Construction method of channel type slag field flow guide structure

Abstract

The application discloses a construction method of a channel type slag field diversion structure, relates to the field of hydraulic engineering, and particularly relates to the field of slag dam, aims to improve the stability and safety of the whole slag field, reduce the cost and improve the construction efficiency of the slag field, and adopts the technical scheme that the construction method of the channel type slag field diversion structure is used, site preparation and measurement are firstly performed, main blind ditches and branch blind ditches are then constructed, a cushion layer is constructed above the main blind ditches, double-layer formworks are erected along sections on the cushion layer, the double-layer formworks comprise inner formworks and outer formworks, slag bodies are filled on the outer side and the top of the double-layer formworks, meanwhile, drainage piles are constructed in the slag bodies, a slag body drainage network is formed, grouting is performed on the slag bodies through the inner formworks, consolidated bodies are formed on the outer side of the outer formworks, air or liquid in the inner part of the outer formworks is discharged, the inner formworks are removed from the diversion hole, and finally, a lining is constructed on the inner side of the consolidated bodies in the diversion hole. The application adopts a reverse construction consolidation method and is used for the construction of the slag field in a natural gully.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering, specifically to a diversion structure for a channel-type slag heap and a construction method for the diversion structure. Background Technology

[0002] Hydropower station construction generates a large amount of waste, making the selection of a suitable waste disposal site crucial. In high mountain and canyon areas with steep terrain, the available waste disposal sites are extremely limited, making the use of natural gullies as waste disposal sites (gully-type waste disposal sites) a common practice. Gully-type waste disposal sites typically have surface runoff, originating from both upstream water from the natural gully and surface runoff from the large slopes of the waste disposal site. If drainage measures are inadequate, water can seep into and saturate the waste, reducing its effective stress and shear strength, while increasing the downward thrust. This can easily lead to seepage deformation or even overall instability of the waste, posing a serious threat to downstream river channels and surrounding structures.

[0003] For gully-type spoil heaps, the traditional drainage design involves constructing spoil dams within the natural gullies, creating a gully-type spoil heap upstream of the spoil dams. Simultaneously, a water-retaining dam is built upstream of the spoil heap to intercept incoming water, and drainage tunnels are constructed within the mountainside on one side of the spoil heap to divert the intercepted upstream water to the downstream of the spoil dams. While this drainage method prevents upstream water from entering the spoil heap, it does not address the issue of surface runoff and has drawbacks such as high cost, slow construction, and long construction period.

[0004] To avoid constructing drainage tunnels within the mountain, the existing design involves pre-constructing drainage culverts at the bottom of the slag heap, followed by slag stacking, and finally using the drainage culverts to drain upstream water. However, this design still has drawbacks. If groundwater or rainfall occurs during construction, drainage of the foundation pit becomes difficult, severely impacting construction progress and quality. Furthermore, the drainage culverts primarily divert surface runoff from upstream natural gullies, failing to address the issue of water accumulation over the large slope of the slag heap itself. Summary of the Invention

[0005] The present invention first provides a channel-type slag yard guiding structure, the purpose of which is to ensure the long-term safety and reliability of the guiding structure itself, and to improve the stability and safety of the entire slag yard.

[0006] The technical solution adopted in this invention is: a channel-type slag yard diversion structure, in which slag is piled up within a natural gully. A main blind ditch is located at the bottom of the natural gully along its upstream and downstream directions. The downstream end of the main blind ditch is located on the downstream side of the slag yard. Branch blind ditches are located on both sides of the main blind ditch along its upstream and downstream directions. The outlet of the branch blind ditches is connected to the main blind ditch. Drainage piles are arranged vertically or diagonally at intervals within the slag yard. The lower ends of the drainage piles are connected to the main blind ditch or branch blind ditches to form a slag drainage network. Blind drains, branch blind drains, and drainage piles are all structures with permeable filler material covered with a reverse filter layer and buried in the slag body; a diversion tunnel structure is also provided in the slag body along the upstream and downstream direction of the natural gully. The diversion tunnel structure includes a cushion layer, a lining, and a consolidation body. The cushion layer is set above the main blind drain, and the lining is above the cushion layer. The inner side of the lining and the cushion layer enclose the diversion tunnel to form the diversion tunnel. The upstream end and the downstream end of the diversion tunnel are located on the upstream side and the downstream side of the slag yard, respectively. The outer side of the lining is a consolidation body formed by grouting into the slag body.

[0007] The slag drainage net is mainly used to drain seepage water from inside the slag body. To further improve the drainage effect of the slag drainage net, it also includes connecting ditches. The lower end of the drainage piles is connected to the main blind ditch, branch blind ditch, or ditch-to-ditch. The connecting ditch is a structure with permeable filler covered with a reverse filter layer and buried in the slag body. The main blind ditch, branch blind ditch, and ditch-to-ditch are all arranged downwards along the direction of water flow, and the drainage piles are arranged vertically. Each connecting ditch is connected to at least two drainage piles. The lower end of the drainage pile connected to the lower end of the ditch-to-ditch is connected to the main blind ditch or the branch blind ditch.

[0008] To prevent surface runoff from carrying sediment into the drainage piles and clogging the drainage network, the drainage piles are further sealed at the top, either by covering them with a filter layer or by installing a protective pipe, with the top of the protective pipe higher than the top surface of the slag.

[0009] To facilitate the construction of the diversion tunnel structure and optimize its stress distribution, the diversion tunnel is further designed to be arranged in a straight line, with its cross-section resembling a city gate.

[0010] To reduce the cost of the slag drainage network and facilitate construction, the specific permeable filler is graded crushed stone, or pebbles and sand, and the filter layer is non-woven geotextile.

[0011] To further improve the filtration effect of the filter layer, the filter layer is further designed with a double-layer structure consisting of an inner layer and an outer layer. The pore size of the outer layer is larger than that of the inner layer. The overlaps of the filter layers are stitched together, and the joints of the filter layers are also bonded with geotextile adhesive.

[0012] The subbase layer is used to provide stable support for the lining of the diversion tunnel and the solidified body on the outside of the lining. Specifically, the subbase layer is divided into two vertical layers: an upper concrete layer and a lower gravel layer. The gravel layer is laid on top of the main blind drain, and the width of the gravel layer is greater than the width of the main blind drain, and the gravel layer completely covers the main blind drain vertically.

[0013] During the construction period, the main blind ditch can divert surface runoff from the upstream of the slag yard to the downstream of the slag yard. In order to improve the flow capacity of the main blind ditch, at least one drainage pipe is installed inside the main blind ditch, and each drainage pipe is buried in the permeable filling material of the main blind ditch.

[0014] To ensure that the main blind drain always has the capacity to carry water, the drainage pipe is further designed as a perforated pipe.

