Pipe pile core gas lift slag removal device

Abstract

The invention belongs to the technical field of pile foundation engineering, and discloses a tubular pile core gas lift slag removal device which comprises a gas conveying steel pipe, a jet flow nozzle, a guide support, a high-pressure gas pump and a connecting hose. The gas transmission steel pipe is formed by rigidly connecting a vertical steel pipe and a top end horizontal steel pipe, the bottom end of the vertical steel pipe is connected with a jet nozzle, a guide bracket is arranged on the periphery of the vertical steel pipe, and the horizontal steel pipe is hung on the pile top to control the maximum slag removal depth; according to the slag removal principle of the device, after the pipe pile is cut, the vertical steel pipe is inserted into the pipe pile, the high-pressure air pump conveys high-pressure air to the jet flow nozzle through the connecting hose, the jet flow nozzle sprays high-pressure air flow to cut and crush slag in a pipe pile cavity, and meanwhile the air flow upwards flows back in the pipe pile cavity to lift and carry the slag to the pile top; the function of cleaning muck in a tubular pile cavity is achieved; muck in the tubular pile cavity can be rapidly removed, it is guaranteed that the inner wall of the tubular pile is clean, the process principle is simple, and implementation is efficient and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation engineering, and in particular to an air lift slag cleaning device for a pipe pile core. Background Art

[0002] As a kind of precast concrete pile, prestressed concrete pipe pile has the characteristics of high single pile bearing capacity, low unit bearing capacity cost, fast construction speed, reliable pile quality, etc. It is widely used in construction, railway, highway, bridge and other projects. Since the general construction process of prestressed concrete pipe pile belongs to soil squeezing pile, in order to reduce the static pressure of pipe pile or the soil squeezing effect during the process of hammering pile sinking, the lower end of the pile is usually open, that is, no pile tip is set, so a large amount of soil will be squeezed into the cavity from the hollow part of the pipe pile during the pile sinking process. In extreme cases, the soft soil layer can even surge from the hollow part of the pipe pile to the top of the pile.

[0003] For pull-out resistant pipe piles or pipe piles with earthquake-resistant design, the industry specification has requirements for concrete core filling. Therefore, before the core filling operation of prestressed concrete pipe piles, the debris in the pipe cavity within the core filling depth range should be cleared in advance and the inner wall of the official cavity should be kept clean, and the expansion concrete core should be used as a structural anti-seepage measure for prestressed concrete pipe piles.

[0004] At present, the methods for cleaning the slag in the concrete pile cavity are usually: manual slag removal with simple scoop-shaped tools, water reverse circulation flushing to carry the slag, mechanically driven spiral shovel to take the soil, etc. Manual slag removal is not only inefficient, but also has many unsafe factors, and it is not easy to clean the inner wall of the pile. Water reverse circulation flushing not only pollutes the construction site, but also has problems such as the inner wall of the pile is not cleaned. There is a construction gap between the spiral shovel taking soil and the inner wall of the pile, which not only increases the cost, but also has the problem of the inner wall of the pile not being cleaned. Summary of the invention

[0005] The present invention aims to provide a pipe pile core air lift slag cleaning device, which solves the above problems by inserting a steel pipe into the pipe pile and pumping high-pressure airflow to cut and crush the slag, and utilizing the high-pressure airflow to lift and carry the slag in the process of returning to the orifice in the pipe pile cavity, while achieving the dual functions of cleaning the slag in the pipe pile cavity and cleaning the inner wall of the pipe pile, which not only greatly reduces the labor intensity on site, but also greatly improves work efficiency, effectively guarantees the construction quality, is relatively low in cost, and has a good engineering implementation effect.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A pipe pile core air lift slag cleaning device comprises an air transmission steel pipe and a high-pressure air pump. The air transmission steel pipe comprises a vertical steel pipe and a horizontal steel pipe. The vertical steel pipe is rigidly connected to the horizontal steel pipe. The horizontal steel pipe is arranged on the top of the vertical steel pipe. A jet nozzle is connected to the bottom of the vertical steel pipe. A guide bracket is arranged around the vertical steel pipe. The horizontal steel pipe is connected to the high-pressure air pump through a connecting hose.

