Layered soil permeable pipe pile system

Abstract

The invention discloses a layered soil permeable pipe pile system, and relates to the technical field of foundations of fixed buildings, the layered soil permeable pipe pile system comprises a permeable pipe pile, the permeable pipe pile is provided with a horizontal drainage channel and a vertical drainage channel, the horizontal drainage channel comprises a permeable hole formed in a pile body, and a permeable hole is formed in the position, corresponding to a soft soil layer of a layered soil foundation, of the pile body; and the vertical drainage channel extends into a soft soil layer of the layered soil foundation from the upper part of the pile body. According to the layered soil permeable pipe pile system, the horizontal drainage channels and the vertical drainage channels are formed in the positions, where the corresponding soft soil layers are located, of the pile body, so that in the pile sinking process of a layered soil foundation, the influence of unsmooth drainage of the drainage channels in the pile sinking process is reduced, and the effect of rapidly dissipating ultra-static hole pressure is achieved; corresponding measures are adopted for different soil layers of layered soil to improve the bearing capacity of the pipe pile, and the friction force between the periphery of the pile and the layer can be improved through the drainage consolidation effect of the drainage channel of the soft soil layer, so that the bearing capacity is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation technology for fixed buildings, specifically to a permeable pipe pile system for layered soil. Background Technology

[0002] Stratified soil refers to a geological structure formed by the accumulation of soil layers with different properties. It is a common foundation type in civil engineering, exhibiting obvious stratification with differences in particle composition and properties between different layers. These differences in properties between soil layers can affect pile foundations and their construction. For example, soft sand layers have high permeability and are prone to liquefaction, leading to pile instability. Soft soil layers have high water content, high compressibility, and low permeability, easily causing soil squeezing during pile driving and generating excess pore water pressure. This can manifest macroscopically as ground heave, and if buildings are located near the construction area, it can easily cause damage to surrounding structures. Chinese patent document CN218521762U discloses a permeable pipe pile with horizontal drainage channels. During pile driving, the drainage and consolidation effect of these channels accelerates the dissipation of excess pore water pressure. However, due to the different properties of the soil layers, the permeable pipe pile is prone to blockage of the horizontal drainage channels during pile driving, affecting the drainage and consolidation effect of the permeable pipe pile system. Summary of the Invention

[0003] To address the above shortcomings, the present invention aims to provide a permeable pipe pile system suitable for stratified soil foundations.

[0004] Therefore, the present invention provides a permeable pipe pile system for stratified soil, comprising a permeable pipe pile, wherein the permeable pipe pile is provided with a horizontal drainage channel and a vertical drainage channel, wherein the horizontal drainage channel includes a permeable hole provided on the pile body, and the permeable hole is provided on the pile body at a position corresponding to the soft soil layer of the stratified soil foundation, and the vertical drainage channel extends from the upper part of the pile body into the soft soil layer of the stratified soil foundation.

[0005] Furthermore, the permeable holes are arranged in several layers at equal intervals, and each layer has several permeable holes arranged at equal intervals on the pile body. The permeable holes extend into the interior of the pile body and drain water outward through the drainage channel inside the pile body.

[0006] Furthermore, the vertical drainage channel includes a drainage trough vertically installed on the outer wall of the pile body.

[0007] Furthermore, the drainage ditch and the permeable hole are provided with retaining wire mesh on the outside, and permeable stones are provided on the inside of the wire mesh.

[0008] Furthermore, the permeable holes are set in the drainage channel, and the wire mesh is at a specified distance from the outer wall of the pile body for the purpose of detachably connecting a retaining plate on the outside of the wire mesh for retaining soil during the driving process of the permeable pipe pile.

[0009] Furthermore, the permeable pipe pile is also provided with grouting holes, which are connected to grouting pipes. The grouting pipes extend to the upper part of the permeable pipe pile. Grouting holes are provided on the outer wall of the pile body above the permeable holes. After the permeable pipe pile enters the soil, the horizontal drainage channel and / or vertical drainage channel are used for drainage consolidation. After drainage consolidation, grout is injected into the soil around the pile through the grouting holes.

[0010] Furthermore, the grouting hole and the drainage channel are offset from each other.

[0011] Furthermore, the permeable holes are staggered from the reinforcing bars of the permeable pipe pile, and the grouting pipe is fixed to the reinforcing bars of the permeable pipe pile and cast into the pile body.

