Miniature pile foundation bearing platform utilizing waste oil (sleeve) pipe and manufacturing method

Abstract

The invention discloses a miniature pile foundation bearing platform utilizing waste oil (sleeve) pipes and a manufacturing method, and belongs to the technical field of petrochemical engineering building (structure) foundation design, the miniature pile foundation bearing platform comprises a bearing platform main body, a stress component, a wedge-shaped connecting piece, oil (sleeve) pipe miniature piles and a socket type PVC grouting pipe, the waste oil (sleeve) pipes generated in the oil exploitation process are fully utilized, and the bearing platform main body is made into a whole. Secondary transformation is carried out through technology upgrading, and the miniature pile foundation and bearing platform foundation structure form is innovated, so that the miniature pile foundation and bearing platform foundation structure form is manufactured into the miniature prefabricated pipe pile with high bearing capacity. Under the condition that the integrity of a pile body and the requirement for an anti-corrosion structure are guaranteed, a steel structure wedge-shaped connecting piece is designed and constructed to be effectively connected with a reinforced concrete bearing platform, and then the miniature pile foundation and the combined bearing platform which utilize the waste oil (sleeve) pipe are formed.

Description

Technical Field

[0001] The present invention belongs to the technical field of the foundation design of petrochemical buildings and structures, and particularly relates to a micro-pile foundation cap using waste oil (casing) pipes and a manufacturing method thereof. Background Art

[0002] At present, the foundation forms for oilfield buildings and structures often adopt independent foundations and raft foundations, and the ground treatment often adopts replacement cushions for construction. However, this method requires large-scale excavation of the foundation soil, with a long construction period, a large amount of soil to be processed, and the dust generated during the excavation process causing relatively large pollution to the surrounding environment, which is not conducive to the occupational safety and health of on-site construction workers. In addition, the depth of the treated soil layer is limited (generally the treatment depth is 0.5m - 3.0m), and the ground treatment effect on sites in medium and high-thickness filled soil areas, saturated cohesive soil, silty clay and other sites is very limited.

[0003] And there are also the following limitations in using pile foundations for ground treatment in case of poor geological conditions:

[0004] (1) The cost of pile foundations is relatively high. In industrial station buildings and structures, when using the form of cast-in-place concrete pile foundations, the equipment used and the consumption of concrete and steel materials are relatively large; for equipment with relatively small upper loads and simple foundation structures, using pile foundation design will inevitably increase the construction cost.

[0005] (2) The construction process is cumbersome. The construction of traditional cast-in-place piles and pre-stressed pipe piles often requires the operation of large-scale mechanical equipment, with a long construction period, and each process needs to be closely connected, which is not conducive to the lightweight construction of machinery and the reduction management on site.

[0006] (3) The structure of the pile cap is complex. Whether using pre-stressed pipe piles or cast-in-place concrete piles, the pile body and the pile cap are both connected through complex structures to ensure their effective connection. Usually, the pile head is connected to the foundation with radial steel bars. This method requires secondary construction of the pile head, and after the pile body construction is completed, the pile head needs to be broken again and integrally poured with the pile cap, with a complex structure.

[0007] (4) The quality of pile formation is difficult to control. The commonly used cast-in-place piles and precast pile foundations often have common problems such as broken piles, segregation, and necking during construction, seriously affecting the quality of on-site pile formation, and the discreteness of later detection is relatively large, and there are certain potential safety hazards in the project quality.

