Large-diameter concrete water pipe
By combining the UHPC inner pipe and the ordinary reinforced concrete outer pipe with the sealing ring design, the problems of low strength, poor corrosion resistance and complex construction of large-diameter concrete water pipes are solved, realizing efficient and low-cost high-pressure water pipeline construction.
Patent Information
- Application Number
- CN202520551524.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Existing large-diameter concrete water pipes suffer from problems such as low strength, poor corrosion resistance, complex structure, high construction difficulty, high cost, and low construction efficiency, especially in high-pressure water transmission environments.
The combined structure of UHPC inner tube and ordinary reinforced concrete outer tube, along with sealing rings and reinforcing cages, simplifies the water-stopping design at the joints, eliminates the need for steel cylinders and steel spigot rings, and simplifies the prefabrication and installation process by utilizing the high strength and durability of UHPC.
It has developed a large-diameter concrete water pipe with high strength, corrosion resistance, impermeability and good durability, which simplifies the prefabrication and installation process, reduces costs and construction difficulty, and improves construction efficiency. It is suitable for water pipes with water pressure of about 0.6MPa.
Smart Images
Figure CN223825792U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of precast concrete pipe technology, specifically a large-diameter concrete water pipe. Background Technology
[0002] Existing large-diameter water pipes generally refer to those with an inner diameter of 1 meter or more, such as those with an inner diameter of 3 meters or more. These are typically constructed using open-cut or pipe jacking methods. They are generally suitable for water pipelines with a water pressure not exceeding 6 MPa.
[0003] Traditional large-diameter concrete water pipes are generally prefabricated using ordinary reinforced concrete. However, they have drawbacks such as low strength, thick walls to meet internal and external pressure resistance requirements, large size, and heavy weight, which make transportation and installation difficult. In addition, ordinary reinforced concrete has poor corrosion resistance, which leads to serious quality defects such as concrete spalling and exposed reinforcement corrosion on the inner wall of the pipe after a certain period of use due to external factors such as chloride ion penetration and water flow erosion. This results in a short service life and high maintenance costs.
[0004] In recent years, some technicians have utilized the high strength, density, wear resistance, impermeability, corrosion resistance, and durability of ultra-high performance concrete (UHVPC) to fabricate large-diameter concrete water pipes, representing a significant improvement over existing technologies. However, existing technologies using UHVPC still have their shortcomings. For example, some pipes are entirely constructed with UHVPC, resulting in high costs and poor economic efficiency; others use ordinary reinforced concrete for the main body, with UHVPC applied only to the outer and inner surfaces, leading to relatively complex pipe structures, cumbersome fabrication processes, long production cycles, and high labor costs. Furthermore, all existing technologies using UHVPC share a common drawback: concrete must be poured on-site at the joints of the two pipes to stop water flow, increasing construction difficulty, delaying progress, and negatively impacting on-site construction efficiency. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a large-diameter concrete water pipe with the characteristics of high strength, high density, high wear resistance, high impermeability, super corrosion resistance and durability of ultra-high performance concrete, and with a relatively simple structure, short production cycle, high production efficiency and on-site installation efficiency, and relatively low cost.
[0006] The technical solution of this utility model is to provide a large-diameter concrete water pipe, including a UHPC inner pipe, a UHPC socket end at one end and a UHPC spigot end at the other end, and an ordinary reinforced concrete outer pipe on the outer circumferential surface of the UHPC inner pipe and between the UHPC socket end and the UHPC spigot end; the outer circumference of the circular spigot end has a sealing ring for sealing with the inner circumferential surface of the circular insertion hole of the UHPC socket end, or the inner circumferential surface of the circular insertion hole of the UHPC socket end has a sealing ring for sealing with the outer circumferential surface of the circular spigot end; the end face of the large-diameter portion of the UHPC spigot end and the end face of the large-diameter portion of the UHPC socket end both have their respective annular grooves for accommodating the sealing rings; the outer end face of the circular spigot end and the inner end face of the circular insertion hole of the UHPC socket end both have their respective annular grooves for accommodating the sealing rings.
[0007] With the above structure, the large-diameter concrete water pipe of this utility model has the following advantages:
[0008] Because the socket end, inner pipe and spigot end are all made of UHPC, which is ultra-high performance concrete, the large-diameter prestressed concrete water pipe of this utility model has the characteristics of high strength and density, high wear resistance, high impermeability, ultra-corrosion resistance and durability of ultra-high performance concrete.
