A device and method for rotary drilling of steep slope bridge pile foundation

Abstract

The present invention discloses a device and method for rotary drilling and forming holes for pile foundations of steep slope bridges, comprising a machine body, a drill bit controlled by the machine body, a positioning mechanism located around the drill bit, and a limiting mechanism connected to the positioning mechanism through an adjusting rod and a connecting rod; the device solves the problem of pile foundation construction in a steep slope environment, ensures construction safety, reduces repeated excavation and disturbance of the mountain body by pile foundation construction, improves engineering construction efficiency, and reduces the impact of construction waste on the surrounding environment; the rotary drilling and forming hole device can accurately determine the position of the side pile foundation relative to the supporting pile, and when rotary drilling and forming holes, it only needs to ensure that the actual position of the supporting pile is consistent with the set position, so that the rotary drilling process combined with the construction effect of the supporting pile can achieve the expected effect; and the auxiliary welding mechanism of the present invention can reasonably arrange the position of the steel beam and find the welding point when the relative position of the side pile foundation and the supporting pile is accurate, so as to further improve the stability of the side pile foundation.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary drilling for steep slope bridge pile foundations, and in particular relates to a device and method for rotary drilling for steep slope bridge pile foundations. Background Art

[0002] When constructing bridges on steep slopes, it is easy to encounter problems such as high groundwater levels in the mountains and local surface areas covered with unfavorable geological conditions such as landslides, collapses, and dangerous rocks, which seriously restricts the construction. The rotary drilling technology combined with support piles can effectively solve the problem of pile foundation construction in steep slope environments. However, during the construction process, the pile foundation position set on the steep slope is prone to deviation from the actual pile foundation position after construction, resulting in poor results of the rotary drilling technology combined with support piles. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention aims to provide a device and method for rotary drilling of steep slope bridge pile foundations.

[0004] The technical solution adopted by the present invention is:

[0005] A device for rotary drilling of steep slope bridge pile foundations, comprising a machine body, a drill bit controlled by the machine body, a positioning mechanism located around the drill bit, and a limiting mechanism connected to the positioning mechanism through an adjusting rod and a connecting rod;

[0006] The positioning mechanism includes a fixing ring, a control ring rotatably connected to the fixing ring and located inside the fixing ring, and a plurality of clamping assemblies penetrating and slidably arranged around the fixing ring, and the positioning mechanism is used to position the steel casing of the side pile foundation;

[0007] The limiting mechanism comprises a limiting ring and a connecting assembly slidably arranged on the limiting ring. The limiting mechanism limits the rotary drilling and hole-forming device by being sleeved on the peripheral side of the steel casing of the supporting pile.

[0008] As a preferred embodiment of the present invention, the adjusting rod and the connecting rod are slidably connected at one end close to each other, the adjusting rod at one end away from the connecting rod is connected to the fixing ring via a connecting seat, and the connecting rod at one end away from the adjusting rod is connected to the connecting assembly.

[0009] As a preferred embodiment of the present invention, the clamping assembly includes a limit column, which passes through and is slidably connected to the fixing ring, a guide plate is fixedly provided at one end of the limit column close to the side pile foundation steel casing, a guide pin is fixedly provided on one side of the limit column, a reinforcing rib is fixedly provided on the side of the limit column away from the guide pin, and the end of the reinforcing rib away from the limit column is fixedly connected to the guide plate; a plurality of arc grooves distributed in a circumferential array are provided on the control ring, and the plurality of arc grooves cooperate one by one with the plurality of guide pins.

[0010] As a preferred embodiment of the present invention, an end face gear ring is fixedly provided on one side of the control ring, a control motor is fixedly provided on the fixed ring, a gear column is fixedly provided on the output shaft of the control motor, and the gear column is meshed with the end face gear ring.

[0011] As a preferred embodiment of the present invention, the guide plate includes a smooth portion and a wedge-shaped portion fixedly connected together, a plurality of the smooth portions together form a cylindrical ring, and a plurality of the wedge-shaped portions together form a conical ring, and the diameter of the conical ring gradually increases from one end close to the cylindrical ring to the other end.

[0012] As a preferred embodiment of the present invention, a protective cover is provided on the circumference of the fixing ring, and the protective cover is used to cover the end of the limiting column away from the guide plate, the fixing ring, the control motor and the control ring.

