Multi-angle Cement-soil Pile Construction System in Subway Tunnels

Abstract

The present invention discloses a multi-angle cement-soil pile construction system in a subway tunnel, aiming to provide a multi-angle cement-soil pile construction system in a subway tunnel that can not only effectively improve the construction efficiency of tunnel reinforcement, but also support the tunnel at multiple angles and has good tunnel reinforcement effect. It includes a walking vehicle, and an installation platform is provided on the walking vehicle; a pile construction unit, the pile construction unit includes two high-pressure jet grouting machines arranged on the installation platform for constructing inclined piles, wherein the jet grouting drill pipe of one high-pressure jet grouting machine for constructing inclined piles inclines to the left side of the installation platform; the jet grouting drill pipe of the other high-pressure jet grouting machine for constructing inclined piles inclines to the right side of the installation platform; a cement supply device, the cement supply device includes a cement feeding pump and a cement mixer arranged on the installation platform, the cement mixer is used for mixing cement, and the cement feeding pump supplies the cement mixed by the cement mixer to the high-pressure jet grouting machine through a feeding pipeline.

Description

Technical Field

[0001] The present invention relates to a construction equipment for cement-soil piles in a subway tunnel, and particularly to a multi-angle cement-soil pile construction system in a subway tunnel for tunnel reinforcement. Background Art

[0002] At present, after the construction of a tunnel (such as a subway tunnel), it is necessary to reinforce the entire tunnel or a certain section of the tunnel to improve the structural stability of the tunnel; however, the current tunnel reinforcement construction equipment and construction methods are not technically mature, and there are problems such as complex construction steps, low construction efficiency, and poor reinforcement effect of the tunnel reinforcement structure completed by construction. In view of this, it is of great significance to develop a tunnel reinforcement construction equipment to improve the construction efficiency and tunnel reinforcement effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-angle cement-soil pile construction system in a subway tunnel that can not only effectively improve the tunnel reinforcement construction efficiency, but also support the tunnel at multiple angles and has a good tunnel reinforcement effect.

[0004] The technical solution of the present invention is as follows:

[0005] A multi-angle cement-soil pile construction system in a subway tunnel, comprising:

[0006] A traveling vehicle, which can travel in a subway tunnel. An installation platform is provided on the traveling vehicle. The traveling vehicle is a crawler-type traveling vehicle or a wheel-type traveling vehicle or a track traveling vehicle suitable for traveling on rails;

[0007] A pile machine group, which includes two high-pressure jet grouting machines for constructing inclined piles arranged on the installation platform. The jet grouting drill rod of one high-pressure jet grouting machine for constructing inclined piles inclines to the left side of the installation platform, and the inclination angle of the jet grouting drill rod is 0-90 degrees; the jet grouting drill rod of the other high-pressure jet grouting machine for constructing inclined piles inclines to the right side of the installation platform, and the inclination angle of the jet grouting drill rod is 0-90 degrees; the jet grouting drill rod includes a drill body, and the drill body is composed of a plurality of connecting drill pipes connected in sequence;

[0008] A cement supply device, which includes a cement feeding pump and a cement stirrer arranged on the installation platform. The cement stirrer is used for stirring cement, and the cement feeding pump supplies the cement stirred by the cement stirrer to the high-pressure jet grouting machine through a feeding pipeline.

[0009] The multi-angle soil-cement pile construction system in the subway tunnel of this solution moves directly in the subway tunnel through a walking vehicle, and two high-pressure jet grouting rigs for constructing inclined piles simultaneously construct high-pressure jet grouting piles with an inclined distribution under the tunnel. Specifically, one high-pressure jet grouting rig with a jet grouting drill rod inclined to the left of the installation platform constructs a left-inclined high-pressure jet grouting pile in the lower left of the tunnel, and one high-pressure jet grouting rig with a jet grouting drill rod inclined to the right of the installation platform constructs a right-inclined high-pressure jet grouting pile in the lower right of the tunnel. Thus, the tunnel is reliably supported and reinforced at multiple angles through the right-inclined and left-inclined high-pressure jet grouting piles, and the tunnel reinforcement effect is good. On the other hand, compared with the existing high-pressure jet grouting rig that can only construct one high-pressure jet grouting pile at a time, this solution uses two high-pressure jet grouting rigs for constructing inclined piles to simultaneously construct two high-pressure jet grouting piles with an inclined distribution under the tunnel, which can effectively improve the construction efficiency of tunnel reinforcement.

[0010] Preferably, the rig includes a vehicle frame installed on the installation platform, a support tower rod arranged on the vehicle frame, a first guide rail arranged on the support tower rod, a sliding seat sliding along the first guide rail, a sliding seat moving actuator for driving the sliding seat, and a rotary power head arranged on the sliding seat. The jet grouting drill rod further includes a drill rod head arranged at the lower end of the drill body and a drill rod tail arranged at the upper end of the drill body. The drill rod tail includes a tail drill pipe rotatably arranged on the sliding seat, a rotating connection head rotatably connected to the upper end of the tail drill pipe, and a cement grouting port arranged on the rotating connection head. The rotary power head is used to drive the rotation of the tail drill pipe. A drill bit is arranged at the lower end of the drill rod head, and high-pressure jet grouting holes are arranged at the lower part of the side wall of the drill rod head. One end of the connecting drill pipe is provided with a polygonal insertion hole, the other end of the connecting drill pipe is provided with a polygonal insertion pipe, radial bolt holes communicating with the polygonal insertion hole and locking bolts cooperating with the radial bolt holes are arranged on the outer side surface of the connecting drill pipe. Among any two adjacent connecting drill pipes, the polygonal insertion pipe of one connecting drill pipe is inserted into the polygonal insertion hole of the other connecting drill pipe, and the lower end of the tail drill pipe is also provided with a polygonal insertion pipe for cooperating with the polygonal insertion hole. Since a drill bit is arranged at the bottom of the jet grouting drill rod, the high-pressure jet grouting rig can directly use the jet grouting drill rod to drill holes, thereby driving the high-pressure jet grouting holes into the set depth; then directly use the jet grouting drill rod for high-pressure jet grouting to form a high-pressure jet grouting pile, thus combining the two processes of pilot hole drilling and high-pressure jet grouting in the MJS method into one, realizing the integrated operation of pilot hole drilling and high-pressure jet grouting, and improving the construction efficiency.

[0011] Preferably, the high-pressure jet grouting rig further includes a centrifugal locking device. Radial mounting holes are provided on the outer sides of the polygonal insertion pipes of each connecting drill pipe and the polygonal insertion pipe at the lower end of the tail drill pipe. The centrifugal locking device corresponds to the radial mounting holes one by one. The centrifugal locking device includes a radial sliding sleeve disposed in the corresponding radial mounting hole and a radial locking rod slidably disposed in the radial sliding sleeve. The inner end of the radial sliding sleeve is closed, and a tension spring is connected between the inner end of the radial locking rod and the inner end of the radial sliding sleeve. Annular clamping grooves for cooperating with the radial locking rods are provided on the inner side walls of the polygonal insertion holes of each connecting drill pipe;

[0012] After the polygonal insertion pipe is inserted into the polygonal insertion hole, the radial locking rod on the polygonal insertion pipe faces the annular clamping groove in the corresponding polygonal insertion hole; when the rotation speed of the jet grouting drill rod exceeds the set value, the radial locking rod on the jet grouting drill rod will overcome the tension of the tension spring under the action of centrifugal force, slide outwards along the radial sliding sleeve, and insert the outer end of the radial locking rod into the corresponding annular clamping groove.

