Large-diameter prestressed concrete water pipe

Abstract

The utility model discloses a large-diameter prestressed concrete water delivery pipe, which comprises a steel socket ring at one end and a steel socket ring at the other end, and further comprises a UHPC (Ultra High Performance Concrete) inner pipe and a common reinforced concrete outer pipe, the steel spigot ring and the steel socket ring are fixed with the UHPC inner pipe and the common reinforced concrete outer pipe; a spiral prestressed tendon is wound on the outer circumference of the UHPC inner pipe, and the two ends of the spiral prestressed tendon are anchored in the water conveying pipe; a sealing ring for sealing with the inner circumferential surface of the steel socket ring is arranged on the outer circumference of the steel socket ring; annular grooves used for containing the sealing rings are formed in the two end faces of the common reinforced concrete outer pipe. And the two end surfaces of the UHPC inner pipe are also provided with respective annular grooves for accommodating the sealing rings. The water pipe can omit a steel cylinder, has the characteristics of high strength and compactness, high wear resistance, high impermeability, super corrosion resistance and durability of ultra-high performance concrete, and is relatively low in cost, relatively simple in structure, relatively short in production period and relatively high in production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of precast concrete pipe technology, specifically a large-diameter prestressed concrete water pipe. Background Technology

[0002] Existing large-diameter water transmission pipes generally refer to those with an inner diameter of 1 meter or more, such as those with an inner diameter equal to or greater than 3 meters. These are typically constructed using open-cut or pipe jacking methods. Existing large-diameter prestressed concrete water transmission pipes, also known as prestressed steel cylinder concrete pipes (PCCP pipes), generally involve winding circumferential prestressed steel wires around the outer circumference of a steel cylinder, followed by a layer of ordinary concrete for protection. Some designs even include a layer of ordinary concrete sprayed inside the steel cylinder. The circumferential prestressed steel wires, also known as spiral prestressed steel wires, are anchored at both ends within the concrete. Existing large-diameter prestressed concrete water transmission pipes are generally constructed using open-cut or pipe jacking methods and are typically suitable for high-pressure water transmission pipelines with a water pressure ≥1.2 MPa.

[0003] The existing large-diameter prestressed concrete water pipes have the following shortcomings: 1. Except for the steel spigot and socket rings, the entire length of the water pipe is lined with a steel cylinder, making its structure relatively complex, construction operations relatively cumbersome, and material costs relatively high. 2. Existing large-diameter prestressed concrete water pipes require on-site concrete pouring at the joints of two pipes to stop water flow, which increases the difficulty of construction, delays the construction progress, and relatively affects construction efficiency. 3. Existing large-diameter prestressed concrete water pipes are basically prefabricated from ordinary reinforced concrete, resulting in low strength, thick walls to meet internal and external compressive strength requirements, large volume and heavy weight which hinder transportation and installation, and defects such as concrete spalling and exposed reinforcement corrosion caused by external forces such as chloride ion penetration and water flow erosion, leading to high maintenance costs and short service life. Some pipes use multi-layer composite materials to overcome these defects, such as pouring ordinary reinforced concrete and covering it with plastic pipes or coating the inner wall with an anti-corrosion layer, but these methods are relatively cumbersome to manufacture and have relatively low production efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a large-diameter prestressed concrete water pipe that can eliminate the need for a steel cylinder, has the high strength, density, high wear resistance, high impermeability, super corrosion resistance and durability of ultra-high performance concrete, and has relatively low cost, relatively simple structure, relatively short production and construction cycles, and relatively high production and construction efficiency.

[0005] The technical solution of this utility model is to provide a large-diameter prestressed concrete water pipe, including a steel spigot ring at one end and a steel socket ring at the other end, and also including a UHPC inner pipe and an ordinary reinforced concrete outer pipe; both the steel spigot ring and the steel socket ring are fixed to the UHPC inner pipe and the ordinary reinforced concrete outer pipe; the outer circumference of the UHPC inner pipe is wound with spiral prestressing tendons, and the two ends of the spiral prestressing tendons are anchored inside the large-diameter prestressed concrete water pipe; the outer circumference of the steel spigot ring has a sealing ring for sealing with the inner circumferential surface of the steel socket ring, or the inner circumferential surface of the steel socket ring has a sealing ring for sealing with the outer circumferential surface of the steel spigot ring; both ends of the ordinary reinforced concrete outer pipe have their own annular grooves for accommodating the sealing rings; both ends of the UHPC inner pipe also have their own annular grooves for accommodating the sealing rings.

