CN210117711U - Prefabricated tubbiness foundation structure is implanted to cyclic annular stirring grooving back of major diameter and construction equipment thereof - Google Patents

Abstract

The utility model discloses a implant prefabricated tubbiness foundation structure and construction equipment behind cyclic annular stirring grooving of major diameter belongs to ground basis field. The foundation structure comprises a plurality of cement stirring piles and a large-diameter prefabricated circular tubular pile. All cement mixing piles are arranged on the ground level along a circular ring shape, and adjacent cement mixing piles are mutually engaged and connected, so that circular soft underground continuous grooves which are connected end to end can be formed before cement is not completely solidified; a prefabricated circular tubular pile made of concrete is inserted into the underground continuous groove vertically on the ground; the inner and outer side walls of the prefabricated circular pipe pile are tightly combined with the stirring pile by filling cement, and a closed integral waterproof barrel-shaped foundation is formed after cement is solidified. The utility model discloses still improve current stirring stake machine, the stirring drilling agitating unit after the improvement can form the annular soft underground continuous groove of major diameter in the soft soil foundation. The utility model discloses a foundation structure can exert the bearing effect of the closed within range soil body very greatly, has compensatied the defect that traditional precast tubular pile diameter is little, the bearing capacity is low, simultaneously because the cross-sectional area is great, has better anti-seismic performance for single pile basis.

Description

Prefabricated tubbiness foundation structure is implanted to cyclic annular stirring grooving back of major diameter and construction equipment thereof

Technical Field

The utility model belongs to ground foundation field, concretely relates to implant prefabricated tubbiness foundation structure behind the cyclic annular stirring grooving of major diameter and construction equipment thereof.

Background

Two of the two most widely used pile foundations in the construction industry are the precast tubular pile and the cast-in-place bored pile. Wherein, the prefabricated pipe pile foundation diameter is less, and single pile bearing capacity is lower, generally in 400 sand-plus-500 KN scope, and the prefabricated pipe pile of major diameter is more highly required and is less common because of the construction equipment. In order to improve the bearing capacity of the prefabricated tubular pile foundation, the driving depth of the tubular pile has to be increased, so that the problems that the pile is not easy to press and break, huge construction noise is generated during driving and the like are caused. The diameter of the cast-in-situ bored pile is larger, the bearing capacity is higher, generally in the range of 1000-2000KN, but the construction period is longer, the construction cost is high, the construction quality is not easy to control, and the problems of segregation, necking down, thick sediment at the bottom of the pile and the like are easy to occur during the concrete cast-in-situ. Therefore, the two common pile types at present are not easy to meet the requirements of large diameter and high bearing capacity, and have certain defects respectively.

All drill rods of the existing single (three) shaft mixing pile machine are driving drill rods (driving shafts), namely, when the drill rods are directly connected with a motor to drill weak foundation soil, only a single circular groove with a smaller diameter can be drilled, and an annular soil groove with a large diameter cannot be formed, so that the application of the existing single (three) shaft mixing pile machine has certain limitation.

Therefore, by combining the characteristics of the existing pile foundation, a large-diameter annular prefabricated barrel-shaped foundation and a construction method are designed, the barrel-shaped foundation with the large diameter and the high bearing capacity can be realized, and the following three aspects can be considered:

firstly, in order to improve the bearing capacity of the foundation, the interaction between the foundation and the foundation soil needs to be improved, and the bearing effect of the soil body is exerted as much as possible, so that the bearing capacity of the foundation is improved on the premise of not increasing building materials. In the conventional pile foundation, the bearing effect exerted by soil between piles is extremely limited, the main reason is that the soil body is easy to laterally deform under extrusion, and if the soil body can be sealed inside the foundation, the bearing effect of the soil between piles is greatly improved, and meanwhile, the settlement of the soil body is reduced.

Second, major diameter precast tubular pile is generally difficult to beat (press) into the ground because the resistance of beating the in-process and receiving is too big, if can beat the foundation before establishing at the pile foundation and carry out the preliminary treatment, form soft border, will have the work progress that does benefit to the prefabricated pile foundation of major diameter.

