A new high-speed rail box girder drain pipe drip groove reservation device

Abstract

The utility model discloses a novel high -speed railway box girder drain pipe drip groove reservation device belongs to urban rail transit construction equipment technical field, reservation device is annular closed structure, including bottom surface, inboard and outboard, bottom surface is the annular plane of contact with the beam body bottom mould, inboard is the cylindrical surface of sticking with drain pipe outer wall, the axis of inboard is perpendicular to the plane of bottom surface, and the outboard is the annular surface of connecting inboard top edge and bottom surface outboard edge, reservation device is set up and is distributed in the positioning recess of through -axial and the dismounting hole of bottom surface. The utility model discloses through fixed in the beam body template drain pipe position, after concrete pouring maintenance formwork, forms drip groove around drain pipe, and rainwater drops along pipe, effectively prevents rainwater and flows down along the beam body web plate and pollutes the beam body, improves the appearance quality, and simple structure, convenient operation, adopts stainless steel material, can be repeatedly used.

Description

Technical Field

[0001] This utility model relates to the field of railway box girder prefabrication construction technology, specifically to a novel high-speed railway box girder drainage pipe drip groove reserved device. Background Technology

[0002] Simply supported box girders are prefabricated components widely used in railway construction, consisting of hollow box-shaped concrete beams. Through factory prefabrication and simple support at both ends, they combine high structural efficiency with ease of construction, making them a core component of modern standardized bridge construction.

[0003] In the current construction method, rainwater seeps along the outer wall of the drainage pipe on the bridge deck, causing water seepage on the bottom surface of the beam. The seeping rainwater flows along the lower surface of the beam web and contaminates the beam, resulting in severe flow marks over time and affecting the appearance quality of the beam. Utility Model Content

[0004] The inventors conducted a full-process analysis of the existing construction methods and ultimately identified the key issue in the box girder pouring step. The current method involves directly fixing the drainage pipes to the side formwork flanges of the box girder. After the formwork is removed following the completion of the girder pouring, shrinkage during concrete curing causes gaps to form between the bridge structure and the drainage pipes, allowing rainwater on the bridge deck to seep through the outer wall of the drainage pipes.

[0005] The purpose of this utility model is to provide a new type of drip groove reservation device for drainage pipes of high-speed railway box girders, so as to solve the problems of water seepage on the outer wall of drainage pipes mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides a novel pre-installed device for drip grooves in drainage pipes of high-speed railway box girders. During box girder casting, the pre-installed device is installed around the installation holes of the pre-installed drainage pipes on the side formwork flanges of the box girder, with positioning posts fixedly installed on the side walls of the drainage pipes. The pre-installed device is a closed annular structure, comprising a bottom surface, an inner surface, and an outer surface. The bottom surface is an annular plane that contacts the bottom formwork of the girder; the inner surface is the surface that fits against the outer wall of the drainage pipe; and the outer surface is an annular surface connecting the top edge of the inner surface and the outer edge of the bottom surface. In any axial section of the pre-installed device, the outer surface and the inner surface form an angle at their top edges, thereby forming a drip groove on the demolded box girder that guides the seepage of rainwater to flow down the outer wall of the drainage pipe and drip smoothly. A positioning groove is provided on the pre-installed device, which matches the positioning post.

[0007] Furthermore, the outer surface is an annular inclined surface, so that the axial section of the reserved device is an isosceles right triangle.

[0008] Furthermore, the reserved device also includes a disassembly hole, which is provided on the bottom surface and extends along the axial direction of the reserved device. The number of disassembly holes is at least two, and adjacent disassembly holes are spaced apart, with equal intervals between them.

[0009] Furthermore, all disassembly holes are distributed on the same circumference around the central axis of the reserved device.

[0010] Furthermore, the disassembly hole is a cylindrical hole with a diameter of 8mm and a depth of 4mm, and a circumference diameter of 190mm.

[0011] Furthermore, the diameter of the inner cylindrical surface is 176mm, the inner diameter of the bottom annular plane is 176mm, and the outer diameter of the bottom annular plane is 208mm, making the length of the right-angled side of the isosceles right triangle 16mm.

[0012] Furthermore, there are four positioning grooves and four disassembly holes. The four positioning grooves and four disassembly holes are staggered and evenly arranged along the reserved device.

[0013] Furthermore, the reserved device is made of stainless steel.

[0014] This utility model has the following advantages over the prior art:

[0015] 1. This utility model adopts a method of directly fixing the formwork to the corresponding position of the drainage pipe of the box girder. After the beam is demolded and moved out of the production platform, a drip groove is formed around the drainage pipe. The drip groove can effectively cut off and guide the rainwater flowing down the outer wall of the drainage pipe to drip directly, preventing rainwater from seeping along the web, thereby improving the appearance quality of the beam and reducing the cost of cleaning and maintaining the beam due to rainwater pollution.

