Pile hole bottom sand cleaning device for pile casing construction

Abstract

The utility model provides a pile hole bottom sand cleaning device used in sleeve pile construction, which comprises a negative pressure pipe group, the negative pressure pipe group comprises a sand suction head and a plurality of steel pipes, one end of the sand suction head is provided with mutually parallel support teeth along the circumference, a sand inlet gap is reserved between every two support teeth, the sand suction head is connected with the steel pipe at the tail end, the sand suction head is also provided with an air inlet pipe, and the air inlet pipe is connected with the negative pressure pipe. The axis of the air inlet pipe and the axis of the sand suction head form an included angle. And the high-pressure hose is connected with the air inlet pipe, and after air is introduced into the high-pressure hose, the air can be blown into the steel pipe along the air inlet pipe. The sand suction head can extend to the bottom of a pile hole by adopting a plurality of mutually connected steel pipes, and the air pressure in the steel pipes is lower through upward blowing air flow, so that the air pressure outside the steel pipes blows settled sand at the bottom of the hole into the steel pipes, and the settled sand is conveyed upwards through the steel pipes; the supporting teeth at the end of the sand suction head and the sand inlet gap are adopted so that settled sand can enter the steel pipe conveniently, and pipe opening blockage is prevented.

Description

Technical Field

[0001] The utility model belongs to the field of building construction, in particular to a sand cleaning device at the bottom of a pile hole used in pile casing construction. Background Art

[0002] As the demand for underground railway development in major cities gradually emerges, deep foundation pit construction is increasing, and the use of pile foundation enclosure structures is becoming more and more frequent; in traditional construction, it is necessary to open up a fertilizer trough of about 1.5m outward from the piling position to facilitate the construction personnel and construction equipment to clean and install the bottom of the pile. However, since fertilizer troughs need to be dug on both sides of the building, the construction area actually occupies one more lane of space than the construction land, which has a greater impact on urban traffic. The current design uses sleeve pile construction, that is, large piles are used to cover small piles, which is optimized on conventional hanging piles to reduce the subsequent backfilling of fertilizer troughs, excavation of earthwork, production and removal of ring beams and anchor cables; small piles are constructed in advance, eliminating the need for locking piles during the subsequent foundation pit excavation.

[0003] During the construction of the pile casing, after the small pile is drilled with a down-the-hole drill with a diameter of 400mm, the depth of the pile foundation entering the slightly weathered granite is greater than that of the traditional piling method, and there is no space for the fertilizer trough, the stone slag particles at the bottom of the small pile cannot be completely "blown" away during the construction of the small pile. As a result, after the small pile is constructed to the designed elevation, the sediment at the bottom of the pile hole is too thick, affecting the fixation and actual length of the small pile. In order to meet the design and specification requirements, the sediment thickness after drilling should be ensured to be less than 50mm. Therefore, the sediment at the bottom of the hole needs to be sucked out of the hole. Utility Model Content

[0004] In view of this, the utility model aims to provide a sand cleaning device for the bottom of a pile hole used in pile casing construction, so as to clean the sediment at the bottom of the hole.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A sand cleaning device for the bottom of a pile hole used in pile construction, comprising:

[0007] A negative pressure pipe group, comprising a sand suction head and a plurality of steel pipes connected end to end in sequence, wherein a first flange is provided at one end of the sand suction head, and a plurality of supporting teeth are provided along the circumference of the other end, and each supporting tooth is parallel to the axial direction of the sand suction head, and a sand entry gap is left between each two adjacent supporting teeth, the sand suction head is connected to the steel pipe at the end through the first flange, and an air inlet pipe is also provided on the sand suction head, the axis of the air inlet pipe forms an angle with the axis of the sand suction head, and the pipe opening at the connection between the sand suction head and the air inlet pipe faces the direction of the steel pipe;

[0008] The high-pressure hose is connected to the air inlet pipe, and when gas is introduced into the high-pressure hose, the gas can be blown into the steel pipe along the air inlet pipe.

[0009] Furthermore, a second flange is provided at both ends of each of the steel pipes, and two adjacent steel pipes are connected via the second flange.

