A dovetail self-locking connecting device for a pipe curtain steel pipe

Abstract

The utility model discloses a dovetail formula self -locking connecting device of pipe screen steel pipe, including the dovetail female buckle of fixed connection on the first pipe screen steel pipe, still include the dovetail male buckle of fixed connection on adjacent second pipe screen steel pipe, the section of dovetail female buckle is H -shaped and is narrow in top, and the root is wide, the section of dovetail male buckle is trapezoidal and is wide in top, and the root is narrow, and the dovetail female buckle and dovetail male buckle axial sliding connection, the middle board top of dovetail female buckle is provided with spring latch module, and the top of dovetail male buckle is provided with the locking recess for spring latch module carding in correspondence, the utility model discloses through dovetail formula mechanical occlusion and the self -locking structure of spring latch module realizes the instant rigid connection between pipe screen steel pipe, compared with the traditional lock catch device of relying on secondary grouting, the overall bending strength of the utility model is promoted and need not slurry solidification waiting period, and integrated sealing design makes pipe screen system can form reliable waterproof interface in the assembly stage, eliminates the construction interruption and quality hidden danger caused by grouting procedure.

Description

Technical Field

[0001] This utility model relates to the field of pipe curtain pre-support construction technology, and in particular to a dovetail-type self-locking connection device for pipe curtain steel pipes. Background Technology

[0002] With the accelerating pace of urbanization and the increasing saturation of surface space resources, underground space development has become a crucial pathway to overcome the bottlenecks in urban three-dimensional development. In underground space development, trenchless construction technology is widely used in the construction of urban core areas. Among these, the pipe jacking method involves constructing a steel pipe matrix support system between the launching and receiving shafts using micro-jacking units. Specifically, steel pipe units are arranged in a specific spatial arrangement to form a continuous pipe row structure. Adjacent pipe sections are mechanically connected to achieve geometric locking, and waterproof sealing is implemented at the joints, ultimately forming a pipe jacking space with advanced support capabilities. In existing pipe jacking advanced support systems, adjacent pipe sections are often connected by L-shaped or I-shaped interlocking structures. This connection structure lacks sufficient overall bending strength and requires grouting at the joints for sealing, increasing the grout curing time and potentially leading to construction interruptions and safety hazards. Utility Model Content

[0003] The purpose of this utility model is to provide a dovetail-type self-locking connection device for pipe curtain steel pipes in pipe curtain tunneling construction, so as to solve the problems and defects existing in the above-mentioned background technology.

[0004] To achieve the above objectives, the following technical solution is provided:

[0005] A dovetail self-locking connection device for a pipe curtain steel pipe includes a dovetail female buckle fixedly connected to the outer wall of a first pipe curtain steel pipe, and a dovetail male buckle fixedly connected to the outer wall of an adjacent second pipe curtain steel pipe. The cross-section of the dovetail female buckle is H-shaped, narrow at the top and wide at the base. The dovetail female buckle is composed of two side plates welded to a middle plate connecting the side plates. The cross-section of the dovetail male buckle is trapezoidal, wide at the top and narrow at the base. The dovetail female buckle and the dovetail male buckle are axially slidably connected. Spring pin modules are vertically arranged at both ends of the top of the middle plate of the dovetail female buckle, and locking grooves for the spring pin modules to be engaged are correspondingly arranged at both ends of the top of the dovetail male buckle.

[0006] Preferably, the dovetail buckle is composed of two inclined plates welded to the top plate, the inclined plates are welded to the first pipe curtain steel pipe, and the locking groove is formed on the top of the top plate.

[0007] Preferably, the spring pin module includes a disc spring assembly and a steel block, the steel block is fixedly connected to the top of the disc spring assembly, the top of the steel block is provided with a wedge-shaped guide head, and the root of the disc spring assembly is connected to the middle plate.

[0008] Preferably, the middle plate has a positioning hole, and the root of the disc spring assembly is installed in the positioning hole.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1) This utility model achieves an instant rigid connection between pipe curtain steel pipes through the synergistic effect of the dovetail mechanical interlocking and the self-locking structure of the spring pin module. Compared with the traditional locking device that relies on secondary grouting, this utility model improves the overall bending strength and does not require a grout curing waiting period. The integrated sealing design enables the pipe curtain system to form a reliable waterproof interface during the assembly stage, eliminating construction interruptions and quality hazards caused by the grouting process.

