Pile side grouting structure, manufacturing method and grouting method

Abstract

The invention discloses a pile side grouting structure, a manufacturing method and a grouting method.The pile side grouting structure comprises a grouting pipe and a pipe body fixing device; the grouting pipe is spirally arranged on the outer side of the pipe pile; a plurality of grout overflow holes are formed in the grouting pipe in the length direction of the grouting pipe; the inlet end of the grouting pipe can be connected with a high-pressure grouting pump; a pipe body fixing device is arranged at the upper end and / or the lower end of the pipe pile; and the grouting pipe is connected with the pipe body fixing device. According to the pile side grouting structure, the grout is evenly poured into the gap between the pipe pile and the soil body around the pipe pile in a spiral grouting mode, the problem that the grout on the outer side of the pipe pile is prone to being unevenly grouted in the construction engineering of a while-drilling and pipe pile method is solved, and the construction quality of the pipe pile is improved. According to the manufacturing method, the pile side grouting structure and the pipe pile can be conveniently fixed together. According to the grouting method, people can be guided to uniformly fill the grout into the gap between the pipe pile and the soil body around the pile, and the side friction resistance of the pile can be improved.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation grouting technology, specifically relating to a pile side grouting structure, manufacturing method, and grouting method. Background Technology

[0002] Drilling while driving (DWD) is a novel pile foundation construction method. During construction, a drill rod with a drill bit is inserted into the inner hole of the pipe pile. Drilling proceeds simultaneously with the pipe pile, and the rod can be lifted to reconnect the pile. The final hole is reached at the designed elevation. Excavated soil is discharged from the inner hole of the pipe pile through the helical blades of the drill rod. Underwater concrete is poured into the pile end to seal the pile. Cement mortar is then poured into the outer wall of the pipe pile to enhance its bearing capacity. This construction method offers advantages such as rapid construction speed, high single-pile bearing capacity, stable and reliable pile quality, environmental friendliness, and strong adaptability to geological formations. This method eliminates the need for hammering and static pressure, maintaining the integrity of the pipe pile during construction. It is a novel pile foundation construction method with broad application prospects. However, this technology creates a gap of approximately 10mm between the pipe pile and the surrounding soil, requiring the filling of this gap with cement grout or cement mortar to increase the pile's side friction. The current drilling and pipe pile construction technology involves vertically arranging grouting pipes from top to bottom, with only one grout outlet at the bottom of the pile. This makes it impossible to meet the requirement of uniform grouting around the pile during the grouting process, which poses safety hazards to the construction and also affects the normal use of the pipe piles.

[0003] Currently, it is necessary to develop a pile-side grouting structure to address the problem of uneven grouting on the outside of the pipe pile during drilling and pipe pile construction, thereby improving the construction quality of the pipe pile. Simultaneously, it is necessary to develop a fabrication method for the pile-side grouting structure to facilitate its fixation to the pipe pile, thus improving its operational stability. Furthermore, it is essential to develop a grouting method for the pile-side grouting structure to guide the uniform filling of the grout into the gap between the pipe pile and the surrounding soil, thereby increasing the pile-side friction resistance. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a pile-side grouting structure that can solve the problem of uneven grouting on the outside of the pipe pile in drilling and pipe pile construction projects, thereby improving the construction quality of the pipe pile.

[0005] The present invention adopts the following technical solution: A pile-side grouting structure includes a grouting pipe and a pipe fixing device; the grouting pipe is spirally arranged on the outside of the pipe pile; the grouting pipe has a plurality of overflow holes along its length; the overflow holes are provided with plugs; the inlet end of the grouting pipe can be connected to a high-pressure grouting pump; the upper end and / or lower end of the pipe pile are provided with the pipe fixing device; the grouting pipe is connected to the pipe fixing device.

[0006] Furthermore, the grouting pipe is installed in the concrete protective layer of the pipe pile, and the overflow hole is set facing the outer side of the pipe pile body. The overflow hole is used to grout and fill the gap between the pipe pile and the surrounding soil.

[0007] Furthermore, the upper and lower ends of the pipe pile are respectively provided with the pipe body fixing device; The pipe fixing device includes an end plate, a fixing component, and a connecting sleeve; The end plate is connected to the internal steel reinforcement of the pipe pile, and after the end plate is installed, it is located at the end of the pipe pile; The fixing member is connected to the end plate; the connecting sleeve is disposed on the fixing member; one end of the grouting pipe is connected to the connecting sleeve.

[0008] Furthermore, a pile-side grouting structure also includes a grout return pipe; the grout return pipe is disposed in the pipe pile; the lower end of the grout return pipe is connected to or not connected to the lower end of the grouting pipe; the upper end of the grout return pipe is connected to the top of the pipe pile.

[0009] Furthermore, the grout return pipe is installed in a straight path within the pipe pile, or the grout return pipe is installed in a spiral path within the pipe pile.

[0010] Furthermore, a pile-side grouting structure also includes a pipe body connecting device; several sections of pipe piles are connected to form a long pipe pile of a set length, and the grouting pipes on adjacent pipe piles are connected through the pipe body connecting device.