[0008] In summary, the existing foundation forms and ground treatment methods adopted in the petrochemical industry still follow the design and construction concepts of the specifications for building foundations and ground treatment, with a single foundation form, conservative ground treatment, complex construction processes, long construction periods, and high costs; and the waste materials generated during the oil and gas extraction process have not been fully utilized. Summary of the Invention

[0009] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a micro pile foundation cap using waste oil (casing) pipes and a manufacturing method thereof, so as to solve the problems of single foundation form, conservative foundation treatment, complex construction procedures, long construction period and high cost in the prior art.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions to be realized:

[0011] A micro pile foundation cap using waste oil (casing) pipes, comprising: a cap main body, on which a stress member is provided, and a plurality of wedge-shaped connectors with large heads facing downwards are cast and fixed inside it. A plurality of internal screw holes are opened at the lower part of the wedge-shaped connectors, and oil (casing) pipe micro piles are fixedly connected in the internal screw holes to form a micro pile group. Through holes are opened at the positions corresponding to the internal screw holes above the wedge-shaped connectors, and socket-type PVC grouting pipes are arranged in the through holes.

[0012] Preferably, the wedge-shaped connector is a stainless steel enlarged head wedge-shaped connector, and a serrated structure is arranged at its edge.

[0013] Preferably, a thread for connecting with the wedge-shaped connector is provided above the oil (casing) pipe micro pile; longitudinal connectors are connected to the side wall of the oil (casing) pipe micro pile for connecting with other oil (casing) pipe micro piles to form a micro pile group.

[0014] Preferably, the longitudinal connectors include pipeline clamps and angle steels; the pipeline clamps are sleeved on the side wall of the oil (casing) pipe micro pile and fixed to the angle steels through fastening bolts.

[0015] Preferably, the lower end of the oil (casing) pipe micro pile is a conical plug, and a plurality of micro nozzles are opened on the side wall of the lower end of the oil (casing) pipe micro pile above the conical plug.

[0016] Preferably, when there are corrosion perforations on the side wall of the pipe column of the oil (casing) pipe micro pile, extrusion-expanded branch plates are opened.

[0017] Preferably, a cushion layer is further provided below the cap main body.

[0018] Preferably, steel bars are further arranged inside the cap main body.

[0019] A manufacturing method of a micro pile foundation cap using waste oil (casing) pipes, comprising the following steps:

[0020] Connect the oil (casing) pipe micro piles at the lower end of the wedge-shaped connector and fix the socket-type PVC grouting pipe above;

[0021] Connect the oil (casing) pipe micro piles fixed on the same wedge-shaped connector to each other to form a micro pile group;

[0022] After embedding the wedge-shaped connector, the socket PVC grouting pipe and the fixing parts of the micropile group in fixed positions, the concrete is poured integrally to form a micropile foundation platform using waste oil (casing) pipes.

[0023] Preferably, a cushion layer is also laid under the integrally cast micropile foundation platform using waste oil (casing) pipes.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention discloses a micropile foundation platform using waste oil (casing) pipes. In view of the particularity of precast piles, the pile body structure is innovated. The pile machine material uses waste oil (casing) pipes generated during the oil extraction process, and the cost is almost zero. Moreover, the wall thickness of the oil (casing) pipe is relatively large, and the material properties are very close to those of building precast steel piles. While meeting the requirements of the micropile structure, the bearing capacity of the pile body can be maximally improved. In addition, the wedge-shaped connector prefabricated in the factory, together with the reinforced concrete foundation platform, forms a rigid-concrete composite structure, which can give full play to the advantages of both: the concrete foundation platform is convenient for connecting the upper main structure, and the constructed wedge-shaped connector can conveniently integrate the lower waste oil (casing) pipes. After the two are integrally cast, they can achieve the effect of joint force. A through hole is opened at the position corresponding to the inner screw hole above the wedge-shaped connector, and the socket PVC grouting pipe is inserted into it and integrally cast with the concrete foundation platform to jointly bear the force to form a steel-concrete composite structure foundation platform. The socket PVC grouting pipe protrudes 10-20 cm from the foundation platform, which is convenient for subsequent grouting construction. This application can simplify the foundation platform structure to the greatest extent without changing the upper structure of the waste oil (casing) pipe micropile, simplify the complex structural connection method between the micropile and the foundation platform, thereby reducing the construction process, facilitating the control of construction quality on site, saving investment, and having good economic benefits, social benefits and application prospects; and it can make the most of the waste materials generated during the oil and gas extraction process and maximize the conservation and intensification of resources.