[0013] In the prior art, after the jet grouting drill rod drills into the specified depth each time, the sliding seat moving actuator drives the sliding seat, the rotary power head and the drill rod tail to move up a set distance along the first guide rail. Then, the operator installs another connecting drill pipe on the jet grouting drill rod. Then, the sliding seat moving actuator drives the sliding seat, the rotary power head and the drill rod tail to move down a set distance along the first guide rail, so that the polygonal insertion pipe at the lower end of the tail drill pipe is inserted into the polygonal insertion hole at the upper end of the connecting drill pipe; then, the operator tightens the locking bolt to connect two adjacent connecting drill pipes; however, in actual construction, there are problems such as the operator not tightening the locking bolt properly, or not tightening it enough, or the thread of the locking bolt and / or the thread of the threaded hole cooperating with the locking bolt being damaged, or the locking bolt becoming loose due to vibration, resulting in the unreliable connection of two adjacent connecting drill pipes. As a result, during the process of the sliding seat moving actuator driving the sliding seat and the jet grouting drill rod to move up along the first guide rail, the connecting drill pipes connected somewhere in the jet grouting drill rod drilled into the soil layer become disconnected, causing a construction failure of the high-pressure jet grouting pile, and a part of the jet grouting drill rod falls off in the soil layer. To solve the above problems, the present solution provides a centrifugal locking device. Specifically,

[0014] During the construction of high-pressure jet grouting piles with a jet grouting drill pipe, the jet grouting drill pipe is in a high-speed rotating state. At this time, the radial locking rod will be inserted into the corresponding annular card slot under the action of centrifugal force. In this way, while the jet grouting drill pipe rotates, it generally moves back. During the construction of high-pressure jet grouting piles in the soil layer, even if the locking bolts connecting two connecting drill pipes are not tightened, these two connecting drill pipes will not come apart under the combined action of the radial locking rod and the annular card slot, thus effectively solving the above problems. On the other hand, since the polygonal insertion pipe at the lower end of the tail drill pipe is also provided with a centrifugal locking device, during the construction of high-pressure jet grouting piles with the jet grouting drill pipe, the radial locking rod on the polygonal insertion pipe at the lower end of the tail drill pipe will be inserted into the corresponding annular card slot under the action of centrifugal force. In this way, the operator does not need to tighten the locking bolt on a connecting drill pipe adjacent to the tail drill pipe, and the operation of connecting the tail drill pipe and the connecting drill pipe by tightening the locking bolt can be omitted, which can further simplify the operation steps of manually tightening the locking bolt. During the process of the jet grouting drill pipe of the high-pressure jet grouting machine drilling into the soil layer, and during the process of the jet grouting drill pipe of the high-pressure jet grouting machine moving back after drilling to the set depth in the soil layer, the operator only needs to tighten the locking bolt to connect two adjacent connecting drill pipes, and the operation of connecting the tail drill pipe and the connecting drill pipe by tightening the locking bolt can be omitted.

[0015] Preferably, the radial sliding sleeve and the radial mounting hole are connected by threads. In this way, it is convenient for the installation and disassembly of the radial sliding sleeve.

[0016] Preferably, a limiting chute extending along the axial direction of the radial sliding sleeve is provided on the inner wall of the radial sliding sleeve, and a sliding block cooperating with the limiting chute is provided on the outer side surface of the radial locking rod.

[0017] Preferably, a drill pipe installation device is further provided on the installation platform between two high-pressure jet grouting rigs for constructing inclined piles. The drill pipe installation device includes a drill pipe placement rack and a manipulator arranged on the installation platform. The drill pipe placement rack is used to place the connecting drill pipes of the jet grouting drill rods, and the manipulator is used to carry and install the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rods of the high-pressure jet grouting rig for constructing inclined piles, or to remove the connecting drill pipes from the jet grouting drill rods of the high-pressure jet grouting rig for constructing inclined piles and place them on the drill pipe placement rack. In this way, during the process of the jet grouting drill rod of the high-pressure jet grouting rig drilling into the soil layer, after the jet grouting drill rod drills into the specified depth each time, the manipulator can carry and install the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting rig; after the jet grouting drill rod of the high-pressure jet grouting rig drills into the set depth of the soil layer and moves back, after the jet grouting drill rod moves back a specified length each time, the manipulator can remove the connecting drill pipes from the jet grouting drill rod of the high-pressure jet grouting rig and place them on the drill pipe placement rack; thus, during the construction of high-pressure jet grouting piles, there is no need for manual handling to install or disassemble the connecting drill pipes of the jet grouting drill rod, so as to reduce manual operation, lower labor intensity, and improve the construction efficiency of tunnel reinforcement.

[0018] Preferably, the drill pipe placement rack includes a bottom rack arranged on the installation platform, a rotating bracket rotatably arranged on the bottom rack through a vertical shaft rod, and a rotation driving device for driving the rotating bracket to rotate around the vertical shaft rod. A plurality of vertically inserted holes are circumferentially and evenly distributed around the vertical shaft rod on the rotating bracket, and the vertically inserted holes are used to insert the connecting drill pipes of the jet grouting drill rods.

[0019] Preferably, the high-pressure jet grouting pile machine further includes a tail drill pipe separation anti-rotation alignment device. The sliding seat includes a first sliding seat slidably arranged on the first guide rail, a second guide rail arranged on the first sliding seat and parallel to the first guide rail, an upper limit block and a lower limit block of the sliding seat arranged on the first sliding seat, and a second sliding seat slidably arranged on the second guide rail and located between the upper limit block and the lower limit block of the sliding seat. The sliding seat movement actuator is used to drive the first sliding seat to move along the first guide rail. The tail drill pipe separation anti-rotation alignment device includes a torsion spring, a fixed sleeve fixedly arranged at the lower part of the tail drill pipe, a plurality of axial locking grooves circumferentially and evenly distributed on the lower outer side of the fixed sleeve, a locking sleeve sleeved on the lower part of the tail drill pipe, a connecting piece connecting the locking sleeve and the first sliding seat, a locking plate receiving groove arranged on the inner wall of the locking sleeve, a locking plate for cooperating with the axial locking groove, and a locking plate limiting member arranged in the locking plate receiving groove. The outer side of the fixed sleeve, the locking sleeve and the rotation axis of the tail drill pipe are coaxially distributed. The axial locking groove extends along the rotation axis direction of the tail drill pipe, and the lower end of the axial locking groove communicates with the lower end surface of the fixed sleeve. The upper part of the locking plate is located in the locking plate receiving groove, and the upper part of the locking plate is rotatably arranged in the locking plate receiving groove through a through shaft. The locking plate limiting member is located outside the locking plate. The torsion spring is used to drive the lower part of the locking plate to rotate towards the axis direction of the locking sleeve around the shaft. When the second sliding seat abuts against the lower limit block of the sliding seat, the locking sleeve is sleeved outside the fixed sleeve, the lower part of the locking plate abuts against the upper part of the outer side of the fixed sleeve under the action of the torsion spring, and the locking plate is located above the locking plate receiving groove. When the second sliding seat abuts against the upper limit block of the sliding seat, the fixed sleeve is located above the locking sleeve.

[0020] Preferably, the high-pressure jet grouting pile machine further includes a rotating seat rotatably arranged on the vehicle frame through a horizontal shaft and a rotating seat rotation actuator for driving the rotating seat to rotate. The support tower rod is fixed on the rotating seat. In this way, the inclination angle of the jet grouting drill rod can be adjusted to meet the construction requirements of high-pressure jet grouting piles with different inclination angles.