[0011] Furthermore, a pile-side grouting structure also includes a grout return pipe; the grout return pipe is disposed in the pipe pile; A pile-side grouting structure further includes a pipe body connecting device; several sections of pipe piles are connected to form a long pipe pile of a set length, and the grout return pipes on adjacent pipe piles are connected through the pipe body connecting device.

[0012] Furthermore, the grouting pipe is spirally arranged in the first pipe pile; the return grout pipe is straight or spirally arranged in the first pipe pile; in the first pipe pile, the lower end of the grouting pipe and the lower end of the return grout pipe are connected. A pile-side grouting structure further includes a second grouting pipe and a second return grouting pipe; the second grouting pipe is straight-lined in the second pipe pile; the second return grouting pipe is straight-lined in the second pipe pile; At least one second pipe pile is connected to the first pipe pile to form a long pipe pile. The second grouting pipe in the second pipe pile is connected to the grouting pipe in the first pipe pile through a pipe body connecting device. The second return grouting pipe in the second pipe pile is connected to the return grouting pipe in the first pipe pile through a pipe body connecting device.

[0013] Another objective of this invention is to provide a method for manufacturing a pile-side grouting structure, which facilitates the fixing of the pile-side grouting structure to the pipe pile, thereby improving the stability of the pile-side grouting structure in use.

[0014] A method for fabricating a pile-side grouting structure, based on the aforementioned pile-side grouting structure, includes the following steps: A1. Cut and weld the vertical steel bars used for the end plate and the pile body, and reserve a notch for fixing the fasteners and a groove for positioning on the end plate. A2. Carry out the cutting and installation of the stirrups for the pipe pile body; A3. Connect the end plate to the steel reinforcement cage of the pipe pile, connect the fastener to the end plate, and fix the connecting sleeve to the fastener; A4. The grouting pipe is connected to the inner vertical reinforcing bars and / or inner pile body stirrups of the pipe pile through a support device; after connection, the grouting pipe is located outside the inner pile body stirrups of the pipe pile; one end of the grouting pipe is connected to the connecting sleeve. A5. After the grouting pipe is fixed, holes are evenly opened on the grouting pipe to form several overflow holes. Then, the overflow holes are sealed with plugs. A6. After sealing the inlet of the grouting pipe and the overflow hole, erect a pipe pile template for the steel reinforcement cage of the pipe pile with the grouting pipe, then pour cement into the pipe pile template, and ensure that the overflow hole is visible on the outside of the pipe pile body to facilitate grouting in the subsequent pipe pile construction process. A7. After the concrete of the pipe pile is poured, wait for the concrete to cure completely before removing the formwork of the pipe pile. A8. Complete the integrated fabrication of the pile side grouting structure and the pipe pile.

[0015] Another objective of this invention is to provide a grouting method for a pile-side grouting structure, which guides people to uniformly fill the gap between the pipe pile and the surrounding soil to increase the pile-side friction resistance and thus improve the construction quality of the pipe pile.

[0016] A grouting method for a pile-side grouting structure, based on the aforementioned pile-side grouting structure, includes the following steps: B1. Drive several sections of pipe piles into the ground; B2. After the pipe piles are driven into place, connect the grouting pipe inlet at the upper end of the pipe pile to a high-pressure grouting pump. B3. Perform pile side grouting, and use the grouting pressure to push the plug at the overflow hole on the grouting pipe away from the overflow hole, so that the grout overflows through the overflow hole into the gap between the side wall of the pipe pile and the surrounding soil. B4. Grouting shall be stopped only after the preset grouting volume is reached or grout overflows from the outlet of the return grout pipe. Afterward, the grouting pipe shall be rinsed with clean water. B5. After grouting is completed, check the filling of grout between the sidewall of the pipe pile and the surrounding soil after a set time interval. If there are gaps that are not filled properly, grouting can be carried out again using the grouting pipe until the gaps between the sidewall of the pipe pile and the surrounding soil are filled properly.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention discloses a pile-side grouting structure for the drilling and casing pile method. The grouting pipe is spirally arranged from top to bottom within the casing pile, with overflow holes on the grouting pipe facing outwards from the casing pile. During grouting, grout overflows from the overflow holes into the gap between the casing pile and the surrounding soil, filling the gap. This invention solves the problem of uneven grouting on the outside of the casing pile in drilling and casing pile construction by uniformly injecting grout into the gap between the casing pile and the surrounding soil through spiral grouting, thus improving the construction quality of the casing pile.

[0018] This invention discloses a method for fabricating a pile-side grouting structure. The method involves pre-embedding the grouting pipe on the outside of the pipe pile, ensuring that the overflow hole of the grouting pipe is visible on the outside of the pile body, which is beneficial for subsequent pile grouting. This method also facilitates the fixing of the pile-side grouting structure to the pipe pile, improving the stability of the pile-side grouting structure in use.