[0026] Furthermore, the present invention innovatively adopts a wedge-shaped connector with a stainless steel integral enlarged head, which can realize standardized design, factory batch production and on-site assembly construction, improve the engineering construction speed and facilitate the control of engineering quality. Its wedge-shaped structure (with a serrated structure arranged at the edge) can further strengthen the effective connection between the foundation platform concrete and the connector [playing a better anchoring and anti-pulling role]. The stainless steel material can be reused, which conforms to the ideas and policies of promoting green construction in the country.

[0027] Furthermore, for the micro-piles improved from the waste oil (casing) pipes of the present invention, by arranging the extrusion-expanded branch plate structure on the side wall of the pile with corrosion perforation and arranging the jet grouting holes structure at the bottom of the pile body, a tree-node pile-soil stress structure (friction pile) can be formed on the side of the pile, and a bearing structure with an enlarged bottom at the bottom of the pile (end-bearing pile) can be formed at the bottom of the pile, giving full play to the technical advantages of the friction pile and the end-bearing pile. In addition, a connecting conical plug is arranged at the bottom of the pile to ensure the formation of the soil compaction effect during the construction of the jacked pile and improve the density of the foundation soil.

[0028] Furthermore, due to the relatively small pile diameter of the oil (casing) pipe pile, its single-pile shear resistance is smaller than that of general precast steel piles. The present invention adopts longitudinal connectors connected to the side wall of the oil pipe micro-pile for connecting with other oil pipe micro-piles to form a micro-pile group, longitudinally connecting the micro-piles to form a micro-pile group, which greatly improves the horizontal shear resistance of the pile group.

[0029] A manufacturing method of a micro-pile foundation cap using waste oil (casing) pipes disclosed by the present invention makes full use of the waste oil (casing) pipes generated during the oil extraction process, and through technical upgrading for secondary transformation, it is made into a micro precast pipe pile that can be filled with and sprayed with reinforcing slurry inside and has a certain stiffness itself. Under the condition of ensuring the integrity of the pile body and the requirements of the anti-corrosion structure, through the design of the structural steel wedge-shaped connector for effective connection with the reinforced concrete foundation cap, a micro-pile foundation and a combined foundation cap using waste oil (casing) pipes are formed. The adoption of the above technology can simplify the foundation structure to the greatest extent, reduce the foundation investment, increase the depth of the foundation treatment under the foundation, reduce the on-site excavation workload, and further improve the foundation bearing capacity of buildings and structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the detailed drawing of the steel-concrete combined structure foundation cap of the present invention; among them, (a) is the top view, and (b) is the view in the 1-1 direction;

[0031] Figure 2 It is the schematic diagram of the wedge-shaped connector structure of the present invention;

[0032] Figure 3 It is the detailed drawing of the extrusion-expanded branch plate structure of the waste oil (casing) pipe micro-pile body of the present invention;

[0033] Figure 4 It is the detailed drawing of the longitudinal connection structure of the waste oil (casing) pipe micro-pile body of the present invention.

[0034] Wherein: 1 - stress-bearing member; 2 - main body of the bearing platform; 3 - wedge-shaped connecting member; 4 - micro-pile of oil (casing) pipe; 5 - longitudinal connecting member; 6 - cushion layer; 7 - steel bar; 8 - internal screw hole; 9 - expanded branch plate; 10 - conical plug; 11 - micro-nozzle; 12 - pipeline clamp; 13 - angle steel; 14 - connecting thread; 15 - serrated structure; 16 - fastening bolt; 17 - socket PVC grouting pipe; 18 - corrosion perforation. Specific implementation mode

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] The present invention will be further described in detail below in conjunction with the drawings:

[0038] Aiming at the problems existing in the prior art, the present invention provides a micro-pile foundation bearing platform using waste oil (casing) pipes and a manufacturing method, thereby effectively solving the problems of large area of foundation treatment and insufficient treatment depth in the foundation treatment of small and medium-sized equipment in the petrochemical industry in areas with large thickness of filled soil, collapsible loess areas, mucky soil and saturated clay sites. The main materials of the pile driver can also make full use of the waste materials in the production and operation of oil and gas, saving costs and shortening the construction period.

