Composite post grouting device

Abstract

The utility model provides a kind of composite post grouting device, it is related to pile foundation post grouting technical field, including bottom plate, bottom plate is provided with the first via hole through in thickness direction;First grouting pipe and second grouting pipe are connected in one side in bottom plate thickness direction, and the bottom end of first grouting pipe is set in the first via hole;Capsule is connected in the other side in bottom plate thickness direction, and the bottom end of second grouting pipe extends into capsule.The utility model's composite post grouting device is lowered, and cement paste in the bottom of pile hole can pass through the first via hole, avoid the problem that steel reinforcement cage is difficult to lower due to capsule in pure closed type grouting method, improve construction efficiency, and respectively through first grouting pipe and second grouting pipe carry out grouting work, and pile foundation combines the advantage of open type grouting method and closed type grouting method, capsule expansion compacts and compacts pile bottom soil layer, forms enlarged head, simultaneously strengthens the side friction between the lower part of pile body and soil layer, improves the bearing capacity of pile foundation.

Description

Technical Field

[0001] This utility model relates to the field of post-grouting technology for pile foundations, and more specifically, to a composite post-grouting device. Background Technology

[0002] Post-grouting technology is used in bridge bored pile foundations to improve the bonding strength between the pile foundation and the soil layer, thereby improving the bearing capacity of the pile foundation. Existing technologies include open post-grouting technology and closed post-grouting technology.

[0003] Open-type post-grouting technology involves fixing grouting pipes to the pile foundation reinforcement cage. These grouting pipes include vertical and circumferential grouting pipes, enabling open-type grouting on the pile side and at the pile bottom. The grout injected by open-type post-grouting technology is directly sprayed onto the soil layer around the pile to solidify the soil. However, due to the high pressure of post-grouting at the pile bottom, open-type grouting is mostly done in the form of split grouting. The controllability of the grout injection area is low. Under high pressure, the grout flows around along the cracks in the sand, soil, and gravel layers. The injected grout may not be concentrated at the pile bottom. The grouting pressure and volume are difficult to control, making it difficult to meet design requirements. This results in poor stability of the grouting effect, leading to large fluctuations in the pile foundation bearing capacity, i.e., the stability of the improved pile foundation bearing capacity is not good enough.

[0004] Closed-loop post-grouting technology involves placing a circular grouting capsule at the bottom of the pile foundation's reinforcing cage. A grouting pipe extends into the capsule, and after the pile concrete is poured, grout is injected into the capsule through the grouting pipe, forming an enlarged head at the pile bottom. This compacts the soil layer at the pile bottom and increases the bearing capacity of the pile end. In closed-loop post-grouting technology, the injected grout is mainly concentrated inside the circular capsule. The pressure is transmitted to the soil layer through the pressure-expanding capsule, resulting in a compaction effect. However, bored piles use mud slurry for wall protection. Since the bottom of the drilled pile hole is filled with mud slurry, the reinforcing cage containing the steel plate capsule acts like a piston during the lowering process, making it difficult for the mud slurry to be discharged upwards, which makes lowering the reinforcing cage very difficult. Utility Model Content

[0005] The purpose of this invention is to provide a composite post-grouting device to improve the above-mentioned problems. To achieve this purpose, the technical solution adopted by this invention is as follows:

[0006] This application provides a composite post-grouting device, comprising: a base plate having a first through hole extending in the thickness direction; a first grouting pipe connected to one side of the base plate in the thickness direction, the bottom end of the first grouting pipe being disposed within the first through hole; a second grouting pipe connected to one side of the base plate in the thickness direction; and a capsule connected to the other side of the base plate in the thickness direction, the bottom end of the second grouting pipe extending into the capsule.

[0007] According to some embodiments of the present invention, a grid plate is also included, which is located in the first through hole and connected to the base plate. The grid plate is provided with a plurality of second through holes that extend through in the thickness direction. The bottom end of the first grouting pipe passes through one of the second through holes and extends to the other side of the base plate in the thickness direction.