[0008] Furthermore, both the vertical steel pipe and the horizontal steel pipe are made of seamless steel pipe with an outer diameter of 25 mm. The two sections of steel pipe are rigidly connected by threading. The threads are wrapped with sealing tape and tightened to ensure air tightness.

[0009] Furthermore, the guide bracket is made of 8mm diameter grade I smooth round steel bars bent in an arc and double-sidedly welded to the periphery of the vertical steel pipe.

[0010] Furthermore, the jet nozzle has a circular shape of a jet port, an effective inner diameter of 2 mm, and an inner aperture of the jet nozzle gradually changes from 15 mm to 2 mm of the jet port.

[0011] Furthermore, the jet nozzle and the vertical steel pipe are rigidly connected by threading, and the threads are wrapped with sealing tape and tightened to ensure air tightness.

[0012] Furthermore, multiple rows of guide brackets are arranged above and below the periphery of the vertical steel pipe, with 3 guide brackets in each row, and the horizontal angle between each guide bracket is 120 degrees.

[0013] Furthermore, multiple rows of guide brackets are arranged above and below the periphery of the vertical steel pipe, with 4 guide brackets in each row, and the horizontal angle of each guide bracket is 90 degrees.

[0014] A method for using a pipe pile core air lift slag cleaning device comprises the following steps:

[0015] S1. When the foundation pit is excavated to the designed elevation, the pile heads of the super-high part are cut off, and a working surface is left for cleaning the slag in the pile cavity;

[0016] S2, insert the vertical steel pipe into the pile cavity, and the backstage high-pressure air pump transmits the high-pressure gas to the jet nozzle at the lower end of the vertical steel pipe through the connecting hose;

[0017] S3, the high-pressure gas ejected from the jet nozzle cuts and breaks the dirt in the pile cavity, and the gas flow refluxes upward in the pile cavity to lift and carry the dirt to the top of the pile;

[0018] S4. Adjust the device posture and continue to deepen. When the horizontal steel pipe is suspended on the top of the pipe pile, the device reaches the maximum slag cleaning depth;

[0019] S5. Pull out the device from the pile cavity and repeat the above steps to clean the debris in other pile cavities.

[0020] Principle of the technical solution: The working sequence of the device of the present invention is from shallow to deep. After the device is inserted into the pipe pile cavity, the jet nozzle continuously sprays high-pressure gas to cut and crush the slag in the pipe pile cavity, and the airflow refluxes upward in the pipe pile cavity to lift and carry the slag to the pile top. The posture of the device is continuously and dynamically adjusted to deepen. When the horizontal steel pipe is suspended at the top of the pile, the maximum slag cleaning depth is reached; the guide bracket is arranged around the vertical steel pipe to control the working posture of the vertical steel pipe, and at the same time it has a protective effect on the vertical steel pipe to prevent the vertical steel pipe from hitting the wall and breaking during the slag cleaning process; the horizontal steel pipe is to control the maximum slag cleaning depth and prevent the device from slipping into the pipe cavity.

[0021] The beneficial effects of the technical solution are as follows: the present invention solves the problem of low slag cleaning efficiency of traditional slag cleaning methods by inserting a steel pipe inside the pipe pile and pumping in a high-pressure airflow, and utilizing the high-pressure gas to return to the orifice to lift and carry the slag, while achieving the dual effects of cleaning the inside of the pipe pile and cleaning the inner wall of the pipe pile, which not only greatly improves the efficiency and effect of pipe pile slag cleaning, but also greatly reduces the on-site labor intensity, has no pollution to the construction site, and realizes safe and efficient pipe pile slag cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side cross-sectional view of the slag cleaning process of the device of the present invention;

[0023] Figure 2 Etching plan view of the device of the present invention;

[0024] Figure 3 This is a flow chart of the slag cleaning process of the device of the present invention;

