Cross leak detection pipe ditch suitable for collapsible loess area
By using casing instead of leak detection trench at the intersection of leak detection trench in trapped loess areas, deep burial and high cost problems caused by the existing design are solved, the effect of reducing construction difficulty and cost is achieved, and the construction difficulty and cost is improved. Detection efficiency.
Patent Information
- Application Number
- CN202420425097.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-03-06
AI Technical Summary
In the wet loess area, the existing leak detection trench design leads to an increase in the deep burial and excavation depth downstream of the gravity flow pipeline, which brings difficulties to construction and increases the cost. At the same time, the cross-set leak detection trench increases the construction difficulty.
Use a casing to replace the leakage detection pipe trench. The casing is equipped with gravity flow pipelines. Both ends of the casing extend into the groove walls of the leakage detection pipe trench. The inner diameter of the casing is at least two levels larger than the gravity flow pipeline, and the casing faces the The downstream section tilts downward.
The buried depth of gravity flow pipeline is reduced, the construction difficulty and cost are reduced, and the work efficiency of water supply and drainage designers is improved, and it is convenient to detect water leakage.
Smart Images
Figure CN222477538U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to municipal engineering facilities, in particular to a cross leakage detection trench suitable for collapsible loess areas. Background Art
[0002] In collapsible loess areas, due to the collapsible nature of collapsible loess, under a certain pressure, the collapsible loess will deform with large deformation and fast deformation speed after being soaked in water, which is sudden and uneven. Therefore, in order to prevent the foundation from collapsing due to leakage of pipes laid underground, leak detection trenches and leak detection wells are usually set at the inlet and outlet pipes of the building.
[0003] According to Article 5.2.4 and Article 5.5.7 of the "Building Standard for Collapsible Loess Regions" GB50025-2018, all buried pipelines at a certain protective distance from the outer wall of the building must be equipped with leak detection trenches and leak detection wells. The design of the leak detection trench is specifically based on the current national standard atlas "Leak Detection Trench for Water Supply and Drainage in Collapsible Loess Regions" (atlas number 04S531-2). According to the atlas, the minimum clear height H of the leak detection trench is 600mm, the wall thickness D is usually 200mm, the cushion layer is usually 100mm, and the foundation is usually 300mm, as follows Figure 1 In the design of outdoor water supply and drainage pipes for buildings in collapsible loess areas, it is inevitable that rainwater and sewage pipes (or other gravity flow pipes) will cross. Two leak detection trenches that are avoided in elevation are usually required at the intersection, as shown below Figure 2 As shown in the figure, due to the minimum clear height, wall thickness, cushion layer and foundation requirements of the leak detection trench, the depth of burial and excavation of the gravity flow pipeline downstream will be greatly increased, which will cause great difficulties in construction support, thereby increasing the cost of the outdoor pipe network. In addition, in the actual construction process, the two intersecting leak detection trenches increase the difficulty of construction and make it difficult to implement. Summary of the invention
[0004] The utility model aims to provide a cross leakage detection trench suitable for collapsible loess areas in view of the deficiencies of the prior art, which has a simple structure, reduces construction difficulty and reduces construction cost.
[0005] The technical solution adopted by the purpose of the utility model is:
[0006] A cross leak detection trench suitable for collapsible loess areas, comprising at least two leak detection trenches arranged crosswise up and down, wherein gravity flow pipelines are arranged in the leak detection trenches, and also comprising casings, wherein each leak detection trench is divided into an upstream section and a downstream section at the intersection, the upstream leak detection trench and the downstream leak detection trench are connected by the casings, and the gravity flow pipeline is located in the casings; the casing outer wall of the upper leak detection trench of the crosswise leak detection trenches is higher than the casing outer wall of the lower leak detection trench.
[0007] Furthermore, the inner diameter of the casing is at least two levels larger than that of the gravity flow pipe.
[0008] Furthermore, the casing has a downward slope of 0.5% to 1% toward the downstream section.
[0009] Furthermore, two ends of the sleeve extend into the walls of the upstream leak detection pipe trench and the downstream leak detection pipe trench respectively.
[0010] Furthermore, both ends of the sleeve extend into the upstream leak detection pipe trench and the downstream leak detection pipe trench respectively, exceeding the trench wall by 50 to 100 mm.
[0011] Furthermore, the sleeve is a metal sleeve or a reinforced plastic tube.
[0012] Furthermore, the gravity flow pipe is a sewage pipe or a rainwater pipe.
[0013] Furthermore, the bottom of the casing of the upper leak detection trench is higher than the top of the casing of the lower leak detection trench.
[0014] The above technical solution has the following beneficial effects:
[0015] The utility model has a simple structure. When it is inconvenient to set up a leak detection trench at the intersection of pipelines, a casing is used to replace the leak detection trench. This not only reduces the burial depth of the gravity flow pipelines set up at the intersection of outdoor drainage of buildings in collapsible loess areas, reduces the cost of outdoor pipelines, reduces the difficulty of construction, but also improves the work efficiency of water supply and drainage designers.
[0016] The downward slope of the sleeve toward the downstream section is 0.5% to 1%. This slope facilitates the smooth flow of leaking water to the leak detection trench when leakage occurs in the gravity flow pipeline.
[0017] The two ends of the casing extend to the walls of the upstream leak detection trench and the downstream leak detection trench respectively, exceeding the trench wall by 50 to 100 mm, further ensuring that when a leakage occurs in the gravity flow pipeline, the leaking water flows through the casing to the leak detection trench, allowing inspectors to observe accumulated water in the leak detection well and thus determine whether a leakage occurs.
