Sand gravel stratum anti-impact wall grooving equipment and self-adaptive grooving method

Abstract

The invention relates to the technical field of sand gravel stratum foundation construction, in particular to sand gravel stratum scour prevention wall grooving equipment and a self-adaptive grooving method, and aims to solve the technical problem that large-range groove milling in the prior art easily causes production safety due to uncertain properties of a sand gravel stratum. The groove body is located on a stable supporting system constructed by the groove edge prefabricating assembly and the pouring positioning assembly on the side of the width of the groove body, a loose space of a gravel layer generates vibration and impact along with contact between a reciprocating groove milling assembly head and the gravel layer, flowing of the surrounding gravel layer is intensified, slurry can flow out step by step when groove milling is not conducted, and therefore the effect that the groove body is not subjected to groove milling is achieved. Under the interception of the interception template, the gravel layer on the width side of the actual groove body is more compact and stable, so that the safety is greatly improved; and after the groove type is detected, the groove edge prefabricating assembly and the pouring positioning assembly also provide a positioning foundation and a fixing foundation for prefabricating and pouring, so that the construction process is safer and more reliable.

Description

Technical Field

[0001] This invention relates to the field of foundation construction technology for gravel strata, and particularly to a trenching device and adaptive trenching method for erosion control walls in gravel strata. Background Technology

[0002] The gravel and sand stratum foundation construction technology is used in foundation treatment construction involving the construction of anti-scour walls, and is used to treat the construction of concrete anti-scour walls for the treatment of identified seepage channels; the gravel and sand stratum mentioned in this application refers to a loose mixture composed of sand grains with a particle size of 0.074 to 2 mm and gravel larger than 2 mm; the trenching involved refers to the construction process of trenching and wall construction, which involves excavating a narrow and long deep trench, pouring concrete (sometimes with steel cages or precast components placed before pouring) or other materials in the trench to build an underground continuous wall as an anti-scour wall. The function of scour walls also includes diaphragm walls in permeable strata of water-retaining structures, used to control seepage, reduce seepage flow, and ensure seepage stability of structures and foundations. It is an effective measure to solve seepage problems in deep overburden layers.

[0003] Compared with other similar engineering measures, such as sheet piles and grouting, anti-scouring walls have reliable structures, good seepage prevention effects, can adapt to various geological conditions, and are almost unaffected by groundwater levels during construction.

[0004] The main steps of the existing grooved wall construction process are as follows: At the construction site, two or more sets of guide trenches are first excavated, passing through the marked center point. The purpose of the guide trenches is to determine the location of the excavation. Due to the large width of the trench and the influence of the geological environment, the excavation is not carried out in a disorderly manner. The position between the guide trenches is used as a reference for the preliminary excavation. Subsequently, the excavation methods include various formations, such as reserving the middle section and excavating deep trenches along both sides while gradually excavating and reserving the middle section; or a step-by-step excavation method, which requires investigation of the actual geological conditions and evaluation and design of a special plan; the final construction is completed by the commonly used on-site casting method for reinforced concrete guide walls. The main equipment used was a drilling and grabbing excavator to excavate the trench, followed by a trench washing machine to treat the trench walls, and finally the trench was measured. In the aforementioned construction process of trenching and wall building, the steps most prone to problems are after trenching and before measurement. Due to the characteristics of gravel strata, even after measurement is completed, grout seepage on the trench wall is likely to occur after construction. The flow of gravel between layers can cause the trench to lose the trench shape formed by excavation, and there is a potential danger. Since drilling is used as the basic method of excavation, these problems mostly occur after the trenching machine has milled the trench and expanded the edges. That is, after milling, the stability of the trench shape can only be controlled by the actual geological conditions, and unexpected situations cannot be actively eliminated or controlled. Summary of the Invention

