An active sand supply type abrasive water jet pipe jacking machine device and its method

Abstract

The present invention belongs to the field of tunneling devices, and provides an active sand supply abrasive water jet pipe jacking machine device and its method. Among them, the active sand supply abrasive water jet pipe jacking machine device includes a rotary center, an active sand supply system, a degassing mechanism, a cutter head and a control system; the rotary center is arranged at the rear end of the cutter head and is used for dynamically and statically separating the high-pressure water, abrasive and high-pressure gas transmitted to the cutter head; combined cutters are installed on the cutter head; a pneumatic conveying device is arranged between the rotary center and the cutter head, and the active sand supply system is connected to the control system; the active sand supply system includes a sand box and an abrasive supply pipe, one end of the abrasive supply pipe is connected to the sand box, and the other end passes through the rotary center, passes through the degassing mechanism and extends into the combined cutter to provide abrasive for the combined cutter; the degassing mechanism is arranged between the rotary center and the combined cutter; the degassing mechanism adopts a bearing form and rotates relative to the cutter head inside it; the degassing mechanism is used to discharge the gas in the abrasive supply pipeline.

Description

Technical Field

[0001] The invention belongs to the field of tunneling devices, and particularly relates to an active sand-supplying abrasive water jet pipe jacking machine device and a method thereof. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] During the construction process of the pipe jacking machine, complex strata and solid obstacles will be encountered, such as boulders, soft upper and hard lower strata, reinforced concrete piles and segment structures, etc. Problems such as abnormal damage of cutters and jamming of the cutter head by steel bars often occur, resulting in a decrease in the construction efficiency of the pipe jacking and an increase in the cost. Especially when the pipe jacking machine excavates the reinforced concrete / fiberglass-reinforced pipe segment structure, due to the poor fit between the flat cutter head and the arc-shaped segment, the tunnel segment and the cutter head are prone to instability. It is urgent to break through the above problems to help the pipe jacking machine equipment successfully complete the construction of urban underground pipe corridors under these complex geological conditions.

[0004] The high-pressure abrasive water jet accelerates abrasive particles by using ultra-high-speed water flow, and cuts and breaks rocks by means of the impact of abrasive particles. It has the advantages of low cost, good environmental adaptability, high efficiency and dust-free. The high-pressure abrasive water jet has also been applied in the fields of assisting drill bits and pick drilling and coal mining for rock breaking. With the progress and maturity of technology, it has gradually become a reality to improve the tunneling ability of the tunneling machine by mounting the high-pressure water jet technology on the pipe jacking machine, but the following problems still exist:

[0005] (1) In terms of the system mounting of the abrasive water jet pipe jacking machine: there is no systematic mounting implementation plan and key technologies.

[0006] (2) In terms of the multi-medium central rotation of the abrasive water jet: the medium rotation supply is not yet mature, especially lacking a long-distance quantitative active sand supply device. Moreover, the arc-shaped structure of the cutter head of the pipe jacking machine makes the abrasive supply pipeline relatively long. In the current application process of the abrasive water jet, abrasive particles are mostly adsorbed by negative pressure. Limited by the space of the pipe jacking machine, the size of the rotation center mounted on the pipe jacking machine is small, and the problem of insufficient negative pressure is likely to occur during use, and the problem of water return is likely to occur.

[0007] (3) In terms of the design of the abrasive water jet cutter head: when the pipe jacking machine cuts the arc-shaped segment during the entry and exit of the tunnel, the flat cutter head cannot fit the segment correctly, which is likely to cause the instability of the segment and the cutter head; the installation of the water jet, the selection of nozzles and the protection of the water jet are still not clear.

[0008] (4) In terms of the abrasive water jet-assisted cutting construction process: there is a lack of cutting processes and strategies for different target bodies. For example, when cutting reinforced / fiberglass-reinforced concrete segments, the material cutting is difficult, while the rock is relatively easy. If efficient cutting is required, targeted process technologies and parameter selections are needed. Summary of the Invention

[0009] To solve the technical problems existing in the above-mentioned background art, the present invention provides an active abrasive supply type abrasive water jet pipe jacking machine device and its method, which can reduce the damage caused by excessive thrust, improve the excavation efficiency, and greatly increase the applicability of the pipe jacking machine.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] The first aspect of the present invention provides an active abrasive supply type abrasive water jet pipe jacking machine device.

