A self-leveling slag collecting pit and construction method

Abstract

The present application provides a kind of heap slag self-leveling slag collecting pit and construction method, the pit bottom groove is equipped in the slag collecting pit, the size of the pit bottom groove is matched with the volume of the broken slag generated by the rock plug body blasting, and the opening edge of the pit bottom groove is embedded with pumping concrete pump pipe.The slag collecting pit construction method comprises the following steps: S1. making rock plug body blasting hydraulic model;S2. run the model, and get simulated slag heap after blasting;S3. according to the size parameters of the simulated slag heap, set the pit bottom groove in the slag collecting pit;S4. embed the pumping concrete pump pipe at the opening edge of the pit bottom groove;S5. the rock plug body is blasted, and the obtained slag heap is backfilled into the pit bottom groove;S6. by the embedded pumping concrete pump pipe, self-compacting concrete is poured on the surface of the slag heap, which solves the technical problem of underwater slag heap not easy to transport and clean in the prior art.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, and in particular to a self-leveling slag collection pit and its construction method. Background Technology

[0002] In the field of hydropower, for pumped storage power stations, if the inlet / outlet is located within an existing reservoir, and lowering the water level in the reservoir to meet the inlet / outlet construction requirements is difficult, using a rock plug inlet / outlet is an economical and convenient solution. The debris generated from the blasting of the rock plug at the inlet / outlet will accumulate in a slag pit under the impact of water pressure. At this time, the slag pit is filled with water, making it difficult to transport and remove the debris. This debris will adversely affect the flow pattern at the inlet / outlet and the operation of the unit. Therefore, it is essential to arrange the slag pit before the rock plug blasting to ensure that the debris can be collected and secured after the blast. Summary of the Invention

[0003] This invention provides a self-leveling slag collection pit and construction method to solve the technical problem of underwater slag piles being difficult to transport and clean in the prior art.

[0004] A self-leveling slag collection pit is provided, which is located below the rock plug body and at the end of a water pipeline. The slag collection pit has a bottom groove, the size of which matches the volume of the debris generated by the blasting of the rock plug body. A concrete pumping pipe is pre-embedded at the opening edge of the bottom groove.

[0005] A construction method for a self-leveling slag collection pit, comprising the following steps: S1. Constructing a hydraulic model of a rock plug blasting, including a simulated rock plug and a simulated slag collection pit; S2. Running the model in S1, the simulated rock plug is blasted to obtain a simulated slag pile; S3. Enlarging the simulated slag pile according to its size parameters in S2, and setting the pit bottom groove in the slag collection pit; S4. Pre-embedding the concrete pumping pipe at the opening edge of the pit bottom groove; S5. Blasting the rock plug, and backfilling the resulting slag pile into the pit bottom groove; S6. Pouring self-compacting concrete onto the surface of the slag pile through the pre-embedded concrete pumping pipe.

[0006] Furthermore, the simulated slag collection pit in S1 is designed as a plane, used to accumulate the simulated slag pile obtained after the simulated rock plug body is blasted.

[0007] Furthermore, the geometric scale of the hydraulic model for the rock plug blasting is greater than or equal to 1:20.

[0008] Furthermore, the blasting test in the hydraulic model of the rock plug blasting was simulated using explosive blasting.

[0009] Furthermore, the dimensional parameters of the pit bottom groove are determined by the slag pile parameters obtained after the rock plug blasting hydraulic model.

[0010] This invention provides a self-leveling slag collection pit and its construction method. A hydraulic model of the rock plug blasting is constructed according to the actual shape of the rock plug inlet / outlet. Based on the results of the slag accumulation from the model test, a corresponding depth of groove is excavated at the bottom of the slag collection pit. A concrete pumping pipe connected to the outside is pre-embedded in the corner of the groove. Finally, the blasting conditions, such as the reservoir water level and charge quantity, are determined, and the rock plug is blasted. Self-compacting concrete is poured onto the slag surface in the groove through the pre-embedded concrete pumping pipe, promptly collecting and fixing the slag pile. This reduces damage to the waterway and generating units caused by the slag pile, solving the technical problem of difficult underwater slag pile transportation and cleaning in existing technologies. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This embodiment provides a schematic diagram of a construction method for a self-leveling slag collection pit.

[0013] Figure 2 This is a schematic diagram of the inlet / outlet of the rock plug body before blasting in the hydraulic model of rock plug blasting provided in this embodiment;

[0014] Figure 3 This is a schematic diagram of the blasting test results of the rock plug inlet / outlet of the hydraulic model provided in this embodiment;

[0015] Figure 4 This is an overall schematic diagram of the slag self-leveling slag collection pit provided in this embodiment;

[0016] Figure 5 This is a top view of the slag self-leveling slag collection pit provided in this embodiment;

[0017] Figure 6 This is a schematic diagram of the leveling of the slag pit after the rock plug blasting provided in this embodiment.

