Microbial bacteria liquid cementing liquid synchronous grouting equipment for dam crest area of earth and rockfill dam

Abstract

The present application belongs to the technical field of geotechnical reinforcement, and particularly discloses a synchronous grouting device for microbial bacteria liquid cementing liquid in a dam crest area of an earth-rock dam. The synchronous grouting device comprises a drill bit, a grouting pipe fixedly connected to the top end of the drill bit, a center supply pipeline fixedly connected to the bottom wall of the grouting pipe, a mixing chamber for initially mixing slurry in communication with the center supply pipeline, and a grouting assembly provided on the center supply pipeline. The grouting assembly comprises an annular airtight chamber fixed to the outer wall of the center supply pipeline, a trigger ring vertically and sealingly connected in the annular airtight chamber, a plurality of push modules provided on the trigger ring and used for pushing and inserting into the soil layer to realize multi-layer grouting, and a plurality of puncture modules connected to the push modules and provided on the wall of the grouting pipe. The synchronous grouting device for microbial bacteria liquid cementing liquid in the dam crest area of the earth-rock dam can avoid the puncture needle being blocked by the soil through the openable conical protective cover, and facilitates the use of the device.

Description

Technical Field

[0001] This invention relates to the field of soil and rock reinforcement technology, specifically to a synchronous grouting device for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam. Background Technology

[0002] Earth-rock dams are one of the most widely used dam types in water conservancy projects. Their crest areas are subject to long-term rainwater erosion, wet-dry cycles, and traffic load disturbances, which can easily lead to problems such as loose soil, increased porosity, and decreased impermeability. In severe cases, this can cause crest leakage, uneven settlement, and other defects, directly threatening the safe operation of the dam. Microbial-induced calcium carbonate precipitation technology generates calcium carbonate crystals to bind soil particles through the reaction of bacterial solution and cementing solution. It has advantages such as being environmentally friendly, causing minimal construction disturbance, and having strong soil adaptability, and has been gradually applied to earth-rock dam reinforcement projects.

[0003] An existing patent (publication number: CN118880855A) discloses a microbial grouting device and construction method for reinforcing deep soft clay. It is equipped with a grouting pipe body, a telescopic nozzle, and a leak-proof mechanism composed of a spring and a flap. The grouting depth is controlled by a lifting adjustment mechanism, and the flap is used to seal the nozzle during grouting intervals to reduce the risk of blockage. This method can realize grouting reinforcement of deep soft clay layers. In the process of realizing this invention, the inventors discovered the following problems with the prior art: 1. The grouting nozzle of this device can only be adjusted along the axial direction of the grouting pipe and does not have the function of radially extending and penetrating into the surrounding soil. The grout can only diffuse outward along the borehole wall and is prone to flow and loss along the borehole wall. It is difficult to penetrate into the loose soil layer inside the dam crest area, and the effective reinforcement radius is limited, which cannot adapt to the working conditions of radial reinforcement of earth-rock dam body; 2. This device only uses a leak-proof mechanism composed of a spring and a flap to passively seal the nozzle outlet during the grouting interval. It is an intermittent sealing structure and cannot form a tight seal protection for the grouting port throughout the entire process of the equipment drilling and the nozzle penetrating the soil layer. Fine soil particles and cohesive fill in the dam crest area of ​​the earth-rock dam can easily enter the nozzle directly during the piercing process. It is difficult to completely discharge them by grouting pressure alone, which can easily cause nozzle blockage and interrupt the grouting operation.

[0004] To address the aforementioned issues, there is an urgent need for innovative design based on the existing synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​earth-rock dams. Summary of the Invention

[0005] The purpose of this invention is to provide a synchronous grouting device for microbial slurry binder in the crest area of ​​earth-rock dams, in order to solve the problems mentioned in the background art regarding the limited grouting effect and limited anti-clogging capability of existing synchronous grouting devices for microbial slurry binder in the crest area of ​​earth-rock dams.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a synchronous grouting device for microbial inoculant cementitious liquid in the crest area of ​​an earth-rock dam, comprising a drill bit, a grouting pipe fixedly connected to the top of the drill bit, a central supply pipe fixedly connected to the bottom wall of the grouting pipe, and a mixing chamber for preliminary mixing of the grout connected to the central supply pipe;

[0007] The central supply pipeline is equipped with a grouting assembly, which includes an annular airtight chamber fixed on the outer wall of the central supply pipeline. A trigger ring is vertically and slidably connected in the annular airtight chamber. The trigger ring is equipped with multiple pushing modules for pushing and inserting into the soil layer to achieve multi-layer grouting.

