Prefabricated bridge floor drainage blind ditch

Abstract

The utility model relates to a prefabricated bridge floor drainage blind ditch which comprises a concrete integral pouring layer, drainage ditches are arranged on at least one side of the concrete integral pouring layer, and a waterproof layer is arranged on the upper surface of the concrete integral pouring layer. A plurality of longitudinal prefabricated drainage boxes are arranged in the drainage ditch, each prefabricated drainage box comprises an outer frame, the top of each outer frame is open and provided with a cover plate, and each outer frame is filled with a gravel layer; water permeable holes are formed in side plates on the periphery of the outer frame, the bottom plate and the cover plate; the prefabricated drainage box further comprises an asphalt layer, and the prefabricated drainage box is covered with the asphalt layer. The prefabricated drainage box is manufactured in a prefabricated mode, the production efficiency is high, the quality is controllable, the construction progress is not affected, gravel does not need to be tamped, vibrated and compacted, asphalt does not need to be cut, excavated and removed, the construction period is shortened, the drainage effect is good, and the road surface is convenient to manage and maintain.

Description

Technical Field

[0001] The utility model relates to the field of road and bridge construction, and particularly relates to a precast bridge deck drainage blind ditch. Background Technique

[0002] For the paving of bridges with roadways, a three-layer form of "asphalt surface course + asphalt base course + concrete integral casting layer" is mostly adopted from top to bottom, and a waterproof layer is provided on the upper surface of the concrete integral casting layer. Due to a large number of voids in the asphalt layer, the rainwater on the road surface will seep down to the surface of the concrete integral casting layer and accumulate between the asphalt layer and the concrete integral casting layer; especially in the southern regions with more rain, when the infiltration water volume is large, it is easy to remain in the asphalt layer to form free water. If it cannot be collected and drained in time, the dynamic water pressure generated by the vehicle load is likely to cause the cohesion of the asphalt aggregate to decrease, and hazards such as asphalt loosening, peeling, and cracking on the bridge deck are likely to occur; therefore, a drainage facility capable of collecting the seepage water on the road surface needs to be set on the bridge deck.

[0003] At present, in bridge engineering, longitudinal blind ditches or longitudinal open ditches are mainly set at the intersection of the bridge sidewalk or guardrail pier and the road surface (the lowest point in the transverse direction of the bridge deck) to collect the seepage water on the road surface, and finally connect to the vertical drainage system. The longitudinal blind ditch is set on the side of the asphalt base course, and the upper part is covered by the asphalt surface course, and pervious granular materials such as gravel are used to collect the seepage water on the bridge deck. However, in the actual construction process, the traditional construction procedure of this scheme is "lay the concrete integral casting layer - lay the waterproof layer - lay the asphalt base course - cut and chisel the asphalt in the blind ditch range after the asphalt base course is completed - lay granular materials such as gravel layer in the blind ditch area - vibrate and compact the gravel with machinery - lay the asphalt surface course", the construction procedure is cumbersome and must be carried out step by step, and the construction period is long.

[0004] In the publicly disclosed patent with the patent number CN209024962U, a steel section is set at the pier to reserve the space for the blind ditch, without cutting and chiseling the asphalt of the lower layer, but the steps of laying and removing the steel section are increased, and filling and vibrating are still required at the construction site.

[0005] In the publicly disclosed patent with the patent number CN218233145U, a precast UHPC ultra-high-strength concrete drainage ditch is provided, the ditch is hollow, small holes are provided on the side to collect seepage water, and a perforated cover plate is provided on the top; the precast structure can be produced in a standardized manner, and the quality control is good, and it can be precast synchronously during bridge construction; however, in this scheme, the soil, stone and garbage on the bridge deck will fall into the ditch through the small holes of the cover plate, reducing its drainage performance, and cleaning requires uncovering each cover plate for cleaning, increasing the maintenance workload, and the concrete cover plate is heavy and inconvenient to operate. Content of the Utility Model

[0006] The purpose of the utility model is to provide a precast bridge deck drainage blind ditch aiming at the deficiencies of the above technical problems, which has good drainage performance, convenient construction, short construction period and is convenient for maintenance.