[0015] After construction, the surface runoff upstream of the slag yard was diverted to the downstream of the slag yard via a diversion tunnel. To prevent the surface runoff upstream of the slag yard from carrying sediment into the main blind ditch and thus reducing its flow capacity, the surface runoff upstream of the slag yard was further connected to the upstream end of the diversion tunnel, while the upstream end of the main blind ditch was a blind end located within the slag yard.

[0016] To further reduce the sediment content of surface runoff entering the diversion tunnel from the upstream of the slag yard, a sedimentation tank is installed on the upstream side of the slag yard, with an overflow outlet connected to the upstream end of the diversion tunnel.

[0017] The beneficial effects of the channel-type slag yard diversion structure of this invention are as follows: water seeping into the slag body from the slopes on both sides can be discharged through the slag body drainage net; water seeping into the slag body from the slopes on both sides via surface runoff and from the top surface of the slag body can also be discharged through the slag body drainage net, ensuring that seepage water inside the slag body can be discharged in a timely and effective manner, thereby ensuring the stability of the slag body itself and contributing to the stability and safety of the slag yard. The slag body drainage net is a structure in which permeable filler is covered with a reverse filter layer and is buried in the slag body. The slag body drainage net can withstand the overlying load, and the reverse filter layer can prevent the slag body drainage net from being blocked, thus improving the durability, structural stability, and drainage efficiency of the slag body drainage net. The diversion tunnel structure is mainly supported by a solidified body formed by grouting and reinforcement of the slag body, which reduces the reinforcement of the lining. The solidified body and the lining share the load, ensuring the safety of the diversion tunnel structure and also achieving the economy of the diversion tunnel structure.

[0018] The construction period for this invention is generally during the dry season. During construction, the main blind drain diverts surface runoff from upstream of the slag yard to downstream, preventing adverse effects from upstream runoff on construction. After construction is completed, surface runoff from upstream of the slag yard is diverted to downstream via a diversion tunnel, preventing it from carrying sediment into the main blind drain and clogging it.

[0019] This invention eliminates the need for additional construction of slag retaining dams and water-retaining dams in natural gullies, as well as the need for construction of drainage tunnels inside the mountainside on one side of the slag dump. This facilitates construction, significantly reduces project costs, and shortens the construction period.

[0020] This invention also provides a construction method for a channel-type slag yard diversion structure. This method is used for the construction of the aforementioned "channel-type slag yard diversion structure." The purpose of this method is to improve the stability and safety of the slag yard, reduce project costs, and increase the construction efficiency of the slag yard. The technical solution adopted by this invention is: a construction method for a channel-type slag yard diversion structure, comprising the following steps.

[0021] S1. Site preparation and measurement: First, the natural gullies are topographically surveyed to determine the scope, axis, slope and elevation of the slag yard. Then, the natural gullies are cleared, surface debris and loose soil are removed and initially compacted. Finally, the positions of the main blind drain and branch blind drains are marked.

[0022] S2. Construction of main blind drains and branch blind drains: First, excavate trenches at the marked locations of the main blind drains and branch blind drains, and then construct the main blind drains and branch blind drains within the trenches. The main blind drain is arranged along the upstream and downstream direction of the natural gully, with its upstream and downstream ends located on the upstream and downstream sides of the slag yard, respectively. Branch blind drains are provided on both sides of the main blind drain along the upstream and downstream direction of the natural gully, and the outlet of the branch blind drains is connected to the main blind drain. Both the main blind drain and the branch blind drains are permeable fillers covered with a reverse filter layer.

[0023] This invention is generally constructed during the dry season, when surface runoff upstream of the slag yard is small or even interrupted. To facilitate the drainage of surface runoff upstream of the slag yard during construction, step S2 further involves constructing a sedimentation tank upstream of the slag yard, with the upstream end of the main blind ditch located upstream of the slag yard and connected to the overflow outlet of the sedimentation tank.

[0024] To further enhance the flow capacity of the main blind drain, especially during construction, at least one drainage pipe is installed inside the drain, with each pipe embedded within the permeable filler material. Furthermore, to ensure the main blind drain maintains its flow capacity at all times, the drainage pipes are perforated pipes.

[0025] S3. Construct a subbase layer above the main blind drain to level and compact the bottom surface of the slag dump.

[0026] The subbase is used to form a diversion tunnel during construction. To ensure the bearing capacity of the subbase, the subbase is divided into two layers vertically: an upper concrete layer and a lower sand and gravel layer. During construction, a sand and gravel layer is first laid on top of the main blind drain. The width of the sand and gravel layer is greater than the width of the main blind drain, and the sand and gravel layer completely covers the main blind drain vertically. Then, the concrete layer is constructed on top of the sand and gravel layer.

[0027] S4. Double-layer templates are erected in sections on the subgrade. Each section of double-layer templates is connected sequentially along the upstream and downstream direction of the natural gully. Each section of double-layer templates includes an inner template and an outer template. The inner template is a rigid structure. The inner side of the inner template and the subgrade form a flow guide hole. The axis of the flow guide hole is straight and inclined to the downstream direction of the natural gully. The inner template is provided with grouting holes at intervals. A grouting cylinder is fixed at the grouting hole and is located outside the inner template. An outer template is provided outside the inner template. The outer template is a bag. The bag has matching holes that correspond one-to-one with the grouting cylinders. The grouting cylinders are inserted into the matching holes and temporarily sealed. The bag is filled with gas or liquid. The thickness of the outer template is greater than the length of the part of the grouting cylinder located outside the inner template.

[0028] To facilitate a stable connection between adjacent inner molds, in step S4, flanges are provided on the inner side of the ends of the two adjacent inner mold sections, and the two flanges are connected by bolts.

[0029] To further improve the sealing effect between adjacent outer molds, in step S4, the outer side of the joint between adjacent outer molds is also sealed with a sealing strip.

[0030] To further improve the strength of the inner mold during construction, step S4 involves installing support rods inside the inner mold.

[0031] S5. Slag is piled and compacted on the outside and top of the double-layer template. At the same time, drainage piles are arranged at intervals in the slag. The lower end of the drainage piles is connected to the main blind ditch or branch blind ditch to form a slag drainage network. The drainage piles are structures with a filter layer wrapped around the permeable filler.

[0032] To further improve the drainage effect of the slag drainage network, the slag drainage network also includes connecting ditches. When filling the slag in step S5, connecting ditches are also constructed within the slag. The lower end of the drainage piles is connected to the main blind ditch, branch blind ditch, or connecting ditch. The connecting ditch is a structure with a permeable filler covered with a reverse filter layer and buried within the slag. The main blind ditch, branch blind ditch, and connecting ditch are all arranged downwards along the direction of water flow, and the drainage piles are arranged vertically. Each connecting ditch is connected to at least two drainage piles. The lower end of the drainage pile connected to the lower end of the connecting ditch is connected to the main blind ditch or the branch blind ditch.