[0013] As a preferred embodiment of the present invention, a mounting groove is provided on one side of the adjusting rod, and the mounting groove is used to install a scale; the connecting assembly includes a connecting block, a fixing buckle fixedly connected to the connecting block, and a mounting buckle matched with the fixing buckle, the mounting buckle and the fixing buckle cooperate to form a clamping groove, and a mounting hole is provided on one side of the mounting buckle, and the mounting buckle and the fixing buckle are connected through the mounting hole; an annular groove is respectively provided on both sides of the limiting ring, and the clamping groove cooperates with the annular groove.

[0014] As a preferred embodiment of the present invention, it also includes an auxiliary welding mechanism, which includes a mounting sleeve, a rotating rod rotatably connected to the mounting sleeve, an adjusting sleeve slidably connected to the rotating rod, a mounting seat fixedly connected to the adjusting sleeve, and a fastening frame slidably connected to the mounting seat; the mounting sleeve is slidably connected to the connecting rod.

[0015] As a preferred embodiment of the present invention, a connecting ring is fixedly provided at one end of the rotating rod close to the mounting sleeve, a handle is fixedly provided on the connecting ring, a threaded rod is provided on the fastening frame, the threaded rod passes through the fastening frame, the threaded rod is rotatably connected to the fastening frame, and the threaded rod is threadedly connected to the mounting seat.

[0016] A method for rotary drilling of a steep slope bridge pile foundation comprises the following steps:

[0017] S1. Construction preparation: review and re-survey the geological conditions of the mountain near the pile location; remove dangerous rocks and soft soil near the pile location; equip with sufficient construction machinery and measuring instruments with qualified performance;

[0018] S2, construction measurement and layout: the position of the pile foundation is laid out on the mountain and marked. According to the distribution of pile positions, the passage path of transport vehicles, the size of the rotary drilling device, and the operating radius of the drill rig, the excavation line and position parameters of the construction platform are laid out between the pile foundations on the upper and lower slope sides;

[0019] S3. Excavation of construction platform: Use excavators and manual labor to excavate the construction platform from top to bottom and from outside to inside. After the excavation of the construction platform is completed, safety guardrails are set up on the side;

[0020] S4. Driving support piles: The support piles are drilled at intervals, and the hole openings are protected by the support pile steel casings at the holes near the ground. The support pile steel casings are retained after pouring concrete;

[0021] S5. Reinforcement of the side edges of the construction platform: After the construction of the support piles is completed, the construction platform is repaired and the side edges of the construction platform are compacted and reinforced;

[0022] S6. Construction of pile foundations on the upper and lower sides of a steep slope: using the rotary drilling device, first construct the pile foundation on the upper side of the slope, and then construct the pile foundation on the lower side of the slope; first install the limit mechanism on the supporting pile steel casing to determine the reference position of the rotary drilling device, then slide the adjusting rod and the connecting rod to find the set position of the side pile foundation steel casing, and finally use the positioning mechanism to position and calibrate the side pile foundation steel casing, and use the side pile foundation steel casing to protect the hole mouth near the ground.

[0023] The beneficial effects of the present invention are as follows: as a rotary drilling and hole-making device and method for steep slope bridge pile foundations, the present invention solves the problem of pile foundation construction in steep slope environments, ensures construction safety, reduces repeated excavation and disturbance of the mountain caused by pile foundation construction, improves engineering construction efficiency, and reduces the impact of construction waste on the surrounding environment; the position of the side pile foundation relative to the supporting pile can be accurately determined by the rotary drilling and hole-making device. When rotary drilling and hole-making, it is only necessary to ensure that the actual position of the supporting pile is consistent with the set position to achieve the expected effect of the rotary drilling process combined with the supporting pile construction effect; and the auxiliary welding mechanism of the present invention, when the relative position of the side pile foundation and the supporting pile is accurate, can reasonably arrange the position of the steel beam, find the welding point, and further improve the stability of the side pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] Figure 1 It is a structural schematic diagram of the rotary drilling and hole-forming device of the present invention;

[0026] Figure 2 The present invention Figure 1 Schematic diagram of the structure after the body is hidden;

[0027] Figure 3 The present invention Figure 2 A schematic diagram of a top view structure;

[0028] Figure 4 The present invention Figure 3 Schematic diagram of the AA direction structure;

[0029] Figure 5 The present invention Figure 2 Schematic diagram of the internal structure of the positioning mechanism;

[0030] Figure 6 The present invention Figure 2 A schematic diagram of the structure after the positioning mechanism is hidden;

[0031] Figure 7 The present invention Figure 6 Structural schematic diagram of the auxiliary welding mechanism;

[0032] Figure 8 The present invention Figure 6 A schematic diagram of the bottom structure of the connection component;