[0011] 2) This utility model forms a three-point positioning mechanical balance system through the precise cooperation between the spring pin module and the locking groove, achieving the maintenance-free characteristic of "one-time locking and lifelong stability";

[0012] 3) This utility model has a simple structure and is easy to use. It is connected by a welding-free assembly process and does not require the intervention of special operation personnel, which improves construction efficiency and reduces overall cost. At the same time, the standardized prefabrication of the dovetail lock and the factory pre-assembly of the spring pin module improve the tolerance of on-site construction, making it particularly suitable for the construction of curved sections of pipe curtain in complex strata. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of the connecting body of the self-locking connecting device according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of a single steel pipe in a pipe curtain according to an embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the three-dimensional structure of the dovetail clasp in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the dovetail male buckle according to an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of the spring pin module and the locking groove in the engaged state of an embodiment of this utility model;

[0018] Reference numerals: 1. First tube curtain steel pipe; 2. Second tube curtain steel pipe; 3. Dovetail female buckle; 31. Side plate; 32. Middle plate; 33. Positioning hole; 4. Dovetail male buckle; 41. Inclined plate; 42. Top plate; 5. Spring pin module; 51. Disc spring assembly; 52. Steel block; 53. Wedge-shaped guide head; 6. Locking groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] This utility model embodiment takes the connection of Φ1000×14mm Q355ND weathering steel pipe in urban underground pipe gallery engineering as an example. A dovetail self-locking connection device for pipe curtain steel pipes includes a dovetail female buckle 3 and a dovetail male buckle 4. The axial cross-section of the dovetail female buckle 3 is H-shaped, narrow at the top and wide at the root, while the axial cross-section of the dovetail male buckle 4 is trapezoidal, wide at the top and narrow at the root. The dovetail female buckle 3 and the dovetail male buckle 4 are respectively arranged on the left and right sides of the same pipe curtain steel pipe. The dovetail female buckle 3 on the first pipe curtain steel pipe 1 and the dovetail male buckle 4 on the second pipe curtain steel pipe 2 are mechanically engaged. Simultaneously, a spring pin module 5 is provided at each end of the dovetail female buckle 3, and a corresponding locking groove 6 matching the spring pin module 5 is provided on the dovetail male buckle 4. When the two ends of the dovetail male buckle 4 and the dovetail female buckle 3 are aligned, the spring pin module 5 engages in the locking groove 6 to form a locking structure, preventing axial relative movement between the dovetail female buckle 3 and the dovetail male buckle 4.

[0021] In this embodiment, the dovetail male buckle 4 is composed of two inclined plates 41 welded to a top plate 42. Both the inclined plates 41 and the top plate 42 are made of 30mm thick Q355B steel plate. The ends of the two inclined plates 41 are machined with a single-sided V-shaped bevel (angle 35°). They are fully penetrated and butt-welded to the outer wall of the second pipe curtain steel pipe 2 by gas shielded welding. The weld is inspected by 100% ultrasonic testing, and the penetration depth reaches more than 95% of the plate thickness. The top plate 42 connects the two inclined plates 41, and a locking groove 6 with a size of 50mm×20mm and a hole depth of 15mm is opened on the top of the top plate 42. The locking groove 6 has a rounded corner with a radius of 3mm, and the inner wall of the locking groove 6 is shot peened (surface roughness Ra6.3μm).

[0022] Among them, the dovetail female buckle 3 is made of the same steel plate as the dovetail male buckle 4. The dovetail female buckle 3 is composed of two side plates 31 and a middle plate 32 connecting the two side plates 31. The cross-section is H-shaped with a narrow top and a wide root. The side plates 31 and the outer wall of the first pipe curtain steel pipe 1 are laser-tracked welding process with a welding speed of 0.8 m / min and the interpass temperature is controlled below 150℃. After welding, the residual stress is eliminated by local annealing. Two sets of Φ18±0.02mm positioning holes 33 are precisely machined on the middle plate 32 for installing the spring pin module 5. The positioning holes 33 are formed by a five-axis linkage laser cutting machine. The hole diameter is strictly controlled within the Φ18H7 (+0.018 / 0 mm) tolerance zone, with a verticality requirement of 0.02 mm / m. The inner wall of the positioning hole 33 is electrolytically polished to reduce the surface roughness to Ra0.8 microns. At the same time, a molybdenum disulfide solid lubricating film is coated to reduce frictional resistance.

