Fabricated composite foundation structure with combined application of precast pile body and grinding pile cap
The assembled composite foundation structure of prefabricated piles and milled pile caps solves the problems of complex construction and poor environmental protection in the existing technology, and achieves fast, environmentally friendly and efficient foundation treatment.
Patent Information
- Application Number
- CN202422636762.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing deep composite foundation treatment methods have problems such as complex construction process, long construction period, and poor environmental protection effects on the stratum water, soil and surrounding environment.
The assembled composite foundation structure adopts prefabricated piles and milled pile caps. The components are prefabricated in the factory and installed on site, avoiding on-site pouring and mud preparation. The anchor bar modules and grouting materials are used to connect them to form a high-strength composite foundation.
It achieves fast, dust-free and noise-free construction, improves foundation treatment quality and construction efficiency, reduces environmental pollution, shortens construction period and reduces costs.
Smart Images
Figure CN223446136U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model belongs to the ground treatment technical field, more particularly, relate to a kind of prefabricated pile body and the assembly type composite foundation structure of joint application of profiled pile cap. BACKGROUND
[0002] In soft soil foundation engineering, often need to carry out foundation reinforcement treatment, commonly used deep composite foundation treatment method has cement soil mixing pile, cement fly ash gravel pile (referred to as "CFG pile"), sand pile, rotary jet pile, all are conventional mature foundation treatment technology, and it is more widely used in municipal and housing construction engineering field.Cement mixing pile is to use cement as solidifying agent, is sprayed into soil and is fully stirred, and it is hard to form by physical and chemical reaction with soil, but there are also some defects in actual engineering that are difficult to solve:one is the problem of uneven stirring, which affects the quality of pile;Second, there is a serious phenomenon of returning ash, cement powder is sprayed on the ground, which affects the cement content of pile body;Three, cement slurry generated during construction affects the surface water and soil environment;Four, artificial pile head breaking is needed, and the construction period is also relatively long, usually, the construction time of a cement mixing pile is 30 minutes to 2 hours, and it becomes a pile after 28 days, so a cement mixing pile foundation treatment construction needs to be completed for several months.CFG pile is to pour cement, fly ash and gravel mixture into foundation pile hole, and dense pile body is formed after aging, which also has obvious defects:one is that pile hole making is easy to collapse, and the quality of pile is easily affected by underground water, pipe pulling speed and other factors, and problems such as broken pile, reduced diameter pile and hanging pile are prone to occur;Second, the construction period is long, and it takes 30 to 50 minutes to prepare one CFG pile (20 to 30 piles per day), and it also needs to be maintained for 28 days before it becomes a pile;Three, the construction environment is seriously polluted, and the noise of vibration forming;Four, the workload of breaking pile head is large, and many construction wastes are generated after breaking, which is not environmentally friendly.Sand pile is similar to CFG pile, which is to extrude sand or sand and gravel into foundation pile hole to form a large-diameter dense pile body, which also has some shortcomings:one is that vibration or hammering of vibration machine will produce relatively large noise;Second, pipe pulling process is also prone to necking and broken pile;Three, the construction process is complicated, the construction period is long, and the pile forming time is about 4 to 8 hours.Rotary jet pile is to inject high-pressure slurry into soil, and the drill pipe is rotated and lifted at the same time, so that the slurry is mixed with soil to form a columnar solidified body, and the defects of this treatment technology are:one is that the slurry injection easily pollutes the surrounding water and soil environment, and it is not suitable for some special soils that cannot be sprayed with slurry, and dust pollution in air is caused during transportation and handling;Second, the required equipment and tools are relatively expensive, the construction process and technical difficulty are high, the technical level and experience of construction personnel are required, and the construction cost is relatively high;Three, the construction efficiency is not high, and the construction speed of rotary jet pile is generally between 2.5 meters / hour and 4 meters / hour, and only more than 50 meters can be constructed per day.
[0003] Through technical analysis on common deep composite foundation treatment methods, they have common characteristics of complex construction process, long pile forming period, and poor environmental protection effect on stratum water and soil and surrounding environment. Practical new type content
[0004] In view of the above defects or improvement needs of the prior art, the utility model provides a prefabricated pipe (square) pile assembly type composite foundation treatment new technology, which has a short construction period, and the whole construction is basically free of site pouring, mud preparation, dust raising, noise, all main components are prefabricated in the factory and installed on site, the assembly rate is high, and it is a green construction engineering technology, which can be used as a replacement scheme of the conventional composite foundation treatment method.