[0033] To prevent surface runoff from carrying sediment into the drainage piles and clogging the drainage network, further step S5 involves sealing or covering the upper end of the drainage pile with a filter layer, or installing a protective pipe on the upper end of the drainage pile, with the top of the protective pipe higher than the top surface of the slag.

[0034] S6. Grout is injected into the slag body outside the outer mold through the grouting hole of the inner mold to form a continuous solidified body on the outer side of the outer mold.

[0035] S7. Expel the gas or liquid from inside the outer mold, and then move the inner mold out of the guide hole.

[0036] To facilitate the movement of the double-layer template, further: in step S4, the inner side of the inner mold is shaped like a city gate, and the bottom of the inner mold is provided with a telescopic support seat. The lower end of the telescopic support seat is equipped with rollers. When setting up the double-layer template, the telescopic support seat is controlled to have a shortening allowance. Before moving the inner mold out of the guide hole in step S7, the telescopic support seat is shortened, and then the inner mold is moved out of the guide hole by pulling the inner mold.

[0037] S8. Construct lining on the inside of the solidified body within the diversion tunnel.

[0038] Surface runoff upstream of the slag yard usually carries sediment. In order to prevent sediment from clogging the main blind ditch, the construction method of the ditch-type slag yard diversion structure further includes step S9: connecting the surface runoff upstream of the slag yard to the upstream end of the diversion tunnel and sealing the upstream end of the main blind ditch.

[0039] The beneficial effects of the construction method for the channel-type slag yard diversion structure of this invention are as follows: In addition to the aforementioned beneficial effects of the "channel-type slag yard diversion structure," this invention also has the following beneficial effects: The template forming the diversion tunnel is a double-layer template. The double-layer template can effectively bear the overlying load during construction, and it is recyclable, which helps control costs. The diversion tunnel structure adopts a reverse construction method, that is, first filling and compacting the slag body, then grouting and reinforcing the slag body to form a solidified body, and finally constructing the lining. This effectively reduces the settlement after construction and avoids the problem of uneven cracking of the rigid diversion tunnel structure due to settlement. This invention uses a combined drainage system of slag body drainage net and diversion tunnel for drainage. Whether during construction or after construction, it can effectively and timely drain seepage water in the slag body and surface runoff upstream of the slag yard, and prevent surface runoff upstream of the slag yard from seeping into the slag body, thereby ensuring the stability of the slag yard. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a typical vertical cross-section of an embodiment of the channel-type slag yard guiding structure of the present invention.

[0041] Figure 2 yes Figure 1 The illustrated embodiment is shown as a plan view along the direction of the blind drain.

[0042] Figure 3 yes Figure 1 Top view of the embodiment shown.

[0043] Figure 4 This is a schematic diagram of a typical cross-section of the inner mold in this invention.

[0044] Figure 5 This is a schematic diagram of the end structure of the inner mold in this invention.

[0045] Figure 6This is a schematic diagram of a typical cross-section of the outer mold in this invention.

[0046] Figure 7 This is a schematic diagram of the structure after the inner mold and outer mold are combined in this invention.

[0047] Figure 8 This is a schematic diagram showing the connection between two adjacent outer molds in this invention via a sealing strip.

[0048] Attached diagram labels: 1. Slag body, 2-1. Main blind ditch, 2-1-1. Drainage pipe, 2-2. Branch blind ditch, 2-3. Drainage pile, 3-1. Subbase, 3-2. Lining, 3-3. Consolidated body, 3-4. Diversion tunnel, 4. Sedimentation tank, 5-1. Inner mold, 5-1-1. Grouting cylinder, 5-1-1. Flange, 5-1-2. Support rod, 5-1-3. Telescopic support seat, 5-1-4. Roller, 5-1-5. Outer mold, 5-2-1. Matching hole, 5-2-2. Sealing strip, 5-2-2; 6. Slag yard area, 7. River channel, 8. Slope line. Detailed Implementation

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] The first subject of this invention is a channel-type spoil heap diversion structure. A natural gully has a channel 7 at its bottom, which is naturally formed. The natural gully contains a stockpile of spoil 1, and the maximum extent of the spoil stockpile 1 constitutes the spoil heap area 6. For example... Figures 1-3As shown, the channel-type spoil heap has a drainage structure. The natural gully contains spoil mass 1, which is equipped with a spoil drainage net and drainage tunnels 3-4. A main blind ditch 2-1 is located at the bottom of the natural gully, running upstream and downstream; that is, the main blind ditch 2-1 is arranged along the channel 7 of the natural gully. The cross-sectional dimensions of the main blind ditch 2-1 are designed according to the drainage capacity, typically 2.0m to 4.0m wide and 1.0m to 2.0m deep. The main blind ditch 2-1 has a slope at one end, determined by the terrain conditions, and is generally small. The main blind ditch 2-1 is generally arranged in a straight line, but can also be arranged along curves or broken lines depending on the terrain. The main blind ditch 2-1 is used to drain seepage water from inside the spoil mass 1 to the downstream side of the spoil heap; therefore, the downstream end of the main blind ditch 2-1 is located on the downstream side of the spoil heap. The main blind ditch 2-1 has branch blind ditches 2-2 on both sides along the upstream and downstream direction of the natural gully, with the branch blind ditches 2-2 on the same side arranged at intervals. For example, the branch blind ditches 2-2 are arranged at intervals of 10m to 20m. The cross-sectional dimensions of the main blind ditch 2-1 are designed according to the drainage capacity and are generally smaller than the cross-sectional dimensions of the main blind ditch 2-1. For example, the branch blind ditches 2-2 are 1.0m to 2.0m wide and 0.5m to 1.0m deep. Each branch blind ditch 2-2 is generally also arranged at an angle, and the slope of the branch blind ditches 2-2 is determined according to the terrain conditions and is generally small. The branch blind ditches 2-2 can reduce the width of the main blind ditch 2-1, saving costs. The branch blind ditches 2-2 are generally arranged in a straight line, but can also be arranged along curves or broken lines depending on the terrain conditions. The higher end of the branch blind ditch 2-2 is located at the starting slope line 8, which is the boundary where the slope of the slag body 1 increases significantly along the upstream and downstream direction of the natural gully. The lower end of the branch blind ditch 2-2 is the outlet end, which is connected to the main blind ditch 2-1. The seepage water in the branch blind ditch 2-2 can flow naturally into the main blind ditch 2-1.