[0039] A micro pile foundation cap using waste oil (casing) pipes and its manufacturing method according to the present invention. The waste oil (casing) pipes generated during the oil extraction process are fully utilized, and through technological upgrading, they are secondarily transformed into micro precast pipe piles that can be filled with internal and externally sprayed reinforcement slurries and have a certain stiffness by themselves. Under the condition of ensuring the integrity of the pile body and the requirements of the anti-corrosion structure, a steel structure wedge-shaped connector is designed and effectively connected with the reinforced concrete pile cap, thereby forming a micro pile foundation and a combined pile cap using waste oil (casing) pipes. The adoption of the above technology can simplify the foundation structure to the greatest extent, reduce the foundation investment, increase the depth of foundation treatment of the foundation, reduce the on-site excavation workload, and further improve the bearing capacity of the foundation of buildings and structures.

[0040] See Figure 1 , this application discloses a micro pile foundation cap using waste oil (casing) pipes, which is characterized in that it includes: a pile cap main body 2, on which a stress member 1 is arranged, and a number of wedge-shaped connectors 3 with large heads facing down are cast and fixed inside. A number of internal screw holes 8 are opened at the lower part of the wedge-shaped connector 3, and an oil casing micro pile 4 is fixedly connected in the internal screw hole 8. Through holes are opened at the positions corresponding to the internal screw holes 8 above the wedge-shaped connector 3, and a socket PVC grouting pipe 17 is arranged in the through holes. In view of the particularity of the precast pile foundation, the innovation of the pile body structure is carried out. It uses the waste oil (casing) pipes generated during the oil extraction process, and the cost is almost zero. Moreover, the wall thickness of the oil (casing) pipe is relatively large, which can maximize the bearing capacity of the pile body while meeting the requirements of the micro pile structure. In addition, the wedge-shaped connectors prefabricated in the factory and the reinforced concrete pile cap form a rigid-concrete composite structure, which can give full play to the advantages of both: the concrete pile cap is convenient for connecting the upper main structure, and the constructed wedge-shaped connectors can conveniently integrate the lower waste oil (casing) pipes. After the two are integrally cast, they can achieve the effect of joint force. Through holes are opened at the positions corresponding to the internal screw holes above the wedge-shaped connector, and the socket PVC grouting pipe is inserted into it and integrally cast with the concrete pile cap to jointly form a rigid-concrete composite structure pile cap. The socket PVC grouting pipe extends 10-20 cm out of the pile cap, which is convenient for subsequent grouting construction. This application can simplify the pile cap structure of the foundation to the greatest extent without changing the upper structure of the waste oil (casing) pipe micro pile, simplify the complex structural connection method between the micro pile and the pile cap, thereby reducing the construction process, simplifying the management mode, being more convenient for on-site construction quality control, saving investment, and having good economic benefits, social benefits and application prospects.

[0041] In some embodiments, see Figure 2 , the wedge-shaped connector 3 is a stainless steel enlarged head wedge-shaped connector, and a serrated structure 15 is arranged at its edge, which plays a role in increasing the contact area with the reinforced concrete pile foundation cap and improving the bonding force between the two.

[0042] In some embodiments, there is a thread for connection with the wedge-shaped connector 3 above the oil (casing) pipe micropile 4; a longitudinal connector 5 is connected to the side wall of the oil (casing) pipe micropile 4 for horizontal connection with other oil (casing) pipe micropiles 4.

