to accomplish, very big utilization each structural part's chemical characteristic, and need not to consume extra energy, effective energy saving, further improved the efficiency of construction and reduced construction cost.
In this embodiment, an annular positioning groove 243 is disposed on the partition plate 24 between the main rib hole 242 and the conduit hole 241; the annular positioning groove 243 is correspondingly adapted to the shape of the annular hollow cylindrical mold 22, and is used for positioning and placing the annular hollow cylindrical mold 22. Through the design of annular positioning groove 243, make placing that annular hollow cylinder mould 22 can fix a position on the middle part position of baffle 24, avoid annular hollow cylinder mould 22 to take place the displacement easily to appear stopping or being scraped the damage by the concrete pipe formation of usefulness of pouring and leading to the concrete to damage filler 23 and expose in advance bad phenomenon.
Moreover, in an alternative embodiment, the partition plate 24 is fixed to the main reinforcement 11 in a manner that the partition plate 24 can be removed after the pile head is broken, and the main reinforcement 11 is not damaged.
Specifically, in this embodiment, the partition plate 24 is fixedly connected to the main reinforcement 11 of the reinforcement cage body 1 through a bottom fastener 25. Wherein, the bottom bracket fastener 25 is fixedly connected to the bottom surface of the partition plate 24 by welding or screw locking; the bottom support fastener 25 is locked, positioned and fixed on the main reinforcement 11 of the steel reinforcement cage body 1 through a screw, so that the partition plate 24 is fixedly connected with the main reinforcement 11 of the steel reinforcement cage body 1.
The partition plate 24 is fixedly connected to the main reinforcement 11 of the reinforcement cage body 1 through the bottom support fastener 25, the bottom support fastener 25 and the main reinforcement 11 can be locked through simple screws, and the partition plate 24 and the main reinforcement 11 form a fixed connection relationship, so that the disassembly is convenient; thereby when guaranteeing to carry out effective fixed to baffle 24 at the concreting in-process, the dismantlement of baffle 24 when breaking out the pile head part timesharing of still being convenient for is taken out, and can not cause the damage to main muscle 11, has greatly improved the abolishing efficiency of construction of bored concrete pile head.
Furthermore, the partition plate 24 is made of a material with a high thermal conductivity, and the material with a high thermal conductivity includes iron. In this embodiment, the partition plate 24 is an iron plate, which is beneficial to ensure that the heat dissipated by the concrete at the bottom of the partition plate 24 is conducted to the hollow cylindrical mold 21, the annular hollow cylindrical mold 22 and the concrete pre-damaged filler 23 located at the top of the hollow cylindrical mold.
And the release agent is coated on the outer surface of the partition plate 24, so that the release agent can effectively prevent the partition plate 24 from being bonded with concrete, the partition plate 24 is convenient to disassemble, and the construction efficiency is improved.
The above embodiments are merely preferred embodiments of the present invention, and only lie in further detailed description of the technical solutions of the present invention, but the protection scope and the implementation manner of the present invention are not limited thereto, and any changes, combinations, deletions, replacements, or modifications that do not depart from the spirit and principles of the present invention will be included in the protection scope of the present invention.
Claims (9)
1. A reinforcement cage erection structure for breaking a pile head of a cast-in-place pile by static blasting of a reverse construction method is characterized by comprising a reinforcement cage body (1) and a pile head breaking auxiliary breaking part (2); the pile head breaking auxiliary breaking part (2) is arranged on the reinforcement cage body (1) and is positioned above the elevation position of the pile head breaking;
and before the pile head of the cast-in-place pile is cast and the cast concrete reaches the designed strength, the pile head breaking auxiliary breaking part (2) can pre-break the concrete of the pile head part of the cast-in-place pile.
2. The reinforcement cage building structure for demolishing the pile head of the bored pile by static blasting of the reverse method according to claim 1, wherein the pile head demolishing auxiliary demolishing section (2) includes a hollow cylindrical form (21) and a ring-shaped hollow cylindrical form (22);
the hollow cylindrical mould (21) is sleeved on the main reinforcement of the reinforcement cage body (1), and two axial ends of the hollow cylindrical mould and the main reinforcement of the reinforcement cage body (1) are sealed; a gap is formed between the hollow cylindrical mould (21) and a main reinforcement of the reinforcement cage body (1), and concrete pre-damaged filler (23) is filled in the gap;
the annular hollow cylindrical mould (22) is fixedly connected with the reinforcement cage body (1) and is arranged in the middle of the reinforcement cage body (1); the inner ring of the annular hollow cylindrical mould (22) can accommodate the penetration of a concrete guide pipe for pouring; and the hollow interior of the annular hollow cylindrical mold (22) is filled with concrete pre-damaged filler (23).
