Grouting device for pile end of cast-in-place pile

Abstract

The utility model relates to the technical field of grouting devices, in particular to a grouting device for the pile end of a cast-in-place pile. Comprising a body; the main body is columnar; a cavity is formed in the main body; a slurry outlet hole is formed in the main body and is communicated with the cavity; a connector is arranged at one end of the main body; and the connecting joint can be connected with a grouting pipe so as to introduce cement grout into the main body. In the prior art, in order to guarantee the quality of a cast-in-place pile, the construction area of the pile end needs to be too large, however, bad influences can be generated on surrounding cities and underground water, and unnecessary environmental damage is caused. Compared with the prior art, the grouting pipe can be connected with the grouting pipe, penetrates through a sediment layer to be inserted into a bearing layer under the driving of the grouting pipe, and then cement grout is poured into the bearing layer, so that the original loose sediment at the pile end is combined into a high-strength combination body by permeating, expanding, filling, compacting and solidifying the sediment through the cement grout; therefore, the bearing capacity of the pile foundation is enhanced, and the construction area does not need to be enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting devices, in particular to a grouting device for a bored pile end. Background Art

[0002] A cast-in-place pile is a type of pile created by drilling a hole in place and then pouring concrete or reinforced concrete. Due to its advantages of being vibration-free, soil-free, and quiet during construction, and its suitability for use in densely built-up urban areas, cast-in-place piles are widely used in construction. Depending on the drilling process, cast-in-place piles can be categorized as dry-drilled, mud-walled, and manually excavated.

[0003] During construction, appropriate drilling equipment is used to dig a hole to the specified depth. To balance the pressure from the surrounding groundwater and the stratum itself, a retaining slurry is poured into the hole simultaneously to prevent the hole wall from collapsing during the excavation process. Once the hole is excavated, the prefabricated steel cage is lowered into the hole section by section. Once the cage is installed, the pile is poured until the pile is formed.

[0004] Although the aforementioned process can effectively cast cast-in-place piles. However, during the excavation process, an indefinite amount of sediment will inevitably be produced. These sediments are composed of sand, stone particles, etc. When the excavation is completed, the sediment will be deposited at the pile end under the action of gravity, forming a sediment layer. The sediment layer is relatively loose and the structure is unstable, which will affect the bearing capacity of the pile foundation. In order to ensure that the bearing capacity of the pile foundation meets the requirements, the construction area of ​​the pile end can only be expanded, but this will take a relatively long time and consume more resources. At the same time, it will have an adverse impact on the surrounding strata and groundwater, causing unnecessary environmental damage. Utility Model Content

[0005] In view of the technical problems of the prior art, the utility model provides a grouting device for the end of a bored pile.

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

[0007] A pile end grouting device comprises: a main body; the main body is columnar; a cavity is provided in the main body; a slurry outlet hole is opened on the main body, and the slurry outlet hole is connected to the cavity; a connecting joint is provided at one end of the main body; the connecting joint can be connected to a grouting pipe to introduce cement slurry into the main body.

[0008] In actual application, the utility model is installed on the grouting pipe through the connecting joint. The grouting pipe is tied to the main reinforcement of the steel cage. Therefore, when the steel cage is lowered, the utility model enters the hole with the first section of the steel cage. When the steel cage moves to the pile end, because the main body is columnar, the main body can pass through the sediment layer and be inserted into the bearing layer. Subsequently, cement slurry is injected from the grouting pipe, and the cement slurry is output through the slurry outlet. With the continuous injection of cement slurry, the cement slurry penetrates, fills, compacts, and consolidates the sediment, so that the originally loose sediment at the pile end is bonded into a high-strength combination, thereby improving the mechanical properties of the bearing layer, and then making the bearing capacity of the pile foundation meet the requirements. Therefore, the use of the utility model does not need to expand the construction area of ​​the pile end, and the original surface construction is converted into point construction, thereby reducing the adverse effects on the surrounding strata and groundwater during construction, thereby reducing the damage to the environment during construction.

[0009] Furthermore, the diameter of the connection joint gradually decreases from the grouting pipe to the main body.

[0010] Furthermore, it also includes rubber; there are multiple pulp outlet holes; the pulp outlet holes are arranged along the axial direction of the main body; the rubber is coated on the main body; and the rubber covers the pulp outlet holes.