[0008] According to some embodiments of the present invention, the plurality of second through holes each include at least one first hole and a plurality of second holes, the first grouting pipe passes through one of the second holes and extends to the other side in the thickness direction of the bottom plate, and the inner diameter of the first hole is larger than the inner diameter of the second hole.

[0009] According to some embodiments of this utility model, the inner diameter of the first hole is d1, which satisfies: 150mm≤d1≤300mm, and the inner diameter of the second hole is d2, which satisfies: 20mm≤d2≤30mm.

[0010] According to some embodiments of the present invention, the second grouting pipe is constructed in multiple ways, with the bottom ends of the multiple second grouting pipes extending into the capsule and connected and communicating with the horizontal pipe, and at least one end of the horizontal pipe being selectively connected to the capsule.

[0011] According to some embodiments of the present invention, at least one end of the horizontal tube is provided with a one-way grouting valve, which is adapted to connect the horizontal tube to the capsule when the pressure in the horizontal tube exceeds a threshold.

[0012] According to some embodiments of the present invention, it further includes an inner ring plate and an outer ring plate disposed on the other side of the thickness direction of the base plate. The inner ring plate is disposed around the outer periphery of the first through hole and connected to the base plate. The outer ring plate is disposed around the outer periphery of the base plate and connected to the base plate. The capsule extends along the circumference of the base plate and is connected to the inner ring plate and the outer ring plate respectively.

[0013] According to some embodiments of the present invention, a plurality of vertical ribs are provided on one side of the base plate in the thickness direction, and the plurality of vertical ribs are distributed at intervals along the circumference of the base plate.

[0014] According to some embodiments of the present invention, it further includes a plurality of annular reinforcing ribs, which are respectively connected to the first grouting pipe, the second grouting pipe and a plurality of vertical ribs, and the plurality of annular reinforcing ribs are distributed at intervals between each other.

[0015] According to some embodiments of the present invention, a spiral stirrup is also included, which is disposed at one end of the plurality of vertical ribs away from the bottom plate, and the spiral stirrup is respectively connected to the first grouting pipe, the second grouting pipe and the plurality of vertical ribs.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention, by setting a first through hole on the base plate, allows the cement grout at the bottom of the pile hole to be smoothly discharged when the composite post-grouting device is lowered. This avoids the problem of difficulty in lowering the reinforcing cage caused by the presence of the capsule in the simple closed grouting method, thus improving construction efficiency. Moreover, the grouting work is carried out through the first grouting pipe and the second grouting pipe respectively, so that the pile foundation combines the advantages of the open grouting method and the closed grouting method. The expansion of the capsule compacts the soil layer at the bottom of the pile, forming an enlarged head, while enhancing the lateral friction between the lower part of the pile body and the soil layer, thereby improving the bearing capacity of the pile foundation.

[0018] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the composite post-grouting device of this utility model;

[0021] Figure 2 This is a schematic diagram showing the fit between the base plate, the second grouting pipe, and the first grouting pipe of this utility model;

[0022] Figure 3 This is a schematic diagram showing the fit between the base plate and the first grouting pipe of this utility model;

[0023] Figure 4 This is a schematic diagram showing the fit between the base plate and the second grouting pipe of this utility model;

[0024] Figure 5 This is a schematic diagram showing the fit between the base plate and the horizontal pipe of this utility model.

[0025] Marked in the image:

[0026] 10. Base plate; 11. Inner ring plate; 12. Outer ring plate; 20. First grouting pipe; 30. Second grouting pipe; 40. Capsule; 50. Grid plate; 51. First hole; 52. Second hole; 60. Horizontal pipe; 61. One-way grouting valve; 70. Vertical reinforcement; 80. Circular reinforcing rib; 90. Spiral hoop. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-5 As shown, this embodiment provides a composite post-grouting device, including: a base plate 10, a first grouting pipe 20, a second grouting pipe 30, and a capsule 40. The base plate 10 is provided with a first through hole in the thickness direction. The first grouting pipe 20 is connected to one side of the base plate 10 in the thickness direction, and the bottom end of the first grouting pipe 20 is disposed in the first through hole. The second grouting pipe 30 is connected to one side of the base plate 10 in the thickness direction, and the capsule 40 is connected to the other side of the base plate 10 in the thickness direction. The bottom end of the second grouting pipe 30 extends into the capsule 40.

