Continuous wall building foundation pit drilling machine

Abstract

The utility model discloses a continuous wall building foundation pit drilling machine, including frame and the drill bit part of installing in frame, drill bit part includes cylinder, cylinder's cutting tooth, cylinder drive arrangement. Under the cylinder is any number, all cylinders only have one rotation center axis, the frame rotates fixed two ends of the cylinder. When the drilling machine drills into the continuous wall building foundation pit, the cylinder rotation center axis is parallel with the center line of the continuous wall building foundation pit to be excavated. The drilling machine of the utility model is used in long strip building foundation pit excavation specially, and the excavation efficiency is high, and the excavation cost is low.

Description

Technical Field

[0001] This utility model relates to a construction machine, specifically a foundation pit drilling rig. Background Technology

[0002] In building construction, it is often necessary to build the foundation, which requires the excavation of the foundation pit.

[0003] For example, diaphragm walls are constructed around buildings. Diaphragm walls, also known as underground diaphragm walls, are underground continuous reinforced concrete structures formed by excavating a deep trench (excavating a building foundation pit) along the engineering axis and then pouring concrete into the excavated foundation pit. They are used for water interception, seepage prevention, load-bearing, and water retention.

[0004] Existing deep trench (building foundation pit) excavation machinery suffers from low construction efficiency. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a building foundation pit drilling rig and a continuous wall building foundation pit drilling rig.

[0006] The construction pit drilling rig includes a frame and a drill bit portion mounted on the frame; the drill bit portion includes at least one drum with a plurality of cutting teeth distributed around its outer periphery; and a drum drive device for providing power for the rotation of the drum.

[0007] With any number of rollers, all rollers have only one rotation center axis; The frame rotates and fixes both ends of the roller.

[0008] As described above in the construction pit drilling rig, the method of rotating and fixing both ends of the drum specifically involves using a mechanical arm on the frame to rotate and fix both ends of the drum.

[0009] As described above in the construction foundation pit drilling rig, the at least one roller is specifically one of the following: (1) There is only one roller; (2) It has 2-4 rollers, all of which are connected in series and arranged in a straight line; each roller has a robotic arm at both ends; The same robotic arm is used at the junction of two adjacent rollers.

[0010] As described above, in the construction pit drilling rig, the drive device includes components located at both ends of the drum and fixed to the rotating frame: A variable motor that generates rotational power through provided hydraulic power, specifically a variable cartridge motor; The gearbox connected to the variable motor and transmitting rotational power to the drum is specifically a planetary gearbox; the gearbox has a fixed part and a rotating part that rotates relative to the fixed part, the rotating part having a rotating housing that serves as the output power after gear shifting, and the fixed part and the rotating part being coaxial; wherein, the fixed part of the gearbox is fixed to the robotic arm, and the rotating housing is fitted into the inner cavity of the drum and fixed to the drum; The variable displacement motor is fixedly installed on the fixed part of the transmission, and the output rotor of the variable displacement motor is fitted into the transmission and outputs rotational power to the rotating part. The variable displacement motor generates rotational power through hydraulic oil in a hydraulic pipe. The hydraulic pipe passes through the upper end of the frame, through the robotic arm, and connects to the hydraulic oil interface of the variable displacement motor.

[0011] As described above, for a building foundation pit drilling rig, the starting point of drilling into the building foundation pit is considered the upper direction, the ending point of drilling into the building foundation pit is considered the lower direction, the two ends of the drum are considered the left and right directions, and the directions perpendicular to the left and right directions are considered the front and rear directions. The frame is positioned above the drill bit section.

[0012] As described above, in the construction pit drilling rig, when the drum rotates, the tooth tip trajectory of the cutting teeth will form a virtual circle, and all the virtual circles on the drum are connected to form a virtual cylinder; The diameter of the virtual circle is approximately equal to the cross-sectional width of the building foundation pit to be excavated. The length of the roller is at least 1.5 times the width of the cross section.