[0009] Furthermore, by eliminating the steel cylinder, steel spigot ring, and steel socket ring, and by using ultra-high performance concrete for the inner pipe, socket end, and spigot end, while the outer pipe, which has relatively low corrosivity and pressure resistance on the outer circumference of the UHPC inner pipe and between the UHPC socket end and the UHPC spigot end, is made of ordinary reinforced concrete, the large-diameter end face of the UHPC spigot end at the joint of the two water pipes is sealed with its own sealing ring between the large-diameter end face of the UHPC socket end, between the outer circumference of the circular spigot end and the inner circumference of the circular insertion hole of the UHPC socket end, and between the outer end face of the circular spigot end and the inner end face of the circular insertion hole of the UHPC socket end, making the structure of this utility model of large-diameter concrete water pipe simple, with good pipe strength, and fully applicable to water pipelines with water pressure of around 0.6MPa. The precast casting of the pipe body only requires the first step of casting the UHPC socket end, the UHPC inner pipe, and the UHPC spigot end, and the second step of casting the outer pipe. The precast casting process is simple, convenient, quick, and labor-saving. The water-stopping structure at the joint of the two pipes is stable and reliable, with good water-stopping effect. On-site installation does not require pouring concrete at the water pipeline installation site. Its production and construction cycle is relatively short, its production and construction efficiency is relatively high, its material costs are relatively low, its labor costs are relatively low, and its economic efficiency is relatively good, that is, it is economically ideal.
[0010] Furthermore, since the inner tube of the water supply pipe is made of UHPC, its high strength and density eliminate the need for the current engineering process of painting anti-corrosion epoxy paint on the inner wall of ordinary reinforced concrete water supply pipes and pasting fiberglass and epoxy fiber cloth for corrosion and impact resistance. In comparison, this water supply pipe is more environmentally friendly while improving durability, and its use and maintenance costs are relatively low.
[0011] Furthermore, the outer diameter of the UHPC spigot end is equal to that of both the ordinary reinforced concrete outer pipe and the UHPC socket end. With this structure, the pipe body has better strength, the prefabrication process is more convenient, faster, and less labor-intensive, and the pipe outer diameter is consistent, with a smooth outline and good overall integrity.
[0012] Furthermore, the outer angle of the circular insertion tube at the UHPC socket end and the inner angle of the UHPC are both arc angles; the right angle between the large-diameter portion of the UHPC socket end and the UHPC inner tube is an arc angle, and the inner angle of the large-diameter portion of the UHPC socket end is also an arc angle. With this structure, the guiding properties are better when the two tubes are joined, the insertion is smoother and faster, and the fit between the two tubes is better.
[0013] Furthermore, the outer circumference of the circular insertion tube at the UHPC socket end has at least one first annular groove for fixing a first sealing ring, or the inner circumference of the circular insertion hole at the UHPC socket end has at least one first annular groove for fixing a first sealing ring. With this structure, it is easier to connect the two tubes, the alignment of the sealing ring and the groove is better, the fit is better, the sealing structure between the inner and outer annular surfaces is stable and reliable, and the water-stopping and sealing effect is better.
[0014] Furthermore, the first sealing ring has a rectangular cross-section, and the first annular groove has a cross-section that matches the shape and size of the rectangular first sealing ring and opens upwards in a U-shape. With this structure, the sealing area of the annular surface of the sealing ring after the two pipes are joined is larger, resulting in a better water-stopping and sealing effect.
[0015] Furthermore, the cross-sections of the second annular grooves on both the large-diameter end face of the UHPC spigot and the large-diameter end face of the UHPC socket are semi-circular, and a second sealing ring with a circular cross-section is housed within them. One of the semi-circular second annular grooves is fixed to a circular second sealing ring. With this structure, it is easier to connect the two pipes, the alignment of the sealing ring and the groove is better, and the fit is improved. After the two pipes are joined, the sealing structure between the large-diameter end face of the UHPC spigot and the large-diameter end face of the UHPC socket is stable and reliable, resulting in good water-stopping performance.