[0030] In some embodiments, the base plate 10 is provided with a first through hole extending in its own thickness direction. The first through hole is adapted to provide a channel for cement slurry discharge and cleaning operations. The thickness direction of the base plate 10 is parallel to the gravity direction. A first grouting pipe 20 is connected to one side of the base plate 10 in the thickness direction, and the extension direction of the first grouting pipe 20 is parallel to the gravity direction. The bottom end of the first grouting pipe 20 is disposed in the first through hole. Thus, the first grouting pipe 20 can perform pressure grouting to the other side of the base plate 10 through the first through hole. A second grouting pipe 30 is also connected to one side of the base plate 10 in the thickness direction, that is, the second grouting pipe 30 and the first grouting pipe 20 are on the same side of the base plate 10, and the extension direction of the second grouting pipe 30 is parallel to the gravity direction. A capsule 40 is connected to the other side of the base plate 10 in the thickness direction. The bottom end of the second grouting pipe 30 extends into the capsule 40. Cement slurry can enter the capsule 40 through the second grouting pipe 30 so that the capsule 40 can expand during the grouting process.

[0031] It is understandable that the installation of pile foundations requires drilling the ground to form pile holes (the depth of the pile hole is h, satisfying: h≥10m). During the drilling process, cement slurry is sprayed to form mud slurry protection on the inner wall of the pile hole, thereby reducing the collapse of the pile hole. However, after the drilling is completed, cement slurry will accumulate at the bottom of the pile hole. The bottom plate 10 of the composite post-grouting device of this application has the side with the capsule 40 facing the bottom of the pile hole. Therefore, during the process of lowering the composite post-grouting device to the bottom of the pile hole, the cement slurry accumulated at the bottom of the pile hole can enter the other side of the bottom plate 10 through the first through hole of the bottom plate 10, so that the composite post-grouting device can be lowered smoothly.

[0032] When the composite post-grouting device is lowered to the bottom of the pile hole, the operator uses a special hole cleaning device to clean both sides of the base plate 10 in the thickness direction. Then the operator injects concrete into the pile hole. After the concrete solidifies, it forms a pile foundation together with the composite post-grouting device. Then, the construction personnel can perform pressure grouting through the first grouting pipe 20 and the second grouting pipe 30.

[0033] During grouting, pressure grouting is first performed through the first grouting pipe 20. At this time, cement grout is injected into the sediment and strata at the pile base through the first grouting pipe 20 to achieve open-type post-grouting operation. The cement grout then rises along the inner wall of the pile hole. The solidified concrete increases the friction of the outer perimeter of the pile foundation, thus increasing the lateral friction between the lower part of the pile and the soil layer, thereby improving the stability of the pile foundation. Subsequently, pressure grouting is performed through the second grouting pipe 30 to achieve closed-type post-grouting operation. At this time, cement grout is injected through the second grouting pipe 30... The second grouting pipe 30 enters the capsule 40, which expands and forms an enlarged head at the base of the pile to compact the soil layer at the base of the pile, thereby increasing the bearing capacity of the pile foundation and improving the bonding strength between the pile foundation and the soil layer. Finally, pressure grouting is performed again through the first grouting pipe 20. Due to the closed-loop grouting operation, the capsule 40 expands, which prevents the cement grout from returning. At this time, the cement grout can further split and penetrate downwards around the bottom of the pile foundation, thereby further reinforcing the bottom of the pile foundation and making the bonding between the pile foundation and the soil layer more stable.

