A pipe cross joint capable of being quickly assembled and spliced on site

Abstract

This invention relates to a pipe cross joint that can be quickly assembled on-site, comprising a connecting fastener (1) consisting of an upper connecting fastener and a lower connecting fastener. The upper and lower connecting fasteners cross-connect a straight pipe and a disconnected pipe together by bolts. A pipe end joint (2) is provided between the connecting fastener (1) and the straight pipe and the disconnected pipe to further enhance the reliability of the pipe connection at the connection node. The connecting fastener (1) has multiple bolt holes, and a nut cap (6) is installed in the bolt holes to strengthen the threaded connection of the bolts and the connecting parts, isolate the bolts from external moisture, prevent bolt corrosion, and improve the durability of the connection joint. The pipe cross joint of this invention, through factory manufacturing and on-site installation of pipe splicing, has the advantages of being unaffected by external weather and other environmental factors, having stable and reliable installation node quality, and fast construction speed, which greatly improves construction efficiency, accelerates construction speed, and effectively reduces project costs.

Description

Technical Field

[0001] This invention relates to the field of pipe connection technology, and more specifically to a pipe cross joint that can be quickly assembled and spliced ​​on site. Background Technology

[0002] As marine engineering expands into deep-sea areas, the wave resistance of HDPE frame structures has become a technological bottleneck limiting their development. Damage to HDPE frames (e.g., gabion floating frames, photovoltaic platform foundations) under high sea states mainly occurs at HDPE pipe welding points, pipe cross-assembly joints, and pipe bends and elbows. At the L-shaped, T-shaped, and cross-shaped intersections of HDPE pipes, on-site connections are typically formed by hot-melt or electrofusion welding with elbows, tees, and cross-shaped joints to the pipe fittings to be connected in each direction. This welding method places high demands on construction conditions, including ambient temperature and humidity, weld cleanliness, welding pressure, pressurization time, cooling time, and worker skill level. Especially in coastal environments with high salt spray, high humidity, and strong winds and sandstorms, it is difficult to guarantee weld quality, leading to reduced strength and toughness of the weld points and insufficient sealing, which in turn affects the overall wind and wave resistance of the entire equipment system. In addition, on-site construction involves manual welding or cutting, which makes it difficult to control the flatness and perpendicularity of the welds compared to mechanical welding and cutting in a factory. This can lead to pipe eccentricity, adversely affecting installation accuracy and pipe stress. Each joint has 3-4 circumferential welds, and on-site welding also suffers from slow construction speed and high construction costs. When the module size is large, the number of welds is substantial, making it unsuitable for large-scale applications.

[0003] For example, Chinese utility model patent CN 219920016 U discloses a modular combined gabion. The cross-shaped nodes of the gabion frame are hinged in both longitudinal and transverse directions via two integral frames and eight pin joints. Each hinged node releases only one degree of freedom in the entire 6-DOF space. Under external dynamic loads such as wind and waves, significant stress concentration occurs in all directions except the hinged degree of freedom, thus requiring high connection strength. However, this node uses only one cantilever plate and pins for connection, resulting in obvious local weak points at the node. Clearly, the tensile, bending, and shear strength of the node is weak, posing a significant challenge to the gabion structure's survivability under harsh sea conditions. Furthermore, because the cross-shaped nodes are hinged in both the transverse and longitudinal directions, rotation occurs at the corners, leading to relatively large deformations between the components connected by the cross joints. Under strong waves and currents, the mesh deformation is relatively large, also significantly impacting upper-level operations. Furthermore, this connection method is only suitable for double-tube cage structures. When a single-tube structure is used, both the cage cross connection and the pedal bracket are single-axis structures. When the pedal is connected at the top, it will cause the pedal to rotate, making it impossible for personnel to work or walk on it, which will result in a higher overall cost for the cage. In addition, the cage's connectors are integral brackets. During cage assembly, the pipes must be passed entirely through the brackets for connection, which requires high installation precision and results in low installation efficiency.