[0012] An active abrasive supply type abrasive water jet pipe jacking machine device includes:

[0013] A rotary center, an active abrasive supply system, a degassing mechanism, a cutter head, and a control system;

[0014] The rotary center is arranged at the rear end of the cutter head and is used for dynamically and statically separating the high-pressure water, abrasive, and high-pressure gas transmitted to the cutter head; a central cutter set is installed on the cutter head.

[0015] The pneumatic conveying device is arranged between the rotary center and the cutter head, and the active abrasive supply system is connected to the control system; the active abrasive supply system includes a sand box and an abrasive supply pipe. One end of the abrasive supply pipe is connected to the sand box, and the other end passes through the rotary center, passes through the degassing mechanism, and extends into the combined cutter to provide abrasive for the combined cutter.

[0016] The degassing mechanism is arranged on the cutter head; the degassing mechanism adopts a bearing form and rotates relative to the cutter head inside; the degassing mechanism is used to discharge the gas in the abrasive supply pipeline.

[0017] As an implementation manner, the control system is also connected to a high-pressure water conveying mechanism, and the high-pressure water conveying mechanism includes a high-pressure pump group, a water tank pump, a high-pressure water joint, and a high-pressure water distributor;

[0018] The high-pressure pump group pumps high-pressure water from the water tank pump to the high-pressure water joint at the rear end of the rotary center, passes through the high-pressure water joint into the rotary center, and outputs from the front end of the rotary center to connect to the high-pressure water distributor, and is one-to-one connected to the water jet nozzles of the combined cutter.

[0019] As an implementation manner, a plurality of sand storage rings are arranged inside the rotary center, and one sand storage ring outputs one path of abrasive outward to achieve the goal of transporting multiple paths of abrasive towards the cutter head direction.

[0020] As an implementation manner, a number of air storage rings are arranged inside the rotation center. Each air storage ring is used to introduce a path of high-pressure gas. After each path of high-pressure gas exits the rotation center, it is connected to a pneumatic conveying device, so that the pneumatic conveying device forms a high-pressure area and a low-pressure area, thereby realizing the one-way transportation of abrasives.

[0021] As an implementation manner, exhaust holes are opened in the upper part of the degassing mechanism, so that the gas is discharged from the upper part.

[0022] As an implementation manner, a one-way air guiding film is attached to the inner side of the exhaust hole to prevent external gas from being sucked back into the pipeline.

[0023] As an implementation manner, the arcs of the cutter head and the central cutter set are both consistent with the inner and outer arcs of the segment.

[0024] As an implementation manner, the depth of abrasive water jet cutting of reinforced concrete is determined according to the water jet cutting depth prediction model. The water jet cutting depth prediction model is a relationship model between the cutting seam depth and the transverse movement speed of the nozzle, the target distance, the pump pressure, and the nozzle diameter.

[0025] As an implementation manner, the water jet cutting depth prediction model is obtained by fitting the results of cutting reinforced concrete in the laboratory.

[0026] The second aspect of the present invention provides a working method of an active sand supply type abrasive water jet pipe jacking machine device.

[0027] A working method of an active sand supply type abrasive water jet pipe jacking machine device includes:

[0028] High-pressure gas, high-pressure water, and abrasives are respectively sent to the rear end of the rotation center through corresponding pipelines. After that, they are extruded from different positions of the rotation center and transmitted to the front end, realizing the change from static to rotating;

[0029] After the abrasives extruded from the rotation center are degassed, they enter the nozzle in the combined cutter under negative pressure conditions and are mixed with high-pressure water to form a high-pressure water jet;

[0030] The high-pressure abrasive water jet first pre-cuts the front segment, and then the mechanical cutter penetrates and breaks the target body, and the tunneling work is completed.