[0005] The present invention aims to solve the technical problem in the prior art that large-scale milling is prone to production safety issues due to the uncertain properties of gravel strata, and provides a trenching device and adaptive trenching method for anti-scour walls in gravel strata.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A trenching device for erosion control walls in gravel strata, which first excavates the trench using a brick-gripping method with guide holes, includes: A prefabricated edge assembly is arranged on the width side of the trench body, closely attached to the gravel stratum. The prefabricated edge assembly includes an intercepting template and a forming outlet. On the width side of the groove, the intercepting template and the forming outlet are arranged alternately. It also includes: an injection positioning assembly having a columnar injection body and a positioning connecting component, the positioning connecting component being able to form a fixed connection with the groove edge prefabrication assembly and being used to stabilize the groove edge prefabrication assembly; and A reciprocating milling groove assembly head is connected to the liftable suspension end of a lifting device. The reciprocating milling groove assembly head is connected to a guide frame. The guide frame can move up and down along the height direction of the groove edge prefabricated assembly, and the up and down movement is controlled by the lifting device. The reciprocating milling assembly head has a reciprocating working end capable of producing up and down movements. This working end can enter the gravel stratum from the forming outlet portion to perform its reciprocating movements, so that the intercepting template acts as a pressure-bearing component on the width side of the groove.

[0007] Preferably, the groove edge prefabricated component further includes: The square tube body has a square cross-section and an internal tube channel; An anchoring end with a hole at its bottom, the anchoring end being connected to the second end of the square tube body and communicating with the inner tube channel; The anchoring end is inserted into the bottom of the groove body; The square tube body has U-shaped splicing joints symmetrically arranged on its four sides; The U-shaped splicing interfaces between adjacent square tube bodies form a splicing structure.

[0008] Preferably, the interception template includes: An interception template body, wherein water outlet sieve holes are constructed on the interception template body; The interceptor template body has splicing connection parts on both sides, and the splicing connection parts can be inserted into the splicing structure part; The interception template comprises multiple templates, which are sequentially inserted into the splicing structure.

[0009] Preferably, the height of the columnar injection body is less than the height of the square tube body; The cylindrical infusion body has an insertion end at its lower part, and the cylindrical infusion body is constructed as a hollow tube, with radially arranged radial outlet holes; and The stable connection support arm is constructed as an isosceles trapezoidal frame structure. One side of the arm is fixedly connected to the lower end of the columnar injection body, and the other end has a U-shaped insertion part that can be inserted into the U-shaped splice interface of the square tube body facing the corresponding columnar injection body.

[0010] Preferably, the positioning connection component includes: Anchor tip, which is fixedly connected to the first limiting body; The second limiting body is fixedly connected to the first limiting body via a surrounding post; The winding column can be connected to a steel wire rope, which can also be fixedly connected to a radial connecting hook of the columnar injection body.

[0011] Preferably, the reciprocating milling groove assembly head includes: The first and second milling groove bodies are respectively connected to the two ends of a reciprocating rod body; A preset angle is formed between the first milled groove body and the second milled groove body; The ends of the first milling groove body and the second milling groove body serve as the working ends of the milling groove; The first milled groove body is located below the second milled groove body.

[0012] Preferably, the reciprocating milling groove assembly head further includes: The rail connection limiting part forms a rail connection groove, and the rod of the reciprocating rod body forms a rail connection with the rail connection limiting part; The rotating fixed block forms a fixed connection with the rail connection limiting part through the connecting frame; A motor bracket frame is provided above the rotating fixed block; A rotating shaft is provided on the rotating fixed block; A working motor coaxial with the rotating shaft is mounted on the motor bracket frame; The output end of the working motor is connected to the rotating shaft and drives the rotating shaft to rotate. The other end of the rotating shaft is connected to a reciprocating arm; The reciprocating arm is rotatably connected to a limiting slider, which is disposed within the strip groove formed by the first milling body.