3. The reinforcement cage building structure for demolishing a pile head of a bored pile by reverse static blasting according to claim 2, wherein the hollow cylindrical mold (21) and the annular hollow cylindrical mold (22) are both paraffin wax models.
4. The reinforcement cage building structure for breaking the pile head of the cast-in-place pile by static blasting of the reverse method according to claim 2, wherein the concrete pre-breaking filler (23) is sodium bicarbonate.
5. A reinforcement cage building structure for demolishing a pile head of a bored pile by static blasting of a reverse construction method according to claim 3, wherein the gap between the hollow cylindrical form (21) and the main reinforcement of the reinforcement cage body (1) and the hollow inside of the annular hollow cylindrical form (22) are filled with the concrete pre-demolition filling material (23).
6. The reinforcement cage erection structure for demolishing a pile head of a bored pile by static blasting according to any one of claims 2 to 5, wherein the annular hollow cylindrical mold (22) is disposed on the reinforcement cage body (1) through a partition plate (24);
the partition plate (24) is fixedly connected with a main reinforcement of the reinforcement cage body (1) and is positioned at an elevation position where a pile head is broken; the annular hollow cylindrical mould (22) is arranged on the partition plate (24);
the middle of the clapboard (24) is provided with a conduit hole (241) corresponding to the size of the inner ring of the annular hollow cylindrical mould (22) and used for accommodating the penetration of a concrete conduit for pouring;
a main rib hole (242) for accommodating a main rib of the reinforcement cage body (1) to penetrate is formed in the partition plate (24); the hollow cylindrical mold (21) is sleeved on the main reinforcement of the reinforcement cage body (1), and the bottom end close to the partition plate (24) is abutted to the edge of the main reinforcement hole (242).
7. The reinforcement cage building structure for breaking the pile head of the cast-in-place pile by means of the reverse static blasting of the claim 6, characterized in that the partition (24) is provided with an annular positioning groove (243) between the main reinforcement hole (242) and the guide pipe hole (241); the annular positioning groove (243) is correspondingly matched with the shape of the annular hollow cylindrical mold (22) and used for positioning and placing the annular hollow cylindrical mold (22).
8. The reinforcement cage building structure for breaking the pile head of the cast-in-place pile by means of reverse static blasting according to claim 6, wherein the partition plate (24) is fixedly connected with the main reinforcement of the reinforcement cage body (1) through a bottom support fastener (25);
wherein the bottom support fastener (25) is fixedly connected to the bottom surface of the partition plate (24) through welding or screw locking; collet fastener (25) are fixed through taking screw locking location certainly on the main muscle of steel reinforcement cage body (1), make baffle (24) with the main muscle fixed connection of steel reinforcement cage body (1).
9. The reinforcement cage building structure for breaking the pile head of the cast-in-place pile by static blasting of the reverse method according to claim 6, wherein the partition plate (24) is selected from the group consisting of iron plates; and the outer surface of the separator (24) is coated with a release agent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921616311.5U CN211340766U (en) | 2019-09-26 | 2019-09-26 | Steel reinforcement cage building structure for breaking pile head of cast-in-place pile through static blasting by reverse construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921616311.5U CN211340766U (en) | 2019-09-26 | 2019-09-26 | Steel reinforcement cage building structure for breaking pile head of cast-in-place pile through static blasting by reverse construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110656644A (en) * | 2019-09-26 | 2020-01-07 | 广东省建筑工程机械施工有限公司 | Reinforcement cage erecting structure and method for breaking pile head of cast-in-place pile through static blasting by reverse construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110656644A (en) * | 2019-09-26 | 2020-01-07 | 广东省建筑工程机械施工有限公司 | Reinforcement cage erecting structure and method for breaking pile head of cast-in-place pile through static blasting by reverse construction method |
| CN110656644B (en) * | 2019-09-26 | 2024-02-09 | 广东省建筑工程机械施工有限公司 | Reinforcement cage erecting structure and method for breaking pile head of cast-in-place pile through reverse static blasting |
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