A method for reinforcing a box culvert in situ using a U-shaped drainage culvert

Abstract

The present application belongs to the technical field of structure reinforcement, and discloses a method for reinforcing a current box culvert by using a U-shaped drainage culvert, which mainly uses the U-shaped drainage culvert to construct the current box culvert, and the construction process includes steps such as measurement positioning and U-shaped drainage culvert setting. Compared with the prior art, the U-shaped concrete drainage culvert is arranged in the current box culvert, the U-shaped concrete drainage culvert includes a U-shaped main structure and a post-poured sealing band, compared with the current box culvert relocation and the planned pipeline detour, the U-shaped concrete drainage culvert in the present application directly protects the current box culvert by using the combination of the U-shaped main structure and the post-poured sealing band, and can replace the bottom plate, and in the later pipeline construction, only the U-shaped concrete drainage culvert needs to be arranged in the current box culvert, and after the structure is formed, the pipeline construction can be carried out, which is simple and fast, and has lower cost and shorter construction period than other conventional methods.

Description

Technical Field

[0001] This invention belongs to the field of structural reinforcement technology, specifically relating to a method for reinforcing existing box culverts using a U-shaped drainage culvert. Background Technology

[0002] With rapid urbanization, the importance of underground drainage systems has become increasingly prominent. As a crucial component of these systems, existing box culverts directly impact the overall operational efficiency. However, due to historical conditions, geological environment, and other factors, many existing box culverts suffer from structural aging and leakage, severely affecting their drainage performance and service life. With technological advancements, societal progress, and rising living standards, people are paying increasing attention to their surrounding environment. Consequently, the volume of rainwater and sewage separation projects is growing daily. However, during construction, conflicts often arise between the elevations of proposed pipelines and existing pipelines.

[0003] In the existing technology, when the elevation of the proposed pipeline conflicts with that of the existing pipeline, the common approach is to relocate the existing pipeline or set up a junction well. However, these approaches involve complicated procedures, long construction periods, and high costs. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reinforcing existing box culverts using U-shaped drainage culverts, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for reinforcing existing box culverts using a U-shaped drainage culvert, comprising the following steps:

[0006] S1: Before construction, a support well is set up inside the existing box culvert. After the drainage, ventilation and lighting preparations are completed on site, the existing box culvert is entered to measure its dimensions. The proposed pipeline route is measured and laid out inside the box culvert to obtain the actual dimensions of the existing box culvert and the planar position of the proposed pipeline route. Then, the specifications of the U-shaped concrete drainage culvert are determined based on the actual dimensions of the existing box culvert and the intersection length between the proposed pipeline route and the existing box culvert. The U-shaped concrete drainage culvert consists of a U-shaped main structure and a post-cast sealing strip.

[0007] S2: Tie steel bars and set up formwork inside the existing box culvert to pour the U-shaped main structure, so that the U-shaped main structure is closely attached to the bottom plate and side wall of the existing box culvert.

[0008] S3: After the U-shaped main structure is poured and the concrete reaches the design strength, the post-pouring sealing strip is poured. The post-pouring sealing strip is located above the U-shaped main structure and is in close contact with the existing box culvert top slab sidewall.

[0009] S4: After the post-cast sealing strip is cast and formed into a whole with the U-shaped main structure, the existing box culvert can be protected by the U-shaped main structure and the post-cast sealing strip during the subsequent construction of the proposed pipeline. When the proposed pipeline collides with the existing box culvert, the U-shaped concrete drainage culvert is used to maintain the stability of the existing box culvert and to replace the bottom plate of the existing box culvert in the future.

[0010] Preferably, in step S1, the length of the U-shaped concrete drainage culvert is at least 3 meters longer on both sides of the intersection length between the proposed pipeline and the existing box culvert.

[0011] Preferably, in step S2, the U-shaped main structure is formed by one-time casting of self-compacting concrete.

[0012] Preferably, in step S4, the width of the post-cast sealing strip is consistent with the thickness of the side wall of the U-shaped main structure, and its height is not less than the thickness of the existing box culvert top plate.

[0013] Preferably, the thickness of the bottom plate and side of the U-shaped main structure is not less than the thickness of the existing box culvert bottom plate and side wall.

