Multifunctional drilling device for underground construction

Abstract

The invention discloses a multifunctional drilling device for underground construction, and belongs to the technical field of underground drilling equipment. The invention discloses a drilling machine which comprises a connecting piece, a rack, a supporting disc, a direction adjusting plate, a drill bit body, a hollow shaft rotationally arranged on the supporting disc in a sleeving mode, a reaming body fixedly arranged on the hollow shaft, a wall protecting frame rotationally arranged on the hollow shaft in a sleeving mode and a drill bit telescopic assembly arranged between the direction adjusting plate and the drill bit body. The drill bit direction adjusting assembly is arranged between the supporting disc and the direction adjusting plate, and the radial wall protecting power mechanism and the circumferential wall protecting power mechanism are used for driving the hole expanding wall protecting assemblies to work. The multifunctional drilling device suitable for underground construction is simple and reasonable in structure, can flexibly steer, drill and broach underground, and has the effect of protecting the hole wall of a pipeline hole.

Description

Technical Field

[0001] The invention mainly relates to the technical field of underground drilling equipment, and in particular to a multifunctional drilling device used for underground construction. Background Art

[0002] In the construction and maintenance of urban underground drainage pipelines, in order to minimize the impact on existing buildings on the ground, concealed construction is usually adopted, that is, a drilling rig is used to directly drill holes underground to form pipeline holes, and the pipelines to be arranged are pulled into the corresponding pipeline holes for underground layout, which is particularly suitable for medium-hard foundation soil. Although the existing technology has achieved concealed underground drilling, there are still certain defects: First, the existing drilling rigs can usually only drill straight pipeline holes underground, that is, it is impossible to achieve flexible steering drilling underground; second, the existing drilling rig device usually forms the pipeline hole in one time, and when encountering harder rock foundation soil, the drill bit will usually be stuck, that is, the existing drilling rig device is not suitable for drilling harder rock and soil; third, after the existing drilling rig device drills the softer foundation soil, it is easy to cause the pipeline hole wall to collapse due to the loose soil, that is, the existing drilling rig device cannot perform wall protection operations on the pipeline hole. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides a multifunctional drilling device suitable for underground construction, which has a simple and reasonable structure, can flexibly turn to drill and expand holes underground, and has the effect of protecting the hole walls of pipelines.

[0004] In order to solve the above problems, the solution proposed by the present invention is: a multifunctional drilling device for underground construction, including a connecting piece for connecting a pipeline, and a frame fixedly mounted on the connecting piece; it also includes: a supporting plate fixedly mounted on the frame, an adjusting plate, a drill body, a hollow shaft rotatably mounted on the supporting plate, a hole expansion body fixedly mounted on the hollow shaft, a wall protection frame rotatably mounted on the hollow shaft, a drill telescopic assembly installed between the adjusting plate and the drill body for retracting the drill body before turning to drilling, a drill adjusting assembly installed between the supporting plate and the adjusting plate for turning the drill body to drill, and a drill adjusting assembly installed on the wall protection frame and equidistantly spaced circumferentially. A plurality of hole-expanding wall-protecting assemblies distributed at intervals, a plurality of radial wall-protecting power mechanisms installed on the wall-protecting frame for driving the hole-expanding wall-protecting assemblies to work radially along the pipeline hole, a circumferential wall-protecting power mechanism installed between the frame and the wall-protecting frame for driving the hole-expanding wall-protecting assemblies to work circumferentially along the pipeline hole, a drilling power assembly installed on the direction-adjusting plate for driving the drill body to rotate to form a primary hole, and a hole-expanding power assembly installed between the frame and the hollow shaft for driving the hole-expanding body to rotate to form a pipeline hole; the number of the radial wall-protecting power mechanisms is equal to the number of the hole-expanding wall-protecting assemblies, and a plurality of the radial wall-protecting power mechanisms are matched one by one with a plurality of the hole-expanding wall-protecting assemblies;

