Highway bridge assembled vertical downspout structure and installation method thereof

Abstract

This invention belongs to the field of bridge engineering technology, specifically disclosing a prefabricated vertical drainage pipe structure for highway bridges. It includes an outer drainage pipe pre-embedded in the concrete beam and an inner drainage pipe installed within it. The lower end of the outer drainage pipe extends from the bottom of the concrete beam, and the lower end of the inner drainage pipe extends from the lower end of the outer drainage pipe. The inner wall of the outer drainage pipe has a supporting boss, and the outer wall of the inner drainage pipe has a protrusion, which is adhesively connected to the supporting boss. Multiple reinforcing bosses are provided on the outer wall of the outer drainage pipe, and the outer wall of the outer drainage pipe and the reinforcing bosses are pre-embedded and fixed in the concrete beam. This invention also discloses an installation method for the prefabricated vertical drainage pipe for highway bridges. This invention eliminates the need to disassemble the drainage hole template, preventing damage to the incompletely hardened concrete layer. Furthermore, the later installation involves assembling from top to bottom of the bridge, saving time and effort and ensuring safe operation.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and in particular relates to a prefabricated vertical drainage pipe structure for highway bridges and its installation method. Background Technology

[0002] A crucial aspect of highway bridge design is the drainage and seepage prevention within the bridge deck waterproofing system. Poorly implemented waterproofing can lead to water accumulation and seepage, severely impacting the bridge's durability. Water accumulation not only affects driving safety and comfort but also causes seepage. When seepage occurs, the water that seeps into the concrete beams freezes and expands in winter, causing damage. In summer, the high temperatures soak the asphalt concrete pavement, leading to loosening. Furthermore, the seeping water corrodes the reinforcing steel, eroding the beam structure and shortening the bridge's lifespan.

[0003] In order to effectively reduce the impact of water damage on the durability and service life of highway bridges, and to address the shortcomings of existing bridge deck waterproofing systems, it is necessary to set up a reasonable drainage pipe structure to drain the accumulated water on the bridge in a timely manner while inhibiting the occurrence of seepage.

[0004] Currently, bridge deck waterproofing systems generally employ vertical drainage pipes, which offer smooth drainage and are easy to install. These drainage pipes are integral structures made of PVC round pipes, directly installed at pre-drainage holes at the junction of the bridge's side retaining walls and the bridge deck to promptly drain accumulated water. The installation method typically involves pre-embedding straight-hole cast iron (or plastic) drainage hole templates at designated locations during the precast concrete bridge construction. Before the concrete has fully hardened, the templates are removed, and the integral drainage pipe structure is fixed to the removed template locations. Finally, grout is used to fill the gaps between the drainage pipe and the drainage hole.

[0005] The defects in the above-mentioned drainage pipe structure and installation method include:

[0006] 1. When dismantling the pre-embedded drainage hole formwork, it is usually not easy to determine the degree of hardening of the concrete around the drainage hole formwork. Dismantling the formwork can easily damage the concrete layer that has not yet fully hardened, resulting in gaps remaining between the drainage pipe and the drainage hole formwork after the grout is filled. This can easily lead to water seepage and affect the durability of the bridge.

[0007] 2. PVC integral round pipes are easily affected by factors such as temperature and light, which can cause them to age and become brittle, leading to cracks in the drain pipes. Water can then seep directly into the beam concrete through the cracks, causing damage to the beam concrete.

[0008] 3. Workers need to go down under the bridge and install the drainage pipes at the reserved drainage holes from bottom to top, which is not only time-consuming and labor-intensive, but also affects the safety of construction workers. Summary of the Invention

[0009] One objective of this invention is to provide a modular vertical drainage pipe structure for highway bridges, which effectively solves the technical defects of existing drainage pipe structures and their installation methods.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] A prefabricated vertical drainage pipe structure for highway bridges includes an outer drainage pipe pre-embedded in the concrete beam and an inner drainage pipe installed inside the outer drainage pipe. The lower end of the outer drainage pipe extends from the bottom of the concrete beam, and the lower end of the inner drainage pipe extends from the lower end of the outer drainage pipe.

[0012] The inner wall of the drain pipe has a supporting boss, and the outer wall of the drain pipe has a protrusion that connects with the supporting boss.

[0013] Furthermore, multiple reinforcing bosses are provided around the outer wall of the drain pipe, and the outer wall of the drain pipe and the reinforcing bosses are embedded and fixed in the beam concrete.

[0014] Furthermore, the inner drain pipe is provided with a plurality of downward-sloping drain holes evenly arranged around the inner drain pipe, located in the cavity below the junction of the protrusion and the supporting protrusion.

[0015] Furthermore, the longitudinal section of the supporting boss is trapezoidal, and the reinforcing boss is arranged around the outer wall of the drain pipe.

[0016] Furthermore, both the outer drain pipe and the inner drain pipe are made of PE or PP-R plastic material and manufactured in one piece using a specific mold.