[0051] Drainage piles 2-3 are arranged vertically or diagonally at intervals within the slag body 1. The lower ends of drainage piles 2-3 are connected to the main blind ditch 2-1 or the branch blind ditch 2-2 to form a slag body drainage network. The drainage piles 2-3 directly guide seepage water from the slag body 1 to the main blind ditch 2-1 or the branch blind ditch 2-2. The main blind ditch 2-1, the branch blind ditch 2-2, and the drainage piles 2-3 form a three-dimensional, grid-like slag body drainage network within the slag body 1. To ensure the drainage effect of the slag body drainage network, a connecting ditch 2-4 is also included. The lower ends of drainage piles 2-3 are connected to the main blind ditch 2-1, the branch blind ditch 2-2, or the connecting ditch 2-4. The connecting ditch 2-4 increases the density of the slag body drainage network, connecting drainage piles 2-3 to each other and achieving drainage, solving the drainage problem of drainage piles 2-3 above the diversion tunnel 3-4, as well as the drainage problem of drainage piles 2-3 near the two side slopes of the slag yard. Each connecting ditch 2-4 is connected to at least two drainage piles 2-3. Among the drainage piles 2-3 connected to the same connecting ditch 2-4, the lower end of at least one drainage pile 2-3 is connected to the main blind ditch 2-1 or to the branch blind ditch 2-2.

[0052] The slag drainage net has numerous connection points. To ensure the construction quality of these connection points, connecting pipes are installed at each point. These connecting pipes are either T-shaped tees or L-shaped elbows, equipped with permeable holes and covered with geotextile. The geotextile overlaps are reliably sewn and sealed to ensure a strong seal and form a reliable drainage channel. The interior of the connecting pipes is filled with permeable filler. Drainage piles are filled with pebbles in 2-3 layers, each layer not exceeding 30cm in thickness. Long poles are used to gently and evenly tamp the pebbles to ensure compaction and prevent voids.

[0053] The slag drainage net is mainly used to drain seepage water from inside the slag body 1. To facilitate drainage and reduce the amount of water remaining inside the slag drainage net (i.e., to reduce the amount of water that cannot be naturally drained), the main blind ditch 2-1 and the branch blind ditch 2-2 are both arranged downwards along the direction of water flow. The connecting ditch 2-4 is also preferably arranged at an angle. The lower end of the drainage pile 2-3, which is connected to the lower end of the connecting ditch 2-4, is connected to the main blind ditch 2-1 or the branch blind ditch 2-2. The drainage pile 2-3 is generally arranged vertically, but can also be arranged at an angle.

[0054] The upper end of drainage pile 2-3 is located inside slag body 1, near the top surface of the slag body. In this case, the upper end of drainage pile 2-3 is sealed, or the upper end of drainage pile 2-3 is located on the top surface of slag body 1. When the upper end of drainage pile 2-3 is located on the top surface of slag body 1, in order to prevent surface runoff from slag body 1 from carrying sediment into drainage pile 2-3 and thus clogging the slag body drainage network, the upper end of drainage pile 2-3 is sealed, that is, the upper end of drainage pile 2-3 is blocked, and surface runoff from slag body 1 cannot enter drainage pile 2-3; or, the upper end of drainage pile 2-3 is covered with a filter layer to prevent sediment from entering drainage pile 2-3; or, a protective pipe is fitted over the upper end of drainage pile 2-3, with the top of the protective pipe higher than the top surface of slag body 1, to prevent surface runoff from slag body 1 from entering drainage pile 2-3. For example, after the slag body 1 is filled to the designed height, the geotextile at the top of the drainage piles 2-3 is closed and sewn and sealed with an overlap width of not less than 50cm.

[0055] The main blind drain 2-1, branch blind drains 2-2, and drainage piles 2-3 are all structures with permeable filler material covered by a filter layer and buried within the slag body 1. The connecting ditch 2-4 is also a structure with permeable filler material covered by a filter layer and buried within the slag body 1. The permeable filler material is a water-permeable material, such as graded crushed stone, or pebbles and gravel. The filter layer serves a filtering function and is generally made of non-woven geotextile. To facilitate the construction of the slag body drainage net, the slag body drainage net can also be a structure with permeable filler material covered by a filter layer, and a wire mesh or iron wire mesh is installed between the permeable filler material and the filter layer. The iron wire mesh is preferably rust-proofed, such as galvanized iron wire mesh.

[0056] To improve the filtration effect of the filter layer, it has a double-layer structure consisting of an inner and an outer layer, with the outer layer having a larger pore size than the inner layer. The filter layer is made of flexible material, typically in roll form, and the overlaps are sewn together with an overlap width of at least 30cm. To ensure the strength of the joints, the joints are also bonded with geotextile adhesive.

[0057] A diversion tunnel structure is also provided within the slag body 1 along the upstream and downstream direction of the natural gully, located above the main blind ditch 2-1. The diversion tunnel structure forms a diversion tunnel 3-4, which is used to divert surface runoff from the upstream of the slag yard to the downstream. The diversion tunnel structure includes a cushion layer 3-1, a lining 3-2, and a solidified body 3-3. The cushion layer 3-1 is located above the main blind ditch 2-1, and the lining 3-2 is located above the cushion layer 3-1. The inner side of the lining 3-2 and the cushion layer 3-1 enclose the diversion tunnel 3-4. The upstream and downstream ends of the diversion tunnel 3-4 are located on the upstream and downstream sides of the slag yard, respectively. The outer side of the lining 3-2 is the solidified body 3-3, which is formed by grouting reinforcement into the slag body 1.

[0058] The subbase 3-1 serves a leveling function and provides stable support for the lining 3-2 and the solidified body 3-3 outside the lining 3-2. A specific structure of the subbase 3-1 is described below. The subbase 3-1 is vertically divided into two layers: an upper concrete layer and a lower gravel layer. The gravel layer is laid above the main blind drain 2-1, with a width greater than the width of the main blind drain 2-1, and completely covering the main blind drain 2-1 vertically. For example, the width of the gravel layer exceeds the width of the diversion tunnel by 3m to 4m. The gravel layer acts as a filter and coordinates deformation. The gravel layer is generally made of medium-coarse sand, for example, with a thickness of 20cm to 30cm, and is compacted in layers, each 10cm to 15cm thick, with a compaction degree of over 90%. The gravel layer has the ability to filter and coordinate deformation, which can evenly transfer the load from the upper layer to the lower foundation. The upper layer is a concrete layer poured with crushed stone, which serves to level the surface and provide a solid foundation for the lining 3-2 and the solidified body 3-3 of the diversion tunnel structure, preventing deformation of the double-layer formwork and cracking of the lining 3-2 due to uneven settlement. The width of the upper layer is equal to the width of the lower layer. The lining 3-2 is generally a reinforced concrete structure. The solidified body 3-3 is formed by grouting the slag body 1. To facilitate the construction of the diversion tunnel structure and optimize its stress distribution, the cross-section of the diversion tunnel 3-4 is shaped like a city gate.