[0005] Several of the hole expansion wall protection assemblies have the same structure, and all include: an arc-shaped guard plate, a guide sleeve C fixedly mounted on the concave side of the arc-shaped guard plate at one end, a guide sleeve D slidably mounted on the guide sleeve C at one end and fixedly mounted on the wall protection frame at the other end, an elastic element mounted on the outside of the guide sleeve D and with both ends freely contacting the arc-shaped guard plate and the wall protection frame respectively, and a traction rope connected to the arc-shaped guard plate at one end and passing through a wire hole provided on the wall protection frame at the other end.

[0006] Furthermore, the drill bit telescopic assembly includes: a hydraulic telescopic rod whose two ends are respectively connected to the adjustment plate and the drill bit body, a guide sleeve B which is sleeved on the outside of the hydraulic telescopic rod and fixedly mounted on the adjustment plate at one end, and a guide sleeve A which is fixedly mounted on the drill bit body at one end and slidably sleeved on the guide sleeve B at the other end.

[0007] Furthermore, the drill bit adjustment assembly includes: a transition plate, a connecting rod A whose two ends are respectively hingedly connected to the support plate and the transition plate, a Y-axis steering telescopic rod whose two ends are respectively hingedly connected to the support plate and the transition plate, a connecting rod B whose two ends are respectively hingedly connected to the transition plate and the adjustment plate, and a Z-axis steering telescopic rod whose two ends are respectively hingedly connected to the transition plate and the adjustment plate; the axis of the connecting rod A and the axis of the Y-axis steering telescopic rod are located in a plumb plane, parallel to each other and arranged along the X-axis direction, and the axis of the connecting rod B and the axis of the Z-axis steering telescopic rod are located in a horizontal plane, parallel to each other and arranged along the X-axis direction.

[0008] Furthermore, several of the radial wall protection power mechanism structures are equally spaced along the circumferential direction and have the same structure, and all include: a rotating shaft A and a rotating shaft B rotatably mounted on the wall protection frame and with axes parallel to each other, a traction gear fixedly mounted on the rotating shaft B, a traction column fixedly mounted on the traction gear for connecting the other end of the traction rope, and an incomplete gear and a sprocket fixedly mounted on the rotating shaft A; the incomplete gear is intermittently meshed with the traction gear for transmission, and several of the sprockets are connected by a synchronous chain, and one of the rotating shafts A is transmission-connected to the output shaft of a wall protection motor A fixedly mounted on the wall protection frame.

[0009] Furthermore, the circumferential wall protection power mechanism includes: an inner gear ring fixedly mounted on the inner side of the wall protection frame, a gear shaft A rotatably mounted on the frame and meshing with the inner gear ring for transmission, and a wall protection motor B fixedly mounted on the frame for driving the gear shaft A to rotate.

[0010] Furthermore, the reaming power assembly includes: an end cover shaft fixedly mounted on the end of the hollow shaft, an outer gear ring A fixedly sleeved on the outside of the end cover shaft, a gear shaft B rotatably mounted on the frame and externally meshing with the outer gear ring A for transmission, and a reaming motor fixedly mounted on the frame for driving the gear shaft B to rotate.

[0011] Furthermore, the drilling power assembly includes: an outer gear ring B fixedly mounted on the outside of the guide sleeve B, a gear shaft C rotatably mounted on the adjustment plate and meshing with the outer gear ring B for transmission, and a drilling motor fixedly mounted on the adjustment plate for driving the gear shaft C to rotate.

