Batholith new material pile casing

Abstract

The invention discloses a batholith new material pile casing, and belongs to the field of cast-in-situ bored pile technical equipment. The new batholith material pile casing comprises a casing body, the casing body is formed by one-time pouring of a new batholith material, the new batholith material comprises superhard rock particles, high-performance fibers and an adhesive, the casing body with high compressive strength, high breaking strength and high machining precision can be formed, and meanwhile a first connecting part and a second connecting part are formed at the two ends of the casing body respectively. The adjacent barrels are connected together in a matched and nested mode through the first connecting parts and the second connecting parts and are fixedly connected through the connecting pieces, so that the stability and reliability of connection between the adjacent barrels are guaranteed. The new batholith material pile casing has the advantages of being high in compressive strength and breaking strength, good in corrosion resistance and geometric stability, high in machining precision and the like, is suitable for earthquake fault zones, soft and broken soil layers, karst, rich in underground water and other stratums which are complex in geology and prone to hole collapse, can reduce 50%-60% of engineering investment compared with a steel pile casing, and has high application value.

Description

Technical Field

[0001] The invention belongs to the field of bored pile technology equipment, and in particular relates to a casing made of new rock foundation materials. Background Art

[0002] In bored piles, casing is often buried to locate the pile position to be drilled. For strata with complex geology and prone to hole collapse, such as earthquake fault zones, soft and broken soil layers, karst, and rich groundwater, a full casing follow-up construction method is required. The casing passes through the disadvantaged terrain and ensures the pile foundation is bored, improving construction efficiency and cost. At the same time, as a permanent structure, it improves the durability of the pile foundation.

[0003] At present, casings are basically made of steel, but steel casings have problems such as easy curling, deformation, high cost, low construction efficiency and material utilization. Summary of the invention

[0004] In response to one or more of the above defects or improvement needs in the prior art, the present invention provides a new rock foundation material casing, which has the characteristics of good corrosion resistance, geometric stability, high compressive strength and flexural strength, high processing precision, etc., and can solve the problems of easy curling and deformation of traditional steel casings. It is suitable for earthquake fault zones, soft and broken soil layers, karst, groundwater-rich and other geologically complex and prone to collapse strata, and has high application value.

[0005] To achieve the above-mentioned purpose, the present invention provides a rock foundation new material casing, which includes a cylinder body, which is cast and formed by the rock foundation new material at one time, and has a first connecting part and a second connecting part formed at both ends, and the first connecting parts and the second connecting parts of two adjacent cylinder bodies are matched and nested together, and are fixedly connected by a connecting piece; The new rock-based material includes super-hard rock particles, high-performance fibers and adhesives.

[0006] As a further improvement of the present invention, the wall thickness of the cylinder is not less than 40 mm; and / or, the length of the cylinder is not less than 3 m; and / or, the rock-based new material contains superhard rock particles with a mass percentage of not less than 80%.

[0007] As a further improvement of the present invention, the first connecting portion is provided with a first annular groove, and the second connecting portion can extend into and be nested in the first annular groove.

[0008] As a further improvement of the present invention, the outer wall of the second connecting portion is provided with a second annular groove, and a sealing strip is provided in the second annular groove.

[0009] As a further improvement of the present invention, at least one latching tooth is provided at the end of the second connecting portion, and a third groove matching the latching tooth is provided at the bottom of the first annular groove.

[0010] As a further improvement of the present invention, there are a plurality of the latching teeth, and the plurality of the latching teeth are evenly arranged along the end of the second connecting portion.

[0011] As a further improvement of the present invention, the first connecting portion and the second connecting portion are respectively provided with at least one set of first holes and second holes corresponding to each other; The connecting member includes a pin, and the pin connects the first connecting part and the second connecting part through the first hole and the second hole.

[0012] As a further improvement of the present invention, the first connecting portion and the second connecting portion are respectively evenly provided with a plurality of groups of the first holes and the second holes along the circumferential direction; and / or, The first hole or the second hole on one side close to the axis of the cylinder is a blind hole.

[0013] As a further improvement of the present invention, the outer surface of the first connecting portion is provided with threads, and the inner surface of the second connecting portion is correspondingly provided with threads; or, The inner surface of the first connection part is provided with threads, and the outer surface of the second connection part is correspondingly provided with threads.