[0004] For example, Chinese invention patent application CN 119532293 A discloses a novel cross-connection structure for pipelines. This structure, applicable to the field of offshore photovoltaic power generation platforms, connects one straight pipe and two disconnected pipes via two staggered cross clamps, secured with bolts. In this connection method, the tensile strength of the disconnected pipes at the connection node is borne solely by the friction between the pipe wall and the connector generated by the bolt tightening. On one hand, the tensile strength provided by friction is limited; on the other hand, HDPE material exhibits significant stress relaxation, and over time, the friction between the pipe wall and the clamps gradually decreases, further reducing the tensile strength of the node. Under external dynamic loads such as wind and waves, the members generate significant axial forces, leading to pull-out failure of the disconnected pipes. In the connection of the straight pipes, the cross clamps are fixed to the main pipe only by the four intersecting bolts at the cross joint. The clamps are pressed tightly against the straight pipe by the tightening force, and the friction of the contact surface restricts the sliding of the clamps along the main pipe's axial direction. The limited number of fastening bolts results in limited tightening force and friction, and a significant stress concentration effect. When the shear force of the vertically disconnected pipe is large, it will cause the connection joint to slide along the axial direction of the straight pipe. Secondly, the connection joint is formed into a whole by bolts. Under the action of dynamic loads such as waves and currents, the HDPE material will experience stress relaxation, leading to bolt loosening and connection failure. Moreover, in the corrosive marine environment, the connecting bolts are at risk of corrosion, reducing the strength of the connection point and affecting the overall strength of the structure. Summary of the Invention

[0005] To address the aforementioned technical deficiencies in existing technologies, this invention aims to provide a pipe cross joint that can be rapidly assembled and spliced ​​on-site. All components are factory-processed and welded, allowing for on-site assembly and splicing without being constrained by construction site conditions. This solves the problems of difficult quality control and slow installation speed associated with on-site welding of HDPE pipes. Furthermore, this pipe connection method enables the modularization and standardization of single-module components in HDPE frame structures. Through the array assembly of cross nodes, multiple offshore floating equipment units (e.g., cage units or floating photovoltaic platform units) can be rapidly assembled, facilitating the rapid construction of multi-module marine equipment clusters. This significantly improves assembly efficiency and reduces construction time, making it suitable for large-scale application. Regarding structural load-bearing performance, it improves the overall strength and wave resistance of the HDPE frame structure. Simultaneously, the use of new nut caps and locking sealant ensures bolt fixation, preventing loosening under wave action and improving the frame's load-bearing capacity under dynamic loads such as waves and currents. It also isolates the bolts from the external environment, enhancing bolt durability. It is of great significance, especially for promoting the large-scale application of HDPE frame structures in marine equipment such as deep-sea aquaculture, offshore floating photovoltaic, tidal energy, and wave energy.

[0006] The solution adopted in this invention is as follows:

[0007] This invention provides a pipe cross joint that can be quickly assembled and spliced ​​on-site, including connecting fasteners. The connecting fasteners include an upper connecting fastener and a lower connecting fastener. The upper connecting fastener and the lower connecting fastener connect a straight pipe and a disconnected pipe or two disconnected pipes together by bolts. Pipe end joints are provided between the connecting fasteners and the straight pipes and disconnected pipes to further enhance the axial tensile and compressive strength of the pipes at the connection nodes. The connecting fasteners have multiple bolt holes, and the bolts in the bolt holes are coated with locking cap glue. Nut caps are installed in the bolt holes to strengthen the threaded connection between the bolts and the connecting parts, isolate the bolts from external moisture, prevent bolt corrosion, and improve the durability of the connection joint.

[0008] Preferably, both the upper and lower connecting fasteners in the connecting fasteners include bidirectional intersecting axes, which correspond to the axes of the pipes that need to be intersected. At each axis position, a symmetrical and fitted circumferential assembly is provided corresponding to the outer contour shape of the connecting pipe. The two sides of the circumferential assembly are horizontally fitted connecting wing plates, and bolt holes are provided on the wing plates.