[0021] Preferably, the cement mixer includes an upper mixing barrel for mixing cement, a feeding pipe provided at the bottom of the upper mixing barrel, a first on-off valve provided on the feeding pipe, a cement slurry storage barrel located below the upper mixing barrel, and a discharge pipe provided at the bottom of the cement slurry storage barrel. The cement slurry storage barrel is used to receive the cement slurry discharged from the feeding pipe. The feeding pipeline includes a feeding input pipe connecting the inlet of the cement feeding pump and the discharge pipe, a feeding output pipe connected to the outlet of the cement feeding pump, and a plurality of branch pipelines. The branch pipelines correspond to the high-pressure jet grouting machines of the pile driving unit one by one. One end of the branch pipeline is connected to the feeding output pipe, and the other end of the branch pipeline is connected to the cement injection port of the corresponding high-pressure jet grouting machine. In this solution, the upper mixing barrel is used to mix cement, and the mixed cement slurry is output to the cement slurry storage barrel through the feeding pipe, and the cement slurry in the cement slurry storage barrel is supplied to the high-pressure jet grouting machine through the cement feeding pump and the feeding pipeline. In this way, through the continuous operation of the upper mixing barrel, every time a barrel of cement is mixed well in the upper mixing barrel, the mixed cement slurry in the upper mixing barrel can be output to the cement slurry storage barrel as needed to ensure that the cement slurry in the cement slurry storage barrel can meet the continuous operation needs of the high-pressure jet grouting machine.

[0022] Preferably, the pile driving unit further includes a high-pressure jet grouting machine for constructing vertical piles provided on the installation platform, and two high-pressure jet grouting machines for constructing inclined piles are located on the same side of the high-pressure jet grouting machine for constructing vertical piles. The jet grouting drill rod of the high-pressure jet grouting machine for constructing vertical piles is vertically distributed, and a vertical through hole is provided on the installation platform. The jet grouting drill rod of the high-pressure jet grouting machine for constructing vertical piles passes through the vertical through hole. The jet grouting drill rod includes a drill body, and the drill body is composed of a plurality of connecting drill pipes connected in sequence. In this way, vertical high-pressure jet grouting piles vertically distributed can be constructed under the tunnel by the high-pressure jet grouting machine for constructing vertical piles. It cooperates with the two high-pressure jet grouting machines for constructing inclined piles to simultaneously construct vertical high-pressure jet grouting piles and two inclined high-pressure jet grouting piles under the tunnel to provide reliable support and reinforcement for the tunnel from multiple angles, and the tunnel reinforcement effect is good.

[0023] Preferably, a drill pipe installation device is also provided on the installation platform on one side of the high-pressure jet grouting machine for constructing vertical piles. The drill pipe installation device includes a drill pipe placement rack and a manipulator provided on the installation platform. The drill pipe placement rack is used to place the connecting drill pipes of the jet grouting drill rod, and the manipulator is used to carry and install the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting machine for constructing vertical piles, or to remove the connecting drill pipes on the jet grouting drill rod of the high-pressure jet grouting machine for constructing vertical piles and place them on the drill pipe placement rack.

[0024] The beneficial effects of the present invention are: it can not only effectively improve the construction efficiency of tunnel reinforcement, but also support the tunnel from multiple angles, and the tunnel reinforcement effect is good. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a construction system for multi-angle cement-soil piles in a subway tunnel in the first specific embodiment of the present invention.

[0026] Figure 2 It is a partial structural diagram of a high-pressure jet grouting rig and a drill pipe installation device for constructing inclined piles in the multi-angle cement-soil pile construction system in the subway tunnel in the first specific embodiment of the present invention.

[0027] Figure 3 It is Figure 1 A partial view in the A direction in

[0028] Figure 4 It is Figure 2 A partial enlarged view at B in

[0029] Figure 5 It is a partial structural diagram of a jet grouting drill pipe in the first specific embodiment of the present invention.

[0030] Figure 6 It is a schematic structural diagram at the drill pipe placement rack in the first specific embodiment of the present invention.

[0031] Figure 7 It is a partial structural diagram at the centrifugal locking device in the third specific embodiment of the present invention.

[0032] Figure 8 It is Figure 7 A partial enlarged view at C in

[0033] Figure 9 It is a partial structural diagram of a multi-angle cement-soil pile construction system in a subway tunnel in the fourth specific embodiment of the present invention, in which the second sliding seat abuts against the lower limit block of the sliding seat.

[0034] Figure 10 It is a partial enlarged view at D in 9.

[0035] Figure 11 It is another partial structural diagram of a multi-angle cement-soil pile construction system in a subway tunnel in the fourth specific embodiment of the present invention, in which the second sliding seat abuts against the upper limit block of the sliding seat.

[0036] In the figure:

[0037] Traveling vehicle 1;

[0038] High-pressure jet grouting rig 2:

[0039] Jet grouting drill pipe 2.1, connecting drill pipe 2.11, polygonal insertion pipe 2.111, polygonal insertion hole 2.112, tail drill pipe 2.12, drill pipe head 2.13, drill bit 2.131, high-pressure jet grouting hole 2.132, rotating connector 2.14, cement grouting port 2.15;

[0040] Frame 2.2; Support tower 2.3; Rotary power head 2.4; Rotating seat 2.5;

[0041] Sliding seat 2.6, first sliding seat 2.61, second guide rail 2.62, second sliding seat 2.63, upper limit block of sliding seat 2.64, lower limit block of sliding seat 2.65;

[0042] Rotating seat rotation actuator 2.7; First guide rail 2.8;

[0043] Centrifugal locking device 2.9, radial sliding sleeve 2.91, radial locking rod 2.92, tension spring 2.93, limit sliding groove 2.94, slider 2.95;

[0044] Cement supply device 3, cement feeding pump 3.1, cement agitator 3.2, upper mixing barrel 3.21, cement slurry storage barrel 3.22, feeding input pipe 3.3, feeding output pipe 3.4;

[0045] Drill pipe placement rack 4, drill pipe placement rack 4.1, lower mounting plate 4.11, upper mounting plate 4.12, rotary drive device 4.2;

[0046] Manipulator 4a;

[0047] Tail drill pipe separation anti-rotation alignment device 5, fixed sleeve 5.1, locking sleeve 5.2, axial locking groove 5.3, locking plate receiving groove 5.4, locking plate 5.5, shaft rod 5.6. Detailed implementation mode

[0048] To make the objectives, technical solutions and advantages of the embodiments of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly explained and described below with reference to the accompanying drawings. However, the following embodiments are only the preferred embodiments of the present invention, rather than all embodiments. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0049] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the solution, and cannot be construed as a limitation of the solution of the present invention.

[0050] These and other aspects of the embodiments of the present invention will be apparent from the following description and the accompanying drawings. In these descriptions and drawings, specific embodiments of the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the scope of the embodiments of the present invention is not limited thereto. On the contrary, the embodiments of the present invention include all variations, modifications and equivalents falling within the spirit and scope of the appended claims.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined, and the meaning of "several" means one or more.

[0052] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Specific Embodiment 1: As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, a multi-angle cement-soil pile construction system in a subway tunnel includes a walking vehicle 1, a pile machine group, and a cement supply device 3. The walking vehicle can move in the subway tunnel, and an installation platform is provided on the walking vehicle. The walking vehicle is a crawler walking vehicle, a wheeled walking vehicle, or a track walking vehicle suitable for walking on rails. In this embodiment, the walking vehicle is a track walking vehicle suitable for walking on rails. In this way, the walking vehicle can directly move on the rails in the constructed subway tunnel to adapt to the radial reinforcement of the constructed subway tunnel.