Thirdly, the single-shaft stirring pile machine or the three-shaft stirring pile machine can be used for preprocessing the foundation soil body, can stir the foundation soil body to be soft, can spray cement at the same time, is mixed with the soil body, and can improve the anti-permeability performance and the bearing performance of the soil body. However, neither can form a dimensionally specific soft boundary. By means of adding the drill bit, the existing single-shaft stirring pile machine is properly improved, and the annular soil groove with the large diameter can be generated.

Disclosure of Invention

In consideration of the fact that the bearing effect of foundation soil is not sufficiently played, the integral bearing capacity of the foundation can be improved through a closed soil body, and a large-diameter annular closed barrel-shaped foundation is designed; meanwhile, in consideration of the fact that the large-diameter foundation is not easy to enter a foundation soil body, a construction device and a construction method for generating an annular closed soft soil boundary are designed. The utility model aims at solving the defects of insufficient bearing capacity and inconvenient construction of the existing foundation base and providing a stirring grooving insertion type prefabricated combined box foundation structure.

The utility model provides a technical scheme that concrete technical problem adopted is:

a prefabricated barrel-shaped foundation structure is implanted after large-diameter annular stirring is carried out to form a groove, and the prefabricated barrel-shaped foundation structure comprises a plurality of stirring piles embedded into a foundation, wherein all the stirring piles are arranged on the ground plane along an annular shape, and adjacent stirring piles are mutually meshed and connected to form an annular underground continuous groove structure connected end to end; a prefabricated circular tubular pile made of concrete is inserted into the vertical ground in the underground continuous groove structure, the inner diameter of the prefabricated circular tubular pile is larger than that of the underground continuous groove structure, and the outer diameter of the prefabricated circular tubular pile is smaller than that of the underground continuous groove structure; the inner and outer side walls of the prefabricated circular tubular pile are tightly combined with the boundary of the stirring pile through filling cement soil.

The utility model provides a prefabricated ring shape tubular pile indicates the tubular pile of making in the mill in advance, and the cross section of tubular pile is ring shape.

Preferably, prefabricated ring shape tubular pile divide the assembled tubular pile by the components of a whole that can function independently that a plurality of precast concrete arc components make up and form, every precast concrete arc component's one end is equipped with strip rectangle protrudingly, the other end be equipped with can with the protruding complex strip recess of strip rectangle, a plurality of precast concrete arc components interlock in order forms end to end's closed annular pile body.

Preferably, prefabricated ring shape tubular pile have a plurality ofly, each one end of prefabricated ring shape tubular pile be equipped with annular protrusion, the other end be equipped with can with annular protrusion complex annular groove, a plurality of prefabricated ring shape tubular piles superpose the connection in order in the direction of height.

Another object of the present invention is to provide a device for forming a ring-shaped stirring trough, which comprises a driving drill rod, a drill bit, a ring-shaped disc and a driven drill rod; the driving drill rod and the driven drill rod are uniformly distributed along the circumferential direction of the disc body of the annular disc, and a drill bit is arranged at the bottom of each driving drill rod and the bottom of each driven drill rod; two drill bits at the bottoms of any two adjacent drill rods are arranged in a staggered manner in the height direction, and the drilling ranges of the two drill bits are partially occluded in the projection direction; each driving drill rod is in transmission connection with an output shaft of the motor, each driven drill rod is installed on the annular disc through a bearing, the driven drill rods and the driving drill rods form matched transmission through transmission parts, and the driving drill rods drive the rest driven drill rods to synchronously rotate.

The annular stirring grooving device can be used for manufacturing the annular underground continuous groove structure which is embedded into the prefabricated barrel-shaped foundation structure after the large-diameter annular stirring grooving is carried out.

Preferably, the driving drill rod is sleeved with a sleeve, and the motor is mounted on the fixed support.

Preferably, the transmission member is a gear or a chain.

Preferably, the drill bit is detachably mounted at the bottom of the driving drill rod and the driven drill rod.

Preferably, the driving drill rods are preferably a plurality of driving drill rods not less than 2, the driving drill rods are uniformly distributed along the circumferential direction of the disc body of the annular disc, and the number of driven drill rods driven by each driving drill rod is the same.

The utility model has the advantages as follows:

1. the utility model can form a large-diameter barrel-shaped foundation, and has larger transverse rigidity compared with a single pile foundation, thereby improving the horizontal bearing capacity of the foundation; for the pile group basis, the utility model provides high basic overall stability and anti-seismic performance.

