Fabricated lap joint type groove and construction method

Abstract

The invention relates to the technical field of groove construction, in particular to an assembly type lap joint groove and a construction method, and solves the problems that when an existing assembly type drainage groove is assembled and applied, gaps between grooves are inconvenient to fully fill with concrete, and the construction cost is low. And inclination and falling of the cover plate are easily caused by damage of the edge of the inner wall of the groove. Comprising a plurality of groove splicing units, each groove splicing unit is composed of a drainage groove and a plurality of groove cover plates, the groove cover plates are linearly arranged along the axis of the drainage groove, and external clamping grooves are formed in the two ends of the upper portion of the drainage groove; the two ends of the groove cover plate are inserted into the inner sides of the external clamping grooves and make contact with the drainage groove in an attached mode, and a lap joint frame strip is fixedly installed at the front end of the drainage groove. The concession grooves are formed in the two ends of the drainage grooves, so that the drainage grooves can be rapidly filled through the concession grooves during mutual splicing, stable installation of the cover plate can be kept, and falling is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of trench construction, and particularly to an assembled lap-type trench and a construction method thereof. Background Technique

[0002] A drainage trench is a facility for collecting and discharging rainwater and sewage, usually made of concrete materials. Its main function is to collect the water on the ground and guide the water flow to a designated discharge point through a certain slope. The structure of the drainage trench can be designed according to needs, and common shapes include semi-circular, rectangular, inverted trapezoidal or U-shaped. The choice of these shapes depends on specific drainage requirements and terrain conditions. The drainage trenches are usually connected by tongue-and-groove joints to ensure the stability and tightness of the connection. The drainage trenches are produced standardized through molds to ensure accurate dimensions and qualified strength, improving the construction efficiency and quality.

[0003] When assembling and applying the existing assembled drainage trenches, it is not convenient to fully fill the gaps between the trenches with concrete, and due to the damage of the inner wall edges of the trenches, the covers are prone to tilt and fall; therefore, it does not meet the existing requirements, and for this reason, we propose an assembled lap-type trench and a construction method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide an assembled lap-type trench and a construction method thereof, so as to solve the problems mentioned in the above background technique that when assembling and applying the existing assembled drainage trenches, it is not convenient to fully fill the gaps between the trenches with concrete, and due to the damage of the inner wall edges of the trenches, the covers are prone to tilt and fall.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An assembled lap-type trench, including a plurality of trench splicing units, the trench splicing units are composed of drainage trenches and a plurality of trench covers, the plurality of trench covers are linearly arranged along the axis of the drainage trench, external card slots are provided at both ends of the upper part of the drainage trench, both ends of the trench cover are inserted into the inner side of the external card slot and are in close contact with the drainage trench, a lap frame bar is fixedly installed at the front end of the drainage trench, a first recessed groove is provided inside the lap frame bar, a second recessed groove is provided at the rear end of the drainage trench, and a splicing and pouring cavity is formed between two adjacent first recessed grooves and second recessed grooves.

[0006] Preferably, a plurality of kidney-shaped water leakage holes are provided on the upper end surface of the trench cover, the plurality of kidney-shaped water leakage holes are linearly arranged along the side of the trench cover, and the cross-section of the kidney-shaped water leakage hole is trapezoidal.

[0007] Preferably, a splicing gap is formed between every two adjacent trench covers. Positioning bumps are fixedly provided in the middle of both ends of the trench cover. The two positioning bumps are symmetrically installed with respect to the trench cover. The trench cover and the two positioning bumps are integrally cast. A plurality of longitudinal positioning grooves are provided on one side of the external card slot. The positioning bump is inserted into the inner side of the longitudinal positioning groove. The width dimension of the longitudinal positioning groove is greater than the width dimension of the positioning bump.

[0008] Preferably, the installation position and size of the drainage trench are measured by a total station. The drainage trench is installed inside the foundation trench. The inner wall of the bottom of the foundation trench is rammed by a rammer. The rear end of one of the drainage trenches is inserted into the inner side of the overlapping frame bar and is in close contact with the front end of another drainage trench. Two adjacent drainage trenches are coaxial.

