Drain pipe for cast-in-place beam or precast small box beam
Patent Information
- Application Number
- CN202521530374.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-22
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-07-22
AI Technical Summary
[0003]本实用新型的目的在于提供一种用于现浇梁或预制小箱梁的泄水管，有效解决因背景技术中所述缝隙而影响结构耐久性能的问题
[0014]本实用新型通过设置阻水片并且在阻水片上设置多个凸台，从而有利于在渗水路径上增加隔水，并且延长渗水路径，有效提高抗渗能力，隔断渗水通道，解决泄水孔周边混凝土易剥落的问题。
Smart Images
Figure CN224812977U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bridge engineering technology, and in particular relates to a drainage pipe for cast-in-place beams or precast small box girders. Background Technology
[0002] Drainage pipes are a crucial component of the drainage system for cast-in-place beams or precast small box girders (referring to bridges with spans of 15-40m). Drainage pipes are typically evenly distributed along the lower side of the bridge deck, near the crash barriers, according to design requirements. The ends of the drainage pipes are usually flared, while the remaining portion is a uniform cross-section ring. When fixing the drainage pipes, additional reinforcing steel bars are added around them, and the pipes are cast together with the structural layers. Due to the different materials of concrete and drainage pipes, the concrete shrinks over time, leading to gaps between the concrete and the drainage pipes. Furthermore, the interface treatment quality between the bridge structure and the leveling layer, and between the leveling layer and the asphalt layer, is difficult to guarantee, resulting in gaps between the layers. These gaps provide seepage paths for external water sources, deteriorating the service environment of the concrete around the drainage holes and easily causing defects such as steel corrosion and concrete spalling. Therefore, researching a simple, effective, and easy-to-construct and maintain drainage pipe is currently very important and urgent. Utility Model Content
[0003] The purpose of this utility model is to provide a drainage pipe for cast-in-place beams or precast small box girders, which effectively solves the problem of structural durability being affected by the gaps described in the background art.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0005] A drainage pipe for cast-in-place beams or precast small box girders includes an upper drainage pipe and a lower drainage pipe. The bottom end of the upper drainage pipe and the top end of the lower drainage pipe are threadedly connected. The lower drainage pipe is cylindrical. The upper end of the upper drainage pipe is flared outwards in a trumpet shape. The remaining part of the upper drainage pipe is cylindrical.
[0006] A water-blocking plate is connected to the outer wall of the upper drain pipe. The water-blocking plate includes a first water-blocking plate and a second water-blocking plate. The first water-blocking plate is located in the upper middle part of the upper drain pipe, and the second water-blocking plate is located in the lower middle part of the upper drain pipe. The net distance between the first water-blocking plate and the second water-blocking plate is not less than 30 mm. The distance from the outer edge of the first water-blocking plate to the outer wall of the upper drain pipe is not less than 0.5 times the outer diameter of the upper drain pipe, and the distance from the outer edge of the second water-blocking plate to the outer wall of the upper drain pipe is not less than 0.25 times the outer diameter of the upper drain pipe.
[0007] The water-blocking plate is provided with multiple closed protrusions surrounding the upper drain pipe. The height of the outermost protrusion on the water-blocking plate is greater than the height of the other protrusions and not less than the thickness of the water-blocking plate.
[0008] Furthermore, both the first and second water-blocking sheets are annular, and the boss is annular.
[0009] Furthermore, the thickness of the protrusion is the same as the thickness of the water-blocking sheet. The height of the protrusion on the water-blocking sheet that is not the outermost one is not less than 1 times the thickness of the water-blocking sheet, the height of the outermost protrusion on the water-blocking sheet is not less than 1.5 times the thickness of the water-blocking sheet, and the distance between adjacent protrusions on the same water-blocking sheet is not less than 2 cm.
[0010] Furthermore, the threaded connection area of the upper drain pipe is internally threaded, and the threaded connection area of the lower drain pipe is externally threaded.
[0011] Furthermore, the wall thickness of the threaded connection area of the upper and lower drain pipes is 0.5 times the wall thickness of other areas of the upper or lower drain pipes.
[0012] Furthermore, both the upper and lower drain pipes are made of PVC plastic or stainless steel.
[0013] Compared with the prior art, the beneficial technical effects of this utility model are:
[0014] This invention improves water resistance and solves the problem of easy spalling of concrete around drainage holes by setting water-blocking plates and multiple protrusions on the water-blocking plates. Attached Figure Description
[0015] Figure 1 This is a cross-sectional view of the drain pipe of this utility model.