[0013] As described above, in the construction foundation pit drilling rig, several guide plates protruding from the frame are provided at the front and rear of the frame; the surface of the guide plate is parallel to the virtual tangent plane, which is tangent to the virtual cylindrical surface; the upper and lower ends of the guide plate are boat-shaped and roll inward toward the frame side. The frame includes a box body composed of six planes; the robotic arm is a box plate extending downward from the left and right sides of the box body; the distance between the front and rear walls of the box body is less than the diameter of the virtual circle; the center line of the box body is parallel to the rotation center axis and coincides in the vertical direction; and several guide plates are provided on the front and rear walls of the box body.

[0014] As described above, in the construction foundation pit drilling rig, the upper part of the frame is a lifting seat, which is fixed to the frame. The lifting seat has lifting holes that are adapted to the connecting rod. The lifting seat is used to connect the drilling rig through the connecting rod. The drilling rig, in conjunction with the connecting rod, is used to lift, lower, and move the drilling rig.

[0015] This utility model discloses a drilling rig for continuous wall construction foundation pits, comprising a frame and a drill bit portion mounted on the frame; the drill bit portion includes at least one drum with several cutting teeth distributed around its outer circumference; and a drum drive device for providing power for the rotation of the drum. With any number of drums, all drums share only one central axis of rotation. When the drilling rig drills into the foundation pit of a diaphragm wall structure, the rotation center axis is parallel to the center line of the diaphragm wall foundation pit to be excavated; the frame rotates and fixes both ends of the drum. When the drum rotates, the tooth tip trajectory of the cutting teeth will form a virtual circle, the diameter of which is approximately equal to the cross-sectional width of the foundation pit to be excavated; the length of the drum is 1.5 times or more the width.

[0016] Beneficial technical effects: This utility model of drilling rig is patented for excavating long and narrow building foundation pits, with high excavation efficiency and low excavation cost.

[0017] The drilling rig of this invention has high construction efficiency and low excavation cost for the construction of foundation pits for continuous wall buildings. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the drilling rig of this utility model; Figure 2 This is a schematic diagram of the frame structure and the number of drums in another example of the drilling rig of this utility model; Figure 3 This is a schematic diagram of the drilling rig of this utility model installed on the drilling vehicle; Figure 4 This is a schematic diagram of the drum drive device of the drilling rig according to this utility model; Figure 5 This is an example of drilling rig excavation for continuous wall foundation pit according to this utility model; Figure 6 These are actual photos of the drilling rig of this utility model for reference.

[0019] The components include: 1. Roller; 2. Frame; 3. Robotic arm; 4. Hanger; 5. Guide plate; 6. Variable motor; 7. Cutting teeth; 8. Hydraulic oil pipe; 9. Lifting hole; 10. Drill rig; 11. Drill rod; 12. Excess soil spacer; 13. Output rotor; 14. Fixed part; 15. Rotating housing; 16. Planetary speed change gear set; 17. First section; 18. Pilot hole; 19. Cover. Detailed Implementation

[0020] For ease of description and understanding by those skilled in the art, the terms "up," "down," "left," and "right" are used to indicate direction in the description of the examples. Specifically, taking the normal operating state of the drilling rig, vertically downward drilling perpendicular to the ground surface as a reference, "upper" refers to the starting point of drilling into the foundation pit (i.e., the ground surface), and "lower" refers to the ending point of drilling into the foundation pit (the bottom of the foundation pit). The two ends of roller 1 are considered left and right, and directions perpendicular to the left and right are considered front and rear (corresponding to the orientation of the two walls on either side of the foundation pit). Further explanation: the orientation (length direction) of the continuous wall foundation pit is parallel to the left-right direction of roller 1, and the cross-sectional width is parallel to the front-back direction of roller 1. Of course, this orientation setting is based on the normal operating state of the drilling rig, vertically downward drilling. If the foundation pit to be drilled is not perpendicular to the ground surface but inclined to it, the orientation should be understood accordingly.

[0021] The width direction, as indicated in each description, refers to the direction parallel to the front-back direction; the length (or "direction") direction, as indicated in each description, refers to the direction parallel to the left-right direction.