[0034] It should be noted that cleaning one side of the base plate 10 in the thickness direction is to avoid the presence of sediment on the base plate 10, thereby ensuring the bonding stability between the concrete and the base plate 10 after solidification. Cleaning the other side of the base plate 10 in the thickness direction is to control the thickness of sediment below the base plate 10, so that the sediment thickness meets the construction requirements.

[0035] According to the composite post-grouting device of this utility model, by setting a first through hole on the base plate 10, the cement grout at the bottom of the pile hole can be smoothly discharged when the composite post-grouting device is lowered, avoiding the problem of difficulty in lowering the steel cage caused by the presence of capsule 40 in the simple closed grouting method, thus improving construction efficiency. Moreover, grouting work is carried out through the first grouting pipe 20 and the second grouting pipe 30 respectively, so that the pile foundation combines the advantages of open grouting method and closed grouting method. The expansion of capsule 40 compacts and compacts the soil layer at the bottom of the pile to form an enlarged head, while enhancing the lateral friction, adhesion and fit strength between the lower part of the pile body and the soil layer, thus improving the bearing capacity of the pile foundation.

[0036] In some embodiments, the strength of the cement grout is not lower than the strength of the pile concrete, and the water-cement ratio of the grout is determined based on the soil saturation and permeability. Preferably, for saturated soil, the water-cement ratio is 0.6 to 0.8; for unsaturated soil, the water-cement ratio is 0.7 to 0.8.

[0037] According to some embodiments of the present invention, the composite post-grouting device further includes a grid plate 50, which is located in the first through hole and connected to the bottom plate 10. The grid plate 50 is provided with a plurality of second through holes that extend through in the thickness direction. The bottom end of the first grouting pipe 20 passes through one of the second through holes and extends to the other side of the bottom plate 10 in the thickness direction.

[0038] In some embodiments, the grid plate 50 is disposed within the first through hole of the base plate 10 and connected to the base plate 10, making the grid plate 50 an integral part of the structure of the base plate 10, together forming the bottom support and fluid channel system of the composite post-grouting device. The grid plate 50 is provided with a plurality of second through holes extending in the thickness direction, providing channels for cement slurry and any debris. The bottom end of the first grouting pipe 20 passes through one of the second through holes and extends to the other side of the base plate 10 in the thickness direction, ensuring that the first grouting pipe 20 can perform grouting operations normally, while also fixing and defining the position of the first grouting pipe 20 through the grid plate 50.

[0039] According to some embodiments of the present invention, the plurality of second through holes respectively include at least one first hole 51 and a plurality of second holes 52. The first grouting pipe 20 passes through a second hole 52 and extends to the other side in the thickness direction of the bottom plate 10. The inner diameter of the first hole 51 is larger than the inner diameter of the second hole 52.

[0040] In some embodiments, the plurality of second through holes each include a first hole 51 and a plurality of second holes 52. The geometric center of the grid plate 50 is located within the first hole 51, and the plurality of second holes 52 are respectively arranged at circumferential intervals along the first hole 51. The diameter of the first hole 51 is larger than the diameter of the second hole 52. The first hole 51 is suitable for the passage of cement slurry and provides an operating channel for a dedicated hole cleaning device, thereby facilitating the hole cleaning operation. The second holes 52 are suitable for the passage of the first grouting pipe 20, and the second through holes can block coarse aggregate in the concrete, preventing coarse aggregate in the concrete from entering below the bottom plate 10, thereby preventing coarse aggregate from clogging the first grouting pipe 20.

[0041] Specifically, the inner diameter of the first hole 51 is d1, which satisfies: 150mm≤d1≤300mm, and the inner diameter of the second hole 52 is d2, which satisfies: 20mm≤d2≤30mm.

[0042] During pile foundation construction, various debris of different sizes may exist at the bottom of the pile hole, such as large pieces of soil and rock, concrete fragments, etc. In this application, the inner diameter of the first hole 51 is designed in a relatively large range of 150mm-300mm to ensure that these large particles of debris can pass smoothly through the grid plate 50, and to avoid debris accumulating at the grid plate 50 due to the small hole diameter, thereby avoiding blockage of the grout discharge channel and thus avoiding affecting the normal lowering and grout discharge function of the composite post-grouting device.