[0014] Preferably, the U-shaped main structure and the post-cast sealing strip are used to reinforce and protect the existing box culvert after molding.

[0015] Preferably, the post-cast sealing strip is formed by mortar casting.

[0016] Preferably, the post-cast sealing strip has a long, solid structure.

[0017] Preferably, the U-shaped main structure is formed by concrete casting.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention involves installing a U-shaped concrete drainage culvert inside an existing box culvert. This U-shaped concrete drainage culvert includes a U-shaped main structure and a post-cast sealing strip. Compared to relocating existing box culverts and rerouting planned pipelines, the U-shaped concrete drainage culvert in this invention directly protects the existing box culvert by combining the U-shaped main structure and the post-cast sealing strip. It can also replace the bottom slab. When constructing the planned pipeline later, only the U-shaped concrete drainage culvert needs to be installed inside the existing box culvert. After the structure is formed, the planned pipeline can be constructed. The construction is simple and quick, and the cost and construction period are lower than other conventional methods. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the U-shaped drainage culvert in this invention;

[0021] Figure 2 This is a schematic cross-sectional view of the U-shaped drainage culvert in this invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-2 As shown, the present invention provides the following technical solution:

[0024] A method for reinforcing an existing box culvert using a U-shaped drainage culvert includes the following construction steps. In this invention, an existing box culvert with dimensions BXH = 2.2m × 2m is used as an example for illustration:

[0025] S1: Before construction, support wells 6 are built on both sides of the proposed U-shaped drainage culvert to meet the conditions for personnel and materials to enter and exit the existing box culvert. After the support wells 6 are completed, the existing box culvert is entered to re-measure the dimensions of the existing box culvert, and the proposed pipeline route is measured and laid out on site inside the existing box culvert to obtain the actual dimensions of the existing box culvert 1 and the planar position of the proposed pipeline route 5. Then, the specifications of the U-shaped concrete drainage culvert are selected according to the actual dimensions of the existing box culvert and the intersection length 8 between the proposed pipeline and the existing box culvert.

[0026] S2: The U-shaped concrete drainage culvert includes a U-shaped main structure 2 and a post-cast sealing strip 3. The U-shaped main structure 2 is closely attached to the existing box culvert bottom plate and side wall and is formed by concrete casting. The post-cast sealing strip 3 is a long solid structure, formed by mortar casting, closely attached to the existing box culvert top plate and side wall, and located above the U-shaped main structure 2.

[0027] In this invention, such as Figure 1 As shown, the U-shaped main structure 2 and the post-cast sealing strip 3 are connected by mortar. Regarding the selection of the specifications for the U-shaped main structure 2 and the post-cast sealing strip 3, the length of the U-shaped main structure 2 and the post-cast sealing strip 3 is at least 3 meters longer than the intersection length 8 on both sides. The thickness of the bottom plate and sidewalls of the U-shaped main structure 2 is not less than the thickness of the existing box culvert's bottom plate and sidewalls. The height of the post-cast sealing strip 3 is not less than the thickness of the existing box culvert's top plate, and its thickness is consistent with the thickness of the U-shaped main structure 2. In this invention, the intersection length 8 between the existing box culvert and the proposed pipeline is 4 meters, and the thickness of the existing box culvert 1's bottom plate, top plate, and sidewalls is 300mm.

[0028] Therefore, in this invention, the length of the U-shaped main structure 2 and the post-cast sealing strip 3 is selected to be 10 meters, the bottom plate of the U-shaped main structure 2 has a side wall thickness of 300mm, and the height and width of the post-cast sealing strip 3 are both 300mm.

[0029] S3: Tie steel bars inside the existing box culvert, set up formwork, and complete the pouring of the U-shaped main structure 2. The thickness of the bottom plate and side wall of the U-shaped main structure 2 shall not be less than the thickness of the bottom plate and side wall of the existing box culvert, and it shall be poured in one go. After the concrete of the U-shaped main structure 2 reaches the initial setting time, use mortar to pour the post-pouring sealing strip 3, and connect it with the U-shaped main structure 2 to form an integral whole.

[0030] S4: When setting up the existing box culvert support well 6, in order to minimize the road occupation, the shape of the support well can be set to a square shape similar to the size of the existing box culvert. However, in order to ensure the stability of the existing box culvert, the inner volume of the support well needs to be slightly larger than the outer diameter of the existing box culvert so that the support well can be located outside the existing box culvert.