[0059] During the construction period, the main blind drain 2-1 is used to divert surface runoff from the upstream of the slag yard to the downstream, and also to drain seepage water from inside the slag body 1 to the downstream. To improve the flow capacity of the main blind drain 2-1, especially the flow capacity for surface runoff from the upstream of the slag yard, at least one drainage pipe 2-1-1 is installed inside the main blind drain 2-1, and each drainage pipe 2-1-1 is buried in the permeable filler of the main blind drain 2-1. The construction period is the dry season, and the surface runoff from the upstream of the slag yard is small. The surface runoff from the upstream of the slag yard is mainly diverted to the downstream of the slag yard through the drainage pipes 2-1-1. For example, a 400mm to 800mm diameter HDPE pipe is buried in the middle of the main blind drain 2-1 as the drainage pipe 2-1-1. The drainage pipe 2-1-1 can be a pipe with no holes in the pipe wall, or it can be a perforated pipe with through holes in the pipe wall. The main blind drain 2-1 is at risk of blockage, especially during construction. Surface runoff from upstream of the slag heap carries sediment into the main blind drain 2-1, which can easily reduce its flow capacity. To ensure the main blind drain 2-1 always has sufficient flow capacity, the drainage pipe 2-1-1 is preferably a perforated pipe. To improve the flow capacity of the branch blind drain 2-2, drainage pipes can also be installed inside the branch blind drain 2-2. These drainage pipes can be one or more, for example, with a diameter of 100mm to 200mm.

[0060] After construction, the surface runoff upstream of the slag yard will be diverted to the downstream area via diversion tunnel 3-4. Therefore, the surface runoff upstream of the slag yard is connected to the upstream end of diversion tunnel 3-4. To prevent the surface runoff upstream of the slag yard from carrying sediment into the main blind ditch 2-1, thereby reducing its flow capacity, the upstream end of the main blind ditch 2-1 is a blind end located within the slag body 1. In other words, the upstream end of the main blind ditch 2-1 is a sealed end, preventing surface runoff upstream of the slag yard from entering the main blind ditch 2-1. Both during and after construction, to reduce the sediment content of the surface runoff entering the slag yard, a sedimentation tank 4 is installed on the upstream side of the slag yard. The sedimentation tank 4 has an overflow outlet. During construction, the overflow outlet is connected to the upstream end of the main blind ditch 2-1; after construction, the overflow outlet is connected to the upstream end of diversion tunnel 3-4. The volume of sedimentation tank 4 is determined based on the surface runoff upstream of the slag dump. For example, sedimentation tank 4 is 1m to 2m deep, 5m long, and 3m to 4m wide. The tank walls and bottom are constructed of masonry or concrete, and the tank is cleaned regularly with an excavator.

[0061] The second aspect of this invention is a construction method for a channel-type slag yard diversion structure, which is also the construction method for the first aspect mentioned above. This construction method employs a reverse construction consolidation approach, solving the problem of easy damage to traditional slag yard diversion structures. The construction method for the channel-type slag yard diversion structure includes the following steps.

[0062] S1. Site preparation and measurement. First, the natural gully is topographically surveyed to determine the extent, axis, slope and elevation of the spoil heap. Then, the natural gully is cleared, surface debris and loose soil are removed and initially compacted. Finally, the positions of the main blind ditch 2-1 and the branch blind ditch 2-2 are marked.

[0063] S2, construct the main blind drain 2-1 and the branch blind drain 2-2.

[0064] First, a trench is excavated at the bottom of the natural gully. Then, the main blind ditch 2-1 and the branch blind ditch 2-2 are constructed within the trench. The main blind ditch 2-1 is arranged along the upstream and downstream direction of the natural gully. The upstream and downstream ends of the main blind ditch 2-1 are located on the upstream and downstream sides of the slag yard, respectively. Branch blind ditches 2-2 are set on both sides of the main blind ditch 2-1 along the upstream and downstream direction of the natural gully. The outlet end of the branch blind ditch 2-2 is connected to the main blind ditch 2-1. Both the main blind ditch 2-1 and the branch blind ditch 2-2 are permeable fillers covered with a reverse filter layer.

[0065] Construction typically takes place during the dry season when surface runoff upstream of the slag heap is minimal or even ceases. To facilitate the diversion and drainage of surface runoff upstream of the slag heap during construction, step S2 involves constructing a sedimentation tank 4 upstream of the slag heap. Sedimentation tank 4 can intercept surface runoff upstream of the slag heap by connecting the main blind ditch 2-1 and branch blind ditches 2-2. After the main blind ditch 2-1 is completed, its upstream end is located upstream of the slag heap and connected to the overflow outlet of sedimentation tank 4. The main blind ditch 2-1 is then used to divert surface runoff upstream of the slag heap downstream. Regular cleaning of sedimentation tank 4 ensures that the runoff flowing through the slag heap is clear water.

[0066] To improve the flow capacity of the main blind drain 2-1, especially during construction, at least one drainage pipe 2-1-1 is installed inside the main blind drain 2-1. Each drainage pipe 2-1-1 is buried within the permeable filler of the main blind drain 2-1. To ensure that the main blind drain 2-1 always has flow capacity, the drainage pipe 2-1-1 is preferably a perforated pipe, that is, the pipe wall of the drainage pipe 2-1-1 has permeable holes.

[0067] S3. Construct a subbase 3-1 above the main blind drain 2-1 to level and compact the bottom surface of the slag yard.

[0068] The foundation layer 3-1 is used to construct the diversion tunnel structure, which forms the diversion tunnel. The foundation layer 3-1 is divided into two vertical layers: an upper concrete layer and a lower sand and gravel layer. First, the sand and gravel layer is laid on top of the main blind ditch 2-1. The width of the sand and gravel layer is greater than the width of the main blind ditch 2-1, and the sand and gravel layer completely covers the main blind ditch 2-1 vertically. Then, the concrete layer is constructed on top of the sand and gravel layer.

[0069] S4. Erect double-layer formwork in sections on the subbase 3-1.

[0070] The double-layer formwork sections are connected sequentially along the upstream and downstream direction of the natural gully, that is, the double-layer formwork sections are connected in series, extending from the upstream side of the spoil heap to the downstream side. See also Figures 4-8 Each double-layer formwork section includes an inner formwork 5-1 and an outer formwork 5-2. The inner formwork 5-1 is a rigid structure, generally made of steel plate. The inner side of the inner formwork 5-1 and the bedding layer 3-1 form a diversion tunnel 3-4. The axis of the diversion tunnel 3-4 is straight, meaning the double-layer formwork is arranged along a straight line. The axis of the diversion tunnel 3-4 slopes downstream of the natural gully to reduce water accumulation and sediment deposition. For example, the slope of the axis of the diversion tunnel 3-4 is 1% to 2%. The shape of the inner side of the inner formwork 5-1 is consistent with the shape of the diversion tunnel 3-4. For example, in any cross-section of the inner formwork 5-1, the inner side of the inner formwork 5-1 has the shape of a city gate. The inner formwork 5-1 is provided with grouting holes at intervals, and grouting cylinders 5-1-1 are fixed at the grouting holes, located on the outer side of the inner formwork 5-1. The grouting cylinder 5-1-1 is generally a steel cylinder and is fixed to the grouting hole on the outside of the inner mold 5-1. For example, the grouting cylinder 5-1-1 is welded and fixed to the grouting hole on the outside of the inner mold 5-1, and the weld is sealed. The grouting cylinder 5-1-1 and the grouting hole are used for subsequent grouting of the slag outside the double-layer template.