[0011] Furthermore, the rubber includes an inner rubber layer and an outer rubber layer; the inner rubber layer is coated on the main body; the inner rubber layer covers the pulp outlet hole; and the outer rubber layer is coated on the inner rubber layer.

[0012] Furthermore, a positioning pin is provided on the inner rubber layer; the positioning pin passes through the inner rubber layer; the positioning pin extends into the slurry outlet hole; and the outer rubber layer covers the positioning pin.

[0013] Furthermore, it also includes a non-return device; the non-return device is arranged in the main body; the output flow direction of the non-return device is directed from the connecting joint to the slurry outlet.

[0014] Furthermore, a limit plate and a limit protrusion are provided in the main body; the limit plate is provided at one end of the check valve close to the slurry outlet; the limit plate is fitted with the check valve; the limit protrusion is provided at one end of the check valve away from the slurry outlet.

[0015] Furthermore, a positioning ring is provided on the check valve; the upper surface of the positioning ring is flush with the lower surface of the limiting protrusion; the sum of the diameter of the positioning ring and the distance that the limiting protrusion protrudes from the inner wall of the main body is equal to the inner diameter of the main body.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Under the premise of keeping the bearing capacity of the pile foundation in compliance with the requirements, the utility model converts the original surface construction into point construction, thereby effectively reducing the construction area, shortening the working hours, reducing resource loss, and effectively reducing the adverse effects on the surrounding strata and groundwater, reducing unnecessary environmental damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Overall structure diagram.

[0019] Figure 2 : Main section view.

[0020] Figure 3 : Rubber cross-section diagram.

[0021] Figure 4 : Schematic diagram of the check valve assembly.

[0022] In the figure: 1. Main body; 11. Connecting joint; 12. Slurry outlet hole; 13. Limiting plate; 14. Limiting protrusion; 2. Rubber; 21. Inner rubber layer; 22. Outer rubber layer; 211. Positioning pin; 3. Backflow check valve; 31. Positioning ring. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] A grouting device for the end of a bored pile comprises: a main body 1, a rubber 2, and a non-return device 3. Specifically, the main body 1 is cylindrical. A cavity is provided in the main body 1, so that cement slurry can enter the main body 1. A slurry outlet hole 12 is also provided on the main body 1, and the slurry outlet hole 12 is connected to the cavity. There are multiple slurry outlet holes 12 and they are arranged along the axial direction of the main body 1. Preferably, the slurry outlet holes 12 are provided in four rows, and each row contains four slurry outlet holes 12. One end of the main body 1 is closed. Preferably, a conical head is provided on the main body 1. A connecting joint 11 is provided at the other end of the main body 1. The connecting joint 11 can be a threaded joint, so that the main body 1 can be connected to the grouting pipe, so that the cement slurry output from the grouting pipe can pass through the connecting joint 11 into the cavity of the main body 1 and finally be output through the slurry outlet hole 12. At the same time, the diameter of the connecting joint 11 gradually decreases from the grouting pipe to the main body 1, that is, the cross-section of the connecting joint 11 is convergent. Therefore, when the cement slurry passes through the connecting joint 11, the pressure of the cement slurry will be enhanced, so that the pressure in the main body 1 is greater than the pressure in the grouting pipe, thereby reducing the energy loss of the cement slurry output equipment.

[0025] The rubber layer 2 includes an inner rubber layer 21 and an outer rubber layer 22. The inner rubber layer 21 is wrapped around the main body 1 and covers the pulp outlet 12. Positioning pins 211 are provided on the inner rubber layer 21. Preferably, the positioning pins 211 are thumbtacks. The positioning pins 211 penetrate the inner rubber layer 21 and extend into the pulp outlet 12. It is worth noting that the diameter of the pin cap of the positioning pin 211 should be larger than the diameter of the pulp outlet 12. The outer rubber layer 22 is wrapped around the inner rubber layer 21 and covers the positioning pins 211.

