Bridge foundation soil layer construction drilling guide device

Abstract

The application discloses a bridge foundation soil layer construction drilling guide device and relates to the technical field of soil layer drilling construction. The drilling rod guide base is provided with a guide accommodating cavity, a centering cylinder for the passage of a drilling rod is installed in the guide accommodating cavity, and a centering mechanism for centering and guiding the drilling rod is installed on the centering cylinder. The centering mechanism comprises a centering rotating base. The centering rotating base is rotatably installed on a movable guide sleeve through a bearing. The centering rotating base and the movable guide sleeve are coaxially arranged and connected with the centering cylinder for the passage of the drilling rod. The guide device can guide and position the drilling rod of a pile machine, ensure the perpendicularity of the drilling rod during the drilling process of the pile machine, and can be recycled for multiple times to save the construction cost.

Description

Technical Field

[0001] This invention relates to the field of soil drilling construction technology, specifically a drilling guide device for bridge foundation soil construction. Background Technology

[0002] In the process of my country's transportation infrastructure construction, bridge engineering has always occupied a core position, and its construction scale and technical level are a direct reflection of the country's comprehensive strength. With the continuous and rapid economic development, the demand for the construction of bridges spanning rivers, seas, and complex mountainous terrains is increasing, which places more stringent standards on the load-bearing capacity, stability, and durability of bridge foundations.

[0003] As a crucial support for the overall structure of a bridge, the construction quality of the bridge foundation directly affects its service life and operational safety. Drilled pile foundations, with their excellent adaptability to various geological conditions, minimal environmental impact during construction, and strong load-bearing capacity, have become one of the most widely used foundation types in bridge construction. Industry statistics show that over 80% of the long-span bridges already built in my country utilize drilled pile foundations.

[0004] In recent years, with the continuous innovation of industrialized and intelligent building technologies, the field of soil drilling construction for bridge foundations has also ushered in new development opportunities. The construction mode has gradually shifted from traditional manual operation and experience-based judgment to mechanization, automation, and informatization. A series of advanced construction technologies and equipment have emerged, greatly improving construction efficiency and quality control.

[0005] Due to complex and varied geological conditions, when encountering mountainous areas or soft soil layers, pile foundation construction is adopted to ensure the foundation bearing capacity and stability of bridges. One of the important indicators of pile foundation is the verticality of the pile hole (drill hole). Therefore, in order to ensure the drilling "verticality" of the pile driver drill rod, a guiding device for the (pile driver drill rod) has been designed and invented. Summary of the Invention

[0006] The objective of this invention is achieved through the following technical solution: A drilling guide device for bridge foundation soil construction includes a drill rod guide base, the drill rod guide base having a through guide cavity, a centering cylinder for guiding the drill rod through the guide cavity, and a centering mechanism for centering and guiding the drill rod. The centering mechanism includes a centering rotating chassis; The centering rotating chassis is mounted on a through-hole movable guide sleeve via a bearing for rotational installation; The centering rotating chassis is connected to the movable guide sleeve, and the movable guide sleeve is used to connect to the centering cylinder and is coaxial with the centering cylinder for the drill pipe to pass through; The bottom end of the centering rotating chassis is connected to a rotating connecting cylinder, which is rotatably fitted onto the outer wall of the movable guide sleeve. The bottom end of the rotating connecting cylinder is used to connect with the rotating adjustment structure. The rotary adjustment structure is used for installation and connection with the centering cylinder; A centering movable seat is installed and connected to the top of the centering rotating chassis, and a plurality of centering movable components are installed and connected on the centering movable seat; The top of the centering movable seat is connected to a through-hole centering movable cylinder, and several centering movable parts are movably disposed in the centering movable cylinder; The centering movable seat has a movable channel for the drill rod to pass through, and the centering movable cylinder is coaxially arranged with the movable channel for the drill rod to pass through the centering movable seat; The movable channel for the drill pipe to pass through the centering movable seat is coaxially arranged with the rotating connecting cylinder.