[0009] In any of the above embodiments, it is preferred that one axis of the bidirectional cross axis of the connecting fastener is used to fix the straight pipe or the broken pipe, and the other axis is used to fix two broken pipes; two reinforcing ribs are provided at the interface between the broken pipe and the straight pipe or the broken pipe, and bolt holes are provided on the reinforcing ribs perpendicular to the cross connection surface, so as to fasten the upper and lower connecting fasteners together by bolts; the circumferential assembly of the connecting fastener is provided with a transverse connection groove and a longitudinal connection groove inside.

[0010] In any of the above solutions, it is preferred that the connecting fastener is a two-way shaft structure. Each directional shaft can be connected to a single-axis connecting fastener corresponding to a single-tube main frame, or each directional shaft can be connected to a double-axis connecting fastener corresponding to a double-tube main frame. A footboard can be connected to the upper part. When using a single-tube main frame, the problems of rotation and instability of the footboard supported by a single tube in the past can be solved, meeting the needs of personnel to work and walk on it. Compared with the double-tube structure, the overall cost of equipment such as cages can be reduced.

[0011] In any of the above embodiments, it is preferred that the interior of the circumferential assembly of the connecting fastener is arc-shaped, elliptical arc-shaped, square, rhomboid, or polygonal.

[0012] In any of the above embodiments, it is preferred that the pipe end joint is a tubular cavity structure with a closed end plate and a cavity; the outer wall of the pipe end joint is provided with an annular protrusion, which cooperates with the transverse connecting groove and the longitudinal connecting groove in the connecting fastener; the pipe end of the pipe end joint is a welding surface, and the welding surface is hot-melt welded with the first transverse pipe to be spliced, the second transverse pipe to be spliced, or the longitudinal pipe to be spliced ​​in the factory workshop.

[0013] In any of the above embodiments, it is preferred that the nut cap is a cylindrical cavity structure with an open end and a closed end, the top of the open end is a conical surface, and the central part is a cavity; the overall outer diameter of the nut cap matches the bolt hole on the connecting fastener.

[0014] In any of the above solutions, it is preferred that the connecting fasteners are cross-connected with straight pipes or disconnected pipes to form a cross-shaped cross-connection structure, a T-shaped cross-connection structure, or an L-shaped cross-connection structure; four cross-shaped cross-connection structures are spliced ​​together to form an HDPE frame structure module. By adding cross joints and splicing structures in the longitudinal and transverse directions of the HDPE frame structure module, multiple floating unit modules can be quickly formed, so that the pipe cross joint of the present invention can be used for various HDPE frame marine floating equipment such as multi-module unit aquaculture cages and floating photovoltaic support foundations.

[0015] In any of the above embodiments, it is preferred that the materials of the pipe cross joints include HDPE, steel structures, and polymer composite materials.