[0012] Furthermore, friction teeth are provided on the outer side wall of the reaming body and the front side wall close to the drill bit body.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: a multifunctional drilling device for underground construction of the present invention is provided with a drill telescopic assembly and a drill direction adjustment assembly, which work in coordination with each other to drive the drill body to drill holes in a straight line or curve underground to form a straight or curved primary hole; the hole expansion power assembly drives the hole expansion body to rotate so as to expand the primary hole and form a pipeline hole for placing the pipeline; the present invention is also provided with a hole expansion wall protection assembly that can impact and reinforce the hole wall of the pipeline hole, and the circumferential wall protection power mechanism and the radial wall protection power mechanism work together to drive the hole expansion wall protection assembly to work, thereby implementing circumferential uniform impact wall protection on the hole wall of the pipeline hole. It can be seen from this that the present invention is a multifunctional drilling device suitable for underground construction, which has a simple and reasonable structure, can flexibly turn to drill and expand holes underground, and has the effect of protecting the hole wall of the pipeline hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the structural principle of a multifunctional drilling device for underground construction.

[0015] Figure 2 It is a schematic diagram of the top view of the structural principle of the drill bit direction adjustment assembly of the present invention.

[0016] Figure 3 It is a schematic diagram of the structural principle of the radial wall protection power mechanism of the present invention.

[0017] Figure 4 yes Figure 1 A partial enlarged view of part A.

[0018] Figure 5 yes Figure 1 A partial enlarged view of part B.

[0019] In the figure, 10 is a connecting piece; 11 is a frame; 12 is a support plate; 13 is a direction adjustment plate; 14 is a drill body; 15 is a hollow shaft; 16 is a reamer body; 161 is a friction tooth; 17 is a wall guard; 170 is a wire hole; 21 is a hydraulic telescopic rod; 22 is a guide sleeve A; 23 is a guide sleeve B; 31 is a transition plate; 32 is a Y-axis steering telescopic rod; 33 is a connecting rod A; 34 is a Z-axis steering telescopic rod; 35 is a connecting rod B; 41 is an arc guard plate; 42 is a guide sleeve C; 43 is a guide sleeve B; 44 is a guide sleeve C; 45 is a guide sleeve B; 46 is a guide sleeve C; 47 is a guide sleeve B; 48 is a guide sleeve C; 49 is a guide sleeve B; 50 is a guide sleeve B; 51 is a guide sleeve C; 52 is a guide sleeve B; 53 is a guide sleeve B; 54 is a guide sleeve B; 55 is a guide sleeve B; 56 is a guide sleeve C; 57 is a guide sleeve B; 58 is a guide sleeve B; 59 is a guide sleeve C; 60 is a guide sleeve B; 61 is a guide sleeve B; 62 is a guide sleeve C; 63 is a guide sleeve B; 64 is a guide sleeve B; 65 is a guide sleeve B; 66 is a guide sleeve C; 67 is a guide sleeve B; 68 is a guide sleeve B; 69 is a guide sleeve B; 70 is a guide sleeve B; 71 is a guide sleeve B; 72 is a guide sleeve C; 73 is a guide sleeve B; 74 is a guide sleeve B; 75 is a guide sleeve B; 76 is a guide sleeve B; 77 is a guide sleeve B; 78 is a guide sleeve B; 3—guide sleeve D; 44—elastic element; 45—traction rope; 51—rotating shaft A; 52—rotating shaft B; 53—incomplete gear; 54—sprocket; 55—traction gear; 56—traction column; 57—synchronous chain; 58—wall protection motor A; 61—inner gear ring; 62—gear shaft A; 63—wall protection motor B; 71—end cover shaft; 72—outer gear ring A; 73—gear shaft B; 74—expansion motor; 81—outer gear ring B; 82—gear shaft C; 83—drilling motor. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 The left and right directions in the image are recorded as the X-axis direction. Figure 1 The up and down direction is recorded as the Z-axis direction, and the direction perpendicular to both the X-axis and the Z-axis is recorded as the Y-axis direction; the drilling process when the drill body 14 turns underground is recorded as steering drilling; the hole formed after the action of the drill body 14 is recorded as a primary hole, and the hole for placing the pipe formed after the action of the expansion body 16 is recorded as a pipe hole.