[0009] Preferably, a plurality of reinforcing rib strips are fixedly provided on the outer surface of the drainage trench. A casting steel reinforcement cage is fixedly installed inside the drainage trench. The casting steel reinforcement cage is composed of an outer U-shaped steel bar frame, an inner U-shaped steel bar frame, and a plurality of corner steel bars. The inner U-shaped steel bar frame is located inside the outer U-shaped steel bar frame.

[0010] Preferably, a plurality of the corner steel bars are linearly arranged between the outer U-shaped steel bar frame and the inner U-shaped steel bar frame. The outer U-shaped steel bar frame, the inner U-shaped steel bar frame, and a plurality of corner steel bars are welded and fixed. Both the outer U-shaped steel bar frame and the inner U-shaped steel bar frame are composed of a plurality of longitudinal steel bars and a plurality of U-shaped steel bars. The contact nodes of the plurality of longitudinal steel bars and the U-shaped steel bars are all welded and fixed. The drainage trench, the overlapping frame bar, a plurality of reinforcing rib strips, and the casting steel reinforcement cage are integrally cast. The compressive strength of the trench splicing unit is 300 MPa - 400 MPa.

[0011] Preferably, a plurality of linearly arranged filter boxes are provided inside the drainage trench. The drainage trench and the plurality of filter boxes are inserted and installed. Filter nets are fixedly installed on both sides of the filter box. Filter sand is filled between two adjacent filter nets inside the filter box.

[0012] A construction method for an assembled overlapping type trench, comprising the following steps: S1: Use a total station to measure the installation position and size of the drainage trench. After determining the installation depth of the drainage trench (201), use construction machinery to excavate the foundation trench along the lime line. After the foundation trench is formed, use a rammer to preliminarily ram the inner wall of the bottom of the foundation trench and sprinkle a gravel layer. Lift and install the precast and cast drainage trench into the inner side of the foundation trench, and keep the drainage trench coaxial with the foundation trench; S2: Then, the remaining multiple drainage grooves are linearly arranged and placed inside the foundation trench in the same way, so that every two adjacent drainage grooves are spliced and assembled. Specifically, a lapping frame bar is installed at one end of the drainage groove, so that one end of one drainage groove is inserted into the inside of the lapping frame bar of another drainage groove. At this time, the first retreat groove and the second retreat groove in two adjacent drainage grooves form a splicing and pouring cavity, and the gap between two adjacent drainage grooves is determined according to the expansion and contraction amount of the drainage groove; S3: Then, manually inject concrete into the inside of the splicing and pouring cavity, thereby realizing the pouring and splicing of multiple drainage grooves. External clamping grooves are provided at both ends of the upper part of the drainage groove, so that when multiple groove covers cover the upper end of the drainage groove, they are horizontally positioned through the external clamping grooves; S4: A plurality of longitudinal positioning grooves are provided on one side of the external clamping groove. The positioning convex block is inserted into the inside of the longitudinal positioning groove. The longitudinal positioning groove can longitudinally limit the groove cover plate, and the width dimension of the longitudinal positioning groove is larger than the width dimension of the positioning convex block. Therefore, the groove cover plate can longitudinally fine-tune inside the longitudinal positioning groove through the positioning convex block to adjust the splicing gap size between two adjacent groove cover plates, meeting the rapid installation of multiple groove cover plates; S5: At the same time, the external clamping groove is located at the edge of the upper part of the drainage groove. When the upper part of the drainage groove is damaged, the external clamping groove can prevent the groove cover plate from separating from the drainage groove and falling into the inside of the drainage groove. After the groove cover plate is installed, backfill and compact the two sides between the foundation trench and the drainage groove.

[0013] Preferably, the cross-section of the foundation trench in S1 is a trapezoid with a narrow bottom and a wide top, and the thickness of the gravel layer is 5 cm.