[0007] Preferably, the rotating connecting cylinder passes through the centering rotating chassis via a bearing and is used to connect with the centering movable seat; The centering movable seat is provided with centering movable slots corresponding to a plurality of centering movable components, and the centering movable components are configured to be movable and limited with the centering movable seat through the centering movable slots; The bottom end of the rotating connecting cylinder is connected to the large rotating adjustment drive gear, which is rotatably connected to the centering cylinder via a bearing. The rotary adjustment drive gear is installed in the guide receiving cavity through which the drill pipe guide base is opened; The large rotating adjustment drive gear meshes with the small driving gear, the small driving gear is connected to the drive shaft, and the other end of the drive shaft rotates through the connecting disc and is used to connect to the output end of the rotating control servo motor. The connecting disc is used to connect with the centering cylinder, and the rotation control servo is used to install and fix in the guide receiving cavity that is opened through the drill pipe guide base.

[0008] Preferably, the centering movable component includes a centering movable slider; The centering movable slider and the centering movable groove are adapted to slide limit; The bottom end of the centering movable groove is provided with a centering movable channel opening; The bottom end of the centering movable slider and the end of the movable channel for the drill rod to pass through, which is opened away from the centering movable seat, is rotatably connected to a centering movable limiting block by a rotating pin. The centering movable limiting block is used to move through the centering movable channel opening opened through the bottom end of the centering movable groove. The top of the centering rotating chassis is provided with a centering sliding limiting groove that is arc-shaped and corresponds to the centering movable limiting block. The centering movable limiting block is placed in the centering sliding limiting groove and can move along the centering sliding limiting groove.

[0009] Preferably, the centering movable slider is connected to a centering movable jaw at one end near the movable channel for the drill rod to pass through, and the centering movable jaw is movably disposed in the centering movable cylinder; The top two sides of the centering movable slider are respectively connected to the centering movable guide rails, and the centering movable slider is used to slide and limit the connection with the top of the centering movable slot opened in the centering movable seat through the centering movable guide rails.

[0010] Preferably, a centering connector is connected to the top end of the centering movable cylinder; The top of the centering connector is used to connect with a through-hole telescopic sleeve through which the drill pipe passes via a movable mechanism. The movable telescopic sleeve is configured to communicate with the centering connector for the drill pipe to pass through.

[0011] Preferably, the end of the movable telescopic sleeve near the centering connector is connected to a centering movable head structure; The centering movable head structure has a movable channel, and the movable channel of the centering movable head structure is coaxially arranged with the movable telescopic sleeve for the drill pipe to pass through; The centering connector has a centering movable head seat structure connected in the through cavity at one end near the centering movable head structure. The centering movable head structure and the centering movable head seat structure are connected by a ball joint for movable limiting. The centering movable headstock structure has a through-hole for the drill rod to pass through, and the through-hole for the drill rod to pass through is coaxially arranged with the through cavity of the centering movable cylinder.

[0012] Preferably, a centering observation head structure is elastically and telescopically provided above the movable telescopic sleeve; The bottom end of the centering observation head structure is connected to an inner limiting movable sleeve; The centering observation head structure is connected to the inner limiting movable sleeve and has a channel opening for the drill pipe to pass through; The inner limiting movable sleeve is positioned at one end near the movable telescopic sleeve and is movably placed within the movable telescopic sleeve. The outer wall of the inner limiting movable sleeve is in movable limiting contact with the inner wall of the movable telescopic sleeve.

[0013] Preferably, a telescopic spring is fitted on the outer wall of the movable telescopic sleeve; One end of the telescopic spring is used to connect to the centering connector, and the other end of the telescopic spring is used to connect to the centering observation head structure.

[0014] Preferably, the telescopic spring is provided with several movable connection structures around its outer perimeter; The movable connection structure includes a telescopic movable cylinder; The bottom end of the telescopic cylinder is hinged to the centering connector via a hinged seat. The top of the telescopic cylinder is connected to a telescopic ball seat structure, and a side connecting rod is connected to the telescopic ball seat structure by a ball joint. The other end of the side connecting rod is used to connect to the top side wall of the centering observation head structure.