[0007] The technical solution adopted by the utility model to solve its technical problems is as follows: it includes a concrete monolithic layer, at least one side of the concrete monolithic layer is provided with a drainage ditch, and a waterproof layer is provided on the upper surface of the concrete monolithic layer; a plurality of longitudinally arranged precast drainage boxes are arranged in the drainage ditch, the precast drainage box includes an outer frame, the top of the outer frame is open and provided with a cover plate, and a gravel layer is filled in the outer frame; permeable holes are provided on the four side plates, the bottom plate and the cover plate of the outer frame.

[0008] It further includes an asphalt layer, and the precast drainage box is covered by the asphalt layer.

[0009] Furthermore, it further includes a fiberglass mesh cloth, and the fiberglass mesh cloth is arranged between the outer frame and the gravel layer.

[0010] Furthermore, an installation step is provided at the upper opening of the drainage ditch, and the precast drainage box is installed on the installation step.

[0011] Furthermore, the asphalt layer includes an upper asphalt layer and a lower asphalt layer, the bottom of the precast drainage box is lower than the bottom of the lower asphalt layer, and its top is higher than the top of the lower asphalt layer.

[0012] Furthermore, a stepped receiving platform is provided inside the opening at the top of the outer frame, the cover plate covers the receiving platform, and the top of the cover plate is flush with the top of the outer frame.

[0013] Furthermore, a clip is provided at one end of the bottom plate of the outer frame, and a bayonet adapted to the clip is provided at the other end.

[0014] Furthermore, the outer frame and the cover plate are made of glass fiber reinforced polyphenylene sulfide resin (PPS).

[0015] Furthermore, the length of the outer frame of the precast drainage box is 50 cm - 100 cm.

[0016] Furthermore, a waterproof mortar leveling layer with a thickness of 2 mm - 4 mm is provided between the inner bottom of the drainage ditch and the waterproof layer.

[0017] The beneficial effects of the present utility model are as follows: By arranging a drainage ditch on the concrete monolithic layer and a precast drainage box in the drainage ditch, the precast drainage box can be precast in a factory or on a construction site, enabling standardized production with high production efficiency and controllable quality. The prefabrication of the blind ditch is carried out synchronously with the construction of the bridge structure, without separately occupying the time of the critical construction route. The precast drainage box adopts a structure of an outer frame and a cover plate. After filling the outer frame with crushed stones and covering the cover plate, the precast drainage box is directly installed and assembled in the drainage ditch. There is no need to compact the crushed stone layer again. The construction is convenient. The crushed stones are located inside the outer frame and have no contact with the waterproof layer at the bottom of the drainage ditch. There is no need to compact it during installation either, effectively avoiding damage to the bridge deck waterproof layer. After the installation of the precast drainage box is completed, asphalt is directly laid, without the need to cut and excavate the asphalt after the completion of the lower asphalt layer. The lower asphalt layer and the upper asphalt layer can be continuously constructed, shortening the exposure time of the interface, which is conducive to ensuring the construction quality of the asphalt layer. The precast drainage box is buried in the asphalt layer and has no exposure on the road surface, and will not affect the drainage performance due to the entry of sundries and garbage, making the road maintenance convenient. The water-permeable holes on the precast drainage box enable the precast drainage boxes to communicate with each other, and the water flow can freely flow in the drainage ditch, effectively collecting the road surface seepage water and discharging it from the drainage ditch. The precast drainage box in the present utility model is made by prefabrication, with high production efficiency and controllable quality, does not affect the construction progress, does not require compacting the crushed stones and cutting and excavating the asphalt, saves the construction period, has good drainage effect, and is convenient for road surface management and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present utility model.

[0019] Figure 2 It is a structural schematic diagram of the cover plate.

[0020] Figure 3 It is a front view of the outer frame.

[0021] Figure 4 It is a top view of the outer frame.

[0022] Figure 5 It is a side view of the precast drainage frame.