[0043] Meanwhile, this application designs the inner diameter of the second hole 52 within a small range of 20mm-30mm, so that the second hole 52 can block the coarse aggregate in the concrete and prevent the coarse aggregate in the concrete from entering below the bottom plate 10.

[0044] In some embodiments, the thickness of the base plate 10 is 3-5mm, and the material is Q235 or Q355; the thickness of the grid plate 50 is 3-5mm, and the material is Q235 or Q355; the inner diameter of the first grouting pipe 20 is 40mm, and the inner diameter of the second grouting pipe 30 is 50mm. This can help construction personnel quickly distinguish between the first grouting pipe 20 and the second grouting pipe 30, solve technical problems such as poor grouting and pipe blockage caused by using the wrong grouting pipe, and improve on-site construction efficiency.

[0045] According to some embodiments of the present invention, multiple second grouting pipes 30 are constructed, with the bottom ends of each second grouting pipe 30 extending into the capsule 40 and connecting and communicating with the horizontal pipe 60. At least one end of the horizontal pipe 60 is optionally connected to the capsule 40. At least one end of the horizontal pipe 60 is provided with a one-way grouting valve 61, which is adapted to connect the horizontal pipe 60 to the capsule 40 when the pressure inside the horizontal pipe 60 exceeds a threshold.

[0046] In some embodiments, the number of second grouting pipes 30 can be two, three, four or more, and there is no limitation here. When there are two second grouting pipes 30, the two second grouting pipes 30 are respectively connected to the horizontal pipe 60. At this time, the pile foundation strength can be tested using the two grouting pipes. Specifically, by filling the two second grouting pipes 30 with water, and then testing the second grouting pipes 30 with an ultrasonic testing instrument, the strength of the pile foundation structure can be tested.

[0047] It should be noted that after the pile foundation structure strength test is completed, pressure grouting is performed into one of the second grouting pipes 30. At this time, the cement grout will squeeze the water in the second grouting pipe 30 and the horizontal pipe 60, causing the water to be discharged through the other second grouting pipe 30, thus preventing water from entering the capsule 40 and affecting the setting rate and strength of the cement grout inside the capsule 40. After cement grout begins to emerge from the other second grouting pipe 30, the top of the other second grouting pipe 30 is sealed. At this time, the pressure in the horizontal pipe 60 and the second grouting pipe 30 begins to increase. When the pressure in the horizontal pipe 60 exceeds the threshold, the one-way grouting valve 61 opens to connect the horizontal pipe 60 and the capsule 40. At this time, the cement grout can enter the capsule 40 after passing through the second grouting pipe 30 and the horizontal pipe 60 in sequence.

[0048] In other embodiments, the structural strength of the pile foundation can also be tested using the first grouting pipe 20. Specifically, during testing, the first grouting pipe 20 is first filled with water, and then tested using an ultrasonic testing instrument. After the pile foundation structural strength test is completed, cement grout is directly injected into the first grouting pipe 20, which can force the water in the first grouting pipe 20 into the soil layer. Preferably, the number of first grouting pipes 20 can be 2, 3, 4 or more, and there is no limitation here.

[0049] According to some embodiments of the present invention, the composite post-grouting device further includes an inner ring plate 11 and an outer ring plate 12 disposed on the other side of the thickness direction of the base plate 10. The inner ring plate 11 is disposed around the outer periphery of the first through hole and connected to the base plate 10. The outer ring plate 12 is disposed around the outer periphery of the base plate 10 and connected to the base plate 10. The capsule 40 extends along the circumference of the base plate 10 and is connected to the inner ring plate 11 and the outer ring plate 12 respectively.