[0019] This invention discloses a grouting method for a pile-side grouting structure. It uses a spirally arranged grouting pipe to inject grout. The grout flows out from the overflow hole of the grouting pipe and fills the gap between the pipe pile and the surrounding soil, ensuring the uniformity of grout injection on the outside of the pipe pile. This grouting method guides the uniform filling of grout into the gap between the pipe pile and the surrounding soil, thereby improving the pile side friction resistance. Attached Figure Description

[0020] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is an elevation view of the single spiral grouting pipe, end plate, and internal steel reinforcement connection of the pipe pile; Figure 2 It is an elevation diagram of two sections of pipe pile connected together to form a long pipe pile (showing a single spiral grouting pipe). Figure 3 This is a diagram showing the connection relationship between the single spiral grouting pipe, the straight-path return grouting pipe, the end plate, and the internal reinforcement of the pipe pile. Figure 4 This is a schematic elevation view of a single-section pipe pile with a single spiral grouting pipe and a straight-path return grouting pipe; Figure 5This is a diagram showing the connection relationship between the single spiral grouting pipe, the single spiral return grouting pipe, the end plate, and the internal reinforcement of the pipe pile (in this section of the pipe pile, the lower end of the single spiral grouting pipe is not connected to the lower end of the single spiral return grouting pipe). Figure 6 This is an elevation diagram of two sections of pipe piles connected together to form a long pipe pile (the grouting pipe of the upper pipe pile is connected to the grouting pipe of the lower pipe pile, and the return grouting pipe of the upper pipe pile is connected to the return grouting pipe of the lower pipe pile; the lower end of the grouting pipe of the lower pipe pile is connected to the lower end of the return grouting pipe of the lower pipe pile). Figure 7 This is an elevation view of the first and second pipe piles connected to form a long pipe pile; Figure 8 yes Figure 1 A magnified view at point H (showing the connection relationship between the end plate, fastener, connecting sleeve, and one end of the grouting pipe); Figure 9 yes Figure 2 A magnified view of a section at point K (the grouting pipes of adjacent pipe piles are connected by a connecting pipe). Figure 10 It is a schematic diagram of the cross-section of the pipe pile (showing the connection between the internal steel reinforcement and the grouting pipe; showing the concrete protective layer of the pipe pile). Figure 11 This is a simplified schematic diagram showing the connection relationship between the grouting pipe and the inner pile body stirrups. Figure 12 This is a three-dimensional schematic diagram of the fastener; Figure 13 This is a three-dimensional schematic diagram of the connecting sleeve; Figure 14 This is a schematic diagram of the elevation of the connecting pipe; Figure 15 This is a perspective view of one embodiment of the end plate (the positioning groove is not shown). Figure 16 This is a schematic diagram of a pipe pile with an end plate at the end (the spiral grouting pipe is not shown).

[0021] Figure label: 1-Grouting pipe; 11-Overflow hole; 12-Hole plug; 2-Pipe fixing device; 21-End plate; 211-Notch; 22-Fixing component; 23-Connecting sleeve; 3-Return slurry pipe; 4-Connecting pipe; 5-Second grouting pipe; 6-Second grouting pipe; 7-Pipe pile; 71-Concrete cover; E-Outer direction; 72-Inner vertical reinforcement; 73-Outer vertical reinforcement; 74-Inner pile body stirrups; F-First pipe pile; G-Second pipe pile; H-First enlarged view number; K-Second enlarged view number; 8-groove; 9-Support device. Detailed Implementation

[0022] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0023] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0024] Reference Figures 1 to 16 A pile-side grouting structure includes a grouting pipe 1 and a pipe fixing device 2; the grouting pipe 1 is spirally arranged from top to bottom on the outside of the pipe pile 7 (its outer direction, refer to...). Figure 10 (As shown in E in the figure). The grouting pipe 1 is provided with a plurality of overflow holes 11 along its own length direction; the overflow holes 11 are provided with plugs 12; the inlet end of the grouting pipe 1 can be connected to a high-pressure grouting pump; the upper end and / or lower end of the pipe pile 7 are provided with the pipe body fixing device 2; the grouting pipe 1 is connected to the pipe body fixing device 2.

[0025] Reference Figures 1 to 16 In one embodiment, the overflow holes 11 are provided at predetermined intervals along the length of the grouting pipe 1. In this invention, the spacing of the overflow holes 11 can be set according to geological conditions.

[0026] Reference Figures 1 to 16 In one embodiment, the grouting pipe 1 is disposed within the concrete protective layer 71 of the pipe pile 7, and the overflow hole 11 is disposed facing the outer side of the pile body of the pipe pile 7 (wherein, the outer side direction refers to...). Figure 10As shown in Figure E), the overflow hole 11 is visible outside the pile body and is used for grouting to fill the gap between the pipe pile and the surrounding soil. The concrete layer between the inner vertical reinforcement 72 and the outer vertical reinforcement 73 of the pipe pile 7 is the concrete protective layer 71 of the pipe pile 7. This concrete protective layer 71 is a new design of this invention, which can improve the bearing capacity of the pipe pile 7 and can also be used to embed the grouting pipe and / or return grouting pipe, protecting the grouting pipe and / or return grouting pipe and improving the stability of the pile-side grouting structure on the pipe pile 7. Several inner vertical reinforcements 72 of the pipe pile 7 are connected by inner pile body stirrups 74, which are spirally arranged from top to bottom on the inner vertical reinforcement 72. The outer vertical reinforcement 73 of the pipe pile 7 facilitates the binding and fixing of the grouting pipe 1 during the initial construction of the structure.

