CN111021356A - Method and device for recovering steel casing of mudflat pile foundation - Google Patents
Method and device for recovering steel casing of mudflat pile foundation Download PDFInfo
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- CN111021356A CN111021356A CN201911367589.8A CN201911367589A CN111021356A CN 111021356 A CN111021356 A CN 111021356A CN 201911367589 A CN201911367589 A CN 201911367589A CN 111021356 A CN111021356 A CN 111021356A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
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Abstract
The invention discloses a method for recovering a steel casing of a beach pile foundation, which relates to the technical field of cast-in-place pile construction in bridge engineering and comprises the following steps: s1: firstly, punching, and fixing the outer protective cylinder in the deep hole; s2: arranging demoulding isolation layers on the inner surface and the outer surface of the inner protecting cylinder, placing the inner protecting cylinder inside the outer protecting cylinder, and punching fillers between the inner protecting cylinder and the outer protecting cylinder, wherein the inner protecting cylinder and the outer protecting cylinder are relatively fixed; s3: placing a reinforcement cage, and relatively fixing the reinforcement cage and the inner protective cylinder; s4: pouring concrete, and stopping pouring when the amount of the concrete exceeds the top of the reinforcement cage; s5: when the concrete does not reach the initial setting, loosening the temporary fixation between the outer protective cylinder and the inner protective cylinder, and then pulling out the outer protective cylinder; s6: and after the concrete is solidified, removing the fixing device between the inner protective cylinder and the reinforcement cage, and then pulling out the inner protective cylinder. According to the invention, the outer pile casing is firstly removed, and then the inner pile casing is removed, so that the pile foundation quality can be ensured. And can effectively avoid outer protecting a section of thick bamboo and interior protecting a section of thick bamboo impaired, conveniently retrieve.
Description
Technical Field
The invention relates to the technical field of cast-in-place pile construction in bridge engineering, in particular to a method and a device for recovering a steel casing of a mudflat pile foundation.
Background
In the construction process of the bridge engineering pile foundation, in order to ensure the stability of soil around the pile foundation and prevent the infiltration of underground water, a steel casing is generally adopted to protect the pile hole. The steel casing that the pile foundation adopted is the whole steel ring of making according to pile foundation aperture size, and it is huge to consume steel. In the past, due to the fact that construction technology is backward, a steel casing cannot be recycled, or only a part of the steel casing with an exposed water surface can be recycled, or the recycling cost of the steel casing is too high, the steel casing is not required to be recycled, and a large amount of steel is wasted. In the aspect of environmental influence, the unrecovered steel casing is positioned in an underwater soil layer for a long time after the pile foundation is finished, and the corrosion of steel can pollute water and soil resources and the surrounding environment. In order to respond to the basic national policy of saving resources and protecting the environment in China and reduce the construction cost, the steel casing for pile foundation construction needs to be recycled, and various technologies for lossless recovery of the steel casing are gradually formed at present.
The existing research mainly focuses on the aspects of underwater pile foundation recovery and land pile foundation recovery and the like, and can be summarized into two types of single pile casing recovery and double pile casing recovery. Wherein, the recovery of the single pile casing mainly adopts large-scale apparatus to be directly pulled out, such as pulling out by matching a pressure jacking method with hoisting equipment, or directly pulling out after reducing the frictional resistance of the pile soil by adopting modes of rotation, vibration and the like. The double-protection-cylinder recovery mainly takes two forms: one is a partial recycling mode, and the steel pile casing is divided into a section of integral steel pile casing and a section of split steel pile casing. Wherein the integral steel casing is directly inserted into the riverbed without recovery, the split steel casing is formed by mutually splicing a pair of semicircular rings and is connected with the integral steel casing through a connecting device, the part is remained in water, and only the split steel casing is recovered at the later stage (No. CN 201144419Y); the other method for recovering the double-steel casing adopts the form of an inner casing and an outer casing, the inner casing and the outer casing are arranged in the pile foundation hole, a spacing material is filled between the two casings, and the recovery of the steel casing is realized by staggering the extraction time of the inner casing and the outer casing. The method is characterized in that the inner protective cylinder is pulled out firstly when concrete is poured, the inner protective cylinder and the outer protective cylinder are used as supports by virtue of the spacing materials of the inner protective cylinder and the outer protective cylinder, and the outer protective cylinder is pulled out when the concrete is gradually formed, so that the recovery of the steel protective cylinder is realized.