[0015] Preferably, several horizontal sensors are installed and connected around the centering observation head structure; Several horizontal circular tube bubble gauges are installed and connected around the top of the centering observation head structure.

[0016] The beneficial effects of this invention are as follows: The purpose of this invention is to provide a drilling guide device for bridge foundation soil layer construction. This guide device is used to position the layout line placed in the pile foundation hole for drilling in the bridge foundation soil layer, and to guide and position the drill rod of the pile driver drilling in the soil (rock) layer; through this guide device: 1. It can guide and position the drill rod of the piling machine to ensure the verticality of the drill rod during the drilling process, thereby ensuring the quality of the drilling; 2. It can adapt to pile driver drill rods of different diameters, further ensuring the applicability range of the device; and the device can be used multiple times, thereby saving construction costs. 3. It can promptly remind construction personnel whether the drilling is tilted during the drilling process, so that construction personnel can make timely corrections and adjustments, reducing the quality problems of the drilled hole caused by the verticality error during the drilling process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 2 This is an exploded schematic diagram of the connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 3This is a schematic diagram of the centering mechanism connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 4 This is an exploded schematic diagram of the centering mechanism connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention. Figure 5 This is a schematic diagram of the centering rotating chassis connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 6 This is an exploded schematic diagram of the centering rotating chassis connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention. Figure 7 This is a schematic diagram of the connection structure of the centering movable component of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 8 This is an exploded view of the connecting structure of the centering movable component of a drilling guide device for bridge foundation soil layer construction according to the present invention. Figure 9 This is a schematic diagram of the movable telescopic sleeve connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention; Figure 10 This is an exploded schematic diagram of the movable telescopic sleeve connection structure of a drilling guide device for bridge foundation soil layer construction according to the present invention. In the diagram, 1-drill pipe guide base, 2-centering cylinder, 3-centering rotating chassis, 4-centering movable cylinder, 31-movable guide sleeve, 32-rotating connecting cylinder, 33-centering movable seat, 41-centering connector, 42-movable telescopic sleeve, 43-centering observation head structure, 44-telescopic movable cylinder, 321-rotational adjustment drive gear, 322-drive pinion, 323-rotational control servo motor, 331-centering movable slider, 332-centering movable limit block, 333-centering movable gripper, 421-centering movable head structure, 431-inner limit movable sleeve, 432-telescopic spring, 433-level sensor, 434-level circular tube bubble meter, 441-telescopic movable ball seat structure, 442-side connecting rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 10 As shown, a drilling guide device for bridge foundation soil layer construction is used to position the pile foundation hole to be drilled in the soil layer of the bridge foundation. The device guides and positions the drill rod of the pile driver drilling in the soil layer (rock layer) to ensure the quality of the drilling (especially the quality of verticality).

[0020] The guiding device includes a drill rod guide base 1, which has a through-hole for guiding and receiving. A centering cylinder 2 for guiding the drill rod is installed and connected in the guiding and receiving cavity. A centering mechanism for centering and guiding the drill rod is installed and connected on the centering cylinder 2. The drill rod guide base 1 of the guiding device is placed at the layout position of the pile hole drilled in the soil layer of the bridge foundation, and adjusted to make the guiding device horizontal. The guiding device is then "anchored and fixed". Then the drill rod of the pile driver is allowed to pass through the guiding device, and the centering mechanism of the guiding device guides and positions it.

