Treatment method and treatment device for end bearing pile sediment

Abstract

The invention discloses an end bearing pile sediment treatment method and device, and belongs to the technical field of underground structures. The method comprises the steps that a plurality of drill holes leading to the pile end are longitudinally formed in a reinforcement cage of a to-be-treated end bearing pile; high-pressure water is introduced into the bottom of the drill hole through a rotation increasing spray head, and the bottom of the drill hole is cleaned; and high-pressure cement paste is injected to replace liquid, sediment or broken pile clamping mud in the drill hole. The sediment of the end bearing pile is treated in a cleaning and cement paste injection mode, the disease problem that the sediment is too thick or the pile is broken due to mud clamping is effectively solved, hidden dangers existing in a pile foundation are efficiently treated, and a foundation guarantee is provided for stabilizing the foundation of a building and maintaining the safety of facilities; and the cost for treating the original scrapped pile body and re-piling the foundation pile can be reduced to a great extent, and the time cost for treating diseases can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of underground structures, and in particular to a method and a device for processing end-bearing pile sediment. Background Art

[0002] End-bearing piles are a basic engineering technology commonly used in deep foundation pit support and bridge cantilever structures. They are widely used in various industries such as industry, civil engineering, highways, railways, electricity, and water conservancy. The bearing layer at the end of the end-bearing pile is often medium-weathered bedrock or dense gravel, pebbles and other strata. After the foundation pile is bored, it is inevitable that the steel cage will hit the hole wall during the lowering process. The contact with the hole wall causes the weathered rock and gravel on the side wall to fall to the bottom of the hole, generating sediment. After the steel cage is lowered, the bottom cleaning operation is also easy to disturb the hole wall and generate sediment again.

[0003] Therefore, it is difficult to avoid the appearance of sediment during the construction process. During the underwater concrete pouring process, these sediments cause the bottom of the conduit to rise above the concrete liquid level, resulting in mud-entrained piles and broken piles, which eventually lead to excessive settlement of the foundation piles and even their scrapping. Therefore, sediments pose a great hidden danger to the quality of the project and need to be removed in time during construction.

[0004] At present, the methods for dealing with excessively thick sediment or deep mud-entrained broken piles mainly include destroying the original foundation piles and re-grouting, sidewall grouting, and additional foundation piles around the original pile positions. These treatment processes have high treatment costs and long treatment cycles. Therefore, it is necessary to design a low-cost, simple-construction, high-quality treatment method for excessively thick sediment or deep mud-entrained broken piles. Summary of the invention

[0005] In view of the above technical problems existing in the prior art, the present invention provides a method and a device for treating end-bearing pile sediments, so as to treat the sediments and improve the bearing capacity or integrity of the end-bearing pile.

[0006] The invention discloses a method for treating end-bearing pile sediment, comprising the following steps: arranging a plurality of boreholes leading to the pile end in the longitudinal direction of a steel cage of the end-bearing pile to be treated; introducing high-pressure water at the bottom of the borehole through a rotation-increasing nozzle and cleaning the bottom of the borehole; and injecting high-pressure cement slurry to replace liquid, sediment or mud in the broken pile in the borehole.

[0007] Preferably, the drilling hole adopts a two-opening structure, including a first opening and a second opening arranged at the lower side of the first opening;

[0008] A grouting pipe is arranged on the opening.

[0009] Preferably, a flange is provided at the lower end of the grouting pipe.

[0010] Preferably, the method for cleaning the sediment comprises:

[0011] Connect the end of the drill pipe to the rotation-enhancing nozzle, and lower the rotation-enhancing nozzle to the bottom of the borehole;

[0012] High-pressure water is introduced into the rotation-enhancing nozzle through a high-pressure pump and a drill rod to clean the bottom of the borehole;

[0013] During cleaning, rotate and repeatedly raise and lower the drill pipe and the rotation-increasing nozzle until clean water overflows from the orifice of the adjacent borehole or the current borehole;

[0014] Clean the drill holes one by one.

[0015] Preferably, the high-pressure pipeline of the high-pressure pump is connected to the grouting pipe, and high-pressure water is introduced into the borehole;

[0016] The output end of the drilling rig is connected to a drill rod; the drill rod is movably installed in the high-pressure pipeline.

[0017] Preferably, the method of injecting high pressure cement slurry comprises:

[0018] Connect the output end of the grouting pump to the grouting pipe;

[0019] High pressure cement slurry is passed through the grouting pipe into the borehole until any of the following end criteria is reached:

[0020] For the boreholes that have slurry returning from other boreholes during cleaning, the slurry returning to the orifices of other boreholes is regarded as the end standard;

[0021] In the case where the current borehole is not connected to the adjacent borehole, the bottom hole grouting method is adopted, and the grouting is terminated when it returns to the hole mouth;

[0022] If the slurry level drops after grouting is completed, add slurry in time.