[0050] In some embodiments, the inner ring plate 11 is arranged around the outer periphery of the first through hole, which can protect the first through hole and prevent debris, soil, etc. from the other side of the base plate 10 from entering the first through hole during construction, so as to avoid interference and damage to the structure or grout flow in the first through hole; the outer ring plate 12 is arranged around the outer periphery of the base plate 10 and connected to the base plate 10 to improve the overall structural strength and rigidity of the base plate 10, so that the base plate 10 is not easily deformed or damaged when subjected to various loads generated during construction, such as grout pressure and soil pressure, thus ensuring the stability and reliability of the composite post-grouting device.

[0051] Of course, the inner ring plate 11 and the outer ring plate 12 provide connection support points for the capsule 40. The capsule 40 is connected to the inner ring plate 11 and the outer ring plate 12, which can ensure that the capsule 40 extends and is fixed in the circumference of the bottom plate 10, forming a closed space. This is conducive to the uniform expansion of the capsule 40 during grouting, so as to effectively reinforce the soil around the pile foundation.

[0052] It should be noted that the connection between the capsule 40 and the inner ring plate 11 and the outer ring plate 12 can be achieved by heat fusion, rivets, fasteners or other methods, without limitation, to ensure a firm connection between the capsule 40 and the inner ring plate 11 and the outer ring plate 12 and to prevent it from falling off.

[0053] Preferably, both the inner ring plate 11 and the outer ring plate 12 are steel plates with a thickness of 3-5mm and are made of Q235 or Q355. The capsule 40 is a closed-loop grout storage structure. The capsule 40 is made of rubber material, and the wall thickness of the capsule 40 is ≥2mm, the elongation of the capsule 40 is ≥400%, and the tensile strength of the capsule 40 is ≥14MPa.

[0054] According to some embodiments of the present invention, a plurality of vertical ribs 70 are provided on one side of the base plate 10 in the thickness direction, and the plurality of vertical ribs 70 are distributed at intervals along the circumference of the base plate 10.

[0055] In some embodiments, the first grouting pipe 20, the second grouting pipe 30, and the plurality of vertical ribs 70 are all located on the same side of the base plate 10, and the extension direction of the vertical ribs 70 is parallel to the direction of gravity. The first grouting pipe 20, the second grouting pipe 30, and the plurality of vertical ribs 70 can be jointly constructed as the skeleton of the pile foundation to improve the structural strength of the pile foundation.

[0056] According to some embodiments of the present invention, the composite post-grouting device further includes a plurality of annular reinforcing ribs 80, which are respectively connected to the first grouting pipe 20, the second grouting pipe 30 and a plurality of vertical ribs 70, and the plurality of annular reinforcing ribs 80 are distributed at intervals to each other.

[0057] In some embodiments, multiple annular reinforcing ribs 80 can make the connection between the first grouting pipe 20, the second grouting pipe 30 and multiple vertical ribs 70 more stable, thereby making the structure of the composite post-grouting device more stable, and thus making the lowering of the composite post-grouting device smoother. Of course, the setting of multiple annular ribs can also enhance the bonding strength between the composite post-grouting device and the concrete, thereby improving the structural strength of the pile foundation.

[0058] In other embodiments, the first grouting pipe 20 includes a first vertical section, a horizontal section, and a second vertical section connected in sequence. The distance from the first vertical section to the geometric center of the base plate 10 is L1. The projection of the second vertical section in the direction of gravity is located within the grid plate 50. The distance from the second grouting pipe 30 to the geometric center of the base plate 10 is L2. The distance from the vertical rib 70 to the geometric center of the base plate 10 is L3, satisfying: L1=L2=L3. Thus, the above arrangement makes the connection between the annular reinforcing rib 80 and the first grouting pipe 20, the second grouting pipe 30, and the multiple vertical ribs 70 more convenient, improving the production efficiency of the composite post-grouting device.

[0059] According to some embodiments of the present invention, the composite post-grouting device further includes a spiral stirrup 90, which is disposed at one end of a plurality of vertical ribs 70 away from the bottom plate 10, and the spiral stirrup 90 is connected to the second grouting pipe 30, the first grouting pipe 20 and the plurality of vertical ribs 70 respectively.