[0016] 2. This utility model has a simple structure and is easy to operate. It is made of stainless steel, which avoids the device from rusting due to contact with curing water during bridge maintenance. After the maintenance is completed and the utility model is removed from the beam, only the residual concrete on the surface needs to be simply polished before it can be reused.

[0017] In summary, this utility model has a simple structure, reasonable design, and strong practicality. It can effectively improve the quality, construction efficiency, and economic benefits in the pre-construction process of drainage pipes, and has broad application value in the construction of drip grooves for precast drainage holes in box girders. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a bottom view of the present invention;

[0020] Figure 3for Figure 2 AA section view;

[0021] Figure 4 for Figure 2 BB cross-sectional view;

[0022] Figure 5 This is a schematic diagram of the present invention installed around the bottom of the drain pipe;

[0023] Figure 6 A cross-sectional view of the beam and drain pipe after demolding and dismantling this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1—Bottom surface; 2—Inner surface; 3—Outer surface;

[0026] 4—Positioning groove; 5—Disassembly hole; 6—Drain pipe;

[0027] 61—Positioning post. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] like Figures 1 to 6 As shown, this utility model embodiment provides a novel pre-reserved device for a drip groove in a high-speed railway box girder drainage pipe. During the casting of the box girder, the pre-reserved device is installed around the installation hole of the pre-reserved drainage pipe 6 on the side formwork flange of the box girder. A positioning post 61 is fixedly installed on the side wall of the drainage pipe 6. The pre-reserved device is a closed annular structure, including a bottom surface 1, an inner surface 2, and an outer surface 3. The bottom surface 1 is an annular plane that contacts the bottom formwork of the beam. The inner surface 2 is a surface that fits against the outer wall of the drainage pipe 6. The outer surface 3 is an annular surface that connects the top edge of the inner surface 2 with the outer edge of the bottom surface 1. In any axial section of the pre-reserved device, the outer surface 3 and the inner surface 2 form an angle at their top edges, thereby forming a drip groove on the box girder after demolding, guiding the seepage of rainwater to flow down the outer wall of the drainage pipe 6 and drip smoothly. A positioning groove 4 is provided on the pre-reserved device, which matches the positioning post 61.

[0030] In this embodiment, as Figure 5As shown, the pre-installed device is directly fixed to the box girder formwork. After the girder is demolded and moved from the production platform, a drip groove is formed around the drainage pipe 6. This drip groove allows rainwater to drip down the outer wall of the drainage pipe, preventing rainwater from seeping along the web, thereby improving the appearance quality of the girder and reducing maintenance costs. The positioning groove 4 is used to fit the original positioning post 61 on the outer wall of the drainage pipe 6, preventing gaps that could allow concrete to enter during pouring, and also restricting the rotation between the pre-installed device and the drainage pipe 6 to prevent misalignment caused by rotation.

[0031] like Figure 1 and Figure 3 As shown, the outer surface 3 is an annular inclined surface, so that the axial section of the reserved device is an isosceles right triangle. Without the reserved device, the shrinkage of the concrete and the gap created by the drain pipe 6 are perpendicular to the bottom surface of the beam. The micropores and hydrophilic groups on the concrete surface generate strong capillary forces, forming negative pressure adsorption. Even with the surface perpendicular, the capillary force can still counteract gravity. The drain pipe 6 is usually made of plastic such as PVC, which has low surface energy, allowing water droplets to easily fall off the surface of the drain pipe 6, forming a continuous water film seepage on the bottom surface of the beam. For example... Figure 6 As shown, after the pre-installed device is placed, the demolded beam forms a drip groove around the drain pipe 6, located at the junction of the gap and the bottom surface of the beam. In this embodiment, the outer surface 3 and the inner surface 2 form a 45° angle at their top edges. This results in the axial section where the straight line of the slope formed by the drip groove intersects the straight line of the corresponding generatrix of the drain pipe 6 at a 45° angle. At this point, the component of gravity along the slope increases, exceeding the capillary adhesion threshold, causing water droplets to detach from the concrete surface and drip down the outer wall of the drain pipe 6.

[0032] In this embodiment, the pre-installed device also includes a disassembly hole 5, which is disposed on the bottom surface 1 and extends along the axial direction of the pre-installed device. There are at least two disassembly holes 5, spaced apart from adjacent holes 5 at equal intervals. All disassembly holes 5 are distributed on the same circumference around the central axis of the pre-installed device. When removing the pre-installed device from the beam formwork, tools can be inserted into the disassembly holes to rotate the pre-installed device, loosening it from the concrete surface for easy removal.