2. The utility model discloses stir stake machine to traditional list (three) axle and improve, increased drill bit quantity, can drill out the cyclic annular soil box of major diameter in the ground, increase the range of application of stirring stake machine.

3. The utility model discloses the bearing effect of the closed soil body in can the full play ground to reduce the concrete volume, greatly improve the vertical bearing capacity of basis, reduce the ground and subside.

4. The utility model discloses compare with concrete entity tubular pile, can not only increase the area of contact of basis and the soil body, cement has the reinforcement effect to basis-soil contact interface moreover, improves basic bottom bearing capacity coefficient simultaneously, and the bearing effect of the closed soil body of very big performance makes the vertical bearing capacity of novel basis greatly improve. Therefore, under the condition that the same bearing capacity required, the utility model discloses required concrete volume significantly reduces, more energy-concerving and environment-protective.

5. The utility model has simple construction mode, the concrete member can be prefabricated in factory, and the manufacture is convenient; the main construction device can be formed by improving the traditional mixing pile machine, the technology of mixing cement soil into a groove is mature, and the construction difficulty is small.

Drawings

FIG. 1 is a schematic view of a large diameter ring-shaped base structure embedded in a prefabricated bucket after being stirred into a tank;

FIG. 2 is a schematic view of an integrally formed prefabricated circular tubular pile;

FIG. 3 is a schematic view of a split assembly type prefabricated circular tubular pile;

FIG. 4 is a schematic view of a prefabricated annular tubular pile integrally formed in the longitudinal direction;

FIG. 5 is a schematic view of a prefabricated circular tubular pile assembled in longitudinal sections;

FIG. 6 is a schematic structural view of an annular stirring and tank-forming device;

FIG. 7 is a schematic structural view of an annular disc assembled by 4 split structures (four-axis drive and transmission);

FIG. 8 is a schematic view of a transmission structure formed by 20 drill rods in the embodiment;

FIG. 9 is a schematic view of the construction of a prefabricated barrel-shaped foundation structure implanted after a large-diameter annular stirring tank is formed.

In the figure: the device comprises a precast concrete arc-shaped component 1, a precast circular tubular pile 2, a strip-shaped rectangular protrusion 3, a strip-shaped groove 4, an annular protrusion 5, an annular groove 6, an annular stirring grooving device 7, a motor 8, a driving drill rod 9, a drill bit 10, a transmission part 11, a bearing 12, a sleeve 13, an annular disc 14, a driven drill rod 15, a fixed support 16, a driving drill rod 17 of a split structure, a driven drill rod 18 of a split structure and a stirring pile 19.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and implementation steps.

The utility model designs a large-diameter annular precast concrete barrel-shaped foundation, which seals the soil body in the annular foundation and can greatly play the bearing role of the soil body; meanwhile, the cross section area of the foundation is increased by utilizing the closed soil body, so that the contact area between the side surface of the foundation and the soil body is enlarged, and the bearing capacity of the foundation is further increased. In the aspect of construction machinery, a traditional mixing pile machine is improved, and a circle of soft annular closed boundary which is easy to insert into a prefabricated foundation component can be formed. In addition, in order to increase the friction force of the foundation-soil body interface, cement is sprayed simultaneously in the process of stirring the soil body by the equipment, a cement-soil interface with better bearing effect is formed in the range of the foundation-soil body contact interface, and finally a concrete bearing platform is poured to form a composite foundation with prefabricated pipe pieces, a closed soil body and cement-soil for bearing the upper building structure. The following further explains the concrete three aspects of the foundation structure, the construction device and the construction method.

