CN112323804A - Pile top pouring height control device and method for underwater concrete pouring pile - Google Patents

Pile top pouring height control device and method for underwater concrete pouring pile Download PDF

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Publication number
CN112323804A
CN112323804A CN202011164235.6A CN202011164235A CN112323804A CN 112323804 A CN112323804 A CN 112323804A CN 202011164235 A CN202011164235 A CN 202011164235A CN 112323804 A CN112323804 A CN 112323804A
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China
Prior art keywords
position indicating
indicating rod
pile
pouring
buoyancy
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Pending
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CN202011164235.6A
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Chinese (zh)
Inventor
王新宇
何修义
郭文林
童建勇
罗星
昝永奇
陈明春
徐成双
张彪
王俊波
张怡
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Henan University of Technology
China Railway First Engineering Group Co Ltd
China Railway First Engineering Group Guangzhou Construction Engineering Co Ltd
Original Assignee
Henan University of Technology
China Railway First Engineering Group Co Ltd
China Railway First Engineering Group Guangzhou Construction Engineering Co Ltd
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Application filed by Henan University of Technology, China Railway First Engineering Group Co Ltd, China Railway First Engineering Group Guangzhou Construction Engineering Co Ltd filed Critical Henan University of Technology
Priority to CN202011164235.6A priority Critical patent/CN112323804A/en
Publication of CN112323804A publication Critical patent/CN112323804A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/06—Placing concrete under water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0061—Production methods for working underwater

Abstract

The invention discloses a pile top pouring height control device and a control method thereof for an underwater concrete pouring pile, wherein the device comprises a position indicating rod which is arranged on one side of a main reinforcement bar of a pouring pile reinforcement cage in parallel through a guide ring, a buoyancy ball is positioned at the bottom of the position indicating rod, and three-color reflective films are sequentially arranged up and down along the position indicating rod; and a sinking-preventing positioning clamp arranged above the position indicating rod; the initial positioning of the position indicating rod in a mud layer is controlled through the buoyancy of the buoyancy ball and the position indicating rod in mud, the liquid level of the cast-in-place concrete rises until the cast-in-place concrete is contacted with the buoyancy ball, the position indicating rod is pushed to gradually vertically rise, and the cast-in-place condition of the pile top of the cast-in-place concrete pile is determined by observing reflective films with different colors. The invention can accurately control the concrete pouring height of the pile top of the pouring pile by utilizing the self weight of the material and the buoyancy relation of the material in slurry; the operation is simple, the device is convenient and easy to understand, the device is simple to manufacture, the cost is low, the device can be repeatedly used, and the economic benefit is good.

Description

Pile top pouring height control device and method for underwater concrete pouring pile
Technical Field
The invention relates to the field of construction of underwater concrete cast-in-place piles in bridge engineering, geotechnical engineering and the like, in particular to a pile top casting height control device and a control method of the underwater concrete cast-in-place pile.
Background
The underwater cast-in-place pile is widely adopted in the fields of bridge engineering, geotechnical engineering and the like, and becomes the most important basic engineering form in civil engineering construction. The technical specification of the building pile foundation (JGJ 94-2008) stipulates that when the cast-in-place pile is poured, after concrete of the cast-in-place pile is poured to the designed elevation, the concrete is required to be over-poured by 50-100 cm so as to ensure the concrete strength of the pile head. Due to the existence of slurry in the pile hole of the cast-in-place pile, the construction process of the underwater cast-in-place pile belongs to hidden engineering, and the position of the free surface of cast-in-place concrete is difficult to accurately judge when the underwater concrete of the cast-in-place pile is cast, particularly the over-cast part after the cast-in-place pile reaches the designed elevation. Because the underwater concrete pouring height cannot be accurately judged in the construction process, the concrete over-pouring height is often far greater than the standard requirement, the concrete material is greatly wasted, and great difficulty is also increased for breaking the pile head formed by the pouring pile. Therefore, how to simply and accurately judge the pile top pouring height of the underwater concrete pouring pile in actual engineering becomes an important engineering problem which needs to be solved urgently.
