A full casing steel tube for construction

Abstract

This utility model discloses a complete casing steel cylinder for construction, relating to the field of construction equipment technology. It includes multiple coaxially connected double-walled casing sections, a casing shoe, and a locking device. The double-walled casing section consists of inner and outer cylinder walls. The upper insertion end has a tenon, and the lower receiving end has a mortise. Radial positioning is achieved through the engagement of the tenon and mortise. The locking device is located inside the receiving end and includes a laterally movable locking pin and a limiting pin. After the locking pin is inserted into the circular hole at the insertion end, axial connection is achieved by locking with the limiting pin. The casing shoe is fixed to the bottom casing section and has hard alloy flat teeth at the bottom. A water-swellable rubber ring is embedded in the annular sealing groove at its insertion end, forming a double seal upon compression. This utility model improves connection stability through a double-positioning and locking structure. Combined with sealing, wear-resistant, and corrosion-resistant design, it effectively solves problems such as loose connections, water leakage, and poor durability in existing casing construction, making it suitable for underground foundation construction and other scenarios.

Description

Technical Field

[0001] This utility model relates to the field of building construction equipment technology, and more specifically to a complete casing steel cylinder for construction. Background Technology

[0002] In building construction, especially in underground foundation construction, casing is an indispensable and crucial piece of equipment. Traditional steel casing often suffers from the following problems during construction: unstable connections between casing sections, prone to radial misalignment; insufficient sealing leading to mud leakage; poor wear resistance at the bottom of the casing, affecting drilling efficiency; and complex and easily failing locking structures. The flange bolt connection method used in existing technologies is cumbersome to install and cannot achieve precise radial positioning, making it prone to misalignment between casing sections, resulting in a decrease in overall structural strength. Utility Model Content

[0003] The purpose of this utility model is to provide a complete casing steel cylinder for construction in order to solve the above-mentioned technical problems.

[0004] The technical solution adopted by this utility model is as follows: a complete casing steel cylinder for construction, comprising: multiple coaxially connected double-walled casing sections, wherein the double-walled casing section is composed of an inner cylinder wall and an outer cylinder wall arranged coaxially; the upper end of the double-walled casing section is provided with a tenoned insertion end, and the lower end is provided with a tenoned receiving end, and adjacent double-walled casing sections are radially positioned by the engagement of the tenon and the tenon; a casing shoe is fixedly connected to the receiving end of the bottom double-walled casing section, and its bottom is provided with a hard alloy flat tooth; a locking device is provided inside the receiving end, including a locking pin that can move laterally and a limiting pin, wherein the locking pin is inserted into the round hole of the insertion end and then the limiting pin is inserted into the pin hole to achieve axial locking.

[0005] The locking device further includes: a guide groove at the end of the locking pin and a guide block that cooperates with it. When the locking pin is pushed forward to the point where the guide block contacts the end of the guide groove, a limiting pin is then inserted into the pin hole in the through hole to form an axial lock.

[0006] The cross-section of the locking pin is polygonal or a circle with a missing corner.

[0007] A limit baffle is provided at the end of the through hole away from the guide block.

[0008] The inner surface of the inner cylinder wall is polished.

[0009] The insertion end of the sleeve shoe is provided with an annular sealing groove, in which a water-swellable rubber ring is embedded. The rubber ring expands radially after axial compression to form a double seal.

[0010] The outer surface of the outer cylinder wall is coated with a graphene composite coating.

[0011] The flat teeth are arranged in a spiral radial pattern, and chip removal grooves are formed between adjacent flat teeth. The depth of the chip removal grooves gradually decreases from the root to the tip of the tooth.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0013] This utility model's construction casing steel cylinder achieves radial positioning of adjacent double-wall casing sections through tenon and mortise engagement, and axial locking through a locking device, ensuring the stability of the connection between casing sections and preventing loosening and displacement of the casing during construction. The mirror-finish treatment of the inner cylinder wall, the double-sealing structure of the casing shoe, and the graphene composite coating of the outer cylinder wall all play positive roles in reducing friction, preventing water seepage, and improving corrosion resistance, thereby enhancing the overall performance and service life of the casing. The hard alloy flat teeth at the bottom of the casing shoe, arranged in a spiral radial pattern with chip removal grooves, improves the drilling efficiency of the casing and facilitates construction operations. Attached Figure Description

[0014] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram of the spliced ​​structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the main structure of the double-walled sleeve joint of this utility model;

[0017] Figure 3 This is a top view schematic diagram of the double-walled sleeve joint of this utility model;

[0018] Figure 4 This is a bottom view schematic diagram of the double-walled sleeve joint structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the locking device structure of this utility model;

[0020] Figure 6 This is a partial cross-sectional view of the locking device of this utility model;

[0021] Figure 7 This is a schematic diagram of the main structure of the sleeve boot of this utility model;

[0022] The markings in the diagram are as follows: 1-Double-wall sleeve section, 11-Plug end, 111-Round hole, 112-Tongue, 12-Receiver end, 121-Locking device, 1210-Limiting baffle, 1211-Guide slider, 1212-Locking pin, 1213-Limiting pin, 1214-Guide groove, 1215-Pin hole, 1216-Through hole, 122-Tongue groove, 2-Sleeve shoe, 21-Flat tooth. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] In one embodiment of this utility model, such as Figure 1-7 As shown, this embodiment provides a complete casing steel cylinder for construction, including multiple coaxially connected double-wall casing sections 1, casing shoes 2, and locking devices 121.