[0017] Furthermore, the interior of the drain pipe is approximately funnel-shaped, divided into an upper part, a middle part, and a lower part from top to bottom. The middle part is an inverted frustum structure, while the upper and lower parts are both cylindrical structures with the inner diameter of the upper part being larger than that of the lower part. The bottom end of the lower part is obliquely pointed.

[0018] Furthermore, the protrusion is arranged around the center.

[0019] Furthermore, the outer diameter of the lower part is not greater than the inner diameter of the supporting boss of the drain pipe.

[0020] Furthermore, the protrusion is adhesively bonded to the contact surface of the supporting boss.

[0021] Another objective of this invention is to provide an installation method for a prefabricated vertical drainage pipe structure for highway bridges, effectively addressing the technical deficiencies of existing drainage pipe structures and their installation methods.

[0022] An installation method for a prefabricated vertical drainage pipe for highway bridges, applied to the prefabricated vertical drainage pipe structure for highway bridges as described in the above embodiment, includes the following steps:

[0023] S1. The external drain pipe is pre-embedded in the beam concrete during the concrete pouring process;

[0024] S2. After the concrete of the beam has completely hardened, the inner drain pipe is assembled from top to bottom into the pre-embedded outer drain pipe from above the bridge, so that the protrusion is supported on the supporting platform, and the contact surface between the protrusion and the supporting platform is bonded with sealant.

[0025] The beneficial technical effects of this invention are:

[0026] (1) The assembled vertical drainage pipe structure for highway bridges of the present invention allows workers to more conveniently install the drainage pipe from top to bottom on the bridge. The inner drainage pipe only needs to have its protrusion supported on the pre-embedded inner wall support of the outer drainage pipe, and the joint surfaces of the two are bonded together with sealant to fix the later-installed inner drainage pipe. Considering that gaps may remain after the sealant is applied, allowing water to enter the cavity formed by the protrusion on the outer wall of the inner drainage pipe and the support support on the inner wall of the outer drainage pipe, a drainage hole is provided below the protrusion on the outer wall of the inner drainage pipe to promptly drain the water from the cavity.

[0027] (2) The assembled vertical drainage pipe structure for highway bridges of the present invention can not only drain the water on the bridge surface in a timely manner under normal conditions, but also prevent water from seeping into the beam concrete through the pre-embedded drainage outer pipe when the inner drainage pipe breaks, thus inhibiting the impact of water on the durability of the bridge.

[0028] (3) The pre-embedded drainage outer pipe and the later installed drainage inner pipe of the present invention are both made of PE or PP-R material, which has better weather resistance and is not prone to rupture due to aging and brittleness. Attached Figure Description

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 This is a cross-sectional structural schematic diagram of the assembled vertical drainage pipe for highway bridges according to the present invention.

[0031] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the central drainage pipe.

[0032] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure of the inner drain pipe. Detailed Implementation

[0033] Example 1

[0034] like Figure 1 As shown, a prefabricated vertical drainage pipe structure for highway bridges includes an outer drainage pipe 2 pre-embedded in the concrete beam 1 and vertically installed, and an inner drainage pipe 3 installed later within the outer drainage pipe 2. The lower end of the outer drainage pipe 2 extends from the bottom of the concrete beam 1, and the lower end of the inner drainage pipe 3 extends from the lower end of the outer drainage pipe 2. The inner wall of the outer drainage pipe 2 has a supporting boss 4, and the outer wall of the inner drainage pipe 3 has a protrusion 5, which connects with the supporting boss 4. Preferably, the contact surfaces of the protrusion 5 and the supporting boss 4 are bonded together with sealant.

[0035] In this embodiment, the structure of the drain pipe 2 is as follows: Figure 2 As shown, the outer drain pipe 2 is a nearly cylindrical structure running vertically through the pipe, with a thickness of 5-10 mm. Two reinforcing protrusions 6 are arranged around the outer wall of the outer drain pipe 2; preferably, the two reinforcing protrusions 6 are located at the upper and lower parts of the outer drain pipe 2, respectively. The reinforcing protrusions 6 provide a more stable fixation of the outer drain pipe 2 within the concrete beam 1. A supporting protrusion 4, used to support the protrusion 5, is arranged around the inner wall of the outer drain pipe 2, and the longitudinal section of the supporting protrusion 4 is trapezoidal.