[0016] In summary, the pipe cross joint of the present invention, which allows for rapid on-site assembly and splicing, has the following advantages: The pipe splicing method, which combines factory manufacturing with on-site assembly and installation, replaces the hot-melt welding method for on-site elbows, tees, or cross joints of HDPE pipes. This solves the construction problems of traditional HDPE frame structures in coastal areas with high salt spray, where on-site welding is not required, resulting in poor quality control and low node reliability. It is unaffected by external weather and other environmental factors, has stable and reliable installation node quality, and fast construction speed, greatly improving construction efficiency, accelerating construction speed, and effectively reducing project costs. After splicing, the pipe connection node can fully transmit axial force, shear force, bending moment, and torque, achieving the main... The frame pipes are subjected to continuous force transmission, and the stress on each contact surface of the nodes is uniform, avoiding the stress concentration effect at the bolted connections of the aforementioned hinged connections. This greatly improves the node strength, ensures the reliability of the connection nodes, and thus improves the overall structural strength and enhances the survivability of the frame structure under harsh sea conditions. The bending moment at the joint can be completely transmitted, thereby reducing the relative deformation between the components connected by the cross joint and ensuring the working conditions of the upper part under strong waves and currents. There is no need to pass the entire pipe through the support for connection, which improves the efficiency of installation. The connector is a two-way shaft structure, with a single-axis connecting fastener corresponding to a single pipe main frame or a double-axis connecting fastener corresponding to a double pipe main frame in each direction. The upper part of the pipe can be connected to a footboard, providing reliable stability and meeting the needs of personnel working and walking on it, thereby reducing the overall cost of equipment such as cages. By reinforcing the ribs, on the one hand, the force-bearing area of ​​the connecting fasteners between the two arc-shaped components is increased, reducing stress concentration effects; on the other hand, the multiple bolts on the reinforcing ribs can disperse the clamping force, avoiding stress concentration, and further enhancing the clamping force between the pipe and the connecting fasteners, increasing the anti-slip friction between the pipe and the fasteners, and improving the joint bearing capacity. The interlocking of the annular protrusions of the pipe end connectors with the transverse and longitudinal connecting grooves of the connecting fasteners enables the transmission of axial force in the pipe, further increasing the axial tensile and compressive bearing capacity of the joints; through the use of new types of screws… The sealing of the caps and locking caps ensures the bolt's fixing ability, solving the problem of stress relaxation in HDPE material and bolt loosening under dynamic loads such as wind and waves, thus improving the frame's load-bearing capacity under such loads. Furthermore, the use of caps and locking caps isolates the bolts from external moisture, preventing corrosion and improving the durability of the joints. The connection method of this invention facilitates the modularization and standardization of the frame structure. Through the array assembly of cross nodes, it enables the rapid modular assembly of multiple marine floating equipment units, such as cage units or floating photovoltaic platform units, facilitating the rapid construction of multi-module marine equipment clusters. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a preferred embodiment of a pipe cross joint that can be quickly assembled on-site according to the present invention.

[0020] Figure 2 This is a schematic diagram of a preferred embodiment of the pipe cross joint that can be quickly assembled on-site according to the present invention.

[0021] Figure 3 This is a structural schematic diagram of a preferred embodiment of the pipe cross joint that can be quickly assembled on-site according to the present invention.

[0022] Figure 4 For the pipe cross joint that can be quickly assembled and spliced ​​on site according to the present invention Figures 1-3 The diagram shows a structural schematic of the connecting fastener in the preferred embodiment.

[0023] Figure 5 For the pipe cross joint that can be quickly assembled and spliced ​​on site according to the present invention Figures 1-3 A schematic diagram of the pipe end joint in the preferred embodiment is shown.

[0024] Figure 6 For the pipe cross joint that can be quickly assembled and spliced ​​on site according to the present invention Figures 1-3 The diagram shows a structural schematic of the nut cap in the preferred embodiment.

[0025] Figure 7 For the pipe cross joint that can be quickly assembled and spliced ​​on site according to the present invention Figure 1 The diagram shows a practical application of the preferred embodiment. Explanation of icon numbers: Connecting fastener 1, transverse connecting groove 11, longitudinal connecting groove 12, bolt hole 13, reinforcing rib 14, wing plate 15, pipe end joint 2, annular protrusion 21, pipe welding surface 22, cavity 23, closed end plate 24, first transverse pipe to be spliced ​​3, second transverse pipe to be spliced ​​4, longitudinal pipe to be spliced ​​5, nut cap 6, conical surface 61, end closing plate 62, central cavity 63, male and female plug mating joint 7, cross-shaped cross joint A, single HDPE frame module B. Detailed Implementation

[0026] The following description is merely exemplary and not intended to limit this disclosure, its application, or its uses. The specific embodiments of the pipe cross joint of the present invention, which allows for rapid on-site assembly, are further described below with reference to the accompanying drawings.