In view of the complexity of the field construction environment, the underwater concrete cast-in-place pile top pouring height control device needs to have practical, simple and low-cost effects, and the simpler the use method, the better the use method.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for controlling the pile top pouring height of an underwater concrete pouring pile, which can effectively solve the problem that the pile top pouring height of the underwater concrete pouring pile is difficult to accurately control in the fields of bridge engineering, geotechnical engineering and the like.
The invention is realized by the following technical scheme.
The invention provides a pile top pouring height control device for an underwater concrete pouring pile, which comprises a position indicating rod, a buoyancy ball, a guide ring, a positioning clamp and a three-color reflecting film, wherein the position indicating rod is connected with the buoyancy ball; the position indicating rod is arranged on one side of a main reinforcement of the reinforcement cage of the cast-in-place pile in parallel through the guide ring, the buoyancy ball is positioned at the bottom of the position indicating rod, and the three-color reflective films are sequentially arranged up and down along the position indicating rod; the anti-sinking positioning clamp is arranged above the position indicating rod;
the initial positioning of the position indicating rod in a mud layer is controlled through the buoyancy of the buoyancy ball and the position indicating rod in mud, the liquid level of the cast-in-place concrete rises until the cast-in-place concrete is contacted with the buoyancy ball, the position indicating rod is pushed to gradually vertically rise, and the cast-in-place condition of the pile top of the cast-in-place concrete pile is determined by observing reflective films with different colors.
Preferably, the position indicating rod is a light hollow aluminum alloy rod, and the bottom of the position indicating rod is provided with an external thread.
Preferably, the buoyancy ball is a ball body with a hollow middle part and an internal thread at an upper opening, and the internal thread at the upper part of the buoyancy ball is connected with the external thread at the bottom of the position indicating rod in a matching manner.
Preferably, the three-color reflective film is a blue reflective film, a yellow reflective film and a red reflective film from top to bottom in sequence.
Preferably, the locator card includes a fixed part that is fixed in on the position pole and one articulate the fixed part and the embedded card wherein, the card is spacing card, can only take place 90 rotations when the card opens along the fixed part.
Preferably, one end of the guide ring is provided with a buckle, the other end of the guide ring is a hollow circular ring, and the guide ring is fixed on the main reinforcement of the reinforcement cage through the buckle.
The invention further provides a pile top pouring height control method of the underwater concrete pouring pile, which comprises the following steps:
1) determining the initial state of the position indicating rod, and determining the buoyancy of the buoyancy ball and the position indicating rod in the mud layer;
2) fixing the guide rings on the main reinforcement of the reinforcement cage of the cast-in-place pile, adjusting the two guide rings to be parallel and ensuring the centers of the hollow circular rings at one end of the guide rings to be on the same vertical line;
3) the position indicating rod penetrates through a hollow circular ring at one end of the guide ring, and a buoyancy ball is arranged at the bottom of the position indicating rod;
4) gradually lowering the position indicating rod until the positioning clamp at the upper end of the position indicating rod is contacted with a circular ring at one end of the guide ring;
5) pouring underwater concrete of the cast-in-place pile;
6) when the top surface of the concrete is contacted with the buoyancy ball, the concrete pushes the buoyancy ball to move upwards, and the position indicating rod moves upwards;
7) when a blue reflective film on the position indicating rod is observed, the concrete pouring condition is closely noticed; when a yellow reflective film on the position indicating rod is observed, preparing to stop pouring concrete; and when the red reflecting film on the position indicating rod is observed, stopping pouring concrete, and finishing the underwater concrete pouring construction of the cast-in-place pile.
The buoyancy of the buoyancy ball and the position indicating rod in a mud layer is determined by determining the mass of the position indicating rod and the buoyancy ball, and then the initial state of the position indicating rod is determined.
The invention has the beneficial effects that:
(1) the control device is simple in manufacturing principle, and can accurately control the pile top concrete pouring height of the underwater cast-in-place pile by utilizing the self weight of the material and the buoyancy relation of the material in slurry; after the method is implemented, the average value of the over-grouting height of the underwater concrete cast-in-place pile can be reduced by 15-25 cm, so that the great waste of concrete is avoided, and the smooth breaking of the pile head after the cast-in-place pile is formed is facilitated.
(2) The invention has simple structure, convenient operation and flexible assembly and disassembly, and the assembly and disassembly time is not more than 2 minutes. The method has wide application range, is suitable for underwater cast-in-place piles of different types and underwater diaphragm wall construction, and cannot be influenced by the construction environment in the control process.