[0023] The present invention also provides a processing device for implementing the above processing method, comprising a drilling rig, a high-pressure pump, a rotation-increasing nozzle and a grouting pump;

[0024] The drilling rig is used to obtain an end-bearing pile structure, the end-bearing pile structure comprising: a steel cage, and a plurality of boreholes longitudinally arranged on the steel cage and leading to the pile end;

[0025] The output end of the high-pressure pump is provided with a rotation-increasing nozzle, and the rotation-increasing nozzle is movably arranged at the bottom of the borehole;

[0026] The output end of the grouting pump is detachably mounted on the borehole.

[0027] Preferably, the steel cage is fixed in the pile hole of the end-bearing pile;

[0028] The drilling hole includes an opening and a second opening arranged at the lower side of the opening;

[0029] A grouting pipe is arranged on the opening; a flange is arranged at the lower end of the grouting pipe.

[0030] Preferably, the output end of the drilling rig is connected to the drill rod;

[0031] The output end of the high-pressure pump is connected to the rotation-increasing nozzle through a drill rod;

[0032] The output end of the grouting pump is connected with the grouting pipe.

[0033] Preferably, the upper end of the rotation-enhancing nozzle is provided with a joint matching with the drill rod, the lower end is provided with a head, and the side wall is provided with a plurality of nozzles; and the nozzle is provided with a spiral water passage.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: by cleaning and injecting cement slurry, the sediment of the end-bearing piles is treated, effectively solving the problems of excessively thick sediments or broken piles due to mud, efficiently dealing with the hidden dangers of the pile foundation, providing a basic guarantee for stabilizing the foundation of buildings and maintaining the safety of facilities, and can greatly reduce the cost of treating the original scrapped piles and re-driving the foundation piles, as well as reducing the time cost of treating the defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the method for treating end bearing pile sediment;

[0036] Figure 2 It is a schematic diagram of hole washing for sediment treatment of end bearing piles;

[0037] Figure 3 It is a schematic diagram of grouting;

[0038] Figure 4 is a longitudinal cross-sectional view of the rotation-increasing nozzle;

[0039] Figure 5 is a cross-sectional view of the nozzle.

[0040] Markings in the figure:

[0041] 1 end bearing pile, 11 pile hole, 12 pile end, 13 steel cage, 15 pile hole wall, 2 sediment;

[0042] 3 drilling, 31 opening, 32 opening, 35 grouting pipe, 37 flange,

[0043] 4 drilling rig, 5 high pressure pump, 51 drill rod, 52 rotation nozzle, 53 joint, 54 nozzle, 55 spiral water channel, 56 head, 6 grouting pump. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0046] The first aspect of the present invention provides a method for treating end bearing pile sediment 2, such as Figure 1-3 As shown, the following steps are included:

[0047] Step 101: longitudinally arrange a plurality of boreholes 3 leading to the pile end 12 on the reinforcement cage 13 of the end-bearing pile 1 to be processed.

[0048] Step 102: High-pressure water is introduced into the bottom of the borehole 3 through the rotation-increasing nozzle 52 to clean the bottom of the borehole 3.

[0049] Step 103: Inject high-pressure cement slurry to replace the liquid, sediment 2 or mud in the broken pile in the borehole.

[0050] By cleaning and injecting cement slurry, the sediment of the end-bearing piles can be treated, effectively solving the problems of too thick sediment or broken piles with mud, and efficiently dealing with the hidden dangers of the pile foundation, providing a basic guarantee for stabilizing the foundation of buildings and maintaining the safety of facilities. It can greatly reduce the cost of dealing with the original scrapped piles and re-driving the foundation piles, as well as reducing the time cost of dealing with the defects.

[0051] like Figure 2 and Figure 3 The drill hole 3 adopts a two-opening structure, including a first opening 31 and a second opening 32 arranged at the lower side of the first opening 31; a grouting pipe 35 is arranged on the first opening 31. A flange 37 is arranged at the lower end of the grouting pipe 35; the diameter of the first opening is 100-110mm and the depth is 0-6 meters; the diameter of the grouting pipe is 90-100m; the diameter of the second opening is 70-90mm.

[0052] In step 101, 2 to 5 holes can be drilled in the steel cage 13 to the defect position. In a specific embodiment, the depth of the first hole is 0 to 6m, and the depth of the first hole can be determined comprehensively according to the pile length; a Φ108mm drill bit is used to make a hole of Φ110mm, and a Φ104mm grouting pipe is inserted; the second hole is made by a Φ89mm or Φ75mm drill bit bare hole, and drilled to the bottom of the sediment 2 or the bottom of the mud-broken pile 0.2 to 0.3m below the bottom. A flange with an outer diameter of 109mm is welded at the bottom of the grouting pipe, and cement slurry (cement mortar) with a grade higher than concrete is used to fix the grouting pipe and the hole wall.

