A shallow geothermal energy utilization system for urban communities and a construction method thereof

Abstract

The application discloses a construction method of a shallow geothermal energy utilization system for urban communities, which comprises a pit foundation, wherein the pit foundation is sequentially provided with a bottom plate, a first soil layer, a pipe row, a first isolation layer, a second soil layer, a second isolation layer and a third soil layer from bottom to top; the pipe row forms a loop and is connected with a vertical ground-buried heat exchanger; the first isolation layer is laid by using an isolation layer laying device; and adjacent second isolation layers are fixed by a cross plate and a screw. The shallow geothermal energy utilization system can maximize the utilization of resources, meet the requirements of energy saving and environmental protection, and prolong the service life by reducing the damage rate of materials in construction by using the method. The isolation layer laying device is used in construction, so that the laid geomembrane is flat and beautiful, the burden of public personnel is reduced, and the geomembrane is convenient and easy to operate.

Description

Technical Field

[0001] This invention relates to a geothermal energy circulation system and a construction method thereof, and particularly to a shallow geothermal energy utilization system for urban communities and a construction method thereof. Background Technology

[0002] In modern urban community construction, underground space is utilized to the maximum extent, and the proportion of community green space is relatively large. Within the community green space area, the surface soil cover is thick, and the temperature of the deeper soil is more constant compared to the surface, with a significant temperature difference between winter and summer. Many communities are now developing shallow geothermal energy within their areas. During shallow geothermal energy construction, horizontal pipes are typically installed during backfilling within the community green space for shallow geothermal energy exchange. However, existing horizontal heat exchange pipe construction has the following drawbacks: because the roots of shallow plants are susceptible to water... The horizontally laid pipes caused damage, so we added an isolation layer above the pipes, namely a geomembrane. Due to the limited space between the pipes and the inner wall of the pit, workers could not stand inside the pit to lay the geomembrane or perform post-laying on the geomembrane. Moreover, the existing geomembrane was rolled up, and was large and heavy. During the laying, two workers had to hold the geomembrane and stand on both sides of the pipes to lay it. If the construction was not careful, the geomembrane would fall and cause compression damage to the pipes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a construction method for a shallow geothermal energy utilization system for urban communities, which avoids damage to the pipes caused by improper construction, improves the construction quality, and reduces the burden on the staff.

[0004] The technical solution adopted by this invention to solve the technical problem is as follows:

[0005] A shallow geothermal energy utilization system for urban communities includes a pit foundation, wherein the pit foundation is provided with a bottom plate, a first soil layer, a pipe bank, a first isolation layer, a second soil layer, a second isolation layer and a third soil layer from bottom to top; the pipe bank forms a loop and is connected to a vertical buried heat exchanger.

[0006] The pipe bank forms a loop and is connected to a vertically buried heat exchanger.

[0007] The first isolation layer is a geomembrane, and the second isolation layer is an isolation net.

[0008] The construction method for the shallow geothermal energy utilization system used in urban communities specifically includes the following steps:

[0009] A. Construction preparation:

[0010] ① Erect the drilling rig, determine the drilling location, and carry out foundation excavation;

[0011] ② While drilling, prepare for the installation of heat exchange tubes. Before installing the heat exchange tubes, a water pressure test must be performed on the heat exchange tubes. When installing the tubes, the heat exchange tubes must be filled with water and maintain a certain pressure. The installation speed must be uniform. After the heat exchange tubes are installed in the designated position, 1.5m of heat exchange tubes must be left on the bottom surface.

[0012] ③ The heat exchange tubes are backfilled using a reverse backfilling method. The filler is injected from the bottom of the borehole and backfilled upwards, gradually removing air to ensure there are no backfill gaps.

[0013] B. Construction of horizontal pipework:

[0014] ① Excavate the pit foundation outdoors, and mark the location of the pipe trench before excavation;

[0015] ② After excavation is completed, clean the bottom of the trench and manually compact it. After the bottom of the trench is leveled, lay the bottom plate on the bottom of the trench.

[0016] ③ After the base slab is laid, fill the base slab with the first layer of soil, which is 10cm thick. After filling, manually compact the soil.