[0013] Preferably, the guide frame includes: A sliding insert has two sliding ends, each end having a sliding component that adapts to the shape of the U-shaped splice. The sliding insert is arranged on the outlet, and a space is formed between the ends of the sliding insert. The sliding insert is fixedly connected by a supporting connector; The supporting connector is provided with a mounting position, which is used to connect to the combined bracket provided on the side of the rail connection limiting part; The supporting connector is also provided with a docking connection part, which is used to detachably connect to the working end of the lifting device.

[0014] Preferably, the ends of the first milling body and the second milling body can be detachably connected to a milling tooth, the milling tooth being adapted to the arcuate arrangement of the ends of the first milling body and the second milling body.

[0015] The adaptive trenching method using the aforementioned trenching equipment for erosion control walls in gravel formations includes the following steps: Step 1: Excavate the trench using drilling and grabbing machinery, perform initial milling on the trench using milling machinery, arrange the grouting positioning components, form a support system mainly composed of trench edge prefabricated components and grouting positioning components through the cooperation of the U-shaped splicing interface of the square tube body, install the interception template, and reserve the forming outlet. Step 2: Assemble the reciprocating milling groove assembly head, arrange the guide frame, and fit the guide frame with the U-shaped splice at the forming outlet to form a liftable guide; Step 3: After connecting the docking part to the lifting device, control the lifting action of the reciprocating milling groove assembly head by lifting the lifting device, start the working motor, and put the first milling groove body and the second milling groove body into working state.

[0016] The present invention has the following beneficial effects: The tank is supported by a stable system built on the side of its width by prefabricated tank edge components and grouting positioning components. This minimizes the impact of the surrounding gravel layer on the tank. When the tank wall is damaged by "scratching", it is equivalent to extending the head of the reciprocating milling component into the tank wall, i.e., into the surrounding gravel layer. As the reciprocating, top-down milling gradually occurs, the loose space in the gravel layer is "vibrated" and "impacted" by the "damage" and the contact between the head of the reciprocating milling component and the gravel layer. This intensifies the flow of the surrounding gravel layer and allows the slurry that was not milled to gradually flow out. Under the interception of the intercepting template, the gravel layer on the width side of the actual tank becomes more compact and stable, greatly improving safety. Furthermore, after the trench shape is inspected, multiple layers of grouting are still required during construction. The precast components on the trench side and the grouting positioning components also provide the positioning and fixing foundations for the precast grouting, making the construction process safer and more reliable. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the invention from a top view. Figure 2 This is an enlarged schematic diagram of the groove edge prefabricated component of the present invention; Figure 3 This is a schematic diagram of the arrangement of the infusion positioning component of the present invention; Figure 4 This is a schematic diagram of the positioning and connecting component of the present invention; Figure 5 This is a three-dimensional schematic diagram of the principle structure of the reciprocating milling groove assembly head of the present invention; Figure 6 This is a schematic diagram showing the arrangement of the first and second milled groove bodies of the present invention; Figure 7 This is an embodiment of the first and second milled groove bodies of the present invention from the perspective of their working state; Figure 8 This is an embodiment of the first milling body of the present invention from a top working perspective; Figure 9 This is an embodiment of the arrangement position of the working motor of the present invention; Figure 10 This is an embodiment of the rail connection method involved in the present invention; Figure 11 This is an embodiment of the milled groove teeth of the present invention.

[0019] The reference numerals in the figure are: 1. Trench body; 2. Gravel stratum; 100. Prefabricated components on trench side; 101. Interception template; 102. Forming outlet. Injection positioning component 200, columnar injection body 201, positioning connection component 202; 300mm reciprocating milling slot assembly head; Square tube body 110, inner tube channel 111, anchoring end 120, U-shaped splicing interface 130; Interception template body 101a, water sieve hole 101b, splicing connection part 101c; Radial outlet hole 201a, stable connection support arm 210, U-shaped insertion part 210a; Anchor tip 202a, first limiting body 202b, second limiting body 202c, winding post 202d, wire rope 202e, connecting hook 202f; First milled groove body 301, second milled groove body 302, reciprocating rod body 303; Rail connection limiting part 320, rail connection groove 320a, rotating fixing block 330, connecting frame 340, rotating shaft 331; Working motor 341, reciprocating arm 350, limit slider 360, strip groove 301a; The sliding insert 401, the sliding end 401a, and the support connector 402 are fixedly connected; Mounting position 403, docking connection part 404, milled groove teeth 310. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, for ease of description, in this application, "left side" is referred to as "first end", "right side" as "second end", "upper side" as "first end", and "lower side" as "second end" in the current view. The purpose of such description is to clearly express the technical solution and should not be construed as an improper limitation of the technical solution of this application.

