CN111663524A

CN111663524A - Cast-in-place pile pouring elevation monitoring device and construction method thereof

Info

Publication number: CN111663524A
Application number: CN202010676354.3A
Authority: CN
Inventors: 李栋伟; 蒋潇伊; 鹿庆蕊
Original assignee: East China Institute of Technology
Current assignee: East China Institute of Technology
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-09-15

Abstract

The invention discloses a cast-in-place pile casting elevation monitoring device and a construction method thereof, belonging to the technical field of civil engineering, and the cast-in-place pile casting elevation monitoring device comprises: the outer wall of the guide pipe is provided with an upper capacitor plate; the inner wall of the sleeve is provided with a lower capacitor plate, the sleeve is sleeved on the outer wall of the guide pipe, the upper capacitor plate is positioned in the sleeve, and the upper capacitor plate is parallel to the lower capacitor plate; the one end and the sheathed tube outer wall connection of separation plate, the other end pass through connecting rod and sleeve pipe top fixed connection, are equipped with the hole of permeating water on the separation plate. This bored concrete pile pours elevation monitoring devices is through setting up the electric capacity board on the outer wall of pipe, is provided with down the electric capacity board on the sheathed tube inner wall, is provided with the separation plate on the sheathed tube bottom outer wall, when the concrete upwards promoted the sleeve pipe, makes the electric capacity board that makes progress down be close to, and the universal meter registration that is connected to between electric capacity board and the lower electric capacity board this moment changes, explains that the height of separation plate has been pour to the concrete.

Description

Cast-in-place pile pouring elevation monitoring device and construction method thereof

Technical Field

The invention relates to the technical field of civil engineering, in particular to a cast-in-place pile pouring elevation monitoring device and a construction method thereof.

Background

In recent decades, with the development of the construction industry, super high-rise buildings are more and more in China, and when the super high-rise buildings appear in places with poor soil quality, pile foundations need to be adopted, the pile diameters of general pile foundations are large, and the application ratio of cast-in-place piles is relatively large. Two problems mainly exist in the process of constructing the concrete cast-in-place pile. One is that the control of the height of the concrete over-poured on the top of the pile is a very difficult problem. The excessive irrigation amount is large, so that concrete is wasted, the cost required by pile cutting is indirectly increased, resource waste is caused, and the material consumption is increased; if the excessive irrigation amount is less, the pile head contains a large amount of mortar and even soil, the construction quality of the pile head cannot be guaranteed, the design grade cannot be reached, and therefore reinforcement treatment is needed, and the construction process is complex. At present, the traditional construction method is basically adopted at home and abroad, namely, the distance from the pile top to the pile casing is measured by using a measuring rope to control the over-irrigation height (the over-irrigation height is not less than 50cm of the standard height of the pile top). Secondly, how to control the burial depth of the guide pipe, namely how to strictly control the lifting speed of the guide pipe, if the lifting speed is too high, a floating slurry layer is positioned at the bottom of the pile or in the middle of the pile body, mud clamping or pile breaking is formed, and the quality of the pile body cannot meet the requirement; if the guide pipe is accelerated slowly, the pouring speed is high, more aggregate is easy to deposit at the deep part of the hole body, and the strength of the upper part of the pile body is also easy to be low due to the segregation of concrete in the vibrating process. Therefore, reasonably controlling the lifting speed of the guide pipe is an important step for avoiding major engineering quality accidents such as pile breakage, weak piles and the like. At present, the traditional construction method is basically adopted at home and abroad, namely, the length from the concrete pouring surface in the pile foundation to the top opening of the guide pipe is measured by using a measuring rope, then the buried depth of the guide pipe is obtained by subtracting the measured length from the length of the guide pipe, and meanwhile, the super-pouring height can also be obtained. Wherein the depth of the conduit embedded in the concrete is typically 2 to 6 m. The height of the super-irrigation is generally 0.5-1 m.