[0017] ④ Lay pipe banks above the first soil layer, and connect the pipe banks to the heat exchange pipes;

[0018] ⑤ Use the isolation layer laying device to lay the geomembrane above the pipe bank. Before use, adjust the position of the first screw on the U-shaped frame, fix the two ends of the rolled geomembrane to the two second screws respectively, so as to avoid the bottom of the geomembrane pressing on the pipe bank, and ensure that the distance between the bottom of the pipe bank and the geomembrane is between 6cm and 10cm.

[0019] ⑥ After the geomembrane is fixed on the support assembly, place the end of the geomembrane outside the left end of pit A, with the geomembrane extending 10cm-20cm beyond the left end of pit A, and press the extended part down with bricks; move the base along the displacement plate so that the distance between the vertical rod and the U-shaped frame is 10cm; move the diagonal rod according to the position of the outer sides of the pipe row so that the roller at the bottom of the diagonal rod is positioned between the outer side of the pipe row and the inner wall of the pit; adjust the position of the third screw on the first horizontal plate so that the bottom of the pressure plate presses on the geomembrane; after adjustment, the worker holds the insertion rod and lays the geomembrane.

[0020] ⑦ After the geomembrane is laid, a second layer of soil is laid on top of the geomembrane, with a thickness of 10cm. After filling, manual compaction is carried out.

[0021] ⑧ After the second soil layer is laid, lay an isolation net on top of the second soil layer, and set a horizontal board and screws every 5cm in the pit foundation on both sides of the isolation net to fix the isolation net.

[0022] 9. After the isolation netting is laid, the third soil layer is laid. The thickness of the third soil layer is 10cm. After filling, manual compaction is carried out.

[0023] The isolation layer laying device comprises a base, a displacement plate, and a U-shaped frame. There are two bases, each L-shaped, symmetrically distributed on both sides of the pit foundation. Rollers are installed at the bottom of each base. A displacement plate is connected to each base by a sliding rod. An L-shaped connecting plate is positioned between the left ends of the two displacement plates. Two support rods are vertically mounted on the bottom plate of the connecting plate. A connecting column is positioned between the tops of the two support rods. A clamping assembly is mounted on the connecting column, consisting of a diagonal rod, a vertical rod, a sleeve, a first horizontal plate, and a second horizontal plate. A U-shaped frame is mounted on the base to the right of the clamping assembly. Two first screws are inserted into the top of the U-shaped frame and fixed to the U-shaped frame by first nuts. A support assembly is mounted at the bottom of each first screw, consisting of a first vertical plate and a second screw.

[0024] The connecting plate has a first rectangular through hole on its vertical plate; the positions of the two support rods correspond to the positions of the two ends of the U-shaped frame, and the two ends of the U-shaped frame are fixedly connected to the middle position of the top of the base; the outer side and bottom surface of the base have a first groove and a second groove, respectively; the upper end of the displacement plate is slidably connected to the first groove, and the lower end of the displacement plate is slidably connected to the second groove; two second vertical plates are provided on the left end of the displacement plate, and a roller is provided between the bottom of the two second vertical plates; the displacement plate is fixed to the base by bolts, and the bolts are located on the left side of the top of the base; there are two diagonal rods, and the left end of each diagonal rod is sleeved on a connecting post; a matching second nut is provided on the connecting post on both sides of each diagonal rod by thread; a vertical rod is provided at the bottom of the right end of each diagonal rod, and... The diagonal braces and vertical braces form a 135° angle, and the vertical braces are perpendicular to the pit foundation. A sleeve is fitted at the bottom of each vertical brace, and the sleeve is fixed to the vertical brace with bolts. A roller is installed at the bottom of each sleeve. A first horizontal plate is installed at the top of the inner side of each sleeve, and the first horizontal plate is perpendicular to the vertical brace. A third screw is vertically inserted into the end of each first horizontal plate, and the third screw is fixed to the first horizontal plate with a third nut. A pressure plate is installed at the bottom of each third screw. There are two vertical braces, and a plug is inserted between the tops of the two vertical braces, with both ends of the plug located on the outer side of the base. The two vertical braces are located between the inner walls on both sides of the pit foundation. A first vertical plate is fixedly connected to the bottom of each vertical brace, and a second screw is threaded onto each first vertical plate, with the second bolt penetrating the side of the first vertical plate.

[0025] The positive and beneficial effects of this invention are:

[0026] This invention, by setting a first isolation layer and a second isolation layer above the pipe bank, can prevent vegetation from damaging the pipe bank; at the same time, by using an isolation layer laying device for construction, it improves the efficiency of geomembrane laying and is aesthetically pleasing.