(3) The pile top pouring height control device for the underwater concrete pouring pile is simple to manufacture, low in manufacturing cost, reusable and good in economic benefit.
(4) The operation method is simple and easy to understand, and common workers can use the method after simple demonstration without special training.
Drawings
Fig. 1 is a front view of a pile top pouring height control device for an underwater concrete pouring pile provided in embodiment 1 of the present invention;
FIG. 2 is a front view of the buoyant ball of the present invention;
FIG. 3 is a cross-sectional view of the buoyant spheres of the present invention;
FIG. 4 is a view of the card of the present invention in an open position;
FIG. 5 is a view of the card of the present invention in a closed position;
fig. 6 is a front view of the inventive buckle with guide ring.
In the figure: 1 is a main reinforcement of a filling pile reinforcement cage; 2 is a position indicating rod; 3 is a buoyancy ball; 4 is a guide ring; 5 is a positioning card; 6 is a blue reflective film; 7 is a yellow reflective film; 8 is a red reflecting film; and 9 is a buoyancy ball inner groove.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
As shown in fig. 1, the pile top pouring height control device for the underwater concrete pouring pile comprises a position indicating rod 2, a buoyancy ball 3, a guide ring 4, a positioning clamp 5, a blue reflective film 6, a yellow reflective film 7 and a red reflective film 8. The position indicating rod 2 is a hollow through pipe, and the position indicating rod 2 is arranged on one side of the main reinforcement bar 1 of the reinforcement cage of the cast-in-place pile in parallel through a guide ring 4; the buoyancy ball 3 is positioned at the bottom of the position indicating rod 2; the position indicating rod 2 is sleeved with a blue reflective film 6, a yellow reflective film 7 and a red reflective film 8 from top to bottom in sequence; an anti-sinking positioning clamp 5 is arranged above the position indicating rod.
Wherein the position indicating rod 2 is a light hollow aluminum alloy rod, and an external thread is attached to the lower end of the light hollow aluminum alloy rod within the range of 2.0 cm; the buoyancy ball 3 is a hollow aluminum alloy round ball with a threaded hole, and the bottom of the position indicating rod 2 is in threaded connection with the buoyancy ball 3.
In one embodiment, the light weight hollow aluminum alloy rod length l02.0m, a tube wall thickness d of 3mm, and a tube outer diameter r1Is 2cm, inner diameter r2Is 1.7 cm. In the embodiment, a circumferential blue reflective film 6 is pasted on the upper end of the light hollow aluminum alloy rod within the range of 0.4-0.8 m, a circumferential yellow reflective film 7 is pasted on the upper end of the light hollow aluminum alloy rod within the range of 0.8-1.0 m, and a circumferential red reflective film 8 is pasted on the upper end of the light hollow aluminum alloy rod within the range of 1.0-1.2 m.
As shown in fig. 2 and 3, the buoyancy ball 3 is a sphere with a hollow middle part and an internal buoyancy ball groove 9 at the upper end, the internal buoyancy ball groove 9 is matched with the external thread at the lower end of the light hollow aluminum alloy rod, and the buoyancy ball 3 is in threaded connection with the position indicating rod 2.
In one embodiment, the wall thickness D of the buoyancy ball 3 is 2-3 cm, and the outer diameter R of the buoyancy ball 315-6 cm, 3 inner diameter R of the buoyancy ball2Is 4.8-5.8 cm.
As shown in fig. 4 and 5, a sinking-proof positioning clip 5 is attached to the upper end of the position indicating rod 2; the positioning card 5 comprises a fixing part fixed on the position indicating rod 2 and a card which is hinged on the fixing part and embedded in the fixing part, the card is a limiting card, and the card can only rotate 90 degrees when the fixing part is opened.
As shown in fig. 6, one end of the guide ring 4 is provided with a buckle, the other end is a hollow circular ring, and the guide ring is fixed on the main reinforcement of the reinforcement cage 1 through one end of the guide ring. The inner diameter of a buckle at one end of the guide ring 4 is matched with the diameter of a main bar of the bored concrete pile reinforcement cage 1, and the inner diameter of the guide ring 4 is slightly larger than the diameter of the position indicating rod by 1 mm.
