PHC grouting pedestal pile
By using prefabricated PHC pipe piles and cement mixing piles in the expansion piles, cement mortar is injected into a solid body, which solves the problems of complex process of expansion piles and insufficient pull-up bearing capacity in the existing expansion piles and expansion pile resistance, and realizes the problem of Efficient construction and improvement of resistance to pulling.
Patent Information
- Application Number
- CN202421056491.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The existing bottom-expanded pile pulling process is complex, the equipment investment is large, the construction quality is difficult to control, which can easily cause soil extrusion and noise, and the pulling load resistance is insufficient.
Prefabricated PHC pipe piles are combined with cement mixing piles, and cement mortar is injected into the PVC waterproof geotextile bag through grouting pipes to form a solid body, increase the bearing capacity and pull-out resistance of the pile end, simplify the construction technology, and avoid soil extrusion and noise. .
The bearing capacity and pull resistance of single piles are improved, the construction process is simplified, the waste of cement materials and environmental pollution are reduced, and the construction cost is reduced.
Smart Images
Figure CN222252074U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of base-enlarged piles, and specifically relates to a PHC grouting base-enlarged pile. Background Art
[0002] Pile foundation is a common foundation form used in construction projects. Commonly used ones include bored piles, PHC pipe piles, steel pipe piles, etc. Under the requirements of foundation bearing capacity and engineering cost, expanded bottom piles have shown great advantages. Especially when underground buildings are subject to large water buoyancy, expanded bottom pull-out piles can not only greatly improve the pull-out bearing capacity compared with equal-section pull-out piles, but also show great superiority in terms of economy. However, the existing expanded bottom pull-out piles are mostly formed by mechanical cutting, with many process links, long construction time, large equipment investment, and difficult to control the quality of the construction process, which is easy to cause soil squeezing effect. Utility Model Content
[0003] In order to solve or partially solve the problems existing in the related technology, the solution provided in the present application is to press the PHC pipe pile installed with a grouting pipeline system into the cement mixing pile, and inject cement mortar into the PVC waterproof geotextile bag at the bottom of the pile through the grouting pipe, which hardens to form a cement mortar consolidation body, thereby increasing the bite effect between the PHC pipe pile and the surrounding soil, and significantly improving the bearing capacity of the pile end and the pull-out resistance of the pipe pile.
[0004] The PHC grouting bottom-enlarged pile comprises a pile top sealing plate; a PHC pipe pile, a grouting pipe, a PVC waterproof geotextile bag, a pile bottom sealing plate, and a cement mortar enlarged head;
[0005] The PHC pipe pile is driven into the cement soil pile at a high pressure along the pile top design mark, a pile top sealing plate and a pile bottom sealing plate are respectively arranged at the top and bottom of the PHC pipe pile, a pile hole is opened in the center of the pile top sealing plate and the pile bottom sealing plate, a grouting pipe is installed inside the center of the PHC pipe pile, the top of the grouting pipe is connected to the pile hole of the pile top sealing plate, and the bottom of the grouting pipe is connected to the pile hole of the pile bottom sealing plate;
[0006] The bottom of the PHC pipe pile is sleeved with a PVC waterproof geotextile bag, and a sleeve hoop is used to lock the PHC pipe pile along the opening of the PVC waterproof geotextile bag.
[0007] Optionally, the PHC pipe piles are installed section by section, and upper and lower adjacent PHC pipe piles are firmly welded along the connecting piles.
[0008] Optionally, a pile top exhaust hole is provided on the pile top sealing plate.
[0009] Beneficial effects of the utility model:
[0010] The solution provided in this application is to implant the prefabricated PHC pipe pile into the cement mixing pile, thereby avoiding the noise and soil squeezing effect caused by traditional driving, and will not cause problems such as shrinkage holes and broken piles. The construction process is simple, and the friction resistance between the pile body and the soil can be increased, greatly improving the bearing capacity of the single pile.
[0011] High-pressure cement mortar is injected into the waterproof bag at the bottom of the pile. After solidification, an enlarged head is formed at the bottom of the pile, which increases the contact area between the pile bottom and the bearing layer. Compared with traditional enlarged bottom piles, the enlarged bottom length is controllable, the disturbance to the soil is small, and the mechanical properties of the soil around the pile are improved, which greatly improves the pile-soil bite force and the pull-out bearing capacity of the single pile.
