External grouting type grouting bamboo joint pile applied to photovoltaic support
By setting up a cannula hole group on the bamboo piles, an efficient external grouting process is achieved, which solves the problems of cumbersome grouting process and insufficient pressure, and significantly improves the bearing capacity and connection strength of the bamboo piles.
Patent Information
- Application Number
- CN202420524449.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-03-18
AI Technical Summary
The existing grouting bamboo joint piles have cumbersome processes and the grouting pressure cannot be increased, resulting in loose structure of the grouting layer and unable to effectively increase the pile side friction resistance.
The external grouting grouting bamboo poles are used to set up a cannula hole group on the bamboo poles. The cannula hole is used to insert grouting pipes. The cement slurry is injected into the gap between the bamboo poles and the underground soil through the grouting pipe to form a cladding shell to improve the connection strength between the pile and the soil.
The grouting process is simplified, the grouting efficiency and pressure are improved, and a tighter cladding shell is formed, which significantly improves the vertical compression, pull-out bearing capacity and horizontal bearing capacity of the piles to adapt to different formation conditions.
Smart Images
Figure CN222810060U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an external grouting type grouting bamboo-joint pile applied to a photovoltaic bracket. The external grouting type grouting bamboo-joint pile is used as an underground pile foundation of the photovoltaic bracket and can also be used as an underground pile foundation of other buildings. Background Art
[0002] Due to the high construction efficiency, photovoltaic brackets use a large number of prefabricated piles. As a type of prefabricated pile, bamboo piles have bamboo protrusions protruding outward on the pile body, which can improve the lateral friction resistance of bamboo piles and have high compressive bearing capacity and pull-out bearing capacity, and are therefore widely used. In the specific use of bamboo piles, grouting is performed between the bamboo piles and the underground soil to form grouting bamboo piles, so as to improve the lateral friction resistance between the bamboo piles and the underground soil.
[0003] During the construction of the existing grouting bamboo pile, a grouting channel connecting the inside and outside of the pile body is generally opened radially on the pile body of the bamboo pile. During grouting, the grouting pipe needs to be inserted into the grouting channel through the center hole of the bamboo pile before grouting outward through the grouting channel. Due to the large depth of the bamboo pile, it is impossible to ensure that the grouting pipe can be inserted into the grouting channel in a sealed manner, which easily causes cement slurry to directly enter the center hole of the bamboo pile, not only affecting the grouting effect, but also unable to increase the grouting pressure. Generally, only a low-pressure grouting method below 5MPa can be used for grouting, which also causes the structure of the grouting layer to be relatively loose and unable to increase the friction resistance on the pile side. In order to facilitate grouting, it is also necessary to set up leak-proof air bags above and below the grouting location to form a relatively closed grouting cavity between the two leak-proof air bags, resulting in a cumbersome grouting process and high cost. Utility Model Content
[0004] In order to solve the problems of complicated grouting process and inability to increase grouting pressure in the prior art, the present application proposes an external grouting bamboo pile for photovoltaic brackets, which includes a bamboo pile sunk underground, the bamboo pile includes a pile body and a plurality of bamboo protrusions arranged on the pile body, the bamboo protrusions are ring-shaped, and the plurality of bamboo protrusions extend around the outer peripheral surface of the pile body and are arranged at intervals along the axial direction of the pile body. 1-5 pipe insertion hole groups are arranged on the bamboo pile, and each pipe insertion hole group includes a pipe hole arranged on each bamboo. A pipe insertion hole on the joint protrusion, the pipe insertion holes in the same pipe insertion hole group are coaxially arranged along the axial direction of the pile body; there is a covering shell between the bamboo joint pile and the underground soil; the pipe insertion hole is used to insert a grouting pipe, when the grouting pipe is inserted into the pipe insertion hole, cement slurry can be injected into the gap between the bamboo joint pile and the underground soil through the grouting pipe, and the cement slurry forms the covering shell after solidification. After the injection of cement slurry is completed, the grouting pipe can be pulled out and recovered; a grouting port is arranged at the lower end of the grouting pipe and only at the lower end of the grouting pipe. Specifically, the distance between two adjacent bamboo joint protrusions is 1-3 meters.
