Glass fiber reinforced plastic large pipe jacking pipe suitable for high pressure working condition

Abstract

The utility model provides a kind of glass steel large pipe jacking of adaptation high pressure working condition, including glass steel main body, upper embedded framework, lower embedded framework, A support rib plate and B support rib plate, the glass steel main body is wound and is formed on the upper embedded framework and lower embedded framework, A support rib plate and B support rib plate are installed and arranged between the upper embedded framework and lower embedded framework;The utility model arc mirror image framework is adapted glass steel winding, improves the bonding strength and is resistant to high pressure deformation;Rib plate separates multi-pipeline space, and additional construction is avoided to reduce cost and save time;Rib plate and framework arc welding into frame, can be transmitted to prevent cracking, and also can resist stratum settlement and keep stable.

Description

Technical Field

[0001] This utility model belongs to the field of pipe jacking technology, and in particular relates to a large fiberglass pipe jacking system adapted to high-pressure working conditions. Background Technology

[0002] With the acceleration of urbanization and increased development of underground space in my country, projects such as municipal integrated pipe corridors, high-pressure water / gas pipelines, and cross-river industrial pipelines place a dual demand on pipe jacking technology: "high pressure bearing capacity + intensive laying of multiple pipelines." Currently, traditional pipe materials and structures in pipe jacking projects suffer from the following technical challenges: Reinforced concrete pipes have poor impermeability and corrosion resistance. They are prone to cracking and leakage under long-term exposure to high-pressure media (such as industrial wastewater and high-pressure gas) above 2MPa. Their large weight also increases the jacking resistance. Although ordinary fiberglass jacking pipes have the advantages of being lightweight and corrosion resistant, they lack an effective internal support structure. Under the external pressure of high pressure (≥2.5MPa) or deep burial strata (soil thickness >15m), their circumferential stiffness is insufficient, and they are prone to radial deformation, making it difficult to meet the requirements for long-term stable operation.

[0003] The poor spatial adaptability of multi-pipeline shared compartments in integrated utility tunnel projects requires the simultaneous laying of multiple types of pipelines such as power, communication, water supply, and gas supply. Traditional solutions either adopt "single pipe, single compartment" multi-jacking construction (repeatedly excavating working shafts, which is costly and time-consuming) or add metal supports to separate the space in a single jacking pipe later (the support and pipe body have poor fit, which can easily cause stress concentration, damage the integrity of the pipe body, and the metal support has poor corrosion resistance, which increases maintenance costs). It is impossible to balance "space utilization" and "structural stability".

[0004] Therefore, it is essential to invent a large fiberglass jacking pipe that can adapt to high-pressure working conditions. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a large fiberglass jacking pipe adapted to high-pressure working conditions, including a fiberglass body, an upper embedded skeleton, a lower embedded skeleton, an A support rib and a B support rib. The fiberglass body is wound and formed on the upper and lower embedded skeletons, and the A support rib and the B support rib are installed between the upper and lower embedded skeletons.

[0006] Preferably, the upper embedded skeleton and the lower embedded skeleton are mirror images of each other, and both have the same structure, being arc-shaped.

[0007] Preferably, the upper and lower embedded skeletons are located above and below the formed fiberglass body, respectively, and the inner side of the fiberglass body is divided into three laying spaces by the A support rib and the B support rib.

[0008] Preferably, the space between the A support rib and the B support rib is a small pipeline laying space, and the two sides are large pipeline laying spaces, with the small pipeline laying space located between the two large pipeline laying spaces.

[0009] Preferably, the A support rib and the B support rib are installed together with the upper embedded frame and the lower embedded frame by arc welding. The axes of the A support rib and the B support rib are parallel to each other and perpendicular to the ground.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The upper and lower embedded skeletons of this invention adopt an arc-shaped structure and are distributed in a mirror image, which perfectly matches the circumferential winding process of the fiberglass body. During winding, the glass fiber can be evenly distributed along the surface of the arc-shaped skeleton, ensuring that the resin and fiber are fully impregnated, and greatly improving the bonding strength between the skeleton and the body. At the same time, the arc-shaped skeleton itself has excellent radial force dispersion ability, which, together with the circumferential reinforcement characteristics of the fiberglass body, effectively avoids radial deformation and cracking under high pressure, and meets the long-term operation requirements of high-pressure conditions.

[0011] This utility model features A and B support ribs vertically connected between the upper and lower arc-shaped frames, precisely dividing the inner side of the fiberglass main body into "1 small pipeline laying space + 2 large pipeline laying spaces": the small space can accommodate small-diameter pipelines such as power and communication lines, while the large space can accommodate large-diameter pipelines such as high-pressure water and gas transmission lines, achieving physical isolation and classified laying of multiple types of pipelines without the need for additional multi-pipe individual jacking construction; at the same time, the partition structure is an integrated design, avoiding damage to the pipe body caused by the later installation of supports, significantly reducing project costs and construction period.