[0022] The present invention relates to a construction foundation pit drilling rig, comprising a frame 2 and a drill bit portion mounted on the frame 2, the frame 2 being positioned above the drill bit portion. The drill bit portion includes at least one roller 1, with a plurality of cutting teeth 7 distributed around the outer periphery of the roller 1; and a roller 1 drive device for providing power for the rotation of the roller 1.

[0023] With any number of rollers 1, all rollers 1 have only one rotation center axis.

[0024] The frame 2 rotates and fixes the two ends of the roller 1.

[0025] Example 1: Rack 2.

[0026] One example is that frame 2 is the same frame, and the main function of frame 2 is to install roller 1. Therefore, the structure of frame 2 is not limited. It is composed of multiple steel structural components welded or screwed together. The steel structural components can be steel plates, angle steel, square steel, I-beams or combinations thereof.

[0027] Since the frame 2 needs to follow the roller 1 into the soil (in the pit), the width dimension of the frame 2 must not exceed the size of the pit drilled by the roller 1, otherwise it will get stuck in the pit. However, the length dimension should not exceed the roller 1 by too much. The optimal length dimension of the frame 2 is to set up the robotic arm 3 with the minimum structure that can withstand the impact of the work and the minimum space for installing the drive device.

[0028] The upper part of the frame 2 is the lifting base 4, which is fixed to the frame 2. The lifting base 4 has a lifting hole 9 that matches the connecting rod. The lifting base 4 is used to connect the drilling rig 10 through the connecting rod. The drilling rig 10, in conjunction with the connecting rod, is used to lift, lower, and move the drilling rig. Typically, the lower end of the connecting rod has a pin hole, which matches the lifting hole 9 of the lifting base 4. After inserting the pin, the frame 2 and the connecting rod can be fixed. The drilling rig 10 is usually a tracked rotary drilling rig, such as the KR60A integral transport rotary drilling rig 10 provided by Jiangxi Taixin Machinery Co., Ltd. It has a hydraulic pump to provide hydraulic oil power to the variable motor 6, a drill rod 11 (also referred to as the connecting rod in this example), and a control mechanism for lifting the connecting rod.

[0029] The frame 2 extends the robotic arm 3 downwards. If there is one roller 1, the robotic arms 3 extend downwards from both ends of the frame 2. If there are two or more rollers 1, the robotic arm 3 also needs to extend downwards from the middle of the frame 2.

[0030] Guide plate 5.

[0031] Guide plates 5 protruding from the front and rear of the frame 2 are provided. The function of the guide plates 5 is to gently press against the pit wall as the frame 2 slides down in the pit following the drilling of the drum 1, so that the frame 2 can slide smoothly downwards. During this process, the frame 2 is kept in the center of the pit without tilting forward or backward (the left and right central axis of the frame 2 coincides with the center line of the continuous wall building pit in the vertical projection), so that the drilling out of the pit is not deviated.

[0032] Therefore, multiple guide plates 5 should be installed in the front and rear directions of the frame 2 (for example, three guide plates 5 evenly spaced from left to right), or one guide plate 5 with a length two-thirds of the length of the frame 2 should be installed in the front and rear directions of the frame 2. In order to complete the guiding function, the guide plate 5 should lightly touch the pit wall to make the frame 2 slide smoothly downward. For this purpose, the surface of the guide plate 5 should be parallel to the pit wall. Specifically, when the roller 1 rotates, the tooth tip trajectory of the cutting tooth 7 will form a virtual circle, and all the virtual circles on the roller 1 will connect to form a virtual cylinder; it has a tangent surface to the surface of the virtual cylinder. The surface of the guide plate 5 is parallel to the tangent surface (the tangent surface is actually parallel to the pit wall).

[0033] The top and bottom ends of the guide plate 5 are boat-shaped, rolling inwards towards the frame 2 to facilitate sliding along the pit wall without getting stuck. The height of the guide plate 5 surface (parallel to the cut surface) can be set to 300-400mm, and the inward rolling angle of the boat-shaped edges is 45 degrees. If multiple guide plates 5 are used, the length of each guide plate 5 can be 300-500mm. The back of the guide plate 5 (near the frame 2) is welded to the frame 2 via connecting stiffeners.