[0027] Preferably, the outer vertical reinforcing bars 73 of the pipe pile 7 are further provided with outer pile body stirrups; the outer pile body stirrups are spirally arranged on the outer vertical reinforcing bars 73 from top to bottom.

[0028] In one embodiment, compared with conventional pipe pile structures, the presence of the concrete protective layer 71 of the pipe pile 7 in this invention increases the cross-section of the pipe pile 7, which is beneficial to improving the bearing capacity of the pipe pile 7.

[0029] In one embodiment, a pile-side grouting structure further includes a concrete protective layer 71 for the pipe pile 7.

[0030] Reference Figures 1 to 16 In one embodiment, the pipe pile 7 is provided with the pipe body fixing device 2 at both the upper and lower ends; The pipe fixing device 2 includes an end plate 21, a fixing member 22 and a connecting sleeve 23; The end plate 21 is connected to the internal reinforcing bars of the pipe pile 7 (such as the inner vertical reinforcing bars 72 and the outer vertical reinforcing bars 73). After the end plate 21 is installed, it is located at the end of the pipe pile 7. The fixing member 22 is connected to the end plate 21; the connecting sleeve 23 is disposed on the fixing member 22; one end of the grouting pipe 1 is connected to the connecting sleeve 23 (preferably, one end of the grouting pipe 1 is threadedly connected to the connecting sleeve 23, and after connection, the inner hole of the connecting sleeve corresponds to the inner hole of the grouting pipe).

[0031] Reference Figures 1 to 16In one embodiment, the end plate 21 is a steel end plate, which is welded to the internal reinforcing bars of the pipe pile 7; the fixing member 22 is an angle iron; the end plate 21 has a notch 211 for welding and fixing to the angle iron; the connecting sleeve 23 is a steel connecting sleeve; the connecting sleeve 23 is welded and fixed to the angle iron, and the connecting sleeve 23 is used to communicate with one end of the grouting pipe 1 embedded in the concrete protective layer 71 of the pipe pile 7.

[0032] Reference Figures 3 to 7 In one embodiment, a pile-side grouting structure further includes a return grout pipe 3; the return grout pipe 3 is disposed in the pipe pile 7 (preferably, disposed in the concrete protective layer 71 of the pipe pile 7); the lower end of the return grout pipe 3 is connected to the lower end of the grouting pipe 1 (see reference). Figure 6 (Lower pipe piles) or not connected (refer to) Figure 5 The upper end of the grout return pipe 3 is connected to the top of the pipe pile 7. The grout return pipe 7 does not have an overflow hole, while the grout injection pipe 1 is equipped with an overflow hole 11.

[0033] Reference Figures 1 to 16 In one embodiment, a pile-side grouting structure further includes a support device 9, through which the grouting pipe 1 and / or the return grout pipe 3 are connected to the internal reinforcing steel of the pipe pile 7. The support device 9 facilitates the fixation of the grouting pipe 1 and / or the return grout pipe 3 during the initial fabrication of the structure. The support device 9 can be one or more of angle iron, channel steel, connecting plate, and reinforcing steel; however, the support device 9 is not limited to the angle iron, channel steel, connecting plate, and reinforcing steel mentioned in this invention, as long as the structure can fix the grouting pipe 1 and / or the return grout pipe 3 to the internal reinforcing steel of the pipe pile.

[0034] In one embodiment, refer to Figure 3 and Figure 4 The grout return pipe 3 is installed in a straight line from top to bottom in the pipe pile 7; refer to Figure 5 Alternatively, the grout return pipe 3 may be spirally arranged from top to bottom in the pipe pile 7.

[0035] Reference Figure 2 , Figure 6 , Figure 7 , Figure 9 , Figure 12 , Figure 13 , Figure 14 and Figure 15In one embodiment, a pile-side grouting structure further includes a pipe body connecting device; several sections of pipe piles 7 are connected to form a long pipe pile of a predetermined length, and the grouting pipes 1 on adjacent pipe piles are connected through the pipe body connecting device. Preferably, the pipe body connecting device is a short-length connecting pipe 4. After two adjacent pipe pile sections are joined, the connecting pipe 4 can connect the grouting pipes 1 of the upper and lower pipe pile sections. Specifically, the connecting pipe 4 is placed on the fixing member 22 (such as placed in the L-shaped right-angle recess of the angle iron), and both ends of the connecting pipe 4 are respectively connected to the connecting sleeve 23 on the adjacent pipe pile, thereby connecting the grouting pipes 1 of the adjacent pipe pile sections. Preferably, the connecting pipe 4 is a steel connecting pipe, and the connecting pipe 4 is welded together with the connecting sleeve 23. After welding and fixing, the inner hole of the connecting sleeve 23 corresponds to the inner hole of the connecting pipe 4.

[0036] Reference Figure 2 , Figure 6 , Figure 7 , Figure 9 , Figure 12 , Figure 13 , Figure 14 and Figure 15 In one embodiment, a pile-side grouting structure further includes a grout return pipe 3; the grout return pipe 3 is disposed in the pipe pile 7; A pile-side grouting structure further includes a pipe body connecting device; several sections of pipe piles 7 are connected to form a long pipe pile of a predetermined length, and the grout return pipes 3 on adjacent pipe piles are connected through the pipe body connecting device. Preferably, the pipe body connecting device is a short-length connecting pipe 4, which can connect the grout return pipes 3 of the upper and lower pipe piles after the two adjacent sections of pipe piles 7 are connected.