[0016] Figure 2 yes Figure 1 Cross-sectional view of the upper and middle drain pipe.
[0017] Figure 3 yes Figure 1 Cross-sectional view of the middle and lower drain pipe.
[0018] Figure 4 yes Figure 1 A sectional view along line BB.
[0019] Figure 5 yes Figure 1 A cross-sectional view along the CC line.
[0020] Figure 6 This is a cross-sectional view of the drainage pipe of this utility model after it has been installed on a bridge.
[0021] List of reference numerals in the attached diagram: Upper drain pipe -1; Lower drain pipe -2; First water-blocking plate -3; Second water-blocking plate -4; Boss -5; Threaded connection area -6. Detailed Implementation
[0022] Example 1: A drainage pipe for cast-in-place beams or precast small box girders, such as... Figure 1 As shown, the system includes an upper drain pipe 1 and a lower drain pipe 2. The bottom end of the upper drain pipe 1 and the top end of the lower drain pipe 2 are threadedly connected. The lower drain pipe 2 is cylindrical, and the upper end of the upper drain pipe 1 is flared outwards like a trumpet. The remaining part of the upper drain pipe 1 is cylindrical. In this embodiment, to facilitate future replacement of the lower drain pipe 2 and prevent blockage by impurities, the threaded connection area of the upper drain pipe 1 is internally threaded, and the threaded connection area of the lower drain pipe 2 is externally threaded.
[0023] like Figure 1 and Figure 2 As shown, a water-blocking plate is connected to the outer wall of the upper drain pipe 1. The water-blocking plate includes a first water-blocking plate 3 and a second water-blocking plate 4. The first water-blocking plate 3 is located in the upper middle part of the upper drain pipe 1, and the second water-blocking plate 4 is located in the lower middle part of the upper drain pipe 1. The net distance between the first water-blocking plate 3 and the second water-blocking plate 4 should be determined by comprehensive adjustment based on the designed structural layer thickness. Preferably, the net distance between the first water-blocking plate and the second water-blocking plate is not less than 30mm.
[0024] The distance from the outer edge of the first water-blocking plate 3 to the outer wall of the upper drain pipe 1 is not less than 0.5 times the outer diameter of the upper drain pipe 1, preferably 10cm; the distance from the outer edge of the second water-blocking plate 4 to the outer wall of the upper drain pipe 1 is not less than 0.25 times the outer diameter of the upper drain pipe 1, preferably 5cm.
[0025] like Figure 4 and Figure 5 As shown, the water-blocking plate has multiple protrusions 5 that close around the upper drain pipe 1. Figure 1 and Figure 2 As shown, the height of the outermost protrusion 5 on the water-blocking sheet is greater than the height of the other protrusions 5 and not less than the thickness of the water-blocking sheet. In this embodiment, the thickness of the protrusion 5 is the same as the thickness of the water-blocking sheet. The height of the non-outermost protrusion 5 on the water-blocking sheet is not less than 1 times the thickness of the water-blocking sheet, the height of the outermost protrusion 5 on the water-blocking sheet is not less than 1.5 times the thickness of the water-blocking sheet, and the distance between adjacent protrusions 5 on the same water-blocking sheet is not less than 2 cm.
[0026] In this embodiment, the height of the outermost boss 5 on the water-blocking sheet is approximately 5mm, and the height and thickness of the remaining bosses 5 are 2-3mm. The thickness of the water-blocking sheet is generally no greater than 5mm and should not be less than 2mm, preferably 3mm.
[0027] In this embodiment, both the first water-blocking sheet 3 and the second water-blocking sheet 4 are annular, and the boss 5 is annular.
[0028] Both the upper drain pipe 1 and the lower drain pipe 2 are made of PVC plastic or stainless steel, preferably PVC plastic. The wall thickness of the upper drain pipe 1 and the lower drain pipe 2 is generally not less than 7mm. The first water-blocking plate 3 and the second water-blocking plate 4 are respectively heat-fused to the outer wall of the upper drain pipe 1. In this embodiment, all components such as the upper drain pipe 1, the lower drain pipe 2, the first water-blocking plate 3 and the second water-blocking plate 4 can be prefabricated in the factory.