[0034] One preferred example is that the frame 2 is a housing consisting of six planes (top, bottom, front, back, left, and right). The robotic arm 3 is a box-shaped plate extending downwards from the left and right sides of the housing (if there are multiple rollers 1, the middle section should also extend downwards). The box-shaped plate has hollow internal grooves for the passage of hydraulic hoses, see reference. Figure 1 The hydraulic hose enters the housing from the top, then exits from the right side and enters the hollow internal groove of the housing plate of robotic arm 3, before connecting downwards to the variable displacement motor. To prevent dust accumulation, the hollow internal groove of the housing plate needs to be covered by a cover 19, as shown in the reference. Figure 4 .

[0035] The distance between the front and rear walls of the housing is less than the diameter of the virtual circle, because the width dimension of the frame 2 cannot exceed the size of the pit drilled by the roller 1. The centerline of the housing is parallel to the axis of rotation and coincides with it in the vertical direction.

[0036] Several guide plates 5 are disposed on the front and rear walls of the housing. Of course, in the case where the frame 2 is a housing, it is also possible not to install separate guide plates 5, and to use the entire front and rear walls of the housing as guide plates 5. However, if the area of ​​the guide plate 5 is too large, it will increase the friction, so it is not the best example; or the front and rear walls of the housing may protrude as guide plates 5, which increases the processing cost, so it is also not the best example.

[0037] Example 2: Roller 1.

[0038] One example is a configuration with 2, 3, or 4 rollers 1, all connected in series and coaxially in a straight line; each roller 1 has a robotic arm 3 at both ends. At least one or both ends of each roller 1 are equipped with a variable displacement motor 6 and a gearbox. The same robotic arm 3 is used at the junction of two adjacent rollers 1, but alternatively, each roller can use its own robotic arm. A schematic diagram with 2 rollers 1 is provided in the figure.

[0039] One preferred example is a single roller 1. The length of roller 1 is approximately the same as the length of frame 2 (the length of frame 2 exceeds the length of the robotic arms 3 on both sides).

[0040] Several cutting teeth 7 are distributed around the outer circumference of the roller 1. The cutting teeth 7 can be distributed in a spiral or in a straight line around the outer circumference of the roller 1. In particular, the cutting teeth 7 near both ends of the roller 1 should be aligned with the edge of the end face of the roller 1 so that the cutting range covers the entire roller 1. The rows of cutting teeth 7 are staggered.

[0041] When the roller 1 rotates, the trajectory of the cutting teeth 7 forms a virtual circle, and all the virtual circles on the roller 1 connect to form a virtual cylinder. The diameter of the virtual circle is approximately equal to the cross-sectional width of the foundation pit to be excavated. This allows the roller 1 to directly expand and excavate a foundation pit of standard width in one up-and-down motion. Therefore, the diameter of the roller 1 should be equal to (or approximately equal to, because the pit wall will have rough edges) the width of the foundation pit to be formed, minus twice the installation height of the cutting teeth 7 (there are cutting teeth 7 at both the front and back of the roller 1). For example, if the width of the foundation pit to be formed is 600mm and the installation height of a single cutting tooth 7 is 60mm, then the diameter of the roller 1 should be 500-520mm (preferably 508mm). Other foundation pit widths include 800mm, 1000mm, and 1200mm, and the diameter of the roller 1 should be calculated accordingly. The installation height of the cutting teeth 7 is the distance from the tip of the cutting tooth 7 to the surface of the roller 1.

[0042] The length of the roller 1 is at least 1.5 times the width (cross-sectional width of the continuous wall foundation pit to be excavated). For example, the frame 2 (plus two robotic arms 3) is 3100mm long, and the roller 1 is 2800mm long. The design principle of the roller 1 length is as follows: When drilling pilot holes 18 at the foundation pit to be formed (refer to Example 5), the length of the roller 1 should exactly cover all the remaining soil gaps 12 between the pilot holes 18 (refer to Example 5); for example, if three pilot holes 18 are drilled, there will be three remaining soil gaps 12 between the three pilot holes 18, and the length of the roller 1 should cover these three remaining soil gaps 12. The formula is as follows: In the formula, L is the length of roller 1, a is the number of pilot holes 18, φ is the diameter of pilot hole 18, and h is the soil spacing 12 (the spacing between the outer circles of pilot holes 18).