[0021] In the construction process of trenching and wall building, the problematic steps are after trenching and before measurement. Due to the characteristics of gravel strata, even after measurement is completed, grout seepage on the trench wall and interlayer gravel flow can easily occur after construction, causing the trench to lose its excavated shape and posing potential dangers. Since drilling is the primary excavation method, these problems mostly arise after milling and edge-extending with a trenching machine. That is, after milling, the stability of the trench shape depends solely on the actual geological conditions, and unexpected situations cannot be actively eliminated or controlled. Therefore, the main technical problem in existing technologies can be identified as the potential for production safety issues arising from the uncertainty of the gravel strata's properties during large-scale trenching. Effectively controlling the trench wall surface after milling, avoiding accidents, and maintaining the trench shape can greatly ensure construction safety and improve efficiency. This technical solution addresses this problem by providing a trenching device for anti-scour walls in gravel strata, and an adaptive trenching method based on this solution to ensure the trench shape after milling. The specific content is as follows: In one specific embodiment, please refer to the appendix. Figure 1 , 2 As shown, the trenching equipment for erosion control walls in gravel strata uses a brick-gripping method with guide holes to excavate trench 1 for use. The trenching equipment for erosion control walls in gravel strata 2 includes: First, prefabricated trench side components 100 are installed. These components are positioned along the width of the trench body 1, closely adhering to the gravel stratum. Each prefabricated trench side component 100 includes an intercepting template 101 and a forming outlet 102. The reason for arranging the prefabricated trench side components 100 along the width of the trench body 1 is that after the trench is excavated, the width side is easily affected by changes in the gravel stratum, causing gravel to detach and leading to the seepage of mud from the gravel bottom layer. This seepage of mud further increases the fluidity of the gravel. The width side is prone to the above-mentioned failures due to its narrow stress area. Therefore, after excavating and milling the trench, according to this scheme, the trench side prefabricated component 100 is first arranged to stabilize the width side of the trench 1. In the arrangement method, the intercepting template 101 and the forming outlet 102 are alternately arranged on the width side of the trench 1. The forming outlet 102 is a reserved position. Therefore, the trench side prefabricated component 100 needs an additional stabilizing component. In this scheme, the injection positioning component 200 is used. The injection positioning component 200 has a columnar injection body 201 and a positioning connection component 202. The positioning connection component can form a fixed connection with the groove edge prefabrication component 100 and is used to stabilize the groove edge prefabrication component 100. Afterwards, a reciprocating milling grooving assembly head 300 can be installed, which is connected to the liftable suspension end of the lifting equipment. (The lifting suspension end here can be used with large or medium-sized lifting suspension machinery, which only needs to have a hydraulic telescopic arm. Compared with heavy construction equipment such as brick grabbing machinery and milling machinery, it can reduce the geological stress around the trench 1 after grooving, and is not affected or disturbed by the weight of the heavy machinery itself, making it safer.) Furthermore, the reciprocating milling groove assembly head 300 is connected to a guide frame 400, which can move up and down along the height of the groove edge prefabricated assembly 100, and the up and down movement is controlled by the lifting device. The reciprocating milling assembly head 300 has a reciprocating working end capable of producing up and down movements. This working end can enter the gravel stratum 2 from the forming outlet 102 to perform its reciprocating movements, so that the intercepting template 101 acts as a pressure-bearing component on the width side of the trough body 1, which is equivalent to achieving local milling of the wall surface of the trough body 1, producing a scratch-like effect. The advantages of this approach are as follows: First, the tank 1 is situated on a stable support system constructed by the prefabricated tank edge component 100 and the grouting positioning component 200 along its width. This minimizes the impact of the surrounding gravel layer on the tank 1. Furthermore, when the wall of the tank 1 is damaged by "scratching," it is equivalent to extending part of the reciprocating milling component head 300 into the wall of the tank 1, i.e., into the surrounding gravel layer. As the reciprocating, top-down milling gradually occurs, the loose space in the gravel layer is "vibrated" and "impacted" by the "damage" and the contact between the reciprocating milling component head 300 and the gravel layer. This intensifies the flow of the surrounding gravel layer and allows the slurry not being milled to gradually flow out. Under the interception of the intercepting template 101, the gravel layer on the width side of the actual tank 1 becomes more compact and stable, greatly improving safety. Furthermore, after the trench shape is inspected, multiple layers of grouting are still required during construction. The precast trench side components 100 and grouting positioning components 200 provide positioning and fixing foundations for the precast grouting, making the construction process safer and more reliable.