[0021] The centering mechanism includes a centering rotating base 3; the centering rotating base 3 is rotatably mounted on a through-hole movable guide sleeve 31 via bearings; the centering rotating base 3 and the movable guide sleeve 31 are connected through each other, and the movable guide sleeve 31 is used to connect to the centering cylinder 2 and is coaxially arranged with the centering cylinder 2 for the drill rod to pass through; a rotating connecting cylinder 32 is connected to the bottom end of the centering rotating base 3, and the rotating connecting cylinder 32 is rotatably mounted on the outer wall of the movable guide sleeve 31, and the bottom end of the rotating connecting cylinder 32 is used to connect to a rotating adjustment structure; and the rotating adjustment structure is used to install and connect with the centering cylinder; the rotating adjustment structure drives the rotating connecting cylinder 32 to rotate around the outer wall of the movable guide sleeve 31, and the rotating connecting cylinder 32 drives the centering rotating base 3 to rotate.

[0022] Furthermore, such as Figures 3 to 8 As shown, a centering movable seat 33 is installed and connected to the top of the centering rotating chassis 3, and several centering movable components are installed and connected on the centering movable seat 33. A through-type centering movable cylinder 4 is installed and connected to the top of the centering movable seat 33, and the several centering movable components are movably disposed in the centering movable cylinder 4. The centering movable seat 33 has a movable channel for the drill rod to pass through, and the centering movable cylinder 4 and the movable channel for the drill rod to pass through the centering movable seat 33 are coaxially arranged. The movable channel for the drill rod to pass through the centering movable seat 33 is coaxially arranged with the rotating connecting cylinder 32. When the drill rod of the piling machine passes through this guiding device, by adjusting the rotation of the centering rotating chassis 3, the several centering movable components "movably connected" on the centering movable seat 33 are driven to move "synchronously relative" to each other, thereby realizing the positioning and guidance of the drill rod passing between the several centering movable components. Furthermore, since the several centering movable components are relatively movable, it is possible to position and guide drill rods of different diameters.

[0023] Meanwhile, the bottom end of the rotating connecting cylinder 32 is connected to the rotating adjustment drive gear 321, which is rotatably connected to the centering cylinder 4 via a bearing. The rotating adjustment drive gear 321 is rotatably disposed in the guide receiving cavity through which the drill pipe guide base 1 is opened. The rotating adjustment drive gear 321 is engaged with the drive pinion 322, which is connected to a drive shaft. The other end of the drive shaft rotates and passes through the connecting disc, and its end is used to connect to the output end of the rotating control servo motor 323. The connecting disc is used to connect to the centering cylinder 4, and the rotating control servo motor 323 is used to be installed and fixed in the guide receiving cavity through which the drill pipe guide base 1 is opened. The design is as follows: By controlling the rotational movement (including forward and reverse rotation) of the rotary control servo motor 323, which is set in the guide cavity through the drill pipe guide base 1, the rotary control servo motor 323 drives the drive pinion 322 to rotate via the drive shaft; the drive pinion 322 drives the rotary adjustment drive gear 321, which meshes with it, to rotate; the rotary adjustment drive gear 321 drives the rotary connecting cylinder 32 to rotate; thereby realizing the rotational movement of the centering rotary chassis 3 (under the drive of the rotary control servo motor 323, the centering rotary chassis 3 rotates forward and reverse relative to the centering cylinder 2).

[0024] The rotating connecting cylinder 32 passes through the centering rotating base 3 via a bearing and is used to connect with the centering movable seat 33. The centering movable seat 33 has a centering movable groove corresponding to a plurality of centering movable parts, and the centering movable parts are set to be movable and limited by the centering movable groove and the centering movable seat 33. The centering movable component includes a centering movable slider 331; the centering movable slider 331 is adapted to slide and limit the centering movable groove; the bottom end of the centering movable groove is provided with a centering movable channel opening; the bottom end of the centering movable slider 331 and the end of the movable channel for the drill rod to pass through, which is opened away from the centering movable seat 33, is rotatably connected to a centering movable limit block 332 by a rotating pin, the centering movable limit block 332 is used to move through the centering movable channel opening opened at the bottom end of the centering movable groove; the top end of the centering rotating chassis 3 is provided with a centering sliding limit groove that is arc-shaped and corresponds to the centering movable limit block 332, the centering movable limit block 332 is placed in the centering sliding limit groove and can be limited to move along the centering sliding limit groove. Furthermore, a centering movable slider 331 is connected to a centering movable jaw 333 at one end near the movable channel for drill pipe passage opened in the centering movable seat 33. The centering movable jaw 33 is movably disposed in the centering movable cylinder 4. Centering movable guide rails are connected to both sides of the top of the centering movable slider 331. The centering movable slider 331 is connected to the top of the centering movable groove opened in the centering movable seat 33 via the centering movable guide rails for sliding limit guidance connection. By adjusting and controlling the rotation of the centering rotating base 3, the centering movable limit block 332 rotates with the centering rotating base 3 and moves along the centering sliding limit groove; thereby driving the centering movable slider 331 to move along the centering movable groove, realizing the relative movement of the centering movable jaw 333.