[0010] Furthermore, an anti-drop ring is provided between the second flanges of two adjacent steel pipes, the outer edge of the anti-drop ring is placed between the second flanges of the two steel pipes, and the inner diameter is smaller than the diameters of the two steel pipes.

[0011] Furthermore, an anti-drop ring is provided between the first flange and the second flange of the last steel pipe, the outer edge of the anti-drop ring is placed between the first flange and the second flange, and the inner diameter is smaller than the diameter of the steel pipe.

[0012] Furthermore, the pipe opening of the air inlet pipe connected to the sand suction head is placed close to one end of the anti-fall ring.

[0013] Furthermore, the upper surface and the lower surface of the anti-drop ring are respectively provided with sealing protrusions, the sealing protrusions are annular, and an annular groove matching the sealing protrusions is opened on the end surface of the second flange of each steel pipe.

[0014] Furthermore, the anti-fall ring includes a receiving portion, the receiving portion is trumpet-shaped, and its opening direction is toward one end of the sand suction head.

[0015] Furthermore, a second flange at one end of each steel pipe extends radially outward to form a short arm.

[0016] Furthermore, a limiting edge is provided at the outer end of the short arm.

[0017] Furthermore, a third flange is provided at the outer end of the air intake pipe, a fourth flange is provided at the end of the high-pressure hose, and the air intake pipe and the high-pressure hose are connected via the third flange and the fourth flange.

[0018] Compared with the prior art, the sand cleaning device at the bottom of the pile hole used in pile casing construction described in the utility model has the following advantages:

[0019] The utility model adopts a plurality of interconnected steel pipes so that the sand suction head can extend to the bottom of the pile hole. The air pressure in the steel pipe is low through the air flow blowing upward, so that the air pressure outside the steel pipe blows the sediment at the bottom of the hole into the steel pipe and transports it upward through the steel pipe. The supporting teeth at the end of the sand suction head and the sand inlet gap are used to facilitate the sediment to enter the steel pipe, thereby preventing the pipe opening from being blocked.

[0020] The anti-drop ring is used to prevent some sand from falling in mid-air due to the long lift of the steel pipe, especially at the end of the process, so that some sand can contact the anti-drop ring during the falling process and be taken out of the pile hole during the rising process of the steel pipe, preventing the settled sand from falling back into the pile hole;

[0021] The mouth of the air intake pipe is arranged closer to the anti-drop ring to prevent sand from falling into the air intake pipe and causing the negative pressure hose to be scratched by sand.

[0022] A short arm is used to facilitate the lifting of steel pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the working state of the sand cleaning device;

[0025] Figure 2 This is a schematic diagram of the matching structure of the high-pressure hose and the negative pressure pipe group;

[0026] Figure 3 This is a schematic diagram of the anti-fall ring structure;

[0027] Figure 4 This is a schematic diagram of the connection structure between the anti-drop ring and the steel pipe.

[0028] Description of reference numerals:

[0029] 1-negative pressure pipe group; 11-sand suction head; 111-first flange; 112-supporting teeth; 113-sand inlet gap; 114-inlet pipe; 115-third flange; 12-steel pipe; 121-second flange; 123-short arm; 124-limiting edge; 2-high-pressure hose; 21-fourth flange; 3-anti-drop ring; 31-sealing protrusion; 32-receiving part; 4-sand remover; 5-blower; 6-pile hole. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] The sand cleaning device at the bottom of the pile hole 6 used in the pile casing construction described in the utility model comprises a negative pressure pipe group 1 and a high pressure hose 2, wherein the negative pressure pipe group 1 comprises a sand suction head 11 and a plurality of steel pipes 12 connected in sequence end to end, specifically, the sand suction head 11 is tubular, one end of which is provided with a first flange 111, and the other end is provided with a plurality of supporting teeth 112 along the circumference, and each supporting tooth 112 is respectively parallel to the axial direction of the sand suction head 11, and a sand feeding gap 113 is left between each adjacent two supporting teeth 112, and the end faces of each supporting tooth 112 are all in the same plane; a second flange 121 is respectively provided at the end of each of the steel pipes 12, and each adjacent two steel pipes 12 are connected through the second flange 121; and the sand suction head 11 can be connected to the steel pipe 12 at the end through the first flange and the second flange, and the sand suction head 11 is also connected to an air intake pipe 114, and the air intake pipe 1 14 is connected with the middle part of the sand suction head 11, the high-pressure hose 2 is connected with the sand suction head 11 through the air intake pipe 114, and the axis of the air intake pipe 114 forms an angle with the axis of the sand suction head 11, and the pipe opening at the connection between the sand suction head 11 and the air intake pipe 114 faces the steel pipe 12, so that the gas passed into the air intake pipe 114 can flow toward the end of the negative pressure pipe group 1 away from the sand suction head 11. At this time, due to the faster gas flow rate away from the end of the sand suction head 11, a low pressure is generated in the negative pressure pipe group 1, so that the air at the sand suction head 11 flows to the low pressure place, so that the inside of the negative pressure pipe group 1 is in a negative pressure state, so as to suck the external fluid into the negative pressure pipe group 1. Specifically, a third flange 115 is provided at the outer end of the air intake pipe 114, and a fourth flange 21 is provided at the end of the high-pressure hose 2. The air intake pipe 114 and the high-pressure hose 2 are connected by the third flange 115 and the fourth flange 21.

