Construction method of monitoring facility for leakage behind dam in severe cold area

Abstract

The invention relates to a construction method of a monitoring facility for leakage behind a dam in a severe cold area, and the construction method is used for construction of the monitoring facility for leakage behind the dam and comprises the following steps that foundation excavation of a retaining wall and a water collecting tank culvert is conducted, and the lowest burial depth of the foundation is not lower than the depth of a local frozen soil layer; building a retaining wall, reserving a gallery and a drainage ditch in the retaining wall, and building a water collecting tank culvert on the upstream side of the retaining wall; a profile steel grating is mounted on the upstream side of the water collection tank culvert; filling a boulder permeable body between the water collection tank culvert and the dam body, and then filling a broken stone hardcore and a heat preservation overburden layer; mounting a measuring weir and a sealing door, and brushing hydrophobic waterproof paint on the wall surface of the ditch body of the drainage ditch. The dam back leakage monitoring facility constructed through the construction method can effectively prevent water from being frozen, and the reliability of measurement weir observation results is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of earth-rock dam leakage monitoring, and in particular to a construction method of a leakage monitoring facility behind a dam in a severely cold region. Background Art

[0002] Constructing a weir behind an earth-rockfill dam for leakage monitoring is a crucial step in ensuring its safe operation. This involves building a low retaining wall behind the dam to create a sump. A weir is then installed within the retaining wall to monitor flow rate, creating a gap for flow. In cold winters in severely cold regions, ice accumulation can distort monitoring data from the weir. This is particularly true for gully-mouth dams, where there's insufficient water in the downstream ditch and the sump upstream of the retaining wall is small due to terrain. This can lead to thick ice formations, potentially compromising the stability of the retaining wall. Summary of the Invention

[0003] The present application provides a construction method for a dam leakage monitoring facility in severely cold regions, which is used for the construction of a dam leakage monitoring facility. The dam leakage monitoring facility constructed by this construction method can effectively prevent water from freezing and ensure the reliability of the water measuring weir observation results.

[0004] The construction method of the dam leakage monitoring facility in severe cold regions provided in this application includes the following steps:

[0005] 1) Excavate the foundation of retaining wall and water collection box culvert, and the minimum burial depth of the foundation shall not be lower than the depth of the local frozen soil layer;

[0006] 2) constructing the retaining wall, reserving a corridor and a drainage ditch in the retaining wall, and constructing the water collection box culvert on the upstream side of the retaining wall;

[0007] 3) Installing a steel grille on the upstream side of the water collection box culvert;

[0008] 4) Filling the space between the water collection box culvert and the dam body with a large stone permeable body, and then filling with a crushed stone cushion layer and a thermal insulation cover soil layer;

[0009] 5) Install a water measuring weir and a closed door, and apply a hydrophobic waterproof coating on the wall of the drainage ditch.

[0010] In addition, the construction method of the dam leakage monitoring facility in severe cold regions provided by this application may also have the following additional technical features:

[0011] In an optional solution, in the post-construction leakage monitoring facility, the retaining wall and the water collection box culvert meet the following requirements: the retaining wall is located on the downstream side of the dam body, a corridor and a water measuring weir are provided in the retaining wall, the corridor extends in the upstream and downstream directions and passes through the retaining wall, the water measuring weir is provided in the corridor, and a closed door capable of opening and closing the corridor is provided on the downstream side of the water measuring weir;

[0012] The water collection box culvert is located between the dam body and the retaining wall. A large stone permeable body is provided between the water collection box culvert and the dam body. The water collection box culvert has a water collection cavity, which is communicated with the corridor.

[0013] In an optional solution, in the post-dam leakage monitoring facility after construction, the measuring weir is located on the side of the corridor close to the water collection culvert, and a drainage ditch is provided in the corridor on the downstream side of the measuring weir. The drainage ditch extends to the downstream side of the corridor, the slope of the drainage ditch is not less than 5%, and at least part of the wall surface of the drainage ditch is coated with a hydrophobic waterproof coating.