The above is the current state of the existing steel casing recovery technology, however, the tidal flat is a general name of the beach, the river beach and the lake beach, is a tidal immersion zone between the high tide level and the low tide level of the coastal high tide, and is generally a shallow water beach. The construction environment of the mudflat pile foundation is greatly different from the construction of the pile foundations on the underwater and land, the geological condition of a mudflat area is complex, weak layers such as silt and silt are more, the bearing capacity of the foundation is weak, and hole collapse is easy to cause. The existing research aims at the shortage of a steel casing recovery technology in mudflat pile foundation construction.
In the steel pile casing recovery technology, the double pile casing recovery technology adopting an inner protective casing and an outer protective casing is the closest to the invention, and in the implementation scheme, the Chinese utility model patent document with the authorization notice number of CN 102966096A in the existing similar implementation scheme discloses a construction method of a double pile casing of a large-diameter cast-in-situ bored pile. The steel protective cylinder is in the form of an inner protective cylinder and an outer protective cylinder, a spacing material is filled between the two protective cylinders, and the steel protective cylinder is recycled by staggering the pulling-out time of the inner protective cylinder and the outer protective cylinder. The key point is that when the inner protection barrel is manufactured, two layers of bell mouths are arranged at the bottom of the inner protection barrel, a limiting plate used for being erected on the outer protection barrel is welded on the outer side of the inner protection barrel, wherein the outer side of the limiting plate is 0.1-0.3 meter downward, and the inner protection barrel is installed at the top end of the outer protection barrel. The inner protective cylinder is pulled out before the initial setting of the concrete, the backfill materials of the inner protective cylinder and the outer protective cylinder are used as supports, and the outer protective cylinder is pulled out when the strength of the concrete reaches a certain strength.
However, the above prior art has the following disadvantages: 1. the single pile casing form directly pulled out by large-scale instruments can cause serious deformation of pile head concrete, pile extension needs to be chiseled off from unqualified parts of the pile head, and large-scale mechanical equipment used for pulling out increases construction cost. 2. In the recovery form of the inner and outer double pile casings, if the steel pile casing is pulled out before concrete is solidified and formed, the pile foundation part above the mudflat surface is easily damaged and collapses or the pile head is exposed and dispersed by seawater, so that the height of the pile head is insufficient, the quality of the concrete at the pile top is unqualified during pile inspection, the unqualified part needs to be chiseled for pile splicing, the cost is increased, and the quality of the pile foundation is not favorable. When the outer protective cylinder cannot be lifted by static force, the outer protective cylinder needs to be pulled out by a vibration hammer, so that the pile body is influenced. If the concrete of the exposed part does not appear, the time for pulling out the outer protective cylinder is delayed, but the outer protective cylinder can not be pulled out after the concrete is solidified, and the method can only be used when the water level of river water in a tidal flat area is shallow, and cannot be used when the water level reaches a certain river water depth.
Therefore, a new method and a new device for recovering the steel casing of the mudflat pile foundation are urgently needed in the market, and are used for solving the problems.