As shown in fig. 1, the major structure of the prefabricated barrel-shaped foundation structure implanted after the large-diameter annular stirring tank is formed in this embodiment includes a plurality of stirring piles 19 embedded in the foundation, the stirring piles 19 can be formed by rotating and spraying a stirring device such as a single (three) -shaft stirring pile machine on the foundation, and each stirring pile 19 is in a circular pile shape. From the ground plane perspective, all the mixing piles 19 are arranged along a circular ring shape on the ground plane, the adjacent mixing piles 19 are mutually occluded and connected, and the adjacent pile body parts are communicated to form a circular soft underground continuous groove structure which is connected end to end. When the stirring equipment stirs the foundation soil body, the cement can be sprayed in the soil by using the grout spraying port at the bottom of the drill bit, so that the cement and the original foundation soil are uniformly mixed to form cement soil with better impermeability and stronger cohesive force. Can be equivalent to before cement is not totally solidified and formed the round ring shape, easily insert the closed boundary of concrete prefabricated component, the soft foundation soil on this boundary is sealed by cement, forms the waterproof tubbiness basis of confined whole after the cement solidifies the utility model discloses an among the continuous groove structure in the underground, the prefabricated ring shape tubular pile 2 that the concrete was made is inserted to perpendicular ground, and the internal diameter of prefabricated ring shape tubular pile 2 is greater than the internal diameter of continuous groove structure in the underground, and the external diameter of prefabricated ring shape tubular pile 2 is less than the external diameter of continuous groove structure in the underground for prefabricated ring shape tubular pile 2 can be smooth insert in the continuous groove structure in the underground perpendicularly. Moreover, because a large amount of cement soil is arranged in the underground continuous groove structure, the size of the cross section of the prefabricated circular tubular pile 2 is smaller than that of the cross section of the underground continuous groove structure, a certain space is reserved between the inner side wall and the outer side wall of the prefabricated circular tubular pile 2 and the foundation soil on the boundary of the mixing pile 7, the space is filled with the cement soil, and the cement soil layer can be used as a transition layer to improve the contact relation between the foundation soil and the concrete integral structure. The top of the prefabricated circular tubular pile 2 can be poured with an upper structure such as a bearing platform and the like according to needs.

In the prefabricated barrel-shaped foundation structure, the soil body is sealed in the prefabricated circular tubular pile, so that the bearing effect of the soil body is greatly exerted; meanwhile, the cross section area of the foundation is increased by utilizing the closed soil body, so that the contact area between the side surface of the foundation and the soil body is enlarged, and the bearing capacity of the foundation is further increased. In addition, in order to increase the friction force of the foundation-soil body interface, cement is sprayed simultaneously in the process of stirring the soil body by the equipment, a cement-soil interface with better bearing effect is formed within the range of the foundation-soil body contact interface, and finally an upper structure is poured on the basis of the cement-soil interface, so that a composite foundation with the prefabricated circular tubular pile, the closed soil body and the cement soil for bearing the upper building structure together is formed.

In the prefabricated barrel-shaped foundation structure, if the size of the foundation is small, the prefabricated circular tubular pile 2 may be an integrally formed integrated member, as shown in fig. 2. However, if the size of the foundation is large and it is necessary to form a large-diameter annular structure, the integral forming process is difficult, and it is considered that a separate assembly type tubular pile as shown in fig. 3 is used. One section components of a whole that can function independently assembled tubular pile is formed by the combination of a plurality of precast concrete arc component 1, and the one end of every precast concrete arc component 1 is equipped with strip rectangle protrudingly 3, and the other end is equipped with can with the strip recess 4 of strip rectangle protrudingly 3 complex, and strip rectangle protrudingly 3 and strip recess 4 can form the tenon fourth of the twelve earthly branches cooperation. Therefore, the whole prefabricated circular tubular pile 2 is split into the plurality of prefabricated concrete arc-shaped members 1, the whole manufacturing difficulty can be reduced, and the cost is saved. After prefabrication of each precast concrete arc-shaped member 1 in a factory is finished, the precast concrete arc-shaped members can be transported to a construction site, then the precast concrete arc-shaped members are sequentially driven into a foundation to be assembled on the site, and the precast concrete arc-shaped members 1 are sequentially meshed to form a closed annular pile body connected end to end. After the cement soil is solidified, the performance of the integral forming member can be integrally exerted. Of course, the specific forming mode is determined according to the construction requirement, and the assembling and connecting structure of the arc-shaped component can be adjusted according to the requirement. Meanwhile, the gap between the strip-shaped rectangular protrusion 3 and the strip-shaped groove 4 can be filled by grouting, so that the connection is tighter, and a stable closed annular structure is finally formed.