[0005] In addition, the composite foundation treatment technology provided by the patent has the characteristics of high assembly, can play the unique advantages of safety, convenience, efficiency, environmental protection and green, has a wider engineering application range and higher comprehensive time value.
[0006] In order to achieve the above purpose, the utility model relates to a prefabricated pile body and a profiled pile cap combined application assembly type composite foundation structure, comprising:
[0007] The pile sinking module comprises a prefabricated pile body with a hollow structure, a steel reinforcement cage assembly and a core concrete; the steel reinforcement cage assembly is arranged in the cavity of the hollow structure of the prefabricated pile body, and the core concrete is poured into the cavity of the hollow structure;
[0008] The profiled pile cap module is a block member with a stone mill outer shape structure, and the profiled pile cap module is provided with a bottom groove, a top groove, a horizontally arranged embedded reinforcement groove in communication with the top groove and a vertically arranged reinforcement penetrating hole for connecting the bottom groove and the top groove in the middle part; the bottom groove is a groove type structure recessed inward on the bottom surface of the profiled pile cap module, and is used for embedding the top part of the prefabricated pile body in the pile sinking module; the top groove is a groove type structure recessed inward on the top surface of the profiled pile cap module, and is used for cooperating with the embedded reinforcement groove to embed the anchor reinforcement in the anchor reinforcement module; the diameter of the connection part of the reinforcement penetrating hole and the bottom groove is locally enlarged to form an enlarged head;
[0009] The anchor reinforcement module comprises anchor reinforcements arranged vertically and fixedly on the top part of the prefabricated pile body, and the anchor reinforcements are arranged in a radial manner and are spaced apart from the core longitudinal reinforcement of the prefabricated pile body
[0010] In the precast pile body pre-provided anchor, then the anchor is inserted from the enlarged head of the hole, and the anchor is stretched out from the top groove, so that the bottom groove of the profiled pile cap module is embedded in the top end of the precast pile body. Then the stretched section of the anchor is horizontally bent and pressed into the embedded bar groove. Grouting material is poured into the top groove and the embedded bar groove and the hole, and is filled and smoothed to seal. After inspection, the bedding course is laid on the top of the profiled pile cap module to form the new composite foundation of the assembled type.
[0011] Further, the steel reinforcement cage assembly comprises core longitudinal reinforcement, a support plate and core stirrup; the top of the core longitudinal reinforcement is horizontally bent to be radially and uniformly distributed and is double-sided lap welded and fixed with the end plate provided at the top of the precast pile body; and the core concrete is poured at the internal cavity of the precast pile body.
[0012] Further, the core concrete is poured after the double-sided lap welding and fixing of the core longitudinal reinforcement and the end plate, and the internal wall of the precast pile body is cleaned before pouring, and the internal wall is brushed with cement slurry, concrete interface agent or micro-expanding concrete.
[0013] Further, the embedded bar groove has a plurality of embedded bar grooves, which are connected with the top groove and radially and uniformly arranged at the edge of the top groove.
[0014] Further, the diameter Bd of the bottom groove is greater than the diameter Zd of the precast pile body, and Bd is not less than (Zd+50) mm; the depth Bt of the bottom groove is not less than 50 mm, and the depth Bt of the bottom groove is not less than 100 mm for a large-diameter pile body.
[0015] Further, the diameter Td of the top groove meets the bending requirement of the anchor, and Td is not less than (Zd+100) mm; the depth Tt of the top groove meets the embedding requirement of the anchor, and Tt is not less than Zd+2c, c being the thickness of the concrete protective layer.
[0016] Further, the depth of the embedded bar groove is consistent with the depth Tt of the top groove; the width Tb of the embedded bar groove is not less than the diameter d of the anchor plus 2c, c being the thickness of the concrete protective layer; the length Te of the embedded bar groove meets the embedding requirement of the horizontally bent part of the anchor; the position and number of the embedded bar groove correspond to and are consistent with the hole.
[0017] Further, the diameter Cd of the hole is not less than the diameter d of the anchor plus 10 mm.
[0018] Further, the profiled pile cap module is a block member precast in a factory by using reinforced concrete, and has a circular appearance or a square appearance.
[0019] Further, the anchor module further comprises no less than two anchor plates symmetrically and fixedly arranged at the bottom end of the anchor; and the anchor plates are double-sided welded and fixed with the end plate at the top of the precast pile body.