[0014] Preferably, the concrete strength of the drainage groove is C30, and the concrete strength of the groove cover plate is C25.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, a first retreat groove and a second retreat groove are respectively provided at both ends of the drainage groove, so that the first retreat groove and the second retreat groove form a splicing and pouring cavity when the drainage grooves are spliced and assembled. Furthermore, it is convenient to quickly fill the concrete through the splicing and pouring cavity, improving the splicing strength of the drainage groove. At the same time, a pouring steel reinforcement cage is provided inside the drainage groove, so that the strength of the drainage groove can be effectively enhanced through the pouring steel reinforcement cage, avoiding damage caused by lateral soil pressure; 2. The present invention is provided with external card slots at the edges of both ends of the drainage groove, enabling the lateral positioning of the groove cover plate through the external card slots. At the same time, when the inner wall edge of the drainage groove is damaged, it can prevent the groove cover plate from detaching from the drainage groove, avoiding the inclination or falling of the groove cover plate, enhancing the installation strength of the groove cover plate. Meanwhile, the longitudinal positioning groove can longitudinally position the groove cover plate, facilitating the adjustment of the spacing between adjacent groove cover plates and reducing the installation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the groove splicing unit of the present invention; Figure 2 is a schematic sectional structural view of the groove splicing unit of the present invention; Figure 3 is a schematic structural view of the groove cover plate of the present invention; Figure 4 is an exploded structural view of the drainage groove of the present invention; Figure 5 is a front view of the cast-in-place steel reinforcement cage of the present invention; Figure 6 is an exploded structural view of the cast-in-place steel reinforcement cage of the present invention; Figure 7 is a splicing schematic view of two drainage grooves of the present invention; Figure 8 is a partial splicing schematic view of two groove splicing units of the present invention; Figure 9 is an installation structural view of the filter box of the present invention.

[0017] In the figures: 1. Groove splicing unit; 201. Drainage groove; 202. Lapping frame strip; 203. First recession groove; 204. Reinforcing rib; 205. Second recession groove; 206. External card slot; 207. Longitudinal positioning groove; 208. Splicing casting cavity; 301. Groove cover plate; 302. Waist-shaped water leakage hole; 303. Positioning convex block; 304. Splicing gap; 401. Cast-in-place steel reinforcement cage; 402. Outer U-shaped steel reinforcement frame; 403. Inner U-shaped steel reinforcement frame; 404. Corner steel bar; 501. Filter box; 502. Filter net. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Please refer to Figure 1 、 Figure 3 、 Figure 7 and Figure 8, an embodiment provided by the present invention: an assembled lap-type groove, including a plurality of groove splicing units 1. The groove splicing unit 1 is composed of a drainage groove 201 and a plurality of groove covers 301. External clamping grooves 206 are provided at both ends of the upper part of the drainage groove 201. Both ends of the groove cover 301 are inserted into the inner side of the external clamping groove 206 and are in close contact with the drainage groove 201. A splicing gap 304 is formed between every two adjacent groove covers 301. Positioning bumps 303 are fixedly provided in the middle of both ends of the groove cover 301. The two positioning bumps 303 are symmetrically installed relative to the groove cover 301. The groove cover 301 and the two positioning bumps 303 are integrally cast. A plurality of longitudinal positioning grooves 207 are provided on one side of the external clamping groove 206. The positioning bumps 303 are inserted into the inner side of the longitudinal positioning grooves 207. The width dimension of the longitudinal positioning grooves 207 is larger than the width dimension of the positioning bumps 303. The longitudinal positioning of the groove cover 301 can be achieved through the longitudinal positioning grooves 207. Furthermore, the groove cover 301 can be longitudinally fine-tuned through the positioning bumps 303 inside the longitudinal positioning grooves 207 to adjust the size of the splicing gap 304 between two adjacent groove covers 301.

[0020] Please refer to Figure 2 , Figure 3 and Figure 8 , a plurality of reinforcing ribs 204 are fixedly provided on the outer surface of the drainage groove 201. The concrete strength of the drainage groove 201 is C30, and the concrete strength of the groove cover 301 is C25. A lapping frame strip 202 is fixedly installed at the front end of the drainage groove 201. A first retraction groove 203 is provided inside the lapping frame strip 202. A second retraction groove 205 is provided at the rear end of the drainage groove 201. The installation position and size of the drainage groove 201 are measured by a total station. The drainage groove 201 is installed inside the foundation trench, and the inner wall of the bottom of the foundation trench is tamped by a rammer. The rear end of one drainage groove 201 is inserted into the inner side of the lapping frame strip 202 and is in close contact with the front end of another drainage groove 201. Two adjacent drainage grooves 201 are coaxial. A splicing pouring cavity 208 is formed between two adjacent first retraction grooves 203 and the second retraction groove 205. The splicing pouring cavity 208 facilitates the rapid filling of concrete and improves the splicing strength of the drainage groove 201.