[0035] The sand cleaning device at the bottom of the pile hole 6 in the pile casing construction described in the utility model is used. During use, the pile hole 6 is first drilled out by a down-the-hole drill, and the sand suction head 11 is installed on a steel pipe 12. At the same time, the high-pressure hose 2 is connected with the air inlet pipe 114, and the steel pipe 12 is hoisted away from one end of the sand suction head 11 to transport it into the pile hole 6. When the outer end of the steel pipe 12 moves to a predetermined height, the second steel pipe 12 is connected through a second flange, and the transport is continued downward until the supporting teeth 112 of the sand suction head 11 contact the sediment at the bottom of the hole, and the outer end of the high-pressure hose 2 is connected to the blower 5, and the air is tightened through the high-pressure hose 2. The outer end of the negative pressure pipe group 1 is connected to the sand remover 4 through a pipeline, and air is transported into the negative pressure pipeline through the high-pressure hose 2, so that the gas in the negative pressure pipe group 1 flows outward, and negative pressure is formed in the negative pressure pipe group 1, so that the sediment around the sand suction head 11 is sucked into the negative pressure pipe group 1 and discharged upward, and enters the sand remover 4 for subsequent treatment.

[0036] The sand cleaning device at the bottom of the pile hole 6 in the pile casing construction described in the utility model is further provided with an anti-drop ring 3 between the second flange plates 121 of two adjacent steel pipes 12 and between the first flange plate 111 and the second flange plate 121. The outer edge of the anti-drop ring 3 is placed between the second flange plates 121 of the two steel pipes 12, and the inner diameter is smaller than the diameter of the two steel pipes 12. Specifically, the upper surface and the lower surface of the anti-drop ring 3 are respectively provided with sealing protrusions 31, and the sealing protrusions 31 are annular. An annular groove matching the sealing protrusion 31 is opened on the end surface of the second flange plate 121 of each steel pipe 12, and the sealing protrusion 31 is placed in the annular groove. The anti-drop ring 3 is also provided with a through hole corresponding to the flange. The connection between the two steel pipes 12 is locked by spirally passing through the flange plate and the anti-drop ring 3, and at the same time, the flange plate squeezes the anti-drop ring 3 to seal to prevent air leakage. The pipe opening of the air inlet pipe 114 connected to the sand suction head 11 is placed close to one end of the anti-drop ring 3. During the process of suctioning sediment, when the sediment rises and cannot float to the top of the negative pressure pipe group 1 due to its large volume, or when the supply of external air is cut off at the end of the sediment discharge process, the sediment still remaining in the negative pressure pipe group 1 will fall in mid-air. The anti-fall plate can catch part of the falling sediment to prevent the sediment sucked in mid-air from falling back into the hole, further reducing the thickness of the sediment layer at the bottom of the hole and improving the quality of the project. The anti-fall ring 3 includes a receiving portion 32, which is trumpet-shaped and its opening direction is toward one end of the sand suction head 11, so that the receiving portion 32 has a slope, and the receiving portion 32 is higher near the axis of the negative pressure pipe. When the sediment and gravel in mid-air fall on the receiving portion 32, they will roll to a lower place due to gravity, thereby preventing the sediment and gravel from falling into the hole.