[0021] like Figures 1 to 5As shown, a multifunctional drilling device for underground construction of the present invention comprises a connecting piece 10 for connecting a pipeline, a frame 11 fixedly mounted on the connecting piece 10, a support plate 12 fixedly mounted on the frame 11, a direction adjustment plate 13, a drill body 14, a hollow shaft 15 rotatably mounted on the support plate 12, a hole expansion body 16 fixedly mounted on the hollow shaft 15, a wall protection frame 17 rotatably mounted on the hollow shaft 15, a drill telescopic assembly mounted between the direction adjustment plate 13 and the drill body 14 for retracting the drill body 14 before turning to drilling, a drill direction adjustment assembly mounted between the support plate 12 and the direction adjustment plate 13 for turning the drill body 14 to drill, and a drill head mounting plate 17 mounted on the wall protection frame 17. And a plurality of hole expansion wall protection components are evenly spaced around the periphery, a plurality of radial wall protection power mechanisms are installed on the wall protection frame 17 to drive the hole expansion wall protection components to work radially along the pipeline hole, a circumferential wall protection power mechanism is installed between the frame 11 and the wall protection frame 17 to drive the hole expansion wall protection components to work circumferentially along the pipeline hole, a drilling power component is installed on the adjustment plate 13 to drive the drill body 14 to rotate to form a primary hole, and a hole expansion power component is installed between the frame 11 and the hollow shaft 15 to drive the hole expansion body 16 to rotate to form a hole pipeline hole; the number of radial wall protection power mechanisms is equal to the number of hole expansion wall protection components, and a plurality of radial wall protection power mechanisms are matched one by one with a plurality of hole expansion wall protection components. During specific implementation, the connecting piece 10 is used to pull the underground pipeline to be arranged, the main part of the support plate 12 is cylindrical, and a rolling bearing is sleeved on the outer side thereof and is rotatably connected to the hollow shaft 15, the drill bit adjustment assembly is arranged inside the hollow shaft 15, and a rolling bearing is sleeved on the outer side of the hollow shaft 15 and is rotatably connected to the wall guard frame 17, so that the hollow shaft 15 and the wall guard frame 17 can rotate freely around the same axis; when the drill bit body 14 is drilling a hole in a straight line underground, the drill bit telescopic assembly is in the longest telescopic state, and the drill bit adjustment assembly is in the initial state, and the adjustment plate 13 is located in the YZ plane; when the drill bit body 14 needs to turn to drill underground, first start the drill bit telescopic assembly to put itself in the shortest state, that is, the drill bit body 14 is the shortest distance from the reaming body 16, and then start the drill bit adjustment assembly, so that the adjustment plate 13 and the axis of the reaming body 16 are obliquely intersected at a certain angle, and then the drilling power assembly drives the drill bit body 14 to rotate to implement steering drilling. Preferably, friction teeth 161 are provided on the outer side wall of the reaming body 16 and the front side wall close to the drill bit body 14, so as to achieve rapid cutting of the hole wall of the primary hole in the underground rock, thereby forming a pipeline hole.

[0022] See also Figure 1 and Figure 4Several hole expansion wall protection components have the same structure, all of which include: an arc-shaped guard plate 41, a guide sleeve C42 with one end fixedly mounted on the concave side of the arc-shaped guard plate 41, a guide sleeve D43 with one end slidingly mounted on the guide sleeve C42 and the other end fixedly mounted on the wall protection frame 17, an elastic element 44 mounted on the outside of the guide sleeve D43 and with both ends freely contacting the arc-shaped guard plate 41 and the wall protection frame 17 respectively, and a traction rope 45 with one end connected to the arc-shaped guard plate 41 and the other end passing through the wire hole 170 provided on the wall protection frame 17. During specific implementation, the radius of curvature of the arc-shaped guard plate 41 is slightly larger than the outer diameter of the expansion body 16, and several arc-shaped guard plates 41 move synchronously in the radial direction and are always located on the same circle; the total arc length composed of several arc-shaped guard plates 41 is not less than four-fifths of the circumference of the inner wall of the pipe hole; the elastic element 44 adopts a high-rigidity compression-resistant metal spiral spring and is always in a compressed state, and the radial wall protection power mechanism pulls or releases the traction rope 45, so that the arc-shaped guard plate 41 moves radially outward under the action of the elastic potential energy stored in the elastic element 44 to impact the hole wall of the pipe hole, thereby achieving a wall protection effect.