[0025] In this embodiment, a centering mechanism, similar to an "iris mechanism," is used. Specifically, by controlling the rotational movement of the rotary control servo motor 323, the centering rotating chassis 3 rotates. The centering rotating chassis 3 then moves several centering movable sliders 331, which in turn move the centering movable grippers 333 mounted on them synchronously (or, alternatively, guide plate structures for guiding and limiting drill rods). This achieves the purpose of positioning and guiding drill rods of different diameters.

[0026] Furthermore, such as Figure 9 , Figure 10As shown, the top end of the centering movable cylinder 4 is connected to a centering connector 41; the top end of the centering connector 41 is connected to a movable telescopic sleeve 42, which is through-hole set and used for the drill rod to pass through, through a movable mechanism; the movable telescopic sleeve 42 is used to be through-hole set with the centering connector 41 and used for the drill rod to pass through. The movable telescopic sleeve 42 is connected to a centering movable head structure 421 at one end near the centering connector 41. The centering movable head structure 421 has a movable channel, which is coaxially arranged with the movable telescopic sleeve 42 for the drill rod to pass through. A centering movable head seat structure is connected to the through cavity at one end of the centering connector 41 near the centering movable head structure 421. The centering movable head structure 421 and the centering movable head seat structure are connected by a ball joint for movable limit. The centering movable head seat structure has a through channel for the drill rod to pass through, which is coaxially arranged with the through cavity of the centering movable cylinder 4. By connecting the centering movable cylinder 4 and the movable telescopic sleeve 42 with a "ball joint flexible movable" connection, damage to the drilling system caused by rigid contact when the drill rod tilts during drilling is avoided.

[0027] Meanwhile, above the movable telescopic sleeve 42, a centering observation head structure 43 is elastically and telescopically mounted; the bottom end of the centering observation head structure 43 is connected to an inner limiting movable sleeve 431; the centering observation head structure 43 and the inner limiting movable sleeve 431 are connected to form a channel for the drill pipe to pass through; one end of the inner limiting movable sleeve 431 near the movable telescopic sleeve 42 is movably placed in the movable telescopic sleeve 42, and the outer wall of the inner limiting movable sleeve 431 is in movable limiting contact with the inner wall of the movable telescopic sleeve 42. A telescopic spring 432 is fitted on the outer wall of the movable telescopic sleeve 431; one end of the telescopic spring 432 is connected to the centering connector 41, and the other end of the telescopic spring 432 is connected to the centering observation head structure 43. Furthermore, several movable connection structures are provided around the outer periphery of the telescopic spring 432; the movable connection structures include telescopic movable cylinders 44; the bottom end of the telescopic movable cylinder 44 is hinged to the centering connector 41 via a hinge seat; the top end of the telescopic movable cylinder 44 is connected to a telescopic movable ball seat structure 441, and a side connecting rod 442 is ball-hinged to the telescopic movable ball seat structure 441, the other end of which is connected to the top side wall of the centering observation head structure 43.