[0027] This invention maximizes resource utilization by setting up a shallow geothermal energy utilization system, meets the requirements of energy conservation and environmental protection, and reduces the damage rate of components during construction by using this method, thus extending their service life.

[0028] 3. By setting up a support component, the present invention fixes the rolled geomembrane to the second screw during use. With the use of the pressure plate, the geomembrane can be laid quickly and the laid geomembrane can be made very flat. The two first screws are fixed by the first nut. During use, the distance between the geomembrane and the pipe can be adjusted at any time according to the position of the pipe, so as to avoid damaging the pipe during the construction of the geomembrane.

[0029] 4. The left end of the diagonal bar of the present invention is fixed by the second nut. When in use, the position of the diagonal bar can be freely adjusted according to the position of both sides of the geomembrane. Then, the position between the pressure plate and the geomembrane can be adjusted according to the position of the pipe row. While laying the geomembrane, the workers use the pressure plate to make the geomembrane as flat as possible above the pipe row to avoid wrinkles during laying. The workers do not need to pull or adjust the geomembrane later. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of the pit foundation of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the present invention;

[0032] Figure 3 This is a partial structural schematic diagram of the clamping assembly of the present invention;

[0033] Figure 4 This is a schematic diagram of the displacement plate of the present invention;

[0034] Figure 5 for Figure 4 The left view;

[0035] Figure 6 This is a schematic diagram of the structure of the base of the present invention.

[0036] Among them, 1-base plate, 2-first soil layer, 3-pipe row, 4-first isolation layer, 5-second soil layer, 6-second isolation layer, 7-third soil layer, 8-base, 801-first groove, 802-second groove, 9-displacement plate, 10-roller, 11-connecting plate, 11-1 first rectangular through hole, 12-bolt, 13-support rod, 14-connecting column, 15-diagonal rod, 16-second nut, 18-vertical rod, 19-insertion rod, 20-sleeve, 21-U-shaped frame, 22-first screw, 23-first nut, 24-first vertical plate, 25-second screw, 26-first horizontal plate, 27-pressure plate, 28-third bolt, 29-third nut, 30-second vertical plate. Detailed Implementation

[0037] The invention will be further explained and described below with reference to the accompanying drawings:

[0038] Example 1: See Figure 1 A shallow geothermal energy utilization system for urban communities includes a pit foundation A. The pit foundation A is provided with a bottom plate 1, a first soil layer 2, a pipe array 3, a first isolation layer 4, a second soil layer 5, a second isolation layer 6, and a third soil layer 7 arranged sequentially from bottom to top. The thickness of the first soil layer 2, the second soil layer 5, and the third soil layer 7 is 10 cm. The pipe array 3 forms a loop and is connected to a vertical buried heat exchanger. The first isolation layer 4 is a geomembrane, and the second isolation layer 6 is an isolation net.

[0039] Example 2: See Figures 2-6 The construction method for the aforementioned shallow geothermal energy utilization system for urban communities specifically includes the following steps:

[0040] A. Construction preparation:

[0041] ① Erect the drilling rig, determine the drilling location, and carry out foundation excavation;

[0042] ② While drilling, prepare for the installation of heat exchange tubes. Before installing the heat exchange tubes, a water pressure test must be performed on the heat exchange tubes. When installing the tubes, the heat exchange tubes must be filled with water and maintain a certain pressure. The installation speed must be uniform. After the heat exchange tubes are installed in the designated position, 1.5m of heat exchange tubes must be left on the bottom surface.

[0043] ③ The heat exchange tubes are backfilled using a reverse backfilling method. The filler is injected from the bottom of the borehole and backfilled upwards, gradually removing air to ensure there are no backfill gaps.

[0044] B. Specific operating steps:

[0045] ① Excavation of pit A shall be carried out outdoors. Before excavation, the positioning and layout of the pipe trench shall be carried out.

[0046] ② After excavation is completed, clean the bottom of the trench and manually compact it. After the bottom of the trench is leveled, lay the bottom plate 1 on the bottom of the trench.

[0047] ③ After the base plate 1 is laid, the first soil layer 2 is filled on the base plate 1, and the thickness of the first soil layer 2 is 10cm. After filling, manual compaction is carried out.