[0037] In one embodiment, the fixing member 22 is an angle iron; another notch 211 is also provided at another position of the end plate 21; the angle iron is provided at the notch 211; the connecting sleeve 23 is provided on the angle iron (e.g., at the L-shaped right-angle recess of the angle iron); one end of the grout return pipe 3 is connected to the connecting sleeve 23; when two adjacent pipe piles 7 are assembled together, the two ends of the connecting pipe 4 respectively connect the connecting sleeves 23 on the adjacent pipe piles, thereby connecting the grout return pipes 3 of the two adjacent pipe piles.

[0038] Reference Figure 7 In one embodiment, the grouting pipe 1 is spirally arranged in the first pipe pile F; the return grout pipe 3 is straight or spirally arranged in the first pipe pile F; in the first pipe pile F, the lower end of the grouting pipe 1 and the lower end of the return grout pipe 3 are connected. A pile-side grouting structure further includes a second grouting pipe 5 and a second return grouting pipe 6; the second grouting pipe 5 is straight-lined in the second pipe pile G; the second return grouting pipe 6 is straight-lined in the second pipe pile G; At least one section of the second pipe pile G is connected to the first pipe pile F to form a long pipe pile. The second grouting pipe 5 in the second pipe pile G is connected to the grouting pipe 1 in the first pipe pile F through a pipe body connecting device (such as a connecting pipe 4). The second grout return pipe 6 in the second pipe pile G is connected to the grout return pipe 3 in the first pipe pile F through a pipe body connecting device (such as a connecting pipe 4).

[0039] For different geological conditions, this invention designs different pile-side grouting structures for grouting construction, referring to... Figure 1 In the first embodiment, a single spiral grouting pipe 1 is provided on a pipe pile, but no return grouting pipe is provided. This pile-side grouting structure is suitable for use in cohesive soil strata. The single spiral grouting pipe 1 on the pipe pile 7 is not connected to the return grouting pipe; therefore, no return grouting occurs after pile-side grouting. (Refer to...) Figure 2 and Figure 9 It can be assembled from multiple sections of pipe pile 7 into a long pipe pile, and the grouting pipes 1 of adjacent pipe piles are connected by connecting pipes 4.

[0040] Reference Figure 3 and Figure 4 In the second embodiment, a single spiral grouting pipe 1 and a straight-path return grouting pipe 3 are provided on a pipe pile 7. This pile side grouting structure is suitable for use in water-rich and under-consolidated rock-filled strata. Since the single spiral grouting pipe 1 on the pipe pile 7 is connected to the straight-path return grouting pipe 3, it can return grout after the pile side grouting.

[0041] Reference Figure 5 In the third embodiment, a single spiral grouting pipe 1 and a single spiral return grouting pipe 3 are provided on a pipe pile. The single spiral grouting pipe 1 and the single spiral return grouting pipe 3 form a double spiral pipeline system. In this section of the pipe pile, the lower end of the single spiral grouting pipe 1 and the lower end of the single spiral return grouting pipe 3 are not connected. This pile-side grouting structure is suitable for use in water-rich, underconsolidated rock-filled strata. (Refer to...) Figure 5 and Figure 6 This pipe pile can be used to assemble with other pipe piles.

[0042] Reference Figure 6 In the fourth embodiment of the pipe pile, a single spiral grouting pipe 1 and a single spiral grout return pipe 3 are provided on one pipe pile. The single spiral grouting pipe 1 and the single spiral grout return pipe 3 form a double spiral pipeline system. In this section of the pipe pile, the lower end of the single bolt grouting pipe 1 is connected to the lower end of the single spiral grout return pipe 3. This pile-side grouting structure is suitable for use in water-rich, under-consolidated rock-filled strata. This pipe pile (refer to...) Figure 6 The lower pipe piles), can be assembled with the pipe piles of the third embodiment to form long pipe piles (such as... Figure 6 After assembly, the grouting pipe 1 of the upper pipe pile is connected to the grouting pipe 1 of the lower pipe pile via the connecting pipe 4, and the grout return pipe 3 of the upper pipe pile is connected to the grout return pipe 3 of the lower pipe pile via the connecting pipe 4. In this embodiment of the long pipe pile, the pipe pile used is from the third embodiment (refer to...). Figure 6 The number of pipe piles can be several, and several sections of pipe piles in the third embodiment are sequentially assembled into the pipe piles of the fourth embodiment (refer to...). Figure 6 On the lower pipe pile, between adjacent pipe piles, the grouting pipes are connected to each other, and the return grouting pipes are connected to each other.