Disclosure of Invention
The invention aims to provide a method and a device for recovering a steel casing of a beach pile foundation, which are used for solving the technical problems in the prior art, avoiding the damage of the steel casing, enabling the steel casing to be repeatedly utilized, reducing the damage of pile head concrete of the beach pile foundation and improving the quality of the pile foundation.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a method for recovering a steel casing of a beach pile foundation, which comprises the following steps:
s1: firstly, punching, and fixing the outer protective cylinder in the deep hole;
s2: the inner and outer surfaces of the inner protective cylinder are provided with demoulding isolation layers, the inner protective cylinder is placed inside the outer protective cylinder, the positions of the inner protective cylinder and the outer protective cylinder are relatively fixed through four lifting lugs, and then fillers are filled between the inner protective cylinder and the outer protective cylinder;
s3: placing a reinforcement cage, and relatively fixing the reinforcement cage and the inner protective cylinder;
s4: pouring concrete, and stopping pouring when the amount of the concrete exceeds the top of the reinforcement cage;
s5: when the concrete does not reach the initial setting, loosening the temporary fixation between the outer protective cylinder and the inner protective cylinder, and then pulling out the outer protective cylinder;
s6: and after the concrete is solidified, removing the fixing device between the inner protective cylinder and the reinforcement cage, and then pulling out the inner protective cylinder.
Preferably, the outer protective sleeve, the inner protective sleeve and the reinforcement cage are coaxial.
Preferably, before the outer protective sleeve is pulled out, residual muddy water in the outer protective sleeve is discharged.
Preferably, after the muddy water is discharged, the outer protective barrel is loosened by using the vibration hammer, and the switch is closed after the vibration hammer vibrates, so that the disturbance of the vibration hammer on the pile foundation concrete is reduced.
Preferably, when the outer casing is pulled out, the outer casing should be stopped for a period of time when the lower port of the outer casing reaches the sludge surface, and the outer casing is continuously pulled out after the slurry and the concrete mixture in the outer casing are still.
The invention discloses a beach pile foundation recovery steel casing device which comprises an inner casing, an outer casing, a reinforcement cage and a plurality of lifting lugs, wherein the outer casing is fixed on the outer side of the inner casing, the reinforcement cage is fixed on the inner side of the inner casing, and the plurality of lifting lugs are fixed on the side wall of an upper port of the inner casing.
Preferably, the inner protecting cylinder is a circular truncated cone, the diameter of the upper port of the inner protecting cylinder is smaller than that of the lower port, and the outer protecting cylinder is a cylinder.
Preferably, the steel reinforcement cage further comprises Z-shaped steel bars, wherein the first ends of the Z-shaped steel bars are fixed to the upper port of the steel reinforcement cage, and the second ends of the Z-shaped steel bars are fixed to the upper port of the inner protective cylinder.
Preferably, a circular ring is fixed at the upper port of the inner protecting cylinder.
Compared with the prior art, the invention has the following technical effects:
the invention extracts the outer casing in the initial setting period of the concrete and extracts the inner casing in the final setting period of the concrete, and the following advantages can be obtained by the way: 1. the device has stable pile foundation forming quality; 2. the device is simple to operate and high in working efficiency; 3. the pile foundation construction can be repeatedly utilized by using the device; 4. the device can avoid deformation of the pile foundation and make the operation process easier.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 creative efforts.
FIG. 1 is a schematic structural view of a recycled steel casing device for a mudflat pile foundation in the embodiment;
FIG. 2 is a schematic view of the structure of the lifting lug of the present embodiment;
FIG. 3 is a schematic view of a connection structure of the inner casing and the ring according to the present embodiment;
in the figure: 1-an outer protective cylinder; 2-inner protecting cylinder; 3-a reinforcement cage; 4-Z-shaped steel bars; 5-lifting lugs; 6-circular ring.
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 aims to provide a method and a device for recovering a steel casing of a beach pile foundation, which are used for solving the technical problems in the prior art, avoiding the damage of the steel casing, enabling the steel casing to be repeatedly utilized, reducing the damage of pile head concrete of the beach pile foundation and improving the quality of the pile foundation.
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.
As shown in fig. 1 to 3, the embodiment provides a method for recovering a steel casing of a beach pile foundation, which includes the following steps:
s1: firstly, punch, fix outer protective barrel 1 in the deep hole, the installation of outer protective barrel 1 is unanimous with the process of normal pile foundation pore-forming, consequently does not add the unnecessary repetition.