[0027] Example 1:

[0028] like Figure 1The diagram shows a preferred embodiment of the pipe cross joint that can be quickly assembled and spliced ​​on-site according to the present invention. The pipe cross joint that can be quickly assembled and spliced ​​on-site according to the present invention includes a connecting fastener 1, which comprises an upper connecting fastener and a lower connecting fastener. The upper and lower connecting fasteners connect a straight pipe and a disconnected pipe, or two disconnected pipes, together using bolts. A pipe end connector 2 is provided between the connecting fastener 1 and the straight pipe or disconnected pipe to further enhance the axial tensile and compressive strength of the pipe at the connection node. The connecting fastener 1 has multiple bolt holes 13, the bolts inside the bolt holes 13 are coated with locking cap adhesive, and a nut cap 6 is installed inside the bolt holes 13 to strengthen the threaded connection between the bolts and the connecting parts, isolate the bolts from external moisture, prevent bolt corrosion, and improve the durability of the connection joint.

[0029] The working principle of the pipe cross joint of the present invention, which can be quickly assembled and spliced ​​on site, is as follows: In the force transmission mechanism of the longitudinal pipe 5 to be spliced ​​at the connection node, the main pipe is directly connected at the connection node, achieving complete through-transmission of the force on the pipe fittings without reduction in the strength of the main pipe direction, thus ensuring the node strength. Regarding the force transmission at the node of the first transverse pipe 3 and the second transverse pipe 4 to be spliced, on the one hand, the first transverse pipe 3 and the second transverse pipe 4 to be spliced ​​achieve a wrapping and compression effect on the first transverse pipe 3, the second transverse pipe 4 to be spliced, and the longitudinal pipe 5 to be spliced ​​through the bolts and fasteners on the connecting fastener 1. This transmits the force and torque on the pipe to the connecting fastener 1, which in turn transmits it to the pipe on the other side, achieving complete through-transmission of axial force, shear force, and bending moment. On the other hand, the engagement between the annular protrusion 21 of the pipe end joint 2 and the groove inside the connecting fastener 1 further enhances the axial tensile and compressive strength of the pipe at the connection node. The assembled joints can fully transmit axial force, shear force, bending moment, and torque, achieving continuous force transfer to the HDPE main frame pipe fittings. Furthermore, the stress is uniform across all contact surfaces of the joint, ensuring its strength. Simultaneously, the uniform stress on all contact surfaces between the pipe and connector at cross-connection joints effectively avoids stress concentration effects and improves joint reliability.

[0030] The assembly process of the pipe cross joint of the present invention, which can be quickly assembled and spliced ​​on site, is as follows:

[0031] First, the connecting fastener 1, pipe end connector 2, and bolt cap 6 are manufactured and the pipes are cut in the factory. Then, the first horizontal pipe 3 to be spliced, the second horizontal pipe 4 to be spliced, and the pipe end connector 2 are heat-fused or electrofused in the factory to form pipe sections. The welded pipe sections and connecting parts are then transported to the construction site. Next, the pipe end connector 2 of the longitudinal pipe 5 to be connected to the first horizontal pipe 3 and the second horizontal pipe 4 to be spliced ​​is placed into the lower connecting fastener in sequence. The annular protrusion 21 of the pipe end connector 2 is engaged with the groove inside the connecting fastener 1. The upper connecting fastener 1 is fastened and the upper and lower connecting fasteners 1 are tightened with bolt fasteners. Finally, locknut glue is applied to the bolt holes, the bolts are tightened, and the nut cap 6 is hammered in to seal the bolt holes. Finally, the rapid on-site assembly splicing of the cross-shaped cross connection node of the frame is completed.

[0032] participate Figure 4 As shown, the pipe cross joint according to the present invention can be quickly assembled and spliced ​​on site. Figures 1-3 The diagram shows a structural schematic of the connecting fastener in the preferred embodiment.