[0025] The names of the corresponding marks in the accompanying drawings are: gas transmission steel pipe 1, jet nozzle 2, guide bracket 3, high-pressure air pump 4, connecting hose 5, pipe pile 6, slag 7, vertical steel pipe 11, horizontal steel pipe 12. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0027] Example:

[0028] like Figure 1-Figure 2 As shown, a gas lift slag cleaning device in the cavity of a pipe pile 6, the device comprises a gas transmission steel pipe 1, a jet nozzle 2, a guide bracket 3, a high-pressure air pump 4 and a connecting hose 5, and also involves a prefabricated pipe pile 6 that needs to be cleaned, and cleaned slag 7. A gas lift slag cleaning device for a pipe pile core: the gas transmission steel pipe 1 is formed by a rigid connection between a vertical steel pipe 11 and a top horizontal steel pipe 12, both of which are made of seamless steel pipes with an outer diameter of 25mm, and the two sections of steel pipes are rigidly connected by threading, and the threads are wrapped with sealing tape and tightened with a specified torque to meet the airtightness requirements.

[0029] The prefabricated pipe pile 6 in this embodiment is used as an anti-pullout pile, and the slag cleaning depth requirement is 3m. Therefore, the length of the vertical steel pipe 11 is 3m, and the length of the top horizontal steel pipe 12 is 0.5m, which meets the requirement of placing the device on the top of the pipe pile 6. The bottom end of the vertical steel pipe 11 is connected with a jet nozzle 2, and the jet nozzle 2 and the vertical steel pipe 11 are also rigidly connected by threading after threading. The thread is wrapped with sealing tape and tightened with a specified torque to meet the airtightness requirement. The height of the jet nozzle 2 is 70mm, and the shape of the jet nozzle 2 is circular, with an effective inner diameter of 2mm. The internal aperture of the jet nozzle 2 gradually changes from 15mm to 2mm of the jet nozzle.

[0030] The high-pressure air pump 4 is connected to the gas delivery steel pipe 1 through the connecting hose 5, and the working high-pressure airflow passes through the connecting hose 5, the horizontal steel pipe 12, and the vertical steel pipe 11, and is finally transmitted to the jet nozzle 2. In this embodiment, the working air pressure of the airflow is 0.6MPa, and the airflow velocity of the jet nozzle 2 is relatively high, which can provide a moderate impact force and range.

[0031] A guide bracket 3 is arranged around the vertical steel pipe 11. The guide bracket 3 is made of Grade I smooth round steel bars with a diameter of 8 mm and bent according to an arc, and is welded on both sides to the periphery of the vertical steel pipe 11. In this embodiment, the guide bracket 3 is arranged in two rows, upper and lower, and each row is provided with four guide brackets 3. The horizontal angle between each guide bracket 3 is 90 degrees. At the same time, each row of guide brackets 3 can also be set to three, and the horizontal angle between each guide bracket 3 is 120 degrees. The guide bracket 3 can reasonably control the working posture of the vertical steel pipe 11, and at the same time has a protective effect on the vertical sense organ to prevent the vertical steel pipe 11 from hitting the wall and breaking during the slag cleaning process.

[0032] The power source of this device is a high-pressure air pump 4. In this embodiment, the high-pressure air pump 4 is driven by a diesel engine and adopts a piston air pump with an output pressure of 0.6MPa. The high-pressure air pump 4 transmits the high-pressure airflow to the jet nozzle 2. The jet nozzle 2 sprays out the high-pressure airflow to cut and crush the slag 7 in the official cavity. At the same time, the gas flows back at the orifice of the pipe pile 6 in the cavity, and carries the slag 7 to the upper end of the pile through air lift. The slag 7 around the pile returning to the upper end of the pile is cleaned and transported out. The specific implementation process is as follows:

[0033] like Figure 3 As shown in the figure, the operation process of a pipe pile core air lift slag cleaning device is as follows:

[0034] S1. When the foundation pit is excavated to the designed elevation, the pile heads of the super-high pipe piles 6 are cut off, and a working surface is left for cleaning the slag in the pipe pile cavity;