[0021] Please refer to Figures 1 to 3 , a plurality of groove covers 301 are linearly arranged along the axis of the drainage groove 201. A plurality of waist-shaped water leakage holes 302 are provided on the upper end surface of the groove cover 301. The plurality of waist-shaped water leakage holes 302 are linearly arranged along the side of the groove cover 301. The cross-section of the waist-shaped water leakage hole 302 is trapezoidal. The waist-shaped water leakage holes 302 facilitate the leakage of rainwater.

[0022] Please refer to Figures 4 to 6, a cast-in-place steel reinforcement cage 401 is fixedly installed inside the drainage groove 201. The cast-in-place steel reinforcement cage 401 is composed of an outer U-shaped steel bar frame 402, an inner U-shaped steel bar frame 403, and multiple corner steel bars 404. The inner U-shaped steel bar frame 403 is located inside the outer U-shaped steel bar frame 402. The multiple corner steel bars 404 are linearly arranged between the outer U-shaped steel bar frame 402 and the inner U-shaped steel bar frame 403. The outer U-shaped steel bar frame 402, the inner U-shaped steel bar frame 403, and the multiple corner steel bars 404 are welded and fixed. Both the outer U-shaped steel bar frame 402 and the inner U-shaped steel bar frame 403 are composed of multiple longitudinal steel bars and multiple U-shaped steel bars. The contact nodes of the multiple longitudinal steel bars and the U-shaped steel bars are all welded and fixed. The drainage groove 201, the lapping frame strip 202, the multiple reinforcing rib strips 204, and the cast-in-place steel reinforcement cage 401 are integrally cast. The compressive strength of the groove splicing unit 1 is 300 MPa - 400 MPa. Through the cast-in-place steel reinforcement cage 401, the strength of the drainage groove can be effectively enhanced, avoiding damage caused by lateral soil pressure.

[0023] Please refer to Figure 9 , multiple linearly arranged filter boxes 501 are provided inside the drainage groove 201. The drainage groove 201 is inserted and installed with the multiple filter boxes 501. Filter nets 502 are fixedly installed on both sides of the filter box 501. Filter sand is filled between adjacent two filter nets 502 inside the filter box 501. By installing the filter nets 502 and the filter sand through the filter box 501, the filter operation can be carried out when the sewage is conveyed in the drainage groove 201 through the filter nets 502 and the filter sand. The adjacent two filter nets 502 in the filter box 501 can keep the filter sand stable.

[0024] A construction method for an assembled lapping type groove includes the following steps: S1: Use a total station to measure the installation position and size of the drainage groove 201. After determining the installation depth of the drainage groove (201), use construction machinery to excavate the foundation trench along the lime line. After the foundation trench is formed, use a rammer to preliminarily compact the inner wall of the bottom of the foundation trench and sprinkle a gravel layer. Lift and install the precast and cast-in-place drainage groove 201 into the inner side of the foundation trench, keeping the drainage groove 201 coaxial with the foundation trench; S2: Then, use the same method to linearly arrange the remaining multiple drainage grooves 201 inside the foundation trench, so that every two adjacent drainage grooves 201 are spliced and assembled with each other. Specifically, a lapping frame strip 202 is installed at one end of the drainage groove 201, so that one end of one drainage groove 201 is inserted into the inner side of the lapping frame strip 202 of another drainage groove 201. At this time, the first retraction groove 203 and the second retraction groove 205 in two adjacent drainage grooves 201 form a splicing and casting cavity 208, and determine the gap between two adjacent drainage grooves 201 according to the expansion and contraction amount of the drainage groove 201; S3: Then manually inject concrete into the inner side of the splicing and pouring cavity 208, thereby realizing the pouring and splicing of multiple drainage grooves 201. External card slots 206 are provided at both ends of the upper part of the drainage groove 201, so that when multiple groove covers 301 cover the upper end of the drainage groove 201, horizontal positioning is carried out through the external card slots 206; S4: A plurality of longitudinal positioning grooves 207 are provided on one side of the external card slot 206. The positioning protrusions 303 are inserted into the inner side of the longitudinal positioning grooves 207. The longitudinal positioning grooves 207 can longitudinally limit the groove covers 301, and the width dimension of the longitudinal positioning grooves 207 is greater than the width dimension of the positioning protrusions 303. Thus, the groove covers 301 can longitudinally fine-tune inside the longitudinal positioning grooves 207 through the positioning protrusions 303 to adjust the size of the splicing gap 304 between two adjacent groove covers 301, meeting the rapid installation of multiple groove covers 301; S5: At the same time, the external card slot 206 is located at the edge of the upper part of the drainage groove 201. When the upper part of the drainage groove 201 is damaged, the external card slot 206 can prevent the groove cover 301 from detaching from the drainage groove 201 and falling into the inner side of the drainage groove 201. After the groove cover 301 is installed, backfill and compact the two sides between the foundation trench and the drainage groove 201.