[0026] Multiple coaxially connected double-walled sleeve sections 1, each consisting of an inner and outer cylindrical wall arranged coaxially. The double-wall structure enhances the overall strength and rigidity of the sleeve, enabling it to better withstand various loads during construction. Each double-walled sleeve section 1 has an upper insertion end 11 with a tenon 112 and a lower receiving end 12 with a mortise 122. Adjacent double-walled sleeve sections 1 are radially positioned through the engagement of the tenon 112 and the mortise 122. The mating structure of the tenon 112 and the mortise 122 is simple and practical, accurately positioning adjacent sleeve sections radially, ensuring the overall coaxiality of the sleeve, and preventing radial offset.

[0027] The casing shoe 2 is fixedly connected to the receiving end 12 of the bottommost double-wall casing section 1, and its bottom is provided with carbide flat teeth 21. As the front end component of the casing, the casing shoe 2 needs to withstand greater resistance and wear during construction. The carbide flat teeth 21 have high hardness and wear resistance, which can effectively break up media such as soil and rock, facilitating the drilling of the casing.

[0028] The locking device 121 is disposed inside the receiving end 12 and includes a laterally movable locking pin 1212 and a limiting pin 1213. The locking pin 1212 is inserted into the round hole 111 of the insertion end 11, and the limiting pin 1213 is inserted into the pin hole 1215 to achieve axial locking. After the adjacent double-walled sleeve sections 1 are radially positioned by the tenon 112 and the mortise 122, the locking pin 1212 is moved to insert into the round hole 111 of the insertion end 11, and then the limiting pin 1213 is inserted into the pin hole 1215, thereby achieving axial locking between the sleeve sections and ensuring that the sleeves are firmly connected in the axial direction without loosening.

[0029] In another embodiment of this utility model, the locking device 121 further includes a guide groove 1214 disposed at the end of the locking pin 1212 and a guide slider 1211 cooperating therewith. When the locking pin 1212 is advanced to the point where the guide slider 1211 contacts the end of the guide groove 1214, a limiting pin 1213 is inserted into the pin hole 1215 in the through hole 1216 to form an axial lock. The guide groove 1214 and the guide slider 1211 provide guidance and limiting for the movement of the locking pin 1212, enabling the locking pin 1212 to move accurately to the predetermined position and ensuring the reliable operation of the locking device 121.

[0030] In another embodiment of this utility model, the cross-section of the locking pin 1212 is polygonal or a circle with a missing corner. This shape design can prevent the locking pin 1212 from rotating within the circular hole 111, ensuring a more stable connection between the locking pin 1212 and the insertion end 11, and avoiding axial locking failure due to rotation of the locking pin 1212.

[0031] In another embodiment of this utility model, a limiting baffle 1210 is provided at the end of the through hole 1216 away from the guide slider 1211. The limiting baffle 1210 can prevent the locking pin 1212 from falling out of the through hole 1216 during movement, playing a safety limiting role and ensuring the structural integrity and stability of the locking device 121. Preferably, the limiting baffle 1210 is set as a telescopic structure, so that after installation, one end of the through hole 1216 can be closed by the limiting baffle 1210.

[0032] In another embodiment of this invention, the inner surface of the inner cylinder wall is polished. A mirror-finish inner surface reduces friction between the inside of the sleeve and construction materials (such as concrete), facilitating material transport and construction operations, and also helps to extend the service life of the sleeve.

[0033] In another embodiment of this utility model, the insertion end 11 of the casing shoe 2 is provided with an annular sealing groove, in which a water-swellable rubber ring is embedded. The rubber ring expands radially after axial compression to form a double seal. In construction environments rich in groundwater, the water-swellable rubber ring expands upon contact with water. When subjected to axial compression, its radial expansion tightly seals the connection gap between the casing shoe 2 and the double-walled casing section 1, forming a double seal effect. This effectively prevents groundwater infiltration and ensures the smooth progress of construction.

[0034] In another embodiment of this invention, the outer surface of the outer cylinder wall is coated with a graphene composite coating. The graphene composite coating has excellent corrosion resistance and wear resistance, effectively protecting the outer cylinder wall from environmental erosion, extending the service life of the casing, and reducing construction costs.

[0035] In another embodiment of this utility model, the flat teeth 21 are arranged in a spiral radial pattern, and chip removal grooves are formed between adjacent flat teeth 21. The depth of the chip removal grooves gradually decreases from the tooth root to the tooth tip. The spiral radial arrangement of the flat teeth 21 can better break up the medium during drilling, and the chip removal grooves facilitate the discharge of the broken chips, avoiding chip accumulation that affects drilling efficiency. The design of the chip removal grooves gradually decreasing in depth from the tooth root to the tooth tip conforms to the chip discharge pattern during drilling, enabling more effective chip removal and improving construction efficiency.