[0035] S2, insert the vertical steel pipe 11 into the pile cavity, and the backstage high-pressure air pump 4 transmits the high-pressure gas to the jet nozzle 2 at the lower end of the vertical steel pipe 11 through the connecting hose 5;

[0036] S3, the high-pressure gas ejected from the jet nozzle 2 cuts and breaks the slag 7 in the pipe pile cavity, and the airflow flows upward in the pipe pile cavity to lift and carry the slag 7 to the top of the pipe pile 6;

[0037] S4, adjust the posture of the device and continue to deepen it. When the horizontal steel pipe 12 is suspended on the top of the pipe pile 6, the device reaches the maximum slag cleaning depth;

[0038] S5, pull out the device from the cavity of the pipe pile 6, and repeat the above steps to clean the debris 7 in the cavities of other pipe piles 6.

[0039] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pipe pile core air lift slag cleaning device, characterized in that: The invention comprises a gas transmission steel pipe (1) and a high-pressure air pump (4), wherein the gas transmission steel pipe (1) comprises a vertical steel pipe (11) and a horizontal steel pipe (12), wherein the vertical steel pipe (11) is rigidly connected to the horizontal steel pipe (12), wherein the horizontal steel pipe (12) is arranged at the top of the vertical steel pipe (11), wherein the bottom end of the vertical steel pipe (11) is connected to a jet nozzle (2), wherein a guide bracket (3) is arranged around the vertical steel pipe (11), and wherein the horizontal steel pipe (12) is connected to the high-pressure air pump (4) via a connecting hose (5).

2. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: The vertical steel pipe (11) and the horizontal steel pipe (12) are both made of seamless steel pipe with an outer diameter of 25 mm. The two sections of steel pipe are rigidly connected by threading. The threads are wrapped with sealing tape and tightened with a specified torque to ensure air tightness.

3. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: The guide bracket (3) is made of Class I round steel bars with a diameter of 8 mm, which are bent in an arc and welded on both sides to the periphery of the vertical steel pipe (11).

4. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: The jet nozzle (2) has a circular jet opening with an effective inner diameter of 2 mm, and the inner aperture of the jet nozzle gradually changes from 15 mm to 2 mm of the jet opening.

5. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: The jet nozzle (2) and the vertical steel pipe (11) are rigidly connected by threading, and the threads are wrapped with sealing tape and tightened to ensure air tightness.

6. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: Multiple rows of guide brackets (3) are arranged above and below the periphery of the vertical steel pipe (11), each row of guide brackets (3) has three guide brackets, and the horizontal angle between the guide brackets (3) is 120 degrees.

7. The pipe pile core air lift slag cleaning device according to claim 1, characterized in that: Multiple rows of guide brackets (3) are arranged above and below the periphery of the vertical steel pipe (11), each row of guide brackets has 4 guide brackets, and the horizontal angle of each guide bracket is 90 degrees.

8. A method for using the pipe pile core air lift slag cleaning device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. When the foundation pit is excavated to the designed elevation, the pile head of the superelevated part of the pipe pile (6) is cut off, and a working surface for cleaning the slag in the cavity of the pipe pile (6) is left; S2, inserting the vertical steel pipe (11) into the cavity of the pipe pile (6), and the backstage high-pressure air pump (4) transmits the high-pressure gas to the jet nozzle (2) at the lower end of the vertical steel pipe (11) through the connecting hose (5); S3, the high-pressure gas ejected from the jet nozzle (2) cuts and breaks the slag (7) in the cavity of the pipe pile (6), and the gas flow refluxes upward in the cavity of the pipe pile to lift and carry the slag (7) to the top of the pipe pile (6); S4, adjusting the posture of the device and continuously deepening it, when the horizontal steel pipe (12) is suspended on the top of the pipe pile (6), the device reaches the maximum slag cleaning depth; S5, pulling out the device from the cavity of the pipe pile (6), and repeating the above steps to clean the debris (7) in the cavities of other pipe piles.

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