[0022] In one specific embodiment, please refer to the appendix. Figure 2 , 3 As shown, the prefabricated trough edge component 100 also includes: a square tube body 110 with a square cross-section and an inner tube channel 111 for grouting; an anchoring end 120 with an opening at the bottom for grouting; the anchoring end 120 is connected to the second end of the square tube body 110 and communicates with the inner tube channel 111; the anchoring end 120 is inserted into the bottom of the trough 1; U-shaped splicing interfaces 130 are symmetrically arranged on the four sides of the square tube body 110; the U-shaped splicing interfaces 130 opposite each other between adjacent square tube bodies 110 form a splicing structure for guiding and securing the connection.

[0023] In terms of ensuring a stable connection, the primary function of the U-shaped splicing interface 130 is to cooperate with the connection interception template 101. In a specific embodiment, please refer to the appendix. Figure 2 As shown, the interception template 101 includes: an interception template body 101a, on which water outlet sieve holes 101b are constructed for guiding sand and gravel slurry; splicing connection parts 101c are formed on both sides of the interception template body 101a, and the splicing connection parts 101c can be inserted into the splicing structure part. The interception template 101 includes multiple pieces, which are inserted into the splicing structure part in sequence.

[0024] In terms of ensuring a secure connection, the primary function of the U-shaped splice 130 is to connect and fix the columnar injection body 201. In a specific embodiment, please refer to the attached diagram. Figure 2 , 3 As shown, the height of the columnar injection body 201 is less than the height of the square tube body 110; the columnar injection body 201 has an insertion end at the bottom and is constructed as a hollow tube; the columnar injection body 201 has a radially arranged radial outlet hole 201a; and a stable connection support arm 210. The stable connection support arm 210 is constructed as an isosceles trapezoidal frame structure. One side of it is fixedly connected to the lower end of the columnar injection body 201, and the other end has a U-shaped insertion part 210a, which can be inserted into the U-shaped splicing interface 130 of the square tube body 110 facing the corresponding columnar injection body 201.

[0025] In one specific embodiment, please refer to the appendix. Figure 2 , 3 As shown in Figure 4, the positioning and connecting component 202, as the easiest to arrange and a stable and efficient safety component, is designed to include: an anchoring tip 202a, which is fixedly connected to the first limiting body 202b; a second limiting body 202c, which is fixedly connected to the first limiting body 202b via a surrounding column 202d; a steel wire rope 202e can be connected to the surrounding column 202d, and the steel wire rope 202e can also be fixedly connected to the radial connecting hook 202f of the columnar grouting body 201. In this way, a multi-stable support system is formed between the square tube body 110, the columnar grouting body 201, the stable connecting support arm 210, the positioning and connecting component 202, and the connecting steel wire rope 202e. This not only provides support for the wall of the tank 1, but also forms the initial grouting prefabrication position, which is convenient for subsequent construction.