[0012] The A and B support ribs of this utility model are connected to the upper and lower skeletons by arc welding to form a frame support system of "arc skeleton-vertical ribs": on the one hand, the vertical ribs can transmit the longitudinal thrust during the jacking process, avoiding longitudinal cracking caused by the fiberglass body bearing the jacking force alone; on the other hand, the frame structure can enhance the resistance of the jacking pipe to uneven ground settlement, ensuring the accuracy of pipeline laying and structural stability. Attached Figure Description

[0013] Figure 1 This is a partial cross-sectional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the skeleton of this utility model.

[0015] In the picture: Fiberglass main body 1, upper embedded frame 2, lower embedded frame 3, A support rib 4, B support rib 5. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0017] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0018] As attached Figure 1 To be continued Figure 2 As shown: This utility model provides a large fiberglass jacking pipe adapted to high-pressure working conditions, comprising a fiberglass body 1, an upper embedded skeleton 2, a lower embedded skeleton 3, an A support rib 4, and a B support rib 5. The fiberglass body 1 is wound and formed on the upper embedded skeleton 2 and the lower embedded skeleton 3. The A support rib 4 and the B support rib 5 are installed between the upper embedded skeleton 2 and the lower embedded skeleton 3. The upper embedded skeleton 2, the lower embedded skeleton 3, the A support rib 4, and the B support rib 5 constitute the skeleton structure of the jacking pipe.

[0019] Furthermore, the upper embedded skeleton 2 and the lower embedded skeleton 3 are mirror images of each other, with identical structures. Both are made of the same glass fiber reinforced composite material (or carbon fiber-glass fiber hybrid material) as the fiberglass body 1, forming an arc-shaped structure. The convex arc surface of the upper embedded skeleton 2 faces upwards, while the convex arc surface of the lower embedded skeleton 3 faces downwards. The radii of curvature of both are perfectly matched with the inner wall curvature radius of the fiberglass body 1 (error ≤ 2mm), ensuring that the fiber layer of the fiberglass body 1 can tightly adhere to the skeleton surface during winding, forming a seamless integrated structure. This mirror design allows the upper and lower skeletons to evenly distribute the radial pressure (including internal and external pressure) from the fiberglass body 1, avoiding force concentration in one direction. It also provides a symmetrical installation reference for the A support rib 4 and the B support rib 5, ensuring the mechanical balance of the overall structure.

[0020] Furthermore, the upper embedded skeleton 2 and the lower embedded skeleton 3 are located on the upper inner side and lower inner side of the formed fiberglass body 1, respectively, and are centrally symmetrically distributed along the central axis of the fiberglass body 1. The top of the upper embedded skeleton 2 coincides with the top vertex of the inner wall of the fiberglass body 1, and the bottom of the lower embedded skeleton 3 coincides with the bottom vertex of the inner wall of the fiberglass body 1. The arc length of the skeleton is 1 / 3 to 1 / 2 of the circumference of the inner wall of the fiberglass body 1 (adapted according to pipe diameter, 1 / 3 is preferred for jacking pipes above DN2000mm), ensuring that the skeleton can effectively cover the main stress area of ​​the fiberglass body 1. The A support rib 4 and the B support rib 5 are vertically connected between the upper and lower skeletons, dividing the annular space inside the fiberglass body 1 into three independent laying spaces. The total cross-sectional area of ​​the three spaces is equal to the internal cross-sectional area of ​​the fiberglass body 1, and the boundary of each space is formed by the inner wall of the fiberglass body 1 and the surface of the rib, ensuring the sealing of the space and the structural integrity.

[0021] Furthermore, the small pipeline laying space formed between support rib 4 (A) and support rib 5 has a width of 200-400mm (adjustable according to pipeline specifications, suitable for pipelines with a diameter ≤150mm), and its height matches the inner diameter of the fiberglass main body 1 (minus the thickness of the upper and lower skeletons). It can accommodate small-diameter pipelines such as power cables, communication optical cables, and small oil pipelines, and a 100-150mm maintenance passage is reserved within the space for easy future maintenance. Two large pipeline laying spaces are formed between the outer side of support rib 4 and the inner wall of the fiberglass main body 1, and between the outer side of support rib 5 and the inner wall of the fiberglass main body 1, respectively. The width of each large pipeline laying space is 2-3 times that of the small pipeline laying space (suitable for pipelines with a diameter of 300-800mm), capable of accommodating large-diameter pipelines such as high-pressure water pipes, medium-pressure gas pipes, and industrial wastewater pipes. The inner walls of the large spaces are all smoothed (roughness ≤0.01mm) to reduce frictional resistance when pipelines are inserted. The space for laying small pipelines is located between the spaces for laying two large pipelines, forming a symmetrical layout of "narrow diameter in the middle and thick diameter on both sides" to ensure that the overall structure is subjected to balanced forces.