[0020] Further, the enlarged head diameter and height are consistent with the horizontal width Mb and vertical height Mh of the end anchor plate of the anchor bar.
[0021] Further, after the module assembly is completed, grouting material is grouted in the top groove, the embedded bar groove and the embedded bar hole, the grouting material is high-strength grade premixed cement mortar or grouting material; after inspection, a cushion layer is laid on the top of the pile cap.
[0022] Overall, compared with the prior art, the above technical scheme conceived by the utility model can achieve the following beneficial effects:
[0023] (1) The prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model can strictly control the quality in the production process, ensure the size accuracy and strength performance indicators of the components, and reduce construction defects.
[0024] (2) The prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model can improve the structural strength, significantly shorten the construction period, avoid cumbersome procedures such as on-site pouring and mud preparation and related pollution, realize dust-free and noise-free construction, improve the construction efficiency, save time and cost for engineering construction. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0026] Figure 2 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0027] Figure 3 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0028] Figure 4 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0029] Figure 5 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0030] Figure 6 The structure schematic view of the prefabricated pile body and the profiled pile cap combined application assembly type composite foundation structure of the utility model embodiment preferred embodiment is shown in the figure.
[0031] Figure 7 The structural schematic view of the anchor bar module of the preferred embodiment of the utility model;
[0032] Figure 8 The structural schematic view of the anchor bar module and the pile sinking module of the preferred embodiment of the utility model;
[0033] Figure 9 The structural plan view of the anchor bar module and the pile sinking module of the preferred embodiment of the utility model;
[0034] 1-pile sinking module, 11-precast pile body, 111-end plate, 12-reinforcing cage assembly, 121-core longitudinal reinforcement, 122-supporting plate, 123-core stirrup, 13-core concrete, 2-profiled pile cap module, 21-bottom groove, 22-top groove, 23-embedded reinforcement groove, 24-reinforcement hole, 241-enlarged head, 3-anchor bar module, 31-anchor bar, 32-anchor plate, 4-filling material, 5-mattress layer. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.
[0036] The embodiment of the application relates to a fabricated composite foundation structure of precast pile body and profiled pile cap combined application, comprising:
[0037] Please refer to Figures 1-3 The core filling part at the top of the pile is as follows:
[0038] 1, pile sinking: according to the specified position of the project, the precast pipe pile or hollow square pile required by the project is sunk into the foundation by the way of static pressure or hammering (if the environment is acceptable), the top of the pile reaches the required elevation of the project, and the selection of the precast pile is determined according to the engineering technical requirements.
[0039] 2, core filling: the core longitudinal reinforcement is welded and fixed with the supporting plate, then the core stirrup is uniformly wound along the core longitudinal reinforcement at equal intervals, the core longitudinal reinforcement, the supporting plate and the core stirrup are sunk into the cavity of the precast pipe pile or hollow square pile as a whole, the sinking depth Tc is determined according to the engineering requirements. The top of the core longitudinal reinforcement is horizontally bent and double-face lap-welded with the end plate at the top of the pile. Then the core concrete is poured into the pile hole and vibrated and compacted.
[0040] Before pouring the core filling concrete, the inner wall of the pile should be cleaned, and the inner wall should be coated with cement paste, concrete interface agent or micro-expansion concrete.
[0041] In some preferred embodiments, higher-strength, more durable and lighter-weight materials are used to make the prefabricated pile body, such as high-performance fiber-reinforced composites and the like. Such materials can reduce the self-weight of the pile body, facilitate transportation and construction, while improving the carrying capacity and corrosion resistance of the pile body, and prolonging the service life of the composite foundation. Meanwhile, in some other preferred embodiments, the mix proportion of the concrete prefabricated pile body is further optimized, and high-efficiency water-reducing agents, mineral admixtures and other additives are added to improve the workability, strength and crack resistance of the concrete. By reducing the cement content and hydration heat, the risk of cracks in the concrete during construction and use is reduced.
[0042] Please refer to Figures 4-6 The manufacturing process of the shaped pile cap is as follows:
[0043] The shaped pile cap is the innovation point of the present patent. The shaped pile cap is a special block member with a unique shape similar to a stone mill, which is prefabricated by reinforced concrete in a factory. The shape can be round or square, depending on the actual engineering requirements. The present patent takes the round shape as an example for illustration, and the technical requirements included are also applicable to the square pile cap. The peripheral size Md and the thickness Mt of the shaped pile cap are determined by the specific engineering technical requirements. A bottom groove, a top groove, a reinforcement embedding groove and a reinforcement penetrating hole are arranged in the middle of the shaped pile cap.