[0048] ④ Lay pipe bank 3 above the first soil layer 2 and connect pipe bank 3 to heat exchange pipe;

[0049] ⑤ Use the isolation layer laying device to lay the geomembrane above the pipe bank. Before use, adjust the position of the first screw on the U-shaped frame, fix the two ends of the rolled geomembrane to the two second screws respectively, so as to avoid the bottom of the geomembrane pressing on the pipe bank, and ensure that the distance between the bottom of the pipe bank and the geomembrane is between 6cm and 10cm.

[0050] ⑥ After the geomembrane is fixed on the support assembly, place the end of the geomembrane outside the left end of pit A, with the geomembrane extending 10cm-20cm beyond the left end of pit A, and press the extended part down with bricks; move the base along the displacement plate so that the distance between the vertical rod and the U-shaped frame 21 is 10cm; move the diagonal rod according to the position of the outer sides of the pipe row so that the roller at the bottom of the diagonal rod is located between the outer side of the pipe row and the inner wall of the pit; adjust the position of the third screw on the first horizontal plate so that the bottom of the pressure plate presses on the geomembrane; after adjustment, the workers hold the insertion rod and lay the geomembrane.

[0051] ⑦ After the geomembrane is laid, a second layer of soil is laid on top of the geomembrane, with a thickness of 10cm. After filling, manual compaction is carried out.

[0052] ⑧ After the second soil layer is laid, lay an isolation net on top of the second soil layer, and set a screw every 5cm in the pit foundation on both sides of the isolation net to fix the isolation net.

[0053] 9. After the isolation netting is laid, the third soil layer is laid. The thickness of the third soil layer is 10cm. After filling, manual compaction is carried out.

[0054] The isolation layer laying device consists of a base, a displacement plate, and a U-shaped frame. There are two bases, each L-shaped, symmetrically distributed on both sides of the pit foundation. Rollers are installed at the bottom of each base, and a displacement plate is connected to each base via a sliding rod. An L-shaped connecting plate is positioned between the left ends of the two displacement plates. Two support rods are vertically mounted on the bottom plate of the connecting plate, and a connecting column is positioned between the tops of the two support rods. A clamping assembly is mounted on the connecting column, consisting of a diagonal rod, a vertical rod, a sleeve, a first horizontal plate, and a second horizontal plate. A U-shaped frame is mounted on the base to the right of the clamping assembly, with two first screws inserted into the top of the U-shaped frame and fixed to the U-shaped frame by first nuts. A support assembly is mounted at the bottom of each first screw, consisting of a first vertical plate and a second screw.

[0055] The connecting plate has a first rectangular through hole on its vertical plate; the positions of the two support rods correspond to the positions of the two ends of the U-shaped frame, and the two ends of the U-shaped frame are fixedly connected to the middle position of the top of the base; the outer side and bottom surface of the base have a first groove and a second groove, respectively; the upper end of the displacement plate is slidably connected to the first groove, and the lower end of the displacement plate is slidably connected to the second groove; two second vertical plates are provided at the left end of the displacement plate, and a roller is provided between the bottom of the two second vertical plates; the displacement plate is fixed to the base by bolts, and the bolts are located at the top left side of the base; there are two diagonal rods, and the left end of each diagonal rod is sleeved on a connecting post; a matching second nut is provided on the connecting post on both sides of each diagonal rod by thread; a vertical rod is provided at the bottom of the right end of each diagonal rod, and the diagonal rod... The vertical poles are arranged at a 135° angle to the pit foundation and are perpendicular to it. A sleeve is fitted at the bottom of each vertical pole and fixed to it with bolts. A roller is installed at the bottom of each sleeve. A first horizontal plate is installed at the top of the inner side of each sleeve, perpendicular to the vertical pole. A third screw is vertically inserted into the end of each first horizontal plate and fixed to it with a third nut. A pressure plate is installed at the bottom of each third screw. There are two vertical poles, with a plug inserted between their tops, the ends of which are located on the outer side of the base. The two vertical poles are located between the inner walls of both sides of the pit foundation. A first vertical plate is fixedly connected to the bottom of each vertical pole, and a second screw is threaded onto each first vertical plate, with the second bolt penetrating the side of the first vertical plate.

[0056] In the above description, the first screw 8 located above and below the top of the U-shaped frame 21 is respectively provided with a matching first nut 9.

[0057] In the above description, the roller at the bottom left end of the displacement plate and the roller at the bottom of the base are on the same horizontal plane.

[0058] In the above description, the pit A contains the laid pipes.