[0036] In this embodiment, the structure of the drain inner pipe 3 is as follows: Figure 3 As shown, the thickness of the inner drain pipe 3 is 5-10 mm, and the interior of the inner drain pipe 3 is approximately funnel-shaped. The interior of the inner drain pipe 3 is divided into an upper part A, a middle part B, and a lower part C, which run from top to bottom. The middle part B has an inverted frustum structure, while the upper part A and lower part C are both cylindrical structures, with the inner diameter of the upper part A being larger than that of the lower part C. The bottom end of the lower part C is obliquely pointed. The protrusion 5 is arranged around the middle part B, with its outer edge coinciding with the extended surface of the outer wall of the upper part A. The bottom end of the protrusion 5 is connected to the supporting boss 4. In the cavity formed below the position where the protrusion 5 of the inner drain pipe 3 connects to the supporting boss 4 of the outer drain pipe 2, multiple downward-sloping drain holes 7 are evenly distributed around the outer wall of the inner drain pipe 3 to drain water from the cavity. Preferably, there are four drain holes 7, and the cross-section of each drain hole 7 is rectangular. By setting the drain hole 7, the water in the cavity at the junction of the outer drain pipe 2 and the inner drain pipe 3 can be discharged in a timely manner.

[0037] Furthermore, the outer diameter of the lower part C of the inner drain pipe 3 is less than or equal to the inner diameter of the supporting boss 4 of the outer drain pipe 2.

[0038] In this embodiment, both the outer drain pipe 2 and the inner drain pipe 3 are made of weather-resistant plastic materials such as PE or PP-R and manufactured in one piece using a specific mold. PE or PP-R plastics have better weather resistance and are less prone to aging and becoming brittle, which could lead to drain pipe breakage.

[0039] Example 2

[0040] An installation method for a prefabricated vertical drainage pipe for highway bridges, applied to the prefabricated vertical drainage pipe structure for highway bridges described in Example 1, includes the following steps:

[0041] S1. The outer wall of the drain pipe 2 and the reinforcing protrusion 6 are pre-embedded into the beam concrete 1 during the concrete pouring process.

[0042] S2. After the concrete of beam 1 has completely hardened, the inner drainage pipe 3 is assembled from top to bottom into the pre-embedded outer drainage pipe 2, so that the protrusion 5 is supported on the supporting boss 4, and the contact surfaces of the protrusion 5 and the supporting boss 4 are bonded with sealant. The pointed end of the bottom of the inner drainage pipe 3 faces towards the root of the bridge flange plate.

[0043] The prefabricated vertical drainage pipe structure for highway bridges provided by this invention eliminates the need to disassemble the drainage hole template, thus preventing damage to the incompletely hardened concrete layer. Furthermore, the outer drainage pipe 2 is pre-embedded in the beam concrete 1. After the beam concrete 1 has fully hardened, the inner drainage pipe 3 is assembled from top to bottom into the outer drainage pipe 2. Compared to the prior art, which requires workers to go below the bridge to install the drainage pipe at the pre-reserved drainage hole from bottom to top, this method is not only time-saving and labor-saving but also safer.

[0044] Of course, the above description is not intended to limit the present invention, and the present invention 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 invention should also fall within the protection scope of the present invention.

Claims

1. A method for installing a modular vertical drainage pipe for highway bridges, characterized in that, This invention relates to a prefabricated vertical drainage pipe structure for highway bridges. The prefabricated vertical drainage pipe structure for highway bridges includes an outer drainage pipe pre-embedded in the concrete beam and an inner drainage pipe installed in the outer drainage pipe. The lower end of the outer drainage pipe extends from the bottom of the concrete beam, and the lower end of the inner drainage pipe extends from the lower end of the outer drainage pipe. The inner wall of the outer drain pipe has a supporting boss, and the outer wall of the inner drain pipe has a protrusion that connects with the supporting boss. Multiple reinforcing bosses are arranged around the outer wall of the outer drain pipe, and the outer wall and reinforcing bosses are embedded and fixed in the beam concrete. Multiple downward-sloping drainage holes are evenly arranged around the inner drain pipe, located in the cavity below the connection point between the protrusion and the supporting boss. The interior of the inner drain pipe is approximately funnel-shaped, divided into an upper, middle, and lower section from top to bottom. The middle section is an inverted frustum structure, while the upper and lower sections are cylindrical structures with the inner diameter of the upper section larger than that of the lower section. The bottom of the lower section is obliquely pointed. The outer diameter of the lower section is not greater than the inner diameter of the supporting boss of the outer drain pipe. The process includes the following steps: S1, embedding the outer drain pipe into the beam concrete during concrete pouring; S2, after the beam concrete has fully hardened, assembling the inner drain pipe from top to bottom inside the previously embedded outer drain pipe, so that the protrusion is supported on the supporting platform, and bonding the contact surfaces of the protrusion and the supporting platform with sealant.

2. The installation method of the assembled vertical drainage pipe for highway bridges according to claim 1, characterized in that, The longitudinal section of the supporting boss is trapezoidal.

3. The installation method of the assembled vertical drainage pipe for highway bridges according to claim 2, characterized in that, Both the outer and inner drain pipes are made of PE or PP-R plastic and manufactured in one piece using a mold.

4. The installation method of the assembled vertical drainage pipe for highway bridges according to claim 1, characterized in that, The protrusion is located around the center.

5. The installation method of the assembled vertical drainage pipe for highway bridges according to claim 1, characterized in that, The protrusion is glued to the contact surface of the supporting boss.

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