[0023] See also Figure 1 As a preferred embodiment, the drill telescopic assembly includes: a hydraulic telescopic rod 21 whose two ends are respectively connected to the direction adjustment plate 13 and the drill body 14, a guide sleeve B23 which is sleeved on the outside of the hydraulic telescopic rod 21 and fixedly mounted on the direction adjustment plate 13 at one end, and a guide sleeve A22 which is fixedly mounted on the drill body 14 at one end and slidably sleeved on the guide sleeve B23 at the other end. In specific implementation, the cylinder part of the hydraulic telescopic rod 21 is fixed on the direction adjustment plate 13, and its movable end is fixed on the bottom of the drill body 14; the guide sleeve B23 and the guide sleeve A22 have the function of starting the axis movement guide function on the one hand, and the function of protecting the hydraulic telescopic rod 21 on the other hand.

[0024] See also Figure 1 and Figure 2Preferably, the drill bit adjustment assembly includes: a transition plate 31, a connecting rod A33 whose two ends are hingedly connected to the support plate 12 and the transition plate 31 respectively, a Y-axis steering telescopic rod 32 whose two ends are hingedly connected to the support plate 12 and the transition plate 31 respectively, a connecting rod B35 whose two ends are hingedly connected to the transition plate 31 and the adjustment plate 13 respectively, and a Z-axis steering telescopic rod 34 whose two ends are hingedly connected to the transition plate 31 and the adjustment plate 13 respectively; the axis of the connecting rod A33 and the axis of the Y-axis steering telescopic rod 32 are located in a plumb plane, parallel to each other and arranged along the X-axis direction, and the axis of the connecting rod B35 and the axis of the Z-axis steering telescopic rod 34 are located in a horizontal plane, parallel to each other and arranged along the X-axis direction. In specific implementation, the Y-axis steering telescopic rod 32 and the Z-axis steering telescopic rod 34 can be selected from one or two of an electric telescopic rod, a hydraulic telescopic rod or a pneumatic telescopic rod; when the Y-axis steering telescopic rod 32 and the Z-axis steering telescopic rod 34 are in the shortest state, the length of the Y-axis steering telescopic rod 32 is equal to the length of the connecting rod A33, and the length of the Z-axis steering telescopic rod 34 is equal to the length of the connecting rod B35. The telescopic movement of the Y-axis steering telescopic rod 32 can push the transition plate 31 to rotate around the Y axis, thereby driving the drill body 14 to rotate around the Y axis; the telescopic movement of the Z-axis steering telescopic rod 34 can directly drive the drill body 14 to rotate around the Z axis; the Y-axis steering telescopic rod 32 and the Z-axis steering telescopic rod 34 can simultaneously telescope, so that the drill body 14 can achieve steering and hole rotation in a complex space.