[0043] For example, if the width of the foundation pit is 600mm, the diameter of each pilot hole is 600mm, and the spacing of the remaining soil is 12300mm, then the length of roller 1 should be greater than 2700mm. Considering the margin, the preferred length of roller 1 is 2800mm.

[0044] Roller 1 is a cylinder made of rolled steel plate (or commercially available round steel cylinder), with a hollow center and reinforcing ribs.

[0045] Example 3: Drum 1 power configuration.

[0046] The roller 1 is rotated and fixed at both ends by the mechanical arm 3 of the frame 2, and the drive device is set at both ends of the roller 1 and the rotating and fixed part of the frame 2.

[0047] One example is that the drum 1 is fixed to the frame 2 at both ends by bearings. The frame 2 has a shaft that passes through the center of the drum 1, and the shaft has bearings and is fitted onto the drum 1. An external rotor brushless permanent magnet motor is then installed inside the drum 1. The inner stator shaft of the motor is fixed to the frame 2 shaft to prevent it from rotating; the outer rotor of the motor is fixed to the inner wall of the drum 1, thus driving the drum 1 to rotate. Power is supplied to the motor by pulling a power cable from the drilling rig 10 along the drill rod 11, frame 2, and robotic arm 3 into the drum 1. However, due to insufficient motor power, poor impact resistance, and unfavorable operation in humid environments, this scheme is not preferred.

[0048] A preferred example is hydraulic drive. In addition to the hydraulic pump on the drilling rig 10, the drive unit should also include a variable displacement motor 6 and a transmission.

[0049] The variable motor 6 is used to convert the hydraulic power provided on the drilling rig 10 into rotational power, specifically a variable cartridge motor; for example, the A6VE variable cartridge motor provided by Bosch Rexroth.

[0050] The gearbox connected to the variable motor 6 and transmitting rotational power to the roller 1 is specifically a planetary gearbox, such as the Rexroth GFT60W3 travel gearbox; this gearbox is efficiently compatible with the A6VE variable cartridge motor.

[0051] The planetary gear reducer has a fixed part 14 and a rotating part that rotates relative to the fixed part 14. The fixed part 14 and the rotating part are mounted together by bearings. The rotating part has a rotating housing 15 that serves as the output power after speed change. The fixed part 14 and the rotating part are coaxial.

[0052] The fixed part 14 of the planetary reducer is fixed to the robotic arm 3. The fixed part 14 has a flange. The robotic arm 3 also has a matching flange facing the roller 1, which is fastened by flange bolts.

[0053] The rotating housing 15 is fitted into the inner cavity of the roller 1 and fixed to the roller 1. The rotating housing 15 also has a flange, and a matching flange is also provided at the corresponding position in the inner cavity of the roller 1, which is fastened by flange bolts.

[0054] The variable motor 6 is fixedly installed on the fixed part 14 of the planetary reducer. The output rotor 13 of the variable motor 6 is fitted into the input gear sleeve of the planetary reducer to provide rotational power to the input gear sleeve of the planetary reducer. The input gear sleeve transmits the power to the rotating housing 15 and then to the roller 1 through the planetary gear set 16.

[0055] The rotary drilling rig 10 has a hydraulic pump that can provide hydraulic oil. The hydraulic oil pipe 8 starts from the hydraulic pump of the rotary drilling rig 10, passes through the drill rod 11, passes through the frame 2, and goes into the robotic arm 3. It is connected to the hydraulic oil interface of the variable motor 6. The variable motor 6 generates rotational power through the hydraulic oil in the hydraulic oil pipe 8.