[0005] The external grouting bamboo pile in this application is constructed by the following steps:
[0006] (1) The bamboo pile with the grouting pipe is sunk into the ground, and the space between two adjacent bamboo protrusions is formed into a grouting cavity.
[0007] (2) Inject cement slurry into the gap between the bamboo pile and the underground soil through the grouting pipe, lift the grouting pipe upward while grouting, and inject cement slurry into each slurry cavity from bottom to top until the lower end of the grouting pipe is above the ground. After the cement slurry solidifies, it forms a coating shell. During the grouting process, after the cement slurry flows through the gap between the bamboo protrusion and the pile hole, it connects the cement slurry on the upper and lower sides of the bamboo protrusion.
[0008] When lifting the grouting pipe, continuous lifting or intermittent lifting can be used. When continuous lifting is used, the grouting pipe is continuously lifted upward at a certain speed; when intermittent lifting is used, each time it is lifted to a grouting position, it stays at the grouting position for a period of time. After the grouting is completed at the grouting position, it is lifted upward to the next grouting position for grouting. There is no essential difference between the two lifting methods. In the two lifting methods, the average lifting speed of the grouting pipe is the same.
[0009] The grouting pipe is lifted by intermittent lifting method. After lifting the grouting pipe 100-300mm each time, the grouting pipe is kept for 3-10 minutes. When the continuous lifting method is adopted, the grouting pressure needs to be adjusted accordingly when lifting the grouting pipe, so that different grouting pressures can be used for different areas according to needs to adjust the density of cement soil in the corresponding area. The lifting speed of the grouting pipe is controlled at 10-15cm / min.
[0010] In the present application, a pipe insertion hole is provided on the bamboo protrusion, so that the grouting pipe can gradually inject cement slurry into the gap between the bamboo pile and the underground soil from bottom to top, and the bamboo pile and the underground soil are connected as a whole by utilizing the coating shell formed by the cement slurry. Due to the dividing effect of the bamboo protrusion, the gap between the bamboo pile and the underground soil can be naturally divided into several slurry cavities, thereby avoiding the use of the plugging air bag used in the prior art, and the grouting pressure can be increased in the local area as needed to increase the density of the cement soil in the corresponding area, as well as the distance that the cement slurry penetrates into the surrounding soil, so as to ensure the side friction resistance of the pile.
[0011] During the formation process of the coating shell of the present application, there is no need for the docking process between the grouting pipe and the grouting channel in the pile body, which simplifies the grouting process, can effectively improve the grouting efficiency, and also avoids the sealing problem between the grouting pipe and the grouting channel. The appropriate grouting pressure can be set according to the needs, without limiting the grouting pressure to less than 5MPa, so that the grouting position setting is flexible and the grouting effect is reliable. Since high-pressure grouting can be used, the cement slurry can be diffused into the surrounding soil to form a cement soil reinforcement body around the pile, so that the vertical compression and pull-out bearing capacity of the grouting bamboo pile is high, and the horizontal bearing capacity is also correspondingly improved. This makes the present application adaptable to silty soil, clay, sand, silt, rock, etc., and has a wide stratum adaptability.
[0012] Further, the space between two adjacent bamboo protrusions is formed into a slurry cavity, and the part of the coating shell located in the slurry cavity is formed into a cement soil ring, and the upper density of the cement soil ring is greater than its lower density, or the lower density of the cement soil ring is greater than its upper density. According to the main needs of the underground pile body, the underground pile body is divided into compression piles and pull-out piles. Of course, the two are not completely different. The compression pile also has the function of a pull-out pile, and the pull-out pile also has the function of a compression pile. When the grouting bamboo pile is mainly used as a pull-out pile, it is necessary to make the lower density of the cement soil ring greater than the upper density of the cement soil ring so that the lower side of the cement soil ring can withstand greater pressure. When the grouting bamboo pile is mainly used as a compression pile, it is necessary to make the upper density of the cement soil ring greater than the lower density of the cement soil ring so that the upper side of the cement soil ring can withstand greater pressure.