[0033] Fig. 9 It is a schematic flow diagram of the rotary drilling hole forming method of the present invention;

[0034] Fig.10 It is a schematic diagram of the side position structure of the slope side pile foundation and the supporting piles of the present invention;

[0035] Fig.11 It is a schematic diagram of the planar position structure of the slope side pile foundation and the supporting piles of the present invention;

[0036] Fig.12 It is a schematic diagram of the welding structure of a single slope side pile foundation, a supporting pile and a steel beam of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0039] Combine the following Figure 1-12The specific embodiment of the present invention is described, a device for drilling a hole in a steep slope bridge pile foundation comprises a machine body 11, a drill bit 12 controlled by the machine body 11, a positioning mechanism 14 located around the drill bit 12, and a limiting mechanism 17 connected to the positioning mechanism 14 through an adjusting rod 25 and a connecting rod 26;

[0040] The positioning mechanism 14 includes a fixing ring 19, a control ring 23 rotatably connected to the fixing ring 19 and located inside the fixing ring 19, and a plurality of clamping components penetrating and slidably arranged around the fixing ring 19. The positioning mechanism 14 is used to position the side pile foundation steel casing 13. After the positioning mechanism 14 positions the side pile foundation steel casing 13, excavation continues, the hole is cleaned after excavation, and the side pile foundation steel casing 13 is retained after subsequent pouring is completed.

[0041] The limiting mechanism 17 includes a limiting ring 27 and a connecting assembly 38 slidably arranged on the limiting ring 27. The limiting mechanism 17 limits the rotary drilling device by being sleeved on the peripheral side of the supporting pile steel casing 16. First, the supporting piles are excavated and arranged in a row. The supporting pile steel casing 16 is retained after the supporting piles are cast. The position of the side pile foundation steel casing 13 is accurately located according to the position of the supporting pile steel casing 16, and then the accurate position of the side pile foundation is determined.

[0042] Advantageously, the ends of the adjusting rod 25 and the connecting rod 26 that are close to each other are slidably connected, the end of the adjusting rod 25 that is away from the connecting rod 26 is connected to the fixing ring 19 through the connecting seat 24, and the end of the connecting rod 26 that is away from the adjusting rod 25 is connected to the connecting assembly 38. The adjusting rod 25 and the connecting rod 26 are detachable components, which can slide relative to each other after being spliced, and can be temporarily fixed by bolts, so as to quickly and conveniently find the set distance of the side pile foundation relative to the supporting pile.

[0043] Advantageously, the clamping assembly includes a limit column 21, which penetrates and is slidably connected to the fixing ring 19, a guide plate 20 is fixedly provided at one end of the limit column 21 close to the side pile foundation steel casing 13, a guide pin 33 is fixedly provided at one side of the limit column 21, a reinforcing rib 34 is fixedly provided at one side of the limit column 21 away from the guide pin 33, and the end of the reinforcing rib 34 away from the limit column 21 is fixedly connected to the guide plate 20; the control ring 23 is provided with a plurality of arc grooves 22 distributed in a circumferential array, and the plurality of arc grooves 22 are matched one by one with the plurality of guide pins 33. The clamping assembly can guide the placement of the side pile foundation steel casing 13 in a dispersed state.

[0044] Advantageously, an end face gear ring 30 is fixedly provided on one side of the control ring 23, a control motor 18 is fixedly provided on the fixing ring 19, a tooth column is fixedly provided on the output shaft of the control motor 18, and the tooth column is meshed with the end face gear ring 30. When the side pile foundation steel casing 13 is roughly placed at the target position, the end face gear ring 30 is driven to rotate by the control motor 18, so that the multiple clamping components are gathered together, thereby calibrating the final posture of the side pile foundation steel casing 13.

[0045] Advantageously, the guide plate 20 includes a smooth portion 32 and a wedge-shaped portion 31 fixedly connected together, a plurality of the smooth portions 32 together form a cylindrical ring, and a plurality of the wedge-shaped portions 31 together form a conical ring, the diameter of the conical ring gradually increasing from one end close to the cylindrical ring to the other end.

[0046] Advantageously, a protective cover is provided around the fixing ring 19, and the protective cover is used to cover the end of the limiting column 21 away from the guide plate 20, the fixing ring 19, the control motor 18 and the control ring 23. The protective cover is not shown in the figure, and the protective cover can protect the rotary drilling device from working normally in a dusty environment.