[0071] An outer mold 5-2 is provided on the outside of the inner mold 5-1. The outer mold 5-2 is a bladder that can be filled with water or air. The bladder has matching holes 5-2-1 corresponding to the grouting cylinders 5-1-1. The grouting cylinders 5-1-1 are inserted into the matching holes 5-2-1 and temporarily sealed. Gas or liquid is filled into the bladder, allowing the grouting cylinders 5-1-1 to be inserted into the matching holes 5-2-1, and the bladder is then fixed to the inner mold 5-1. For example, air is filled into the bladder, with the air pressure controlled at 0.2 MPa. To improve the stability of the outer mold 5-2 on the outside of the inner mold 5-1, it can also be secured to the inner mold 5-1 using straps. For example, nylon straps are used to wrap around the double-layer template structure, and then the nylon straps are tightened to make the outer mold 5-2 fit tightly against the inner mold 5-1. Water or air is then injected into the inner mold 5-1 to the design pressure. This step also involves temporarily sealing the matching hole 5-2-1 to prevent a large amount of grout from seeping between the outer mold 5-2 and the inner mold 5-1 during subsequent grouting. To facilitate water or air injection into the bladder, the bladder is equipped with an injection / discharge port, preferably located inside the inner mold 5-1. After air or water is injected into the outer mold 5-2, the thickness of the outer mold 5-2 is greater than the length of the portion of the grouting cylinder 5-1-1 located outside the inner mold 5-1. This allows the outer mold 5-2 to release its internal gas or water, facilitating the removal of the inner mold 5-1.

[0072] To facilitate a secure connection between the inner molds 5-1, flanges 5-1-2 are installed on the inner sides of two adjacent sections of the inner mold 5-1, and the two flanges 5-1-2 are connected by bolts. The flanges 5-1-2 are located on the inner side of the inner mold 5-1 to facilitate the connection of bolts on the inner side of the inner mold 5-1, and to facilitate the subsequent removal of the inner mold 5-1 sections by unfastening the bolts.

[0073] There is a joint between the outer formwork 5-2 of two adjacent double-layer formwork sections. During subsequent grouting, grout can easily enter the joint, making it difficult to remove the double-layer formwork. Therefore, it is best to seal the joint between adjacent outer formwork 5-2 sections. For example, the outer side of the joint between adjacent outer formwork 5-2 sections can also be sealed with sealing tape 5-2-2. Figure 8 As shown. The sealing tape 5-2-2 is generally a waterproof tape, and the waterproof tape has sufficient width. In order to improve the strength of the joint between two adjacent outer molds 5-2, a steel strip can also be laid along the joint of the outer molds 5-2. For example, the width of the steel strip is 40cm to 50cm and the thickness is 6mm to 8mm. The steel strip and the bag are sealed with waterproof tape.

[0074] To improve the strength of the inner mold 5-1 during construction, step S4 also involves installing support rods 5-1-3 inside the inner mold 5-1. The support rods 5-1-3 include horizontal bars, diagonal bars, etc. Figure 4 and Figure 7 As shown. To facilitate demolding, a release agent can also be applied to the outside of the inner mold 5-1.

[0075] S5. Slag body 1 is piled and compacted on the outside and top of the double-layer formwork. Simultaneously, drainage piles 2-3 are installed at intervals within slag body 1. The thickness of slag body 1 directly above the double-layer formwork is generally 7m to 8m. Slag body 1 is piled and compacted in layers, each layer generally 30cm to 50cm thick, using compaction equipment to control the compaction degree to over 90%. The lower ends of drainage piles 2-3 are connected to the main blind ditch 2-1 or the branch blind ditch 2-2 to form a slag body drainage network; among them, drainage piles 2-3 are structures with a permeable fill material covered by a reverse filter layer.

[0076] Drainage piles 2-3 are generally arranged vertically, and even when drainage piles 2-3 are arranged at an angle, they are close to being vertical. To facilitate the construction of drainage piles 2-3 during the layered compaction of slag body 1, drainage piles 2-3 are constructed according to the following process: First, a skeleton is prefabricated using wire mesh. The skeleton is a hollow columnar structure, for example, galvanized wire mesh, and the cross-section of the skeleton is rectangular or circular. Second, a filter layer is wrapped around the outside of the skeleton, and then the skeleton is arranged vertically and connected and fixed to the main blind ditch 2-1, the branch blind ditch 2-2, or the connecting ditch 2-4. For example, connecting pipes are used to connect and fix the skeleton to the main blind ditch 2-1, the branch blind ditch 2-2, or the connecting ditch 2-4. The connecting pipes are T-shaped tees or L-shaped elbows. Fourth, permeable filler is filled into the skeleton, for example, pebbles are filled in layers, each layer not exceeding 30cm in thickness. Long rods are used to gently and evenly tamp the pebbles to ensure compaction and avoid voids. Fifth, the top of the skeleton is sealed, for example, the geotextile at the top of the skeleton is closed and sewn and sealed with an overlap width of not less than 50cm.

[0077] After the drainage piles 2-3 are constructed, backfilling of slag 1 in layers begins around them. During backfilling, small machinery is used to backfill a permeable material, such as gravel, within a 0.5m radius around the drainage piles 2-3, and small machinery is used to carefully compact it, avoiding direct crushing or severe impact from large machinery. The slag filling height should be at least 0.1m lower than the top of the drainage piles 2-3 at this stage. This ensures sufficient lateral restraint and fixation for subsequent construction, forming initial stability, and also facilitates connection with the connecting trench 2-4.

[0078] Drainage piles 2-3 are constructed in vertical segments, with the segment extension process being the same as described above. This includes installing the frame, wrapping the filter layer, reliably connecting it to the lower drainage piles 2-3, filling with pebbles in layers, and sealing the top of the frame. During backfilling, slag is continuously filled in layers around the newly constructed drainage piles 2-3. Similarly, protective backfilling and compaction are used around drainage piles 2-3 to protect them from sunlight, and the slag height must exceed the top of the drainage piles 2-3 constructed at this stage by at least 1.0m. Drainage piles 2-3 are constructed using a cyclical method of "constructing one section and fixing another" until the drainage piles 2-3 are extended to the final top elevation of the slag yard.