[0013] Specifically, the bamboo pile is directly pressed into the ground, or the bamboo pile is pressed into the pile hole underground. The present application has no special requirements for the way the bamboo pile is pressed into the ground, and both the existing technology and the new technology can be used. The bamboo pile can be sunk underground by different methods according to different soil qualities and needs. When the soil is hard and the existing piling equipment cannot or is not easy to directly sink the bamboo pile into the ground, the bamboo pile can be sunk underground by digging the pile hole first and then sinking the bamboo pile into the pile hole, or the construction area does not allow the use of equipment with high noise, or in order to avoid the problem of soil squeezing caused by direct piling, it is necessary to dig the pile hole first and then sink the bamboo pile into the pile hole to sink the bamboo pile underground. When constructing in an area with softer soil, it is preferred to use the method of pressing the bamboo pile underground for construction, and specifically conventional piling methods such as static pressure, vibration, and hammering can be used.
[0014] Specifically, all the insertion holes in the same insertion hole group are through holes, and the grouting pipe can pass through all the insertion holes in the same insertion hole group from top to bottom in sequence; or in the same insertion hole group, except for the insertion hole on the bamboo joint protrusion located at the lowermost end which is a blind hole opening upward, the insertion holes on the other bamboo joint protrusions are through holes, and the grouting pipe can pass through all the insertion holes that are through holes in the same insertion hole group from top to bottom in sequence and then be inserted into the insertion holes that are blind holes.
[0015] The above two methods of setting the insertion holes can be selected according to different requirements and different ways of the bamboo pile being pressed into the ground to achieve the best effect. When the bamboo pile is sunk by drilling the pile hole first and then sinking the bamboo pile into the pile hole, it is preferred that all the insertion holes in the same insertion hole group are through holes, so that the grouting pipe can inject cement slurry into the space below the lowest bamboo protrusion, so that the cavity in the pile hole can be compacted with cement slurry, thereby improving the connection strength between the bamboo pile and the underground soil.
[0016] When the bamboo piles are sunk into the ground without digging pile holes, the selection can be made according to the specific conditions of the soil. When the underground soil is hard, the pipe hole on the lowest bamboo protrusion can be set as a blind hole, and the blind hole can be used to protect the grouting port of the grouting pipe to prevent soil from entering the grouting pipe without the need to use a plug to temporarily protect the grouting port. However, when the underground soil is soft, it is best to set each pipe hole as a through hole to facilitate the use of cement slurry to grout and harden the soil on the lower side of the lowest bamboo protrusion, thereby increasing the hardness of this part of the soil and improving the connection force between the bamboo pile and the soil. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is the first structural schematic diagram of external grouting bamboo pile.
[0018] Figure 2 It is the second structural schematic diagram of the external grouting bamboo pile.
[0019] Figure 3 It is the construction flow chart of external grouting bamboo piles. DETAILED DESCRIPTION
[0020] The following is an explanation of the structure of the external grouting bamboo pile used in photovoltaic brackets. Figure 1The grouting bamboo pile includes a bamboo pile 20 sunk into an underground pile hole 110, the bamboo pile 20 includes a pile body 21 and seven bamboo protrusions 22 arranged on the pile body 21. Only part of the bamboo protrusions 22 are shown in the accompanying drawings. The bamboo protrusions 22 are annular, and the bamboo protrusions 22 extend around the outer circumference of the pile body 21 and are arranged at intervals along the axial direction of the pile body. The distance between two adjacent bamboo protrusions is 2 meters. It can be understood that in other embodiments, the distance between two adjacent bamboo protrusions can also be 1 meter, 1.5 meters, 2.5 meters or 3 meters. Of course, it can also be other distances between 1-3 meters as needed.
[0021] The bamboo pile is provided with three pipe insertion hole groups, each of which includes a pipe insertion hole 24 provided on each bamboo protrusion, and the pipe insertion holes 24 in the same pipe insertion hole group are coaxially arranged along the axial direction of the pile body 21. In the bamboo pile 20, the bamboo protrusion at the lowest end is spaced apart from the pile bottom end surface.