[0025] Among them, the cross-section of the foundation trench is a trapezoid with a narrower bottom and a wider top, and the thickness of the gravel layer is 5 cm. Laying the gravel layer after ramming the foundation trench can effectively improve the installation stability and seepage effect of the drainage groove 201.

[0026] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

Claims

1. An assembled lap-type groove, comprising a plurality of groove splicing units (1), the groove splicing unit (1) is composed of a drainage groove (201) and a plurality of groove covers (301), and the plurality of groove covers (301) are linearly arranged along the axis of the drainage groove (201), characterized in that: External card slots (206) are provided at both ends of the upper part of the drainage groove (201). Both ends of the groove cover plate (301) are inserted into the inner sides of the external card slots (206) and are in close contact with the drainage groove (201). A lapping frame strip (202) is fixedly installed at the front end of the drainage groove (201). A first relief groove (203) is provided inside the lapping frame strip (202). A second relief groove (205) is provided at the rear end of the drainage groove (201). A splicing and pouring cavity (208) is formed between two adjacent first relief grooves (203) and second relief grooves (205).

2. The prefabricated lapped groove according to claim 1, wherein: A plurality of kidney-shaped water leakage holes (302) are provided on the upper end surface of the groove cover plate (301). The plurality of kidney-shaped water leakage holes (302) are linearly arranged along the side of the groove cover plate (301). The cross-section of the kidney-shaped water leakage hole (302) is trapezoidal.

3. The prefabricated overlapping type groove according to claim 2, characterized in that: A splicing gap (304) is formed between every two adjacent groove cover plates (301). Positioning bumps (303) are fixedly provided in the middle of both ends of the groove cover plate (301). The two positioning bumps (303) are symmetrically installed relative to the groove cover plate (301). The groove cover plate (301) and the two positioning bumps (303) are integrally cast. A plurality of longitudinal positioning grooves (207) are provided on one side of the external card slot (206). The positioning bumps (303) are inserted into the inner sides of the longitudinal positioning grooves (207). The width dimension of the longitudinal positioning groove (207) is larger than the width dimension of the positioning bump (303).

4. The prefabricated lapped groove according to claim 3, characterized in that: The installation position and size of the drainage groove (201) are measured by a total station. The drainage groove (201) is installed inside the foundation trench. The inner wall of the bottom of the foundation trench is rammed by a rammer. The rear end of one of the drainage grooves (201) is inserted into the inner side of the lapping frame strip (202) and is in close contact with the front end of another drainage groove (201). Two adjacent drainage grooves (201) are coaxial.

5. The prefabricated lapped groove according to claim 4, characterized in that: A plurality of reinforcing rib strips (204) are fixedly provided on the outer surface of the drainage groove (201). A casting steel reinforcement cage (401) is fixedly installed inside the drainage groove (201). The casting steel reinforcement cage (401) is composed of an outer U-shaped steel bar frame (402), an inner U-shaped steel bar frame (403) and a plurality of corner steel bars (404). The inner U-shaped steel bar frame (403) is located inside the outer U-shaped steel bar frame (402).