A plurality of guide rings 4, in this embodiment 2, may be arranged one above the other, with the upper guide ring 4 being secured to the pile cage bar 15 to 15cm below the upper face of the pile cage bar 1 and the other being secured to the pile cage bar 1 25 to 35cm below the upper face of the pile cage bar 1. The guide ring buckle is made of light high-strength plastic or light aluminum alloy.
The method for controlling the pile top pouring height of the underwater concrete pouring pile comprises the following steps:
1) in the initial state, determining the buoyancy of the buoyancy ball and the position indicating rod in the mud layer;
the mass and initial buoyancy of the position indicating rod and the buoyancy ball are determined by the following formula:
m1g+m2g＝1.02(F1+F2)～1.1(F1+F2) (1)
F1＝ρ1V1g (2)
F2＝ρ1V2g (3)
m1＝π(r1 2-r2 2)l0ρ2 (4)
Figure BDA0002745296100000051
in the formula, m1Mass of the position indicating rod; m is2Is the mass of the buoyant spheres; f1The buoyancy of the slurry to a position indicating rod immersed in the slurry; f2Is the buoyancy of the mud to the buoyancy ball; rho1Is the slurry density; rho2Is the material density of the position indicating rod; rho3Is the density of the buoyancy ball material; v1The volume of the position indicating rod in the slurry; v2The volume of the buoyancy ball in the slurry; r is1Is the outer radius of the position indicating rod; r is2Is the inner radius of the position indication rod; r1The outer radius of the buoyancy sphere; r2Is the inner radius of the buoyancy sphere; l0The length of the position indicating rod is; g is the acceleration of gravity.
In one embodiment, the indicator rod is located at a mud length of 1.4 m; the weight of the position indicating rod and the buoyancy ball is as follows:
m1＝π(r1 2-r2 2)l0ρ2＝1.813kg
Figure BDA0002745296100000052
the initial buoyancy of the position indicating rod and the buoyancy ball is as follows:
F1＝ρ1V1g＝21.11
F2＝ρ1V2g＝10.86
thus, it is possible to provide
m1g+m2g＝34.68N
Therefore, it is
m1g+m2g≈1.08(F1+F1)
Namely, in the initial state, the whole weight of the cast-in-place pile top cast-in-place height control device is slightly larger than the buoyancy generated by mud.
2) Fixing the guide rings 4 on the main reinforcement 1 of the reinforcement cage of the cast-in-place pile, adjusting the two guide rings 4 to be parallel and ensuring the centers of the hollow circular rings at one end to be on the same vertical line;
3) the position indicating rod 2 penetrates through a hollow circular ring at one end of a guide ring 4, and a buoyancy ball 3 is arranged at the bottom of the position indicating rod 2;
4) opening the positioning clamp 5 clamping piece on the position indicating rod, gradually lowering the position indicating rod 2 until the positioning clamp 5 clamping piece at the upper end of the position indicating rod 2 is contacted with a circular ring at one end of the guide ring 4;
5) pouring underwater concrete of the cast-in-place pile;
6) when the top surface of the concrete is contacted with the buoyancy ball 3, the concrete moves upwards against the buoyancy ball 3, and the position indicating rod 2 moves upwards;
7) when a blue reflective film 6 on the position indicating rod 2 is observed, the concrete pouring condition is closely noticed; when the yellow reflective film 7 on the position indicating rod 2 is observed, preparing to stop pouring concrete; and when the red reflecting film 8 on the position indicating rod 2 is observed, stopping pouring concrete, and finishing the underwater concrete pouring construction of the cast-in-place pile.
The control device is simple in manufacturing principle, the pile top concrete pouring height of the underwater cast-in-place pile can be accurately controlled by utilizing the self weight of the material and the buoyancy relation of the material in slurry, and compared with the conventional control effect of the pouring height of the underwater cast-in-place pile, the average over-pouring height of the underwater cast-in-place pile can be reduced by 15-25 cm after the control device is implemented. The invention has wide application range, is suitable for different types of underwater cast-in-place piles and underwater diaphragm wall construction, and can not be influenced by the construction environment in the control process and the normal construction flow. The invention has simple structure, convenient operation, flexible assembly and disassembly, the assembly and disassembly time is not more than 2 minutes, the operation method is simple and understandable, and common workers can use the device after simple demonstration without special training.