[0022] Furthermore, both support rib 4 (A) and support rib 5 (B) are made of high-strength fiberglass (axial tensile strength ≥100MPa). Their top ends are fixedly connected to the inner arc-shaped surface of the upper embedded frame 2, and their bottom ends are fixed to the inner arc-shaped surface of the lower embedded frame 3 via arc welding. Resin-based welding rods of the same material as the frame are used during welding, and the welding bevel is designed with an arc transition radius of 50-80mm to ensure a smooth connection between the weld and the arc-shaped surface of the frame, avoiding stress concentration. The axes of support rib 4 (A) and support rib 5 (B) are parallel to each other and perpendicular to the ground (verticality deviation ≤0.5°). This vertical arrangement allows the ribs to directly transmit the longitudinal force between the upper and lower frames (such as the thrust during jacking), while evenly distributing the lateral earth pressure on the fiberglass main body 1 to the upper and lower frames, enhancing the overall structure's shear resistance. In addition, the thickness of the ribs is 1.2-1.5 times the wall thickness of the fiberglass main body 1 (≥20mm), ensuring that they will not bend or deform under high-pressure conditions.

[0023] The working principle is as follows: First, the fiberglass body 1 forms an integrated structure with the upper embedded skeleton 2 and the lower embedded skeleton 3 through a winding process. The curved surface characteristics of the arc skeleton are used to convert the external soil pressure and the internal medium pressure into circumferential tension, which is evenly borne by the fiber winding layer of the fiberglass body, thus realizing radial bearing under high pressure conditions.

[0024] Secondly, the mirror-symmetric design of the upper embedded frame 2 and the lower embedded frame 3, together with the vertical connection of the A support rib plate 4 and the B support rib plate 5, forms a closed frame system. This system not only disperses the radial load through the arc-shaped frame, but also transmits the longitudinal jacking force through the vertical rib plates, thus avoiding overload on a single structure and improving the overall resistance to deformation.

[0025] Furthermore, the A support rib 4 and the B support rib 5 form a physical separation in the frame system, dividing the inner space of the fiberglass main body into three independent areas. Through the symmetrical layout of "narrow diameter in the middle and thick diameter on both sides", the weight and pressure of pipelines of different specifications are evenly distributed in the skeleton and main structure, avoiding structural damage caused by local load concentration.

[0026] Finally, the arc-shaped welding joints between the frame and the ribs are designed with a smooth transition to eliminate the risk of stress concentration, ensuring that all components work together under the thrust of jacking construction and the dynamic pressure of long-term use. This maintains the overall stability of the pipeline and ensures the functional integrity of the space for laying multiple pipelines.

[0027] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A large fiberglass jacking pipe adapted to high-pressure working conditions, characterized in that, It includes a fiberglass body (1), an upper embedded frame (2), a lower embedded frame (3), an A support rib (4), and a B support rib (5). The fiberglass body (1) is wound and formed on the upper embedded frame (2) and the lower embedded frame (3). The A support rib (4) and the B support rib (5) are installed between the upper embedded frame (2) and the lower embedded frame (3).

2. The large fiberglass jacking pipe adapted to high-pressure working conditions as described in claim 1, characterized in that: The upper embedded skeleton (2) and the lower embedded skeleton (3) are mirror images of each other, and both have the same structure, which is an arc-shaped structure.

3. A large fiberglass jacking pipe adapted to high-pressure working conditions as described in claim 2, characterized in that: The upper embedded skeleton (2) and the lower embedded skeleton (3) are located above and below the formed fiberglass body (1), respectively. The inner side of the fiberglass body (1) is divided into three laying spaces by the A support rib (4) and the B support rib (5).

4. A large fiberglass jacking pipe adapted to high-pressure working conditions as described in claim 3, characterized in that: The space between the A support rib (4) and the B support rib (5) is a small pipeline laying space, and the two sides are large pipeline laying spaces. The small pipeline laying space is located between the two large pipeline laying spaces.

5. A large fiberglass jacking pipe adapted to high-pressure working conditions as described in claim 4, characterized in that: The A support rib (4) and B support rib (5) are installed together with the upper embedded frame (2) and the lower embedded frame (3) by arc welding. The axes of the A support rib (4) and B support rib (5) are parallel to each other and are perpendicular to the ground.

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