[0012] It restricts the flow of cement slurry, prevents cement slurry from penetrating into the soil and polluting the environment, reduces the diffusion and waste of cement slurry, and saves the cost of cement and other materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure shown in the embodiment of the present application;
[0014] Figure 2 is a cross-sectional view of the AA portion shown in an embodiment of the present application;
[0015] Figure 3 is a cross-sectional view of the BB portion shown in an embodiment of the present application;
[0016] Figure 4 is a schematic diagram of a pile top sealing plate shown in an embodiment of the present application;
[0017] Figure 5 is a schematic diagram of a pile bottom sealing plate shown in an embodiment of the present application;
[0018] In the figure, 1-pile top cover plate; 2-PHC pipe pile; 3-grouting pipe; 4-pile welding point; 5-hoop; 6-PVC waterproof geotextile bag; 7-pile bottom cover plate; 8-cement mortar enlarged head; 9-cement mixing pile; 10-pile top exhaust hole; 11-pile hole; 12-pile top design elevation. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.
[0020] In the description of the present invention, unless otherwise specified, the terms "inside", "upper", "lower", etc. indicate positions or state relationships based on the positions or state relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.
[0022] Most of the existing expanded bottom anti-pullout piles are formed by mechanical cutting, which involves many process steps, long construction time, large equipment investment, and difficult to control the quality of the construction process, which can easily cause soil squeezing effect.
[0023] In view of the above problems, the solution provided by the present application is to implant the prefabricated PHC pipe pile into the cement mixing pile, thereby avoiding the noise and soil squeezing effect caused by traditional driving, and will not cause problems such as shrinkage holes and broken piles. The construction process is simple, and the friction resistance between the pile body and the soil can be increased, thereby greatly improving the bearing capacity of a single pile.
[0024] High-pressure cement mortar is injected into the waterproof bag at the bottom of the pile. After solidification, an enlarged head is formed at the bottom of the pile, which increases the contact area between the pile bottom and the bearing layer. Compared with traditional enlarged bottom piles, the enlarged bottom length is controllable, the disturbance to the soil is small, and the mechanical properties of the soil around the pile are improved, which greatly improves the pile-soil bite force and the pull-out bearing capacity of the single pile.
[0025] It restricts the flow of cement slurry, prevents cement slurry from penetrating into the soil and polluting the environment, reduces the diffusion and waste of cement slurry, and saves the cost of cement and other materials.
[0026] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.
[0027] See also Figure 1-5 The present application provides a PHC grouting bottom-enlarged pile device, comprising a pile top sealing plate 1; a PHC pipe pile 2, a grouting pipe 3, a PVC waterproof geotextile bag 6, and a pile bottom sealing plate 7;
[0028] In this embodiment, the PHC pile 2 is pressed into the cement soil pile along the pile top design elevation 12, and the top and bottom of the PHC pile 2 are respectively provided with a pile top sealing plate 1 and a pile bottom sealing plate 7, and a pile hole 11 is provided in the center of the pile top sealing plate 1 and the pile bottom sealing plate 7, and a grouting pipe 3 is installed in the center of the PHC pile 2, and the top of the grouting pipe 3 is connected to the pile hole 11 of the pile top sealing plate 1, and the bottom of the grouting pipe 3 is connected to the pile hole 11 of the pile bottom sealing plate 7, and a pile top exhaust hole 10 is provided on the pile top sealing plate 1, which can discharge the internal gas during the grouting process. The grouting pipe 3 is made of Φ50 steel pipe. After the prefabricated PHC pile 2 is transported to the construction site, the Φ50 grouting pipe 3 is first welded to the pile bottom sealing plate 7 with the center opening; then it is inserted into the PHC pile 2, and the bottom sealing plate is welded to the bottom of the PHC pile 2 to prevent the slurry from entering the PHC pile 2 during the later grouting process.
[0029] The bottom of the PHC pile 2 is connected to the PVC waterproof geotextile bag 6, and the ferrule 5 is used to lock it on the PHC pile 2 along the opening of the PVC waterproof geotextile bag 6. Before putting the PVC waterproof geotextile bag 6 on the outside, the quality of the waterproof bag should be tested first, and it can only be used if it meets the requirements of the specification. After the welding of the bottom of the PHC pile 2 and the pile bottom sealing plate 7 is completed and cooled, the corresponding PVC waterproof geotextile bag 6 is selected according to the designed pile length and put on the bottom of the pile. The upper end of the bag mouth is fixed to the pile with a clamp.
[0030] Specifically, the PHC pipe piles 2 are installed section by section, and the upper and lower adjacent PHC pipe piles 2 are firmly welded along the connecting piles.