6. The prefabricated lapped groove according to claim 5, characterized in that: A plurality of the corner steel bars (404) are linearly arranged between the outer U-shaped steel bar frame (402) and the inner U-shaped steel bar frame (403). The outer U-shaped steel bar frame (402), the inner U-shaped steel bar frame (403) and the plurality of corner steel bars (404) are welded and fixed. Both the outer U-shaped steel bar frame (402) and the inner U-shaped steel bar frame (403) are composed of a plurality of longitudinal steel bars and a plurality of U-shaped steel bars. The contact nodes of the plurality of longitudinal steel bars and the U-shaped steel bars are all welded and fixed. The drainage groove (201), the lapping frame strip (202), the plurality of reinforcing rib strips (204) and the cast-in-place steel bar cage (401) are integrally cast. The compressive strength of the groove splicing unit (1) is 300 MPa - 400 MPa.

7. The prefabricated lapped groove according to claim 6, characterized in that: A plurality of linearly arranged filter boxes (501) are arranged inside the drainage groove (201). The drainage groove (201) is inserted and installed with the plurality of filter boxes (501). Filter nets (502) are fixedly installed on both sides of the filter box (501). Filter sand is filled between two adjacent filter nets (502) inside the filter box (501).

8. A construction method for an assembled lap-type groove, based on the assembled lap-type groove described in claim 7, characterized in that, It includes the following steps: S1: Use a total station to measure the installation position and size of the drainage groove (201). After determining the installation depth of the drainage groove (201), use construction machinery to excavate the foundation trench along the lime line. After the foundation trench is formed, use a rammer to preliminarily tamp the inner wall of the bottom of the foundation trench and sprinkle a gravel layer. Hoist the precast and cast-in-place drainage groove (201) to the inside of the foundation trench, and keep the drainage groove (201) coaxial with the foundation trench. S2: Then, use the same method to linearly arrange the remaining plurality of drainage grooves (201) inside the foundation trench, so that every two adjacent drainage grooves (201) are spliced and assembled with each other. Specifically, a lapping frame strip (202) is installed at one end of the drainage groove (201), so that one end of one drainage groove (201) is inserted into the inside of the lapping frame strip (202) of another drainage groove (201). At this time, the first recess (203) and the second recess (205) in two adjacent drainage grooves (201) form a splicing and casting cavity (208), and determine the gap between two adjacent drainage grooves (201) according to the expansion and contraction amount of the drainage groove (201). S3: Then manually inject concrete into the inside of the splicing and casting cavity (208), thereby realizing the casting and splicing of the plurality of drainage grooves (201). External card slots (206) are arranged at both ends of the upper part of the drainage groove (201), so that when a plurality of groove covers (301) cover the upper end of the drainage groove (201), lateral positioning is carried out through the external card slots (206). S4: A plurality of longitudinal positioning grooves (207) are provided on one side of the external card slot (206). The positioning bump (303) is inserted into the inner side of the longitudinal positioning groove (207). The longitudinal positioning groove (207) can longitudinally limit the groove cover plate (301). Moreover, the width dimension of the longitudinal positioning groove (207) is larger than the width dimension of the positioning bump (303). Thus, the groove cover plate (301) can longitudinally fine-tune through the positioning bump (303) inside the longitudinal positioning groove (207) to adjust the size of the splicing gap (304) between two adjacent groove cover plates (301), meeting the rapid installation of multiple groove cover plates (301). S5: At the same time, the external card slot (206) is located at the upper edge of the drainage groove (201). When the upper part of the drainage groove (201) is damaged, the external card slot (206) can prevent the groove cover plate (301) from detaching from the drainage groove (201) and falling into the inner side of the drainage groove (201). After the groove cover plate (301) is installed, backfill and compact the two sides between the base groove and the drainage groove (201).

9. The construction method of an assembled lap-type groove according to claim 8, characterized in that: The cross-section of the base groove in S1 is a trapezoid with a narrow bottom and a wide top, and the thickness of the gravel layer is 5 cm.

10. The construction method of an assembled lap-type groove according to claim 8, characterized in that: The concrete strength of the drainage groove (201) is C30, and the concrete strength of the groove cover plate (301) is C25.

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