[0014] As a further improvement of the present invention, the connecting member comprises a carbon fiber cloth, and the carbon fiber cloth is bonded and wrapped around the outer sides of the first connecting part and the second connecting part which are nested together; and / or, The connecting member comprises a clamp, which is clamped on the body of the cylinder, and the clamps on adjacent bodies of the cylinder are fixedly connected by at least two connecting rods.

[0015] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects: (1) The rock-based new material casing of the present invention comprises a cylinder body, which is made of rock-based new material. The rock-based new material comprises superhard rock particles, high-performance fibers and adhesives, and can form a cylinder body with high compressive strength, high flexural strength and high processing precision. At the same time, the first connecting part and the second connecting part are respectively formed at both ends of the cylinder body. The adjacent cylinder bodies are connected together by matching and nesting the first connecting part and the second connecting part, and are fixedly connected by connecting parts to ensure the stability and reliability of the connection between the adjacent cylinder bodies. The rock-based new material casing of the present invention has the characteristics of good corrosion resistance, geometric stability, high compressive strength and flexural strength, high processing precision, etc. It is suitable for earthquake fault zones, soft and broken soil layers, karst, groundwater-rich and other geologically complex and easy-to-collapse formations. Compared with steel casings, it can reduce 50-60% of engineering investment and has high application value.

[0017] (2) The rock foundation new material casing of the present invention is provided with threads at corresponding positions of the first connection part and the second connection part so that the two are connected by threads, or a first annular groove is provided at the end of the first connection part so that the end of the second connection part is nested in the first annular groove to ensure the reliability of the connection between the first connection part and the second connection part; a second annular groove is provided on the outer wall of the second connection part, and a sealing strip is provided in the second annular groove to seal the connection part between the first connection part and the second connection part to prevent external debris from entering the connection part and damaging it, thereby ensuring the stability of the connection between adjacent cylinders.

[0018] (3) The rock foundation new material casing of the present invention is provided with a latching tooth at the end of the second connecting part, and a third groove is correspondingly provided at the bottom of the first annular groove, so that the latching tooth is engaged in the third groove to limit the relative rotation between the first connecting part and the second connecting part; at least one group of first holes and second holes are respectively provided in the first connecting part and the second connecting part, and the first connecting part and the second connecting part are fixedly connected together by a pin shaft, which can not only constrain the axial relative displacement between the first connecting part and the second connecting part, but also limit the relative rotation between the first connecting part and the second connecting part, so that the connection between adjacent cylinders is firm and reliable.

[0019] (4) The rock foundation new material casing of the present invention is wrapped with carbon fiber cloth on the outer sides of the first connecting part and the second connecting part which are nested together, so as to improve the strength of the connecting parts and restrain the relative movement between adjacent cylinders. The carbon fiber cloth can also restrain the pin shaft to prevent the pin shaft from falling off, thereby improving the connection performance between adjacent cylinders. By arranging a clamp on the cylinder body and rigidly connecting the clamps on adjacent cylinder bodies, the relative movement between adjacent cylinder bodies is restrained, thereby further improving the connection performance between adjacent cylinder bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is an exploded view of a rock foundation new material casing in an embodiment of the present invention; Figure 2 It is a schematic diagram of the overall structure of the cylinder in an embodiment of the present invention; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0022] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. cylinder; 11. first connecting portion; 111. first annular groove; 112. third groove; 113. first channel; 114. first external expansion angle; 12. second connecting portion; 121. latch; 122. second channel; 123. second external expansion angle; 13. cylinder body; 2. connecting member; 21. pin; 22. carbon fiber cloth. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Example: See also Figure 1~Figure 4 The rock-based new material casing in the preferred embodiment of the present invention includes a cylinder 1, and the cylinder 1 is cast and formed in one go using the rock-based new material. The rock-based new material includes super-hard rock particles, high-performance fibers and adhesives. Specifically, the super-hard rock particles as the main aggregate make the cylinder 1 have high compressive strength, the high-performance fibers can enhance the flexural strength of the cylinder 1, and the adhesive bonds the super-hard rock particles and the high-performance fibers together to form a cylinder 1 with high cohesion and strong integrity. The material properties of the cylinder 1 prepared from the rock-based new material in the present invention can reach: Young's modulus is not less than 55GPa, the flexural strength is 16~25MPa, and the compressive strength is not less than 250MPa, that is, the cylinder 1 has the characteristics of high compressive strength, high flexural strength, high processing precision, good corrosion resistance, geometric stability and the like.