[0047] Advantageously, a mounting groove 29 is provided on one side of the adjusting rod 25, and the mounting groove 29 is used to install a scale; the connecting assembly 38 includes a connecting block 50, a fixing buckle 49 fixedly connected to the connecting block 50, and a mounting buckle 47 cooperating with the fixing buckle 49, the mounting buckle 47 and the fixing buckle 49 cooperate to form a slot 48, and a mounting hole 46 is provided on one side of the mounting buckle 47, and the mounting buckle 47 and the fixing buckle 49 are connected through the mounting hole 46; an annular groove 41 is respectively provided on both sides of the limiting ring 27, and the slot 48 cooperates with the annular groove 41. The scale can accurately read the wheelbase between the supporting pile and the side pile foundation. After adjusting to the set value, the side pile foundation steel casing 13 can be positioned on an arc by rotating the connecting assembly 38, as shown in the attached figure. Fig.11 As shown, by measuring and setting the straight lines where multiple side pile foundations are located in advance, the intersection of the two is the set position of the side pile foundation.

[0048] Advantageously, an auxiliary welding mechanism 15 is further included, the auxiliary welding mechanism 15 including a mounting sleeve 37, a rotating rod 44 rotatably connected to the mounting sleeve 37, an adjusting sleeve 39 slidably connected to the rotating rod 44, a mounting seat 36 fixedly connected to the adjusting sleeve 39, and a fastening frame 35 slidably connected to the mounting seat 36; the mounting sleeve 37 is slidably connected to the connecting rod 26. After the side pile foundation steel casing 13 is positioned and placed, the rotary drilling device is not removed temporarily, and after the side pile foundation is cast, the auxiliary welding mechanism 15 is used to weld the steel beam 51 between the side pile foundation and the supporting pile.

[0049] Advantageously, a connecting ring 45 is fixedly provided at one end of the rotating rod 44 near the mounting sleeve 37, a handle 40 is fixedly provided on the connecting ring 45, a threaded rod 43 is provided on the fastening frame 35, the threaded rod 43 penetrates the fastening frame 35, the threaded rod 43 is rotatably connected to the fastening frame 35, and the threaded rod 43 is threadedly connected to the mounting seat 36. The mounting seat 36 is composed of two inclined blocks welded to a square block, the square block is fixedly connected to the adjustment sleeve 39, the inclined block is slidably connected to the fastening frame 35, the threaded rod 43 is located between the two square blocks, and the two spaces divided by the threaded rod 43 can be used for work. The mounting seat 36 has an inclined surface on one side near the fastening frame 35, and the shape and specification of the steel beam 51 are not limited, as long as the strength requirements are met, and it can be a channel steel or an angle steel, both of which can be inserted between the mounting seat 36 and the fastening frame 35, and can be easily fixed in position.

[0050] A method for rotary drilling of a steep slope bridge pile foundation comprises the following steps:

[0051] S1. Construction preparation: review and re-survey the geological conditions of the mountain near the pile location; remove dangerous rocks and soft soil near the pile location; equip with sufficient construction machinery and measuring instruments with qualified performance;

[0052] S2, construction measurement and layout: the position of the pile foundation is laid out on the mountain and marked. According to the distribution of pile positions, the passage path of transport vehicles, the size of the rotary drilling device, and the operating radius of the drill rig, the excavation line and position parameters of the construction platform are laid out between the upper and lower slope pile foundations;

[0053] S3. Excavation of construction platform: Use excavators and manual labor to excavate the construction platform from top to bottom and from outside to inside. After the excavation of the construction platform is completed, safety guardrails are set up on the side;

[0054] S4, driving support piles: the support piles are drilled at intervals, and the support pile steel casing 16 is used to protect the hole opening near the ground. After pouring concrete, the support pile steel casing 16 is retained;

[0055] S5. Reinforcement of the side edges of the construction platform: After the construction of the support piles is completed, the construction platform is repaired and the side edges of the construction platform are compacted and reinforced;

[0056] S6. Construction of pile foundations on the upper and lower sides of a steep slope: using the rotary drilling device, first construct the pile foundation on the upper side of the slope, and then construct the pile foundation on the lower side of the slope; first install the limiting mechanism 17 on the supporting pile steel casing 16 to determine the reference position of the rotary drilling device, then slide the adjusting rod 25 and the connecting rod 26 to find the set position of the side pile foundation steel casing 13, and finally use the positioning mechanism 14 to position and calibrate the side pile foundation steel casing 13, and use the side pile foundation steel casing 13 to protect the hole mouth near the ground.