[0033] In this embodiment, the upper and lower connecting fasteners of the connecting fastener 1 both include bidirectional intersecting axes, which correspond to the axes of the pipes that need to be intersected. At each axis position, a symmetrical and fitted circumferential assembly is provided corresponding to the outer contour shape of the connecting pipe. The two sides of the circumferential assembly are horizontally fitted connecting wing plates 15, and bolt holes 13 are provided on the wing plates 15.

[0034] In this embodiment, the bidirectional cross-axis of the connecting fastener 1 has a one-way axis circumferential assembly that fixes a straight pipe or a broken pipe, and a two-way circumferential assembly that fixes two broken pipes. Two reinforcing ribs 14 are provided at the interface between the broken pipe and the straight or broken pipe. The reinforcing ribs 14 have bolt holes perpendicular to the cross-connection surface, thereby fastening the upper and lower connecting fasteners together with bolts. The circumferential assembly of the connecting fastener 1 has a transverse connecting groove 11 and a longitudinal connecting groove 12 inside. The connecting fastener 1 has two reinforcing ribs 14 at the interface of the circumferential assemblies, increasing the stress-bearing area of ​​the connecting fastener between the two circumferential assemblies and reducing stress concentration effects. Simultaneously, the fastening bolts on the reinforcing ribs 14 further increase the stress-bearing area of ​​the connecting fastener between the two circumferential assemblies, reducing stress concentration effects.

[0035] In this embodiment, the connecting fastener 1 is a two-way shaft structure. When a single-tube main frame is used, a footboard is connected to the upper part, which makes the whole structure have reliable stability and meets the needs of personnel to work and walk on it, thereby reducing the overall cost of equipment such as cages.

[0036] In this embodiment, the inside of the circumferential assembly of the connecting fastener 1 is arc-shaped, elliptical arc-shaped, square, rhomboid, or polygonal.

[0037] See next. Figure 5 As shown, the pipe cross joint according to the present invention can be quickly assembled and spliced ​​on site. Figures 1-3 A schematic diagram of the pipe end joint in the preferred embodiment is shown.

[0038] In this embodiment, the pipe end connector 2 is a tubular cavity structure with a closed end plate 24 and a cavity 23; the outer wall of the pipe end connector 2 is provided with an annular protrusion 21, which cooperates with the transverse connecting groove 11 and the longitudinal connecting groove 12 in the connecting fastener 1; the pipe end of the pipe end connector 2 is a welding surface 22, and the welding surface 22 is hot-melt welded with the first transverse pipe 3 to be spliced, the second transverse pipe 4 to be spliced, or the longitudinal pipe 5 to be spliced ​​in the factory workshop.

[0039] like Figure 6 As shown, the pipe cross joint according to the present invention can be quickly assembled and spliced ​​on site. Figures 1-3 The diagram shows a structural schematic of the nut cap in the preferred embodiment.

[0040] In this embodiment, the nut cap 6 is a cylindrical cavity structure with an open end and a closed surface 62 at the other end. The top of the open end is a conical surface 61, and the center part is a cavity 63. The overall outer diameter of the nut cap 6 matches the bolt hole on the connecting fastener 1.

[0041] Regarding the corrosion protection of fastening bolts, the tapered surface on the nut cap guides the nut cap 6 into the bolt hole 13 of the fastener 1. The outer diameter of the cylindrical part of the nut cap 6 is slightly larger than the inner diameter of the bolt hole to achieve an interference fit. Locking glue is applied to the outside of the bolt to strengthen the threaded connection between the bolt and the fastener, solve the problem of bolt loosening caused by the stress relaxation characteristics of HDPE material, improve the load-bearing capacity of the frame under dynamic loads such as wind and waves, isolate the bolt from external moisture, and prevent bolt corrosion.

[0042] See last for reference. Figure 7 As shown, the pipe cross joint according to the present invention can be quickly assembled and spliced ​​on site. Figure 1 The diagram shows a practical application of the preferred embodiment.