[0054] The pile machine set includes two high-pressure jet grouting machines 2 for constructing inclined piles and arranged on the installation platform. The jet grouting drill rod 2.1 of one high-pressure jet grouting machine for constructing inclined piles inclines towards the left side of the installation platform, and the inclination angle of the jet grouting drill rod is 0 - 90 degrees. For example, the inclination angle of the jet grouting drill rod is 10 degrees or 20 degrees or 30 degrees or 40 degrees or 50 degrees or 60 degrees or 70 degrees or 80 degrees; in this embodiment, the inclination angle of the jet grouting drill rod is 60 degrees. The jet grouting drill rod 2.1 of the other high-pressure jet grouting machine for constructing inclined piles inclines towards the right side of the installation platform, and the inclination angle of the jet grouting drill rod is 0 - 90 degrees. For example, the inclination angle of the jet grouting drill rod is 10 degrees or 20 degrees or 30 degrees or 40 degrees or 50 degrees or 60 degrees or 70 degrees or 80 degrees; in this embodiment, the inclination angle of the jet grouting drill rod is 60 degrees.

[0055] In this embodiment, the two high-pressure jet grouting machines for constructing inclined piles are arranged in sequence along the front-back direction of the walking vehicle.

[0056] The high-pressure jet grouting machine 2 further includes a vehicle frame 2.2, a support tower 2.3 arranged on the vehicle frame, a first guide rail 2.8 arranged on the support tower, a sliding seat 2.6 sliding along the first guide rail, a sliding seat moving actuator for driving the sliding seat, and a rotary power head 2.4 arranged on the sliding seat. The sliding seat moving actuator is an oil cylinder or an electric cylinder or a linear slide rail or other moving actuators arranged on the support tower. In this embodiment, the sliding seat moving actuator is a chain drive mechanism arranged on the support tower, and the sliding seat is connected to the chain of the chain drive mechanism. The high-pressure jet grouting machine is installed on the installation platform through the vehicle frame.

[0057] The jet grouting drill rod includes a drill body, a drill rod head arranged at the lower end of the drill body, and a drill rod tail arranged at the upper end of the drill body. The drill body is composed of several connecting drill pipes 2.11 connected in sequence. The drill rod tail includes a tail drill pipe 2.12 rotatably arranged on the sliding seat, a rotary joint 2.14 rotatably connected to the upper end of the tail drill pipe, and a cement grouting port 2.15 arranged on the rotary joint. The rotary power head 2.13 is used to drive the tail drill pipe to rotate. In this embodiment, the rotary power head includes a driving motor for driving the tail drill pipe. A drill bit 2.131 is arranged at the lower end of the drill rod head. The inner hole of the connecting drill pipe forms a grouting pipeline. High-pressure jet grouting holes 2.132 are arranged at the lower part of the side wall of the drill rod head, and the high-pressure jet grouting holes are communicated with the grouting pipeline.

[0058] The upper end of the connecting drill pipe 2.11 is provided with a polygonal insertion hole 2.112, and the lower end of the connecting drill pipe is provided with a polygonal insertion pipe 2.111. Radial bolt holes communicating with the polygonal insertion hole and locking bolts cooperating with the radial bolt holes are provided on the outer side surface of the connecting drill pipe. Among any two adjacent connecting drill pipes, the polygonal insertion pipe of one connecting drill pipe is inserted into the polygonal insertion hole of the other connecting drill pipe. The lower end of the tail drill pipe is also provided with a polygonal insertion pipe 2.111 for cooperating with the polygonal insertion hole. The drill rod head is fixed to the lower end of a connecting drill pipe at the lowermost end of the drill body.

[0059] The cement supply device 3 includes a cement feeding pump 3.1 and a cement mixer 3.2 arranged on the installation platform. The cement mixer is used for mixing cement, and the cement feeding pump supplies the cement mixed by the cement mixer to the high-pressure jet grouting pile machine through a feeding pipeline.

[0060] The multi-angle cement-soil pile construction system in the subway tunnel of this embodiment travels directly in the subway tunnel through a traveling vehicle. Every time the traveling vehicle travels a set distance, two high-pressure jet grouting pile machines for constructing inclined piles simultaneously construct high-pressure jet grouting piles with an inclined distribution under the tunnel. Among them, one high-pressure jet grouting pile machine with a jet grouting drill rod inclined to the left side of the installation platform constructs a left-inclined high-pressure jet grouting pile in the lower left of the tunnel, and one high-pressure jet grouting pile machine with a jet grouting drill rod inclined to the right side of the installation platform constructs a right-inclined high-pressure jet grouting pile in the lower right of the tunnel, so as to provide reliable support and reinforcement for the tunnel from multiple angles through the right-inclined high-pressure jet grouting pile and the left-inclined high-pressure jet grouting pile; in this way, the right-inclined high-pressure jet grouting pile and the left-inclined high-pressure jet grouting pile can be constructed sequentially along the subway tunnel, and the tunnel reinforcement effect is good. On the other hand, compared with the prior art that each high-pressure jet grouting pile machine can only construct one high-pressure jet grouting pile at a time, in this solution, two high-pressure jet grouting pile machines for constructing inclined piles simultaneously construct two high-pressure jet grouting piles with an inclined distribution under the tunnel, so that the tunnel reinforcement construction efficiency can be effectively improved.

[0061] Further, as Figure 2 、 Figure 4 shown, the high-pressure jet grouting pile machine further includes a rotating seat 2.5 rotatably arranged on the vehicle frame through a horizontal shaft and a rotating seat rotation execution mechanism 2.7 for driving the rotating seat to rotate. The horizontal shaft is parallel to the front-rear direction of the vehicle frame. In this embodiment, the rotating seat rotation execution mechanism is an oil cylinder, one end of the oil cylinder is hinged to the vehicle frame, and the other end of the oil cylinder is hinged to the rotating seat. The support tower rod is fixed to the rotating seat. In this way, the inclination angle of the jet grouting drill rod can be adjusted to meet the construction requirements of high-pressure jet grouting piles with different inclination angles.

[0062] Further, as Figure 1 、 Figure 2As shown, a pipe installation device is also provided on the installation platform between two high-pressure jet grouting rigs for constructing inclined piles. The pipe installation device includes a drill pipe placement rack 4 and a manipulator 4a provided on the installation platform. The drill pipe placement rack is used to place the connecting drill pipes of the jet grouting drill rods, and the manipulator is used to carry and install the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rods of the high-pressure jet grouting rig for constructing inclined piles, or to remove the connecting drill pipes on the jet grouting drill rods of the high-pressure jet grouting rig for constructing inclined piles and place them on the drill pipe placement rack. During the process of the jet grouting drill rod of the high-pressure jet grouting rig drilling into the soil layer, after the jet grouting drill rod drills into the specified depth each time, the sliding seat moving actuator drives the sliding seat, the rotary power head and the tail of the drill rod to move upward a set distance along the first guide rail, so that the polygonal insertion pipe at the lower end of the tail drill pipe is separated from the polygonal insertion hole at the upper end of the connecting drill pipe; then, the manipulator is used to carry and install a connecting drill pipe on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting rig. Specifically, the manipulator grabs a connecting drill pipe on the drill pipe placement rack, and then inserts the polygonal insertion pipe at the lower end of the connecting drill pipe into the polygonal insertion hole of the connecting drill pipe at the upper end of the jet grouting drill rod; then, the sliding seat moving actuator drives the sliding seat, the rotary power head and the tail of the drill rod to move downward a set distance along the first guide rail, so that the polygonal insertion pipe at the lower end of the tail drill pipe is inserted into the polygonal insertion hole at the upper end of the connecting drill pipe. To achieve that the manipulator is used to carry and install a connecting drill pipe on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting rig; then the operator tightens the locking bolts to connect two adjacent connecting drill pipes.