[0006] With the above structure, the large-diameter prestressed concrete water pipe of this utility model has the following advantages:

[0007] The steel cylinder is eliminated. The inner tube of UHPC is wrapped with spiral prestressed tendons around its outer circumference, and the outer tube is made of ordinary reinforced concrete. This not only enhances the rigidity and strength of the pipe body and protects the spiral prestressed tendons, but also saves material costs, ensures economy, and is fully applicable to high-pressure water pipelines with water pressure greater than or equal to 1.2MPa.

[0008] Because the inner pipe is made of UHPC, or ultra-high performance concrete, this utility model of a large-diameter prestressed concrete water pipe possesses the characteristics of high strength, high density, high wear resistance, high impermeability, ultra-corrosion resistance, and durability of ultra-high performance concrete.

[0009] Furthermore, since the inner pipe is made of ultra-high performance concrete, while the outer pipe, which is relatively less corrosive and withstands relatively low pressure, is made of ordinary reinforced concrete, the end faces of the outer pipe and the steel spigot ring, the outer circumference of the steel spigot ring and the inner circumference of the steel socket ring, and the end faces of the UHPC inner pipe and the UHPC inner pipe are sealed with their respective sealing rings to prevent water from entering. This makes the structure of the large-diameter concrete water pipe of this utility model simple, the water-stopping structure at the joint of the two pipes stable and reliable, and the water-stopping effect good. The manufacturing process is relatively simple and convenient, and there is no need to pour concrete on the water pipe installation site. Its production cycle and construction cycle are relatively short, and its production efficiency and construction efficiency are relatively high. Its material cost is relatively low, its labor cost is relatively low, and its economic efficiency is relatively good, that is, its economic efficiency is 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 current engineering practices that involve painting anti-corrosion epoxy paint on the inner wall of ordinary reinforced concrete water supply pipes and attaching 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 circumference of the steel socket ring has at least one first annular groove for fixing the first sealing ring, or the inner circumference of the steel socket ring has at least one first annular groove for fixing the first sealing ring. With this structure, it is easier to connect the two pipes, 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.

[0012] 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, with the opening facing upwards. 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.

[0013] Furthermore, the cross-section of the second annular groove on each end face of the ordinary reinforced concrete outer pipe is semi-circular, and the cross-section of the second sealing ring that they share is circular. One of the semi-circular second annular grooves is fixed to one of the circular second sealing rings. With the above structure, it is easier to insert the two pipes into each other, the alignment of the sealing ring and the groove is better, the fit is better, and the sealing structure between the end faces of the two pipes after docking is stable and reliable, with good water-stopping effect.

[0014] Furthermore, the cross-section of the third annular groove on each end face of the UHPC inner tube is semi-circular, and the cross-section of the third sealing ring that they share is circular. One of the semi-circular third annular grooves is fixed to a circular third 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, and the sealing structure between the end faces of the inner tubes after the two tubes are joined is stable and reliable, resulting in good water-stopping effect. Moreover, with the above water-stopping structure at the joint of the outer tube, inner and outer annular surfaces, and inner tube, on-site construction is simple, the water-stopping sealing structure is simple, and the water-stopping and sealing effect is good, reliable, and durable.

[0015] Furthermore, each large-diameter prestressed concrete water pipe has a first reinforcing cage inside its UHPC inner tube, consisting of several first longitudinal reinforcing bars and a first spiral reinforcing bar fixed together. With this structure, the UHPC inner tube has higher strength after the addition of the reinforcing cage, better meeting the requirements of high-pressure water pipes with water pressure greater than or equal to 1.2 MPa.

[0016] Furthermore, each large-diameter concrete water pipe has a second reinforcing cage inside its ordinary reinforced concrete outer pipe, which is composed of several second longitudinal reinforcing bars and a second spiral reinforcing bar fixed together. With the above specific structure, the reinforcing cage of the ordinary reinforced concrete outer pipe has higher strength and can further meet the requirements of high-pressure water pipes with water pressure greater than or equal to 1.2 MPa.

