A pump lifting reverse circulation device for hole cleaning of a concrete bored pile

Abstract

The application discloses a pump lifting reverse circulation device for hole cleaning of a concrete bored pile, which comprises a mud pump, the mud pump is placed in a guide pipe, a sealing element is arranged between the mud pump and the guide pipe, a guide plate for guiding mud upwards is arranged at the outlet of the mud pump, a length-adjustable connecting chain is connected to the top of the mud pump, the upper end of the connecting chain is connected with a mud output pipe, and the mud output pipe is detachably and connectively connected with the top of the guide pipe. The device can realize the effect of fast hole cleaning in the prior art, has low operation cost and is simple and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of highway bridges, and more specifically to a pump-lift reverse circulation device for cleaning concrete cast-in-place piles. Background Technology

[0002] In bridge construction, after the concrete pile hole is formed, it needs to be cleaned to reduce the sand content in the mud and improve the quality of the grouting. The common method is to use a concrete pouring guide pipe, which is lowered into the pile hole. Qualified mud is injected into the top of the guide pipe and then flows out from the bottom. The sufficient mud flow rate washes away the mud and sand at the bottom of the pile hole. When the mud and gravel are mixed, it flows upward in the pile, carrying the mud and sand up and flowing out from the top of the pile, thus achieving the purpose of cleaning the hole. Although this method is technically mature, the cleaning time is relatively long.

[0003] For deep-hole cast-in-place piles in complex geological conditions, hole cleaning needs to be completed as quickly as possible to prevent hole collapse. In this case, an air-lift reverse circulation process is generally used for hole cleaning. The advantage is that the reverse circulation process uses high-pressure gas to push the mud upwards from the guide pipe, causing the mud to flow upwards and carry away sediment. The air-lift reverse circulation process is fast and effective. However, its disadvantages include the need for a specialized reverse circulation device, which is relatively long and slender, time-consuming and labor-intensive to install, requires high sealing, and necessitates a large air compressor unit to provide high-pressure, high-flow-rate gas. This results in large equipment size, high cost, and high operating costs due to high electricity or fuel consumption. Summary of the Invention

[0004] This invention discloses a pump-lift reverse circulation device for cleaning concrete cast-in-place piles, which solves the problems in the prior art of quickly cleaning the hole to prevent collapse, greatly reducing equipment costs, and being extremely easy to use.

[0005] A pump-lift reverse circulation device for cleaning concrete cast-in-place piles includes a mud pump placed inside a guide tube. A sealing element is provided between the mud pump and the inner wall of the guide tube. The sealing element is located between the lower inlet and the upper outlet of the mud pump. The sealing element achieves a seal between the pump body and the inner wall of the guide tube, dividing the guide tube into a lower suction area and an upper outlet area.

[0006] Preferably, an adjustable-length connecting chain is connected above the mud pump, and a mud output pipe is connected to the upper end of the connecting chain. The mud output pipe is detachably connected to the top of the conduit.

[0007] Preferably, the outlet of the mud pump is provided with a guide plate for guiding the mud upward.

[0008] Preferably, a filter plate is provided at the inlet of the mud pump, and a stirring blade is provided at the lower end of the filter plate. The stirring blade is used to clean debris on the filter plate to prevent clogging.

[0009] Preferably, the stirring blades are connected to the pump body shaft of the mud pump.

[0010] Preferably, the lower end of the mud pump is provided with a support base outside the mixing blades. The support base serves a protective function, preventing the mixing blades from being bumped or knocked during placement and installation.

[0011] Preferably, the lower end of the mud output pipe is threadedly connected to the guide pipe, and a mud outlet is provided on the side of the mud output pipe. The threaded connection can simultaneously achieve the fixing of the mud output pipe and the sealing of the joint.

[0012] Preferably, the lower end of the mud output pipe is provided with a movable nut, which is threadedly connected to the guide pipe.

[0013] The device is placed inside the conduit, below the mud level. The connecting chain provides positioning, and the mud pump seal seals the conduit, effectively turning the entire conduit into a slender mud suction pipe. When the mud pump is started, the suction force draws the sediment deposited at the bottom of the cast-in-place pile through the bottom of the conduit. The mud is then pushed upwards by the pump's discharge, flowing past a guide plate to suppress mud rotation and exiting from the mud outlet at the top of the conduit. This process achieves a pump-lift reverse circulation cleaning process. The seal creates two independent spaces within the conduit: the lower space is the mud pump suction area (negative pressure), and the upper space is the mud pump discharge area (positive pressure).

[0014] The beneficial effects of this invention are:

[0015] This invention uses a mud pump installed in a conduit to draw in mud and sand from the bottom of the cast-in-place pile and transport it to the top of the conduit, from where it is transported to the mud pool. This results in short hole cleaning time, low requirements for device precision and cost, low operating costs, and extremely high cost-effectiveness. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of the present invention;

[0019] Figure 3 This is a diagram of the mud conveying structure;

[0020] Figure 4 This is a structural diagram of the connecting chain and the mechanisms at both ends;