[0033] In this embodiment, the disassembly hole 5 is a cylindrical hole with a diameter of 8mm and a depth of 4mm, and a circumference diameter of 190mm. Figure 1As shown, the diameter of the inner cylindrical surface 2 is 176mm, the inner diameter of the annular plane of the bottom surface 1 is 176mm, and the outer diameter of the annular plane of the bottom surface 1 is 208mm, making the leg length of the isosceles right triangle 16mm. The dimensions of this embodiment are suitable for a drain pipe 6 with an outer diameter of 176mm, so that the inner surface 2 of the reserved device can completely fit with the outer wall of the drain pipe 6, avoiding the situation where concrete enters the inner surface 2 of the reserved device and the outer wall of the drain pipe 6 during pouring, causing difficulty in demolding.

[0034] In this embodiment, there are four positioning grooves 4 and four disassembly holes 5, which are staggered and evenly arranged along the reserved device. Both the positioning grooves 4 and the disassembly holes 5 are holes opened on this reserved device. The staggered arrangement avoids excessive concentration of hole and groove structures on the same radial cross-section, which helps maintain the overall structural strength and rigidity of the reserved device. The even arrangement helps to distribute stress evenly, reducing the risk of structural failure due to localized stress concentration and improving stability.

[0035] In this embodiment, the entire pre-installed device is made of stainless steel. Using stainless steel prevents rust and contamination of the beam from the curing water, extending the device's lifespan. Stainless steel also has low surface energy and good demolding properties, effectively reducing concrete adhesion during pouring and making it easier to remove the device from the concrete after curing, thus facilitating its reuse.

[0036] In this embodiment, the working process of the pre-installed device for the drip groove of the drainage pipe of the new high-speed railway box girder is as follows:

[0037] Step 1: Install the pre-reserved device around the pre-reserved drainage pipe 6 on the side formwork flange of the box girder, and fix it directly to the formwork.

[0038] Step 2: When the beam is poured and the formwork is removed, use auxiliary tools to rotate or pry the pre-installed device to loosen it from the surrounding concrete, and then remove it.

[0039] Step 3: Grind and remove any residual concrete from the surface of the pre-installed device to facilitate reuse.

[0040] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0041] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A novel pre-reserved device for a drainage pipe drip groove in a high-speed railway box girder, wherein during the casting of the box girder, the pre-reserved device is installed around the installation hole of the pre-reserved drainage pipe (6) on the side flange plate of the box girder, and a positioning column (61) is fixedly provided on the side wall of the drainage pipe (6), characterized in that: The reserved device is a ring-shaped closed structure. The reserved device includes a bottom surface (1), an inner surface (2) and an outer surface (3). The bottom surface (1) is a ring-shaped plane that contacts the bottom formwork of the beam. The inner surface (2) is a surface that fits against the outer wall of the drain pipe (6). The outer surface (3) is a ring-shaped surface that connects the top edge of the inner surface (2) and the outer edge of the bottom surface (1). In any axial section of the reserved device, the outer surface (3) and the inner surface (2) form an angle at the top edge, thereby forming a drip groove on the box beam after demolding to guide the seepage of rainwater to flow down the outer wall of the drain pipe (6) and drip smoothly. The reserved device is provided with a positioning groove (4), which matches the positioning post (61).

2. The novel high-speed railway box girder drainage pipe drip groove pre-reservation device according to claim 1, characterized in that: The outer surface (3) is an annular inclined surface, so that the axial section of the reserved device is an isosceles right triangle.

3. The novel high-speed railway box girder drainage pipe drip groove pre-reservation device according to claim 1, characterized in that: The reserved device also includes a disassembly hole (5), which is provided on the bottom surface (1). The disassembly hole (5) extends along the axial direction of the reserved device. The number of disassembly holes (5) is at least two, and adjacent disassembly holes (5) are spaced apart, and the distance between the spaces is equal.

4. A novel drip groove pre-installation device for drainage pipes of high-speed railway box girders according to claim 3, characterized in that: All of the aforementioned disassembly holes (5) are distributed on the same circumference around the central axis of the reserved device.

5. A novel drip groove pre-installation device for drainage pipes of high-speed railway box girders according to claim 4, characterized in that: The disassembly hole (5) is a cylindrical hole with a diameter of 8 mm and a depth of 4 mm, and the diameter of the circumference is 190 mm.

6. A novel drip groove pre-installation device for drainage pipes of high-speed railway box girders according to claim 2, characterized in that: The inner surface (2) has a cylindrical diameter of 176 mm, the bottom surface (1) has an annular plane inner diameter of 176 mm, and the bottom surface (1) has an annular plane outer diameter of 208 mm, so that the length of the right-angled side of the isosceles right triangle is 16 mm.

7. A novel drip groove pre-installation device for drainage pipes of high-speed railway box girders according to claim 3, characterized in that: The number of positioning grooves (4) is four, and the number of disassembly holes (5) is four. The four positioning grooves (4) and the four disassembly holes (5) are staggered and evenly arranged along the reserved device.

8. A novel drip groove pre-installation device for drainage pipes of high-speed railway box girders according to claim 1, characterized in that: The reserved device is made entirely of stainless steel.

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