[0057] Working principle of the present invention:

[0058] First, based on the maximum operating radius of the drill rig of the rotary drilling device, determine the excavation line of the construction platform between the upper and lower slope pile foundations, and excavate the construction platform inward from this line. Second, use the rotary drilling device to drill a row of support piles at the outer edge of the construction platform. The length and diameter of the support piles are determined by comprehensive calculation based on the slope of the mountain, geological conditions, and the load-bearing conditions of the construction platform. Use the support piles to improve the lateral stability of the mountain, as well as to support and reinforce the construction platform. Third, move the rotary drilling device on the construction platform to carry out the construction of the upper slope pile foundation and the lower slope pile foundation in turn.

[0059] S1. Construction preparation

[0060] Review and re-investigate the geological conditions of the mountain near the pile location, and propose design optimization and change measures in a timely manner if there are large deviations or discrepancies with the design data;

[0061] Remove dangerous rocks and soft soil near the pile position;

[0062] Equipped with sufficient construction machinery, measuring instruments and other equipment with qualified performance;

[0063] Connect construction access roads and temporary water and electricity facilities, and build intercepting drainage ditches;

[0064] The quality of raw materials such as cement, sand, and steel bars used in construction is inspected and put into use after they pass the inspection; semi-finished products such as concrete and steel cages are produced and processed by prefabrication stations and transported to the site for production after they pass the inspection;

[0065] Concrete is transported using ground pump pipes, and the pumping pipeline of the concrete ground pump is installed.

[0066] S2. Construction measurement and setting out

[0067] Locate the location of the pile foundation on the mountain and mark it;

[0068] According to the distribution of pile positions, the passage of transport vehicles, the size of the rotary drilling device, the maximum operating radius of the drilling rig and other requirements, the excavation line and position parameters of the construction platform are marked out between the pile foundations on the upper and lower slopes. The side length of the construction platform should exceed the range of both ends of the pile position by 2-3m, and its width should cover the pile foundation on the upper slope and be no less than 8m.

[0069] S3. Excavation construction platform

[0070] The construction platform is excavated from top to bottom and from outside to inside by using an excavator in cooperation with manual labor. The slope of the inner side of the construction platform should be 1:0.75 for soil slopes and 1:0.5 for stone slopes. After the excavation is completed, the construction platform is leveled and compacted with a small compaction tool to ensure that the foundation bearing capacity is not less than 150kPa.

[0071] After the excavation of the construction platform is completed, a safety guardrail should be installed on the edge. The protection height should be not less than 1.2m and the depth of the vertical bar into the ground should be not less than 0.5m.

[0072] Configuration and positioning of rotary drilling device: Select crawler-type multifunctional intelligent rotary drilling device, i.e., machine body 11, and monitor and control the main machine power, rotary positioning and rotary reset, as well as parameters such as verticality and depth of drilling in real time during the drilling process, referring to the SWDN360 crawler rotary drilling machine of Sunward Intelligent. According to the design data and supplementary survey data, prepare single- and double-layer bottom drill bits, i.e., drill bit 12, as well as pick-type core drill bits, cone-type core drill bits, conical spiral drill bits and other machines to cope with different geological conditions. After the rotary drilling device is assembled and positioned on site, lock the drill rig to prevent it from sliding and shifting.

[0073] S4. Driving support piles

[0074] To ensure the stability of the pile mouth, a steel casing is first driven in. The wall thickness of the steel casing should be no less than 8mm and the inner diameter should be at least 200mm larger than the pile diameter. The steel casing can be buried by an excavator combined with manual excavation, with a burial depth of no less than 1.5m. Welded steel strips are used on the inside and outside of the steel casing to extend it to the elevation of the construction platform, and the inclination rate of the casing is controlled to be no more than 1%.

[0075] The length and diameter of the support piles are determined by comprehensive calculation based on the slope of the mountain, geological conditions, and the load-bearing conditions of the construction platform. The optional diameters of the support piles are 1.2m, 1.5m, and 1.8m, and the length is 12-18m. The positions of the support piles are continuously marked on the side of the construction platform, and the center spacing of the support piles should be 0.3-0.5m larger than their diameters; the top elevation of the support piles should be consistent with the construction platform.

[0076] The support piles are bored at intervals to prevent the pile holes from collapsing. A steel plate support pad with a thickness of not less than 3 cm is laid within the operating range of the rotary drilling device on the top of the construction platform to diffuse the foundation stress. The drill rod is adjusted to the set position before excavation. During the excavation process, the footage position, hole depth and other data are monitored in real time. The footage speed, number of hole sweeps and drilling tools are adjusted in time according to the geological conditions, and drilling records are kept; when the drill bucket is full, the drill rod is raised to unload the pile slag to a temporary pile, and then an excavator or loader is used to load the accumulated pile slag and sediment onto a dump truck and transport it to a designated location for treatment. After the drilling is completed, the hole is cleaned and the hole is tested.