[0063] Similarly, after the jet grouting drill rod of the high-pressure jet grouting rig drills into the set depth of the soil layer, during the process of the jet grouting drill rod moving back (i.e., moving upward), after the jet grouting drill rod moves back a specified length each time, the manipulator is used to remove the connecting drill pipe on the jet grouting drill rod of the high-pressure jet grouting rig and place it on the drill pipe placement rack; thus, during the construction of the high-pressure jet grouting pile, there is no need for manual handling to install or remove the connecting drill pipes of the jet grouting drill rod, so as to reduce manual operation, lower the labor intensity, and improve the construction efficiency of tunnel reinforcement.

[0064] Further, as Figure 2 , Figure 6As shown in the figure, the drill pipe placement rack 4 includes a base frame arranged on the installation platform, a rotating bracket 4.1 rotatably arranged on the base frame through a vertical shaft rod, and a rotary drive device 4.2 for driving the rotating bracket to rotate around the vertical shaft rod. A plurality of vertically inserted holes are circumferentially and uniformly distributed around the vertical shaft rod on the rotating bracket, and the vertically inserted holes are used for inserting the connecting drill pipes of the jet grouting drill rod. The rotating bracket includes an upper installation flat plate 4.12, a lower installation flat plate 4.11, and a connecting member connecting the upper installation flat plate and the lower installation flat plate. The vertically inserted holes include a polygonal insertion hole arranged on the upper installation flat plate and a lower limit hole arranged on the lower installation flat plate. In this way, the connecting drill pipes to be installed and the connecting drill pipes disassembled from the jet grouting drill rod can be inserted into the vertically inserted holes. On the one hand, it is beneficial to utilize the height space to place the connecting drill pipes. On the other hand, it is convenient for the manipulator to grab the connecting drill pipes.

[0065] Further, as Figure 1 shown in the figure, the cement mixer 3.2 includes an upper mixing barrel 3.21 for mixing cement, a feeding pipe arranged at the bottom of the upper mixing barrel, a first switch valve arranged on the feeding pipe, a cement slurry storage barrel 3.22 located below the upper mixing barrel, and a discharge pipe arranged at the bottom of the cement slurry storage barrel. In this embodiment, a mixing paddle and a rotating motor for driving the mixing paddle to rotate are further arranged on the upper mixing barrel. The outlet of the feeding pipe is located above the barrel mouth of the cement slurry storage barrel. The cement slurry storage barrel is used to receive the cement slurry discharged from the feeding pipe. A second switch valve is arranged on the discharge pipe. The feeding pipeline includes a feeding input pipe 3.3 connecting the inlet of the cement feeding pump and the discharge pipe, a feeding output pipe 3.4 connected to the outlet of the cement feeding pump, and a plurality of branch pipelines. The branch pipelines correspond to the high-pressure jet grouting machines of the pile forming unit one by one. One end of the branch pipeline is connected to the feeding output pipe, and the other end of the branch pipeline is connected to the cement injection port of the corresponding high-pressure jet grouting machine. The cement mixer of this embodiment mixes cement through the upper mixing barrel, outputs the mixed cement slurry to the cement slurry storage barrel through the feeding pipe, and supplies the cement slurry in the cement slurry storage barrel to the high-pressure jet grouting machine through the cement feeding pump and the feeding pipeline; in this way, through the continuous operation of the upper mixing barrel, every time a barrel of cement is mixed well in the upper mixing barrel, the mixed cement slurry in the upper mixing barrel can be output to the cement slurry storage barrel as needed to ensure that the cement slurry in the cement slurry storage barrel can meet the continuous operation needs of the high-pressure jet grouting machine.

[0066] Specific Embodiment 2, the rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference is that

[0067] The pile driving unit further includes a high-pressure jet grouting rig (not shown in the figure) for constructing vertical piles, which is arranged on the installation platform. Two high-pressure jet grouting rigs for constructing inclined piles are located on the same side of the high-pressure jet grouting rig for constructing vertical piles. In this embodiment, the high-pressure jet grouting rig for constructing vertical piles, the two high-pressure jet grouting rigs for constructing inclined piles and the cement supply device are sequentially distributed from the head to the tail of the walking vehicle. In this embodiment, for the specific structure of the high-pressure jet grouting rig for constructing vertical piles, refer to the specific structure of the high-pressure jet grouting rig for constructing inclined piles in Embodiment 1. The difference is that the jet grouting drill pipe of the high-pressure jet grouting rig for constructing vertical piles is vertically distributed. There is a vertical through hole on the installation platform, and the jet grouting drill pipe of the high-pressure jet grouting rig for constructing vertical piles passes through the vertical through hole.

[0068] In this way, the vertical high-pressure jet grouting piles vertically distributed can be constructed under the tunnel by the high-pressure jet grouting rig for constructing vertical piles. Cooperating with the two high-pressure jet grouting rigs for constructing inclined piles, the vertical high-pressure jet grouting piles and two inclined high-pressure jet grouting piles are constructed simultaneously under the tunnel to provide reliable multi-angle support and reinforcement for the tunnel, and the tunnel reinforcement effect is good.

[0069] A drill pipe installation device (not shown in the figure) is also arranged on the installation platform on one side of the high-pressure jet grouting rig for constructing vertical piles. The specific structure of this drill pipe installation device refers to the drill pipe installation device in Embodiment 1.

[0070] Specific Embodiment 3, for the rest of the structure of this embodiment, refer to Specific Embodiment 1 or Specific Embodiment 2. The difference is that

[0071] such as Figure 7 、 Figure 8As shown in the figure, the high-pressure jet grouting rig further includes a centrifugal locking device 2.9. Specifically, each high-pressure jet grouting rig includes a centrifugal locking device. Radial mounting holes are provided on the outer side surfaces of the polygonal insertion pipes 2.111 of each connecting drill pipe and the polygonal insertion pipes 2.111 at the lower end of the tail drill pipe. The radial mounting holes extend along the radial direction of the polygonal insertion pipes. The centrifugal locking devices correspond to the radial mounting holes one by one. The centrifugal locking device includes a radial sliding sleeve 2.91 disposed in the corresponding radial mounting hole and a radial locking rod 2.92 slidably disposed in the radial sliding sleeve. The axis of the radial sliding sleeve extends along the radial direction of the polygonal insertion pipe. The outer end of the radial sliding sleeve is open, and the outer end of the radial sliding sleeve is located in the radial mounting hole. The inner end of the radial sliding sleeve is closed, and the inner end of the radial locking rod is connected to the inner end of the radial sliding sleeve through a tension spring 2.93. In this embodiment, a tension spring receiving hole is provided at the inner end of the radial locking rod, the tension spring is located in the tension spring receiving hole, one end of the tension spring is connected to the inner end of the tension spring receiving hole, and the other end of the tension spring is connected to the inner end of the radial sliding sleeve. The inner end of the radial locking rod abuts against the inner end face of the radial sliding sleeve under the action of the tension spring. When the inner end of the radial locking rod abuts against the inner end face of the radial sliding sleeve, the radial locking rod is completely located in the radial sliding sleeve. Annular clamping grooves for cooperating with the radial locking rods are provided on the inner side walls of the polygonal insertion holes of each connecting drill pipe.

[0072] After the polygonal insertion pipe is inserted into the polygonal insertion hole (in the text, after the polygonal insertion pipe is inserted into the polygonal insertion hole, it means that the lower end face of the connecting drill pipe where the polygonal insertion pipe is located abuts against the upper end face of the connecting drill pipe where the polygonal insertion hole is located), the radial locking rod on the polygonal insertion pipe faces the annular clamping groove in the corresponding polygonal insertion hole. When the rotation speed of the jet grouting drill rod exceeds the set value, the radial locking rod on the jet grouting drill rod will overcome the tension of the tension spring under the action of centrifugal force, slide outwards along the radial sliding sleeve, and insert the outer end of the radial locking rod into the corresponding annular clamping groove.