[0043] In some embodiments, referring to Figure 4 , the longitudinal connector 5 includes a pipeline clamp 12 and an angle steel 13; the pipeline clamp 12 is sleeved on the side wall of the oil (casing) pipe micropile 4 and fixed to the angle steel 13 through fastening bolts 16; it is convenient for the horizontal connection structure of the pile body, plays a longitudinal connection role, and prevents the pile body from tilting caused by uneven settlement.

[0044] In some embodiments, the lower end of the oil (casing) pipe micropile 4 is a conical plug 10, and several micro nozzles 11 are opened on the side wall of the lower end of the oil (casing) pipe micropile 4 above the conical plug 10. By using the method of pressure grouting, an enlarged pile tip is formed at the lower part of the oil casing, forming the structural configuration of a micro end-bearing pile.

[0045] In some embodiments, referring to Figure 3 , when there is a corrosion perforation 18 on the side wall of the pipe column of the oil (casing) pipe micropile 4, an extruded branch plate 9 is opened; it can be opened outward under the action of a certain grouting pressure, facilitating the ejection of the grouting liquid, and enabling a single oil (casing) pipe to form a pile-soil co-action pile joint stress structure.

[0046] In some embodiments, a cushion layer 6 is further provided below the pile cap body 2; to ensure the co-action of the pile and the soil.

[0047] In some embodiments, steel bars 7 are further provided inside the pile cap body 2.

[0048] In some embodiments, after grouting, the upper part is sealed with insulating putty to play an anti-corrosion structure, and there is no filling in the upper part of the pile body.

[0049] In some embodiments, different from traditional precast pile foundations, the cross-section of the waste oil casing is small, but the wall thickness is large and the structural stiffness is large. The micropile group can be pressed into the soil layer by the static pressure method, reducing the damage to the soil layer stability caused by vibration pile driving. In addition, the static pressure can produce a soil compaction effect on the foundation soil layer, further improving the soil layer bearing capacity.

[0050] In some embodiments, the length of the waste oil casing pile is controlled within 5 - 10 m, which can effectively penetrate the large thickness of the filled soil depth and maximize the solution of the stability of the equipment foundation in the on-site high-thickness filled area.

[0051] In some embodiments, a 1.5 m-wide apron is set around the foundation, and a site drainage slope is set within 5 m to avoid the negative friction effect of the pile body caused by the settlement of the foundation soil in the collapsible loess area.

[0052] In some embodiments, the present invention makes full use of the pressure grouting pipe and the jet grouting principle. The grouting material is locally sourced and controlled at low cost. Cement soil, which is easily available in the loess area, is used as the grouting material. It not only plays an internal anti-corrosion role but also improves the pile body strength. It is convenient for on-site construction and omits the process of a large number of materials. Compared with traditional precast pile foundations, the present invention adopts a brand-new micro-pile construction idea. Since the used oil (casing) pipe has a smaller diameter, the requirements for static pile machinery and equipment are lower, which can greatly reduce the on-site equipment cost budget. The used oil (casing) pipe has a certain pile body length specification, and the pile length is controlled within 5 - 10 m, which can effectively penetrate the large thickness of the fill depth and maximize the solution of the stability of the foundation of the equipment in the high-thickness fill area on-site.

[0053] The present invention also discloses a manufacturing method for a micro-pile foundation cap using a used oil (casing) pipe, including the following steps:

[0054] S1: Connect the oil (casing) pipe micro-pile 4 to the lower end of the wedge-shaped connector 3, and fix the socket-type PVC grouting pipe 17 above.

[0055] S2: Connect the oil (casing) pipe micro-piles 4 fixed on the same wedge-shaped connector 3 to form a micro-pile group.

[0056] S3: After pre-burying the wedge-shaped connector 3, the socket-type PVC grouting pipe 17, and the fixing parts of the micro-pile group at the fixed positions, pour concrete integrally to form a micro-pile foundation cap using a used oil (casing) pipe.