In order to further illustrate that the device for controlling the pile top pouring height of the underwater concrete pouring pile of the present invention has low manufacturing cost, table 1 shows the manufacturing cost of the device for controlling the pile top pouring height of the underwater concrete pouring pile in example 1. As can be seen from table 1, the manufacturing cost of the pile top pouring height control device of the underwater concrete pouring pile is only 138.6 yuan, and if the device is produced in batch, the cost price can be reduced by 10-20%.
TABLE 1 cost of manufacture of pile top pouring height control device for underwater concrete pouring pile (including processing fee)
Figure BDA0002745296100000061
Figure BDA0002745296100000071
In order to further explain the effectiveness of the device and the method for controlling the pile top pouring height of the underwater concrete pouring pile, table 2 shows the super pouring height of 6 underwater concrete pouring piles in the Shenzhen Shenhai trading plaza foundation pit project. As can be seen from table 2, the average value of the over-filling height of 6 cast-in-place piles without the device and the method for controlling the pile top filling height of the underwater concrete cast-in-place pile is 76.7cm, the dispersion of the over-filling height value is large, the over-filling of p3 cast-in-place piles is 61.6cm, and the over-filling of p6 cast-in-place piles is 92.5 cm; the pile top pouring height control device and the control method of the underwater concrete pouring pile have the advantages that the average value of the over pouring height of 6 pouring piles is 58.4cm, the over pouring height is reduced by 18.3cm compared with the average value of the over pouring height of the pouring piles which are not adopted, and the over pouring height value of each pouring pile is small in dispersion. The beneficial effects of the pile top pouring height control device and the control method of the underwater concrete pouring pile in the practical engineering application are fully explained above.
Table 2 super-grouting height of pile top of underwater concrete pouring pile (for example, Shenzhen fore-sea trading square foundation pit project)
Figure BDA0002745296100000072
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (8)

1. A pile top pouring height control device for an underwater concrete pouring pile is characterized by comprising a position indicating rod, a buoyancy ball, a guide ring, a positioning clamp and a three-color light reflecting film; the position indicating rod is arranged on one side of a main reinforcement of the reinforcement cage of the cast-in-place pile in parallel through the guide ring, the buoyancy ball is positioned at the bottom of the position indicating rod, and the three-color reflective films are sequentially arranged up and down along the position indicating rod; the anti-sinking positioning clamp is arranged above the position indicating rod;
the initial positioning of the position indicating rod in a mud layer is controlled through the buoyancy of the buoyancy ball and the position indicating rod in mud, the liquid level of the cast-in-place concrete rises until the cast-in-place concrete is contacted with the buoyancy ball, the position indicating rod is pushed to gradually vertically rise, and the cast-in-place condition of the pile top of the cast-in-place concrete pile is determined by observing reflective films with different colors.
2. The pile top pouring height control device of the underwater concrete pouring pile as claimed in claim 1, wherein the position indicating rod is a light hollow aluminum alloy rod, and the bottom of the position indicating rod is provided with an external thread.
3. The pile top pouring height control device of the underwater concrete pouring pile as claimed in claim 1, wherein the buoyancy ball is a sphere with a hollow middle part and an internal thread at an upper opening, and the internal thread at the upper part of the buoyancy ball is connected with the external thread at the bottom of the position indicating rod in a matching manner.
4. The pile top pouring height control device of the underwater concrete pouring pile as claimed in claim 1, wherein the three-color reflective films are respectively a blue reflective film, a yellow reflective film and a red reflective film from top to bottom in sequence.
5. The pile top pouring height control device for the underwater concrete pouring pile according to claim 1, wherein the positioning clamp comprises a fixing part fixed on the position indicating rod and a clamping piece hinged to the fixing part and embedded in the fixing part, the clamping piece is a limiting clamping piece, and the clamping piece can only rotate 90 degrees when being opened along the fixing part.
6. The pile top pouring height control device of the underwater concrete pouring pile as claimed in claim 1, wherein one end of the guide ring is provided with a buckle, the other end of the guide ring is a hollow circular ring, and the guide ring is fixed on a main reinforcement of the reinforcement cage through the buckle.