[0012] Furthermore, the permeable pipe pile is processed using a concrete centrifugal rotation process. A convex template is fixed to the corresponding position of the forming mold of the permeable pipe pile by bolts. A wire mesh is set on the side of the convex template facing the center of the forming mold, and a foam block is set on the side of the wire mesh facing the center of the forming mold to form a drainage channel. The width of the wire mesh is greater than the width of the drainage channel, so that after the concrete is formed, the two ends of the wire mesh are fixed in the pile body.

[0013] Furthermore, a metal strip is pre-embedded in the middle of the foam block, and bolts pass through the convex template to fix it to the metal strip and clamp the wire mesh.

[0014] The beneficial technical effects of this invention are as follows:

[0015] (1) The permeable pipe pile system for stratified soil of the present invention, according to the results of geological exploration, sets up horizontal and vertical drainage channels at the pile body position where the corresponding soft soil layer is located, so as to reduce the impact of poor drainage in the drainage channel during the pile driving process of stratified soil foundation, and play the role of quickly dissipating excess pore pressure; it also plays the role of adopting corresponding measures for different soil layers of stratified soil to improve the bearing capacity of the pipe pile, and the drainage consolidation effect of the drainage channel in the soft soil layer can improve the friction between the pile and the layer, thereby improving the bearing capacity.

[0016] (2) In a specific embodiment, steel wire mesh and permeable stones are also set to prevent the soil from blocking the permeable holes and affecting the foundation reinforcement of the soft soil layer during the drainage consolidation process. In addition, the soil can block the drainage channel during the pile driving process by setting up retaining plates. Furthermore, during the drainage process, the problem of soft soil consolidating on the steel wire mesh and affecting subsequent drainage can be solved by repeatedly inserting and pulling out the retaining plates at this position.

[0017] (3) In a specific embodiment of the present invention, a grouting pipe is also included, which can inject grout into the soil around the pile to improve the bearing capacity of the pipe pile. For example, if the layered soil includes a soft sand layer, the soft sand layer is combined with the pile by grouting in the corresponding soil layer, which increases the contact area and improves the bearing capacity of the pipe pile. In particular, when the soft sand layer or soil layer is above the soft soil layer, the drainage consolidation effect of the drainage channel will generate voids or gaps between the soft soil layer and the upper soil layer to a certain extent. Grouting holes are set above the corresponding soft soil layer and the permeable hole, and grouting is performed after drainage consolidation, so that the soil around the pile is compacted and the bearing capacity of the pipe pile can be improved. Attached Figure Description

[0018] Figure 1 A schematic diagram illustrating a specific embodiment of the permeable pipe pile system for layered soil according to the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the permeable holes and grouting holes;

[0020] Figure 3 This is a top view of a permeable pipe pile.

[0021] Figure 4 A schematic diagram showing the setup of the shaping mold, the convex template, the wire mesh, and the foam block;

[0022] Figure 5 This is a schematic diagram showing the setup of the convex template, wire mesh, and foam block through a sectional view.

[0023] Explanation of reference numerals in the attached drawings: 1. Permeable pipe pile; 2. Permeable hole; 3. Drainage channel; 4. Layered soil; 401. Soft soil layer; 5. Grouting pipe; 6. Grouting hole; 7. Retaining board; 8. Wire mesh; 9. Permeable stone; 10. Formwork; 11. Foam block; 12. Metal strip; 13. Protruding formwork. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] Reference Figures 1 to 5 As shown, a permeable pipe pile system for layered soil according to the present invention includes a permeable pipe pile 1. The permeable pipe pile 1 is provided with a horizontal drainage channel and a vertical drainage channel. The horizontal drainage channel includes permeable holes 2 provided on the pile body. The permeable holes 2 are provided on the pile body at positions corresponding to the soft soil layer 401 of the layered soil foundation. The vertical drainage channel extends from the upper part of the pile body into the soft soil layer 401 of the layered soil foundation. In the foundation treatment process, the permeable pipe pile system is generally set with multiple piles at certain intervals to form a pile group foundation. Figure 1The image shows one of the permeable pipe piles 1. The permeable holes 2 are located at least within the pile body section corresponding to the soft soil layer 401. The permeable holes 2 are positioned to avoid the reinforcing bars inside the pile body. The reinforcing bars include main bars along the length of the pile body and stirrups. The permeable pipe pile 1 can be manufactured using a centrifugal concrete rotation process. The permeable holes 2 can be drilled after the pile body is formed, or prefabricated pipe components can be fixed to the reinforcing cage and formed together with the concrete pile body. The permeable pipe pile 1 can be driven into the layered soil 4 using a pile driver. Water in the soft soil layer 401 can enter the interior of the pile body through the permeable holes 2. A sealed cap can be installed on the top of the permeable pipe pile 1, and a pipe can be connected to the interior of the pile. The pipe is connected to a vacuum pump, which is used for drainage and consolidation. To improve the efficiency of soft soil drainage and consolidation, air can also be injected into the soft soil layer 401 around the pile. During the process of the pile driving into the soil, the soil around the pile can easily clog the permeable hole 2. In existing technology, this is usually prevented by pre-drilling a hole, driving a pile into the hole, and / or placing a plug in the permeable hole 2, with the plug connected to a rope. After the pile is driven, the plug is pulled out using the rope, thus preventing the soil around the pile from clogging the permeable hole during the pile driving process. (Refer to...) Figure 1 and Figure 3 As shown, in this embodiment, the drainage problem caused by the blockage of the drainage channel is reduced by adding a vertical drainage channel. The vertical drainage channel includes a drainage trough 3 set on the outer wall of the pile body along the length of the pile body. The drainage trough 3 can be filled with foam blocks or a convex template can be set to form the drainage trough 3 during concrete pouring.