However, the conventional construction method has the following problems: the rope quality is measured, and the measured data is not accurate enough; the measuring rope and the reinforcing steel bar head or the bamboo pole are adopted for measurement, the influence degree of the experience of people is large, and accurate measurement cannot be achieved. This conventional approach faces the following problems:

problems with super irrigation: 1. the pile is supplemented in the later period, the cost is extremely high, and the quality and the progress are influenced; 2. the over-irrigation is that the pile is cut at the later stage, which wastes materials and labor, has high cost and influences the progress; 3. environmental protection, no energy conservation, high garbage disposal cost and environmental influence caused by waste disposal.

The problem caused by the fact that the catheter pulling speed is not well controlled is as follows: if the speed is accelerated too fast, the floating slurry layer is positioned at the bottom of the pile or in the middle of the pile body, mud is clamped or the pile is broken, and the quality of the pile body cannot meet the requirement; if the guide pipe is accelerated slowly, the pouring speed is high, more aggregates are easy to deposit at the deep part of the hole body, and simultaneously, the strength of the upper part of the pile body is low due to the segregation of concrete in the vibrating process.

Therefore, how to provide a cast-in-place pile casting height monitoring device capable of monitoring the concrete casting height, avoiding less casting and over casting and further improving the cast-in-place pile casting quality is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a cast-in-place pile casting elevation monitoring device which can detect the casting height in the concrete casting process, avoid less casting and over casting and further improve the casting quality of a cast-in-place pile.

In order to achieve the purpose, the invention adopts the following technical scheme:

an elevation monitoring device is pour to bored concrete pile includes:

the outer wall of the guide pipe is provided with an upper capacitor plate;

the inner wall of the sleeve is provided with a lower capacitor plate, the sleeve is sleeved on the outer wall of the guide pipe, the upper capacitor plate is positioned in the sleeve, and the upper capacitor plate is parallel to the lower capacitor plate;

one end of the separation plate is connected with the outer wall of the sleeve, the other end of the separation plate is fixedly connected with the top end of the sleeve through a connecting rod, and a water permeable hole is formed in the separation plate;

the upper capacitor plate and the lower capacitor plate are both provided with wires, and the wires are used for measuring the capacitance between the upper capacitor plate and the lower capacitor plate.

The beneficial effect of adopting above-mentioned technical scheme is: the outer wall of the guide pipe is provided with the capacitance plate, the outer wall of the guide pipe is sleeved with the sleeve, the inner wall of the sleeve is provided with the lower capacitance plate, the outer wall of the bottom end of the sleeve is provided with the separation plate, when concrete is poured into the bottom of the pile from the guide pipe, after the elevation of the concrete is contacted with the separation plate, as the concrete is still poured, water in the concrete can pass through the water permeable holes at the moment, but the concrete is blocked below the separation plate, under the pushing of the concrete, the outer edge of the separation plate rotates upwards, the force generated by the rotation is transmitted to the top end of the sleeve through the connecting rod, the sleeve further slides upwards along the guide pipe, the lower capacitance plate is enabled to approach the upper capacitance plate, the capacitance indication number on a universal meter connected between the upper capacitance plate and the lower capacitance plate is changed at the moment, the height that the concrete is poured to the separation plate is further explained, and the pouring height of the concrete can be calculated, the device has the advantages of simple structure, low cost and high sensitivity, and can quickly display on the multimeter as long as the distance between the upper capacitor plate and the lower capacitor plate is changed.

Further, follow on the outer wall of pipe the pipe axial is equipped with the guide way, the guide way is located the below of electric capacity board down, the fixed pulley that is provided with on the sheathed tube inner wall, the pulley with the guide way adaptation.

The beneficial effect of adopting above-mentioned technical scheme is: through being equipped with the guide way on the outer wall of pipe, and be equipped with the pulley with the guide way adaptation on sheathed tube inner wall, can guarantee under the effect of separator plate pivoted that the sleeve pipe upwards slides along fixed direction.

Further, the separation plate includes a plurality of push pedals, and is a plurality of the push pedal is axle array arrange in sheathed tube outside and all with sheathed tube outer wall connection, and it is a plurality of the push pedal is kept away from sheathed tube one end pass through the connecting rod with the top fixed connection of pipe.