[0023] In the figure: concrete monolithic layer 1, waterproof layer 2, lower asphalt layer 3, upper asphalt layer 4, outer frame 5, cover plate 6, crushed stone layer 7, fiberglass mesh cloth 8, first water-permeable hole 9, second water-permeable hole 10, waterproof mortar leveling layer 11, clip 12, bayonet 13, drainage ditch 14, third water-permeable hole 15, fourth water-permeable hole 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model. The described embodiments are partial embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] See Figures 1-5A precast bridge deck drainage blind ditch as shown includes a concrete monolithic casting layer 1. At least one side of the concrete monolithic casting layer 1 is provided with a drainage ditch 14, which can be provided on both sides or only on one side. And a waterproof layer 2 is provided on the upper surface of the concrete monolithic casting layer 1. From the concrete monolithic casting layer 1 upwards, it successively includes a waterproof layer 2, an asphalt lower layer 3 and an asphalt upper layer 4. The drainage ditch 14 is arranged at the junction of the bridge sidewalk or the anti-collision guardrail pier and the road surface (the lowest point in the transverse direction of the bridge deck). The drainage ditch 14 is integrally cast with the concrete monolithic casting layer 1. The inner bottom of the drainage ditch 14 is lower than the upper surface of the concrete monolithic casting layer 1. The drainage ditch 14 is communicated with the vertical drainage system of the bridge to drain the water in the drainage ditch 14 to the outside. A plurality of longitudinally arranged precast drainage boxes are provided in the drainage ditch 14. The drainage ditch 14 is used for draining water and installing the precast drainage boxes. The top of the outer frame 5 is open and is provided with a cover plate 6. The inside of the outer frame 5 is filled with a gravel layer 7. The precast drainage boxes are longitudinally arranged in the length direction of the drainage ditch 14 by splicing the ends of the precast drainage boxes end to end. The transverse width thereof is adapted to the width of the drainage ditch 14, so that the gap between the drainage ditch 14 and the precast drainage boxes is small, providing an all-round support for the upper asphalt layer and preventing collapse. Since there is a gravel layer 7 inside, the precast drainage boxes are heavy, and the segmental type is convenient for installation and construction, with stronger overall rigidity, and can ensure the compaction and stability of the gravel layer 7 during transportation, installation and use. The gravel layer 7 forms an internal support for the outer layer materials, jointly forming an integral structure with strength and stiffness, which can effectively support the asphalt upper layer 4. After installation, no further vibration is required, and it can effectively support the upper road surface structure. Water permeable holes are provided on the peripheral side plates, bottom plate and cover plate of the outer frame 5. The water permeable holes on the two side plates of the outer frame 5 are the first water permeable holes 9. The water permeable holes on the cover plate 6 are the second water permeable holes 10. The water permeable holes on the bottom plate of the outer frame 5 are the third water permeable holes 15. The water permeable holes on the front and rear side plates of the outer frame 5 are the fourth water permeable holes 16. The road surface seepage water flows into the drainage ditch 14 through the first water permeable holes 9 and the second water permeable holes 10. And when setting, the lower edges of the water permeable holes on the bottom plate and the two side plates of the precast drainage box are all lower than the top surface of the concrete monolithic casting layer 1, facilitating the seepage water to flow into the precast drainage box. The lower edges of the fourth water permeable holes 16 on the two side plates at both ends of the precast drainage box are flush with the inner bottom of the precast drainage box. The precast drainage boxes connected end to end are communicated with each other. When the water flow is too large during a heavy rainstorm, a drainage channel is formed, enhancing the drainage efficiency of the bridge deck. The precast drainage boxes are covered by the asphalt layer, so that the water on the bridge deck can be drained into the blind ditch. The blind ditch is buried in the asphalt layer and has no exposure on the road surface, and will not be affected by the entry of sundries and garbage, making the road surface maintenance convenient. And the waterproof layer 2 on the concrete monolithic casting layer 1 is closed at the side close to the anti-collision guardrail with a height exceeding the precast drainage box by at least 2 cm, so that there is a waterproof layer 2 within the installation range of the precast drainage box, which can effectively prevent the accumulated water from seeping into the concrete monolithic casting layer 1.

