PHC pipe pile

Abstract

The utility model provides a kind of PHC pipe pile, including pile body, grouting cavity is pre-installed in pile body, grouting cavity is annular cavity and extends along the axial direction of pile body;The upper side of grouting cavity is communicated with grouting channel, and grouting channel is used to connect grouting pump;The lower side of grouting cavity is communicated with slurry discharge channel, and slurry discharge channel has multiple and is interval arranged along the circumferential direction of pile body, and slurry discharge port of slurry discharge channel passes through the outer wall surface of pile body.The utility model provides a kind of PHC pipe pile, provides lubrication for sinking pile in the process of sinking pile, reduces sinking difficulty, improves construction speed, reduces even avoids PHC pipe pile breakage;After sinking pile is completed, slurry is used as the adhesive between pile body and soil layer, improves the frictional resistance between pile body and soil layer, enhances the vertical bearing capacity of pile body.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to a PHC pipe pile. Background Technology

[0002] In the field of building construction, the use of prestressed high-strength concrete pipe piles (PHC pipe piles) can effectively reduce the settlement of the superstructure and significantly improve the ultimate bearing capacity of the foundation. PHC pipe piles are typically driven using a hammer-driven method. During the driving process, due to the frictional resistance between the outer wall of the pipe pile and the soil layer, the larger the diameter of the PHC pipe pile and the deeper it penetrates, the more proportionally the difficulty of pile driving increases, and the construction speed decreases significantly. To address the difficulty of pile driving, existing technologies for hammer-driven piles typically increase the hammer weight, resulting in a large vertical impact load on the PHC pipe pile, thereby increasing the risk of PHC pipe pile damage. Utility Model Content

[0003] This utility model provides a PHC pipe pile to solve the technical problem in the prior art where increasing the hammer weight for hammering results in a large vertical impact load on the PHC pipe pile, thereby increasing the risk of damage to the PHC pipe pile.

[0004] This utility model provides a PHC pipe pile, including a pile body, in which a grouting cavity is pre-installed. The grouting cavity is annular and extends along the axial direction of the pile body. The upper side of the grouting cavity is connected to a grouting channel for connecting a grouting pump. The lower side of the grouting cavity is connected to a grout discharge channel. Multiple grout discharge channels are spaced apart along the circumferential direction of the pile body, and the grout discharge port of the grout discharge channel passes through the outer wall surface of the pile body.

[0005] Optionally, the slurry discharge channel has a bent structure, and the slurry discharge channel includes a first channel and a second channel that are connected to each other. The first channel is connected to the grouting cavity, and the slurry discharge port is located in the second channel. The second channel is inclined upward. And / or, the discharge port is provided with a sealing element.

[0006] Optionally, the grouting channel is connected to the side wall of the grouting cavity, and the grouting port of the grouting channel passes through the outer wall of the pile body; Alternatively, the grouting channel is connected to the upper wall of the grouting cavity.

[0007] Optionally, a pressure gauge is provided at the grouting channel and the grouting pump outlet, and the pressure gauge is used to monitor the grouting pressure; And / or, the grouting channel and the grouting pump outlet are equipped with flow meters, which are used to monitor the grouting flow rate.

[0008] Optionally, the PHC pipe pile also includes an alarm, which is electrically connected to the pressure gauge and is used to issue an alarm signal when the grouting pressure monitored by the pressure gauge exceeds a preset pressure.

[0009] Optionally, a first end plate is fixedly provided at the upper end of the pile body, and a second end plate is fixedly provided at the lower end of the pile body.

[0010] Optionally, the distance between the upper wall of the annular cavity and the upper surface of the first end plate is between 150-250 mm; And / or, the distance between the discharge port and the lower surface of the second end plate is between 150-250 mm.

[0011] Optionally, a pile tip is fixed at the lower end of the pile body.

[0012] Optionally, the pile tip is a cross-shaped pile tip.