[0053] In step 102, high-pressure clean water is used for hole washing. After the clean water is pressurized by a high-pressure pump, it is transported to the defect position through the drill pipe. The bottom of the drill pipe is connected to a rotation nozzle so that the sprayed high-pressure clean water has a rotating torque, which maximizes the disturbance and tumbling of the sediment and mud at the defect position to improve the cleaning effect. The high-pressure clean water carries the disturbed sediment and mud and is discharged from the hole mouth to the ground.

[0054] More specifically, the method for cleaning the sediment 2 includes:

[0055] Step 201 : Connect the end of the drill rod 51 to the rotation-enhancing nozzle 52 , and lower the rotation-enhancing nozzle 52 to the bottom of the borehole 3 .

[0056] Step 202 : high-pressure water is introduced into the rotation-increasing nozzle 52 through the high-pressure pump 5 and the drill rod 51 to clean the bottom of the borehole 3 .

[0057] A specific connection structure is: the high-pressure pipeline of the high-pressure pump 5 is connected to the grouting pipe 35, and high-pressure water is introduced into the borehole; the output end of the drilling rig 4 is connected to the drill rod 51; the drill rod 51 is movably installed in the high-pressure pipeline.

[0058] Step 203: During cleaning, the drill rod 51 and the rotation-increasing nozzle 52 are rotated and repeatedly raised and lowered until clean water overflows from the orifice of the adjacent borehole or the current borehole.

[0059] Step 204: Clean the drilled holes one by one.

[0060] The rotating high-pressure clean water can more efficiently disturb the sediment and mud at the defective position, which can greatly improve the cleaning effect. When performing rotary jet cleaning at the bottom of the hole, rotate and repeatedly lift and lower the drill bit to repeatedly rinse the defective part. The hole is initially qualified when clean water overflows from the hole mouth; this operation can be implemented by a manipulator or other mechanical device, or it can be implemented manually. Then connect the high-pressure pipeline to the grouting pipe, and use pressurized water to clean the boreholes one by one until clean water overflows from other holes. The injection pressure is not less than 20MPa.

[0061] In step 103, high-grade cement slurry or cement mortar is used to replace the discharged sediment, mud or gaps in the end-bearing pile bearing layer, thereby ultimately improving the bearing capacity of the end-bearing pile bearing layer and the overall integrity of the mud-enclosed broken pile, and ultimately achieving the purpose of improving the bearing capacity and overall integrity of the defective foundation piles.

[0062] Specific methods for injecting high-pressure cement slurry include:

[0063] Step 301: Connect the output end of the grouting pump 6 to the grouting pipe 35.

[0064] Step 302: high pressure cement slurry or cement mortar is passed through the grouting pipe 35 into the borehole 3 until any of the following termination criteria is met: Cement with one to two grades higher than the cement used in the pile concrete can be used for preparation, and the water-cement ratio is determined according to the type of sediment and the hole washing situation.

[0065] Step 303: For the boreholes from which slurry returns during cleaning, the slurry returns to the orifices of the other boreholes as the end criterion.

[0066] Step 304: If the current borehole is not connected to the adjacent borehole, the bottom hole grouting method is adopted, and the grout returning to the current hole opening is used as the end standard. The hole opening of the current borehole is usually not closed during the bottom hole grouting.

[0067] Step 305: If the slurry level drops after the grouting is completed, slurry should be replenished in time.

[0068] Step 306: Connect the cement slurry pipe of the grouting pump 6 to the grouting pipe hole by hole, and use high-pressure cement slurry to replace the well washing fluid, sediment or mud in the broken pile in the hole. The grouting pressure is not less than 20Mpa.

[0069] A second aspect of the present invention provides a processing device for implementing the above method, such as Figure 2-Figure 5 , including a drilling rig 4, a high-pressure pump 5, a rotation-increasing nozzle 52 and a grouting pump 6; the drilling rig 4 is used to obtain an end-bearing pile structure, and the end-bearing pile structure includes: a steel cage 13, and a plurality of boreholes 3 longitudinally arranged on the steel cage 13 and leading to the pile end 12; the output end of the high-pressure pump 5 is provided with a rotation-increasing nozzle 52, and the rotation-increasing nozzle 52 is movably arranged at the bottom of the borehole 3; the output end of the grouting pump 6 is detachably mounted on the borehole 3.

[0070] The steel cage 13 is fixed in the pile hole 11 of the end-bearing pile 1, and the steel cage 13 is attached to the pile hole wall 15; the borehole 3 includes an opening 31 and two openings 32 arranged at the lower side of the opening 31; a grouting pipe 35 is arranged on the opening 31; and a flange 37 is arranged at the lower end of the grouting pipe 35.