[0029] In this embodiment, superhard rock refers to rock with a compressive strength of not less than 200 MPa. Preferably, the superhard rock used in the new rock-based material of the present invention has a compressive strength of not less than 250 MPa and a flexural strength of not less than 30 MPa.

[0030] Exemplarily, the superhard rock particles are siliceous superhard rock particles; preferably, the new rock-based material contains superhard rock particles in an amount of not less than 80% by mass to ensure high compressive strength of the cylinder 1.

[0031] Preferably, the adhesive comprises a modified epoxy resin and a curing agent.

[0032] Preferably, the wall thickness of the cylinder body 1 is not less than 40 mm, which is thicker than the wall thickness of the traditional steel casing, and can better solve the problems of easy curling and deformation of the traditional steel casing.

[0033] Preferably, the length of the barrel 1 is not less than 3 meters. Since the barrel is cast and formed by a one-time casting of the rock-based new material, it is difficult to perform secondary processing on the material, and the casting process has certain restrictions on the size of the barrel 1. Therefore, the length of the barrel 1 is further preferably 3 to 10 meters. If the length of the barrel 1 is too long, the equipment and molds for processing it are required to be high and the investment is large. Therefore, when the required length of the casing is long, it is also necessary to solve the problem of segmented installation of the rock-based new material barrel 1.

[0034] Specifically, when the cylinder 1 is formed, a first connection portion 11 and a second connection portion 12 are respectively formed at both ends thereof. The first connection portions 11 and the second connection portions 12 of two adjacent cylinders 1 are matched and nested together and fixedly connected by a connector 2 .

[0035] In this embodiment, the connection between adjacent cylinders 1 is achieved by mutual nesting and connecting parts 2, so that multiple cylinders 1 are connected to form a casing with high compressive strength and high flexural strength, which can pass through disadvantageous terrain and protect pile foundation holes. The new rock foundation material casing of the present invention is preferably constructed by static pile pressure method, which is suitable for earthquake fault zones, soft and broken soil layers, karst, groundwater-rich and other geologically complex and prone to collapse formations. Compared with steel casings, it can reduce 50~60% of engineering investment and has high application value.

[0036] In actual use, the new rock foundation material casing of the present invention can be buried at a depth of 20 meters or more in a soft soil layer, and at a depth of 10 meters or more in a hard soil layer.

[0037] In a preferred embodiment, the first connection portion 11 may be sleeved on the outside of the second connection portion 12, or the second connection portion 12 may be sleeved on the outside of the first connection portion 11, without any specific limitation.

[0038] In a preferred embodiment, the outer surface of the first connecting part 11 is provided with threads, the inner surface of the second connecting part 12 is correspondingly provided with threads, the second connecting part 12 is sleeved on the outer side of the first connecting part 11, and the two are connected by threads to ensure the reliability of the connection between the two; or, the inner surface of the first connecting part 11 is provided with threads, the outer surface of the second connecting part 12 is correspondingly provided with threads, the first connecting part 11 is sleeved on the outer side of the second connecting part 12, and the two are connected by threads to ensure the reliability of the connection between the two.

[0039] In another preferred embodiment, a first annular groove 111 is formed at the end of the first connecting portion 11 , and an end of the second connecting portion 12 can extend into and be nested in the first annular groove 111 .

[0040] Preferably, the first annular groove 111 extends a certain length in the axial direction, and the end of the second connecting part 12 matches the size of the first annular groove 111, so that the end of the second connecting part 12 is embedded in the first annular groove 111 of the first connecting part 11 to a certain depth, thereby ensuring the reliability of the connection between the first connecting part 11 and the second connecting part 12.

[0041] Further preferably, at least one latching tooth 121 is provided at the end of the second connecting portion 12, and a third groove 112 matching the latching tooth 121 is provided at the bottom of the first annular groove 111. When the end of the second connecting portion 12 extends into the first annular groove 111, the two adjacent cylinders 1 are rotated so that the latching tooth 121 is aligned and extends into the third groove 112. The latching tooth 121 is engaged in the third groove 112, which can limit the relative rotation between the first connecting portion 11 and the second connecting portion 12, so as to ensure the integrity and stability of the casing structure formed by splicing multiple cylinders 1.