[0059] In the above description, the length of the two pressure plates is determined according to the width of the pit foundation, and the distance between the inner ends of the two pressure plates is 7-10cm.

[0060] In the above description, during use, the position of the sleeve 20 on the vertical rod is adjusted according to the depth of the pit foundation so that the tube wheel at the bottom of the sleeve is located at the bottom of the pit foundation, which serves to provide support and facilitate movement; during use, the staff only needs to hold the insertion rod and push the device to move.

[0061] When laying the geomembrane, the base moves along both sides of the pit foundation. The geomembrane is laid by moving the base. During the laying, the pressure plate presses on the geomembrane above the pipe row to ensure that the laid geomembrane is flat and wrinkle-free. The distance between the pressure plate and the U-shaped frame is adjusted by moving the displacement plate and the base. After adjustment, it is fixed with bolts.

[0062] In previous construction, workers often had to carry rolls of geomembrane for laying, which was time-consuming and labor-intensive. Two workers had to stand on both sides of the pit to walk and complete the laying. If they were not careful, the workers would step on the geomembrane, which would damage it. After the geomembrane was laid, the workers also had to flatten it in stages to meet the construction requirements. If there were large wrinkles in the geomembrane, it would affect the laying of the soil layer. The soil layer at the wrinkled area would be in a loose state, which would affect the construction quality.

[0063] In the above description, the overlap between adjacent isolation nets is 10cm, and the overlap is tied with wire. Then, a horizontal board is set at the overlap, and a screw is driven into the horizontal board so that the screw is inserted into the soil layer to fix the horizontal board.

[0064] In the above description, the backfilling method adopts reverse mud backfilling. In actual operation, the following methods can also be used: ① Manual backfilling: The backfill material is slowly filled into the borehole from all sides by hand. At the same time, water is intermittently injected into the hole to ensure that the filling material in the hole is as airtight as possible. However, due to the large amount of air and mud in the borehole, it is difficult to ensure that the backfill is compact. Generally, multiple replenishments are required after the first filling. ② Original mud backfilling: After completing one hole, when drilling the next hole, the circulating mud is allowed to flow through the previous hole with the casing. The sediment in the mud circulation process will settle in the hole. The part that cannot be filled on the surface is filled with backfill material to make it compact.

[0065] This invention maximizes resource utilization by setting up a shallow geothermal energy utilization system, meeting the requirements of energy conservation and environmental protection. Furthermore, the construction method reduces the damage rate of materials during construction and extends their service life. By using an isolation layer laying device, the laid geomembrane is flat and aesthetically pleasing, reduces the burden on workers, and is convenient and easy to use.