The beneficial effect of adopting above-mentioned technical scheme is: through setting up the separation plate into a plurality of push plates, can guarantee that each push plate is under the effect of pile bottom concrete, when the elevation of concrete reachs the push plate, the push plate can the rapid response, keeps away from sheathed tube one end and can upwards rotate along with the height of concrete.

Furthermore, end covers are arranged between the two ends of the sleeve and the guide pipe, the outer edge of each end cover is fixedly connected with the sleeve, and the inner edge of each end cover is attached to the guide pipe. The inner cavity of the sleeve can form a closed space through the connection of the end covers, and water is prevented from entering the sleeve when the universal meter works in an underwater environment, so that the relative dielectric constant between the upper capacitor plate and the lower capacitor plate is changed, and the measurement precision of the universal meter is further influenced.

Further, the inner edge of the end cover is provided with a rubber sealing coating. The rubber sealing coating is arranged on the surface of the inner edge, so that the sealing performance between the end cover and the guide pipe can be ensured, and water is prevented from entering the inside of the sleeve when the underwater environment works.

The second purpose of the invention is to provide a construction method of the cast-in-place pile casting elevation monitoring device, which can detect the casting height in the concrete casting process, avoid short casting and over casting and further improve the casting quality of the cast-in-place pile.

The invention provides a construction method of a cast-in-place pile pouring elevation monitoring device, which comprises the following steps:

s10, the sleeve and the guide pipe are installed together, and the push plate is installed on the outer wall of the sleeve, so that a parallel plate capacitor is formed between the upper capacitor plate on the outer wall of the guide pipe and the lower capacitor plate on the inner wall of the sleeve;

s20, connecting the universal meter with the wires reserved on the upper capacitor plate and the lower capacitor plate;

s30, connecting the guide pipes installed in the S10 one by one through a plurality of connecting pipes and putting the guide pipes into pile holes needing to be poured;

s40, pouring concrete into the connecting pipe, wherein the concrete flows to the pile bottom along the inner walls of the connecting pipe and the guide pipe;

s50, when the height of the concrete reaches the position of the push plate, because the concrete is continuously poured at the moment, the concrete pushes the outer edge of the push plate to rotate upwards around the joint of the inner edge and the sleeve, so that the sleeve is driven to move upwards, the lower capacitor plate on the inner wall of the sleeve is close to the upper capacitor plate, and the reading of the universal meter is obviously changed;

s60, when the indication number of the universal meter changes, the guide pipe is lifted upwards by the height of a connecting pipe, at the moment, the concrete is separated from the push plate, the push plate and the sleeve return to the horizontal state under the action of power, and the sleeve returns to the original state;

and S70, repeating the steps S40-S60 until the concrete pouring height reaches the preset height.

The construction method of the cast-in-place pile pouring elevation monitoring device provided by the invention has the beneficial effects that: the cast-in-place pile casting height monitoring device is implemented in the construction method, wherein the specific structure, connection relation, beneficial effects and the like of the cast-in-place pile casting height monitoring device are explained in detail in the above texts, and are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating an overall structure of a cast-in-place pile casting elevation monitoring device according to the present invention;

FIG. 2 is a schematic view of a cross-sectional structure A-A provided in the present invention;

fig. 3 is a schematic diagram of a separation plate structure provided by the present invention.

In the figure: 1 is a conduit; 2 is a sleeve; 3 is a separating plate; 31 are water permeable holes; 32 is a push plate; 4 is a connecting rod; 5 is a lead; 6 is an end cover; 7 is an upper capacitor plate; 8 is a lower capacitor plate; 9 is a guide groove; and 10 is a pulley.