[0031] The beneficial effects of the present invention are:

[0032] (1) For the active sand supply type abrasive water jet pipe jacking machine device of the present invention, by using the combined tunneling of abrasive water jet and pipe jacking machine, the pre-cutting ability of abrasive water jet and the cutting ability of mechanical cutters can be fully utilized. The arc-shaped design of the cutter head and the central cutter set structure can reduce the disturbance during the excavation of the segment, reduce the damage caused by excessive thrust, improve the excavation efficiency, and greatly increase the applicability of the pipe jacking machine.

[0033] (2) The present invention realizes the dynamic and static separation of abrasive particles, high-pressure water, and high-pressure gas by means of the rotation center, solving the contradiction between the motion state of the front cutter head and the static state of the rear supply system. The active abrasive supply device solves the drawback that the traditional high-pressure water jet device only relies on negative pressure to suck in abrasives, and can solve the problems such as the reverse flow of the abrasive pipeline, difficult cleaning of the abrasive pipeline, complex operation, and high time cost when the high-pressure abrasive water jet is used, such as when opening and closing high-pressure equipment and the size matching of the abrasive-sand pipe is not ideal. In addition, due to the large difference in the nozzle linear velocity caused by the different nozzle arrangement positions, the prediction formula can provide a basis for predicting the cut depth according to the construction parameters in actual engineering, improving the continuous tunneling efficiency.

[0034] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0036] Figure 1 is a schematic structural diagram of the active abrasive supply type abrasive water jet pipe jacking machine device according to an embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of the cutter head according to an embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of the principle of active abrasive supply according to an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of the rotation center according to an embodiment of the present invention;

[0040] Figure 5 is a schematic structural diagram of the degassing mechanism according to an embodiment of the present invention;

[0041] Figure 6 is a schematic structural diagram of the pneumatic conveying device according to an embodiment of the present invention.

[0042] Wherein: 1 control system, 2 air pump, 3 sand box, 4 pneumatic conveying device, 401 air pump source access, 402 abrasive pipeline, 403 second high-pressure air pipeline, 5 control valve, 6 rotary center, 601 sand storage ring, 602 high-pressure air inlet, 603 other material inlets; 7 degassing mechanism, 701 second abrasive pipeline, 702 exhaust hole, 704 first abrasive pipeline, 705 roller, 706 internal component, 8 cutter head, 801 shell cutter, 802 central cutter set, 9 combined cutter, 10 hob, 11 water tank pump, 1101 first high-pressure water pipeline, 201 first high-pressure air pipeline, 1102 high-pressure water joint, 1103 second high-pressure water pipeline. Detailed implementation mode

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific implementation modes and are not intended to limit the exemplary implementation modes according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] In one or more embodiments, as Figure 1 shown, a kind of active sand supply type abrasive water jet pipe jacking machine device is provided, which includes: rotary center 6, active sand supply system, degassing mechanism 7, cutter head (such as arc cutter head), central cutter set 802 and control system 1. Among them, the rotary center 6 is arranged at the rear end of the cutter head and is used for dynamically and statically separating the high-pressure water, abrasive and high-pressure gas transmitted to the cutter head. The central cutter set 802 is installed on the cutter head. The position of the central cutter set 802 is at the center of the cutter head, and the central cutter set 802 includes combined cutter 9 and shell cutter 801. Specifically, in accordance with the principle of densely arranging combined cutters towards the center and loosely arranging combined cutters outward, the combined cutters and mechanical cutters are arranged in a saddle-shaped arc. A hob 10 is also installed on the central cutter set 802.

[0047] In some other embodiments, the control system 1 is also connected to a high-pressure water delivery mechanism, and the high-pressure water delivery mechanism includes a high-pressure pump group, water tank pump 11, high-pressure water joint 1102 and high-pressure water flow divider;

[0048] The high-pressure pump group pumps high-pressure water from the water tank pump 11 through the first high-pressure water pipeline 1101 to the high-pressure water joint 1102 at the rear end of the slewing center 6. The high-pressure water is introduced into the slewing center 6 through the high-pressure water joint 1102 and output from the front end of the slewing center 6 to connect to the high-pressure water flow divider. The high-pressure water flow divider is connected to the second high-pressure water pipeline 1103 and leads to the water jet nozzles of the combined cutter 9 one by one.