[0026] In the above embodiments, reference is made to Figure 1 and Figure 2 As shown, the permeable holes 2 are arranged in several layers at equal intervals. Each layer has several permeable holes 2 arranged at equal intervals on the pile body. The shape of the permeable holes 2 can be circular, elliptical, or other shapes. The permeable holes 2 are perpendicular to the pile body (the length direction of the pile). After water enters the inside of the pile body, it is discharged through the upper part of the pile.

[0027] In the above embodiments, reference is made to Figure 3As shown, in order to prevent the soft soil layer 401 from blocking the permeable holes 2 and drainage channels 3 during the pile driving and drainage consolidation process, a retaining wire mesh 8 is provided on the outside of the drainage channels 3 and the permeable holes 2. The permeable holes 2 can be set in the drainage channels 3. In this case, the wire mesh 8 can be set only on the outside of the drainage channels 3. Before or after pile driving, permeable stones 9 are placed in the drainage channels 3. The shape and size of the permeable stones 9 should not pass through the permeable holes 2. Of course, the wire mesh 8 can also be set on the outside of the permeable holes 2. Furthermore, the wire mesh 8 is positioned at a specified distance from the outer wall of the pile. A retaining plate 7 can be inserted into the outer groove. The upper end of the retaining plate 7 can be bolted to the pile top or pile cap for retaining soil during the driving process of the permeable pipe pile 1. After driving, the retaining plate 7 is removed and pulled out, exposing the permeable hole 2 and drainage channel 3 for drainage. During the drainage consolidation process, the retaining plate 7 can be periodically inserted and pulled out to break up the soft soil consolidated around the pile, preventing the consolidated soil from affecting subsequent drainage and consolidation. The wire mesh 8 and the corresponding drainage channel 3 can be formed using the following method, refer to... Figure 4 and Figure 5 As shown, based on the existing concrete centrifugal rotation process of the permeable pipe pile 1, the forming mold of the permeable pipe pile 1 is fixed with bolts to the convex template 13 at the position of forming the drainage channel 3. The convex template 13 is arranged with wire mesh 8 and foam block 11 on the side facing the center of the forming mold to form the drainage channel 3. The width of the wire mesh 8 is greater than the width of the drainage channel 3, so that after the concrete is formed, the two ends of the wire mesh 8 are fixed in the pile body. The wire mesh can also be welded to the short bars, and the short bars are then welded to the reinforcing cage. The foam block 11 has a metal strip 12 embedded inside. The bolt passes through the convex template 13 and is fixed to the metal strip 12. The metal strip 12 and the convex template 13 clamp and fix the wire mesh 8. Metal strips 12 are installed in the foam block 11 to prevent significant deformation of the foam block 11 during centrifugation. The foam block 11 can prevent the metal strips 12 from bonding with the concrete. The metal strips 12 and the protruding template 13 clamp the wire mesh 8 to prevent the wire mesh 8 from shifting during centrifugation. The wire mesh 8 has a large width and can be formed in the concrete pile body. When demolding, the bolts, the forming template 10 and the protruding template 13 are removed. After removing the foam, the metal strips 12 are carefully pulled out from one end of the drainage channel 3 to form the drainage channel 3. The wire mesh 8 on the outside of the permeable hole 2 can be fixed to the pre-embedded permeable hole 2 pipe fitting. The prefabricated permeable hole pipe fitting is fixed to the reinforcing cage. When the prefabricated permeable hole pipe fitting is far away from the reinforcing bars of the reinforcing cage, it can be connected and fixed by welding short bars.