[0014] In an optional scheme, in the post-dam leakage monitoring facility after construction, the foundation of the retaining wall extends in the vertical direction and is at least partially buried below the permafrost layer, and the foundation is grouted, and foundation pit backfill concrete is provided on the downstream side of the retaining wall; the bottom of the corridor extends in the direction of the horizontal plane, and the drainage width of the drainage ditch is not less than the drainage width of the measuring weir at the maximum flow rate.

[0015] In an optional solution, in the post-dam leakage monitoring facility after construction, the water collection culvert is provided with a steel grille on the side facing the large stone permeable body, and the side wall of the water collection culvert is provided with multiple drainage holes. The bottom elevation of the water collection culvert is lower than the bottom elevation of the corridor and forms a water collection pit, and the height of the water collection pit is not less than 1m.

[0016] In an optional solution, in the post-dam leakage monitoring facility after construction, a plurality of support columns are provided in the water collection culvert, and the support columns are configured to support the water collection culvert and enable seepage water to enter the water collection cavity.

[0017] In an optional solution, in the post-dam leakage monitoring facility after construction, the large stone permeable body can cover both sides and the top of the water collection culvert, and an insulation layer is laid on the top of the large stone permeable body. The insulation layer includes a crushed stone cushion layer and an insulation covering soil layer laid in sequence, and the insulation covering soil layer is filled sand and / or planting soil.

[0018] The beneficial effects of this application are:

[0019] The construction method of the dam leakage monitoring facility in the severely cold region in this application sets the water measuring weir inside the corridor of the retaining wall, and forms a relatively closed space through a closed door that can open and close the corridor, thereby reducing the heat exchange between the internal leakage water and the outside, and having a good thermal insulation effect in winter, thereby effectively avoiding the freezing of the water body and ensuring the reliability of the observation results of the water measuring weir.

[0020] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional diagram of the dam leakage monitoring facility in a severely cold region provided for this application;

[0022] Figure 2 Schematic diagram of the plan layout of the retaining wall and water collection box culvert provided for this application;

[0023] Figure 3 A schematic cross-sectional view of the retaining wall along the axis provided in this application;

[0024] Figure 4 Schematic cross-section of the water collection culvert provided for this application.

[0025] Figure numerals: retaining wall 1, corridor 11, water measuring weir 12, closed door 13, drainage ditch 14, foundation 15, foundation pit backfill concrete 16, dam body 2, water collection box culvert 3, water collection cavity 31, steel grille 32, drainage hole 33, support column 34, large stone permeable body 4, crushed stone cushion layer 5, thermal insulation cover layer 6.

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other technical solutions obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0030] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0031] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0032] like Figure 1-4 As shown, the embodiment of the present application provides a construction method for a dam leakage monitoring facility in a severely cold region, which is used to construct the dam leakage monitoring facility. Specifically, the construction method includes the following steps:

[0033] 1) Excavate the foundation 15 of the retaining wall 1 and the water collection box culvert 3, with the minimum burial depth of the foundation 15 not less than the depth of the local frozen soil layer;

[0034] 2) Construct the retaining wall 1, reserve a corridor 11 and a drainage ditch 14 inside the retaining wall 1, and construct a water collection box culvert 3 on the upstream side of the retaining wall 1;

[0035] 3) Install the steel grille 32 on the upstream side of the water collection box culvert 3;

[0036] 4) Fill the space between the water collection box culvert 3 and the dam body 2 with a large stone permeable body 4, followed by a crushed stone cushion layer 5 and an insulating cover soil layer 6;

[0037] 5) Install the water measuring weir 12 and the closing door 13, and apply a hydrophobic waterproof coating on the wall surface of the drainage ditch 14.

[0038] After the construction is completed, the leakage monitoring facilities behind the dam can reduce the heat loss of the leaking water body, ensure that the water body in front of and passing through the measuring weir 12 does not freeze, and the water flowing out of the downstream will not affect the free outflow state of the measuring weir 12 after the ice accumulates, thereby ensuring the normal operation of the measuring weir 12 in winter and the safety and stability of the retaining wall 1.