[0049] Among them, the slewing center is the hub connecting the cutter head and the static components at the rear end of the pipe jacking machine (such as slewing joints, high-pressure pipelines, sand tanks, etc.).

[0050] As Figure 4 shown, a number of sand storage rings 601 are arranged inside the slewing center 6. One sand storage ring 601 outputs one path of abrasive outward to achieve the goal of transporting multiple paths of abrasive towards the cutter head direction.

[0051] A number of air storage rings are arranged inside the slewing center 6. Each air storage ring is used to connect with the high-pressure air inlet 602. Among them, each path of high-pressure air is connected to a pneumatic conveying device 4 after leaving the slewing center, so that the pneumatic conveying device 4 forms a high-pressure area and a low-pressure area, thereby realizing the one-way transportation of abrasive. As Figure 6 shown, the input end of the pneumatic conveying device 4 is connected to the air pump source access 401, and the output end of the pneumatic conveying device 4 is respectively connected to the abrasive pipeline 402 and the second high-pressure air pipeline 403. The other end of the second high-pressure air pipeline 403 is connected to the first high-pressure air pipeline 201. An inlet for other materials such as foam is arranged inside the slewing center 6.

[0052] In some specific implementation processes, the shapes of the cutter head and the central cutter set are both specially processed into an anti-arc shape according to the actual working requirements to adapt to the actual engineering conditions and improve the tunneling stability. Among them, the arcs of the cutter head and the central cutter set are both consistent with the arcs on the inner and outer sides of the segment. As Figure 2 shown, among them, the central cutter set 802 includes shell cutters / scarifiers and the combined cutter 9. The water jet is built into the mechanical cutter to form the combined cutter 9.

[0053] According to Figure 3 , the pneumatic conveying device is arranged between the slewing center 6 and the cutter head 8, and the pneumatic conveying device is connected to the control system; the active sand supply system includes a sand box 3 and an abrasive supply pipe. One end of the abrasive supply pipe is connected to the sand box 3, and the other end passes through the slewing center 6 and extends into the combined cutter 9 to provide abrasive for the combined cutter 9.

[0054] Among them, the control system can adjust the air pressure and the abrasive flow rate respectively by adjusting the opening degrees of valve A and valve B, thereby realizing the precise control of the abrasive flow rate.

[0055] As Figure 5As shown, the degassing mechanism 7 is arranged between the rotation center 6 and the combined tool 9. The degassing mechanism 7 is in the form of a bearing and rotates relative to the cutter head inside. The degassing mechanism 7 is used to discharge the gas in the abrasive supply pipeline.

[0056] Among them, the degassing mechanism 7 is also connected to the second abrasive pipeline 701 and the first abrasive pipeline 704. Among them, the second abrasive pipeline 701 is the sand inlet pipeline, and the first abrasive pipeline 704 is the sand outlet pipeline. A roller 705 and an internal component 706 are arranged inside the degassing mechanism 7 to achieve the form of a bearing.

[0057] An exhaust hole 702 is opened at the upper part of the degassing mechanism 7 to discharge the gas from the upper part. A one-way air guiding film is attached to the inner side of the exhaust hole to prevent the external gas from being sucked back into the pipeline. This degassing mechanism is used to discharge the gas in the abrasive supply pipeline and reduce the influence of the gas on the stability of the abrasive water jet. The principle of the degassing mechanism is: using the density difference between the gas and the abrasive particles, the abrasive is deposited at the bottom of the degassing mechanism, and the gas is discharged at the upper air holes. The degassing mechanism adopts the same form as the bearing, and the inside can rotate relative to the cutter head, always keeping the abrasive deposited at the lower part. A abrasive transport hose (i.e., Figure 1 the abrasive pipe (out) in

[0058] Among them, the active sand supply system is connected to the rotation center and the combined tool, sucks in the abrasive transmitted from the rotation center to the rear end of the cutter head and accelerates it, and transmits it to the nozzle at the front end of the cutter head through the abrasive supply pipeline.

[0059] In this embodiment, the cutting depth of the abrasive water jet for reinforced concrete is determined according to the water jet cutting depth prediction model. The water jet cutting depth prediction model is a relationship model between the cutting seam depth and the transverse movement speed of the nozzle, the target distance, the pump pressure, and the nozzle diameter.