[0031] After the cement-soil mixing pile is formed, the PHC pile 2 is pressed into the cement-mixing pile 9 by static pressure. The pile position of the PHC pile 2 should be re-measured before static pressure; a steel protective sleeve should be added to the pile head, and a rubber pad should be installed inside the sleeve to prevent damage to the pile head and the grouting pipe 3 during the pressing process.
[0032] When the static pile driver is in place to drive piles, use the guide pile driving frame as a reference, align the plumb bob with the pile position, and adjust the verticality of the pile body; then put the sling on the pile end, transport it to the front of the pile driver with the pile driver's own boom, and feed it into the pile driver's clamp, align it with the pile position to drive 5 piles, first lightly press to adjust the verticality of the pile body to a certain depth in the soil, and then press it steadily and quickly. During the pile driving process, the verticality of the pile body must be strictly controlled.
[0033] When there is about 50cm left in the first section of the pile, stop pressing it in and connect the piles. Before connecting the piles, first fix the grouting pipe 3 in the PHC pile 2, use a crane to adjust it to the pile position, then untie the grouting pipe 3 and hang the PHC pile 2 to a certain height, leaving space for welding the grouting pipe 3, and weld the grouting pipe 3. The welding should be tight to prevent leakage in the later stage. After welding, slowly lower the PHC pile 2, use the positioning plate to align the upper and lower sections of the pile, and then carry out the welding work. The carbon dioxide welding method is used for welding. No cooling is required and pressure can be continued after the welding is completed. After the welding is qualified, continue to press the pile. After the pile connection is completed, continue to press the pile to the designed elevation, and use the pile top sealing plate 1 to seal the pile top. The grouting steel pipe should pass through a part of the pile top sealing plate 1. The grouting steel pipe should be plugged with a rubber plug to prevent soil from entering and blocking the grouting pipe 3.
[0034] In the specific implementation process, the PHC pile 2 equipped with the 3-way grouting pipe system is pressed into the cement mixing pile 9 section by section by static pressure. The 3-way grouting pipe system is to add a Φ50mm steel pipe as the grouting pipe 3 in the center of the PHC pile 2. The upper and lower ends of the grouting pipe 3 and the bottom and top of the PHC pile 2 and the sealing plate of the center opening are firmly welded, and a PVC waterproof geotextile bag 6 of the designed pile length (1 / 5-1 / 4) is placed on the bottom of the PHC pile 2, and the upper end of the bag opening is fixed to the pile with a clamp. After all the PHC pipe piles 2 are pressed into the cement mixing pile 9, a high-pressure grouting pump is used to inject cement 2 mortar with a water-cement ratio of 0.55-0.60 into the PVC waterproof geotextile bag 6 at the bottom of the pile through the grouting pipe 3 at the top of the pile. The waterproof geotextile bag continuously squeezes and expands the soil around the pile under the action of the high-pressure cement mortar. After hardening, a cement mortar consolidation body is formed around the bottom end of the PHC pipe pile 2, which increases the bite effect between the PHC pipe pile 2 and the surrounding soil, thereby greatly increasing the pile end bearing capacity and the pull-out resistance of the pipe pile.
[0035] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A PHC grouting and bottom-enlarged pile, characterized in that: Including pile top cover plate; PHC pile, grouting pipe, PVC waterproof geotextile bag, pile bottom cover plate, cement mortar expansion head; The PHC pipe pile is driven into the cement soil pile at a high pressure along the pile top design mark, a pile top sealing plate and a pile bottom sealing plate are respectively arranged at the top and bottom of the PHC pipe pile, a pile hole is opened in the center of the pile top sealing plate and the pile bottom sealing plate, a grouting pipe is installed inside the center of the PHC pipe pile, the top of the grouting pipe is connected to the pile hole of the pile top sealing plate, and the bottom of the grouting pipe is connected to the pile hole of the pile bottom sealing plate; The bottom of the PHC pipe pile is sleeved with a PVC waterproof geotextile bag, and a sleeve hoop is used to lock the PHC pipe pile along the opening of the PVC waterproof geotextile bag.
2. The PHC grouting and bottom-enlarged pile according to claim 1 is characterized in that: The PHC pipe piles are installed section by section, and upper and lower adjacent PHC pipe piles are firmly welded along the connecting piles.
3. The PHC grouting and bottom-enlarged pile according to claim 1 or 2, characterized in that: The pile top sealing plate is provided with a pile top exhaust hole.