[0036] The working principle of this utility model is as follows: The double-walled sleeve section 1 is composed of an inner cylinder wall and an outer cylinder wall arranged coaxially, and can be made of high-strength materials such as steel. The inner surface of the inner cylinder wall is polished to achieve a mirror finish, thereby reducing internal friction. The upper insertion end 11 of the double-walled sleeve section 1 is provided with a tenon 112, and the lower receiving end 12 is provided with a mortise 122. The size and shape of the tenon 112 and the mortise 122 are matched to achieve good radial positioning.

[0037] The casing shoe 2 is fixedly connected to the receiving end 12 of the bottommost double-walled casing section 1 using a reliable connection method such as welding. The bottom of the casing shoe 2 is provided with hard alloy flat teeth 21, arranged in a spiral radial pattern, forming chip removal grooves between adjacent teeth 21. The depth of the chip removal grooves gradually decreases from the tooth root to the tooth tip. The insertion end 11 of the casing shoe 2 is provided with an annular sealing groove, into which a water-swellable rubber ring is embedded. The size of the rubber ring is adapted to the sealing groove to ensure radial expansion to form a double seal during axial compression.

[0038] The locking device 121 is disposed inside the receiving end 12 and includes components such as a guide slider 1211, a locking pin 1212, a guide groove 1214, a limiting pin 1213, and a limiting baffle 1210. The guide slider 1211 is fixedly installed inside the receiving end 12. The end of the locking pin 1212 is provided with a guide groove 1214, which cooperates with the guide slider 1211 to allow the locking pin 1212 to move laterally within the receiving end 12. When the tenon 112 and mortise 122 of adjacent double-walled sleeve sections 1 are engaged, the locking pin 1212 is pushed to insert into the round hole 111 of the insertion end 11 until the guide slider 1211 contacts the end of the guide groove 1214. At this time, the limiting pin 1213 is inserted into the pin hole 1215 in the through hole 1216 to achieve axial locking. The limiting baffle 1210 is located at the end of the through hole 1216 away from the guide slider 1211 to prevent the locking pin 1212 from falling off.

[0039] During construction, the casing shoe 2 is first installed on the receiving end 12 of the bottom double-wall casing section 1. Then, each double-wall casing section 1 is sequentially engaged through tenons 112 and mortises 122, and axially locked using locking device 121 to form a complete full casing steel cylinder. During drilling, the carbide flat teeth 21 of the casing shoe 2 break up the medium, and the chip removal groove discharges the debris. In the groundwater environment, the water-swellable rubber ring expands to form a double seal to prevent groundwater infiltration. The graphene composite coating on the outer cylinder wall protects the casing from corrosion.

[0040] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A complete casing steel cylinder for construction, characterized in that, include: Multiple coaxially connected double-walled sleeve sections (1) are provided, wherein the double-walled sleeve section is composed of an inner cylinder wall and an outer cylinder wall arranged coaxially; the upper end of the double-walled sleeve section is provided with a plug end (11) with a tenon (112) and the lower end is provided with a receiving end (12) with a tenon (122); adjacent double-walled sleeve sections (1) are radially positioned by the meshing of the tenon and the tenon. The sleeve shoe (2) is fixedly connected to the receiving end (12) of the bottommost double-wall sleeve section (1), and its bottom is provided with carbide flat teeth (21). The locking device (121) is located inside the receiving end and includes a locking pin (1212) that can move laterally and a limiting pin (1213). The locking pin (1212) is inserted into the round hole (111) of the insertion end (11) and then the limiting pin (1213) is inserted into the pin hole (1215) to achieve axial locking.

2. The complete casing steel cylinder for construction according to claim 1, characterized in that, The locking device (121) further includes: The guide groove (1214) and the guide block (1211) located at the end of the locking pin (1212) are axially locked when the locking pin (1212) is pushed to the point where the guide block (1211) contacts the end of the guide groove (1214). The limit pin (1213) is then inserted into the pin hole (1215) in the through hole (1216).

3. The complete casing steel cylinder for construction according to claim 2, characterized in that, The cross-section of the locking pin (1212) is polygonal or a circle with a missing corner.

4. The complete casing steel cylinder for construction according to claim 2, characterized in that, A limit baffle (1210) is provided at the end of the through hole (1216) away from the guide slider (1211).

5. The complete casing steel cylinder for construction according to claim 1, characterized in that, The inner surface of the inner cylinder wall is polished.

6. The complete casing steel cylinder for construction according to claim 1, characterized in that, The insertion end of the sleeve shoe (2) is provided with an annular sealing groove, and a water-swellable rubber ring is embedded in the groove. The rubber ring expands radially after axial compression to form a double seal.

7. The complete casing steel cylinder for construction according to claim 1, characterized in that, The outer surface of the outer cylinder wall is coated with a graphene composite coating.

8. The complete casing steel cylinder for construction according to claim 1, characterized in that, The flat teeth (21) are arranged in a spiral radial pattern, and chip removal grooves are formed between adjacent flat teeth. The depth of the chip removal grooves gradually decreases from the root to the tip of the tooth.

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