[0060] Among them, the water jet cutting depth prediction model is obtained by fitting the results of cutting reinforced concrete in the laboratory. The water jet cutting depth prediction model can provide a prediction basis for the cutting depth of the reinforced concrete structure during actual tunneling, and avoid relying on empirical judgment of the cutting depth, resulting in construction safety problems.

[0061] For example: The formula of the water jet cutting depth prediction model is:

[0062] D j =a*v b *h c *P d *d e (1)

[0063] In the formula, D jD is the cutting slot depth, with the unit of mm; v is the transverse movement speed of the nozzle, with the unit of m / min; h is the target distance, with the unit of mm; P is the pump pressure, with the unit of MPa; d is the nozzle diameter, with the unit of mm; where a, b, c, d, and e are all fitting parameters.

[0064] For example, a is 0.112, b is -0.988, c is -0.435, d is 0.725, and e is 1.351.

[0065] The formula for the water jet cutting depth prediction model is: D j = 0.112v -0.988 h -0.435 P 0.725 d 1.351 .

[0066] The formula (1) contains parameters such as the transverse movement speed and the pump pressure. According to the sensitivity of the cutting slot depth to different parameters, they are sorted in order from left to right. During the use process, the specific values of each variable can be determined in order from left to right according to the actual working conditions.

[0067] Moreover, when cutting extremely hard materials such as reinforced concrete, asynchronous cutting is selected, that is, first use the water jet to cut the steel bar to > 1 / 2 of the steel bar diameter, and then use the mechanical knife to cut; when cutting materials such as rock, synchronous cutting technology is selected to improve the cutting rock efficiency.

[0068] To prevent the accident of steel bars winding around the auger during the working process, the layout basis of the abrasive water jet assisted pipe jacking machine cutter head is proposed: the length of the cut steel bar is less than the diameter of the auger. Under this principle, the number and position of the water knives are arranged. Specifically, the whole cutter head is set as an outward convex arc and fits with the concave segment lining when entering the hole; the center cutter area is set as an inward concave arc and fits with the convex segment lining when leaving the hole; the maximum length of the water knife cutting the steel bar / fiberglass bar is less than 2 times the diameter of the auger, and the combined cutters are symmetrically arranged on the central cutter set; determine the layout basis of the water knife according to the principle of consistent cutting depth of the inner and outer sides of the cutter head, and select the nozzle diameter based on the water jet cutting depth prediction formula; place the water knife inside the cutting knife, and the cutting knife should be as close to the face as possible while preventing...

[0069] To ensure efficient and energy-saving guidance for the cutter head design, a design formula is proposed for optimizing the water nozzle diameter and pump pressure of each combined cutter. In principle, the high-pressure pump group is selected according to the flow rate, which can not only give full play to the power of the high-pressure pump but also save the procurement cost, and then calculate in combination with the nozzle diameter.

[0070] Common parameters such as the water nozzle diameter, pump pressure, and required flow rate are selected according to formula (2).

[0071]

[0072] where d is the nozzle diameter (m), Q is the flow rate (m 3 / s), is the reduction coefficient of 0.98, p is the pump pressure (Pa), and ρ is the density of water (1000 kg / m 3 ).

[0073] In some other embodiments, a working method of an active abrasive supply type abrasive water jet pipe jacking machine device is further provided, including:

[0074] High-pressure gas, high-pressure water, and abrasive are respectively sent to the rear end of the rotary center through corresponding pipelines, and then are extruded from different positions of the rotary center and transmitted to the front end to realize the change from static to rotating;

[0075] After the abrasive extruded from the rotary center is degassed, it enters the nozzle in the combined cutter under negative pressure conditions and forms a high-pressure water jet after being mixed with high-pressure water;

[0076] The high-pressure abrasive water jet first pre-cuts the front segment, and then the combined cutter penetrates, and the tunneling work is completed.

[0077] In this embodiment, the degassing mechanism is arranged on the cutter head to remove the gas carried by the abrasive and improve the effective target distance of the water jet.