[0071] The output end of the drilling rig 4 is connected to the drill rod 51 ; the output end of the high-pressure pump 5 is connected to the rotation-increasing nozzle 52 through the drill rod 51 ; the output end of the grouting pump 6 is connected to the grouting pipe 35 .

[0072] like Figure 4 and Figure 5 The upper end of the rotation-enhancing nozzle 52 is provided with a joint 53 that matches the drill rod 51, the lower end is provided with a head 56, and a plurality of nozzles 54 are provided on the side wall; the nozzle 54 is provided with a spiral water passage 55.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating end bearing pile sediment, characterized in that: The following steps are involved: A plurality of boreholes (3) leading to the pile end (12) are longitudinally arranged on the steel cage (13) of the end-bearing pile (1) to be processed; High-pressure water is introduced into the bottom of the borehole (3) through a rotation-increasing nozzle (52) to clean the bottom of the borehole (3); High-pressure cement slurry is injected to replace the liquid, sediment (2) or mud in the broken piles in the borehole.

2. The processing method according to claim 1, characterized in that: The drill hole (3) comprises an opening (31) and two openings (32) arranged at the lower side of the opening (31); A grouting pipe (35) is provided on the opening (31).

3. The processing method according to claim 2, characterized in that: The lower end of the grouting pipe (35) is provided with a flange (37); The diameter of the first opening is 100-110 mm and the depth is 0-6 meters; the diameter of the grouting pipe is 90-100 meters; the diameter of the second opening is 70-90 mm, and it is drilled to 0.2-0.3 meters below the bottom of the sediment or the bottom of the mud-enclosed broken pile.

4. The processing method according to claim 2, characterized in that: Methods for cleaning the sediment include: Connect the end of the drill rod (51) to the rotation-enhancing nozzle (52), and lower the rotation-enhancing nozzle (52) to the bottom of the borehole (3); High-pressure water is introduced into the rotation-increasing nozzle (52) through a high-pressure pump (5) and a drill rod (51) to clean the bottom of the borehole (3); During cleaning, the drill rod (51) and the rotation-increasing nozzle (52) are rotated and repeatedly raised and lowered until clean water overflows from the orifice of the adjacent borehole or the current borehole; Clean the holes one by one.

5. The processing method according to claim 4, characterized in that: After the high-pressure pipeline of the high-pressure pump (5) is connected to the grouting pipe (35), high-pressure water is introduced into the borehole (3); The output end of the drilling machine (4) is connected to a drilling rod (51); the drilling rod (51) is movably installed in the high-pressure pipeline.

6. The processing method according to claim 2, characterized in that: Methods for injecting high pressure cement slurry include: Connecting the output end of the grouting pump (6) to the grouting pipe (35); High pressure cement slurry is passed through the grouting pipe (35) into the borehole (3) until any of the following termination criteria is reached: For boreholes with slurry returning from adjacent boreholes during cleaning, the slurry returning to the hole mouth of the adjacent borehole is regarded as the completion standard; In the case where the current borehole is not connected to the adjacent borehole, the bottom hole grouting method is adopted, and the grouting is terminated when it returns to the hole mouth; If the slurry level drops after grouting is completed, add slurry in time.

7. A processing device, characterized in that: Used to implement the treatment method according to any one of claims 1 to 6, comprising a drilling rig (4), a high-pressure pump (5), a swirl-enhancing nozzle (52) and a grouting pump (6); The drilling rig (4) is used to obtain an end-bearing pile structure, the end-bearing pile structure comprising: a steel cage (13), and a plurality of drill holes (3) longitudinally arranged on the steel cage (13) and leading to the pile end (12); The output end of the high-pressure pump (5) is provided with a rotation-enhancing nozzle (52), and the rotation-enhancing nozzle (52) is movably arranged at the bottom of the borehole (3); The output end of the grouting pump (6) is detachably mounted on the borehole (3).

8. The processing device according to claim 7, characterized in that The steel cage (13) is fixed in the pile hole (11) of the end bearing pile (1); The drill hole (3) comprises an opening (31) and two openings (32) arranged at the lower side of the opening (31); A grouting pipe (35) is arranged on the opening (31); a flange (37) is arranged at the lower end of the grouting pipe (35).

9. The processing device according to claim 8, characterized in that The output end of the drilling machine (4) is connected to the drilling rod (51); The output end of the high-pressure pump (5) is connected to the rotation-increasing nozzle (52) via a drill rod (51); The output end of the grouting pump (6) is connected to the grouting pipe (35).

10. The processing device according to claim 8, characterized in that The rotation-enhancing spray head (52) has a joint (53) matched with the drill rod (51) at its upper end, a head (56) at its lower end, and a plurality of nozzles (54) on its side wall; The nozzle (54) is provided with a spiral water passage (55).

Images