[0056] Example 4: As a dedicated drilling rig for diaphragm wall construction pits, it is required that when the drilling rig is drilling into the diaphragm wall construction pit, the rotation center axis of the drum 1 should be parallel to the center line of the direction of the diaphragm wall construction pit to be excavated, where the direction is the length direction of the diaphragm wall.

[0057] The trajectory of the cutting tooth 7 will form the diameter of a virtual circle, which is approximately equal to the cross-sectional width of the continuous wall foundation pit to be excavated. The length of the roller 1 is sufficient to cover the remaining soil gaps 12 between all the pilot holes 18.

[0058] Therefore, when roller 1 goes down one stroke, a foundation pit with the same width as the required foundation pit for the continuous wall will be obtained in the soil layer; by drilling in this segmented manner, a foundation pit for the continuous wall with unlimited length can be constructed.

[0059] Example 5: Work example.

[0060] Excavate a continuous wall foundation pit with a width of 600mm and an unlimited length.

[0061] Beginning: First, use an auger to drill four pilot holes 18 with a diameter of 600mm each, meeting the design requirements, on the ground. The spacing between adjacent pilot holes 18 is 300mm (not a central spacing, but a circumferential spacing), meaning the central spacing between adjacent pilot holes 18 is 900mm. The remaining soil layer between adjacent pilot holes 18 is the so-called surplus soil interval 12. The centers of each pilot hole 18 are located along the centerline of the continuous wall foundation pit to be excavated. Remove the auger. With the rotation center axis of the drum 1 of the construction foundation pit drilling rig of this utility model parallel to the center line of the foundation pit and coinciding in the longitudinal projection, and with the two ends of the drum 1 roughly at the center of the leftmost and rightmost pilot holes 18, the drum 1 will cover all the remaining soil gaps 12. The drum 1 is started to drill down, and the cutting teeth 7 of the drum 1 will expand and brush the soil layer, expanding and brushing all the remaining soil gaps 12 between each pilot hole 18. The excess soil will fall into the pilot holes 18, and the four pilot holes 18 will be connected to form a groove with a width of 600mm, which serves as the first section 17 of the continuous wall foundation pit.

[0062] Further drilling: Drill three more pilot holes 18 along the centerline of the foundation pit. The first pilot hole 18 is located 17300mm away from the first section of the foundation pit (not a central interval, but an outer circumferential interval). This will form three pilot holes 18 and three excess soil intervals 12. Remove the auger drill. Align the rotation center axis of the drum 1 of this utility model with the centerline of the foundation pit and make them coincide in the longitudinal projection. With one end of the drum 1 approximately at the center of the last pilot hole 18, the drum 1 will cover all the excess soil intervals 12. Start drilling with the drum 1. The cutting teeth 7 of the drum 1 will expand and brush the soil layer, expanding and brushing all the excess soil intervals 12 between each pilot hole 18. Excess soil will fall into the pilot holes 18, forming a 600mm wide groove that connects to the first section 17, serving as the second section of the continuous wall foundation pit. By connecting in this way, the excavation length of the continuous wall foundation pit is unlimited.

[0063] To ensure that excess soil falls into the pilot holes during the full expansion of the diaphragm wall, the pilot holes can be drilled to a depth exceeding the required depth for the diaphragm wall, thus accommodating more soil. Alternatively, excess soil can be removed from the ground using an excavator during the expansion process.

[0064] The above is an illustrative example and does not represent the scope of protection of this utility model.

[0065] The above provides multiple examples, which can be combined to create new examples. However, since each example also contains its own examples, the cross-combination of these examples may result in examples that violate the design concept of this utility model. If this is the case, such combinations of examples that violate the design concept should be avoided, and combinations of examples that do not violate the design concept should be adopted instead.

Claims

1. A construction pit drilling rig, comprising a frame and a drill bit portion mounted on the frame; the drill bit portion includes at least one drum with a plurality of cutting teeth distributed around its outer periphery; and a drum drive device for providing power for the rotation of the drum; Its features are, With any number of rollers, all rollers have only one rotation center axis; The frame rotates and fixes both ends of the roller.