[0029] In this embodiment, as Figure 2 and Figure 3 As shown, the wall thickness of the threaded connection area 6 of the upper drain pipe 1 and the lower drain pipe 2 is 0.5 times the wall thickness of other areas of the upper drain pipe 1 or the lower drain pipe 2. The height of the threaded connection area 6 of the upper drain pipe 1 and the lower drain pipe 2 is approximately 20-30 mm.
[0030] Example 2: An installation method for the drainage pipe of the cast-in-place beam or precast small box girder described in Example 1. First, before pouring, connect the upper drainage pipe 1 and the lower drainage pipe 2, which are connected with water-blocking plates. Then, fix the upper drainage pipe 1 to the steel reinforcement of the structural layer. The first water-blocking plate 3 is located below the top steel reinforcement of the structural layer, and the bottom end of the upper drainage pipe 1 is flush with the bottom end of the structural layer. This facilitates the periodic replacement of the lower drainage pipe 2 according to its service life and damage condition, thereby preventing corrosion of the concrete around the lower drainage pipe 2 due to damage. Finally, as described in Example 1... Figure 6 As shown, the drain pipe is poured together with the structural layer. During the pouring process, care should be taken to prevent the vibrator from damaging the drain pipe.
[0031] If the upper drain pipe 1 is made of stainless steel or other metal materials, then weld the upper drain pipe 1 to the steel bars of the structural layer; if the upper drain pipe 1 is made of PVC plastic, then reserve positioning bars when binding the steel bars of the structural layer, and the components can be directly inserted into the positioning bars during installation.
[0032] This invention is easy to install and has a good water-blocking effect. Utilizing the principle of concrete seepage, this invention adds water-blocking plates that isolate and extend the seepage path, thereby improving impermeability, blocking seepage channels, and solving the problem of easy peeling of concrete around the drainage holes.
[0033] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A drainage pipe for cast-in-place beams or precast small box girders, characterized in that, It includes an upper drain pipe and a lower drain pipe. The bottom end of the upper drain pipe and the top end of the lower drain pipe are connected by a thread. The lower drain pipe is cylindrical. The upper end of the upper drain pipe is flared outwards like a trumpet. The rest of the upper drain pipe is cylindrical. A water-blocking plate is connected to the outer wall of the upper drain pipe. The water-blocking plate includes a first water-blocking plate and a second water-blocking plate. The first water-blocking plate is located in the upper middle part of the upper drain pipe, and the second water-blocking plate is located in the lower middle part of the upper drain pipe. The net distance between the first water-blocking plate and the second water-blocking plate is not less than 30 mm. The distance from the outer edge of the first water-blocking plate to the outer wall of the upper drain pipe is not less than 0.5 times the outer diameter of the upper drain pipe, and the distance from the outer edge of the second water-blocking plate to the outer wall of the upper drain pipe is not less than 0.25 times the outer diameter of the upper drain pipe. The water-blocking plate is provided with multiple closed protrusions surrounding the upper drain pipe. The height of the outermost protrusion on the water-blocking plate is greater than the height of the other protrusions and not less than the thickness of the water-blocking plate.
2. The drainage pipe for cast-in-place beams or precast small box girders according to claim 1, characterized in that, Both the first and second water-blocking sheets are annular, and the boss is annular.
3. The drainage pipe for cast-in-place beams or precast small box girders according to claim 2, characterized in that, The thickness of the protrusion is the same as the thickness of the water-blocking sheet. The height of the protrusion that is not the outermost one on the water-blocking sheet is not less than 1 times the thickness of the water-blocking sheet, and the height of the outermost one on the water-blocking sheet is not less than 1.5 times the thickness of the water-blocking sheet. The distance between adjacent protrusions on the same water-blocking sheet is not less than 2 cm.
4. The drainage pipe for cast-in-place beams or precast small box girders according to claim 3, characterized in that, The threaded connection area of the upper drain pipe is internally threaded, while the threaded connection area of the lower drain pipe is externally threaded.
5. The drainage pipe for cast-in-place beams or precast small box girders according to claim 4, characterized in that, The wall thickness of the threaded connection area of the upper and lower drain pipes is 0.5 times the wall thickness of other areas of the upper or lower drain pipes.
6. The drainage pipe for cast-in-place beams or precast small box girders according to claim 5, characterized in that, Both the upper and lower drain pipes are made of PVC plastic or stainless steel.