[0028] In this embodiment, by controlling and adjusting the telescopic movement of the telescopic cylinder 44, the centering observation head structure 43, which is connected by a ball joint, is driven to move elastically a certain distance under the flexible movement and guiding action of the telescopic sleeve 42, so that the centering observation head structure 43 moves a certain distance; thus, it is convenient to adapt to "flexible limiting" of drill pipes of different diameters. Furthermore, several horizontal sensors 433 are installed and connected around the centering observation head structure 43; several horizontal circular tube bubble gauges 434 are installed and connected around the top of the centering observation head structure 43. Thus, when the drill rod of the piling machine tilts or deviates during drilling, and the "offset end face" abuts against the centering observation head structure 43, the horizontal sensors 433 on that side of the centering observation head structure 43 provide feedback and, through an existing alarm system, alert the construction personnel that the drill rod at this position has tilted. Based on the alert, the construction personnel repeatedly lift the drill rod and finely adjust its vertical direction. Then, the drill rod is passed through the device and drilling continues. When the alarm system stops alerting during drilling, it indicates that the drilling direction is consistent with the initial drilling, meaning the adjustment is within the allowable verticality error range. This effectively avoids the influence of verticality during drilling, thereby ensuring the verticality requirements of the drilled hole.

[0029] It should also be noted that this guiding device can not only be used to lay out the pile foundation hole in the soil layer of the bridge foundation, but also, with appropriate modifications, the drill rod guide base 1 of the guiding device can be placed on the vertical guide rail of the pile driver and used in conjunction with the pile driver to achieve the same guiding and positioning of the drill rod.

Claims

1. A drilling guide device for bridge foundation soil layer construction, comprising a drill rod guide base, characterized in that, The drill pipe guide base has a through-hole for a guide cavity, and a centering cylinder for guiding the drill pipe is installed in the guide cavity. A centering mechanism for centering and guiding the drill pipe is installed on the centering cylinder. The centering mechanism includes a centering rotating chassis; The centering rotating chassis is mounted on a through-hole movable guide sleeve via a bearing for rotational installation; The centering rotating chassis is connected to the movable guide sleeve, and the movable guide sleeve is used to connect to the centering cylinder and is coaxial with the centering cylinder for the drill pipe to pass through; The bottom end of the centering rotating chassis is connected to a rotating connecting cylinder, which is rotatably fitted onto the outer wall of the movable guide sleeve. The bottom end of the rotating connecting cylinder is used to connect with the rotating adjustment structure. The rotary adjustment structure is used for installation and connection with the centering cylinder; A centering movable seat is installed and connected to the top of the centering rotating chassis, and a plurality of centering movable components are installed and connected on the centering movable seat; The top of the centering movable seat is connected to a through-hole centering movable cylinder, and several centering movable parts are movably disposed in the centering movable cylinder; The centering movable seat has a movable channel for the drill rod to pass through, and the centering movable cylinder is coaxially arranged with the movable channel for the drill rod to pass through the centering movable seat; The movable channel for the drill pipe to pass through the centering movable seat is coaxially arranged with the rotating connecting cylinder.

2. The drilling guide device for bridge foundation soil layer construction according to claim 1, characterized in that, The rotating connecting cylinder passes through the centering rotating chassis via a bearing and is used to connect with the centering movable seat; The centering movable seat is provided with centering movable slots corresponding to a plurality of centering movable components, and the centering movable components are configured to be movable and limited with the centering movable seat through the centering movable slots; The bottom end of the rotating connecting cylinder is connected to the large rotating adjustment drive gear, which is rotatably connected to the centering cylinder via a bearing. The rotary adjustment drive gear is installed in the guide receiving cavity through which the drill pipe guide base is opened; The large rotating adjustment drive gear meshes with the small driving gear, the small driving gear is connected to the drive shaft, and the other end of the drive shaft rotates through the connecting disc and is used to connect to the output end of the rotating control servo motor. The connecting disc is used to connect with the centering cylinder, and the rotation control servo is used to install and fix in the guide receiving cavity that is opened through the drill pipe guide base.