[0078] The high-pressure water transportation method is as follows: The high-pressure pump group pumps high-pressure water from the water tank to the high-pressure water joint at the rear end of the rotary center, passes through the joint into the rotary center, and outputs from the front end to connect to the water jet nozzles of the combined cutter one by one through the high-pressure water distributor.

[0079] The abrasive transportation method is as follows: The sand box transports the abrasive to the rotary center through the commonly used strong pressure technology at present; the abrasive enters the sand storage ring inside the rotary center, and one sand storage ring outputs one path of abrasive outward, and finally realizes the goal of transporting multiple paths of abrasive towards the cutter head; after leaving the rotary center, each path of abrasive is powered by a pneumatic conveying device and flows towards the degassing mechanism on the cutter head; the abrasive deposits under the degassing device mechanism and the gas is discharged from the exhaust hole; finally, under the action of the negative pressure formed by the high-pressure water jet, the abrasive flows towards the water nozzle through the sand outlet at the lower part of the degassing mechanism and forms an abrasive water jet in the mixing chamber of the water nozzle. Among them, the pneumatic conveying device is connected to the high-pressure gas pipeline, and there is a low-pressure area and a high-pressure area inside it when high-pressure gas is introduced.

[0080] The high-pressure gas is as follows: The high-pressure gas is transported from the air pump to the rotary center, and one-to-one output is realized through the air storage ring of the rotary center. When multiple paths are connected to different air storage rings, multiple paths in and multiple paths out can be realized. Each path of high-pressure gas is connected to the pneumatic conveying device after leaving the rotary center, so that the pneumatic conveying device forms a high-pressure area and a low-pressure area, and then realizes the unidirectional transportation of the abrasive.

[0081] In this embodiment, based on the structures and working properties of the roadheader and the water jet system, it is proposed that the high-pressure pump unit be placed on a trailer (workbench truck). The high-pressure water outlet of the pump unit is connected to a high-pressure hose, which is connected to a high-pressure water rotary joint through a pressure gauge. After the high-pressure water passes through the multi-medium high-pressure rotary center, it is connected to a diverter. After dividing into multiple water jets, it is then connected to an abrasive water jet arc cutter head and shoots towards the target through the water jet cutter head. The entire water jet control system is integrated into the control room of the roadheader to sense and control the system parameters.

[0082] Specifically, the working process of the active sand supply type abrasive water jet pipe jacking machine device is as follows:

[0083] First, design the shape parameters of the cutter head and the combined cutter according to the actual engineering conditions to make them adapt to the actual excavation engineering conditions. During operation, the high-pressure gas generated by the air pump, the high-pressure water generated by the high-pressure water pump, and the abrasive particles pumped out from the abrasive tank are respectively pumped to the rear end of the rotary center through a mutually connected air delivery hose, high-pressure water pipe, and abrasive delivery pipeline. During the construction process, the outside of the rotary center is in a static state. The rear end of the rotary center is respectively provided with a high-pressure gas path, a high-pressure water path, a low-pressure gas path, and an abrasive path. These pipelines are respectively connected to another mutually connected air delivery pipe, high-pressure water pipe, and abrasive delivery pipeline. After the gas, high-pressure water, and abrasive particles enter the rotary center, they enter the annular chamber and are extruded from different positions to achieve multi-channel output, which are respectively transmitted to the front end to realize the change from static to rotating.

[0084] The high-pressure water path at the front end of the rotary center is directly connected to the nozzle, and the low-pressure gas path is connected to the high-pressure water jet nozzle switch valve. The high-pressure gas path is connected to the active sand supply device. After the abrasive particles entering the rotary center are discharged through the front abrasive path, they first enter the active sand supply device. After being accelerated in the active sand supply pipeline, they enter the degassing mechanism for degassing, and finally enter the nozzle in the combined cutter under negative pressure conditions and mix with the high-pressure water to form a high-pressure water jet. Due to the presence of high-pressure gas, it can prevent the backwater phenomenon caused during the switching process of the high-pressure water jet system and avoid the shutdown and maintenance work caused by the blockage of the abrasive pipeline after it gets wet. After the above steps are completed, the high-pressure abrasive water jet first pre-cuts the front segment, and then the cutter penetrates, and the tunneling work is completed.