[0013] Optionally, the pile body has an inner wall surface and an outer wall surface, and a reinforcing cage is provided between the inner wall surface and the outer wall surface of the pile body; the grouting cavity is located between the reinforcing cage and the inner wall surface of the pile body, or the grouting cavity is located between the reinforcing cage and the outer wall surface of the pile body; And / or, the annular cavity is a circular cavity, and the annular width of the circular cavity is between 25-40 mm; And / or, the diameter of the slurry discharge channel is between 25-40 mm; And / or, the diameter of the grouting channel is between 25-40 mm.

[0014] The PHC pipe pile provided by this utility model has at least the following beneficial technical effects: By pre-installing a grouting cavity within the pile body, and connecting the grouting cavity to one grouting channel and multiple grouting discharge channels—a single-injection, multi-discharge design—the following advantages are achieved: First, setting up a single grouting cavity reduces the number of grouting pipes within the pile body, lowering the complexity of the grouting pipe layout and thus shortening the construction cycle. Second, setting up a single grouting channel requires only one grouting pump, reducing the number of connecting parts between the grouting channel and the pump, thereby saving costs, simplifying installation steps, and reducing the labor intensity of workers. Furthermore, setting up multiple grouting discharge channels ensures that the grout evenly fills the area around the pipe pile, avoiding uneven grout coverage. During pile driving, the grout provides lubrication, reducing the difficulty of pile driving, increasing construction speed, and reducing or even preventing damage to PHC pipe piles. Finally, after pile driving, the grout acts as an adhesive between the pile body and the soil layer, increasing the frictional resistance between the pile body and the soil layer, and enhancing the vertical bearing capacity of the pile body. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a PHC pipe pile provided for an embodiment of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of BB.

[0016] Explanation of reference numerals in the attached figures: 100. Pile body; 110. Pile tip; 120. Grouting cavity; 121. Grouting channel; 123. Grouting discharge channel; 125. Sealing component; 130. First end plate; 140. Second end plate. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-3 Specific embodiments of this utility model will be described in detail.

[0018] In this utility model, the terms "connection" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure.

[0019] In this utility model, the terms "inner", "outer", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] This utility model embodiment provides a PHC pipe pile, see appendix. Figures 1-3 The PHC pipe pile includes a pile body 100, within which a grouting cavity 120 is pre-installed. The grouting cavity 120 is an annular cavity extending along the axial direction of the pile body 100. A grouting channel 121 is connected to the upper side of the grouting cavity 120, which is used to connect to a grouting pump. A grout discharge channel 123 is connected to the lower side of the grouting cavity 120. Multiple grout discharge channels 123 are spaced apart along the circumferential direction of the pile body 100, and the discharge ports of the grout discharge channels 123 pass through the outer wall of the pile body 100. It should be noted that the grout pump delivers a 1:3 retarded cement mortar, i.e., the mass ratio of cement to sand is 1:3.

[0021] This utility model provides a PHC pipe pile, which adopts a single-injection, multi-drainage design by pre-installing a grouting cavity 120 within the pile body 100, and the grouting cavity 120 connecting a grouting channel 121 and multiple grouting discharge channels 123. On the one hand, setting up a single grouting cavity 120 reduces the number of grouting pipelines within the pile body 100, lowering the complexity of the grouting pipeline layout within the pile body 100, thereby shortening the construction period. On the other hand, setting up a single grouting channel 121 requires only one grouting pump, reducing the number of grouting channels 121 and grouting pumps required. The reduced use of connecting parts saves costs, simplifies installation steps, and reduces the labor intensity of workers. In addition, setting multiple grout discharge channels 123 allows the grout to fill the area around the pipe pile evenly, avoiding uneven grout coverage. During the pile driving process, it provides lubrication, reduces the difficulty of pile driving, increases construction speed, and reduces or even avoids damage to PHC pipe piles. After pile driving is completed, the grout acts as an adhesive between the pile body 100 and the soil layer, increasing the frictional resistance between the pile body 100 and the soil layer and enhancing the vertical bearing capacity of the pile body 100.