[0077] The prefabricated steel cage is transported to the site for hoisting. The steel cage should be vertical during hoisting to prevent eccentric deformation. The steel cage is connected symmetrically with sleeves. After the extension is completed, the quality of the joints is checked. The percentage of sleeve joints should not be greater than 50% of the connection block. The steel cage should be lowered slowly and evenly.

[0078] The concrete pump conduit is made of steel pipe, with a diameter of 300m and a wall thickness of no less than 3mm. The conduit is connected with flange bolts, and a rubber ring can be installed at the interface to stop water. The length of the lowest conduit in the pile should be 4.5m. The conduit should be put into use after passing the pressure bearing, pull-out and air tightness tests. The distance between the bottom of the conduit and the bottom of the pile should be within 0.3-0.5m. After the steel cage and conduit are installed, check and clean the hole again.

[0079] The amount of the first batch of concrete should be enough to fill the pile hole to a position 1m or more from the bottom of the guide tube. During the process, the concrete should be poured continuously and slowly to the top of the casing. The guide tube should be lifted accordingly and its buried depth in the concrete should be controlled to be no less than 2m, but not more than 5m. After the pile is formed, the compressive bearing capacity test should be carried out.

[0080] S5. Side reinforcement of construction platform

[0081] After the construction of the supporting piles is completed, the steel casing of the pile hole should be retained and when its strength reaches the design value, the construction platform should be repaired and the slag should be removed. At the same time, the side edges and other locations of the construction platform should be compacted and reinforced to ensure that the bearing capacity of the construction platform foundation meets the requirements.

[0082] S6. Construction of pile foundation on the upper and lower sides of steep slopes

[0083] The same rotary drilling process is used for the construction of steep slope pile foundations, and the construction sequence is first the upper slope side pile foundation and then the lower slope side pile foundation. When drilling the upper slope side pile foundation, the elevation of the top surface of the steel casing should meet the requirement of exceeding the ground of the construction platform by more than 30cm to prevent the infiltration of ground debris, water flow, etc. When drilling the lower slope side pile foundation, it is advisable to drive the steel casing to 50cm above the design elevation of the top surface of the pile foundation, and the steel casing of the pile foundation can be welded with the hole steel casing retained by the supporting pile through channel steel or angle steel to improve the overall stability; the steel plate support pad is moved, and the supporting pile and the construction platform are used to jointly support the rotary drilling device, and the drilling should be advanced at a slow speed. After the concrete pouring is completed, for the pile foundation with exposed parts, the steel casing should be removed after the strength reaches the design value. If the upper slope side pile foundation does not reach the design elevation, the pile connection treatment can be carried out.

[0084] In the above step S6, the limit mechanism 17 is used to determine the reference position of the rotary drilling device, the adjusting rod 25 and the connecting rod 26 are used to find the set position of the slope side pile foundation, the positioning mechanism 14 is used to position and calibrate the side pile foundation steel casing 13, and finally the auxiliary welding mechanism 15 is used to weld and reinforce the side pile foundation steel casing 13 and the support pile steel casing 16.

[0085] When the rotary drilling and hole-forming device is in a non-working state, the limiting mechanism 17, the positioning mechanism 14 and the auxiliary welding mechanism 15 are in a disassembled state. When working, the limiting mechanism 17 is first installed on the supporting pile steel casing 16. A limiting ring 27 can be optionally installed from the top of the supporting pile steel casing 16, and a pad can be used at the bottom of the limiting ring 27 to stabilize it at a required height. Alternatively, a limiting ring 27 of a spliced ​​structure can be designed, and the limiting ring 27 can be fixed to the surrounding side of the supporting pile steel casing 16 by bolts.

[0086] After the limiting ring 27 is fixed, the connecting assembly 38 is installed on the limiting ring 27: one side of the fixing buckle 49 is suspended upward on the annular groove 41 of the limiting ring 27, and the mounting buckle 47 is installed from the bottom. The mounting buckle 47 and the fixing buckle 49 are spliced ​​through the mounting hole 46 by bolts. After splicing, the fixing buckle 49 and the mounting buckle 47 can slide relative to the limiting ring 27;

[0087] Connect the adjusting rod 25, the connecting rod 26 and the positioning mechanism 14, slide the adjusting rod 25 and the connecting rod 26, use the scale on the mounting groove 29 to find the set distance of the side pile foundation steel casing 13, and use bolts to temporarily fix the adjusting rod 25 and the connecting rod 26. By adjusting the position of the connecting assembly 38 relative to the limiting ring 27, the center of the positioning mechanism 14 is located at the position marked by the layout, that is, the set position of the side pile foundation steel casing 13, and further tighten the bolts at the mounting hole 46 to make the connecting assembly 38 not easy to slide relative to the limiting ring 27, which also plays a role of temporary fixation.