[0026] In one specific embodiment, please refer to the appendix. Figure 5-8As shown, the reciprocating milling assembly head 300 includes: a first milling body 301 and a second milling body 302, respectively connected to the two ends of a reciprocating rod body 303; a preset angle is formed between the first milling body 301 and the second milling body 302, and this angle is located at the following position. Figure 5 , 6 The actual angle configured in 7 is 30 degrees, that is, the actual angle generated by the first milling body 301 or the second milling body 302 is 15 degrees; the ends of the first milling body 301 and the second milling body 302 serve as the milling working ends; the first milling body 301 is located below the second milling body 302.

[0027] In one specific embodiment, please refer to the appendix. Figure 5-10 As shown, the principle of reciprocating motion is as follows: the reciprocating milling assembly head 300 further includes: a rail connection limiting part 320, which forms a rail connection groove 320a, and the rod of the reciprocating motion rod 303 forms a rail connection with the rail connection limiting part 320; and a rotating fixing block 330, which forms a fixed connection with the rail connection limiting part 320 through a connecting frame 340. A motor support frame 340 is provided above the rotating fixed block 330; a rotating shaft 331 is provided on the rotating fixed block 330. A working motor 341 coaxial with the rotating shaft 331 is mounted on the motor bracket frame 340; the output end of the working motor 341 is connected to the rotating shaft 331 and drives the rotating shaft 331 to rotate; the other end of the rotating shaft 331 is connected to the reciprocating arm 350; the reciprocating arm 350 is rotatably connected to a limiting slider 360, and the limiting slider 360 is set in the strip groove 301a formed by the first milling body 301.

[0028] When the working motor 341 rotates, it drives the rotating shaft 331 to rotate, which in turn causes the reciprocating arm 350 to rotate. Under the movement of the limiting slider 360 in the strip groove 301a, the first milling body 301, the second milling body 302, and the reciprocating rod 303 form a reciprocating motion. This reciprocating motion causes the inclined first milling body 301 and second milling body 302 to produce a knocking effect when they contact the end face of the gravel layer. The milling teeth 310 also serve as the strength component for the knocking.

[0029] In one specific embodiment, please refer to the appendix. Figure 2 , 1As shown, the guide frame 400 includes: a sliding insert 401 forming two sliding end pieces 401a, each end piece 401a having a sliding component adapted to the shape of the U-shaped splice 130; the sliding insert 401 is arranged on the outlet 102, creating an arrangement space between the sliding end pieces 401a; the sliding insert 401 is fixedly connected by a support connector 402; the support connector 402 has a mounting position 403 for connecting to the combined bracket 321 on the side of the rail connection limiting part 320; the support connector 402 also has a docking connection part 404 for detachably connecting to the working end of the lifting device, gradually enabling the reciprocating milling groove assembly head 300 to work from top to bottom.

[0030] In one specific embodiment, please refer to the appendix. Figure 11 As shown, the ends of the first milling groove body 301 and the second milling groove body 302 can be detachably connected to a milling groove tooth 310. The milling groove tooth 310 is adapted to the arc-shaped arrangement of the ends of the first milling groove body 301 and the second milling groove body 302. The first milling groove body 301 and the second milling groove body 302 both have the same strip groove 301a. The arc-shaped ends are opened and the milling groove tooth 310 is configured with fasteners to increase friction with the gravel stratum. In fact, it "carves" a mark in the area of ​​the gravel stratum 2 of the forming outlet 102, which plays a partial "destructive" role, so that the loose gravel or gravel that has become mud is discharged, and the gravel that may have too large loose space is caused to flow and be blocked by the intercepting template 101, forming a more stable width edge of the groove body 1.