[0026] A precast drainage box is arranged in the drainage ditch 14 of the monolithic concrete layer 1. The precast drainage box can be precast in a factory or at the construction site, enabling standardized production with high production efficiency and controllable quality. The precast blind ditch is carried out synchronously with the construction of the bridge structure, without separately occupying the time of the critical construction route. The precast drainage box adopts a structure of an outer frame 5 and a cover plate 6. After filling gravel into the outer frame 5, the cover plate 6 is covered, and the precast drainage box is directly installed and assembled in the drainage ditch 14. There is no need to vibrate and compact the gravel layer 7 anymore, which is convenient for construction. The gravel is located inside the outer frame 5 and has no contact with the waterproof layer 2 at the bottom of the drainage ditch 14. There is no need to vibrate and compact it during installation either, effectively avoiding damage to the bridge deck waterproof layer 2. After the installation of the precast drainage box is completed, asphalt is directly laid, without the need to cut and excavate the asphalt in the lower asphalt layer 3. The lower asphalt layer 3 and the upper asphalt layer 4 can be continuously constructed, shortening the exposure time of the interface, which is beneficial to ensuring the construction quality of the asphalt layer. The precast drainage box is buried in the asphalt layer and has no exposure on the road surface, and will not affect the drainage performance due to the entry of sundries and garbage, and the road surface maintenance is convenient. The water-permeable holes on the precast drainage box enable the precast drainage boxes to communicate with each other, and the water flow can freely flow in the drainage ditch 14, effectively collecting the road surface seepage water and discharging it from the drainage ditch 14, while meeting the functions of support and drainage. The precast drainage box is made by precast method, with high production efficiency and controllable quality, does not affect the construction progress, does not need to vibrate and compact the gravel and cut and excavate the asphalt, saves the construction period, has good drainage effect, and is convenient for road surface management and maintenance.

[0027] Furthermore, it also includes a fiberglass grid cloth 8, and the fiberglass grid cloth 8 is arranged between the outer frame 5 and the gravel layer 7. The fiberglass grid cloth 8 wraps the gravel layer 7 to prevent the gravel from falling through the water-permeable holes, forming an overall restraint on the gravel and strengthening the structural integrity of the precast drainage box. The fiberglass grid cloth 8 is a commonly used asphalt layer stiffening material in road engineering, can withstand the high-temperature environment during asphalt paving, has strong tensile strength, is not easy to deform, and has pores for water permeability. And the production and application of this material are extensive, with the conditions for mass production or customized procurement.

[0028] Furthermore, an installation step (not marked in the figure) is arranged at the upper opening of the drainage ditch 14, and the precast drainage box is installed on the installation step. The width of the installation step is 1 - 3 cm, generally set to 2 cm, as long as the precast drainage box can be stably installed. The precast drainage box is installed at the upper part of the drainage ditch 14, and the lower part of the drainage ditch 14 forms a blind ditch, so that there is enough drainage space at the lower part of the drainage ditch 2, enhancing the drainage efficiency. To enhance the waterproof tightness between the precast drainage box and the waterproof layer 2, when assembling the precast drainage box, a layer of polyurethane sealant can be first applied on the installation step, and then the precast drainage box is placed in place.

[0029] Furthermore, the bottom of the prefabricated drainage box is lower than the bottom of the asphalt lower layer 3, and its top is higher than the top of the asphalt lower layer 3. The top of the prefabricated drainage box is slightly higher than the top of the asphalt lower layer 3, which can be used as a side formwork during the paving of the asphalt lower layer. It is also convenient to inspect the prefabricated drainage box after the construction of the asphalt lower layer 3. If there is any damage caused by construction operations, it can be dealt with in a timely manner. In actual construction operations, the total height of the prefabricated drainage box is generally set to H + 3 cm, where H is the edge thickness of the asphalt lower layer 3. The bottom of the prefabricated drainage box is 2 cm lower than the bottom of the asphalt lower layer 3, and the top of the prefabricated drainage box is 1 cm higher than the top of the asphalt lower layer 3.

[0030] Furthermore, a stepped receiving platform is provided inside the opening at the top of the outer frame 5, and the cover plate 6 is placed on the receiving platform, and the top of the cover plate 6 is flush with the top of the outer frame 5. This makes the cover plate 6 embedded in the outer frame 5, making the top of the prefabricated drainage box level and facilitating the smooth paving of the asphalt upper layer 4.

[0031] Furthermore, a clip 12 is provided at one end of the bottom plate of the outer frame 5, and a bayonet 13 adapted to the clip 12 is provided at the other end. The bayonet 13 in the previous section cooperates with the clip 12 in the next section, which has a guiding effect and also facilitates the tight lap between segments.

[0032] Furthermore, the outer frame 5 and the cover plate 6 are made of glass fiber reinforced polyphenylene sulfide resin (PPS). Since the prefabricated drainage box is installed first and then the asphalt is paved. The asphalt paving temperature can reach 170°, so the material of the prefabricated drainage box needs to have sufficient heat resistance. Therefore, the outer frame 5 and the cover plate 6 are made of high-temperature resistant glass fiber reinforced polyphenylene sulfide resin (PPS). Glass fiber reinforced polyphenylene sulfide is a thermoplastic resin material, which is high-temperature resistant, has good thermal stability, good strength and toughness, is corrosion-resistant, light in weight, and can be injection molded. It is currently widely used in fields such as electronics, automobiles, and machinery. For example, automotive parts and electrical components with an operating environment temperature exceeding 200°, and mechanical parts and pipelines in high-temperature and strongly corrosive environments.