[0043] Reference Figure 7 In the fifth embodiment, the "first pipe pile F" is provided with a single spiral grouting pipe 1 and a single spiral grout return pipe 3. The single spiral grouting pipe 1 and the single spiral grout return pipe 3 form a double spiral pipeline system. In this section of the pipe pile, the lower end of the single bolt grouting pipe 1 is connected to the lower end of the single spiral grout return pipe 3. On the "second pipe pile G", there is a straight-path second grouting pipe 5 and a straight-path second return grouting pipe 6. In this section of pipe pile, the straight-path second grouting pipe 5 and the straight-path second return grouting pipe 6 are not connected. When the "second pipe pile G" is spliced ​​together with the "first pipe pile F" mentioned in the fifth embodiment, the second grouting pipe 5 of the upper pipe pile is connected to the grouting pipe 1 of the lower pipe pile through the connecting pipe 4, and the second return grouting pipe 6 of the upper pipe pile is connected to the return grouting pipe 3 of the lower pipe pile through the connecting pipe 4. There can be multiple "second pipe piles G", which are arranged sequentially on the "first pipe pile F", ensuring that the grouting pipe of the upper pipe pile is connected to the grouting pipe of the lower pipe pile, and the return grouting pipe of the upper pipe pile is connected to the return grouting pipe of the lower pipe pile.

[0044] In one embodiment, if grouting is only required at a fixed depth, the "upper pipe pile" can be a straight pipe grouting and grout discharge pipe pile.

[0045] In one embodiment, the grouting pipe 1 is a grouting pipe made of plastic; the grout return pipe 3 is a grout return pipe made of plastic.

[0046] In one embodiment, adjacent pipe piles are welded together by end plates 21 at their ends; for example, the lower end plate 21 of the upper pipe pile is welded to the upper end plate 21 of the lower pipe pile. Preferably, when adjacent pipe piles 7 are assembled, they are aligned together by a positioning device. Preferably, the positioning device is a groove 8 formed on the end plate 21. Preferably, after the adjacent pipe piles 7 are assembled, the groove 8 is sealed. It should be noted that the positioning device mentioned in this invention is not limited to a groove.

[0047] Previously, in drilling and casing pile construction, uneven grouting on the outside of the pipe pile was common, leading to deformation and damage of the grouting pipes and potential safety and quality issues. This invention presents a pile-side grouting structure with a spirally embedded grouting pipe and evenly distributed overflow holes, solving the problem of uneven grouting on the outside of the pipe pile in drilling and casing pile construction, thus improving the construction quality and safety of the pipe pile. This pile-side grouting structure, through a spiral grouting system, evenly injects grout into the gap between the pipe pile and the surrounding soil, increasing the pile's frictional resistance and consequently its bearing capacity. Based on the spiral grouting system, this invention also incorporates different grouting-returning structures designed for different geological conditions, improving the stability of the pipe pile during construction and reducing maintenance costs. This pile-side grouting structure improves the construction quality after drilling and casing pile driving.

[0048] Another objective of this invention is to provide a method for manufacturing a pile-side grouting structure, which facilitates the fixing of the pile-side grouting structure to the pipe pile, thereby improving the stability of the pile-side grouting structure in use.

[0049] Reference Figures 1 to 16 A method for fabricating a pile-side grouting structure, based on the aforementioned pile-side grouting structure, includes the following steps: A1. Cut and weld the vertical steel bars (such as inner vertical steel bars 72 and outer vertical steel bars 73) used for the end plate 21 and the pile body. Make a notch 211 (such as an L-shaped notch) for the installation of the fixing parts 22 and a groove 8 for positioning on the end plate 21. A2. Carry out the cutting and installation of the stirrups (such as the inner stirrups) for the pipe pile 7; A3. Connect the end plate 21 to the steel reinforcement cage of the pipe pile, connect the fastener 22 to the end plate 21, and fix the connecting sleeve 23 to the fastener 22; preferably, the fastener 22 is an angle iron, and the connecting sleeve 23 is a steel connecting sleeve. Specifically, the angle iron is welded and fixed to the notch 211 of the end plate 21, and the steel connecting sleeve 23 is welded and fixed to the L-shaped right-angle recess of the angle iron. A4. The grouting pipe 1 is connected to the inner vertical reinforcing bars 72 and / or the inner pile body stirrups 74 of the pipe pile 7 via the support device 9; after connection, the grouting pipe 1 is located outside the inner pile body stirrups 74 of the pipe pile 7 (where outside refers to...). Figure 10 (as shown in E in the figure); one end of the grouting pipe 1 is connected to the connecting sleeve 23; wherein, the supporting device 9 is used for connecting the grouting pipe 1 to the internal steel reinforcement of the pipe pile 7 or for connecting the return grout pipe 3 to the internal steel reinforcement of the pipe pile 7; A5. After the grouting pipe 1 is fixed, holes are evenly opened on the grouting pipe 1 to form a number of overflow holes 11. Then, the overflow holes 11 are sealed with the hole plugs 12. A6. After sealing the inlet, outlet, and overflow hole 11 of the grouting pipe 1, erect a pipe pile template for the steel reinforcement cage of the pipe pile with the grouting pipe 1. Then, pour cement into the pipe pile template and ensure that the overflow hole 11 is visible on the outside of the pipe pile 7 to facilitate grouting during the subsequent construction of the pipe pile 7. Also, ensure that the fixing part 22 (such as the L-shaped right-angle recess of the angle iron) can be used for the subsequent arrangement of the connecting pipe 4. A7. After the concrete of the pipe pile is poured, wait for the concrete to cure completely before removing the formwork of the pipe pile. A8. Complete the integrated fabrication of the pile side grouting structure and the pipe pile.