[0016] Furthermore, the cross-sections of the third annular grooves on the outer end face of the circular insert at the UHPC socket end and the inner end face of the circular socket at the UHPC socket end are both semi-circular, and a third sealing ring with a circular cross-section is housed in both. One of the semi-circular third annular grooves is fixed to the other of the circular third sealing ring. With this structure, it is easier to connect the two pipes, the alignment of the sealing ring and the groove is better, and the fit is more precise. After the two pipes are joined, the sealing structure between the outer end face of the circular insert at the UHPC socket end and the inner end face of the circular socket at the UHPC socket end is stable and reliable, resulting in good water-stopping effect. Moreover, with this water-stopping structure, on-site construction is simpler, the water-stopping sealing structure is simple, and the water-stopping and sealing effect is better, more reliable, and more durable.
[0017] Furthermore, each large-diameter concrete water pipe contains a reinforcing cage within its UHPC socket end, ordinary reinforced concrete outer pipe, and UHPC spigot end. This cage is composed of several first longitudinal reinforcing bars and a first spiral reinforcing bar that are mutually fixed together. By adopting the above-mentioned specific structure for the reinforcing cage within the ordinary reinforced concrete outer pipe, UHPC socket end, and UHPC spigot end, the strength of the outer pipe, socket end, and spigot end is increased, further meeting the requirements of high-pressure water pipes with a water pressure of approximately 0.6 MPa.
[0018] Furthermore, each large-diameter concrete water pipe has a reinforcing cage inside its UHPC socket end, UHPC inner pipe, and UHPC spigot end, consisting of several second longitudinal reinforcing bars and a second spiral reinforcing bar fixed together. By adopting this structure and adding the reinforcing cage, the strength of the UHPC inner pipe is increased, better meeting the requirements of high-pressure water pipes with a water pressure of approximately 0.6 MPa. Attached Figure Description
[0019] Figure 1 This is a front view of the entire pipe structure of a preferred embodiment of the large-diameter concrete water pipe of this utility model (the drawing method of the middle length is omitted, and the vertical break line in the middle is not shown in the figure: the upper half is a sectional view, and the lower half is an external view).
[0020] Figure 2 yes Figure 1 A magnified structural diagram of A in the diagram.
[0021] Figure 3 yes Figure 1 A magnified structural diagram of B in the diagram.
[0022] Figure 4 yes Figure 1 A magnified structural diagram of C (showing a corner of the socket end).
[0023] Figure 5 This is a partial cross-sectional view of the joint between two pipes in a preferred embodiment of the large-diameter concrete water pipe of this utility model.
[0024] As shown in the figure:
[0025] 1. UHPC pipe body; 11. UHPC inner pipe; 12. UHPC socket end; 121. Circular insert; 1211. First annular groove; 13. UHPC socket end; 131. Circular insertion hole; 14. Second annular groove; 15. Third annular groove; 16. Water passage; 17. First arc angle; 18. Second arc angle.
[0026] 2. Ordinary reinforced concrete outer pipe;
[0027] 31. First sealing ring; 32. Second sealing ring; 33. Third sealing ring;
[0028] 41. First longitudinal reinforcement; 42. First spiral reinforcement; 43. Second longitudinal reinforcement; 44. Second spiral reinforcement. Detailed Implementation
[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown.
[0031] A preferred embodiment of the large-diameter concrete water pipe of this utility model includes a UHPC inner pipe 11, a UHPC socket end 13 at one end and a UHPC spigot end 12 at the other end, and an ordinary reinforced concrete outer pipe 2 between the outer circumference of the UHPC inner pipe 11 and the UHPC socket end 13 and the UHPC spigot end 12. The outer circumference of the circular insertion tube 121 of the UHPC spigot end 12 has a sealing ring for sealing with the inner circumference of the circular insertion hole 131 of the UHPC socket end 13, or the inner circumference of the circular insertion hole of the UHPC socket end has a sealing ring for sealing with the outer circumference of the circular insertion tube of the UHPC spigot end. The end face of the large-diameter portion of the UHPC spigot end 12 and the end face of the large-diameter portion of the UHPC socket end 13 both have respective annular grooves for accommodating the sealing rings. Both the outer end face of the circular insertion tube 121 at the UHPC spigot end 12 and the inner end face of the circular insertion hole 131 at the UHPC socket end 13 have their respective annular grooves for accommodating the sealing ring. The sealing ring, also called a water-stop ring or sealing ring, can be made of weather-resistant rubber. It is easy to understand that the central hole of the UHPC inner tube 11 serves as the water passage 16 for a large-diameter prestressed concrete water pipe. Except for the ordinary reinforced concrete outer tube 2 and the sealing ring, all of the above can be classified as part of the UHPC pipe body 1.