[0057] This method makes full use of the used oil (casing) pipes generated during the oil extraction process, and through technological upgrading, it is secondarily transformed into a micro precast pipe pile that can be filled with internal and externally sprayed reinforcement slurry and has a certain stiffness itself. Under the condition of ensuring the integrity of the pile body and the requirements of the anti-corrosion structure, through the design of the structural steel wedge-shaped connector, it is effectively connected to the reinforced concrete foundation cap, thereby forming a micro-pile foundation and a combined foundation cap using a used oil (casing) pipe. Using the above technology can maximize the simplification of the foundation structure, reduce the foundation investment, increase the depth of foundation treatment below the foundation, reduce the on-site excavation workload, and further improve the bearing capacity of the foundation of the building and structure.

[0058] In some embodiments, a cushion layer 6 is also laid under the integrally cast micro-pile foundation cap using a used oil (casing) pipe to ensure the common action of the pile and the soil.

[0059]

Embodiment

[0060] A manufacturing method for a micro-pile foundation cap using a used oil (casing) pipe, including the following steps:

[0061] Step 1: Prefabricate the wedge-shaped connector 3 in the factory, and arrange the screw holes 8 in the wedge-shaped connector in a plum blossom shape at the bottom of the connector. Prefabricate the sawtooth structure 15 on the edge of the wedge-shaped connector on the side wall of the wedge-shaped connector 3 (to improve the bite force between the wedge-shaped connector and the pile foundation cap when integrally cast, and ensure the effective connection between the two).

[0062] Step 2: respectively make holes in the side walls of the waste oil (casing) pipe micropile 4, set an extrusion support plate 9, and a micro nozzle 11 at the bottom of the waste oil (casing) pipe micropile, and a conical plug (threaded connection) 10 at the bottom of the waste oil (casing) pipe micropile under the bottom oil pipe to ensure the static pressure extrusion effect.

[0063] Step 3: A through hole is opened above the bolt thread of the wedge-shaped enlarged head connector, and a socket-type PVC grouting pipe is inserted into it, which is cast and fixed with the concrete cap as a whole, and the force is jointly applied to form a steel-concrete composite structure cap. The socket-type PVC grouting pipe is inserted and extended 10-20cm from the cap to facilitate subsequent grouting construction.

[0064] Step 4: A waste oil (casing) pipe micropile body longitudinal connector 5 is sleeved on the upper connection part of a single oil (casing) pipe in the waste oil (casing) pipe micropile group, which is composed of a pipeline clamp 12 and an angle steel 13 of the longitudinal connector; during construction, the pipeline clamp 12 of the longitudinal connector 5 is first sleeved and connected to the waste oil (casing) pipe micropile 4, and then the pipeline clamp 12 and the angle steel 13 are fastened and connected by fastening bolts 16. Ensure that the waste oil (casing) pipe micropiles between the longitudinal connections are stressed together and deformed in coordination. Minimize the inclination of the cap caused by the incoordination of the micropile foundation deformation caused by uneven foundation settlement.

[0065] Step 5: The improved waste oil (casing) pipe micro pile 4 is fixedly connected to the wedge-shaped connector 3 by threading. Each wedge-shaped connector 3 can be provided with a plurality of connector inner screw holes 8 as required, and a waste oil (casing) pipe micro pile group can be formed by connection. The whole is pre-embedded in the concrete cap. The number of pre-embedded can be combined according to the actual geological conditions, and it is recommended to adopt a symmetrical arrangement or a plum blossom arrangement.

[0066] Step 6: Arrange structural steel bars 7 inside the pedestal, and embed the connected wedge-shaped connectors 3 in a fixed position and then pour concrete as a whole to form a steel-concrete composite structure pedestal 2, which jointly support the upper load-bearing member 1.

[0067] Step 7: Lay a cushion layer 6 under the integrally cast steel-concrete composite structure cap 2 to ensure that the cap and the micro pile form a whole that is jointly stressed by the pile and the soil.