[0088] The side pile foundation of the side slope is excavated and the side pile foundation steel casing 13 is buried by manual and mechanical cooperation. The side pile foundation steel casing 13 is lifted and moved to the central position of the positioning mechanism 14 and then placed. During the placement process, multiple guide plates 20 are in a scattered state, the wedge-shaped portion 31 of the guide plate 20 plays a guiding role, and the smooth portion 32 of the guide plate 20 plays a role in stabilizing the posture, so that the position of the side pile foundation steel casing 13 is preliminarily determined.

[0089] Then start the control motor 18, the control motor 18 drives the gear column to rotate, and drives the end face gear ring 30 to rotate through meshing, the control ring 23 rotates with the end face gear ring 30, the position of the arc groove 22 changes, the guide pin 33 drives the added component to move, the multiple clamping components gather, and the multiple smooth parts 32 clamp the side pile foundation steel casing 13, so that the side pile foundation steel casing 13 is located in the center of the positioning mechanism 14; at this time, the longitudinal side surface of the axis of the side pile foundation steel casing 13 and the supporting pile steel casing 16 coincides with the adjusting rod 25 and the connecting rod 26, and the side pile foundation steel casing 13 has a precise position relative to the supporting pile steel casing 16; keep the horizontal position of the side pile foundation steel casing 13 unchanged, and bury it vertically to the specified depth.

[0090] After the pile is formed, the side pile foundation steel casing 13 and the closest supporting pile steel casing 16 are welded by channel steel or angle steel, that is, the steel beam 51; during welding, the auxiliary welding mechanism 15 is used to weld to the adjacent Fig.12 Status shown.

[0091] Slide the mounting sleeve 37, control the ring 2 mounting sleeve 37 to be located in the middle of the side pile foundation steel casing 13 and the supporting pile steel casing 16, and use bolts to temporarily fix the mounting sleeve 37 relative to the connecting rod 26, insert the steel beam 51 between the fastening frame 35 and the mounting seat 36, use the threaded rod 43 to clamp the steel beam 51, so that the midpoint of the steel beam 51 is located at the fastening frame 35, turn the handle 40, and rotate the connecting ring 45, the rotating rod 44, the adjusting sleeve 39, the mounting seat 36, the fastening frame 35 and the steel beam 51 together, until the two ends of the steel beam 51 contact the side pile foundation steel casing 13 and the supporting pile steel casing 16 respectively, and maintain the posture of the auxiliary welding mechanism 15;

[0092] After welding is completed, the threaded rod 43 is twisted to disassemble the fastening frame 35 and the mounting seat 36, and the limiting mechanism 17 is separated from the steel beam 51. Then the positioning mechanism 14, the adjusting rod 25, the connecting rod 26 and the limiting mechanism 17 are disassembled, and the rotary drilling device is stored and organized, or the next side pile foundation steel casing 13 is positioned, calibrated and constructed.

[0093] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A device for drilling holes in steep slope bridge pile foundations, characterized in that: It comprises a machine body, a drill bit controlled by the machine body, a positioning mechanism located around the drill bit, and a limiting mechanism connected to the positioning mechanism through an adjusting rod and a connecting rod; The positioning mechanism includes a fixing ring, a control ring rotatably connected to the fixing ring and located inside the fixing ring, and a plurality of clamping assemblies penetrating and slidably arranged around the fixing ring, and the positioning mechanism is used to position the steel casing of the side pile foundation; The limiting mechanism comprises a limiting ring and a connecting assembly slidably arranged on the limiting ring, and the limiting mechanism limits the rotary drilling and hole forming device by being sleeved on the peripheral side of the steel casing of the supporting pile; It also includes an auxiliary welding mechanism, which includes a mounting sleeve, a rotating rod rotatably connected to the mounting sleeve, an adjusting sleeve slidably connected to the rotating rod, a mounting seat fixedly connected to the adjusting sleeve, and a fastening frame slidably connected to the mounting seat; the mounting sleeve is slidably connected to the connecting rod.