[0032] The outer diameter of the UHPC spigot end 12 can be equal to the outer diameter of the ordinary reinforced concrete outer pipe 2 and the outer diameter of the UHPC socket end 13.
[0033] The outer angle of the circular insertion tube 121 at the UHPC spigot end 12 and the inner angle of the circular insertion hole 131 at the UHPC socket end 13 are both arc angles, which can be collectively referred to as the first arc angle 17. The right angle between the large-diameter portion of the UHPC spigot end 12 and the UHPC inner tube 11 is an arc angle, and the inner angle of the large-diameter portion of the UHPC socket end 13 is also an arc angle, which can be collectively referred to as the second arc angle 18.
[0034] Preferably, at least one first annular groove 1211 with a first sealing ring 31 is fixed on the outer circumference of the circular insertion tube 121 of the UHPC socket end 12, or at least one first annular groove with a first sealing ring fixed on the inner circumferential surface of the circular insertion hole of the UHPC socket end. The cross-section of the first sealing ring 31 is preferably rectangular, and the cross-section of the first annular groove 1211 is preferably a U-shape that matches the shape and size of the rectangular first sealing ring 31 and opens upward.
[0035] The cross-section of the second annular groove 14 on the large-diameter end face of the UHPC spigot end 12 and the large-diameter end face of the UHPC socket end 13 is semi-circular. This can be described as follows: The large-diameter end faces of the UHPC spigot end 12 and the UHPC socket end 13 of the two pipes being joined each have at least one semi-circular second annular groove 14 that commonly accommodates a second sealing ring 32. The cross-section of the commonly accommodated second sealing ring 32 is circular, and one of the semi-circular second annular grooves 14 is fixed to a circular second sealing ring 32.
[0036] The cross-section of the third annular groove 15 on the outer end face of the circular insertion tube 121 of the UHPC socket end 12 and the inner end face of the circular insertion hole 131 of the UHPC socket end 13 is semi-circular. This can be described as follows: the outer end face of the circular insertion tube 112 and the inner end face of the circular insertion hole 131 of the two connected tubes each have at least one semi-circular third annular groove 15 that commonly accommodates a third sealing ring 33. The cross-section of the commonly accommodated third sealing ring 33 is circular, and one of the semi-circular third annular grooves 15 is fixed to a circular third sealing ring 33.
[0037] A circular cross-section sealing ring is also called an O-ring. The semi-circular grooves are matched to the shape and size of the circular sealing ring. The UHPC socket end 13 can also be called the UHPC receiving end. The UHPC spigot end 12 can also be called the UHPC spigot end.
[0038] The sealing ring and groove described above can be fixed by adhesive bonding or countersunk screws. It is easy to understand that, because the sealing ring is to be compressed, the height of the first sealing ring 31 can be greater than the depth of the first annular groove 1211, and the two outer corners of the first sealing ring 31 can be chamfered or rounded to facilitate entry and exit. The diameter of the second sealing ring 32 can be greater than the diameter of the two closed second annular grooves 14, and the diameter of the third sealing ring 33 can be greater than the diameter of the two closed third annular grooves 15.
[0039] Each large-diameter concrete water pipe has a reinforcing cage inside its UHPC socket end 13, ordinary reinforced concrete outer pipe 2, and UHPC spigot end 12. This cage is composed of several first longitudinal reinforcing bars 41 and a first spiral reinforcing bar 42 that are fixed together. This reinforcing cage can be called the outer reinforcing cage.
[0040] Each large-diameter concrete water pipe has a reinforcing cage inside its UHPC socket end 13, UHPC inner pipe 11, and UHPC spigot end 12. This cage is composed of several second longitudinal reinforcing bars 43 and a second spiral reinforcing bar 44 that are fixed together. This reinforcing cage can be called the inner reinforcing cage.
[0041] Spiral steel bars are also called circumferential steel bars.
[0042] It's easy to understand that UHPC stands for Ultra-High Performance Concrete. The wall thickness of the UHPC inner pipe (11) can be 80-100mm. The wall thickness of the ordinary reinforced concrete outer pipe (2) can be 160-200mm. The wall thickness of the UHPC inner pipe (11) plus the UHPC spigot end (12) can be 240-300mm. The wall thickness of the UHPC spigot end (13) plus the UHPC socket end (11) can also be 240-300mm. mm refers to millimeters. The length of each pipe, i.e., each large-diameter concrete water pipe, can be 2-5 meters.