[0025] See also Figure 1 and Figure 3 As a preferred embodiment, several radial wall protection power mechanism structures are equally spaced along the circumferential direction and have the same structure, and all include: a rotating shaft A51 and a rotating shaft B52 which are rotatably mounted on the wall protection frame 17 and whose axes are parallel to each other, a traction gear 55 which is fixedly mounted on the rotating shaft B52, a traction column 56 which is fixedly mounted on the traction gear 55 and is used to connect the other end of the traction rope 45, and a non-complete gear 53 and a sprocket 54 which are fixedly mounted on the rotating shaft A51; the non-complete gear 53 and the traction gear 55 are intermittently meshed and driven, and several sprockets 54 are connected by a synchronous chain 57, and one of the rotating shafts A51 is connected to the output shaft of the wall protection motor A58 which is fixedly mounted on the wall protection frame 17. In specific implementation, the ratio of the toothed arc length of the non-complete gear 53 to the total circumference is between one third and one fourth, so that the arc-shaped guard plate 41 in the hole expansion wall protection assembly has enough time to impact the inner wall of the pipeline hole, thereby playing a role in protecting the inner wall of the pipeline hole. The plurality of traction gears 55 rotate synchronously and pull the plurality of traction ropes 45 at the same time, so that the plurality of arc-shaped guard plates 41 compress the corresponding elastic elements 44 at the same time.

[0026] See also Figure 1As a preferred embodiment, the circumferential wall protection power mechanism includes: an inner gear ring 61 fixedly mounted on the inner side of the wall protection frame 17, a gear shaft A62 rotatably mounted on the frame 11 and meshing with the inner gear ring 61, and a wall protection motor B63 fixedly mounted on the frame 11 to drive the gear shaft A62 to rotate. In specific implementation, the gear shaft A62 has the same structural features as the gear shaft B73 and the gear shaft C82, and is integrally formed and consists of a transmission shaft and a transmission gear; the output shaft of the wall protection motor B63 is connected to the transmission shaft of the gear shaft A62, and the transmission shaft of the gear shaft A62 is rotatably connected to the frame 11 by a rolling bearing, and the transmission gear of the gear shaft A62 meshes with the inner gear ring 61. In specific application, the wall protection motor B63 drives the gear shaft A62 to rotate, and drives the wall protection frame 17 to rotate through the inner gear ring 61, so that a number of hole expansion wall protection components impact the pipeline hole in the circumferential direction to protect the wall.

[0027] See also Figure 1 As a preferred embodiment, the reaming power assembly includes: an end cap shaft 71 fixedly mounted on the end of the hollow shaft 15, an outer gear ring A72 fixedly sleeved on the outside of the end cap shaft 71, a gear shaft B73 rotatably mounted on the frame 11 and meshing with the outer gear ring A72, and a reaming motor 74 fixedly mounted on the frame 11 to drive the gear shaft B73 to rotate. In specific implementation, the transmission shaft of the gear shaft B73 is connected to the frame 11 by a rolling bearing, and is fixedly connected to the output shaft of the reaming motor 74, and the transmission gear of the gear shaft B73 meshes with the outer gear ring A72; the center of the end cap shaft 71 is provided with a through hole that allows the support plate 12 to pass through. In specific application, the reaming motor 74 drives the gear shaft B73 to rotate, drives the outer gear ring A72 and the end cap shaft 71 to rotate, and then drives the reaming body 16 to rotate through the hollow shaft 15, so as to expand the primary hole and form a pipeline hole.

[0028] See also Figure 1 and Figure 5 As a preferred embodiment, the drilling power assembly includes: an outer gear ring B81 fixedly sleeved on the outside of the guide sleeve B23, a gear shaft C82 rotatably mounted on the adjustment plate 13 and meshing with the outer gear ring B81, and a drilling motor 83 fixedly mounted on the adjustment plate 13 to drive the gear shaft C82 to rotate. In specific implementation, the transmission shaft of the gear shaft C82 is connected to the adjustment plate 13 in rotation by a rolling bearing, and is fixedly connected to the output shaft of the drilling motor 83, and the transmission gear of the gear shaft C82 meshes with the outer gear ring B81. In specific application, the drilling motor 83 drives the gear shaft C82 to rotate, driving the outer gear ring B81 and the drill body 14 to rotate, thereby forming a primary hole during underground construction.