[0060] It is understandable that the spiral stirrups 90 are connected to the second grouting pipe 30, the first grouting pipe 20 and multiple vertical bars 70 respectively, so as to further improve the connection stability of the first grouting pipe 20, the second grouting pipe 30 and multiple vertical bars 70, thereby further improving the structural stability of the composite post-grouting device. At the same time, it can further strengthen the bonding strength between the composite post-grouting device and the concrete, so as to improve the structural strength of the pile foundation.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A composite post-grouting device, characterized in that, include: The base plate (10) is provided with a first through hole extending in the thickness direction; The first grouting pipe (20) is connected to one side of the base plate (10) in the thickness direction, and the bottom end of the first grouting pipe (20) is disposed in the first through hole; The second grouting pipe (30) is connected to one side of the base plate (10) in the thickness direction; Capsule (40), the capsule (40) is connected to the other side of the base plate (10) in the thickness direction, and the bottom end of the second grouting pipe (30) extends into the capsule (40).

2. The composite post-grouting device according to claim 1, characterized in that, It also includes a grid plate (50) located in the first through hole and connected to the base plate (10). The grid plate (50) is provided with a plurality of second through holes that extend through in the thickness direction. The bottom end of the first grouting pipe (20) passes through one of the second through holes and extends to the other side of the base plate (10) in the thickness direction.

3. The composite post-grouting device according to claim 2, characterized in that, The plurality of second through holes each include at least one first hole (51) and a plurality of second holes (52), the first grouting pipe (20) passes through one of the second holes (52) and extends to the other side in the thickness direction of the base plate (10), and the inner diameter of the first hole (51) is larger than the inner diameter of the second hole (52).

4. The composite post-grouting device according to claim 3, characterized in that, The inner diameter of the first hole (51) is d1, which satisfies: 150mm≤d1≤300mm, and the inner diameter of the second hole (52) is d2, which satisfies: 20mm≤d2≤30mm.

5. The composite post-grouting device according to claim 1, characterized in that, The second grouting pipe (30) is constructed in multiple ways. The bottom ends of the multiple second grouting pipes (30) extend into the capsule (40) and are connected and communicate with the horizontal pipe (60). At least one end of the horizontal pipe (60) is optionally connected to the capsule (40).

6. The composite post-grouting device according to claim 5, characterized in that, At least one end of the horizontal tube (60) is provided with a one-way grouting valve (61), which is adapted to connect the horizontal tube (60) to the capsule (40) when the pressure in the horizontal tube (60) exceeds a threshold.

7. The composite post-grouting device according to claim 1, characterized in that, It also includes an inner ring plate (11) and an outer ring plate (12) disposed on the other side of the thickness direction of the base plate (10). The inner ring plate (11) is disposed around the outer periphery of the first through hole and connected to the base plate (10). The outer ring plate (12) is disposed around the outer periphery of the base plate (10) and connected to the base plate (10). The capsule (40) extends along the circumference of the base plate (10) and is connected to the inner ring plate (11) and the outer ring plate (12) respectively.

8. The composite post-grouting device according to claim 1, characterized in that, The base plate (10) has a plurality of vertical ribs (70) on one side in the thickness direction, and the plurality of vertical ribs (70) are distributed at intervals along the circumference of the base plate (10).

9. The composite post-grouting device according to claim 8, characterized in that, It also includes multiple annular reinforcing ribs (80), which are respectively connected to the first grouting pipe (20), the second grouting pipe (30) and multiple vertical ribs (70), and the multiple annular reinforcing ribs (80) are distributed at intervals to each other.

10. The composite post-grouting device according to claim 9, characterized in that, It also includes spiral stirrups (90), which are disposed at the ends of the plurality of vertical bars (70) away from the bottom plate (10). The spiral stirrups (90) are respectively connected to the first grouting pipe (20), the second grouting pipe (30) and the plurality of vertical bars (70).

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