[0085] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An active sand supply abrasive water jet pipe jacking machine device, characterized in that: include: Rotation center, active sand supply system, degassing mechanism, cutter head and control system; The rotation center is arranged at the rear end of the cutter disc, and is used for dynamic and static separation of high-pressure water, abrasive and high-pressure gas transmitted to the cutter disc; a combined cutter is installed on the cutter disc; A plurality of gas storage rings are arranged inside the rotary center, each gas storage ring is used to introduce a high-pressure gas, and each high-pressure gas is connected to a pneumatic conveying device after leaving the rotary center, so that the pneumatic conveying device forms a high-pressure area and a low-pressure area, thereby realizing one-way transportation of abrasives; The pneumatic conveying device is arranged between the rotation center and the cutter disc, and the active sand supply system is connected to the control system; the active sand supply system includes a sand box and an abrasive supply pipe, one end of the abrasive supply pipe is connected to the sand box, and the other end passes through the rotation center, passes through the degassing mechanism and extends into the combined tool to provide abrasive for the combined tool; The degassing mechanism is arranged between the rotation center and the combined cutter; the degassing mechanism is in the form of a bearing, and its interior rotates relative to the cutter disc; the degassing mechanism is used to discharge the gas in the abrasive supply pipeline; The active sand supply system is connected to the rotary center and the combined cutter, sucks in and accelerates the abrasive transmitted from the rotary center to the rear end of the cutter disc, and transmits it to the nozzle at the front end of the cutter disc through the abrasive supply pipeline.

2. The active sand supply abrasive water jet pipe jacking machine device according to claim 1, characterized in that: The control system is also connected to a high-pressure water delivery mechanism, which includes a high-pressure pump group, a water tank pump, a high-pressure water joint and a high-pressure water divider; The high-pressure pump group pumps high-pressure water from the water tank to the high-pressure water joint at the rear end of the rotating center, passes into the rotating center through the high-pressure water joint, outputs from the front end of the rotating center to connect the high-pressure water manifold, and leads one-to-one to the water jet nozzle of the combined tool.

3. The active sand supply abrasive water jet pipe jacking machine device according to claim 1, characterized in that: A plurality of sand storage rings are arranged inside the rotary center, and one sand storage ring outputs one path of abrasive outwards correspondingly, so as to realize the goal of conveying multiple paths of abrasive toward the cutter disc.

4. The active sand supply abrasive water jet pipe jacking machine device according to claim 1, characterized in that: An exhaust hole is opened on the upper part of the degassing mechanism so that the gas is discharged from the upper part.

5. The active sand supply abrasive water jet pipe jacking machine device according to claim 4, characterized in that: A one-way air guide film is attached to the inner side of the exhaust hole to prevent external air from being sucked back into the pipeline.

6. The active sand supply abrasive water jet pipe jacking machine device according to claim 1, characterized in that: The curvature of the cutter disc and the central cutter set is consistent with the curvature of the inner and outer sides of the pipe segment.

7. The active sand supply abrasive water jet pipe jacking machine device according to claim 1, characterized in that: The cutting depth of reinforced concrete by abrasive water jet is determined according to a water jet cutting depth prediction model, which is a relationship model between the cutting depth and the traverse speed of the nozzle, the target distance, the pump pressure and the nozzle diameter.

8. The active sand supply abrasive water jet pipe jacking machine device according to claim 7, characterized in that: The water jet cutting depth prediction model is obtained by fitting based on laboratory cutting results of reinforced concrete.

9. A working method of an active sand supply abrasive water jet pipe jacking machine device as claimed in any one of claims 1 to 8, characterized in that: include: High-pressure gas, high-pressure water and abrasive are sent to the rear end of the rotation center through corresponding pipelines, and then squeezed out from different positions of the rotation center and transmitted to the front end to achieve the change from static to rotating; The abrasive extruded from the rotating center is degassed and then enters the nozzle in the combined tool under negative pressure and mixes with high-pressure water to form a high-pressure water jet; The high-pressure abrasive water jet first pre-cuts the front segment, and then the mechanical tool penetrates into the crushed target, completing the excavation work.

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