[0031] In addition, the adaptive trenching method using the above-mentioned gravel strata erosion control wall trenching equipment includes the following steps: Step 1: Excavate trench 1 by drilling and grabbing machinery, perform initial milling on trench 1 by milling machinery, arrange grouting positioning components 200, form a support system mainly composed of trench edge prefabricated components 100 and grouting positioning components 200 through the cooperation of U-shaped splicing interface 130 of square tube body 110, install interception template 101, and reserve forming outlet 102. Step 2: Assemble the reciprocating milling groove assembly head 300, arrange the guide frame 400, and mate the guide frame 400 with the U-shaped splice interface 130 at the forming outlet 102 to form a liftable guide; Step 3: After connecting the docking connection part 404 to the lifting device, control the lifting action of the reciprocating milling groove assembly head 300 through the lifting operation of the lifting device, start the working motor 341, so that the first milling groove body 301 and the second milling groove body 302 enter the working state, and finally achieve the self-forming of the groove body 1 by compacting the gravel on the width side of the groove body 1.

[0032] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A sand and gravel stratum anti-scour wall trenching device, first using a brick grabbing method to arrange a guide hole to dig out a trench body (1), characterized in that, The sand and gravel stratum (2) anti-scouring wall trenching equipment comprises: a trench edge prefabricated assembly (100) arranged at the width side of the trench body (1) and closely attached to the sand and gravel stratum, the trench edge prefabricated assembly (100) comprising an intercepting template (101) and a forming guide outlet (102); the intercepting template (101) and the forming guide outlet (102) are alternately arranged at the width side of the trench body (1); the trench edge prefabricated assembly (100) further comprises a pouring positioning assembly (200) having a columnar pouring body (201) and a positioning connecting component (202) capable of forming fixed connection with the trench edge prefabricated assembly (100) and used for stabilizing the trench edge prefabricated assembly (100); and a reciprocating trench milling assembly head (300) connected to the liftable suspension end of a lifting device, the reciprocating trench milling assembly head (300) being connected to a guide frame (400) capable of moving up and down along the height direction of the trench edge prefabricated assembly (100), and the up and down movement being controlled by the lifting device (2); the reciprocating trench milling assembly head (300) has a reciprocating working end capable of generating up and down movement, the working end being capable of partially entering the sand and gravel stratum (2) from the forming guide outlet (102) to perform reciprocating movement, so that the intercepting template (101) serves as a pressure bearing component at the width side of the trench body (1).

2. The sand gravel formation erosion protection wall trenching apparatus of claim 1, wherein, The trench edge prefabricated assembly (100) further comprises: a square tube body (110) having a square cross section and having an inner tube passage (111); an anchoring end (120) having a bottom opening, the anchoring end (120) being connected to the second end of the square tube body (110) and communicating with the inner tube passage (111); the anchoring end (120) being inserted into the trench bottom of the trench body (1); four side surfaces of the square tube body (110) being symmetrically arranged with U-shaped splicing interfaces (130); opposite U-shaped splicing interfaces (130) between adjacent square tube bodies (110) forming a splicing structure part.

3. The sand gravel formation erosion protection wall trenching apparatus of claim 2, wherein, The intercepting template (101) comprises: an intercepting template body (101a) having water screen holes (101b) formed thereon; both sides of the intercepting template body (101a) forming splicing connecting parts (101c) capable of being inserted into the splicing structure part; the intercepting template (101) comprising a plurality of pieces inserted into the splicing structure part in sequence.

4. The sand gravel formation erosion protection wall trenching apparatus of claim 2, wherein, The height of the columnar pouring body (201) is less than the height of the square tube body (110); the columnar pouring body (201) having an insertion end below and being configured as a hollow tube, the columnar pouring body (201) being radially provided with radial guide holes (201a); and ​ A stable connecting support arm frame (210) is configured as a frame structure of an isosceles trapezoid, one side of which is fixedly connected with the lower end of the columnar pouring body (201), and the other end has a U-shaped mouth insertion part (210a) capable of being inserted into the U-shaped splicing mouth (130) of the square pipe body (110) of the corresponding columnar pouring body (201).