2. The device for drilling a hole for a steep slope bridge pile foundation according to claim 1, characterized in that: The adjusting rod and the connecting rod are slidably connected at one end close to each other, the adjusting rod at one end away from the connecting rod is connected to the fixing ring through a connecting seat, and the connecting rod at one end away from the adjusting rod is connected to the connecting assembly.

3. The device for drilling holes for steep slope bridge pile foundation according to claim 2, characterized in that: The clamping assembly includes a limit column, which passes through and is slidably connected to the fixing ring. A guide plate is fixedly provided at one end of the limit column close to the side pile foundation steel casing, a guide pin is fixedly provided on one side of the limit column, and a reinforcing rib is fixedly provided on the side of the limit column away from the guide pin, and the end of the reinforcing rib away from the limit column is fixedly connected to the guide plate; a plurality of arc grooves distributed in a circumferential array are provided on the control ring, and the plurality of arc grooves cooperate with the plurality of guide pins one by one.

4. The device for drilling holes for steep slope bridge pile foundation according to claim 3, characterized in that: An end face gear ring is fixedly provided on one side of the control ring, a control motor is fixedly provided on the fixed ring, a gear column is fixedly provided on the output shaft of the control motor, and the gear column is meshed with the end face gear ring.

5. The device for drilling holes for steep slope bridge pile foundation according to claim 3, characterized in that: The guide plate includes a smooth portion and a wedge-shaped portion fixedly connected together, a plurality of the smooth portions together form a cylindrical ring, and a plurality of the wedge-shaped portions together form a conical ring, and the diameter of the conical ring gradually increases from one end close to the cylindrical ring to the other end.

6. The device for drilling holes for steep slope bridge pile foundation according to claim 4, characterized in that: A protective cover is provided on the circumference of the fixing ring, and the protective cover is used to cover the end of the limiting column away from the guide plate, the fixing ring, the control motor and the control ring.

7. The device for drilling holes for steep slope bridge pile foundation according to claim 1, characterized in that: A mounting groove is provided on one side of the adjusting rod, and the mounting groove is used to install a scale; the connecting assembly includes a connecting block, a fixing buckle fixedly connected to the connecting block, and a mounting buckle matched with the fixing buckle, the mounting buckle and the fixing buckle cooperate to form a clamping groove, and a mounting hole is provided on one side of the mounting buckle, and the mounting buckle and the fixing buckle are connected through the mounting hole; an annular groove is respectively provided on both sides of the limiting ring, and the clamping groove cooperates with the annular groove.

8. The device for drilling holes for steep slope bridge pile foundation according to claim 7, characterized in that: A connecting ring is fixedly provided on one end of the rotating rod close to the mounting sleeve, a handle is fixedly provided on the connecting ring, a threaded rod is provided on the fastening frame, the threaded rod penetrates the fastening frame, the threaded rod is rotatably connected to the fastening frame, and the threaded rod is threadedly connected to the mounting seat.

9. A method for drilling a hole in a steep slope bridge pile foundation, using a device for drilling a hole in a steep slope bridge pile foundation as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Construction preparation: review and re-survey the geological conditions of the mountain near the pile location; remove dangerous rocks and soft soil near the pile location; equip with sufficient construction machinery and measuring instruments with qualified performance; S2, construction measurement and layout: the position of the pile foundation is laid out on the mountain and marked. According to the distribution of pile positions, the passage path of transport vehicles, the size of the rotary drilling device, and the operating radius of the drill rig, the excavation line and position parameters of the construction platform are laid out between the pile foundations on the upper and lower slope sides; S3. Excavation of construction platform: Use excavators and manual labor to excavate the construction platform from top to bottom and from outside to inside. After the excavation of the construction platform is completed, safety guardrails are set up on the side; S4. Driving support piles: The support piles are drilled at intervals, and the hole openings are protected by the support pile steel casings at the holes near the ground. The support pile steel casings are retained after pouring concrete; S5. Reinforcement of the side edges of the construction platform: After the construction of the support piles is completed, the construction platform is repaired and the side edges of the construction platform are compacted and reinforced; S6. Construction of pile foundations on the upper and lower sides of a steep slope: using the rotary drilling device, first construct the pile foundation on the upper side of the slope, and then construct the pile foundation on the lower side of the slope; first install the limit mechanism on the supporting pile steel casing to determine the reference position of the rotary drilling device, then slide the adjusting rod and the connecting rod to find the set position of the side pile foundation steel casing, and finally use the positioning mechanism to position and calibrate the side pile foundation steel casing, and use the side pile foundation steel casing to protect the hole mouth near the ground.

Images