[0043] In this embodiment, the connecting fastener 1 is cross-connected with a straight pipe or a disconnected pipe to form a cross-shaped cross-connection structure A; four cross-shaped cross-connection structures A are spliced ​​together to form an HDPE frame structure module B. By adding cross joints and splicing structures in the longitudinal and transverse directions of the HDPE frame structure module B, multiple floating unit modules can be quickly formed, so that the pipe cross joint of the present invention can be used for various HDPE frame marine floating equipment such as multi-module unit aquaculture cages and floating photovoltaic support foundations.

[0044] In this embodiment, the materials of the pipe cross joint include HDPE, steel structure, and polymer composite materials.

[0045] The above-mentioned cross-connection type can be used for cross-single pipe, cross-multiple pipe, cross-single pipe and multiple pipe, and a matching ring assembly is set according to the number of connecting pipes.

[0046] Example 2:

[0047] See Figure 2 The diagram shows a preferred embodiment of the pipe cross joint that can be quickly assembled on-site according to the present invention.

[0048] In this embodiment, the connecting fastener 1 is cross-connected with the longitudinal pipe 5 to be spliced ​​and the second transverse pipe 4 to be spliced ​​to form a T-shaped cross-connection structure. Based on the cross-shaped cross-connection structure, removing the circumferential assembly and the transverse pipe to be connected on one side allows it to be used for connecting T-shaped cross joints.

[0049] During assembly, the connecting fastener 1, pipe end connector 2, and bolt cap 6 are first fabricated and the pipes are cut in the factory. Then, the second transverse pipe 4 to be spliced ​​and the pipe end connector 2 are heat-fused or electrofused in the factory to form a pipe section. The welded pipe section and connecting parts are then transported to the construction site. Next, the pipe end connector 2 of the longitudinal pipe 5 to be connected and the second transverse pipe 4 to be spliced ​​are placed into the lower connecting fastener. The annular protrusion 21 of the pipe end connector 2 is engaged with the groove inside the connecting fastener 1. The upper connecting fastener 1 is fastened, and the upper and lower connecting fasteners 1 are tightened with bolt fasteners. Finally, locknut glue is applied to the outside of the bolts and screwed into the bolt holes. The nut cap 6 is hammered in to seal the bolt holes, thus completing the rapid on-site assembly of the T-shaped cross connection node of the frame.

[0050] The specific structure of the connecting fastener 1, the pipe end connector 2, and the nut cap 6 is described in Example 1 and will not be repeated here.

[0051] Example 3:

[0052] like Figure 3 The diagram shows a preferred embodiment of the pipe cross joint that can be quickly assembled on-site according to the present invention.

[0053] In this embodiment, the connecting fastener 1 is cross-connected with the straight pipe and the disconnected pipe to form a T-shaped cross-connection structure. Based on the T-shaped cross-connection structure, the main pipe side is connected to the pipe end connector 2, and the annular protrusion 21 on the end connector 2 is inserted into the longitudinal connecting groove 12 of the connecting fastener 1. This can be used for the connection of L-shaped cross connectors.

[0054] During assembly, the connecting fastener 1, pipe end connector 2, and bolt cap 6 are first fabricated and the pipes are cut in the factory. Then, the second transverse pipe 4 to be spliced ​​and the pipe end connector 2 are heat-fused or electrofused in the factory to form a pipe section. The welded pipe section and connecting parts are transported to the construction site. Next, the pipe end connector 2 of the longitudinal pipe 5 to be connected and the second transverse pipe 4 to be spliced ​​are placed into the lower connecting fastener. The annular protrusion 21 of the pipe end connector 2 is engaged with the groove inside the connecting fastener 1. The upper connecting fastener 1 is fastened and the upper and lower connecting fasteners 1 are tightened with bolt fasteners. Finally, locking glue is applied to the outside of the bolt and screwed into the bolt hole. The nut cap 6 is used to seal the bolt hole, and the rapid on-site assembly of the L-shaped cross connection node of the frame is completed.