S2: the inner surface and the outer surface of the inner protective cylinder 2 are provided with demoulding isolation layers, the inner protective cylinder 2 is placed inside the outer protective cylinder 1, and the demoulding isolation layers are made of template paint. Be equipped with four lugs 5 on the interior section of thick bamboo 2 that protects, four lugs 5 protect a 2 upper end evenly distributed in, offset through four lugs 5 and the inner wall of protecting a 1 outward to realize protecting a 2 and protecting a 1 relatively fixed outward in, inwards protect again and dash into the filler between a 2 and the outer section of thick bamboo 1, avoid protecting a 2 and protecting a 1 relative displacement from taking place in. Furthermore, a plurality of cushion blocks can be arranged on the inner wall of the lower port of the outer casing 1 by the technical personnel in the field, the lower port of the inner casing 2 is limited by the cushion blocks, and the inner casing 2 is prevented from relative displacement.
S3: putting the reinforcement cage 3 into the inner protective cylinder 2, and relatively fixing the reinforcement cage 3 and the inner protective cylinder 2. The steel reinforcement cage 3 is fixed with the inner protective cylinder 2 through the Z-shaped steel bar 4, and the upper port of the steel reinforcement cage 3 is 60cm higher than the upper port of the inner protective cylinder 2.
S4: and (5) injecting concrete, and stopping pouring when the amount of the concrete exceeds the top of the reinforcement cage 3. The purpose is that when preventing to protect a section of thick bamboo 1 outside pulling out, the concrete is owing to need fill the outer shared volume of protecting a section of thick bamboo 1 itself in the soil layer and protect a section of thick bamboo 2 and protect the space between a section of thick bamboo 1 outward to lead to the pile bolck concrete that has pour to sink, the unqualified condition of pile head concrete quality appears.
S5: when the initial setting of the concrete is not reached, the concrete is generally controlled to be 3 to 4 hours after the pouring is finished. After discharging the muddy water in the outer protective barrel, adopting a vibration hammer to loosen the temporary fixation of the lifting lug between the outer protective barrel 1 and the inner protective barrel 2, and then pulling out the outer protective barrel 1.
S6: after the concrete is solidified, the fixing device between the inner casing 2 and the reinforcement cage 3 is removed, namely the Z-shaped reinforcement 4 is cut off, and then the inner casing 2 is pulled out through the structure of the lifting lugs 5 by using a crane.
In order to ensure the quality of the pile foundation and facilitate the installation and the removal of the device, the outer protective cylinder 1, the inner protective cylinder 2 and the reinforcement cage 3 in the embodiment are coaxial.
Before the outer protective barrel 1 is pulled out, the residual muddy water in the outer protective barrel 1 is discharged. The problem that the quality of the pile head concrete is unqualified due to the fact that the pile head concrete is excessively scoured violently by excessive mud water pressure when the outer pile casing 1 is pulled out is avoided.
After the muddy water is discharged, the outer protective cylinder 1 is loosened by using a vibration hammer. And the vibration hammer closes the vibration function after loosening the outer pile casing 1, so that the disturbance of the vibration hammer to the pile foundation concrete is reduced.
When the outer casing 1 is pulled out, the lower port of the outer casing 1 should be stopped for a period of time when reaching the sludge surface, and the outer casing 1 is continuously pulled out after the slurry and concrete mixture in the outer casing 1 is static. Because when the lower port of the outer casing 1 is pulled out to be close to a muddy surface, the excess slurry and the filler in the outer casing 1 can flow out from the gap between the inner casing 2 and the outer casing 1, in order to avoid the excessive impact of the water flow on the outer surface of the inner casing 2, the outer casing needs to be left for a certain time and pulled out upwards.
Before the inner protective barrel 2 is pulled out outwards, the Z-shaped reinforcing steel bars 4 connected with the pile foundation reinforcing cage 3 of the inner protective barrel 2 are cut off, then one lifting lug 5 of the inner protective barrel 2 is hung by a crane, the inner protective barrel is slightly loosened, then the other lifting lug 5 at the opposite angle is replaced, and the inner protective barrel 2 is loosened back and forth. After the single lifting lug 5 is loosened back and forth, the four lifting lugs 5 are hung at the same time, and the inner protective cylinder 2 is lifted out under the condition that four corners of the inner protective cylinder 2 are kept under balanced stress.