[0031] S5: To avoid the potential for water seepage at the connection between the existing box culvert and the U-shaped drainage culvert after the U-shaped drainage culvert is installed, a layer of waterproof mortar should be applied to both ends of the U-shaped drainage culvert before it is installed.

[0032] S6: To ensure the stability of the U-shaped drainage culvert during subsequent pipeline construction, in this invention, a haunch angle steel bar 8 is added to the inner side of the side wall of the U-shaped main structure 2, which plays a role in expanding the bearing area of ​​the drainage culvert and resisting earthquakes.

[0033] S7: In order to strictly control the pouring height of the U-shaped main structure 2, a flared opening 9 is set at the intersection of the U-shaped main structure 2 and the post-pouring sealing strip 3 to observe whether the pouring height reaches the required value.

[0034] S8: To facilitate the pouring of the U-shaped drainage culvert, both ends of the U-shaped drainage culvert need to be extended into the support well by at least 300mm, and a 10mm injection port should be reserved.

[0035] S9: To ensure the good forming quality of the U-shaped main structure 2, self-compacting concrete is poured from the two side injection ports 10, and an attached vibrator is used for vibration. The pouring height is controlled through the bell mouth 9.

[0036] S10: To ensure that the post-cast sealing strip 3 can adhere tightly to the existing box culvert top slab after molding, mortar with a strength grade greater than that of the U-shaped main structure 2 is used during casting.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for reinforcing existing box culverts using U-shaped drainage culverts, characterized in that: The steps include the following: S1: Before construction, a support well (6) is set up inside the existing box culvert. After the drainage and ventilation lighting preparations are made on site, the existing box culvert (1) is entered to measure its size. The proposed pipeline (5) path is measured and laid out inside it to obtain the actual size of the existing box culvert and the planar position of the proposed pipeline (5) path. Then, the specifications of the U-shaped concrete drainage culvert are determined according to the actual size of the existing box culvert and the intersection length (8) between the proposed pipeline (5) path and the existing box culvert. The U-shaped concrete drainage culvert consists of a U-shaped main structure (2) and a post-cast sealing strip (3). S2: Tie steel bars and set up formwork inside the existing box culvert to pour the U-shaped main structure (2), so that the U-shaped main structure (2) is closely attached to the bottom plate and side wall of the existing box culvert. S3: After the U-shaped main structure (2) is poured and the concrete reaches the design strength, the post-pouring sealing strip (3) is poured. The post-pouring sealing strip (3) must be located above the U-shaped main structure (2) and be in close contact with the existing box culvert top plate side wall. S4: After the post-cast sealing strip (3) is cast and formed into a whole with the U-shaped main structure (2), the existing box culvert (1) can be protected by the U-shaped main structure (2) and the post-cast sealing strip (3) during the subsequent construction of the proposed pipeline (5). When the proposed pipeline (5) collides with the existing box culvert (1), the U-shaped concrete drainage culvert is used to maintain the stability of the existing box culvert (1) and to replace the existing box culvert bottom plate (4) in the future.

2. The method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The length of the U-shaped concrete drainage culvert in S1 is the intersection length (8) of the proposed pipeline (5) and the existing box culvert (1) extended by at least 3 meters on both sides.

3. The method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The U-shaped main structure (2) in S2 is formed by one-time casting of self-compacting concrete.

4. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The width of the post-cast sealing strip (3) in S4 is consistent with the thickness of the side wall of the U-shaped main structure (2), and its height is not lower than the thickness of the top plate of the existing box culvert (1).

5. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The thickness of the bottom plate and side of the U-shaped main structure (2) shall not be less than the thickness of the bottom plate and side wall of the existing box culvert (1).

6. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The U-shaped main structure (2) and the post-cast sealing strip (3) are used to reinforce and protect the existing box culvert (1) after molding.

7. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The post-cast sealing strip (3) is formed by mortar casting.

8. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The post-cast sealing strip (3) has a long, solid structure.

9. A method for reinforcing existing box culverts using a U-shaped drainage culvert according to claim 1, characterized in that: The U-shaped main structure (2) is formed by concrete casting.

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