[0017] Furthermore, the spiral prestressing tendon is a spiral prestressing steel wire, with each end anchored to two anchorages, which are welded to a steel spigot ring and a steel socket ring, respectively. With this structure, the overall strength of each large-diameter prestressed concrete water pipe is higher. The added strength from the inner and outer steel cages further enhances the overall strength, enabling it to better meet the requirements of high-pressure water pipes with a water pressure greater than or equal to 1.2 MPa.

[0018] Furthermore, the spiral prestressing tendons are spiral prestressed basalt fiber tendons, with each end anchored to two anchorages, which are welded to a steel spigot ring and a steel socket ring, respectively. This structure, with its spiral prestressed basalt fiber tendons, increases the overall strength of each large-diameter prestressed concrete water pipe. Combined with the reinforced steel cage structure of the inner and outer pipes, this further enhances the strength, enabling it to meet the requirements of high-pressure water pipes with a water pressure greater than or equal to 1.2 MPa.

[0019] Furthermore, the outer corner of the steel spigot ring is an arc angle or a chamfer, or the inner corner of the outer end of the steel socket ring is an arc angle or a chamfer. With this structure, the guiding effect is better when the two pipes are joined, resulting in smoother and faster insertion. Attached Figure Description

[0020] Figure 1 This is a front view of the entire pipe structure of a preferred embodiment of the large-diameter prestressed 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).

[0021] Figure 2 yes Figure 1 A magnified structural diagram of A in the middle.

[0022] Figure 3 yes Figure 1 A magnified structural diagram of B in the diagram.

[0023] Figure 4 yes Figure 1 A magnified structural diagram of C (showing a corner of the socket end).

[0024] Figure 5 This is a partial cross-sectional view of the joint between two pipes in a preferred embodiment of the large-diameter prestressed concrete water pipe of this utility model.

[0025] As shown in the figure:

[0026] 1. UHPC inner tube; 11. Socket end; 111. Circular socket tube; 112. Steel socket ring; 1121. First annular groove; 1122. Arc angle; 12. Third annular groove.

[0027] 2. Ordinary reinforced concrete outer pipe, 21. Socket end, 211. Circular hole; 212. Steel socket ring, 22. Second annular groove;

[0028] 31. First sealing ring; 32. Second sealing ring; 33. Third sealing ring;

[0029] 41. Second longitudinal reinforcement; 42. Second spiral reinforcement; 43. First longitudinal reinforcement; 44. First spiral reinforcement; 45. Spiral prestressed tendon. Detailed Implementation

[0030] 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.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown.

[0032] This utility model relates to a large-diameter prestressed concrete water pipe, comprising a steel spigot ring 112 at one end and a steel socket ring 212 at the other end. The large-diameter prestressed concrete water pipe also includes a UHPC inner pipe 1 and a conventional reinforced concrete outer pipe 2.

[0033] The steel spigot ring 112 and the steel socket ring 212 are fixed to the UHPC inner tube 1 and the ordinary reinforced concrete outer tube 2, respectively, by welding to their respective reinforcing cages. The steel socket ring 212 covers the inner circumferential surface of the circular hole 211 of the socket end 21 of the ordinary reinforced concrete outer tube 2, and can be axially inserted into part of the UHPC inner tube 1 and the ordinary reinforced concrete outer tube 2. The steel spigot ring 112 covers the outer circumferential surface of the circular insertion tube 111 of the spigot end 11 of the UHPC inner tube 1, and can be axially inserted into part of the UHPC inner tube 1 and the ordinary reinforced concrete outer tube 2. The outer corner of the outer end of the steel spigot ring 112 is preferably an arc angle 1122 or a chamfer, or the inner corner of the outer end of the steel socket ring is an arc angle or a chamfer. The spigot end 11 can also be called the insertion end. The socket end 21 can also be called the receiving end.

[0034] The outer circumference of the UHPC inner pipe 1 is wound with a helical prestressed tendon 45. Specifically, it can be: except for the axially inserted steel socket ring 112 and the axially inserted steel spigot ring 212, the outer circumference of the UHPC inner pipe 1 is wound with a helical prestressed tendon 45. Or, except for the axially inserted steel socket ring 112 and the axially inserted steel spigot ring 212, a helical prestressed tendon 45 is arranged at the joint between the UHPC inner pipe 1 and the ordinary reinforced concrete outer pipe 2. The two ends of the helical prestressed tendon 45 can be anchored inside the water conveyance pipe.