[0023] The spring pin module 5 includes a disc spring assembly 51 and a steel block 52. In this embodiment, the steel block 52 is made of 60Si2Mn spring steel plate, stamped and formed, with a cross-sectional size of 15mm×8mm. The surface is nitrided (hardness HV650). A wedge-shaped guide head 53 with an inclination angle of 30° is machined at the front end of the steel block 52. The disc spring assembly 51 (preload 8kN±5%) is installed at the tail end of the steel block 52. The steel block 52 and the disc spring assembly 51 are welded together. The disc spring assembly 51 is assembled in the positioning hole 33. During assembly, the spring pin module 5 is first subjected to a -30℃ low-temperature treatment to shrink its outer diameter by 0.03 mm. Then, the HYDROTEST HTM-200 servo hydraulic press is used for pressing. In the initial stage of pressing, a pressure of 5 kN is used to eliminate the fit clearance. In the main pressing stage, a pressure of 10 kN is used to push the spring pin module 5 into the positioning hole 33 at a speed of 2 mm / s. The compression of the disc spring assembly 51 is monitored in real time by a laser displacement sensor to ensure a precise pre-compression of 2.5 ± 0.1 mm.

[0024] In this invention, when the first tube curtain steel pipe 1 and the second tube curtain steel pipe 2 are connected, an intelligent hydraulic alignment system is used for pipe section connection. When the laser rangefinder detects that the distance between the end faces of the two tube curtain steel pipes is ≤3mm, the synchronous jacking device is activated. The trapezoidal inclined surface of the dovetail male buckle 4 contacts the H-shaped guide surface of the dovetail female buckle 3. The contact pressure is monitored in real time during the jacking process. When the dovetail male buckle 4 is pushed to the critical position where the locking groove 6 is aligned with the axis of the spring pin module 5, the energy stored in the disc spring assembly 51 is released instantaneously, pushing the steel block 52 into the locking groove 6 to form a three-point mechanical lock, thereby achieving reliable self-locking.

[0025] It should be noted that this utility model is not only applicable to the connection of straight pipe curtain systems, but also to the connection of angled pipe curtain steel pipes. When using it, it is only necessary to adjust the angle between the dovetail female buckle 3 and the dovetail male buckle 4 on the pipe curtain steel pipe.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dovetail-type self-locking connection device for pipe curtain steel pipes, characterized in that, The system includes a dovetail female buckle (3) fixedly connected to the outer wall of the first pipe curtain steel pipe (1), and a dovetail male buckle (4) fixedly connected to the outer wall of the adjacent second pipe curtain steel pipe (2). The cross-section of the dovetail female buckle (3) is H-shaped with a narrow top and a wide root. The dovetail female buckle (3) is composed of two side plates (31) welded to a middle plate (32) connecting the side plates (31). The cross-section of the dovetail male buckle (4) is trapezoidal with a wide top and a narrow root. The dovetail female buckle (3) and the dovetail male buckle (4) are axially slidably connected. Spring pin modules (5) are vertically installed at both ends of the top of the middle plate (32) of the dovetail female buckle (3). Locking grooves (6) for the spring pin modules (5) to be inserted are correspondingly provided at both ends of the top of the dovetail male buckle (4).

2. The dovetail-type self-locking connection device for pipe curtain steel pipe according to claim 1, characterized in that, The dovetail male buckle (4) is composed of two inclined plates (41) welded to the top plate (42). The inclined plates (41) are welded to the first pipe curtain steel pipe (1). The locking groove (6) is opened on the top of the top plate (42).

3. The dovetail-type self-locking connection device for pipe curtain steel pipe according to claim 2, characterized in that, The spring pin module (5) includes a disc spring assembly (51) and a steel block (52). The steel block (52) is fixedly connected to the top of the disc spring assembly (51). A wedge-shaped guide head (53) is provided at the top of the steel block. The root of the disc spring assembly (51) is connected to the middle plate (32).

4. The dovetail-type self-locking connection device for pipe curtain steel pipe according to claim 3, characterized in that, The middle plate (32) has a positioning hole (33), and the root of the disc spring assembly (51) is installed in the positioning hole (33).

Images