Similarly, because the depth of the foundation is not fixed, when the depth of the foundation is shallow, the prefabricated circular tubular pile 2 can be directly prefabricated to a corresponding length, as shown in fig. 4. However, when the foundation depth is deep, the single prefabricated circular tubular pile 2 with long length is directly adopted, and the manufacturing and transportation costs are high, so that the multi-section splicing mode can be considered for assembly. As shown in fig. 5, namely, the prefabricated circular tubular pile 2 is divided into a plurality of sections, one end of each section of the prefabricated circular tubular pile 2 is provided with an annular protrusion 5, the other end of each section of the prefabricated circular tubular pile 2 is provided with an annular groove 6 capable of being matched with the annular protrusion 5, and the annular protrusion 5 can be inserted into the annular groove 6 to form a matching connection. After each prefabricated ring shape tubular pile 2 is prefabricated in the mill, can transport to the job site, then squeeze into in proper order and assemble in the scene in the basis, a plurality of prefabricated ring shape tubular piles 2 are through cyclic annular protruding 5 and cyclic annular recess 6 stack connection in order in the direction of height, and the total height after the connection satisfies the demands.

The prefabricated circular tubular pile 2 can be formed by casting concrete through a die with a specific size, and reinforcing steel bars can be added if needed, so that the anti-cracking capacity of a concrete member is improved.

At present, the large-diameter annular duct piece is widely applied to lining projects such as subways and tunnels, the technology is mature, but the large-diameter annular duct piece is not applied to the field of foundation foundations. Conventional single (many) axle stirring stake machine can only be one by one or a plurality of drilling, can't form annular drilling, and its efficiency is lower, and the pore-forming quality is difficult to control. Therefore the utility model discloses in, improve conventional single (many) axle stirring stake machine, designed multiaxis stirring stake machine, the main objective of improvement is in the ground drilling form the specific annular weak soil border of size, form one kind can directly drill out annular stirring grooving device 7 of ring channel. As shown in fig. 6, the annular stirring and grooving device 7 mainly comprises a driving drill rod 9, a drill 10, a motor 8, a transmission member 11, a bearing 12, a sleeve 13, an annular disc 14, a driven drill rod 15, a fixed bracket 16 and the like. The annular disc 14 is an annular disc body, and mounting holes are uniformly formed in the circumferential direction of the disc body. The driving drill rod 9 and the driven drill rod 15 are uniformly distributed along the circumferential direction of the disc body of the annular disc 14 and penetrate through the mounting hole for positioning. A drill bit 10 is mounted to the bottom of each of the kelly 9 and kelly 15. The drill bit 10 is preferably detachably mounted at the bottom of the driving drill rod 9 and the driven drill rod 15, so as to facilitate disassembly and maintenance. The drill 10 is provided with a grout spraying port communicated with a grouting device, and cement can be sprayed in soil by using a three-shaft stirring device while soil is stirred, so that the cement and original foundation soil are uniformly mixed to form cement soil with better impermeability and stronger cohesive force. It should be noted that the driving mode and the installation mode of the driving drill rod 9 and the driven drill rod 15 are different. Each driving drill rod 9 is in transmission connection with an output shaft of the motor 8, the motor 8 is installed on the fixed support 16, and the driving drill rods 9 are driven by the motor 8 to rotate and drive the drill bits 10 at the lower portions to drill holes in a rotating mode. The part of the kelly 9 extending out of the annular disc 14 is protected by a sleeve 13. And the driven drill rod 15 does not have a power motor per se, but needs to be driven by the driving drill rod 9. Each driven drill rod 15 is arranged in a mounting hole of the annular disc 14 through a bearing 12, the driven drill rods 15 and the driving drill rod 9 form matched transmission through a transmission part 11, and the driving drill rod 9 drives the other driven drill rods 15 to synchronously rotate. The transmission member 11 may be a gear, a chain, or the like, as long as the transmission between the two rods can be achieved. In addition, because prefabricated ring shape tubular pile 2 has certain thickness, this needs two adjacent drill bits 10 drilling range partially interlock in the projection direction, and the stirring stake that forms after forming the drilling also can interlock, and the thickness of interlock position can hold prefabricated ring shape tubular pile 2. In order to realize this requirement, the utility model designs a vertical length of adjacent drilling rod is different, and two drill bits 10 of two arbitrary adjacent drilling rod bottoms all are height dislocation arrangement in the direction of height, and two drill bits 10 drilling ranges are in projection direction part interlock. In this embodiment, the annular disk 14 is counted in one direction, the odd bits 10 are located above, and the even bits 10 are located at a certain distance below, so that the adjacent bits 10 do not collide with each other, but the drilling ranges thereof coincide. By the method, an underground continuous groove structure with a certain thickness can be guaranteed to be formed in the process of simultaneously drilling down all the drill rods.