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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to the accompanying drawings 1-3, the embodiment of the invention discloses a cast-in-place pile casting elevation monitoring device, which comprises:

the connecting pipe comprises a pipe 1, wherein an upper capacitor plate 7 is arranged on the outer wall of the pipe 1, the upper capacitor plate 7 is fixedly connected with the outer wall of the pipe 1, an external thread section is arranged at the upper end of the pipe 1 and is used for connecting the pipe 1 with a connecting pipe through threads, one end of the connecting pipe is arranged to be an external thread structure, the other end of the connecting pipe is arranged to be an internal thread structure, internal threads of the connecting pipe can be connected with the external threads of the pipe 1, a plurality of connecting pipes can be sequentially connected end to end through the internal and external threads at two ends, one end of the connecting pipe at the final end is provided;

the device comprises a sleeve 2, wherein a lower capacitor plate 8 is arranged on the inner wall of the sleeve 2, the lower capacitor plate 8 is fixedly connected with the inner wall of the sleeve 2, the sleeve 2 is sleeved on the outer wall of a guide pipe 1, an upper capacitor plate 7 is positioned inside the sleeve 2, and the upper capacitor plate 7 and the lower capacitor plate 8 are parallel to form a parallel plate capacitor;

wherein, there is the clearance in the outward flange of going up condenser plate 7 and the inner wall of sleeve pipe 2, there is the clearance in the outer wall of lower condenser plate 8 and pipe 1, the last fixed surface of going up condenser plate 7 is connected with wire 5, the lower surface of lower condenser plate 8 is connected with wire 5, the wire 5 of being connected with lower condenser plate 8 passes the clearance between the outer wall of lower condenser plate 8 and pipe 1 and the clearance between the outward flange of going up condenser plate 7 and the inner wall of sleeve pipe 2 in proper order, wire 5 stretches out end cover 6 and the universal meter connection of sleeve pipe 2 upper end.

Separation plate 3, the one end and the outer wall connection of sleeve pipe 2 of separation plate 3, its other end pass through connecting

rod

4 and 2 top fixed connection of sleeve pipe, are equipped with the hole 31 of permeating water on separation plate 3.

Specifically, be equipped with guide way 9 along pipe 1 axial on pipe 1's the outer wall, guide way 9 locates the below of lower electric capacity board 8, in this embodiment, guide way 9 sets up four, and four guide way 9 interval arrangements, the contained angle between two adjacent guide ways 9 is 90, and the fixed pulley 10 that is provided with on the inner wall of sleeve pipe 2, pulley 10 also is provided with four, four pulley 10 and four guide way 9 one-to-one, and pulley 10 and guide way 9 adaptation, pulley 10 can slide from top to bottom at pipe 1's outer wall along guide way 9, in other embodiments, the quantity of guide way 9 and pulley 10 can set up according to actual demand.

Specifically, the separation plate 3 includes a plurality of push pedal 32, and a plurality of push pedal 32 are axle array and arrange in the outside of sleeve 2 and all with sleeve 2's outer wall connection, and the top fixed connection of connecting rod 4 and pipe 1 is passed through to the one end that sleeve 2 was kept away from to a plurality of push pedal 32, and in this embodiment, push pedal 32 sets up to four, and every push pedal 32 is 90 fan-shaped, is equipped with a plurality of holes 31 of permeating water on the push pedal 32, exists the parting joint between two adjacent push pedal 32.

Specifically, end covers 6 are arranged between two ends of the casing 2 and the conduit 1, the outer edge of each end cover 6 is welded with the inner wall of the casing 2, the inner edge of each end cover 6 is attached to the conduit 1, and the inner edge of each end cover 6 is provided with a rubber sealing coating.

The embodiment of the invention discloses a construction method for implementing a cast-in-place pile casting elevation monitoring device in the embodiment 1, which comprises the following steps:

The construction method of the cast-in-place pile casting elevation monitoring device disclosed in the above embodiment is specifically operated as follows: for example, the length of the conduit is 6m, the connecting pipes are all 3m, the separating plate is arranged at a position 4m away from the lower end of the conduit, when the reading of the multimeter is changed for the first time, the concrete height is 4m, and the buried depth of the conduit is 4 m; the guide pipe can be pulled upwards until the first connecting pipe is detached, and the connecting pipes are all 3m, so that when the guide pipe is pulled upwards for 3m, the buried depth of the guide pipe is still 1m, and the condition that the concrete is pulled out from the guide pipe cannot occur. Because the push plate is not forced upwards by concrete after the guide pipe is pulled upwards, the push plate returns to the horizontal state and the sleeve returns to the initial position. When the second reading of the multimeter is changed, the buried depth of the conduit is changed from 1m to 4m, namely the concrete elevation is increased by 3m, the total elevation is 7m, then the step of pulling out the conduit is repeated, and the multimeter counts once again at the same time, namely counts twice. The subsequent concrete elevation H-4 + multimeter counts 3.