[0042] Preferably, the shape of the latching teeth 121 can be triangular, rectangular, arc-shaped, etc., without limitation.

[0043] Preferably, there are multiple latching teeth 121, and the multiple latching teeth 121 are evenly arranged along the end of the second connecting part 12. Correspondingly, there are multiple third grooves 112 at the bottom of the first annular groove 111 that are also evenly spaced, so that the end latching positions of the second connecting part 12 and the first connecting part 11 are evenly distributed, so that each latching part is evenly stressed to reduce the force of a single latching part, thereby avoiding concentrated force from damaging the latching teeth 121.

[0044] Further preferably, the first connecting part 11 and the second connecting part 12 are respectively provided with at least one corresponding set of first channels 113 and second channels 122, and the connecting member 2 includes a pin 21, and the pin 21 connects the first connecting part 11 and the second connecting part 12 through the first channel 113 and the second channel 122.

[0045] In this preferred embodiment, when the first connecting part 11 and the second connecting part 12 are nested together, the first channel 113 on the first connecting part 11 is aligned with the second channel 122 on the second connecting part, and the first connecting part 11 and the second connecting part 12 are fixedly connected together by the pin 21, which can not only constrain the axial relative displacement between the first connecting part 11 and the second connecting part 12, but also limit the relative rotation between the first connecting part 11 and the second connecting part 12, so that the connection between adjacent cylinders 1 is firm and reliable.

[0046] Preferably, the pin 21 may also be other fasteners, such as a bolt or the like.

[0047] Preferably, if Figure 1 As shown, the first connection part 11 and the second connection part 12 are respectively evenly provided with a plurality of groups of the first channels 113 and the second channels 122 along the circumferential direction, and are connected and fixed by a plurality of pins 21, so that the connection between the second connection part 12 and the first connection part 11 is more secure.

[0048] Preferably, the first hole 113 or the second hole 122 on the side close to the axis of the barrel 1 is a blind hole to prevent the pin 21 from penetrating the connection formed by the first connecting part 11 and the second connecting part 12 to weaken the strength of the connection part, and to prevent the pin 21 from extending into the casing to affect the construction of the drill string pile in the casing.

[0049] In a specific preferred embodiment, when the first connecting part 11 and the second connecting part 12 are both single-layer side walls, the first channel 113 or the second channel 122 on the inner side is a blind hole; in another preferred embodiment, the first connecting part 11 is provided with a first annular groove 111, and the second connecting part 12 is sleeved in the first annular groove 111, then the first channel 113 located on the outer wall of the first connecting part 11 is a through hole, and the part located on the inner wall of the first connecting part 11 is a blind hole.

[0050] Further preferably, the outer wall of the second connecting part 12 is provided with a second annular groove, and a sealing strip is provided in the second annular groove. When the second connecting part 12 is nested in the first annular groove 111, the sealing strip in the second annular groove is tightly attached to the side wall of the first annular groove 111, thereby sealing the connecting part between the first connecting part 11 and the second connecting part 12 to prevent external debris from entering the connecting part and causing damage thereto, thereby ensuring the stability of the connection between the adjacent cylinders 1.

[0051] Preferably, the second annular groove is located on a side of the second channel 122 away from the end of the second connecting portion 12 , so that the sealing strip in the second annular groove can completely seal the connecting portion between the first connecting portion 11 and the second connecting portion 12 .

[0052] Preferably, the connecting member 2 includes a carbon fiber cloth 22, and the carbon fiber cloth 22 is bonded and wrapped around the outer sides of the first connecting portion 11 and the second connecting portion 12 that are nested together. The carbon fiber cloth 22 can improve the strength of the connecting portion and constrain the relative movement between adjacent cylinders 1. In addition, the carbon fiber cloth 22 also constrains the pin shaft 21 to prevent the pin shaft 21 from falling off, thereby improving the connection performance between adjacent cylinders 1.

[0053] Preferably, the connecting member 2 includes a clamp, which is clamped on the barrel 13 of the barrel 1, and the clamps on the barrels of adjacent barrels 1 are fixedly connected by at least two connecting rods. The relative movement between adjacent barrels 1 is constrained by the rigid connection between the clamps, thereby further improving the connection performance between adjacent barrels 1.