In order to maintain the stability of the transmission, the driving drill rods 9 are preferably even and even distributed along the circumferential direction of the disc body of the annular disc 14, and the number of the driven drill rods 15 driven by each driving drill rod 9 is the same. In addition, if the diameter of the annular disc is small, the annular disc can be of an integral structure, but if the diameter of the annular disc is large, the annular disc can also be of a combined structure, that is, as shown in fig. 7 (the figure is only a top view of the drill rod and the disc, and the outline of the drill bit is omitted), a plurality of split structures (4 shown in the figure) are combined to form the annular disc, and each split structure in the figure is provided with 1 driving drill rod 17 with a split structure and 2 driven drill rods 18 with a split structure, so that the annular disc is convenient to split, construct and transport.

In the present embodiment, as shown in fig. 8, 20 drill rods are designed in the annular stirring tank-forming device 7, 4 of which are the main drill rods 9, and 20 stirring piles 19 can be formed at one time. The transmission part 11 of the device is realized by adopting gears, the gears are respectively arranged at equal height positions on the driving drill rod 9 and the driven drill rod 15, and the gears on two adjacent rods are meshed with each other.

Based on the annular stirring grooving device 7, the method for constructing the large-diameter annular stirring grooving device shown in fig. 1 by implanting the large-diameter annular stirring grooving device into the prefabricated barrel-shaped foundation structure comprises the following steps:

step 1, designing and pre-manufacturing a ring-shaped stirring grooving device 7 and a prefabricated ring-shaped tubular pile 2 with proper sizes according to a dot diagram shown in the left diagram of fig. 9. The prefabricated circular tubular pile 2 component is formed by casting concrete through a die with a specific size, and reinforcing steel bars can be added to improve the crack resistance of the concrete component.

And 2, performing spiral guniting stirring and drilling on the soil body of the target area from top to bottom by using the annular stirring grooving device 7, and continuously spraying cement mortar into the foundation soil through a guniting port on the drill bit while stirring so as to mix the foundation soil and the concrete mortar in the stirring area. Each drill 10 forms a mixing pile 19 filled with cement soil in the foundation, and a plurality of mixing piles 19 are engaged with each other to form an end-to-end annular underground continuous groove structure, as shown in the middle diagram of fig. 9. At the moment, the underground continuous groove structure forms a circle of circular ring-shaped closed soft soil boundary with a specific size in the foundation, so that the prefabricated concrete circular ring-shaped pipe pile is convenient to insert. The depth of each stirring pile can be adjusted according to the actual situation, and the stirring piles can be drilled into the bearing layer when needed, so that the bearing capacity of the whole pile end is improved.

And 2, before the cement soil is cured, sequentially inserting the plurality of precast concrete arc-shaped members 1 into the underground continuous groove structure, so that the plurality of precast concrete arc-shaped members 1 are occluded end to end through the strip-shaped rectangular protrusions 3 and the strip-shaped grooves 4 to form a closed precast circular tubular pile 2 in a combined mode, as shown in the right drawing of fig. 9. When having a plurality of prefabricated ring shape tubular pile 2 as the depth direction, be under construction one by one to two prefabricated ring shape tubular pile 2 pass through annular protrusion 5 and the block assembly of annular groove 6 about making. Of course, if the prefabricated circular tubular pile 2 is integrated, the prefabricated circular tubular pile can be directly inserted without assembly.

The insertion mode is as follows: if the soil layer is soft, the prefabricated circular tubular pile 2 can be inserted by the dead weight, and if the soil layer is relatively hard, external force can be applied to press the pile.

And 3, inserting the prefabricated circular tubular pile 2 into a preset soil body depth, and slightly extending the prefabricated circular tubular pile 2 out of the ground surface. Then, a concrete bearing platform can be poured on the surface of the foundation, so that the top of the prefabricated circular tubular pile 2 and the bearing platform are connected into a whole, and a prefabricated barrel-shaped foundation structure is formed after solidification.