To further illustrate the present invention, the following examples are provided for illustration.

Example 1

Referring to fig. 1 and 2, the invention discloses a cast-in-place pile casting elevation monitoring device, which comprises:

the connecting pipe comprises a pipe 1, wherein an upper capacitor plate 7 is arranged on the outer wall of the pipe 1, the upper capacitor plate 7 is fixedly connected with the outer wall of the pipe 1, an external thread section is arranged at the upper end of the pipe 1 and is used for connecting the pipe 1 with a connecting pipe through threads, one end of the connecting pipe is arranged to be an external thread structure, the other end of the connecting pipe is arranged to be an internal thread structure, internal threads of the connecting pipe can be connected with the external threads of the pipe 1, a plurality of connecting pipes can be sequentially connected end to end through the internal and external threads at two ends, one end of the connecting pipe at the final end is;

Separation plate 3, separation plate 3's one end and sleeve pipe 2's outer wall fixed connection, its other end pass through connecting

rod

4 and 2 top fixed connection of sleeve pipe, are equipped with the hole 31 of permeating water on separation plate 3, and in this embodiment, separation plate 3 is a whole board.

Specifically, be equipped with guide way 9 along pipe 1 axial on pipe 1's the outer wall, guide way 9 locates the below of lower electric capacity board 8, in this embodiment, guide way 9 sets up four, and four guide ways 9 interval arrangement, the contained angle between two adjacent guide ways 9 is 90, and the fixed pulley 10 that is provided with on the inner wall of sleeve pipe 2, pulley 10 also is provided with four, four pulley 10 and four guide ways 9 one-to-one, and pulley 10 and guide way 9 adaptation, pulley 10 can slide from top to bottom at pipe 1's outer wall along guide way 9, in other embodiments, guide way 9 and pulley 10 can set up the quantity according to actual demand.

Specifically, end covers are arranged between two ends of the sleeve 2 and the guide pipe 1, the outer edge of the end cover 6 is welded with the inner wall of the sleeve 2, the inner edge of the end cover 6 is attached to the guide pipe 1, and the inner edge of the end cover 6 is provided with a rubber sealing coating.

The working principle is as follows: the concrete is injected into the pile bottom from the connecting pipe at the top end, the guide pipe is wrapped by the concrete after a period of time, when the elevation of the concrete reaches a certain height, the concrete contacts the separating plate and then continues to be injected, so the separating plate can move upwards under the pushing of the concrete, the lower capacitor plate is fixed on the inner wall of the sleeve because the separating plate is fixed with the outer wall of the sleeve, the separating plate moves the sleeve and the lower capacitor plate together to move upwards, meanwhile, the upper capacitor plate fixed on the outer wall of the guide pipe does not move upwards because the guide pipe does not move upwards, therefore, in the process of the upward movement of the separating plate, the distance between the lower capacitor plate and the upper capacitor plate changes, and according to a formula, the distance between the lower capacitor plate and the upper capacitor plate also changes

It can be seen that when the distance between the upper and lower capacitive plates changes, the multimeter's reading will change rapidly, while the multimeter will count once. Therefore, as long as the reading of the multimeter is obviously changed, the concrete height reaches the height of the separating plate, and meanwhile, the pouring height of the concrete column can be calculated.

Example 2

Referring to the accompanying drawings 1-3, the invention discloses a cast-in-place pile pouring elevation monitoring device, which comprises:

the connecting pipe comprises a pipe 1, wherein an upper capacitor plate 7 is arranged on the outer wall of the pipe 1, the upper capacitor plate 7 is fixedly connected with the outer wall of the pipe 1, an external thread section is arranged at the position, close to the upper end, of the pipe 1 and used for connecting the pipe 1 and a connecting pipe through threads, one end of the connecting pipe is arranged to be of an external thread structure, the other end of the connecting pipe is arranged to be of an internal thread structure, internal threads of the connecting pipe can be connected with the external threads of the pipe 1, the connecting pipes can be sequentially connected end to end through the internal threads and the external threads at the two ends, the connecting pipe at the tail;

And one end of the separation plate 3 is pivotally connected with the outer wall of the sleeve 2, the other end of the separation plate 3 is fixedly connected with the top end of the sleeve 2 through a connecting rod 4, and a water permeable hole 31 is formed in the separation plate 3.