The embodiment discloses a mud flat pile foundation recovery steel protects a device, protects a section of thick bamboo 2, protects a section of thick bamboo 1, steel reinforcement cage 3 and lug 5 outward including interior. The outer casing 1 is fixed in the outside of the inner casing 2, prevents relative displacement between the outer casing 1 and the inner casing 2, and the outer casing 1 is arranged to effectively avoid substances such as external slurry from impacting the inner casing 2 wall, so that pile foundation formation quality is affected. The steel reinforcement cage 3 is fixed in the inboard of the inner protective cylinder 2, and the relative displacement between the inner protective cylinder 2 and the steel reinforcement cage 3 is prevented. The lifting lugs 5 are four, and the four lifting lugs 5 are uniformly fixed on the side wall of the upper port of the inner casing 2.
When the protective device is used, firstly, holes are punched, the outer protective barrel 1 is fixed in the holes, then the inner protective barrel 2 is fixed in the outer protective barrel 1, and the inner protective barrel 2 and the outer protective barrel 1 are relatively fixed. Then, the reinforcement cage 3 is placed into the inner protective cylinder 2, the reinforcement cage 3 and the inner protective cylinder 2 are relatively fixed, and concrete is poured to realize pouring. When the concrete is not initially set, the outer protective cylinder 1 is detached, and when the concrete is finally set, the inner protective cylinder 2 is detached.
According to the embodiment, the outer pile casing 1 is detached before initial setting of concrete, the outer pile casing is conveniently detached at this time, and after final setting, a pile foundation is formed, so that the inner pile casing 2 is detached, and damage to a pile column in the detaching process can be effectively avoided.
Specifically, in this embodiment, the inner protection barrel 2 is a circular truncated cone, the diameter of the upper port of the inner protection barrel 2 is smaller than the diameter of the lower port, and the outer protection barrel 1 is a cylinder. The outer diameter of the lower port of the inner protection cylinder 2 is 4-6cm smaller than the inner diameter of the outer protection cylinder, the outer diameter of the upper port of the inner protection cylinder 2 is 8cm smaller than the outer diameter of the lower port of the inner protection cylinder 2, and the diameter of the upper port of the inner protection cylinder 2 is more than 5cm larger than the designed pile diameter. In addition, the thickness of the inner pile casing 2 is 4-8mm, and the shape of pile head concrete can be maintained. In order to ensure that the inner protective cylinder 2 does not topple over, the length of the inner protective cylinder 2 buried below the sludge surface is larger than the length of the inner protective cylinder exposed above the sludge surface.
To steel reinforcement cage 3 and interior relative fixed between the section of thick bamboo 2, still include Z shaped steel muscle 4 in this embodiment, the first end of Z shaped steel muscle 4 welds in last port of steel reinforcement cage 3, and the second end of Z shaped steel muscle 4 welds in the last port of interior section of thick bamboo 2. When the steel bar needs to be removed, only the Z-shaped steel bar 4 needs to be sheared off.
In order to prevent the deformation of the upper port of the inner casing 2, in the present embodiment, a ring 6 is fixed to the upper port of the inner casing 2. The height of the ring 6 is 10cm, so that the strength of the upper port of the inner casing 2 can be enhanced.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A method for recovering a steel casing of a beach pile foundation is characterized by comprising the following steps:
s1: firstly, punching, and fixing the outer protective cylinder in the deep hole;
s2: the inner and outer surfaces of the inner protective cylinder are provided with demoulding isolation layers, the inner protective cylinder is placed inside the outer protective cylinder, the relative fixation of the positions of the inner protective cylinder and the outer protective cylinder is realized through four lifting lugs, and then fillers are filled between the inner protective cylinder and the outer protective cylinder;
s3: placing a reinforcement cage, and relatively fixing the reinforcement cage and the inner protective cylinder;
s4: pouring concrete, and stopping pouring when the amount of the concrete exceeds the top of the reinforcement cage;
s5: when the concrete does not reach the initial setting, loosening the temporary fixation between the outer protective cylinder and the inner protective cylinder, and then pulling out the outer protective cylinder;
s6: and after the concrete is solidified, removing the fixing device between the inner protective cylinder and the reinforcement cage, and then pulling out the inner protective cylinder.