[0022] There is a covering shell 41 between the bamboo pile and the underground soil 130. Figure 1 In the figure, only the lower half of the covering shell 41 is shown. The grouting pipe 31 can be inserted into a plug hole in a plug hole group, and cement slurry is injected between the bamboo pile and the underground soil, and the cement slurry is solidified to form the covering shell. The grouting pipe 31 can be pulled out and recovered after the grouting is completed.
[0023] Each of the insertion holes is a through hole, and the grouting pipe can pass through all the insertion holes in the same insertion hole group from top to bottom in sequence and reach the lowermost end of the pile hole.
[0024] In this embodiment, the space between two adjacent bamboo protrusions is formed into a slurry cavity 23, and the portion of the covering shell located in the slurry cavity is formed into a cement soil ring, and the density of the upper side of the cement soil ring is greater than the density of the lower side, so that the grouting bamboo pile in this embodiment can be used as a compression pile. It can be understood that in another embodiment, when the grouting bamboo pile needs to be used as a pull-out pile, the density of the lower side of the cement soil ring needs to be greater than the density of the upper side.
[0025] In this embodiment, the bamboo pile 20 is sunk into the pile hole 110, and all the insertion holes are through holes, so that the grouting pipe can extend downward into the space between the last bamboo protrusion and the bottom of the pile hole, and inject cement slurry into the space. Figure 2 In another embodiment, when the bamboo pile 20 is directly pressed into the ground without digging the pile hole, the grouting hole on the lowest bamboo protrusion can be set as a blind hole 25, and the lower end of the grouting pipe is inserted into the blind hole. The blind hole is used to protect the grouting port at the lower end of the grouting pipe to prevent the grouting pipe from being blocked by soil in the grouting port when the bamboo pile is pressed into the ground, thereby affecting the discharge of cement slurry.
[0026] The following is an explanation of the construction method of the external grouting bamboo pile in Example 1. Figure 3 , the construction method specifically comprises the following steps:
[0027] (1) Please refer to Figure 3 In step (a), a pile hole 110 is drilled underground using a long spiral boring machine, see Figure 3 In step (b), the bamboo pile 20 carrying the grouting pipe 31 is then sunk into the pile hole 110. A grouting pipe 31 is provided for each insertion hole group. In this embodiment, all the insertion holes are through holes. Each grouting pipe 31 passes through all the insertion holes in the corresponding insertion hole group from top to bottom in sequence to reach the bottom of the pile hole. It can be understood that in another embodiment, the bamboo pile can be directly pressed into the ground without drilling the pile hole.
[0028] The space between two adjacent bamboo-node protrusions is formed into a slurry cavity 23, and a grouting port is provided at and only at the lower end of the grouting pipe, and the grouting port faces downward.
[0029] (2) Please refer to Figure 3 In step (c), cement slurry is injected into the gap between the bamboo pile 20 and the underground soil 130 through the grouting pipe, and the grouting pipe is lifted upward while grouting, and cement slurry is injected into each slurry cavity from bottom to top in sequence. Figure 3 Step (d) in the process, until the lower end of the grouting pipe is 120 degrees above the ground. After the cement slurry solidifies, it forms a coating shell 41. When lifting the grouting pipe, it can be carried out by continuous lifting or intermittent lifting. When continuous lifting is adopted, the grouting pipe is continuously lifted upward at a certain speed; when intermittent lifting is adopted, each time it is lifted to a grouting position, it stays at the grouting position for a period of time. After the grouting is completed at the grouting position, it is lifted upward to the next grouting position for grouting. There is no essential difference between the two lifting methods. In the two lifting methods, the average lifting speed of the grouting pipe is the same. Specifically in the present embodiment, the grouting pipe is lifted by the intermittent lifting method. After the grouting pipe is lifted upward by 100-300 mm each time, the grouting pipe is left for 3-10 minutes.