[0044] The bottom groove: used for embedding the pile top to provide resistance to the pile top, the diameter Bd is slightly larger than the diameter Zd of the prefabricated pipe pile, Bd=(Zd+50)mm, and the depth Bt is not less than 50mm (not less than 50mm for medium diameter pile, not less than 100mm for large diameter pile).
[0045] The top groove: used for embedding the anchor bar, the diameter Td meets the bending requirement of the anchor bar, Td not less than (Zd+100)mm, and the depth Tt meets the embedding requirement of the anchor bar, Tt=d+2c (where c is the thickness of the concrete cover).
[0046] The reinforcement embedding groove: connected with the top groove, and arranged in a radial manner. The depth of the reinforcement embedding groove is the same as the depth Tt of the top groove, the width Tb meets the embedding requirement of the anchor, Tb=d+2c (where c is the thickness of the concrete cover), and the length Te meets the anchoring length requirement of the anchor bar, which is determined by the specific engineering requirements. The position and number of the reinforcement embedding groove are consistent with those of the reinforcement penetrating hole.
[0047] Punching hole: the bottom groove and the top groove are provided with a punching hole. The punching hole vertically penetrates up and down, and its diameter Cd is the diameter d of the anchor bar plus 10 mm. At a certain height where the punching hole connects with the bottom groove, the diameter of the punching hole is locally enlarged to form an enlarged head, and the diameter and height of the enlarged head are consistent with Mb and Mh of the end head anchor plate of the anchor bar.
[0048] In some preferred embodiments, fiber materials such as steel fibers, glass fibers, etc. are added to the pile cap concrete to enhance the tensile strength and toughness of the concrete, prevent cracking and breaking of the pile cap when subjected to external forces, and improve the impact resistance of the pile cap and the seismic resistance of the composite foundation.
[0049] Please refer to Figures 7-9 Pile top anchor bar manufacturing and installation part as follows:
[0050] 1. Anchor bar manufacturing: symmetrically weld two anchor plates on both sides of one end of the anchor bar, keep the anchor bar vertical, and the length Mc is appropriate according to engineering needs, the height Mh of the anchor plate is not less than (5d+20) mm, d is the diameter of the anchor bar, the width Mb of the anchor plate is not less than 50 mm, and the anchor plate is connected and fixed with the anchor bar by double-sided welding to form a whole.
[0051] 2. Anchor bar installation: double-sided weld the end head anchor plate of the anchor bar already manufactured with the end plate of the pile top, and the position is spaced from the bent core bar of the pile top. In order to avoid the bending of the anchor bar affecting the installation of the profiled pile cap in the next process, the appearance quality of the anchor bar should be protected, and this process is installed on site.
[0052] 3. Site construction and installation part as follows:
[0053] Transport the profiled pile cap manufactured in the factory to the designated position of the project. First, check that the pile top end plate and anchor bar are free of dust, oil stains, rust stains, debris, organic impurities, etc., and keep them clean, flat and straight. Then lift a profiled pile cap, let the anchor bar previously set on the pile top pass through the enlarged head of the punching hole and extend from the top groove, so that the bottom groove of the profiled pile cap is embedded in place with the pile top. Then bend the extended section of the anchor bar horizontally and press it into the embedded bar groove.
[0054] Pour premixed cement mortar or grouting material of a higher strength grade than the pile cap into the top groove, embedded bar groove and punching hole, fill and smooth to seal, and maintain to the age period. Install the profiled pile cap of other pile positions in this way, and after completion and inspection, lay the cushion layer on the top of the pile cap to form the assembled new composite foundation described in the patent.
[0055] In some preferred embodiments, for the shape of the pile, in addition to the existing square or circular pile, other shapes of the pile can be used, such as an oval shape, a polygonal shape, etc., so as to increase the contact area and friction between the pile and the soil and to enhance the bearing capacity of the pile. Meanwhile, structures such as protrusions, grooves or patterns are arranged on the surface of the pile, so as to increase the mechanical interlocking effect between the pile and the surrounding soil and to improve the side friction and uplift resistance of the pile. This surface treatment method can effectively improve the bearing performance of the composite foundation and reduce the settlement and displacement of the pile.