[0050] Another objective of this invention is to provide a grouting method for a pile-side grouting structure, which guides people to uniformly fill the gap between the pipe pile and the surrounding soil to increase the pile-side friction resistance and thus improve the construction quality of the pipe pile.

[0051] Reference Figures 1 to 16 A grouting method for a pile-side grouting structure, which is based on the aforementioned pile-side grouting structure, includes the following steps: B1. Drive several sections of pipe pile 7 into the ground; B2. After the pipe pile 7 is driven into the ground, connect the inlet of the grouting pipe 1 at the upper end of the pipe pile 7 to the high-pressure grouting pump. B3. Perform pile side grouting. Use the grouting pressure to push the plug 12 at the overflow hole 11 on the grouting pipe 1 away from the overflow hole 11, so that the grout overflows through the overflow hole 11 into the gap between the side wall of the pipe pile and the soil around the pile. B4. Grouting shall be stopped only after the grouting reaches the preset grouting volume or grout overflows from the outlet of the return pipe 3. Afterward, the grouting pipe 1 shall be rinsed with clean water to help prevent the grouting pipe 1 from becoming blocked in subsequent use. B5. After grouting is completed, check the filling of grout between the side wall of the pipe pile and the surrounding soil after a set time interval. If there are gaps that are not filled properly, grouting can be carried out again using the grouting pipe 1 until the gaps between the side wall of the pipe pile and the surrounding soil are filled properly.

[0052] Reference Figure 4 In one embodiment, if the pipe pile 7 has only one section in step B1, then it includes the following steps: C1. Vertically lift the pipe pile 7 and the auger drill rod, and then carry out the drilling, soil removal and pile driving work for the pipe pile 7; C2. Complete the driving of one section of pipe pile 7.

[0053] Reference Figure 2 or Figure 6 or Figure 7 In another embodiment, if the pipe pile 7 has multiple sections in step B1, then it includes the following steps: D1. Vertically lift pipe pile 7 and spiral drill rod, then carry out drilling, soil removal and pile driving work for pipe pile 7. Drive pipe pile 7 to a height of 1.2m above the ground elevation, then stop drilling and carry out the splicing work for pipe pile 7. D2. During the pile splicing process, the groove 8 at the lower end of the upper pipe pile is aligned with the groove 8 at the upper end of the lower pipe pile. After the two pipe piles are aligned, the end plates 21 between adjacent pipe piles are connected. After welding, the end plates 21 are allowed to cool. Then, the grouting pipe 1 of the upper pipe pile is connected to the grouting pipe 1 of the lower pipe pile through the connecting pipe 4. Preferably, the grout return pipe 3 of the upper pipe pile is also connected to the grout return pipe 3 of the lower pipe pile through the connecting pipe 4. Preferably, after the connecting pipe 4 is arranged in the L-shaped right-angle recess of the fixing member 22, the L-shaped right-angle recess can be sealed. D3. After the pile splicing work is completed, proceed with the soil removal and pile driving work for the next pipe pile 7. D4. Repeat steps D1 to D3 until the multi-section pipe pile 7 is driven into the pile.

[0054] For cohesive soil strata with high strength, cement grout is used for grouting with a water-cement ratio of 0.8 to 1.2. Two grouting processes are employed, with the second grouting performed after the first grout has completed its initial setting (generally 2 hours). The grouting pressure is 1.0 MPa to 2.0 MPa. An overflow hole 11 is provided every 80 cm along the length of the grouting pipe 1.

[0055] For water-rich, underconsolidated rock-filled strata, grouting mainly employs a two-component grout. The water glass modulus is 2–3.5, and the concentration is 37be–44be. Ordinary Portland cement of grade PO 42.5 is used, with a water-cement ratio of 0.5–0.8. Water glass and water are mixed at a 1:3 ratio, and the water glass mixture is then mixed with the cement grout at a 1:1 ratio to create a two-component grout. The setting time of the grout is controlled to be 120–150 seconds, and the grouting pressure is 2.0 MPa–3.0 MPa. Multiple grouting sessions are employed, following the principle of starting with a thinner solution and gradually increasing the concentration, with intervals controlled within 2 hours. An overflow hole 11 is installed every 50 cm along the length of the grouting pipe 1.

[0056] Preferably, after the gap between the sidewall of the pipe pile and the surrounding soil is completely filled with grout, the grout flow pipeline in the pipe pile 7 can be filled with grouting material to make it dense; wherein, the grout flow pipeline in the pipe pile 7 includes the grouting pipe 1, the connecting sleeve 23, the connecting pipe 4, and the grout return pipe 3.

[0057] Other aspects of the pile-side grouting structure, manufacturing method, and grouting method described in this invention are found in the prior art and will not be repeated here.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pile side grouting structure, characterized by, The invention relates to a pile side grouting structure, comprising a grouting pipe and a pipe body fixing device; the grouting pipe is spirally arranged outside the pipe pile; the grouting pipe is provided with a plurality of overflow holes along the length direction of the grouting pipe; the inlet end of the grouting pipe is connected with a high-pressure grouting pump; the upper end and / or the lower end of the pipe pile is provided with the pipe body fixing device; the grouting pipe is connected with the pipe body fixing device.