[0030] During the grouting process, the cement slurry flows through the gap between the bamboo joint protrusion and the pile hole, connecting the cement slurry on the upper and lower sides of the bamboo joint protrusion.
[0031] Since the grouting bamboo pile in this embodiment is used as a compression pile, the density of the upper side of the cement soil ring is greater than the density of the lower side, so the grouting pressure at the upper end of the slurry cavity is greater than the grouting pressure at the lower end of the slurry cavity. When grouting the upper end of the slurry cavity, a first pressure is used, and when grouting the lower end of the slurry cavity, a second pressure is used. Specifically in this embodiment, the first pressure is specifically 12MPa, and the second pressure is specifically 2MPa. It can be understood that according to different needs, the first pressure can also be 10MPa, 14MPa, 16MPa, 18MPa or 20MPa, and of course it can also be other pressure values between 10-20MPa, and the second pressure can also be 1MPa, 3MPa, 4MPa, 5MPa or 6MPa, and of course it can also be other pressure values between 1-6MPa.
[0032] It can be understood that when the grouting bamboo pile is needed to be used as a pull-out pile, the density of the lower side of the cement soil ring needs to be greater than the density of the upper side. At this time, the grouting pressure at the upper end of the slurry cavity needs to be lower than the grouting pressure at the lower end of the slurry cavity.
[0033] Since the bamboo protrusion at the lowest end of the bamboo pile 20 is at a distance from the end face of the pile bottom, and all the pipe insertion holes are through holes, the grouting pipe can pass downward through the pipe insertion hole 24 on the bamboo protrusion 22 at the lowest end and reach the lowest end of the pile hole to grout the space between the pile bottom and the bamboo protrusion at the lowest end.
Claims
1. An external grouting bamboo pile used for photovoltaic support, characterized in that: The utility model comprises a bamboo joint pile sunk underground, which comprises a pile body and a plurality of bamboo joint protrusions arranged on the pile body, wherein the bamboo joint protrusions are ring-shaped, extend around the outer peripheral surface of the pile body and are arranged at intervals along the axial direction of the pile body, and 1-5 pipe insertion hole groups are arranged on the bamboo joint pile, each pipe insertion hole group comprises a pipe insertion hole arranged on each bamboo joint protrusion, and the pipe insertion holes in the same pipe insertion hole group are coaxially arranged along the axial direction of the pile body; a covering shell is provided between the bamboo joint pile and the underground soil; the pipe insertion hole is used for inserting a grouting pipe, and when the grouting pipe is inserted into the pipe insertion hole, cement slurry can be injected into the gap between the bamboo joint pile and the underground soil through the grouting pipe, and the cement slurry forms the covering shell after solidification, and after the cement slurry is injected, the grouting pipe can be pulled out and recovered; a grouting port is provided at the lower end of the grouting pipe and only at the lower end of the grouting pipe.
2. The external grouting bamboo pile according to claim 1 is characterized in that: The space between two adjacent bamboo protrusions forms a slurry cavity, and the part of the covering shell located in the slurry cavity forms a cement soil ring, the upper density of the cement soil ring is greater than the lower density, or the lower density of the cement soil ring is greater than the upper density.
3. The external grouting bamboo pile according to claim 1 is characterized in that: The bamboo piles are directly pressed into the ground, or the bamboo piles are pressed into pile holes in the ground.
4. The external grouting bamboo pile according to claim 1, characterized in that: All the insertion holes in the same insertion hole group are through holes, and the grouting pipe can pass through all the insertion holes in the same insertion hole group from top to bottom in sequence; or In the same pipe insertion hole group, except for the pipe insertion hole on the bamboo joint protrusion at the lowest end which is a blind hole opening upward, the pipe insertion holes on the other bamboo joint protrusions are all through holes. The grouting pipe can pass through all the pipe insertion holes that are through holes in the same pipe insertion hole group from top to bottom in sequence and then be inserted into the pipe insertion holes that are blind holes.
5. The external grouting bamboo pile according to claim 1, characterized in that: The distance between two adjacent bamboo node protrusions is 1-3 meters.