3. The drilling guide device for bridge foundation soil layer construction according to claim 2, characterized in that, The centering movable component includes a centering movable slider; The centering movable slider and the centering movable groove are adapted to slide limit; The bottom end of the centering movable groove is provided with a centering movable channel opening; The bottom end of the centering movable slider and the end of the movable channel for the drill rod to pass through, which is opened away from the centering movable seat, is rotatably connected to a centering movable limiting block by a rotating pin. The centering movable limiting block is used to move through the centering movable channel opening opened through the bottom end of the centering movable groove. The top of the centering rotating chassis is provided with a centering sliding limiting groove that is arc-shaped and corresponds to the centering movable limiting block. The centering movable limiting block is placed in the centering sliding limiting groove and can move along the centering sliding limiting groove.

4. The drilling guide device for bridge foundation soil layer construction according to claim 3, characterized in that, The centering movable slider is connected to a centering movable jaw at one end near the movable channel for the drill rod to pass through, and the centering movable jaw is movably disposed in the centering movable cylinder. The top two sides of the centering movable slider are respectively connected to the centering movable guide rails, and the centering movable slider is used to slide and limit the connection with the top of the centering movable slot opened in the centering movable seat through the centering movable guide rails.

5. A drilling guide device for bridge foundation soil layer construction according to claim 1, characterized in that, The top end of the centering movable cylinder is connected to a centering connector; The top of the centering connector is used to connect with a through-hole telescopic sleeve through which the drill pipe passes via a movable mechanism. The movable telescopic sleeve is configured to communicate with the centering connector for the drill pipe to pass through.

6. A drilling guide device for bridge foundation soil layer construction according to claim 5, characterized in that, The movable telescopic sleeve is connected to a centering movable head structure at one end near the centering connector. The centering movable head structure has a movable channel, and the movable channel of the centering movable head structure is coaxially arranged with the movable telescopic sleeve for the drill pipe to pass through; The centering connector has a centering movable head seat structure connected in the through cavity at one end near the centering movable head structure. The centering movable head structure and the centering movable head seat structure are connected by a ball joint for movable limiting. The centering movable headstock structure has a through-hole for the drill rod to pass through, and the through-hole for the drill rod to pass through is coaxially arranged with the through cavity of the centering movable cylinder.

7. A drilling guide device for bridge foundation soil layer construction according to claim 6, characterized in that, Above the movable telescopic sleeve, a centering observation head structure is flexibly and telescopically provided; The bottom end of the centering observation head structure is connected to an inner limiting movable sleeve; The centering observation head structure is connected to the inner limiting movable sleeve and has a channel opening for the drill pipe to pass through; The inner limiting movable sleeve is positioned at one end near the movable telescopic sleeve and is movably placed within the movable telescopic sleeve. The outer wall of the inner limiting movable sleeve is in movable limiting contact with the inner wall of the movable telescopic sleeve.

8. A drilling guide device for bridge foundation soil layer construction according to claim 7, characterized in that, The outer wall of the movable telescopic sleeve is fitted with a telescopic spring; One end of the telescopic spring is used to connect to the centering connector, and the other end of the telescopic spring is used to connect to the centering observation head structure.

9. A drilling guide device for bridge foundation soil layer construction according to claim 8, characterized in that, The telescopic spring is provided with several movable connection structures around its outer perimeter. The movable connection structure includes a telescopic movable cylinder; The bottom end of the telescopic cylinder is hinged to the centering connector via a hinged seat. The top of the telescopic cylinder is connected to a telescopic ball seat structure, and a side connecting rod is connected to the telescopic ball seat structure by a ball joint. The other end of the side connecting rod is used to connect to the top side wall of the centering observation head structure.

10. A drilling guide device for bridge foundation soil layer construction according to claim 9, characterized in that, Several horizontal sensors are installed and connected around the centering observation head structure. Several horizontal circular tube bubble gauges are installed and connected around the top of the centering observation head structure.

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