[0068] The present invention makes full use of the waste oil (casing) pipes generated during the oil extraction process, conducts secondary transformation through technological upgrading, innovates the structural form of the micro-pile foundation and the cap foundation, and makes them into micro precast pipe piles with high bearing capacity. Under the condition of ensuring the integrity of the pile body and the requirements of the anti-corrosion structure, an effective connection is made with the reinforced concrete cap through the designed structural steel wedge-shaped connector, thereby forming a micro-pile foundation and a combined cap using waste oil (casing) pipes. At present, the foundation forms and foundation treatment methods adopted for oilfield equipment in traditional technologies still remain at the design and construction concepts of buildings in the specifications; the present invention combines the materials in the oilfield production operation to upgrade the foundation form, can make the best use of the oil and gas field exploitation materials, simplify the foundation structure, reduce the foundation investment, and further improve the foundation bearing capacity of the buildings and structures, so as to achieve the purpose of cost saving. Further, the present invention adopts a simple structural principle to reconstruct and reuse the structure of the waste oil (casing) pipe micro-pile pile body, designs a new micro-pile with a spiral self-spray function, which is convenient for controlling the construction quality and saving investment, and has good economic benefits, social benefits and application prospects.

[0069] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A micro pile cap using waste oil (casing) pipes, Characterized in that, It includes: A pile cap main body (2) is provided with a stress member (1) on the pile cap main body (2), and a number of wedge-shaped connectors (3) with their large heads facing downwards are cast and fixed inside it. A number of internal screw holes (8) are opened at the lower part of the wedge-shaped connector (3), and oil (casing) pipe micro piles (4) are fixedly connected in the internal screw holes (8) to form a micro pile group. Through holes are opened at positions corresponding to the internal screw holes (8) above the wedge-shaped connector (3), and socket PVC grouting pipes (17) are arranged in the through holes.

2. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, The wedge-shaped connector (3) is a stainless steel enlarged head wedge-shaped connector, and a serrated structure (15) is arranged at its edge.

3. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, Threading for connecting with the wedge-shaped connector (3) is provided above the oil (casing) pipe micro pile (4); longitudinal connectors (5) are connected to the side wall of the oil (casing) pipe micro pile (4) for connecting with other oil (casing) pipe micro piles (4) to form a micro pile group.

4. A micro pile cap using waste oil (casing) pipes according to claim 3, Characterized in that, The longitudinal connector (5) includes a pipeline clamp (12) and an angle steel (13); the pipeline clamp (12) is sleeved on the side wall of the oil (casing) pipe micro pile (4) and fixed to the angle steel (13) through a fastening bolt (16).

5. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, The lower end of the oil (casing) pipe micro pile (4) is a conical plug (10), and a number of micro nozzles (11) are opened on the side wall of the lower end of the oil (casing) pipe micro pile (4) above the conical plug (10).

6. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, When there are corrosion perforations (18) on the side wall of the pipe column of the oil (casing) pipe micro pile (4), expansion discs (9) are opened.

7. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, A cushion layer (6) is further arranged below the pile cap main body (2).

8. A micro pile cap using waste oil (casing) pipes according to claim 1, Characterized in that, Steel bars (7) are further arranged inside the pile cap main body (2).

9. A manufacturing method of a micro pile cap using waste oil (casing) pipes according to any one of claims 1 to 8, Characterized in that, It includes the following steps: Connect the oil (casing) pipe micro pile (4) at the lower end of the wedge-shaped connector (3), and fix the socket PVC grouting pipe (17) above; Connect the oil (casing) pipe micro piles (4) fixed on the same wedge-shaped connector (3) to each other to form a micro pile group; After the wedge-shaped connecting piece (3), the socket PVC grouting pipe (17) and the fixing piece of the micropile group are pre-buried in the fixed positions, the concrete is integrally poured to form a micropile foundation platform using the waste oil (casing) pipe.

10. The manufacturing method of a micropile foundation platform using a waste oil (casing) pipe according to claim 9, characterized in that a cushion layer (6) is further laid under the integrally cast micropile foundation platform using the waste oil (casing) pipe.

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