5. The sand gravel formation erosion wall trenching apparatus of claim 3, wherein, The positioning connecting part (202) comprises: an anchoring tip (202a) fixedly connected with a first limiting body (202b); a second limiting body (202c) fixedly connected with the first limiting body (202b) through a winding column (202d); the winding column (202d) is connectable with a steel wire rope (202e), and the steel wire rope (202e) is further fixedly connectable with a radial connecting hook (202f) of the columnar pouring body (201).

6. The sand gravel formation erosion wall trenching apparatus of claim 2, wherein, The reciprocating groove milling assembly head (300) comprises: a first groove milling body (301) and a second groove milling body (302) connected at two ends of a reciprocating action rod body (303), respectively; a preset included angle is formed between the first groove milling body (301) and the second groove milling body (302); the end portions of the first groove milling body (301) and the second groove milling body (302) serve as groove milling working ends; the first groove milling body (301) is located below the second groove milling body (302).

7. The sand gravel formation erosion protection wall trenching apparatus of claim 6, wherein, The reciprocating groove milling assembly head (300) further comprises: a rail connection limiting part (320) forming a rail connection groove (320a), the rod body of the reciprocating action rod body (303) being in rail connection with the rail connection limiting part (320); a rotating fixed block (330) fixedly connected with the rail connection limiting part (320) through a connecting frame (340); a motor support frame body (340) is arranged above the rotating fixed block (330); a rotating shaft (331) is arranged on the rotating fixed block (330); a working motor (341) coaxial with the rotating shaft (331) is mounted on the motor support frame body (340); the output end of the working motor (341) is connected with the rotating shaft (331) and drives the rotating shaft (331) to rotate; the other end of the rotating shaft (331) is connected with a reciprocating arm (350); the reciprocating arm (350) is rotatably connected with a limiting sliding block (360) arranged in a strip-shaped groove (301a) formed by the first groove milling body (301).

8. The sand gravel formation erosion wall trenching apparatus of claim 7, wherein, The guide frame (400) comprises: a sliding embedding body (401) forming two sliding piece end portions (401a) having sliding parts adapted to the shape of the U-shaped splicing mouth (130); the sliding embedding body (401) is arranged on the type guide exit (102) and forms an arrangement space between the sliding piece end portions (401a); the sliding embedding body (401) is fixedly connected through a support connecting body (402). The support connecting body (402) is provided with a mounting position (403) for connecting a combined support (321) arranged on the side of the rail connection limiting part (320); The support connecting body (402) is further provided with a docking connecting part (404) for detachably connecting the working end of the lifting equipment.

9. The sand gravel formation erosion wall trenching apparatus of claim 7, wherein, The end part of the first milling groove body (301) and the second milling groove body (302) can be detachably connected with a milling groove tooth (310) which is adapted to the arc arrangement of the end part of the first milling groove body (301) and the second milling groove body (302).

10. An adaptive trenching method using the sand and gravel strata erosion protection wall trenching apparatus of claim 9, characterized in that, The method comprises the following steps: Step one, complete the drilling and grabbing operation to excavate the groove body (1) by the drilling and grabbing machine, initially mill the groove body (1) by the milling machine, arrange the pouring positioning assembly (200), form the support system mainly arranged with the groove edge prefabricated assembly (100) and the pouring positioning assembly (200) through the cooperation of the U-shaped splicing interface (130) of the square tube body (110), install the intercepting template (101), and reserve the forming guide outlet (102); Step two, assemble the reciprocating milling groove assembly head (300), arrange the guide frame (400), and cooperate the guide frame (400) with the U-shaped splicing interface (130) at the forming guide outlet (102) to form a liftable guide; Step three, after connecting the docking connecting part (404) with the lifting equipment, control the lifting action of the reciprocating milling groove assembly head (300) through the lifting operation of the lifting equipment, start the working motor (341), and make the first milling groove body (301) and the second milling groove body (302) enter the working state.

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