[0056] In some preferred embodiments, a monitoring system is arranged, various sensors such as strain sensors, displacement sensors, pressure sensors, etc. are installed in the composite foundation structure, and the stress state, deformation condition and pile-soil interaction of the composite foundation are monitored in real time. Through the analysis and processing of the monitoring data, the working state of the composite foundation can be understood in time, and the safe operation of the project is ensured.
[0057] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An assembled composite foundation structure using a prefabricated pile body and a milled pile cap, characterized in that: include: A pile driving module (1) comprises a prefabricated pile body (11) with a hollow structure, a steel cage assembly (12) and core-filling concrete (13); the steel cage assembly (12) is arranged in the cavity of the hollow structure of the prefabricated pile body (11), and the core-filling concrete (13) is poured into the cavity of the hollow structure; A mill-shaped pile cap module (2) is a block component with a millstone appearance structure. A bottom groove (21), a top groove (22), a horizontally arranged embedded reinforcement groove (23) communicating with the top groove, and a vertically arranged through-rebar hole (24) for communicating with the bottom groove and the top groove are provided in the middle of the mill-shaped pile cap module (2); the bottom groove (21) is a groove-shaped structure provided on the bottom surface of the mill-shaped pile cap module and recessed inwardly, and is used to embed the top of the prefabricated pile body (11) in the pile driving module (1); the top groove (22) is a groove-shaped structure provided on the top surface of the mill-shaped pile cap module and recessed inwardly, and is used to cooperate with the embedded reinforcement groove to embed the anchor reinforcement (31) in the anchor reinforcement module (3); the diameter of the through-rebar hole (24) is partially enlarged at the junction with the bottom groove (21) to form an enlarged head (241); An anchor bar module (3), the anchor bar module (3) includes anchor bars (31) vertically fixedly arranged on the top of the precast pile body (11), the anchor bar installation position is spaced apart from the bent core filling longitudinal bars (121) of the precast pile body (11) and is distributed in a radial shape.
2. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The steel cage assembly (12) comprises core-filling longitudinal reinforcement (121), a supporting plate (122) and core-filling stirrups (123); the top of the core-filling longitudinal reinforcement (121) is horizontally bent and evenly distributed in a radial shape and is welded and fixed to the end plate (111) provided on the top of the precast pile body (11) on both sides by overlapping, and the core-filling concrete (13) is poured into the inner cavity of the precast pile body (11).
3. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: There are a plurality of rib embedding grooves (23), which are connected to the top groove (22) and are evenly arranged radially on the edge of the top groove (22).
4. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The diameter Bd of the bottom groove (21) is greater than the diameter Zd of the prefabricated pile body (11), and Bd is not less than (Zd+50) mm; the depth Bt of the bottom groove (21) is not less than 50 mm.
5. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The diameter Td of the top groove (22) meets the bending requirement of the anchor bar (31), and Td is not less than (Zd+100) mm; the depth of the top groove (22) meets the embedding requirement of the anchor bar (31), and Tt is not less than Zd+2c, where c is the thickness of the concrete protective layer.
6. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The depth of the embedded reinforcement groove (23) is consistent with the depth Tt of the top groove (22); the width Tb of the embedded reinforcement groove (23) is not less than the diameter d+2c of the anchor bar (31), where c is the thickness of the concrete protective layer; the length Te of the embedded reinforcement groove (23) is sufficient to embed the horizontal part of the anchor bar (31) after bending; the position and number of the embedded reinforcement groove (23) correspond to and are consistent with the reinforcement through-hole (24).
7. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The diameter Cd of the reinforcement hole (24) is not less than the diameter d+10 mm of the anchor reinforcement (31).
8. The prefabricated composite foundation structure in which a prefabricated pile body and a milled pile cap are used in combination according to claim 1, characterized in that: The mill-shaped pile cap module (2) is a block component prefabricated in a factory using reinforced concrete and has a circular or square appearance.
9. The assembled composite foundation structure comprising a prefabricated pile body and a milled pile cap according to any one of claims 1 to 8, characterized in that: The anchor bar module (3) further comprises at least two anchor plates (32) symmetrically fixedly arranged on both sides of the bottom end of the anchor bar.
10. The prefabricated composite foundation structure in combination with a prefabricated pile body and a milled pile cap according to claim 9, characterized in that: The diameter and height of the enlarged head (241) are consistent with the horizontal width Mb and vertical height Mh of the end anchor plate (32) of the anchor bar (31).