[0018] Icons: 1-Slag collection pit; 2-Water pipeline; 3-Rock plug; 4-Pit bottom groove; 5-Concrete pump pipe. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0020] This embodiment provides a self-leveling slag collection pit, comprising a slag collection pit 1, a water conveyance pipe 2, a rock plug 3, a pit bottom groove 4, and a concrete pumping pipe 5. The slag collection pit 1 is located at the end of the water conveyance pipe 2, and the pit bottom groove 4 is located within the slag collection pit 1. The rock plug 3 is situated above the pit bottom groove 4. The rock plug 3 serves as a water-blocking structure during construction and will be blasted away before water is introduced. The debris generated during the blasting will accumulate in the pit bottom groove 4 under water pressure. The dimensional parameters of the pit bottom groove 4 are determined based on test results from a hydraulic model of the rock plug blasting. The concrete pumping pipe 5 is pre-embedded at the opening edge of the pit bottom groove 4.

[0021] The construction method for the self-leveling slag collection pit provided in this embodiment includes the following steps:

[0022] S1. Construct a hydraulic model of the rock plug blasting. Based on the actual shape and size of the inlet / outlet of rock plug 3, construct a hydraulic model of the rock plug blasting, including a simulated rock plug and a simulated slag pit. The geometric scale of the model should be no less than 1:20, and the inlet model should simulate the slope topography according to the topographic map.

[0023] S2. Model Test. A simulated rock plug blasting test was conducted according to the hydraulic engineering model test specifications. During the simulated rock plug blasting model test, the bottom of the simulated slag collection pit was initially set to horizontal, and the position and corresponding height of the debris accumulation at the bottom of the horizontal pit after the simulated rock plug blast was calculated. The blasting test used simulated explosive blasting, with the amount of simulated explosive selected using a volume scaling method. Dynamic monitoring of the rock debris movement process was performed on the rock plug 3 blasting model test, measuring the amount of slag piled up at different locations and the slag pile curve.

[0024] S3. Excavate the bottom groove 4. Based on the debris accumulation position and height obtained from the blasting model test of the rock plug 3, and after converting the scale of the model and prototype, excavate the bottom groove 4 at the corresponding position and depth at the bottom of the debris collection pit 1. The excavation can be carried out through the unfilled water supply pipe 2. The excavation range of the bottom groove 4 is 0.1-0.2m larger than the distance calculated from the test. To ensure a flat bottom for the debris collection pit 1, the depth of the bottom groove 4 can be 2-3cm deeper than the test results.

[0025] S4. Pre-embed concrete pumping pipes 5. Six concrete pumping pipes 5 are pre-embedded at the opening edge of the groove 4 at the bottom of the pit, entering the slag collection pit 1 from the upstream gate well and the unfilled water pipeline 2. The concrete pumping pipes 5 are distributed at the four corners of the groove 4 and the lowest point of the long side parallel to the water flow direction. The diameter of the concrete pumping pipes 5 is 0.2-0.3m.

[0026] S5. Detonation of Rock Plug 3. Based on the model test results, the blasting conditions, such as the reservoir water level and charge quantity, for rock plug 3 were determined, and the rock plug 3 was blasted. The scattered debris generated by the actual blasting of rock plug 3 was collected in the groove 4 at the bottom of the pit, forming a relatively flat slag collection pit 1. At this time, the slag pile was relatively loose.

[0027] S6. Pouring self-compacting concrete. Self-compacting concrete is poured onto the surface of the slag heap in the pit bottom groove 4 through the pre-embedded concrete pump pipe 5, covering and fixing the loose slag heap. The self-compacting concrete can automatically level itself without vibration.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a self-leveling slag collection pit, characterized in that, The slag collection pit (1) is located below the rock plug (3) and at the end of the water pipeline (2). The slag collection pit (1) has a bottom groove (4) inside. The size of the bottom groove (4) matches the volume of the debris generated by the blasting of the rock plug (3). A concrete pumping pipe (5) is pre-embedded at the opening edge of the bottom groove (4). The construction method includes the following steps: S1. Construct a hydraulic model of a rock plug blasting, including a simulated rock plug and a simulated slag collection pit; the simulated slag collection pit is set as a plane and is used to accumulate the simulated slag pile obtained after the simulated rock plug is blasted. S2. Run the model described in S1, and obtain a simulated slag heap after the simulated rock plug is blasted; S3. The size parameters of the simulated slag heap described in S2 are scaled up proportionally, and the pit bottom groove (4) is set in the slag collection pit (1); the size parameters of the pit bottom groove (4) are determined by the slag heap parameters obtained after the rock plug blasting hydraulic model; S4. The concrete pump pipe (5) is pre-embedded at the opening edge of the groove (4) at the bottom of the pit; S5. The rock plug (3) is blasted and the resulting slag is backfilled into the pit bottom groove (4); S6. Self-compacting concrete is poured onto the surface of the slag heap through the pre-embedded concrete pumping pipe (5).

2. The construction method according to claim 1, characterized in that, The geometric scale of the hydraulic model for the rock plug blasting is greater than or equal to 1:

20.

3. The construction method according to claim 1, characterized in that, The blasting test in the hydraulic model of the rock plug blasting was simulated using explosive blasting.

Images