Claims

1. A construction method for a shallow geothermal energy utilization system for urban communities, comprising a shallow geothermal energy utilization system, the shallow geothermal energy utilization system comprising a pit foundation (A), the pit foundation (A) being provided with a bottom slab (1), a first soil layer (2), a pipe bank (3), a first isolation layer (4), a second soil layer (5), a second isolation layer (6), and a third soil layer (7) sequentially from bottom to top; the pipe bank (3) forming a loop and connected to a vertical buried heat exchanger; the thickness of the first soil layer (2), the second soil layer (5), and the third soil layer (7) is 10 cm; the first isolation layer (4) is a geomembrane, and the second isolation layer (6) is an isolation net, characterized in that, Specifically, the steps include the following: A. Construction preparation: ① Erect the drilling rig, determine the drilling location, and carry out foundation excavation; ② While drilling, prepare for the installation of heat exchange tubes. Before installing the heat exchange tubes, a water pressure test must be performed on the heat exchange tubes. When installing the tubes, the heat exchange tubes must be filled with water and maintain a certain pressure. The installation speed must be uniform. After the heat exchange tubes are installed in the designated position, 1.5m of heat exchange tubes must be left on the bottom surface. ③ The heat exchange tubes are backfilled using a reverse backfilling method. The filler is injected from the bottom of the borehole and backfilled upwards, gradually removing air to ensure there are no backfill gaps. B. Construction of horizontal pipework: ① Excavate the pit foundation (A) outdoors. Before excavation, position and mark out the pipe trench. ② After the excavation is completed, the bottom of the trench is cleaned and manually compacted. After the bottom of the trench is leveled, a base plate is laid on the bottom of the trench (1). ③ After the base plate (1) is laid, the first soil layer (2) is filled on the base plate (1), and the thickness of the first soil layer (2) is 10cm. After filling, manual compaction is carried out. ④ Lay a pipe bank (3) above the first soil layer (2) and connect the pipe bank (3) to the heat exchange pipe; ⑤ A geomembrane is laid above the pipe bank using an isolation layer laying device, wherein: the isolation layer laying device comprises a base, a displacement plate, and a U-shaped frame; there are two bases, both arranged in an L-shape, and the two bases are symmetrically distributed on both sides of the pit foundation; rollers are provided at the bottom of the bases, and a displacement plate is connected to each base by a sliding rod; an L-shaped connecting plate is provided between the left ends of the two displacement plates; two support rods are vertically arranged on the bottom plate of the connecting plate, and a connecting column is provided between the tops of the two support rods; a clamping assembly is provided on the connecting column, and the clamping assembly consists of a diagonal rod, a vertical rod, a sleeve, a first horizontal plate, and a second horizontal plate; a U-shaped frame is provided on the base to the right of the clamping assembly, and a U-shaped frame is inserted at the top of the U-shaped frame. Two first screws are provided, and the first screws are fixed to the U-shaped frame by first nuts; each first screw has a support assembly at its bottom, and the support assembly consists of a first vertical plate and a second screw; the vertical plate of the connecting plate has a first rectangular through hole; the positions of the two support rods correspond to the positions of the two ends of the U-shaped frame, and the two ends of the U-shaped frame are fixedly connected to the middle position of the top of the base; the outer side and bottom surface of the base are respectively provided with a first groove and a second groove, the upper end of the displacement plate is slidably connected to the first groove, the lower end of the displacement plate is slidably connected to the second groove, two second vertical plates are provided at the left end of the displacement plate, and a roller is provided between the bottom of the two second vertical plates. The displacement plate is fixed to the base with bolts located on the top left side of the base. There are two diagonal rods, each with its left end fitted onto a connecting post. Matching second nuts are threaded onto the connecting posts on both sides of each diagonal rod. A vertical rod is installed at the bottom right end of each diagonal rod, forming a 135° angle with the diagonal rod and perpendicular to the pit foundation. A sleeve is fitted at the bottom of each vertical rod and fixed to the vertical rod with bolts. A roller is installed at the bottom of each sleeve. A first horizontal plate is installed at the top inside each sleeve, perpendicular to the vertical rod. A third roller is vertically inserted into the end of each first horizontal plate. The system includes a screw rod, with the third screw rod fixed to the first horizontal plate via a third nut. A pressure plate is provided at the bottom of each of the third screw rods. There are two vertical rods, with an insert rod inserted between the tops of the two vertical rods, and the two ends of the insert rod are located on the outer side of the base. The two vertical rods are located between the inner walls on both sides of the pit foundation. A first vertical plate is fixedly connected to the bottom of each vertical rod, and a second screw rod is threaded onto each of the first vertical rods, with the second bolt penetrating the side of the first vertical plate. Before use, the position of the first screw rod on the U-shaped frame is adjusted, and the two ends of the rolled geomembrane are fixed to the two second screw rods to prevent the bottom of the geomembrane from pressing on the pipe bank, and to ensure that the distance between the pipe bank and the bottom of the geomembrane is between 6cm and 10cm. ⑥ After the geomembrane is fixed on the support assembly, place the end of the geomembrane outside the left end of pit A, with the geomembrane extending 10cm-20cm beyond the left end of pit A, and press the extended part down with bricks; move the base along the displacement plate so that the distance between the vertical rod and the U-shaped frame is 10cm; according to the position of the outer sides of the pipe row, move the diagonal rod so that the roller at the bottom of the diagonal rod is positioned between the outer side of the pipe row and the inner wall of the pit; adjust the position of the third screw on the first horizontal plate so that the bottom of the pressure plate presses on the geomembrane; after adjustment, the worker holds the insertion rod and lays the geomembrane. ⑦ After the geomembrane is laid, a second layer of soil is laid on top of the geomembrane, with a thickness of 10cm. After filling, manual compaction is carried out. ⑧ After the second soil layer is laid, lay an isolation net on top of the second soil layer, and set horizontal plates and screws every 5cm in the pit foundation on both sides of the isolation net to fix the isolation net.

9. After the isolation netting is laid, the third soil layer is laid. The thickness of the third soil layer is 10cm. After filling, manual compaction is carried out.

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