[0021] In the diagram, 1. Power cord, 2. Lifting point, 3. Slurry outlet, 4. Connecting chain, 5. Conduit, 6. Guide plate, 7. Slurry outlet, 8. Seal, 9. Support base, 10. Pump body shell, 11. Motor, 12. Internal power cord, 13. Movable nut, 14. Slurry output pipe, 15. Agitator blades, 16. Pump body shaft, 17. Impeller, 18. Filter plate. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] like Figure 1-2 As shown, this invention discloses a pump-lift reverse circulation device for cleaning concrete cast-in-place piles. The device places a mud pump inside a concrete guide pipe 5. A support base 9 is installed at the front end (lower end) of the mud pump. This support base is cylindrical, with multiple perforated weight-reducing holes spaced apart on its outer wall. The upper end of the support base is connected to the pump housing 10. Inside the cylindrical support base 9, stirring blades 15 are installed. These stirring blades are connected to a pump shaft 16 inside the mud pump. The upper end of the pump shaft is connected to a motor 11, and multiple guide plates 6 are installed on the motor housing. Above the stirring blades, a filter plate 18 connected to the pump housing is installed. The filter plate can filter large particles of debris in the mud, preventing them from entering the pump and causing blockage. The stirring blades are used to clean debris adsorbed below the filter plate, preventing blockage of the filter plate's holes and thus ensuring smooth pumping.

[0024] A sealing element 8 is provided between the pump body shell 10 and the guide tube 5 of the mud pump. This sealing element can seal the gap between the pump body shell and the inner wall of the guide tube. The impeller 17 is provided outside the pump body shaft. Under the action of the motor driving the impeller to rotate, the mud at the bottom of the guide tube is drawn into the pump body through the holes on the filter plate 18. Then it is output to the guide tube above the pump body through the slurry outlet 7. The rotating mud is conveyed upward under the inhibition of the guide plate 6. When it is conveyed to the mud output pipe 14 at the top of the guide tube, it is discharged into the mud pool from the mud outlet 3 on the side of the mud output pipe.

[0025] An adjustable-length connecting chain 4 is connected above the mud pump. This connecting chain consists of multiple iron rings connected end to end, and the length of the connecting chain can be changed by increasing or decreasing the number of iron rings. The upper end of the connecting chain is connected to the top of the mud output pipe. By using hoisting equipment to suspend the mud output pipe at the hoisting point 2, the mud pump can be installed inside the grouting pile guide pipe. The power cable 1 passes through the mud output pipe and continues downward, connecting with the internal power cable 12 extending downward along the guide pipe, and finally connecting to the motor 11 to supply power to the motor. The motor 11 is used to provide driving force for the mud pump.

[0026] A movable nut 13 is installed at the lower end of the mud discharge pipe. The inner ring of the movable nut has an internal thread, and the upper end of the guide tube has an external thread. The internal and external threads are engaged to fix the mud discharge pipe to the upper end of the guide tube. A mud outlet 3 is provided on the side of the mud discharge pipe. The mud is transported in the guide tube by the power of the pump body and the guidance of the guide plate to the mud discharge pipe, and then discharged to the mud tank through the mud outlet 3.

[0027] The connecting chain here can also be replaced by a connecting rope.

[0028] The working process of this invention is as follows:

[0029] When the concrete guide pipe 5 is lowered into place, it is raised to a certain height according to the estimated sediment deposition to prevent mud from clogging the bottom of the guide pipe. Using lifting equipment, the upper lifting point 2 of the mud output pipe is hoisted, and the concrete mud output pipe 14 is lifted. Then, the mud pump body is lifted together via the pump body connecting chain 4 and placed into the concrete guide pipe. The length of the pump body connecting chain is pre-set according to the mud water level in the cast-in-place pile, so that the pump body is lowered to a position 2 to 3 meters below the mud water level. The movable nut 13 is screwed into the upper end of the concrete guide pipe 5 to connect the internal and external threads and tighten it, completing the positioning. The mud pump is powered on, or the speed of the mud pump can be adjusted using a frequency converter or other power supply device to control the mud flow rate, achieving controllable hole cleaning speed. During the hole cleaning process, the concrete guide pipe can be moved up and down appropriately to adjust the relative position of the bottom of the guide pipe and the deposited sediment to avoid clogging the guide pipe.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not 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. A pump-lift reverse circulation device for cleaning concrete cast-in-place piles, characterized in that, Includes a mud pump, which is placed inside a conduit (5). A sealing element (8) is provided between the mud pump and the inner wall of the conduit. The sealing element is located between the lower inlet and the upper outlet of the mud pump, dividing the conduit into a lower suction area and an upper outlet area. The outlet (7) of the mud pump is provided with a guide plate (6) for guiding the mud upward. A filter plate (18) is provided at the inlet of the mud pump, and a stirring blade (15) is provided at the lower end of the filter plate. The stirring blades (15) are connected to the pump body shaft of the mud pump.

2. The pump-lift reverse circulation device for cleaning concrete cast-in-place piles according to claim 1, characterized in that, The mud pump is connected to a connecting chain (4) of adjustable length, and the upper end of the connecting chain is connected to a mud output pipe (14). The mud output pipe is detachably connected to the top of the conduit.

3. The pump-lift reverse circulation device for cleaning concrete cast-in-place piles according to claim 1, characterized in that, The lower end of the mud pump is provided with a support base (9) outside the mixing blades.

4. The pump-lift reverse circulation device for cleaning concrete cast-in-place piles according to claim 2, characterized in that, The lower end of the mud output pipe (14) is threadedly connected to the conduit (5), and a mud outlet (3) is provided on the side of the mud output pipe.

5. A pump-lift reverse circulation device for cleaning concrete cast-in-place piles according to claim 4, characterized in that, The lower end of the mud output pipe (14) is provided with a movable nut (13), which is threadedly connected to the guide pipe (5).

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