[0073] In the prior art, after the jet grouting drill pipe drills to a specified depth each time, the sliding seat moving actuator drives the sliding seat, the rotary power head and the tail of the drill pipe to move upward a set distance along the first guide rail. Then, the operator installs another connecting drill pipe onto the jet grouting drill pipe. Then, the sliding seat moving actuator drives the sliding seat, the rotary power head and the tail of the drill pipe to move downward a set distance along the first guide rail, so that the polygonal insertion pipe at the lower end of the tail drill pipe is inserted into the polygonal insertion hole at the upper end of the connecting drill pipe. Then, the operator tightens the locking bolt to connect two adjacent connecting drill pipes. However, in actual construction, there are situations where the operator does not tighten the locking bolt properly due to non-standard operation, or the tightening is insufficient, or the thread of the locking bolt and / or the thread of the threaded hole cooperating with the locking bolt is damaged, or the locking bolt becomes loose due to vibration, resulting in unreliable connection of two adjacent connecting drill pipes. As a result, during the process of the sliding seat moving actuator driving the sliding seat and the jet grouting drill pipe to move upward along the first guide rail, the connecting drill pipe connected at a certain place in the jet grouting drill pipe drilled into the soil layer becomes disconnected, causing a failure in the construction of the high-pressure jet grouting pile, and a part of the jet grouting drill pipe falls into the soil layer. To solve the above problems, this solution provides a centrifugal locking device. Specifically,

[0074] During the process of the jet grouting drill pipe constructing a high-pressure jet grouting pile, the jet grouting drill pipe is in a high-speed rotating state. At this time, the radial locking rod will be inserted into the corresponding annular slot under the action of centrifugal force. In this way, while the jet grouting drill pipe rotates, it generally moves back. During the process of constructing a high-pressure jet grouting pile in the soil layer, even if the locking bolts of two connecting drill pipes are not tightened, these two connecting drill pipes will not become disconnected under the cooperation of the radial locking rod and the annular slot, thus effectively solving the above problems. On the other hand, since the polygonal insertion pipe at the lower end of the tail drill pipe is also provided with a centrifugal locking device, during the process of the jet grouting drill pipe constructing a high-pressure jet grouting pile, the radial locking rod on the polygonal insertion pipe at the lower end of the tail drill pipe will be inserted into the corresponding annular slot under the action of centrifugal force. In this way, the operator does not need to tighten the locking bolt on a connecting drill pipe adjacent to the tail drill pipe, and the operation of tightening the locking bolt to connect the tail drill pipe and the connecting drill pipe can be omitted, which can further simplify the operation steps of manually tightening the locking bolt. During the process of the jet grouting drill pipe of the high-pressure jet grouting machine drilling into the soil layer, and during the process of the jet grouting drill pipe of the high-pressure jet grouting machine moving back after drilling to a set depth in the soil layer, the operator only needs to tighten the locking bolt to connect two adjacent connecting drill pipes, and the operation of tightening the locking bolt to connect the tail drill pipe and the connecting drill pipe can be omitted.

[0075] In this embodiment, the radial sliding sleeve and the radial mounting hole are connected by threads. In this way, it is convenient for the installation and disassembly of the radial sliding sleeve.

[0076] On the inner wall of the radial sliding sleeve, there is a limit sliding groove 2.94 extending along the axial direction of the radial sliding sleeve. On the outer side surface of the radial locking rod, there is a sliding block 2.95 that cooperates with the limit sliding groove. In this way, the radial locking rod can be prevented from disengaging from the radial sliding sleeve.

[0077] Specific Embodiment 4. For the rest of the structure of this embodiment, refer to Specific Embodiment 1 or Specific Embodiment 2 or Specific Embodiment 3. The difference is that

[0078] As Figure 9 , Figure 10 shown, the high-pressure rotary jet grouting rig further includes a tail drill pipe separation anti-rotation and alignment device 5. Specifically, each high-pressure rotary jet grouting rig includes a tail drill pipe separation anti-rotation and alignment device. The sliding seat 2.6 of the high-pressure rotary jet grouting rig includes a first sliding seat 2.61 slidably arranged on the first guide rail, a second guide rail 2.62 arranged on the first sliding seat and parallel to the first guide rail, a sliding seat upper limit block 2.64 and a sliding seat lower limit block 2.65 arranged on the first sliding seat, and a second sliding seat 2.63 slidably arranged on the second guide rail and located between the sliding seat upper limit block and the sliding seat lower limit block. The sliding seat movement execution mechanism is used to drive the first sliding seat to move along the first guide rail.

[0079] The tail drill pipe separation anti-rotation and alignment device 5 includes a torsion spring, a fixed sleeve 5.1 fixedly arranged at the lower part of the tail drill pipe, a plurality of axial locking grooves 5.3 circumferentially and evenly distributed on the lower part of the outer side surface of the fixed sleeve, a locking sleeve 5.2 sleeved on the lower part of the tail drill pipe, a connecting piece connecting the locking sleeve and the first sliding seat, a locking plate accommodating groove 5.4 arranged on the inner wall of the locking sleeve, a locking plate 5.5 for cooperating with the axial locking groove, and a locking plate limiting piece arranged in the locking plate accommodating groove. The outer side surface of the fixed sleeve, the locking sleeve and the rotation axis of the tail drill pipe are coaxially distributed. The axial locking groove extends along the rotation axis direction of the tail drill pipe, and the lower end of the axial locking groove communicates with the lower end surface of the fixed sleeve. In this embodiment, the number of axial locking grooves is 10 - 30. The upper part of the locking plate is located in the locking plate accommodating groove, and the upper part of the locking plate is rotatably arranged in the locking plate accommodating groove through a shaft rod 5.6. The locking plate limiting piece is located outside the locking plate. The torsion spring is used to drive the lower part of the locking plate to rotate towards the axis direction of the locking sleeve around the shaft rod.

[0080] As Figure 9 shown, when the second sliding seat abuts against the sliding seat lower limit block, the locking sleeve is sleeved outside the fixed sleeve. The lower part of the locking plate abuts against the upper part of the outer side surface of the fixed sleeve under the action of the torsion spring, and the locking plate is located above the locking plate accommodating groove. In this embodiment, a ball is arranged on the side of the lower part of the locking plate facing the center of the locking sleeve. When the second sliding seat abuts against the sliding seat lower limit block, the locking sleeve is sleeved outside the fixed sleeve, and the ball on the lower part of the locking plate abuts against the upper part of the outer side surface of the fixed sleeve under the action of the torsion spring, and the locking plate is located above the locking plate accommodating groove.

[0081] AsFigure 11 As shown, when the second sliding seat abuts against the upper limit block of the sliding seat, the fixing sleeve is located above the locking sleeve. Under the action of the torsion spring, the locking plate abuts against the locking plate limiting member, and the lower part of the locking plate extends into the inner hole of the locking sleeve.