[0008] The pushing module is connected to multiple puncture modules located on the wall of the grouting pipe. The puncture modules are used to assist in puncturing the soil layer and prevent soil from clogging the injection port.

[0009] The grouting pipe has several receiving cavities for installing the puncture module.

[0010] Further, reinforcing rings are welded to the grouting pipe areas corresponding to several receiving cavities;

[0011] By adopting the above technical solution, the structural strength of the grouting pipe body can be improved by avoiding the reduction of structural strength caused by opening holes in the grouting pipe body.

[0012] Preferably, a hydraulic pump body is also fixedly connected to the grouting pipe, and the hydraulic pump body is connected to the annular airtight chamber to realize the motion control of the trigger ring.

[0013] Preferably, each of the pushing modules includes two annular support plates fixed in the inner wall of the grouting pipe, and a pushing plate is horizontally slidably connected between the two annular support plates. The pushing plate is provided with a telescopic transmission pipe for communicating with the central supply pipeline to realize the transmission of the mixed slurry.

[0014] Preferably, each of the push modules further includes a plurality of main limiting blocks fixedly arranged in a vertical array on the inner sidewall of the push plate. Each main limiting block is a right-angled triangular structure, and each main limiting block is provided with an oblique groove. Each oblique groove is a cross structure, and the oblique surface of each oblique groove faces the trigger ring.

[0015] Each of the main limiting blocks is slidably connected to a push limiting block via an inclined groove. The push limiting block has a right-angled triangular structure. When the push limiting block is opposite to the main limiting block, the up-and-down movement of the push limiting block drives the left-and-right movement of the main limiting block. Thus, the puncture module can be pushed by controlling the push plate. The setting of multiple puncture modules on multiple push plates can effectively increase the injection area, making it easier for the slurry to quickly penetrate the soil layer compared to a single injection port.

[0016] Preferably, each of the puncture modules includes a vertical array of connection ports fixed on the push plate. Each connection port is connected to a telescopic transmission tube. A positioning rod is threaded onto each connection port. One end of the positioning rod is slidably connected to a movable rod that matches the inner diameter of the receiving cavity. The movable rod is in sliding sealing fit with the receiving cavity. A puncture port is opened at the end of the movable rod. The movable rod and the positioning rod are connected by a spring. The movable rod and the positioning rod form a spring telescopic structure. The movable rod and the positioning rod are used to achieve delayed puncture of the puncture needle.

[0017] A puncture needle is fixedly connected to the positioning rod. The puncture needle is concentrically set with the positioning rod to facilitate stable penetration into the soil layer for grouting operation.

[0018] During the puncture process, the movable rod first contacts the soil layer and continues to penetrate deeper into the soil layer until the spring can no longer overcome the resistance of the soil layer. At this point, the movable rod stops penetrating the soil layer, and the positioning rod and the movable rod begin to contract. At the same time, the puncture needle moves relative to the movable rod until it passes through the puncture port at the end of the movable rod and is inserted into the soil layer, completing the grouting operation. By delaying the puncture of the soil layer, it is possible to avoid a large amount of soil entering the puncture needle when it is continuously inserted into the soil layer, which would prevent the injection pressure from being able to push out the soil and block the puncture needle.

[0019] Further, a sealing membrane is fixedly connected to the puncture site. The sealing membrane is made of a highly elastic polymer and is at the same horizontal height as the puncture needle.

[0020] By adopting the above technical solution, when the puncture needle passes through the sealing membrane, the puncture needle squeezes the sealing membrane to penetrate it and perform grouting. When the puncture needle is retracted, the perforation on the sealing membrane is quickly backfilled by the elastic recovery force of the material, which can reduce the probability of soil particles entering.

[0021] Furthermore, a groove-type embedded Glyd ring sealing structure is adopted between the movable rod and the receiving cavity;

[0022] By adopting the above technical solution, the sealing and anti-backflow requirements under the combined action of grouting pressure and dam head are met, and the solution also features low friction, wear resistance, and easy replacement, making it suitable for the construction conditions of shallow grouting in the dam crest area.