[0033] Furthermore, the length of the outer frame 5 of the prefabricated drainage box is 50 cm - 100 cm. Since the overall weight of the prefabricated drainage box is relatively large, the outer frame 5 should not be too long, and the appropriate length can be set according to actual needs.

[0034] Furthermore, a waterproof mortar leveling layer 11 with a thickness of 2 mm - 4 mm is provided between the inner bottom of the drainage ditch 14 and the waterproof layer 2. The waterproof mortar leveling layer 11 is generally laid with a thickness of 3 mm. Laying the waterproof mortar leveling layer 11 in the drainage ditch 14 can further enhance the waterproof performance of the flowing water area in the drainage ditch 14, and further level it, facilitating drainage and preventing the formation of accumulated water. Using this process, the main construction sequence of the bridge deck paving layer is: constructing the concrete integral layer 1 - waterproof mortar leveling layer - 11 - constructing the waterproof layer 2 - assembling the blind ditch - laying the asphalt layer.

[0035] The specific embodiments described above further elaborate in detail the purpose, technical solution and beneficial effects of the present utility model. It should be understood that the above description is only the specific implementation method of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the gist of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A precast bridge deck drainage blind ditch, comprising a concrete monolithic layer (1), characterized in that, At least one side of the monolithic concrete layer (1) is provided with a drainage ditch (14), and a waterproof layer (2) is provided on the upper surface of the monolithic concrete layer (1); a plurality of longitudinally arranged precast drainage boxes are provided in the drainage ditch (14), the precast drainage box includes an outer frame (5), the top of the outer frame (5) is open and is provided with a cover plate (6), and a gravel layer (7) is filled in the outer frame (5); water permeable holes are provided on the peripheral side plates, bottom plate and cover plate (6) of the outer frame (5). It further includes an asphalt layer, and the precast drainage box is covered by the asphalt layer.

2. The prefabricated bridge deck drainage blind ditch according to claim 1, wherein It further includes a fiberglass mesh cloth (8), and the fiberglass mesh cloth (8) is arranged between the outer frame (5) and the gravel layer (7).

3. The prefabricated bridge deck drainage blind ditch according to claim 1 or 2, characterized in that, An installation step is provided at the upper opening of the drainage ditch (14), and the precast drainage box is installed on the installation step.

4. The precast bridge deck drainage blind ditch according to claim 3, wherein, The asphalt layer includes an upper asphalt layer (4) and a lower asphalt layer (3), and the bottom of the precast drainage box is lower than the bottom of the lower asphalt layer (3), and its top is higher than the top of the lower asphalt layer (3).

5. The precast bridge deck drainage blind ditch according to claim 4, characterized in that, A stepped receiving platform is provided inside the opening at the top of the outer frame (5), the cover plate (6) is covered on the receiving platform, and the top of the cover plate (6) is flush with the top of the outer frame (5).

6. The precast bridge deck drainage blind ditch according to claim 1, 2, 4 or 5, characterized in that A clip (12) is provided at one end of the bottom plate of the outer frame (5), and a bayonet (13) adapted to the clip (12) is provided at the other end.

7. The prefabricated bridge deck drainage blind ditch according to claim 1, 2, 4 or 5, characterized in that The outer frame (5) and the cover plate (6) are made of glass fiber reinforced polyphenylene sulfide resin.

8. The prefabricated bridge deck drainage blind ditch according to claim 6, wherein, The outer frame (5) and the cover plate (6) are made of glass fiber reinforced polyphenylene sulfide resin.

9. The prefabricated bridge deck drainage blind ditch according to claim 1, 2, 4, 5 or 8, characterized in that The length of the outer frame (5) of the precast drainage box is 50 cm - 100 cm.

10. The prefabricated bridge deck drainage blind ditch according to claim 1, 2, 4, 5 or 8, characterized in that, A waterproof mortar leveling layer (11) with a thickness of 2 mm - 4 mm is provided between the inner bottom of the drainage ditch (14) and the waterproof layer (2).

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