[0026] The check valve 3 is arranged in the cavity of the main body 1. Preferably, the check valve 3 adopts a one-way valve. The output flow direction of the check valve 3 is directed from the connecting joint 11 to the pulp outlet 12. At the same time, a limit plate 13 and a limit protrusion 14 that match the check valve 3 are also provided in the cavity of the main body 1. The limit plate 13 is annular. The limit plate 13 is arranged at the end of the check valve 3 close to the pulp outlet 12 and can fit with the check valve 3. The limit protrusion 14 is arranged at the end of the check valve 3 away from the pulp outlet 12. Correspondingly, a positioning ring 31 is provided on the check valve 3. The positioning ring 31 is arranged at the end of the check valve 3 away from the pulp outlet 12. The upper surface of the positioning ring 31 is flush with the lower surface of the limit protrusion 14. The sum of the diameter of the positioning ring 31 and the distance that the limit protrusion 14 protrudes from the inner wall of the main body 1 is equal to the inner diameter of the main body 1. Preferably, there are three limiting protrusions 14 and they are evenly arranged along the circumference of the main body 1 .

[0027] In summary, through the above-mentioned structural combination. When assembling the non-return device 3, it is necessary to place the non-return device 3 in a state where the axis thereof coincides with the axis of the main body 1. Subsequently, the non-return device 3 is sent into the main body 1 through one end of the main body 1 where the connecting joint 11 is installed. In the main body 1, the movement path of the non-return device 3 should also coincide with the axis of the main body 1. In this way, the positioning ring 31 can smoothly pass through the limiting protrusion 14. After the positioning ring 31 passes through the limiting protrusion 14, the other end of the non-return device 3 is fitted with the limiting plate 13. At this time, the upper surface of the positioning ring 31 is flush with the lower surface of the limiting protrusion 14. Subsequently, the sealing material can be injected to fill the gap between the non-return device 3 and the inner wall of the main body 1. When the filling is completed, the connecting joint 11 can be assembled on the main body 1. Therefore, during the application process, if the check valve 3 is to be separated from the main body 1, the following two conditions need to be met: the axis of the check valve 3 coincides with the axis of the main body 1, and the direction of the applied external force coincides with the axis of the main body 1. However, in the use state, the stress state of the check valve 3 is not uniform and full of randomness, and the probability of satisfying the above two conditions at the same time is extremely low. On the other hand, when filling the sealing material, the filling cannot be completely uniform, and there must be a certain error. This error will cause the axis of the check valve 3 to no longer coincide with the axis of the main body 1, thereby enabling the limiting protrusion 14 and the limiting plate 13 to clamp the check valve 3, which further reduces the possibility of the check valve 3 falling off. In summary, based on the above content, the main body 1, the limiting plate 13, and the limiting protrusion 14 can be formed in one piece. In particular, the main body 1 does not need to be welded in sections, thereby effectively enhancing the structural strength of the main body 1.

[0028] In actual application, the utility model is assembled on the grouting pipe through the connecting joint 11. The grouting pipe is fixed on the main reinforcement of the steel cage. In actual conditions, there are multiple grouting pipes, and each grouting pipe should be equipped with one of the present devices. As the first section of the steel cage is lowered, the present device gradually enters the pre-dug hole. When the first section of the steel cage moves to the bottom of the hole, because the main body 1 itself is in the shape of a narrow column, the present device can pass through the sediment layer and be inserted into the bearing layer. In the process of inserting into the bearing layer, protected by the rubber 2, external silt, sediment and other impurities will not enter the main body 1 through the slurry outlet 12 in the reverse direction. It is worth noting that when the steel cage is lowered, the hole is filled with wall protection slurry. In order to balance the external pressure, it is necessary to fill the grouting pipe and the main body 1 with clean water.

[0029] After the steel cage is installed, cement slurry is poured through the grouting pipe. The cement slurry enters the main body 1 through the connecting joint 11, and finally enters the bearing layer through the slurry outlet hole 12. During this process, the pressure of the poured cement slurry should meet the index. The rubber 2 will undergo elastic deformation under the pressure of the cement slurry, so that a gap appears between the rubber 2 and the main body 1. Thus, after the cement slurry passes through the slurry outlet hole 12, it enters the bearing layer through the gap between the rubber 2 and the main body 1. At the same time, during the deformation of the rubber 2, the positioning pin 211 will position the rubber 2 through the slurry outlet hole 12 to prevent the rubber 2 from falling off the main body 1.