2. The building foundation pit drilling rig as described in claim 1, characterized in that, Specifically, the method of rotating and fixing both ends of the roller is to use a mechanical arm on the frame to rotate and fix both ends of the roller.

3. The building foundation pit drilling rig as described in claim 1, characterized in that, The at least one roller is specifically one of the following: (1) There is only one roller; (2) It has 2-4 rollers, all of which are connected in series to form a straight line; each roller has a robotic arm at both ends; The same robotic arm is used at the junction of two adjacent rollers.

4. The building foundation pit drilling rig as described in claim 1, characterized in that, The drive device includes components located at both ends of the drum and at the rotational fixing points of the frame: A variable motor that generates rotational power through provided hydraulic power, specifically a variable cartridge motor; The gearbox connected to the variable motor and transmitting rotational power to the drum is specifically a planetary gearbox; the gearbox has a fixed part and a rotating part that rotates relative to the fixed part, the rotating part having a rotating housing that serves as the output power after gear shifting, and the fixed part and the rotating part being coaxial; wherein, the fixed part of the gearbox is fixed to the robotic arm, and the rotating housing is fitted into the inner cavity of the drum and fixed to the drum; The variable displacement motor is fixedly installed on the fixed part of the transmission, and the output rotor of the variable displacement motor is fitted into the transmission and outputs rotational power to the rotating part. The variable displacement motor generates rotational power through hydraulic oil in a hydraulic pipe. The hydraulic pipe passes through the upper end of the frame, through the robotic arm, and connects to the hydraulic oil interface of the variable displacement motor.

5. The building foundation pit drilling rig as described in claim 1, characterized in that, The starting point of drilling into the building foundation pit is considered the top, and the ending point of drilling into the building foundation pit is considered the bottom. The two ends of the roller are considered the left and right sides, and the directions perpendicular to the left and right sides are considered the front and rear sides. The frame is positioned above the drill bit section.

6. The building foundation pit drilling rig as described in claim 5, characterized in that, When the roller rotates, the tooth tip trajectory of the cutting teeth will form a virtual circle, and all the virtual circles on the roller will connect to form a virtual cylinder; The diameter of the virtual circle is approximately equal to the cross-sectional width of the building foundation pit to be excavated. The length of the roller is at least 1.5 times the width.

7. The building foundation pit drilling rig as described in claim 6, characterized in that, The front and rear of the frame are provided with several guide plates protruding from the frame; they have a cross-section tangent to the virtual cylindrical surface; the surface of the guide plate is parallel to the cross-section; the upper and lower ends of the guide plate are boat-shaped and roll inward toward the frame side; The frame includes a box body composed of six planes; the robotic arm is a box plate extending downward from the left and right sides of the box body; the distance between the front and rear walls of the box body is less than the diameter of the virtual circle; the center line of the box body is parallel to the rotation center axis and coincides in the vertical direction; and several guide plates are provided on the front and rear walls of the box body.

8. The building foundation pit drilling rig as described in claim 5, characterized in that, The upper part of the frame is a lifting base, which is fixed to the frame. The lifting base has lifting holes that are compatible with the connecting rod. The lifting base is used to connect the drilling rig through the connecting rod. The drilling rig, in conjunction with the connecting rod, is used to lift, lower, and move the drilling rig.

9. Drilling rig for foundation pits in diaphragm wall construction. It includes a frame and a drill bit portion mounted on the frame; the drill bit portion includes at least one drum with a plurality of cutting teeth distributed around its outer periphery; and a drum drive device for providing power for the rotation of the drum. Its features are, With any number of rollers, all rollers have only one rotation center axis; When the drilling rig is drilling into the foundation pit of the diaphragm wall building, the rotation center axis is parallel to the center line of the direction of the foundation pit to be excavated. The frame rotates and fixes both ends of the roller.

10. The drilling rig for continuous wall construction foundation pits as described in claim 9, characterized in that, As the roller rotates, the trajectory of the cutting teeth tips will form a virtual circle. The diameter of the virtual circle is approximately equal to the cross-sectional width of the continuous wall foundation pit to be excavated; the length of the roller is 1.5 times or more the width.

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