[0039] Specifically, in the post-dam leakage monitoring facilities after construction, the retaining wall 1 is located on the downstream side of the dam body 2, and a corridor 11 and a water measuring weir 12 are provided in the retaining wall 1. The corridor 11 extends in the upstream and downstream directions and passes through the retaining wall 1. The water measuring weir 12 is provided in the corridor 11. The thermal insulation effect of the corridor 11 is utilized to effectively avoid the freezing of water. A closed door 13 capable of opening and closing the corridor 11 is provided on the downstream side of the water measuring weir 12; the water collecting culvert 3 is located between the dam body 2 and the retaining wall 1, and a large stone permeable body 4 is provided between the water collecting culvert 3 and the dam body 2. The water collecting culvert 3 has a water collecting cavity 31, which is connected to the corridor 11.

[0040] After the construction is completed by this construction method, the post-dam leakage monitoring facility sets the water measuring weir 12 inside the corridor 11 of the retaining wall 1, and forms a relatively closed space through a closed door 13 that can open and close the corridor 11, reducing the heat exchange between the internal leakage water and the outside, and can play a good insulation effect in winter, thereby effectively avoiding the freezing of the water body and ensuring the reliability of the observation results of the water measuring weir 12.

[0041] like Figure 1-2 As shown, in a specific embodiment, in the post-dam leakage monitoring facility after construction, the water measuring weir 12 is located on the side of the corridor 11 close to the water collecting culvert 3, and a drainage ditch 14 is provided in the corridor 11 on the downstream side of the water measuring weir 12. The drainage ditch 14 extends to the downstream side of the corridor 11. The slope of the drainage ditch 14 is not less than 5%, so that the water flow is in a rapid state, and at least part of the wall surface of the drainage ditch 14 is coated with a hydrophobic waterproof coating.

[0042] In this embodiment, the steep slope of the drainage ditch 14 is set to accelerate the water flow speed in the drainage ditch 14 and slow down the speed of ice accumulation in the drainage ditch 14. A certain slope can gradually increase the height of the drainage ditch 14, so that the drainage of the drainage ditch 14 can still be maintained under severe cold conditions such as ice formation and accumulation at the outlet; in addition, the hydrophobic waterproof coating can reduce the adhesion of ice cubes to the structure, ensuring smooth drainage in the drainage ditch 14.

[0043] like Figure 1-2 As shown, in a specific embodiment, in the post-dam leakage monitoring facility after construction, the foundation 15 of the retaining wall 1 extends in the vertical direction and is at least partially buried below the permafrost layer, and the foundation 15 is grouted, and a foundation pit backfill concrete 16 is provided on the downstream side of the retaining wall 1; the bottom of the corridor 11 extends in the direction of the horizontal plane, so that the height of the drainage ditch 14 gradually increases from the beginning to the end of the outlet, thereby ensuring the drainage effect, and the drainage width of the drainage ditch 14 is not less than the drainage width of the measuring weir 12 at the maximum flow rate.

[0044] like Figure 1-2As shown, in a specific embodiment, in the post-dam leakage monitoring facility after construction, the water collection culvert 3 is provided with a steel grille 32 on the side facing the large stone permeable body 4, and the side wall of the water collection culvert 3 is provided with multiple drainage holes 33. The bottom elevation of the water collection culvert 3 is lower than the bottom elevation of the corridor 11 and forms a water collection pit, and the height of the water collection pit is not less than 1m.

[0045] In addition, the water collection chamber 31 of the water collection culvert 3 needs to cover the entire bottom of the retaining wall 1 as much as possible. When the span is large, a support column 34 can be set in the middle of the water collection culvert 3 for support, that is, the support column 34 is configured to support the water collection culvert 3, and the support column 34 is close to the inner wall of the water collection culvert 3. Multiple support columns 34 are arranged at intervals along the inner wall of the water collection culvert 3, but it must be ensured that the seepage water from the upstream dam body 2 can freely enter the culvert and enter the corridor 11 of the retaining wall 1 through the culvert.