The above technical scheme, the utility model discloses a can effectively utilize the prefabricated tubbiness basis of major diameter who seals soil body bearing capacity, can greatly improve the vertical and level of basis and ground to bearing capacity, reduce the concrete volume to improve basis and superstructure's whole anti-seismic performance. The principle is simple and reliable, the construction method is simple and convenient, the applicable working condition is wide, and the influence of the site construction condition is small; can improve the safety and stability of the building structure and has certain energy-saving and environment-friendly effects.

The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. For example, the shape, size, fastening mode and the like of the prefabricated annular duct piece can be changed according to the actual engineering requirements. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims (8)

1. A large-diameter annular stirring groove-forming and then planting prefabricated barrel-shaped foundation structure is characterized by comprising a plurality of cement stirring piles (19) embedded into a foundation, wherein all the stirring piles (19) are arranged on the ground level along an annular shape, and adjacent stirring piles (19) are mutually meshed and connected to form an annular underground continuous groove structure connected end to end; a prefabricated circular tubular pile (2) made of concrete is inserted into the vertical ground in the underground continuous groove structure, the inner diameter of the prefabricated circular tubular pile (2) is larger than that of the underground continuous groove structure, and the outer diameter of the prefabricated circular tubular pile (2) is smaller than that of the underground continuous groove structure; the inner and outer side walls of the prefabricated circular tubular pile (2) are tightly combined with the boundary of the stirring pile (19) through filling cement soil.

2. The large-diameter annular stirring trenched-embedded prefabricated barrel-shaped foundation structure as claimed in claim 1, wherein the prefabricated annular tubular pile (2) is a split assembled tubular pile formed by combining a plurality of prefabricated concrete arc-shaped members (1), one end of each prefabricated concrete arc-shaped member (1) is provided with a strip-shaped rectangular protrusion (3), the other end of each prefabricated concrete arc-shaped member is provided with a strip-shaped groove (4) capable of being matched with the strip-shaped rectangular protrusion (3), and the plurality of prefabricated concrete arc-shaped members (1) are sequentially engaged to form a closed annular pile body connected end to end.

3. The large-diameter ring-shaped stirring trenched prefabricated bucket foundation structure as claimed in claim 1, wherein the number of the prefabricated ring-shaped tubular piles (2) is multiple, one end of each prefabricated ring-shaped tubular pile (2) is provided with a ring-shaped protrusion (5), the other end is provided with a ring-shaped groove (6) capable of being matched with the ring-shaped protrusion (5), and the plurality of prefabricated ring-shaped tubular piles (2) are sequentially connected in a stacked manner in the height direction.

4. Construction equipment for manufacturing large-diameter annular stirred tank pre-fabricated bucket foundations as claimed in claim 1, characterized by comprising a driving drill rod (9), a drill bit (10), an annular disc (14) and a driven drill rod (15); the driving drill rods (9) and the driven drill rods (15) are uniformly distributed along the circumferential direction of the disc body of the annular disc (14), and a drill bit (10) is arranged at the bottom of each driving drill rod (9) and each driven drill rod (15); two drill bits (10) at the bottoms of any two adjacent drill rods are arranged in a staggered manner in the height direction, and the drilling ranges of the two drill bits (10) are partially meshed in the projection direction; each driving drill rod (9) is in transmission connection with an output shaft of the motor (8), each driven drill rod (15) is installed on the annular disc (14) through a bearing (12), the driven drill rods (15) and the driving drill rods (9) form matched transmission through a transmission part (11), and the driving drill rods (9) drive the other driven drill rods (15) to synchronously rotate.

5. The construction equipment as claimed in claim 4, wherein the kelly (9) is externally sleeved with a sleeve (13), and the motor (8) is mounted on a fixed bracket (16).

6. Construction device according to claim 4, wherein said transmission member (11) is a gear or a chain.

7. The construction equipment as claimed in claim 4, wherein said drill (10) is detachably mounted to the bottom of the driving drill (9) and the driven drill (15).

8. The construction equipment as claimed in claim 4, wherein the number of the driving drill rods (9) is not less than 2, the driving drill rods are evenly distributed along the circumferential direction of the disc body of the annular disc (14), and the number of the driven drill rods (15) driven by each driving drill rod (9) is the same.

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