[0029] The working process and working principle of the present invention are as follows: the drill bit direction adjustment assembly is in the initial state, the drill bit telescopic assembly works, so that the drill bit body 14 is farthest from the reaming body 16. The drilling motor 83 in the drilling power assembly works, driving the drill bit body 14 to drill quickly and form a primary hole; at the same time, the reaming motor 74 in the reaming power assembly works, driving the reaming body 16 to rotate at high speed, thereby expanding the primary hole and forming a pipeline hole; the wall protection motor A 58 drives the sprocket 54 to rotate, thereby driving the radial wall protection power mechanism to work, thereby causing the arc-shaped guard plate 41 in the reaming wall protection assembly to impact the inner wall of the pipeline hole with the wall protection; the wall protection motor B63 in the circumferential wall protection power mechanism works, driving the wall protection frame 17 and a plurality of reaming wall protection assemblies to rotate, thereby implementing circumferential uniform wall protection on the inner wall of the pipeline hole. When it is necessary to turn the drilling, the hydraulic telescopic rod 21 in the drill bit telescopic assembly pulls the drill body 14 to move in the direction of the reaming body 16, thereby making the drill bit telescopic assembly in the shortest state, and then the Y-axis steering telescopic rod 32 and the Z-axis steering telescopic rod 34 in the drill bit adjustment assembly work in coordination to adjust the azimuth angle of the adjustment plate 13 according to actual needs, that is, adjust the angle between the axis of the drill body 14 and the axis of the reaming body 16, and the drill body 14 enters the steering drilling state.

[0030] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should fall within the protection scope of the present invention.

Claims

1. A multifunctional drilling device for underground construction, comprising a connecting piece (10) for connecting a pipeline, and a frame (11) fixedly mounted on the connecting piece (10); characterized in that: Also includes: A support plate (12) fixedly mounted on the frame (11), a direction adjustment plate (13), a drill body (14), a hollow shaft (15) rotatably mounted on the support plate (12), a hole expansion body (16) fixedly mounted on the hollow shaft (15), a wall protection frame (17) rotatably mounted on the hollow shaft (15), a drill telescopic assembly mounted between the direction adjustment plate (13) and the drill body (14) for retracting the drill body (14) before turning to drill holes, a drill direction adjustment assembly mounted between the support plate (12) and the direction adjustment plate (13) for turning the drill body (14) to drill holes, a plurality of hole expansion wall protection assemblies mounted on the wall protection frame (17) and distributed at equal intervals in the circumferential direction, and a plurality of hole expansion wall protection assemblies mounted on the wall protection frame (17) and distributed at equal intervals in the circumferential direction. The wall protection frame (17) includes a plurality of radial wall protection power mechanisms for driving the hole expansion wall protection components to work radially along the pipeline hole, a circumferential wall protection power mechanism installed between the frame (11) and the wall protection frame (17) for driving the hole expansion wall protection components to work circumferentially along the pipeline hole, a drilling power component installed on the direction adjustment plate (13) for driving the drill bit body (14) to rotate to form a primary hole, and a hole expansion power component installed between the frame (11) and the hollow shaft (15) for driving the hole expansion body (16) to rotate to form a pipeline hole; the number of the radial wall protection power mechanisms is equal to the number of the hole expansion wall protection components, and the plurality of the radial wall protection power mechanisms are matched one by one with the plurality of the hole expansion wall protection components; Several of the hole expansion wall protection components have the same structure, and all include: an arc-shaped guard plate (41), a guide sleeve C (42) with one end fixedly mounted on the concave side of the arc-shaped guard plate (41), a guide sleeve D (43) with one end slidingly mounted on the guide sleeve C (42) and the other end fixedly mounted on the wall protection frame (17), an elastic element (44) mounted on the outside of the guide sleeve D (43) and with both ends freely contacting the arc-shaped guard plate (41) and the wall protection frame (17), and a traction rope (45) with one end connected to the arc-shaped guard plate (41) and the other end passing through a wire hole (170) provided on the wall protection frame (17).