[0055] The specific structure of the connecting fastener 1, the pipe end connector 2, and the nut cap 6 is described in Example 1 and will not be repeated here.

[0056] Those skilled in the art will readily understand that the pipe cross joint of the present invention, which can be quickly assembled and spliced ​​on-site, includes any combination of the parts described in this specification. Due to space limitations and for the sake of brevity, these combinations are not described in detail here, but after reading this specification, the scope of the present invention, which consists of any combination of the parts constituted by this specification, is self-evident.

Claims

1. A pipe cross joint that can be quickly assembled and spliced ​​on-site, comprising a connecting fastener (1), the connecting fastener (1) comprising an upper connecting fastener and a lower connecting fastener, wherein the upper connecting fastener and the lower connecting fastener cross-connect a straight pipe and a disconnected pipe or a disconnected pipe and a disconnected pipe together by bolts, characterized in that: A pipe end connector (2) is provided between the connecting fastener (1) and the straight pipe and the disconnected pipe; the connecting fastener (1) has multiple bolt holes (13), the inner bolts of the bolt holes (13) are coated with locking cap glue, and the bolt holes (13) are filled with nut caps (6).

2. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 1, characterized in that: The upper and lower connecting fasteners in the connecting fastener (1) both contain bidirectional intersecting axes, which correspond to the axes of the pipes that need to be intersected. At each axis position, a symmetrical and fitted circumferential assembly is set in accordance with the outer contour shape of the connecting pipe. The two sides of the circumferential assembly are horizontally fitted connecting wing plates (15), and bolt holes (13) are set on the wing plates (15).

3. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 2, characterized in that: The connecting fastener (1) is a two-way shaft structure. Each direction shaft is a single-axis connecting fastener that connects to a single-tube main frame or a double-axis connecting fastener that connects to a double-tube main frame.

4. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 2, characterized in that: The bidirectional cross axis of the connecting fastener (1) is used to fix a straight pipe or a broken pipe in one direction and to fix two broken pipes in the other direction. Two reinforcing ribs (14) are provided at the interface between the broken pipe and the straight pipe or the broken pipe. Bolt holes perpendicular to the cross connection surface are provided on the reinforcing ribs (14). The circumferential assembly of the connecting fastener (1) is provided with a transverse connecting groove (11) and a longitudinal connecting groove (12).

5. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 2, characterized in that: The inside of the circumferential assembly of the connecting fastener (1) is circular arc, elliptical arc, square, rhombus or polygon.

6. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 1, characterized in that: The pipe end connector (2) is a tubular cavity structure with a closed end plate (24) and a cavity (23); the outer wall of the pipe end connector (2) is provided with an annular protrusion (21), which cooperates with the transverse connecting groove (11) and the longitudinal connecting groove (12) in the connecting fastener (1); the pipe end of the pipe end connector (2) is a welding surface (22).

7. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 1, characterized in that: The nut cap (6) is a cylindrical cavity structure with an open end and a closed surface (62) at the other end. The top of the open end is a conical surface (61), and the center part is a cavity (63). The overall outer diameter of the nut cap (6) matches the bolt hole on the connecting fastener (1).

8. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in claim 1, characterized in that: The connecting fastener (1) is cross-connected with the straight pipe and the disconnected pipe to form a cross-connection structure (A), a T-type cross-connection structure, or an L-type cross-connection structure; four cross-connection structures (A) are spliced ​​together to form an HDPE frame structure module (B). Multiple floating unit modules are quickly formed by adding cross joints and splicing structures in the longitudinal and transverse directions of the HDPE frame structure module (B).

9. The pipe cross joint that can be quickly assembled and spliced ​​on site as described in any one of claims 1-8, characterized in that: The materials used for the pipe cross joints include HDPE, steel structures, and polymer composite materials.

Images