[0018] The sleeve is a metal sleeve or a structurally reinforced plastic pipe, which enhances the compression strength of the sleeve.
[0019] The bottom of the casing of the upper leak detection trench is higher than the top of the casing of the lower leak detection trench, so that the casing of the upper leak detection trench and the casing of the lower leak detection trench can be staggered in elevation, further reducing the buried depth of the downstream section of the lower leak detection trench.
[0020] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of an existing leak detection trench;
[0022] Figure 2 Schematic diagram of the leak detection trench structure set up for the existing intersection;
[0023] Figure 3 It is a structural schematic diagram of specific embodiment 1.
[0024] In the attached drawings, 1 is a leak detection trench, 2 is a casing, and 3 is a gravity flow pipeline. DETAILED DESCRIPTION Specific embodiment 1:
[0026] See also Figure 3 As shown, a cross leak detection trench suitable for collapsible loess areas includes at least two leak detection trenches 1 and a sleeve 2 arranged crosswise up and down, wherein the sleeve 2 is a metal sleeve, which increases the hardness of the sleeve. A gravity flow pipeline is arranged in the leak detection trench 1, and the gravity flow pipeline 3 is a sewage pipe or a rainwater pipe. Each leak detection trench 1 is divided into an upstream and downstream section at the intersection. The upstream leak detection trench and the downstream leak detection trench are connected by the sleeve 2. The two ends of the sleeve 2 extend to the trench wall of the upstream leak detection trench and the downstream leak detection trench, respectively, exceeding the trench wall by 50 to 100 mm. In this specific embodiment: the two ends of the sleeve extend to 70 mm in the upstream leak detection trench and the downstream leak detection trench, respectively, to ensure that when a pipeline leaks, the leaking water flows to the leak detection trench through the sleeve, so that the inspector can observe the accumulated water in the leak detection well, thereby determining whether a leak occurs. When the casing passes through the wall of the leak detection trench, a steel waterproof casing should be installed. The gap should be built, filled and squeezed tightly with M15 waterproof cement mortar, and the existing publicly known water supply and drainage leak detection wells in collapsible loess areas should be adopted, according to the standard atlas 04S531-3 page 43.
[0027] The gravity flow pipeline is located in the casing 2; the casing outer wall of the upper leak detection trench of the upper and lower cross-set leak detection trenches is higher than the casing outer wall of the lower leak detection trench, and the casings of the upper leak detection trench and the lower leak detection trench only need to be staggered in elevation. The casing bottom of the upper leak detection trench is higher than the casing top of the lower leak detection trench. In this specific embodiment: the casing bottom of the upper leak detection trench is just located at the casing top of the lower leak detection trench, which is the best embodiment. When it is inconvenient to set up a leak detection trench at the intersection of the pipelines, the casing is partially used to replace the leak detection trench, so that the burial depth of the downstream section of the lower leak detection trench is reduced, which reduces the construction difficulty and reduces the cost.
[0028] The inner diameter of the casing 2 is at least two levels larger than that of the gravity flow pipe, ensuring that the gravity flow pipe can pass through the casing quickly and safely during construction, while ensuring that there is enough space for leaking water to pass through.
[0029] Possibly, the casing 2 is inclined downwardly toward the downstream section at a slope of 0.5% to 1%, which makes it impossible for water to collect in the casing and the gravity flow pipe. Specific embodiment 2:
[0031] The feature of this specific embodiment is that the sleeve 2 adopts a reinforced plastic pipe, or a reinforced thermoplastic plastic pipe, such as HDPE double-wall corrugated pipe, UPVC double-wall corrugated pipe and wire mesh skeleton polyethylene composite pipe, etc. The other features are the same as those of specific embodiment 1, so this specific embodiment is omitted here.
Claims
1. A cross leak detection trench suitable for collapsible loess areas, comprising at least two leak detection trenches arranged crosswise up and down, wherein a gravity flow pipeline is arranged in the leak detection trench, characterized in that: It also includes a casing, and each of the leak detection trenches is divided into an upstream section and a downstream section at the intersection. The upstream leak detection trench and the downstream leak detection trench are connected by the casing, and the gravity flow pipeline is located in the casing; the outer wall of the casing of the upper leak detection trench of the leak detection trenches arranged crosswise above and below is higher than the outer wall of the casing of the lower leak detection trench.
2. The cross leak detection trench suitable for collapsible loess areas according to claim 1 is characterized by: The inner diameter of the casing is at least two levels larger than that of the gravity flow conduit.
3. The cross leak detection trench suitable for collapsible loess areas according to claim 1 is characterized by: The casing is inclined downward toward the downstream section with a slope of 0.5% to 1%.
4. The cross leak detection trench suitable for collapsible loess areas according to claim 1 is characterized by: The two ends of the sleeve extend into the walls of the upstream leak detection pipe trench and the downstream leak detection pipe trench respectively.
5. The cross leak detection trench suitable for collapsible loess areas according to claim 1, characterized in that: The two ends of the sleeve extend into the upstream leak detection pipe trench and the downstream leak detection pipe trench respectively, and exceed the trench wall by 50 to 100 mm.
6. The cross leak detection trench suitable for collapsible loess areas according to claim 1, characterized in that: The sleeve is a metal sleeve or a reinforced plastic pipe.
7. The cross leak detection trench suitable for collapsible loess areas according to claim 1, characterized in that: The gravity flow pipe is a sewage pipe or a rainwater pipe.
8. The cross leak detection trench suitable for collapsible loess areas according to claim 1, characterized in that: The bottom of the casing of the upper leak detection pipe groove is higher than the top of the casing of the lower leak detection pipe groove.