2. A multifunctional drilling device for underground construction according to claim 1, characterized in that: The drill head telescopic assembly comprises: a hydraulic telescopic rod (21) whose two ends are respectively connected to the direction adjustment plate (13) and the drill head body (14), a guide sleeve B (23) sleeved on the outside of the hydraulic telescopic rod (21) and one end of which is fixedly mounted on the direction adjustment plate (13), and a guide sleeve A (22) whose one end is fixedly mounted on the drill head body (14) and the other end of which is slidably sleeved on the guide sleeve B (23).

3. A multifunctional drilling device for underground construction according to claim 1, characterized in that: The drill bit direction adjustment assembly comprises: a transition plate (31), a connecting rod A (33) whose two ends are respectively hingedly connected to the support plate (12) and the transition plate (31), a Y-axis steering telescopic rod (32) whose two ends are respectively hingedly connected to the support plate (12) and the transition plate (31), a connecting rod B (35) whose two ends are respectively hingedly connected to the transition plate (31) and the direction adjustment plate (13), and a Z-axis steering telescopic rod (34) whose two ends are respectively hingedly connected to the transition plate (31) and the direction adjustment plate (13); the axis of the connecting rod A (33) and the axis of the Y-axis steering telescopic rod (32) are located in a plumb plane, are parallel to each other, and are arranged along the X-axis direction, and the axis of the connecting rod B (35) and the axis of the Z-axis steering telescopic rod (34) are located in a horizontal plane, are parallel to each other, and are arranged along the X-axis direction.

4. A multifunctional drilling device for underground construction according to claim 1, characterized in that: The plurality of radial wall protection power mechanism structures are equally spaced along the circumferential direction and have the same structure, and all of them include: a rotating shaft A (51) and a rotating shaft B (52) which are rotatably mounted on the wall protection frame (17) and whose axes are parallel to each other, a traction gear (55) fixedly mounted on the rotating shaft B (52), a traction column (56) fixedly mounted on the traction gear (55) and used to connect the other end of the traction rope (45), and a non-complete gear (53) and a sprocket (54) fixedly mounted on the rotating shaft A (51); the non-complete gear (53) and the traction gear (55) are intermittently meshed and driven, and the plurality of sprockets (54) are connected by a synchronous chain (57); and one of the rotating shafts A (51) is drivingly connected to an output shaft of a wall protection motor A (58) fixedly mounted on the wall protection frame (17).

5. The multifunctional drilling device for underground construction according to claim 1, characterized in that: The circumferential wall protection power mechanism comprises: an inner gear ring (61) fixedly mounted on the inner side of the wall protection frame (17), a gear shaft A (62) rotatably mounted on the frame (11) and meshing with the inner gear ring (61) for transmission, and a wall protection motor B (63) fixedly mounted on the frame (11) for driving the gear shaft A (62) to rotate.

6. A multifunctional drilling device for underground construction according to claim 1, characterized in that: The hole-expanding power assembly comprises: an end cover shaft (71) fixedly mounted on the end of the hollow shaft (15), an outer gear ring A (72) fixedly sleeved on the outside of the end cover shaft (71), a gear shaft B (73) rotatably mounted on the frame (11) and meshingly transmitting with the outer gear ring A (72), and a hole-expanding motor (74) fixedly mounted on the frame (11) and driving the gear shaft B (73) to rotate.

7. The multifunctional drilling device for underground construction according to claim 1, characterized in that: The drilling power assembly comprises: an outer gear ring B (81) fixedly sleeved on the outside of the guide sleeve B (23), a gear shaft C (82) rotatably mounted on the adjustment plate (13) and meshing with the outer gear ring B (81) for transmission, and a drilling motor (83) fixedly mounted on the adjustment plate (13) for driving the gear shaft C (82) to rotate.

8. The multifunctional drilling device for underground construction according to claim 1, characterized in that: Friction teeth (161) are provided on the outer side wall of the reamer body (16) and the front side wall close to the drill body (14).

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