[0023] Preferably, each of the puncture modules further includes a sliding cavity opened in the side wall of the movable rod. The sliding cavity has several through slots. A lever arm for controlling the protective blade is hinged at each through slot. A protective blade is fixedly connected to the end of the lever arm away from the through slot. Several protective blades surround to form a conical protective cover to protect the puncture site.

[0024] When several protective blades close together, they can form a cone-shaped protective cover to protect the puncture site and prevent soil from entering. At the same time, the cone-shaped protective cover forms a cone-shaped puncture surface, which penetrates the soil layer in advance and forms a protective cavity. When the protective blades unfold, they can push a large amount of loose soil to the surrounding area, compact the local soil layer, and prevent the soil layer from collapsing and affecting the grouting.

[0025] Preferably, each puncture module further includes a control ring slidably connected to the sliding cavity. The outer surface of the control ring is provided with a plurality of control grooves for accommodating levers. Each control groove has a vertical groove on its wall and a slider is slidably fitted in each vertical groove. The sliders are respectively fixedly connected to the outer walls of the levers. By moving the control ring left and right, the levers are pushed to drive the corresponding protective blades to rotate.

[0026] Preferably, two through grooves are symmetrically formed on the sliding cavity, and an extension block is slidably connected in each of the two through grooves. The two extension blocks are fixedly connected by the same extrusion ring. The extrusion ring is coaxially arranged with the positioning rod, and the two extension blocks are fixed on the outer wall of the control ring.

[0027] One end of the control ring is connected to the inner wall of the sliding cavity by a spring. The control ring is always kept in the closed state of the control cone protective cover by the spring. In use, the positioning rod and the moving rod slide relative to each other with a delay. The positioning rod pushes the squeezing ring to drive the control ring to move. The control ring moves to the left, which drives the stress arm to rotate clockwise. The stress arm drives the corresponding protective blades to open. At this time, several protective blades open, releasing the closed state of the cone protective cover, so that the puncture needle can be inserted normally.

[0028] To achieve a stable connection between the positioning rod and the connector:

[0029] The configuration is further defined as follows: two arc-shaped grooves are provided on both the positioning rod and the connecting port, and the two arc-shaped grooves are connected to each other. A limiting arc plate is inserted into the arc-shaped groove, and the limiting arc plate is installed on the positioning rod and the connecting port respectively by two bolts.

[0030] By adopting the above technical solution, the limiting arc plate is installed in the arc groove on the positioning rod and the connection port respectively, so that when the vibration occurs, the positioning rod will loosen and rotate, but the limiting arc plate is locked by the arc groove at the connection port, and the positioning rod cannot rotate.

[0031] Preferably, two rotating shafts are rotatably installed in the mixing chamber, and stirring blades are fixedly connected to both rotating shafts. The stirring blades are used to mix the incoming slurry and prevent the slurry from clumping prematurely.

[0032] Both of the rotating shafts are fixedly connected to pulleys, and the two pulleys are connected by a transmission belt. One of the pulleys is fixedly connected to the motor main shaft, and the motor is fixed in the inner wall of the mixing chamber. Through the design of the mixing chamber, the slurry and microbial liquid can be fully mixed and the two can be prevented from binding in advance.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. In this invention, the conical protective cover formed by several protective blades can protect the puncture needle during the puncture process, preventing excessive mud from entering the puncture needle and clogging it. In addition, the conical structure of the protective cover can assist puncture, reduce puncture resistance, and facilitate the use of the device.

[0035] 2. In this invention, a ring array around the central supply pipeline is provided with several pushing modules and piercing modules, thereby achieving multi-directional grouting through several piercing needles at different depths and orientations, so that the injected grout can penetrate deep into the loose soil layer on the top of the earth-rock dam, effectively increasing the fixing radius.

[0036] 3. In this invention, a mixing chamber is provided at the central supply pipeline. By forcibly mixing the transmitted slurry, the premature formation of cemented lumps in the central supply pipeline is avoided. Furthermore, the mixing chamber can mix the input bacterial solution and slurry together, thereby improving the curing effect after injection. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall external structure of the present invention from a front view.