[0035] The helical prestressed tendon 45 can be a helical prestressed steel wire. The two ends of the helical prestressed tendon 45 are respectively anchored to two anchor devices, and the two anchor devices are respectively welded to the steel socket ring 112 and the steel spigot ring 212. The prestressed steel wire can be a high-strength steel wire.

[0036] Or, the helical prestressed tendon 45 is preferably a helical prestressed basalt fiber tendon. The two ends of the helical prestressed tendon 45 are also respectively anchored to two anchor devices, and the two anchor devices are respectively welded to the steel socket ring 112 and the steel spigot ring 212. The basalt fiber tendon is also called a high-strength basalt tendon.

[0037] There is a sealing ring on the outer circumference of the steel socket ring 112 for sealing with the inner circumferential surface of 212, or there is a sealing ring on the inner circumferential surface of the steel spigot ring for sealing with the outer circumferential surface of the steel socket ring. There are respective annular grooves for accommodating the sealing ring on both end faces of the ordinary reinforced concrete outer pipe 2. There are also respective annular grooves for accommodating the sealing ring on both end faces of the UHPC inner pipe 1. It can also be described from another angle: there are sealing rings and annular grooves for accommodating the sealing rings between the end faces of the two ordinary reinforced concrete outer pipes 2 in the two butt-jointed pipes, between the inner circumferential surface of 212 and the outer circumferential surface of the steel socket ring 112 in the two butt-jointed pipes, and between the end faces of the two UHPC inner pipes 1 in the two butt-jointed pipes. The sealing ring is also called a water stop ring or a sealing ring, and the sealing ring can be a weather-resistant rubber sealing ring. It is not difficult to understand that the central hole of the UHPC inner pipe 1 is the water passage 13 of the large-diameter prestressed concrete water conveyance pipe. To elaborate:

[0038] There is at least one first annular groove 1121 with a first sealing ring 31 fixed on the outer circumference of the steel socket ring 112, or there is at least one first annular groove with a first sealing ring fixed on the inner circumference of the steel spigot ring.

[0039] The cross-section of the first sealing ring 31 is preferably rectangular, and the cross-section of the first annular groove 1121 is preferably a U-shaped cross-section that matches the shape and size of the rectangular first sealing ring 31 and opens upward. <​The cross-section of the second annular groove 22 on each of the two end faces of the ordinary reinforced concrete outer pipe 2 is preferably semi-circular. This can also be described as follows: each of the two ordinary reinforced concrete outer pipes 2 in the two pipes being joined has at least one semi-circular second annular groove 22 on each end face that commonly accommodates a second sealing ring 32. The cross-section of the commonly accommodated second sealing ring is preferably circular, and one of the semi-circular second annular grooves 22 is fixed to a circular second sealing ring 32.

[0041] The cross-section of the third annular groove 12 on each of the two end faces of the UHPC inner tube 1 is preferably semi-circular. This can be described as follows: each of the two UHPC inner tubes 1 in the two tubes being joined has at least one semi-circular third annular groove 12 on each end face that commonly accommodates a third sealing ring 33. The cross-section of the commonly accommodated third sealing ring 33 is preferably circular, and one of the semi-circular third annular grooves 12 is fixed to a circular third sealing ring 33.

[0042] A circular cross-section sealing ring is also called an O-ring. The semi-circular grooves are all matched to the shape and size of the circular sealing ring.

[0043] 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 1121, 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 22, and the diameter of the third sealing ring 33 can also be greater than the diameter of the two closed third annular grooves 12.

[0044] Each large-diameter prestressed concrete water pipe has a first reinforcing cage 1 inside the UHPC inner pipe, which is composed of several second longitudinal reinforcing bars 41 and a second spiral reinforcing bar 42 fixed to each other. This cage can be called the inner reinforcing cage.

[0045] Each large-diameter concrete water pipe has a second steel cage inside its ordinary reinforced concrete outer pipe 2, which is composed of several first longitudinal steel bars 43 and a first spiral steel bar 44 fixed to each other. This cage can be called the outer steel cage.

[0046] Spiral steel bars are also called circumferential steel bars.