[0022] In this embodiment of the invention, the grout discharge channels 123 can be 2, 3, 4, or other quantities. Preferably, there are 4 grout discharge channels 123, which are equally spaced along the circumferential direction of the pile body 100.

[0023] In this embodiment of the utility model, see appendix. Figure 3 The grout discharge channel 123 has a bent structure and includes a first channel and a second channel that are interconnected. The first channel is connected to the grouting chamber 120, and the grout discharge port is located in the second channel, which is inclined upwards. It should be noted that the grout discharge channel 123 and the grouting chamber 120 form a U-shaped structure. With this design, as the pipe pile is driven into the soil, the upward inclination of the grout discharge port can prevent clogging.

[0024] In this embodiment of the utility model, see appendix. Figure 3 The grout discharge port is equipped with a sealing element 125. This setting prevents water or soil from entering the grout discharge channel 123 and blocking it during the pile driving process. After the pile driving is completed, when grouting begins, the sealing element 125 will be opened under the grouting pressure, and the grout can be discharged along the grout discharge channel 123.

[0025] In this embodiment of the invention, the grouting channel 121 can be arranged in various positions, as follows: For example, see Appendix Figure 1 and Figure 2 The grouting channel 121 is connected to the side wall of the grouting cavity 120, and the grouting port of the grouting channel 121 passes through the outer wall of the pile body 100. For example, the grouting channel 121 is connected to the upper wall of the grouting cavity 120.

[0026] In this embodiment of the invention, pressure gauges are provided at the grouting channel 121 and the grouting pump outlet, and the pressure gauges are used to monitor the grouting pressure.

[0027] In this embodiment of the utility model, a flow meter is provided at the grouting channel 121 and the grouting pump outlet end, and the flow meter is used to monitor the grouting flow rate.

[0028] In this embodiment of the utility model, the PHC pipe pile also includes an alarm device, which is electrically connected to a pressure gauge. The alarm device is used to issue an alarm signal when the grouting pressure monitored by the pressure gauge exceeds the preset pressure.

[0029] In this embodiment of the utility model, see appendix. Figure 3 A first end plate 130 is fixed to the upper end of the pile body 100, and a second end plate 140 is fixed to the lower end of the pile body 100. It should be noted that the first end plate 130 is a steel plate, which is welded to the upper end of the pile body 100 to form a sealed connection; the second end plate 140 is a steel plate, which is welded to the lower end of the pile body 100 to form a sealed connection. This arrangement ensures that the first end plate matches the upper end of the pile body 100, sealing the upper end of the pile body 100 and protecting the pipe pile from damage when it is hammered into the soil vertically; the second end plate 140 matches the lower end of the pile body 100, sealing the lower end of the pile body 100 to ensure a watertight seal inside and outside the pile during pile driving and grouting, preventing cement slurry, water, soil, etc., from entering the pipe pile during grouting.

[0030] In this embodiment of the invention, the distance between the upper wall of the annular cavity and the upper surface of the first end plate 130 is between 150-250 mm. Preferably, the distance between the upper wall of the annular cavity and the upper surface of the first end plate 130 is 200 mm.

[0031] In this embodiment of the invention, the distance between the slurry discharge port and the lower surface of the second end plate 140 is between 150-250 mm. Preferably, the distance between the slurry discharge port and the lower surface of the second end plate 140 is 200 mm.

[0032] In this embodiment of the utility model, see appendix. Figure 3 The lower end of the pile body 100 is fixed with a pile tip 110.

[0033] In this embodiment of the utility model, see appendix. Figure 3 The pile tip 110 is a cross-shaped pile tip 110.