[0054] In actual setting, the inner diameter of the first connecting part 11 and the second connecting part 12 is equal to the inner diameter of the cylinder body 13 to ensure the uniformity of the size of the cast-in-place piles inside the casing, and the outer diameter of the first connecting part 11 and the second connecting part 12 is larger than the outer diameter of the cylinder body 13 to enhance the strength of the two connecting parts and ensure the reliability of the cylinder body docking assembly.

[0055] Preferably, the first connecting portion 11 and / or the second connecting portion 12 is also provided with a first expansion angle 114 and a second expansion angle 123 for transition between the outer diameter of the first connecting portion 11 and / or the second connecting portion 12 and the outer diameter of the barrel 13 .

[0056] The present invention provides a rock foundation new material casing, the cylinder 1 is cast and formed by the rock foundation new material at one time, the rock foundation new material includes superhard rock particles, high-performance fiber and adhesive, and can form a cylinder 1 with high compressive strength, high flexural strength and high processing precision, and at the same time, the first connecting part 11 and the second connecting part 12 are formed at both ends of the cylinder 1, and the adjacent cylinders 1 are connected together by matching and nesting the first connecting part 11 and the second connecting part 12, and are fixedly connected by the connecting piece 2 to ensure the stability and reliability of the connection between the adjacent cylinders 1. The casing made of the rock foundation new material in this application has the characteristics of good corrosion resistance, geometric stability, high compressive strength and flexural strength, high processing precision, etc., which can solve the problems of easy curling and deformation of traditional steel casings, and is suitable for geologically complex and easy-to-collapse formations such as earthquake fault zones, weak and broken soil layers, karst, and rich in groundwater. By effectively solving the problem of segmented installation of the rock foundation new material cylinder, the application scope of the rock foundation new material is further expanded. At the same time, compared with steel casings, it can reduce 50~60% of engineering investment and has high application value.

[0057] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rock foundation new material casing, comprising a casing, characterized in that: The cylinder is cast in one go by new rock-based materials, and a first connection portion and a second connection portion are formed at both ends thereof, and the first connection portions and the second connection portions of two adjacent cylinders are matched and nested together and fixedly connected by a connecting piece; The new rock-based material includes super-hard rock particles, high-performance fibers and adhesives.

2. The rock foundation new material casing according to claim 1 is characterized in that: The wall thickness of the cylinder is not less than 40 mm; and / or, the length of the cylinder is not less than 3 m; and / or, the rock-based new material contains superhard rock particles in a mass percentage of not less than 80%.

3. The rock foundation new material casing according to claim 1 is characterized in that: The first connecting portion is provided with a first annular groove, and the second connecting portion can extend into and be nested in the first annular groove.

4. The rock foundation new material casing according to claim 3 is characterized in that: The outer wall of the second connecting portion is provided with a second annular groove, and a sealing strip is provided in the second annular groove.

5. The rock foundation new material casing according to claim 3 is characterized in that: The end of the second connecting portion is provided with at least one latching tooth, and the bottom of the first annular groove is provided with a third groove matching the latching tooth.

6. The rock foundation new material casing according to claim 5 is characterized in that: There are a plurality of the latching teeth, and the plurality of the latching teeth are evenly arranged along the end of the second connecting portion.

7. The rock foundation new material casing according to any one of claims 1 to 6, characterized in that: The first connection part and the second connection part are respectively provided with at least one set of first holes and second holes corresponding to each other; The connecting member includes a pin, and the pin connects the first connecting part and the second connecting part through the first hole and the second hole.

8. The rock foundation new material casing according to claim 7 is characterized in that: The first connecting portion and the second connecting portion are respectively evenly provided with a plurality of groups of the first holes and the second holes along the circumferential direction; and / or, The first hole or the second hole on one side close to the axis of the cylinder is a blind hole.

9. The rock foundation new material casing according to claim 1, characterized in that: The outer surface of the first connecting part is provided with threads, and the inner surface of the second connecting part is correspondingly provided with threads; or, The inner surface of the first connection part is provided with threads, and the outer surface of the second connection part is correspondingly provided with threads.

10. The rock foundation new material casing according to any one of claims 1 to 6, 8 and 9, characterized in that: The connecting member includes a carbon fiber cloth, and the carbon fiber cloth is bonded and wrapped around the outer sides of the first connecting part and the second connecting part which are nested together; and / or, The connecting member comprises a clamp, which is clamped on the body of the cylinder, and the clamps on adjacent bodies of the cylinder are fixedly connected by at least two connecting rods.

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