[0038] Figure 2 This is a schematic diagram of the overall front view sectional structure of the present invention. Figure 1 ;

[0039] Figure 3 This is a schematic diagram of the overall front view sectional structure of the present invention. Figure 2 ;

[0040] Figure 4 This is a partial cross-sectional view of the grouting assembly in this invention;

[0041] Figure 5 This is a schematic diagram of the connection structure of the push plate, main limiting block and positioning rod in this invention;

[0042] Figure 6 This is an exploded view of the main limiting block and push limiting block structures in this invention;

[0043] Figure 7 This is a cross-sectional view of the puncture module in this invention;

[0044] Figure 8This is a cross-sectional view of the positioning rod and the movable rod in this invention;

[0045] Figure 9 This is a schematic diagram of the three-dimensional structure of the conical protective cover in this invention.

[0046] In the diagram: 1. Drill bit; 2. Grouting pipe; 3. Central supply pipe; 4. Mixing chamber; 5. Grouting assembly; 51. Annular airtight chamber; 52. Trigger ring; 53. Pushing module; 5301. Annular support plate; 5302. Pushing plate; 5303. Telescopic transmission pipe; 5304. Main limiting block; 5305. Inclined chute; 5306. Pushing limiting block; 54. Puncture module; 5401. Connection port; 5402. Positioning rod; 5403. Movable rod; 5404. Puncture port; 5 405. Puncture needle; 5406. Sliding cavity; 5407. Through groove; 5408. Lever arm; 5409. Protective blade; 5410. Conical protective cover; 5411. Control ring; 5412. Control groove; 5413. Vertical groove; 5414. Slider; 5415. Through groove; 5416. Extension block; 5417. Extrusion ring; 5418. Arc groove; 5419. Limiting arc plate; 55. Receiving cavity; 6. Rotating shaft; 7. Stirring blade; 8. Pulley; 9. Drive belt. Detailed Implementation

[0047] 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.

[0048] See Figure 1-9 The present invention provides a technical solution: a synchronous grouting device for microbial inoculant cementitious liquid in the crest area of ​​an earth-rock dam, including a drill bit 1, a grouting pipe 2 fixedly connected to the top of the drill bit 1, a central supply pipe 3 fixedly connected to the bottom wall of the grouting pipe 2, and a mixing chamber 4 for preliminary mixing of grout connected to the central supply pipe 3.

[0049] A grouting assembly 5 is installed on the central supply pipeline 3. The grouting assembly 5 includes an annular airtight chamber 51 fixed on the outer wall of the central supply pipeline 3. A trigger ring 52 is vertically slidably sealed in the annular airtight chamber 51. Multiple push modules 53 for pushing and inserting into the soil layer to achieve multi-layer grouting are installed on the trigger ring 52.

[0050] The push module 53 is connected to multiple puncture modules 54 located on the wall of the grouting pipe 2. The puncture modules 54 are used to assist in puncturing the soil layer and prevent soil from clogging the injection port.

[0051] The grouting pipe 2 has several receiving cavities 55 for installing the puncture module 54;

[0052] A hydraulic pump body is also fixedly connected to the grouting pipe 2, and the hydraulic pump body is connected to the annular airtight chamber 51 to realize the motion control of the trigger ring 52.

[0053] Preferably, the rated working pressure range of the hydraulic pump body is set to 1~2MPa. This pressure range can output sufficient thrust to overcome the internal sealing friction resistance of the annular airtight chamber 51 and stably drive the trigger ring 52 to complete the preset vertical stroke.

[0054] By controlling the output power of the hydraulic pump body, the thrust of the trigger ring 52 is changed, thereby increasing or decreasing the thrust of the push plate 5302 in several push modules 53, so as to realize different puncture kinetic energy of the puncture module 54 to adapt to the needs of different soil layers.

[0055] In this embodiment, as Figure 2 , Figure 3 and Figure 4 As shown, each push module 53 includes two annular support plates 5301 fixed in the inner wall of the grouting pipe 2, and a push plate 5302 is horizontally slidably connected between the two annular support plates 5301. The push plate 5302 is provided with a telescopic transmission pipe 5303 for communicating with the central supply pipe 3 to realize the transmission of the mixed slurry.

[0056] Preferably, the horizontal output thrust of a single pusher plate 5302 is in the range of 210N~400N, and the effective horizontal push stroke is in the range of 50~70mm. This parameter range can be adapted to the piercing and pushing requirements of dam top soil with different densities.

[0057] In this embodiment, as Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, each push module 53 also includes several main limiting blocks 5304 vertically arrayed and fixedly disposed on the inner side wall of the push plate 5302. Each main limiting block 5304 is a right-angled triangular structure. Each main limiting block 5304 is provided with an oblique groove 5305. Each oblique groove 5305 is a cross structure. The oblique surface of each oblique groove 5305 faces the trigger ring 52.

[0058] Each main limiting block 5304 is slidably connected to a push limiting block 5306 via an inclined slide groove 5305. The push limiting block 5306 has a right-angled triangular structure. When the push limiting block 5306 is opposite to the main limiting block 5304, the up-and-down movement of the push limiting block 5306 drives the main limiting block 5304 to move left and right. Thus, the puncture module 54 can be pushed by controlling the push plate 5302. The setting of several puncture modules 54 on several push plates 5302 can effectively increase the injection area, making it easier for the grout to quickly penetrate the soil layer compared to a single injection port.

[0059] Preferably, in this embodiment, when the rated working pressure range of the hydraulic pump body is set to 1~2MPa and the horizontal output thrust range of a single pusher plate 5302 is 250N~350N, the angle between the inclined slide 5305 and the horizontal direction is about 68°~72°, and the angle between the inclined slide 5305 and the vertical direction is about 18°~22°, so that the pusher limiting block 5306 pushes the main limiting block 5304 through the inclined slide 5305 to form sufficient thrust.

[0060] In this embodiment, as Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, each puncture module 54 includes a vertical array of connection ports 5401 fixed on the push plate 5302. Each connection port 5401 is connected to the telescopic transmission tube 5303. A positioning rod 5402 is threadedly installed on each connection port 5401. One end of the positioning rod 5402 is slidably connected to a movable rod 5403 that matches the inner diameter of the receiving cavity 55. The movable rod 5403 and the receiving cavity 55 are slidably sealed together. A puncture port 5404 is opened at the end of the movable rod 5403. The movable rod 5403 and the positioning rod 5402 are connected by a spring. The movable rod 5403 and the positioning rod 5402 form a spring telescopic structure. The movable rod 5403 and the positioning rod 5402 are used to achieve delayed puncture of the puncture needle 5405.

[0061] Preferably, the spring elastic coefficient is in the range of 15~22N / mm, and the critical resistance range of the soil layer for triggering delayed penetration is 90~140N, which can be adapted to the penetration conditions of soil with different densities on the top of earth-rock dams.

[0062] In this embodiment, as Figure 2 , Figure 3 , Figure 5 and Figure 7As shown, a puncture needle 5405 is fixedly connected to the positioning rod 5402. The puncture needle 5405 is concentrically arranged with the positioning rod 5402 to facilitate stable penetration into the soil layer for grouting operations. The puncture needle 5405 is connected to the telescopic transmission pipe 5303. During the puncture process, the movable rod 5403 first contacts the soil layer and continues to penetrate deeper into the soil layer until the spring can no longer overcome the resistance of the soil layer. At this point, the movable rod 5403 stops penetrating the soil layer, and the positioning rod 5402 and the movable rod 5403... The space between them begins to contract, and at the same time, the puncture needle 5405 will move relative to the movable rod 5403 until the puncture needle 5405 passes through the puncture port 5404 at the end of the movable rod 5403 and is inserted into the soil layer. The relative extension of the puncture needle 5405 is 16mm, completing the grouting operation. By delaying the puncture of the soil layer, it can be avoided that when the puncture needle 5405 is continuously inserted into the soil layer, a large amount of soil will enter the interior of the puncture needle 5405, which would prevent the injection pressure from being able to push out the soil and block the puncture needle 5405.

[0063] Preferably, the extension length of the puncture needle 5405 relative to the movable rod 5403 is set to 12~20mm. This length can ensure that the needle completely passes through the puncture port 5404 without excessive scraping and blockage with the soil layer.

[0064] In this embodiment, the relative extension of the puncture needle 5405 is approximately 16 mm;

[0065] Preferably, under the grouting conditions, the grouting flow rate of a single puncture needle is controlled within the range of 1.0~1.5L / min, and the effective radial diffusion radius of the grout is 220~260mm, which can meet the reinforcement requirements of the shallow soil on the dam crest.

[0066] In this embodiment, as Figure 2 , Figure 7 , Figure 8 and Figure 9 As shown, each puncture module 54 also includes a sliding cavity 5406 opened in the side wall of the movable rod 5403. The sliding cavity 5406 is provided with a number of through slots 5407. A lever arm 5408 for controlling the protective blade 5409 is hinged at each through slot 5407. The protective blade 5409 is fixedly connected to one end of the lever arm 5408 away from the through slot 5407. The number of protective blades 5409 together form a conical protective cover 5410 to protect the puncture port 5404.

[0067] When several protective blades 5409 are closed, they can form a conical protective cover 5410 to protect the puncture opening 5404 and prevent soil from entering. At the same time, the conical protective cover 5410 forms a conical puncture surface, which penetrates the soil layer in advance and forms a protective cavity. When the protective blades 5409 are unfolded, they can push a large amount of loose soil to the surrounding area, compact the local soil layer, and prevent the soil layer from collapsing and affecting the grouting.

[0068] In this embodiment, as Figure 2 , Figure 7 , Figure 8 and Figure 9 As shown, each puncture module 54 also includes a control ring 5411 slidably connected to the sliding cavity 5406. The outer surface of the control ring 5411 is provided with a plurality of control slots 5412 for accommodating lever arms 5408. Each control slot 5412 has a vertical slot 5413 on its slot wall. Each vertical slot 5413 is slidably fitted with a slider 5414. The plurality of sliders 5414 are respectively fixedly connected to the outer wall of the plurality of lever arms 5408. By moving the control ring 5411 left and right, the lever arms 5408 are pushed to drive the corresponding protective blades 5409 to rotate.

[0069] Preferably, the axial movement range required for the control ring 5411 to fully open the conical protective cover 5410 is 10~15mm, and this range can be matched with the opening and closing transmission sequence of different specifications of protective blades 5409.

[0070] In this embodiment, as Figure 7 , Figure 8 and Figure 9 As shown, two through grooves 5415 are symmetrically opened on the sliding cavity 5406. An extension block 5416 is slidably connected in each of the two through grooves 5415. The two extension blocks 5416 are fixedly connected by the same compression ring 5417. The compression ring 5417 is coaxially arranged with the positioning rod 5402. The two extension blocks 5416 are fixed on the outer wall of the control ring 5411.

[0071] One end of the control ring 5411 is connected to the inner wall of the sliding cavity 5406 by a spring. The control ring 5411 is kept in a closed state by the spring. In use, the positioning rod 5402 and the movable rod 5403 slide relative to each other with a delay. The positioning rod 5402 pushes the compression ring 5417 to move the control ring 5411. The control ring 5411 moves to the left, which drives the stress arm 5408 to rotate clockwise. The stress arm 5408 drives the corresponding protective leaf 5409 to open. At this time, several protective leaves 5409 open, releasing the closed state of the conical protective cover 5410, allowing the puncture needle 5405 to pass through normally.

[0072] In this embodiment, as Figure 7 and Figure 8As shown, two arc-shaped grooves 5418 are provided on both the positioning rod 5402 and the connecting port 5401, and the two arc-shaped grooves 5418 are connected. A limiting arc plate 5419 is inserted into the arc-shaped groove 5418, and the limiting arc plate 5419 is installed on the positioning rod 5402 and the connecting port 5401 respectively by two bolts. By installing the limiting arc plate 5419 in the arc-shaped groove 5418 on the positioning rod 5402 and the connecting port 5401 respectively, the limiting arc plate 5419 is limited by the arc-shaped groove 5418 at the connecting port 5401, so that the positioning rod 5402 cannot rotate circumferentially, which can prevent the positioning rod 5402 from loosening and rotating during vibration.

[0073] In this embodiment, as Figure 2 and Figure 3 As shown, two rotating shafts 6 are rotatably installed in the mixing chamber 4, and stirring blades 7 are fixedly connected to both rotating shafts 6. The stirring blades 7 are used to mix the incoming slurry and prevent the slurry from clumping in advance. Pulleys 8 are fixedly connected to both rotating shafts 6, and the two pulleys 8 are connected to each other by a transmission belt 9. One of the pulleys 8 is fixedly connected to the motor main shaft, and the motor is fixed in the inner wall of the mixing chamber 4.

[0074] Since the mixing chamber 4 is located between the central supply pipeline 3 and the mixing chamber 4, the bacterial solution and the cementing solution can be transported to the mixing chamber 4 separately through independent pipelines for mixing. The independent transmission during the transmission process can avoid the mixed slurry from reacting and scaling in the long-distance transmission pipeline. The mixing chamber 4 is close to the puncture modules 54 of each layer. The mixed slurry only needs to be diverted downwards for a short distance and transmitted to each grouting point through the telescopic transmission pipe 5303. The mixed slurry has a short retention path and short residence time, which can greatly reduce the risk of pipeline scaling.

[0075] Preferably, the working speed range of the stirring blade 7 is set to 100~150 r / min. This speed range can ensure that the bacterial solution and the cementing solution are fully mixed and suppress the premature cementing and clumping phenomenon in the pipeline.

[0076] The method of use and advantages of this invention: The working process of the synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​the earth-rock dam is as follows:

[0077] like Figures 1 to 9 As shown, the grouting pipe 2 follows the drill bit 1 into the soil layer until the predetermined depth is reached. The hydraulic pump body is then activated, reducing the hydraulic pressure in the annular airtight chamber 51. The trigger ring 52 is pushed into the annular airtight chamber 51 by external atmospheric pressure. The trigger ring 52 drives several pushing and limiting blocks 5306 on it to move upwards synchronously. At this time, as... Figure 6As shown, since the push limiting block 5306 and the main limiting block 5304 are set opposite each other, when the push limiting block 5306 moves upward, it will push the main limiting block 5304 to the left, so that several main limiting blocks 5304 simultaneously push several push plates 5302 to make radially disjointed movements on the annular support plate 5301, in preparation for penetrating the soil layer.

[0078] Next, several push plates 5302 move outwards, and the movable rods 5403 on each push plate 5302 pass through the receiving cavity 55. At this time, the conical protective cover 5410 formed by the closing of several protective blades 5409 will first contact the soil layer. Through the conical structure, it can quickly break through the soil layer and penetrate into it. At this time, the elastic restoring force of the spring between the movable rod 5403 and the positioning rod 5402 can overcome the resistance of the soil layer. Until the soil layer resistance increases, the movable rod 5403 is passively pushed by the soil layer. The movable rod 5403 and the positioning rod 5402 begin to contract and compress the spring. At this time, the positioning rod 5402 drives the internal piercing needle 5405 to gradually extend into the interior of the movable rod 5403 until the end of the positioning rod 5402 contacts the compression ring 5417. The compression ring 5417 pushes the control ring 5411 to the left, and the control ring 5411 pushes the force arm 5408 to the left. Figure 8 and Figure 9 As shown, one end of the lever arm 5408 is hinged to the inner wall of the sliding cavity 5406, so that when the lever arm 5408 is subjected to force, the lever arm 5408 slides downward in the vertical groove 5413 through the slider 5414, while the lever arm 5408 rotates clockwise. The lever arm 5408 drives the protective blade 5409 on the corresponding side to rotate upward. Several protective blades 5409 simultaneously expand and rotate outward, and several protective blades 5409 compact the soil layer around the puncture space. At this time, the positioning rod 5402 moves to the maximum stroke, and the puncture needle 5405 on it will be inserted into the soil layer from the puncture port 5404.

[0079] At this time, the slurry and microbial inoculum are transferred to the mixing chamber 4 by an external pump. The motor drives one of the pulleys 8, which in turn drives the other pulley 8 to rotate via the transmission belt 9. The rotating shaft 6 on the two pulleys 8 drives the stirring blade 7 to rotate. After the slurry is mixed, it enters the central supply pipe 3 and is transported along the telescopic transmission pipes 5303 on several push plates 5302 to supply each corresponding puncture needle 5405 to complete the grouting operation. By setting multiple puncture needles 5405, the penetration efficiency of the slurry can be greatly improved, thus improving the grouting repair efficiency.

Claims

1. A synchronous grouting device for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam, comprising a drill bit (1), a grouting pipe (2) connected to the drill bit (1), a central supply pipe (3) located within the grouting pipe (2), and a mixing chamber (4) connected to the central supply pipe (3), characterized in that: The central supply pipe (3) is provided with a grouting assembly (5), which includes an annular airtight chamber (51), a trigger ring (52) slidably disposed in the annular airtight chamber (51), a number of push modules (53) connected to the trigger ring (52), and a number of puncture modules (54) connected to each push module (53). The grouting pipe (2) is provided with a receiving cavity (55) for installing the puncture module (54).

2. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 1, characterized in that: A hydraulic pump body is also fixedly connected to the grouting pipe (2). The hydraulic pump body is connected to the annular airtight chamber (51) to control the movement of the trigger ring (52).

3. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 1, characterized in that: Each of the push modules (53) includes two annular support plates (5301) fixed on the inner wall of the grouting pipe (2), and a push plate (5302) is horizontally slidably connected between the two annular support plates (5301). The push plate (5302) is provided with a telescopic transmission pipe (5303) for communicating with the central supply pipe (3). Several main limiting blocks (5304) are vertically arrayed on the inner wall of the push plate (5302). Each main limiting block (5304) has an inclined groove (5305). The inclined surface of each inclined groove (5305) faces the trigger ring (52). Each main limiting block (5304) is slidably connected to a push limiting block (5306) through the inclined groove (5305). The push limiting block (5306) is used to push the main limiting block (5304) to move left and right by moving up and down, thereby controlling the movement of the push plate (5302).

4. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 3, characterized in that: Each of the puncture modules (54) includes a vertical array of connection ports (5401) fixed on the push plate (5302). Each connection port (5401) is connected to a telescopic transmission tube (5303). A positioning rod (5402) is threaded onto each connection port (5401). One end of the positioning rod (5402) is slidably connected to a movable rod (5403) that matches the inner diameter of the receiving cavity (55). A puncture needle (5405) is fixedly connected in the positioning rod (5402). The end of the movable rod (5403) is provided with a puncture port (5404). The movable rod (5403) and the positioning rod (5402) are connected by a spring to form a spring telescopic structure, so as to realize the delayed puncture of the puncture needle (5405).

5. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 4, characterized in that: Each of the puncture modules (54) further includes a sliding cavity (5406) ​​opened in the side wall of the movable rod (5403). The sliding cavity (5406) ​​is provided with a plurality of through slots (5407). A lever arm (5408) is hinged at each through slot (5407). A protective blade (5409) is fixedly connected to one end of the lever arm (5408) away from the through slot (5407). A plurality of protective blades (5409) surround to form a conical protective cover (5410) for protecting the puncture site (5404).

6. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 5, characterized in that: Each of the puncture modules (54) further includes a control ring (5411) slidably connected to the sliding cavity (5406). The outer surface of the control ring (5411) is provided with a plurality of control grooves (5412) for accommodating lever arms (5408). Each control groove (5412) has a vertical groove (5413) on its groove wall, and a slider (5414) is slidably fitted in each vertical groove (5413). Several sliders (5414) are fixedly connected to the outer walls of several levers (5408) respectively, so as to drive the levers (5408) to rotate the protective blades (5409) by moving the control ring (5411).

7. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 6, characterized in that: Two through grooves (5415) are symmetrically opened on the sliding cavity (5406). An extension block (5416) is slidably arranged in each of the two through grooves (5415). The extension block (5416) is fixed on the outer wall of the control ring (5411). The two extension blocks (5416) are fixedly connected by the same extrusion ring (5417) so that the extrusion ring (5417) can contact the positioning rod (5402) and drive the control ring (5411) to move.

8. The synchronous grouting equipment for microbial inoculant cementing solution in the crest area of ​​an earth-rock dam according to claim 1, characterized in that: The mixing chamber (4) has two rotating shafts (6) installed in rotation, and stirring blades (7) are fixedly connected to both rotating shafts (6) to mix the incoming slurry and prevent the mixed slurry from agglomerating and clumping in advance; Two rotating shafts (6) are fixedly connected to pulleys (8), and the two pulleys (8) are connected to each other by a transmission belt (9). One of the pulleys (8) is fixedly connected to the motor main shaft to drive the stirring blade (7) to rotate.

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