[0034] In this embodiment of the utility model, the pile body 100 has an inner wall surface and an outer wall surface, and a reinforcing cage is provided between the inner wall surface and the outer wall surface of the pile body 100; the location of the grouting cavity 120 can be various, as follows: For example, the grouting cavity 120 is located between the reinforcing cage and the inner wall of the pile body 100; or, for another example, the grouting cavity 120 is located between the reinforcing cage and the outer wall of the pile body 100.

[0035] In this embodiment of the invention, the annular cavity is a circular cavity with a width between 25-40 mm. Preferably, the width of the circular cavity is 30 mm.

[0036] In this embodiment of the invention, the diameter of the slurry discharge channel 123 is between 25-40 mm. Preferably, the diameter of the slurry discharge channel 123 is 30 mm.

[0037] In this embodiment of the invention, the diameter of the grouting channel 121 is between 25-40 mm. Preferably, the diameter of the grouting channel 121 is 30 mm.

[0038] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A PHC pipe pile, characterized in that, The system includes a pile body (100), in which a grouting cavity (120) is pre-installed. The grouting cavity (120) is an annular cavity and extends along the axial direction of the pile body (100). The upper side of the grouting cavity (120) is connected to a grouting channel (121), which is used to connect to a grouting pump. The lower side of the grouting cavity (120) is connected to a grout discharge channel (123). The grout discharge channel (123) has multiple channels and is spaced apart along the circumferential direction of the pile body (100). The grout discharge port of the grout discharge channel (123) passes through the outer wall surface of the pile body (100).

2. The PHC pipe pile according to claim 1, characterized in that, The slurry discharge channel (123) has a bent structure. The slurry discharge channel (123) includes a first channel and a second channel that are connected to each other. The first channel is connected to the grouting cavity (120). The slurry discharge port is located in the second channel. The second channel is inclined upward. And / or, the discharge port is provided with a sealing element (125).

3. The PHC pipe pile according to claim 1, characterized in that, The grouting channel (121) is connected to the side wall of the grouting cavity (120), and the grouting port of the grouting channel (121) passes through the outer wall of the pile body (100); Alternatively, the grouting channel (121) is connected to the upper wall of the grouting cavity (120).

4. The PHC pipe pile according to claim 1, characterized in that, The grouting channel (121) and the grouting pump outlet are equipped with pressure gauges, which are used to monitor the grouting pressure; And / or, the grouting channel (121) and the grouting pump outlet are equipped with flow meters, which are used to monitor the grouting flow rate.

5. The PHC pipe pile according to claim 4, characterized in that, The PHC pipe pile also includes an alarm device, which is electrically connected to the pressure gauge. The alarm device is used to issue an alarm signal when the grouting pressure monitored by the pressure gauge exceeds the preset pressure.

6. The PHC pipe pile according to claim 1, characterized in that, The upper end of the pile body (100) is fixedly provided with a first end plate (130), and the lower end of the pile body (100) is fixedly provided with a second end plate (140).

7. The PHC pipe pile according to claim 6, characterized in that, The distance between the upper wall of the annular cavity and the upper surface of the first end plate (130) is between 150-250 mm; And / or, the distance between the discharge port and the lower surface of the second end plate (140) is between 150-250 mm.

8. The PHC pipe pile according to claim 1, characterized in that, The lower end of the pile body (100) is fixed with a pile tip (110).

9. The PHC pipe pile according to claim 8, characterized in that, The pile tip (110) is a cross-shaped pile tip (110).

10. The PHC pipe pile according to claim 1, characterized in that, The pile body (100) has an inner wall surface and an outer wall surface, and a reinforcing cage is provided between the inner wall surface and the outer wall surface of the pile body (100); the grouting cavity (120) is located between the reinforcing cage and the inner wall surface of the pile body (100), or the grouting cavity (120) is located between the reinforcing cage and the outer wall surface of the pile body (100); And / or, the annular cavity is a circular cavity, and the annular width of the circular cavity is between 25-40 mm; And / or, the diameter of the slurry discharge channel (123) is between 25-40 mm; And / or, the diameter of the grouting channel (121) is between 25-40 mm.

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