[0082] During the construction of high-pressure jet grouting piles by a high-pressure jet grouting rig, it often happens that the operator's operation is not standardized or there are misoperations, resulting in the failure of the polygonal insertion pipe at the lower end of the tail drill pipe to be inserted into the polygonal insertion hole of the connecting drill pipe, which seriously affects the construction operation efficiency. Specifically, during the process of the jet grouting drill pipe of the high-pressure jet grouting rig drilling into the soil layer, before the jet grouting drill pipe completely stops rotating, the operator controls the sliding seat moving actuator to drive the sliding seat, the rotary power head and the drill pipe tail to move upward along the first guide rail, so that the tail insertion pipe at the lower end of the tail drill pipe is separated from the polygonal insertion hole of the connecting drill pipe; at this time, since the jet grouting drill pipe has not stopped rotating, after the tail insertion pipe at the lower end of the tail drill pipe is separated from the polygonal insertion hole, the connecting drill pipe of the drill body of the jet grouting drill pipe will quickly stop rotating under the action of the soil layer resistance, while the tail drill pipe will continue to rotate for a certain period. In this way, it is very easy to cause the misalignment of the polygonal insertion pipe at the lower end of the tail drill pipe and the polygonal insertion hole of the connecting drill pipe (that is, the polygonal insertion pipe and the polygonal insertion hole are not aligned). Thus, when the manipulator grabs a connecting drill pipe on the drill pipe placement rack and inserts the polygonal insertion pipe at the lower end of the connecting drill pipe into the polygonal insertion hole of the connecting drill pipe at the upper end of the jet grouting drill pipe, during the process of the sliding seat moving actuator driving the sliding seat, the rotary power head and the drill pipe tail to move downward along the first guide rail, due to the misalignment of the polygonal insertion pipe at the lower end of the tail drill pipe and the polygonal insertion hole of the connecting drill pipe, the polygonal insertion pipe at the lower end of the tail drill pipe will not be able to be inserted into the polygonal insertion hole of the connecting drill pipe.

[0083] In order to solve the problem that during the construction of high-pressure jet grouting piles by a high-pressure jet grouting rig, it often happens that the operator's operation is not standardized or there are misoperations, resulting in the failure of the polygonal insertion pipe at the lower end of the tail drill pipe to be inserted into the polygonal insertion hole of the connecting drill pipe, which seriously affects the construction operation efficiency, in this embodiment, a tail drill pipe separation anti-rotation alignment device is provided. Specifically,

[0084] During the process of the rotary jet drill pipe of the high-pressure rotary jet grouting rig drilling into the soil layer, the lower end face of the tail drill pipe abuts against the upper end face of the connecting drill pipe at the upper end of the rotary jet drill pipe, and the second sliding seat abuts against the upper limit block on the sliding seat; the sliding seat moving actuator drives the second sliding seat and the rotary jet drill pipe to move downward together through the upper limit block on the sliding seat of the first sliding seat, so that the rotary jet drill pipe drills into the soil layer; after the rotary jet drill pipe drills into the specified depth each time, if the operator installs the regulations, after the rotary jet drill pipe completely stops rotating, the sliding seat moving actuator is controlled to drive the sliding seat, the rotary power head and the drill pipe tail to move upward along the first guide rail, so that the tail insertion pipe at the lower end of the tail drill pipe is separated from the polygonal insertion hole of the connecting drill pipe, then the tail insertion pipe at the lower end of the tail drill pipe and the polygonal insertion hole of the connecting drill pipe remain in an aligned state and will not affect normal use;

[0085] If, when the rotary jet drill pipe has not completely stopped rotating, the operator controls the sliding seat moving actuator to drive the sliding seat, the rotary power head and the drill pipe tail to move upward along the first guide rail. During this process, the first sliding seat and the locking sleeve first move upward along the first guide rail until the lower limit block of the sliding seat abuts against the second sliding seat. During this process, the second sliding seat and the tail drill pipe remain abutted against the upper end face of the connecting drill pipe at the upper end of the rotary jet drill pipe under the action of their own weights and do not move; and during the process of the locking sleeve moving upward along the first guide rail, the locking sleeve will be sleeved outside the fixed sleeve from bottom to top, so that the lower part of the locking plate abuts against the outer side surface of the fixed sleeve under the action of the torsion spring. Since the tail drill pipe and the fixed sleeve are still rotating during this process, after the lower part of the locking plate is aligned with one of the axial locking grooves, the lower part of the locking plate is snapped into the axial locking groove under the action of the torsion spring, thereby locking the tail drill pipe and stopping the rotation of the rotary jet drill pipe; thereafter, the locking sleeve continues to move upward until the lower limit block of the sliding seat abuts against the second sliding seat; when the lower limit block of the sliding seat abuts against the second sliding seat, the locking plate is separated from the locking plate receiving groove and is located above the locking plate receiving groove. After the lower limit block of the sliding seat abuts against the second sliding seat, the sliding seat moving actuator drives the first sliding seat, the second sliding seat, the rotary power head and the drill pipe tail to move upward synchronously along the first guide rail, so that the tail insertion pipe at the lower end of the tail drill pipe is separated from the polygonal insertion hole of the connecting drill pipe. During this process, since the rotary jet drill pipe has stopped rotating, the tail insertion pipe at the lower end of the tail drill pipe and the polygonal insertion hole of the connecting drill pipe remain in an aligned state and will not affect normal use.

[0086] On the other hand, after the rotary jet drill pipe of the high-pressure rotary jet grouting rig drills into the set depth of the soil layer and during the process of the rotary jet drill pipe moving back, the lower limit block of the sliding seat abuts against the second sliding seat, and the sliding seat moving actuator drives the first sliding seat, the second sliding seat, the rotary power head and the drill pipe tail to move upward synchronously along the first guide rail, thereby realizing the movement of the rotary jet drill pipe back; at the same time, since when the lower limit block of the sliding seat abuts against the second sliding seat, the locking plate is separated from the locking plate receiving groove and is located above the locking plate receiving groove, in this way, it will not affect the rotation of the rotary jet drill pipe, and thus it will not affect the construction of the high-pressure rotary jet grouting pile by the rotary jet drill pipe.

[0087] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A multi-angle cement-soil pile construction system in a subway tunnel, characterized in that, it includes: A walking vehicle, on which there is an installation platform. The walking vehicle can move in the subway tunnel. The walking vehicle is a crawler-type walking vehicle, a wheel-type walking vehicle or a track walking vehicle suitable for walking on the railway track; A pile construction unit, which includes two high-pressure jet grouting machines for constructing inclined piles arranged on the installation platform. The jet grouting drill rod of one high-pressure jet grouting machine for constructing inclined piles inclines to the left side of the installation platform, and the inclination angle of the jet grouting drill rod is 0-90 degrees; the jet grouting drill rod of the other high-pressure jet grouting machine for constructing inclined piles inclines to the right side of the installation platform, and the inclination angle of the jet grouting drill rod is 0-90 degrees; the jet grouting drill rod includes a drill body, and the drill body is composed of several connecting drill pipes connected in sequence; The high-pressure jet grouting machine includes a tail drill pipe separation anti-rotation alignment device, which includes a torsion spring, a fixed sleeve fixedly arranged at the lower part of the tail drill pipe, several axially locking grooves circumferentially and evenly distributed on the lower outer side of the fixed sleeve, a locking sleeve sleeved on the lower part of the tail drill pipe, a connecting piece connecting the locking sleeve and the first sliding seat, a locking plate accommodating groove arranged on the inner wall of the locking sleeve, a locking plate for cooperating with the axially locking groove, and a locking plate limiting member arranged in the locking plate accommodating groove; A cement supply device, which includes a cement feeding pump and a cement mixer arranged on the installation platform. The cement mixer is used for mixing cement, and the cement feeding pump supplies the cement mixed by the cement mixer to the high-pressure jet grouting machine through a feeding pipeline.