[0079] To improve the drainage effect of the slag body drainage network, the network also includes connecting ditches 2-4. During step S5, when filling slag body 1, connecting ditches 2-4 are also constructed within slag body 1. The lower ends of drainage piles 2-3 are connected to the main blind ditch 2-1, branch blind ditch 2-2, or connecting ditches 2-4. Connecting ditches 2-4 are structures with permeable filler material covered by a filter layer and are buried within slag body 1. The main blind ditch 2-1, branch blind ditch 2-2, and connecting ditches 2-4 are all arranged downwards along the water flow direction, while the drainage piles 2-3 are arranged vertically. Each connecting ditches 2-4 is connected to at least two drainage piles 2-3. Among the drainage piles 2-3 connected to the same connecting ditches 2-4, at least one drainage pile 2-3 has its lower end connected to either the main blind ditch 2-1 or the branch blind ditch 2-2.

[0080] During the filling of slag 1, care should be taken to protect the double-layer formwork and seal the gaps at the bottom of the double-layer formwork to prevent slag 1 from entering the interior of the inner mold 5-1. For example, baffles can be used to prevent slag 1 from intruding into the interior of the inner mold 5-1. To prevent surface runoff from slag 1 from carrying sediment into the drainage piles 2-3 and clogging the slag drainage network, in step S5, the upper end of the drainage piles 2-3 is sealed or covered with a filter layer, or a protective pipe is fitted over the upper end of the drainage piles 2-3, with the top of the protective pipe higher than the top surface of the slag 1. The protective pipe is generally a steel pipe, which extends 0.3m to 0.5m above the top elevation of the slag yard and is clearly marked to prevent clogging and ensure that the collected seepage water can evaporate smoothly or be discharged into the surface drainage system.

[0081] S6. Grout is injected into the slag body 1 outside the outer mold 5-2 through the grouting hole of the inner mold 5-1, forming a continuous solidified body 3-3 on the outer side of the outer mold 5-2.

[0082] During grouting, the temporary sealing material inside the grouting cylinder 5-1-1 and matching hole 5-2-1 needs to be pierced. For example, the temporary sealing material is geotextile. Grouting reinforces the slag body 1 5m to 6m behind the outer formwork 5-2, forming a shell-like solidified body 3-3. The grout is generally cement slurry or cement mortar, for example, the water-cement ratio of cement slurry and cement mortar is 0.4 to 0.6. The grouting sequence is from low to high, and the grouting pressure is gradually increased, with multiple pressurizations to avoid deformation and displacement of the double-layer formwork. The final grouting pressure is generally controlled at 0.2MPa to 0.3MPa. Grouting is stopped when the grout overflows from the vent hole, and the grouting port is sealed. After grouting, curing is generally carried out for 7 to 14 days, and the curing time is adjusted according to the ambient temperature. The next step is carried out after the grout reaches the design strength.

[0083] To improve the grouting quality, that is, to ensure the strength of the solidified body 3-3, in step S5, a grouting pipe is installed in the matching hole 5-2-1 of the double-layer template. The grouting pipe is a perforated pipe, and one end of the grouting pipe is sealed and connected to the grouting cylinder 5-1-1. The grouting pipe is embedded in the slag body 1 on the outside of the double-layer template. In step S5, grouting is performed through the grouting pipe.

[0084] S7. Discharge the gas or liquid inside the outer mold 5-2, and then move the inner mold 5-1 out of the guide hole 3-4.

[0085] After the gas or liquid inside the outer mold 5-2 is discharged, the solidified body 3-3 becomes detached from the inner mold 5-1, allowing the inner mold 5-1 to be removed from the guide hole 3-4. To prevent cracking of the solidified body 3-3, a controllable valve is used to discharge the gas or liquid from the inner mold 5-1, and the process is carried out in stages, allowing the internal pressure of the inner mold 5-1 to decrease slowly over several hours, avoiding sudden pressure changes. For example, if the outer mold 5-2 is filled with gas, the venting process lasts 2 to 4 hours, carried out in 3 to 4 stages, with each stage reducing the pressure by 25%. After the gas or liquid inside the outer mold 5-2 is completely discharged, the inner molds 5-1 are retrieved one by one, for example, by using a winch to pull them out.

[0086] To facilitate the movement of the double-layer template, in step S4, the inner side of the inner mold 5-1 is shaped like a city gate, such as... Figure 4 and Figure 7 As shown, the bottom of the inner mold 5-1 is provided with a telescopic support seat 5-1-4, and a roller 5-1-5 is installed at the lower end of the telescopic support seat 5-1-4. The support seat 5-1-4 can be extended and retracted vertically, for example, the support seat 5-1-4 is a hydraulic jack. In order to maintain balance, each section of the inner mold 5-1 is provided with at least four rollers. In order to facilitate the adjustment of the position of the inner mold 5-1, the rollers 5-1-5 are preferably swivel casters. When setting up the double-layer template, the telescopic support seat 5-1-4 is controlled to have a shortening margin. In step S7, the telescopic support seat 5-1-4 is shortened to reduce the height of the inner mold, and then the inner mold 5-1 is moved out of the guide hole 3-4 by pulling.

[0087] S8. Construct lining 3-2 inside the solidified body 3-3 inside the diversion tunnel 3-4.

[0088] Lining 3-2 is generally made of reinforced concrete. Specifically, a steel mesh is tied to the inner wall of the diversion tunnel 3-4, for example, the diameter of the steel bars is 12mm to 16mm and the spacing is 150mm to 200mm. Then, concrete is poured, for example, the concrete strength grade is C30 to C40, and the thickness of lining 3-2 is 40cm to 60cm. Pumped concrete is used, and it is poured in sections from downstream to upstream, each section being 5m to 10m long, and compacted using a vibrator. The concrete is cured for 28 days to form a permanent diversion tunnel 3-4.

[0089] The surface runoff upstream of the slag yard usually carries sediment. In order to prevent sediment from clogging the main blind ditch, the construction method of the ditch-type slag yard diversion structure also includes step S9: connecting the surface runoff upstream of the slag yard to the upstream end of the diversion tunnel 3-4, and sealing the upstream end of the main blind ditch 2-1.