7. The method for controlling the pile top pouring height of the underwater concrete pouring pile of any one of the devices of claims 1-6 is characterized by comprising the following steps:
1) determining the initial state of the position indicating rod, and determining the buoyancy of the buoyancy ball and the position indicating rod in the mud layer;
2) fixing the guide rings on the main reinforcement of the reinforcement cage of the cast-in-place pile, adjusting the two guide rings to be parallel and ensuring the centers of the hollow circular rings at one end of the guide rings to be on the same vertical line;
3) the position indicating rod penetrates through a hollow circular ring at one end of the guide ring, and a buoyancy ball is arranged at the bottom of the position indicating rod;
4) gradually lowering the position indicating rod until the positioning clamp at the upper end of the position indicating rod is contacted with a circular ring at one end of the guide ring;
5) pouring underwater concrete of the cast-in-place pile;
6) when the top surface of the concrete is contacted with the buoyancy ball, the concrete pushes the buoyancy ball to move upwards, and the position indicating rod moves upwards;
7) when a blue reflective film on the position indicating rod is observed, the concrete pouring condition is closely noticed; when a yellow reflective film on the position indicating rod is observed, preparing to stop pouring concrete; and when the red reflecting film on the position indicating rod is observed, stopping pouring concrete, and finishing the underwater concrete pouring construction of the cast-in-place pile.
8. The method for controlling the pile top pouring height of an underwater concrete pouring pile according to claim 7, wherein the mass and the initial buoyancy of the position indicating rod and the buoyancy ball are determined by the following formula:
m1g+m2g＝1.02(F1+F2)～1.1(F1+F2) (1)
F1＝ρ1V1g (2)
F2＝ρ1V2g (3)
Figure FDA0002745296090000021
Figure FDA0002745296090000022
in the formula, m1Mass of the position indicating rod; m is2Is the mass of the buoyant spheres; f1The buoyancy of the slurry to a position indicating rod immersed in the slurry; f2Is the buoyancy of the mud to the buoyancy ball; rho1Is the slurry density; rho2Is the material density of the position indicating rod; rho3Is the density of the buoyancy ball material; v1The volume of the position indicating rod in the slurry; v2The volume of the buoyancy ball in the slurry; r is1Is the outer radius of the position indicating rod; r is2Is the inner radius of the position indication rod; r1The outer radius of the buoyancy sphere; r2Is the inner radius of the buoyancy sphere; l0The length of the position indicating rod is; g is the acceleration of gravity.
CN202011164235.6A 2020-10-27 2020-10-27 Pile top pouring height control device and method for underwater concrete pouring pile Pending CN112323804A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204385781U (en) * 2014-11-28 2015-06-10 湖北中南勘察基础工程有限公司 A kind of device measuring the underwater gliders face degree of depth
CN106013160A (en) * 2016-06-29 2016-10-12 江苏中海昇物联科技有限公司 Cast-in-place concrete pile grouting height control device and using method thereof
JP2017150163A (en) * 2016-02-22 2017-08-31 清水建設株式会社 Measurement method for casting height of underwater inseparable concrete/mortar
CN108396734A (en) * 2018-04-29 2018-08-14 广西建工集团第三建筑工程有限责任公司 A kind of device of control Punching Borehole Cast-in-place Concrete Pile stake top concrete casting elevation
CN111218933A (en) * 2020-01-15 2020-06-02 中国十七冶集团有限公司 Early warning device for excess concrete filling amount of cast-in-place pile and using method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204385781U (en) * 2014-11-28 2015-06-10 湖北中南勘察基础工程有限公司 A kind of device measuring the underwater gliders face degree of depth
JP2017150163A (en) * 2016-02-22 2017-08-31 清水建設株式会社 Measurement method for casting height of underwater inseparable concrete/mortar
CN106013160A (en) * 2016-06-29 2016-10-12 江苏中海昇物联科技有限公司 Cast-in-place concrete pile grouting height control device and using method thereof
CN108396734A (en) * 2018-04-29 2018-08-14 广西建工集团第三建筑工程有限责任公司 A kind of device of control Punching Borehole Cast-in-place Concrete Pile stake top concrete casting elevation
CN111218933A (en) * 2020-01-15 2020-06-02 中国十七冶集团有限公司 Early warning device for excess concrete filling amount of cast-in-place pile and using method

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Application publication date: 20210205