2. The multi-angle cement-soil pile construction system in a subway tunnel according to claim 1, characterized in that, The high-pressure jet grouting machine further includes a vehicle frame installed on the installation platform, a support tower rod arranged on the vehicle frame, a first guide rail arranged on the support tower rod, a sliding seat sliding along the first guide rail, a sliding seat moving actuator for driving the sliding seat, and a rotary power head arranged on the sliding seat; The jet grouting drill rod further includes a drill rod head arranged at the lower end of the drill body and a drill rod tail arranged at the upper end of the drill body. The drill rod tail includes a tail drill pipe rotatably arranged on the sliding seat, a rotating connection head rotatably connected to the upper end of the tail drill pipe, and a cement grouting port arranged on the rotating connection head. The rotary power head is used for driving the tail drill pipe to rotate. The lower end of the drill rod head is provided with a drill bit, and the lower part of the side wall of the drill rod head is provided with high-pressure jet grouting holes; One end of the connecting drill pipe is provided with a polygonal insertion hole, the other end of the connecting drill pipe is provided with a polygonal insertion pipe, the outer side surface of the connecting drill pipe is provided with a radial bolt hole communicated with the polygonal insertion hole and a locking bolt for cooperating with the radial bolt hole. Among any two adjacent connecting drill pipes, the polygonal insertion pipe of one connecting drill pipe is inserted into the polygonal insertion hole of the other connecting drill pipe, and the lower end of the tail drill pipe is also provided with a polygonal insertion pipe for cooperating with the polygonal insertion hole.

3. The multi-angle cement-soil pile construction system in a subway tunnel according to claim 2, characterized in that, The high-pressure jet grouting pile machine further includes a centrifugal locking device. Radial mounting holes are provided on the outer sides of the polygonal insertion pipes of each connecting drill pipe and the polygonal insertion pipe at the lower end of the tail drill pipe. The centrifugal locking device corresponds to the radial mounting holes one by one. The centrifugal locking device includes a radial sliding sleeve arranged in the corresponding radial mounting hole and a radial locking rod slidably arranged in the radial sliding sleeve. The inner end of the radial sliding sleeve is closed, and a tension spring is connected between the inner end of the radial locking rod and the inner end of the radial sliding sleeve. Annular clamping grooves for cooperating with the radial locking rods are provided on the inner side walls of the polygonal insertion holes of each connecting drill pipe; After the polygonal insertion pipe is inserted into the polygonal insertion hole, the radial locking rod on the polygonal insertion pipe faces the annular clamping groove in the corresponding polygonal insertion hole; When the rotation speed of the jet grouting drill rod exceeds the set value, the radial locking rod on the jet grouting drill rod will overcome the tension of the tension spring under the action of centrifugal force, slide outwards along the radial sliding sleeve, and insert the outer end of the radial locking rod into the corresponding annular clamping groove.

4. The construction system for multi-angle cement-soil piles in a subway tunnel according to claim 1 or 2 or 3, characterized in that, A drill pipe installation device is further provided on the installation platform between two high-pressure jet grouting pile machines for constructing inclined piles. The drill pipe installation device includes a drill pipe placement rack and a manipulator arranged on the installation platform. The drill pipe placement rack is used for placing the connecting drill pipes of the jet grouting drill rod, and the manipulator is used to carry and install the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting pile machine for constructing inclined piles, or to remove the connecting drill pipes on the jet grouting drill rod of the high-pressure jet grouting pile machine for constructing inclined piles and place them on the drill pipe placement rack.

5. The construction system for multi-angle cement-soil piles in a subway tunnel according to claim 4, characterized in that, The drill pipe placement rack includes a bottom rack arranged on the installation platform, a rotating bracket rotatably arranged on the bottom rack through a vertical shaft rod, and a rotation driving device for driving the rotating bracket to rotate around the vertical shaft rod. A plurality of vertically inserted holes are circumferentially and uniformly distributed around the vertical shaft rod on the rotating bracket, and the vertically inserted holes are used for inserting the connecting drill pipes of the jet grouting drill rod.

6. The construction system for multi-angle cement-soil piles in a subway tunnel according to claim 2 or 3, characterized in that, The sliding seat includes a first sliding seat slidably arranged on the first guide rail, a second guide rail arranged on the first sliding seat and parallel to the first guide rail, a sliding seat upper limit block and a sliding seat lower limit block arranged on the first sliding seat, and a second sliding seat slidably arranged on the second guide rail and located between the sliding seat upper limit block and the sliding seat lower limit block. The sliding seat moving actuator is used to drive the first sliding seat to move along the first guide rail; The outer side surface of the fixed sleeve, the rotation axis of the locking sleeve and the rotation axis of the tail drill pipe are coaxially distributed. The axial locking groove extends along the rotation axis direction of the tail drill pipe, and the lower end of the axial locking groove communicates with the lower end surface of the fixed sleeve. The upper part of the locking plate is located in the locking plate receiving groove, and the upper part of the locking plate is rotatably arranged in the locking plate receiving groove through a shaft rod. The locking plate limiting member is located outside the locking plate, and the torsion spring is used to drive the lower part of the locking plate to rotate around the shaft rod towards the axis direction of the locking sleeve; When the second sliding seat abuts against the lower limit block of the sliding seat, the locking sleeve is sleeved outside the fixed sleeve. The lower part of the locking plate abuts against the upper part of the outer side of the fixed sleeve under the action of the torsion spring, and the locking plate is located above the locking plate receiving groove. When the second sliding seat abuts against the upper limit block of the sliding seat, the fixed sleeve is located above the locking sleeve.

7. The multi-angle soil-cement pile construction system in the subway tunnel according to claim 2 or 3, wherein, the high-pressure jet grouting rig further includes a rotating seat rotatably arranged on the vehicle frame through a horizontal shaft and a rotating seat rotation execution mechanism for driving the rotation of the rotating seat, and the support tower is fixed on the rotating seat.

8. The multi-angle soil-cement pile construction system in the subway tunnel according to claim 1 or 2 or 3, wherein, the cement mixer includes an upper mixing barrel for mixing cement, a feeding pipe arranged at the bottom of the upper mixing barrel, a first switching valve arranged on the feeding pipe, a cement slurry storage barrel located below the upper mixing barrel, and a discharge pipe arranged at the bottom of the cement slurry storage barrel. The cement slurry storage barrel is used for receiving the cement slurry discharged from the feeding pipe. The feeding pipeline includes a feeding input pipe connecting the inlet of the cement feeding pump and the discharge pipe, a feeding output pipe connected to the outlet of the cement feeding pump, and a plurality of branch pipelines. The branch pipelines correspond to the high-pressure jet grouting rigs of the pile unit one by one. One end of the branch pipeline is connected to the feeding output pipe, and the other end of the branch pipeline is connected to the cement injection port of the corresponding high-pressure jet grouting rig.

9. The multi-angle soil-cement pile construction system in the subway tunnel according to claim 1 or 2 or 3, wherein, the pile unit further includes a high-pressure jet grouting rig arranged on the installation platform for constructing vertical piles. Two high-pressure jet grouting rigs for constructing inclined piles are located on the same side of the high-pressure jet grouting rig for constructing vertical piles. The jet grouting drill rod of the high-pressure jet grouting rig for constructing vertical piles is vertically distributed, and a vertical through hole is provided on the installation platform. The jet grouting drill rod of the high-pressure jet grouting rig for constructing vertical piles passes through the vertical through hole. The jet grouting drill rod includes a drill body, and the drill body is composed of a plurality of connecting drill pipes connected in sequence.

10. The multi-angle soil-cement pile construction system in the subway tunnel according to claim 9, wherein, a drill pipe installation device is also provided on the installation platform on one side of the high-pressure jet grouting rig for constructing vertical piles. The drill pipe installation device includes a drill pipe placement rack and a manipulator arranged on the installation platform. The drill pipe placement rack is used for placing the connecting drill pipes of the jet grouting drill rod, and the manipulator is used for transporting and installing the connecting drill pipes on the drill pipe placement rack onto the jet grouting drill rod of the high-pressure jet grouting rig for constructing vertical piles, or for removing the connecting drill pipes on the jet grouting drill rod of the high-pressure jet grouting rig for constructing vertical piles and placing them on the drill pipe placement rack.

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