[0046] like Figure 1 and Figure 4 As shown, in a specific embodiment, in the post-dam leakage monitoring facility after construction, the large stone permeable body 4 can cover both sides and the top of the water collection box culvert 3, and the top of the large stone permeable body 4 is paved with an insulation layer, which includes a crushed stone cushion layer 5 and an insulation covering soil layer 6 laid in sequence, and the insulation covering soil layer 6 is filled with sand and / or planting soil.

[0047] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A construction method for a dam leakage monitoring facility in a severely cold region, which is used for the construction of a dam leakage monitoring facility, and is characterized in that: The construction method comprises the following steps: 1) Excavate the foundation of retaining wall and water collection box culvert, and the minimum burial depth of the foundation shall not be lower than the depth of the local frozen soil layer; 2) constructing the retaining wall, reserving a corridor and a drainage ditch in the retaining wall, and constructing the water collection box culvert on the upstream side of the retaining wall; 3) Installing a steel grille on the upstream side of the water collection box culvert; 4) Filling the space between the water collection box culvert and the dam body with a large stone permeable body, and then filling with a crushed stone cushion layer and a thermal insulation cover soil layer; 5) Install a water measuring weir and a closed door, and apply a hydrophobic waterproof coating on the wall of the drainage ditch.

2. The construction method of the dam leakage monitoring facility in severe cold regions according to claim 1 is characterized in that: In the post-dam leakage monitoring facilities after construction, the retaining wall and the water collection box culvert meet the following requirements: The retaining wall is located on the downstream side of the dam body, and a corridor and a water measuring weir are provided in the retaining wall. The corridor extends in the upstream and downstream directions and passes through the retaining wall. The water measuring weir is provided in the corridor, and a closing door capable of opening and closing the corridor is provided on the downstream side of the water measuring weir. The water collection box culvert is located between the dam body and the retaining wall. A large stone permeable body is provided between the water collection box culvert and the dam body. The water collection box culvert has a water collection cavity, which is communicated with the corridor.

3. The construction method of the dam leakage monitoring facility in severe cold regions according to claim 2 is characterized in that: In the post-dam leakage monitoring facility after construction, the measuring weir is located on the side of the corridor close to the water collection culvert, and a drainage ditch is provided in the corridor on the downstream side of the measuring weir. The drainage ditch extends to the downstream side of the corridor, the slope of the drainage ditch is not less than 5%, and at least part of the wall surface of the drainage ditch is coated with a hydrophobic waterproof coating.

4. The construction method of the dam leakage monitoring facility in severe cold regions according to claim 3 is characterized in that: In the post-dam leakage monitoring facility after construction, the foundation of the retaining wall extends in the vertical direction and is at least partially buried below the permafrost layer, and the foundation is grouted, and foundation pit backfill concrete is provided on the downstream side of the retaining wall; the bottom of the corridor extends in the direction of the horizontal plane, and the drainage width of the drainage ditch is not less than the drainage width of the measuring weir at the maximum flow rate.

5. The construction method of the dam leakage monitoring facility in severe cold regions according to any one of claims 2 to 4, characterized in that: In the post-dam leakage monitoring facilities after construction, the water collection culvert is provided with a steel grille on the side facing the large stone permeable body, and the side wall of the water collection culvert is provided with multiple drainage holes. The bottom elevation of the water collection culvert is lower than the bottom elevation of the corridor and forms a water collection pit, and the height of the water collection pit is not less than 1m.

6. The construction method of the dam leakage monitoring facility in severe cold regions according to claim 5 is characterized in that: In the post-dam leakage monitoring facility after construction, a plurality of support columns are provided in the water collection box culvert, and the support columns are configured to support the water collection box culvert and enable seepage water to enter the water collection cavity.

7. The construction method of the dam leakage monitoring facility in severe cold regions according to any one of claims 2 to 4 or 6, characterized in that: In the post-dam leakage monitoring facility after construction, the large stone permeable body can cover both sides and the top of the water collection culvert, and the top of the large stone permeable body is paved with an insulation layer, which includes a crushed stone cushion layer and an insulation covering soil layer laid in sequence, and the insulation covering soil layer is filled sand and / or planting soil.

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