[0030] As the cement slurry is poured, it will enter the sediment layer from the bearing layer and eventually penetrate, fill, compact, and consolidate the sediment in the sediment layer, so that the originally loose sediment in the sediment layer is bonded with the cement slurry to form a high-strength combination, thereby improving the mechanical properties of the bearing layer. At the same time, an enlarged head is formed at the pile end, thereby enhancing the bearing capacity of the pile foundation and making the bearing capacity of the pile foundation meet the requirements. On the other hand, under a sufficiently large pressure of the cement slurry, the cement slurry will flow back along the pile body of the cast-in-place pile, consolidating the mud skin and soil around the pile, increasing the friction resistance between the pile body and the surrounding soil, and further enhancing the bearing capacity of the pile foundation. In summary, through the present utility model, the original surface construction is converted into multiple point construction. Without increasing the construction area, the construction area is reduced, thereby effectively reducing the adverse effects of the construction process on the stratum and groundwater, and avoiding unnecessary environmental damage. At the same time, the construction period is shortened and resource loss during construction is reduced.

[0031] On the other hand, when the pouring of cement slurry is stopped, the main body 1 needs to bear the pressure of the surrounding cement slurry (equivalent to the internal pressure of the main body 1 during pouring). Under the action of the surrounding pressure, the outer rubber 22 will compress the inner rubber 21 and the positioning nail 211 at the same time. The diameter of the nail cap of the positioning nail 211 is larger than the diameter of the slurry outlet 12. At this time, the positioning nail 211 will compress the inner rubber 21, so that the inner rubber 21 and the main body 1 fit more tightly. In summary, it can effectively prevent the cement slurry from flowing back into the main body 1 through the slurry outlet 12 after the pouring of cement slurry is stopped. Similarly, the check valve 3 serves as the second line of defense to prevent the cement slurry from flowing back. In summary, after the pouring of cement slurry is completed, the utility model does not require other equipment to assist in balancing the internal and external pressures of the main body 1, thereby saving energy loss in construction. On the other hand, it effectively improves the success rate of construction, thereby avoiding unnecessary resource loss due to construction failure.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A grouting device for a bored pile tip, characterized by: include: Subject (1); The main body (1) is columnar; A cavity is provided in the main body (1); The main body (1) is provided with a pulp outlet hole (12), and the pulp outlet hole (12) is communicated with the cavity; One end of the main body (1) is provided with a connecting joint (11); The connection joint (11) can be connected to a grouting pipe to introduce cement slurry into the main body (1).

2. The pile tip grouting device according to claim 1, characterized in that: The diameter of the connecting joint (11) gradually decreases from the grouting pipe to the main body (1).

3. The pile tip grouting device according to claim 1, characterized in that: Also includes a rubber (2); The number of the pulp outlet holes (12) is multiple; The slurry outlet holes (12) are arranged along the axial direction of the main body (1); The rubber (2) is coated on the main body (1); The rubber (2) covers the pulp outlet hole (12).

4. The pile tip grouting device according to claim 3, characterized in that: The rubber (2) comprises an inner rubber layer (21) and an outer rubber layer (22); The inner rubber layer (21) is coated on the main body (1); The inner rubber layer (21) covers the pulp outlet hole (12); The outer rubber layer (22) is coated on the inner rubber layer (21).

5. The pile tip grouting device according to claim 4, characterized in that: Positioning pins (211) are provided on the inner rubber layer (21); The positioning nail (211) passes through the inner rubber layer (21); The positioning pin (211) extends into the pulp outlet hole (12); The outer rubber layer (22) covers the positioning pin (211).

6. The pile tip grouting device according to claim 1, characterized in that: Also includes a non-return device (3); The non-return device (3) is arranged in the main body (1); The output flow direction of the non-return device (3) is directed from the connecting joint (11) to the pulp outlet hole (12).

7. The pile tip grouting device according to claim 6, characterized in that: A limiting plate (13) and a limiting protrusion (14) are also provided in the main body (1); The limiting plate (13) is arranged at one end of the check valve (3) close to the pulp outlet hole (12); The limiting plate (13) is fitted with the non-return device (3); The limiting protrusion (14) is arranged at an end of the check valve (3) away from the pulp outlet hole (12).

8. The pile tip grouting device according to claim 7, characterized in that: The non-return device (3) is provided with a positioning ring (31); The upper surface of the positioning ring (31) is flush with the lower surface of the limiting protrusion (14); The sum of the diameter of the positioning ring (31) and the distance that the limiting protrusion (14) protrudes from the inner wall of the main body (1) is equal to the inner diameter of the main body (1).

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