[0028] In the above embodiments, reference is made to Figure 3As shown, the permeable pipe pile 1 can also be provided with grouting holes 6. The grouting holes 6 are connected to the grouting pipe 5. The grouting pipe 5 extends to the upper part of the permeable pipe pile 1. The grouting holes 6 are provided on the outer wall of the pile body above the permeable hole 2. The grouting holes 6 are located on the pile body of the loose sand layer corresponding to the layered soil 4, and on the pile body above the permeable hole 2. After the permeable pipe pile 1 enters the soil, the horizontal and / or vertical drainage channels are used for drainage consolidation. When the drainage consolidation reaches a certain level, such as when the drainage volume is very small after vacuum pumping, it indicates that the soft soil layer 401 around the pile has been consolidated. After the soft soil is consolidated, its volume shrinks, which easily creates pores and voids in the loose layer of the stratified soil 4 and the soft soil layer 401. The soft soil layer 401 itself is prone to pore formation during consolidation, while the loose layer itself has a weak bearing capacity. After drainage consolidation, grouting is injected into the loose sand layer around the pile and above the soft soil layer 401 through the grouting hole 6. This can improve the bearing capacity of the loose sand layer and fill the pores formed by drainage, thereby improving the bearing capacity of the soil. Furthermore, since the soft soil is consolidated around the permeable hole 2, grouting generally will not cause the permeable hole 2 to be blocked, and the permeable hole 2 can still continue to drain water in the future. The grouting hole 6 is staggered from the drainage channel 3. The grouting pipe 5 can be fixed to the reinforcing steel of the permeable pipe pile 1 and cast into the pile body.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple 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 permeable pipe pile system for layered soil, comprising permeable pipe piles, characterized in that: The permeable pipe pile is provided with a horizontal drainage channel and a vertical drainage channel. The horizontal drainage channel includes permeable holes on the pile body. The permeable holes are provided on the pile body at the position corresponding to the soft soil layer of the stratified soil foundation. The vertical drainage channel extends from the upper part of the pile body into the soft soil layer of the stratified soil foundation.

2. The permeable pipe pile system for layered soil according to claim 1, characterized in that: The permeable holes are arranged in several layers at equal intervals, and each layer has several permeable holes arranged at equal intervals on the pile body. The permeable holes extend into the interior of the pile body and drain water outward through the drainage channel inside the pile body.

3. A permeable pipe pile system for layered soil according to claim 1 or 2, characterized in that: The vertical drainage channel includes a drainage trough vertically installed on the outer wall of the pile.

4. A permeable pipe pile system for layered soil according to claim 3, characterized in that: The drainage ditch and the permeable hole are provided with retaining wire mesh on the outside and permeable stones on the inside of the wire mesh.

5. A permeable pipe pile system for layered soil according to claim 4, characterized in that: The permeable holes are set in the drainage channel, and the wire mesh is at a specified distance from the outer wall of the pile body for the purpose of detachably connecting the retaining plate on the outside of the wire mesh for soil retention during the driving process of the permeable pipe pile.

6. A permeable pipe pile system for layered soil according to claim 5, characterized in that: The permeable pipe pile is also provided with grouting holes, which are connected to grouting pipes. The grouting pipes extend to the upper part of the permeable pipe pile. Grouting holes are provided on the outer wall of the pile body above the permeable holes. After the permeable pipe pile enters the soil, the horizontal drainage channel and / or vertical drainage channel are used for drainage consolidation. After drainage consolidation, grout is injected into the soil around the pile through the grouting holes.

7. A permeable pipe pile system for layered soil according to claim 6, characterized in that: The grouting hole and the drainage channel are offset from each other.

8. A permeable pipe pile system for layered soil according to claim 6, characterized in that: The permeable holes are staggered from the reinforcing bars of the permeable pipe pile, and the grouting pipe is fixed to the reinforcing bars of the permeable pipe pile and cast into the pile body.

9. A permeable pipe pile system for layered soil according to claim 6, characterized in that: The permeable pipe pile is processed using a centrifugal rotation process for concrete. A convex template is fixed to the corresponding position of the forming mold of the permeable pipe pile by bolts. A wire mesh is set on the side of the convex template facing the center of the forming mold, and a foam block is set on the side of the wire mesh facing the center of the forming mold to form a drainage channel. The width of the wire mesh is greater than the width of the drainage channel, so that after the concrete is formed, the two ends of the wire mesh are fixed in the pile body.

10. A permeable pipe pile system for layered soil according to claim 9, characterized in that: A metal strip is pre-embedded in the middle of the foam block, and bolts pass through the convex template to fix it to the metal strip and clamp the wire mesh.

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