Claims

1. A construction method for a channel-type slag yard diversion structure, characterized in that: Includes the following steps: S1. Site preparation and measurement: First, the topography of the natural gully is surveyed to determine the scope, axis, slope and elevation of the slag yard. Then, the natural gully is cleared, surface debris and loose soil are removed and initially compacted. Finally, the positions of the main blind ditch (2-1) and the branch blind ditch (2-2) are marked. S2. Construction of the main blind ditch (2-1) and branch blind ditches (2-2): First, excavate trenches at the marked locations of the main blind ditch and branch blind ditches, and then construct the main blind ditch (2-1) and branch blind ditches (2-2) within the trenches. The main blind ditch (2-1) is arranged along the upstream and downstream direction of the natural gully. The upstream and downstream ends of the main blind ditch (2-1) are located on the upstream and downstream sides of the slag yard, respectively. Branch blind ditches (2-2) are set on both sides of the main blind ditch (2-1) along the upstream and downstream direction of the natural gully. The outlet end of the branch blind ditch (2-2) is connected to the main blind ditch (2-1). Both the main blind ditch (2-1) and the branch blind ditch (2-2) are structures with a permeable filler covered with a reverse filter layer. S3. Construct a subbase (3-1) above the main blind drain (2-1) to level and compact the bottom surface of the slag yard; S4. Double-layer formwork is erected in sections on the subbase (3-1). Each section of double-layer formwork is connected sequentially along the upstream and downstream direction of the natural gully. Each section of double-layer formwork includes an inner formwork (5-1) and an outer formwork (5-2). The inner formwork (5-1) is a rigid structure. The inner side of the inner formwork (5-1) and the subbase (3-1) form a diversion tunnel (3-4). The axis of the diversion tunnel (3-4) is straight and slopes downstream of the natural gully. Grouting holes are provided at intervals on the inner formwork (5-1), and grouting cylinders (5-1) are fixed at the grouting holes. -1), the grouting cylinder (5-1-1) is located outside the inner mold (5-1); an outer mold (5-2) is provided outside the inner mold (5-1), the outer mold (5-2) is a bag, the bag has matching holes (5-2-1) that correspond one-to-one with the grouting cylinder (5-1-1), the grouting cylinder (5-1-1) is inserted into the matching hole (5-2-1) and temporarily sealed, the bag is filled with gas or liquid, and the thickness of the outer mold (5-2) is greater than the length of the part of the grouting cylinder (5-1-1) located outside the inner mold (5-1); S5. Slag (1) is piled on the outside and top of the double-layer template and compacted. At the same time, drainage piles (2-3) are arranged at intervals in the slag (1). The lower end of the drainage piles (2-3) is connected to the main blind ditch (2-1) or the branch blind ditch (2-2) to form a slag drainage network. Among them, the drainage piles (2-3) are structures with a filter layer wrapped around the permeable filler. S6. Grout is injected into the slag body (1) outside the outer mold (5-2) through the grouting hole of the inner mold (5-1) to form a continuous solid body (3-3) on the outer side of the outer mold (5-2). S7. Discharge the gas or liquid inside the outer mold (5-2), and then move the inner mold (5-1) out of the guide hole (3-4). S8. Construct lining (3-2) inside the solidified body (3-3) inside the diversion tunnel (3-4).

2. The construction method of the channel-type slag yard diversion structure as described in claim 1, characterized in that: In step S2, a sedimentation tank (4) is constructed on the upstream side of the slag yard. The upstream end of the main blind ditch (2-1) is located on the upstream side of the slag yard and is connected to the overflow port of the sedimentation tank (4). At least one drainage pipe (2-1-1) is also provided inside the main blind ditch (2-1). Each drainage pipe (2-1-1) is buried in the permeable filling material of the main blind ditch (2-1).

3. The construction method of the channel-type slag yard diversion structure as described in claim 2, characterized in that: In step S2, the drain pipe (2-1-1) is a perforated pipe.

4. The construction method of the channel-type slag yard diversion structure as described in claim 1, characterized in that: In step S3, the subbase (3-1) is divided into two layers vertically. The upper layer is a concrete layer and the lower layer is a sand and gravel layer. First, a sand and gravel layer is laid above the main blind drain (2-1). The width of the sand and gravel layer is greater than the width of the main blind drain (2-1), and the sand and gravel layer completely covers the main blind drain (2-1) vertically. Then, a concrete layer is constructed on top of the sand and gravel layer.

5. The construction method of the channel-type slag yard diversion structure as described in claim 1, characterized in that: In step S4, two adjacent inner mold sections (5-1) are provided with flanges (5-1-2) on the inner side of their ends, and the two flanges (5-1-2) are connected by bolts; the outer side of the joint of the adjacent outer molds (5-2) is also sealed by sealing tape (5-2-2).

6. The construction method of the channel-type slag yard diversion structure as described in claim 1, characterized in that: Step S4 also involves installing support rods (5-1-3) inside the inner mold (5-1).

7. The construction method of the channel-type slag yard diversion structure as described in any one of claims 1 to 6, characterized in that: The slag drainage network also includes connecting ditches (2-4). When filling the slag body (1) in step S5, connecting ditches (2-4) are also constructed in the slag body (1). The lower end of the drainage pile (2-3) is connected to the main blind ditch (2-1), the branch blind ditch (2-2) or the connecting ditch (2-4). The connecting ditch (2-4) is a structure with a filter layer wrapped around the permeable filler and is buried in the slag body (1). The main blind ditch (2-1), the branch blind ditch (2-2) and the connecting ditch (2-4) are all arranged downwards along the direction of water flow. The drainage piles (2-3) are arranged vertically. Each connecting ditch (2-4) is connected to at least two drainage piles (2-3). The lower end of the drainage pile (2-3) connected to the lower end of the connecting ditch (2-4) is connected to the main blind ditch (2-1) or the branch blind ditch (2-2).

8. The construction method of the channel-type slag yard diversion structure as described in any one of claims 1 to 6, characterized in that: In step S5, the upper end of the drainage pile (2-3) is sealed or covered with a filter layer, or a protective pipe is installed on the upper end of the drainage pile (2-3), with the top of the protective pipe being higher than the top surface of the slag body (1).

9. The construction method of the channel-type slag yard diversion structure as described in any one of claims 1 to 6, characterized in that: In step S4, the inner side of the inner mold (5-1) is shaped like a city gate. The bottom of the inner mold (5-1) is provided with a telescopic support seat (5-1-4). The lower end of the telescopic support seat (5-1-4) is equipped with a roller (5-1-5). When setting up the double-layer template, the telescopic support seat (5-1-4) is controlled to have a shortening allowance. Before moving the inner mold out of the guide hole in step S7, the telescopic support seat (5-1-4) is shortened, and then the inner mold (5-1) is moved out of the guide hole (3-4) by pulling the inner mold (5-1).

10. The construction method of the channel-type slag yard diversion structure as described in any one of claims 1 to 6, characterized in that: The construction method of the channel-type slag yard diversion structure also includes step S9: connecting the surface runoff upstream of the slag yard to the upstream end of the diversion tunnel (3-4), and sealing the upstream end of the main blind ditch (2-1).

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