[0047] It's easy to understand that UHPC stands for Ultra-High Performance Concrete. 1 meter is 1000 millimeters. 3 meters is 3000 millimeters. The wall thickness of the inner tube of UHPC can be 80-100mm. The wall thickness of the outer tube of ordinary reinforced concrete can be 160-200mm. The length of each pipe, that is, each large-diameter prestressed concrete water pipe, can be 2-5 meters.

[0048] Each large-diameter concrete water pipe can be prefabricated in several stages. First, the UHPC inner pipe 1, after the steel cage and steel ring are fixed, can be prefabricated. Then, spiral prestressed tendons or circumferential prestressed tendons are wound around the outer circumference of the UHPC inner pipe 1 after the strength meets the requirements and the two ends are anchored. Finally, the ordinary reinforced concrete outer pipe 2, after the steel cage and steel ring are fixed, can be prefabricated.

[0049] 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.

[0050] 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 prestressed concrete water pipe, comprising a steel spigot ring at one end and a steel socket ring at the other end, characterized in that: It also includes a UHPC inner pipe and a normal reinforced concrete outer pipe; both the steel spigot ring and the steel socket ring are fixed to the UHPC inner pipe and the normal reinforced concrete outer pipe; a helical prestressed tendon is wound around the outer circumference of the UHPC inner pipe, and both ends of the helical prestressed tendon are anchored in the large-diameter prestressed concrete water delivery pipe; there is a sealing ring on the outer circumference of the steel spigot ring for sealing with the inner circumferential surface of the steel socket ring, or, there is a sealing ring on the inner circumferential surface of the steel socket ring for sealing with the outer circumferential surface of the steel spigot ring; there are respective annular grooves for accommodating the sealing ring on both end faces of the normal reinforced concrete outer pipe; there are also respective annular grooves for accommodating the sealing ring on both end faces of the UHPC inner pipe.

2. The large-diameter prestressed 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 circumference of the steel spigot ring, or, there is at least one first annular groove with a first sealing ring fixed on the inner circumference of the steel socket ring.

3. The large-diameter prestressed concrete water pipe according to claim 2, characterized in that: The cross-section of the first sealing ring is rectangular, and the cross-section of the first annular groove is a U-shaped that matches the shape and size of the rectangular first sealing ring and opens upward.

4. The large-diameter prestressed concrete water pipe according to claim 2, characterized in that: The cross-sections of the respective second annular grooves on both end faces of the normal reinforced concrete outer pipe are semi-circular, and the cross-section of the second sealing ring jointly accommodated is circular, and one of the semi-circular second annular grooves is fixed to one circular second sealing ring.

5. The large-diameter prestressed concrete water pipe according to claim 4, characterized in that: The cross-sections of the respective third annular grooves on both end faces of the UHPC inner pipe are semi-circular, and the cross-section of the third sealing ring jointly accommodated is circular, and one of the semi-circular third annular grooves is fixed to one circular third sealing ring.

6. The large-diameter prestressed concrete water pipe according to claim 1, characterized in that: Inside the UHPC inner pipe of each large-diameter prestressed concrete water delivery pipe, there is a first steel reinforcement cage formed by fixing a number of first longitudinal steel bars and a first helical steel bar to each other.

7. The large-diameter prestressed concrete water pipe according to claim 6, characterized in that: Inside the normal reinforced concrete outer pipe of each large-diameter concrete water delivery pipe, there is a second steel reinforcement cage formed by fixing a number of second longitudinal steel bars and a second helical steel bar to each other.

8. The large-diameter prestressed concrete water pipe according to claim 1, characterized in that: The helical prestressed tendon is a helical prestressed steel wire, and both ends of the helical prestressed tendon are respectively anchored to two anchor fittings, and the two anchor fittings are respectively welded to the steel spigot ring and the steel socket ring.

9. The large-diameter prestressed concrete water pipe according to claim 1, characterized in that:

10. The large-diameter prestressed concrete water pipe according to claim 1, characterized in that: The helical prestressed tendon is a helical prestressed basalt fiber tendon, and both ends of the helical prestressed tendon are respectively anchored to two anchor fittings, and the two anchor fittings are respectively welded to the steel spigot ring and the steel socket ring. The outer corner at the outer end of the steel spigot ring is an arc-shaped corner or a chamfer, or, the inner corner at the outer end of the steel socket ring is an arc-shaped corner or a chamfer.

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