[0043] Each large-diameter concrete water pipe can be prefabricated in two stages. First, the UHPC inner pipe 11, UHPC socket end 13, and UHPC spigot end 12 of the inner steel cage can be prefabricated and fixed. At this time, the outer steel cage can also be pre-fixed to the inner steel cage. After 11, UHPC socket end 13, and UHPC spigot end 12 have initially solidified, the ordinary reinforced concrete outer pipe 2 is prefabricated.
[0044] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.
[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A large-diameter concrete water pipe, characterized in that: It includes a UHPC inner pipe, a UHPC socket end at one end and a UHPC spigot end at the other end, and also includes a normal reinforced concrete outer pipe on the outer circumferential surface of the UHPC inner pipe and between the UHPC socket end and the UHPC spigot end; there is a sealing ring on the outer circumferential surface of the circular insertion pipe of the UHPC socket end for sealing with the inner circumferential surface of the circular socket of the UHPC spigot end, or, there is a sealing ring on the inner circumferential surface of the circular socket of the UHPC spigot end for sealing with the outer circumferential surface of the circular insertion pipe of the UHPC socket end; there are respective annular grooves for accommodating the sealing ring on the end faces of the large-diameter parts of the UHPC socket end and the large-diameter parts of the UHPC spigot end; there are respective annular grooves for accommodating the sealing ring on the outer end face of the circular insertion pipe of the UHPC socket end and the inner end face of the circular socket of the UHPC spigot end.
2. The large-diameter concrete water pipe according to claim 1, characterized in that: The outer diameter dimension of the UHPC socket end is equal to both the outer diameter dimension of the normal reinforced concrete outer pipe and the outer diameter dimension of the UHPC spigot end.
3. The large-diameter concrete water pipe according to claim 1, characterized in that: The outer corner at the end of the circular insertion pipe of the UHPC socket end and the inner corner of the UHPC are both arc-shaped corners; the right angle where the large-diameter part of the UHPC socket end is connected to the UHPC inner pipe is an arc-shaped corner, and the inner corner of the large-diameter part of the UHPC spigot end is also an arc-shaped corner.
4. The large-diameter concrete water pipe according to claim 1, characterized in that: There is at least one first annular groove with a first sealing ring fixed on the outer circumferential surface of the circular insertion pipe of the UHPC socket end, or, there is at least one first annular groove with a first sealing ring fixed on the inner circumferential surface of the circular socket of the UHPC spigot end.
5. The large-diameter concrete water pipe according to claim 4, characterized in that: The cross-section of the first sealing ring is rectangular, and the cross-section of the first annular groove is a C-shaped groove that matches the shape and size of the rectangular first sealing ring and opens upward.
6. The large-diameter concrete water pipe according to claim 4, characterized in that: The cross-sections of the respective second annular grooves on the end faces of the large-diameter parts of the UHPC socket end and the large-diameter parts of the UHPC spigot end are both semi-circular, and the cross-section of a second sealing ring jointly accommodated is circular, and one of the semi-circular second annular grooves is fixed to one circular second sealing ring.
7. The large-diameter concrete water pipe according to claim 6, characterized in that: The cross-sections of the respective third annular grooves on the outer end face of the circular insertion pipe of the UHPC socket end and the inner end face of the circular socket of the UHPC spigot end are both semi-circular, and the cross-section of a third sealing ring jointly accommodated is circular, and one of the semi-circular third annular grooves is fixed to one circular third sealing ring.
8. The large-diameter concrete water pipe according to claim 1, characterized in that: Inside the UHPC socket end, the normal reinforced concrete outer pipe and the UHPC socket end of each large-diameter concrete water delivery pipe, there is a steel reinforcement cage composed of a number of first longitudinal steel bars and a first spiral steel bar fixed to each other.
9. The large-diameter concrete water pipe according to claim 8, characterized in that: Inside the UHPC socket end, the UHPC inner pipe and the UHPC socket end of each large-diameter concrete water delivery pipe, there is a steel reinforcement cage composed of a number of second longitudinal steel bars and a second spiral steel bar fixed to each other.