2. The pile side grouting structure according to claim 1, characterized in that, The grouting pipe is arranged in the concrete protective layer of the pipe pile, and the overflow holes are arranged to face the outside of the pile body of the pipe pile, and the overflow holes are used to fill the gap between the pipe pile and the soil around the pile.

3. The pile side grouting structure according to claim 1, characterized in that, The upper end and the lower end of the pipe pile are respectively provided with the pipe body fixing device; The pipe body fixing device comprises an end plate, a fixing member and a connecting sleeve pipe; The end plate is connected with the internal reinforcement of the pipe pile, and the end plate is arranged at the end of the pipe pile after being arranged; The fixing member is connected with the end plate; the connecting sleeve pipe is arranged on the fixing member; one end of the grouting pipe is communicated with the connecting sleeve pipe.

4. The pile side grouting structure according to claim 1, characterized in that, Further comprising a back grouting pipe; the back grouting pipe is arranged in the pipe pile; the lower end of the back grouting pipe is communicated with or not communicated with the lower end of the grouting pipe; the upper end of the back grouting pipe is communicated with the top of the pipe pile.

5. A pile side grouting structure according to claim 4, characterized in that, The back grouting pipe is straightly arranged in the pipe pile, or the back grouting pipe is spirally arranged in the pipe pile.

6. A pile side grouting structure according to any one of claims 1 to 5, characterized in that, Further comprising a pipe body connecting device; a plurality of pipe piles are connected into a long pipe pile with a set length, and the grouting pipes on adjacent pipe piles are communicated through the pipe body connecting device.

7. The pile side grouting structure according to claim 1, characterized by, Further comprising a back grouting pipe; the back grouting pipe is arranged in the pipe pile; Further comprising a pipe body connecting device; a plurality of pipe piles are connected into a long pipe pile with a set length, and the back grouting pipes on adjacent pipe piles are communicated through the pipe body connecting device.

8. The pile side grouting structure according to claim 4, wherein The grouting pipe is spirally arranged in the first pipe pile; the back grouting pipe is straightly or spirally arranged in the first pipe pile; in the first pipe pile, the lower end of the grouting pipe and the lower end of the back grouting pipe are communicated; Further comprising a second grouting pipe and a second back grouting pipe; the second grouting pipe is straightly arranged in the second pipe pile; the second back grouting pipe is straightly arranged in the second pipe pile; At least one second pipe pile is connected with the first pipe pile to form a long pipe pile, the second grouting pipe in the second pipe pile is communicated with the grouting pipe in the first pipe pile through the pipe body connecting device, and the second back grouting pipe in the second pipe pile is communicated with the back grouting pipe in the first pipe pile through the pipe body connecting device.

9. A method for manufacturing a pile side grouting structure based on the pile side grouting structure according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: A1, cutting and welding the vertical reinforcement for the end plate and the pile body of the pipe pile, reserving a notch for the fixing member on the end plate, and reserving a recess for positioning; A2, carrying out the blanking and installation of the hoop of the pile body of the pipe pile; A3, connecting the end plate and the reinforcement framework of the pipe pile together, connecting the fixing member to the end plate, and fixing the connecting sleeve pipe on the fixing member; A4, the grouting pipe is connected with the internal vertical reinforcement and / or the internal pile body hoop of the pipe pile through a supporting device; after being connected, the grouting pipe is outside the internal pile body hoop of the pipe pile; one end of the grouting pipe is connected with the connecting sleeve pipe; A5, after the grouting pipe is fixed, uniformly opening holes on the grouting pipe to form a plurality of overflow holes, then the overflow holes are plugged with hole plugs; A6, after the grouting pipe inlet and the overflow holes are completely sealed, a pipe pile formwork is erected on the pipe pile reinforcement with the grouting pipe, then cement is poured into the pipe pile formwork, and the overflow holes are ensured to be exposed on the outside of the pipe pile body, so as to facilitate subsequent grouting in the pipe pile construction process; A7, after pouring is completed, the pipe pile formwork is removed after the pipe pile concrete is cured; A8, the integration of the pile side grouting structure and the pipe pile is completed.

10. A method of grouting a pile side grouting structure according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: B1, a plurality of pipe piles are sunk into the ground; B2, after the pipe piles are sunk, the grouting pipe inlet at the upper end of the pipe pile is connected to a high-pressure grouting pump; B3, pile side grouting is performed, the hole plugs at the overflow holes on the grouting pipe are pressed away from the overflow holes by the grouting pressure, and the slurry is overflowed through the overflow holes to the gap between the pipe pile side wall and the soil body around the pile; B4, until the grouting reaches a preset grouting amount or the slurry is overflowed from the return pipe outlet, the grouting is stopped, then the grouting pipe is washed with clean water; B5, after grouting is completed, a certain time interval is set, then the filling condition of the slurry between the pipe pile side wall and the soil body around the pile is checked, if there is a gap that is not filled well, the grouting pipe can be used for grouting again until the gap between the pipe pile side wall and the soil body around the pile is filled well.

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