Specifically, the separation plate 3 includes a plurality of push plates 32, and a plurality of push plates 32 are axle array and arrange in the outside of sleeve 2 and all with sleeve 2's outer wall pivot connection, and the top fixed connection of connecting rod 4 and pipe 1 is passed through to the one end that sleeve 2 was kept away from to a plurality of push plates 32, and in this embodiment, push plates 32 set up to four, and every push plate 32 is 90 fan-shaped, is equipped with a plurality of holes 31 of permeating water on the push plate 32, exists the parting joint between two adjacent push plates 32.

The working principle is as follows: the concrete is injected into the pile bottom from the connecting pipe at the top end, the guide pipe is wrapped by the concrete after a period of time, when the elevation of the concrete reaches a certain height, the concrete contacts the separating plate and then continues to be injected, therefore, four push plates are pushed by the concrete, the outer edge of each push plate rotates upwards around the pivot joint of the push plate and the sleeve, the sleeve is driven to move upwards through the connecting rod between the upper end of the sleeve and the push plate, meanwhile, the upper capacitor plate fixed on the outer wall of the guide pipe does not move upwards because the guide pipe does not move upwards, the lower capacitor plate is fixed on the inner wall of the sleeve, therefore, in the upward movement process of the sleeve, the lower capacitor plate also changes along with the upward movement and the distance between the upper capacitor plate according to a formula

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a bored concrete pile pours elevation monitoring devices which characterized in that includes:

the device comprises a guide pipe (1), wherein an upper capacitance plate (7) is arranged on the outer wall of the guide pipe (1);

the device comprises a sleeve (2), wherein a lower capacitance plate (8) is arranged on the inner wall of the sleeve (2), the sleeve (2) is sleeved on the outer wall of the guide pipe (1), the upper capacitance plate (7) is positioned in the sleeve (2), and the upper capacitance plate (7) is parallel to the lower capacitance plate (8);

one end of the separation plate (3) is connected with the outer wall of the sleeve (2), the other end of the separation plate (3) is fixedly connected with the top end of the sleeve (2) through a connecting rod (4), and a water permeable hole (31) is formed in the separation plate (3);

go up condenser plate (7) with all be equipped with wire (5) on condenser plate (8) down, wire (5) are used for measuring go up condenser plate (7) with the electric capacity between condenser plate (8) down.

2. The cast-in-place pile casting height monitoring device according to claim 1, wherein a guide groove (9) is axially formed in the outer wall of the guide pipe (1) along the guide pipe (1), the guide groove (9) is formed below the lower capacitor plate (8), a pulley (10) is fixedly arranged on the inner wall of the sleeve (2), and the pulley (10) is matched with the guide groove (9).

3. The cast-in-place pile casting elevation monitoring device according to claim 1, wherein the separation plate (3) comprises a plurality of push plates (32), the push plates (32) are arranged outside the casing (2) in an axial array manner and are all connected with the outer wall of the casing (2), and one ends, far away from the casing (2), of the push plates (32) are fixedly connected with the top end of the guide pipe (1) through connecting rods (4).

4. The cast-in-place pile casting elevation monitoring device according to claim 1, wherein end covers are arranged between two ends of the sleeve (2) and the guide pipe (1), the outer edge of each end cover (6) is fixedly connected with the sleeve (2), and the inner edge of each end cover (6) is attached to the guide pipe (1).

5. Cast-in-place pile casting elevation monitoring device according to claim 1, wherein the inner edge of the end cover (6) is provided with a rubber sealing coating.

6. The construction method of the cast-in-place pile casting elevation monitoring device according to any one of claims 1 to 5, wherein the construction method comprises the following steps: