A multi-high pressure adaptive micro-disturbance jet grouting drilling tool

Abstract

The present invention discloses a multiple high-pressure adaptive micro-disturbance rotary jet drilling tool, which belongs to the technical field of rotary jet grouting. The multiple high-pressure adaptive micro-disturbance rotary jet drilling tool of the present invention includes a rotary jet diverter, a rotary jet drill rod, a vacuum suction device and a drill bit. It creatively adopts a multi-channel high-pressure rotary jet diverter, and cooperates with the rotary jet drill rod to realize high-pressure jetting at multiple levels, which increases the construction efficiency by many times and improves the pile quality; each level injection point is a high-pressure gas and high-pressure polymer dual-channel nozzle, which protects the high-pressure strength of the high-pressure polymer jet and cuts the soil more effectively. In addition, the vacuum suction device is creatively adopted, and no manual intervention is required during the entire rotary jetting process, which avoids quality problems caused by manual operation errors, and the construction operation is simpler and more convenient; at the same time, the wireless pressure sensor at the bottom can transmit the pressure in the underground hole to the mechanical equipment operating platform in real time, and can dynamically adjust the pressure in the hole; it no longer relies on imported MJS equipment, which greatly reduces the construction cost of micro-disturbance rotary jet grouting.

Description

Technical Field

[0001] The invention relates to a pile foundation drilling tool, and more specifically to a multiple high-pressure self-adaptive micro-disturbance jetting drilling tool. Background Art

[0002] In the field of civil engineering, high-pressure jet grouting piles and triaxial mixing piles are important foundation treatment technologies and are widely used in various engineering projects. However, these technologies have some problems in actual application, such as low construction efficiency and easy soil squeezing effect.

[0003] High-pressure jet grouting technology forms a stable reinforcement body by spraying cement slurry and other reinforcement materials into the soil layer at high pressure. However, there is a key problem with traditional jet grouting technology, namely: even if triple high-pressure jet grouting is used, since the upper part is a high-pressure water and gas mixing nozzle and the lower part is filled with low-pressure cement slurry, this design and structure makes the lower cement slurry only have a filling function and cannot play the role of high-pressure jet cutting the soil. There is only one high-pressure nozzle that actually plays a spraying role, which results in only a single nozzle working at the same time, thereby greatly reducing the construction efficiency. Since there is only one nozzle for spraying, not only the construction speed is limited, but the reinforcement effect may also be affected. Therefore, improving the construction efficiency of jet grouting has become an issue that needs to be solved urgently.

[0004] In addition, during the construction process of high-pressure jet grouting piles and three-axis mixing piles, due to the physical properties of the soil and the influence of the construction method, the pile body squeezes and disturbs the surrounding soil, which will produce a soil squeezing effect. This effect will not only disturb the surrounding environment, but may also cause problems such as ground uplift and uneven settlement, which will have an adverse impact on the surrounding environment and buildings. Especially in urban construction, due to the dense buildings and complex underground pipelines, the harm of the soil squeezing effect is more significant. Therefore, reducing the soil squeezing effect has become an important consideration in the application of these two technologies.

[0005] In order to solve the problem of soil squeezing effect, micro-disturbance mixing pile technology has received extensive attention and research. Micro-disturbance mixing pile technology reduces the disturbance and squeezing of the surrounding soil by optimizing the mixing process and parameters, such as optimizing the shape of the mixing head, the rotation speed and the grouting method, thereby reducing the soil squeezing effect. At present, this technology has been applied in some projects and has achieved certain results. However, this technology still has certain challenges in practical application, such as the need for further optimization of construction cost, construction speed, mixing effect, etc., and there are generally problems such as high construction cost and long construction period. In particular, the ground stress cannot be adaptively adjusted, and the surrounding soil may still be disturbed and squeezed due to operation and other reasons. With the continuous development of urban construction, the requirements for foundation treatment technology are also getting higher and higher. Under the premise of protecting the surrounding environment and ensuring the safety of buildings, reducing the disturbance and squeezing of the soil has become an important development direction of mixing pile technology. Therefore, researching and developing micro-disturbance mixing pile technology has important practical significance and application prospects.

[0006] MJS (Multi-Jet Small Displacement) technology is a new type of foundation treatment technology that reduces the internal stress of the ground by sucking cement slurry in the hole, thereby achieving the effect of micro-disturbance. This technology can effectively reduce the impact of the soil squeezing effect and protect the surrounding environment and building safety. However, MJS technology also has some limitations, such as high equipment cost and only reciprocating spraying but not continuous rotation, which limits its application in mixing piles and high-pressure rotary jet piles that require continuous rotation.

[0007] Although MJS technology has significant advantages in reducing ground stress and micro-disturbance, its high cost and the limitation of not being able to rotate continuously restrict its wide application and cannot meet the construction needs of mixing piles and high-pressure rotary jet piles that require continuous rotation. In order to overcome these limitations, it is necessary to further study and improve MJS technology to reduce its cost and improve construction efficiency. At the same time, it is also necessary to explore new technologies and methods to meet the needs of different projects for mixing piles and rotary jet piles.

[0008] In addition to the process methods and construction equipment, the design of the jet grouting drill is also crucial in the construction process of micro-disturbance jet grouting piles, which directly determines the construction efficiency and soil squeezing effect of the jet grouting piles and mixing piles. Summary of the invention

[0009] 1. Technical problem to be solved by the invention

[0010] The purpose of the present invention is to overcome the above-mentioned shortcomings of the existing micro-disturbance rotary jet piles, and to provide a multiple high-pressure adaptive micro-disturbance rotary jet drilling tool. The technical scheme of the present invention is adopted, and a multi-channel high-pressure rotary jet diverter is creatively adopted, so that the lower part of the rotary jet drill rod utilizes multiple dual-channel rotary jet nozzles to realize multi-level points for high-pressure jetting. Each level of injection point is a dual-channel nozzle of high-pressure gas and high-pressure polymer. The high-pressure polymer is sprayed from the center, and the high-pressure gas is sprayed around the high-pressure polymer jet to protect the high-pressure strength of the high-pressure polymer jet, thereby ensuring that the high-pressure jet can cut the soil more effectively. At the same time, since the high-pressure jet can be used for cutting and stirring the soil at multiple levels, the construction efficiency can be doubled with each additional level, thereby achieving a multiple increase in construction efficiency and a better pile quality. In addition, a vacuum back-suction device is creatively used to solve the problem that the existing technology cannot adaptively adjust the internal stress of the ground. The multi-layer back-suction holes are closed by a sealing plunger arranged at the front end of the vacuum back-suction device. The sealing plunger can move as the pressure increases, thereby opening the annular multi-layer back-suction holes. The polymer mixture at the bottom of the hole is transported to the ground recovery device along the multi-layer back-suction holes under the suction of the vacuum pump, automatically achieving the effect of increasing the high-pressure reflux channel. Therefore, no manual intervention is required in the entire rotary spraying process, automation is achieved, quality problems caused by manual operation errors are avoided, and construction operations are simpler and more convenient. At the same time, the wireless pressure sensor at the bottom can transmit the pressure in the underground hole to the mechanical equipment operating platform in real time, and the pressure in the hole can be dynamically adjusted. It no longer relies on imported MJS equipment, which greatly reduces the construction cost of micro-disturbance rotary spraying grouting and can be widely used.

[0011] 2. Technical solution

[0012] In order to achieve the above object, the technical solution provided by the present invention is:

[0013] The invention discloses a multi-high pressure adaptive micro-disturbance jet grouting drilling tool, comprising:

[0014] A rotary jet splitter, the rotary jet splitter comprising a splitter housing and a rotating shaft body capable of freely rotating in the splitter housing, the splitter housing having at least a vacuum back-suction interface, a high-pressure polymer interface and a compressed air interface, the rotating shaft body having channels that are independent of each other and communicate with the corresponding vacuum back-suction interface, the high-pressure polymer interface and the compressed air interface; and,

[0015] A rotary jet drill rod, the upper end of which is directly or indirectly connected to the rotary shaft of the rotary jet diverter through an extended drill rod, the rotary jet drill rod has a vacuum back-suction channel connected to the above-mentioned vacuum back-suction interface, a high-pressure polymer channel connected to the above-mentioned high-pressure polymer interface, and a high-pressure gas channel connected to the above-mentioned compressed air interface, at least two groups of dual-channel rotary jet nozzles are axially spaced on the side wall of the rotary jet drill rod, each group of the dual-channel rotary jet nozzles includes a high-pressure polymer nozzle and a high-pressure gas nozzle located at the periphery of the high-pressure polymer nozzle, the high-pressure polymer nozzle is connected to the corresponding high-pressure polymer channel, and the high-pressure gas nozzle is connected to the corresponding high-pressure gas channel; and,

[0016] A vacuum back-suction device, the vacuum back-suction device comprises a rod body fixedly mounted at the lower end of a rotary jet drill rod, a mounting cavity is arranged in the rod body, a wireless pressure sensor, a high-strength spring and a sealing plunger are sequentially mounted in the mounting cavity from top to bottom, one end of the high-strength spring acts on the wireless pressure sensor, and the other end acts on the sealing plunger, a multi-layer back-suction hole matched with the sealing plunger is arranged on the side wall of the mounting cavity, the multi-layer back-suction hole is connected with the vacuum back-suction channel of the rotary jet drill rod through the back-suction flow channel on the rod body, the lower end of the rod body has a back-suction port opposite to the sealing plunger, the sealing plunger can move according to the change of the pressure of the polymer mixture in the ground to control the opening and closing and the opening and closing amplitude of the multi-layer back-suction hole; and,

[0017] A drill bit is fixedly mounted on the lower end of a rod body of the vacuum suction device.

[0018] Furthermore, the upper end of the rotating shaft body has a stepped rotating joint, and a plurality of channels are correspondingly arranged on the stepped surface of the stepped rotating joint. The diverter housing has a stepped cavity adapted to the above-mentioned stepped rotating joint, and the step surface of the stepped cavity is provided with a diverter groove corresponding to the corresponding channel, and the vacuum back-suction interface, the high-pressure polymer interface and the compressed air interface are respectively connected to the corresponding diverter grooves; the step side walls of the stepped rotating joint are also respectively provided with sealing steel rings that seal with the inner side walls of the stepped cavity.

[0019] Furthermore, the lower end of the rotating shaft body has a diverter joint for connecting an extended drill rod or a rotary jet drill rod, and the two ends of the extended drill rod are respectively provided with an extended drill rod upper joint and an extended drill rod lower joint, and the upper end of the rotary jet drill rod is provided with a rotary jet drill rod upper joint. The diverter joint is complementary in shape to the extended drill rod upper joint and the rotary jet drill rod upper joint, and the extended drill rod lower joint is complementary in shape to the rotary jet drill rod upper joint, and the diverter joint, the extended drill rod upper joint, the extended drill rod lower joint and the rotary jet drill rod upper joint all adopt a stepped butt joint structure.

[0020] Furthermore, the vacuum back-suction channel is located at the center of the rotary jet drill rod, the high-pressure gas channel is located at the outermost side of the rotary jet drill rod, and the high-pressure polymer channel is located between the vacuum back-suction channel and the high-pressure gas channel.

[0021] Furthermore, the lower end of the rotary jet drill pipe has a junction block for sealing the corresponding high-pressure polymer channels and high-pressure gas channels, and the junction block is provided with a junction ring groove connected to the corresponding channel, and the high-pressure polymer nozzle is respectively connected to the junction ring groove corresponding to the corresponding high-pressure polymer channel, and the high-pressure gas nozzle is respectively connected to the high-pressure gas channel or the junction ring groove corresponding to the high-pressure gas channel.

[0022] Furthermore, the rotating shaft body, the extended drill rod and the rotary jet drill rod are all assembled by sleeve connection of steel pipes, and the corresponding holes on the rotating shaft body, the extended drill rod and the rotary jet drill rod are all arranged on the pipe wall of the corresponding steel pipe.

[0023] Furthermore, in the vacuum suction device, a spiral adjuster is threadedly connected in the suction port, the spiral adjuster has a central through hole, the upper end of the spiral adjuster abuts against the lower end surface of the sealing plunger, and the spiral adjuster also has a screwing structure for easy adjustment operation.

[0024] Furthermore, the drill bit is a multi-wing alloy drill bit or a down-the-hole hammer drill bit.

[0025] Furthermore, a plurality of stirring blades are selectively provided on the outer wall of the jet jet drill rod.

[0026] Furthermore, the multiple high-pressure adaptive micro-disturbance rotary jet drilling tool is a single-axis rotary jet drilling tool or a multi-axis rotary jet drilling tool; when a multi-axis rotary jet drilling tool structure is adopted, each single-axis rotary jet drilling tool is connected by a multi-axis drill rod support frame.

[0027] 3. Beneficial effects

[0028] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0029] (1) A multiple high-pressure adaptive micro-disturbance jetting drill tool of the present invention comprises a jetting diverter, a jetting drill rod, a vacuum suction device and a drill bit, wherein the jetting diverter comprises a diverter housing and a rotating shaft body that can rotate freely in the diverter housing, the diverter housing has at least a vacuum suction interface, a high-pressure polymer interface and a compressed air interface, and the rotating shaft body has channels that are independent of each other and connected to the corresponding vacuum suction interface, high-pressure polymer interface and compressed air interface; at least two groups of dual-channel jetting nozzles are axially spaced apart on the side wall of the jetting drill rod, each group of dual-channel jetting nozzles comprises a high-pressure polymer nozzle and a high-pressure polymer nozzle located at the periphery of the high-pressure polymer nozzle high-pressure gas nozzle; the creative use of multi-channel high-pressure rotary jet diverter enables the lower part of the rotary jet drill pipe to use multiple dual-channel rotary jet nozzles to achieve high-pressure jetting at multiple levels. Each level of injection point is a dual-channel nozzle of high-pressure gas and high-pressure polymer. The high-pressure polymer is ejected from the center, and the high-pressure gas is ejected together around the high-pressure polymer jet, which protects the high-pressure strength of the high-pressure polymer jet, thereby ensuring that the high-pressure jet can cut the soil more effectively. At the same time, since high-pressure jets can be used for cutting and stirring the soil at multiple levels, the construction efficiency can be doubled with each additional level, thereby achieving a multiple increase in construction efficiency and better pile quality. In addition, a wireless pressure sensor, a high-strength spring and a sealing plunger are installed in the installation cavity of the vacuum back-suction device from top to bottom in sequence, and a multi-layer back-suction hole cooperating with the sealing plunger is provided on the side wall of the installation cavity. The multi-layer back-suction hole is connected with the vacuum back-suction channel of the rotary jet drill rod through the back-suction flow channel on the rod body, and the lower end of the rod body has a back-suction port opposite to the sealing plunger. The sealing plunger can move according to the change in the pressure of the polymer mixture in the ground to control the opening and closing and the opening and closing amplitude of the multi-layer back-suction hole. The vacuum back-suction device is creatively adopted to solve the problem that the prior art cannot adaptively adjust the internal stress of the ground, and the multi-layer back-suction hole is closed by the sealing plunger arranged at the front end of the vacuum back-suction device, so as to achieve a sealing effect. The sealing plug can move as the pressure increases, thereby opening the annular multi-layer back-suction holes. The polymer mixture at the bottom of the hole is transported to the ground recovery device along the multi-layer back-suction holes under the suction of the vacuum pump, automatically achieving the effect of increasing the high-pressure reflux channel. Therefore, no human intervention is required in the entire rotary spraying process, which realizes automation, avoids quality problems caused by human operating errors, and makes the construction operation simpler and more convenient. At the same time, the wireless pressure sensor at the bottom can transmit the pressure in the underground hole to the mechanical equipment operating platform in real time, and can dynamically adjust the pressure in the hole. It no longer relies on imported MJS equipment, which greatly reduces the construction cost of micro-disturbance rotary spraying grouting and can be widely used.

[0030] (2) A multiple high-pressure adaptive micro-disturbance rotary jet drilling tool of the present invention has a stepped rotary joint at the upper end of its rotating shaft body, and a plurality of channels are correspondingly arranged on the stepped surface of the stepped rotary joint. A stepped cavity adapted to the stepped rotary joint is arranged in the diverter housing, and diverter grooves corresponding to the corresponding channels are arranged on the step surface of the stepped cavity. A vacuum back-suction interface, a high-pressure polymer interface and a compressed air interface are respectively connected to the corresponding diverter grooves; a sealing steel ring that seals with the inner wall of the stepped cavity is also respectively arranged on the step side wall of the stepped rotary joint; the stepped rotary joint structure can not only realize uniform diversion of each channel, but also facilitate the sealing assembly between each channel, making the rotary jet diverter more convenient to manufacture, and the number of channels can be increased or decreased according to design requirements, thereby realizing the multi-channel high-pressure rotary jet diversion effect of the drilling tool.

[0031] (3) A multiple high-pressure adaptive micro-disturbance jet grouting drill tool of the present invention has a diverter joint for connecting an extended drill rod or a jet grouting drill rod at the lower end of its rotating shaft body, an extended drill rod upper joint and an extended drill rod lower joint are respectively provided at both ends of the extended drill rod, a jet grouting drill rod upper joint is provided at the upper end of the jet grouting drill rod, the diverter joint is complementary in shape to the extended drill rod upper joint and the jet grouting drill rod upper joint, the extended drill rod lower joint is complementary in shape to the jet grouting drill rod upper joint, and the diverter joint, the extended drill rod upper joint and the extended drill rod lower joint are complementary in shape to the jet grouting drill rod upper joint, and the diverter joint, the extended drill rod upper joint and the extended drill rod lower joint are complementary in shape to the jet grouting drill rod upper joint. The joints on the head and the rotary jet drill pipe both adopt a stepped butt joint structure; the above design can facilitate the assembly of the rotary jet diverter, the extended drill pipe and the rotary jet drill pipe, and the stepped butt joint structure design can facilitate the connection and sealing of each channel, ensure the independence of each channel in the rotary jet drill, and can effectively avoid the blockage of the channel and the nozzle, thereby ensuring the stability and reliability of the rotary jet drill during the construction process; at the same time, the stepped butt joint design has high connection strength and good coaxiality of the drill, which can further improve the construction stability of the drill.

[0032] (4) The present invention provides a multiple high-pressure adaptive micro-disturbance rotary jet drilling tool, wherein the vacuum back-suction channel is located at the center of the rotary jet drill rod, the high-pressure gas channel is located at the outermost side of the rotary jet drill rod, and the high-pressure polymer channel is located between the vacuum back-suction channel and the high-pressure gas channel. In this way, the size of the vacuum back-suction channel can be designed to be larger, and the back-suction flow rate is larger and smoother; at the same time, it can facilitate the setting of multiple dual-channel rotary jet nozzles, facilitate the connection between the high-pressure gas channel and the high-pressure polymer channel and the dual-channel rotary jet nozzle, and facilitate the production of the rotary jet drill rod.

[0033] (5) A multiple high-pressure adaptive micro-disturbance rotary jet drilling tool of the present invention has a confluence block at the lower end of the rotary jet drill pipe for sealing the corresponding high-pressure polymer channels and high-pressure gas channels. The confluence block is provided with a confluence ring groove connected to the corresponding channel. The high-pressure polymer nozzle is respectively connected to the confluence ring groove corresponding to the corresponding high-pressure polymer channel, and the high-pressure gas nozzle is respectively connected to the high-pressure gas channel or the confluence ring groove corresponding to the high-pressure gas channel. With this design, the confluence of various channels in the rotary jet drill pipe can be achieved, the injection pressure of the dual-channel rotary jet nozzle can be ensured, and efficient cutting and stirring of the soil can be achieved. At the same time, the confluence block is used for assembly and sealing, the structure is simple, and the difficulty of making the internal channel of the rotary jet drill pipe is reduced.

[0034] (6) The multiple high-pressure adaptive micro-disturbance jet grouting drill tool of the present invention, wherein the rotating shaft body, the extended drill rod and the jet grouting drill rod are all assembled by sleeve connection of steel pipes, and the corresponding holes on the rotating shaft body, the extended drill rod and the jet grouting drill rod are all arranged on the pipe wall of the corresponding steel pipe, so that the production of the rotating shaft body, the extended drill rod and the jet grouting drill rod is simpler and more convenient, thereby reducing the production cost of the drilling tool; and the drill rod has a high structural strength, and can cope with the micro-disturbance jet grouting pile construction of soils with different physical properties.

[0035] (7) In the present invention, a multiple high-pressure adaptive micro-disturbance rotary jet drilling tool has a vacuum suction device in which a spiral regulator is threadedly connected to the suction port. The spiral regulator has a central through hole. The upper end of the spiral regulator abuts against the lower end surface of the sealing plunger. The spiral regulator also has a screwing structure that facilitates the adjustment operation. The minimum in-hole pressure can be adjusted through the spiral regulator, which facilitates accurate control of the in-hole construction pressure and ensures the quality of pile formation.

[0036] (8) The multiple high-pressure self-adaptive micro-disturbance rotary jet drilling tool of the present invention has a plurality of stirring blades selectively provided on the outer wall of the rotary jet drilling rod, which can be used for the construction of pre-drilled rotary jet mixing piles, so that the polymer mixture is mixed more evenly, and the quality of the piles is further improved; the multiple high-pressure self-adaptive micro-disturbance rotary jet drilling tool is a single-axis rotary jet drilling tool or a multi-axis rotary jet drilling tool. When a multi-axis rotary jet drilling tool structure is adopted, each single-axis rotary jet drilling tool is connected by a multi-axis drill rod support frame, and the multi-axis rotary jet drilling tool can further improve the construction quality and efficiency of high-pressure rotary jetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the split structure of a multiple high-pressure adaptive micro-disturbance jet-jet drilling tool of the present invention;

[0038] Figure 2 It is a schematic diagram of the assembly cross-sectional structure of a multiple high-pressure adaptive micro-disturbance jet-jet drilling tool of the present invention;

[0039] Figure 3 for Figure 2Schematic diagram of the local enlarged structure at K in the middle;

[0040] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotary jet splitter in the present invention;

[0041] Figure 5 It is a cross-sectional structural schematic diagram of the rotary jet splitter in the present invention;

[0042] Figure 6 It is a schematic diagram of the split structure of the rotary jet splitter in the present invention;

[0043] Figure 7 It is a schematic diagram of the three-dimensional structure of the lengthened drill rod in the present invention;

[0044] Figure 8 It is a schematic cross-sectional structure diagram of the lengthened drill rod in the present invention;

[0045] Fig. 9 It is a schematic diagram of the three-dimensional structure of the rotary jet drilling rod in the present invention;

[0046] Fig.10 It is a schematic cross-sectional structure diagram of the rotary jet drilling rod in the present invention;

[0047] Fig.11 for Fig.10 A schematic diagram of the local enlarged structure at M in the middle;

[0048] Fig.12 It is a schematic diagram of the three-dimensional structure of the vacuum back-suction device in the present invention;

[0049] Fig.13 It is a cross-sectional structural schematic diagram of the vacuum back-sucking device of the present invention (the sealing plunger is in a normally closed state);

[0050] Fig.14 It is a cross-sectional structural schematic diagram of the vacuum back-sucking device of the present invention (the sealing plunger is in a pressurized and opened state);

[0051] Fig.15 It is a schematic diagram of the structure of the multi-wing alloy drill bit of the present invention;

[0052] Fig.16 It is a schematic diagram of the structure of the down-the-hole hammer drill bit of the present invention;

[0053] Fig.17 It is a schematic diagram of the structure of a single-axis rotary jet drilling tool with a stirring blade in the present invention;

[0054] Fig.18 It is a schematic diagram of the structure of a three-axis rotary jet drilling tool with stirring blades in the present invention.

[0055] Explanation of the symbols in the schematic diagram:

[0056] 1. Spray jet diverter; 1-1. Diverter housing; 1-2. Rotating shaft; 1-2-1. Diverter joint; 1-2-2. Stepped rotary joint; 1-2-3. Sealing steel ring; 1a. Vacuum suction interface; 1b. First high-pressure polymer interface; 1c. Second high-pressure polymer interface; 1d. Third high-pressure polymer interface; 1e. Compressed air interface; 2. Extended drill pipe; 2-1. Extended drill pipe upper joint; 2-2. Extended drill pipe lower joint; 3. Spray jet drill pipe; 3a. Vacuum suction channel; 3b. First high-pressure polymer channel; 3c. Second high-pressure polymer channel; 3d. Third high-pressure polymer Material channel; 3e, high-pressure gas channel; 3-1, rotary jet drill pipe upper joint; 3-2, dual-channel rotary jet nozzle; 3-2a, high-pressure polymer nozzle; 3-2b, high-pressure gas nozzle; 3-3, confluence block; 3-3-1, confluence ring groove; 3-4, stirring blade; 4, vacuum back-suction device; 4-1, rod body; 4-1-1, back-suction port; 4-1-2, multi-layer back-suction hole; 4-1-3, back-suction flow channel; 4-1-4, confluence cavity; 4-2, wireless pressure sensor; 4-3, high-strength spring; 4-4, sealing plunger; 4-5, spiral adjuster; 5, drill bit; 6, multi-axis drill pipe support frame. DETAILED DESCRIPTION

[0057] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0058] [Example 1]

[0059] like Figures 1 to 14 As shown, a multiple high-pressure adaptive micro-disturbance jetting drilling tool of this embodiment includes a jetting diverter 1, a jetting drill rod 3, a vacuum suction device 4 and a drill bit 5 which are arranged in sequence, wherein:

[0060] The rotary jet diverter 1 includes a diverter housing 1-1 and a rotating shaft body 1-2 that can rotate freely in the diverter housing 1-1. The diverter housing 1-1 has at least a vacuum back-suction interface 1a, a high-pressure polymer interface and a compressed air interface 1e. The rotating shaft body 1-2 has channels that are independent of each other and connected to the corresponding vacuum back-suction interface 1a, high-pressure polymer interface and compressed air interface 1e. During operation, the diverter housing 1-1 and the rotating shaft body 1-2 can rotate relative to each other, so that the rotary jet drilling tool can rotate continuously, overcoming the deficiency that the MJS equipment can only perform swing jetting operations. In addition, the relative rotation of the diverter housing 1-1 and the rotating shaft body 1-2 will not affect the connection between the vacuum back-suction interface 1a, the high-pressure polymer interface and the compressed air interface 1e and the corresponding channels, so that multi-level rotary jetting operations can be set up as needed to increase the construction speed. Refer to Figures 4 to 6As shown, in this embodiment, the upper end of the rotating shaft body 1-2 has a stepped rotary joint 1-2-2, and a plurality of channels are correspondingly arranged on the stepped surface of the stepped rotary joint 1-2-2, and the channels can be circular through holes uniformly distributed on the corresponding stepped surfaces; the diverter housing 1-1 has a stepped cavity adapted to the above-mentioned stepped rotary joint 1-2-2, and a diverter groove corresponding to the corresponding channel is arranged on the step surface of the stepped cavity, and the vacuum back-suction interface 1a, the high-pressure polymer interface and the compressed air interface 1e are respectively connected to the corresponding diverter grooves; the back-suction channel in the drilling tool is connected to the vacuum back-suction interface 1a through the diverter groove, and can be connected to the ground recovery device through the vacuum back-suction interface 1a, the high-pressure polymer interface can be connected to the ground high-pressure pump, the high-pressure pump inputs the polymer from the corresponding high-pressure polymer interface into the drilling tool, and distributes it to each polymer channel through the corresponding diverter groove, the compressed air interface 1e can be connected to the ground air compressor, the air compressor inputs the compressed air from the compressed air interface 1e into the drilling tool, and distributes it to each high-pressure air channel through the corresponding diverter groove. The above-mentioned stepped rotary joint structure can not only realize the uniform flow diversion of each channel, but also facilitate the sealing assembly between each channel, making the production of the rotary jet diverter more convenient, and the number of channels can be increased or decreased according to the design requirements, realizing the multi-channel high-pressure rotary jet diverter effect of the drilling tool. In order to ensure the sealing between each channel, the step side wall of the stepped rotary joint 1-2-2 is also provided with a sealing steel ring 1-2-3 that is sealed with the inner side wall of the stepped cavity. The sealing steel ring 1-2-3 can be made of a high-elastic steel ring, which can ensure the sealing between the internal channels of the rotary jet diverter 1, and at the same time ensure the stable rotation of the diverter housing 1-1 and the rotating shaft body 1-2. Since the diverter housing 1-1 with the vacuum back suction interface 1a, the high-pressure polymer interface and the compressed air interface 1e does not rotate with the rotating shaft body 1-2, the rotary jet diverter 1 can be made to rotate continuously, meeting the construction requirements of the continuously rotating mixing pile and the high-pressure rotary jet pile.

[0061] The upper end of the jet grouting drill rod 3 is directly or indirectly connected to the rotary shaft 1-2 of the jet grouting diverter 1 through the extended drill rod 2. According to the designed pile foundation depth, the jet grouting drill rod 3 can be directly installed on the jet grouting diverter 1 for use, or the length of the jet grouting drill rod 3 penetrating into the ground can be increased by extending the drill rod 2. The number of extended drill rods 2 can also be determined according to needs. Figure 3As shown, the above-mentioned jet grouting drill rod 3 has a vacuum back-suction channel 3a connected to the above-mentioned vacuum back-suction interface 1a, a high-pressure polymer channel connected to the above-mentioned high-pressure polymer interface, and a high-pressure gas channel 3e connected to the above-mentioned compressed air interface 1e. At least two groups of double-channel jet grouting nozzles 3-2 are axially spaced on the side wall of the jet grouting drill rod 3. Each group of double-channel jet grouting nozzles 3-2 includes a high-pressure polymer nozzle 3-2a and a high-pressure gas nozzle 3-2b located at the periphery of the high-pressure polymer nozzle 3-2a. The high-pressure polymer nozzle 3-2a is connected to the corresponding high-pressure polymer channel, and the high-pressure gas nozzle 3-2b is connected to the corresponding high-pressure gas channel 3e. The polymer input by the high-pressure polymer interface is transported to the high-pressure polymer nozzle 3-2a through the high-pressure polymer channel and ejected outwardly, and the high-pressure air input by the compressed air interface 1e is transported to the high-pressure gas nozzle 3-2b through the high-pressure gas channel 3e and ejected outwardly. During this process, high-pressure polymer is ejected from the central high-pressure polymer nozzle 3-2a, and high-pressure gas surrounds the high-pressure polymer jet and is ejected from the high-pressure gas nozzle 3-2b. The high-pressure gas can protect the high-pressure strength of the high-pressure polymer jet, thereby ensuring that the high-pressure jet cuts the soil more effectively. Figures 9 to 11 As shown, taking the setting of three groups of dual-channel rotary jet nozzles 3-2 as an example, the three groups of dual-channel rotary jet nozzles 3-2 are arranged on the outer side wall of the rotary jet drill pipe 3 along the axial direction of the drill tool, and correspondingly, the high-pressure polymer channel is also provided with three independent groups, namely the first high-pressure polymer channel 3b, the second high-pressure polymer channel 3c and the third high-pressure polymer channel 3d, the first high-pressure polymer channel 3b, the second high-pressure polymer channel 3c and the third high-pressure polymer channel 3d are arranged from the inside to the outside, and similarly, the high-pressure polymer interface on the rotary jet diverter 1 is also provided with three groups, namely the first high-pressure polymer interface 1b, the second high-pressure polymer interface 1c and the third high-pressure polymer interface 1d, the first high-pressure polymer The interface 1b is connected to the high-pressure polymer nozzle 3-2a in the lowermost dual-channel rotary spray nozzle 3-2 through the corresponding first high-pressure polymer channel 3b, the second high-pressure polymer interface 1c is connected to the high-pressure polymer nozzle 3-2a in the middle dual-channel rotary spray nozzle 3-2 through the corresponding second high-pressure polymer channel 3c, and the third high-pressure polymer interface 1d is connected to the high-pressure polymer nozzle 3-2a in the uppermost dual-channel rotary spray nozzle 3-2 through the corresponding third high-pressure polymer channel 3d. In this way, the three groups of dual-channel rotary spray nozzles 3-2 can independently configure high-pressure polymer jets, and can perform high-pressure jet cutting and mixing of soil at multiple levels. The construction speed is three times that of the existing technology, and the pile quality is better.

[0062] The vacuum back-suction device 4 includes a rod body 4-1 fixedly mounted on the lower end of the jet grouting drill rod 3, and an installation cavity is arranged in the rod body 4-1, and a wireless pressure sensor 4-2, a high-strength spring 4-3 and a sealing plunger 4-4 are sequentially installed in the installation cavity from top to bottom, one end of the high-strength spring 4-3 acts on the wireless pressure sensor 4-2, and the other end acts on the sealing plunger 4-4, and a multi-layer back-suction hole 4-1-2 cooperating with the sealing plunger 4-4 is arranged on the side wall of the installation cavity, and the multi-layer back-suction hole 4-1-2 is connected with the vacuum back-suction channel 3a of the jet grouting drill rod 3 through the back-suction channel 4-1-3 on the rod body 4-1, and the lower end of the rod body 4-1 has a back-suction port 4-1-1 opposite to the sealing plunger 4-4, and the sealing plunger 4-4 can move according to the change of the pressure of the polymer mixture in the ground to control the opening and closing and the opening and closing amplitude of the multi-layer back-suction hole 4-1-2. For details, refer to Figure 12 to Figure 14 As shown, for the convenience of manufacturing, the installation cavity and the back-suction channel 4-1-3 can be arranged on the central insert, and the central insert is integrally installed inside the mounting rod body 4-1, and the back-suction channel 4-1-3 is distributed on the periphery of the installation cavity. The multi-layer back-suction holes 4-1-2 are arranged at the lower part of the installation cavity, and multiple layers can be evenly distributed circumferentially. The sealing plunger 4-4 can slide up and down in the installation cavity, and is kept in a closed state of the multi-layer back-suction holes 4-1-2 under the action of the high-strength spring 4-3 (such as Fig.13 As shown in the figure, at this time, since the multi-layer back-suction holes 4-1-2 are closed, the underground mixed liquid will not be back-sucked; when the pressure of the underground mixed liquid increases and the pressure of the mixed liquid on the sealing plunger 4-4 is greater than the elastic force of the high-strength spring 4-3, the sealing plunger 4-4 is forced to move upward, and at this time, part of the multi-layer back-suction holes 4-1-2 are opened, and then the vacuum pump is used to suck the polymer mixed liquid at the bottom of the hole to the ground recovery device (as shown in the figure). Fig.14 As shown), the pressure at the bottom of the hole is reduced; the greater the pressure of the mixed liquid at the bottom of the hole, the greater the opening of the multi-layer back-suction holes 4-1-2, and the greater the amount of mixed liquid back-suction. When the pressure of the mixed liquid at the bottom of the hole decreases with the back-suction, the sealing plunger 4-4 moves downward to reduce the opening amount of the multi-layer back-suction holes 4-1-2 or close the multi-layer back-suction holes 4-1-2, thereby realizing adaptive regulation of the bottom hole pressure. The high-strength spring 4-3 mentioned above adopts a high-strength and high-manganese alloy compression spring. The pressure of the high-strength spring 4-3 changes with the movement of the sealing plunger 4-4 and is detected by the wireless pressure sensor 4-2. The wireless pressure sensor 4-2 can transmit the pressure in the hole to the ground mechanical equipment operating platform in real time. The ground mechanical equipment operating platform can adjust the pumping pressure and other parameters of the high-pressure pump according to the pressure in the hole, and dynamically adjust the pressure in the hole. There is a confluence chamber 4-1-4 at the top of the rod body 4-1, and several suction channels 4-1-3 are connected to the confluence chamber 4-1-4. After the rod body 4-1 is installed to the lower end of the rotary jet drilling rod 3, the confluence chamber 4-1-4 is connected to the vacuum suction channel 3a.

[0063] The drill bit 5 is fixedly installed at the lower end of the rod body 4-1 of the vacuum suction device 4. It should be understood that the drill bit 5 should not block the suction port 4-1-1 after installation. For this reason, in this embodiment, a corresponding through hole is provided on the drill bit 5 to keep the suction port 4-1-1 unobstructed. According to different soil layer conditions, the drill bit 5 can adopt a multi-wing alloy drill bit or a down-the-hole hammer drill bit. Fig.15 The four-wing alloy drill bit is shown. Fig.16 Shown is a down-the-hole hammer drill bit.

[0064] The multiple high-pressure adaptive micro-disturbance jet grouting drill tool of this embodiment organically combines multi-level point high-pressure jet grouting with micro-disturbance adaptive back-absorption technology, and creatively adopts a multi-channel high-pressure jet grouting diverter, so that the lower part of the jet grouting drill rod can use multiple double-channel jet grouting nozzles to realize high-pressure jetting at multiple levels. Since high-pressure jet jet cutting and mixing of soil can be carried out at multiple levels, each additional level can double the construction efficiency, thereby achieving a multiple increase in construction efficiency and better pile quality. In addition, the creative use of a vacuum back-absorption device solves the problem that the existing technology cannot adaptively adjust the internal stress of the ground, and automatically achieves the effect of increasing the pressure return channel, so that no manual intervention is required in the entire jet grouting process, automation is achieved, quality problems caused by manual operation errors are avoided, and construction operations are simpler and more convenient; at the same time, the wireless pressure sensor can be used to transmit the pressure in the underground hole to the mechanical equipment operating platform in real time, and the pressure in the hole can be dynamically adjusted, no longer relying on imported MJS equipment, so that the construction cost of micro-disturbance jet grouting is greatly reduced, and it can be widely used.

[0065] Reference Figure 1 , Figure 2 as well as Figures 4 to 10As shown, in this embodiment, the lower end of the rotating shaft body 1-2 has a diverter joint 1-2-1 for connecting the extended drill rod 2 or the rotary jet drill rod 3, the two ends of the extended drill rod 2 are respectively provided with an extended drill rod upper joint 2-1 and an extended drill rod lower joint 2-2, the upper end of the rotary jet drill rod 3 is provided with a rotary jet drill rod upper joint 3-1, the diverter joint 1-2-1 is complementary in shape to the extended drill rod upper joint 2-1 and the rotary jet drill rod upper joint 3-1, the extended drill rod lower joint 2-2 is complementary in shape to the rotary jet drill rod upper joint 3-1, and the diverter joint 1-2-1, the extended drill rod upper joint 2-1, the extended drill rod lower joint 2-2 and the rotary jet drill rod upper joint 3-1 all adopt a stepped butt joint structure. For example, when the diverter joint 1-2-1 adopts a stepped convex joint, the extended drill pipe upper joint 2-1 adopts a stepped concave joint with complementary shapes, the extended drill pipe lower joint 2-2 adopts a stepped convex joint, and the rotary jet drill pipe upper joint 3-1 adopts a stepped concave joint with complementary shapes. The above design can facilitate the assembly of the rotary jet diverter 1, the extended drill pipe 2 and the rotary jet drill pipe 3, and the stepped butt joint structural design can facilitate the connection and sealing of each channel, ensure the independence of each channel in the rotary jet drill, effectively avoid the blockage of the channel and the nozzle, and ensure the stability and reliability of the rotary jet drill during the construction process; at the same time, the stepped butt joint design has high connection strength and good drill coaxiality, which can further improve the construction stability of the drill. In addition, the rotary jet diverter 1, the extended drill pipe 2 and the rotary jet drill pipe 3 can be fixed by the threaded connection of the stepped joint, or the stepped butt joint can be connected and flanged.

[0066] In this embodiment, the vacuum back-suction channel 3a is located at the center of the rotary jet drill pipe 3, the high-pressure gas channel 3e is located at the outermost side of the rotary jet drill pipe 3, and the high-pressure polymer channel is located between the vacuum back-suction channel 3a and the high-pressure gas channel 3e. The vacuum back-suction channel 3a is a central circular hole, and the high-pressure polymer channel and the high-pressure gas channel 3e are a number of through holes evenly distributed circumferentially. In this way, the size of the vacuum back-suction channel 3a can be designed to be larger, and the back-suction flow rate can be larger and smoother; at the same time, it can facilitate the setting of multiple dual-channel rotary jet nozzles 3-2, facilitate the connection between the high-pressure gas channel 3e and the high-pressure polymer channel and the dual-channel rotary jet nozzle 3-2, and facilitate the production of the rotary jet drill pipe. Specifically, such as Fig.11As shown, the lower end of the jet grouting drill rod 3 has a confluence block 3-3 for blocking the corresponding high-pressure polymer channel and high-pressure gas channel 3e, and the confluence ring groove 3-3-1 connected to the corresponding channel is provided on the confluence block 3-3, and the high-pressure polymer nozzle 3-2a is respectively connected to the confluence ring groove 3-3-1 corresponding to the corresponding high-pressure polymer channel, and the high-pressure gas nozzle 3-2b is respectively connected to the high-pressure gas channel 3e or the confluence ring groove 3-3-1 corresponding to the high-pressure gas channel 3e. With this design, the confluence of each channel in the jet grouting drill rod 3 can be achieved, the injection pressure of the dual-channel jet grouting nozzle 3-2 can be ensured, and the efficient cutting and stirring of the soil can be achieved; at the same time, the confluence block 3-3 is used for assembly and blocking, the structure is simple, and the difficulty of making the internal channel of the jet grouting drill rod 3 is reduced.

[0067] Furthermore, in order to facilitate the production of the jet grouting drill tool, the rotating shaft 1-2, the extended drill rod 2 and the jet grouting drill rod 3 are all assembled by sleeve connection of steel pipes, and the corresponding holes on the rotating shaft 1-2, the extended drill rod 2 and the jet grouting drill rod 3 are all arranged on the pipe wall of the corresponding steel pipe. With the above-mentioned steel pipe sleeve assembly structure, the production of the rotating shaft 1-2, the extended drill rod 2 and the jet grouting drill rod 3 is simpler and more convenient, which reduces the production cost of the drilling tool; and the drill rod structure has high strength and can cope with the micro-disturbance jet grouting pile construction of soils with different physical properties. Figure 5 and Figure 6As shown, the rotating shaft body 1-2 is made of 5 layers of steel pipes, the central hole of the first circle of steel pipes from the inside to the outside is the suction channel connected to the vacuum suction interface 1a, and the several through holes distributed around the tube wall are the first high-pressure polymer channels connected to the first high-pressure polymer interface 1b, and the upper ends of the first high-pressure polymer channels are connected through the corresponding diverter grooves in the diverter shell 1-1; the second circle of steel pipes is sleeved on the outside of the first circle of steel pipes, and the height of the second circle of steel pipes is less than the height of the first circle of steel pipes to form a stepped structure at both ends, and the several through holes distributed around the tube wall of the second circle of steel pipes are the second high-pressure polymer channels connected to the second high-pressure polymer interface 1c, and the upper ends of the second high-pressure polymer channels are connected through the corresponding diverter grooves in the diverter shell 1-1; the third circle of steel pipes The pipe sleeve is arranged on the outside of the second circle of steel pipe, and the height of the third circle of steel pipe is less than that of the second circle of steel pipe, so as to form a stepped structure at both ends. The several through holes distributed around the pipe wall of the third circle of steel pipe are the third high-pressure polymer channels connected to the third high-pressure polymer interface 1d, and the upper ends of each third high-pressure polymer channel are connected through the corresponding diverter groove in the diverter shell 1-1; the fourth circle of steel pipe sleeve is arranged on the outside of the third circle of steel pipe, and the height of the fourth circle of steel pipe is less than that of the third circle of steel pipe, so as to form a stepped structure at both ends. The several through holes distributed around the pipe wall of the fourth circle of steel pipe are the high-pressure air channels connected to the compressed air interface 1e, and the upper ends of each high-pressure air channels are connected through the corresponding diverter groove in the diverter shell 1-1; the fifth circle of steel pipe sleeve is arranged on the outside of the fourth circle of steel pipe. The structure of the extended drill pipe 2 and the rotary jet drill pipe 3 is similar to that of the above-mentioned rotating shaft body 1-2, and the main difference lies in the difference in the height and combination position of each circle of steel pipe. For example, Figure 7 and Figure 8 As shown, the heights of the steel pipes of the extended drill pipe 2 are substantially the same, and the steel pipes are staggered and spliced ​​from the inside to the outside to form a stepped joint structure; Fig.10 and Fig.11 As shown, the heights of the various circles of steel pipe of the jet grouting drill rod 3 are different. When combined to form a stepped joint structure on the upper part of the jet grouting drill rod 3, an assembly space for installing a manifold block 3-3 is reserved at the lower end according to the position of each dual-channel jet grouting nozzle 3-2. The manifold block 3-3 is used to achieve the blocking and gathering and connecting functions of the corresponding channels.

[0068] Reference Fig.13 and Fig.14As shown, in the above-mentioned vacuum back-suction device 4, a spiral regulator 4-5 is also threadedly connected in the back-suction port 4-1-1, and the spiral regulator 4-5 has a central through hole. The upper end of the spiral regulator 4-5 abuts against the lower end surface of the sealing plunger 4-4, and the spiral regulator 4-5 also has a screwing structure that is convenient for adjustment operation. The spiral regulator 4-5 can be rotated by the screwing structure, so that the spiral regulator 4-5 moves up and down relative to the rod body 4-1, and then the initial position of the sealing plunger 4-4 and the initial compression state of the high-strength spring 4-3 can be adjusted, and the minimum hole pressure can be adjusted, which is convenient for accurate control of the hole construction pressure and ensuring the quality of pile formation. The above-mentioned screwing structure can adopt at least two cylinders arranged on the lower end surface of the spiral regulator 4-5, and the cylinders are connected and rotated by a special tool to realize the position adjustment of the spiral regulator 4-5, or the central through hole of the spiral regulator 4-5 can be designed as an inner hexagonal shape, and adjusted by an inner hexagonal wrench.

[0069] The construction steps of the multiple high-pressure adaptive micro-disturbance jet-jet drilling tool of this embodiment are roughly as follows:

[0070] The first step is to investigate and understand the engineering geological conditions, engineering design drawings, surrounding pipelines and environmental conditions, and set up monitoring points around the project;

[0071] The second step is to determine the minimum borehole pressure value that does not affect the surrounding pipelines and the environment;

[0072] Step 3: Adjust the high-strength spring 4-3 and the spiral regulator 4-5 in the vacuum suction device 4 to ensure that the polymer mixture above the minimum hole pressure value can be sucked up to the ground recovery device by the vacuum pump;

[0073] Step 4: Drilling down, according to the wireless pressure sensor 4-2, when the pressure in the hole reaches the minimum pressure value in the hole, start the vacuum pump to suck the polymer mixture in the hole.

[0074] Step 5: Keep an eye on the construction until the first pile is completed.

[0075] Step 6: According to the monitoring results, timely adjust the high-strength spring 4-3 and the spiral regulator 4-5 in the vacuum suction device 4 to ensure that the minimum hole pressure value is within the allowable range.

[0076] Step 7. Based on the monitoring results, continue construction until the project is completed.

[0077] [Example 2]

[0078] The basic structure and working principle of a multiple high-pressure adaptive micro-disturbance jet-jet drilling tool of this embodiment are the same as those of embodiment 1, except that:

[0079] like Fig.17As shown, in this embodiment, a plurality of stirring blades 3-4 are selectively provided on the outer wall of the jet grouting drill rod 3. The stirring blades 3-4 can stir the polymer mixture during construction, so that the polymer mixture is mixed more evenly, further improving the quality of the piles, and can be used for the construction of pre-drilled jet grouting piles.

[0080] In addition, the multiple high-pressure adaptive micro-disturbance jet grouting drill is a single-axis jet grouting drill or a multi-axis jet grouting drill. The structure of the single-axis jet grouting drill is as follows: Fig.17 As shown, the structure of the multi-axis jet grouting drill is as follows: Fig.18 When a multi-axis jet grouting drilling tool structure is adopted, each single-axis jet grouting drilling tool is connected by a multi-axis drill rod support frame 6, and the multi-axis jet grouting drilling tool can further improve the construction quality and efficiency of high-pressure jet grouting.

[0081] It is worth noting that the above-mentioned polymer refers to cement slurry, curing agent, and various high molecular polymers, and the polymer mixture refers to a mixture formed by mixing cement slurry, curing agent, and various high molecular polymers with soil and air.

[0082] Compared with the prior art, the multiple high-pressure adaptive micro-disturbance jetting drilling tool of the present invention has at least the following advantages:

[0083] 1. Solved the problem of low efficiency of existing high-pressure jet spraying construction

[0084] A multi-channel high-pressure rotary jet diverter is creatively adopted. Multiple high-pressure rotary nozzles are used at the bottom of the drill bit to realize high-pressure jetting at multiple levels. Since high-pressure jets can be used to cut and mix the soil at multiple levels, the speed can be doubled with each additional level, thereby achieving a multiple increase in construction efficiency and better pile quality. At the same time, each level injection point is a dual-channel rotary jet nozzle of high-pressure gas and high-pressure polymer. The high-pressure polymer is ejected from the center, and the high-pressure gas is ejected together around the high-pressure polymer jet, which protects the high-pressure strength of the high-pressure polymer jet, thereby ensuring that the high-pressure jet cuts the soil more effectively.

[0085] 2. Solved the problems of high-pressure jet grouting piles easily producing soil squeezing effect, high construction cost and long construction period of micro-disturbance mixing piles, high cost of MJS equipment and limitations in application.

[0086] In view of the above technical problems, the core is to reduce the stress in the hole in real time and reduce the cost at the same time. Although the MJS (Mechanical Jetting System) equipment has the function of sensing underground stress, it relies on the operator to manually adjust the back-suction flow rate according to the sensing results, and cannot realize automatic adjustment. This not only increases the complexity of operation, but also may affect the construction quality due to operational errors; in addition, the high cost of the MJS equipment makes it difficult to popularize in cost-sensitive projects. The present invention creatively adopts a vacuum back-suction device. First, by selecting springs with different elastic forces, the minimum pressure in the hole can be determined. During construction, the high-pressure mixed polymer transmits the pressure to the sealing plunger at the front end of the vacuum back-suction device in the underground space, thereby pressing the high-strength spring at the rear end, so that the sealing plunger moves backward as the pressure increases, thereby opening the annular multi-layer back-suction channel, and the polymer mixture at the bottom of the hole is transported to the ground recovery device along the multi-layer back-suction channel under the suction of the vacuum pump. Since the entire micro-perturbation vacuum back-suction device automatically realizes the effect of increasing the pressure reflux channel, no manual intervention is required in the entire rotary spraying process, automation is realized, and quality problems caused by manual operation errors are avoided. At the same time, the wireless pressure sensor at the bottom can transmit the underground hole pressure to the mechanical equipment operating platform in real time, and can dynamically adjust the hole pressure. Since the entire drilling tool is fully domestically produced and does not rely on imports, the construction cost of micro-disturbance rotary jet grouting is greatly reduced, and it can be widely used.

[0087] The present invention and its embodiments are described schematically above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and creatively designs a structure and an embodiment similar to the technical solution without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A multiple high-pressure adaptive micro-disturbance jet grouting drilling tool, characterized in that: include A rotary jet splitter (1), the rotary jet splitter (1) comprising a splitter housing (1-1) and a rotating shaft (1-2) capable of freely rotating in the splitter housing (1-1), the splitter housing (1-1) having at least a vacuum back-suction interface (1a), a high-pressure polymer interface and a compressed air interface (1e), the rotating shaft (1-2) having channels that are independent of each other and communicate with the corresponding vacuum back-suction interface (1a), the high-pressure polymer interface and the compressed air interface (1e); and, A jet grouting drill rod (3), the upper end of which is directly or indirectly connected to a rotary shaft (1-2) of a jet grouting splitter (1) through an extended drill rod (2), the jet grouting drill rod (3) having a vacuum back-suction channel (3a) connected to the vacuum back-suction interface (1a), a high-pressure polymer channel connected to the high-pressure polymer interface, and a high-pressure gas channel (3e) connected to the compressed air interface (1e), at least two groups of dual-channel jet grouting nozzles (3-2) are axially spaced on the side wall of the jet grouting drill rod (3), each group of the dual-channel jet grouting nozzles (3-2) comprising a high-pressure polymer nozzle (3-2a) and a high-pressure gas nozzle (3-2b) located at the periphery of the high-pressure polymer nozzle (3-2a), the high-pressure polymer nozzle (3-2a) being connected to a corresponding high-pressure polymer channel, and the high-pressure gas nozzle (3-2b) being connected to a corresponding high-pressure gas channel (3e); and, A vacuum suction device (4), the vacuum suction device (4) comprising a rod body (4-1) fixedly mounted on the lower end of a jet-jet drill rod (3), the rod body (4-1) being provided with an installation cavity, the installation cavity being provided with a wireless pressure sensor (4-2), a high-strength spring (4-3) and a sealing plunger (4-4) in sequence from top to bottom, one end of the high-strength spring (4-3) acting on the wireless pressure sensor (4-2), and the other end acting on the sealing plunger (4-4), the side wall of the installation cavity being provided with a sealing plunger (4-4) The multi-layered back-suction hole (4-1-2) is matched with the multi-layered back-suction hole (4-1-2) of the rotary jet drilling rod (3) through the back-suction channel (4-1-3) on the rod body (4-1), and the lower end of the rod body (4-1) has a back-suction port (4-1-1) opposite to the sealing plunger (4-4), and the sealing plunger (4-4) can move according to the change of the pressure of the polymer mixed liquid in the ground to control the opening and closing and the opening and closing amplitude of the multi-layered back-suction hole (4-1-2); and A drill bit (5) is fixedly mounted on the lower end of a rod body (4-1) of the vacuum suction device (4).

2. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 1 is characterized in that: The upper end of the rotating shaft body (1-2) is provided with a stepped rotating joint (1-2-2), and a plurality of holes are correspondingly arranged on the stepped surface of the stepped rotating joint (1-2-2); the diverter housing (1-1) has a stepped cavity matched with the stepped rotating joint (1-2-2), and a diverter groove corresponding to the corresponding hole is arranged on the step surface of the stepped cavity; the vacuum suction interface (1a), the high-pressure polymer interface and the compressed air interface (1e) are respectively connected to the corresponding diverter grooves; and the step side walls of the stepped rotating joint (1-2-2) are also respectively provided with sealing steel rings (1-2-3) that are sealed with the inner side walls of the stepped cavity.

3. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 2 is characterized in that: The lower end of the rotary shaft body (1-2) is provided with a diverter joint (1-2-1) for connecting an extended drill rod (2) or a jet-jet drill rod (3); the two ends of the extended drill rod (2) are respectively provided with an extended drill rod upper joint (2-1) and an extended drill rod lower joint (2-2); the upper end of the jet-jet drill rod (3) is provided with a jet-jet drill rod upper joint (3-1); the diverter joint (1-2-1) is complementary in shape to the extended drill rod upper joint (2-1) and the jet-jet drill rod upper joint (3-1); the extended drill rod lower joint (2-2) is complementary in shape to the jet-jet drill rod upper joint (3-1); and the diverter joint (1-2-1), the extended drill rod upper joint (2-1), the extended drill rod lower joint (2-2) and the jet-jet drill rod upper joint (3-1) all adopt a stepped butt joint structure.

4. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 1 is characterized in that: The vacuum back-suction channel (3a) is located at the center of the rotary jet drill rod (3), the high-pressure gas channel (3e) is located at the outermost side of the rotary jet drill rod (3), and the high-pressure polymer channel is located between the vacuum back-suction channel (3a) and the high-pressure gas channel (3e).

5. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 4 is characterized in that: The lower end of the jet grouting drill rod (3) has a confluence block (3-3) for blocking the corresponding high-pressure polymer channel and the high-pressure gas channel (3e); the confluence block (3-3) is provided with a confluence ring groove (3-3-1) connected to the corresponding channel; the high-pressure polymer nozzle (3-2a) is respectively connected to the confluence ring groove (3-3-1) corresponding to the corresponding high-pressure polymer channel; and the high-pressure gas nozzle (3-2b) is respectively connected to the high-pressure gas channel (3e) or the confluence ring groove (3-3-1) corresponding to the high-pressure gas channel (3e).

6. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 5 is characterized in that: The rotating shaft body (1-2), the lengthened drill rod (2) and the jet-jet drill rod (3) are all assembled by sleeve-jointing steel pipes, and the corresponding holes on the rotating shaft body (1-2), the lengthened drill rod (2) and the jet-jet drill rod (3) are all arranged on the pipe walls of the corresponding steel pipes.

7. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 1 is characterized in that: In the vacuum suction back device (4), the suction back port (4-1-1) is internally threadedly connected to a spiral adjuster (4-5), the spiral adjuster (4-5) has a central through hole, the upper end of the spiral adjuster (4-5) abuts against the lower end surface of the sealing plunger (4-4), and the spiral adjuster (4-5) also has a screwing structure for facilitating adjustment operations.

8. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 1 is characterized in that: The drill bit (5) is a multi-wing alloy drill bit or a down-the-hole hammer drill bit.

9. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to any one of claims 1 to 8, characterized in that: A plurality of stirring blades (3-4) are also selectively provided on the outer wall of the jet-jet drill rod (3).

10. The multiple high-pressure adaptive micro-disturbance jet grouting drilling tool according to claim 9, characterized in that: The multiple high-pressure self-adaptive micro-disturbance jet grouting drill tool is a single-axis jet grouting drill tool or a multi-axis jet grouting drill tool. When a multi-axis jet grouting drill tool structure is adopted, each single-axis jet grouting drill tool is connected via a multi-axis drill rod support frame (6).

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