[0037] The sand cleaning device at the bottom of the pile hole 6 in the pile construction of the utility model has a second flange 121 at one end of each steel pipe 12 extending a short arm 123 radially outward, and a limiting edge 124 is provided on the short arm 123, and the short arm 123 is placed on the flange at the top of the steel pipe 12. During the working process, the negative pressure pipe group 1 can be lifted by a crane or other engineering equipment through a cable and tied to the short arm 123, and the negative pressure pipe group 1 can be controlled to move into the pile hole 6. When the negative pressure pipe group 1 is After the outer end of the pressure pipe group 1 is at a predetermined height, the next section of the steel pipe 12 can be installed at the end of the outermost steel pipe 12, and the negative pressure pipe group 1 can be continuously conveyed downward until the bottom end of the negative pressure pipe group 1 contacts the bottom of the pile hole 6, thereby facilitating the conveyance of the negative pressure pipe group 1 to the bottom of the hole. At the same time, when the negative pressure pipe group 1 is pulled out of the pile hole 6, after being pulled out to a predetermined height, the short arm 123 of the next section of the steel pipe 12 can be first pulled by a cable, and then the upper exposed steel pipe 12 can be removed, thereby facilitating the operation of construction personnel.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand cleaning device for the bottom of a pile hole used in pile construction, characterized in that: include A negative pressure pipe group, comprising a sand suction head and a plurality of steel pipes connected end to end in sequence, wherein a first flange is provided at one end of the sand suction head, and a plurality of supporting teeth are provided along the circumference of the other end, and each supporting tooth is parallel to the axial direction of the sand suction head, and a sand entry gap is left between each two adjacent supporting teeth, the sand suction head is connected to the steel pipe at the end through the first flange, and an air inlet pipe is also provided on the sand suction head, the axis of the air inlet pipe forms an angle with the axis of the sand suction head, and the pipe opening at the connection between the sand suction head and the air inlet pipe faces the direction of the steel pipe; The high-pressure hose is connected to the air inlet pipe, and when gas is introduced into the high-pressure hose, the gas can be blown into the steel pipe along the air inlet pipe.

2. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 1, characterized in that: A second flange is provided at both ends of each steel pipe, and two adjacent steel pipes are connected via the second flange.

3. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 2, characterized in that: An anti-drop ring is also arranged between the second flanges of two adjacent steel pipes. The outer edge of the anti-drop ring is placed between the second flanges of the two steel pipes, and the inner diameter is smaller than the diameters of the two steel pipes.

4. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 2, characterized in that: An anti-drop ring is provided between the first flange and the second flange of the last steel pipe, the outer edge of the anti-drop ring is placed between the first flange and the second flange, and the inner diameter is smaller than the diameter of the steel pipe.

5. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 3 or 4, characterized in that: The pipe opening of the air inlet pipe connected to the sand suction head is arranged close to one end of the anti-fall ring.

6. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 5, characterized in that: The upper surface and the lower surface of the anti-drop ring are respectively provided with sealing protrusions, the sealing protrusions are annular, and an annular groove matching the sealing protrusions is opened on the end surface of the second flange of each steel pipe.

7. The sand cleaning device at the bottom of a pile hole used in pile construction according to claim 5, characterized in that: The anti-fall ring comprises a receiving portion, which is trumpet-shaped and has an opening facing one end of the sand suction head.

8. The sand cleaning device at the bottom of a pile hole used in pile construction according to claim 2, characterized in that: The second flange at one end of each steel pipe extends a short arm radially outward.

9. A sand cleaning device for the bottom of a pile hole used in pile construction according to claim 8, characterized in that: The short arm is provided with a limiting edge on the outer side.

10. The sand cleaning device at the bottom of a pile hole used in pile construction according to claim 1, characterized in that: The outer end of the air intake pipe is provided with a third flange, the end of the high-pressure hose is provided with a fourth flange, and the air intake pipe and the high-pressure hose are connected via the third flange and the fourth flange.

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