2. The method for recovering the steel casing of the beach pile foundation according to claim 1, which is characterized in that: the outer protective cylinder, the inner protective cylinder and the reinforcement cage are coaxial.
3. The method for recovering the steel casing of the beach pile foundation according to claim 1, which is characterized in that: before the outer protective barrel is pulled out, the residual muddy water in the outer protective barrel is discharged.
4. The method for recovering the steel casing of the beach pile foundation according to claim 3, which is characterized in that: after discharging the muddy water, loosening the outer protective barrel by using the vibration hammer, and closing the switch after the vibration hammer vibrates so as to reduce the disturbance of the vibration hammer on the pile foundation concrete.
5. The method for recovering the steel casing of the beach pile foundation according to claim 1, which is characterized in that: when the outer protective cylinder is pulled out, the lower port of the outer protective cylinder is stopped for a period of time when reaching the sludge surface, and the outer protective cylinder is continuously pulled out after the slurry and concrete mixture in the outer protective cylinder is static.
6. The utility model provides a mud flat pile foundation retrieves steel and protects a device which characterized in that: the steel bar protecting device comprises an inner protecting cylinder, an outer protecting cylinder, a steel bar cage and lifting lugs, wherein the outer protecting cylinder is fixed on the outer side of the inner protecting cylinder, the steel bar cage is fixed on the inner side of the inner protecting cylinder, the lifting lugs are multiple, and the lifting lugs are fixed on the side wall of an upper port of the inner protecting cylinder.
7. The beach pile foundation recovery steel casing device of claim 6, which is characterized in that: the inner protective cylinder is a circular truncated cone, the diameter of the upper port of the inner protective cylinder is smaller than that of the lower port, and the outer protective cylinder is a cylindrical cylinder.
8. The beach pile foundation recovery steel casing device of claim 6, which is characterized in that: still include Z shaped steel, the first end of Z shaped steel is fixed in the last port of steel reinforcement cage, the second end of Z shaped steel is fixed in the last port of interior casing.
9. The beach pile foundation recovery steel casing device of claim 6, which is characterized in that: and a circular ring is fixed at the upper port of the inner protective cylinder.
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| CN201911367589.8A CN111021356A (en) | 2019-12-26 | 2019-12-26 | Method and device for recovering steel casing of mudflat pile foundation |
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| CN201911367589.8A CN111021356A (en) | 2019-12-26 | 2019-12-26 | Method and device for recovering steel casing of mudflat pile foundation |
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Cited By (4)
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| CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
| CN114277791A (en) * | 2022-01-20 | 2022-04-05 | 中铁十五局集团有限公司 | Method for recycling water and plastic flow stratum pile foundation steel casing |
| CN115142458A (en) * | 2022-07-27 | 2022-10-04 | 广州市市政工程设计研究总院有限公司 | Pile foundation capable of controlling horizontal deformation and construction method |
| CN116733048A (en) * | 2023-08-10 | 2023-09-12 | 中建四局建设发展有限公司 | Pile splicing structure of soft soil foundation filling pile and construction method thereof |
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| CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
| CN114277791A (en) * | 2022-01-20 | 2022-04-05 | 中铁十五局集团有限公司 | Method for recycling water and plastic flow stratum pile foundation steel casing |
| CN115142458A (en) * | 2022-07-27 | 2022-10-04 | 广州市市政工程设计研究总院有限公司 | Pile foundation capable of controlling horizontal deformation and construction method |
| CN116733048A (en) * | 2023-08-10 | 2023-09-12 | 中建四局建设发展有限公司 | Pile splicing structure of soft soil foundation filling pile and construction method thereof |
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Application publication date: 20200417 |